/* * Copyright (C) 2015 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 DFGLiveCatchVariablePreservationPhase_h #define DFGLiveCatchVariablePreservationPhase_h #if ENABLE(DFG_JIT) namespace JSC { namespace DFG { class Graph; // This phase ensures that we maintain liveness for locals // that are live in the "catch" block. Because a "catch" // block will not be in the control flow graph, we need to ensure // anything live inside the "catch" block in bytecode will maintain // liveness inside the "try" block for an OSR exit from the "try" // block into the "catch" block in the case of an exception being thrown. // // The mechanism currently used to demonstrate liveness to OSR exit // is ensuring all variables live in a "catch" are flushed to the // stack inside the "try" block. bool performLiveCatchVariablePreservationPhase(Graph&); } } // namespace JSC::DFG #endif // ENABLE(DFG_JIT) #endif // DFGLiveCatchVariablePreservationPhase_h