/* Garbage collection for the GNU compiler.
- Copyright (C) 1998 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
- This file is part of GNU CC.
+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 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.
+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. */
+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 "gansidecl.h"
+#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. */
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 label_node;
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;
-struct varray_head_tag;
-struct hash_table;
-/* Startup */
+/* Constants for general use. */
+extern char *empty_string;
-extern void init_ggc PROTO ((void));
+/* 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_string_root PARAMS ((char **, 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_string(EXPR) \
+ do { \
+ const char *s__ = (EXPR); \
+ if (s__ != NULL) \
+ ggc_set_mark (s__); \
+ } while (0)
+
+#define ggc_mark(EXPR) \
+ do { \
+ const void *a__ = (EXPR); \
+ if (a__ != NULL) \
+ ggc_set_mark (a__); \
+ } while (0)
+
+/* Mark, but only if it was allocated in collectable memory. */
+extern void ggc_mark_if_gcable PARAMS ((const void *));
+
+/* A GC implementation must provide these functions. */
+
+/* Initialize the garbage collector. */
+extern void init_ggc 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_pop_context PROTO ((void));
+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_push_context PROTO ((void));
+extern void ggc_pop_context PARAMS ((void));
/* Allocation. */
-struct rtx_def *ggc_alloc_rtx PROTO ((int nslots));
-struct rtvec_def *ggc_alloc_rtvec PROTO ((int nelt));
-union tree_node *ggc_alloc_tree PROTO ((int length));
-char *ggc_alloc_string PROTO ((const char *contents, int length));
-void *ggc_alloc PROTO ((size_t));
+/* The internal primitive. */
+void *ggc_alloc_obj PARAMS ((size_t, int));
+
+#define ggc_alloc_rtx(NSLOTS) \
+ ((struct rtx_def *) ggc_alloc_obj (sizeof (struct rtx_def) \
+ + ((NSLOTS) - 1) * sizeof (rtunion), 1))
+
+#define ggc_alloc_rtvec(NELT) \
+ ((struct rtvec_def *) ggc_alloc_obj (sizeof (struct rtvec_def) \
+ + ((NELT) - 1) * sizeof (rtx), 1))
+
+#define ggc_alloc_tree(LENGTH) \
+ ((union tree_node *) ggc_alloc_obj ((LENGTH), 1))
+
+#define ggc_alloc(SIZE) ggc_alloc_obj((SIZE), 0)
+
+char *ggc_alloc_string PARAMS ((const char *contents, int length));
/* Invoke the collector. This is really just a hint, but in the case of
the simple collector, the only time it will happen. */
+void ggc_collect PARAMS ((void));
-void ggc_collect PROTO ((void));
-
-/* Manipulate global roots that are needed between calls to gc. */
-void ggc_add_root PROTO ((void *base, int nelt, int size, void (*)(void *)));
-void ggc_add_rtx_root PROTO ((struct rtx_def **, int nelt));
-void ggc_add_tree_root PROTO ((union tree_node **, int nelt));
-void ggc_add_string_root PROTO ((char **, int nelt));
-void ggc_add_tree_varray_root PROTO ((struct varray_head_tag **, int nelt));
-void ggc_add_tree_hash_table_root PROTO ((struct hash_table **, int nelt));
-void ggc_del_root PROTO ((void *base));
-
-/* Mark nodes from the gc_add_root callback. */
-void ggc_mark_rtx PROTO ((struct rtx_def *));
-void ggc_mark_rtvec PROTO ((struct rtvec_def *));
-void ggc_mark_tree PROTO ((union tree_node *));
-void ggc_mark_tree_varray PROTO ((struct varray_head_tag *));
-void ggc_mark_tree_hash_table PROTO ((struct hash_table *));
-void ggc_mark_string PROTO ((char *));
-void ggc_mark PROTO ((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 PROTO ((union tree_node *));
-
-/* And similarly to free that data when the tree node is released. */
-void lang_cleanup_tree PROTO ((union tree_node *));
+void lang_mark_tree PARAMS ((union tree_node *));
/* The FALSE_LABEL_STACK, declared in except.h, has
language-dependent semantics. Each front-end should define this
function appropriately. */
-void lang_mark_false_label_stack PROTO ((struct label_node *));
+void lang_mark_false_label_stack PARAMS ((struct label_node *));
/* Mark functions for various structs scattered about. */
-void mark_eh_state PROTO ((struct eh_status *));
-void mark_stmt_state PROTO ((struct stmt_status *));
-void mark_emit_state PROTO ((struct emit_status *));
-void mark_varasm_state PROTO ((struct varasm_status *));
-void mark_optab PROTO ((void *));
+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_statistics PARAMS ((FILE *, ggc_statistics *));
+
+/* Print allocation statistics. */
+extern void ggc_page_print_statistics PARAMS ((void));
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