private BoundExpression RewriteLocal(BoundLocal node)
{
var local = node.LocalSymbol;
var placeholder = local as PlaceholderLocalSymbol;
if ((object)placeholder != null)
{
return placeholder.RewriteLocal(_compilation, _container, node.Syntax, _diagnostics);
}
if (_declaredLocals.Contains(local))
{
return ObjectIdLocalSymbol.RewriteLocal(_compilation, _container, node.Syntax, local);
}
return node;
}
public override BoundNode VisitLocal(BoundLocal node)
{
var local = node.LocalSymbol;
if (!local.IsCompilerGenerated)
{
var variable = this.GetVariable(local.Name);
if (variable != null)
{
var result = variable.ToBoundExpression(node.Syntax);
Debug.Assert(node.Type == result.Type);
return result;
}
}
return node;
}
private void EmitLocalAddress(BoundLocal localAccess)
{
var local = localAccess.LocalSymbol;
if (IsStackLocal(local))
{
if (local.RefKind != RefKind.None)
{
// do nothing, ref should be on the stack
}
else
{
// cannot get address of a stack value.
// Something is wrong with optimizer
throw ExceptionUtilities.UnexpectedValue(local.RefKind);
}
}
else
{
builder.EmitLocalAddress(GetLocal(localAccess));
}
}
/// <summary>
/// Generate a class containing methods that represent
/// the set of arguments and locals at the current scope.
/// </summary>
internal CommonPEModuleBuilder CompileGetLocals(
string typeName,
ArrayBuilder<LocalAndMethod> localBuilder,
bool argumentsOnly,
ImmutableArray<Alias> aliases,
Microsoft.CodeAnalysis.CodeGen.CompilationTestData testData,
DiagnosticBag diagnostics)
{
var objectType = this.Compilation.GetSpecialType(SpecialType.System_Object);
var allTypeParameters = _currentFrame.GetAllTypeParameters();
var additionalTypes = ArrayBuilder<NamedTypeSymbol>.GetInstance();
EENamedTypeSymbol typeVariablesType = null;
if (!argumentsOnly && (allTypeParameters.Length > 0))
{
// Generate a generic type with matching type parameters.
// A null instance of the type will be used to represent the
// "Type variables" local.
typeVariablesType = new EENamedTypeSymbol(
this.Compilation.SourceModule.GlobalNamespace,
objectType,
_syntax,
_currentFrame,
ExpressionCompilerConstants.TypeVariablesClassName,
(m, t) => ImmutableArray.Create<MethodSymbol>(new EEConstructorSymbol(t)),
allTypeParameters,
(t1, t2) => allTypeParameters.SelectAsArray((tp, i, t) => (TypeParameterSymbol)new SimpleTypeParameterSymbol(t, i, tp.Name), t2));
additionalTypes.Add(typeVariablesType);
}
var synthesizedType = new EENamedTypeSymbol(
Compilation.SourceModule.GlobalNamespace,
objectType,
_syntax,
_currentFrame,
typeName,
(m, container) =>
{
var methodBuilder = ArrayBuilder<MethodSymbol>.GetInstance();
if (!argumentsOnly)
{
// Pseudo-variables: $exception, $ReturnValue, etc.
if (aliases.Length > 0)
{
var sourceAssembly = Compilation.SourceAssembly;
var typeNameDecoder = new EETypeNameDecoder(Compilation, (PEModuleSymbol)_currentFrame.ContainingModule);
foreach (var alias in aliases)
{
if (alias.IsReturnValueWithoutIndex())
{
Debug.Assert(aliases.Count(a => a.Kind == DkmClrAliasKind.ReturnValue) > 1);
continue;
}
var local = PlaceholderLocalSymbol.Create(
typeNameDecoder,
_currentFrame,
sourceAssembly,
alias);
var methodName = GetNextMethodName(methodBuilder);
var syntax = SyntaxFactory.IdentifierName(SyntaxFactory.MissingToken(SyntaxKind.IdentifierToken));
var aliasMethod = this.CreateMethod(container, methodName, syntax, (method, diags) =>
{
var expression = new BoundLocal(syntax, local, constantValueOpt: null, type: local.Type);
return new BoundReturnStatement(syntax, expression) { WasCompilerGenerated = true };
});
var flags = local.IsWritable ? DkmClrCompilationResultFlags.None : DkmClrCompilationResultFlags.ReadOnlyResult;
localBuilder.Add(MakeLocalAndMethod(local, aliasMethod, flags));
methodBuilder.Add(aliasMethod);
}
}
// "this" for non-static methods that are not display class methods or
// display class methods where the display class contains "<>4__this".
if (!m.IsStatic && (!IsDisplayClassType(m.ContainingType) || _displayClassVariables.ContainsKey(GeneratedNames.ThisProxyFieldName())))
{
var methodName = GetNextMethodName(methodBuilder);
var method = this.GetThisMethod(container, methodName);
localBuilder.Add(new CSharpLocalAndMethod("this", "this", method, DkmClrCompilationResultFlags.None)); // Note: writable in dev11.
methodBuilder.Add(method);
}
}
// Hoisted method parameters (represented as locals in the EE).
if (!_hoistedParameterNames.IsEmpty)
{
int localIndex = 0;
foreach (var local in _localsForBinding)
{
// Since we are showing hoisted method parameters first, the parameters may appear out of order
// in the Locals window if only some of the parameters are hoisted. This is consistent with the
// behavior of the old EE.
if (_hoistedParameterNames.Contains(local.Name))
{
AppendLocalAndMethod(localBuilder, methodBuilder, local, container, localIndex, GetLocalResultFlags(local));
}
localIndex++;
}
}
// Method parameters (except those that have been hoisted).
int parameterIndex = m.IsStatic ? 0 : 1;
foreach (var parameter in m.Parameters)
{
var parameterName = parameter.Name;
if (!_hoistedParameterNames.Contains(parameterName) && GeneratedNames.GetKind(parameterName) == GeneratedNameKind.None)
{
AppendParameterAndMethod(localBuilder, methodBuilder, parameter, container, parameterIndex);
}
parameterIndex++;
}
if (!argumentsOnly)
{
// Locals.
int localIndex = 0;
foreach (var local in _localsForBinding)
{
if (!_hoistedParameterNames.Contains(local.Name))
{
AppendLocalAndMethod(localBuilder, methodBuilder, local, container, localIndex, GetLocalResultFlags(local));
}
localIndex++;
}
// "Type variables".
if ((object)typeVariablesType != null)
{
var methodName = GetNextMethodName(methodBuilder);
var returnType = typeVariablesType.Construct(allTypeParameters.Cast<TypeParameterSymbol, TypeSymbol>());
var method = this.GetTypeVariablesMethod(container, methodName, returnType);
localBuilder.Add(new CSharpLocalAndMethod(
ExpressionCompilerConstants.TypeVariablesLocalName,
ExpressionCompilerConstants.TypeVariablesLocalName,
method,
DkmClrCompilationResultFlags.ReadOnlyResult));
methodBuilder.Add(method);
}
}
return methodBuilder.ToImmutableAndFree();
});
additionalTypes.Add(synthesizedType);
var module = CreateModuleBuilder(
this.Compilation,
synthesizedType.Methods,
additionalTypes: additionalTypes.ToImmutableAndFree(),
synthesizedType: synthesizedType,
testData: testData,
diagnostics: diagnostics);
Debug.Assert(module != null);
this.Compilation.Compile(
module,
win32Resources: null,
xmlDocStream: null,
emittingPdb: false,
diagnostics: diagnostics,
filterOpt: null,
cancellationToken: CancellationToken.None);
return diagnostics.HasAnyErrors() ? null : module;
}
// 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 BoundNode VisitLocal(BoundLocal node)
{
CapturedSymbolReplacement proxy;
if (proxies.TryGetValue(node.LocalSymbol, out proxy))
{
return proxy.Replacement(node.Syntax, frameType => FramePointer(node.Syntax, frameType));
}
Debug.Assert(!VariablesCaptured.Contains(node.LocalSymbol));
LocalSymbol replacementLocal;
if (this.localMap.TryGetValue(node.LocalSymbol, out replacementLocal))
{
return new BoundLocal(node.Syntax, replacementLocal, node.ConstantValueOpt, replacementLocal.Type, node.HasErrors);
}
return base.VisitLocal(node);
}
/// <summary>
/// The rewrites are as follows:
///
/// x++
/// temp = x
/// x = temp + 1
/// return temp
/// x--
/// temp = x
/// x = temp - 1
/// return temp
/// ++x
/// temp = x + 1
/// x = temp
/// return temp
/// --x
/// temp = x - 1
/// x = temp
/// return temp
///
/// In each case, the literal 1 is of the type required by the builtin addition/subtraction operator that
/// will be used. The temp is of the same type as x, but the sum/difference may be wider, in which case a
/// conversion is required.
/// </summary>
/// <param name="node">The unary operator expression representing the increment/decrement.</param>
/// <param name="isPrefix">True for prefix, false for postfix.</param>
/// <param name="isIncrement">True for increment, false for decrement.</param>
/// <returns>A bound sequence that uses a temp to acheive the correct side effects and return value.</returns>
private BoundNode LowerOperator(BoundUnaryOperator node, bool isPrefix, bool isIncrement)
{
BoundExpression operand = node.Operand;
TypeSymbol operandType = operand.Type; //type of the variable being incremented
Debug.Assert(operandType == node.Type);
ConstantValue constantOne;
BinaryOperatorKind binaryOperatorKind;
MakeConstantAndOperatorKind(node.OperatorKind.OperandTypes(), node, out constantOne, out binaryOperatorKind);
binaryOperatorKind |= isIncrement ? BinaryOperatorKind.Addition : BinaryOperatorKind.Subtraction;
Debug.Assert(constantOne != null);
Debug.Assert(constantOne.SpecialType != SpecialType.None);
Debug.Assert(binaryOperatorKind.OperandTypes() != 0);
TypeSymbol constantType = compilation.GetSpecialType(constantOne.SpecialType);
BoundExpression boundOne = new BoundLiteral(
syntax: null,
syntaxTree: null,
constantValueOpt: constantOne,
type: constantType);
LocalSymbol tempSymbol = new TempLocalSymbol(operandType, RefKind.None, containingSymbol);
BoundExpression boundTemp = new BoundLocal(
syntax: null,
syntaxTree: null,
localSymbol: tempSymbol,
constantValueOpt: null,
type: operandType);
// NOTE: the LHS may have a narrower type than the operator expects, but that
// doesn't seem to cause any problems. If a problem does arise, just add an
// explicit BoundConversion.
BoundExpression newValue = new BoundBinaryOperator(
syntax: null,
syntaxTree: null,
operatorKind: binaryOperatorKind,
left: isPrefix ? operand : boundTemp,
right: boundOne,
constantValueOpt: null,
type: constantType);
if (constantType != operandType)
{
newValue = new BoundConversion(
syntax: null,
syntaxTree: null,
operand: newValue,
conversionKind: operandType.IsEnumType() ? ConversionKind.ImplicitEnumeration : ConversionKind.ImplicitNumeric,
symbolOpt: null,
@checked: false,
explicitCastInCode: false,
constantValueOpt: null,
type: operandType);
}
ReadOnlyArray<BoundExpression> assignments = ReadOnlyArray<BoundExpression>.CreateFrom(
new BoundAssignmentOperator(
syntax: null,
syntaxTree: null,
left: boundTemp,
right: isPrefix ? newValue : operand,
type: operandType),
new BoundAssignmentOperator(
syntax: null,
syntaxTree: null,
left: operand,
right: isPrefix ? boundTemp : newValue,
type: operandType));
return new BoundSequence(
syntax: node.Syntax,
syntaxTree: node.SyntaxTree,
locals: ReadOnlyArray<LocalSymbol>.CreateFrom(tempSymbol),
sideEffects: assignments,
value: boundTemp,
type: operandType);
}
public override BoundNode VisitLocal(BoundLocal node)
{
if (node.LocalSymbol == _local)
{
_found = true;
}
return null;
}
internal override BoundBlock CreateBody(BindingDiagnosticBag 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),
argumentNamesOpt: default(ImmutableArray <string>),
argumentRefKindsOpt: default(ImmutableArray <RefKind>),
expanded: false,
argsToParamsOpt: default(ImmutableArray <int>),
defaultArguments: default(BitVector),
constantValueOpt: null,
initializerExpressionOpt: null,
type: _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,
@checked: false)
{
WasCompilerGenerated = true
};
return(new BoundBlock(syntax,
ImmutableArray.Create <LocalSymbol>(submissionLocal.LocalSymbol),
ImmutableArray.Create <BoundStatement>(submissionAssignment, returnStatement))
{
WasCompilerGenerated = true
});
}
internal override void GenerateMethodBody(TypeCompilationState compilationState, DiagnosticBag diagnostics)
{
AnonymousTypeManager manager = ((AnonymousTypeTemplateSymbol)this.ContainingType).Manager;
SyntheticBoundNodeFactory F = this.CreateBoundNodeFactory(compilationState, diagnostics);
// Method body:
//
// {
// $anonymous$ local = value as $anonymous$;
// return local != null
// && System.Collections.Generic.EqualityComparer<T_1>.Default.Equals(this.backingFld_1, local.backingFld_1)
// ...
// && System.Collections.Generic.EqualityComparer<T_N>.Default.Equals(this.backingFld_N, local.backingFld_N);
// }
// Type and type expression
AnonymousTypeTemplateSymbol anonymousType = (AnonymousTypeTemplateSymbol)this.ContainingType;
// local
BoundAssignmentOperator assignmentToTemp;
BoundLocal boundLocal = F.StoreToTemp(F.As(F.Parameter(_parameters[0]), anonymousType), out assignmentToTemp);
// Generate: statement <= 'local = value as $anonymous$'
BoundStatement assignment = F.ExpressionStatement(assignmentToTemp);
// Generate expression for return statement
// retExpression <= 'local != null'
BoundExpression retExpression = F.Binary(BinaryOperatorKind.ObjectNotEqual,
manager.System_Boolean,
F.Convert(manager.System_Object, boundLocal),
F.Null(manager.System_Object));
// prepare symbols
MethodSymbol equalityComparer_Equals = manager.System_Collections_Generic_EqualityComparer_T__Equals;
MethodSymbol equalityComparer_get_Default = manager.System_Collections_Generic_EqualityComparer_T__get_Default;
NamedTypeSymbol equalityComparerType = equalityComparer_Equals.ContainingType;
// Compare fields
for (int index = 0; index < anonymousType.Properties.Length; index++)
{
// Prepare constructed symbols
TypeParameterSymbol typeParameter = anonymousType.TypeParameters[index];
FieldSymbol fieldSymbol = anonymousType.Properties[index].BackingField;
NamedTypeSymbol constructedEqualityComparer = equalityComparerType.Construct(typeParameter);
// Generate 'retExpression' = 'retExpression && System.Collections.Generic.EqualityComparer<T_index>.
// Default.Equals(this.backingFld_index, local.backingFld_index)'
retExpression = F.LogicalAnd(retExpression,
F.Call(F.StaticCall(constructedEqualityComparer,
equalityComparer_get_Default.AsMember(constructedEqualityComparer)),
equalityComparer_Equals.AsMember(constructedEqualityComparer),
F.Field(F.This(), fieldSymbol),
F.Field(boundLocal, fieldSymbol)));
}
// Final return statement
BoundStatement retStatement = F.Return(retExpression);
// Create a bound block
F.CloseMethod(F.Block(ImmutableArray.Create <LocalSymbol>(boundLocal.LocalSymbol), assignment, retStatement));
}
internal IVariableDeclaratorOperation CreateVariableDeclarator(BoundLocal boundLocal)
{
return(boundLocal == null ? null : new VariableDeclaratorOperation(boundLocal.LocalSymbol.GetPublicSymbol(), initializer: null, ignoredArguments: ImmutableArray <IOperation> .Empty, semanticModel: _semanticModel, syntax: boundLocal.Syntax, type: null, constantValue: null, isImplicit: false));
}
public override BoundNode VisitLocal(BoundLocal node)
{
AddIfCaptured(node.LocalSymbol, node.Syntax);
return(base.VisitLocal(node));
}
static BoundStatement makeAppendString(SyntheticBoundNodeFactory F, BoundLocal builder, string value)
{
return(F.ExpressionStatement(F.Call(receiver: builder, F.WellKnownMethod(WellKnownMember.System_Text_StringBuilder__AppendString), F.StringLiteral(value))));
}
// Generates:
//
// private static T {Factory}(InteractiveSession session)
// {
// T submissionResult;
// new {ThisScriptClass}(session, out submissionResult);
// return submissionResult;
// }
private BoundBlock CreateSubmissionFactoryBody()
{
Debug.Assert(_containingType.TypeKind == TypeKind.Submission);
SyntaxTree syntaxTree = CSharpSyntaxTree.Dummy;
CSharpSyntaxNode syntax = (CSharpSyntaxNode)syntaxTree.GetRoot();
var interactiveSessionParam = new BoundParameter(syntax, _parameters[0])
{
WasCompilerGenerated = true
};
var ctor = _containingType.InstanceConstructors.Single();
Debug.Assert(ctor is SynthesizedInstanceConstructor);
Debug.Assert(ctor.ParameterCount == 2);
var submissionResultType = ctor.Parameters[1].Type;
var resultLocal = new SynthesizedLocal(ctor, submissionResultType, SynthesizedLocalKind.LoweringTemp);
var localReference = new BoundLocal(syntax, resultLocal, null, submissionResultType)
{
WasCompilerGenerated = true
};
BoundExpression submissionResult = localReference;
if (submissionResultType.IsStructType() && _returnType.SpecialType == SpecialType.System_Object)
{
submissionResult = new BoundConversion(syntax, submissionResult, Conversion.Boxing, false, true, ConstantValue.NotAvailable, _returnType)
{
WasCompilerGenerated = true
};
}
return(new BoundBlock(syntax,
// T submissionResult;
ImmutableArray.Create <LocalSymbol>(resultLocal),
ImmutableArray.Create <BoundStatement>(
// new Submission(interactiveSession, out submissionResult);
new BoundExpressionStatement(syntax,
new BoundObjectCreationExpression(
syntax,
ctor,
ImmutableArray.Create <BoundExpression>(interactiveSessionParam, localReference),
ImmutableArray <string> .Empty,
ImmutableArray.Create <RefKind>(RefKind.None, RefKind.Ref),
false,
default(ImmutableArray <int>),
null,
null,
_containingType
)
{
WasCompilerGenerated = true
})
{
WasCompilerGenerated = true
},
// return submissionResult;
new BoundReturnStatement(syntax, submissionResult)
{
WasCompilerGenerated = true
}))
{
WasCompilerGenerated = true
});
}
public sealed override BoundNode VisitLocal(BoundLocal node)
{
BoundNode replacement;
if (TryReplaceWithProxy(node.LocalSymbol, node.Syntax, out replacement))
{
return replacement;
}
// if a local needs a proxy it should have been allocated by its declaration node.
Debug.Assert(!NeedsProxy(node.LocalSymbol));
return VisitUnhoistedLocal(node);
}
/// <summary>
/// Gets already declared and initialized local.
/// </summary>
private LocalDefinition GetLocal(BoundLocal localExpression)
{
var symbol = localExpression.LocalSymbol;
return GetLocal(symbol);
}
public override BoundNode VisitAssignmentOperator(BoundAssignmentOperator node)
{
BoundExpression originalLeft = node.Left;
if (originalLeft.Kind != BoundKind.Local)
{
return(base.VisitAssignmentOperator(node));
}
var leftLocal = (BoundLocal)originalLeft;
BoundExpression originalRight = node.Right;
if (leftLocal.LocalSymbol.RefKind != RefKind.None &&
node.IsRef &&
NeedsProxy(leftLocal.LocalSymbol))
{
Debug.Assert(!proxies.ContainsKey(leftLocal.LocalSymbol));
Debug.Assert(originalRight.Kind != BoundKind.ConvertedStackAllocExpression);
//spilling ref local variables
throw ExceptionUtilities.Unreachable;
}
if (NeedsProxy(leftLocal.LocalSymbol) && !proxies.ContainsKey(leftLocal.LocalSymbol))
{
Debug.Assert(leftLocal.LocalSymbol.DeclarationKind == LocalDeclarationKind.None);
// spilling temp variables
throw ExceptionUtilities.Unreachable;
}
BoundExpression rewrittenLeft = (BoundExpression)this.Visit(leftLocal);
BoundExpression rewrittenRight = (BoundExpression)this.Visit(originalRight);
TypeSymbol rewrittenType = VisitType(node.Type);
// Check if we're assigning the result of stackalloc to a hoisted local.
// If we are, we need to store the result in a temp local and then assign
// the value of the local to the field corresponding to the hoisted local.
// If the receiver of the field is on the stack when the stackalloc happens,
// popping it will free the memory (?) or otherwise cause verification issues.
// DevDiv Bugs 59454
if (rewrittenLeft.Kind != BoundKind.Local && originalRight.Kind == BoundKind.ConvertedStackAllocExpression)
{
// From ILGENREC::genAssign:
// DevDiv Bugs 59454: Handle hoisted local initialized with a stackalloc
// NOTE: Need to check for cast of stackalloc on RHS.
// If LHS isLocal, then genAddr is a noop so regular case works fine.
SyntheticBoundNodeFactory factory = new SyntheticBoundNodeFactory(this.CurrentMethod, rewrittenLeft.Syntax, this.CompilationState, this.Diagnostics);
BoundAssignmentOperator tempAssignment;
BoundLocal tempLocal = factory.StoreToTemp(rewrittenRight, out tempAssignment);
Debug.Assert(!node.IsRef);
BoundAssignmentOperator rewrittenAssignment = node.Update(rewrittenLeft, tempLocal, node.IsRef, rewrittenType);
return(new BoundSequence(
node.Syntax,
ImmutableArray.Create <LocalSymbol>(tempLocal.LocalSymbol),
ImmutableArray.Create <BoundExpression>(tempAssignment),
rewrittenAssignment,
rewrittenType));
}
return(node.Update(rewrittenLeft, rewrittenRight, node.IsRef, rewrittenType));
}
public override BoundNode VisitAssignmentOperator(BoundAssignmentOperator node)
{
var sequence = node.Left as BoundSequence;
if (sequence != null)
{
// assigning to a sequence is uncommon, but could happen in a
// case if LHS was a declaration expression.
//
// Just rewrite {se1, se2, se3, val} = something
// into ==> {se1, se2, se3, val = something}
BoundExpression rewritten = sequence.Update(sequence.Locals,
sequence.SideEffects,
node.Update(sequence.Value, node.Right, node.RefKind, node.Type),
sequence.Type);
rewritten = (BoundExpression)Visit(rewritten);
// do not count the assignment twice
_counter--;
return rewritten;
}
var isIndirectAssignment = IsIndirectAssignment(node);
var left = VisitExpression(node.Left, isIndirectAssignment ?
ExprContext.Address :
ExprContext.AssignmentTarget);
// must delay recording a write until after RHS is evaluated
var assignmentLocal = _assignmentLocal;
_assignmentLocal = null;
Debug.Assert(_context != ExprContext.AssignmentTarget, "assignment expression cannot be a target of another assignment");
ExprContext rhsContext;
if (node.RefKind != RefKind.None ||
_context == ExprContext.Address)
{
// we need the address of rhs one way or another so we cannot have it on the stack.
rhsContext = ExprContext.Address;
}
else
{
Debug.Assert(_context == ExprContext.Value ||
_context == ExprContext.Box ||
_context == ExprContext.Sideeffects, "assignment expression cannot be a target of another assignment");
// we only need a value of rhs, so if otherwise possible it can be a stack value.
rhsContext = ExprContext.Value;
}
// if right is a struct ctor, it may be optimized into in-place call
// Such call will push the receiver ref before the arguments
// so we need to ensure that arguments cannot use stack temps
BoundExpression right = node.Right;
object rhsCookie = null;
if (right.Kind == BoundKind.ObjectCreationExpression &&
right.Type.IsVerifierValue() &&
((BoundObjectCreationExpression)right).Constructor.ParameterCount != 0)
{
rhsCookie = this.GetStackStateCookie();
}
right = VisitExpression(node.Right, rhsContext);
// if assigning to a local, now it is the time to record the Write
if (assignmentLocal != null)
{
// This assert will fire if code relies on implicit CLR coercions
// - i.e assigns int value to a short local.
// in that case we should force lhs to be a real local.
Debug.Assert(
node.Left.Type.Equals(node.Right.Type, ignoreCustomModifiersAndArraySizesAndLowerBounds: true, ignoreDynamic: true),
@"type of the assignment value is not the same as the type of assignment target.
This is not expected by the optimizer and is typically a result of a bug somewhere else.");
Debug.Assert(!isIndirectAssignment, "indirect assignment is a read, not a write");
LocalSymbol localSymbol = assignmentLocal.LocalSymbol;
// Special Case: If the RHS is a pointer conversion, then the assignment functions as
// a conversion (because the RHS will actually be typed as a native u/int in IL), so
// we should not optimize away the local (i.e. schedule it on the stack).
if (CanScheduleToStack(localSymbol) &&
assignmentLocal.Type.IsPointerType() && right.Kind == BoundKind.Conversion &&
((BoundConversion)right).ConversionKind.IsPointerConversion())
{
ShouldNotSchedule(localSymbol);
}
RecordVarWrite(localSymbol);
assignmentLocal = null;
}
if (rhsCookie != null)
{
// we currently have the rhs on stack, adjust for that.
PopEvalStack();
this.EnsureStackState(rhsCookie);
}
return node.Update(left, right, node.RefKind, node.Type);
}
// private static void <Main>()
// {
// var script = new Script();
// script.<Initialize>().GetAwaiter().GetResult();
// }
internal override BoundBlock CreateBody()
{
// CreateBody should only be called if no errors.
Debug.Assert((object)_getAwaiterMethod != null);
Debug.Assert((object)_getResultMethod != null);
var syntax = this.GetSyntax();
var ctor = _containingType.GetScriptConstructor();
Debug.Assert(ctor.ParameterCount == 0);
var initializer = _containingType.GetScriptInitializer();
Debug.Assert(initializer.ParameterCount == 0);
var scriptLocal = new BoundLocal(
syntax,
new SynthesizedLocal(this, _containingType, SynthesizedLocalKind.LoweringTemp),
null,
_containingType)
{
WasCompilerGenerated = true
};
return(new BoundBlock(syntax,
ImmutableArray.Create <LocalSymbol>(scriptLocal.LocalSymbol),
ImmutableArray <LocalFunctionSymbol> .Empty,
ImmutableArray.Create <BoundStatement>(
// var script = new Script();
new BoundExpressionStatement(
syntax,
new BoundAssignmentOperator(
syntax,
scriptLocal,
new BoundObjectCreationExpression(
syntax,
ctor)
{
WasCompilerGenerated = true
},
_containingType)
{
WasCompilerGenerated = true
})
{
WasCompilerGenerated = true
},
// script.<Initialize>().GetAwaiter().GetResult();
new BoundExpressionStatement(
syntax,
CreateParameterlessCall(
syntax,
CreateParameterlessCall(
syntax,
CreateParameterlessCall(
syntax,
scriptLocal,
initializer),
_getAwaiterMethod),
_getResultMethod))
{
WasCompilerGenerated = true
},
// return;
new BoundReturnStatement(
syntax,
RefKind.None,
null)
{
WasCompilerGenerated = true
}))
{
WasCompilerGenerated = true
});
}
// Used to increment integer index into an array or string.
private static BoundExpressionStatement MakePositionIncrement(SyntaxNode syntax, BoundLocal boundPositionVar, TypeSymbol intType)
{
return new BoundExpressionStatement(syntax,
expression: new BoundAssignmentOperator(syntax,
left: boundPositionVar,
right: new BoundBinaryOperator(syntax,
operatorKind: BinaryOperatorKind.IntAddition, // unchecked, never overflows since array/string index can't be >= Int32.MaxValue
left: boundPositionVar,
right: new BoundLiteral(syntax,
constantValueOpt: ConstantValue.ConstantValueOne.Int32,
type: intType),
constantValueOpt: null,
methodOpt: null,
resultKind: LookupResultKind.Viable,
type: intType),
type: intType));
}
// private static void <Main>()
// {
// var script = new Script();
// script.<Initialize>().GetAwaiter().GetResult();
// }
internal override BoundBlock CreateBody(DiagnosticBag diagnostics)
{
var syntax = DummySyntax();
var compilation = _containingType.DeclaringCompilation;
// Creates a new top-level binder that just contains the global imports for the compilation.
// The imports are required if a consumer of the scripting API is using a Task implementation
// that uses extension methods.
var binder = new InContainerBinder(
container: null,
next: new BuckStopsHereBinder(compilation),
imports: compilation.GlobalImports);
binder = new InContainerBinder(compilation.GlobalNamespace, binder);
var ctor = _containingType.GetScriptConstructor();
Debug.Assert(ctor.ParameterCount == 0);
var initializer = _containingType.GetScriptInitializer();
Debug.Assert(initializer.ParameterCount == 0);
var scriptLocal = new BoundLocal(
syntax,
new SynthesizedLocal(this, _containingType, SynthesizedLocalKind.LoweringTemp),
null,
_containingType)
{
WasCompilerGenerated = true
};
var initializeCall = CreateParameterlessCall(syntax, scriptLocal, initializer);
BoundExpression getAwaiterGetResultCall;
if (!binder.GetAwaitableExpressionInfo(initializeCall, out _, out _, out _, out getAwaiterGetResultCall, syntax, diagnostics))
{
return(new BoundBlock(
syntax: syntax,
locals: ImmutableArray <LocalSymbol> .Empty,
statements: ImmutableArray <BoundStatement> .Empty,
hasErrors: true));
}
return(new BoundBlock(syntax,
ImmutableArray.Create <LocalSymbol>(scriptLocal.LocalSymbol),
ImmutableArray.Create <BoundStatement>(
// var script = new Script();
new BoundExpressionStatement(
syntax,
new BoundAssignmentOperator(
syntax,
scriptLocal,
new BoundObjectCreationExpression(
syntax,
ctor,
null)
{
WasCompilerGenerated = true
},
_containingType)
{
WasCompilerGenerated = true
})
{
WasCompilerGenerated = true
},
// script.<Initialize>().GetAwaiter().GetResult();
new BoundExpressionStatement(syntax, getAwaiterGetResultCall)
{
WasCompilerGenerated = true
},
// return;
new BoundReturnStatement(
syntax,
RefKind.None,
null)
{
WasCompilerGenerated = true
}))
{
WasCompilerGenerated = true
});
}
public override BoundNode VisitLocal(BoundLocal node)
{
var result = RewriteLocal(node);
Debug.Assert(result.Type == node.Type);
return result;
}
// 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, _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(initializeResult.Type == _returnType);
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 void <Main>()
// {
// var script = new Script();
// script.<Initialize>().GetAwaiter().GetResult();
// }
internal override BoundBlock CreateBody()
{
// CreateBody should only be called if no errors.
Debug.Assert((object)_getAwaiterMethod != null);
Debug.Assert((object)_getResultMethod != null);
var syntax = this.GetSyntax();
var ctor = _containingType.GetScriptConstructor();
Debug.Assert(ctor.ParameterCount == 0);
var initializer = _containingType.GetScriptInitializer();
Debug.Assert(initializer.ParameterCount == 0);
var scriptLocal = new BoundLocal(
syntax,
new SynthesizedLocal(this, _containingType, SynthesizedLocalKind.LoweringTemp),
null,
_containingType)
{ WasCompilerGenerated = true };
return new BoundBlock(syntax,
ImmutableArray.Create<LocalSymbol>(scriptLocal.LocalSymbol),
ImmutableArray<LocalFunctionSymbol>.Empty,
ImmutableArray.Create<BoundStatement>(
// var script = new Script();
new BoundExpressionStatement(
syntax,
new BoundAssignmentOperator(
syntax,
scriptLocal,
new BoundObjectCreationExpression(
syntax,
ctor)
{ WasCompilerGenerated = true },
_containingType)
{ WasCompilerGenerated = true })
{ WasCompilerGenerated = true },
// script.<Initialize>().GetAwaiter().GetResult();
new BoundExpressionStatement(
syntax,
CreateParameterlessCall(
syntax,
CreateParameterlessCall(
syntax,
CreateParameterlessCall(
syntax,
scriptLocal,
initializer),
_getAwaiterMethod),
_getResultMethod))
{ WasCompilerGenerated = true },
// return;
new BoundReturnStatement(
syntax,
RefKind.None,
null)
{ WasCompilerGenerated = true }))
{ WasCompilerGenerated = true };
}
private BoundExpression VisitAssignmentOperator(BoundAssignmentOperator node, bool used)
{
// Avoid rewriting if node has errors since at least
// one of the operands is invalid.
if (node.HasErrors)
{
return node;
}
var propertyAccessor = node.Left as BoundPropertyAccess;
if (propertyAccessor == null)
{
return (BoundExpression)base.VisitAssignmentOperator(node);
}
// Rewrite property assignment into call to setter.
var property = propertyAccessor.PropertySymbol.GetBaseProperty();
var setMethod = property.SetMethod;
Debug.Assert(setMethod != null);
Debug.Assert(setMethod.Parameters.Count == 1);
Debug.Assert(!setMethod.IsOverride);
var rewrittenReceiver = (BoundExpression)Visit(propertyAccessor.ReceiverOpt);
var rewrittenArgument = (BoundExpression)Visit(node.Right);
if (used)
{
// Save expression value to a temporary before calling the
// setter, and restore the temporary after the setter, so the
// assignment can be used as an embedded expression.
var exprType = rewrittenArgument.Type;
var tempSymbol = new TempLocalSymbol(exprType, RefKind.None, containingSymbol);
var tempLocal = new BoundLocal(null, null, tempSymbol, null, exprType);
var saveTemp = new BoundAssignmentOperator(
null,
null,
tempLocal,
rewrittenArgument,
exprType);
var call = BoundCall.SynthesizedCall(
rewrittenReceiver,
setMethod,
saveTemp);
return new BoundSequence(
node.Syntax,
node.SyntaxTree,
ReadOnlyArray<LocalSymbol>.CreateFrom(tempSymbol),
ReadOnlyArray<BoundExpression>.CreateFrom(call),
tempLocal,
exprType);
}
else
{
return BoundCall.SynthesizedCall(
rewrittenReceiver,
setMethod,
rewrittenArgument);
}
}
private EEMethodSymbol GetPseudoVariableMethod(
TypeNameDecoder<PEModuleSymbol, TypeSymbol> typeNameDecoder,
EENamedTypeSymbol container,
string methodName,
Alias alias)
{
var syntax = SyntaxFactory.IdentifierName(SyntaxFactory.MissingToken(SyntaxKind.IdentifierToken));
return this.CreateMethod(container, methodName, syntax, (method, diagnostics) =>
{
var local = PlaceholderLocalBinder.CreatePlaceholderLocal(typeNameDecoder, method, alias);
var expression = new BoundLocal(syntax, local, constantValueOpt: null, type: local.Type);
return new BoundReturnStatement(syntax, expression) { WasCompilerGenerated = true };
});
}
// Generates:
//
// private static T {Factory}(InteractiveSession session)
// {
// T submissionResult;
// new {ThisScriptClass}(session, out submissionResult);
// return submissionResult;
// }
private BoundBlock CreateSubmissionFactoryBody()
{
Debug.Assert(_containingType.TypeKind == TypeKind.Submission);
SyntaxTree syntaxTree = CSharpSyntaxTree.Dummy;
CSharpSyntaxNode syntax = (CSharpSyntaxNode)syntaxTree.GetRoot();
var interactiveSessionParam = new BoundParameter(syntax, _parameters[0]) { WasCompilerGenerated = true };
var ctor = _containingType.InstanceConstructors.Single();
Debug.Assert(ctor is SynthesizedInstanceConstructor);
Debug.Assert(ctor.ParameterCount == 2);
var submissionResultType = ctor.Parameters[1].Type;
var resultLocal = new SynthesizedLocal(ctor, submissionResultType, SynthesizedLocalKind.LoweringTemp);
var localReference = new BoundLocal(syntax, resultLocal, null, submissionResultType) { WasCompilerGenerated = true };
BoundExpression submissionResult = localReference;
if (submissionResultType.IsStructType() && _returnType.SpecialType == SpecialType.System_Object)
{
submissionResult = new BoundConversion(syntax, submissionResult, Conversion.Boxing, false, true, ConstantValue.NotAvailable, _returnType)
{ WasCompilerGenerated = true };
}
return new BoundBlock(syntax,
// T submissionResult;
ImmutableArray.Create<LocalSymbol>(resultLocal),
ImmutableArray.Create<BoundStatement>(
// new Submission(interactiveSession, out submissionResult);
new BoundExpressionStatement(syntax,
new BoundObjectCreationExpression(
syntax,
ctor,
ImmutableArray.Create<BoundExpression>(interactiveSessionParam, localReference),
ImmutableArray<string>.Empty,
ImmutableArray.Create<RefKind>(RefKind.None, RefKind.Ref),
false,
default(ImmutableArray<int>),
null,
null,
_containingType
)
{ WasCompilerGenerated = true })
{ WasCompilerGenerated = true },
// return submissionResult;
new BoundReturnStatement(syntax, submissionResult) { WasCompilerGenerated = true }))
{ WasCompilerGenerated = true };
}
private EEMethodSymbol GetLocalMethod(EENamedTypeSymbol container, string methodName, string localName, int localIndex)
{
var syntax = SyntaxFactory.IdentifierName(localName);
return this.CreateMethod(container, methodName, syntax, (method, diagnostics) =>
{
var local = method.LocalsForBinding[localIndex];
var expression = new BoundLocal(syntax, local, constantValueOpt: local.GetConstantValue(null, null, diagnostics), type: local.Type);
return new BoundReturnStatement(syntax, expression) { WasCompilerGenerated = true };
});
}
public override BoundNode VisitLocal(BoundLocal node)
{
if (node.ConstantValueOpt == null)
{
switch (this.context)
{
case ExprContext.Address:
if (node.LocalSymbol.RefKind != RefKind.None)
{
RecordVarRead(node.LocalSymbol);
}
else
{
RecordVarRef(node.LocalSymbol);
}
break;
case ExprContext.AssignmentTarget:
Debug.Assert(assignmentLocal == null);
// actual assignment will happen later, after Right is evaluated
// just remember what we are assigning to.
assignmentLocal = node;
// whatever is available as lastExpression is still available
// (adjust for visit of this node)
this.lastExpressionCnt++;
break;
case ExprContext.Sideeffects:
break;
case ExprContext.Value:
case ExprContext.Box:
RecordVarRead(node.LocalSymbol);
break;
}
}
return base.VisitLocal(node);
}
public override BoundNode VisitCatchBlock(BoundCatchBlock node)
{
EnsureOnlyEvalStack();
var exceptionSourceOpt = node.ExceptionSourceOpt;
DeclareLocals(node.Locals, stack: 0);
if (exceptionSourceOpt != null)
{
// runtime pushes the exception object
PushEvalStack(null, ExprContext.None);
_counter++;
// We consume it by writing into the exception source.
if (exceptionSourceOpt.Kind == BoundKind.Local)
{
RecordVarWrite(((BoundLocal)exceptionSourceOpt).LocalSymbol);
}
else
{
int prevStack = StackDepth();
exceptionSourceOpt = VisitExpression(exceptionSourceOpt, ExprContext.AssignmentTarget);
_assignmentLocal = null; // not using this for exceptionSource
SetStackDepth(prevStack);
}
PopEvalStack();
_counter++;
}
BoundExpression boundFilter;
if (node.ExceptionFilterOpt != null)
{
boundFilter = (BoundExpression)this.Visit(node.ExceptionFilterOpt);
// the value of filter expression is consumed by the VM
PopEvalStack();
_counter++;
// variables allocated on stack in a filter can't be used in the catch handler
EnsureOnlyEvalStack();
}
else
{
boundFilter = null;
}
var boundBlock = (BoundBlock)this.Visit(node.Body);
var exceptionTypeOpt = this.VisitType(node.ExceptionTypeOpt);
return node.Update(node.Locals, exceptionSourceOpt, exceptionTypeOpt, boundFilter, boundBlock, node.IsSynthesizedAsyncCatchAll);
}
// Generates:
//
// private static T {Factory}(InteractiveSession session)
// {
// T submissionResult;
// new {ThisScriptClass}(session, out submissionResult);
// return submissionResult;
// }
private BoundBlock CreateSubmissionFactoryBody()
{
Debug.Assert(containingType.TypeKind == TypeKind.Submission);
SyntaxTree syntaxTree = CSharpSyntaxTree.Dummy;
CSharpSyntaxNode syntax = (CSharpSyntaxNode)syntaxTree.GetRoot();
var interactiveSessionParam = new BoundParameter(syntax, parameters[0]) { WasCompilerGenerated = true };
var ctor = containingType.InstanceConstructors.Single();
Debug.Assert(ctor is SynthesizedInstanceConstructor);
Debug.Assert(ctor.ParameterCount == 2);
var submissionResultType = ctor.Parameters[1].Type;
var submissionResult = new BoundLocal(syntax, new SynthesizedLocal(ctor, submissionResultType), null, submissionResultType) { WasCompilerGenerated = true };
return new BoundBlock(syntax,
// T submissionResult;
ImmutableArray.Create<LocalSymbol>(submissionResult.LocalSymbol),
ImmutableArray.Create<BoundStatement>(
// new Submission(interactiveSession, out submissionResult);
new BoundExpressionStatement(syntax,
new BoundObjectCreationExpression(
syntax,
ctor,
ImmutableArray.Create<BoundExpression>(interactiveSessionParam, submissionResult),
ImmutableArray<string>.Empty,
ImmutableArray.Create<RefKind>(RefKind.None, RefKind.Ref),
false,
default(ImmutableArray<int>),
null,
null,
containingType
)
{ WasCompilerGenerated = true })
{ WasCompilerGenerated = true },
// return submissionResult;
new BoundReturnStatement(syntax, submissionResult) { WasCompilerGenerated = true }))
{ WasCompilerGenerated = true };
}
private BoundNode VisitUnhoistedLocal(BoundLocal node)
{
LocalSymbol replacementLocal;
if (this.localMap.TryGetValue(node.LocalSymbol, out replacementLocal))
{
return new BoundLocal(node.Syntax, replacementLocal, node.ConstantValueOpt, replacementLocal.Type, node.HasErrors);
}
return base.VisitLocal(node);
}
// private static void <Main>()
// {
// var script = new Script();
// script.<Initialize>();
// }
internal override BoundBlock CreateBody()
{
var syntax = this.GetSyntax();
var ctor = _containingType.GetScriptConstructor();
Debug.Assert(ctor.ParameterCount == 0);
var initializer = _containingType.GetScriptInitializer();
Debug.Assert(initializer.ParameterCount == 0);
var submissionLocal = new BoundLocal(
syntax,
new SynthesizedLocal(this, _containingType, SynthesizedLocalKind.LoweringTemp),
null,
_containingType)
{ WasCompilerGenerated = true };
return new BoundBlock(syntax,
ImmutableArray.Create<LocalSymbol>(submissionLocal.LocalSymbol),
ImmutableArray.Create<BoundStatement>(
// var script = new Script();
new BoundExpressionStatement(
syntax,
new BoundAssignmentOperator(
syntax,
submissionLocal,
new BoundObjectCreationExpression(
syntax,
ctor)
{ WasCompilerGenerated = true },
_containingType)
{ WasCompilerGenerated = true })
{ WasCompilerGenerated = true },
// script.<Initialize>();
new BoundExpressionStatement(
syntax,
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 })
{ WasCompilerGenerated = true },
// return;
new BoundReturnStatement(
syntax,
null)
{ WasCompilerGenerated = true }))
{ WasCompilerGenerated = true };
}
public override BoundNode VisitLocal(BoundLocal node)
{
LocalDefUseInfo locInfo;
if (!_info.TryGetValue(node.LocalSymbol, out locInfo))
{
return base.VisitLocal(node);
}
// not the last access, emit Dup.
if (!IsLastAccess(locInfo, _nodeCounter))
{
return new BoundDup(node.Syntax, node.LocalSymbol.RefKind, node.Type);
}
// last access - leave the node as is. Emit will do nothing expecting the node on the stack
return base.VisitLocal(node);
}
// 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 VisitLocal(BoundLocal node)
{
if (node.ConstantValueOpt == null)
{
switch (_context)
{
case ExprContext.Address:
if (node.LocalSymbol.RefKind != RefKind.None)
{
RecordVarRead(node.LocalSymbol);
}
else
{
RecordVarRef(node.LocalSymbol);
}
break;
case ExprContext.AssignmentTarget:
Debug.Assert(_assignmentLocal == null);
// actual assignment will happen later, after Right is evaluated
// just remember what we are assigning to.
_assignmentLocal = node;
break;
case ExprContext.Sideeffects:
break;
case ExprContext.Value:
case ExprContext.Box:
RecordVarRead(node.LocalSymbol);
break;
}
}
return base.VisitLocal(node);
}
private BoundStatement RewriteMultiDimensionalArrayForEachStatement(BoundForEachStatement node)
{
ForEachStatementSyntax forEachSyntax = (ForEachStatementSyntax)node.Syntax;
BoundExpression collectionExpression = GetUnconvertedCollectionExpression(node);
Debug.Assert(collectionExpression.Type.IsArray());
ArrayTypeSymbol arrayType = (ArrayTypeSymbol)collectionExpression.Type;
int rank = arrayType.Rank;
Debug.Assert(rank > 1);
TypeSymbol intType = compilation.GetSpecialType(SpecialType.System_Int32);
TypeSymbol boolType = compilation.GetSpecialType(SpecialType.System_Boolean);
BoundExpression rewrittenExpression = (BoundExpression)Visit(collectionExpression);
BoundStatement rewrittenBody = (BoundStatement)Visit(node.Body);
// A[...] a
LocalSymbol arrayVar = new TempLocalSymbol(arrayType, RefKind.None, containingMethod);
// A[...] a = /*node.Expression*/;
BoundStatement arrayVarDecl = MakeLocalDeclaration(forEachSyntax, arrayVar, rewrittenExpression);
AddForEachExpressionSequencePoint(forEachSyntax, ref arrayVarDecl);
// Reference to a.
BoundLocal boundArrayVar = MakeBoundLocal(forEachSyntax, arrayVar, arrayType);
// int p_0, p_1, ...
LocalSymbol[] positionVar = new LocalSymbol[rank];
BoundLocal[] boundPositionVar = new BoundLocal[rank];
for (int dimension = 0; dimension < rank; dimension++)
{
positionVar[dimension] = new TempLocalSymbol(intType, RefKind.None, containingMethod);
boundPositionVar[dimension] = MakeBoundLocal(forEachSyntax, positionVar[dimension], intType);
}
// V v
LocalSymbol iterationVar = node.IterationVariable;
TypeSymbol iterationVarType = iterationVar.Type;
// (V)a[p_0, p_1, ...]
BoundExpression iterationVarInitValue = SynthesizeConversion(
syntax: forEachSyntax,
operand: new BoundArrayAccess(forEachSyntax,
expression: boundArrayVar,
indices: ReadOnlyArray<BoundExpression>.CreateFrom((BoundExpression[])boundPositionVar),
type: arrayType.ElementType),
conversion: node.ElementConversion,
type: iterationVarType);
// V v = (V)a[p_0, p_1, ...];
BoundStatement iterationVarDecl = MakeLocalDeclaration(forEachSyntax, iterationVar, iterationVarInitValue);
AddForEachIterationVariableSequencePoint(forEachSyntax, ref iterationVarDecl);
// { V v = (V)a[p_0, p_1, ...]; /* node.Body */ }
BoundStatement innermostLoopBody = new BoundBlock(forEachSyntax,
localsOpt: ReadOnlyArray<LocalSymbol>.CreateFrom(iterationVar),
statements: ReadOnlyArray<BoundStatement>.CreateFrom(iterationVarDecl, rewrittenBody));
// Values we'll use every iteration
MethodSymbol getLowerBoundMethod = (MethodSymbol)this.compilation.GetSpecialTypeMember(SpecialMember.System_Array__GetLowerBound);
MethodSymbol getUpperBoundMethod = (MethodSymbol)this.compilation.GetSpecialTypeMember(SpecialMember.System_Array__GetUpperBound);
// work from most-nested to least-nested
// for (A[...] a = /*node.Expression*/; int p_0 = a.GetLowerBound(0); p_0 <= a.GetUpperBound(0); p_0 = p_0 + 1)
// for (int p_1 = a.GetLowerBound(0); p_1 <= a.GetUpperBound(0); p_1 = p_1 + 1)
// ...
// { V v = (V)a[p_0, p_1, ...]; /* node.Body */ }
BoundStatement forLoop = null;
for (int dimension = rank - 1; dimension >= 0; dimension--)
{
ReadOnlyArray<BoundExpression> dimensionArgument = ReadOnlyArray<BoundExpression>.CreateFrom(
new BoundLiteral(forEachSyntax,
constantValueOpt: ConstantValue.Create(dimension, ConstantValueTypeDiscriminator.Int32),
type: intType));
// a.GetLowerBound(/*dimension*/)
BoundExpression currentDimensionLowerBound = BoundCall.Synthesized(forEachSyntax, boundArrayVar, getLowerBoundMethod, dimensionArgument);
// a.GetUpperBound(/*dimension*/) //CONSIDER: dev10 creates a temp for each dimension's upper bound
BoundExpression currentDimensionUpperBound = BoundCall.Synthesized(forEachSyntax, boundArrayVar, getUpperBoundMethod, dimensionArgument);
// int p_/*dimension*/ = a.GetLowerBound(/*dimension*/);
BoundStatement positionVarDecl = MakeLocalDeclaration(forEachSyntax, positionVar[dimension], currentDimensionLowerBound);
ReadOnlyArray<LocalSymbol> locals;
BoundStatement initializer;
GeneratedLabelSymbol breakLabel;
if (dimension == 0)
{
// outermost for-loop
locals = ReadOnlyArray<LocalSymbol>.CreateFrom(arrayVar, positionVar[dimension]);
initializer = new BoundStatementList(forEachSyntax,
statements: ReadOnlyArray<BoundStatement>.CreateFrom(arrayVarDecl, positionVarDecl));
breakLabel = node.BreakLabel; // i.e. the one that break statements will jump to
}
else
{
locals = ReadOnlyArray<LocalSymbol>.CreateFrom(positionVar[dimension]);
initializer = positionVarDecl;
breakLabel = new GeneratedLabelSymbol("break"); // Should not affect emitted code since unused
}
// p_/*dimension*/ <= a.GetUpperBound(/*dimension*/) //NB: OrEqual
BoundExpression exitCondition = new BoundBinaryOperator(
syntax: forEachSyntax,
operatorKind: BinaryOperatorKind.IntLessThanOrEqual,
left: boundPositionVar[dimension],
right: currentDimensionUpperBound,
constantValueOpt: null,
methodOpt: null,
resultKind: LookupResultKind.Viable,
type: boolType);
// p_/*dimension*/ = p_/*dimension*/ + 1;
BoundStatement positionIncrement = MakePositionIncrement(forEachSyntax, boundPositionVar[dimension], intType);
BoundStatement body;
GeneratedLabelSymbol continueLabel;
if(forLoop == null)
{
// innermost for-loop
body = innermostLoopBody;
continueLabel = node.ContinueLabel; //i.e. the one continue statements will actually jump to
}
else
{
body = forLoop;
continueLabel = new GeneratedLabelSymbol("continue"); // Should not affect emitted code since unused
}
forLoop = RewriteForStatement(
node.Syntax,
locals,
initializer,
exitCondition,
forEachSyntax.InKeyword,
positionIncrement,
body,
breakLabel,
continueLabel,
node.HasErrors);
}
Debug.Assert(forLoop != null);
AddForEachExpressionSequencePoint(forEachSyntax, ref forLoop);
return forLoop;
}
private void EmitLocalLoad(BoundLocal local, bool used)
{
if (IsStackLocal(local.LocalSymbol))
{
// local must be already on the stack
EmitPopIfUnused(used);
}
else
{
if (used)
{
LocalDefinition definition = GetLocal(local);
_builder.EmitLocalLoad(definition);
}
else
{
// do nothing. Unused local load has no side-effects.
return;
}
}
if (used && local.LocalSymbol.RefKind != RefKind.None)
{
EmitLoadIndirect(local.LocalSymbol.Type, local.Syntax);
}
}
/// <summary>
/// The rewrites are as follows:
///
/// x++
/// temp = x
/// x = temp + 1
/// return temp
/// x--
/// temp = x
/// x = temp - 1
/// return temp
/// ++x
/// temp = x + 1
/// x = temp
/// return temp
/// --x
/// temp = x - 1
/// x = temp
/// return temp
///
/// In each case, the literal 1 is of the type required by the builtin addition/subtraction operator that
/// will be used. The temp is of the same type as x, but the sum/difference may be wider, in which case a
/// conversion is required.
/// </summary>
/// <param name="node">The unary operator expression representing the increment/decrement.</param>
/// <param name="isPrefix">True for prefix, false for postfix.</param>
/// <param name="isIncrement">True for increment, false for decrement.</param>
/// <returns>A bound sequence that uses a temp to acheive the correct side effects and return value.</returns>
private BoundNode LowerOperator(BoundUnaryOperator node, bool isPrefix, bool isIncrement)
{
BoundExpression operand = node.Operand;
TypeSymbol operandType = operand.Type; //type of the variable being incremented
Debug.Assert(operandType == node.Type);
ConstantValue constantOne;
BinaryOperatorKind binaryOperatorKind;
MakeConstantAndOperatorKind(node.OperatorKind.OperandTypes(), node, out constantOne, out binaryOperatorKind);
binaryOperatorKind |= isIncrement ? BinaryOperatorKind.Addition : BinaryOperatorKind.Subtraction;
Debug.Assert(constantOne != null);
Debug.Assert(constantOne.SpecialType != SpecialType.None);
Debug.Assert(binaryOperatorKind.OperandTypes() != 0);
TypeSymbol constantType = compilation.GetSpecialType(constantOne.SpecialType);
BoundExpression boundOne = new BoundLiteral(
syntax: null,
syntaxTree: null,
constantValueOpt: constantOne,
type: constantType);
LocalSymbol tempSymbol = new TempLocalSymbol(operandType, RefKind.None, containingSymbol);
BoundExpression boundTemp = new BoundLocal(
syntax: null,
syntaxTree: null,
localSymbol: tempSymbol,
constantValueOpt: null,
type: operandType);
// NOTE: the LHS may have a narrower type than the operator expects, but that
// doesn't seem to cause any problems. If a problem does arise, just add an
// explicit BoundConversion.
BoundExpression newValue = new BoundBinaryOperator(
syntax: null,
syntaxTree: null,
operatorKind: binaryOperatorKind,
left: isPrefix ? operand : boundTemp,
right: boundOne,
constantValueOpt: null,
type: constantType);
if (constantType != operandType)
{
newValue = new BoundConversion(
syntax: null,
syntaxTree: null,
operand: newValue,
conversionKind: operandType.IsEnumType() ? ConversionKind.ImplicitEnumeration : ConversionKind.ImplicitNumeric,
symbolOpt: null,
@checked: false,
explicitCastInCode: false,
constantValueOpt: null,
type: operandType);
}
ReadOnlyArray <BoundExpression> assignments = ReadOnlyArray <BoundExpression> .CreateFrom(
new BoundAssignmentOperator(
syntax : null,
syntaxTree : null,
left : boundTemp,
right : isPrefix ? newValue : operand,
type : operandType),
new BoundAssignmentOperator(
syntax : null,
syntaxTree : null,
left : operand,
right : isPrefix ? boundTemp : newValue,
type : operandType));
return(new BoundSequence(
syntax: node.Syntax,
syntaxTree: node.SyntaxTree,
locals: ReadOnlyArray <LocalSymbol> .CreateFrom(tempSymbol),
sideEffects: assignments,
value: boundTemp,
type: operandType));
}