public override JSExpression Translate(ILBlockTranslator translator, JSExpression[] arguments)
{
return(JSCastExpression.New(
arguments[1],
TargetType,
translator.TypeSystem
));
}
private JSBinaryOperatorExpression MakeUnaryMutation(
JSExpression expressionToMutate, JSBinaryOperator mutationOperator,
TypeReference type
)
{
var newValue = new JSBinaryOperatorExpression(
mutationOperator, expressionToMutate, JSLiteral.New(1),
TypeSystem.Int32
);
var assignment = new JSBinaryOperatorExpression(
JSOperator.Assignment,
expressionToMutate, JSCastExpression.New(
newValue, type, TypeSystem, true
), type
);
return(assignment);
}
public static JSExpression CastToEnumType(JSExpression value, TypeReference type, TypeSystem typeSystem)
{
if (IsNullableEnum(type))
{
// Handle casts like <int> -> <Enum?> by doing a two stage cast:
// <int> -> <Enum> -> <Enum?>
// Issue #154
var git = (GenericInstanceType)type;
var casted = JSCastExpression.New(
value, git.GenericArguments[0], typeSystem, true
);
var coerced = JSChangeTypeExpression.New(
casted, type, typeSystem
);
return(coerced);
}
else
{
return(JSCastExpression.New(
value, type, typeSystem, true
));
}
}
public void VisitNode(JSCastExpression ce)
{
var currentType = ce.Expression.GetActualType(TypeSystem);
var targetType = ce.NewType;
JSExpression newExpression = null;
var innerCast = ce.Expression as JSCastExpression;
if (targetType.FullName == "System.ValueType")
{
var replacement = ce.Expression;
ParentNode.ReplaceChild(ce, replacement);
VisitReplacement(replacement);
return;
}
else if (
TypeUtil.IsIntegralOrEnum(currentType) &&
(targetType.MetadataType == MetadataType.Char)
)
{
newExpression = JSInvocationExpression.InvokeStatic(
JS.fromCharCode, new[] { ce.Expression }, true
);
}
else if (
(currentType.MetadataType == MetadataType.Char) &&
TypeUtil.IsIntegral(targetType)
)
{
newExpression = JSInvocationExpression.InvokeMethod(
JS.charCodeAt, ce.Expression, new[] { JSLiteral.New(0) }, true
);
}
else if (
IntroduceEnumCasts.IsEnumOrNullableEnum(currentType)
)
{
TypeInfo enumInfo;
var isNullable = TypeUtil.IsNullable(currentType);
if (isNullable)
{
int temp;
var git = (GenericInstanceType)TypeUtil.FullyDereferenceType(currentType, out temp);
enumInfo = TypeInfo.Get(git.GenericArguments[0]);
}
else
{
enumInfo = TypeInfo.Get(currentType);
}
if (enumInfo == null)
{
throw new InvalidOperationException("Unable to extract enum type from typereference " + currentType);
}
if (targetType.MetadataType == MetadataType.Boolean)
{
newExpression = new JSBinaryOperatorExpression(
JSOperator.NotEqual,
JSCastExpression.New(ce.Expression, TypeSystem.Int32, TypeSystem, true, true),
new JSIntegerLiteral(0, typeof(Int32)),
TypeSystem.Boolean
);
}
else if (TypeUtil.IsNumeric(targetType))
{
if (isNullable)
{
newExpression = new JSNullableCastExpression(ce.Expression, new JSType(targetType));
}
else if (
ce.Expression is JSCastExpression &&
(((JSCastExpression)ce.Expression).Expression.GetActualType(TypeSystem).MetadataType == MetadataType.Int64 ||
((JSCastExpression)ce.Expression).Expression.GetActualType(TypeSystem).MetadataType == MetadataType.UInt64)
)
{
newExpression = ce.Expression;
}
else
{
newExpression = JSInvocationExpression.InvokeMethod(
JS.valueOf(targetType), ce.Expression, null, true
);
}
}
else if (targetType.FullName == "System.Enum")
{
newExpression = ce.Expression;
}
else
{
// Debugger.Break();
}
}
else if (
(targetType.MetadataType == MetadataType.Boolean) &&
(ce.Expression is JSAsExpression) &&
((JSAsExpression)ce.Expression).GetActualType(TypeSystem) is GenericParameter
)
{
// C# expressions such as (t is T) (where T is a generic parameter). See issue #150.
// Tested with AsWithGenericParameter.cs
newExpression = new JSBinaryOperatorExpression(
JSOperator.NotEqual,
ce.Expression, new JSNullLiteral(currentType),
TypeSystem.Boolean
);
}
else if (
(targetType.MetadataType == MetadataType.Boolean) &&
// A cast from Object to Boolean can occur in two forms:
// An implied conversion, where an object expression is treated as a boolean (logicnot operation, etc).
// In this case, we want to do 'obj != null' to make it a boolean.
// An explicit conversion, where an object expression is unboxed to boolean.
// In this case we want to leave it as-is.
(ce.IsCoercion || (currentType.FullName != "System.Object"))
)
{
newExpression = new JSBinaryOperatorExpression(
JSOperator.NotEqual,
ce.Expression, new JSDefaultValueLiteral(currentType),
TypeSystem.Boolean
);
}
else if (
TypeUtil.IsNumeric(targetType) &&
TypeUtil.IsNumeric(currentType) &&
!TypeUtil.TypesAreEqual(targetType, currentType, true)
)
{
TypeReference innerType = null;
if (innerCast != null)
{
innerType = innerCast.Expression.GetActualType(TypeSystem);
}
if (
TypeUtil.TypesAreAssignable(TypeInfo, targetType, innerType) &&
(
(TypeUtil.IsFloatingPoint(targetType) == TypeUtil.IsFloatingPoint(currentType)) &&
(TypeUtil.IsFloatingPoint(targetType) == TypeUtil.IsFloatingPoint(innerType))
) &&
(TypeUtil.IsSigned(targetType) == TypeUtil.IsSigned(innerType)) &&
(TypeUtil.SizeOfType(targetType) <= TypeUtil.SizeOfType(currentType)) &&
(TypeUtil.SizeOfType(targetType) >= TypeUtil.SizeOfType(innerType))
)
{
// HACK: Turn pointless conversions like '(int32)(int64)(1 + 2)' into '(1 + 2)'
newExpression = innerCast.Expression;
}
else if (currentType.MetadataType == MetadataType.Int64)
{
if (!EmulateInt64)
{
newExpression = ce;
}
else if (targetType.MetadataType == MetadataType.UInt64)
{
newExpression = JSInvocationExpression
.InvokeMethod(
TypeSystem.Int64,
new JSFakeMethod("ToUInt64", TypeSystem.UInt64, new TypeReference[] { }, MethodTypeFactory),
ce.Expression);
}
else
{
newExpression = JSInvocationExpression
.InvokeMethod(
TypeSystem.Int64,
new JSFakeMethod("ToNumber", targetType, new TypeReference[] { TypeSystem.Double, TypeSystem.Boolean }, MethodTypeFactory),
ce.Expression,
GetInt64ConversionArgs(targetType));
}
}
else if (currentType.MetadataType == MetadataType.UInt64)
{
if (!EmulateInt64)
{
newExpression = ce;
}
else if (targetType.MetadataType == MetadataType.Int64)
{
newExpression = JSInvocationExpression
.InvokeMethod(
TypeSystem.Int64,
new JSFakeMethod("ToInt64", TypeSystem.Int64, new TypeReference[] { }, MethodTypeFactory),
ce.Expression);
}
else
{
newExpression = JSInvocationExpression
.InvokeMethod(
TypeSystem.Int64,
new JSFakeMethod("ToNumber", targetType, new TypeReference[] { TypeSystem.Double, TypeSystem.Boolean }, MethodTypeFactory),
ce.Expression,
GetInt64ConversionArgs(targetType));
}
}
else if (targetType.MetadataType == MetadataType.Int64)
{
if (!EmulateInt64)
{
newExpression = ce;
}
else
{
newExpression = JSInvocationExpression.InvokeStatic(
new JSType(TypeSystem.Int64),
new JSFakeMethod("FromNumber", TypeSystem.Int64, new[] { currentType }, MethodTypeFactory),
new[] { ce.Expression }, true
);
}
}
else if (targetType.MetadataType == MetadataType.UInt64)
{
if (!EmulateInt64)
{
newExpression = ce;
}
else
{
newExpression = JSInvocationExpression.InvokeStatic(
new JSType(TypeSystem.UInt64),
new JSFakeMethod("FromNumber", TypeSystem.UInt64, new[] { currentType }, MethodTypeFactory),
new[] { ce.Expression }, true
);
}
}
else if (TypeUtil.IsIntegral(currentType))
{
if (!TypeUtil.IsIntegral(targetType))
{
// Integer -> float conversion
newExpression = new JSIntegerToFloatExpression(ce.Expression, targetType);
}
else if (TypeUtil.SizeOfType(currentType) < TypeUtil.SizeOfType(targetType))
{
// Widening integer -> integer conversion
newExpression = ce.Expression;
}
else
{
newExpression = null;
}
}
else if (TypeUtil.IsIntegral(targetType))
{
newExpression = new JSTruncateExpression(ce.Expression);
}
else if (TypeUtil.SizeOfType(targetType) < TypeUtil.SizeOfType(currentType))
{
// Narrowing double -> float conversion
newExpression = new JSDoubleToFloatExpression(ce.Expression);
}
else
{
// Widening float -> double conversion
newExpression = new JSFloatToDoubleExpression(ce.Expression);
}
}
else
{
// newExpression = JSIL.Cast(ce.Expression, targetType);
}
if ((newExpression != null) && (newExpression != ce))
{
ParentNode.ReplaceChild(ce, newExpression);
VisitReplacement(newExpression);
}
else
{
// Debugger.Break();
VisitChildren(ce);
}
}
public void VisitNode(JSBinaryOperatorExpression boe)
{
var leftType = boe.Left.GetActualType(TypeSystem);
var leftIsEnum = IsEnumOrNullableEnum(leftType);
var rightType = boe.Right.GetActualType(TypeSystem);
var rightIsEnum = IsEnumOrNullableEnum(rightType);
var resultType = boe.GetActualType(TypeSystem);
var resultIsEnum = IsEnumOrNullableEnum(resultType);
var eitherIsEnum = leftIsEnum || rightIsEnum;
var assignmentOperator = boe.Operator as JSAssignmentOperator;
JSBinaryOperator replacementOperator;
if (LogicalOperators.Contains(boe.Operator))
{
if (eitherIsEnum)
{
if (leftIsEnum)
{
var cast = JSInvocationExpression.InvokeMethod(
JS.valueOf(TypeSystem.Int32), boe.Left, null, true
);
boe.ReplaceChild(boe.Left, cast);
}
if (rightIsEnum)
{
var cast = JSInvocationExpression.InvokeMethod(
JS.valueOf(TypeSystem.Int32), boe.Right, null, true
);
boe.ReplaceChild(boe.Right, cast);
}
}
}
else if (BitwiseOperators.Contains(boe.Operator))
{
var parentCast = ParentNode as JSCastExpression;
if (resultIsEnum && ((parentCast == null) || (parentCast.NewType != resultType)))
{
var cast = JSCastExpression.New(
boe, resultType, TypeSystem, true
);
ParentNode.ReplaceChild(boe, cast);
VisitReplacement(cast);
}
}
else if (
(assignmentOperator != null) &&
ReverseCompoundAssignments.TryGetValue(assignmentOperator, out replacementOperator) &&
leftIsEnum
)
{
var replacement = new JSBinaryOperatorExpression(
JSOperator.Assignment, boe.Left,
JSCastExpression.New(
new JSBinaryOperatorExpression(
replacementOperator, boe.Left, boe.Right, TypeSystem.Int32
), leftType, TypeSystem, true
),
leftType
);
ParentNode.ReplaceChild(boe, replacement);
VisitReplacement(replacement);
return;
}
VisitChildren(boe);
}