internal static BoundStatement RewriteXSharpMethod(MethodSymbol method,
BoundStatement body,
int methodOrdinal,
TypeCompilationState compilationState,
DiagnosticBag diagnostics)
{
switch (method.Name)
{
case XSharpSpecialNames.AppInit:
body = LocalRewriter.RewriteAppInit(method, body, diagnostics);
break;
case XSharpSpecialNames.AppExit:
body = LocalRewriter.RewriteAppExit(method, body, diagnostics);
break;
case XSharpSpecialNames.ExitProc:
body = LocalRewriter.RewriteExit(method, body, diagnostics);
break;
case ReservedNames.RunInitProcs:
body = LocalRewriter.RewriteRunInitProc(method, body, diagnostics);
break;
}
switch (method.MethodKind)
{
case MethodKind.PropertyGet:
case MethodKind.PropertySet:
var node = method.GetNonNullSyntaxNode();
if (node.XGenerated)
{
if (body is BoundBlock oldbody)
{
var newbody = new BoundBlock(oldbody.Syntax, oldbody.Locals, oldbody.Statements, oldbody.HasErrors)
{
WasCompilerGenerated = true
};
body = newbody;
}
}
break;
}
var xnode = method.GetNonNullSyntaxNode().XNode as XSharpParserRuleContext;
if (xnode is XSharpParser.ClsmethodContext cmc)
{
xnode = cmc.Member;
}
else if (xnode is XSharpParser.FoxclsmethodContext fmc)
{
xnode = fmc.Member;
}
if (xnode is XSharpParser.IEntityContext iec)
{
body = LocalRewriter.RemoveUnusedVars(iec.Data, body, diagnostics);
}
return(body);
}
/// <summary>
/// The flow analysis pass. This pass reports required diagnostics for unreachable
/// statements and uninitialized variables (through the call to FlowAnalysisWalker.Analyze),
/// and inserts a final return statement if the end of a void-returning method is reachable.
/// </summary>
/// <param name="method">the method to be analyzed</param>
/// <param name="block">the method's body</param>
/// <param name="diagnostics">the receiver of the reported diagnostics</param>
/// <param name="hasTrailingExpression">indicates whether this Script had a trailing expression</param>
/// <param name="originalBodyNested">the original method body is the last statement in the block</param>
/// <returns>the rewritten block for the method (with a return statement possibly inserted)</returns>
public static BoundBlock Rewrite(
MethodSymbol method,
BoundBlock block,
DiagnosticBag diagnostics,
bool hasTrailingExpression,
bool originalBodyNested)
{
#if DEBUG
// We should only see a trailingExpression if we're in a Script initializer.
Debug.Assert(!hasTrailingExpression || method.IsScriptInitializer);
var initialDiagnosticCount = diagnostics.ToReadOnly().Length;
#endif
var compilation = method.DeclaringCompilation;
if (method.ReturnsVoid || method.IsIterator || method.IsTaskReturningAsync(compilation))
{
// we don't analyze synthesized void methods.
if ((method.IsImplicitlyDeclared && !method.IsScriptInitializer) || Analyze(compilation, method, block, diagnostics))
{
block = AppendImplicitReturn(block, method, (CSharpSyntaxNode)(method as SourceMethodSymbol)?.BodySyntax, originalBodyNested);
}
}
else if (Analyze(compilation, method, block, diagnostics))
{
// If the method is a lambda expression being converted to a non-void delegate type
// and the end point is reachable then suppress the error here; a special error
// will be reported by the lambda binder.
Debug.Assert(method.MethodKind != MethodKind.AnonymousFunction);
// Add implicit "return default(T)" if this is a submission that does not have a trailing expression.
var submissionResultType = (method as SynthesizedInteractiveInitializerMethod)?.ResultType;
if (!hasTrailingExpression && ((object)submissionResultType != null))
{
Debug.Assert(submissionResultType.SpecialType != SpecialType.System_Void);
var trailingExpression = new BoundDefaultOperator(method.GetNonNullSyntaxNode(), submissionResultType);
var newStatements = block.Statements.Add(new BoundReturnStatement(trailingExpression.Syntax, RefKind.None, trailingExpression));
block = new BoundBlock(block.Syntax, ImmutableArray <LocalSymbol> .Empty, newStatements)
{
WasCompilerGenerated = true
};
#if DEBUG
// It should not be necessary to repeat analysis after adding this node, because adding a trailing
// return in cases where one was missing should never produce different Diagnostics.
var flowAnalysisDiagnostics = DiagnosticBag.GetInstance();
Debug.Assert(!Analyze(compilation, method, block, flowAnalysisDiagnostics));
Debug.Assert(flowAnalysisDiagnostics.ToReadOnly().SequenceEqual(diagnostics.ToReadOnly().Skip(initialDiagnosticCount)));
flowAnalysisDiagnostics.Free();
#endif
}
// If there's more than one location, then the method is partial and we
// have already reported a non-void partial method error.
else if (method.Locations.Length == 1)
{
diagnostics.Add(ErrorCode.ERR_ReturnExpected, method.Locations[0], method);
}
}
return(block);
}
internal static BoundTypeOrInstanceInitializers RewriteConstructor(
ImmutableArray <BoundInitializer> boundInitializers,
MethodSymbol method
)
{
Debug.Assert(!boundInitializers.IsDefault);
Debug.Assert(
(method.MethodKind == MethodKind.Constructor) ||
(method.MethodKind == MethodKind.StaticConstructor)
);
var sourceMethod = method as SourceMemberMethodSymbol;
var syntax =
((object)sourceMethod != null)
? sourceMethod.SyntaxNode
: method.GetNonNullSyntaxNode();
return(new BoundTypeOrInstanceInitializers(
syntax,
boundInitializers.SelectAsArray(RewriteInitializersAsStatements)
));
}
public static void VerifyMethodThrowsWithBase(MethodSymbol method, MethodSymbol baseMethod, DiagnosticBag diagnostics)
{
if (method.HasThrows && baseMethod != null)
{
var syntax = (MethodDeclarationSyntax)method.GetNonNullSyntaxNode();
if (!baseMethod.HasThrows)
{
diagnostics.Add(ErrorCode.ERR_MissingThrowsOnBaseMethod, syntax.Identifier.GetLocation());
}
else
{
// TODO: Should we use it?
HashSet <DiagnosticInfo> unused = null;
int throwTypeIndex = 0;
foreach (var throwType in method.ThrowsList)
{
bool isDeclaredByBase = false;
foreach (var baseThrowType in baseMethod.ThrowsList)
{
if (throwType.IsEqualToOrDerivedFrom(baseThrowType, TypeCompareKind.ConsiderEverything, ref unused))
{
isDeclaredByBase = true;
break;
}
}
if (!isDeclaredByBase)
{
diagnostics.Add(ErrorCode.ERR_ThrowsNotDeclaredByBaseMethod, syntax.ThrowsList.Types[throwTypeIndex].GetLocation(), throwType.ToDisplayString());
}
throwTypeIndex++;
}
}
}
}
internal static BoundTypeOrInstanceInitializers Rewrite(ImmutableArray <BoundInitializer> boundInitializers, MethodSymbol constructor)
{
Debug.Assert(!boundInitializers.IsDefault);
var boundStatements = ArrayBuilder <BoundStatement> .GetInstance(boundInitializers.Length);
for (int i = 0; i < boundInitializers.Length; i++)
{
var init = boundInitializers[i];
switch (init.Kind)
{
case BoundKind.FieldInitializer:
boundStatements.Add(RewriteFieldInitializer((BoundFieldInitializer)init));
break;
case BoundKind.GlobalStatementInitializer:
var stmtInit = (BoundGlobalStatementInitializer)init;
// the value of the last expression statement (if any) is stored to a ref parameter of the submission constructor:
if (constructor.IsSubmissionConstructor && i == boundInitializers.Length - 1 && stmtInit.Statement.Kind == BoundKind.ExpressionStatement)
{
var syntax = stmtInit.Syntax;
var submissionResultVariable = new BoundParameter(syntax, constructor.Parameters[1]);
var expr = ((BoundExpressionStatement)stmtInit.Statement).Expression;
// The expression is converted to the submission result type when the initializer is bound,
// so we just need to assign it to the out parameter:
if ((object)expr.Type != null && expr.Type.SpecialType != SpecialType.System_Void)
{
boundStatements.Add(
new BoundExpressionStatement(syntax,
new BoundAssignmentOperator(syntax,
submissionResultVariable,
expr,
expr.Type
)
));
break;
}
}
boundStatements.Add(stmtInit.Statement);
break;
default:
throw ExceptionUtilities.UnexpectedValue(init.Kind);
}
}
Debug.Assert(boundStatements.Count == boundInitializers.Length);
CSharpSyntaxNode listSyntax;
SourceMethodSymbol sourceConstructor = constructor as SourceMethodSymbol;
if ((object)sourceConstructor != null)
{
listSyntax = sourceConstructor.SyntaxNode;
}
else
{
listSyntax = constructor.GetNonNullSyntaxNode();
}
return(new BoundTypeOrInstanceInitializers(listSyntax, boundStatements.ToImmutableAndFree()));
}
internal static BoundCall GenerateObjectConstructorInitializer(MethodSymbol constructor, DiagnosticBag diagnostics)
{
NamedTypeSymbol objectType = constructor.ContainingType.BaseTypeNoUseSiteDiagnostics;
Debug.Assert(objectType.SpecialType == SpecialType.System_Object);
MethodSymbol objectConstructor = null;
LookupResultKind resultKind = LookupResultKind.Viable;
foreach (MethodSymbol objectCtor in objectType.InstanceConstructors)
{
if (objectCtor.ParameterCount == 0)
{
objectConstructor = objectCtor;
break;
}
}
// UNDONE: If this happens then something is deeply wrong. Should we give a better error?
if ((object)objectConstructor == null)
{
diagnostics.Add(ErrorCode.ERR_BadCtorArgCount, constructor.Locations[0], objectType, /*desired param count*/ 0);
return(null);
}
// UNDONE: If this happens then something is deeply wrong. Should we give a better error?
bool hasErrors = false;
HashSet <DiagnosticInfo> useSiteDiagnostics = null;
if (!AccessCheck.IsSymbolAccessible(objectConstructor, constructor.ContainingType, ref useSiteDiagnostics))
{
diagnostics.Add(ErrorCode.ERR_BadAccess, constructor.Locations[0], objectConstructor);
resultKind = LookupResultKind.Inaccessible;
hasErrors = true;
}
if (!useSiteDiagnostics.IsNullOrEmpty())
{
diagnostics.Add(constructor.Locations.IsEmpty ? NoLocation.Singleton : constructor.Locations[0], useSiteDiagnostics);
}
CSharpSyntaxNode syntax = constructor.GetNonNullSyntaxNode();
BoundExpression receiver = new BoundThisReference(syntax, constructor.ContainingType)
{
WasCompilerGenerated = true
};
return(new BoundCall(
syntax: syntax,
receiverOpt: receiver,
method: objectConstructor,
arguments: ImmutableArray <BoundExpression> .Empty,
argumentNamesOpt: ImmutableArray <string> .Empty,
argumentRefKindsOpt: ImmutableArray <RefKind> .Empty,
isDelegateCall: false,
expanded: false,
invokedAsExtensionMethod: false,
argsToParamsOpt: ImmutableArray <int> .Empty,
resultKind: resultKind,
type: objectType,
hasErrors: hasErrors)
{
WasCompilerGenerated = true
});
}
/// <summary>
/// Bind the (implicit or explicit) constructor initializer of a constructor symbol.
/// </summary>
/// <param name="constructor">Constructor method.</param>
/// <param name="diagnostics">Accumulates errors (e.g. access "this" in constructor initializer).</param>
/// <param name="compilation">Used to retrieve binder.</param>
/// <returns>A bound expression for the constructor initializer call.</returns>
private static BoundExpression BindConstructorInitializer(MethodSymbol constructor, DiagnosticBag diagnostics, CSharpCompilation compilation)
{
// Note that the base type can be null if we're compiling System.Object in source.
NamedTypeSymbol baseType = constructor.ContainingType.BaseTypeNoUseSiteDiagnostics;
SourceMethodSymbol sourceConstructor = constructor as SourceMethodSymbol;
CSharpSyntaxNode syntax = null;
ArgumentListSyntax initializerArgumentListOpt = null;
if ((object)sourceConstructor != null)
{
syntax = sourceConstructor.SyntaxNode;
if (syntax.Kind == SyntaxKind.ConstructorDeclaration)
{
var constructorSyntax = (ConstructorDeclarationSyntax)syntax;
if (constructorSyntax.Initializer != null)
{
initializerArgumentListOpt = constructorSyntax.Initializer.ArgumentList;
}
ErrorCode reportIfHavePrimaryCtor = ErrorCode.Void;
if (initializerArgumentListOpt == null || initializerArgumentListOpt.Parent.Kind != SyntaxKind.ThisConstructorInitializer)
{
reportIfHavePrimaryCtor = ErrorCode.ERR_InstanceCtorMustHaveThisInitializer;
}
else if (initializerArgumentListOpt.Arguments.Count == 0 && constructor.ContainingType.TypeKind == TypeKind.Struct)
{
// Based on C# Design Notes for Oct 21, 2013:
reportIfHavePrimaryCtor = ErrorCode.ERR_InstanceCtorCannotHaveDefaultThisInitializer;
}
if (reportIfHavePrimaryCtor != ErrorCode.Void)
{
var container = constructor.ContainingType as SourceMemberContainerTypeSymbol;
if ((object)container != null && (object)container.PrimaryCtor != null)
{
diagnostics.Add(reportIfHavePrimaryCtor, constructor.Locations[0]);
}
}
}
else
{
// Primary constuctor case.
Debug.Assert(syntax.Kind == SyntaxKind.ParameterList);
if (syntax.Parent.Kind == SyntaxKind.ClassDeclaration)
{
var classDecl = (ClassDeclarationSyntax)syntax.Parent;
if (classDecl.BaseList != null && classDecl.BaseList.Types.Count > 0)
{
TypeSyntax baseTypeSyntax = classDecl.BaseList.Types[0];
if (baseTypeSyntax.Kind == SyntaxKind.BaseClassWithArguments)
{
initializerArgumentListOpt = ((BaseClassWithArgumentsSyntax)baseTypeSyntax).ArgumentList;
}
}
}
else
{
Debug.Assert(syntax.Parent.Kind == SyntaxKind.StructDeclaration);
}
}
}
// The common case is that we have no constructor initializer and the type inherits directly from object.
// Also, we might be trying to generate a constructor for an entirely compiler-generated class such
// as a closure class; in that case it is vexing to try to find a suitable binder for the non-existing
// constructor syntax so that we can do unnecessary overload resolution on the non-existing initializer!
// Simply take the early out: bind directly to the parameterless object ctor rather than attempting
// overload resolution.
if (initializerArgumentListOpt == null && (object)baseType != null)
{
if (baseType.SpecialType == SpecialType.System_Object)
{
return(GenerateObjectConstructorInitializer(constructor, diagnostics));
}
else if (baseType.IsErrorType() || baseType.IsStatic)
{
// If the base type is bad and there is no initializer then we can just bail.
// We have no expressions we need to analyze to report errors on.
return(null);
}
}
// Either our base type is not object, or we have an initializer syntax, or both. We're going to
// need to do overload resolution on the set of constructors of the base type, either on
// the provided initializer syntax, or on an implicit ": base()" syntax.
// SPEC ERROR: The specification states that if you have the situation
// SPEC ERROR: class B { ... } class D1 : B {} then the default constructor
// SPEC ERROR: generated for D1 must call an accessible *parameterless* constructor
// SPEC ERROR: in B. However, it also states that if you have
// SPEC ERROR: class B { ... } class D2 : B { D2() {} } or
// SPEC ERROR: class B { ... } class D3 : B { D3() : base() {} } then
// SPEC ERROR: the compiler performs *overload resolution* to determine
// SPEC ERROR: which accessible constructor of B is called. Since B might have
// SPEC ERROR: a ctor with all optional parameters, overload resolution might
// SPEC ERROR: succeed even if there is no parameterless constructor. This
// SPEC ERROR: is unintentionally inconsistent, and the native compiler does not
// SPEC ERROR: implement this behavior. Rather, we should say in the spec that
// SPEC ERROR: if there is no ctor in D1, then a ctor is created for you exactly
// SPEC ERROR: as though you'd said "D1() : base() {}".
// SPEC ERROR: This is what we now do in Roslyn.
// Now, in order to do overload resolution, we're going to need a binder. There are
// three possible situations:
//
// class D1 : B { }
// class D2 : B { D2(int x) { } }
// class D3 : B { D3(int x) : base(x) { } }
//
// In the first case the binder needs to be the binder associated with
// the *body* of D1 because if the base class ctor is protected, we need
// to be inside the body of a derived class in order for it to be in the
// accessibility domain of the protected base class ctor.
//
// In the second case the binder could be the binder associated with
// the body of D2; since the implicit call to base() will have no arguments
// there is no need to look up "x".
//
// In the third case the binder must be the binder that knows about "x"
// because x is in scope.
Binder outerBinder;
if ((object)sourceConstructor == null)
{
// The constructor is implicit. We need to get the binder for the body
// of the enclosing class.
CSharpSyntaxNode containerNode = constructor.GetNonNullSyntaxNode();
SyntaxToken bodyToken;
if (containerNode.Kind == SyntaxKind.ClassDeclaration)
{
bodyToken = ((ClassDeclarationSyntax)containerNode).OpenBraceToken;
}
else if (containerNode.Kind == SyntaxKind.StructDeclaration)
{
bodyToken = ((StructDeclarationSyntax)containerNode).OpenBraceToken;
}
else if (containerNode.Kind == SyntaxKind.EnumDeclaration)
{
// We're not going to find any non-default ctors, but we'll look anyway.
bodyToken = ((EnumDeclarationSyntax)containerNode).OpenBraceToken;
}
else
{
Debug.Assert(false, "How did we get an implicit constructor added to something that is neither a class nor a struct?");
bodyToken = containerNode.GetFirstToken();
}
outerBinder = compilation.GetBinderFactory(containerNode.SyntaxTree).GetBinder(containerNode, bodyToken.Position);
}
else if (initializerArgumentListOpt == null)
{
// We have a ctor in source but no explicit constructor initializer. We can't just use the binder for the
// type containing the ctor because the ctor might be marked unsafe. Use the binder for the parameter list
// as an approximation - the extra symbols won't matter because there are no identifiers to bind.
outerBinder = compilation.GetBinderFactory(sourceConstructor.SyntaxTree).GetBinder(syntax.Kind == SyntaxKind.ParameterList ?
syntax :
((ConstructorDeclarationSyntax)syntax).ParameterList);
}
else
{
outerBinder = compilation.GetBinderFactory(sourceConstructor.SyntaxTree).GetBinder(initializerArgumentListOpt);
}
//wrap in ConstructorInitializerBinder for appropriate errors
Binder initializerBinder = outerBinder.WithAdditionalFlagsAndContainingMemberOrLambda(BinderFlags.ConstructorInitializer, constructor);
return(initializerBinder.BindConstructorInitializer(initializerArgumentListOpt, constructor, diagnostics));
}
// NOTE: can return null if the method has no body.
internal static BoundBlock BindMethodBody(MethodSymbol method, TypeCompilationState compilationState, DiagnosticBag diagnostics, bool generateDebugInfo, out ConsList <Imports> debugImports)
{
debugImports = null;
BoundStatement constructorInitializer = null;
BoundBlock body;
var compilation = method.DeclaringCompilation;
var sourceMethod = method as SourceMethodSymbol;
if ((object)sourceMethod != null)
{
if (sourceMethod.IsExtern)
{
if (sourceMethod.BlockSyntax == null)
{
// Generate warnings only if we are not generating ERR_ExternHasBody error
GenerateExternalMethodWarnings(sourceMethod, diagnostics);
}
return(null);
}
else if (sourceMethod.IsParameterlessValueTypeConstructor(requireSynthesized: true))
{
// No body for default struct constructor.
return(null);
}
var blockSyntax = sourceMethod.BlockSyntax;
if (blockSyntax != null)
{
var factory = compilation.GetBinderFactory(sourceMethod.SyntaxTree);
var inMethodBinder = factory.GetBinder(blockSyntax);
var binder = new ExecutableCodeBinder(blockSyntax, sourceMethod, inMethodBinder);
body = binder.BindBlock(blockSyntax, diagnostics);
if (generateDebugInfo)
{
debugImports = binder.ImportsList;
}
if (inMethodBinder.IsDirectlyInIterator)
{
foreach (var parameter in method.Parameters)
{
if (parameter.RefKind != RefKind.None)
{
diagnostics.Add(ErrorCode.ERR_BadIteratorArgType, parameter.Locations[0]);
}
else if (parameter.Type.IsUnsafe())
{
diagnostics.Add(ErrorCode.ERR_UnsafeIteratorArgType, parameter.Locations[0]);
}
}
if (sourceMethod.IsUnsafe && compilation.Options.AllowUnsafe) // Don't cascade
{
diagnostics.Add(ErrorCode.ERR_IllegalInnerUnsafe, sourceMethod.Locations[0]);
}
if (sourceMethod.IsVararg)
{
// error CS1636: __arglist is not allowed in the parameter list of iterators
diagnostics.Add(ErrorCode.ERR_VarargsIterator, sourceMethod.Locations[0]);
}
}
}
else // for [if (blockSyntax != null)]
{
var property = sourceMethod.AssociatedSymbol as SourcePropertySymbol;
if ((object)property != null && property.IsAutoProperty)
{
return(MethodBodySynthesizer.ConstructAutoPropertyAccessorBody(sourceMethod));
}
if (sourceMethod.IsPrimaryCtor)
{
body = null;
}
else
{
return(null);
}
}
}
else
{
// synthesized methods should return their bound bodies
body = null;
}
// delegates have constructors but not constructor initializers
if (method.MethodKind == MethodKind.Constructor && !method.ContainingType.IsDelegateType())
{
var initializerInvocation = BindConstructorInitializer(method, diagnostics, compilation);
if (initializerInvocation != null)
{
constructorInitializer = new BoundExpressionStatement(initializerInvocation.Syntax, initializerInvocation)
{
WasCompilerGenerated = true
};
Debug.Assert(initializerInvocation.HasAnyErrors || constructorInitializer.IsConstructorInitializer(), "Please keep this bound node in sync with BoundNodeExtensions.IsConstructorInitializer.");
}
}
var statements = ArrayBuilder <BoundStatement> .GetInstance();
if (constructorInitializer != null)
{
statements.Add(constructorInitializer);
}
if ((object)sourceMethod != null && sourceMethod.IsPrimaryCtor && (object)((SourceMemberContainerTypeSymbol)sourceMethod.ContainingType).PrimaryCtor == (object)sourceMethod)
{
Debug.Assert(method.MethodKind == MethodKind.Constructor && !method.ContainingType.IsDelegateType());
Debug.Assert(body == null);
if (sourceMethod.ParameterCount > 0)
{
var factory = new SyntheticBoundNodeFactory(sourceMethod, sourceMethod.SyntaxNode, compilationState, diagnostics);
factory.CurrentMethod = sourceMethod;
foreach (var parameter in sourceMethod.Parameters)
{
FieldSymbol field = parameter.PrimaryConstructorParameterBackingField;
if ((object)field != null)
{
statements.Add(factory.Assignment(factory.Field(factory.This(), field),
factory.Parameter(parameter)));
}
}
}
}
if (body != null)
{
statements.Add(body);
}
CSharpSyntaxNode syntax = body != null ? body.Syntax : method.GetNonNullSyntaxNode();
BoundBlock block;
if (statements.Count == 1 && statements[0].Kind == ((body == null) ? BoundKind.Block : body.Kind))
{
// most common case - we just have a single block for the body.
block = (BoundBlock)statements[0];
statements.Free();
}
else
{
block = new BoundBlock(syntax, default(ImmutableArray <LocalSymbol>), statements.ToImmutableAndFree())
{
WasCompilerGenerated = true
};
}
return(method.MethodKind == MethodKind.Destructor ? MethodBodySynthesizer.ConstructDestructorBody(syntax, method, block) : block);
}
public static BoundBlock Rewrite(
MethodSymbol method,
BoundBlock block,
TypeCompilationState compilationState,
BindingDiagnosticBag diagnostics,
bool hasTrailingExpression,
bool originalBodyNested)
{
#if DEBUG
// We should only see a trailingExpression if we're in a Script initializer.
Debug.Assert(!hasTrailingExpression || method.IsScriptInitializer);
var initialDiagnosticCount = diagnostics.ToReadOnly().Diagnostics.Length;
#endif
var compilation = method.DeclaringCompilation;
if (method.ReturnsVoid || method.IsIterator || method.IsAsyncEffectivelyReturningTask(compilation))
{
ImmutableArray <FieldSymbol> implicitlyInitializedFields = default;
bool needsImplicitReturn = true;
// we don't analyze synthesized void methods.
if ((method.IsImplicitlyDeclared && !method.IsScriptInitializer) ||
Analyze(compilation, method, block, diagnostics.DiagnosticBag, out needsImplicitReturn, out implicitlyInitializedFields))
{
if (!implicitlyInitializedFields.IsDefault)
{
Debug.Assert(!implicitlyInitializedFields.IsEmpty);
block = PrependImplicitInitializations(block, method, implicitlyInitializedFields, compilationState, diagnostics);
}
if (needsImplicitReturn)
{
block = AppendImplicitReturn(block, method, originalBodyNested);
}
}
}
else if (Analyze(compilation, method, block, diagnostics.DiagnosticBag, out var needsImplicitReturn, out var unusedImplicitlyInitializedFields))
{
Debug.Assert(unusedImplicitlyInitializedFields.IsDefault);
Debug.Assert(needsImplicitReturn);
// If the method is a lambda expression being converted to a non-void delegate type
// and the end point is reachable then suppress the error here; a special error
// will be reported by the lambda binder.
Debug.Assert(method.MethodKind != MethodKind.AnonymousFunction);
// Add implicit "return default(T)" if this is a submission that does not have a trailing expression.
var submissionResultType = (method as SynthesizedInteractiveInitializerMethod)?.ResultType;
if (!hasTrailingExpression && ((object)submissionResultType != null))
{
Debug.Assert(!submissionResultType.IsVoidType());
var trailingExpression = new BoundDefaultExpression(method.GetNonNullSyntaxNode(), submissionResultType);
var newStatements = block.Statements.Add(new BoundReturnStatement(trailingExpression.Syntax, RefKind.None, trailingExpression, @checked: false));
block = new BoundBlock(block.Syntax, ImmutableArray <LocalSymbol> .Empty, newStatements)
{
WasCompilerGenerated = true
};
#if DEBUG
// It should not be necessary to repeat analysis after adding this node, because adding a trailing
// return in cases where one was missing should never produce different Diagnostics.
IEnumerable <Diagnostic> getErrorsOnly(IEnumerable <Diagnostic> diags) => diags.Where(d => d.Severity == DiagnosticSeverity.Error);
var flowAnalysisDiagnostics = DiagnosticBag.GetInstance();
Debug.Assert(!Analyze(compilation, method, block, flowAnalysisDiagnostics, needsImplicitReturn: out _, out unusedImplicitlyInitializedFields));
Debug.Assert(unusedImplicitlyInitializedFields.IsDefault);
// Ignore warnings since flow analysis reports nullability mismatches.
Debug.Assert(getErrorsOnly(flowAnalysisDiagnostics.ToReadOnly()).SequenceEqual(getErrorsOnly(diagnostics.ToReadOnly().Diagnostics.Skip(initialDiagnosticCount))));
flowAnalysisDiagnostics.Free();
#endif
}
// If there's more than one location, then the method is partial and we
// have already reported a non-void partial method error.
else if (method.Locations.Length == 1)
{
diagnostics.Add(ErrorCode.ERR_ReturnExpected, method.Locations[0], method);
}
}
return(block);
}
internal static BoundStatementList Rewrite(ImmutableArray <BoundInitializer> boundInitializers, MethodSymbol constructor)
{
Debug.Assert(!boundInitializers.IsDefault);
var boundStatements = new BoundStatement[boundInitializers.Length];
for (int i = 0; i < boundStatements.Length; i++)
{
var init = boundInitializers[i];
var syntax = init.Syntax;
switch (init.Kind)
{
case BoundKind.FieldInitializer:
var fieldInit = (BoundFieldInitializer)init;
var boundReceiver = fieldInit.Field.IsStatic ? null :
new BoundThisReference(syntax, fieldInit.Field.ContainingType);
// Mark this as CompilerGenerated so that the local rewriter doesn't add a sequence point.
boundStatements[i] =
new BoundExpressionStatement(syntax,
new BoundAssignmentOperator(syntax,
new BoundFieldAccess(syntax,
boundReceiver,
fieldInit.Field,
constantValueOpt: null),
fieldInit.InitialValue,
fieldInit.Field.Type)
{
WasCompilerGenerated = true
})
{
WasCompilerGenerated = true
};
Debug.Assert(syntax is ExpressionSyntax); // Should be the initial value.
Debug.Assert(syntax.Parent.Kind == SyntaxKind.EqualsValueClause);
Debug.Assert(syntax.Parent.Parent.Kind == SyntaxKind.VariableDeclarator);
Debug.Assert(syntax.Parent.Parent.Parent.Kind == SyntaxKind.VariableDeclaration);
var declaratorSyntax = (VariableDeclaratorSyntax)syntax.Parent.Parent;
boundStatements[i] = LocalRewriter.AddSequencePoint(declaratorSyntax, boundStatements[i]);
break;
case BoundKind.GlobalStatementInitializer:
var stmtInit = (BoundGlobalStatementInitializer)init;
// the value of the last expression statement (if any) is stored to a ref parameter of the submission constructor:
if (constructor.IsSubmissionConstructor && i == boundStatements.Length - 1 && stmtInit.Statement.Kind == BoundKind.ExpressionStatement)
{
var submissionResultVariable = new BoundParameter(syntax, constructor.Parameters[1]);
var expr = ((BoundExpressionStatement)stmtInit.Statement).Expression;
// The expression is converted to the submission result type when the initializer is bound,
// so we just need to assign it to the out parameter:
if ((object)expr.Type != null && expr.Type.SpecialType != SpecialType.System_Void)
{
boundStatements[i] =
new BoundExpressionStatement(syntax,
new BoundAssignmentOperator(syntax,
submissionResultVariable,
expr,
expr.Type
)
);
break;
}
}
boundStatements[i] = stmtInit.Statement;
break;
default:
throw ExceptionUtilities.UnexpectedValue(init.Kind);
}
}
CSharpSyntaxNode listSyntax;
SourceMethodSymbol sourceConstructor = constructor as SourceMethodSymbol;
if ((object)sourceConstructor != null)
{
listSyntax = sourceConstructor.SyntaxNode;
}
else
{
listSyntax = constructor.GetNonNullSyntaxNode();
}
return(new BoundStatementList(listSyntax, boundStatements.AsImmutableOrNull()));
}
//TODO: it might be nice to make this a static method on Compiler
private void CompileMethod(
MethodSymbol methodSymbol,
ref ProcessedFieldInitializers processedInitializers,
SynthesizedSubmissionFields previousSubmissionFields,
TypeCompilationState compilationState)
{
cancellationToken.ThrowIfCancellationRequested();
SourceMethodSymbol sourceMethod = methodSymbol as SourceMethodSymbol;
if (methodSymbol.IsAbstract)
{
if ((object)sourceMethod != null)
{
bool diagsWritten;
sourceMethod.SetDiagnostics(ImmutableArray <Diagnostic> .Empty, out diagsWritten);
if (diagsWritten && !methodSymbol.IsImplicitlyDeclared && compilation.EventQueue != null)
{
compilation.SymbolDeclaredEvent(methodSymbol);
}
}
return;
}
// get cached diagnostics if not building and we have 'em
bool calculateDiagnosticsOnly = moduleBeingBuilt == null;
if (calculateDiagnosticsOnly && ((object)sourceMethod != null))
{
var cachedDiagnostics = sourceMethod.Diagnostics;
if (!cachedDiagnostics.IsDefault)
{
this.diagnostics.AddRange(cachedDiagnostics);
return;
}
}
ConsList <Imports> oldDebugImports = compilationState.CurrentDebugImports;
// In order to avoid generating code for methods with errors, we create a diagnostic bag just for this method.
DiagnosticBag diagsForCurrentMethod = DiagnosticBag.GetInstance();
try
{
bool includeInitializersInBody;
BoundBlock body;
// if synthesized method returns its body in lowered form
if (methodSymbol.SynthesizesLoweredBoundBody)
{
if (moduleBeingBuilt != null)
{
methodSymbol.GenerateMethodBody(compilationState, diagsForCurrentMethod);
this.diagnostics.AddRange(diagsForCurrentMethod);
}
return;
}
//EDMAURER initializers that have been analyzed but not yet lowered.
BoundStatementList analyzedInitializers = null;
ConsList <Imports> debugImports;
if (methodSymbol.IsScriptConstructor)
{
// rewrite top-level statements and script variable declarations to a list of statements and assignments, respectively:
BoundStatementList initializerStatements = InitializerRewriter.Rewrite(processedInitializers.BoundInitializers, methodSymbol);
// the lowered script initializers should not be treated as initializers anymore but as a method body:
body = new BoundBlock(initializerStatements.Syntax, ImmutableArray <LocalSymbol> .Empty, initializerStatements.Statements)
{
WasCompilerGenerated = true
};
includeInitializersInBody = false;
debugImports = null;
}
else
{
// do not emit initializers if we are invoking another constructor of this class:
includeInitializersInBody = !processedInitializers.BoundInitializers.IsDefaultOrEmpty && !HasThisConstructorInitializer(methodSymbol);
// lower initializers just once. the lowered tree will be reused when emitting all constructors
// with field initializers. Once lowered, these initializers will be stashed in processedInitializers.LoweredInitializers
// (see later in this method). Don't bother lowering _now_ if this particular ctor won't have the initializers
// appended to its body.
if (includeInitializersInBody && processedInitializers.LoweredInitializers == null)
{
analyzedInitializers = InitializerRewriter.Rewrite(processedInitializers.BoundInitializers, methodSymbol);
processedInitializers.HasErrors = processedInitializers.HasErrors || analyzedInitializers.HasAnyErrors;
// These analyses check for diagnostics in lambdas.
// Control flow analysis and implicit return insertion are unnecessary.
DataFlowPass.Analyze(compilation, methodSymbol, analyzedInitializers, diagsForCurrentMethod, requireOutParamsAssigned: false);
DiagnosticsPass.IssueDiagnostics(compilation, analyzedInitializers, diagsForCurrentMethod, methodSymbol);
}
body = Compiler.BindMethodBody(methodSymbol, diagsForCurrentMethod, this.generateDebugInfo, out debugImports);
}
#if DEBUG
// If the method is a synthesized static or instance constructor, then debugImports will be null and we will use the value
// from the first field initializer.
if (this.generateDebugInfo)
{
if ((methodSymbol.MethodKind == MethodKind.Constructor || methodSymbol.MethodKind == MethodKind.StaticConstructor) && methodSymbol.IsImplicitlyDeclared)
{
// There was no body to bind, so we didn't get anything from Compiler.BindMethodBody.
Debug.Assert(debugImports == null);
// Either there were no field initializers or we grabbed debug imports from the first one.
Debug.Assert(processedInitializers.BoundInitializers.IsDefaultOrEmpty || processedInitializers.FirstDebugImports != null);
}
}
#endif
debugImports = debugImports ?? processedInitializers.FirstDebugImports;
// Associate these debug imports with all methods generated from this one.
compilationState.CurrentDebugImports = debugImports;
if (body != null && methodSymbol is SourceMethodSymbol)
{
// TODO: Do we need to issue warnings for non-SourceMethodSymbol methods, like synthesized ctors?
DiagnosticsPass.IssueDiagnostics(compilation, body, diagsForCurrentMethod, methodSymbol);
}
BoundBlock flowAnalyzedBody = null;
if (body != null)
{
flowAnalyzedBody = FlowAnalysisPass.Rewrite(methodSymbol, body, diagsForCurrentMethod);
}
bool hasErrors = hasDeclarationErrors || diagsForCurrentMethod.HasAnyErrors() || processedInitializers.HasErrors;
// Record whether or not the bound tree for the lowered method body (including any initializers) contained any
// errors (note: errors, not diagnostics).
SetGlobalErrorIfTrue(hasErrors);
bool diagsWritten = false;
var actualDiagnostics = diagsForCurrentMethod.ToReadOnly();
if (sourceMethod != null)
{
actualDiagnostics = sourceMethod.SetDiagnostics(actualDiagnostics, out diagsWritten);
}
if (diagsWritten && !methodSymbol.IsImplicitlyDeclared && compilation.EventQueue != null)
{
var lazySemanticModel = body == null ? null : new Lazy <SemanticModel>(() =>
{
var syntax = body.Syntax;
var semanticModel = (CSharpSemanticModel)compilation.GetSemanticModel(syntax.SyntaxTree);
var memberModel = semanticModel.GetMemberModel(syntax);
if (memberModel != null)
{
memberModel.AddBoundTreeForStandaloneSyntax(syntax, body);
}
return(semanticModel);
});
compilation.EventQueue.Enqueue(new CompilationEvent.SymbolDeclared(compilation, methodSymbol, lazySemanticModel));
}
// Don't lower if we're not emitting or if there were errors.
// Methods that had binding errors are considered too broken to be lowered reliably.
if (calculateDiagnosticsOnly || hasErrors)
{
this.diagnostics.AddRange(actualDiagnostics);
return;
}
// ############################
// LOWERING AND EMIT
// Any errors generated below here are considered Emit diagnostics
// and will not be reported to callers Compilation.GetDiagnostics()
BoundStatement loweredBody = (flowAnalyzedBody == null) ? null :
Compiler.LowerStatement(this.generateDebugInfo, methodSymbol, flowAnalyzedBody, previousSubmissionFields, compilationState, diagsForCurrentMethod);
bool hasBody = loweredBody != null;
hasErrors = hasErrors || (hasBody && loweredBody.HasErrors) || diagsForCurrentMethod.HasAnyErrors();
SetGlobalErrorIfTrue(hasErrors);
// don't emit if the resulting method would contain initializers with errors
if (!hasErrors && (hasBody || includeInitializersInBody))
{
// Fields must be initialized before constructor initializer (which is the first statement of the analyzed body, if specified),
// so that the initialization occurs before any method overridden by the declaring class can be invoked from the base constructor
// and access the fields.
ImmutableArray <BoundStatement> boundStatements;
if (methodSymbol.IsScriptConstructor)
{
boundStatements = MethodBodySynthesizer.ConstructScriptConstructorBody(loweredBody, methodSymbol, previousSubmissionFields, compilation);
}
else
{
boundStatements = ImmutableArray <BoundStatement> .Empty;
if (analyzedInitializers != null)
{
processedInitializers.LoweredInitializers = (BoundStatementList)Compiler.LowerStatement(
this.generateDebugInfo,
methodSymbol,
analyzedInitializers,
previousSubmissionFields,
compilationState,
diagsForCurrentMethod);
Debug.Assert(!hasErrors);
hasErrors = processedInitializers.LoweredInitializers.HasAnyErrors || diagsForCurrentMethod.HasAnyErrors();
SetGlobalErrorIfTrue(hasErrors);
if (hasErrors)
{
this.diagnostics.AddRange(diagsForCurrentMethod);
return;
}
}
// initializers for global code have already been included in the body
if (includeInitializersInBody)
{
//TODO: rewrite any BoundThis and BoundBase nodes in the initializers to have the correct ThisParameter symbol
if (compilation.Options.Optimize)
{
// TODO: this part may conflict with InitializerRewriter.Rewrite in how it handles
// the first field initializer (see 'if (i == 0)'...) which seems suspicious
ArrayBuilder <BoundStatement> statements = ArrayBuilder <BoundStatement> .GetInstance();
statements.AddRange(boundStatements);
bool anyNonDefault = false;
foreach (var initializer in processedInitializers.LoweredInitializers.Statements)
{
if (ShouldOptimizeOutInitializer(initializer))
{
if (methodSymbol.IsStatic)
{
// NOTE: Dev11 removes static initializers if ONLY all of them are optimized out
statements.Add(initializer);
}
}
else
{
statements.Add(initializer);
anyNonDefault = true;
}
}
if (anyNonDefault)
{
boundStatements = statements.ToImmutableAndFree();
}
else
{
statements.Free();
}
}
else
{
boundStatements = boundStatements.Concat(processedInitializers.LoweredInitializers.Statements);
}
}
if (hasBody)
{
boundStatements = boundStatements.Concat(ImmutableArray.Create(loweredBody));
}
}
CSharpSyntaxNode syntax = methodSymbol.GetNonNullSyntaxNode();
var boundBody = BoundStatementList.Synthesized(syntax, boundStatements);
var emittedBody = Compiler.GenerateMethodBody(
compilationState,
methodSymbol,
boundBody,
diagsForCurrentMethod,
optimize,
debugDocumentProvider,
GetNamespaceScopes(methodSymbol, debugImports));
moduleBeingBuilt.SetMethodBody(methodSymbol, emittedBody);
}
this.diagnostics.AddRange(diagsForCurrentMethod);
}
finally
{
diagsForCurrentMethod.Free();
compilationState.CurrentDebugImports = oldDebugImports;
}
}
internal static BoundTypeOrInstanceInitializers Rewrite(ImmutableArray <BoundInitializer> boundInitializers, MethodSymbol method, TypeSymbol submissionResultTypeOpt)
{
Debug.Assert(!boundInitializers.IsDefault);
Debug.Assert(method.IsSubmissionInitializer == ((object)submissionResultTypeOpt != null));
var boundStatements = ArrayBuilder <BoundStatement> .GetInstance(boundInitializers.Length);
BoundExpression submissionResult = null;
for (int i = 0; i < boundInitializers.Length; i++)
{
var init = boundInitializers[i];
switch (init.Kind)
{
case BoundKind.FieldInitializer:
boundStatements.Add(RewriteFieldInitializer((BoundFieldInitializer)init));
break;
case BoundKind.GlobalStatementInitializer:
var statement = ((BoundGlobalStatementInitializer)init).Statement;
// The value of the last expression statement (if any) is returned from the submission initializer.
if ((object)submissionResultTypeOpt != null &&
i == boundInitializers.Length - 1 &&
statement.Kind == BoundKind.ExpressionStatement)
{
var expr = ((BoundExpressionStatement)statement).Expression;
if ((object)expr.Type != null && expr.Type.SpecialType != SpecialType.System_Void)
{
submissionResult = expr;
break;
}
}
boundStatements.Add(statement);
break;
default:
throw ExceptionUtilities.UnexpectedValue(init.Kind);
}
}
var sourceMethod = method as SourceMethodSymbol;
var syntax = ((object)sourceMethod != null) ? sourceMethod.SyntaxNode : method.GetNonNullSyntaxNode();
if ((object)submissionResultTypeOpt != null)
{
if (submissionResult == null)
{
// Return null if submission does not have a trailing expression.
Debug.Assert(submissionResultTypeOpt.IsReferenceType);
submissionResult = new BoundLiteral(syntax, ConstantValue.Null, submissionResultTypeOpt);
}
Debug.Assert((object)submissionResult.Type != null);
Debug.Assert(submissionResult.Type.SpecialType != SpecialType.System_Void);
// The expression is converted to the submission result type when the initializer is bound.
boundStatements.Add(new BoundReturnStatement(submissionResult.Syntax, submissionResult));
}
return(new BoundTypeOrInstanceInitializers(syntax, boundStatements.ToImmutableAndFree()));
}