mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
e4b18e85e6
The function SourceLocation::isEmpty() had somewhat dual role. Sometimes it indicates that the SourceLocation is invalid. Sometimes it means that there is no corresponding source text. Hence the proposal is to replace it with two functions, isValid() and hasText(). I also removed Scanner::sourceAt(). (Do we have a rule of thumb to remove unused code?) Since hasText() checks that start and end are valid indices for source, I adjusted a couple of tests to avoid empty source strings.
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2016
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* Solidity inline assembly parser.
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*/
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#pragma once
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#include <libyul/AsmData.h>
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#include <libyul/Dialect.h>
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#include <liblangutil/SourceLocation.h>
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#include <liblangutil/Scanner.h>
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#include <liblangutil/ParserBase.h>
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#include <libevmasm/Instruction.h>
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#include <memory>
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#include <variant>
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#include <vector>
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namespace solidity::yul
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{
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class Parser: public langutil::ParserBase
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{
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public:
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enum class ForLoopComponent
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{
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None, ForLoopPre, ForLoopPost, ForLoopBody
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};
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explicit Parser(langutil::ErrorReporter& _errorReporter, Dialect const& _dialect):
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ParserBase(_errorReporter), m_dialect(_dialect) {}
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/// Parses an inline assembly block starting with `{` and ending with `}`.
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/// @param _reuseScanner if true, do check for end of input after the `}`.
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/// @returns an empty shared pointer on error.
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std::unique_ptr<Block> parse(std::shared_ptr<langutil::Scanner> const& _scanner, bool _reuseScanner);
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/// @returns a map of all EVM instructions available to assembly.
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static std::map<std::string, evmasm::Instruction> const& instructions();
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protected:
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using ElementaryOperation = std::variant<Literal, Identifier, FunctionCall>;
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/// Creates an inline assembly node with the given source location.
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template <class T> T createWithLocation(langutil::SourceLocation const& _loc = {}) const
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{
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T r;
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r.location = _loc;
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if (!r.location.hasText())
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{
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r.location.start = position();
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r.location.end = endPosition();
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}
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if (!r.location.source)
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r.location.source = m_scanner->charStream();
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return r;
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}
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langutil::SourceLocation location() const { return {position(), endPosition(), m_scanner->charStream()}; }
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Block parseBlock();
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Statement parseStatement();
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Case parseCase();
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ForLoop parseForLoop();
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/// Parses a functional expression that has to push exactly one stack element
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Expression parseExpression();
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static std::map<evmasm::Instruction, std::string> const& instructionNames();
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/// Parses an elementary operation, i.e. a literal, identifier, instruction or
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/// builtin functian call (only the name).
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ElementaryOperation parseElementaryOperation();
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VariableDeclaration parseVariableDeclaration();
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FunctionDefinition parseFunctionDefinition();
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Expression parseCall(ElementaryOperation&& _initialOp);
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TypedName parseTypedName();
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YulString expectAsmIdentifier();
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/// Reports an error if we are currently not inside the body part of a for loop.
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void checkBreakContinuePosition(std::string const& _which);
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static bool isValidNumberLiteral(std::string const& _literal);
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private:
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Dialect const& m_dialect;
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ForLoopComponent m_currentForLoopComponent = ForLoopComponent::None;
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bool m_insideFunction = false;
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};
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}
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