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ggc.h (ggc_free): Declare.

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* ggc.h (ggc_free): Declare.
        * ggc-common.c (ggc_realloc): Use it.
        * ggc-page.c: Remove lots of inline markers.
        (globals): Add free_object_list.
        (ggc_alloc): Tidy.
        (ggc_free, validate_free_objects): New.
        (poison_pages): Provide default.
        (ggc_collect): Call validate_free_objects; emit markers to
        the debug file.

From-SVN: r76801
This commit is contained in:
Richard Henderson 2004-01-28 10:49:26 -08:00 committed by Richard Henderson
parent 42e5a9b957
commit 685fe0325c
4 changed files with 184 additions and 41 deletions
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12
gcc/ChangeLog
View File

@ -1,3 +1,15 @@
2004-01-28 Richard Henderson <rth@redhat.com>
* ggc.h (ggc_free): Declare.
* ggc-common.c (ggc_realloc): Use it.
* ggc-page.c: Remove lots of inline markers.
(globals): Add free_object_list.
(ggc_alloc): Tidy.
(ggc_free, validate_free_objects): New.
(poison_pages): Provide default.
(ggc_collect): Call validate_free_objects; emit markers to
the debug file.
2004-01-28 Zack Weinberg <zack@codesourcery.com>
Jim Wilson <wilson@specifixinc.com>

3
gcc/ggc-common.c
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@ -147,6 +147,7 @@ ggc_realloc (void *x, size_t size)
return ggc_alloc (size);
old_size = ggc_get_size (x);
if (size <= old_size)
{
/* Mark the unwanted memory as unaccessible. We also need to make
@ -176,7 +177,7 @@ ggc_realloc (void *x, size_t size)
memcpy (r, x, old_size);
/* The old object is not supposed to be used anymore. */
VALGRIND_DISCARD (VALGRIND_MAKE_NOACCESS (x, old_size));
ggc_free (x);
return r;
}

208
gcc/ggc-page.c
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@ -401,6 +401,17 @@ static struct globals
zero otherwise. We allocate them all together, to enable a
better runtime data access pattern. */
unsigned long **save_in_use;
#ifdef ENABLE_GC_ALWAYS_COLLECT
/* List of free objects to be verified as actually free on the
next collection. */
struct free_object
{
void *object;
struct free_object *next;
} *free_object_list;
#endif
#ifdef GATHER_STATISTICS
struct
{
@ -466,10 +477,6 @@ static void compute_inverse (unsigned);
static inline void adjust_depth (void);
static void move_ptes_to_front (int, int);
#ifdef ENABLE_GC_CHECKING
static void poison_pages (void);
#endif
void debug_print_page_list (int);
static void push_depth (unsigned int);
static void push_by_depth (page_entry *, unsigned long *);
@ -894,7 +901,7 @@ adjust_depth (void)
/* For a page that is no longer needed, put it on the free page list. */
static inline void
static void
free_page (page_entry *entry)
{
if (GGC_DEBUG_LEVEL >= 2)
@ -1049,16 +1056,19 @@ ggc_alloc_zone (size_t size, struct alloc_zone *zone ATTRIBUTE_UNUSED)
void *
ggc_alloc (size_t size)
{
unsigned order, word, bit, object_offset;
size_t order, word, bit, object_offset, object_size;
struct page_entry *entry;
void *result;
if (size <= 256)
order = size_lookup[size];
{
order = size_lookup[size];
object_size = OBJECT_SIZE (order);
}
else
{
order = 9;
while (size > OBJECT_SIZE (order))
while (size > (object_size = OBJECT_SIZE (order)))
order++;
}
@ -1121,7 +1131,7 @@ ggc_alloc (size_t size)
/* Next time, try the next bit. */
entry->next_bit_hint = hint + 1;
object_offset = hint * OBJECT_SIZE (order);
object_offset = hint * object_size;
}
/* Set the in-use bit. */
@ -1149,16 +1159,16 @@ ggc_alloc (size_t size)
exact same semantics in presence of memory bugs, regardless of
ENABLE_VALGRIND_CHECKING. We override this request below. Drop the
handle to avoid handle leak. */
VALGRIND_DISCARD (VALGRIND_MAKE_WRITABLE (result, OBJECT_SIZE (order)));
VALGRIND_DISCARD (VALGRIND_MAKE_WRITABLE (result, object_size));
/* `Poison' the entire allocated object, including any padding at
the end. */
memset (result, 0xaf, OBJECT_SIZE (order));
memset (result, 0xaf, object_size);
/* Make the bytes after the end of the object unaccessible. Discard the
handle to avoid handle leak. */
VALGRIND_DISCARD (VALGRIND_MAKE_NOACCESS ((char *) result + size,
OBJECT_SIZE (order) - size));
object_size - size));
#endif
/* Tell Valgrind that the memory is there, but its content isn't
@ -1168,37 +1178,39 @@ ggc_alloc (size_t size)
/* Keep track of how many bytes are being allocated. This
information is used in deciding when to collect. */
G.allocated += OBJECT_SIZE (order);
G.allocated += object_size;
#ifdef GATHER_STATISTICS
{
G.stats.total_overhead += OBJECT_SIZE (order) - size;
G.stats.total_allocated += OBJECT_SIZE(order);
G.stats.total_overhead_per_order[order] += OBJECT_SIZE (order) - size;
G.stats.total_allocated_per_order[order] += OBJECT_SIZE (order);
size_t overhead = object_size - size;
if (size <= 32){
G.stats.total_overhead_under32 += OBJECT_SIZE (order) - size;
G.stats.total_allocated_under32 += OBJECT_SIZE(order);
}
if (size <= 64){
G.stats.total_overhead_under64 += OBJECT_SIZE (order) - size;
G.stats.total_allocated_under64 += OBJECT_SIZE(order);
}
if (size <= 128){
G.stats.total_overhead_under128 += OBJECT_SIZE (order) - size;
G.stats.total_allocated_under128 += OBJECT_SIZE(order);
}
G.stats.total_overhead += overhead;
G.stats.total_allocated += object_size;
G.stats.total_overhead_per_order[order] += overhead;
G.stats.total_allocated_per_order[order] += object_size;
if (size <= 32)
{
G.stats.total_overhead_under32 += overhead;
G.stats.total_allocated_under32 += object_size;
}
if (size <= 64)
{
G.stats.total_overhead_under64 += overhead;
G.stats.total_allocated_under64 += object_size;
}
if (size <= 128)
{
G.stats.total_overhead_under128 += overhead;
G.stats.total_allocated_under128 += object_size;
}
}
#endif
if (GGC_DEBUG_LEVEL >= 3)
fprintf (G.debug_file,
"Allocating object, requested size=%lu, actual=%lu at %p on %p\n",
(unsigned long) size, (unsigned long) OBJECT_SIZE (order), result,
(unsigned long) size, (unsigned long) object_size, result,
(void *) entry);
return result;
@ -1279,6 +1291,78 @@ ggc_get_size (const void *p)
page_entry *pe = lookup_page_table_entry (p);
return OBJECT_SIZE (pe->order);
}
/* Release the memory for object P. */
void
ggc_free (void *p)
{
page_entry *pe = lookup_page_table_entry (p);
size_t order = pe->order;
size_t size = OBJECT_SIZE (order);
if (GGC_DEBUG_LEVEL >= 3)
fprintf (G.debug_file,
"Freeing object, actual size=%lu, at %p on %p\n",
(unsigned long) size, p, (void *) pe);
#ifdef ENABLE_GC_CHECKING
/* Poison the data, to indicate the data is garbage. */
VALGRIND_DISCARD (VALGRIND_MAKE_WRITABLE (p, size));
memset (p, 0xa5, size);
#endif
/* Let valgrind know the object is free. */
VALGRIND_DISCARD (VALGRIND_MAKE_NOACCESS (p, size));
#ifdef ENABLE_GC_ALWAYS_COLLECT
/* In the completely-anal-checking mode, we do *not* immediately free
the data, but instead verify that the data is *actually* not
reachable the next time we collect. */
{
struct free_object *fo = xmalloc (sizeof (struct free_object));
fo->object = p;
fo->next = G.free_object_list;
G.free_object_list = fo;
}
#else
{
unsigned int bit_offset, word, bit;
G.allocated -= size;
/* Mark the object not-in-use. */
bit_offset = OFFSET_TO_BIT (((const char *) p) - pe->page, order);
word = bit_offset / HOST_BITS_PER_LONG;
bit = bit_offset % HOST_BITS_PER_LONG;
pe->in_use_p[word] &= ~(1UL << bit);
if (pe->num_free_objects++ == 0)
{
/* If the page is completely full, then it's supposed to
be after all pages that aren't. Since we've freed one
object from a page that was full, we need to move the
page to the head of the list. */
page_entry *p, *q;
for (q = NULL, p = G.pages[order]; ; q = p, p = p->next)
if (p == pe)
break;
if (q && q->num_free_objects == 0)
{
p = pe->next;
q->next = p;
if (!p)
G.page_tails[order] = q;
pe->next = G.pages[order];
G.pages[order] = pe;
}
/* Reset the hint bit to point to the only free object. */
pe->next_bit_hint = bit_offset;
}
}
#endif
}
/* Subroutine of init_ggc which computes the pair of numbers used to
perform division by OBJECT_SIZE (order) and fills in inverse_table[].
@ -1567,7 +1651,7 @@ ggc_pop_context (void)
/* Unmark all objects. */
static inline void
static void
clear_marks (void)
{
unsigned order;
@ -1612,7 +1696,7 @@ clear_marks (void)
/* Free all empty pages. Partially empty pages need no attention
because the `mark' bit doubles as an `unused' bit. */
static inline void
static void
sweep_pages (void)
{
unsigned order;
@ -1721,7 +1805,7 @@ sweep_pages (void)
#ifdef ENABLE_GC_CHECKING
/* Clobber all free objects. */
static inline void
static void
poison_pages (void)
{
unsigned order;
@ -1767,6 +1851,49 @@ poison_pages (void)
}
}
}
#else
#define poison_pages()
#endif
#ifdef ENABLE_GC_ALWAYS_COLLECT
/* Validate that the reportedly free objects actually are. */
static void
validate_free_objects (void)
{
struct free_object *f, *next, *still_free = NULL;
for (f = G.free_object_list; f ; f = next)
{
page_entry *pe = lookup_page_table_entry (f->object);
size_t bit, word;
bit = OFFSET_TO_BIT ((char *)f->object - pe->page, pe->order);
word = bit / HOST_BITS_PER_LONG;
bit = bit % HOST_BITS_PER_LONG;
next = f->next;
/* Make certain it isn't visible from any root. Notice that we
do this check before sweep_pages merges save_in_use_p. */
if (pe->in_use_p[word] & (1UL << bit))
abort ();
/* If the object comes from an outer context, then retain the
free_object entry, so that we can verify that the address
isn't live on the stack in some outer context. */
if (pe->context_depth != G.context_depth)
{
f->next = still_free;
still_free = f;
}
else
free (f);
}
G.free_object_list = still_free;
}
#else
#define validate_free_objects()
#endif
/* Top level mark-and-sweep routine. */
@ -1788,6 +1915,8 @@ ggc_collect (void)
timevar_push (TV_GC);
if (!quiet_flag)
fprintf (stderr, " {GC %luk -> ", (unsigned long) G.allocated / 1024);
if (GGC_DEBUG_LEVEL >= 2)
fprintf (G.debug_file, "BEGIN COLLECTING\n");
/* Zero the total allocated bytes. This will be recalculated in the
sweep phase. */
@ -1802,11 +1931,8 @@ ggc_collect (void)
clear_marks ();
ggc_mark_roots ();
#ifdef ENABLE_GC_CHECKING
poison_pages ();
#endif
validate_free_objects ();
sweep_pages ();
G.allocated_last_gc = G.allocated;
@ -1815,6 +1941,8 @@ ggc_collect (void)
if (!quiet_flag)
fprintf (stderr, "%luk}", (unsigned long) G.allocated / 1024);
if (GGC_DEBUG_LEVEL >= 2)
fprintf (G.debug_file, "END COLLECTING\n");
}
/* Print allocation statistics. */

2
gcc/ggc.h
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@ -223,6 +223,8 @@ extern void *ggc_alloc_cleared_zone (size_t, struct alloc_zone *);
extern void *ggc_realloc (void *, size_t);
/* Like ggc_alloc_cleared, but performs a multiplication. */
extern void *ggc_calloc (size_t, size_t);
/* Free a block. To be used when known for certain it's not reachable. */
extern void ggc_free (void *);
#define ggc_alloc_rtx(CODE) \
((rtx) ggc_alloc_typed (gt_ggc_e_7rtx_def, RTX_SIZE (CODE)))