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comparison lld/MachO/ObjC.cpp @ 207:2e18cbf3894f

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LLVM12
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Tue, 08 Jun 2021 06:07:14 +0900
parents
children c4bab56944e8
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173:0572611fdcc8 207:2e18cbf3894f
1 //===- ObjC.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 "ObjC.h"
10 #include "InputFiles.h"
11 #include "InputSection.h"
12 #include "OutputSegment.h"
13 #include "Target.h"
14
15 #include "llvm/BinaryFormat/MachO.h"
16
17 using namespace llvm;
18 using namespace llvm::MachO;
19 using namespace lld;
20 using namespace lld::macho;
21
22 template <class LP> static bool hasObjCSection(MemoryBufferRef mb) {
23 using Section = typename LP::section;
24
25 auto *hdr =
26 reinterpret_cast<const typename LP::mach_header *>(mb.getBufferStart());
27 if (hdr->magic != LP::magic)
28 return false;
29
30 if (const auto *c =
31 findCommand<typename LP::segment_command>(hdr, LP::segmentLCType)) {
32 auto sectionHeaders =
33 ArrayRef<Section>{reinterpret_cast<const Section *>(c + 1), c->nsects};
34 for (const Section &sec : sectionHeaders) {
35 StringRef sectname(sec.sectname,
36 strnlen(sec.sectname, sizeof(sec.sectname)));
37 StringRef segname(sec.segname, strnlen(sec.segname, sizeof(sec.segname)));
38 if ((segname == segment_names::data &&
39 sectname == section_names::objcCatList) ||
40 (segname == segment_names::text &&
41 sectname == section_names::swift)) {
42 return true;
43 }
44 }
45 }
46 return false;
47 }
48
49 bool macho::hasObjCSection(MemoryBufferRef mb) {
50 if (target->wordSize == 8)
51 return ::hasObjCSection<LP64>(mb);
52 else
53 return ::hasObjCSection<ILP32>(mb);
54 }