solidity/libyul/AsmParser.cpp

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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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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
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 solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
/**
* @author Christian <c@ethdev.com>
* @date 2016
* Solidity inline assembly parser.
*/
#include <libyul/AsmParser.h>
#include <libyul/Exceptions.h>
#include <liblangutil/Scanner.h>
#include <liblangutil/ErrorReporter.h>
#include <libsolutil/Common.h>
#include <boost/algorithm/string.hpp>
#include <cctype>
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#include <algorithm>
using namespace std;
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using namespace solidity;
using namespace solidity::util;
using namespace solidity::langutil;
using namespace solidity::yul;
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unique_ptr<Block> Parser::parse(std::shared_ptr<Scanner> const& _scanner, bool _reuseScanner)
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{
m_recursionDepth = 0;
_scanner->supportPeriodInIdentifier(true);
ScopeGuard resetScanner([&]{ _scanner->supportPeriodInIdentifier(false); });
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try
{
m_scanner = _scanner;
auto block = make_unique<Block>(parseBlock());
if (!_reuseScanner)
expectToken(Token::EOS);
return block;
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}
catch (FatalError const&)
{
yulAssert(!m_errorReporter.errors().empty(), "Fatal error detected, but no error is reported.");
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}
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return nullptr;
}
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std::map<string, evmasm::Instruction> const& Parser::instructions()
{
// Allowed instructions, lowercase names.
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static map<string, evmasm::Instruction> s_instructions;
if (s_instructions.empty())
{
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for (auto const& instruction: evmasm::c_instructions)
{
if (
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instruction.second == evmasm::Instruction::JUMPDEST ||
evmasm::isPushInstruction(instruction.second)
)
continue;
string name = instruction.first;
transform(name.begin(), name.end(), name.begin(), [](unsigned char _c) { return tolower(_c); });
s_instructions[name] = instruction.second;
}
}
return s_instructions;
}
Block Parser::parseBlock()
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{
RecursionGuard recursionGuard(*this);
Block block = createWithLocation<Block>();
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expectToken(Token::LBrace);
while (currentToken() != Token::RBrace)
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block.statements.emplace_back(parseStatement());
block.location.end = currentLocation().end;
advance();
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return block;
}
Statement Parser::parseStatement()
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{
RecursionGuard recursionGuard(*this);
switch (currentToken())
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{
case Token::Let:
return parseVariableDeclaration();
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case Token::Function:
return parseFunctionDefinition();
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case Token::LBrace:
return parseBlock();
case Token::If:
{
If _if = createWithLocation<If>();
advance();
_if.condition = make_unique<Expression>(parseExpression());
_if.body = parseBlock();
return Statement{move(_if)};
}
case Token::Switch:
{
Switch _switch = createWithLocation<Switch>();
advance();
_switch.expression = make_unique<Expression>(parseExpression());
while (currentToken() == Token::Case)
_switch.cases.emplace_back(parseCase());
if (currentToken() == Token::Default)
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_switch.cases.emplace_back(parseCase());
if (currentToken() == Token::Default)
fatalParserError(6931_error, "Only one default case allowed.");
else if (currentToken() == Token::Case)
fatalParserError(4904_error, "Case not allowed after default case.");
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if (_switch.cases.empty())
fatalParserError(2418_error, "Switch statement without any cases.");
_switch.location.end = _switch.cases.back().body.location.end;
return Statement{move(_switch)};
}
case Token::For:
return parseForLoop();
case Token::Break:
{
Statement stmt{createWithLocation<Break>()};
checkBreakContinuePosition("break");
m_scanner->next();
return stmt;
}
case Token::Continue:
{
Statement stmt{createWithLocation<Continue>()};
checkBreakContinuePosition("continue");
m_scanner->next();
return stmt;
}
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case Token::Identifier:
if (currentLiteral() == "leave")
{
Statement stmt{createWithLocation<Leave>()};
if (!m_insideFunction)
m_errorReporter.syntaxError(8149_error, currentLocation(), "Keyword \"leave\" can only be used inside a function.");
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m_scanner->next();
return stmt;
}
break;
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default:
break;
}
// Options left:
// Simple instruction (might turn into functional),
// literal,
// identifier (might turn into label or functional assignment)
ElementaryOperation elementary(parseElementaryOperation());
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switch (currentToken())
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{
case Token::LParen:
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{
Expression expr = parseCall(std::move(elementary));
return ExpressionStatement{locationOf(expr), expr};
}
case Token::Comma:
case Token::AssemblyAssign:
{
Assignment assignment;
assignment.location = locationOf(elementary);
while (true)
{
if (!holds_alternative<Identifier>(elementary))
{
auto const token = currentToken() == Token::Comma ? "," : ":=";
fatalParserError(
2856_error,
std::string("Variable name must precede \"") +
token +
"\"" +
(currentToken() == Token::Comma ? " in multiple assignment." : " in assignment.")
);
}
auto const& identifier = std::get<Identifier>(elementary);
if (m_dialect.builtin(identifier.name))
fatalParserError(6272_error, "Cannot assign to builtin function \"" + identifier.name.str() + "\".");
assignment.variableNames.emplace_back(identifier);
if (currentToken() != Token::Comma)
break;
expectToken(Token::Comma);
elementary = parseElementaryOperation();
}
expectToken(Token::AssemblyAssign);
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assignment.value = make_unique<Expression>(parseExpression());
assignment.location.end = locationOf(*assignment.value).end;
return Statement{std::move(assignment)};
}
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default:
fatalParserError(6913_error, "Call or assignment expected.");
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break;
}
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if (holds_alternative<Identifier>(elementary))
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{
Identifier& identifier = std::get<Identifier>(elementary);
return ExpressionStatement{identifier.location, { move(identifier) }};
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}
else if (holds_alternative<Literal>(elementary))
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{
Expression expr = std::get<Literal>(elementary);
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return ExpressionStatement{locationOf(expr), expr};
}
else
{
yulAssert(false, "Invalid elementary operation.");
return {};
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}
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}
Case Parser::parseCase()
{
RecursionGuard recursionGuard(*this);
Case _case = createWithLocation<Case>();
if (currentToken() == Token::Default)
advance();
else if (currentToken() == Token::Case)
{
advance();
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ElementaryOperation literal = parseElementaryOperation();
if (!holds_alternative<Literal>(literal))
fatalParserError(4805_error, "Literal expected.");
_case.value = make_unique<Literal>(std::get<Literal>(std::move(literal)));
}
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else
yulAssert(false, "Case or default case expected.");
_case.body = parseBlock();
_case.location.end = _case.body.location.end;
return _case;
}
ForLoop Parser::parseForLoop()
{
RecursionGuard recursionGuard(*this);
ForLoopComponent outerForLoopComponent = m_currentForLoopComponent;
ForLoop forLoop = createWithLocation<ForLoop>();
expectToken(Token::For);
m_currentForLoopComponent = ForLoopComponent::ForLoopPre;
forLoop.pre = parseBlock();
m_currentForLoopComponent = ForLoopComponent::None;
forLoop.condition = make_unique<Expression>(parseExpression());
m_currentForLoopComponent = ForLoopComponent::ForLoopPost;
forLoop.post = parseBlock();
m_currentForLoopComponent = ForLoopComponent::ForLoopBody;
forLoop.body = parseBlock();
forLoop.location.end = forLoop.body.location.end;
m_currentForLoopComponent = outerForLoopComponent;
return forLoop;
}
Expression Parser::parseExpression()
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{
RecursionGuard recursionGuard(*this);
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ElementaryOperation operation = parseElementaryOperation();
if (holds_alternative<FunctionCall>(operation) || currentToken() == Token::LParen)
return parseCall(std::move(operation));
else if (holds_alternative<Identifier>(operation))
return std::get<Identifier>(operation);
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else
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{
yulAssert(holds_alternative<Literal>(operation), "");
return std::get<Literal>(operation);
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}
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}
Parser::ElementaryOperation Parser::parseElementaryOperation()
{
RecursionGuard recursionGuard(*this);
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ElementaryOperation ret;
switch (currentToken())
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{
case Token::Identifier:
case Token::Return:
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case Token::Byte:
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case Token::Bool:
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case Token::Address:
case Token::Var:
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case Token::In:
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{
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YulString literal{currentLiteral()};
if (m_dialect.builtin(literal))
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{
Identifier identifier{currentLocation(), literal};
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advance();
expectToken(Token::LParen, false);
return FunctionCall{identifier.location, identifier, {}};
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}
else
ret = Identifier{currentLocation(), literal};
advance();
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break;
}
case Token::StringLiteral:
case Token::Number:
case Token::TrueLiteral:
case Token::FalseLiteral:
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{
LiteralKind kind = LiteralKind::Number;
switch (currentToken())
{
case Token::StringLiteral:
kind = LiteralKind::String;
break;
case Token::Number:
if (!isValidNumberLiteral(currentLiteral()))
fatalParserError(4828_error, "Invalid number literal.");
kind = LiteralKind::Number;
break;
case Token::TrueLiteral:
case Token::FalseLiteral:
kind = LiteralKind::Boolean;
break;
default:
break;
}
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Literal literal{
currentLocation(),
kind,
YulString{currentLiteral()},
kind == LiteralKind::Boolean ? m_dialect.boolType : m_dialect.defaultType
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};
advance();
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if (currentToken() == Token::Colon)
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{
expectToken(Token::Colon);
literal.location.end = currentLocation().end;
literal.type = expectAsmIdentifier();
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}
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ret = std::move(literal);
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break;
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}
default:
fatalParserError(1856_error, "Literal or identifier expected.");
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}
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return ret;
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}
VariableDeclaration Parser::parseVariableDeclaration()
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{
RecursionGuard recursionGuard(*this);
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VariableDeclaration varDecl = createWithLocation<VariableDeclaration>();
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expectToken(Token::Let);
while (true)
{
varDecl.variables.emplace_back(parseTypedName());
if (currentToken() == Token::Comma)
expectToken(Token::Comma);
else
break;
}
if (currentToken() == Token::AssemblyAssign)
{
expectToken(Token::AssemblyAssign);
varDecl.value = make_unique<Expression>(parseExpression());
varDecl.location.end = locationOf(*varDecl.value).end;
}
else
varDecl.location.end = varDecl.variables.back().location.end;
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return varDecl;
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}
FunctionDefinition Parser::parseFunctionDefinition()
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{
RecursionGuard recursionGuard(*this);
if (m_currentForLoopComponent == ForLoopComponent::ForLoopPre)
m_errorReporter.syntaxError(
3441_error,
currentLocation(),
"Functions cannot be defined inside a for-loop init block."
);
ForLoopComponent outerForLoopComponent = m_currentForLoopComponent;
m_currentForLoopComponent = ForLoopComponent::None;
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FunctionDefinition funDef = createWithLocation<FunctionDefinition>();
expectToken(Token::Function);
funDef.name = expectAsmIdentifier();
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expectToken(Token::LParen);
while (currentToken() != Token::RParen)
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{
funDef.parameters.emplace_back(parseTypedName());
if (currentToken() == Token::RParen)
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break;
expectToken(Token::Comma);
}
expectToken(Token::RParen);
if (currentToken() == Token::Sub)
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{
expectToken(Token::Sub);
expectToken(Token::GreaterThan);
while (true)
{
funDef.returnVariables.emplace_back(parseTypedName());
if (currentToken() == Token::LBrace)
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break;
expectToken(Token::Comma);
}
}
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bool preInsideFunction = m_insideFunction;
m_insideFunction = true;
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funDef.body = parseBlock();
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m_insideFunction = preInsideFunction;
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funDef.location.end = funDef.body.location.end;
m_currentForLoopComponent = outerForLoopComponent;
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return funDef;
}
Expression Parser::parseCall(Parser::ElementaryOperation&& _initialOp)
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{
RecursionGuard recursionGuard(*this);
FunctionCall ret;
if (holds_alternative<Identifier>(_initialOp))
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{
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ret.functionName = std::move(std::get<Identifier>(_initialOp));
ret.location = ret.functionName.location;
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}
else if (holds_alternative<FunctionCall>(_initialOp))
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ret = std::move(std::get<FunctionCall>(_initialOp));
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else
fatalParserError(9980_error, "Function name expected.");
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expectToken(Token::LParen);
if (currentToken() != Token::RParen)
{
ret.arguments.emplace_back(parseExpression());
while (currentToken() != Token::RParen)
{
expectToken(Token::Comma);
ret.arguments.emplace_back(parseExpression());
}
}
ret.location.end = currentLocation().end;
expectToken(Token::RParen);
return ret;
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}
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TypedName Parser::parseTypedName()
{
RecursionGuard recursionGuard(*this);
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TypedName typedName = createWithLocation<TypedName>();
typedName.name = expectAsmIdentifier();
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if (currentToken() == Token::Colon)
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{
expectToken(Token::Colon);
typedName.location.end = currentLocation().end;
typedName.type = expectAsmIdentifier();
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}
else
typedName.type = m_dialect.defaultType;
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return typedName;
}
YulString Parser::expectAsmIdentifier()
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{
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YulString name{currentLiteral()};
switch (currentToken())
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{
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case Token::Return:
case Token::Byte:
case Token::Address:
case Token::Bool:
case Token::Identifier:
case Token::Var:
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case Token::In:
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break;
default:
expectToken(Token::Identifier);
break;
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}
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if (m_dialect.builtin(name))
fatalParserError(5568_error, "Cannot use builtin function name \"" + name.str() + "\" as identifier name.");
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advance();
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return name;
}
void Parser::checkBreakContinuePosition(string const& _which)
{
switch (m_currentForLoopComponent)
{
case ForLoopComponent::None:
m_errorReporter.syntaxError(2592_error, currentLocation(), "Keyword \"" + _which + "\" needs to be inside a for-loop body.");
break;
case ForLoopComponent::ForLoopPre:
m_errorReporter.syntaxError(9615_error, currentLocation(), "Keyword \"" + _which + "\" in for-loop init block is not allowed.");
break;
case ForLoopComponent::ForLoopPost:
m_errorReporter.syntaxError(2461_error, currentLocation(), "Keyword \"" + _which + "\" in for-loop post block is not allowed.");
break;
case ForLoopComponent::ForLoopBody:
break;
}
}
bool Parser::isValidNumberLiteral(string const& _literal)
{
try
{
// Try to convert _literal to u256.
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[[maybe_unused]] auto tmp = u256(_literal);
}
catch (...)
{
return false;
}
if (boost::starts_with(_literal, "0x"))
return true;
else
return _literal.find_first_not_of("0123456789") == string::npos;
}