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
16using namespace lld;
17using namespace lld::macho;
18using namespace llvm;
19
20std::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}
46