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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2010. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#ifndef __ATOM_H__
#define __ATOM_H__
#ifndef __INDEX_H__
#include "index.h"
#endif
#include "erl_atom_table.h"
#define MAX_ATOM_LENGTH 255
#define ATOM_LIMIT (1024*1024)
#define MIN_ATOM_TABLE_SIZE 8192
#ifndef ARCH_32
/* Internal atom cache needs MAX_ATOM_TABLE_SIZE to be less than an
unsigned 32 bit integer. See external.c(erts_encode_ext_dist_header_setup)
for more details. */
#define MAX_ATOM_TABLE_SIZE ((MAX_ATOM_INDEX + 1 < (1UL << 32)) ? MAX_ATOM_INDEX + 1 : (1UL << 32))
#else
#define MAX_ATOM_TABLE_SIZE (MAX_ATOM_INDEX + 1)
#endif
/*
* Atom entry.
*/
typedef struct atom {
IndexSlot slot; /* MUST BE LOCATED AT TOP OF STRUCT!!! */
int len; /* length of atom name */
int ord0; /* ordinal value of first 3 bytes + 7 bits */
byte* name; /* name of atom */
} Atom;
extern IndexTable erts_atom_table;
ERTS_GLB_INLINE Atom* atom_tab(Uint i);
ERTS_GLB_INLINE int erts_is_atom_bytes(byte *text, size_t len, Eterm term);
ERTS_GLB_INLINE int erts_is_atom_str(char *str, Eterm term);
#if ERTS_GLB_INLINE_INCL_FUNC_DEF
ERTS_GLB_INLINE Atom*
atom_tab(Uint i)
{
return (Atom *) erts_index_lookup(&erts_atom_table, i);
}
ERTS_GLB_INLINE int erts_is_atom_bytes(byte *text, size_t len, Eterm term)
{
Atom *a;
if (!is_atom(term))
return 0;
a = atom_tab(atom_val(term));
return (len == (size_t) a->len
&& sys_memcmp((void *) a->name, (void *) text, len) == 0);
}
ERTS_GLB_INLINE int erts_is_atom_str(char *str, Eterm term)
{
Atom *a;
int i, len;
char *aname;
if (!is_atom(term))
return 0;
a = atom_tab(atom_val(term));
len = a->len;
aname = (char *) a->name;
for (i = 0; i < len; i++)
if (aname[i] != str[i] || str[i] == '\0')
return 0;
return str[len] == '\0';
}
#endif
/*
* Note, ERTS_IS_ATOM_STR() expects the first argument to be a
* string literal.
*/
#define ERTS_IS_ATOM_STR(LSTR, TERM) \
(erts_is_atom_bytes((byte *) LSTR, sizeof(LSTR) - 1, (TERM)))
#define ERTS_DECL_AM(S) Eterm AM_ ## S = am_atom_put(#S, sizeof(#S) - 1)
#define ERTS_INIT_AM(S) AM_ ## S = am_atom_put(#S, sizeof(#S) - 1)
int atom_table_size(void); /* number of elements */
int atom_table_sz(void); /* table size in bytes, excluding stored objects */
Eterm am_atom_put(const char*, int); /* most callers pass plain char*'s */
int atom_erase(byte*, int);
int atom_static_put(byte*, int);
void init_atom_table(void);
void atom_info(int, void *);
void dump_atoms(int, void *);
int erts_atom_get(const char* name, int len, Eterm* ap);
void erts_atom_get_text_space_sizes(Uint *reserved, Uint *used);
#endif
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