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6ee44f09b4
These allow multi-statement `if`/`switch` expression branches that can produce a value at the end by saying `then <expr>`. This is gated behind `-enable-experimental-feature ThenStatements` pending evolution discussion.
79 lines
2.4 KiB
C++
79 lines
2.4 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 - 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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//
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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 subclass of LabeledStmt. Forwards to STMT by default.
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#ifndef LABELED_STMT
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#define LABELED_STMT(Id, Parent) 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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#ifndef LAST_STMT
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#define LAST_STMT(Id)
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#endif
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STMT(Brace, Stmt)
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STMT(Return, Stmt)
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STMT(Then, Stmt)
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STMT(Yield, Stmt)
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STMT(Defer, Stmt)
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ABSTRACT_STMT(Labeled, Stmt)
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ABSTRACT_STMT(LabeledConditional, LabeledStmt)
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LABELED_STMT(If, LabeledConditionalStmt)
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LABELED_STMT(Guard, LabeledConditionalStmt)
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LABELED_STMT(While, LabeledConditionalStmt)
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STMT_RANGE(LabeledConditional, If, While)
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LABELED_STMT(Do, LabeledStmt)
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LABELED_STMT(DoCatch, LabeledStmt)
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LABELED_STMT(RepeatWhile, LabeledStmt)
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LABELED_STMT(ForEach, LabeledStmt)
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LABELED_STMT(Switch, LabeledStmt)
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STMT_RANGE(Labeled, If, 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(Fail, Stmt)
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STMT(Throw, Stmt)
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STMT(Discard, Stmt)
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STMT(PoundAssert, Stmt)
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LAST_STMT(PoundAssert)
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#undef STMT_RANGE
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#undef LABELED_STMT
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#undef ABSTRACT_STMT
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#undef STMT
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#undef LAST_STMT
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