[pypy-svn] pypy default: port test_virtual_instance from test_pypy_c

[antocuni]

Author: Antonio Cuni <anto.cuni at gmail.com>
Branch: 
Changeset: r42666:30f0ecace0a1
Date: 2011-03-15 15:56 +0100
http://bitbucket.org/pypy/pypy/changeset/30f0ecace0a1/

Log:	port test_virtual_instance from test_pypy_c

diff --git a/pypy/module/pypyjit/test_pypy_c/test_pypy_c_new.py b/pypy/module/pypyjit/test_pypy_c/test_pypy_c_new.py
--- a/pypy/module/pypyjit/test_pypy_c/test_pypy_c_new.py
+++ b/pypy/module/pypyjit/test_pypy_c/test_pypy_c_new.py
@@ -371,7 +371,6 @@
             guard_no_overflow(descr=<Guard38>)
         """)
 
-
     def test_stararg(self):
         def main(x):
             def g(*args):
@@ -398,6 +397,33 @@
         assert 'new_with_vtable' not in ops
         assert 'call_may_force' not in ops
 
+    def test_virtual_instance(self):
+        def main(n):
+            class A(object):
+                pass
+            #
+            i = 0
+            while i < n:
+                a = A()
+                assert isinstance(a, A)
+                assert not isinstance(a, int)
+                a.x = 2
+                i = i + a.x
+            return i
+        #
+        log = self.run(main, [1000], threshold = 400)
+        assert log.result == 1000
+        loop, = log.loops_by_filename(self.filepath)
+        assert loop.match("""
+            i7 = int_lt(i5, i6)
+            guard_true(i7, descr=<Guard3>)
+            i9 = int_add_ovf(i5, 2)
+            guard_no_overflow(descr=<Guard4>)
+            --TICK--
+            jump(p0, p1, p2, p3, p4, i9, i6, descr=<Loop0>)
+        """)
+
+
     def test_reraise(self):
         def f(n):
             i = 0