/* Simple garbage collection for the GNU compiler.
- Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2001, 2002, 2003
+ Free Software Foundation, Inc.
This file is part of GCC.
#include "config.h"
#include "system.h"
-#include "rtl.h"
-#include "tree.h"
-#include "tm_p.h"
+#include "coretypes.h"
#include "hashtab.h"
-#include "varray.h"
#include "ggc.h"
-#include "langhooks.h"
+#include "toplev.h"
+#include "params.h"
+#include "hosthooks.h"
+
+#ifdef HAVE_SYS_RESOURCE_H
+# include <sys/resource.h>
+#endif
+
+#ifdef HAVE_MMAP_FILE
+# include <sys/mman.h>
+# ifdef HAVE_MINCORE
+/* This is on Solaris. */
+# include <sys/types.h>
+# endif
+#endif
+
+#ifndef MAP_FAILED
+# define MAP_FAILED ((void *)-1)
+#endif
+
#ifdef ENABLE_VALGRIND_CHECKING
-#include <valgrind.h>
+# ifdef HAVE_MEMCHECK_H
+# include <memcheck.h>
+# else
+# include <valgrind.h>
+# endif
#else
/* Avoid #ifdef:s when we can help it. */
#define VALGRIND_DISCARD(x)
/* Statistics about the allocation. */
static ggc_statistics *ggc_stats;
-static int ggc_htab_delete PARAMS ((void **, void *));
-
-/* Maintain global roots that are preserved during GC. */
-
-/* Global roots that are preserved during calls to gc. */
-
-struct ggc_root
-{
- struct ggc_root *next;
- void *base;
- int nelt;
- int size;
- void (*cb) PARAMS ((void *));
-};
-
-static struct ggc_root *roots;
-
-/* Add BASE as a new garbage collection root. It is an array of
- length NELT with each element SIZE bytes long. CB is a
- function that will be called with a pointer to each element
- of the array; it is the intention that CB call the appropriate
- routine to mark gc-able memory for that element. */
-
-void
-ggc_add_root (base, nelt, size, cb)
- void *base;
- int nelt, size;
- void (*cb) PARAMS ((void *));
-{
- struct ggc_root *x = (struct ggc_root *) xmalloc (sizeof (*x));
+struct traversal_state;
- x->next = roots;
- x->base = base;
- x->nelt = nelt;
- x->size = size;
- x->cb = cb;
+static int ggc_htab_delete (void **, void *);
+static hashval_t saving_htab_hash (const void *);
+static int saving_htab_eq (const void *, const void *);
+static int call_count (void **, void *);
+static int call_alloc (void **, void *);
+static int compare_ptr_data (const void *, const void *);
+static void relocate_ptrs (void *, void *);
+static void write_pch_globals (const struct ggc_root_tab * const *tab,
+ struct traversal_state *state);
+static double ggc_rlimit_bound (double);
- roots = x;
-}
+/* Maintain global roots that are preserved during GC. */
/* Process a slot of an htab by deleting it if it has not been marked. */
static int
-ggc_htab_delete (slot, info)
- void **slot;
- void *info;
+ggc_htab_delete (void **slot, void *info)
{
const struct ggc_cache_tab *r = (const struct ggc_cache_tab *) info;
/* Iterate through all registered roots and mark each element. */
void
-ggc_mark_roots ()
+ggc_mark_roots (void)
{
- struct ggc_root *x;
const struct ggc_root_tab *const *rt;
const struct ggc_root_tab *rti;
const struct ggc_cache_tab *const *ct;
for (i = 0; i < rti->nelt; i++)
(*rti->cb)(*(void **)((char *)rti->base + rti->stride * i));
- for (x = roots; x != NULL; x = x->next)
- {
- char *elt = x->base;
- int s = x->size, n = x->nelt;
- void (*cb) PARAMS ((void *)) = x->cb;
- int i;
-
- for (i = 0; i < n; ++i, elt += s)
- (*cb)(elt);
- }
+ ggc_mark_stringpool ();
/* Now scan all hash tables that have objects which are to be deleted if
they are not already marked. */
for (ct = gt_ggc_cache_rtab; *ct; ct++)
for (cti = *ct; cti->base != NULL; cti++)
if (*cti->base)
- htab_traverse (*cti->base, ggc_htab_delete, (PTR) cti);
+ {
+ ggc_set_mark (*cti->base);
+ htab_traverse_noresize (*cti->base, ggc_htab_delete, (void *) cti);
+ ggc_set_mark ((*cti->base)->entries);
+ }
}
/* Allocate a block of memory, then clear it. */
void *
-ggc_alloc_cleared (size)
- size_t size;
+ggc_alloc_cleared (size_t size)
{
void *buf = ggc_alloc (size);
memset (buf, 0, size);
/* Resize a block of memory, possibly re-allocating it. */
void *
-ggc_realloc (x, size)
- void *x;
- size_t size;
+ggc_realloc (void *x, size_t size)
{
void *r;
size_t old_size;
don't know that previously allocated size. Without that
knowledge we have to lose some initialization-tracking for the
old parts of the object. An alternative is to mark the whole
- old_size as reachable, but that would lose tracking of writes
+ old_size as reachable, but that would lose tracking of writes
after the end of the object (by small offsets). Discard the
handle to avoid handle leak. */
VALGRIND_DISCARD (VALGRIND_MAKE_NOACCESS ((char *) x + size,
/* Like ggc_alloc_cleared, but performs a multiplication. */
void *
-ggc_calloc (s1, s2)
- size_t s1, s2;
+ggc_calloc (size_t s1, size_t s2)
{
return ggc_alloc_cleared (s1 * s2);
}
+/* These are for splay_tree_new_ggc. */
+void *
+ggc_splay_alloc (int sz, void *nl)
+{
+ if (nl != NULL)
+ abort ();
+ return ggc_alloc (sz);
+}
+
+void
+ggc_splay_dont_free (void * x ATTRIBUTE_UNUSED, void *nl)
+{
+ if (nl != NULL)
+ abort ();
+}
+
/* Print statistics that are independent of the collector in use. */
#define SCALE(x) ((unsigned long) ((x) < 1024*10 \
? (x) \
#define LABEL(x) ((x) < 1024*10 ? ' ' : ((x) < 1024*1024*10 ? 'k' : 'M'))
void
-ggc_print_common_statistics (stream, stats)
- FILE *stream;
- ggc_statistics *stats;
+ggc_print_common_statistics (FILE *stream ATTRIBUTE_UNUSED,
+ ggc_statistics *stats)
{
- int code;
-
/* Set the pointer so that during collection we will actually gather
the statistics. */
ggc_stats = stats;
/* Then do one collection to fill in the statistics. */
ggc_collect ();
- /* Total the statistics. */
- for (code = 0; code < MAX_TREE_CODES; ++code)
+ /* At present, we don't really gather any interesting statistics. */
+
+ /* Don't gather statistics any more. */
+ ggc_stats = NULL;
+}
+\f
+/* Functions for saving and restoring GCable memory to disk. */
+
+static htab_t saving_htab;
+
+struct ptr_data
+{
+ void *obj;
+ void *note_ptr_cookie;
+ gt_note_pointers note_ptr_fn;
+ gt_handle_reorder reorder_fn;
+ size_t size;
+ void *new_addr;
+};
+
+#define POINTER_HASH(x) (hashval_t)((long)x >> 3)
+
+/* Register an object in the hash table. */
+
+int
+gt_pch_note_object (void *obj, void *note_ptr_cookie,
+ gt_note_pointers note_ptr_fn)
+{
+ struct ptr_data **slot;
+
+ if (obj == NULL || obj == (void *) 1)
+ return 0;
+
+ slot = (struct ptr_data **)
+ htab_find_slot_with_hash (saving_htab, obj, POINTER_HASH (obj),
+ INSERT);
+ if (*slot != NULL)
+ {
+ if ((*slot)->note_ptr_fn != note_ptr_fn
+ || (*slot)->note_ptr_cookie != note_ptr_cookie)
+ abort ();
+ return 0;
+ }
+
+ *slot = xcalloc (sizeof (struct ptr_data), 1);
+ (*slot)->obj = obj;
+ (*slot)->note_ptr_fn = note_ptr_fn;
+ (*slot)->note_ptr_cookie = note_ptr_cookie;
+ if (note_ptr_fn == gt_pch_p_S)
+ (*slot)->size = strlen (obj) + 1;
+ else
+ (*slot)->size = ggc_get_size (obj);
+ return 1;
+}
+
+/* Register an object in the hash table. */
+
+void
+gt_pch_note_reorder (void *obj, void *note_ptr_cookie,
+ gt_handle_reorder reorder_fn)
+{
+ struct ptr_data *data;
+
+ if (obj == NULL || obj == (void *) 1)
+ return;
+
+ data = htab_find_with_hash (saving_htab, obj, POINTER_HASH (obj));
+ if (data == NULL
+ || data->note_ptr_cookie != note_ptr_cookie)
+ abort ();
+
+ data->reorder_fn = reorder_fn;
+}
+
+/* Hash and equality functions for saving_htab, callbacks for htab_create. */
+
+static hashval_t
+saving_htab_hash (const void *p)
+{
+ return POINTER_HASH (((struct ptr_data *)p)->obj);
+}
+
+static int
+saving_htab_eq (const void *p1, const void *p2)
+{
+ return ((struct ptr_data *)p1)->obj == p2;
+}
+
+/* Handy state for the traversal functions. */
+
+struct traversal_state
+{
+ FILE *f;
+ struct ggc_pch_data *d;
+ size_t count;
+ struct ptr_data **ptrs;
+ size_t ptrs_i;
+};
+
+/* Callbacks for htab_traverse. */
+
+static int
+call_count (void **slot, void *state_p)
+{
+ struct ptr_data *d = (struct ptr_data *)*slot;
+ struct traversal_state *state = (struct traversal_state *)state_p;
+
+ ggc_pch_count_object (state->d, d->obj, d->size);
+ state->count++;
+ return 1;
+}
+
+static int
+call_alloc (void **slot, void *state_p)
+{
+ struct ptr_data *d = (struct ptr_data *)*slot;
+ struct traversal_state *state = (struct traversal_state *)state_p;
+
+ d->new_addr = ggc_pch_alloc_object (state->d, d->obj, d->size);
+ state->ptrs[state->ptrs_i++] = d;
+ return 1;
+}
+
+/* Callback for qsort. */
+
+static int
+compare_ptr_data (const void *p1_p, const void *p2_p)
+{
+ struct ptr_data *p1 = *(struct ptr_data *const *)p1_p;
+ struct ptr_data *p2 = *(struct ptr_data *const *)p2_p;
+ return (((size_t)p1->new_addr > (size_t)p2->new_addr)
+ - ((size_t)p1->new_addr < (size_t)p2->new_addr));
+}
+
+/* Callbacks for note_ptr_fn. */
+
+static void
+relocate_ptrs (void *ptr_p, void *state_p)
+{
+ void **ptr = (void **)ptr_p;
+ struct traversal_state *state ATTRIBUTE_UNUSED
+ = (struct traversal_state *)state_p;
+ struct ptr_data *result;
+
+ if (*ptr == NULL || *ptr == (void *)1)
+ return;
+
+ result = htab_find_with_hash (saving_htab, *ptr, POINTER_HASH (*ptr));
+ if (result == NULL)
+ abort ();
+ *ptr = result->new_addr;
+}
+
+/* Write out, after relocation, the pointers in TAB. */
+static void
+write_pch_globals (const struct ggc_root_tab * const *tab,
+ struct traversal_state *state)
+{
+ const struct ggc_root_tab *const *rt;
+ const struct ggc_root_tab *rti;
+ size_t i;
+
+ for (rt = tab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ for (i = 0; i < rti->nelt; i++)
+ {
+ void *ptr = *(void **)((char *)rti->base + rti->stride * i);
+ struct ptr_data *new_ptr;
+ if (ptr == NULL || ptr == (void *)1)
+ {
+ if (fwrite (&ptr, sizeof (void *), 1, state->f)
+ != 1)
+ fatal_error ("can't write PCH file: %m");
+ }
+ else
+ {
+ new_ptr = htab_find_with_hash (saving_htab, ptr,
+ POINTER_HASH (ptr));
+ if (fwrite (&new_ptr->new_addr, sizeof (void *), 1, state->f)
+ != 1)
+ fatal_error ("can't write PCH file: %m");
+ }
+ }
+}
+
+/* Hold the information we need to mmap the file back in. */
+
+struct mmap_info
+{
+ size_t offset;
+ size_t size;
+ void *preferred_base;
+};
+
+/* Write out the state of the compiler to F. */
+
+void
+gt_pch_save (FILE *f)
+{
+ const struct ggc_root_tab *const *rt;
+ const struct ggc_root_tab *rti;
+ size_t i;
+ struct traversal_state state;
+ char *this_object = NULL;
+ size_t this_object_size = 0;
+ struct mmap_info mmi;
+ size_t page_size = getpagesize();
+
+ gt_pch_save_stringpool ();
+
+ saving_htab = htab_create (50000, saving_htab_hash, saving_htab_eq, free);
+
+ for (rt = gt_ggc_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ for (i = 0; i < rti->nelt; i++)
+ (*rti->pchw)(*(void **)((char *)rti->base + rti->stride * i));
+
+ for (rt = gt_pch_cache_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ for (i = 0; i < rti->nelt; i++)
+ (*rti->pchw)(*(void **)((char *)rti->base + rti->stride * i));
+
+ /* Prepare the objects for writing, determine addresses and such. */
+ state.f = f;
+ state.d = init_ggc_pch();
+ state.count = 0;
+ htab_traverse (saving_htab, call_count, &state);
+
+ mmi.size = ggc_pch_total_size (state.d);
+
+ /* Try to arrange things so that no relocation is necessary, but
+ don't try very hard. On most platforms, this will always work,
+ and on the rest it's a lot of work to do better.
+ (The extra work goes in HOST_HOOKS_GT_PCH_GET_ADDRESS and
+ HOST_HOOKS_GT_PCH_USE_ADDRESS.) */
+ mmi.preferred_base = host_hooks.gt_pch_get_address (mmi.size);
+
+#if HAVE_MMAP_FILE
+ if (mmi.preferred_base == NULL)
{
- stats->total_num_trees += stats->num_trees[code];
- stats->total_size_trees += stats->size_trees[code];
+ mmi.preferred_base = mmap (NULL, mmi.size,
+ PROT_READ | PROT_WRITE, MAP_PRIVATE,
+ fileno (state.f), 0);
+ if (mmi.preferred_base == (void *) MAP_FAILED)
+ mmi.preferred_base = NULL;
+ else
+ munmap (mmi.preferred_base, mmi.size);
}
- for (code = 0; code < NUM_RTX_CODE; ++code)
+#endif /* HAVE_MMAP_FILE */
+
+ ggc_pch_this_base (state.d, mmi.preferred_base);
+
+ state.ptrs = xmalloc (state.count * sizeof (*state.ptrs));
+ state.ptrs_i = 0;
+ htab_traverse (saving_htab, call_alloc, &state);
+ qsort (state.ptrs, state.count, sizeof (*state.ptrs), compare_ptr_data);
+
+ /* Write out all the scalar variables. */
+ for (rt = gt_pch_scalar_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ if (fwrite (rti->base, rti->stride, 1, f) != 1)
+ fatal_error ("can't write PCH file: %m");
+
+ /* Write out all the global pointers, after translation. */
+ write_pch_globals (gt_ggc_rtab, &state);
+ write_pch_globals (gt_pch_cache_rtab, &state);
+
+ ggc_pch_prepare_write (state.d, state.f);
+
+ /* Pad the PCH file so that the mmapped area starts on a page boundary. */
+ {
+ long o;
+ o = ftell (state.f) + sizeof (mmi);
+ if (o == -1)
+ fatal_error ("can't get position in PCH file: %m");
+ mmi.offset = page_size - o % page_size;
+ if (mmi.offset == page_size)
+ mmi.offset = 0;
+ mmi.offset += o;
+ }
+ if (fwrite (&mmi, sizeof (mmi), 1, state.f) != 1)
+ fatal_error ("can't write PCH file: %m");
+ if (mmi.offset != 0
+ && fseek (state.f, mmi.offset, SEEK_SET) != 0)
+ fatal_error ("can't write padding to PCH file: %m");
+
+ /* Actually write out the objects. */
+ for (i = 0; i < state.count; i++)
{
- stats->total_num_rtxs += stats->num_rtxs[code];
- stats->total_size_rtxs += stats->size_rtxs[code];
+ if (this_object_size < state.ptrs[i]->size)
+ {
+ this_object_size = state.ptrs[i]->size;
+ this_object = xrealloc (this_object, this_object_size);
+ }
+ memcpy (this_object, state.ptrs[i]->obj, state.ptrs[i]->size);
+ if (state.ptrs[i]->reorder_fn != NULL)
+ state.ptrs[i]->reorder_fn (state.ptrs[i]->obj,
+ state.ptrs[i]->note_ptr_cookie,
+ relocate_ptrs, &state);
+ state.ptrs[i]->note_ptr_fn (state.ptrs[i]->obj,
+ state.ptrs[i]->note_ptr_cookie,
+ relocate_ptrs, &state);
+ ggc_pch_write_object (state.d, state.f, state.ptrs[i]->obj,
+ state.ptrs[i]->new_addr, state.ptrs[i]->size);
+ if (state.ptrs[i]->note_ptr_fn != gt_pch_p_S)
+ memcpy (state.ptrs[i]->obj, this_object, state.ptrs[i]->size);
}
+ ggc_pch_finish (state.d, state.f);
+ gt_pch_fixup_stringpool ();
+
+ free (state.ptrs);
+ htab_delete (saving_htab);
+}
- /* Print the statistics for trees. */
- fprintf (stream, "\n%-17s%10s %16s %10s\n", "Tree",
- "Number", "Bytes", "% Total");
- for (code = 0; code < MAX_TREE_CODES; ++code)
- if (ggc_stats->num_trees[code])
- {
- fprintf (stream, "%-17s%10u%16ld%c %10.3f\n",
- tree_code_name[code],
- ggc_stats->num_trees[code],
- SCALE (ggc_stats->size_trees[code]),
- LABEL (ggc_stats->size_trees[code]),
- (100 * ((double) ggc_stats->size_trees[code])
- / ggc_stats->total_size_trees));
- }
- fprintf (stream,
- "%-17s%10u%16ld%c\n", "Total",
- ggc_stats->total_num_trees,
- SCALE (ggc_stats->total_size_trees),
- LABEL (ggc_stats->total_size_trees));
-
- /* Print the statistics for RTL. */
- fprintf (stream, "\n%-17s%10s %16s %10s\n", "RTX",
- "Number", "Bytes", "% Total");
- for (code = 0; code < NUM_RTX_CODE; ++code)
- if (ggc_stats->num_rtxs[code])
- {
- fprintf (stream, "%-17s%10u%16ld%c %10.3f\n",
- rtx_name[code],
- ggc_stats->num_rtxs[code],
- SCALE (ggc_stats->size_rtxs[code]),
- LABEL (ggc_stats->size_rtxs[code]),
- (100 * ((double) ggc_stats->size_rtxs[code])
- / ggc_stats->total_size_rtxs));
- }
- fprintf (stream,
- "%-17s%10u%16ld%c\n", "Total",
- ggc_stats->total_num_rtxs,
- SCALE (ggc_stats->total_size_rtxs),
- LABEL (ggc_stats->total_size_rtxs));
+/* Read the state of the compiler back in from F. */
- /* Don't gather statistics any more. */
- ggc_stats = NULL;
+void
+gt_pch_restore (FILE *f)
+{
+ const struct ggc_root_tab *const *rt;
+ const struct ggc_root_tab *rti;
+ size_t i;
+ struct mmap_info mmi;
+ void *addr;
+ bool needs_read;
+
+ /* Delete any deletable objects. This makes ggc_pch_read much
+ faster, as it can be sure that no GCable objects remain other
+ than the ones just read in. */
+ for (rt = gt_ggc_deletable_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ memset (rti->base, 0, rti->stride);
+
+ /* Read in all the scalar variables. */
+ for (rt = gt_pch_scalar_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ if (fread (rti->base, rti->stride, 1, f) != 1)
+ fatal_error ("can't read PCH file: %m");
+
+ /* Read in all the global pointers, in 6 easy loops. */
+ for (rt = gt_ggc_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ for (i = 0; i < rti->nelt; i++)
+ if (fread ((char *)rti->base + rti->stride * i,
+ sizeof (void *), 1, f) != 1)
+ fatal_error ("can't read PCH file: %m");
+
+ for (rt = gt_pch_cache_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ for (i = 0; i < rti->nelt; i++)
+ if (fread ((char *)rti->base + rti->stride * i,
+ sizeof (void *), 1, f) != 1)
+ fatal_error ("can't read PCH file: %m");
+
+ if (fread (&mmi, sizeof (mmi), 1, f) != 1)
+ fatal_error ("can't read PCH file: %m");
+
+ if (host_hooks.gt_pch_use_address (mmi.preferred_base, mmi.size))
+ {
+#if HAVE_MMAP_FILE
+ void *mmap_result;
+
+ mmap_result = mmap (mmi.preferred_base, mmi.size,
+ PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
+ fileno (f), mmi.offset);
+
+ /* The file might not be mmap-able. */
+ needs_read = mmap_result == (void *) MAP_FAILED;
+
+ /* Sanity check for broken MAP_FIXED. */
+ if (! needs_read && mmap_result != mmi.preferred_base)
+ abort ();
+#else
+ needs_read = true;
+#endif
+ addr = mmi.preferred_base;
+ }
+ else
+ {
+#if HAVE_MMAP_FILE
+ addr = mmap (mmi.preferred_base, mmi.size,
+ PROT_READ | PROT_WRITE, MAP_PRIVATE,
+ fileno (f), mmi.offset);
+
+#if HAVE_MINCORE
+ if (addr != mmi.preferred_base)
+ {
+ size_t page_size = getpagesize();
+ char one_byte;
+
+ if (addr != (void *) MAP_FAILED)
+ munmap (addr, mmi.size);
+
+ /* We really want to be mapped at mmi.preferred_base
+ so we're going to resort to MAP_FIXED. But before,
+ make sure that we can do so without destroying a
+ previously mapped area, by looping over all pages
+ that would be affected by the fixed mapping. */
+ errno = 0;
+
+ for (i = 0; i < mmi.size; i+= page_size)
+ if (mincore ((char *)mmi.preferred_base + i, page_size,
+ (void *)&one_byte) == -1
+ && errno == ENOMEM)
+ continue; /* The page is not mapped. */
+ else
+ break;
+
+ if (i >= mmi.size)
+ addr = mmap (mmi.preferred_base, mmi.size,
+ PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
+ fileno (f), mmi.offset);
+ }
+#endif /* HAVE_MINCORE */
+
+ needs_read = addr == (void *) MAP_FAILED;
+
+#else /* HAVE_MMAP_FILE */
+ needs_read = true;
+#endif /* HAVE_MMAP_FILE */
+ if (needs_read)
+ addr = xmalloc (mmi.size);
+ }
+
+ if (needs_read)
+ {
+ if (fseek (f, mmi.offset, SEEK_SET) != 0
+ || fread (&mmi, mmi.size, 1, f) != 1)
+ fatal_error ("can't read PCH file: %m");
+ }
+ else if (fseek (f, mmi.offset + mmi.size, SEEK_SET) != 0)
+ fatal_error ("can't read PCH file: %m");
+
+ ggc_pch_read (f, addr);
+
+ if (addr != mmi.preferred_base)
+ {
+ for (rt = gt_ggc_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ for (i = 0; i < rti->nelt; i++)
+ {
+ char **ptr = (char **)((char *)rti->base + rti->stride * i);
+ if (*ptr != NULL)
+ *ptr += (size_t)addr - (size_t)mmi.preferred_base;
+ }
+
+ for (rt = gt_pch_cache_rtab; *rt; rt++)
+ for (rti = *rt; rti->base != NULL; rti++)
+ for (i = 0; i < rti->nelt; i++)
+ {
+ char **ptr = (char **)((char *)rti->base + rti->stride * i);
+ if (*ptr != NULL)
+ *ptr += (size_t)addr - (size_t)mmi.preferred_base;
+ }
+
+ sorry ("had to relocate PCH");
+ }
+
+ gt_pch_restore_stringpool ();
+}
+
+/* Modify the bound based on rlimits. Keep the smallest number found. */
+static double
+ggc_rlimit_bound (double limit)
+{
+#if defined(HAVE_GETRLIMIT)
+ struct rlimit rlim;
+# ifdef RLIMIT_RSS
+ if (getrlimit (RLIMIT_RSS, &rlim) == 0
+ && rlim.rlim_cur != (rlim_t) RLIM_INFINITY
+ && rlim.rlim_cur < limit)
+ limit = rlim.rlim_cur;
+# endif
+# ifdef RLIMIT_DATA
+ if (getrlimit (RLIMIT_DATA, &rlim) == 0
+ && rlim.rlim_cur != (rlim_t) RLIM_INFINITY
+ && rlim.rlim_cur < limit)
+ limit = rlim.rlim_cur;
+# endif
+# ifdef RLIMIT_AS
+ if (getrlimit (RLIMIT_AS, &rlim) == 0
+ && rlim.rlim_cur != (rlim_t) RLIM_INFINITY
+ && rlim.rlim_cur < limit)
+ limit = rlim.rlim_cur;
+# endif
+#endif /* HAVE_GETRLIMIT */
+
+ return limit;
+}
+
+/* Heuristic to set a default for GGC_MIN_EXPAND. */
+int
+ggc_min_expand_heuristic (void)
+{
+ double min_expand = physmem_total();
+
+ /* Adjust for rlimits. */
+ min_expand = ggc_rlimit_bound (min_expand);
+
+ /* The heuristic is a percentage equal to 30% + 70%*(RAM/1GB), yielding
+ a lower bound of 30% and an upper bound of 100% (when RAM >= 1GB). */
+ min_expand /= 1024*1024*1024;
+ min_expand *= 70;
+ min_expand = MIN (min_expand, 70);
+ min_expand += 30;
+
+ return min_expand;
+}
+
+/* Heuristic to set a default for GGC_MIN_HEAPSIZE. */
+int
+ggc_min_heapsize_heuristic (void)
+{
+ double min_heap_kbytes = physmem_total();
+
+ /* Adjust for rlimits. */
+ min_heap_kbytes = ggc_rlimit_bound (min_heap_kbytes);
+
+ min_heap_kbytes /= 1024; /* convert to Kbytes. */
+
+ /* The heuristic is RAM/8, with a lower bound of 4M and an upper
+ bound of 128M (when RAM >= 1GB). */
+ min_heap_kbytes /= 8;
+ min_heap_kbytes = MAX (min_heap_kbytes, 4 * 1024);
+ min_heap_kbytes = MIN (min_heap_kbytes, 128 * 1024);
+
+ return min_heap_kbytes;
+}
+
+void
+init_ggc_heuristics (void)
+{
+#ifndef ENABLE_GC_ALWAYS_COLLECT
+ set_param_value ("ggc-min-expand", ggc_min_expand_heuristic());
+ set_param_value ("ggc-min-heapsize", ggc_min_heapsize_heuristic());
+#endif
}
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