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Equality operator allowed for external function types

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This commit is contained in:
nishant-sachdeva 2021-12-16 17:05:39 +05:30
parent a07b3ec70f
commit a0d6c11860
11 changed files with 244 additions and 12 deletions
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1
Changelog.md
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@ -2,6 +2,7 @@
Language Features:
* General: Support ``ContractName.functionName`` for ``abi.encodeCall``, in addition to external function pointers.
* General: Add equality-comparison operators for external function types.
Compiler Features:

12
libsolidity/ast/Types.cpp
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@ -3018,8 +3018,18 @@ TypeResult FunctionType::binaryOperatorResult(Token _operator, Type const* _othe
if (_other->category() != category() || !(_operator == Token::Equal || _operator == Token::NotEqual))
return nullptr;
FunctionType const& other = dynamic_cast<FunctionType const&>(*_other);
if (kind() == Kind::Internal && other.kind() == Kind::Internal && sizeOnStack() == 1 && other.sizeOnStack() == 1)
if (kind() == Kind::Internal && sizeOnStack() == 1 && other.kind() == Kind::Internal && other.sizeOnStack() == 1)
return commonType(this, _other);
else if (
kind() == Kind::External &&
sizeOnStack() == 2 &&
!bound() &&
other.kind() == Kind::External &&
other.sizeOnStack() == 2 &&
!other.bound()
)
return commonType(this, _other);
return nullptr;
}

26
libsolidity/codegen/ExpressionCompiler.cpp
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@ -2278,12 +2278,29 @@ void ExpressionCompiler::appendAndOrOperatorCode(BinaryOperation const& _binaryO
void ExpressionCompiler::appendCompareOperatorCode(Token _operator, Type const& _type)
{
solAssert(_type.sizeOnStack() == 1, "Comparison of multi-slot types.");
if (_operator == Token::Equal || _operator == Token::NotEqual)
{
if (FunctionType const* funType = dynamic_cast<decltype(funType)>(&_type))
FunctionType const* functionType = dynamic_cast<decltype(functionType)>(&_type);
if (functionType && functionType->kind() == FunctionType::Kind::External)
{
if (funType->kind() == FunctionType::Kind::Internal)
solUnimplementedAssert(functionType->sizeOnStack() == 2, "");
m_context << Instruction::SWAP3;
m_context << ((u256(1) << 160) - 1) << Instruction::AND;
m_context << Instruction::SWAP1;
m_context << ((u256(1) << 160) - 1) << Instruction::AND;
m_context << Instruction::EQ;
m_context << Instruction::SWAP2;
m_context << ((u256(1) << 32) - 1) << Instruction::AND;
m_context << Instruction::SWAP1;
m_context << ((u256(1) << 32) - 1) << Instruction::AND;
m_context << Instruction::EQ;
m_context << Instruction::AND;
}
else
{
solAssert(_type.sizeOnStack() == 1, "Comparison of multi-slot types.");
if (functionType && functionType->kind() == FunctionType::Kind::Internal)
{
// We have to remove the upper bits (construction time value) because they might
// be "unknown" in one of the operands and not in the other.
@ -2291,13 +2308,14 @@ void ExpressionCompiler::appendCompareOperatorCode(Token _operator, Type const&
m_context << Instruction::SWAP1;
m_context << ((u256(1) << 32) - 1) << Instruction::AND;
}
}
m_context << Instruction::EQ;
}
if (_operator == Token::NotEqual)
m_context << Instruction::ISZERO;
}
else
{
solAssert(_type.sizeOnStack() == 1, "Comparison of multi-slot types.");
bool isSigned = false;
if (auto type = dynamic_cast<IntegerType const*>(&_type))
isSigned = type->isSigned();

29
libsolidity/codegen/YulUtilFunctions.cpp
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@ -29,6 +29,7 @@
#include <libsolutil/FunctionSelector.h>
#include <libsolutil/Whiskers.h>
#include <libsolutil/StringUtils.h>
#include <libsolidity/ast/TypeProvider.h>
using namespace std;
using namespace solidity;
@ -4548,3 +4549,31 @@ string YulUtilFunctions::externalCodeFunction()
.render();
});
}
std::string YulUtilFunctions::externalFunctionPointersEqualFunction()
{
std::string const functionName = "externalFunctionPointersEqualFunction";
return m_functionCollector.createFunction(functionName, [&]() {
return util::Whiskers(R"(
function <functionName>(
leftAddress,
leftSelector,
rightAddress,
rightSelector
) -> result {
result := and(
eq(
<addressCleanUpFunction>(leftAddress), <addressCleanUpFunction>(rightAddress)
),
eq(
<selectorCleanUpFunction>(leftSelector), <selectorCleanUpFunction>(rightSelector)
)
)
}
)")
("functionName", functionName)
("addressCleanUpFunction", cleanupFunction(*TypeProvider::address()))
("selectorCleanUpFunction", cleanupFunction(*TypeProvider::uint(32)))
.render();
});
}

3
libsolidity/codegen/YulUtilFunctions.h
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@ -522,6 +522,9 @@ public:
/// Signature: (address) -> mpos
std::string externalCodeFunction();
/// @return the name of a function that that checks if two external functions pointers are equal or not
std::string externalFunctionPointersEqualFunction();
private:
/// @returns the name of a function that copies a struct from calldata or memory to storage
/// signature: (slot, value) ->

26
libsolidity/codegen/ir/IRGeneratorForStatements.cpp
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@ -799,13 +799,8 @@ bool IRGeneratorForStatements::visit(BinaryOperation const& _binOp)
if (TokenTraits::isCompareOp(op))
{
if (auto type = dynamic_cast<FunctionType const*>(commonType))
{
solAssert(op == Token::Equal || op == Token::NotEqual, "Invalid function pointer comparison!");
solAssert(type->kind() != FunctionType::Kind::External, "External function comparison not allowed!");
}
solAssert(commonType->isValueType(), "");
bool isSigned = false;
if (auto type = dynamic_cast<IntegerType const*>(commonType))
isSigned = type->isSigned();
@ -813,8 +808,25 @@ bool IRGeneratorForStatements::visit(BinaryOperation const& _binOp)
string args = expressionAsType(_binOp.leftExpression(), *commonType, true);
args += ", " + expressionAsType(_binOp.rightExpression(), *commonType, true);
auto functionType = dynamic_cast<FunctionType const*>(commonType);
solAssert(functionType ? (op == Token::Equal || op == Token::NotEqual) : true, "Invalid function pointer comparison!");
string expr;
if (op == Token::Equal)
if (functionType && functionType->kind() == FunctionType::Kind::External)
{
solUnimplementedAssert(functionType->sizeOnStack() == 2, "");
expr = m_utils.externalFunctionPointersEqualFunction() +
"(" +
IRVariable{_binOp.leftExpression()}.part("address").name() + "," +
IRVariable{_binOp.leftExpression()}.part("functionSelector").name() + "," +
IRVariable{_binOp.rightExpression()}.part("address").name() + "," +
IRVariable{_binOp.rightExpression()}.part("functionSelector").name() +
")";
if (op == Token::NotEqual)
expr = "iszero(" + expr + ")";
}
else if (op == Token::Equal)
expr = "eq(" + move(args) + ")";
else if (op == Token::NotEqual)
expr = "iszero(eq(" + move(args) + "))";

17
test/libsolidity/semanticTests/functionTypes/comparison_operator_for_external_function_cleans_dirty_bits.sol Normal file
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@ -0,0 +1,17 @@
contract C {
function g() external {}
function comparison_operators_for_external_function_pointers_with_dirty_bits() external returns (bool) {
function() external g_ptr_dirty = this.g;
assembly {
g_ptr_dirty.address := or(g_ptr_dirty.address, shl(160, sub(0,1)))
g_ptr_dirty.selector := or(g_ptr_dirty.selector, shl(32, sub(0,1)))
}
function() external g_ptr = this.g;
return g_ptr == g_ptr_dirty;
}
}
// ====
// compileViaYul: also
// EVMVersion: >=constantinople
// ----
// comparison_operators_for_external_function_pointers_with_dirty_bits() -> true

81
test/libsolidity/semanticTests/functionTypes/comparison_operators_for_external_functions.sol Normal file
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@ -0,0 +1,81 @@
contract C {
function f() external {}
function g() external {}
function h() pure external {}
function i() view external {}
function comparison_operators_for_external_functions() public returns (bool) {
assert(
this.f != this.g &&
this.f != this.h &&
this.f != this.i &&
this.g != this.h &&
this.g != this.i &&
this.h != this.i &&
this.f == this.f &&
this.g == this.g &&
this.h == this.h &&
this.i == this.i
);
return true;
}
function comparison_operators_for_local_external_function_pointers() public returns (bool) {
function () external f_local = this.f;
function () external g_local = this.g;
function () external pure h_local = this.h;
function () external view i_local = this.i;
assert(
f_local == this.f &&
g_local == this.g &&
h_local == this.h &&
i_local == this.i &&
f_local != this.g &&
f_local != this.h &&
f_local != this.i &&
g_local != this.f &&
g_local != this.h &&
g_local != this.i &&
h_local != this.f &&
h_local != this.g &&
h_local != this.i &&
i_local != this.f &&
i_local != this.g &&
i_local != this.h
);
assert(
f_local == f_local &&
f_local != g_local &&
f_local != h_local &&
f_local != i_local
);
assert(
g_local == g_local &&
g_local != h_local &&
g_local != i_local
);
assert(
h_local == h_local &&
i_local == i_local &&
h_local != i_local
);
return true;
}
}
// ====
// compileViaYul: also
// ----
// comparison_operators_for_external_functions() -> true
// comparison_operators_for_local_external_function_pointers() -> true

12
test/libsolidity/syntaxTests/functionTypes/comparison_operator_for_external_functions_with_extra_gas_slots.sol Normal file
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@ -0,0 +1,12 @@
contract C {
function external_test_function() external {}
function comparison_operator_for_external_function_with_extra_slots() external returns (bool) {
return (
(this.external_test_function{gas: 4} == this.external_test_function) &&
(this.external_test_function{gas: 4} == this.external_test_function{gas: 4})
);
}
}
// ----
// TypeError 2271: (193-259): Operator == not compatible with types function () external and function () external
// TypeError 2271: (277-351): Operator == not compatible with types function () external and function () external

23
test/libsolidity/syntaxTests/functionTypes/comparison_operators_between_internal_and_external_function_pointers.sol Normal file
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@ -0,0 +1,23 @@
contract C {
function external_test_function() external {}
function internal_test_function() internal {}
function comparison_operator_between_internal_and_external_function_pointers() external returns (bool) {
function () external external_function_pointer_local = this.external_test_function;
function () internal internal_function_pointer_local = internal_test_function;
assert(
this.external_test_function == external_function_pointer_local &&
internal_function_pointer_local == internal_test_function
);
assert(
internal_function_pointer_local != external_function_pointer_local &&
internal_test_function != this.external_test_function
);
return true;
}
}
// ----
// TypeError 2271: (606-672): Operator != not compatible with types function () and function () external
// TypeError 2271: (688-741): Operator != not compatible with types function () and function () external

26
test/libsolidity/syntaxTests/functionTypes/comparison_operators_external_functions_with_different_parameters.sol Normal file
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@ -0,0 +1,26 @@
contract C {
function external_test_function1(uint num) external {}
function external_test_function2(bool val) external {}
function comparison_operator_between_internal_and_external_function_pointers() external returns (bool) {
function () external external_function_pointer_local1 = this.external_test_function1;
function () external external_function_pointer_local2 = this.external_test_function2;
assert(
this.external_test_function1 == external_function_pointer_local1 &&
this.external_test_function2 == external_function_pointer_local2
);
assert(
external_function_pointer_local2 != external_function_pointer_local1 &&
this.external_test_function2 != this.external_test_function1
);
return true;
}
}
// ----
// TypeError 9574: (249-333): Type function (uint256) external is not implicitly convertible to expected type function () external.
// TypeError 9574: (343-427): Type function (bool) external is not implicitly convertible to expected type function () external.
// TypeError 2271: (458-522): Operator == not compatible with types function (uint256) external and function () external
// TypeError 2271: (538-602): Operator == not compatible with types function (bool) external and function () external
// TypeError 2271: (726-786): Operator != not compatible with types function (bool) external and function (uint256) external