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During the review of SE-0413, typed throws, the notion of a `do throws` syntax for `do..catch` blocks came up. Implement that syntax and semantics, as a way to explicitly specify the type of error that is thrown from the `do` body in `do..catch` statement.
44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
//===--- CatchNode.h - An AST node that catches errors -----------*- C++-*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_AST_CATCHNODE_H
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#define SWIFT_AST_CATCHNODE_H
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/Expr.h"
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#include "swift/AST/Stmt.h"
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namespace swift {
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/// An AST node that represents a point where a thrown error can be caught and
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/// or rethrown, which includes functions do...catch statements.
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class CatchNode: public llvm::PointerUnion<
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AbstractFunctionDecl *, AbstractClosureExpr *, DoCatchStmt *
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> {
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public:
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using PointerUnion::PointerUnion;
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/// Determine the thrown error type within the region of this catch node
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/// where it will catch (and possibly rethrow) errors. All of the errors
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/// thrown from within that region will be converted to this error type.
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///
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/// Returns the thrown error type for a throwing context, or \c llvm::None
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/// if this is a non-throwing context.
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llvm::Optional<Type> getThrownErrorTypeInContext(DeclContext *dc) const;
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};
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} // end namespace swift
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#endif // SWIFT_AST_CATCHNODE_H
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