[pypy-svn] r17652 - pypy/dist/pypy/translator/backendopt

[ericvrp at codespeak.net]

Author: ericvrp
Date: Mon Sep 19 11:39:49 2005
New Revision: 17652

Added:
   pypy/dist/pypy/translator/backendopt/exception.py
Log:
Work in progress.
Checking this in because I'm moving to another machine


Added: pypy/dist/pypy/translator/backendopt/exception.py
==============================================================================
--- (empty file)
+++ pypy/dist/pypy/translator/backendopt/exception.py	Mon Sep 19 11:39:49 2005
@@ -0,0 +1,17 @@
+from pypy.translator.unsimplify import split_block
+from pypy.objspace.flow.model import Block, flatten
+
+
+def create_exception_handling(translator, graph):
+    """After an exception in a direct_call, that is not catched by an explicit
+    except statement, we need to reraise the exception. So after this
+    direct_call we need to test if an exception had occurred. If so, we return
+    from the current graph with an unused value (false/0/0.0/null).
+    Because of the added exitswitch we need an additional block.
+    """
+    blocks = [x for x in flatten(graph) if isinstance(x, Block)]
+    for block in blocks:
+        for i in range(len(block.operations)-1, -1, -1):
+            op = block.operations[i]
+            if op.opname == 'direct_call':
+                split_block(translator, graph, block, i)