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Merge pull request #3681 from ethereum/interface-external

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Allow overriding external functions in interfaces with public in a child
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chriseth 2018-03-27 15:47:59 +02:00 committed by GitHub
commit 62559cf127
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5 changed files with 33 additions and 0 deletions
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1
Changelog.md
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@ -2,6 +2,7 @@
Features:
* General: Support accessing dynamic return data in post-byzantium EVMs.
* Interfaces: Allow overriding external functions in interfaces with public in an implementing contract.
Bugfixes:
* Code Generator: Allow ``block.blockhash`` without being called.

9
libsolidity/analysis/TypeChecker.cpp
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@ -378,7 +378,16 @@ void TypeChecker::checkFunctionOverride(FunctionDefinition const& function, Func
function.annotation().superFunction = &super;
if (function.visibility() != super.visibility())
{
// visibility is enforced to be external in interfaces, but a contract can override that with public
if (
super.inContractKind() == ContractDefinition::ContractKind::Interface &&
function.inContractKind() != ContractDefinition::ContractKind::Interface &&
function.visibility() == FunctionDefinition::Visibility::Public
)
return;
overrideError(function, super, "Overriding function visibility differs.");
}
else if (function.stateMutability() != super.stateMutability())
overrideError(

7
libsolidity/ast/AST.cpp
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@ -290,6 +290,13 @@ TypeDeclarationAnnotation& EnumDefinition::annotation() const
return dynamic_cast<TypeDeclarationAnnotation&>(*m_annotation);
}
ContractDefinition::ContractKind FunctionDefinition::inContractKind() const
{
auto contractDef = dynamic_cast<ContractDefinition const*>(scope());
solAssert(contractDef, "Enclosing Scope of FunctionDefinition was not set.");
return contractDef->contractKind();
}
shared_ptr<FunctionType> FunctionDefinition::functionType(bool _internal) const
{
if (_internal)

2
libsolidity/ast/AST.h
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@ -624,6 +624,8 @@ public:
/// arguments separated by commas all enclosed in parentheses without any spaces.
std::string externalSignature() const;
ContractDefinition::ContractKind inContractKind() const;
virtual TypePointer type() const override;
/// @param _internal false indicates external interface is concerned, true indicates internal interface is concerned.

14
test/libsolidity/SolidityNameAndTypeResolution.cpp
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@ -6561,6 +6561,20 @@ BOOST_AUTO_TEST_CASE(using_interface_complex)
CHECK_SUCCESS(text);
}
BOOST_AUTO_TEST_CASE(interface_implement_public_contract)
{
char const* text = R"(
interface I {
function f() external;
}
contract C is I {
function f() public {
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(warn_about_throw)
{
char const* text = R"(