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ruby--ruby/gc.c
Jeremy Evans ffd0820ab3 Deprecate taint/trust and related methods, and make the methods no-ops 
This removes the related tests, and puts the related specs behind
version guards.  This affects all code in lib, including some
libraries that may want to support older versions of Ruby.
2019-11-18 01:00:25 +02:00

11979 lines
320 KiB
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/**********************************************************************
gc.c -
$Author$
created at: Tue Oct 5 09:44:46 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#define rb_data_object_alloc rb_data_object_alloc
#define rb_data_typed_object_alloc rb_data_typed_object_alloc
#include "ruby/encoding.h"
#include "ruby/io.h"
#include "ruby/st.h"
#include "ruby/re.h"
#include "ruby/thread.h"
#include "ruby/util.h"
#include "ruby/debug.h"
#include "internal.h"
#include "eval_intern.h"
#include "vm_core.h"
#include "builtin.h"
#include "gc.h"
#include "constant.h"
#include "ruby_atomic.h"
#include "probes.h"
#include "id_table.h"
#include "symbol.h"
#include <stdio.h>
#include <stdarg.h>
#include <setjmp.h>
#include <sys/types.h>
#include "ruby_assert.h"
#include "debug_counter.h"
#include "transient_heap.h"
#include "mjit.h"
#undef rb_data_object_wrap
#ifndef HAVE_MALLOC_USABLE_SIZE
# ifdef _WIN32
# define HAVE_MALLOC_USABLE_SIZE
# define malloc_usable_size(a) _msize(a)
# elif defined HAVE_MALLOC_SIZE
# define HAVE_MALLOC_USABLE_SIZE
# define malloc_usable_size(a) malloc_size(a)
# endif
#endif
#ifdef HAVE_MALLOC_USABLE_SIZE
# ifdef RUBY_ALTERNATIVE_MALLOC_HEADER
# include RUBY_ALTERNATIVE_MALLOC_HEADER
# elif HAVE_MALLOC_H
# include <malloc.h>
# elif defined(HAVE_MALLOC_NP_H)
# include <malloc_np.h>
# elif defined(HAVE_MALLOC_MALLOC_H)
# include <malloc/malloc.h>
# endif
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#if defined _WIN32 || defined __CYGWIN__
#include <windows.h>
#elif defined(HAVE_POSIX_MEMALIGN)
#elif defined(HAVE_MEMALIGN)
#include <malloc.h>
#endif
#define rb_setjmp(env) RUBY_SETJMP(env)
#define rb_jmp_buf rb_jmpbuf_t
#if defined(_MSC_VER) && defined(_WIN64)
#include <intrin.h>
#pragma intrinsic(_umul128)
#endif
/* Expecting this struct to be elminated by function inlinings */
struct optional {
bool left;
size_t right;
};
static inline struct optional
size_mul_overflow(size_t x, size_t y)
{
bool p;
size_t z;
#if 0
#elif defined(HAVE_BUILTIN___BUILTIN_MUL_OVERFLOW)
p = __builtin_mul_overflow(x, y, &z);
#elif defined(DSIZE_T)
RB_GNUC_EXTENSION DSIZE_T dx = x;
RB_GNUC_EXTENSION DSIZE_T dy = y;
RB_GNUC_EXTENSION DSIZE_T dz = dx * dy;
p = dz > SIZE_MAX;
z = (size_t)dz;
#elif defined(_MSC_VER) && defined(_WIN64)
unsigned __int64 dp;
unsigned __int64 dz = _umul128(x, y, &dp);
p = (bool)dp;
z = (size_t)dz;
#else
/* https://wiki.sei.cmu.edu/confluence/display/c/INT30-C.+Ensure+that+unsigned+integer+operations+do+not+wrap */
p = (y != 0) && (x > SIZE_MAX / y);
z = x * y;
#endif
return (struct optional) { p, z, };
}
static inline struct optional
size_add_overflow(size_t x, size_t y)
{
size_t z;
bool p;
#if 0
#elif defined(HAVE_BUILTIN___BUILTIN_ADD_OVERFLOW)
p = __builtin_add_overflow(x, y, &z);
#elif defined(DSIZE_T)
RB_GNUC_EXTENSION DSIZE_T dx = x;
RB_GNUC_EXTENSION DSIZE_T dy = y;
RB_GNUC_EXTENSION DSIZE_T dz = dx + dy;
p = dz > SIZE_MAX;
z = (size_t)dz;
#else
z = x + y;
p = z < y;
#endif
return (struct optional) { p, z, };
}
static inline struct optional
size_mul_add_overflow(size_t x, size_t y, size_t z) /* x * y + z */
{
struct optional t = size_mul_overflow(x, y);
struct optional u = size_add_overflow(t.right, z);
return (struct optional) { t.left || u.left, u.right };
}
static inline struct optional
size_mul_add_mul_overflow(size_t x, size_t y, size_t z, size_t w) /* x * y + z * w */
{
struct optional t = size_mul_overflow(x, y);
struct optional u = size_mul_overflow(z, w);
struct optional v = size_add_overflow(t.right, u.right);
return (struct optional) { t.left || u.left || v.left, v.right };
}
PRINTF_ARGS(NORETURN(static void gc_raise(VALUE, const char*, ...)), 2, 3);
static inline size_t
size_mul_or_raise(size_t x, size_t y, VALUE exc)
{
struct optional t = size_mul_overflow(x, y);
if (LIKELY(!t.left)) {
return t.right;
}
else if (rb_during_gc()) {
rb_memerror(); /* or...? */
}
else {
gc_raise(
exc,
"integer overflow: %"PRIuSIZE
" * %"PRIuSIZE
" > %"PRIuSIZE,
x, y, SIZE_MAX);
}
}
size_t
rb_size_mul_or_raise(size_t x, size_t y, VALUE exc)
{
return size_mul_or_raise(x, y, exc);
}
static inline size_t
size_mul_add_or_raise(size_t x, size_t y, size_t z, VALUE exc)
{
struct optional t = size_mul_add_overflow(x, y, z);
if (LIKELY(!t.left)) {
return t.right;
}
else if (rb_during_gc()) {
rb_memerror(); /* or...? */
}
else {
gc_raise(
exc,
"integer overflow: %"PRIuSIZE
" * %"PRIuSIZE
" + %"PRIuSIZE
" > %"PRIuSIZE,
x, y, z, SIZE_MAX);
}
}
size_t
rb_size_mul_add_or_raise(size_t x, size_t y, size_t z, VALUE exc)
{
return size_mul_add_or_raise(x, y, z, exc);
}
static inline size_t
size_mul_add_mul_or_raise(size_t x, size_t y, size_t z, size_t w, VALUE exc)
{
struct optional t = size_mul_add_mul_overflow(x, y, z, w);
if (LIKELY(!t.left)) {
return t.right;
}
else if (rb_during_gc()) {
rb_memerror(); /* or...? */
}
else {
gc_raise(
exc,
"integer overflow: %"PRIdSIZE
" * %"PRIdSIZE
" + %"PRIdSIZE
" * %"PRIdSIZE
" > %"PRIdSIZE,
x, y, z, w, SIZE_MAX);
}
}
#if defined(HAVE_RB_GC_GUARDED_PTR_VAL) && HAVE_RB_GC_GUARDED_PTR_VAL
/* trick the compiler into thinking a external signal handler uses this */
volatile VALUE rb_gc_guarded_val;
volatile VALUE *
rb_gc_guarded_ptr_val(volatile VALUE *ptr, VALUE val)
{
rb_gc_guarded_val = val;
return ptr;
}
#endif
#ifndef GC_HEAP_INIT_SLOTS
#define GC_HEAP_INIT_SLOTS 10000
#endif
#ifndef GC_HEAP_FREE_SLOTS
#define GC_HEAP_FREE_SLOTS 4096
#endif
#ifndef GC_HEAP_GROWTH_FACTOR
#define GC_HEAP_GROWTH_FACTOR 1.8
#endif
#ifndef GC_HEAP_GROWTH_MAX_SLOTS
#define GC_HEAP_GROWTH_MAX_SLOTS 0 /* 0 is disable */
#endif
#ifndef GC_HEAP_OLDOBJECT_LIMIT_FACTOR
#define GC_HEAP_OLDOBJECT_LIMIT_FACTOR 2.0
#endif
#ifndef GC_HEAP_FREE_SLOTS_MIN_RATIO
#define GC_HEAP_FREE_SLOTS_MIN_RATIO 0.20
#endif
#ifndef GC_HEAP_FREE_SLOTS_GOAL_RATIO
#define GC_HEAP_FREE_SLOTS_GOAL_RATIO 0.40
#endif
#ifndef GC_HEAP_FREE_SLOTS_MAX_RATIO
#define GC_HEAP_FREE_SLOTS_MAX_RATIO 0.65
#endif
#ifndef GC_MALLOC_LIMIT_MIN
#define GC_MALLOC_LIMIT_MIN (16 * 1024 * 1024 /* 16MB */)
#endif
#ifndef GC_MALLOC_LIMIT_MAX
#define GC_MALLOC_LIMIT_MAX (32 * 1024 * 1024 /* 32MB */)
#endif
#ifndef GC_MALLOC_LIMIT_GROWTH_FACTOR
#define GC_MALLOC_LIMIT_GROWTH_FACTOR 1.4
#endif
#ifndef GC_OLDMALLOC_LIMIT_MIN
#define GC_OLDMALLOC_LIMIT_MIN (16 * 1024 * 1024 /* 16MB */)
#endif
#ifndef GC_OLDMALLOC_LIMIT_GROWTH_FACTOR
#define GC_OLDMALLOC_LIMIT_GROWTH_FACTOR 1.2
#endif
#ifndef GC_OLDMALLOC_LIMIT_MAX
#define GC_OLDMALLOC_LIMIT_MAX (128 * 1024 * 1024 /* 128MB */)
#endif
#ifndef PRINT_MEASURE_LINE
#define PRINT_MEASURE_LINE 0
#endif
#ifndef PRINT_ENTER_EXIT_TICK
#define PRINT_ENTER_EXIT_TICK 0
#endif
#ifndef PRINT_ROOT_TICKS
#define PRINT_ROOT_TICKS 0
#endif
#define USE_TICK_T (PRINT_ENTER_EXIT_TICK || PRINT_MEASURE_LINE || PRINT_ROOT_TICKS)
#define TICK_TYPE 1
typedef struct {
size_t heap_init_slots;
size_t heap_free_slots;
double growth_factor;
size_t growth_max_slots;
double heap_free_slots_min_ratio;
double heap_free_slots_goal_ratio;
double heap_free_slots_max_ratio;
double oldobject_limit_factor;
size_t malloc_limit_min;
size_t malloc_limit_max;
double malloc_limit_growth_factor;
size_t oldmalloc_limit_min;
size_t oldmalloc_limit_max;
double oldmalloc_limit_growth_factor;
VALUE gc_stress;
} ruby_gc_params_t;
static ruby_gc_params_t gc_params = {
GC_HEAP_INIT_SLOTS,
GC_HEAP_FREE_SLOTS,
GC_HEAP_GROWTH_FACTOR,
GC_HEAP_GROWTH_MAX_SLOTS,
GC_HEAP_FREE_SLOTS_MIN_RATIO,
GC_HEAP_FREE_SLOTS_GOAL_RATIO,
GC_HEAP_FREE_SLOTS_MAX_RATIO,
GC_HEAP_OLDOBJECT_LIMIT_FACTOR,
GC_MALLOC_LIMIT_MIN,
GC_MALLOC_LIMIT_MAX,
GC_MALLOC_LIMIT_GROWTH_FACTOR,
GC_OLDMALLOC_LIMIT_MIN,
GC_OLDMALLOC_LIMIT_MAX,
GC_OLDMALLOC_LIMIT_GROWTH_FACTOR,
FALSE,
};
/* GC_DEBUG:
* enable to embed GC debugging information.
*/
#ifndef GC_DEBUG
#define GC_DEBUG 0
#endif
#if USE_RGENGC
/* RGENGC_DEBUG:
* 1: basic information
* 2: remember set operation
* 3: mark
* 4:
* 5: sweep
*/
#ifndef RGENGC_DEBUG
#ifdef RUBY_DEVEL
#define RGENGC_DEBUG -1
#else
#define RGENGC_DEBUG 0
#endif
#endif
#if RGENGC_DEBUG < 0 && !defined(_MSC_VER)
# define RGENGC_DEBUG_ENABLED(level) (-(RGENGC_DEBUG) >= (level) && ruby_rgengc_debug >= (level))
#else
# define RGENGC_DEBUG_ENABLED(level) ((RGENGC_DEBUG) >= (level))
#endif
int ruby_rgengc_debug;
/* RGENGC_CHECK_MODE
* 0: disable all assertions
* 1: enable assertions (to debug RGenGC)
* 2: enable internal consistency check at each GC (for debugging)
* 3: enable internal consistency check at each GC steps (for debugging)
* 4: enable liveness check
* 5: show all references
*/
#ifndef RGENGC_CHECK_MODE
#define RGENGC_CHECK_MODE 0
#endif
// Note: using RUBY_ASSERT_WHEN() extend a macro in expr (info by nobu).
#define GC_ASSERT(expr) RUBY_ASSERT_MESG_WHEN(RGENGC_CHECK_MODE > 0, expr, #expr)
/* RGENGC_OLD_NEWOBJ_CHECK
* 0: disable all assertions
* >0: make a OLD object when new object creation.
*
* Make one OLD object per RGENGC_OLD_NEWOBJ_CHECK WB protected objects creation.
*/
#ifndef RGENGC_OLD_NEWOBJ_CHECK
#define RGENGC_OLD_NEWOBJ_CHECK 0
#endif
/* RGENGC_PROFILE
* 0: disable RGenGC profiling
* 1: enable profiling for basic information
* 2: enable profiling for each types
*/
#ifndef RGENGC_PROFILE
#define RGENGC_PROFILE 0
#endif
/* RGENGC_ESTIMATE_OLDMALLOC
* Enable/disable to estimate increase size of malloc'ed size by old objects.
* If estimation exceeds threshold, then will invoke full GC.
* 0: disable estimation.
* 1: enable estimation.
*/
#ifndef RGENGC_ESTIMATE_OLDMALLOC
#define RGENGC_ESTIMATE_OLDMALLOC 1
#endif
/* RGENGC_FORCE_MAJOR_GC
* Force major/full GC if this macro is not 0.
*/
#ifndef RGENGC_FORCE_MAJOR_GC
#define RGENGC_FORCE_MAJOR_GC 0
#endif
#else /* USE_RGENGC */
#ifdef RGENGC_DEBUG
#undef RGENGC_DEBUG
#endif
#define RGENGC_DEBUG 0
#ifdef RGENGC_CHECK_MODE
#undef RGENGC_CHECK_MODE
#endif
#define RGENGC_CHECK_MODE 0
#define RGENGC_PROFILE 0
#define RGENGC_ESTIMATE_OLDMALLOC 0
#define RGENGC_FORCE_MAJOR_GC 0
#endif /* USE_RGENGC */
#ifndef GC_PROFILE_MORE_DETAIL
#define GC_PROFILE_MORE_DETAIL 0
#endif
#ifndef GC_PROFILE_DETAIL_MEMORY
#define GC_PROFILE_DETAIL_MEMORY 0
#endif
#ifndef GC_ENABLE_INCREMENTAL_MARK
#define GC_ENABLE_INCREMENTAL_MARK USE_RINCGC
#endif
#ifndef GC_ENABLE_LAZY_SWEEP
#define GC_ENABLE_LAZY_SWEEP 1
#endif
#ifndef CALC_EXACT_MALLOC_SIZE
#define CALC_EXACT_MALLOC_SIZE USE_GC_MALLOC_OBJ_INFO_DETAILS
#endif
#if defined(HAVE_MALLOC_USABLE_SIZE) || CALC_EXACT_MALLOC_SIZE > 0
#ifndef MALLOC_ALLOCATED_SIZE
#define MALLOC_ALLOCATED_SIZE 0
#endif
#else
#define MALLOC_ALLOCATED_SIZE 0
#endif
#ifndef MALLOC_ALLOCATED_SIZE_CHECK
#define MALLOC_ALLOCATED_SIZE_CHECK 0
#endif
#ifndef GC_DEBUG_STRESS_TO_CLASS
#define GC_DEBUG_STRESS_TO_CLASS 0
#endif
#ifndef RGENGC_OBJ_INFO
#define RGENGC_OBJ_INFO (RGENGC_DEBUG | RGENGC_CHECK_MODE)
#endif
typedef enum {
GPR_FLAG_NONE = 0x000,
/* major reason */
GPR_FLAG_MAJOR_BY_NOFREE = 0x001,
GPR_FLAG_MAJOR_BY_OLDGEN = 0x002,
GPR_FLAG_MAJOR_BY_SHADY = 0x004,
GPR_FLAG_MAJOR_BY_FORCE = 0x008,
#if RGENGC_ESTIMATE_OLDMALLOC
GPR_FLAG_MAJOR_BY_OLDMALLOC = 0x020,
#endif
GPR_FLAG_MAJOR_MASK = 0x0ff,
/* gc reason */
GPR_FLAG_NEWOBJ = 0x100,
GPR_FLAG_MALLOC = 0x200,
GPR_FLAG_METHOD = 0x400,
GPR_FLAG_CAPI = 0x800,
GPR_FLAG_STRESS = 0x1000,
/* others */
GPR_FLAG_IMMEDIATE_SWEEP = 0x2000,
GPR_FLAG_HAVE_FINALIZE = 0x4000,
GPR_FLAG_IMMEDIATE_MARK = 0x8000,
GPR_FLAG_FULL_MARK = 0x10000,
GPR_DEFAULT_REASON =
(GPR_FLAG_FULL_MARK | GPR_FLAG_IMMEDIATE_MARK |
GPR_FLAG_IMMEDIATE_SWEEP | GPR_FLAG_CAPI),
} gc_profile_record_flag;
typedef struct gc_profile_record {
int flags;
double gc_time;
double gc_invoke_time;
size_t heap_total_objects;
size_t heap_use_size;
size_t heap_total_size;
#if GC_PROFILE_MORE_DETAIL
double gc_mark_time;
double gc_sweep_time;
size_t heap_use_pages;
size_t heap_live_objects;
size_t heap_free_objects;
size_t allocate_increase;
size_t allocate_limit;
double prepare_time;
size_t removing_objects;
size_t empty_objects;
#if GC_PROFILE_DETAIL_MEMORY
long maxrss;
long minflt;
long majflt;
#endif
#endif
#if MALLOC_ALLOCATED_SIZE
size_t allocated_size;
#endif
#if RGENGC_PROFILE > 0
size_t old_objects;
size_t remembered_normal_objects;
size_t remembered_shady_objects;
#endif
} gc_profile_record;
#if defined(_MSC_VER) || defined(__CYGWIN__)
#pragma pack(push, 1) /* magic for reducing sizeof(RVALUE): 24 -> 20 */
#endif
typedef struct RVALUE {
union {
struct {
VALUE flags; /* always 0 for freed obj */
struct RVALUE *next;
} free;
struct RMoved moved;
struct RBasic basic;
struct RObject object;
struct RClass klass;
struct RFloat flonum;
struct RString string;
struct RArray array;
struct RRegexp regexp;
struct RHash hash;
struct RData data;
struct RTypedData typeddata;
struct RStruct rstruct;
struct RBignum bignum;
struct RFile file;
struct RMatch match;
struct RRational rational;
struct RComplex complex;
union {
rb_cref_t cref;
struct vm_svar svar;
struct vm_throw_data throw_data;
struct vm_ifunc ifunc;
struct MEMO memo;
struct rb_method_entry_struct ment;
const rb_iseq_t iseq;
rb_env_t env;
struct rb_imemo_tmpbuf_struct alloc;
rb_ast_t ast;
} imemo;
struct {
struct RBasic basic;
VALUE v1;
VALUE v2;
VALUE v3;
} values;
} as;
#if GC_DEBUG
const char *file;
int line;
#endif
} RVALUE;
#if defined(_MSC_VER) || defined(__CYGWIN__)
#pragma pack(pop)
#endif
typedef uintptr_t bits_t;
enum {
BITS_SIZE = sizeof(bits_t),
BITS_BITLENGTH = ( BITS_SIZE * CHAR_BIT )
};
struct heap_page_header {
struct heap_page *page;
};
struct heap_page_body {
struct heap_page_header header;
/* char gap[]; */
/* RVALUE values[]; */
};
struct gc_list {
VALUE *varptr;
struct gc_list *next;
};
#define STACK_CHUNK_SIZE 500
typedef struct stack_chunk {
VALUE data[STACK_CHUNK_SIZE];
struct stack_chunk *next;
} stack_chunk_t;
typedef struct mark_stack {
stack_chunk_t *chunk;
stack_chunk_t *cache;
int index;
int limit;
size_t cache_size;
size_t unused_cache_size;
} mark_stack_t;
typedef struct rb_heap_struct {
RVALUE *freelist;
struct heap_page *free_pages;
struct heap_page *using_page;
struct list_head pages;
struct heap_page *sweeping_page; /* iterator for .pages */
#if GC_ENABLE_INCREMENTAL_MARK
struct heap_page *pooled_pages;
#endif
size_t total_pages; /* total page count in a heap */
size_t total_slots; /* total slot count (about total_pages * HEAP_PAGE_OBJ_LIMIT) */
} rb_heap_t;
enum gc_mode {
gc_mode_none,
gc_mode_marking,
gc_mode_sweeping
};
typedef struct rb_objspace {
struct {
size_t limit;
size_t increase;
#if MALLOC_ALLOCATED_SIZE
size_t allocated_size;
size_t allocations;
#endif
} malloc_params;
struct {
unsigned int mode : 2;
unsigned int immediate_sweep : 1;
unsigned int dont_gc : 1;
unsigned int dont_incremental : 1;
unsigned int during_gc : 1;
unsigned int during_compacting : 1;
unsigned int gc_stressful: 1;
unsigned int has_hook: 1;
#if USE_RGENGC
unsigned int during_minor_gc : 1;
#endif
#if GC_ENABLE_INCREMENTAL_MARK
unsigned int during_incremental_marking : 1;
#endif
} flags;
rb_event_flag_t hook_events;
size_t total_allocated_objects;
VALUE next_object_id;
rb_heap_t eden_heap;
rb_heap_t tomb_heap; /* heap for zombies and ghosts */
struct {
rb_atomic_t finalizing;
} atomic_flags;
struct mark_func_data_struct {
void *data;
void (*mark_func)(VALUE v, void *data);
} *mark_func_data;
mark_stack_t mark_stack;
size_t marked_slots;
struct {
struct heap_page **sorted;
size_t allocated_pages;
size_t allocatable_pages;
size_t sorted_length;
RVALUE *range[2];
size_t freeable_pages;
/* final */
size_t final_slots;
VALUE deferred_final;
} heap_pages;
st_table *finalizer_table;
struct {
int run;
int latest_gc_info;
gc_profile_record *records;
gc_profile_record *current_record;
size_t next_index;
size_t size;
#if GC_PROFILE_MORE_DETAIL
double prepare_time;
#endif
double invoke_time;
#if USE_RGENGC
size_t minor_gc_count;
size_t major_gc_count;
size_t compact_count;
#if RGENGC_PROFILE > 0
size_t total_generated_normal_object_count;
size_t total_generated_shady_object_count;
size_t total_shade_operation_count;
size_t total_promoted_count;
size_t total_remembered_normal_object_count;
size_t total_remembered_shady_object_count;
#if RGENGC_PROFILE >= 2
size_t generated_normal_object_count_types[RUBY_T_MASK];
size_t generated_shady_object_count_types[RUBY_T_MASK];
size_t shade_operation_count_types[RUBY_T_MASK];
size_t promoted_types[RUBY_T_MASK];
size_t remembered_normal_object_count_types[RUBY_T_MASK];
size_t remembered_shady_object_count_types[RUBY_T_MASK];
#endif
#endif /* RGENGC_PROFILE */
#endif /* USE_RGENGC */
/* temporary profiling space */
double gc_sweep_start_time;
size_t total_allocated_objects_at_gc_start;
size_t heap_used_at_gc_start;
/* basic statistics */
size_t count;
size_t total_freed_objects;
size_t total_allocated_pages;
size_t total_freed_pages;
} profile;
struct gc_list *global_list;
VALUE gc_stress_mode;
#if USE_RGENGC
struct {
VALUE parent_object;
int need_major_gc;
size_t last_major_gc;
size_t uncollectible_wb_unprotected_objects;
size_t uncollectible_wb_unprotected_objects_limit;
size_t old_objects;
size_t old_objects_limit;
#if RGENGC_ESTIMATE_OLDMALLOC
size_t oldmalloc_increase;
size_t oldmalloc_increase_limit;
#endif
#if RGENGC_CHECK_MODE >= 2
struct st_table *allrefs_table;
size_t error_count;
#endif
} rgengc;
struct {
size_t considered_count_table[T_MASK];
size_t moved_count_table[T_MASK];
} rcompactor;
#if GC_ENABLE_INCREMENTAL_MARK
struct {
size_t pooled_slots;
size_t step_slots;
} rincgc;
#endif
#endif /* USE_RGENGC */
st_table *id_to_obj_tbl;
st_table *obj_to_id_tbl;
#if GC_DEBUG_STRESS_TO_CLASS
VALUE stress_to_class;
#endif
} rb_objspace_t;
/* default tiny heap size: 16KB */
#define HEAP_PAGE_ALIGN_LOG 14
#define CEILDIV(i, mod) (((i) + (mod) - 1)/(mod))
enum {
HEAP_PAGE_ALIGN = (1UL << HEAP_PAGE_ALIGN_LOG),
HEAP_PAGE_ALIGN_MASK = (~(~0UL << HEAP_PAGE_ALIGN_LOG)),
REQUIRED_SIZE_BY_MALLOC = (sizeof(size_t) * 5),
HEAP_PAGE_SIZE = (HEAP_PAGE_ALIGN - REQUIRED_SIZE_BY_MALLOC),
HEAP_PAGE_OBJ_LIMIT = (unsigned int)((HEAP_PAGE_SIZE - sizeof(struct heap_page_header))/sizeof(struct RVALUE)),
HEAP_PAGE_BITMAP_LIMIT = CEILDIV(CEILDIV(HEAP_PAGE_SIZE, sizeof(struct RVALUE)), BITS_BITLENGTH),
HEAP_PAGE_BITMAP_SIZE = (BITS_SIZE * HEAP_PAGE_BITMAP_LIMIT),
HEAP_PAGE_BITMAP_PLANES = USE_RGENGC ? 4 : 1 /* RGENGC: mark, unprotected, uncollectible, marking */
};
struct heap_page {
short total_slots;
short free_slots;
short final_slots;
struct {
unsigned int before_sweep : 1;
unsigned int has_remembered_objects : 1;
unsigned int has_uncollectible_shady_objects : 1;
unsigned int in_tomb : 1;
} flags;
struct heap_page *free_next;
RVALUE *start;
RVALUE *freelist;
struct list_node page_node;
#if USE_RGENGC
bits_t wb_unprotected_bits[HEAP_PAGE_BITMAP_LIMIT];
#endif
/* the following three bitmaps are cleared at the beginning of full GC */
bits_t mark_bits[HEAP_PAGE_BITMAP_LIMIT];
#if USE_RGENGC
bits_t uncollectible_bits[HEAP_PAGE_BITMAP_LIMIT];
bits_t marking_bits[HEAP_PAGE_BITMAP_LIMIT];
#endif
/* If set, the object is not movable */
bits_t pinned_bits[HEAP_PAGE_BITMAP_LIMIT];
};
#define GET_PAGE_BODY(x) ((struct heap_page_body *)((bits_t)(x) & ~(HEAP_PAGE_ALIGN_MASK)))
#define GET_PAGE_HEADER(x) (&GET_PAGE_BODY(x)->header)
#define GET_HEAP_PAGE(x) (GET_PAGE_HEADER(x)->page)
#define NUM_IN_PAGE(p) (((bits_t)(p) & HEAP_PAGE_ALIGN_MASK)/sizeof(RVALUE))
#define BITMAP_INDEX(p) (NUM_IN_PAGE(p) / BITS_BITLENGTH )
#define BITMAP_OFFSET(p) (NUM_IN_PAGE(p) & (BITS_BITLENGTH-1))
#define BITMAP_BIT(p) ((bits_t)1 << BITMAP_OFFSET(p))
/* Bitmap Operations */
#define MARKED_IN_BITMAP(bits, p) ((bits)[BITMAP_INDEX(p)] & BITMAP_BIT(p))
#define MARK_IN_BITMAP(bits, p) ((bits)[BITMAP_INDEX(p)] = (bits)[BITMAP_INDEX(p)] | BITMAP_BIT(p))
#define CLEAR_IN_BITMAP(bits, p) ((bits)[BITMAP_INDEX(p)] = (bits)[BITMAP_INDEX(p)] & ~BITMAP_BIT(p))
/* getting bitmap */
#define GET_HEAP_MARK_BITS(x) (&GET_HEAP_PAGE(x)->mark_bits[0])
#define GET_HEAP_PINNED_BITS(x) (&GET_HEAP_PAGE(x)->pinned_bits[0])
#if USE_RGENGC
#define GET_HEAP_UNCOLLECTIBLE_BITS(x) (&GET_HEAP_PAGE(x)->uncollectible_bits[0])
#define GET_HEAP_WB_UNPROTECTED_BITS(x) (&GET_HEAP_PAGE(x)->wb_unprotected_bits[0])
#define GET_HEAP_MARKING_BITS(x) (&GET_HEAP_PAGE(x)->marking_bits[0])
#endif
/* Aliases */
#define rb_objspace (*rb_objspace_of(GET_VM()))
#define rb_objspace_of(vm) ((vm)->objspace)
#define ruby_initial_gc_stress gc_params.gc_stress
VALUE *ruby_initial_gc_stress_ptr = &ruby_initial_gc_stress;
#define malloc_limit objspace->malloc_params.limit
#define malloc_increase objspace->malloc_params.increase
#define malloc_allocated_size objspace->malloc_params.allocated_size
#define heap_pages_sorted objspace->heap_pages.sorted
#define heap_allocated_pages objspace->heap_pages.allocated_pages
#define heap_pages_sorted_length objspace->heap_pages.sorted_length
#define heap_pages_lomem objspace->heap_pages.range[0]
#define heap_pages_himem objspace->heap_pages.range[1]
#define heap_allocatable_pages objspace->heap_pages.allocatable_pages
#define heap_pages_freeable_pages objspace->heap_pages.freeable_pages
#define heap_pages_final_slots objspace->heap_pages.final_slots
#define heap_pages_deferred_final objspace->heap_pages.deferred_final
#define heap_eden (&objspace->eden_heap)
#define heap_tomb (&objspace->tomb_heap)
#define dont_gc objspace->flags.dont_gc
#define during_gc objspace->flags.during_gc
#define finalizing objspace->atomic_flags.finalizing
#define finalizer_table objspace->finalizer_table
#define global_list objspace->global_list
#define ruby_gc_stressful objspace->flags.gc_stressful
#define ruby_gc_stress_mode objspace->gc_stress_mode
#if GC_DEBUG_STRESS_TO_CLASS
#define stress_to_class objspace->stress_to_class
#else
#define stress_to_class 0
#endif
static inline enum gc_mode
gc_mode_verify(enum gc_mode mode)
{
#if RGENGC_CHECK_MODE > 0
switch (mode) {
case gc_mode_none:
case gc_mode_marking:
case gc_mode_sweeping:
break;
default:
rb_bug("gc_mode_verify: unreachable (%d)", (int)mode);
}
#endif
return mode;
}
#define gc_mode(objspace) gc_mode_verify((enum gc_mode)(objspace)->flags.mode)
#define gc_mode_set(objspace, mode) ((objspace)->flags.mode = (unsigned int)gc_mode_verify(mode))
#define is_marking(objspace) (gc_mode(objspace) == gc_mode_marking)
#define is_sweeping(objspace) (gc_mode(objspace) == gc_mode_sweeping)
#if USE_RGENGC
#define is_full_marking(objspace) ((objspace)->flags.during_minor_gc == FALSE)
#else
#define is_full_marking(objspace) TRUE
#endif
#if GC_ENABLE_INCREMENTAL_MARK
#define is_incremental_marking(objspace) ((objspace)->flags.during_incremental_marking != FALSE)
#else
#define is_incremental_marking(objspace) FALSE
#endif
#if GC_ENABLE_INCREMENTAL_MARK
#define will_be_incremental_marking(objspace) ((objspace)->rgengc.need_major_gc != GPR_FLAG_NONE)
#else
#define will_be_incremental_marking(objspace) FALSE
#endif
#define has_sweeping_pages(heap) ((heap)->sweeping_page != 0)
#define is_lazy_sweeping(heap) (GC_ENABLE_LAZY_SWEEP && has_sweeping_pages(heap))
#if SIZEOF_LONG == SIZEOF_VOIDP
# define nonspecial_obj_id(obj) (VALUE)((SIGNED_VALUE)(obj)|FIXNUM_FLAG)
# define obj_id_to_ref(objid) ((objid) ^ FIXNUM_FLAG) /* unset FIXNUM_FLAG */
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
# define nonspecial_obj_id(obj) LL2NUM((SIGNED_VALUE)(obj) / 2)
# define obj_id_to_ref(objid) (FIXNUM_P(objid) ? \
((objid) ^ FIXNUM_FLAG) : (NUM2PTR(objid) << 1))
#else
# error not supported
#endif
#define RANY(o) ((RVALUE*)(o))
struct RZombie {
struct RBasic basic;
VALUE next;
void (*dfree)(void *);
void *data;
};
#define RZOMBIE(o) ((struct RZombie *)(o))
#define nomem_error GET_VM()->special_exceptions[ruby_error_nomemory]
#if RUBY_MARK_FREE_DEBUG
int ruby_gc_debug_indent = 0;
#endif
VALUE rb_mGC;
int ruby_disable_gc = 0;
void rb_iseq_mark(const rb_iseq_t *iseq);
void rb_iseq_update_references(rb_iseq_t *iseq);
void rb_iseq_free(const rb_iseq_t *iseq);
size_t rb_iseq_memsize(const rb_iseq_t *iseq);
void rb_vm_update_references(void *ptr);
void rb_gcdebug_print_obj_condition(VALUE obj);
static VALUE define_final0(VALUE obj, VALUE block);
NORETURN(static void negative_size_allocation_error(const char *));
static void init_mark_stack(mark_stack_t *stack);
static int ready_to_gc(rb_objspace_t *objspace);
static int garbage_collect(rb_objspace_t *, int reason);
static int gc_start(rb_objspace_t *objspace, int reason);
static void gc_rest(rb_objspace_t *objspace);
static inline void gc_enter(rb_objspace_t *objspace, const char *event);
static inline void gc_exit(rb_objspace_t *objspace, const char *event);
static void gc_marks(rb_objspace_t *objspace, int full_mark);
static void gc_marks_start(rb_objspace_t *objspace, int full);
static int gc_marks_finish(rb_objspace_t *objspace);
static void gc_marks_rest(rb_objspace_t *objspace);
static void gc_marks_step(rb_objspace_t *objspace, int slots);
static void gc_marks_continue(rb_objspace_t *objspace, rb_heap_t *heap);
static void gc_sweep(rb_objspace_t *objspace);
static void gc_sweep_start(rb_objspace_t *objspace);
static void gc_sweep_finish(rb_objspace_t *objspace);
static int gc_sweep_step(rb_objspace_t *objspace, rb_heap_t *heap);
static void gc_sweep_rest(rb_objspace_t *objspace);
static void gc_sweep_continue(rb_objspace_t *objspace, rb_heap_t *heap);
static inline void gc_mark(rb_objspace_t *objspace, VALUE ptr);
static inline void gc_pin(rb_objspace_t *objspace, VALUE ptr);
static inline void gc_mark_and_pin(rb_objspace_t *objspace, VALUE ptr);
static void gc_mark_ptr(rb_objspace_t *objspace, VALUE ptr);
NO_SANITIZE("memory", static void gc_mark_maybe(rb_objspace_t *objspace, VALUE ptr));
static void gc_mark_children(rb_objspace_t *objspace, VALUE ptr);
static int gc_mark_stacked_objects_incremental(rb_objspace_t *, size_t count);
static int gc_mark_stacked_objects_all(rb_objspace_t *);
static void gc_grey(rb_objspace_t *objspace, VALUE ptr);
static inline int gc_mark_set(rb_objspace_t *objspace, VALUE obj);
NO_SANITIZE("memory", static inline int is_pointer_to_heap(rb_objspace_t *objspace, void *ptr));
static void push_mark_stack(mark_stack_t *, VALUE);
static int pop_mark_stack(mark_stack_t *, VALUE *);
static size_t mark_stack_size(mark_stack_t *stack);
static void shrink_stack_chunk_cache(mark_stack_t *stack);
static size_t obj_memsize_of(VALUE obj, int use_all_types);
static void gc_verify_internal_consistency(rb_objspace_t *objspace);
static int gc_verify_heap_page(rb_objspace_t *objspace, struct heap_page *page, VALUE obj);
static int gc_verify_heap_pages(rb_objspace_t *objspace);
static void gc_stress_set(rb_objspace_t *objspace, VALUE flag);
static double getrusage_time(void);
static inline void gc_prof_setup_new_record(rb_objspace_t *objspace, int reason);
static inline void gc_prof_timer_start(rb_objspace_t *);
static inline void gc_prof_timer_stop(rb_objspace_t *);
static inline void gc_prof_mark_timer_start(rb_objspace_t *);
static inline void gc_prof_mark_timer_stop(rb_objspace_t *);
static inline void gc_prof_sweep_timer_start(rb_objspace_t *);
static inline void gc_prof_sweep_timer_stop(rb_objspace_t *);
static inline void gc_prof_set_malloc_info(rb_objspace_t *);
static inline void gc_prof_set_heap_info(rb_objspace_t *);
#define TYPED_UPDATE_IF_MOVED(_objspace, _type, _thing) do { \
if (gc_object_moved_p(_objspace, (VALUE)_thing)) { \
*((_type *)(&_thing)) = (_type)RMOVED((_thing))->destination; \
} \
} while (0)
#define UPDATE_IF_MOVED(_objspace, _thing) TYPED_UPDATE_IF_MOVED(_objspace, VALUE, _thing)
#define gc_prof_record(objspace) (objspace)->profile.current_record
#define gc_prof_enabled(objspace) ((objspace)->profile.run && (objspace)->profile.current_record)
#ifdef HAVE_VA_ARGS_MACRO
# define gc_report(level, objspace, ...) \
if (!RGENGC_DEBUG_ENABLED(level)) {} else gc_report_body(level, objspace, __VA_ARGS__)
#else
# define gc_report if (!RGENGC_DEBUG_ENABLED(0)) {} else gc_report_body
#endif
PRINTF_ARGS(static void gc_report_body(int level, rb_objspace_t *objspace, const char *fmt, ...), 3, 4);
static const char *obj_info(VALUE obj);
#define PUSH_MARK_FUNC_DATA(v) do { \
struct mark_func_data_struct *prev_mark_func_data = objspace->mark_func_data; \
objspace->mark_func_data = (v);
#define POP_MARK_FUNC_DATA() objspace->mark_func_data = prev_mark_func_data;} while (0)
/*
* 1 - TSC (H/W Time Stamp Counter)
* 2 - getrusage
*/
#ifndef TICK_TYPE
#define TICK_TYPE 1
#endif
#if USE_TICK_T
#if TICK_TYPE == 1
/* the following code is only for internal tuning. */
/* Source code to use RDTSC is quoted and modified from
* http://www.mcs.anl.gov/~kazutomo/rdtsc.html
* written by Kazutomo Yoshii <kazutomo@mcs.anl.gov>
*/
#if defined(__GNUC__) && defined(__i386__)
typedef unsigned long long tick_t;
#define PRItick "llu"
static inline tick_t
tick(void)
{
unsigned long long int x;
__asm__ __volatile__ ("rdtsc" : "=A" (x));
return x;
}
#elif defined(__GNUC__) && defined(__x86_64__)
typedef unsigned long long tick_t;
#define PRItick "llu"
static __inline__ tick_t
tick(void)
{
unsigned long hi, lo;
__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
return ((unsigned long long)lo)|( ((unsigned long long)hi)<<32);
}
#elif defined(__powerpc64__) && GCC_VERSION_SINCE(4,8,0)
typedef unsigned long long tick_t;
#define PRItick "llu"
static __inline__ tick_t
tick(void)
{
unsigned long long val = __builtin_ppc_get_timebase();
return val;
}
#elif defined(_WIN32) && defined(_MSC_VER)
#include <intrin.h>
typedef unsigned __int64 tick_t;
#define PRItick "llu"
static inline tick_t
tick(void)
{
return __rdtsc();
}
#else /* use clock */
typedef clock_t tick_t;
#define PRItick "llu"
static inline tick_t
tick(void)
{
return clock();
}
#endif /* TSC */
#elif TICK_TYPE == 2
typedef double tick_t;
#define PRItick "4.9f"
static inline tick_t
tick(void)
{
return getrusage_time();
}
#else /* TICK_TYPE */
#error "choose tick type"
#endif /* TICK_TYPE */
#define MEASURE_LINE(expr) do { \
volatile tick_t start_time = tick(); \
volatile tick_t end_time; \
expr; \
end_time = tick(); \
fprintf(stderr, "0\t%"PRItick"\t%s\n", end_time - start_time, #expr); \
} while (0)
#else /* USE_TICK_T */
#define MEASURE_LINE(expr) expr
#endif /* USE_TICK_T */
#define FL_CHECK2(name, x, pred) \
((RGENGC_CHECK_MODE && SPECIAL_CONST_P(x)) ? \
(rb_bug(name": SPECIAL_CONST (%p)", (void *)(x)), 0) : (pred))
#define FL_TEST2(x,f) FL_CHECK2("FL_TEST2", x, FL_TEST_RAW((x),(f)) != 0)
#define FL_SET2(x,f) FL_CHECK2("FL_SET2", x, RBASIC(x)->flags |= (f))
#define FL_UNSET2(x,f) FL_CHECK2("FL_UNSET2", x, RBASIC(x)->flags &= ~(f))
#define RVALUE_MARK_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_MARK_BITS(obj), (obj))
#define RVALUE_PIN_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_PINNED_BITS(obj), (obj))
#define RVALUE_PAGE_MARKED(page, obj) MARKED_IN_BITMAP((page)->mark_bits, (obj))
#if USE_RGENGC
#define RVALUE_WB_UNPROTECTED_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS(obj), (obj))
#define RVALUE_UNCOLLECTIBLE_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS(obj), (obj))
#define RVALUE_MARKING_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), (obj))
#define RVALUE_PAGE_WB_UNPROTECTED(page, obj) MARKED_IN_BITMAP((page)->wb_unprotected_bits, (obj))
#define RVALUE_PAGE_UNCOLLECTIBLE(page, obj) MARKED_IN_BITMAP((page)->uncollectible_bits, (obj))
#define RVALUE_PAGE_MARKING(page, obj) MARKED_IN_BITMAP((page)->marking_bits, (obj))
#define RVALUE_OLD_AGE 3
#define RVALUE_AGE_SHIFT 5 /* FL_PROMOTED0 bit */
static int rgengc_remembered(rb_objspace_t *objspace, VALUE obj);
static int rgengc_remembered_sweep(rb_objspace_t *objspace, VALUE obj);
static int rgengc_remember(rb_objspace_t *objspace, VALUE obj);
static void rgengc_mark_and_rememberset_clear(rb_objspace_t *objspace, rb_heap_t *heap);
static void rgengc_rememberset_mark(rb_objspace_t *objspace, rb_heap_t *heap);
static inline int
RVALUE_FLAGS_AGE(VALUE flags)
{
return (int)((flags & (FL_PROMOTED0 | FL_PROMOTED1)) >> RVALUE_AGE_SHIFT);
}
#endif /* USE_RGENGC */
static int
check_rvalue_consistency_force(const VALUE obj, int terminate)
{
rb_objspace_t *objspace = &rb_objspace;
int err = 0;
if (SPECIAL_CONST_P(obj)) {
fprintf(stderr, "check_rvalue_consistency: %p is a special const.\n", (void *)obj);
err++;
}
else if (!is_pointer_to_heap(objspace, (void *)obj)) {
/* check if it is in tomb_pages */
struct heap_page *page = NULL;
list_for_each(&heap_tomb->pages, page, page_node) {
if (&page->start[0] <= (RVALUE *)obj &&
(RVALUE *)obj < &page->start[page->total_slots]) {
fprintf(stderr, "check_rvalue_consistency: %p is in a tomb_heap (%p).\n",
(void *)obj, (void *)page);
err++;
goto skip;
}
}
fprintf(stderr, "check_rvalue_consistency: %p is not a Ruby object.\n", (void *)obj);
err++;
skip:
;
}
else {
const int wb_unprotected_bit = RVALUE_WB_UNPROTECTED_BITMAP(obj) != 0;
const int uncollectible_bit = RVALUE_UNCOLLECTIBLE_BITMAP(obj) != 0;
const int mark_bit = RVALUE_MARK_BITMAP(obj) != 0;
const int marking_bit = RVALUE_MARKING_BITMAP(obj) != 0, remembered_bit = marking_bit;
const int age = RVALUE_FLAGS_AGE(RBASIC(obj)->flags);
if (GET_HEAP_PAGE(obj)->flags.in_tomb) {
fprintf(stderr, "check_rvalue_consistency: %s is in tomb page.\n", obj_info(obj));
err++;
}
if (BUILTIN_TYPE(obj) == T_NONE) {
fprintf(stderr, "check_rvalue_consistency: %s is T_NONE.\n", obj_info(obj));
err++;
}
if (BUILTIN_TYPE(obj) == T_ZOMBIE) {
fprintf(stderr, "check_rvalue_consistency: %s is T_ZOMBIE.\n", obj_info(obj));
err++;
}
obj_memsize_of((VALUE)obj, FALSE);
/* check generation
*
* OLD == age == 3 && old-bitmap && mark-bit (except incremental marking)
*/
if (age > 0 && wb_unprotected_bit) {
fprintf(stderr, "check_rvalue_consistency: %s is not WB protected, but age is %d > 0.\n", obj_info(obj), age);
err++;
}
if (!is_marking(objspace) && uncollectible_bit && !mark_bit) {
fprintf(stderr, "check_rvalue_consistency: %s is uncollectible, but is not marked while !gc.\n", obj_info(obj));
err++;
}
if (!is_full_marking(objspace)) {
if (uncollectible_bit && age != RVALUE_OLD_AGE && !wb_unprotected_bit) {
fprintf(stderr, "check_rvalue_consistency: %s is uncollectible, but not old (age: %d) and not WB unprotected.\n",
obj_info(obj), age);
err++;
}
if (remembered_bit && age != RVALUE_OLD_AGE) {
fprintf(stderr, "check_rvalue_consistency: %s is remembered, but not old (age: %d).\n",
obj_info(obj), age);
err++;
}
}
/*
* check coloring
*
* marking:false marking:true
* marked:false white *invalid*
* marked:true black grey
*/
if (is_incremental_marking(objspace) && marking_bit) {
if (!is_marking(objspace) && !mark_bit) {
fprintf(stderr, "check_rvalue_consistency: %s is marking, but not marked.\n", obj_info(obj));
err++;
}
}
}
if (err > 0 && terminate) {
rb_bug("check_rvalue_consistency_force: there is %d errors.", err);
}
return err;
}
#if RGENGC_CHECK_MODE == 0
static inline VALUE
check_rvalue_consistency(const VALUE obj)
{
return obj;
}
#else
static VALUE
check_rvalue_consistency(const VALUE obj)
{
check_rvalue_consistency_force(obj, TRUE);
return obj;
}
#endif
static inline int
gc_object_moved_p(rb_objspace_t * objspace, VALUE obj)
{
if (RB_SPECIAL_CONST_P(obj)) {
return FALSE;
}
else {
void *poisoned = asan_poisoned_object_p(obj);
asan_unpoison_object(obj, false);
int ret = BUILTIN_TYPE(obj) == T_MOVED;
/* Re-poison slot if it's not the one we want */
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE(obj) == T_NONE);
asan_poison_object(obj);
}
return ret;
}
}
static inline int
RVALUE_MARKED(VALUE obj)
{
check_rvalue_consistency(obj);
return RVALUE_MARK_BITMAP(obj) != 0;
}
static inline int
RVALUE_PINNED(VALUE obj)
{
check_rvalue_consistency(obj);
return RVALUE_PIN_BITMAP(obj) != 0;
}
#if USE_RGENGC
static inline int
RVALUE_WB_UNPROTECTED(VALUE obj)
{
check_rvalue_consistency(obj);
return RVALUE_WB_UNPROTECTED_BITMAP(obj) != 0;
}
static inline int
RVALUE_MARKING(VALUE obj)
{
check_rvalue_consistency(obj);
return RVALUE_MARKING_BITMAP(obj) != 0;
}
static inline int
RVALUE_REMEMBERED(VALUE obj)
{
check_rvalue_consistency(obj);
return RVALUE_MARKING_BITMAP(obj) != 0;
}
static inline int
RVALUE_UNCOLLECTIBLE(VALUE obj)
{
check_rvalue_consistency(obj);
return RVALUE_UNCOLLECTIBLE_BITMAP(obj) != 0;
}
static inline int
RVALUE_OLD_P_RAW(VALUE obj)
{
const VALUE promoted = FL_PROMOTED0 | FL_PROMOTED1;
return (RBASIC(obj)->flags & promoted) == promoted;
}
static inline int
RVALUE_OLD_P(VALUE obj)
{
check_rvalue_consistency(obj);
return RVALUE_OLD_P_RAW(obj);
}
#if RGENGC_CHECK_MODE || GC_DEBUG
static inline int
RVALUE_AGE(VALUE obj)
{
check_rvalue_consistency(obj);
return RVALUE_FLAGS_AGE(RBASIC(obj)->flags);
}
#endif
static inline void
RVALUE_PAGE_OLD_UNCOLLECTIBLE_SET(rb_objspace_t *objspace, struct heap_page *page, VALUE obj)
{
MARK_IN_BITMAP(&page->uncollectible_bits[0], obj);
objspace->rgengc.old_objects++;
rb_transient_heap_promote(obj);
#if RGENGC_PROFILE >= 2
objspace->profile.total_promoted_count++;
objspace->profile.promoted_types[BUILTIN_TYPE(obj)]++;
#endif
}
static inline void
RVALUE_OLD_UNCOLLECTIBLE_SET(rb_objspace_t *objspace, VALUE obj)
{
RB_DEBUG_COUNTER_INC(obj_promote);
RVALUE_PAGE_OLD_UNCOLLECTIBLE_SET(objspace, GET_HEAP_PAGE(obj), obj);
}
static inline VALUE
RVALUE_FLAGS_AGE_SET(VALUE flags, int age)
{
flags &= ~(FL_PROMOTED0 | FL_PROMOTED1);
flags |= (age << RVALUE_AGE_SHIFT);
return flags;
}
/* set age to age+1 */
static inline void
RVALUE_AGE_INC(rb_objspace_t *objspace, VALUE obj)
{
VALUE flags = RBASIC(obj)->flags;
int age = RVALUE_FLAGS_AGE(flags);
if (RGENGC_CHECK_MODE && age == RVALUE_OLD_AGE) {
rb_bug("RVALUE_AGE_INC: can not increment age of OLD object %s.", obj_info(obj));
}
age++;
RBASIC(obj)->flags = RVALUE_FLAGS_AGE_SET(flags, age);
if (age == RVALUE_OLD_AGE) {
RVALUE_OLD_UNCOLLECTIBLE_SET(objspace, obj);
}
check_rvalue_consistency(obj);
}
/* set age to RVALUE_OLD_AGE */
static inline void
RVALUE_AGE_SET_OLD(rb_objspace_t *objspace, VALUE obj)
{
check_rvalue_consistency(obj);
GC_ASSERT(!RVALUE_OLD_P(obj));
RBASIC(obj)->flags = RVALUE_FLAGS_AGE_SET(RBASIC(obj)->flags, RVALUE_OLD_AGE);
RVALUE_OLD_UNCOLLECTIBLE_SET(objspace, obj);
check_rvalue_consistency(obj);
}
/* set age to RVALUE_OLD_AGE - 1 */
static inline void
RVALUE_AGE_SET_CANDIDATE(rb_objspace_t *objspace, VALUE obj)
{
check_rvalue_consistency(obj);
GC_ASSERT(!RVALUE_OLD_P(obj));
RBASIC(obj)->flags = RVALUE_FLAGS_AGE_SET(RBASIC(obj)->flags, RVALUE_OLD_AGE - 1);
check_rvalue_consistency(obj);
}
static inline void
RVALUE_DEMOTE_RAW(rb_objspace_t *objspace, VALUE obj)
{
RBASIC(obj)->flags = RVALUE_FLAGS_AGE_SET(RBASIC(obj)->flags, 0);
CLEAR_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS(obj), obj);
}
static inline void
RVALUE_DEMOTE(rb_objspace_t *objspace, VALUE obj)
{
check_rvalue_consistency(obj);
GC_ASSERT(RVALUE_OLD_P(obj));
if (!is_incremental_marking(objspace) && RVALUE_REMEMBERED(obj)) {
CLEAR_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), obj);
}
RVALUE_DEMOTE_RAW(objspace, obj);
if (RVALUE_MARKED(obj)) {
objspace->rgengc.old_objects--;
}
check_rvalue_consistency(obj);
}
static inline void
RVALUE_AGE_RESET_RAW(VALUE obj)
{
RBASIC(obj)->flags = RVALUE_FLAGS_AGE_SET(RBASIC(obj)->flags, 0);
}
static inline void
RVALUE_AGE_RESET(VALUE obj)
{
check_rvalue_consistency(obj);
GC_ASSERT(!RVALUE_OLD_P(obj));
RVALUE_AGE_RESET_RAW(obj);
check_rvalue_consistency(obj);
}
static inline int
RVALUE_BLACK_P(VALUE obj)
{
return RVALUE_MARKED(obj) && !RVALUE_MARKING(obj);
}
#if 0
static inline int
RVALUE_GREY_P(VALUE obj)
{
return RVALUE_MARKED(obj) && RVALUE_MARKING(obj);
}
#endif
static inline int
RVALUE_WHITE_P(VALUE obj)
{
return RVALUE_MARKED(obj) == FALSE;
}
#endif /* USE_RGENGC */
/*
--------------------------- ObjectSpace -----------------------------
*/
static inline void *
calloc1(size_t n)
{
return calloc(1, n);
}
rb_objspace_t *
rb_objspace_alloc(void)
{
rb_objspace_t *objspace = calloc1(sizeof(rb_objspace_t));
malloc_limit = gc_params.malloc_limit_min;
list_head_init(&objspace->eden_heap.pages);
list_head_init(&objspace->tomb_heap.pages);
return objspace;
}
static void free_stack_chunks(mark_stack_t *);
static void heap_page_free(rb_objspace_t *objspace, struct heap_page *page);
void
rb_objspace_free(rb_objspace_t *objspace)
{
if (is_lazy_sweeping(heap_eden))
rb_bug("lazy sweeping underway when freeing object space");
if (objspace->profile.records) {
free(objspace->profile.records);
objspace->profile.records = 0;
}
if (global_list) {
struct gc_list *list, *next;
for (list = global_list; list; list = next) {
next = list->next;
xfree(list);
}
}
if (heap_pages_sorted) {
size_t i;
for (i = 0; i < heap_allocated_pages; ++i) {
heap_page_free(objspace, heap_pages_sorted[i]);
}
free(heap_pages_sorted);
heap_allocated_pages = 0;
heap_pages_sorted_length = 0;
heap_pages_lomem = 0;
heap_pages_himem = 0;
objspace->eden_heap.total_pages = 0;
objspace->eden_heap.total_slots = 0;
}
st_free_table(objspace->id_to_obj_tbl);
st_free_table(objspace->obj_to_id_tbl);
free_stack_chunks(&objspace->mark_stack);
free(objspace);
}
static void
heap_pages_expand_sorted_to(rb_objspace_t *objspace, size_t next_length)
{
struct heap_page **sorted;
size_t size = size_mul_or_raise(next_length, sizeof(struct heap_page *), rb_eRuntimeError);
gc_report(3, objspace, "heap_pages_expand_sorted: next_length: %d, size: %d\n", (int)next_length, (int)size);
if (heap_pages_sorted_length > 0) {
sorted = (struct heap_page **)realloc(heap_pages_sorted, size);
if (sorted) heap_pages_sorted = sorted;
}
else {
sorted = heap_pages_sorted = (struct heap_page **)malloc(size);
}
if (sorted == 0) {
rb_memerror();
}
heap_pages_sorted_length = next_length;
}
static void
heap_pages_expand_sorted(rb_objspace_t *objspace)
{
/* usually heap_allocatable_pages + heap_eden->total_pages == heap_pages_sorted_length
* because heap_allocatable_pages contains heap_tomb->total_pages (recycle heap_tomb pages).
* however, if there are pages which do not have empty slots, then try to create new pages
* so that the additional allocatable_pages counts (heap_tomb->total_pages) are added.
*/
size_t next_length = heap_allocatable_pages;
next_length += heap_eden->total_pages;
next_length += heap_tomb->total_pages;
if (next_length > heap_pages_sorted_length) {
heap_pages_expand_sorted_to(objspace, next_length);
}
GC_ASSERT(heap_allocatable_pages + heap_eden->total_pages <= heap_pages_sorted_length);
GC_ASSERT(heap_allocated_pages <= heap_pages_sorted_length);
}
static void
heap_allocatable_pages_set(rb_objspace_t *objspace, size_t s)
{
heap_allocatable_pages = s;
heap_pages_expand_sorted(objspace);
}
static inline void
heap_page_add_freeobj(rb_objspace_t *objspace, struct heap_page *page, VALUE obj)
{
RVALUE *p = (RVALUE *)obj;
asan_unpoison_memory_region(&page->freelist, sizeof(RVALUE*), false);
p->as.free.flags = 0;
p->as.free.next = page->freelist;
page->freelist = p;
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
if (RGENGC_CHECK_MODE &&
/* obj should belong to page */
!(&page->start[0] <= (RVALUE *)obj &&
(RVALUE *)obj < &page->start[page->total_slots] &&
obj % sizeof(RVALUE) == 0)) {
rb_bug("heap_page_add_freeobj: %p is not rvalue.", (void *)p);
}
asan_poison_object(obj);
gc_report(3, objspace, "heap_page_add_freeobj: add %p to freelist\n", (void *)obj);
}
static inline void
heap_add_freepage(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *page)
{
asan_unpoison_memory_region(&page->freelist, sizeof(RVALUE*), false);
if (page->freelist) {
page->free_next = heap->free_pages;
heap->free_pages = page;
}
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
}
#if GC_ENABLE_INCREMENTAL_MARK
static inline int
heap_add_poolpage(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *page)
{
asan_unpoison_memory_region(&page->freelist, sizeof(RVALUE*), false);
if (page->freelist) {
page->free_next = heap->pooled_pages;
heap->pooled_pages = page;
objspace->rincgc.pooled_slots += page->free_slots;
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
return TRUE;
}
else {
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
return FALSE;
}
}
#endif
static void
heap_unlink_page(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *page)
{
list_del(&page->page_node);
heap->total_pages--;
heap->total_slots -= page->total_slots;
}
static void
heap_page_free(rb_objspace_t *objspace, struct heap_page *page)
{
heap_allocated_pages--;
objspace->profile.total_freed_pages++;
rb_aligned_free(GET_PAGE_BODY(page->start));
free(page);
}
static void
heap_pages_free_unused_pages(rb_objspace_t *objspace)
{
size_t i, j;
if (!list_empty(&heap_tomb->pages)) {
for (i = j = 1; j < heap_allocated_pages; i++) {
struct heap_page *page = heap_pages_sorted[i];
if (page->flags.in_tomb && page->free_slots == page->total_slots) {
heap_unlink_page(objspace, heap_tomb, page);
heap_page_free(objspace, page);
}
else {
if (i != j) {
heap_pages_sorted[j] = page;
}
j++;
}
}
GC_ASSERT(j == heap_allocated_pages);
}
}
static struct heap_page *
heap_page_allocate(rb_objspace_t *objspace)
{
RVALUE *start, *end, *p;
struct heap_page *page;
struct heap_page_body *page_body = 0;
size_t hi, lo, mid;
int limit = HEAP_PAGE_OBJ_LIMIT;
/* assign heap_page body (contains heap_page_header and RVALUEs) */
page_body = (struct heap_page_body *)rb_aligned_malloc(HEAP_PAGE_ALIGN, HEAP_PAGE_SIZE);
if (page_body == 0) {
rb_memerror();
}
/* assign heap_page entry */
page = calloc1(sizeof(struct heap_page));
if (page == 0) {
rb_aligned_free(page_body);
rb_memerror();
}
/* adjust obj_limit (object number available in this page) */
start = (RVALUE*)((VALUE)page_body + sizeof(struct heap_page_header));
if ((VALUE)start % sizeof(RVALUE) != 0) {
int delta = (int)(sizeof(RVALUE) - ((VALUE)start % sizeof(RVALUE)));
start = (RVALUE*)((VALUE)start + delta);
limit = (HEAP_PAGE_SIZE - (int)((VALUE)start - (VALUE)page_body))/(int)sizeof(RVALUE);
}
end = start + limit;
/* setup heap_pages_sorted */
lo = 0;
hi = heap_allocated_pages;
while (lo < hi) {
struct heap_page *mid_page;
mid = (lo + hi) / 2;
mid_page = heap_pages_sorted[mid];
if (mid_page->start < start) {
lo = mid + 1;
}
else if (mid_page->start > start) {
hi = mid;
}
else {
rb_bug("same heap page is allocated: %p at %"PRIuVALUE, (void *)page_body, (VALUE)mid);
}
}
if (hi < heap_allocated_pages) {
MEMMOVE(&heap_pages_sorted[hi+1], &heap_pages_sorted[hi], struct heap_page_header*, heap_allocated_pages - hi);
}
heap_pages_sorted[hi] = page;
heap_allocated_pages++;
GC_ASSERT(heap_eden->total_pages + heap_allocatable_pages <= heap_pages_sorted_length);
GC_ASSERT(heap_eden->total_pages + heap_tomb->total_pages == heap_allocated_pages - 1);
GC_ASSERT(heap_allocated_pages <= heap_pages_sorted_length);
objspace->profile.total_allocated_pages++;
if (heap_allocated_pages > heap_pages_sorted_length) {
rb_bug("heap_page_allocate: allocated(%"PRIdSIZE") > sorted(%"PRIdSIZE")",
heap_allocated_pages, heap_pages_sorted_length);
}
if (heap_pages_lomem == 0 || heap_pages_lomem > start) heap_pages_lomem = start;
if (heap_pages_himem < end) heap_pages_himem = end;
page->start = start;
page->total_slots = limit;
page_body->header.page = page;
for (p = start; p != end; p++) {
gc_report(3, objspace, "assign_heap_page: %p is added to freelist\n", (void *)p);
heap_page_add_freeobj(objspace, page, (VALUE)p);
}
page->free_slots = limit;
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
return page;
}
static struct heap_page *
heap_page_resurrect(rb_objspace_t *objspace)
{
struct heap_page *page = 0, *next;
list_for_each_safe(&heap_tomb->pages, page, next, page_node) {
asan_unpoison_memory_region(&page->freelist, sizeof(RVALUE*), false);
if (page->freelist != NULL) {
heap_unlink_page(objspace, heap_tomb, page);
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
return page;
}
}
return NULL;
}
static struct heap_page *
heap_page_create(rb_objspace_t *objspace)
{
struct heap_page *page;
const char *method = "recycle";
heap_allocatable_pages--;
page = heap_page_resurrect(objspace);
if (page == NULL) {
page = heap_page_allocate(objspace);
method = "allocate";
}
if (0) fprintf(stderr, "heap_page_create: %s - %p, heap_allocated_pages: %d, heap_allocated_pages: %d, tomb->total_pages: %d\n",
method, (void *)page, (int)heap_pages_sorted_length, (int)heap_allocated_pages, (int)heap_tomb->total_pages);
return page;
}
static void
heap_add_page(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *page)
{
page->flags.in_tomb = (heap == heap_tomb);
list_add(&heap->pages, &page->page_node);
heap->total_pages++;
heap->total_slots += page->total_slots;
}
static void
heap_assign_page(rb_objspace_t *objspace, rb_heap_t *heap)
{
struct heap_page *page = heap_page_create(objspace);
heap_add_page(objspace, heap, page);
heap_add_freepage(objspace, heap, page);
}
static void
heap_add_pages(rb_objspace_t *objspace, rb_heap_t *heap, size_t add)
{
size_t i;
heap_allocatable_pages_set(objspace, add);
for (i = 0; i < add; i++) {
heap_assign_page(objspace, heap);
}
GC_ASSERT(heap_allocatable_pages == 0);
}
static size_t
heap_extend_pages(rb_objspace_t *objspace, size_t free_slots, size_t total_slots)
{
double goal_ratio = gc_params.heap_free_slots_goal_ratio;
size_t used = heap_allocated_pages + heap_allocatable_pages;
size_t next_used;
if (goal_ratio == 0.0) {
next_used = (size_t)(used * gc_params.growth_factor);
}
else {
/* Find `f' where free_slots = f * total_slots * goal_ratio
* => f = (total_slots - free_slots) / ((1 - goal_ratio) * total_slots)
*/
double f = (double)(total_slots - free_slots) / ((1 - goal_ratio) * total_slots);
if (f > gc_params.growth_factor) f = gc_params.growth_factor;
if (f < 1.0) f = 1.1;
next_used = (size_t)(f * used);
if (0) {
fprintf(stderr,
"free_slots(%8"PRIuSIZE")/total_slots(%8"PRIuSIZE")=%1.2f,"
" G(%1.2f), f(%1.2f),"
" used(%8"PRIuSIZE") => next_used(%8"PRIuSIZE")\n",
free_slots, total_slots, free_slots/(double)total_slots,
goal_ratio, f, used, next_used);
}
}
if (gc_params.growth_max_slots > 0) {
size_t max_used = (size_t)(used + gc_params.growth_max_slots/HEAP_PAGE_OBJ_LIMIT);
if (next_used > max_used) next_used = max_used;
}
return next_used - used;
}
static void
heap_set_increment(rb_objspace_t *objspace, size_t additional_pages)
{
size_t used = heap_eden->total_pages;
size_t next_used_limit = used + additional_pages;
if (next_used_limit == heap_allocated_pages) next_used_limit++;
heap_allocatable_pages_set(objspace, next_used_limit - used);
gc_report(1, objspace, "heap_set_increment: heap_allocatable_pages is %d\n", (int)heap_allocatable_pages);
}
static int
heap_increment(rb_objspace_t *objspace, rb_heap_t *heap)
{
if (heap_allocatable_pages > 0) {
gc_report(1, objspace, "heap_increment: heap_pages_sorted_length: %d, heap_pages_inc: %d, heap->total_pages: %d\n",
(int)heap_pages_sorted_length, (int)heap_allocatable_pages, (int)heap->total_pages);
GC_ASSERT(heap_allocatable_pages + heap_eden->total_pages <= heap_pages_sorted_length);
GC_ASSERT(heap_allocated_pages <= heap_pages_sorted_length);
heap_assign_page(objspace, heap);
return TRUE;
}
return FALSE;
}
static void
heap_prepare(rb_objspace_t *objspace, rb_heap_t *heap)
{
GC_ASSERT(heap->free_pages == NULL);
if (is_lazy_sweeping(heap)) {
gc_sweep_continue(objspace, heap);
}
else if (is_incremental_marking(objspace)) {
gc_marks_continue(objspace, heap);
}
if (heap->free_pages == NULL &&
(will_be_incremental_marking(objspace) || heap_increment(objspace, heap) == FALSE) &&
gc_start(objspace, GPR_FLAG_NEWOBJ) == FALSE) {
rb_memerror();
}
}
static RVALUE *
heap_get_freeobj_from_next_freepage(rb_objspace_t *objspace, rb_heap_t *heap)
{
struct heap_page *page;
RVALUE *p;
while (heap->free_pages == NULL) {
heap_prepare(objspace, heap);
}
page = heap->free_pages;
heap->free_pages = page->free_next;
heap->using_page = page;
GC_ASSERT(page->free_slots != 0);
asan_unpoison_memory_region(&page->freelist, sizeof(RVALUE*), false);
p = page->freelist;
page->freelist = NULL;
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
page->free_slots = 0;
asan_unpoison_object((VALUE)p, true);
return p;
}
static inline VALUE
heap_get_freeobj_head(rb_objspace_t *objspace, rb_heap_t *heap)
{
RVALUE *p = heap->freelist;
if (LIKELY(p != NULL)) {
heap->freelist = p->as.free.next;
}
asan_unpoison_object((VALUE)p, true);
return (VALUE)p;
}
static inline VALUE
heap_get_freeobj(rb_objspace_t *objspace, rb_heap_t *heap)
{
RVALUE *p = heap->freelist;
while (1) {
if (LIKELY(p != NULL)) {
asan_unpoison_object((VALUE)p, true);
heap->freelist = p->as.free.next;
return (VALUE)p;
}
else {
p = heap_get_freeobj_from_next_freepage(objspace, heap);
}
}
}
void
rb_objspace_set_event_hook(const rb_event_flag_t event)
{
rb_objspace_t *objspace = &rb_objspace;
objspace->hook_events = event & RUBY_INTERNAL_EVENT_OBJSPACE_MASK;
objspace->flags.has_hook = (objspace->hook_events != 0);
}
static void
gc_event_hook_body(rb_execution_context_t *ec, rb_objspace_t *objspace, const rb_event_flag_t event, VALUE data)
{
const VALUE *pc = ec->cfp->pc;
if (pc && VM_FRAME_RUBYFRAME_P(ec->cfp)) {
/* increment PC because source line is calculated with PC-1 */
ec->cfp->pc++;
}
EXEC_EVENT_HOOK(ec, event, ec->cfp->self, 0, 0, 0, data);
ec->cfp->pc = pc;
}
#define gc_event_hook_available_p(objspace) ((objspace)->flags.has_hook)
#define gc_event_hook_needed_p(objspace, event) ((objspace)->hook_events & (event))
#define gc_event_hook(objspace, event, data) do { \
if (UNLIKELY(gc_event_hook_needed_p(objspace, event))) { \
gc_event_hook_body(GET_EC(), (objspace), (event), (data)); \
} \
} while (0)
static inline VALUE
newobj_init(VALUE klass, VALUE flags, VALUE v1, VALUE v2, VALUE v3, int wb_protected, rb_objspace_t *objspace, VALUE obj)
{
#if !__has_feature(memory_sanitizer)
GC_ASSERT(BUILTIN_TYPE(obj) == T_NONE);
GC_ASSERT((flags & FL_WB_PROTECTED) == 0);
#endif
/* OBJSETUP */
RBASIC(obj)->flags = flags;
RBASIC_SET_CLASS_RAW(obj, klass);
RANY(obj)->as.values.v1 = v1;
RANY(obj)->as.values.v2 = v2;
RANY(obj)->as.values.v3 = v3;
#if RGENGC_CHECK_MODE
GC_ASSERT(RVALUE_MARKED(obj) == FALSE);
GC_ASSERT(RVALUE_MARKING(obj) == FALSE);
GC_ASSERT(RVALUE_OLD_P(obj) == FALSE);
GC_ASSERT(RVALUE_WB_UNPROTECTED(obj) == FALSE);
if (flags & FL_PROMOTED1) {
if (RVALUE_AGE(obj) != 2) rb_bug("newobj: %s of age (%d) != 2.", obj_info(obj), RVALUE_AGE(obj));
}
else {
if (RVALUE_AGE(obj) > 0) rb_bug("newobj: %s of age (%d) > 0.", obj_info(obj), RVALUE_AGE(obj));
}
if (rgengc_remembered(objspace, (VALUE)obj)) rb_bug("newobj: %s is remembered.", obj_info(obj));
#endif
#if USE_RGENGC
if (UNLIKELY(wb_protected == FALSE)) {
MARK_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS(obj), obj);
}
#endif
#if RGENGC_PROFILE
if (wb_protected) {
objspace->profile.total_generated_normal_object_count++;
#if RGENGC_PROFILE >= 2
objspace->profile.generated_normal_object_count_types[BUILTIN_TYPE(obj)]++;
#endif
}
else {
objspace->profile.total_generated_shady_object_count++;
#if RGENGC_PROFILE >= 2
objspace->profile.generated_shady_object_count_types[BUILTIN_TYPE(obj)]++;
#endif
}
#endif
#if GC_DEBUG
RANY(obj)->file = rb_source_location_cstr(&RANY(obj)->line);
GC_ASSERT(!SPECIAL_CONST_P(obj)); /* check alignment */
#endif
objspace->total_allocated_objects++;
gc_report(5, objspace, "newobj: %s\n", obj_info(obj));
#if RGENGC_OLD_NEWOBJ_CHECK > 0
{
static int newobj_cnt = RGENGC_OLD_NEWOBJ_CHECK;
if (!is_incremental_marking(objspace) &&
flags & FL_WB_PROTECTED && /* do not promote WB unprotected objects */
! RB_TYPE_P(obj, T_ARRAY)) { /* array.c assumes that allocated objects are new */
if (--newobj_cnt == 0) {
newobj_cnt = RGENGC_OLD_NEWOBJ_CHECK;
gc_mark_set(objspace, obj);
RVALUE_AGE_SET_OLD(objspace, obj);
rb_gc_writebarrier_remember(obj);
}
}
}
#endif
check_rvalue_consistency(obj);
return obj;
}
static inline VALUE
newobj_slowpath(VALUE klass, VALUE flags, VALUE v1, VALUE v2, VALUE v3, rb_objspace_t *objspace, int wb_protected)
{
VALUE obj;
if (UNLIKELY(during_gc || ruby_gc_stressful)) {
if (during_gc) {
dont_gc = 1;
during_gc = 0;
rb_bug("object allocation during garbage collection phase");
}
if (ruby_gc_stressful) {
if (!garbage_collect(objspace, GPR_FLAG_NEWOBJ)) {
rb_memerror();
}
}
}
obj = heap_get_freeobj(objspace, heap_eden);
newobj_init(klass, flags, v1, v2, v3, wb_protected, objspace, obj);
gc_event_hook(objspace, RUBY_INTERNAL_EVENT_NEWOBJ, obj);
return obj;
}
NOINLINE(static VALUE newobj_slowpath_wb_protected(VALUE klass, VALUE flags, VALUE v1, VALUE v2, VALUE v3, rb_objspace_t *objspace));
NOINLINE(static VALUE newobj_slowpath_wb_unprotected(VALUE klass, VALUE flags, VALUE v1, VALUE v2, VALUE v3, rb_objspace_t *objspace));
static VALUE
newobj_slowpath_wb_protected(VALUE klass, VALUE flags, VALUE v1, VALUE v2, VALUE v3, rb_objspace_t *objspace)
{
return newobj_slowpath(klass, flags, v1, v2, v3, objspace, TRUE);
}
static VALUE
newobj_slowpath_wb_unprotected(VALUE klass, VALUE flags, VALUE v1, VALUE v2, VALUE v3, rb_objspace_t *objspace)
{
return newobj_slowpath(klass, flags, v1, v2, v3, objspace, FALSE);
}
static inline VALUE
newobj_of(VALUE klass, VALUE flags, VALUE v1, VALUE v2, VALUE v3, int wb_protected)
{
rb_objspace_t *objspace = &rb_objspace;
VALUE obj;
RB_DEBUG_COUNTER_INC(obj_newobj);
(void)RB_DEBUG_COUNTER_INC_IF(obj_newobj_wb_unprotected, !wb_protected);
#if GC_DEBUG_STRESS_TO_CLASS
if (UNLIKELY(stress_to_class)) {
long i, cnt = RARRAY_LEN(stress_to_class);
for (i = 0; i < cnt; ++i) {
if (klass == RARRAY_AREF(stress_to_class, i)) rb_memerror();
}
}
#endif
if (!(during_gc ||
ruby_gc_stressful ||
gc_event_hook_available_p(objspace)) &&
(obj = heap_get_freeobj_head(objspace, heap_eden)) != Qfalse) {
return newobj_init(klass, flags, v1, v2, v3, wb_protected, objspace, obj);
}
else {
RB_DEBUG_COUNTER_INC(obj_newobj_slowpath);
return wb_protected ?
newobj_slowpath_wb_protected(klass, flags, v1, v2, v3, objspace) :
newobj_slowpath_wb_unprotected(klass, flags, v1, v2, v3, objspace);
}
}
VALUE
rb_wb_unprotected_newobj_of(VALUE klass, VALUE flags)
{
GC_ASSERT((flags & FL_WB_PROTECTED) == 0);
return newobj_of(klass, flags, 0, 0, 0, FALSE);
}
VALUE
rb_wb_protected_newobj_of(VALUE klass, VALUE flags)
{
GC_ASSERT((flags & FL_WB_PROTECTED) == 0);
return newobj_of(klass, flags, 0, 0, 0, TRUE);
}
/* for compatibility */
VALUE
rb_newobj(void)
{
return newobj_of(0, T_NONE, 0, 0, 0, FALSE);
}
VALUE
rb_newobj_of(VALUE klass, VALUE flags)
{
return newobj_of(klass, flags & ~FL_WB_PROTECTED, 0, 0, 0, flags & FL_WB_PROTECTED);
}
#define UNEXPECTED_NODE(func) \
rb_bug(#func"(): GC does not handle T_NODE 0x%x(%p) 0x%"PRIxVALUE, \
BUILTIN_TYPE(obj), (void*)(obj), RBASIC(obj)->flags)
#undef rb_imemo_new
VALUE
rb_imemo_new(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0)
{
VALUE flags = T_IMEMO | (type << FL_USHIFT);
return newobj_of(v0, flags, v1, v2, v3, TRUE);
}
static VALUE
rb_imemo_tmpbuf_new(VALUE v1, VALUE v2, VALUE v3, VALUE v0)
{
VALUE flags = T_IMEMO | (imemo_tmpbuf << FL_USHIFT);
return newobj_of(v0, flags, v1, v2, v3, FALSE);
}
VALUE
rb_imemo_tmpbuf_auto_free_maybe_mark_buffer(void *buf, size_t cnt)
{
return rb_imemo_tmpbuf_new((VALUE)buf, 0, (VALUE)cnt, 0);
}
rb_imemo_tmpbuf_t *
rb_imemo_tmpbuf_parser_heap(void *buf, rb_imemo_tmpbuf_t *old_heap, size_t cnt)
{
return (rb_imemo_tmpbuf_t *)rb_imemo_tmpbuf_new((VALUE)buf, (VALUE)old_heap, (VALUE)cnt, 0);
}
static size_t
imemo_memsize(VALUE obj)
{
size_t size = 0;
switch (imemo_type(obj)) {
case imemo_ment:
size += sizeof(RANY(obj)->as.imemo.ment.def);
break;
case imemo_iseq:
size += rb_iseq_memsize((rb_iseq_t *)obj);
break;
case imemo_env:
size += RANY(obj)->as.imemo.env.env_size * sizeof(VALUE);
break;
case imemo_tmpbuf:
size += RANY(obj)->as.imemo.alloc.cnt * sizeof(VALUE);
break;
case imemo_ast:
size += rb_ast_memsize(&RANY(obj)->as.imemo.ast);
break;
case imemo_cref:
case imemo_svar:
case imemo_throw_data:
case imemo_ifunc:
case imemo_memo:
case imemo_parser_strterm:
break;
default:
/* unreachable */
break;
}
return size;
}
#if IMEMO_DEBUG
VALUE
rb_imemo_new_debug(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0, const char *file, int line)
{
VALUE memo = rb_imemo_new(type, v1, v2, v3, v0);
fprintf(stderr, "memo %p (type: %d) @ %s:%d\n", (void *)memo, imemo_type(memo), file, line);
return memo;
}
#endif
VALUE
rb_data_object_wrap(VALUE klass, void *datap, RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree)
{
if (klass) Check_Type(klass, T_CLASS);
return newobj_of(klass, T_DATA, (VALUE)dmark, (VALUE)dfree, (VALUE)datap, FALSE);
}
#undef rb_data_object_alloc
RUBY_ALIAS_FUNCTION(rb_data_object_alloc(VALUE klass, void *datap,
RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree),
rb_data_object_wrap, (klass, datap, dmark, dfree))
VALUE
rb_data_object_zalloc(VALUE klass, size_t size, RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree)
{
VALUE obj = rb_data_object_wrap(klass, 0, dmark, dfree);
DATA_PTR(obj) = xcalloc(1, size);
return obj;
}
VALUE
rb_data_typed_object_wrap(VALUE klass, void *datap, const rb_data_type_t *type)
{
if (klass) Check_Type(klass, T_CLASS);
return newobj_of(klass, T_DATA, (VALUE)type, (VALUE)1, (VALUE)datap, type->flags & RUBY_FL_WB_PROTECTED);
}
#undef rb_data_typed_object_alloc
RUBY_ALIAS_FUNCTION(rb_data_typed_object_alloc(VALUE klass, void *datap,
const rb_data_type_t *type),
rb_data_typed_object_wrap, (klass, datap, type))
VALUE
rb_data_typed_object_zalloc(VALUE klass, size_t size, const rb_data_type_t *type)
{
VALUE obj = rb_data_typed_object_wrap(klass, 0, type);
DATA_PTR(obj) = xcalloc(1, size);
return obj;
}
size_t
rb_objspace_data_type_memsize(VALUE obj)
{
if (RTYPEDDATA_P(obj)) {
const rb_data_type_t *type = RTYPEDDATA_TYPE(obj);
const void *ptr = RTYPEDDATA_DATA(obj);
if (ptr && type->function.dsize) {
return type->function.dsize(ptr);
}
}
return 0;
}
const char *
rb_objspace_data_type_name(VALUE obj)
{
if (RTYPEDDATA_P(obj)) {
return RTYPEDDATA_TYPE(obj)->wrap_struct_name;
}
else {
return 0;
}
}
PUREFUNC(static inline int is_pointer_to_heap(rb_objspace_t *objspace, void *ptr);)
static inline int
is_pointer_to_heap(rb_objspace_t *objspace, void *ptr)
{
register RVALUE *p = RANY(ptr);
register struct heap_page *page;
register size_t hi, lo, mid;
RB_DEBUG_COUNTER_INC(gc_isptr_trial);
if (p < heap_pages_lomem || p > heap_pages_himem) return FALSE;
RB_DEBUG_COUNTER_INC(gc_isptr_range);
if ((VALUE)p % sizeof(RVALUE) != 0) return FALSE;
RB_DEBUG_COUNTER_INC(gc_isptr_align);
/* check if p looks like a pointer using bsearch*/
lo = 0;
hi = heap_allocated_pages;
while (lo < hi) {
mid = (lo + hi) / 2;
page = heap_pages_sorted[mid];
if (page->start <= p) {
if (p < page->start + page->total_slots) {
RB_DEBUG_COUNTER_INC(gc_isptr_maybe);
if (page->flags.in_tomb) {
return FALSE;
}
else {
return TRUE;
}
}
lo = mid + 1;
}
else {
hi = mid;
}
}
return FALSE;
}
static enum rb_id_table_iterator_result
free_const_entry_i(VALUE value, void *data)
{
rb_const_entry_t *ce = (rb_const_entry_t *)value;
xfree(ce);
return ID_TABLE_CONTINUE;
}
void
rb_free_const_table(struct rb_id_table *tbl)
{
rb_id_table_foreach_values(tbl, free_const_entry_i, 0);
rb_id_table_free(tbl);
}
static inline void
make_zombie(rb_objspace_t *objspace, VALUE obj, void (*dfree)(void *), void *data)
{
struct RZombie *zombie = RZOMBIE(obj);
zombie->basic.flags = T_ZOMBIE | (zombie->basic.flags & FL_SEEN_OBJ_ID);
zombie->dfree = dfree;
zombie->data = data;
zombie->next = heap_pages_deferred_final;
heap_pages_deferred_final = (VALUE)zombie;
}
static inline void
make_io_zombie(rb_objspace_t *objspace, VALUE obj)
{
rb_io_t *fptr = RANY(obj)->as.file.fptr;
make_zombie(objspace, obj, (void (*)(void*))rb_io_fptr_finalize, fptr);
}
static void
obj_free_object_id(rb_objspace_t *objspace, VALUE obj)
{
VALUE id;
GC_ASSERT(FL_TEST(obj, FL_SEEN_OBJ_ID));
FL_UNSET(obj, FL_SEEN_OBJ_ID);
if (st_delete(objspace->obj_to_id_tbl, (st_data_t *)&obj, &id)) {
GC_ASSERT(id);
st_delete(objspace->id_to_obj_tbl, (st_data_t *)&id, NULL);
}
else {
rb_bug("Object ID seen, but not in mapping table: %s\n", obj_info(obj));
}
}
static int
obj_free(rb_objspace_t *objspace, VALUE obj)
{
RB_DEBUG_COUNTER_INC(obj_free);
gc_event_hook(objspace, RUBY_INTERNAL_EVENT_FREEOBJ, obj);
switch (BUILTIN_TYPE(obj)) {
case T_NIL:
case T_FIXNUM:
case T_TRUE:
case T_FALSE:
rb_bug("obj_free() called for broken object");
break;
}
if (FL_TEST(obj, FL_EXIVAR)) {
rb_free_generic_ivar((VALUE)obj);
FL_UNSET(obj, FL_EXIVAR);
}
if (FL_TEST(obj, FL_SEEN_OBJ_ID) && !FL_TEST(obj, FL_FINALIZE)) {
obj_free_object_id(objspace, obj);
}
#if USE_RGENGC
if (RVALUE_WB_UNPROTECTED(obj)) CLEAR_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS(obj), obj);
#if RGENGC_CHECK_MODE
#define CHECK(x) if (x(obj) != FALSE) rb_bug("obj_free: " #x "(%s) != FALSE", obj_info(obj))
CHECK(RVALUE_WB_UNPROTECTED);
CHECK(RVALUE_MARKED);
CHECK(RVALUE_MARKING);
CHECK(RVALUE_UNCOLLECTIBLE);
#undef CHECK
#endif
#endif
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
if ((RANY(obj)->as.basic.flags & ROBJECT_EMBED) ||
RANY(obj)->as.object.as.heap.ivptr == NULL) {
RB_DEBUG_COUNTER_INC(obj_obj_embed);
}
else if (ROBJ_TRANSIENT_P(obj)) {
RB_DEBUG_COUNTER_INC(obj_obj_transient);
}
else {
xfree(RANY(obj)->as.object.as.heap.ivptr);
RB_DEBUG_COUNTER_INC(obj_obj_ptr);
}
break;
case T_MODULE:
case T_CLASS:
mjit_remove_class_serial(RCLASS_SERIAL(obj));
rb_id_table_free(RCLASS_M_TBL(obj));
if (RCLASS_IV_TBL(obj)) {
st_free_table(RCLASS_IV_TBL(obj));
}
if (RCLASS_CONST_TBL(obj)) {
rb_free_const_table(RCLASS_CONST_TBL(obj));
}
if (RCLASS_IV_INDEX_TBL(obj)) {
st_free_table(RCLASS_IV_INDEX_TBL(obj));
}
if (RCLASS_EXT(obj)->subclasses) {
if (BUILTIN_TYPE(obj) == T_MODULE) {
rb_class_detach_module_subclasses(obj);
}
else {
rb_class_detach_subclasses(obj);
}
RCLASS_EXT(obj)->subclasses = NULL;
}
rb_class_remove_from_module_subclasses(obj);
rb_class_remove_from_super_subclasses(obj);
if (RANY(obj)->as.klass.ptr)
xfree(RANY(obj)->as.klass.ptr);
RANY(obj)->as.klass.ptr = NULL;
(void)RB_DEBUG_COUNTER_INC_IF(obj_module_ptr, BUILTIN_TYPE(obj) == T_MODULE);
(void)RB_DEBUG_COUNTER_INC_IF(obj_class_ptr, BUILTIN_TYPE(obj) == T_CLASS);
break;
case T_STRING:
rb_str_free(obj);
break;
case T_ARRAY:
rb_ary_free(obj);
break;
case T_HASH:
#if USE_DEBUG_COUNTER
switch RHASH_SIZE(obj) {
case 0:
RB_DEBUG_COUNTER_INC(obj_hash_empty);
break;
case 1:
RB_DEBUG_COUNTER_INC(obj_hash_1);
break;
case 2:
RB_DEBUG_COUNTER_INC(obj_hash_2);
break;
case 3:
RB_DEBUG_COUNTER_INC(obj_hash_3);
break;
case 4:
RB_DEBUG_COUNTER_INC(obj_hash_4);
break;
case 5:
case 6:
case 7:
case 8:
RB_DEBUG_COUNTER_INC(obj_hash_5_8);
break;
default:
GC_ASSERT(RHASH_SIZE(obj) > 8);
RB_DEBUG_COUNTER_INC(obj_hash_g8);
}
if (RHASH_AR_TABLE_P(obj)) {
if (RHASH_AR_TABLE(obj) == NULL) {
RB_DEBUG_COUNTER_INC(obj_hash_null);
}
else {
RB_DEBUG_COUNTER_INC(obj_hash_ar);
}
}
else {
RB_DEBUG_COUNTER_INC(obj_hash_st);
}
#endif
if (/* RHASH_AR_TABLE_P(obj) */ !FL_TEST_RAW(obj, RHASH_ST_TABLE_FLAG)) {
struct ar_table_struct *tab = RHASH(obj)->as.ar;
if (tab) {
if (RHASH_TRANSIENT_P(obj)) {
RB_DEBUG_COUNTER_INC(obj_hash_transient);
}
else {
ruby_xfree(tab);
}
}
}
else {
GC_ASSERT(RHASH_ST_TABLE_P(obj));
st_free_table(RHASH(obj)->as.st);
}
break;
case T_REGEXP:
if (RANY(obj)->as.regexp.ptr) {
onig_free(RANY(obj)->as.regexp.ptr);
RB_DEBUG_COUNTER_INC(obj_regexp_ptr);
}
break;
case T_DATA:
if (DATA_PTR(obj)) {
int free_immediately = FALSE;
void (*dfree)(void *);
void *data = DATA_PTR(obj);
if (RTYPEDDATA_P(obj)) {
free_immediately = (RANY(obj)->as.typeddata.type->flags & RUBY_TYPED_FREE_IMMEDIATELY) != 0;
dfree = RANY(obj)->as.typeddata.type->function.dfree;
if (0 && free_immediately == 0) {
/* to expose non-free-immediate T_DATA */
fprintf(stderr, "not immediate -> %s\n", RANY(obj)->as.typeddata.type->wrap_struct_name);
}
}
else {
dfree = RANY(obj)->as.data.dfree;
}
if (dfree) {
if (dfree == RUBY_DEFAULT_FREE) {
xfree(data);
RB_DEBUG_COUNTER_INC(obj_data_xfree);
}
else if (free_immediately) {
(*dfree)(data);
RB_DEBUG_COUNTER_INC(obj_data_imm_free);
}
else {
make_zombie(objspace, obj, dfree, data);
RB_DEBUG_COUNTER_INC(obj_data_zombie);
return 1;
}
}
else {
RB_DEBUG_COUNTER_INC(obj_data_empty);
}
}
break;
case T_MATCH:
if (RANY(obj)->as.match.rmatch) {
struct rmatch *rm = RANY(obj)->as.match.rmatch;
#if USE_DEBUG_COUNTER
if (rm->regs.num_regs >= 8) {
RB_DEBUG_COUNTER_INC(obj_match_ge8);
}
else if (rm->regs.num_regs >= 4) {
RB_DEBUG_COUNTER_INC(obj_match_ge4);
}
else if (rm->regs.num_regs >= 1) {
RB_DEBUG_COUNTER_INC(obj_match_under4);
}
#endif
onig_region_free(&rm->regs, 0);
if (rm->char_offset)
xfree(rm->char_offset);
xfree(rm);
RB_DEBUG_COUNTER_INC(obj_match_ptr);
}
break;
case T_FILE:
if (RANY(obj)->as.file.fptr) {
make_io_zombie(objspace, obj);
RB_DEBUG_COUNTER_INC(obj_file_ptr);
return 1;
}
break;
case T_RATIONAL:
case T_COMPLEX:
case T_MOVED:
break;
case T_ICLASS:
/* Basically , T_ICLASS shares table with the module */
if (FL_TEST(obj, RICLASS_IS_ORIGIN)) {
rb_id_table_free(RCLASS_M_TBL(obj));
}
if (RCLASS_CALLABLE_M_TBL(obj) != NULL) {
rb_id_table_free(RCLASS_CALLABLE_M_TBL(obj));
}
if (RCLASS_EXT(obj)->subclasses) {
rb_class_detach_subclasses(obj);
RCLASS_EXT(obj)->subclasses = NULL;
}
rb_class_remove_from_module_subclasses(obj);
rb_class_remove_from_super_subclasses(obj);
xfree(RANY(obj)->as.klass.ptr);
RANY(obj)->as.klass.ptr = NULL;
RB_DEBUG_COUNTER_INC(obj_iclass_ptr);
break;
case T_FLOAT:
break;
case T_BIGNUM:
if (!(RBASIC(obj)->flags & BIGNUM_EMBED_FLAG) && BIGNUM_DIGITS(obj)) {
xfree(BIGNUM_DIGITS(obj));
RB_DEBUG_COUNTER_INC(obj_bignum_ptr);
}
break;
case T_NODE:
UNEXPECTED_NODE(obj_free);
break;
case T_STRUCT:
if ((RBASIC(obj)->flags & RSTRUCT_EMBED_LEN_MASK) ||
RANY(obj)->as.rstruct.as.heap.ptr == NULL) {
RB_DEBUG_COUNTER_INC(obj_struct_embed);
}
else if (RSTRUCT_TRANSIENT_P(obj)) {
RB_DEBUG_COUNTER_INC(obj_struct_transient);
}
else {
xfree((void *)RANY(obj)->as.rstruct.as.heap.ptr);
RB_DEBUG_COUNTER_INC(obj_struct_ptr);
}
break;
case T_SYMBOL:
{
rb_gc_free_dsymbol(obj);
RB_DEBUG_COUNTER_INC(obj_symbol);
}
break;
case T_IMEMO:
switch (imemo_type(obj)) {
case imemo_ment:
rb_free_method_entry(&RANY(obj)->as.imemo.ment);
RB_DEBUG_COUNTER_INC(obj_imemo_ment);
break;
case imemo_iseq:
rb_iseq_free(&RANY(obj)->as.imemo.iseq);
RB_DEBUG_COUNTER_INC(obj_imemo_iseq);
break;
case imemo_env:
GC_ASSERT(VM_ENV_ESCAPED_P(RANY(obj)->as.imemo.env.ep));
xfree((VALUE *)RANY(obj)->as.imemo.env.env);
RB_DEBUG_COUNTER_INC(obj_imemo_env);
break;
case imemo_tmpbuf:
xfree(RANY(obj)->as.imemo.alloc.ptr);
RB_DEBUG_COUNTER_INC(obj_imemo_tmpbuf);
break;
case imemo_ast:
rb_ast_free(&RANY(obj)->as.imemo.ast);
RB_DEBUG_COUNTER_INC(obj_imemo_ast);
break;
case imemo_cref:
RB_DEBUG_COUNTER_INC(obj_imemo_cref);
break;
case imemo_svar:
RB_DEBUG_COUNTER_INC(obj_imemo_svar);
break;
case imemo_throw_data:
RB_DEBUG_COUNTER_INC(obj_imemo_throw_data);
break;
case imemo_ifunc:
RB_DEBUG_COUNTER_INC(obj_imemo_ifunc);
break;
case imemo_memo:
RB_DEBUG_COUNTER_INC(obj_imemo_memo);
break;
case imemo_parser_strterm:
RB_DEBUG_COUNTER_INC(obj_imemo_parser_strterm);
break;
default:
/* unreachable */
break;
}
return 0;
default:
rb_bug("gc_sweep(): unknown data type 0x%x(%p) 0x%"PRIxVALUE,
BUILTIN_TYPE(obj), (void*)obj, RBASIC(obj)->flags);
}
if (FL_TEST(obj, FL_FINALIZE)) {
make_zombie(objspace, obj, 0, 0);
return 1;
}
else {
return 0;
}
}
#define OBJ_ID_INCREMENT (sizeof(RVALUE) / 2)
#define OBJ_ID_INITIAL (OBJ_ID_INCREMENT * 2)
static int
object_id_cmp(st_data_t x, st_data_t y)
{
if (RB_TYPE_P(x, T_BIGNUM)) {
return !rb_big_eql(x, y);
} else {
return x != y;
}
}
static st_index_t
object_id_hash(st_data_t n)
{
if (RB_TYPE_P(n, T_BIGNUM)) {
return FIX2LONG(rb_big_hash(n));
} else {
return st_numhash(n);
}
}
static const struct st_hash_type object_id_hash_type = {
object_id_cmp,
object_id_hash,
};
void
Init_heap(void)
{
rb_objspace_t *objspace = &rb_objspace;
objspace->next_object_id = INT2FIX(OBJ_ID_INITIAL);
objspace->id_to_obj_tbl = st_init_table(&object_id_hash_type);
objspace->obj_to_id_tbl = st_init_numtable();
#if RGENGC_ESTIMATE_OLDMALLOC
objspace->rgengc.oldmalloc_increase_limit = gc_params.oldmalloc_limit_min;
#endif
heap_add_pages(objspace, heap_eden, gc_params.heap_init_slots / HEAP_PAGE_OBJ_LIMIT);
init_mark_stack(&objspace->mark_stack);
objspace->profile.invoke_time = getrusage_time();
finalizer_table = st_init_numtable();
}
void
Init_gc_stress(void)
{
rb_objspace_t *objspace = &rb_objspace;
gc_stress_set(objspace, ruby_initial_gc_stress);
}
typedef int each_obj_callback(void *, void *, size_t, void *);
static void objspace_each_objects(rb_objspace_t *objspace, each_obj_callback *callback, void *data);
static void objspace_reachable_objects_from_root(rb_objspace_t *, void (func)(const char *, VALUE, void *), void *);
struct each_obj_args {
rb_objspace_t *objspace;
each_obj_callback *callback;
void *data;
};
static void
objspace_each_objects_without_setup(rb_objspace_t *objspace, each_obj_callback *callback, void *data)
{
size_t i;
struct heap_page *page;
RVALUE *pstart = NULL, *pend;
i = 0;
while (i < heap_allocated_pages) {
while (0 < i && pstart < heap_pages_sorted[i-1]->start) i--;
while (i < heap_allocated_pages && heap_pages_sorted[i]->start <= pstart) i++;
if (heap_allocated_pages <= i) break;
page = heap_pages_sorted[i];
pstart = page->start;
pend = pstart + page->total_slots;
if ((*callback)(pstart, pend, sizeof(RVALUE), data)) {
break;
}
}
}
static VALUE
objspace_each_objects_protected(VALUE arg)
{
struct each_obj_args *args = (struct each_obj_args *)arg;
objspace_each_objects_without_setup(args->objspace, args->callback, args->data);
return Qnil;
}
static VALUE
incremental_enable(VALUE _)
{
rb_objspace_t *objspace = &rb_objspace;
objspace->flags.dont_incremental = FALSE;
return Qnil;
}
/*
* rb_objspace_each_objects() is special C API to walk through
* Ruby object space. This C API is too difficult to use it.
* To be frank, you should not use it. Or you need to read the
* source code of this function and understand what this function does.
*
* 'callback' will be called several times (the number of heap page,
* at current implementation) with:
* vstart: a pointer to the first living object of the heap_page.
* vend: a pointer to next to the valid heap_page area.
* stride: a distance to next VALUE.
*
* If callback() returns non-zero, the iteration will be stopped.
*
* This is a sample callback code to iterate liveness objects:
*
* int
* sample_callback(void *vstart, void *vend, int stride, void *data) {
* VALUE v = (VALUE)vstart;
* for (; v != (VALUE)vend; v += stride) {
* if (RBASIC(v)->flags) { // liveness check
* // do something with live object 'v'
* }
* return 0; // continue to iteration
* }
*
* Note: 'vstart' is not a top of heap_page. This point the first
* living object to grasp at least one object to avoid GC issue.
* This means that you can not walk through all Ruby object page
* including freed object page.
*
* Note: On this implementation, 'stride' is same as sizeof(RVALUE).
* However, there are possibilities to pass variable values with
* 'stride' with some reasons. You must use stride instead of
* use some constant value in the iteration.
*/
void
rb_objspace_each_objects(each_obj_callback *callback, void *data)
{
objspace_each_objects(&rb_objspace, callback, data);
}
static void
objspace_each_objects(rb_objspace_t *objspace, each_obj_callback *callback, void *data)
{
int prev_dont_incremental = objspace->flags.dont_incremental;
gc_rest(objspace);
objspace->flags.dont_incremental = TRUE;
if (prev_dont_incremental) {
objspace_each_objects_without_setup(objspace, callback, data);
}
else {
struct each_obj_args args = {objspace, callback, data};
rb_ensure(objspace_each_objects_protected, (VALUE)&args, incremental_enable, Qnil);
}
}
void
rb_objspace_each_objects_without_setup(each_obj_callback *callback, void *data)
{
objspace_each_objects_without_setup(&rb_objspace, callback, data);
}
struct os_each_struct {
size_t num;
VALUE of;
};
static int
internal_object_p(VALUE obj)
{
RVALUE *p = (RVALUE *)obj;
void *ptr = __asan_region_is_poisoned(p, SIZEOF_VALUE);
asan_unpoison_object(obj, false);
bool used_p = p->as.basic.flags;
if (used_p) {
switch (BUILTIN_TYPE(p)) {
case T_NODE:
UNEXPECTED_NODE(internal_object_p);
break;
case T_NONE:
case T_MOVED:
case T_IMEMO:
case T_ICLASS:
case T_ZOMBIE:
break;
case T_CLASS:
if (!p->as.basic.klass) break;
if (FL_TEST(obj, FL_SINGLETON)) {
return rb_singleton_class_internal_p(obj);
}
return 0;
default:
if (!p->as.basic.klass) break;
return 0;
}
}
if (ptr || ! used_p) {
asan_poison_object(obj);
}
return 1;
}
int
rb_objspace_internal_object_p(VALUE obj)
{
return internal_object_p(obj);
}
static int
os_obj_of_i(void *vstart, void *vend, size_t stride, void *data)
{
struct os_each_struct *oes = (struct os_each_struct *)data;
RVALUE *p = (RVALUE *)vstart, *pend = (RVALUE *)vend;
for (; p != pend; p++) {
volatile VALUE v = (VALUE)p;
if (!internal_object_p(v)) {
if (!oes->of || rb_obj_is_kind_of(v, oes->of)) {
rb_yield(v);
oes->num++;
}
}
}
return 0;
}
static VALUE
os_obj_of(VALUE of)
{
struct os_each_struct oes;
oes.num = 0;
oes.of = of;
rb_objspace_each_objects(os_obj_of_i, &oes);
return SIZET2NUM(oes.num);
}
/*
* call-seq:
* ObjectSpace.each_object([module]) {|obj| ... } -> integer
* ObjectSpace.each_object([module]) -> an_enumerator
*
* Calls the block once for each living, nonimmediate object in this
* Ruby process. If <i>module</i> is specified, calls the block
* for only those classes or modules that match (or are a subclass of)
* <i>module</i>. Returns the number of objects found. Immediate
* objects (<code>Fixnum</code>s, <code>Symbol</code>s
* <code>true</code>, <code>false</code>, and <code>nil</code>) are
* never returned. In the example below, #each_object returns both
* the numbers we defined and several constants defined in the Math
* module.
*
* If no block is given, an enumerator is returned instead.
*
* a = 102.7
* b = 95 # Won't be returned
* c = 12345678987654321
* count = ObjectSpace.each_object(Numeric) {|x| p x }
* puts "Total count: #{count}"
*
* <em>produces:</em>
*
* 12345678987654321
* 102.7
* 2.71828182845905
* 3.14159265358979
* 2.22044604925031e-16
* 1.7976931348623157e+308
* 2.2250738585072e-308
* Total count: 7
*
*/
static VALUE
os_each_obj(int argc, VALUE *argv, VALUE os)
{
VALUE of;
of = (!rb_check_arity(argc, 0, 1) ? 0 : argv[0]);
RETURN_ENUMERATOR(os, 1, &of);
return os_obj_of(of);
}
/*
* call-seq:
* ObjectSpace.undefine_finalizer(obj)
*
* Removes all finalizers for <i>obj</i>.
*
*/
static VALUE
undefine_final(VALUE os, VALUE obj)
{
return rb_undefine_finalizer(obj);
}
VALUE
rb_undefine_finalizer(VALUE obj)
{
rb_objspace_t *objspace = &rb_objspace;
st_data_t data = obj;
rb_check_frozen(obj);
st_delete(finalizer_table, &data, 0);
FL_UNSET(obj, FL_FINALIZE);
return obj;
}
static void
should_be_callable(VALUE block)
{
if (!rb_obj_respond_to(block, idCall, TRUE)) {
rb_raise(rb_eArgError, "wrong type argument %"PRIsVALUE" (should be callable)",
rb_obj_class(block));
}
}
static void
should_be_finalizable(VALUE obj)
{
if (!FL_ABLE(obj)) {
rb_raise(rb_eArgError, "cannot define finalizer for %s",
rb_obj_classname(obj));
}
rb_check_frozen(obj);
}
/*
* call-seq:
* ObjectSpace.define_finalizer(obj, aProc=proc())
*
* Adds <i>aProc</i> as a finalizer, to be called after <i>obj</i>
* was destroyed. The object ID of the <i>obj</i> will be passed
* as an argument to <i>aProc</i>. If <i>aProc</i> is a lambda or
* method, make sure it can be called with a single argument.
*
*/
static VALUE
define_final(int argc, VALUE *argv, VALUE os)
{
VALUE obj, block;
rb_scan_args(argc, argv, "11", &obj, &block);
should_be_finalizable(obj);
if (argc == 1) {
block = rb_block_proc();
}
else {
should_be_callable(block);
}
return define_final0(obj, block);
}
static VALUE
define_final0(VALUE obj, VALUE block)
{
rb_objspace_t *objspace = &rb_objspace;
VALUE table;
st_data_t data;
RBASIC(obj)->flags |= FL_FINALIZE;
block = rb_ary_new3(2, INT2FIX(0), block);
OBJ_FREEZE(block);
if (st_lookup(finalizer_table, obj, &data)) {
table = (VALUE)data;
/* avoid duplicate block, table is usually small */
{
long len = RARRAY_LEN(table);
long i;
for (i = 0; i < len; i++) {
VALUE recv = RARRAY_AREF(table, i);
if (rb_funcall(recv, idEq, 1, block)) {
return recv;
}
}
}
rb_ary_push(table, block);
}
else {
table = rb_ary_new3(1, block);
RBASIC_CLEAR_CLASS(table);
st_add_direct(finalizer_table, obj, table);
}
return block;
}
VALUE
rb_define_finalizer(VALUE obj, VALUE block)
{
should_be_finalizable(obj);
should_be_callable(block);
return define_final0(obj, block);
}
void
rb_gc_copy_finalizer(VALUE dest, VALUE obj)
{
rb_objspace_t *objspace = &rb_objspace;
VALUE table;
st_data_t data;
if (!FL_TEST(obj, FL_FINALIZE)) return;
if (st_lookup(finalizer_table, obj, &data)) {
table = (VALUE)data;
st_insert(finalizer_table, dest, table);
}
FL_SET(dest, FL_FINALIZE);
}
static VALUE
run_single_final(VALUE final, VALUE objid)
{
const VALUE cmd = RARRAY_AREF(final, 1);
return rb_check_funcall(cmd, idCall, 1, &objid);
}
static void
run_finalizer(rb_objspace_t *objspace, VALUE obj, VALUE table)
{
long i;
enum ruby_tag_type state;
volatile struct {
VALUE errinfo;
VALUE objid;
rb_control_frame_t *cfp;
long finished;
} saved;
rb_execution_context_t * volatile ec = GET_EC();
#define RESTORE_FINALIZER() (\
ec->cfp = saved.cfp, \
rb_set_errinfo(saved.errinfo))
saved.errinfo = rb_errinfo();
saved.objid = rb_obj_id(obj);
saved.cfp = ec->cfp;
saved.finished = 0;
EC_PUSH_TAG(ec);
state = EC_EXEC_TAG();
if (state != TAG_NONE) {
++saved.finished; /* skip failed finalizer */
}
for (i = saved.finished;
RESTORE_FINALIZER(), i<RARRAY_LEN(table);
saved.finished = ++i) {
run_single_final(RARRAY_AREF(table, i), saved.objid);
}
EC_POP_TAG();
#undef RESTORE_FINALIZER
}
static void
run_final(rb_objspace_t *objspace, VALUE zombie)
{
st_data_t key, table;
if (RZOMBIE(zombie)->dfree) {
RZOMBIE(zombie)->dfree(RZOMBIE(zombie)->data);
}
key = (st_data_t)zombie;
if (st_delete(finalizer_table, &key, &table)) {
run_finalizer(objspace, zombie, (VALUE)table);
}
}
static void
finalize_list(rb_objspace_t *objspace, VALUE zombie)
{
while (zombie) {
VALUE next_zombie;
struct heap_page *page;
asan_unpoison_object(zombie, false);
next_zombie = RZOMBIE(zombie)->next;
page = GET_HEAP_PAGE(zombie);
run_final(objspace, zombie);
GC_ASSERT(BUILTIN_TYPE(zombie) == T_ZOMBIE);
if (FL_TEST(zombie, FL_SEEN_OBJ_ID)) {
obj_free_object_id(objspace, zombie);
}
RZOMBIE(zombie)->basic.flags = 0;
if (LIKELY(heap_pages_final_slots)) heap_pages_final_slots--;
page->final_slots--;
page->free_slots++;
heap_page_add_freeobj(objspace, GET_HEAP_PAGE(zombie), zombie);
objspace->profile.total_freed_objects++;
zombie = next_zombie;
}
}
static void
finalize_deferred(rb_objspace_t *objspace)
{
VALUE zombie;
while ((zombie = ATOMIC_VALUE_EXCHANGE(heap_pages_deferred_final, 0)) != 0) {
finalize_list(objspace, zombie);
}
}
static void
gc_finalize_deferred(void *dmy)
{
rb_objspace_t *objspace = dmy;
if (ATOMIC_EXCHANGE(finalizing, 1)) return;
finalize_deferred(objspace);
ATOMIC_SET(finalizing, 0);
}
static void
gc_finalize_deferred_register(rb_objspace_t *objspace)
{
if (rb_postponed_job_register_one(0, gc_finalize_deferred, objspace) == 0) {
rb_bug("gc_finalize_deferred_register: can't register finalizer.");
}
}
struct force_finalize_list {
VALUE obj;
VALUE table;
struct force_finalize_list *next;
};
static int
force_chain_object(st_data_t key, st_data_t val, st_data_t arg)
{
struct force_finalize_list **prev = (struct force_finalize_list **)arg;
struct force_finalize_list *curr = ALLOC(struct force_finalize_list);
curr->obj = key;
curr->table = val;
curr->next = *prev;
*prev = curr;
return ST_CONTINUE;
}
void
rb_objspace_call_finalizer(rb_objspace_t *objspace)
{
RVALUE *p, *pend;
size_t i;
#if RGENGC_CHECK_MODE >= 2
gc_verify_internal_consistency(objspace);
#endif
gc_rest(objspace);
if (ATOMIC_EXCHANGE(finalizing, 1)) return;
/* run finalizers */
finalize_deferred(objspace);
GC_ASSERT(heap_pages_deferred_final == 0);
gc_rest(objspace);
/* prohibit incremental GC */
objspace->flags.dont_incremental = 1;
/* force to run finalizer */
while (finalizer_table->num_entries) {
struct force_finalize_list *list = 0;
st_foreach(finalizer_table, force_chain_object, (st_data_t)&list);
while (list) {
struct force_finalize_list *curr = list;
st_data_t obj = (st_data_t)curr->obj;
run_finalizer(objspace, curr->obj, curr->table);
st_delete(finalizer_table, &obj, 0);
list = curr->next;
xfree(curr);
}
}
/* prohibit GC because force T_DATA finalizers can break an object graph consistency */
dont_gc = 1;
/* running data/file finalizers are part of garbage collection */
gc_enter(objspace, "rb_objspace_call_finalizer");
/* run data/file object's finalizers */
for (i = 0; i < heap_allocated_pages; i++) {
p = heap_pages_sorted[i]->start; pend = p + heap_pages_sorted[i]->total_slots;
while (p < pend) {
void *poisoned = asan_poisoned_object_p((VALUE)p);
asan_unpoison_object((VALUE)p, false);
switch (BUILTIN_TYPE(p)) {
case T_DATA:
if (!DATA_PTR(p) || !RANY(p)->as.data.dfree) break;
if (rb_obj_is_thread((VALUE)p)) break;
if (rb_obj_is_mutex((VALUE)p)) break;
if (rb_obj_is_fiber((VALUE)p)) break;
p->as.free.flags = 0;
if (RTYPEDDATA_P(p)) {
RDATA(p)->dfree = RANY(p)->as.typeddata.type->function.dfree;
}
if (RANY(p)->as.data.dfree == RUBY_DEFAULT_FREE) {
xfree(DATA_PTR(p));
}
else if (RANY(p)->as.data.dfree) {
make_zombie(objspace, (VALUE)p, RANY(p)->as.data.dfree, RANY(p)->as.data.data);
}
break;
case T_FILE:
if (RANY(p)->as.file.fptr) {
make_io_zombie(objspace, (VALUE)p);
}
break;
}
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE(p) == T_NONE);
asan_poison_object((VALUE)p);
}
p++;
}
}
gc_exit(objspace, "rb_objspace_call_finalizer");
if (heap_pages_deferred_final) {
finalize_list(objspace, heap_pages_deferred_final);
}
st_free_table(finalizer_table);
finalizer_table = 0;
ATOMIC_SET(finalizing, 0);
}
PUREFUNC(static inline int is_id_value(rb_objspace_t *objspace, VALUE ptr));
static inline int
is_id_value(rb_objspace_t *objspace, VALUE ptr)
{
if (!is_pointer_to_heap(objspace, (void *)ptr)) return FALSE;
if (BUILTIN_TYPE(ptr) > T_FIXNUM) return FALSE;
if (BUILTIN_TYPE(ptr) == T_ICLASS) return FALSE;
return TRUE;
}
static inline int
heap_is_swept_object(rb_objspace_t *objspace, rb_heap_t *heap, VALUE ptr)
{
struct heap_page *page = GET_HEAP_PAGE(ptr);
return page->flags.before_sweep ? FALSE : TRUE;
}
static inline int
is_swept_object(rb_objspace_t *objspace, VALUE ptr)
{
if (heap_is_swept_object(objspace, heap_eden, ptr)) {
return TRUE;
}
else {
return FALSE;
}
}
/* garbage objects will be collected soon. */
static inline int
is_garbage_object(rb_objspace_t *objspace, VALUE ptr)
{
if (!is_lazy_sweeping(heap_eden) ||
is_swept_object(objspace, ptr) ||
MARKED_IN_BITMAP(GET_HEAP_MARK_BITS(ptr), ptr)) {
return FALSE;
}
else {
return TRUE;
}
}
static inline int
is_live_object(rb_objspace_t *objspace, VALUE ptr)
{
switch (BUILTIN_TYPE(ptr)) {
case T_NONE:
case T_ZOMBIE:
return FALSE;
}
if (!is_garbage_object(objspace, ptr)) {
return TRUE;
}
else {
return FALSE;
}
}
static inline int
is_markable_object(rb_objspace_t *objspace, VALUE obj)
{
if (rb_special_const_p(obj)) return FALSE; /* special const is not markable */
check_rvalue_consistency(obj);
return TRUE;
}
int
rb_objspace_markable_object_p(VALUE obj)
{
rb_objspace_t *objspace = &rb_objspace;
return is_markable_object(objspace, obj) && is_live_object(objspace, obj);
}
int
rb_objspace_garbage_object_p(VALUE obj)
{
rb_objspace_t *objspace = &rb_objspace;
return is_garbage_object(objspace, obj);
}
/*
* call-seq:
* ObjectSpace._id2ref(object_id) -> an_object
*
* Converts an object id to a reference to the object. May not be
* called on an object id passed as a parameter to a finalizer.
*
* s = "I am a string" #=> "I am a string"
* r = ObjectSpace._id2ref(s.object_id) #=> "I am a string"
* r == s #=> true
*
*/
static VALUE
id2ref(VALUE objid)
{
#if SIZEOF_LONG == SIZEOF_VOIDP
#define NUM2PTR(x) NUM2ULONG(x)
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
#define NUM2PTR(x) NUM2ULL(x)
#endif
rb_objspace_t *objspace = &rb_objspace;
VALUE ptr;
VALUE orig;
void *p0;
if (FIXNUM_P(objid) || rb_big_size(objid) <= SIZEOF_VOIDP) {
ptr = NUM2PTR(objid);
if (ptr == Qtrue) return Qtrue;
if (ptr == Qfalse) return Qfalse;
if (ptr == Qnil) return Qnil;
if (FIXNUM_P(ptr)) return (VALUE)ptr;
if (FLONUM_P(ptr)) return (VALUE)ptr;
ptr = obj_id_to_ref(objid);
if ((ptr % sizeof(RVALUE)) == (4 << 2)) {
ID symid = ptr / sizeof(RVALUE);
p0 = (void *)ptr;
if (rb_id2str(symid) == 0)
rb_raise(rb_eRangeError, "%p is not symbol id value", p0);
return ID2SYM(symid);
}
}
if (st_lookup(objspace->id_to_obj_tbl, objid, &orig)) {
return orig;
}
if (rb_int_ge(objid, objspace->next_object_id)) {
rb_raise(rb_eRangeError, "%+"PRIsVALUE" is not id value", rb_int2str(objid, 10));
} else {
rb_raise(rb_eRangeError, "%+"PRIsVALUE" is recycled object", rb_int2str(objid, 10));
}
}
static VALUE
os_id2ref(VALUE os, VALUE objid)
{
return id2ref(objid);
}
static VALUE
rb_find_object_id(VALUE obj, VALUE (*get_heap_object_id)(VALUE))
{
if (STATIC_SYM_P(obj)) {
return (SYM2ID(obj) * sizeof(RVALUE) + (4 << 2)) | FIXNUM_FLAG;
}
else if (FLONUM_P(obj)) {
#if SIZEOF_LONG == SIZEOF_VOIDP
return LONG2NUM((SIGNED_VALUE)obj);
#else
return LL2NUM((SIGNED_VALUE)obj);
#endif
}
else if (SPECIAL_CONST_P(obj)) {
return LONG2NUM((SIGNED_VALUE)obj);
}
return get_heap_object_id(obj);
}
static VALUE
cached_object_id(VALUE obj)
{
VALUE id;
rb_objspace_t *objspace = &rb_objspace;
if (st_lookup(objspace->obj_to_id_tbl, (st_data_t)obj, &id)) {
GC_ASSERT(FL_TEST(obj, FL_SEEN_OBJ_ID));
return id;
}
else {
GC_ASSERT(!FL_TEST(obj, FL_SEEN_OBJ_ID));
id = objspace->next_object_id;
objspace->next_object_id = rb_int_plus(id, INT2FIX(OBJ_ID_INCREMENT));
st_insert(objspace->obj_to_id_tbl, (st_data_t)obj, (st_data_t)id);
st_insert(objspace->id_to_obj_tbl, (st_data_t)id, (st_data_t)obj);
FL_SET(obj, FL_SEEN_OBJ_ID);
return id;
}
}
static VALUE
nonspecial_obj_id_(VALUE obj)
{
return nonspecial_obj_id(obj);
}
VALUE
rb_memory_id(VALUE obj)
{
return rb_find_object_id(obj, nonspecial_obj_id_);
}
/*
* Document-method: __id__
* Document-method: object_id
*
* call-seq:
* obj.__id__ -> integer
* obj.object_id -> integer
*
* Returns an integer identifier for +obj+.
*
* The same number will be returned on all calls to +object_id+ for a given
* object, and no two active objects will share an id.
*
* Note: that some objects of builtin classes are reused for optimization.
* This is the case for immediate values and frozen string literals.
*
* BasicObject implements +__id__+, Kernel implements +object_id+.
*
* Immediate values are not passed by reference but are passed by value:
* +nil+, +true+, +false+, Fixnums, Symbols, and some Floats.
*
* Object.new.object_id == Object.new.object_id # => false
* (21 * 2).object_id == (21 * 2).object_id # => true
* "hello".object_id == "hello".object_id # => false
* "hi".freeze.object_id == "hi".freeze.object_id # => true
*/
VALUE
rb_obj_id(VALUE obj)
{
/*
* 32-bit VALUE space
* MSB ------------------------ LSB
* false 00000000000000000000000000000000
* true 00000000000000000000000000000010
* nil 00000000000000000000000000000100
* undef 00000000000000000000000000000110
* symbol ssssssssssssssssssssssss00001110
* object oooooooooooooooooooooooooooooo00 = 0 (mod sizeof(RVALUE))
* fixnum fffffffffffffffffffffffffffffff1
*
* object_id space
* LSB
* false 00000000000000000000000000000000
* true 00000000000000000000000000000010
* nil 00000000000000000000000000000100
* undef 00000000000000000000000000000110
* symbol 000SSSSSSSSSSSSSSSSSSSSSSSSSSS0 S...S % A = 4 (S...S = s...s * A + 4)
* object oooooooooooooooooooooooooooooo0 o...o % A = 0
* fixnum fffffffffffffffffffffffffffffff1 bignum if required
*
* where A = sizeof(RVALUE)/4
*
* sizeof(RVALUE) is
* 20 if 32-bit, double is 4-byte aligned
* 24 if 32-bit, double is 8-byte aligned
* 40 if 64-bit
*/
return rb_find_object_id(obj, cached_object_id);
}
#include "regint.h"
static size_t
obj_memsize_of(VALUE obj, int use_all_types)
{
size_t size = 0;
if (SPECIAL_CONST_P(obj)) {
return 0;
}
if (FL_TEST(obj, FL_EXIVAR)) {
size += rb_generic_ivar_memsize(obj);
}
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
if (!(RBASIC(obj)->flags & ROBJECT_EMBED) &&
ROBJECT(obj)->as.heap.ivptr) {
size += ROBJECT(obj)->as.heap.numiv * sizeof(VALUE);
}
break;
case T_MODULE:
case T_CLASS:
if (RCLASS_M_TBL(obj)) {
size += rb_id_table_memsize(RCLASS_M_TBL(obj));
}
if (RCLASS_EXT(obj)) {
if (RCLASS_IV_TBL(obj)) {
size += st_memsize(RCLASS_IV_TBL(obj));
}
if (RCLASS_IV_INDEX_TBL(obj)) {
size += st_memsize(RCLASS_IV_INDEX_TBL(obj));
}
if (RCLASS(obj)->ptr->iv_tbl) {
size += st_memsize(RCLASS(obj)->ptr->iv_tbl);
}
if (RCLASS(obj)->ptr->const_tbl) {
size += rb_id_table_memsize(RCLASS(obj)->ptr->const_tbl);
}
size += sizeof(rb_classext_t);
}
break;
case T_ICLASS:
if (FL_TEST(obj, RICLASS_IS_ORIGIN)) {
if (RCLASS_M_TBL(obj)) {
size += rb_id_table_memsize(RCLASS_M_TBL(obj));
}
}
break;
case T_STRING:
size += rb_str_memsize(obj);
break;
case T_ARRAY:
size += rb_ary_memsize(obj);
break;
case T_HASH:
if (RHASH_AR_TABLE_P(obj)) {
if (RHASH_AR_TABLE(obj) != NULL) {
size_t rb_hash_ar_table_size();
size += rb_hash_ar_table_size();
}
}
else {
VM_ASSERT(RHASH_ST_TABLE(obj) != NULL);
size += st_memsize(RHASH_ST_TABLE(obj));
}
break;
case T_REGEXP:
if (RREGEXP_PTR(obj)) {
size += onig_memsize(RREGEXP_PTR(obj));
}
break;
case T_DATA:
if (use_all_types) size += rb_objspace_data_type_memsize(obj);
break;
case T_MATCH:
if (RMATCH(obj)->rmatch) {
struct rmatch *rm = RMATCH(obj)->rmatch;
size += onig_region_memsize(&rm->regs);
size += sizeof(struct rmatch_offset) * rm->char_offset_num_allocated;
size += sizeof(struct rmatch);
}
break;
case T_FILE:
if (RFILE(obj)->fptr) {
size += rb_io_memsize(RFILE(obj)->fptr);
}
break;
case T_RATIONAL:
case T_COMPLEX:
break;
case T_IMEMO:
size += imemo_memsize(obj);
break;
case T_FLOAT:
case T_SYMBOL:
break;
case T_BIGNUM:
if (!(RBASIC(obj)->flags & BIGNUM_EMBED_FLAG) && BIGNUM_DIGITS(obj)) {
size += BIGNUM_LEN(obj) * sizeof(BDIGIT);
}
break;
case T_NODE:
UNEXPECTED_NODE(obj_memsize_of);
break;
case T_STRUCT:
if ((RBASIC(obj)->flags & RSTRUCT_EMBED_LEN_MASK) == 0 &&
RSTRUCT(obj)->as.heap.ptr) {
size += sizeof(VALUE) * RSTRUCT_LEN(obj);
}
break;
case T_ZOMBIE:
case T_MOVED:
break;
default:
rb_bug("objspace/memsize_of(): unknown data type 0x%x(%p)",
BUILTIN_TYPE(obj), (void*)obj);
}
return size + sizeof(RVALUE);
}
size_t
rb_obj_memsize_of(VALUE obj)
{
return obj_memsize_of(obj, TRUE);
}
static int
set_zero(st_data_t key, st_data_t val, st_data_t arg)
{
VALUE k = (VALUE)key;
VALUE hash = (VALUE)arg;
rb_hash_aset(hash, k, INT2FIX(0));
return ST_CONTINUE;
}
static VALUE
type_sym(size_t type)
{
switch (type) {
#define COUNT_TYPE(t) case (t): return ID2SYM(rb_intern(#t)); break;
COUNT_TYPE(T_NONE);
COUNT_TYPE(T_OBJECT);
COUNT_TYPE(T_CLASS);
COUNT_TYPE(T_MODULE);
COUNT_TYPE(T_FLOAT);
COUNT_TYPE(T_STRING);
COUNT_TYPE(T_REGEXP);
COUNT_TYPE(T_ARRAY);
COUNT_TYPE(T_HASH);
COUNT_TYPE(T_STRUCT);
COUNT_TYPE(T_BIGNUM);
COUNT_TYPE(T_FILE);
COUNT_TYPE(T_DATA);
COUNT_TYPE(T_MATCH);
COUNT_TYPE(T_COMPLEX);
COUNT_TYPE(T_RATIONAL);
COUNT_TYPE(T_NIL);
COUNT_TYPE(T_TRUE);
COUNT_TYPE(T_FALSE);
COUNT_TYPE(T_SYMBOL);
COUNT_TYPE(T_FIXNUM);
COUNT_TYPE(T_IMEMO);
COUNT_TYPE(T_UNDEF);
COUNT_TYPE(T_NODE);
COUNT_TYPE(T_ICLASS);
COUNT_TYPE(T_ZOMBIE);
COUNT_TYPE(T_MOVED);
#undef COUNT_TYPE
default: return INT2NUM(type); break;
}
}
/*
* call-seq:
* ObjectSpace.count_objects([result_hash]) -> hash
*
* Counts all objects grouped by type.
*
* It returns a hash, such as:
* {
* :TOTAL=>10000,
* :FREE=>3011,
* :T_OBJECT=>6,
* :T_CLASS=>404,
* # ...
* }
*
* The contents of the returned hash are implementation specific.
* It may be changed in future.
*
* The keys starting with +:T_+ means live objects.
* For example, +:T_ARRAY+ is the number of arrays.
* +:FREE+ means object slots which is not used now.
* +:TOTAL+ means sum of above.
*
* If the optional argument +result_hash+ is given,
* it is overwritten and returned. This is intended to avoid probe effect.
*
* h = {}
* ObjectSpace.count_objects(h)
* puts h
* # => { :TOTAL=>10000, :T_CLASS=>158280, :T_MODULE=>20672, :T_STRING=>527249 }
*
* This method is only expected to work on C Ruby.
*
*/
static VALUE
count_objects(int argc, VALUE *argv, VALUE os)
{
rb_objspace_t *objspace = &rb_objspace;
size_t counts[T_MASK+1];
size_t freed = 0;
size_t total = 0;
size_t i;
VALUE hash = Qnil;
if (rb_check_arity(argc, 0, 1) == 1) {
hash = argv[0];
if (!RB_TYPE_P(hash, T_HASH))
rb_raise(rb_eTypeError, "non-hash given");
}
for (i = 0; i <= T_MASK; i++) {
counts[i] = 0;
}
for (i = 0; i < heap_allocated_pages; i++) {
struct heap_page *page = heap_pages_sorted[i];
RVALUE *p, *pend;
p = page->start; pend = p + page->total_slots;
for (;p < pend; p++) {
void *poisoned = asan_poisoned_object_p((VALUE)p);
asan_unpoison_object((VALUE)p, false);
if (p->as.basic.flags) {
counts[BUILTIN_TYPE(p)]++;
}
else {
freed++;
}
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE((VALUE)p) == T_NONE);
asan_poison_object((VALUE)p);
}
}
total += page->total_slots;
}
if (hash == Qnil) {
hash = rb_hash_new();
}
else if (!RHASH_EMPTY_P(hash)) {
rb_hash_stlike_foreach(hash, set_zero, hash);
}
rb_hash_aset(hash, ID2SYM(rb_intern("TOTAL")), SIZET2NUM(total));
rb_hash_aset(hash, ID2SYM(rb_intern("FREE")), SIZET2NUM(freed));
for (i = 0; i <= T_MASK; i++) {
VALUE type = type_sym(i);
if (counts[i])
rb_hash_aset(hash, type, SIZET2NUM(counts[i]));
}
return hash;
}
/*
------------------------ Garbage Collection ------------------------
*/
/* Sweeping */
static size_t
objspace_available_slots(rb_objspace_t *objspace)
{
return heap_eden->total_slots + heap_tomb->total_slots;
}
static size_t
objspace_live_slots(rb_objspace_t *objspace)
{
return (objspace->total_allocated_objects - objspace->profile.total_freed_objects) - heap_pages_final_slots;
}
static size_t
objspace_free_slots(rb_objspace_t *objspace)
{
return objspace_available_slots(objspace) - objspace_live_slots(objspace) - heap_pages_final_slots;
}
static void
gc_setup_mark_bits(struct heap_page *page)
{
#if USE_RGENGC
/* copy oldgen bitmap to mark bitmap */
memcpy(&page->mark_bits[0], &page->uncollectible_bits[0], HEAP_PAGE_BITMAP_SIZE);
#else
/* clear mark bitmap */
memset(&page->mark_bits[0], 0, HEAP_PAGE_BITMAP_SIZE);
#endif
}
static inline int
gc_page_sweep(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *sweep_page)
{
int i;
int empty_slots = 0, freed_slots = 0, final_slots = 0;
RVALUE *p, *pend,*offset;
bits_t *bits, bitset;
gc_report(2, objspace, "page_sweep: start.\n");
sweep_page->flags.before_sweep = FALSE;
p = sweep_page->start; pend = p + sweep_page->total_slots;
offset = p - NUM_IN_PAGE(p);
bits = sweep_page->mark_bits;
/* create guard : fill 1 out-of-range */
bits[BITMAP_INDEX(p)] |= BITMAP_BIT(p)-1;
bits[BITMAP_INDEX(pend)] |= ~(BITMAP_BIT(pend) - 1);
for (i=0; i < HEAP_PAGE_BITMAP_LIMIT; i++) {
bitset = ~bits[i];
if (bitset) {
p = offset + i * BITS_BITLENGTH;
do {
asan_unpoison_object((VALUE)p, false);
if (bitset & 1) {
switch (BUILTIN_TYPE(p)) {
default: { /* majority case */
gc_report(2, objspace, "page_sweep: free %p\n", (void *)p);
#if USE_RGENGC && RGENGC_CHECK_MODE
if (!is_full_marking(objspace)) {
if (RVALUE_OLD_P((VALUE)p)) rb_bug("page_sweep: %p - old while minor GC.", (void *)p);
if (rgengc_remembered_sweep(objspace, (VALUE)p)) rb_bug("page_sweep: %p - remembered.", (void *)p);
}
#endif
if (obj_free(objspace, (VALUE)p)) {
final_slots++;
}
else {
(void)VALGRIND_MAKE_MEM_UNDEFINED((void*)p, sizeof(RVALUE));
heap_page_add_freeobj(objspace, sweep_page, (VALUE)p);
gc_report(3, objspace, "page_sweep: %s is added to freelist\n", obj_info((VALUE)p));
freed_slots++;
asan_poison_object((VALUE)p);
}
break;
}
/* minor cases */
case T_ZOMBIE:
/* already counted */
break;
case T_NONE:
empty_slots++; /* already freed */
break;
}
}
p++;
bitset >>= 1;
} while (bitset);
}
}
gc_setup_mark_bits(sweep_page);
#if GC_PROFILE_MORE_DETAIL
if (gc_prof_enabled(objspace)) {
gc_profile_record *record = gc_prof_record(objspace);
record->removing_objects += final_slots + freed_slots;
record->empty_objects += empty_slots;
}
#endif
if (0) fprintf(stderr, "gc_page_sweep(%d): total_slots: %d, freed_slots: %d, empty_slots: %d, final_slots: %d\n",
(int)rb_gc_count(),
(int)sweep_page->total_slots,
freed_slots, empty_slots, final_slots);
sweep_page->free_slots = freed_slots + empty_slots;
objspace->profile.total_freed_objects += freed_slots;
heap_pages_final_slots += final_slots;
sweep_page->final_slots += final_slots;
if (heap_pages_deferred_final && !finalizing) {
rb_thread_t *th = GET_THREAD();
if (th) {
gc_finalize_deferred_register(objspace);
}
}
gc_report(2, objspace, "page_sweep: end.\n");
return freed_slots + empty_slots;
}
/* allocate additional minimum page to work */
static void
gc_heap_prepare_minimum_pages(rb_objspace_t *objspace, rb_heap_t *heap)
{
if (!heap->free_pages && heap_increment(objspace, heap) == FALSE) {
/* there is no free after page_sweep() */
heap_set_increment(objspace, 1);
if (!heap_increment(objspace, heap)) { /* can't allocate additional free objects */
rb_memerror();
}
}
}
static const char *
gc_mode_name(enum gc_mode mode)
{
switch (mode) {
case gc_mode_none: return "none";
case gc_mode_marking: return "marking";
case gc_mode_sweeping: return "sweeping";
default: rb_bug("gc_mode_name: unknown mode: %d", (int)mode);
}
}
static void
gc_mode_transition(rb_objspace_t *objspace, enum gc_mode mode)
{
#if RGENGC_CHECK_MODE
enum gc_mode prev_mode = gc_mode(objspace);
switch (prev_mode) {
case gc_mode_none: GC_ASSERT(mode == gc_mode_marking); break;
case gc_mode_marking: GC_ASSERT(mode == gc_mode_sweeping); break;
case gc_mode_sweeping: GC_ASSERT(mode == gc_mode_none); break;
}
#endif
if (0) fprintf(stderr, "gc_mode_transition: %s->%s\n", gc_mode_name(gc_mode(objspace)), gc_mode_name(mode));
gc_mode_set(objspace, mode);
}
static void
gc_sweep_start_heap(rb_objspace_t *objspace, rb_heap_t *heap)
{
heap->sweeping_page = list_top(&heap->pages, struct heap_page, page_node);
heap->free_pages = NULL;
#if GC_ENABLE_INCREMENTAL_MARK
heap->pooled_pages = NULL;
objspace->rincgc.pooled_slots = 0;
#endif
if (heap->using_page) {
struct heap_page *page = heap->using_page;
asan_unpoison_memory_region(&page->freelist, sizeof(RVALUE*), false);
RVALUE **p = &page->freelist;
while (*p) {
p = &(*p)->as.free.next;
}
*p = heap->freelist;
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
heap->using_page = NULL;
}
heap->freelist = NULL;
}
#if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 4
__attribute__((noinline))
#endif
static void
gc_sweep_start(rb_objspace_t *objspace)
{
gc_mode_transition(objspace, gc_mode_sweeping);
gc_sweep_start_heap(objspace, heap_eden);
}
static void
gc_sweep_finish(rb_objspace_t *objspace)
{
gc_report(1, objspace, "gc_sweep_finish\n");
gc_prof_set_heap_info(objspace);
heap_pages_free_unused_pages(objspace);
/* if heap_pages has unused pages, then assign them to increment */
if (heap_allocatable_pages < heap_tomb->total_pages) {
heap_allocatable_pages_set(objspace, heap_tomb->total_pages);
}
gc_event_hook(objspace, RUBY_INTERNAL_EVENT_GC_END_SWEEP, 0);
gc_mode_transition(objspace, gc_mode_none);
#if RGENGC_CHECK_MODE >= 2
gc_verify_internal_consistency(objspace);
#endif
}
static int
gc_sweep_step(rb_objspace_t *objspace, rb_heap_t *heap)
{
struct heap_page *sweep_page = heap->sweeping_page;
int unlink_limit = 3;
#if GC_ENABLE_INCREMENTAL_MARK
int need_pool = will_be_incremental_marking(objspace) ? TRUE : FALSE;
gc_report(2, objspace, "gc_sweep_step (need_pool: %d)\n", need_pool);
#else
gc_report(2, objspace, "gc_sweep_step\n");
#endif
if (sweep_page == NULL) return FALSE;
#if GC_ENABLE_LAZY_SWEEP
gc_prof_sweep_timer_start(objspace);
#endif
do {
int free_slots = gc_page_sweep(objspace, heap, sweep_page);
heap->sweeping_page = list_next(&heap->pages, sweep_page, page_node);
if (sweep_page->final_slots + free_slots == sweep_page->total_slots &&
heap_pages_freeable_pages > 0 &&
unlink_limit > 0) {
heap_pages_freeable_pages--;
unlink_limit--;
/* there are no living objects -> move this page to tomb heap */
heap_unlink_page(objspace, heap, sweep_page);
heap_add_page(objspace, heap_tomb, sweep_page);
}
else if (free_slots > 0) {
#if GC_ENABLE_INCREMENTAL_MARK
if (need_pool) {
if (heap_add_poolpage(objspace, heap, sweep_page)) {
need_pool = FALSE;
}
}
else {
heap_add_freepage(objspace, heap, sweep_page);
break;
}
#else
heap_add_freepage(objspace, heap, sweep_page);
break;
#endif
}
else {
sweep_page->free_next = NULL;
}
} while ((sweep_page = heap->sweeping_page));
if (!heap->sweeping_page) {
gc_sweep_finish(objspace);
}
#if GC_ENABLE_LAZY_SWEEP
gc_prof_sweep_timer_stop(objspace);
#endif
return heap->free_pages != NULL;
}
static void
gc_sweep_rest(rb_objspace_t *objspace)
{
rb_heap_t *heap = heap_eden; /* lazy sweep only for eden */
while (has_sweeping_pages(heap)) {
gc_sweep_step(objspace, heap);
}
}
static void
gc_sweep_continue(rb_objspace_t *objspace, rb_heap_t *heap)
{
GC_ASSERT(dont_gc == FALSE);
if (!GC_ENABLE_LAZY_SWEEP) return;
gc_enter(objspace, "sweep_continue");
#if USE_RGENGC
if (objspace->rgengc.need_major_gc == GPR_FLAG_NONE && heap_increment(objspace, heap)) {
gc_report(3, objspace, "gc_sweep_continue: success heap_increment().\n");
}
#endif
gc_sweep_step(objspace, heap);
gc_exit(objspace, "sweep_continue");
}
static void
gc_sweep(rb_objspace_t *objspace)
{
const unsigned int immediate_sweep = objspace->flags.immediate_sweep;
gc_report(1, objspace, "gc_sweep: immediate: %d\n", immediate_sweep);
if (immediate_sweep) {
#if !GC_ENABLE_LAZY_SWEEP
gc_prof_sweep_timer_start(objspace);
#endif
gc_sweep_start(objspace);
gc_sweep_rest(objspace);
#if !GC_ENABLE_LAZY_SWEEP
gc_prof_sweep_timer_stop(objspace);
#endif
}
else {
struct heap_page *page = NULL;
gc_sweep_start(objspace);
list_for_each(&heap_eden->pages, page, page_node) {
page->flags.before_sweep = TRUE;
}
gc_sweep_step(objspace, heap_eden);
}
gc_heap_prepare_minimum_pages(objspace, heap_eden);
}
/* Marking - Marking stack */
static stack_chunk_t *
stack_chunk_alloc(void)
{
stack_chunk_t *res;
res = malloc(sizeof(stack_chunk_t));
if (!res)
rb_memerror();
return res;
}
static inline int
is_mark_stack_empty(mark_stack_t *stack)
{
return stack->chunk == NULL;
}
static size_t
mark_stack_size(mark_stack_t *stack)
{
size_t size = stack->index;
stack_chunk_t *chunk = stack->chunk ? stack->chunk->next : NULL;
while (chunk) {
size += stack->limit;
chunk = chunk->next;
}
return size;
}
static void
add_stack_chunk_cache(mark_stack_t *stack, stack_chunk_t *chunk)
{
chunk->next = stack->cache;
stack->cache = chunk;
stack->cache_size++;
}
static void
shrink_stack_chunk_cache(mark_stack_t *stack)
{
stack_chunk_t *chunk;
if (stack->unused_cache_size > (stack->cache_size/2)) {
chunk = stack->cache;
stack->cache = stack->cache->next;
stack->cache_size--;
free(chunk);
}
stack->unused_cache_size = stack->cache_size;
}
static void
push_mark_stack_chunk(mark_stack_t *stack)
{
stack_chunk_t *next;
GC_ASSERT(stack->index == stack->limit);
if (stack->cache_size > 0) {
next = stack->cache;
stack->cache = stack->cache->next;
stack->cache_size--;
if (stack->unused_cache_size > stack->cache_size)
stack->unused_cache_size = stack->cache_size;
}
else {
next = stack_chunk_alloc();
}
next->next = stack->chunk;
stack->chunk = next;
stack->index = 0;
}
static void
pop_mark_stack_chunk(mark_stack_t *stack)
{
stack_chunk_t *prev;
prev = stack->chunk->next;
GC_ASSERT(stack->index == 0);
add_stack_chunk_cache(stack, stack->chunk);
stack->chunk = prev;
stack->index = stack->limit;
}
static void
free_stack_chunks(mark_stack_t *stack)
{
stack_chunk_t *chunk = stack->chunk;
stack_chunk_t *next = NULL;
while (chunk != NULL) {
next = chunk->next;
free(chunk);
chunk = next;
}
}
static void
push_mark_stack(mark_stack_t *stack, VALUE data)
{
if (stack->index == stack->limit) {
push_mark_stack_chunk(stack);
}
stack->chunk->data[stack->index++] = data;
}
static int
pop_mark_stack(mark_stack_t *stack, VALUE *data)
{
if (is_mark_stack_empty(stack)) {
return FALSE;
}
if (stack->index == 1) {
*data = stack->chunk->data[--stack->index];
pop_mark_stack_chunk(stack);
}
else {
*data = stack->chunk->data[--stack->index];
}
return TRUE;
}
#if GC_ENABLE_INCREMENTAL_MARK
static int
invalidate_mark_stack_chunk(stack_chunk_t *chunk, int limit, VALUE obj)
{
int i;
for (i=0; i<limit; i++) {
if (chunk->data[i] == obj) {
chunk->data[i] = Qundef;
return TRUE;
}
}
return FALSE;
}
static void
invalidate_mark_stack(mark_stack_t *stack, VALUE obj)
{
stack_chunk_t *chunk = stack->chunk;
int limit = stack->index;
while (chunk) {
if (invalidate_mark_stack_chunk(chunk, limit, obj)) return;
chunk = chunk->next;
limit = stack->limit;
}
rb_bug("invalid_mark_stack: unreachable");
}
#endif
static void
init_mark_stack(mark_stack_t *stack)
{
int i;
MEMZERO(stack, mark_stack_t, 1);
stack->index = stack->limit = STACK_CHUNK_SIZE;
stack->cache_size = 0;
for (i=0; i < 4; i++) {
add_stack_chunk_cache(stack, stack_chunk_alloc());
}
stack->unused_cache_size = stack->cache_size;
}
/* Marking */
#define SET_STACK_END SET_MACHINE_STACK_END(&ec->machine.stack_end)
#define STACK_START (ec->machine.stack_start)
#define STACK_END (ec->machine.stack_end)
#define STACK_LEVEL_MAX (ec->machine.stack_maxsize/sizeof(VALUE))
#ifdef __EMSCRIPTEN__
#undef STACK_GROW_DIRECTION
#define STACK_GROW_DIRECTION 1
#endif
#if STACK_GROW_DIRECTION < 0
# define STACK_LENGTH (size_t)(STACK_START - STACK_END)
#elif STACK_GROW_DIRECTION > 0
# define STACK_LENGTH (size_t)(STACK_END - STACK_START + 1)
#else
# define STACK_LENGTH ((STACK_END < STACK_START) ? (size_t)(STACK_START - STACK_END) \
: (size_t)(STACK_END - STACK_START + 1))
#endif
#if !STACK_GROW_DIRECTION
int ruby_stack_grow_direction;
int
ruby_get_stack_grow_direction(volatile VALUE *addr)
{
VALUE *end;
SET_MACHINE_STACK_END(&end);
if (end > addr) return ruby_stack_grow_direction = 1;
return ruby_stack_grow_direction = -1;
}
#endif
size_t
ruby_stack_length(VALUE **p)
{
rb_execution_context_t *ec = GET_EC();
SET_STACK_END;
if (p) *p = STACK_UPPER(STACK_END, STACK_START, STACK_END);
return STACK_LENGTH;
}
#define PREVENT_STACK_OVERFLOW 1
#ifndef PREVENT_STACK_OVERFLOW
#if !(defined(POSIX_SIGNAL) && defined(SIGSEGV) && defined(HAVE_SIGALTSTACK))
# define PREVENT_STACK_OVERFLOW 1
#else
# define PREVENT_STACK_OVERFLOW 0
#endif
#endif
#if PREVENT_STACK_OVERFLOW
static int
stack_check(rb_execution_context_t *ec, int water_mark)
{
SET_STACK_END;
size_t length = STACK_LENGTH;
size_t maximum_length = STACK_LEVEL_MAX - water_mark;
return length > maximum_length;
}
#else
#define stack_check(ec, water_mark) FALSE
#endif
#define STACKFRAME_FOR_CALL_CFUNC 2048
MJIT_FUNC_EXPORTED int
rb_ec_stack_check(rb_execution_context_t *ec)
{
return stack_check(ec, STACKFRAME_FOR_CALL_CFUNC);
}
int
ruby_stack_check(void)
{
return stack_check(GET_EC(), STACKFRAME_FOR_CALL_CFUNC);
}
ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(static void mark_locations_array(rb_objspace_t *objspace, register const VALUE *x, register long n));
static void
mark_locations_array(rb_objspace_t *objspace, register const VALUE *x, register long n)
{
VALUE v;
while (n--) {
v = *x;
gc_mark_maybe(objspace, v);
x++;
}
}
static void
gc_mark_locations(rb_objspace_t *objspace, const VALUE *start, const VALUE *end)
{
long n;
if (end <= start) return;
n = end - start;
mark_locations_array(objspace, start, n);
}
void
rb_gc_mark_locations(const VALUE *start, const VALUE *end)
{
gc_mark_locations(&rb_objspace, start, end);
}
static void
gc_mark_values(rb_objspace_t *objspace, long n, const VALUE *values)
{
long i;
for (i=0; i<n; i++) {
gc_mark(objspace, values[i]);
}
}
void
rb_gc_mark_values(long n, const VALUE *values)
{
long i;
rb_objspace_t *objspace = &rb_objspace;
for (i=0; i<n; i++) {
gc_mark_and_pin(objspace, values[i]);
}
}
static void
gc_mark_and_pin_stack_values(rb_objspace_t *objspace, long n, const VALUE *values)
{
long i;
for (i=0; i<n; i++) {
/* skip MOVED objects that are on the stack */
if (is_markable_object(objspace, values[i]) && T_MOVED != BUILTIN_TYPE(values[i])) {
gc_mark_and_pin(objspace, values[i]);
}
}
}
void
rb_gc_mark_vm_stack_values(long n, const VALUE *values)
{
rb_objspace_t *objspace = &rb_objspace;
gc_mark_and_pin_stack_values(objspace, n, values);
}
static int
mark_value(st_data_t key, st_data_t value, st_data_t data)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
gc_mark(objspace, (VALUE)value);
return ST_CONTINUE;
}
static int
mark_value_pin(st_data_t key, st_data_t value, st_data_t data)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
gc_mark_and_pin(objspace, (VALUE)value);
return ST_CONTINUE;
}
static void
mark_tbl_no_pin(rb_objspace_t *objspace, st_table *tbl)
{
if (!tbl || tbl->num_entries == 0) return;
st_foreach(tbl, mark_value, (st_data_t)objspace);
}
static void
mark_tbl(rb_objspace_t *objspace, st_table *tbl)
{
if (!tbl || tbl->num_entries == 0) return;
st_foreach(tbl, mark_value_pin, (st_data_t)objspace);
}
static int
mark_key(st_data_t key, st_data_t value, st_data_t data)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
gc_mark_and_pin(objspace, (VALUE)key);
return ST_CONTINUE;
}
static void
mark_set(rb_objspace_t *objspace, st_table *tbl)
{
if (!tbl) return;
st_foreach(tbl, mark_key, (st_data_t)objspace);
}
static void
mark_finalizer_tbl(rb_objspace_t *objspace, st_table *tbl)
{
if (!tbl) return;
st_foreach(tbl, mark_value, (st_data_t)objspace);
}
void
rb_mark_set(st_table *tbl)
{
mark_set(&rb_objspace, tbl);
}
static int
mark_keyvalue(st_data_t key, st_data_t value, st_data_t data)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
gc_mark(objspace, (VALUE)key);
gc_mark(objspace, (VALUE)value);
return ST_CONTINUE;
}
static int
pin_key_pin_value(st_data_t key, st_data_t value, st_data_t data)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
gc_mark_and_pin(objspace, (VALUE)key);
gc_mark_and_pin(objspace, (VALUE)value);
return ST_CONTINUE;
}
static int
pin_key_mark_value(st_data_t key, st_data_t value, st_data_t data)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
gc_mark_and_pin(objspace, (VALUE)key);
gc_mark(objspace, (VALUE)value);
return ST_CONTINUE;
}
static void
mark_hash(rb_objspace_t *objspace, VALUE hash)
{
if (rb_hash_compare_by_id_p(hash)) {
rb_hash_stlike_foreach(hash, pin_key_mark_value, (st_data_t)objspace);
}
else {
rb_hash_stlike_foreach(hash, mark_keyvalue, (st_data_t)objspace);
}
if (RHASH_AR_TABLE_P(hash)) {
if (objspace->mark_func_data == NULL && RHASH_TRANSIENT_P(hash)) {
rb_transient_heap_mark(hash, RHASH_AR_TABLE(hash));
}
}
else {
VM_ASSERT(!RHASH_TRANSIENT_P(hash));
}
gc_mark(objspace, RHASH(hash)->ifnone);
}
static void
mark_st(rb_objspace_t *objspace, st_table *tbl)
{
if (!tbl) return;
st_foreach(tbl, pin_key_pin_value, (st_data_t)objspace);
}
void
rb_mark_hash(st_table *tbl)
{
mark_st(&rb_objspace, tbl);
}
static void
mark_method_entry(rb_objspace_t *objspace, const rb_method_entry_t *me)
{
const rb_method_definition_t *def = me->def;
gc_mark(objspace, me->owner);
gc_mark(objspace, me->defined_class);
if (def) {
switch (def->type) {
case VM_METHOD_TYPE_ISEQ:
if (def->body.iseq.iseqptr) gc_mark(objspace, (VALUE)def->body.iseq.iseqptr);
gc_mark(objspace, (VALUE)def->body.iseq.cref);
break;
case VM_METHOD_TYPE_ATTRSET:
case VM_METHOD_TYPE_IVAR:
gc_mark(objspace, def->body.attr.location);
break;
case VM_METHOD_TYPE_BMETHOD:
gc_mark(objspace, def->body.bmethod.proc);
if (def->body.bmethod.hooks) rb_hook_list_mark(def->body.bmethod.hooks);
break;
case VM_METHOD_TYPE_ALIAS:
gc_mark(objspace, (VALUE)def->body.alias.original_me);
return;
case VM_METHOD_TYPE_REFINED:
gc_mark(objspace, (VALUE)def->body.refined.orig_me);
gc_mark(objspace, (VALUE)def->body.refined.owner);
break;
case VM_METHOD_TYPE_CFUNC:
case VM_METHOD_TYPE_ZSUPER:
case VM_METHOD_TYPE_MISSING:
case VM_METHOD_TYPE_OPTIMIZED:
case VM_METHOD_TYPE_UNDEF:
case VM_METHOD_TYPE_NOTIMPLEMENTED:
break;
}
}
}
static enum rb_id_table_iterator_result
mark_method_entry_i(VALUE me, void *data)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
gc_mark(objspace, me);
return ID_TABLE_CONTINUE;
}
static void
mark_m_tbl(rb_objspace_t *objspace, struct rb_id_table *tbl)
{
if (tbl) {
rb_id_table_foreach_values(tbl, mark_method_entry_i, objspace);
}
}
static enum rb_id_table_iterator_result
mark_const_entry_i(VALUE value, void *data)
{
const rb_const_entry_t *ce = (const rb_const_entry_t *)value;
rb_objspace_t *objspace = data;
gc_mark(objspace, ce->value);
gc_mark(objspace, ce->file);
return ID_TABLE_CONTINUE;
}
static void
mark_const_tbl(rb_objspace_t *objspace, struct rb_id_table *tbl)
{
if (!tbl) return;
rb_id_table_foreach_values(tbl, mark_const_entry_i, objspace);
}
#if STACK_GROW_DIRECTION < 0
#define GET_STACK_BOUNDS(start, end, appendix) ((start) = STACK_END, (end) = STACK_START)
#elif STACK_GROW_DIRECTION > 0
#define GET_STACK_BOUNDS(start, end, appendix) ((start) = STACK_START, (end) = STACK_END+(appendix))
#else
#define GET_STACK_BOUNDS(start, end, appendix) \
((STACK_END < STACK_START) ? \
((start) = STACK_END, (end) = STACK_START) : ((start) = STACK_START, (end) = STACK_END+(appendix)))
#endif
static void mark_stack_locations(rb_objspace_t *objspace, const rb_execution_context_t *ec,
const VALUE *stack_start, const VALUE *stack_end);
static void
mark_current_machine_context(rb_objspace_t *objspace, rb_execution_context_t *ec)
{
union {
rb_jmp_buf j;
VALUE v[sizeof(rb_jmp_buf) / sizeof(VALUE)];
} save_regs_gc_mark;
VALUE *stack_start, *stack_end;
FLUSH_REGISTER_WINDOWS;
memset(&save_regs_gc_mark, 0, sizeof(save_regs_gc_mark));
/* This assumes that all registers are saved into the jmp_buf (and stack) */
rb_setjmp(save_regs_gc_mark.j);
/* SET_STACK_END must be called in this function because
* the stack frame of this function may contain
* callee save registers and they should be marked. */
SET_STACK_END;
GET_STACK_BOUNDS(stack_start, stack_end, 1);
mark_locations_array(objspace, save_regs_gc_mark.v, numberof(save_regs_gc_mark.v));
mark_stack_locations(objspace, ec, stack_start, stack_end);
}
void
rb_gc_mark_machine_stack(const rb_execution_context_t *ec)
{
rb_objspace_t *objspace = &rb_objspace;
VALUE *stack_start, *stack_end;
GET_STACK_BOUNDS(stack_start, stack_end, 0);
mark_stack_locations(objspace, ec, stack_start, stack_end);
}
static void
mark_stack_locations(rb_objspace_t *objspace, const rb_execution_context_t *ec,
const VALUE *stack_start, const VALUE *stack_end)
{
gc_mark_locations(objspace, stack_start, stack_end);
#if defined(__mc68000__)
gc_mark_locations(objspace,
(VALUE*)((char*)stack_start + 2),
(VALUE*)((char*)stack_end - 2));
#endif
}
void
rb_mark_tbl(st_table *tbl)
{
mark_tbl(&rb_objspace, tbl);
}
void
rb_mark_tbl_no_pin(st_table *tbl)
{
mark_tbl_no_pin(&rb_objspace, tbl);
}
static void
gc_mark_maybe(rb_objspace_t *objspace, VALUE obj)
{
(void)VALGRIND_MAKE_MEM_DEFINED(&obj, sizeof(obj));
if (is_pointer_to_heap(objspace, (void *)obj)) {
void *ptr = __asan_region_is_poisoned((void *)obj, SIZEOF_VALUE);
asan_unpoison_object(obj, false);
/* Garbage can live on the stack, so do not mark or pin */
switch (BUILTIN_TYPE(obj)) {
case T_MOVED:
case T_ZOMBIE:
case T_NONE:
break;
default:
gc_mark_and_pin(objspace, obj);
break;
}
if (ptr) {
GC_ASSERT(BUILTIN_TYPE(obj) == T_NONE);
asan_poison_object(obj);
}
}
}
void
rb_gc_mark_maybe(VALUE obj)
{
gc_mark_maybe(&rb_objspace, obj);
}
static inline int
gc_mark_set(rb_objspace_t *objspace, VALUE obj)
{
if (RVALUE_MARKED(obj)) return 0;
MARK_IN_BITMAP(GET_HEAP_MARK_BITS(obj), obj);
return 1;
}
#if USE_RGENGC
static int
gc_remember_unprotected(rb_objspace_t *objspace, VALUE obj)
{
struct heap_page *page = GET_HEAP_PAGE(obj);
bits_t *uncollectible_bits = &page->uncollectible_bits[0];
if (!MARKED_IN_BITMAP(uncollectible_bits, obj)) {
page->flags.has_uncollectible_shady_objects = TRUE;
MARK_IN_BITMAP(uncollectible_bits, obj);
objspace->rgengc.uncollectible_wb_unprotected_objects++;
#if RGENGC_PROFILE > 0
objspace->profile.total_remembered_shady_object_count++;
#if RGENGC_PROFILE >= 2
objspace->profile.remembered_shady_object_count_types[BUILTIN_TYPE(obj)]++;
#endif
#endif
return TRUE;
}
else {
return FALSE;
}
}
#endif
static void
rgengc_check_relation(rb_objspace_t *objspace, VALUE obj)
{
#if USE_RGENGC
const VALUE old_parent = objspace->rgengc.parent_object;
if (old_parent) { /* parent object is old */
if (RVALUE_WB_UNPROTECTED(obj)) {
if (gc_remember_unprotected(objspace, obj)) {
gc_report(2, objspace, "relation: (O->S) %s -> %s\n", obj_info(old_parent), obj_info(obj));
}
}
else {
if (!RVALUE_OLD_P(obj)) {
if (RVALUE_MARKED(obj)) {
/* An object pointed from an OLD object should be OLD. */
gc_report(2, objspace, "relation: (O->unmarked Y) %s -> %s\n", obj_info(old_parent), obj_info(obj));
RVALUE_AGE_SET_OLD(objspace, obj);
if (is_incremental_marking(objspace)) {
if (!RVALUE_MARKING(obj)) {
gc_grey(objspace, obj);
}
}
else {
rgengc_remember(objspace, obj);
}
}
else {
gc_report(2, objspace, "relation: (O->Y) %s -> %s\n", obj_info(old_parent), obj_info(obj));
RVALUE_AGE_SET_CANDIDATE(objspace, obj);
}
}
}
}
GC_ASSERT(old_parent == objspace->rgengc.parent_object);
#endif
}
static void
gc_grey(rb_objspace_t *objspace, VALUE obj)
{
#if RGENGC_CHECK_MODE
if (RVALUE_MARKED(obj) == FALSE) rb_bug("gc_grey: %s is not marked.", obj_info(obj));
if (RVALUE_MARKING(obj) == TRUE) rb_bug("gc_grey: %s is marking/remembered.", obj_info(obj));
#endif
#if GC_ENABLE_INCREMENTAL_MARK
if (is_incremental_marking(objspace)) {
MARK_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), obj);
}
#endif
push_mark_stack(&objspace->mark_stack, obj);
}
static void
gc_aging(rb_objspace_t *objspace, VALUE obj)
{
#if USE_RGENGC
struct heap_page *page = GET_HEAP_PAGE(obj);
GC_ASSERT(RVALUE_MARKING(obj) == FALSE);
check_rvalue_consistency(obj);
if (!RVALUE_PAGE_WB_UNPROTECTED(page, obj)) {
if (!RVALUE_OLD_P(obj)) {
gc_report(3, objspace, "gc_aging: YOUNG: %s\n", obj_info(obj));
RVALUE_AGE_INC(objspace, obj);
}
else if (is_full_marking(objspace)) {
GC_ASSERT(RVALUE_PAGE_UNCOLLECTIBLE(page, obj) == FALSE);
RVALUE_PAGE_OLD_UNCOLLECTIBLE_SET(objspace, page, obj);
}
}
check_rvalue_consistency(obj);
#endif /* USE_RGENGC */
objspace->marked_slots++;
}
NOINLINE(static void gc_mark_ptr(rb_objspace_t *objspace, VALUE obj));
static void
gc_mark_ptr(rb_objspace_t *objspace, VALUE obj)
{
if (LIKELY(objspace->mark_func_data == NULL)) {
rgengc_check_relation(objspace, obj);
if (!gc_mark_set(objspace, obj)) return; /* already marked */
if (RB_TYPE_P(obj, T_NONE)) rb_bug("try to mark T_NONE object"); /* check here will help debugging */
gc_aging(objspace, obj);
gc_grey(objspace, obj);
}
else {
objspace->mark_func_data->mark_func(obj, objspace->mark_func_data->data);
}
}
static inline void
gc_pin(rb_objspace_t *objspace, VALUE obj)
{
GC_ASSERT(is_markable_object(objspace, obj));
if (UNLIKELY(objspace->flags.during_compacting)) {
MARK_IN_BITMAP(GET_HEAP_PINNED_BITS(obj), obj);
}
}
static inline void
gc_mark_and_pin(rb_objspace_t *objspace, VALUE obj)
{
if (!is_markable_object(objspace, obj)) return;
gc_pin(objspace, obj);
gc_mark_ptr(objspace, obj);
}
static inline void
gc_mark(rb_objspace_t *objspace, VALUE obj)
{
if (!is_markable_object(objspace, obj)) return;
gc_mark_ptr(objspace, obj);
}
void
rb_gc_mark_movable(VALUE ptr)
{
gc_mark(&rb_objspace, ptr);
}
void
rb_gc_mark(VALUE ptr)
{
gc_mark_and_pin(&rb_objspace, ptr);
}
/* CAUTION: THIS FUNCTION ENABLE *ONLY BEFORE* SWEEPING.
* This function is only for GC_END_MARK timing.
*/
int
rb_objspace_marked_object_p(VALUE obj)
{
return RVALUE_MARKED(obj) ? TRUE : FALSE;
}
static inline void
gc_mark_set_parent(rb_objspace_t *objspace, VALUE obj)
{
#if USE_RGENGC
if (RVALUE_OLD_P(obj)) {
objspace->rgengc.parent_object = obj;
}
else {
objspace->rgengc.parent_object = Qfalse;
}
#endif
}
static void
gc_mark_imemo(rb_objspace_t *objspace, VALUE obj)
{
switch (imemo_type(obj)) {
case imemo_env:
{
const rb_env_t *env = (const rb_env_t *)obj;
GC_ASSERT(VM_ENV_ESCAPED_P(env->ep));
gc_mark_values(objspace, (long)env->env_size, env->env);
VM_ENV_FLAGS_SET(env->ep, VM_ENV_FLAG_WB_REQUIRED);
gc_mark(objspace, (VALUE)rb_vm_env_prev_env(env));
gc_mark(objspace, (VALUE)env->iseq);
}
return;
case imemo_cref:
gc_mark(objspace, RANY(obj)->as.imemo.cref.klass);
gc_mark(objspace, (VALUE)RANY(obj)->as.imemo.cref.next);
gc_mark(objspace, RANY(obj)->as.imemo.cref.refinements);
return;
case imemo_svar:
gc_mark(objspace, RANY(obj)->as.imemo.svar.cref_or_me);
gc_mark(objspace, RANY(obj)->as.imemo.svar.lastline);
gc_mark(objspace, RANY(obj)->as.imemo.svar.backref);
gc_mark(objspace, RANY(obj)->as.imemo.svar.others);
return;
case imemo_throw_data:
gc_mark(objspace, RANY(obj)->as.imemo.throw_data.throw_obj);
return;
case imemo_ifunc:
gc_mark_maybe(objspace, (VALUE)RANY(obj)->as.imemo.ifunc.data);
return;
case imemo_memo:
gc_mark(objspace, RANY(obj)->as.imemo.memo.v1);
gc_mark(objspace, RANY(obj)->as.imemo.memo.v2);
gc_mark_maybe(objspace, RANY(obj)->as.imemo.memo.u3.value);
return;
case imemo_ment:
mark_method_entry(objspace, &RANY(obj)->as.imemo.ment);
return;
case imemo_iseq:
rb_iseq_mark((rb_iseq_t *)obj);
return;
case imemo_tmpbuf:
{
const rb_imemo_tmpbuf_t *m = &RANY(obj)->as.imemo.alloc;
do {
rb_gc_mark_locations(m->ptr, m->ptr + m->cnt);
} while ((m = m->next) != NULL);
}
return;
case imemo_ast:
rb_ast_mark(&RANY(obj)->as.imemo.ast);
return;
case imemo_parser_strterm:
rb_strterm_mark(obj);
return;
#if VM_CHECK_MODE > 0
default:
VM_UNREACHABLE(gc_mark_imemo);
#endif
}
}
static void
gc_mark_children(rb_objspace_t *objspace, VALUE obj)
{
register RVALUE *any = RANY(obj);
gc_mark_set_parent(objspace, obj);
if (FL_TEST(obj, FL_EXIVAR)) {
rb_mark_generic_ivar(obj);
}
switch (BUILTIN_TYPE(obj)) {
case T_FLOAT:
case T_BIGNUM:
case T_SYMBOL:
/* Not immediates, but does not have references and singleton
* class */
return;
case T_NIL:
case T_FIXNUM:
rb_bug("rb_gc_mark() called for broken object");
break;
case T_NODE:
UNEXPECTED_NODE(rb_gc_mark);
break;
case T_IMEMO:
gc_mark_imemo(objspace, obj);
return;
}
gc_mark(objspace, any->as.basic.klass);
switch (BUILTIN_TYPE(obj)) {
case T_CLASS:
case T_MODULE:
mark_m_tbl(objspace, RCLASS_M_TBL(obj));
if (RCLASS_SUPER(obj)) {
gc_mark(objspace, RCLASS_SUPER(obj));
}
if (!RCLASS_EXT(obj)) break;
mark_tbl_no_pin(objspace, RCLASS_IV_TBL(obj));
mark_const_tbl(objspace, RCLASS_CONST_TBL(obj));
break;
case T_ICLASS:
if (FL_TEST(obj, RICLASS_IS_ORIGIN)) {
mark_m_tbl(objspace, RCLASS_M_TBL(obj));
}
if (RCLASS_SUPER(obj)) {
gc_mark(objspace, RCLASS_SUPER(obj));
}
if (!RCLASS_EXT(obj)) break;
mark_m_tbl(objspace, RCLASS_CALLABLE_M_TBL(obj));
break;
case T_ARRAY:
if (FL_TEST(obj, ELTS_SHARED)) {
VALUE root = any->as.array.as.heap.aux.shared_root;
gc_mark(objspace, root);
}
else {
long i, len = RARRAY_LEN(obj);
const VALUE *ptr = RARRAY_CONST_PTR_TRANSIENT(obj);
for (i=0; i < len; i++) {
gc_mark(objspace, ptr[i]);
}
if (objspace->mark_func_data == NULL) {
if (!FL_TEST_RAW(obj, RARRAY_EMBED_FLAG) &&
RARRAY_TRANSIENT_P(obj)) {
rb_transient_heap_mark(obj, ptr);
}
}
}
break;
case T_HASH:
mark_hash(objspace, obj);
break;
case T_STRING:
if (STR_SHARED_P(obj)) {
gc_mark(objspace, any->as.string.as.heap.aux.shared);
}
break;
case T_DATA:
{
void *const ptr = DATA_PTR(obj);
if (ptr) {
RUBY_DATA_FUNC mark_func = RTYPEDDATA_P(obj) ?
any->as.typeddata.type->function.dmark :
any->as.data.dmark;
if (mark_func) (*mark_func)(ptr);
}
}
break;
case T_OBJECT:
{
const VALUE * const ptr = ROBJECT_IVPTR(obj);
if (ptr) {
uint32_t i, len = ROBJECT_NUMIV(obj);
for (i = 0; i < len; i++) {
gc_mark(objspace, ptr[i]);
}
if (objspace->mark_func_data == NULL &&
ROBJ_TRANSIENT_P(obj)) {
rb_transient_heap_mark(obj, ptr);
}
}
}
break;
case T_FILE:
if (any->as.file.fptr) {
gc_mark(objspace, any->as.file.fptr->pathv);
gc_mark(objspace, any->as.file.fptr->tied_io_for_writing);
gc_mark(objspace, any->as.file.fptr->writeconv_asciicompat);
gc_mark(objspace, any->as.file.fptr->writeconv_pre_ecopts);
gc_mark(objspace, any->as.file.fptr->encs.ecopts);
gc_mark(objspace, any->as.file.fptr->write_lock);
}
break;
case T_REGEXP:
gc_mark(objspace, any->as.regexp.src);
break;
case T_MATCH:
gc_mark(objspace, any->as.match.regexp);
if (any->as.match.str) {
gc_mark(objspace, any->as.match.str);
}
break;
case T_RATIONAL:
gc_mark(objspace, any->as.rational.num);
gc_mark(objspace, any->as.rational.den);
break;
case T_COMPLEX:
gc_mark(objspace, any->as.complex.real);
gc_mark(objspace, any->as.complex.imag);
break;
case T_STRUCT:
{
long i;
const long len = RSTRUCT_LEN(obj);
const VALUE * const ptr = RSTRUCT_CONST_PTR(obj);
for (i=0; i<len; i++) {
gc_mark(objspace, ptr[i]);
}
if (objspace->mark_func_data == NULL &&
RSTRUCT_TRANSIENT_P(obj)) {
rb_transient_heap_mark(obj, ptr);
}
}
break;
default:
#if GC_DEBUG
rb_gcdebug_print_obj_condition((VALUE)obj);
#endif
if (BUILTIN_TYPE(obj) == T_MOVED) rb_bug("rb_gc_mark(): %p is T_MOVED", (void *)obj);
if (BUILTIN_TYPE(obj) == T_NONE) rb_bug("rb_gc_mark(): %p is T_NONE", (void *)obj);
if (BUILTIN_TYPE(obj) == T_ZOMBIE) rb_bug("rb_gc_mark(): %p is T_ZOMBIE", (void *)obj);
rb_bug("rb_gc_mark(): unknown data type 0x%x(%p) %s",
BUILTIN_TYPE(obj), (void *)any,
is_pointer_to_heap(objspace, any) ? "corrupted object" : "non object");
}
}
/**
* incremental: 0 -> not incremental (do all)
* incremental: n -> mark at most `n' objects
*/
static inline int
gc_mark_stacked_objects(rb_objspace_t *objspace, int incremental, size_t count)
{
mark_stack_t *mstack = &objspace->mark_stack;
VALUE obj;
#if GC_ENABLE_INCREMENTAL_MARK
size_t marked_slots_at_the_beginning = objspace->marked_slots;
size_t popped_count = 0;
#endif
while (pop_mark_stack(mstack, &obj)) {
if (obj == Qundef) continue; /* skip */
if (RGENGC_CHECK_MODE && !RVALUE_MARKED(obj)) {
rb_bug("gc_mark_stacked_objects: %s is not marked.", obj_info(obj));
}
gc_mark_children(objspace, obj);
#if GC_ENABLE_INCREMENTAL_MARK
if (incremental) {
if (RGENGC_CHECK_MODE && !RVALUE_MARKING(obj)) {
rb_bug("gc_mark_stacked_objects: incremental, but marking bit is 0");
}
CLEAR_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), obj);
popped_count++;
if (popped_count + (objspace->marked_slots - marked_slots_at_the_beginning) > count) {
break;
}
}
else {
/* just ignore marking bits */
}
#endif
}
if (RGENGC_CHECK_MODE >= 3) gc_verify_internal_consistency(objspace);
if (is_mark_stack_empty(mstack)) {
shrink_stack_chunk_cache(mstack);
return TRUE;
}
else {
return FALSE;
}
}
static int
gc_mark_stacked_objects_incremental(rb_objspace_t *objspace, size_t count)
{
return gc_mark_stacked_objects(objspace, TRUE, count);
}
static int
gc_mark_stacked_objects_all(rb_objspace_t *objspace)
{
return gc_mark_stacked_objects(objspace, FALSE, 0);
}
#if PRINT_ROOT_TICKS
#define MAX_TICKS 0x100
static tick_t mark_ticks[MAX_TICKS];
static const char *mark_ticks_categories[MAX_TICKS];
static void
show_mark_ticks(void)
{
int i;
fprintf(stderr, "mark ticks result:\n");
for (i=0; i<MAX_TICKS; i++) {
const char *category = mark_ticks_categories[i];
if (category) {
fprintf(stderr, "%s\t%8lu\n", category, (unsigned long)mark_ticks[i]);
}
else {
break;
}
}
}
#endif /* PRINT_ROOT_TICKS */
static void
gc_mark_roots(rb_objspace_t *objspace, const char **categoryp)
{
struct gc_list *list;
rb_execution_context_t *ec = GET_EC();
rb_vm_t *vm = rb_ec_vm_ptr(ec);
#if PRINT_ROOT_TICKS
tick_t start_tick = tick();
int tick_count = 0;
const char *prev_category = 0;
if (mark_ticks_categories[0] == 0) {
atexit(show_mark_ticks);
}
#endif
if (categoryp) *categoryp = "xxx";
#if USE_RGENGC
objspace->rgengc.parent_object = Qfalse;
#endif
#if PRINT_ROOT_TICKS
#define MARK_CHECKPOINT_PRINT_TICK(category) do { \
if (prev_category) { \
tick_t t = tick(); \
mark_ticks[tick_count] = t - start_tick; \
mark_ticks_categories[tick_count] = prev_category; \
tick_count++; \
} \
prev_category = category; \
start_tick = tick(); \
} while (0)
#else /* PRINT_ROOT_TICKS */
#define MARK_CHECKPOINT_PRINT_TICK(category)
#endif
#define MARK_CHECKPOINT(category) do { \
if (categoryp) *categoryp = category; \
MARK_CHECKPOINT_PRINT_TICK(category); \
} while (0)
MARK_CHECKPOINT("vm");
SET_STACK_END;
rb_vm_mark(vm);
if (vm->self) gc_mark(objspace, vm->self);
MARK_CHECKPOINT("finalizers");
mark_finalizer_tbl(objspace, finalizer_table);
MARK_CHECKPOINT("machine_context");
mark_current_machine_context(objspace, ec);
/* mark protected global variables */
MARK_CHECKPOINT("global_list");
for (list = global_list; list; list = list->next) {
gc_mark_maybe(objspace, *list->varptr);
}
MARK_CHECKPOINT("end_proc");
rb_mark_end_proc();
MARK_CHECKPOINT("global_tbl");
rb_gc_mark_global_tbl();
MARK_CHECKPOINT("object_id");
rb_gc_mark(objspace->next_object_id);
mark_tbl_no_pin(objspace, objspace->obj_to_id_tbl); /* Only mark ids */
if (stress_to_class) rb_gc_mark(stress_to_class);
MARK_CHECKPOINT("finish");
#undef MARK_CHECKPOINT
}
#if RGENGC_CHECK_MODE >= 4
#define MAKE_ROOTSIG(obj) (((VALUE)(obj) << 1) | 0x01)
#define IS_ROOTSIG(obj) ((VALUE)(obj) & 0x01)
#define GET_ROOTSIG(obj) ((const char *)((VALUE)(obj) >> 1))
struct reflist {
VALUE *list;
int pos;
int size;
};
static struct reflist *
reflist_create(VALUE obj)
{
struct reflist *refs = xmalloc(sizeof(struct reflist));
refs->size = 1;
refs->list = ALLOC_N(VALUE, refs->size);
refs->list[0] = obj;
refs->pos = 1;
return refs;
}
static void
reflist_destruct(struct reflist *refs)
{
xfree(refs->list);
xfree(refs);
}
static void
reflist_add(struct reflist *refs, VALUE obj)
{
if (refs->pos == refs->size) {
refs->size *= 2;
SIZED_REALLOC_N(refs->list, VALUE, refs->size, refs->size/2);
}
refs->list[refs->pos++] = obj;
}
static void
reflist_dump(struct reflist *refs)
{
int i;
for (i=0; i<refs->pos; i++) {
VALUE obj = refs->list[i];
if (IS_ROOTSIG(obj)) { /* root */
fprintf(stderr, "<root@%s>", GET_ROOTSIG(obj));
}
else {
fprintf(stderr, "<%s>", obj_info(obj));
}
if (i+1 < refs->pos) fprintf(stderr, ", ");
}
}
static int
reflist_referred_from_machine_context(struct reflist *refs)
{
int i;
for (i=0; i<refs->pos; i++) {
VALUE obj = refs->list[i];
if (IS_ROOTSIG(obj) && strcmp(GET_ROOTSIG(obj), "machine_context") == 0) return 1;
}
return 0;
}
struct allrefs {
rb_objspace_t *objspace;
/* a -> obj1
* b -> obj1
* c -> obj1
* c -> obj2
* d -> obj3
* #=> {obj1 => [a, b, c], obj2 => [c, d]}
*/
struct st_table *references;
const char *category;
VALUE root_obj;
mark_stack_t mark_stack;
};
static int
allrefs_add(struct allrefs *data, VALUE obj)
{
struct reflist *refs;
if (st_lookup(data->references, obj, (st_data_t *)&refs)) {
reflist_add(refs, data->root_obj);
return 0;
}
else {
refs = reflist_create(data->root_obj);
st_insert(data->references, obj, (st_data_t)refs);
return 1;
}
}
static void
allrefs_i(VALUE obj, void *ptr)
{
struct allrefs *data = (struct allrefs *)ptr;
if (allrefs_add(data, obj)) {
push_mark_stack(&data->mark_stack, obj);
}
}
static void
allrefs_roots_i(VALUE obj, void *ptr)
{
struct allrefs *data = (struct allrefs *)ptr;
if (strlen(data->category) == 0) rb_bug("!!!");
data->root_obj = MAKE_ROOTSIG(data->category);
if (allrefs_add(data, obj)) {
push_mark_stack(&data->mark_stack, obj);
}
}
static st_table *
objspace_allrefs(rb_objspace_t *objspace)
{
struct allrefs data;
struct mark_func_data_struct mfd;
VALUE obj;
int prev_dont_gc = dont_gc;
dont_gc = TRUE;
data.objspace = objspace;
data.references = st_init_numtable();
init_mark_stack(&data.mark_stack);
mfd.mark_func = allrefs_roots_i;
mfd.data = &data;
/* traverse root objects */
PUSH_MARK_FUNC_DATA(&mfd);
objspace->mark_func_data = &mfd;
gc_mark_roots(objspace, &data.category);
POP_MARK_FUNC_DATA();
/* traverse rest objects reachable from root objects */
while (pop_mark_stack(&data.mark_stack, &obj)) {
rb_objspace_reachable_objects_from(data.root_obj = obj, allrefs_i, &data);
}
free_stack_chunks(&data.mark_stack);
dont_gc = prev_dont_gc;
return data.references;
}
static int
objspace_allrefs_destruct_i(st_data_t key, st_data_t value, void *ptr)
{
struct reflist *refs = (struct reflist *)value;
reflist_destruct(refs);
return ST_CONTINUE;
}
static void
objspace_allrefs_destruct(struct st_table *refs)
{
st_foreach(refs, objspace_allrefs_destruct_i, 0);
st_free_table(refs);
}
#if RGENGC_CHECK_MODE >= 5
static int
allrefs_dump_i(st_data_t k, st_data_t v, st_data_t ptr)
{
VALUE obj = (VALUE)k;
struct reflist *refs = (struct reflist *)v;
fprintf(stderr, "[allrefs_dump_i] %s <- ", obj_info(obj));
reflist_dump(refs);
fprintf(stderr, "\n");
return ST_CONTINUE;
}
static void
allrefs_dump(rb_objspace_t *objspace)
{
fprintf(stderr, "[all refs] (size: %d)\n", (int)objspace->rgengc.allrefs_table->num_entries);
st_foreach(objspace->rgengc.allrefs_table, allrefs_dump_i, 0);
}
#endif
static int
gc_check_after_marks_i(st_data_t k, st_data_t v, void *ptr)
{
VALUE obj = k;
struct reflist *refs = (struct reflist *)v;
rb_objspace_t *objspace = (rb_objspace_t *)ptr;
/* object should be marked or oldgen */
if (!MARKED_IN_BITMAP(GET_HEAP_MARK_BITS(obj), obj)) {
fprintf(stderr, "gc_check_after_marks_i: %s is not marked and not oldgen.\n", obj_info(obj));
fprintf(stderr, "gc_check_after_marks_i: %p is referred from ", (void *)obj);
reflist_dump(refs);
if (reflist_referred_from_machine_context(refs)) {
fprintf(stderr, " (marked from machine stack).\n");
/* marked from machine context can be false positive */
}
else {
objspace->rgengc.error_count++;
fprintf(stderr, "\n");
}
}
return ST_CONTINUE;
}
static void
gc_marks_check(rb_objspace_t *objspace, st_foreach_callback_func *checker_func, const char *checker_name)
{
size_t saved_malloc_increase = objspace->malloc_params.increase;
#if RGENGC_ESTIMATE_OLDMALLOC
size_t saved_oldmalloc_increase = objspace->rgengc.oldmalloc_increase;
#endif
VALUE already_disabled = rb_gc_disable();
objspace->rgengc.allrefs_table = objspace_allrefs(objspace);
if (checker_func) {
st_foreach(objspace->rgengc.allrefs_table, checker_func, (st_data_t)objspace);
}
if (objspace->rgengc.error_count > 0) {
#if RGENGC_CHECK_MODE >= 5
allrefs_dump(objspace);
#endif
if (checker_name) rb_bug("%s: GC has problem.", checker_name);
}
objspace_allrefs_destruct(objspace->rgengc.allrefs_table);
objspace->rgengc.allrefs_table = 0;
if (already_disabled == Qfalse) rb_gc_enable();
objspace->malloc_params.increase = saved_malloc_increase;
#if RGENGC_ESTIMATE_OLDMALLOC
objspace->rgengc.oldmalloc_increase = saved_oldmalloc_increase;
#endif
}
#endif /* RGENGC_CHECK_MODE >= 4 */
struct verify_internal_consistency_struct {
rb_objspace_t *objspace;
int err_count;
size_t live_object_count;
size_t zombie_object_count;
#if USE_RGENGC
VALUE parent;
size_t old_object_count;
size_t remembered_shady_count;
#endif
};
#if USE_RGENGC
static void
check_generation_i(const VALUE child, void *ptr)
{
struct verify_internal_consistency_struct *data = (struct verify_internal_consistency_struct *)ptr;
const VALUE parent = data->parent;
if (RGENGC_CHECK_MODE) GC_ASSERT(RVALUE_OLD_P(parent));
if (!RVALUE_OLD_P(child)) {
if (!RVALUE_REMEMBERED(parent) &&
!RVALUE_REMEMBERED(child) &&
!RVALUE_UNCOLLECTIBLE(child)) {
fprintf(stderr, "verify_internal_consistency_reachable_i: WB miss (O->Y) %s -> %s\n", obj_info(parent), obj_info(child));
data->err_count++;
}
}
}
static void
check_color_i(const VALUE child, void *ptr)
{
struct verify_internal_consistency_struct *data = (struct verify_internal_consistency_struct *)ptr;
const VALUE parent = data->parent;
if (!RVALUE_WB_UNPROTECTED(parent) && RVALUE_WHITE_P(child)) {
fprintf(stderr, "verify_internal_consistency_reachable_i: WB miss (B->W) - %s -> %s\n",
obj_info(parent), obj_info(child));
data->err_count++;
}
}
#endif
static void
check_children_i(const VALUE child, void *ptr)
{
struct verify_internal_consistency_struct *data = (struct verify_internal_consistency_struct *)ptr;
if (check_rvalue_consistency_force(child, FALSE) != 0) {
fprintf(stderr, "check_children_i: %s has error (referenced from %s)",
obj_info(child), obj_info(data->parent));
rb_print_backtrace(); /* C backtrace will help to debug */
data->err_count++;
}
}
static int
verify_internal_consistency_i(void *page_start, void *page_end, size_t stride, void *ptr)
{
struct verify_internal_consistency_struct *data = (struct verify_internal_consistency_struct *)ptr;
VALUE obj;
rb_objspace_t *objspace = data->objspace;
for (obj = (VALUE)page_start; obj != (VALUE)page_end; obj += stride) {
void *poisoned = asan_poisoned_object_p(obj);
asan_unpoison_object(obj, false);
if (is_live_object(objspace, obj)) {
/* count objects */
data->live_object_count++;
data->parent = obj;
/* Normally, we don't expect T_MOVED objects to be in the heap.
* But they can stay alive on the stack, */
if (!gc_object_moved_p(objspace, obj)) {
/* moved slots don't have children */
rb_objspace_reachable_objects_from(obj, check_children_i, (void *)data);
}
#if USE_RGENGC
/* check health of children */
if (RVALUE_OLD_P(obj)) data->old_object_count++;
if (RVALUE_WB_UNPROTECTED(obj) && RVALUE_UNCOLLECTIBLE(obj)) data->remembered_shady_count++;
if (!is_marking(objspace) && RVALUE_OLD_P(obj)) {
/* reachable objects from an oldgen object should be old or (young with remember) */
data->parent = obj;
rb_objspace_reachable_objects_from(obj, check_generation_i, (void *)data);
}
if (is_incremental_marking(objspace)) {
if (RVALUE_BLACK_P(obj)) {
/* reachable objects from black objects should be black or grey objects */
data->parent = obj;
rb_objspace_reachable_objects_from(obj, check_color_i, (void *)data);
}
}
#endif
}
else {
if (BUILTIN_TYPE(obj) == T_ZOMBIE) {
GC_ASSERT((RBASIC(obj)->flags & ~FL_SEEN_OBJ_ID) == T_ZOMBIE);
data->zombie_object_count++;
}
}
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE(obj) == T_NONE);
asan_poison_object(obj);
}
}
return 0;
}
static int
gc_verify_heap_page(rb_objspace_t *objspace, struct heap_page *page, VALUE obj)
{
#if USE_RGENGC
int i;
unsigned int has_remembered_shady = FALSE;
unsigned int has_remembered_old = FALSE;
int remembered_old_objects = 0;
int free_objects = 0;
int zombie_objects = 0;
for (i=0; i<page->total_slots; i++) {
VALUE val = (VALUE)&page->start[i];
void *poisoned = asan_poisoned_object_p(val);
asan_unpoison_object(val, false);
if (RBASIC(val) == 0) free_objects++;
if (BUILTIN_TYPE(val) == T_ZOMBIE) zombie_objects++;
if (RVALUE_PAGE_UNCOLLECTIBLE(page, val) && RVALUE_PAGE_WB_UNPROTECTED(page, val)) {
has_remembered_shady = TRUE;
}
if (RVALUE_PAGE_MARKING(page, val)) {
has_remembered_old = TRUE;
remembered_old_objects++;
}
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE(val) == T_NONE);
asan_poison_object(val);
}
}
if (!is_incremental_marking(objspace) &&
page->flags.has_remembered_objects == FALSE && has_remembered_old == TRUE) {
for (i=0; i<page->total_slots; i++) {
VALUE val = (VALUE)&page->start[i];
if (RVALUE_PAGE_MARKING(page, val)) {
fprintf(stderr, "marking -> %s\n", obj_info(val));
}
}
rb_bug("page %p's has_remembered_objects should be false, but there are remembered old objects (%d). %s",
(void *)page, remembered_old_objects, obj ? obj_info(obj) : "");
}
if (page->flags.has_uncollectible_shady_objects == FALSE && has_remembered_shady == TRUE) {
rb_bug("page %p's has_remembered_shady should be false, but there are remembered shady objects. %s",
(void *)page, obj ? obj_info(obj) : "");
}
if (0) {
/* free_slots may not equal to free_objects */
if (page->free_slots != free_objects) {
rb_bug("page %p's free_slots should be %d, but %d\n", (void *)page, (int)page->free_slots, free_objects);
}
}
if (page->final_slots != zombie_objects) {
rb_bug("page %p's final_slots should be %d, but %d\n", (void *)page, (int)page->final_slots, zombie_objects);
}
return remembered_old_objects;
#else
return 0;
#endif
}
static int
gc_verify_heap_pages_(rb_objspace_t *objspace, struct list_head *head)
{
int remembered_old_objects = 0;
struct heap_page *page = 0;
list_for_each(head, page, page_node) {
asan_unpoison_memory_region(&page->freelist, sizeof(RVALUE*), false);
RVALUE *p = page->freelist;
while (p) {
RVALUE *prev = p;
asan_unpoison_object((VALUE)p, false);
if (BUILTIN_TYPE(p) != T_NONE) {
fprintf(stderr, "freelist slot expected to be T_NONE but was: %s\n", obj_info((VALUE)p));
}
p = p->as.free.next;
asan_poison_object((VALUE)prev);
}
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
if (page->flags.has_remembered_objects == FALSE) {
remembered_old_objects += gc_verify_heap_page(objspace, page, Qfalse);
}
}
return remembered_old_objects;
}
static int
gc_verify_heap_pages(rb_objspace_t *objspace)
{
int remembered_old_objects = 0;
remembered_old_objects += gc_verify_heap_pages_(objspace, &heap_eden->pages);
remembered_old_objects += gc_verify_heap_pages_(objspace, &heap_tomb->pages);
return remembered_old_objects;
}
/*
* call-seq:
* GC.verify_internal_consistency -> nil
*
* Verify internal consistency.
*
* This method is implementation specific.
* Now this method checks generational consistency
* if RGenGC is supported.
*/
static VALUE
gc_verify_internal_consistency_m(VALUE dummy)
{
gc_verify_internal_consistency(&rb_objspace);
return Qnil;
}
static void
gc_verify_internal_consistency(rb_objspace_t *objspace)
{
struct verify_internal_consistency_struct data = {0};
data.objspace = objspace;
gc_report(5, objspace, "gc_verify_internal_consistency: start\n");
/* check relations */
objspace_each_objects_without_setup(objspace, verify_internal_consistency_i, &data);
if (data.err_count != 0) {
#if RGENGC_CHECK_MODE >= 5
objspace->rgengc.error_count = data.err_count;
gc_marks_check(objspace, NULL, NULL);
allrefs_dump(objspace);
#endif
rb_bug("gc_verify_internal_consistency: found internal inconsistency.");
}
/* check heap_page status */
gc_verify_heap_pages(objspace);
/* check counters */
if (!is_lazy_sweeping(heap_eden) && !finalizing) {
if (objspace_live_slots(objspace) != data.live_object_count) {
fprintf(stderr, "heap_pages_final_slots: %d, objspace->profile.total_freed_objects: %d\n",
(int)heap_pages_final_slots, (int)objspace->profile.total_freed_objects);
rb_bug("inconsistent live slot number: expect %"PRIuSIZE", but %"PRIuSIZE".", objspace_live_slots(objspace), data.live_object_count);
}
}
#if USE_RGENGC
if (!is_marking(objspace)) {
if (objspace->rgengc.old_objects != data.old_object_count) {
rb_bug("inconsistent old slot number: expect %"PRIuSIZE", but %"PRIuSIZE".", objspace->rgengc.old_objects, data.old_object_count);
}
if (objspace->rgengc.uncollectible_wb_unprotected_objects != data.remembered_shady_count) {
rb_bug("inconsistent old slot number: expect %"PRIuSIZE", but %"PRIuSIZE".", objspace->rgengc.uncollectible_wb_unprotected_objects, data.remembered_shady_count);
}
}
#endif
if (!finalizing) {
size_t list_count = 0;
{
VALUE z = heap_pages_deferred_final;
while (z) {
list_count++;
z = RZOMBIE(z)->next;
}
}
if (heap_pages_final_slots != data.zombie_object_count ||
heap_pages_final_slots != list_count) {
rb_bug("inconsistent finalizing object count:\n"
" expect %"PRIuSIZE"\n"
" but %"PRIuSIZE" zombies\n"
" heap_pages_deferred_final list has %"PRIuSIZE" items.",
heap_pages_final_slots,
data.zombie_object_count,
list_count);
}
}
gc_report(5, objspace, "gc_verify_internal_consistency: OK\n");
}
void
rb_gc_verify_internal_consistency(void)
{
gc_verify_internal_consistency(&rb_objspace);
}
static VALUE
gc_verify_transient_heap_internal_consistency(VALUE dmy)
{
rb_transient_heap_verify();
return Qnil;
}
/* marks */
static void
gc_marks_start(rb_objspace_t *objspace, int full_mark)
{
/* start marking */
gc_report(1, objspace, "gc_marks_start: (%s)\n", full_mark ? "full" : "minor");
gc_mode_transition(objspace, gc_mode_marking);
#if USE_RGENGC
if (full_mark) {
#if GC_ENABLE_INCREMENTAL_MARK
objspace->rincgc.step_slots = (objspace->marked_slots * 2) / ((objspace->rincgc.pooled_slots / HEAP_PAGE_OBJ_LIMIT) + 1);
if (0) fprintf(stderr, "objspace->marked_slots: %d, objspace->rincgc.pooled_page_num: %d, objspace->rincgc.step_slots: %d, \n",
(int)objspace->marked_slots, (int)objspace->rincgc.pooled_slots, (int)objspace->rincgc.step_slots);
#endif
objspace->flags.during_minor_gc = FALSE;
objspace->profile.major_gc_count++;
objspace->rgengc.uncollectible_wb_unprotected_objects = 0;
objspace->rgengc.old_objects = 0;
objspace->rgengc.last_major_gc = objspace->profile.count;
objspace->marked_slots = 0;
rgengc_mark_and_rememberset_clear(objspace, heap_eden);
}
else {
objspace->flags.during_minor_gc = TRUE;
objspace->marked_slots =
objspace->rgengc.old_objects + objspace->rgengc.uncollectible_wb_unprotected_objects; /* uncollectible objects are marked already */
objspace->profile.minor_gc_count++;
rgengc_rememberset_mark(objspace, heap_eden);
}
#endif
gc_mark_roots(objspace, NULL);
gc_report(1, objspace, "gc_marks_start: (%s) end, stack in %d\n", full_mark ? "full" : "minor", (int)mark_stack_size(&objspace->mark_stack));
}
#if GC_ENABLE_INCREMENTAL_MARK
static void
gc_marks_wb_unprotected_objects(rb_objspace_t *objspace)
{
struct heap_page *page = 0;
list_for_each(&heap_eden->pages, page, page_node) {
bits_t *mark_bits = page->mark_bits;
bits_t *wbun_bits = page->wb_unprotected_bits;
RVALUE *p = page->start;
RVALUE *offset = p - NUM_IN_PAGE(p);
size_t j;
for (j=0; j<HEAP_PAGE_BITMAP_LIMIT; j++) {
bits_t bits = mark_bits[j] & wbun_bits[j];
if (bits) {
p = offset + j * BITS_BITLENGTH;
do {
if (bits & 1) {
gc_report(2, objspace, "gc_marks_wb_unprotected_objects: marked shady: %s\n", obj_info((VALUE)p));
GC_ASSERT(RVALUE_WB_UNPROTECTED((VALUE)p));
GC_ASSERT(RVALUE_MARKED((VALUE)p));
gc_mark_children(objspace, (VALUE)p);
}
p++;
bits >>= 1;
} while (bits);
}
}
}
gc_mark_stacked_objects_all(objspace);
}
static struct heap_page *
heap_move_pooled_pages_to_free_pages(rb_heap_t *heap)
{
struct heap_page *page = heap->pooled_pages;
if (page) {
heap->pooled_pages = page->free_next;
page->free_next = heap->free_pages;
heap->free_pages = page;
}
return page;
}
#endif
static int
gc_marks_finish(rb_objspace_t *objspace)
{
#if GC_ENABLE_INCREMENTAL_MARK
/* finish incremental GC */
if (is_incremental_marking(objspace)) {
if (heap_eden->pooled_pages) {
heap_move_pooled_pages_to_free_pages(heap_eden);
gc_report(1, objspace, "gc_marks_finish: pooled pages are exists. retry.\n");
return FALSE; /* continue marking phase */
}
if (RGENGC_CHECK_MODE && is_mark_stack_empty(&objspace->mark_stack) == 0) {
rb_bug("gc_marks_finish: mark stack is not empty (%d).", (int)mark_stack_size(&objspace->mark_stack));
}
gc_mark_roots(objspace, 0);
if (is_mark_stack_empty(&objspace->mark_stack) == FALSE) {
gc_report(1, objspace, "gc_marks_finish: not empty (%d). retry.\n", (int)mark_stack_size(&objspace->mark_stack));
return FALSE;
}
#if RGENGC_CHECK_MODE >= 2
if (gc_verify_heap_pages(objspace) != 0) {
rb_bug("gc_marks_finish (incremental): there are remembered old objects.");
}
#endif
objspace->flags.during_incremental_marking = FALSE;
/* check children of all marked wb-unprotected objects */
gc_marks_wb_unprotected_objects(objspace);
}
#endif /* GC_ENABLE_INCREMENTAL_MARK */
#if RGENGC_CHECK_MODE >= 2
gc_verify_internal_consistency(objspace);
#endif
#if USE_RGENGC
if (is_full_marking(objspace)) {
/* See the comment about RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR */
const double r = gc_params.oldobject_limit_factor;
objspace->rgengc.uncollectible_wb_unprotected_objects_limit = (size_t)(objspace->rgengc.uncollectible_wb_unprotected_objects * r);
objspace->rgengc.old_objects_limit = (size_t)(objspace->rgengc.old_objects * r);
}
#endif
#if RGENGC_CHECK_MODE >= 4
gc_marks_check(objspace, gc_check_after_marks_i, "after_marks");
#endif
{
/* decide full GC is needed or not */
rb_heap_t *heap = heap_eden;
size_t total_slots = heap_allocatable_pages * HEAP_PAGE_OBJ_LIMIT + heap->total_slots;
size_t sweep_slots = total_slots - objspace->marked_slots; /* will be swept slots */
size_t max_free_slots = (size_t)(total_slots * gc_params.heap_free_slots_max_ratio);
size_t min_free_slots = (size_t)(total_slots * gc_params.heap_free_slots_min_ratio);
int full_marking = is_full_marking(objspace);
GC_ASSERT(heap->total_slots >= objspace->marked_slots);
/* setup free-able page counts */
if (max_free_slots < gc_params.heap_init_slots) max_free_slots = gc_params.heap_init_slots;
if (sweep_slots > max_free_slots) {
heap_pages_freeable_pages = (sweep_slots - max_free_slots) / HEAP_PAGE_OBJ_LIMIT;
}
else {
heap_pages_freeable_pages = 0;
}
/* check free_min */
if (min_free_slots < gc_params.heap_free_slots) min_free_slots = gc_params.heap_free_slots;
#if USE_RGENGC
if (sweep_slots < min_free_slots) {
if (!full_marking) {
if (objspace->profile.count - objspace->rgengc.last_major_gc < RVALUE_OLD_AGE) {
full_marking = TRUE;
/* do not update last_major_gc, because full marking is not done. */
goto increment;
}
else {
gc_report(1, objspace, "gc_marks_finish: next is full GC!!)\n");
objspace->rgengc.need_major_gc |= GPR_FLAG_MAJOR_BY_NOFREE;
}
}
else {
increment:
gc_report(1, objspace, "gc_marks_finish: heap_set_increment!!\n");
heap_set_increment(objspace, heap_extend_pages(objspace, sweep_slots, total_slots));
heap_increment(objspace, heap);
}
}
if (full_marking) {
/* See the comment about RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR */
const double r = gc_params.oldobject_limit_factor;
objspace->rgengc.uncollectible_wb_unprotected_objects_limit = (size_t)(objspace->rgengc.uncollectible_wb_unprotected_objects * r);
objspace->rgengc.old_objects_limit = (size_t)(objspace->rgengc.old_objects * r);
}
if (objspace->rgengc.uncollectible_wb_unprotected_objects > objspace->rgengc.uncollectible_wb_unprotected_objects_limit) {
objspace->rgengc.need_major_gc |= GPR_FLAG_MAJOR_BY_SHADY;
}
if (objspace->rgengc.old_objects > objspace->rgengc.old_objects_limit) {
objspace->rgengc.need_major_gc |= GPR_FLAG_MAJOR_BY_OLDGEN;
}
if (RGENGC_FORCE_MAJOR_GC) {
objspace->rgengc.need_major_gc = GPR_FLAG_MAJOR_BY_FORCE;
}
gc_report(1, objspace, "gc_marks_finish (marks %d objects, old %d objects, total %d slots, sweep %d slots, increment: %d, next GC: %s)\n",
(int)objspace->marked_slots, (int)objspace->rgengc.old_objects, (int)heap->total_slots, (int)sweep_slots, (int)heap_allocatable_pages,
objspace->rgengc.need_major_gc ? "major" : "minor");
#else /* USE_RGENGC */
if (sweep_slots < min_free_slots) {
gc_report(1, objspace, "gc_marks_finish: heap_set_increment!!\n");
heap_set_increment(objspace, heap_extend_pages(objspace, sweep_slot, total_slot));
heap_increment(objspace, heap);
}
#endif
}
rb_transient_heap_finish_marking();
gc_event_hook(objspace, RUBY_INTERNAL_EVENT_GC_END_MARK, 0);
return TRUE;
}
static void
gc_marks_step(rb_objspace_t *objspace, int slots)
{
#if GC_ENABLE_INCREMENTAL_MARK
GC_ASSERT(is_marking(objspace));
if (gc_mark_stacked_objects_incremental(objspace, slots)) {
if (gc_marks_finish(objspace)) {
/* finish */
gc_sweep(objspace);
}
}
if (0) fprintf(stderr, "objspace->marked_slots: %d\n", (int)objspace->marked_slots);
#endif
}
static void
gc_marks_rest(rb_objspace_t *objspace)
{
gc_report(1, objspace, "gc_marks_rest\n");
#if GC_ENABLE_INCREMENTAL_MARK
heap_eden->pooled_pages = NULL;
#endif
if (is_incremental_marking(objspace)) {
do {
while (gc_mark_stacked_objects_incremental(objspace, INT_MAX) == FALSE);
} while (gc_marks_finish(objspace) == FALSE);
}
else {
gc_mark_stacked_objects_all(objspace);
gc_marks_finish(objspace);
}
/* move to sweep */
gc_sweep(objspace);
}
static void
gc_marks_continue(rb_objspace_t *objspace, rb_heap_t *heap)
{
GC_ASSERT(dont_gc == FALSE);
#if GC_ENABLE_INCREMENTAL_MARK
gc_enter(objspace, "marks_continue");
PUSH_MARK_FUNC_DATA(NULL);
{
int slots = 0;
const char *from;
if (heap->pooled_pages) {
while (heap->pooled_pages && slots < HEAP_PAGE_OBJ_LIMIT) {
struct heap_page *page = heap_move_pooled_pages_to_free_pages(heap);
slots += page->free_slots;
}
from = "pooled-pages";
}
else if (heap_increment(objspace, heap)) {
slots = heap->free_pages->free_slots;
from = "incremented-pages";
}
if (slots > 0) {
gc_report(2, objspace, "gc_marks_continue: provide %d slots from %s.\n", slots, from);
gc_marks_step(objspace, (int)objspace->rincgc.step_slots);
}
else {
gc_report(2, objspace, "gc_marks_continue: no more pooled pages (stack depth: %d).\n", (int)mark_stack_size(&objspace->mark_stack));
gc_marks_rest(objspace);
}
}
POP_MARK_FUNC_DATA();
gc_exit(objspace, "marks_continue");
#endif
}
static void
gc_marks(rb_objspace_t *objspace, int full_mark)
{
gc_prof_mark_timer_start(objspace);
PUSH_MARK_FUNC_DATA(NULL);
{
/* setup marking */
#if USE_RGENGC
gc_marks_start(objspace, full_mark);
if (!is_incremental_marking(objspace)) {
gc_marks_rest(objspace);
}
#if RGENGC_PROFILE > 0
if (gc_prof_record(objspace)) {
gc_profile_record *record = gc_prof_record(objspace);
record->old_objects = objspace->rgengc.old_objects;
}
#endif
#else /* USE_RGENGC */
gc_marks_start(objspace, TRUE);
gc_marks_rest(objspace);
#endif
}
POP_MARK_FUNC_DATA();
gc_prof_mark_timer_stop(objspace);
}
/* RGENGC */
static void
gc_report_body(int level, rb_objspace_t *objspace, const char *fmt, ...)
{
if (level <= RGENGC_DEBUG) {
char buf[1024];
FILE *out = stderr;
va_list args;
const char *status = " ";
#if USE_RGENGC
if (during_gc) {
status = is_full_marking(objspace) ? "+" : "-";
}
else {
if (is_lazy_sweeping(heap_eden)) {
status = "S";
}
if (is_incremental_marking(objspace)) {
status = "M";
}
}
#endif
va_start(args, fmt);
vsnprintf(buf, 1024, fmt, args);
va_end(args);
fprintf(out, "%s|", status);
fputs(buf, out);
}
}
#if USE_RGENGC
/* bit operations */
static int
rgengc_remembersetbits_get(rb_objspace_t *objspace, VALUE obj)
{
return RVALUE_REMEMBERED(obj);
}
static int
rgengc_remembersetbits_set(rb_objspace_t *objspace, VALUE obj)
{
struct heap_page *page = GET_HEAP_PAGE(obj);
bits_t *bits = &page->marking_bits[0];
GC_ASSERT(!is_incremental_marking(objspace));
if (MARKED_IN_BITMAP(bits, obj)) {
return FALSE;
}
else {
page->flags.has_remembered_objects = TRUE;
MARK_IN_BITMAP(bits, obj);
return TRUE;
}
}
/* wb, etc */
/* return FALSE if already remembered */
static int
rgengc_remember(rb_objspace_t *objspace, VALUE obj)
{
gc_report(6, objspace, "rgengc_remember: %s %s\n", obj_info(obj),
rgengc_remembersetbits_get(objspace, obj) ? "was already remembered" : "is remembered now");
check_rvalue_consistency(obj);
if (RGENGC_CHECK_MODE) {
if (RVALUE_WB_UNPROTECTED(obj)) rb_bug("rgengc_remember: %s is not wb protected.", obj_info(obj));
}
#if RGENGC_PROFILE > 0
if (!rgengc_remembered(objspace, obj)) {
if (RVALUE_WB_UNPROTECTED(obj) == 0) {
objspace->profile.total_remembered_normal_object_count++;
#if RGENGC_PROFILE >= 2
objspace->profile.remembered_normal_object_count_types[BUILTIN_TYPE(obj)]++;
#endif
}
}
#endif /* RGENGC_PROFILE > 0 */
return rgengc_remembersetbits_set(objspace, obj);
}
static int
rgengc_remembered_sweep(rb_objspace_t *objspace, VALUE obj)
{
int result = rgengc_remembersetbits_get(objspace, obj);
check_rvalue_consistency(obj);
return result;
}
static int
rgengc_remembered(rb_objspace_t *objspace, VALUE obj)
{
gc_report(6, objspace, "rgengc_remembered: %s\n", obj_info(obj));
return rgengc_remembered_sweep(objspace, obj);
}
#ifndef PROFILE_REMEMBERSET_MARK
#define PROFILE_REMEMBERSET_MARK 0
#endif
static void
rgengc_rememberset_mark(rb_objspace_t *objspace, rb_heap_t *heap)
{
size_t j;
struct heap_page *page = 0;
#if PROFILE_REMEMBERSET_MARK
int has_old = 0, has_shady = 0, has_both = 0, skip = 0;
#endif
gc_report(1, objspace, "rgengc_rememberset_mark: start\n");
list_for_each(&heap->pages, page, page_node) {
if (page->flags.has_remembered_objects | page->flags.has_uncollectible_shady_objects) {
RVALUE *p = page->start;
RVALUE *offset = p - NUM_IN_PAGE(p);
bits_t bitset, bits[HEAP_PAGE_BITMAP_LIMIT];
bits_t *marking_bits = page->marking_bits;
bits_t *uncollectible_bits = page->uncollectible_bits;
bits_t *wb_unprotected_bits = page->wb_unprotected_bits;
#if PROFILE_REMEMBERSET_MARK
if (page->flags.has_remembered_objects && page->flags.has_uncollectible_shady_objects) has_both++;
else if (page->flags.has_remembered_objects) has_old++;
else if (page->flags.has_uncollectible_shady_objects) has_shady++;
#endif
for (j=0; j<HEAP_PAGE_BITMAP_LIMIT; j++) {
bits[j] = marking_bits[j] | (uncollectible_bits[j] & wb_unprotected_bits[j]);
marking_bits[j] = 0;
}
page->flags.has_remembered_objects = FALSE;
for (j=0; j < HEAP_PAGE_BITMAP_LIMIT; j++) {
bitset = bits[j];
if (bitset) {
p = offset + j * BITS_BITLENGTH;
do {
if (bitset & 1) {
VALUE obj = (VALUE)p;
gc_report(2, objspace, "rgengc_rememberset_mark: mark %s\n", obj_info(obj));
GC_ASSERT(RVALUE_UNCOLLECTIBLE(obj));
GC_ASSERT(RVALUE_OLD_P(obj) || RVALUE_WB_UNPROTECTED(obj));
gc_mark_children(objspace, obj);
}
p++;
bitset >>= 1;
} while (bitset);
}
}
}
#if PROFILE_REMEMBERSET_MARK
else {
skip++;
}
#endif
}
#if PROFILE_REMEMBERSET_MARK
fprintf(stderr, "%d\t%d\t%d\t%d\n", has_both, has_old, has_shady, skip);
#endif
gc_report(1, objspace, "rgengc_rememberset_mark: finished\n");
}
static void
rgengc_mark_and_rememberset_clear(rb_objspace_t *objspace, rb_heap_t *heap)
{
struct heap_page *page = 0;
list_for_each(&heap->pages, page, page_node) {
memset(&page->mark_bits[0], 0, HEAP_PAGE_BITMAP_SIZE);
memset(&page->uncollectible_bits[0], 0, HEAP_PAGE_BITMAP_SIZE);
memset(&page->marking_bits[0], 0, HEAP_PAGE_BITMAP_SIZE);
memset(&page->pinned_bits[0], 0, HEAP_PAGE_BITMAP_SIZE);
page->flags.has_uncollectible_shady_objects = FALSE;
page->flags.has_remembered_objects = FALSE;
}
}
/* RGENGC: APIs */
NOINLINE(static void gc_writebarrier_generational(VALUE a, VALUE b, rb_objspace_t *objspace));
static void
gc_writebarrier_generational(VALUE a, VALUE b, rb_objspace_t *objspace)
{
if (RGENGC_CHECK_MODE) {
if (!RVALUE_OLD_P(a)) rb_bug("gc_writebarrier_generational: %s is not an old object.", obj_info(a));
if ( RVALUE_OLD_P(b)) rb_bug("gc_writebarrier_generational: %s is an old object.", obj_info(b));
if (is_incremental_marking(objspace)) rb_bug("gc_writebarrier_generational: called while incremental marking: %s -> %s", obj_info(a), obj_info(b));
}
#if 1
/* mark `a' and remember (default behavior) */
if (!rgengc_remembered(objspace, a)) {
rgengc_remember(objspace, a);
gc_report(1, objspace, "gc_writebarrier_generational: %s (remembered) -> %s\n", obj_info(a), obj_info(b));
}
#else
/* mark `b' and remember */
MARK_IN_BITMAP(GET_HEAP_MARK_BITS(b), b);
if (RVALUE_WB_UNPROTECTED(b)) {
gc_remember_unprotected(objspace, b);
}
else {
RVALUE_AGE_SET_OLD(objspace, b);
rgengc_remember(objspace, b);
}
gc_report(1, objspace, "gc_writebarrier_generational: %s -> %s (remembered)\n", obj_info(a), obj_info(b));
#endif
check_rvalue_consistency(a);
check_rvalue_consistency(b);
}
#if GC_ENABLE_INCREMENTAL_MARK
static void
gc_mark_from(rb_objspace_t *objspace, VALUE obj, VALUE parent)
{
gc_mark_set_parent(objspace, parent);
rgengc_check_relation(objspace, obj);
if (gc_mark_set(objspace, obj) == FALSE) return;
gc_aging(objspace, obj);
gc_grey(objspace, obj);
}
NOINLINE(static void gc_writebarrier_incremental(VALUE a, VALUE b, rb_objspace_t *objspace));
static void
gc_writebarrier_incremental(VALUE a, VALUE b, rb_objspace_t *objspace)
{
gc_report(2, objspace, "gc_writebarrier_incremental: [LG] %p -> %s\n", (void *)a, obj_info(b));
if (RVALUE_BLACK_P(a)) {
if (RVALUE_WHITE_P(b)) {
if (!RVALUE_WB_UNPROTECTED(a)) {
gc_report(2, objspace, "gc_writebarrier_incremental: [IN] %p -> %s\n", (void *)a, obj_info(b));
gc_mark_from(objspace, b, a);
}
}
else if (RVALUE_OLD_P(a) && !RVALUE_OLD_P(b)) {
if (!RVALUE_WB_UNPROTECTED(b)) {
gc_report(1, objspace, "gc_writebarrier_incremental: [GN] %p -> %s\n", (void *)a, obj_info(b));
RVALUE_AGE_SET_OLD(objspace, b);
if (RVALUE_BLACK_P(b)) {
gc_grey(objspace, b);
}
}
else {
gc_report(1, objspace, "gc_writebarrier_incremental: [LL] %p -> %s\n", (void *)a, obj_info(b));
gc_remember_unprotected(objspace, b);
}
}
}
}
#else
#define gc_writebarrier_incremental(a, b, objspace)
#endif
void
rb_gc_writebarrier(VALUE a, VALUE b)
{
rb_objspace_t *objspace = &rb_objspace;
if (RGENGC_CHECK_MODE && SPECIAL_CONST_P(a)) rb_bug("rb_gc_writebarrier: a is special const");
if (RGENGC_CHECK_MODE && SPECIAL_CONST_P(b)) rb_bug("rb_gc_writebarrier: b is special const");
if (!is_incremental_marking(objspace)) {
if (!RVALUE_OLD_P(a) || RVALUE_OLD_P(b)) {
return;
}
else {
gc_writebarrier_generational(a, b, objspace);
}
}
else { /* slow path */
gc_writebarrier_incremental(a, b, objspace);
}
}
void
rb_gc_writebarrier_unprotect(VALUE obj)
{
if (RVALUE_WB_UNPROTECTED(obj)) {
return;
}
else {
rb_objspace_t *objspace = &rb_objspace;
gc_report(2, objspace, "rb_gc_writebarrier_unprotect: %s %s\n", obj_info(obj),
rgengc_remembered(objspace, obj) ? " (already remembered)" : "");
if (RVALUE_OLD_P(obj)) {
gc_report(1, objspace, "rb_gc_writebarrier_unprotect: %s\n", obj_info(obj));
RVALUE_DEMOTE(objspace, obj);
gc_mark_set(objspace, obj);
gc_remember_unprotected(objspace, obj);
#if RGENGC_PROFILE
objspace->profile.total_shade_operation_count++;
#if RGENGC_PROFILE >= 2
objspace->profile.shade_operation_count_types[BUILTIN_TYPE(obj)]++;
#endif /* RGENGC_PROFILE >= 2 */
#endif /* RGENGC_PROFILE */
}
else {
RVALUE_AGE_RESET(obj);
}
RB_DEBUG_COUNTER_INC(obj_wb_unprotect);
MARK_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS(obj), obj);
}
}
/*
* remember `obj' if needed.
*/
MJIT_FUNC_EXPORTED void
rb_gc_writebarrier_remember(VALUE obj)
{
rb_objspace_t *objspace = &rb_objspace;
gc_report(1, objspace, "rb_gc_writebarrier_remember: %s\n", obj_info(obj));
if (is_incremental_marking(objspace)) {
if (RVALUE_BLACK_P(obj)) {
gc_grey(objspace, obj);
}
}
else {
if (RVALUE_OLD_P(obj)) {
rgengc_remember(objspace, obj);
}
}
}
static st_table *rgengc_unprotect_logging_table;
static int
rgengc_unprotect_logging_exit_func_i(st_data_t key, st_data_t val, st_data_t arg)
{
fprintf(stderr, "%s\t%d\n", (char *)key, (int)val);
return ST_CONTINUE;
}
static void
rgengc_unprotect_logging_exit_func(void)
{
st_foreach(rgengc_unprotect_logging_table, rgengc_unprotect_logging_exit_func_i, 0);
}
void
rb_gc_unprotect_logging(void *objptr, const char *filename, int line)
{
VALUE obj = (VALUE)objptr;
if (rgengc_unprotect_logging_table == 0) {
rgengc_unprotect_logging_table = st_init_strtable();
atexit(rgengc_unprotect_logging_exit_func);
}
if (RVALUE_WB_UNPROTECTED(obj) == 0) {
char buff[0x100];
st_data_t cnt = 1;
char *ptr = buff;
snprintf(ptr, 0x100 - 1, "%s|%s:%d", obj_info(obj), filename, line);
if (st_lookup(rgengc_unprotect_logging_table, (st_data_t)ptr, &cnt)) {
cnt++;
}
else {
ptr = (strdup)(buff);
if (!ptr) rb_memerror();
}
st_insert(rgengc_unprotect_logging_table, (st_data_t)ptr, cnt);
}
}
#endif /* USE_RGENGC */
void
rb_copy_wb_protected_attribute(VALUE dest, VALUE obj)
{
#if USE_RGENGC
rb_objspace_t *objspace = &rb_objspace;
if (RVALUE_WB_UNPROTECTED(obj) && !RVALUE_WB_UNPROTECTED(dest)) {
if (!RVALUE_OLD_P(dest)) {
MARK_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS(dest), dest);
RVALUE_AGE_RESET_RAW(dest);
}
else {
RVALUE_DEMOTE(objspace, dest);
}
}
check_rvalue_consistency(dest);
#endif
}
/* RGENGC analysis information */
VALUE
rb_obj_rgengc_writebarrier_protected_p(VALUE obj)
{
#if USE_RGENGC
return RVALUE_WB_UNPROTECTED(obj) ? Qfalse : Qtrue;
#else
return Qfalse;
#endif
}
VALUE
rb_obj_rgengc_promoted_p(VALUE obj)
{
return OBJ_PROMOTED(obj) ? Qtrue : Qfalse;
}
size_t
rb_obj_gc_flags(VALUE obj, ID* flags, size_t max)
{
size_t n = 0;
static ID ID_marked;
#if USE_RGENGC
static ID ID_wb_protected, ID_old, ID_marking, ID_uncollectible, ID_pinned;
#endif
if (!ID_marked) {
#define I(s) ID_##s = rb_intern(#s);
I(marked);
#if USE_RGENGC
I(wb_protected);
I(old);
I(marking);
I(uncollectible);
I(pinned);
#endif
#undef I
}
#if USE_RGENGC
if (RVALUE_WB_UNPROTECTED(obj) == 0 && n<max) flags[n++] = ID_wb_protected;
if (RVALUE_OLD_P(obj) && n<max) flags[n++] = ID_old;
if (RVALUE_UNCOLLECTIBLE(obj) && n<max) flags[n++] = ID_uncollectible;
if (MARKED_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), obj) && n<max) flags[n++] = ID_marking;
#endif
if (MARKED_IN_BITMAP(GET_HEAP_MARK_BITS(obj), obj) && n<max) flags[n++] = ID_marked;
if (MARKED_IN_BITMAP(GET_HEAP_PINNED_BITS(obj), obj) && n<max) flags[n++] = ID_pinned;
return n;
}
/* GC */
void
rb_gc_force_recycle(VALUE obj)
{
rb_objspace_t *objspace = &rb_objspace;
#if USE_RGENGC
int is_old = RVALUE_OLD_P(obj);
gc_report(2, objspace, "rb_gc_force_recycle: %s\n", obj_info(obj));
if (is_old) {
if (RVALUE_MARKED(obj)) {
objspace->rgengc.old_objects--;
}
}
CLEAR_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS(obj), obj);
CLEAR_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS(obj), obj);
#if GC_ENABLE_INCREMENTAL_MARK
if (is_incremental_marking(objspace)) {
if (MARKED_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), obj)) {
invalidate_mark_stack(&objspace->mark_stack, obj);
CLEAR_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), obj);
}
CLEAR_IN_BITMAP(GET_HEAP_MARK_BITS(obj), obj);
}
else {
#endif
if (is_old || !GET_HEAP_PAGE(obj)->flags.before_sweep) {
CLEAR_IN_BITMAP(GET_HEAP_MARK_BITS(obj), obj);
}
CLEAR_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), obj);
#if GC_ENABLE_INCREMENTAL_MARK
}
#endif
#endif
objspace->profile.total_freed_objects++;
heap_page_add_freeobj(objspace, GET_HEAP_PAGE(obj), obj);
/* Disable counting swept_slots because there are no meaning.
* if (!MARKED_IN_BITMAP(GET_HEAP_MARK_BITS(p), p)) {
* objspace->heap.swept_slots++;
* }
*/
}
#ifndef MARK_OBJECT_ARY_BUCKET_SIZE
#define MARK_OBJECT_ARY_BUCKET_SIZE 1024
#endif
void
rb_gc_register_mark_object(VALUE obj)
{
VALUE ary_ary = GET_VM()->mark_object_ary;
VALUE ary = rb_ary_last(0, 0, ary_ary);
if (ary == Qnil || RARRAY_LEN(ary) >= MARK_OBJECT_ARY_BUCKET_SIZE) {
ary = rb_ary_tmp_new(MARK_OBJECT_ARY_BUCKET_SIZE);
rb_ary_push(ary_ary, ary);
}
rb_ary_push(ary, obj);
}
void
rb_gc_register_address(VALUE *addr)
{
rb_objspace_t *objspace = &rb_objspace;
struct gc_list *tmp;
tmp = ALLOC(struct gc_list);
tmp->next = global_list;
tmp->varptr = addr;
global_list = tmp;
}
void
rb_gc_unregister_address(VALUE *addr)
{
rb_objspace_t *objspace = &rb_objspace;
struct gc_list *tmp = global_list;
if (tmp->varptr == addr) {
global_list = tmp->next;
xfree(tmp);
return;
}
while (tmp->next) {
if (tmp->next->varptr == addr) {
struct gc_list *t = tmp->next;
tmp->next = tmp->next->next;
xfree(t);
break;
}
tmp = tmp->next;
}
}
void
rb_global_variable(VALUE *var)
{
rb_gc_register_address(var);
}
#define GC_NOTIFY 0
enum {
gc_stress_no_major,
gc_stress_no_immediate_sweep,
gc_stress_full_mark_after_malloc,
gc_stress_max
};
#define gc_stress_full_mark_after_malloc_p() \
(FIXNUM_P(ruby_gc_stress_mode) && (FIX2LONG(ruby_gc_stress_mode) & (1<<gc_stress_full_mark_after_malloc)))
static void
heap_ready_to_gc(rb_objspace_t *objspace, rb_heap_t *heap)
{
if (!heap->freelist && !heap->free_pages) {
if (!heap_increment(objspace, heap)) {
heap_set_increment(objspace, 1);
heap_increment(objspace, heap);
}
}
}
static int
ready_to_gc(rb_objspace_t *objspace)
{
if (dont_gc || during_gc || ruby_disable_gc) {
heap_ready_to_gc(objspace, heap_eden);
return FALSE;
}
else {
return TRUE;
}
}
static void
gc_reset_malloc_info(rb_objspace_t *objspace)
{
gc_prof_set_malloc_info(objspace);
{
size_t inc = ATOMIC_SIZE_EXCHANGE(malloc_increase, 0);
size_t old_limit = malloc_limit;
if (inc > malloc_limit) {
malloc_limit = (size_t)(inc * gc_params.malloc_limit_growth_factor);
if (malloc_limit > gc_params.malloc_limit_max) {
malloc_limit = gc_params.malloc_limit_max;
}
}
else {
malloc_limit = (size_t)(malloc_limit * 0.98); /* magic number */
if (malloc_limit < gc_params.malloc_limit_min) {
malloc_limit = gc_params.malloc_limit_min;
}
}
if (0) {
if (old_limit != malloc_limit) {
fprintf(stderr, "[%"PRIuSIZE"] malloc_limit: %"PRIuSIZE" -> %"PRIuSIZE"\n",
rb_gc_count(), old_limit, malloc_limit);
}
else {
fprintf(stderr, "[%"PRIuSIZE"] malloc_limit: not changed (%"PRIuSIZE")\n",
rb_gc_count(), malloc_limit);
}
}
}
/* reset oldmalloc info */
#if RGENGC_ESTIMATE_OLDMALLOC
if (!is_full_marking(objspace)) {
if (objspace->rgengc.oldmalloc_increase > objspace->rgengc.oldmalloc_increase_limit) {
objspace->rgengc.need_major_gc |= GPR_FLAG_MAJOR_BY_OLDMALLOC;
objspace->rgengc.oldmalloc_increase_limit =
(size_t)(objspace->rgengc.oldmalloc_increase_limit * gc_params.oldmalloc_limit_growth_factor);
if (objspace->rgengc.oldmalloc_increase_limit > gc_params.oldmalloc_limit_max) {
objspace->rgengc.oldmalloc_increase_limit = gc_params.oldmalloc_limit_max;
}
}
if (0) fprintf(stderr, "%d\t%d\t%u\t%u\t%d\n",
(int)rb_gc_count(),
(int)objspace->rgengc.need_major_gc,
(unsigned int)objspace->rgengc.oldmalloc_increase,
(unsigned int)objspace->rgengc.oldmalloc_increase_limit,
(unsigned int)gc_params.oldmalloc_limit_max);
}
else {
/* major GC */
objspace->rgengc.oldmalloc_increase = 0;
if ((objspace->profile.latest_gc_info & GPR_FLAG_MAJOR_BY_OLDMALLOC) == 0) {
objspace->rgengc.oldmalloc_increase_limit =
(size_t)(objspace->rgengc.oldmalloc_increase_limit / ((gc_params.oldmalloc_limit_growth_factor - 1)/10 + 1));
if (objspace->rgengc.oldmalloc_increase_limit < gc_params.oldmalloc_limit_min) {
objspace->rgengc.oldmalloc_increase_limit = gc_params.oldmalloc_limit_min;
}
}
}
#endif
}
static int
garbage_collect(rb_objspace_t *objspace, int reason)
{
#if GC_PROFILE_MORE_DETAIL
objspace->profile.prepare_time = getrusage_time();
#endif
gc_rest(objspace);
#if GC_PROFILE_MORE_DETAIL
objspace->profile.prepare_time = getrusage_time() - objspace->profile.prepare_time;
#endif
return gc_start(objspace, reason);
}
static int
gc_start(rb_objspace_t *objspace, int reason)
{
unsigned int do_full_mark = !!((unsigned)reason & GPR_FLAG_FULL_MARK);
unsigned int immediate_mark = (unsigned)reason & GPR_FLAG_IMMEDIATE_MARK;
/* reason may be clobbered, later, so keep set immediate_sweep here */
objspace->flags.immediate_sweep = !!((unsigned)reason & GPR_FLAG_IMMEDIATE_SWEEP);
if (!heap_allocated_pages) return FALSE; /* heap is not ready */
if (!(reason & GPR_FLAG_METHOD) && !ready_to_gc(objspace)) return TRUE; /* GC is not allowed */
GC_ASSERT(gc_mode(objspace) == gc_mode_none);
GC_ASSERT(!is_lazy_sweeping(heap_eden));
GC_ASSERT(!is_incremental_marking(objspace));
#if RGENGC_CHECK_MODE >= 2
gc_verify_internal_consistency(objspace);
#endif
gc_enter(objspace, "gc_start");
if (ruby_gc_stressful) {
int flag = FIXNUM_P(ruby_gc_stress_mode) ? FIX2INT(ruby_gc_stress_mode) : 0;
if ((flag & (1<<gc_stress_no_major)) == 0) {
do_full_mark = TRUE;
}
objspace->flags.immediate_sweep = !(flag & (1<<gc_stress_no_immediate_sweep));
}
else {
#if USE_RGENGC
if (objspace->rgengc.need_major_gc) {
reason |= objspace->rgengc.need_major_gc;
do_full_mark = TRUE;
}
else if (RGENGC_FORCE_MAJOR_GC) {
reason = GPR_FLAG_MAJOR_BY_FORCE;
do_full_mark = TRUE;
}
objspace->rgengc.need_major_gc = GPR_FLAG_NONE;
#endif
}
if (do_full_mark && (reason & GPR_FLAG_MAJOR_MASK) == 0) {
reason |= GPR_FLAG_MAJOR_BY_FORCE; /* GC by CAPI, METHOD, and so on. */
}
#if GC_ENABLE_INCREMENTAL_MARK
if (!GC_ENABLE_INCREMENTAL_MARK || objspace->flags.dont_incremental || immediate_mark) {
objspace->flags.during_incremental_marking = FALSE;
}
else {
objspace->flags.during_incremental_marking = do_full_mark;
}
#endif
if (!GC_ENABLE_LAZY_SWEEP || objspace->flags.dont_incremental) {
objspace->flags.immediate_sweep = TRUE;
}
if (objspace->flags.immediate_sweep) reason |= GPR_FLAG_IMMEDIATE_SWEEP;
gc_report(1, objspace, "gc_start(reason: %d) => %u, %d, %d\n",
reason,
do_full_mark, !is_incremental_marking(objspace), objspace->flags.immediate_sweep);
#if USE_DEBUG_COUNTER
RB_DEBUG_COUNTER_INC(gc_count);
if (reason & GPR_FLAG_MAJOR_MASK) {
(void)RB_DEBUG_COUNTER_INC_IF(gc_major_nofree, reason & GPR_FLAG_MAJOR_BY_NOFREE);
(void)RB_DEBUG_COUNTER_INC_IF(gc_major_oldgen, reason & GPR_FLAG_MAJOR_BY_OLDGEN);
(void)RB_DEBUG_COUNTER_INC_IF(gc_major_shady, reason & GPR_FLAG_MAJOR_BY_SHADY);
(void)RB_DEBUG_COUNTER_INC_IF(gc_major_force, reason & GPR_FLAG_MAJOR_BY_FORCE);
#if RGENGC_ESTIMATE_OLDMALLOC
(void)RB_DEBUG_COUNTER_INC_IF(gc_major_oldmalloc, reason & GPR_FLAG_MAJOR_BY_OLDMALLOC);
#endif
}
else {
(void)RB_DEBUG_COUNTER_INC_IF(gc_minor_newobj, reason & GPR_FLAG_NEWOBJ);
(void)RB_DEBUG_COUNTER_INC_IF(gc_minor_malloc, reason & GPR_FLAG_MALLOC);
(void)RB_DEBUG_COUNTER_INC_IF(gc_minor_method, reason & GPR_FLAG_METHOD);
(void)RB_DEBUG_COUNTER_INC_IF(gc_minor_capi, reason & GPR_FLAG_CAPI);
(void)RB_DEBUG_COUNTER_INC_IF(gc_minor_stress, reason & GPR_FLAG_STRESS);
}
#endif
objspace->profile.count++;
objspace->profile.latest_gc_info = reason;
objspace->profile.total_allocated_objects_at_gc_start = objspace->total_allocated_objects;
objspace->profile.heap_used_at_gc_start = heap_allocated_pages;
gc_prof_setup_new_record(objspace, reason);
gc_reset_malloc_info(objspace);
rb_transient_heap_start_marking(do_full_mark);
gc_event_hook(objspace, RUBY_INTERNAL_EVENT_GC_START, 0 /* TODO: pass minor/immediate flag? */);
GC_ASSERT(during_gc);
gc_prof_timer_start(objspace);
{
gc_marks(objspace, do_full_mark);
}
gc_prof_timer_stop(objspace);
gc_exit(objspace, "gc_start");
return TRUE;
}
static void
gc_rest(rb_objspace_t *objspace)
{
int marking = is_incremental_marking(objspace);
int sweeping = is_lazy_sweeping(heap_eden);
if (marking || sweeping) {
gc_enter(objspace, "gc_rest");
if (RGENGC_CHECK_MODE >= 2) gc_verify_internal_consistency(objspace);
if (is_incremental_marking(objspace)) {
PUSH_MARK_FUNC_DATA(NULL);
gc_marks_rest(objspace);
POP_MARK_FUNC_DATA();
}
if (is_lazy_sweeping(heap_eden)) {
gc_sweep_rest(objspace);
}
gc_exit(objspace, "gc_rest");
}
}
struct objspace_and_reason {
rb_objspace_t *objspace;
int reason;
};
static void
gc_current_status_fill(rb_objspace_t *objspace, char *buff)
{
int i = 0;
if (is_marking(objspace)) {
buff[i++] = 'M';
#if USE_RGENGC
if (is_full_marking(objspace)) buff[i++] = 'F';
#if GC_ENABLE_INCREMENTAL_MARK
if (is_incremental_marking(objspace)) buff[i++] = 'I';
#endif
#endif
}
else if (is_sweeping(objspace)) {
buff[i++] = 'S';
if (is_lazy_sweeping(heap_eden)) buff[i++] = 'L';
}
else {
buff[i++] = 'N';
}
buff[i] = '\0';
}
static const char *
gc_current_status(rb_objspace_t *objspace)
{
static char buff[0x10];
gc_current_status_fill(objspace, buff);
return buff;
}
#if PRINT_ENTER_EXIT_TICK
static tick_t last_exit_tick;
static tick_t enter_tick;
static int enter_count = 0;
static char last_gc_status[0x10];
static inline void
gc_record(rb_objspace_t *objspace, int direction, const char *event)
{
if (direction == 0) { /* enter */
enter_count++;
enter_tick = tick();
gc_current_status_fill(objspace, last_gc_status);
}
else { /* exit */
tick_t exit_tick = tick();
char current_gc_status[0x10];
gc_current_status_fill(objspace, current_gc_status);
#if 1
/* [last mutator time] [gc time] [event] */
fprintf(stderr, "%"PRItick"\t%"PRItick"\t%s\t[%s->%s|%c]\n",
enter_tick - last_exit_tick,
exit_tick - enter_tick,
event,
last_gc_status, current_gc_status,
(objspace->profile.latest_gc_info & GPR_FLAG_MAJOR_MASK) ? '+' : '-');
last_exit_tick = exit_tick;
#else
/* [enter_tick] [gc time] [event] */
fprintf(stderr, "%"PRItick"\t%"PRItick"\t%s\t[%s->%s|%c]\n",
enter_tick,
exit_tick - enter_tick,
event,
last_gc_status, current_gc_status,
(objspace->profile.latest_gc_info & GPR_FLAG_MAJOR_MASK) ? '+' : '-');
#endif
}
}
#else /* PRINT_ENTER_EXIT_TICK */
static inline void
gc_record(rb_objspace_t *objspace, int direction, const char *event)
{
/* null */
}
#endif /* PRINT_ENTER_EXIT_TICK */
static inline void
gc_enter(rb_objspace_t *objspace, const char *event)
{
GC_ASSERT(during_gc == 0);
if (RGENGC_CHECK_MODE >= 3) gc_verify_internal_consistency(objspace);
mjit_gc_start_hook();
during_gc = TRUE;
gc_report(1, objspace, "gc_enter: %s [%s]\n", event, gc_current_status(objspace));
gc_record(objspace, 0, event);
gc_event_hook(objspace, RUBY_INTERNAL_EVENT_GC_ENTER, 0); /* TODO: which parameter should be passed? */
}
static inline void
gc_exit(rb_objspace_t *objspace, const char *event)
{
GC_ASSERT(during_gc != 0);
gc_event_hook(objspace, RUBY_INTERNAL_EVENT_GC_EXIT, 0); /* TODO: which parameter should be passsed? */
gc_record(objspace, 1, event);
gc_report(1, objspace, "gc_exit: %s [%s]\n", event, gc_current_status(objspace));
during_gc = FALSE;
mjit_gc_exit_hook();
}
static void *
gc_with_gvl(void *ptr)
{
struct objspace_and_reason *oar = (struct objspace_and_reason *)ptr;
return (void *)(VALUE)garbage_collect(oar->objspace, oar->reason);
}
static int
garbage_collect_with_gvl(rb_objspace_t *objspace, int reason)
{
if (dont_gc) return TRUE;
if (ruby_thread_has_gvl_p()) {
return garbage_collect(objspace, reason);
}
else {
if (ruby_native_thread_p()) {
struct objspace_and_reason oar;
oar.objspace = objspace;
oar.reason = reason;
return (int)(VALUE)rb_thread_call_with_gvl(gc_with_gvl, (void *)&oar);
}
else {
/* no ruby thread */
fprintf(stderr, "[FATAL] failed to allocate memory\n");
exit(EXIT_FAILURE);
}
}
}
static VALUE
gc_start_internal(rb_execution_context_t *ec, VALUE self, VALUE full_mark, VALUE immediate_mark, VALUE immediate_sweep)
{
rb_objspace_t *objspace = &rb_objspace;
int reason = GPR_FLAG_FULL_MARK |
GPR_FLAG_IMMEDIATE_MARK |
GPR_FLAG_IMMEDIATE_SWEEP |
GPR_FLAG_METHOD;
if (!RTEST(full_mark)) reason &= ~GPR_FLAG_FULL_MARK;
if (!RTEST(immediate_mark)) reason &= ~GPR_FLAG_IMMEDIATE_MARK;
if (!RTEST(immediate_sweep)) reason &= ~GPR_FLAG_IMMEDIATE_SWEEP;
garbage_collect(objspace, reason);
gc_finalize_deferred(objspace);
return Qnil;
}
static int
gc_is_moveable_obj(rb_objspace_t *objspace, VALUE obj)
{
if (SPECIAL_CONST_P(obj)) {
return FALSE;
}
switch (BUILTIN_TYPE(obj)) {
case T_NONE:
case T_NIL:
case T_MOVED:
case T_ZOMBIE:
return FALSE;
break;
case T_SYMBOL:
if (DYNAMIC_SYM_P(obj) && (RSYMBOL(obj)->id & ~ID_SCOPE_MASK)) {
return FALSE;
}
/* fall through */
case T_STRING:
case T_OBJECT:
case T_FLOAT:
case T_IMEMO:
case T_ARRAY:
case T_BIGNUM:
case T_ICLASS:
case T_MODULE:
case T_REGEXP:
case T_DATA:
case T_MATCH:
case T_STRUCT:
case T_HASH:
case T_FILE:
case T_COMPLEX:
case T_RATIONAL:
case T_NODE:
case T_CLASS:
if (FL_TEST(obj, FL_FINALIZE)) {
if (st_is_member(finalizer_table, obj)) {
return FALSE;
}
}
return !RVALUE_PINNED(obj);
break;
default:
rb_bug("gc_is_moveable_obj: unreachable (%d)", (int)BUILTIN_TYPE(obj));
break;
}
return FALSE;
}
static VALUE
gc_move(rb_objspace_t *objspace, VALUE scan, VALUE free, VALUE moved_list)
{
int marked;
int wb_unprotected;
int uncollectible;
int marking;
RVALUE *dest = (RVALUE *)free;
RVALUE *src = (RVALUE *)scan;
gc_report(4, objspace, "Moving object: %p -> %p\n", (void*)scan, (void *)free);
GC_ASSERT(BUILTIN_TYPE(scan) != T_NONE);
GC_ASSERT(BUILTIN_TYPE(free) == T_NONE);
/* Save off bits for current object. */
marked = rb_objspace_marked_object_p((VALUE)src);
wb_unprotected = RVALUE_WB_UNPROTECTED((VALUE)src);
uncollectible = RVALUE_UNCOLLECTIBLE((VALUE)src);
marking = RVALUE_MARKING((VALUE)src);
objspace->total_allocated_objects++;
/* Clear bits for eventual T_MOVED */
CLEAR_IN_BITMAP(GET_HEAP_MARK_BITS((VALUE)src), (VALUE)src);
CLEAR_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS((VALUE)src), (VALUE)src);
CLEAR_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS((VALUE)src), (VALUE)src);
CLEAR_IN_BITMAP(GET_HEAP_MARKING_BITS((VALUE)src), (VALUE)src);
if (FL_TEST(src, FL_EXIVAR)) {
rb_mv_generic_ivar((VALUE)src, (VALUE)dest);
}
VALUE id;
/* If the source object's object_id has been seen, we need to update
* the object to object id mapping. */
if (st_lookup(objspace->obj_to_id_tbl, (VALUE)src, &id)) {
gc_report(4, objspace, "Moving object with seen id: %p -> %p\n", (void *)src, (void *)dest);
st_delete(objspace->obj_to_id_tbl, (st_data_t *)&src, 0);
st_insert(objspace->obj_to_id_tbl, (VALUE)dest, id);
}
/* Move the object */
memcpy(dest, src, sizeof(RVALUE));
memset(src, 0, sizeof(RVALUE));
/* Set bits for object in new location */
if (marking) {
MARK_IN_BITMAP(GET_HEAP_MARKING_BITS((VALUE)dest), (VALUE)dest);
}
else {
CLEAR_IN_BITMAP(GET_HEAP_MARKING_BITS((VALUE)dest), (VALUE)dest);
}
if (marked) {
MARK_IN_BITMAP(GET_HEAP_MARK_BITS((VALUE)dest), (VALUE)dest);
}
else {
CLEAR_IN_BITMAP(GET_HEAP_MARK_BITS((VALUE)dest), (VALUE)dest);
}
if (wb_unprotected) {
MARK_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS((VALUE)dest), (VALUE)dest);
}
else {
CLEAR_IN_BITMAP(GET_HEAP_WB_UNPROTECTED_BITS((VALUE)dest), (VALUE)dest);
}
if (uncollectible) {
MARK_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS((VALUE)dest), (VALUE)dest);
}
else {
CLEAR_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS((VALUE)dest), (VALUE)dest);
}
/* Assign forwarding address */
src->as.moved.flags = T_MOVED;
src->as.moved.destination = (VALUE)dest;
src->as.moved.next = moved_list;
GC_ASSERT(BUILTIN_TYPE((VALUE)dest) != T_NONE);
return (VALUE)src;
}
struct heap_cursor {
RVALUE *slot;
size_t index;
struct heap_page *page;
rb_objspace_t * objspace;
};
static void
advance_cursor(struct heap_cursor *free, struct heap_page **page_list)
{
if (free->slot == free->page->start + free->page->total_slots - 1) {
free->index++;
free->page = page_list[free->index];
free->slot = free->page->start;
}
else {
free->slot++;
}
}
static void
retreat_cursor(struct heap_cursor *scan, struct heap_page **page_list)
{
if (scan->slot == scan->page->start) {
scan->index--;
scan->page = page_list[scan->index];
scan->slot = scan->page->start + scan->page->total_slots - 1;
}
else {
scan->slot--;
}
}
static int
not_met(struct heap_cursor *free, struct heap_cursor *scan)
{
if (free->index < scan->index)
return 1;
if (free->index > scan->index)
return 0;
return free->slot < scan->slot;
}
static void
init_cursors(rb_objspace_t *objspace, struct heap_cursor *free, struct heap_cursor *scan, struct heap_page **page_list)
{
struct heap_page *page;
size_t total_pages = heap_eden->total_pages;
page = page_list[0];
free->index = 0;
free->page = page;
free->slot = page->start;
free->objspace = objspace;
page = page_list[total_pages - 1];
scan->index = total_pages - 1;
scan->page = page;
scan->slot = page->start + page->total_slots - 1;
scan->objspace = objspace;
}
static int
count_pinned(struct heap_page *page)
{
RVALUE *pstart = page->start;
RVALUE *pend = pstart + page->total_slots;
int pinned = 0;
VALUE v = (VALUE)pstart;
for (; v != (VALUE)pend; v += sizeof(RVALUE)) {
void *poisoned = asan_poisoned_object_p(v);
asan_unpoison_object(v, false);
switch (BUILTIN_TYPE(v)) {
case T_NONE:
break;
case T_ZOMBIE:
pinned++;
break;
default:
if (RVALUE_PINNED(v)) {
pinned++;
}
break;
}
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE(v) == T_NONE);
asan_poison_object(v);
}
}
return pinned;
}
static int
compare_pinned(const void *left, const void *right, void *dummy)
{
int left_count = count_pinned(*(struct heap_page * const *)left);
int right_count = count_pinned(*(struct heap_page * const *)right);
return right_count - left_count;
}
static int
compare_free_slots(const void *left, const void *right, void *dummy)
{
struct heap_page *left_page;
struct heap_page *right_page;
left_page = *(struct heap_page * const *)left;
right_page = *(struct heap_page * const *)right;
return right_page->free_slots - left_page->free_slots;
}
typedef int page_compare_func_t(const void *, const void *, void *);
static struct heap_page **
allocate_page_list(rb_objspace_t *objspace, page_compare_func_t *comparator)
{
size_t total_pages = heap_eden->total_pages;
size_t size = size_mul_or_raise(total_pages, sizeof(struct heap_page *), rb_eRuntimeError);
struct heap_page *page = 0, **page_list = malloc(size);
int i = 0;
list_for_each(&heap_eden->pages, page, page_node) {
page_list[i++] = page;
GC_ASSERT(page != NULL);
}
GC_ASSERT(total_pages > 0);
GC_ASSERT((size_t)i == total_pages);
ruby_qsort(page_list, total_pages, sizeof(struct heap_page *), comparator, NULL);
return page_list;
}
static VALUE
gc_compact_heap(rb_objspace_t *objspace, page_compare_func_t *comparator)
{
struct heap_cursor free_cursor;
struct heap_cursor scan_cursor;
struct heap_page **page_list;
VALUE moved_list;
moved_list = Qfalse;
memset(objspace->rcompactor.considered_count_table, 0, T_MASK * sizeof(size_t));
memset(objspace->rcompactor.moved_count_table, 0, T_MASK * sizeof(size_t));
page_list = allocate_page_list(objspace, comparator);
init_cursors(objspace, &free_cursor, &scan_cursor, page_list);
/* Two finger algorithm */
while (not_met(&free_cursor, &scan_cursor)) {
/* Free cursor movement */
/* Unpoison free_cursor slot */
void *free_slot_poison = asan_poisoned_object_p((VALUE)free_cursor.slot);
asan_unpoison_object((VALUE)free_cursor.slot, false);
while (BUILTIN_TYPE(free_cursor.slot) != T_NONE && not_met(&free_cursor, &scan_cursor)) {
/* Re-poison slot if it's not the one we want */
if (free_slot_poison) {
GC_ASSERT(BUILTIN_TYPE(free_cursor.slot) == T_NONE);
asan_poison_object((VALUE)free_cursor.slot);
}
advance_cursor(&free_cursor, page_list);
/* Unpoison free_cursor slot */
free_slot_poison = asan_poisoned_object_p((VALUE)free_cursor.slot);
asan_unpoison_object((VALUE)free_cursor.slot, false);
}
/* Unpoison scan_cursor slot */
void *scan_slot_poison = asan_poisoned_object_p((VALUE)scan_cursor.slot);
asan_unpoison_object((VALUE)scan_cursor.slot, false);
/* Scan cursor movement */
objspace->rcompactor.considered_count_table[BUILTIN_TYPE((VALUE)scan_cursor.slot)]++;
while (!gc_is_moveable_obj(objspace, (VALUE)scan_cursor.slot) && not_met(&free_cursor, &scan_cursor)) {
/* Re-poison slot if it's not the one we want */
if (scan_slot_poison) {
GC_ASSERT(BUILTIN_TYPE(scan_cursor.slot) == T_NONE);
asan_poison_object((VALUE)scan_cursor.slot);
}
retreat_cursor(&scan_cursor, page_list);
/* Unpoison scan_cursor slot */
scan_slot_poison = asan_poisoned_object_p((VALUE)scan_cursor.slot);
asan_unpoison_object((VALUE)scan_cursor.slot, false);
objspace->rcompactor.considered_count_table[BUILTIN_TYPE((VALUE)scan_cursor.slot)]++;
}
if (not_met(&free_cursor, &scan_cursor)) {
objspace->rcompactor.moved_count_table[BUILTIN_TYPE((VALUE)scan_cursor.slot)]++;
GC_ASSERT(BUILTIN_TYPE(free_cursor.slot) == T_NONE);
GC_ASSERT(BUILTIN_TYPE(scan_cursor.slot) != T_NONE);
GC_ASSERT(BUILTIN_TYPE(scan_cursor.slot) != T_MOVED);
moved_list = gc_move(objspace, (VALUE)scan_cursor.slot, (VALUE)free_cursor.slot, moved_list);
GC_ASSERT(BUILTIN_TYPE(free_cursor.slot) != T_MOVED);
GC_ASSERT(BUILTIN_TYPE(free_cursor.slot) != T_NONE);
GC_ASSERT(BUILTIN_TYPE(scan_cursor.slot) == T_MOVED);
advance_cursor(&free_cursor, page_list);
retreat_cursor(&scan_cursor, page_list);
}
}
free(page_list);
return moved_list;
}
static void
gc_ref_update_array(rb_objspace_t * objspace, VALUE v)
{
long i, len;
if (FL_TEST(v, ELTS_SHARED))
return;
len = RARRAY_LEN(v);
if (len > 0) {
VALUE *ptr = (VALUE *)RARRAY_CONST_PTR_TRANSIENT(v);
for (i = 0; i < len; i++) {
UPDATE_IF_MOVED(objspace, ptr[i]);
}
}
}
static void
gc_ref_update_object(rb_objspace_t * objspace, VALUE v)
{
VALUE *ptr = ROBJECT_IVPTR(v);
if (ptr) {
uint32_t i, len = ROBJECT_NUMIV(v);
for (i = 0; i < len; i++) {
UPDATE_IF_MOVED(objspace, ptr[i]);
}
}
}
static int
hash_replace_ref(st_data_t *key, st_data_t *value, st_data_t argp, int existing)
{
rb_objspace_t *objspace = (rb_objspace_t *)argp;
if (gc_object_moved_p(objspace, (VALUE)*key)) {
*key = rb_gc_location((VALUE)*key);
}
if (gc_object_moved_p(objspace, (VALUE)*value)) {
*value = rb_gc_location((VALUE)*value);
}
return ST_CONTINUE;
}
static int
hash_foreach_replace(st_data_t key, st_data_t value, st_data_t argp, int error)
{
rb_objspace_t *objspace;
objspace = (rb_objspace_t *)argp;
if (gc_object_moved_p(objspace, (VALUE)key)) {
return ST_REPLACE;
}
if (gc_object_moved_p(objspace, (VALUE)value)) {
return ST_REPLACE;
}
return ST_CONTINUE;
}
static int
hash_replace_ref_value(st_data_t *key, st_data_t *value, st_data_t argp, int existing)
{
rb_objspace_t *objspace = (rb_objspace_t *)argp;
if (gc_object_moved_p(objspace, (VALUE)*value)) {
*value = rb_gc_location((VALUE)*value);
}
return ST_CONTINUE;
}
static int
hash_foreach_replace_value(st_data_t key, st_data_t value, st_data_t argp, int error)
{
rb_objspace_t *objspace;
objspace = (rb_objspace_t *)argp;
if (gc_object_moved_p(objspace, (VALUE)value)) {
return ST_REPLACE;
}
return ST_CONTINUE;
}
static void
gc_update_tbl_refs(rb_objspace_t * objspace, st_table *tbl)
{
if (!tbl || tbl->num_entries == 0) return;
if (st_foreach_with_replace(tbl, hash_foreach_replace_value, hash_replace_ref_value, (st_data_t)objspace)) {
rb_raise(rb_eRuntimeError, "hash modified during iteration");
}
}
static void
gc_update_table_refs(rb_objspace_t * objspace, st_table *tbl)
{
if (!tbl || tbl->num_entries == 0) return;
if (st_foreach_with_replace(tbl, hash_foreach_replace, hash_replace_ref, (st_data_t)objspace)) {
rb_raise(rb_eRuntimeError, "hash modified during iteration");
}
}
/* Update MOVED references in an st_table */
void
rb_gc_update_tbl_refs(st_table *ptr)
{
rb_objspace_t *objspace = &rb_objspace;
gc_update_table_refs(objspace, ptr);
}
static void
gc_ref_update_hash(rb_objspace_t * objspace, VALUE v)
{
rb_hash_stlike_foreach_with_replace(v, hash_foreach_replace, hash_replace_ref, (st_data_t)objspace);
}
static void
gc_ref_update_method_entry(rb_objspace_t *objspace, rb_method_entry_t *me)
{
rb_method_definition_t *def = me->def;
UPDATE_IF_MOVED(objspace, me->owner);
UPDATE_IF_MOVED(objspace, me->defined_class);
if (def) {
switch (def->type) {
case VM_METHOD_TYPE_ISEQ:
if (def->body.iseq.iseqptr) {
TYPED_UPDATE_IF_MOVED(objspace, rb_iseq_t *, def->body.iseq.iseqptr);
}
TYPED_UPDATE_IF_MOVED(objspace, rb_cref_t *, def->body.iseq.cref);
break;
case VM_METHOD_TYPE_ATTRSET:
case VM_METHOD_TYPE_IVAR:
UPDATE_IF_MOVED(objspace, def->body.attr.location);
break;
case VM_METHOD_TYPE_BMETHOD:
UPDATE_IF_MOVED(objspace, def->body.bmethod.proc);
break;
case VM_METHOD_TYPE_ALIAS:
TYPED_UPDATE_IF_MOVED(objspace, struct rb_method_entry_struct *, def->body.alias.original_me);
return;
case VM_METHOD_TYPE_REFINED:
TYPED_UPDATE_IF_MOVED(objspace, struct rb_method_entry_struct *, def->body.refined.orig_me);
UPDATE_IF_MOVED(objspace, def->body.refined.owner);
break;
case VM_METHOD_TYPE_CFUNC:
case VM_METHOD_TYPE_ZSUPER:
case VM_METHOD_TYPE_MISSING:
case VM_METHOD_TYPE_OPTIMIZED:
case VM_METHOD_TYPE_UNDEF:
case VM_METHOD_TYPE_NOTIMPLEMENTED:
break;
}
}
}
static void
gc_update_values(rb_objspace_t *objspace, long n, VALUE *values)
{
long i;
for (i=0; i<n; i++) {
UPDATE_IF_MOVED(objspace, values[i]);
}
}
static void
gc_ref_update_imemo(rb_objspace_t *objspace, VALUE obj)
{
switch (imemo_type(obj)) {
case imemo_env:
{
rb_env_t *env = (rb_env_t *)obj;
TYPED_UPDATE_IF_MOVED(objspace, rb_iseq_t *, env->iseq);
UPDATE_IF_MOVED(objspace, env->ep[VM_ENV_DATA_INDEX_ENV]);
gc_update_values(objspace, (long)env->env_size, (VALUE *)env->env);
}
break;
case imemo_cref:
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.cref.klass);
TYPED_UPDATE_IF_MOVED(objspace, struct rb_cref_struct *, RANY(obj)->as.imemo.cref.next);
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.cref.refinements);
break;
case imemo_svar:
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.svar.cref_or_me);
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.svar.lastline);
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.svar.backref);
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.svar.others);
break;
case imemo_throw_data:
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.throw_data.throw_obj);
break;
case imemo_ifunc:
break;
case imemo_memo:
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.memo.v1);
UPDATE_IF_MOVED(objspace, RANY(obj)->as.imemo.memo.v2);
break;
case imemo_ment:
gc_ref_update_method_entry(objspace, &RANY(obj)->as.imemo.ment);
break;
case imemo_iseq:
rb_iseq_update_references((rb_iseq_t *)obj);
break;
case imemo_ast:
rb_ast_update_references((rb_ast_t *)obj);
break;
case imemo_parser_strterm:
case imemo_tmpbuf:
break;
default:
rb_bug("not reachable %d", imemo_type(obj));
break;
}
}
static enum rb_id_table_iterator_result
check_id_table_move(ID id, VALUE value, void *data)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
if (gc_object_moved_p(objspace, (VALUE)value)) {
return ID_TABLE_REPLACE;
}
return ID_TABLE_CONTINUE;
}
/* Returns the new location of an object, if it moved. Otherwise returns
* the existing location. */
VALUE
rb_gc_location(VALUE value)
{
VALUE destination;
if (!SPECIAL_CONST_P((void *)value)) {
void *poisoned = asan_poisoned_object_p(value);
asan_unpoison_object(value, false);
if (BUILTIN_TYPE(value) == T_MOVED) {
destination = (VALUE)RMOVED(value)->destination;
GC_ASSERT(BUILTIN_TYPE(destination) != T_NONE);
}
else {
destination = value;
}
/* Re-poison slot if it's not the one we want */
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE(value) == T_NONE);
asan_poison_object(value);
}
}
else {
destination = value;
}
return destination;
}
static enum rb_id_table_iterator_result
update_id_table(ID *key, VALUE * value, void *data, int existing)
{
rb_objspace_t *objspace = (rb_objspace_t *)data;
if (gc_object_moved_p(objspace, (VALUE)*value)) {
*value = rb_gc_location((VALUE)*value);
}
return ID_TABLE_CONTINUE;
}
static void
update_m_tbl(rb_objspace_t *objspace, struct rb_id_table *tbl)
{
if (tbl) {
rb_id_table_foreach_with_replace(tbl, check_id_table_move, update_id_table, objspace);
}
}
static enum rb_id_table_iterator_result
update_const_table(VALUE value, void *data)
{
rb_const_entry_t *ce = (rb_const_entry_t *)value;
rb_objspace_t * objspace = (rb_objspace_t *)data;
if (gc_object_moved_p(objspace, ce->value)) {
ce->value = rb_gc_location(ce->value);
}
if (gc_object_moved_p(objspace, ce->file)) {
ce->file = rb_gc_location(ce->file);
}
return ID_TABLE_CONTINUE;
}
static void
update_const_tbl(rb_objspace_t *objspace, struct rb_id_table *tbl)
{
if (!tbl) return;
rb_id_table_foreach_values(tbl, update_const_table, objspace);
}
static void
update_subclass_entries(rb_objspace_t *objspace, rb_subclass_entry_t *entry)
{
while (entry) {
UPDATE_IF_MOVED(objspace, entry->klass);
entry = entry->next;
}
}
static void
update_class_ext(rb_objspace_t *objspace, rb_classext_t *ext)
{
UPDATE_IF_MOVED(objspace, ext->origin_);
UPDATE_IF_MOVED(objspace, ext->refined_class);
update_subclass_entries(objspace, ext->subclasses);
}
static void
gc_update_object_references(rb_objspace_t *objspace, VALUE obj)
{
RVALUE *any = RANY(obj);
gc_report(4, objspace, "update-refs: %p ->", (void *)obj);
switch (BUILTIN_TYPE(obj)) {
case T_CLASS:
case T_MODULE:
update_m_tbl(objspace, RCLASS_M_TBL(obj));
if (RCLASS_SUPER((VALUE)obj)) {
UPDATE_IF_MOVED(objspace, RCLASS(obj)->super);
}
if (!RCLASS_EXT(obj)) break;
if (RCLASS_IV_TBL(obj)) {
gc_update_tbl_refs(objspace, RCLASS_IV_TBL(obj));
}
update_class_ext(objspace, RCLASS_EXT(obj));
update_const_tbl(objspace, RCLASS_CONST_TBL(obj));
break;
case T_ICLASS:
if (FL_TEST(obj, RICLASS_IS_ORIGIN)) {
update_m_tbl(objspace, RCLASS_M_TBL(obj));
}
if (RCLASS_SUPER((VALUE)obj)) {
UPDATE_IF_MOVED(objspace, RCLASS(obj)->super);
}
if (!RCLASS_EXT(obj)) break;
if (RCLASS_IV_TBL(obj)) {
gc_update_tbl_refs(objspace, RCLASS_IV_TBL(obj));
}
update_class_ext(objspace, RCLASS_EXT(obj));
update_m_tbl(objspace, RCLASS_CALLABLE_M_TBL(obj));
break;
case T_IMEMO:
gc_ref_update_imemo(objspace, obj);
return;
case T_NIL:
case T_FIXNUM:
case T_NODE:
case T_MOVED:
case T_NONE:
/* These can't move */
return;
case T_ARRAY:
if (FL_TEST(obj, ELTS_SHARED)) {
UPDATE_IF_MOVED(objspace, any->as.array.as.heap.aux.shared_root);
}
else {
gc_ref_update_array(objspace, obj);
}
break;
case T_HASH:
gc_ref_update_hash(objspace, obj);
UPDATE_IF_MOVED(objspace, any->as.hash.ifnone);
break;
case T_STRING:
if (STR_SHARED_P(obj)) {
UPDATE_IF_MOVED(objspace, any->as.string.as.heap.aux.shared);
}
break;
case T_DATA:
/* Call the compaction callback, if it exists */
{
void *const ptr = DATA_PTR(obj);
if (ptr) {
if (RTYPEDDATA_P(obj)) {
RUBY_DATA_FUNC compact_func = any->as.typeddata.type->function.dcompact;
if (compact_func) (*compact_func)(ptr);
}
}
}
break;
case T_OBJECT:
gc_ref_update_object(objspace, obj);
break;
case T_FILE:
if (any->as.file.fptr) {
UPDATE_IF_MOVED(objspace, any->as.file.fptr->pathv);
UPDATE_IF_MOVED(objspace, any->as.file.fptr->tied_io_for_writing);
UPDATE_IF_MOVED(objspace, any->as.file.fptr->writeconv_asciicompat);
UPDATE_IF_MOVED(objspace, any->as.file.fptr->writeconv_pre_ecopts);
UPDATE_IF_MOVED(objspace, any->as.file.fptr->encs.ecopts);
UPDATE_IF_MOVED(objspace, any->as.file.fptr->write_lock);
}
break;
case T_REGEXP:
UPDATE_IF_MOVED(objspace, any->as.regexp.src);
break;
case T_SYMBOL:
if (DYNAMIC_SYM_P((VALUE)any)) {
UPDATE_IF_MOVED(objspace, RSYMBOL(any)->fstr);
}
break;
case T_FLOAT:
case T_BIGNUM:
break;
case T_MATCH:
UPDATE_IF_MOVED(objspace, any->as.match.regexp);
if (any->as.match.str) {
UPDATE_IF_MOVED(objspace, any->as.match.str);
}
break;
case T_RATIONAL:
UPDATE_IF_MOVED(objspace, any->as.rational.num);
UPDATE_IF_MOVED(objspace, any->as.rational.den);
break;
case T_COMPLEX:
UPDATE_IF_MOVED(objspace, any->as.complex.real);
UPDATE_IF_MOVED(objspace, any->as.complex.imag);
break;
case T_STRUCT:
{
long i, len = RSTRUCT_LEN(obj);
VALUE *ptr = (VALUE *)RSTRUCT_CONST_PTR(obj);
for (i = 0; i < len; i++) {
UPDATE_IF_MOVED(objspace, ptr[i]);
}
}
break;
default:
#if GC_DEBUG
rb_gcdebug_print_obj_condition((VALUE)obj);
rb_obj_info_dump(obj);
rb_bug("unreachable");
#endif
break;
}
UPDATE_IF_MOVED(objspace, RBASIC(obj)->klass);
gc_report(4, objspace, "update-refs: %p <-", (void *)obj);
}
static int
gc_ref_update(void *vstart, void *vend, size_t stride, void * data)
{
rb_objspace_t * objspace;
struct heap_page *page;
short free_slots = 0;
VALUE v = (VALUE)vstart;
objspace = (rb_objspace_t *)data;
page = GET_HEAP_PAGE(v);
asan_unpoison_memory_region(&page->freelist, sizeof(RVALUE*), false);
page->freelist = NULL;
asan_poison_memory_region(&page->freelist, sizeof(RVALUE*));
page->flags.has_uncollectible_shady_objects = FALSE;
page->flags.has_remembered_objects = FALSE;
/* For each object on the page */
for (; v != (VALUE)vend; v += stride) {
if (!SPECIAL_CONST_P(v)) {
void *poisoned = asan_poisoned_object_p(v);
asan_unpoison_object(v, false);
switch (BUILTIN_TYPE(v)) {
case T_NONE:
heap_page_add_freeobj(objspace, page, v);
free_slots++;
break;
case T_MOVED:
break;
case T_ZOMBIE:
break;
default:
if (RVALUE_WB_UNPROTECTED(v)) {
page->flags.has_uncollectible_shady_objects = TRUE;
}
if (RVALUE_PAGE_MARKING(page, v)) {
page->flags.has_remembered_objects = TRUE;
}
gc_update_object_references(objspace, v);
}
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE(v) == T_NONE);
asan_poison_object(v);
}
}
}
page->free_slots = free_slots;
return 0;
}
extern rb_symbols_t ruby_global_symbols;
#define global_symbols ruby_global_symbols
static void
gc_update_references(rb_objspace_t * objspace)
{
rb_execution_context_t *ec = GET_EC();
rb_vm_t *vm = rb_ec_vm_ptr(ec);
objspace_each_objects_without_setup(objspace, gc_ref_update, objspace);
rb_vm_update_references(vm);
rb_transient_heap_update_references();
global_symbols.ids = rb_gc_location(global_symbols.ids);
global_symbols.dsymbol_fstr_hash = rb_gc_location(global_symbols.dsymbol_fstr_hash);
gc_update_tbl_refs(objspace, objspace->obj_to_id_tbl);
gc_update_table_refs(objspace, objspace->id_to_obj_tbl);
gc_update_table_refs(objspace, global_symbols.str_sym);
gc_update_table_refs(objspace, finalizer_table);
}
static VALUE type_sym(size_t type);
static VALUE
gc_compact_stats(rb_objspace_t *objspace)
{
size_t i;
VALUE h = rb_hash_new();
VALUE considered = rb_hash_new();
VALUE moved = rb_hash_new();
for (i=0; i<T_MASK; i++) {
rb_hash_aset(considered, type_sym(i), SIZET2NUM(objspace->rcompactor.considered_count_table[i]));
}
for (i=0; i<T_MASK; i++) {
rb_hash_aset(moved, type_sym(i), SIZET2NUM(objspace->rcompactor.moved_count_table[i]));
}
rb_hash_aset(h, ID2SYM(rb_intern("considered")), considered);
rb_hash_aset(h, ID2SYM(rb_intern("moved")), moved);
return h;
}
static void gc_compact_after_gc(rb_objspace_t *objspace, int use_toward_empty, int use_double_pages, int use_verifier);
static void
gc_compact(rb_objspace_t *objspace, int use_toward_empty, int use_double_pages, int use_verifier)
{
objspace->flags.during_compacting = TRUE;
{
/* pin objects referenced by maybe pointers */
garbage_collect(objspace, GPR_DEFAULT_REASON);
/* compact */
gc_compact_after_gc(objspace, use_toward_empty, use_double_pages, TRUE);
}
objspace->flags.during_compacting = FALSE;
}
static VALUE
rb_gc_compact(rb_execution_context_t *ec, VALUE self)
{
rb_objspace_t *objspace = &rb_objspace;
if (dont_gc) return Qnil;
gc_compact(objspace, FALSE, FALSE, FALSE);
return gc_compact_stats(objspace);
}
static void
root_obj_check_moved_i(const char *category, VALUE obj, void *data)
{
if (gc_object_moved_p(&rb_objspace, obj)) {
rb_bug("ROOT %s points to MOVED: %p -> %s\n", category, (void *)obj, obj_info(rb_gc_location(obj)));
}
}
static void
reachable_object_check_moved_i(VALUE ref, void *data)
{
VALUE parent = (VALUE)data;
if (gc_object_moved_p(&rb_objspace, ref)) {
rb_bug("Object %s points to MOVED: %p -> %s\n", obj_info(parent), (void *)ref, obj_info(rb_gc_location(ref)));
}
}
static int
heap_check_moved_i(void *vstart, void *vend, size_t stride, void *data)
{
VALUE v = (VALUE)vstart;
for (; v != (VALUE)vend; v += stride) {
if (gc_object_moved_p(&rb_objspace, v)) {
/* Moved object still on the heap, something may have a reference. */
}
else {
void *poisoned = asan_poisoned_object_p(v);
asan_unpoison_object(v, false);
switch (BUILTIN_TYPE(v)) {
case T_NONE:
case T_ZOMBIE:
break;
default:
rb_objspace_reachable_objects_from(v, reachable_object_check_moved_i, (void *)v);
}
if (poisoned) {
GC_ASSERT(BUILTIN_TYPE(v) == T_NONE);
asan_poison_object(v);
}
}
}
return 0;
}
static VALUE
gc_check_references_for_moved(rb_objspace_t *objspace)
{
objspace_reachable_objects_from_root(objspace, root_obj_check_moved_i, NULL);
objspace_each_objects(objspace, heap_check_moved_i, NULL);
return Qnil;
}
static void
gc_compact_after_gc(rb_objspace_t *objspace, int use_toward_empty, int use_double_pages, int use_verifier)
{
if (0) fprintf(stderr, "gc_compact_after_gc: %d,%d,%d\n", use_toward_empty, use_double_pages, use_verifier);
mjit_gc_start_hook(); // prevent MJIT from running while moving pointers related to ISeq
objspace->profile.compact_count++;
if (use_verifier) {
gc_verify_internal_consistency(objspace);
}
if (use_double_pages) {
/* Double heap size */
heap_add_pages(objspace, heap_eden, heap_allocated_pages);
}
VALUE moved_list_head;
VALUE disabled = rb_gc_disable();
if (use_toward_empty) {
moved_list_head = gc_compact_heap(objspace, compare_free_slots);
}
else {
moved_list_head = gc_compact_heap(objspace, compare_pinned);
}
heap_eden->freelist = NULL;
gc_update_references(objspace);
if (!RTEST(disabled)) rb_gc_enable();
if (use_verifier) {
gc_check_references_for_moved(objspace);
}
rb_clear_method_cache_by_class(rb_cObject);
rb_clear_constant_cache();
heap_eden->free_pages = NULL;
heap_eden->using_page = NULL;
/* For each moved slot */
while (moved_list_head) {
VALUE next_moved;
struct heap_page *page;
page = GET_HEAP_PAGE(moved_list_head);
next_moved = RMOVED(moved_list_head)->next;
/* clear the memory for that moved slot */
RMOVED(moved_list_head)->flags = 0;
RMOVED(moved_list_head)->destination = 0;
RMOVED(moved_list_head)->next = 0;
page->free_slots++;
heap_page_add_freeobj(objspace, page, moved_list_head);
if (page->free_slots == page->total_slots && heap_pages_freeable_pages > 0) {
heap_pages_freeable_pages--;
heap_unlink_page(objspace, heap_eden, page);
heap_add_page(objspace, heap_tomb, page);
}
objspace->profile.total_freed_objects++;
moved_list_head = next_moved;
}
/* Add any eden pages with free slots back to the free pages list */
struct heap_page *page = NULL;
list_for_each(&heap_eden->pages, page, page_node) {
if (page->free_slots > 0) {
heap_add_freepage(objspace, heap_eden, page);
} else {
page->free_next = NULL;
}
}
/* Set up "using_page" if we have any pages with free slots */
if (heap_eden->free_pages) {
heap_eden->using_page = heap_eden->free_pages;
heap_eden->free_pages = heap_eden->free_pages->free_next;
}
if (use_verifier) {
gc_verify_internal_consistency(objspace);
}
mjit_gc_exit_hook(); // unlock MJIT here, because `rb_gc()` calls `mjit_gc_start_hook()` again.
}
/*
* call-seq:
* GC.verify_compaction_references -> nil
*
* Verify compaction reference consistency.
*
* This method is implementation specific. During compaction, objects that
* were moved are replaced with T_MOVED objects. No object should have a
* reference to a T_MOVED object after compaction.
*
* This function doubles the heap to ensure room to move all objects,
* compacts the heap to make sure everything moves, updates all references,
* then performs a full GC. If any object contains a reference to a T_MOVED
* object, that object should be pushed on the mark stack, and will
* make a SEGV.
*/
static VALUE
gc_verify_compaction_references(int argc, VALUE *argv, VALUE mod)
{
rb_objspace_t *objspace = &rb_objspace;
int use_toward_empty = FALSE;
int use_double_pages = FALSE;
if (dont_gc) return Qnil;
VALUE opt = Qnil;
static ID keyword_ids[2];
VALUE kwvals[2];
kwvals[1] = Qtrue;
rb_scan_args(argc, argv, "0:", &opt);
if (!NIL_P(opt)) {
if (!keyword_ids[0]) {
keyword_ids[0] = rb_intern("toward");
keyword_ids[1] = rb_intern("double_heap");
}
rb_get_kwargs(opt, keyword_ids, 0, 2, kwvals);
if (rb_intern("empty") == rb_sym2id(kwvals[0])) {
use_toward_empty = TRUE;
}
if (kwvals[1] != Qundef && RTEST(kwvals[1])) {
use_double_pages = TRUE;
}
}
gc_compact(objspace, use_toward_empty, use_double_pages, TRUE);
return gc_compact_stats(objspace);
}
VALUE
rb_gc_start(void)
{
rb_gc();
return Qnil;
}
void
rb_gc(void)
{
rb_objspace_t *objspace = &rb_objspace;
int reason = GPR_DEFAULT_REASON;
garbage_collect(objspace, reason);
}
int
rb_during_gc(void)
{
rb_objspace_t *objspace = &rb_objspace;
return during_gc;
}
#if RGENGC_PROFILE >= 2
static const char *type_name(int type, VALUE obj);
static void
gc_count_add_each_types(VALUE hash, const char *name, const size_t *types)
{
VALUE result = rb_hash_new_with_size(T_MASK);
int i;
for (i=0; i<T_MASK; i++) {
const char *type = type_name(i, 0);
rb_hash_aset(result, ID2SYM(rb_intern(type)), SIZET2NUM(types[i]));
}
rb_hash_aset(hash, ID2SYM(rb_intern(name)), result);
}
#endif
size_t
rb_gc_count(void)
{
return rb_objspace.profile.count;
}
static VALUE
gc_count(rb_execution_context_t *ec, VALUE self)
{
return SIZET2NUM(rb_gc_count());
}
static VALUE
gc_info_decode(rb_objspace_t *objspace, const VALUE hash_or_key, const int orig_flags)
{
static VALUE sym_major_by = Qnil, sym_gc_by, sym_immediate_sweep, sym_have_finalizer, sym_state;
static VALUE sym_nofree, sym_oldgen, sym_shady, sym_force, sym_stress;
#if RGENGC_ESTIMATE_OLDMALLOC
static VALUE sym_oldmalloc;
#endif
static VALUE sym_newobj, sym_malloc, sym_method, sym_capi;
static VALUE sym_none, sym_marking, sym_sweeping;
VALUE hash = Qnil, key = Qnil;
VALUE major_by;
VALUE flags = orig_flags ? orig_flags : objspace->profile.latest_gc_info;
if (SYMBOL_P(hash_or_key)) {
key = hash_or_key;
}
else if (RB_TYPE_P(hash_or_key, T_HASH)) {
hash = hash_or_key;
}
else {
rb_raise(rb_eTypeError, "non-hash or symbol given");
}
if (sym_major_by == Qnil) {
#define S(s) sym_##s = ID2SYM(rb_intern_const(#s))
S(major_by);
S(gc_by);
S(immediate_sweep);
S(have_finalizer);
S(state);
S(stress);
S(nofree);
S(oldgen);
S(shady);
S(force);
#if RGENGC_ESTIMATE_OLDMALLOC
S(oldmalloc);
#endif
S(newobj);
S(malloc);
S(method);
S(capi);
S(none);
S(marking);
S(sweeping);
#undef S
}
#define SET(name, attr) \
if (key == sym_##name) \
return (attr); \
else if (hash != Qnil) \
rb_hash_aset(hash, sym_##name, (attr));
major_by =
(flags & GPR_FLAG_MAJOR_BY_NOFREE) ? sym_nofree :
(flags & GPR_FLAG_MAJOR_BY_OLDGEN) ? sym_oldgen :
(flags & GPR_FLAG_MAJOR_BY_SHADY) ? sym_shady :
(flags & GPR_FLAG_MAJOR_BY_FORCE) ? sym_force :
#if RGENGC_ESTIMATE_OLDMALLOC
(flags & GPR_FLAG_MAJOR_BY_OLDMALLOC) ? sym_oldmalloc :
#endif
Qnil;
SET(major_by, major_by);
SET(gc_by,
(flags & GPR_FLAG_NEWOBJ) ? sym_newobj :
(flags & GPR_FLAG_MALLOC) ? sym_malloc :
(flags & GPR_FLAG_METHOD) ? sym_method :
(flags & GPR_FLAG_CAPI) ? sym_capi :
(flags & GPR_FLAG_STRESS) ? sym_stress :
Qnil
);
SET(have_finalizer, (flags & GPR_FLAG_HAVE_FINALIZE) ? Qtrue : Qfalse);
SET(immediate_sweep, (flags & GPR_FLAG_IMMEDIATE_SWEEP) ? Qtrue : Qfalse);
if (orig_flags == 0) {
SET(state, gc_mode(objspace) == gc_mode_none ? sym_none :
gc_mode(objspace) == gc_mode_marking ? sym_marking : sym_sweeping);
}
#undef SET
if (!NIL_P(key)) {/* matched key should return above */
rb_raise(rb_eArgError, "unknown key: %"PRIsVALUE, rb_sym2str(key));
}
return hash;
}
VALUE
rb_gc_latest_gc_info(VALUE key)
{
rb_objspace_t *objspace = &rb_objspace;
return gc_info_decode(objspace, key, 0);
}
static VALUE
gc_latest_gc_info(rb_execution_context_t *ec, VALUE self, VALUE arg)
{
rb_objspace_t *objspace = &rb_objspace;
if (NIL_P(arg)) {
arg = rb_hash_new();
}
else if (!SYMBOL_P(arg) && !RB_TYPE_P(arg, T_HASH)) {
rb_raise(rb_eTypeError, "non-hash or symbol given");
}
return gc_info_decode(objspace, arg, 0);
}
enum gc_stat_sym {
gc_stat_sym_count,
gc_stat_sym_heap_allocated_pages,
gc_stat_sym_heap_sorted_length,
gc_stat_sym_heap_allocatable_pages,
gc_stat_sym_heap_available_slots,
gc_stat_sym_heap_live_slots,
gc_stat_sym_heap_free_slots,
gc_stat_sym_heap_final_slots,
gc_stat_sym_heap_marked_slots,
gc_stat_sym_heap_eden_pages,
gc_stat_sym_heap_tomb_pages,
gc_stat_sym_total_allocated_pages,
gc_stat_sym_total_freed_pages,
gc_stat_sym_total_allocated_objects,
gc_stat_sym_total_freed_objects,
gc_stat_sym_malloc_increase_bytes,
gc_stat_sym_malloc_increase_bytes_limit,
#if USE_RGENGC
gc_stat_sym_minor_gc_count,
gc_stat_sym_major_gc_count,
gc_stat_sym_compact_count,
gc_stat_sym_remembered_wb_unprotected_objects,
gc_stat_sym_remembered_wb_unprotected_objects_limit,
gc_stat_sym_old_objects,
gc_stat_sym_old_objects_limit,
#if RGENGC_ESTIMATE_OLDMALLOC
gc_stat_sym_oldmalloc_increase_bytes,
gc_stat_sym_oldmalloc_increase_bytes_limit,
#endif
#if RGENGC_PROFILE
gc_stat_sym_total_generated_normal_object_count,
gc_stat_sym_total_generated_shady_object_count,
gc_stat_sym_total_shade_operation_count,
gc_stat_sym_total_promoted_count,
gc_stat_sym_total_remembered_normal_object_count,
gc_stat_sym_total_remembered_shady_object_count,
#endif
#endif
gc_stat_sym_last
};
enum gc_stat_compat_sym {
gc_stat_compat_sym_gc_stat_heap_used,
gc_stat_compat_sym_heap_eden_page_length,
gc_stat_compat_sym_heap_tomb_page_length,
gc_stat_compat_sym_heap_increment,
gc_stat_compat_sym_heap_length,
gc_stat_compat_sym_heap_live_slot,
gc_stat_compat_sym_heap_free_slot,
gc_stat_compat_sym_heap_final_slot,
gc_stat_compat_sym_heap_swept_slot,
#if USE_RGENGC
gc_stat_compat_sym_remembered_shady_object,
gc_stat_compat_sym_remembered_shady_object_limit,
gc_stat_compat_sym_old_object,
gc_stat_compat_sym_old_object_limit,
#endif
gc_stat_compat_sym_total_allocated_object,
gc_stat_compat_sym_total_freed_object,
gc_stat_compat_sym_malloc_increase,
gc_stat_compat_sym_malloc_limit,
#if RGENGC_ESTIMATE_OLDMALLOC
gc_stat_compat_sym_oldmalloc_increase,
gc_stat_compat_sym_oldmalloc_limit,
#endif
gc_stat_compat_sym_last
};
static VALUE gc_stat_symbols[gc_stat_sym_last];
static VALUE gc_stat_compat_symbols[gc_stat_compat_sym_last];
static VALUE gc_stat_compat_table;
static void
setup_gc_stat_symbols(void)
{
if (gc_stat_symbols[0] == 0) {
#define S(s) gc_stat_symbols[gc_stat_sym_##s] = ID2SYM(rb_intern_const(#s))
S(count);
S(heap_allocated_pages);
S(heap_sorted_length);
S(heap_allocatable_pages);
S(heap_available_slots);
S(heap_live_slots);
S(heap_free_slots);
S(heap_final_slots);
S(heap_marked_slots);
S(heap_eden_pages);
S(heap_tomb_pages);
S(total_allocated_pages);
S(total_freed_pages);
S(total_allocated_objects);
S(total_freed_objects);
S(malloc_increase_bytes);
S(malloc_increase_bytes_limit);
#if USE_RGENGC
S(minor_gc_count);
S(major_gc_count);
S(compact_count);
S(remembered_wb_unprotected_objects);
S(remembered_wb_unprotected_objects_limit);
S(old_objects);
S(old_objects_limit);
#if RGENGC_ESTIMATE_OLDMALLOC
S(oldmalloc_increase_bytes);
S(oldmalloc_increase_bytes_limit);
#endif
#if RGENGC_PROFILE
S(total_generated_normal_object_count);
S(total_generated_shady_object_count);
S(total_shade_operation_count);
S(total_promoted_count);
S(total_remembered_normal_object_count);
S(total_remembered_shady_object_count);
#endif /* RGENGC_PROFILE */
#endif /* USE_RGENGC */
#undef S
#define S(s) gc_stat_compat_symbols[gc_stat_compat_sym_##s] = ID2SYM(rb_intern_const(#s))
S(gc_stat_heap_used);
S(heap_eden_page_length);
S(heap_tomb_page_length);
S(heap_increment);
S(heap_length);
S(heap_live_slot);
S(heap_free_slot);
S(heap_final_slot);
S(heap_swept_slot);
#if USE_RGEGC
S(remembered_shady_object);
S(remembered_shady_object_limit);
S(old_object);
S(old_object_limit);
#endif
S(total_allocated_object);
S(total_freed_object);
S(malloc_increase);
S(malloc_limit);
#if RGENGC_ESTIMATE_OLDMALLOC
S(oldmalloc_increase);
S(oldmalloc_limit);
#endif
#undef S
{
VALUE table = gc_stat_compat_table = rb_hash_new();
rb_obj_hide(table);
rb_gc_register_mark_object(table);
/* compatibility layer for Ruby 2.1 */
#define OLD_SYM(s) gc_stat_compat_symbols[gc_stat_compat_sym_##s]
#define NEW_SYM(s) gc_stat_symbols[gc_stat_sym_##s]
rb_hash_aset(table, OLD_SYM(gc_stat_heap_used), NEW_SYM(heap_allocated_pages));
rb_hash_aset(table, OLD_SYM(heap_eden_page_length), NEW_SYM(heap_eden_pages));
rb_hash_aset(table, OLD_SYM(heap_tomb_page_length), NEW_SYM(heap_tomb_pages));
rb_hash_aset(table, OLD_SYM(heap_increment), NEW_SYM(heap_allocatable_pages));
rb_hash_aset(table, OLD_SYM(heap_length), NEW_SYM(heap_sorted_length));
rb_hash_aset(table, OLD_SYM(heap_live_slot), NEW_SYM(heap_live_slots));
rb_hash_aset(table, OLD_SYM(heap_free_slot), NEW_SYM(heap_free_slots));
rb_hash_aset(table, OLD_SYM(heap_final_slot), NEW_SYM(heap_final_slots));
#if USE_RGEGC
rb_hash_aset(table, OLD_SYM(remembered_shady_object), NEW_SYM(remembered_wb_unprotected_objects));
rb_hash_aset(table, OLD_SYM(remembered_shady_object_limit), NEW_SYM(remembered_wb_unprotected_objects_limit));
rb_hash_aset(table, OLD_SYM(old_object), NEW_SYM(old_objects));
rb_hash_aset(table, OLD_SYM(old_object_limit), NEW_SYM(old_objects_limit));
#endif
rb_hash_aset(table, OLD_SYM(total_allocated_object), NEW_SYM(total_allocated_objects));
rb_hash_aset(table, OLD_SYM(total_freed_object), NEW_SYM(total_freed_objects));
rb_hash_aset(table, OLD_SYM(malloc_increase), NEW_SYM(malloc_increase_bytes));
rb_hash_aset(table, OLD_SYM(malloc_limit), NEW_SYM(malloc_increase_bytes_limit));
#if RGENGC_ESTIMATE_OLDMALLOC
rb_hash_aset(table, OLD_SYM(oldmalloc_increase), NEW_SYM(oldmalloc_increase_bytes));
rb_hash_aset(table, OLD_SYM(oldmalloc_limit), NEW_SYM(oldmalloc_increase_bytes_limit));
#endif
#undef OLD_SYM
#undef NEW_SYM
rb_obj_freeze(table);
}
}
}
static VALUE
compat_key(VALUE key)
{
VALUE new_key = rb_hash_lookup(gc_stat_compat_table, key);
if (!NIL_P(new_key)) {
static int warned = 0;
if (warned == 0) {
rb_warn("GC.stat keys were changed from Ruby 2.1. "
"In this case, you refer to obsolete `%"PRIsVALUE"' (new key is `%"PRIsVALUE"'). "
"Please check <https://bugs.ruby-lang.org/issues/9924> for more information.",
key, new_key);
warned = 1;
}
}
return new_key;
}
static VALUE
default_proc_for_compat_func(RB_BLOCK_CALL_FUNC_ARGLIST(hash, _))
{
VALUE key, new_key;
Check_Type(hash, T_HASH);
rb_check_arity(argc, 2, 2);
key = argv[1];
if ((new_key = compat_key(key)) != Qnil) {
return rb_hash_lookup(hash, new_key);
}
return Qnil;
}
static size_t
gc_stat_internal(VALUE hash_or_sym)
{
rb_objspace_t *objspace = &rb_objspace;
VALUE hash = Qnil, key = Qnil;
setup_gc_stat_symbols();
if (RB_TYPE_P(hash_or_sym, T_HASH)) {
hash = hash_or_sym;
if (NIL_P(RHASH_IFNONE(hash))) {
static VALUE default_proc_for_compat = 0;
if (default_proc_for_compat == 0) { /* TODO: it should be */
default_proc_for_compat = rb_proc_new(default_proc_for_compat_func, Qnil);
rb_gc_register_mark_object(default_proc_for_compat);
}
rb_hash_set_default_proc(hash, default_proc_for_compat);
}
}
else if (SYMBOL_P(hash_or_sym)) {
key = hash_or_sym;
}
else {
rb_raise(rb_eTypeError, "non-hash or symbol argument");
}
#define SET(name, attr) \
if (key == gc_stat_symbols[gc_stat_sym_##name]) \
return attr; \
else if (hash != Qnil) \
rb_hash_aset(hash, gc_stat_symbols[gc_stat_sym_##name], SIZET2NUM(attr));
again:
SET(count, objspace->profile.count);
/* implementation dependent counters */
SET(heap_allocated_pages, heap_allocated_pages);
SET(heap_sorted_length, heap_pages_sorted_length);
SET(heap_allocatable_pages, heap_allocatable_pages);
SET(heap_available_slots, objspace_available_slots(objspace));
SET(heap_live_slots, objspace_live_slots(objspace));
SET(heap_free_slots, objspace_free_slots(objspace));
SET(heap_final_slots, heap_pages_final_slots);
SET(heap_marked_slots, objspace->marked_slots);
SET(heap_eden_pages, heap_eden->total_pages);
SET(heap_tomb_pages, heap_tomb->total_pages);
SET(total_allocated_pages, objspace->profile.total_allocated_pages);
SET(total_freed_pages, objspace->profile.total_freed_pages);
SET(total_allocated_objects, objspace->total_allocated_objects);
SET(total_freed_objects, objspace->profile.total_freed_objects);
SET(malloc_increase_bytes, malloc_increase);
SET(malloc_increase_bytes_limit, malloc_limit);
#if USE_RGENGC
SET(minor_gc_count, objspace->profile.minor_gc_count);
SET(major_gc_count, objspace->profile.major_gc_count);
SET(compact_count, objspace->profile.compact_count);
SET(remembered_wb_unprotected_objects, objspace->rgengc.uncollectible_wb_unprotected_objects);
SET(remembered_wb_unprotected_objects_limit, objspace->rgengc.uncollectible_wb_unprotected_objects_limit);
SET(old_objects, objspace->rgengc.old_objects);
SET(old_objects_limit, objspace->rgengc.old_objects_limit);
#if RGENGC_ESTIMATE_OLDMALLOC
SET(oldmalloc_increase_bytes, objspace->rgengc.oldmalloc_increase);
SET(oldmalloc_increase_bytes_limit, objspace->rgengc.oldmalloc_increase_limit);
#endif
#if RGENGC_PROFILE
SET(total_generated_normal_object_count, objspace->profile.total_generated_normal_object_count);
SET(total_generated_shady_object_count, objspace->profile.total_generated_shady_object_count);
SET(total_shade_operation_count, objspace->profile.total_shade_operation_count);
SET(total_promoted_count, objspace->profile.total_promoted_count);
SET(total_remembered_normal_object_count, objspace->profile.total_remembered_normal_object_count);
SET(total_remembered_shady_object_count, objspace->profile.total_remembered_shady_object_count);
#endif /* RGENGC_PROFILE */
#endif /* USE_RGENGC */
#undef SET
if (!NIL_P(key)) { /* matched key should return above */
VALUE new_key;
if ((new_key = compat_key(key)) != Qnil) {
key = new_key;
goto again;
}
rb_raise(rb_eArgError, "unknown key: %"PRIsVALUE, rb_sym2str(key));
}
#if defined(RGENGC_PROFILE) && RGENGC_PROFILE >= 2
if (hash != Qnil) {
gc_count_add_each_types(hash, "generated_normal_object_count_types", objspace->profile.generated_normal_object_count_types);
gc_count_add_each_types(hash, "generated_shady_object_count_types", objspace->profile.generated_shady_object_count_types);
gc_count_add_each_types(hash, "shade_operation_count_types", objspace->profile.shade_operation_count_types);
gc_count_add_each_types(hash, "promoted_types", objspace->profile.promoted_types);
gc_count_add_each_types(hash, "remembered_normal_object_count_types", objspace->profile.remembered_normal_object_count_types);
gc_count_add_each_types(hash, "remembered_shady_object_count_types", objspace->profile.remembered_shady_object_count_types);
}
#endif
return 0;
}
static VALUE
gc_stat(rb_execution_context_t *ec, VALUE self, VALUE arg) // arg is (nil || hash || symbol)
{
if (NIL_P(arg)) {
arg = rb_hash_new();
}
else if (SYMBOL_P(arg)) {
size_t value = gc_stat_internal(arg);
return SIZET2NUM(value);
}
else if (RB_TYPE_P(arg, T_HASH)) {
// ok
}
else {
rb_raise(rb_eTypeError, "non-hash or symbol given");
}
gc_stat_internal(arg);
return arg;
}
size_t
rb_gc_stat(VALUE key)
{
if (SYMBOL_P(key)) {
size_t value = gc_stat_internal(key);
return value;
}
else {
gc_stat_internal(key);
return 0;
}
}
static VALUE
gc_stress_get(rb_execution_context_t *ec, VALUE self)
{
rb_objspace_t *objspace = &rb_objspace;
return ruby_gc_stress_mode;
}
static void
gc_stress_set(rb_objspace_t *objspace, VALUE flag)
{
objspace->flags.gc_stressful = RTEST(flag);
objspace->gc_stress_mode = flag;
}
static VALUE
gc_stress_set_m(rb_execution_context_t *ec, VALUE self, VALUE flag)
{
rb_objspace_t *objspace = &rb_objspace;
gc_stress_set(objspace, flag);
return flag;
}
VALUE
rb_gc_enable(void)
{
rb_objspace_t *objspace = &rb_objspace;
int old = dont_gc;
dont_gc = FALSE;
return old ? Qtrue : Qfalse;
}
static VALUE
gc_enable(rb_execution_context_t *ec, VALUE _)
{
return rb_gc_enable();
}
VALUE
rb_gc_disable_no_rest(void)
{
rb_objspace_t *objspace = &rb_objspace;
int old = dont_gc;
dont_gc = TRUE;
return old ? Qtrue : Qfalse;
}
VALUE
rb_gc_disable(void)
{
rb_objspace_t *objspace = &rb_objspace;
gc_rest(objspace);
return rb_gc_disable_no_rest();
}
static VALUE
gc_disable(rb_execution_context_t *ec, VALUE _)
{
return rb_gc_disable();
}
static int
get_envparam_size(const char *name, size_t *default_value, size_t lower_bound)
{
char *ptr = getenv(name);
ssize_t val;
if (ptr != NULL && *ptr) {
size_t unit = 0;
char *end;
#if SIZEOF_SIZE_T == SIZEOF_LONG_LONG
val = strtoll(ptr, &end, 0);
#else
val = strtol(ptr, &end, 0);
#endif
switch (*end) {
case 'k': case 'K':
unit = 1024;
++end;
break;
case 'm': case 'M':
unit = 1024*1024;
++end;
break;
case 'g': case 'G':
unit = 1024*1024*1024;
++end;
break;
}
while (*end && isspace((unsigned char)*end)) end++;
if (*end) {
if (RTEST(ruby_verbose)) fprintf(stderr, "invalid string for %s: %s\n", name, ptr);
return 0;
}
if (unit > 0) {
if (val < -(ssize_t)(SIZE_MAX / 2 / unit) || (ssize_t)(SIZE_MAX / 2 / unit) < val) {
if (RTEST(ruby_verbose)) fprintf(stderr, "%s=%s is ignored because it overflows\n", name, ptr);
return 0;
}
val *= unit;
}
if (val > 0 && (size_t)val > lower_bound) {
if (RTEST(ruby_verbose)) {
fprintf(stderr, "%s=%"PRIdSIZE" (default value: %"PRIuSIZE")\n", name, val, *default_value);
}
*default_value = (size_t)val;
return 1;
}
else {
if (RTEST(ruby_verbose)) {
fprintf(stderr, "%s=%"PRIdSIZE" (default value: %"PRIuSIZE") is ignored because it must be greater than %"PRIuSIZE".\n",
name, val, *default_value, lower_bound);
}
return 0;
}
}
return 0;
}
static int
get_envparam_double(const char *name, double *default_value, double lower_bound, double upper_bound, int accept_zero)
{
char *ptr = getenv(name);
double val;
if (ptr != NULL && *ptr) {
char *end;
val = strtod(ptr, &end);
if (!*ptr || *end) {
if (RTEST(ruby_verbose)) fprintf(stderr, "invalid string for %s: %s\n", name, ptr);
return 0;
}
if (accept_zero && val == 0.0) {
goto accept;
}
else if (val <= lower_bound) {
if (RTEST(ruby_verbose)) {
fprintf(stderr, "%s=%f (default value: %f) is ignored because it must be greater than %f.\n",
name, val, *default_value, lower_bound);
}
}
else if (upper_bound != 0.0 && /* ignore upper_bound if it is 0.0 */
val > upper_bound) {
if (RTEST(ruby_verbose)) {
fprintf(stderr, "%s=%f (default value: %f) is ignored because it must be lower than %f.\n",
name, val, *default_value, upper_bound);
}
}
else {
accept:
if (RTEST(ruby_verbose)) fprintf(stderr, "%s=%f (default value: %f)\n", name, val, *default_value);
*default_value = val;
return 1;
}
}
return 0;
}
static void
gc_set_initial_pages(void)
{
size_t min_pages;
rb_objspace_t *objspace = &rb_objspace;
min_pages = gc_params.heap_init_slots / HEAP_PAGE_OBJ_LIMIT;
if (min_pages > heap_eden->total_pages) {
heap_add_pages(objspace, heap_eden, min_pages - heap_eden->total_pages);
}
}
/*
* GC tuning environment variables
*
* * RUBY_GC_HEAP_INIT_SLOTS
* - Initial allocation slots.
* * RUBY_GC_HEAP_FREE_SLOTS
* - Prepare at least this amount of slots after GC.
* - Allocate slots if there are not enough slots.
* * RUBY_GC_HEAP_GROWTH_FACTOR (new from 2.1)
* - Allocate slots by this factor.
* - (next slots number) = (current slots number) * (this factor)
* * RUBY_GC_HEAP_GROWTH_MAX_SLOTS (new from 2.1)
* - Allocation rate is limited to this number of slots.
* * RUBY_GC_HEAP_FREE_SLOTS_MIN_RATIO (new from 2.4)
* - Allocate additional pages when the number of free slots is
* lower than the value (total_slots * (this ratio)).
* * RUBY_GC_HEAP_FREE_SLOTS_GOAL_RATIO (new from 2.4)
* - Allocate slots to satisfy this formula:
* free_slots = total_slots * goal_ratio
* - In other words, prepare (total_slots * goal_ratio) free slots.
* - if this value is 0.0, then use RUBY_GC_HEAP_GROWTH_FACTOR directly.
* * RUBY_GC_HEAP_FREE_SLOTS_MAX_RATIO (new from 2.4)
* - Allow to free pages when the number of free slots is
* greater than the value (total_slots * (this ratio)).
* * RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR (new from 2.1.1)
* - Do full GC when the number of old objects is more than R * N
* where R is this factor and
* N is the number of old objects just after last full GC.
*
* * obsolete
* * RUBY_FREE_MIN -> RUBY_GC_HEAP_FREE_SLOTS (from 2.1)
* * RUBY_HEAP_MIN_SLOTS -> RUBY_GC_HEAP_INIT_SLOTS (from 2.1)
*
* * RUBY_GC_MALLOC_LIMIT
* * RUBY_GC_MALLOC_LIMIT_MAX (new from 2.1)
* * RUBY_GC_MALLOC_LIMIT_GROWTH_FACTOR (new from 2.1)
*
* * RUBY_GC_OLDMALLOC_LIMIT (new from 2.1)
* * RUBY_GC_OLDMALLOC_LIMIT_MAX (new from 2.1)
* * RUBY_GC_OLDMALLOC_LIMIT_GROWTH_FACTOR (new from 2.1)
*/
void
ruby_gc_set_params(void)
{
/* RUBY_GC_HEAP_FREE_SLOTS */
if (get_envparam_size("RUBY_GC_HEAP_FREE_SLOTS", &gc_params.heap_free_slots, 0)) {
/* ok */
}
else if (get_envparam_size("RUBY_FREE_MIN", &gc_params.heap_free_slots, 0)) {
rb_warn("RUBY_FREE_MIN is obsolete. Use RUBY_GC_HEAP_FREE_SLOTS instead.");
}
/* RUBY_GC_HEAP_INIT_SLOTS */
if (get_envparam_size("RUBY_GC_HEAP_INIT_SLOTS", &gc_params.heap_init_slots, 0)) {
gc_set_initial_pages();
}
else if (get_envparam_size("RUBY_HEAP_MIN_SLOTS", &gc_params.heap_init_slots, 0)) {
rb_warn("RUBY_HEAP_MIN_SLOTS is obsolete. Use RUBY_GC_HEAP_INIT_SLOTS instead.");
gc_set_initial_pages();
}
get_envparam_double("RUBY_GC_HEAP_GROWTH_FACTOR", &gc_params.growth_factor, 1.0, 0.0, FALSE);
get_envparam_size ("RUBY_GC_HEAP_GROWTH_MAX_SLOTS", &gc_params.growth_max_slots, 0);
get_envparam_double("RUBY_GC_HEAP_FREE_SLOTS_MIN_RATIO", &gc_params.heap_free_slots_min_ratio,
0.0, 1.0, FALSE);
get_envparam_double("RUBY_GC_HEAP_FREE_SLOTS_MAX_RATIO", &gc_params.heap_free_slots_max_ratio,
gc_params.heap_free_slots_min_ratio, 1.0, FALSE);
get_envparam_double("RUBY_GC_HEAP_FREE_SLOTS_GOAL_RATIO", &gc_params.heap_free_slots_goal_ratio,
gc_params.heap_free_slots_min_ratio, gc_params.heap_free_slots_max_ratio, TRUE);
get_envparam_double("RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR", &gc_params.oldobject_limit_factor, 0.0, 0.0, TRUE);
get_envparam_size ("RUBY_GC_MALLOC_LIMIT", &gc_params.malloc_limit_min, 0);
get_envparam_size ("RUBY_GC_MALLOC_LIMIT_MAX", &gc_params.malloc_limit_max, 0);
if (!gc_params.malloc_limit_max) { /* ignore max-check if 0 */
gc_params.malloc_limit_max = SIZE_MAX;
}
get_envparam_double("RUBY_GC_MALLOC_LIMIT_GROWTH_FACTOR", &gc_params.malloc_limit_growth_factor, 1.0, 0.0, FALSE);
#if RGENGC_ESTIMATE_OLDMALLOC
if (get_envparam_size("RUBY_GC_OLDMALLOC_LIMIT", &gc_params.oldmalloc_limit_min, 0)) {
rb_objspace_t *objspace = &rb_objspace;
objspace->rgengc.oldmalloc_increase_limit = gc_params.oldmalloc_limit_min;
}
get_envparam_size ("RUBY_GC_OLDMALLOC_LIMIT_MAX", &gc_params.oldmalloc_limit_max, 0);
get_envparam_double("RUBY_GC_OLDMALLOC_LIMIT_GROWTH_FACTOR", &gc_params.oldmalloc_limit_growth_factor, 1.0, 0.0, FALSE);
#endif
}
void
rb_objspace_reachable_objects_from(VALUE obj, void (func)(VALUE, void *), void *data)
{
rb_objspace_t *objspace = &rb_objspace;
if (is_markable_object(objspace, obj)) {
struct mark_func_data_struct mfd;
mfd.mark_func = func;
mfd.data = data;
PUSH_MARK_FUNC_DATA(&mfd);
gc_mark_children(objspace, obj);
POP_MARK_FUNC_DATA();
}
}
struct root_objects_data {
const char *category;
void (*func)(const char *category, VALUE, void *);
void *data;
};
static void
root_objects_from(VALUE obj, void *ptr)
{
const struct root_objects_data *data = (struct root_objects_data *)ptr;
(*data->func)(data->category, obj, data->data);
}
void
rb_objspace_reachable_objects_from_root(void (func)(const char *category, VALUE, void *), void *passing_data)
{
rb_objspace_t *objspace = &rb_objspace;
objspace_reachable_objects_from_root(objspace, func, passing_data);
}
static void
objspace_reachable_objects_from_root(rb_objspace_t *objspace, void (func)(const char *category, VALUE, void *), void *passing_data)
{
struct root_objects_data data;
struct mark_func_data_struct mfd;
data.func = func;
data.data = passing_data;
mfd.mark_func = root_objects_from;
mfd.data = &data;
PUSH_MARK_FUNC_DATA(&mfd);
gc_mark_roots(objspace, &data.category);
POP_MARK_FUNC_DATA();
}
/*
------------------------ Extended allocator ------------------------
*/
struct gc_raise_tag {
VALUE exc;
const char *fmt;
va_list *ap;
};
static void *
gc_vraise(void *ptr)
{
struct gc_raise_tag *argv = ptr;
rb_vraise(argv->exc, argv->fmt, *argv->ap);
UNREACHABLE_RETURN(NULL);
}
static void
gc_raise(VALUE exc, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
struct gc_raise_tag argv = {
exc, fmt, &ap,
};
if (ruby_thread_has_gvl_p()) {
gc_vraise(&argv);
UNREACHABLE;
}
else if (ruby_native_thread_p()) {
rb_thread_call_with_gvl(gc_vraise, &argv);
UNREACHABLE;
}
else {
/* Not in a ruby thread */
fprintf(stderr, "%s", "[FATAL] ");
vfprintf(stderr, fmt, ap);
abort();
}
va_end(ap);
}
static void objspace_xfree(rb_objspace_t *objspace, void *ptr, size_t size);
static void
negative_size_allocation_error(const char *msg)
{
gc_raise(rb_eNoMemError, "%s", msg);
}
static void *
ruby_memerror_body(void *dummy)
{
rb_memerror();
return 0;
}
static void
ruby_memerror(void)
{
if (ruby_thread_has_gvl_p()) {
rb_memerror();
}
else {
if (ruby_native_thread_p()) {
rb_thread_call_with_gvl(ruby_memerror_body, 0);
}
else {
/* no ruby thread */
fprintf(stderr, "[FATAL] failed to allocate memory\n");
exit(EXIT_FAILURE);
}
}
}
void
rb_memerror(void)
{
rb_execution_context_t *ec = GET_EC();
rb_objspace_t *objspace = rb_objspace_of(rb_ec_vm_ptr(ec));
VALUE exc;
if (0) {
// Print out pid, sleep, so you can attach debugger to see what went wrong:
fprintf(stderr, "rb_memerror pid=%"PRI_PIDT_PREFIX"d\n", getpid());
sleep(60);
}
if (during_gc) gc_exit(objspace, "rb_memerror");
exc = nomem_error;
if (!exc ||
rb_ec_raised_p(ec, RAISED_NOMEMORY)) {
fprintf(stderr, "[FATAL] failed to allocate memory\n");
exit(EXIT_FAILURE);
}
if (rb_ec_raised_p(ec, RAISED_NOMEMORY)) {
rb_ec_raised_clear(ec);
}
else {
rb_ec_raised_set(ec, RAISED_NOMEMORY);
exc = ruby_vm_special_exception_copy(exc);
}
ec->errinfo = exc;
EC_JUMP_TAG(ec, TAG_RAISE);
}
void *
rb_aligned_malloc(size_t alignment, size_t size)
{
void *res;
#if defined __MINGW32__
res = __mingw_aligned_malloc(size, alignment);
#elif defined _WIN32
void *_aligned_malloc(size_t, size_t);
res = _aligned_malloc(size, alignment);
#elif defined(HAVE_POSIX_MEMALIGN)
if (posix_memalign(&res, alignment, size) == 0) {
return res;
}
else {
return NULL;
}
#elif defined(HAVE_MEMALIGN)
res = memalign(alignment, size);
#else
char* aligned;
res = malloc(alignment + size + sizeof(void*));
aligned = (char*)res + alignment + sizeof(void*);
aligned -= ((VALUE)aligned & (alignment - 1));
((void**)aligned)[-1] = res;
res = (void*)aligned;
#endif
/* alignment must be a power of 2 */
GC_ASSERT(((alignment - 1) & alignment) == 0);
GC_ASSERT(alignment % sizeof(void*) == 0);
return res;
}
void
rb_aligned_free(void *ptr)
{
#if defined __MINGW32__
__mingw_aligned_free(ptr);
#elif defined _WIN32
_aligned_free(ptr);
#elif defined(HAVE_MEMALIGN) || defined(HAVE_POSIX_MEMALIGN)
free(ptr);
#else
free(((void**)ptr)[-1]);
#endif
}
static inline size_t
objspace_malloc_size(rb_objspace_t *objspace, void *ptr, size_t hint)
{
#ifdef HAVE_MALLOC_USABLE_SIZE
return malloc_usable_size(ptr);
#else
return hint;
#endif
}
enum memop_type {
MEMOP_TYPE_MALLOC = 0,
MEMOP_TYPE_FREE,
MEMOP_TYPE_REALLOC
};
static inline void
atomic_sub_nounderflow(size_t *var, size_t sub)
{
if (sub == 0) return;
while (1) {
size_t val = *var;
if (val < sub) sub = val;
if (ATOMIC_SIZE_CAS(*var, val, val-sub) == val) break;
}
}
static void
objspace_malloc_gc_stress(rb_objspace_t *objspace)
{
if (ruby_gc_stressful && ruby_native_thread_p()) {
int reason = GPR_FLAG_IMMEDIATE_MARK | GPR_FLAG_IMMEDIATE_SWEEP |
GPR_FLAG_STRESS | GPR_FLAG_MALLOC;
if (gc_stress_full_mark_after_malloc_p()) {
reason |= GPR_FLAG_FULL_MARK;
}
garbage_collect_with_gvl(objspace, reason);
}
}
static void
objspace_malloc_increase(rb_objspace_t *objspace, void *mem, size_t new_size, size_t old_size, enum memop_type type)
{
if (new_size > old_size) {
ATOMIC_SIZE_ADD(malloc_increase, new_size - old_size);
#if RGENGC_ESTIMATE_OLDMALLOC
ATOMIC_SIZE_ADD(objspace->rgengc.oldmalloc_increase, new_size - old_size);
#endif
}
else {
atomic_sub_nounderflow(&malloc_increase, old_size - new_size);
#if RGENGC_ESTIMATE_OLDMALLOC
atomic_sub_nounderflow(&objspace->rgengc.oldmalloc_increase, old_size - new_size);
#endif
}
if (type == MEMOP_TYPE_MALLOC) {
retry:
if (malloc_increase > malloc_limit && ruby_native_thread_p() && !dont_gc) {
if (ruby_thread_has_gvl_p() && is_lazy_sweeping(heap_eden)) {
gc_rest(objspace); /* gc_rest can reduce malloc_increase */
goto retry;
}
garbage_collect_with_gvl(objspace, GPR_FLAG_MALLOC);
}
}
#if MALLOC_ALLOCATED_SIZE
if (new_size >= old_size) {
ATOMIC_SIZE_ADD(objspace->malloc_params.allocated_size, new_size - old_size);
}
else {
size_t dec_size = old_size - new_size;
size_t allocated_size = objspace->malloc_params.allocated_size;
#if MALLOC_ALLOCATED_SIZE_CHECK
if (allocated_size < dec_size) {
rb_bug("objspace_malloc_increase: underflow malloc_params.allocated_size.");
}
#endif
atomic_sub_nounderflow(&objspace->malloc_params.allocated_size, dec_size);
}
if (0) fprintf(stderr, "increase - ptr: %p, type: %s, new_size: %d, old_size: %d\n",
mem,
type == MEMOP_TYPE_MALLOC ? "malloc" :
type == MEMOP_TYPE_FREE ? "free " :
type == MEMOP_TYPE_REALLOC ? "realloc": "error",
(int)new_size, (int)old_size);
switch (type) {
case MEMOP_TYPE_MALLOC:
ATOMIC_SIZE_INC(objspace->malloc_params.allocations);
break;
case MEMOP_TYPE_FREE:
{
size_t allocations = objspace->malloc_params.allocations;
if (allocations > 0) {
atomic_sub_nounderflow(&objspace->malloc_params.allocations, 1);
}
#if MALLOC_ALLOCATED_SIZE_CHECK
else {
GC_ASSERT(objspace->malloc_params.allocations > 0);
}
#endif
}
break;
case MEMOP_TYPE_REALLOC: /* ignore */ break;
}
#endif
}
struct malloc_obj_info { /* 4 words */
size_t size;
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
size_t gen;
const char *file;
size_t line;
#endif
};
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
const char *ruby_malloc_info_file;
int ruby_malloc_info_line;
#endif
static inline size_t
objspace_malloc_prepare(rb_objspace_t *objspace, size_t size)
{
if (size == 0) size = 1;
#if CALC_EXACT_MALLOC_SIZE
size += sizeof(struct malloc_obj_info);
#endif
return size;
}
static inline void *
objspace_malloc_fixup(rb_objspace_t *objspace, void *mem, size_t size)
{
size = objspace_malloc_size(objspace, mem, size);
objspace_malloc_increase(objspace, mem, size, 0, MEMOP_TYPE_MALLOC);
#if CALC_EXACT_MALLOC_SIZE
{
struct malloc_obj_info *info = mem;
info->size = size;
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
info->gen = objspace->profile.count;
info->file = ruby_malloc_info_file;
info->line = info->file ? ruby_malloc_info_line : 0;
#else
info->file = NULL;
#endif
mem = info + 1;
}
#endif
return mem;
}
#define TRY_WITH_GC(alloc) do { \
objspace_malloc_gc_stress(objspace); \
if (!(alloc) && \
(!garbage_collect_with_gvl(objspace, GPR_FLAG_FULL_MARK | \
GPR_FLAG_IMMEDIATE_MARK | GPR_FLAG_IMMEDIATE_SWEEP | \
GPR_FLAG_MALLOC) || \
!(alloc))) { \
ruby_memerror(); \
} \
} while (0)
/* these shouldn't be called directly.
* objspace_* functinos do not check allocation size.
*/
static void *
objspace_xmalloc0(rb_objspace_t *objspace, size_t size)
{
void *mem;
size = objspace_malloc_prepare(objspace, size);
TRY_WITH_GC(mem = malloc(size));
RB_DEBUG_COUNTER_INC(heap_xmalloc);
return objspace_malloc_fixup(objspace, mem, size);
}
static inline size_t
xmalloc2_size(const size_t count, const size_t elsize)
{
return size_mul_or_raise(count, elsize, rb_eArgError);
}
static void *
objspace_xrealloc(rb_objspace_t *objspace, void *ptr, size_t new_size, size_t old_size)
{
void *mem;
if (!ptr) return objspace_xmalloc0(objspace, new_size);
/*
* The behavior of realloc(ptr, 0) is implementation defined.
* Therefore we don't use realloc(ptr, 0) for portability reason.
* see http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_400.htm
*/
if (new_size == 0) {
if ((mem = objspace_xmalloc0(objspace, 0)) != NULL) {
/*
* - OpenBSD's malloc(3) man page says that when 0 is passed, it
* returns a non-NULL pointer to an access-protected memory page.
* The returned pointer cannot be read / written at all, but
* still be a valid argument of free().
*
* https://man.openbsd.org/malloc.3
*
* - Linux's malloc(3) man page says that it _might_ perhaps return
* a non-NULL pointer when its argument is 0. That return value
* is safe (and is expected) to be passed to free().
*
* http://man7.org/linux/man-pages/man3/malloc.3.html
*
* - As I read the implementation jemalloc's malloc() returns fully
* normal 16 bytes memory region when its argument is 0.
*
* - As I read the implementation musl libc's malloc() returns
* fully normal 32 bytes memory region when its argument is 0.
*
* - Other malloc implementations can also return non-NULL.
*/
objspace_xfree(objspace, ptr, old_size);
return mem;
}
else {
/*
* It is dangerous to return NULL here, because that could lead to
* RCE. Fallback to 1 byte instead of zero.
*
* https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11932
*/
new_size = 1;
}
}
#if CALC_EXACT_MALLOC_SIZE
{
struct malloc_obj_info *info = (struct malloc_obj_info *)ptr - 1;
new_size += sizeof(struct malloc_obj_info);
ptr = info;
old_size = info->size;
}
#endif
old_size = objspace_malloc_size(objspace, ptr, old_size);
TRY_WITH_GC(mem = realloc(ptr, new_size));
new_size = objspace_malloc_size(objspace, mem, new_size);
#if CALC_EXACT_MALLOC_SIZE
{
struct malloc_obj_info *info = mem;
info->size = new_size;
mem = info + 1;
}
#endif
objspace_malloc_increase(objspace, mem, new_size, old_size, MEMOP_TYPE_REALLOC);
RB_DEBUG_COUNTER_INC(heap_xrealloc);
return mem;
}
#if CALC_EXACT_MALLOC_SIZE && USE_GC_MALLOC_OBJ_INFO_DETAILS
#define MALLOC_INFO_GEN_SIZE 100
#define MALLOC_INFO_SIZE_SIZE 10
static size_t malloc_info_gen_cnt[MALLOC_INFO_GEN_SIZE];
static size_t malloc_info_gen_size[MALLOC_INFO_GEN_SIZE];
static size_t malloc_info_size[MALLOC_INFO_SIZE_SIZE+1];
static st_table *malloc_info_file_table;
static int
mmalloc_info_file_i(st_data_t key, st_data_t val, st_data_t dmy)
{
const char *file = (void *)key;
const size_t *data = (void *)val;
fprintf(stderr, "%s\t%d\t%d\n", file, (int)data[0], (int)data[1]);
return ST_CONTINUE;
}
__attribute__((destructor))
void
rb_malloc_info_show_results(void)
{
int i;
fprintf(stderr, "* malloc_info gen statistics\n");
for (i=0; i<MALLOC_INFO_GEN_SIZE; i++) {
if (i == MALLOC_INFO_GEN_SIZE-1) {
fprintf(stderr, "more\t%d\t%d\n", (int)malloc_info_gen_cnt[i], (int)malloc_info_gen_size[i]);
}
else {
fprintf(stderr, "%d\t%d\t%d\n", i, (int)malloc_info_gen_cnt[i], (int)malloc_info_gen_size[i]);
}
}
fprintf(stderr, "* malloc_info size statistics\n");
for (i=0; i<MALLOC_INFO_SIZE_SIZE; i++) {
int s = 16 << i;
fprintf(stderr, "%d\t%d\n", (int)s, (int)malloc_info_size[i]);
}
fprintf(stderr, "more\t%d\n", (int)malloc_info_size[i]);
if (malloc_info_file_table) {
fprintf(stderr, "* malloc_info file statistics\n");
st_foreach(malloc_info_file_table, mmalloc_info_file_i, 0);
}
}
#else
void
rb_malloc_info_show_results(void)
{
}
#endif
static void
objspace_xfree(rb_objspace_t *objspace, void *ptr, size_t old_size)
{
if (!ptr) {
/*
* ISO/IEC 9899 says "If ptr is a null pointer, no action occurs" since
* its first version. We would better follow.
*/
return;
}
#if CALC_EXACT_MALLOC_SIZE
struct malloc_obj_info *info = (struct malloc_obj_info *)ptr - 1;
ptr = info;
old_size = info->size;
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
{
int gen = (int)(objspace->profile.count - info->gen);
int gen_index = gen >= MALLOC_INFO_GEN_SIZE ? MALLOC_INFO_GEN_SIZE-1 : gen;
int i;
malloc_info_gen_cnt[gen_index]++;
malloc_info_gen_size[gen_index] += info->size;
for (i=0; i<MALLOC_INFO_SIZE_SIZE; i++) {
size_t s = 16 << i;
if (info->size <= s) {
malloc_info_size[i]++;
goto found;
}
}
malloc_info_size[i]++;
found:;
{
st_data_t key = (st_data_t)info->file;
size_t *data;
if (malloc_info_file_table == NULL) {
malloc_info_file_table = st_init_numtable_with_size(1024);
}
if (st_lookup(malloc_info_file_table, key, (st_data_t *)&data)) {
/* hit */
}
else {
data = malloc(xmalloc2_size(2, sizeof(size_t)));
if (data == NULL) rb_bug("objspace_xfree: can not allocate memory");
data[0] = data[1] = 0;
st_insert(malloc_info_file_table, key, (st_data_t)data);
}
data[0] ++;
data[1] += info->size;
};
#if 0 /* verbose output */
if (gen >= 2) {
if (info->file) {
fprintf(stderr, "free - size:%d, gen:%d, pos: %s:%d\n", (int)info->size, gen, info->file, (int)info->line);
}
else {
fprintf(stderr, "free - size:%d, gen:%d\n", (int)info->size, gen);
}
}
#endif
}
#endif
#endif
old_size = objspace_malloc_size(objspace, ptr, old_size);
free(ptr);
RB_DEBUG_COUNTER_INC(heap_xfree);
objspace_malloc_increase(objspace, ptr, 0, old_size, MEMOP_TYPE_FREE);
}
static void *
ruby_xmalloc0(size_t size)
{
return objspace_xmalloc0(&rb_objspace, size);
}
void *
ruby_xmalloc_body(size_t size)
{
if ((ssize_t)size < 0) {
negative_size_allocation_error("too large allocation size");
}
return ruby_xmalloc0(size);
}
void
ruby_malloc_size_overflow(size_t count, size_t elsize)
{
rb_raise(rb_eArgError,
"malloc: possible integer overflow (%"PRIuSIZE"*%"PRIuSIZE")",
count, elsize);
}
void *
ruby_xmalloc2_body(size_t n, size_t size)
{
return objspace_xmalloc0(&rb_objspace, xmalloc2_size(n, size));
}
static void *
objspace_xcalloc(rb_objspace_t *objspace, size_t size)
{
void *mem;
size = objspace_malloc_prepare(objspace, size);
TRY_WITH_GC(mem = calloc1(size));
return objspace_malloc_fixup(objspace, mem, size);
}
void *
ruby_xcalloc_body(size_t n, size_t size)
{
return objspace_xcalloc(&rb_objspace, xmalloc2_size(n, size));
}
#ifdef ruby_sized_xrealloc
#undef ruby_sized_xrealloc
#endif
void *
ruby_sized_xrealloc(void *ptr, size_t new_size, size_t old_size)
{
if ((ssize_t)new_size < 0) {
negative_size_allocation_error("too large allocation size");
}
return objspace_xrealloc(&rb_objspace, ptr, new_size, old_size);
}
void *
ruby_xrealloc_body(void *ptr, size_t new_size)
{
return ruby_sized_xrealloc(ptr, new_size, 0);
}
#ifdef ruby_sized_xrealloc2
#undef ruby_sized_xrealloc2
#endif
void *
ruby_sized_xrealloc2(void *ptr, size_t n, size_t size, size_t old_n)
{
size_t len = xmalloc2_size(n, size);
return objspace_xrealloc(&rb_objspace, ptr, len, old_n * size);
}
void *
ruby_xrealloc2_body(void *ptr, size_t n, size_t size)
{
return ruby_sized_xrealloc2(ptr, n, size, 0);
}
#ifdef ruby_sized_xfree
#undef ruby_sized_xfree
#endif
void
ruby_sized_xfree(void *x, size_t size)
{
if (x) {
objspace_xfree(&rb_objspace, x, size);
}
}
void
ruby_xfree(void *x)
{
ruby_sized_xfree(x, 0);
}
void *
rb_xmalloc_mul_add(size_t x, size_t y, size_t z) /* x * y + z */
{
size_t w = size_mul_add_or_raise(x, y, z, rb_eArgError);
return ruby_xmalloc(w);
}
void *
rb_xrealloc_mul_add(const void *p, size_t x, size_t y, size_t z) /* x * y + z */
{
size_t w = size_mul_add_or_raise(x, y, z, rb_eArgError);
return ruby_xrealloc((void *)p, w);
}
void *
rb_xmalloc_mul_add_mul(size_t x, size_t y, size_t z, size_t w) /* x * y + z * w */
{
size_t u = size_mul_add_mul_or_raise(x, y, z, w, rb_eArgError);
return ruby_xmalloc(u);
}
void *
rb_xcalloc_mul_add_mul(size_t x, size_t y, size_t z, size_t w) /* x * y + z * w */
{
size_t u = size_mul_add_mul_or_raise(x, y, z, w, rb_eArgError);
return ruby_xcalloc(u, 1);
}
/* Mimic ruby_xmalloc, but need not rb_objspace.
* should return pointer suitable for ruby_xfree
*/
void *
ruby_mimmalloc(size_t size)
{
void *mem;
#if CALC_EXACT_MALLOC_SIZE
size += sizeof(struct malloc_obj_info);
#endif
mem = malloc(size);
#if CALC_EXACT_MALLOC_SIZE
if (!mem) {
return NULL;
}
else
/* set 0 for consistency of allocated_size/allocations */
{
struct malloc_obj_info *info = mem;
info->size = 0;
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
info->gen = 0;
info->file = NULL;
info->line = 0;
#else
info->file = NULL;
#endif
mem = info + 1;
}
#endif
return mem;
}
void
ruby_mimfree(void *ptr)
{
#if CALC_EXACT_MALLOC_SIZE
struct malloc_obj_info *info = (struct malloc_obj_info *)ptr - 1;
ptr = info;
#endif
free(ptr);
}
void *
rb_alloc_tmp_buffer_with_count(volatile VALUE *store, size_t size, size_t cnt)
{
void *ptr;
VALUE imemo;
rb_imemo_tmpbuf_t *tmpbuf;
/* Keep the order; allocate an empty imemo first then xmalloc, to
* get rid of potential memory leak */
imemo = rb_imemo_tmpbuf_auto_free_maybe_mark_buffer(NULL, 0);
*store = imemo;
ptr = ruby_xmalloc0(size);
tmpbuf = (rb_imemo_tmpbuf_t *)imemo;
tmpbuf->ptr = ptr;
tmpbuf->cnt = cnt;
return ptr;
}
void *
rb_alloc_tmp_buffer(volatile VALUE *store, long len)
{
long cnt;
if (len < 0 || (cnt = (long)roomof(len, sizeof(VALUE))) < 0) {
rb_raise(rb_eArgError, "negative buffer size (or size too big)");
}
return rb_alloc_tmp_buffer_with_count(store, len, cnt);
}
void
rb_free_tmp_buffer(volatile VALUE *store)
{
rb_imemo_tmpbuf_t *s = (rb_imemo_tmpbuf_t*)ATOMIC_VALUE_EXCHANGE(*store, 0);
if (s) {
void *ptr = ATOMIC_PTR_EXCHANGE(s->ptr, 0);
s->cnt = 0;
ruby_xfree(ptr);
}
}
#if MALLOC_ALLOCATED_SIZE
/*
* call-seq:
* GC.malloc_allocated_size -> Integer
*
* Returns the size of memory allocated by malloc().
*
* Only available if ruby was built with +CALC_EXACT_MALLOC_SIZE+.
*/
static VALUE
gc_malloc_allocated_size(VALUE self)
{
return UINT2NUM(rb_objspace.malloc_params.allocated_size);
}
/*
* call-seq:
* GC.malloc_allocations -> Integer
*
* Returns the number of malloc() allocations.
*
* Only available if ruby was built with +CALC_EXACT_MALLOC_SIZE+.
*/
static VALUE
gc_malloc_allocations(VALUE self)
{
return UINT2NUM(rb_objspace.malloc_params.allocations);
}
#endif
void
rb_gc_adjust_memory_usage(ssize_t diff)
{
rb_objspace_t *objspace = &rb_objspace;
if (diff > 0) {
objspace_malloc_increase(objspace, 0, diff, 0, MEMOP_TYPE_REALLOC);
}
else if (diff < 0) {
objspace_malloc_increase(objspace, 0, 0, -diff, MEMOP_TYPE_REALLOC);
}
}
/*
------------------------------ WeakMap ------------------------------
*/
struct weakmap {
st_table *obj2wmap; /* obj -> [ref,...] */
st_table *wmap2obj; /* ref -> obj */
VALUE final;
};
#define WMAP_DELETE_DEAD_OBJECT_IN_MARK 0
#if WMAP_DELETE_DEAD_OBJECT_IN_MARK
static int
wmap_mark_map(st_data_t key, st_data_t val, st_data_t arg)
{
rb_objspace_t *objspace = (rb_objspace_t *)arg;
VALUE obj = (VALUE)val;
if (!is_live_object(objspace, obj)) return ST_DELETE;
return ST_CONTINUE;
}
#endif
static void
wmap_compact(void *ptr)
{
struct weakmap *w = ptr;
if (w->wmap2obj) rb_gc_update_tbl_refs(w->wmap2obj);
if (w->obj2wmap) rb_gc_update_tbl_refs(w->obj2wmap);
w->final = rb_gc_location(w->final);
}
static void
wmap_mark(void *ptr)
{
struct weakmap *w = ptr;
#if WMAP_DELETE_DEAD_OBJECT_IN_MARK
if (w->obj2wmap) st_foreach(w->obj2wmap, wmap_mark_map, (st_data_t)&rb_objspace);
#endif
rb_gc_mark_movable(w->final);
}
static int
wmap_free_map(st_data_t key, st_data_t val, st_data_t arg)
{
VALUE *ptr = (VALUE *)val;
ruby_sized_xfree(ptr, (ptr[0] + 1) * sizeof(VALUE));
return ST_CONTINUE;
}
static void
wmap_free(void *ptr)
{
struct weakmap *w = ptr;
st_foreach(w->obj2wmap, wmap_free_map, 0);
st_free_table(w->obj2wmap);
st_free_table(w->wmap2obj);
}
static int
wmap_memsize_map(st_data_t key, st_data_t val, st_data_t arg)
{
VALUE *ptr = (VALUE *)val;
*(size_t *)arg += (ptr[0] + 1) * sizeof(VALUE);
return ST_CONTINUE;
}
static size_t
wmap_memsize(const void *ptr)
{
size_t size;
const struct weakmap *w = ptr;
size = sizeof(*w);
size += st_memsize(w->obj2wmap);
size += st_memsize(w->wmap2obj);
st_foreach(w->obj2wmap, wmap_memsize_map, (st_data_t)&size);
return size;
}
static const rb_data_type_t weakmap_type = {
"weakmap",
{
wmap_mark,
wmap_free,
wmap_memsize,
wmap_compact,
},
0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};
extern const struct st_hash_type rb_hashtype_ident;
static VALUE wmap_finalize(RB_BLOCK_CALL_FUNC_ARGLIST(objid, self));
static VALUE
wmap_allocate(VALUE klass)
{
struct weakmap *w;
VALUE obj = TypedData_Make_Struct(klass, struct weakmap, &weakmap_type, w);
w->obj2wmap = st_init_table(&rb_hashtype_ident);
w->wmap2obj = st_init_table(&rb_hashtype_ident);
w->final = rb_func_lambda_new(wmap_finalize, obj, 1, 1);
return obj;
}
static int
wmap_live_p(rb_objspace_t *objspace, VALUE obj)
{
if (!FL_ABLE(obj)) return TRUE;
if (!is_id_value(objspace, obj)) return FALSE;
if (!is_live_object(objspace, obj)) return FALSE;
return TRUE;
}
static int
wmap_final_func(st_data_t *key, st_data_t *value, st_data_t arg, int existing)
{
VALUE wmap, *ptr, size, i, j;
if (!existing) return ST_STOP;
wmap = (VALUE)arg, ptr = (VALUE *)*value;
for (i = j = 1, size = ptr[0]; i <= size; ++i) {
if (ptr[i] != wmap) {
ptr[j++] = ptr[i];
}
}
if (j == 1) {
ruby_sized_xfree(ptr, i * sizeof(VALUE));
return ST_DELETE;
}
if (j < i) {
SIZED_REALLOC_N(ptr, VALUE, j + 1, i);
ptr[0] = j;
*value = (st_data_t)ptr;
}
return ST_CONTINUE;
}
/* :nodoc: */
static VALUE
wmap_finalize(RB_BLOCK_CALL_FUNC_ARGLIST(objid, self))
{
st_data_t orig, wmap, data;
VALUE obj, *rids, i, size;
struct weakmap *w;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
/* Get reference from object id. */
obj = id2ref(objid);
/* obj is original referenced object and/or weak reference. */
orig = (st_data_t)obj;
if (st_delete(w->obj2wmap, &orig, &data)) {
rids = (VALUE *)data;
size = *rids++;
for (i = 0; i < size; ++i) {
wmap = (st_data_t)rids[i];
st_delete(w->wmap2obj, &wmap, NULL);
}
ruby_sized_xfree((VALUE *)data, (size + 1) * sizeof(VALUE));
}
wmap = (st_data_t)obj;
if (st_delete(w->wmap2obj, &wmap, &orig)) {
wmap = (st_data_t)obj;
st_update(w->obj2wmap, orig, wmap_final_func, wmap);
}
return self;
}
struct wmap_iter_arg {
rb_objspace_t *objspace;
VALUE value;
};
static int
wmap_inspect_i(st_data_t key, st_data_t val, st_data_t arg)
{
VALUE str = (VALUE)arg;
VALUE k = (VALUE)key, v = (VALUE)val;
if (RSTRING_PTR(str)[0] == '#') {
rb_str_cat2(str, ", ");
}
else {
rb_str_cat2(str, ": ");
RSTRING_PTR(str)[0] = '#';
}
k = SPECIAL_CONST_P(k) ? rb_inspect(k) : rb_any_to_s(k);
rb_str_append(str, k);
rb_str_cat2(str, " => ");
v = SPECIAL_CONST_P(v) ? rb_inspect(v) : rb_any_to_s(v);
rb_str_append(str, v);
return ST_CONTINUE;
}
static VALUE
wmap_inspect(VALUE self)
{
VALUE str;
VALUE c = rb_class_name(CLASS_OF(self));
struct weakmap *w;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
str = rb_sprintf("-<%"PRIsVALUE":%p", c, (void *)self);
if (w->wmap2obj) {
st_foreach(w->wmap2obj, wmap_inspect_i, str);
}
RSTRING_PTR(str)[0] = '#';
rb_str_cat2(str, ">");
return str;
}
static int
wmap_each_i(st_data_t key, st_data_t val, st_data_t arg)
{
rb_objspace_t *objspace = (rb_objspace_t *)arg;
VALUE obj = (VALUE)val;
if (wmap_live_p(objspace, obj)) {
rb_yield_values(2, (VALUE)key, obj);
}
return ST_CONTINUE;
}
/* Iterates over keys and objects in a weakly referenced object */
static VALUE
wmap_each(VALUE self)
{
struct weakmap *w;
rb_objspace_t *objspace = &rb_objspace;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
st_foreach(w->wmap2obj, wmap_each_i, (st_data_t)objspace);
return self;
}
static int
wmap_each_key_i(st_data_t key, st_data_t val, st_data_t arg)
{
rb_objspace_t *objspace = (rb_objspace_t *)arg;
VALUE obj = (VALUE)val;
if (wmap_live_p(objspace, obj)) {
rb_yield((VALUE)key);
}
return ST_CONTINUE;
}
/* Iterates over keys and objects in a weakly referenced object */
static VALUE
wmap_each_key(VALUE self)
{
struct weakmap *w;
rb_objspace_t *objspace = &rb_objspace;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
st_foreach(w->wmap2obj, wmap_each_key_i, (st_data_t)objspace);
return self;
}
static int
wmap_each_value_i(st_data_t key, st_data_t val, st_data_t arg)
{
rb_objspace_t *objspace = (rb_objspace_t *)arg;
VALUE obj = (VALUE)val;
if (wmap_live_p(objspace, obj)) {
rb_yield(obj);
}
return ST_CONTINUE;
}
/* Iterates over keys and objects in a weakly referenced object */
static VALUE
wmap_each_value(VALUE self)
{
struct weakmap *w;
rb_objspace_t *objspace = &rb_objspace;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
st_foreach(w->wmap2obj, wmap_each_value_i, (st_data_t)objspace);
return self;
}
static int
wmap_keys_i(st_data_t key, st_data_t val, st_data_t arg)
{
struct wmap_iter_arg *argp = (struct wmap_iter_arg *)arg;
rb_objspace_t *objspace = argp->objspace;
VALUE ary = argp->value;
VALUE obj = (VALUE)val;
if (wmap_live_p(objspace, obj)) {
rb_ary_push(ary, (VALUE)key);
}
return ST_CONTINUE;
}
/* Iterates over keys and objects in a weakly referenced object */
static VALUE
wmap_keys(VALUE self)
{
struct weakmap *w;
struct wmap_iter_arg args;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
args.objspace = &rb_objspace;
args.value = rb_ary_new();
st_foreach(w->wmap2obj, wmap_keys_i, (st_data_t)&args);
return args.value;
}
static int
wmap_values_i(st_data_t key, st_data_t val, st_data_t arg)
{
struct wmap_iter_arg *argp = (struct wmap_iter_arg *)arg;
rb_objspace_t *objspace = argp->objspace;
VALUE ary = argp->value;
VALUE obj = (VALUE)val;
if (wmap_live_p(objspace, obj)) {
rb_ary_push(ary, obj);
}
return ST_CONTINUE;
}
/* Iterates over values and objects in a weakly referenced object */
static VALUE
wmap_values(VALUE self)
{
struct weakmap *w;
struct wmap_iter_arg args;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
args.objspace = &rb_objspace;
args.value = rb_ary_new();
st_foreach(w->wmap2obj, wmap_values_i, (st_data_t)&args);
return args.value;
}
static int
wmap_aset_update(st_data_t *key, st_data_t *val, st_data_t arg, int existing)
{
VALUE size, *ptr, *optr;
if (existing) {
size = (ptr = optr = (VALUE *)*val)[0];
++size;
SIZED_REALLOC_N(ptr, VALUE, size + 1, size);
}
else {
optr = 0;
size = 1;
ptr = ruby_xmalloc0(2 * sizeof(VALUE));
}
ptr[0] = size;
ptr[size] = (VALUE)arg;
if (ptr == optr) return ST_STOP;
*val = (st_data_t)ptr;
return ST_CONTINUE;
}
/* Creates a weak reference from the given key to the given value */
static VALUE
wmap_aset(VALUE self, VALUE wmap, VALUE orig)
{
struct weakmap *w;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
if (FL_ABLE(orig)) {
define_final0(orig, w->final);
}
if (FL_ABLE(wmap)) {
define_final0(wmap, w->final);
}
st_update(w->obj2wmap, (st_data_t)orig, wmap_aset_update, wmap);
st_insert(w->wmap2obj, (st_data_t)wmap, (st_data_t)orig);
return nonspecial_obj_id(orig);
}
/* Retrieves a weakly referenced object with the given key */
static VALUE
wmap_aref(VALUE self, VALUE wmap)
{
st_data_t data;
VALUE obj;
struct weakmap *w;
rb_objspace_t *objspace = &rb_objspace;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
if (!st_lookup(w->wmap2obj, (st_data_t)wmap, &data)) return Qnil;
obj = (VALUE)data;
if (!wmap_live_p(objspace, obj)) return Qnil;
return obj;
}
/* Returns +true+ if +key+ is registered */
static VALUE
wmap_has_key(VALUE self, VALUE key)
{
return NIL_P(wmap_aref(self, key)) ? Qfalse : Qtrue;
}
/* Returns the number of referenced objects */
static VALUE
wmap_size(VALUE self)
{
struct weakmap *w;
st_index_t n;
TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);
n = w->wmap2obj->num_entries;
#if SIZEOF_ST_INDEX_T <= SIZEOF_LONG
return ULONG2NUM(n);
#else
return ULL2NUM(n);
#endif
}
/*
------------------------------ GC profiler ------------------------------
*/
#define GC_PROFILE_RECORD_DEFAULT_SIZE 100
/* return sec in user time */
static double
getrusage_time(void)
{
#if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_PROCESS_CPUTIME_ID)
{
static int try_clock_gettime = 1;
struct timespec ts;
if (try_clock_gettime && clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts) == 0) {
return ts.tv_sec + ts.tv_nsec * 1e-9;
}
else {
try_clock_gettime = 0;
}
}
#endif
#ifdef RUSAGE_SELF
{
struct rusage usage;
struct timeval time;
if (getrusage(RUSAGE_SELF, &usage) == 0) {
time = usage.ru_utime;
return time.tv_sec + time.tv_usec * 1e-6;
}
}
#endif
#ifdef _WIN32
{
FILETIME creation_time, exit_time, kernel_time, user_time;
ULARGE_INTEGER ui;
LONG_LONG q;
double t;
if (GetProcessTimes(GetCurrentProcess(),
&creation_time, &exit_time, &kernel_time, &user_time) != 0) {
memcpy(&ui, &user_time, sizeof(FILETIME));
q = ui.QuadPart / 10L;
t = (DWORD)(q % 1000000L) * 1e-6;
q /= 1000000L;
#ifdef __GNUC__
t += q;
#else
t += (double)(DWORD)(q >> 16) * (1 << 16);
t += (DWORD)q & ~(~0 << 16);
#endif
return t;
}
}
#endif
return 0.0;
}
static inline void
gc_prof_setup_new_record(rb_objspace_t *objspace, int reason)
{
if (objspace->profile.run) {
size_t index = objspace->profile.next_index;
gc_profile_record *record;
/* create new record */
objspace->profile.next_index++;
if (!objspace->profile.records) {
objspace->profile.size = GC_PROFILE_RECORD_DEFAULT_SIZE;
objspace->profile.records = malloc(xmalloc2_size(sizeof(gc_profile_record), objspace->profile.size));
}
if (index >= objspace->profile.size) {
void *ptr;
objspace->profile.size += 1000;
ptr = realloc(objspace->profile.records, xmalloc2_size(sizeof(gc_profile_record), objspace->profile.size));
if (!ptr) rb_memerror();
objspace->profile.records = ptr;
}
if (!objspace->profile.records) {
rb_bug("gc_profile malloc or realloc miss");
}
record = objspace->profile.current_record = &objspace->profile.records[objspace->profile.next_index - 1];
MEMZERO(record, gc_profile_record, 1);
/* setup before-GC parameter */
record->flags = reason | (ruby_gc_stressful ? GPR_FLAG_STRESS : 0);
#if MALLOC_ALLOCATED_SIZE
record->allocated_size = malloc_allocated_size;
#endif
#if GC_PROFILE_MORE_DETAIL && GC_PROFILE_DETAIL_MEMORY
#ifdef RUSAGE_SELF
{
struct rusage usage;
if (getrusage(RUSAGE_SELF, &usage) == 0) {
record->maxrss = usage.ru_maxrss;
record->minflt = usage.ru_minflt;
record->majflt = usage.ru_majflt;
}
}
#endif
#endif
}
}
static inline void
gc_prof_timer_start(rb_objspace_t *objspace)
{
if (gc_prof_enabled(objspace)) {
gc_profile_record *record = gc_prof_record(objspace);
#if GC_PROFILE_MORE_DETAIL
record->prepare_time = objspace->profile.prepare_time;
#endif
record->gc_time = 0;
record->gc_invoke_time = getrusage_time();
}
}
static double
elapsed_time_from(double time)
{
double now = getrusage_time();
if (now > time) {
return now - time;
}
else {
return 0;
}
}
static inline void
gc_prof_timer_stop(rb_objspace_t *objspace)
{
if (gc_prof_enabled(objspace)) {
gc_profile_record *record = gc_prof_record(objspace);
record->gc_time = elapsed_time_from(record->gc_invoke_time);
record->gc_invoke_time -= objspace->profile.invoke_time;
}
}
#define RUBY_DTRACE_GC_HOOK(name) \
do {if (RUBY_DTRACE_GC_##name##_ENABLED()) RUBY_DTRACE_GC_##name();} while (0)
static inline void
gc_prof_mark_timer_start(rb_objspace_t *objspace)
{
RUBY_DTRACE_GC_HOOK(MARK_BEGIN);
#if GC_PROFILE_MORE_DETAIL
if (gc_prof_enabled(objspace)) {
gc_prof_record(objspace)->gc_mark_time = getrusage_time();
}
#endif
}
static inline void
gc_prof_mark_timer_stop(rb_objspace_t *objspace)
{
RUBY_DTRACE_GC_HOOK(MARK_END);
#if GC_PROFILE_MORE_DETAIL
if (gc_prof_enabled(objspace)) {
gc_profile_record *record = gc_prof_record(objspace);
record->gc_mark_time = elapsed_time_from(record->gc_mark_time);
}
#endif
}
static inline void
gc_prof_sweep_timer_start(rb_objspace_t *objspace)
{
RUBY_DTRACE_GC_HOOK(SWEEP_BEGIN);
if (gc_prof_enabled(objspace)) {
gc_profile_record *record = gc_prof_record(objspace);
if (record->gc_time > 0 || GC_PROFILE_MORE_DETAIL) {
objspace->profile.gc_sweep_start_time = getrusage_time();
}
}
}
static inline void
gc_prof_sweep_timer_stop(rb_objspace_t *objspace)
{
RUBY_DTRACE_GC_HOOK(SWEEP_END);
if (gc_prof_enabled(objspace)) {
double sweep_time;
gc_profile_record *record = gc_prof_record(objspace);
if (record->gc_time > 0) {
sweep_time = elapsed_time_from(objspace->profile.gc_sweep_start_time);
/* need to accumulate GC time for lazy sweep after gc() */
record->gc_time += sweep_time;
}
else if (GC_PROFILE_MORE_DETAIL) {
sweep_time = elapsed_time_from(objspace->profile.gc_sweep_start_time);
}
#if GC_PROFILE_MORE_DETAIL
record->gc_sweep_time += sweep_time;
if (heap_pages_deferred_final) record->flags |= GPR_FLAG_HAVE_FINALIZE;
#endif
if (heap_pages_deferred_final) objspace->profile.latest_gc_info |= GPR_FLAG_HAVE_FINALIZE;
}
}
static inline void
gc_prof_set_malloc_info(rb_objspace_t *objspace)
{
#if GC_PROFILE_MORE_DETAIL
if (gc_prof_enabled(objspace)) {
gc_profile_record *record = gc_prof_record(objspace);
record->allocate_increase = malloc_increase;
record->allocate_limit = malloc_limit;
}
#endif
}
static inline void
gc_prof_set_heap_info(rb_objspace_t *objspace)
{
if (gc_prof_enabled(objspace)) {
gc_profile_record *record = gc_prof_record(objspace);
size_t live = objspace->profile.total_allocated_objects_at_gc_start - objspace->profile.total_freed_objects;
size_t total = objspace->profile.heap_used_at_gc_start * HEAP_PAGE_OBJ_LIMIT;
#if GC_PROFILE_MORE_DETAIL
record->heap_use_pages = objspace->profile.heap_used_at_gc_start;
record->heap_live_objects = live;
record->heap_free_objects = total - live;
#endif
record->heap_total_objects = total;
record->heap_use_size = live * sizeof(RVALUE);
record->heap_total_size = total * sizeof(RVALUE);
}
}
/*
* call-seq:
* GC::Profiler.clear -> nil
*
* Clears the GC profiler data.
*
*/
static VALUE
gc_profile_clear(VALUE _)
{
rb_objspace_t *objspace = &rb_objspace;
void *p = objspace->profile.records;
objspace->profile.records = NULL;
objspace->profile.size = 0;
objspace->profile.next_index = 0;
objspace->profile.current_record = 0;
if (p) {
free(p);
}
return Qnil;
}
/*
* call-seq:
* GC::Profiler.raw_data -> [Hash, ...]
*
* Returns an Array of individual raw profile data Hashes ordered
* from earliest to latest by +:GC_INVOKE_TIME+.
*
* For example:
*
* [
* {
* :GC_TIME=>1.3000000000000858e-05,
* :GC_INVOKE_TIME=>0.010634999999999999,
* :HEAP_USE_SIZE=>289640,
* :HEAP_TOTAL_SIZE=>588960,
* :HEAP_TOTAL_OBJECTS=>14724,
* :GC_IS_MARKED=>false
* },
* # ...
* ]
*
* The keys mean:
*
* +:GC_TIME+::
* Time elapsed in seconds for this GC run
* +:GC_INVOKE_TIME+::
* Time elapsed in seconds from startup to when the GC was invoked
* +:HEAP_USE_SIZE+::
* Total bytes of heap used
* +:HEAP_TOTAL_SIZE+::
* Total size of heap in bytes
* +:HEAP_TOTAL_OBJECTS+::
* Total number of objects
* +:GC_IS_MARKED+::
* Returns +true+ if the GC is in mark phase
*
* If ruby was built with +GC_PROFILE_MORE_DETAIL+, you will also have access
* to the following hash keys:
*
* +:GC_MARK_TIME+::
* +:GC_SWEEP_TIME+::
* +:ALLOCATE_INCREASE+::
* +:ALLOCATE_LIMIT+::
* +:HEAP_USE_PAGES+::
* +:HEAP_LIVE_OBJECTS+::
* +:HEAP_FREE_OBJECTS+::
* +:HAVE_FINALIZE+::
*
*/
static VALUE
gc_profile_record_get(VALUE _)
{
VALUE prof;
VALUE gc_profile = rb_ary_new();
size_t i;
rb_objspace_t *objspace = (&rb_objspace);
if (!objspace->profile.run) {
return Qnil;
}
for (i =0; i < objspace->profile.next_index; i++) {
gc_profile_record *record = &objspace->profile.records[i];
prof = rb_hash_new();
rb_hash_aset(prof, ID2SYM(rb_intern("GC_FLAGS")), gc_info_decode(0, rb_hash_new(), record->flags));
rb_hash_aset(prof, ID2SYM(rb_intern("GC_TIME")), DBL2NUM(record->gc_time));
rb_hash_aset(prof, ID2SYM(rb_intern("GC_INVOKE_TIME")), DBL2NUM(record->gc_invoke_time));
rb_hash_aset(prof, ID2SYM(rb_intern("HEAP_USE_SIZE")), SIZET2NUM(record->heap_use_size));
rb_hash_aset(prof, ID2SYM(rb_intern("HEAP_TOTAL_SIZE")), SIZET2NUM(record->heap_total_size));
rb_hash_aset(prof, ID2SYM(rb_intern("HEAP_TOTAL_OBJECTS")), SIZET2NUM(record->heap_total_objects));
rb_hash_aset(prof, ID2SYM(rb_intern("GC_IS_MARKED")), Qtrue);
#if GC_PROFILE_MORE_DETAIL
rb_hash_aset(prof, ID2SYM(rb_intern("GC_MARK_TIME")), DBL2NUM(record->gc_mark_time));
rb_hash_aset(prof, ID2SYM(rb_intern("GC_SWEEP_TIME")), DBL2NUM(record->gc_sweep_time));
rb_hash_aset(prof, ID2SYM(rb_intern("ALLOCATE_INCREASE")), SIZET2NUM(record->allocate_increase));
rb_hash_aset(prof, ID2SYM(rb_intern("ALLOCATE_LIMIT")), SIZET2NUM(record->allocate_limit));
rb_hash_aset(prof, ID2SYM(rb_intern("HEAP_USE_PAGES")), SIZET2NUM(record->heap_use_pages));
rb_hash_aset(prof, ID2SYM(rb_intern("HEAP_LIVE_OBJECTS")), SIZET2NUM(record->heap_live_objects));
rb_hash_aset(prof, ID2SYM(rb_intern("HEAP_FREE_OBJECTS")), SIZET2NUM(record->heap_free_objects));
rb_hash_aset(prof, ID2SYM(rb_intern("REMOVING_OBJECTS")), SIZET2NUM(record->removing_objects));
rb_hash_aset(prof, ID2SYM(rb_intern("EMPTY_OBJECTS")), SIZET2NUM(record->empty_objects));
rb_hash_aset(prof, ID2SYM(rb_intern("HAVE_FINALIZE")), (record->flags & GPR_FLAG_HAVE_FINALIZE) ? Qtrue : Qfalse);
#endif
#if RGENGC_PROFILE > 0
rb_hash_aset(prof, ID2SYM(rb_intern("OLD_OBJECTS")), SIZET2NUM(record->old_objects));
rb_hash_aset(prof, ID2SYM(rb_intern("REMEMBERED_NORMAL_OBJECTS")), SIZET2NUM(record->remembered_normal_objects));
rb_hash_aset(prof, ID2SYM(rb_intern("REMEMBERED_SHADY_OBJECTS")), SIZET2NUM(record->remembered_shady_objects));
#endif
rb_ary_push(gc_profile, prof);
}
return gc_profile;
}
#if GC_PROFILE_MORE_DETAIL
#define MAJOR_REASON_MAX 0x10
static char *
gc_profile_dump_major_reason(int flags, char *buff)
{
int reason = flags & GPR_FLAG_MAJOR_MASK;
int i = 0;
if (reason == GPR_FLAG_NONE) {
buff[0] = '-';
buff[1] = 0;
}
else {
#define C(x, s) \
if (reason & GPR_FLAG_MAJOR_BY_##x) { \
buff[i++] = #x[0]; \
if (i >= MAJOR_REASON_MAX) rb_bug("gc_profile_dump_major_reason: overflow"); \
buff[i] = 0; \
}
C(NOFREE, N);
C(OLDGEN, O);
C(SHADY, S);
#if RGENGC_ESTIMATE_OLDMALLOC
C(OLDMALLOC, M);
#endif
#undef C
}
return buff;
}
#endif
static void
gc_profile_dump_on(VALUE out, VALUE (*append)(VALUE, VALUE))
{
rb_objspace_t *objspace = &rb_objspace;
size_t count = objspace->profile.next_index;
#ifdef MAJOR_REASON_MAX
char reason_str[MAJOR_REASON_MAX];
#endif
if (objspace->profile.run && count /* > 1 */) {
size_t i;
const gc_profile_record *record;
append(out, rb_sprintf("GC %"PRIuSIZE" invokes.\n", objspace->profile.count));
append(out, rb_str_new_cstr("Index Invoke Time(sec) Use Size(byte) Total Size(byte) Total Object GC Time(ms)\n"));
for (i = 0; i < count; i++) {
record = &objspace->profile.records[i];
append(out, rb_sprintf("%5"PRIuSIZE" %19.3f %20"PRIuSIZE" %20"PRIuSIZE" %20"PRIuSIZE" %30.20f\n",
i+1, record->gc_invoke_time, record->heap_use_size,
record->heap_total_size, record->heap_total_objects, record->gc_time*1000));
}
#if GC_PROFILE_MORE_DETAIL
append(out, rb_str_new_cstr("\n\n" \
"More detail.\n" \
"Prepare Time = Previously GC's rest sweep time\n"
"Index Flags Allocate Inc. Allocate Limit"
#if CALC_EXACT_MALLOC_SIZE
" Allocated Size"
#endif
" Use Page Mark Time(ms) Sweep Time(ms) Prepare Time(ms) LivingObj FreeObj RemovedObj EmptyObj"
#if RGENGC_PROFILE
" OldgenObj RemNormObj RemShadObj"
#endif
#if GC_PROFILE_DETAIL_MEMORY
" MaxRSS(KB) MinorFLT MajorFLT"
#endif
"\n"));
for (i = 0; i < count; i++) {
record = &objspace->profile.records[i];
append(out, rb_sprintf("%5"PRIuSIZE" %4s/%c/%6s%c %13"PRIuSIZE" %15"PRIuSIZE
#if CALC_EXACT_MALLOC_SIZE
" %15"PRIuSIZE
#endif
" %9"PRIuSIZE" %17.12f %17.12f %17.12f %10"PRIuSIZE" %10"PRIuSIZE" %10"PRIuSIZE" %10"PRIuSIZE
#if RGENGC_PROFILE
"%10"PRIuSIZE" %10"PRIuSIZE" %10"PRIuSIZE
#endif
#if GC_PROFILE_DETAIL_MEMORY
"%11ld %8ld %8ld"
#endif
"\n",
i+1,
gc_profile_dump_major_reason(record->flags, reason_str),
(record->flags & GPR_FLAG_HAVE_FINALIZE) ? 'F' : '.',
(record->flags & GPR_FLAG_NEWOBJ) ? "NEWOBJ" :
(record->flags & GPR_FLAG_MALLOC) ? "MALLOC" :
(record->flags & GPR_FLAG_METHOD) ? "METHOD" :
(record->flags & GPR_FLAG_CAPI) ? "CAPI__" : "??????",
(record->flags & GPR_FLAG_STRESS) ? '!' : ' ',
record->allocate_increase, record->allocate_limit,
#if CALC_EXACT_MALLOC_SIZE
record->allocated_size,
#endif
record->heap_use_pages,
record->gc_mark_time*1000,
record->gc_sweep_time*1000,
record->prepare_time*1000,
record->heap_live_objects,
record->heap_free_objects,
record->removing_objects,
record->empty_objects
#if RGENGC_PROFILE
,
record->old_objects,
record->remembered_normal_objects,
record->remembered_shady_objects
#endif
#if GC_PROFILE_DETAIL_MEMORY
,
record->maxrss / 1024,
record->minflt,
record->majflt
#endif
));
}
#endif
}
}
/*
* call-seq:
* GC::Profiler.result -> String
*
* Returns a profile data report such as:
*
* GC 1 invokes.
* Index Invoke Time(sec) Use Size(byte) Total Size(byte) Total Object GC time(ms)
* 1 0.012 159240 212940 10647 0.00000000000001530000
*/
static VALUE
gc_profile_result(VALUE _)
{
VALUE str = rb_str_buf_new(0);
gc_profile_dump_on(str, rb_str_buf_append);
return str;
}
/*
* call-seq:
* GC::Profiler.report
* GC::Profiler.report(io)
*
* Writes the GC::Profiler.result to <tt>$stdout</tt> or the given IO object.
*
*/
static VALUE
gc_profile_report(int argc, VALUE *argv, VALUE self)
{
VALUE out;
out = (!rb_check_arity(argc, 0, 1) ? rb_stdout : argv[0]);
gc_profile_dump_on(out, rb_io_write);
return Qnil;
}
/*
* call-seq:
* GC::Profiler.total_time -> float
*
* The total time used for garbage collection in seconds
*/
static VALUE
gc_profile_total_time(VALUE self)
{
double time = 0;
rb_objspace_t *objspace = &rb_objspace;
if (objspace->profile.run && objspace->profile.next_index > 0) {
size_t i;
size_t count = objspace->profile.next_index;
for (i = 0; i < count; i++) {
time += objspace->profile.records[i].gc_time;
}
}
return DBL2NUM(time);
}
/*
* call-seq:
* GC::Profiler.enabled? -> true or false
*
* The current status of GC profile mode.
*/
static VALUE
gc_profile_enable_get(VALUE self)
{
rb_objspace_t *objspace = &rb_objspace;
return objspace->profile.run ? Qtrue : Qfalse;
}
/*
* call-seq:
* GC::Profiler.enable -> nil
*
* Starts the GC profiler.
*
*/
static VALUE
gc_profile_enable(VALUE _)
{
rb_objspace_t *objspace = &rb_objspace;
objspace->profile.run = TRUE;
objspace->profile.current_record = 0;
return Qnil;
}
/*
* call-seq:
* GC::Profiler.disable -> nil
*
* Stops the GC profiler.
*
*/
static VALUE
gc_profile_disable(VALUE _)
{
rb_objspace_t *objspace = &rb_objspace;
objspace->profile.run = FALSE;
objspace->profile.current_record = 0;
return Qnil;
}
/*
------------------------------ DEBUG ------------------------------
*/
static const char *
type_name(int type, VALUE obj)
{
switch (type) {
#define TYPE_NAME(t) case (t): return #t;
TYPE_NAME(T_NONE);
TYPE_NAME(T_OBJECT);
TYPE_NAME(T_CLASS);
TYPE_NAME(T_MODULE);
TYPE_NAME(T_FLOAT);
TYPE_NAME(T_STRING);
TYPE_NAME(T_REGEXP);
TYPE_NAME(T_ARRAY);
TYPE_NAME(T_HASH);
TYPE_NAME(T_STRUCT);
TYPE_NAME(T_BIGNUM);
TYPE_NAME(T_FILE);
TYPE_NAME(T_MATCH);
TYPE_NAME(T_COMPLEX);
TYPE_NAME(T_RATIONAL);
TYPE_NAME(T_NIL);
TYPE_NAME(T_TRUE);
TYPE_NAME(T_FALSE);
TYPE_NAME(T_SYMBOL);
TYPE_NAME(T_FIXNUM);
TYPE_NAME(T_UNDEF);
TYPE_NAME(T_IMEMO);
TYPE_NAME(T_ICLASS);
TYPE_NAME(T_MOVED);
TYPE_NAME(T_ZOMBIE);
case T_DATA:
if (obj && rb_objspace_data_type_name(obj)) {
return rb_objspace_data_type_name(obj);
}
return "T_DATA";
#undef TYPE_NAME
}
return "unknown";
}
static const char *
obj_type_name(VALUE obj)
{
return type_name(TYPE(obj), obj);
}
static const char *
method_type_name(rb_method_type_t type)
{
switch (type) {
case VM_METHOD_TYPE_ISEQ: return "iseq";
case VM_METHOD_TYPE_ATTRSET: return "attrest";
case VM_METHOD_TYPE_IVAR: return "ivar";
case VM_METHOD_TYPE_BMETHOD: return "bmethod";
case VM_METHOD_TYPE_ALIAS: return "alias";
case VM_METHOD_TYPE_REFINED: return "refined";
case VM_METHOD_TYPE_CFUNC: return "cfunc";
case VM_METHOD_TYPE_ZSUPER: return "zsuper";
case VM_METHOD_TYPE_MISSING: return "missing";
case VM_METHOD_TYPE_OPTIMIZED: return "optimized";
case VM_METHOD_TYPE_UNDEF: return "undef";
case VM_METHOD_TYPE_NOTIMPLEMENTED: return "notimplemented";
}
rb_bug("method_type_name: unreachable (type: %d)", type);
}
/* from array.c */
# define ARY_SHARED_P(ary) \
(GC_ASSERT(!FL_TEST((ary), ELTS_SHARED) || !FL_TEST((ary), RARRAY_EMBED_FLAG)), \
FL_TEST((ary),ELTS_SHARED)!=0)
# define ARY_EMBED_P(ary) \
(GC_ASSERT(!FL_TEST((ary), ELTS_SHARED) || !FL_TEST((ary), RARRAY_EMBED_FLAG)), \
FL_TEST((ary), RARRAY_EMBED_FLAG)!=0)
static void
rb_raw_iseq_info(char *buff, const int buff_size, const rb_iseq_t *iseq)
{
if (buff_size > 0 && iseq->body && iseq->body->location.label && !RB_TYPE_P(iseq->body->location.pathobj, T_MOVED)) {
VALUE path = rb_iseq_path(iseq);
VALUE n = iseq->body->location.first_lineno;
snprintf(buff, buff_size, " %s@%s:%d",
RSTRING_PTR(iseq->body->location.label),
RSTRING_PTR(path),
n ? FIX2INT(n) : 0 );
}
}
const char *
rb_raw_obj_info(char *buff, const int buff_size, VALUE obj)
{
int pos = 0;
#define BUFF_ARGS buff + pos, buff_size - pos
#define APPENDF(f) if ((pos += snprintf f) >= buff_size) goto end
if (SPECIAL_CONST_P(obj)) {
APPENDF((BUFF_ARGS, "%s", obj_type_name(obj)));
if (FIXNUM_P(obj)) {
APPENDF((BUFF_ARGS, " %ld", FIX2LONG(obj)));
}
else if (SYMBOL_P(obj)) {
APPENDF((BUFF_ARGS, " %s", rb_id2name(SYM2ID(obj))));
}
}
else {
#define TF(c) ((c) != 0 ? "true" : "false")
#define C(c, s) ((c) != 0 ? (s) : " ")
const int type = BUILTIN_TYPE(obj);
#if USE_RGENGC
const int age = RVALUE_FLAGS_AGE(RBASIC(obj)->flags);
if (is_pointer_to_heap(&rb_objspace, (void *)obj)) {
APPENDF((BUFF_ARGS, "%p [%d%s%s%s%s%s] %s ",
(void *)obj, age,
C(RVALUE_UNCOLLECTIBLE_BITMAP(obj), "L"),
C(RVALUE_MARK_BITMAP(obj), "M"),
C(RVALUE_PIN_BITMAP(obj), "P"),
C(RVALUE_MARKING_BITMAP(obj), "R"),
C(RVALUE_WB_UNPROTECTED_BITMAP(obj), "U"),
obj_type_name(obj)));
}
else {
/* fake */
APPENDF((BUFF_ARGS, "%p [%dXXXX] %s",
(void *)obj, age,
obj_type_name(obj)));
}
#else
APPENDF((BUFF_ARGS, "%p [%s] %s",
(void *)obj,
C(RVALUE_MARK_BITMAP(obj), "M"),
obj_type_name(obj)));
#endif
if (internal_object_p(obj)) {
/* ignore */
}
else if (RBASIC(obj)->klass == 0) {
APPENDF((BUFF_ARGS, "(temporary internal)"));
}
else {
if (RTEST(RBASIC(obj)->klass)) {
VALUE class_path = rb_class_path_cached(RBASIC(obj)->klass);
if (!NIL_P(class_path)) {
APPENDF((BUFF_ARGS, "(%s)", RSTRING_PTR(class_path)));
}
}
}
#if GC_DEBUG
APPENDF((BUFF_ARGS, "@%s:%d", RANY(obj)->file, RANY(obj)->line));
#endif
switch (type) {
case T_NODE:
UNEXPECTED_NODE(rb_raw_obj_info);
break;
case T_ARRAY:
if (FL_TEST(obj, ELTS_SHARED)) {
APPENDF((BUFF_ARGS, "shared -> %s",
rb_obj_info(RARRAY(obj)->as.heap.aux.shared_root)));
}
else if (FL_TEST(obj, RARRAY_EMBED_FLAG)) {
APPENDF((BUFF_ARGS, "[%s%s] len: %d (embed)",
C(ARY_EMBED_P(obj), "E"),
C(ARY_SHARED_P(obj), "S"),
(int)RARRAY_LEN(obj)));
}
else {
APPENDF((BUFF_ARGS, "[%s%s%s] len: %d, capa:%d ptr:%p",
C(ARY_EMBED_P(obj), "E"),
C(ARY_SHARED_P(obj), "S"),
C(RARRAY_TRANSIENT_P(obj), "T"),
(int)RARRAY_LEN(obj),
ARY_EMBED_P(obj) ? -1 : (int)RARRAY(obj)->as.heap.aux.capa,
(void *)RARRAY_CONST_PTR_TRANSIENT(obj)));
}
break;
case T_STRING: {
APPENDF((BUFF_ARGS, "%s", RSTRING_PTR(obj)));
break;
}
case T_MOVED: {
APPENDF((BUFF_ARGS, "-> %p", (void*)rb_gc_location(obj)));
break;
}
case T_HASH: {
APPENDF((BUFF_ARGS, "[%c%c] %d",
RHASH_AR_TABLE_P(obj) ? 'A' : 'S',
RHASH_TRANSIENT_P(obj) ? 'T' : ' ',
(int)RHASH_SIZE(obj)));
break;
}
case T_CLASS:
case T_MODULE:
{
VALUE class_path = rb_class_path_cached(obj);
if (!NIL_P(class_path)) {
APPENDF((BUFF_ARGS, "%s", RSTRING_PTR(class_path)));
}
break;
}
case T_ICLASS:
{
VALUE class_path = rb_class_path_cached(RBASIC_CLASS(obj));
if (!NIL_P(class_path)) {
APPENDF((BUFF_ARGS, "src:%s", RSTRING_PTR(class_path)));
}
break;
}
case T_OBJECT:
{
uint32_t len = ROBJECT_NUMIV(obj);
if (RANY(obj)->as.basic.flags & ROBJECT_EMBED) {
APPENDF((BUFF_ARGS, "(embed) len:%d", len));
}
else {
VALUE *ptr = ROBJECT_IVPTR(obj);
APPENDF((BUFF_ARGS, "len:%d ptr:%p", len, (void *)ptr));
}
}
break;
case T_DATA: {
const struct rb_block *block;
const rb_iseq_t *iseq;
if (rb_obj_is_proc(obj) &&
(block = vm_proc_block(obj)) != NULL &&
(vm_block_type(block) == block_type_iseq) &&
(iseq = vm_block_iseq(block)) != NULL) {
rb_raw_iseq_info(BUFF_ARGS, iseq);
}
else {
const char * const type_name = rb_objspace_data_type_name(obj);
if (type_name) {
APPENDF((BUFF_ARGS, "%s", type_name));
}
}
break;
}
case T_IMEMO: {
const char *imemo_name = "\0";
switch (imemo_type(obj)) {
#define IMEMO_NAME(x) case imemo_##x: imemo_name = #x; break;
IMEMO_NAME(env);
IMEMO_NAME(cref);
IMEMO_NAME(svar);
IMEMO_NAME(throw_data);
IMEMO_NAME(ifunc);
IMEMO_NAME(memo);
IMEMO_NAME(ment);
IMEMO_NAME(iseq);
IMEMO_NAME(tmpbuf);
IMEMO_NAME(ast);
IMEMO_NAME(parser_strterm);
#undef IMEMO_NAME
default: UNREACHABLE;
}
APPENDF((BUFF_ARGS, "/%s", imemo_name));
switch (imemo_type(obj)) {
case imemo_ment: {
const rb_method_entry_t *me = &RANY(obj)->as.imemo.ment;
if (me->def) {
APPENDF((BUFF_ARGS, "(called_id: %s, type: %s, alias: %d, owner: %s, defined_class: %s)",
rb_id2name(me->called_id),
method_type_name(me->def->type),
me->def->alias_count,
obj_info(me->owner),
obj_info(me->defined_class)));
}
else {
APPENDF((BUFF_ARGS, "%s", rb_id2name(me->called_id)));
}
break;
}
case imemo_iseq: {
const rb_iseq_t *iseq = (const rb_iseq_t *)obj;
rb_raw_iseq_info(BUFF_ARGS, iseq);
break;
}
default:
break;
}
}
default:
break;
}
#undef TF
#undef C
}
end:
return buff;
#undef APPENDF
#undef BUFF_ARGS
}
#if RGENGC_OBJ_INFO
#define OBJ_INFO_BUFFERS_NUM 10
#define OBJ_INFO_BUFFERS_SIZE 0x100
static int obj_info_buffers_index = 0;
static char obj_info_buffers[OBJ_INFO_BUFFERS_NUM][OBJ_INFO_BUFFERS_SIZE];
static const char *
obj_info(VALUE obj)
{
const int index = obj_info_buffers_index++;
char *const buff = &obj_info_buffers[index][0];
if (obj_info_buffers_index >= OBJ_INFO_BUFFERS_NUM) {
obj_info_buffers_index = 0;
}
return rb_raw_obj_info(buff, OBJ_INFO_BUFFERS_SIZE, obj);
}
#else
static const char *
obj_info(VALUE obj)
{
return obj_type_name(obj);
}
#endif
MJIT_FUNC_EXPORTED const char *
rb_obj_info(VALUE obj)
{
return obj_info(obj);
}
void
rb_obj_info_dump(VALUE obj)
{
char buff[0x100];
fprintf(stderr, "rb_obj_info_dump: %s\n", rb_raw_obj_info(buff, 0x100, obj));
}
void
rb_obj_info_dump_loc(VALUE obj, const char *file, int line, const char *func)
{
char buff[0x100];
fprintf(stderr, "<OBJ_INFO:%s@%s:%d> %s\n", func, file, line, rb_raw_obj_info(buff, 0x100, obj));
}
#if GC_DEBUG
void
rb_gcdebug_print_obj_condition(VALUE obj)
{
rb_objspace_t *objspace = &rb_objspace;
fprintf(stderr, "created at: %s:%d\n", RANY(obj)->file, RANY(obj)->line);
if (BUILTIN_TYPE(obj) == T_MOVED) {
fprintf(stderr, "moved?: true\n");
}
else {
fprintf(stderr, "moved?: false\n");
}
if (is_pointer_to_heap(objspace, (void *)obj)) {
fprintf(stderr, "pointer to heap?: true\n");
}
else {
fprintf(stderr, "pointer to heap?: false\n");
return;
}
fprintf(stderr, "marked? : %s\n", MARKED_IN_BITMAP(GET_HEAP_MARK_BITS(obj), obj) ? "true" : "false");
fprintf(stderr, "pinned? : %s\n", MARKED_IN_BITMAP(GET_HEAP_PINNED_BITS(obj), obj) ? "true" : "false");
#if USE_RGENGC
fprintf(stderr, "age? : %d\n", RVALUE_AGE(obj));
fprintf(stderr, "old? : %s\n", RVALUE_OLD_P(obj) ? "true" : "false");
fprintf(stderr, "WB-protected?: %s\n", RVALUE_WB_UNPROTECTED(obj) ? "false" : "true");
fprintf(stderr, "remembered? : %s\n", RVALUE_REMEMBERED(obj) ? "true" : "false");
#endif
if (is_lazy_sweeping(heap_eden)) {
fprintf(stderr, "lazy sweeping?: true\n");
fprintf(stderr, "swept?: %s\n", is_swept_object(objspace, obj) ? "done" : "not yet");
}
else {
fprintf(stderr, "lazy sweeping?: false\n");
}
}
static VALUE
gcdebug_sentinel(VALUE obj, VALUE name)
{
fprintf(stderr, "WARNING: object %s(%p) is inadvertently collected\n", (char *)name, (void *)obj);
return Qnil;
}
void
rb_gcdebug_sentinel(VALUE obj, const char *name)
{
rb_define_finalizer(obj, rb_proc_new(gcdebug_sentinel, (VALUE)name));
}
#endif /* GC_DEBUG */
#if GC_DEBUG_STRESS_TO_CLASS
/*
* call-seq:
* GC.add_stress_to_class(class[, ...])
*
* Raises NoMemoryError when allocating an instance of the given classes.
*
*/
static VALUE
rb_gcdebug_add_stress_to_class(int argc, VALUE *argv, VALUE self)
{
rb_objspace_t *objspace = &rb_objspace;
if (!stress_to_class) {
stress_to_class = rb_ary_tmp_new(argc);
}
rb_ary_cat(stress_to_class, argv, argc);
return self;
}
/*
* call-seq:
* GC.remove_stress_to_class(class[, ...])
*
* No longer raises NoMemoryError when allocating an instance of the
* given classes.
*
*/
static VALUE
rb_gcdebug_remove_stress_to_class(int argc, VALUE *argv, VALUE self)
{
rb_objspace_t *objspace = &rb_objspace;
int i;
if (stress_to_class) {
for (i = 0; i < argc; ++i) {
rb_ary_delete_same(stress_to_class, argv[i]);
}
if (RARRAY_LEN(stress_to_class) == 0) {
stress_to_class = 0;
}
}
return Qnil;
}
#endif
/*
* Document-module: ObjectSpace
*
* The ObjectSpace module contains a number of routines
* that interact with the garbage collection facility and allow you to
* traverse all living objects with an iterator.
*
* ObjectSpace also provides support for object finalizers, procs that will be
* called when a specific object is about to be destroyed by garbage
* collection.
*
* require 'objspace'
*
* a = "A"
* b = "B"
*
* ObjectSpace.define_finalizer(a, proc {|id| puts "Finalizer one on #{id}" })
* ObjectSpace.define_finalizer(b, proc {|id| puts "Finalizer two on #{id}" })
*
* _produces:_
*
* Finalizer two on 537763470
* Finalizer one on 537763480
*/
/*
* Document-class: ObjectSpace::WeakMap
*
* An ObjectSpace::WeakMap object holds references to
* any objects, but those objects can get garbage collected.
*
* This class is mostly used internally by WeakRef, please use
* +lib/weakref.rb+ for the public interface.
*/
/* Document-class: GC::Profiler
*
* The GC profiler provides access to information on GC runs including time,
* length and object space size.
*
* Example:
*
* GC::Profiler.enable
*
* require 'rdoc/rdoc'
*
* GC::Profiler.report
*
* GC::Profiler.disable
*
* See also GC.count, GC.malloc_allocated_size and GC.malloc_allocations
*/
#include "gc.rbinc"
void
Init_GC(void)
{
#undef rb_intern
VALUE rb_mObjSpace;
VALUE rb_mProfiler;
VALUE gc_constants;
rb_mGC = rb_define_module("GC");
load_gc();
gc_constants = rb_hash_new();
rb_hash_aset(gc_constants, ID2SYM(rb_intern("RVALUE_SIZE")), SIZET2NUM(sizeof(RVALUE)));
rb_hash_aset(gc_constants, ID2SYM(rb_intern("HEAP_PAGE_OBJ_LIMIT")), SIZET2NUM(HEAP_PAGE_OBJ_LIMIT));
rb_hash_aset(gc_constants, ID2SYM(rb_intern("HEAP_PAGE_BITMAP_SIZE")), SIZET2NUM(HEAP_PAGE_BITMAP_SIZE));
rb_hash_aset(gc_constants, ID2SYM(rb_intern("HEAP_PAGE_BITMAP_PLANES")), SIZET2NUM(HEAP_PAGE_BITMAP_PLANES));
OBJ_FREEZE(gc_constants);
/* internal constants */
rb_define_const(rb_mGC, "INTERNAL_CONSTANTS", gc_constants);
rb_mProfiler = rb_define_module_under(rb_mGC, "Profiler");
rb_define_singleton_method(rb_mProfiler, "enabled?", gc_profile_enable_get, 0);
rb_define_singleton_method(rb_mProfiler, "enable", gc_profile_enable, 0);
rb_define_singleton_method(rb_mProfiler, "raw_data", gc_profile_record_get, 0);
rb_define_singleton_method(rb_mProfiler, "disable", gc_profile_disable, 0);
rb_define_singleton_method(rb_mProfiler, "clear", gc_profile_clear, 0);
rb_define_singleton_method(rb_mProfiler, "result", gc_profile_result, 0);
rb_define_singleton_method(rb_mProfiler, "report", gc_profile_report, -1);
rb_define_singleton_method(rb_mProfiler, "total_time", gc_profile_total_time, 0);
rb_mObjSpace = rb_define_module("ObjectSpace");
rb_define_module_function(rb_mObjSpace, "each_object", os_each_obj, -1);
rb_define_module_function(rb_mObjSpace, "define_finalizer", define_final, -1);
rb_define_module_function(rb_mObjSpace, "undefine_finalizer", undefine_final, 1);
rb_define_module_function(rb_mObjSpace, "_id2ref", os_id2ref, 1);
rb_vm_register_special_exception(ruby_error_nomemory, rb_eNoMemError, "failed to allocate memory");
rb_define_method(rb_cBasicObject, "__id__", rb_obj_id, 0);
rb_define_method(rb_mKernel, "object_id", rb_obj_id, 0);
rb_define_module_function(rb_mObjSpace, "count_objects", count_objects, -1);
{
VALUE rb_cWeakMap = rb_define_class_under(rb_mObjSpace, "WeakMap", rb_cObject);
rb_define_alloc_func(rb_cWeakMap, wmap_allocate);
rb_define_method(rb_cWeakMap, "[]=", wmap_aset, 2);
rb_define_method(rb_cWeakMap, "[]", wmap_aref, 1);
rb_define_method(rb_cWeakMap, "include?", wmap_has_key, 1);
rb_define_method(rb_cWeakMap, "member?", wmap_has_key, 1);
rb_define_method(rb_cWeakMap, "key?", wmap_has_key, 1);
rb_define_method(rb_cWeakMap, "inspect", wmap_inspect, 0);
rb_define_method(rb_cWeakMap, "each", wmap_each, 0);
rb_define_method(rb_cWeakMap, "each_pair", wmap_each, 0);
rb_define_method(rb_cWeakMap, "each_key", wmap_each_key, 0);
rb_define_method(rb_cWeakMap, "each_value", wmap_each_value, 0);
rb_define_method(rb_cWeakMap, "keys", wmap_keys, 0);
rb_define_method(rb_cWeakMap, "values", wmap_values, 0);
rb_define_method(rb_cWeakMap, "size", wmap_size, 0);
rb_define_method(rb_cWeakMap, "length", wmap_size, 0);
rb_include_module(rb_cWeakMap, rb_mEnumerable);
}
/* internal methods */
rb_define_singleton_method(rb_mGC, "verify_internal_consistency", gc_verify_internal_consistency_m, 0);
rb_define_singleton_method(rb_mGC, "verify_compaction_references", gc_verify_compaction_references, -1);
rb_define_singleton_method(rb_mGC, "verify_transient_heap_internal_consistency", gc_verify_transient_heap_internal_consistency, 0);
#if MALLOC_ALLOCATED_SIZE
rb_define_singleton_method(rb_mGC, "malloc_allocated_size", gc_malloc_allocated_size, 0);
rb_define_singleton_method(rb_mGC, "malloc_allocations", gc_malloc_allocations, 0);
#endif
#if GC_DEBUG_STRESS_TO_CLASS
rb_define_singleton_method(rb_mGC, "add_stress_to_class", rb_gcdebug_add_stress_to_class, -1);
rb_define_singleton_method(rb_mGC, "remove_stress_to_class", rb_gcdebug_remove_stress_to_class, -1);
#endif
{
VALUE opts;
/* GC build options */
rb_define_const(rb_mGC, "OPTS", opts = rb_ary_new());
#define OPT(o) if (o) rb_ary_push(opts, rb_fstring_lit(#o))
OPT(GC_DEBUG);
OPT(USE_RGENGC);
OPT(RGENGC_DEBUG);
OPT(RGENGC_CHECK_MODE);
OPT(RGENGC_PROFILE);
OPT(RGENGC_ESTIMATE_OLDMALLOC);
OPT(GC_PROFILE_MORE_DETAIL);
OPT(GC_ENABLE_LAZY_SWEEP);
OPT(CALC_EXACT_MALLOC_SIZE);
OPT(MALLOC_ALLOCATED_SIZE);
OPT(MALLOC_ALLOCATED_SIZE_CHECK);
OPT(GC_PROFILE_DETAIL_MEMORY);
#undef OPT
OBJ_FREEZE(opts);
}
}
#ifdef ruby_xmalloc
#undef ruby_xmalloc
#endif
#ifdef ruby_xmalloc2
#undef ruby_xmalloc2
#endif
#ifdef ruby_xcalloc
#undef ruby_xcalloc
#endif
#ifdef ruby_xrealloc
#undef ruby_xrealloc
#endif
#ifdef ruby_xrealloc2
#undef ruby_xrealloc2
#endif
void *
ruby_xmalloc(size_t size)
{
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
ruby_malloc_info_file = __FILE__;
ruby_malloc_info_line = __LINE__;
#endif
return ruby_xmalloc_body(size);
}
void *
ruby_xmalloc2(size_t n, size_t size)
{
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
ruby_malloc_info_file = __FILE__;
ruby_malloc_info_line = __LINE__;
#endif
return ruby_xmalloc2_body(n, size);
}
void *
ruby_xcalloc(size_t n, size_t size)
{
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
ruby_malloc_info_file = __FILE__;
ruby_malloc_info_line = __LINE__;
#endif
return ruby_xcalloc_body(n, size);
}
void *
ruby_xrealloc(void *ptr, size_t new_size)
{
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
ruby_malloc_info_file = __FILE__;
ruby_malloc_info_line = __LINE__;
#endif
return ruby_xrealloc_body(ptr, new_size);
}
void *
ruby_xrealloc2(void *ptr, size_t n, size_t new_size)
{
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
ruby_malloc_info_file = __FILE__;
ruby_malloc_info_line = __LINE__;
#endif
return ruby_xrealloc2_body(ptr, n, new_size);
}
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