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#pragma once
27
28#if ENABLE(DFG_JIT)
29
30#include "SpeculatedType.h"
31
32namespace JSC { namespace DFG {
33
34class Graph;
35
36// Propagate predictions gathered at heap load sites by the value profiler, and
37// from slow path executions, to generate a prediction for each node in the graph.
38// This is a crucial phase of compilation, since before running this phase, we
39// have no idea what types any node (or most variables) could possibly have, unless
40// that node is either a heap load, a call, a GetLocal for an argument, or an
41// arithmetic op that had definitely taken slow path. Most nodes (even most
42// arithmetic nodes) do not qualify for any of these categories. But after running
43// this phase, we'll have full information for the expected type of each node.
44
45bool performPredictionPropagation(Graph&);
46
47// Helper used for FixupPhase for computing the predicted type of a ToPrimitive.
48SpeculatedType resultOfToPrimitive(SpeculatedType);
49
50} } // namespace JSC::DFG::Phase
51
52#endif // ENABLE(DFG_JIT)
53