forked from tmm1/matzruby
/
gc.c
2281 lines (2036 loc) · 50.2 KB
/
gc.c
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/**********************************************************************
gc.c -
$Author$
$Date$
created at: Tue Oct 5 09:44:46 JST 1993
Copyright (C) 1993-2003 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby.h"
#include "rubysig.h"
#include "st.h"
#include "node.h"
#include "env.h"
#include "re.h"
#include <stdio.h>
#include <setjmp.h>
#include <sys/types.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#if defined _WIN32 || defined __CYGWIN__
#include <windows.h>
#endif
void re_free_registers _((struct re_registers*));
void rb_io_fptr_finalize _((struct rb_io_t*));
#define rb_setjmp(env) RUBY_SETJMP(env)
#define rb_jmp_buf rb_jmpbuf_t
#ifdef __CYGWIN__
int _setjmp(), _longjmp();
#endif
#ifndef GC_MALLOC_LIMIT
#if defined(MSDOS) || defined(__human68k__)
#define GC_MALLOC_LIMIT 200000
#else
#define GC_MALLOC_LIMIT (2000000*sizeof(VALUE))
#endif
#endif
#ifndef GC_LEVEL_MAX /*maximum # of VALUEs on 'C' stack during GC*/
#define GC_LEVEL_MAX 8000
#endif
#ifndef GC_STACK_PAD
#define GC_STACK_PAD 200 /* extra padding VALUEs for GC stack */
#endif
#define GC_STACK_MAX (GC_LEVEL_MAX+GC_STACK_PAD)
static VALUE *stack_limit, *gc_stack_limit;
static size_t malloc_increase = 0;
static size_t malloc_limit = GC_MALLOC_LIMIT;
#ifdef MBARI_API
/*
* call-seq:
* GC.limit => increase limit in bytes
*
* Get the # of bytes that may be allocated before triggering
* a mark and sweep by the garbarge collector to reclaim unused storage.
*
* <i>Only available when MBARI_API extentions are enabled at build time</i>
*/
static VALUE gc_getlimit(VALUE mod)
{
return ULONG2NUM(malloc_limit);
}
/*
* call-seq:
* GC.limit= => updated increase limit in bytes
*
* Set the # of bytes that may be allocated before triggering
* a mark and sweep by the garbarge collector to reclaim unused storage.
* Attempts to set the GC.limit= less than 0 will be ignored.
*
* GC.limit=5000000 #=> 5000000
* GC.limit #=> 5000000
* GC.limit=-50 #=> 5000000
* GC.limit=0 #=> 0 #functionally equivalent to GC.stress=true
*
* <i>Only available when MBARI_API extentions are enabled at build time</i>
*/
static VALUE gc_setlimit(VALUE mod, VALUE newLimit)
{
long limit = NUM2LONG(newLimit);
rb_secure(2);
if (limit < 0) return gc_getlimit(mod);
malloc_limit = limit;
return newLimit;
}
/*
* call-seq:
* GC.growth
*
* Get # of bytes that have been allocated since the last mark & sweep
*
* <i>Only available when MBARI_API extentions are enabled at build time</i>
*/
static VALUE gc_growth(VALUE mod)
{
return ULONG2NUM(malloc_increase);
}
/*
* call-seq:
* GC.exorcise
*
* Purge ghost references from recently freed stack space
*
* <i>Only available when MBARI_API extentions are enabled at build time</i>
*/
static VALUE gc_exorcise(VALUE mod)
{
rb_gc_wipe_stack();
return Qnil;
}
#endif /* MBARI_API */
static size_t unstressed_malloc_limit = GC_MALLOC_LIMIT;
/*
* call-seq:
* GC.stress => true or false
*
* returns current status of GC stress mode.
*
*/
static VALUE
gc_stress_get(self)
VALUE self;
{
return malloc_limit ? Qfalse : Qtrue;
}
/*
* call-seq:
* GC.stress = bool => bool
*
* updates GC stress mode.
*
* When GC.stress = true, GC is invoked for all GC opportunity:
* all memory and object allocation.
*
* Since it makes Ruby very slow, it is only for debugging.
*
*/
static VALUE
gc_stress_set(self, bool)
VALUE self, bool;
{
rb_secure(2);
if (!RTEST(bool))
malloc_limit = unstressed_malloc_limit;
else if (malloc_limit > 0) {
unstressed_malloc_limit = malloc_limit;
malloc_limit = 0;
}
return bool;
}
static void run_final();
static VALUE nomem_error;
static void garbage_collect();
NORETURN(void rb_exc_jump _((VALUE)));
void
rb_memerror()
{
rb_thread_t th = rb_curr_thread;
if (!nomem_error ||
(rb_thread_raised_p(th, RAISED_NOMEMORY) && rb_safe_level() < 4)) {
fprintf(stderr, "[FATAL] failed to allocate memory\n");
exit(1);
}
if (rb_thread_raised_p(th, RAISED_NOMEMORY)) {
rb_exc_jump(nomem_error);
}
rb_thread_raised_set(th, RAISED_NOMEMORY);
rb_exc_raise(nomem_error);
}
void *
ruby_xmalloc(size)
long size;
{
void *mem;
if (size < 0) {
rb_raise(rb_eNoMemError, "negative allocation size (or too big)");
}
if (size == 0) size = 1;
if ((malloc_increase+=size) > malloc_limit) {
garbage_collect();
malloc_increase = size;
}
RUBY_CRITICAL(mem = malloc(size));
if (!mem) {
garbage_collect();
RUBY_CRITICAL(mem = malloc(size));
if (!mem) {
rb_memerror();
}
}
#if STACK_WIPE_SITES & 0x100
rb_gc_update_stack_extent();
#endif
return mem;
}
void *
ruby_xcalloc(n, size)
long n, size;
{
void *mem;
mem = xmalloc(n * size);
memset(mem, 0, n * size);
return mem;
}
void *
ruby_xrealloc(ptr, size)
void *ptr;
long size;
{
void *mem;
if (size < 0) {
rb_raise(rb_eArgError, "negative re-allocation size");
}
if (!ptr) return xmalloc(size);
if (size == 0) size = 1;
if ((malloc_increase+=size) > malloc_limit) {
garbage_collect();
malloc_increase = size;
}
RUBY_CRITICAL(mem = realloc(ptr, size));
if (!mem) {
garbage_collect();
RUBY_CRITICAL(mem = realloc(ptr, size));
if (!mem) {
rb_memerror();
}
}
#if STACK_WIPE_SITES & 0x200
rb_gc_update_stack_extent();
#endif
return mem;
}
void
ruby_xfree(x)
void *x;
{
if (x)
RUBY_CRITICAL(free(x));
}
extern int ruby_in_compile;
static int dont_gc;
static int during_gc;
static int need_call_final = 0;
static st_table *finalizer_table = 0;
/*
* 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()
{
int old = dont_gc;
dont_gc = Qfalse;
return old;
}
/*
* call-seq:
* GC.disable => true or false
*
* Disables garbage collection, returning <code>true</code> if garbage
* collection was already disabled.
*
* GC.disable #=> false
* GC.disable #=> true
*
*/
VALUE
rb_gc_disable()
{
int old = dont_gc;
dont_gc = Qtrue;
return old;
}
VALUE rb_mGC;
static struct gc_list {
VALUE *varptr;
struct gc_list *next;
} *global_List = 0;
void
rb_gc_register_address(addr)
VALUE *addr;
{
struct gc_list *tmp;
tmp = ALLOC(struct gc_list);
tmp->next = global_List;
tmp->varptr = addr;
global_List = tmp;
}
void
rb_gc_unregister_address(addr)
VALUE *addr;
{
struct gc_list *tmp = global_List;
if (tmp->varptr == addr) {
global_List = tmp->next;
RUBY_CRITICAL(free(tmp));
return;
}
while (tmp->next) {
if (tmp->next->varptr == addr) {
struct gc_list *t = tmp->next;
tmp->next = tmp->next->next;
RUBY_CRITICAL(free(t));
break;
}
tmp = tmp->next;
}
}
#undef GC_DEBUG
void
rb_global_variable(var)
VALUE *var;
{
rb_gc_register_address(var);
}
#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 {
unsigned long 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 RStruct rstruct;
struct RBignum bignum;
struct RFile file;
struct RNode node;
struct RMatch match;
struct RVarmap varmap;
struct SCOPE scope;
} as;
#ifdef GC_DEBUG
char *file;
int line;
#endif
} RVALUE;
#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__CYGWIN__)
#pragma pack(pop)
#endif
static RVALUE *freelist = 0;
static RVALUE *deferred_final_list = 0;
#define HEAPS_INCREMENT 10
static struct heaps_slot {
void *membase;
RVALUE *slot;
int limit;
} *heaps;
static int heaps_length = 0;
static int heaps_used = 0;
#define HEAP_MIN_SLOTS 10000
static int heap_slots = HEAP_MIN_SLOTS;
#define FREE_MIN 4096
static RVALUE *himem, *lomem;
static void
add_heap()
{
RVALUE *p, *pend;
if (heaps_used == heaps_length) {
/* Realloc heaps */
struct heaps_slot *p;
int length;
heaps_length += HEAPS_INCREMENT;
length = heaps_length*sizeof(struct heaps_slot);
RUBY_CRITICAL(
if (heaps_used > 0) {
p = (struct heaps_slot *)realloc(heaps, length);
if (p) heaps = p;
}
else {
p = heaps = (struct heaps_slot *)malloc(length);
});
if (p == 0) rb_memerror();
}
for (;;) {
RUBY_CRITICAL(p = (RVALUE*)malloc(sizeof(RVALUE)*(heap_slots+1)));
if (p == 0) {
if (heap_slots == HEAP_MIN_SLOTS) {
rb_memerror();
}
heap_slots = HEAP_MIN_SLOTS;
continue;
}
heaps[heaps_used].membase = p;
if ((VALUE)p % sizeof(RVALUE) == 0)
heap_slots += 1;
else
p = (RVALUE*)((VALUE)p + sizeof(RVALUE) - ((VALUE)p % sizeof(RVALUE)));
heaps[heaps_used].slot = p;
heaps[heaps_used].limit = heap_slots;
break;
}
pend = p + heap_slots;
if (lomem == 0 || lomem > p) lomem = p;
if (himem < pend) himem = pend;
heaps_used++;
heap_slots *= 1.8;
if (heap_slots <= 0) heap_slots = HEAP_MIN_SLOTS;
while (p < pend) {
p->as.free.flags = 0;
p->as.free.next = freelist;
freelist = p;
p++;
}
}
#define RANY(o) ((RVALUE*)(o))
int
rb_during_gc()
{
return during_gc;
}
VALUE
rb_newobj()
{
VALUE obj;
if (during_gc)
rb_bug("object allocation during garbage collection phase");
if (!malloc_limit || !freelist) garbage_collect();
obj = (VALUE)freelist;
freelist = freelist->as.free.next;
MEMZERO((void*)obj, RVALUE, 1);
#ifdef GC_DEBUG
RANY(obj)->file = ruby_sourcefile;
RANY(obj)->line = ruby_sourceline;
#endif
return obj;
}
VALUE
rb_data_object_alloc(klass, datap, dmark, dfree)
VALUE klass;
void *datap;
RUBY_DATA_FUNC dmark;
RUBY_DATA_FUNC dfree;
{
NEWOBJ(data, struct RData);
if (klass) Check_Type(klass, T_CLASS);
OBJSETUP(data, klass, T_DATA);
data->data = datap;
data->dfree = dfree;
data->dmark = dmark;
return (VALUE)data;
}
extern st_table *rb_class_tbl;
VALUE *rb_gc_stack_start = 0;
#ifdef __ia64
VALUE *rb_gc_register_stack_start = 0;
#endif
VALUE *rb_gc_stack_end = (VALUE *)STACK_GROW_DIRECTION;
#ifdef DJGPP
/* set stack size (http://www.delorie.com/djgpp/v2faq/faq15_9.html) */
unsigned int _stklen = 0x180000; /* 1.5 kB */
#endif
#if defined(DJGPP) || defined(_WIN32_WCE)
static unsigned int STACK_LEVEL_MAX = 65535;
#elif defined(__human68k__)
unsigned int _stacksize = 262144;
# define STACK_LEVEL_MAX (_stacksize - 4096)
# undef HAVE_GETRLIMIT
#elif defined(HAVE_GETRLIMIT) || defined(_WIN32)
static size_t STACK_LEVEL_MAX = 655300;
#else
# define STACK_LEVEL_MAX 655300
#endif
#ifndef nativeAllocA
/* portable way to return an approximate stack pointer */
NOINLINE(VALUE *__sp(void));
VALUE *__sp(void) {
VALUE tos;
return &tos;
}
# define SET_STACK_END VALUE stack_end
# define STACK_END (&stack_end)
#else
# define SET_STACK_END ((void)0)
# define STACK_END __sp()
#endif
#if STACK_GROW_DIRECTION < 0
# define STACK_LENGTH(start) ((start) - STACK_END)
#elif STACK_GROW_DIRECTION > 0
# define STACK_LENGTH(start) (STACK_END - (start) + 1)
#else
# define STACK_LENGTH(start) ((STACK_END < (start)) ? \
(start) - STACK_END : STACK_END - (start) + 1)
#endif
#if STACK_GROW_DIRECTION > 0
# define STACK_UPPER(a, b) a
#elif STACK_GROW_DIRECTION < 0
# define STACK_UPPER(a, b) b
#else
int rb_gc_stack_grow_direction;
static int
stack_grow_direction(addr)
VALUE *addr;
{
SET_STACK_END;
return rb_gc_stack_grow_direction = STACK_END > addr ? 1 : -1;
}
# define STACK_UPPER(a, b) (rb_gc_stack_grow_direction > 0 ? a : b)
#endif
size_t
ruby_stack_length(start, base)
VALUE *start, **base;
{
SET_STACK_END;
if (base) *base = STACK_UPPER(start, STACK_END);
return STACK_LENGTH(start);
}
int
ruby_stack_check()
{
SET_STACK_END;
return __stack_past(stack_limit, STACK_END);
}
/*
Zero memory that was (recently) part of the stack, but is no longer.
Invoke when stack is deep to mark its extent and when it's shallow to wipe it.
*/
#if STACK_WIPE_METHOD != 4
#if STACK_WIPE_METHOD
void rb_gc_wipe_stack(void)
{
VALUE *stack_end = rb_gc_stack_end;
VALUE *sp = __sp();
rb_gc_stack_end = sp;
#if STACK_WIPE_METHOD == 1
#warning clearing of "ghost references" from the call stack has been disabled
#elif STACK_WIPE_METHOD == 2 /* alloca ghost stack before clearing it */
if (__stack_past(sp, stack_end)) {
size_t bytes = __stack_depth((char *)stack_end, (char *)sp);
STACK_UPPER(sp = nativeAllocA(bytes), stack_end = nativeAllocA(bytes));
__stack_zero(stack_end, sp);
}
#elif STACK_WIPE_METHOD == 3 /* clear unallocated area past stack pointer */
__stack_zero(stack_end, sp); /* will crash if compiler pushes a temp. here */
#else
#error unsupported method of clearing ghost references from the stack
#endif
}
#else
#warning clearing of "ghost references" from the call stack completely disabled
#endif
#endif
#define MARK_STACK_MAX 1024
static VALUE mark_stack[MARK_STACK_MAX];
static VALUE *mark_stack_ptr;
static int mark_stack_overflow;
static void
init_mark_stack()
{
mark_stack_overflow = 0;
mark_stack_ptr = mark_stack;
}
#define MARK_STACK_EMPTY (mark_stack_ptr == mark_stack)
static inline void
push_mark_stack(VALUE ptr)
{
if (!mark_stack_overflow) {
if (mark_stack_ptr - mark_stack < MARK_STACK_MAX)
*mark_stack_ptr++ = ptr;
else
mark_stack_overflow = 1;
}
}
static st_table *source_filenames;
char *
rb_source_filename(f)
const char *f;
{
st_data_t name;
if (!st_lookup(source_filenames, (st_data_t)f, &name)) {
long len = strlen(f) + 1;
char *ptr = ALLOC_N(char, len + 1);
name = (st_data_t)ptr;
*ptr++ = 0;
MEMCPY(ptr, f, char, len);
st_add_direct(source_filenames, (st_data_t)ptr, name);
return ptr;
}
return (char *)name + 1;
}
static void
mark_source_filename(f)
char *f;
{
if (f) {
f[-1] = 1;
}
}
static int
sweep_source_filename(key, value)
char *key, *value;
{
if (*value) {
*value = 0;
return ST_CONTINUE;
}
else {
free(value);
return ST_DELETE;
}
}
#define gc_mark(ptr) rb_gc_mark(ptr)
static void gc_mark_children _((VALUE ptr));
static void
gc_mark_all()
{
RVALUE *p, *pend;
struct heaps_slot *heap = heaps+heaps_used;
init_mark_stack();
while (--heap >= heaps) {
p = heap->slot; pend = p + heap->limit;
while (p < pend) {
if ((p->as.basic.flags & FL_MARK) &&
(p->as.basic.flags != FL_MARK)) {
gc_mark_children((VALUE)p);
}
p++;
}
}
}
static void
gc_mark_rest()
{
size_t stackLen = mark_stack_ptr - mark_stack;
#ifdef nativeAllocA
VALUE *tmp_arry = nativeAllocA(stackLen*sizeof(VALUE));
#else
VALUE tmp_arry[MARK_STACK_MAX];
#endif
VALUE *p = tmp_arry + stackLen;
MEMCPY(tmp_arry, mark_stack, VALUE, stackLen);
init_mark_stack();
while(--p >= tmp_arry) gc_mark_children(*p);
}
static inline int
is_pointer_to_heap(ptr)
void *ptr;
{
RVALUE *p = RANY(ptr);
struct heaps_slot *heap;
if (p < lomem || p > himem || (VALUE)p % sizeof(RVALUE)) return Qfalse;
/* check if p looks like a pointer */
heap = heaps+heaps_used;
while (--heap >= heaps)
if (p >= heap->slot && p < heap->slot + heap->limit)
return Qtrue;
return Qfalse;
}
static void
mark_locations_array(x, n)
VALUE *x;
size_t n;
{
VALUE v;
while (n--) {
v = *x;
if (is_pointer_to_heap((void *)v)) {
gc_mark(v);
}
x++;
}
}
inline void
rb_gc_mark_locations(start, end)
VALUE *start, *end;
{
mark_locations_array(start,end - start);
}
static int
mark_entry(key, value)
ID key;
VALUE value;
{
gc_mark(value);
return ST_CONTINUE;
}
void
rb_mark_tbl(tbl)
st_table *tbl;
{
if (!tbl) return;
st_foreach(tbl, mark_entry, 0);
}
#define mark_tbl(tbl) rb_mark_tbl(tbl)
static int
mark_key(key, value)
VALUE key, value;
{
gc_mark(key);
return ST_CONTINUE;
}
void
rb_mark_set(tbl)
st_table *tbl;
{
if (!tbl) return;
st_foreach(tbl, mark_key, 0);
}
static int
mark_keyvalue(key, value)
VALUE key;
VALUE value;
{
gc_mark(key);
gc_mark(value);
return ST_CONTINUE;
}
void
rb_mark_hash(tbl)
st_table *tbl;
{
if (!tbl) return;
st_foreach(tbl, mark_keyvalue, 0);
}
#define mark_hash(tbl) rb_mark_hash(tbl)
void
rb_gc_mark_maybe(obj)
VALUE obj;
{
if (is_pointer_to_heap((void *)obj)) {
gc_mark(obj);
}
}
void
rb_gc_mark(ptr)
VALUE ptr;
{
RVALUE *obj = RANY(ptr);
SET_STACK_END;
if (rb_special_const_p(ptr)) return; /* special const not marked */
if (obj->as.basic.flags == 0) return; /* free cell */
if (obj->as.basic.flags & FL_MARK) return; /* already marked */
obj->as.basic.flags |= FL_MARK;
if (__stack_past(gc_stack_limit, STACK_END))
push_mark_stack(ptr);
else{
gc_mark_children(ptr);
}
}
static void
gc_mark_children(ptr)
VALUE ptr;
{
RVALUE *obj = RANY(ptr);
goto marking; /* skip */
again:
obj = RANY(ptr);
if (rb_special_const_p(ptr)) return; /* special const not marked */
if (obj->as.basic.flags == 0) return; /* free cell */
if (obj->as.basic.flags & FL_MARK) return; /* already marked */
obj->as.basic.flags |= FL_MARK;
marking:
if (FL_TEST(obj, FL_EXIVAR)) {
rb_mark_generic_ivar(ptr);
}
switch (obj->as.basic.flags & T_MASK) {
case T_NIL:
case T_FIXNUM:
rb_bug("rb_gc_mark() called for broken object");
break;
case T_NODE:
mark_source_filename(obj->as.node.nd_file);
switch (nd_type(obj)) {
case NODE_IF: /* 1,2,3 */
case NODE_FOR:
case NODE_ITER:
case NODE_CREF:
case NODE_WHEN:
case NODE_MASGN:
case NODE_RESCUE:
case NODE_RESBODY:
case NODE_CLASS:
gc_mark((VALUE)obj->as.node.u2.node);
/* fall through */
case NODE_BLOCK: /* 1,3 */
case NODE_ARRAY:
case NODE_DSTR:
case NODE_DXSTR:
case NODE_DREGX:
case NODE_DREGX_ONCE:
case NODE_FBODY:
case NODE_ENSURE:
case NODE_CALL:
case NODE_DEFS:
case NODE_OP_ASGN1:
gc_mark((VALUE)obj->as.node.u1.node);
/* fall through */
case NODE_SUPER: /* 3 */
case NODE_FCALL:
case NODE_DEFN:
case NODE_NEWLINE:
ptr = (VALUE)obj->as.node.u3.node;
goto again;
case NODE_WHILE: /* 1,2 */
case NODE_UNTIL:
case NODE_AND:
case NODE_OR:
case NODE_CASE:
case NODE_SCLASS:
case NODE_DOT2:
case NODE_DOT3:
case NODE_FLIP2:
case NODE_FLIP3:
case NODE_MATCH2:
case NODE_MATCH3:
case NODE_OP_ASGN_OR:
case NODE_OP_ASGN_AND:
case NODE_MODULE:
case NODE_ALIAS:
case NODE_VALIAS:
case NODE_ARGS:
gc_mark((VALUE)obj->as.node.u1.node);
/* fall through */
case NODE_METHOD: /* 2 */
case NODE_NOT:
case NODE_GASGN:
case NODE_LASGN:
case NODE_DASGN:
case NODE_DASGN_CURR:
case NODE_IASGN:
case NODE_CVDECL:
case NODE_CVASGN:
case NODE_COLON3:
case NODE_OPT_N:
case NODE_EVSTR:
case NODE_UNDEF:
ptr = (VALUE)obj->as.node.u2.node;
goto again;
case NODE_HASH: /* 1 */
case NODE_LIT:
case NODE_STR:
case NODE_XSTR:
case NODE_DEFINED:
case NODE_MATCH:
case NODE_RETURN:
case NODE_BREAK:
case NODE_NEXT:
case NODE_YIELD:
case NODE_COLON2:
case NODE_SPLAT:
case NODE_TO_ARY:
case NODE_SVALUE:
ptr = (VALUE)obj->as.node.u1.node;
goto again;
case NODE_SCOPE: /* 2,3 */
case NODE_BLOCK_PASS:
case NODE_CDECL:
gc_mark((VALUE)obj->as.node.u3.node);
ptr = (VALUE)obj->as.node.u2.node;
goto again;
case NODE_ZARRAY: /* - */
case NODE_ZSUPER:
case NODE_CFUNC:
case NODE_VCALL: