245 lines
6.5 KiB
Plaintext
245 lines
6.5 KiB
Plaintext
%{
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/*
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* Lexical Analyzer for the Aic7xxx SCSI Host adapter sequencer assembler.
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*
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* Copyright (c) 1997 Justin T. Gibbs.
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* All rights reserved.
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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 conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: scan.l,v 1.1 1997/03/16 07:08:17 gibbs Exp $
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*/
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#include <sys/types.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <sysexits.h>
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#include <sys/queue.h>
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#include "aic7xxx_asm.h"
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#include "symbol.h"
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#include "y.tab.h"
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%}
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PATH [-/A-Za-z0-9_.]*[./][-/A-Za-z0-9_.]*
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WORD [A-Za-z_][-A-Za-z_0-9]*
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SPACE [ \t]+
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%x COMMENT
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%%
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\n { ++yylineno; }
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"/*" { BEGIN COMMENT; /* Enter comment eating state */ }
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<COMMENT>"/*" { fprintf(stderr, "Warning! Comment within comment."); }
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<COMMENT>\n { ++yylineno; }
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<COMMENT>[^*/\n]* ;
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<COMMENT>"*"+[^*/\n]* ;
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<COMMENT>"/"+[^*/\n]* ;
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<COMMENT>"*"+"/" { BEGIN INITIAL; }
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{SPACE} ;
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/* Register/SCB/SRAM definition keywords */
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register { return T_REGISTER; }
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const { yylval.value = FALSE; return T_CONST; }
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address { return T_ADDRESS; }
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access_mode { return T_ACCESS_MODE; }
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RW|RO|WO {
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if (strcmp(yytext, "RW") == 0)
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yylval.value = RW;
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else if (strcmp(yytext, "RO") == 0)
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yylval.value = RO;
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else
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yylval.value = WO;
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return T_MODE;
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}
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bit { return T_BIT; }
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mask { return T_MASK; }
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alias { return T_ALIAS; }
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size { return T_SIZE; }
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scb { return T_SCB; }
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scratch_ram { return T_SRAM; }
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accumulator { return T_ACCUM; }
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allones { return T_ALLONES; }
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allzeros { return T_ALLZEROS; }
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none { return T_NONE; }
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sindex { return T_SINDEX; }
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A { return T_A; }
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/* Opcodes */
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shl { return T_SHL; }
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shr { return T_SHR; }
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ror { return T_ROR; }
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rol { return T_ROL; }
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mvi { return T_MVI; }
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mov { return T_MOV; }
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clr { return T_CLR; }
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jmp { return T_JMP; }
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jc { return T_JC; }
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jnc { return T_JNC; }
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je { return T_JE; }
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jne { return T_JNE; }
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jz { return T_JZ; }
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jnz { return T_JNZ; }
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call { return T_CALL; }
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add { return T_ADD; }
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adc { return T_ADC; }
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inc { return T_INC; }
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dec { return T_DEC; }
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stc { return T_STC; }
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clc { return T_CLC; }
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cmp { return T_CMP; }
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xor { return T_XOR; }
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test { return T_TEST;}
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and { return T_AND; }
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or { return T_OR; }
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ret { return T_RET; }
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nop { return T_NOP; }
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.if { return T_IF; }
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.else { return T_ELSE; }
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.endif { return T_ENDIF; }
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/* Allowed Symbols */
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[-+,:()~|&."{};<>[\]!] { return yytext[0]; }
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/* Number processing */
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0[0-7]* {
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yylval.value = strtol(yytext, NULL, 8);
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return T_NUMBER;
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}
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0[xX][0-9a-fA-F]+ {
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yylval.value = strtoul(yytext + 2, NULL, 16);
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return T_NUMBER;
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}
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[1-9][0-9]* {
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yylval.value = strtol(yytext, NULL, 10);
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return T_NUMBER;
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}
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/* Include Files */
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#include { return T_INCLUDE; }
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/* For parsing C include files with #define foo */
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#define { yylval.value = TRUE; return T_CONST; }
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/* Throw away macros */
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#define[^\n]*[()]+[^\n]* ;
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{PATH} { yylval.str = strdup(yytext); return T_PATH; }
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{WORD} { yylval.sym = symtable_get(yytext); return T_SYMBOL; }
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. {
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char buf[255];
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snprintf(buf, sizeof(buf), "Invalid character "
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"'%c'", yytext[0]);
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stop(buf, EX_DATAERR);
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}
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%%
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typedef struct include {
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YY_BUFFER_STATE buffer;
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int lineno;
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char *filename;
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SLIST_ENTRY(include) links;
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}include_t;
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SLIST_HEAD(, include) include_stack;
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void
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include_file(file_name, type)
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char *file_name;
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include_type type;
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{
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FILE *newfile;
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include_t *include;
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newfile = NULL;
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/* Try the current directory first */
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if (includes_search_curdir != 0 || type == SOURCE_FILE)
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newfile = fopen(file_name, "r");
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if (newfile == NULL && type != SOURCE_FILE) {
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path_entry_t include_dir;
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for (include_dir = search_path.slh_first;
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include_dir != NULL;
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include_dir = include_dir->links.sle_next) {
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char fullname[PATH_MAX];
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if ((include_dir->quoted_includes_only == TRUE)
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&& (type != QUOTED_INCLUDE))
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continue;
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snprintf(fullname, sizeof(fullname),
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"%s/%s", include_dir->directory, file_name);
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if ((newfile = fopen(fullname, "r")) != NULL)
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break;
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}
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}
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if (newfile == NULL) {
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perror(file_name);
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stop("Unable to open input file", EX_SOFTWARE);
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/* NOTREACHED */
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}
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include = (include_t *)malloc(sizeof(include_t));
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if (include == NULL) {
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stop("Unable to allocate include stack entry", EX_SOFTWARE);
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/* NOTREACHED */
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}
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include->buffer = YY_CURRENT_BUFFER;
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include->lineno = yylineno;
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include->filename = yyfilename;
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SLIST_INSERT_HEAD(&include_stack, include, links);
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yy_switch_to_buffer(yy_create_buffer(newfile, YY_BUF_SIZE));
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yylineno = 1;
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yyfilename = strdup(file_name);
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}
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int
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yywrap()
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{
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include_t *include;
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yy_delete_buffer(YY_CURRENT_BUFFER);
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(void)fclose(yyin);
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if (yyfilename != NULL)
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free(yyfilename);
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include = include_stack.slh_first;
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if (include != NULL) {
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yy_switch_to_buffer(include->buffer);
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yylineno = include->lineno;
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yyfilename = include->filename;
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SLIST_REMOVE_HEAD(&include_stack, links);
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free(include);
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return (0);
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}
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return (1);
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}
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