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344ecfd3f9
The spelling of the 'fail' statement is simply 'return nil', but distinguishing it in the AST clarifies intent for SILGen. Swift SVN r21310
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
//===--- StmtNodes.def - Swift Statement AST Metaprogramming ----*- 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 - 2015 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 http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines macros used for macro-metaprogramming with statements.
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//
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//===----------------------------------------------------------------------===//
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/// STMT(Id, Parent)
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/// If the statement node is not abstract, its enumerator value is
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/// StmtKind::Id. The node's class name is Id##Stmt, and the name of
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/// its base class (in the Stmt hierarchy) is Parent.
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/// An abstract statement node is an abstract base class in the hierarchy;
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/// it is never a most-derived type, and it does not have an enumerator in
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/// StmtKind.
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///
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/// Most metaprograms do not care about abstract statements, so the default
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/// is to ignore them.
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#ifndef ABSTRACT_STMT
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#define ABSTRACT_STMT(Id, Parent)
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#endif
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/// A convenience for determining the range of statements. These will always
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/// appear immediately after the last member.
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#ifndef STMT_RANGE
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#define STMT_RANGE(Id, First, Last)
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#endif
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STMT(Brace, Stmt)
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STMT(Return, Stmt)
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STMT(If, Stmt)
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ABSTRACT_STMT(Labeled, Stmt)
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STMT(While, Stmt)
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STMT(DoWhile, Stmt)
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STMT(For, Stmt)
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STMT(ForEach, Stmt)
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STMT(Switch, Stmt)
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STMT_RANGE(Labeled, While, Switch)
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STMT(Case, Stmt)
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STMT(Break, Stmt)
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STMT(Continue, Stmt)
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STMT(Fallthrough, Stmt)
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STMT(IfConfig, Stmt)
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STMT(Fail, Stmt)
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#undef STMT_RANGE
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#undef ABSTRACT_STMT
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#undef STMT
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