292 lines
7.4 KiB
C
292 lines
7.4 KiB
C
/* CGEN generic assembler support code.
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU Binutils and GDB, the GNU debugger.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "sysdep.h"
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#include <stdio.h>
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#include "ansidecl.h"
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#include "libiberty.h"
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#include "bfd.h"
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#include "opcode/cgen.h"
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/* Operand parsing callback. */
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const char * (*cgen_parse_operand_fn)
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PARAMS ((enum cgen_parse_operand_type, const char **, int, int,
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enum cgen_parse_operand_result *, bfd_vma *));
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/* This is not published as part of the public interface so we don't
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declare this in cgen.h. */
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extern CGEN_OPCODE_DATA *cgen_current_opcode_data;
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/* Assembler instruction hash table. */
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static CGEN_INSN_LIST **asm_hash_table;
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/* Called once at startup and whenever machine/endian change. */
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void
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cgen_asm_init ()
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{
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if (asm_hash_table)
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{
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free (asm_hash_table);
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asm_hash_table = NULL;
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}
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}
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/* Called whenever starting to parse an insn. */
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void
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cgen_init_parse_operand ()
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{
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/* This tells the callback to re-initialize. */
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(void) (*cgen_parse_operand_fn) (CGEN_PARSE_OPERAND_INIT, NULL, 0, 0,
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NULL, NULL);
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}
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/* Build the assembler instruction hash table. */
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static void
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build_asm_hash_table ()
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{
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int i;
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unsigned int hash;
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int count = cgen_insn_count ();
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CGEN_OPCODE_DATA *data = cgen_current_opcode_data;
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CGEN_INSN_TABLE *insn_table = data->insn_table;
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unsigned int hash_size = insn_table->asm_hash_table_size;
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const CGEN_INSN *insn;
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CGEN_INSN_LIST *insn_lists,*new_insns;
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/* The space allocated for the hash table consists of two parts:
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the hash table and the hash lists. */
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asm_hash_table = (CGEN_INSN_LIST **)
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xmalloc (hash_size * sizeof (CGEN_INSN_LIST *)
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+ count * sizeof (CGEN_INSN_LIST));
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memset (asm_hash_table, 0,
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hash_size * sizeof (CGEN_INSN_LIST *)
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+ count * sizeof (CGEN_INSN_LIST));
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insn_lists = (CGEN_INSN_LIST *) (asm_hash_table + hash_size);
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/* Add compiled in insns.
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The table is scanned backwards as later additions are inserted in
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front of earlier ones and we want earlier ones to be prefered.
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We stop at the first one as it is a reserved entry. */
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for (insn = insn_table->init_entries + insn_table->num_init_entries - 1;
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insn > insn_table->init_entries;
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--insn, ++insn_lists)
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{
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hash = (*insn_table->asm_hash) (insn->syntax.mnemonic);
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insn_lists->next = asm_hash_table[hash];
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insn_lists->insn = insn;
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asm_hash_table[hash] = insn_lists;
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}
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/* Add runtime added insns.
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??? Currently later added insns will be prefered over earlier ones.
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Not sure this is a bug or not. */
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for (new_insns = insn_table->new_entries;
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new_insns != NULL;
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new_insns = new_insns->next, ++insn_lists)
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{
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hash = (*insn_table->asm_hash) (new_insns->insn->syntax.mnemonic);
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insn_lists->next = asm_hash_table[hash];
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insn_lists->insn = new_insns->insn;
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asm_hash_table[hash] = insn_lists;
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}
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}
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/* Return the first entry in the hash list for INSN. */
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CGEN_INSN_LIST *
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cgen_asm_lookup_insn (insn)
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const char *insn;
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{
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unsigned int hash;
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if (asm_hash_table == NULL)
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build_asm_hash_table ();
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hash = (*cgen_current_opcode_data->insn_table->asm_hash) (insn);
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return asm_hash_table[hash];
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}
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/* Keyword parser.
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The result is NULL upon success or an error message.
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If successful, *STRP is updated to point passed the keyword.
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??? At present we have a static notion of how to pick out a keyword.
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Later we can allow a target to customize this if necessary [say by
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recording something in the keyword table]. */
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const char *
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cgen_parse_keyword (strp, keyword_table, valuep)
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const char **strp;
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struct cgen_keyword *keyword_table;
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long *valuep;
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{
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const struct cgen_keyword_entry *ke;
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char buf[256];
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const char *p;
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p = *strp;
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/* Allow any first character. */
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if (*p)
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++p;
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/* Now allow letters, digits, and _. */
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while (isalnum (*p) || *p == '_')
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++p;
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if (p - *strp > 255)
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return "unrecognized keyword/register name";
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memcpy (buf, *strp, p - *strp);
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buf[p - *strp] = 0;
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ke = cgen_keyword_lookup_name (keyword_table, buf);
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if (ke != NULL)
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{
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*valuep = ke->value;
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*strp = p;
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return NULL;
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}
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return "unrecognized keyword/register name";
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}
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/* Signed integer parser. */
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const char *
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cgen_parse_signed_integer (strp, opindex, min, max, valuep)
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const char **strp;
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int opindex;
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long min, max;
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long *valuep;
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{
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long value;
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enum cgen_parse_operand_result result;
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const char *errmsg;
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errmsg = (*cgen_parse_operand_fn) (CGEN_PARSE_OPERAND_INTEGER, strp,
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opindex, BFD_RELOC_NONE,
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&result, &value);
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/* FIXME: Examine `result'. */
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if (!errmsg)
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{
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if (value < min || value > max)
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return "integer operand out of range";
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*valuep = value;
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}
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return errmsg;
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}
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/* Unsigned integer parser. */
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const char *
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cgen_parse_unsigned_integer (strp, opindex, min, max, valuep)
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const char **strp;
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int opindex;
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unsigned long min, max;
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unsigned long *valuep;
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{
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unsigned long value;
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enum cgen_parse_operand_result result;
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const char *errmsg;
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errmsg = (*cgen_parse_operand_fn) (CGEN_PARSE_OPERAND_INTEGER, strp,
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opindex, BFD_RELOC_NONE,
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&result, &value);
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/* FIXME: Examine `result'. */
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if (!errmsg)
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{
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if (value < min || value > max)
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return "integer operand out of range";
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*valuep = value;
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}
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return errmsg;
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}
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/* Address parser. */
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const char *
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cgen_parse_address (strp, opindex, opinfo, valuep)
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const char **strp;
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int opindex;
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int opinfo;
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long *valuep;
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{
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long value;
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enum cgen_parse_operand_result result;
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const char *errmsg;
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errmsg = (*cgen_parse_operand_fn) (CGEN_PARSE_OPERAND_ADDRESS, strp,
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opindex, opinfo,
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&result, &value);
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/* FIXME: Examine `result'. */
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if (!errmsg)
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{
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*valuep = value;
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}
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return errmsg;
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}
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/* Signed integer validation routine. */
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const char *
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cgen_validate_signed_integer (value, min, max)
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long value, min, max;
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{
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if (value < min || value > max)
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{
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const char *err =
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"operand out of range (%ld not between %ld and %ld)";
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static char buf[100];
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sprintf (buf, err, value, min, max);
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return buf;
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}
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return NULL;
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}
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/* Unsigned integer validation routine.
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Supplying `min' here may seem unnecessary, but we also want to handle
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cases where min != 0 (and max > LONG_MAX). */
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const char *
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cgen_validate_unsigned_integer (value, min, max)
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unsigned long value, min, max;
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{
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if (value < min || value > max)
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{
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const char *err =
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"operand out of range (%lu not between %lu and %lu)";
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static char buf[100];
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sprintf (buf, err, value, min, max);
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return buf;
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}
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return NULL;
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}
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