Description

Print callsite addresses for inlined function calls, understands the following command line arguments:

      --cu=<name>            Filter callsites by calling file name
      --dwarf-details        Print DIE offset and DWARF expressions for formal
                             parameters
      --file=<file>          Filter callsites by called function file of origin
                            
      --func=<function>      Filter callsites by called function name
      --no-stats             Don't print stats
      --stats-only           Print stats about callsites and formals, don't
                             print actual DIEs
  -?, --help                 Give this help list
      --usage                Give a short usage message

Example usage #1:

$ ./inline_address_printer ~/work/bpf-next/vmlinux --func subprog_name
# file:func                                                                       callsite           parameters...
/home/eddy/work/bpf-next/kernel/bpf/verifier.c:subprog_name                       0xffffffff8126ee3c rbx r12
/home/eddy/work/bpf-next/kernel/bpf/verifier.c:subprog_name                       0xffffffff8126d6f5 r14 rbp
/home/eddy/work/bpf-next/kernel/bpf/verifier.c:subprog_name                       0xffffffff81274205 rbx r12

# Total inlined callsites                             : 3
#   with all formals present                          : 3 (100%)
#   with all formals present and in simple locations  : 3 (100%)
#
# Total formals                                       : 6
#   with location                                     : 6 (100%)
#   with simple location                              : 6 (100%)

The above prints all locations recorded in DWARF, where function subprog_name() was inlined.

Example usage #2:

$ ./inline_address_printer ~/work/bpf-next/vmlinux --stats-only

# Total inlined callsites                             : 345592
#   with all formals present                          : 240655 (70%)
#   with all formals present and in simple locations  : 231864 (67%)
#
# Total formals                                       : 457151
#   with location                                     : 436205 (95%)
#   with simple location                              : 425309 (93%)

Get some statistics about inlined functions in the binary file:

• how many inlined function callsites recorded in DWARF;
• how many such callsites have enough DW_TAG_formal_parameter tags to describe all formal parameters;
• how many such callsites also have all DW_TAG_formal_parameter with DW_AT_location describing a simple location;
• how many DW_TAG_formal_parameter DIEs are children of DW_TAG_inlined_subroutine DIEs;
• how many of such DW_TAG_formal_parameter DIEs describe easily accessible manner to read the formal parameter and callsite address.

Where "simple location" means that actual value of the formal is available as:

• a register;
• a register + constant value;
• a constant value;

Build instructions

Just do make in the project directory. Depends on libelf and libdw, on Fedora these are available as the following packages:

• elfutils-libelf
• elfutils-libs
• elfutils-devel