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gecko-dev/gc/boehm/dbg_mlc.c

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19 KiB
C
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/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
* Copyright (c) 1997 by Silicon Graphics. All rights reserved.
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*/
/* Boehm, October 9, 1995 1:16 pm PDT */
# include "gc_priv.h"
void GC_default_print_heap_obj_proc();
GC_API void GC_register_finalizer_no_order
GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd,
GC_finalization_proc *ofn, GC_PTR *ocd));
/* Do we want to and know how to save the call stack at the time of */
/* an allocation? How much space do we want to use in each object? */
# define START_FLAG ((word)0xfedcedcb)
# define END_FLAG ((word)0xbcdecdef)
/* Stored both one past the end of user object, and one before */
/* the end of the object as seen by the allocator. */
/* Object header */
typedef struct {
char * oh_string; /* object descriptor string */
word oh_int; /* object descriptor integers */
# ifdef NEED_CALLINFO
struct callinfo oh_ci[NFRAMES];
# endif
word oh_sz; /* Original malloc arg. */
word oh_sf; /* start flag */
} oh;
/* The size of the above structure is assumed not to dealign things, */
/* and to be a multiple of the word length. */
#define DEBUG_BYTES (sizeof (oh) + sizeof (word))
#undef ROUNDED_UP_WORDS
#define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1) - 1)
#ifdef SAVE_CALL_CHAIN
# define ADD_CALL_CHAIN(base, ra) GC_save_callers(((oh *)(base)) -> oh_ci)
# define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci)
#else
# ifdef GC_ADD_CALLER
# define ADD_CALL_CHAIN(base, ra) ((oh *)(base)) -> oh_ci[0].ci_pc = (ra)
# define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci)
# else
# define ADD_CALL_CHAIN(base, ra)
# define PRINT_CALL_CHAIN(base)
# endif
#endif
/* Check whether object with base pointer p has debugging info */
/* p is assumed to point to a legitimate object in our part */
/* of the heap. */
GC_bool GC_has_debug_info(p)
ptr_t p;
{
register oh * ohdr = (oh *)p;
register ptr_t body = (ptr_t)(ohdr + 1);
register word sz = GC_size((ptr_t) ohdr);
if (HBLKPTR((ptr_t)ohdr) != HBLKPTR((ptr_t)body)
|| sz < sizeof (oh)) {
return(FALSE);
}
if (ohdr -> oh_sz == sz) {
/* Object may have had debug info, but has been deallocated */
return(FALSE);
}
if (ohdr -> oh_sf == (START_FLAG ^ (word)body)) return(TRUE);
if (((word *)ohdr)[BYTES_TO_WORDS(sz)-1] == (END_FLAG ^ (word)body)) {
return(TRUE);
}
return(FALSE);
}
/* Store debugging info into p. Return displaced pointer. */
/* Assumes we don't hold allocation lock. */
ptr_t GC_store_debug_info(p, sz, string, integer)
register ptr_t p; /* base pointer */
word sz; /* bytes */
char * string;
word integer;
{
register oh * ohdr = (oh *)p;
register word * result = (word *)(ohdr + 1);
DCL_LOCK_STATE;
/* There is some argument that we should dissble signals here. */
/* But that's expensive. And this way things should only appear */
/* inconsistent while we're in the handler. */
LOCK();
ohdr -> oh_string = string;
ohdr -> oh_int = integer;
ohdr -> oh_sz = sz;
ohdr -> oh_sf = START_FLAG ^ (word)result;
((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =
result[ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;
UNLOCK();
return((ptr_t)result);
}
/* Check the object with debugging info at p */
/* return NIL if it's OK. Else return clobbered */
/* address. */
ptr_t GC_check_annotated_obj(ohdr)
register oh * ohdr;
{
register ptr_t body = (ptr_t)(ohdr + 1);
register word gc_sz = GC_size((ptr_t)ohdr);
if (ohdr -> oh_sz + DEBUG_BYTES > gc_sz) {
return((ptr_t)(&(ohdr -> oh_sz)));
}
if (ohdr -> oh_sf != (START_FLAG ^ (word)body)) {
return((ptr_t)(&(ohdr -> oh_sf)));
}
if (((word *)ohdr)[BYTES_TO_WORDS(gc_sz)-1] != (END_FLAG ^ (word)body)) {
return((ptr_t)((word *)ohdr + BYTES_TO_WORDS(gc_sz)-1));
}
if (((word *)body)[ROUNDED_UP_WORDS(ohdr -> oh_sz)]
!= (END_FLAG ^ (word)body)) {
return((ptr_t)((word *)body + ROUNDED_UP_WORDS(ohdr -> oh_sz)));
}
return(0);
}
extern const char* getTypeName(void* ptr);
void GC_print_obj(p)
ptr_t p;
{
register oh * ohdr = (oh *)GC_base(p);
register word *wp, *wend;
wp = (word*)((unsigned long)ohdr + sizeof(oh));
#ifdef MACOS
GC_err_printf3("0x%08lX <%s> (sz=%ld)\n", wp, getTypeName(wp),
(unsigned long)(ohdr -> oh_sz));
#else
GC_err_printf1("0x%08lX (", wp);
GC_err_puts(ohdr->oh_string);
GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
(unsigned long)(ohdr -> oh_sz));
#endif
/* print all potential references held by this object. */
wend = (word*)((unsigned long)wp + ohdr -> oh_sz);
while (wp < wend) GC_err_printf1("\t0x%08lX\n", *wp++);
PRINT_CALL_CHAIN(ohdr);
}
void GC_debug_print_heap_obj_proc(p)
ptr_t p;
{
if (GC_has_debug_info(p)) {
GC_print_obj(p);
} else {
GC_default_print_heap_obj_proc(p);
}
}
void GC_print_smashed_obj(p, clobbered_addr)
ptr_t p, clobbered_addr;
{
register oh * ohdr = (oh *)GC_base(p);
GC_err_printf2("0x%lx in object at 0x%lx(", (unsigned long)clobbered_addr,
(unsigned long)p);
if (clobbered_addr <= (ptr_t)(&(ohdr -> oh_sz))
|| ohdr -> oh_string == 0) {
GC_err_printf1("<smashed>, appr. sz = %ld)\n",
(GC_size((ptr_t)ohdr) - DEBUG_BYTES));
} else {
if (ohdr -> oh_string[0] == '\0') {
GC_err_puts("EMPTY(smashed?)");
} else {
GC_err_puts(ohdr -> oh_string);
}
GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
(unsigned long)(ohdr -> oh_sz));
PRINT_CALL_CHAIN(ohdr);
}
}
void GC_check_heap_proc();
void GC_start_debugging()
{
GC_check_heap = GC_check_heap_proc;
GC_print_heap_obj = GC_debug_print_heap_obj_proc;
GC_debugging_started = TRUE;
GC_register_displacement((word)sizeof(oh));
}
# if defined(__STDC__) || defined(__cplusplus)
void GC_debug_register_displacement(GC_word offset)
# else
void GC_debug_register_displacement(offset)
GC_word offset;
# endif
{
GC_register_displacement(offset);
GC_register_displacement((word)sizeof(oh) + offset);
}
# ifdef GC_ADD_CALLER
# define EXTRA_ARGS word ra, char * s, int i
# define OPT_RA ra,
# else
# define EXTRA_ARGS char * s, int i
# define OPT_RA
# endif
# ifdef __STDC__
GC_PTR GC_debug_malloc(size_t lb, EXTRA_ARGS)
# else
GC_PTR GC_debug_malloc(lb, s, i)
size_t lb;
char * s;
int i;
# ifdef GC_ADD_CALLER
--> GC_ADD_CALLER not implemented for K&R C
# endif
# endif
{
GC_PTR result = GC_malloc(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf1("GC_debug_malloc(%ld) returning NIL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf1(":%ld)\n", (unsigned long)i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, (word)i));
}
#ifdef STUBBORN_ALLOC
# ifdef __STDC__
GC_PTR GC_debug_malloc_stubborn(size_t lb, EXTRA_ARGS)
# else
GC_PTR GC_debug_malloc_stubborn(lb, s, i)
size_t lb;
char * s;
int i;
# endif
{
GC_PTR result = GC_malloc_stubborn(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf1("GC_debug_malloc(%ld) returning NIL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf1(":%ld)\n", (unsigned long)i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, (word)i));
}
void GC_debug_change_stubborn(p)
GC_PTR p;
{
register GC_PTR q = GC_base(p);
register hdr * hhdr;
if (q == 0) {
GC_err_printf1("Bad argument: 0x%lx to GC_debug_change_stubborn\n",
(unsigned long) p);
ABORT("GC_debug_change_stubborn: bad arg");
}
hhdr = HDR(q);
if (hhdr -> hb_obj_kind != STUBBORN) {
GC_err_printf1("GC_debug_change_stubborn arg not stubborn: 0x%lx\n",
(unsigned long) p);
ABORT("GC_debug_change_stubborn: arg not stubborn");
}
GC_change_stubborn(q);
}
void GC_debug_end_stubborn_change(p)
GC_PTR p;
{
register GC_PTR q = GC_base(p);
register hdr * hhdr;
if (q == 0) {
GC_err_printf1("Bad argument: 0x%lx to GC_debug_end_stubborn_change\n",
(unsigned long) p);
ABORT("GC_debug_end_stubborn_change: bad arg");
}
hhdr = HDR(q);
if (hhdr -> hb_obj_kind != STUBBORN) {
GC_err_printf1("debug_end_stubborn_change arg not stubborn: 0x%lx\n",
(unsigned long) p);
ABORT("GC_debug_end_stubborn_change: arg not stubborn");
}
GC_end_stubborn_change(q);
}
#endif /* STUBBORN_ALLOC */
# ifdef __STDC__
GC_PTR GC_debug_malloc_atomic(size_t lb, EXTRA_ARGS)
# else
GC_PTR GC_debug_malloc_atomic(lb, s, i)
size_t lb;
char * s;
int i;
# endif
{
GC_PTR result = GC_malloc_atomic(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf1("GC_debug_malloc_atomic(%ld) returning NIL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf1(":%ld)\n", (unsigned long)i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, (word)i));
}
# ifdef __STDC__
GC_PTR GC_debug_malloc_uncollectable(size_t lb, EXTRA_ARGS)
# else
GC_PTR GC_debug_malloc_uncollectable(lb, s, i)
size_t lb;
char * s;
int i;
# endif
{
GC_PTR result = GC_malloc_uncollectable(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf1("GC_debug_malloc_uncollectable(%ld) returning NIL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf1(":%ld)\n", (unsigned long)i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, (word)i));
}
#ifdef ATOMIC_UNCOLLECTABLE
# ifdef __STDC__
GC_PTR GC_debug_malloc_atomic_uncollectable(size_t lb, EXTRA_ARGS)
# else
GC_PTR GC_debug_malloc_atomic_uncollectable(lb, s, i)
size_t lb;
char * s;
int i;
# endif
{
GC_PTR result = GC_malloc_atomic_uncollectable(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf1(
"GC_debug_malloc_atomic_uncollectable(%ld) returning NIL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf1(":%ld)\n", (unsigned long)i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, (word)i));
}
#endif /* ATOMIC_UNCOLLECTABLE */
# ifdef __STDC__
void GC_debug_free(GC_PTR p)
# else
void GC_debug_free(p)
GC_PTR p;
# endif
{
register GC_PTR base = GC_base(p);
register ptr_t clobbered;
if (base == 0) {
GC_err_printf1("Attempt to free invalid pointer %lx\n",
(unsigned long)p);
if (p != 0) ABORT("free(invalid pointer)");
}
if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
GC_err_printf1(
"GC_debug_free called on pointer %lx wo debugging info\n",
(unsigned long)p);
} else {
oh * ohdr = (oh *)base;
clobbered = GC_check_annotated_obj(ohdr);
if (clobbered != 0) {
if (ohdr -> oh_sz == GC_size(base)) {
GC_err_printf0(
"GC_debug_free: found previously deallocated (?) object at ");
} else {
GC_err_printf0("GC_debug_free: found smashed object at ");
}
GC_print_smashed_obj(p, clobbered);
}
/* Invalidate size */
ohdr -> oh_sz = GC_size(base);
}
# ifdef FIND_LEAK
GC_free(base);
# else
{
register hdr * hhdr = HDR(p);
GC_bool uncollectable = FALSE;
if (hhdr -> hb_obj_kind == UNCOLLECTABLE) {
uncollectable = TRUE;
}
# ifdef ATOMIC_UNCOLLECTABLE
if (hhdr -> hb_obj_kind == AUNCOLLECTABLE) {
uncollectable = TRUE;
}
# endif
if (uncollectable) GC_free(base);
}
# endif
}
# ifdef __STDC__
GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, EXTRA_ARGS)
# else
GC_PTR GC_debug_realloc(p, lb, s, i)
GC_PTR p;
size_t lb;
char *s;
int i;
# endif
{
register GC_PTR base = GC_base(p);
register ptr_t clobbered;
register GC_PTR result;
register size_t copy_sz = lb;
register size_t old_sz;
register hdr * hhdr;
if (p == 0) return(GC_debug_malloc(lb, OPT_RA s, i));
if (base == 0) {
GC_err_printf1(
"Attempt to reallocate invalid pointer %lx\n", (unsigned long)p);
ABORT("realloc(invalid pointer)");
}
if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
GC_err_printf1(
"GC_debug_realloc called on pointer %lx wo debugging info\n",
(unsigned long)p);
return(GC_realloc(p, lb));
}
hhdr = HDR(base);
switch (hhdr -> hb_obj_kind) {
# ifdef STUBBORN_ALLOC
case STUBBORN:
result = GC_debug_malloc_stubborn(lb, OPT_RA s, i);
break;
# endif
case NORMAL:
result = GC_debug_malloc(lb, OPT_RA s, i);
break;
case PTRFREE:
result = GC_debug_malloc_atomic(lb, OPT_RA s, i);
break;
case UNCOLLECTABLE:
result = GC_debug_malloc_uncollectable(lb, OPT_RA s, i);
break;
# ifdef ATOMIC_UNCOLLECTABLE
case AUNCOLLECTABLE:
result = GC_debug_malloc_atomic_uncollectable(lb, OPT_RA s, i);
break;
# endif
default:
GC_err_printf0("GC_debug_realloc: encountered bad kind\n");
ABORT("bad kind");
}
clobbered = GC_check_annotated_obj((oh *)base);
if (clobbered != 0) {
GC_err_printf0("GC_debug_realloc: found smashed object at ");
GC_print_smashed_obj(p, clobbered);
}
old_sz = ((oh *)base) -> oh_sz;
if (old_sz < copy_sz) copy_sz = old_sz;
if (result == 0) return(0);
BCOPY(p, result, copy_sz);
GC_debug_free(p);
return(result);
}
/* Check all marked objects in the given block for validity */
/*ARGSUSED*/
void GC_check_heap_block(hbp, dummy)
register struct hblk *hbp; /* ptr to current heap block */
word dummy;
{
register struct hblkhdr * hhdr = HDR(hbp);
register word sz = hhdr -> hb_sz;
register int word_no;
register word *p, *plim;
p = (word *)(hbp->hb_body);
word_no = HDR_WORDS;
if (sz > MAXOBJSZ) {
plim = p;
} else {
plim = (word *)((((word)hbp) + HBLKSIZE) - WORDS_TO_BYTES(sz));
}
/* go through all words in block */
while( p <= plim ) {
if( mark_bit_from_hdr(hhdr, word_no)
&& GC_has_debug_info((ptr_t)p)) {
ptr_t clobbered = GC_check_annotated_obj((oh *)p);
if (clobbered != 0) {
GC_err_printf0(
"GC_check_heap_block: found smashed object at ");
GC_print_smashed_obj((ptr_t)p, clobbered);
}
}
word_no += sz;
p += sz;
}
}
/* This assumes that all accessible objects are marked, and that */
/* I hold the allocation lock. Normally called by collector. */
void GC_check_heap_proc()
{
# ifndef SMALL_CONFIG
if (sizeof(oh) & (2 * sizeof(word) - 1) != 0) {
ABORT("Alignment problem: object header has inappropriate size\n");
}
# endif
GC_apply_to_all_blocks(GC_check_heap_block, (word)0);
}
struct closure {
GC_finalization_proc cl_fn;
GC_PTR cl_data;
};
# ifdef __STDC__
void * GC_make_closure(GC_finalization_proc fn, void * data)
# else
GC_PTR GC_make_closure(fn, data)
GC_finalization_proc fn;
GC_PTR data;
# endif
{
struct closure * result =
(struct closure *) GC_malloc(sizeof (struct closure));
result -> cl_fn = fn;
result -> cl_data = data;
return((GC_PTR)result);
}
# ifdef __STDC__
void GC_debug_invoke_finalizer(void * obj, void * data)
# else
void GC_debug_invoke_finalizer(obj, data)
char * obj;
char * data;
# endif
{
register struct closure * cl = (struct closure *) data;
(*(cl -> cl_fn))((GC_PTR)((char *)obj + sizeof(oh)), cl -> cl_data);
}
# ifdef __STDC__
void GC_debug_register_finalizer(GC_PTR obj, GC_finalization_proc fn,
GC_PTR cd, GC_finalization_proc *ofn,
GC_PTR *ocd)
# else
void GC_debug_register_finalizer(obj, fn, cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc fn;
GC_PTR cd;
GC_finalization_proc *ofn;
GC_PTR *ocd;
# endif
{
ptr_t base = GC_base(obj);
if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
GC_err_printf1(
"GC_register_finalizer called with non-base-pointer 0x%lx\n",
obj);
}
GC_register_finalizer(base, GC_debug_invoke_finalizer,
GC_make_closure(fn,cd), ofn, ocd);
}
# ifdef __STDC__
void GC_debug_register_finalizer_no_order
(GC_PTR obj, GC_finalization_proc fn,
GC_PTR cd, GC_finalization_proc *ofn,
GC_PTR *ocd)
# else
void GC_debug_register_finalizer_no_order
(obj, fn, cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc fn;
GC_PTR cd;
GC_finalization_proc *ofn;
GC_PTR *ocd;
# endif
{
ptr_t base = GC_base(obj);
if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
GC_err_printf1(
"GC_register_finalizer_no_order called with non-base-pointer 0x%lx\n",
obj);
}
GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
GC_make_closure(fn,cd), ofn, ocd);
}
# ifdef __STDC__
void GC_debug_register_finalizer_ignore_self
(GC_PTR obj, GC_finalization_proc fn,
GC_PTR cd, GC_finalization_proc *ofn,
GC_PTR *ocd)
# else
void GC_debug_register_finalizer_ignore_self
(obj, fn, cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc fn;
GC_PTR cd;
GC_finalization_proc *ofn;
GC_PTR *ocd;
# endif
{
ptr_t base = GC_base(obj);
if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
GC_err_printf1(
"GC_register_finalizer_ignore_self called with non-base-pointer 0x%lx\n",
obj);
}
GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
GC_make_closure(fn,cd), ofn, ocd);
}
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