WebKit/Source/JavaScriptCore/jit/JITCode.h at main · WebKit/WebKit · GitHub

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* 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 <JavaScriptCore/ArityCheckMode.h>

#include <JavaScriptCore/CallFrame.h>

#include <JavaScriptCore/CodeOrigin.h>

#include <JavaScriptCore/Intrinsic.h>

#include <JavaScriptCore/JSCJSValue.h>

#include <JavaScriptCore/MacroAssemblerCodeRef.h>

#include <JavaScriptCore/RegisterAtOffsetList.h>

#include <JavaScriptCore/RegisterSet.h>

namespace JSC {

class PCToCodeOriginMap;

namespace DFG {

class CommonData;

class JITCode;

}

namespace FTL {

class ForOSREntryJITCode;

class JITCode;

}

namespace DOMJIT {

class Signature;

}

class TrackedReferences;

class VM;

struct PropertyInlineCacheIndex {

explicit PropertyInlineCacheIndex(unsigned index)

: m_index(index)

{ }

unsigned m_index { 0 };

};

enum class JITType : uint8_t {

None = 0b000,

HostCallThunk = 0b001,

InterpreterThunk = 0b010,

BaselineJIT = 0b011,

DFGJIT = 0b100,

FTLJIT = 0b101,

};

static constexpr unsigned widthOfJITType = 3;

static_assert(WTF::getMSBSet(static_cast<std::underlying_type_t<JITType>>(JITType::FTLJIT)) + 1 == widthOfJITType);

#if ENABLE(JIT)

template<typename ByteSizedEnumType>

class JITConstant {

static_assert(sizeof(ByteSizedEnumType) == 1);

static constexpr uint64_t typeShift = 48;

static constexpr uint64_t typeMask = 0xffull << typeShift;

uint64_t m_encodedPointer;

inline uint64_t encode(void* pointer, ByteSizedEnumType type)

{

uint64_t pointerBits = std::bit_cast<uint64_t>(pointer);

return pointerBits | static_cast<uint64_t>(type) << 48;

}

public:

inline JITConstant()

: m_encodedPointer(0)

{ }

inline JITConstant(void* pointer, ByteSizedEnumType type)

: m_encodedPointer(encode(pointer, type))

{ }

template<typename OtherPointerType>

JITConstant(CompactPointerTuple<OtherPointerType, ByteSizedEnumType> other)

: m_encodedPointer(encode(other.pointer(), other.type()))

{ }

inline uint32_t hash() const { return computeHash(m_encodedPointer); }

inline void* pointer() const { return std::bit_cast<void*>(m_encodedPointer & ~typeMask); }

void setPointer(void* pointer) { m_encodedPointer = encode(pointer, type()); }

inline ByteSizedEnumType type() const { return static_cast<ByteSizedEnumType>((m_encodedPointer & typeMask) >> typeShift); }

void setType(ByteSizedEnumType type) { m_encodedPointer = encode(pointer(), type); }

friend bool operator==(const JITConstant&, const JITConstant&) = default;

};

#endif // ENABLE(JIT)

class JITCode : public ThreadSafeRefCounted<JSC::JITCode> {

public:

template<PtrTag tag> using CodeRef = MacroAssemblerCodeRef<tag>;

static ASCIILiteral typeName(JITType);

static JITType bottomTierJIT()

{

return JITType::BaselineJIT;

}

static JITType topTierJIT()

{

return JITType::FTLJIT;

}

static JITType nextTierJIT(JITType jitType)

{

switch (jitType) {

case JITType::BaselineJIT:

return JITType::DFGJIT;

case JITType::DFGJIT:

return JITType::FTLJIT;

default:

RELEASE_ASSERT_NOT_REACHED();

return JITType::None;

}

static bool isExecutableScript(JITType jitType)

{

switch (jitType) {

case JITType::None:

case JITType::HostCallThunk:

return false;

default:

return true;

}

static bool couldBeInterpreted(JITType jitType)

{

switch (jitType) {

case JITType::InterpreterThunk:

case JITType::BaselineJIT:

return true;

default:

return false;

}

static bool isJIT(JITType jitType)

{

switch (jitType) {

case JITType::BaselineJIT:

case JITType::DFGJIT:

case JITType::FTLJIT:

return true;

default:

return false;

}

static bool isLowerTierPrecise(JITType expectedLower, JITType expectedHigher)

{

RELEASE_ASSERT(isExecutableScript(expectedLower));

RELEASE_ASSERT(isExecutableScript(expectedHigher));

return expectedLower < expectedHigher;

}

static bool isHigherTier(JITType expectedHigher, JITType expectedLower)

{

return isLowerTierPrecise(expectedLower, expectedHigher);

}

static bool isLowerOrSameTier(JITType expectedLower, JITType expectedHigher)

{

return !isHigherTier(expectedLower, expectedHigher);

}

static bool isHigherOrSameTier(JITType expectedHigher, JITType expectedLower)

{

return isLowerOrSameTier(expectedLower, expectedHigher);

}

static bool isOptimizingJIT(JITType jitType)

{

return jitType == JITType::DFGJIT || jitType == JITType::FTLJIT;

}

static bool isBaselineCode(JITType jitType)

{

return jitType == JITType::InterpreterThunk || jitType == JITType::BaselineJIT;

}

virtual const DOMJIT::Signature* signature() const { return nullptr; }

virtual bool canSwapCodeRefForDebugger() const { return false; }

virtual CodeRef<JSEntryPtrTag> swapCodeRefForDebugger(CodeRef<JSEntryPtrTag>);

virtual bool canSwapCodePtrWithArityCheckForDebugger() const { return false; }

virtual CodePtr<JSEntryPtrTag> swapCodePtrWithArityCheckForDebugger(CodePtr<JSEntryPtrTag>);

enum class ShareAttribute : uint8_t {

NotShared,

Shared

};

protected:

JITCode(JITType, CodePtr<JSEntryPtrTag> = nullptr, JITCode::ShareAttribute = JITCode::ShareAttribute::NotShared);

public:

virtual ~JITCode();

JITType jitType() const

{

return m_jitType;

}

bool NODELETE isUnlinked() const;

template<typename PointerType>

static JITType jitTypeFor(PointerType jitCode)

{

if (!jitCode)

return JITType::None;

return jitCode->jitType();

}

void* addressForCall() const { return m_addressForCall.taggedPtr(); }

virtual CodePtr<JSEntryPtrTag> addressForCall(ArityCheckMode) = 0;

virtual void* executableAddressAtOffset(size_t offset) = 0;

void* executableAddress() { return executableAddressAtOffset(0); }

virtual void* dataAddressAtOffset(size_t offset) = 0;

virtual unsigned offsetOf(void* pointerIntoCode) = 0;

virtual DFG::CommonData* dfgCommon();

virtual const DFG::CommonData* dfgCommon() const;

virtual DFG::JITCode* dfg();

virtual FTL::JITCode* ftl();

virtual FTL::ForOSREntryJITCode* ftlForOSREntry();

virtual void shrinkToFit();

virtual void validateReferences(const TrackedReferences&);

void* start() { return dataAddressAtOffset(0); }

virtual size_t size() = 0;

void* end() { return reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(start()) + size()); }

virtual bool contains(void*) = 0;

#if ENABLE(JIT)

virtual RegisterSet liveRegistersToPreserveAtExceptionHandlingCallSite(CodeBlock*, CallSiteIndex);

virtual std::optional<CodeOrigin> findPC(CodeBlock*, void* pc) { UNUSED_PARAM(pc); return std::nullopt; }

#endif

Intrinsic intrinsic() { return m_intrinsic; }

bool isShared() const { return m_shareAttribute == ShareAttribute::Shared; }

virtual PCToCodeOriginMap* pcToCodeOriginMap() { return nullptr; }

const RegisterAtOffsetList* calleeSaveRegisters() const;

static constexpr ptrdiff_t offsetOfJITType() { return OBJECT_OFFSETOF(JSC::JITCode, m_jitType); }

private:

const JITType m_jitType;

const ShareAttribute m_shareAttribute;

protected:

Intrinsic m_intrinsic { NoIntrinsic }; // Effective only in NativeExecutable.

CodePtr<JSEntryPtrTag> m_addressForCall;

};

class JITCodeWithCodeRef : public JSC::JITCode {

protected:

JITCodeWithCodeRef(JITType);

JITCodeWithCodeRef(CodeRef<JSEntryPtrTag>, JITType, JITCode::ShareAttribute);

public:

~JITCodeWithCodeRef() override;

void* executableAddressAtOffset(size_t offset) override;

void* dataAddressAtOffset(size_t offset) override;

unsigned offsetOf(void* pointerIntoCode) override;

size_t size() override;

bool contains(void*) override;

CodeRef<JSEntryPtrTag> swapCodeRefForDebugger(CodeRef<JSEntryPtrTag>) override;

protected:

RefPtr<ExecutableMemoryHandle> m_executableMemory;

};

DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(DirectJITCode);

class DirectJITCode : public JITCodeWithCodeRef {

WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(DirectJITCode, DirectJITCode);

public:

DirectJITCode(JITType);

DirectJITCode(CodeRef<JSEntryPtrTag>, CodePtr<JSEntryPtrTag> withArityCheck, JITType, JITCode::ShareAttribute = JITCode::ShareAttribute::NotShared);

DirectJITCode(CodeRef<JSEntryPtrTag>, CodePtr<JSEntryPtrTag> withArityCheck, JITType, Intrinsic, JITCode::ShareAttribute = JITCode::ShareAttribute::NotShared); // For generated thunk.

~DirectJITCode() override;

CodePtr<JSEntryPtrTag> addressForCall(ArityCheckMode) override;

bool canSwapCodeRefForDebugger() const override { return jitType() == JITType::HostCallThunk; }

bool canSwapCodePtrWithArityCheckForDebugger() const override { return jitType() == JITType::HostCallThunk; }

CodePtr<JSEntryPtrTag> swapCodePtrWithArityCheckForDebugger(CodePtr<JSEntryPtrTag>) override;

protected:

void initializeCodeRefForDFG(CodeRef<JSEntryPtrTag>, CodePtr<JSEntryPtrTag> withArityCheck);

private:

CodePtr<JSEntryPtrTag> m_withArityCheck;

};

class NativeJITCode : public JITCodeWithCodeRef {

public:

NativeJITCode(JITType);

NativeJITCode(CodeRef<JSEntryPtrTag>, JITType, Intrinsic, JITCode::ShareAttribute = JITCode::ShareAttribute::NotShared);

~NativeJITCode() override;

CodePtr<JSEntryPtrTag> addressForCall(ArityCheckMode) override;

bool canSwapCodeRefForDebugger() const override { return true; }

};

class NativeDOMJITCode final : public NativeJITCode {

public:

NativeDOMJITCode(CodeRef<JSEntryPtrTag>, JITType, Intrinsic, const DOMJIT::Signature*);

~NativeDOMJITCode() final = default;

const DOMJIT::Signature* signature() const final { return m_signature; }

private:

const DOMJIT::Signature* m_signature;

};

} // namespace JSC

namespace WTF {

class PrintStream;

void printInternal(PrintStream&, JSC::JITType);

} // namespace WTF

WebKit/Source/JavaScriptCore/jit/JITCode.h at main · WebKit/WebKit · GitHub

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