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GlobOptFields.cpp
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//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
#include "Backend.h"
bool
GlobOpt::DoFieldCopyProp() const
{
BasicBlock *block = this->currentBlock;
Loop *loop = block->loop;
if (this->isRecursiveCallOnLandingPad)
{
// The landing pad at this point only contains load hosted by PRE.
// These need to be copy-prop'd into the loop.
// We want to look at the implicit-call info of the loop, not it's parent.
Assert(block->IsLandingPad());
loop = block->next->loop;
Assert(loop);
}
return DoFieldCopyProp(loop);
}
bool
GlobOpt::DoFunctionFieldCopyProp() const
{
return DoFieldCopyProp(nullptr);
}
bool
GlobOpt::DoFieldCopyProp(Loop * loop) const
{
if (PHASE_OFF(Js::CopyPropPhase, this->func))
{
// Can't do field copy prop without copy prop
return false;
}
if (PHASE_FORCE(Js::FieldCopyPropPhase, this->func))
{
// Force always turns on field copy prop
return true;
}
if (PHASE_OFF(Js::FieldCopyPropPhase, this->func))
{
return false;
}
return this->DoFieldOpts(loop);
}
bool
GlobOpt::DoObjTypeSpec() const
{
return this->DoObjTypeSpec(this->currentBlock->loop);
}
bool
GlobOpt::DoObjTypeSpec(Loop *loop) const
{
if (!this->func->DoFastPaths())
{
return false;
}
if (PHASE_FORCE(Js::ObjTypeSpecPhase, this->func))
{
return true;
}
if (PHASE_OFF(Js::ObjTypeSpecPhase, this->func))
{
return false;
}
if (this->func->IsLoopBody() && this->func->HasProfileInfo() && this->func->GetReadOnlyProfileInfo()->IsObjTypeSpecDisabledInJitLoopBody())
{
return false;
}
if (this->ImplicitCallFlagsAllowOpts(this->func))
{
Assert(loop == nullptr || loop->CanDoFieldCopyProp());
return true;
}
return loop != nullptr && loop->CanDoFieldCopyProp();
}
bool
GlobOpt::DoFieldOpts(Loop * loop) const
{
if (this->ImplicitCallFlagsAllowOpts(this->func))
{
Assert(loop == nullptr || loop->CanDoFieldCopyProp());
return true;
}
return loop != nullptr && loop->CanDoFieldCopyProp();
}
bool GlobOpt::DoFieldPRE() const
{
Loop *loop = this->currentBlock->loop;
return DoFieldPRE(loop);
}
bool
GlobOpt::DoFieldPRE(Loop *loop) const
{
if (PHASE_OFF(Js::FieldPREPhase, this->func))
{
return false;
}
if (PHASE_FORCE(Js::FieldPREPhase, func))
{
// Force always turns on field PRE
return true;
}
if (this->func->HasProfileInfo() && this->func->GetReadOnlyProfileInfo()->IsFieldPREDisabled())
{
return false;
}
return DoFieldOpts(loop);
}
bool GlobOpt::HasMemOp(Loop *loop)
{
#pragma prefast(suppress: 6285, "logical-or of constants is by design")
return (
loop &&
loop->doMemOp &&
(
!PHASE_OFF(Js::MemSetPhase, this->func) ||
!PHASE_OFF(Js::MemCopyPhase, this->func)
) &&
loop->memOpInfo &&
loop->memOpInfo->candidates &&
!loop->memOpInfo->candidates->Empty()
);
}
void
GlobOpt::KillLiveFields(StackSym * stackSym, BVSparse<JitArenaAllocator> * bv)
{
if (stackSym->IsTypeSpec())
{
stackSym = stackSym->GetVarEquivSym(this->func);
}
Assert(stackSym);
// If the sym has no objectSymInfo, it must not represent an object and, hence, has no type sym or
// property syms to kill.
if (!stackSym->HasObjectInfo() || stackSym->IsSingleDef())
{
return;
}
// Note that the m_writeGuardSym is killed here as well, because it is part of the
// m_propertySymList of the object.
ObjectSymInfo * objectSymInfo = stackSym->GetObjectInfo();
PropertySym * propertySym = objectSymInfo->m_propertySymList;
while (propertySym != nullptr)
{
Assert(propertySym->m_stackSym == stackSym);
bv->Clear(propertySym->m_id);
if (this->IsLoopPrePass())
{
for (Loop * loop = this->rootLoopPrePass; loop != nullptr; loop = loop->parent)
{
loop->fieldKilled->Set(propertySym->m_id);
}
}
else if (bv->IsEmpty())
{
// shortcut
break;
}
propertySym = propertySym->m_nextInStackSymList;
}
this->KillObjectType(stackSym, bv);
}
void
GlobOpt::KillLiveFields(PropertySym * propertySym, BVSparse<JitArenaAllocator> * bv)
{
KillLiveFields(propertySym->m_propertyEquivSet, bv);
}
void GlobOpt::KillLiveFields(BVSparse<JitArenaAllocator> *const fieldsToKill, BVSparse<JitArenaAllocator> *const bv) const
{
Assert(bv);
if (fieldsToKill)
{
bv->Minus(fieldsToKill);
if (this->IsLoopPrePass())
{
for (Loop * loop = this->rootLoopPrePass; loop != nullptr; loop = loop->parent)
{
loop->fieldKilled->Or(fieldsToKill);
}
}
}
}
void
GlobOpt::KillLiveElems(IR::IndirOpnd * indirOpnd, IR::Opnd * valueOpnd, BVSparse<JitArenaAllocator> * bv, bool inGlobOpt, Func *func)
{
IR::RegOpnd *indexOpnd = indirOpnd->GetIndexOpnd();
// obj.x = 10;
// obj["x"] = ...; // This needs to kill obj.x... We need to kill all fields...
//
// Also, 'arguments[i] =' needs to kill all slots even if 'i' is an int.
//
// NOTE: we only need to kill slots here, not all fields. It may be good to separate these one day.
//
// Regarding the check for type specialization:
// - Type specialization does not always update the value to a definite type.
// - The loop prepass is conservative on values even when type specialization occurs.
// - We check the type specialization status for the sym as well. For the purpose of doing kills, we can assume that
// if type specialization happened, that fields don't need to be killed. Note that they may be killed in the next
// pass based on the value.
bool isSafeToTransfer = true;
if (func->GetThisOrParentInlinerHasArguments() || this->IsNonNumericRegOpnd(indexOpnd, inGlobOpt, &isSafeToTransfer))
{
this->KillAllFields(bv); // This also kills all property type values, as the same bit-vector tracks those stack syms
SetAnyPropertyMayBeWrittenTo();
}
else if (inGlobOpt)
{
Value * indexValue = indexOpnd ? this->currentBlock->globOptData.FindValue(indexOpnd->GetSym()) : nullptr;
ValueInfo * indexValueInfo = indexValue ? indexValue->GetValueInfo() : nullptr;
int indexLowerBound = 0;
if (!isSafeToTransfer || indirOpnd->GetOffset() < 0 || (indexOpnd && (!indexValueInfo || !indexValueInfo->TryGetIntConstantLowerBound(&indexLowerBound, false) || indexLowerBound < 0)))
{
// Write/delete to a non-integer numeric index can't alias a name on the RHS of a dot, but it change object layout
this->KillAllObjectTypes(bv);
}
else if ((!valueOpnd || valueOpnd->IsVar()) && this->objectTypeSyms != nullptr)
{
// If we wind up converting a native array, block final-type opt at this point, because we could evolve
// to a type with the wrong type ID. Do this by noting that we may have evolved any type and so must
// check it before evolving it further.
IR::RegOpnd *baseOpnd = indirOpnd->GetBaseOpnd();
Value * baseValue = baseOpnd ? this->currentBlock->globOptData.FindValue(baseOpnd->m_sym) : nullptr;
ValueInfo * baseValueInfo = baseValue ? baseValue->GetValueInfo() : nullptr;
if (!baseValueInfo || !baseValueInfo->IsNotNativeArray() ||
(this->IsLoopPrePass() && !this->IsSafeToTransferInPrepass(baseOpnd->m_sym, baseValueInfo)))
{
if (this->currentBlock->globOptData.maybeWrittenTypeSyms == nullptr)
{
this->currentBlock->globOptData.maybeWrittenTypeSyms = JitAnew(this->alloc, BVSparse<JitArenaAllocator>, this->alloc);
}
this->currentBlock->globOptData.maybeWrittenTypeSyms->Or(this->objectTypeSyms);
}
}
}
}
void
GlobOpt::KillAllFields(BVSparse<JitArenaAllocator> * bv)
{
bv->ClearAll();
if (this->IsLoopPrePass())
{
for (Loop * loop = this->rootLoopPrePass; loop != nullptr; loop = loop->parent)
{
loop->allFieldsKilled = true;
}
}
}
void
GlobOpt::SetAnyPropertyMayBeWrittenTo()
{
this->func->anyPropertyMayBeWrittenTo = true;
}
void
GlobOpt::AddToPropertiesWrittenTo(Js::PropertyId propertyId)
{
this->func->EnsurePropertiesWrittenTo();
this->func->propertiesWrittenTo->Item(propertyId);
}
void
GlobOpt::ProcessFieldKills(IR::Instr *instr, BVSparse<JitArenaAllocator> *bv, bool inGlobOpt)
{
if (bv->IsEmpty() && (!this->IsLoopPrePass() || this->rootLoopPrePass->allFieldsKilled))
{
return;
}
if (instr->m_opcode == Js::OpCode::FromVar || instr->m_opcode == Js::OpCode::Conv_Prim)
{
return;
}
IR::Opnd * dstOpnd = instr->GetDst();
if (dstOpnd)
{
if (dstOpnd->IsRegOpnd())
{
Sym * sym = dstOpnd->AsRegOpnd()->m_sym;
if (sym->IsStackSym())
{
KillLiveFields(sym->AsStackSym(), bv);
}
}
else if (dstOpnd->IsSymOpnd())
{
Sym * sym = dstOpnd->AsSymOpnd()->m_sym;
if (sym->IsStackSym())
{
KillLiveFields(sym->AsStackSym(), bv);
}
else
{
Assert(sym->IsPropertySym());
if (instr->m_opcode == Js::OpCode::InitLetFld || instr->m_opcode == Js::OpCode::InitConstFld || instr->m_opcode == Js::OpCode::InitFld)
{
// These can grow the aux slot of the activation object.
// We need to kill the slot array sym as well.
PropertySym * slotArraySym = PropertySym::Find(sym->AsPropertySym()->m_stackSym->m_id,
(Js::DynamicObject::GetOffsetOfAuxSlots())/sizeof(Js::Var) /*, PropertyKindSlotArray */, instr->m_func);
if (slotArraySym)
{
bv->Clear(slotArraySym->m_id);
}
}
}
}
}
if (bv->IsEmpty() && (!this->IsLoopPrePass() || this->rootLoopPrePass->allFieldsKilled))
{
return;
}
Sym *sym;
IR::JnHelperMethod fnHelper;
switch(instr->m_opcode)
{
case Js::OpCode::StElemC:
case Js::OpCode::StElemI_A:
case Js::OpCode::StElemI_A_Strict:
Assert(dstOpnd != nullptr);
KillLiveFields(this->lengthEquivBv, bv);
KillLiveElems(dstOpnd->AsIndirOpnd(), instr->GetSrc1(), bv, inGlobOpt, instr->m_func);
if (inGlobOpt)
{
KillObjectHeaderInlinedTypeSyms(this->currentBlock, false);
}
break;
case Js::OpCode::InitComputedProperty:
case Js::OpCode::InitGetElemI:
case Js::OpCode::InitSetElemI:
KillLiveElems(dstOpnd->AsIndirOpnd(), instr->GetSrc1(), bv, inGlobOpt, instr->m_func);
if (inGlobOpt)
{
KillObjectHeaderInlinedTypeSyms(this->currentBlock, false);
}
break;
case Js::OpCode::DeleteElemI_A:
case Js::OpCode::DeleteElemIStrict_A:
Assert(dstOpnd != nullptr);
KillLiveElems(instr->GetSrc1()->AsIndirOpnd(), nullptr, bv, inGlobOpt, instr->m_func);
break;
case Js::OpCode::DeleteFld:
case Js::OpCode::DeleteRootFld:
case Js::OpCode::DeleteFldStrict:
case Js::OpCode::DeleteRootFldStrict:
case Js::OpCode::ScopedDeleteFld:
case Js::OpCode::ScopedDeleteFldStrict:
sym = instr->GetSrc1()->AsSymOpnd()->m_sym;
KillLiveFields(sym->AsPropertySym(), bv);
if (inGlobOpt)
{
AddToPropertiesWrittenTo(sym->AsPropertySym()->m_propertyId);
this->KillAllObjectTypes(bv);
}
break;
case Js::OpCode::InitSetFld:
case Js::OpCode::InitGetFld:
case Js::OpCode::InitClassMember:
case Js::OpCode::InitClassMemberGet:
case Js::OpCode::InitClassMemberSet:
sym = instr->GetDst()->AsSymOpnd()->m_sym;
KillLiveFields(sym->AsPropertySym(), bv);
if (inGlobOpt)
{
AddToPropertiesWrittenTo(sym->AsPropertySym()->m_propertyId);
this->KillAllObjectTypes(bv);
}
break;
case Js::OpCode::ConsoleScopedStFld:
case Js::OpCode::ConsoleScopedStFldStrict:
case Js::OpCode::ScopedStFld:
case Js::OpCode::ScopedStFldStrict:
// This is already taken care of for FastFld opcodes
if (inGlobOpt)
{
KillObjectHeaderInlinedTypeSyms(this->currentBlock, false);
if (this->objectTypeSyms)
{
if (this->currentBlock->globOptData.maybeWrittenTypeSyms == nullptr)
{
this->currentBlock->globOptData.maybeWrittenTypeSyms = JitAnew(this->alloc, BVSparse<JitArenaAllocator>, this->alloc);
}
this->currentBlock->globOptData.maybeWrittenTypeSyms->Or(this->objectTypeSyms);
}
}
// fall through
case Js::OpCode::InitFld:
case Js::OpCode::InitConstFld:
case Js::OpCode::InitLetFld:
case Js::OpCode::InitRootFld:
case Js::OpCode::InitRootConstFld:
case Js::OpCode::InitRootLetFld:
#if !FLOATVAR
case Js::OpCode::StSlotBoxTemp:
#endif
case Js::OpCode::StFld:
case Js::OpCode::StRootFld:
case Js::OpCode::StFldStrict:
case Js::OpCode::StRootFldStrict:
case Js::OpCode::StSlot:
case Js::OpCode::StSlotChkUndecl:
case Js::OpCode::StSuperFld:
case Js::OpCode::StSuperFldStrict:
Assert(dstOpnd != nullptr);
sym = dstOpnd->AsSymOpnd()->m_sym;
if (inGlobOpt)
{
AddToPropertiesWrittenTo(sym->AsPropertySym()->m_propertyId);
}
if ((inGlobOpt && (sym->AsPropertySym()->m_propertyId == Js::PropertyIds::valueOf || sym->AsPropertySym()->m_propertyId == Js::PropertyIds::toString)) ||
instr->CallsAccessor())
{
// If overriding valueof/tostring, we might have expected a previous LdFld to bailout on implicitCalls but didn't.
// CSE's for example would have expected a bailout. Clear all fields to prevent optimizing across.
this->KillAllFields(bv);
}
else
{
KillLiveFields(sym->AsPropertySym(), bv);
}
break;
case Js::OpCode::InlineArrayPush:
case Js::OpCode::InlineArrayPop:
if(instr->m_func->GetThisOrParentInlinerHasArguments())
{
this->KillAllFields(bv);
this->SetAnyPropertyMayBeWrittenTo();
}
else
{
KillLiveFields(this->lengthEquivBv, bv);
if (inGlobOpt)
{
// Deleting an item, or pushing a property to a non-array, may change object layout
KillAllObjectTypes(bv);
}
}
break;
case Js::OpCode::InlineeStart:
case Js::OpCode::InlineeEnd:
Assert(!instr->UsesAllFields());
// Kill all live 'arguments' and 'caller' fields, as 'inlineeFunction.arguments' and 'inlineeFunction.caller'
// cannot be copy-propped across different instances of the same inlined function.
KillLiveFields(argumentsEquivBv, bv);
KillLiveFields(callerEquivBv, bv);
break;
case Js::OpCode::CallDirect:
fnHelper = instr->GetSrc1()->AsHelperCallOpnd()->m_fnHelper;
switch (fnHelper)
{
case IR::JnHelperMethod::HelperArray_Shift:
case IR::JnHelperMethod::HelperArray_Splice:
case IR::JnHelperMethod::HelperArray_Unshift:
// Kill length field for built-ins that can update it.
if (nullptr != this->lengthEquivBv)
{
// If has arguments, all fields are killed in fall through
if (!instr->m_func->GetThisOrParentInlinerHasArguments())
{
KillLiveFields(this->lengthEquivBv, bv);
}
}
// fall through
case IR::JnHelperMethod::HelperArray_Reverse:
if (instr->m_func->GetThisOrParentInlinerHasArguments())
{
this->KillAllFields(bv);
this->SetAnyPropertyMayBeWrittenTo();
}
else if (inGlobOpt)
{
// Deleting an item may change object layout
KillAllObjectTypes(bv);
}
break;
case IR::JnHelperMethod::HelperArray_Slice:
case IR::JnHelperMethod::HelperArray_Concat:
if (inGlobOpt && this->objectTypeSyms)
{
if (this->currentBlock->globOptData.maybeWrittenTypeSyms == nullptr)
{
this->currentBlock->globOptData.maybeWrittenTypeSyms = JitAnew(this->alloc, BVSparse<JitArenaAllocator>, this->alloc);
}
this->currentBlock->globOptData.maybeWrittenTypeSyms->Or(this->objectTypeSyms);
}
break;
case IR::JnHelperMethod::HelperRegExp_Exec:
case IR::JnHelperMethod::HelperRegExp_ExecResultNotUsed:
case IR::JnHelperMethod::HelperRegExp_ExecResultUsed:
case IR::JnHelperMethod::HelperRegExp_ExecResultUsedAndMayBeTemp:
case IR::JnHelperMethod::HelperRegExp_MatchResultNotUsed:
case IR::JnHelperMethod::HelperRegExp_MatchResultUsed:
case IR::JnHelperMethod::HelperRegExp_MatchResultUsedAndMayBeTemp:
case IR::JnHelperMethod::HelperRegExp_ReplaceStringResultUsed:
case IR::JnHelperMethod::HelperRegExp_ReplaceStringResultNotUsed:
case IR::JnHelperMethod::HelperRegExp_SplitResultNotUsed:
case IR::JnHelperMethod::HelperRegExp_SplitResultUsed:
case IR::JnHelperMethod::HelperRegExp_SplitResultUsedAndMayBeTemp:
case IR::JnHelperMethod::HelperRegExp_SymbolSearch:
case IR::JnHelperMethod::HelperString_Match:
case IR::JnHelperMethod::HelperString_Search:
case IR::JnHelperMethod::HelperString_Split:
case IR::JnHelperMethod::HelperString_Replace:
// Consider: We may not need to kill all fields here.
// We need to kill all the built-in properties that can be written, though, and there are a lot of those.
this->KillAllFields(bv);
break;
}
break;
case Js::OpCode::LdHeapArguments:
case Js::OpCode::LdLetHeapArguments:
case Js::OpCode::LdHeapArgsCached:
case Js::OpCode::LdLetHeapArgsCached:
if (inGlobOpt) {
this->KillLiveFields(this->slotSyms, bv);
}
break;
case Js::OpCode::NewClassProto:
Assert(instr->GetSrc1());
if (IR::AddrOpnd::IsEqualAddr(instr->GetSrc1(), (void*)func->GetScriptContextInfo()->GetObjectPrototypeAddr()))
{
// No extends operand, the proto parent is the Object prototype
break;
}
// Fall through
case Js::OpCode::InitProto:
case Js::OpCode::NewScObjectNoCtor:
case Js::OpCode::NewScObjectNoCtorFull:
if (inGlobOpt)
{
// Opcodes that make an object into a prototype may break object-header-inlining and final type opt.
// Kill all known object layouts.
KillAllObjectTypes(bv);
}
break;
default:
if (instr->UsesAllFields())
{
// This also kills all property type values, as the same bit-vector tracks those stack syms.
this->KillAllFields(bv);
}
break;
}
}
void
GlobOpt::ProcessFieldKills(IR::Instr * instr)
{
if (!this->DoFieldCopyProp() && !this->DoFieldRefOpts() && !DoCSE())
{
Assert(this->currentBlock->globOptData.liveFields->IsEmpty());
return;
}
ProcessFieldKills(instr, this->currentBlock->globOptData.liveFields, true);
}
Value *
GlobOpt::CreateFieldSrcValue(PropertySym * sym, PropertySym * originalSym, IR::Opnd ** ppOpnd, IR::Instr * instr)
{
#if DBG
// If the opcode going to kill all field values immediate anyway, we shouldn't be giving it a value
Assert(!instr->UsesAllFields());
AssertCanCopyPropOrCSEFieldLoad(instr);
Assert(instr->GetSrc1() == *ppOpnd);
#endif
// Only give a value to fields if we are doing field copy prop.
// Consider: We should always copy prop local slots, but the only use right now is LdSlot from jit loop body.
// This should have one onus load, and thus no need for copy prop of field itself. We may want to support
// copy prop LdSlot if there are other uses of local slots
if (!this->DoFieldCopyProp())
{
return nullptr;
}
BOOL wasLive = this->currentBlock->globOptData.liveFields->TestAndSet(sym->m_id);
if (sym != originalSym)
{
this->currentBlock->globOptData.liveFields->TestAndSet(originalSym->m_id);
}
if (!wasLive)
{
// We don't clear the value when we kill the field.
// Clear it to make sure we don't use the old value.
this->currentBlock->globOptData.ClearSymValue(sym);
this->currentBlock->globOptData.ClearSymValue(originalSym);
}
Assert((*ppOpnd)->AsSymOpnd()->m_sym == sym || this->IsLoopPrePass());
// We don't use the sym store to do copy prop on hoisted fields, but create a value
// in case it can be copy prop out of the loop.
return this->NewGenericValue(ValueType::Uninitialized, *ppOpnd);
}
bool
GlobOpt::NeedBailOnImplicitCallWithFieldOpts(Loop *loop, bool hasLiveFields) const
{
if (!(((this->DoFieldRefOpts(loop) ||
this->DoFieldCopyProp(loop)) &&
hasLiveFields)))
{
return false;
}
return true;
}
IR::Instr *
GlobOpt::EnsureDisableImplicitCallRegion(Loop * loop)
{
Assert(loop->bailOutInfo != nullptr);
IR::Instr * endDisableImplicitCall = loop->endDisableImplicitCall;
if (endDisableImplicitCall)
{
return endDisableImplicitCall;
}
IR::Instr * bailOutTarget = EnsureBailTarget(loop);
Func * bailOutFunc = loop->GetFunc();
Assert(loop->bailOutInfo->bailOutFunc == bailOutFunc);
IR::MemRefOpnd * disableImplicitCallAddress = IR::MemRefOpnd::New(this->func->GetThreadContextInfo()->GetDisableImplicitFlagsAddr(), TyInt8, bailOutFunc);
IR::IntConstOpnd * disableImplicitCallAndExceptionValue = IR::IntConstOpnd::New(DisableImplicitCallAndExceptionFlag, TyInt8, bailOutFunc, true);
IR::IntConstOpnd * enableImplicitCallAndExceptionValue = IR::IntConstOpnd::New(DisableImplicitNoFlag, TyInt8, bailOutFunc, true);
IR::Opnd * implicitCallFlags = Lowerer::GetImplicitCallFlagsOpnd(bailOutFunc);
IR::IntConstOpnd * noImplicitCall = IR::IntConstOpnd::New(Js::ImplicitCall_None, TyInt8, bailOutFunc, true);
// Consider: if we are already doing implicit call in the outer loop, we don't need to clear the implicit call bit again
IR::Instr * clearImplicitCall = IR::Instr::New(Js::OpCode::Ld_A, implicitCallFlags, noImplicitCall, bailOutFunc);
bailOutTarget->InsertBefore(clearImplicitCall);
IR::Instr * disableImplicitCall = IR::Instr::New(Js::OpCode::Ld_A, disableImplicitCallAddress, disableImplicitCallAndExceptionValue, bailOutFunc);
bailOutTarget->InsertBefore(disableImplicitCall);
endDisableImplicitCall = IR::Instr::New(Js::OpCode::Ld_A, disableImplicitCallAddress, enableImplicitCallAndExceptionValue, bailOutFunc);
bailOutTarget->InsertBefore(endDisableImplicitCall);
IR::BailOutInstr * bailOutInstr = IR::BailOutInstr::New(Js::OpCode::BailOnNotEqual, IR::BailOutOnImplicitCalls, loop->bailOutInfo, loop->bailOutInfo->bailOutFunc);
bailOutInstr->SetSrc1(implicitCallFlags);
bailOutInstr->SetSrc2(noImplicitCall);
bailOutTarget->InsertBefore(bailOutInstr);
loop->endDisableImplicitCall = endDisableImplicitCall;
return endDisableImplicitCall;
}
#if DBG
bool
GlobOpt::IsPropertySymId(SymID symId) const
{
return this->func->m_symTable->Find(symId)->IsPropertySym();
}
void
GlobOpt::AssertCanCopyPropOrCSEFieldLoad(IR::Instr * instr)
{
// Consider: Hoisting LdRootFld may have complication with exception if the field doesn't exist.
// We need to have another opcode for the hoisted version to avoid the exception and bailout.
Assert(instr->m_opcode == Js::OpCode::LdSlot || instr->m_opcode == Js::OpCode::LdSlotArr
|| instr->m_opcode == Js::OpCode::LdFld || instr->m_opcode == Js::OpCode::LdFldForCallApplyTarget
|| instr->m_opcode == Js::OpCode::LdLen_A
|| instr->m_opcode == Js::OpCode::LdRootFld || instr->m_opcode == Js::OpCode::LdSuperFld
|| instr->m_opcode == Js::OpCode::LdFldForTypeOf || instr->m_opcode == Js::OpCode::LdRootFldForTypeOf
|| instr->m_opcode == Js::OpCode::LdMethodFld || instr->m_opcode == Js::OpCode::LdMethodFldPolyInlineMiss
|| instr->m_opcode == Js::OpCode::LdRootMethodFld
|| instr->m_opcode == Js::OpCode::LdMethodFromFlags
|| instr->m_opcode == Js::OpCode::ScopedLdMethodFld
|| instr->m_opcode == Js::OpCode::CheckFixedFld
|| instr->m_opcode == Js::OpCode::CheckPropertyGuardAndLoadType
|| instr->m_opcode == Js::OpCode::ScopedLdFld
|| instr->m_opcode == Js::OpCode::ScopedLdFldForTypeOf);
Assert(instr->m_opcode == Js::OpCode::CheckFixedFld || instr->GetDst()->GetType() == TyVar || instr->m_func->GetJITFunctionBody()->IsAsmJsMode());
Assert(instr->GetSrc1()->GetType() == TyVar || instr->m_func->GetJITFunctionBody()->IsAsmJsMode());
Assert(instr->GetSrc1()->AsSymOpnd()->m_sym->IsPropertySym());
Assert(instr->GetSrc2() == nullptr);
}
#endif
StackSym *
GlobOpt::EnsureObjectTypeSym(StackSym * objectSym)
{
Assert(!objectSym->IsTypeSpec());
objectSym->EnsureObjectInfo(this->func);
if (objectSym->HasObjectTypeSym())
{
Assert(this->objectTypeSyms);
return objectSym->GetObjectTypeSym();
}
if (this->objectTypeSyms == nullptr)
{
this->objectTypeSyms = JitAnew(this->alloc, BVSparse<JitArenaAllocator>, this->alloc);
}
StackSym * typeSym = StackSym::New(TyVar, this->func);
objectSym->GetObjectInfo()->m_typeSym = typeSym;
this->objectTypeSyms->Set(typeSym->m_id);
return typeSym;
}
PropertySym *
GlobOpt::EnsurePropertyWriteGuardSym(PropertySym * propertySym)
{
// Make sure that the PropertySym has a proto cache sym which is chained into the propertySym list.
if (!propertySym->m_writeGuardSym)
{
propertySym->m_writeGuardSym = PropertySym::New(propertySym->m_stackSym, propertySym->m_propertyId, (uint32)-1, (uint)-1, PropertyKindWriteGuard, this->func);
}
return propertySym->m_writeGuardSym;
}
void
GlobOpt::PreparePropertySymForTypeCheckSeq(PropertySym *propertySym)
{
Assert(!propertySym->m_stackSym->IsTypeSpec());
EnsureObjectTypeSym(propertySym->m_stackSym);
EnsurePropertyWriteGuardSym(propertySym);
}
bool
GlobOpt::IsPropertySymPreparedForTypeCheckSeq(PropertySym *propertySym)
{
Assert(!propertySym->m_stackSym->IsTypeSpec());
// The following doesn't need to be true. We may copy prop a constant into an object sym, which has
// previously been prepared for type check sequence optimization.
// Assert(!propertySym->m_stackSym->m_isIntConst || !propertySym->HasObjectTypeSym());
// The following doesn't need to be true. We may copy prop the object sym into a field load or store
// that doesn't have object type spec info and hence the operand wasn't prepared and doesn't have a write
// guard. The object sym, however, may have other field operations which are object type specialized and
// thus the type sym for it has been created.
// Assert(propertySym->HasObjectTypeSym() == propertySym->HasWriteGuardSym());
return propertySym->HasObjectTypeSym();
}
bool
GlobOpt::PreparePropertySymOpndForTypeCheckSeq(IR::PropertySymOpnd * propertySymOpnd, IR::Instr* instr, Loop * loop)
{
if (!DoFieldRefOpts(loop) || !OpCodeAttr::FastFldInstr(instr->m_opcode) || instr->CallsAccessor())
{
return false;
}
if (!propertySymOpnd->HasObjTypeSpecFldInfo())
{
return false;
}
ObjTypeSpecFldInfo* info = propertySymOpnd->GetObjTypeSpecInfo();
if (info->UsesAccessor() || info->IsRootObjectNonConfigurableFieldLoad())
{
return false;
}
if (info->IsPoly() && !info->GetEquivalentTypeSet())
{
return false;
}
PropertySym * propertySym = propertySymOpnd->m_sym->AsPropertySym();
PreparePropertySymForTypeCheckSeq(propertySym);
propertySymOpnd->SetTypeCheckSeqCandidate(true);
propertySymOpnd->SetIsBeingStored(propertySymOpnd == instr->GetDst());
return true;
}
bool
GlobOpt::CheckIfPropOpEmitsTypeCheck(IR::Instr *instr, IR::PropertySymOpnd *opnd)
{
if (!DoFieldRefOpts() || !OpCodeAttr::FastFldInstr(instr->m_opcode))
{
return false;
}
if (!opnd->IsTypeCheckSeqCandidate())
{
return false;
}
return CheckIfInstrInTypeCheckSeqEmitsTypeCheck(instr, opnd);
}
IR::PropertySymOpnd *
GlobOpt::CreateOpndForTypeCheckOnly(IR::PropertySymOpnd* opnd, Func* func)
{
// Used only for CheckObjType instruction today. Future users should make a call
// whether the new operand is jit optimized in their scenario or not.
Assert(!opnd->IsRootObjectNonConfigurableFieldLoad());
IR::PropertySymOpnd *newOpnd = opnd->CopyCommon(func);
newOpnd->SetObjTypeSpecFldInfo(opnd->GetObjTypeSpecInfo());
newOpnd->SetUsesAuxSlot(opnd->UsesAuxSlot());
newOpnd->SetSlotIndex(opnd->GetSlotIndex());
newOpnd->objTypeSpecFlags = opnd->objTypeSpecFlags;
// If we're turning the instruction owning this operand into a CheckObjType, we will do a type check here
// only for the sake of downstream instructions, so the flags pertaining to this property access are
// irrelevant, because we don't do a property access here.
newOpnd->SetTypeCheckOnly(true);
newOpnd->usesFixedValue = false;
newOpnd->finalType = opnd->finalType;
newOpnd->guardedPropOps = opnd->guardedPropOps != nullptr ? opnd->guardedPropOps->CopyNew() : nullptr;
newOpnd->writeGuards = opnd->writeGuards != nullptr ? opnd->writeGuards->CopyNew() : nullptr;
newOpnd->SetIsJITOptimizedReg(true);
return newOpnd;
}
bool
GlobOpt::FinishOptPropOp(IR::Instr *instr, IR::PropertySymOpnd *opnd, BasicBlock* block, bool updateExistingValue, bool* emitsTypeCheckOut, bool* changesTypeValueOut)
{
if (!DoFieldRefOpts() || !OpCodeAttr::FastFldInstr(instr->m_opcode))
{
return false;
}
bool isTypeCheckSeqCandidate = opnd->IsTypeCheckSeqCandidate();
bool isObjTypeSpecialized = false;
bool isObjTypeChecked = false;
if (isTypeCheckSeqCandidate)
{
isObjTypeSpecialized = ProcessPropOpInTypeCheckSeq<true>(instr, opnd, block, updateExistingValue, emitsTypeCheckOut, changesTypeValueOut, &isObjTypeChecked);
}
if (opnd == instr->GetDst() && this->objectTypeSyms)
{
if (block == nullptr)
{
block = this->currentBlock;
}
// This is a property store that may change the layout of the object that it stores to. This means that
// it may change any aliased object. Do two things to address this:
// - Add all object types in this function to the set that may have had a property added. This will prevent
// final type optimization across this instruction. (Only needed here for non-specialized stores.)
// - Kill all type symbols that currently hold object-header-inlined types. Any of them may have their layout
// changed by the addition of a property.
SymID opndId = opnd->HasObjectTypeSym() ? opnd->GetObjectTypeSym()->m_id : -1;
if (!isObjTypeSpecialized || opnd->IsBeingAdded())
{
if (block->globOptData.maybeWrittenTypeSyms == nullptr)
{
block->globOptData.maybeWrittenTypeSyms = JitAnew(this->alloc, BVSparse<JitArenaAllocator>, this->alloc);
}
if (isObjTypeSpecialized)
{
// The current object will be protected by a type check, unless no further accesses to it are
// protected by this access.
Assert(this->objectTypeSyms->Test(opndId));
this->objectTypeSyms->Clear(opndId);
}
block->globOptData.maybeWrittenTypeSyms->Or(this->objectTypeSyms);
if (isObjTypeSpecialized)
{
this->objectTypeSyms->Set(opndId);
}
}
if (!isObjTypeSpecialized || opnd->ChangesObjectLayout())
{
this->KillObjectHeaderInlinedTypeSyms(block, isObjTypeSpecialized, opndId);
this->KillAuxSlotPtrSyms(opnd, block, isObjTypeSpecialized);
}
else if (!isObjTypeChecked && this->HasLiveObjectHeaderInlinedTypeSym(block, true, opndId))
{
opnd->SetTypeCheckRequired(true);
}
}
return isObjTypeSpecialized;
}
StackSym *
GlobOpt::EnsureAuxSlotPtrSym(IR::PropertySymOpnd *opnd)
{
StackSym *auxSlotPtrSym = opnd->EnsureAuxSlotPtrSym(this->func);
this->auxSlotPtrSyms->Set(auxSlotPtrSym->m_id);
return auxSlotPtrSym;
}
void
GlobOpt::KillAuxSlotPtrSyms(IR::PropertySymOpnd *opnd, BasicBlock *block, bool isObjTypeSpecialized)
{
StackSym *auxSlotPtrSym = nullptr;
if (isObjTypeSpecialized)
{
// Kill all aux slot syms other than this one
auxSlotPtrSym = opnd->GetAuxSlotPtrSym();
if (auxSlotPtrSym)
{
Assert(this->auxSlotPtrSyms && this->auxSlotPtrSyms->Test(auxSlotPtrSym->m_id));
this->auxSlotPtrSyms->Clear(auxSlotPtrSym->m_id);
}
}
block->globOptData.liveFields->Minus(this->auxSlotPtrSyms);
if (auxSlotPtrSym)
{
this->auxSlotPtrSyms->Set(auxSlotPtrSym->m_id);
}
}
void
GlobOpt::KillObjectHeaderInlinedTypeSyms(BasicBlock *block, bool isObjTypeSpecialized, SymID opndId)
{
this->MapObjectHeaderInlinedTypeSymsUntil(block, isObjTypeSpecialized, opndId, [&](SymID symId)->bool { this->currentBlock->globOptData.liveFields->Clear(symId); return false; });
}
bool
GlobOpt::HasLiveObjectHeaderInlinedTypeSym(BasicBlock *block, bool isObjTypeSpecialized, SymID opndId)
{
return this->MapObjectHeaderInlinedTypeSymsUntil(block, true, opndId, [&](SymID symId)->bool { return this->currentBlock->globOptData.liveFields->Test(symId); });
}
template<class Fn>
bool
GlobOpt::MapObjectHeaderInlinedTypeSymsUntil(BasicBlock *block, bool isObjTypeSpecialized, SymID opndId, Fn fn)
{
if (this->objectTypeSyms == nullptr)
{
return false;