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ruby--ruby/mjit_worker.c
Takashi Kokubun cc6afff006
Avoid infinite times of JIT compaction 
It's to avoid memory leak for actual usage (because they don't get
unloaded properly), but also for fixing CI timed out due to JIT
compaction taking too long time on --jit-wait (which runs every time)
http://ci.rvm.jp/results/trunk-mjit-wait@silicon-docker/2911601
2020-05-02 21:43:28 -07:00

1374 lines
48 KiB
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/**********************************************************************
mjit_worker.c - Worker for MRI method JIT compiler
Copyright (C) 2017 Vladimir Makarov <vmakarov@redhat.com>.
**********************************************************************/
// NOTE: All functions in this file are executed on MJIT worker. So don't
// call Ruby methods (C functions that may call rb_funcall) or trigger
// GC (using ZALLOC, xmalloc, xfree, etc.) in this file.
/* However, note that calling `free` for resources `xmalloc`-ed in mjit.c,
which is currently done in some places, is sometimes problematic in the
following situations:
* malloc library could be different between interpreter and extensions
on Windows (perhaps not applicable to MJIT because CC is the same)
* xmalloc -> free leaks extra space used for USE_GC_MALLOC_OBJ_INFO_DETAILS
(not enabled by default)
...in short, it's usually not a problem in MJIT. But maybe it's worth
fixing for consistency or for USE_GC_MALLOC_OBJ_INFO_DETAILS support.
*/
/* We utilize widely used C compilers (GCC and LLVM Clang) to
implement MJIT. We feed them a C code generated from ISEQ. The
industrial C compilers are slower than regular JIT engines.
Generated code performance of the used C compilers has a higher
priority over the compilation speed.
So our major goal is to minimize the ISEQ compilation time when we
use widely optimization level (-O2). It is achieved by
o Using a precompiled version of the header
o Keeping all files in `/tmp`. On modern Linux `/tmp` is a file
system in memory. So it is pretty fast
o Implementing MJIT as a multi-threaded code because we want to
compile ISEQs in parallel with iseq execution to speed up Ruby
code execution. MJIT has one thread (*worker*) to do
parallel compilations:
o It prepares a precompiled code of the minimized header.
It starts at the MRI execution start
o It generates PIC object files of ISEQs
o It takes one JIT unit from a priority queue unless it is empty.
o It translates the JIT unit ISEQ into C-code using the precompiled
header, calls CC and load PIC code when it is ready
o Currently MJIT put ISEQ in the queue when ISEQ is called
o MJIT can reorder ISEQs in the queue if some ISEQ has been called
many times and its compilation did not start yet
o MRI reuses the machine code if it already exists for ISEQ
o The machine code we generate can stop and switch to the ISEQ
interpretation if some condition is not satisfied as the machine
code can be speculative or some exception raises
o Speculative machine code can be canceled.
Here is a diagram showing the MJIT organization:
_______
|header |
|_______|
| MRI building
--------------|----------------------------------------
| MRI execution
|
_____________|_____
| | |
| ___V__ | CC ____________________
| | |----------->| precompiled header |
| | | | |____________________|
| | | | |
| | MJIT | | |
| | | | |
| | | | ____V___ CC __________
| |______|----------->| C code |--->| .so file |
| | |________| |__________|
| | |
| | |
| MRI machine code |<-----------------------------
|___________________| loading
*/
#ifdef __sun
#define __EXTENSIONS__ 1
#endif
#include "vm_core.h"
#include "vm_callinfo.h"
#include "mjit.h"
#include "gc.h"
#include "ruby_assert.h"
#include "ruby/debug.h"
#include "ruby/thread.h"
#include "ruby/version.h"
#ifdef _WIN32
#include <winsock2.h>
#include <windows.h>
#else
#include <sys/wait.h>
#include <sys/time.h>
#include <dlfcn.h>
#endif
#include <errno.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#include "dln.h"
#include "ruby/util.h"
#undef strdup // ruby_strdup may trigger GC
#ifndef MAXPATHLEN
# define MAXPATHLEN 1024
#endif
#ifdef _WIN32
#define dlopen(name,flag) ((void*)LoadLibrary(name))
#define dlerror() strerror(rb_w32_map_errno(GetLastError()))
#define dlsym(handle,name) ((void*)GetProcAddress((handle),(name)))
#define dlclose(handle) (!FreeLibrary(handle))
#define RTLD_NOW -1
#define waitpid(pid,stat_loc,options) (WaitForSingleObject((HANDLE)(pid), INFINITE), GetExitCodeProcess((HANDLE)(pid), (LPDWORD)(stat_loc)), CloseHandle((HANDLE)pid), (pid))
#define WIFEXITED(S) ((S) != STILL_ACTIVE)
#define WEXITSTATUS(S) (S)
#define WIFSIGNALED(S) (0)
typedef intptr_t pid_t;
#endif
// Atomically set function pointer if possible.
#define MJIT_ATOMIC_SET(var, val) (void)ATOMIC_PTR_EXCHANGE(var, val)
#define MJIT_TMP_PREFIX "_ruby_mjit_"
// The unit structure that holds metadata of ISeq for MJIT.
struct rb_mjit_unit {
// Unique order number of unit.
int id;
// Dlopen handle of the loaded object file.
void *handle;
rb_iseq_t *iseq;
#ifndef _MSC_VER
// This value is always set for `compact_all_jit_code`. Also used for lazy deletion.
char *c_file;
// true if it's inherited from parent Ruby process and lazy deletion should be skipped.
// `c_file = NULL` can't be used to skip lazy deletion because `c_file` could be used
// by child for `compact_all_jit_code`.
bool c_file_inherited_p;
#endif
#if defined(_WIN32)
// DLL cannot be removed while loaded on Windows. If this is set, it'll be lazily deleted.
char *so_file;
#endif
// Only used by unload_units. Flag to check this unit is currently on stack or not.
char used_code_p;
struct list_node unode;
// mjit_compile's optimization switches
struct rb_mjit_compile_info compile_info;
// captured CC values, they should be marked with iseq.
const struct rb_callcache **cc_entries;
unsigned int cc_entries_size; // iseq->body->ci_size + ones of inlined iseqs
};
// Linked list of struct rb_mjit_unit.
struct rb_mjit_unit_list {
struct list_head head;
int length; // the list length
};
extern void rb_native_mutex_lock(rb_nativethread_lock_t *lock);
extern void rb_native_mutex_unlock(rb_nativethread_lock_t *lock);
extern void rb_native_mutex_initialize(rb_nativethread_lock_t *lock);
extern void rb_native_mutex_destroy(rb_nativethread_lock_t *lock);
extern void rb_native_cond_initialize(rb_nativethread_cond_t *cond);
extern void rb_native_cond_destroy(rb_nativethread_cond_t *cond);
extern void rb_native_cond_signal(rb_nativethread_cond_t *cond);
extern void rb_native_cond_broadcast(rb_nativethread_cond_t *cond);
extern void rb_native_cond_wait(rb_nativethread_cond_t *cond, rb_nativethread_lock_t *mutex);
// process.c
extern rb_pid_t ruby_waitpid_locked(rb_vm_t *, rb_pid_t, int *status, int options, rb_nativethread_cond_t *cond);
// A copy of MJIT portion of MRI options since MJIT initialization. We
// need them as MJIT threads still can work when the most MRI data were
// freed.
struct mjit_options mjit_opts;
// true if MJIT is enabled.
bool mjit_enabled = false;
// true if JIT-ed code should be called. When `ruby_vm_event_enabled_global_flags & ISEQ_TRACE_EVENTS`
// and `mjit_call_p == false`, any JIT-ed code execution is cancelled as soon as possible.
bool mjit_call_p = false;
// Priority queue of iseqs waiting for JIT compilation.
// This variable is a pointer to head unit of the queue.
static struct rb_mjit_unit_list unit_queue = { LIST_HEAD_INIT(unit_queue.head) };
// List of units which are successfully compiled.
static struct rb_mjit_unit_list active_units = { LIST_HEAD_INIT(active_units.head) };
// List of compacted so files which will be cleaned up by `free_list()` in `mjit_finish()`.
static struct rb_mjit_unit_list compact_units = { LIST_HEAD_INIT(compact_units.head) };
// List of units before recompilation and just waiting for dlclose().
static struct rb_mjit_unit_list stale_units = { LIST_HEAD_INIT(stale_units.head) };
// The number of so far processed ISEQs, used to generate unique id.
static int current_unit_num;
// A mutex for conitionals and critical sections.
static rb_nativethread_lock_t mjit_engine_mutex;
// A thread conditional to wake up `mjit_finish` at the end of PCH thread.
static rb_nativethread_cond_t mjit_pch_wakeup;
// A thread conditional to wake up the client if there is a change in
// executed unit status.
static rb_nativethread_cond_t mjit_client_wakeup;
// A thread conditional to wake up a worker if there we have something
// to add or we need to stop MJIT engine.
static rb_nativethread_cond_t mjit_worker_wakeup;
// A thread conditional to wake up workers if at the end of GC.
static rb_nativethread_cond_t mjit_gc_wakeup;
// True when GC is working.
static bool in_gc = false;
// True when JIT is working.
static bool in_jit = false;
// True when JIT compaction is running.
static bool in_compact = false;
// Set to true to stop worker.
static bool stop_worker_p;
// Set to true if worker is stopped.
static bool worker_stopped;
// Path of "/tmp", which can be changed to $TMP in MinGW.
static char *tmp_dir;
// Hash like { 1 => true, 2 => true, ... } whose keys are valid `class_serial`s.
// This is used to invalidate obsoleted CALL_CACHE.
static VALUE valid_class_serials;
// Used C compiler path.
static const char *cc_path;
// Used C compiler flags.
static const char **cc_common_args;
// Used C compiler flags added by --jit-debug=...
static char **cc_added_args;
// Name of the precompiled header file.
static char *pch_file;
// The process id which should delete the pch_file on mjit_finish.
static rb_pid_t pch_owner_pid;
// Status of the precompiled header creation. The status is
// shared by the workers and the pch thread.
static enum {PCH_NOT_READY, PCH_FAILED, PCH_SUCCESS} pch_status;
#ifndef _MSC_VER
// Name of the header file.
static char *header_file;
#endif
#ifdef _WIN32
// Linker option to enable libruby.
static char *libruby_pathflag;
#endif
#include "mjit_config.h"
#if defined(__GNUC__) && \
(!defined(__clang__) || \
(defined(__clang__) && (defined(__FreeBSD__) || defined(__GLIBC__))))
# define GCC_PIC_FLAGS "-Wfatal-errors", "-fPIC", "-shared", "-w", "-pipe",
# define MJIT_CFLAGS_PIPE 1
#else
# define GCC_PIC_FLAGS /* empty */
# define MJIT_CFLAGS_PIPE 0
#endif
// Use `-nodefaultlibs -nostdlib` for GCC where possible, which does not work on mingw, cygwin, AIX, and OpenBSD.
// This seems to improve MJIT performance on GCC.
#if defined __GNUC__ && !defined __clang__ && !defined(_WIN32) && !defined(__CYGWIN__) && !defined(_AIX) && !defined(__OpenBSD__)
# define GCC_NOSTDLIB_FLAGS "-nodefaultlibs", "-nostdlib",
#else
# define GCC_NOSTDLIB_FLAGS // empty
#endif
static const char *const CC_COMMON_ARGS[] = {
MJIT_CC_COMMON MJIT_CFLAGS GCC_PIC_FLAGS
NULL
};
static const char *const CC_DEBUG_ARGS[] = {MJIT_DEBUGFLAGS NULL};
static const char *const CC_OPTIMIZE_ARGS[] = {MJIT_OPTFLAGS NULL};
static const char *const CC_LDSHARED_ARGS[] = {MJIT_LDSHARED GCC_PIC_FLAGS NULL};
static const char *const CC_DLDFLAGS_ARGS[] = {MJIT_DLDFLAGS NULL};
// `CC_LINKER_ARGS` are linker flags which must be passed to `-c` as well.
static const char *const CC_LINKER_ARGS[] = {
#if defined __GNUC__ && !defined __clang__ && !defined(__OpenBSD__)
"-nostartfiles",
#endif
GCC_NOSTDLIB_FLAGS NULL
};
static const char *const CC_LIBS[] = {
#if defined(_WIN32) || defined(__CYGWIN__)
MJIT_LIBS // mswin, mingw, cygwin
#endif
#if defined __GNUC__ && !defined __clang__
# if defined(_WIN32)
"-lmsvcrt", // mingw
# endif
"-lgcc", // mingw, cygwin, and GCC platforms using `-nodefaultlibs -nostdlib`
#endif
#if defined __ANDROID__
"-lm", // to avoid 'cannot locate symbol "modf" referenced by .../_ruby_mjit_XXX.so"'
#endif
NULL
};
#define CC_CODEFLAG_ARGS (mjit_opts.debug ? CC_DEBUG_ARGS : CC_OPTIMIZE_ARGS)
// Print the arguments according to FORMAT to stderr only if MJIT
// verbose option value is more or equal to LEVEL.
PRINTF_ARGS(static void, 2, 3)
verbose(int level, const char *format, ...)
{
if (mjit_opts.verbose >= level) {
va_list args;
size_t len = strlen(format);
char *full_format = alloca(sizeof(char) * (len + 2));
// Creating `format + '\n'` to atomically print format and '\n'.
memcpy(full_format, format, len);
full_format[len] = '\n';
full_format[len+1] = '\0';
va_start(args, format);
vfprintf(stderr, full_format, args);
va_end(args);
}
}
PRINTF_ARGS(static void, 1, 2)
mjit_warning(const char *format, ...)
{
if (mjit_opts.warnings || mjit_opts.verbose) {
va_list args;
fprintf(stderr, "MJIT warning: ");
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fprintf(stderr, "\n");
}
}
// Add unit node to the tail of doubly linked `list`. It should be not in
// the list before.
static void
add_to_list(struct rb_mjit_unit *unit, struct rb_mjit_unit_list *list)
{
(void)RB_DEBUG_COUNTER_INC_IF(mjit_length_unit_queue, list == &unit_queue);
(void)RB_DEBUG_COUNTER_INC_IF(mjit_length_active_units, list == &active_units);
(void)RB_DEBUG_COUNTER_INC_IF(mjit_length_compact_units, list == &compact_units);
(void)RB_DEBUG_COUNTER_INC_IF(mjit_length_stale_units, list == &stale_units);
list_add_tail(&list->head, &unit->unode);
list->length++;
}
static void
remove_from_list(struct rb_mjit_unit *unit, struct rb_mjit_unit_list *list)
{
#if USE_DEBUG_COUNTER
rb_debug_counter_add(RB_DEBUG_COUNTER_mjit_length_unit_queue, -1, list == &unit_queue);
rb_debug_counter_add(RB_DEBUG_COUNTER_mjit_length_active_units, -1, list == &active_units);
rb_debug_counter_add(RB_DEBUG_COUNTER_mjit_length_compact_units, -1, list == &compact_units);
rb_debug_counter_add(RB_DEBUG_COUNTER_mjit_length_stale_units, -1, list == &stale_units);
#endif
list_del(&unit->unode);
list->length--;
}
static void
remove_file(const char *filename)
{
if (remove(filename)) {
mjit_warning("failed to remove \"%s\": %s", filename, strerror(errno));
}
}
// Lazily delete .c and/or .so files.
static void
clean_temp_files(struct rb_mjit_unit *unit)
{
#ifndef _MSC_VER
if (unit->c_file) {
char *c_file = unit->c_file;
unit->c_file = NULL;
// For compaction, unit->c_file is always set when compilation succeeds.
// So save_temps needs to be checked here.
if (!mjit_opts.save_temps && !unit->c_file_inherited_p)
remove_file(c_file);
free(c_file);
}
#endif
#if defined(_WIN32)
if (unit->so_file) {
char *so_file = unit->so_file;
unit->so_file = NULL;
// unit->so_file is set only when mjit_opts.save_temps is false.
remove_file(so_file);
free(so_file);
}
#endif
}
// This is called in the following situations:
// 1) On dequeue or `unload_units()`, associated ISeq is already GCed.
// 2) The unit is not called often and unloaded by `unload_units()`.
// 3) Freeing lists on `mjit_finish()`.
//
// `jit_func` value does not matter for 1 and 3 since the unit won't be used anymore.
// For the situation 2, this sets the ISeq's JIT state to NOT_COMPILED_JIT_ISEQ_FUNC
// to prevent the situation that the same methods are continuously compiled.
static void
free_unit(struct rb_mjit_unit *unit)
{
if (unit->iseq) { // ISeq is not GCed
unit->iseq->body->jit_func = (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC;
unit->iseq->body->jit_unit = NULL;
}
if (unit->cc_entries) {
void *entries = (void *)unit->cc_entries;
free(entries);
}
if (unit->handle && dlclose(unit->handle)) { // handle is NULL if it's in queue
mjit_warning("failed to close handle for u%d: %s", unit->id, dlerror());
}
clean_temp_files(unit);
free(unit);
}
// Start a critical section. Use message `msg` to print debug info at `level`.
static inline void
CRITICAL_SECTION_START(int level, const char *msg)
{
verbose(level, "Locking %s", msg);
rb_native_mutex_lock(&mjit_engine_mutex);
verbose(level, "Locked %s", msg);
}
// Finish the current critical section. Use message `msg` to print
// debug info at `level`.
static inline void
CRITICAL_SECTION_FINISH(int level, const char *msg)
{
verbose(level, "Unlocked %s", msg);
rb_native_mutex_unlock(&mjit_engine_mutex);
}
static int
sprint_uniq_filename(char *str, size_t size, unsigned long id, const char *prefix, const char *suffix)
{
return snprintf(str, size, "%s/%sp%"PRI_PIDT_PREFIX"uu%lu%s", tmp_dir, prefix, getpid(), id, suffix);
}
// Return time in milliseconds as a double.
#ifdef __APPLE__
double ruby_real_ms_time(void);
# define real_ms_time() ruby_real_ms_time()
#else
static double
real_ms_time(void)
{
# ifdef HAVE_CLOCK_GETTIME
struct timespec tv;
# ifdef CLOCK_MONOTONIC
const clockid_t c = CLOCK_MONOTONIC;
# else
const clockid_t c = CLOCK_REALTIME;
# endif
clock_gettime(c, &tv);
return tv.tv_nsec / 1000000.0 + tv.tv_sec * 1000.0;
# else
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_usec / 1000.0 + tv.tv_sec * 1000.0;
# endif
}
#endif
// Return true if class_serial is not obsoleted. This is used by mjit_compile.c.
bool
mjit_valid_class_serial_p(rb_serial_t class_serial)
{
CRITICAL_SECTION_START(3, "in valid_class_serial_p");
bool found_p = rb_hash_stlike_lookup(valid_class_serials, LONG2FIX(class_serial), NULL);
CRITICAL_SECTION_FINISH(3, "in valid_class_serial_p");
return found_p;
}
// Return the best unit from list. The best is the first
// high priority unit or the unit whose iseq has the biggest number
// of calls so far.
static struct rb_mjit_unit *
get_from_list(struct rb_mjit_unit_list *list)
{
struct rb_mjit_unit *unit = NULL, *next, *best = NULL;
// Find iseq with max total_calls
list_for_each_safe(&list->head, unit, next, unode) {
if (unit->iseq == NULL) { // ISeq is GCed.
remove_from_list(unit, list);
free_unit(unit);
continue;
}
if (best == NULL || best->iseq->body->total_calls < unit->iseq->body->total_calls) {
best = unit;
}
}
if (best) {
remove_from_list(best, list);
}
return best;
}
// Return length of NULL-terminated array `args` excluding the NULL marker.
static size_t
args_len(char *const *args)
{
size_t i;
for (i = 0; (args[i]) != NULL;i++)
;
return i;
}
// Concatenate `num` passed NULL-terminated arrays of strings, put the
// result (with NULL end marker) into the heap, and return the result.
static char **
form_args(int num, ...)
{
va_list argp;
size_t len, n;
int i;
char **args, **res, **tmp;
va_start(argp, num);
res = NULL;
for (i = len = 0; i < num; i++) {
args = va_arg(argp, char **);
n = args_len(args);
if ((tmp = (char **)realloc(res, sizeof(char *) * (len + n + 1))) == NULL) {
free(res);
res = NULL;
break;
}
res = tmp;
MEMCPY(res + len, args, char *, n + 1);
len += n;
}
va_end(argp);
return res;
}
COMPILER_WARNING_PUSH
#if __has_warning("-Wdeprecated-declarations") || RUBY3_COMPILER_IS(GCC)
COMPILER_WARNING_IGNORED(-Wdeprecated-declarations)
#endif
// Start an OS process of absolute executable path with arguments `argv`.
// Return PID of the process.
static pid_t
start_process(const char *abspath, char *const *argv)
{
// Not calling non-async-signal-safe functions between vfork
// and execv for safety
int dev_null = rb_cloexec_open(ruby_null_device, O_WRONLY, 0);
if (dev_null < 0) {
verbose(1, "MJIT: Failed to open a null device: %s", strerror(errno));
return -1;
}
if (mjit_opts.verbose >= 2) {
const char *arg;
fprintf(stderr, "Starting process: %s", abspath);
for (int i = 0; (arg = argv[i]) != NULL; i++)
fprintf(stderr, " %s", arg);
fprintf(stderr, "\n");
}
pid_t pid;
#ifdef _WIN32
extern HANDLE rb_w32_start_process(const char *abspath, char *const *argv, int out_fd);
int out_fd = 0;
if (mjit_opts.verbose <= 1) {
// Discard cl.exe's outputs like:
// _ruby_mjit_p12u3.c
// Creating library C:.../_ruby_mjit_p12u3.lib and object C:.../_ruby_mjit_p12u3.exp
out_fd = dev_null;
}
pid = (pid_t)rb_w32_start_process(abspath, argv, out_fd);
if (pid == 0) {
verbose(1, "MJIT: Failed to create process: %s", dlerror());
return -1;
}
#else
if ((pid = vfork()) == 0) { /* TODO: reuse some function in process.c */
umask(0077);
if (mjit_opts.verbose == 0) {
// CC can be started in a thread using a file which has been
// already removed while MJIT is finishing. Discard the
// messages about missing files.
dup2(dev_null, STDERR_FILENO);
dup2(dev_null, STDOUT_FILENO);
}
(void)close(dev_null);
pid = execv(abspath, argv); // Pid will be negative on an error
// Even if we successfully found CC to compile PCH we still can
// fail with loading the CC in very rare cases for some reasons.
// Stop the forked process in this case.
verbose(1, "MJIT: Error in execv: %s", abspath);
_exit(1);
}
#endif
(void)close(dev_null);
return pid;
}
COMPILER_WARNING_POP
// Execute an OS process of executable PATH with arguments ARGV.
// Return -1 or -2 if failed to execute, otherwise exit code of the process.
// TODO: Use a similar function in process.c
static int
exec_process(const char *path, char *const argv[])
{
int stat, exit_code = -2;
rb_vm_t *vm = WAITPID_USE_SIGCHLD ? GET_VM() : 0;
rb_nativethread_cond_t cond;
if (vm) {
rb_native_cond_initialize(&cond);
rb_native_mutex_lock(&vm->waitpid_lock);
}
pid_t pid = start_process(path, argv);
for (;pid > 0;) {
pid_t r = vm ? ruby_waitpid_locked(vm, pid, &stat, 0, &cond)
: waitpid(pid, &stat, 0);
if (r == -1) {
if (errno == EINTR) continue;
fprintf(stderr, "[%"PRI_PIDT_PREFIX"d] waitpid(%lu): %s (SIGCHLD=%d,%u)\n",
getpid(), (unsigned long)pid, strerror(errno),
RUBY_SIGCHLD, SIGCHLD_LOSSY);
break;
}
else if (r == pid) {
if (WIFEXITED(stat)) {
exit_code = WEXITSTATUS(stat);
break;
}
else if (WIFSIGNALED(stat)) {
exit_code = -1;
break;
}
}
}
if (vm) {
rb_native_mutex_unlock(&vm->waitpid_lock);
rb_native_cond_destroy(&cond);
}
return exit_code;
}
static void
remove_so_file(const char *so_file, struct rb_mjit_unit *unit)
{
#if defined(_WIN32)
// Windows can't remove files while it's used.
unit->so_file = strdup(so_file); // lazily delete on `clean_temp_files()`
if (unit->so_file == NULL)
mjit_warning("failed to allocate memory to lazily remove '%s': %s", so_file, strerror(errno));
#else
remove_file(so_file);
#endif
}
// Print _mjitX, but make a human-readable funcname when --jit-debug is used
static void
sprint_funcname(char *funcname, const struct rb_mjit_unit *unit)
{
const rb_iseq_t *iseq = unit->iseq;
if (iseq == NULL || (!mjit_opts.debug && !mjit_opts.debug_flags)) {
sprintf(funcname, "_mjit%d", unit->id);
return;
}
// Generate a short path
const char *path = RSTRING_PTR(rb_iseq_path(iseq));
const char *lib = "/lib/";
const char *version = "/" STRINGIZE(RUBY_API_VERSION_MAJOR) "." STRINGIZE(RUBY_API_VERSION_MINOR) "." STRINGIZE(RUBY_API_VERSION_TEENY) "/";
while (strstr(path, lib)) // skip "/lib/"
path = strstr(path, lib) + strlen(lib);
while (strstr(path, version)) // skip "/x.y.z/"
path = strstr(path, version) + strlen(version);
// Annotate all-normalized method names
const char *method = RSTRING_PTR(iseq->body->location.label);
if (!strcmp(method, "[]")) method = "AREF";
if (!strcmp(method, "[]=")) method = "ASET";
// Print and normalize
sprintf(funcname, "_mjit%d_%s_%s", unit->id, path, method);
for (size_t i = 0; i < strlen(funcname); i++) {
char c = funcname[i];
if (!(('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || ('0' <= c && c <= '9') || c == '_')) {
funcname[i] = '_';
}
}
}
static const int c_file_access_mode =
#ifdef O_BINARY
O_BINARY|
#endif
O_WRONLY|O_EXCL|O_CREAT;
#define append_str2(p, str, len) ((char *)memcpy((p), str, (len))+(len))
#define append_str(p, str) append_str2(p, str, sizeof(str)-1)
#define append_lit(p, str) append_str2(p, str, rb_strlen_lit(str))
#ifdef _MSC_VER
// Compile C file to so. It returns true if it succeeds. (mswin)
static bool
compile_c_to_so(const char *c_file, const char *so_file)
{
const char *files[] = { NULL, NULL, NULL, NULL, NULL, NULL, "-link", libruby_pathflag, NULL };
char *p;
// files[0] = "-Fe*.dll"
files[0] = p = alloca(sizeof(char) * (rb_strlen_lit("-Fe") + strlen(so_file) + 1));
p = append_lit(p, "-Fe");
p = append_str2(p, so_file, strlen(so_file));
*p = '\0';
// files[1] = "-Fo*.obj"
// We don't need .obj file, but it's somehow created to cwd without -Fo and we want to control the output directory.
files[1] = p = alloca(sizeof(char) * (rb_strlen_lit("-Fo") + strlen(so_file) - rb_strlen_lit(DLEXT) + rb_strlen_lit(".obj") + 1));
char *obj_file = p = append_lit(p, "-Fo");
p = append_str2(p, so_file, strlen(so_file) - rb_strlen_lit(DLEXT));
p = append_lit(p, ".obj");
*p = '\0';
// files[2] = "-Yu*.pch"
files[2] = p = alloca(sizeof(char) * (rb_strlen_lit("-Yu") + strlen(pch_file) + 1));
p = append_lit(p, "-Yu");
p = append_str2(p, pch_file, strlen(pch_file));
*p = '\0';
// files[3] = "C:/.../rb_mjit_header-*.obj"
files[3] = p = alloca(sizeof(char) * (strlen(pch_file) + 1));
p = append_str2(p, pch_file, strlen(pch_file) - strlen(".pch"));
p = append_lit(p, ".obj");
*p = '\0';
// files[4] = "-Tc*.c"
files[4] = p = alloca(sizeof(char) * (rb_strlen_lit("-Tc") + strlen(c_file) + 1));
p = append_lit(p, "-Tc");
p = append_str2(p, c_file, strlen(c_file));
*p = '\0';
// files[5] = "-Fd*.pdb"
files[5] = p = alloca(sizeof(char) * (rb_strlen_lit("-Fd") + strlen(pch_file) + 1));
p = append_lit(p, "-Fd");
p = append_str2(p, pch_file, strlen(pch_file) - rb_strlen_lit(".pch"));
p = append_lit(p, ".pdb");
*p = '\0';
char **args = form_args(5, CC_LDSHARED_ARGS, CC_CODEFLAG_ARGS,
files, CC_LIBS, CC_DLDFLAGS_ARGS);
if (args == NULL)
return false;
int exit_code = exec_process(cc_path, args);
free(args);
if (exit_code == 0) {
// remove never-used files (.obj, .lib, .exp, .pdb). XXX: Is there any way not to generate this?
if (!mjit_opts.save_temps) {
char *before_dot;
remove_file(obj_file);
before_dot = obj_file + strlen(obj_file) - rb_strlen_lit(".obj");
append_lit(before_dot, ".lib"); remove_file(obj_file);
append_lit(before_dot, ".exp"); remove_file(obj_file);
append_lit(before_dot, ".pdb"); remove_file(obj_file);
}
}
else {
verbose(2, "compile_c_to_so: compile error: %d", exit_code);
}
return exit_code == 0;
}
#else // _MSC_VER
// The function producing the pre-compiled header.
static void
make_pch(void)
{
const char *rest_args[] = {
# ifdef __clang__
"-emit-pch",
# endif
// -nodefaultlibs is a linker flag, but it may affect cc1 behavior on Gentoo, which should NOT be changed on pch:
// https://gitweb.gentoo.org/proj/gcc-patches.git/tree/7.3.0/gentoo/13_all_default-ssp-fix.patch
GCC_NOSTDLIB_FLAGS
"-o", pch_file, header_file,
NULL,
};
verbose(2, "Creating precompiled header");
char **args = form_args(4, cc_common_args, CC_CODEFLAG_ARGS, cc_added_args, rest_args);
if (args == NULL) {
mjit_warning("making precompiled header failed on forming args");
CRITICAL_SECTION_START(3, "in make_pch");
pch_status = PCH_FAILED;
CRITICAL_SECTION_FINISH(3, "in make_pch");
return;
}
int exit_code = exec_process(cc_path, args);
free(args);
CRITICAL_SECTION_START(3, "in make_pch");
if (exit_code == 0) {
pch_status = PCH_SUCCESS;
}
else {
mjit_warning("Making precompiled header failed on compilation. Stopping MJIT worker...");
pch_status = PCH_FAILED;
}
/* wakeup `mjit_finish` */
rb_native_cond_broadcast(&mjit_pch_wakeup);
CRITICAL_SECTION_FINISH(3, "in make_pch");
}
// Compile .c file to .so file. It returns true if it succeeds. (non-mswin)
static bool
compile_c_to_so(const char *c_file, const char *so_file)
{
const char *options[] = {
"-o", so_file, c_file,
# ifdef __clang__
"-include-pch", pch_file,
# endif
# ifdef _WIN32
libruby_pathflag,
# endif
NULL
};
char **args = form_args(6, CC_LDSHARED_ARGS, CC_CODEFLAG_ARGS,
options, CC_LIBS, CC_DLDFLAGS_ARGS, CC_LINKER_ARGS);
if (args == NULL)
return false;
int exit_code = exec_process(cc_path, args);
free(args);
if (exit_code != 0)
verbose(2, "compile_c_to_so: compile error: %d", exit_code);
return exit_code == 0;
}
static void compile_prelude(FILE *f);
static bool
compile_compact_jit_code(char* c_file)
{
FILE *f;
int fd = rb_cloexec_open(c_file, c_file_access_mode, 0600);
if (fd < 0 || (f = fdopen(fd, "w")) == NULL) {
int e = errno;
if (fd >= 0) (void)close(fd);
verbose(1, "Failed to fopen '%s', giving up JIT for it (%s)", c_file, strerror(e));
return false;
}
compile_prelude(f);
struct rb_mjit_unit *cur = 0;
list_for_each(&active_units.head, cur, unode) {
fprintf(f, "#include \"%s\"\n", cur->c_file);
}
fclose(f);
return true;
}
// Compile all cached .c files and build a single .so file. Reload all JIT func from it.
// This improves the code locality for better performance in terms of iTLB and iCache.
static void
compact_all_jit_code(void)
{
# ifndef _WIN32 // This requires header transformation but we don't transform header on Windows for now
struct rb_mjit_unit *unit, *cur = 0;
double start_time, end_time;
static const char c_ext[] = ".c";
static const char so_ext[] = DLEXT;
char c_file[MAXPATHLEN], so_file[MAXPATHLEN];
// Abnormal use case of rb_mjit_unit that doesn't have ISeq
unit = calloc(1, sizeof(struct rb_mjit_unit)); // To prevent GC, don't use ZALLOC
if (unit == NULL) return;
unit->id = current_unit_num++;
sprint_uniq_filename(so_file, (int)sizeof(so_file), unit->id, MJIT_TMP_PREFIX, so_ext);
sprint_uniq_filename(c_file, (int)sizeof(c_file), unit->id, MJIT_TMP_PREFIX, c_ext);
CRITICAL_SECTION_START(3, "in compact_all_jit_code to guard .c files from unload_units");
bool success = compile_compact_jit_code(c_file);
in_compact = true;
CRITICAL_SECTION_FINISH(3, "in compact_all_jit_code to guard .c files from unload_units");
start_time = real_ms_time();
if (success) {
success = compile_c_to_so(c_file, so_file);
if (!mjit_opts.save_temps)
remove_file(c_file);
}
end_time = real_ms_time();
CRITICAL_SECTION_START(3, "in compact_all_jit_code to release .c files");
in_compact = false;
CRITICAL_SECTION_FINISH(3, "in compact_all_jit_code to release .c files");
if (success) {
void *handle = dlopen(so_file, RTLD_NOW);
if (handle == NULL) {
mjit_warning("failure in loading code from compacted '%s': %s", so_file, dlerror());
free(unit);
return;
}
unit->handle = handle;
// lazily dlclose handle (and .so file for win32) on `mjit_finish()`.
add_to_list(unit, &compact_units);
if (!mjit_opts.save_temps)
remove_so_file(so_file, unit);
CRITICAL_SECTION_START(3, "in compact_all_jit_code to read list");
list_for_each(&active_units.head, cur, unode) {
void *func;
char funcname[MAXPATHLEN];
sprint_funcname(funcname, cur);
if ((func = dlsym(handle, funcname)) == NULL) {
mjit_warning("skipping to reload '%s' from '%s': %s", funcname, so_file, dlerror());
continue;
}
if (cur->iseq) { // Check whether GCed or not
// Usage of jit_code might be not in a critical section.
MJIT_ATOMIC_SET(cur->iseq->body->jit_func, (mjit_func_t)func);
}
}
CRITICAL_SECTION_FINISH(3, "in compact_all_jit_code to read list");
verbose(1, "JIT compaction (%.1fms): Compacted %d methods %s -> %s", end_time - start_time, active_units.length, c_file, so_file);
}
else {
free(unit);
verbose(1, "JIT compaction failure (%.1fms): Failed to compact methods", end_time - start_time);
}
# endif // _WIN32
}
#endif // _MSC_VER
static void *
load_func_from_so(const char *so_file, const char *funcname, struct rb_mjit_unit *unit)
{
void *handle, *func;
handle = dlopen(so_file, RTLD_NOW);
if (handle == NULL) {
mjit_warning("failure in loading code from '%s': %s", so_file, dlerror());
return (void *)NOT_ADDED_JIT_ISEQ_FUNC;
}
func = dlsym(handle, funcname);
unit->handle = handle;
return func;
}
#ifndef __clang__
static const char *
header_name_end(const char *s)
{
const char *e = s + strlen(s);
# ifdef __GNUC__ // don't chomp .pch for mswin
static const char suffix[] = ".gch";
// chomp .gch suffix
if (e > s+sizeof(suffix)-1 && strcmp(e-sizeof(suffix)+1, suffix) == 0) {
e -= sizeof(suffix)-1;
}
# endif
return e;
}
#endif
// Print platform-specific prerequisites in generated code.
static void
compile_prelude(FILE *f)
{
#ifndef __clang__ // -include-pch is used for Clang
const char *s = pch_file;
const char *e = header_name_end(s);
# ifndef _MSC_VER // Visual Studio doesn't expect macro changes around headers. Anyway we don't support compaction there...
fprintf(f, "#ifndef MJIT_PCH\n");
fprintf(f, "#define MJIT_PCH\n");
# endif
fprintf(f, "#include \"");
// print pch_file except .gch for gcc, but keep .pch for mswin
for (; s < e; s++) {
switch(*s) {
case '\\': case '"':
fputc('\\', f);
}
fputc(*s, f);
}
fprintf(f, "\"\n");
# ifndef _MSC_VER
fprintf(f, "#endif\n");
# endif
#endif
#ifdef _WIN32
fprintf(f, "void _pei386_runtime_relocator(void){}\n");
fprintf(f, "int __stdcall DllMainCRTStartup(void* hinstDLL, unsigned int fdwReason, void* lpvReserved) { return 1; }\n");
#endif
}
// Compile ISeq in UNIT and return function pointer of JIT-ed code.
// It may return NOT_COMPILED_JIT_ISEQ_FUNC if something went wrong.
static mjit_func_t
convert_unit_to_func(struct rb_mjit_unit *unit)
{
char c_file_buff[MAXPATHLEN], *c_file = c_file_buff, *so_file, funcname[MAXPATHLEN];
int fd;
FILE *f;
void *func;
double start_time, end_time;
int c_file_len = (int)sizeof(c_file_buff);
static const char c_ext[] = ".c";
static const char so_ext[] = DLEXT;
#ifndef _MSC_VER
static const char o_ext[] = ".o";
char *o_file;
#endif
c_file_len = sprint_uniq_filename(c_file_buff, c_file_len, unit->id, MJIT_TMP_PREFIX, c_ext);
if (c_file_len >= (int)sizeof(c_file_buff)) {
++c_file_len;
c_file = alloca(c_file_len);
c_file_len = sprint_uniq_filename(c_file, c_file_len, unit->id, MJIT_TMP_PREFIX, c_ext);
}
++c_file_len;
#ifndef _MSC_VER
o_file = alloca(c_file_len - sizeof(c_ext) + sizeof(o_ext));
memcpy(o_file, c_file, c_file_len - sizeof(c_ext));
memcpy(&o_file[c_file_len - sizeof(c_ext)], o_ext, sizeof(o_ext));
#endif
so_file = alloca(c_file_len - sizeof(c_ext) + sizeof(so_ext));
memcpy(so_file, c_file, c_file_len - sizeof(c_ext));
memcpy(&so_file[c_file_len - sizeof(c_ext)], so_ext, sizeof(so_ext));
sprint_funcname(funcname, unit);
fd = rb_cloexec_open(c_file, c_file_access_mode, 0600);
if (fd < 0 || (f = fdopen(fd, "w")) == NULL) {
int e = errno;
if (fd >= 0) (void)close(fd);
verbose(1, "Failed to fopen '%s', giving up JIT for it (%s)", c_file, strerror(e));
return (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC;
}
// print #include of MJIT header, etc.
compile_prelude(f);
// wait until mjit_gc_exit_hook is called
CRITICAL_SECTION_START(3, "before mjit_compile to wait GC finish");
while (in_gc) {
verbose(3, "Waiting wakeup from GC");
rb_native_cond_wait(&mjit_gc_wakeup, &mjit_engine_mutex);
}
// We need to check again here because we could've waited on GC above
if (unit->iseq == NULL) {
fclose(f);
if (!mjit_opts.save_temps)
remove_file(c_file);
in_jit = false; // just being explicit for return
}
else {
in_jit = true;
}
CRITICAL_SECTION_FINISH(3, "before mjit_compile to wait GC finish");
if (!in_jit) {
return (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC;
}
// To make MJIT worker thread-safe against GC.compact, copy ISeq values while `in_jit` is true.
long iseq_lineno = 0;
if (FIXNUM_P(unit->iseq->body->location.first_lineno))
// FIX2INT may fallback to rb_num2long(), which is a method call and dangerous in MJIT worker. So using only FIX2LONG.
iseq_lineno = FIX2LONG(unit->iseq->body->location.first_lineno);
char *iseq_label = alloca(RSTRING_LEN(unit->iseq->body->location.label) + 1);
char *iseq_path = alloca(RSTRING_LEN(rb_iseq_path(unit->iseq)) + 1);
strcpy(iseq_label, RSTRING_PTR(unit->iseq->body->location.label));
strcpy(iseq_path, RSTRING_PTR(rb_iseq_path(unit->iseq)));
verbose(2, "start compilation: %s@%s:%ld -> %s", iseq_label, iseq_path, iseq_lineno, c_file);
fprintf(f, "/* %s@%s:%ld */\n\n", iseq_label, iseq_path, iseq_lineno);
bool success = mjit_compile(f, unit->iseq, funcname, unit->id);
// release blocking mjit_gc_start_hook
CRITICAL_SECTION_START(3, "after mjit_compile to wakeup client for GC");
in_jit = false;
verbose(3, "Sending wakeup signal to client in a mjit-worker for GC");
rb_native_cond_signal(&mjit_client_wakeup);
CRITICAL_SECTION_FINISH(3, "in worker to wakeup client for GC");
fclose(f);
if (!success) {
if (!mjit_opts.save_temps)
remove_file(c_file);
verbose(1, "JIT failure: %s@%s:%ld -> %s", iseq_label, iseq_path, iseq_lineno, c_file);
return (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC;
}
start_time = real_ms_time();
success = compile_c_to_so(c_file, so_file);
#ifdef _MSC_VER
if (!mjit_opts.save_temps)
remove_file(c_file);
#else
if (success) {
// Always set c_file for compaction. The value is also used for lazy deletion.
unit->c_file = strdup(c_file);
if (unit->c_file == NULL) {
mjit_warning("failed to allocate memory to remember '%s' (%s), removing it...", c_file, strerror(errno));
}
}
if (!mjit_opts.save_temps && unit->c_file == NULL)
remove_file(c_file);
#endif
end_time = real_ms_time();
if (!success) {
verbose(2, "Failed to generate so: %s", so_file);
return (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC;
}
func = load_func_from_so(so_file, funcname, unit);
if (!mjit_opts.save_temps)
remove_so_file(so_file, unit);
if ((uintptr_t)func > (uintptr_t)LAST_JIT_ISEQ_FUNC) {
verbose(1, "JIT success (%.1fms): %s@%s:%ld -> %s",
end_time - start_time, iseq_label, iseq_path, iseq_lineno, c_file);
}
return (mjit_func_t)func;
}
typedef struct {
const rb_iseq_t *iseq;
union iseq_inline_storage_entry *is_entries;
bool finish_p;
} mjit_copy_job_t;
// Singleton MJIT copy job. This is made global since it needs to be durable even when MJIT worker thread is stopped.
// (ex: register job -> MJIT pause -> MJIT resume -> dispatch job. Actually this should be just cancelled by finish_p check)
static mjit_copy_job_t mjit_copy_job = { .iseq = NULL, .finish_p = true };
static void mjit_copy_job_handler(void *data);
// vm_trace.c
int rb_workqueue_register(unsigned flags, rb_postponed_job_func_t , void *);
// To see cc_entries using index returned by `mjit_capture_cc_entries` in mjit_compile.c
const struct rb_callcache **
mjit_iseq_cc_entries(const struct rb_iseq_constant_body *const body)
{
return body->jit_unit->cc_entries;
}
// Capture cc entries of `captured_iseq` and append them to `compiled_iseq->jit_unit->cc_entries`.
// This is needed when `captured_iseq` is inlined by `compiled_iseq` and GC needs to mark inlined cc.
//
// Index to refer to `compiled_iseq->jit_unit->cc_entries` is returned instead of the address
// because old addresses may be invalidated by `realloc` later. -1 is returned on failure.
//
// This assumes that it's safe to reference cc without acquiring GVL.
int
mjit_capture_cc_entries(const struct rb_iseq_constant_body *compiled_iseq, const struct rb_iseq_constant_body *captured_iseq)
{
struct rb_mjit_unit *unit = compiled_iseq->jit_unit;
unsigned int new_entries_size = unit->cc_entries_size + captured_iseq->ci_size;
VM_ASSERT(captured_iseq->ci_size > 0);
// Allocate new cc_entries and append them to unit->cc_entries
const struct rb_callcache **cc_entries;
int cc_entries_index = unit->cc_entries_size;
if (unit->cc_entries_size == 0) {
VM_ASSERT(unit->cc_entries == NULL);
unit->cc_entries = cc_entries = malloc(sizeof(struct rb_callcache *) * new_entries_size);
if (cc_entries == NULL) return -1;
}
else {
void *cc_ptr = (void *)unit->cc_entries; // get rid of bogus warning by VC
cc_entries = realloc(cc_ptr, sizeof(struct rb_callcache *) * new_entries_size);
if (cc_entries == NULL) return -1;
unit->cc_entries = cc_entries;
cc_entries += cc_entries_index;
}
unit->cc_entries_size = new_entries_size;
// Capture cc to cc_enties
for (unsigned int i = 0; i < captured_iseq->ci_size; i++) {
cc_entries[i] = captured_iseq->call_data[i].cc;
}
return cc_entries_index;
}
// Copy inline cache values of `iseq` to `cc_entries` and `is_entries`.
// These buffers should be pre-allocated properly prior to calling this function.
// Return true if copy succeeds or is not needed.
//
// We're lazily copying cache values from main thread because these cache values
// could be different between ones on enqueue timing and ones on dequeue timing.
bool
mjit_copy_cache_from_main_thread(const rb_iseq_t *iseq, union iseq_inline_storage_entry *is_entries)
{
mjit_copy_job_t *job = &mjit_copy_job; // just a short hand
CRITICAL_SECTION_START(3, "in mjit_copy_cache_from_main_thread");
job->finish_p = true; // disable dispatching this job in mjit_copy_job_handler while it's being modified
CRITICAL_SECTION_FINISH(3, "in mjit_copy_cache_from_main_thread");
job->is_entries = is_entries;
CRITICAL_SECTION_START(3, "in mjit_copy_cache_from_main_thread");
job->iseq = iseq; // Prevernt GC of this ISeq from here
VM_ASSERT(in_jit);
in_jit = false; // To avoid deadlock, allow running GC while waiting for copy job
rb_native_cond_signal(&mjit_client_wakeup); // Unblock main thread waiting in `mjit_gc_start_hook`
job->finish_p = false; // allow dispatching this job in mjit_copy_job_handler
CRITICAL_SECTION_FINISH(3, "in mjit_copy_cache_from_main_thread");
if (UNLIKELY(mjit_opts.wait)) {
mjit_copy_job_handler((void *)job);
}
else if (rb_workqueue_register(0, mjit_copy_job_handler, (void *)job)) {
CRITICAL_SECTION_START(3, "in MJIT copy job wait");
// checking `stop_worker_p` too because `RUBY_VM_CHECK_INTS(ec)` may not
// lush mjit_copy_job_handler when EC_EXEC_TAG() is not TAG_NONE, and then
// `stop_worker()` could dead lock with this function.
while (!job->finish_p && !stop_worker_p) {
rb_native_cond_wait(&mjit_worker_wakeup, &mjit_engine_mutex);
verbose(3, "Getting wakeup from client");
}
CRITICAL_SECTION_FINISH(3, "in MJIT copy job wait");
}
CRITICAL_SECTION_START(3, "in mjit_copy_cache_from_main_thread");
bool success_p = job->finish_p;
// Disable dispatching this job in mjit_copy_job_handler while memory allocated by alloca
// could be expired after finishing this function.
job->finish_p = true;
in_jit = true; // Prohibit GC during JIT compilation
if (job->iseq == NULL) // ISeq GC is notified in mjit_free_iseq
success_p = false;
job->iseq = NULL; // Allow future GC of this ISeq from here
CRITICAL_SECTION_FINISH(3, "in mjit_copy_cache_from_main_thread");
return success_p;
}
// The function implementing a worker. It is executed in a separate
// thread by rb_thread_create_mjit_thread. It compiles precompiled header
// and then compiles requested ISeqs.
void
mjit_worker(void)
{
// Allow only `max_cache_size / 10` times (default: 10) of compaction.
// Note: GC of compacted code has not been implemented yet.
int max_compact_size = mjit_opts.max_cache_size / 10;
if (max_compact_size < 10) max_compact_size = 10;
#ifndef _MSC_VER
if (pch_status == PCH_NOT_READY) {
make_pch();
}
#endif
if (pch_status == PCH_FAILED) {
mjit_enabled = false;
CRITICAL_SECTION_START(3, "in worker to update worker_stopped");
worker_stopped = true;
verbose(3, "Sending wakeup signal to client in a mjit-worker");
rb_native_cond_signal(&mjit_client_wakeup);
CRITICAL_SECTION_FINISH(3, "in worker to update worker_stopped");
return; // TODO: do the same thing in the latter half of mjit_finish
}
// main worker loop
while (!stop_worker_p) {
struct rb_mjit_unit *unit;
// wait until unit is available
CRITICAL_SECTION_START(3, "in worker dequeue");
while ((list_empty(&unit_queue.head) || active_units.length >= mjit_opts.max_cache_size) && !stop_worker_p) {
rb_native_cond_wait(&mjit_worker_wakeup, &mjit_engine_mutex);
verbose(3, "Getting wakeup from client");
}
unit = get_from_list(&unit_queue);
CRITICAL_SECTION_FINISH(3, "in worker dequeue");
if (unit) {
// JIT compile
mjit_func_t func = convert_unit_to_func(unit);
(void)RB_DEBUG_COUNTER_INC_IF(mjit_compile_failures, func == (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC);
CRITICAL_SECTION_START(3, "in jit func replace");
while (in_gc) { // Make sure we're not GC-ing when touching ISeq
verbose(3, "Waiting wakeup from GC");
rb_native_cond_wait(&mjit_gc_wakeup, &mjit_engine_mutex);
}
if (unit->iseq) { // Check whether GCed or not
if ((uintptr_t)func > (uintptr_t)LAST_JIT_ISEQ_FUNC) {
add_to_list(unit, &active_units);
}
// Usage of jit_code might be not in a critical section.
MJIT_ATOMIC_SET(unit->iseq->body->jit_func, func);
}
else {
free_unit(unit);
}
CRITICAL_SECTION_FINISH(3, "in jit func replace");
#ifndef _MSC_VER
// Combine .o files to one .so and reload all jit_func to improve memory locality.
if (compact_units.length < max_compact_size
&& ((!mjit_opts.wait && unit_queue.length == 0 && active_units.length > 1)
|| active_units.length == mjit_opts.max_cache_size)) {
compact_all_jit_code();
}
#endif
}
}
// To keep mutex unlocked when it is destroyed by mjit_finish, don't wrap CRITICAL_SECTION here.
worker_stopped = true;
}
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