mirror of https://github.com/YosysHQ/yosys.git
132 lines
3.7 KiB
Plaintext
132 lines
3.7 KiB
Plaintext
/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* ---
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*
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* A very simple and straightforward frontend for the RTLIL text
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* representation (as generated by the 'ilang' backend).
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*
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*/
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%{
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#ifdef __clang__
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// bison generates code using the 'register' storage class specifier
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#pragma clang diagnostic ignored "-Wdeprecated-register"
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#endif
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#include "kernel/rtlil.h"
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#include "parser.tab.h"
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%}
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%option yylineno
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%option noyywrap
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%option nounput
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%option prefix="rtlil_frontend_ilang_yy"
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%x STRING
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%%
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"autoidx" { return TOK_AUTOIDX; }
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"module" { return TOK_MODULE; }
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"attribute" { return TOK_ATTRIBUTE; }
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"parameter" { return TOK_PARAMETER; }
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"signed" { return TOK_SIGNED; }
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"wire" { return TOK_WIRE; }
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"memory" { return TOK_MEMORY; }
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"width" { return TOK_WIDTH; }
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"offset" { return TOK_OFFSET; }
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"size" { return TOK_SIZE; }
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"input" { return TOK_INPUT; }
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"output" { return TOK_OUTPUT; }
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"inout" { return TOK_INOUT; }
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"cell" { return TOK_CELL; }
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"connect" { return TOK_CONNECT; }
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"switch" { return TOK_SWITCH; }
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"case" { return TOK_CASE; }
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"assign" { return TOK_ASSIGN; }
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"sync" { return TOK_SYNC; }
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"low" { return TOK_LOW; }
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"high" { return TOK_HIGH; }
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"posedge" { return TOK_POSEDGE; }
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"negedge" { return TOK_NEGEDGE; }
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"edge" { return TOK_EDGE; }
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"always" { return TOK_ALWAYS; }
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"init" { return TOK_INIT; }
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"update" { return TOK_UPDATE; }
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"process" { return TOK_PROCESS; }
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"end" { return TOK_END; }
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[a-z]+ { return TOK_INVALID; }
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"\\"[^ \t\r\n]+ { rtlil_frontend_ilang_yylval.string = strdup(yytext); return TOK_ID; }
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"$"[^ \t\r\n]+ { rtlil_frontend_ilang_yylval.string = strdup(yytext); return TOK_ID; }
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"."[0-9]+ { rtlil_frontend_ilang_yylval.string = strdup(yytext); return TOK_ID; }
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[0-9]+'[01xzm-]* { rtlil_frontend_ilang_yylval.string = strdup(yytext); return TOK_VALUE; }
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-?[0-9]+ { rtlil_frontend_ilang_yylval.integer = atoi(yytext); return TOK_INT; }
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\" { BEGIN(STRING); }
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<STRING>\\. { yymore(); }
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<STRING>\" {
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BEGIN(0);
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char *yystr = strdup(yytext);
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yystr[strlen(yytext) - 1] = 0;
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int i = 0, j = 0;
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while (yystr[i]) {
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if (yystr[i] == '\\' && yystr[i + 1]) {
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i++;
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if (yystr[i] == 'n')
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yystr[i] = '\n';
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else if (yystr[i] == 't')
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yystr[i] = '\t';
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else if ('0' <= yystr[i] && yystr[i] <= '7') {
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yystr[i] = yystr[i] - '0';
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if ('0' <= yystr[i + 1] && yystr[i + 1] <= '7') {
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yystr[i + 1] = yystr[i] * 8 + yystr[i + 1] - '0';
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i++;
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}
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if ('0' <= yystr[i + 1] && yystr[i + 1] <= '7') {
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yystr[i + 1] = yystr[i] * 8 + yystr[i + 1] - '0';
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i++;
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}
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}
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}
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yystr[j++] = yystr[i++];
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}
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yystr[j] = 0;
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rtlil_frontend_ilang_yylval.string = yystr;
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return TOK_STRING;
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}
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<STRING>. { yymore(); }
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"#"[^\n]* /* ignore comments */
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[ \t] /* ignore non-newline whitespaces */
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[\r\n]+ { return TOK_EOL; }
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. { return *yytext; }
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%%
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// this is a hack to avoid the 'yyinput defined but not used' error msgs
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void *rtlil_frontend_ilang_avoid_input_warnings() {
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return (void*)&yyinput;
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}
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