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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.PooledObjects;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp
{
internal sealed class CatchClauseBinder : LocalScopeBinder
{
private readonly CatchClauseSyntax _syntax;
public CatchClauseBinder(Binder enclosing, CatchClauseSyntax syntax)
: base(enclosing, (enclosing.Flags | BinderFlags.InCatchBlock) & ~BinderFlags.InNestedFinallyBlock)
{
Debug.Assert(syntax != null);
_syntax = syntax;
}
protected override ImmutableArray<LocalSymbol> BuildLocals()
{
var locals = ArrayBuilder<LocalSymbol>.GetInstance();
var declarationOpt = _syntax.Declaration;
if ((declarationOpt != null) && (declarationOpt.Identifier.Kind() != SyntaxKind.None))
{
locals.Add(SourceLocalSymbol.MakeLocal(this.ContainingMemberOrLambda, this, allowRefKind: false, allowScoped: false, declarationOpt.Type, declarationOpt.Identifier, LocalDeclarationKind.CatchVariable, initializer: null));
}
if (_syntax.Filter != null)
{
ExpressionVariableFinder.FindExpressionVariables(this, locals, _syntax.Filter.FilterExpression);
}
return locals.ToImmutableAndFree();
}
internal override ImmutableArray<LocalSymbol> GetDeclaredLocalsForScope(SyntaxNode scopeDesignator)
{
if (_syntax == scopeDesignator)
{
return this.Locals;
}
throw ExceptionUtilities.Unreachable();
}
internal override ImmutableArray<LocalFunctionSymbol> GetDeclaredLocalFunctionsForScope(CSharpSyntaxNode scopeDesignator)
{
throw ExceptionUtilities.Unreachable();
}
internal override SyntaxNode ScopeDesignator
{
get
{
return _syntax;
}
}
}
}
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