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📄 AMDGPUEmitPrintf.cpp(8.57 KB)
📄 ASanStackFrameLayout.cpp(5.75 KB)
📄 AddDiscriminators.cpp(10.78 KB)
📄 AssumeBundleBuilder.cpp(21.46 KB)
📄 BasicBlockUtils.cpp(51.81 KB)
📄 BreakCriticalEdges.cpp(19.03 KB)
📄 BuildLibCalls.cpp(43.9 KB)
📄 BypassSlowDivision.cpp(17.95 KB)
📄 CallGraphUpdater.cpp(5.76 KB)
📄 CallPromotionUtils.cpp(22.18 KB)
📄 CanonicalizeAliases.cpp(3.18 KB)
📄 CanonicalizeFreezeInLoops.cpp(7.93 KB)
📄 CloneFunction.cpp(34.49 KB)
📄 CloneModule.cpp(7.93 KB)
📄 CodeExtractor.cpp(65.69 KB)
📄 CodeMoverUtils.cpp(15.82 KB)
📄 CtorUtils.cpp(5.1 KB)
📄 Debugify.cpp(17.78 KB)
📄 DemoteRegToStack.cpp(6.1 KB)
📄 EntryExitInstrumenter.cpp(5.83 KB)
📄 EscapeEnumerator.cpp(2.96 KB)
📄 Evaluator.cpp(27.98 KB)
📄 FixIrreducible.cpp(12.68 KB)
📄 FlattenCFG.cpp(16.99 KB)
📄 FunctionComparator.cpp(34.36 KB)
📄 FunctionImportUtils.cpp(13.8 KB)
📄 GlobalStatus.cpp(7.23 KB)
📄 GuardUtils.cpp(4.76 KB)
📄 ImportedFunctionsInliningStatistics.cpp(7.67 KB)
📄 InjectTLIMappings.cpp(6.62 KB)
📄 InlineFunction.cpp(103.28 KB)
📄 InstructionNamer.cpp(1.98 KB)
📄 IntegerDivision.cpp(26.17 KB)
📄 LCSSA.cpp(18.72 KB)
📄 LibCallsShrinkWrap.cpp(18.68 KB)
📄 Local.cpp(114.96 KB)
📄 LoopRotationUtils.cpp(29.47 KB)
📄 LoopSimplify.cpp(36.13 KB)
📄 LoopUnroll.cpp(38.07 KB)
📄 LoopUnrollAndJam.cpp(37.71 KB)
📄 LoopUnrollPeel.cpp(31.88 KB)
📄 LoopUnrollRuntime.cpp(40.17 KB)
📄 LoopUtils.cpp(65.03 KB)
📄 LoopVersioning.cpp(12.42 KB)
📄 LowerInvoke.cpp(3.3 KB)
📄 LowerMemIntrinsics.cpp(20.41 KB)
📄 LowerSwitch.cpp(23.46 KB)
📄 Mem2Reg.cpp(3.71 KB)
📄 MetaRenamer.cpp(5.29 KB)
📄 MisExpect.cpp(6.97 KB)
📄 ModuleUtils.cpp(10.99 KB)
📄 NameAnonGlobals.cpp(3.33 KB)
📄 PredicateInfo.cpp(36.79 KB)
📄 PromoteMemoryToRegister.cpp(37.26 KB)
📄 SSAUpdater.cpp(16.72 KB)
📄 SSAUpdaterBulk.cpp(7.46 KB)
📄 SanitizerStats.cpp(4.08 KB)
📄 ScalarEvolutionExpander.cpp(101.25 KB)
📄 SimplifyCFG.cpp(238.13 KB)
📄 SimplifyIndVar.cpp(34.53 KB)
📄 SimplifyLibCalls.cpp(122.25 KB)
📄 SizeOpts.cpp(5.08 KB)
📄 SplitModule.cpp(9.67 KB)
📄 StripGCRelocates.cpp(2.86 KB)
📄 StripNonLineTableDebugInfo.cpp(1.4 KB)
📄 SymbolRewriter.cpp(18.82 KB)
📄 UnifyFunctionExitNodes.cpp(4.42 KB)
📄 UnifyLoopExits.cpp(8.16 KB)
📄 UniqueInternalLinkageNames.cpp(2.91 KB)
📄 Utils.cpp(2.53 KB)
📄 VNCoercion.cpp(25.89 KB)
📄 ValueMapper.cpp(38.06 KB)

Editing: EscapeEnumerator.cpp

//===- EscapeEnumerator.cpp -----------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Defines a helper class that enumerates all possible exits from a function,
// including exception handling.
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Utils/EscapeEnumerator.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/EHPersonalities.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/Utils/Local.h"

using namespace llvm;

static FunctionCallee 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.
    Instruction *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()) {
    FunctionCallee PersFn = getDefaultPersonalityFn(F.getParent());
    F.setPersonalityFn(cast<Constant>(PersFn.getCallee()));
  }

if (isScopedEHPersonality(classifyEHPersonality(F.getPersonalityFn()))) {
    report_fatal_error("Scoped 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;
}

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Editing: EscapeEnumerator.cpp

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