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-rw-r--r--libguile/instructions.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/libguile/instructions.c b/libguile/instructions.c
new file mode 100644
index 000000000..04180e5e3
--- /dev/null
+++ b/libguile/instructions.c
@@ -0,0 +1,218 @@
+/* Copyright (C) 2001, 2009 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_VM_NUM_INSTRUCTIONS * 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_VM_NUM_INSTRUCTIONS; i++)
+ {
+ table[i].opcode = i;
+ if (table[i].name)
+ table[i].symname =
+ scm_permanent_object (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_permanent_object
+ (scm_make_hash_table (SCM_I_MAKINUM (SCM_VM_NUM_INSTRUCTIONS)));
+ for (i = 0; i < SCM_VM_NUM_INSTRUCTIONS; i++)
+ if (scm_is_true (table[i].symname))
+ scm_hashq_set_x (instructions_by_name, table[i].symname,
+ SCM_I_MAKINUM (i));
+ }
+
+ 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;
+ int i;
+ struct scm_instruction *ip = fetch_instruction_table ();
+ for (i = 0; i < SCM_VM_NUM_INSTRUCTIONS; i++)
+ if (ip[i].name)
+ list = scm_cons (ip[i].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 >= 0 && opcode < SCM_VM_NUM_INSTRUCTIONS)
+ 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:
+*/