mirror of
https://github.com/netwide-assembler/nasm.git
synced 2024-11-27 08:10:07 +08:00
487f352b62
As recommended by the community, a comma-separated decorators ({k1,z})
and nested braces ({{k1},{z}}) are dropped out. So only standard syntax
is supported from now.
This rework made source code neat and easy to maintain. Most of the codes
for handling corner cases are removed.
Signed-off-by: Jin Kyu Song <jin.kyu.song@intel.com>
341 lines
12 KiB
C
341 lines
12 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 1996-2009 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------- */
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#include "compiler.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include "nasm.h"
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#include "nasmlib.h"
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#include "quote.h"
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#include "stdscan.h"
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#include "insns.h"
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/*
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* Standard scanner routine used by parser.c and some output
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* formats. It keeps a succession of temporary-storage strings in
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* stdscan_tempstorage, which can be cleared using stdscan_reset.
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*/
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static char *stdscan_bufptr = NULL;
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static char **stdscan_tempstorage = NULL;
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static int stdscan_tempsize = 0, stdscan_templen = 0;
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#define STDSCAN_TEMP_DELTA 256
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void stdscan_set(char *str)
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{
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stdscan_bufptr = str;
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}
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char *stdscan_get(void)
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{
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return stdscan_bufptr;
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}
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static void stdscan_pop(void)
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{
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nasm_free(stdscan_tempstorage[--stdscan_templen]);
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}
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void stdscan_reset(void)
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{
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while (stdscan_templen > 0)
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stdscan_pop();
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}
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/*
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* Unimportant cleanup is done to avoid confusing people who are trying
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* to debug real memory leaks
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*/
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void stdscan_cleanup(void)
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{
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stdscan_reset();
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nasm_free(stdscan_tempstorage);
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}
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static char *stdscan_copy(char *p, int len)
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{
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char *text;
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text = nasm_malloc(len + 1);
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memcpy(text, p, len);
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text[len] = '\0';
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if (stdscan_templen >= stdscan_tempsize) {
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stdscan_tempsize += STDSCAN_TEMP_DELTA;
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stdscan_tempstorage = nasm_realloc(stdscan_tempstorage,
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stdscan_tempsize *
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sizeof(char *));
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}
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stdscan_tempstorage[stdscan_templen++] = text;
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return text;
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}
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/*
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* a token is enclosed with braces. proper token type will be assigned
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* accordingly with the token flag.
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*/
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static int stdscan_handle_brace(struct tokenval *tv)
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{
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if (!(tv->t_flag & TFLAG_BRC_ANY)) {
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/* invalid token is put inside braces */
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nasm_error(ERR_NONFATAL,
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"%s is not a valid decorator with braces", tv->t_charptr);
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tv->t_type = TOKEN_INVALID;
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} else if (tv->t_flag & TFLAG_BRC_OPT) {
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if (is_reg_class(OPMASKREG, tv->t_integer)) {
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/* within braces, opmask register is now used as a mask */
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tv->t_type = TOKEN_OPMASK;
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}
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}
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return tv->t_type;
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}
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int stdscan(void *private_data, struct tokenval *tv)
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{
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char ourcopy[MAX_KEYWORD + 1], *r, *s;
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(void)private_data; /* Don't warn that this parameter is unused */
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stdscan_bufptr = nasm_skip_spaces(stdscan_bufptr);
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if (!*stdscan_bufptr)
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return tv->t_type = TOKEN_EOS;
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/* we have a token; either an id, a number or a char */
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if (isidstart(*stdscan_bufptr) ||
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(*stdscan_bufptr == '$' && isidstart(stdscan_bufptr[1]))) {
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/* now we've got an identifier */
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bool is_sym = false;
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int token_type;
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if (*stdscan_bufptr == '$') {
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is_sym = true;
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stdscan_bufptr++;
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}
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r = stdscan_bufptr++;
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/* read the entire buffer to advance the buffer pointer but... */
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while (isidchar(*stdscan_bufptr))
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stdscan_bufptr++;
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/* ... copy only up to IDLEN_MAX-1 characters */
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tv->t_charptr = stdscan_copy(r, stdscan_bufptr - r < IDLEN_MAX ?
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stdscan_bufptr - r : IDLEN_MAX - 1);
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if (is_sym || stdscan_bufptr - r > MAX_KEYWORD)
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return tv->t_type = TOKEN_ID; /* bypass all other checks */
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for (s = tv->t_charptr, r = ourcopy; *s; s++)
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*r++ = nasm_tolower(*s);
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*r = '\0';
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/* right, so we have an identifier sitting in temp storage. now,
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* is it actually a register or instruction name, or what? */
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token_type = nasm_token_hash(ourcopy, tv);
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if (likely(!(tv->t_flag & TFLAG_BRC))) {
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/* most of the tokens fall into this case */
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return token_type;
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} else {
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return tv->t_type = TOKEN_ID;
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}
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} else if (*stdscan_bufptr == '$' && !isnumchar(stdscan_bufptr[1])) {
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/*
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* It's a $ sign with no following hex number; this must
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* mean it's a Here token ($), evaluating to the current
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* assembly location, or a Base token ($$), evaluating to
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* the base of the current segment.
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*/
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stdscan_bufptr++;
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if (*stdscan_bufptr == '$') {
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stdscan_bufptr++;
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return tv->t_type = TOKEN_BASE;
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}
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return tv->t_type = TOKEN_HERE;
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} else if (isnumstart(*stdscan_bufptr)) { /* now we've got a number */
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bool rn_error;
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bool is_hex = false;
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bool is_float = false;
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bool has_e = false;
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char c;
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r = stdscan_bufptr;
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if (*stdscan_bufptr == '$') {
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stdscan_bufptr++;
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is_hex = true;
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}
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for (;;) {
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c = *stdscan_bufptr++;
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if (!is_hex && (c == 'e' || c == 'E')) {
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has_e = true;
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if (*stdscan_bufptr == '+' || *stdscan_bufptr == '-') {
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/*
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* e can only be followed by +/- if it is either a
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* prefixed hex number or a floating-point number
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*/
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is_float = true;
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stdscan_bufptr++;
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}
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} else if (c == 'H' || c == 'h' || c == 'X' || c == 'x') {
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is_hex = true;
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} else if (c == 'P' || c == 'p') {
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is_float = true;
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if (*stdscan_bufptr == '+' || *stdscan_bufptr == '-')
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stdscan_bufptr++;
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} else if (isnumchar(c) || c == '_')
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; /* just advance */
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else if (c == '.')
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is_float = true;
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else
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break;
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}
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stdscan_bufptr--; /* Point to first character beyond number */
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if (has_e && !is_hex) {
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/* 1e13 is floating-point, but 1e13h is not */
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is_float = true;
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}
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if (is_float) {
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tv->t_charptr = stdscan_copy(r, stdscan_bufptr - r);
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return tv->t_type = TOKEN_FLOAT;
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} else {
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r = stdscan_copy(r, stdscan_bufptr - r);
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tv->t_integer = readnum(r, &rn_error);
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stdscan_pop();
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if (rn_error) {
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/* some malformation occurred */
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return tv->t_type = TOKEN_ERRNUM;
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}
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tv->t_charptr = NULL;
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return tv->t_type = TOKEN_NUM;
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}
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} else if (*stdscan_bufptr == '\'' || *stdscan_bufptr == '"' ||
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*stdscan_bufptr == '`') {
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/* a quoted string */
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char start_quote = *stdscan_bufptr;
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tv->t_charptr = stdscan_bufptr;
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tv->t_inttwo = nasm_unquote(tv->t_charptr, &stdscan_bufptr);
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if (*stdscan_bufptr != start_quote)
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return tv->t_type = TOKEN_ERRSTR;
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stdscan_bufptr++; /* Skip final quote */
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return tv->t_type = TOKEN_STR;
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} else if (*stdscan_bufptr == '{') {
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/* now we've got a decorator */
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int token_len;
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stdscan_bufptr = nasm_skip_spaces(stdscan_bufptr);
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r = ++stdscan_bufptr;
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/*
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* read the entire buffer to advance the buffer pointer
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* {rn-sae}, {rd-sae}, {ru-sae}, {rz-sae} contain '-' in tokens.
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*/
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while (isbrcchar(*stdscan_bufptr))
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stdscan_bufptr++;
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token_len = stdscan_bufptr - r;
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/* ... copy only up to DECOLEN_MAX-1 characters */
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tv->t_charptr = stdscan_copy(r, token_len < DECOLEN_MAX ?
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token_len : DECOLEN_MAX - 1);
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stdscan_bufptr = nasm_skip_spaces(stdscan_bufptr);
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/* if brace is not closed properly or token is too long */
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if ((*stdscan_bufptr != '}') || (token_len > MAX_KEYWORD)) {
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nasm_error(ERR_NONFATAL,
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"invalid decorator token inside braces");
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return tv->t_type = TOKEN_INVALID;
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}
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stdscan_bufptr++; /* skip closing brace */
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for (s = tv->t_charptr, r = ourcopy; *s; s++)
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*r++ = nasm_tolower(*s);
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*r = '\0';
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/* right, so we have a decorator sitting in temp storage. */
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nasm_token_hash(ourcopy, tv);
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/* handle tokens inside braces */
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return stdscan_handle_brace(tv);
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} else if (*stdscan_bufptr == ';') {
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/* a comment has happened - stay */
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return tv->t_type = TOKEN_EOS;
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} else if (stdscan_bufptr[0] == '>' && stdscan_bufptr[1] == '>') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_SHR;
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} else if (stdscan_bufptr[0] == '<' && stdscan_bufptr[1] == '<') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_SHL;
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} else if (stdscan_bufptr[0] == '/' && stdscan_bufptr[1] == '/') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_SDIV;
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} else if (stdscan_bufptr[0] == '%' && stdscan_bufptr[1] == '%') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_SMOD;
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} else if (stdscan_bufptr[0] == '=' && stdscan_bufptr[1] == '=') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_EQ;
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} else if (stdscan_bufptr[0] == '<' && stdscan_bufptr[1] == '>') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_NE;
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} else if (stdscan_bufptr[0] == '!' && stdscan_bufptr[1] == '=') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_NE;
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} else if (stdscan_bufptr[0] == '<' && stdscan_bufptr[1] == '=') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_LE;
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} else if (stdscan_bufptr[0] == '>' && stdscan_bufptr[1] == '=') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_GE;
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} else if (stdscan_bufptr[0] == '&' && stdscan_bufptr[1] == '&') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_DBL_AND;
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} else if (stdscan_bufptr[0] == '^' && stdscan_bufptr[1] == '^') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_DBL_XOR;
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} else if (stdscan_bufptr[0] == '|' && stdscan_bufptr[1] == '|') {
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stdscan_bufptr += 2;
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return tv->t_type = TOKEN_DBL_OR;
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} else /* just an ordinary char */
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return tv->t_type = (uint8_t)(*stdscan_bufptr++);
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}
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