# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1298824730 -3600
# Node ID c87bdb84d9d3f32c979396a054ba6cb933ac7ccf
# Parent  4a8dd27c299420de7198020e8e81e8af762ece74
Introduced placeholder functions for print in order to let all tests pass.
Added TestIdentity and status-related optimisation suggestions.

diff -r 4a8dd27c2994 -r c87bdb84d9d3 TO_DO.txt
--- a/TO_DO.txt	Sun Feb 27 02:45:38 2011 +0100
+++ b/TO_DO.txt	Sun Feb 27 17:38:50 2011 +0100
@@ -1,22 +1,3 @@
-Permit __class__ as being differently defined for classes and instances. Since __class__
-is always defined, no shadowing may occur for the attribute exposing it at different
-levels.
-
-  The instance definition of __class__ should be stored in the object table.
-
-  Each common definition for instances of a class shall be stored as the first
-  attribute of each class.
-
-  Access to __class__ has to be detected and a special instruction (sequence)
-  generated to handle the class/instance logic.
-
-  The type class should be exposed as each class's __class__ attribute.
-
-  Note that object table information will not be able to reflect the class-type
-  relationship, but isinstance will need to check for instances and classes, anyway.
-
-Tuple references to stack locations in a merged stack/heap memory model.
-
 Attribute Usage
 ===============
 
@@ -111,3 +92,12 @@
 __getitem__ could be written in Python, using a native method only to access fragments.
 
 Consider better "macro" support where new expressions need to be generated and processed.
+
+Detect TestIdentity results involving constants, potentially optimising status-affected
+instructions:
+
+  TestIdentity(x, y) # where x is always y
+  JumpIfFalse(...)   # would be removed (never false)
+  JumpIfTrue(...)    # changed to Jump(...)
+
+Status-affected blocks could be optimised away for such constant-related results.
diff -r 4a8dd27c2994 -r c87bdb84d9d3 rsvplib.py
--- a/rsvplib.py	Sun Feb 27 02:45:38 2011 +0100
+++ b/rsvplib.py	Sun Feb 27 17:38:50 2011 +0100
@@ -445,6 +445,14 @@
         else:
             self.machine.result = DataValue(self.constants[False], self.constants[False])
 
+    def builtins_print(self):
+        # NOTE: Do nothing for now.
+        pass
+
+    def builtins_printnl(self):
+        # NOTE: Do nothing for now.
+        pass
+
     native_functions = {
 
         # Native method implementations:
@@ -491,6 +499,8 @@
         # Native helper functions:
 
         "__builtins__._isinstance" : builtins_isinstance,
+        "__builtins__._print" : builtins_print,
+        "__builtins__._printnl" : builtins_printnl,
         }
 
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