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Remove unintentional copy in assignment operation.

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This commit is contained in:
chriseth 2017-09-20 11:16:07 +02:00
parent 6948758156
commit e14ab959f9
2 changed files with 25 additions and 20 deletions
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42
libjulia/backends/evm/EVMCodeTransform.cpp
View File

@ -65,14 +65,14 @@ void CodeTransform::operator()(Assignment const& _assignment)
expectDeposit(_assignment.variableNames.size(), height);
m_assembly.setSourceLocation(_assignment.location);
generateAssignment(_assignment.variableNames);
generateMultiAssignment(_assignment.variableNames);
checkStackHeight(&_assignment);
}
void CodeTransform::operator()(StackAssignment const& _assignment)
{
m_assembly.setSourceLocation(_assignment.location);
generateAssignment({_assignment.variableName});
generateAssignment(_assignment.variableName);
checkStackHeight(&_assignment);
}
@ -472,27 +472,31 @@ void CodeTransform::finalizeBlock(Block const& _block, int blockStartStackHeight
checkStackHeight(&_block);
}
void CodeTransform::generateAssignment(vector<Identifier> const& _variableNames)
void CodeTransform::generateMultiAssignment(vector<Identifier> const& _variableNames)
{
solAssert(m_scope, "");
for (auto const& variableName: _variableNames | boost::adaptors::reversed)
generateAssignment(variableName);
}
void CodeTransform::generateAssignment(Identifier const& _variableName)
{
solAssert(m_scope, "");
auto var = m_scope->lookup(_variableName.name);
if (var)
{
auto var = m_scope->lookup(variableName.name);
if (var)
{
Scope::Variable const& _var = boost::get<Scope::Variable>(*var);
if (int heightDiff = variableHeightDiff(_var, true))
m_assembly.appendInstruction(solidity::swapInstruction(heightDiff - 1));
m_assembly.appendInstruction(solidity::Instruction::POP);
}
else
{
solAssert(
m_identifierAccess.generateCode,
"Identifier not found and no external access available."
);
m_identifierAccess.generateCode(variableName, IdentifierContext::LValue, m_assembly);
}
Scope::Variable const& _var = boost::get<Scope::Variable>(*var);
if (int heightDiff = variableHeightDiff(_var, true))
m_assembly.appendInstruction(solidity::swapInstruction(heightDiff - 1));
m_assembly.appendInstruction(solidity::Instruction::POP);
}
else
{
solAssert(
m_identifierAccess.generateCode,
"Identifier not found and no external access available."
);
m_identifierAccess.generateCode(_variableName, IdentifierContext::LValue, m_assembly);
}
}

3
libjulia/backends/evm/EVMCodeTransform.h
View File

@ -124,7 +124,8 @@ private:
/// to @a _blackStartStackHeight.
void finalizeBlock(solidity::assembly::Block const& _block, int _blockStartStackHeight);
void generateAssignment(std::vector<solidity::assembly::Identifier> const& _variableNames);
void generateMultiAssignment(std::vector<solidity::assembly::Identifier> const& _variableNames);
void generateAssignment(solidity::assembly::Identifier const& _variableName);
/// Determines the stack height difference to the given variables. Throws
/// if it is not yet in scope or the height difference is too large. Returns