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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_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef __ia64__
#include <ucontext.h>
#pragma weak __libc_ia64_register_backing_store_base
extern unsigned long __libc_ia64_register_backing_store_base;
#endif
void re_free_registers _((struct re_registers*));
void rb_io_fptr_finalize _((struct OpenFile*));
#if !defined(setjmp) && defined(HAVE__SETJMP)
#define setjmp(env) _setjmp(env)
#endif
/* 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
#if defined(MSDOS) || defined(__human68k__)
#define GC_MALLOC_LIMIT 200000
#else
#define GC_MALLOC_LIMIT 8000000
#endif
#endif
static unsigned long malloc_increase = 0;
static unsigned long malloc_limit = GC_MALLOC_LIMIT;
static void run_final();
static VALUE nomem_error;
void
rb_memerror()
{
static int recurse = 0;
if (recurse > 0 && rb_safe_level() < 4) {
fprintf(stderr, "[FATAL] failed to allocate memory\n");
exit(1);
}
recurse++;
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;
malloc_increase += size;
if (malloc_increase > malloc_limit) {
rb_gc();
}
RUBY_CRITICAL(mem = malloc(size));
if (!mem) {
rb_gc();
RUBY_CRITICAL(mem = malloc(size));
if (!mem) {
rb_memerror();
}
}
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;
malloc_increase += size;
RUBY_CRITICAL(mem = realloc(ptr, size));
if (!mem) {
rb_gc();
RUBY_CRITICAL(mem = realloc(ptr, size));
if (!mem) {
rb_memerror();
}
}
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;
VALUE
rb_gc_enable()
{
int old = dont_gc;
dont_gc = Qfalse;
return old;
}
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;
}
}
void
rb_global_variable(var)
VALUE *var;
{
rb_gc_register_address(var);
}
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;
} RVALUE;
static RVALUE *freelist = 0;
static RVALUE *deferred_final_list = 0;
#define HEAPS_INCREMENT 10
static RVALUE **heaps;
static int heaps_length = 0;
static int heaps_used = 0;
#define HEAP_MIN_SLOTS 10000
static int *heaps_limits;
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 */
heaps_length += HEAPS_INCREMENT;
RUBY_CRITICAL(heaps = (heaps_used>0)?
(RVALUE**)realloc(heaps, heaps_length*sizeof(RVALUE*)):
(RVALUE**)malloc(heaps_length*sizeof(RVALUE*)));
if (heaps == 0) rb_memerror();
RUBY_CRITICAL(heaps_limits = (heaps_used>0)?
(int*)realloc(heaps_limits, heaps_length*sizeof(int)):
(int*)malloc(heaps_length*sizeof(int)));
if (heaps_limits == 0) rb_memerror();
}
for (;;) {
RUBY_CRITICAL(p = heaps[heaps_used] = (RVALUE*)malloc(sizeof(RVALUE)*heap_slots));
heaps_limits[heaps_used] = heap_slots;
if (p == 0) {
if (heap_slots == HEAP_MIN_SLOTS) {
rb_memerror();
}
heap_slots = HEAP_MIN_SLOTS;
continue;
}
break;
}
pend = p + heap_slots;
if (lomem == 0 || lomem > p) lomem = p;
if (himem < pend) himem = pend;
heaps_used++;
heap_slots *= 1.8;
while (p < pend) {
p->as.free.flags = 0;
p->as.free.next = freelist;
freelist = p;
p++;
}
}
#define RANY(o) ((RVALUE*)(o))
VALUE
rb_newobj()
{
VALUE obj;
if (!freelist) rb_gc();
obj = (VALUE)freelist;
freelist = freelist->as.free.next;
MEMZERO((void*)obj, RVALUE, 1);
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);
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;
#if defined(DJGPP) || defined(_WIN32_WCE)
static unsigned int STACK_LEVEL_MAX = 65535;
#else
#ifdef __human68k__
extern unsigned int _stacksize;
# define STACK_LEVEL_MAX (_stacksize - 4096)
# undef HAVE_GETRLIMIT
#else
#ifdef HAVE_GETRLIMIT
static unsigned int STACK_LEVEL_MAX = 655300;
#else
# define STACK_LEVEL_MAX 655300
#endif
#endif
#endif
#ifdef C_ALLOCA
# define SET_STACK_END VALUE stack_end; alloca(0);
# define STACK_END (&stack_end)
#else
# if defined(__GNUC__) && defined(USE_BUILTIN_FRAME_ADDRESS) && !defined(__ia64__)
# define SET_STACK_END VALUE *stack_end = __builtin_frame_address(0)
# else
# define SET_STACK_END VALUE *stack_end = alloca(1)
# endif
# define STACK_END (stack_end)
#endif
#if defined(sparc) || defined(__sparc__)
# define STACK_LENGTH (rb_gc_stack_start - STACK_END + 0x80)
#elif STACK_GROW_DIRECTION < 0
# define STACK_LENGTH (rb_gc_stack_start - STACK_END)
#elif STACK_GROW_DIRECTION > 0
# define STACK_LENGTH (STACK_END - rb_gc_stack_start + 1)
#else
# define STACK_LENGTH ((STACK_END < rb_gc_stack_start) ? rb_gc_stack_start - STACK_END\
: STACK_END - rb_gc_stack_start + 1)
#endif
#if STACK_GROW_DIRECTION > 0
# define STACK_UPPER(x, a, b) a
#elif STACK_GROW_DIRECTION < 0
# define STACK_UPPER(x, a, b) b
#else
static int
stack_growup_p(addr)
VALUE *addr;
{
SET_STACK_END;
if (STACK_END > addr) return Qtrue;
return Qfalse;
}
# define STACK_UPPER(x, a, b) (stack_growup_p(x) ? a : b)
#endif
#define GC_WARTER_MARK 512
#define CHECK_STACK(ret) do {\
SET_STACK_END;\
(ret) = (STACK_LENGTH > STACK_LEVEL_MAX + GC_WARTER_MARK);\
} while (0)
int
ruby_stack_length(p)
VALUE **p;
{
SET_STACK_END;
if (p) *p = STACK_UPPER(STACK_END, rb_gc_stack_start, STACK_END);
return STACK_LENGTH;
}
int
ruby_stack_check()
{
int ret;
CHECK_STACK(ret);
return ret;
}
#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 st_table *source_filenames;
char *
rb_source_filename(f)
const char *f;
{
char *name;
if (!st_lookup(source_filenames, (st_data_t)f, (st_data_t *)&name)) {
long len = strlen(f) + 1;
char *ptr = name = ALLOC_N(char, len + 1);
*ptr++ = 0;
MEMCPY(ptr, f, char, len);
st_add_direct(source_filenames, (st_data_t)ptr, (st_data_t)name);
return ptr;
}
return 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;
}
}
static void rb_gc_mark_children _((VALUE ptr));
static void
gc_mark_all()
{
RVALUE *p, *pend;
int i;
init_mark_stack();
for (i = 0; i < heaps_used; i++) {
p = heaps[i]; pend = p + heaps_limits[i];
while (p < pend) {
if ((p->as.basic.flags & FL_MARK) &&
(p->as.basic.flags != FL_MARK)) {
rb_gc_mark_children((VALUE)p);
}
p++;
}
}
}
static void
gc_mark_rest()
{
VALUE tmp_arry[MARK_STACK_MAX];
VALUE *p;
p = (mark_stack_ptr - mark_stack) + tmp_arry;
MEMCPY(tmp_arry, mark_stack, VALUE, MARK_STACK_MAX);
init_mark_stack();
while(p != tmp_arry){
p--;
rb_gc_mark_children(*p);
}
}
static inline int
is_pointer_to_heap(ptr)
void *ptr;
{
register RVALUE *p = RANY(ptr);
register RVALUE *heap_org;
register long i;
if (p < lomem || p > himem) return Qfalse;
/* check if p looks like a pointer */
for (i=0; i < heaps_used; i++) {
heap_org = heaps[i];
if (heap_org <= p && p < heap_org + heaps_limits[i] &&
((((char*)p)-((char*)heap_org))%sizeof(RVALUE)) == 0)
return Qtrue;
}
return Qfalse;
}
static void
mark_locations_array(x, n)
register VALUE *x;
register long n;
{
while (n--) {
if (is_pointer_to_heap((void *)*x)) {
rb_gc_mark(*x);
}
x++;
}
}
void
rb_gc_mark_locations(start, end)
VALUE *start, *end;
{
VALUE *tmp;
long n;
n = end - start;
mark_locations_array(start,n);
}
static int
mark_entry(key, value)
ID key;
VALUE value;
{
rb_gc_mark(value);
return ST_CONTINUE;
}
void
rb_mark_tbl(tbl)
st_table *tbl;
{
if (!tbl) return;
st_foreach(tbl, mark_entry, 0);
}
static int
mark_keyvalue(key, value)
VALUE key;
VALUE value;
{
rb_gc_mark(key);
rb_gc_mark(value);
return ST_CONTINUE;
}
void
rb_mark_hash(tbl)
st_table *tbl;
{
if (!tbl) return;
st_foreach(tbl, mark_keyvalue, 0);
}
void
rb_gc_mark_maybe(obj)
VALUE obj;
{
if (is_pointer_to_heap((void *)obj)) {
rb_gc_mark(obj);
}
}
void
rb_gc_mark(ptr)
VALUE ptr;
{
int ret;
register RVALUE *obj;
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;
CHECK_STACK(ret);
if (ret) {
if (!mark_stack_overflow) {
if (mark_stack_ptr - mark_stack < MARK_STACK_MAX) {
*mark_stack_ptr = ptr;
mark_stack_ptr++;
}
else {
mark_stack_overflow = 1;
}
}
return;
}
rb_gc_mark_children(ptr);
}
static void
rb_gc_mark_children(ptr)
VALUE ptr;
{
register 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:
rb_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:
rb_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:
rb_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:
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_ARGS:
case NODE_SPLAT:
case NODE_SVALUE:
ptr = (VALUE)obj->as.node.u1.node;
goto again;
case NODE_SCOPE: /* 2,3 */
case NODE_BLOCK_PASS:
case NODE_CDECL:
rb_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:
case NODE_GVAR:
case NODE_LVAR:
case NODE_DVAR:
case NODE_IVAR:
case NODE_CVAR:
case NODE_NTH_REF:
case NODE_BACK_REF:
case NODE_ALIAS:
case NODE_VALIAS:
case NODE_REDO:
case NODE_RETRY:
case NODE_UNDEF:
case NODE_SELF:
case NODE_NIL:
case NODE_TRUE:
case NODE_FALSE:
case NODE_ATTRSET:
case NODE_BLOCK_ARG:
case NODE_POSTEXE:
break;
#ifdef C_ALLOCA
case NODE_ALLOCA:
mark_locations_array((VALUE*)obj->as.node.u1.value,
obj->as.node.u3.cnt);
ptr = (VALUE)obj->as.node.u2.node;
goto again;
#endif
default: /* unlisted NODE */
if (is_pointer_to_heap(obj->as.node.u1.node)) {
rb_gc_mark((VALUE)obj->as.node.u1.node);
}
if (is_pointer_to_heap(obj->as.node.u2.node)) {
rb_gc_mark((VALUE)obj->as.node.u2.node);
}
if (is_pointer_to_heap(obj->as.node.u3.node)) {
rb_gc_mark((VALUE)obj->as.node.u3.node);
}
}
return; /* no need to mark class. */
}
rb_gc_mark(obj->as.basic.klass);
switch (obj->as.basic.flags & T_MASK) {
case T_ICLASS:
case T_CLASS:
case T_MODULE:
rb_mark_tbl(obj->as.klass.m_tbl);
rb_mark_tbl(obj->as.klass.iv_tbl);
ptr = obj->as.klass.super;
goto again;
case T_ARRAY:
if (FL_TEST(obj, ELTS_SHARED)) {
ptr = obj->as.array.aux.shared;
goto again;
}
else {
long i, len = obj->as.array.len;
VALUE *ptr = obj->as.array.ptr;
for (i=0; i < len; i++) {
rb_gc_mark(*ptr++);
}
}
break;
case T_HASH:
rb_mark_hash(obj->as.hash.tbl);
ptr = obj->as.hash.ifnone;
goto again;
case T_STRING:
#define STR_ASSOC FL_USER3 /* copied from string.c */
if (FL_TEST(obj, ELTS_SHARED|STR_ASSOC)) {
ptr = obj->as.string.aux.shared;
goto again;
}
break;
case T_DATA:
if (obj->as.data.dmark) (*obj->as.data.dmark)(DATA_PTR(obj));
break;
case T_OBJECT:
rb_mark_tbl(obj->as.object.iv_tbl);
break;
case T_FILE:
case T_REGEXP:
case T_FLOAT:
case T_BIGNUM:
case T_BLKTAG:
break;
case T_MATCH:
if (obj->as.match.str) {
ptr = obj->as.match.str;
goto again;
}
break;
case T_VARMAP:
rb_gc_mark(obj->as.varmap.val);
ptr = (VALUE)obj->as.varmap.next;
goto again;
case T_SCOPE:
if (obj->as.scope.local_vars && (obj->as.scope.flags & SCOPE_MALLOC)) {
int n = obj->as.scope.local_tbl[0]+1;
VALUE *vars = &obj->as.scope.local_vars[-1];
while (n--) {
rb_gc_mark(*vars++);
}
}
break;
case T_STRUCT:
{
long len = obj->as.rstruct.len;
VALUE *ptr = obj->as.rstruct.ptr;
while (len--) {
rb_gc_mark(*ptr++);
}
}
break;
default:
rb_bug("rb_gc_mark(): unknown data type 0x%lx(0x%lx) %s",
obj->as.basic.flags & T_MASK, obj,
is_pointer_to_heap(obj) ? "corrupted object" : "non object");
}
}
static void obj_free _((VALUE));
static void
gc_sweep()
{
RVALUE *p, *pend, *final_list;
int freed = 0;
int i, j;
unsigned long live = 0;
if (ruby_in_compile && ruby_parser_stack_on_heap()) {
/* should not reclaim nodes during compilation
if yacc's semantic stack is not allocated on machine stack */
for (i = 0; i < heaps_used; i++) {
p = heaps[i]; pend = p + heaps_limits[i];
while (p < pend) {
if (!(p->as.basic.flags&FL_MARK) && BUILTIN_TYPE(p) == T_NODE)
rb_gc_mark((VALUE)p);
p++;
}
}
}
mark_source_filename(ruby_sourcefile);
st_foreach(source_filenames, sweep_source_filename, 0);
freelist = 0;
final_list = deferred_final_list;
deferred_final_list = 0;
for (i = 0; i < heaps_used; i++) {
int n = 0;
RVALUE *free = freelist;
RVALUE *final = final_list;
p = heaps[i]; pend = p + heaps_limits[i];
while (p < pend) {
if (!(p->as.basic.flags & FL_MARK)) {
if (p->as.basic.flags) {
obj_free((VALUE)p);
}
if (need_call_final && FL_TEST(p, FL_FINALIZE)) {
p->as.free.flags = FL_MARK; /* remain marked */
p->as.free.next = final_list;
final_list = p;
}
else {
p->as.free.flags = 0;
p->as.free.next = freelist;
freelist = p;
}
n++;
}
else if (RBASIC(p)->flags == FL_MARK) {
/* objects to be finalized */
/* do notning remain marked */
}
else {
RBASIC(p)->flags &= ~FL_MARK;
live++;
}
p++;
}
if (n == heaps_limits[i] && freed + n > FREE_MIN) {
RVALUE *pp;
heaps_limits[i] = 0;
for (pp = final_list; pp != final; pp = pp->as.free.next) {
p->as.free.flags |= FL_SINGLETON; /* freeing page mark */
}
freelist = free; /* cancel this page from freelist */
}
else {
freed += n;
}
}
malloc_limit += (malloc_increase - malloc_limit) * (double)live / (live + freed);
if (malloc_limit < GC_MALLOC_LIMIT) malloc_limit = GC_MALLOC_LIMIT;
malloc_increase = 0;
if (freed < FREE_MIN) {
add_heap();
}
during_gc = 0;
/* clear finalization list */
if (final_list) {
RVALUE *tmp;
if (rb_prohibit_interrupt || ruby_in_compile) {
deferred_final_list = final_list;
return;
}
for (p = final_list; p; p = tmp) {
tmp = p->as.free.next;
run_final((VALUE)p);
if (!FL_TEST(p, FL_SINGLETON)) { /* not freeing page */
p->as.free.flags = 0;
p->as.free.next = freelist;
freelist = p;