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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 "eval_intern.h"
#include "vm_core.h"
#include "internal.h"
#include "gc.h"
#include "constant.h"
#include "atomic.h"
#include <stdio.h>
#include <setjmp.h>
#include <sys/types.h>
#include <assert.h>
#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
#ifdef HAVE_VALGRIND_MEMCHECK_H
# include <valgrind/memcheck.h>
# ifndef VALGRIND_MAKE_MEM_DEFINED
# define VALGRIND_MAKE_MEM_DEFINED(p, n) VALGRIND_MAKE_READABLE((p), (n))
# endif
# ifndef VALGRIND_MAKE_MEM_UNDEFINED
# define VALGRIND_MAKE_MEM_UNDEFINED(p, n) VALGRIND_MAKE_WRITABLE((p), (n))
# endif
#else
# define VALGRIND_MAKE_MEM_DEFINED(p, n) /* empty */
# define VALGRIND_MAKE_MEM_UNDEFINED(p, n) /* empty */
#endif
#define rb_setjmp(env) RUBY_SETJMP(env)
#define rb_jmp_buf rb_jmpbuf_t
/* Make alloca work the best possible way. */
#ifdef __GNUC__
# ifndef atarist
# ifndef alloca
# define alloca __builtin_alloca
# endif
# endif /* atarist */
#else
# ifdef HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
void *alloca ();
# endif
# endif /* AIX */
# endif /* HAVE_ALLOCA_H */
#endif /* __GNUC__ */
#ifndef GC_MALLOC_LIMIT
#define GC_MALLOC_LIMIT 8000000
#endif
#define HEAP_MIN_SLOTS 10000
#define FREE_MIN 4096
typedef struct {
unsigned int initial_malloc_limit;
unsigned int initial_heap_min_slots;
unsigned int initial_free_min;
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
int gc_stress;
#endif
} ruby_gc_params_t;
static ruby_gc_params_t initial_params = {
GC_MALLOC_LIMIT,
HEAP_MIN_SLOTS,
FREE_MIN,
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
FALSE,
#endif
};
#define nomem_error GET_VM()->special_exceptions[ruby_error_nomemory]
#define MARK_STACK_MAX 1024
int ruby_gc_debug_indent = 0;
/* for GC profile */
#ifndef GC_PROFILE_MORE_DETAIL
#define GC_PROFILE_MORE_DETAIL 0
#endif
typedef struct gc_profile_record {
double gc_time;
double gc_mark_time;
double gc_sweep_time;
double gc_invoke_time;
size_t heap_use_slots;
size_t heap_live_objects;
size_t heap_free_objects;
size_t heap_total_objects;
size_t heap_use_size;
size_t heap_total_size;
int have_finalize;
int is_marked;
size_t allocate_increase;
size_t allocate_limit;
} gc_profile_record;
static double
getrusage_time(void)
{
#ifdef RUSAGE_SELF
struct rusage usage;
struct timeval time;
getrusage(RUSAGE_SELF, &usage);
time = usage.ru_utime;
return time.tv_sec + time.tv_usec * 1e-6;
#elif defined _WIN32
FILETIME creation_time, exit_time, kernel_time, user_time;
ULARGE_INTEGER ui;
LONG_LONG q;
double t;
if (GetProcessTimes(GetCurrentProcess(),
&creation_time, &exit_time, &kernel_time, &user_time) == 0)
{
return 0.0;
}
memcpy(&ui, &user_time, sizeof(FILETIME));
q = ui.QuadPart / 10L;
t = (DWORD)(q % 1000000L) * 1e-6;
q /= 1000000L;
#ifdef __GNUC__
t += q;
#else
t += (double)(DWORD)(q >> 16) * (1 << 16);
t += (DWORD)q & ~(~0 << 16);
#endif
return t;
#else
return 0.0;
#endif
}
#define GC_PROF_TIMER_START do {\
if (objspace->profile.run) {\
if (!objspace->profile.record) {\
objspace->profile.size = 1000;\
objspace->profile.record = malloc(sizeof(gc_profile_record) * objspace->profile.size);\
}\
if (count >= objspace->profile.size) {\
objspace->profile.size += 1000;\
objspace->profile.record = realloc(objspace->profile.record, sizeof(gc_profile_record) * objspace->profile.size);\
}\
if (!objspace->profile.record) {\
rb_bug("gc_profile malloc or realloc miss");\
}\
MEMZERO(&objspace->profile.record[count], gc_profile_record, 1);\
gc_time = getrusage_time();\
objspace->profile.record[count].gc_invoke_time = gc_time - objspace->profile.invoke_time;\
}\
} while(0)
#define GC_PROF_TIMER_STOP(marked) do {\
if (objspace->profile.run) {\
gc_time = getrusage_time() - gc_time;\
if (gc_time < 0) gc_time = 0;\
objspace->profile.record[count].gc_time = gc_time;\
objspace->profile.record[count].is_marked = !!(marked);\
GC_PROF_SET_HEAP_INFO(objspace->profile.record[count]);\
objspace->profile.count++;\
}\
} while(0)
#if GC_PROFILE_MORE_DETAIL
#define INIT_GC_PROF_PARAMS double gc_time = 0, sweep_time = 0;\
size_t count = objspace->profile.count, total = 0, live = 0
#define GC_PROF_MARK_TIMER_START double mark_time = 0;\
do {\
if (objspace->profile.run) {\
mark_time = getrusage_time();\
}\
} while(0)
#define GC_PROF_MARK_TIMER_STOP do {\
if (objspace->profile.run) {\
mark_time = getrusage_time() - mark_time;\
if (mark_time < 0) mark_time = 0;\
objspace->profile.record[objspace->profile.count].gc_mark_time = mark_time;\
}\
} while(0)
#define GC_PROF_SWEEP_TIMER_START do {\
if (objspace->profile.run) {\
sweep_time = getrusage_time();\
}\
} while(0)
#define GC_PROF_SWEEP_TIMER_STOP do {\
if (objspace->profile.run) {\
sweep_time = getrusage_time() - sweep_time;\
if (sweep_time < 0) sweep_time = 0;\
objspace->profile.record[count].gc_sweep_time = sweep_time;\
}\
} while(0)
#define GC_PROF_SET_MALLOC_INFO do {\
if (objspace->profile.run) {\
gc_profile_record *record = &objspace->profile.record[objspace->profile.count];\
record->allocate_increase = malloc_increase;\
record->allocate_limit = malloc_limit; \
}\
} while(0)
#define GC_PROF_SET_HEAP_INFO(record) do {\
live = objspace->heap.live_num;\
total = heaps_used * HEAP_OBJ_LIMIT;\
(record).heap_use_slots = heaps_used;\
(record).heap_live_objects = live;\
(record).heap_free_objects = total - live;\
(record).heap_total_objects = total;\
(record).have_finalize = deferred_final_list ? Qtrue : Qfalse;\
(record).heap_use_size = live * sizeof(RVALUE);\
(record).heap_total_size = total * sizeof(RVALUE);\
} while(0)
#define GC_PROF_INC_LIVE_NUM objspace->heap.live_num++
#define GC_PROF_DEC_LIVE_NUM objspace->heap.live_num--
#else
#define INIT_GC_PROF_PARAMS double gc_time = 0;\
size_t count = objspace->profile.count, total = 0, live = 0
#define GC_PROF_MARK_TIMER_START
#define GC_PROF_MARK_TIMER_STOP
#define GC_PROF_SWEEP_TIMER_START
#define GC_PROF_SWEEP_TIMER_STOP
#define GC_PROF_SET_MALLOC_INFO
#define GC_PROF_SET_HEAP_INFO(record) do {\
live = objspace->heap.live_num;\
total = heaps_used * HEAP_OBJ_LIMIT;\
(record).heap_total_objects = total;\
(record).heap_use_size = live * sizeof(RVALUE);\
(record).heap_total_size = total * sizeof(RVALUE);\
} while(0)
#define GC_PROF_INC_LIVE_NUM
#define GC_PROF_DEC_LIVE_NUM
#endif
#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;
} as;
#ifdef GC_DEBUG
const char *file;
int line;
#endif
} RVALUE;
#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__CYGWIN__)
#pragma pack(pop)
#endif
struct heaps_slot {
void *membase;
RVALUE *slot;
size_t limit;
uintptr_t *bits;
RVALUE *freelist;
struct heaps_slot *next;
struct heaps_slot *prev;
struct heaps_slot *free_next;
};
struct heaps_header {
struct heaps_slot *base;
uintptr_t *bits;
};
struct sorted_heaps_slot {
RVALUE *start;
RVALUE *end;
struct heaps_slot *slot;
};
struct heaps_free_bitmap {
struct heaps_free_bitmap *next;
};
struct gc_list {
VALUE *varptr;
struct gc_list *next;
};
#ifndef CALC_EXACT_MALLOC_SIZE
#define CALC_EXACT_MALLOC_SIZE 0
#endif
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 heaps_slot *ptr;
struct heaps_slot *sweep_slots;
struct heaps_slot *free_slots;
struct sorted_heaps_slot *sorted;
size_t length;
size_t used;
struct heaps_free_bitmap *free_bitmap;
RVALUE *range[2];
RVALUE *freed;
size_t live_num;
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;
struct {
VALUE buffer[MARK_STACK_MAX];
VALUE *ptr;
int overflow;
} markstack;
struct {
int run;
gc_profile_record *record;
size_t count;
size_t size;
double invoke_time;
} profile;
struct gc_list *global_list;
size_t count;
int gc_stress;
} rb_objspace_t;
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
#define rb_objspace (*GET_VM()->objspace)
#define ruby_initial_gc_stress initial_params.gc_stress
int *ruby_initial_gc_stress_ptr = &ruby_initial_gc_stress;
#else
static rb_objspace_t rb_objspace = {{GC_MALLOC_LIMIT}, {HEAP_MIN_SLOTS}};
int *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 heaps objspace->heap.ptr
#define heaps_length objspace->heap.length
#define heaps_used objspace->heap.used
#define lomem objspace->heap.range[0]
#define himem objspace->heap.range[1]
#define heaps_inc objspace->heap.increment
#define heaps_freed objspace->heap.freed
#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 mark_stack objspace->markstack.buffer
#define mark_stack_ptr objspace->markstack.ptr
#define mark_stack_overflow objspace->markstack.overflow
#define global_List objspace->global_list
#define ruby_gc_stress objspace->gc_stress
#define initial_malloc_limit initial_params.initial_malloc_limit
#define initial_heap_min_slots initial_params.initial_heap_min_slots
#define initial_free_min initial_params.initial_free_min
#define is_lazy_sweeping(objspace) ((objspace)->heap.sweep_slots != 0)
#define nonspecial_obj_id(obj) (VALUE)((SIGNED_VALUE)(obj)|FIXNUM_FLAG)
#define HEAP_HEADER(p) ((struct heaps_header *)(p))
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);
#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
static void initial_expand_heap(rb_objspace_t *objspace);
void
rb_gc_set_params(void)
{
char *malloc_limit_ptr, *heap_min_slots_ptr, *free_min_ptr;
if (rb_safe_level() > 0) return;
malloc_limit_ptr = getenv("RUBY_GC_MALLOC_LIMIT");
if (malloc_limit_ptr != NULL) {
int malloc_limit_i = atoi(malloc_limit_ptr);
if (RTEST(ruby_verbose))
fprintf(stderr, "malloc_limit=%d (%d)\n",
malloc_limit_i, initial_malloc_limit);
if (malloc_limit_i > 0) {
initial_malloc_limit = malloc_limit_i;
}
}
heap_min_slots_ptr = getenv("RUBY_HEAP_MIN_SLOTS");
if (heap_min_slots_ptr != NULL) {
int heap_min_slots_i = atoi(heap_min_slots_ptr);
if (RTEST(ruby_verbose))
fprintf(stderr, "heap_min_slots=%d (%d)\n",
heap_min_slots_i, initial_heap_min_slots);
if (heap_min_slots_i > 0) {
initial_heap_min_slots = heap_min_slots_i;
initial_expand_heap(&rb_objspace);
}
}
free_min_ptr = getenv("RUBY_FREE_MIN");
if (free_min_ptr != NULL) {
int free_min_i = atoi(free_min_ptr);
if (RTEST(ruby_verbose))
fprintf(stderr, "free_min=%d (%d)\n", free_min_i, initial_free_min);
if (free_min_i > 0) {
initial_free_min = free_min_i;
}
}
}
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
static void gc_sweep(rb_objspace_t *);
static void slot_sweep(rb_objspace_t *, struct heaps_slot *);
static void rest_sweep(rb_objspace_t *);
static void aligned_free(void *);
void
rb_objspace_free(rb_objspace_t *objspace)
{
rest_sweep(objspace);
if (objspace->profile.record) {
free(objspace->profile.record);
objspace->profile.record = 0;
}
if (global_List) {
struct gc_list *list, *next;
for (list = global_List; list; list = next) {
next = list->next;
xfree(list);
}
}
if (objspace->heap.free_bitmap) {
struct heaps_free_bitmap *list, *next;
for (list = objspace->heap.free_bitmap; list; list = next) {
next = list->next;
free(list);
}
}
if (objspace->heap.sorted) {
size_t i;
for (i = 0; i < heaps_used; ++i) {
free(objspace->heap.sorted[i].slot->bits);
aligned_free(objspace->heap.sorted[i].slot->membase);
free(objspace->heap.sorted[i].slot);
}
free(objspace->heap.sorted);
heaps_used = 0;
heaps = 0;
}
free(objspace);
}
#endif
#ifndef HEAP_ALIGN_LOG
/* default tiny heap size: 16KB */
#define HEAP_ALIGN_LOG 14
#endif
#define HEAP_ALIGN (1UL << HEAP_ALIGN_LOG)
#define HEAP_ALIGN_MASK (~(~0UL << HEAP_ALIGN_LOG))
#define REQUIRED_SIZE_BY_MALLOC (sizeof(size_t) * 5)
#define HEAP_SIZE (HEAP_ALIGN - REQUIRED_SIZE_BY_MALLOC)
#define CEILDIV(i, mod) (((i) + (mod) - 1)/(mod))
#define HEAP_OBJ_LIMIT (unsigned int)((HEAP_SIZE - sizeof(struct heaps_header))/sizeof(struct RVALUE))
#define HEAP_BITMAP_LIMIT CEILDIV(CEILDIV(HEAP_SIZE, sizeof(struct RVALUE)), sizeof(uintptr_t)*8)
#define GET_HEAP_HEADER(x) (HEAP_HEADER((uintptr_t)(x) & ~(HEAP_ALIGN_MASK)))
#define GET_HEAP_SLOT(x) (GET_HEAP_HEADER(x)->base)
#define GET_HEAP_BITMAP(x) (GET_HEAP_HEADER(x)->bits)
#define NUM_IN_SLOT(p) (((uintptr_t)(p) & HEAP_ALIGN_MASK)/sizeof(RVALUE))
#define BITMAP_INDEX(p) (NUM_IN_SLOT(p) / (sizeof(uintptr_t) * 8))
#define BITMAP_OFFSET(p) (NUM_IN_SLOT(p) & ((sizeof(uintptr_t) * 8)-1))
#define MARKED_IN_BITMAP(bits, p) (bits[BITMAP_INDEX(p)] & ((uintptr_t)1 << BITMAP_OFFSET(p)))
#define MARK_IN_BITMAP(bits, p) (bits[BITMAP_INDEX(p)] = bits[BITMAP_INDEX(p)] | ((uintptr_t)1 << BITMAP_OFFSET(p)))
#define CLEAR_IN_BITMAP(bits, p) (bits[BITMAP_INDEX(p)] &= ~((uintptr_t)1 << BITMAP_OFFSET(p)))
extern st_table *rb_class_tbl;
int ruby_disable_gc_stress = 0;
static void run_final(rb_objspace_t *objspace, VALUE obj);
static int garbage_collect(rb_objspace_t *objspace);
static int gc_lazy_sweep(rb_objspace_t *objspace);
void
rb_global_variable(VALUE *var)
{
rb_gc_register_address(var);
}
static void *
ruby_memerror_body(void *dummy)
{
rb_memerror();
return 0;
}
static void
ruby_memerror(void)
{
if (ruby_thread_has_gvl_p()) {
rb_memerror();
}
else {
if (ruby_native_thread_p()) {
rb_thread_call_with_gvl(ruby_memerror_body, 0);
}
else {
/* no ruby thread */
fprintf(stderr, "[FATAL] failed to allocate memory\n");
exit(EXIT_FAILURE);
}
}
}
void
rb_memerror(void)
{
rb_thread_t *th = GET_THREAD();
if (!nomem_error ||
(rb_thread_raised_p(th, RAISED_NOMEMORY) && rb_safe_level() < 4)) {
fprintf(stderr, "[FATAL] failed to allocate memory\n");
exit(EXIT_FAILURE);
}
if (rb_thread_raised_p(th, RAISED_NOMEMORY)) {
rb_thread_raised_clear(th);
GET_THREAD()->errinfo = nomem_error;
JUMP_TAG(TAG_RAISE);
}
rb_thread_raised_set(th, RAISED_NOMEMORY);
rb_exc_raise(nomem_error);
}
/*
* call-seq:
* GC.stress -> true or false
*
* returns current status of GC stress mode.
*/
static VALUE
gc_stress_get(VALUE self)
{
rb_objspace_t *objspace = &rb_objspace;
return ruby_gc_stress ? Qtrue : Qfalse;
}
/*
* call-seq:
* GC.stress = bool -> bool
*
* Updates the GC stress mode.
*
* When stress mode is enabled the GC is invoked at every GC opportunity:
* all memory and object allocations.
*
* Enabling stress mode makes Ruby very slow, it is only for debugging.
*/
static VALUE
gc_stress_set(VALUE self, VALUE flag)
{
rb_objspace_t *objspace = &rb_objspace;
rb_secure(2);
ruby_gc_stress = RTEST(flag);
return flag;
}
/*
* call-seq:
* GC::Profiler.enable? -> true or false
*
* The current status of GC profile mode.
*/
static VALUE
gc_profile_enable_get(VALUE self)
{
rb_objspace_t *objspace = &rb_objspace;
return objspace->profile.run;
}
/*
* call-seq:
* GC::Profiler.enable -> nil
*
* Starts the GC profiler.
*
*/
static VALUE
gc_profile_enable(void)
{
rb_objspace_t *objspace = &rb_objspace;
objspace->profile.run = TRUE;
return Qnil;
}
/*
* call-seq:
* GC::Profiler.disable -> nil
*
* Stops the GC profiler.
*
*/
static VALUE
gc_profile_disable(void)
{
rb_objspace_t *objspace = &rb_objspace;
objspace->profile.run = FALSE;
return Qnil;
}
/*
* call-seq:
* GC::Profiler.clear -> nil
*
* Clears the GC profiler data.
*
*/
static VALUE
gc_profile_clear(void)
{
rb_objspace_t *objspace = &rb_objspace;
MEMZERO(objspace->profile.record, gc_profile_record, objspace->profile.size);
objspace->profile.count = 0;
return Qnil;
}
static void *
negative_size_allocation_error_with_gvl(void *ptr)
{
rb_raise(rb_eNoMemError, "%s", (const char *)ptr);
return 0; /* should not be reached */
}
static void
negative_size_allocation_error(const char *msg)
{
if (ruby_thread_has_gvl_p()) {
rb_raise(rb_eNoMemError, "%s", msg);
}
else {
if (ruby_native_thread_p()) {
rb_thread_call_with_gvl(negative_size_allocation_error_with_gvl, (void *)msg);
}
else {
fprintf(stderr, "[FATAL] %s\n", msg);
exit(EXIT_FAILURE);
}
}
}
static void *
gc_with_gvl(void *ptr)
{
return (void *)(VALUE)garbage_collect((rb_objspace_t *)ptr);
}
static int
garbage_collect_with_gvl(rb_objspace_t *objspace)
{
if (dont_gc) return TRUE;
if (ruby_thread_has_gvl_p()) {
return garbage_collect(objspace);
}
else {
if (ruby_native_thread_p()) {
return (int)(VALUE)rb_thread_call_with_gvl(gc_with_gvl, (void *)objspace);
}
else {
/* no ruby thread */
fprintf(stderr, "[FATAL] failed to allocate memory\n");
exit(EXIT_FAILURE);
}
}
}
static void vm_xfree(rb_objspace_t *objspace, void *ptr);
static inline size_t
vm_malloc_prepare(rb_objspace_t *objspace, size_t size)
{
if ((ssize_t)size < 0) {
negative_size_allocation_error("negative allocation size (or too big)");
}
if (size == 0) size = 1;
#if CALC_EXACT_MALLOC_SIZE
size += sizeof(size_t);
#endif
if ((ruby_gc_stress && !ruby_disable_gc_stress) ||
(malloc_increase+size) > malloc_limit) {
garbage_collect_with_gvl(objspace);
}
return size;
}
static inline void *
vm_malloc_fixup(rb_objspace_t *objspace, void *mem, size_t size)
{
ATOMIC_SIZE_ADD(malloc_increase, size);
#if CALC_EXACT_MALLOC_SIZE
ATOMIC_SIZE_ADD(objspace->malloc_params.allocated_size, size);
ATOMIC_SIZE_INC(objspace->malloc_params.allocations);
((size_t *)mem)[0] = size;
mem = (size_t *)mem + 1;
#endif
return mem;
}
#define TRY_WITH_GC(alloc) do { \
if (!(alloc) && \
(!garbage_collect_with_gvl(objspace) || \
!(alloc))) { \
ruby_memerror(); \
} \
} while (0)
static void *
vm_xmalloc(rb_objspace_t *objspace, size_t size)
{
void *mem;
size = vm_malloc_prepare(objspace, size);
TRY_WITH_GC(mem = malloc(size));
return vm_malloc_fixup(objspace, mem, size);
}
static void *
vm_xrealloc(rb_objspace_t *objspace, void *ptr, size_t size)
{
void *mem;
#if CALC_EXACT_MALLOC_SIZE
size_t oldsize;
#endif
if ((ssize_t)size < 0) {
negative_size_allocation_error("negative re-allocation size");
}
if (!ptr) return vm_xmalloc(objspace, size);
if (size == 0) {
vm_xfree(objspace, ptr);
return 0;
}
if (ruby_gc_stress && !ruby_disable_gc_stress)
garbage_collect_with_gvl(objspace);
#if CALC_EXACT_MALLOC_SIZE
size += sizeof(size_t);
ptr = (size_t *)ptr - 1;
oldsize = ((size_t *)ptr)[0];
#endif
mem = realloc(ptr, size);
if (!mem) {
if (garbage_collect_with_gvl(objspace)) {
mem = realloc(ptr, size);
}
if (!mem) {
ruby_memerror();
}
}
ATOMIC_SIZE_ADD(malloc_increase, size);
#if CALC_EXACT_MALLOC_SIZE
ATOMIC_SIZE_ADD(objspace->malloc_params.allocated_size, size - oldsize);
((size_t *)mem)[0] = size;
mem = (size_t *)mem + 1;
#endif
return mem;
}
static void
vm_xfree(rb_objspace_t *objspace, void *ptr)
{
#if CALC_EXACT_MALLOC_SIZE
size_t size;
ptr = ((size_t *)ptr) - 1;
size = ((size_t*)ptr)[0];
if (size) {
ATOMIC_SIZE_SUB(objspace->malloc_params.allocated_size, size);
ATOMIC_SIZE_DEC(objspace->malloc_params.allocations);
}
#endif
free(ptr);
}
void *
ruby_xmalloc(size_t size)
{
return vm_xmalloc(&rb_objspace, size);
}
static inline size_t
xmalloc2_size(size_t n, size_t size)
{
size_t len = size * n;
if (n != 0 && size != len / n) {
rb_raise(rb_eArgError, "malloc: possible integer overflow");
}
return len;
}
void *
ruby_xmalloc2(size_t n, size_t size)
{
return vm_xmalloc(&rb_objspace, xmalloc2_size(n, size));
}
static void *
vm_xcalloc(rb_objspace_t *objspace, size_t count, size_t elsize)
{
void *mem;
size_t size;
size = xmalloc2_size(count, elsize);
size = vm_malloc_prepare(objspace, size);
TRY_WITH_GC(mem = calloc(1, size));
return vm_malloc_fixup(objspace, mem, size);
}
void *
ruby_xcalloc(size_t n, size_t size)
{
return vm_xcalloc(&rb_objspace, n, size);
}
void *
ruby_xrealloc(void *ptr, size_t size)
{
return vm_xrealloc(&rb_objspace, ptr, size);
}
void *
ruby_xrealloc2(void *ptr, size_t n, size_t size)
{
size_t len = size * n;
if (n != 0 && size != len / n) {
rb_raise(rb_eArgError, "realloc: possible integer overflow");
}
return ruby_xrealloc(ptr, len);
}
void
ruby_xfree(void *x)
{
if (x)
vm_xfree(&rb_objspace, x);
}
/* Mimic ruby_xmalloc, but need not rb_objspace.
* should return pointer suitable for ruby_xfree
*/
void *
ruby_mimmalloc(size_t size)
{
void *mem;
#if CALC_EXACT_MALLOC_SIZE
size += sizeof(size_t);
#endif
mem = malloc(size);
#if CALC_EXACT_MALLOC_SIZE
/* set 0 for consistency of allocated_size/allocations */
((size_t *)mem)[0] = 0;
mem = (size_t *)mem + 1;
#endif
return mem;
}
/*
* call-seq:
* GC.enable -> true or false
*
* Enables garbage collection, returning <code>true</code> if garbage
* collection was previously disabled.
*
* GC.disable #=> false
* GC.enable #=> true
* GC.enable #=> false
*
*/
VALUE
rb_gc_enable(void)
{
rb_objspace_t *objspace = &rb_objspace;
int old = dont_gc;
dont_gc = FALSE;
return old ? Qtrue : Qfalse;
}