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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
**********************************************************************/
#include "internal.h"
#include "ruby/st.h"
#include "ruby/re.h"
#include "ruby/io.h"
#include "ruby/thread.h"
#include "ruby/util.h"
#include "ruby/debug.h"
#include "eval_intern.h"
#include "vm_core.h"
#include "gc.h"
#include "constant.h"
#include "ruby_atomic.h"
#include "probes.h"
#include <stdio.h>
#include <stdarg.h>
#include <setjmp.h>
#include <sys/types.h>
#include <assert.h>
#undef rb_data_object_alloc
#ifndef __has_feature
# define __has_feature(x) 0
#endif
#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 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
#if /* is ASAN enabled? */ \
__has_feature(address_sanitizer) /* Clang */ || \
defined(__SANITIZE_ADDRESS__) /* GCC 4.8.x */
#define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS \
__attribute__((no_address_safety_analysis)) \
__attribute__((noinline))
#else
#define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#if defined(__native_client__) && defined(NACL_NEWLIB)
# include "nacl/resource.h"
# undef HAVE_POSIX_MEMALIGN
# undef HAVE_MEMALIGN
#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(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 0.3
#endif
#ifndef GC_HEAP_FREE_SLOTS_MAX_RATIO
#define GC_HEAP_FREE_SLOTS_MAX_RATIO 0.8
#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)
#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 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_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,
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
FALSE,
#endif
};
/* 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
#define RGENGC_DEBUG 0
#endif
/* 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 livness check
* 5: show all references
*/
#ifndef RGENGC_CHECK_MODE
#define RGENGC_CHECK_MODE 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 0
#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
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
} 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(__BORLANDC__) || 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 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 RNode node;
struct RMatch match;
struct RRational rational;
struct RComplex complex;
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(__BORLANDC__) || 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 heap_page *pages;
struct heap_page *sweep_pages;
#if GC_ENABLE_INCREMENTAL_MARK
struct heap_page *pooled_pages;
#endif
size_t page_length; /* total page count in a heap */
size_t total_slots; /* total slot count (page_length * HEAP_OBJ_LIMIT) */
} rb_heap_t;
enum gc_stat {
gc_stat_none,
gc_stat_marking,
gc_stat_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 {
enum gc_stat stat : 2;
unsigned int immediate_sweep : 1;
unsigned int dont_gc : 1;
unsigned int dont_incremental : 1;
unsigned int during_gc : 1;
unsigned int gc_stressful: 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;
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 swept_slots;
size_t min_free_slots;
size_t max_free_slots;
/* 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;
#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 remembered_wb_unprotected_objects;
size_t remembered_wb_unprotected_objects_limit;
size_t old_objects;
size_t old_objects_limit;
size_t old_objects_at_gc_start;
#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;
#if GC_ENABLE_INCREMENTAL_MARK
struct {
size_t pooled_slots;
size_t step_slots;
} rincgc;
#endif
#endif /* USE_RGENGC */
} rb_objspace_t;
#ifndef HEAP_ALIGN_LOG
/* default tiny heap size: 16KB */
#define HEAP_ALIGN_LOG 14
#endif
#define CEILDIV(i, mod) (((i) + (mod) - 1)/(mod))
enum {
HEAP_ALIGN = (1UL << HEAP_ALIGN_LOG),
HEAP_ALIGN_MASK = (~(~0UL << HEAP_ALIGN_LOG)),
REQUIRED_SIZE_BY_MALLOC = (sizeof(size_t) * 5),
HEAP_SIZE = (HEAP_ALIGN - REQUIRED_SIZE_BY_MALLOC),
HEAP_OBJ_LIMIT = (unsigned int)((HEAP_SIZE - sizeof(struct heap_page_header))/sizeof(struct RVALUE)),
HEAP_BITMAP_LIMIT = CEILDIV(CEILDIV(HEAP_SIZE, sizeof(struct RVALUE)), BITS_BITLENGTH),
HEAP_BITMAP_SIZE = ( BITS_SIZE * HEAP_BITMAP_LIMIT),
HEAP_BITMAP_PLANES = USE_RGENGC ? 3 : 1 /* RGENGC: mark bits, rememberset bits and oldgen bits */
};
struct heap_page {
struct heap_page_body *body;
struct heap_page *prev;
rb_heap_t *heap;
int total_slots;
int free_slots;
int final_slots;
struct {
unsigned int before_sweep : 1;
unsigned int has_remembered_objects : 1;
unsigned int has_long_lived_shady_objects : 1;
} flags;
struct heap_page *free_next;
RVALUE *start;
RVALUE *freelist;
struct heap_page *next;
#if USE_RGENGC
bits_t wb_unprotected_bits[HEAP_BITMAP_LIMIT];
#endif
/* the following three bitmaps are cleared at the beggining of full GC */
bits_t mark_bits[HEAP_BITMAP_LIMIT];
#if USE_RGENGC
bits_t long_lived_bits[HEAP_BITMAP_LIMIT];
bits_t marking_bits[HEAP_BITMAP_LIMIT];
#endif
};
#define GET_PAGE_BODY(x) ((struct heap_page_body *)((bits_t)(x) & ~(HEAP_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_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])
#if USE_RGENGC
#define GET_HEAP_LONG_LIVED_BITS(x) (&GET_HEAP_PAGE(x)->long_lived_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 */
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
#define rb_objspace (*GET_VM()->objspace)
#else
static rb_objspace_t rb_objspace = {{GC_MALLOC_LIMIT_MIN}};
#endif
#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_pages_swept_slots objspace->heap_pages.swept_slots
#define heap_allocatable_pages objspace->heap_pages.allocatable_pages
#define heap_pages_min_free_slots objspace->heap_pages.min_free_slots
#define heap_pages_max_free_slots objspace->heap_pages.max_free_slots
#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
#define is_marking(objspace) ((objspace)->flags.stat == gc_stat_marking)
#define is_sweeping(objspace) ((objspace)->flags.stat == gc_stat_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)->sweep_pages != 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]
int ruby_gc_debug_indent = 0;
VALUE rb_mGC;
int ruby_disable_gc = 0;
void rb_gcdebug_print_obj_condition(VALUE obj);
static void rb_objspace_call_finalizer(rb_objspace_t *objspace);
static VALUE define_final0(VALUE obj, VALUE block);
static void negative_size_allocation_error(const char *);
static void *aligned_malloc(size_t, size_t);
static void aligned_free(void *);
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 full_mark, int immediate_mark, int immediate_sweep, int reason);
static int gc_start(rb_objspace_t *objspace, const int full_mark, const int immediate_mark, const unsigned int immediate_sweep, 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);
#if GC_ENABLE_INCREMENTAL_MARK
static void gc_marks_step(rb_objspace_t *objspace, int slots);
static void gc_marks_continue(rb_objspace_t *objspace, rb_heap_t *heap);
#endif
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);
#if GC_ENABLE_LAZY_SWEEP
static void gc_sweep_continue(rb_objspace_t *objspace, rb_heap_t *heap);
#endif
static void gc_mark(rb_objspace_t *objspace, VALUE ptr);
static void gc_mark_ptr(rb_objspace_t *objspace, VALUE ptr);
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 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 VALUE gc_verify_internal_consistency(VALUE self);
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 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, fmt, ...) \
if ((level) > RGENGC_DEBUG) {} else gc_report_body(level, objspace, fmt, ##__VA_ARGS__)
#else
# define gc_report if (!(RGENGC_DEBUG)) {} 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 <[email protected]>
*/
#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(_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_TEST2(x,f) ((RGENGC_CHECK_MODE && SPECIAL_CONST_P(x)) ? (rb_bug("FL_TEST2: SPECIAL_CONST (%p)", (void *)(x)), 0) : FL_TEST_RAW((x),(f)) != 0)
#define FL_SET2(x,f) do {if (RGENGC_CHECK_MODE && SPECIAL_CONST_P(x)) rb_bug("FL_SET2: SPECIAL_CONST"); RBASIC(x)->flags |= (f);} while (0)
#define FL_UNSET2(x,f) do {if (RGENGC_CHECK_MODE && SPECIAL_CONST_P(x)) rb_bug("FL_UNSET2: SPECIAL_CONST"); RBASIC(x)->flags &= ~(f);} while (0)
#define RVALUE_MARK_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_MARK_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_LONG_LIVED_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_LONG_LIVED_BITS(obj), (obj))
#define RVALUE_MARKING_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), (obj))
#define RVALUE_PAGE_WB_UNPROTECTED(apge, obj) MARKED_IN_BITMAP((page)->wb_unprotected_bits, (obj))
#define RVALUE_PAGE_LONG_LIVED(page, obj) MARKED_IN_BITMAP((page)->long_lived_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_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 inline VALUE
check_rvalue_consistency(const VALUE obj)
{
#if RGENGC_CHECK_MODE > 0
rb_objspace_t *objspace = &rb_objspace;
if (!is_pointer_to_heap(objspace, (void *)obj)) {
rb_bug("check_rvalue_consistency: %p is not a Ruby object.", (void *)obj);
}
else if (SPECIAL_CONST_P(obj)) {
rb_bug("check_rvalue_consistency: %p is a special const.", (void *)obj);
}
else {
int wb_unprotected_bit = RVALUE_WB_UNPROTECTED_BITMAP(obj) != 0;
int long_lived_bit = RVALUE_LONG_LIVED_BITMAP(obj) != 0;
int age = RVALUE_FLAGS_AGE(RBASIC(obj)->flags);
if (BUILTIN_TYPE(obj) == T_NONE) rb_bug("check_rvalue_consistency: %p is T_NONE", obj_info(obj));
if (BUILTIN_TYPE(obj) == T_ZOMBIE) rb_bug("check_rvalue_consistency: %p is T_ZOMBIE", obj_info(obj));
obj_memsize_of((VALUE)obj, FALSE);
/* check generation
*
* OLD == age == 3 && old-bitmap && mark-bit (except incremental marking)
*/
if (age > 0 && wb_unprotected_bit) {
rb_bug("check_rvalue_consistency: %s is not WB protected, but age is %d > 0.", obj_info(obj), age);
}
if (!is_full_marking(objspace) && long_lived_bit && age != RVALUE_OLD_AGE && !wb_unprotected_bit) {
rb_bug("check_rvalue_consistency: %s is long lived, but not old (age: %d) and not WB unprotected.\n", obj_info(obj), age);
}
if (!is_marking(objspace) && !is_sweeping(objspace) && long_lived_bit && RVALUE_MARK_BITMAP(obj) == 0) {
rb_bug("check_rvalue_consistency: %s is long lived, but is not marked while !gc.", obj_info(obj));
}
/*
* check coloring
*
* marking:false marking:true
* marked:false white *invalid*
* marked:true black grey
*/
if (RVALUE_MARKING_BITMAP(obj)) {