[Bug gdb/29563] New: gdb: support zstd for SHF_COMPRESSED debug sections

[Bug gdb/29563] New: gdb: support zstd for SHF_COMPRESSED debug sections

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

            Bug ID: 29563
           Summary: gdb: support zstd for SHF_COMPRESSED debug sections
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

Zstandard is a "universal" compression algorithm which scales from
low-ratio-very-fast to high-ratio-pretty-slow.
The generic-abi proposal https://groups.google.com/g/generic-abi/c/satyPkuMisk
("Add new ch_type value: ELFCOMPRESS_ZSTD") has been approved.

See https://sourceware.org/bugzilla/show_bug.cgi?id=29397 for binutils feature
request.

gdb will need to support SHF_COMPRESSED (ch_type=ELFCOMPRESS_ZSTD) .debug_*
sections in executables, shared objects, and (split DWARF) .dwo files.

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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
llvm-project has some components supporting zstd now. Some instructions for
developers who want to test gdb's support:


git clone https://github.com/facebook/zstd
cd zstd
cmake -GNinja -Hbuild/cmake -Bout/release -DCMAKE_BUILD_TYPE=Release
-DCMAKE_INSTALL_PREFIX=/tmp/opt/zstd
make -j 8 install

# See https://llvm.org/docs/GettingStarted.html
# Example: cmake -GNinja -Sllvm -Bout/release -DCMAKE_BUILD_TYPE=Release
-DLLVM_ENABLE_PROJECTS='clang;lld' -DLLVM_ENABLE_ZSTD=FORCE_ON
-DCMAKE_PREFIX_PATH=/tmp/opt/zstd; ninja -C out/release llvm-objcopy clang lld

You can create zstd output with

out/release/bin/llvm-objcopy --compress-debug-sections=zstd a.out a.out.zstd

or out/release/bin/clang -fuse-ld=lld -gz=zstd a.o b.o ...

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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[dblaikie at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

David Blaikie <dblaikie at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dblaikie at gmail dot com

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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sam at gentoo dot org

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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[guillaume at morinfr dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

Guillaume Morin <guillaume at morinfr dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |guillaume at morinfr dot org

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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ssbssa at sourceware dot org

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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

--- Comment #2 from Fangrui Song <i at maskray dot me> ---
Due to gdb's use of bfd/compress.c, this actually has to be supported in the
same patch that adds zstd support to bfd/.  Here it is.

https://sourceware.org/pipermail/gdb-patches/2022-September/191915.html [PATCH]
binutils, gdb: support zstd compressed debug sections

I have tested gdb with a zstd-compressed lld.

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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

Fangrui Song <i at maskray dot me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |29584


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=29584
[Bug 29584] gdb: support zstd compressed .gnu_debugdata
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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

Fangrui Song <i at maskray dot me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #3 from Fangrui Song <i at maskray dot me> ---
Closed by
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=2cac01e3ffff74898c54fa5e6418817f5578adb6
"binutils, gdb: support zstd compressed debug sections"

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[Bug gdb/29563] gdb: support zstd for SHF_COMPRESSED debug sections

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29563

Fangrui Song <i at maskray dot me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |13.1

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