10. addr2line

addr2line [‘-b’ bfdname|‘--target=’bfdname]
          [‘-C’|‘--demangle’[=style]]
          [‘-e’ filename|‘--exe=’filename]
          [‘-f’|‘--functions’] [‘-s’|‘--basename’]
          [‘-i’|‘--inlines’]
          [‘-j’|‘--section=’name]
          [‘-H’|‘--help’] [‘-V’|‘--version’]
          [addr addr …]

addr2line translates addresses into file names and line numbers. Given an address in an executable or an offset in a section of a relocatable object, it uses the debugging information to figure out which file name and line number are associated with it.

The executable or relocatable object to use is specified with the ‘-e’ option. The default is the file ‘a.out’. The section in the relocatable object to use is specified with the ‘-j’ option.

addr2line has two modes of operation.

In the first, hexadecimal addresses are specified on the command line, and addr2line displays the file name and line number for each address.

In the second, addr2line reads hexadecimal addresses from standard input, and prints the file name and line number for each address on standard output. In this mode, addr2line may be used in a pipe to convert dynamically chosen addresses.

The format of the output is ‘FILENAME:LINENO’. The file name and line number for each address is printed on a separate line. If the -f option is used, then each ‘FILENAME:LINENO’ line is preceded by a ‘FUNCTIONNAME’ line which is the name of the function containing the address.

If the file name or function name can not be determined, addr2line will print two question marks in their place. If the line number can not be determined, addr2line will print 0.

The long and short forms of options, shown here as alternatives, are equivalent.

-b bfdname

--target=bfdname

Specify that the object-code format for the object files is bfdname.

-C

--demangle[=style]

Decode (demangle) low-level symbol names into user-level names. Besides removing any initial underscore prepended by the system, this makes C++ function names readable. Different compilers have different mangling styles. The optional demangling style argument can be used to choose an appropriate demangling style for your compiler. See section c++filt, for more information on demangling.

-e filename

--exe=filename

Specify the name of the executable for which addresses should be translated. The default file is ‘a.out’.

-f

--functions

Display function names as well as file and line number information.

-s

--basenames

Display only the base of each file name.

-i

--inlines

If the address belongs to a function that was inlined, the source information for all enclosing scopes back to the first non-inlined function will also be printed. For example, if main inlines callee1 which inlines callee2, and address is from callee2, the source information for callee1 and main will also be printed.

-j

--section

Read offsets relative to the specified section instead of absolute addresses.