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AssertInvariants.cpp
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147 lines (130 loc) · 6.15 KB
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/*
* Copyright (C) 2024 Apple Inc. All rights reserved.
*
* 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 USE(JSVALUE64)
const ptrdiff_t CallFrameHeaderSlots = 5;
#else // USE(JSVALUE64) // i.e. 32-bit version
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);
#if CPU(BIG_ENDIAN)
static_assert(TagOffset == 0);
static_assert(PayloadOffset == 4);
#else
static_assert(TagOffset == 4);
static_assert(PayloadOffset == 0);
#endif
#if ENABLE(C_LOOP)
ASSERT(CodeBlock::llintBaselineCalleeSaveSpaceAsVirtualRegisters() == 1);
#elif USE(JSVALUE32_64)
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