Add two utility functions:

    o get_parent_frame(frame)
    o get_args_as_string(frame)

to lldbutil.py and create TestFrameUtils.py to exercise the utils.
Plus re-arrange the test/python_api/lldbutil to have three directories
for testing iteration, process stack traces, and the just added frame utils.

llvm-svn: 131213
diff --git a/lldb/test/python_api/lldbutil/frame/TestFrameUtils.py b/lldb/test/python_api/lldbutil/frame/TestFrameUtils.py
new file mode 100644
index 0000000..cd4ba09
--- /dev/null
+++ b/lldb/test/python_api/lldbutil/frame/TestFrameUtils.py
@@ -0,0 +1,62 @@
+"""
+Test utility functions for the frame object.
+"""
+
+import os
+import unittest2
+import lldb
+from lldbtest import *
+
+class FrameUtilsTestCase(TestBase):
+
+    mydir = "python_api/lldbutil/frame"
+
+    def setUp(self):
+        # Call super's setUp().
+        TestBase.setUp(self)
+        # Find the line number to break inside main().
+        self.line = line_number('main.c',
+                                "// Find the line number here.")
+
+    def test_frame_utils(self):
+        """Test utility functions for the frame object."""
+        self.buildDefault(dictionary={'C_SOURCES': 'main.c'})
+        self.frame_utils()
+
+    def frame_utils(self):
+        exe = os.path.join(os.getcwd(), "a.out")
+
+        target = self.dbg.CreateTarget(exe)
+        self.assertTrue(target.IsValid(), VALID_TARGET)
+
+        breakpoint = target.BreakpointCreateByLocation("main.c", self.line)
+        self.assertTrue(breakpoint.IsValid(), VALID_BREAKPOINT)
+
+        # Now launch the process, and do not stop at entry point.
+        self.process = target.LaunchSimple(None, None, os.getcwd())
+
+        if not self.process.IsValid():
+            self.fail("SBTarget.LaunchProcess() failed")
+        self.assertTrue(self.process.GetState() == lldb.eStateStopped,
+                        PROCESS_STOPPED)
+
+        import lldbutil
+        thread = lldbutil.get_stopped_thread(self.process, lldb.eStopReasonBreakpoint)
+        frame0 = thread.GetFrameAtIndex(0)
+        frame1 = thread.GetFrameAtIndex(1)
+        parent = lldbutil.get_parent_frame(frame0)
+        self.assertTrue(parent.IsValid() and parent.GetFrameID() == frame1.GetFrameID())
+        frame0_args = lldbutil.get_args_as_string(frame0)
+        parent_args = lldbutil.get_args_as_string(parent)
+        self.assertTrue(frame0_args and parent_args)
+        if self.TraceOn():
+            lldbutil.print_stacktrace(thread)
+            print "Current frame: %s" % frame0_args
+            print "Parent frame: %s" % parent_args
+
+
+if __name__ == '__main__':
+    import atexit
+    lldb.SBDebugger.Initialize()
+    atexit.register(lambda: lldb.SBDebugger.Terminate())
+    unittest2.main()