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IRBuilder.cpp
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//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Copyright (c) 2021 ChakraCore Project Contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
#include "Backend.h"
#include "Library/ForInObjectEnumerator.h"
#pragma prefast(push)
#pragma prefast(disable:28652, "Prefast complains that the OR are causing the compiler to emit dynamic initializers and the variable to be allocated in read/write mem...")
static const IR::BailOutKind c_debuggerBailOutKindForCall =
IR::BailOutForceByFlag | IR::BailOutStackFrameBase | IR::BailOutBreakPointInFunction | IR::BailOutLocalValueChanged | IR::BailOutIgnoreException | IR::BailOutStep;
static const IR::BailOutKind c_debuggerBaseBailOutKindForHelper = IR::BailOutIgnoreException | IR::BailOutForceByFlag;
#pragma prefast(pop)
uint
IRBuilder::AddStatementBoundary(uint statementIndex, uint offset)
{
// Under debugger we use full stmt map, so that we know exactly start and end of each user stmt.
// We insert additional instrs in between statements, such as ProfiledLoopStart, for these bytecode reader acts as
// there is "unknown" stmt boundary with statementIndex == -1. Don't add stmt boundary for that as later
// it may cause issues, e.g. see WinBlue 218307.
if (!(statementIndex == Js::Constants::NoStatementIndex && this->m_func->IsJitInDebugMode()))
{
IR::PragmaInstr* pragmaInstr = IR::PragmaInstr::New(Js::OpCode::StatementBoundary, statementIndex, m_func);
this->AddInstr(pragmaInstr, offset);
}
#ifdef BAILOUT_INJECTION
if (!this->m_func->IsOOPJIT())
{
// Don't inject bailout if the function have trys
if (!this->m_func->GetTopFunc()->HasTry() && (statementIndex != Js::Constants::NoStatementIndex))
{
if (Js::Configuration::Global.flags.IsEnabled(Js::BailOutFlag) && !this->m_func->GetJITFunctionBody()->IsLibraryCode())
{
ULONG line;
LONG col;
// Since we're on a separate thread, don't allow the line cache to be allocated in the Recycler.
if (((Js::FunctionBody*)m_func->GetJITFunctionBody()->GetAddr())->GetLineCharOffset(this->m_jnReader.GetCurrentOffset(), &line, &col, false /*canAllocateLineCache*/))
{
line++;
if (Js::Configuration::Global.flags.BailOut.Contains(line, (uint32)col) || Js::Configuration::Global.flags.BailOut.Contains(line, (uint32)-1))
{
this->InjectBailOut(offset);
}
}
}
else if (Js::Configuration::Global.flags.IsEnabled(Js::BailOutAtEveryLineFlag))
{
this->InjectBailOut(offset);
}
}
}
#endif
return m_statementReader.MoveNextStatementBoundary();
}
// Add conditional bailout for breaking into interpreter debug thunk - for fast F12.
void
IRBuilder::InsertBailOutForDebugger(uint byteCodeOffset, IR::BailOutKind kind, IR::Instr* insertBeforeInstr /* default nullptr */)
{
Assert(m_func->IsJitInDebugMode());
Assert(byteCodeOffset != Js::Constants::NoByteCodeOffset);
BailOutInfo * bailOutInfo = JitAnew(m_func->m_alloc, BailOutInfo, byteCodeOffset, m_func);
IR::BailOutInstr * instr = IR::BailOutInstr::New(Js::OpCode::BailForDebugger, kind, bailOutInfo, bailOutInfo->bailOutFunc);
if (insertBeforeInstr)
{
InsertInstr(instr, insertBeforeInstr);
}
else
{
this->AddInstr(instr, m_lastInstr->GetByteCodeOffset());
}
}
bool
IRBuilder::DoBailOnNoProfile()
{
if (PHASE_OFF(Js::BailOnNoProfilePhase, this->m_func->GetTopFunc()))
{
return false;
}
Func *const topFunc = m_func->GetTopFunc();
if(topFunc->GetWorkItem()->GetProfiledIterations() == 0)
{
// The top function has not been profiled yet. Some switch must have been used to force jitting. This is not a
// real-world case, but for the purpose of testing the JIT, it's beneficial to generate code in unprofiled paths.
return false;
}
if (m_func->HasProfileInfo() && m_func->GetReadOnlyProfileInfo()->IsNoProfileBailoutsDisabled())
{
return false;
}
if (!m_func->DoGlobOpt())
{
return false;
}
#ifdef ENABLE_DEBUG_CONFIG_OPTIONS
if (this->m_func->GetTopFunc() != this->m_func && Js::Configuration::Global.flags.IsEnabled(Js::ForceJITLoopBodyFlag))
{
// No profile data for loop bodies with -force...
return false;
}
#endif
if (!this->m_func->HasProfileInfo())
{
return false;
}
if (m_func->GetTopFunc()->GetJITFunctionBody()->IsCoroutine())
{
return false;
}
return true;
}
void
IRBuilder::InsertBailOnNoProfile(uint offset)
{
Assert(DoBailOnNoProfile());
if (this->callTreeHasSomeProfileInfo)
{
return;
}
IR::Instr *startCall = nullptr;
int count = 0;
FOREACH_SLIST_ENTRY(IR::Instr *, argInstr, this->m_argStack)
{
if (argInstr->m_opcode == Js::OpCode::StartCall)
{
startCall = argInstr;
count++;
if (count > 1)
{
return;
}
}
} NEXT_SLIST_ENTRY;
AnalysisAssert(startCall);
if (startCall->m_prev->m_opcode != Js::OpCode::BailOnNoProfile)
{
InsertBailOnNoProfile(startCall);
}
}
void IRBuilder::InsertBailOnNoProfile(IR::Instr *const insertBeforeInstr)
{
Assert(DoBailOnNoProfile());
IR::Instr *const bailOnNoProfileInstr = IR::Instr::New(Js::OpCode::BailOnNoProfile, m_func);
InsertInstr(bailOnNoProfileInstr, insertBeforeInstr);
}
#ifdef BAILOUT_INJECTION
void
IRBuilder::InjectBailOut(uint offset)
{
if(m_func->IsSimpleJit())
{
return; // bailout injection is only applicable to full JIT
}
IR::IntConstOpnd * opnd = IR::IntConstOpnd::New(0, TyInt32, m_func);
uint bailOutOffset = offset;
if (bailOutOffset == Js::Constants::NoByteCodeOffset)
{
bailOutOffset = m_lastInstr->GetByteCodeOffset();
}
BailOutInfo * bailOutInfo = JitAnew(m_func->m_alloc, BailOutInfo, bailOutOffset, m_func);
IR::BailOutInstr * instr = IR::BailOutInstr::New(Js::OpCode::BailOnEqual, IR::BailOutInjected, bailOutInfo, bailOutInfo->bailOutFunc);
instr->SetSrc1(opnd);
instr->SetSrc2(opnd);
this->AddInstr(instr, offset);
}
void
IRBuilder::CheckBailOutInjection(Js::OpCode opcode)
{
// Detect these sequence and disable Bailout injection between them:
// LdStackArgPtr
// LdArgCnt
// ApplyArgs
// This assumes that LdStackArgPtr, LdArgCnt and ApplyArgs can
// only be emitted in these sequence. This will need to be modified if it changes.
//
// Also insert a single bailout before the beginning of a switch case block for all the case labels.
switch(opcode)
{
case Js::OpCode::LdStackArgPtr:
Assert(!seenLdStackArgPtr);
Assert(!expectApplyArg);
seenLdStackArgPtr = true;
break;
case Js::OpCode::LdArgCnt:
Assert(seenLdStackArgPtr);
Assert(!expectApplyArg);
expectApplyArg = true;
break;
case Js::OpCode::ApplyArgs:
Assert(seenLdStackArgPtr);
Assert(expectApplyArg);
seenLdStackArgPtr = false;
expectApplyArg = false;
break;
case Js::OpCode::BeginSwitch:
case Js::OpCode::ProfiledBeginSwitch:
Assert(!seenProfiledBeginSwitch);
seenProfiledBeginSwitch = true;
break;
case Js::OpCode::EndSwitch:
Assert(seenProfiledBeginSwitch);
seenProfiledBeginSwitch = false;
break;
default:
Assert(!seenLdStackArgPtr);
Assert(!expectApplyArg);
break;
}
}
#endif
bool
IRBuilder::IsLoopBody() const
{
return m_func->IsLoopBody();
}
bool
IRBuilder::IsLoopBodyInTry() const
{
return m_func->IsLoopBodyInTry();
}
bool
IRBuilder::IsLoopBodyReturnIPInstr(IR::Instr * instr) const
{
IR::Opnd * dst = instr->GetDst();
return (dst && dst->IsRegOpnd() && dst->AsRegOpnd()->m_sym == m_loopBodyRetIPSym);
}
bool
IRBuilder::IsLoopBodyOuterOffset(uint offset) const
{
if (!IsLoopBody())
{
return false;
}
return (offset >= m_func->m_workItem->GetLoopHeader()->endOffset || offset < m_func->m_workItem->GetLoopHeader()->startOffset);
}
uint
IRBuilder::GetLoopBodyExitInstrOffset() const
{
// End of loop body, start of StSlot and Ret instruction at endOffset + 1
return m_func->m_workItem->GetLoopHeader()->endOffset + 1;
}
Js::RegSlot
IRBuilder::GetEnvReg() const
{
return m_func->GetJITFunctionBody()->GetEnvReg();
}
Js::RegSlot
IRBuilder::GetEnvRegForInnerFrameDisplay() const
{
Js::RegSlot envReg = m_func->GetJITFunctionBody()->GetLocalFrameDisplayReg();
if (envReg == Js::Constants::NoRegister)
{
envReg = this->GetEnvReg();
}
return envReg;
}
void
IRBuilder::AddEnvOpndForInnerFrameDisplay(IR::Instr *instr, uint offset)
{
Js::RegSlot envReg = this->GetEnvRegForInnerFrameDisplay();
if (envReg != Js::Constants::NoRegister)
{
IR::RegOpnd *src2Opnd;
if (envReg == m_func->GetJITFunctionBody()->GetLocalFrameDisplayReg() &&
m_func->DoStackFrameDisplay() &&
m_func->IsTopFunc())
{
src2Opnd = IR::RegOpnd::New(TyVar, m_func);
this->AddInstr(
IR::Instr::New(
Js::OpCode::LdSlot, src2Opnd,
this->BuildFieldOpnd(Js::OpCode::LdSlot, m_func->GetLocalFrameDisplaySym()->m_id, 0, (Js::PropertyIdIndexType)-1, PropertyKindSlots),
m_func),
offset);
}
else
{
src2Opnd = this->BuildSrcOpnd(envReg);
}
instr->SetSrc2(src2Opnd);
}
}
///----------------------------------------------------------------------------
///
/// IRBuilder::Build
///
/// IRBuilder main entry point. Read the bytecode for this function and
/// generate IR.
///
///----------------------------------------------------------------------------
void
IRBuilder::Build()
{
m_funcAlloc = m_func->m_alloc;
NoRecoverMemoryJitArenaAllocator localAlloc(_u("BE-IRBuilder"), m_funcAlloc->GetPageAllocator(), Js::Throw::OutOfMemory);
m_tempAlloc = &localAlloc;
uint32 offset;
uint32 statementIndex = m_statementReader.GetStatementIndex();
m_argStack = JitAnew(m_tempAlloc, SList<IR::Instr *>, m_tempAlloc);
this->branchRelocList = JitAnew(m_tempAlloc, SList<BranchReloc *>, m_tempAlloc);
Func * topFunc = this->m_func->GetTopFunc();
if (topFunc->HasTry() &&
((!topFunc->IsLoopBody() && !PHASE_OFF(Js::OptimizeTryCatchPhase, topFunc)) ||
(topFunc->HasFinally() && !topFunc->IsLoopBody() && !PHASE_OFF(Js::OptimizeTryFinallyPhase, topFunc)) ||
(topFunc->IsSimpleJit() && topFunc->GetJITFunctionBody()->DoJITLoopBody()) || // should be relaxed as more bailouts are added in Simple Jit
topFunc->IsLoopBodyInTryFinally())) // We need accurate flow when we are full jitting loop bodies which have try finally
{
this->handlerOffsetStack = JitAnew(m_tempAlloc, SList<handlerStackElementType>, m_tempAlloc);
}
this->firstTemp = m_func->GetJITFunctionBody()->GetFirstTmpReg();
Js::RegSlot tempCount = m_func->GetJITFunctionBody()->GetTempCount();
if (tempCount > 0)
{
this->tempMap = AnewArrayZ(m_tempAlloc, SymID, tempCount);
}
else
{
this->tempMap = nullptr;
}
m_func->m_headInstr = IR::EntryInstr::New(Js::OpCode::FunctionEntry, m_func);
m_func->m_exitInstr = IR::ExitInstr::New(Js::OpCode::FunctionExit, m_func);
m_func->m_tailInstr = m_func->m_exitInstr;
m_func->m_headInstr->InsertAfter(m_func->m_tailInstr);
if (m_func->GetJITFunctionBody()->IsParamAndBodyScopeMerged() || this->IsLoopBody())
{
this->SetParamScopeDone();
}
if (m_func->GetJITFunctionBody()->GetLocalClosureReg() != Js::Constants::NoRegister)
{
m_func->InitLocalClosureSyms();
}
m_functionStartOffset = m_jnReader.GetCurrentOffset();
m_lastInstr = m_func->m_headInstr;
AssertMsg(sizeof(SymID) >= sizeof(Js::RegSlot), "sizeof(SymID) != sizeof(Js::RegSlot)!!");
// Skip the last EndOfBlock opcode
Assert(!OpCodeAttr::HasMultiSizeLayout(Js::OpCode::EndOfBlock));
uint32 lastOffset = m_func->GetJITFunctionBody()->GetByteCodeLength() - Js::OpCodeUtil::EncodedSize(Js::OpCode::EndOfBlock, Js::SmallLayout);
uint32 offsetToInstructionCount = lastOffset;
if (this->IsLoopBody())
{
// LdSlot needs to cover all the register, including the temps, because we might treat
// those as if they are local for the value of the with statement
this->m_ldSlots = BVFixed::New<JitArenaAllocator>(m_func->GetJITFunctionBody()->GetLocalsCount(), m_tempAlloc);
this->m_stSlots = BVFixed::New<JitArenaAllocator>(m_func->GetJITFunctionBody()->GetFirstTmpReg(), m_tempAlloc);
this->m_loopBodyRetIPSym = StackSym::New(TyMachReg, this->m_func);
#if DBG
if (m_func->GetJITFunctionBody()->GetTempCount() != 0)
{
this->m_usedAsTemp = BVFixed::New<JitArenaAllocator>(m_func->GetJITFunctionBody()->GetTempCount(), m_tempAlloc);
}
#endif
lastOffset = m_func->m_workItem->GetLoopHeader()->endOffset;
AssertOrFailFast(lastOffset < m_func->GetJITFunctionBody()->GetByteCodeLength());
// Ret is created at lastOffset + 1, so we need lastOffset + 2 entries
offsetToInstructionCount = lastOffset + 2;
// Compute the offset of the start of the locals array as a Var index.
size_t localsOffset = Js::InterpreterStackFrame::GetOffsetOfLocals();
Assert(localsOffset % sizeof(Js::Var) == 0);
this->m_loopBodyLocalsStartSlot = (Js::PropertyId)(localsOffset / sizeof(Js::Var));
}
m_offsetToInstructionCount = offsetToInstructionCount;
m_offsetToInstruction = JitAnewArrayZ(m_tempAlloc, IR::Instr *, offsetToInstructionCount);
#ifdef BYTECODE_BRANCH_ISLAND
longBranchMap = JitAnew(m_tempAlloc, LongBranchMap, m_tempAlloc);
#endif
m_switchBuilder.Init(m_func, m_tempAlloc, false);
this->LoadNativeCodeData();
this->BuildConstantLoads();
if (!this->IsLoopBody() && m_func->GetJITFunctionBody()->HasImplicitArgIns())
{
this->BuildImplicitArgIns();
}
if (!this->IsLoopBody() && m_func->GetJITFunctionBody()->HasRestParameter())
{
this->BuildArgInRest();
}
// This is first bailout in the function, the locals at stack have not initialized to undefined, so do not restore them.
// Note that for generators, we insert the bailout after the jump table to allow
// the generator's execution to proceed before bailing out. Otherwise, we would always
// bail to the beginning of the function in the interpreter, creating an infinite loop.
if (m_func->IsJitInDebugMode() && !this->m_func->GetJITFunctionBody()->IsCoroutine())
{
this->InsertBailOutForDebugger(m_functionStartOffset, IR::BailOutForceByFlag | IR::BailOutBreakPointInFunction | IR::BailOutStep, nullptr);
}
#ifdef BAILOUT_INJECTION
// Start bailout inject after the constant and arg load. We don't bailout before that
IR::Instr * lastInstr = m_lastInstr;
#endif
offset = Js::Constants::NoByteCodeOffset;
if (!this->IsLoopBody())
{
IR::Instr *instr;
// Do the implicit operations LdEnv, NewScopeSlots, LdFrameDisplay, as indicated by function body attributes.
Js::RegSlot envReg = m_func->GetJITFunctionBody()->GetEnvReg();
if (envReg != Js::Constants::NoRegister && !this->RegIsConstant(envReg))
{
Js::OpCode newOpcode;
Js::RegSlot thisReg = m_func->GetJITFunctionBody()->GetThisRegForEventHandler();
IR::RegOpnd *srcOpnd = nullptr;
IR::RegOpnd *dstOpnd = nullptr;
if (thisReg != Js::Constants::NoRegister)
{
this->BuildArgIn0(offset, thisReg);
srcOpnd = BuildSrcOpnd(thisReg);
newOpcode = Js::OpCode::LdHandlerScope;
}
else
{
newOpcode = Js::OpCode::LdEnv;
}
dstOpnd = BuildDstOpnd(envReg);
instr = IR::Instr::New(newOpcode, dstOpnd, m_func);
if (srcOpnd)
{
instr->SetSrc1(srcOpnd);
}
if (dstOpnd->m_sym->m_isSingleDef)
{
dstOpnd->m_sym->m_isNotNumber = true;
}
this->AddInstr(instr, offset);
}
// The point at which we insert the generator resume jump table is important.
// We want to insert it right *after* the environment and constants have
// been loaded and *before* we create any other important objects
// (e.g: FrameDisplay, LocalClosure) which will be passed on to the interpreter
// frame when we bail out. Those values, if used when we resume, will be restored
// by the bail-in code, therefore we don't want to unnecessarily create those new
// objects every time we "resume" a generator
//
// Note: We need to make sure that all the values below are allocated on the heap.
// so that they don't go away once this jit'd frame is popped off.
#ifdef BAILOUT_INJECTION
lastInstr = this->m_generatorJumpTable.BuildJumpTable();
#else
this->m_generatorJumpTable.BuildJumpTable();
#endif
// When debugging generators, insert bail-out after the jump table so that we can
// get to the right point before going back to the interpreter.
// This bailout is equivalent to the one inserted above for non-generator functions.
// Additionally, we also need to insert bailouts on each resume point and right
// after the bail-in code since this bailout is only for the very first time
// we are in the generator.
if (m_func->IsJitInDebugMode() && this->m_func->GetJITFunctionBody()->IsCoroutine())
{
this->InsertBailOutForDebugger(m_functionStartOffset, IR::BailOutForceByFlag | IR::BailOutBreakPointInFunction | IR::BailOutStep, nullptr);
}
Js::RegSlot funcExprScopeReg = m_func->GetJITFunctionBody()->GetFuncExprScopeReg();
IR::RegOpnd *frameDisplayOpnd = nullptr;
if (funcExprScopeReg != Js::Constants::NoRegister)
{
IR::RegOpnd *funcExprScopeOpnd = BuildDstOpnd(funcExprScopeReg);
instr = IR::Instr::New(Js::OpCode::NewPseudoScope, funcExprScopeOpnd, m_func);
this->AddInstr(instr, offset);
}
Js::RegSlot closureReg = m_func->GetJITFunctionBody()->GetLocalClosureReg();
IR::RegOpnd *closureOpnd = nullptr;
if (closureReg != Js::Constants::NoRegister)
{
Assert(!this->RegIsConstant(closureReg));
if (m_func->DoStackScopeSlots())
{
closureOpnd = IR::RegOpnd::New(TyVar, m_func);
}
else
{
closureOpnd = this->BuildDstOpnd(closureReg);
}
if (m_func->GetJITFunctionBody()->HasScopeObject())
{
if (m_func->GetJITFunctionBody()->HasCachedScopePropIds())
{
this->BuildInitCachedScope(0, offset);
}
else
{
instr = IR::Instr::New(Js::OpCode::NewScopeObject, closureOpnd, m_func);
this->AddInstr(instr, offset);
}
}
else
{
Js::OpCode op =
m_func->DoStackScopeSlots() ? Js::OpCode::NewStackScopeSlots : Js::OpCode::NewScopeSlots;
uint size = m_func->GetJITFunctionBody()->IsParamAndBodyScopeMerged() ? m_func->GetJITFunctionBody()->GetScopeSlotArraySize() : m_func->GetJITFunctionBody()->GetParamScopeSlotArraySize();
IR::Opnd * srcOpnd = IR::IntConstOpnd::New(size + Js::ScopeSlots::FirstSlotIndex, TyUint32, m_func);
instr = IR::Instr::New(op, closureOpnd, srcOpnd, m_func);
this->AddInstr(instr, offset);
}
if (closureOpnd->m_sym->m_isSingleDef)
{
closureOpnd->m_sym->m_isNotNumber = true;
}
if (m_func->DoStackScopeSlots())
{
// Init the stack closure sym and use it to save the scope slot pointer.
this->AddInstr(
IR::Instr::New(
Js::OpCode::InitLocalClosure, this->BuildDstOpnd(m_func->GetLocalClosureSym()->m_id), m_func),
offset);
this->AddInstr(
IR::Instr::New(
Js::OpCode::StSlot,
this->BuildFieldOpnd(
Js::OpCode::StSlot, m_func->GetLocalClosureSym()->m_id, 0, (Js::PropertyIdIndexType)-1, PropertyKindSlots),
closureOpnd, m_func),
offset);
}
}
Js::RegSlot frameDisplayReg = m_func->GetJITFunctionBody()->GetLocalFrameDisplayReg();
if (frameDisplayReg != Js::Constants::NoRegister)
{
Assert(!this->RegIsConstant(frameDisplayReg));
Js::OpCode op = m_func->DoStackScopeSlots() ? Js::OpCode::NewStackFrameDisplay : Js::OpCode::LdFrameDisplay;
if (funcExprScopeReg != Js::Constants::NoRegister)
{
// Insert the function expression scope ahead of any enclosing scopes.
IR::RegOpnd * funcExprScopeOpnd = BuildSrcOpnd(funcExprScopeReg);
frameDisplayOpnd = closureReg != Js::Constants::NoRegister ? IR::RegOpnd::New(TyVar, m_func) : BuildDstOpnd(frameDisplayReg);
instr = IR::Instr::New(Js::OpCode::LdFrameDisplay, frameDisplayOpnd, funcExprScopeOpnd, m_func);
if (envReg != Js::Constants::NoRegister)
{
instr->SetSrc2(this->BuildSrcOpnd(envReg));
}
this->AddInstr(instr, (uint)-1);
}
if (closureReg != Js::Constants::NoRegister)
{
IR::RegOpnd *dstOpnd;
if (m_func->DoStackScopeSlots() && m_func->IsTopFunc())
{
dstOpnd = IR::RegOpnd::New(TyVar, m_func);
}
else
{
dstOpnd = this->BuildDstOpnd(frameDisplayReg);
}
instr = IR::Instr::New(op, dstOpnd, closureOpnd, m_func);
if (frameDisplayOpnd != nullptr)
{
// We're building on an intermediate LdFrameDisplay result.
instr->SetSrc2(frameDisplayOpnd);
}
else if (envReg != Js::Constants::NoRegister)
{
// We're building on the environment created by the enclosing function.
instr->SetSrc2(this->BuildSrcOpnd(envReg));
}
this->AddInstr(instr, offset);
if (dstOpnd->m_sym->m_isSingleDef)
{
dstOpnd->m_sym->m_isNotNumber = true;
}
if (m_func->DoStackFrameDisplay())
{
// Use the stack closure sym to save the frame display pointer.
this->AddInstr(
IR::Instr::New(
Js::OpCode::InitLocalClosure, this->BuildDstOpnd(m_func->GetLocalFrameDisplaySym()->m_id), m_func),
offset);
this->AddInstr(
IR::Instr::New(
Js::OpCode::StSlot,
this->BuildFieldOpnd(Js::OpCode::StSlot, m_func->GetLocalFrameDisplaySym()->m_id, 0, (Js::PropertyIdIndexType)-1, PropertyKindSlots),
dstOpnd, m_func),
offset);
}
}
}
}
offset = m_functionStartOffset;
if (m_statementReader.AtStatementBoundary(&m_jnReader))
{
statementIndex = this->AddStatementBoundary(statementIndex, offset);
}
// For label instr we can add bailout only after all labels were finalized. Put to list/add in the end.
JsUtil::BaseDictionary<IR::Instr*, int, JitArenaAllocator> ignoreExBranchInstrToOffsetMap(m_tempAlloc);
Js::LayoutSize layoutSize;
IR::Instr* lastProcessedInstrForJITLoopBody = m_func->m_headInstr;
for (Js::OpCode newOpcode = m_jnReader.ReadOp(layoutSize); (uint)m_jnReader.GetCurrentOffset() <= lastOffset; newOpcode = m_jnReader.ReadOp(layoutSize))
{
Assert(newOpcode != Js::OpCode::EndOfBlock);
#ifdef BAILOUT_INJECTION
if (!this->m_func->GetTopFunc()->HasTry()
#ifdef BYTECODE_BRANCH_ISLAND
&& newOpcode != Js::OpCode::BrLong // Don't inject bailout on BrLong as they are just redirecting to a different offset anyways
#endif
)
{
if (!this->m_func->IsOOPJIT())
{
if (!seenLdStackArgPtr && !seenProfiledBeginSwitch)
{
if (Js::Configuration::Global.flags.IsEnabled(Js::BailOutByteCodeFlag))
{
ThreadContext * threadContext = this->m_func->GetScriptContext()->GetThreadContext();
if (Js::Configuration::Global.flags.BailOutByteCode.Contains(threadContext->bailOutByteCodeLocationCount))
{
this->InjectBailOut(offset);
}
}
else if (Js::Configuration::Global.flags.IsEnabled(Js::BailOutAtEveryByteCodeFlag))
{
this->InjectBailOut(offset);
}
}
CheckBailOutInjection(newOpcode);
}
}
#endif
AssertOrFailFastMsg(Js::OpCodeUtil::IsValidByteCodeOpcode(newOpcode), "Error getting opcode from m_jnReader.Op()");
uint layoutAndSize = layoutSize * Js::OpLayoutType::Count + Js::OpCodeUtil::GetOpCodeLayout(newOpcode);
switch(layoutAndSize)
{
#define LAYOUT_TYPE(layout) \
case Js::OpLayoutType::layout: \
Assert(layoutSize == Js::SmallLayout); \
this->Build##layout(newOpcode, offset); \
break;
#define LAYOUT_TYPE_WMS(layout) \
case Js::SmallLayout * Js::OpLayoutType::Count + Js::OpLayoutType::layout: \
this->Build##layout<Js::SmallLayoutSizePolicy>(newOpcode, offset); \
break; \
case Js::MediumLayout * Js::OpLayoutType::Count + Js::OpLayoutType::layout: \
this->Build##layout<Js::MediumLayoutSizePolicy>(newOpcode, offset); \
break; \
case Js::LargeLayout * Js::OpLayoutType::Count + Js::OpLayoutType::layout: \
this->Build##layout<Js::LargeLayoutSizePolicy>(newOpcode, offset); \
break;
#include "ByteCode/LayoutTypes.h"
default:
AssertMsg(0, "Unimplemented layout");
break;
}
#ifdef BAILOUT_INJECTION
if (!this->m_func->IsOOPJIT())
{
if (!this->m_func->GetTopFunc()->HasTry() && Js::Configuration::Global.flags.IsEnabled(Js::BailOutByteCodeFlag))
{
ThreadContext * threadContext = this->m_func->GetScriptContext()->GetThreadContext();
if (lastInstr != m_lastInstr)
{
lastInstr = lastInstr->GetNextRealInstr();
if (lastInstr->HasBailOutInfo())
{
lastInstr = lastInstr->m_next;
}
lastInstr->bailOutByteCodeLocation = threadContext->bailOutByteCodeLocationCount;
lastInstr = m_lastInstr;
}
threadContext->bailOutByteCodeLocationCount++;
}
}
#endif
if (IsLoopBodyInTry() && lastProcessedInstrForJITLoopBody != m_lastInstr)
{
// traverse in backward so we get new/later value of given symId for storing instead of the earlier/stale
// symId value. m_stSlots is used to prevent multiple stores to the same symId.
FOREACH_INSTR_BACKWARD_EDITING_IN_RANGE(
instr,
instrPrev,
m_lastInstr,
lastProcessedInstrForJITLoopBody->m_next)
{
if (instr->GetDst() && instr->GetDst()->IsRegOpnd() && instr->GetDst()->GetStackSym()->HasByteCodeRegSlot())
{
StackSym * dstSym = instr->GetDst()->GetStackSym();
Js::RegSlot dstRegSlot = dstSym->GetByteCodeRegSlot();
if (!this->RegIsTemp(dstRegSlot) && !this->RegIsConstant(dstRegSlot))
{
SymID symId = dstSym->m_id;
AssertOrFailFast(symId < m_stSlots->Length());
if (this->m_stSlots->Test(symId))
{
// For jitted loop bodies that are in a try block, we consider any symbol that has a
// non-temp bytecode reg slot, to be write-through. Hence, generating StSlots at all
// defs for such symbols
IR::Instr * stSlot = this->GenerateLoopBodyStSlot(dstRegSlot);
AddInstr(stSlot, Js::Constants::NoByteCodeOffset);
this->m_stSlots->Clear(symId);
}
else
{
Assert(dstSym->m_isCatchObjectSym);
}
}
}
} NEXT_INSTR_BACKWARD_EDITING_IN_RANGE;
lastProcessedInstrForJITLoopBody = m_lastInstr;
}
offset = m_jnReader.GetCurrentOffset();
if (m_func->IsJitInDebugMode())
{
bool needBailoutForHelper = CONFIG_FLAG(EnableContinueAfterExceptionWrappersForHelpers) &&
(OpCodeAttr::NeedsPostOpDbgBailOut(newOpcode) ||
(m_lastInstr->m_opcode == Js::OpCode::CallHelper && m_lastInstr->GetSrc1() &&
HelperMethodAttributes::CanThrow(m_lastInstr->GetSrc1()->AsHelperCallOpnd()->m_fnHelper)));
if (needBailoutForHelper)
{
// Insert bailout after return from a helper call.
// For now use offset of next instr, when we get & ignore exception, we replace this with next statement offset.
if (m_lastInstr->IsBranchInstr())
{
// Debugger bailout on branches goes to different block which can become dead. Keep bailout with real instr.
// Can't convert to bailout at this time, can do that only after branches are finalized, remember for later.
ignoreExBranchInstrToOffsetMap.Add(m_lastInstr, offset);
}
else if (
m_lastInstr->m_opcode == Js::OpCode::Throw ||
m_lastInstr->m_opcode == Js::OpCode::RuntimeReferenceError ||
m_lastInstr->m_opcode == Js::OpCode::RuntimeTypeError)
{
uint32 lastInstrOffset = m_lastInstr->GetByteCodeOffset();
AssertOrFailFast(lastInstrOffset < m_offsetToInstructionCount);
#if DBG
__analysis_assume(lastInstrOffset < this->m_offsetToInstructionCount);
#endif
bool isLastInstrUpdateNeeded = m_offsetToInstruction[lastInstrOffset] == m_lastInstr;
BailOutInfo * bailOutInfo = JitAnew(this->m_func->m_alloc, BailOutInfo, offset, this->m_func);
m_lastInstr = m_lastInstr->ConvertToBailOutInstr(bailOutInfo, c_debuggerBaseBailOutKindForHelper, true);
if (isLastInstrUpdateNeeded)
{
m_offsetToInstruction[lastInstrOffset] = m_lastInstr;
}
}
else
{
IR::BailOutKind bailOutKind = c_debuggerBaseBailOutKindForHelper;
if (OpCodeAttr::HasImplicitCall(newOpcode) || OpCodeAttr::OpndHasImplicitCall(newOpcode))
{
// When we get out of e.g. valueOf called by a helper (e.g. Add_A) during stepping,
// we need to bail out to continue debugging calling function in interpreter,
// essentially this is similar to bail out on return from a method.
bailOutKind |= c_debuggerBailOutKindForCall;
}
this->InsertBailOutForDebugger(offset, bailOutKind);
}
}
}
while (m_statementReader.AtStatementBoundary(&m_jnReader))
{
statementIndex = this->AddStatementBoundary(statementIndex, offset);
}
}
if (Js::Constants::NoStatementIndex != statementIndex)
{
// If we are inside a user statement then create a trailing line pragma instruction
statementIndex = this->AddStatementBoundary(statementIndex, Js::Constants::NoByteCodeOffset);
}
if (IsLoopBody())
{
// Insert the LdSlot/StSlot and Ret
IR::Opnd * retOpnd = this->InsertLoopBodyReturnIPInstr(offset, offset);
// Restore and Ret are at the last offset + 1
GenerateLoopBodySlotAccesses(lastOffset + 1);
InsertDoneLoopBodyLoopCounter(lastOffset);
IR::Instr * retInstr = IR::Instr::New(Js::OpCode::Ret, m_func);
retInstr->SetSrc1(retOpnd);
this->AddInstr(retInstr, lastOffset + 1);
}
// Now fix up the targets for all the branches we've introduced.
InsertLabels();
Assert(!this->handlerOffsetStack || this->handlerOffsetStack->Empty());
// Insert bailout for ignore exception for labels, after all labels were finalized.
ignoreExBranchInstrToOffsetMap.Map([this](IR::Instr* instr, int byteCodeOffset) {
BailOutInfo * bailOutInfo = JitAnew(this->m_func->m_alloc, BailOutInfo, byteCodeOffset, this->m_func);
instr->ConvertToBailOutInstr(bailOutInfo, c_debuggerBaseBailOutKindForHelper, true);
});
// Now that we know whether the func is a leaf or not, decide whether we'll emit fast paths.
// Do this once and for all, per-func, since the source size on the ThreadContext will be
// changing while we JIT.
if (this->m_func->IsTopFunc())
{
this->m_func->SetDoFastPaths();
this->EmitClosureRangeChecks();
}
}
void
IRBuilder::EmitClosureRangeChecks()
{
if (m_func->frameDisplayCheckTable)
{
// Frame display checks. Again, chain to the instruction (LdEnv/LdSlot).
FOREACH_HASHTABLE_ENTRY(FrameDisplayCheckRecord*, bucket, m_func->frameDisplayCheckTable)
{
StackSym *stackSym = m_func->m_symTable->FindStackSym(bucket.value);
Assert(stackSym && stackSym->m_instrDef);
IR::Instr *instrDef = stackSym->m_instrDef;
IR::Instr *insertInstr = instrDef->m_next;
IR::RegOpnd *dstOpnd = instrDef->UnlinkDst()->AsRegOpnd();
IR::Instr *instr = IR::Instr::New(Js::OpCode::FrameDisplayCheck, dstOpnd, m_func);
dstOpnd = IR::RegOpnd::New(TyVar, m_func);
instrDef->SetDst(dstOpnd);
instr->SetSrc1(dstOpnd);
// Attach the two-dimensional check info.
IR::AddrOpnd *recordOpnd = IR::AddrOpnd::New(bucket.element, IR::AddrOpndKindDynamicMisc, m_func, true);
instr->SetSrc2(recordOpnd);
insertInstr->InsertBefore(instr);
}
NEXT_HASHTABLE_ENTRY;
}
// If not a loop, but there are loops and trys, restore scope slot pointer and FD
if (!m_func->IsLoopBody() && m_func->HasTry() && m_func->GetJITFunctionBody()->GetByteCodeInLoopCount() != 0)
{
BVSparse<JitArenaAllocator> * bv = nullptr;
if (m_func->GetLocalClosureSym() && m_func->GetLocalClosureSym()->HasByteCodeRegSlot())
{
bv = JitAnew(m_func->m_alloc, BVSparse<JitArenaAllocator>, m_func->m_alloc);
bv->Set(m_func->GetLocalClosureSym()->m_id);
}
if (m_func->GetLocalFrameDisplaySym() && m_func->GetLocalFrameDisplaySym()->HasByteCodeRegSlot())
{
if (!bv)
{
bv = JitAnew(m_func->m_alloc, BVSparse<JitArenaAllocator>, m_func->m_alloc);
}
bv->Set(m_func->GetLocalFrameDisplaySym()->m_id);
}
if (bv)
{
FOREACH_INSTR_IN_FUNC_BACKWARD(instr, m_func)
{
if (instr->m_opcode == Js::OpCode::Ret)
{
IR::ByteCodeUsesInstr * byteCodeUse = IR::ByteCodeUsesInstr::New(instr);
byteCodeUse->SetBV(bv);
instr->InsertBefore(byteCodeUse);
break;
}
}
NEXT_INSTR_IN_FUNC_BACKWARD;
}
}
}
///----------------------------------------------------------------------------
///
/// IRBuilder::InsertLabels
///
/// Insert label instructions at the offsets recorded in the branch reloc list.
///
///----------------------------------------------------------------------------
void
IRBuilder::InsertLabels()
{
AssertMsg(this->branchRelocList, "Malformed branch reloc list");
SList<BranchReloc *>::Iterator iter(this->branchRelocList);
while (iter.Next())
{
IR::LabelInstr * labelInstr = nullptr;
BranchReloc * reloc = iter.Data();
IR::BranchInstr * branchInstr = reloc->GetBranchInstr();
uint offset = reloc->GetOffset();
uint const branchOffset = reloc->GetBranchOffset();
Assert(!IsLoopBody() || offset <= GetLoopBodyExitInstrOffset());
if(branchInstr->m_opcode == Js::OpCode::MultiBr)
{
IR::MultiBranchInstr * multiBranchInstr = branchInstr->AsBranchInstr()->AsMultiBrInstr();
multiBranchInstr->UpdateMultiBrTargetOffsets([&](uint32 offset) -> IR::LabelInstr *
{
labelInstr = this->CreateLabel(branchInstr, offset);
multiBranchInstr->ChangeLabelRef(nullptr, labelInstr);
return labelInstr;
});
}
else
{
labelInstr = this->CreateLabel(branchInstr, offset);
branchInstr->SetTarget(labelInstr);
}
if (!reloc->IsNotBackEdge() && branchOffset >= offset)
{
bool wasLoopTop = labelInstr->m_isLoopTop;
labelInstr->m_isLoopTop = true;