ecad968f4a
This reverts commit ef122753db.
Apparently it is causing some crashes:
https://reviews.llvm.org/D142916#4178869
69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
//===- ObjC.cpp -----------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "ObjC.h"
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#include "InputFiles.h"
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#include "InputSection.h"
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#include "OutputSegment.h"
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#include "Target.h"
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#include "lld/Common/ErrorHandler.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/Bitcode/BitcodeReader.h"
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using namespace llvm;
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using namespace llvm::MachO;
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using namespace lld;
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using namespace lld::macho;
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template <class LP> static bool objectHasObjCSection(MemoryBufferRef mb) {
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using SectionHeader = typename LP::section;
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auto *hdr =
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reinterpret_cast<const typename LP::mach_header *>(mb.getBufferStart());
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if (hdr->magic != LP::magic)
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return false;
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if (const auto *c =
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findCommand<typename LP::segment_command>(hdr, LP::segmentLCType)) {
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auto sectionHeaders = ArrayRef<SectionHeader>{
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reinterpret_cast<const SectionHeader *>(c + 1), c->nsects};
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for (const SectionHeader &secHead : sectionHeaders) {
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StringRef sectname(secHead.sectname,
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strnlen(secHead.sectname, sizeof(secHead.sectname)));
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StringRef segname(secHead.segname,
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strnlen(secHead.segname, sizeof(secHead.segname)));
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if ((segname == segment_names::data &&
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sectname == section_names::objcCatList) ||
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(segname == segment_names::text &&
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sectname.startswith(section_names::swift))) {
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return true;
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}
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}
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}
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return false;
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}
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static bool objectHasObjCSection(MemoryBufferRef mb) {
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if (target->wordSize == 8)
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return ::objectHasObjCSection<LP64>(mb);
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else
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return ::objectHasObjCSection<ILP32>(mb);
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}
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bool macho::hasObjCSection(MemoryBufferRef mb) {
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switch (identify_magic(mb.getBuffer())) {
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case file_magic::macho_object:
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return objectHasObjCSection(mb);
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case file_magic::bitcode:
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return check(isBitcodeContainingObjCCategory(mb));
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default:
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return false;
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}
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}
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