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 
create(ObjFile * obj)20 std::unique_ptr<DwarfObject> DwarfObject::create(ObjFile *obj) {
21   auto dObj = std::make_unique<DwarfObject>();
22   bool hasDwarfInfo = false;
23   for (SubsectionMap subsecMap : obj->subsections) {
24     for (auto it : subsecMap) {
25       InputSection *isec = it.second;
26       if (!(isDebugSection(isec->flags) &&
27             isec->segname == segment_names::dwarf))
28         continue;
29 
30       if (isec->name == "__debug_info") {
31         dObj->infoSection.Data = toStringRef(isec->data);
32         hasDwarfInfo = true;
33         continue;
34       }
35 
36       if (StringRef *s = StringSwitch<StringRef *>(isec->name)
37                              .Case("__debug_abbrev", &dObj->abbrevSection)
38                              .Case("__debug_str", &dObj->strSection)
39                              .Default(nullptr)) {
40         *s = toStringRef(isec->data);
41         hasDwarfInfo = true;
42       }
43     }
44   }
45 
46   if (hasDwarfInfo)
47     return dObj;
48   return nullptr;
49 }
50