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Diffstat (limited to 'gcc-4.9/gcc/ggc.h')
| -rw-r--r-- | gcc-4.9/gcc/ggc.h | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/ggc.h b/gcc-4.9/gcc/ggc.h new file mode 100644 index 000000000..55f3fe9b0 --- /dev/null +++ b/gcc-4.9/gcc/ggc.h @@ -0,0 +1,287 @@ +/* Garbage collection for the GNU compiler. + + Copyright (C) 1998-2014 Free Software Foundation, Inc. + +This file is part of GCC. + +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. + +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 GCC; see the file COPYING3. If not see +<http://www.gnu.org/licenses/>. */ + +#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. */ + +/* Constants for general use. */ +extern const char empty_string[]; /* empty string */ + +/* Internal functions and data structures used by the GTY + machinery, including the generated gt*.[hc] files. */ + +#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); + +/* 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 && ((void *) (EXPR)) != (void *) 1 && ! ggc_set_mark (EXPR)) + +#define ggc_mark(EXPR) \ + do { \ + const void *const a__ = (EXPR); \ + if (a__ != NULL && a__ != (void *) 1) \ + ggc_set_mark (a__); \ + } 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 *); + +/* 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 *); + +/* PCH and GGC handling for strings, mostly trivial. */ +extern void gt_pch_n_S (const void *); +extern void gt_ggc_m_S (const void *); + +/* End of GTY machinery API. */ + +/* Initialize the string pool. */ +extern void init_stringpool (void); + +/* Initialize the garbage collector. */ +extern void init_ggc (void); + +/* 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; + +/* Write out all GCed objects to F. */ +extern void gt_pch_save (FILE *f); + + +/* Allocation. */ + +/* The internal primitive. */ +extern void *ggc_internal_alloc_stat (size_t MEM_STAT_DECL) + ATTRIBUTE_MALLOC; + +extern size_t ggc_round_alloc_size (size_t requested_size); + +#define ggc_internal_alloc(s) ggc_internal_alloc_stat (s MEM_STAT_INFO) + +/* Allocates cleared memory. */ +extern void *ggc_internal_cleared_alloc_stat (size_t MEM_STAT_DECL) + ATTRIBUTE_MALLOC; +#define ggc_internal_cleared_alloc(s) ggc_internal_cleared_alloc_stat (s MEM_STAT_INFO) + +/* Resize a block. */ +extern void *ggc_realloc_stat (void *, size_t MEM_STAT_DECL); + +/* Free a block. To be used when known for certain it's not reachable. */ +extern void ggc_free (void *); + +extern void dump_ggc_loc_statistics (bool); + +/* Reallocators. */ +#define GGC_RESIZEVEC(T, P, N) \ + ((T *) ggc_realloc_stat ((P), (N) * sizeof (T) MEM_STAT_INFO)) + +#define GGC_RESIZEVAR(T, P, N) \ + ((T *) ggc_realloc_stat ((P), (N) MEM_STAT_INFO)) + +static inline void * +ggc_internal_vec_alloc_stat (size_t s, size_t c MEM_STAT_DECL) +{ + return ggc_internal_alloc_stat (c * s PASS_MEM_STAT); +} + +static inline void * +ggc_internal_cleared_vec_alloc_stat (size_t s, size_t c MEM_STAT_DECL) +{ + return ggc_internal_cleared_alloc_stat (c * s PASS_MEM_STAT); +} + +#define ggc_internal_cleared_vec_alloc(s, c) \ + (ggc_internal_cleared_vec_alloc_stat ((s), (c) MEM_STAT_INFO)) + +static inline void * +ggc_alloc_atomic_stat (size_t s MEM_STAT_DECL) +{ + return ggc_internal_alloc_stat (s PASS_MEM_STAT); +} + +#define ggc_alloc_atomic(S) (ggc_alloc_atomic_stat ((S) MEM_STAT_INFO)) + +#define ggc_alloc_cleared_atomic(S) \ + (ggc_internal_cleared_alloc_stat ((S) MEM_STAT_INFO)) + +extern void *ggc_cleared_alloc_htab_ignore_args (size_t, size_t) + ATTRIBUTE_MALLOC; + +extern void *ggc_cleared_alloc_ptr_array_two_args (size_t, size_t) + ATTRIBUTE_MALLOC; + +#define htab_create_ggc(SIZE, HASH, EQ, DEL) \ + htab_create_typed_alloc (SIZE, HASH, EQ, DEL, \ + ggc_cleared_alloc_htab_ignore_args, \ + ggc_cleared_alloc_ptr_array_two_args, \ + ggc_free) + +#define splay_tree_new_ggc(COMPARE, ALLOC_TREE, ALLOC_NODE) \ + splay_tree_new_typed_alloc (COMPARE, NULL, NULL, &ALLOC_TREE, &ALLOC_NODE, \ + &ggc_splay_dont_free, NULL) + +extern void *ggc_splay_alloc (int, void *) + ATTRIBUTE_MALLOC; + +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_stat (const char *contents, int length + MEM_STAT_DECL); + +#define ggc_alloc_string(c, l) ggc_alloc_string_stat (c, l MEM_STAT_INFO) + +/* Make a copy of S, in GC-able memory. */ +#define ggc_strdup(S) ggc_alloc_string_stat ((S), -1 MEM_STAT_INFO) + +/* Invoke the collector. Garbage collection occurs only when this + function is called, not during allocations. */ +extern void ggc_collect (void); + +/* Register an additional root table. This can be useful for some + plugins. Does nothing if the passed pointer is NULL. */ +extern void ggc_register_root_tab (const struct ggc_root_tab *); + +/* Register an additional cache table. This can be useful for some + plugins. Does nothing if the passed pointer is NULL. */ +extern void ggc_register_cache_tab (const struct ggc_cache_tab *); + +/* Read objects previously saved with gt_pch_save from F. */ +extern void gt_pch_restore (FILE *f); + +/* Statistics. */ + +/* Print allocation statistics. */ +extern void ggc_print_statistics (void); + +extern void stringpool_statistics (void); + +/* Heuristics. */ +extern void init_ggc_heuristics (void); + +#define ggc_alloc_rtvec_sized(NELT) \ + ggc_alloc_rtvec_def (sizeof (struct rtvec_def) \ + + ((NELT) - 1) * sizeof (rtx)) \ + +/* Memory statistics passing versions of some allocators. Too few of them to + make gengtype produce them, so just define the needed ones here. */ +static inline struct rtx_def * +ggc_alloc_rtx_def_stat (size_t s MEM_STAT_DECL) +{ + return (struct rtx_def *) ggc_internal_alloc_stat (s PASS_MEM_STAT); +} + +static inline union tree_node * +ggc_alloc_tree_node_stat (size_t s MEM_STAT_DECL) +{ + return (union tree_node *) ggc_internal_alloc_stat (s PASS_MEM_STAT); +} + +static inline union tree_node * +ggc_alloc_cleared_tree_node_stat (size_t s MEM_STAT_DECL) +{ + return (union tree_node *) ggc_internal_cleared_alloc_stat (s PASS_MEM_STAT); +} + +static inline struct gimple_statement_base * +ggc_alloc_cleared_gimple_statement_stat (size_t s MEM_STAT_DECL) +{ + return (struct gimple_statement_base *) + ggc_internal_cleared_alloc_stat (s PASS_MEM_STAT); +} + +static inline struct simd_clone * +ggc_alloc_cleared_simd_clone_stat (size_t s MEM_STAT_DECL) +{ + return (struct simd_clone *) + ggc_internal_cleared_alloc_stat (s PASS_MEM_STAT); +} + +#endif |