204 lines
6.8 KiB
ReStructuredText
204 lines
6.8 KiB
ReStructuredText
llvm-dwarfdump - dump and verify DWARF debug information
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========================================================
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.. program:: llvm-dwarfdump
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SYNOPSIS
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--------
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:program:`llvm-dwarfdump` [*options*] [*filename ...*]
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DESCRIPTION
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-----------
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:program:`llvm-dwarfdump` parses DWARF sections in object files,
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archives, and `.dSYM` bundles and prints their contents in
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human-readable form. Only the .debug_info section is printed unless one of
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the section-specific options or :option:`--all` is specified.
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If no input file is specified, `a.out` is used instead. If `-` is used as the
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input file, :program:`llvm-dwarfdump` reads the input from its standard input
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stream.
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OPTIONS
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-------
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.. option:: -a, --all
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Dump all supported DWARF sections.
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.. option:: --arch=<arch>
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Dump DWARF debug information for the specified CPU architecture.
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Architectures may be specified by name or by number. This
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option can be specified multiple times, once for each desired
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architecture. All CPU architectures will be printed by
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default.
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.. option:: -c, --show-children
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Show a debug info entry's children when selectively printing with
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the `=<offset>` argument of :option:`--debug-info`, or options such
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as :option:`--find` or :option:`--name`.
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.. option:: --color
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Use colors in output.
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.. option:: -f <name>, --find=<name>
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Search for the exact text <name> in the accelerator tables
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and print the matching debug information entries.
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When there is no accelerator tables or the name of the DIE
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you are looking for is not found in the accelerator tables,
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try using the slower but more complete :option:`--name` option.
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.. option:: -F, --show-form
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Show DWARF form types after the DWARF attribute types.
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.. option:: -h, --help
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Show help and usage for this command.
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.. option:: --help-list
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Show help and usage for this command without grouping the options
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into categories.
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.. option:: -i, --ignore-case
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Ignore case distinctions when using :option:`--name`.
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.. option:: -n <name>, --name=<name>
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Find and print all debug info entries whose name
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(`DW_AT_name` attribute) is <name>.
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.. option:: --lookup=<address>
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Look up <address> in the debug information and print out the file,
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function, block, and line table details.
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.. option:: -o <path>
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Redirect output to a file specified by <path>, where `-` is the
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standard output stream.
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.. option:: -p, --show-parents
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Show a debug info entry's parents when selectively printing with
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the `=<offset>` argument of :option:`--debug-info`, or options such
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as :option:`--find` or :option:`--name`.
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.. option:: --parent-recurse-depth=<N>
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When displaying debug info entry parents, only show them to a
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maximum depth of <N>.
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.. option:: --quiet
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Use with :option:`--verify` to not emit to `STDOUT`.
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.. option:: -r <N>, --recurse-depth=<N>
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When displaying debug info entries, only show children to a maximum
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depth of <N>.
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.. option:: --show-section-sizes
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Show the sizes of all debug sections, expressed in bytes.
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.. option:: --statistics
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Collect debug info quality metrics and print the results
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as machine-readable single-line JSON output. The output
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format is described in the section below (:ref:`stats-format`).
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.. option:: --summarize-types
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Abbreviate the description of type unit entries.
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.. option:: -x, --regex
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Treat any <name> strings as regular expressions when searching
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with :option:`--name`. If :option:`--ignore-case` is also specified,
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the regular expression becomes case-insensitive.
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.. option:: -u, --uuid
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Show the UUID for each architecture.
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.. option:: --diff
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Dump the output in a format that is more friendly for comparing
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DWARF output from two different files.
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.. option:: -v, --verbose
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Display verbose information when dumping. This can help to debug
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DWARF issues.
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.. option:: --verify
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Verify the structure of the DWARF information by verifying the
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compile unit chains, DIE relationships graph, address
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ranges, and more.
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.. option:: --version
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Display the version of the tool.
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.. option:: --debug-abbrev, --debug-addr, --debug-aranges, --debug-cu-index, --debug-frame [=<offset>], --debug-gnu-pubnames, --debug-gnu-pubtypes, --debug-info [=<offset>], --debug-line [=<offset>], --debug-line-str, --debug-loc [=<offset>], --debug-loclists [=<offset>], --debug-macro, --debug-names, --debug-pubnames, --debug-pubtypes, --debug-ranges, --debug-rnglists, --debug-str, --debug-str-offsets, --debug-tu-index, --debug-types [=<offset>], --eh-frame [=<offset>], --gdb-index, --apple-names, --apple-types, --apple-namespaces, --apple-objc
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Dump the specified DWARF section by name. Only the
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`.debug_info` section is shown by default. Some entries
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support adding an `=<offset>` as a way to provide an
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optional offset of the exact entry to dump within the
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respective section. When an offset is provided, only the
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entry at that offset will be dumped, else the entire
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section will be dumped.
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The :option:`--debug-macro` option prints both the .debug_macro and the .debug_macinfo sections.
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The :option:`--debug-frame` and :option:`--eh-frame` options are aliases, in cases where both sections are present one command outputs both.
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.. option:: @<FILE>
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Read command-line options from `<FILE>`.
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.. _stats-format:
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FORMAT OF STATISTICS OUTPUT
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---------------------------
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The :option:`--statistics` option generates single-line JSON output
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representing quality metrics of the processed debug info. These metrics are
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useful to compare changes between two compilers, particularly for judging
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the effect that a change to the compiler has on the debug info quality.
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The output is formatted as key-value pairs. The first pair contains a version
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number. The following naming scheme is used for the keys:
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- `variables` ==> local variables and parameters
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- `local vars` ==> local variables
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- `params` ==> formal parameters
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For aggregated values, the following keys are used:
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- `sum_of_all_variables(...)` ==> the sum applied to all variables
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- `#bytes` ==> the number of bytes
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- `#variables - entry values ...` ==> the number of variables excluding
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the entry values etc.
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EXIT STATUS
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-----------
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:program:`llvm-dwarfdump` returns 0 if the input files were parsed and dumped
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successfully. Otherwise, it returns 1.
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SEE ALSO
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--------
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:manpage:`dsymutil(1)`
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