Add DTrace probes

Objects/frameobject.c

 /* Frame object implementation */
 
 #include "Python.h"
 
 #include "code.h"
 #include "frameobject.h"
 #include "opcode.h"
 #include "structmember.h"
 
 #undef MIN
@@ skipping 696 matching lines @@
             locals = globals;
         Py_INCREF(locals);
         f->f_locals = locals;
     }
     f->f_tstate = tstate;
 
     f->f_lasti = -1;
     f->f_lineno = code->co_firstlineno;
     f->f_iblock = 0;
 
+#ifdef WITH_DTRACE
+    /*
+    ** Cache UTF8 internally, available
+    ** for the pythonframe stack walker.
+    */
+    PyUnicode_AsUTF8(f->f_code->co_filename);
+    PyUnicode_AsUTF8(f->f_code->co_name);
+#endif
+
     _PyObject_GC_TRACK(f);
     return f;
 }
 
 /* Block management */
 
 void
 PyFrame_BlockSetup(PyFrameObject *f, int type, int handler, int level)
 {
     PyTryBlock *b;
@@ skipping 231 matching lines @@
 
 /* Print summary info about the state of the optimized allocator */
 void
 _PyFrame_DebugMallocStats(FILE *out)
 {
     _PyDebugAllocatorStats(out,
                            "free PyFrameObject",
                            numfree, sizeof(PyFrameObject));
 }