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Merge pull request #9748 from ethereum/fix-implicit-conversion-to-super

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Forbid implicit conversion from a contract to super
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chriseth 2020-09-08 16:22:35 +02:00 committed by GitHub
commit 3d5c84e19a
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4 changed files with 91 additions and 4 deletions
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1
Changelog.md
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@ -10,6 +10,7 @@ Compiler Features:
Bugfixes:
* Type Checker: Disallow ``virtual`` for modifiers in libraries.
* ViewPureChecker: Prevent visibility check on constructors.
* Type system: Fix internal error on implicit conversion of contract instance to the type of its ``super``.
### 0.7.1 (2020-09-02)

11
libsolidity/ast/Types.cpp
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@ -1569,12 +1569,15 @@ BoolResult ContractType::isImplicitlyConvertibleTo(Type const& _convertTo) const
return true;
if (_convertTo.category() == Category::Contract)
{
auto const& bases = contractDefinition().annotation().linearizedBaseContracts;
if (m_super && bases.size() <= 1)
auto const& targetContractType = dynamic_cast<ContractType const&>(_convertTo);
if (targetContractType.isSuper())
return false;
auto const& bases = contractDefinition().annotation().linearizedBaseContracts;
return find(
m_super ? ++bases.begin() : bases.begin(), bases.end(),
&dynamic_cast<ContractType const&>(_convertTo).contractDefinition()
bases.begin(),
bases.end(),
&targetContractType.contractDefinition()
) != bases.end();
}
return false;

27
test/libsolidity/syntaxTests/conversion/implicit_conversion_of_super_in_comparison.sol Normal file
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@ -0,0 +1,27 @@
contract D {}
contract C {
C c;
D d;
function foo() public {
// Current instance of the current contract vs super
super != this;
this != super;
// Different instance of the current contract vs super
super != c;
c != super;
// Instance of an unrelated contract vs super
super != d;
d != super;
}
}
// ----
// TypeError 2271: (144-157): Operator != not compatible with types contract super C and contract C
// TypeError 2271: (167-180): Operator != not compatible with types contract C and contract super C
// TypeError 2271: (254-264): Operator != not compatible with types contract super C and contract C
// TypeError 2271: (274-284): Operator != not compatible with types contract C and contract super C
// TypeError 2271: (349-359): Operator != not compatible with types contract super C and contract D
// TypeError 2271: (369-379): Operator != not compatible with types contract D and contract super C

56
test/libsolidity/syntaxTests/conversion/implicit_conversion_of_super_in_operators.sol Normal file
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@ -0,0 +1,56 @@
contract C {
function foo() public {
super << this;
super >> this;
super ^ this;
super | this;
super & this;
super * this;
super / this;
super % this;
super - this;
super + this;
super ** this;
super == this;
super != this;
super >= this;
super <= this;
super < this;
super > this;
super || this;
super && this;
super -= this;
super += this;
true ? super : this;
}
}
// ----
// TypeError 2271: (49-62): Operator << not compatible with types contract super C and contract C
// TypeError 2271: (72-85): Operator >> not compatible with types contract super C and contract C
// TypeError 2271: (95-107): Operator ^ not compatible with types contract super C and contract C
// TypeError 2271: (117-129): Operator | not compatible with types contract super C and contract C
// TypeError 2271: (139-151): Operator & not compatible with types contract super C and contract C
// TypeError 2271: (162-174): Operator * not compatible with types contract super C and contract C
// TypeError 2271: (184-196): Operator / not compatible with types contract super C and contract C
// TypeError 2271: (206-218): Operator % not compatible with types contract super C and contract C
// TypeError 2271: (228-240): Operator - not compatible with types contract super C and contract C
// TypeError 2271: (250-262): Operator + not compatible with types contract super C and contract C
// TypeError 2271: (272-285): Operator ** not compatible with types contract super C and contract C
// TypeError 2271: (296-309): Operator == not compatible with types contract super C and contract C
// TypeError 2271: (319-332): Operator != not compatible with types contract super C and contract C
// TypeError 2271: (342-355): Operator >= not compatible with types contract super C and contract C
// TypeError 2271: (365-378): Operator <= not compatible with types contract super C and contract C
// TypeError 2271: (388-400): Operator < not compatible with types contract super C and contract C
// TypeError 2271: (410-422): Operator > not compatible with types contract super C and contract C
// TypeError 2271: (433-446): Operator || not compatible with types contract super C and contract C
// TypeError 2271: (456-469): Operator && not compatible with types contract super C and contract C
// TypeError 4247: (480-485): Expression has to be an lvalue.
// TypeError 7366: (480-493): Operator -= not compatible with types contract super C and contract C
// TypeError 4247: (503-508): Expression has to be an lvalue.
// TypeError 7366: (503-516): Operator += not compatible with types contract super C and contract C
// TypeError 1080: (527-546): True expression's type contract super C does not match false expression's type contract C.