DwarfEHPrepare.cpp | Explore in Territory

//===- DwarfEHPrepare - Prepare exception handling for code generation ----===//
//
// 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 pass mulches exception handling code into a form adapted to code
// generation. Required if using dwarf exception handling.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/DwarfEHPrepare.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/DomTreeUpdater.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/RuntimeLibcallUtil.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/EHPersonalities.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/TargetParser/Triple.h"
#include "llvm/Transforms/Utils/Local.h"
#include <cstddef>

usingnamespacellvm;

#define DEBUG_TYPE …

STATISTIC(NumResumesLowered, "Number of resume calls lowered");
STATISTIC(NumCleanupLandingPadsUnreachable,
          "Number of cleanup landing pads found unreachable");
STATISTIC(NumCleanupLandingPadsRemaining,
          "Number of cleanup landing pads remaining");
STATISTIC(NumNoUnwind, "Number of functions with nounwind");
STATISTIC(NumUnwind, "Number of functions with unwind");

namespace {

class DwarfEHPrepare { … };

} // namespace

Value *DwarfEHPrepare::GetExceptionObject(ResumeInst *RI) { … }

size_t DwarfEHPrepare::pruneUnreachableResumes(
    SmallVectorImpl<ResumeInst *> &Resumes,
    SmallVectorImpl<LandingPadInst *> &CleanupLPads) { … }

bool DwarfEHPrepare::InsertUnwindResumeCalls() { … }

bool DwarfEHPrepare::run() { … }

static bool prepareDwarfEH(CodeGenOptLevel OptLevel, Function &F,
                           const TargetLowering &TLI, DominatorTree *DT,
                           const TargetTransformInfo *TTI,
                           const Triple &TargetTriple) { … }

namespace {

class DwarfEHPrepareLegacyPass : public FunctionPass { … };

} // end anonymous namespace

PreservedAnalyses DwarfEHPreparePass::run(Function &F,
                                          FunctionAnalysisManager &FAM) { … }

char DwarfEHPrepareLegacyPass::ID = …;

INITIALIZE_PASS_BEGIN(DwarfEHPrepareLegacyPass, DEBUG_TYPE,
                      "Prepare DWARF exceptions", false, false)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
INITIALIZE_PASS_END(DwarfEHPrepareLegacyPass, DEBUG_TYPE,
                    "Prepare DWARF exceptions", false, false)

FunctionPass *llvm::createDwarfEHPass(CodeGenOptLevel OptLevel) { … }
llvm/llvm/lib/CodeGen/DwarfEHPrepare.cpp
