protected override bool EmitInternal(BinaryExpression node, EmittingContext context, GroboIL.Label returnDefaultValueLabel, ResultType whatReturn, bool extend, out Type resultType)
{
var il = context.Il;
var left = node.Left;
var right = node.Right;
bool result = false;
Type assigneeType;
AssigneeKind assigneeKind;
bool checkNullReferences = context.Options.HasFlag(CompilerOptions.CheckNullReferences);
extend |= context.Options.HasFlag(CompilerOptions.ExtendOnAssign);
GroboIL.Label assigneeIsNullLabel = null;
bool assigneeIsNullLabelUsed = false;
switch (left.NodeType)
{
case ExpressionType.Parameter:
assigneeType = null;
assigneeKind = AssigneeKind.Parameter;
checkNullReferences = false;
break;
case ExpressionType.MemberAccess:
var memberExpression = (MemberExpression)left;
if (memberExpression.Expression == null)
{
assigneeType = null;
assigneeKind = memberExpression.Member is FieldInfo ? AssigneeKind.StaticField : AssigneeKind.StaticProperty;
checkNullReferences = false;
}
else
{
bool closureAssign = memberExpression.Expression == context.ParsedLambda.ClosureParameter || memberExpression.Expression.Type.IsStaticClosure();
checkNullReferences &= !closureAssign;
if (node.NodeType != ExpressionType.Assign && context.CanReturn)
{
result |= ExpressionEmittersCollection.Emit(memberExpression.Expression, context, returnDefaultValueLabel, ResultType.ByRefValueTypesOnly, extend, out assigneeType);
}
else
{
assigneeIsNullLabel = !closureAssign && context.CanReturn ? il.DefineLabel("assigneeIsNull") : null;
assigneeIsNullLabelUsed = ExpressionEmittersCollection.Emit(memberExpression.Expression, context, assigneeIsNullLabel, ResultType.ByRefValueTypesOnly, extend, out assigneeType);
}
assigneeKind = memberExpression.Member is FieldInfo ? AssigneeKind.InstanceField : AssigneeKind.InstanceProperty;
}
break;
case ExpressionType.Index:
var indexExpression = (IndexExpression)left;
if (indexExpression.Object == null)
{
throw new InvalidOperationException("Indexing of null object is invalid");
}
if ((indexExpression.Object.Type.IsArray && indexExpression.Object.Type.GetArrayRank() == 1) || indexExpression.Object.Type.IsList())
{
if (node.NodeType != ExpressionType.Assign && context.CanReturn)
{
result |= ArrayIndexExpressionEmitter.Emit(indexExpression.Object, indexExpression.Arguments.Single(), context, returnDefaultValueLabel, ResultType.ByRefAll, extend, out assigneeType);
checkNullReferences = false;
}
else
{
assigneeIsNullLabel = context.CanReturn ? il.DefineLabel("assigneeIsNull") : null;
assigneeIsNullLabelUsed = ArrayIndexExpressionEmitter.Emit(indexExpression.Object, indexExpression.Arguments.Single(), context, assigneeIsNullLabel, ResultType.ByRefAll, extend, out assigneeType);
}
assigneeKind = AssigneeKind.SimpleArray;
}
else
{
if (node.NodeType != ExpressionType.Assign && context.CanReturn)
{
result |= ExpressionEmittersCollection.Emit(indexExpression.Object, context, returnDefaultValueLabel, ResultType.ByRefValueTypesOnly, extend, out assigneeType);
}
else
{
assigneeIsNullLabel = context.CanReturn ? il.DefineLabel("assigneeIsNull") : null;
assigneeIsNullLabelUsed = ExpressionEmittersCollection.Emit(indexExpression.Object, context, assigneeIsNullLabel, ResultType.ByRefValueTypesOnly, extend, out assigneeType);
}
assigneeKind = indexExpression.Indexer != null ? AssigneeKind.IndexedProperty : AssigneeKind.MultiDimensionalArray;
}
break;
default:
throw new InvalidOperationException("Unable to assign to an expression of type '" + left.NodeType + "'");
}
if (assigneeType != null && assigneeType.IsValueType)
{
using (var temp = context.DeclareLocal(assigneeType))
{
il.Stloc(temp);
il.Ldloca(temp);
}
assigneeType = assigneeType.MakeByRefType();
}
if (node.NodeType == ExpressionType.Assign)
{
if (!checkNullReferences)
{
if (whatReturn == ResultType.Void)
{
EmitAssign(assigneeKind, left, context, null, right);
}
else
{
if (assigneeKind == AssigneeKind.Parameter)
{
EmitAssign(assigneeKind, left, context, null, right);
EmitAccess(assigneeKind, left, context);
}
else
{
context.EmitLoadArguments(right);
using (var value = context.DeclareLocal(right.Type))
{
il.Stloc(value);
EmitAssign(assigneeKind, left, context, null, value);
il.Ldloc(value);
}
}
}
}
else
{
if (whatReturn == ResultType.Void)
{
il.Dup();
var skipAssigneeLabel = il.DefineLabel("skipAssignee");
il.Brfalse(skipAssigneeLabel);
EmitAssign(assigneeKind, left, context, null, right);
var returnLabel = il.DefineLabel("return");
il.Br(returnLabel);
context.MarkLabelAndSurroundWithSP(skipAssigneeLabel);
il.Pop();
context.MarkLabelAndSurroundWithSP(returnLabel);
}
else
{
// load value
var rightIsNullLabel = context.CanReturn ? il.DefineLabel("rightIsNull") : null;
Type valueType;
bool labelUsed = ExpressionEmittersCollection.Emit(right, context, rightIsNullLabel, out valueType); // stack: [address, value]
if (right.Type == typeof(bool) && valueType == typeof(bool?))
{
context.ConvertFromNullableBoolToBool();
}
if (labelUsed && context.CanReturn)
{
context.EmitReturnDefaultValue(right.Type, rightIsNullLabel, il.DefineLabel("rightIsNotNull"));
}
using (var value = context.DeclareLocal(right.Type))
{
il.Stloc(value);
il.Dup();
var skipAssigneeLabel = il.DefineLabel("skipAssignee");
il.Brfalse(skipAssigneeLabel);
EmitAssign(assigneeKind, left, context, null, value);
var returnValueLabel = il.DefineLabel("returnValue");
il.Br(returnValueLabel);
context.MarkLabelAndSurroundWithSP(skipAssigneeLabel);
il.Pop();
context.MarkLabelAndSurroundWithSP(returnValueLabel);
il.Ldloc(value);
}
}
}
}
else
{
if (checkNullReferences)
{
il.Dup();
il.Brfalse(returnDefaultValueLabel);
result = true;
}
if (assigneeType != null)
{
il.Dup();
}
object[] arguments = EmitAccess(assigneeKind, left, context);
context.EmitLoadArguments(right);
context.EmitArithmeticOperation(GetOp(node.NodeType), left.Type, left.Type, right.Type, node.Method);
if (whatReturn == ResultType.Void)
{
EmitAssign(assigneeKind, left, context, arguments);
}
else
{
if (assigneeKind == AssigneeKind.Parameter)
{
EmitAssign(assigneeKind, left, context, arguments);
EmitAccess(assigneeKind, left, context);
}
else
{
using (var temp = context.DeclareLocal(left.Type))
{
il.Stloc(temp);
EmitAssign(assigneeKind, left, context, arguments, temp);
il.Ldloc(temp);
}
}
}
}
resultType = whatReturn == ResultType.Void ? typeof(void) : left.Type;
if (assigneeIsNullLabelUsed)
{
context.EmitReturnDefaultValue(resultType, assigneeIsNullLabel, il.DefineLabel("assigneeIsNotNull"));
}
return(result);
}
protected override bool EmitInternal(IndexExpression node, EmittingContext context, GroboIL.Label returnDefaultValueLabel, ResultType whatReturn, bool extend, out Type resultType)
{
if (node.Object == null)
{
throw new InvalidOperationException("Indexing of null object is invalid");
}
if (node.Object.Type.IsArray && node.Object.Type.GetArrayRank() == 1)
{
return(ExpressionEmittersCollection.Emit(Expression.ArrayIndex(node.Object, node.Arguments.Single()), context, returnDefaultValueLabel, whatReturn, extend, out resultType));
}
if (node.Object.Type.IsList())
{
return(ArrayIndexExpressionEmitter.Emit(node.Object, node.Arguments.Single(), context, returnDefaultValueLabel, whatReturn, extend, out resultType));
}
Type objectType;
bool result = ExpressionEmittersCollection.Emit(node.Object, context, returnDefaultValueLabel, ResultType.ByRefValueTypesOnly, extend, out objectType);
if (objectType.IsValueType)
{
using (var temp = context.DeclareLocal(objectType))
{
context.Il.Stloc(temp);
context.Il.Ldloca(temp);
}
}
if (context.Options.HasFlag(CompilerOptions.CheckNullReferences))
{
result |= context.EmitNullChecking(objectType, returnDefaultValueLabel);
}
if (node.Indexer != null)
{
context.EmitLoadArguments(node.Arguments.ToArray());
MethodInfo getter = node.Indexer.GetGetMethod(context.SkipVisibility);
if (getter == null)
{
throw new MissingMethodException(node.Indexer.ReflectedType.ToString(), "get_" + node.Indexer.Name);
}
GroboIL.Label doneLabel = null;
if (node.Object.Type.IsDictionary())
{
var valueType = node.Object.Type.GetGenericArguments()[1];
var constructor = valueType.GetConstructor(Type.EmptyTypes);
extend &= (valueType.IsClass && constructor != null) || valueType.IsArray || valueType.IsValueType || valueType == typeof(string);
doneLabel = context.Il.DefineLabel("done");
using (var dict = context.DeclareLocal(node.Object.Type))
using (var key = context.DeclareLocal(node.Arguments.Single().Type))
using (var value = context.DeclareLocal(valueType))
{
context.Il.Stloc(key); // key = arg0; stack: [dict]
context.Il.Dup(); // stack: [dict, dict]
context.Il.Stloc(dict); // stack: [dict]
context.Il.Ldloc(key); // stack: [dict, key]
context.Il.Ldloca(value); // stack: [dict, key, ref value]
var tryGetValueMethod = node.Object.Type.GetMethod("TryGetValue", BindingFlags.Public | BindingFlags.Instance);
if (tryGetValueMethod == null)
{
throw new MissingMethodException(node.Object.Type.Name, "TryGetValue");
}
context.Il.Call(tryGetValueMethod, node.Object.Type); // stack: [dict.TryGetValue(key, out value)]
var loadResultLabel = context.Il.DefineLabel("loadResult");
context.Il.Brtrue(loadResultLabel); // if(dict.TryGetValue(key, out result)) goto loadResult; stack: []
if (valueType.IsValueType)
{
context.Il.Ldloca(value);
context.Il.Initobj(valueType); // value = default(valueType)
context.Il.Ldloc(value); // stack: [default(valueType)]
}
else if (valueType == typeof(string))
{
context.Il.Ldstr("");
}
else
{
context.Create(valueType);
}
context.Il.Stloc(value);
if (extend)
{
context.Il.Ldloc(dict); // stack: [dict]
context.Il.Ldloc(key); // stack: [dict, key]
context.Il.Ldloc(value); // stack: [dict, key, value]
var setter = node.Indexer.GetSetMethod(context.SkipVisibility);
if (setter == null)
{
throw new MissingMethodException(node.Indexer.ReflectedType.ToString(), "set_" + node.Indexer.Name);
}
context.Il.Call(setter, node.Object.Type); // dict.set_Item(key, default(valueType)); stack: []
}
context.MarkLabelAndSurroundWithSP(loadResultLabel);
context.Il.Ldloc(value);
}
}
if (doneLabel != null)
{
context.MarkLabelAndSurroundWithSP(doneLabel);
}
else
{
context.Il.Call(getter, node.Object.Type);
}
}
else
{
Type arrayType = node.Object.Type;
if (!arrayType.IsArray)
{
throw new InvalidOperationException("An array expected");
}
int rank = arrayType.GetArrayRank();
if (rank != node.Arguments.Count)
{
throw new InvalidOperationException("Incorrect number of indeces '" + node.Arguments.Count + "' provided to access an array with rank '" + rank + "'");
}
Type indexType = node.Arguments.First().Type;
if (indexType != typeof(int))
{
throw new InvalidOperationException("Indexing array with an index of type '" + indexType + "' is not allowed");
}
context.EmitLoadArguments(node.Arguments.ToArray());
MethodInfo getMethod = arrayType.GetMethod("Get");
if (getMethod == null)
{
throw new MissingMethodException(arrayType.ToString(), "Get");
}
context.Il.Call(getMethod, arrayType);
}
resultType = node.Type;
return(result);
}