Revert r341342: Dwarf .debug section compression support (zlib, zlib-gnu).

Also reverts follow-up commits r341343 and r341344.

The primary commit continues to break some build bots even after the
fixes in r341343 for UBSan issues:
http://lab.llvm.org:8011/builders/clang-cmake-aarch64-full/builds/5823

It is also failing for me locally (linux, x86-64).

llvm-svn: 341360

1 files changed, 0 insertions, 61 deletions

diff --git a/llvm/tools/llvm-objcopy/Object.cpp b/llvm/tools/llvm-objcopy/Object.cpp
index 3893c0e2c53..12fd80228bf 100644
--- a/llvm/tools/llvm-objcopy/Object.cpp
+++ b/llvm/tools/llvm-objcopy/Object.cpp
@@ -15,9 +15,7 @@
 #include "llvm/ADT/Twine.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/BinaryFormat/ELF.h"
-#include "llvm/MC/MCTargetOptions.h"
 #include "llvm/Object/ELFObjectFile.h"
-#include "llvm/Support/Compression.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileOutputBuffer.h"
 #include "llvm/Support/Path.h"
@@ -140,65 +138,6 @@ void OwnedDataSection::accept(SectionVisitor &Visitor) const {
   Visitor.visit(*this);
 }
 
-void BinarySectionWriter::visit(const CompressedSection &Sec) {
-  error("Cannot write compressed section '" + Sec.Name + "' ");
-}
-
-template <class ELFT>
-void ELFSectionWriter<ELFT>::visit(const CompressedSection &Sec) {
-  uint8_t *Buf = Out.getBufferStart();
-  Buf += Sec.Offset;
-
-  if (Sec.CompressionType == DebugCompressionType::GNU) {
-    ArrayRef<uint8_t> Magic = {'Z', 'L', 'I', 'B'};
-    std::copy(Magic.begin(), Magic.end(), Buf);
-    Buf += Magic.size();
-    const uint64_t DecompressedSize =
-        support::endian::read64be(&Sec.DecompressedSize);
-    memcpy(Buf, &DecompressedSize, sizeof(DecompressedSize));
-    Buf += sizeof(DecompressedSize);
-  } else {
-    auto Chdr = reinterpret_cast<Elf_Chdr_Impl<ELFT> *>(Buf);
-    Chdr->ch_type = ELF::ELFCOMPRESS_ZLIB;
-    Chdr->ch_size = Sec.DecompressedSize;
-    Chdr->ch_addralign = Sec.DecompressedAlign;
-    Buf += sizeof(*Chdr);
-  }
-
-  std::copy(Sec.CompressedData.begin(), Sec.CompressedData.end(), Buf);
-}
-
-CompressedSection::CompressedSection(const SectionBase &Sec,
-                                     DebugCompressionType CompressionType)
-    : SectionBase(Sec), CompressionType(CompressionType),
-      DecompressedSize(Sec.OriginalData.size()), DecompressedAlign(Sec.Align) {
-
-  if (Error E = zlib::compress(
-          StringRef(reinterpret_cast<const char *>(OriginalData.data()),
-                    OriginalData.size()),
-          CompressedData))
-    reportError(Name, std::move(E));
-
-  size_t ChdrSize;
-  if (CompressionType == DebugCompressionType::GNU) {
-    Name = ".z" + Sec.Name.substr(1);
-    ChdrSize = sizeof("ZLIB") - 1 + sizeof(uint64_t);
-  } else {
-    Flags |= ELF::SHF_COMPRESSED;
-    ChdrSize =
-        std::max(std::max(sizeof(object::Elf_Chdr_Impl<object::ELF64LE>),
-                          sizeof(object::Elf_Chdr_Impl<object::ELF64BE>)),
-                 std::max(sizeof(object::Elf_Chdr_Impl<object::ELF32LE>),
-                          sizeof(object::Elf_Chdr_Impl<object::ELF32BE>)));
-  }
-  Size = ChdrSize + CompressedData.size();
-  Align = 8;
-}
-
-void CompressedSection::accept(SectionVisitor &Visitor) const {
-  Visitor.visit(*this);
-}
-
 void StringTableSection::addString(StringRef Name) {
   StrTabBuilder.add(Name);
   Size = StrTabBuilder.getSize();