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/*
* Copyright (C) 2012, 2013 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.
*/
#ifndef DFGArrayifySlowPathGenerator_h
#define DFGArrayifySlowPathGenerator_h
#include <wtf/Platform.h>
#if ENABLE(DFG_JIT)
#include "DFGArrayMode.h"
#include "DFGCommon.h"
#include "DFGOSRExitJumpPlaceholder.h"
#include "DFGOperations.h"
#include "DFGSlowPathGenerator.h"
#include "DFGSpeculativeJIT.h"
#include <wtf/Vector.h>
namespace JSC { namespace DFG {
class ArrayifySlowPathGenerator : public JumpingSlowPathGenerator<MacroAssembler::JumpList> {
public:
ArrayifySlowPathGenerator(
const MacroAssembler::JumpList& from, SpeculativeJIT* jit, Node* node, GPRReg baseGPR,
GPRReg propertyGPR, GPRReg tempGPR, GPRReg structureGPR)
: JumpingSlowPathGenerator<MacroAssembler::JumpList>(from, jit)
, m_op(node->op())
, m_arrayMode(node->arrayMode())
, m_structure(node->op() == ArrayifyToStructure ? node->structure() : 0)
, m_baseGPR(baseGPR)
, m_propertyGPR(propertyGPR)
, m_tempGPR(tempGPR)
, m_structureGPR(structureGPR)
{
ASSERT(m_op == Arrayify || m_op == ArrayifyToStructure);
jit->silentSpillAllRegistersImpl(false, m_plans, InvalidGPRReg);
if (m_propertyGPR != InvalidGPRReg) {
switch (m_arrayMode.type()) {
case Array::Int32:
case Array::Double:
case Array::Contiguous:
m_badPropertyJump = jit->backwardSpeculationCheck(Uncountable, JSValueRegs(), 0);
break;
default:
break;
}
}
m_badIndexingTypeJump = jit->backwardSpeculationCheck(BadIndexingType, JSValueSource::unboxedCell(m_baseGPR), 0);
}
protected:
void generateInternal(SpeculativeJIT* jit)
{
linkFrom(jit);
ASSERT(m_op == Arrayify || m_op == ArrayifyToStructure);
if (m_propertyGPR != InvalidGPRReg) {
switch (m_arrayMode.type()) {
case Array::Int32:
case Array::Double:
case Array::Contiguous:
m_badPropertyJump.fill(jit, jit->m_jit.branch32(
MacroAssembler::AboveOrEqual, m_propertyGPR,
MacroAssembler::TrustedImm32(MIN_SPARSE_ARRAY_INDEX)));
break;
default:
break;
}
}
for (unsigned i = 0; i < m_plans.size(); ++i)
jit->silentSpill(m_plans[i]);
switch (m_arrayMode.type()) {
case Array::Int32:
jit->callOperation(operationEnsureInt32, m_tempGPR, m_baseGPR);
break;
case Array::Double:
jit->callOperation(operationEnsureDouble, m_tempGPR, m_baseGPR);
break;
case Array::Contiguous:
if (m_arrayMode.conversion() == Array::RageConvert)
jit->callOperation(operationRageEnsureContiguous, m_tempGPR, m_baseGPR);
else
jit->callOperation(operationEnsureContiguous, m_tempGPR, m_baseGPR);
break;
case Array::ArrayStorage:
case Array::SlowPutArrayStorage:
jit->callOperation(operationEnsureArrayStorage, m_tempGPR, m_baseGPR);
break;
default:
CRASH();
break;
}
for (unsigned i = m_plans.size(); i--;)
jit->silentFill(m_plans[i], GPRInfo::regT0);
if (m_op == ArrayifyToStructure) {
ASSERT(m_structure);
m_badIndexingTypeJump.fill(
jit, jit->m_jit.branchWeakPtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(m_baseGPR, JSCell::structureOffset()),
m_structure));
} else {
// Alas, we need to reload the structure because silent spilling does not save
// temporaries. Nor would it be useful for it to do so. Either way we're talking
// about a load.
jit->m_jit.loadPtr(
MacroAssembler::Address(m_baseGPR, JSCell::structureOffset()), m_structureGPR);
// Finally, check that we have the kind of array storage that we wanted to get.
// Note that this is a backwards speculation check, which will result in the
// bytecode operation corresponding to this arrayification being reexecuted.
// That's fine, since arrayification is not user-visible.
jit->m_jit.load8(
MacroAssembler::Address(m_structureGPR, Structure::indexingTypeOffset()), m_structureGPR);
m_badIndexingTypeJump.fill(
jit, jit->jumpSlowForUnwantedArrayMode(m_structureGPR, m_arrayMode));
}
jumpTo(jit);
}
private:
NodeType m_op;
ArrayMode m_arrayMode;
Structure* m_structure;
GPRReg m_baseGPR;
GPRReg m_propertyGPR;
GPRReg m_tempGPR;
GPRReg m_structureGPR;
OSRExitJumpPlaceholder m_badPropertyJump;
OSRExitJumpPlaceholder m_badIndexingTypeJump;
Vector<SilentRegisterSavePlan, 2> m_plans;
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
#endif // DFGArrayifySlowPathGenerator_h
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