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Func.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"
#include "Base/EtwTrace.h"
#include "Base/ScriptContextProfiler.h"
#ifdef VTUNE_PROFILING
#include "Base/VTuneChakraProfile.h"
#endif
#include "Library/ForInObjectEnumerator.h"
Func::Func(JitArenaAllocator *alloc, JITTimeWorkItem * workItem,
ThreadContextInfo * threadContextInfo,
ScriptContextInfo * scriptContextInfo,
JITOutputIDL * outputData,
Js::EntryPointInfo* epInfo,
const FunctionJITRuntimeInfo *const runtimeInfo,
JITTimePolymorphicInlineCacheInfo * const polymorphicInlineCacheInfo, void * const codeGenAllocators,
#if !FLOATVAR
CodeGenNumberAllocator * numberAllocator,
#endif
Js::ScriptContextProfiler *const codeGenProfiler, const bool isBackgroundJIT, Func * parentFunc,
uint postCallByteCodeOffset, Js::RegSlot returnValueRegSlot, const bool isInlinedConstructor,
Js::ProfileId callSiteIdInParentFunc, bool isGetterSetter) :
m_alloc(alloc),
m_workItem(workItem),
m_output(outputData),
m_entryPointInfo(epInfo),
m_threadContextInfo(threadContextInfo),
m_scriptContextInfo(scriptContextInfo),
m_runtimeInfo(runtimeInfo),
m_polymorphicInlineCacheInfo(polymorphicInlineCacheInfo),
m_codeGenAllocators(codeGenAllocators),
m_inlineeId(0),
pinnedTypeRefs(nullptr),
singleTypeGuards(nullptr),
equivalentTypeGuards(nullptr),
propertyGuardsByPropertyId(nullptr),
ctorCachesByPropertyId(nullptr),
callSiteToArgumentsOffsetFixupMap(nullptr),
indexedPropertyGuardCount(0),
propertiesWrittenTo(nullptr),
lazyBailoutProperties(alloc),
anyPropertyMayBeWrittenTo(false),
#ifdef PROFILE_EXEC
m_codeGenProfiler(codeGenProfiler),
#endif
m_isBackgroundJIT(isBackgroundJIT),
m_cloner(nullptr),
m_cloneMap(nullptr),
m_loopParamSym(nullptr),
m_funcObjSym(nullptr),
m_localClosureSym(nullptr),
m_paramClosureSym(nullptr),
m_localFrameDisplaySym(nullptr),
m_bailoutReturnValueSym(nullptr),
m_hasBailedOutSym(nullptr),
m_inlineeFrameStartSym(nullptr),
inlineeStart(nullptr),
m_regsUsed(0),
m_fg(nullptr),
m_labelCount(0),
m_argSlotsForFunctionsCalled(0),
m_hasCalls(false),
m_hasInlineArgsOpt(false),
m_canDoInlineArgsOpt(true),
unoptimizableArgumentsObjReference(0),
m_doFastPaths(false),
hasBailout(false),
firstIRTemp(0),
hasBailoutInEHRegion(false),
hasInstrNumber(false),
maintainByteCodeOffset(true),
frameSize(0),
topFunc(parentFunc ? parentFunc->topFunc : this),
parentFunc(parentFunc),
argObjSyms(nullptr),
m_nonTempLocalVars(nullptr),
hasAnyStackNestedFunc(false),
hasMarkTempObjects(false),
postCallByteCodeOffset(postCallByteCodeOffset),
maxInlineeArgOutSize(0),
returnValueRegSlot(returnValueRegSlot),
firstActualStackOffset(-1),
m_localVarSlotsOffset(Js::Constants::InvalidOffset),
m_hasLocalVarChangedOffset(Js::Constants::InvalidOffset),
actualCount((Js::ArgSlot) - 1),
tryCatchNestingLevel(0),
m_localStackHeight(0),
tempSymDouble(nullptr),
tempSymBool(nullptr),
hasInlinee(false),
thisOrParentInlinerHasArguments(false),
hasStackArgs(false),
hasArgLenAndConstOpt(false),
hasImplicitParamLoad(false),
hasThrow(false),
hasNonSimpleParams(false),
hasUnoptimizedArgumentsAccess(false),
applyTargetInliningRemovedArgumentsAccess(false),
hasImplicitCalls(false),
hasTempObjectProducingInstr(false),
isInlinedConstructor(isInlinedConstructor),
#if !FLOATVAR
numberAllocator(numberAllocator),
#endif
loopCount(0),
callSiteIdInParentFunc(callSiteIdInParentFunc),
isGetterSetter(isGetterSetter),
cachedInlineeFrameInfo(nullptr),
frameInfo(nullptr),
isTJLoopBody(false),
m_nativeCodeDataSym(nullptr),
isFlowGraphValid(false),
legalizePostRegAlloc(false),
#if DBG
m_callSiteCount(0),
#endif
stackNestedFunc(false),
stackClosure(false)
#if defined(_M_ARM32_OR_ARM64)
, m_ArgumentsOffset(0)
, m_epilogLabel(nullptr)
#endif
, m_funcStartLabel(nullptr)
, m_funcEndLabel(nullptr)
, bvStableSlotSyms(nullptr)
#if DBG
, hasCalledSetDoFastPaths(false)
, allowRemoveBailOutArgInstr(false)
, currentPhases(alloc)
, isPostLower(false)
, isPostRegAlloc(false)
, isPostPeeps(false)
, isPostLayout(false)
, isPostFinalLower(false)
, vtableMap(nullptr)
#endif
, m_yieldOffsetResumeLabelList(nullptr)
, m_bailOutNoSaveLabel(nullptr)
, constantAddressRegOpnd(alloc)
, lastConstantAddressRegLoadInstr(nullptr)
, m_totalJumpTableSizeInBytesForSwitchStatements(0)
, slotArrayCheckTable(nullptr)
, frameDisplayCheckTable(nullptr)
, stackArgWithFormalsTracker(nullptr)
, m_forInLoopBaseDepth(0)
, m_forInEnumeratorArrayOffset(-1)
, argInsCount(0)
, m_globalObjTypeSpecFldInfoArray(nullptr)
#if LOWER_SPLIT_INT64
, m_int64SymPairMap(nullptr)
#endif
#ifdef RECYCLER_WRITE_BARRIER_JIT
, m_lowerer(nullptr)
#endif
{
Assert(this->IsInlined() == !!runtimeInfo);
AssertOrFailFast(!HasProfileInfo() || GetReadOnlyProfileInfo()->GetLoopCount() == GetJITFunctionBody()->GetLoopCount());
Js::RegSlot tmpResult;
AssertOrFailFast(!UInt32Math::Add(GetJITFunctionBody()->GetConstCount(), GetJITFunctionBody()->GetVarCount(), &tmpResult));
AssertOrFailFast(GetJITFunctionBody()->IsAsmJsMode() || GetJITFunctionBody()->GetFirstTmpReg() <= GetJITFunctionBody()->GetLocalsCount());
AssertOrFailFast(!IsLoopBody() || m_workItem->GetLoopNumber() < GetJITFunctionBody()->GetLoopCount());
AssertOrFailFast(CONFIG_FLAG(Prejit) || CONFIG_ISENABLED(Js::ForceNativeFlag) || GetJITFunctionBody()->GetByteCodeLength() < (uint)CONFIG_FLAG(MaxJITFunctionBytecodeByteLength));
GetJITFunctionBody()->EnsureConsistentConstCount();
if (this->IsTopFunc())
{
outputData->hasJittedStackClosure = false;
outputData->localVarSlotsOffset = m_localVarSlotsOffset;
outputData->localVarChangedOffset = m_hasLocalVarChangedOffset;
this->bvStableSlotSyms = Anew(this->m_alloc, BVSparse<JitArenaAllocator>, this->m_alloc);
}
if (this->IsInlined())
{
m_inlineeId = ++(GetTopFunc()->m_inlineeId);
}
bool doStackNestedFunc = GetJITFunctionBody()->DoStackNestedFunc();
bool doStackClosure = GetJITFunctionBody()->DoStackClosure() && !PHASE_OFF(Js::FrameDisplayFastPathPhase, this) && !PHASE_OFF(Js::StackClosurePhase, this);
Assert(!doStackClosure || doStackNestedFunc);
this->stackClosure = doStackClosure && this->IsTopFunc();
if (this->stackClosure)
{
// TODO: calculate on runtime side?
m_output.SetHasJITStackClosure();
}
if (m_workItem->Type() == JsFunctionType &&
GetJITFunctionBody()->DoBackendArgumentsOptimization() &&
(!GetJITFunctionBody()->HasTry() || this->DoOptimizeTry()))
{
// doBackendArgumentsOptimization bit is set when there is no eval inside a function
// as determined by the bytecode generator.
SetHasStackArgs(true);
}
if (doStackNestedFunc && GetJITFunctionBody()->GetNestedCount() != 0 &&
(this->IsTopFunc() || this->GetTopFunc()->m_workItem->Type() != JsLoopBodyWorkItemType)) // make sure none of the functions inlined in a jitted loop body allocate nested functions on the stack
{
Assert(!(this->IsJitInDebugMode() && !GetJITFunctionBody()->IsLibraryCode()));
stackNestedFunc = true;
this->GetTopFunc()->hasAnyStackNestedFunc = true;
}
if (GetJITFunctionBody()->HasOrParentHasArguments() || (parentFunc && parentFunc->thisOrParentInlinerHasArguments))
{
thisOrParentInlinerHasArguments = true;
}
if (parentFunc == nullptr)
{
inlineDepth = 0;
m_symTable = JitAnew(alloc, SymTable);
m_symTable->Init(this);
m_symTable->SetStartingID(static_cast<SymID>(workItem->GetJITFunctionBody()->GetLocalsCount() + 1));
Assert(Js::Constants::NoByteCodeOffset == postCallByteCodeOffset);
Assert(Js::Constants::NoRegister == returnValueRegSlot);
#if defined(_M_IX86) || defined(_M_X64)
if (HasArgumentSlot())
{
// Pre-allocate the single argument slot we'll reserve for the arguments object.
// For ARM, the argument slot is not part of the local but part of the register saves
m_localStackHeight = MachArgsSlotOffset;
}
#endif
}
else
{
inlineDepth = parentFunc->inlineDepth + 1;
Assert(Js::Constants::NoByteCodeOffset != postCallByteCodeOffset);
}
this->constructorCacheCount = 0;
this->constructorCaches = AnewArrayZ(this->m_alloc, JITTimeConstructorCache*, GetJITFunctionBody()->GetProfiledCallSiteCount());
#if DBG_DUMP
m_codeSize = -1;
#endif
#if defined(_M_X64)
m_spillSize = -1;
m_argsSize = -1;
m_savedRegSize = -1;
#endif
if (this->IsJitInDebugMode())
{
m_nonTempLocalVars = Anew(this->m_alloc, BVSparse<JitArenaAllocator>, this->m_alloc);
}
if (GetJITFunctionBody()->IsCoroutine())
{
m_yieldOffsetResumeLabelList = YieldOffsetResumeLabelList::New(this->m_alloc);
}
if (this->IsTopFunc())
{
m_globalObjTypeSpecFldInfoArray = JitAnewArrayZ(this->m_alloc, ObjTypeSpecFldInfo*, GetWorkItem()->GetJITTimeInfo()->GetGlobalObjTypeSpecFldInfoCount());
}
for (uint i = 0; i < GetJITFunctionBody()->GetInlineCacheCount(); ++i)
{
ObjTypeSpecFldInfo * info = GetWorkItem()->GetJITTimeInfo()->GetObjTypeSpecFldInfo(i);
if (info != nullptr)
{
AssertOrFailFast(info->GetObjTypeSpecFldId() < GetTopFunc()->GetWorkItem()->GetJITTimeInfo()->GetGlobalObjTypeSpecFldInfoCount());
GetTopFunc()->m_globalObjTypeSpecFldInfoArray[info->GetObjTypeSpecFldId()] = info;
}
}
canHoistConstantAddressLoad = !PHASE_OFF(Js::HoistConstAddrPhase, this);
m_forInLoopMaxDepth = this->GetJITFunctionBody()->GetForInLoopDepth();
}
bool
Func::IsLoopBodyInTry() const
{
return IsLoopBody() && m_workItem->GetLoopHeader()->isInTry;
}
bool
Func::IsLoopBodyInTryFinally() const
{
return IsLoopBody() && m_workItem->GetLoopHeader()->isInTryFinally;
}
/* static */
void
Func::Codegen(JitArenaAllocator *alloc, JITTimeWorkItem * workItem,
ThreadContextInfo * threadContextInfo,
ScriptContextInfo * scriptContextInfo,
JITOutputIDL * outputData,
Js::EntryPointInfo* epInfo, // for in-proc jit only
const FunctionJITRuntimeInfo *const runtimeInfo,
JITTimePolymorphicInlineCacheInfo * const polymorphicInlineCacheInfo, void * const codeGenAllocators,
#if !FLOATVAR
CodeGenNumberAllocator * numberAllocator,
#endif
Js::ScriptContextProfiler *const codeGenProfiler, const bool isBackgroundJIT)
{
bool rejit;
int rejitCounter = 0;
do
{
Assert(rejitCounter < 25);
Func func(alloc, workItem, threadContextInfo,
scriptContextInfo, outputData, epInfo, runtimeInfo,
polymorphicInlineCacheInfo, codeGenAllocators,
#if !FLOATVAR
numberAllocator,
#endif
codeGenProfiler, isBackgroundJIT);
try
{
func.TryCodegen();
rejit = false;
}
catch (Js::RejitException ex)
{
// The work item needs to be rejitted, likely due to some optimization that was too aggressive
switch (ex.Reason())
{
case RejitReason::AggressiveIntTypeSpecDisabled:
outputData->disableAggressiveIntTypeSpec = TRUE;
break;
case RejitReason::InlineApplyDisabled:
workItem->GetJITFunctionBody()->DisableInlineApply();
outputData->disableInlineApply = TRUE;
break;
case RejitReason::InlineSpreadDisabled:
workItem->GetJITFunctionBody()->DisableInlineSpread();
outputData->disableInlineSpread = TRUE;
break;
case RejitReason::DisableStackArgOpt:
outputData->disableStackArgOpt = TRUE;
break;
case RejitReason::DisableStackArgLenAndConstOpt:
break;
case RejitReason::DisableSwitchOptExpectingInteger:
case RejitReason::DisableSwitchOptExpectingString:
outputData->disableSwitchOpt = TRUE;
break;
case RejitReason::ArrayCheckHoistDisabled:
case RejitReason::ArrayAccessHelperCallEliminationDisabled:
outputData->disableArrayCheckHoist = TRUE;
break;
case RejitReason::TrackIntOverflowDisabled:
outputData->disableTrackCompoundedIntOverflow = TRUE;
break;
default:
Assume(UNREACHED);
}
if (PHASE_TRACE(Js::ReJITPhase, &func))
{
char16 debugStringBuffer[MAX_FUNCTION_BODY_DEBUG_STRING_SIZE];
Output::Print(
_u("Rejit (compile-time): function: %s (%s) reason: %S\n"),
workItem->GetJITFunctionBody()->GetDisplayName(),
workItem->GetJITTimeInfo()->GetDebugNumberSet(debugStringBuffer),
ex.ReasonName());
}
rejit = true;
rejitCounter++;
}
// Either the entry point has a reference to the number now, or we failed to code gen and we
// don't need to numbers, we can flush the completed page now.
//
// If the number allocator is NULL then we are shutting down the thread context and so too the
// code generator. The number allocator must be freed before the recycler (and thus before the
// code generator) so we can't and don't need to flush it.
// TODO: OOP JIT, allocator cleanup
} while (rejit);
}
///----------------------------------------------------------------------------
///
/// Func::TryCodegen
///
/// Attempt to Codegen this function.
///
///----------------------------------------------------------------------------
void
Func::TryCodegen()
{
Assert(!IsJitInDebugMode() || !GetJITFunctionBody()->HasTry());
BEGIN_CODEGEN_PHASE(this, Js::BackEndPhase);
{
// IRBuilder
BEGIN_CODEGEN_PHASE(this, Js::IRBuilderPhase);
#ifdef ASMJS_PLAT
if (GetJITFunctionBody()->IsAsmJsMode())
{
IRBuilderAsmJs asmIrBuilder(this);
asmIrBuilder.Build();
}
else
#endif
{
IRBuilder irBuilder(this);
irBuilder.Build();
}
END_CODEGEN_PHASE(this, Js::IRBuilderPhase);
#ifdef IR_VIEWER
IRtoJSObjectBuilder::DumpIRtoGlobalObject(this, Js::IRBuilderPhase);
#endif /* IR_VIEWER */
BEGIN_CODEGEN_PHASE(this, Js::InlinePhase);
InliningHeuristics heuristics(GetWorkItem()->GetJITTimeInfo(), this->IsLoopBody());
Inline inliner(this, heuristics);
inliner.Optimize();
END_CODEGEN_PHASE(this, Js::InlinePhase);
ThrowIfScriptClosed();
// FlowGraph
{
// Scope for FlowGraph arena
NoRecoverMemoryJitArenaAllocator fgAlloc(_u("BE-FlowGraph"), m_alloc->GetPageAllocator(), Js::Throw::OutOfMemory);
BEGIN_CODEGEN_PHASE(this, Js::FGBuildPhase);
this->m_fg = FlowGraph::New(this, &fgAlloc);
this->m_fg->Build();
END_CODEGEN_PHASE(this, Js::FGBuildPhase);
// Global Optimization and Type Specialization
BEGIN_CODEGEN_PHASE(this, Js::GlobOptPhase);
GlobOpt globOpt(this);
globOpt.Optimize();
END_CODEGEN_PHASE(this, Js::GlobOptPhase);
// Delete flowGraph now
this->m_fg->Destroy();
this->m_fg = nullptr;
}
#ifdef IR_VIEWER
IRtoJSObjectBuilder::DumpIRtoGlobalObject(this, Js::GlobOptPhase);
#endif /* IR_VIEWER */
ThrowIfScriptClosed();
// Lowering
Lowerer lowerer(this);
BEGIN_CODEGEN_PHASE(this, Js::LowererPhase);
lowerer.Lower();
END_CODEGEN_PHASE(this, Js::LowererPhase);
#ifdef IR_VIEWER
IRtoJSObjectBuilder::DumpIRtoGlobalObject(this, Js::LowererPhase);
#endif /* IR_VIEWER */
// Encode constants
Security security(this);
BEGIN_CODEGEN_PHASE(this, Js::EncodeConstantsPhase)
security.EncodeLargeConstants();
END_CODEGEN_PHASE(this, Js::EncodeConstantsPhase);
if (GetJITFunctionBody()->DoInterruptProbe())
{
BEGIN_CODEGEN_PHASE(this, Js::InterruptProbePhase)
lowerer.DoInterruptProbes();
END_CODEGEN_PHASE(this, Js::InterruptProbePhase)
}
// Register Allocation
BEGIN_CODEGEN_PHASE(this, Js::RegAllocPhase);
LinearScan linearScan(this);
linearScan.RegAlloc();
END_CODEGEN_PHASE(this, Js::RegAllocPhase);
#ifdef IR_VIEWER
IRtoJSObjectBuilder::DumpIRtoGlobalObject(this, Js::RegAllocPhase);
#endif /* IR_VIEWER */
ThrowIfScriptClosed();
// Peephole optimizations
BEGIN_CODEGEN_PHASE(this, Js::PeepsPhase);
Peeps peeps(this);
peeps.PeepFunc();
END_CODEGEN_PHASE(this, Js::PeepsPhase);
// Layout
BEGIN_CODEGEN_PHASE(this, Js::LayoutPhase);
SimpleLayout layout(this);
layout.Layout();
END_CODEGEN_PHASE(this, Js::LayoutPhase);
if (this->HasTry() && this->hasBailoutInEHRegion)
{
BEGIN_CODEGEN_PHASE(this, Js::EHBailoutPatchUpPhase);
lowerer.EHBailoutPatchUp();
END_CODEGEN_PHASE(this, Js::EHBailoutPatchUpPhase);
}
// Insert NOPs (moving this before prolog/epilog for AMD64 and possibly ARM).
BEGIN_CODEGEN_PHASE(this, Js::InsertNOPsPhase);
security.InsertNOPs();
END_CODEGEN_PHASE(this, Js::InsertNOPsPhase);
// Prolog/Epilog
BEGIN_CODEGEN_PHASE(this, Js::PrologEpilogPhase);
if (GetJITFunctionBody()->IsAsmJsMode())
{
lowerer.LowerPrologEpilogAsmJs();
}
else
{
lowerer.LowerPrologEpilog();
}
END_CODEGEN_PHASE(this, Js::PrologEpilogPhase);
BEGIN_CODEGEN_PHASE(this, Js::FinalLowerPhase);
lowerer.FinalLower();
END_CODEGEN_PHASE(this, Js::FinalLowerPhase);
// Encoder
BEGIN_CODEGEN_PHASE(this, Js::EncoderPhase);
Encoder encoder(this);
encoder.Encode();
END_CODEGEN_PHASE_NO_DUMP(this, Js::EncoderPhase);
#ifdef IR_VIEWER
IRtoJSObjectBuilder::DumpIRtoGlobalObject(this, Js::EncoderPhase);
#endif /* IR_VIEWER */
}
#if DBG_DUMP
if (Js::Configuration::Global.flags.IsEnabled(Js::AsmDumpModeFlag))
{
FILE * oldFile = 0;
FILE * asmFile = GetScriptContext()->GetNativeCodeGenerator()->asmFile;
if (asmFile)
{
oldFile = Output::SetFile(asmFile);
}
this->Dump(IRDumpFlags_AsmDumpMode);
Output::Flush();
if (asmFile)
{
FILE *openedFile = Output::SetFile(oldFile);
Assert(openedFile == asmFile);
}
}
#endif
if (this->IsOOPJIT())
{
BEGIN_CODEGEN_PHASE(this, Js::NativeCodeDataPhase);
auto dataAllocator = this->GetNativeCodeDataAllocator();
if (dataAllocator->allocCount > 0)
{
NativeCodeData::DataChunk *chunk = (NativeCodeData::DataChunk*)dataAllocator->chunkList;
NativeCodeData::DataChunk *next1 = chunk;
while (next1)
{
if (next1->fixupFunc)
{
next1->fixupFunc(next1->data, chunk);
}
#if DBG
if (CONFIG_FLAG(OOPJITFixupValidate))
{
// Scan memory to see if there's missing pointer needs to be fixed up
// This can hit false positive if some data field happens to have value
// falls into the NativeCodeData memory range.
NativeCodeData::DataChunk *next2 = chunk;
while (next2)
{
for (unsigned int i = 0; i < next1->len / sizeof(void*); i++)
{
if (((void**)next1->data)[i] == (void*)next2->data)
{
NativeCodeData::VerifyExistFixupEntry((void*)next2->data, &((void**)next1->data)[i], next1->data);
}
}
next2 = next2->next;
}
}
#endif
next1 = next1->next;
}
JITOutputIDL* jitOutputData = m_output.GetOutputData();
size_t allocSize = offsetof(NativeDataFixupTable, fixupRecords) + sizeof(NativeDataFixupRecord)* (dataAllocator->allocCount);
jitOutputData->nativeDataFixupTable = (NativeDataFixupTable*)midl_user_allocate(allocSize);
if (!jitOutputData->nativeDataFixupTable)
{
Js::Throw::OutOfMemory();
}
__analysis_assume(jitOutputData->nativeDataFixupTable);
jitOutputData->nativeDataFixupTable->count = dataAllocator->allocCount;
jitOutputData->buffer = (NativeDataBuffer*)midl_user_allocate(offsetof(NativeDataBuffer, data) + dataAllocator->totalSize);
if (!jitOutputData->buffer)
{
Js::Throw::OutOfMemory();
}
__analysis_assume(jitOutputData->buffer);
jitOutputData->buffer->len = dataAllocator->totalSize;
unsigned int len = 0;
unsigned int count = 0;
next1 = chunk;
while (next1)
{
memcpy(jitOutputData->buffer->data + len, next1->data, next1->len);
len += next1->len;
jitOutputData->nativeDataFixupTable->fixupRecords[count].index = next1->allocIndex;
jitOutputData->nativeDataFixupTable->fixupRecords[count].length = next1->len;
jitOutputData->nativeDataFixupTable->fixupRecords[count].startOffset = next1->offset;
jitOutputData->nativeDataFixupTable->fixupRecords[count].updateList = next1->fixupList;
count++;
next1 = next1->next;
}
#if DBG
if (PHASE_TRACE1(Js::NativeCodeDataPhase))
{
Output::Print(_u("NativeCodeData Server Buffer: %p, len: %x, chunk head: %p\n"), jitOutputData->buffer->data, jitOutputData->buffer->len, chunk);
}
#endif
}
END_CODEGEN_PHASE(this, Js::NativeCodeDataPhase);
}
END_CODEGEN_PHASE(this, Js::BackEndPhase);
}
///----------------------------------------------------------------------------
/// Func::StackAllocate
/// Allocate stack space of given size.
///----------------------------------------------------------------------------
int32
Func::StackAllocate(int size)
{
Assert(this->IsTopFunc());
int32 offset;
#ifdef MD_GROW_LOCALS_AREA_UP
// Locals have positive offsets and are allocated from bottom to top.
m_localStackHeight = Math::Align(m_localStackHeight, min(size, MachStackAlignment));
offset = m_localStackHeight;
m_localStackHeight += size;
#else
// Locals have negative offsets and are allocated from top to bottom.
m_localStackHeight += size;
m_localStackHeight = Math::Align(m_localStackHeight, min(size, MachStackAlignment));
offset = -m_localStackHeight;
#endif
return offset;
}
///----------------------------------------------------------------------------
///
/// Func::StackAllocate
///
/// Allocate stack space for this symbol.
///
///----------------------------------------------------------------------------
int32
Func::StackAllocate(StackSym *stackSym, int size)
{
Assert(size > 0);
if (stackSym->IsArgSlotSym() || stackSym->IsParamSlotSym() || stackSym->IsAllocated())
{
return stackSym->m_offset;
}
Assert(stackSym->m_offset == 0);
stackSym->m_allocated = true;
stackSym->m_offset = StackAllocate(size);
return stackSym->m_offset;
}
void
Func::SetArgOffset(StackSym *stackSym, int32 offset)
{
AssertMsg(offset >= 0, "Why is the offset, negative?");
stackSym->m_offset = offset;
stackSym->m_allocated = true;
}
///
/// Ensures that local var slots are created, if the function has locals.
/// Allocate stack space for locals used for debugging
/// (for local non-temp vars we write-through memory so that locals inspection can make use of that.).
// On stack, after local slots we allocate space for metadata (in particular, whether any the locals was changed in debugger).
///
void
Func::EnsureLocalVarSlots()
{
Assert(IsJitInDebugMode());
if (!this->HasLocalVarSlotCreated())
{
uint32 localSlotCount = GetJITFunctionBody()->GetNonTempLocalVarCount();
if (localSlotCount && m_localVarSlotsOffset == Js::Constants::InvalidOffset)
{
// Allocate the slots.
int32 size = localSlotCount * GetDiagLocalSlotSize();
m_localVarSlotsOffset = StackAllocate(size);
m_hasLocalVarChangedOffset = StackAllocate(max(1, MachStackAlignment)); // Can't alloc less than StackAlignment bytes.
Assert(m_workItem->Type() == JsFunctionType);
m_output.SetVarSlotsOffset(AdjustOffsetValue(m_localVarSlotsOffset));
m_output.SetVarChangedOffset(AdjustOffsetValue(m_hasLocalVarChangedOffset));
}
}
}
void Func::SetFirstArgOffset(IR::Instr* inlineeStart)
{
Assert(inlineeStart->m_func == this);
Assert(!IsTopFunc());
int32 lastOffset;
IR::Instr* arg = inlineeStart->GetNextArg();
if (arg)
{
const auto lastArgOutStackSym = arg->GetDst()->AsSymOpnd()->m_sym->AsStackSym();
lastOffset = lastArgOutStackSym->m_offset;
Assert(lastArgOutStackSym->m_isSingleDef);
const auto secondLastArgOutOpnd = lastArgOutStackSym->m_instrDef->GetSrc2();
if (secondLastArgOutOpnd->IsSymOpnd())
{
const auto secondLastOffset = secondLastArgOutOpnd->AsSymOpnd()->m_sym->AsStackSym()->m_offset;
if (secondLastOffset > lastOffset)
{
lastOffset = secondLastOffset;
}
}
lastOffset += MachPtr;
}
else
{
Assert(this->GetTopFunc()->GetJITFunctionBody()->IsAsmJsMode());
lastOffset = MachPtr;
}
int32 firstActualStackOffset = lastOffset - ((this->actualCount + Js::Constants::InlineeMetaArgCount) * MachPtr);
Assert((this->firstActualStackOffset == -1) || (this->firstActualStackOffset == firstActualStackOffset));
this->firstActualStackOffset = firstActualStackOffset;
}
int32
Func::GetLocalVarSlotOffset(int32 slotId)
{
this->EnsureLocalVarSlots();
Assert(m_localVarSlotsOffset != Js::Constants::InvalidOffset);
int32 slotOffset = slotId * GetDiagLocalSlotSize();
return m_localVarSlotsOffset + slotOffset;
}
void Func::OnAddSym(Sym* sym)
{
Assert(sym);
if (this->IsJitInDebugMode() && this->IsNonTempLocalVar(sym->m_id))
{
Assert(m_nonTempLocalVars);
m_nonTempLocalVars->Set(sym->m_id);
}
}
void Func::AddStableSlotSym(PropertySym *sym)
{
this->GetTopFunc()->bvStableSlotSyms->Set(sym->m_id);
}
bool Func::IsStableSlotSym(PropertySym *sym) const
{
return this->GetTopFunc()->bvStableSlotSyms->Test(sym->m_id);
}
BVSparse<JitArenaAllocator> *Func::GetStableSlotSyms() const
{
return this->GetTopFunc()->bvStableSlotSyms;
}
///
/// Returns offset of the flag (1 byte) whether any local was changed (in debugger).
/// If the function does not have any locals, returns -1.
///
int32
Func::GetHasLocalVarChangedOffset()
{
this->EnsureLocalVarSlots();
return m_hasLocalVarChangedOffset;
}
bool
Func::IsJitInDebugMode() const
{
return m_workItem->IsJitInDebugMode();
}
bool
Func::IsNonTempLocalVar(uint32 slotIndex)
{
return GetJITFunctionBody()->IsNonTempLocalVar(slotIndex);
}
int32
Func::AdjustOffsetValue(int32 offset)
{
#ifdef MD_GROW_LOCALS_AREA_UP
return -(offset + BailOutInfo::StackSymBias);
#else
// Stack offset are negative, includes the PUSH EBP and return address
return offset - (2 * MachPtr);
#endif
}
#ifdef MD_GROW_LOCALS_AREA_UP
// Note: this is called during jit-compile when we finalize bail out record.
void
Func::AjustLocalVarSlotOffset()
{
if (GetJITFunctionBody()->GetNonTempLocalVarCount())
{
// Turn positive SP-relative base locals offset into negative frame-pointer-relative offset
// This is changing value for restoring the locals when read due to locals inspection.
int localsOffset = m_localVarSlotsOffset - (m_localStackHeight + m_ArgumentsOffset);
int valueChangeOffset = m_hasLocalVarChangedOffset - (m_localStackHeight + m_ArgumentsOffset);
m_output.SetVarSlotsOffset(localsOffset);
m_output.SetVarChangedOffset(valueChangeOffset);
}
}
#endif
bool
Func::DoGlobOptsForGeneratorFunc() const
{
// Disable GlobOpt optimizations for generators initially. Will visit and enable each one by one.
return !GetJITFunctionBody()->IsCoroutine();
}
bool
Func::DoSimpleJitDynamicProfile() const
{
return IsSimpleJit() && !PHASE_OFF(Js::SimpleJitDynamicProfilePhase, GetTopFunc()) && !CONFIG_FLAG(NewSimpleJit);
}
void
Func::SetDoFastPaths()
{
// Make sure we only call this once!
Assert(!this->hasCalledSetDoFastPaths);
bool doFastPaths = false;
if(!PHASE_OFF(Js::FastPathPhase, this) && (!IsSimpleJit() || CONFIG_FLAG(NewSimpleJit)))
{
doFastPaths = true;
}
this->m_doFastPaths = doFastPaths;
#ifdef DBG
this->hasCalledSetDoFastPaths = true;
#endif
}
#if LOWER_SPLIT_INT64
Int64RegPair Func::FindOrCreateInt64Pair(IR::Opnd* opnd)
{
if (!this->IsTopFunc())
{
return GetTopFunc()->FindOrCreateInt64Pair(opnd);
}
AssertMsg(currentPhases.Top() == Js::LowererPhase, "New Int64 sym map is only allowed during lower");
Int64RegPair pair;
IRType pairType = opnd->GetType();
if (opnd->IsInt64())
{
pairType = IRType_IsSignedInt(pairType) ? TyInt32 : TyUint32;
}
if (opnd->IsIndirOpnd())
{
IR::IndirOpnd* indir = opnd->AsIndirOpnd();
indir->SetType(pairType);
pair.low = indir;
pair.high = indir->Copy(this)->AsIndirOpnd();
pair.high->AsIndirOpnd()->SetOffset(indir->GetOffset() + 4);
return pair;
}
// Only indir opnd can have a type other than int64
Assert(opnd->IsInt64());
if (opnd->IsImmediateOpnd())
{
int64 value = opnd->GetImmediateValue(this);
pair.low = IR::IntConstOpnd::New((int32)value, pairType, this);
pair.high = IR::IntConstOpnd::New((int32)(value >> 32), pairType, this);
return pair;
}
Int64SymPair symPair;
if (!m_int64SymPairMap)
{
m_int64SymPairMap = Anew(m_alloc, Int64SymPairMap, m_alloc);
}
StackSym* stackSym = opnd->GetStackSym();
AssertOrFailFastMsg(stackSym, "Invalid int64 operand type");
SymID symId = stackSym->m_id;
if (!m_int64SymPairMap->TryGetValue(symId, &symPair))
{
if (stackSym->IsArgSlotSym() || stackSym->IsParamSlotSym())
{
const bool isArg = stackSym->IsArgSlotSym();
if (isArg)
{
Js::ArgSlot slotNumber = stackSym->GetArgSlotNum();
symPair.low = StackSym::NewArgSlotSym(slotNumber, this, pairType);
symPair.high = StackSym::NewArgSlotSym(slotNumber, this, pairType);
}
else
{
Js::ArgSlot slotNumber = stackSym->GetParamSlotNum();
symPair.low = StackSym::NewParamSlotSym(slotNumber, this, pairType);
symPair.high = StackSym::NewParamSlotSym(slotNumber + 1, this, pairType);
}
symPair.low->m_allocated = true;
symPair.low->m_offset = stackSym->m_offset;
symPair.high->m_allocated = true;
symPair.high->m_offset = stackSym->m_offset + 4;
}
else
{
symPair.low = StackSym::New(pairType, this);
symPair.high = StackSym::New(pairType, this);
}
m_int64SymPairMap->Add(symId, symPair);
}
if (opnd->IsSymOpnd())
{
pair.low = IR::SymOpnd::New(symPair.low, opnd->AsSymOpnd()->m_offset, pairType, this);
pair.high = IR::SymOpnd::New(symPair.high, opnd->AsSymOpnd()->m_offset, pairType, this);
}
else
{
pair.low = IR::RegOpnd::New(symPair.low, pairType, this);
pair.high = IR::RegOpnd::New(symPair.high, pairType, this);
}
return pair;
}