Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r48190:81e9199c50b9
Date: 2011-10-18 10:21 +0200
http://bitbucket.org/pypy/pypy/changeset/81e9199c50b9/
Log: Add debugging support for @elidable decorators. Disabled by default
because it keeps all arguments ever passed alive.
diff --git a/pypy/rlib/jit.py b/pypy/rlib/jit.py
--- a/pypy/rlib/jit.py
+++ b/pypy/rlib/jit.py
@@ -8,6 +8,8 @@
from pypy.rpython.extregistry import ExtRegistryEntry
from pypy.tool.sourcetools import func_with_new_name
+DEBUG_ELIDABLE_FUNCTIONS = False
+
def elidable(func):
""" Decorate a function as "trace-elidable". This means precisely that:
@@ -24,6 +26,18 @@
If a particular call to this function ends up raising an exception, then it
is handled like a normal function call (this decorator is ignored).
"""
+ if DEBUG_ELIDABLE_FUNCTIONS:
+ cache = {}
+ oldfunc = func
+ def func(*args):
+ result = oldfunc(*args) # if it raises, no caching
+ try:
+ oldresult = cache.setdefault(args, result)
+ except TypeError:
+ pass # unhashable args
+ else:
+ assert oldresult == result
+ return result
func._elidable_function_ = True
return func
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