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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.
*/
#pragma once
#include "CallLinkStatus.h"
#include "CodeOrigin.h"
#include "ConcurrentJSLock.h"
#include "GetByIdVariant.h"
#include "ScopeOffset.h"
namespace JSC {
class AccessCase;
class CodeBlock;
class JSModuleEnvironment;
class JSModuleNamespaceObject;
class ModuleNamespaceAccessCase;
class StructureStubInfo;
typedef HashMap<CodeOrigin, StructureStubInfo*, CodeOriginApproximateHash> StubInfoMap;
class GetByIdStatus {
public:
enum State {
// It's uncached so we have no information.
NoInformation,
// It's cached for a simple access to a known object property with
// a possible structure chain and a possible specific value.
Simple,
// It's cached for a custom accessor with a possible structure chain.
Custom,
// It's cached for an access to a module namespace object's binding.
ModuleNamespace,
// It's known to often take slow path.
TakesSlowPath,
// It's known to take paths that make calls.
MakesCalls,
};
GetByIdStatus()
: m_state(NoInformation)
{
}
explicit GetByIdStatus(State state)
: m_state(state)
{
ASSERT(state == NoInformation || state == TakesSlowPath || state == MakesCalls);
}
GetByIdStatus(
State state, bool wasSeenInJIT, const GetByIdVariant& variant = GetByIdVariant())
: m_state(state)
, m_wasSeenInJIT(wasSeenInJIT)
{
ASSERT((state == Simple || state == Custom) == variant.isSet());
m_variants.append(variant);
}
static GetByIdStatus computeFor(CodeBlock*, StubInfoMap&, unsigned bytecodeIndex, UniquedStringImpl* uid);
static GetByIdStatus computeFor(const StructureSet&, UniquedStringImpl* uid);
static GetByIdStatus computeFor(CodeBlock* baselineBlock, CodeBlock* dfgBlock, StubInfoMap& baselineMap, StubInfoMap& dfgMap, CodeOrigin, UniquedStringImpl* uid);
#if ENABLE(DFG_JIT)
static GetByIdStatus 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 !isSet(); }
bool isSimple() const { return m_state == Simple; }
bool isCustom() const { return m_state == Custom; }
bool isModuleNamespace() const { return m_state == ModuleNamespace; }
size_t numVariants() const { return m_variants.size(); }
const Vector<GetByIdVariant, 1>& variants() const { return m_variants; }
const GetByIdVariant& at(size_t index) const { return m_variants[index]; }
const GetByIdVariant& operator[](size_t index) const { return at(index); }
bool takesSlowPath() const { return m_state == TakesSlowPath || m_state == MakesCalls || m_state == Custom || m_state == ModuleNamespace; }
bool makesCalls() const;
bool wasSeenInJIT() const { return m_wasSeenInJIT; }
// Attempts to reduce the set of variants to fit the given structure set. This may be approximate.
void filter(const StructureSet&);
JSModuleNamespaceObject* moduleNamespaceObject() const { return m_moduleNamespaceObject; }
JSModuleEnvironment* moduleEnvironment() const { return m_moduleEnvironment; }
ScopeOffset scopeOffset() const { return m_scopeOffset; }
void dump(PrintStream&) const;
private:
#if ENABLE(DFG_JIT)
static bool hasExitSite(const ConcurrentJSLocker&, CodeBlock*, unsigned bytecodeIndex);
#endif
#if ENABLE(JIT)
GetByIdStatus(const ModuleNamespaceAccessCase&);
static GetByIdStatus computeForStubInfoWithoutExitSiteFeedback(
const ConcurrentJSLocker&, CodeBlock* profiledBlock, StructureStubInfo*,
UniquedStringImpl* uid, CallLinkStatus::ExitSiteData);
#endif
static GetByIdStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex, UniquedStringImpl* uid);
bool appendVariant(const GetByIdVariant&);
State m_state;
Vector<GetByIdVariant, 1> m_variants;
bool m_wasSeenInJIT;
JSModuleNamespaceObject* m_moduleNamespaceObject { nullptr };
JSModuleEnvironment* m_moduleEnvironment { nullptr };
ScopeOffset m_scopeOffset { };
};
} // namespace JSC
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