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Allow this.f.selector to be pure.

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This commit is contained in:
chriseth
2018-02-13 11:00:59 +01:00
parent 729c6a95f8
commit 5916cf1e0a
6 changed files with 89 additions and 9 deletions
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libsolidity/analysis/ViewPureChecker.cpp
+16
View File
@@ -275,6 +275,22 @@ void ViewPureChecker::endVisit(FunctionCall const& _functionCall)
reportMutability(mut, _functionCall.location());
}
bool ViewPureChecker::visit(MemberAccess const& _memberAccess)
{
// Catch the special case of `this.f.selector` which is a pure expression.
ASTString const& member = _memberAccess.memberName();
if (
_memberAccess.expression().annotation().type->category() == Type::Category::Function &&
member == "selector"
)
if (auto const* expr = dynamic_cast<MemberAccess const*>(&_memberAccess.expression()))
if (auto const* exprInt = dynamic_cast<Identifier const*>(&expr->expression()))
if (exprInt->name() == "this")
// Do not continue visiting.
return false;
return true;
}
void ViewPureChecker::endVisit(MemberAccess const& _memberAccess)
{
StateMutability mutability = StateMutability::Pure;
libsolidity/analysis/ViewPureChecker.h
+1
View File
@@ -56,6 +56,7 @@ private:
virtual bool visit(ModifierDefinition const& _modifierDef) override;
virtual void endVisit(ModifierDefinition const& _modifierDef) override;
virtual void endVisit(Identifier const& _identifier) override;
virtual bool visit(MemberAccess const& _memberAccess) override;
virtual void endVisit(MemberAccess const& _memberAccess) override;
virtual void endVisit(IndexAccess const& _indexAccess) override;
virtual void endVisit(ModifierInvocation const& _modifier) override;
libsolidity/codegen/ExpressionCompiler.cpp
+24
View File
@@ -1014,6 +1014,30 @@ bool ExpressionCompiler::visit(MemberAccess const& _memberAccess)
_memberAccess.expression().accept(*this);
return false;
}
// Another special case for `this.f.selector` which does not need the address.
// There are other uses of `.selector` which do need the address, but we want this
// specific use to be a pure expression.
if (
_memberAccess.expression().annotation().type->category() == Type::Category::Function &&
member == "selector"
)
if (auto const* expr = dynamic_cast<MemberAccess const*>(&_memberAccess.expression()))
if (auto const* exprInt = dynamic_cast<Identifier const*>(&expr->expression()))
if (exprInt->name() == "this")
if (Declaration const* declaration = expr->annotation().referencedDeclaration)
{
u256 identifier;
if (auto const* variable = dynamic_cast<VariableDeclaration const*>(declaration))
identifier = FunctionType(*variable).externalIdentifier();
else if (auto const* function = dynamic_cast<FunctionDefinition const*>(declaration))
identifier = FunctionType(*function).externalIdentifier();
else
solAssert(false, "Contract member is neither variable nor function.");
m_context << identifier;
/// need to store store it as bytes4
utils().leftShiftNumberOnStack(224);
return false;
}
_memberAccess.expression().accept(*this);
switch (_memberAccess.expression().annotation().type->category())