llvm-readobj - LLVM Object Reader — LLVM 10 documentation

# llvm-readobj - LLVM Object Reader

## SYNOPSIS

llvm-readobj [options] [input…]

## DESCRIPTION

The llvm-readobj tool displays low-level format-specific information about one or more object files.

If `input` is “`-`” or omitted, llvm-readobj reads from standard input. Otherwise, it will read from the specified `filenames`.

## DIFFERENCES TO LLVM-READELF

llvm-readelf is an alias for the llvm-readobj tool with a slightly different command-line interface and output that is GNU compatible. Following is a list of differences between llvm-readelf and llvm-readobj:

- llvm-readelf uses GNU for the `--elf-output-style` option by default. llvm-readobj uses LLVM.
- llvm-readelf allows single-letter grouped flags (e.g. `llvm-readelf -SW` is the same as `llvm-readelf -S -W`). llvm-readobj does not allow grouping.
- llvm-readelf provides `-s` as an alias for `--symbols`, for GNU readelf compatibility, whereas it is an alias for `--section-headers` in llvm-readobj.
- llvm-readobj provides `-t` as an alias for `--symbols`. llvm-readelf does not.
- llvm-readobj provides `--sr`, `--sd`, `--st` and `--dt` as aliases for `--section-relocations`, `--section-data`, `--section-symbols` and `--dyn-symbols` respectively. llvm-readelf does not provide these aliases, to avoid conflicting with grouped flags.

## GENERAL AND MULTI-FORMAT OPTIONS

These options are applicable to more than one file format, or are unrelated to file formats.

`--all```

  Equivalent to specifying all the main display options relevant to the file format.

`--addrsig```

  Display the address-significance table.

`--color```

  Use colors in the output for warnings and errors.

`--expand-relocs```

  When used with `--relocations`, display each relocation in an expanded multi-line format.

`--file-headers````,` `-h```

  Display file headers.

`--headers````,` `-e```

  Equivalent to setting: `--file-headers`, `--program-headers`, and `--sections`.

`--help```

  Display a summary of command line options.

`--help-list```

  Display an uncategorized summary of command line options.

`--hex-dump``=<section[,section,...]>``,` `-x```

  Display the specified section(s) as hexadecimal bytes. `section` may be a section index or section name.

`--needed-libs```

  Display the needed libraries.

`--relocations````,` `--relocs````,` `-r```

  Display the relocation entries in the file.

`--sections````,` `--section-headers````,` `-s````,` `-S```

  Display all sections.

`--section-data````,` `--sd```

  When used with `--sections`, display section data for each section shown. This option has no effect for GNU style output.

`--section-relocations````,` `--sr```

  When used with `--sections`, display relocations for each section shown. This option has no effect for GNU style output.

`--section-symbols````,` `--st```

  When used with `--sections`, display symbols for each section shown. This option has no effect for GNU style output.

`--stackmap```

  Display contents of the stackmap section.

`--string-dump``=<section[,section,...]>``,` `-p```

  Display the specified section(s) as a list of strings. `section` may be a section index or section name.

`--symbols````,` `--syms````,` `-t```

  Display the symbol table.

`--unwind````,` `-u```

  Display unwind information.

`--version```

  Display the version of the llvm-readobj executable.

`@<FILE>```

  Read command-line options from response file <FILE>.

## ELF SPECIFIC OPTIONS

The following options are implemented only for the ELF file format.

`--arch-specific````,` `-A```

  Display architecture-specific information, e.g. the ARM attributes section on ARM.

`--demangle````,` `-C```

  Display demangled symbol names in the output.

`--dependent-libraries```

  Display the dependent libraries section.

`--dyn-relocations```

  Display the dynamic relocation entries.

`--dyn-symbols````,` `--dyn-syms````,` `--dt```

  Display the dynamic symbol table.

`--dynamic-table````,` `--dynamic````,` `-d```

  Display the dynamic table.

`--elf-cg-profile```

  Display the callgraph profile section.

`--elf-hash-histogram````,` `--histogram````,` `-I```

  Display a bucket list histogram for dynamic symbol hash tables.

`--elf-linker-options```

  Display the linker options section.

`--elf-output-style``=<value>`

  Format ELF information in the specified style. Valid options are `LLVM` and `GNU`. `LLVM` output (the default) is an expanded and structured format, whilst `GNU` output mimics the equivalent GNU readelf output.

`--elf-section-groups````,` `--section-groups````,` `-g```

  Display section groups.

`--gnu-hash-table```

  Display the GNU hash table for dynamic symbols.

`--hash-symbols```

  Display the expanded hash table with dynamic symbol data.

`--hash-table```

  Display the hash table for dynamic symbols.

`--notes````,` `-n```

  Display all notes.

`--program-headers````,` `--segments````,` `-l```

  Display the program headers.

`--raw-relr```

  Do not decode relocations in RELR relocation sections when displaying them.

`--section-mapping```

  Display the section to segment mapping.

`--stack-sizes```

  Display the contents of the stack sizes section(s), i.e. pairs of function names and the size of their stack frames. Currently only implemented for GNU style output.

`--version-info````,` `-V```

  Display version sections.

## MACH-O SPECIFIC OPTIONS

The following options are implemented only for the Mach-O file format.

`--macho-data-in-code```

  Display the Data in Code command.

`--macho-dsymtab```

  Display the Dsymtab command.

`--macho-indirect-symbols```

  Display indirect symbols.

`--macho-linker-options```

  Display the Mach-O-specific linker options.

`--macho-segment```

  Display the Segment command.

`--macho-version-min```

  Display the version min command.

## PE/COFF SPECIFIC OPTIONS

The following options are implemented only for the PE/COFF file format.

`--codeview```

  Display CodeView debug information.

`--codeview-ghash```

  Enable global hashing for CodeView type stream de-duplication.

`--codeview-merged-types```

  Display the merged CodeView type stream.

`--codeview-subsection-bytes```

  Dump raw contents of CodeView debug sections and records.

`--coff-basereloc```

  Display the .reloc section.

`--coff-debug-directory```

  Display the debug directory.

`--coff-directives```

  Display the .drectve section.

`--coff-exports```

  Display the export table.

`--coff-imports```

  Display the import table.

`--coff-load-config```

  Display the load config.

`--coff-resources```

  Display the .rsrc section.

## EXIT STATUS

llvm-readobj returns 0 under normal operation. It returns a non-zero exit code if there were any errors.

## SEE ALSO

llvm-nm(1), llvm-objdump(1), llvm-readelf(1)