test-signalhandler: test SIGFPE / assert exitcodes (danmar#7238)

Author: firewave

test/signal/test-signalhandler.cpp

@@ -16,17 +16,24 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE // required to have feenableexcept()
+#endif
+
 #include "config.h"
 
 #if defined(USE_UNIX_SIGNAL_HANDLING)
 #include "signalhandler.h"
 
 #include <cassert>
-#include <cfenv>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
 
+#if !defined(__APPLE__)
+#include <cfenv>
+#endif
+
 // static functions are omitted from trace
 
 /*static*/ NORETURN void my_assert() // NOLINT(misc-use-internal-linkage)
@@ -45,15 +52,17 @@
     ++*(int*)nullptr;
 }
 
-/*static*/ void my_fpe() // NOLINT(misc-use-internal-linkage)
-{
 #if !defined(__APPLE__)
-    feenableexcept(FE_ALL_EXCEPT); // TODO: check result
-#endif
-    std::feraiseexcept(FE_UNDERFLOW | FE_DIVBYZERO); // TODO: check result
-    // TODO: to generate this via code
+/*static*/ int my_fpe() // NOLINT(misc-use-internal-linkage)
+{
+    if (feenableexcept(FE_ALL_EXCEPT) == -1)
+        return 2;
+    if (std::feraiseexcept(FE_ALL_EXCEPT) != 0)
+        return 3;
+    return 1 % -1;
 }
 #endif
+#endif
 
 int main(int argc, const char * const argv[])
 {
@@ -67,10 +76,12 @@ int main(int argc, const char * const argv[])
         my_assert();
     else if (strcmp(argv[1], "abort") == 0)
         my_abort();
-    else if (strcmp(argv[1], "fpe") == 0)
-        my_fpe();
     else if (strcmp(argv[1], "segv") == 0)
         my_segv();
+#if !defined(__APPLE__)
+    else if (strcmp(argv[1], "fpe") == 0)
+        return my_fpe();
+#endif
 
     return 0;
 #else

test/signal/test-signalhandler.py

@@ -32,54 +32,57 @@ def __call_process(arg):
 
 
 def test_assert():
-    _, stdout, stderr = __call_process('assert')
+    exitcode, stdout, stderr = __call_process('assert')
     if sys.platform == "darwin":
         assert stderr.startswith("Assertion failed: (false), function my_assert, file test-signalhandler.cpp, line "), stderr
     else:
-        assert stderr.endswith("test-signalhandler.cpp:34: void my_assert(): Assertion `false' failed.\n"), stderr
+        assert stderr.endswith("test-signalhandler.cpp:41: void my_assert(): Assertion `false' failed.\n"), stderr
     lines = stdout.splitlines()
     assert lines[0] == 'Internal error: cppcheck received signal SIGABRT - abort or assertion'
-    # no stacktrace of MacOs
+    # no stacktrace of macOS
     if sys.platform != "darwin":
         assert lines[1] == 'Callstack:'
         assert lines[2].endswith('my_abort()'), lines[2]  # TODO: wrong function
         assert lines[len(lines)-1] == 'Please report this to the cppcheck developers!'
+    assert exitcode == -6
 
 
 def test_abort():
-    _, stdout, _ = __call_process('abort')
+    exitcode, stdout, _ = __call_process('abort')
     lines = stdout.splitlines()
     assert lines[0] == 'Internal error: cppcheck received signal SIGABRT - abort or assertion'
-    # no stacktrace on MaCos
+    # no stacktrace on macOS
     if sys.platform != "darwin":
         assert lines[1] == 'Callstack:'
         assert lines[2].endswith('my_segv()'), lines[2]  # TODO: wrong function
         assert lines[len(lines)-1] == 'Please report this to the cppcheck developers!'
+    assert exitcode == -6
 
 
 def test_segv():
-    _, stdout, stderr = __call_process('segv')
+    exitcode, stdout, stderr = __call_process('segv')
     assert stderr == ''
     lines = stdout.splitlines()
     if sys.platform == "darwin":
         assert lines[0] == 'Internal error: cppcheck received signal SIGSEGV - SEGV_MAPERR (at 0x0).'
     else:
         assert lines[0] == 'Internal error: cppcheck received signal SIGSEGV - SEGV_MAPERR (reading at 0x0).'
-    # no stacktrace on MacOS
+    # no stacktrace on macOS
     if sys.platform != "darwin":
         assert lines[1] == 'Callstack:'
         assert lines[2].endswith('my_segv()'), lines[2]  # TODO: wrong function
         assert lines[len(lines)-1] == 'Please report this to the cppcheck developers!'
+    assert exitcode == -11
 
 
-# TODO: make this work
-@pytest.mark.skip
+@pytest.mark.skipif(sys.platform == 'darwin', reason='Cannot raise FPE on macOS')
 def test_fpe():
-    _, stdout, stderr = __call_process('fpe')
+    exitcode, stdout, stderr = __call_process('fpe')
     assert stderr == ''
     lines = stdout.splitlines()
-    assert lines[0].startswith('Internal error: cppcheck received signal SIGFPE - FPE_FLTDIV (at 0x7f'), lines[0]
+    assert lines[0].startswith('Internal error: cppcheck received signal SIGFPE - FPE_FLTINV (at 0x'), lines[0]
     assert lines[0].endswith(').'), lines[0]
     assert lines[1] == 'Callstack:'
-    assert lines[2].endswith('my_fpe()'), lines[2]
+    assert lines[3].endswith('my_fpe()'), lines[2]
     assert lines[len(lines)-1] == 'Please report this to the cppcheck developers!'
+    assert exitcode == -8