Moves length check to reference resolver.

libsolidity/analysis/ReferencesResolver.cpp

@@ -231,6 +231,8 @@ void ReferencesResolver::endVisit(Mapping const& _typeName)
 void ReferencesResolver::endVisit(ArrayTypeName const& _typeName)
 {
 	TypePointer baseType = _typeName.baseType().annotation().type;
+	auto arrayType = dynamic_cast<ArrayType const*>(baseType.get());
+	bool isFixedSizeArray = (arrayType && arrayType->isByteArray()) || !baseType->isDynamicallySized();
 	if (!baseType)
 	{
 		solAssert(!m_errorReporter.errors().empty(), "");
@@ -246,6 +248,8 @@ void ReferencesResolver::endVisit(ArrayTypeName const& _typeName)
 		RationalNumberType const* lengthType = dynamic_cast<RationalNumberType const*>(lengthTypeGeneric.get());
 		if (!lengthType || !lengthType->mobileType())
 			fatalTypeError(length->location(), "Invalid array length, expected integer literal or constant expression.");
+		else if (lengthType->isZero() && isFixedSizeArray)
+			fatalTypeError(length->location(), "Array with zero length specified.");
 		else if (lengthType->isFractional())
 			fatalTypeError(length->location(), "Array with fractional length specified.");
 		else if (lengthType->isNegative())

libsolidity/analysis/TypeChecker.cpp

@@ -822,17 +822,12 @@ bool TypeChecker::visit(VariableDeclaration const& _variable)
 	{
 	case Type::Category::Array:
 		if (auto arrayType = dynamic_cast<ArrayType const*>(varType.get()))
-		{
 			if (
 				((arrayType->location() == DataLocation::Memory) ||
 				(arrayType->location() == DataLocation::CallData)) &&
 				!arrayType->validForCalldata()
 			)
 				m_errorReporter.typeError(_variable.location(), "Array is too large to be encoded.");
-			if (auto baseType = dynamic_cast<ArrayType const*>(arrayType->baseType().get()))
-				if (!baseType->isDynamicallySized() && baseType->length() == 0)
-					m_errorReporter.typeError(_variable.location(), "Fixed-size multidimensional arrays are not allowed to have zero length.");
-		}
 		break;
 	case Type::Category::Mapping:
 		if (auto mappingType = dynamic_cast<MappingType const*>(varType.get()))

test/libsolidity/syntaxTests/array/length/fixed_size_multidim_zero_length.sol

@@ -0,0 +1,15 @@
+contract C {
+  function a() public pure returns(int[0][500] memory) {}
+  function b() public pure returns(uint[0][500] memory) {}
+  function c() public pure returns(byte[0][500] memory) {}
+  function d() public pure returns(bytes32[0][500] memory) {}
+  function e() public pure returns(bytes[0][500] memory) {}
+  function e() public pure returns(string[0][500] memory) {}
+}
+// ----
+// TypeError: (52-53): Array with zero length specified.
+// TypeError: (111-112): Array with zero length specified.
+// TypeError: (170-171): Array with zero length specified.
+// TypeError: (232-233): Array with zero length specified.
+// TypeError: (292-293): Array with zero length specified.
+// TypeError: (353-354): Array with zero length specified.

test/libsolidity/syntaxTests/array/length/fixed_size_zero_length.sol

@@ -0,0 +1,15 @@
+contract C {
+  int[0] a;
+  uint[0] b;
+  byte[0] c;
+  bytes32[0] d;
+  bytes[0] e;
+  string[0] f;
+}
+// ----
+// TypeError: (19-20): Array with zero length specified.
+// TypeError: (32-33): Array with zero length specified.
+// TypeError: (45-46): Array with zero length specified.
+// TypeError: (61-62): Array with zero length specified.
+// TypeError: (75-76): Array with zero length specified.
+// TypeError: (90-91): Array with zero length specified.

test/libsolidity/syntaxTests/array/length/parentheses.sol

@@ -21,5 +21,5 @@ contract C {
     uint[((2) + 1) + 1] a12;
     uint[(2 + 1) + ((1))] a13;
     uint[(((2) + 1)) + (((1)))] a14;
-    uint[((((2) + 1)) + (((1))))%1] a15;
+    uint[((((3) + 1)) + (((1))))%2] a15;
 }

test/libsolidity/syntaxTests/array/multi_dim_zero_length.sol

@@ -1,6 +0,0 @@
-contract C {
-  bytes[0] a;
-  function f() public pure returns(bytes32[0][500] memory) {}
-}
-// ----
-// TypeError: (62-84): Fixed-size multidimensional arrays are not allowed to have zero length.

test/libsolidity/syntaxTests/parsing/arrays_in_storage.sol

@@ -1,6 +1,6 @@
 contract c {
     uint[10] a;
     uint[] a2;
-    struct x { uint[2**20] b; y[0] c; }
+    struct x { uint[2**20] b; y[1] c; }
     struct y { uint d; mapping(uint=>x)[] e; }
 }