25d7b4fb44
libtool uses file names to name members of an static library. Files, located in different directories and having matching name, would have the same name inside an archive. This is not a problem for ld, but may be a problem for ar. This patch renames files from ObjCopy library to avoid names clashing. See https://reviews.llvm.org/D88827#3335814 Differential Revision: https://reviews.llvm.org/D120345
98 lines
3.6 KiB
C++
98 lines
3.6 KiB
C++
//===- MachOLayoutBuilder.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 LLVM_LIB_OBJCOPY_MACHO_MACHOLAYOUTBUILDER_H
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#define LLVM_LIB_OBJCOPY_MACHO_MACHOLAYOUTBUILDER_H
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#include "MachOObject.h"
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#include "llvm/ObjCopy/MachO/MachOObjcopy.h"
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namespace llvm {
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namespace objcopy {
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namespace macho {
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/// When MachO binaries include a LC_CODE_SIGNATURE load command,
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/// the __LINKEDIT data segment will include a section corresponding
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/// to the LC_CODE_SIGNATURE load command. This section serves as a signature
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/// for the binary. Included in the CodeSignature section is a header followed
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/// by a hash of the binary. If present, the CodeSignature section is the
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/// last component of the binary.
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struct CodeSignatureInfo {
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// NOTE: These values are to be kept in sync with those in
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// LLD's CodeSignatureSection class.
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static constexpr uint32_t Align = 16;
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static constexpr uint8_t BlockSizeShift = 12;
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// The binary is read in blocks of the following size.
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static constexpr size_t BlockSize = (1 << BlockSizeShift); // 4 KiB
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// For each block, a SHA256 hash (256 bits, 32 bytes) is written to
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// the CodeSignature section.
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static constexpr size_t HashSize = 256 / 8;
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static constexpr size_t BlobHeadersSize = llvm::alignTo<8>(
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sizeof(llvm::MachO::CS_SuperBlob) + sizeof(llvm::MachO::CS_BlobIndex));
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// The size of the entire header depends upon the filename the binary is being
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// written to, but the rest of the header is fixed in size.
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static constexpr uint32_t FixedHeadersSize =
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BlobHeadersSize + sizeof(llvm::MachO::CS_CodeDirectory);
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// The offset relative to the start of the binary where
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// the CodeSignature section should begin.
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uint32_t StartOffset;
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// The size of the entire header, output file name size included.
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uint32_t AllHeadersSize;
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// The number of blocks required to hash the binary.
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uint32_t BlockCount;
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StringRef OutputFileName;
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// The size of the entire CodeSignature section, including both the header and
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// hashes.
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uint32_t Size;
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};
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class MachOLayoutBuilder {
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Object &O;
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bool Is64Bit;
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StringRef OutputFileName;
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uint64_t PageSize;
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CodeSignatureInfo CodeSignature;
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// Points to the __LINKEDIT segment if it exists.
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MachO::macho_load_command *LinkEditLoadCommand = nullptr;
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StringTableBuilder StrTableBuilder;
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uint32_t computeSizeOfCmds() const;
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void constructStringTable();
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void updateSymbolIndexes();
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void updateDySymTab(MachO::macho_load_command &MLC);
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uint64_t layoutSegments();
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uint64_t layoutRelocations(uint64_t Offset);
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Error layoutTail(uint64_t Offset);
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static StringTableBuilder::Kind getStringTableBuilderKind(const Object &O,
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bool Is64Bit);
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public:
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MachOLayoutBuilder(Object &O, bool Is64Bit, StringRef OutputFileName,
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uint64_t PageSize)
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: O(O), Is64Bit(Is64Bit), OutputFileName(OutputFileName),
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PageSize(PageSize),
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StrTableBuilder(getStringTableBuilderKind(O, Is64Bit)) {}
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// Recomputes and updates fields in the given object such as file offsets.
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Error layout();
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StringTableBuilder &getStringTableBuilder() { return StrTableBuilder; }
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const CodeSignatureInfo &getCodeSignature() { return CodeSignature; }
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};
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} // end namespace macho
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} // end namespace objcopy
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} // end namespace llvm
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#endif // LLVM_LIB_OBJCOPY_MACHO_MACHOLAYOUTBUILDER_H
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