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Value of properties can be expression. 

Example found in the 2007.03 Liberty Reference Manual that was also found
in the wild:

    input_voltage(CMOS) {
        vil : 0.3 * VDD ;
        vih : 0.7 * VDD ;
        vimin : -0.5 ;
        vimax : VDD + 0.5 ;
    }

Current implementation just parses the expression but no interpretation is done.
This commit is contained in:
Staf Verhaegen 2018-01-03 20:36:22 +00:00
parent 9804ebedbf
commit 92eb841f0a
1 changed files with 22 additions and 2 deletions
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24
passes/techmap/libparse.cc
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@ -100,8 +100,15 @@ int LibertyParser::lexer(std::string &str)
break;
}
f.unget();
// fprintf(stderr, "LEX: identifier >>%s<<\n", str.c_str());
return 'v';
if (str == "+" || str == "-") {
/* Single operator is not an identifier */
// fprintf(stderr, "LEX: char >>%s<<\n", str.c_str());
return str[0];
}
else {
// fprintf(stderr, "LEX: identifier >>%s<<\n", str.c_str());
return 'v';
}
}
if (c == '"') {
@ -191,6 +198,19 @@ LibertyAst *LibertyParser::parse()
tok = lexer(ast->value);
if (tok != 'v')
error();
tok = lexer(str);
while (tok == '+' || tok == '-' || tok == '*' || tok == '/') {
ast->value += tok;
tok = lexer(str);
if (tok != 'v')
error();
ast->value += str;
tok = lexer(str);
}
if (tok == ';')
break;
else
error();
continue;
}