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/* Copyright (C) 2001 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include "_scm.h"
#include "vm-bootstrap.h"
#include "instructions.h"
struct scm_instruction {
enum scm_opcode opcode; /* opcode */
const char *name; /* instruction name */
signed char len; /* Instruction length. This may be -1 for
the loader (see the `VM_LOADER'
macro). */
signed char npop; /* The number of values popped. This may be
-1 for insns like `call' which can take
any number of arguments. */
char npush; /* the number of values pushed */
SCM symname; /* filled in later */
};
#define SCM_VALIDATE_LOOKUP_INSTRUCTION(pos, var, cvar) \
do { \
cvar = scm_lookup_instruction_by_name (var); \
SCM_ASSERT_TYPE (cvar, var, pos, FUNC_NAME, "INSTRUCTION_P"); \
} while (0)
static struct scm_instruction*
fetch_instruction_table ()
{
static struct scm_instruction *table = NULL;
if (SCM_UNLIKELY (!table))
{
size_t bytes = scm_op_last * sizeof(struct scm_instruction);
int i;
table = malloc (bytes);
memset (table, 0, bytes);
#define VM_INSTRUCTION_TO_TABLE 1
#include <libguile/vm-expand.h>
#include <libguile/vm-i-system.i>
#include <libguile/vm-i-scheme.i>
#include <libguile/vm-i-loader.i>
#undef VM_INSTRUCTION_TO_TABLE
for (i = 0; i < scm_op_last; i++)
{
table[i].opcode = i;
if (table[i].name)
table[i].symname = scm_from_locale_symbol (table[i].name);
else
table[i].symname = SCM_BOOL_F;
}
}
return table;
}
static struct scm_instruction *
scm_lookup_instruction_by_name (SCM name)
{
static SCM instructions_by_name = SCM_BOOL_F;
struct scm_instruction *table = fetch_instruction_table ();
SCM op;
if (SCM_UNLIKELY (SCM_FALSEP (instructions_by_name)))
{
int i;
instructions_by_name = scm_make_hash_table (SCM_I_MAKINUM (scm_op_last));
for (i = 0; i < scm_op_last; i++)
if (scm_is_true (table[i].symname))
scm_hashq_set_x (instructions_by_name, table[i].symname,
SCM_I_MAKINUM (i));
instructions_by_name = scm_permanent_object (instructions_by_name);
}
op = scm_hashq_ref (instructions_by_name, name, SCM_UNDEFINED);
if (SCM_I_INUMP (op))
return &table[SCM_I_INUM (op)];
return NULL;
}
/* Scheme interface */
SCM_DEFINE (scm_instruction_list, "instruction-list", 0, 0, 0,
(void),
"")
#define FUNC_NAME s_scm_instruction_list
{
SCM list = SCM_EOL;
struct scm_instruction *ip;
for (ip = fetch_instruction_table (); ip->opcode != scm_op_last; ip++)
if (ip->name)
list = scm_cons (ip->symname, list);
return scm_reverse_x (list, SCM_EOL);
}
#undef FUNC_NAME
SCM_DEFINE (scm_instruction_p, "instruction?", 1, 0, 0,
(SCM obj),
"")
#define FUNC_NAME s_scm_instruction_p
{
return SCM_BOOL (scm_lookup_instruction_by_name (obj));
}
#undef FUNC_NAME
SCM_DEFINE (scm_instruction_length, "instruction-length", 1, 0, 0,
(SCM inst),
"")
#define FUNC_NAME s_scm_instruction_length
{
struct scm_instruction *ip;
SCM_VALIDATE_LOOKUP_INSTRUCTION (1, inst, ip);
return SCM_I_MAKINUM (ip->len);
}
#undef FUNC_NAME
SCM_DEFINE (scm_instruction_pops, "instruction-pops", 1, 0, 0,
(SCM inst),
"")
#define FUNC_NAME s_scm_instruction_pops
{
struct scm_instruction *ip;
SCM_VALIDATE_LOOKUP_INSTRUCTION (1, inst, ip);
return SCM_I_MAKINUM (ip->npop);
}
#undef FUNC_NAME
SCM_DEFINE (scm_instruction_pushes, "instruction-pushes", 1, 0, 0,
(SCM inst),
"")
#define FUNC_NAME s_scm_instruction_pushes
{
struct scm_instruction *ip;
SCM_VALIDATE_LOOKUP_INSTRUCTION (1, inst, ip);
return SCM_I_MAKINUM (ip->npush);
}
#undef FUNC_NAME
SCM_DEFINE (scm_instruction_to_opcode, "instruction->opcode", 1, 0, 0,
(SCM inst),
"")
#define FUNC_NAME s_scm_instruction_to_opcode
{
struct scm_instruction *ip;
SCM_VALIDATE_LOOKUP_INSTRUCTION (1, inst, ip);
return SCM_I_MAKINUM (ip->opcode);
}
#undef FUNC_NAME
SCM_DEFINE (scm_opcode_to_instruction, "opcode->instruction", 1, 0, 0,
(SCM op),
"")
#define FUNC_NAME s_scm_opcode_to_instruction
{
int opcode;
SCM ret = SCM_BOOL_F;
SCM_MAKE_VALIDATE (1, op, I_INUMP);
opcode = SCM_I_INUM (op);
if (opcode < scm_op_last)
ret = fetch_instruction_table ()[opcode].symname;
if (scm_is_false (ret))
scm_wrong_type_arg_msg (FUNC_NAME, 1, op, "INSTRUCTION_P");
return ret;
}
#undef FUNC_NAME
void
scm_bootstrap_instructions (void)
{
scm_c_register_extension ("libguile", "scm_init_instructions",
(scm_t_extension_init_func)scm_init_instructions,
NULL);
}
void
scm_init_instructions (void)
{
scm_bootstrap_vm ();
#ifndef SCM_MAGIC_SNARFER
#include "libguile/instructions.x"
#endif
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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