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/*
* Copyright (C) 2015-2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "B3LegalizeMemoryOffsets.h"
#if ENABLE(B3_JIT)
#include "B3InsertionSet.h"
#include "B3MemoryValueInlines.h"
#include "B3PhaseScope.h"
#include "B3ProcedureInlines.h"
#include "B3ValueInlines.h"
namespace JSC { namespace B3 {
namespace {
class LegalizeMemoryOffsets {
public:
LegalizeMemoryOffsets(Procedure& proc)
: m_proc(proc)
, m_insertionSet(proc)
{
}
void run()
{
// FIXME: Perhaps this should be moved to lowerMacros, and quirks mode can impose the requirement
// that the offset is legal. But for now this is sort of OK because we run pureCSE after. Also,
// we should probably have something better than just pureCSE to clean up the code that this
// introduces.
// https://bugs.webkit.org/show_bug.cgi?id=169246
for (BasicBlock* block : m_proc) {
for (unsigned index = 0; index < block->size(); ++index) {
MemoryValue* memoryValue = block->at(index)->as<MemoryValue>();
if (!memoryValue)
continue;
if (!memoryValue->isLegalOffset(memoryValue->offset())) {
Value* base = memoryValue->lastChild();
Value* offsetValue = m_insertionSet.insertIntConstant(index, memoryValue->origin(), pointerType(), memoryValue->offset());
Value* resolvedAddress = m_proc.add<Value>(Add, memoryValue->origin(), base, offsetValue);
m_insertionSet.insertValue(index, resolvedAddress);
memoryValue->lastChild() = resolvedAddress;
memoryValue->setOffset(0);
}
}
m_insertionSet.execute(block);
}
}
Procedure& m_proc;
InsertionSet m_insertionSet;
};
} // anonymous namespace
void legalizeMemoryOffsets(Procedure& proc)
{
PhaseScope phaseScope(proc, "legalizeMemoryOffsets"_s);
LegalizeMemoryOffsets legalizeMemoryOffsets(proc);
legalizeMemoryOffsets.run();
}
} } // namespace JSC::B3
#endif // ENABLE(B3_JIT)
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