WebKit/Source/JavaScriptCore/assembler/CodeLocation.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/MacroAssemblerCodeRef.h>

namespace JSC {

enum class NearCallMode : uint8_t { Regular, Tail };

template<PtrTag> class CodeLocationInstruction;

template<PtrTag> class CodeLocationLabel;

template<PtrTag> class CodeLocationJump;

template<PtrTag> class CodeLocationCall;

template<PtrTag> class CodeLocationNearCall;

template<PtrTag> class CodeLocationDataLabelCompact;

template<PtrTag> class CodeLocationDataLabel32;

template<PtrTag> class CodeLocationDataLabelPtr;

template<PtrTag> class CodeLocationConvertibleLoad;

// The CodeLocation* types are all pretty much do-nothing wrappers around

// CodePtr. These classes only exist to provide type-safety when linking and

// patching code.

// The one new piece of functionallity introduced by these classes is the

// ability to create (or put another way, to re-discover) another CodeLocation

// at an offset from one you already know. When patching code to optimize it

// we often want to patch a number of instructions that are short, fixed

// offsets apart. To reduce memory overhead we will only retain a pointer to

// one of the instructions, and we will use the *AtOffset methods provided by

// CodeLocationCommon to find the other points in the code to modify.

template<PtrTag tag>

class CodeLocationCommon : public CodePtr<tag> {

using Base = CodePtr<tag>;

public:

template<PtrTag resultTag = tag> CodeLocationInstruction<resultTag> instructionAtOffset(int offset);

template<PtrTag resultTag = tag> CodeLocationLabel<resultTag> labelAtOffset(int offset);

template<PtrTag resultTag = tag> CodeLocationJump<resultTag> jumpAtOffset(int offset);

template<PtrTag resultTag = tag> CodeLocationCall<resultTag> callAtOffset(int offset);

template<PtrTag resultTag = tag> CodeLocationNearCall<resultTag> nearCallAtOffset(int offset, NearCallMode);

template<PtrTag resultTag = tag> CodeLocationDataLabelPtr<resultTag> dataLabelPtrAtOffset(int offset);

template<PtrTag resultTag = tag> CodeLocationDataLabel32<resultTag> dataLabel32AtOffset(int offset);

template<PtrTag resultTag = tag> CodeLocationDataLabelCompact<resultTag> dataLabelCompactAtOffset(int offset);

template<PtrTag resultTag = tag> CodeLocationConvertibleLoad<resultTag> convertibleLoadAtOffset(int offset);

template<typename T = void*>

T dataLocation() const { return Base::template dataLocation<T>(); }

template<typename T>

requires (std::is_base_of_v<CodeLocationCommon<tag>, T>)

operator T()

{

return T(CodePtr<tag>::fromTaggedPtr(this->taggedPtr()));

}

protected:

CodeLocationCommon()

{

}

CodeLocationCommon(CodePtr<tag> location)

: CodePtr<tag>(location)

{

}

};

template<PtrTag tag>

class CodeLocationInstruction : public CodeLocationCommon<tag> {

public:

CodeLocationInstruction() { }

explicit CodeLocationInstruction(CodePtr<tag> location)

: CodeLocationCommon<tag>(location) { }

explicit CodeLocationInstruction(void* location)

: CodeLocationCommon<tag>(CodePtr<tag>(location)) { }

};

template<PtrTag tag>

class CodeLocationLabel : public CodeLocationCommon<tag> {

public:

CodeLocationLabel() { }

explicit CodeLocationLabel(CodePtr<tag> location)

: CodeLocationCommon<tag>(location) { }

explicit CodeLocationLabel(void* location)

: CodeLocationCommon<tag>(CodePtr<tag>(location)) { }

template<PtrTag newTag>

CodeLocationLabel<newTag> retagged() { return CodeLocationLabel<newTag>(CodeLocationCommon<tag>::template retagged<newTag>()); }

template<typename T = void*>

T untaggedPtr() const { return CodeLocationCommon<tag>::template untaggedPtr<T>(); }

template<typename T = void*>

T dataLocation() const { return CodeLocationCommon<tag>::template dataLocation<T>(); }

};

template<PtrTag tag>

class CodeLocationJump : public CodeLocationCommon<tag> {

public:

CodeLocationJump() { }

explicit CodeLocationJump(CodePtr<tag> location)

: CodeLocationCommon<tag>(location) { }

explicit CodeLocationJump(void* location)

: CodeLocationCommon<tag>(CodePtr<tag>(location)) { }

template<PtrTag newTag>

CodeLocationJump<newTag> retagged() { return CodeLocationJump<newTag>(CodePtr<tag>::template retagged<newTag>()); }

};

template<PtrTag tag>

class CodeLocationCall : public CodeLocationCommon<tag> {

public:

CodeLocationCall() { }

explicit CodeLocationCall(CodePtr<tag> location)

: CodeLocationCommon<tag>(location) { }

explicit CodeLocationCall(void* location)

: CodeLocationCommon<tag>(CodePtr<tag>(location)) { }

template<PtrTag newTag>

CodeLocationCall<newTag> retagged() { return CodeLocationCall<newTag>(CodeLocationCommon<tag>::template retagged<newTag>()); }

};

template<PtrTag tag>

class CodeLocationNearCall : public CodeLocationCommon<tag> {

public:

CodeLocationNearCall() { }

explicit CodeLocationNearCall(CodePtr<tag> location, NearCallMode callMode)

: CodeLocationCommon<tag>(location), m_callMode(callMode) { }

explicit CodeLocationNearCall(void* location, NearCallMode callMode)

: CodeLocationCommon<tag>(CodePtr<tag>(location)), m_callMode(callMode) { }

NearCallMode callMode() { return m_callMode; }

private:

NearCallMode m_callMode { NearCallMode::Regular };

};

template<PtrTag tag>

class CodeLocationDataLabel32 : public CodeLocationCommon<tag> {

public:

CodeLocationDataLabel32() { }

explicit CodeLocationDataLabel32(CodePtr<tag> location)

: CodeLocationCommon<tag>(location) { }

explicit CodeLocationDataLabel32(void* location)

: CodeLocationCommon<tag>(CodePtr<tag>(location)) { }

};

template<PtrTag tag>

class CodeLocationDataLabelCompact : public CodeLocationCommon<tag> {

public:

CodeLocationDataLabelCompact() { }

explicit CodeLocationDataLabelCompact(CodePtr<tag> location)

: CodeLocationCommon<tag>(location) { }

explicit CodeLocationDataLabelCompact(void* location)

: CodeLocationCommon<tag>(CodePtr<tag>(location)) { }

};

template<PtrTag tag>

class CodeLocationDataLabelPtr : public CodeLocationCommon<tag> {

public:

CodeLocationDataLabelPtr() { }

explicit CodeLocationDataLabelPtr(CodePtr<tag> location)

: CodeLocationCommon<tag>(location) { }

explicit CodeLocationDataLabelPtr(void* location)

: CodeLocationCommon<tag>(CodePtr<tag>(location)) { }

};

template<PtrTag tag>

class CodeLocationConvertibleLoad : public CodeLocationCommon<tag> {

public:

CodeLocationConvertibleLoad() { }

explicit CodeLocationConvertibleLoad(CodePtr<tag> location)

: CodeLocationCommon<tag>(location) { }

explicit CodeLocationConvertibleLoad(void* location)

: CodeLocationCommon<tag>(CodePtr<tag>(location)) { }

};

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationInstruction<resultTag> CodeLocationCommon<tag>::instructionAtOffset(int offset)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationInstruction<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset));

}

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationLabel<resultTag> CodeLocationCommon<tag>::labelAtOffset(int offset)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationLabel<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset));

}

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationJump<resultTag> CodeLocationCommon<tag>::jumpAtOffset(int offset)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationJump<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset));

}

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationCall<resultTag> CodeLocationCommon<tag>::callAtOffset(int offset)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationCall<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset));

}

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationNearCall<resultTag> CodeLocationCommon<tag>::nearCallAtOffset(int offset, NearCallMode callMode)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationNearCall<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset), callMode);

}

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationDataLabelPtr<resultTag> CodeLocationCommon<tag>::dataLabelPtrAtOffset(int offset)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationDataLabelPtr<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset));

}

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationDataLabel32<resultTag> CodeLocationCommon<tag>::dataLabel32AtOffset(int offset)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationDataLabel32<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset));

}

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationDataLabelCompact<resultTag> CodeLocationCommon<tag>::dataLabelCompactAtOffset(int offset)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationDataLabelCompact<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset));

}

template<PtrTag tag>

template<PtrTag resultTag>

inline CodeLocationConvertibleLoad<resultTag> CodeLocationCommon<tag>::convertibleLoadAtOffset(int offset)

{

ASSERT_VALID_CODE_OFFSET(offset);

return CodeLocationConvertibleLoad<resultTag>(tagCodePtr<resultTag>(dataLocation<char*>() + offset));

}

} // namespace JSC

WebKit/Source/JavaScriptCore/assembler/CodeLocation.h at main · WebKit/WebKit · GitHub

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