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Add sig member on function type

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This commit is contained in:
Alex Beregszaszi 2017-06-27 10:25:36 +01:00
parent 8bb96eaaf5
commit 58f7a27ee0
3 changed files with 14 additions and 1 deletions
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1
Changelog.md
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@ -1,6 +1,7 @@
### 0.4.17 (unreleased)
Features:
* Code Generator: Added ``.sig`` member on external function types to retrieve their signature.
* Optimizer: Add new optimization step to remove unused ``JUMPDEST``s.
* Type Checker: Display helpful warning for unused function arguments/return parameters.
* Type Checker: Do not show the same error multiple times for events.

5
libsolidity/ast/Types.cpp
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@ -2436,6 +2436,11 @@ MemberList::MemberMap FunctionType::nativeMembers(ContractDefinition const*) con
case Kind::BareDelegateCall:
{
MemberList::MemberMap members;
if (m_kind == Kind::External)
members.push_back(MemberList::Member(
"sig",
make_shared<FixedBytesType>(4)
));
if (m_kind != Kind::BareDelegateCall && m_kind != Kind::DelegateCall)
{
if (isPayable())

9
libsolidity/codegen/ExpressionCompiler.cpp
View File

@ -1068,7 +1068,14 @@ bool ExpressionCompiler::visit(MemberAccess const& _memberAccess)
solAssert(false, "Invalid member access to integer");
break;
case Type::Category::Function:
solAssert(!!_memberAccess.expression().annotation().type->memberType(member),
if (member == "sig")
{
m_context << Instruction::SWAP1 << Instruction::POP;
/// need to store store it as bytes4
utils().leftShiftNumberOnStack(224);
}
else
solAssert(!!_memberAccess.expression().annotation().type->memberType(member),
"Invalid member access to function.");
break;
case Type::Category::Magic: