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📄 ARMException.cpp(4.45 KB)
📄 AccelTable.cpp(24.07 KB)
📄 AddressPool.cpp(2.61 KB)
📄 AddressPool.h(1.93 KB)
📄 AsmPrinter.cpp(123.3 KB)
📄 AsmPrinterDwarf.cpp(9.88 KB)
📄 AsmPrinterInlineAsm.cpp(25.75 KB)
📄 ByteStreamer.h(3.93 KB)
📄 CodeViewDebug.cpp(115.03 KB)
📄 CodeViewDebug.h(17.9 KB)
📄 DIE.cpp(25.69 KB)
📄 DIEHash.cpp(14.17 KB)
📄 DIEHash.h(3.37 KB)
📄 DIEHashAttributes.def(2.02 KB)
📄 DbgEntityHistoryCalculator.cpp(14.88 KB)
📄 DebugHandlerBase.cpp(10.8 KB)
📄 DebugLocEntry.h(6.96 KB)
📄 DebugLocStream.cpp(1.36 KB)
📄 DebugLocStream.h(5.78 KB)
📄 DwarfCFIException.cpp(6.1 KB)
📄 DwarfCompileUnit.cpp(55.27 KB)
📄 DwarfCompileUnit.h(13.61 KB)
📄 DwarfDebug.cpp(128.56 KB)
📄 DwarfDebug.h(27.39 KB)
📄 DwarfException.h(3.23 KB)
📄 DwarfExpression.cpp(21.36 KB)
📄 DwarfExpression.h(15.03 KB)
📄 DwarfFile.cpp(4.31 KB)
📄 DwarfFile.h(5.86 KB)
📄 DwarfStringPool.cpp(4.72 KB)
📄 DwarfStringPool.h(2.07 KB)
📄 DwarfUnit.cpp(64.61 KB)
📄 DwarfUnit.h(14.34 KB)
📄 EHStreamer.cpp(25.33 KB)
📄 EHStreamer.h(5.66 KB)
📄 ErlangGCPrinter.cpp(4.16 KB)
📄 OcamlGCPrinter.cpp(6.38 KB)
📄 WasmException.cpp(4.09 KB)
📄 WasmException.h(1.32 KB)
📄 WinCFGuard.cpp(3.62 KB)
📄 WinCFGuard.h(1.77 KB)
📄 WinException.cpp(50.88 KB)
📄 WinException.h(4.1 KB)

Editing: DwarfCFIException.cpp

//===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===//
//
// 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 file contains support for writing DWARF exception info into asm files.
//
//===----------------------------------------------------------------------===//

#include "DwarfException.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;

DwarfCFIExceptionBase::DwarfCFIExceptionBase(AsmPrinter *A)
    : EHStreamer(A), shouldEmitCFI(false), hasEmittedCFISections(false) {}

void DwarfCFIExceptionBase::markFunctionEnd() {
  endFragment();

// Map all labels and get rid of any dead landing pads.
  if (!Asm->MF->getLandingPads().empty()) {
    MachineFunction *NonConstMF = const_cast<MachineFunction*>(Asm->MF);
    NonConstMF->tidyLandingPads();
  }
}

void DwarfCFIExceptionBase::endFragment() {
  if (shouldEmitCFI && !Asm->MF->hasBBSections())
    Asm->OutStreamer->emitCFIEndProc();
}

DwarfCFIException::DwarfCFIException(AsmPrinter *A)
    : DwarfCFIExceptionBase(A), shouldEmitPersonality(false),
      forceEmitPersonality(false), shouldEmitLSDA(false),
      shouldEmitMoves(false) {}

DwarfCFIException::~DwarfCFIException() {}

/// endModule - Emit all exception information that should come after the
/// content.
void DwarfCFIException::endModule() {
  // SjLj uses this pass and it doesn't need this info.
  if (!Asm->MAI->usesCFIForEH())
    return;

const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();

unsigned PerEncoding = TLOF.getPersonalityEncoding();

if ((PerEncoding & 0x80) != dwarf::DW_EH_PE_indirect)
    return;

// Emit references to all used personality functions
  for (const Function *Personality : MMI->getPersonalities()) {
    if (!Personality)
      continue;
    MCSymbol *Sym = Asm->getSymbol(Personality);
    TLOF.emitPersonalityValue(*Asm->OutStreamer, Asm->getDataLayout(), Sym);
  }
}

static MCSymbol *getExceptionSym(AsmPrinter *Asm) {
  return Asm->getCurExceptionSym();
}

void DwarfCFIException::beginFunction(const MachineFunction *MF) {
  shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
  const Function &F = MF->getFunction();

// If any landing pads survive, we need an EH table.
  bool hasLandingPads = !MF->getLandingPads().empty();

// See if we need frame move info.
  AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();

shouldEmitMoves = MoveType != AsmPrinter::CFI_M_None;

const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
  unsigned PerEncoding = TLOF.getPersonalityEncoding();
  const Function *Per = nullptr;
  if (F.hasPersonalityFn())
    Per = dyn_cast<Function>(F.getPersonalityFn()->stripPointerCasts());

// Emit a personality function even when there are no landing pads
  forceEmitPersonality =
      // ...if a personality function is explicitly specified
      F.hasPersonalityFn() &&
      // ... and it's not known to be a noop in the absence of invokes
      !isNoOpWithoutInvoke(classifyEHPersonality(Per)) &&
      // ... and we're not explicitly asked not to emit it
      F.needsUnwindTableEntry();

shouldEmitPersonality =
      (forceEmitPersonality ||
       (hasLandingPads && PerEncoding != dwarf::DW_EH_PE_omit)) &&
      Per;

unsigned LSDAEncoding = TLOF.getLSDAEncoding();
  shouldEmitLSDA = shouldEmitPersonality &&
    LSDAEncoding != dwarf::DW_EH_PE_omit;

shouldEmitCFI = MF->getMMI().getContext().getAsmInfo()->usesCFIForEH() &&
                  (shouldEmitPersonality || shouldEmitMoves);
  beginFragment(&*MF->begin(), getExceptionSym);
}

void DwarfCFIException::beginFragment(const MachineBasicBlock *MBB,
                                      ExceptionSymbolProvider ESP) {
  if (!shouldEmitCFI)
    return;

if (!hasEmittedCFISections) {
    if (Asm->needsOnlyDebugCFIMoves())
      Asm->OutStreamer->emitCFISections(false, true);
    else if (Asm->TM.Options.ForceDwarfFrameSection)
      Asm->OutStreamer->emitCFISections(true, true);
    hasEmittedCFISections = true;
  }

Asm->OutStreamer->emitCFIStartProc(/*IsSimple=*/false);

// Indicate personality routine, if any.
  if (!shouldEmitPersonality)
    return;

auto &F = MBB->getParent()->getFunction();
  auto *P = dyn_cast<Function>(F.getPersonalityFn()->stripPointerCasts());
  assert(P && "Expected personality function");

// If we are forced to emit this personality, make sure to record
  // it because it might not appear in any landingpad
  if (forceEmitPersonality)
    MMI->addPersonality(P);

const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
  unsigned PerEncoding = TLOF.getPersonalityEncoding();
  const MCSymbol *Sym = TLOF.getCFIPersonalitySymbol(P, Asm->TM, MMI);
  Asm->OutStreamer->emitCFIPersonality(Sym, PerEncoding);

// Provide LSDA information.
  if (shouldEmitLSDA)
    Asm->OutStreamer->emitCFILsda(ESP(Asm), TLOF.getLSDAEncoding());
}

/// endFunction - Gather and emit post-function exception information.
///
void DwarfCFIException::endFunction(const MachineFunction *MF) {
  if (!shouldEmitPersonality)
    return;

emitExceptionTable();
}

void DwarfCFIException::beginBasicBlock(const MachineBasicBlock &MBB) {
  beginFragment(&MBB, getExceptionSym);
}

void DwarfCFIException::endBasicBlock(const MachineBasicBlock &MBB) {
  if (shouldEmitCFI)
    Asm->OutStreamer->emitCFIEndProc();
}

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Editing: DwarfCFIException.cpp

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