#include "llvm/AutoUpgrade.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
+#include "llvm/Instruction.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/IntrinsicInst.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/CallSite.h"
+#include "llvm/Support/CFG.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/IRBuilder.h"
#include <cstring>
return false;
Name = Name.substr(5); // Strip off "llvm."
- const FunctionType *FTy = F->getFunctionType();
+ FunctionType *FTy = F->getFunctionType();
Module *M = F->getParent();
switch (Name[0]) {
default: break;
+ case 'i':
+ // This upgrades the old llvm.init.trampoline to the new
+ // llvm.init.trampoline and llvm.adjust.trampoline pair.
+ if (Name == "init.trampoline") {
+ // The new llvm.init.trampoline returns nothing.
+ if (FTy->getReturnType()->isVoidTy())
+ break;
+
+ assert(FTy->getNumParams() == 3 && "old init.trampoline takes 3 args!");
+
+ // Change the name of the old intrinsic so that we can play with its type.
+ std::string NameTmp = F->getName();
+ F->setName("");
+ NewFn = cast<Function>(M->getOrInsertFunction(
+ NameTmp,
+ Type::getVoidTy(M->getContext()),
+ FTy->getParamType(0), FTy->getParamType(1),
+ FTy->getParamType(2), (Type *)0));
+ return true;
+ }
case 'p':
// This upgrades the llvm.prefetch intrinsic to accept one more parameter,
// which is a instruction / data cache identifier. The old version only
F->getName() == "llvm.x86.sse2.loadu.dq" ||
F->getName() == "llvm.x86.sse2.loadu.pd") {
// Convert to a native, unaligned load.
- const Type *VecTy = CI->getType();
- const Type *IntTy = IntegerType::get(C, 128);
+ Type *VecTy = CI->getType();
+ Type *IntTy = IntegerType::get(C, 128);
IRBuilder<> Builder(C);
Builder.SetInsertPoint(CI->getParent(), CI);
case Intrinsic::prefetch: {
IRBuilder<> Builder(C);
Builder.SetInsertPoint(CI->getParent(), CI);
- const llvm::Type *I32Ty = llvm::Type::getInt32Ty(CI->getContext());
+ llvm::Type *I32Ty = llvm::Type::getInt32Ty(CI->getContext());
// Add the extra "data cache" argument
Value *Operands[4] = { CI->getArgOperand(0), CI->getArgOperand(1),
CI->getArgOperand(2),
llvm::ConstantInt::get(I32Ty, 1) };
- CallInst *NewCI = CallInst::Create(NewFn, Operands, Operands+4,
+ CallInst *NewCI = CallInst::Create(NewFn, Operands,
CI->getName(), CI);
NewCI->setTailCall(CI->isTailCall());
NewCI->setCallingConv(CI->getCallingConv());
CI->eraseFromParent();
break;
}
+ case Intrinsic::init_trampoline: {
+
+ // Transform
+ // %tramp = call i8* llvm.init.trampoline (i8* x, i8* y, i8* z)
+ // to
+ // call void llvm.init.trampoline (i8* %x, i8* %y, i8* %z)
+ // %tramp = call i8* llvm.adjust.trampoline (i8* %x)
+
+ Function *AdjustTrampolineFn =
+ cast<Function>(Intrinsic::getDeclaration(F->getParent(),
+ Intrinsic::adjust_trampoline));
+
+ IRBuilder<> Builder(C);
+ Builder.SetInsertPoint(CI);
+
+ Builder.CreateCall3(NewFn, CI->getArgOperand(0), CI->getArgOperand(1),
+ CI->getArgOperand(2));
+
+ CallInst *AdjustCall = Builder.CreateCall(AdjustTrampolineFn,
+ CI->getArgOperand(0),
+ CI->getName());
+ if (!CI->use_empty())
+ CI->replaceAllUsesWith(AdjustCall);
+ CI->eraseFromParent();
+ break;
+ }
}
}
}
}
}
+
+/// FindExnAndSelIntrinsics - Find the eh_exception and eh_selector intrinsic
+/// calls reachable from the unwind basic block.
+static void FindExnAndSelIntrinsics(BasicBlock *BB, CallInst *&Exn,
+ CallInst *&Sel,
+ SmallPtrSet<BasicBlock*, 8> &Visited) {
+ if (!Visited.insert(BB)) return;
+
+ for (BasicBlock::iterator
+ I = BB->begin(), E = BB->end(); I != E; ++I) {
+ if (CallInst *CI = dyn_cast<CallInst>(I)) {
+ switch (CI->getCalledFunction()->getIntrinsicID()) {
+ default: break;
+ case Intrinsic::eh_exception:
+ assert(!Exn && "Found more than one eh.exception call!");
+ Exn = CI;
+ break;
+ case Intrinsic::eh_selector:
+ assert(!Sel && "Found more than one eh.selector call!");
+ Sel = CI;
+ break;
+ }
+
+ if (Exn && Sel) return;
+ }
+ }
+
+ if (Exn && Sel) return;
+
+ for (succ_iterator I = succ_begin(BB), E = succ_end(BB); I != E; ++I) {
+ FindExnAndSelIntrinsics(*I, Exn, Sel, Visited);
+ if (Exn && Sel) return;
+ }
+}
+
+/// TransferClausesToLandingPadInst - Transfer the exception handling clauses
+/// from the eh_selector call to the new landingpad instruction.
+static void TransferClausesToLandingPadInst(LandingPadInst *LPI,
+ CallInst *EHSel) {
+ LLVMContext &Context = LPI->getContext();
+ unsigned N = EHSel->getNumArgOperands();
+
+ for (unsigned i = N - 1; i > 1; --i) {
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(EHSel->getArgOperand(i))){
+ unsigned FilterLength = CI->getZExtValue();
+ unsigned FirstCatch = i + FilterLength + !FilterLength;
+ assert(FirstCatch <= N && "Invalid filter length");
+
+ if (FirstCatch < N)
+ for (unsigned j = FirstCatch; j < N; ++j) {
+ Value *Val = EHSel->getArgOperand(j);
+ if (!Val->hasName() || Val->getName() != "llvm.eh.catch.all.value") {
+ LPI->addClause(EHSel->getArgOperand(j));
+ } else {
+ GlobalVariable *GV = cast<GlobalVariable>(Val);
+ LPI->addClause(GV->getInitializer());
+ }
+ }
+
+ if (!FilterLength) {
+ // Cleanup.
+ LPI->setCleanup(true);
+ } else {
+ // Filter.
+ SmallVector<Constant *, 4> TyInfo;
+ TyInfo.reserve(FilterLength - 1);
+ for (unsigned j = i + 1; j < FirstCatch; ++j)
+ TyInfo.push_back(cast<Constant>(EHSel->getArgOperand(j)));
+ ArrayType *AType =
+ ArrayType::get(!TyInfo.empty() ? TyInfo[0]->getType() :
+ PointerType::getUnqual(Type::getInt8Ty(Context)),
+ TyInfo.size());
+ LPI->addClause(ConstantArray::get(AType, TyInfo));
+ }
+
+ N = i;
+ }
+ }
+
+ if (N > 2)
+ for (unsigned j = 2; j < N; ++j) {
+ Value *Val = EHSel->getArgOperand(j);
+ if (!Val->hasName() || Val->getName() != "llvm.eh.catch.all.value") {
+ LPI->addClause(EHSel->getArgOperand(j));
+ } else {
+ GlobalVariable *GV = cast<GlobalVariable>(Val);
+ LPI->addClause(GV->getInitializer());
+ }
+ }
+}
+
+/// This function upgrades the old pre-3.0 exception handling system to the new
+/// one. N.B. This will be removed in 3.1.
+void llvm::UpgradeExceptionHandling(Module *M) {
+ Function *EHException = M->getFunction("llvm.eh.exception");
+ Function *EHSelector = M->getFunction("llvm.eh.selector");
+ if (!EHException || !EHSelector)
+ return;
+
+ LLVMContext &Context = M->getContext();
+ Type *ExnTy = PointerType::getUnqual(Type::getInt8Ty(Context));
+ Type *SelTy = Type::getInt32Ty(Context);
+ Type *LPadSlotTy = StructType::get(ExnTy, SelTy, NULL);
+
+ // This map links the invoke instruction with the eh.exception and eh.selector
+ // calls associated with it.
+ DenseMap<InvokeInst*, std::pair<Value*, Value*> > InvokeToIntrinsicsMap;
+ for (Module::iterator
+ I = M->begin(), E = M->end(); I != E; ++I) {
+ Function &F = *I;
+
+ for (Function::iterator
+ II = F.begin(), IE = F.end(); II != IE; ++II) {
+ BasicBlock *BB = &*II;
+ InvokeInst *Inst = dyn_cast<InvokeInst>(BB->getTerminator());
+ if (!Inst) continue;
+ BasicBlock *UnwindDest = Inst->getUnwindDest();
+ if (UnwindDest->isLandingPad()) continue; // Already converted.
+
+ SmallPtrSet<BasicBlock*, 8> Visited;
+ CallInst *Exn = 0;
+ CallInst *Sel = 0;
+ FindExnAndSelIntrinsics(UnwindDest, Exn, Sel, Visited);
+ assert(Exn && Sel && "Cannot find eh.exception and eh.selector calls!");
+ InvokeToIntrinsicsMap[Inst] = std::make_pair(Exn, Sel);
+ }
+ }
+
+ // This map stores the slots where the exception object and selector value are
+ // stored within a function.
+ DenseMap<Function*, std::pair<Value*, Value*> > FnToLPadSlotMap;
+ SmallPtrSet<Instruction*, 32> DeadInsts;
+ for (DenseMap<InvokeInst*, std::pair<Value*, Value*> >::iterator
+ I = InvokeToIntrinsicsMap.begin(), E = InvokeToIntrinsicsMap.end();
+ I != E; ++I) {
+ InvokeInst *Invoke = I->first;
+ BasicBlock *UnwindDest = Invoke->getUnwindDest();
+ Function *F = UnwindDest->getParent();
+ std::pair<Value*, Value*> EHIntrinsics = I->second;
+ CallInst *Exn = cast<CallInst>(EHIntrinsics.first);
+ CallInst *Sel = cast<CallInst>(EHIntrinsics.second);
+
+ // Store the exception object and selector value in the entry block.
+ Value *ExnSlot = 0;
+ Value *SelSlot = 0;
+ if (!FnToLPadSlotMap[F].first) {
+ BasicBlock *Entry = &F->front();
+ ExnSlot = new AllocaInst(ExnTy, "exn", Entry->getTerminator());
+ SelSlot = new AllocaInst(SelTy, "sel", Entry->getTerminator());
+ FnToLPadSlotMap[F] = std::make_pair(ExnSlot, SelSlot);
+ } else {
+ ExnSlot = FnToLPadSlotMap[F].first;
+ SelSlot = FnToLPadSlotMap[F].second;
+ }
+
+ if (!UnwindDest->getSinglePredecessor()) {
+ // The unwind destination doesn't have a single predecessor. Create an
+ // unwind destination which has only one predecessor.
+ BasicBlock *NewBB = BasicBlock::Create(Context, "new.lpad",
+ UnwindDest->getParent());
+ BranchInst::Create(UnwindDest, NewBB);
+ Invoke->setUnwindDest(NewBB);
+
+ // Fix up any PHIs in the original unwind destination block.
+ for (BasicBlock::iterator
+ II = UnwindDest->begin(); isa<PHINode>(II); ++II) {
+ PHINode *PN = cast<PHINode>(II);
+ int Idx = PN->getBasicBlockIndex(Invoke->getParent());
+ if (Idx == -1) continue;
+ PN->setIncomingBlock(Idx, NewBB);
+ }
+
+ UnwindDest = NewBB;
+ }
+
+ IRBuilder<> Builder(Context);
+ Builder.SetInsertPoint(UnwindDest, UnwindDest->getFirstInsertionPt());
+
+ Value *PersFn = Sel->getArgOperand(1);
+ LandingPadInst *LPI = Builder.CreateLandingPad(LPadSlotTy, PersFn, 0);
+ Value *LPExn = Builder.CreateExtractValue(LPI, 0);
+ Value *LPSel = Builder.CreateExtractValue(LPI, 1);
+ Builder.CreateStore(LPExn, ExnSlot);
+ Builder.CreateStore(LPSel, SelSlot);
+
+ TransferClausesToLandingPadInst(LPI, Sel);
+
+ DeadInsts.insert(Exn);
+ DeadInsts.insert(Sel);
+ }
+
+ // Replace the old intrinsic calls with the values from the landingpad
+ // instruction(s). These values were stored in allocas for us to use here.
+ for (DenseMap<InvokeInst*, std::pair<Value*, Value*> >::iterator
+ I = InvokeToIntrinsicsMap.begin(), E = InvokeToIntrinsicsMap.end();
+ I != E; ++I) {
+ std::pair<Value*, Value*> EHIntrinsics = I->second;
+ CallInst *Exn = cast<CallInst>(EHIntrinsics.first);
+ CallInst *Sel = cast<CallInst>(EHIntrinsics.second);
+ BasicBlock *Parent = Exn->getParent();
+
+ std::pair<Value*,Value*> ExnSelSlots = FnToLPadSlotMap[Parent->getParent()];
+
+ IRBuilder<> Builder(Context);
+ Builder.SetInsertPoint(Parent, Exn);
+ LoadInst *LPExn = Builder.CreateLoad(ExnSelSlots.first, "exn.load");
+ LoadInst *LPSel = Builder.CreateLoad(ExnSelSlots.second, "sel.load");
+
+ Exn->replaceAllUsesWith(LPExn);
+ Sel->replaceAllUsesWith(LPSel);
+ }
+
+ // Remove the dead instructions.
+ for (SmallPtrSet<Instruction*, 32>::iterator
+ I = DeadInsts.begin(), E = DeadInsts.end(); I != E; ++I) {
+ Instruction *Inst = *I;
+ Inst->eraseFromParent();
+ }
+
+ // Replace calls to "llvm.eh.resume" with the 'resume' instruction. Load the
+ // exception and selector values from the stored place.
+ Function *EHResume = M->getFunction("llvm.eh.resume");
+ if (!EHResume) return;
+
+ while (!EHResume->use_empty()) {
+ CallInst *Resume = cast<CallInst>(EHResume->use_back());
+ BasicBlock *BB = Resume->getParent();
+
+ IRBuilder<> Builder(Context);
+ Builder.SetInsertPoint(BB, Resume);
+
+ Value *LPadVal =
+ Builder.CreateInsertValue(UndefValue::get(LPadSlotTy),
+ Resume->getArgOperand(0), 0, "lpad.val");
+ LPadVal = Builder.CreateInsertValue(LPadVal, Resume->getArgOperand(1),
+ 1, "lpad.val");
+ Builder.CreateResume(LPadVal);
+
+ // Remove all instructions after the 'resume.'
+ BasicBlock::iterator I = Resume;
+ while (I != BB->end()) {
+ Instruction *Inst = &*I++;
+ Inst->eraseFromParent();
+ }
+ }
+}
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