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Remove zlibgnu support in llvm-mc 

The feature's been removed from most other tools in LLVM at this point.
This commit is contained in:
David Blaikie 2022-07-14 22:38:17 +00:00
parent 6ab7307177
commit d63ec445ca
3 changed files with 43 additions and 77 deletions
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17
llvm/lib/MC/ELFObjectWriter.cpp
View File

@ -146,7 +146,7 @@ struct ELFWriter {
bool maybeWriteCompression(uint64_t Size, bool maybeWriteCompression(uint64_t Size,
SmallVectorImpl<uint8_t> &CompressedContents, SmallVectorImpl<uint8_t> &CompressedContents,
bool ZLibStyle, unsigned Alignment); unsigned Alignment);
public: public:
ELFWriter(ELFObjectWriter &OWriter, raw_pwrite_stream &OS, ELFWriter(ELFObjectWriter &OWriter, raw_pwrite_stream &OS,
@ -819,9 +819,8 @@ MCSectionELF *ELFWriter::createRelocationSection(MCContext &Ctx,
// Include the debug info compression header. // Include the debug info compression header.
bool ELFWriter::maybeWriteCompression( bool ELFWriter::maybeWriteCompression(
uint64_t Size, SmallVectorImpl<uint8_t> &CompressedContents, bool ZLibStyle, uint64_t Size, SmallVectorImpl<uint8_t> &CompressedContents,
unsigned Alignment) { unsigned Alignment) {
if (ZLibStyle) {
uint64_t HdrSize = uint64_t HdrSize =
is64Bit() ? sizeof(ELF::Elf32_Chdr) : sizeof(ELF::Elf64_Chdr); is64Bit() ? sizeof(ELF::Elf32_Chdr) : sizeof(ELF::Elf64_Chdr);
if (Size <= HdrSize + CompressedContents.size()) if (Size <= HdrSize + CompressedContents.size())
@ -840,16 +839,6 @@ bool ELFWriter::maybeWriteCompression(
write(static_cast<ELF::Elf32_Word>(Alignment)); write(static_cast<ELF::Elf32_Word>(Alignment));
} }
return true; return true;
}
// "ZLIB" followed by 8 bytes representing the uncompressed size of the section,
// useful for consumers to preallocate a buffer to decompress into.
const StringRef Magic = "ZLIB";
if (Size <= Magic.size() + sizeof(Size) + CompressedContents.size())
return false;
W.OS << Magic;
support::endian::write(W.OS, Size, support::big);
return true;
} }
void ELFWriter::writeSectionData(const MCAssembler &Asm, MCSection &Sec, void ELFWriter::writeSectionData(const MCAssembler &Asm, MCSection &Sec,
@ -883,7 +872,7 @@ void ELFWriter::writeSectionData(const MCAssembler &Asm, MCSection &Sec,
bool ZlibStyle = MAI->compressDebugSections() == DebugCompressionType::Z; bool ZlibStyle = MAI->compressDebugSections() == DebugCompressionType::Z;
if (!maybeWriteCompression(UncompressedData.size(), CompressedContents, if (!maybeWriteCompression(UncompressedData.size(), CompressedContents,
ZlibStyle, Sec.getAlignment())) { Sec.getAlignment())) {
W.OS << UncompressedData; W.OS << UncompressedData;
return; return;
} }

67
llvm/test/MC/ELF/compression.s
View File

@ -1,69 +1,48 @@
// REQUIRES: zlib // REQUIRES: zlib
// Check zlib-gnu style
// RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib-gnu -triple x86_64-pc-linux-gnu < %s -o %t
// RUN: llvm-objdump -s %t | FileCheck --check-prefix=CHECK-GNU-STYLE %s
// RUN: llvm-dwarfdump -debug-str %t | FileCheck --check-prefix=STR %s
// RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib-gnu -triple i386-pc-linux-gnu --defsym I386=1 %s \
// RUN: | llvm-readelf -s - | FileCheck --check-prefix=386-SYMBOLS-GNU %s
// Check zlib style // Check zlib style
// RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib -triple x86_64-pc-linux-gnu < %s -o %t // RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib -triple x86_64-pc-linux-gnu < %s -o %t
// RUN: llvm-objdump -s %t | FileCheck --check-prefix=CHECK-ZLIB-STYLE %s // RUN: llvm-objdump -s %t | FileCheck %s
// RUN: llvm-dwarfdump -debug-str %t | FileCheck --check-prefix=STR %s // RUN: llvm-dwarfdump -debug-str %t | FileCheck --check-prefix=STR %s
// RUN: llvm-readelf --sections %t | FileCheck --check-prefixes=ZLIB-FLAGS,ZLIB-FLAGS64 %s // RUN: llvm-readelf --sections %t | FileCheck --check-prefixes=FLAGS,FLAGS64 %s
// RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib -triple i386-pc-linux-gnu --defsym I386=1 %s -o %t // RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib -triple i386-pc-linux-gnu --defsym I386=1 %s -o %t
// RUN: llvm-readelf -S -s %t | FileCheck --check-prefixes=386-SYMBOLS-ZLIB,ZLIB-FLAGS,ZLIB-FLAGS32 %s // RUN: llvm-readelf -S -s %t | FileCheck --check-prefixes=386-SYMBOLS,FLAGS,FLAGS32 %s
// Don't compress small sections, such as this simple debug_abbrev example
// CHECK-GNU-STYLE: Contents of section .debug_abbrev:
// CHECK-GNU-STYLE-NOT: ZLIB
// CHECK-GNU-STYLE-NOT: Contents of
// CHECK-GNU-STYLE: Contents of section .debug_info:
// CHECK-GNU-STYLE: Contents of section .zdebug_str:
// Check for the 'ZLIB' file magic at the start of the section only
// CHECK-GNU-STYLE-NEXT: ZLIB
// CHECK-GNU-STYLE-NOT: ZLIB
// CHECK-GNU-STYLE: Contents of section
// Decompress one valid dwarf section just to check that this roundtrips, // Decompress one valid dwarf section just to check that this roundtrips,
// we use .zdebug_str section for that // we use .debug_str section for that
// STR: perfectly compressable data sample ***************************************** // STR: perfectly compressable data sample *****************************************
// Now check the zlib style output: // Now check the zlib style output:
// Don't compress small sections, such as this simple debug_abbrev example // Don't compress small sections, such as this simple debug_abbrev example
// CHECK-ZLIB-STYLE: Contents of section .debug_abbrev: // CHECK: Contents of section .debug_abbrev:
// CHECK-ZLIB-STYLE-NOT: ZLIB // CHECK-NOT: ZLIB
// CHECK-ZLIB-STYLE-NOT: Contents of // CHECK-NOT: Contents of
// CHECK-ZLIB-STYLE: Contents of section .debug_info: // CHECK: Contents of section .debug_info:
// FIXME: Handle compressing alignment fragments to support compressing debug_frame // FIXME: Handle compressing alignment fragments to support compressing debug_frame
// CHECK-ZLIB-STYLE: Contents of section .debug_frame: // CHECK: Contents of section .debug_frame:
// CHECK-ZLIB-STYLE-NOT: ZLIB // CHECK-NOT: ZLIB
// CHECK-ZLIB-STYLE: Contents of // CHECK: Contents of
# ZLIB-FLAGS: .text PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 AX 0 0 4 # FLAGS: .text PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 AX 0 0 4
# ZLIB-FLAGS: .nonalloc PROGBITS [[#%x,]] [[#%x,]] 000226 00 0 0 1 # FLAGS: .nonalloc PROGBITS [[#%x,]] [[#%x,]] 000226 00 0 0 1
## Check that the large .debug_line and .debug_frame have the SHF_COMPRESSED ## Check that the large .debug_line and .debug_frame have the SHF_COMPRESSED
## flag. ## flag.
# ZLIB-FLAGS32: .debug_line PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 C 0 0 4 # FLAGS32: .debug_line PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 C 0 0 4
# ZLIB-FLAGS32: .debug_abbrev PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 0 0 1 # FLAGS32: .debug_abbrev PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 0 0 1
# ZLIB-FLAGS32: .debug_info PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 0 0 1 # FLAGS32: .debug_info PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 0 0 1
# ZLIB-FLAGS32: .debug_frame PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 C 0 0 4 # FLAGS32: .debug_frame PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 C 0 0 4
# ZLIB-FLAGS64: .debug_line PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 C 0 0 8 # FLAGS64: .debug_line PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 C 0 0 8
# ZLIB-FLAGS64: .debug_abbrev PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 0 0 1 # FLAGS64: .debug_abbrev PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 0 0 1
# ZLIB-FLAGS64: .debug_info PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 0 0 1 # FLAGS64: .debug_info PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 0 0 1
# ZLIB-FLAGS64: .debug_frame PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 C 0 0 8 # FLAGS64: .debug_frame PROGBITS [[#%x,]] [[#%x,]] [[#%x,]] 00 C 0 0 8
# 386-SYMBOLS-ZLIB: Symbol table '.symtab' # 386-SYMBOLS: Symbol table '.symtab'
# 386-SYMBOLS-ZLIB: .debug_str # 386-SYMBOLS: .debug_str
# 386-SYMBOLS-GNU: Symbol table '.symtab'
# 386-SYMBOLS-GNU: .zdebug_str
## Don't compress a section not named .debug_*. ## Don't compress a section not named .debug_*.
.section .nonalloc,"",@progbits .section .nonalloc,"",@progbits

4
llvm/tools/llvm-mc/llvm-mc.cpp
View File

@ -77,9 +77,7 @@ static cl::opt<DebugCompressionType> CompressDebugSections(
cl::desc("Choose DWARF debug sections compression:"), cl::desc("Choose DWARF debug sections compression:"),
cl::values(clEnumValN(DebugCompressionType::None, "none", "No compression"), cl::values(clEnumValN(DebugCompressionType::None, "none", "No compression"),
clEnumValN(DebugCompressionType::Z, "zlib", clEnumValN(DebugCompressionType::Z, "zlib",
"Use zlib compression"), "Use zlib compression")),
clEnumValN(DebugCompressionType::GNU, "zlib-gnu",
"Use zlib-gnu compression (deprecated)")),
cl::cat(MCCategory)); cl::cat(MCCategory));
static cl::opt<bool> static cl::opt<bool>