Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/lib/Transforms/Utils/EscapeEnumerator.cpp

@@ -1,95 +0,0 @@
-//===- EscapeEnumerator.cpp -----------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// Defines a helper class that enumerates all possible exits from a function,
-// including exception handling.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/Utils/EscapeEnumerator.h"
-#include "llvm/Analysis/EHPersonalities.h"
-#include "llvm/IR/CallSite.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Transforms/Utils/Local.h"
-using namespace llvm;
-
-static Constant *getDefaultPersonalityFn(Module *M) {
-  LLVMContext &C = M->getContext();
-  Triple T(M->getTargetTriple());
-  EHPersonality Pers = getDefaultEHPersonality(T);
-  return M->getOrInsertFunction(getEHPersonalityName(Pers),
-                                FunctionType::get(Type::getInt32Ty(C), true));
-}
-
-IRBuilder<> *EscapeEnumerator::Next() {
-  if (Done)
-    return nullptr;
-
-  // Find all 'return', 'resume', and 'unwind' instructions.
-  while (StateBB != StateE) {
-    BasicBlock *CurBB = &*StateBB++;
-
-    // Branches and invokes do not escape, only unwind, resume, and return
-    // do.
-    TerminatorInst *TI = CurBB->getTerminator();
-    if (!isa<ReturnInst>(TI) && !isa<ResumeInst>(TI))
-      continue;
-
-    Builder.SetInsertPoint(TI);
-    return &Builder;
-  }
-
-  Done = true;
-
-  if (!HandleExceptions)
-    return nullptr;
-
-  if (F.doesNotThrow())
-    return nullptr;
-
-  // Find all 'call' instructions that may throw.
-  SmallVector<Instruction *, 16> Calls;
-  for (BasicBlock &BB : F)
-    for (Instruction &II : BB)
-      if (CallInst *CI = dyn_cast<CallInst>(&II))
-        if (!CI->doesNotThrow())
-          Calls.push_back(CI);
-
-  if (Calls.empty())
-    return nullptr;
-
-  // Create a cleanup block.
-  LLVMContext &C = F.getContext();
-  BasicBlock *CleanupBB = BasicBlock::Create(C, CleanupBBName, &F);
-  Type *ExnTy = StructType::get(Type::getInt8PtrTy(C), Type::getInt32Ty(C));
-  if (!F.hasPersonalityFn()) {
-    Constant *PersFn = getDefaultPersonalityFn(F.getParent());
-    F.setPersonalityFn(PersFn);
-  }
-
-  if (isFuncletEHPersonality(classifyEHPersonality(F.getPersonalityFn()))) {
-    report_fatal_error("Funclet EH not supported");
-  }
-
-  LandingPadInst *LPad =
-      LandingPadInst::Create(ExnTy, 1, "cleanup.lpad", CleanupBB);
-  LPad->setCleanup(true);
-  ResumeInst *RI = ResumeInst::Create(LPad, CleanupBB);
-
-  // Transform the 'call' instructions into 'invoke's branching to the
-  // cleanup block. Go in reverse order to make prettier BB names.
-  SmallVector<Value *, 16> Args;
-  for (unsigned I = Calls.size(); I != 0;) {
-    CallInst *CI = cast<CallInst>(Calls[--I]);
-    changeToInvokeAndSplitBasicBlock(CI, CleanupBB);
-  }
-
-  Builder.SetInsertPoint(RI);
-  return &Builder;
-}