[Dwarf-discuss] Macros after "#include" does not show up DWARF

[Lorenzo Gomez]

Hi there,


I'm currently using dwarfdump "2020-01-14 10:13:32-08:00 Package Version 
"20200114"" to look at macros inside the DWARF.


Imagine two files; test_file1.h and test_file1.cpp

test_file1.cpp is defined as follows:


    /*
      * test_file.cpp
      *
      */

    #ifdef __cplusplus
    extern "C" {
    #endif

    #include "test_file1.h"

    #include <fcntl.h>
    #include <stdio.h>
    #include <sys/stat.h>
    #include <sys/types.h>
    #include <unistd.h>

    Square                                         sq              = {};
    Circle                                         ci              = {};
    #ifdef __cplusplus
    }
    #endif





Here are two scenarios for the definition of test_file1.h.


Scenario #1

   test_file.h is defined as follows:

    #include "stdint.h"

    #define CFE_MISSION_ES_PERF_MAX_IDS 128



    typedef struct CFE_ES_HousekeepingTlm_Payload
    {
         uint32_t PerfFilterMask[CFE_MISSION_ES_PERF_MAX_IDS / 32]; /**<
    \cfetlmmnemonic \ES_PERFFLTRMASK
                                                                \brief
    Current Setting of Performance Analyzer Filter Masks */
         uint32_t PerfTriggerMask[CFE_MISSION_ES_PERF_MAX_IDS / 32];
    /**< \cfetlmmnemonic \ES_PERFTRIGMASK
    \brief Current Setting of Performance Analyzer Trigger Masks */
    } CFE_ES_HousekeepingTlm_Payload_t;



After compiling with "gcc  -g3 -c -gdwarf-4  test_file1.cpp -o 
test_file1_copy_dwarf4.o" and then running "dwarfdump 
test_file1_dwarf4.o > dwarf4_test_file1.txt". The Macro doe NOT show up 
in dwarf4_test_file1.txt. It does show up under the debug string table 
but not under the "debug_macro" section.





Scenario #2

   test_file.h is defined as follows:


         #define CFE_MISSION_ES_PERF_MAX_IDS 128

    #include "stdint.h"



    typedef struct CFE_ES_HousekeepingTlm_Payload
    {
         uint32_t PerfFilterMask[CFE_MISSION_ES_PERF_MAX_IDS / 32]; /**<
    \cfetlmmnemonic \ES_PERFFLTRMASK
                                                                \brief
    Current Setting of Performance Analyzer Filter Masks */
         uint32_t PerfTriggerMask[CFE_MISSION_ES_PERF_MAX_IDS / 32];
    /**< \cfetlmmnemonic \ES_PERFTRIGMASK
    \brief Current Setting of Performance Analyzer Trigger Masks */
    } CFE_ES_HousekeepingTlm_Payload_t;



After compiling with "gcc  -g3 -c -gdwarf-4  test_file1.cpp -o 
test_file1_dwarf4.o" and then running "dwarfdump test_file1_dwarf4.o 
 > dwarf4_test_file1.txt". The Macro DOES show up in 
dwarf4_test_file1.txt. It does show up under the "debug_macro" section.


Is there a reason why in order for macros to show up they have to be 
declared /before /the #include macro(s)?


Perhaps I'm missing something obvious?

Some more info about my system(x86 Intel CPU):

NAME="Pop!_OS"
VERSION="20.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
LOGO=distributor-logo-pop-os




Thanks

Lorenzo











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