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Support explicit conversion of external function type to address

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This commit is contained in:
Alex Beregszaszi 2016-12-01 12:12:10 +00:00
parent c1a675da4f
commit 767ec1d670
4 changed files with 25 additions and 1 deletions
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11
libsolidity/ast/Types.cpp
View File

@ -2158,6 +2158,17 @@ bool FunctionType::operator==(Type const& _other) const
return true;
}
bool FunctionType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
if (m_location == Location::External && _convertTo.category() == Category::Integer)
{
IntegerType const& convertTo = dynamic_cast<IntegerType const&>(_convertTo);
if (convertTo.isAddress())
return true;
}
return _convertTo.category() == category();
}
TypePointer FunctionType::unaryOperatorResult(Token::Value _operator) const
{
if (_operator == Token::Value::Delete)

1
libsolidity/ast/Types.h
View File

@ -922,6 +922,7 @@ public:
virtual std::string identifier() const override;
virtual bool operator==(Type const& _other) const override;
virtual bool isExplicitlyConvertibleTo(Type const& _convertTo) const override;
virtual TypePointer unaryOperatorResult(Token::Value _operator) const override;
virtual std::string canonicalName(bool /*_addDataLocation*/) const override;
virtual std::string toString(bool _short) const override;

12
libsolidity/codegen/CompilerUtils.cpp
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@ -787,6 +787,18 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
if (_cleanupNeeded)
m_context << Instruction::ISZERO << Instruction::ISZERO;
break;
case Type::Category::Function:
{
solAssert(targetTypeCategory == Type::Category::Integer, "Invalid conversion for function type.");
IntegerType const& targetType = dynamic_cast<IntegerType const&>(_targetType);
solAssert(targetType.isAddress(), "Function type can only be converted to address.");
FunctionType const& typeOnStack = dynamic_cast<FunctionType const&>(_typeOnStack);
solAssert(typeOnStack.location() == FunctionType::Location::External, "Only external function type can be converted.");
// stack: <address> <function_id>
m_context << Instruction::POP;
break;
}
default:
// All other types should not be convertible to non-equal types.
solAssert(_typeOnStack == _targetType, "Invalid type conversion requested.");

2
libsolidity/codegen/ContractCompiler.cpp
View File

@ -42,7 +42,7 @@ class StackHeightChecker
public:
StackHeightChecker(CompilerContext const& _context):
m_context(_context), stackHeight(m_context.stackHeight()) {}
void check() { solAssert(m_context.stackHeight() == stackHeight, "I sense a disturbance in the stack."); }
void check() { solAssert(m_context.stackHeight() == stackHeight, "I sense a disturbance in the stack. "); }
private:
CompilerContext const& m_context;
unsigned stackHeight;