InlineFunction.cpp [plain text]
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/CaptureTracking.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Support/CommandLine.h"
#include <algorithm>
using namespace llvm;
static cl::opt<bool>
EnableNoAliasConversion("enable-noalias-to-md-conversion", cl::init(true),
cl::Hidden,
cl::desc("Convert noalias attributes to metadata during inlining."));
static cl::opt<bool>
PreserveAlignmentAssumptions("preserve-alignment-assumptions-during-inlining",
cl::init(true), cl::Hidden,
cl::desc("Convert align attributes to assumptions during inlining."));
bool llvm::InlineFunction(CallInst *CI, InlineFunctionInfo &IFI,
bool InsertLifetime) {
return InlineFunction(CallSite(CI), IFI, InsertLifetime);
}
bool llvm::InlineFunction(InvokeInst *II, InlineFunctionInfo &IFI,
bool InsertLifetime) {
return InlineFunction(CallSite(II), IFI, InsertLifetime);
}
namespace {
class InvokeInliningInfo {
BasicBlock *OuterResumeDest; BasicBlock *InnerResumeDest; LandingPadInst *CallerLPad; PHINode *InnerEHValuesPHI; SmallVector<Value*, 8> UnwindDestPHIValues;
public:
InvokeInliningInfo(InvokeInst *II)
: OuterResumeDest(II->getUnwindDest()), InnerResumeDest(nullptr),
CallerLPad(nullptr), InnerEHValuesPHI(nullptr) {
llvm::BasicBlock *InvokeBB = II->getParent();
BasicBlock::iterator I = OuterResumeDest->begin();
for (; isa<PHINode>(I); ++I) {
PHINode *PHI = cast<PHINode>(I);
UnwindDestPHIValues.push_back(PHI->getIncomingValueForBlock(InvokeBB));
}
CallerLPad = cast<LandingPadInst>(I);
}
BasicBlock *getOuterResumeDest() const {
return OuterResumeDest;
}
BasicBlock *getInnerResumeDest();
LandingPadInst *getLandingPadInst() const { return CallerLPad; }
void forwardResume(ResumeInst *RI,
SmallPtrSetImpl<LandingPadInst*> &InlinedLPads);
void addIncomingPHIValuesFor(BasicBlock *BB) const {
addIncomingPHIValuesForInto(BB, OuterResumeDest);
}
void addIncomingPHIValuesForInto(BasicBlock *src, BasicBlock *dest) const {
BasicBlock::iterator I = dest->begin();
for (unsigned i = 0, e = UnwindDestPHIValues.size(); i != e; ++i, ++I) {
PHINode *phi = cast<PHINode>(I);
phi->addIncoming(UnwindDestPHIValues[i], src);
}
}
};
}
BasicBlock *InvokeInliningInfo::getInnerResumeDest() {
if (InnerResumeDest) return InnerResumeDest;
BasicBlock::iterator SplitPoint = CallerLPad; ++SplitPoint;
InnerResumeDest =
OuterResumeDest->splitBasicBlock(SplitPoint,
OuterResumeDest->getName() + ".body");
const unsigned PHICapacity = 2;
BasicBlock::iterator InsertPoint = InnerResumeDest->begin();
BasicBlock::iterator I = OuterResumeDest->begin();
for (unsigned i = 0, e = UnwindDestPHIValues.size(); i != e; ++i, ++I) {
PHINode *OuterPHI = cast<PHINode>(I);
PHINode *InnerPHI = PHINode::Create(OuterPHI->getType(), PHICapacity,
OuterPHI->getName() + ".lpad-body",
InsertPoint);
OuterPHI->replaceAllUsesWith(InnerPHI);
InnerPHI->addIncoming(OuterPHI, OuterResumeDest);
}
InnerEHValuesPHI = PHINode::Create(CallerLPad->getType(), PHICapacity,
"eh.lpad-body", InsertPoint);
CallerLPad->replaceAllUsesWith(InnerEHValuesPHI);
InnerEHValuesPHI->addIncoming(CallerLPad, OuterResumeDest);
return InnerResumeDest;
}
void InvokeInliningInfo::forwardResume(ResumeInst *RI,
SmallPtrSetImpl<LandingPadInst*> &InlinedLPads) {
BasicBlock *Dest = getInnerResumeDest();
BasicBlock *Src = RI->getParent();
BranchInst::Create(Dest, Src);
addIncomingPHIValuesForInto(Src, Dest);
InnerEHValuesPHI->addIncoming(RI->getOperand(0), Src);
RI->eraseFromParent();
}
static void HandleCallsInBlockInlinedThroughInvoke(BasicBlock *BB,
InvokeInliningInfo &Invoke) {
for (BasicBlock::iterator BBI = BB->begin(), E = BB->end(); BBI != E; ) {
Instruction *I = BBI++;
CallInst *CI = dyn_cast<CallInst>(I);
if (!CI || CI->doesNotThrow() || isa<InlineAsm>(CI->getCalledValue()))
continue;
BasicBlock *Split = BB->splitBasicBlock(CI, CI->getName()+".noexc");
BB->getInstList().pop_back();
ImmutableCallSite CS(CI);
SmallVector<Value*, 8> InvokeArgs(CS.arg_begin(), CS.arg_end());
InvokeInst *II = InvokeInst::Create(CI->getCalledValue(), Split,
Invoke.getOuterResumeDest(),
InvokeArgs, CI->getName(), BB);
II->setDebugLoc(CI->getDebugLoc());
II->setCallingConv(CI->getCallingConv());
II->setAttributes(CI->getAttributes());
CI->replaceAllUsesWith(II);
Split->getInstList().pop_front();
Invoke.addIncomingPHIValuesFor(BB);
return;
}
}
static void HandleInlinedInvoke(InvokeInst *II, BasicBlock *FirstNewBlock,
ClonedCodeInfo &InlinedCodeInfo) {
BasicBlock *InvokeDest = II->getUnwindDest();
Function *Caller = FirstNewBlock->getParent();
InvokeInliningInfo Invoke(II);
SmallPtrSet<LandingPadInst*, 16> InlinedLPads;
for (Function::iterator I = FirstNewBlock, E = Caller->end(); I != E; ++I)
if (InvokeInst *II = dyn_cast<InvokeInst>(I->getTerminator()))
InlinedLPads.insert(II->getLandingPadInst());
LandingPadInst *OuterLPad = Invoke.getLandingPadInst();
for (LandingPadInst *InlinedLPad : InlinedLPads) {
unsigned OuterNum = OuterLPad->getNumClauses();
InlinedLPad->reserveClauses(OuterNum);
for (unsigned OuterIdx = 0; OuterIdx != OuterNum; ++OuterIdx)
InlinedLPad->addClause(OuterLPad->getClause(OuterIdx));
if (OuterLPad->isCleanup())
InlinedLPad->setCleanup(true);
}
for (Function::iterator BB = FirstNewBlock, E = Caller->end(); BB != E; ++BB){
if (InlinedCodeInfo.ContainsCalls)
HandleCallsInBlockInlinedThroughInvoke(BB, Invoke);
if (ResumeInst *RI = dyn_cast<ResumeInst>(BB->getTerminator()))
Invoke.forwardResume(RI, InlinedLPads);
}
InvokeDest->removePredecessor(II->getParent());
}
static void CloneAliasScopeMetadata(CallSite CS, ValueToValueMapTy &VMap) {
const Function *CalledFunc = CS.getCalledFunction();
SetVector<const MDNode *> MD;
for (Function::const_iterator I = CalledFunc->begin(), IE = CalledFunc->end();
I != IE; ++I)
for (BasicBlock::const_iterator J = I->begin(), JE = I->end(); J != JE; ++J) {
if (const MDNode *M = J->getMetadata(LLVMContext::MD_alias_scope))
MD.insert(M);
if (const MDNode *M = J->getMetadata(LLVMContext::MD_noalias))
MD.insert(M);
}
if (MD.empty())
return;
SmallVector<const Metadata *, 16> Queue(MD.begin(), MD.end());
while (!Queue.empty()) {
const MDNode *M = cast<MDNode>(Queue.pop_back_val());
for (unsigned i = 0, ie = M->getNumOperands(); i != ie; ++i)
if (const MDNode *M1 = dyn_cast<MDNode>(M->getOperand(i)))
if (MD.insert(M1))
Queue.push_back(M1);
}
SmallVector<TempMDTuple, 16> DummyNodes;
DenseMap<const MDNode *, TrackingMDNodeRef> MDMap;
for (SetVector<const MDNode *>::iterator I = MD.begin(), IE = MD.end();
I != IE; ++I) {
DummyNodes.push_back(MDTuple::getTemporary(CalledFunc->getContext(), None));
MDMap[*I].reset(DummyNodes.back().get());
}
for (SetVector<const MDNode *>::iterator I = MD.begin(), IE = MD.end();
I != IE; ++I) {
SmallVector<Metadata *, 4> NewOps;
for (unsigned i = 0, ie = (*I)->getNumOperands(); i != ie; ++i) {
const Metadata *V = (*I)->getOperand(i);
if (const MDNode *M = dyn_cast<MDNode>(V))
NewOps.push_back(MDMap[M]);
else
NewOps.push_back(const_cast<Metadata *>(V));
}
MDNode *NewM = MDNode::get(CalledFunc->getContext(), NewOps);
MDTuple *TempM = cast<MDTuple>(MDMap[*I]);
assert(TempM->isTemporary() && "Expected temporary node");
TempM->replaceAllUsesWith(NewM);
}
for (ValueToValueMapTy::iterator VMI = VMap.begin(), VMIE = VMap.end();
VMI != VMIE; ++VMI) {
if (!VMI->second)
continue;
Instruction *NI = dyn_cast<Instruction>(VMI->second);
if (!NI)
continue;
if (MDNode *M = NI->getMetadata(LLVMContext::MD_alias_scope)) {
MDNode *NewMD = MDMap[M];
if (MDNode *CSM =
CS.getInstruction()->getMetadata(LLVMContext::MD_alias_scope))
NewMD = MDNode::concatenate(NewMD, CSM);
NI->setMetadata(LLVMContext::MD_alias_scope, NewMD);
} else if (NI->mayReadOrWriteMemory()) {
if (MDNode *M =
CS.getInstruction()->getMetadata(LLVMContext::MD_alias_scope))
NI->setMetadata(LLVMContext::MD_alias_scope, M);
}
if (MDNode *M = NI->getMetadata(LLVMContext::MD_noalias)) {
MDNode *NewMD = MDMap[M];
if (MDNode *CSM =
CS.getInstruction()->getMetadata(LLVMContext::MD_noalias))
NewMD = MDNode::concatenate(NewMD, CSM);
NI->setMetadata(LLVMContext::MD_noalias, NewMD);
} else if (NI->mayReadOrWriteMemory()) {
if (MDNode *M = CS.getInstruction()->getMetadata(LLVMContext::MD_noalias))
NI->setMetadata(LLVMContext::MD_noalias, M);
}
}
}
static void AddAliasScopeMetadata(CallSite CS, ValueToValueMapTy &VMap,
const DataLayout &DL, AliasAnalysis *AA) {
if (!EnableNoAliasConversion)
return;
const Function *CalledFunc = CS.getCalledFunction();
SmallVector<const Argument *, 4> NoAliasArgs;
for (Function::const_arg_iterator I = CalledFunc->arg_begin(),
E = CalledFunc->arg_end(); I != E; ++I) {
if (I->hasNoAliasAttr() && !I->hasNUses(0))
NoAliasArgs.push_back(I);
}
if (NoAliasArgs.empty())
return;
DominatorTree DT;
DT.recalculate(const_cast<Function&>(*CalledFunc));
DenseMap<const Argument *, MDNode *> NewScopes;
MDBuilder MDB(CalledFunc->getContext());
MDNode *NewDomain =
MDB.createAnonymousAliasScopeDomain(CalledFunc->getName());
for (unsigned i = 0, e = NoAliasArgs.size(); i != e; ++i) {
const Argument *A = NoAliasArgs[i];
std::string Name = CalledFunc->getName();
if (A->hasName()) {
Name += ": %";
Name += A->getName();
} else {
Name += ": argument ";
Name += utostr(i);
}
MDNode *NewScope = MDB.createAnonymousAliasScope(NewDomain, Name);
NewScopes.insert(std::make_pair(A, NewScope));
}
for (ValueToValueMapTy::iterator VMI = VMap.begin(), VMIE = VMap.end();
VMI != VMIE; ++VMI) {
if (const Instruction *I = dyn_cast<Instruction>(VMI->first)) {
if (!VMI->second)
continue;
Instruction *NI = dyn_cast<Instruction>(VMI->second);
if (!NI)
continue;
bool IsArgMemOnlyCall = false, IsFuncCall = false;
SmallVector<const Value *, 2> PtrArgs;
if (const LoadInst *LI = dyn_cast<LoadInst>(I))
PtrArgs.push_back(LI->getPointerOperand());
else if (const StoreInst *SI = dyn_cast<StoreInst>(I))
PtrArgs.push_back(SI->getPointerOperand());
else if (const VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
PtrArgs.push_back(VAAI->getPointerOperand());
else if (const AtomicCmpXchgInst *CXI = dyn_cast<AtomicCmpXchgInst>(I))
PtrArgs.push_back(CXI->getPointerOperand());
else if (const AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(I))
PtrArgs.push_back(RMWI->getPointerOperand());
else if (ImmutableCallSite ICS = ImmutableCallSite(I)) {
if (ICS.doesNotAccessMemory())
continue;
IsFuncCall = true;
if (AA) {
AliasAnalysis::ModRefBehavior MRB = AA->getModRefBehavior(ICS);
if (MRB == AliasAnalysis::OnlyAccessesArgumentPointees ||
MRB == AliasAnalysis::OnlyReadsArgumentPointees)
IsArgMemOnlyCall = true;
}
for (ImmutableCallSite::arg_iterator AI = ICS.arg_begin(),
AE = ICS.arg_end(); AI != AE; ++AI) {
if (IsArgMemOnlyCall && !(*AI)->getType()->isPointerTy())
continue;
PtrArgs.push_back(*AI);
}
}
if (PtrArgs.empty() && !IsFuncCall)
continue;
SmallPtrSet<const Value *, 4> ObjSet;
SmallVector<Metadata *, 4> Scopes, NoAliases;
SmallSetVector<const Argument *, 4> NAPtrArgs;
for (unsigned i = 0, ie = PtrArgs.size(); i != ie; ++i) {
SmallVector<Value *, 4> Objects;
GetUnderlyingObjects(const_cast<Value*>(PtrArgs[i]),
Objects, DL, 0);
for (Value *O : Objects)
ObjSet.insert(O);
}
bool CanDeriveViaCapture = false, UsesAliasingPtr = false;
for (const Value *V : ObjSet) {
bool IsNonPtrConst = isa<ConstantInt>(V) || isa<ConstantFP>(V) ||
isa<ConstantPointerNull>(V) ||
isa<ConstantDataVector>(V) || isa<UndefValue>(V);
if (IsNonPtrConst)
continue;
if (const Argument *A = dyn_cast<Argument>(V)) {
if (!A->hasNoAliasAttr())
UsesAliasingPtr = true;
} else {
UsesAliasingPtr = true;
}
if (!isa<Argument>(V) &&
!isIdentifiedFunctionLocal(const_cast<Value*>(V)))
CanDeriveViaCapture = true;
}
if (IsFuncCall && !IsArgMemOnlyCall)
CanDeriveViaCapture = true;
for (const Argument *A : NoAliasArgs) {
if (!ObjSet.count(A) && (!CanDeriveViaCapture ||
!PointerMayBeCapturedBefore(A,
false,
false, I, &DT)))
NoAliases.push_back(NewScopes[A]);
}
if (!NoAliases.empty())
NI->setMetadata(LLVMContext::MD_noalias,
MDNode::concatenate(
NI->getMetadata(LLVMContext::MD_noalias),
MDNode::get(CalledFunc->getContext(), NoAliases)));
bool CanAddScopes = !UsesAliasingPtr;
if (CanAddScopes && IsFuncCall)
CanAddScopes = IsArgMemOnlyCall;
if (CanAddScopes)
for (const Argument *A : NoAliasArgs) {
if (ObjSet.count(A))
Scopes.push_back(NewScopes[A]);
}
if (!Scopes.empty())
NI->setMetadata(
LLVMContext::MD_alias_scope,
MDNode::concatenate(NI->getMetadata(LLVMContext::MD_alias_scope),
MDNode::get(CalledFunc->getContext(), Scopes)));
}
}
}
static void AddAlignmentAssumptions(CallSite CS, InlineFunctionInfo &IFI) {
if (!PreserveAlignmentAssumptions)
return;
auto &DL = CS.getCaller()->getParent()->getDataLayout();
DominatorTree DT;
bool DTCalculated = false;
Function *CalledFunc = CS.getCalledFunction();
for (Function::arg_iterator I = CalledFunc->arg_begin(),
E = CalledFunc->arg_end();
I != E; ++I) {
unsigned Align = I->getType()->isPointerTy() ? I->getParamAlignment() : 0;
if (Align && !I->hasByValOrInAllocaAttr() && !I->hasNUses(0)) {
if (!DTCalculated) {
DT.recalculate(const_cast<Function&>(*CS.getInstruction()->getParent()
->getParent()));
DTCalculated = true;
}
Value *Arg = CS.getArgument(I->getArgNo());
if (getKnownAlignment(Arg, DL, CS.getInstruction(),
&IFI.ACT->getAssumptionCache(*CalledFunc),
&DT) >= Align)
continue;
IRBuilder<>(CS.getInstruction())
.CreateAlignmentAssumption(DL, Arg, Align);
}
}
}
static void UpdateCallGraphAfterInlining(CallSite CS,
Function::iterator FirstNewBlock,
ValueToValueMapTy &VMap,
InlineFunctionInfo &IFI) {
CallGraph &CG = *IFI.CG;
const Function *Caller = CS.getInstruction()->getParent()->getParent();
const Function *Callee = CS.getCalledFunction();
CallGraphNode *CalleeNode = CG[Callee];
CallGraphNode *CallerNode = CG[Caller];
CallGraphNode::iterator I = CalleeNode->begin(), E = CalleeNode->end();
CallGraphNode::CalledFunctionsVector CallCache;
if (CalleeNode == CallerNode) {
CallCache.assign(I, E);
I = CallCache.begin();
E = CallCache.end();
}
for (; I != E; ++I) {
const Value *OrigCall = I->first;
ValueToValueMapTy::iterator VMI = VMap.find(OrigCall);
if (VMI == VMap.end() || VMI->second == nullptr)
continue;
Instruction *NewCall = dyn_cast<Instruction>(VMI->second);
if (!NewCall)
continue;
CallSite CS = CallSite(NewCall);
if (CS && CS.getCalledFunction() && CS.getCalledFunction()->isIntrinsic())
continue;
IFI.InlinedCalls.push_back(NewCall);
if (!I->second->getFunction())
if (Function *F = CallSite(NewCall).getCalledFunction()) {
CallerNode->addCalledFunction(CallSite(NewCall), CG[F]);
continue;
}
CallerNode->addCalledFunction(CallSite(NewCall), I->second);
}
CallerNode->removeCallEdgeFor(CS);
}
static void HandleByValArgumentInit(Value *Dst, Value *Src, Module *M,
BasicBlock *InsertBlock,
InlineFunctionInfo &IFI) {
Type *AggTy = cast<PointerType>(Src->getType())->getElementType();
IRBuilder<> Builder(InsertBlock->begin());
Value *Size = Builder.getInt64(M->getDataLayout().getTypeStoreSize(AggTy));
Builder.CreateMemCpy(Dst, Src, Size, 1);
}
static Value *HandleByValArgument(Value *Arg, Instruction *TheCall,
const Function *CalledFunc,
InlineFunctionInfo &IFI,
unsigned ByValAlignment) {
PointerType *ArgTy = cast<PointerType>(Arg->getType());
Type *AggTy = ArgTy->getElementType();
Function *Caller = TheCall->getParent()->getParent();
if (CalledFunc->onlyReadsMemory()) {
if (ByValAlignment <= 1) return Arg;
const DataLayout &DL = Caller->getParent()->getDataLayout();
if (getOrEnforceKnownAlignment(Arg, ByValAlignment, DL, TheCall,
&IFI.ACT->getAssumptionCache(*Caller)) >=
ByValAlignment)
return Arg;
}
unsigned Align =
Caller->getParent()->getDataLayout().getPrefTypeAlignment(AggTy);
Align = std::max(Align, ByValAlignment);
Value *NewAlloca = new AllocaInst(AggTy, nullptr, Align, Arg->getName(),
&*Caller->begin()->begin());
IFI.StaticAllocas.push_back(cast<AllocaInst>(NewAlloca));
return NewAlloca;
}
static bool isUsedByLifetimeMarker(Value *V) {
for (User *U : V->users()) {
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(U)) {
switch (II->getIntrinsicID()) {
default: break;
case Intrinsic::lifetime_start:
case Intrinsic::lifetime_end:
return true;
}
}
}
return false;
}
static bool hasLifetimeMarkers(AllocaInst *AI) {
Type *Ty = AI->getType();
Type *Int8PtrTy = Type::getInt8PtrTy(Ty->getContext(),
Ty->getPointerAddressSpace());
if (Ty == Int8PtrTy)
return isUsedByLifetimeMarker(AI);
for (User *U : AI->users()) {
if (U->getType() != Int8PtrTy) continue;
if (U->stripPointerCasts() != AI) continue;
if (isUsedByLifetimeMarker(U))
return true;
}
return false;
}
static DebugLoc
updateInlinedAtInfo(DebugLoc DL, DILocation *InlinedAtNode, LLVMContext &Ctx,
DenseMap<const DILocation *, DILocation *> &IANodes) {
SmallVector<DILocation *, 3> InlinedAtLocations;
DILocation *Last = InlinedAtNode;
DILocation *CurInlinedAt = DL;
while (DILocation *IA = CurInlinedAt->getInlinedAt()) {
if (DILocation *Found = IANodes[IA]) {
Last = Found;
break;
}
InlinedAtLocations.push_back(IA);
CurInlinedAt = IA;
}
for (auto I = InlinedAtLocations.rbegin(), E = InlinedAtLocations.rend();
I != E; ++I) {
const DILocation *MD = *I;
Last = IANodes[MD] = DILocation::getDistinct(
Ctx, MD->getLine(), MD->getColumn(), MD->getScope(), Last);
}
return DebugLoc::get(DL.getLine(), DL.getCol(), DL.getScope(), Last);
}
static void fixupLineNumbers(Function *Fn, Function::iterator FI,
Instruction *TheCall) {
DebugLoc TheCallDL = TheCall->getDebugLoc();
if (!TheCallDL)
return;
auto &Ctx = Fn->getContext();
DILocation *InlinedAtNode = TheCallDL;
InlinedAtNode = DILocation::getDistinct(
Ctx, InlinedAtNode->getLine(), InlinedAtNode->getColumn(),
InlinedAtNode->getScope(), InlinedAtNode->getInlinedAt());
DenseMap<const DILocation *, DILocation *> IANodes;
for (; FI != Fn->end(); ++FI) {
for (BasicBlock::iterator BI = FI->begin(), BE = FI->end();
BI != BE; ++BI) {
DebugLoc DL = BI->getDebugLoc();
if (!DL) {
if (auto *AI = dyn_cast<AllocaInst>(BI))
if (isa<Constant>(AI->getArraySize()))
continue;
BI->setDebugLoc(TheCallDL);
} else {
BI->setDebugLoc(updateInlinedAtInfo(DL, InlinedAtNode, BI->getContext(), IANodes));
}
}
}
}
bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI,
bool InsertLifetime) {
Instruction *TheCall = CS.getInstruction();
assert(TheCall->getParent() && TheCall->getParent()->getParent() &&
"Instruction not in function!");
IFI.reset();
const Function *CalledFunc = CS.getCalledFunction();
if (!CalledFunc || CalledFunc->isDeclaration() || CalledFunc->getFunctionType()->isVarArg()) return false;
bool MarkNoUnwind = CS.doesNotThrow();
BasicBlock *OrigBB = TheCall->getParent();
Function *Caller = OrigBB->getParent();
if (CalledFunc->hasGC()) {
if (!Caller->hasGC())
Caller->setGC(CalledFunc->getGC());
else if (CalledFunc->getGC() != Caller->getGC())
return false;
}
Value *CalleePersonality = nullptr;
for (Function::const_iterator I = CalledFunc->begin(), E = CalledFunc->end();
I != E; ++I)
if (const InvokeInst *II = dyn_cast<InvokeInst>(I->getTerminator())) {
const BasicBlock *BB = II->getUnwindDest();
const LandingPadInst *LP = BB->getLandingPadInst();
CalleePersonality = LP->getPersonalityFn();
break;
}
if (CalleePersonality) {
for (Function::const_iterator I = Caller->begin(), E = Caller->end();
I != E; ++I)
if (const InvokeInst *II = dyn_cast<InvokeInst>(I->getTerminator())) {
const BasicBlock *BB = II->getUnwindDest();
const LandingPadInst *LP = BB->getLandingPadInst();
if (LP->getPersonalityFn() != CalleePersonality)
return false;
break;
}
}
Function::iterator LastBlock = &Caller->back();
SmallVector<ReturnInst*, 8> Returns;
ClonedCodeInfo InlinedFunctionInfo;
Function::iterator FirstNewBlock;
{ ValueToValueMapTy VMap;
SmallVector<std::pair<Value*, Value*>, 4> ByValInit;
auto &DL = Caller->getParent()->getDataLayout();
assert(CalledFunc->arg_size() == CS.arg_size() &&
"No varargs calls can be inlined!");
CallSite::arg_iterator AI = CS.arg_begin();
unsigned ArgNo = 0;
for (Function::const_arg_iterator I = CalledFunc->arg_begin(),
E = CalledFunc->arg_end(); I != E; ++I, ++AI, ++ArgNo) {
Value *ActualArg = *AI;
if (CS.isByValArgument(ArgNo)) {
ActualArg = HandleByValArgument(ActualArg, TheCall, CalledFunc, IFI,
CalledFunc->getParamAlignment(ArgNo+1));
if (ActualArg != *AI)
ByValInit.push_back(std::make_pair(ActualArg, (Value*) *AI));
}
VMap[I] = ActualArg;
}
AddAlignmentAssumptions(CS, IFI);
CloneAndPruneFunctionInto(Caller, CalledFunc, VMap,
false, Returns, ".i",
&InlinedFunctionInfo, TheCall);
FirstNewBlock = LastBlock; ++FirstNewBlock;
for (std::pair<Value*, Value*> &Init : ByValInit)
HandleByValArgumentInit(Init.first, Init.second, Caller->getParent(),
FirstNewBlock, IFI);
if (IFI.CG)
UpdateCallGraphAfterInlining(CS, FirstNewBlock, VMap, IFI);
fixupLineNumbers(Caller, FirstNewBlock, TheCall);
CloneAliasScopeMetadata(CS, VMap);
AddAliasScopeMetadata(CS, VMap, DL, IFI.AA);
if (IFI.ACT)
IFI.ACT->getAssumptionCache(*Caller).clear();
}
{
BasicBlock::iterator InsertPoint = Caller->begin()->begin();
for (BasicBlock::iterator I = FirstNewBlock->begin(),
E = FirstNewBlock->end(); I != E; ) {
AllocaInst *AI = dyn_cast<AllocaInst>(I++);
if (!AI) continue;
if (AI->use_empty()) {
AI->eraseFromParent();
continue;
}
if (!isa<Constant>(AI->getArraySize()))
continue;
IFI.StaticAllocas.push_back(AI);
while (isa<AllocaInst>(I) &&
isa<Constant>(cast<AllocaInst>(I)->getArraySize())) {
IFI.StaticAllocas.push_back(cast<AllocaInst>(I));
++I;
}
Caller->getEntryBlock().getInstList().splice(InsertPoint,
FirstNewBlock->getInstList(),
AI, I);
}
DIBuilder DIB(*Caller->getParent());
for (auto &AI : IFI.StaticAllocas)
replaceDbgDeclareForAlloca(AI, AI, DIB, false);
}
bool InlinedMustTailCalls = false;
if (InlinedFunctionInfo.ContainsCalls) {
CallInst::TailCallKind CallSiteTailKind = CallInst::TCK_None;
if (CallInst *CI = dyn_cast<CallInst>(TheCall))
CallSiteTailKind = CI->getTailCallKind();
for (Function::iterator BB = FirstNewBlock, E = Caller->end(); BB != E;
++BB) {
for (Instruction &I : *BB) {
CallInst *CI = dyn_cast<CallInst>(&I);
if (!CI)
continue;
CallInst::TailCallKind ChildTCK = CI->getTailCallKind();
ChildTCK = std::min(CallSiteTailKind, ChildTCK);
CI->setTailCallKind(ChildTCK);
InlinedMustTailCalls |= CI->isMustTailCall();
if (MarkNoUnwind)
CI->setDoesNotThrow();
}
}
}
if (InsertLifetime && !IFI.StaticAllocas.empty()) {
IRBuilder<> builder(FirstNewBlock->begin());
for (unsigned ai = 0, ae = IFI.StaticAllocas.size(); ai != ae; ++ai) {
AllocaInst *AI = IFI.StaticAllocas[ai];
if (hasLifetimeMarkers(AI))
continue;
ConstantInt *AllocaSize = nullptr;
if (ConstantInt *AIArraySize =
dyn_cast<ConstantInt>(AI->getArraySize())) {
auto &DL = Caller->getParent()->getDataLayout();
Type *AllocaType = AI->getAllocatedType();
uint64_t AllocaTypeSize = DL.getTypeAllocSize(AllocaType);
uint64_t AllocaArraySize = AIArraySize->getLimitedValue();
if (AllocaArraySize == 0)
continue;
if (AllocaArraySize != ~0ULL &&
UINT64_MAX / AllocaArraySize >= AllocaTypeSize) {
AllocaSize = ConstantInt::get(Type::getInt64Ty(AI->getContext()),
AllocaArraySize * AllocaTypeSize);
}
}
builder.CreateLifetimeStart(AI, AllocaSize);
for (ReturnInst *RI : Returns) {
if (InlinedMustTailCalls &&
RI->getParent()->getTerminatingMustTailCall())
continue;
IRBuilder<>(RI).CreateLifetimeEnd(AI, AllocaSize);
}
}
}
if (InlinedFunctionInfo.ContainsDynamicAllocas) {
Module *M = Caller->getParent();
Function *StackSave = Intrinsic::getDeclaration(M, Intrinsic::stacksave);
Function *StackRestore=Intrinsic::getDeclaration(M,Intrinsic::stackrestore);
CallInst *SavedPtr = IRBuilder<>(FirstNewBlock, FirstNewBlock->begin())
.CreateCall(StackSave, "savedstack");
for (ReturnInst *RI : Returns) {
if (InlinedMustTailCalls && RI->getParent()->getTerminatingMustTailCall())
continue;
IRBuilder<>(RI).CreateCall(StackRestore, SavedPtr);
}
}
if (InvokeInst *II = dyn_cast<InvokeInst>(TheCall))
HandleInlinedInvoke(II, FirstNewBlock, InlinedFunctionInfo);
if (InlinedMustTailCalls) {
Type *NewRetTy = Caller->getReturnType();
bool NeedBitCast = !TheCall->use_empty() && TheCall->getType() != NewRetTy;
SmallVector<ReturnInst *, 8> NormalReturns;
for (ReturnInst *RI : Returns) {
CallInst *ReturnedMustTail =
RI->getParent()->getTerminatingMustTailCall();
if (!ReturnedMustTail) {
NormalReturns.push_back(RI);
continue;
}
if (!NeedBitCast)
continue;
BasicBlock *CurBB = RI->getParent();
auto *OldCast = dyn_cast_or_null<BitCastInst>(RI->getReturnValue());
RI->eraseFromParent();
if (OldCast)
OldCast->eraseFromParent();
IRBuilder<> Builder(CurBB);
Builder.CreateRet(Builder.CreateBitCast(ReturnedMustTail, NewRetTy));
}
std::swap(Returns, NormalReturns);
}
if (Returns.size() == 1 && std::distance(FirstNewBlock, Caller->end()) == 1) {
OrigBB->getInstList().splice(TheCall, FirstNewBlock->getInstList(),
FirstNewBlock->begin(), FirstNewBlock->end());
Caller->getBasicBlockList().pop_back();
if (InvokeInst *II = dyn_cast<InvokeInst>(TheCall)) {
BranchInst *NewBr = BranchInst::Create(II->getNormalDest(), TheCall);
NewBr->setDebugLoc(Returns[0]->getDebugLoc());
}
if (!TheCall->use_empty()) {
ReturnInst *R = Returns[0];
if (TheCall == R->getReturnValue())
TheCall->replaceAllUsesWith(UndefValue::get(TheCall->getType()));
else
TheCall->replaceAllUsesWith(R->getReturnValue());
}
TheCall->eraseFromParent();
Returns[0]->eraseFromParent();
return true;
}
BasicBlock *AfterCallBB;
BranchInst *CreatedBranchToNormalDest = nullptr;
if (InvokeInst *II = dyn_cast<InvokeInst>(TheCall)) {
CreatedBranchToNormalDest = BranchInst::Create(II->getNormalDest(), TheCall);
AfterCallBB = OrigBB->splitBasicBlock(CreatedBranchToNormalDest,
CalledFunc->getName()+".exit");
} else { AfterCallBB = OrigBB->splitBasicBlock(TheCall,
CalledFunc->getName()+".exit");
}
TerminatorInst *Br = OrigBB->getTerminator();
assert(Br && Br->getOpcode() == Instruction::Br &&
"splitBasicBlock broken!");
Br->setOperand(0, FirstNewBlock);
Caller->getBasicBlockList().splice(AfterCallBB, Caller->getBasicBlockList(),
FirstNewBlock, Caller->end());
Type *RTy = CalledFunc->getReturnType();
PHINode *PHI = nullptr;
if (Returns.size() > 1) {
if (!TheCall->use_empty()) {
PHI = PHINode::Create(RTy, Returns.size(), TheCall->getName(),
AfterCallBB->begin());
TheCall->replaceAllUsesWith(PHI);
}
if (PHI) {
for (unsigned i = 0, e = Returns.size(); i != e; ++i) {
ReturnInst *RI = Returns[i];
assert(RI->getReturnValue()->getType() == PHI->getType() &&
"Ret value not consistent in function!");
PHI->addIncoming(RI->getReturnValue(), RI->getParent());
}
}
DebugLoc Loc;
for (unsigned i = 0, e = Returns.size(); i != e; ++i) {
ReturnInst *RI = Returns[i];
BranchInst* BI = BranchInst::Create(AfterCallBB, RI);
Loc = RI->getDebugLoc();
BI->setDebugLoc(Loc);
RI->eraseFromParent();
}
if (CreatedBranchToNormalDest)
CreatedBranchToNormalDest->setDebugLoc(Loc);
} else if (!Returns.empty()) {
if (!TheCall->use_empty()) {
if (TheCall == Returns[0]->getReturnValue())
TheCall->replaceAllUsesWith(UndefValue::get(TheCall->getType()));
else
TheCall->replaceAllUsesWith(Returns[0]->getReturnValue());
}
BasicBlock *ReturnBB = Returns[0]->getParent();
ReturnBB->replaceAllUsesWith(AfterCallBB);
AfterCallBB->getInstList().splice(AfterCallBB->begin(),
ReturnBB->getInstList());
if (CreatedBranchToNormalDest)
CreatedBranchToNormalDest->setDebugLoc(Returns[0]->getDebugLoc());
Returns[0]->eraseFromParent();
ReturnBB->eraseFromParent();
} else if (!TheCall->use_empty()) {
TheCall->replaceAllUsesWith(UndefValue::get(TheCall->getType()));
}
TheCall->eraseFromParent();
if (InlinedMustTailCalls && pred_begin(AfterCallBB) == pred_end(AfterCallBB))
AfterCallBB->eraseFromParent();
assert(cast<BranchInst>(Br)->isUnconditional() && "splitBasicBlock broken!");
BasicBlock *CalleeEntry = cast<BranchInst>(Br)->getSuccessor(0);
CalleeEntry->replaceAllUsesWith(OrigBB); OrigBB->getInstList().splice(Br, CalleeEntry->getInstList());
OrigBB->getInstList().erase(Br);
Caller->getBasicBlockList().erase(CalleeEntry);
if (PHI) {
auto &DL = Caller->getParent()->getDataLayout();
if (Value *V = SimplifyInstruction(PHI, DL, nullptr, nullptr,
&IFI.ACT->getAssumptionCache(*Caller))) {
PHI->replaceAllUsesWith(V);
PHI->eraseFromParent();
}
}
return true;
}