-/*
+/*
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* modified is included with the above copyright notice.
*/
+#include "private/gc_pmark.h"
+
/*
* These are checking routines calls to which could be inserted by a
* preprocessor to validate C pointer arithmetic.
*/
-#include "private/gc_pmark.h"
-
STATIC void GC_CALLBACK GC_default_same_obj_print_proc(void * p, void * q)
{
GC_err_printf("%p and %p are not in the same object\n", p, q);
}
void (GC_CALLBACK *GC_same_obj_print_proc) (void *, void *)
- = GC_default_same_obj_print_proc;
+ = GC_default_same_obj_print_proc;
-/* Check that p and q point to the same object. Call */
-/* *GC_same_obj_print_proc if they don't. */
-/* Returns the first argument. (Return value may be hard */
-/* to use,due to typing issues. But if we had a suitable */
-/* preprocessor ...) */
-/* Succeeds if neither p nor q points to the heap. */
-/* We assume this is performance critical. (It shouldn't */
-/* be called by production code, but this can easily make */
-/* debugging intolerably slow.) */
+/* Check that p and q point to the same object. Call */
+/* *GC_same_obj_print_proc if they don't. */
+/* Returns the first argument. (Return value may be hard */
+/* to use,due to typing issues. But if we had a suitable */
+/* preprocessor ...) */
+/* Succeeds if neither p nor q points to the heap. */
+/* We assume this is performance critical. (It shouldn't */
+/* be called by production code, but this can easily make */
+/* debugging intolerably slow.) */
GC_API void * GC_CALL GC_same_obj(void *p, void *q)
{
struct hblk *h;
hdr *hhdr;
ptr_t base, limit;
word sz;
-
+
if (!GC_is_initialized) GC_init();
hhdr = HDR((word)p);
if (hhdr == 0) {
- if (divHBLKSZ((word)p) != divHBLKSZ((word)q)
- && HDR((word)q) != 0) {
- goto fail;
- }
- return(p);
+ if (divHBLKSZ((word)p) != divHBLKSZ((word)q)
+ && HDR((word)q) != 0) {
+ goto fail;
+ }
+ return(p);
}
- /* If it's a pointer to the middle of a large object, move it */
- /* to the beginning. */
+ /* If it's a pointer to the middle of a large object, move it */
+ /* to the beginning. */
if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
- h = HBLKPTR(p) - (word)hhdr;
- hhdr = HDR(h);
- while (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
- h = FORWARDED_ADDR(h, hhdr);
- hhdr = HDR(h);
- }
- limit = (ptr_t)h + hhdr -> hb_sz;
- if ((ptr_t)p >= limit || (ptr_t)q >= limit || (ptr_t)q < (ptr_t)h ) {
- goto fail;
- }
- return(p);
+ h = HBLKPTR(p) - (word)hhdr;
+ hhdr = HDR(h);
+ while (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
+ h = FORWARDED_ADDR(h, hhdr);
+ hhdr = HDR(h);
+ }
+ limit = (ptr_t)h + hhdr -> hb_sz;
+ if ((ptr_t)p >= limit || (ptr_t)q >= limit || (ptr_t)q < (ptr_t)h ) {
+ goto fail;
+ }
+ return(p);
}
sz = hhdr -> hb_sz;
if (sz > MAXOBJBYTES) {
} else {
size_t offset;
size_t pdispl = HBLKDISPL(p);
-
+
offset = pdispl % sz;
if (HBLKPTR(p) != HBLKPTR(q)) goto fail;
- /* W/o this check, we might miss an error if */
- /* q points to the first object on a page, and */
- /* points just before the page. */
+ /* W/o this check, we might miss an error if */
+ /* q points to the first object on a page, and */
+ /* points just before the page. */
base = (ptr_t)p - offset;
limit = base + sz;
}
- /* [base, limit) delimits the object containing p, if any. */
- /* If p is not inside a valid object, then either q is */
- /* also outside any valid object, or it is outside */
- /* [base, limit). */
+ /* [base, limit) delimits the object containing p, if any. */
+ /* If p is not inside a valid object, then either q is */
+ /* also outside any valid object, or it is outside */
+ /* [base, limit). */
if ((ptr_t)q >= limit || (ptr_t)q < base) {
- goto fail;
+ goto fail;
}
return(p);
fail:
ABORT("GC_is_valid_displacement test failed");
}
-void (GC_CALLBACK *GC_is_valid_displacement_print_proc)(void *) =
- GC_default_is_valid_displacement_print_proc;
+void (GC_CALLBACK *GC_is_valid_displacement_print_proc)(void *) =
+ GC_default_is_valid_displacement_print_proc;
-/* Check that if p is a pointer to a heap page, then it points to */
-/* a valid displacement within a heap object. */
-/* Uninteresting with GC_all_interior_pointers. */
-/* Always returns its argument. */
-/* Note that we don't lock, since nothing relevant about the header */
-/* should change while we have a valid object pointer to the block. */
+/* Check that if p is a pointer to a heap page, then it points to */
+/* a valid displacement within a heap object. */
+/* Uninteresting with GC_all_interior_pointers. */
+/* Always returns its argument. */
+/* Note that we don't lock, since nothing relevant about the header */
+/* should change while we have a valid object pointer to the block. */
GC_API void * GC_CALL GC_is_valid_displacement(void *p)
{
hdr *hhdr;
word offset;
struct hblk *h;
word sz;
-
+
if (!GC_is_initialized) GC_init();
hhdr = HDR((word)p);
if (hhdr == 0) return(p);
h = HBLKPTR(p);
if (GC_all_interior_pointers) {
- while (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
- h = FORWARDED_ADDR(h, hhdr);
- hhdr = HDR(h);
- }
+ while (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
+ h = FORWARDED_ADDR(h, hhdr);
+ hhdr = HDR(h);
+ }
}
if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
- goto fail;
+ goto fail;
}
sz = hhdr -> hb_sz;
pdispl = HBLKDISPL(p);
offset = pdispl % sz;
if ((sz > MAXOBJBYTES && (ptr_t)p >= (ptr_t)h + sz)
- || !GC_valid_offsets[offset]
- || (ptr_t)p - offset + sz > (ptr_t)(h + 1)) {
- goto fail;
+ || !GC_valid_offsets[offset]
+ || (ptr_t)p - offset + sz > (ptr_t)(h + 1)) {
+ goto fail;
}
return(p);
fail:
}
void (GC_CALLBACK *GC_is_visible_print_proc)(void * p) =
- GC_default_is_visible_print_proc;
+ GC_default_is_visible_print_proc;
#ifndef THREADS
/* Could p be a stack address? */
STATIC GC_bool GC_on_stack(ptr_t p)
{
- int dummy;
-# ifdef STACK_GROWS_DOWN
- if ((ptr_t)p >= (ptr_t)(&dummy) && (ptr_t)p < GC_stackbottom ) {
- return(TRUE);
- }
-# else
- if ((ptr_t)p <= (ptr_t)(&dummy) && (ptr_t)p > GC_stackbottom ) {
- return(TRUE);
- }
-# endif
- return(FALSE);
+ int dummy;
+# ifdef STACK_GROWS_DOWN
+ if ((ptr_t)p >= (ptr_t)(&dummy) && (ptr_t)p < GC_stackbottom ) {
+ return(TRUE);
+ }
+# else
+ if ((ptr_t)p <= (ptr_t)(&dummy) && (ptr_t)p > GC_stackbottom ) {
+ return(TRUE);
+ }
+# endif
+ return(FALSE);
}
#endif
-/* Check that p is visible */
-/* to the collector as a possibly pointer containing location. */
-/* If it isn't invoke *GC_is_visible_print_proc. */
-/* Returns the argument in all cases. May erroneously succeed */
-/* in hard cases. (This is intended for debugging use with */
-/* untyped allocations. The idea is that it should be possible, though */
-/* slow, to add such a call to all indirect pointer stores.) */
-/* Currently useless for multithreaded worlds. */
+/* Check that p is visible */
+/* to the collector as a possibly pointer containing location. */
+/* If it isn't invoke *GC_is_visible_print_proc. */
+/* Returns the argument in all cases. May erroneously succeed */
+/* in hard cases. (This is intended for debugging use with */
+/* untyped allocations. The idea is that it should be possible, though */
+/* slow, to add such a call to all indirect pointer stores.) */
+/* Currently useless for multithreaded worlds. */
GC_API void * GC_CALL GC_is_visible(void *p)
{
hdr *hhdr;
-
+
if ((word)p & (ALIGNMENT - 1)) goto fail;
if (!GC_is_initialized) GC_init();
# ifdef THREADS
- hhdr = HDR((word)p);
+ hhdr = HDR((word)p);
if (hhdr != 0 && GC_base(p) == 0) {
goto fail;
} else {
return(p);
}
# else
- /* Check stack first: */
- if (GC_on_stack(p)) return(p);
- hhdr = HDR((word)p);
- if (hhdr == 0) {
- if (GC_is_static_root(p)) return(p);
- /* Else do it again correctly: */
+ /* Check stack first: */
+ if (GC_on_stack(p)) return(p);
+ hhdr = HDR((word)p);
+ if (hhdr == 0) {
+ if (GC_is_static_root(p)) return(p);
+ /* Else do it again correctly: */
# if (defined(DYNAMIC_LOADING) || defined(MSWIN32) || \
- defined(MSWINCE) || defined(PCR))
- GC_register_dynamic_libraries();
- if (GC_is_static_root(p))
- return(p);
-# endif
- goto fail;
- } else {
- /* p points to the heap. */
- word descr;
- ptr_t base = GC_base(p); /* Should be manually inlined? */
-
- if (base == 0) goto fail;
- if (HBLKPTR(base) != HBLKPTR(p)) hhdr = HDR((word)p);
- descr = hhdr -> hb_descr;
+ defined(MSWINCE) || defined(PCR))
+ GC_register_dynamic_libraries();
+ if (GC_is_static_root(p))
+ return(p);
+# endif
+ goto fail;
+ } else {
+ /* p points to the heap. */
+ word descr;
+ ptr_t base = GC_base(p); /* Should be manually inlined? */
+
+ if (base == 0) goto fail;
+ if (HBLKPTR(base) != HBLKPTR(p)) hhdr = HDR((word)p);
+ descr = hhdr -> hb_descr;
retry:
- switch(descr & GC_DS_TAGS) {
- case GC_DS_LENGTH:
- if ((word)((ptr_t)p - (ptr_t)base) > (word)descr) goto fail;
- break;
- case GC_DS_BITMAP:
- if ((ptr_t)p - (ptr_t)base
- >= WORDS_TO_BYTES(BITMAP_BITS)
- || ((word)p & (sizeof(word) - 1))) goto fail;
- if (!(((word)1 << (WORDSZ - ((ptr_t)p - (ptr_t)base) - 1))
- & descr)) goto fail;
- break;
- case GC_DS_PROC:
- /* We could try to decipher this partially. */
- /* For now we just punt. */
- break;
- case GC_DS_PER_OBJECT:
- if ((signed_word)descr >= 0) {
- descr = *(word *)((ptr_t)base + (descr & ~GC_DS_TAGS));
- } else {
- ptr_t type_descr = *(ptr_t *)base;
- descr = *(word *)(type_descr
- - (descr - (GC_DS_PER_OBJECT
- - GC_INDIR_PER_OBJ_BIAS)));
- }
- goto retry;
- }
- return(p);
- }
+ switch(descr & GC_DS_TAGS) {
+ case GC_DS_LENGTH:
+ if ((word)((ptr_t)p - (ptr_t)base) > (word)descr) goto fail;
+ break;
+ case GC_DS_BITMAP:
+ if ((ptr_t)p - (ptr_t)base
+ >= WORDS_TO_BYTES(BITMAP_BITS)
+ || ((word)p & (sizeof(word) - 1))) goto fail;
+ if (!(((word)1 << (WORDSZ - ((ptr_t)p - (ptr_t)base) - 1))
+ & descr)) goto fail;
+ break;
+ case GC_DS_PROC:
+ /* We could try to decipher this partially. */
+ /* For now we just punt. */
+ break;
+ case GC_DS_PER_OBJECT:
+ if ((signed_word)descr >= 0) {
+ descr = *(word *)((ptr_t)base + (descr & ~GC_DS_TAGS));
+ } else {
+ ptr_t type_descr = *(ptr_t *)base;
+ descr = *(word *)(type_descr
+ - (descr - (GC_DS_PER_OBJECT
+ - GC_INDIR_PER_OBJ_BIAS)));
+ }
+ goto retry;
+ }
+ return(p);
+ }
# endif
fail:
(*GC_is_visible_print_proc)((ptr_t)p);
return(p);
}
-
GC_API void * GC_CALL GC_pre_incr (void **p, ptrdiff_t how_much)
{
void * initial = *p;
void * result = GC_same_obj((void *)((ptr_t)initial + how_much), initial);
-
+
if (!GC_all_interior_pointers) {
- (void) GC_is_valid_displacement(result);
+ (void) GC_is_valid_displacement(result);
}
return (*p = result);
}
{
void * initial = *p;
void * result = GC_same_obj((void *)((ptr_t)initial + how_much), initial);
-
+
if (!GC_all_interior_pointers) {
- (void) GC_is_valid_displacement(result);
+ (void) GC_is_valid_displacement(result);
}
*p = result;
return(initial);
projects / cacao.git / blobdiff