/* Garbage collection for the GNU compiler.
- Copyright (C) 1998 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999 Free Software Foundation, Inc.
This file is part of GNU CC.
/* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
an external gc library that might be linked in. */
+/* Language-specific code defines this variable to be either one (if
+ it wants garbage collection), or zero (if it does not). */
+extern int ggc_p;
+
/* 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 label_node;
struct eh_status;
struct emit_status;
+struct expr_status;
+struct hash_table;
+struct label_node;
+struct rtvec_def;
struct stmt_status;
+union tree_node;
struct varasm_status;
+struct varray_head_tag;
-/* Startup */
+/* Constants for general use. */
+extern char *empty_string;
+/* 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. These functions follow
+ pointers to mark other objects too. */
+extern void ggc_mark_rtvec PROTO ((struct rtvec_def *));
+extern void ggc_mark_tree_varray PROTO ((struct varray_head_tag *));
+extern void ggc_mark_tree_hash_table PROTO ((struct hash_table *));
+extern void ggc_mark_string PROTO ((char *));
+extern void ggc_mark PROTO ((void *));
+extern void ggc_mark_roots PROTO((void));
+
+extern void ggc_mark_rtx_children PROTO ((struct rtx_def *));
+extern void ggc_mark_tree_children PROTO ((union tree_node *));
+
+#define ggc_mark_rtx(RTX_EXPR) \
+ do { \
+ rtx r__ = (RTX_EXPR); \
+ if (r__ != NULL && ! ggc_set_mark_rtx (r__)) \
+ ggc_mark_rtx_children (r__); \
+ } while (0)
+
+#define ggc_mark_tree(TREE_EXPR) \
+ do { \
+ tree t__ = (TREE_EXPR); \
+ if (t__ != NULL && ! ggc_set_mark_tree (t__)) \
+ ggc_mark_tree_children (t__); \
+ } while (0)
+
+/* A GC implementation must provide these functions. */
+
+/* Initialize the garbage collector. */
extern void init_ggc PROTO ((void));
-/* Allocation. */
+/* 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));
+/* 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));
+
+/* 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));
/* 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 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_del_root PROTO ((void *base));
+/* Actually set the mark on a particular region of memory, but don't
+ follow pointers. These functions are called by ggc_mark_*. They
+ return zero if the object was not previously marked; they return
+ 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_rtx PROTO ((struct rtx_def *));
+int ggc_set_mark_rtvec PROTO ((struct rtvec_def *));
+int ggc_set_mark_tree PROTO ((union tree_node *));
-/* 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_string PROTO ((char *));
/* Callbacks to the languages. */
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 *));
-
/* The FALSE_LABEL_STACK, declared in except.h, has
language-dependent semantics. Each front-end should define this
function appropriately. */
/* 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_eh_status PROTO ((struct eh_status *));
+void mark_emit_status PROTO ((struct emit_status *));
+void mark_expr_status PROTO ((struct expr_status *));
+void mark_stmt_status PROTO ((struct stmt_status *));
+void mark_varasm_status PROTO ((struct varasm_status *));
void mark_optab PROTO ((void *));
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