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90 lines
3.5 KiB
90 lines
3.5 KiB
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_JUMP_TARGET_H_
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#define V8_JUMP_TARGET_H_
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#if V8_TARGET_ARCH_IA32
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#include "jump-target-heavy.h"
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#elif V8_TARGET_ARCH_X64
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#include "jump-target-heavy.h"
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#elif V8_TARGET_ARCH_ARM
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#include "jump-target-light.h"
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#elif V8_TARGET_ARCH_MIPS
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#include "jump-target-light.h"
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#else
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#error Unsupported target architecture.
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#endif
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namespace v8 {
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namespace internal {
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// -------------------------------------------------------------------------
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// Shadow break targets
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//
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// A shadow break target represents a break target that is temporarily
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// shadowed by another one (represented by the original during
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// shadowing). They are used to catch jumps to labels in certain
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// contexts, e.g. try blocks. After shadowing ends, the formerly
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// shadowed target is again represented by the original and the
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// ShadowTarget can be used as a jump target in its own right,
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// representing the formerly shadowing target.
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class ShadowTarget : public BreakTarget {
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public:
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// Construct a shadow jump target. After construction the shadow
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// target object holds the state of the original target, and the
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// original target is actually a fresh one that intercepts control
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// flow intended for the shadowed one.
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explicit ShadowTarget(BreakTarget* shadowed);
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virtual ~ShadowTarget() {}
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// End shadowing. After shadowing ends, the original jump target
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// again gives access to the formerly shadowed target and the shadow
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// target object gives access to the formerly shadowing target.
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void StopShadowing();
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// During shadowing, the currently shadowing target. After
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// shadowing, the target that was shadowed.
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BreakTarget* other_target() const { return other_target_; }
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private:
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// During shadowing, the currently shadowing target. After
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// shadowing, the target that was shadowed.
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BreakTarget* other_target_;
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#ifdef DEBUG
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bool is_shadowing_;
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#endif
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DISALLOW_COPY_AND_ASSIGN(ShadowTarget);
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};
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} } // namespace v8::internal
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#endif // V8_JUMP_TARGET_H_
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