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tests: Detect llvm coverage run and redirect to real I/O functions

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Code coverage writes data to disk, we need to use real io functions at
this point so that the data is really written.

BUG=b:187647884
BRANCH=None
TEST=llvm-profdata merge -sparse default.profraw -o default.profdata
TEST=llvm-cov show ./flashrom_unit_tests
-instr-profile=default.profdata --format=html --output-dir=.

Change-Id: I21cc1d631e92fa19006b967e85676f108e80b307
Signed-off-by: Evan Benn <evanbenn@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/69267
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Evan Benn
2022-11-04 17:00:40 +11:00
committed by Anastasia Klimchuk
parent bcaaae15ae
commit 819c275074
4 changed files with 31 additions and 1 deletions
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17
tests/io_real.c
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@ -25,6 +25,12 @@ static int io_real_open(void *state, const char *pathname, int flags, mode_t mod
return __real_open(pathname, flags, mode);
}
static FILE *io_real_fopen(void *state, const char *pathname, const char *mode)
{
LOG_ME;
return __real_fopen(pathname, mode);
}
static FILE *io_real_fdopen(void *state, int fd, const char *mode)
{
LOG_ME;
@ -36,13 +42,21 @@ static size_t io_real_fwrite(void *state, const void *ptr, size_t size, size_t n
return __real_fwrite(ptr, size, nmemb, fp);
}
static int io_real_fclose(void *state, FILE *fp)
{
LOG_ME;
return __real_fclose(fp);
}
/* Mock ios that defer to the real io functions.
* These exist so that code coverage can print to real files on disk.
*/
static const struct io_mock real_io = {
.iom_open = io_real_open,
.iom_fopen = io_real_fopen,
.iom_fwrite = io_real_fwrite,
.iom_fdopen = io_real_fdopen,
.iom_fclose = io_real_fclose,
};
/* Return 0 if string ends with suffix. */
@ -58,6 +72,7 @@ static int check_suffix(const char *string, const char *suffix)
void maybe_unmock_io(const char *pathname)
{
const char *gcov_suffix = ".gcda";
if (!check_suffix(pathname, gcov_suffix))
const char *llvm_cov_suffix = ".profraw";
if (!check_suffix(pathname, gcov_suffix) || !check_suffix(pathname, llvm_cov_suffix))
io_mock_register(&real_io);
}