public override BoundNode VisitArgListOperator(BoundArgListOperator node)
{
BoundSpillSequence2 ss = null;
var newArgs = VisitExpressionList(ref ss, node.Arguments);
return(UpdateExpression(ss, node.Update(newArgs, node.ArgumentRefKindsOpt, node.Type)));
}
public override BoundNode VisitThrowStatement(BoundThrowStatement node)
{
BoundSpillSequence2 ss = null;
BoundExpression expression = VisitExpression(ref ss, node.ExpressionOpt);
return(UpdateStatement(ss, node.Update(expression)));
}
public override BoundNode VisitAddressOfOperator(BoundAddressOfOperator node)
{
BoundSpillSequence2 ss = null;
var expr = VisitExpression(ref ss, node.Operand);
return(UpdateExpression(ss, node.Update(expr, node.IsFixedStatementAddressOf, node.Type)));
}
public override BoundNode VisitAwaitExpression(BoundAwaitExpression node)
{
var ss = new BoundSpillSequence2();
var replacement = VisitExpression(ref ss, node);
return(ss.Update(replacement));
}
public override BoundNode VisitUnaryOperator(BoundUnaryOperator node)
{
BoundSpillSequence2 ss = null;
BoundExpression operand = VisitExpression(ref ss, node.Operand);
return(UpdateExpression(ss, node.Update(node.OperatorKind, operand, node.ConstantValueOpt, node.MethodOpt, node.ResultKind, node.Type)));
}
internal BoundSpillSequence2 Update(BoundExpression value)
{
var result = new BoundSpillSequence2(value);
result.locals = this.locals;
result.statements = this.statements;
return result;
}
public override BoundNode VisitArrayAccess(BoundArrayAccess node)
{
BoundSpillSequence2 ssArray = null;
var expression = VisitExpression(ref ssArray, node.Expression);
BoundSpillSequence2 ssIndices = null;
var indices = this.VisitExpressionList(ref ssIndices, node.Indices);
if (ssIndices != null)
{
// spill the array if there were await expressions in the indices
if (ssArray == null)
{
ssArray = new BoundSpillSequence2();
}
expression = Spill(ssArray, expression);
}
if (ssArray != null)
{
ssArray.IncludeSequence(ssIndices);
ssIndices = ssArray;
ssArray = null;
}
return(UpdateExpression(ssIndices, node.Update(expression, indices, node.Type)));
}
public override BoundNode VisitArrayInitialization(BoundArrayInitialization node)
{
BoundSpillSequence2 ss = null;
var initializers = this.VisitExpressionList(ref ss, node.Initializers);
return(UpdateExpression(ss, node.Update(initializers)));
}
public override BoundNode VisitIsOperator(BoundIsOperator node)
{
BoundSpillSequence2 ss = null;
var operand = VisitExpression(ref ss, node.Operand);
return(UpdateExpression(ss, node.Update(operand, node.TargetType, node.Conversion, node.Type)));
}
public override BoundNode VisitConversion(BoundConversion node)
{
BoundSpillSequence2 ss = null;
var operand = VisitExpression(ref ss, node.Operand);
return(UpdateExpression(ss, node.Update(operand, node.ConversionKind, node.SymbolOpt, node.Checked, node.ExplicitCastInCode, node.IsExtensionMethod, node.IsArrayIndex, node.ConstantValueOpt, node.ResultKind, node.Type)));
}
public override BoundNode VisitDelegateCreationExpression(BoundDelegateCreationExpression node)
{
BoundSpillSequence2 ss = null;
var argument = VisitExpression(ref ss, node.Argument);
return(UpdateExpression(ss, node.Update(argument, node.MethodOpt, node.IsExtensionMethod, node.Type)));
}
public override BoundNode VisitFieldAccess(BoundFieldAccess node)
{
BoundSpillSequence2 ss = null;
var receiver = VisitExpression(ref ss, node.ReceiverOpt);
return(UpdateExpression(ss, node.Update(receiver, node.FieldSymbol, node.ConstantValueOpt, node.ResultKind, node.Type)));
}
public override BoundNode VisitPointerIndirectionOperator(BoundPointerIndirectionOperator node)
{
BoundSpillSequence2 ss = null;
var operand = VisitExpression(ref ss, node.Operand);
return(UpdateExpression(ss, node.Update(operand, node.Type)));
}
public override BoundNode VisitConditionalGoto(BoundConditionalGoto node)
{
BoundSpillSequence2 ss = null;
var condition = VisitExpression(ref ss, node.Condition);
return(UpdateStatement(ss, node.Update(condition, node.JumpIfTrue, node.Label)));
}
public override BoundNode VisitBinaryOperator(BoundBinaryOperator node)
{
BoundSpillSequence2 ss = null;
var right = VisitExpression(ref ss, node.Right);
BoundExpression left;
if (ss == null)
{
left = VisitExpression(ref ss, node.Left);
}
else
{
var ssLeft = new BoundSpillSequence2();
left = VisitExpression(ref ssLeft, node.Left);
left = Spill(ssLeft, left);
if (node.OperatorKind == BinaryOperatorKind.LogicalBoolOr || node.OperatorKind == BinaryOperatorKind.LogicalBoolAnd)
{
ssLeft.Add(F.If(
node.OperatorKind == BinaryOperatorKind.LogicalBoolAnd ? left : F.Not(left),
UpdateStatement(ss, F.Assignment(left, right))
));
return(UpdateExpression(ssLeft, left));
}
else
{
// if the right-hand-side has await, spill the left
ssLeft.IncludeSequence(ss);
ss = ssLeft;
}
}
return(UpdateExpression(ss, node.Update(node.OperatorKind, left, right, node.ConstantValue, node.MethodOpt, node.ResultKind, node.Type)));
}
public override BoundNode VisitAssignmentOperator(BoundAssignmentOperator node)
{
BoundSpillSequence2 ss = null;
var right = VisitExpression(ref ss, node.Right);
BoundExpression left;
if (ss == null || node.Left.Kind == BoundKind.Local)
{
left = VisitExpression(ref ss, node.Left);
}
else
{
// if the right-hand-side has await, spill the left
var ss2 = new BoundSpillSequence2();
left = VisitExpression(ref ss2, node.Left);
if (left.Kind != BoundKind.Local)
{
left = Spill(ss2, left, RefKind.Ref);
}
ss2.IncludeSequence(ss);
ss = ss2;
}
return(UpdateExpression(ss, node.Update(left, right, node.RefKind, node.Type)));
}
public override BoundNode VisitArrayLength(BoundArrayLength node)
{
BoundSpillSequence2 ss = null;
var expression = VisitExpression(ref ss, node.Expression);
return(UpdateExpression(ss, node.Update(expression, node.Type)));
}
public override BoundNode VisitNullCoalescingOperator(BoundNullCoalescingOperator node)
{
BoundSpillSequence2 ss = null;
var right = VisitExpression(ref ss, node.RightOperand);
BoundExpression left;
if (ss == null)
{
left = VisitExpression(ref ss, node.LeftOperand);
}
else
{
var ssLeft = new BoundSpillSequence2();
left = VisitExpression(ref ssLeft, node.LeftOperand);
left = Spill(ssLeft, left);
ssLeft.Add(F.If(
F.ObjectEqual(left, F.Null(left.Type)),
UpdateStatement(ss, F.Assignment(left, right))
));
return(UpdateExpression(ssLeft, left));
}
return(UpdateExpression(ss, node.Update(left, right, node.LeftConversion, node.Type)));
}
internal BoundSpillSequence2 Update(BoundExpression value)
{
var result = new BoundSpillSequence2(value);
result.locals = this.locals;
result.statements = this.statements;
return(result);
}
public override BoundNode VisitObjectCreationExpression(BoundObjectCreationExpression node)
{
Debug.Assert(node.InitializerExpressionOpt == null);
BoundSpillSequence2 ss = null;
var arguments = this.VisitExpressionList(ref ss, node.Arguments, node.ArgumentRefKindsOpt);
return(UpdateExpression(ss, node.Update(node.Constructor, arguments, node.ArgumentNamesOpt, node.ArgumentRefKindsOpt, node.Expanded, node.ArgsToParamsOpt, node.ConstantValueOpt, node.InitializerExpressionOpt, node.Type)));
}
public override BoundNode VisitSwitchStatement(BoundSwitchStatement node)
{
BoundSpillSequence2 ss = null;
BoundExpression boundExpression = VisitExpression(ref ss, node.BoundExpression);
ImmutableArray <BoundSwitchSection> switchSections = (ImmutableArray <BoundSwitchSection>) this.VisitList(node.SwitchSections);
return(UpdateStatement(ss, node.Update(node.OuterLocals, boundExpression, node.ConstantTargetOpt, node.InnerLocals, switchSections, node.BreakLabel, node.StringEquality)));
}
internal void IncludeSequence(BoundSpillSequence2 ss)
{
if (ss != null)
{
AddRange(ss.Locals);
AddRange(ss.Statements);
ss.Free();
}
}
internal void IncludeSequence(BoundSpillSequence2 ss)
{
if (ss != null)
{
AddRange(ss.Locals);
AddRange(ss.Statements);
ss.Free();
}
}
private ImmutableArray <BoundExpression> VisitExpressionList(
ref BoundSpillSequence2 spill,
ImmutableArray <BoundExpression> args,
ImmutableArray <RefKind> refKinds = default(ImmutableArray <RefKind>),
bool forceSpill = false,
bool sideEffectsOnly = false)
{
var newList = VisitList(args);
int lastSpill;
if (forceSpill)
{
lastSpill = args.Length - 1;
}
else
{
lastSpill = -1;
for (int i = 0; i < newList.Length; i++)
{
if (newList[i].Kind == SpillSequence2)
{
lastSpill = i;
}
}
}
if (lastSpill == -1)
{
return(newList);
}
if (spill == null)
{
spill = new BoundSpillSequence2();
}
var builder = ArrayBuilder <BoundExpression> .GetInstance();
for (int i = 0; i <= lastSpill; i++)
{
var replacement = Spill(spill, newList[i], (!refKinds.IsDefaultOrEmpty && refKinds.Length > i && refKinds[i] != RefKind.None) ? RefKind.Ref : RefKind.None, sideEffectsOnly);
Debug.Assert(sideEffectsOnly || replacement != null);
if (!sideEffectsOnly)
{
builder.Add(replacement);
}
}
for (int i = lastSpill + 1; i < newList.Length; i++)
{
builder.Add(newList[i]);
}
return(builder.ToImmutableAndFree());
}
private static BoundExpression UpdateExpression(BoundSpillSequence2 ss, BoundExpression expression)
{
if (ss == null)
{
return(expression);
}
Debug.Assert(ss.Value == null);
if (ss.Locals.Length == 0 && ss.Statements.Length == 0)
{
ss.Free();
return(expression);
}
return(ss.Update(expression));
}
private BoundStatement UpdateStatement(BoundSpillSequence2 ss, BoundStatement stmt)
{
if (ss == null)
{
Debug.Assert(stmt != null);
return(stmt);
}
Debug.Assert(ss.Value == null);
if (stmt != null)
{
ss.Add(stmt);
}
var result = F.Block(ss.Locals, ss.Statements);
ss.Free();
return(result);
}
private BoundExpression VisitExpression(ref BoundSpillSequence2 ss, BoundExpression expression)
{
// wrap the node in a spill sequence to mark the fact that it must be moved up the tree.
// The caller will handle this node type if the result is discarded.
if (expression != null && expression.Kind == BoundKind.AwaitExpression)
{
// we force the await expression to be assigned to a temp variable
var awaitExpression = (BoundAwaitExpression)expression;
awaitExpression = awaitExpression.Update(
VisitExpression(ref ss, awaitExpression.Expression), awaitExpression.GetAwaiter, awaitExpression.IsCompleted, awaitExpression.GetResult, awaitExpression.Type);
BoundAssignmentOperator assignToTemp;
var replacement = F.StoreToTemp(awaitExpression, out assignToTemp, kind: SynthesizedLocalKind.AwaitSpilledTemp);
if (ss == null)
{
ss = new BoundSpillSequence2();
}
ss.Add(replacement.LocalSymbol);
writeOnceTemps.Add(replacement.LocalSymbol);
F.Syntax = awaitExpression.Syntax;
ss.Add(F.ExpressionStatement(assignToTemp));
return(replacement);
}
var e = VisitExpression(expression);
if (e == null || e.Kind != SpillSequence2)
{
return(e);
}
var newss = (BoundSpillSequence2)e;
if (ss == null)
{
ss = newss.Update(null);
}
else
{
ss.IncludeSequence(newss);
}
return(newss.Value);
}
public override BoundNode VisitArrayCreation(BoundArrayCreation node)
{
BoundSpillSequence2 ss = null;
var init = (BoundArrayInitialization)VisitExpression(ref ss, node.InitializerOpt);
ImmutableArray <BoundExpression> bounds;
if (ss == null)
{
bounds = VisitExpressionList(ref ss, node.Bounds);
}
else
{
// spill bounds expressions if initializers contain await
var ss2 = new BoundSpillSequence2();
bounds = VisitExpressionList(ref ss2, node.Bounds, forceSpill: true);
ss2.IncludeSequence(ss);
ss = ss2;
}
return(UpdateExpression(ss, node.Update(bounds, init, node.Type)));
}
public override BoundNode VisitSequence(BoundSequence node)
{
BoundSpillSequence2 ss2 = null;
var value = VisitExpression(ref ss2, node.Value);
BoundSpillSequence2 ss1 = null;
var sideEffects = VisitExpressionList(ref ss1, node.SideEffects, forceSpill: ss2 != null, sideEffectsOnly: true);
if (ss1 == null && ss2 == null)
{
return(node.Update(node.Locals, sideEffects, value, node.Type));
}
if (ss1 == null)
{
ss1 = new BoundSpillSequence2(); // possible if sideEffects is empty
}
ss1.AddRange(sideEffects, MakeExpressionStatement);
ss1.AddRange(node.Locals);
ss1.IncludeSequence(ss2);
return(ss1.Update(value));
}
public override BoundNode VisitCall(BoundCall node)
{
BoundSpillSequence2 ss = null;
var arguments = this.VisitExpressionList(ref ss, node.Arguments, node.ArgumentRefKindsOpt);
BoundExpression receiver = null;
if (ss == null)
{
receiver = VisitExpression(ref ss, node.ReceiverOpt);
}
else if (!node.Method.IsStatic)
{
// spill the receiver if there were await expressions in the arguments
var ss2 = new BoundSpillSequence2();
receiver = Spill(ss2, VisitExpression(ref ss2, node.ReceiverOpt), refKind: node.ReceiverOpt.Type.IsReferenceType ? RefKind.None : RefKind.Ref);
ss2.IncludeSequence(ss);
ss = ss2;
}
return(UpdateExpression(ss, node.Update(receiver, node.Method, arguments)));
}
public override BoundNode VisitPointerElementAccess(BoundPointerElementAccess node)
{
BoundSpillSequence2 ss = null;
var index = VisitExpression(ref ss, node.Index);
BoundExpression expression;
if (ss == null)
{
expression = VisitExpression(ref ss, node.Expression);
}
else
{
// if the right-hand-side has await, spill the left
var ss2 = new BoundSpillSequence2();
expression = VisitExpression(ref ss2, node.Expression);
expression = Spill(ss2, expression);
ss2.IncludeSequence(ss);
ss = ss2;
}
return(UpdateExpression(ss, node.Update(expression, index, node.Checked, node.Type)));
}
public override BoundNode VisitConditionalOperator(BoundConditionalOperator node)
{
BoundSpillSequence2 ss1 = null;
var condition = VisitExpression(ref ss1, node.Condition);
BoundSpillSequence2 ss2 = null;
var consequence = VisitExpression(ref ss2, node.Consequence);
BoundSpillSequence2 ss3 = null;
var alternative = VisitExpression(ref ss3, node.Alternative);
if (ss2 == null && ss3 == null)
{
return(UpdateExpression(ss1, node.Update(condition, consequence, alternative, node.ConstantValueOpt, node.Type)));
}
var tmp = F.SynthesizedLocal(node.Type);
if (ss1 == null)
{
ss1 = new BoundSpillSequence2();
}
if (ss2 == null)
{
ss2 = new BoundSpillSequence2();
}
if (ss3 == null)
{
ss3 = new BoundSpillSequence2();
}
ss1.Add(tmp);
ss1.Add(
F.If(condition,
UpdateStatement(ss2, F.Assignment(F.Local(tmp), consequence)),
UpdateStatement(ss3, F.Assignment(F.Local(tmp), alternative))));
return(ss1.Update(F.Local(tmp)));
}
public override BoundNode VisitSequence(BoundSequence node)
{
BoundSpillSequence2 ss2 = null;
var value = VisitExpression(ref ss2, node.Value);
BoundSpillSequence2 ss1 = null;
var sideEffects = VisitExpressionList(ref ss1, node.SideEffects, forceSpill: ss2 != null, sideEffectsOnly: true);
if (ss1 == null && ss2 == null)
{
return node.Update(node.Locals, sideEffects, value, node.Type);
}
if (ss1 == null) ss1 = new BoundSpillSequence2(); // possible if sideEffects is empty
ss1.AddRange(sideEffects, MakeExpressionStatement);
ss1.AddRange(node.Locals);
ss1.IncludeSequence(ss2);
return ss1.Update(value);
}
private BoundExpression Spill(
BoundSpillSequence2 spill,
BoundExpression e,
RefKind refKind = RefKind.None,
bool sideEffectsOnly = false)
{
Debug.Assert(spill != null);
while (true)
{
switch (e.Kind)
{
case BoundKind.ArrayInitialization:
{
Debug.Assert(refKind == RefKind.None);
Debug.Assert(!sideEffectsOnly);
var ai = (BoundArrayInitialization)e;
var newInitializers = VisitExpressionList(ref spill, ai.Initializers, forceSpill: true);
return ai.Update(newInitializers);
}
case BoundKind.ArgListOperator:
{
Debug.Assert(refKind == RefKind.None);
Debug.Assert(!sideEffectsOnly);
var al = (BoundArgListOperator)e;
var newArgs = VisitExpressionList(ref spill, al.Arguments, al.ArgumentRefKindsOpt, forceSpill: true);
return al.Update(newArgs, al.ArgumentRefKindsOpt, al.Type);
}
case SpillSequence2:
{
var ss = (BoundSpillSequence2)e;
spill.IncludeSequence(ss);
e = ss.Value;
continue;
}
case BoundKind.Sequence:
{
var ss = (BoundSequence)e;
spill.AddRange(ss.Locals);
spill.AddRange(ss.SideEffects, MakeExpressionStatement);
e = ss.Value;
continue;
}
case BoundKind.ThisReference:
case BoundKind.BaseReference:
{
if (refKind != RefKind.None || e.Type.IsReferenceType) return e;
goto default;
}
case BoundKind.Parameter:
{
if (refKind != RefKind.None) return e;
goto default;
}
case BoundKind.Local:
{
var local = (BoundLocal)e;
if (writeOnceTemps.Contains(local.LocalSymbol) || refKind != RefKind.None) return local;
goto default;
}
case BoundKind.FieldAccess:
{
var field = (BoundFieldAccess)e;
if (field.FieldSymbol.IsReadOnly)
{
if (field.FieldSymbol.IsStatic) return field;
if (field.FieldSymbol.ContainingType.IsValueType) goto default;
// save the receiver; can get the field later.
var receiver = Spill(spill, field.ReceiverOpt, (refKind != RefKind.None && field.FieldSymbol.Type.IsReferenceType) ? refKind : RefKind.None, sideEffectsOnly);
return field.Update(receiver, field.FieldSymbol, field.ConstantValueOpt, field.ResultKind, field.Type);
}
goto default;
}
case BoundKind.Literal:
case BoundKind.TypeExpression:
return e;
default:
{
if (e.Type.SpecialType == SpecialType.System_Void || sideEffectsOnly)
{
spill.Add(F.ExpressionStatement(e));
return null;
}
else
{
BoundAssignmentOperator assignToTemp;
var replacement = F.StoreToTemp(e, out assignToTemp, refKind: refKind, kind: SynthesizedLocalKind.AwaitSpilledTemp);
spill.Add(replacement.LocalSymbol);
writeOnceTemps.Add(replacement.LocalSymbol);
spill.Add(F.ExpressionStatement(assignToTemp));
return replacement;
}
}
}
}
}
private BoundExpression VisitExpression(ref BoundSpillSequence2 ss, BoundExpression expression)
{
// wrap the node in a spill sequence to mark the fact that it must be moved up the tree.
// The caller will handle this node type if the result is discarded.
if (expression != null && expression.Kind == BoundKind.AwaitExpression)
{
// we force the await expression to be assigned to a temp variable
var awaitExpression = (BoundAwaitExpression)expression;
awaitExpression = awaitExpression.Update(
VisitExpression(ref ss, awaitExpression.Expression), awaitExpression.GetAwaiter, awaitExpression.IsCompleted, awaitExpression.GetResult, awaitExpression.Type);
BoundAssignmentOperator assignToTemp;
var replacement = F.StoreToTemp(awaitExpression, out assignToTemp, kind: SynthesizedLocalKind.AwaitSpilledTemp);
if (ss == null) ss = new BoundSpillSequence2();
ss.Add(replacement.LocalSymbol);
writeOnceTemps.Add(replacement.LocalSymbol);
F.Syntax = awaitExpression.Syntax;
ss.Add(F.ExpressionStatement(assignToTemp));
return replacement;
}
var e = VisitExpression(expression);
if (e == null || e.Kind != SpillSequence2)
{
return e;
}
var newss = (BoundSpillSequence2)e;
if (ss == null)
{
ss = newss.Update(null);
}
else
{
ss.IncludeSequence(newss);
}
return newss.Value;
}
public override BoundNode VisitPointerElementAccess(BoundPointerElementAccess node)
{
BoundSpillSequence2 ss = null;
var index = VisitExpression(ref ss, node.Index);
BoundExpression expression;
if (ss == null)
{
expression = VisitExpression(ref ss, node.Expression);
}
else
{
// if the right-hand-side has await, spill the left
var ss2 = new BoundSpillSequence2();
expression = VisitExpression(ref ss2, node.Expression);
expression = Spill(ss2, expression);
ss2.IncludeSequence(ss);
ss = ss2;
}
return UpdateExpression(ss, node.Update(expression, index, node.Checked, node.Type));
}
public override BoundNode VisitConditionalOperator(BoundConditionalOperator node)
{
BoundSpillSequence2 ss1 = null;
var condition = VisitExpression(ref ss1, node.Condition);
BoundSpillSequence2 ss2 = null;
var consequence = VisitExpression(ref ss2, node.Consequence);
BoundSpillSequence2 ss3 = null;
var alternative = VisitExpression(ref ss3, node.Alternative);
if (ss2 == null && ss3 == null)
{
return UpdateExpression(ss1, node.Update(condition, consequence, alternative, node.ConstantValueOpt, node.Type));
}
var tmp = F.SynthesizedLocal(node.Type);
if (ss1 == null) ss1 = new BoundSpillSequence2();
if (ss2 == null) ss2 = new BoundSpillSequence2();
if (ss3 == null) ss3 = new BoundSpillSequence2();
ss1.Add(tmp);
ss1.Add(
F.If(condition,
UpdateStatement(ss2, F.Assignment(F.Local(tmp), consequence)),
UpdateStatement(ss3, F.Assignment(F.Local(tmp), alternative))));
return ss1.Update(F.Local(tmp));
}
public override BoundNode VisitNullCoalescingOperator(BoundNullCoalescingOperator node)
{
BoundSpillSequence2 ss = null;
var right = VisitExpression(ref ss, node.RightOperand);
BoundExpression left;
if (ss == null)
{
left = VisitExpression(ref ss, node.LeftOperand);
}
else
{
var ssLeft = new BoundSpillSequence2();
left = VisitExpression(ref ssLeft, node.LeftOperand);
left = Spill(ssLeft, left);
ssLeft.Add(F.If(
F.ObjectEqual(left, F.Null(left.Type)),
UpdateStatement(ss, F.Assignment(left, right))
));
return UpdateExpression(ssLeft, left);
}
return UpdateExpression(ss, node.Update(left, right, node.LeftConversion, node.Type));
}
public override BoundNode VisitBinaryOperator(BoundBinaryOperator node)
{
BoundSpillSequence2 ss = null;
var right = VisitExpression(ref ss, node.Right);
BoundExpression left;
if (ss == null)
{
left = VisitExpression(ref ss, node.Left);
}
else
{
var ssLeft = new BoundSpillSequence2();
left = VisitExpression(ref ssLeft, node.Left);
left = Spill(ssLeft, left);
if (node.OperatorKind == BinaryOperatorKind.LogicalBoolOr || node.OperatorKind == BinaryOperatorKind.LogicalBoolAnd)
{
ssLeft.Add(F.If(
node.OperatorKind == BinaryOperatorKind.LogicalBoolAnd ? left : F.Not(left),
UpdateStatement(ss, F.Assignment(left, right))
));
return UpdateExpression(ssLeft, left);
}
else
{
// if the right-hand-side has await, spill the left
ssLeft.IncludeSequence(ss);
ss = ssLeft;
}
}
return UpdateExpression(ss, node.Update(node.OperatorKind, left, right, node.ConstantValue, node.MethodOpt, node.ResultKind, node.Type));
}
public override BoundNode VisitCall(BoundCall node)
{
BoundSpillSequence2 ss = null;
var arguments = this.VisitExpressionList(ref ss, node.Arguments, node.ArgumentRefKindsOpt);
BoundExpression receiver = null;
if (ss == null)
{
receiver = VisitExpression(ref ss, node.ReceiverOpt);
}
else if (!node.Method.IsStatic)
{
// spill the receiver if there were await expressions in the arguments
var ss2 = new BoundSpillSequence2();
receiver = Spill(ss2, VisitExpression(ref ss2, node.ReceiverOpt), refKind: node.ReceiverOpt.Type.IsReferenceType ? RefKind.None : RefKind.Ref);
ss2.IncludeSequence(ss);
ss = ss2;
}
return UpdateExpression(ss, node.Update(receiver, node.Method, arguments));
}
public override BoundNode VisitArrayCreation(BoundArrayCreation node)
{
BoundSpillSequence2 ss = null;
var init = (BoundArrayInitialization)VisitExpression(ref ss, node.InitializerOpt);
ImmutableArray<BoundExpression> bounds;
if (ss == null)
{
bounds = VisitExpressionList(ref ss, node.Bounds);
}
else
{
// spill bounds expressions if initializers contain await
var ss2 = new BoundSpillSequence2();
bounds = VisitExpressionList(ref ss2, node.Bounds, forceSpill: true);
ss2.IncludeSequence(ss);
ss = ss2;
}
return UpdateExpression(ss, node.Update(bounds, init, node.Type));
}
public override BoundNode VisitAssignmentOperator(BoundAssignmentOperator node)
{
BoundSpillSequence2 ss = null;
var right = VisitExpression(ref ss, node.Right);
BoundExpression left;
if (ss == null || node.Left.Kind == BoundKind.Local)
{
left = VisitExpression(ref ss, node.Left);
}
else
{
// if the right-hand-side has await, spill the left
var ss2 = new BoundSpillSequence2();
left = VisitExpression(ref ss2, node.Left);
if (left.Kind != BoundKind.Local) left = Spill(ss2, left, RefKind.Ref);
ss2.IncludeSequence(ss);
ss = ss2;
}
return UpdateExpression(ss, node.Update(left, right, node.RefKind, node.Type));
}
public override BoundNode VisitArrayAccess(BoundArrayAccess node)
{
BoundSpillSequence2 ssArray = null;
var expression = VisitExpression(ref ssArray, node.Expression);
BoundSpillSequence2 ssIndices = null;
var indices = this.VisitExpressionList(ref ssIndices, node.Indices);
if (ssIndices != null)
{
// spill the array if there were await expressions in the indices
if (ssArray == null) ssArray = new BoundSpillSequence2();
expression = Spill(ssArray, expression);
}
if (ssArray != null)
{
ssArray.IncludeSequence(ssIndices);
ssIndices = ssArray;
ssArray = null;
}
return UpdateExpression(ssIndices, node.Update(expression, indices, node.Type));
}
private ImmutableArray<BoundExpression> VisitExpressionList(
ref BoundSpillSequence2 spill,
ImmutableArray<BoundExpression> args,
ImmutableArray<RefKind> refKinds = default(ImmutableArray<RefKind>),
bool forceSpill = false,
bool sideEffectsOnly = false)
{
var newList = VisitList(args);
int lastSpill;
if (forceSpill)
{
lastSpill = args.Length - 1;
}
else
{
lastSpill = -1;
for (int i = 0; i < newList.Length; i++)
{
if (newList[i].Kind == SpillSequence2) lastSpill = i;
}
}
if (lastSpill == -1) return newList;
if (spill == null) spill = new BoundSpillSequence2();
var builder = ArrayBuilder<BoundExpression>.GetInstance();
for (int i = 0; i <= lastSpill; i++)
{
var replacement = Spill(spill, newList[i], (!refKinds.IsDefaultOrEmpty && refKinds.Length > i && refKinds[i] != RefKind.None) ? RefKind.Ref : RefKind.None, sideEffectsOnly);
Debug.Assert(sideEffectsOnly || replacement != null);
if (!sideEffectsOnly) builder.Add(replacement);
}
for (int i = lastSpill + 1; i < newList.Length; i++)
{
builder.Add(newList[i]);
}
return builder.ToImmutableAndFree();
}
private static BoundExpression UpdateExpression(BoundSpillSequence2 ss, BoundExpression expression)
{
if (ss == null) return expression;
Debug.Assert(ss.Value == null);
if (ss.Locals.Length == 0 && ss.Statements.Length == 0)
{
ss.Free();
return expression;
}
return ss.Update(expression);
}
public override BoundNode VisitAwaitExpression(BoundAwaitExpression node)
{
var ss = new BoundSpillSequence2();
var replacement = VisitExpression(ref ss, node);
return ss.Update(replacement);
}
private BoundStatement UpdateStatement(BoundSpillSequence2 ss, BoundStatement stmt)
{
if (ss == null)
{
Debug.Assert(stmt != null);
return stmt;
}
Debug.Assert(ss.Value == null);
if (stmt != null) ss.Add(stmt);
var result = F.Block(ss.Locals, ss.Statements);
ss.Free();
return result;
}