Author: Ronan Lamy <ronan.l...@gmail.com>
Branch: less-stringly-ops
Changeset: r66227:2e539dd83216
Date: 2013-08-08 21:14 +0100
http://bitbucket.org/pypy/pypy/changeset/2e539dd83216/
Log: Create a decorator to register flowspace special-cases
diff --git a/rpython/flowspace/specialcase.py b/rpython/flowspace/specialcase.py
--- a/rpython/flowspace/specialcase.py
+++ b/rpython/flowspace/specialcase.py
@@ -1,8 +1,22 @@
from rpython.flowspace.model import Constant
-from rpython.flowspace.operation import func2op, op
+from rpython.flowspace.operation import func2op
from rpython.rlib.rarithmetic import r_uint
from rpython.rlib.objectmodel import we_are_translated
+SPECIAL_CASES = {}
+
+def register_flow_sc(func):
+ """Decorator triggering special-case handling of ``func``.
+
+ When the flow graph builder sees ``func``, it calls the decorated function
+ with ``decorated_func(space, *args_w)``, where ``args_w`` is a sequence of
+ flow objects (Constants or Variables).
+ """
+ def decorate(sc_func):
+ SPECIAL_CASES[func] = sc_func
+ return decorate
+
+@register_flow_sc(__import__)
def sc_import(space, args_w):
assert len(args_w) > 0 and len(args_w) <= 5, 'import needs 1 to 5
arguments'
args = [space.unwrap(arg) for arg in args_w]
@@ -33,6 +47,7 @@
# _________________________________________________________________________
+@register_flow_sc(r_uint)
def sc_r_uint(space, args_w):
# special case to constant-fold r_uint(32-bit-constant)
# (normally, the 32-bit constant is a long, and is not allowed to
@@ -42,9 +57,11 @@
return Constant(r_uint(w_value.value))
return space.frame.do_operation('simple_call', space.wrap(r_uint), w_value)
+@register_flow_sc(we_are_translated)
def sc_we_are_translated(space, args_w):
return Constant(True)
+@register_flow_sc(locals)
def sc_locals(space, args):
raise Exception(
"A function calling locals() is not RPython. "
@@ -54,8 +71,5 @@
"pytest.ini from the root of the PyPy repository into your "
"own project.")
-SPECIAL_CASES = {__import__: sc_import, r_uint: sc_r_uint,
- we_are_translated: sc_we_are_translated,
- locals: sc_locals}
for fn, oper in func2op.items():
- SPECIAL_CASES[fn] = oper.make_sc()
+ register_flow_sc(fn)(oper.make_sc())
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