mirror of https://github.com/YosysHQ/yosys.git
115 lines
2.7 KiB
C++
115 lines
2.7 KiB
C++
/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.com>
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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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#ifndef LIBPARSE_H
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#define LIBPARSE_H
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#include "kernel/yosys.h"
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#include <stdio.h>
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#include <string>
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#include <vector>
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#include <set>
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namespace Yosys
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{
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struct LibertyAst
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{
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std::string id, value;
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std::vector<std::string> args;
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std::vector<LibertyAst*> children;
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~LibertyAst();
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const LibertyAst *find(std::string name) const;
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typedef std::set<std::string> sieve;
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void dump(FILE *f, sieve &blacklist, sieve &whitelist, std::string indent = "", std::string path = "", bool path_ok = false) const;
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};
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struct LibertyExpression
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{
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struct Lexer {
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std::string s, expr;
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Lexer(std::string s) : s{s}, expr{s} {}
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bool empty() { return s.empty();}
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char peek() { return s[0]; }
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std::string full_expr() { return expr; }
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char next() {
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char c = s[0];
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s = s.substr(1, s.size());
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return c;
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}
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std::string pin() {
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auto length = s.find_first_of("\t()'!^*& +|");
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auto pin = s.substr(0, length);
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s = s.substr(length, s.size());
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return pin;
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}
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};
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enum Kind {
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AND,
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OR,
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NOT,
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XOR,
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// the standard specifies constants, but they're probably rare in practice.
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PIN,
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EMPTY
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};
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Kind kind;
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std::string name;
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std::vector<LibertyExpression> children;
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LibertyExpression() : kind(Kind::EMPTY) {}
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static LibertyExpression parse(Lexer &s, int min_prio = 0);
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void get_pin_names(pool<std::string>& names);
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bool eval(dict<std::string, bool>& values);
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};
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class LibertyParser
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{
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private:
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std::istream &f;
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int line;
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/* lexer return values:
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'v': identifier, string, array range [...] -> str holds the token string
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'n': newline
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anything else is a single character.
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*/
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int lexer(std::string &str);
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LibertyAst *parse();
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void error();
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void error(const std::string &str);
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public:
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const LibertyAst *ast;
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LibertyParser(std::istream &f) : f(f), line(1), ast(parse()) {}
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~LibertyParser() { if (ast) delete ast; }
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};
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}
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#endif
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