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initial import

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Clifford Wolf 2013-01-05 11:13:26 +01:00
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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* ---
*
* A very simple and straightforward frontend for the RTLIL text
* representation (as generated by the 'ilang' backend).
*
*/
%{
#include "kernel/rtlil.h"
#include "parser.tab.h"
%}
%option yylineno
%option noyywrap
%option nounput
%option prefix="rtlil_frontend_ilang_yy"
%x STRING
%%
"module" { return TOK_MODULE; }
"attribute" { return TOK_ATTRIBUTE; }
"parameter" { return TOK_PARAMETER; }
"wire" { return TOK_WIRE; }
"memory" { return TOK_MEMORY; }
"auto" { return TOK_AUTO; }
"width" { return TOK_WIDTH; }
"offset" { return TOK_OFFSET; }
"size" { return TOK_SIZE; }
"input" { return TOK_INPUT; }
"output" { return TOK_OUTPUT; }
"inout" { return TOK_INOUT; }
"cell" { return TOK_CELL; }
"connect" { return TOK_CONNECT; }
"switch" { return TOK_SWITCH; }
"case" { return TOK_CASE; }
"assign" { return TOK_ASSIGN; }
"sync" { return TOK_SYNC; }
"low" { return TOK_LOW; }
"high" { return TOK_HIGH; }
"posedge" { return TOK_POSEDGE; }
"negedge" { return TOK_NEGEDGE; }
"edge" { return TOK_EDGE; }
"always" { return TOK_ALWAYS; }
"update" { return TOK_UPDATE; }
"process" { return TOK_PROCESS; }
"end" { return TOK_END; }
[a-z]+ { return TOK_INVALID; }
"\\"[^ \t\r\n]+ { rtlil_frontend_ilang_yylval.string = strdup(yytext); return TOK_ID; }
"$"[^ \t\r\n]+ { rtlil_frontend_ilang_yylval.string = strdup(yytext); return TOK_ID; }
"."[0-9]+ { rtlil_frontend_ilang_yylval.string = strdup(yytext); return TOK_ID; }
[0-9]+'[01xzm-]+ { rtlil_frontend_ilang_yylval.string = strdup(yytext); return TOK_VALUE; }
[0-9]+ { rtlil_frontend_ilang_yylval.integer = atoi(yytext); return TOK_INT; }
\" { BEGIN(STRING); }
<STRING>\\. { yymore(); }
<STRING>\" {
BEGIN(0);
char *yystr = strdup(yytext);
yystr[strlen(yytext) - 1] = 0;
int i = 0, j = 0;
while (yystr[i]) {
if (yystr[i] == '\\' && yystr[i + 1]) {
i++;
if (yystr[i] == 'n')
yystr[i] = '\n';
else if (yystr[i] == 't')
yystr[i] = '\t';
else if ('0' <= yystr[i] && yystr[i] <= '7') {
yystr[i] = yystr[i] - '0';
if ('0' <= yystr[i + 1] && yystr[i + 1] <= '7') {
yystr[i + 1] = yystr[i] * 8 + yystr[i + 1] - '0';
i++;
}
if ('0' <= yystr[i + 1] && yystr[i + 1] <= '7') {
yystr[i + 1] = yystr[i] * 8 + yystr[i + 1] - '0';
i++;
}
}
}
yystr[j++] = yystr[i++];
}
yystr[j] = 0;
rtlil_frontend_ilang_yylval.string = yystr;
return TOK_STRING;
}
<STRING>. { yymore(); }
"#"[^\n]*\n /* ignore comments */
[ \t] /* ignore non-newline whitespaces */
[\r\n]+ { return TOK_EOL; }
. { return *yytext; }
%%
// this is a hack to avoid the 'yyinput defined but not used' error msgs
void *rtlil_frontend_ilang_avoid_input_warnings() {
return (void*)&yyinput;
}