/* An expandable hash tables datatype.
- Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
Contributed by Vladimir Makarov (vmakarov@cygnus.com).
This program is free software; you can redistribute it and/or modify
extern "C" {
#endif /* __cplusplus */
-#include <ansidecl.h>
+#include "ansidecl.h"
+
+#ifndef GTY
+#define GTY(X)
+#endif
/* The type for a hash code. */
typedef unsigned int hashval_t;
htab_traverse. Return 1 to continue scan, 0 to stop. */
typedef int (*htab_trav) PARAMS ((void **, void *));
+/* Memory-allocation function, with the same functionality as calloc().
+ Iff it returns NULL, the hash table implementation will pass an error
+ code back to the user, so if your code doesn't handle errors,
+ best if you use xcalloc instead. */
+typedef PTR (*htab_alloc) PARAMS ((size_t, size_t));
+
+/* We also need a free() routine. */
+typedef void (*htab_free) PARAMS ((PTR));
+
+/* Memory allocation and deallocation; variants which take an extra
+ argument. */
+typedef PTR (*htab_alloc_with_arg) PARAMS ((void *, size_t, size_t));
+typedef void (*htab_free_with_arg) PARAMS ((void *, void *));
+
/* Hash tables are of the following type. The structure
(implementation) of this type is not needed for using the hash
tables. All work with hash table should be executed only through
- functions mentioned below. */
+ functions mentioned below. The size of this structure is subject to
+ change. */
-struct htab
+struct htab GTY(())
{
/* Pointer to hash function. */
htab_hash hash_f;
htab_del del_f;
/* Table itself. */
- PTR *entries;
+ PTR * GTY ((use_param (""), length ("%h.size"))) entries;
/* Current size (in entries) of the hash table */
size_t size;
of collisions fixed for time of work with the hash table. */
unsigned int collisions;
- /* This is non-zero if we are allowed to return NULL for function calls
- that allocate memory. */
- int return_allocation_failure;
+ /* Pointers to allocate/free functions. */
+ htab_alloc alloc_f;
+ htab_free free_f;
+
+ /* Alternate allocate/free functions, which take an extra argument. */
+ PTR GTY((skip (""))) alloc_arg;
+ htab_alloc_with_arg alloc_with_arg_f;
+ htab_free_with_arg free_with_arg_f;
};
typedef struct htab *htab_t;
/* The prototypes of the package functions. */
-extern htab_t htab_create PARAMS ((size_t, htab_hash,
- htab_eq, htab_del));
+extern htab_t htab_create_alloc PARAMS ((size_t, htab_hash,
+ htab_eq, htab_del,
+ htab_alloc, htab_free));
+
+extern htab_t htab_create_alloc_ex PARAMS ((size_t, htab_hash,
+ htab_eq, htab_del,
+ PTR, htab_alloc_with_arg,
+ htab_free_with_arg));
+
+/* Backward-compatibility functions. */
+extern htab_t htab_create PARAMS ((size_t, htab_hash, htab_eq, htab_del));
+extern htab_t htab_try_create PARAMS ((size_t, htab_hash, htab_eq, htab_del));
+
+extern void htab_set_functions_ex PARAMS ((htab_t, htab_hash,
+ htab_eq, htab_del,
+ PTR, htab_alloc_with_arg,
+ htab_free_with_arg));
-/* This function is like htab_create, but may return NULL if memory
- allocation fails, and also signals that htab_find_slot_with_hash and
- htab_find_slot are allowed to return NULL when inserting. */
-extern htab_t htab_try_create PARAMS ((size_t, htab_hash,
- htab_eq, htab_del));
extern void htab_delete PARAMS ((htab_t));
extern void htab_empty PARAMS ((htab_t));
extern void htab_remove_elt PARAMS ((htab_t, void *));
extern void htab_traverse PARAMS ((htab_t, htab_trav, void *));
+extern void htab_traverse_noresize PARAMS ((htab_t, htab_trav, void *));
extern size_t htab_size PARAMS ((htab_t));
extern size_t htab_elements PARAMS ((htab_t));
/* A hash function for null-terminated strings. */
extern hashval_t htab_hash_string PARAMS ((const PTR));
+/* An iterative hash function for arbitrary data. */
+extern hashval_t iterative_hash PARAMS ((const PTR, size_t, hashval_t));
+/* Shorthand for hashing something with an intrinsic size. */
+#define iterative_hash_object(OB,INIT) iterative_hash (&OB, sizeof (OB), INIT)
+
#ifdef __cplusplus
}
#endif /* __cplusplus */