ppc stackwalker (#30). r=bryner

- Implementation of PowerPC stackwalker.  Tested using stackwalker_selftest
   (#18).
 - Hook up processor-side multi-CPU support in MinidumpProcessor and
   minidump_stackwalk using the new Stackwalker::StackwalkerForCPU method.

http://groups.google.com/group/airbag-dev/browse_thread/thread/1c2fa7c5182a77a9


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@34 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/minidump_processor.cc

@@ -27,10 +27,14 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include <memory>
+
 #include "google/minidump_processor.h"
 #include "processor/minidump.h"
 #include "processor/stackwalker_x86.h"
 
+using std::auto_ptr;
+
 namespace google_airbag {
 
 MinidumpProcessor::MinidumpProcessor(SymbolSupplier *supplier)
@@ -68,10 +72,14 @@ bool MinidumpProcessor::Process(const string &minidump_file,
     return false;
   }
 
-  // TODO(bryner): figure out which StackWalker we want
-  StackwalkerX86 walker(exception->GetContext(), thread_memory,
-                        dump.GetModuleList(), supplier_);
-  walker.Walk(stack_frames);
+  auto_ptr<Stackwalker> walker(
+    Stackwalker::StackwalkerForCPU(exception->GetContext(), thread_memory,
+                                   dump.GetModuleList(), supplier_));
+  if (!walker.get()) {
+    return false;
+  }
+
+  walker->Walk(stack_frames);
   return true;
 }