Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo".  That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

1 files changed, 0 insertions, 491 deletions

diff --git a/contrib/llvm/lib/CodeGen/SjLjEHPrepare.cpp b/contrib/llvm/lib/CodeGen/SjLjEHPrepare.cpp
deleted file mode 100644
index 23e5ce0acae8..000000000000
--- a/contrib/llvm/lib/CodeGen/SjLjEHPrepare.cpp
+++ /dev/null
@@ -1,491 +0,0 @@
-//===- SjLjEHPrepare.cpp - Eliminate Invoke & Unwind instructions ---------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This transformation is designed for use by code generators which use SjLj
-// based exception handling.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ADT/SetVector.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/Transforms/Utils/Local.h"
-#include "llvm/CodeGen/Passes.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/IRBuilder.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Intrinsics.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-using namespace llvm;
-
-#define DEBUG_TYPE "sjljehprepare"
-
-STATISTIC(NumInvokes, "Number of invokes replaced");
-STATISTIC(NumSpilled, "Number of registers live across unwind edges");
-
-namespace {
-class SjLjEHPrepare : public FunctionPass {
-  Type *doubleUnderDataTy;
-  Type *doubleUnderJBufTy;
-  Type *FunctionContextTy;
-  FunctionCallee RegisterFn;
-  FunctionCallee UnregisterFn;
-  Function *BuiltinSetupDispatchFn;
-  Function *FrameAddrFn;
-  Function *StackAddrFn;
-  Function *StackRestoreFn;
-  Function *LSDAAddrFn;
-  Function *CallSiteFn;
-  Function *FuncCtxFn;
-  AllocaInst *FuncCtx;
-
-public:
-  static char ID; // Pass identification, replacement for typeid
-  explicit SjLjEHPrepare() : FunctionPass(ID) {}
-  bool doInitialization(Module &M) override;
-  bool runOnFunction(Function &F) override;
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {}
-  StringRef getPassName() const override {
-    return "SJLJ Exception Handling preparation";
-  }
-
-private:
-  bool setupEntryBlockAndCallSites(Function &F);
-  void substituteLPadValues(LandingPadInst *LPI, Value *ExnVal, Value *SelVal);
-  Value *setupFunctionContext(Function &F, ArrayRef<LandingPadInst *> LPads);
-  void lowerIncomingArguments(Function &F);
-  void lowerAcrossUnwindEdges(Function &F, ArrayRef<InvokeInst *> Invokes);
-  void insertCallSiteStore(Instruction *I, int Number);
-};
-} // end anonymous namespace
-
-char SjLjEHPrepare::ID = 0;
-INITIALIZE_PASS(SjLjEHPrepare, DEBUG_TYPE, "Prepare SjLj exceptions",
-                false, false)
-
-// Public Interface To the SjLjEHPrepare pass.
-FunctionPass *llvm::createSjLjEHPreparePass() { return new SjLjEHPrepare(); }
-// doInitialization - Set up decalarations and types needed to process
-// exceptions.
-bool SjLjEHPrepare::doInitialization(Module &M) {
-  // Build the function context structure.
-  // builtin_setjmp uses a five word jbuf
-  Type *VoidPtrTy = Type::getInt8PtrTy(M.getContext());
-  Type *Int32Ty = Type::getInt32Ty(M.getContext());
-  doubleUnderDataTy = ArrayType::get(Int32Ty, 4);
-  doubleUnderJBufTy = ArrayType::get(VoidPtrTy, 5);
-  FunctionContextTy = StructType::get(VoidPtrTy,         // __prev
-                                      Int32Ty,           // call_site
-                                      doubleUnderDataTy, // __data
-                                      VoidPtrTy,         // __personality
-                                      VoidPtrTy,         // __lsda
-                                      doubleUnderJBufTy  // __jbuf
-                                      );
-
-  return true;
-}
-
-/// insertCallSiteStore - Insert a store of the call-site value to the
-/// function context
-void SjLjEHPrepare::insertCallSiteStore(Instruction *I, int Number) {
-  IRBuilder<> Builder(I);
-
-  // Get a reference to the call_site field.
-  Type *Int32Ty = Type::getInt32Ty(I->getContext());
-  Value *Zero = ConstantInt::get(Int32Ty, 0);
-  Value *One = ConstantInt::get(Int32Ty, 1);
-  Value *Idxs[2] = { Zero, One };
-  Value *CallSite =
-      Builder.CreateGEP(FunctionContextTy, FuncCtx, Idxs, "call_site");
-
-  // Insert a store of the call-site number
-  ConstantInt *CallSiteNoC =
-      ConstantInt::get(Type::getInt32Ty(I->getContext()), Number);
-  Builder.CreateStore(CallSiteNoC, CallSite, true /*volatile*/);
-}
-
-/// MarkBlocksLiveIn - Insert BB and all of its predecessors into LiveBBs until
-/// we reach blocks we've already seen.
-static void MarkBlocksLiveIn(BasicBlock *BB,
-                             SmallPtrSetImpl<BasicBlock *> &LiveBBs) {
-  if (!LiveBBs.insert(BB).second)
-    return; // already been here.
-
-  df_iterator_default_set<BasicBlock*> Visited;
-
-  for (BasicBlock *B : inverse_depth_first_ext(BB, Visited))
-    LiveBBs.insert(B);
-
-}
-
-/// substituteLPadValues - Substitute the values returned by the landingpad
-/// instruction with those returned by the personality function.
-void SjLjEHPrepare::substituteLPadValues(LandingPadInst *LPI, Value *ExnVal,
-                                         Value *SelVal) {
-  SmallVector<Value *, 8> UseWorkList(LPI->user_begin(), LPI->user_end());
-  while (!UseWorkList.empty()) {
-    Value *Val = UseWorkList.pop_back_val();
-    auto *EVI = dyn_cast<ExtractValueInst>(Val);
-    if (!EVI)
-      continue;
-    if (EVI->getNumIndices() != 1)
-      continue;
-    if (*EVI->idx_begin() == 0)
-      EVI->replaceAllUsesWith(ExnVal);
-    else if (*EVI->idx_begin() == 1)
-      EVI->replaceAllUsesWith(SelVal);
-    if (EVI->use_empty())
-      EVI->eraseFromParent();
-  }
-
-  if (LPI->use_empty())
-    return;
-
-  // There are still some uses of LPI. Construct an aggregate with the exception
-  // values and replace the LPI with that aggregate.
-  Type *LPadType = LPI->getType();
-  Value *LPadVal = UndefValue::get(LPadType);
-  auto *SelI = cast<Instruction>(SelVal);
-  IRBuilder<> Builder(SelI->getParent(), std::next(SelI->getIterator()));
-  LPadVal = Builder.CreateInsertValue(LPadVal, ExnVal, 0, "lpad.val");
-  LPadVal = Builder.CreateInsertValue(LPadVal, SelVal, 1, "lpad.val");
-
-  LPI->replaceAllUsesWith(LPadVal);
-}
-
-/// setupFunctionContext - Allocate the function context on the stack and fill
-/// it with all of the data that we know at this point.
-Value *SjLjEHPrepare::setupFunctionContext(Function &F,
-                                           ArrayRef<LandingPadInst *> LPads) {
-  BasicBlock *EntryBB = &F.front();
-
-  // Create an alloca for the incoming jump buffer ptr and the new jump buffer
-  // that needs to be restored on all exits from the function. This is an alloca
-  // because the value needs to be added to the global context list.
-  auto &DL = F.getParent()->getDataLayout();
-  unsigned Align = DL.getPrefTypeAlignment(FunctionContextTy);
-  FuncCtx = new AllocaInst(FunctionContextTy, DL.getAllocaAddrSpace(),
-                           nullptr, Align, "fn_context", &EntryBB->front());
-
-  // Fill in the function context structure.
-  for (LandingPadInst *LPI : LPads) {
-    IRBuilder<> Builder(LPI->getParent(),
-                        LPI->getParent()->getFirstInsertionPt());
-
-    // Reference the __data field.
-    Value *FCData =
-        Builder.CreateConstGEP2_32(FunctionContextTy, FuncCtx, 0, 2, "__data");
-
-    // The exception values come back in context->__data[0].
-    Type *Int32Ty = Type::getInt32Ty(F.getContext());
-    Value *ExceptionAddr = Builder.CreateConstGEP2_32(doubleUnderDataTy, FCData,
-                                                      0, 0, "exception_gep");
-    Value *ExnVal = Builder.CreateLoad(Int32Ty, ExceptionAddr, true, "exn_val");
-    ExnVal = Builder.CreateIntToPtr(ExnVal, Builder.getInt8PtrTy());
-
-    Value *SelectorAddr = Builder.CreateConstGEP2_32(doubleUnderDataTy, FCData,
-                                                     0, 1, "exn_selector_gep");
-    Value *SelVal =
-        Builder.CreateLoad(Int32Ty, SelectorAddr, true, "exn_selector_val");
-
-    substituteLPadValues(LPI, ExnVal, SelVal);
-  }
-
-  // Personality function
-  IRBuilder<> Builder(EntryBB->getTerminator());
-  Value *PersonalityFn = F.getPersonalityFn();
-  Value *PersonalityFieldPtr = Builder.CreateConstGEP2_32(
-      FunctionContextTy, FuncCtx, 0, 3, "pers_fn_gep");
-  Builder.CreateStore(
-      Builder.CreateBitCast(PersonalityFn, Builder.getInt8PtrTy()),
-      PersonalityFieldPtr, /*isVolatile=*/true);
-
-  // LSDA address
-  Value *LSDA = Builder.CreateCall(LSDAAddrFn, {}, "lsda_addr");
-  Value *LSDAFieldPtr =
-      Builder.CreateConstGEP2_32(FunctionContextTy, FuncCtx, 0, 4, "lsda_gep");
-  Builder.CreateStore(LSDA, LSDAFieldPtr, /*isVolatile=*/true);
-
-  return FuncCtx;
-}
-
-/// lowerIncomingArguments - To avoid having to handle incoming arguments
-/// specially, we lower each arg to a copy instruction in the entry block. This
-/// ensures that the argument value itself cannot be live out of the entry
-/// block.
-void SjLjEHPrepare::lowerIncomingArguments(Function &F) {
-  BasicBlock::iterator AfterAllocaInsPt = F.begin()->begin();
-  while (isa<AllocaInst>(AfterAllocaInsPt) &&
-         cast<AllocaInst>(AfterAllocaInsPt)->isStaticAlloca())
-    ++AfterAllocaInsPt;
-  assert(AfterAllocaInsPt != F.front().end());
-
-  for (auto &AI : F.args()) {
-    // Swift error really is a register that we model as memory -- instruction
-    // selection will perform mem-to-reg for us and spill/reload appropriately
-    // around calls that clobber it. There is no need to spill this
-    // value to the stack and doing so would not be allowed.
-    if (AI.isSwiftError())
-      continue;
-
-    Type *Ty = AI.getType();
-
-    // Use 'select i8 true, %arg, undef' to simulate a 'no-op' instruction.
-    Value *TrueValue = ConstantInt::getTrue(F.getContext());
-    Value *UndefValue = UndefValue::get(Ty);
-    Instruction *SI = SelectInst::Create(
-        TrueValue, &AI, UndefValue, AI.getName() + ".tmp", &*AfterAllocaInsPt);
-    AI.replaceAllUsesWith(SI);
-
-    // Reset the operand, because it  was clobbered by the RAUW above.
-    SI->setOperand(1, &AI);
-  }
-}
-
-/// lowerAcrossUnwindEdges - Find all variables which are alive across an unwind
-/// edge and spill them.
-void SjLjEHPrepare::lowerAcrossUnwindEdges(Function &F,
-                                           ArrayRef<InvokeInst *> Invokes) {
-  // Finally, scan the code looking for instructions with bad live ranges.
-  for (BasicBlock &BB : F) {
-    for (Instruction &Inst : BB) {
-      // Ignore obvious cases we don't have to handle. In particular, most
-      // instructions either have no uses or only have a single use inside the
-      // current block. Ignore them quickly.
-      if (Inst.use_empty())
-        continue;
-      if (Inst.hasOneUse() &&
-          cast<Instruction>(Inst.user_back())->getParent() == &BB &&
-          !isa<PHINode>(Inst.user_back()))
-        continue;
-
-      // If this is an alloca in the entry block, it's not a real register
-      // value.
-      if (auto *AI = dyn_cast<AllocaInst>(&Inst))
-        if (AI->isStaticAlloca())
-          continue;
-
-      // Avoid iterator invalidation by copying users to a temporary vector.
-      SmallVector<Instruction *, 16> Users;
-      for (User *U : Inst.users()) {
-        Instruction *UI = cast<Instruction>(U);
-        if (UI->getParent() != &BB || isa<PHINode>(UI))
-          Users.push_back(UI);
-      }
-
-      // Find all of the blocks that this value is live in.
-      SmallPtrSet<BasicBlock *, 32> LiveBBs;
-      LiveBBs.insert(&BB);
-      while (!Users.empty()) {
-        Instruction *U = Users.pop_back_val();
-
-        if (!isa<PHINode>(U)) {
-          MarkBlocksLiveIn(U->getParent(), LiveBBs);
-        } else {
-          // Uses for a PHI node occur in their predecessor block.
-          PHINode *PN = cast<PHINode>(U);
-          for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
-            if (PN->getIncomingValue(i) == &Inst)
-              MarkBlocksLiveIn(PN->getIncomingBlock(i), LiveBBs);
-        }
-      }
-
-      // Now that we know all of the blocks that this thing is live in, see if
-      // it includes any of the unwind locations.
-      bool NeedsSpill = false;
-      for (InvokeInst *Invoke : Invokes) {
-        BasicBlock *UnwindBlock = Invoke->getUnwindDest();
-        if (UnwindBlock != &BB && LiveBBs.count(UnwindBlock)) {
-          LLVM_DEBUG(dbgs() << "SJLJ Spill: " << Inst << " around "
-                            << UnwindBlock->getName() << "\n");
-          NeedsSpill = true;
-          break;
-        }
-      }
-
-      // If we decided we need a spill, do it.
-      // FIXME: Spilling this way is overkill, as it forces all uses of
-      // the value to be reloaded from the stack slot, even those that aren't
-      // in the unwind blocks. We should be more selective.
-      if (NeedsSpill) {
-        DemoteRegToStack(Inst, true);
-        ++NumSpilled;
-      }
-    }
-  }
-
-  // Go through the landing pads and remove any PHIs there.
-  for (InvokeInst *Invoke : Invokes) {
-    BasicBlock *UnwindBlock = Invoke->getUnwindDest();
-    LandingPadInst *LPI = UnwindBlock->getLandingPadInst();
-
-    // Place PHIs into a set to avoid invalidating the iterator.
-    SmallPtrSet<PHINode *, 8> PHIsToDemote;
-    for (BasicBlock::iterator PN = UnwindBlock->begin(); isa<PHINode>(PN); ++PN)
-      PHIsToDemote.insert(cast<PHINode>(PN));
-    if (PHIsToDemote.empty())
-      continue;
-
-    // Demote the PHIs to the stack.
-    for (PHINode *PN : PHIsToDemote)
-      DemotePHIToStack(PN);
-
-    // Move the landingpad instruction back to the top of the landing pad block.
-    LPI->moveBefore(&UnwindBlock->front());
-  }
-}
-
-/// setupEntryBlockAndCallSites - Setup the entry block by creating and filling
-/// the function context and marking the call sites with the appropriate
-/// values. These values are used by the DWARF EH emitter.
-bool SjLjEHPrepare::setupEntryBlockAndCallSites(Function &F) {
-  SmallVector<ReturnInst *, 16> Returns;
-  SmallVector<InvokeInst *, 16> Invokes;
-  SmallSetVector<LandingPadInst *, 16> LPads;
-
-  // Look through the terminators of the basic blocks to find invokes.
-  for (BasicBlock &BB : F)
-    if (auto *II = dyn_cast<InvokeInst>(BB.getTerminator())) {
-      if (Function *Callee = II->getCalledFunction())
-        if (Callee->getIntrinsicID() == Intrinsic::donothing) {
-          // Remove the NOP invoke.
-          BranchInst::Create(II->getNormalDest(), II);
-          II->eraseFromParent();
-          continue;
-        }
-
-      Invokes.push_back(II);
-      LPads.insert(II->getUnwindDest()->getLandingPadInst());
-    } else if (auto *RI = dyn_cast<ReturnInst>(BB.getTerminator())) {
-      Returns.push_back(RI);
-    }
-
-  if (Invokes.empty())
-    return false;
-
-  NumInvokes += Invokes.size();
-
-  lowerIncomingArguments(F);
-  lowerAcrossUnwindEdges(F, Invokes);
-
-  Value *FuncCtx =
-      setupFunctionContext(F, makeArrayRef(LPads.begin(), LPads.end()));
-  BasicBlock *EntryBB = &F.front();
-  IRBuilder<> Builder(EntryBB->getTerminator());
-
-  // Get a reference to the jump buffer.
-  Value *JBufPtr =
-      Builder.CreateConstGEP2_32(FunctionContextTy, FuncCtx, 0, 5, "jbuf_gep");
-
-  // Save the frame pointer.
-  Value *FramePtr = Builder.CreateConstGEP2_32(doubleUnderJBufTy, JBufPtr, 0, 0,
-                                               "jbuf_fp_gep");
-
-  Value *Val = Builder.CreateCall(FrameAddrFn, Builder.getInt32(0), "fp");
-  Builder.CreateStore(Val, FramePtr, /*isVolatile=*/true);
-
-  // Save the stack pointer.
-  Value *StackPtr = Builder.CreateConstGEP2_32(doubleUnderJBufTy, JBufPtr, 0, 2,
-                                               "jbuf_sp_gep");
-
-  Val = Builder.CreateCall(StackAddrFn, {}, "sp");
-  Builder.CreateStore(Val, StackPtr, /*isVolatile=*/true);
-
-  // Call the setup_dispatch instrinsic. It fills in the rest of the jmpbuf.
-  Builder.CreateCall(BuiltinSetupDispatchFn, {});
-
-  // Store a pointer to the function context so that the back-end will know
-  // where to look for it.
-  Value *FuncCtxArg = Builder.CreateBitCast(FuncCtx, Builder.getInt8PtrTy());
-  Builder.CreateCall(FuncCtxFn, FuncCtxArg);
-
-  // At this point, we are all set up, update the invoke instructions to mark
-  // their call_site values.
-  for (unsigned I = 0, E = Invokes.size(); I != E; ++I) {
-    insertCallSiteStore(Invokes[I], I + 1);
-
-    ConstantInt *CallSiteNum =
-        ConstantInt::get(Type::getInt32Ty(F.getContext()), I + 1);
-
-    // Record the call site value for the back end so it stays associated with
-    // the invoke.
-    CallInst::Create(CallSiteFn, CallSiteNum, "", Invokes[I]);
-  }
-
-  // Mark call instructions that aren't nounwind as no-action (call_site ==
-  // -1). Skip the entry block, as prior to then, no function context has been
-  // created for this function and any unexpected exceptions thrown will go
-  // directly to the caller's context, which is what we want anyway, so no need
-  // to do anything here.
-  for (BasicBlock &BB : F) {
-    if (&BB == &F.front())
-      continue;
-    for (Instruction &I : BB)
-      if (I.mayThrow())
-        insertCallSiteStore(&I, -1);
-  }
-
-  // Register the function context and make sure it's known to not throw
-  CallInst *Register =
-      CallInst::Create(RegisterFn, FuncCtx, "", EntryBB->getTerminator());
-  Register->setDoesNotThrow();
-
-  // Following any allocas not in the entry block, update the saved SP in the
-  // jmpbuf to the new value.
-  for (BasicBlock &BB : F) {
-    if (&BB == &F.front())
-      continue;
-    for (Instruction &I : BB) {
-      if (auto *CI = dyn_cast<CallInst>(&I)) {
-        if (CI->getCalledFunction() != StackRestoreFn)
-          continue;
-      } else if (!isa<AllocaInst>(&I)) {
-        continue;
-      }
-      Instruction *StackAddr = CallInst::Create(StackAddrFn, "sp");
-      StackAddr->insertAfter(&I);
-      Instruction *StoreStackAddr = new StoreInst(StackAddr, StackPtr, true);
-      StoreStackAddr->insertAfter(StackAddr);
-    }
-  }
-
-  // Finally, for any returns from this function, if this function contains an
-  // invoke, add a call to unregister the function context.
-  for (ReturnInst *Return : Returns)
-    CallInst::Create(UnregisterFn, FuncCtx, "", Return);
-
-  return true;
-}
-
-bool SjLjEHPrepare::runOnFunction(Function &F) {
-  Module &M = *F.getParent();
-  RegisterFn = M.getOrInsertFunction(
-      "_Unwind_SjLj_Register", Type::getVoidTy(M.getContext()),
-      PointerType::getUnqual(FunctionContextTy));
-  UnregisterFn = M.getOrInsertFunction(
-      "_Unwind_SjLj_Unregister", Type::getVoidTy(M.getContext()),
-      PointerType::getUnqual(FunctionContextTy));
-  FrameAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::frameaddress);
-  StackAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::stacksave);
-  StackRestoreFn = Intrinsic::getDeclaration(&M, Intrinsic::stackrestore);
-  BuiltinSetupDispatchFn =
-    Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_setup_dispatch);
-  LSDAAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_lsda);
-  CallSiteFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_callsite);
-  FuncCtxFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_functioncontext);
-
-  bool Res = setupEntryBlockAndCallSites(F);
-  return Res;
-}