Man1 - llvm-dwarfdump.1

Table of Contents

NAME

llvm-dwarfdump - dump and verify DWARF debug information

SYNOPSIS

llvm-dwarfdump [/options/] [/filename …/]

DESCRIPTION

llvm-dwarfdump parses DWARF sections in object files, archives, and .dSYM bundles and prints their contents in human-readable form. Only the .debug_info section is printed unless one of the section-specific options or –all is specified.

If no input file is specified, a.out is used instead. If - is used as the input file, llvm-dwarfdump reads the input from its standard input stream.

OPTIONS

-a, –all
Dump all supported DWARF sections.
–arch=<arch>
Dump DWARF debug information for the specified CPU architecture. Architectures may be specified by name or by number. This option can be specified multiple times, once for each desired architecture. All CPU architectures will be printed by default.
-c, –show-children
Show a debug info entry’s children when selectively printing with the =<offset> argument of –debug-info, or options such as –find or –name.
–color
Use colors in output.
-f <name>, –find=<name>
Search for the exact text <name> in the accelerator tables and print the matching debug information entries. When there is no accelerator tables or the name of the DIE you are looking for is not found in the accelerator tables, try using the slower but more complete –name option.
-F, –show-form
Show DWARF form types after the DWARF attribute types.
-h, –help
Show help and usage for this command.
–help-list
Show help and usage for this command without grouping the options into categories.
-i, –ignore-case
Ignore case distinctions when using –name.
-n <name>, –name=<name>
Find and print all debug info entries whose name (DW_AT_name attribute) is <name>.
–lookup=<address>
Look up <address> in the debug information and print out the file, function, block, and line table details.
-o <path>
Redirect output to a file specified by <path>, where - is the standard output stream.
-p, –show-parents
Show a debug info entry’s parents when selectively printing with the =<offset> argument of –debug-info, or options such as –find or –name.
–parent-recurse-depth=<N>
When displaying debug info entry parents, only show them to a maximum depth of <N>.
–quiet
Use with –verify to not emit to STDOUT.
-r <N>, –recurse-depth=<N>
When displaying debug info entries, only show children to a maximum depth of <N>.
–show-section-sizes
Show the sizes of all debug sections, expressed in bytes.
–statistics
Collect debug info quality metrics and print the results as machine-readable single-line JSON output. The output format is described in the section below (FORMAT OF STATISTICS OUTPUT).
–summarize-types
Abbreviate the description of type unit entries.
-x, –regex
Treat any <name> strings as regular expressions when searching with –name. If –ignore-case is also specified, the regular expression becomes case-insensitive.
-u, –uuid
Show the UUID for each architecture.
–diff
Dump the output in a format that is more friendly for comparing DWARF output from two different files.
-v, –verbose
Display verbose information when dumping. This can help to debug DWARF issues.
–verify
Verify the structure of the DWARF information by verifying the compile unit chains, DIE relationships graph, address ranges, and more.
–version
Display the version of the tool.
  • –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 :: Dump the specified DWARF section by name. Only the .debug_info section is shown by default. Some entries support adding an =<offset> as a way to provide an optional offset of the exact entry to dump within the respective section. When an offset is provided, only the entry at that offset will be dumped, else the entire section will be dumped.
@<FILE>
Read command-line options from <FILE>.

FORMAT OF STATISTICS OUTPUT

The :/–statistics/ option generates single-line JSON output representing quality metrics of the processed debug info. These metrics are useful to compare changes between two compilers, particularly for judging the effect that a change to the compiler has on the debug info quality.

The output is formatted as key-value pairs. The first pair contains a version number. The following naming scheme is used for the keys:

#+begin_quote

#+begin_quote

  • variables ==> local variables and parameters
  • local vars ==> local variables
  • params ==> formal parameters

#+end_quote #+end_quote

For aggregated values, the following keys are used:

#+begin_quote

#+begin_quote

  • sum_of_all_variables(…) ==> the sum applied to all variables
  • #bytes ==> the number of bytes
  • #variables - entry values … ==> the number of variables excluding the entry values etc.

#+end_quote #+end_quote

EXIT STATUS

llvm-dwarfdump returns 0 if the input files were parsed and dumped successfully. Otherwise, it returns 1.

SEE ALSO

dsymutil(1)

AUTHOR

Maintained by the LLVM Team (https://llvm.org/).

COPYRIGHT

2003-2021, LLVM Project

Author: dt

Created: 2022-02-22 Tue 17:11