* 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 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.
* 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"
-/* 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? */
+#include "dbg_mlc.h"
-# 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. */
+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));
-/* 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. */
return(FALSE);
}
-/* Return start of object that might have debugging info. */
-ptr_t GC_debug_object_start(p)
-ptr_t p;
-{
- register word * result = (word *)((oh *)p + 1);
- if (! GC_has_debug_info(p))
- return(p);
- return((ptr_t)result);
-}
+#ifdef KEEP_BACK_PTRS
+ /* 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 = (ptr_t)HIDE_POINTER(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 = hdr -> oh_back_ptr;
+ if (MARKED_FOR_FINALIZATION == bp) return GC_FINALIZER_REFD;
+ if (MARKED_FROM_REGISTER == bp) return GC_REFD_FROM_REG;
+ if (0 == bp) return GC_UNREFERENCED;
+ bp = REVEAL_POINTER(bp);
+ 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;
+ int heap_offset = random() % GC_heapsize;
+ 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 */
/* Store debugging info into p. Return displaced pointer. */
/* Assumes we don't hold allocation lock. */
/* But that's expensive. And this way things should only appear */
/* inconsistent while we're in the handler. */
LOCK();
+# ifdef KEEP_BACK_PTRS
+ ((oh *)p) -> oh_back_ptr = 0;
+# endif
((oh *)p) -> oh_string = string;
((oh *)p) -> oh_int = integer;
((oh *)p) -> oh_sz = sz;
return((ptr_t)result);
}
-/* Check the object with debugging info at p */
+/* 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 = (oh *)GC_base(p);
- GC_err_printf1("0x%lx (", (unsigned long)ohdr + sizeof(oh));
+ GC_err_printf1("0x%lx (", ((unsigned long)ohdr + sizeof(oh)));
GC_err_puts(ohdr -> oh_string);
GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
(unsigned long)(ohdr -> oh_sz));
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);
+ (GC_size((ptr_t)ohdr) - DEBUG_BYTES));
} else {
if (ohdr -> oh_string[0] == '\0') {
GC_err_puts("EMPTY(smashed?)");
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)
+ GC_PTR GC_debug_malloc(size_t lb, GC_EXTRA_PARAMS)
# else
GC_PTR GC_debug_malloc(lb, s, i)
size_t lb;
}
# ifdef __STDC__
- GC_PTR GC_debug_generic_malloc(size_t lb, int k, EXTRA_ARGS)
+ GC_PTR GC_debug_generic_malloc(size_t lb, int k, GC_EXTRA_PARAMS)
# else
GC_PTR GC_debug_malloc(lb, k, s, i)
size_t lb;
#ifdef STUBBORN_ALLOC
# ifdef __STDC__
- GC_PTR GC_debug_malloc_stubborn(size_t lb, EXTRA_ARGS)
+ 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;
GC_end_stubborn_change(q);
}
-#endif /* STUBBORN_ALLOC */
+#else /* !STUBBORN_ALLOC */
# ifdef __STDC__
- GC_PTR GC_debug_malloc_atomic(size_t lb, EXTRA_ARGS)
+ 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;
}
# ifdef __STDC__
- GC_PTR GC_debug_malloc_uncollectable(size_t lb, EXTRA_ARGS)
+ 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;
#ifdef ATOMIC_UNCOLLECTABLE
# ifdef __STDC__
- GC_PTR GC_debug_malloc_atomic_uncollectable(size_t lb, EXTRA_ARGS)
+ 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;
GC_PTR p;
# endif
{
- register GC_PTR base = GC_base(p);
+ 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);
- if (p != 0) ABORT("free(invalid pointer)");
+ ABORT("free(invalid pointer)");
}
if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
GC_err_printf1(
GC_err_printf0(
"GC_debug_free: found previously deallocated (?) object at ");
} else {
- GC_err_printf0("GC_debug_free: found smashed object at ");
+ 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);
}
-# ifdef FIND_LEAK
+ if (GC_find_leak) {
GC_free(base);
-# else
- {
- register hdr * hhdr = HDR(p);
- GC_bool uncollectable = FALSE;
+ } 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);
+ if (hhdr -> hb_obj_kind == UNCOLLECTABLE) {
+ uncollectable = TRUE;
}
-# endif
+# ifdef ATOMIC_UNCOLLECTABLE
+ if (hhdr -> hb_obj_kind == AUNCOLLECTABLE) {
+ uncollectable = TRUE;
+ }
+# endif
+ if (uncollectable) GC_free(base);
+ } /* !GC_find_leak */
}
# ifdef __STDC__
- GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, EXTRA_ARGS)
+ 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;
}
clobbered = GC_check_annotated_obj((oh *)base);
if (clobbered != 0) {
- GC_err_printf0("GC_debug_realloc: found smashed object at ");
+ GC_err_printf0("GC_debug_realloc: found smashed location at ");
GC_print_smashed_obj(p, clobbered);
}
old_sz = ((oh *)base) -> oh_sz;
if (clobbered != 0) {
GC_err_printf0(
- "GC_check_heap_block: found smashed object at ");
+ "GC_check_heap_block: found smashed location at ");
GC_print_smashed_obj((ptr_t)p, clobbered);
}
}
}
# ifdef __STDC__
- void GC_debug_register_finalizer_ignore_self
+ 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_ignore_self
+ void GC_debug_register_finalizer_no_order
(obj, fn, cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc fn;
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_no_order 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);
-}
+ GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
+ GC_make_closure(fn,cd), ofn, ocd);
+ }
# ifdef __STDC__
- void GC_debug_register_finalizer_no_order
+ 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_no_order
+ void GC_debug_register_finalizer_ignore_self
(obj, fn, cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc fn;
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",
+ "GC_register_finalizer_ignore_self called with non-base-pointer 0x%lx\n",
obj);
}
- GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
+ GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
GC_make_closure(fn,cd), ofn, ocd);
}
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