CacheIRCompiler.cpp

mozilla-central/js/src/jit/CacheIRCompiler.cpp

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If a copy of the MPL was not distributed with this* file, You can obtain one at http://mozilla.org/MPL/2.0/. /#include "jit/CacheIRCompiler.h"#include "mozilla/ArrayUtils.h"#include "mozilla/ScopeExit.h"#include <utility>#include "jslibmath.h"#include "jit/IonIC.h"#include "jit/SharedICHelpers.h"#include "jit/SharedICRegisters.h"#include "vm/GeneratorObject.h"#include "builtin/Boolean-inl.h"#include "jit/MacroAssembler-inl.h"#include "vm/Realm-inl.h"using namespace js;using namespace js::jit;using mozilla::BitwiseCast;using mozilla::Maybe;ValueOperand CacheRegisterAllocator::useValueRegister(MacroAssembler& masm,ValOperandId op) {OperandLocation& loc = operandLocations_[op.id()];switch (loc.kind()) {case OperandLocation::ValueReg:currentOpRegs_.add(loc.valueReg());return loc.valueReg();case OperandLocation::ValueStack: {ValueOperand reg = allocateValueRegister(masm);popValue(masm, &loc, reg);return reg;}case OperandLocation::BaselineFrame: {ValueOperand reg = allocateValueRegister(masm);Address addr = addressOf(masm, loc.baselineFrameSlot());masm.loadValue(addr, reg);loc.setValueReg(reg);return reg;}case OperandLocation::Constant: {ValueOperand reg = allocateValueRegister(masm);masm.moveValue(loc.constant(), reg);loc.setValueReg(reg);return reg;}case OperandLocation::PayloadReg: {// Temporarily add the payload register to currentOpRegs_ so// allocateValueRegister will stay away from it.currentOpRegs_.add(loc.payloadReg());ValueOperand reg = allocateValueRegister(masm);masm.tagValue(loc.payloadType(), loc.payloadReg(), reg);currentOpRegs_.take(loc.payloadReg());availableRegs_.add(loc.payloadReg());loc.setValueReg(reg);return reg;}case OperandLocation::PayloadStack: {ValueOperand reg = allocateValueRegister(masm);popPayload(masm, &loc, reg.scratchReg());masm.tagValue(loc.payloadType(), reg.scratchReg(), reg);loc.setValueReg(reg);return reg;}case OperandLocation::DoubleReg: {ValueOperand reg = allocateValueRegister(masm);masm.boxDouble(loc.doubleReg(), reg, ScratchDoubleReg);loc.setValueReg(reg);return reg;}case OperandLocation::Uninitialized:break;}MOZ_CRASH();}// Load a value operand directly into a float register. Caller must have// guarded isNumber on the provided val.void CacheRegisterAllocator::ensureDoubleRegister(MacroAssembler& masm,ValOperandId op,FloatRegister dest) {OperandLocation& loc = operandLocations_[op.id()];Label failure, done;switch (loc.kind()) {case OperandLocation::ValueReg: {masm.ensureDouble(loc.valueReg(), dest, &failure);break;}case OperandLocation::ValueStack: {masm.ensureDouble(valueAddress(masm, &loc), dest, &failure);break;}case OperandLocation::BaselineFrame: {Address addr = addressOf(masm, loc.baselineFrameSlot());masm.ensureDouble(addr, dest, &failure);break;}case OperandLocation::DoubleReg: {masm.moveDouble(loc.doubleReg(), dest);loc.setDoubleReg(dest);return;}case OperandLocation::Constant:case OperandLocation::PayloadStack:case OperandLocation::PayloadReg:case OperandLocation::Uninitialized:MOZ_CRASH("Unhandled operand type in ensureDoubleRegister");return;}masm.jump(&done);masm.bind(&failure);masm.assumeUnreachable("Missing guard allowed non-number to hit ensureDoubleRegister");masm.bind(&done);}ValueOperand CacheRegisterAllocator::useFixedValueRegister(MacroAssembler& masm,ValOperandId valId,ValueOperand reg) {allocateFixedValueRegister(masm, reg);OperandLocation& loc = operandLocations_[valId.id()];switch (loc.kind()) {case OperandLocation::ValueReg:masm.moveValue(loc.valueReg(), reg);MOZ_ASSERT(!currentOpRegs_.aliases(loc.valueReg()),"Register shouldn't be in use");availableRegs_.add(loc.valueReg());break;case OperandLocation::ValueStack:popValue(masm, &loc, reg);break;case OperandLocation::BaselineFrame: {Address addr = addressOf(masm, loc.baselineFrameSlot());masm.loadValue(addr, reg);break;}case OperandLocation::Constant:masm.moveValue(loc.constant(), reg);break;case OperandLocation::PayloadReg:masm.tagValue(loc.payloadType(), loc.payloadReg(), reg);MOZ_ASSERT(!currentOpRegs_.has(loc.payloadReg()),"Register shouldn't be in use");availableRegs_.add(loc.payloadReg());break;case OperandLocation::PayloadStack:popPayload(masm, &loc, reg.scratchReg());masm.tagValue(loc.payloadType(), reg.scratchReg(), reg);break;case OperandLocation::DoubleReg:masm.boxDouble(loc.doubleReg(), reg, ScratchDoubleReg);break;case OperandLocation::Uninitialized:MOZ_CRASH();}loc.setValueReg(reg);return reg;}Register CacheRegisterAllocator::useRegister(MacroAssembler& masm,TypedOperandId typedId) {MOZ_ASSERT(!addedFailurePath_);OperandLocation& loc = operandLocations_[typedId.id()];switch (loc.kind()) {case OperandLocation::PayloadReg:currentOpRegs_.add(loc.payloadReg());return loc.payloadReg();case OperandLocation::ValueReg: {// It's possible the value is still boxed: as an optimization, we unbox// the first time we use a value as object.ValueOperand val = loc.valueReg();availableRegs_.add(val);Register reg = val.scratchReg();availableRegs_.take(reg);masm.unboxNonDouble(val, reg, typedId.type());loc.setPayloadReg(reg, typedId.type());currentOpRegs_.add(reg);return reg;}case OperandLocation::PayloadStack: {Register reg = allocateRegister(masm);popPayload(masm, &loc, reg);return reg;}case OperandLocation::ValueStack: {// The value is on the stack, but boxed. If it's on top of the stack we// unbox it and then remove it from the stack, else we just unbox.Register reg = allocateRegister(masm);if (loc.valueStack() == stackPushed_) {masm.unboxNonDouble(Address(masm.getStackPointer(), 0), reg,typedId.type());masm.addToStackPtr(Imm32(sizeof(js::Value)));MOZ_ASSERT(stackPushed_ >= sizeof(js::Value));stackPushed_ -= sizeof(js::Value);} else {MOZ_ASSERT(loc.valueStack() < stackPushed_);masm.unboxNonDouble(Address(masm.getStackPointer(), stackPushed_ - loc.valueStack()),reg, typedId.type());}loc.setPayloadReg(reg, typedId.type());return reg;}case OperandLocation::BaselineFrame: {Register reg = allocateRegister(masm);Address addr = addressOf(masm, loc.baselineFrameSlot());masm.unboxNonDouble(addr, reg, typedId.type());loc.setPayloadReg(reg, typedId.type());return reg;};case OperandLocation::Constant: {Value v = loc.constant();Register reg = allocateRegister(masm);if (v.isString()) {masm.movePtr(ImmGCPtr(v.toString()), reg);} else if (v.isSymbol()) {masm.movePtr(ImmGCPtr(v.toSymbol()), reg);} else {MOZ_CRASH("Unexpected Value");}loc.setPayloadReg(reg, v.extractNonDoubleType());return reg;}case OperandLocation::DoubleReg:case OperandLocation::Uninitialized:break;}MOZ_CRASH();}ConstantOrRegister CacheRegisterAllocator::useConstantOrRegister(MacroAssembler& masm, ValOperandId val) {MOZ_ASSERT(!addedFailurePath_);OperandLocation& loc = operandLocations_[val.id()];switch (loc.kind()) {case OperandLocation::Constant:return loc.constant();case OperandLocation::PayloadReg:case OperandLocation::PayloadStack: {JSValueType payloadType = loc.payloadType();Register reg = useRegister(masm, TypedOperandId(val, payloadType));return TypedOrValueRegister(MIRTypeFromValueType(payloadType),AnyRegister(reg));}case OperandLocation::ValueReg:case OperandLocation::ValueStack:case OperandLocation::BaselineFrame:return TypedOrValueRegister(useValueRegister(masm, val));case OperandLocation::DoubleReg:return TypedOrValueRegister(MIRType::Double,AnyRegister(loc.doubleReg()));case OperandLocation::Uninitialized:break;}MOZ_CRASH();}Register CacheRegisterAllocator::defineRegister(MacroAssembler& masm,TypedOperandId typedId) {MOZ_ASSERT(!addedFailurePath_);OperandLocation& loc = operandLocations_[typedId.id()];MOZ_ASSERT(loc.kind() == OperandLocation::Uninitialized);Register reg = allocateRegister(masm);loc.setPayloadReg(reg, typedId.type());return reg;}ValueOperand CacheRegisterAllocator::defineValueRegister(MacroAssembler& masm,ValOperandId val) {MOZ_ASSERT(!addedFailurePath_);OperandLocation& loc = operandLocations_[val.id()];MOZ_ASSERT(loc.kind() == OperandLocation::Uninitialized);ValueOperand reg = allocateValueRegister(masm);loc.setValueReg(reg);return reg;}void CacheRegisterAllocator::freeDeadOperandLocations(MacroAssembler& masm) {// See if any operands are dead so we can reuse their registers. Note that// we skip the input operands, as those are also used by failure paths, and// we currently don't track those uses.for (size_t i = writer_.numInputOperands(); i < operandLocations_.length();i++) {if (!writer_.operandIsDead(i, currentInstruction_)) {continue;}OperandLocation& loc = operandLocations_[i];switch (loc.kind()) {case OperandLocation::PayloadReg:availableRegs_.add(loc.payloadReg());break;case OperandLocation::ValueReg:availableRegs_.add(loc.valueReg());break;case OperandLocation::PayloadStack:masm.propagateOOM(freePayloadSlots_.append(loc.payloadStack()));break;case OperandLocation::ValueStack:masm.propagateOOM(freeValueSlots_.append(loc.valueStack()));break;case OperandLocation::Uninitialized:case OperandLocation::BaselineFrame:case OperandLocation::Constant:case OperandLocation::DoubleReg:break;}loc.setUninitialized();}}void CacheRegisterAllocator::discardStack(MacroAssembler& masm) {// This should only be called when we are no longer using the operands,// as we're discarding everything from the native stack. Set all operand// locations to Uninitialized to catch bugs.for (size_t i = 0; i < operandLocations_.length(); i++) {operandLocations_[i].setUninitialized();}if (stackPushed_ > 0) {masm.addToStackPtr(Imm32(stackPushed_));stackPushed_ = 0;}freePayloadSlots_.clear();freeValueSlots_.clear();}Register CacheRegisterAllocator::allocateRegister(MacroAssembler& masm) {MOZ_ASSERT(!addedFailurePath_);if (availableRegs_.empty()) {freeDeadOperandLocations(masm);}if (availableRegs_.empty()) {// Still no registers available, try to spill unused operands to// the stack.for (size_t i = 0; i < operandLocations_.length(); i++) {OperandLocation& loc = operandLocations_[i];if (loc.kind() == OperandLocation::PayloadReg) {Register reg = loc.payloadReg();if (currentOpRegs_.has(reg)) {continue;}spillOperandToStack(masm, &loc);availableRegs_.add(reg);break; // We got a register, so break out of the loop.}if (loc.kind() == OperandLocation::ValueReg) {ValueOperand reg = loc.valueReg();if (currentOpRegs_.aliases(reg)) {continue;}spillOperandToStack(masm, &loc);availableRegs_.add(reg);break; // Break out of the loop.}}}if (availableRegs_.empty() && !availableRegsAfterSpill_.empty()) {Register reg = availableRegsAfterSpill_.takeAny();masm.push(reg);stackPushed_ += sizeof(uintptr_t);masm.propagateOOM(spilledRegs_.append(SpilledRegister(reg, stackPushed_)));availableRegs_.add(reg);}// At this point, there must be a free register.MOZ_RELEASE_ASSERT(!availableRegs_.empty());Register reg = availableRegs_.takeAny();currentOpRegs_.add(reg);return reg;}void CacheRegisterAllocator::allocateFixedRegister(MacroAssembler& masm,Register reg) {MOZ_ASSERT(!addedFailurePath_);// Fixed registers should be allocated first, to ensure they're// still available.MOZ_ASSERT(!currentOpRegs_.has(reg), "Register is in use");freeDeadOperandLocations(masm);if (availableRegs_.has(reg)) {availableRegs_.take(reg);currentOpRegs_.add(reg);return;}// Register may be available only after spilling contents.if (availableRegsAfterSpill_.has(reg)) {availableRegsAfterSpill_.take(reg);masm.push(reg);stackPushed_ += sizeof(uintptr_t);masm.propagateOOM(spilledRegs_.append(SpilledRegister(reg, stackPushed_)));currentOpRegs_.add(reg);return;}// The register must be used by some operand. Spill it to the stack.for (size_t i = 0; i < operandLocations_.length(); i++) {OperandLocation& loc = operandLocations_[i];if (loc.kind() == OperandLocation::PayloadReg) {if (loc.payloadReg() != reg) {continue;}spillOperandToStackOrRegister(masm, &loc);currentOpRegs_.add(reg);return;}if (loc.kind() == OperandLocation::ValueReg) {if (!loc.valueReg().aliases(reg)) {continue;}ValueOperand valueReg = loc.valueReg();spillOperandToStackOrRegister(masm, &loc);availableRegs_.add(valueReg);availableRegs_.take(reg);currentOpRegs_.add(reg);return;}}MOZ_CRASH("Invalid register");}void CacheRegisterAllocator::allocateFixedValueRegister(MacroAssembler& masm,ValueOperand reg) {#ifdef JS_NUNBOX32allocateFixedRegister(masm, reg.payloadReg());allocateFixedRegister(masm, reg.typeReg());#elseallocateFixedRegister(masm, reg.valueReg());#endif}ValueOperand CacheRegisterAllocator::allocateValueRegister(MacroAssembler& masm) {#ifdef JS_NUNBOX32Register reg1 = allocateRegister(masm);Register reg2 = allocateRegister(masm);return ValueOperand(reg1, reg2);#elseRegister reg = allocateRegister(masm);return ValueOperand(reg);#endif}bool CacheRegisterAllocator::init() {if (!origInputLocations_.resize(writer_.numInputOperands())) {return false;}if (!operandLocations_.resize(writer_.numOperandIds())) {return false;}return true;}void CacheRegisterAllocator::initAvailableRegsAfterSpill() {// Registers not in availableRegs_ and not used by input operands are// available after being spilled.availableRegsAfterSpill_.set() = GeneralRegisterSet::Intersect(GeneralRegisterSet::Not(availableRegs_.set()),GeneralRegisterSet::Not(inputRegisterSet()));}void CacheRegisterAllocator::fixupAliasedInputs(MacroAssembler& masm) {// If IC inputs alias each other, make sure they are stored in different// locations so we don't have to deal with this complexity in the rest of// the allocator.//// Note that this can happen in IonMonkey with something like \|o.foo = o\|// or \|o[i] = i\|.size_t numInputs = writer_.numInputOperands();MOZ_ASSERT(origInputLocations_.length() == numInputs);for (size_t i = 1; i < numInputs; i++) {OperandLocation& loc1 = operandLocations_[i];if (!loc1.isInRegister()) {continue;}for (size_t j = 0; j < i; j++) {OperandLocation& loc2 = operandLocations_[j];if (!loc1.aliasesReg(loc2)) {continue;}// loc1 and loc2 alias so we spill one of them. If one is a// ValueReg and the other is a PayloadReg, we have to spill the// PayloadReg: spilling the ValueReg instead would leave its type// register unallocated on 32-bit platforms.if (loc1.kind() == OperandLocation::ValueReg) {spillOperandToStack(masm, &loc2);} else {MOZ_ASSERT(loc1.kind() == OperandLocation::PayloadReg);spillOperandToStack(masm, &loc1);break; // Spilled loc1, so nothing else will alias it.}}}#ifdef DEBUGassertValidState();#endif}GeneralRegisterSet CacheRegisterAllocator::inputRegisterSet() const {MOZ_ASSERT(origInputLocations_.length() == writer_.numInputOperands());AllocatableGeneralRegisterSet result;for (size_t i = 0; i < writer_.numInputOperands(); i++) {const OperandLocation& loc = operandLocations_[i];MOZ_ASSERT(loc == origInputLocations_[i]);switch (loc.kind()) {case OperandLocation::PayloadReg:result.addUnchecked(loc.payloadReg());continue;case OperandLocation::ValueReg:result.addUnchecked(loc.valueReg());continue;case OperandLocation::PayloadStack:case OperandLocation::ValueStack:case OperandLocation::BaselineFrame:case OperandLocation::Constant:case OperandLocation::DoubleReg:continue;case OperandLocation::Uninitialized:break;}MOZ_CRASH("Invalid kind");}return result.set();}JSValueType CacheRegisterAllocator::knownType(ValOperandId val) const {const OperandLocation& loc = operandLocations_[val.id()];switch (loc.kind()) {case OperandLocation::ValueReg:case OperandLocation::ValueStack:case OperandLocation::BaselineFrame:return JSVAL_TYPE_UNKNOWN;case OperandLocation::PayloadStack:case OperandLocation::PayloadReg:return loc.payloadType();case OperandLocation::Constant:return loc.constant().isDouble() ? JSVAL_TYPE_DOUBLE: loc.constant().extractNonDoubleType();case OperandLocation::DoubleReg:return JSVAL_TYPE_DOUBLE;case OperandLocation::Uninitialized:break;}MOZ_CRASH("Invalid kind");}void CacheRegisterAllocator::initInputLocation(size_t i, const TypedOrValueRegister& reg) {if (reg.hasValue()) {initInputLocation(i, reg.valueReg());} else if (reg.typedReg().isFloat()) {MOZ_ASSERT(reg.type() == MIRType::Double);initInputLocation(i, reg.typedReg().fpu());} else {initInputLocation(i, reg.typedReg().gpr(),ValueTypeFromMIRType(reg.type()));}}void CacheRegisterAllocator::initInputLocation(size_t i, const ConstantOrRegister& value) {if (value.constant()) {initInputLocation(i, value.value());} else {initInputLocation(i, value.reg());}}void CacheRegisterAllocator::spillOperandToStack(MacroAssembler& masm,OperandLocation loc) {MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());if (loc->kind() == OperandLocation::ValueReg) {if (!freeValueSlots_.empty()) {uint32_t stackPos = freeValueSlots_.popCopy();MOZ_ASSERT(stackPos <= stackPushed_);masm.storeValue(loc->valueReg(),Address(masm.getStackPointer(), stackPushed_ - stackPos));loc->setValueStack(stackPos);return;}stackPushed_ += sizeof(js::Value);masm.pushValue(loc->valueReg());loc->setValueStack(stackPushed_);return;}MOZ_ASSERT(loc->kind() == OperandLocation::PayloadReg);if (!freePayloadSlots_.empty()) {uint32_t stackPos = freePayloadSlots_.popCopy();MOZ_ASSERT(stackPos <= stackPushed_);masm.storePtr(loc->payloadReg(),Address(masm.getStackPointer(), stackPushed_ - stackPos));loc->setPayloadStack(stackPos, loc->payloadType());return;}stackPushed_ += sizeof(uintptr_t);masm.push(loc->payloadReg());loc->setPayloadStack(stackPushed_, loc->payloadType());}void CacheRegisterAllocator::spillOperandToStackOrRegister(MacroAssembler& masm, OperandLocation* loc) {MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());// If enough registers are available, use them.if (loc->kind() == OperandLocation::ValueReg) {static const size_t BoxPieces = sizeof(Value) / sizeof(uintptr_t);if (availableRegs_.set().size() >= BoxPieces) {ValueOperand reg = availableRegs_.takeAnyValue();masm.moveValue(loc->valueReg(), reg);loc->setValueReg(reg);return;}} else {MOZ_ASSERT(loc->kind() == OperandLocation::PayloadReg);if (!availableRegs_.empty()) {Register reg = availableRegs_.takeAny();masm.movePtr(loc->payloadReg(), reg);loc->setPayloadReg(reg, loc->payloadType());return;}}// Not enough registers available, spill to the stack.spillOperandToStack(masm, loc);}void CacheRegisterAllocator::popPayload(MacroAssembler& masm,OperandLocation* loc, Register dest) {MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());MOZ_ASSERT(stackPushed_ >= sizeof(uintptr_t));// The payload is on the stack. If it's on top of the stack we can just// pop it, else we emit a load.if (loc->payloadStack() == stackPushed_) {masm.pop(dest);stackPushed_ -= sizeof(uintptr_t);} else {MOZ_ASSERT(loc->payloadStack() < stackPushed_);masm.loadPtr(Address(masm.getStackPointer(), stackPushed_ - loc->payloadStack()),dest);masm.propagateOOM(freePayloadSlots_.append(loc->payloadStack()));}loc->setPayloadReg(dest, loc->payloadType());}Address CacheRegisterAllocator::valueAddress(MacroAssembler& masm,OperandLocation* loc) {MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());return Address(masm.getStackPointer(), stackPushed_ - loc->valueStack());}void CacheRegisterAllocator::popValue(MacroAssembler& masm,OperandLocation* loc, ValueOperand dest) {MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());MOZ_ASSERT(stackPushed_ >= sizeof(js::Value));// The Value is on the stack. If it's on top of the stack we can just// pop it, else we emit a load.if (loc->valueStack() == stackPushed_) {masm.popValue(dest);stackPushed_ -= sizeof(js::Value);} else {MOZ_ASSERT(loc->valueStack() < stackPushed_);masm.loadValue(Address(masm.getStackPointer(), stackPushed_ - loc->valueStack()),dest);masm.propagateOOM(freeValueSlots_.append(loc->valueStack()));}loc->setValueReg(dest);}#ifdef DEBUGvoid CacheRegisterAllocator::assertValidState() const {// Assert different operands don't have aliasing storage. We depend on this// when spilling registers, for instance.if (!JitOptions.fullDebugChecks) {return;}for (size_t i = 0; i < operandLocations_.length(); i++) {const auto& loc1 = operandLocations_[i];if (loc1.isUninitialized()) {continue;}for (size_t j = 0; j < i; j++) {const auto& loc2 = operandLocations_[j];if (loc2.isUninitialized()) {continue;}MOZ_ASSERT(!loc1.aliasesReg(loc2));}}}#endifbool OperandLocation::aliasesReg(const OperandLocation& other) const {MOZ_ASSERT(&other != this);switch (other.kind_) {case PayloadReg:return aliasesReg(other.payloadReg());case ValueReg:return aliasesReg(other.valueReg());case PayloadStack:case ValueStack:case BaselineFrame:case Constant:case DoubleReg:return false;case Uninitialized:break;}MOZ_CRASH("Invalid kind");}void CacheRegisterAllocator::restoreInputState(MacroAssembler& masm,bool shouldDiscardStack) {size_t numInputOperands = origInputLocations_.length();MOZ_ASSERT(writer_.numInputOperands() == numInputOperands);for (size_t j = 0; j < numInputOperands; j++) {const OperandLocation& dest = origInputLocations_[j];OperandLocation& cur = operandLocations_[j];if (dest == cur) {continue;}auto autoAssign = mozilla::MakeScopeExit([&] { cur = dest; });// We have a cycle if a destination register will be used later// as source register. If that happens, just push the current value// on the stack and later get it from there.for (size_t k = j + 1; k < numInputOperands; k++) {OperandLocation& laterSource = operandLocations_[k];if (dest.aliasesReg(laterSource)) {spillOperandToStack(masm, &laterSource);}}if (dest.kind() == OperandLocation::ValueReg) {// We have to restore a Value register.switch (cur.kind()) {case OperandLocation::ValueReg:masm.moveValue(cur.valueReg(), dest.valueReg());continue;case OperandLocation::PayloadReg:masm.tagValue(cur.payloadType(), cur.payloadReg(), dest.valueReg());continue;case OperandLocation::PayloadStack: {Register scratch = dest.valueReg().scratchReg();popPayload(masm, &cur, scratch);masm.tagValue(cur.payloadType(), scratch, dest.valueReg());continue;}case OperandLocation::ValueStack:popValue(masm, &cur, dest.valueReg());continue;case OperandLocation::DoubleReg:masm.boxDouble(cur.doubleReg(), dest.valueReg(), cur.doubleReg());continue;case OperandLocation::Constant:case OperandLocation::BaselineFrame:case OperandLocation::Uninitialized:break;}} else if (dest.kind() == OperandLocation::PayloadReg) {// We have to restore a payload register.switch (cur.kind()) {case OperandLocation::ValueReg:MOZ_ASSERT(dest.payloadType() != JSVAL_TYPE_DOUBLE);masm.unboxNonDouble(cur.valueReg(), dest.payloadReg(),dest.payloadType());continue;case OperandLocation::PayloadReg:MOZ_ASSERT(cur.payloadType() == dest.payloadType());masm.mov(cur.payloadReg(), dest.payloadReg());continue;case OperandLocation::PayloadStack: {MOZ_ASSERT(cur.payloadType() == dest.payloadType());popPayload(masm, &cur, dest.payloadReg());continue;}case OperandLocation::ValueStack:MOZ_ASSERT(stackPushed_ >= sizeof(js::Value));MOZ_ASSERT(cur.valueStack() <= stackPushed_);MOZ_ASSERT(dest.payloadType() != JSVAL_TYPE_DOUBLE);masm.unboxNonDouble(Address(masm.getStackPointer(), stackPushed_ - cur.valueStack()),dest.payloadReg(), dest.payloadType());continue;case OperandLocation::Constant:case OperandLocation::BaselineFrame:case OperandLocation::DoubleReg:case OperandLocation::Uninitialized:break;}} else if (dest.kind() == OperandLocation::Constant \|\|dest.kind() == OperandLocation::BaselineFrame \|\|dest.kind() == OperandLocation::DoubleReg) {// Nothing to do.continue;}MOZ_CRASH("Invalid kind");}for (const SpilledRegister& spill : spilledRegs_) {MOZ_ASSERT(stackPushed_ >= sizeof(uintptr_t));if (spill.stackPushed == stackPushed_) {masm.pop(spill.reg);stackPushed_ -= sizeof(uintptr_t);} else {MOZ_ASSERT(spill.stackPushed < stackPushed_);masm.loadPtr(Address(masm.getStackPointer(), stackPushed_ - spill.stackPushed),spill.reg);}}if (shouldDiscardStack) {discardStack(masm);}}size_t CacheIRStubInfo::stubDataSize() const {size_t field = 0;size_t size = 0;while (true) {StubField::Type type = fieldType(field++);if (type == StubField::Type::Limit) {return size;}size += StubField::sizeInBytes(type);}}template <typename T>static GCPtr<T>* AsGCPtr(uintptr_t* ptr) {return reinterpret_cast<GCPtr<T>>(ptr);}uintptr_t CacheIRStubInfo::getStubRawWord(ICStub stub, uint32_t offset) const {uint8_t* stubData = (uint8_t)stub + stubDataOffset_;MOZ_ASSERT(uintptr_t(stubData) % sizeof(uintptr_t) == 0);return (uintptr_t)(stubData + offset);}template <class Stub, class T>GCPtr<T>& CacheIRStubInfo::getStubField(Stub stub, uint32_t offset) const {uint8_t* stubData = (uint8_t)stub + stubDataOffset_;MOZ_ASSERT(uintptr_t(stubData) % sizeof(uintptr_t) == 0);return AsGCPtr<T>((uintptr_t)(stubData + offset));}template GCPtr<Shape>& CacheIRStubInfo::getStubField<ICStub>(ICStub* stub, uint32_t offset) const;template GCPtr<ObjectGroup>& CacheIRStubInfo::getStubField<ICStub>(ICStub stub, uint32_t offset) const;template GCPtr<JSObject>& CacheIRStubInfo::getStubField<ICStub>(ICStub stub, uint32_t offset) const;template GCPtr<JSString>& CacheIRStubInfo::getStubField<ICStub>(ICStub stub, uint32_t offset) const;template GCPtr<JS::Symbol>& CacheIRStubInfo::getStubField<ICStub>(ICStub stub, uint32_t offset) const;template GCPtr<JS::Value>& CacheIRStubInfo::getStubField<ICStub>(ICStub* stub, uint32_t offset) const;template GCPtr<jsid>& CacheIRStubInfo::getStubField<ICStub>(ICStub* stub, uint32_t offset) const;template <typename T, typename V>static void InitGCPtr(uintptr_t* ptr, V val) {AsGCPtr<T>(ptr)->init(mozilla::BitwiseCast<T>(val));}void CacheIRWriter::copyStubData(uint8_t* dest) const {MOZ_ASSERT(!failed());uintptr_t* destWords = reinterpret_cast<uintptr_t>(dest);for (const StubField& field : stubFields_) {switch (field.type()) {case StubField::Type::RawWord:destWords = field.asWord();break;case StubField::Type::Shape:InitGCPtr<Shape>(destWords, field.asWord());break;case StubField::Type::JSObject:InitGCPtr<JSObject>(destWords, field.asWord());break;case StubField::Type::ObjectGroup:InitGCPtr<ObjectGroup>(destWords, field.asWord());break;case StubField::Type::Symbol:InitGCPtr<JS::Symbol>(destWords, field.asWord());break;case StubField::Type::String:InitGCPtr<JSString>(destWords, field.asWord());break;case StubField::Type::Id:AsGCPtr<jsid>(destWords)->init(jsid::fromRawBits(field.asWord()));break;case StubField::Type::RawInt64:case StubField::Type::DOMExpandoGeneration:reinterpret_cast<uint64_t>(destWords) = field.asInt64();break;case StubField::Type::Value:AsGCPtr<Value>(destWords)->init(Value::fromRawBits(uint64_t(field.asInt64())));break;case StubField::Type::Limit:MOZ_CRASH("Invalid type");}destWords += StubField::sizeInBytes(field.type()) / sizeof(uintptr_t);}}template <typename T>void jit::TraceCacheIRStub(JSTracer trc, T* stub,const CacheIRStubInfo* stubInfo) {uint32_t field = 0;size_t offset = 0;while (true) {StubField::Type fieldType = stubInfo->fieldType(field);switch (fieldType) {case StubField::Type::RawWord:case StubField::Type::RawInt64:case StubField::Type::DOMExpandoGeneration:break;case StubField::Type::Shape:TraceNullableEdge(trc, &stubInfo->getStubField<T, Shape>(stub, offset),"cacheir-shape");break;case StubField::Type::ObjectGroup:TraceNullableEdge(trc, &stubInfo->getStubField<T, ObjectGroup>(stub, offset),"cacheir-group");break;case StubField::Type::JSObject:TraceNullableEdge(trc,&stubInfo->getStubField<T, JSObject>(stub, offset),"cacheir-object");break;case StubField::Type::Symbol:TraceNullableEdge(trc,&stubInfo->getStubField<T, JS::Symbol>(stub, offset),"cacheir-symbol");break;case StubField::Type::String:TraceNullableEdge(trc,&stubInfo->getStubField<T, JSString>(stub, offset),"cacheir-string");break;case StubField::Type::Id:TraceEdge(trc, &stubInfo->getStubField<T, jsid>(stub, offset),"cacheir-id");break;case StubField::Type::Value:TraceEdge(trc, &stubInfo->getStubField<T, JS::Value>(stub, offset),"cacheir-value");break;case StubField::Type::Limit:return; // Done.}field++;offset += StubField::sizeInBytes(fieldType);}}template void jit::TraceCacheIRStub(JSTracer trc, ICStub* stub,const CacheIRStubInfo* stubInfo);template void jit::TraceCacheIRStub(JSTracer* trc, IonICStub* stub,const CacheIRStubInfo* stubInfo);bool CacheIRWriter::stubDataEqualsMaybeUpdate(uint8_t* stubData,bool* updated) const {MOZ_ASSERT(!failed());updated = false;const uintptr_t stubDataWords = reinterpret_cast<const uintptr_t>(stubData);// If DOMExpandoGeneration fields are different but all other stub fields// are exactly the same, we overwrite the old stub data instead of attaching// a new stub, as the old stub is never going to succeed. This works because// even Ion stubs read the DOMExpandoGeneration field from the stub instead// of baking it in.bool expandoGenerationIsDifferent = false;for (const StubField& field : stubFields_) {if (field.sizeIsWord()) {if (field.asWord() != stubDataWords) {return false;}stubDataWords++;continue;}if (field.asInt64() != reinterpret_cast<const uint64_t>(stubDataWords)) {if (field.type() != StubField::Type::DOMExpandoGeneration) {return false;}expandoGenerationIsDifferent = true;}` `stubDataWords +=`

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "jit/CacheIRCompiler.h"

#include "mozilla/ArrayUtils.h"
#include "mozilla/ScopeExit.h"

#include <utility>

#include "jslibmath.h"
#include "jit/IonIC.h"
#include "jit/SharedICHelpers.h"
#include "jit/SharedICRegisters.h"
#include "vm/GeneratorObject.h"

#include "builtin/Boolean-inl.h"

#include "jit/MacroAssembler-inl.h"
#include "vm/Realm-inl.h"

using namespace js;
using namespace js::jit;

using mozilla::BitwiseCast;
using mozilla::Maybe;

ValueOperand CacheRegisterAllocator::useValueRegister(MacroAssembler& masm,
                                                      ValOperandId op) {
  OperandLocation& loc = operandLocations_[op.id()];

  switch (loc.kind()) {
    case OperandLocation::ValueReg:
      currentOpRegs_.add(loc.valueReg());
      return loc.valueReg();

    case OperandLocation::ValueStack: {
      ValueOperand reg = allocateValueRegister(masm);
      popValue(masm, &loc, reg);
      return reg;
    }

    case OperandLocation::BaselineFrame: {
      ValueOperand reg = allocateValueRegister(masm);
      Address addr = addressOf(masm, loc.baselineFrameSlot());
      masm.loadValue(addr, reg);
      loc.setValueReg(reg);
      return reg;
    }

    case OperandLocation::Constant: {
      ValueOperand reg = allocateValueRegister(masm);
      masm.moveValue(loc.constant(), reg);
      loc.setValueReg(reg);
      return reg;
    }

    case OperandLocation::PayloadReg: {
      // Temporarily add the payload register to currentOpRegs_ so
      // allocateValueRegister will stay away from it.
      currentOpRegs_.add(loc.payloadReg());
      ValueOperand reg = allocateValueRegister(masm);
      masm.tagValue(loc.payloadType(), loc.payloadReg(), reg);
      currentOpRegs_.take(loc.payloadReg());
      availableRegs_.add(loc.payloadReg());
      loc.setValueReg(reg);
      return reg;
    }

    case OperandLocation::PayloadStack: {
      ValueOperand reg = allocateValueRegister(masm);
      popPayload(masm, &loc, reg.scratchReg());
      masm.tagValue(loc.payloadType(), reg.scratchReg(), reg);
      loc.setValueReg(reg);
      return reg;
    }

    case OperandLocation::DoubleReg: {
      ValueOperand reg = allocateValueRegister(masm);
      masm.boxDouble(loc.doubleReg(), reg, ScratchDoubleReg);
      loc.setValueReg(reg);
      return reg;
    }

    case OperandLocation::Uninitialized:
      break;
  }

  MOZ_CRASH();
}

// Load a value operand directly into a float register. Caller must have
// guarded isNumber on the provided val.
void CacheRegisterAllocator::ensureDoubleRegister(MacroAssembler& masm,
                                                  ValOperandId op,
                                                  FloatRegister dest) {
  OperandLocation& loc = operandLocations_[op.id()];

  Label failure, done;
  switch (loc.kind()) {
    case OperandLocation::ValueReg: {
      masm.ensureDouble(loc.valueReg(), dest, &failure);
      break;
    }

    case OperandLocation::ValueStack: {
      masm.ensureDouble(valueAddress(masm, &loc), dest, &failure);
      break;
    }

    case OperandLocation::BaselineFrame: {
      Address addr = addressOf(masm, loc.baselineFrameSlot());
      masm.ensureDouble(addr, dest, &failure);
      break;
    }

    case OperandLocation::DoubleReg: {
      masm.moveDouble(loc.doubleReg(), dest);
      loc.setDoubleReg(dest);
      return;
    }

    case OperandLocation::Constant:
    case OperandLocation::PayloadStack:
    case OperandLocation::PayloadReg:
    case OperandLocation::Uninitialized:
      MOZ_CRASH("Unhandled operand type in ensureDoubleRegister");
      return;
  }
  masm.jump(&done);
  masm.bind(&failure);
  masm.assumeUnreachable(
      "Missing guard allowed non-number to hit ensureDoubleRegister");
  masm.bind(&done);
}

ValueOperand CacheRegisterAllocator::useFixedValueRegister(MacroAssembler& masm,
                                                           ValOperandId valId,
                                                           ValueOperand reg) {
  allocateFixedValueRegister(masm, reg);

  OperandLocation& loc = operandLocations_[valId.id()];
  switch (loc.kind()) {
    case OperandLocation::ValueReg:
      masm.moveValue(loc.valueReg(), reg);
      MOZ_ASSERT(!currentOpRegs_.aliases(loc.valueReg()),
                 "Register shouldn't be in use");
      availableRegs_.add(loc.valueReg());
      break;
    case OperandLocation::ValueStack:
      popValue(masm, &loc, reg);
      break;
    case OperandLocation::BaselineFrame: {
      Address addr = addressOf(masm, loc.baselineFrameSlot());
      masm.loadValue(addr, reg);
      break;
    }
    case OperandLocation::Constant:
      masm.moveValue(loc.constant(), reg);
      break;
    case OperandLocation::PayloadReg:
      masm.tagValue(loc.payloadType(), loc.payloadReg(), reg);
      MOZ_ASSERT(!currentOpRegs_.has(loc.payloadReg()),
                 "Register shouldn't be in use");
      availableRegs_.add(loc.payloadReg());
      break;
    case OperandLocation::PayloadStack:
      popPayload(masm, &loc, reg.scratchReg());
      masm.tagValue(loc.payloadType(), reg.scratchReg(), reg);
      break;
    case OperandLocation::DoubleReg:
      masm.boxDouble(loc.doubleReg(), reg, ScratchDoubleReg);
      break;
    case OperandLocation::Uninitialized:
      MOZ_CRASH();
  }

  loc.setValueReg(reg);
  return reg;
}

Register CacheRegisterAllocator::useRegister(MacroAssembler& masm,
                                             TypedOperandId typedId) {
  MOZ_ASSERT(!addedFailurePath_);

  OperandLocation& loc = operandLocations_[typedId.id()];
  switch (loc.kind()) {
    case OperandLocation::PayloadReg:
      currentOpRegs_.add(loc.payloadReg());
      return loc.payloadReg();

    case OperandLocation::ValueReg: {
      // It's possible the value is still boxed: as an optimization, we unbox
      // the first time we use a value as object.
      ValueOperand val = loc.valueReg();
      availableRegs_.add(val);
      Register reg = val.scratchReg();
      availableRegs_.take(reg);
      masm.unboxNonDouble(val, reg, typedId.type());
      loc.setPayloadReg(reg, typedId.type());
      currentOpRegs_.add(reg);
      return reg;
    }

    case OperandLocation::PayloadStack: {
      Register reg = allocateRegister(masm);
      popPayload(masm, &loc, reg);
      return reg;
    }

    case OperandLocation::ValueStack: {
      // The value is on the stack, but boxed. If it's on top of the stack we
      // unbox it and then remove it from the stack, else we just unbox.
      Register reg = allocateRegister(masm);
      if (loc.valueStack() == stackPushed_) {
        masm.unboxNonDouble(Address(masm.getStackPointer(), 0), reg,
                            typedId.type());
        masm.addToStackPtr(Imm32(sizeof(js::Value)));
        MOZ_ASSERT(stackPushed_ >= sizeof(js::Value));
        stackPushed_ -= sizeof(js::Value);
      } else {
        MOZ_ASSERT(loc.valueStack() < stackPushed_);
        masm.unboxNonDouble(
            Address(masm.getStackPointer(), stackPushed_ - loc.valueStack()),
            reg, typedId.type());
      }
      loc.setPayloadReg(reg, typedId.type());
      return reg;
    }

    case OperandLocation::BaselineFrame: {
      Register reg = allocateRegister(masm);
      Address addr = addressOf(masm, loc.baselineFrameSlot());
      masm.unboxNonDouble(addr, reg, typedId.type());
      loc.setPayloadReg(reg, typedId.type());
      return reg;
    };

    case OperandLocation::Constant: {
      Value v = loc.constant();
      Register reg = allocateRegister(masm);
      if (v.isString()) {
        masm.movePtr(ImmGCPtr(v.toString()), reg);
      } else if (v.isSymbol()) {
        masm.movePtr(ImmGCPtr(v.toSymbol()), reg);
      } else {
        MOZ_CRASH("Unexpected Value");
      }
      loc.setPayloadReg(reg, v.extractNonDoubleType());
      return reg;
    }

    case OperandLocation::DoubleReg:
    case OperandLocation::Uninitialized:
      break;
  }

  MOZ_CRASH();
}

ConstantOrRegister CacheRegisterAllocator::useConstantOrRegister(
    MacroAssembler& masm, ValOperandId val) {
  MOZ_ASSERT(!addedFailurePath_);

  OperandLocation& loc = operandLocations_[val.id()];
  switch (loc.kind()) {
    case OperandLocation::Constant:
      return loc.constant();

    case OperandLocation::PayloadReg:
    case OperandLocation::PayloadStack: {
      JSValueType payloadType = loc.payloadType();
      Register reg = useRegister(masm, TypedOperandId(val, payloadType));
      return TypedOrValueRegister(MIRTypeFromValueType(payloadType),
                                  AnyRegister(reg));
    }

    case OperandLocation::ValueReg:
    case OperandLocation::ValueStack:
    case OperandLocation::BaselineFrame:
      return TypedOrValueRegister(useValueRegister(masm, val));

    case OperandLocation::DoubleReg:
      return TypedOrValueRegister(MIRType::Double,
                                  AnyRegister(loc.doubleReg()));

    case OperandLocation::Uninitialized:
      break;
  }

  MOZ_CRASH();
}

Register CacheRegisterAllocator::defineRegister(MacroAssembler& masm,
                                                TypedOperandId typedId) {
  MOZ_ASSERT(!addedFailurePath_);

  OperandLocation& loc = operandLocations_[typedId.id()];
  MOZ_ASSERT(loc.kind() == OperandLocation::Uninitialized);

  Register reg = allocateRegister(masm);
  loc.setPayloadReg(reg, typedId.type());
  return reg;
}

ValueOperand CacheRegisterAllocator::defineValueRegister(MacroAssembler& masm,
                                                         ValOperandId val) {
  MOZ_ASSERT(!addedFailurePath_);

  OperandLocation& loc = operandLocations_[val.id()];
  MOZ_ASSERT(loc.kind() == OperandLocation::Uninitialized);

  ValueOperand reg = allocateValueRegister(masm);
  loc.setValueReg(reg);
  return reg;
}

void CacheRegisterAllocator::freeDeadOperandLocations(MacroAssembler& masm) {
  // See if any operands are dead so we can reuse their registers. Note that
  // we skip the input operands, as those are also used by failure paths, and
  // we currently don't track those uses.
  for (size_t i = writer_.numInputOperands(); i < operandLocations_.length();
       i++) {
    if (!writer_.operandIsDead(i, currentInstruction_)) {
      continue;
    }

    OperandLocation& loc = operandLocations_[i];
    switch (loc.kind()) {
      case OperandLocation::PayloadReg:
        availableRegs_.add(loc.payloadReg());
        break;
      case OperandLocation::ValueReg:
        availableRegs_.add(loc.valueReg());
        break;
      case OperandLocation::PayloadStack:
        masm.propagateOOM(freePayloadSlots_.append(loc.payloadStack()));
        break;
      case OperandLocation::ValueStack:
        masm.propagateOOM(freeValueSlots_.append(loc.valueStack()));
        break;
      case OperandLocation::Uninitialized:
      case OperandLocation::BaselineFrame:
      case OperandLocation::Constant:
      case OperandLocation::DoubleReg:
        break;
    }
    loc.setUninitialized();
  }
}

void CacheRegisterAllocator::discardStack(MacroAssembler& masm) {
  // This should only be called when we are no longer using the operands,
  // as we're discarding everything from the native stack. Set all operand
  // locations to Uninitialized to catch bugs.
  for (size_t i = 0; i < operandLocations_.length(); i++) {
    operandLocations_[i].setUninitialized();
  }

  if (stackPushed_ > 0) {
    masm.addToStackPtr(Imm32(stackPushed_));
    stackPushed_ = 0;
  }
  freePayloadSlots_.clear();
  freeValueSlots_.clear();
}

Register CacheRegisterAllocator::allocateRegister(MacroAssembler& masm) {
  MOZ_ASSERT(!addedFailurePath_);

  if (availableRegs_.empty()) {
    freeDeadOperandLocations(masm);
  }

  if (availableRegs_.empty()) {
    // Still no registers available, try to spill unused operands to
    // the stack.
    for (size_t i = 0; i < operandLocations_.length(); i++) {
      OperandLocation& loc = operandLocations_[i];
      if (loc.kind() == OperandLocation::PayloadReg) {
        Register reg = loc.payloadReg();
        if (currentOpRegs_.has(reg)) {
          continue;
        }

        spillOperandToStack(masm, &loc);
        availableRegs_.add(reg);
        break;  // We got a register, so break out of the loop.
      }
      if (loc.kind() == OperandLocation::ValueReg) {
        ValueOperand reg = loc.valueReg();
        if (currentOpRegs_.aliases(reg)) {
          continue;
        }

        spillOperandToStack(masm, &loc);
        availableRegs_.add(reg);
        break;  // Break out of the loop.
      }
    }
  }

  if (availableRegs_.empty() && !availableRegsAfterSpill_.empty()) {
    Register reg = availableRegsAfterSpill_.takeAny();
    masm.push(reg);
    stackPushed_ += sizeof(uintptr_t);

    masm.propagateOOM(spilledRegs_.append(SpilledRegister(reg, stackPushed_)));

    availableRegs_.add(reg);
  }

  // At this point, there must be a free register.
  MOZ_RELEASE_ASSERT(!availableRegs_.empty());

  Register reg = availableRegs_.takeAny();
  currentOpRegs_.add(reg);
  return reg;
}

void CacheRegisterAllocator::allocateFixedRegister(MacroAssembler& masm,
                                                   Register reg) {
  MOZ_ASSERT(!addedFailurePath_);

  // Fixed registers should be allocated first, to ensure they're
  // still available.
  MOZ_ASSERT(!currentOpRegs_.has(reg), "Register is in use");

  freeDeadOperandLocations(masm);

  if (availableRegs_.has(reg)) {
    availableRegs_.take(reg);
    currentOpRegs_.add(reg);
    return;
  }

  // Register may be available only after spilling contents.
  if (availableRegsAfterSpill_.has(reg)) {
    availableRegsAfterSpill_.take(reg);
    masm.push(reg);
    stackPushed_ += sizeof(uintptr_t);

    masm.propagateOOM(spilledRegs_.append(SpilledRegister(reg, stackPushed_)));
    currentOpRegs_.add(reg);
    return;
  }

  // The register must be used by some operand. Spill it to the stack.
  for (size_t i = 0; i < operandLocations_.length(); i++) {
    OperandLocation& loc = operandLocations_[i];
    if (loc.kind() == OperandLocation::PayloadReg) {
      if (loc.payloadReg() != reg) {
        continue;
      }

      spillOperandToStackOrRegister(masm, &loc);
      currentOpRegs_.add(reg);
      return;
    }
    if (loc.kind() == OperandLocation::ValueReg) {
      if (!loc.valueReg().aliases(reg)) {
        continue;
      }

      ValueOperand valueReg = loc.valueReg();
      spillOperandToStackOrRegister(masm, &loc);

      availableRegs_.add(valueReg);
      availableRegs_.take(reg);
      currentOpRegs_.add(reg);
      return;
    }
  }

  MOZ_CRASH("Invalid register");
}

void CacheRegisterAllocator::allocateFixedValueRegister(MacroAssembler& masm,
                                                        ValueOperand reg) {
#ifdef JS_NUNBOX32
  allocateFixedRegister(masm, reg.payloadReg());
  allocateFixedRegister(masm, reg.typeReg());
#else
  allocateFixedRegister(masm, reg.valueReg());
#endif
}

ValueOperand CacheRegisterAllocator::allocateValueRegister(
    MacroAssembler& masm) {
#ifdef JS_NUNBOX32
  Register reg1 = allocateRegister(masm);
  Register reg2 = allocateRegister(masm);
  return ValueOperand(reg1, reg2);
#else
  Register reg = allocateRegister(masm);
  return ValueOperand(reg);
#endif
}

bool CacheRegisterAllocator::init() {
  if (!origInputLocations_.resize(writer_.numInputOperands())) {
    return false;
  }
  if (!operandLocations_.resize(writer_.numOperandIds())) {
    return false;
  }
  return true;
}

void CacheRegisterAllocator::initAvailableRegsAfterSpill() {
  // Registers not in availableRegs_ and not used by input operands are
  // available after being spilled.
  availableRegsAfterSpill_.set() = GeneralRegisterSet::Intersect(
      GeneralRegisterSet::Not(availableRegs_.set()),
      GeneralRegisterSet::Not(inputRegisterSet()));
}

void CacheRegisterAllocator::fixupAliasedInputs(MacroAssembler& masm) {
  // If IC inputs alias each other, make sure they are stored in different
  // locations so we don't have to deal with this complexity in the rest of
  // the allocator.
  //
  // Note that this can happen in IonMonkey with something like |o.foo = o|
  // or |o[i] = i|.

  size_t numInputs = writer_.numInputOperands();
  MOZ_ASSERT(origInputLocations_.length() == numInputs);

  for (size_t i = 1; i < numInputs; i++) {
    OperandLocation& loc1 = operandLocations_[i];
    if (!loc1.isInRegister()) {
      continue;
    }

    for (size_t j = 0; j < i; j++) {
      OperandLocation& loc2 = operandLocations_[j];
      if (!loc1.aliasesReg(loc2)) {
        continue;
      }

      // loc1 and loc2 alias so we spill one of them. If one is a
      // ValueReg and the other is a PayloadReg, we have to spill the
      // PayloadReg: spilling the ValueReg instead would leave its type
      // register unallocated on 32-bit platforms.
      if (loc1.kind() == OperandLocation::ValueReg) {
        spillOperandToStack(masm, &loc2);
      } else {
        MOZ_ASSERT(loc1.kind() == OperandLocation::PayloadReg);
        spillOperandToStack(masm, &loc1);
        break;  // Spilled loc1, so nothing else will alias it.
      }
    }
  }

#ifdef DEBUG
  assertValidState();
#endif
}

GeneralRegisterSet CacheRegisterAllocator::inputRegisterSet() const {
  MOZ_ASSERT(origInputLocations_.length() == writer_.numInputOperands());

  AllocatableGeneralRegisterSet result;
  for (size_t i = 0; i < writer_.numInputOperands(); i++) {
    const OperandLocation& loc = operandLocations_[i];
    MOZ_ASSERT(loc == origInputLocations_[i]);

    switch (loc.kind()) {
      case OperandLocation::PayloadReg:
        result.addUnchecked(loc.payloadReg());
        continue;
      case OperandLocation::ValueReg:
        result.addUnchecked(loc.valueReg());
        continue;
      case OperandLocation::PayloadStack:
      case OperandLocation::ValueStack:
      case OperandLocation::BaselineFrame:
      case OperandLocation::Constant:
      case OperandLocation::DoubleReg:
        continue;
      case OperandLocation::Uninitialized:
        break;
    }
    MOZ_CRASH("Invalid kind");
  }

  return result.set();
}

JSValueType CacheRegisterAllocator::knownType(ValOperandId val) const {
  const OperandLocation& loc = operandLocations_[val.id()];

  switch (loc.kind()) {
    case OperandLocation::ValueReg:
    case OperandLocation::ValueStack:
    case OperandLocation::BaselineFrame:
      return JSVAL_TYPE_UNKNOWN;

    case OperandLocation::PayloadStack:
    case OperandLocation::PayloadReg:
      return loc.payloadType();

    case OperandLocation::Constant:
      return loc.constant().isDouble() ? JSVAL_TYPE_DOUBLE
                                       : loc.constant().extractNonDoubleType();

    case OperandLocation::DoubleReg:
      return JSVAL_TYPE_DOUBLE;

    case OperandLocation::Uninitialized:
      break;
  }

  MOZ_CRASH("Invalid kind");
}

void CacheRegisterAllocator::initInputLocation(
    size_t i, const TypedOrValueRegister& reg) {
  if (reg.hasValue()) {
    initInputLocation(i, reg.valueReg());
  } else if (reg.typedReg().isFloat()) {
    MOZ_ASSERT(reg.type() == MIRType::Double);
    initInputLocation(i, reg.typedReg().fpu());
  } else {
    initInputLocation(i, reg.typedReg().gpr(),
                      ValueTypeFromMIRType(reg.type()));
  }
}

void CacheRegisterAllocator::initInputLocation(
    size_t i, const ConstantOrRegister& value) {
  if (value.constant()) {
    initInputLocation(i, value.value());
  } else {
    initInputLocation(i, value.reg());
  }
}

void CacheRegisterAllocator::spillOperandToStack(MacroAssembler& masm,
                                                 OperandLocation* loc) {
  MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());

  if (loc->kind() == OperandLocation::ValueReg) {
    if (!freeValueSlots_.empty()) {
      uint32_t stackPos = freeValueSlots_.popCopy();
      MOZ_ASSERT(stackPos <= stackPushed_);
      masm.storeValue(loc->valueReg(),
                      Address(masm.getStackPointer(), stackPushed_ - stackPos));
      loc->setValueStack(stackPos);
      return;
    }
    stackPushed_ += sizeof(js::Value);
    masm.pushValue(loc->valueReg());
    loc->setValueStack(stackPushed_);
    return;
  }

  MOZ_ASSERT(loc->kind() == OperandLocation::PayloadReg);

  if (!freePayloadSlots_.empty()) {
    uint32_t stackPos = freePayloadSlots_.popCopy();
    MOZ_ASSERT(stackPos <= stackPushed_);
    masm.storePtr(loc->payloadReg(),
                  Address(masm.getStackPointer(), stackPushed_ - stackPos));
    loc->setPayloadStack(stackPos, loc->payloadType());
    return;
  }
  stackPushed_ += sizeof(uintptr_t);
  masm.push(loc->payloadReg());
  loc->setPayloadStack(stackPushed_, loc->payloadType());
}

void CacheRegisterAllocator::spillOperandToStackOrRegister(
    MacroAssembler& masm, OperandLocation* loc) {
  MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());

  // If enough registers are available, use them.
  if (loc->kind() == OperandLocation::ValueReg) {
    static const size_t BoxPieces = sizeof(Value) / sizeof(uintptr_t);
    if (availableRegs_.set().size() >= BoxPieces) {
      ValueOperand reg = availableRegs_.takeAnyValue();
      masm.moveValue(loc->valueReg(), reg);
      loc->setValueReg(reg);
      return;
    }
  } else {
    MOZ_ASSERT(loc->kind() == OperandLocation::PayloadReg);
    if (!availableRegs_.empty()) {
      Register reg = availableRegs_.takeAny();
      masm.movePtr(loc->payloadReg(), reg);
      loc->setPayloadReg(reg, loc->payloadType());
      return;
    }
  }

  // Not enough registers available, spill to the stack.
  spillOperandToStack(masm, loc);
}

void CacheRegisterAllocator::popPayload(MacroAssembler& masm,
                                        OperandLocation* loc, Register dest) {
  MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());
  MOZ_ASSERT(stackPushed_ >= sizeof(uintptr_t));

  // The payload is on the stack. If it's on top of the stack we can just
  // pop it, else we emit a load.
  if (loc->payloadStack() == stackPushed_) {
    masm.pop(dest);
    stackPushed_ -= sizeof(uintptr_t);
  } else {
    MOZ_ASSERT(loc->payloadStack() < stackPushed_);
    masm.loadPtr(
        Address(masm.getStackPointer(), stackPushed_ - loc->payloadStack()),
        dest);
    masm.propagateOOM(freePayloadSlots_.append(loc->payloadStack()));
  }

  loc->setPayloadReg(dest, loc->payloadType());
}

Address CacheRegisterAllocator::valueAddress(MacroAssembler& masm,
                                             OperandLocation* loc) {
  MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());
  return Address(masm.getStackPointer(), stackPushed_ - loc->valueStack());
}

void CacheRegisterAllocator::popValue(MacroAssembler& masm,
                                      OperandLocation* loc, ValueOperand dest) {
  MOZ_ASSERT(loc >= operandLocations_.begin() && loc < operandLocations_.end());
  MOZ_ASSERT(stackPushed_ >= sizeof(js::Value));

  // The Value is on the stack. If it's on top of the stack we can just
  // pop it, else we emit a load.
  if (loc->valueStack() == stackPushed_) {
    masm.popValue(dest);
    stackPushed_ -= sizeof(js::Value);
  } else {
    MOZ_ASSERT(loc->valueStack() < stackPushed_);
    masm.loadValue(
        Address(masm.getStackPointer(), stackPushed_ - loc->valueStack()),
        dest);
    masm.propagateOOM(freeValueSlots_.append(loc->valueStack()));
  }

  loc->setValueReg(dest);
}

#ifdef DEBUG
void CacheRegisterAllocator::assertValidState() const {
  // Assert different operands don't have aliasing storage. We depend on this
  // when spilling registers, for instance.

  if (!JitOptions.fullDebugChecks) {
    return;
  }

  for (size_t i = 0; i < operandLocations_.length(); i++) {
    const auto& loc1 = operandLocations_[i];
    if (loc1.isUninitialized()) {
      continue;
    }

    for (size_t j = 0; j < i; j++) {
      const auto& loc2 = operandLocations_[j];
      if (loc2.isUninitialized()) {
        continue;
      }
      MOZ_ASSERT(!loc1.aliasesReg(loc2));
    }
  }
}
#endif

bool OperandLocation::aliasesReg(const OperandLocation& other) const {
  MOZ_ASSERT(&other != this);

  switch (other.kind_) {
    case PayloadReg:
      return aliasesReg(other.payloadReg());
    case ValueReg:
      return aliasesReg(other.valueReg());
    case PayloadStack:
    case ValueStack:
    case BaselineFrame:
    case Constant:
    case DoubleReg:
      return false;
    case Uninitialized:
      break;
  }

  MOZ_CRASH("Invalid kind");
}

void CacheRegisterAllocator::restoreInputState(MacroAssembler& masm,
                                               bool shouldDiscardStack) {
  size_t numInputOperands = origInputLocations_.length();
  MOZ_ASSERT(writer_.numInputOperands() == numInputOperands);

  for (size_t j = 0; j < numInputOperands; j++) {
    const OperandLocation& dest = origInputLocations_[j];
    OperandLocation& cur = operandLocations_[j];
    if (dest == cur) {
      continue;
    }

    auto autoAssign = mozilla::MakeScopeExit([&] { cur = dest; });

    // We have a cycle if a destination register will be used later
    // as source register. If that happens, just push the current value
    // on the stack and later get it from there.
    for (size_t k = j + 1; k < numInputOperands; k++) {
      OperandLocation& laterSource = operandLocations_[k];
      if (dest.aliasesReg(laterSource)) {
        spillOperandToStack(masm, &laterSource);
      }
    }

    if (dest.kind() == OperandLocation::ValueReg) {
      // We have to restore a Value register.
      switch (cur.kind()) {
        case OperandLocation::ValueReg:
          masm.moveValue(cur.valueReg(), dest.valueReg());
          continue;
        case OperandLocation::PayloadReg:
          masm.tagValue(cur.payloadType(), cur.payloadReg(), dest.valueReg());
          continue;
        case OperandLocation::PayloadStack: {
          Register scratch = dest.valueReg().scratchReg();
          popPayload(masm, &cur, scratch);
          masm.tagValue(cur.payloadType(), scratch, dest.valueReg());
          continue;
        }
        case OperandLocation::ValueStack:
          popValue(masm, &cur, dest.valueReg());
          continue;
        case OperandLocation::DoubleReg:
          masm.boxDouble(cur.doubleReg(), dest.valueReg(), cur.doubleReg());
          continue;
        case OperandLocation::Constant:
        case OperandLocation::BaselineFrame:
        case OperandLocation::Uninitialized:
          break;
      }
    } else if (dest.kind() == OperandLocation::PayloadReg) {
      // We have to restore a payload register.
      switch (cur.kind()) {
        case OperandLocation::ValueReg:
          MOZ_ASSERT(dest.payloadType() != JSVAL_TYPE_DOUBLE);
          masm.unboxNonDouble(cur.valueReg(), dest.payloadReg(),
                              dest.payloadType());
          continue;
        case OperandLocation::PayloadReg:
          MOZ_ASSERT(cur.payloadType() == dest.payloadType());
          masm.mov(cur.payloadReg(), dest.payloadReg());
          continue;
        case OperandLocation::PayloadStack: {
          MOZ_ASSERT(cur.payloadType() == dest.payloadType());
          popPayload(masm, &cur, dest.payloadReg());
          continue;
        }
        case OperandLocation::ValueStack:
          MOZ_ASSERT(stackPushed_ >= sizeof(js::Value));
          MOZ_ASSERT(cur.valueStack() <= stackPushed_);
          MOZ_ASSERT(dest.payloadType() != JSVAL_TYPE_DOUBLE);
          masm.unboxNonDouble(
              Address(masm.getStackPointer(), stackPushed_ - cur.valueStack()),
              dest.payloadReg(), dest.payloadType());
          continue;
        case OperandLocation::Constant:
        case OperandLocation::BaselineFrame:
        case OperandLocation::DoubleReg:
        case OperandLocation::Uninitialized:
          break;
      }
    } else if (dest.kind() == OperandLocation::Constant ||
               dest.kind() == OperandLocation::BaselineFrame ||
               dest.kind() == OperandLocation::DoubleReg) {
      // Nothing to do.
      continue;
    }

    MOZ_CRASH("Invalid kind");
  }

  for (const SpilledRegister& spill : spilledRegs_) {
    MOZ_ASSERT(stackPushed_ >= sizeof(uintptr_t));

    if (spill.stackPushed == stackPushed_) {
      masm.pop(spill.reg);
      stackPushed_ -= sizeof(uintptr_t);
    } else {
      MOZ_ASSERT(spill.stackPushed < stackPushed_);
      masm.loadPtr(
          Address(masm.getStackPointer(), stackPushed_ - spill.stackPushed),
          spill.reg);
    }
  }

  if (shouldDiscardStack) {
    discardStack(masm);
  }
}

size_t CacheIRStubInfo::stubDataSize() const {
  size_t field = 0;
  size_t size = 0;
  while (true) {
    StubField::Type type = fieldType(field++);
    if (type == StubField::Type::Limit) {
      return size;
    }
    size += StubField::sizeInBytes(type);
  }
}

template <typename T>
static GCPtr<T>* AsGCPtr(uintptr_t* ptr) {
  return reinterpret_cast<GCPtr<T>*>(ptr);
}

uintptr_t CacheIRStubInfo::getStubRawWord(ICStub* stub, uint32_t offset) const {
  uint8_t* stubData = (uint8_t*)stub + stubDataOffset_;
  MOZ_ASSERT(uintptr_t(stubData) % sizeof(uintptr_t) == 0);
  return *(uintptr_t*)(stubData + offset);
}

template <class Stub, class T>
GCPtr<T>& CacheIRStubInfo::getStubField(Stub* stub, uint32_t offset) const {
  uint8_t* stubData = (uint8_t*)stub + stubDataOffset_;
  MOZ_ASSERT(uintptr_t(stubData) % sizeof(uintptr_t) == 0);

  return *AsGCPtr<T>((uintptr_t*)(stubData + offset));
}

template GCPtr<Shape*>& CacheIRStubInfo::getStubField<ICStub>(
    ICStub* stub, uint32_t offset) const;
template GCPtr<ObjectGroup*>& CacheIRStubInfo::getStubField<ICStub>(
    ICStub* stub, uint32_t offset) const;
template GCPtr<JSObject*>& CacheIRStubInfo::getStubField<ICStub>(
    ICStub* stub, uint32_t offset) const;
template GCPtr<JSString*>& CacheIRStubInfo::getStubField<ICStub>(
    ICStub* stub, uint32_t offset) const;
template GCPtr<JS::Symbol*>& CacheIRStubInfo::getStubField<ICStub>(
    ICStub* stub, uint32_t offset) const;
template GCPtr<JS::Value>& CacheIRStubInfo::getStubField<ICStub>(
    ICStub* stub, uint32_t offset) const;
template GCPtr<jsid>& CacheIRStubInfo::getStubField<ICStub>(
    ICStub* stub, uint32_t offset) const;

template <typename T, typename V>
static void InitGCPtr(uintptr_t* ptr, V val) {
  AsGCPtr<T>(ptr)->init(mozilla::BitwiseCast<T>(val));
}

void CacheIRWriter::copyStubData(uint8_t* dest) const {
  MOZ_ASSERT(!failed());

  uintptr_t* destWords = reinterpret_cast<uintptr_t*>(dest);

  for (const StubField& field : stubFields_) {
    switch (field.type()) {
      case StubField::Type::RawWord:
        *destWords = field.asWord();
        break;
      case StubField::Type::Shape:
        InitGCPtr<Shape*>(destWords, field.asWord());
        break;
      case StubField::Type::JSObject:
        InitGCPtr<JSObject*>(destWords, field.asWord());
        break;
      case StubField::Type::ObjectGroup:
        InitGCPtr<ObjectGroup*>(destWords, field.asWord());
        break;
      case StubField::Type::Symbol:
        InitGCPtr<JS::Symbol*>(destWords, field.asWord());
        break;
      case StubField::Type::String:
        InitGCPtr<JSString*>(destWords, field.asWord());
        break;
      case StubField::Type::Id:
        AsGCPtr<jsid>(destWords)->init(jsid::fromRawBits(field.asWord()));
        break;
      case StubField::Type::RawInt64:
      case StubField::Type::DOMExpandoGeneration:
        *reinterpret_cast<uint64_t*>(destWords) = field.asInt64();
        break;
      case StubField::Type::Value:
        AsGCPtr<Value>(destWords)->init(
            Value::fromRawBits(uint64_t(field.asInt64())));
        break;
      case StubField::Type::Limit:
        MOZ_CRASH("Invalid type");
    }
    destWords += StubField::sizeInBytes(field.type()) / sizeof(uintptr_t);
  }
}

template <typename T>
void jit::TraceCacheIRStub(JSTracer* trc, T* stub,
                           const CacheIRStubInfo* stubInfo) {
  uint32_t field = 0;
  size_t offset = 0;
  while (true) {
    StubField::Type fieldType = stubInfo->fieldType(field);
    switch (fieldType) {
      case StubField::Type::RawWord:
      case StubField::Type::RawInt64:
      case StubField::Type::DOMExpandoGeneration:
        break;
      case StubField::Type::Shape:
        TraceNullableEdge(trc, &stubInfo->getStubField<T, Shape*>(stub, offset),
                          "cacheir-shape");
        break;
      case StubField::Type::ObjectGroup:
        TraceNullableEdge(
            trc, &stubInfo->getStubField<T, ObjectGroup*>(stub, offset),
            "cacheir-group");
        break;
      case StubField::Type::JSObject:
        TraceNullableEdge(trc,
                          &stubInfo->getStubField<T, JSObject*>(stub, offset),
                          "cacheir-object");
        break;
      case StubField::Type::Symbol:
        TraceNullableEdge(trc,
                          &stubInfo->getStubField<T, JS::Symbol*>(stub, offset),
                          "cacheir-symbol");
        break;
      case StubField::Type::String:
        TraceNullableEdge(trc,
                          &stubInfo->getStubField<T, JSString*>(stub, offset),
                          "cacheir-string");
        break;
      case StubField::Type::Id:
        TraceEdge(trc, &stubInfo->getStubField<T, jsid>(stub, offset),
                  "cacheir-id");
        break;
      case StubField::Type::Value:
        TraceEdge(trc, &stubInfo->getStubField<T, JS::Value>(stub, offset),
                  "cacheir-value");
        break;
      case StubField::Type::Limit:
        return;  // Done.
    }
    field++;
    offset += StubField::sizeInBytes(fieldType);
  }
}

template void jit::TraceCacheIRStub(JSTracer* trc, ICStub* stub,
                                    const CacheIRStubInfo* stubInfo);

template void jit::TraceCacheIRStub(JSTracer* trc, IonICStub* stub,
                                    const CacheIRStubInfo* stubInfo);

bool CacheIRWriter::stubDataEqualsMaybeUpdate(uint8_t* stubData,
                                              bool* updated) const {
  MOZ_ASSERT(!failed());

  *updated = false;
  const uintptr_t* stubDataWords = reinterpret_cast<const uintptr_t*>(stubData);

  // If DOMExpandoGeneration fields are different but all other stub fields
  // are exactly the same, we overwrite the old stub data instead of attaching
  // a new stub, as the old stub is never going to succeed. This works because
  // even Ion stubs read the DOMExpandoGeneration field from the stub instead
  // of baking it in.
  bool expandoGenerationIsDifferent = false;

  for (const StubField& field : stubFields_) {
    if (field.sizeIsWord()) {
      if (field.asWord() != *stubDataWords) {
        return false;
      }
      stubDataWords++;
      continue;
    }

    if (field.asInt64() != *reinterpret_cast<const uint64_t*>(stubDataWords)) {
      if (field.type() != StubField::Type::DOMExpandoGeneration) {
        return false;
      }
      expandoGenerationIsDifferent = true;
    }
    stubDataWords +=