1/*
2 * Copyright (C) 2015-2016 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(B3_JIT)
29
30#include "B3StackmapSpecial.h"
31
32namespace JSC { namespace B3 {
33
34// This is a special that recognizes that there are two uses of Patchpoint: Void and and non-Void.
35// In the Void case, the syntax of the Air Patch instruction is:
36//
37// Patch &patchpoint, args...
38//
39// Where "args..." are the lowered arguments to the Patchpoint instruction. In the non-Void case
40// we will have:
41//
42// Patch &patchpoint, result, args...
43
44class PatchpointSpecial : public StackmapSpecial {
45public:
46 JS_EXPORT_PRIVATE PatchpointSpecial();
47 virtual ~PatchpointSpecial();
48
49protected:
50 void forEachArg(Air::Inst&, const ScopedLambda<Air::Inst::EachArgCallback>&) final;
51 bool isValid(Air::Inst&) final;
52 bool admitsStack(Air::Inst&, unsigned argIndex) final;
53 bool admitsExtendedOffsetAddr(Air::Inst&, unsigned) final;
54
55 // NOTE: the generate method will generate the hidden branch and then register a LatePath that
56 // generates the stackmap. Super crazy dude!
57
58 CCallHelpers::Jump generate(Air::Inst&, CCallHelpers&, Air::GenerationContext&) final;
59
60 bool isTerminal(Air::Inst&) final;
61
62 void dumpImpl(PrintStream&) const final;
63 void deepDumpImpl(PrintStream&) const final;
64};
65
66} } // namespace JSC::B3
67
68#endif // ENABLE(B3_JIT)
69