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[SMTChecker] Support type(I).interfaceId

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This commit is contained in:
Alex Beregszaszi 2020-09-11 19:37:34 +01:00
parent 552a5f0913
commit 83934254ea
3 changed files with 42 additions and 1 deletions
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2
Changelog.md
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@ -6,7 +6,7 @@ Language Features:
Compiler Features:
* SMTChecker: Support shifts.
* SMTChecker: Support structs.
* SMTChecker: Support ``type(T).min`` and ``type(T).max``.
* SMTChecker: Support ``type(T).min``, ``type(T).max``, and ``type(I).interfaceId``.
* Yul Optimizer: Prune unused parameters in functions.
* Yul Optimizer: Inline into functions further down in the call graph first.
* Yul Optimizer: Try to simplify function names.

9
libsolidity/formal/SMTEncoder.cpp
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@ -888,6 +888,15 @@ bool SMTEncoder::visit(MemberAccess const& _memberAccess)
IntegerType const& integerType = dynamic_cast<IntegerType const&>(*magicType->typeArgument());
defineExpr(_memberAccess, memberName == "min" ? integerType.minValue() : integerType.maxValue());
}
else if (memberName == "interfaceId")
{
// TODO: move this calculation into ContractDefinition and share with ExpressionCompiler
ContractDefinition const& contract = dynamic_cast<ContractType const&>(*magicType->typeArgument()).contractDefinition();
uint64_t result{0};
for (auto const& function: contract.interfaceFunctionList(false))
result ^= fromBigEndian<uint64_t>(function.first.ref());
defineExpr(_memberAccess, result);
}
else
// NOTE: supporting name, creationCode, runtimeCode would be easy enough, but the bytes/string they return are not
// at all useable in the SMT checker currently

32
test/libsolidity/smtCheckerTests/types/type_interfaceid.sol Normal file
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@ -0,0 +1,32 @@
pragma experimental SMTChecker;
interface I1 {
}
interface I2 {
function f() external;
}
interface I3 {
function f() external;
function g(uint, address) external;
}
contract C {
function f() public pure {
assert(type(I1).interfaceId == 0);
assert(type(I2).interfaceId != 0);
assert(type(I2).interfaceId == 0x26121ff0);
assert(type(I2).interfaceId != 0);
assert(type(I3).interfaceId == 0x822b51c6);
}
function g() public pure {
assert(type(I1).interfaceId == type(I2).interfaceId);
}
function h() public pure {
assert(type(I2).interfaceId == type(I3).interfaceId);
}
}
// ----
// Warning 6328: (449-501): Assertion violation happens here.
// Warning 6328: (536-588): Assertion violation happens here.