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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
#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_FREE_MIN
#define GC_FREE_MIN 4096
#endif
#ifndef GC_HEAP_MIN_SLOTS
#define GC_HEAP_MIN_SLOTS 10000
#endif
#ifndef GC_HEAP_GROWTH_FACTOR
#define GC_HEAP_GROWTH_FACTOR 1.8
#endif
#ifndef GC_MALLOC_LIMIT
#define GC_MALLOC_LIMIT (8 /* 8 MB */ * 1024 * 1024 /* 1MB */)
#endif
#ifndef GC_MALLOC_LIMIT_MAX
#define GC_MALLOC_LIMIT_MAX (512 /* 512 MB */ * 1024 * 1024 /* 1MB */)
#endif
#ifndef GC_MALLOC_LIMIT_GROWTH_FACTOR
#define GC_MALLOC_LIMIT_GROWTH_FACTOR 1.8
#endif
typedef struct {
unsigned int initial_heap_min_slots;
unsigned int initial_free_min;
double initial_growth_factor;
unsigned int initial_malloc_limit;
unsigned int initial_malloc_limit_max;
double initial_malloc_limit_growth_factor;
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
VALUE gc_stress;
#endif
} ruby_gc_params_t;
static ruby_gc_params_t initial_params = {
GC_HEAP_MIN_SLOTS,
GC_FREE_MIN,
GC_HEAP_GROWTH_FACTOR,
GC_MALLOC_LIMIT,
GC_MALLOC_LIMIT_MAX,
GC_MALLOC_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 bits check (for debugging)
* 3: 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
#else /* USE_RGENGC */
#define RGENGC_DEBUG 0
#define RGENGC_CHECK_MODE 0
#define RGENGC_PROFILE 0
#endif
#ifndef GC_PROFILE_MORE_DETAIL
#define GC_PROFILE_MORE_DETAIL 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
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,
GPR_FLAG_MAJOR_MASK = 0x01f,
/* gc reason */
GPR_FLAG_NEWOBJ = 0x020,
GPR_FLAG_MALLOC = 0x040,
GPR_FLAG_METHOD = 0x080,
GPR_FLAG_CAPI = 0x100,
GPR_FLAG_STRESS = 0x200,
/* others */
GPR_FLAG_IMMEDIATE_SWEEP = 0x400,
GPR_FLAG_HAVE_FINALIZE = 0x800
} 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_slots;
size_t heap_live_objects;
size_t heap_free_objects;
size_t allocate_increase;
size_t allocate_limit;
#if CALC_EXACT_MALLOC_SIZE
size_t allocated_size;
#endif
double prepare_time;
size_t removing_objects;
size_t empty_objects;
#endif
#if RGENGC_PROFILE > 0
size_t oldgen_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_slot_header {
struct heap_slot *slot;
};
struct heap_slot_body {
struct heap_slot_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_objspace {
struct {
size_t limit;
size_t increase;
#if CALC_EXACT_MALLOC_SIZE
size_t allocated_size;
size_t allocations;
#endif
} malloc_params;
struct {
size_t increment;
struct heap_slot *slots;
struct heap_slot *sweep_slots;
struct heap_slot *free_slots;
struct heap_slot *using_slot;
struct heap_slot **sorted;
size_t length;
size_t used;
RVALUE *range[2];
size_t free_num;
size_t free_min;
size_t final_num;
size_t do_heap_free;
} heap;
struct {
int dont_gc;
int dont_lazy_sweep;
int during_gc;
rb_atomic_t finalizing;
} flags;
struct {
st_table *table;
RVALUE *deferred;
} final;
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;
#ifdef RGENGC_PROFILE
size_t generated_normal_object_count;
size_t generated_shady_object_count;
size_t shade_operation_count;
size_t promote_operation_count;
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_operation_count_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_object_num_at_gc_start;
size_t heap_used_at_gc_start;
} profile;
struct gc_list *global_list;
size_t count;
size_t total_allocated_object_num;
size_t total_freed_object_num;
rb_event_flag_t hook_events; /* this place may be affinity with memory cache */
VALUE gc_stress;
RVALUE *freelist;
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_promoted;
/* for check mode */
VALUE parent_object;
unsigned int monitor_level;
st_table *monitored_object_table;
int need_major_gc;
size_t remembered_shady_object_count;
size_t remembered_shady_object_limit;
size_t oldgen_object_count;
size_t oldgen_object_limit;
#if RGENGC_CHECK_MODE >= 2
int have_saved_bitmaps;
#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_slot_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_slot {
struct heap_slot_body *body;
RVALUE *start;
size_t limit;
RVALUE *freelist;
struct heap_slot *next;
struct heap_slot *prev;
struct heap_slot *free_next;
bits_t mark_bits[HEAP_BITMAP_LIMIT];
#if USE_RGENGC
bits_t rememberset_bits[HEAP_BITMAP_LIMIT];
bits_t oldgen_bits[HEAP_BITMAP_LIMIT];
#if RGENGC_CHECK_MODE >= 2
bits_t saved_mark_bits[HEAP_BITMAP_LIMIT];
bits_t saved_rememberset_bits[HEAP_BITMAP_LIMIT];
bits_t saved_oldgen_bits[HEAP_BITMAP_LIMIT];
#endif
#endif
};
#define GET_SLOT_BODY(x) ((struct heap_slot_body *)((bits_t)(x) & ~(HEAP_ALIGN_MASK)))
#define GET_SLOT_HEADER(x) (&GET_SLOT_BODY(x)->header)
#define GET_HEAP_SLOT(x) (GET_SLOT_HEADER(x)->slot)
#define GET_HEAP_MARK_BITS(x) (&GET_HEAP_SLOT(x)->mark_bits[0])
#define GET_HEAP_REMEMBERSET_BITS(x) (&GET_HEAP_SLOT(x)->rememberset_bits[0])
#define GET_HEAP_OLDGEN_BITS(x) (&GET_HEAP_SLOT(x)->oldgen_bits[0])
#define NUM_IN_SLOT(p) (((bits_t)(p) & HEAP_ALIGN_MASK)/sizeof(RVALUE))
#define BITMAP_INDEX(p) (NUM_IN_SLOT(p) / BITS_BITLENGTH )
#define BITMAP_OFFSET(p) (NUM_IN_SLOT(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 initial_params.gc_stress
VALUE *ruby_initial_gc_stress_ptr = &ruby_initial_gc_stress;
#else
static rb_objspace_t rb_objspace = {{GC_MALLOC_LIMIT}};
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_slots objspace->heap.slots
#define heap_length objspace->heap.length
#define heap_used objspace->heap.used
#define lomem objspace->heap.range[0]
#define himem objspace->heap.range[1]
#define heap_inc objspace->heap.increment
#define dont_gc objspace->flags.dont_gc
#define during_gc objspace->flags.during_gc
#define finalizing objspace->flags.finalizing
#define finalizer_table objspace->final.table
#define deferred_final_list objspace->final.deferred
#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 initial_malloc_limit initial_params.initial_malloc_limit
#define initial_malloc_limit_max initial_params.initial_malloc_limit_max
#define initial_malloc_limit_growth_factor initial_params.initial_malloc_limit_growth_factor
#define initial_heap_min_slots initial_params.initial_heap_min_slots
#define initial_free_min initial_params.initial_free_min
#define initial_growth_factor initial_params.initial_growth_factor
#define is_lazy_sweeping(objspace) ((objspace)->heap.sweep_slots != 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;
extern st_table *rb_class_tbl;
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);
VALUE rb_define_final(VALUE obj, VALUE block);
VALUE rb_undefine_final(VALUE obj);
static void run_final(rb_objspace_t *objspace, VALUE obj);
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 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_lazy_sweep(rb_objspace_t *objspace);
static void gc_rest_sweep(rb_objspace_t *objspace);
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 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 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);
static void rgengc_rememberset_mark(rb_objspace_t *objspace);
#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_SHADY(obj) (!FL_TEST2((check_bitmap_consistency((VALUE)obj)), FL_WB_PROTECTED))
#define RVALUE_PROMOTED(obj) FL_TEST2(check_bitmap_consistency((VALUE)obj), FL_OLDGEN)
#define RVALUE_PROMOTED_FROM_BITMAP(x) MARKED_IN_BITMAP(GET_HEAP_OLDGEN_BITS(x),x)
static inline VALUE
check_bitmap_consistency(VALUE obj)
{
#if RUBY_CHECK_MODE > 0
int oldgen_bitmap = MARKED_IN_BITMAP(GET_HEAP_OLDGEN_BITS(obj), obj) != 0;
if (FL_TEST2((obj), FL_OLDGEN) != oldgen_bitmap) {
rb_bug("check_bitmap_consistency: oldgen flag of %p (%s) is %d, but bitmap is %d",
(void *)obj, obj_type_name(obj), FL_TEST2((obj), FL_OLDGEN), oldgen_bitmap);
}
if (FL_TEST2((obj), FL_WB_PROTECTED)) {
/* non-shady */
}
else {
/* shady */
if (oldgen_bitmap) {
rb_bug("check_bitmap_consistency: %p (%s) is shady, but bitmap specifies oldgen",
(void *)obj, obj_type_name(obj));
}
}
#endif
return obj;
}
static inline void
RVALUE_PROMOTE(VALUE obj)
{
check_bitmap_consistency(obj);
MARK_IN_BITMAP(GET_HEAP_OLDGEN_BITS(obj), obj);
FL_SET2(obj, FL_OLDGEN);
#if RGENGC_PROFILE >= 1
{
rb_objspace_t *objspace = &rb_objspace;
objspace->profile.promote_operation_count++;
#if RGENGC_PROFILE >= 2
objspace->profile.promote_operation_count_types[BUILTIN_TYPE(obj)]++;
#endif
}
#endif
}
static inline int
is_before_sweep(VALUE obj)
{
struct heap_slot *slot;
rb_objspace_t *objspace = &rb_objspace;
if (is_lazy_sweeping(objspace)) {
slot = objspace->heap.sweep_slots;
while (slot) {
if (slot->body == GET_SLOT_BODY(obj)) {
return TRUE;
}
slot = slot->next;
}
}
return FALSE;
}
static inline void
RVALUE_DEMOTE(VALUE obj)
{
check_bitmap_consistency(obj);
FL_UNSET2(obj, FL_OLDGEN);
CLEAR_IN_BITMAP(GET_HEAP_OLDGEN_BITS(obj), obj);
}
#endif
/*
--------------------------- 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));
malloc_limit = initial_malloc_limit;
ruby_gc_stress = ruby_initial_gc_stress;
return objspace;
}
#endif
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
static void free_stack_chunks(mark_stack_t *);
static void free_heap_slot(rb_objspace_t *objspace, struct heap_slot *slot);
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 (objspace->heap.sorted) {
size_t i;
for (i = 0; i < heap_used; ++i) {
free_heap_slot(objspace, objspace->heap.sorted[i]);
}
free(objspace->heap.sorted);
heap_used = 0;
heap_slots = 0;
}
free_stack_chunks(&objspace->mark_stack);
free(objspace);
}
#endif
static void
heap_allocate_sorted_array(rb_objspace_t *objspace, size_t next_heap_length)
{
struct heap_slot **p;
size_t size;
size = next_heap_length * sizeof(struct heap_slot *);
if (heap_used > 0) {
p = (struct heap_slot **)realloc(objspace->heap.sorted, size);
if (p) objspace->heap.sorted = p;
}
else {
p = objspace->heap.sorted = (struct heap_slot **)malloc(size);
}
if (p == 0) {
during_gc = 0;
rb_memerror();
}
}
static inline void
heap_slot_add_freeobj(rb_objspace_t *objspace, struct heap_slot *slot, VALUE obj)
{
RVALUE *p = (RVALUE *)obj;
p->as.free.flags = 0;
p->as.free.next = slot->freelist;
slot->freelist = p;
rgengc_report(3, objspace, "heap_slot_add_freeobj: %p (%s) is added to freelist\n", p, obj_type_name(obj));
}
static inline void
heap_add_freeslot(rb_objspace_t *objspace, struct heap_slot *slot)
{
if (slot->freelist) {
slot->free_next = objspace->heap.free_slots;
objspace->heap.free_slots = slot;
}
}
static void
heap_assign_slot(rb_objspace_t *objspace)
{
RVALUE *start, *end, *p;
struct heap_slot *slot;
struct heap_slot_body *slot_body = 0;
size_t hi, lo, mid;
size_t limit = HEAP_OBJ_LIMIT;
/* assign heap_slot body (contains heap_slot_header and RVALUEs) */
slot_body = (struct heap_slot_body *)aligned_malloc(HEAP_ALIGN, HEAP_SIZE);
if (slot_body == 0) {
during_gc = 0;
rb_memerror();
}
/* assign heap_slot entry */
slot = (struct heap_slot *)malloc(sizeof(struct heap_slot));
if (slot == 0) {
aligned_free(slot_body);
during_gc = 0;
rb_memerror();
}
MEMZERO((void*)slot, struct heap_slot, 1);
slot->body = slot_body;
slot->next = objspace->heap.slots;
if (objspace->heap.slots) objspace->heap.slots->prev = slot;
objspace->heap.slots = slot;
/* adjust obj_limit (object number available in this slot) */
start = (RVALUE*)((VALUE)slot_body + sizeof(struct heap_slot_header));
if ((VALUE)start % sizeof(RVALUE) != 0) {
int delta = (int)(sizeof(RVALUE) - ((VALUE)start % sizeof(RVALUE)));
start = (RVALUE*)((VALUE)start + delta);
limit = (HEAP_SIZE - (size_t)((VALUE)start - (VALUE)slot_body))/sizeof(RVALUE);
}
end = start + limit;
/* setup objspace->heap.sorted */
lo = 0;
hi = heap_used;
while (lo < hi) {
struct heap_slot *mid_slot;
mid = (lo + hi) / 2;
mid_slot = objspace->heap.sorted[mid];
if (mid_slot->body < slot_body) {
lo = mid + 1;
}
else if (mid_slot->body > slot_body) {
hi = mid;
}
else {
rb_bug("same heap slot is allocated: %p at %"PRIuVALUE, (void *)slot_body, (VALUE)mid);
}
}
if (hi < heap_used) {
MEMMOVE(&objspace->heap.sorted[hi+1], &objspace->heap.sorted[hi], struct heap_slot_header*, heap_used - hi);
}
/* setup slot */
slot->start = start;
slot->limit = limit;
slot_body->header.slot = objspace->heap.sorted[hi] = slot;
if (lomem == 0 || lomem > start) lomem = start;
if (himem < end) himem = end;
heap_used++;
for (p = start; p != end; p++) {
rgengc_report(3, objspace, "assign_heap_slot: %p is added to freelist\n");
heap_slot_add_freeobj(objspace, slot, (VALUE)p);
}
heap_add_freeslot(objspace, slot);
}
static void
heap_add_slots(rb_objspace_t *objspace, size_t add)
{
size_t i;
size_t next_heap_length;
next_heap_length = heap_used + add;
if (next_heap_length > heap_length) {
heap_allocate_sorted_array(objspace, next_heap_length);
heap_length = next_heap_length;
}
for (i = 0; i < add; i++) {
heap_assign_slot(objspace);
}
heap_inc = 0;
}
static void
heap_init(rb_objspace_t *objspace)
{
heap_add_slots(objspace, initial_heap_min_slots / HEAP_OBJ_LIMIT);
init_mark_stack(&objspace->mark_stack);
#ifdef USE_SIGALTSTACK
{
/* altstack of another threads are allocated in another place */
rb_thread_t *th = GET_THREAD();
void *tmp = th->altstack;
th->altstack = malloc(rb_sigaltstack_size());
free(tmp); /* free previously allocated area */
}
#endif
objspace->profile.invoke_time = getrusage_time();
finalizer_table = st_init_numtable();
}
static void
heap_set_increment(rb_objspace_t *objspace)
{
size_t next_heap_length = (size_t)(heap_used * initial_growth_factor);
if (next_heap_length == heap_used) {
next_heap_length++;
}
heap_inc = next_heap_length - heap_used;
rgengc_report(5, objspace, "heap_set_increment: heap_length: %d, next_heap_length: %d, heap_inc: %d\n",
heap_length, next_heap_length, heap_inc);
if (next_heap_length > heap_length) {
heap_allocate_sorted_array(objspace, next_heap_length);
heap_length = next_heap_length;
}
}
static int
heap_increment(rb_objspace_t *objspace)
{
rgengc_report(5, objspace, "heap_increment: heap_inc: %d\n", heap_inc);
if (heap_inc > 0) {
heap_assign_slot(objspace);
heap_inc--;
return TRUE;
}
return FALSE;
}
static struct heap_slot *
heap_prepare_freeslot(rb_objspace_t *objspace)
{
if (!GC_ENABLE_LAZY_SWEEP && objspace->flags.dont_lazy_sweep) {
if (heap_increment(objspace) == 0 &&
garbage_collect(objspace, FALSE, TRUE, GPR_FLAG_NEWOBJ) == 0) {
goto err;
}
goto ok;
}
if (!ready_to_gc(objspace)) return objspace->heap.free_slots;
during_gc++;
if ((is_lazy_sweeping(objspace) && gc_lazy_sweep(objspace)) ||
heap_increment(objspace)) {
goto ok;
}
#if GC_PROFILE_MORE_DETAIL
objspace->profile.prepare_time = 0;
#endif
if (garbage_collect_body(objspace, 0, 0, GPR_FLAG_NEWOBJ) == 0) {
err:
during_gc = 0;
rb_memerror();
}
ok:
during_gc = 0;
return objspace->heap.free_slots;
}
static inline struct heap_slot *
heap_get_freeslot(rb_objspace_t *objspace)
{
struct heap_slot *slot;
slot = objspace->heap.free_slots;
while (slot == NULL) {
slot = heap_prepare_freeslot(objspace);
}
objspace->heap.free_slots = slot->free_next;
return slot;
}
static inline VALUE
heap_get_freeobj(rb_objspace_t *objspace)
{
RVALUE *p = objspace->freelist;
while (UNLIKELY(p == NULL)) {
struct heap_slot *slot = heap_get_freeslot(objspace);
objspace->heap.using_slot = slot;
p = objspace->freelist = slot->freelist;
slot->freelist = NULL;
}
objspace->freelist = p->as.free.next;
return (VALUE)p;
}
void
rb_objspace_set_event_hook(const rb_event_flag_t event)
{
rb_objspace_t *objspace = &rb_objspace;
objspace->hook_events = event & RUBY_INTERNAL_EVENT_OBJSPACE_MASK;
}
static void
gc_event_hook_body(rb_objspace_t *objspace, const rb_event_flag_t event, VALUE data)
{
rb_thread_t *th = GET_THREAD();
EXEC_EVENT_HOOK(th, event, th->cfp->self, 0, 0, data);
}
#define gc_event_hook(objspace, event, data) do { \
if (UNLIKELY((objspace)->hook_events & (event))) { \
gc_event_hook_body((objspace), (event), (data)); \
} \
} while (0)
static VALUE
newobj_of(VALUE klass, VALUE flags, VALUE v1, VALUE v2, VALUE v3)
{
rb_objspace_t *objspace = &rb_objspace;
VALUE obj;
if (UNLIKELY(during_gc)) {
dont_gc = 1;
during_gc = 0;
rb_bug("object allocation during garbage collection phase");