/* "Bag-of-pages" garbage collector for the GNU compiler.
- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
+ Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "ggc.h"
#include "timevar.h"
#include "params.h"
-#ifdef ENABLE_VALGRIND_CHECKING
-# ifdef HAVE_VALGRIND_MEMCHECK_H
-# include <valgrind/memcheck.h>
-# elif defined HAVE_MEMCHECK_H
-# include <memcheck.h>
-# else
-# include <valgrind.h>
-# endif
-#else
-/* Avoid #ifdef:s when we can help it. */
-#define VALGRIND_DISCARD(x)
-#endif
+#include "tree-flow.h"
+#include "cfgloop.h"
+#include "plugin.h"
/* Prefer MAP_ANON(YMOUS) to /dev/zero, since we don't need to keep a
file open. Prefer either to valloc. */
#define USING_MALLOC_PAGE_GROUPS
#endif
-/* Stategy:
+/* Strategy:
This garbage-collecting allocator allocates objects on one of a set
of pages. Each page can allocate objects of a single size only;
#define OFFSET_TO_BIT(OFFSET, ORDER) \
(((OFFSET) * DIV_MULT (ORDER)) >> DIV_SHIFT (ORDER))
+/* We use this structure to determine the alignment required for
+ allocations. For power-of-two sized allocations, that's not a
+ problem, but it does matter for odd-sized allocations.
+ We do not care about alignment for floating-point types. */
+
+struct max_alignment {
+ char c;
+ union {
+ HOST_WIDEST_INT i;
+ void *p;
+ } u;
+};
+
+/* The biggest alignment required. */
+
+#define MAX_ALIGNMENT (offsetof (struct max_alignment, u))
+
+
/* The number of extra orders, not corresponding to power-of-two sized
objects. */
thing you need to do to add a new special allocation size. */
static const size_t extra_order_size_table[] = {
- sizeof (struct tree_decl),
- sizeof (struct tree_list),
- TREE_EXP_SIZE (2),
- RTL_SIZE (2), /* MEM, PLUS, etc. */
- RTL_SIZE (9), /* INSN */
+ /* Extra orders for small non-power-of-two multiples of MAX_ALIGNMENT.
+ There are a lot of structures with these sizes and explicitly
+ listing them risks orders being dropped because they changed size. */
+ MAX_ALIGNMENT * 3,
+ MAX_ALIGNMENT * 5,
+ MAX_ALIGNMENT * 6,
+ MAX_ALIGNMENT * 7,
+ MAX_ALIGNMENT * 9,
+ MAX_ALIGNMENT * 10,
+ MAX_ALIGNMENT * 11,
+ MAX_ALIGNMENT * 12,
+ MAX_ALIGNMENT * 13,
+ MAX_ALIGNMENT * 14,
+ MAX_ALIGNMENT * 15,
+ sizeof (struct tree_decl_non_common),
+ sizeof (struct tree_field_decl),
+ sizeof (struct tree_parm_decl),
+ sizeof (struct tree_var_decl),
+ sizeof (struct tree_type),
+ sizeof (struct function),
+ sizeof (struct basic_block_def),
+ sizeof (struct cgraph_node),
+ sizeof (struct loop),
};
/* The total number of orders. */
#define NUM_ORDERS (HOST_BITS_PER_PTR + NUM_EXTRA_ORDERS)
-/* We use this structure to determine the alignment required for
- allocations. For power-of-two sized allocations, that's not a
- problem, but it does matter for odd-sized allocations. */
-
-struct max_alignment {
- char c;
- union {
- HOST_WIDEST_INT i;
- long double d;
- } u;
-};
-
-/* The biggest alignment required. */
-
-#define MAX_ALIGNMENT (offsetof (struct max_alignment, u))
-
/* Compute the smallest nonnegative number which when added to X gives
a multiple of F. */
/* The previous page-entry with objects of the same size, or NULL if
this is the first page-entry. The PREV pointer exists solely to
- keep the cost of ggc_free managable. */
+ keep the cost of ggc_free manageable. */
struct page_entry *prev;
/* The number of bytes allocated. (This will always be a multiple
#endif
+#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;
+};
+#endif
+
/* The rest of the global variables. */
static struct globals
{
/* Maximum number of elements that can be used before resizing. */
unsigned int depth_max;
- /* Each element of this arry is an index in by_depth where the given
+ /* Each element of this array is an index in by_depth where the given
depth starts. This structure is indexed by that given depth we
are interested in. */
unsigned int *depth;
#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;
+ struct free_object *free_object_list;
#endif
#ifdef GATHER_STATISTICS
/* Total allocations and overhead for sizes less than 32, 64 and 128.
These sizes are interesting because they are typical cache line
sizes. */
-
+
unsigned long long total_allocated_under32;
unsigned long long total_overhead_under32;
-
+
unsigned long long total_allocated_under64;
unsigned long long total_overhead_under64;
-
+
unsigned long long total_allocated_under128;
unsigned long long total_overhead_under128;
-
+
/* The allocations for each of the allocation orders. */
unsigned long long total_allocated_per_order[NUM_ORDERS];
/* Allocate pages in chunks of this size, to throttle calls to memory
allocation routines. The first page is used, the rest go onto the
free list. This cannot be larger than HOST_BITS_PER_INT for the
- in_use bitmask for page_group. */
-#define GGC_QUIRE_SIZE 16
+ in_use bitmask for page_group. Hosts that need a different value
+ can override this by defining GGC_QUIRE_SIZE explicitly. */
+#ifndef GGC_QUIRE_SIZE
+# ifdef USING_MMAP
+# define GGC_QUIRE_SIZE 256
+# else
+# define GGC_QUIRE_SIZE 16
+# endif
+#endif
/* Initial guess as to how many page table entries we might need. */
#define INITIAL_PTE_COUNT 128
void debug_print_page_list (int);
static void push_depth (unsigned int);
static void push_by_depth (page_entry *, unsigned long *);
-struct alloc_zone *rtl_zone = NULL;
-struct alloc_zone *tree_zone = NULL;
-struct alloc_zone *garbage_zone = NULL;
/* Push an entry onto G.depth. */
if (G.depth_in_use >= G.depth_max)
{
G.depth_max *= 2;
- G.depth = xrealloc (G.depth, G.depth_max * sizeof (unsigned int));
+ G.depth = XRESIZEVEC (unsigned int, G.depth, G.depth_max);
}
G.depth[G.depth_in_use++] = i;
}
if (G.by_depth_in_use >= G.by_depth_max)
{
G.by_depth_max *= 2;
- G.by_depth = xrealloc (G.by_depth,
- G.by_depth_max * sizeof (page_entry *));
- G.save_in_use = xrealloc (G.save_in_use,
- G.by_depth_max * sizeof (unsigned long *));
+ G.by_depth = XRESIZEVEC (page_entry *, G.by_depth, G.by_depth_max);
+ G.save_in_use = XRESIZEVEC (unsigned long *, G.save_in_use,
+ G.by_depth_max);
}
G.by_depth[G.by_depth_in_use] = p;
G.save_in_use[G.by_depth_in_use++] = s;
goto found;
/* Not found -- allocate a new table. */
- table = xcalloc (1, sizeof(*table));
+ table = XCNEW (struct page_table_chain);
table->next = G.lookup;
table->high_bits = high_bits;
G.lookup = table;
L2 = LOOKUP_L2 (p);
if (base[L1] == NULL)
- base[L1] = xcalloc (PAGE_L2_SIZE, sizeof (page_entry *));
+ base[L1] = XCNEWVEC (page_entry *, PAGE_L2_SIZE);
base[L1][L2] = entry;
}
/* Pretend we don't have access to the allocated pages. We'll enable
access to smaller pieces of the area in ggc_alloc. Discard the
handle to avoid handle leak. */
- VALGRIND_DISCARD (VALGRIND_MAKE_NOACCESS (page, size));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_NOACCESS (page, size));
return page;
}
memory order. */
for (i = GGC_QUIRE_SIZE - 1; i >= 1; i--)
{
- e = xcalloc (1, page_entry_size);
+ e = XCNEWVAR (struct page_entry, page_entry_size);
e->order = order;
e->bytes = G.pagesize;
e->page = page + (i << G.lg_pagesize);
alloc_size = GGC_QUIRE_SIZE * G.pagesize;
else
alloc_size = entry_size + G.pagesize - 1;
- allocation = xmalloc (alloc_size);
+ allocation = XNEWVEC (char, alloc_size);
page = (char *) (((size_t) allocation + G.pagesize - 1) & -G.pagesize);
head_slop = page - allocation;
enda -= G.pagesize;
tail_slop += G.pagesize;
}
- if (tail_slop < sizeof (page_group))
- abort ();
+ gcc_assert (tail_slop >= sizeof (page_group));
group = (page_group *)enda;
tail_slop -= sizeof (page_group);
}
struct page_entry *e, *f = G.free_pages;
for (a = enda - G.pagesize; a != page; a -= G.pagesize)
{
- e = xcalloc (1, page_entry_size);
+ e = XCNEWVAR (struct page_entry, page_entry_size);
e->order = order;
e->bytes = G.pagesize;
e->page = a;
#endif
if (entry == NULL)
- entry = xcalloc (1, page_entry_size);
+ entry = XCNEWVAR (struct page_entry, page_entry_size);
entry->bytes = entry_size;
entry->page = page;
/* Mark the page as inaccessible. Discard the handle to avoid handle
leak. */
- VALGRIND_DISCARD (VALGRIND_MAKE_NOACCESS (entry->page, entry->bytes));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_NOACCESS (entry->page, entry->bytes));
set_page_table_entry (entry->page, NULL);
if (G.by_depth_in_use > 1)
{
page_entry *top = G.by_depth[G.by_depth_in_use-1];
+ int i = entry->index_by_depth;
- /* If they are at the same depth, put top element into freed
- slot. */
- if (entry->context_depth == top->context_depth)
- {
- int i = entry->index_by_depth;
- G.by_depth[i] = top;
- G.save_in_use[i] = G.save_in_use[G.by_depth_in_use-1];
- top->index_by_depth = i;
- }
- else
- {
- /* We cannot free a page from a context deeper than the
- current one. */
- abort ();
- }
+ /* We cannot free a page from a context deeper than the current
+ one. */
+ gcc_assert (entry->context_depth == top->context_depth);
+
+ /* Put top element into freed slot. */
+ G.by_depth[i] = top;
+ G.save_in_use[i] = G.save_in_use[G.by_depth_in_use-1];
+ top->index_by_depth = i;
}
--G.by_depth_in_use;
/* This table provides a fast way to determine ceil(log_2(size)) for
allocation requests. The minimum allocation size is eight bytes. */
-
-static unsigned char size_lookup[257] =
+#define NUM_SIZE_LOOKUP 512
+static unsigned char size_lookup[NUM_SIZE_LOOKUP] =
{
3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4,
4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
- 8
+ 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9
};
/* Typed allocation function. Does nothing special in this collector. */
return ggc_alloc_stat (size PASS_MEM_STAT);
}
-/* Zone allocation function. Does nothing special in this collector. */
-
-void *
-ggc_alloc_zone_stat (size_t size, struct alloc_zone *zone ATTRIBUTE_UNUSED
- MEM_STAT_DECL)
-{
- return ggc_alloc_stat (size PASS_MEM_STAT);
-}
-
/* Allocate a chunk of memory of SIZE bytes. Its contents are undefined. */
void *
struct page_entry *entry;
void *result;
- if (size <= 256)
+ if (size < NUM_SIZE_LOOKUP)
{
order = size_lookup[size];
object_size = OBJECT_SIZE (order);
}
else
{
- order = 9;
+ order = 10;
while (size > (object_size = OBJECT_SIZE (order)))
order++;
}
word = bit = 0;
while (~entry->in_use_p[word] == 0)
++word;
+
+#if GCC_VERSION >= 3004
+ bit = __builtin_ctzl (~entry->in_use_p[word]);
+#else
while ((entry->in_use_p[word] >> bit) & 1)
++bit;
+#endif
+
hint = word * HOST_BITS_PER_LONG + bit;
}
G.page_tails[order]->next = entry;
G.page_tails[order] = entry;
}
-#ifdef GATHER_STATISTICS
- ggc_record_overhead (OBJECT_SIZE (order), OBJECT_SIZE (order) - size PASS_MEM_STAT);
-#endif
/* Calculate the object's address. */
result = entry->page + object_offset;
+#ifdef GATHER_STATISTICS
+ ggc_record_overhead (OBJECT_SIZE (order), OBJECT_SIZE (order) - size,
+ result PASS_MEM_STAT);
+#endif
#ifdef ENABLE_GC_CHECKING
/* Keep poisoning-by-writing-0xaf the object, in an attempt to keep the
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));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_UNDEFINED (result, object_size));
/* `Poison' the entire allocated object, including any padding at
the end. */
/* 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 - size));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_NOACCESS ((char *) result + size,
+ object_size - size));
#endif
/* Tell Valgrind that the memory is there, but its content isn't
defined. The bytes at the end of the object are still marked
unaccessible. */
- VALGRIND_DISCARD (VALGRIND_MAKE_WRITABLE (result, size));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_UNDEFINED (result, size));
/* Keep track of how many bytes are being allocated. This
information is used in deciding when to collect. */
G.allocated += object_size;
+ /* For timevar statistics. */
+ timevar_ggc_mem_total += object_size;
+
#ifdef GATHER_STATISTICS
{
size_t overhead = object_size - size;
return result;
}
+/* Mark function for strings. */
+
+void
+gt_ggc_m_S (const void *p)
+{
+ page_entry *entry;
+ unsigned bit, word;
+ unsigned long mask;
+ unsigned long offset;
+
+ if (!p || !ggc_allocated_p (p))
+ return;
+
+ /* Look up the page on which the object is alloced. . */
+ entry = lookup_page_table_entry (p);
+ gcc_assert (entry);
+
+ /* Calculate the index of the object on the page; this is its bit
+ position in the in_use_p bitmap. Note that because a char* might
+ point to the middle of an object, we need special code here to
+ make sure P points to the start of an object. */
+ offset = ((const char *) p - entry->page) % object_size_table[entry->order];
+ if (offset)
+ {
+ /* Here we've seen a char* which does not point to the beginning
+ of an allocated object. We assume it points to the middle of
+ a STRING_CST. */
+ gcc_assert (offset == offsetof (struct tree_string, str));
+ p = ((const char *) p) - offset;
+ gt_ggc_mx_lang_tree_node (CONST_CAST (void *, p));
+ return;
+ }
+
+ bit = OFFSET_TO_BIT (((const char *) p) - entry->page, entry->order);
+ word = bit / HOST_BITS_PER_LONG;
+ mask = (unsigned long) 1 << (bit % HOST_BITS_PER_LONG);
+
+ /* If the bit was previously set, skip it. */
+ if (entry->in_use_p[word] & mask)
+ return;
+
+ /* Otherwise set it, and decrement the free object count. */
+ entry->in_use_p[word] |= mask;
+ entry->num_free_objects -= 1;
+
+ if (GGC_DEBUG_LEVEL >= 4)
+ fprintf (G.debug_file, "Marking %p\n", p);
+
+ return;
+}
+
/* If P is not marked, marks it and return false. Otherwise return true.
P must have been allocated by the GC allocator; it mustn't point to
static objects, stack variables, or memory allocated with malloc. */
/* Look up the page on which the object is alloced. If the object
wasn't allocated by the collector, we'll probably die. */
entry = lookup_page_table_entry (p);
-#ifdef ENABLE_CHECKING
- if (entry == NULL)
- abort ();
-#endif
+ gcc_assert (entry);
/* Calculate the index of the object on the page; this is its bit
position in the in_use_p bitmap. */
/* Look up the page on which the object is alloced. If the object
wasn't allocated by the collector, we'll probably die. */
entry = lookup_page_table_entry (p);
-#ifdef ENABLE_CHECKING
- if (entry == NULL)
- abort ();
-#endif
+ gcc_assert (entry);
/* Calculate the index of the object on the page; this is its bit
position in the in_use_p bitmap. */
size_t order = pe->order;
size_t size = OBJECT_SIZE (order);
+#ifdef GATHER_STATISTICS
+ ggc_free_overhead (p);
+#endif
+
if (GGC_DEBUG_LEVEL >= 3)
fprintf (G.debug_file,
"Freeing object, actual size=%lu, at %p on %p\n",
#ifdef ENABLE_GC_CHECKING
/* Poison the data, to indicate the data is garbage. */
- VALGRIND_DISCARD (VALGRIND_MAKE_WRITABLE (p, size));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_UNDEFINED (p, size));
memset (p, 0xa5, size);
#endif
/* Let valgrind know the object is free. */
- VALGRIND_DISCARD (VALGRIND_MAKE_NOACCESS (p, size));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_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
+ 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));
+ struct free_object *fo = XNEW (struct free_object);
fo->object = p;
fo->next = G.free_object_list;
G.free_object_list = fo;
/* 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 to the head of the list.
PE is the node we want to move. Q is the previous node
and P is the next node in the list. */
static void
compute_inverse (unsigned order)
{
- size_t size, inv;
+ size_t size, inv;
unsigned int e;
size = OBJECT_SIZE (order);
can't get something useful, give up. */
p = alloc_anon (NULL, G.pagesize);
- if ((size_t)p & (G.pagesize - 1))
- abort ();
+ gcc_assert (!((size_t)p & (G.pagesize - 1)));
}
/* We have a good page, might as well hold onto it... */
- e = xcalloc (1, sizeof (struct page_entry));
+ e = XCNEW (struct page_entry);
e->bytes = G.pagesize;
e->page = p;
e->next = G.free_pages;
int o;
int i;
- o = size_lookup[OBJECT_SIZE (order)];
- for (i = OBJECT_SIZE (order); size_lookup [i] == o; --i)
+ i = OBJECT_SIZE (order);
+ if (i >= NUM_SIZE_LOOKUP)
+ continue;
+
+ for (o = size_lookup[i]; o == size_lookup [i]; --i)
size_lookup[i] = order;
}
G.depth_in_use = 0;
G.depth_max = 10;
- G.depth = xmalloc (G.depth_max * sizeof (unsigned int));
+ G.depth = XNEWVEC (unsigned int, G.depth_max);
G.by_depth_in_use = 0;
G.by_depth_max = INITIAL_PTE_COUNT;
- G.by_depth = xmalloc (G.by_depth_max * sizeof (page_entry *));
- G.save_in_use = xmalloc (G.by_depth_max * sizeof (unsigned long *));
+ G.by_depth = XNEWVEC (page_entry *, G.by_depth_max);
+ G.save_in_use = XNEWVEC (unsigned long *, G.by_depth_max);
}
/* Start a new GGC zone. */
{
}
-/* Increment the `GC context'. Objects allocated in an outer context
- are never freed, eliminating the need to register their roots. */
-
-void
-ggc_push_context (void)
-{
- ++G.context_depth;
-
- /* Die on wrap. */
- if (G.context_depth >= HOST_BITS_PER_LONG)
- abort ();
-}
-
/* Merge the SAVE_IN_USE_P and IN_USE_P arrays in P so that IN_USE_P
reflects reality. Recalculate NUM_FREE_OBJECTS as well. */
p->num_free_objects -= (j & 1);
}
- if (p->num_free_objects >= num_objects)
- abort ();
-}
-
-/* Decrement the `GC context'. All objects allocated since the
- previous ggc_push_context are migrated to the outer context. */
-
-void
-ggc_pop_context (void)
-{
- unsigned long omask;
- unsigned int depth, i, e;
-#ifdef ENABLE_CHECKING
- unsigned int order;
-#endif
-
- depth = --G.context_depth;
- omask = (unsigned long)1 << (depth + 1);
-
- if (!((G.context_depth_allocations | G.context_depth_collections) & omask))
- return;
-
- G.context_depth_allocations |= (G.context_depth_allocations & omask) >> 1;
- G.context_depth_allocations &= omask - 1;
- G.context_depth_collections &= omask - 1;
-
- /* The G.depth array is shortened so that the last index is the
- context_depth of the top element of by_depth. */
- if (depth+1 < G.depth_in_use)
- e = G.depth[depth+1];
- else
- e = G.by_depth_in_use;
-
- /* We might not have any PTEs of depth depth. */
- if (depth < G.depth_in_use)
- {
-
- /* First we go through all the pages at depth depth to
- recalculate the in use bits. */
- for (i = G.depth[depth]; i < e; ++i)
- {
- page_entry *p;
-
-#ifdef ENABLE_CHECKING
- p = G.by_depth[i];
-
- /* Check that all of the pages really are at the depth that
- we expect. */
- if (p->context_depth != depth)
- abort ();
- if (p->index_by_depth != i)
- abort ();
-#endif
-
- prefetch (&save_in_use_p_i (i+8));
- prefetch (&save_in_use_p_i (i+16));
- if (save_in_use_p_i (i))
- {
- p = G.by_depth[i];
- ggc_recalculate_in_use_p (p);
- free (save_in_use_p_i (i));
- save_in_use_p_i (i) = 0;
- }
- }
- }
-
- /* Then, we reset all page_entries with a depth greater than depth
- to be at depth. */
- for (i = e; i < G.by_depth_in_use; ++i)
- {
- page_entry *p = G.by_depth[i];
-
- /* Check that all of the pages really are at the depth we
- expect. */
-#ifdef ENABLE_CHECKING
- if (p->context_depth <= depth)
- abort ();
- if (p->index_by_depth != i)
- abort ();
-#endif
- p->context_depth = depth;
- }
-
- adjust_depth ();
-
-#ifdef ENABLE_CHECKING
- for (order = 2; order < NUM_ORDERS; order++)
- {
- page_entry *p;
-
- for (p = G.pages[order]; p != NULL; p = p->next)
- {
- if (p->context_depth > depth)
- abort ();
- else if (p->context_depth == depth && save_in_use_p (p))
- abort ();
- }
- }
-#endif
+ gcc_assert (p->num_free_objects < num_objects);
}
\f
/* Unmark all objects. */
size_t num_objects = OBJECTS_IN_PAGE (p);
size_t bitmap_size = BITMAP_SIZE (num_objects + 1);
-#ifdef ENABLE_CHECKING
/* The data should be page-aligned. */
- if ((size_t) p->page & (G.pagesize - 1))
- abort ();
-#endif
+ gcc_assert (!((size_t) p->page & (G.pagesize - 1)));
/* Pages that aren't in the topmost context are not collected;
nevertheless, we need their in-use bit vectors to store GC
if (p->context_depth < G.context_depth)
{
if (! save_in_use_p (p))
- save_in_use_p (p) = xmalloc (bitmap_size);
+ save_in_use_p (p) = XNEWVAR (unsigned long, bitmap_size);
memcpy (save_in_use_p (p), p->in_use_p, bitmap_size);
}
G.pages[order] = next;
else
previous->next = next;
-
+
/* Splice P out of the back pointers too. */
if (next)
next->prev = previous;
so the exact same memory semantics is kept, in case
there are memory errors. We override this request
below. */
- VALGRIND_DISCARD (VALGRIND_MAKE_WRITABLE (object, size));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_UNDEFINED (object,
+ size));
memset (object, 0xa5, size);
/* Drop the handle to avoid handle leak. */
- VALGRIND_DISCARD (VALGRIND_MAKE_NOACCESS (object, size));
+ VALGRIND_DISCARD (VALGRIND_MAKE_MEM_NOACCESS (object, size));
}
}
}
/* 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 ();
+ gcc_assert (!(pe->in_use_p[word] & (1UL << bit)));
/* If the object comes from an outer context, then retain the
free_object entry, so that we can verify that the address
float min_expand = allocated_last_gc * PARAM_VALUE (GGC_MIN_EXPAND) / 100;
- if (G.allocated < allocated_last_gc + min_expand)
+ if (G.allocated < allocated_last_gc + min_expand && !ggc_force_collect)
return;
timevar_push (TV_GC);
/* Indicate that we've seen collections at this context depth. */
G.context_depth_collections = ((unsigned long)1 << (G.context_depth + 1)) - 1;
+ invoke_plugin_callbacks (PLUGIN_GGC_START, NULL);
+
clear_marks ();
ggc_mark_roots ();
+#ifdef GATHER_STATISTICS
+ ggc_prune_overhead_list ();
+#endif
poison_pages ();
validate_free_objects ();
sweep_pages ();
G.allocated_last_gc = G.allocated;
+ invoke_plugin_callbacks (PLUGIN_GGC_END, NULL);
+
timevar_pop (TV_GC);
if (!quiet_flag)
: ((x) < 1024*1024*10 \
? (x) / 1024 \
: (x) / (1024*1024))))
-#define LABEL(x) ((x) < 1024*10 ? ' ' : ((x) < 1024*1024*10 ? 'k' : 'M'))
+#define STAT_LABEL(x) ((x) < 1024*10 ? ' ' : ((x) < 1024*1024*10 ? 'k' : 'M'))
void
ggc_print_statistics (void)
}
fprintf (stderr, "%-5lu %10lu%c %10lu%c %10lu%c\n",
(unsigned long) OBJECT_SIZE (i),
- SCALE (allocated), LABEL (allocated),
- SCALE (in_use), LABEL (in_use),
- SCALE (overhead), LABEL (overhead));
+ SCALE (allocated), STAT_LABEL (allocated),
+ SCALE (in_use), STAT_LABEL (in_use),
+ SCALE (overhead), STAT_LABEL (overhead));
total_overhead += overhead;
}
fprintf (stderr, "%-5s %10lu%c %10lu%c %10lu%c\n", "Total",
- SCALE (G.bytes_mapped), LABEL (G.bytes_mapped),
- SCALE (G.allocated), LABEL(G.allocated),
- SCALE (total_overhead), LABEL (total_overhead));
+ SCALE (G.bytes_mapped), STAT_LABEL (G.bytes_mapped),
+ SCALE (G.allocated), STAT_LABEL(G.allocated),
+ SCALE (total_overhead), STAT_LABEL (total_overhead));
-#ifdef GATHER_STATISTICS
+#ifdef GATHER_STATISTICS
{
fprintf (stderr, "\nTotal allocations and overheads during the compilation process\n");
G.stats.total_overhead_under128);
fprintf (stderr, "Total Allocated under 128B: %10lld\n",
G.stats.total_allocated_under128);
-
+
for (i = 0; i < NUM_ORDERS; i++)
if (G.stats.total_allocated_per_order[i])
{
- fprintf (stderr, "Total Overhead page size %7d: %10lld\n",
- OBJECT_SIZE (i), G.stats.total_overhead_per_order[i]);
- fprintf (stderr, "Total Allocated page size %7d: %10lld\n",
- OBJECT_SIZE (i), G.stats.total_allocated_per_order[i]);
+ fprintf (stderr, "Total Overhead page size %7lu: %10lld\n",
+ (unsigned long) OBJECT_SIZE (i),
+ G.stats.total_overhead_per_order[i]);
+ fprintf (stderr, "Total Allocated page size %7lu: %10lld\n",
+ (unsigned long) OBJECT_SIZE (i),
+ G.stats.total_allocated_per_order[i]);
}
}
#endif
}
\f
+struct ggc_pch_ondisk
+{
+ unsigned totals[NUM_ORDERS];
+};
+
struct ggc_pch_data
{
- struct ggc_pch_ondisk
- {
- unsigned totals[NUM_ORDERS];
- } d;
+ struct ggc_pch_ondisk d;
size_t base[NUM_ORDERS];
size_t written[NUM_ORDERS];
};
struct ggc_pch_data *
init_ggc_pch (void)
{
- return xcalloc (sizeof (struct ggc_pch_data), 1);
+ return XCNEW (struct ggc_pch_data);
}
void
ggc_pch_count_object (struct ggc_pch_data *d, void *x ATTRIBUTE_UNUSED,
- size_t size, bool is_string ATTRIBUTE_UNUSED)
+ size_t size, bool is_string ATTRIBUTE_UNUSED,
+ enum gt_types_enum type ATTRIBUTE_UNUSED)
{
unsigned order;
- if (size <= 256)
+ if (size < NUM_SIZE_LOOKUP)
order = size_lookup[size];
else
{
- order = 9;
+ order = 10;
while (size > OBJECT_SIZE (order))
order++;
}
char *
ggc_pch_alloc_object (struct ggc_pch_data *d, void *x ATTRIBUTE_UNUSED,
- size_t size, bool is_string ATTRIBUTE_UNUSED)
+ size_t size, bool is_string ATTRIBUTE_UNUSED,
+ enum gt_types_enum type ATTRIBUTE_UNUSED)
{
unsigned order;
char *result;
- if (size <= 256)
+ if (size < NUM_SIZE_LOOKUP)
order = size_lookup[size];
else
{
- order = 9;
+ order = 10;
while (size > OBJECT_SIZE (order))
order++;
}
size_t size, bool is_string ATTRIBUTE_UNUSED)
{
unsigned order;
- static const char emptyBytes[256];
+ static const char emptyBytes[256] = { 0 };
- if (size <= 256)
+ if (size < NUM_SIZE_LOOKUP)
order = size_lookup[size];
else
{
- order = 9;
+ order = 10;
while (size > OBJECT_SIZE (order))
order++;
}
/* To speed small writes, we use a nulled-out array that's larger
than most padding requests as the source for our null bytes. This
permits us to do the padding with fwrite() rather than fseek(), and
- limits the chance the the OS may try to flush any outstanding
- writes. */
+ limits the chance the OS may try to flush any outstanding writes. */
if (padding <= sizeof(emptyBytes))
{
if (fwrite (emptyBytes, 1, padding, f) != padding)
page_entry **new_by_depth;
unsigned long **new_save_in_use;
- new_by_depth = xmalloc (G.by_depth_max * sizeof (page_entry *));
- new_save_in_use = xmalloc (G.by_depth_max * sizeof (unsigned long *));
+ new_by_depth = XNEWVEC (page_entry *, G.by_depth_max);
+ new_save_in_use = XNEWVEC (unsigned long *, G.by_depth_max);
memcpy (&new_by_depth[0],
&G.by_depth[count_old_page_tables],
{
struct ggc_pch_ondisk d;
unsigned i;
- char *offs = addr;
+ char *offs = (char *) addr;
unsigned long count_old_page_tables;
unsigned long count_new_page_tables;
#ifdef ENABLE_GC_CHECKING
poison_pages ();
#endif
+ /* Since we free all the allocated objects, the free list becomes
+ useless. Validate it now, which will also clear it. */
+ validate_free_objects();
/* No object read from a PCH file should ever be freed. So, set the
context depth to 1, and set the depth of all the currently-allocated
pages to be 1 too. PCH pages will have depth 0. */
- if (G.context_depth != 0)
- abort ();
+ gcc_assert (!G.context_depth);
G.context_depth = 1;
for (i = 0; i < NUM_ORDERS; i++)
{
bytes = ROUND_UP (d.totals[i] * OBJECT_SIZE (i), G.pagesize);
num_objs = bytes / OBJECT_SIZE (i);
- entry = xcalloc (1, (sizeof (struct page_entry)
- - sizeof (long)
- + BITMAP_SIZE (num_objs + 1)));
+ entry = XCNEWVAR (struct page_entry, (sizeof (struct page_entry)
+ - sizeof (long)
+ + BITMAP_SIZE (num_objs + 1)));
entry->bytes = bytes;
entry->page = offs;
entry->context_depth = 0;
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