/* * Copyright (C) 2013 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 DFGLoopPreHeaderCreationPhase_h #define DFGLoopPreHeaderCreationPhase_h #if ENABLE(DFG_JIT) namespace JSC { namespace DFG { class BlockInsertionSet; class Graph; struct BasicBlock; // Inserts dummy basic blocks before any loop headers that don't already have // a single non-loop predecessor. bool performLoopPreHeaderCreation(Graph&); // Creates a new basic block (a pre-header) that jumps to the given block. All // predecessors of the given block that aren't dominated by it are rerouted to // the pre-header. // // This function is used internally and it's used in a surgical fashion by // OSREntrypointCreationPhase. // // Note that executing this function requires having an intact dominators // analysis. You should run that analysis before doing damage to the CFG, even // if said damage is done before you call this. BasicBlock* createPreHeader(Graph&, BlockInsertionSet&, BasicBlock*); } } // namespace JSC::DFG #endif // ENABLE(DFG_JIT) #endif // DFGLoopPreHeaderCreationPhase_h