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/stackwalker_x86.h

@@ -43,10 +43,8 @@
 #include "processor/stackwalker.h"
 #include "processor/minidump_format.h"
 
-
 namespace google_airbag {
 
-
 class MinidumpContext;
 class MinidumpModuleList;
 
@@ -57,24 +55,21 @@ class StackwalkerX86 : public Stackwalker {
   // register state corresponding to the innermost called frame to be
   // included in the stack.  The other arguments are passed directly through
   // to the base Stackwalker constructor.
-  StackwalkerX86(MinidumpContext*    context,
-                 MemoryRegion*       memory,
-                 MinidumpModuleList* modules,
-                 SymbolSupplier*     supplier);
+  StackwalkerX86(const MDRawContextX86 *context,
+                 MemoryRegion *memory,
+                 MinidumpModuleList *modules,
+                 SymbolSupplier *supplier);
 
  private:
   // Implementation of Stackwalker, using x86 context (%ebp, %eip) and
   // stack conventions (saved %ebp at [%ebp], saved %eip at 4[%ebp]).
-  virtual bool GetContextFrame(StackFrame* frame);
-  virtual bool GetCallerFrame(StackFrame* frame);
+  virtual bool GetContextFrame(StackFrame *frame);
+  virtual bool GetCallerFrame(StackFrame *frame,
+                              const StackFrames *walked_frames);
 
   // Stores the CPU context corresponding to the innermost stack frame to
   // be returned by GetContextFrame.
-  const MDRawContextX86* context_;
-
-  // Stores the frame pointer returned in the last stack frame returned by
-  // GetContextFrame or GetCallerFrame.
-  u_int32_t              last_frame_pointer_;
+  const MDRawContextX86 *context_;
 };