Hello Martin,
On 16/11/2020 11:26, Martin Liška wrote:
Sorry for slow response.
Register the profile information in the specified section instead of
using a
constructor/destructor. A pointer to the profile information
generated by
-fprofile-arcs or -ftest-coverage is placed in the specified section
for each
translation unit. This option disables the profile information
registration
through a constructor and it disables the profile information processing
through a destructor.
The patch is fine.
thanks for having a look at it.
I am not sure how I can test this option. One approach would be to
assemble a
test file, then scan it and check that a .gcov_info section is
present and no
__gcov_init() and __gcov_exit() calls are present. Is there an
example for
this in the test suite?
I'm going to add a test for it. I'm going to test your patch and will
install
it after it finishes the tests.
Thanks for working on that. What will be your next steps in order to
support
profiling of your embedded target? Something I can help with?
I sent a proposal for a simple function to convert a gcov info to a gcda
byte stream:
https://lists.rtems.org/mailman/listinfo
It could be used for something like this:
#include <gcov.h>
#include <stdio.h>
extern const struct gcov_info *__gcov_info_start[];
extern const struct gcov_info *__gcov_info_end[];
static void
filename(const char *f, void *arg)
{
printf("filename: %s\n", f);
}
static void
dump(const void *d, unsigned n, void *arg)
{
const unsigned char *c;
unsigned i;
c = d;
for (i = 0; i < n; ++i) {
printf("%02x", c[i]);
}
}
static void dump_all(void)
{
const struct gcov_info **info;
const struct gcov_info **end;
info = __gcov_info_start;
end = __gcov_info_end;
/* Obfuscate variable to prevent compiler optimizations */
__asm__("" : "+r" (end));
while (info != end) {
__gcov_info_to_gcda(*info, filename, dump, NULL);
putchar('\n');
++info;
}
}
int main()
{
dump_all();
return 0;
}
In the linker command file you need these directives in a read-only
memory area:
PROVIDE (__gcov_info_start = .);
KEEP (*(.gcov_info))
PROVIDE (__gcov_info_end = .);
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