lld/MachO/Dwarf.cpp

   1 //===- DWARF.cpp ----------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "Dwarf.h"
  10 #include "InputFiles.h"
  11 #include "InputSection.h"
  12 #include "OutputSegment.h"
  13
  14 #include <memory>
  15
  16 using namespace lld;
  17 using namespace lld::macho;
  18 using namespace llvm;
  19
  20 std::unique_ptr<DwarfObject> DwarfObject::create(ObjFile *obj) {
  21   auto dObj = std::make_unique<DwarfObject>();
  22   bool hasDwarfInfo = false;
  23   // LLD only needs to extract the source file path and line numbers from the
  24   // debug info, so we initialize DwarfObject with just the sections necessary
  25   // to get that path. The debugger will locate the debug info via the object
  26   // file paths that we emit in our STABS symbols, so we don't need to process &
  27   // emit them ourselves.
  28   for (const InputSection *isec : obj->debugSections) {
  29     if (StringRef *s =
  30             StringSwitch<StringRef *>(isec->getName())
  31                 .Case(section_names::debugInfo, &dObj->infoSection.Data)
  32                 .Case(section_names::debugLine, &dObj->lineSection.Data)
  33                 .Case(section_names::debugStrOffs, &dObj->strOffsSection.Data)
  34                 .Case(section_names::debugAbbrev, &dObj->abbrevSection)
  35                 .Case(section_names::debugStr, &dObj->strSection)
  36                 .Default(nullptr)) {
  37       *s = toStringRef(isec->data);
  38       hasDwarfInfo = true;
  39     }
  40   }
  41
  42   if (hasDwarfInfo)
  43     return dObj;
  44   return nullptr;
  45 }