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/*
* Copyright (C) 2012, 2013, 2014 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 PutByIdStatus_h
#define PutByIdStatus_h
#include "CallLinkStatus.h"
#include "ExitingJITType.h"
#include "PutByIdVariant.h"
#include "StructureStubInfo.h"
#include <wtf/text/StringImpl.h>
namespace JSC {
class CodeBlock;
class VM;
class JSGlobalObject;
class Structure;
class StructureChain;
class PutByIdStatus {
public:
enum State {
// It's uncached so we have no information.
NoInformation,
// It's cached as a simple store of some kind.
Simple,
// It's known to often take slow path.
TakesSlowPath,
// It's known to take paths that make calls.
MakesCalls
};
PutByIdStatus()
: m_state(NoInformation)
{
}
explicit PutByIdStatus(State state)
: m_state(state)
{
ASSERT(m_state == NoInformation || m_state == TakesSlowPath || m_state == MakesCalls);
}
PutByIdStatus(const PutByIdVariant& variant)
: m_state(Simple)
{
m_variants.append(variant);
}
static PutByIdStatus computeFor(CodeBlock*, StubInfoMap&, unsigned bytecodeIndex, UniquedStringImpl* uid);
static PutByIdStatus computeFor(JSGlobalObject*, const StructureSet&, UniquedStringImpl* uid, bool isDirect);
static PutByIdStatus computeFor(CodeBlock* baselineBlock, CodeBlock* dfgBlock, StubInfoMap& baselineMap, StubInfoMap& dfgMap, CodeOrigin, UniquedStringImpl* uid);
#if ENABLE(JIT)
static PutByIdStatus computeForStubInfo(const ConcurrentJITLocker&, CodeBlock* baselineBlock, StructureStubInfo*, CodeOrigin, UniquedStringImpl* uid);
#endif
State state() const { return m_state; }
bool isSet() const { return m_state != NoInformation; }
bool operator!() const { return m_state == NoInformation; }
bool isSimple() const { return m_state == Simple; }
bool takesSlowPath() const { return m_state == TakesSlowPath || m_state == MakesCalls; }
bool makesCalls() const;
size_t numVariants() const { return m_variants.size(); }
const Vector<PutByIdVariant, 1>& variants() const { return m_variants; }
const PutByIdVariant& at(size_t index) const { return m_variants[index]; }
const PutByIdVariant& operator[](size_t index) const { return at(index); }
void dump(PrintStream&) const;
private:
#if ENABLE(DFG_JIT)
static bool hasExitSite(const ConcurrentJITLocker&, CodeBlock*, unsigned bytecodeIndex);
#endif
#if ENABLE(JIT)
static PutByIdStatus computeForStubInfo(
const ConcurrentJITLocker&, CodeBlock*, StructureStubInfo*, UniquedStringImpl* uid,
CallLinkStatus::ExitSiteData);
#endif
static PutByIdStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex, UniquedStringImpl* uid);
bool appendVariant(const PutByIdVariant&);
State m_state;
Vector<PutByIdVariant, 1> m_variants;
};
} // namespace JSC
#endif // PutByIdStatus_h
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