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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) 1999-2004 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2007 Free Software Foundation, Inc
*
* 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"
#ifndef MSWINCE
# include <errno.h>
#endif
#include <string.h>
#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 (1), even if the client does */
/* its part. Return -1 if the object with debug info has been */
/* marked as deallocated. */
GC_INNER int GC_has_other_debug_info(ptr_t p)
{
ptr_t body = (ptr_t)((oh *)p + 1);
word sz = GC_size(p);
if (HBLKPTR(p) != HBLKPTR((ptr_t)body)
|| sz < DEBUG_BYTES + EXTRA_BYTES) {
return 0;
}
if (((oh *)p) -> oh_sf != (START_FLAG ^ (word)body)
&& ((word *)p)[BYTES_TO_WORDS(sz)-1] != (END_FLAG ^ (word)body)) {
return 0;
}
if (((oh *)p)->oh_sz == sz) {
/* Object may have had debug info, but has been deallocated */
return -1;
}
return 1;
}
#endif /* !SHORT_DBG_HDRS */
#ifdef KEEP_BACK_PTRS
# include <stdlib.h>
# if defined(__GLIBC__) || defined(SOLARIS) \
|| 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. */
GC_INNER 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);
}
}
GC_INNER 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_API GC_ref_kind GC_CALL 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;
# ifdef LINT2
/* Explicitly instruct the code analysis tool that */
/* GC_get_back_ptr_info is not expected to be called with an */
/* incorrect "dest" value. */
if (!hdr) ABORT("Invalid GC_get_back_ptr_info argument");
# endif
if (!GC_HAS_DEBUG_INFO((ptr_t) hdr)) return GC_NO_SPACE;
bp = GC_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. */
GC_API void * GC_CALL GC_generate_random_heap_address(void)
{
size_t i;
word 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) {
size_t 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. */
GC_API void * GC_CALL GC_generate_random_valid_address(void)
{
ptr_t result;
ptr_t base;
do {
result = GC_generate_random_heap_address();
base = GC_base(result);
} while (base == 0 || !GC_is_marked(base));
return result;
}
/* Print back trace for p */
GC_API void GC_CALL 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_printf("\n");
for (i = 0; ; ++i) {
source = GC_get_back_ptr_info(current, &base, &offset);
if (GC_UNREFERENCED == source) {
GC_err_printf("Reference could not be found\n");
goto out;
}
if (GC_NO_SPACE == source) {
GC_err_printf("No debug info in object: Can't find reference\n");
goto out;
}
GC_err_printf("Reachable via %d levels of pointers from ", i);
switch(source) {
case GC_REFD_FROM_ROOT:
GC_err_printf("root at %p\n\n", base);
goto out;
case GC_REFD_FROM_REG:
GC_err_printf("root in register\n\n");
goto out;
case GC_FINALIZER_REFD:
GC_err_printf("list of finalizable objects\n\n");
goto out;
case GC_REFD_FROM_HEAP:
GC_err_printf("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_printf("\n");
break;
default:
GC_err_printf("INTERNAL ERROR: UNEXPECTED SOURCE!!!!\n");
goto out;
}
current = base;
}
out:;
}
/* Force a garbage collection and generate a backtrace from a */
/* random heap address. */
GC_INNER void GC_generate_random_backtrace_no_gc(void)
{
void * current;
current = GC_generate_random_valid_address();
GC_printf("\n****Chosen address %p in object\n", current);
GC_print_backtrace(current);
}
GC_API void GC_CALL GC_generate_random_backtrace(void)
{
if (GC_try_to_collect(GC_never_stop_func) == 0) {
GC_err_printf("Cannot generate a backtrace: "
"garbage collection is disabled!\n");
return;
}
GC_generate_random_backtrace_no_gc();
}
#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. */
/* This version assumes we do hold the allocation lock. */
STATIC ptr_t GC_store_debug_info_inner(ptr_t p, word sz, const char *string,
int linenum)
{
word * result = (word *)((oh *)p + 1);
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 = (word)linenum;
# 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);
}
GC_INNER ptr_t GC_store_debug_info(ptr_t p, word sz, const char *string,
int linenum)
{
ptr_t result;
DCL_LOCK_STATE;
LOCK();
result = GC_store_debug_info_inner(p, sz, string, linenum);
UNLOCK();
return result;
}
#ifndef SHORT_DBG_HDRS
/* Check the object with debugging info at ohdr. */
/* Return NULL if it's OK. Else return clobbered */
/* address. */
STATIC ptr_t GC_check_annotated_obj(oh *ohdr)
{
ptr_t body = (ptr_t)(ohdr + 1);
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 */
STATIC GC_describe_type_fn GC_describe_type_fns[MAXOBJKINDS] = {0};
GC_API void GC_CALL GC_register_describe_type_fn(int kind,
GC_describe_type_fn fn)
{
GC_describe_type_fns[kind] = fn;
}
/* Print a type description for the object whose client-visible address */
/* is p. */
STATIC void GC_print_type(ptr_t p)
{
hdr * hhdr = GC_find_header(p);
char buffer[GC_TYPE_DESCR_LEN + 1];
int kind = hhdr -> hb_obj_kind;
if (0 != GC_describe_type_fns[kind] && GC_is_marked(GC_base(p))) {
/* This should preclude free list objects except with */
/* thread-local allocation. */
buffer[GC_TYPE_DESCR_LEN] = 0;
(GC_describe_type_fns[kind])(p, buffer);
GC_ASSERT(buffer[GC_TYPE_DESCR_LEN] == 0);
GC_err_puts(buffer);
} else {
switch(kind) {
case PTRFREE:
GC_err_puts("PTRFREE");
break;
case NORMAL:
GC_err_puts("NORMAL");
break;
case UNCOLLECTABLE:
GC_err_puts("UNCOLLECTABLE");
break;
# ifdef ATOMIC_UNCOLLECTABLE
case AUNCOLLECTABLE:
GC_err_puts("ATOMIC UNCOLLECTABLE");
break;
# endif
case STUBBORN:
GC_err_puts("STUBBORN");
break;
default:
GC_err_printf("kind=%d descr=0x%lx", kind,
(unsigned long)(hhdr -> hb_descr));
}
}
}
#define GET_OH_LINENUM(ohdr) ((int)(ohdr)->oh_int)
/* Print a human-readable description of the object to stderr. p points */
/* to somewhere inside an object with the debugging info. */
STATIC void GC_print_obj(ptr_t p)
{
oh * ohdr = (oh *)GC_base(p);
GC_ASSERT(I_DONT_HOLD_LOCK());
# ifdef LINT2
if (!ohdr) ABORT("Invalid GC_print_obj argument");
# endif
GC_err_printf("%p (", ((ptr_t)ohdr + sizeof(oh)));
GC_err_puts(ohdr -> oh_string);
# ifdef SHORT_DBG_HDRS
GC_err_printf(":%d, ", GET_OH_LINENUM(ohdr));
# else
GC_err_printf(":%d, sz=%lu, ",
GET_OH_LINENUM(ohdr), (unsigned long)(ohdr -> oh_sz));
# endif
GC_print_type((ptr_t)(ohdr + 1));
GC_err_puts(")\n");
PRINT_CALL_CHAIN(ohdr);
}
STATIC void GC_debug_print_heap_obj_proc(ptr_t p)
{
GC_ASSERT(I_DONT_HOLD_LOCK());
if (GC_HAS_DEBUG_INFO(p)) {
GC_print_obj(p);
} else {
GC_default_print_heap_obj_proc(p);
}
}
#ifndef SHORT_DBG_HDRS
/* Use GC_err_printf and friends to print a description of the object */
/* whose client-visible address is p, and which was smashed at */
/* clobbered_addr. */
STATIC void GC_print_smashed_obj(const char *msg, ptr_t p,
ptr_t clobbered_addr)
{
oh * ohdr = (oh *)GC_base(p);
GC_ASSERT(I_DONT_HOLD_LOCK());
# ifdef LINT2
if (!ohdr) ABORT("Invalid GC_print_smashed_obj argument");
# endif
if (clobbered_addr <= (ptr_t)(&(ohdr -> oh_sz))
|| ohdr -> oh_string == 0) {
GC_err_printf(
"%s %p in or near object at %p(<smashed>, appr. sz = %lu)\n",
msg, clobbered_addr, p,
(unsigned long)(GC_size((ptr_t)ohdr) - DEBUG_BYTES));
} else {
GC_err_printf("%s %p in or near object at %p (%s:%d, sz=%lu)\n",
msg, clobbered_addr, p,
(word)(ohdr -> oh_string) < HBLKSIZE ? "(smashed string)" :
ohdr -> oh_string[0] == '\0' ? "EMPTY(smashed?)" :
ohdr -> oh_string,
GET_OH_LINENUM(ohdr), (unsigned long)(ohdr -> oh_sz));
PRINT_CALL_CHAIN(ohdr);
}
}
#endif
#ifndef SHORT_DBG_HDRS
STATIC void GC_check_heap_proc (void);
STATIC void GC_print_all_smashed_proc (void);
#else
STATIC void GC_do_nothing(void) {}
#endif
GC_INNER void GC_start_debugging(void)
{
# 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));
}
size_t GC_debug_header_size = sizeof(oh);
GC_API void GC_CALL GC_debug_register_displacement(size_t offset)
{
GC_register_displacement(offset);
GC_register_displacement((word)sizeof(oh) + offset);
}
GC_API void * GC_CALL GC_debug_malloc(size_t lb, GC_EXTRA_PARAMS)
{
void * result;
/* Note that according to malloc() specification, if size is 0 then */
/* malloc() returns either NULL, or a unique pointer value that can */
/* later be successfully passed to free(). We always do the latter. */
result = GC_malloc(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc(%lu) returning NULL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf(":%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, i));
}
GC_API void * GC_CALL GC_debug_malloc_ignore_off_page(size_t lb,
GC_EXTRA_PARAMS)
{
void * result = GC_malloc_ignore_off_page(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_ignore_off_page(%lu) returning NULL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf(":%lu)\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, i));
}
GC_API void * GC_CALL GC_debug_malloc_atomic_ignore_off_page(size_t lb,
GC_EXTRA_PARAMS)
{
void * result = GC_malloc_atomic_ignore_off_page(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_atomic_ignore_off_page(%lu)"
" returning NULL (", (unsigned long)lb);
GC_err_puts(s);
GC_err_printf(":%lu)\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, 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_INNER void * GC_debug_generic_malloc_inner(size_t lb, int k)
{
void * result = GC_generic_malloc_inner(lb + DEBUG_BYTES, k);
if (result == 0) {
GC_err_printf("GC internal allocation (%lu bytes) returning NULL\n",
(unsigned long) lb);
return(0);
}
ADD_CALL_CHAIN(result, GC_RETURN_ADDR);
return (GC_store_debug_info_inner(result, (word)lb, "INTERNAL", 0));
}
GC_INNER void * GC_debug_generic_malloc_inner_ignore_off_page(size_t lb,
int k)
{
void * result = GC_generic_malloc_inner_ignore_off_page(
lb + DEBUG_BYTES, k);
if (result == 0) {
GC_err_printf("GC internal allocation (%lu bytes) returning NULL\n",
(unsigned long) lb);
return(0);
}
ADD_CALL_CHAIN(result, GC_RETURN_ADDR);
return (GC_store_debug_info_inner(result, (word)lb, "INTERNAL", 0));
}
#endif /* DBG_HDRS_ALL */
#ifdef STUBBORN_ALLOC
GC_API void * GC_CALL GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
{
void * result = GC_malloc_stubborn(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc(%lu) returning NULL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf(":%lu)\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, i));
}
GC_API void GC_CALL GC_debug_change_stubborn(void *p)
{
void * q = GC_base(p);
hdr * hhdr;
if (q == 0) {
GC_err_printf("Bad argument: %p to GC_debug_change_stubborn\n", p);
ABORT("GC_debug_change_stubborn: bad arg");
}
hhdr = HDR(q);
if (hhdr -> hb_obj_kind != STUBBORN) {
GC_err_printf("GC_debug_change_stubborn arg not stubborn: %p\n", p);
ABORT("GC_debug_change_stubborn: arg not stubborn");
}
GC_change_stubborn(q);
}
GC_API void GC_CALL GC_debug_end_stubborn_change(void *p)
{
void * q = GC_base(p);
hdr * hhdr;
if (q == 0) {
GC_err_printf("Bad argument: %p to GC_debug_end_stubborn_change\n", p);
ABORT("GC_debug_end_stubborn_change: bad arg");
}
hhdr = HDR(q);
if (hhdr -> hb_obj_kind != STUBBORN) {
GC_err_printf("debug_end_stubborn_change arg not stubborn: %p\n", p);
ABORT("GC_debug_end_stubborn_change: arg not stubborn");
}
GC_end_stubborn_change(q);
}
#else /* !STUBBORN_ALLOC */
GC_API void * GC_CALL GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
{
return GC_debug_malloc(lb, OPT_RA s, i);
}
/*ARGSUSED*/
GC_API void GC_CALL GC_debug_change_stubborn(void *p) {}
/*ARGSUSED*/
GC_API void GC_CALL GC_debug_end_stubborn_change(void *p) {}
#endif /* !STUBBORN_ALLOC */
GC_API void * GC_CALL GC_debug_malloc_atomic(size_t lb, GC_EXTRA_PARAMS)
{
void * result = GC_malloc_atomic(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_atomic(%lu) returning NULL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf(":%lu)\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, i));
}
GC_API char * GC_CALL GC_debug_strdup(const char *str, GC_EXTRA_PARAMS)
{
char *copy;
size_t lb;
if (str == NULL) {
if (GC_find_leak)
GC_err_printf("strdup(NULL) behavior is undefined\n");
return NULL;
}
lb = strlen(str) + 1;
copy = GC_debug_malloc_atomic(lb, OPT_RA s, i);
if (copy == NULL) {
# ifndef MSWINCE
errno = ENOMEM;
# endif
return NULL;
}
# ifndef MSWINCE
strcpy(copy, str);
# else
/* strcpy() is deprecated in WinCE */
memcpy(copy, str, lb);
# endif
return copy;
}
GC_API char * GC_CALL GC_debug_strndup(const char *str, size_t size,
GC_EXTRA_PARAMS)
{
char *copy;
size_t len = strlen(str); /* str is expected to be non-NULL */
if (len > size)
len = size;
copy = GC_debug_malloc_atomic(len + 1, OPT_RA s, i);
if (copy == NULL) {
# ifndef MSWINCE
errno = ENOMEM;
# endif
return NULL;
}
BCOPY(str, copy, len);
copy[len] = '\0';
return copy;
}
#ifdef GC_REQUIRE_WCSDUP
# include <wchar.h> /* for wcslen() */
GC_API wchar_t * GC_CALL GC_debug_wcsdup(const wchar_t *str, GC_EXTRA_PARAMS)
{
size_t lb = (wcslen(str) + 1) * sizeof(wchar_t);
wchar_t *copy = GC_debug_malloc_atomic(lb, OPT_RA s, i);
if (copy == NULL) {
# ifndef MSWINCE
errno = ENOMEM;
# endif
return NULL;
}
BCOPY(str, copy, lb);
return copy;
}
#endif /* GC_REQUIRE_WCSDUP */
GC_API void * GC_CALL GC_debug_malloc_uncollectable(size_t lb,
GC_EXTRA_PARAMS)
{
void * result = GC_malloc_uncollectable(lb + UNCOLLECTABLE_DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_uncollectable(%lu) returning NULL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf(":%lu)\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, i));
}
#ifdef ATOMIC_UNCOLLECTABLE
GC_API void * GC_CALL GC_debug_malloc_atomic_uncollectable(size_t lb,
GC_EXTRA_PARAMS)
{
void * result =
GC_malloc_atomic_uncollectable(lb + UNCOLLECTABLE_DEBUG_BYTES);
if (result == 0) {
GC_err_printf(
"GC_debug_malloc_atomic_uncollectable(%lu) returning NULL (",
(unsigned long) lb);
GC_err_puts(s);
GC_err_printf(":%lu)\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, i));
}
#endif /* ATOMIC_UNCOLLECTABLE */
#ifndef GC_FREED_MEM_MARKER
# if CPP_WORDSZ == 32
# define GC_FREED_MEM_MARKER 0xdeadbeef
# else
# define GC_FREED_MEM_MARKER GC_WORD_C(0xEFBEADDEdeadbeef)
# endif
#endif
GC_API void GC_CALL GC_debug_free(void * p)
{
ptr_t base;
if (0 == p) return;
base = GC_base(p);
if (base == 0) {
GC_err_printf("Attempt to free invalid pointer %p\n", p);
ABORT("Invalid pointer passed to free()");
}
if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
GC_err_printf(
"GC_debug_free called on pointer %p w/o debugging info\n", p);
} else {
# ifndef SHORT_DBG_HDRS
ptr_t clobbered = GC_check_annotated_obj((oh *)base);
word sz = GC_size(base);
if (clobbered != 0) {
GC_have_errors = TRUE;
if (((oh *)base) -> oh_sz == sz) {
GC_print_smashed_obj(
"GC_debug_free: found previously deallocated (?) object at",
p, clobbered);
return; /* ignore double free */
} else {
GC_print_smashed_obj("GC_debug_free: found smashed location at",
p, clobbered);
}
}
/* Invalidate size (mark the object as deallocated) */
((oh *)base) -> oh_sz = sz;
# endif /* SHORT_DBG_HDRS */
}
if (GC_find_leak
# ifndef SHORT_DBG_HDRS
&& ((ptr_t)p - (ptr_t)base != sizeof(oh) || !GC_findleak_delay_free)
# endif
) {
GC_free(base);
} else {
hdr * hhdr = HDR(p);
if (hhdr -> hb_obj_kind == UNCOLLECTABLE
# ifdef ATOMIC_UNCOLLECTABLE
|| hhdr -> hb_obj_kind == AUNCOLLECTABLE
# endif
) {
GC_free(base);
} else {
size_t i;
size_t obj_sz = BYTES_TO_WORDS(hhdr -> hb_sz - sizeof(oh));
for (i = 0; i < obj_sz; ++i)
((word *)p)[i] = GC_FREED_MEM_MARKER;
GC_ASSERT((word *)p + i == (word *)(base + hhdr -> hb_sz));
}
} /* !GC_find_leak */
}
#if defined(THREADS) && defined(DBG_HDRS_ALL)
/* Used internally; we assume it's called correctly. */
GC_INNER void GC_debug_free_inner(void * p)
{
ptr_t base = GC_base(p);
GC_ASSERT((ptr_t)p - (ptr_t)base == sizeof(oh));
# ifdef LINT2
if (!base) ABORT("Invalid GC_debug_free_inner argument");
# endif
# ifndef SHORT_DBG_HDRS
/* Invalidate size */
((oh *)base) -> oh_sz = GC_size(base);
# endif
GC_free_inner(base);
}
#endif
GC_API void * GC_CALL GC_debug_realloc(void * p, size_t lb, GC_EXTRA_PARAMS)
{
void * base;
void * result;
hdr * hhdr;
if (p == 0)
return(GC_debug_malloc(lb, OPT_RA s, i));
base = GC_base(p);
if (base == 0) {
GC_err_printf("Attempt to reallocate invalid pointer %p\n", p);
ABORT("Invalid pointer passed to realloc()");
}
if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
GC_err_printf(
"GC_debug_realloc called on pointer %p w/o debugging info\n", 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:
result = NULL; /* initialized to prevent warning. */
GC_err_printf("GC_debug_realloc: encountered bad kind\n");
ABORT("Bad kind");
}
if (result != NULL) {
size_t old_sz;
# ifdef SHORT_DBG_HDRS
old_sz = GC_size(base) - sizeof(oh);
# else
old_sz = ((oh *)base) -> oh_sz;
# endif
BCOPY(p, result, old_sz < lb ? old_sz : lb);
GC_debug_free(p);
}
return(result);
}
#ifndef SHORT_DBG_HDRS
/* List of smashed (clobbered) locations. 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. */
#ifndef MAX_SMASHED
# define MAX_SMASHED 20
#endif
STATIC ptr_t GC_smashed[MAX_SMASHED] = {0};
STATIC unsigned GC_n_smashed = 0;
STATIC void GC_add_smashed(ptr_t smashed)
{
GC_ASSERT(GC_is_marked(GC_base(smashed)));
/* FIXME: Prevent adding an object while printing smashed list. */
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. */
STATIC void GC_print_all_smashed_proc(void)
{
unsigned i;
GC_ASSERT(I_DONT_HOLD_LOCK());
if (GC_n_smashed == 0) return;
GC_err_printf("GC_check_heap_block: found smashed heap objects:\n");
for (i = 0; i < GC_n_smashed; ++i) {
GC_print_smashed_obj("", (ptr_t)GC_base(GC_smashed[i]) + sizeof(oh),
GC_smashed[i]);
GC_smashed[i] = 0;
}
GC_n_smashed = 0;
GC_err_printf("\n");
}
/* Check all marked objects in the given block for validity */
/* Avoid GC_apply_to_each_object for performance reasons. */
/*ARGSUSED*/
STATIC void GC_check_heap_block(struct hblk *hbp, word dummy)
{
struct hblkhdr * hhdr = HDR(hbp);
size_t sz = hhdr -> hb_sz;
size_t bit_no;
char *p, *plim;
p = hbp->hb_body;
if (sz > MAXOBJBYTES) {
plim = p;
} else {
plim = hbp->hb_body + HBLKSIZE - sz;
}
/* go through all words in block */
for (bit_no = 0; p <= plim; bit_no += MARK_BIT_OFFSET(sz), p += sz) {
if (mark_bit_from_hdr(hhdr, bit_no) && GC_HAS_DEBUG_INFO((ptr_t)p)) {
ptr_t clobbered = GC_check_annotated_obj((oh *)p);
if (clobbered != 0)
GC_add_smashed(clobbered);
}
}
}
/* This assumes that all accessible objects are marked, and that */
/* I hold the allocation lock. Normally called by collector. */
STATIC void GC_check_heap_proc(void)
{
GC_STATIC_ASSERT((sizeof(oh) & (GRANULE_BYTES - 1)) == 0);
/* FIXME: Should we check for twice that alignment? */
GC_apply_to_all_blocks(GC_check_heap_block, 0);
}
GC_INNER GC_bool GC_check_leaked(ptr_t base)
{
size_t i;
size_t obj_sz;
word *p;
if (
# if defined(KEEP_BACK_PTRS) || defined(MAKE_BACK_GRAPH)
(*(word *)base & 1) != 0 &&
# endif
GC_has_other_debug_info(base) >= 0)
return TRUE; /* object has leaked */
/* Validate freed object's content. */
p = (word *)(base + sizeof(oh));
obj_sz = BYTES_TO_WORDS(HDR(base)->hb_sz - sizeof(oh));
for (i = 0; i < obj_sz; ++i)
if (p[i] != GC_FREED_MEM_MARKER) {
GC_set_mark_bit(base); /* do not reclaim it in this cycle */
GC_add_smashed((ptr_t)(&p[i])); /* alter-after-free detected */
break; /* don't report any other smashed locations in the object */
}
return FALSE; /* GC_debug_free() has been called */
}
#endif /* !SHORT_DBG_HDRS */
struct closure {
GC_finalization_proc cl_fn;
void * cl_data;
};
STATIC void * GC_make_closure(GC_finalization_proc fn, void * data)
{
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
if (result != 0) {
result -> cl_fn = fn;
result -> cl_data = data;
}
return((void *)result);
}
/* An auxiliary fns to make finalization work correctly with displaced */
/* pointers introduced by the debugging allocators. */
STATIC void GC_CALLBACK GC_debug_invoke_finalizer(void * obj, void * data)
{
struct closure * cl = (struct closure *) data;
(*(cl -> cl_fn))((void *)((char *)obj + sizeof(oh)), cl -> cl_data);
}
/* Special finalizer_proc value to detect GC_register_finalizer() failure. */
#define OFN_UNSET (GC_finalization_proc)(signed_word)-1
/* Set ofn and ocd to reflect the values we got back. */
static void store_old(void *obj, GC_finalization_proc my_old_fn,
struct closure *my_old_cd, GC_finalization_proc *ofn,
void **ocd)
{
if (0 != my_old_fn) {
if (my_old_fn == OFN_UNSET) {
/* register_finalizer() failed; (*ofn) and (*ocd) are unchanged. */
return;
}
if (my_old_fn != GC_debug_invoke_finalizer) {
GC_err_printf("Debuggable object at %p had a 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;
}
}
GC_API void GC_CALL GC_debug_register_finalizer(void * obj,
GC_finalization_proc fn,
void * cd, GC_finalization_proc *ofn,
void * *ocd)
{
GC_finalization_proc my_old_fn = OFN_UNSET;
void * my_old_cd;
ptr_t base = GC_base(obj);
if (0 == base) {
/* We won't collect it, hence finalizer wouldn't be run. */
if (ocd) *ocd = 0;
if (ofn) *ofn = 0;
return;
}
if ((ptr_t)obj - base != sizeof(oh)) {
GC_err_printf(
"GC_debug_register_finalizer called with non-base-pointer %p\n",
obj);
}
if (0 == fn) {
GC_register_finalizer(base, 0, 0, &my_old_fn, &my_old_cd);
} else {
cd = GC_make_closure(fn, cd);
if (cd == 0) return; /* out of memory */
GC_register_finalizer(base, GC_debug_invoke_finalizer,
cd, &my_old_fn, &my_old_cd);
}
store_old(obj, my_old_fn, (struct closure *)my_old_cd, ofn, ocd);
}
GC_API void GC_CALL GC_debug_register_finalizer_no_order
(void * obj, GC_finalization_proc fn,
void * cd, GC_finalization_proc *ofn,
void * *ocd)
{
GC_finalization_proc my_old_fn = OFN_UNSET;
void * my_old_cd;
ptr_t base = GC_base(obj);
if (0 == base) {
/* We won't collect it, hence finalizer wouldn't be run. */
if (ocd) *ocd = 0;
if (ofn) *ofn = 0;
return;
}
if ((ptr_t)obj - base != sizeof(oh)) {
GC_err_printf(
"GC_debug_register_finalizer_no_order called with "
"non-base-pointer %p\n",
obj);
}
if (0 == fn) {
GC_register_finalizer_no_order(base, 0, 0, &my_old_fn, &my_old_cd);
} else {
cd = GC_make_closure(fn, cd);
if (cd == 0) return; /* out of memory */
GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
cd, &my_old_fn, &my_old_cd);
}
store_old(obj, my_old_fn, (struct closure *)my_old_cd, ofn, ocd);
}
GC_API void GC_CALL GC_debug_register_finalizer_unreachable
(void * obj, GC_finalization_proc fn,
void * cd, GC_finalization_proc *ofn,
void * *ocd)
{
GC_finalization_proc my_old_fn = OFN_UNSET;
void * my_old_cd;
ptr_t base = GC_base(obj);
if (0 == base) {
/* We won't collect it, hence finalizer wouldn't be run. */
if (ocd) *ocd = 0;
if (ofn) *ofn = 0;
return;
}
if ((ptr_t)obj - base != sizeof(oh)) {
GC_err_printf(
"GC_debug_register_finalizer_unreachable called with "
"non-base-pointer %p\n",
obj);
}
if (0 == fn) {
GC_register_finalizer_unreachable(base, 0, 0, &my_old_fn, &my_old_cd);
} else {
cd = GC_make_closure(fn, cd);
if (cd == 0) return; /* out of memory */
GC_register_finalizer_unreachable(base, GC_debug_invoke_finalizer,
cd, &my_old_fn, &my_old_cd);
}
store_old(obj, my_old_fn, (struct closure *)my_old_cd, ofn, ocd);
}
GC_API void GC_CALL GC_debug_register_finalizer_ignore_self
(void * obj, GC_finalization_proc fn,
void * cd, GC_finalization_proc *ofn,
void * *ocd)
{
GC_finalization_proc my_old_fn = OFN_UNSET;
void * my_old_cd;
ptr_t base = GC_base(obj);
if (0 == base) {
/* We won't collect it, hence finalizer wouldn't be run. */
if (ocd) *ocd = 0;
if (ofn) *ofn = 0;
return;
}
if ((ptr_t)obj - base != sizeof(oh)) {
GC_err_printf(
"GC_debug_register_finalizer_ignore_self called with "
"non-base-pointer %p\n", obj);
}
if (0 == fn) {
GC_register_finalizer_ignore_self(base, 0, 0, &my_old_fn, &my_old_cd);
} else {
cd = GC_make_closure(fn, cd);
if (cd == 0) return; /* out of memory */
GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
cd, &my_old_fn, &my_old_cd);
}
store_old(obj, my_old_fn, (struct closure *)my_old_cd, ofn, ocd);
}
GC_API void * GC_CALL GC_debug_malloc_replacement(size_t lb)
{
return GC_debug_malloc(lb, GC_DBG_RA "unknown", 0);
}
GC_API void * GC_CALL GC_debug_realloc_replacement(void *p, size_t lb)
{
return GC_debug_realloc(p, lb, GC_DBG_RA "unknown", 0);
}