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Code generation for for-loops.

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chriseth 2017-06-09 13:59:26 +02:00 committed by Alex Beregszaszi
parent 868b5ad3aa
commit 0745628a73
1 changed files with 38 additions and 6 deletions
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44
libjulia/backends/evm/EVMCodeTransform.cpp
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@ -33,12 +33,6 @@ using namespace dev::julia;
using namespace dev::solidity;
using namespace dev::solidity::assembly;
void CodeTransform::operator()(ForLoop const&)
{
solAssert(false, "For loop not removed during desugaring phase.");
}
void CodeTransform::operator()(VariableDeclaration const& _varDecl)
{
solAssert(m_scope, "");
@ -344,6 +338,44 @@ void CodeTransform::operator()(FunctionDefinition const& _function)
checkStackHeight(&_function);
}
void CodeTransform::operator()(ForLoop const& _forLoop)
{
Scope* originalScope = m_scope;
// We start with visiting the block, but not finalizing it.
m_scope = m_info.scopes.at(&_forLoop.pre).get();
int stackStartHeight = m_assembly.stackHeight();
for (auto const& statement: _forLoop.pre.statements)
boost::apply_visitor(*this, statement);
// TODO: When we implement break and continue, the labels and the stack heights at that point
// have to be stored in a stack.
AbstractAssembly::LabelID loopStart = m_assembly.newLabelId();
AbstractAssembly::LabelID loopEnd = m_assembly.newLabelId();
AbstractAssembly::LabelID postPart = m_assembly.newLabelId();
m_assembly.appendLabel(loopStart);
visitExpression(*_forLoop.condition);
m_assembly.setSourceLocation(_forLoop.location);
m_assembly.appendInstruction(solidity::Instruction::ISZERO);
m_assembly.appendJumpToIf(loopEnd);
(*this)(_forLoop.body);
m_assembly.setSourceLocation(_forLoop.location);
m_assembly.appendLabel(postPart);
(*this)(_forLoop.post);
m_assembly.setSourceLocation(_forLoop.location);
m_assembly.appendJumpTo(loopStart);
m_assembly.appendLabel(loopEnd);
finalizeBlock(_forLoop.pre, stackStartHeight);
m_scope = originalScope;
}
void CodeTransform::operator()(Block const& _block)
{
Scope* originalScope = m_scope;