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gc.c
7599 lines (6646 loc) · 193 KB
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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 "ruby/ruby.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 "internal.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>
#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) && HAVE_RB_GC_GUARDED_PTR
volatile VALUE *
rb_gc_guarded_ptr(volatile VALUE *ptr)
{
return ptr;
}
#endif
#ifndef GC_HEAP_FREE_SLOTS
#define GC_HEAP_FREE_SLOTS 4096
#endif
#ifndef GC_HEAP_INIT_SLOTS
#define GC_HEAP_INIT_SLOTS 10000
#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_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
typedef struct {
size_t heap_init_slots;
size_t heap_free_slots;
double growth_factor;
size_t growth_max_slots;
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;
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
VALUE gc_stress;
#endif
} ruby_gc_params_t;
static ruby_gc_params_t gc_params = {
GC_HEAP_FREE_SLOTS,
GC_HEAP_INIT_SLOTS,
GC_HEAP_GROWTH_FACTOR,
GC_HEAP_GROWTH_MAX_SLOTS,
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 generational bits check (for debugging)
* 3: enable livness check
* 4: 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_THREEGEN
* Enable/disable three gen GC.
* 0: Infant gen -> Old gen
* 1: Infant gen -> Young -> Old gen
*/
#ifndef RGENGC_THREEGEN
#define RGENGC_THREEGEN 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
#else /* USE_RGENGC */
#define RGENGC_DEBUG 0
#define RGENGC_CHECK_MODE 0
#define RGENGC_PROFILE 0
#define RGENGC_THREEGEN 0
#define RGENGC_ESTIMATE_OLDMALLOC 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_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_RESCAN = 0x008,
GPR_FLAG_MAJOR_BY_STRESS = 0x010,
#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;
VALUE 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;
size_t index;
size_t limit;
size_t cache_size;
size_t unused_cache_size;
} mark_stack_t;
typedef struct rb_heap_struct {
struct heap_page *pages;
struct heap_page *free_pages;
struct heap_page *using_page;
struct heap_page *sweep_pages;
RVALUE *freelist;
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;
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;
rb_heap_t eden_heap;
rb_heap_t tomb_heap; /* heap for zombies and ghosts */
struct {
struct heap_page **sorted;
size_t used;
size_t length;
RVALUE *range[2];
size_t limit;
size_t increment;
size_t swept_slots;
size_t min_free_slots;
size_t max_free_slots;
/* final */
size_t final_slots;
RVALUE *deferred_final;
} heap_pages;
struct {
int dont_gc;
int dont_lazy_sweep;
int during_gc;
rb_atomic_t finalizing;
} flags;
st_table *finalizer_table;
mark_stack_t mark_stack;
struct {
int run;
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 generated_normal_object_count;
size_t generated_shady_object_count;
size_t shade_operation_count;
size_t promote_infant_count;
#if RGENGC_THREEGEN
size_t promote_young_count;
#endif
size_t remembered_normal_object_count;
size_t 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 promote_infant_types[RUBY_T_MASK];
#if RGENGC_THREEGEN
size_t promote_young_types[RUBY_T_MASK];
#endif
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_object_num_at_gc_start;
size_t heap_used_at_gc_start;
/* basic statistics */
size_t count;
size_t total_allocated_object_num;
size_t total_freed_object_num;
int latest_gc_info;
} profile;
struct gc_list *global_list;
rb_event_flag_t hook_events; /* this place may be affinity with memory cache */
VALUE gc_stress;
struct mark_func_data_struct {
void *data;
void (*mark_func)(VALUE v, void *data);
} *mark_func_data;
#if USE_RGENGC
struct {
int during_minor_gc;
int parent_object_is_old;
int need_major_gc;
size_t remembered_shady_object_count;
size_t remembered_shady_object_limit;
size_t old_object_count;
size_t old_object_limit;
#if RGENGC_THREEGEN
size_t young_object_count;
#endif
#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;
#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;
RVALUE *freelist;
RVALUE *start;
size_t final_slots;
size_t limit;
struct heap_page *next;
struct heap_page *prev;
struct heap_page *free_next;
rb_heap_t *heap;
int before_sweep;
bits_t mark_bits[HEAP_BITMAP_LIMIT];
#if USE_RGENGC
bits_t rememberset_bits[HEAP_BITMAP_LIMIT];
bits_t oldgen_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 GET_HEAP_MARK_BITS(x) (&GET_HEAP_PAGE(x)->mark_bits[0])
#define GET_HEAP_REMEMBERSET_BITS(x) (&GET_HEAP_PAGE(x)->rememberset_bits[0])
#define GET_HEAP_OLDGEN_BITS(x) (&GET_HEAP_PAGE(x)->oldgen_bits[0])
#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))
/* Aliases */
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
#define rb_objspace (*GET_VM()->objspace)
#define ruby_initial_gc_stress gc_params.gc_stress
VALUE *ruby_initial_gc_stress_ptr = &ruby_initial_gc_stress;
#else
static rb_objspace_t rb_objspace = {{GC_MALLOC_LIMIT_MIN}};
VALUE *ruby_initial_gc_stress_ptr = &rb_objspace.gc_stress;
#endif
#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_pages_used objspace->heap_pages.used
#define heap_pages_length objspace->heap_pages.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_pages_increment objspace->heap_pages.increment
#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->flags.finalizing
#define finalizer_table objspace->finalizer_table
#define global_List objspace->global_list
#define ruby_gc_stress objspace->gc_stress
#define monitor_level objspace->rgengc.monitor_level
#define monitored_object_table objspace->rgengc.monitored_object_table
#define is_lazy_sweeping(heap) ((heap)->sweep_pages != 0)
#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))
#define nomem_error GET_VM()->special_exceptions[ruby_error_nomemory]
int ruby_gc_debug_indent = 0;
VALUE rb_mGC;
int ruby_disable_gc_stress = 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 VALUE lazy_sweep_enable(void);
static int ready_to_gc(rb_objspace_t *objspace);
static int heap_ready_to_gc(rb_objspace_t *objspace, rb_heap_t *heap);
static int garbage_collect(rb_objspace_t *, int full_mark, int immediate_sweep, int reason);
static int garbage_collect_body(rb_objspace_t *, int full_mark, int immediate_sweep, int reason);
static int gc_heap_lazy_sweep(rb_objspace_t *objspace, rb_heap_t *heap);
static void gc_rest_sweep(rb_objspace_t *objspace);
static void gc_heap_rest_sweep(rb_objspace_t *objspace, rb_heap_t *heap);
static void gc_mark_stacked_objects(rb_objspace_t *);
static void gc_mark(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 size_t obj_memsize_of(VALUE obj, int use_tdata);
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)
#define rgengc_report if (RGENGC_DEBUG) rgengc_report_body
static void rgengc_report_body(int level, rb_objspace_t *objspace, const char *fmt, ...);
static const char * type_name(int type, VALUE obj);
static const char *obj_type_name(VALUE obj);
#if USE_RGENGC
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);
#define FL_TEST2(x,f) ((RGENGC_CHECK_MODE && SPECIAL_CONST_P(x)) ? (rb_bug("FL_TEST2: SPECIAL_CONST"), 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_WB_PROTECTED_RAW(obj) FL_TEST2((obj), FL_WB_PROTECTED)
#define RVALUE_WB_PROTECTED(obj) RVALUE_WB_PROTECTED_RAW(check_gen_consistency((VALUE)obj))
#define RVALUE_OLDGEN_BITMAP(obj) MARKED_IN_BITMAP(GET_HEAP_OLDGEN_BITS(obj), (obj))
static inline int is_pointer_to_heap(rb_objspace_t *objspace, void *ptr);
static inline int gc_marked(rb_objspace_t *objspace, VALUE ptr);
static inline VALUE
check_gen_consistency(VALUE obj)
{
if (RGENGC_CHECK_MODE > 0) {
int old_flag = RVALUE_OLDGEN_BITMAP(obj) != 0;
int promoted_flag = FL_TEST2(obj, FL_PROMOTED);
rb_objspace_t *objspace = &rb_objspace;
obj_memsize_of((VALUE)obj, FALSE);
if (!is_pointer_to_heap(objspace, (void *)obj)) {
rb_bug("check_gen_consistency: %p (%s) is not Ruby object.", (void *)obj, obj_type_name(obj));
}
if (promoted_flag) {
if (!RVALUE_WB_PROTECTED_RAW(obj)) {
const char *type = old_flag ? "old" : "young";
rb_bug("check_gen_consistency: %p (%s) is not WB protected, but %s object.", (void *)obj, obj_type_name(obj), type);
}
#if !RGENGC_THREEGEN
if (!old_flag) {
rb_bug("check_gen_consistency: %p (%s) is not infant, but is not old (on 2gen).", (void *)obj, obj_type_name(obj));
}
#endif
if (old_flag && objspace->rgengc.during_minor_gc && !gc_marked(objspace, obj)) {
rb_bug("check_gen_consistency: %p (%s) is old, but is not marked while minor marking.", (void *)obj, obj_type_name(obj));
}
}
else {
if (old_flag) {
rb_bug("check_gen_consistency: %p (%s) is not infant, but is old.", (void *)obj, obj_type_name(obj));
}
}
}
return obj;
}
static inline VALUE
RVALUE_INFANT_P(VALUE obj)
{
check_gen_consistency(obj);
return !FL_TEST2(obj, FL_PROMOTED);
}
static inline VALUE
RVALUE_OLD_BITMAP_P(VALUE obj)
{
check_gen_consistency(obj);
return (RVALUE_OLDGEN_BITMAP(obj) != 0);
}
static inline VALUE
RVALUE_OLD_P(VALUE obj)
{
check_gen_consistency(obj);
#if RGENGC_THREEGEN
return FL_TEST2(obj, FL_PROMOTED) && RVALUE_OLD_BITMAP_P(obj);
#else
return FL_TEST2(obj, FL_PROMOTED);
#endif
}
static inline VALUE
RVALUE_PROMOTED_P(VALUE obj)
{
check_gen_consistency(obj);
return FL_TEST2(obj, FL_PROMOTED);
}
static inline void
RVALUE_PROMOTE_INFANT(VALUE obj)
{
check_gen_consistency(obj);
if (RGENGC_CHECK_MODE && !RVALUE_INFANT_P(obj)) rb_bug("RVALUE_PROMOTE_INFANT: %p (%s) is not infant object.", (void *)obj, obj_type_name(obj));
FL_SET2(obj, FL_PROMOTED);
#if !RGENGC_THREEGEN
MARK_IN_BITMAP(GET_HEAP_OLDGEN_BITS(obj), obj);
#endif
check_gen_consistency(obj);
#if RGENGC_PROFILE >= 1
{
rb_objspace_t *objspace = &rb_objspace;
objspace->profile.promote_infant_count++;
#if RGENGC_PROFILE >= 2
objspace->profile.promote_infant_types[BUILTIN_TYPE(obj)]++;
#endif
}
#endif
}
#if RGENGC_THREEGEN
/*
* Two gen: Infant -> Old.
* Three gen: Infant -> Young -> Old.
*/
static inline VALUE
RVALUE_YOUNG_P(VALUE obj)
{
check_gen_consistency(obj);
return FL_TEST2(obj, FL_PROMOTED) && (RVALUE_OLDGEN_BITMAP(obj) == 0);
}
static inline void
RVALUE_PROMOTE_YOUNG(VALUE obj)
{
check_gen_consistency(obj);
if (RGENGC_CHECK_MODE && !RVALUE_YOUNG_P(obj)) rb_bug("RVALUE_PROMOTE_YOUNG: %p (%s) is not young object.", (void *)obj, obj_type_name(obj));
MARK_IN_BITMAP(GET_HEAP_OLDGEN_BITS(obj), obj);
check_gen_consistency(obj);
#if RGENGC_PROFILE >= 1
{
rb_objspace_t *objspace = &rb_objspace;
objspace->profile.promote_young_count++;
#if RGENGC_PROFILE >= 2
objspace->profile.promote_young_types[BUILTIN_TYPE(obj)]++;
#endif
}
#endif
}
static inline void
RVALUE_DEMOTE_FROM_YOUNG(VALUE obj)
{
if (RGENGC_CHECK_MODE && !RVALUE_YOUNG_P(obj))
rb_bug("RVALUE_DEMOTE_FROM_YOUNG: %p (%s) is not young object.", (void *)obj, obj_type_name(obj));
check_gen_consistency(obj);
FL_UNSET2(obj, FL_PROMOTED);
check_gen_consistency(obj);
}
#endif
static inline void
RVALUE_DEMOTE_FROM_OLD(VALUE obj)
{
if (RGENGC_CHECK_MODE && !RVALUE_OLD_P(obj))
rb_bug("RVALUE_DEMOTE_FROM_OLD: %p (%s) is not old object.", (void *)obj, obj_type_name(obj));
check_gen_consistency(obj);
FL_UNSET2(obj, FL_PROMOTED);
CLEAR_IN_BITMAP(GET_HEAP_OLDGEN_BITS(obj), obj);
check_gen_consistency(obj);
}
#endif /* USE_RGENGC */
/*
--------------------------- ObjectSpace -----------------------------
*/
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
rb_objspace_t *
rb_objspace_alloc(void)
{
rb_objspace_t *objspace = malloc(sizeof(rb_objspace_t));
memset(objspace, 0, sizeof(*objspace));
ruby_gc_stress = ruby_initial_gc_stress;
malloc_limit = gc_params.malloc_limit_min;
return objspace;
}
#endif
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
static void free_stack_chunks(mark_stack_t *);
static void heap_page_free(rb_objspace_t *objspace, struct heap_page *page);
void
rb_objspace_free(rb_objspace_t *objspace)
{
gc_rest_sweep(objspace);
if (objspace->profile.records) {
free(objspace->profile.records);
objspace->profile.records = 0;
}
if (global_List) {
struct gc_list *list, *next;
for (list = global_List; list; list = next) {
next = list->next;
xfree(list);
}
}
if (heap_pages_sorted) {
size_t i;
for (i = 0; i < heap_pages_used; ++i) {
heap_page_free(objspace, heap_pages_sorted[i]);
}
free(heap_pages_sorted);
heap_pages_used = 0;
heap_pages_length = 0;
heap_pages_lomem = 0;
heap_pages_himem = 0;
objspace->eden_heap.page_length = 0;
objspace->eden_heap.total_slots = 0;
objspace->eden_heap.pages = NULL;
}
free_stack_chunks(&objspace->mark_stack);
free(objspace);
}
#endif
static void
heap_pages_expand_sorted(rb_objspace_t *objspace)
{
size_t next_length = heap_pages_increment;
next_length += heap_eden->page_length;
next_length += heap_tomb->page_length;
if (next_length > heap_pages_length) {
struct heap_page **sorted;
size_t size = next_length * sizeof(struct heap_page *);
rgengc_report(3, objspace, "heap_pages_expand_sorted: next_length: %d, size: %d\n", (int)next_length, (int)size);
if (heap_pages_length > 0) {
sorted = (struct heap_page **)realloc(heap_pages_sorted, size);
if (sorted) heap_pages_sorted = sorted;
}
else {
sorted = heap_pages_sorted = (struct heap_page **)malloc(size);
}
if (sorted == 0) {
during_gc = 0;
rb_memerror();
}
heap_pages_length = next_length;
}
}
static inline void
heap_page_add_freeobj(rb_objspace_t *objspace, struct heap_page *page, VALUE obj)
{
RVALUE *p = (RVALUE *)obj;
p->as.free.flags = 0;
p->as.free.next = page->freelist;
page->freelist = p;
rgengc_report(3, objspace, "heap_page_add_freeobj: %p (%s) is added to freelist\n", p, obj_type_name(obj));
}
static inline void
heap_add_freepage(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *page)
{
if (page->freelist) {
page->free_next = heap->free_pages;
heap->free_pages = page;
}
}
static void
heap_unlink_page(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *page)
{
if (page->prev) page->prev->next = page->next;
if (page->next) page->next->prev = page->prev;
if (heap->pages == page) heap->pages = page->next;
page->prev = NULL;
page->next = NULL;
page->heap = NULL;
heap->page_length--;
heap->total_slots -= page->limit;
}
static void
heap_page_free(rb_objspace_t *objspace, struct heap_page *page)
{
heap_pages_used--;
aligned_free(page->body);
free(page);
}
static void
heap_pages_free_unused_pages(rb_objspace_t *objspace)
{
size_t i, j;
for (i = j = 1; j < heap_pages_used; i++) {
struct heap_page *page = heap_pages_sorted[i];
if (page->heap == heap_tomb && page->final_slots == 0) {
if (heap_pages_swept_slots - page->limit > heap_pages_max_free_slots) {
if (0) fprintf(stderr, "heap_pages_free_unused_pages: %d free page %p, heap_pages_swept_slots: %d, heap_pages_max_free_slots: %d\n",
(int)i, page, (int)heap_pages_swept_slots, (int)heap_pages_max_free_slots);
heap_pages_swept_slots -= page->limit;