lorenzo-gomez-windhover
commented
1 month ago Another quirk: 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>
#ifdef __cplusplus
}
#endifHere 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)?
If I link the "test_file1.o" file with "gcc -g3 -nostartfiles -Llib -gdwarf-4 test_file1_copy.o -o test_file1_linked_dwarf4.o" the macro shows up in the DWARF, regardless of whether it is defined before/after the #include.
When redefining a macro like this:
For some reason that macro does not appear to be in the DWARF section anymore.
Tested this with:
dwarfdump 2020-01-14 10:13:32-08:00 Package Version "20200114".Some links of interest: