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/**********************************************************************

gc.c -

$Author: matz $
$Date: 2002/09/06 08:59:38 $
created at: Tue Oct 5 09:44:46 JST 1993

Copyright (C) 1993-2002 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

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. */
#ifndef __GNUC__
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
# pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
void *alloca ();
# endif
# endif
# endif
#endif

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;

    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;
    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);
    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 DJGPP
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)
# 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
#ifdef __sparc__
# define STACK_LENGTH (rb_gc_stack_start - STACK_END + 0x80)
#else
# define STACK_LENGTH ((STACK_END < rb_gc_stack_start) ? rb_gc_stack_start - STACK_END\
: STACK_END - rb_gc_stack_start)
#endif

#define CHECK_STACK(ret) do {\
SET_STACK_END;\
(ret) = (STACK_LENGTH > STACK_LEVEL_MAX);\
} while (0)

int
ruby_stack_length(p)
    VALUE **p;
{
    SET_STACK_END;
    if (p) *p = 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 void rb_gc_mark_children(VALUE ptr);

static st_table *source_filenames;

char *
rb_source_filename(f)
    const char *f;
{
    char *name;

    if (!st_lookup(source_filenames, f, &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, ptr, name);
return ptr;
    }
    return name + 1;
}

static void
mark_source_filename(f)
    char *f;
{
    if (f) {
f[-1] = 1;
    }
}

static enum st_retval
sweep_source_filename(key, value)
    char *key, *value;
{
    if (*value) {
*value = 0;
return ST_CONTINUE;
    }
    else {
free(value);
return ST_DELETE;
    }
}

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;

    if (start > end) {
tmp = start;
start = end;
end = tmp;
    }
    n = end - start + 1;
    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_hashentry(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_hashentry, 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 = 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;
}
}
    }
    else {
rb_gc_mark_children(ptr);
    }
}

void
rb_gc_mark_children(ptr)
    VALUE ptr;
{
    register RVALUE *obj = RANY(ptr);
    
    if (FL_TEST(obj, FL_EXIVAR)) {
rb_mark_generic_ivar((VALUE)obj);
    }

    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:
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:
rb_gc_mark((VALUE)obj->as.node.u3.node);
break;

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:
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_CDECL:
case NODE_CVDECL:
case NODE_CVASGN:
case NODE_MODULE:
case NODE_COLON3:
case NODE_OPT_N:
case NODE_EVSTR:
rb_gc_mark((VALUE)obj->as.node.u2.node);
break;

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:
rb_gc_mark((VALUE)obj->as.node.u1.node);
break;

case NODE_SCOPE: /* 2,3 */
case NODE_CLASS:
case NODE_BLOCK_PASS:
rb_gc_mark((VALUE)obj->as.node.u3.node);
rb_gc_mark((VALUE)obj->as.node.u2.node);
break;

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);
rb_gc_mark((VALUE)obj->as.node.u2.node);
break;
#endif

default:
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_gc_mark(obj->as.klass.super);
rb_mark_tbl(obj->as.klass.m_tbl);
rb_mark_tbl(obj->as.klass.iv_tbl);
break;

      case T_ARRAY:
if (FL_TEST(obj, ELTS_SHARED)) {
rb_gc_mark(obj->as.array.aux.shared);
}
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);
rb_gc_mark(obj->as.hash.ifnone);
break;

      case T_STRING:
#define STR_ASSOC FL_USER3 /* copied from string.c */
if (FL_TEST(obj, ELTS_SHARED|STR_ASSOC)) {
rb_gc_mark(obj->as.string.aux.shared);
}
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) {
rb_gc_mark((VALUE)obj->as.match.str);
}
break;

      case T_VARMAP:
rb_gc_mark(obj->as.varmap.val);
rb_gc_mark((VALUE)obj->as.varmap.next);
break;

      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);
vars++;
}
}
break;

      case T_STRUCT:
{
long i, len = obj->as.rstruct.len;
VALUE *ptr = obj->as.rstruct.ptr;

for (i=0; i < len; i++)
rb_gc_mark(*ptr++);
}
break;

      default:
rb_bug("rb_gc_mark(): unknown data type 0x%x(0x%x) %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, used = heaps_used;

    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 < 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 < used; i++) {
int n = 0;

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;
}
p++;
}
freed += n;
    }
    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);
p->as.free.flags = 0;
p->as.free.next = freelist;
freelist = p;
}
    }
}

void
rb_gc_force_recycle(p)
    VALUE p;
{
    RANY(p)->as.free.flags = 0;
    RANY(p)->as.free.next = freelist;
    freelist = RANY(p);
}

static void
obj_free(obj)
    VALUE obj;
{
    switch (RANY(obj)->as.basic.flags & T_MASK) {
      case T_NIL:
      case T_FIXNUM:
      case T_TRUE:
      case T_FALSE:
rb_bug("obj_free() called for broken object");
break;
    }

    if (FL_TEST(obj, FL_EXIVAR)) {
rb_free_generic_ivar((VALUE)obj);
    }

    switch (RANY(obj)->as.basic.flags & T_MASK) {
      case T_OBJECT:
if (RANY(obj)->as.object.iv_tbl) {
st_free_table(RANY(obj)->as.object.iv_tbl);
}
break;
      case T_MODULE:
      case T_CLASS:
st_free_table(RANY(obj)->as.klass.m_tbl);
if (RANY(obj)->as.object.iv_tbl) {
st_free_table(RANY(obj)->as.object.iv_tbl);
}
break;
      case T_STRING:
if (RANY(obj)->as.string.ptr && !FL_TEST(obj, ELTS_SHARED)) {
RUBY_CRITICAL(free(RANY(obj)->as.string.ptr));
}
break;
      case T_ARRAY:
if (RANY(obj)->as.array.ptr && !FL_TEST(obj, ELTS_SHARED)) {
RUBY_CRITICAL(free(RANY(obj)->as.array.ptr));
}
break;
      case T_HASH:
if (RANY(obj)->as.hash.tbl) {
st_free_table(RANY(obj)->as.hash.tbl);
}
break;
      case T_REGEXP:
if (RANY(obj)->as.regexp.ptr) {
re_free_pattern(RANY(obj)->as.regexp.ptr);
}
if (RANY(obj)->as.regexp.str) {
RUBY_CRITICAL(free(RANY(obj)->as.regexp.str));
}
break;
      case T_DATA:
if (DATA_PTR(obj)) {
if ((long)RANY(obj)->as.data.dfree == -1) {
RUBY_CRITICAL(free(DATA_PTR(obj)));
}
else if (RANY(obj)->as.data.dfree) {
(*RANY(obj)->as.data.dfree)(DATA_PTR(obj));
}
}
break;
      case T_MATCH:
if (RANY(obj)->as.match.regs) {
re_free_registers(RANY(obj)->as.match.regs);
RUBY_CRITICAL(free(RANY(obj)->as.match.regs));
}
break;
      case T_FILE:
if (RANY(obj)->as.file.fptr) {
rb_io_fptr_finalize(RANY(obj)->as.file.fptr);
RUBY_CRITICAL(free(RANY(obj)->as.file.fptr));
}
break;
      case T_ICLASS:
/* iClass shares table with the module */
break;

      case T_FLOAT:
      case T_VARMAP:
      case T_BLKTAG:
break;

      case T_BIGNUM:
if (RANY(obj)->as.bignum.digits) {
RUBY_CRITICAL(free(RANY(obj)->as.bignum.digits));
}
break;
      case T_NODE:
switch (nd_type(obj)) {
case NODE_SCOPE:
if (RANY(obj)->as.node.u1.tbl) {
RUBY_CRITICAL(free(RANY(obj)->as.node.u1.tbl));
}
break;
#ifdef C_ALLOCA
case NODE_ALLOCA:
RUBY_CRITICAL(free(RANY(obj)->as.node.u1.node));
break;
#endif
}
return; /* no need to free iv_tbl */

      case T_SCOPE:
if (RANY(obj)->as.scope.local_vars &&
            RANY(obj)->as.scope.flags != SCOPE_ALLOCA) {
VALUE *vars = RANY(obj)->as.scope.local_vars-1;
if (vars[0] == 0)
RUBY_CRITICAL(free(RANY(obj)->as.scope.local_tbl));
if (RANY(obj)->as.scope.flags & SCOPE_MALLOC)
RUBY_CRITICAL(free(vars));
}
break;

      case T_STRUCT:
if (RANY(obj)->as.rstruct.ptr) {
RUBY_CRITICAL(free(RANY(obj)->as.rstruct.ptr));
}
break;

      default:
rb_bug("gc_sweep(): unknown data type 0x%x(%d)", obj,
RANY(obj)->as.basic.flags & T_MASK);
    }
}

void
rb_gc_mark_frame(frame)
    struct FRAME *frame;
{
    mark_locations_array(frame->argv, frame->argc);
    rb_gc_mark(frame->cbase);
}

#ifdef __GNUC__
#if defined(__human68k__) || defined(DJGPP)
#if defined(__human68k__)
typedef unsigned long rb_jmp_buf[8];
__asm__ (".even\n\
_rb_setjmp:\n\
move.l 4(sp),a0\n\
movem.l d3-d7/a3-a5,(a0)\n\
moveq.l #0,d0\n\
rts");
#ifdef setjmp
#undef setjmp
#endif
#else
#if defined(DJGPP)
typedef unsigned long rb_jmp_buf[6];
__asm__ (".align 4\n\
_rb_setjmp:\n\
pushl %ebp\n\
movl %esp,%ebp\n\
movl 8(%ebp),%ebp\n\
movl %eax,(%ebp)\n\
movl %ebx,4(%ebp)\n\
movl %ecx,8(%ebp)\n\
movl %edx,12(%ebp)\n\
movl %esi,16(%ebp)\n\
movl %edi,20(%ebp)\n\
popl %ebp\n\
xorl %eax,%eax\n\
ret");
#endif
#endif
int rb_setjmp (rb_jmp_buf);
#define jmp_buf rb_jmp_buf
#define setjmp rb_setjmp
#endif /* __human68k__ or DJGPP */
#endif /* __GNUC__ */

void
rb_gc()
{
    struct gc_list *list;
    struct FRAME * volatile frame; /* gcc 2.7.2.3 -O2 bug?? */
    jmp_buf save_regs_gc_mark;
    SET_STACK_END;

    if (dont_gc || during_gc) {
if (!freelist) {
add_heap();
}
return;
    }

    if (during_gc) return;
    during_gc++;

    init_mark_stack();
    
    /* mark frame stack */
    for (frame = ruby_frame; frame; frame = frame->prev) {
rb_gc_mark_frame(frame);
if (frame->tmp) {
struct FRAME *tmp = frame->tmp;
while (tmp) {
rb_gc_mark_frame(tmp);
tmp = tmp->prev;
}
}
    }
    rb_gc_mark((VALUE)ruby_class);
    rb_gc_mark((VALUE)ruby_scope);
    rb_gc_mark((VALUE)ruby_dyna_vars);
    if (finalizer_table) {
rb_mark_tbl(finalizer_table);
    }

    FLUSH_REGISTER_WINDOWS;
    /* This assumes that all registers are saved into the jmp_buf */
    setjmp(save_regs_gc_mark);
    mark_locations_array((VALUE*)save_regs_gc_mark, sizeof(save_regs_gc_mark) / sizeof(VALUE *));
    rb_gc_mark_locations(rb_gc_stack_start, (VALUE*)STACK_END);
#if defined(__human68k__)
    rb_gc_mark_locations((VALUE*)((char*)rb_gc_stack_start + 2),
(VALUE*)((char*)STACK_END + 2));
#endif
    rb_gc_mark_threads();

    /* mark protected global variables */
    for (list = global_List; list; list = list->next) {
rb_gc_mark(*list->varptr);
    }
    rb_mark_end_proc();
    rb_gc_mark_global_tbl();

    rb_mark_tbl(rb_class_tbl);
    rb_gc_mark_trap_list();

    /* mark generic instance variables for special constants */
    rb_mark_generic_ivar_tbl();

    rb_gc_mark_parser();
    
    /* gc_mark objects whose marking are not completed*/
    while (!MARK_STACK_EMPTY){
if (mark_stack_overflow){
gc_mark_all();
}
else {
gc_mark_rest();
}
    }
    gc_sweep();
}

VALUE
rb_gc_start()
{
    rb_gc();
    return Qnil;
}

void
Init_stack(addr)
    VALUE *addr;
{
#if defined(__human68k__)
    extern void *_SEND;
    rb_gc_stack_start = _SEND;
#else
    VALUE start;

    if (!addr) addr = &start;
    rb_gc_stack_start = addr;
#endif
#ifdef HAVE_GETRLIMIT
    {
struct rlimit rlim;

if (getrlimit(RLIMIT_STACK, &rlim) == 0) {
double space = (double)rlim.rlim_cur*0.2;

if (space > 1024*1024) space = 1024*1024;
STACK_LEVEL_MAX = (rlim.rlim_cur - space) / sizeof(VALUE);
}
    }
#endif
}

void
Init_heap()
{
    if (!rb_gc_stack_start) {
Init_stack(0);
    }
    add_heap();
}

static VALUE
os_live_obj()
{
    int i;
    int n = 0;

    for (i = 0; i < heaps_used; i++) {
RVALUE *p, *pend;

p = heaps[i]; pend = p + heaps_limits[i];
for (;p < pend; p++) {
if (p->as.basic.flags) {
switch (TYPE(p)) {
case T_ICLASS:
case T_VARMAP:
case T_SCOPE:
case T_NODE:
continue;
case T_CLASS:
if (FL_TEST(p, FL_SINGLETON)) continue;
default:
if (!p->as.basic.klass) continue;
rb_yield((VALUE)p);
n++;
}
}
}
    }

    return INT2FIX(n);
}

static VALUE
os_obj_of(of)
    VALUE of;
{
    int i;
    int n = 0;

    for (i = 0; i < heaps_used; i++) {
RVALUE *p, *pend;

p = heaps[i]; pend = p + heaps_limits[i];
for (;p < pend; p++) {
if (p->as.basic.flags) {
switch (TYPE(p)) {
case T_ICLASS:
case T_VARMAP:
case T_SCOPE:
case T_NODE:
continue;
case T_CLASS:
if (FL_TEST(p, FL_SINGLETON)) continue;
default:
if (!p->as.basic.klass) continue;
if (rb_obj_is_kind_of((VALUE)p, of)) {
rb_yield((VALUE)p);
n++;
}
}
}
}
    }

    return INT2FIX(n);
}

static VALUE
os_each_obj(argc, argv)
    int argc;
    VALUE *argv;
{
    VALUE of;

    if (rb_scan_args(argc, argv, "01", &of) == 0) {
return os_live_obj();
    }
    else {
return os_obj_of(of);
    }
}

static VALUE finalizers;

static VALUE
add_final(os, proc)
    VALUE os, proc;
{
    rb_warn("ObjectSpace::add_finalizer is deprecated; use define_finalizer");
    if (!rb_obj_is_kind_of(proc, rb_cProc)) {
rb_raise(rb_eArgError, "wrong type argument %s (Proc required)",
rb_class2name(CLASS_OF(proc)));
    }
    rb_ary_push(finalizers, proc);
    return proc;
}

static VALUE
rm_final(os, proc)
    VALUE os, proc;
{
    rb_warn("ObjectSpace::remove_finalizer is deprecated; use undefine_finalizer");
    rb_ary_delete(finalizers, proc);
    return proc;
}

static VALUE
finals()
{
    rb_warn("ObjectSpace::finalizers is deprecated");
    return finalizers;
}

static VALUE
call_final(os, obj)
    VALUE os, obj;
{
    rb_warn("ObjectSpace::call_finalizer is deprecated; use define_finalizer");
    need_call_final = 1;
    FL_SET(obj, FL_FINALIZE);
    return obj;
}

static VALUE
undefine_final(os, obj)
    VALUE os, obj;
{
    if (finalizer_table) {
st_delete(finalizer_table, &obj, 0);
    }
    return obj;
}

static VALUE
define_final(argc, argv, os)
    int argc;
    VALUE *argv;
    VALUE os;
{
    VALUE obj, proc, table;

    rb_scan_args(argc, argv, "11", &obj, &proc);
    if (argc == 1) {
proc = rb_f_lambda();
    }
    else if (!rb_obj_is_kind_of(proc, rb_cProc)) {
rb_raise(rb_eArgError, "wrong type argument %s (Proc required)",
rb_class2name(CLASS_OF(proc)));
    }
    need_call_final = 1;
    FL_SET(obj, FL_FINALIZE);

    if (!finalizer_table) {
finalizer_table = st_init_numtable();
    }
    if (st_lookup(finalizer_table, obj, &table)) {
rb_ary_push(table, proc);
    }
    else {
st_add_direct(finalizer_table, obj, rb_ary_new3(1, proc));
    }
    return proc;
}

static VALUE
run_single_final(args)
    VALUE *args;
{
    rb_eval_cmd(args[0], args[1], 0);
    return Qnil;
}

static void
run_final(obj)
    VALUE obj;
{
    long i;
    int status;
    VALUE args[2], table;

    args[1] = rb_ary_new3(1, rb_obj_id(obj)); /* make obj into id */
    for (i=0; i<RARRAY(finalizers)->len; i++) {
args[0] = RARRAY(finalizers)->ptr[i];
rb_protect((VALUE(*)_((VALUE)))run_single_final, (VALUE)args, &status);
    }
    if (finalizer_table && st_delete(finalizer_table, &obj, &table)) {
for (i=0; i<RARRAY(table)->len; i++) {
args[0] = RARRAY(table)->ptr[i];
rb_protect((VALUE(*)_((VALUE)))run_single_final, (VALUE)args, &status);
}
    }
}

void
rb_gc_call_finalizer_at_exit()
{
    RVALUE *p, *pend;
    int i;

    /* run finalizers */
    if (need_call_final) {
if (deferred_final_list) {
p = deferred_final_list;
while (p) {
RVALUE *tmp = p;
p = p->as.free.next;
run_final((VALUE)tmp);
}
}
for (i = 0; i < heaps_used; i++) {
p = heaps[i]; pend = p + heaps_limits[i];
while (p < pend) {
if (FL_TEST(p, FL_FINALIZE)) {
FL_UNSET(p, FL_FINALIZE);
p->as.basic.klass = 0;
run_final((VALUE)p);
}
p++;
}
}
    }
    /* run data object's finaliers */
    for (i = 0; i < heaps_used; i++) {
p = heaps[i]; pend = p + heaps_limits[i];
while (p < pend) {
if (BUILTIN_TYPE(p) == T_DATA &&
DATA_PTR(p) && RANY(p)->as.data.dfree) {
p->as.free.flags = 0;
(*RANY(p)->as.data.dfree)(DATA_PTR(p));
}
else if (BUILTIN_TYPE(p) == T_FILE) {
p->as.free.flags = 0;
rb_io_fptr_finalize(RANY(p)->as.file.fptr);
}
p++;
}
    }
}

static VALUE
id2ref(obj, id)
    VALUE obj, id;
{
    unsigned long ptr, p0;

    rb_secure(4);
    p0 = ptr = NUM2ULONG(id);
    if (ptr == Qtrue) return Qtrue;
    if (ptr == Qfalse) return Qfalse;
    if (ptr == Qnil) return Qnil;
    if (FIXNUM_P(ptr)) return (VALUE)ptr;
    if (SYMBOL_P(ptr) && rb_id2name(SYM2ID((VALUE)ptr)) != 0) {
return (VALUE)ptr;
    }

    ptr = id ^ FIXNUM_FLAG; /* unset FIXNUM_FLAG */
    if (!is_pointer_to_heap((void *)ptr)) {
rb_raise(rb_eRangeError, "0x%x is not id value", p0);
    }
    if (BUILTIN_TYPE(ptr) == 0) {
rb_raise(rb_eRangeError, "0x%x is recycled object", p0);
    }
    return (VALUE)ptr;
}

void
Init_GC()
{
    VALUE rb_mObSpace;

    rb_mGC = rb_define_module("GC");
    rb_define_singleton_method(rb_mGC, "start", rb_gc_start, 0);
    rb_define_singleton_method(rb_mGC, "enable", rb_gc_enable, 0);
    rb_define_singleton_method(rb_mGC, "disable", rb_gc_disable, 0);
    rb_define_method(rb_mGC, "garbage_collect", rb_gc_start, 0);

    rb_mObSpace = rb_define_module("ObjectSpace");
    rb_define_module_function(rb_mObSpace, "each_object", os_each_obj, -1);
    rb_define_module_function(rb_mObSpace, "garbage_collect", rb_gc_start, 0);
    rb_define_module_function(rb_mObSpace, "add_finalizer", add_final, 1);
    rb_define_module_function(rb_mObSpace, "remove_finalizer", rm_final, 1);
    rb_define_module_function(rb_mObSpace, "finalizers", finals, 0);
    rb_define_module_function(rb_mObSpace, "call_finalizer", call_final, 1);

    rb_define_module_function(rb_mObSpace, "define_finalizer", define_final, -1);
    rb_define_module_function(rb_mObSpace, "undefine_finalizer", undefine_final, 1);

    rb_define_module_function(rb_mObSpace, "_id2ref", id2ref, 1);

    rb_gc_register_address(&rb_mObSpace);
    rb_global_variable(&finalizers);
    rb_gc_unregister_address(&rb_mObSpace);
    finalizers = rb_ary_new();

    source_filenames = st_init_strtable();

    nomem_error = rb_exc_new2(rb_eNoMemError, "failed to allocate memory");
    rb_global_variable(&nomem_error);
}
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