WebKit/Source/JavaScriptCore/ftl/FTLLocation.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 <wtf/Platform.h>

#if ENABLE(FTL_JIT)

#include <JavaScriptCore/DFGCommon.h>

#include <JavaScriptCore/FPRInfo.h>

#include <JavaScriptCore/GPRInfo.h>

#include <JavaScriptCore/Reg.h>

#include <wtf/HashMap.h>

namespace JSC {

namespace B3 {

class ValueRep;

} // namespace B3

namespace FTL {

class Location {

public:

enum Kind {

Unprocessed,

Indirect,

Constant

};

Location()

: m_kind(Unprocessed)

{

u.constant = 0;

}

Location(WTF::HashTableDeletedValueType)

: m_kind(Unprocessed)

{

u.constant = 1;

}

static Location forRegister(Reg reg, int32_t addend)

{

Location result;

result.m_kind = Register;

result.u.variable.regIndex = reg.index();

result.u.variable.offset = addend;

return result;

}

static Location forIndirect(Reg reg, int32_t offset)

{

Location result;

result.m_kind = Indirect;

result.u.variable.regIndex = reg.index();

result.u.variable.offset = offset;

return result;

}

static Location forConstant(int64_t constant)

{

Location result;

result.m_kind = Constant;

result.u.constant = constant;

return result;

}

static Location NODELETE forValueRep(const B3::ValueRep&);

Kind kind() const { return m_kind; }

bool hasReg() const { return kind() == Register || kind() == Indirect; }

Reg reg() const

{

ASSERT(hasReg());

return Reg::fromIndex(u.variable.regIndex);

}

bool hasOffset() const { return kind() == Indirect; }

int32_t offset() const

{

ASSERT(hasOffset());

return u.variable.offset;

}

bool hasAddend() const { return kind() == Register; }

int32_t addend() const

{

ASSERT(hasAddend());

return u.variable.offset;

}

bool hasConstant() const { return kind() == Constant; }

int64_t constant() const

{

ASSERT(hasConstant());

return u.constant;

}

explicit operator bool() const { return kind() != Unprocessed || u.variable.offset; }

bool operator!() const { return !static_cast<bool>(*this); }

bool isHashTableDeletedValue() const { return kind() == Unprocessed && u.variable.offset; }

static constexpr bool safeToCompareToHashTableEmptyOrDeletedValue = true;

bool operator==(const Location& other) const

{

return m_kind == other.m_kind

&& u.constant == other.u.constant;

}

unsigned hash() const

{

unsigned result = m_kind;

switch (kind()) {

case Unprocessed:

result ^= u.variable.offset;

break;

case Register:

result ^= u.variable.regIndex;

break;

case Indirect:

result ^= u.variable.regIndex;

result ^= u.variable.offset;

break;

case Constant:

result ^= WTF::IntHash<int64_t>::hash(u.constant);

break;

}

return WTF::IntHash<unsigned>::hash(result);

}

void dump(PrintStream&) const;

bool NODELETE isGPR() const;

bool NODELETE involvesGPR() const;

GPRReg NODELETE gpr() const;

GPRReg NODELETE directGPR() const; // Get the GPR and assert that there is no addend.

bool NODELETE isFPR() const;

FPRReg NODELETE fpr() const;

// Assuming that all registers are saved to the savedRegisters buffer according

// to FTLSaveRestore convention, this loads the value into the given register.

// The code that this generates isn't exactly super fast. This assumes that FP

// and SP contain the same values that they would have contained in the original

// frame, or that you've done one or more canonically formed calls (i.e. can

// restore the FP by following the call frame linked list numFramesToPop times,

// and SP can be recovered by popping FP numFramesToPop-1 times and adding 16).

void restoreInto(MacroAssembler&, char* savedRegisters, GPRReg result, unsigned numFramesToPop = 0) const;

private:

Kind m_kind;

union {

int64_t constant;

struct {

unsigned regIndex;

int32_t offset;

} variable;

} u;

};

} } // namespace JSC::FTL

namespace WTF {

void printInternal(PrintStream&, JSC::FTL::Location::Kind);

template<typename T> struct HashTraits;

template<> struct HashTraits<JSC::FTL::Location> : SimpleClassHashTraits<JSC::FTL::Location> { };

} // namespace WTF

#endif // ENABLE(FTL_JIT)

WebKit/Source/JavaScriptCore/ftl/FTLLocation.h at main · WebKit/WebKit · GitHub

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