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f1315f8b5c
weak copies for capture list variables. Other wise two variables with identical names will end up in the same scope. This fixes a crash in the compiler. rdar://problem/24150188 SR-526
112 lines
3.2 KiB
C++
112 lines
3.2 KiB
C++
//===--- Scope.h - Declarations for scope RAII objects ----------*- 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 - 2016 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 the Scope and FullExpr RAII objects.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SCOPE_H
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#define SCOPE_H
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#include "SILGenFunction.h"
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#include "swift/SIL/SILDebugScope.h"
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#include "Cleanup.h"
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namespace swift {
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namespace Lowering {
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/// A Scope is a RAII object recording that a scope (e.g. a brace
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/// statement) has been entered.
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class LLVM_LIBRARY_VISIBILITY Scope {
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CleanupManager &Cleanups;
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CleanupsDepth Depth;
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CleanupsDepth SavedInnermostScope;
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CleanupLocation Loc;
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void popImpl() {
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Cleanups.Stack.checkIterator(Depth);
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Cleanups.Stack.checkIterator(Cleanups.InnermostScope);
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assert(Cleanups.InnermostScope == Depth && "popping scopes out of order");
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Cleanups.InnermostScope = SavedInnermostScope;
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Cleanups.endScope(Depth, Loc);
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Cleanups.Stack.checkIterator(Cleanups.InnermostScope);
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Cleanups.popTopDeadCleanups(Cleanups.InnermostScope);
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}
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public:
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explicit Scope(CleanupManager &Cleanups, CleanupLocation L)
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: Cleanups(Cleanups), Depth(Cleanups.getCleanupsDepth()),
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SavedInnermostScope(Cleanups.InnermostScope),
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Loc(L) {
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assert(Depth.isValid());
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Cleanups.Stack.checkIterator(Cleanups.InnermostScope);
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Cleanups.InnermostScope = Depth;
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}
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void pop() {
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assert(Depth.isValid() && "popping a scope twice!");
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popImpl();
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Depth = CleanupsDepth::invalid();
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}
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~Scope() {
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if (Depth.isValid()) popImpl();
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}
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};
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/// A FullExpr is a RAII object recording that a full-expression has
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/// been entered. A full-expression is essentially a very small scope
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/// for the temporaries in an expression, with the added complexity
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/// that (eventually, very likely) we have to deal with expressions
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/// that are only conditionally evaluated.
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class LLVM_LIBRARY_VISIBILITY FullExpr : private Scope {
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public:
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explicit FullExpr(CleanupManager &Cleanups, CleanupLocation Loc)
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: Scope(Cleanups, Loc) {}
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using Scope::pop;
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};
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/// A LexicalScope is a Scope that is also exposed to the debug info.
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class LLVM_LIBRARY_VISIBILITY LexicalScope : private Scope {
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SILGenFunction& SGF;
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public:
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explicit LexicalScope(CleanupManager &Cleanups,
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SILGenFunction& SGF,
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CleanupLocation Loc)
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: Scope(Cleanups, Loc), SGF(SGF) {
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SGF.enterDebugScope(Loc);
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}
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using Scope::pop;
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~LexicalScope() {
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SGF.leaveDebugScope();
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}
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};
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/// A scope that only exists in the debug info.
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class LLVM_LIBRARY_VISIBILITY DebugScope {
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SILGenFunction &SGF;
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public:
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explicit DebugScope(SILGenFunction &SGF, CleanupLocation Loc) : SGF(SGF) {
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SGF.enterDebugScope(Loc);
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}
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~DebugScope() { SGF.leaveDebugScope(); }
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};
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} // end namespace Lowering
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} // end namespace swift
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#endif
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