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001ba65375
@thakis pointed out that `mach_header` and `mach_header_64` actually have the same set of (used) fields, with the 64-bit version having extra padding. So we can access the fields we need using the single `mach_header` type instead of using templates to switch between the two. I also spotted a potential issue where hasObjCSection tries to parse a file w/o checking if it does indeed match the target arch... As such, I've added a quick magic number check to ensure we don't access invalid memory during `findCommand()`. Addresses PR50180. Reviewed By: #lld-macho, thakis Differential Revision: https://reviews.llvm.org/D101724
55 lines
1.7 KiB
C++
55 lines
1.7 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 "llvm/BinaryFormat/MachO.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 hasObjCSection(MemoryBufferRef mb) {
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using Section = 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 =
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ArrayRef<Section>{reinterpret_cast<const Section *>(c + 1), c->nsects};
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for (const Section &sec : sectionHeaders) {
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StringRef sectname(sec.sectname,
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strnlen(sec.sectname, sizeof(sec.sectname)));
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StringRef segname(sec.segname, strnlen(sec.segname, sizeof(sec.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 == 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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bool macho::hasObjCSection(MemoryBufferRef mb) {
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if (target->wordSize == 8)
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return ::hasObjCSection<LP64>(mb);
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else
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return ::hasObjCSection<ILP32>(mb);
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}
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