public override BoundNode VisitBlock(BoundBlock node)
{
if (!this.Instrument || (node != _rootStatement && (node.WasCompilerGenerated || node.Syntax.Kind() != SyntaxKind.Block)))
{
return(node.Update(node.Locals, node.LocalFunctions, VisitList(node.Statements)));
}
var builder = ArrayBuilder <BoundStatement> .GetInstance();
for (int i = 0; i < node.Statements.Length; i++)
{
var stmt = (BoundStatement)Visit(node.Statements[i]);
if (stmt != null)
{
builder.Add(stmt);
}
}
LocalSymbol synthesizedLocal;
BoundStatement prologue = _instrumenter.CreateBlockPrologue(node, out synthesizedLocal);
if (prologue != null)
{
builder.Insert(0, prologue);
}
BoundStatement epilogue = _instrumenter.CreateBlockEpilogue(node);
if (epilogue != null)
{
builder.Add(epilogue);
}
return(new BoundBlock(node.Syntax, synthesizedLocal == null ? node.Locals : node.Locals.Add(synthesizedLocal), node.LocalFunctions, builder.ToImmutableAndFree(), node.HasErrors));
}
public override BoundNode VisitBlock(BoundBlock node)
{
if (node.WasCompilerGenerated || !this.generateDebugInfo)
{
return node.Update(node.LocalsOpt, VisitList(node.Statements));
}
BlockSyntax syntax = node.Syntax as BlockSyntax;
Debug.Assert(syntax != null);
var builder = ArrayBuilder<BoundStatement>.GetInstance();
var oBspan = syntax.OpenBraceToken.Span;
builder.Add(new BoundSequencePointWithSpan(syntax, null, oBspan));
for (int i = 0; i < node.Statements.Length; i++)
{
var stmt = (BoundStatement)Visit(node.Statements[i]);
if (stmt != null) builder.Add(stmt);
}
// no need to mark "}" on the outermost block
// as it cannot leave it normally. The block will have "return" at the end.
if (syntax.Parent == null || !(syntax.Parent.IsAnonymousFunction() || syntax.Parent is BaseMethodDeclarationSyntax))
{
var cBspan = syntax.CloseBraceToken.Span;
builder.Add(new BoundSequencePointWithSpan(syntax, null, cBspan));
}
return new BoundBlock(syntax, node.LocalsOpt, builder.ToImmutableAndFree(), node.HasErrors);
}
protected BoundBlock RewriteBlock(BoundBlock node, ArrayBuilder <BoundExpression> prologue, ArrayBuilder <LocalSymbol> newLocals)
{
AddLocals(node.LocalsOpt, newLocals);
var newStatements = ArrayBuilder <BoundStatement> .GetInstance();
if (GenerateDebugInfo && prologue.Count > 0)
{
newStatements.Add(new BoundSequencePoint(null, null)
{
WasCompilerGenerated = true
});
}
InsertAndFreePrologue(newStatements, prologue);
foreach (var statement in node.Statements)
{
var replacement = (BoundStatement)this.Visit(statement);
if (replacement != null)
{
newStatements.Add(replacement);
}
}
// TODO: we may not need to update if there was nothing to rewrite.
return(node.Update(newLocals.ToImmutableAndFree(), newStatements.ToImmutableAndFree()));
}
public override BoundNode VisitBlock(BoundBlock node)
{
var builder = ArrayBuilder <BoundStatement> .GetInstance();
VisitStatementSubList(builder, node.Statements);
if (!this.Instrument || (node != _rootStatement && (node.WasCompilerGenerated || node.Syntax.Kind() != SyntaxKind.Block)))
{
return(node.Update(node.Locals, node.LocalFunctions, builder.ToImmutableAndFree()));
}
LocalSymbol? synthesizedLocal;
BoundStatement?prologue = _instrumenter.CreateBlockPrologue(node, out synthesizedLocal);
if (prologue != null)
{
builder.Insert(0, prologue);
}
else if (node == _rootStatement && _factory.TopLevelMethod is SynthesizedSimpleProgramEntryPointSymbol entryPoint)
{
builder.Insert(0, _factory.HiddenSequencePoint());
}
BoundStatement?epilogue = _instrumenter.CreateBlockEpilogue(node);
if (epilogue != null)
{
builder.Add(epilogue);
}
return(new BoundBlock(node.Syntax, synthesizedLocal == null ? node.Locals : node.Locals.Add(synthesizedLocal), node.LocalFunctions, builder.ToImmutableAndFree(), node.HasErrors));
}
// insert the implicit "return" statement at the end of the method body
// Normally, we wouldn't bother attaching syntax trees to compiler-generated nodes, but these
// ones are going to have sequence points.
internal static BoundBlock AppendImplicitReturn(BoundBlock body, MethodSymbol method, CSharpSyntaxNode syntax = null)
{
Debug.Assert(body != null);
Debug.Assert(method != null);
if (syntax == null)
{
syntax = body.Syntax;
}
Debug.Assert(body.WasCompilerGenerated || syntax.IsKind(SyntaxKind.Block) || syntax.IsKind(SyntaxKind.ArrowExpressionClause));
BoundStatement ret = method.IsIterator
? (BoundStatement)BoundYieldBreakStatement.Synthesized(syntax)
: BoundReturnStatement.Synthesized(syntax, null);
// Implicitly added return for async method does not need sequence points since lowering would add one.
if (syntax.IsKind(SyntaxKind.Block) && !method.IsAsync)
{
var blockSyntax = (BlockSyntax)syntax;
ret = new BoundSequencePointWithSpan(
blockSyntax,
ret,
blockSyntax.CloseBraceToken.Span)
{
WasCompilerGenerated = true
};
}
return(body.Update(body.Locals, body.Statements.Add(ret)));
}
internal static BoundBlock Rewrite(SourceMethodSymbol sourceMethodSymbol, MethodContractSyntax contract, BoundBlock body, TypeCompilationState compilationState, DiagnosticBag diagsForCurrentMethod)
{
var binder = compilationState.Compilation.GetBinderFactory(sourceMethodSymbol.SyntaxTree)
.GetBinder(body.Syntax);
SyntheticBoundNodeFactory factory = new SyntheticBoundNodeFactory(sourceMethodSymbol, sourceMethodSymbol.SyntaxNode, compilationState, diagsForCurrentMethod);
var contractType = compilationState.Compilation.GetTypeByReflectionType(typeof(System.Diagnostics.Contracts.Contract), diagsForCurrentMethod);
var contractStatements = ArrayBuilder<BoundStatement>.GetInstance(contract.Requires.Count);
foreach (var requires in contract.Requires)
{
var condition = binder.BindExpression(requires.Condition, diagsForCurrentMethod);
var methodCall = factory.StaticCall(contractType, "Requires", condition);
var statement = factory.ExpressionStatement(methodCall);
contractStatements.Add(statement);
}
foreach (var requires in contract.Ensures)
{
var condition = binder.BindExpression(requires.Condition, diagsForCurrentMethod);
var methodCall = factory.StaticCall(contractType, "Ensures", condition);
var statement = factory.ExpressionStatement(methodCall);
contractStatements.Add(statement);
}
return body.Update(body.Locals, body.Statements.InsertRange(0, contractStatements.ToImmutableAndFree()));
}
private static BoundBlock AppendImplicitReturn(
BoundBlock body,
MethodSymbol method,
bool originalBodyNested
)
{
if (originalBodyNested)
{
var statements = body.Statements;
int n = statements.Length;
var builder = ArrayBuilder <BoundStatement> .GetInstance(n);
builder.AddRange(statements, n - 1);
builder.Add(AppendImplicitReturn((BoundBlock)statements[n - 1], method));
return(body.Update(
body.Locals,
ImmutableArray <LocalFunctionSymbol> .Empty,
builder.ToImmutableAndFree()
));
}
else
{
return(AppendImplicitReturn(body, method));
}
}
public override BoundNode VisitBlock(BoundBlock node)
{
if (!this.Instrument || (node != _rootStatement && (node.WasCompilerGenerated || node.Syntax.Kind() != SyntaxKind.Block)))
{
return node.Update(node.Locals, node.LocalFunctions, VisitList(node.Statements));
}
var builder = ArrayBuilder<BoundStatement>.GetInstance();
for (int i = 0; i < node.Statements.Length; i++)
{
var stmt = (BoundStatement)Visit(node.Statements[i]);
if (stmt != null) builder.Add(stmt);
}
LocalSymbol synthesizedLocal;
BoundStatement prologue = _instrumenter.CreateBlockPrologue(node, out synthesizedLocal);
if (prologue != null)
{
builder.Insert(0, prologue);
}
BoundStatement epilogue = _instrumenter.CreateBlockEpilogue(node);
if (epilogue != null)
{
builder.Add(epilogue);
}
return new BoundBlock(node.Syntax, synthesizedLocal == null ? node.Locals : node.Locals.Add(synthesizedLocal), node.LocalFunctions, builder.ToImmutableAndFree(), node.HasErrors);
}
internal static BoundBlock FixCodeBlockProblems(LambdaSymbol lambdaSymbol, Binder lambdaBodyBinder, BoundBlock block, DiagnosticBag diagnostics)
{
// check for a Lambda that returns a USUAL
var usualType = lambdaBodyBinder.Compilation.UsualType();
if (lambdaSymbol.ReturnType != usualType)
{
return(block);
}
// handle 2 problems:
// 1) no statements, then add a return statement
// 2) last statement is a void expression. Then the conversion to USUAL fails
var count = block.Statements.Length;
List <BoundStatement> newlist = new List <BoundStatement>();
if (count == 0)
{
var result = new BoundDefaultExpression(block.Syntax, usualType);
newlist.Add(new BoundReturnStatement(block.Syntax, RefKind.None, result));
block = block.Update(block.Locals, ImmutableArray <LocalFunctionSymbol> .Empty, newlist.ToImmutableArray <BoundStatement>());
}
else
{
var stmt = block.Statements[count - 1];
if (stmt is BoundReturnStatement && stmt.HasErrors)
{
BoundExpression expr = (stmt as BoundReturnStatement).ExpressionOpt;
// when the last expression is a conversion to USUAL
// and there is an error, then this is most likely the conversion from
// a void to USUAL. When that happens, then create an extra stmt in the body of the lambda
// store the return expression in an expression statement
// and return a NIL
if (expr is BoundConversion)
{
var boundConv = expr as BoundConversion;
var operand = boundConv.Operand;
if (boundConv.Type == usualType && operand.Type.SpecialType == SpecialType.System_Void)
{
diagnostics.Clear();
for (int i = 0; i < block.Statements.Length - 1; i++)
{
newlist.Add(block.Statements[i]);
}
newlist.Add(new BoundExpressionStatement(stmt.Syntax, operand));
var result = new BoundDefaultExpression(stmt.Syntax, usualType);
newlist.Add(new BoundReturnStatement(stmt.Syntax, RefKind.None, result));
block = new BoundBlock(block.Syntax, block.Locals, newlist.ToImmutableArray <BoundStatement>());
}
}
}
}
return(block);
}
// insert the implicit "return" statement at the end of the method body
// Normally, we wouldn't bother attaching syntax trees to compiler-generated nodes, but these
// ones are going to have sequence points.
internal static BoundBlock AppendImplicitReturn(BoundBlock body, MethodSymbol method)
{
Debug.Assert(body != null);
Debug.Assert(method != null);
SyntaxNode syntax = body.Syntax;
Debug.Assert(body.WasCompilerGenerated ||
syntax.IsKind(SyntaxKind.Block) ||
syntax.IsKind(SyntaxKind.ArrowExpressionClause) ||
syntax.IsKind(SyntaxKind.ConstructorDeclaration));
BoundStatement ret = (method.IsIterator && !method.IsAsync)
? (BoundStatement)BoundYieldBreakStatement.Synthesized(syntax)
: BoundReturnStatement.Synthesized(syntax, RefKind.None, null);
return(body.Update(body.Locals, body.LocalFunctions, body.Statements.Add(ret)));
}
private static BoundBlock PrependImplicitInitializations(BoundBlock body, MethodSymbol method, ImmutableArray <FieldSymbol> implicitlyInitializedFields, TypeCompilationState compilationState, BindingDiagnosticBag diagnostics)
{
Debug.Assert(method.MethodKind == MethodKind.Constructor);
Debug.Assert(method.ContainingType.IsStructType());
var F = new SyntheticBoundNodeFactory(method, body.Syntax, compilationState, diagnostics);
var builder = ArrayBuilder <BoundStatement> .GetInstance(implicitlyInitializedFields.Length);
foreach (var field in implicitlyInitializedFields)
{
builder.Add(
F.ExpressionStatement(
F.AssignmentExpression(
F.Field(F.This(), field),
F.Default(field.Type))));
}
var initializations = F.HiddenSequencePoint(F.Block(builder.ToImmutableAndFree()));
return(body.Update(body.Locals, body.LocalFunctions, body.Statements.Insert(index: 0, initializations)));
}
public override BoundNode VisitBlock(BoundBlock node)
{
if (node.WasCompilerGenerated || !this.GenerateDebugInfo || node.Syntax.Kind() == SyntaxKind.ArrowExpressionClause)
{
return(node.Update(node.Locals, node.LocalFunctions, VisitList(node.Statements)));
}
BlockSyntax syntax = node.Syntax as BlockSyntax;
var builder = ArrayBuilder <BoundStatement> .GetInstance();
if (syntax != null)
{
var oBspan = syntax.OpenBraceToken.Span;
builder.Add(new BoundSequencePointWithSpan(syntax, null, oBspan));
}
for (int i = 0; i < node.Statements.Length; i++)
{
var stmt = (BoundStatement)Visit(node.Statements[i]);
if (stmt != null)
{
builder.Add(stmt);
}
}
// no need to mark "}" on the outermost block
// as it cannot leave it normally. The block will have "return" at the end.
if (syntax != null && (syntax.Parent == null || !(syntax.Parent.IsAnonymousFunction() || syntax.Parent is BaseMethodDeclarationSyntax)))
{
var cBspan = syntax.CloseBraceToken.Span;
builder.Add(new BoundSequencePointWithSpan(syntax, null, cBspan));
}
return(new BoundBlock(node.Syntax, node.Locals, node.LocalFunctions, builder.ToImmutableAndFree(), node.HasErrors));
}
private static BoundBlock AppendImplicitReturn(BoundBlock body, MethodSymbol method, CSharpSyntaxNode syntax, bool originalBodyNested)
{
if (originalBodyNested)
{
var statements = body.Statements;
int n = statements.Length;
var builder = ArrayBuilder<BoundStatement>.GetInstance(n);
builder.AddRange(statements, n - 1);
builder.Add(AppendImplicitReturn((BoundBlock)statements[n - 1], method, syntax));
return body.Update(body.Locals, ImmutableArray<LocalFunctionSymbol>.Empty, builder.ToImmutableAndFree());
}
else
{
return AppendImplicitReturn(body, method, syntax);
}
}
// insert the implicit "return" statement at the end of the method body
// Normally, we wouldn't bother attaching syntax trees to compiler-generated nodes, but these
// ones are going to have sequence points.
internal static BoundBlock AppendImplicitReturn(BoundBlock body, MethodSymbol method, CSharpSyntaxNode syntax = null)
{
Debug.Assert(body != null);
Debug.Assert(method != null);
if (syntax == null)
{
syntax = body.Syntax;
}
Debug.Assert(body.WasCompilerGenerated || syntax.IsKind(SyntaxKind.Block) || syntax.IsKind(SyntaxKind.ArrowExpressionClause));
BoundStatement ret = method.IsIterator
? (BoundStatement)BoundYieldBreakStatement.Synthesized(syntax)
: BoundReturnStatement.Synthesized(syntax, RefKind.None, null);
return body.Update(body.Locals, body.LocalFunctions, body.Statements.Add(ret));
}
// insert the implicit "return" statement at the end of the method body
// Normally, we wouldn't bother attaching syntax trees to compiler-generated nodes, but these
// ones are going to have sequence points.
internal static BoundBlock AppendImplicitReturn(BoundBlock body, MethodSymbol method, CSharpSyntaxNode syntax = null)
{
Debug.Assert(body != null);
Debug.Assert(method != null);
if (syntax == null)
{
syntax = body.Syntax;
}
Debug.Assert(body.WasCompilerGenerated || syntax.IsKind(SyntaxKind.Block) || syntax.IsKind(SyntaxKind.ArrowExpressionClause));
BoundStatement ret = method.IsIterator
? (BoundStatement)BoundYieldBreakStatement.Synthesized(syntax)
: BoundReturnStatement.Synthesized(syntax, null);
// Implicitly added return for async method does not need sequence points since lowering would add one.
if (syntax.IsKind(SyntaxKind.Block) && !method.IsAsync)
{
var blockSyntax = (BlockSyntax)syntax;
ret = new BoundSequencePointWithSpan(
blockSyntax,
ret,
blockSyntax.CloseBraceToken.Span)
{ WasCompilerGenerated = true };
}
return body.Update(body.Locals, body.Statements.Add(ret));
}