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237 lines
8.8 KiB
C
237 lines
8.8 KiB
C
/* Garbage collection for the GNU compiler.
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Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "varray.h"
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/* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
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an external gc library that might be linked in. */
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/* These structures are defined in various headers throughout the
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compiler. However, rather than force everyone who includes this
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header to include all the headers in which they are declared, we
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just forward-declare them here. */
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struct eh_status;
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struct emit_status;
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struct expr_status;
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struct hash_table;
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struct label_node;
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struct rtx_def;
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struct rtvec_def;
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struct stmt_status;
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union tree_node;
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struct varasm_status;
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/* Constants for general use. */
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extern const char empty_string[]; /* empty string */
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extern const char digit_vector[]; /* "0" .. "9" */
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#define digit_string(d) (digit_vector + ((d) * 2))
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/* Trees that have been marked, but whose children still need marking. */
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extern varray_type ggc_pending_trees;
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/* Manipulate global roots that are needed between calls to gc. */
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extern void ggc_add_root PARAMS ((void *base, int nelt,
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int size, void (*)(void *)));
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extern void ggc_add_rtx_root PARAMS ((struct rtx_def **, int nelt));
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extern void ggc_add_tree_root PARAMS ((union tree_node **,
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int nelt));
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extern void ggc_add_rtx_varray_root PARAMS ((struct varray_head_tag **,
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int nelt));
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extern void ggc_add_tree_varray_root PARAMS ((struct varray_head_tag **,
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int nelt));
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extern void ggc_add_tree_hash_table_root PARAMS ((struct hash_table **,
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int nelt));
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extern void ggc_del_root PARAMS ((void *base));
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/* Types used for mark test and marking functions, if specified, in call
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below. */
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typedef int (*ggc_htab_marked_p) PARAMS ((const void *));
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typedef void (*ggc_htab_mark) PARAMS ((const void *));
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/* Add a hash table to be scanned when all roots have been processed. We
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delete any entry in the table that has not been marked. The argument is
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really htab_t. */
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extern void ggc_add_deletable_htab PARAMS ((PTR, ggc_htab_marked_p,
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ggc_htab_mark));
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/* Mark nodes from the gc_add_root callback. These functions follow
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pointers to mark other objects too. */
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extern void ggc_mark_rtx_varray PARAMS ((struct varray_head_tag *));
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extern void ggc_mark_tree_varray PARAMS ((struct varray_head_tag *));
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extern void ggc_mark_tree_hash_table PARAMS ((struct hash_table *));
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extern void ggc_mark_roots PARAMS ((void));
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extern void ggc_mark_rtx_children PARAMS ((struct rtx_def *));
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extern void ggc_mark_rtvec_children PARAMS ((struct rtvec_def *));
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/* If EXPR is not NULL and previously unmarked, mark it and evaluate
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to true. Otherwise evaluate to false. */
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#define ggc_test_and_set_mark(EXPR) \
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((EXPR) != NULL && ! ggc_set_mark (EXPR))
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#define ggc_mark_rtx(EXPR) \
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do { \
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rtx r__ = (EXPR); \
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if (ggc_test_and_set_mark (r__)) \
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ggc_mark_rtx_children (r__); \
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} while (0)
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#define ggc_mark_tree(EXPR) \
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do { \
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tree t__ = (EXPR); \
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if (ggc_test_and_set_mark (t__)) \
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VARRAY_PUSH_TREE (ggc_pending_trees, t__); \
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} while (0)
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#define ggc_mark_nonnull_tree(EXPR) \
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do { \
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tree t__ = (EXPR); \
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if (! ggc_set_mark (t__)) \
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VARRAY_PUSH_TREE (ggc_pending_trees, t__); \
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} while (0)
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#define ggc_mark_rtvec(EXPR) \
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do { \
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rtvec v__ = (EXPR); \
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if (ggc_test_and_set_mark (v__)) \
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ggc_mark_rtvec_children (v__); \
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} while (0)
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#define ggc_mark(EXPR) \
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do { \
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const void *a__ = (EXPR); \
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if (a__ != NULL) \
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ggc_set_mark (a__); \
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} while (0)
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/* A GC implementation must provide these functions. */
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/* Initialize the garbage collector. */
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extern void init_ggc PARAMS ((void));
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extern void init_stringpool PARAMS ((void));
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/* Start a new GGC context. Memory allocated in previous contexts
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will not be collected while the new context is active. */
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extern void ggc_push_context PARAMS ((void));
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/* Finish a GC context. Any uncollected memory in the new context
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will be merged with the old context. */
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extern void ggc_pop_context PARAMS ((void));
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/* Allocation. */
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/* The internal primitive. */
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extern void *ggc_alloc PARAMS ((size_t));
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/* Like ggc_alloc, but allocates cleared memory. */
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extern void *ggc_alloc_cleared PARAMS ((size_t));
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#define ggc_alloc_rtx(NSLOTS) \
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((struct rtx_def *) ggc_alloc (sizeof (struct rtx_def) \
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+ ((NSLOTS) - 1) * sizeof (rtunion)))
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#define ggc_alloc_rtvec(NELT) \
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((struct rtvec_def *) ggc_alloc (sizeof (struct rtvec_def) \
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+ ((NELT) - 1) * sizeof (rtx)))
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#define ggc_alloc_tree(LENGTH) ((union tree_node *) ggc_alloc (LENGTH))
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/* Allocate a gc-able string, and fill it with LENGTH bytes from CONTENTS.
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If LENGTH is -1, then CONTENTS is assumed to be a
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null-terminated string and the memory sized accordingly. */
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extern const char *ggc_alloc_string PARAMS ((const char *contents,
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int length));
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/* Make a copy of S, in GC-able memory. */
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#define ggc_strdup(S) ggc_alloc_string((S), -1)
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/* Invoke the collector. Garbage collection occurs only when this
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function is called, not during allocations. */
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extern void ggc_collect PARAMS ((void));
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/* Actually set the mark on a particular region of memory, but don't
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follow pointers. This function is called by ggc_mark_*. It
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returns zero if the object was not previously marked; non-zero if
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the object was already marked, or if, for any other reason,
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pointers in this data structure should not be traversed. */
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extern int ggc_set_mark PARAMS ((const void *));
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/* Return 1 if P has been marked, zero otherwise.
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P must have been allocated by the GC allocator; it mustn't point to
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static objects, stack variables, or memory allocated with malloc. */
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extern int ggc_marked_p PARAMS ((const void *));
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/* Callbacks to the languages. */
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/* This is the language's opportunity to mark nodes held through
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the lang_specific hooks in the tree. */
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extern void lang_mark_tree PARAMS ((union tree_node *));
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/* The FALSE_LABEL_STACK, declared in except.h, has language-dependent
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semantics. If a front-end needs to mark the false label stack, it
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should set this pointer to a non-NULL value. Otherwise, no marking
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will be done. */
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extern void (*lang_mark_false_label_stack) PARAMS ((struct label_node *));
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/* Mark functions for various structs scattered about. */
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void mark_eh_status PARAMS ((struct eh_status *));
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void mark_emit_status PARAMS ((struct emit_status *));
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void mark_expr_status PARAMS ((struct expr_status *));
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void mark_stmt_status PARAMS ((struct stmt_status *));
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void mark_varasm_status PARAMS ((struct varasm_status *));
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void mark_optab PARAMS ((void *));
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/* Statistics. */
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/* This structure contains the statistics common to all collectors.
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Particular collectors can extend this structure. */
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typedef struct ggc_statistics
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{
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/* The Ith element is the number of nodes allocated with code I. */
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unsigned num_trees[256];
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/* The Ith element is the number of bytes allocated by nodes with
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code I. */
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size_t size_trees[256];
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/* The Ith element is the number of nodes allocated with code I. */
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unsigned num_rtxs[256];
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/* The Ith element is the number of bytes allocated by nodes with
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code I. */
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size_t size_rtxs[256];
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/* The total size of the tree nodes allocated. */
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size_t total_size_trees;
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/* The total size of the RTL nodes allocated. */
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size_t total_size_rtxs;
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/* The total number of tree nodes allocated. */
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unsigned total_num_trees;
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/* The total number of RTL nodes allocated. */
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unsigned total_num_rtxs;
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} ggc_statistics;
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/* Return the number of bytes allocated at the indicated address. */
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extern size_t ggc_get_size PARAMS ((const void *));
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/* Used by the various collectors to gather and print statistics that
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do not depend on the collector in use. */
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extern void ggc_print_common_statistics PARAMS ((FILE *, ggc_statistics *));
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/* Print allocation statistics. */
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extern void ggc_print_statistics PARAMS ((void));
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extern void stringpool_statistics PARAMS ((void));
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