protected override bool EmitInternal(ConditionalExpression node, EmittingContext context, GroboIL.Label returnDefaultValueLabel, ResultType whatReturn, bool extend, out Type resultType)
{
var test = node.Test;
var ifTrue = node.IfTrue;
var ifFalse = node.IfFalse;
var ifTrueBranchIsEmpty = ifTrue.NodeType == ExpressionType.Default && ifTrue.Type == typeof(void);
if (ifTrueBranchIsEmpty)
{
test = Expression.Not(test);
var temp = ifTrue;
ifTrue = ifFalse;
ifFalse = temp;
}
var result = false;
var il = context.Il;
var testIsNullLabel = il.DefineLabel("testIsNull");
Type testType;
var testIsNullLabelUsed = ExpressionEmittersCollection.Emit(test, context, testIsNullLabel, out testType);
if (testType == typeof(bool?))
{
context.ConvertFromNullableBoolToBool();
}
var ifFalseLabel = il.DefineLabel("ifFalse");
il.Brfalse(ifFalseLabel);
Type ifTrueType;
result |= ExpressionEmittersCollection.Emit(ifTrue, context, returnDefaultValueLabel, whatReturn, extend, out ifTrueType);
if (node.Type == typeof(void) && ifTrueType != typeof(void))
{
using (var temp = context.DeclareLocal(ifTrueType))
il.Stloc(temp);
}
var doneLabel = il.DefineLabel("done");
il.Br(doneLabel);
if (testIsNullLabelUsed)
{
context.MarkLabelAndSurroundWithSP(testIsNullLabel);
il.Pop();
}
context.MarkLabelAndSurroundWithSP(ifFalseLabel);
Type ifFalseType;
result |= ExpressionEmittersCollection.Emit(ifFalse, context, returnDefaultValueLabel, whatReturn, extend, out ifFalseType);
if (node.Type == typeof(void) && ifFalseType != typeof(void))
{
using (var temp = context.DeclareLocal(ifFalseType))
il.Stloc(temp);
}
context.MarkLabelAndSurroundWithSP(doneLabel);
if (ifTrueType != typeof(void) && ifFalseType != typeof(void) && ifTrueType != ifFalseType)
{
throw new InvalidOperationException(string.Format("ifTrue type '{0}' is not equal to ifFalse type '{1}'", ifTrueType, ifFalseType));
}
resultType = node.Type == typeof(void) ? typeof(void) : ifTrueType;
return(result);
}
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(BlockExpression node, EmittingContext context, GroboIL.Label returnDefaultValueLabel, ResultType whatReturn, bool extend, out Type resultType)
{
var variables = node.Variables.Where(variable => !context.VariablesToLocals.ContainsKey(variable)).ToArray();
foreach (var variable in variables)
{
var local = string.IsNullOrEmpty(variable.Name)
? context.Il.DeclareLocal(variable.Type)
: context.Il.DeclareLocal(variable.Type, variable.Name, appendUniquePrefix: false);
if (context.DebugInfoGenerator != null)
{
local.SetLocalSymInfo(local.Name);
}
context.VariablesToLocals.Add(variable, local);
context.Variables.Push(variable);
}
resultType = typeof(void);
for (var index = 0; index < node.Expressions.Count; index++)
{
var expression = node.Expressions[index];
var il = context.Il;
var valueIsNullLabel = il.DefineLabel("valueIsNull");
var labelUsed = ExpressionEmittersCollection.Emit(expression, context, valueIsNullLabel, index < node.Expressions.Count - 1 ? ResultType.Void : whatReturn, extend, out resultType);
if (resultType != typeof(void) && index < node.Expressions.Count - 1)
{
// eat results of all expressions except the last one
if (resultType.IsStruct())
{
using (var temp = context.DeclareLocal(resultType))
context.Il.Stloc(temp);
}
else
{
context.Il.Pop();
}
}
if (labelUsed)
{
var doneLabel = il.DefineLabel("done");
il.Br(doneLabel);
context.MarkLabelAndSurroundWithSP(valueIsNullLabel);
il.Pop();
if (resultType != typeof(void) && index == node.Expressions.Count - 1)
{
// return default value for the last expression in the block
context.EmitLoadDefaultValue(resultType);
}
context.MarkLabelAndSurroundWithSP(doneLabel);
}
}
if (node.Type == typeof(bool) && resultType == typeof(bool?))
{
resultType = typeof(bool);
context.ConvertFromNullableBoolToBool();
}
else if (node.Type == typeof(void) && resultType != typeof(void))
{
// eat result of the last expression if the result of block is void
if (resultType.IsStruct())
{
using (var temp = context.DeclareLocal(resultType))
context.Il.Stloc(temp);
}
else
{
context.Il.Pop();
}
resultType = typeof(void);
}
foreach (var variable in variables)
{
context.VariablesToLocals.Remove(variable);
context.Variables.Pop();
}
return(false);
}