GCC compatibility on x86 for C++ exception handling

src/unwind/SetGR.c

@@ -24,11 +24,17 @@ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 
 #include "unwind-internal.h"
+#ifdef UNW_TARGET_X86
+#include "dwarf_i.h"
+#endif
 
 PROTECTED void
 _Unwind_SetGR (struct _Unwind_Context *context, int index,
 	       unsigned long new_value)
 {
+#ifdef UNW_TARGET_X86
+  index = dwarf_to_unw_regnum(index);
+#endif
   unw_set_reg (&context->cursor, index, new_value);
 #ifdef UNW_TARGET_IA64
   if (index >= UNW_IA64_GR && index <= UNW_IA64_GR + 127)

tests/Ltest-cxx-exceptions.cxx

@@ -0,0 +1,78 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2010 stefan.demharter@gmx.net
+   Copyright (C) 2010 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 <libunwind.h>
+
+#define panic(args...)				\
+	{ fprintf (stderr, args); exit (-1); }
+
+struct Test
+{
+  public: // --- ctor/dtor ---
+    Test() { ++counter_; }
+    ~Test() { -- counter_; }
+    Test(const Test&) { ++counter_; }
+
+  public: // --- static members ---
+    static int counter_;
+};
+
+int Test::counter_ = 0;
+
+// Called by foo
+extern "C" void bar()
+{
+  Test t;
+  try {
+    Test t;
+    throw 5;
+  } catch (...) {
+    Test t;
+    printf("Throwing an int\n");
+    throw 6;
+  }
+}
+
+int main()
+{
+  try {
+    Test t;
+    bar();
+  } catch (int) {
+    // Dtor of all Test-object has to be called.
+    if (Test::counter_ != 0)
+      panic("Counter non-zero\n");
+    return Test::counter_;
+  } catch (...) {
+    // An int was thrown - we should not get here.
+    panic("Int was thrown why are we here?\n");
+  }
+  exit(0);
+}

tests/Makefile.am

@@ -45,6 +45,10 @@ endif #ARCH_IA64
  noinst_PROGRAMS_cdep = forker mapper test-ptrace-misc test-varargs	\
 			Gperf-simple Lperf-simple
 
+if SUPPORT_CXX_EXCEPTIONS
+ check_PROGRAMS_cdep += Ltest-cxx-exceptions
+endif
+
 perf: perf-startup Gperf-simple Lperf-simple
 	@echo "########## Basic performance of generic libunwind:"
 	@./Gperf-simple
@@ -81,6 +85,8 @@ ppc64_test_altivec_SOURCES = ppc64-test-altivec.c  ppc64-test-altivec-utils.c
 ppc64_test_wchar_SOURCES = ppc64-test-wchar.c
 Gtest_init_SOURCES = Gtest-init.cxx
 Ltest_init_SOURCES = Ltest-init.cxx
+Ltest_cxx_exceptions_SOURCES = Ltest-cxx-exceptions.cxx
+
 Gtest_dyn1_SOURCES = Gtest-dyn1.c flush-cache.S
 Ltest_dyn1_SOURCES = Ltest-dyn1.c flush-cache.S
 test_static_link_SOURCES = test-static-link-loc.c test-static-link-gen.c