[pypy-commit] pypy default: check only once during tracing whether a frame is a nonstandard-virtualizable

[cfbolz]

Author: Carl Friedrich Bolz <cfb...@gmx.de>
Branch: 
Changeset: r45653:72d3b692033c
Date: 2011-07-15 20:19 +0200
http://bitbucket.org/pypy/pypy/changeset/72d3b692033c/

Log:    check only once during tracing whether a frame is a nonstandard-
        virtualizable

diff --git a/pypy/jit/metainterp/pyjitpl.py b/pypy/jit/metainterp/pyjitpl.py
--- a/pypy/jit/metainterp/pyjitpl.py
+++ b/pypy/jit/metainterp/pyjitpl.py
@@ -596,12 +596,16 @@
         standard_box = self.metainterp.virtualizable_boxes[-1]
         if standard_box is box:
             return False
+        if box in self.metainterp.nonstandard_virtualizables:
+            return True
         eqbox = self.metainterp.execute_and_record(rop.PTR_EQ, None,
                                                    box, standard_box)
         eqbox = self.implement_guard_value(pc, eqbox)
         isstandard = eqbox.getint()
         if isstandard:
             self.metainterp.replace_box(box, standard_box)
+        else:
+            self.metainterp.nonstandard_virtualizables[box] = None
         return not isstandard
 
     def _get_virtualizable_field_index(self, fielddescr):
@@ -1456,6 +1460,8 @@
         self.call_pure_results = args_dict_box()
         # contains boxes where the class is already known
         self.known_class_boxes = {}
+        # contains frame boxes that are not virtualizables
+        self.nonstandard_virtualizables = {}
 
     def perform_call(self, jitcode, boxes, greenkey=None):
         # causes the metainterp to enter the given subfunction
@@ -1797,6 +1803,7 @@
 
     def reached_loop_header(self, greenboxes, redboxes, resumedescr):
         self.known_class_boxes = {}
+        self.nonstandard_virtualizables = {} # XXX maybe not needed?
 
         duplicates = {}
         self.remove_consts_and_duplicates(redboxes, len(redboxes),
diff --git a/pypy/jit/metainterp/test/test_virtualizable.py 
b/pypy/jit/metainterp/test/test_virtualizable.py
--- a/pypy/jit/metainterp/test/test_virtualizable.py
+++ b/pypy/jit/metainterp/test/test_virtualizable.py
@@ -1133,6 +1133,7 @@
          res = self.meta_interp(f, [10])
          assert res == 55
          self.check_loops(new_with_vtable=0, ptr_eq=1, everywhere=True)
+         self.check_history(ptr_eq=2)
 
     def test_virtual_child_frame_with_arrays(self):
         myjitdriver = JitDriver(greens = [], reds = ['frame'],
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