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e3e43d9d57
I did this a long time ago with a janky python script, but now clang-format has built-in support for this. I fed clang-format every line with a #include and let it re-sort things according to the precise LLVM rules for include ordering baked into clang-format these days. I've reverted a number of files where the results of sorting includes isn't healthy. Either places where we have legacy code relying on particular include ordering (where possible, I'll fix these separately) or where we have particular formatting around #include lines that I didn't want to disturb in this patch. This patch is *entirely* mechanical. If you get merge conflicts or anything, just ignore the changes in this patch and run clang-format over your #include lines in the files. Sorry for any noise here, but it is important to keep these things stable. I was seeing an increasing number of patches with irrelevant re-ordering of #include lines because clang-format was used. This patch at least isolates that churn, makes it easy to skip when resolving conflicts, and gets us to a clean baseline (again). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304787 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
//===-- Decompressor.cpp --------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/Decompressor.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Support/Compression.h"
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#include "llvm/Support/DataExtractor.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm;
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using namespace llvm::support::endian;
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using namespace object;
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Expected<Decompressor> Decompressor::create(StringRef Name, StringRef Data,
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bool IsLE, bool Is64Bit) {
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if (!zlib::isAvailable())
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return createError("zlib is not available");
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Decompressor D(Data);
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Error Err = isGnuStyle(Name) ? D.consumeCompressedGnuHeader()
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: D.consumeCompressedZLibHeader(Is64Bit, IsLE);
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if (Err)
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return std::move(Err);
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return D;
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}
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Decompressor::Decompressor(StringRef Data)
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: SectionData(Data), DecompressedSize(0) {}
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Error Decompressor::consumeCompressedGnuHeader() {
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if (!SectionData.startswith("ZLIB"))
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return createError("corrupted compressed section header");
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SectionData = SectionData.substr(4);
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// Consume uncompressed section size (big-endian 8 bytes).
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if (SectionData.size() < 8)
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return createError("corrupted uncompressed section size");
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DecompressedSize = read64be(SectionData.data());
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SectionData = SectionData.substr(8);
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return Error::success();
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}
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Error Decompressor::consumeCompressedZLibHeader(bool Is64Bit,
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bool IsLittleEndian) {
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using namespace ELF;
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uint64_t HdrSize = Is64Bit ? sizeof(Elf64_Chdr) : sizeof(Elf32_Chdr);
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if (SectionData.size() < HdrSize)
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return createError("corrupted compressed section header");
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DataExtractor Extractor(SectionData, IsLittleEndian, 0);
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uint32_t Offset = 0;
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if (Extractor.getUnsigned(&Offset, Is64Bit ? sizeof(Elf64_Word)
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: sizeof(Elf32_Word)) !=
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ELFCOMPRESS_ZLIB)
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return createError("unsupported compression type");
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// Skip Elf64_Chdr::ch_reserved field.
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if (Is64Bit)
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Offset += sizeof(Elf64_Word);
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DecompressedSize = Extractor.getUnsigned(
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&Offset, Is64Bit ? sizeof(Elf64_Xword) : sizeof(Elf32_Word));
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SectionData = SectionData.substr(HdrSize);
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return Error::success();
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}
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bool Decompressor::isGnuStyle(StringRef Name) {
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return Name.startswith(".zdebug");
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}
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bool Decompressor::isCompressed(const object::SectionRef &Section) {
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StringRef Name;
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if (Section.getName(Name))
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return false;
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return Section.isCompressed() || isGnuStyle(Name);
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}
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bool Decompressor::isCompressedELFSection(uint64_t Flags, StringRef Name) {
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return (Flags & ELF::SHF_COMPRESSED) || isGnuStyle(Name);
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}
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Error Decompressor::decompress(MutableArrayRef<char> Buffer) {
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size_t Size = Buffer.size();
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return zlib::uncompress(SectionData, Buffer.data(), Size);
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}
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