private void EvaluateExpressionStatement(BoundExpressionStatement statement)
{
_lastValue = EvaluateExpression(statement.Expression);
}
public override BoundNode VisitExpressionStatement(BoundExpressionStatement node)
{
// NOTE: not using a BoundNoOpStatement, since we don't want a nop to be emitted.
// CONSIDER: could use a BoundNoOpStatement (DevDiv #12943).
return(RewriteExpressionStatement(node) ?? BoundStatementList.Synthesized(node.Syntax));
}
public virtual void VisitExpressionStatement(BoundExpressionStatement node)
{
DefaultVisit(node);
}
public override BoundNode VisitExpressionStatement(BoundExpressionStatement node)
{
// If the expression is the expression of an expression statement,
// we don't have to introduce an expression block and instead
// just change it to a set variable. We also specifically
// don't visit the expression because (1) this is if no use
// because the only thing it could do is set the result temporary
// which we're assigning here anyway and (2) this way we don't
// need to have a special case in Visit.
if (_resultExpressions.Contains(node.Expression))
{
return new BoundSetVariable(
_resultTemporary,
node.Expression,
node.Location
);
}
return base.VisitExpressionStatement(node);
}
public override BoundNode VisitExpressionStatement(BoundExpressionStatement node)
{
// expressions do not contain labels or branches
return node;
}
// private static T <Factory>(object[] submissionArray)
// {
// var submission = new Submission#N(submissionArray);
// return submission.<Initialize>();
// }
internal override BoundBlock CreateBody(DiagnosticBag diagnostics)
{
var syntax = DummySyntax();
var ctor = _containingType.GetScriptConstructor();
Debug.Assert(ctor.ParameterCount == 1);
var initializer = _containingType.GetScriptInitializer();
Debug.Assert(initializer.ParameterCount == 0);
var submissionArrayParameter = new BoundParameter(syntax, _parameters[0])
{
WasCompilerGenerated = true
};
var submissionLocal = new BoundLocal(
syntax,
new SynthesizedLocal(this, TypeWithAnnotations.Create(_containingType), SynthesizedLocalKind.LoweringTemp),
null,
_containingType)
{
WasCompilerGenerated = true
};
// var submission = new Submission#N(submissionArray);
var submissionAssignment = new BoundExpressionStatement(
syntax,
new BoundAssignmentOperator(
syntax,
submissionLocal,
new BoundObjectCreationExpression(
syntax,
ctor,
ImmutableArray.Create <BoundExpression>(submissionArrayParameter),
default(ImmutableArray <string>),
default(ImmutableArray <RefKind>),
false,
default(ImmutableArray <int>),
null,
null,
null,
_containingType)
{
WasCompilerGenerated = true
},
_containingType)
{
WasCompilerGenerated = true
})
{
WasCompilerGenerated = true
};
// return submission.<Initialize>();
var initializeResult = CreateParameterlessCall(
syntax,
submissionLocal,
initializer);
Debug.Assert(TypeSymbol.Equals(initializeResult.Type, _returnType.Type, TypeCompareKind.ConsiderEverything2));
var returnStatement = new BoundReturnStatement(
syntax,
RefKind.None,
initializeResult)
{
WasCompilerGenerated = true
};
return(new BoundBlock(syntax,
ImmutableArray.Create <LocalSymbol>(submissionLocal.LocalSymbol),
ImmutableArray.Create <BoundStatement>(submissionAssignment, returnStatement))
{
WasCompilerGenerated = true
});
}
// private static T <Factory>(object[] submissionArray)
// {
// var submission = new Submission#N(submissionArray);
// return submission.<Initialize>();
// }
internal override BoundBlock CreateBody()
{
var syntax = this.GetSyntax();
var ctor = _containingType.GetScriptConstructor();
Debug.Assert(ctor.ParameterCount == 1);
var initializer = _containingType.GetScriptInitializer();
Debug.Assert(initializer.ParameterCount == 0);
var submissionArrayParameter = new BoundParameter(syntax, _parameters[0]) { WasCompilerGenerated = true };
var submissionLocal = new BoundLocal(
syntax,
new SynthesizedLocal(this, _containingType, SynthesizedLocalKind.LoweringTemp),
null,
_containingType)
{ WasCompilerGenerated = true };
// var submission = new Submission#N(submissionArray);
var submissionAssignment = new BoundExpressionStatement(
syntax,
new BoundAssignmentOperator(
syntax,
submissionLocal,
new BoundObjectCreationExpression(
syntax,
ctor,
ImmutableArray.Create<BoundExpression>(submissionArrayParameter),
default(ImmutableArray<string>),
default(ImmutableArray<RefKind>),
false,
default(ImmutableArray<int>),
null,
null,
_containingType)
{ WasCompilerGenerated = true },
_containingType)
{ WasCompilerGenerated = true })
{ WasCompilerGenerated = true };
// return submission.<Initialize>();
BoundExpression initializeResult = new BoundCall(
syntax,
submissionLocal,
initializer,
ImmutableArray<BoundExpression>.Empty,
default(ImmutableArray<string>),
default(ImmutableArray<RefKind>),
isDelegateCall: false,
expanded: false,
invokedAsExtensionMethod: false,
argsToParamsOpt: default(ImmutableArray<int>),
resultKind: LookupResultKind.Viable,
type: initializer.ReturnType)
{ WasCompilerGenerated = true };
if (initializeResult.Type.IsStructType() && (_returnType.SpecialType == SpecialType.System_Object))
{
initializeResult = new BoundConversion(syntax, initializeResult, Conversion.Boxing, false, true, ConstantValue.NotAvailable, _returnType)
{ WasCompilerGenerated = true };
}
var returnStatement = new BoundReturnStatement(
syntax,
initializeResult)
{ WasCompilerGenerated = true };
return new BoundBlock(syntax,
ImmutableArray.Create<LocalSymbol>(submissionLocal.LocalSymbol),
ImmutableArray.Create<BoundStatement>(submissionAssignment, returnStatement))
{ WasCompilerGenerated = true };
}
/// <summary>
/// Lowers a lock statement to a try-finally block that calls Monitor.Enter and Monitor.Exit
/// before and after the body, respectively.
/// </summary>
public override BoundNode VisitLockStatement(BoundLockStatement node)
{
LockStatementSyntax lockSyntax = (LockStatementSyntax)node.Syntax;
BoundExpression rewrittenArgument = VisitExpression(node.Argument);
BoundStatement rewrittenBody = (BoundStatement)Visit(node.Body);
TypeSymbol argumentType = rewrittenArgument.Type;
if ((object)argumentType == null)
{
// This isn't particularly elegant, but hopefully locking on null is
// not very common.
Debug.Assert(rewrittenArgument.ConstantValue == ConstantValue.Null);
argumentType = _compilation.GetSpecialType(SpecialType.System_Object);
rewrittenArgument = MakeLiteral(
rewrittenArgument.Syntax,
rewrittenArgument.ConstantValue,
argumentType); //need to have a non-null type here for TempHelpers.StoreToTemp.
}
BoundAssignmentOperator assignmentToLockTemp;
BoundLocal boundLockTemp = _factory.StoreToTemp(rewrittenArgument, out assignmentToLockTemp, syntaxOpt: lockSyntax, kind: SynthesizedLocalKind.Lock);
BoundStatement boundLockTempInit = new BoundExpressionStatement(lockSyntax, assignmentToLockTemp);
BoundExpression exitCallExpr;
MethodSymbol exitMethod;
if (TryGetWellKnownTypeMember(lockSyntax, WellKnownMember.System_Threading_Monitor__Exit, out exitMethod))
{
exitCallExpr = BoundCall.Synthesized(
lockSyntax,
null,
exitMethod,
boundLockTemp);
}
else
{
exitCallExpr = new BoundBadExpression(lockSyntax, LookupResultKind.NotInvocable, ImmutableArray <Symbol> .Empty, ImmutableArray.Create <BoundExpression>(boundLockTemp), ErrorTypeSymbol.UnknownResultType);
}
BoundStatement exitCall = new BoundExpressionStatement(lockSyntax, exitCallExpr);
MethodSymbol enterMethod;
if ((TryGetWellKnownTypeMember(lockSyntax, WellKnownMember.System_Threading_Monitor__Enter2, out enterMethod, isOptional: true) ||
TryGetWellKnownTypeMember(lockSyntax, WellKnownMember.System_Threading_Monitor__Enter, out enterMethod)) && // If we didn't find the overload introduced in .NET 4.0, then use the older one.
enterMethod.ParameterCount == 2)
{
// C# 4.0+ version
// L $lock = `argument`; // sequence point
// bool $lockTaken = false;
// try
// {
// Monitor.Enter($lock, ref $lockTaken);
// `body` // sequence point
// }
// finally
// { // hidden sequence point
// if ($lockTaken) Monitor.Exit($lock);
// }
TypeSymbol boolType = _compilation.GetSpecialType(SpecialType.System_Boolean);
BoundAssignmentOperator assignmentToLockTakenTemp;
BoundLocal boundLockTakenTemp = _factory.StoreToTemp(
MakeLiteral(rewrittenArgument.Syntax, ConstantValue.False, boolType),
store: out assignmentToLockTakenTemp,
syntaxOpt: lockSyntax,
kind: SynthesizedLocalKind.LockTaken);
BoundStatement boundLockTakenTempInit = new BoundExpressionStatement(lockSyntax, assignmentToLockTakenTemp);
BoundStatement enterCall = new BoundExpressionStatement(
lockSyntax,
BoundCall.Synthesized(
lockSyntax,
null,
enterMethod,
boundLockTemp,
boundLockTakenTemp));
exitCall = RewriteIfStatement(
lockSyntax,
boundLockTakenTemp,
exitCall,
null,
node.HasErrors);
return(new BoundBlock(
lockSyntax,
ImmutableArray.Create(boundLockTemp.LocalSymbol, boundLockTakenTemp.LocalSymbol),
ImmutableArray.Create(
InstrumentLockTargetCapture(node, boundLockTempInit),
boundLockTakenTempInit,
new BoundTryStatement(
lockSyntax,
BoundBlock.SynthesizedNoLocals(lockSyntax, ImmutableArray.Create(
enterCall,
rewrittenBody)),
ImmutableArray <BoundCatchBlock> .Empty,
BoundBlock.SynthesizedNoLocals(lockSyntax,
exitCall)))));
}
else
{
// Pre-4.0 version
// L $lock = `argument`; // sequence point
// Monitor.Enter($lock); // NB: before try-finally so we don't Exit if an exception prevents us from acquiring the lock.
// try
// {
// `body` // sequence point
// }
// finally
// {
// Monitor.Exit($lock); // hidden sequence point
// }
BoundExpression enterCallExpr;
if ((object)enterMethod != null)
{
Debug.Assert(enterMethod.ParameterCount == 1);
enterCallExpr = BoundCall.Synthesized(
lockSyntax,
null,
enterMethod,
boundLockTemp);
}
else
{
enterCallExpr = new BoundBadExpression(lockSyntax, LookupResultKind.NotInvocable, ImmutableArray <Symbol> .Empty, ImmutableArray.Create <BoundExpression>(boundLockTemp), ErrorTypeSymbol.UnknownResultType);
}
BoundStatement enterCall = new BoundExpressionStatement(
lockSyntax,
enterCallExpr);
return(new BoundBlock(
lockSyntax,
ImmutableArray.Create(boundLockTemp.LocalSymbol),
ImmutableArray.Create(
InstrumentLockTargetCapture(node, boundLockTempInit),
enterCall,
new BoundTryStatement(
lockSyntax,
BoundBlock.SynthesizedNoLocals(lockSyntax, rewrittenBody),
ImmutableArray <BoundCatchBlock> .Empty,
BoundBlock.SynthesizedNoLocals(lockSyntax, exitCall)))));
}
}
// private static T <Factory>(object[] submissionArray)
// {
// var submission = new Submission#N(submissionArray);
// return submission.<Initialize>();
// }
internal override BoundBlock CreateBody()
{
var syntax = this.GetSyntax();
var ctor = _containingType.GetScriptConstructor();
Debug.Assert(ctor.ParameterCount == 1);
var initializer = _containingType.GetScriptInitializer();
Debug.Assert(initializer.ParameterCount == 0);
var submissionArrayParameter = new BoundParameter(syntax, _parameters[0])
{
WasCompilerGenerated = true
};
var submissionLocal = new BoundLocal(
syntax,
new SynthesizedLocal(this, _containingType, SynthesizedLocalKind.LoweringTemp),
null,
_containingType)
{
WasCompilerGenerated = true
};
// var submission = new Submission#N(submissionArray);
var submissionAssignment = new BoundExpressionStatement(
syntax,
new BoundAssignmentOperator(
syntax,
submissionLocal,
new BoundObjectCreationExpression(
syntax,
ctor,
ImmutableArray.Create <BoundExpression>(submissionArrayParameter),
default(ImmutableArray <string>),
default(ImmutableArray <RefKind>),
false,
default(ImmutableArray <int>),
null,
null,
_containingType)
{
WasCompilerGenerated = true
},
_containingType)
{
WasCompilerGenerated = true
})
{
WasCompilerGenerated = true
};
// return submission.<Initialize>();
BoundExpression initializeResult = new BoundCall(
syntax,
submissionLocal,
initializer,
ImmutableArray <BoundExpression> .Empty,
default(ImmutableArray <string>),
default(ImmutableArray <RefKind>),
isDelegateCall: false,
expanded: false,
invokedAsExtensionMethod: false,
argsToParamsOpt: default(ImmutableArray <int>),
resultKind: LookupResultKind.Viable,
type: initializer.ReturnType)
{
WasCompilerGenerated = true
};
if (initializeResult.Type.IsStructType() && (_returnType.SpecialType == SpecialType.System_Object))
{
initializeResult = new BoundConversion(syntax, initializeResult, Conversion.Boxing, false, true, ConstantValue.NotAvailable, _returnType)
{
WasCompilerGenerated = true
};
}
var returnStatement = new BoundReturnStatement(
syntax,
initializeResult)
{
WasCompilerGenerated = true
};
return(new BoundBlock(syntax,
ImmutableArray.Create <LocalSymbol>(submissionLocal.LocalSymbol),
ImmutableArray.Create <BoundStatement>(submissionAssignment, returnStatement))
{
WasCompilerGenerated = true
});
}
public override BoundNode VisitExpressionStatement(BoundExpressionStatement node)
{
// Avoid rewriting if node has errors since
// the expression may be invalid.
if (node.HasErrors)
{
return node;
}
var assignmentOperator = node.Expression as BoundAssignmentOperator;
if (assignmentOperator != null)
{
// Avoid extra temporary by indicating the expression value is not used.
var expr = VisitAssignmentOperator(assignmentOperator, used: false);
return node.Update(expr);
}
else
{
return base.VisitExpressionStatement(node);
}
}
protected override BoundExpression RewriteForExpression(BoundForExpression node)
{
/*
* convert from for to while
*
* for (x <- l to u) expr
*
* var x = l
* while(x < u) {
* expr
* continue:
* x = x + 1
* }
*/
var lowerBound = RewriteExpression(node.LowerBound);
var upperBound = RewriteExpression(node.UpperBound);
var body = RewriteExpression(node.Body);
var declareX = new BoundVariableDeclarationStatement(
node.Syntax,
node.Variable,
lowerBound
);
var variableExpression = ValueExpression(node.Syntax, node.Variable);
var condition = new BoundBinaryExpression(
node.Syntax,
variableExpression,
BoundBinaryOperator.BindOrThrow(SyntaxKind.LessThanToken, Type.Int, Type.Int),
upperBound
);
var continueLabelStatement = new BoundLabelStatement(node.Syntax, node.ContinueLabel);
var incrementX = new BoundExpressionStatement(
node.Syntax,
new BoundAssignmentExpression(
node.Syntax,
variableExpression,
new BoundBinaryExpression(
node.Syntax,
variableExpression,
BoundBinaryOperator.BindOrThrow(SyntaxKind.PlusToken, Type.Int, Type.Int),
new BoundLiteralExpression(node.Syntax, 1)
)
)
);
var whileBody = new BoundBlockExpression(
node.Syntax,
ImmutableArray.Create <BoundStatement>(
new BoundExpressionStatement(body.Syntax, body),
continueLabelStatement,
incrementX
),
new BoundUnitExpression(node.Syntax)
);
var newBlock = new BoundBlockExpression(
node.Syntax,
ImmutableArray.Create <BoundStatement>(declareX),
new BoundWhileExpression(
node.Syntax,
condition,
whileBody,
node.BreakLabel,
new BoundLabel("continue")
)
);
return(RewriteExpression(newBlock));
}
private object EvaluateExpressionStatement(BoundExpressionStatement statement)
{
return(EvaluateExpression(statement.Expression));
}
public override object VisitExpressionStatement(BoundExpressionStatement node, object arg)
{
VisitExpression(node.Expression);
return(null);
}
private DustObject EvaluateExpressionStatement(BoundExpressionStatement expressionStatement)
{
return(EvaluateExpression(expressionStatement.Expression));
}
private void EvaluateExpressionStatement(BoundExpressionStatement node)
{
_lastValue = EvaluateExpression(node.Expression);
}
private void OutputExpressionStatement(BoundExpressionStatement node, string prefix)
{
builder.AddFragment(new OutputFragment(prefix, DefaultColour));
Output(node.Expression, string.Empty);
}
protected override BoundStatement RewriteExpressionStatement(BoundExpressionStatement node)
{
var rewrittenNode = base.RewriteExpressionStatement(node);
return(new BoundSequencePointStatement(rewrittenNode.Syntax, rewrittenNode, rewrittenNode.Syntax.Location));
}
public override BoundStatement InstrumentExpressionStatement(BoundExpressionStatement original, BoundStatement rewritten)
{
return(Previous.InstrumentExpressionStatement(original, rewritten));
}
public override void VisitExpressionStatement(BoundExpressionStatement node)
{
node.Expression.Accept(this);
_writer.WriteLine();
}
protected virtual void VisitExpressionStatement(BoundExpressionStatement node)
{
VisitExpression(node.Expression);
}
/// <summary>
/// Lower a foreach loop that will enumerate a collection using an enumerator.
///
/// E e = ((C)(x)).GetEnumerator()
/// try {
/// while (e.MoveNext()) {
/// V v = (V)(T)e.Current;
/// // body
/// }
/// }
/// finally {
/// // clean up e
/// }
/// </summary>
private BoundStatement RewriteEnumeratorForEachStatement(BoundForEachStatement node)
{
ForEachStatementSyntax forEachSyntax = (ForEachStatementSyntax)node.Syntax;
ForEachEnumeratorInfo enumeratorInfo = node.EnumeratorInfoOpt;
Debug.Assert(enumeratorInfo != null);
BoundExpression collectionExpression = GetUnconvertedCollectionExpression(node);
BoundExpression rewrittenExpression = (BoundExpression)Visit(collectionExpression);
BoundStatement rewrittenBody = (BoundStatement)Visit(node.Body);
TypeSymbol enumeratorType = enumeratorInfo.GetEnumeratorMethod.ReturnType;
TypeSymbol elementType = enumeratorInfo.ElementType;
// E e
LocalSymbol enumeratorVar = new TempLocalSymbol(enumeratorType, RefKind.None, this.containingMethod);
// Reference to e.
BoundLocal boundEnumeratorVar = MakeBoundLocal(forEachSyntax, enumeratorVar, enumeratorType);
// ((C)(x)).GetEnumerator() or (x).GetEnumerator();
BoundExpression enumeratorVarInitValue = SynthesizeCall(forEachSyntax, rewrittenExpression, enumeratorInfo.GetEnumeratorMethod, enumeratorInfo.CollectionConversion, enumeratorInfo.CollectionType);
// E e = ((C)(x)).GetEnumerator();
BoundStatement enumeratorVarDecl = MakeLocalDeclaration(forEachSyntax, enumeratorVar, enumeratorVarInitValue);
AddForEachExpressionSequencePoint(forEachSyntax, ref enumeratorVarDecl);
// V v
LocalSymbol iterationVar = node.IterationVariable;
//(V)(T)e.Current
BoundExpression iterationVarAssignValue = SynthesizeConversion(
syntax: forEachSyntax,
operand: SynthesizeConversion(
syntax: forEachSyntax,
operand: BoundCall.Synthesized(
syntax: forEachSyntax,
receiverOpt: boundEnumeratorVar,
method: enumeratorInfo.CurrentPropertyGetter),
conversion: enumeratorInfo.CurrentConversion,
type: elementType),
conversion: node.ElementConversion,
type: iterationVar.Type);
// V v = (V)(T)e.Current;
BoundStatement iterationVarDecl = MakeLocalDeclaration(forEachSyntax, iterationVar, iterationVarAssignValue);
AddForEachIterationVariableSequencePoint(forEachSyntax, ref iterationVarDecl);
// while (e.MoveNext()) {
// V v = (V)(T)e.Current;
// /* node.Body */
// }
BoundStatement whileLoop = RewriteWhileStatement(
syntax: forEachSyntax,
rewrittenCondition: BoundCall.Synthesized(
syntax: forEachSyntax,
receiverOpt: boundEnumeratorVar,
method: enumeratorInfo.MoveNextMethod),
conditionSequencePointSpan: forEachSyntax.InKeyword.Span,
rewrittenBody: new BoundBlock(rewrittenBody.Syntax,
statements: ReadOnlyArray<BoundStatement>.CreateFrom(iterationVarDecl, rewrittenBody),
localsOpt: ReadOnlyArray<LocalSymbol>.CreateFrom(iterationVar)),
breakLabel: node.BreakLabel,
continueLabel: node.ContinueLabel,
hasErrors: false);
BoundStatement result;
if (enumeratorInfo.DisposeMethodOpt != null)
{
BoundBlock finallyBlockOpt;
var idisposableTypeSymbol = enumeratorInfo.DisposeMethodOpt.ContainingType;
var conversions = new TypeConversions(this.containingMethod.ContainingAssembly.CorLibrary);
if (conversions.ClassifyImplicitConversion(enumeratorType, idisposableTypeSymbol).IsImplicit)
{
Debug.Assert(enumeratorInfo.DisposeMethodOpt != null);
Conversion receiverConversion = enumeratorType.IsStructType() ?
Conversion.Boxing :
Conversion.ImplicitReference;
// ((IDisposable)e).Dispose(); or e.Dispose();
BoundStatement disposeCall = new BoundExpressionStatement(forEachSyntax,
expression: SynthesizeCall(forEachSyntax, boundEnumeratorVar, enumeratorInfo.DisposeMethodOpt, receiverConversion, idisposableTypeSymbol));
BoundStatement disposeStmt;
if (enumeratorType.IsValueType)
{
// No way for the struct to be nullable and disposable.
Debug.Assert(((TypeSymbol)enumeratorType.OriginalDefinition).SpecialType != SpecialType.System_Nullable_T);
// For non-nullable structs, no null check is required.
disposeStmt = disposeCall;
}
else
{
// NB: cast to object missing from spec. Needed to ignore user-defined operators and box type parameters.
// if ((object)e != null) ((IDisposable)e).Dispose();
disposeStmt = RewriteIfStatement(
syntax: forEachSyntax,
rewrittenCondition: new BoundBinaryOperator(forEachSyntax,
operatorKind: BinaryOperatorKind.NotEqual,
left: SynthesizeConversion(
syntax: forEachSyntax,
operand: boundEnumeratorVar,
conversion: enumeratorInfo.EnumeratorConversion,
type: this.compilation.GetSpecialType(SpecialType.System_Object)),
right: new BoundLiteral(forEachSyntax,
constantValueOpt: ConstantValue.Null,
type: null),
constantValueOpt: null,
methodOpt: null,
resultKind: LookupResultKind.Viable,
type: this.compilation.GetSpecialType(SpecialType.System_Boolean)),
rewrittenConsequence: disposeCall,
rewrittenAlternativeOpt: null,
hasErrors: false);
}
finallyBlockOpt = new BoundBlock(forEachSyntax,
localsOpt: ReadOnlyArray<LocalSymbol>.Null,
statements: ReadOnlyArray<BoundStatement>.CreateFrom(disposeStmt));
}
else
{
Debug.Assert(!enumeratorType.IsSealed);
// IDisposable d
LocalSymbol disposableVar = new TempLocalSymbol(idisposableTypeSymbol, RefKind.None, this.containingMethod);
// Reference to d.
BoundLocal boundDisposableVar = MakeBoundLocal(forEachSyntax, disposableVar, idisposableTypeSymbol);
BoundTypeExpression boundIDisposableTypeExpr = new BoundTypeExpression(forEachSyntax,
type: idisposableTypeSymbol);
// e as IDisposable
BoundExpression disposableVarInitValue = new BoundAsOperator(forEachSyntax,
operand: boundEnumeratorVar,
targetType: boundIDisposableTypeExpr,
conversion: Conversion.ExplicitReference, // Explicit so the emitter won't optimize it away.
type: idisposableTypeSymbol);
// IDisposable d = e as IDisposable;
BoundStatement disposableVarDecl = MakeLocalDeclaration(forEachSyntax, disposableVar, disposableVarInitValue);
// if (d != null) d.Dispose();
BoundStatement ifStmt = RewriteIfStatement(
syntax: forEachSyntax,
rewrittenCondition: new BoundBinaryOperator(forEachSyntax,
operatorKind: BinaryOperatorKind.NotEqual, // reference equality
left: boundDisposableVar,
right: new BoundLiteral(forEachSyntax,
constantValueOpt: ConstantValue.Null,
type: null),
constantValueOpt: null,
methodOpt: null,
resultKind: LookupResultKind.Viable,
type: this.compilation.GetSpecialType(SpecialType.System_Boolean)),
rewrittenConsequence: new BoundExpressionStatement(forEachSyntax,
expression: BoundCall.Synthesized(
syntax: forEachSyntax,
receiverOpt: boundDisposableVar,
method: enumeratorInfo.DisposeMethodOpt)),
rewrittenAlternativeOpt: null,
hasErrors: false);
// IDisposable d = e as IDisposable;
// if (d != null) d.Dispose();
finallyBlockOpt = new BoundBlock(forEachSyntax,
localsOpt: ReadOnlyArray<LocalSymbol>.CreateFrom(disposableVar),
statements: ReadOnlyArray<BoundStatement>.CreateFrom(disposableVarDecl, ifStmt));
}
// try {
// while (e.MoveNext()) {
// V v = (V)(T)e.Current;
// /* loop body */
// }
// }
// finally {
// /* dispose of e */
// }
BoundStatement tryFinally = new BoundTryStatement(forEachSyntax,
tryBlock: new BoundBlock(forEachSyntax,
localsOpt: ReadOnlyArray<LocalSymbol>.Empty,
statements: ReadOnlyArray<BoundStatement>.CreateFrom(whileLoop)),
catchBlocks: ReadOnlyArray<BoundCatchBlock>.Empty,
finallyBlockOpt: finallyBlockOpt);
// E e = ((C)(x)).GetEnumerator();
// try {
// /* as above */
result = new BoundBlock(
syntax: forEachSyntax,
localsOpt: ReadOnlyArray<LocalSymbol>.CreateFrom(enumeratorVar),
statements: ReadOnlyArray<BoundStatement>.CreateFrom(enumeratorVarDecl, tryFinally));
}
else
{
// E e = ((C)(x)).GetEnumerator();
// while (e.MoveNext()) {
// V v = (V)(T)e.Current;
// /* loop body */
// }
result = new BoundBlock(
syntax: forEachSyntax,
localsOpt: ReadOnlyArray<LocalSymbol>.CreateFrom(enumeratorVar),
statements: ReadOnlyArray<BoundStatement>.CreateFrom(enumeratorVarDecl, whileLoop));
}
AddForEachKeywordSequencePoint(forEachSyntax, ref result);
return result;
}
public override void VisitExpressionStatement(BoundExpressionStatement node)
{
base.VisitExpressionStatement(node);
_branch.MarkExpression(node.Expression);
}
// private static T <Factory>(object[] submissionArray)
// {
// var submission = new Submission#N(submissionArray);
// return submission.<Initialize>();
// }
internal override BoundBlock CreateBody()
{
var syntax = this.GetSyntax();
var ctor = _containingType.GetScriptConstructor();
Debug.Assert(ctor.ParameterCount == 1);
var initializer = _containingType.GetScriptInitializer();
Debug.Assert(initializer.ParameterCount == 0);
var submissionArrayParameter = new BoundParameter(syntax, _parameters[0]) { WasCompilerGenerated = true };
var submissionLocal = new BoundLocal(
syntax,
new SynthesizedLocal(this, _containingType, SynthesizedLocalKind.LoweringTemp),
null,
_containingType)
{ WasCompilerGenerated = true };
// var submission = new Submission#N(submissionArray);
var submissionAssignment = new BoundExpressionStatement(
syntax,
new BoundAssignmentOperator(
syntax,
submissionLocal,
new BoundObjectCreationExpression(
syntax,
ctor,
ImmutableArray.Create<BoundExpression>(submissionArrayParameter),
default(ImmutableArray<string>),
default(ImmutableArray<RefKind>),
false,
default(ImmutableArray<int>),
null,
null,
_containingType)
{ WasCompilerGenerated = true },
_containingType)
{ WasCompilerGenerated = true })
{ WasCompilerGenerated = true };
// return submission.<Initialize>();
var initializeResult = CreateParameterlessCall(
syntax,
submissionLocal,
initializer);
Debug.Assert(initializeResult.Type == _returnType);
var returnStatement = new BoundReturnStatement(
syntax,
RefKind.None,
initializeResult)
{ WasCompilerGenerated = true };
return new BoundBlock(syntax,
ImmutableArray.Create<LocalSymbol>(submissionLocal.LocalSymbol),
ImmutableArray<LocalFunctionSymbol>.Empty,
ImmutableArray.Create<BoundStatement>(submissionAssignment, returnStatement))
{ WasCompilerGenerated = true };
}
public override object VisitExpressionStatement(BoundExpressionStatement x)
{
return(x.Update((BoundExpression)Accept(x.Expression)));
}
public override BoundNode VisitExpressionStatement(BoundExpressionStatement node)
{
return node.Update(
this.VisitExpression(node.Expression, ExprContext.Sideeffects));
}
private void EmitExpressionStatement(BoundExpressionStatement node)
{
EmitPop(EmitExpression(node.Expression));
}