1/* 2 * Copyright (C) 2011 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef DFGPredictionPropagationPhase_h 27#define DFGPredictionPropagationPhase_h 28 29#if ENABLE(DFG_JIT) 30 31#include "SpeculatedType.h" 32 33namespace JSC { namespace DFG { 34 35class Graph; 36 37// Propagate predictions gathered at heap load sites by the value profiler, and 38// from slow path executions, to generate a prediction for each node in the graph. 39// This is a crucial phase of compilation, since before running this phase, we 40// have no idea what types any node (or most variables) could possibly have, unless 41// that node is either a heap load, a call, a GetLocal for an argument, or an 42// arithmetic op that had definitely taken slow path. Most nodes (even most 43// arithmetic nodes) do not qualify for any of these categories. But after running 44// this phase, we'll have full information for the expected type of each node. 45 46bool performPredictionPropagation(Graph&); 47 48// Helper used for FixupPhase for computing the predicted type of a ToPrimitive. 49SpeculatedType resultOfToPrimitive(SpeculatedType); 50 51} } // namespace JSC::DFG::Phase 52 53#endif // ENABLE(DFG_JIT) 54 55#endif // DFGPredictionPropagationPhase_h 56