Merge pull request #9422 from ethereum/typeCheckerFunctionNamedArgsFix

[TypeChecker] Do not allow function application with named arguments on the result of a conditional operator

Changelog.md

@@ -32,6 +32,7 @@ Bugfixes:
  * NatSpec: Constructors and functions have consistent userdoc output.
  * Inheritance: Disallow public state variables overwriting ``pure`` functions.
  * State Mutability: Constant public state variables are considered ``pure`` functions.
+ * Type Checker: Fixing deduction issues on function types when function call has named arguments.
 
 
 ### 0.6.12 (2020-07-22)

libsolidity/analysis/TypeChecker.cpp

@@ -1293,9 +1293,9 @@ bool TypeChecker::visit(Conditional const& _conditional)
 
 	if (_conditional.annotation().willBeWrittenTo)
 		m_errorReporter.typeError(
-				2212_error,
-				_conditional.location(),
-				"Conditional expression as left value is not supported yet."
+			2212_error,
+			_conditional.location(),
+			"Conditional expression as left value is not supported yet."
 		);
 
 	return false;

libsolidity/ast/Types.cpp

@@ -3425,6 +3425,28 @@ TypeResult FunctionType::interfaceType(bool /*_inLibrary*/) const
 		return TypeResult::err("Internal type is not allowed for public or external functions.");
 }
 
+TypePointer FunctionType::mobileType() const
+{
+	if (m_valueSet || m_gasSet || m_saltSet || m_bound)
+		return nullptr;
+
+	// return function without parameter names
+	return TypeProvider::function(
+		m_parameterTypes,
+		m_returnParameterTypes,
+		strings(m_parameterTypes.size()),
+		strings(m_returnParameterNames.size()),
+		m_kind,
+		m_arbitraryParameters,
+		m_stateMutability,
+		m_declaration,
+		m_gasSet,
+		m_valueSet,
+		m_bound,
+		m_saltSet
+	);
+}
+
 bool FunctionType::canTakeArguments(
 	FuncCallArguments const& _arguments,
 	Type const* _selfType

libsolidity/ast/Types.h

@@ -1234,6 +1234,7 @@ public:
 	MemberList::MemberMap nativeMembers(ASTNode const* _currentScope) const override;
 	TypePointer encodingType() const override;
 	TypeResult interfaceType(bool _inLibrary) const override;
+	TypePointer mobileType() const override;
 
 	/// @returns TypePointer of a new FunctionType object. All input/return parameters are an
 	/// appropriate external types (i.e. the interfaceType()s) of input/return parameters of

test/libsolidity/semanticTests/functionCall/conditional_with_arguments.sol

@@ -0,0 +1,12 @@
+contract C {
+    function g(int x, int y) public pure returns (int) { return x - y; }
+    function h(int y, int x) public pure returns (int) { return y - x; }
+
+    function f() public pure returns (int) {
+        return (false ? g : h)(2, 1);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// f() -> 1

test/libsolidity/semanticTests/functionTypes/inline_array_with_value_call_option.sol

@@ -0,0 +1,10 @@
+contract C {
+    function f() external payable returns (uint) { assert(msg.value > 0); return 1; }
+    function g() external payable returns (uint) { assert(msg.value > 0); return 2; }
+
+    function h() public payable returns (uint) {
+        return [this.f, this.g][0]{value: 1}();
+    }
+}
+// ----
+// h(), 1 ether -> 1

test/libsolidity/syntaxTests/functionCalls/invalid_named_arguments_conditional.sol

@@ -0,0 +1,14 @@
+contract C {
+    function g(int x, int y) public pure returns (int) { return x - y; }
+    function h(int y, int x) public pure returns (int) { return y - x; }
+
+    function f() public pure {
+        (true ? g : h)({x : 1, y : 2});
+        [g, h][1]({x : 1, y : 2});
+    }
+}
+// ----
+// TypeError 4974: (199-229): Named argument "x" does not match function declaration.
+// TypeError 4974: (199-229): Named argument "y" does not match function declaration.
+// TypeError 4974: (239-264): Named argument "x" does not match function declaration.
+// TypeError 4974: (239-264): Named argument "y" does not match function declaration.

test/libsolidity/syntaxTests/functionTypes/function_type_named_call.sol

@@ -0,0 +1,9 @@
+contract C {
+    function f() pure public {
+        function(uint a) returns (uint) x;
+        x({a:2});
+    }
+}
+// ----
+// Warning 6162: (61-67): Naming function type parameters is deprecated.
+// TypeError 4974: (95-103): Named argument "a" does not match function declaration.

test/libsolidity/syntaxTests/functionTypes/inline_array_with_bound_function.sol

@@ -0,0 +1,13 @@
+library L {
+    function f(uint a) internal pure {}
+    function g(uint a) internal pure {}
+}
+contract C {
+    using L for *;
+    function f() pure public {
+        uint t = 8;
+        [t.f, t.g][0]();
+    }
+}
+// ----
+// TypeError 9563: (186-189): Invalid mobile type.

test/libsolidity/syntaxTests/functionTypes/inline_array_with_bound_function_mixed.sol

@@ -0,0 +1,13 @@
+library L {
+    function f(uint a) internal pure {}
+}
+contract C {
+    using L for *;
+    function f() pure public {
+        uint t;
+        function() pure x;
+        [t.f, x][0]({a: 8});
+    }
+}
+// ----
+// TypeError 9563: (169-172): Invalid mobile type.

test/libsolidity/syntaxTests/functionTypes/inline_array_with_payable_function.sol

@@ -0,0 +1,13 @@
+contract D {
+    function f(uint a) external payable {}
+    function g(uint a) external {}
+}
+
+contract C {
+    function f() public {
+        D d;
+        [d.f{value: 1}, d.g][0](8);
+    }
+}
+// ----
+// TypeError 9563: (155-168): Invalid mobile type.

test/libsolidity/syntaxTests/functionTypes/ternary_with_bound_functions.sol

@@ -0,0 +1,14 @@
+library L {
+    function f(uint a) internal pure {}
+    function g(uint a) internal pure {}
+}
+contract C {
+    using L for *;
+    function f(bool x) pure public {
+        uint t = 8;
+        (x ? t.f : t.g)();
+    }
+}
+// ----
+// TypeError 9717: (196-199): Invalid mobile type in true expression.
+// TypeError 3703: (202-205): Invalid mobile type in false expression.