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Copy pathArithProfile.cpp
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238 lines (206 loc) · 8.34 KB
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/*
* Copyright (C) 2016-2020 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 "ArithProfile.h"
#include "CCallHelpers.h"
#include "JSCJSValueInlines.h"
namespace JSC {
#if ENABLE(JIT)
template<typename BitfieldType>
void ArithProfile<BitfieldType>::emitObserveResult(CCallHelpers& jit, GPRReg valueGPR, GPRReg tempGPR, TagRegistersMode mode)
{
if (!shouldEmitSetDouble() && !shouldEmitSetNonNumeric() && !shouldEmitSetHeapBigInt())
return;
CCallHelpers::JumpList done;
CCallHelpers::JumpList nonNumeric;
done.append(jit.branchIfInt32(valueGPR, mode));
CCallHelpers::Jump notDouble = jit.branchIfNotDoubleKnownNotInt32(valueGPR, mode);
if (shouldEmitSetDouble()) {
constexpr BitfieldType doubleBits = ObservedResults::Int32Overflow | ObservedResults::NegZeroDouble | ObservedResults::NonNegZeroDouble;
if ((m_bits & doubleBits) != doubleBits)
emitUnconditionalSet(jit, doubleBits);
if (!didObserveInt52Overflow()) {
if (mode == DoNotHaveTagRegisters) {
jit.move(CCallHelpers::TrustedImm64(JSValue::NumberTag), tempGPR);
jit.add64(valueGPR, tempGPR);
} else
jit.add64(GPRInfo::numberTagRegister, valueGPR, tempGPR);
emitSetInt52OverflowIfNeeded(jit, tempGPR);
}
}
done.append(jit.jump());
notDouble.link(&jit);
nonNumeric.append(jit.branchIfNotCell(valueGPR, mode));
nonNumeric.append(jit.branchIfNotHeapBigInt(valueGPR));
emitSetHeapBigInt(jit);
done.append(jit.jump());
nonNumeric.link(&jit);
emitSetNonNumeric(jit);
done.link(&jit);
}
template<typename BitfieldType>
bool ArithProfile<BitfieldType>::shouldEmitSetDouble() const
{
BitfieldType mask = ObservedResults::Int32Overflow | ObservedResults::Int52Overflow | ObservedResults::NegZeroDouble | ObservedResults::NonNegZeroDouble;
return (m_bits & mask) != mask;
}
template<typename BitfieldType>
void ArithProfile<BitfieldType>::emitSetDouble(CCallHelpers& jit, GPRReg scratchGPR) const
{
if (shouldEmitSetDouble()) {
#if CPU(ARM64)
jit.move(CCallHelpers::TrustedImm32(ObservedResults::Int32Overflow | ObservedResults::Int52Overflow | ObservedResults::NegZeroDouble | ObservedResults::NonNegZeroDouble), scratchGPR);
emitUnconditionalSet(jit, scratchGPR);
#else
UNUSED_PARAM(scratchGPR);
emitUnconditionalSet(jit, ObservedResults::Int32Overflow | ObservedResults::Int52Overflow | ObservedResults::NegZeroDouble | ObservedResults::NonNegZeroDouble);
#endif
}
}
template<typename BitfieldType>
void ArithProfile<BitfieldType>::emitSetInt52OverflowIfNeeded(CCallHelpers& jit, GPRReg doubleBitsGPR) const
{
constexpr double overflowPoint = static_cast<double>(ObservedResults::int52OverflowPoint);
CCallHelpers::JumpList inRange;
inRange.append(jit.branch64(CCallHelpers::Equal, doubleBitsGPR, CCallHelpers::TrustedImm64(std::bit_cast<uint64_t>(-overflowPoint))));
// Shifting out the sign bit orders the remaining bits by magnitude; NaN and Infinity sort above every finite value.
jit.lshift64(CCallHelpers::TrustedImm32(1), doubleBitsGPR);
inRange.append(jit.branch64(CCallHelpers::Below, doubleBitsGPR, CCallHelpers::TrustedImm64(std::bit_cast<uint64_t>(overflowPoint) << 1)));
emitUnconditionalSet(jit, ObservedResults::Int52Overflow);
inRange.link(&jit);
}
template<typename BitfieldType>
bool ArithProfile<BitfieldType>::shouldEmitSetNonNumeric() const
{
BitfieldType mask = ObservedResults::NonNumeric;
return (m_bits & mask) != mask;
}
template<typename BitfieldType>
void ArithProfile<BitfieldType>::emitSetNonNumeric(CCallHelpers& jit) const
{
if (shouldEmitSetNonNumeric())
emitUnconditionalSet(jit, ObservedResults::NonNumeric);
}
template<typename BitfieldType>
bool ArithProfile<BitfieldType>::shouldEmitSetHeapBigInt() const
{
BitfieldType mask = ObservedResults::HeapBigInt;
return (m_bits & mask) != mask;
}
template<typename BitfieldType>
void ArithProfile<BitfieldType>::emitSetHeapBigInt(CCallHelpers& jit) const
{
if (shouldEmitSetHeapBigInt())
emitUnconditionalSet(jit, ObservedResults::HeapBigInt);
}
template<typename BitfieldType>
void ArithProfile<BitfieldType>::emitUnconditionalSet(CCallHelpers& jit, BitfieldType mask) const
{
static_assert(std::same_as<BitfieldType, uint16_t>);
jit.or16(CCallHelpers::TrustedImm32(mask), CCallHelpers::AbsoluteAddress(addressOfBits()));
}
template<typename BitfieldType>
void ArithProfile<BitfieldType>::emitUnconditionalSet(CCallHelpers& jit, GPRReg mask) const
{
jit.or16(mask, CCallHelpers::AbsoluteAddress(addressOfBits()));
}
// Generate the implementations of the functions above for UnaryArithProfile/BinaryArithProfile
// If changing the size of either, add the corresponding lines here.
template class ArithProfile<uint16_t>;
#endif // ENABLE(JIT)
} // namespace JSC
namespace WTF {
using namespace JSC;
template <typename T>
void printInternal(PrintStream& out, const ArithProfile<T>& profile)
{
const char* separator = "";
out.print("Result:<");
if (!profile.didObserveNonInt32()) {
out.print("Int32");
separator = "|";
} else {
if (profile.didObserveNegZeroDouble()) {
out.print(separator, "NegZeroDouble");
separator = "|";
}
if (profile.didObserveNonNegZeroDouble()) {
out.print(separator, "NonNegZeroDouble");
separator = "|";
}
if (profile.didObserveNonNumeric()) {
out.print(separator, "NonNumeric");
separator = "|";
}
if (profile.didObserveInt32Overflow()) {
out.print(separator, "Int32Overflow");
separator = "|";
}
if (profile.didObserveInt52Overflow()) {
out.print(separator, "Int52Overflow");
separator = "|";
}
if (profile.didObserveHeapBigInt()) {
out.print(separator, "HeapBigInt");
separator = "|";
}
}
out.print(">");
}
void printInternal(PrintStream& out, const UnaryArithProfile& profile)
{
printInternal(out, static_cast<ArithProfile<UnaryArithProfileBase>>(profile));
out.print(" Arg ObservedType:<");
out.print(profile.argObservedType());
out.print(">");
}
void printInternal(PrintStream& out, const BinaryArithProfile& profile)
{
printInternal(out, static_cast<ArithProfile<UnaryArithProfileBase>>(profile));
if (profile.tookSpecialFastPath())
out.print(" Took special fast path.");
out.print(" LHS ObservedType:<");
out.print(profile.lhsObservedType());
out.print("> RHS ObservedType:<");
out.print(profile.rhsObservedType());
out.print(">");
}
void printInternal(PrintStream& out, const JSC::ObservedType& observedType)
{
const char* separator = "";
if (observedType.sawInt32()) {
out.print(separator, "Int32");
separator = "|";
}
if (observedType.sawNumber()) {
out.print(separator, "Number");
separator = "|";
}
if (observedType.sawNonNumber()) {
out.print(separator, "NonNumber");
separator = "|";
}
}
} // namespace WTF