path: root/erts/emulator/beam/export.h

/*
 * %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 __EXPORT_H__
#define __EXPORT_H__

#ifndef __SYS_H__
#include "sys.h"
#endif

#ifndef __INDEX_H__
#include "index.h"
#endif

#include "code_ix.h"

/*
** Export entry
*/

typedef struct export
{
    void* addressv[ERTS_NUM_CODE_IX];  /* Pointer to code for function. */
    struct binary* match_prog_set; /* Match program for tracing. */

    BeamInstr fake_op_func_info_for_hipe[2]; /* MUST be just before code[] */
    /*
     * code[0]: Tagged atom for module.
     * code[1]: Tagged atom for function.
     * code[2]: Arity (untagged integer).
     * code[3]: This entry is 0 unless the 'address' field points to it.
     *          Threaded code instruction to load function
     *		(em_call_error_handler), execute BIF (em_apply_bif,
     *		em_apply_apply), or call a traced function
     *		(em_call_traced_function).
     * code[4]: Function pointer to BIF function (for BIFs only)
     *		or pointer to threaded code if the module has an
     *		on_load function that has not been run yet.
     *		Otherwise: 0.
     */
    BeamInstr code[5];
} Export;


void init_export_table(void);
void export_info(int, void *);

ERTS_GLB_INLINE Export* erts_active_export_entry(Eterm m, Eterm f, unsigned a);
Export* erts_export_put(Eterm mod, Eterm func, unsigned int arity);

Export* erts_export_get_or_make_stub(Eterm, Eterm, unsigned);

Export *export_list(int,ErtsCodeIndex);
int export_list_size(ErtsCodeIndex);
int export_table_sz(void);
int export_entries_sz(void);
Export *export_get(Export*);
void export_start_staging(void);
void export_end_staging(int commit);

extern erts_smp_rwmtx_t export_staging_lock;
#define export_write_lock()	erts_smp_rwmtx_rwlock(&export_staging_lock)
#define export_write_unlock()	erts_smp_rwmtx_rwunlock(&export_staging_lock)

#include "beam_load.h" /* For em_* extern declarations */ 
#define ExportIsBuiltIn(EntryPtr) 			\
(((EntryPtr)->addressv[erts_active_code_ix()] == (EntryPtr)->code + 3) && \
 ((EntryPtr)->code[3] == (BeamInstr) em_apply_bif))

#if ERTS_GLB_INLINE_INCL_FUNC_DEF

ERTS_GLB_INLINE Export*
erts_active_export_entry(Eterm m, Eterm f, unsigned int a)
{
    extern Export* erts_find_export_entry(Eterm m, Eterm f, unsigned a, ErtsCodeIndex);
    return erts_find_export_entry(m, f, a, erts_active_code_ix());
}

#endif /* ERTS_GLB_INLINE_INCL_FUNC_DEF */

#endif /* __EXPORT_H__ */