1 files changed, 85 insertions, 0 deletions
diff --git a/gcc/hashtable.h b/gcc/hashtable.h
new file mode 100644
index 00000000000..5b08fde25b6
--- /dev/null
+++ b/gcc/hashtable.h
@@ -0,0 +1,85 @@
+/* Hash tables.
+   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+
+This program 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.
+
+This program 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 this program; if not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef GCC_HASHTABLE_H
+#define GCC_HASHTABLE_H
+
+#include "obstack.h"
+
+/* This is what each hash table entry points to.  It may be embedded
+   deeply within another object.  */
+typedef struct ht_identifier ht_identifier;
+struct ht_identifier
+{
+  unsigned int len;
+  const unsigned char *str;
+};
+
+#define HT_LEN(NODE) ((NODE)->len)
+#define HT_STR(NODE) ((NODE)->str)
+
+/* We want code outside cpplib, such as the compiler front-ends, to be
+   able to include this header, and to be able to link with
+   cpphashtbl.o without pulling in any other parts of cpplib.  */
+
+struct cpp_reader;
+typedef struct ht hash_table;
+typedef struct ht_identifier *hashnode;
+
+enum ht_lookup_option {HT_NO_INSERT = 0, HT_ALLOC, HT_ALLOCED};
+
+/* An identifier hash table for cpplib and the front ends.  */
+struct ht
+{
+  /* Identifiers are allocated from here.  */
+  struct obstack stack;
+
+  hashnode *entries;
+  /* Call back.  */
+  hashnode (*alloc_node) PARAMS ((hash_table *));
+
+  unsigned int nslots;		/* Total slots in the entries array.  */
+  unsigned int nelements;	/* Number of live elements.  */
+
+  /* Link to reader, if any.  For the benefit of cpplib.  */
+  struct cpp_reader *pfile;
+
+  /* Table usage statistics.  */
+  unsigned int searches;
+  unsigned int collisions;
+};
+
+extern void gcc_obstack_init PARAMS ((struct obstack *));
+/* Initialise the hashtable with 2 ^ order entries.  */
+extern hash_table *ht_create PARAMS ((unsigned int order));
+extern hashnode ht_lookup PARAMS ((hash_table *, const unsigned char *,
+				   unsigned int, enum ht_lookup_option));
+
+/* For all nodes in TABLE, make a callback.  The callback takes
+   TABLE->PFILE, the node, and a PTR, and the callback sequence stops
+   if the callback returns zero.  */
+typedef int (*ht_cb) PARAMS ((struct cpp_reader *, hashnode, const void *));
+extern void ht_forall PARAMS ((hash_table *, ht_cb, const void *));
+
+/* Dump allocation statistics to stderr.  */
+extern void ht_dump_statistics PARAMS ((hash_table *));
+
+/* Approximate positive square root of a host double.  This is for
+   statistical reports, not code generation.  */
+extern double approx_sqrt PARAMS ((double));
+
+#endif /* GCC_HASHTABLE_H */