mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-26 04:32:44 +01:00
e53c7321e4
This reverts commit r312526. Revert "Fix test/DebugInfo/dwarfdump-decompression-invalid-size.test" This reverts commit r312527. It causes an ASan failure: http://lab.llvm.org:8080/green/job/clang-stage2-cmake-RgSan_check/4150 llvm-svn: 312582
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
//===-- Decompressor.cpp --------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Object/Decompressor.h"
|
|
#include "llvm/BinaryFormat/ELF.h"
|
|
#include "llvm/Object/ELFObjectFile.h"
|
|
#include "llvm/Support/Compression.h"
|
|
#include "llvm/Support/DataExtractor.h"
|
|
#include "llvm/Support/Endian.h"
|
|
|
|
using namespace llvm;
|
|
using namespace llvm::support::endian;
|
|
using namespace object;
|
|
|
|
Expected<Decompressor> Decompressor::create(StringRef Name, StringRef Data,
|
|
bool IsLE, bool Is64Bit) {
|
|
if (!zlib::isAvailable())
|
|
return createError("zlib is not available");
|
|
|
|
Decompressor D(Data);
|
|
Error Err = isGnuStyle(Name) ? D.consumeCompressedGnuHeader()
|
|
: D.consumeCompressedZLibHeader(Is64Bit, IsLE);
|
|
if (Err)
|
|
return std::move(Err);
|
|
return D;
|
|
}
|
|
|
|
Decompressor::Decompressor(StringRef Data)
|
|
: SectionData(Data), DecompressedSize(0) {}
|
|
|
|
Error Decompressor::consumeCompressedGnuHeader() {
|
|
if (!SectionData.startswith("ZLIB"))
|
|
return createError("corrupted compressed section header");
|
|
|
|
SectionData = SectionData.substr(4);
|
|
|
|
// Consume uncompressed section size (big-endian 8 bytes).
|
|
if (SectionData.size() < 8)
|
|
return createError("corrupted uncompressed section size");
|
|
DecompressedSize = read64be(SectionData.data());
|
|
SectionData = SectionData.substr(8);
|
|
|
|
return Error::success();
|
|
}
|
|
|
|
Error Decompressor::consumeCompressedZLibHeader(bool Is64Bit,
|
|
bool IsLittleEndian) {
|
|
using namespace ELF;
|
|
uint64_t HdrSize = Is64Bit ? sizeof(Elf64_Chdr) : sizeof(Elf32_Chdr);
|
|
if (SectionData.size() < HdrSize)
|
|
return createError("corrupted compressed section header");
|
|
|
|
DataExtractor Extractor(SectionData, IsLittleEndian, 0);
|
|
uint32_t Offset = 0;
|
|
if (Extractor.getUnsigned(&Offset, Is64Bit ? sizeof(Elf64_Word)
|
|
: sizeof(Elf32_Word)) !=
|
|
ELFCOMPRESS_ZLIB)
|
|
return createError("unsupported compression type");
|
|
|
|
// Skip Elf64_Chdr::ch_reserved field.
|
|
if (Is64Bit)
|
|
Offset += sizeof(Elf64_Word);
|
|
|
|
DecompressedSize = Extractor.getUnsigned(
|
|
&Offset, Is64Bit ? sizeof(Elf64_Xword) : sizeof(Elf32_Word));
|
|
SectionData = SectionData.substr(HdrSize);
|
|
return Error::success();
|
|
}
|
|
|
|
bool Decompressor::isGnuStyle(StringRef Name) {
|
|
return Name.startswith(".zdebug");
|
|
}
|
|
|
|
bool Decompressor::isCompressed(const object::SectionRef &Section) {
|
|
StringRef Name;
|
|
if (Section.getName(Name))
|
|
return false;
|
|
return Section.isCompressed() || isGnuStyle(Name);
|
|
}
|
|
|
|
bool Decompressor::isCompressedELFSection(uint64_t Flags, StringRef Name) {
|
|
return (Flags & ELF::SHF_COMPRESSED) || isGnuStyle(Name);
|
|
}
|
|
|
|
Error Decompressor::decompress(MutableArrayRef<char> Buffer) {
|
|
size_t Size = Buffer.size();
|
|
return zlib::uncompress(SectionData, Buffer.data(), Size);
|
|
}
|