Test utility to look for bad stacksize calculations.

Tools/compiler/stacktest.py

+import compiler
+import dis
+import types
+
+def extract_code_objects(co):
+    l = [co]
+    for const in co.co_consts:
+        if type(const) == types.CodeType:
+            l.append(const)
+    return l
+
+def compare(a, b):
+    if not (a.co_name == "?" or a.co_name.startswith('<lambda')):
+        assert a.co_name == b.co_name, (a, b)
+    if a.co_stacksize != b.co_stacksize:
+        print "stack mismatch %s: %d vs. %d" % (a.co_name,
+                                                a.co_stacksize,
+                                                b.co_stacksize)
+        if a.co_stacksize > b.co_stacksize:
+            print "good code"
+            dis.dis(a)
+            print "bad code"
+            dis.dis(b)
+            assert 0
+
+def main(files):
+    for file in files:
+        print file
+        buf = open(file).read()
+        try:
+            co1 = compile(buf, file, "exec")
+        except SyntaxError:
+            print "skipped"
+            continue
+        co2 = compiler.compile(buf, file, "exec")
+        co1l = extract_code_objects(co1)
+        co2l = extract_code_objects(co2)
+        for a, b in zip(co1l, co2l):
+            compare(a, b)
+
+if __name__ == "__main__":
+    import sys
+    main(sys.argv[1:])