/* String pool for GCC.
- Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005
+ Free Software Foundation, Inc.
This file is part of GCC.
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
-/* String text, identifer text and identifier node allocator. Strings
+/* String text, identifier text and identifier node allocator. Strings
allocated by ggc_alloc_string are stored in an obstack which is
never shrunk. Identifiers are uniquely stored in a hash table.
- We have our own private hash table implementation. libiberty's
+ We use cpplib's hash table implementation. libiberty's
hashtab.c is not used because it requires 100% average space
overhead per string, which is unacceptable. Also, this algorithm
is faster. */
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "ggc.h"
#include "tree.h"
-#include "hashtable.h"
-#include "toplev.h"
+#include "symtab.h"
+#include "cpplib.h"
/* The "" allocated string. */
const char empty_string[] = "";
struct ht *ident_hash;
static struct obstack string_stack;
-static hashnode alloc_node PARAMS ((hash_table *));
-static int mark_ident PARAMS ((struct cpp_reader *, hashnode, const PTR));
-static void mark_ident_hash PARAMS ((void *));
+static hashnode alloc_node (hash_table *);
+static int mark_ident (struct cpp_reader *, hashnode, const void *);
+
+static void *
+stringpool_ggc_alloc (size_t x)
+{
+ return ggc_alloc (x);
+}
/* Initialize the string pool. */
void
-init_stringpool ()
+init_stringpool (void)
{
/* Create with 16K (2^14) entries. */
ident_hash = ht_create (14);
ident_hash->alloc_node = alloc_node;
+ ident_hash->alloc_subobject = stringpool_ggc_alloc;
gcc_obstack_init (&string_stack);
- ggc_add_root (&ident_hash, 1, sizeof ident_hash, mark_ident_hash);
}
/* Allocate a hash node. */
static hashnode
-alloc_node (table)
- hash_table *table ATTRIBUTE_UNUSED;
+alloc_node (hash_table *table ATTRIBUTE_UNUSED)
{
return GCC_IDENT_TO_HT_IDENT (make_node (IDENTIFIER_NODE));
}
returned this time too. */
const char *
-ggc_alloc_string (contents, length)
- const char *contents;
- int length;
+ggc_alloc_string (const char *contents, int length)
{
if (length == -1)
length = strlen (contents);
if (length == 0)
return empty_string;
- if (length == 1 && contents[0] >= '0' && contents[0] <= '9')
+ if (length == 1 && ISDIGIT (contents[0]))
return digit_string (contents[0] - '0');
obstack_grow0 (&string_stack, contents, length);
If an identifier with that name has previously been referred to,
the same node is returned this time. */
+#undef get_identifier
+
tree
-get_identifier (text)
- const char *text;
+get_identifier (const char *text)
{
hashnode ht_node = ht_lookup (ident_hash,
(const unsigned char *) text,
return HT_IDENT_TO_GCC_IDENT (ht_node);
}
+/* Identical to get_identifier, except that the length is assumed
+ known. */
+
+tree
+get_identifier_with_length (const char *text, size_t length)
+{
+ hashnode ht_node = ht_lookup (ident_hash,
+ (const unsigned char *) text,
+ length, HT_ALLOC);
+
+ /* ht_node can't be NULL here. */
+ return HT_IDENT_TO_GCC_IDENT (ht_node);
+}
+
/* If an identifier with the name TEXT (a null-terminated string) has
previously been referred to, return that node; otherwise return
NULL_TREE. */
tree
-maybe_get_identifier (text)
- const char *text;
+maybe_get_identifier (const char *text)
{
hashnode ht_node;
return NULL_TREE;
}
-/* Record the size of an identifier node for the language in use.
- SIZE is the total size in bytes.
- This is called by the language-specific files. This must be
- called before allocating any identifiers. */
-
-void
-set_identifier_size (size)
- int size;
-{
- tree_code_length[(int) IDENTIFIER_NODE]
- = (size - sizeof (struct tree_common)) / sizeof (tree);
-}
-
/* Report some basic statistics about the string pool. */
void
-stringpool_statistics ()
+stringpool_statistics (void)
{
ht_dump_statistics (ident_hash);
}
-
+\f
/* Mark an identifier for GC. */
static int
-mark_ident (pfile, h, v)
- struct cpp_reader *pfile ATTRIBUTE_UNUSED;
- hashnode h;
- const PTR v ATTRIBUTE_UNUSED;
+mark_ident (struct cpp_reader *pfile ATTRIBUTE_UNUSED, hashnode h,
+ const void *v ATTRIBUTE_UNUSED)
{
- ggc_mark_nonnull_tree (HT_IDENT_TO_GCC_IDENT (h));
+ gt_ggc_m_9tree_node (HT_IDENT_TO_GCC_IDENT (h));
return 1;
}
-/* Mark all identifiers for GC. */
+/* Mark the trees hanging off the identifier node for GGC. These are
+ handled specially (not using gengtype) because of the special
+ treatment for strings. */
-static void
-mark_ident_hash (arg)
- PTR arg ATTRIBUTE_UNUSED;
+void
+ggc_mark_stringpool (void)
{
ht_forall (ident_hash, mark_ident, NULL);
}
+
+/* Strings are _not_ GCed, but this routine exists so that a separate
+ roots table isn't needed for the few global variables that refer
+ to strings. */
+
+void
+gt_ggc_m_S (void *x ATTRIBUTE_UNUSED)
+{
+}
+
+/* Pointer-walking routine for strings (not very interesting, since
+ strings don't contain pointers). */
+
+void
+gt_pch_p_S (void *obj ATTRIBUTE_UNUSED, void *x ATTRIBUTE_UNUSED,
+ gt_pointer_operator op ATTRIBUTE_UNUSED,
+ void *cookie ATTRIBUTE_UNUSED)
+{
+}
+
+/* PCH pointer-walking routine for strings. */
+
+void
+gt_pch_n_S (const void *x)
+{
+ gt_pch_note_object ((void *)x, (void *)x, >_pch_p_S,
+ gt_types_enum_last);
+}
+\f
+/* Handle saving and restoring the string pool for PCH. */
+
+/* SPD is saved in the PCH file and holds the information needed
+ to restore the string pool. */
+
+struct string_pool_data GTY(())
+{
+ struct ht_identifier * *
+ GTY((length ("%h.nslots"),
+ nested_ptr (union tree_node, "%h ? GCC_IDENT_TO_HT_IDENT (%h) : NULL",
+ "%h ? HT_IDENT_TO_GCC_IDENT (%h) : NULL")))
+ entries;
+ unsigned int nslots;
+ unsigned int nelements;
+};
+
+static GTY(()) struct string_pool_data * spd;
+
+/* Save the stringpool data in SPD. */
+
+void
+gt_pch_save_stringpool (void)
+{
+ spd = ggc_alloc (sizeof (*spd));
+ spd->nslots = ident_hash->nslots;
+ spd->nelements = ident_hash->nelements;
+ spd->entries = ggc_alloc (sizeof (spd->entries[0]) * spd->nslots);
+ memcpy (spd->entries, ident_hash->entries,
+ spd->nslots * sizeof (spd->entries[0]));
+}
+
+/* Return the stringpool to its state before gt_pch_save_stringpool
+ was called. */
+
+void
+gt_pch_fixup_stringpool (void)
+{
+}
+
+/* A PCH file has been restored, which loaded SPD; fill the real hash table
+ from SPD. */
+
+void
+gt_pch_restore_stringpool (void)
+{
+ ht_load (ident_hash, spd->entries, spd->nslots, spd->nelements, false);
+ spd = NULL;
+}
+
+#include "gt-stringpool.h"
OSDN Git Service
