WebKit/Source/JavaScriptCore/runtime/AssertInvariants.cpp 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.

#include "config.h"

#include "AssertInvariants.h"

#include "ArithProfile.h"

#include "BaselineJITCode.h"

#include "CodeBlock.h"

#include "DFGJITCode.h"

WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN

namespace JSC {

void assertInvariants()

{

// Assertions to match LowLevelInterpreter.asm. If you change any of this code, be

// prepared to change LowLevelInterpreter.asm as well!!

{

#if CPU(REGISTER64)

const ptrdiff_t CallFrameHeaderSlots = 5;

#else

const ptrdiff_t CallFrameHeaderSlots = 4;

#endif

const ptrdiff_t MachineRegisterSize = sizeof(CPURegister);

const ptrdiff_t SlotSize = 8;

static_assert(sizeof(Register) == SlotSize);

static_assert(CallFrame::headerSizeInRegisters == CallFrameHeaderSlots);

static_assert(!CallFrame::callerFrameOffset());

static_assert(CallerFrameAndPC::sizeInRegisters == (MachineRegisterSize * 2) / SlotSize);

static_assert(CallFrame::returnPCOffset() == CallFrame::callerFrameOffset() + MachineRegisterSize);

static_assert(static_cast<std::underlying_type_t<CallFrameSlot>>(CallFrameSlot::codeBlock) * sizeof(Register) == CallFrame::returnPCOffset() + MachineRegisterSize);

static_assert(CallFrameSlot::callee * sizeof(Register) == CallFrameSlot::codeBlock * sizeof(Register) + SlotSize);

static_assert(CallFrameSlot::argumentCountIncludingThis * sizeof(Register) == CallFrameSlot::callee * sizeof(Register) + SlotSize);

static_assert(CallFrameSlot::thisArgument * sizeof(Register) == CallFrameSlot::argumentCountIncludingThis * sizeof(Register) + SlotSize);

static_assert(CallFrame::headerSizeInRegisters == CallFrameSlot::thisArgument);

static_assert(CallFrame::argumentOffsetIncludingThis(0) == CallFrameSlot::thisArgument);

static_assert(HighWordOffset == 4);

static_assert(LowWordOffset == 0);

#if ENABLE(C_LOOP)

ASSERT(CodeBlock::llintBaselineCalleeSaveSpaceAsVirtualRegisters() == 1);

#elif CPU(X86_64) || CPU(ARM64)

ASSERT(CodeBlock::llintBaselineCalleeSaveSpaceAsVirtualRegisters() == 4);

#endif

ASSERT(!(reinterpret_cast<ptrdiff_t>((reinterpret_cast<WriteBarrier<JSCell>*>(0x4000)->slot())) - 0x4000));

}

// FIXME: make these assertions less horrible.

#if ASSERT_ENABLED

Vector<int> testVector;

testVector.resize(42);

ASSERT(std::bit_cast<uint32_t*>(&testVector)[sizeof(void*) / sizeof(uint32_t) + 1] == 42);

ASSERT(std::bit_cast<int**>(&testVector)[0] == testVector.begin());

#endif

{

UnaryArithProfile arithProfile;

arithProfile.argSawInt32();

ASSERT(arithProfile.bits() == UnaryArithProfile::observedIntBits());

ASSERT(arithProfile.argObservedType().isOnlyInt32());

}

{

UnaryArithProfile arithProfile;

arithProfile.argSawNumber();

ASSERT(arithProfile.bits() == UnaryArithProfile::observedNumberBits());

ASSERT(arithProfile.argObservedType().isOnlyNumber());

}

{

BinaryArithProfile arithProfile;

arithProfile.lhsSawInt32();

arithProfile.rhsSawInt32();

ASSERT(arithProfile.bits() == BinaryArithProfile::observedIntIntBits());

ASSERT(arithProfile.lhsObservedType().isOnlyInt32());

ASSERT(arithProfile.rhsObservedType().isOnlyInt32());

}

{

BinaryArithProfile arithProfile;

arithProfile.lhsSawNumber();

arithProfile.rhsSawInt32();

ASSERT(arithProfile.bits() == BinaryArithProfile::observedNumberIntBits());

ASSERT(arithProfile.lhsObservedType().isOnlyNumber());

ASSERT(arithProfile.rhsObservedType().isOnlyInt32());

}

{

BinaryArithProfile arithProfile;

arithProfile.lhsSawNumber();

arithProfile.rhsSawNumber();

ASSERT(arithProfile.bits() == BinaryArithProfile::observedNumberNumberBits());

ASSERT(arithProfile.lhsObservedType().isOnlyNumber());

ASSERT(arithProfile.rhsObservedType().isOnlyNumber());

}

{

BinaryArithProfile arithProfile;

arithProfile.lhsSawInt32();

arithProfile.rhsSawNumber();

ASSERT(arithProfile.bits() == BinaryArithProfile::observedIntNumberBits());

ASSERT(arithProfile.lhsObservedType().isOnlyInt32());

ASSERT(arithProfile.rhsObservedType().isOnlyNumber());

}

#if ENABLE(DFG_JIT)

// We share the same layout for particular fields in all JITData to make our data IC assume this.

static_assert(BaselineJITData::offsetOfGlobalObject() == DFG::JITData::offsetOfGlobalObject());

static_assert(BaselineJITData::offsetOfStackOffset() == DFG::JITData::offsetOfStackOffset());

#endif

}

} // namespace JSC

WTF_ALLOW_UNSAFE_BUFFER_USAGE_END

WebKit/Source/JavaScriptCore/runtime/AssertInvariants.cpp at main · WebKit/WebKit · GitHub

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