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1 //===- ObjC.cpp -----------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "ObjC.h"
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10 #include "InputFiles.h"
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11 #include "InputSection.h"
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12 #include "OutputSegment.h"
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13 #include "Target.h"
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14
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15 #include "llvm/BinaryFormat/MachO.h"
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16
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17 using namespace llvm;
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18 using namespace llvm::MachO;
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19 using namespace lld;
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20 using namespace lld::macho;
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21
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22 template <class LP> static bool hasObjCSection(MemoryBufferRef mb) {
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23 using Section = typename LP::section;
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24
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25 auto *hdr =
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26 reinterpret_cast<const typename LP::mach_header *>(mb.getBufferStart());
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27 if (hdr->magic != LP::magic)
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28 return false;
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29
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30 if (const auto *c =
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31 findCommand<typename LP::segment_command>(hdr, LP::segmentLCType)) {
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32 auto sectionHeaders =
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33 ArrayRef<Section>{reinterpret_cast<const Section *>(c + 1), c->nsects};
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34 for (const Section &sec : sectionHeaders) {
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35 StringRef sectname(sec.sectname,
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36 strnlen(sec.sectname, sizeof(sec.sectname)));
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37 StringRef segname(sec.segname, strnlen(sec.segname, sizeof(sec.segname)));
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38 if ((segname == segment_names::data &&
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39 sectname == section_names::objcCatList) ||
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40 (segname == segment_names::text &&
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41 sectname == section_names::swift)) {
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42 return true;
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43 }
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44 }
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45 }
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46 return false;
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47 }
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48
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49 bool macho::hasObjCSection(MemoryBufferRef mb) {
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50 if (target->wordSize == 8)
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51 return ::hasObjCSection<LP64>(mb);
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52 else
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53 return ::hasObjCSection<ILP32>(mb);
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54 }
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