1 files changed, 13 insertions, 1 deletions
diff --git a/src/processor/stackwalker_arm.h b/src/processor/stackwalker_arm.h
index 5dfde5ab..3768cc2c 100644
--- a/src/processor/stackwalker_arm.h
+++ b/src/processor/stackwalker_arm.h
@@ -1,3 +1,5 @@
+// -*- mode: C++ -*-
+
 // Copyright (c) 2010 Google Inc.
 // All rights reserved.
 //
@@ -60,15 +62,25 @@ class StackwalkerARM : public Stackwalker {
                  SymbolSupplier *supplier,
                  SourceLineResolverInterface *resolver);
 
+  // Change the context validity mask of the frame returned by
+  // GetContextFrame to VALID. This is only for use by unit tests; the
+  // default behavior is correct for all application code.
+  void SetContextFrameValidity(int valid) { context_frame_validity_ = valid; }
+
  private:
   // Implementation of Stackwalker, using arm context and stack conventions.
   // TODO: currently stubbed out, needs CFI symbol dumper support
   virtual StackFrame* GetContextFrame();
   virtual StackFrame* GetCallerFrame(const CallStack *stack);
 
-  // Stores the CPU context corresponding to the innermost stack frame to
+  // Stores the CPU context corresponding to the youngest stack frame, to
   // be returned by GetContextFrame.
   const MDRawContextARM *context_;
+
+  // Validity mask for youngest stack frame. This is always
+  // CONTEXT_VALID_ALL in real use; it is only changeable for the sake of
+  // unit tests.
+  int context_frame_validity_;
 };