/ext/gc_bmp/gc_bmp.c

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

  gc_bmp.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.h"
#include "ruby/re.h"
#include "ruby/io.h"
#include <stdio.h>
#include <setjmp.h>
#include <sys/types.h>

#ifndef FALSE
# define FALSE 0
#elif FALSE
# error FALSE must be false
#endif
#ifndef TRUE
# define TRUE 1
#elif !TRUE
# error TRUE must be true
#endif

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif

#if defined _WIN32 || defined __CYGWIN__
#include <windows.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

int rb_io_fptr_finalize(struct rb_io_t*);

#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 MARK_STACK_MAX 1024

/* for GC profile */
#define GC_PROFILE_MORE_DETAIL 1
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;

    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 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.count++;\
	}\
    } while(0)

#if GC_PROFILE_MORE_DETAIL
#define INIT_GC_PROF_PARAMS double gc_time = 0, mark_time = 0, sweep_time = 0;\
    size_t count = objspace->profile.count

#define GC_PROF_MARK_TIMER_START 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[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 do {\
	if (objspace->profile.run) {\
	    gc_profile_record *record = &objspace->profile.record[objspace->profile.count];\
	    record->heap_use_slots = heaps_used;\
	    record->heap_live_objects = live;\
	    record->heap_free_objects = freed; \
	    record->heap_total_objects = heaps_used * HEAP_OBJ_LIMIT;\
	    record->have_finalize = final_list ? Qtrue : Qfalse;\
	    record->heap_use_size = live * sizeof(RVALUE); \
	    record->heap_total_size = heaps_used * (HEAP_OBJ_LIMIT * sizeof(RVALUE));\
	}\
    } while(0)
#else
#define INIT_GC_PROF_PARAMS double gc_time = 0;\
    size_t count = objspace->profile.count
#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 do {\
	if (objspace->profile.run) {\
	    gc_profile_record *record = &objspace->profile.record[objspace->profile.count];\
	    record->heap_total_objects = heaps_used * HEAP_OBJ_LIMIT;\
	    record->heap_use_size = live * sizeof(RVALUE); \
	    record->heap_total_size = heaps_used * HEAP_SIZE;\
	}\
    } while(0)
#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 {
	    VALUE flags;
	    struct RVALUE *next;
	    int *map;
	    VALUE slot;
	    int limit;
	} bitmap;
	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 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;
    RVALUE *bitmap;
};

#define HEAP_MIN_SLOTS 10000
#define FREE_MIN  4096

struct gc_list {
    VALUE *varptr;
    struct gc_list *next;
};

#define CALC_EXACT_MALLOC_SIZE 0

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;
	size_t length;
	size_t used;
	RVALUE *freelist;
	RVALUE *range[2];
	RVALUE *freed;
    } heap;
    struct {
	int dont_gc;
	int during_gc;
    } 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;
    unsigned int count;
    int gc_stress;

    struct {
	RVALUE *freed_bitmap;
    } ext_heap;
} rb_objspace_t;

#define malloc_limit		objspace->malloc_params.limit
#define malloc_increase 	objspace->malloc_params.increase
#define heap_slots		objspace->heap.slots
#define heaps			objspace->heap.ptr
#define heaps_length		objspace->heap.length
#define heaps_used		objspace->heap.used
#define freelist		objspace->heap.freelist
#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 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 need_call_final 	(finalizer_table && finalizer_table->num_entries)

static void rb_objspace_call_finalizer(rb_objspace_t *objspace);

#include "ruby/gc_ext.h"
static rb_gc_inner_t *gc_inner;

/* TODO: more suitable and safety expression */
#define T_BITMAP (T_FIXNUM + 1)
#define FL_ALIGNOFF FL_MARK

static rb_objspace_t *
rb_objspace_alloc_tmp(void)
{
    rb_objspace_t *objspace = malloc(sizeof(rb_objspace_t));
    memset(objspace, 0, sizeof(*objspace));
    malloc_limit = GC_MALLOC_LIMIT;

    return objspace;
}

static void
rb_objspace_free_tmp(rb_objspace_t *objspace)
{
    rb_objspace_call_finalizer(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;
	    free(list);
	}
    }
    if (heaps) {
	size_t i;
	for (i = 0; i < heaps_used; ++i) {
	    free(heaps[i].membase);
	}
	free(heaps);
	heaps_used = 0;
	heaps = 0;
    }
    free(objspace);
}

/* tiny heap size */
/* 32KB */
/*#define HEAP_SIZE 0x8000 */
/* 128KB */
/*#define HEAP_SIZE 0x20000 */
/* 64KB */
/*#define HEAP_SIZE 0x10000 */
/* 16KB */
#define BITMAP_ALIGN 0x4000
/* 8KB */
/*#define HEAP_SIZE 0x2000 */
/* 4KB */
/*#define HEAP_SIZE 0x1000 */
/* 2KB */
/*#define HEAP_SIZE 0x800 */

#define HEAP_SIZE ((BITMAP_ALIGN / sizeof(struct RVALUE) + 2) * sizeof(RVALUE))
#define BITMAP_MASK  (0xFFFFFFFF - BITMAP_ALIGN + 1)
#define HEAP_OBJ_LIMIT (HEAP_SIZE / sizeof(struct RVALUE) - 1)

extern VALUE rb_cMutex;
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);

/*
 *  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 = gc_inner->get_objspace();
    return ruby_gc_stress ? Qtrue : Qfalse;
}

/*
 *  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(VALUE self, VALUE flag)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    rb_secure(2);
    ruby_gc_stress = RTEST(flag);
    return flag;
}

/*
 *  call-seq:
 *    GC::Profiler.enable?                 => true or false
 *
 *  returns current status of GC profile mode.
 */

static VALUE
gc_profile_enable_get(VALUE self)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    return objspace->profile.run;
}

/*
 *  call-seq:
 *    GC::Profiler.enable          => nil
 *
 *  updates GC profile mode.
 *  start profiler for GC.
 *
 */

static VALUE
gc_profile_enable(void)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();

    objspace->profile.run = TRUE;
    return Qnil;
}

/*
 *  call-seq:
 *    GC::Profiler.disable          => nil
 *
 *  updates GC profile mode.
 *  stop profiler for GC.
 *
 */

static VALUE
gc_profile_disable(void)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();

    objspace->profile.run = FALSE;
    return Qnil;
}

/*
 *  call-seq:
 *    GC::Profiler.clear          => nil
 *
 *  clear before profile data.
 *
 */

static VALUE
gc_profile_clear(void)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    MEMZERO(objspace->profile.record, gc_profile_record, objspace->profile.size);
    objspace->profile.count = 0;
    return Qnil;
}

static void vm_xfree(rb_objspace_t *objspace, void *ptr);

static void *
vm_xmalloc(rb_objspace_t *objspace, size_t size)
{
    void *mem;

    if ((ssize_t)size < 0) {
	gc_inner->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) {
	gc_inner->garbage_collect_with_gvl(objspace);
    }
    mem = malloc(size);
    if (!mem) {
	if (gc_inner->garbage_collect_with_gvl(objspace)) {
	    mem = malloc(size);
	}
	if (!mem) {
	    gc_inner->ruby_memerror();
	}
    }
    malloc_increase += size;

#if CALC_EXACT_MALLOC_SIZE
    objspace->malloc_params.allocated_size += size;
    objspace->malloc_params.allocations++;
    ((size_t *)mem)[0] = size;
    mem = (size_t *)mem + 1;
#endif

    return mem;
}

static void *
vm_xrealloc(rb_objspace_t *objspace, void *ptr, size_t size)
{
    void *mem;

    if ((ssize_t)size < 0) {
	gc_inner->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)
	gc_inner->garbage_collect_with_gvl(objspace);

#if CALC_EXACT_MALLOC_SIZE
    size += sizeof(size_t);
    objspace->malloc_params.allocated_size -= size;
    ptr = (size_t *)ptr - 1;
#endif

    mem = realloc(ptr, size);
    if (!mem) {
	if (gc_inner->garbage_collect_with_gvl(objspace)) {
	    mem = realloc(ptr, size);
	}
	if (!mem) {
	    gc_inner->ruby_memerror();
        }
    }
    malloc_increase += size;

#if CALC_EXACT_MALLOC_SIZE
    objspace->malloc_params.allocated_size += size;
    ((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];
    objspace->malloc_params.allocated_size -= size;
    objspace->malloc_params.allocations--;
#endif

    free(ptr);
}

static void *
ruby_xmalloc_tmp(size_t size)
{
    return vm_xmalloc(gc_inner->get_objspace(), size);
}

static void *
ruby_xmalloc2_tmp(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 vm_xmalloc(gc_inner->get_objspace(), len);
}

static void *
ruby_xcalloc_tmp(size_t n, size_t size)
{
    void *mem = ruby_xmalloc2(n, size);
    memset(mem, 0, n * size);

    return mem;
}

static void *
ruby_xrealloc_tmp(void *ptr, size_t size)
{
    return vm_xrealloc(gc_inner->get_objspace(), ptr, size);
}

static void *
ruby_xrealloc2_tmp(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);
}

static void
ruby_xfree_tmp(void *x)
{
    if (x)
	vm_xfree(gc_inner->get_objspace(), x);
}


/*
 *  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
 *
 */

static VALUE
rb_gc_enable_tmp(void)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    int old = dont_gc;

    dont_gc = FALSE;
    return old ? Qtrue : Qfalse;
}

/*
 *  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
 *
 */

static VALUE
rb_gc_disable_tmp(void)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    int old = dont_gc;

    dont_gc = TRUE;
    return old ? Qtrue : Qfalse;
}

extern VALUE rb_mGC;

static void
rb_gc_register_address_tmp(VALUE *addr)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    struct gc_list *tmp;

    tmp = ALLOC(struct gc_list);
    tmp->next = global_List;
    tmp->varptr = addr;
    global_List = tmp;
}

static void
rb_gc_unregister_address_tmp(VALUE *addr)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    struct gc_list *tmp = global_List;

    if (tmp->varptr == addr) {
	global_List = tmp->next;
	xfree(tmp);
	return;
    }
    while (tmp->next) {
	if (tmp->next->varptr == addr) {
	    struct gc_list *t = tmp->next;

	    tmp->next = tmp->next->next;
	    xfree(t);
	    break;
	}
	tmp = tmp->next;
    }
}


static void
allocate_heaps(rb_objspace_t *objspace, size_t next_heaps_length)
{
    struct heaps_slot *p;
    size_t size;

    size = next_heaps_length*sizeof(struct heaps_slot);

    if (heaps_used > 0) {
	p = (struct heaps_slot *)realloc(heaps, size);
	if (p) heaps = p;
    }
    else {
	p = heaps = (struct heaps_slot *)malloc(size);
    }

    if (p == 0) {
	during_gc = 0;
	rb_memerror();
    }
    heaps_length = next_heaps_length;
}


#define FIND_BITMAP(res, p) do {\
    if (((RVALUE *)p)->as.free.flags & FL_ALIGNOFF) {\
        res = (RVALUE *)((((VALUE)p & BITMAP_MASK) + BITMAP_ALIGN) / sizeof(RVALUE) * sizeof(RVALUE)); \
    }\
    else {\
        res = (RVALUE *)(((VALUE)p & BITMAP_MASK) / sizeof(RVALUE) * sizeof(RVALUE));\
    }\
} while(0)

#define NUM_IN_SLOT(p, slot) (((VALUE)p - (VALUE)slot)/sizeof(RVALUE))
#define BITMAP_INDEX(bmap, p) (NUM_IN_SLOT(p, bmap->as.bitmap.slot) / (sizeof(int) * 8))
/* #define BITMAP_INDEX(bmap, p) (NUM_IN_SLOT(p, bmap->as.bitmap.slot) >> 5) */
#define BITMAP_OFFSET(bmap, p) (NUM_IN_SLOT(p, bmap->as.bitmap.slot) & ((sizeof(int) * 8)-1))
#define MARKED_IN_BITMAP(bmap, p) (bmap->as.bitmap.map[BITMAP_INDEX(bmap, p)] & 1 << BITMAP_OFFSET(bmap, p))
#define MARK_IN_BITMAP(bmap, p) (bmap->as.bitmap.map[BITMAP_INDEX(bmap, p)] |= 1 << BITMAP_OFFSET(bmap, p))
#define CLEAR_IN_BITMAP(bmap, p) (bmap->as.bitmap.map[BITMAP_INDEX(bmap, p)] &= ~(1 << BITMAP_OFFSET(bmap, p)))
#define MARKED_IN_BITMAP_DIRECT(map, index, offset) (map[index] & 1 << offset)
#define MARK_IN_BITMAP_DIRECT(map, index, offset) (map[index] |= 1 << offset)

/* for debug */
void
bitmap_p(RVALUE *p)
{
    RVALUE *bmap;
    int index, offset, marked;

    FIND_BITMAP(bmap, p);
    index = BITMAP_INDEX(bmap, p);
    offset = BITMAP_OFFSET(bmap, p);
    marked = MARKED_IN_BITMAP(bmap, p);
    printf("bitmap : ((RVALUE *)%p)\n", bmap);
    printf("map_index : %d | offset : %d\n", index, offset);
    printf("is mark ? %s\n", marked? "true" : "false");
}

VALUE
find_bitmap(RVALUE *p) {
    RVALUE *res;

    FIND_BITMAP(res, p);
    return (VALUE)res;
}

void
dump_bitmap(RVALUE *bmap) {
    int i;
    
    for (i = 0; i < 26; i++) {
	printf("dump %p map %d : %d %s\n", bmap, i, bmap->as.bitmap.map[i], bmap->as.bitmap.map[i]? "remain" : "clean");
    }
}

void
bitmap2obj(RVALUE *bmap, int index, int offset)
{
    printf("(RVALUE *)%p\n", (RVALUE *)(bmap->as.bitmap.slot + (index * sizeof(int) * 8 + offset) * sizeof(RVALUE)));
}


static void
make_bitmap(struct heaps_slot *slot)
{
    RVALUE *p, *pend, *bitmap, *last, *border;
    int *map = 0;
    int size;
   
    p = slot->slot;
    pend = p + slot->limit;
    last = pend - 1;
    RBASIC(last)->flags = 0;
    FIND_BITMAP(bitmap, last);
    if (bitmap < p || pend <= bitmap) {
	rb_bug("not include in heap slot: result bitmap(%p), find (%p), p (%p), pend(%p)", bitmap, last, p, pend);
    }
    border = bitmap;
    if (!((VALUE)border % BITMAP_ALIGN)) {
	border--;
    }
    while (p < pend) {
	if (p <= border) {
	    RBASIC(p)->flags = FL_ALIGNOFF;
	}
	else {
	    RBASIC(p)->flags = 0;
	}
	p++;
    }

    size = sizeof(int) * (HEAP_OBJ_LIMIT / (sizeof(int) * 8)+1);
    map = (int *)malloc(size);
    if (map == 0) {
	rb_memerror();
    }
    MEMZERO(map, int, (size/sizeof(int)));
    bitmap->as.bitmap.flags |= T_BITMAP;
    bitmap->as.bitmap.map = map;
    bitmap->as.bitmap.slot = (VALUE)slot->slot;
    bitmap->as.bitmap.limit = slot->limit;
    slot->bitmap = bitmap;
}

void
test_bitmap(RVALUE *p, RVALUE *pend)
{
    RVALUE *first, *bmap = 0, *bmap_tmp;
    int i;

    first = p;
    FIND_BITMAP(bmap_tmp, p);
    while (p < pend) {
	if (MARKED_IN_BITMAP(bmap, p)) printf("already marking! %p\n", p);
	if (bmap_tmp != p) {
	    FIND_BITMAP(bmap, p);
	    if (bmap_tmp != bmap) printf("diffrence bmap %p : %p\n", bmap_tmp, bmap);
	    MARK_IN_BITMAP(bmap, p);
	}
	else {
	    MARK_IN_BITMAP(bmap, p);
	}
	if (!MARKED_IN_BITMAP(bmap, p)) printf("not marking! %p\n", p);
	p++;
    }
    for (i =0; i < 26; i++) {
	printf("bitmap[%d] : %x\n", i, bmap->as.bitmap.map[i]);
    }
    p = first;
    while (p < pend) {
	if (bmap_tmp != p) {
	    FIND_BITMAP(bmap, p);
	    CLEAR_IN_BITMAP(bmap, p);
	}
	else {
	    CLEAR_IN_BITMAP(bmap, p);
	}
	if (MARKED_IN_BITMAP(bmap, p)) printf("not clear! %p\n", p);
	p++;
    }
    for (i =0; i < 26; i++) {
	printf("bitmap[%d] : %x\n", i, bmap->as.bitmap.map[i]);
    }
}

static void
assign_heap_slot(rb_objspace_t *objspace)
{
    RVALUE *p, *pend, *membase;
    size_t hi, lo, mid;
    size_t objs;

    objs = HEAP_OBJ_LIMIT;
    p = (RVALUE*)malloc(HEAP_SIZE);

    if (p == 0) {
	during_gc = 0;
	rb_memerror();
    }

    membase = p;
    if ((VALUE)p % sizeof(RVALUE) != 0) {
	p = (RVALUE*)((VALUE)p + sizeof(RVALUE) - ((VALUE)p % sizeof(RVALUE)));
    }

    lo = 0;
    hi = heaps_used;
    while (lo < hi) {
	register RVALUE *mid_membase;
	mid = (lo + hi) / 2;
	mid_membase = heaps[mid].membase;
	if (mid_membase < membase) {
	    lo = mid + 1;
	}
	else if (mid_membase > membase) {
	    hi = mid;
	}
	else {
	    rb_bug("same heap slot is allocated: %p at %"PRIuVALUE, (void *)membase, (VALUE)mid);
	}
    }
    if (hi < heaps_used) {
	MEMMOVE(&heaps[hi+1], &heaps[hi], struct heaps_slot, heaps_used - hi);
    }
    heaps[hi].membase = membase;
    heaps[hi].slot = p;
    heaps[hi].limit = objs;
    pend = p + objs;
    if (lomem == 0 || lomem > p) lomem = p;
    if (himem < pend) himem = pend;
    heaps_used++;

    make_bitmap(&heaps[hi]);
    while (p < pend) {
	if (BUILTIN_TYPE(p) != T_BITMAP) {
	    p->as.free.next = freelist;
	    freelist = p;
	}
	p++;
    }
}

static void
init_heap(rb_objspace_t *objspace)
{
    size_t add, i;

    add = HEAP_MIN_SLOTS / HEAP_OBJ_LIMIT;

    if (!add) {
        add = 1;
    }

    if ((heaps_used + add) > heaps_length) {
        allocate_heaps(objspace, heaps_used + add);
    }

    for (i = 0; i < add; i++) {
        assign_heap_slot(objspace);
    }
    heaps_inc = 0;
    objspace->profile.invoke_time = getrusage_time();
}


static void
set_heaps_increment(rb_objspace_t *objspace)
{
    size_t next_heaps_length = (size_t)(heaps_used * 1.8);

    if (next_heaps_length == heaps_used) {
        next_heaps_length++;
    }

    heaps_inc = next_heaps_length - heaps_used;

    if (next_heaps_length > heaps_length) {
	allocate_heaps(objspace, next_heaps_length);
    }
}

static int
heaps_increment(rb_objspace_t *objspace)
{
    if (heaps_inc > 0) {
        assign_heap_slot(objspace);
	heaps_inc--;
	return TRUE;
    }
    return FALSE;
}

#define RANY(o) ((RVALUE*)(o))

static VALUE
rb_newobj_from_heap(rb_objspace_t *objspace)
{
    VALUE obj;
    int bmap_left = 0;

    if ((ruby_gc_stress && !ruby_disable_gc_stress) || !freelist) {
	if (!heaps_increment(objspace) && !garbage_collect(objspace)) {
	    during_gc = 0;
	    rb_memerror();
	}
    }

    obj = (VALUE)freelist;
    freelist = freelist->as.free.next;

    if (RANY(obj)->as.free.flags & FL_ALIGNOFF) {
	bmap_left = Qtrue;
    }
    MEMZERO((void*)obj, RVALUE, 1);
    if (bmap_left) {
	RANY(obj)->as.free.flags = FL_ALIGNOFF;
    }
#ifdef GC_DEBUG
    RANY(obj)->file = rb_sourcefile();
    RANY(obj)->line = rb_sourceline();
#endif

    return obj;
}

/* TODO: remove this function. */
#if USE_VALUE_CACHE
static VALUE
rb_fill_value_cache(rb_thread_t *th)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    int i;
    VALUE rv;
    RVALUE *bmap;

    /* LOCK */
    for (i=0; i<RUBY_VM_VALUE_CACHE_SIZE; i++) {
	VALUE v = rb_newobj_from_heap(objspace);

	th->value_cache[i] = v;
	FIND_BITMAP(bmap, v);
	MARK_IN_BITMAP(bmap, v);
    }
    th->value_cache_ptr = &th->value_cache[0];
    rv = rb_newobj_from_heap(objspace);
    /* UNLOCK */
    return rv;
}
#endif

static int
rb_during_gc_tmp(void)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    return during_gc;
}

static VALUE
rb_newobj_tmp(void)
{
#if USE_VALUE_CACHE
    rb_thread_t *th = GET_THREAD();
    VALUE v = *th->value_cache_ptr;
#endif
    rb_objspace_t *objspace = gc_inner->get_objspace();

    if (during_gc) {
	dont_gc = 1;
	during_gc = 0;
	rb_bug("object allocation during garbage collection phase");
    }

#if USE_VALUE_CACHE
    if (v) {
	rb_set_flag_force(v, 0);
	th->value_cache_ptr++;
    }
    else {
	v = rb_fill_value_cache(th);
    }

#if defined(GC_DEBUG)
    printf("cache index: %d, v: %p, th: %p\n",
	   th->value_cache_ptr - th->value_cache, v, th);
#endif
    return v;
#else
    return rb_newobj_from_heap(objspace);
#endif
}

static void
rb_set_flag_force_tmp(VALUE obj, VALUE t)
{
    t = t & ~FL_ALIGNOFF;
    if (RBASIC(obj)->flags & FL_ALIGNOFF) {
	RBASIC(obj)->flags = FL_ALIGNOFF | t;
    }
    else {
	RBASIC(obj)->flags = t;
    }
}

static VALUE
rb_data_object_alloc_tmp(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;
}

static VALUE
rb_data_typed_object_alloc_tmp(VALUE klass, void *datap, 
				   const rb_data_type_t *type)
{
    NEWOBJ(data, struct RTypedData);

    if (klass) Check_Type(klass, T_CLASS);

    OBJSETUP(data, klass, T_DATA);

    data->data = datap;
    data->typed_flag = 1;
    data->type = type;

    return (VALUE)data;
}

static size_t
rb_objspace_data_type_memsize_tmp(VALUE obj)
{
    if (RTYPEDDATA_P(obj)) {
	return RTYPEDDATA_TYPE(obj)->dsize(RTYPEDDATA_DATA(obj));
    }
    else {
	return 0;
    }
}

static const char *
rb_objspace_data_type_name_tmp(VALUE obj)
{
    if (RTYPEDDATA_P(obj)) {
	return RTYPEDDATA_TYPE(obj)->wrap_struct_name;
    }
    else {
	return 0;
    }
}

#ifdef __ia64
#define SET_STACK_END (SET_MACHINE_STACK_END(&th->machine_stack_end), th->machine_register_stack_end = rb_ia64_bsp())
#else
#define SET_STACK_END SET_MACHINE_STACK_END(&th->machine_stack_end)
#endif

#define STACK_START (th->machine_stack_start)
#define STACK_END (th->machine_stack_end)
#define STACK_LEVEL_MAX (th->machine_stack_maxsize/sizeof(VALUE))

#if STACK_GROW_DIRECTION < 0
# define STACK_LENGTH  (size_t)(STACK_START - STACK_END)
#elif STACK_GROW_DIRECTION > 0
# define STACK_LENGTH  (size_t)(STACK_END - STACK_START + 1)
#else
# define STACK_LENGTH  ((STACK_END < STACK_START) ? (size_t)(STACK_START - STACK_END) \
			: (size_t)(STACK_END - STACK_START + 1))
#endif
#if !STACK_GROW_DIRECTION
int ruby_stack_grow_direction;
static int
ruby_get_stack_grow_direction_tmp(volatile VALUE *addr)
{
    VALUE *end;
    SET_MACHINE_STACK_END(&end);

    if (end > addr) return ruby_stack_grow_direction = 1;
    return ruby_stack_grow_direction = -1;
}
#endif

#define GC_WATER_MARK 512

static int
ruby_stack_check_tmp(void)
{
#if defined(POSIX_SIGNAL) && defined(SIGSEGV) && defined(HAVE_SIGALTSTACK)
    return 0;
#else
    return gc_inner->stack_check();
#endif
}

static void
init_mark_stack(rb_objspace_t *objspace)
{
    mark_stack_overflow = 0;
    mark_stack_ptr = mark_stack;
}

#define MARK_STACK_EMPTY (mark_stack_ptr == mark_stack)

static void gc_mark(rb_objspace_t *objspace, VALUE ptr, int lev);

#define IS_FREE_CELL(obj) ((obj->as.basic.flags & ~(FL_ALIGNOFF)) == 0)

static void
gc_mark_all(rb_objspace_t *objspace)
{
    RVALUE *p, *pend, *bmap;
    size_t i;

    init_mark_stack(objspace);
    for (i = 0; i < heaps_used; i++) {
	p = heaps[i].slot; pend = p + heaps[i].limit;
	bmap = heaps[i].bitmap;
	while (p < pend) {
	    if (MARKED_IN_BITMAP(bmap, p) &&
		!(IS_FREE_CELL(p))) {
		gc_inner->gc_mark_children(objspace, (VALUE)p, 0);
	    }
	    p++;
	}
    }
}

static void
gc_mark_rest(rb_objspace_t *objspace)
{
    VALUE tmp_arry[MARK_STACK_MAX];
    VALUE *p;

    p = (mark_stack_ptr - mark_stack) + tmp_arry;
    MEMCPY(tmp_arry, mark_stack, VALUE, p - tmp_arry);

    init_mark_stack(objspace);
    while (p != tmp_arry) {
	p--;
	gc_inner->gc_mark_children(objspace, *p, 0);
    }
}

static inline int
is_pointer_to_heap(rb_objspace_t *objspace, void *ptr)
{
    register RVALUE *p = RANY(ptr);
    register struct heaps_slot *heap;
    register size_t hi, lo, mid;

    if (p < lomem || p > himem) return FALSE;
    if ((VALUE)p % sizeof(RVALUE) != 0) return FALSE;

    /* check if p looks like a pointer using bsearch*/
    lo = 0;
    hi = heaps_used;
    while (lo < hi) {
	mid = (lo + hi) / 2;
	heap = &heaps[mid];
	if (heap->slot <= p) {
	    if (p < heap->slot + heap->limit)
		return TRUE;
	    lo = mid + 1;
	}
	else {
	    hi = mid;
	}
    }
    return FALSE;
}

static void
mark_locations_array(rb_objspace_t *objspace, register VALUE *x, register long n)
{
    VALUE v;
    while (n--) {
        v = *x;
        VALGRIND_MAKE_MEM_DEFINED(&v, sizeof(v));
	if (is_pointer_to_heap(objspace, (void *)v)) {
	    gc_mark(objspace, v, 0);
	}
	x++;
    }
}

static void
gc_mark_locations(rb_objspace_t *objspace, VALUE *start, VALUE *end)
{
    long n;

    if (end <= start) return;
    n = end - start;
    mark_locations_array(objspace, start, n);
}

static void
rb_gc_mark_locations_tmp(VALUE *start, VALUE *end)
{
    gc_mark_locations(gc_inner->get_objspace(), start, end);
}

#define rb_gc_mark_locations(start, end) gc_mark_locations(objspace, start, end)

struct mark_tbl_arg {
    rb_objspace_t *objspace;
    int lev;
};

static int
mark_entry(ID key, VALUE value, st_data_t data)
{
    struct mark_tbl_arg *arg = (void*)data;
    gc_mark(arg->objspace, value, arg->lev);
    return ST_CONTINUE;
}

static void
mark_tbl(rb_objspace_t *objspace, st_table *tbl, int lev)
{
    struct mark_tbl_arg arg;
    if (!tbl) return;
    arg.objspace = objspace;
    arg.lev = lev;
    st_foreach(tbl, mark_entry, (st_data_t)&arg);
}

static int
mark_key(VALUE key, VALUE value, st_data_t data)
{
    struct mark_tbl_arg *arg = (void*)data;
    gc_mark(arg->objspace, key, arg->lev);
    return ST_CONTINUE;
}

static void
mark_set(rb_objspace_t *objspace, st_table *tbl, int lev)
{
    struct mark_tbl_arg arg;
    if (!tbl) return;
    arg.objspace = objspace;
    arg.lev = lev;
    st_foreach(tbl, mark_key, (st_data_t)&arg);
}

static void
rb_mark_set_tmp(st_table *tbl)
{
    mark_set(gc_inner->get_objspace(), tbl, 0);
}

static int
mark_keyvalue(VALUE key, VALUE value, st_data_t data)
{
    struct mark_tbl_arg *arg = (void*)data;
    gc_mark(arg->objspace, key, arg->lev);
    gc_mark(arg->objspace, value, arg->lev);
    return ST_CONTINUE;
}

static void
mark_hash(rb_objspace_t *objspace, st_table *tbl, int lev)
{
    struct mark_tbl_arg arg;
    if (!tbl) return;
    arg.objspace = objspace;
    arg.lev = lev;
    st_foreach(tbl, mark_keyvalue, (st_data_t)&arg);
}

static int
mark_method_entry_i(ID key, const rb_method_entry_t *me, st_data_t data)
{
    struct mark_tbl_arg *arg = (void*)data;
    gc_inner->mark_method_entry(arg->objspace, me, arg->lev);
    return ST_CONTINUE;
}

static void
mark_m_tbl(rb_objspace_t *objspace, st_table *tbl, int lev)
{
    struct mark_tbl_arg arg;
    if (!tbl) return;
    arg.objspace = objspace;
    arg.lev = lev;
    st_foreach(tbl, mark_method_entry_i, (st_data_t)&arg);
}

static int
free_method_entry_i(ID key, rb_method_entry_t *me, st_data_t data)
{
    rb_free_method_entry(me);
    return ST_CONTINUE;
}

static void
rb_free_m_table_tmp(st_table *tbl)
{
    st_foreach(tbl, free_method_entry_i, 0);
    st_free_table(tbl);
}

static void
rb_mark_tbl_tmp(st_table *tbl)
{
    mark_tbl(gc_inner->get_objspace(), tbl, 0);
}

static void
rb_gc_mark_maybe_tmp(VALUE obj)
{
    if (is_pointer_to_heap(gc_inner->get_objspace(), (void *)obj)) {
	gc_mark(gc_inner->get_objspace(), obj, 0);
    }
}

#define GC_LEVEL_MAX 250

static void
gc_mark(rb_objspace_t *objspace, VALUE ptr, int lev)
{
    register RVALUE *obj, *bmap;

    obj = RANY(ptr);
    if (rb_special_const_p(ptr)) return; /* special const not marked */
    if (IS_FREE_CELL(obj)) return;       /* free cell */
    if (BUILTIN_TYPE(obj) == T_BITMAP) return;
    FIND_BITMAP(bmap, obj);
    if (MARKED_IN_BITMAP(bmap, obj)) return;  /* already marked */
    MARK_IN_BITMAP(bmap, obj);

    if (lev > GC_LEVEL_MAX || (lev == 0 && gc_inner->stack_check())) {
	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;
    }
    gc_inner->gc_mark_children(objspace, ptr, lev+1);
}

static int
gc_set_mark_flag(register RVALUE *obj)
{
    register RVALUE *bmap;
    if (IS_FREE_CELL(obj)) return 1;       /* free cell */
    FIND_BITMAP(bmap, obj);
    if (MARKED_IN_BITMAP(bmap, obj)) return 1;  /* already marked */
    MARK_IN_BITMAP(bmap, obj);
    return 0;
}

static inline void
add_freelist(rb_objspace_t *objspace, RVALUE *p)
{
    RVALUE *bmap;

    VALGRIND_MAKE_MEM_UNDEFINED((void*)p, sizeof(RVALUE));
    rb_set_flag_force((VALUE)p, 0);
    FIND_BITMAP(bmap, p);
    CLEAR_IN_BITMAP(bmap, p);
    p->as.free.next = freelist;
    freelist = p;
}

static void
finalize_list(rb_objspace_t *objspace, RVALUE *p)
{
    while (p) {
	RVALUE *tmp = p->as.free.next;
	run_final(objspace, (VALUE)p);
	if (!FL_TEST(p, FL_SINGLETON)) { /* not freeing page */
	    add_freelist(objspace, p);
	}
	else {
	    struct heaps_slot *slot = (struct heaps_slot *)RDATA(p)->dmark;
	    slot->limit--;
	}
	p = tmp;
    }
}

static void
free_unused_heaps(rb_objspace_t *objspace)
{
    size_t i, j;
    RVALUE *last = 0, *bmap = 0;

    for (i = j = 1; j < heaps_used; i++) {
	if (heaps[i].limit == 0) {
	    if (!last) {
		last = heaps[i].membase;
		bmap = heaps[i].bitmap;
	    }
	    else {
		free(heaps[i].membase);
		free(heaps[i].bitmap->as.bitmap.map);
	    }
	    heaps_used--;
	}
	else {
	    if (i != j) {
		heaps[j] = heaps[i];
	    }
	    j++;
	}
    }
    if (last) {
	if (last < heaps_freed) {
	    free(heaps_freed);
	    free(objspace->ext_heap.freed_bitmap->as.bitmap.map);
	    heaps_freed = last;
	    heaps_freed = bmap;
	}
	else {
	    free(last);
	    free(bmap->as.bitmap.map);
	}
    }
}

static void
gc_sweep(rb_objspace_t *objspace)
{
    RVALUE *p, *pend, *final_list;
    size_t freed = 0;
    size_t i;
    size_t live = 0, free_min = 0, do_heap_free = 0;

    do_heap_free = (size_t)((heaps_used * HEAP_OBJ_LIMIT) * 0.65);
    free_min = (size_t)((heaps_used * HEAP_OBJ_LIMIT)  * 0.2);

    if (free_min < FREE_MIN) {
	do_heap_free = heaps_used * HEAP_OBJ_LIMIT;
        free_min = FREE_MIN;
    }

    freelist = 0;
    final_list = deferred_final_list;
    deferred_final_list = 0;
    for (i = 0; i < heaps_used; i++) {
	size_t free_num = 0, final_num = 0;
	RVALUE *free = freelist;
	RVALUE *final = final_list;
	int *map = heaps[i].bitmap->as.bitmap.map;
	int deferred, bmap_index = 0, bmap_offset = 0;

	p = heaps[i].slot; pend = p + heaps[i].limit;
	while (p < pend) {
	    if (BUILTIN_TYPE(p) == T_BITMAP) {
		free_num++;
	    }
	    else if(!(MARKED_IN_BITMAP_DIRECT(map, bmap_index, bmap_offset))) {
		if (!(IS_FREE_CELL(p)) &&
		    ((deferred = gc_inner->obj_free(objspace, (VALUE)p)) ||
		     ((FL_TEST(p, FL_FINALIZE)) && need_call_final))) {
		    if (!deferred) {
			rb_set_flag_force((VALUE)p, T_ZOMBIE);
			RDATA(p)->dfree = 0;
		    }
		    p->as.free.next = final_list;
		    final_list = p;
		    final_num++;
		}
		else {
		    /* Do not touch the fields if they don't have to be modified.
		     * This is in order to preserve copy-on-write semantics.
		     */
		    if (!IS_FREE_CELL(p))
			rb_set_flag_force((VALUE)p, 0);
		    if (p->as.free.next != freelist)
			p->as.free.next = freelist;
		    freelist = p;
		    free_num++;
		}
	    }
	    else if (BUILTIN_TYPE(p) == T_ZOMBIE) {
		/* objects to be finalized */
		/* do nothing remain marked */
	    }
	    else {
		live++;
	    }
	    p++;
	    bmap_offset++;
	    if (bmap_offset >= (int)(sizeof(int) * 8)) {
		bmap_index++;
		bmap_offset = 0;
	    }
	}
	MEMZERO(heaps[i].bitmap->as.bitmap.map, int, bmap_index+1);
	if (final_num + free_num == heaps[i].limit && freed > do_heap_free) {
	    RVALUE *pp;

	    for (pp = final_list; pp != final; pp = pp->as.free.next) {
		RDATA(pp)->dmark = (void *)&heaps[i];
		pp->as.free.flags |= FL_SINGLETON; /* freeing page mark */
	    }
	    heaps[i].limit = final_num;

	    freelist = free;	/* cancel this page from freelist */
	}
	else {
	    freed += free_num;
	}
    }
    GC_PROF_SET_MALLOC_INFO;
    if (malloc_increase > malloc_limit) {
	malloc_limit += (size_t)((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) {
        set_heaps_increment(objspace);
        heaps_increment(objspace);
    }
    during_gc = 0;

    /* clear finalization list */
    if (final_list) {
	RVALUE *bmap, *pp;
	for (pp = final_list; pp != 0; pp = pp->as.free.next) {
	    FIND_BITMAP(bmap, pp);
	    MARK_IN_BITMAP(bmap, pp);
	}
	GC_PROF_SET_HEAP_INFO;
	deferred_final_list = final_list;
	gc_inner->ruby_vm_set_finalizer_interrupt();
    }
    else {
	free_unused_heaps(objspace);
	GC_PROF_SET_HEAP_INFO;
    }
}

static void
rb_gc_force_recycle_tmp(VALUE p)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    add_freelist(objspace, (RVALUE *)p);
}

static inline void
make_deferred(RVALUE *p)
{
    rb_set_flag_force((VALUE)p, (p->as.basic.flags & ~T_MASK) | T_ZOMBIE);
}

static inline void
make_io_deferred(RVALUE *p)
{
    rb_io_t *fptr = p->as.file.fptr;
    make_deferred(p);
    p->as.data.dfree = (void (*)(void*))rb_io_fptr_finalize;
    p->as.data.data = fptr;
}

#define GC_NOTIFY 0

void rb_vm_mark(void *ptr);

#if STACK_GROW_DIRECTION < 0
#define GET_STACK_BOUNDS(start, end, appendix) (start = STACK_END, end = STACK_START)
#elif STACK_GROW_DIRECTION > 0
#define GET_STACK_BOUNDS(start, end, appendix) (start = STACK_START, end = STACK_END+appendix)
#else
#define GET_STACK_BOUNDS(stack_start, stack_end, appendix) \
    ((STACK_END < STACK_START) ? \
     (start = STACK_END, end = STACK_START) : (start = STACK_START, end = STACK_END+appendix))
#endif

void rb_gc_mark_encodings(void);

static int
garbage_collect(rb_objspace_t *objspace)
{
    struct gc_list *list;
    INIT_GC_PROF_PARAMS;

    if (GC_NOTIFY) printf("start garbage_collect()\n");

    if (!heaps) {
	return FALSE;
    }

    if (dont_gc || during_gc) {
	if (!freelist) {
            if (!heaps_increment(objspace)) {
                set_heaps_increment(objspace);
                heaps_increment(objspace);
            }
	}
	return TRUE;
    }
    during_gc++;
    objspace->count++;

    GC_PROF_TIMER_START;
    GC_PROF_MARK_TIMER_START;

    gc_inner->gc_mark_core(objspace);

    if (finalizer_table) {
	mark_tbl(objspace, finalizer_table, 0);
    }

    rb_gc_mark_threads();
    rb_gc_mark_symbols();
    rb_gc_mark_encodings();

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

    mark_tbl(objspace, rb_class_tbl, 0);

    /* 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(objspace);
	}
	else {
	    gc_mark_rest(objspace);
	}
    }
    GC_PROF_MARK_TIMER_STOP;

    GC_PROF_SWEEP_TIMER_START;
    gc_sweep(objspace);
    GC_PROF_SWEEP_TIMER_STOP;

    GC_PROF_TIMER_STOP;
    if (GC_NOTIFY) printf("end garbage_collect()\n");
    return TRUE;
}

static int
rb_garbage_collect_tmp(void)
{
    return garbage_collect(gc_inner->get_objspace());
}

/*
 * Document-class: ObjectSpace
 *
 *  The <code>ObjectSpace</code> module contains a number of routines
 *  that interact with the garbage collection facility and allow you to
 *  traverse all living objects with an iterator.
 *
 *  <code>ObjectSpace</code> also provides support for object
 *  finalizers, procs that will be called when a specific object is
 *  about to be destroyed by garbage collection.
 *
 *     include ObjectSpace
 *
 *
 *     a = "A"
 *     b = "B"
 *     c = "C"
 *
 *
 *     define_finalizer(a, proc {|id| puts "Finalizer one on #{id}" })
 *     define_finalizer(a, proc {|id| puts "Finalizer two on #{id}" })
 *     define_finalizer(b, proc {|id| puts "Finalizer three on #{id}" })
 *
 *  <em>produces:</em>
 *
 *     Finalizer three on 537763470
 *     Finalizer one on 537763480
 *     Finalizer two on 537763480
 *
 */

static void
Init_heap_tmp(void)
{
    init_heap(gc_inner->get_objspace());
}

/*
 * rb_objspace_each_objects() is special C API to walk through
 * Ruby object space.  This C API is too difficult to use it.
 * To be frank, you should not use it. Or you need to read the
 * source code of this function and understand what this function does.
 *
 * 'callback' will be called several times (the number of heap slot,
 * at current implementation) with:
 *   vstart: a pointer to the first living object of the heap_slot.
 *   vend: a pointer to next to the valid heap_slot area.
 *   stride: a distance to next VALUE.
 *
 * If callback() returns non-zero, the iteration will be stopped.
 *
 * This is a sample callback code to iterate liveness objects:
 *
 *   int
 *   sample_callback(void *vstart, void *vend, int stride, void *data) {
 *     VALUE v = (VALUE)vstart;
 *     for (; v != (VALUE)vend; v += stride) {
 *       if (RBASIC(v)->flags) { // liveness check
 *       // do something with live object 'v'
 *     }
 *     return 0; // continue to iteration
 *   }
 *
 * Note: 'vstart' is not a top of heap_slot.  This point the first
 *       living object to grasp at least one object to avoid GC issue.
 *       This means that you can not walk through all Ruby object slot
 *       including freed object slot.
 *
 * Note: On this implementation, 'stride' is same as sizeof(RVALUE).
 *       However, there are possibilities to pass variable values with
 *       'stride' with some reasons.  You must use stride instead of
 *       use some constant value in the iteration.
 */
static void
rb_objspace_each_objects_tmp(int (*callback)(void *vstart, void *vend,
						 size_t stride, void *d),
				 void *data)
{
    size_t i;
    RVALUE *membase = 0;
    RVALUE *pstart, *pend;
    rb_objspace_t *objspace = gc_inner->get_objspace();
    volatile VALUE v;

    i = 0;
    while (i < heaps_used) {
	while (0 < i && (uintptr_t)membase < (uintptr_t)heaps[i-1].membase)
	  i--;
	while (i < heaps_used && (uintptr_t)heaps[i].membase <= (uintptr_t)membase )
	  i++;
	if (heaps_used <= i)
	  break;
	membase = heaps[i].membase;

	pstart = heaps[i].slot;
	pend = pstart + heaps[i].limit;

	for (; pstart != pend; pstart++) {
	    if (pstart->as.basic.flags & ~FL_ALIGNOFF) {
		v = (VALUE)pstart; /* acquire to save this object */
		break;
	    }
	}
	if (pstart != pend) {
	    if ((*callback)(pstart, pend, sizeof(RVALUE), data)) {
		return;
	    }
	}
    }

    return;
}

struct os_each_struct {
    size_t num;
    VALUE of;
};

static int
os_obj_of_i(void *vstart, void *vend, size_t stride, void *data)
{
    struct os_each_struct *oes = (struct os_each_struct *)data;
    RVALUE *p = (RVALUE *)vstart, *pend = (RVALUE *)vend;
    volatile VALUE v;

    for (; p != pend; p++) {
	if (!IS_FREE_CELL(p)) {
	    if (gc_inner->os_obj_of_check_type(p)) {
		if (BUILTIN_TYPE(p) == T_BITMAP) continue;
		if (!p->as.basic.klass) continue;
		v = (VALUE)p;
		if (!oes->of || rb_obj_is_kind_of(v, oes->of)) {
		    rb_yield(v);
		    oes->num++;
		}
	    }
	}
    }

    return 0;
}

static VALUE
os_obj_of(VALUE of)
{
    struct os_each_struct oes;

    oes.num = 0;
    oes.of = of;
    rb_objspace_each_objects(os_obj_of_i, &oes);
    return SIZET2NUM(oes.num);
}

/*
 *  call-seq:
 *     ObjectSpace.each_object([module]) {|obj| ... } => fixnum
 *
 *  Calls the block once for each living, nonimmediate object in this
 *  Ruby process. If <i>module</i> is specified, calls the block
 *  for only those classes or modules that match (or are a subclass of)
 *  <i>module</i>. Returns the number of objects found. Immediate
 *  objects (<code>Fixnum</code>s, <code>Symbol</code>s
 *  <code>true</code>, <code>false</code>, and <code>nil</code>) are
 *  never returned. In the example below, <code>each_object</code>
 *  returns both the numbers we defined and several constants defined in
 *  the <code>Math</code> module.
 *
 *     a = 102.7
 *     b = 95       # Won't be returned
 *     c = 12345678987654321
 *     count = ObjectSpace.each_object(Numeric) {|x| p x }
 *     puts "Total count: #{count}"
 *
 *  <em>produces:</em>
 *
 *     12345678987654321
 *     102.7
 *     2.71828182845905
 *     3.14159265358979
 *     2.22044604925031e-16
 *     1.7976931348623157e+308
 *     2.2250738585072e-308
 *     Total count: 7
 *
 */

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

    rb_secure(4);
    if (argc == 0) {
	of = 0;
    }
    else {
	rb_scan_args(argc, argv, "01", &of);
    }
    RETURN_ENUMERATOR(os, 1, &of);
    return os_obj_of(of);
}

/*
 *  call-seq:
 *     ObjectSpace.undefine_finalizer(obj)
 *
 *  Removes all finalizers for <i>obj</i>.
 *
 */

static VALUE
undefine_final(VALUE os, VALUE obj)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    if (OBJ_FROZEN(obj)) rb_error_frozen("object");
    if (finalizer_table) {
	st_delete(finalizer_table, (st_data_t*)&obj, 0);
    }
    FL_UNSET(obj, FL_FINALIZE);
    return obj;
}

/*
 *  call-seq:
 *     ObjectSpace.define_finalizer(obj, aProc=proc())
 *
 *  Adds <i>aProc</i> as a finalizer, to be called after <i>obj</i>
 *  was destroyed.
 *
 */

static VALUE
define_final(int argc, VALUE *argv, VALUE os)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    VALUE obj, block, table;

    rb_scan_args(argc, argv, "11", &obj, &block);
    if (OBJ_FROZEN(obj)) rb_error_frozen("object");
    if (argc == 1) {
	block = rb_block_proc();
    }
    else if (!rb_respond_to(block, rb_intern("call"))) {
	rb_raise(rb_eArgError, "wrong type argument %s (should be callable)",
		 rb_obj_classname(block));
    }
    if (!FL_ABLE(obj)) {
	rb_raise(rb_eArgError, "cannot define finalizer for %s",
		 rb_obj_classname(obj));
    }
    RBASIC(obj)->flags |= FL_FINALIZE;

    block = rb_ary_new3(2, INT2FIX(rb_safe_level()), block);
    OBJ_FREEZE(block);

    if (!finalizer_table) {
	finalizer_table = st_init_numtable();
    }
    if (st_lookup(finalizer_table, obj, &table)) {
	rb_ary_push(table, block);
    }
    else {
	table = rb_ary_new3(1, block);
	RBASIC(table)->klass = 0;
	st_add_direct(finalizer_table, obj, table);
    }
    return block;
}

static void
rb_gc_copy_finalizer_tmp(VALUE dest, VALUE obj)
{
    rb_objspace_t *objspace = gc_inner->get_objspace();
    VALUE table;

    if (!finalizer_table) return;
    if (!FL_TEST(obj, FL_FINALIZE)) return;
    if (st_lookup(finalizer_table, obj, &table)) {
	st_insert(finalizer_table, dest, table);
    }
    FL_SET(dest, FL_FINALIZE);
}

static VALUE
run_single_final(VALUE arg)
{
    VALUE *args = (VALUE *)arg;
    rb_eval_cmd(args[0], args[1], (int)args[2]);
    return Qnil;
}

static void
run_finalizer(rb_objspace_t *objspace, VALUE obj, VALUE objid, VALUE table)
{
    long i;
    int status;
    VALUE args[3];

    args[1] = 0;
    args[2] = (VALUE)rb_safe_level();
    if (!args[1] && RARRAY_LEN(table) > 0) {
	args[1] = rb_obj_freeze(rb_ary_new3(1, objid));
    }
    for (i=0; i<RARRAY_LEN(table); i++) {
	VALUE final = RARRAY_PTR(table)[i];
	args[0] = RARRAY_PTR(final)[1];
	args[2] = FIX2INT(RARRAY_PTR(final)[0]);
	rb_protect(run_single_final, (VALUE)args, &status);
    }
}

static void
run_final(rb_objspace_t *objspace, VALUE obj)
{
    VALUE table, objid;
    RUBY_DATA_FUNC free_func = 0;

    objid = rb_obj_id(obj);	/* make obj into id */
    RBASIC(obj)->klass = 0;

    if (RTYPEDDATA_P(obj)) {
	free_func = RTYPEDDATA_TYPE(obj)->dfree;
    }
    else {
	free_func = RDATA(obj)->dfree;
    }
    if (free_func) {
	(*free_func)(DATA_PTR(obj));
    }

    if (finalizer_table &&
	st_delete(finalizer_table, (st_data_t*)&obj, &table)) {
	run_finalizer(objspace, obj, objid, table);
    }
}

static void
finalize_deferred(rb_objspace_t *ob…