1 /* Garbage collection for the GNU compiler.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007,
4 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "statistics.h"
26 /* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
27 an external gc library that might be linked in. */
29 /* Constants for general use. */
30 extern const char empty_string
[]; /* empty string */
32 /* Internal functions and data structures used by the GTY
33 machinery, including the generated gt*.[hc] files. */
35 /* The first parameter is a pointer to a pointer, the second a cookie. */
36 typedef void (*gt_pointer_operator
) (void *, void *);
38 #include "gtype-desc.h"
40 /* One of these applies its third parameter (with cookie in the fourth
41 parameter) to each pointer in the object pointed to by the first
42 parameter, using the second parameter. */
43 typedef void (*gt_note_pointers
) (void *, void *, gt_pointer_operator
,
46 /* One of these is called before objects are re-ordered in memory.
47 The first parameter is the original object, the second is the
48 subobject that has had its pointers reordered, the third parameter
49 can compute the new values of a pointer when given the cookie in
50 the fourth parameter. */
51 typedef void (*gt_handle_reorder
) (void *, void *, gt_pointer_operator
,
54 /* Used by the gt_pch_n_* routines. Register an object in the hash table. */
55 extern int gt_pch_note_object (void *, void *, gt_note_pointers
,
58 /* Used by the gt_pch_n_* routines. Register that an object has a reorder
60 extern void gt_pch_note_reorder (void *, void *, gt_handle_reorder
);
62 /* Mark the object in the first parameter and anything it points to. */
63 typedef void (*gt_pointer_walker
) (void *);
65 /* Structures for the easy way to mark roots.
66 In an array, terminated by having base == NULL. */
72 gt_pointer_walker pchw
;
74 #define LAST_GGC_ROOT_TAB { NULL, 0, 0, NULL, NULL }
75 /* Pointers to arrays of ggc_root_tab, terminated by NULL. */
76 extern const struct ggc_root_tab
* const gt_ggc_rtab
[];
77 extern const struct ggc_root_tab
* const gt_ggc_deletable_rtab
[];
78 extern const struct ggc_root_tab
* const gt_pch_cache_rtab
[];
79 extern const struct ggc_root_tab
* const gt_pch_scalar_rtab
[];
81 /* Structure for hash table cache marking. */
83 struct ggc_cache_tab
{
88 gt_pointer_walker pchw
;
89 int (*marked_p
) (const void *);
91 #define LAST_GGC_CACHE_TAB { NULL, 0, 0, NULL, NULL, NULL }
92 /* Pointers to arrays of ggc_cache_tab, terminated by NULL. */
93 extern const struct ggc_cache_tab
* const gt_ggc_cache_rtab
[];
95 /* If EXPR is not NULL and previously unmarked, mark it and evaluate
96 to true. Otherwise evaluate to false. */
97 #define ggc_test_and_set_mark(EXPR) \
98 ((EXPR) != NULL && ((void *) (EXPR)) != (void *) 1 && ! ggc_set_mark (EXPR))
100 #define ggc_mark(EXPR) \
102 const void *const a__ = (EXPR); \
103 if (a__ != NULL && a__ != (void *) 1) \
104 ggc_set_mark (a__); \
107 /* Actually set the mark on a particular region of memory, but don't
108 follow pointers. This function is called by ggc_mark_*. It
109 returns zero if the object was not previously marked; nonzero if
110 the object was already marked, or if, for any other reason,
111 pointers in this data structure should not be traversed. */
112 extern int ggc_set_mark (const void *);
114 /* Return 1 if P has been marked, zero otherwise.
115 P must have been allocated by the GC allocator; it mustn't point to
116 static objects, stack variables, or memory allocated with malloc. */
117 extern int ggc_marked_p (const void *);
119 /* PCH and GGC handling for strings, mostly trivial. */
120 extern void gt_pch_n_S (const void *);
121 extern void gt_ggc_m_S (const void *);
123 /* End of GTY machinery API. */
127 /* Initialize the string pool. */
128 extern void init_stringpool (void);
130 /* Initialize the garbage collector. */
131 extern void init_ggc (void);
133 /* When true, identifier nodes are considered as GC roots. When
134 false, identifier nodes are treated like any other GC-allocated
135 object, and the identifier hash table is treated as a weak
137 extern bool ggc_protect_identifiers
;
139 /* Write out all GCed objects to F. */
140 extern void gt_pch_save (FILE *f
);
145 /* The internal primitive. */
146 extern void *ggc_internal_alloc_stat (size_t MEM_STAT_DECL
)
149 extern size_t ggc_round_alloc_size (size_t requested_size
);
151 #define ggc_internal_alloc(s) ggc_internal_alloc_stat (s MEM_STAT_INFO)
153 /* Allocate an object of the specified type and size. */
154 extern void *ggc_alloc_typed_stat (enum gt_types_enum
, size_t MEM_STAT_DECL
)
157 #define ggc_alloc_typed(s, z) ggc_alloc_typed_stat (s, z MEM_STAT_INFO)
159 /* Allocates cleared memory. */
160 extern void *ggc_internal_cleared_alloc_stat (size_t MEM_STAT_DECL
)
163 /* Resize a block. */
164 extern void *ggc_realloc_stat (void *, size_t MEM_STAT_DECL
);
166 /* Free a block. To be used when known for certain it's not reachable. */
167 extern void ggc_free (void *);
169 extern void dump_ggc_loc_statistics (bool);
172 #define GGC_RESIZEVEC(T, P, N) \
173 ((T *) ggc_realloc_stat ((P), (N) * sizeof (T) MEM_STAT_INFO))
175 #define GGC_RESIZEVAR(T, P, N) \
176 ((T *) ggc_realloc_stat ((P), (N) MEM_STAT_INFO))
179 ggc_internal_vec_alloc_stat (size_t s
, size_t c MEM_STAT_DECL
)
181 return ggc_internal_alloc_stat (c
* s PASS_MEM_STAT
);
185 ggc_internal_cleared_vec_alloc_stat (size_t s
, size_t c MEM_STAT_DECL
)
187 return ggc_internal_cleared_alloc_stat (c
* s PASS_MEM_STAT
);
190 #define ggc_internal_cleared_vec_alloc(s, c) \
191 (ggc_internal_cleared_vec_alloc_stat ((s), (c) MEM_STAT_INFO))
194 ggc_alloc_atomic_stat (size_t s MEM_STAT_DECL
)
196 return ggc_internal_alloc_stat (s PASS_MEM_STAT
);
199 #define ggc_alloc_atomic(S) (ggc_alloc_atomic_stat ((S) MEM_STAT_INFO))
201 #define ggc_alloc_cleared_atomic(S) \
202 (ggc_internal_cleared_alloc_stat ((S) MEM_STAT_INFO))
204 extern void *ggc_cleared_alloc_htab_ignore_args (size_t, size_t)
207 extern void *ggc_cleared_alloc_ptr_array_two_args (size_t, size_t)
210 #define htab_create_ggc(SIZE, HASH, EQ, DEL) \
211 htab_create_typed_alloc (SIZE, HASH, EQ, DEL, \
212 ggc_cleared_alloc_htab_ignore_args, \
213 ggc_cleared_alloc_ptr_array_two_args, \
216 #define splay_tree_new_ggc(COMPARE, ALLOC_TREE, ALLOC_NODE) \
217 splay_tree_new_typed_alloc (COMPARE, NULL, NULL, &ALLOC_TREE, &ALLOC_NODE, \
218 &ggc_splay_dont_free, NULL)
220 extern void *ggc_splay_alloc (enum gt_types_enum
, int, void *)
223 extern void ggc_splay_dont_free (void *, void *);
225 /* Allocate a gc-able string, and fill it with LENGTH bytes from CONTENTS.
226 If LENGTH is -1, then CONTENTS is assumed to be a
227 null-terminated string and the memory sized accordingly. */
228 extern const char *ggc_alloc_string_stat (const char *contents
, int length
231 #define ggc_alloc_string(c, l) ggc_alloc_string_stat (c, l MEM_STAT_INFO)
233 /* Make a copy of S, in GC-able memory. */
234 #define ggc_strdup(S) ggc_alloc_string_stat ((S), -1 MEM_STAT_INFO)
236 /* Invoke the collector. Garbage collection occurs only when this
237 function is called, not during allocations. */
238 extern void ggc_collect (void);
240 /* Register an additional root table. This can be useful for some
241 plugins. Does nothing if the passed pointer is NULL. */
242 extern void ggc_register_root_tab (const struct ggc_root_tab
*);
244 /* Register an additional cache table. This can be useful for some
245 plugins. Does nothing if the passed pointer is NULL. */
246 extern void ggc_register_cache_tab (const struct ggc_cache_tab
*);
248 /* Read objects previously saved with gt_pch_save from F. */
249 extern void gt_pch_restore (FILE *f
);
253 /* Print allocation statistics. */
254 extern void ggc_print_statistics (void);
256 extern void stringpool_statistics (void);
259 extern void init_ggc_heuristics (void);
261 /* Zone collection. */
263 /* For regular rtl allocations. */
264 extern struct alloc_zone rtl_zone
;
266 /* For regular tree allocations. */
267 extern struct alloc_zone tree_zone
;
269 /* For IDENTIFIER_NODE allocations. */
270 extern struct alloc_zone tree_id_zone
;
272 #define ggc_alloc_rtvec_sized(NELT) \
273 ggc_alloc_zone_rtvec_def (sizeof (struct rtvec_def) \
274 + ((NELT) - 1) * sizeof (rtx), \
277 #if defined (GGC_ZONE) && !defined (GENERATOR_FILE)
279 /* Allocate an object into the specified allocation zone. */
280 extern void *ggc_internal_alloc_zone_stat (size_t,
281 struct alloc_zone
* MEM_STAT_DECL
)
284 extern void *ggc_internal_cleared_alloc_zone_stat (size_t,
285 struct alloc_zone
* MEM_STAT_DECL
)
289 ggc_internal_zone_alloc_stat (struct alloc_zone
* z
, size_t s MEM_STAT_DECL
)
291 return ggc_internal_alloc_zone_stat (s
, z PASS_MEM_STAT
);
295 ggc_internal_zone_cleared_alloc_stat (struct alloc_zone
* z
, size_t s
298 return ggc_internal_cleared_alloc_zone_stat (s
, z PASS_MEM_STAT
);
302 ggc_internal_zone_vec_alloc_stat (struct alloc_zone
* z
, size_t s
, size_t n
305 return ggc_internal_alloc_zone_stat (s
* n
, z PASS_MEM_STAT
);
312 ggc_internal_zone_alloc_stat (struct alloc_zone
* z ATTRIBUTE_UNUSED
,
313 size_t s MEM_STAT_DECL
)
315 return ggc_internal_alloc_stat (s PASS_MEM_STAT
);
319 ggc_internal_zone_cleared_alloc_stat (struct alloc_zone
* z ATTRIBUTE_UNUSED
,
320 size_t s MEM_STAT_DECL
)
322 return ggc_internal_cleared_alloc_stat (s PASS_MEM_STAT
);
326 ggc_internal_zone_vec_alloc_stat (struct alloc_zone
* z ATTRIBUTE_UNUSED
,
327 size_t s
, size_t n MEM_STAT_DECL
)
329 return ggc_internal_vec_alloc_stat (s
, n PASS_MEM_STAT
);
334 /* Memory statistics passing versions of some allocators. Too few of them to
335 make gengtype produce them, so just define the needed ones here. */
336 static inline struct rtx_def
*
337 ggc_alloc_zone_rtx_def_stat (struct alloc_zone
* z
, size_t s MEM_STAT_DECL
)
339 return (struct rtx_def
*) ggc_internal_zone_alloc_stat (z
, s PASS_MEM_STAT
);
342 static inline union tree_node
*
343 ggc_alloc_zone_tree_node_stat (struct alloc_zone
* z
, size_t s MEM_STAT_DECL
)
345 return (union tree_node
*) ggc_internal_zone_alloc_stat (z
, s PASS_MEM_STAT
);
348 static inline union tree_node
*
349 ggc_alloc_zone_cleared_tree_node_stat (struct alloc_zone
* z
, size_t s
352 return (union tree_node
*)
353 ggc_internal_zone_cleared_alloc_stat (z
, s PASS_MEM_STAT
);
356 static inline union gimple_statement_d
*
357 ggc_alloc_cleared_gimple_statement_d_stat (size_t s MEM_STAT_DECL
)
359 return (union gimple_statement_d
*)
360 ggc_internal_cleared_alloc_stat (s PASS_MEM_STAT
);