1/*
2 * Copyright (C) 2015-2017 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#include "config.h"
27#include "B3LegalizeMemoryOffsets.h"
28
29#if ENABLE(B3_JIT)
30
31#include "B3InsertionSetInlines.h"
32#include "B3MemoryValueInlines.h"
33#include "B3PhaseScope.h"
34#include "B3ProcedureInlines.h"
35#include "B3ValueInlines.h"
36
37namespace JSC { namespace B3 {
38
39namespace {
40
41class LegalizeMemoryOffsets {
42public:
43 LegalizeMemoryOffsets(Procedure& proc)
44 : m_proc(proc)
45 , m_insertionSet(proc)
46 {
47 }
48
49 void run()
50 {
51 // FIXME: Perhaps this should be moved to lowerMacros, and quirks mode can impose the requirement
52 // that the offset is legal. But for now this is sort of OK because we run pureCSE after. Also,
53 // we should probably have something better than just pureCSE to clean up the code that this
54 // introduces.
55 // https://bugs.webkit.org/show_bug.cgi?id=169246
56
57 for (BasicBlock* block : m_proc) {
58 for (unsigned index = 0; index < block->size(); ++index) {
59 MemoryValue* memoryValue = block->at(index)->as<MemoryValue>();
60 if (!memoryValue)
61 continue;
62
63 if (!memoryValue->isLegalOffset(memoryValue->offset())) {
64 Value* base = memoryValue->lastChild();
65 Value* offsetValue = m_insertionSet.insertIntConstant(index, memoryValue->origin(), pointerType(), memoryValue->offset());
66 Value* resolvedAddress = m_proc.add<Value>(Add, memoryValue->origin(), base, offsetValue);
67 m_insertionSet.insertValue(index, resolvedAddress);
68
69 memoryValue->lastChild() = resolvedAddress;
70 memoryValue->setOffset(0);
71 }
72 }
73 m_insertionSet.execute(block);
74 }
75 }
76
77 Procedure& m_proc;
78 InsertionSet m_insertionSet;
79};
80
81} // anonymous namespace
82
83void legalizeMemoryOffsets(Procedure& proc)
84{
85 PhaseScope phaseScope(proc, "legalizeMemoryOffsets");
86 LegalizeMemoryOffsets legalizeMemoryOffsets(proc);
87 legalizeMemoryOffsets.run();
88}
89
90} } // namespace JSC::B3
91
92#endif // ENABLE(B3_JIT)
93
94