mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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156 lines
6.1 KiB
C++
156 lines
6.1 KiB
C++
/*
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* Copyright (C) 2012-2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "CacheableIdentifier.h"
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#include "CallLinkStatus.h"
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#include "CodeOrigin.h"
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#include "ConcurrentJSLock.h"
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#include "ExitFlag.h"
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#include "GetByIdVariant.h"
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#include "ICStatusMap.h"
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#include "ScopeOffset.h"
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#include "StubInfoSummary.h"
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namespace JSC {
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class AccessCase;
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class CodeBlock;
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class JSModuleEnvironment;
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class JSModuleNamespaceObject;
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class ModuleNamespaceAccessCase;
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class StructureStubInfo;
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class GetByStatus final {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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enum State : uint8_t {
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// It's uncached so we have no information.
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NoInformation,
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// It's cached for a simple access to a known object property with
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// a possible structure chain and a possible specific value.
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Simple,
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// It's cached for a custom accessor with a possible structure chain.
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Custom,
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// It's cached for an access to a module namespace object's binding.
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ModuleNamespace,
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// It will likely take the slow path.
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LikelyTakesSlowPath,
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// It's known to take slow path. We also observed that the slow path was taken on StructureStubInfo.
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ObservedTakesSlowPath,
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// It will likely take the slow path and will make calls.
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MakesCalls,
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// It known to take paths that make calls. We also observed that the slow path was taken on StructureStubInfo.
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ObservedSlowPathAndMakesCalls ,
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};
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GetByStatus()
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: m_state(NoInformation)
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{
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}
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explicit GetByStatus(State state)
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: m_state(state)
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{
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ASSERT(state == NoInformation || state == LikelyTakesSlowPath || state == ObservedTakesSlowPath || state == MakesCalls || state == ObservedSlowPathAndMakesCalls);
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}
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explicit GetByStatus(StubInfoSummary, StructureStubInfo&);
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GetByStatus(
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State state, bool wasSeenInJIT)
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: m_state(state)
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, m_wasSeenInJIT(wasSeenInJIT)
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{
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}
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static GetByStatus computeFor(CodeBlock* baselineBlock, ICStatusMap& baselineMap, ICStatusContextStack& dfgContextStack, CodeOrigin);
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static GetByStatus computeFor(const StructureSet&, UniquedStringImpl*);
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State state() const { return m_state; }
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bool isSet() const { return m_state != NoInformation; }
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explicit operator bool() const { return isSet(); }
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bool isSimple() const { return m_state == Simple; }
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bool isCustom() const { return m_state == Custom; }
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bool isModuleNamespace() const { return m_state == ModuleNamespace; }
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size_t numVariants() const { return m_variants.size(); }
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const Vector<GetByIdVariant, 1>& variants() const { return m_variants; }
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const GetByIdVariant& at(size_t index) const { return m_variants[index]; }
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const GetByIdVariant& operator[](size_t index) const { return at(index); }
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bool takesSlowPath() const { return m_state == LikelyTakesSlowPath || m_state == ObservedTakesSlowPath || m_state == MakesCalls || m_state == ObservedSlowPathAndMakesCalls || m_state == Custom || m_state == ModuleNamespace; }
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bool observedStructureStubInfoSlowPath() const { return m_state == ObservedTakesSlowPath || m_state == ObservedSlowPathAndMakesCalls; }
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bool makesCalls() const;
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GetByStatus slowVersion() const;
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bool wasSeenInJIT() const { return m_wasSeenInJIT; }
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// Attempts to reduce the set of variants to fit the given structure set. This may be approximate.
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void filter(const StructureSet&);
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JSModuleNamespaceObject* moduleNamespaceObject() const { return m_moduleNamespaceData->m_moduleNamespaceObject; }
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JSModuleEnvironment* moduleEnvironment() const { return m_moduleNamespaceData->m_moduleEnvironment; }
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ScopeOffset scopeOffset() const { return m_moduleNamespaceData->m_scopeOffset; }
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void visitAggregate(SlotVisitor&);
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void markIfCheap(SlotVisitor&);
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bool finalize(VM&); // Return true if this gets to live.
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bool appendVariant(const GetByIdVariant&);
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void dump(PrintStream&) const;
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CacheableIdentifier singleIdentifier() const;
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private:
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void merge(const GetByStatus&);
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#if ENABLE(JIT)
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GetByStatus(const ModuleNamespaceAccessCase&);
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static GetByStatus computeForStubInfoWithoutExitSiteFeedback(
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const ConcurrentJSLocker&, CodeBlock* profiledBlock, StructureStubInfo*, CallLinkStatus::ExitSiteData);
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#endif
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static GetByStatus computeFromLLInt(CodeBlock*, BytecodeIndex);
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static GetByStatus computeFor(CodeBlock*, ICStatusMap&, BytecodeIndex, ExitFlag, CallLinkStatus::ExitSiteData);
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struct ModuleNamespaceData {
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JSModuleNamespaceObject* m_moduleNamespaceObject { nullptr };
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JSModuleEnvironment* m_moduleEnvironment { nullptr };
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ScopeOffset m_scopeOffset { };
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CacheableIdentifier m_identifier;
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};
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Vector<GetByIdVariant, 1> m_variants;
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Box<ModuleNamespaceData> m_moduleNamespaceData;
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State m_state;
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bool m_wasSeenInJIT { false };
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};
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} // namespace JSC
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