313 lines
8.0 KiB
C
313 lines
8.0 KiB
C
/* CGEN generic opcode support.
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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 "config.h"
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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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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/* State variables.
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These record the state of the currently selected cpu, machine, endian, etc.
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They are set by cgen_set_cpu. */
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/* Current opcode data. */
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CGEN_OPCODE_DATA *cgen_current_opcode_data;
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/* Current machine (a la BFD machine number). */
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int cgen_current_mach;
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/* Current endian. */
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enum cgen_endian cgen_current_endian = CGEN_ENDIAN_UNKNOWN;
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void
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cgen_set_cpu (data, mach, endian)
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CGEN_OPCODE_DATA *data;
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int mach;
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enum cgen_endian endian;
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{
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cgen_current_opcode_data = data;
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cgen_current_mach = mach;
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cgen_current_endian = endian;
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#if 0 /* This isn't done here because it would put assembler support in the
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disassembler, etc. The caller is required to call these after calling
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us. */
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/* Reset the hash tables. */
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cgen_asm_init ();
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cgen_dis_init ();
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#endif
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}
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static unsigned int hash_keyword_name
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PARAMS ((const struct cgen_keyword *, const char *));
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static unsigned int hash_keyword_value
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PARAMS ((const struct cgen_keyword *, int));
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static void build_keyword_hash_tables
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PARAMS ((struct cgen_keyword *));
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/* Return number of hash table entries to use for N elements. */
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#define KEYWORD_HASH_SIZE(n) ((n) <= 31 ? 17 : 31)
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/* Look up *NAMEP in the keyword table KT.
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The result is the keyword entry or NULL if not found. */
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const struct cgen_keyword_entry *
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cgen_keyword_lookup_name (kt, name)
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struct cgen_keyword *kt;
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const char *name;
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{
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const struct cgen_keyword_entry *ke;
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const char *p,*n;
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if (kt->name_hash_table == NULL)
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build_keyword_hash_tables (kt);
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ke = kt->name_hash_table[hash_keyword_name (kt, name)];
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/* We do case insensitive comparisons.
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If that ever becomes a problem, add an attribute that denotes
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"do case sensitive comparisons". */
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while (ke != NULL)
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{
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n = name;
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p = ke->name;
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while (*p
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&& (*p == *n
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|| (isalpha (*p) && tolower (*p) == tolower (*n))))
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++n, ++p;
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if (!*p && !*n)
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return ke;
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ke = ke->next_name;
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}
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return NULL;
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}
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/* Look up VALUE in the keyword table KT.
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The result is the keyword entry or NULL if not found. */
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const struct cgen_keyword_entry *
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cgen_keyword_lookup_value (kt, value)
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struct cgen_keyword *kt;
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int value;
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{
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const struct cgen_keyword_entry *ke;
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if (kt->name_hash_table == NULL)
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build_keyword_hash_tables (kt);
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ke = kt->value_hash_table[hash_keyword_value (kt, value)];
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while (ke != NULL)
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{
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if (value == ke->value)
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return ke;
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ke = ke->next_value;
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}
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return NULL;
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}
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/* Add an entry to a keyword table. */
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void
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cgen_keyword_add (kt, ke)
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struct cgen_keyword *kt;
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struct cgen_keyword_entry *ke;
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{
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unsigned int hash;
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if (kt->name_hash_table == NULL)
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build_keyword_hash_tables (kt);
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hash = hash_keyword_name (kt, ke->name);
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ke->next_name = kt->name_hash_table[hash];
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kt->name_hash_table[hash] = ke;
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hash = hash_keyword_value (kt, ke->value);
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ke->next_value = kt->value_hash_table[hash];
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kt->value_hash_table[hash] = ke;
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}
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/* FIXME: Need function to return count of keywords. */
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/* Initialize a keyword table search.
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SPEC is a specification of what to search for.
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A value of NULL means to find every keyword.
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Currently NULL is the only acceptable value [further specification
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deferred].
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The result is an opaque data item used to record the search status.
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It is passed to each call to cgen_keyword_search_next. */
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struct cgen_keyword_search
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cgen_keyword_search_init (kt, spec)
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struct cgen_keyword *kt;
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const char *spec;
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{
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struct cgen_keyword_search search;
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/* FIXME: Need to specify format of PARAMS. */
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if (spec != NULL)
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abort ();
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if (kt->name_hash_table == NULL)
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build_keyword_hash_tables (kt);
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search.table = kt;
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search.spec = spec;
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search.current_hash = 0;
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search.current_entry = NULL;
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return search;
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}
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/* Return the next keyword specified by SEARCH.
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The result is the next entry or NULL if there are no more. */
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const struct cgen_keyword_entry *
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cgen_keyword_search_next (search)
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struct cgen_keyword_search *search;
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{
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const struct cgen_keyword_entry *ke;
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/* Has search finished? */
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if (search->current_hash == search->table->hash_table_size)
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return NULL;
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/* Search in progress? */
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if (search->current_entry != NULL
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/* Anything left on this hash chain? */
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&& search->current_entry->next_name != NULL)
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{
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search->current_entry = search->current_entry->next_name;
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return search->current_entry;
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}
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/* Move to next hash chain [unless we haven't started yet]. */
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if (search->current_entry != NULL)
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++search->current_hash;
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while (search->current_hash < search->table->hash_table_size)
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{
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search->current_entry = search->table->name_hash_table[search->current_hash];
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if (search->current_entry != NULL)
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return search->current_entry;
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++search->current_hash;
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}
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return NULL;
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}
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/* Return first entry in hash chain for NAME. */
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static unsigned int
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hash_keyword_name (kt, name)
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const struct cgen_keyword *kt;
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const char *name;
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{
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unsigned int hash;
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for (hash = 0; *name; ++name)
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hash = (hash * 97) + (unsigned char) *name;
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return hash % kt->hash_table_size;
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}
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/* Return first entry in hash chain for VALUE. */
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static unsigned int
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hash_keyword_value (kt, value)
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const struct cgen_keyword *kt;
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int value;
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{
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return value % kt->hash_table_size;
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}
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/* Build a keyword table's hash tables.
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We probably needn't build the value hash table for the assembler when
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we're using the disassembler, but we keep things simple. */
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static void
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build_keyword_hash_tables (kt)
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struct cgen_keyword *kt;
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{
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int i;
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/* Use the number of compiled in entries as an estimate for the
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typical sized table [not too many added at runtime]. */
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unsigned int size = KEYWORD_HASH_SIZE (kt->num_init_entries);
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kt->hash_table_size = size;
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kt->name_hash_table = (struct cgen_keyword_entry **)
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xmalloc (size * sizeof (struct cgen_keyword_entry *));
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memset (kt->name_hash_table, 0, size * sizeof (struct cgen_keyword_entry *));
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kt->value_hash_table = (struct cgen_keyword_entry **)
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xmalloc (size * sizeof (struct cgen_keyword_entry *));
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memset (kt->value_hash_table, 0, size * sizeof (struct cgen_keyword_entry *));
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/* The table is scanned backwards as we want keywords appearing earlier to
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be prefered over later ones. */
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for (i = kt->num_init_entries - 1; i >= 0; --i)
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cgen_keyword_add (kt, &kt->init_entries[i]);
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}
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/* Hardware support. */
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CGEN_HW_ENTRY *
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cgen_hw_lookup (name)
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const char *name;
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{
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CGEN_HW_ENTRY *hw = cgen_current_opcode_data->hw_list;
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while (hw != NULL)
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{
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if (strcmp (name, hw->name) == 0)
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return hw;
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hw = hw->next;
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}
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return NULL;
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}
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/* Instruction support. */
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/* Return number of instructions. This includes any added at runtime. */
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int
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cgen_insn_count ()
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{
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int count = cgen_current_opcode_data->insn_table->num_init_entries;
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CGEN_INSN_LIST *insn = cgen_current_opcode_data->insn_table->new_entries;
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for ( ; insn != NULL; insn = insn->next)
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++count;
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return count;
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}
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