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[Feature #18045] Implement size classes for GC

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This commits implements size classes in the GC for the Variable Width
Allocation feature. Unless `USE_RVARGC` compile flag is set, only a
single size class is created, maintaining current behaviour. See the
redmine ticket for more details.

Co-authored-by: Aaron Patterson <tenderlove@ruby-lang.org>
This commit is contained in:
Peter Zhu 2021-08-24 13:14:23 -04:00
parent c08d4067be
commit 62bc4a9420
Notes: git 2021-08-25 22:28:42 +09:00 
Merged: https://github.com/ruby/ruby/pull/4773
4 changed files with 752 additions and 332 deletions
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3
class.c
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@ -185,8 +185,7 @@ class_alloc(VALUE flags, VALUE klass)
RVARGC_NEWOBJ_OF(obj, struct RClass, klass, (flags & T_MASK) | FL_PROMOTED1 /* start from age == 2 */ | (RGENGC_WB_PROTECTED_CLASS ? FL_WB_PROTECTED : 0), payload_size);
#if USE_RVARGC
obj->ptr = (rb_classext_t *)rb_rvargc_payload_data_ptr((VALUE)obj + rb_slot_size());
RB_OBJ_WRITTEN(obj, Qundef, (VALUE)obj + rb_slot_size());
obj->ptr = (rb_classext_t *)rb_gc_rvargc_object_data((VALUE)obj);
#else
obj->ptr = ZALLOC(rb_classext_t);
#endif

952
gc.c
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File diff suppressed because it is too large Load diff

2
internal/gc.h
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@ -101,6 +101,7 @@ static inline void *ruby_sized_xrealloc2_inlined(void *ptr, size_t new_count, si
static inline void ruby_sized_xfree_inlined(void *ptr, size_t size);
VALUE rb_class_allocate_instance(VALUE klass);
void rb_gc_ractor_newobj_cache_clear(rb_ractor_newobj_cache_t *newobj_cache);
void *rb_gc_rvargc_object_data(VALUE obj);
RUBY_SYMBOL_EXPORT_BEGIN
/* gc.c (export) */
@ -116,7 +117,6 @@ void rb_gc_mark_vm_stack_values(long n, const VALUE *values);
void *ruby_sized_xrealloc(void *ptr, size_t new_size, size_t old_size) RUBY_ATTR_RETURNS_NONNULL RUBY_ATTR_ALLOC_SIZE((2));
void *ruby_sized_xrealloc2(void *ptr, size_t new_count, size_t element_size, size_t old_count) RUBY_ATTR_RETURNS_NONNULL RUBY_ATTR_ALLOC_SIZE((2, 3));
void ruby_sized_xfree(void *x, size_t size);
int rb_slot_size(void);
RUBY_SYMBOL_EXPORT_END
MJIT_SYMBOL_EXPORT_BEGIN

7
misc/lldb_cruby.py
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@ -533,14 +533,15 @@ class HeapPageIter:
self.target = target
self.start = page.GetChildMemberWithName('start').GetValueAsUnsigned();
self.num_slots = page.GetChildMemberWithName('total_slots').unsigned
self.slot_size = page.GetChildMemberWithName('size_pool').GetChildMemberWithName('slot_size').unsigned
self.counter = 0
self.tRBasic = target.FindFirstType("struct RBasic")
self.tRValue = target.FindFirstType("struct RVALUE")
def is_valid(self):
heap_page_header_size = self.target.FindFirstType("struct heap_page_header").GetByteSize()
rvalue_size = self.tRValue.GetByteSize()
heap_page_obj_limit = int((HEAP_PAGE_SIZE - heap_page_header_size) / rvalue_size)
rvalue_size = self.slot_size
heap_page_obj_limit = int((HEAP_PAGE_SIZE - heap_page_header_size) / self.slot_size)
return (heap_page_obj_limit - 1) <= self.num_slots <= heap_page_obj_limit
@ -549,7 +550,7 @@ class HeapPageIter:
def __next__(self):
if self.counter < self.num_slots:
obj_addr_i = self.start + (self.counter * self.tRValue.GetByteSize())
obj_addr_i = self.start + (self.counter * self.slot_size)
obj_addr = lldb.SBAddress(obj_addr_i, self.target)
slot_info = (self.counter, obj_addr_i, self.target.CreateValueFromAddress("object", obj_addr, self.tRBasic))
self.counter += 1