742a82a729
The MachO format supports relative offsets for ObjC method lists. This support is present already in ld64. With this change we implement this support in lld also. Relative method lists can be identified by a specific flag (0x80000000) in the method list header. When this flag is present, the method list will contain 32-bit relative offsets to the current Program Counter (PC), instead of absolute pointers. Additionally, when relative method lists are used, the offset to the selector name will now be relative and point to the selector reference (selref) instead of the name itself.
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
//===- ObjC.h ---------------------------------------------------*- C++ -*-===//
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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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#ifndef LLD_MACHO_OBJC_H
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#define LLD_MACHO_OBJC_H
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#include "llvm/Support/MemoryBuffer.h"
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namespace lld::macho {
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namespace objc {
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namespace symbol_names {
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constexpr const char klass[] = "_OBJC_CLASS_$_";
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constexpr const char klassPropList[] = "__OBJC_$_CLASS_PROP_LIST_";
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constexpr const char metaclass[] = "_OBJC_METACLASS_$_";
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constexpr const char ehtype[] = "_OBJC_EHTYPE_$_";
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constexpr const char ivar[] = "_OBJC_IVAR_$_";
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constexpr const char instanceMethods[] = "__OBJC_$_INSTANCE_METHODS_";
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constexpr const char classMethods[] = "__OBJC_$_CLASS_METHODS_";
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constexpr const char listProprieties[] = "__OBJC_$_PROP_LIST_";
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constexpr const char category[] = "__OBJC_$_CATEGORY_";
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constexpr const char categoryInstanceMethods[] =
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"__OBJC_$_CATEGORY_INSTANCE_METHODS_";
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constexpr const char categoryClassMethods[] =
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"__OBJC_$_CATEGORY_CLASS_METHODS_";
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constexpr const char categoryProtocols[] = "__OBJC_CATEGORY_PROTOCOLS_$_";
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} // namespace symbol_names
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// Check for duplicate method names within related categories / classes.
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void checkCategories();
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void mergeCategories();
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void doCleanup();
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} // namespace objc
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bool hasObjCSection(llvm::MemoryBufferRef);
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} // namespace lld::macho
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#endif
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