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