Add tests that backtrace and backtrace_symbols produce correct results.

1 files changed, 111 insertions, 0 deletions

diff --git a/debug/tst-backtrace2.c b/debug/tst-backtrace2.c
new file mode 100644
index 0000000..e1d4572
--- /dev/null
+++ b/debug/tst-backtrace2.c
@@ -0,0 +1,111 @@
+/* Test backtrace and backtrace_symbols.
+   Copyright (C) 2009-2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <execinfo.h>
+#include <search.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
+
+/* Set to a non-zero value if the test fails.  */
+int ret;
+
+/* Accesses to X are used to prevent optimization.  */
+volatile int x;
+
+/* Called if the test fails.  */
+#define FAIL() \
+  do { printf ("Failure on line %d\n", __LINE__); ret = 1; } while (0)
+
+/* The backtrace should include at least f1, f2, f3, and do_test.  */
+#define NUM_FUNCTIONS 4
+
+/* Use this attribute to prevent inlining, so that all expected frames
+   are present.  */
+#define NO_INLINE __attribute__ ((noinline))
+
+NO_INLINE void
+fn1 (void)
+{
+  void *addresses[NUM_FUNCTIONS];
+  char **symbols;
+  int n;
+  int i;
+
+  /* Get the backtrace addresses.  */
+  n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
+  printf ("Obtained backtrace with %d functions\n", n);
+  /*  Check that there are at least four functions.  */
+  if (n < NUM_FUNCTIONS)
+    {
+      FAIL ();
+      return;
+    }
+  /* Convert them to symbols.  */
+  symbols = backtrace_symbols (addresses, n);
+  /* Check that symbols were obtained.  */
+  if (symbols == NULL)
+    {
+      FAIL ();
+      return;
+    }
+  for (i = 0; i < n; ++i)
+    printf ("Function %d: %s\n", i, symbols[i]);
+  /* Check that the function names obtained are accurate.  */
+  if (strstr (symbols[0], "fn1") == NULL)
+    {
+      FAIL ();
+      return;
+    }
+  /* Symbol names are not available for static functions, so we do not
+     check f2.  */
+  if (strstr (symbols[2], "fn3") == NULL)
+    {
+      FAIL ();
+      return;
+    }
+  /* Symbol names are not available for static functions, so we do not
+     check do_test.  */
+}
+
+NO_INLINE static int
+fn2 (void)
+{
+  fn1 ();
+  /* Prevent tail calls.  */
+  return x;
+}
+
+NO_INLINE int
+fn3 (void)
+{
+  fn2();
+  /* Prevent tail calls.  */
+  return x;
+}
+
+NO_INLINE static int
+do_test (void)
+{
+  fn3 ();
+  return ret;
+}