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gc.c
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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/internal/config.h"
#ifdef _WIN32
# include "ruby/ruby.h"
#endif
#include <setjmp.h>
#include <stdarg.h>
#include <stdio.h>
#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
#include <sys/types.h>
#include "constant.h"
#include "debug_counter.h"
#include "eval_intern.h"
#include "gc.h"
#include "id_table.h"
#include "internal.h"
#include "internal/class.h"
#include "internal/complex.h"
#include "internal/cont.h"
#include "internal/error.h"
#include "internal/eval.h"
#include "internal/gc.h"
#include "internal/hash.h"
#include "internal/imemo.h"
#include "internal/io.h"
#include "internal/numeric.h"
#include "internal/object.h"
#include "internal/proc.h"
#include "internal/rational.h"
#include "internal/sanitizers.h"
#include "internal/struct.h"
#include "internal/symbol.h"
#include "internal/thread.h"
#include "internal/variable.h"
#include "internal/warnings.h"
#include "mjit.h"
#include "probes.h"
#include "regint.h"
#include "ruby/debug.h"
#include "ruby/io.h"
#include "ruby/re.h"
#include "ruby/st.h"
#include "ruby/thread.h"
#include "ruby/util.h"
#include "ruby_assert.h"
#include "ruby_atomic.h"
#include "symbol.h"
#include "transient_heap.h"
#include "vm_core.h"
#include "vm_callinfo.h"
#include "builtin.h"
#define rb_setjmp(env) RUBY_SETJMP(env)
#define rb_jmp_buf rb_jmpbuf_t
#undef rb_data_object_wrap
static inline struct rbimpl_size_mul_overflow_tag
size_add_overflow(size_t x, size_t y)
{
size_t z;
bool p;
#if 0
#elif __has_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 rbimpl_size_mul_overflow_tag) { p, z, };
}
static inline struct rbimpl_size_mul_overflow_tag
size_mul_add_overflow(size_t x, size_t y, size_t z) /* x * y + z */
{
struct rbimpl_size_mul_overflow_tag t = rbimpl_size_mul_overflow(x, y);
struct rbimpl_size_mul_overflow_tag u = size_add_overflow(t.right, z);
return (struct rbimpl_size_mul_overflow_tag) { t.left || u.left, u.right };
}
static inline struct rbimpl_size_mul_overflow_tag
size_mul_add_mul_overflow(size_t x, size_t y, size_t z, size_t w) /* x * y + z * w */
{
struct rbimpl_size_mul_overflow_tag t = rbimpl_size_mul_overflow(x, y);
struct rbimpl_size_mul_overflow_tag u = rbimpl_size_mul_overflow(z, w);
struct rbimpl_size_mul_overflow_tag v = size_add_overflow(t.right, u.right);
return (struct rbimpl_size_mul_overflow_tag) { 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 rbimpl_size_mul_overflow_tag t = rbimpl_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 rbimpl_size_mul_overflow_tag 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 rbimpl_size_mul_overflow_tag 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
/* 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
#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;
struct RMoved {
VALUE flags;
VALUE destination;
union {
struct list_node node;
struct list_head head;
} as;
};
#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 )
};
#define popcount_bits rb_popcount_intptr
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;
unsigned int during_minor_gc : 1;
#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;
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 */
/* 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;
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
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)),
HEAP_PAGE_SIZE = HEAP_PAGE_ALIGN,
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 = 4 /* RGENGC: mark, unprotected, uncollectible, marking */
};
struct heap_page {
short total_slots;
short free_slots;
short pinned_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;
bits_t wb_unprotected_bits[HEAP_PAGE_BITMAP_LIMIT];
/* the following three bitmaps are cleared at the beginning of full GC */
bits_t mark_bits[HEAP_PAGE_BITMAP_LIMIT];
bits_t uncollectible_bits[HEAP_PAGE_BITMAP_LIMIT];
bits_t marking_bits[HEAP_PAGE_BITMAP_LIMIT];
/* 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])
#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])
/* 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)
#define is_full_marking(objspace) ((objspace)->flags.during_minor_gc == FALSE)
#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 *gc_vraise(void *ptr));
NORETURN(static void gc_raise(VALUE exc, const char *fmt, ...));
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);