/* This file is part of cpp-ethereum. cpp-ethereum is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. cpp-ethereum is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with cpp-ethereum. If not, see . This file is derived from the file "scanner.cc", which was part of the V8 project. The original copyright header follows: Copyright 2006-2012, the V8 project authors. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of Google Inc. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** * @author Christian * @date 2014 * Solidity scanner. */ #include #include #include using namespace std; namespace dev { namespace solidity { namespace { bool IsDecimalDigit(char c) { return '0' <= c && c <= '9'; } bool IsHexDigit(char c) { return IsDecimalDigit(c) || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F'); } bool IsLineTerminator(char c) { return c == '\n'; } bool IsWhiteSpace(char c) { return c == ' ' || c == '\n' || c == '\t'; } bool IsIdentifierStart(char c) { return c == '_' || c == '$' || ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'); } bool IsIdentifierPart(char c) { return IsIdentifierStart(c) || IsDecimalDigit(c); } int HexValue(char c) { if (c >= '0' && c <= '9') return c - '0'; else if (c >= 'a' && c <= 'f') return c - 'a' + 10; else if (c >= 'A' && c <= 'F') return c - 'A' + 10; else return -1; } } // end anonymous namespace void Scanner::reset(CharStream const& _source) { bool foundDocComment; m_source = _source; m_char = m_source.get(); skipWhitespace(); foundDocComment = scanToken(); // special version of Scanner:next() taking the previous scanToken() result into account m_current_token = m_next_token; if (scanToken() || foundDocComment) m_skipped_comment = m_next_skipped_comment; } bool Scanner::scanHexByte(char& o_scannedByte) { char x = 0; for (int i = 0; i < 2; i++) { int d = HexValue(m_char); if (d < 0) { rollback(i); return false; } x = x * 16 + d; advance(); } o_scannedByte = x; return true; } // Ensure that tokens can be stored in a byte. BOOST_STATIC_ASSERT(Token::NUM_TOKENS <= 0x100); Token::Value Scanner::next() { m_current_token = m_next_token; if (scanToken()) m_skipped_comment = m_next_skipped_comment; return m_current_token.token; } Token::Value Scanner::selectToken(char _next, Token::Value _then, Token::Value _else) { advance(); if (m_char == _next) return selectToken(_then); else return _else; } bool Scanner::skipWhitespace() { int const start_position = getSourcePos(); while (IsWhiteSpace(m_char)) advance(); // Return whether or not we skipped any characters. return getSourcePos() != start_position; } Token::Value Scanner::skipSingleLineComment() { // The line terminator at the end of the line is not considered // to be part of the single-line comment; it is recognized // separately by the lexical grammar and becomes part of the // stream of input elements for the syntactic grammar while (advance() && !IsLineTerminator(m_char)) { }; return Token::WHITESPACE; } /// For the moment this function simply consumes a single line triple slash doc comment Token::Value Scanner::scanDocumentationComment() { LiteralScope literal(this); advance(); //consume the last '/' while (!isSourcePastEndOfInput() && !IsLineTerminator(m_char)) { char c = m_char; advance(); addCommentLiteralChar(c); } literal.Complete(); return Token::COMMENT_LITERAL; } Token::Value Scanner::skipMultiLineComment() { if (asserts(m_char == '*')) BOOST_THROW_EXCEPTION(InternalCompilerError()); advance(); while (!isSourcePastEndOfInput()) { char ch = m_char; advance(); // If we have reached the end of the multi-line comment, we // consume the '/' and insert a whitespace. This way all // multi-line comments are treated as whitespace. if (ch == '*' && m_char == '/') { m_char = ' '; return Token::WHITESPACE; } } // Unterminated multi-line comment. return Token::ILLEGAL; } bool Scanner::scanToken() { bool foundDocComment = false; m_next_token.literal.clear(); Token::Value token; do { // Remember the position of the next token m_next_token.location.start = getSourcePos(); switch (m_char) { case '\n': // fall-through case ' ': case '\t': token = selectToken(Token::WHITESPACE); break; case '"': case '\'': token = scanString(); break; case '<': // < <= << <<= advance(); if (m_char == '=') token = selectToken(Token::LTE); else if (m_char == '<') token = selectToken('=', Token::ASSIGN_SHL, Token::SHL); else token = Token::LT; break; case '>': // > >= >> >>= >>> >>>= advance(); if (m_char == '=') token = selectToken(Token::GTE); else if (m_char == '>') { // >> >>= >>> >>>= advance(); if (m_char == '=') token = selectToken(Token::ASSIGN_SAR); else if (m_char == '>') token = selectToken('=', Token::ASSIGN_SHR, Token::SHR); else token = Token::SAR; } else token = Token::GT; break; case '=': // = == => advance(); if (m_char == '=') token = selectToken(Token::EQ); else if (m_char == '>') token = selectToken(Token::ARROW); else token = Token::ASSIGN; break; case '!': // ! != advance(); if (m_char == '=') token = selectToken(Token::NE); else token = Token::NOT; break; case '+': // + ++ += advance(); if (m_char == '+') token = selectToken(Token::INC); else if (m_char == '=') token = selectToken(Token::ASSIGN_ADD); else token = Token::ADD; break; case '-': // - -- -= Number advance(); if (m_char == '-') { advance(); token = Token::DEC; } else if (m_char == '=') token = selectToken(Token::ASSIGN_SUB); else if (m_char == '.' || IsDecimalDigit(m_char)) token = scanNumber('-'); else token = Token::SUB; break; case '*': // * *= token = selectToken('=', Token::ASSIGN_MUL, Token::MUL); break; case '%': // % %= token = selectToken('=', Token::ASSIGN_MOD, Token::MOD); break; case '/': // / // /* /= advance(); if (m_char == '/') { if (!advance()) /* double slash comment directly before EOS */ token = Token::WHITESPACE; else if (m_char == '/') { Token::Value comment; m_next_skipped_comment.location.start = getSourcePos(); comment = scanDocumentationComment(); m_next_skipped_comment.location.end = getSourcePos(); m_next_skipped_comment.token = comment; token = Token::WHITESPACE; foundDocComment = true; } else token = skipSingleLineComment(); } else if (m_char == '*') token = skipMultiLineComment(); else if (m_char == '=') token = selectToken(Token::ASSIGN_DIV); else token = Token::DIV; break; case '&': // & && &= advance(); if (m_char == '&') token = selectToken(Token::AND); else if (m_char == '=') token = selectToken(Token::ASSIGN_BIT_AND); else token = Token::BIT_AND; break; case '|': // | || |= advance(); if (m_char == '|') token = selectToken(Token::OR); else if (m_char == '=') token = selectToken(Token::ASSIGN_BIT_OR); else token = Token::BIT_OR; break; case '^': // ^ ^= token = selectToken('=', Token::ASSIGN_BIT_XOR, Token::BIT_XOR); break; case '.': // . Number advance(); if (IsDecimalDigit(m_char)) token = scanNumber('.'); else token = Token::PERIOD; break; case ':': token = selectToken(Token::COLON); break; case ';': token = selectToken(Token::SEMICOLON); break; case ',': token = selectToken(Token::COMMA); break; case '(': token = selectToken(Token::LPAREN); break; case ')': token = selectToken(Token::RPAREN); break; case '[': token = selectToken(Token::LBRACK); break; case ']': token = selectToken(Token::RBRACK); break; case '{': token = selectToken(Token::LBRACE); break; case '}': token = selectToken(Token::RBRACE); break; case '?': token = selectToken(Token::CONDITIONAL); break; case '~': token = selectToken(Token::BIT_NOT); break; default: if (IsIdentifierStart(m_char)) token = scanIdentifierOrKeyword(); else if (IsDecimalDigit(m_char)) token = scanNumber(); else if (skipWhitespace()) token = Token::WHITESPACE; else if (isSourcePastEndOfInput()) token = Token::EOS; else token = selectToken(Token::ILLEGAL); break; } // Continue scanning for tokens as long as we're just skipping // whitespace. } while (token == Token::WHITESPACE); m_next_token.location.end = getSourcePos(); m_next_token.token = token; return foundDocComment; } bool Scanner::scanEscape() { char c = m_char; advance(); // Skip escaped newlines. if (IsLineTerminator(c)) return true; switch (c) { case '\'': // fall through case '"': // fall through case '\\': break; case 'b': c = '\b'; break; case 'f': c = '\f'; break; case 'n': c = '\n'; break; case 'r': c = '\r'; break; case 't': c = '\t'; break; case 'v': c = '\v'; break; case 'x': if (!scanHexByte(c)) return false; break; } addLiteralChar(c); return true; } Token::Value Scanner::scanString() { char const quote = m_char; advance(); // consume quote LiteralScope literal(this); while (m_char != quote && !isSourcePastEndOfInput() && !IsLineTerminator(m_char)) { char c = m_char; advance(); if (c == '\\') { if (isSourcePastEndOfInput() || !scanEscape()) return Token::ILLEGAL; } else addLiteralChar(c); } if (m_char != quote) return Token::ILLEGAL; literal.Complete(); advance(); // consume quote return Token::STRING_LITERAL; } void Scanner::scanDecimalDigits() { while (IsDecimalDigit(m_char)) addLiteralCharAndAdvance(); } Token::Value Scanner::scanNumber(char _charSeen) { enum { DECIMAL, HEX, BINARY } kind = DECIMAL; LiteralScope literal(this); if (_charSeen == '.') { // we have already seen a decimal point of the float addLiteralChar('.'); scanDecimalDigits(); // we know we have at least one digit } else { if (_charSeen == '-') addLiteralChar('-'); // if the first character is '0' we must check for octals and hex if (m_char == '0') { addLiteralCharAndAdvance(); // either 0, 0exxx, 0Exxx, 0.xxx or a hex number if (m_char == 'x' || m_char == 'X') { // hex number kind = HEX; addLiteralCharAndAdvance(); if (!IsHexDigit(m_char)) return Token::ILLEGAL; // we must have at least one hex digit after 'x'/'X' while (IsHexDigit(m_char)) addLiteralCharAndAdvance(); } } // Parse decimal digits and allow trailing fractional part. if (kind == DECIMAL) { scanDecimalDigits(); // optional if (m_char == '.') { addLiteralCharAndAdvance(); scanDecimalDigits(); // optional } } } // scan exponent, if any if (m_char == 'e' || m_char == 'E') { if (asserts(kind != HEX)) // 'e'/'E' must be scanned as part of the hex number BOOST_THROW_EXCEPTION(InternalCompilerError()); if (kind != DECIMAL) return Token::ILLEGAL; // scan exponent addLiteralCharAndAdvance(); if (m_char == '+' || m_char == '-') addLiteralCharAndAdvance(); if (!IsDecimalDigit(m_char)) return Token::ILLEGAL; // we must have at least one decimal digit after 'e'/'E' scanDecimalDigits(); } // The source character immediately following a numeric literal must // not be an identifier start or a decimal digit; see ECMA-262 // section 7.8.3, page 17 (note that we read only one decimal digit // if the value is 0). if (IsDecimalDigit(m_char) || IsIdentifierStart(m_char)) return Token::ILLEGAL; literal.Complete(); return Token::NUMBER; } // ---------------------------------------------------------------------------- // Keyword Matcher #define KEYWORDS(KEYWORD_GROUP, KEYWORD) \ KEYWORD_GROUP('a') \ KEYWORD("address", Token::ADDRESS) \ KEYWORD_GROUP('b') \ KEYWORD("break", Token::BREAK) \ KEYWORD("bool", Token::BOOL) \ KEYWORD_GROUP('c') \ KEYWORD("case", Token::CASE) \ KEYWORD("const", Token::CONST) \ KEYWORD("continue", Token::CONTINUE) \ KEYWORD("contract", Token::CONTRACT) \ KEYWORD_GROUP('d') \ KEYWORD("default", Token::DEFAULT) \ KEYWORD("delete", Token::DELETE) \ KEYWORD("do", Token::DO) \ KEYWORD_GROUP('e') \ KEYWORD("else", Token::ELSE) \ KEYWORD("extends", Token::EXTENDS) \ KEYWORD_GROUP('f') \ KEYWORD("false", Token::FALSE_LITERAL) \ KEYWORD("for", Token::FOR) \ KEYWORD("function", Token::FUNCTION) \ KEYWORD_GROUP('h') \ KEYWORD("hash", Token::HASH) \ KEYWORD("hash8", Token::HASH8) \ KEYWORD("hash16", Token::HASH16) \ KEYWORD("hash24", Token::HASH24) \ KEYWORD("hash32", Token::HASH32) \ KEYWORD("hash40", Token::HASH40) \ KEYWORD("hash48", Token::HASH48) \ KEYWORD("hash56", Token::HASH56) \ KEYWORD("hash64", Token::HASH64) \ KEYWORD("hash72", Token::HASH72) \ KEYWORD("hash80", Token::HASH80) \ KEYWORD("hash88", Token::HASH88) \ KEYWORD("hash96", Token::HASH96) \ KEYWORD("hash104", Token::HASH104) \ KEYWORD("hash112", Token::HASH112) \ KEYWORD("hash120", Token::HASH120) \ KEYWORD("hash128", Token::HASH128) \ KEYWORD("hash136", Token::HASH136) \ KEYWORD("hash144", Token::HASH144) \ KEYWORD("hash152", Token::HASH152) \ KEYWORD("hash160", Token::HASH160) \ KEYWORD("hash168", Token::HASH168) \ KEYWORD("hash178", Token::HASH176) \ KEYWORD("hash184", Token::HASH184) \ KEYWORD("hash192", Token::HASH192) \ KEYWORD("hash200", Token::HASH200) \ KEYWORD("hash208", Token::HASH208) \ KEYWORD("hash216", Token::HASH216) \ KEYWORD("hash224", Token::HASH224) \ KEYWORD("hash232", Token::HASH232) \ KEYWORD("hash240", Token::HASH240) \ KEYWORD("hash248", Token::HASH248) \ KEYWORD("hash256", Token::HASH256) \ KEYWORD_GROUP('i') \ KEYWORD("if", Token::IF) \ KEYWORD("in", Token::IN) \ KEYWORD("int", Token::INT) \ KEYWORD("int8", Token::INT8) \ KEYWORD("int16", Token::INT16) \ KEYWORD("int24", Token::INT24) \ KEYWORD("int32", Token::INT32) \ KEYWORD("int40", Token::INT40) \ KEYWORD("int48", Token::INT48) \ KEYWORD("int56", Token::INT56) \ KEYWORD("int64", Token::INT64) \ KEYWORD("int72", Token::INT72) \ KEYWORD("int80", Token::INT80) \ KEYWORD("int88", Token::INT88) \ KEYWORD("int96", Token::INT96) \ KEYWORD("int104", Token::INT104) \ KEYWORD("int112", Token::INT112) \ KEYWORD("int120", Token::INT120) \ KEYWORD("int128", Token::INT128) \ KEYWORD("int136", Token::INT136) \ KEYWORD("int144", Token::INT144) \ KEYWORD("int152", Token::INT152) \ KEYWORD("int160", Token::INT160) \ KEYWORD("int168", Token::INT168) \ KEYWORD("int178", Token::INT176) \ KEYWORD("int184", Token::INT184) \ KEYWORD("int192", Token::INT192) \ KEYWORD("int200", Token::INT200) \ KEYWORD("int208", Token::INT208) \ KEYWORD("int216", Token::INT216) \ KEYWORD("int224", Token::INT224) \ KEYWORD("int232", Token::INT232) \ KEYWORD("int240", Token::INT240) \ KEYWORD("int248", Token::INT248) \ KEYWORD("int256", Token::INT256) \ KEYWORD_GROUP('l') \ KEYWORD_GROUP('m') \ KEYWORD("mapping", Token::MAPPING) \ KEYWORD_GROUP('n') \ KEYWORD("new", Token::NEW) \ KEYWORD("null", Token::NULL_LITERAL) \ KEYWORD_GROUP('p') \ KEYWORD("private", Token::PRIVATE) \ KEYWORD("public", Token::PUBLIC) \ KEYWORD_GROUP('r') \ KEYWORD("real", Token::REAL) \ KEYWORD("return", Token::RETURN) \ KEYWORD("returns", Token::RETURNS) \ KEYWORD_GROUP('s') \ KEYWORD("string", Token::STRING_TYPE) \ KEYWORD("struct", Token::STRUCT) \ KEYWORD("switch", Token::SWITCH) \ KEYWORD_GROUP('t') \ KEYWORD("text", Token::TEXT) \ KEYWORD("this", Token::THIS) \ KEYWORD("true", Token::TRUE_LITERAL) \ KEYWORD_GROUP('u') \ KEYWORD("uint", Token::UINT) \ KEYWORD("uint8", Token::UINT8) \ KEYWORD("uint16", Token::UINT16) \ KEYWORD("uint24", Token::UINT24) \ KEYWORD("uint32", Token::UINT32) \ KEYWORD("uint40", Token::UINT40) \ KEYWORD("uint48", Token::UINT48) \ KEYWORD("uint56", Token::UINT56) \ KEYWORD("uint64", Token::UINT64) \ KEYWORD("uint72", Token::UINT72) \ KEYWORD("uint80", Token::UINT80) \ KEYWORD("uint88", Token::UINT88) \ KEYWORD("uint96", Token::UINT96) \ KEYWORD("uint104", Token::UINT104) \ KEYWORD("uint112", Token::UINT112) \ KEYWORD("uint120", Token::UINT120) \ KEYWORD("uint128", Token::UINT128) \ KEYWORD("uint136", Token::UINT136) \ KEYWORD("uint144", Token::UINT144) \ KEYWORD("uint152", Token::UINT152) \ KEYWORD("uint160", Token::UINT160) \ KEYWORD("uint168", Token::UINT168) \ KEYWORD("uint178", Token::UINT176) \ KEYWORD("uint184", Token::UINT184) \ KEYWORD("uint192", Token::UINT192) \ KEYWORD("uint200", Token::UINT200) \ KEYWORD("uint208", Token::UINT208) \ KEYWORD("uint216", Token::UINT216) \ KEYWORD("uint224", Token::UINT224) \ KEYWORD("uint232", Token::UINT232) \ KEYWORD("uint240", Token::UINT240) \ KEYWORD("uint248", Token::UINT248) \ KEYWORD("uint256", Token::UINT256) \ KEYWORD("ureal", Token::UREAL) \ KEYWORD_GROUP('v') \ KEYWORD("var", Token::VAR) \ KEYWORD_GROUP('w') \ KEYWORD("while", Token::WHILE) \ static Token::Value KeywordOrIdentifierToken(string const& input) { if (asserts(!input.empty())) BOOST_THROW_EXCEPTION(InternalCompilerError()); int const kMinLength = 2; int const kMaxLength = 10; if (input.size() < kMinLength || input.size() > kMaxLength) return Token::IDENTIFIER; switch (input[0]) { default: #define KEYWORD_GROUP_CASE(ch) \ break; \ case ch: #define KEYWORD(keyword, token) \ { \ /* 'keyword' is a char array, so sizeof(keyword) is */ \ /* strlen(keyword) plus 1 for the NUL char. */ \ int const keyword_length = sizeof(keyword) - 1; \ BOOST_STATIC_ASSERT(keyword_length >= kMinLength); \ BOOST_STATIC_ASSERT(keyword_length <= kMaxLength); \ if (input == keyword) \ return token; \ } KEYWORDS(KEYWORD_GROUP_CASE, KEYWORD) } return Token::IDENTIFIER; } Token::Value Scanner::scanIdentifierOrKeyword() { if (asserts(IsIdentifierStart(m_char))) BOOST_THROW_EXCEPTION(InternalCompilerError()); LiteralScope literal(this); addLiteralCharAndAdvance(); // Scan the rest of the identifier characters. while (IsIdentifierPart(m_char)) addLiteralCharAndAdvance(); literal.Complete(); return KeywordOrIdentifierToken(m_next_token.literal); } char CharStream::advanceAndGet() { if (isPastEndOfInput()) return 0; ++m_pos; if (isPastEndOfInput()) return 0; return get(); } char CharStream::rollback(size_t _amount) { if (asserts(m_pos >= _amount)) BOOST_THROW_EXCEPTION(InternalCompilerError()); m_pos -= _amount; return get(); } string CharStream::getLineAtPosition(int _position) const { // if _position points to \n, it returns the line before the \n using size_type = string::size_type; size_type searchStart = min(m_source.size(), _position); if (searchStart > 0) searchStart--; size_type lineStart = m_source.rfind('\n', searchStart); if (lineStart == string::npos) lineStart = 0; else lineStart++; return m_source.substr(lineStart, min(m_source.find('\n', lineStart), m_source.size()) - lineStart); } tuple CharStream::translatePositionToLineColumn(int _position) const { using size_type = string::size_type; size_type searchPosition = min(m_source.size(), _position); int lineNumber = count(m_source.begin(), m_source.begin() + searchPosition, '\n'); size_type lineStart; if (searchPosition == 0) lineStart = 0; else { lineStart = m_source.rfind('\n', searchPosition - 1); lineStart = lineStart == string::npos ? 0 : lineStart + 1; } return tuple(lineNumber, searchPosition - lineStart); } } }