| /* Garbage collection for the GNU compiler. |
| Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc. |
| |
| This file is part of GNU CC. |
| |
| 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. |
| |
| GNU CC 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. */ |
| |
| #include "varray.h" |
| |
| /* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with |
| an external gc library that might be linked in. */ |
| |
| /* 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 rtx_def; |
| struct rtvec_def; |
| struct stmt_status; |
| union tree_node; |
| struct varasm_status; |
| |
| /* Constants for general use. */ |
| extern const char empty_string[]; /* empty string */ |
| extern const char digit_vector[]; /* "0" .. "9" */ |
| #define digit_string(d) (digit_vector + ((d) * 2)) |
| |
| /* 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_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 *)); |
| |
| /* 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)) |
| |
| #define ggc_mark_rtx(EXPR) \ |
| do { \ |
| rtx r__ = (EXPR); \ |
| if (ggc_test_and_set_mark (r__)) \ |
| ggc_mark_rtx_children (r__); \ |
| } 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) |
| |
| #define ggc_mark_rtvec(EXPR) \ |
| do { \ |
| rtvec v__ = (EXPR); \ |
| if (ggc_test_and_set_mark (v__)) \ |
| ggc_mark_rtvec_children (v__); \ |
| } while (0) |
| |
| #define ggc_mark(EXPR) \ |
| do { \ |
| const void *a__ = (EXPR); \ |
| if (a__ != NULL) \ |
| ggc_set_mark (a__); \ |
| } while (0) |
| |
| /* A GC implementation must provide these functions. */ |
| |
| /* Initialize the garbage collector. */ |
| extern void init_ggc PARAMS ((void)); |
| extern void init_stringpool PARAMS ((void)); |
| |
| /* 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)); |
| |
| /* 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)); |
| |
| /* Allocation. */ |
| |
| /* The internal primitive. */ |
| void *ggc_alloc PARAMS ((size_t)); |
| /* Like ggc_alloc, but allocates cleared memory. */ |
| void *ggc_alloc_cleared PARAMS ((size_t)); |
| |
| #define ggc_alloc_rtx(NSLOTS) \ |
| ((struct rtx_def *) ggc_alloc (sizeof (struct rtx_def) \ |
| + ((NSLOTS) - 1) * sizeof (rtunion))) |
| |
| #define ggc_alloc_rtvec(NELT) \ |
| ((struct rtvec_def *) ggc_alloc (sizeof (struct rtvec_def) \ |
| + ((NELT) - 1) * sizeof (rtx))) |
| |
| #define ggc_alloc_tree(LENGTH) ((union tree_node *) ggc_alloc (LENGTH)) |
| |
| /* 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. */ |
| const char *ggc_alloc_string PARAMS ((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. */ |
| void ggc_collect PARAMS ((void)); |
| |
| /* 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 *)); |
| |
| /* Callbacks to the languages. */ |
| |
| /* 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 *)); |
| |
| /* The FALSE_LABEL_STACK, declared in except.h, has language-dependent |
| semantics. If a front-end needs to mark the false label stack, it |
| should set this pointer to a non-NULL value. Otherwise, no marking |
| will be done. */ |
| extern void (*lang_mark_false_label_stack) PARAMS ((struct label_node *)); |
| |
| /* Mark functions for various structs scattered about. */ |
| |
| 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 *)); |
| |
| /* Statistics. */ |
| |
| /* This structure contains the statistics common to all collectors. |
| Particular collectors can extend this structure. */ |
| 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; |
| } 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_common_statistics PARAMS ((FILE *, ggc_statistics *)); |
| |
| /* Print allocation statistics. */ |
| extern void ggc_print_statistics PARAMS ((void)); |
| void stringpool_statistics PARAMS ((void)); |