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gccarmtracearmcc

How to use 'armcc' compiler to trace function calls?

I used to use gcc -fdump-rtl-expand and -finstrument-functions to do function call tracing, does armcc has this kind of similar function?

For gcc, I use:

CFLAGS += -finstrument-functions -fdump-rtl-expand

Does armcc have similar compiler options? I tried the same ones, but it seems they do not work:

$ armcc -finstrument-functions test.c
Fatal error: C3900U: Unrecognized option '-finstrument-functions'.
$ armcc -fdump-rtl-expand test.c
Fatal error: C3900U: Unrecognized option '-fdump-rtl-expand'.
Solution

  • It appears that the option which allows gcc style instrumentation with armcc is different.

    Here is an extract from ARM Compiler Toolchain: Compiler Reference (You can access the reference at http://infocenter.arm.com, if you 'register' on their website):

    --gnu_instrument, --no_gnu_instrument

    This option inserts GCC-style instrumentation calls for profiling entry and exit to functions.

    Usage

    After function entry and before function exit, the following profiling functions are called with the address of the current function and its call site:

    void __cyg_profile_func_enter(void *current_func, void *callsite);

    void __cyg_profile_func_exit(void *current_func, void *callsite);

    Restrictions

    You must provide definitions of __cyg_profile_func_enter() and __cyg_profile_func_exit().

    It is necessary to explicitly mark __cyg_profile_func_enter() and __cyg_profile_func_exit() with __attribute__((no_instrument_function)).

    See also

    __attribute__((no_instrument_function)) function attribute.

    As to the -fdump-rtl-expand option: I do not know (and do not think) that armcc uses RTL internally. So I do not think obtaining the logs from the expand pass makes any sense here.