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/*
* Copyright (C) 2012-2018 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.
*/
#pragma once
#include "CallLinkStatus.h"
#include "ExitFlag.h"
#include "ICStatusMap.h"
#include "PutByIdVariant.h"
#include "StubInfoSummary.h"
namespace JSC {
class CodeBlock;
class VM;
class JSGlobalObject;
class Structure;
class StructureChain;
class StructureStubInfo;
typedef HashMap<CodeOrigin, StructureStubInfo*, CodeOriginApproximateHash> StubInfoMap;
class PutByIdStatus final {
WTF_MAKE_FAST_ALLOCATED;
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);
}
explicit PutByIdStatus(StubInfoSummary summary)
{
switch (summary) {
case StubInfoSummary::NoInformation:
m_state = NoInformation;
return;
case StubInfoSummary::Simple:
case StubInfoSummary::MakesCalls:
RELEASE_ASSERT_NOT_REACHED();
return;
case StubInfoSummary::TakesSlowPath:
m_state = TakesSlowPath;
return;
case StubInfoSummary::TakesSlowPathAndMakesCalls:
m_state = MakesCalls;
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
PutByIdStatus(const PutByIdVariant& variant)
: m_state(Simple)
{
m_variants.append(variant);
}
static PutByIdStatus computeFor(CodeBlock*, ICStatusMap&, BytecodeIndex, UniquedStringImpl* uid, ExitFlag, CallLinkStatus::ExitSiteData);
static PutByIdStatus computeFor(JSGlobalObject*, const StructureSet&, UniquedStringImpl* uid, bool isDirect);
static PutByIdStatus computeFor(CodeBlock* baselineBlock, ICStatusMap& baselineMap, ICStatusContextStack& contextStack, CodeOrigin, UniquedStringImpl* uid);
#if ENABLE(JIT)
static PutByIdStatus computeForStubInfo(const ConcurrentJSLocker&, 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;
PutByIdStatus slowVersion() 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 markIfCheap(SlotVisitor&);
bool finalize(VM&);
void merge(const PutByIdStatus&);
void filter(const StructureSet&);
void dump(PrintStream&) const;
private:
#if ENABLE(JIT)
static PutByIdStatus computeForStubInfo(
const ConcurrentJSLocker&, CodeBlock*, StructureStubInfo*, UniquedStringImpl* uid,
CallLinkStatus::ExitSiteData);
#endif
static PutByIdStatus computeFromLLInt(CodeBlock*, BytecodeIndex, UniquedStringImpl* uid);
bool appendVariant(const PutByIdVariant&);
State m_state;
Vector<PutByIdVariant, 1> m_variants;
};
} // namespace JSC