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Add --offoading option to llvm-readobj #143342

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Merged
merged 9 commits into from
Sep 29, 2025
Merged

Add --offoading option to llvm-readobj #143342

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82d085c
Add --offoading option to llvm-readobj
david-salinas Aug 28, 2024
e1d45de
PR comments addressed
Jul 15, 2025
a0929b5
Resolve PR comments.
Aug 19, 2025
674daab
Resolve PR comments.
david-salinas Aug 29, 2025
94911f8
Change error message to warning on invalid offload bundle
david-salinas Sep 2, 2025
69908e3
resolve build error
david-salinas Sep 3, 2025
183883d
resolve PR comments
david-salinas Sep 12, 2025
81e2cc8
Merge branch 'main' into extend-offloading-api-llvm-readobj
david-salinas Sep 16, 2025
1ff1ea1
Merge branch 'main' into extend-offloading-api-llvm-readobj
david-salinas Sep 17, 2025
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2 changes: 1 addition & 1 deletion llvm/docs/CommandGuide/llvm-readelf.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -145,7 +145,7 @@ OPTIONS

.. option:: --offloading

Display list of HIP Offload bundles using URI syntax.
Display list of HIP offload bundles.

.. option:: --pretty-print

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2 changes: 1 addition & 1 deletion llvm/docs/CommandGuide/llvm-readobj.rst
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Expand Up @@ -106,7 +106,7 @@ file formats.

.. option:: --offloading

Display list of HIP Offload bundles using URI syntax.
Display list of HIP offload bundles.

.. option:: --relocations, --relocs, -r

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18 changes: 9 additions & 9 deletions llvm/lib/Object/OffloadBundle.cpp
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Expand Up @@ -89,17 +89,17 @@ Error OffloadBundleFatBin::readEntries(StringRef Buffer,
uint64_t EntryIDSize;
StringRef EntryID;

if (auto EC = Reader.readInteger(EntryOffset))
return errorCodeToError(object_error::parse_failed);
if (Error EC = Reader.readInteger(EntryOffset))
return std::move(EC);

if (auto EC = Reader.readInteger(EntrySize))
return errorCodeToError(object_error::parse_failed);
if (Error EC = Reader.readInteger(EntrySize))
return std::move(EC);

if (auto EC = Reader.readInteger(EntryIDSize))
return errorCodeToError(object_error::parse_failed);
if (Error EC = Reader.readInteger(EntryIDSize))
return std::move(EC);

if (auto EC = Reader.readFixedString(EntryID, EntryIDSize))
return errorCodeToError(object_error::parse_failed);
if (Error EC = Reader.readFixedString(EntryID, EntryIDSize))
return std::move(EC);

auto Entry = std::make_unique<OffloadBundleEntry>(
EntryOffset + SectionOffset, EntrySize, EntryIDSize, EntryID);
Expand All @@ -125,7 +125,7 @@ OffloadBundleFatBin::create(MemoryBufferRef Buf, uint64_t SectionOffset,
// Read the Bundle Entries
Error Err = TheBundle->readEntries(Buf.getBuffer(), SectionOffset);
if (Err)
return errorCodeToError(object_error::parse_failed);
return Err;

return std::unique_ptr<OffloadBundleFatBin>(TheBundle);
}
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28 changes: 28 additions & 0 deletions llvm/test/tools/llvm-readobj/ELF/AMDGPU/offloading_fail.test
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@@ -0,0 +1,28 @@
## Test that --offloading with a fatbin works correctly.
# REQUIRES: target={{x86_64-.*-linux.*}}
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Why? It's probably not true but needs commenting what the issue is if any

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I'm using the yaml2obj util to generate an object with a clang offload bundle with proper binary file layout (https://clang.llvm.org/docs/ClangOffloadBundler.html#bundled-binary-file-layout). But the yaml2obj util when built on Windows cannot handle "Content" field this large - even though I generated that from a HIP simple add source. Ideally we should be able more easily specify the metadata for the bundled binary in yaml, but that will require some work to the util/tool. I plan on doing this in a future PR. So even though we can generate an ELF Object on windows, the yaml2obj util has a bug on Windows that prevents this test from getting past the first RUN command.

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!windows would be better than only linux

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@jh7370 jh7370 Aug 21, 2025 •
edited
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As stated in an earlier comment, I have tested this on Windows and the yaml2obj code works absolutely fine for me. The test passes without any of the REQUIRES/UNSUPPORTED commands.

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A previous CI check failed on the yaml2obj command, on windows. I'll remove the limitation and see if it still fails.

# REQUIRES: amdgpu-registered-target
# UNSUPPORTED: system-windows

# RUN: yaml2obj %s -o %t.elf
# RUN: not llvm-readobj --offloading %t.elf 2>&1 | \
# RUN: FileCheck %s --check-prefix=ERR -DFILE_NAME=%t.elf

# ERR: error: '{{.*}}': Stream Error: The stream is too short to perform the requested operation.
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error messages should start with lowercase

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This is an existing error message, and it is used/checked in other tests.


--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Sections:
- Name: .hip_fatbin
Type: SHT_PROGBITS
AddressAlign: 0x1000
Content: 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- Name: .hipFatBinSegment
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
Address: 0x202FD0
AddressAlign: 0x8
Content: '465049480100000000102000000000000000000000000000'
...
2 changes: 1 addition & 1 deletion llvm/tools/llvm-readobj/ObjDumper.cpp
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Expand Up @@ -235,7 +235,7 @@ void ObjDumper::printSectionsAsHex(const object::ObjectFile &Obj,
void ObjDumper::printOffloading(const object::ObjectFile &Obj) {
SmallVector<llvm::object::OffloadBundleFatBin> Bundles;
if (Error Err = object::extractOffloadBundleFatBinary(Obj, Bundles))
reportWarning(std::move(Err), Obj.getFileName());
reportError(std::move(Err), Obj.getFileName());

// Print out all the FatBin Bundles that are contained in this buffer.
for (const auto &[Index, Bundle] : llvm::enumerate(Bundles))
Expand Down