| /* Garbage collection for the GNU compiler. |
| |
| Copyright (C) 1998-2017 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 |
| |
| /* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with |
| an external gc library that might be linked in. */ |
| |
| /* 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); |
| |
| /* generated function to clear caches in gc memory. */ |
| extern void gt_clear_caches (); |
| |
| /* 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_scalar_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 (size_t, void (*)(void *), size_t, |
| size_t CXX_MEM_STAT_INFO) |
| ATTRIBUTE_MALLOC; |
| |
| inline void * |
| ggc_internal_alloc (size_t s CXX_MEM_STAT_INFO) |
| { |
| return ggc_internal_alloc (s, NULL, 0, 1 PASS_MEM_STAT); |
| } |
| |
| extern size_t ggc_round_alloc_size (size_t requested_size); |
| |
| /* Allocates cleared memory. */ |
| extern void *ggc_internal_cleared_alloc (size_t, void (*)(void *), |
| size_t, size_t |
| CXX_MEM_STAT_INFO) ATTRIBUTE_MALLOC; |
| |
| inline void * |
| ggc_internal_cleared_alloc (size_t s CXX_MEM_STAT_INFO) |
| { |
| return ggc_internal_cleared_alloc (s, NULL, 0, 1 PASS_MEM_STAT); |
| } |
| |
| /* Resize a block. */ |
| extern void *ggc_realloc (void *, size_t CXX_MEM_STAT_INFO); |
| |
| /* 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); |
| |
| /* Reallocator. */ |
| #define GGC_RESIZEVEC(T, P, N) \ |
| ((T *) ggc_realloc ((P), (N) * sizeof (T) MEM_STAT_INFO)) |
| |
| template<typename T> |
| void |
| finalize (void *p) |
| { |
| static_cast<T *> (p)->~T (); |
| } |
| |
| template<typename T> |
| inline bool |
| need_finalization_p () |
| { |
| #if GCC_VERSION >= 4003 |
| return !__has_trivial_destructor (T); |
| #else |
| return true; |
| #endif |
| } |
| |
| template<typename T> |
| inline T * |
| ggc_alloc (ALONE_CXX_MEM_STAT_INFO) |
| { |
| if (need_finalization_p<T> ()) |
| return static_cast<T *> (ggc_internal_alloc (sizeof (T), finalize<T>, 0, 1 |
| PASS_MEM_STAT)); |
| else |
| return static_cast<T *> (ggc_internal_alloc (sizeof (T), NULL, 0, 1 |
| PASS_MEM_STAT)); |
| } |
| |
| template<typename T> |
| inline T * |
| ggc_cleared_alloc (ALONE_CXX_MEM_STAT_INFO) |
| { |
| if (need_finalization_p<T> ()) |
| return static_cast<T *> (ggc_internal_cleared_alloc (sizeof (T), |
| finalize<T>, 0, 1 |
| PASS_MEM_STAT)); |
| else |
| return static_cast<T *> (ggc_internal_cleared_alloc (sizeof (T), NULL, 0, 1 |
| PASS_MEM_STAT)); |
| } |
| |
| template<typename T> |
| inline T * |
| ggc_vec_alloc (size_t c CXX_MEM_STAT_INFO) |
| { |
| if (need_finalization_p<T> ()) |
| return static_cast<T *> (ggc_internal_alloc (c * sizeof (T), finalize<T>, |
| sizeof (T), c PASS_MEM_STAT)); |
| else |
| return static_cast<T *> (ggc_internal_alloc (c * sizeof (T), NULL, 0, 0 |
| PASS_MEM_STAT)); |
| } |
| |
| template<typename T> |
| inline T * |
| ggc_cleared_vec_alloc (size_t c CXX_MEM_STAT_INFO) |
| { |
| if (need_finalization_p<T> ()) |
| return static_cast<T *> (ggc_internal_cleared_alloc (c * sizeof (T), |
| finalize<T>, |
| sizeof (T), c |
| PASS_MEM_STAT)); |
| else |
| return static_cast<T *> (ggc_internal_cleared_alloc (c * sizeof (T), NULL, |
| 0, 0 PASS_MEM_STAT)); |
| } |
| |
| inline void * |
| ggc_alloc_atomic (size_t s CXX_MEM_STAT_INFO) |
| { |
| return ggc_internal_alloc (s PASS_MEM_STAT); |
| } |
| |
| /* 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 |
| CXX_MEM_STAT_INFO); |
| |
| /* Make a copy of S, in GC-able memory. */ |
| #define ggc_strdup(S) ggc_alloc_string ((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); |
| |
| /* Assume that all GGC memory is reachable and grow the limits for next collection. */ |
| extern void ggc_grow (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 *); |
| |
| /* 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) \ |
| (rtvec_def *) ggc_internal_alloc (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. */ |
| inline struct rtx_def * |
| ggc_alloc_rtx_def_stat (size_t s CXX_MEM_STAT_INFO) |
| { |
| return (struct rtx_def *) ggc_internal_alloc (s PASS_MEM_STAT); |
| } |
| |
| inline union tree_node * |
| ggc_alloc_tree_node_stat (size_t s CXX_MEM_STAT_INFO) |
| { |
| return (union tree_node *) ggc_internal_alloc (s PASS_MEM_STAT); |
| } |
| |
| inline union tree_node * |
| ggc_alloc_cleared_tree_node_stat (size_t s CXX_MEM_STAT_INFO) |
| { |
| return (union tree_node *) ggc_internal_cleared_alloc (s PASS_MEM_STAT); |
| } |
| |
| inline gimple * |
| ggc_alloc_cleared_gimple_statement_stat (size_t s CXX_MEM_STAT_INFO) |
| { |
| return (gimple *) ggc_internal_cleared_alloc (s PASS_MEM_STAT); |
| } |
| |
| inline void |
| gt_ggc_mx (const char *s) |
| { |
| ggc_test_and_set_mark (const_cast<char *> (s)); |
| } |
| |
| inline void |
| gt_pch_nx (const char *) |
| { |
| } |
| |
| inline void |
| gt_ggc_mx (int) |
| { |
| } |
| |
| inline void |
| gt_pch_nx (int) |
| { |
| } |
| |
| inline void |
| gt_pch_nx (unsigned int) |
| { |
| } |
| |
| #endif |