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gcc/boehm-gc/dbg_mlc.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.
* Copyright (c) 1999-2000 by Hewlett-Packard Company. 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.
*/
#include "private/dbg_mlc.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));
#ifndef SHORT_DBG_HDRS
/* 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. */
/* This excludes the check as to whether the back pointer is */
/* odd, which is added by the GC_HAS_DEBUG_INFO macro. */
/* Note that if DBG_HDRS_ALL is set, uncollectable objects */
/* on free lists may not have debug information set. Thus it's */
/* not always safe to return TRUE, even if the client does */
/* its part. */
GC_bool GC_has_other_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 < DEBUG_BYTES + EXTRA_BYTES) {
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);
}
#endif
#ifdef KEEP_BACK_PTRS
# include <stdlib.h>
# if defined(LINUX) || defined(SUNOS4) || defined(SUNOS5) \
|| defined(HPUX) || defined(IRIX5) || defined(OSF1)
# define RANDOM() random()
# else
# define RANDOM() (long)rand()
# endif
/* Store back pointer to source in dest, if that appears to be possible. */
/* This is not completely safe, since we may mistakenly conclude that */
/* dest has a debugging wrapper. But the error probability is very */
/* small, and this shouldn't be used in production code. */
/* We assume that dest is the real base pointer. Source will usually */
/* be a pointer to the interior of an object. */
void GC_store_back_pointer(ptr_t source, ptr_t dest)
{
if (GC_HAS_DEBUG_INFO(dest)) {
((oh *)dest) -> oh_back_ptr = HIDE_BACK_PTR(source);
}
}
void GC_marked_for_finalization(ptr_t dest) {
GC_store_back_pointer(MARKED_FOR_FINALIZATION, dest);
}
/* Store information about the object referencing dest in *base_p */
/* and *offset_p. */
/* source is root ==> *base_p = address, *offset_p = 0 */
/* source is heap object ==> *base_p != 0, *offset_p = offset */
/* Returns 1 on success, 0 if source couldn't be determined. */
/* Dest can be any address within a heap object. */
GC_ref_kind GC_get_back_ptr_info(void *dest, void **base_p, size_t *offset_p)
{
oh * hdr = (oh *)GC_base(dest);
ptr_t bp;
ptr_t bp_base;
if (!GC_HAS_DEBUG_INFO((ptr_t) hdr)) return GC_NO_SPACE;
bp = REVEAL_POINTER(hdr -> oh_back_ptr);
if (MARKED_FOR_FINALIZATION == bp) return GC_FINALIZER_REFD;
if (MARKED_FROM_REGISTER == bp) return GC_REFD_FROM_REG;
if (NOT_MARKED == bp) return GC_UNREFERENCED;
# if ALIGNMENT == 1
/* Heuristically try to fix off by 1 errors we introduced by */
/* insisting on even addresses. */
{
ptr_t alternate_ptr = bp + 1;
ptr_t target = *(ptr_t *)bp;
ptr_t alternate_target = *(ptr_t *)alternate_ptr;
if (alternate_target >= GC_least_plausible_heap_addr
&& alternate_target <= GC_greatest_plausible_heap_addr
&& (target < GC_least_plausible_heap_addr
|| target > GC_greatest_plausible_heap_addr)) {
bp = alternate_ptr;
}
}
# endif
bp_base = GC_base(bp);
if (0 == bp_base) {
*base_p = bp;
*offset_p = 0;
return GC_REFD_FROM_ROOT;
} else {
if (GC_HAS_DEBUG_INFO(bp_base)) bp_base += sizeof(oh);
*base_p = bp_base;
*offset_p = bp - bp_base;
return GC_REFD_FROM_HEAP;
}
}
/* Generate a random heap address. */
/* The resulting address is in the heap, but */
/* not necessarily inside a valid object. */
void *GC_generate_random_heap_address(void)
{
int i;
long heap_offset = RANDOM();
if (GC_heapsize > RAND_MAX) {
heap_offset *= RAND_MAX;
heap_offset += RANDOM();
}
heap_offset %= GC_heapsize;
/* This doesn't yield a uniform distribution, especially if */
/* e.g. RAND_MAX = 1.5* GC_heapsize. But for typical cases, */
/* it's not too bad. */
for (i = 0; i < GC_n_heap_sects; ++ i) {
int size = GC_heap_sects[i].hs_bytes;
if (heap_offset < size) {
return GC_heap_sects[i].hs_start + heap_offset;
} else {
heap_offset -= size;
}
}
ABORT("GC_generate_random_heap_address: size inconsistency");
/*NOTREACHED*/
return 0;
}
/* Generate a random address inside a valid marked heap object. */
void *GC_generate_random_valid_address(void)
{
ptr_t result;
ptr_t base;
for (;;) {
result = GC_generate_random_heap_address();
base = GC_base(result);
if (0 == base) continue;
if (!GC_is_marked(base)) continue;
return result;
}
}
/* Print back trace for p */
void GC_print_backtrace(void *p)
{
void *current = p;
int i;
GC_ref_kind source;
size_t offset;
void *base;
GC_print_heap_obj(GC_base(current));
GC_err_printf0("\n");
for (i = 0; ; ++i) {
source = GC_get_back_ptr_info(current, &base, &offset);
if (GC_UNREFERENCED == source) {
GC_err_printf0("Reference could not be found\n");
goto out;
}
if (GC_NO_SPACE == source) {
GC_err_printf0("No debug info in object: Can't find reference\n");
goto out;
}
GC_err_printf1("Reachable via %d levels of pointers from ",
(unsigned long)i);
switch(source) {
case GC_REFD_FROM_ROOT:
GC_err_printf1("root at 0x%lx\n", (unsigned long)base);
goto out;
case GC_REFD_FROM_REG:
GC_err_printf0("root in register\n");
goto out;
case GC_FINALIZER_REFD:
GC_err_printf0("list of finalizable objects\n");
goto out;
case GC_REFD_FROM_HEAP:
GC_err_printf1("offset %ld in object:\n", (unsigned long)offset);
/* Take GC_base(base) to get real base, i.e. header. */
GC_print_heap_obj(GC_base(base));
GC_err_printf0("\n");
break;
}
current = base;
}
out:;
}
/* Force a garbage collection and generate a backtrace from a */
/* random heap address. */
void GC_generate_random_backtrace(void)
{
void * current;
GC_gcollect();
current = GC_generate_random_valid_address();
GC_printf1("Chose address 0x%lx in object\n", (unsigned long)current);
GC_print_backtrace(current);
}
#endif /* KEEP_BACK_PTRS */
# define CROSSES_HBLK(p, sz) \
(((word)(p + sizeof(oh) + sz - 1) ^ (word)p) >= HBLKSIZE)
/* 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 */
GC_CONST char * string;
word integer;
{
register word * result = (word *)((oh *)p + 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();
GC_ASSERT(GC_size(p) >= sizeof(oh) + sz);
GC_ASSERT(!(SMALL_OBJ(sz) && CROSSES_HBLK(p, sz)));
# ifdef KEEP_BACK_PTRS
((oh *)p) -> oh_back_ptr = HIDE_BACK_PTR(NOT_MARKED);
# endif
# ifdef MAKE_BACK_GRAPH
((oh *)p) -> oh_bg_ptr = HIDE_BACK_PTR((ptr_t)0);
# endif
((oh *)p) -> oh_string = string;
((oh *)p) -> oh_int = integer;
# ifndef SHORT_DBG_HDRS
((oh *)p) -> oh_sz = sz;
((oh *)p) -> oh_sf = START_FLAG ^ (word)result;
((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =
result[SIMPLE_ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;
# endif
UNLOCK();
return((ptr_t)result);
}
#ifdef DBG_HDRS_ALL
/* Store debugging info into p. Return displaced pointer. */
/* This version assumes we do hold the allocation lock. */
ptr_t GC_store_debug_info_inner(p, sz, string, integer)
register ptr_t p; /* base pointer */
word sz; /* bytes */
char * string;
word integer;
{
register word * result = (word *)((oh *)p + 1);
/* There is some argument that we should disable signals here. */
/* But that's expensive. And this way things should only appear */
/* inconsistent while we're in the handler. */
GC_ASSERT(GC_size(p) >= sizeof(oh) + sz);
GC_ASSERT(!(SMALL_OBJ(sz) && CROSSES_HBLK(p, sz)));
# ifdef KEEP_BACK_PTRS
((oh *)p) -> oh_back_ptr = HIDE_BACK_PTR(NOT_MARKED);
# endif
# ifdef MAKE_BACK_GRAPH
((oh *)p) -> oh_bg_ptr = HIDE_BACK_PTR((ptr_t)0);
# endif
((oh *)p) -> oh_string = string;
((oh *)p) -> oh_int = integer;
# ifndef SHORT_DBG_HDRS
((oh *)p) -> oh_sz = sz;
((oh *)p) -> oh_sf = START_FLAG ^ (word)result;
((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =
result[SIMPLE_ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;
# endif
return((ptr_t)result);
}
#endif
#ifndef SHORT_DBG_HDRS
/* Check the object with debugging info at ohdr */
/* 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)[SIMPLE_ROUNDED_UP_WORDS(ohdr -> oh_sz)]
!= (END_FLAG ^ (word)body)) {
return((ptr_t)((word *)body + SIMPLE_ROUNDED_UP_WORDS(ohdr -> oh_sz)));
}
return(0);
}
#endif /* !SHORT_DBG_HDRS */
void GC_print_obj(p)
ptr_t p;
{
register oh * ohdr = (oh *)GC_base(p);
GC_ASSERT(!I_HOLD_LOCK());
GC_err_printf1("0x%lx (", ((unsigned long)ohdr + sizeof(oh)));
GC_err_puts(ohdr -> oh_string);
# ifdef SHORT_DBG_HDRS
GC_err_printf1(":%ld)\n", (unsigned long)(ohdr -> oh_int));
# else
GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
(unsigned long)(ohdr -> oh_sz));
# endif
PRINT_CALL_CHAIN(ohdr);
}
# if defined(__STDC__) || defined(__cplusplus)
void GC_debug_print_heap_obj_proc(ptr_t p)
# else
void GC_debug_print_heap_obj_proc(p)
ptr_t p;
# endif
{
GC_ASSERT(!I_HOLD_LOCK());
if (GC_HAS_DEBUG_INFO(p)) {
GC_print_obj(p);
} else {
GC_default_print_heap_obj_proc(p);
}
}
#ifndef SHORT_DBG_HDRS
void GC_print_smashed_obj(p, clobbered_addr)
ptr_t p, clobbered_addr;
{
register oh * ohdr = (oh *)GC_base(p);
GC_ASSERT(!I_HOLD_LOCK());
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);
}
}
#endif
void GC_check_heap_proc GC_PROTO((void));
void GC_print_all_smashed_proc GC_PROTO((void));
void GC_do_nothing() {}
void GC_start_debugging()
{
# ifndef SHORT_DBG_HDRS
GC_check_heap = GC_check_heap_proc;
GC_print_all_smashed = GC_print_all_smashed_proc;
# else
GC_check_heap = GC_do_nothing;
GC_print_all_smashed = GC_do_nothing;
# endif
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 __STDC__
GC_PTR GC_debug_malloc(size_t lb, GC_EXTRA_PARAMS)
# 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 __STDC__
GC_PTR GC_debug_malloc_ignore_off_page(size_t lb, GC_EXTRA_PARAMS)
# else
GC_PTR GC_debug_malloc_ignore_off_page(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_ignore_off_page(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf1("GC_debug_malloc_ignore_off_page(%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_atomic_ignore_off_page(size_t lb, GC_EXTRA_PARAMS)
# else
GC_PTR GC_debug_malloc_atomic_ignore_off_page(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_atomic_ignore_off_page(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf1("GC_debug_malloc_atomic_ignore_off_page(%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 DBG_HDRS_ALL
/*
* An allocation function for internal use.
* Normally internally allocated objects do not have debug information.
* But in this case, we need to make sure that all objects have debug
* headers.
* We assume debugging was started in collector initialization,
* and we already hold the GC lock.
*/
GC_PTR GC_debug_generic_malloc_inner(size_t lb, int k)
{
GC_PTR result = GC_generic_malloc_inner(lb + DEBUG_BYTES, k);
if (result == 0) {
GC_err_printf1("GC internal allocation (%ld bytes) returning NIL\n",
(unsigned long) lb);
return(0);
}
ADD_CALL_CHAIN(result, GC_RETURN_ADDR);
return (GC_store_debug_info_inner(result, (word)lb, "INTERNAL", (word)0));
}
GC_PTR GC_debug_generic_malloc_inner_ignore_off_page(size_t lb, int k)
{
GC_PTR result = GC_generic_malloc_inner_ignore_off_page(
lb + DEBUG_BYTES, k);
if (result == 0) {
GC_err_printf1("GC internal allocation (%ld bytes) returning NIL\n",
(unsigned long) lb);
return(0);
}
ADD_CALL_CHAIN(result, GC_RETURN_ADDR);
return (GC_store_debug_info_inner(result, (word)lb, "INTERNAL", (word)0));
}
# endif
#ifdef STUBBORN_ALLOC
# ifdef __STDC__
GC_PTR GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
# 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);
}
#else /* !STUBBORN_ALLOC */
# ifdef __STDC__
GC_PTR GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
# else
GC_PTR GC_debug_malloc_stubborn(lb, s, i)
size_t lb;
char * s;
int i;
# endif
{
return GC_debug_malloc(lb, OPT_RA s, i);
}
void GC_debug_change_stubborn(p)
GC_PTR p;
{
}
void GC_debug_end_stubborn_change(p)
GC_PTR p;
{
}
#endif /* !STUBBORN_ALLOC */
# ifdef __STDC__
GC_PTR GC_debug_malloc_atomic(size_t lb, GC_EXTRA_PARAMS)
# 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, GC_EXTRA_PARAMS)
# 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 + UNCOLLECTABLE_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, GC_EXTRA_PARAMS)
# 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 + UNCOLLECTABLE_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;
register ptr_t clobbered;
if (0 == p) return;
base = GC_base(p);
if (base == 0) {
GC_err_printf1("Attempt to free invalid pointer %lx\n",
(unsigned long)p);
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 {
# ifndef SHORT_DBG_HDRS
clobbered = GC_check_annotated_obj((oh *)base);
if (clobbered != 0) {
if (((oh *)base) -> 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 location at ");
}
GC_print_smashed_obj(p, clobbered);
}
/* Invalidate size */
((oh *)base) -> oh_sz = GC_size(base);
# endif /* SHORT_DBG_HDRS */
}
if (GC_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);
} /* !GC_find_leak */
}
#ifdef THREADS
extern void GC_free_inner(GC_PTR p);
/* Used internally; we assume it's called correctly. */
void GC_debug_free_inner(GC_PTR p)
{
GC_free_inner(GC_base(p));
}
#endif
# ifdef __STDC__
GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, GC_EXTRA_PARAMS)
# 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");
}
# ifdef SHORT_DBG_HDRS
old_sz = GC_size(base) - sizeof(oh);
# else
clobbered = GC_check_annotated_obj((oh *)base);
if (clobbered != 0) {
GC_err_printf0("GC_debug_realloc: found smashed location at ");
GC_print_smashed_obj(p, clobbered);
}
old_sz = ((oh *)base) -> oh_sz;
# endif
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);
}
#ifndef SHORT_DBG_HDRS
/* List of smashed objects. We defer printing these, since we can't */
/* always print them nicely with the allocation lock held. */
/* We put them here instead of in GC_arrays, since it may be useful to */
/* be able to look at them with the debugger. */
#define MAX_SMASHED 20
ptr_t GC_smashed[MAX_SMASHED];
unsigned GC_n_smashed = 0;
# if defined(__STDC__) || defined(__cplusplus)
void GC_add_smashed(ptr_t smashed)
# else
void GC_add_smashed(smashed)
ptr_t smashed;
#endif
{
GC_ASSERT(GC_is_marked(GC_base(smashed)));
GC_smashed[GC_n_smashed] = smashed;
if (GC_n_smashed < MAX_SMASHED - 1) ++GC_n_smashed;
/* In case of overflow, we keep the first MAX_SMASHED-1 */
/* entries plus the last one. */
GC_have_errors = TRUE;
}
/* Print all objects on the list. Clear the list. */
void GC_print_all_smashed_proc ()
{
unsigned i;
GC_ASSERT(!I_HOLD_LOCK());
if (GC_n_smashed == 0) return;
GC_err_printf0("GC_check_heap_block: found smashed heap objects:\n");
for (i = 0; i < GC_n_smashed; ++i) {
GC_print_smashed_obj(GC_base(GC_smashed[i]), GC_smashed[i]);
GC_smashed[i] = 0;
}
GC_n_smashed = 0;
}
/* Check all marked objects in the given block for validity */
/*ARGSUSED*/
# if defined(__STDC__) || defined(__cplusplus)
void GC_check_heap_block(register struct hblk *hbp, word dummy)
# else
void GC_check_heap_block(hbp, dummy)
register struct hblk *hbp; /* ptr to current heap block */
word dummy;
# endif
{
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 = 0;
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_add_smashed(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
# ifdef ALIGN_DOUBLE
GC_STATIC_ASSERT((sizeof(oh) & (2 * sizeof(word) - 1)) == 0);
# else
GC_STATIC_ASSERT((sizeof(oh) & (sizeof(word) - 1)) == 0);
# endif
# endif
GC_apply_to_all_blocks(GC_check_heap_block, (word)0);
}
#endif /* !SHORT_DBG_HDRS */
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 =
# ifdef DBG_HDRS_ALL
(struct closure *) GC_debug_malloc(sizeof (struct closure),
GC_EXTRAS);
# else
(struct closure *) GC_malloc(sizeof (struct closure));
# endif
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);
}
/* Set ofn and ocd to reflect the values we got back. */
static void store_old (obj, my_old_fn, my_old_cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc my_old_fn;
struct closure * my_old_cd;
GC_finalization_proc *ofn;
GC_PTR *ocd;
{
if (0 != my_old_fn) {
if (my_old_fn != GC_debug_invoke_finalizer) {
GC_err_printf1("Debuggable object at 0x%lx had non-debug finalizer.\n",
obj);
/* This should probably be fatal. */
} else {
if (ofn) *ofn = my_old_cd -> cl_fn;
if (ocd) *ocd = my_old_cd -> cl_data;
}
} else {
if (ofn) *ofn = 0;
if (ocd) *ocd = 0;
}
}
# 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
{
GC_finalization_proc my_old_fn;
GC_PTR my_old_cd;
ptr_t base = GC_base(obj);
if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
GC_err_printf1(
"GC_debug_register_finalizer called with non-base-pointer 0x%lx\n",
obj);
}
if (0 == fn) {
GC_register_finalizer(base, 0, 0, &my_old_fn, &my_old_cd);
} else {
GC_register_finalizer(base, GC_debug_invoke_finalizer,
GC_make_closure(fn,cd), &my_old_fn, &my_old_cd);
}
store_old(obj, my_old_fn, (struct closure *)my_old_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
{
GC_finalization_proc my_old_fn;
GC_PTR my_old_cd;
ptr_t base = GC_base(obj);
if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
GC_err_printf1(
"GC_debug_register_finalizer_no_order called with non-base-pointer 0x%lx\n",
obj);
}
if (0 == fn) {
GC_register_finalizer_no_order(base, 0, 0, &my_old_fn, &my_old_cd);
} else {
GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
GC_make_closure(fn,cd), &my_old_fn,
&my_old_cd);
}
store_old(obj, my_old_fn, (struct closure *)my_old_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
{
GC_finalization_proc my_old_fn;
GC_PTR my_old_cd;
ptr_t base = GC_base(obj);
if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
GC_err_printf1(
"GC_debug_register_finalizer_ignore_self called with non-base-pointer 0x%lx\n",
obj);
}
if (0 == fn) {
GC_register_finalizer_ignore_self(base, 0, 0, &my_old_fn, &my_old_cd);
} else {
GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
GC_make_closure(fn,cd), &my_old_fn,
&my_old_cd);
}
store_old(obj, my_old_fn, (struct closure *)my_old_cd, ofn, ocd);
}
#ifdef GC_ADD_CALLER
# define RA GC_RETURN_ADDR,
#else
# define RA
#endif
GC_PTR GC_debug_malloc_replacement(lb)
size_t lb;
{
return GC_debug_malloc(lb, RA "unknown", 0);
}
GC_PTR GC_debug_realloc_replacement(p, lb)
GC_PTR p;
size_t lb;
{
return GC_debug_realloc(p, lb, RA "unknown", 0);
}
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