mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
237 lines
8.8 KiB
C
237 lines
8.8 KiB
C
/* Garbage collection for the GNU compiler.
|
|
Copyright (C) 1998, 1999, 2000, 2001 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 2, 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 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. */
|
|
extern void ggc_add_root PARAMS ((void *base, int nelt,
|
|
int size, void (*)(void *)));
|
|
extern void ggc_add_rtx_root PARAMS ((struct rtx_def **, int nelt));
|
|
extern void ggc_add_tree_root PARAMS ((union tree_node **,
|
|
int nelt));
|
|
extern void ggc_add_rtx_varray_root PARAMS ((struct varray_head_tag **,
|
|
int nelt));
|
|
extern void ggc_add_tree_varray_root PARAMS ((struct varray_head_tag **,
|
|
int nelt));
|
|
extern void ggc_add_tree_hash_table_root PARAMS ((struct hash_table **,
|
|
int nelt));
|
|
extern void ggc_del_root PARAMS ((void *base));
|
|
|
|
/* Types used for mark test and marking functions, if specified, in call
|
|
below. */
|
|
typedef int (*ggc_htab_marked_p) PARAMS ((const void *));
|
|
typedef void (*ggc_htab_mark) PARAMS ((const void *));
|
|
|
|
/* Add a hash table to be scanned when all roots have been processed. We
|
|
delete any entry in the table that has not been marked. The argument is
|
|
really htab_t. */
|
|
extern void ggc_add_deletable_htab PARAMS ((PTR, ggc_htab_marked_p,
|
|
ggc_htab_mark));
|
|
|
|
/* 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_nonnull_tree(EXPR) \
|
|
do { \
|
|
tree t__ = (EXPR); \
|
|
if (! ggc_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. */
|
|
extern void *ggc_alloc PARAMS ((size_t));
|
|
/* Like ggc_alloc, but allocates cleared memory. */
|
|
extern 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. */
|
|
extern 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. */
|
|
extern 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. */
|
|
extern int ggc_set_mark PARAMS ((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 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. */
|
|
extern 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. */
|
|
extern 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. */
|
|
extern void ggc_print_common_statistics PARAMS ((FILE *, ggc_statistics *));
|
|
|
|
/* Print allocation statistics. */
|
|
extern void ggc_print_statistics PARAMS ((void));
|
|
extern void stringpool_statistics PARAMS ((void));
|