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