/* Garbage collection for the GNU compiler.
- Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
+ Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC 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 version.
+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 3, or (at your option) any later
+version.
-GNU CC is distributed in the hope that it will be useful, but WITHOUT
-ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
-along with GNU CC; 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 "gansidecl.h"
-#include "varray.h"
+#ifndef GCC_GGC_H
+#define GCC_GGC_H
+#include "statistics.h"
/* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
an external gc library that might be linked in. */
-/* Language-specific code defines this variable to be either one (if
- it wants garbage collection), or zero (if it does not). */
-extern int ggc_p;
-
-/* These structures are defined in various headers throughout the
- compiler. However, rather than force everyone who includes this
- header to include all the headers in which they are declared, we
- just forward-declare them here. */
-struct eh_status;
-struct emit_status;
-struct expr_status;
-struct hash_table;
-struct label_node;
-struct rtvec_def;
-struct stmt_status;
-union tree_node;
-struct varasm_status;
-
/* Constants for general use. */
-extern char *empty_string;
-
-/* Trees that have been marked, but whose children still need marking. */
-extern varray_type ggc_pending_trees;
-
-/* Manipulate global roots that are needed between calls to gc. */
-void ggc_add_root PARAMS ((void *base, int nelt, int size, void (*)(void *)));
-void ggc_add_rtx_root PARAMS ((struct rtx_def **, int nelt));
-void ggc_add_tree_root PARAMS ((union tree_node **, int nelt));
-void ggc_add_string_root PARAMS ((char **, int nelt));
-void ggc_add_rtx_varray_root PARAMS ((struct varray_head_tag **, int nelt));
-void ggc_add_tree_varray_root PARAMS ((struct varray_head_tag **, int nelt));
-void ggc_add_tree_hash_table_root PARAMS ((struct hash_table **, int nelt));
-void ggc_del_root PARAMS ((void *base));
-
-/* Mark nodes from the gc_add_root callback. These functions follow
- pointers to mark other objects too. */
-extern void ggc_mark_rtx_varray PARAMS ((struct varray_head_tag *));
-extern void ggc_mark_tree_varray PARAMS ((struct varray_head_tag *));
-extern void ggc_mark_tree_hash_table PARAMS ((struct hash_table *));
-extern void ggc_mark_roots PARAMS ((void));
-
-extern void ggc_mark_rtx_children PARAMS ((struct rtx_def *));
-extern void ggc_mark_rtvec_children PARAMS ((struct rtvec_def *));
+extern const char empty_string[]; /* empty string */
+extern const char digit_vector[]; /* "0" .. "9" */
+#define digit_string(d) (digit_vector + ((d) * 2))
+
+/* Internal functions and data structures used by the GTY
+ machinery. */
+
+/* The first parameter is a pointer to a pointer, the second a cookie. */
+typedef void (*gt_pointer_operator) (void *, void *);
+
+#include "gtype-desc.h"
+
+/* One of these applies its third parameter (with cookie in the fourth
+ parameter) to each pointer in the object pointed to by the first
+ parameter, using the second parameter. */
+typedef void (*gt_note_pointers) (void *, void *, gt_pointer_operator,
+ void *);
+
+/* One of these is called before objects are re-ordered in memory.
+ The first parameter is the original object, the second is the
+ subobject that has had its pointers reordered, the third parameter
+ can compute the new values of a pointer when given the cookie in
+ the fourth parameter. */
+typedef void (*gt_handle_reorder) (void *, void *, gt_pointer_operator,
+ void *);
+
+/* Used by the gt_pch_n_* routines. Register an object in the hash table. */
+extern int gt_pch_note_object (void *, void *, gt_note_pointers,
+ enum gt_types_enum);
+
+/* Used by the gt_pch_n_* routines. Register that an object has a reorder
+ function. */
+extern void gt_pch_note_reorder (void *, void *, gt_handle_reorder);
+
+/* Mark the object in the first parameter and anything it points to. */
+typedef void (*gt_pointer_walker) (void *);
+
+/* Structures for the easy way to mark roots.
+ In an array, terminated by having base == NULL. */
+struct ggc_root_tab {
+ void *base;
+ size_t nelt;
+ size_t stride;
+ gt_pointer_walker cb;
+ gt_pointer_walker pchw;
+};
+#define LAST_GGC_ROOT_TAB { NULL, 0, 0, NULL, NULL }
+/* Pointers to arrays of ggc_root_tab, terminated by NULL. */
+extern const struct ggc_root_tab * const gt_ggc_rtab[];
+extern const struct ggc_root_tab * const gt_ggc_deletable_rtab[];
+extern const struct ggc_root_tab * const gt_pch_cache_rtab[];
+extern const struct ggc_root_tab * const gt_pch_scalar_rtab[];
+
+/* Structure for hash table cache marking. */
+struct htab;
+struct ggc_cache_tab {
+ struct htab * *base;
+ size_t nelt;
+ size_t stride;
+ gt_pointer_walker cb;
+ gt_pointer_walker pchw;
+ int (*marked_p) (const void *);
+};
+#define LAST_GGC_CACHE_TAB { NULL, 0, 0, NULL, NULL, NULL }
+/* Pointers to arrays of ggc_cache_tab, terminated by NULL. */
+extern const struct ggc_cache_tab * const gt_ggc_cache_rtab[];
/* If EXPR is not NULL and previously unmarked, mark it and evaluate
to true. Otherwise evaluate to false. */
#define ggc_test_and_set_mark(EXPR) \
- ((EXPR) != NULL && ! ggc_set_mark (EXPR))
+ ((EXPR) != NULL && ((void *) (EXPR)) != (void *) 1 && ! ggc_set_mark (EXPR))
-#define ggc_mark_rtx(EXPR) \
- do { \
- rtx r__ = (EXPR); \
- if (ggc_test_and_set_mark (r__)) \
- ggc_mark_rtx_children (r__); \
+#define ggc_mark(EXPR) \
+ do { \
+ const void *const a__ = (EXPR); \
+ if (a__ != NULL && a__ != (void *) 1) \
+ ggc_set_mark (a__); \
} while (0)
-#define ggc_mark_tree(EXPR) \
- do { \
- tree t__ = (EXPR); \
- if (ggc_test_and_set_mark (t__)) \
- VARRAY_PUSH_TREE (ggc_pending_trees, t__); \
- } while (0)
+/* Actually set the mark on a particular region of memory, but don't
+ follow pointers. This function is called by ggc_mark_*. It
+ returns zero if the object was not previously marked; nonzero if
+ the object was already marked, or if, for any other reason,
+ pointers in this data structure should not be traversed. */
+extern int ggc_set_mark (const void *);
-#define ggc_mark_rtvec(EXPR) \
- do { \
- rtvec v__ = (EXPR); \
- if (ggc_test_and_set_mark (v__)) \
- ggc_mark_rtvec_children (v__); \
- } while (0)
+/* Return 1 if P has been marked, zero otherwise.
+ P must have been allocated by the GC allocator; it mustn't point to
+ static objects, stack variables, or memory allocated with malloc. */
+extern int ggc_marked_p (const void *);
-#define ggc_mark_string(EXPR) \
- do { \
- const char *s__ = (EXPR); \
- if (s__ != NULL) \
- ggc_set_mark (s__); \
- } while (0)
+/* Mark the entries in the string pool. */
+extern void ggc_mark_stringpool (void);
-#define ggc_mark(EXPR) \
- do { \
- const void *a__ = (EXPR); \
- if (a__ != NULL) \
- ggc_set_mark (a__); \
- } while (0)
+/* Purge the entries in the string pool. */
+extern void ggc_purge_stringpool (void);
-/* Mark, but only if it was allocated in collectable memory. */
-extern void ggc_mark_if_gcable PARAMS ((const void *));
+/* Call ggc_set_mark on all the roots. */
-/* A GC implementation must provide these functions. */
+extern void ggc_mark_roots (void);
-/* Initialize the garbage collector. */
-extern void init_ggc PARAMS ((void));
+/* Save and restore the string pool entries for PCH. */
-/* Start a new GGC context. Memory allocated in previous contexts
- will not be collected while the new context is active. */
-extern void ggc_push_context PARAMS ((void));
+extern void gt_pch_save_stringpool (void);
+extern void gt_pch_fixup_stringpool (void);
+extern void gt_pch_restore_stringpool (void);
-/* Finish a GC context. Any uncollected memory in the new context
- will be merged with the old context. */
-extern void ggc_pop_context PARAMS ((void));
+/* PCH and GGC handling for strings, mostly trivial. */
-/* Allocation. */
+extern void gt_pch_p_S (void *, void *, gt_pointer_operator, void *);
+extern void gt_pch_n_S (const void *);
+extern void gt_ggc_m_S (const void *);
-/* The internal primitive. */
-void *ggc_alloc_obj PARAMS ((size_t, int));
+/* Initialize the string pool. */
+extern void init_stringpool (void);
-#define ggc_alloc_rtx(NSLOTS) \
- ((struct rtx_def *) ggc_alloc_obj (sizeof (struct rtx_def) \
- + ((NSLOTS) - 1) * sizeof (rtunion), 1))
+/* A GC implementation must provide these functions. They are internal
+ to the GC system. */
-#define ggc_alloc_rtvec(NELT) \
- ((struct rtvec_def *) ggc_alloc_obj (sizeof (struct rtvec_def) \
- + ((NELT) - 1) * sizeof (rtx), 1))
+/* Forward declare the zone structure. Only ggc_zone implements this. */
+struct alloc_zone;
-#define ggc_alloc_tree(LENGTH) \
- ((union tree_node *) ggc_alloc_obj ((LENGTH), 1))
+/* Initialize the garbage collector. */
+extern void init_ggc (void);
-#define ggc_alloc(SIZE) ggc_alloc_obj((SIZE), 0)
+/* Start a new GGC zone. */
+extern struct alloc_zone *new_ggc_zone (const char *);
-char *ggc_alloc_string PARAMS ((const char *contents, int length));
+/* Free a complete GGC zone, destroying everything in it. */
+extern void destroy_ggc_zone (struct alloc_zone *);
-/* Invoke the collector. This is really just a hint, but in the case of
- the simple collector, the only time it will happen. */
-void ggc_collect PARAMS ((void));
+struct ggc_pch_data;
-/* Actually set the mark on a particular region of memory, but don't
- follow pointers. This function is called by ggc_mark_*. It
- returns zero if the object was not previously marked; non-zero if
- the object was already marked, or if, for any other reason,
- pointers in this data structure should not be traversed. */
-int ggc_set_mark PARAMS ((const void *));
+/* Return a new ggc_pch_data structure. */
+extern struct ggc_pch_data *init_ggc_pch (void);
+
+/* The second parameter and third parameters give the address and size
+ of an object. Update the ggc_pch_data structure with as much of
+ that information as is necessary. The bool argument should be true
+ if the object is a string. */
+extern void ggc_pch_count_object (struct ggc_pch_data *, void *, size_t, bool,
+ enum gt_types_enum);
+
+/* Return the total size of the data to be written to hold all
+ the objects previously passed to ggc_pch_count_object. */
+extern size_t ggc_pch_total_size (struct ggc_pch_data *);
+
+/* The objects, when read, will most likely be at the address
+ in the second parameter. */
+extern void ggc_pch_this_base (struct ggc_pch_data *, void *);
+
+/* Assuming that the objects really do end up at the address
+ passed to ggc_pch_this_base, return the address of this object.
+ The bool argument should be true if the object is a string. */
+extern char *ggc_pch_alloc_object (struct ggc_pch_data *, void *, size_t, bool,
+ enum gt_types_enum);
-/* Callbacks to the languages. */
+/* Write out any initial information required. */
+extern void ggc_pch_prepare_write (struct ggc_pch_data *, FILE *);
+/* Write out this object, including any padding. The last argument should be
+ true if the object is a string. */
+extern void ggc_pch_write_object (struct ggc_pch_data *, FILE *, void *,
+ void *, size_t, bool);
+/* All objects have been written, write out any final information
+ required. */
+extern void ggc_pch_finish (struct ggc_pch_data *, FILE *);
-/* This is the language's opportunity to mark nodes held through
- the lang_specific hooks in the tree. */
-void lang_mark_tree PARAMS ((union tree_node *));
+/* A PCH file has just been read in at the address specified second
+ parameter. Set up the GC implementation for the new objects. */
+extern void ggc_pch_read (FILE *, void *);
-/* The FALSE_LABEL_STACK, declared in except.h, has
- language-dependent semantics. Each front-end should define this
- function appropriately. */
-void lang_mark_false_label_stack PARAMS ((struct label_node *));
+\f
+/* Allocation. */
+
+/* When set, ggc_collect will do collection. */
+extern bool ggc_force_collect;
+
+/* When true, identifier nodes are considered as GC roots. When
+ false, identifier nodes are treated like any other GC-allocated
+ object, and the identifier hash table is treated as a weak
+ hash. */
+extern bool ggc_protect_identifiers;
+
+/* The internal primitive. */
+extern void *ggc_alloc_stat (size_t MEM_STAT_DECL);
+#define ggc_alloc(s) ggc_alloc_stat (s MEM_STAT_INFO)
+/* Allocate an object of the specified type and size. */
+extern void *ggc_alloc_typed_stat (enum gt_types_enum, size_t MEM_STAT_DECL);
+#define ggc_alloc_typed(s,z) ggc_alloc_typed_stat (s,z MEM_STAT_INFO)
+/* Like ggc_alloc, but allocates cleared memory. */
+extern void *ggc_alloc_cleared_stat (size_t MEM_STAT_DECL);
+#define ggc_alloc_cleared(s) ggc_alloc_cleared_stat (s MEM_STAT_INFO)
+/* Resize a block. */
+extern void *ggc_realloc_stat (void *, size_t MEM_STAT_DECL);
+#define ggc_realloc(s,z) ggc_realloc_stat (s,z MEM_STAT_INFO)
+/* 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 *);
+
+extern void ggc_record_overhead (size_t, size_t, void * MEM_STAT_DECL);
+extern void ggc_free_overhead (void *);
+extern void ggc_prune_overhead_list (void);
+
+extern void dump_ggc_loc_statistics (bool);
+
+/* Type-safe, C++-friendly versions of ggc_alloc() and gcc_calloc(). */
+#define GGC_NEW(T) ((T *) ggc_alloc (sizeof (T)))
+#define GGC_CNEW(T) ((T *) ggc_alloc_cleared (sizeof (T)))
+#define GGC_NEWVEC(T, N) ((T *) ggc_alloc ((N) * sizeof(T)))
+#define GGC_CNEWVEC(T, N) ((T *) ggc_alloc_cleared ((N) * sizeof(T)))
+#define GGC_NEWVAR(T, S) ((T *) ggc_alloc ((S)))
+#define GGC_CNEWVAR(T, S) ((T *) ggc_alloc_cleared ((S)))
+#define GGC_RESIZEVEC(T, P, N) ((T *) ggc_realloc ((P), (N) * sizeof (T)))
+
+#define ggc_alloc_rtvec(NELT) \
+ ((rtvec) ggc_alloc_zone (sizeof (struct rtvec_def) + ((NELT) - 1) \
+ * sizeof (rtx), &rtl_zone))
+
+#define ggc_alloc_tree(LENGTH) ((tree) ggc_alloc_zone (LENGTH, &tree_zone))
+
+#define htab_create_ggc(SIZE, HASH, EQ, DEL) \
+ htab_create_alloc (SIZE, HASH, EQ, DEL, ggc_calloc, NULL)
+
+#define splay_tree_new_ggc(COMPARE) \
+ splay_tree_new_with_allocator (COMPARE, NULL, NULL, \
+ &ggc_splay_alloc, &ggc_splay_dont_free, \
+ NULL)
+extern void *ggc_splay_alloc (int, void *);
+extern void ggc_splay_dont_free (void *, void *);
+
+/* Allocate a gc-able string, and fill it with LENGTH bytes from CONTENTS.
+ If LENGTH is -1, then CONTENTS is assumed to be a
+ null-terminated string and the memory sized accordingly. */
+extern const char *ggc_alloc_string (const char *contents, int length);
+
+/* Make a copy of S, in GC-able memory. */
+#define ggc_strdup(S) ggc_alloc_string((S), -1)
+
+/* Invoke the collector. Garbage collection occurs only when this
+ function is called, not during allocations. */
+extern void ggc_collect (void);
-/* Mark functions for various structs scattered about. */
+/* Return the number of bytes allocated at the indicated address. */
+extern size_t ggc_get_size (const void *);
-void mark_eh_status PARAMS ((struct eh_status *));
-void mark_emit_status PARAMS ((struct emit_status *));
-void mark_expr_status PARAMS ((struct expr_status *));
-void mark_stmt_status PARAMS ((struct stmt_status *));
-void mark_varasm_status PARAMS ((struct varasm_status *));
-void mark_optab PARAMS ((void *));
+/* Write out all GCed objects to F. */
+extern void gt_pch_save (FILE *f);
+/* Read objects previously saved with gt_pch_save from F. */
+extern void gt_pch_restore (FILE *f);
+\f
/* Statistics. */
/* This structure contains the statistics common to all collectors.
Particular collectors can extend this structure. */
-typedef struct ggc_statistics
+typedef struct ggc_statistics
{
- /* The Ith element is the number of nodes allocated with code I. */
- unsigned num_trees[256];
- /* The Ith element is the number of bytes allocated by nodes with
- code I. */
- size_t size_trees[256];
- /* The Ith element is the number of nodes allocated with code I. */
- unsigned num_rtxs[256];
- /* The Ith element is the number of bytes allocated by nodes with
- code I. */
- size_t size_rtxs[256];
- /* The total size of the tree nodes allocated. */
- size_t total_size_trees;
- /* The total size of the RTL nodes allocated. */
- size_t total_size_rtxs;
- /* The total number of tree nodes allocated. */
- unsigned total_num_trees;
- /* The total number of RTL nodes allocated. */
- unsigned total_num_rtxs;
+ /* At present, we don't really gather any interesting statistics. */
+ int unused;
} ggc_statistics;
-/* Return the number of bytes allocated at the indicated address. */
-size_t ggc_get_size PARAMS ((const void *));
-
/* Used by the various collectors to gather and print statistics that
do not depend on the collector in use. */
-void ggc_print_statistics PARAMS ((FILE *, ggc_statistics *));
+extern void ggc_print_common_statistics (FILE *, ggc_statistics *);
/* Print allocation statistics. */
-extern void ggc_page_print_statistics PARAMS ((void));
+extern void ggc_print_statistics (void);
+extern void stringpool_statistics (void);
+
+/* Heuristics. */
+extern int ggc_min_expand_heuristic (void);
+extern int ggc_min_heapsize_heuristic (void);
+extern void init_ggc_heuristics (void);
+
+/* Zone collection. */
+#if defined (GGC_ZONE) && !defined (GENERATOR_FILE)
+
+/* For regular rtl allocations. */
+extern struct alloc_zone rtl_zone;
+/* For regular tree allocations. */
+extern struct alloc_zone tree_zone;
+/* For IDENTIFIER_NODE allocations. */
+extern struct alloc_zone tree_id_zone;
+
+/* Allocate an object into the specified allocation zone. */
+extern void *ggc_alloc_zone_stat (size_t, struct alloc_zone * MEM_STAT_DECL);
+# define ggc_alloc_zone(s,z) ggc_alloc_zone_stat (s,z MEM_STAT_INFO)
+# define ggc_alloc_zone_pass_stat(s,z) ggc_alloc_zone_stat (s,z PASS_MEM_STAT)
+#else
+
+# define ggc_alloc_zone(s, z) ggc_alloc (s)
+# define ggc_alloc_zone_pass_stat(s, z) ggc_alloc_stat (s PASS_MEM_STAT)
+
+#endif
+
+#endif
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