318 lines
12 KiB
C
318 lines
12 KiB
C
/* Garbage collection for the GNU compiler.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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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, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifndef GCC_GGC_H
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#define GCC_GGC_H
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#include "statistics.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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/* 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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/* Internal functions and data structures used by the GTY
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machinery. */
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/* The first parameter is a pointer to a pointer, the second a cookie. */
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typedef void (*gt_pointer_operator) (void *, void *);
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#include "gtype-desc.h"
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/* One of these applies its third parameter (with cookie in the fourth
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parameter) to each pointer in the object pointed to by the first
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parameter, using the second parameter. */
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typedef void (*gt_note_pointers) (void *, void *, gt_pointer_operator,
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void *);
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/* One of these is called before objects are re-ordered in memory.
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The first parameter is the original object, the second is the
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subobject that has had its pointers reordered, the third parameter
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can compute the new values of a pointer when given the cookie in
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the fourth parameter. */
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typedef void (*gt_handle_reorder) (void *, void *, gt_pointer_operator,
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void *);
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/* Used by the gt_pch_n_* routines. Register an object in the hash table. */
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extern int gt_pch_note_object (void *, void *, gt_note_pointers,
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enum gt_types_enum);
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/* Used by the gt_pch_n_* routines. Register that an object has a reorder
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function. */
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extern void gt_pch_note_reorder (void *, void *, gt_handle_reorder);
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/* Mark the object in the first parameter and anything it points to. */
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typedef void (*gt_pointer_walker) (void *);
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/* Structures for the easy way to mark roots.
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In an array, terminated by having base == NULL. */
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struct ggc_root_tab {
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void *base;
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size_t nelt;
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size_t stride;
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gt_pointer_walker cb;
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gt_pointer_walker pchw;
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};
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#define LAST_GGC_ROOT_TAB { NULL, 0, 0, NULL, NULL }
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/* Pointers to arrays of ggc_root_tab, terminated by NULL. */
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extern const struct ggc_root_tab * const gt_ggc_rtab[];
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extern const struct ggc_root_tab * const gt_ggc_deletable_rtab[];
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extern const struct ggc_root_tab * const gt_pch_cache_rtab[];
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extern const struct ggc_root_tab * const gt_pch_scalar_rtab[];
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/* Structure for hash table cache marking. */
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struct htab;
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struct ggc_cache_tab {
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struct htab * *base;
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size_t nelt;
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size_t stride;
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gt_pointer_walker cb;
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gt_pointer_walker pchw;
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int (*marked_p) (const void *);
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};
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#define LAST_GGC_CACHE_TAB { NULL, 0, 0, NULL, NULL, NULL }
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/* Pointers to arrays of ggc_cache_tab, terminated by NULL. */
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extern const struct ggc_cache_tab * const gt_ggc_cache_rtab[];
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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 && ((void *) (EXPR)) != (void *) 1 && ! ggc_set_mark (EXPR))
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#define ggc_mark(EXPR) \
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do { \
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const void *const a__ = (EXPR); \
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if (a__ != NULL && a__ != (void *) 1) \
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ggc_set_mark (a__); \
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} while (0)
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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; nonzero 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 (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 (const void *);
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/* Mark the entries in the string pool. */
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extern void ggc_mark_stringpool (void);
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/* Call ggc_set_mark on all the roots. */
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extern void ggc_mark_roots (void);
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/* Save and restore the string pool entries for PCH. */
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extern void gt_pch_save_stringpool (void);
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extern void gt_pch_fixup_stringpool (void);
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extern void gt_pch_restore_stringpool (void);
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/* PCH and GGC handling for strings, mostly trivial. */
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extern void gt_pch_p_S (void *, void *, gt_pointer_operator, void *);
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extern void gt_pch_n_S (const void *);
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extern void gt_ggc_m_S (void *);
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/* Initialize the string pool. */
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extern void init_stringpool (void);
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/* A GC implementation must provide these functions. They are internal
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to the GC system. */
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/* Forward declare the zone structure. Only ggc_zone implements this. */
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struct alloc_zone;
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/* Initialize the garbage collector. */
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extern void init_ggc (void);
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/* Start a new GGC zone. */
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extern struct alloc_zone *new_ggc_zone (const char *);
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/* Free a complete GGC zone, destroying everything in it. */
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extern void destroy_ggc_zone (struct alloc_zone *);
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struct ggc_pch_data;
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/* Return a new ggc_pch_data structure. */
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extern struct ggc_pch_data *init_ggc_pch (void);
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/* The second parameter and third parameters give the address and size
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of an object. Update the ggc_pch_data structure with as much of
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that information as is necessary. The bool argument should be true
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if the object is a string. */
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extern void ggc_pch_count_object (struct ggc_pch_data *, void *, size_t, bool,
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enum gt_types_enum);
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/* Return the total size of the data to be written to hold all
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the objects previously passed to ggc_pch_count_object. */
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extern size_t ggc_pch_total_size (struct ggc_pch_data *);
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/* The objects, when read, will most likely be at the address
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in the second parameter. */
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extern void ggc_pch_this_base (struct ggc_pch_data *, void *);
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/* Assuming that the objects really do end up at the address
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passed to ggc_pch_this_base, return the address of this object.
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The bool argument should be true if the object is a string. */
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extern char *ggc_pch_alloc_object (struct ggc_pch_data *, void *, size_t, bool,
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enum gt_types_enum);
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/* Write out any initial information required. */
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extern void ggc_pch_prepare_write (struct ggc_pch_data *, FILE *);
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/* Write out this object, including any padding. The last argument should be
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true if the object is a string. */
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extern void ggc_pch_write_object (struct ggc_pch_data *, FILE *, void *,
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void *, size_t, bool);
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/* All objects have been written, write out any final information
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required. */
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extern void ggc_pch_finish (struct ggc_pch_data *, FILE *);
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/* A PCH file has just been read in at the address specified second
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parameter. Set up the GC implementation for the new objects. */
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extern void ggc_pch_read (FILE *, void *);
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/* Allocation. */
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/* When set, ggc_collect will do collection. */
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extern bool ggc_force_collect;
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/* The internal primitive. */
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extern void *ggc_alloc_stat (size_t MEM_STAT_DECL);
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#define ggc_alloc(s) ggc_alloc_stat (s MEM_STAT_INFO)
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/* Allocate an object of the specified type and size. */
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extern void *ggc_alloc_typed_stat (enum gt_types_enum, size_t MEM_STAT_DECL);
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#define ggc_alloc_typed(s,z) ggc_alloc_typed_stat (s,z MEM_STAT_INFO)
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/* Like ggc_alloc, but allocates cleared memory. */
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extern void *ggc_alloc_cleared_stat (size_t MEM_STAT_DECL);
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#define ggc_alloc_cleared(s) ggc_alloc_cleared_stat (s MEM_STAT_INFO)
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/* Resize a block. */
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extern void *ggc_realloc_stat (void *, size_t MEM_STAT_DECL);
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#define ggc_realloc(s,z) ggc_realloc_stat (s,z MEM_STAT_INFO)
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/* Like ggc_alloc_cleared, but performs a multiplication. */
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extern void *ggc_calloc (size_t, size_t);
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/* Free a block. To be used when known for certain it's not reachable. */
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extern void ggc_free (void *);
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extern void ggc_record_overhead (size_t, size_t, void * MEM_STAT_DECL);
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extern void ggc_free_overhead (void *);
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extern void ggc_prune_overhead_list (void);
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extern void dump_ggc_loc_statistics (void);
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/* Type-safe, C++-friendly versions of ggc_alloc() and gcc_calloc(). */
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#define GGC_NEW(T) ((T *) ggc_alloc (sizeof (T)))
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#define GGC_CNEW(T) ((T *) ggc_alloc_cleared (sizeof (T)))
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#define GGC_NEWVEC(T, N) ((T *) ggc_alloc ((N) * sizeof(T)))
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#define GGC_CNEWVEC(T, N) ((T *) ggc_alloc_cleared ((N) * sizeof(T)))
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#define GGC_NEWVAR(T, S) ((T *) ggc_alloc ((S)))
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#define GGC_CNEWVAR(T, S) ((T *) ggc_alloc_cleared ((S)))
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#define GGC_RESIZEVEC(T, P, N) ((T *) ggc_realloc ((P), (N) * sizeof (T)))
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#define ggc_alloc_rtvec(NELT) \
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((rtvec) ggc_alloc_zone (sizeof (struct rtvec_def) + ((NELT) - 1) \
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* sizeof (rtx), &rtl_zone))
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#define ggc_alloc_tree(LENGTH) ((tree) ggc_alloc_zone (LENGTH, &tree_zone))
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#define htab_create_ggc(SIZE, HASH, EQ, DEL) \
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htab_create_alloc (SIZE, HASH, EQ, DEL, ggc_calloc, NULL)
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#define splay_tree_new_ggc(COMPARE) \
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splay_tree_new_with_allocator (COMPARE, NULL, NULL, \
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&ggc_splay_alloc, &ggc_splay_dont_free, \
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NULL)
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extern void *ggc_splay_alloc (int, void *);
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extern void ggc_splay_dont_free (void *, void *);
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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 (const char *contents, 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 (void);
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/* Return the number of bytes allocated at the indicated address. */
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extern size_t ggc_get_size (const void *);
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/* Write out all GCed objects to F. */
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extern void gt_pch_save (FILE *f);
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/* Read objects previously saved with gt_pch_save from F. */
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extern void gt_pch_restore (FILE *f);
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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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/* At present, we don't really gather any interesting statistics. */
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int unused;
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} ggc_statistics;
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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 (FILE *, ggc_statistics *);
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/* Print allocation statistics. */
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extern void ggc_print_statistics (void);
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extern void stringpool_statistics (void);
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/* Heuristics. */
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extern int ggc_min_expand_heuristic (void);
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extern int ggc_min_heapsize_heuristic (void);
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extern void init_ggc_heuristics (void);
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/* Zone collection. */
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#if defined (GGC_ZONE) && !defined (GENERATOR_FILE)
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/* For regular rtl allocations. */
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extern struct alloc_zone rtl_zone;
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/* For regular tree allocations. */
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extern struct alloc_zone tree_zone;
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/* For IDENTIFIER_NODE allocations. */
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extern struct alloc_zone tree_id_zone;
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/* Allocate an object into the specified allocation zone. */
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extern void *ggc_alloc_zone_stat (size_t, struct alloc_zone * MEM_STAT_DECL);
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# define ggc_alloc_zone(s,z) ggc_alloc_zone_stat (s,z MEM_STAT_INFO)
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# define ggc_alloc_zone_pass_stat(s,z) ggc_alloc_zone_stat (s,z PASS_MEM_STAT)
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#else
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# define ggc_alloc_zone(s, z) ggc_alloc (s)
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# define ggc_alloc_zone_pass_stat(s, z) ggc_alloc_stat (s PASS_MEM_STAT)
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#endif
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#endif
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