Verify that we don't call malloc when unwinding locally.

tests/Gtest-nomalloc.c

@@ -0,0 +1,114 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2009 Google, Inc
+	Contributed by Arun Sharma <arun.sharma@google.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <libunwind.h>
+
+#define panic(args...)				\
+	{ fprintf (stderr, args); exit (-1); }
+
+int verbose;
+int num_errors;
+int in_unwind;
+
+void *
+malloc(size_t s)
+{
+  static void * (*func)();
+
+  if(!func)
+    func = (void *(*)()) dlsym(RTLD_NEXT, "malloc");
+
+  if (in_unwind) {
+    num_errors++;
+    return NULL;
+  } else {
+    return func(s);
+  }
+}
+
+static void
+do_backtrace (void)
+{
+  unw_word_t ip, sp;
+  unw_cursor_t cursor;
+  unw_context_t uc;
+  int ret;
+
+  in_unwind = 1;
+  unw_getcontext (&uc);
+  if (unw_init_local (&cursor, &uc) < 0)
+    panic ("unw_init_local failed!\n");
+
+  do
+    {
+      unw_get_reg (&cursor, UNW_REG_IP, &ip);
+      unw_get_reg (&cursor, UNW_REG_SP, &sp);
+
+      ret = unw_step (&cursor);
+      if (ret < 0)
+	{
+	  ++num_errors;
+	}
+    }
+  while (ret > 0);
+  in_unwind = 0;
+}
+
+void
+foo3 ()
+{
+  do_backtrace ();
+}
+
+void
+foo2 ()
+{
+  foo3 ();
+}
+
+void
+foo1 ()
+{
+  foo2 ();
+}
+
+int
+main (int argc, char **argv)
+{
+  foo1();
+
+  if (num_errors > 0)
+    {
+      fprintf (stderr, "FAILURE: detected %d errors\n", num_errors);
+      exit (-1);
+    }
+  return 0;
+}

tests/Ltest-nomalloc.c

@@ -0,0 +1,5 @@
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#if !defined(UNW_REMOTE_ONLY)
+#include "Gtest-nomalloc.c"
+#endif

tests/Makefile.am

@@ -40,7 +40,8 @@ endif #ARCH_IA64
 			Gtest-resume-sig Ltest-resume-sig		 \
 			Gtest-dyn1 Ltest-dyn1				 \
 			test-async-sig test-flush-cache test-init-remote \
-			test-mem test-setjmp test-ptrace
+			test-mem test-setjmp test-ptrace		 \
+			Ltest-nomalloc
  noinst_PROGRAMS_cdep = forker mapper test-ptrace-misc test-varargs	\
 			Gperf-simple Lperf-simple
 
@@ -98,3 +99,7 @@ test_ptrace_LDADD = ../src/libunwind-ptrace.a $(LIBUNWIND)
 Ltest_concurrent_LDADD = $(LIBUNWIND) -lpthread
 Gtest_concurrent_LDADD = $(LIBUNWIND) -lpthread
 test_async_sig_LDADD = $(LIBUNWIND) -lpthread
+
+LDADD += -ldl
+Ltest_nomalloc_SOURCES = Ltest-nomalloc.c
+