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https://github.com/ethereum/solidity
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Merge pull request #7221 from ethereum/calldataLValueError
Allow writing to value-type arguments in external functions + Better error messages on attempted writes to calldata.
This commit is contained in:
commit
e946b7ab34
@ -1,6 +1,7 @@
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### 0.5.12 (unreleased)
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Language Features:
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* Type Checker: Allow assignment to external function arguments except for reference types.
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Compiler Features:
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@ -2515,8 +2515,47 @@ void TypeChecker::requireLValue(Expression const& _expression)
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_expression.annotation().lValueRequested = true;
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_expression.accept(*this);
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if (_expression.annotation().isLValue)
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return;
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return m_errorReporter.typeError(_expression.location(), [&]() {
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if (_expression.annotation().isConstant)
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m_errorReporter.typeError(_expression.location(), "Cannot assign to a constant variable.");
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else if (!_expression.annotation().isLValue)
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m_errorReporter.typeError(_expression.location(), "Expression has to be an lvalue.");
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return "Cannot assign to a constant variable.";
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if (auto indexAccess = dynamic_cast<IndexAccess const*>(&_expression))
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{
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if (type(indexAccess->baseExpression())->category() == Type::Category::FixedBytes)
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return "Single bytes in fixed bytes arrays cannot be modified.";
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else if (auto arrayType = dynamic_cast<ArrayType const*>(type(indexAccess->baseExpression())))
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if (arrayType->dataStoredIn(DataLocation::CallData))
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return "Calldata arrays are read-only.";
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}
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if (auto memberAccess = dynamic_cast<MemberAccess const*>(&_expression))
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{
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if (auto structType = dynamic_cast<StructType const*>(type(memberAccess->expression())))
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{
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if (structType->dataStoredIn(DataLocation::CallData))
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return "Calldata structs are read-only.";
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}
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else if (auto arrayType = dynamic_cast<ArrayType const*>(type(memberAccess->expression())))
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if (memberAccess->memberName() == "length")
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switch (arrayType->location())
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{
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case DataLocation::Memory:
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return "Memory arrays cannot be resized.";
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case DataLocation::CallData:
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return "Calldata arrays cannot be resized.";
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case DataLocation::Storage:
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break;
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}
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}
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if (auto identifier = dynamic_cast<Identifier const*>(&_expression))
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if (auto varDecl = dynamic_cast<VariableDeclaration const*>(identifier->annotation().referencedDeclaration))
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if (varDecl->isExternalCallableParameter() && dynamic_cast<ReferenceType const*>(identifier->annotation().type))
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return "External function arguments of reference type are read-only.";
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return "Expression has to be an lvalue.";
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}());
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}
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@ -432,8 +432,13 @@ string Scopable::sourceUnitName() const
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bool VariableDeclaration::isLValue() const
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{
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// External function parameters and constant declared variables are Read-Only
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return !isExternalCallableParameter() && !m_isConstant;
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// Constant declared variables are Read-Only
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if (m_isConstant)
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return false;
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// External function arguments of reference type are Read-Only
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if (isExternalCallableParameter() && dynamic_cast<ReferenceType const*>(type()))
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return false;
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return true;
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}
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bool VariableDeclaration::isLocalVariable() const
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@ -0,0 +1,9 @@
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contract C {
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function f(uint256 x) public pure returns (uint256, uint256) {
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uint256 b = x;
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x = 42;
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return (x, b);
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}
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}
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// ----
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// f(uint256): 23 -> 42, 23
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7
test/libsolidity/syntaxTests/array/calldata_assign.sol
Normal file
7
test/libsolidity/syntaxTests/array/calldata_assign.sol
Normal file
@ -0,0 +1,7 @@
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pragma experimental ABIEncoderV2;
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contract Test {
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function f(uint256[] calldata s) external { s[0] = 4; }
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}
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// ----
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// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
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// TypeError: (98-102): Calldata arrays are read-only.
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7
test/libsolidity/syntaxTests/array/calldata_resize.sol
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7
test/libsolidity/syntaxTests/array/calldata_resize.sol
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@ -0,0 +1,7 @@
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contract C {
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function f (uint256[] calldata x) external pure {
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x.length = 42;
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}
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}
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// ----
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// TypeError: (75-83): Calldata arrays cannot be resized.
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@ -0,0 +1,7 @@
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contract C {
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function f(uint256[] calldata x) external pure {
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x[0] = 42;
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}
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}
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// ----
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// TypeError: (74-78): Calldata arrays are read-only.
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@ -0,0 +1,10 @@
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pragma experimental ABIEncoderV2;
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contract C {
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struct S { uint256 x; }
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function f(S calldata s) external pure {
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s.x = 42;
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}
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}
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// ----
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// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
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// TypeError: (128-131): Calldata structs are read-only.
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@ -0,0 +1,7 @@
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contract C {
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function f(uint256[] calldata x, uint256[] calldata y) external pure {
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x = y;
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}
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}
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// ----
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// TypeError: (96-97): External function arguments of reference type are read-only.
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15
test/libsolidity/syntaxTests/lvalues/functions.sol
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15
test/libsolidity/syntaxTests/lvalues/functions.sol
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@ -0,0 +1,15 @@
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contract C {
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function f() internal {
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}
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function g() internal {
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g = f;
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}
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function h() external {
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}
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function i() external {
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this.i = this.h;
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}
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}
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// ----
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// TypeError: (83-84): Expression has to be an lvalue.
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// TypeError: (166-172): Expression has to be an lvalue.
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7
test/libsolidity/syntaxTests/lvalues/library_mapping.sol
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7
test/libsolidity/syntaxTests/lvalues/library_mapping.sol
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@ -0,0 +1,7 @@
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library L {
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function f(mapping(uint=>uint) storage x, mapping(uint=>uint) storage y) external {
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x = y;
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}
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}
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// ----
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// TypeError: (108-109): Mappings cannot be assigned to.
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31
test/libsolidity/syntaxTests/lvalues/valid_lvalues.sol
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31
test/libsolidity/syntaxTests/lvalues/valid_lvalues.sol
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@ -0,0 +1,31 @@
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contract C {
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struct S { uint256 x; }
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function i() internal pure {}
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function e() external pure {}
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uint[] s1;
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function f(uint x, bytes32 y) external {
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x = 42;
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y = bytes32(0);
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(x, y) = (23, bytes32(0));
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S memory ms1;
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S memory ms2;
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ms1 = ms2;
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ms1.x = x;
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uint256[] memory a = new uint256[](2);
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uint256[] memory b = new uint256[](3);
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a = b;
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a[0] = x;
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s1[0] = x;
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s1 = a;
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}
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function g(function() internal pure x) internal view {
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x = i;
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function(uint, bytes32) external y;
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y = this.f;
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}
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function g(function() external pure x) external view {
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x = this.e;
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function(function() internal pure) internal view y;
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y = g;
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}
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}
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@ -1,5 +1,4 @@
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contract c {
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function f(uint a) external { a = 1; }
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function f(uint a) external pure { a = 1; }
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}
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// ----
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// TypeError: (47-48): Expression has to be an lvalue.
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@ -1,5 +1,4 @@
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contract c {
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function f(uint a) external { a++; }
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function f(uint a) external pure { a++; }
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}
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// ----
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// TypeError: (47-48): Expression has to be an lvalue.
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@ -2,4 +2,4 @@ contract c {
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function f(uint a) external { delete a; }
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}
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// ----
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// TypeError: (54-55): Expression has to be an lvalue.
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// Warning: (17-58): Function state mutability can be restricted to pure
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@ -5,4 +5,4 @@ contract C {
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}
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}
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// ----
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// TypeError: (72-80): Expression has to be an lvalue.
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// TypeError: (72-80): Memory arrays cannot be resized.
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@ -7,4 +7,4 @@ contract Test {
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}
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// ----
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// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
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// TypeError: (144-147): Expression has to be an lvalue.
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// TypeError: (144-147): Calldata structs are read-only.
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@ -5,4 +5,4 @@ contract Test {
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}
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// ----
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// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
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// TypeError: (114-117): Expression has to be an lvalue.
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// TypeError: (114-117): Calldata structs are read-only.
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@ -6,7 +6,7 @@ contract Test {
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}
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// ----
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// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
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// TypeError: (114-115): Expression has to be an lvalue.
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// TypeError: (114-115): External function arguments of reference type are read-only.
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// TypeError: (118-122): Type struct Test.S memory is not implicitly convertible to expected type struct Test.S calldata.
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// TypeError: (178-179): Expression has to be an lvalue.
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// TypeError: (178-179): External function arguments of reference type are read-only.
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// TypeError: (182-183): Type struct Test.S memory is not implicitly convertible to expected type struct Test.S calldata.
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@ -0,0 +1,8 @@
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contract C {
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function f() public pure {
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bytes32 x;
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x[0] = 0x42;
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}
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}
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// ----
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// TypeError: (71-75): Single bytes in fixed bytes arrays cannot be modified.
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