[llvm-readelf][docs] Add missing options and details to the help output and the command guide

[gbreynoo]

Summary

This change is to keep the help text and command guide of llvm-readelf in tandem.

• In the help text mention that --section-data, --section-relocations, --section-symbols and --stack-sizes have no effect on GNU style output; give the accepted values for --elf-output-style and update the description of --gnu-hash-table to use the command guide description.
• In the command guide add the missing options -a, --dependant-libraries,--no-demangle, --wide and -W. Also update the description of --symbols so it matches the help text.

[MaskRay]

LG

llvm/docs/CommandGuide/llvm-readelf.rst

202

You may additionally say that our style is similar to GNU readelf's -W.

llvm/tools/llvm-readobj/Opts.td

50

are are -> are

In some utilities we use colon to indicate choices, e.g. Specify ELF dump style: LLVM or GNU

[jhenderson]

llvm/tools/llvm-readobj/Opts.td

53

Other help text doesn't include trailing full stop.

llvm/docs/CommandGuide/llvm-readelf.rst

 about one or more object files.
 
 If ``input`` is "``-``", :program:`llvm-readelf` reads from standard
 input. Otherwise, it will read from the specified ``filenames``.
 
 OPTIONS
 -------
 
-.. option:: --all
+.. option:: --all, -a
 
  Equivalent to specifying all the main display options relevant to the file
  format.
 
 .. option:: --addrsig
 
  Display the address-significance table.
 
 .. option:: --arch-specific, -A
 
  Display architecture-specific information, e.g. the ARM attributes section on ARM.
 
 .. option:: --bb-addr-map
 
  Display the contents of the basic block address map section(s), which contain the
  address of each function, along with the relative offset of each basic block.
 
 .. option:: --demangle, -C
 
  Display demangled symbol names in the output.
  
+.. option:: --dependent-libraries
+
+ Display the dependent libraries section.
+
 .. option:: --dyn-relocations
 
  Display the dynamic relocation entries.
 
 .. option:: --dyn-symbols, --dyn-syms
 
  Display the dynamic symbol table.
 

 .. option:: --hex-dump=<section[,section,...]>, -x
 
  Display the specified section(s) as hexadecimal bytes. ``section`` may be a
  section index or section name.
 
 .. option:: --needed-libs
 
  Display the needed libraries.
   
+.. option:: --no-demangle
+
+ Do not display demangled symbol names in the output. On by default.
+
 .. option:: --notes, -n
 
  Display all notes.
 
 .. option:: --program-headers, --segments, -l
 
  Display the program headers.
 

 
 .. option:: --string-dump=<section[,section,...]>, -p
 
  Display the specified section(s) as a list of strings. ``section`` may be a
  section index or section name.
 
 .. option:: --symbols, --syms, -s
 
- Display the symbol table.
+ Display the symbol table. Also display the dynamic symbol table when using GNU output style for ELF.
 
 .. option:: --unwind, -u
 
  Display unwind information.
 
 .. option:: --version
 
  Display the version of the :program:`llvm-readelf` executable.
 
 .. option:: --version-info, -V
 
  Display version sections.
  
+.. option:: --wide, -W
+
+ Ignored for GNU readelf compatibility. The output is already similar to when using -W with GNU readelf.
+ 
 .. option:: @<FILE>
 
  Read command-line options from response file `<FILE>`.
 
 EXIT STATUS
 -----------
 
 :program:`llvm-readelf` returns 0 under normal operation. It returns a non-zero
 exit code if there were any errors.
 
 SEE ALSO
 --------
 
 :manpage:`llvm-nm(1)`, :manpage:`llvm-objdump(1)`, :manpage:`llvm-readobj(1)`

llvm/tools/llvm-readobj/Opts.td

 def dependent_libraries : FF<"dependent-libraries", "Display the dependent libraries section">;
 def dyn_relocations : FF<"dyn-relocations", "Display the dynamic relocation entries in the file">;
 def dyn_syms : FF<"dyn-syms", "Display the dynamic symbol table">;
 def expand_relocs : FF<"expand-relocs", "Expand each shown relocation to multiple lines">;
 def file_header : FF<"file-header", "Display file header">;
 def headers : FF<"headers", "Equivalent to setting: --file-header, --program-headers, --section-headers">;
 defm hex_dump : Eq<"hex-dump", "Display the specified section(s) as hexadecimal bytes">, MetaVarName<"<name or index>">;
 def relocs : FF<"relocs", "Display the relocation entries in the file">;
-def section_data : FF<"section-data", "Display section data for each section shown">;
+def section_data : FF<"section-data", "Display section data for each section shown. This option has no effect for GNU style output">;
 def section_details : FF<"section-details", "Display the section details">;
 def section_headers : FF<"section-headers", "Display section headers">;
 def section_mapping : FF<"section-mapping", "Display the section to segment mapping">;
 def section_mapping_EQ_false : FF<"section-mapping=false", "Don't display the section to segment mapping">, Flags<[HelpHidden]>;
-def section_relocations : FF<"section-relocations", "Display relocations for each section shown">;
-def section_symbols : FF<"section-symbols", "Display symbols for each section shown">;
-def stack_sizes : FF<"stack-sizes", "Display contents of all stack sizes sections">;
+def section_relocations : FF<"section-relocations", "Display relocations for each section shown. This option has no effect for GNU style output">;
+def section_symbols : FF<"section-symbols", "Display symbols for each section shown. This option has no effect for GNU style output">;
+def stack_sizes : FF<"stack-sizes", "Display contents of all stack sizes sections. This option has no effect for GNU style output">;
 def stackmap : FF<"stackmap", "Display contents of stackmap section">;
 defm string_dump : Eq<"string-dump", "Display the specified section(s) as a list of strings">, MetaVarName<"<name or index>">;
 def string_table : FF<"string-table", "Display the string table (only for XCOFF now)">;
 def symbols : FF<"symbols", "Display the symbol table. Also display the dynamic symbol table when using GNU output style for ELF">;
 def unwind : FF<"unwind", "Display unwind information">;
 
 // ELF specific options.
 def grp_elf : OptionGroup<"kind">, HelpText<"OPTIONS (ELF specific)">;
 def dynamic_table : FF<"dynamic-table", "Display the dynamic section table">, Group<grp_elf>;
 def elf_linker_options : FF<"elf-linker-options", "Display the .linker-options section">, Group<grp_elf>;
-defm elf_output_style : Eq<"elf-output-style", "Specify ELF dump style">, Group<grp_elf>;
+defm elf_output_style : Eq<"elf-output-style", "Specify ELF dump style: LLVM or GNU">, Group<grp_elf>;
 def histogram : FF<"histogram", "Display bucket list histogram for hash sections">, Group<grp_elf>;
 def section_groups : FF<"section-groups", "Display section groups">, Group<grp_elf>;
-def gnu_hash_table : FF<"gnu-hash-table", "Display .gnu.hash section">, Group<grp_elf>;
+def gnu_hash_table : FF<"gnu-hash-table", "Display the GNU hash table for dynamic symbols">, Group<grp_elf>;
 def hash_symbols : FF<"hash-symbols", "Display the dynamic symbols derived from the hash section">, Group<grp_elf>;
 def hash_table : FF<"hash-table", "Display .hash section">, Group<grp_elf>;
 def needed_libs : FF<"needed-libs", "Display the needed libraries">, Group<grp_elf>;
 def notes : FF<"notes", "Display notes">, Group<grp_elf>;
 def program_headers : FF<"program-headers", "Display program headers">, Group<grp_elf>;
 def raw_relr : FF<"raw-relr", "Do not decode relocations in SHT_RELR section, display raw contents">, Group<grp_elf>;
 def version_info : FF<"version-info", "Display version sections">, Group<grp_elf>;