/* Simple garbage collection for the GNU compiler.
- Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
+ Free Software Foundation, Inc.
This file is part of GCC.
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "rtl.h"
#include "tree.h"
#include "tm_p.h"
#include "flags.h"
#include "varray.h"
#include "ggc.h"
+#include "toplev.h"
#include "timevar.h"
+#include "params.h"
/* Debugging flags. */
/* Zap memory before freeing to catch dangling pointers. */
-#define GGC_POISON
+#undef GGC_POISON
/* Collect statistics on how bushy the search tree is. */
#undef GGC_BALANCE
-/* Perform collection every time ggc_collect is invoked. Otherwise,
- collection is performed only when a significant amount of memory
- has been allocated since the last collection. */
-#undef GGC_ALWAYS_COLLECT
-
/* Always verify that the to-be-marked memory is collectable. */
#undef GGC_ALWAYS_VERIFY
#define GGC_POISON
#define GGC_ALWAYS_VERIFY
#endif
-#ifdef ENABLE_GC_ALWAYS_COLLECT
-#define GGC_ALWAYS_COLLECT
-#endif
#ifndef HOST_BITS_PER_PTR
#define HOST_BITS_PER_PTR HOST_BITS_PER_LONG
/* Make sure the data is reasonably aligned. */
union {
HOST_WIDEST_INT i;
-#ifdef HAVE_LONG_DOUBLE
long double d;
-#else
- double d;
-#endif
} u;
};
int context;
} G;
-/* Skip garbage collection if the current allocation is not at least
- this factor times the allocation at the end of the last collection.
- In other words, total allocation must expand by (this factor minus
- one) before collection is performed. */
-#define GGC_MIN_EXPAND_FOR_GC (1.3)
-
-/* Bound `allocated_last_gc' to 4MB, to prevent the memory expansion
- test from triggering too often when the heap is small. */
-#define GGC_MIN_LAST_ALLOCATED (4 * 1024 * 1024)
-
/* Local function prototypes. */
-static void tree_insert PARAMS ((struct ggc_mem *));
-static int tree_lookup PARAMS ((struct ggc_mem *));
-static void clear_marks PARAMS ((struct ggc_mem *));
-static void sweep_objs PARAMS ((struct ggc_mem **));
-static void ggc_pop_context_1 PARAMS ((struct ggc_mem *, int));
+static void tree_insert (struct ggc_mem *);
+static int tree_lookup (struct ggc_mem *);
+static void clear_marks (struct ggc_mem *);
+static void sweep_objs (struct ggc_mem **);
+static void ggc_pop_context_1 (struct ggc_mem *, int);
/* For use from debugger. */
-extern void debug_ggc_tree PARAMS ((struct ggc_mem *, int));
+extern void debug_ggc_tree (struct ggc_mem *, int);
#ifdef GGC_BALANCE
-extern void debug_ggc_balance PARAMS ((void));
+extern void debug_ggc_balance (void);
#endif
-static void tally_leaves PARAMS ((struct ggc_mem *, int, size_t *, size_t *));
+static void tally_leaves (struct ggc_mem *, int, size_t *, size_t *);
/* Insert V into the search tree. */
static inline void
-tree_insert (v)
- struct ggc_mem *v;
+tree_insert (struct ggc_mem *v)
{
size_t v_key = PTR_KEY (v);
struct ggc_mem *p, **pp;
/* Return true if V is in the tree. */
static inline int
-tree_lookup (v)
- struct ggc_mem *v;
+tree_lookup (struct ggc_mem *v)
{
size_t v_key = PTR_KEY (v);
struct ggc_mem *p = G.root;
/* Alloc SIZE bytes of GC'able memory. If ZERO, clear the memory. */
void *
-ggc_alloc (size)
- size_t size;
+ggc_alloc (size_t size)
{
struct ggc_mem *x;
- x = (struct ggc_mem *) xmalloc (offsetof (struct ggc_mem, u) + size);
+ x = xmalloc (offsetof (struct ggc_mem, u) + size);
x->sub[0] = NULL;
x->sub[1] = NULL;
x->mark = 0;
/* Mark a node. */
int
-ggc_set_mark (p)
- const void *p;
+ggc_set_mark (const void *p)
{
struct ggc_mem *x;
/* Return 1 if P has been marked, zero otherwise. */
int
-ggc_marked_p (p)
- const void *p;
+ggc_marked_p (const void *p)
{
struct ggc_mem *x;
/* Return the size of the gc-able object P. */
size_t
-ggc_get_size (p)
- const void *p;
+ggc_get_size (const void *p)
{
struct ggc_mem *x
= (struct ggc_mem *) ((const char *)p - offsetof (struct ggc_mem, u));
/* Unmark all objects. */
static void
-clear_marks (x)
- struct ggc_mem *x;
+clear_marks (struct ggc_mem *x)
{
x->mark = 0;
if (x->sub[0])
/* Free all objects in the current context that are not marked. */
static void
-sweep_objs (root)
- struct ggc_mem **root;
+sweep_objs (struct ggc_mem **root)
{
struct ggc_mem *x = *root;
if (!x)
/* The top level mark-and-sweep routine. */
void
-ggc_collect ()
+ggc_collect (void)
{
-#ifndef GGC_ALWAYS_COLLECT
- if (G.allocated < GGC_MIN_EXPAND_FOR_GC * G.allocated_last_gc)
+ /* Avoid frequent unnecessary work by skipping collection if the
+ total allocations haven't expanded much since the last
+ collection. */
+ size_t allocated_last_gc =
+ MAX (G.allocated_last_gc, (size_t)PARAM_VALUE (GGC_MIN_HEAPSIZE) * 1024);
+
+ size_t min_expand = allocated_last_gc * PARAM_VALUE (GGC_MIN_EXPAND) / 100;
+
+ if (G.allocated < allocated_last_gc + min_expand)
return;
-#endif
#ifdef GGC_BALANCE
debug_ggc_balance ();
sweep_objs (&G.root);
G.allocated_last_gc = G.allocated;
- if (G.allocated_last_gc < GGC_MIN_LAST_ALLOCATED)
- G.allocated_last_gc = GGC_MIN_LAST_ALLOCATED;
timevar_pop (TV_GC);
/* Called once to initialize the garbage collector. */
void
-init_ggc ()
+init_ggc (void)
+{
+}
+
+/* Start a new GGC zone. */
+
+struct alloc_zone *
+new_ggc_zone (const char *name ATTRIBUTE_UNUSED)
+{
+ return NULL;
+}
+
+/* Destroy a GGC zone. */
+void
+destroy_ggc_zone (struct alloc_zone *zone ATTRIBUTE_UNUSED)
{
- G.allocated_last_gc = GGC_MIN_LAST_ALLOCATED;
}
/* Start a new GGC context. Memory allocated in previous contexts
will not be collected while the new context is active. */
void
-ggc_push_context ()
+ggc_push_context (void)
{
G.context++;
will be merged with the old context. */
void
-ggc_pop_context ()
+ggc_pop_context (void)
{
G.context--;
if (G.root)
}
static void
-ggc_pop_context_1 (x, c)
- struct ggc_mem *x;
- int c;
+ggc_pop_context_1 (struct ggc_mem *x, int c)
{
if (x->context > c)
x->context = c;
/* Dump a tree. */
void
-debug_ggc_tree (p, indent)
- struct ggc_mem *p;
- int indent;
+debug_ggc_tree (struct ggc_mem *p, int indent)
{
int i;
for (i = 0; i < indent; ++i)
putc (' ', stderr);
- fprintf (stderr, "%lx %p\n", (unsigned long)PTR_KEY (p), p);
+ fprintf (stderr, "%lx %p\n", (unsigned long)PTR_KEY (p), (void *) p);
if (p->sub[1])
debug_ggc_tree (p->sub[1], indent + 1);
#include <math.h>
void
-debug_ggc_balance ()
+debug_ggc_balance (void)
{
size_t nleaf, sumdepth;
/* Used by debug_ggc_balance, and also by ggc_print_statistics. */
static void
-tally_leaves (x, depth, nleaf, sumdepth)
- struct ggc_mem *x;
- int depth;
- size_t *nleaf;
- size_t *sumdepth;
+tally_leaves (struct ggc_mem *x, int depth, size_t *nleaf, size_t *sumdepth)
{
if (! x->sub[0] && !x->sub[1])
{
/* Report on GC memory usage. */
void
-ggc_print_statistics ()
+ggc_print_statistics (void)
{
struct ggc_statistics stats;
size_t nleaf = 0, sumdepth = 0;
fprintf (stderr, "\n\
Total internal data (bytes)\t%ld%c\n\
-Number of leaves in tree\t%d\n\
+Number of leaves in tree\t%lu\n\
Average leaf depth\t\t%.1f\n",
SCALE(G.objects * offsetof (struct ggc_mem, u)),
LABEL(G.objects * offsetof (struct ggc_mem, u)),
- nleaf, (double)sumdepth / (double)nleaf);
+ (unsigned long)nleaf, (double)sumdepth / (double)nleaf);
/* Report overall memory usage. */
fprintf (stderr, "\n\
-Total objects allocated\t\t%d\n\
+Total objects allocated\t\t%ld\n\
Total memory in GC arena\t%ld%c\n",
- G.objects,
+ (unsigned long)G.objects,
SCALE(G.allocated), LABEL(G.allocated));
}
+\f
+struct ggc_pch_data *
+init_ggc_pch (void)
+{
+ sorry ("Generating PCH files is not supported when using ggc-simple.c");
+ /* It could be supported, but the code is not yet written. */
+ return NULL;
+}
+
+void
+ggc_pch_count_object (struct ggc_pch_data *d ATTRIBUTE_UNUSED,
+ void *x ATTRIBUTE_UNUSED,
+ size_t size ATTRIBUTE_UNUSED)
+{
+}
+
+size_t
+ggc_pch_total_size (struct ggc_pch_data *d ATTRIBUTE_UNUSED)
+{
+ return 0;
+}
+
+void
+ggc_pch_this_base (struct ggc_pch_data *d ATTRIBUTE_UNUSED,
+ void *base ATTRIBUTE_UNUSED)
+{
+}
+
+
+char *
+ggc_pch_alloc_object (struct ggc_pch_data *d ATTRIBUTE_UNUSED,
+ void *x ATTRIBUTE_UNUSED,
+ size_t size ATTRIBUTE_UNUSED)
+{
+ return NULL;
+}
+
+void
+ggc_pch_prepare_write (struct ggc_pch_data *d ATTRIBUTE_UNUSED,
+ FILE * f ATTRIBUTE_UNUSED)
+{
+}
+
+void
+ggc_pch_write_object (struct ggc_pch_data *d ATTRIBUTE_UNUSED,
+ FILE *f ATTRIBUTE_UNUSED, void *x ATTRIBUTE_UNUSED,
+ void *newx ATTRIBUTE_UNUSED,
+ size_t size ATTRIBUTE_UNUSED)
+{
+}
+
+void
+ggc_pch_finish (struct ggc_pch_data *d ATTRIBUTE_UNUSED,
+ FILE *f ATTRIBUTE_UNUSED)
+{
+}
+
+void
+ggc_pch_read (FILE *f ATTRIBUTE_UNUSED, void *addr ATTRIBUTE_UNUSED)
+{
+ /* This should be impossible, since we won't generate any valid PCH
+ files for this configuration. */
+ abort ();
+}
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