1/*
2 * Copyright (C) 2011-2018 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#include "DFGAbstractValue.h"
29#include "DFGFlushFormat.h"
30#include "MacroAssemblerCodeRef.h"
31#include "Operands.h"
32#include <wtf/BitVector.h>
33
34namespace JSC {
35
36class ExecState;
37class CodeBlock;
38
39namespace DFG {
40
41#if ENABLE(DFG_JIT)
42struct OSREntryReshuffling {
43 OSREntryReshuffling() { }
44
45 OSREntryReshuffling(int fromOffset, int toOffset)
46 : fromOffset(fromOffset)
47 , toOffset(toOffset)
48 {
49 }
50
51 int fromOffset;
52 int toOffset;
53};
54
55struct OSREntryData {
56 unsigned m_bytecodeIndex;
57 CodeLocationLabel<OSREntryPtrTag> m_machineCode;
58 Operands<AbstractValue> m_expectedValues;
59 // Use bitvectors here because they tend to only require one word.
60 BitVector m_localsForcedDouble;
61 BitVector m_localsForcedAnyInt;
62 Vector<OSREntryReshuffling> m_reshufflings;
63 BitVector m_machineStackUsed;
64
65 void dumpInContext(PrintStream&, DumpContext*) const;
66 void dump(PrintStream&) const;
67};
68
69inline unsigned getOSREntryDataBytecodeIndex(OSREntryData* osrEntryData)
70{
71 return osrEntryData->m_bytecodeIndex;
72}
73
74struct CatchEntrypointData {
75 // We use this when doing OSR entry at catch. We prove the arguments
76 // are of the expected type before entering at a catch block.
77 MacroAssemblerCodePtr<ExceptionHandlerPtrTag> machineCode;
78 Vector<FlushFormat> argumentFormats;
79 unsigned bytecodeIndex;
80};
81
82// Returns a pointer to a data buffer that the OSR entry thunk will recognize and
83// parse. If this returns null, it means
84void* prepareOSREntry(ExecState*, CodeBlock*, unsigned bytecodeIndex);
85
86// If null is returned, we can't OSR enter. If it's not null, it's the PC to jump to.
87MacroAssemblerCodePtr<ExceptionHandlerPtrTag> prepareCatchOSREntry(ExecState*, CodeBlock*, unsigned bytecodeIndex);
88#else
89inline MacroAssemblerCodePtr<ExceptionHandlerPtrTag> prepareOSREntry(ExecState*, CodeBlock*, unsigned) { return nullptr; }
90#endif
91
92} } // namespace JSC::DFG
93