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Bare functions return success condition.

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chriseth
2015-06-05 17:37:16 +02:00
parent 6667c67364
commit 5a9d01b815
2 changed files with 27 additions and 14 deletions
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ExpressionCompiler.cpp
+24 -11
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@@ -1058,10 +1058,15 @@ void ExpressionCompiler::appendExternalFunctionCall(
unsigned gasStackPos = m_context.currentToBaseStackOffset(gasValueSize);
unsigned valueStackPos = m_context.currentToBaseStackOffset(1);
bool returnSuccessCondition =
_functionType.getLocation() == FunctionType::Location::Bare ||
_functionType.getLocation() == FunctionType::Location::BareCallCode;
//@todo only return the first return value for now
Type const* firstType = _functionType.getReturnParameterTypes().empty() ? nullptr :
_functionType.getReturnParameterTypes().front().get();
unsigned retSize = firstType ? firstType->getCalldataEncodedSize() : 0;
if (returnSuccessCondition)
retSize = 0; // return value actually is success condition
m_context << u256(retSize) << u256(0);
if (_functionType.isBareCall())
@@ -1112,19 +1117,27 @@ void ExpressionCompiler::appendExternalFunctionCall(
else
m_context << eth::Instruction::CALL;
//Propagate error condition (if CALL pushes 0 on stack).
m_context << eth::Instruction::ISZERO;
m_context.appendConditionalJumpTo(m_context.errorTag());
unsigned remainsSize = 1 + // contract address
_functionType.valueSet() +
_functionType.gasSet() +
!_functionType.isBareCall();
if (_functionType.valueSet())
m_context << eth::Instruction::POP;
if (_functionType.gasSet())
m_context << eth::Instruction::POP;
if (!_functionType.isBareCall())
m_context << eth::Instruction::POP;
m_context << eth::Instruction::POP; // pop contract address
if (returnSuccessCondition)
m_context << eth::swapInstruction(remainsSize);
else
{
//Propagate error condition (if CALL pushes 0 on stack).
m_context << eth::Instruction::ISZERO;
m_context.appendConditionalJumpTo(m_context.errorTag());
}
if (_functionType.getLocation() == FunctionType::Location::RIPEMD160)
CompilerUtils(m_context).popStackSlots(remainsSize);
if (returnSuccessCondition)
{
// already there
}
else if (_functionType.getLocation() == FunctionType::Location::RIPEMD160)
{
// fix: built-in contract returns right-aligned data
CompilerUtils(m_context).loadFromMemory(0, IntegerType(160), false, true);