[M] Change in flashrom[master]: tests: Detect llvm coverage run and redirect to real I/O functions

[Anastasia Klimchuk (Code Review)]

Anastasia Klimchuk has submitted this change. ( https://review.coreboot.org/c/flashrom/+/69267 )

(

13 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: tests: Detect llvm coverage run and redirect to real I/O functions
......................................................................

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

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 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/69267
Reviewed-by: Anastasia Klimchuk 
Tested-by: build bot (Jenkins) 
---
M Documentation/building.md
M tests/io_real.c
M tests/tests.c
M tests/wraps.h
4 files changed, 53 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Anastasia Klimchuk: Looks good to me, approved

diff --git a/Documentation/building.md b/Documentation/building.md
index 81daeb0..e25482e 100644
--- a/Documentation/building.md
+++ b/Documentation/building.md
@@ -60,6 +60,17 @@
 ninja -C buildcov coverage
 ```

+#### llvm
+https://clang.llvm.org/docs/SourceBasedCodeCoverage.html
+```
+env CFLAGS="-fprofile-instr-generate -fcoverage-mapping" CC=clang meson setup buildclangcov
+env LLVM_PROFILE_FILE=default.profraw ninja -C buildclangcov test
+cd buildclangcov
+llvm-profdata merge -sparse default.profraw -o default.profdata
+llvm-cov show ./flashrom_unit_tests -instr-profile=default.profdata --format=html --output-dir=.
+open index.html
+```
+
 ## System specific information
 ### Ubuntu / Debian (Linux)
   * __linux-headers__ are version specific
diff --git a/tests/io_real.c b/tests/io_real.c
index 9f9e9d6..429027f 100644
--- a/tests/io_real.c
+++ b/tests/io_real.c
@@ -25,6 +25,12 @@
    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 @@
    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 @@
 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);
 }
diff --git a/tests/tests.c b/tests/tests.c
index b11f642..a1dcaca 100644
--- a/tests/tests.c
+++ b/tests/tests.c
@@ -170,6 +170,7 @@
 FILE *__wrap_fopen(const char *pathname, const char *mode)
 {
    LOG_ME;
+	maybe_unmock_io(pathname);
    if (get_io() && get_io()->iom_fopen)
    	return get_io()->iom_fopen(get_io()->state, pathname, mode);
    return not_null();
@@ -178,6 +179,7 @@
 FILE *__wrap_fopen64(const char *pathname, const char *mode)
 {
    LOG_ME;
+	maybe_unmock_io(pathname);
    if (get_io() && get_io()->iom_fopen)
    	return get_io()->iom_fopen(get_io()->state, pathname, mode);
    return not_null();
diff --git a/tests/wraps.h b/tests/wraps.h
index 92b0c42..6cc9567 100644
--- a/tests/wraps.h
+++ b/tests/wraps.h
@@ -36,6 +36,7 @@
 int __wrap_write(int fd, const void *buf, size_t sz);
 int __wrap_read(int fd, void *buf, size_t sz);
 FILE *__wrap_fopen(const char *pathname, const char *mode);
+FILE *__real_fopen(const char *pathname, const char *mode);
 FILE *__wrap_fopen64(const char *pathname, const char *mode);
 FILE *__wrap_fdopen(int fd, const char *mode);
 FILE *__real_fdopen(int fd, const char *mode);
@@ -59,6 +60,7 @@
 int __wrap_fprintf(FILE *fp, const char *fmt, ...);
 int __wrap___vfprintf_chk(FILE *fp, const char *fmt, va_list args);
 int __wrap_fclose(FILE *fp);
+int __real_fclose(FILE *fp);
 int __wrap_feof(FILE *fp);
 int __wrap_ferror(FILE *fp);
 void __wrap_clearerr(FILE *fp);