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Implement Objects on VWA

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This commit implements Objects on Variable Width Allocation. This allows
Objects with more ivars to be embedded (i.e. contents directly follow the
object header) which improves performance through better cache locality.
This commit is contained in:
Peter Zhu 2022-07-11 10:09:39 -04:00
parent 7fda741f6e
commit 7424ea184f
Notes: git 2022-07-15 22:21:27 +09:00
14 changed files with 216 additions and 74 deletions
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2
debug.c
View file

@ -53,7 +53,9 @@ const union {
rb_econv_result_t econv_result;
enum ruby_preserved_encindex encoding_index;
enum ruby_robject_flags robject_flags;
#if !USE_RVARGC
enum ruby_robject_consts robject_consts;
#endif
enum ruby_rmodule_flags rmodule_flags;
enum ruby_rstring_flags rstring_flags;
#if !USE_RVARGC

120
gc.c
View file

@ -2865,18 +2865,65 @@ rb_newobj(void)
return newobj_of(0, T_NONE, 0, 0, 0, FALSE, sizeof(RVALUE));
}
static size_t
rb_obj_embedded_size(uint32_t numiv)
{
return offsetof(struct RObject, as.ary) + (sizeof(VALUE) * numiv);
}
static VALUE
rb_class_instance_allocate_internal(VALUE klass, VALUE flags, bool wb_protected)
{
GC_ASSERT((flags & RUBY_T_MASK) == T_OBJECT);
GC_ASSERT(flags & ROBJECT_EMBED);
st_table *index_tbl = RCLASS_IV_INDEX_TBL(klass);
uint32_t index_tbl_num_entries = index_tbl == NULL ? 0 : (uint32_t)index_tbl->num_entries;
size_t size;
bool embed = true;
#if USE_RVARGC
size = rb_obj_embedded_size(index_tbl_num_entries);
if (!rb_gc_size_allocatable_p(size)) {
size = sizeof(struct RObject);
embed = false;
}
#else
size = sizeof(struct RObject);
if (index_tbl_num_entries > ROBJECT_EMBED_LEN_MAX) {
embed = false;
}
#endif
#if USE_RVARGC
VALUE obj = newobj_of(klass, flags, 0, 0, 0, wb_protected, size);
#else
VALUE obj = newobj_of(klass, flags, Qundef, Qundef, Qundef, wb_protected, size);
#endif
if (embed) {
#if USE_RVARGC
uint32_t capa = (uint32_t)((rb_gc_obj_slot_size(obj) - offsetof(struct RObject, as.ary)) / sizeof(VALUE));
GC_ASSERT(capa >= index_tbl_num_entries);
ROBJECT(obj)->numiv = capa;
for (size_t i = 0; i < capa; i++) {
ROBJECT(obj)->as.ary[i] = Qundef;
}
#endif
}
else {
rb_init_iv_list(obj);
}
return obj;
}
VALUE
rb_newobj_of(VALUE klass, VALUE flags)
{
if ((flags & RUBY_T_MASK) == T_OBJECT) {
st_table *index_tbl = RCLASS_IV_INDEX_TBL(klass);
VALUE obj = newobj_of(klass, (flags | ROBJECT_EMBED) & ~FL_WB_PROTECTED , Qundef, Qundef, Qundef, flags & FL_WB_PROTECTED, sizeof(RVALUE));
if (index_tbl && index_tbl->num_entries > ROBJECT_EMBED_LEN_MAX) {
rb_init_iv_list(obj);
}
return obj;
return rb_class_instance_allocate_internal(klass, (flags | ROBJECT_EMBED) & ~FL_WB_PROTECTED, flags & FL_WB_PROTECTED);
}
else {
return newobj_of(klass, flags & ~FL_WB_PROTECTED, 0, 0, 0, flags & FL_WB_PROTECTED, sizeof(RVALUE));
@ -2989,17 +3036,7 @@ rb_imemo_new_debug(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0,
VALUE
rb_class_allocate_instance(VALUE klass)
{
st_table *index_tbl = RCLASS_IV_INDEX_TBL(klass);
VALUE flags = T_OBJECT | ROBJECT_EMBED;
VALUE obj = newobj_of(klass, flags, Qundef, Qundef, Qundef, RGENGC_WB_PROTECTED_OBJECT, sizeof(RVALUE));
if (index_tbl && index_tbl->num_entries > ROBJECT_EMBED_LEN_MAX) {
rb_init_iv_list(obj);
}
return obj;
return rb_class_instance_allocate_internal(klass, T_OBJECT | ROBJECT_EMBED, RGENGC_WB_PROTECTED_OBJECT);
}
static inline void
@ -8322,17 +8359,23 @@ gc_compact_destination_pool(rb_objspace_t *objspace, rb_size_pool_t *src_pool, V
size_t obj_size;
switch (BUILTIN_TYPE(src)) {
case T_STRING:
obj_size = rb_str_size_as_embedded(src);
break;
case T_ARRAY:
obj_size = rb_ary_size_as_embedded(src);
break;
case T_OBJECT:
obj_size = rb_obj_embedded_size(ROBJECT_NUMIV(src));
break;
case T_STRING:
obj_size = rb_str_size_as_embedded(src);
break;
default:
return src_pool;
}
if (rb_gc_size_allocatable_p(obj_size)) {
if (rb_gc_size_allocatable_p(obj_size)){
return &size_pools[size_pool_idx_for_size(obj_size)];
}
else {
@ -9896,12 +9939,37 @@ gc_ref_update_array(rb_objspace_t * objspace, VALUE v)
}
static void
gc_ref_update_object(rb_objspace_t * objspace, VALUE v)
gc_ref_update_object(rb_objspace_t *objspace, VALUE v)
{
VALUE *ptr = ROBJECT_IVPTR(v);
uint32_t numiv = ROBJECT_NUMIV(v);
uint32_t i, len = ROBJECT_NUMIV(v);
for (i = 0; i < len; i++) {
#if USE_RVARGC
size_t slot_size = rb_gc_obj_slot_size(v);
size_t embed_size = rb_obj_embedded_size(numiv);
if (slot_size >= embed_size && !RB_FL_TEST_RAW(v, ROBJECT_EMBED)) {
// Object can be re-embedded
memcpy(ROBJECT(v)->as.ary, ptr, sizeof(VALUE) * numiv);
RB_FL_SET_RAW(v, ROBJECT_EMBED);
if (ROBJ_TRANSIENT_P(v)) {
ROBJ_TRANSIENT_UNSET(v);
}
else {
xfree(ptr);
}
ptr = ROBJECT(v)->as.ary;
uint32_t capa = (uint32_t)((slot_size - offsetof(struct RObject, as.ary)) / sizeof(VALUE));
ROBJECT(v)->numiv = capa;
// Fill end with Qundef
for (uint32_t i = numiv; i < capa; i++) {
ptr[i] = Qundef;
}
}
#endif
for (uint32_t i = 0; i < numiv; i++) {
UPDATE_IF_MOVED(objspace, ptr[i]);
}
}

2
include/ruby/internal/abi.h
View file

@ -22,7 +22,7 @@
* In released versions of Ruby, this number should not be changed since teeny
* versions of Ruby should guarantee ABI compatibility.
*/
#define RUBY_ABI_VERSION 1
#define RUBY_ABI_VERSION 2
/* Windows does not support weak symbols so ruby_abi_version will not exist
* in the shared library. */

45
include/ruby/internal/core/robject.h
View file

@ -75,6 +75,7 @@ enum ruby_robject_flags {
ROBJECT_EMBED = RUBY_FL_USER1
};
#if !USE_RVARGC
/**
* This is an enum because GDB wants it (rather than a macro). People need not
* bother.
@ -83,6 +84,7 @@ enum ruby_robject_consts {
/** Max possible number of instance variables that can be embedded. */
ROBJECT_EMBED_LEN_MAX = RBIMPL_EMBED_LEN_MAX_OF(VALUE)
};
#endif
struct st_table;
@ -95,6 +97,14 @@ struct RObject {
/** Basic part, including flags and class. */
struct RBasic basic;
#if USE_RVARGC
/**
* Number of instance variables. This is per object; objects might
* differ in this field even if they have the identical classes.
*/
uint32_t numiv;
#endif
/** Object's specific fields. */
union {
@ -103,12 +113,13 @@ struct RObject {
* this pattern.
*/
struct {
#if !USE_RVARGC
/**
* Number of instance variables. This is per object; objects might
* differ in this field even if they have the identical classes.
*/
uint32_t numiv;
#endif
/** Pointer to a C array that holds instance variables. */
VALUE *ivptr;
@ -124,14 +135,38 @@ struct RObject {
struct st_table *iv_index_tbl;
} heap;
/**
* Embedded instance variables. When an object is small enough, it
#if USE_RVARGC
/* Embedded instance variables. When an object is small enough, it
* uses this area to store the instance variables.
*
* This is a length 1 array because:
* 1. GCC has a bug that does not optimize C flexible array members
* (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102452)
* 2. Zero length arrays are not supported by all compilers
*/
VALUE ary[1];
#else
/**
* Embedded instance variables. When an object is small enough, it
* uses this area to store the instance variables.
*/
VALUE ary[ROBJECT_EMBED_LEN_MAX];
#endif
} as;
};
/* Offsets for YJIT */
#ifndef __cplusplus
# if USE_RVARGC
static const int32_t ROBJECT_OFFSET_NUMIV = offsetof(struct RObject, numiv);
# else
static const int32_t ROBJECT_OFFSET_NUMIV = offsetof(struct RObject, as.heap.numiv);
# endif
static const int32_t ROBJECT_OFFSET_AS_HEAP_IVPTR = offsetof(struct RObject, as.heap.ivptr);
static const int32_t ROBJECT_OFFSET_AS_HEAP_IV_INDEX_TBL = offsetof(struct RObject, as.heap.iv_index_tbl);
static const int32_t ROBJECT_OFFSET_AS_ARY = offsetof(struct RObject, as.ary);
#endif
RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
/**
@ -146,12 +181,16 @@ ROBJECT_NUMIV(VALUE obj)
{
RBIMPL_ASSERT_TYPE(obj, RUBY_T_OBJECT);
#if USE_RVARGC
return ROBJECT(obj)->numiv;
#else
if (RB_FL_ANY_RAW(obj, ROBJECT_EMBED)) {
return ROBJECT_EMBED_LEN_MAX;
}
else {
return ROBJECT(obj)->as.heap.numiv;
}
#endif
}
RBIMPL_ATTR_PURE_UNLESS_DEBUG()

4
mjit_compile.c
View file

@ -353,12 +353,16 @@ mjit_compile_body(FILE *f, const rb_iseq_t *iseq, struct compile_status *status)
// Generate merged ivar guards first if needed
if (!status->compile_info->disable_ivar_cache && status->merge_ivar_guards_p) {
fprintf(f, " if (UNLIKELY(!(RB_TYPE_P(GET_SELF(), T_OBJECT) && (rb_serial_t)%"PRI_SERIALT_PREFIX"u == RCLASS_SERIAL(RBASIC(GET_SELF())->klass) &&", status->ivar_serial);
#if USE_RVARGC
fprintf(f, "%"PRIuSIZE" < ROBJECT_NUMIV(GET_SELF())", status->max_ivar_index); // index < ROBJECT_NUMIV(obj)
#else
if (status->max_ivar_index >= ROBJECT_EMBED_LEN_MAX) {
fprintf(f, "%"PRIuSIZE" < ROBJECT_NUMIV(GET_SELF())", status->max_ivar_index); // index < ROBJECT_NUMIV(obj) && !RB_FL_ANY_RAW(obj, ROBJECT_EMBED)
}
else {
fprintf(f, "ROBJECT_EMBED_LEN_MAX == ROBJECT_NUMIV(GET_SELF())"); // index < ROBJECT_NUMIV(obj) && RB_FL_ANY_RAW(obj, ROBJECT_EMBED)
}
#endif
fprintf(f, "))) {\n");
fprintf(f, " goto ivar_cancel;\n");
fprintf(f, " }\n");

33
object.c
View file

@ -267,34 +267,13 @@ rb_obj_singleton_class(VALUE obj)
MJIT_FUNC_EXPORTED void
rb_obj_copy_ivar(VALUE dest, VALUE obj)
{
VALUE *dst_buf = 0;
VALUE *src_buf = 0;
uint32_t len = ROBJECT_EMBED_LEN_MAX;
VALUE *dest_buf = ROBJECT_IVPTR(dest);
VALUE *src_buf = ROBJECT_IVPTR(obj);
uint32_t dest_len = ROBJECT_NUMIV(dest);
uint32_t src_len = ROBJECT_NUMIV(obj);
uint32_t len = dest_len < src_len ? dest_len : src_len;
if (RBASIC(obj)->flags & ROBJECT_EMBED) {
src_buf = ROBJECT(obj)->as.ary;
// embedded -> embedded
if (RBASIC(dest)->flags & ROBJECT_EMBED) {
dst_buf = ROBJECT(dest)->as.ary;
}
// embedded -> extended
else {
dst_buf = ROBJECT(dest)->as.heap.ivptr;
}
}
// extended -> extended
else {
RUBY_ASSERT(!(RBASIC(dest)->flags & ROBJECT_EMBED));
uint32_t src_len = ROBJECT(obj)->as.heap.numiv;
uint32_t dst_len = ROBJECT(dest)->as.heap.numiv;
len = src_len < dst_len ? src_len : dst_len;
dst_buf = ROBJECT(dest)->as.heap.ivptr;
src_buf = ROBJECT(obj)->as.heap.ivptr;
}
MEMCPY(dst_buf, src_buf, VALUE, len);
MEMCPY(dest_buf, src_buf, VALUE, len);
}
static void

24
test/ruby/test_gc_compact.rb
View file

@ -249,6 +249,30 @@ class TestGCCompact < Test::Unit::TestCase
end;
end
def test_moving_objects_between_size_pools
assert_separately([], "#{<<~"begin;"}\n#{<<~"end;"}", timeout: 10, signal: :SEGV)
begin;
class Foo
def add_ivars
10.times do |i|
instance_variable_set("@foo" + i.to_s, 0)
end
end
end
OBJ_COUNT = 500
GC.verify_compaction_references(expand_heap: true, toward: :empty)
ary = OBJ_COUNT.times.map { Foo.new }
ary.each(&:add_ivars)
stats = GC.verify_compaction_references(expand_heap: true, toward: :empty)
assert_operator(stats[:moved_up][:T_OBJECT], :>=, OBJ_COUNT)
end;
end
def test_moving_strings_up_size_pools
omit if !GC.using_rvargc?
assert_separately([], "#{<<~"begin;"}\n#{<<~"end;"}", timeout: 10, signal: :SEGV)

5
test/ruby/test_mjit.rb
View file

@ -969,23 +969,24 @@ class TestMJIT < Test::Unit::TestCase
end
def test_heap_promotion_of_ivar_in_the_middle_of_jit
omit if GC.using_rvargc?
assert_eval_with_jit("#{<<~"begin;"}\n#{<<~"end;"}", stdout: "true\ntrue\n", success_count: 2, min_calls: 2)
begin;
class A
def initialize
@iv0 = nil
@iv1 = []
@iv2 = nil
end
def test(add)
@iv0.nil?
@iv2.nil?
add_ivar if add
@iv1.empty?
end
def add_ivar
@iv2 = nil
@iv3 = nil
end
end

9
tool/ruby_vm/views/_mjit_compile_ivar.erb
View file

@ -30,15 +30,24 @@
fprintf(f, " VM_ASSERT((rb_serial_t)%"PRI_SERIALT_PREFIX"u == RCLASS_SERIAL(RBASIC(obj)->klass));\n", ic_copy->entry->class_serial);
fprintf(f, " VM_ASSERT(index < ROBJECT_NUMIV(obj));\n");
% if insn.name == 'setinstancevariable'
#if USE_RVARGC
fprintf(f, " if (LIKELY(!RB_OBJ_FROZEN_RAW(obj) && index < ROBJECT_NUMIV(obj))) {\n");
fprintf(f, " RB_OBJ_WRITE(obj, &ROBJECT_IVPTR(obj)[index], stack[%d]);\n", b->stack_size - 1);
#else
fprintf(f, " if (LIKELY(!RB_OBJ_FROZEN_RAW(obj) && %s)) {\n", status->max_ivar_index >= ROBJECT_EMBED_LEN_MAX ? "true" : "RB_FL_ANY_RAW(obj, ROBJECT_EMBED)");
fprintf(f, " RB_OBJ_WRITE(obj, &ROBJECT(obj)->as.%s, stack[%d]);\n",
status->max_ivar_index >= ROBJECT_EMBED_LEN_MAX ? "heap.ivptr[index]" : "ary[index]", b->stack_size - 1);
#endif
fprintf(f, " }\n");
% else
fprintf(f, " VALUE val;\n");
#if USE_RVARGC
fprintf(f, " if (LIKELY(index < ROBJECT_NUMIV(obj) && (val = ROBJECT_IVPTR(obj)[index]) != Qundef)) {\n");
#else
fprintf(f, " if (LIKELY(%s && (val = ROBJECT(obj)->as.%s) != Qundef)) {\n",
status->max_ivar_index >= ROBJECT_EMBED_LEN_MAX ? "true" : "RB_FL_ANY_RAW(obj, ROBJECT_EMBED)",
status->max_ivar_index >= ROBJECT_EMBED_LEN_MAX ? "heap.ivptr[index]" : "ary[index]");
#endif
fprintf(f, " stack[%d] = val;\n", b->stack_size);
fprintf(f, " }\n");
%end

8
variable.c
View file

@ -1467,6 +1467,8 @@ void
rb_obj_transient_heap_evacuate(VALUE obj, int promote)
{
if (ROBJ_TRANSIENT_P(obj)) {
assert(!RB_FL_TEST_RAW(obj, ROBJECT_EMBED));
uint32_t len = ROBJECT_NUMIV(obj);
const VALUE *old_ptr = ROBJECT_IVPTR(obj);
VALUE *new_ptr;
@ -1493,7 +1495,7 @@ init_iv_list(VALUE obj, uint32_t len, uint32_t newsize, st_table *index_tbl)
if (RBASIC(obj)->flags & ROBJECT_EMBED) {
newptr = obj_ivar_heap_alloc(obj, newsize);
MEMCPY(newptr, ptr, VALUE, len);
RBASIC(obj)->flags &= ~ROBJECT_EMBED;
RB_FL_UNSET_RAW(obj, ROBJECT_EMBED);
ROBJECT(obj)->as.heap.ivptr = newptr;
}
else {
@ -1503,7 +1505,11 @@ init_iv_list(VALUE obj, uint32_t len, uint32_t newsize, st_table *index_tbl)
for (; len < newsize; len++) {
newptr[len] = Qundef;
}
#if USE_RVARGC
ROBJECT(obj)->numiv = newsize;
#else
ROBJECT(obj)->as.heap.numiv = newsize;
#endif
ROBJECT(obj)->as.heap.iv_index_tbl = index_tbl;
}

6
yjit/bindgen/src/main.rs
View file

@ -62,6 +62,9 @@ fn main() {
// Import YARV bytecode instruction constants
.allowlist_type("ruby_vminsn_type")
// From include/ruby/internal/config.h
.allowlist_var("USE_RVARGC")
// From include/ruby/internal/intern/string.h
.allowlist_function("rb_utf8_str_new")
.allowlist_function("rb_str_buf_append")
@ -135,7 +138,8 @@ fn main() {
// From include/ruby/internal/core/robject.h
.allowlist_type("ruby_robject_flags")
.allowlist_type("ruby_robject_consts")
// .allowlist_type("ruby_robject_consts") // Removed when USE_RVARGC
.allowlist_var("ROBJECT_OFFSET_.*")
// From include/ruby/internal/core/rarray.h
.allowlist_type("ruby_rarray_flags")

21
yjit/src/codegen.rs
View file

@ -1966,9 +1966,17 @@ fn gen_get_ivar(
ctx.stack_pop(1);
}
if USE_RVARGC != 0 {
// Check that the ivar table is big enough
// Check that the slot is inside the ivar table (num_slots > index)
let num_slots = mem_opnd(32, REG0, ROBJECT_OFFSET_NUMIV);
cmp(cb, num_slots, uimm_opnd(ivar_index as u64));
jle_ptr(cb, counted_exit!(ocb, side_exit, getivar_idx_out_of_range));
}
// Compile time self is embedded and the ivar index lands within the object
let test_result = unsafe { FL_TEST_RAW(comptime_receiver, VALUE(ROBJECT_EMBED.as_usize())) != VALUE(0) };
if test_result && ivar_index < (ROBJECT_EMBED_LEN_MAX.as_usize()) {
if test_result {
// See ROBJECT_IVPTR() from include/ruby/internal/core/robject.h
// Guard that self is embedded
@ -1988,7 +1996,7 @@ fn gen_get_ivar(
);
// Load the variable
let offs = RUBY_OFFSET_ROBJECT_AS_ARY + (ivar_index * SIZEOF_VALUE) as i32;
let offs = ROBJECT_OFFSET_AS_ARY + (ivar_index * SIZEOF_VALUE) as i32;
let ivar_opnd = mem_opnd(64, REG0, offs);
mov(cb, REG1, ivar_opnd);
@ -2019,17 +2027,16 @@ fn gen_get_ivar(
side_exit,
);
// Check that the extended table is big enough
if ivar_index > (ROBJECT_EMBED_LEN_MAX.as_usize()) {
if USE_RVARGC == 0 {
// Check that the extended table is big enough
// Check that the slot is inside the extended table (num_slots > index)
let num_slots = mem_opnd(32, REG0, RUBY_OFFSET_ROBJECT_AS_HEAP_NUMIV);
let num_slots = mem_opnd(32, REG0, ROBJECT_OFFSET_NUMIV);
cmp(cb, num_slots, uimm_opnd(ivar_index as u64));
jle_ptr(cb, counted_exit!(ocb, side_exit, getivar_idx_out_of_range));
}
// Get a pointer to the extended table
let tbl_opnd = mem_opnd(64, REG0, RUBY_OFFSET_ROBJECT_AS_HEAP_IVPTR);
let tbl_opnd = mem_opnd(64, REG0, ROBJECT_OFFSET_AS_HEAP_IVPTR);
mov(cb, REG0, tbl_opnd);
// Read the ivar from the extended table

4
yjit/src/cruby.rs
View file

@ -739,10 +739,6 @@ mod manual_defs {
pub const RUBY_OFFSET_RSTRUCT_AS_HEAP_PTR: i32 = 24; // struct RStruct, subfield "as.heap.ptr"
pub const RUBY_OFFSET_RSTRUCT_AS_ARY: i32 = 16; // struct RStruct, subfield "as.ary"
pub const RUBY_OFFSET_ROBJECT_AS_ARY: i32 = 16; // struct RObject, subfield "as.ary"
pub const RUBY_OFFSET_ROBJECT_AS_HEAP_NUMIV: i32 = 16; // struct RObject, subfield "as.heap.numiv"
pub const RUBY_OFFSET_ROBJECT_AS_HEAP_IVPTR: i32 = 24; // struct RObject, subfield "as.heap.ivptr"
// Constants from rb_control_frame_t vm_core.h
pub const RUBY_OFFSET_CFP_PC: i32 = 0;
pub const RUBY_OFFSET_CFP_SP: i32 = 8;

7
yjit/src/cruby_bindings.inc.rs
View file

@ -1,5 +1,6 @@
/* automatically generated by rust-bindgen 0.59.2 */
pub const USE_RVARGC: u32 = 1;
pub const INTEGER_REDEFINED_OP_FLAG: u32 = 1;
pub const FLOAT_REDEFINED_OP_FLAG: u32 = 2;
pub const STRING_REDEFINED_OP_FLAG: u32 = 4;
@ -110,8 +111,10 @@ extern "C" {
}
pub const ROBJECT_EMBED: ruby_robject_flags = 8192;
pub type ruby_robject_flags = u32;
pub const ROBJECT_EMBED_LEN_MAX: ruby_robject_consts = 3;
pub type ruby_robject_consts = u32;
pub const ROBJECT_OFFSET_NUMIV: i32 = 16;
pub const ROBJECT_OFFSET_AS_HEAP_IVPTR: i32 = 24;
pub const ROBJECT_OFFSET_AS_HEAP_IV_INDEX_TBL: i32 = 32;
pub const ROBJECT_OFFSET_AS_ARY: i32 = 24;
extern "C" {
pub static mut rb_mKernel: VALUE;
}