[pypy-svn] r77265 - in pypy/trunk/pypy: jit/backend/cli jit/backend/llgraph jit/backend/llsupport jit/backend/llsupport/test jit/backend/llvm jit/backend/test jit/backend/x86 jit/backend/x86/test jit/metainterp jit/metainterp/optimizeopt jit/metainterp/test jit/tool module/array/benchmark module/array/test

antocuni at codespeak.net antocuni at codespeak.net
Wed Sep 22 14:17:19 CEST 2010


Author: antocuni
Date: Wed Sep 22 14:17:16 2010
New Revision: 77265

Added:
   pypy/trunk/pypy/jit/metainterp/test/test_resoperation.py
      - copied unchanged from r77260, pypy/branch/resoperation-refactoring/pypy/jit/metainterp/test/test_resoperation.py
Modified:
   pypy/trunk/pypy/jit/backend/cli/method.py
   pypy/trunk/pypy/jit/backend/cli/runner.py
   pypy/trunk/pypy/jit/backend/llgraph/runner.py
   pypy/trunk/pypy/jit/backend/llsupport/gc.py
   pypy/trunk/pypy/jit/backend/llsupport/regalloc.py
   pypy/trunk/pypy/jit/backend/llsupport/test/test_gc.py
   pypy/trunk/pypy/jit/backend/llvm/compile.py
   pypy/trunk/pypy/jit/backend/test/runner_test.py
   pypy/trunk/pypy/jit/backend/test/test_ll_random.py
   pypy/trunk/pypy/jit/backend/test/test_random.py
   pypy/trunk/pypy/jit/backend/x86/assembler.py
   pypy/trunk/pypy/jit/backend/x86/regalloc.py
   pypy/trunk/pypy/jit/backend/x86/test/test_recompilation.py
   pypy/trunk/pypy/jit/backend/x86/test/test_regalloc.py
   pypy/trunk/pypy/jit/backend/x86/test/test_runner.py
   pypy/trunk/pypy/jit/metainterp/compile.py
   pypy/trunk/pypy/jit/metainterp/graphpage.py
   pypy/trunk/pypy/jit/metainterp/history.py
   pypy/trunk/pypy/jit/metainterp/logger.py
   pypy/trunk/pypy/jit/metainterp/optimize.py
   pypy/trunk/pypy/jit/metainterp/optimizefindnode.py
   pypy/trunk/pypy/jit/metainterp/optimizeopt/heap.py
   pypy/trunk/pypy/jit/metainterp/optimizeopt/intbounds.py
   pypy/trunk/pypy/jit/metainterp/optimizeopt/optimizer.py   (contents, props changed)
   pypy/trunk/pypy/jit/metainterp/optimizeopt/rewrite.py
   pypy/trunk/pypy/jit/metainterp/optimizeopt/virtualize.py
   pypy/trunk/pypy/jit/metainterp/pyjitpl.py
   pypy/trunk/pypy/jit/metainterp/resoperation.py
   pypy/trunk/pypy/jit/metainterp/simple_optimize.py
   pypy/trunk/pypy/jit/metainterp/test/oparser.py
   pypy/trunk/pypy/jit/metainterp/test/test_basic.py
   pypy/trunk/pypy/jit/metainterp/test/test_logger.py
   pypy/trunk/pypy/jit/metainterp/test/test_loop.py
   pypy/trunk/pypy/jit/metainterp/test/test_oparser.py
   pypy/trunk/pypy/jit/metainterp/test/test_optimizeopt.py
   pypy/trunk/pypy/jit/metainterp/test/test_recursive.py
   pypy/trunk/pypy/jit/metainterp/test/test_virtualref.py
   pypy/trunk/pypy/jit/tool/showstats.py
   pypy/trunk/pypy/module/array/benchmark/Makefile   (props changed)
   pypy/trunk/pypy/module/array/benchmark/intimg.c   (props changed)
   pypy/trunk/pypy/module/array/benchmark/intimgtst.c   (props changed)
   pypy/trunk/pypy/module/array/benchmark/intimgtst.py   (props changed)
   pypy/trunk/pypy/module/array/benchmark/loop.c   (props changed)
   pypy/trunk/pypy/module/array/benchmark/sum.c   (props changed)
   pypy/trunk/pypy/module/array/benchmark/sumtst.c   (props changed)
   pypy/trunk/pypy/module/array/benchmark/sumtst.py   (props changed)
   pypy/trunk/pypy/module/array/test/test_array_old.py   (props changed)
Log:
Merge the resoperation-refactoring branch.

The idea is to reduce the memory needed by ResOperations, by putting certain
fields (e.g. a variable-sized list of arguments, or descr, or fail_args) only
on the operations that actually need them.

The benchmarks don't show any speedup or slowdown, but it's still worth
merging because it saves a bit of memory: list of operations are thrown away
immediately right now, but we might want to keep them in the future.



Modified: pypy/trunk/pypy/jit/backend/cli/method.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/cli/method.py	(original)
+++ pypy/trunk/pypy/jit/backend/cli/method.py	Wed Sep 22 14:17:16 2010
@@ -207,9 +207,9 @@
 
     def _collect_types(self, operations, box2classes):
         for op in operations:
-            if op.opnum in (rop.GETFIELD_GC, rop.SETFIELD_GC):
+            if op.getopnum() in (rop.GETFIELD_GC, rop.SETFIELD_GC):
                 box = op.args[0]
-                descr = op.descr
+                descr = op.getdescr()
                 assert isinstance(descr, runner.FieldDescr)
                 box2classes.setdefault(box, []).append(descr.selfclass)
             if op in self.cliloop.guard2ops:
@@ -335,7 +335,7 @@
         while self.i < N:
             op = oplist[self.i]
             self.emit_debug(op.repr())
-            func = self.operations[op.opnum]
+            func = self.operations[op.getopnum()]
             assert func is not None
             func(self, op)
             self.i += 1
@@ -357,10 +357,10 @@
         assert op.is_guard()
         if op in self.cliloop.guard2ops:
             inputargs, suboperations = self.cliloop.guard2ops[op]
-            self.match_var_fox_boxes(op.fail_args, inputargs)
+            self.match_var_fox_boxes(op.getfailargs(), inputargs)
             self.emit_operations(suboperations)
         else:
-            self.emit_return_failed_op(op, op.fail_args)
+            self.emit_return_failed_op(op, op.getfailargs())
 
     def emit_end(self):
         assert self.branches == []
@@ -410,7 +410,7 @@
 
     def emit_ovf_op(self, op, emit_op):
         next_op = self.oplist[self.i+1]
-        if next_op.opnum == rop.GUARD_NO_OVERFLOW:
+        if next_op.getopnum() == rop.GUARD_NO_OVERFLOW:
                 self.i += 1
                 self.emit_ovf_op_and_guard(op, next_op, emit_op)
                 return
@@ -544,7 +544,7 @@
         self.emit_guard_overflow_impl(op, OpCodes.Brfalse)
 
     def emit_op_jump(self, op):
-        target_token = op.descr
+        target_token = op.getdescr()
         assert isinstance(target_token, LoopToken)
         if target_token.cliloop is self.cliloop:
             # jump to the beginning of the loop
@@ -586,7 +586,7 @@
         self.store_result(op)
 
     def emit_op_instanceof(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.TypeDescr)
         clitype = descr.get_clitype()
         op.args[0].load(self)
@@ -604,7 +604,7 @@
         self.store_result(op)
 
     def emit_op_call_impl(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.StaticMethDescr)
         delegate_type = descr.get_delegate_clitype()
         meth_invoke = descr.get_meth_info()
@@ -619,7 +619,7 @@
     emit_op_call_pure = emit_op_call
 
     def emit_op_oosend(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.MethDescr)
         clitype = descr.get_self_clitype()
         methinfo = descr.get_meth_info()
@@ -639,7 +639,7 @@
             self.store_result(op)
 
     def emit_op_getfield_gc(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.FieldDescr)
         clitype = descr.get_self_clitype()
         fieldinfo = descr.get_field_info()
@@ -653,7 +653,7 @@
     emit_op_getfield_gc_pure = emit_op_getfield_gc
 
     def emit_op_setfield_gc(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.FieldDescr)
         clitype = descr.get_self_clitype()
         fieldinfo = descr.get_field_info()
@@ -665,7 +665,7 @@
         self.il.Emit(OpCodes.Stfld, fieldinfo)
 
     def emit_op_getarrayitem_gc(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.TypeDescr)
         clitype = descr.get_array_clitype()
         itemtype = descr.get_clitype()
@@ -678,7 +678,7 @@
     emit_op_getarrayitem_gc_pure = emit_op_getarrayitem_gc
 
     def emit_op_setarrayitem_gc(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.TypeDescr)
         clitype = descr.get_array_clitype()
         itemtype = descr.get_clitype()
@@ -689,7 +689,7 @@
         self.il.Emit(OpCodes.Stelem, itemtype)
 
     def emit_op_arraylen_gc(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.TypeDescr)
         clitype = descr.get_array_clitype()
         op.args[0].load(self)
@@ -698,7 +698,7 @@
         self.store_result(op)
 
     def emit_op_new_array(self, op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, runner.TypeDescr)
         item_clitype = descr.get_clitype()
         if item_clitype is None:

Modified: pypy/trunk/pypy/jit/backend/cli/runner.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/cli/runner.py	(original)
+++ pypy/trunk/pypy/jit/backend/cli/runner.py	Wed Sep 22 14:17:16 2010
@@ -105,7 +105,7 @@
     def _attach_token_to_faildescrs(self, token, operations):
         for op in operations:
             if op.is_guard():
-                descr = op.descr
+                descr = op.getdescr()
                 assert isinstance(descr, AbstractFailDescr)
                 descr._loop_token = token
                 descr._guard_op = op
@@ -136,7 +136,7 @@
         func = cliloop.funcbox.holder.GetFunc()
         func(self.get_inputargs())
         op = self.failing_ops[self.inputargs.get_failed_op()]
-        return op.descr
+        return op.getdescr()
         
     def set_future_value_int(self, index, intvalue):
         self.get_inputargs().set_int(index, intvalue)

Modified: pypy/trunk/pypy/jit/backend/llgraph/runner.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/llgraph/runner.py	(original)
+++ pypy/trunk/pypy/jit/backend/llgraph/runner.py	Wed Sep 22 14:17:16 2010
@@ -151,16 +151,17 @@
 
     def _compile_operations(self, c, operations, var2index):
         for op in operations:
-            llimpl.compile_add(c, op.opnum)
-            descr = op.descr
+            llimpl.compile_add(c, op.getopnum())
+            descr = op.getdescr()
             if isinstance(descr, Descr):
                 llimpl.compile_add_descr(c, descr.ofs, descr.typeinfo)
-            if isinstance(descr, history.LoopToken) and op.opnum != rop.JUMP:
+            if isinstance(descr, history.LoopToken) and op.getopnum() != rop.JUMP:
                 llimpl.compile_add_loop_token(c, descr)
             if self.is_oo and isinstance(descr, (OODescr, MethDescr)):
                 # hack hack, not rpython
-                c._obj.externalobj.operations[-1].descr = descr
-            for x in op.args:
+                c._obj.externalobj.operations[-1].setdescr(descr)
+            for i in range(op.numargs()):
+                x = op.getarg(i)
                 if isinstance(x, history.Box):
                     llimpl.compile_add_var(c, var2index[x])
                 elif isinstance(x, history.ConstInt):
@@ -173,10 +174,10 @@
                     raise Exception("'%s' args contain: %r" % (op.getopname(),
                                                                x))
             if op.is_guard():
-                faildescr = op.descr
+                faildescr = op.getdescr()
                 assert isinstance(faildescr, history.AbstractFailDescr)
                 faildescr._fail_args_types = []
-                for box in op.fail_args:
+                for box in op.getfailargs():
                     if box is None:
                         type = history.HOLE
                     else:
@@ -185,7 +186,7 @@
                 fail_index = self.get_fail_descr_number(faildescr)
                 index = llimpl.compile_add_fail(c, fail_index)
                 faildescr._compiled_fail = c, index
-                for box in op.fail_args:
+                for box in op.getfailargs():
                     if box is not None:
                         llimpl.compile_add_fail_arg(c, var2index[box])
                     else:
@@ -203,13 +204,13 @@
                                                                x))
         op = operations[-1]
         assert op.is_final()
-        if op.opnum == rop.JUMP:
-            targettoken = op.descr
+        if op.getopnum() == rop.JUMP:
+            targettoken = op.getdescr()
             assert isinstance(targettoken, history.LoopToken)
             compiled_version = targettoken._llgraph_compiled_version
             llimpl.compile_add_jump_target(c, compiled_version)
-        elif op.opnum == rop.FINISH:
-            faildescr = op.descr
+        elif op.getopnum() == rop.FINISH:
+            faildescr = op.getdescr()
             index = self.get_fail_descr_number(faildescr)
             llimpl.compile_add_fail(c, index)
         else:
@@ -280,7 +281,7 @@
     def __init__(self, *args, **kwds):
         BaseCPU.__init__(self, *args, **kwds)
         self.fielddescrof_vtable = self.fielddescrof(rclass.OBJECT, 'typeptr')
-        
+
     def fielddescrof(self, S, fieldname):
         ofs, size = symbolic.get_field_token(S, fieldname)
         token = history.getkind(getattr(S, fieldname))
@@ -504,7 +505,7 @@
             return ootype.cast_to_object(e)
         else:
             return ootype.NULL
-        
+
     def get_exc_value(self):
         if llimpl._last_exception:
             earg = llimpl._last_exception.args[1]
@@ -580,7 +581,7 @@
         x = descr.callmeth(selfbox, argboxes)
         # XXX: return None if METH.RESULT is Void
         return x
-    
+
 
 def make_getargs(ARGS):
     argsiter = unrolling_iterable(ARGS)
@@ -612,7 +613,7 @@
 class KeyManager(object):
     """
     Helper class to convert arbitrary dictionary keys to integers.
-    """    
+    """
 
     def __init__(self):
         self.keys = {}
@@ -695,7 +696,7 @@
         self.ARRAY = ARRAY = ootype.Array(TYPE)
         def create():
             return boxresult(TYPE, ootype.new(TYPE))
-        
+
         def create_array(lengthbox):
             n = lengthbox.getint()
             return boxresult(ARRAY, ootype.oonewarray(ARRAY, n))
@@ -757,7 +758,7 @@
             obj = objbox.getref(TYPE)
             value = unwrap(T, valuebox)
             setattr(obj, fieldname, value)
-            
+
         self.getfield = getfield
         self.setfield = setfield
         self._is_pointer_field = (history.getkind(T) == 'ref')

Modified: pypy/trunk/pypy/jit/backend/llsupport/gc.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/llsupport/gc.py	(original)
+++ pypy/trunk/pypy/jit/backend/llsupport/gc.py	Wed Sep 22 14:17:16 2010
@@ -559,12 +559,12 @@
         #
         newops = []
         for op in operations:
-            if op.opnum == rop.DEBUG_MERGE_POINT:
+            if op.getopnum() == rop.DEBUG_MERGE_POINT:
                 continue
             # ---------- replace ConstPtrs with GETFIELD_RAW ----------
             # xxx some performance issue here
-            for i in range(len(op.args)):
-                v = op.args[i]
+            for i in range(op.numargs()):
+                v = op.getarg(i)
                 if isinstance(v, ConstPtr) and bool(v.value):
                     addr = self.gcrefs.get_address_of_gcref(v.value)
                     # ^^^even for non-movable objects, to record their presence
@@ -574,23 +574,21 @@
                         newops.append(ResOperation(rop.GETFIELD_RAW,
                                                    [ConstInt(addr)], box,
                                                    self.single_gcref_descr))
-                        op.args[i] = box
+                        op.setarg(i, box)
             # ---------- write barrier for SETFIELD_GC ----------
-            if op.opnum == rop.SETFIELD_GC:
-                v = op.args[1]
+            if op.getopnum() == rop.SETFIELD_GC:
+                v = op.getarg(1)
                 if isinstance(v, BoxPtr) or (isinstance(v, ConstPtr) and
                                              bool(v.value)): # store a non-NULL
-                    self._gen_write_barrier(newops, op.args[0], v)
-                    op = ResOperation(rop.SETFIELD_RAW, op.args, None,
-                                      descr=op.descr)
+                    self._gen_write_barrier(newops, op.getarg(0), v)
+                    op = op.copy_and_change(rop.SETFIELD_RAW)
             # ---------- write barrier for SETARRAYITEM_GC ----------
-            if op.opnum == rop.SETARRAYITEM_GC:
-                v = op.args[2]
+            if op.getopnum() == rop.SETARRAYITEM_GC:
+                v = op.getarg(2)
                 if isinstance(v, BoxPtr) or (isinstance(v, ConstPtr) and
                                              bool(v.value)): # store a non-NULL
-                    self._gen_write_barrier(newops, op.args[0], v)
-                    op = ResOperation(rop.SETARRAYITEM_RAW, op.args, None,
-                                      descr=op.descr)
+                    self._gen_write_barrier(newops, op.getarg(0), v)
+                    op = op.copy_and_change(rop.SETARRAYITEM_RAW)
             # ----------
             newops.append(op)
         del operations[:]

Modified: pypy/trunk/pypy/jit/backend/llsupport/regalloc.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/llsupport/regalloc.py	(original)
+++ pypy/trunk/pypy/jit/backend/llsupport/regalloc.py	Wed Sep 22 14:17:16 2010
@@ -81,6 +81,10 @@
         for v in vars:
             self.possibly_free_var(v)
 
+    def possibly_free_vars_for_op(self, op):
+        for i in range(op.numargs()):
+            self.possibly_free_var(op.getarg(i))
+
     def _check_invariants(self):
         if not we_are_translated():
             # make sure no duplicates

Modified: pypy/trunk/pypy/jit/backend/llsupport/test/test_gc.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/llsupport/test/test_gc.py	(original)
+++ pypy/trunk/pypy/jit/backend/llsupport/test/test_gc.py	Wed Sep 22 14:17:16 2010
@@ -258,18 +258,18 @@
         gc_ll_descr._gen_write_barrier(newops, v_base, v_value)
         assert llop1.record == []
         assert len(newops) == 1
-        assert newops[0].opnum == rop.COND_CALL_GC_WB
-        assert newops[0].args[0] == v_base
-        assert newops[0].args[1] == v_value
+        assert newops[0].getopnum() == rop.COND_CALL_GC_WB
+        assert newops[0].getarg(0) == v_base
+        assert newops[0].getarg(1) == v_value
         assert newops[0].result is None
-        wbdescr = newops[0].descr
+        wbdescr = newops[0].getdescr()
         assert isinstance(wbdescr.jit_wb_if_flag, int)
         assert isinstance(wbdescr.jit_wb_if_flag_byteofs, int)
         assert isinstance(wbdescr.jit_wb_if_flag_singlebyte, int)
 
     def test_get_rid_of_debug_merge_point(self):
         operations = [
-            ResOperation(rop.DEBUG_MERGE_POINT, [], None),
+            ResOperation(rop.DEBUG_MERGE_POINT, ['dummy'], None),
             ]
         gc_ll_descr = self.gc_ll_descr
         gc_ll_descr.rewrite_assembler(None, operations)
@@ -298,13 +298,14 @@
         gc_ll_descr.gcrefs = MyFakeGCRefList()
         gc_ll_descr.rewrite_assembler(MyFakeCPU(), operations)
         assert len(operations) == 2
-        assert operations[0].opnum == rop.GETFIELD_RAW
-        assert operations[0].args == [ConstInt(43)]
-        assert operations[0].descr == gc_ll_descr.single_gcref_descr
+        assert operations[0].getopnum() == rop.GETFIELD_RAW
+        assert operations[0].getarg(0) == ConstInt(43)
+        assert operations[0].getdescr() == gc_ll_descr.single_gcref_descr
         v_box = operations[0].result
         assert isinstance(v_box, BoxPtr)
-        assert operations[1].opnum == rop.PTR_EQ
-        assert operations[1].args == [v_random_box, v_box]
+        assert operations[1].getopnum() == rop.PTR_EQ
+        assert operations[1].getarg(0) == v_random_box
+        assert operations[1].getarg(1) == v_box
         assert operations[1].result == v_result
 
     def test_rewrite_assembler_1_cannot_move(self):
@@ -336,8 +337,9 @@
         finally:
             rgc.can_move = old_can_move
         assert len(operations) == 1
-        assert operations[0].opnum == rop.PTR_EQ
-        assert operations[0].args == [v_random_box, ConstPtr(s_gcref)]
+        assert operations[0].getopnum() == rop.PTR_EQ
+        assert operations[0].getarg(0) == v_random_box
+        assert operations[0].getarg(1) == ConstPtr(s_gcref)
         assert operations[0].result == v_result
         # check that s_gcref gets added to the list anyway, to make sure
         # that the GC sees it
@@ -356,14 +358,15 @@
         gc_ll_descr.rewrite_assembler(self.fake_cpu, operations)
         assert len(operations) == 2
         #
-        assert operations[0].opnum == rop.COND_CALL_GC_WB
-        assert operations[0].args[0] == v_base
-        assert operations[0].args[1] == v_value
+        assert operations[0].getopnum() == rop.COND_CALL_GC_WB
+        assert operations[0].getarg(0) == v_base
+        assert operations[0].getarg(1) == v_value
         assert operations[0].result is None
         #
-        assert operations[1].opnum == rop.SETFIELD_RAW
-        assert operations[1].args == [v_base, v_value]
-        assert operations[1].descr == field_descr
+        assert operations[1].getopnum() == rop.SETFIELD_RAW
+        assert operations[1].getarg(0) == v_base
+        assert operations[1].getarg(1) == v_value
+        assert operations[1].getdescr() == field_descr
 
     def test_rewrite_assembler_3(self):
         # check write barriers before SETARRAYITEM_GC
@@ -379,11 +382,13 @@
         gc_ll_descr.rewrite_assembler(self.fake_cpu, operations)
         assert len(operations) == 2
         #
-        assert operations[0].opnum == rop.COND_CALL_GC_WB
-        assert operations[0].args[0] == v_base
-        assert operations[0].args[1] == v_value
+        assert operations[0].getopnum() == rop.COND_CALL_GC_WB
+        assert operations[0].getarg(0) == v_base
+        assert operations[0].getarg(1) == v_value
         assert operations[0].result is None
         #
-        assert operations[1].opnum == rop.SETARRAYITEM_RAW
-        assert operations[1].args == [v_base, v_index, v_value]
-        assert operations[1].descr == array_descr
+        assert operations[1].getopnum() == rop.SETARRAYITEM_RAW
+        assert operations[1].getarg(0) == v_base
+        assert operations[1].getarg(1) == v_index
+        assert operations[1].getarg(2) == v_value
+        assert operations[1].getdescr() == array_descr

Modified: pypy/trunk/pypy/jit/backend/llvm/compile.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/llvm/compile.py	(original)
+++ pypy/trunk/pypy/jit/backend/llvm/compile.py	Wed Sep 22 14:17:16 2010
@@ -107,7 +107,7 @@
         # store away the exception into self.backup_exc_xxx, *unless* the
         # branch starts with a further GUARD_EXCEPTION/GUARD_NO_EXCEPTION.
         if exc:
-            opnum = operations[0].opnum
+            opnum = operations[0].getopnum()
             if opnum not in (rop.GUARD_EXCEPTION, rop.GUARD_NO_EXCEPTION):
                 self._store_away_exception()
         # Normal handling of the operations follows.
@@ -115,7 +115,7 @@
             self._generate_op(op)
 
     def _generate_op(self, op):
-        opnum = op.opnum
+        opnum = op.getopnum()
         for i, name in all_operations:
             if opnum == i:
                 meth = getattr(self, name)
@@ -475,7 +475,7 @@
         return location
 
     def generate_GETFIELD_GC(self, op):
-        loc = self._generate_field_gep(op.args[0], op.descr)
+        loc = self._generate_field_gep(op.args[0], op.getdescr())
         self.vars[op.result] = llvm_rffi.LLVMBuildLoad(self.builder, loc, "")
 
     generate_GETFIELD_GC_PURE  = generate_GETFIELD_GC
@@ -483,7 +483,7 @@
     generate_GETFIELD_RAW_PURE = generate_GETFIELD_GC
 
     def generate_SETFIELD_GC(self, op):
-        fielddescr = op.descr
+        fielddescr = op.getdescr()
         loc = self._generate_field_gep(op.args[0], fielddescr)
         assert isinstance(fielddescr, FieldDescr)
         getarg = self.cpu.getarg_by_index[fielddescr.size_index]
@@ -491,7 +491,7 @@
         llvm_rffi.LLVMBuildStore(self.builder, value_ref, loc, "")
 
     def generate_CALL(self, op):
-        calldescr = op.descr
+        calldescr = op.getdescr()
         assert isinstance(calldescr, CallDescr)
         ty_function_ptr = self.cpu.get_calldescr_ty_function_ptr(calldescr)
         v = op.args[0]
@@ -579,7 +579,7 @@
         self.vars[op.result] = llvm_rffi.LLVMBuildLoad(self.builder, loc, "")
 
     def generate_ARRAYLEN_GC(self, op):
-        arraydescr = op.descr
+        arraydescr = op.getdescr()
         assert isinstance(arraydescr, ArrayDescr)
         self._generate_len(op, arraydescr.ty_array_ptr,
                            self.cpu.const_array_index_length)
@@ -598,7 +598,7 @@
         return location
 
     def _generate_array_gep(self, op):
-        arraydescr = op.descr
+        arraydescr = op.getdescr()
         assert isinstance(arraydescr, ArrayDescr)
         location = self._generate_gep(op, arraydescr.ty_array_ptr,
                                       self.cpu.const_array_index_array)
@@ -612,7 +612,7 @@
 
     def generate_SETARRAYITEM_GC(self, op):
         loc = self._generate_array_gep(op)
-        arraydescr = op.descr
+        arraydescr = op.getdescr()
         assert isinstance(arraydescr, ArrayDescr)
         getarg = self.cpu.getarg_by_index[arraydescr.itemsize_index]
         value_ref = getarg(self, op.args[2])
@@ -660,7 +660,7 @@
         return res
 
     def generate_NEW(self, op):
-        sizedescr = op.descr
+        sizedescr = op.getdescr()
         assert isinstance(sizedescr, SizeDescr)
         res = self._generate_new(self.cpu._make_const_int(sizedescr.size))
         self.vars[op.result] = res
@@ -695,7 +695,7 @@
         self.vars[op.result] = res
 
     def generate_NEW_ARRAY(self, op):
-        arraydescr = op.descr
+        arraydescr = op.getdescr()
         assert isinstance(arraydescr, ArrayDescr)
         self._generate_new_array(op, arraydescr.ty_array_ptr,
                                  self.cpu._make_const_int(arraydescr.itemsize),

Modified: pypy/trunk/pypy/jit/backend/test/runner_test.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/test/runner_test.py	(original)
+++ pypy/trunk/pypy/jit/backend/test/runner_test.py	Wed Sep 22 14:17:16 2010
@@ -1,5 +1,6 @@
 import py, sys, random, os, struct, operator
 from pypy.jit.metainterp.history import (AbstractFailDescr,
+                                         AbstractDescr,
                                          BasicFailDescr,
                                          BoxInt, Box, BoxPtr,
                                          LoopToken,
@@ -39,7 +40,7 @@
             else:
                 raise NotImplementedError(box)
         res = self.cpu.execute_token(looptoken)
-        if res is operations[-1].descr:
+        if res is operations[-1].getdescr():
             self.guard_failed = False
         else:
             self.guard_failed = True
@@ -74,10 +75,11 @@
                       ResOperation(rop.FINISH, results, None,
                                    descr=BasicFailDescr(0))]
         if operations[0].is_guard():
-            operations[0].fail_args = []
+            operations[0].setfailargs([])
             if not descr:
                 descr = BasicFailDescr(1)
-        operations[0].descr = descr
+        if descr is not None:
+            operations[0].setdescr(descr)
         inputargs = []
         for box in valueboxes:
             if isinstance(box, Box) and box not in inputargs:
@@ -116,7 +118,7 @@
             ResOperation(rop.JUMP, [i1], None, descr=looptoken),
             ]
         inputargs = [i0]
-        operations[2].fail_args = [i1]
+        operations[2].setfailargs([i1])
         
         self.cpu.compile_loop(inputargs, operations, looptoken)
         self.cpu.set_future_value_int(0, 2)
@@ -137,7 +139,7 @@
             ResOperation(rop.JUMP, [i1], None, descr=looptoken),
             ]
         inputargs = [i0]
-        operations[2].fail_args = [None, None, i1, None]
+        operations[2].setfailargs([None, None, i1, None])
         
         self.cpu.compile_loop(inputargs, operations, looptoken)
         self.cpu.set_future_value_int(0, 2)
@@ -160,7 +162,7 @@
             ResOperation(rop.JUMP, [i1], None, descr=looptoken),
             ]
         inputargs = [i0]
-        operations[2].fail_args = [i1]
+        operations[2].setfailargs([i1])
         wr_i1 = weakref.ref(i1)
         wr_guard = weakref.ref(operations[2])
         self.cpu.compile_loop(inputargs, operations, looptoken)
@@ -184,7 +186,7 @@
             ResOperation(rop.JUMP, [i1], None, descr=looptoken),
             ]
         inputargs = [i0]
-        operations[2].fail_args = [i1]
+        operations[2].setfailargs([i1])
         self.cpu.compile_loop(inputargs, operations, looptoken)
 
         i1b = BoxInt()
@@ -194,7 +196,7 @@
             ResOperation(rop.GUARD_TRUE, [i3], None, descr=faildescr2),
             ResOperation(rop.JUMP, [i1b], None, descr=looptoken),
         ]
-        bridge[1].fail_args = [i1b]
+        bridge[1].setfailargs([i1b])
 
         self.cpu.compile_bridge(faildescr1, [i1b], bridge)        
 
@@ -218,7 +220,7 @@
             ResOperation(rop.JUMP, [i1], None, descr=looptoken),
             ]
         inputargs = [i0]
-        operations[2].fail_args = [None, i1, None]
+        operations[2].setfailargs([None, i1, None])
         self.cpu.compile_loop(inputargs, operations, looptoken)
 
         i1b = BoxInt()
@@ -228,7 +230,7 @@
             ResOperation(rop.GUARD_TRUE, [i3], None, descr=faildescr2),
             ResOperation(rop.JUMP, [i1b], None, descr=looptoken),
         ]
-        bridge[1].fail_args = [i1b]
+        bridge[1].setfailargs([i1b])
 
         self.cpu.compile_bridge(faildescr1, [i1b], bridge)        
 
@@ -251,7 +253,7 @@
             ResOperation(rop.JUMP, [i1], None, descr=looptoken),
             ]
         inputargs = [i0]
-        operations[2].fail_args = [None, i1, None]
+        operations[2].setfailargs([None, i1, None])
         self.cpu.compile_loop(inputargs, operations, looptoken)
 
         self.cpu.set_future_value_int(0, 2)
@@ -317,7 +319,7 @@
                          descr=BasicFailDescr()),
             ResOperation(rop.JUMP, [z, t], None, descr=looptoken),
             ]
-        operations[-2].fail_args = [t, z]
+        operations[-2].setfailargs([t, z])
         cpu.compile_loop([x, y], operations, looptoken)
         self.cpu.set_future_value_int(0, 0)
         self.cpu.set_future_value_int(1, 10)
@@ -363,7 +365,7 @@
                     ResOperation(rop.FINISH, [v_res], None,
                                  descr=BasicFailDescr(2)),
                     ]
-                ops[1].fail_args = []
+                ops[1].setfailargs([])
             else:
                 v_exc = self.cpu.ts.BoxRef()
                 ops = [
@@ -372,7 +374,7 @@
                                  descr=BasicFailDescr(1)),
                     ResOperation(rop.FINISH, [], None, descr=BasicFailDescr(2)),
                     ]
-                ops[1].fail_args = [v_res]
+                ops[1].setfailargs([v_res])
             #
             looptoken = LoopToken()
             self.cpu.compile_loop([v1, v2], ops, looptoken)
@@ -909,8 +911,8 @@
                 ResOperation(rop.GUARD_TRUE, [i2], None),
                 ResOperation(rop.JUMP, jumpargs, None, descr=looptoken),
                 ]
-            operations[2].fail_args = inputargs[:]
-            operations[2].descr = faildescr
+            operations[2].setfailargs(inputargs[:])
+            operations[2].setdescr(faildescr)
             #
             self.cpu.compile_loop(inputargs, operations, looptoken)
             #
@@ -975,7 +977,7 @@
             ResOperation(rop.GUARD_TRUE, [i2], None, descr=faildescr1),
             ResOperation(rop.FINISH, fboxes, None, descr=faildescr2),
             ]
-        operations[-2].fail_args = fboxes
+        operations[-2].setfailargs(fboxes)
         looptoken = LoopToken()
         self.cpu.compile_loop(fboxes, operations, looptoken)
 
@@ -1098,7 +1100,7 @@
                                          descr=BasicFailDescr(4)),
                             ResOperation(rop.FINISH, [], None,
                                          descr=BasicFailDescr(5))]
-                        operations[1].fail_args = []
+                        operations[1].setfailargs([])
                         looptoken = LoopToken()
                         # Use "set" to unique-ify inputargs
                         unique_testcase_list = list(set(testcase))
@@ -1412,7 +1414,7 @@
         FUNC = self.FuncType([lltype.Ptr(S), lltype.Signed], lltype.Void)
         func_ptr = llhelper(lltype.Ptr(FUNC), func_void)
         funcbox = self.get_funcbox(self.cpu, func_ptr)
-        class WriteBarrierDescr:
+        class WriteBarrierDescr(AbstractDescr):
             jit_wb_if_flag = 4096
             jit_wb_if_flag_byteofs = struct.pack("i", 4096).index('\x10')
             jit_wb_if_flag_singlebyte = 0x10
@@ -1462,7 +1464,7 @@
         ResOperation(rop.GUARD_NOT_FORCED, [], None, descr=faildescr),
         ResOperation(rop.FINISH, [i0], None, descr=BasicFailDescr(0))
         ]
-        ops[2].fail_args = [i1, i0]
+        ops[2].setfailargs([i1, i0])
         looptoken = LoopToken()
         self.cpu.compile_loop([i0, i1], ops, looptoken)
         self.cpu.set_future_value_int(0, 20)
@@ -1506,7 +1508,7 @@
         ResOperation(rop.GUARD_NOT_FORCED, [], None, descr=faildescr),
         ResOperation(rop.FINISH, [i2], None, descr=BasicFailDescr(0))
         ]
-        ops[2].fail_args = [i1, i2, i0]
+        ops[2].setfailargs([i1, i2, i0])
         looptoken = LoopToken()
         self.cpu.compile_loop([i0, i1], ops, looptoken)
         self.cpu.set_future_value_int(0, 20)
@@ -1551,7 +1553,7 @@
         ResOperation(rop.GUARD_NOT_FORCED, [], None, descr=faildescr),
         ResOperation(rop.FINISH, [f2], None, descr=BasicFailDescr(0))
         ]
-        ops[2].fail_args = [i1, f2, i0]
+        ops[2].setfailargs([i1, f2, i0])
         looptoken = LoopToken()
         self.cpu.compile_loop([i0, i1], ops, looptoken)
         self.cpu.set_future_value_int(0, 20)
@@ -1824,7 +1826,7 @@
         f2 = float_add(f0, f1)
         finish(f2)'''
         loop = parse(ops)
-        done_number = self.cpu.get_fail_descr_number(loop.operations[-1].descr)
+        done_number = self.cpu.get_fail_descr_number(loop.operations[-1].getdescr())
         looptoken = LoopToken()
         looptoken.outermost_jitdriver_sd = FakeJitDriverSD()
         self.cpu.compile_loop(loop.inputargs, loop.operations, looptoken)

Modified: pypy/trunk/pypy/jit/backend/test/test_ll_random.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/test/test_ll_random.py	(original)
+++ pypy/trunk/pypy/jit/backend/test/test_ll_random.py	Wed Sep 22 14:17:16 2010
@@ -464,7 +464,7 @@
         self.put(builder, args, descr)
         op = ResOperation(rop.GUARD_NO_EXCEPTION, [], None,
                           descr=BasicFailDescr())
-        op.fail_args = fail_subset
+        op.setfailargs(fail_subset)
         builder.loop.operations.append(op)
 
 # 5. Non raising-call and GUARD_EXCEPTION
@@ -486,7 +486,7 @@
         exc_box = ConstAddr(llmemory.cast_ptr_to_adr(vtableptr), builder.cpu)
         op = ResOperation(rop.GUARD_EXCEPTION, [exc_box], BoxPtr(),
                           descr=BasicFailDescr())
-        op.fail_args = builder.subset_of_intvars(r)
+        op.setfailargs(builder.subset_of_intvars(r))
         op._exc_box = None
         builder.should_fail_by = op
         builder.guard_op = op
@@ -507,7 +507,7 @@
         exc_box = ConstAddr(llmemory.cast_ptr_to_adr(exc), builder.cpu)
         op = ResOperation(rop.GUARD_EXCEPTION, [exc_box], BoxPtr(),
                           descr=BasicFailDescr())
-        op.fail_args = fail_subset
+        op.setfailargs(fail_subset)
         builder.loop.operations.append(op)
 
 # 4. raising call and guard_no_exception
@@ -524,7 +524,7 @@
         op = ResOperation(rop.GUARD_NO_EXCEPTION, [], BoxPtr(),
                           descr=BasicFailDescr())
         op._exc_box = ConstAddr(llmemory.cast_ptr_to_adr(exc), builder.cpu)
-        op.fail_args = builder.subset_of_intvars(r)
+        op.setfailargs(builder.subset_of_intvars(r))
         builder.should_fail_by = op
         builder.guard_op = op
         builder.loop.operations.append(op)
@@ -548,7 +548,7 @@
         op = ResOperation(rop.GUARD_EXCEPTION, [other_box], BoxPtr(),
                           descr=BasicFailDescr())
         op._exc_box = ConstAddr(llmemory.cast_ptr_to_adr(exc), builder.cpu)
-        op.fail_args = builder.subset_of_intvars(r)
+        op.setfailargs(builder.subset_of_intvars(r))
         builder.should_fail_by = op
         builder.guard_op = op
         builder.loop.operations.append(op)

Modified: pypy/trunk/pypy/jit/backend/test/test_random.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/test/test_random.py	(original)
+++ pypy/trunk/pypy/jit/backend/test/test_random.py	Wed Sep 22 14:17:16 2010
@@ -86,7 +86,7 @@
 
     def process_operation(self, s, op, names, subops):
         args = []
-        for v in op.args:
+        for v in op.getarglist():
             if v in names:
                 args.append(names[v])
 ##            elif isinstance(v, ConstAddr):
@@ -105,11 +105,11 @@
                 args.append('ConstInt(%d)' % v.value)
             else:
                 raise NotImplementedError(v)
-        if op.descr is None:
+        if op.getdescr() is None:
             descrstr = ''
         else:
             try:
-                descrstr = ', ' + op.descr._random_info
+                descrstr = ', ' + op.getdescr()._random_info
             except AttributeError:
                 descrstr = ', descr=...'
         print >>s, '        ResOperation(rop.%s, [%s], %s%s),' % (
@@ -129,7 +129,7 @@
 
         def print_loop_prebuilt(ops):
             for op in ops:
-                for arg in op.args:
+                for arg in op.getarglist():
                     if isinstance(arg, ConstPtr):
                         if arg not in names:
                             writevar(arg, 'const_ptr')
@@ -191,7 +191,7 @@
         if self.should_fail_by is None:
             fail_args = self.loop.operations[-1].args
         else:
-            fail_args = self.should_fail_by.fail_args
+            fail_args = self.should_fail_by.getfailargs()
         for i, v in enumerate(fail_args):
             if isinstance(v, (BoxFloat, ConstFloat)):
                 print >>s, ('    assert cpu.get_latest_value_float(%d) == %r'
@@ -284,8 +284,8 @@
             builder.intvars[:] = original_intvars
         else:
             op = ResOperation(rop.GUARD_NO_OVERFLOW, [], None)
-        op.descr = BasicFailDescr()
-        op.fail_args = fail_subset
+        op.setdescr(BasicFailDescr())
+        op.setfailargs(fail_subset)
         builder.loop.operations.append(op)
 
 class BinaryOvfOperation(AbstractOvfOperation, BinaryOperation):
@@ -345,8 +345,8 @@
     def produce_into(self, builder, r):
         op, passing = self.gen_guard(builder, r)
         builder.loop.operations.append(op)
-        op.descr = BasicFailDescr()
-        op.fail_args = builder.subset_of_intvars(r)
+        op.setdescr(BasicFailDescr())
+        op.setfailargs(builder.subset_of_intvars(r))
         if not passing:
             builder.should_fail_by = op
             builder.guard_op = op
@@ -553,7 +553,7 @@
         endvars = []
         used_later = {}
         for op in loop.operations:
-            for v in op.args:
+            for v in op.getarglist():
                 used_later[v] = True
         for v in startvars:
             if v not in used_later:
@@ -577,11 +577,11 @@
 
     def get_fail_args(self):
         if self.should_fail_by.is_guard():
-            assert self.should_fail_by.fail_args is not None
-            return self.should_fail_by.fail_args
+            assert self.should_fail_by.getfailargs() is not None
+            return self.should_fail_by.getfailargs()
         else:
-            assert self.should_fail_by.opnum == rop.FINISH
-            return self.should_fail_by.args
+            assert self.should_fail_by.getopnum() == rop.FINISH
+            return self.should_fail_by.getarglist()
 
     def clear_state(self):
         for v, S, fields in self.prebuilt_ptr_consts:
@@ -606,7 +606,7 @@
             else:
                 raise NotImplementedError(box)
         fail = cpu.execute_token(self.loop.token)
-        assert fail is self.should_fail_by.descr
+        assert fail is self.should_fail_by.getdescr()
         for i, v in enumerate(self.get_fail_args()):
             if isinstance(v, (BoxFloat, ConstFloat)):
                 value = cpu.get_latest_value_float(i)
@@ -620,7 +620,7 @@
         exc = cpu.grab_exc_value()
         if (self.guard_op is not None and
             self.guard_op.is_guard_exception()):
-            if self.guard_op.opnum == rop.GUARD_NO_EXCEPTION:
+            if self.guard_op.getopnum() == rop.GUARD_NO_EXCEPTION:
                 assert exc
         else:
             assert not exc
@@ -633,26 +633,26 @@
             else:
                 op = ResOperation(rop.GUARD_EXCEPTION, [guard_op._exc_box],
                                   BoxPtr())
-            op.descr = BasicFailDescr()
-            op.fail_args = []
+            op.setdescr(BasicFailDescr())
+            op.setfailargs([])
             return op
 
         if self.dont_generate_more:
             return False
         r = self.r
         guard_op = self.guard_op
-        fail_args = guard_op.fail_args
-        fail_descr = guard_op.descr
+        fail_args = guard_op.getfailargs()
+        fail_descr = guard_op.getdescr()
         op = self.should_fail_by
-        if not op.fail_args:
+        if not op.getfailargs():
             return False
         # generate the branch: a sequence of operations that ends in a FINISH
         subloop = DummyLoop([])
         if guard_op.is_guard_exception():
             subloop.operations.append(exc_handling(guard_op))
         bridge_builder = self.builder.fork(self.builder.cpu, subloop,
-                                           op.fail_args[:])
-        self.generate_ops(bridge_builder, r, subloop, op.fail_args[:])
+                                           op.getfailargs()[:])
+        self.generate_ops(bridge_builder, r, subloop, op.getfailargs()[:])
         # note that 'self.guard_op' now points to the guard that will fail in
         # this new bridge, while 'guard_op' still points to the guard that
         # has just failed.

Modified: pypy/trunk/pypy/jit/backend/x86/assembler.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/x86/assembler.py	(original)
+++ pypy/trunk/pypy/jit/backend/x86/assembler.py	Wed Sep 22 14:17:16 2010
@@ -390,8 +390,8 @@
     def _find_debug_merge_point(self, operations):
 
         for op in operations:
-            if op.opnum == rop.DEBUG_MERGE_POINT:
-                funcname = op.args[0]._get_str()
+            if op.getopnum() == rop.DEBUG_MERGE_POINT:
+                funcname = op.getarg(0)._get_str()
                 break
         else:
             funcname = "<loop %d>" % len(self.loop_run_counters)
@@ -684,25 +684,25 @@
             self.mc.POP(loc)
 
     def regalloc_perform(self, op, arglocs, resloc):
-        genop_list[op.opnum](self, op, arglocs, resloc)
+        genop_list[op.getopnum()](self, op, arglocs, resloc)
 
     def regalloc_perform_discard(self, op, arglocs):
-        genop_discard_list[op.opnum](self, op, arglocs)
+        genop_discard_list[op.getopnum()](self, op, arglocs)
 
     def regalloc_perform_with_guard(self, op, guard_op, faillocs,
                                     arglocs, resloc, current_depths):
-        faildescr = guard_op.descr
+        faildescr = guard_op.getdescr()
         assert isinstance(faildescr, AbstractFailDescr)
         faildescr._x86_current_depths = current_depths
-        failargs = guard_op.fail_args
-        guard_opnum = guard_op.opnum
+        failargs = guard_op.getfailargs()
+        guard_opnum = guard_op.getopnum()
         guard_token = self.implement_guard_recovery(guard_opnum,
                                                     faildescr, failargs,
                                                     faillocs)
         if op is None:
             dispatch_opnum = guard_opnum
         else:
-            dispatch_opnum = op.opnum
+            dispatch_opnum = op.getopnum()
         res = genop_guard_list[dispatch_opnum](self, op, guard_op, guard_token,
                                                arglocs, resloc)
         faildescr._x86_adr_jump_offset = res
@@ -728,7 +728,7 @@
     def _cmpop(cond, rev_cond):
         def genop_cmp(self, op, arglocs, result_loc):
             rl = result_loc.lowest8bits()
-            if isinstance(op.args[0], Const):
+            if isinstance(op.getarg(0), Const):
                 self.mc.CMP(arglocs[1], arglocs[0])
                 self.mc.SET_ir(rx86.Conditions[rev_cond], rl.value)
             else:
@@ -758,8 +758,8 @@
 
     def _cmpop_guard(cond, rev_cond, false_cond, false_rev_cond):
         def genop_cmp_guard(self, op, guard_op, guard_token, arglocs, result_loc):
-            guard_opnum = guard_op.opnum
-            if isinstance(op.args[0], Const):
+            guard_opnum = guard_op.getopnum()
+            if isinstance(op.getarg(0), Const):
                 self.mc.CMP(arglocs[1], arglocs[0])
                 if guard_opnum == rop.GUARD_FALSE:
                     return self.implement_guard(guard_token, rev_cond)
@@ -776,7 +776,7 @@
     def _cmpop_guard_float(cond, false_cond, need_jp):
         def genop_cmp_guard_float(self, op, guard_op, guard_token, arglocs,
                                   result_loc):
-            guard_opnum = guard_op.opnum
+            guard_opnum = guard_op.getopnum()
             self.mc.UCOMISD(arglocs[0], arglocs[1])
             # 16 is enough space for the rel8 jumps below and the rel32
             # jump in implement_guard
@@ -945,7 +945,7 @@
     genop_guard_float_ge = _cmpop_guard_float("AE", "B", False)
 
     def genop_guard_float_ne(self, op, guard_op, guard_token, arglocs, result_loc):
-        guard_opnum = guard_op.opnum
+        guard_opnum = guard_op.getopnum()
         self.mc.UCOMISD(arglocs[0], arglocs[1])
         # 16 is enough space for the rel8 jumps below and the rel32
         # jump in implement_guard
@@ -973,7 +973,7 @@
         self.mc.CVTSI2SD(resloc, arglocs[0])
 
     def genop_guard_int_is_true(self, op, guard_op, guard_token, arglocs, resloc):
-        guard_opnum = guard_op.opnum
+        guard_opnum = guard_op.getopnum()
         self.mc.CMP(arglocs[0], imm(0))
         if guard_opnum == rop.GUARD_TRUE:
             return self.implement_guard(guard_token, 'Z')
@@ -987,7 +987,7 @@
         self.mc.MOVZX8(resloc, rl)
 
     def genop_guard_int_is_zero(self, op, guard_op, guard_token, arglocs, resloc):
-        guard_opnum = guard_op.opnum
+        guard_opnum = guard_op.getopnum()
         self.mc.CMP(arglocs[0], imm(0))
         if guard_opnum == rop.GUARD_TRUE:
             return self.implement_guard(guard_token, 'NZ')
@@ -1123,7 +1123,7 @@
         assert isinstance(baseofs, ImmedLoc)
         assert isinstance(scale_loc, ImmedLoc)
         dest_addr = AddressLoc(base_loc, ofs_loc, scale_loc.value, baseofs.value)
-        if op.args[2].type == FLOAT:
+        if op.getarg(2).type == FLOAT:
             self.mc.MOVSD(dest_addr, value_loc)
         else:
             if IS_X86_64 and scale_loc.value == 3:
@@ -1219,7 +1219,7 @@
         return addr
 
     def _gen_guard_overflow(self, guard_op, guard_token):
-        guard_opnum = guard_op.opnum
+        guard_opnum = guard_op.getopnum()
         if guard_opnum == rop.GUARD_NO_OVERFLOW:
             return self.implement_guard(guard_token, 'O')
         elif guard_opnum == rop.GUARD_OVERFLOW:
@@ -1247,8 +1247,8 @@
     genop_guard_guard_isnull = genop_guard_guard_false
 
     def genop_guard_guard_value(self, ign_1, guard_op, guard_token, locs, ign_2):
-        if guard_op.args[0].type == FLOAT:
-            assert guard_op.args[1].type == FLOAT
+        if guard_op.getarg(0).type == FLOAT:
+            assert guard_op.getarg(1).type == FLOAT
             self.mc.UCOMISD(locs[0], locs[1])
         else:
             self.mc.CMP(locs[0], locs[1])
@@ -1639,8 +1639,8 @@
         assert isinstance(sizeloc, ImmedLoc)
         size = sizeloc.value
 
-        if isinstance(op.args[0], Const):
-            x = imm(op.args[0].getint())
+        if isinstance(op.getarg(0), Const):
+            x = imm(op.getarg(0).getint())
         else:
             x = arglocs[1]
         if x is eax:
@@ -1659,7 +1659,7 @@
     
     def genop_guard_call_may_force(self, op, guard_op, guard_token,
                                    arglocs, result_loc):
-        faildescr = guard_op.descr
+        faildescr = guard_op.getdescr()
         fail_index = self.cpu.get_fail_descr_number(faildescr)
         self.mc.MOV_bi(FORCE_INDEX_OFS, fail_index)
         self.genop_call(op, arglocs, result_loc)
@@ -1668,10 +1668,10 @@
 
     def genop_guard_call_assembler(self, op, guard_op, guard_token,
                                    arglocs, result_loc):
-        faildescr = guard_op.descr
+        faildescr = guard_op.getdescr()
         fail_index = self.cpu.get_fail_descr_number(faildescr)
         self.mc.MOV_bi(FORCE_INDEX_OFS, fail_index)
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, LoopToken)
         assert len(arglocs) - 2 == len(descr._x86_arglocs[0])
         #
@@ -1756,7 +1756,7 @@
     def genop_discard_cond_call_gc_wb(self, op, arglocs):
         # use 'mc._mc' directly instead of 'mc', to avoid
         # bad surprizes if the code buffer is mostly full
-        descr = op.descr
+        descr = op.getdescr()
         if we_are_translated():
             cls = self.cpu.gc_ll_descr.has_write_barrier_class()
             assert cls is not None and isinstance(descr, cls)

Modified: pypy/trunk/pypy/jit/backend/x86/regalloc.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/x86/regalloc.py	(original)
+++ pypy/trunk/pypy/jit/backend/x86/regalloc.py	Wed Sep 22 14:17:16 2010
@@ -234,6 +234,12 @@
         else:
             self.rm.possibly_free_var(var)
 
+    def possibly_free_vars_for_op(self, op):
+        for i in range(op.numargs()):
+            var = op.getarg(i)
+            if var is not None: # xxx kludgy
+                self.possibly_free_var(var)
+
     def possibly_free_vars(self, vars):
         for var in vars:
             if var is not None: # xxx kludgy
@@ -262,12 +268,12 @@
                                               selected_reg, need_lower_byte)
 
     def _compute_loop_consts(self, inputargs, jump, looptoken):
-        if jump.opnum != rop.JUMP or jump.descr is not looptoken:
+        if jump.getopnum() != rop.JUMP or jump.getdescr() is not looptoken:
             loop_consts = {}
         else:
             loop_consts = {}
             for i in range(len(inputargs)):
-                if inputargs[i] is jump.args[i]:
+                if inputargs[i] is jump.getarg(i):
                     loop_consts[inputargs[i]] = i
         return loop_consts
 
@@ -312,7 +318,7 @@
         self.assembler.regalloc_perform(op, arglocs, result_loc)
 
     def locs_for_fail(self, guard_op):
-        return [self.loc(v) for v in guard_op.fail_args]
+        return [self.loc(v) for v in guard_op.getfailargs()]
 
     def perform_with_guard(self, op, guard_op, arglocs, result_loc):
         faillocs = self.locs_for_fail(guard_op)
@@ -324,7 +330,7 @@
                                                    current_depths)
         if op.result is not None:
             self.possibly_free_var(op.result)
-        self.possibly_free_vars(guard_op.fail_args)
+        self.possibly_free_vars(guard_op.getfailargs())
 
     def perform_guard(self, guard_op, arglocs, result_loc):
         faillocs = self.locs_for_fail(guard_op)
@@ -338,7 +344,7 @@
         self.assembler.regalloc_perform_guard(guard_op, faillocs, arglocs,
                                               result_loc,
                                               current_depths)
-        self.possibly_free_vars(guard_op.fail_args)        
+        self.possibly_free_vars(guard_op.getfailargs())        
 
     def PerformDiscard(self, op, arglocs):
         if not we_are_translated():
@@ -346,24 +352,24 @@
         self.assembler.regalloc_perform_discard(op, arglocs)
 
     def can_merge_with_next_guard(self, op, i, operations):
-        if op.opnum == rop.CALL_MAY_FORCE or op.opnum == rop.CALL_ASSEMBLER:
-            assert operations[i + 1].opnum == rop.GUARD_NOT_FORCED
+        if op.getopnum() == rop.CALL_MAY_FORCE or op.getopnum() == rop.CALL_ASSEMBLER:
+            assert operations[i + 1].getopnum() == rop.GUARD_NOT_FORCED
             return True
         if not op.is_comparison():
             if op.is_ovf():
-                if (operations[i + 1].opnum != rop.GUARD_NO_OVERFLOW and
-                    operations[i + 1].opnum != rop.GUARD_OVERFLOW):
+                if (operations[i + 1].getopnum() != rop.GUARD_NO_OVERFLOW and
+                    operations[i + 1].getopnum() != rop.GUARD_OVERFLOW):
                     print "int_xxx_ovf not followed by guard_(no)_overflow"
                     raise AssertionError
                 return True
             return False
-        if (operations[i + 1].opnum != rop.GUARD_TRUE and
-            operations[i + 1].opnum != rop.GUARD_FALSE):
+        if (operations[i + 1].getopnum() != rop.GUARD_TRUE and
+            operations[i + 1].getopnum() != rop.GUARD_FALSE):
             return False
-        if operations[i + 1].args[0] is not op.result:
+        if operations[i + 1].getarg(0) is not op.result:
             return False
         if (self.longevity[op.result][1] > i + 1 or
-            op.result in operations[i + 1].fail_args):
+            op.result in operations[i + 1].getfailargs()):
             return False
         return True
 
@@ -376,13 +382,13 @@
             self.xrm.position = i
             if op.has_no_side_effect() and op.result not in self.longevity:
                 i += 1
-                self.possibly_free_vars(op.args)
+                self.possibly_free_vars_for_op(op)
                 continue
             if self.can_merge_with_next_guard(op, i, operations):
-                oplist_with_guard[op.opnum](self, op, operations[i + 1])
+                oplist_with_guard[op.getopnum()](self, op, operations[i + 1])
                 i += 1
             else:
-                oplist[op.opnum](self, op)
+                oplist[op.getopnum()](self, op)
             if op.result is not None:
                 self.possibly_free_var(op.result)
             self.rm._check_invariants()
@@ -402,19 +408,20 @@
             op = operations[i]
             if op.result is not None:
                 start_live[op.result] = i
-            for arg in op.args:
+            for j in range(op.numargs()):
+                arg = op.getarg(j)
                 if isinstance(arg, Box):
                     if arg not in start_live:
-                        print "Bogus arg in operation %d at %d" % (op.opnum, i)
+                        print "Bogus arg in operation %d at %d" % (op.getopnum(), i)
                         raise AssertionError
                     longevity[arg] = (start_live[arg], i)
             if op.is_guard():
-                for arg in op.fail_args:
+                for arg in op.getfailargs():
                     if arg is None: # hole
                         continue
                     assert isinstance(arg, Box)
                     if arg not in start_live:
-                        print "Bogus arg in guard %d at %d" % (op.opnum, i)
+                        print "Bogus arg in guard %d at %d" % (op.getopnum(), i)
                         raise AssertionError
                     longevity[arg] = (start_live[arg], i)
         for arg in inputargs:
@@ -432,9 +439,9 @@
         return self.rm.loc(v)
 
     def _consider_guard(self, op):
-        loc = self.rm.make_sure_var_in_reg(op.args[0])
+        loc = self.rm.make_sure_var_in_reg(op.getarg(0))
         self.perform_guard(op, [loc], None)
-        self.rm.possibly_free_var(op.args[0])
+        self.rm.possibly_free_var(op.getarg(0))
 
     consider_guard_true = _consider_guard
     consider_guard_false = _consider_guard
@@ -442,52 +449,54 @@
     consider_guard_isnull = _consider_guard
 
     def consider_finish(self, op):
-        locs = [self.loc(v) for v in op.args]
-        locs_are_ref = [v.type == REF for v in op.args]
-        fail_index = self.assembler.cpu.get_fail_descr_number(op.descr)
+        locs = [self.loc(op.getarg(i)) for i in range(op.numargs())]
+        locs_are_ref = [op.getarg(i).type == REF for i in range(op.numargs())]
+        fail_index = self.assembler.cpu.get_fail_descr_number(op.getdescr())
         self.assembler.generate_failure(fail_index, locs, self.exc,
                                         locs_are_ref)
-        self.possibly_free_vars(op.args)
+        self.possibly_free_vars_for_op(op)
 
     def consider_guard_no_exception(self, op):
         self.perform_guard(op, [], None)
 
     def consider_guard_exception(self, op):
-        loc = self.rm.make_sure_var_in_reg(op.args[0])
+        loc = self.rm.make_sure_var_in_reg(op.getarg(0))
         box = TempBox()
-        loc1 = self.rm.force_allocate_reg(box, op.args)
+        args = op.getarglist()
+        loc1 = self.rm.force_allocate_reg(box, args)
         if op.result in self.longevity:
             # this means, is it ever used
-            resloc = self.rm.force_allocate_reg(op.result, op.args + [box])
+            resloc = self.rm.force_allocate_reg(op.result, args + [box])
         else:
             resloc = None
         self.perform_guard(op, [loc, loc1], resloc)
-        self.rm.possibly_free_vars(op.args)
+        self.rm.possibly_free_vars_for_op(op)
         self.rm.possibly_free_var(box)
 
     consider_guard_no_overflow = consider_guard_no_exception
     consider_guard_overflow    = consider_guard_no_exception
 
     def consider_guard_value(self, op):
-        x = self.make_sure_var_in_reg(op.args[0])
-        y = self.loc(op.args[1])
+        x = self.make_sure_var_in_reg(op.getarg(0))
+        y = self.loc(op.getarg(1))
         self.perform_guard(op, [x, y], None)
-        self.possibly_free_vars(op.args)
+        self.possibly_free_vars_for_op(op)
 
     def consider_guard_class(self, op):
-        assert isinstance(op.args[0], Box)
-        x = self.rm.make_sure_var_in_reg(op.args[0])
-        y = self.loc(op.args[1])
+        assert isinstance(op.getarg(0), Box)
+        x = self.rm.make_sure_var_in_reg(op.getarg(0))
+        y = self.loc(op.getarg(1))
         self.perform_guard(op, [x, y], None)
-        self.rm.possibly_free_vars(op.args)
+        self.rm.possibly_free_vars_for_op(op)
 
     consider_guard_nonnull_class = consider_guard_class
 
     def _consider_binop_part(self, op):
-        x = op.args[0]
-        argloc = self.loc(op.args[1])
-        loc = self.rm.force_result_in_reg(op.result, x, op.args)
-        self.rm.possibly_free_var(op.args[1])
+        x = op.getarg(0)
+        argloc = self.loc(op.getarg(1))
+        args = op.getarglist()
+        loc = self.rm.force_result_in_reg(op.result, x, args)
+        self.rm.possibly_free_var(op.getarg(1))
         return loc, argloc
 
     def _consider_binop(self, op):
@@ -510,26 +519,27 @@
     consider_int_add_ovf = _consider_binop_with_guard
 
     def consider_int_neg(self, op):
-        res = self.rm.force_result_in_reg(op.result, op.args[0])
+        res = self.rm.force_result_in_reg(op.result, op.getarg(0))
         self.Perform(op, [res], res)
 
     consider_int_invert = consider_int_neg
 
     def consider_int_lshift(self, op):
-        if isinstance(op.args[1], Const):
-            loc2 = self.rm.convert_to_imm(op.args[1])
+        if isinstance(op.getarg(1), Const):
+            loc2 = self.rm.convert_to_imm(op.getarg(1))
         else:
-            loc2 = self.rm.make_sure_var_in_reg(op.args[1], selected_reg=ecx)
-        loc1 = self.rm.force_result_in_reg(op.result, op.args[0], op.args)
+            loc2 = self.rm.make_sure_var_in_reg(op.getarg(1), selected_reg=ecx)
+        args = op.getarglist()
+        loc1 = self.rm.force_result_in_reg(op.result, op.getarg(0), args)
         self.Perform(op, [loc1, loc2], loc1)
-        self.rm.possibly_free_vars(op.args)
+        self.rm.possibly_free_vars_for_op(op)
 
     consider_int_rshift  = consider_int_lshift
     consider_uint_rshift = consider_int_lshift
 
     def _consider_int_div_or_mod(self, op, resultreg, trashreg):
-        l0 = self.rm.make_sure_var_in_reg(op.args[0], selected_reg=eax)
-        l1 = self.rm.make_sure_var_in_reg(op.args[1], selected_reg=ecx)
+        l0 = self.rm.make_sure_var_in_reg(op.getarg(0), selected_reg=eax)
+        l1 = self.rm.make_sure_var_in_reg(op.getarg(1), selected_reg=ecx)
         l2 = self.rm.force_allocate_reg(op.result, selected_reg=resultreg)
         # the register (eax or edx) not holding what we are looking for
         # will be just trash after that operation
@@ -538,7 +548,7 @@
         assert l0 is eax
         assert l1 is ecx
         assert l2 is resultreg
-        self.rm.possibly_free_vars(op.args)
+        self.rm.possibly_free_vars_for_op(op)
         self.rm.possibly_free_var(tmpvar)
 
     def consider_int_mod(self, op):
@@ -552,17 +562,18 @@
     consider_uint_floordiv = consider_int_floordiv
 
     def _consider_compop(self, op, guard_op):
-        vx = op.args[0]
-        vy = op.args[1]
+        vx = op.getarg(0)
+        vy = op.getarg(1)
         arglocs = [self.loc(vx), self.loc(vy)]
         if (vx in self.rm.reg_bindings or vy in self.rm.reg_bindings or
             isinstance(vx, Const) or isinstance(vy, Const)):
             pass
         else:
             arglocs[0] = self.rm.make_sure_var_in_reg(vx)
-        self.rm.possibly_free_vars(op.args)
+        args = op.getarglist()
+        self.rm.possibly_free_vars(args)
         if guard_op is None:
-            loc = self.rm.force_allocate_reg(op.result, op.args,
+            loc = self.rm.force_allocate_reg(op.result, args,
                                              need_lower_byte=True)
             self.Perform(op, arglocs, loc)
         else:
@@ -582,10 +593,11 @@
     consider_ptr_ne = _consider_compop
 
     def _consider_float_op(self, op):
-        loc1 = self.xrm.loc(op.args[1])
-        loc0 = self.xrm.force_result_in_reg(op.result, op.args[0], op.args)
+        loc1 = self.xrm.loc(op.getarg(1))
+        args = op.getarglist()
+        loc0 = self.xrm.force_result_in_reg(op.result, op.getarg(0), args)
         self.Perform(op, [loc0, loc1], loc0)
-        self.xrm.possibly_free_vars(op.args)
+        self.xrm.possibly_free_vars_for_op(op)
 
     consider_float_add = _consider_float_op
     consider_float_sub = _consider_float_op
@@ -593,11 +605,12 @@
     consider_float_truediv = _consider_float_op
 
     def _consider_float_cmp(self, op, guard_op):
-        loc0 = self.xrm.make_sure_var_in_reg(op.args[0], op.args,
+        args = op.getarglist()
+        loc0 = self.xrm.make_sure_var_in_reg(op.getarg(0), args,
                                              imm_fine=False)
-        loc1 = self.xrm.loc(op.args[1])
+        loc1 = self.xrm.loc(op.getarg(1))
         arglocs = [loc0, loc1]
-        self.xrm.possibly_free_vars(op.args)
+        self.xrm.possibly_free_vars_for_op(op)
         if guard_op is None:
             res = self.rm.force_allocate_reg(op.result, need_lower_byte=True)
             self.Perform(op, arglocs, res)
@@ -612,26 +625,26 @@
     consider_float_ge = _consider_float_cmp
 
     def consider_float_neg(self, op):
-        loc0 = self.xrm.force_result_in_reg(op.result, op.args[0])
+        loc0 = self.xrm.force_result_in_reg(op.result, op.getarg(0))
         self.Perform(op, [loc0], loc0)
-        self.xrm.possibly_free_var(op.args[0])
+        self.xrm.possibly_free_var(op.getarg(0))
 
     def consider_float_abs(self, op):
-        loc0 = self.xrm.force_result_in_reg(op.result, op.args[0])
+        loc0 = self.xrm.force_result_in_reg(op.result, op.getarg(0))
         self.Perform(op, [loc0], loc0)
-        self.xrm.possibly_free_var(op.args[0])
+        self.xrm.possibly_free_var(op.getarg(0))
 
     def consider_cast_float_to_int(self, op):
-        loc0 = self.xrm.make_sure_var_in_reg(op.args[0], imm_fine=False)
+        loc0 = self.xrm.make_sure_var_in_reg(op.getarg(0), imm_fine=False)
         loc1 = self.rm.force_allocate_reg(op.result)
         self.Perform(op, [loc0], loc1)
-        self.xrm.possibly_free_var(op.args[0])
+        self.xrm.possibly_free_var(op.getarg(0))
 
     def consider_cast_int_to_float(self, op):
-        loc0 = self.rm.loc(op.args[0])
+        loc0 = self.rm.loc(op.getarg(0))
         loc1 = self.xrm.force_allocate_reg(op.result)
         self.Perform(op, [loc0], loc1)
-        self.rm.possibly_free_var(op.args[0])
+        self.rm.possibly_free_var(op.getarg(0))
 
     def _call(self, op, arglocs, force_store=[], guard_not_forced_op=None):
         save_all_regs = guard_not_forced_op is not None
@@ -650,11 +663,11 @@
             self.Perform(op, arglocs, resloc)
 
     def _consider_call(self, op, guard_not_forced_op=None):
-        calldescr = op.descr
+        calldescr = op.getdescr()
         assert isinstance(calldescr, BaseCallDescr)
-        assert len(calldescr.arg_classes) == len(op.args) - 1
+        assert len(calldescr.arg_classes) == op.numargs() - 1
         size = calldescr.get_result_size(self.translate_support_code)
-        self._call(op, [imm(size)] + [self.loc(arg) for arg in op.args],
+        self._call(op, [imm(size)] + [self.loc(op.getarg(i)) for i in range(op.numargs())],
                    guard_not_forced_op=guard_not_forced_op)
 
     def consider_call(self, op):
@@ -665,28 +678,29 @@
         self._consider_call(op, guard_op)
 
     def consider_call_assembler(self, op, guard_op):
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, LoopToken)
         jd = descr.outermost_jitdriver_sd
         assert jd is not None
         size = jd.portal_calldescr.get_result_size(self.translate_support_code)
         vable_index = jd.index_of_virtualizable
         if vable_index >= 0:
-            self.rm._sync_var(op.args[vable_index])
-            vable = self.fm.loc(op.args[vable_index])
+            self.rm._sync_var(op.getarg(vable_index))
+            vable = self.fm.loc(op.getarg(vable_index))
         else:
             vable = imm(0)
         self._call(op, [imm(size), vable] +
-                   [self.loc(arg) for arg in op.args],
+                   [self.loc(op.getarg(i)) for i in range(op.numargs())],
                    guard_not_forced_op=guard_op)
         
     def consider_cond_call_gc_wb(self, op):
         assert op.result is None
-        loc_newvalue = self.rm.make_sure_var_in_reg(op.args[1], op.args)
+        args = op.getarglist()
+        loc_newvalue = self.rm.make_sure_var_in_reg(op.getarg(1), args)
         # ^^^ we force loc_newvalue in a reg (unless it's a Const),
         # because it will be needed anyway by the following setfield_gc.
         # It avoids loading it twice from the memory.
-        loc_base = self.rm.make_sure_var_in_reg(op.args[0], op.args,
+        loc_base = self.rm.make_sure_var_in_reg(op.getarg(0), args,
                                                 imm_fine=False)
         arglocs = [loc_base, loc_newvalue]
         # add eax, ecx and edx as extra "arguments" to ensure they are
@@ -700,7 +714,7 @@
                 and self.rm.stays_alive(v)):
                 arglocs.append(reg)
         self.PerformDiscard(op, arglocs)
-        self.rm.possibly_free_vars(op.args)
+        self.rm.possibly_free_vars_for_op(op)
 
     def _fastpath_malloc(self, op, descr):
         assert isinstance(descr, BaseSizeDescr)
@@ -725,15 +739,15 @@
 
     def consider_new(self, op):
         gc_ll_descr = self.assembler.cpu.gc_ll_descr
-        if gc_ll_descr.can_inline_malloc(op.descr):
-            self._fastpath_malloc(op, op.descr)
+        if gc_ll_descr.can_inline_malloc(op.getdescr()):
+            self._fastpath_malloc(op, op.getdescr())
         else:
-            args = gc_ll_descr.args_for_new(op.descr)
+            args = gc_ll_descr.args_for_new(op.getdescr())
             arglocs = [imm(x) for x in args]
             return self._call(op, arglocs)
 
     def consider_new_with_vtable(self, op):
-        classint = op.args[0].getint()
+        classint = op.getarg(0).getint()
         descrsize = heaptracker.vtable2descr(self.assembler.cpu, classint)
         if self.assembler.cpu.gc_ll_descr.can_inline_malloc(descrsize):
             self._fastpath_malloc(op, descrsize)
@@ -742,34 +756,34 @@
         else:
             args = self.assembler.cpu.gc_ll_descr.args_for_new(descrsize)
             arglocs = [imm(x) for x in args]
-            arglocs.append(self.loc(op.args[0]))
+            arglocs.append(self.loc(op.getarg(0)))
             return self._call(op, arglocs)
 
     def consider_newstr(self, op):
         gc_ll_descr = self.assembler.cpu.gc_ll_descr
         if gc_ll_descr.get_funcptr_for_newstr is not None:
             # framework GC
-            loc = self.loc(op.args[0])
+            loc = self.loc(op.getarg(0))
             return self._call(op, [loc])
         # boehm GC (XXX kill the following code at some point)
         ofs_items, itemsize, ofs = symbolic.get_array_token(rstr.STR, self.translate_support_code)
         assert itemsize == 1
-        return self._malloc_varsize(ofs_items, ofs, 0, op.args[0],
+        return self._malloc_varsize(ofs_items, ofs, 0, op.getarg(0),
                                     op.result)
 
     def consider_newunicode(self, op):
         gc_ll_descr = self.assembler.cpu.gc_ll_descr
         if gc_ll_descr.get_funcptr_for_newunicode is not None:
             # framework GC
-            loc = self.loc(op.args[0])
+            loc = self.loc(op.getarg(0))
             return self._call(op, [loc])
         # boehm GC (XXX kill the following code at some point)
         ofs_items, itemsize, ofs = symbolic.get_array_token(rstr.UNICODE, self.translate_support_code)
         if itemsize == 4:
-            return self._malloc_varsize(ofs_items, ofs, 2, op.args[0],
+            return self._malloc_varsize(ofs_items, ofs, 2, op.getarg(0),
                                         op.result)
         elif itemsize == 2:
-            return self._malloc_varsize(ofs_items, ofs, 1, op.args[0],
+            return self._malloc_varsize(ofs_items, ofs, 1, op.getarg(0),
                                         op.result)
         else:
             assert False, itemsize
@@ -784,7 +798,7 @@
         else:
             tempbox = None
             other_loc = imm(ofs_items + (v.getint() << scale))
-        self._call(ResOperation(rop.NEW, [v], res_v),
+        self._call(ResOperation(rop.NEW, [], res_v),
                    [other_loc], [v])
         loc = self.rm.make_sure_var_in_reg(v, [res_v])
         assert self.loc(res_v) == eax
@@ -792,22 +806,22 @@
         self.rm.possibly_free_var(v)
         if tempbox is not None:
             self.rm.possibly_free_var(tempbox)
-        self.PerformDiscard(ResOperation(rop.SETFIELD_GC, [], None),
+        self.PerformDiscard(ResOperation(rop.SETFIELD_GC, [None, None], None),
                             [eax, imm(ofs_length), imm(WORD), loc])
 
     def consider_new_array(self, op):
         gc_ll_descr = self.assembler.cpu.gc_ll_descr
         if gc_ll_descr.get_funcptr_for_newarray is not None:
             # framework GC
-            args = self.assembler.cpu.gc_ll_descr.args_for_new_array(op.descr)
+            args = self.assembler.cpu.gc_ll_descr.args_for_new_array(op.getdescr())
             arglocs = [imm(x) for x in args]
-            arglocs.append(self.loc(op.args[0]))
+            arglocs.append(self.loc(op.getarg(0)))
             return self._call(op, arglocs)
         # boehm GC (XXX kill the following code at some point)
         scale_of_field, basesize, ofs_length, _ = (
-            self._unpack_arraydescr(op.descr))
+            self._unpack_arraydescr(op.getdescr()))
         return self._malloc_varsize(basesize, ofs_length, scale_of_field,
-                                    op.args[0], op.result)
+                                    op.getarg(0), op.result)
 
     def _unpack_arraydescr(self, arraydescr):
         assert isinstance(arraydescr, BaseArrayDescr)
@@ -829,50 +843,54 @@
         return imm(ofs), imm(size), ptr
 
     def consider_setfield_gc(self, op):
-        ofs_loc, size_loc, ptr = self._unpack_fielddescr(op.descr)
+        ofs_loc, size_loc, ptr = self._unpack_fielddescr(op.getdescr())
         assert isinstance(size_loc, ImmedLoc)
         if size_loc.value == 1:
             need_lower_byte = True
         else:
             need_lower_byte = False
-        base_loc = self.rm.make_sure_var_in_reg(op.args[0], op.args)
-        value_loc = self.make_sure_var_in_reg(op.args[1], op.args,
+        args = op.getarglist()
+        base_loc = self.rm.make_sure_var_in_reg(op.getarg(0), args)
+        value_loc = self.make_sure_var_in_reg(op.getarg(1), args,
                                               need_lower_byte=need_lower_byte)
-        self.possibly_free_vars(op.args)
+        self.possibly_free_vars(args)
         self.PerformDiscard(op, [base_loc, ofs_loc, size_loc, value_loc])
 
     consider_setfield_raw = consider_setfield_gc
 
     def consider_strsetitem(self, op):
-        base_loc = self.rm.make_sure_var_in_reg(op.args[0], op.args)
-        ofs_loc = self.rm.make_sure_var_in_reg(op.args[1], op.args)
-        value_loc = self.rm.make_sure_var_in_reg(op.args[2], op.args,
+        args = op.getarglist()
+        base_loc = self.rm.make_sure_var_in_reg(op.getarg(0), args)
+        ofs_loc = self.rm.make_sure_var_in_reg(op.getarg(1), args)
+        value_loc = self.rm.make_sure_var_in_reg(op.getarg(2), args,
                                                  need_lower_byte=True)
-        self.rm.possibly_free_vars(op.args)
+        self.rm.possibly_free_vars_for_op(op)
         self.PerformDiscard(op, [base_loc, ofs_loc, value_loc])
 
     consider_unicodesetitem = consider_strsetitem
 
     def consider_setarrayitem_gc(self, op):
-        scale, ofs, _, ptr = self._unpack_arraydescr(op.descr)
-        base_loc  = self.rm.make_sure_var_in_reg(op.args[0], op.args)
+        scale, ofs, _, ptr = self._unpack_arraydescr(op.getdescr())
+        args = op.getarglist()
+        base_loc  = self.rm.make_sure_var_in_reg(op.getarg(0), args)
         if scale == 0:
             need_lower_byte = True
         else:
             need_lower_byte = False
-        value_loc = self.make_sure_var_in_reg(op.args[2], op.args,
+        value_loc = self.make_sure_var_in_reg(op.getarg(2), args,
                                           need_lower_byte=need_lower_byte)
-        ofs_loc = self.rm.make_sure_var_in_reg(op.args[1], op.args)
-        self.possibly_free_vars(op.args)
+        ofs_loc = self.rm.make_sure_var_in_reg(op.getarg(1), args)
+        self.possibly_free_vars(args)
         self.PerformDiscard(op, [base_loc, ofs_loc, value_loc,
                                  imm(scale), imm(ofs)])
 
     consider_setarrayitem_raw = consider_setarrayitem_gc
 
     def consider_getfield_gc(self, op):
-        ofs_loc, size_loc, _ = self._unpack_fielddescr(op.descr)
-        base_loc = self.rm.make_sure_var_in_reg(op.args[0], op.args)
-        self.rm.possibly_free_vars(op.args)
+        ofs_loc, size_loc, _ = self._unpack_fielddescr(op.getdescr())
+        args = op.getarglist()
+        base_loc = self.rm.make_sure_var_in_reg(op.getarg(0), args)
+        self.rm.possibly_free_vars(args)
         result_loc = self.force_allocate_reg(op.result)
         self.Perform(op, [base_loc, ofs_loc, size_loc], result_loc)
 
@@ -881,10 +899,11 @@
     consider_getfield_gc_pure = consider_getfield_gc
 
     def consider_getarrayitem_gc(self, op):
-        scale, ofs, _, _ = self._unpack_arraydescr(op.descr)
-        base_loc = self.rm.make_sure_var_in_reg(op.args[0], op.args)
-        ofs_loc = self.rm.make_sure_var_in_reg(op.args[1], op.args)
-        self.rm.possibly_free_vars(op.args)
+        scale, ofs, _, _ = self._unpack_arraydescr(op.getdescr())
+        args = op.getarglist()
+        base_loc = self.rm.make_sure_var_in_reg(op.getarg(0), args)
+        ofs_loc = self.rm.make_sure_var_in_reg(op.getarg(1), args)
+        self.rm.possibly_free_vars_for_op(op)
         result_loc = self.force_allocate_reg(op.result)
         self.Perform(op, [base_loc, ofs_loc, imm(scale), imm(ofs)], result_loc)
 
@@ -893,8 +912,8 @@
 
     def consider_int_is_true(self, op, guard_op):
         # doesn't need arg to be in a register
-        argloc = self.loc(op.args[0])
-        self.rm.possibly_free_var(op.args[0])
+        argloc = self.loc(op.getarg(0))
+        self.rm.possibly_free_var(op.getarg(0))
         if guard_op is not None:
             self.perform_with_guard(op, guard_op, [argloc], None)
         else:
@@ -904,33 +923,36 @@
     consider_int_is_zero = consider_int_is_true
 
     def consider_same_as(self, op):
-        argloc = self.loc(op.args[0])
-        self.possibly_free_var(op.args[0])
+        argloc = self.loc(op.getarg(0))
+        self.possibly_free_var(op.getarg(0))
         resloc = self.force_allocate_reg(op.result)
         self.Perform(op, [argloc], resloc)
     #consider_cast_ptr_to_int = consider_same_as
 
     def consider_strlen(self, op):
-        base_loc = self.rm.make_sure_var_in_reg(op.args[0], op.args)
-        self.rm.possibly_free_vars(op.args)
+        args = op.getarglist()
+        base_loc = self.rm.make_sure_var_in_reg(op.getarg(0), args)
+        self.rm.possibly_free_vars_for_op(op)
         result_loc = self.rm.force_allocate_reg(op.result)
         self.Perform(op, [base_loc], result_loc)
 
     consider_unicodelen = consider_strlen
 
     def consider_arraylen_gc(self, op):
-        arraydescr = op.descr
+        arraydescr = op.getdescr()
         assert isinstance(arraydescr, BaseArrayDescr)
         ofs = arraydescr.get_ofs_length(self.translate_support_code)
-        base_loc = self.rm.make_sure_var_in_reg(op.args[0], op.args)
-        self.rm.possibly_free_vars(op.args)
+        args = op.getarglist()
+        base_loc = self.rm.make_sure_var_in_reg(op.getarg(0), args)
+        self.rm.possibly_free_vars_for_op(op)
         result_loc = self.rm.force_allocate_reg(op.result)
         self.Perform(op, [base_loc, imm(ofs)], result_loc)
 
     def consider_strgetitem(self, op):
-        base_loc = self.rm.make_sure_var_in_reg(op.args[0], op.args)
-        ofs_loc = self.rm.make_sure_var_in_reg(op.args[1], op.args)
-        self.rm.possibly_free_vars(op.args)
+        args = op.getarglist()
+        base_loc = self.rm.make_sure_var_in_reg(op.getarg(0), args)
+        ofs_loc = self.rm.make_sure_var_in_reg(op.getarg(1), args)
+        self.rm.possibly_free_vars_for_op(op)
         result_loc = self.rm.force_allocate_reg(op.result)
         self.Perform(op, [base_loc, ofs_loc], result_loc)
 
@@ -939,7 +961,7 @@
     def consider_jump(self, op):
         assembler = self.assembler
         assert self.jump_target_descr is None
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, LoopToken)
         self.jump_target_descr = descr
         nonfloatlocs, floatlocs = assembler.target_arglocs(self.jump_target_descr)
@@ -951,17 +973,20 @@
         xmmtmp = X86XMMRegisterManager.all_regs[0]
         xmmtmploc = self.xrm.force_allocate_reg(box1, selected_reg=xmmtmp)
         # Part about non-floats
-        src_locations = [self.loc(arg) for arg in op.args if arg.type != FLOAT]
+        # XXX we don't need a copy, we only just the original list
+        src_locations = [self.loc(op.getarg(i)) for i in range(op.numargs()) 
+                         if op.getarg(i).type != FLOAT]
         assert tmploc not in nonfloatlocs
         dst_locations = [loc for loc in nonfloatlocs if loc is not None]
         remap_frame_layout(assembler, src_locations, dst_locations, tmploc)
         # Part about floats
-        src_locations = [self.loc(arg) for arg in op.args if arg.type == FLOAT]
+        src_locations = [self.loc(op.getarg(i)) for i in range(op.numargs()) 
+                         if op.getarg(i).type == FLOAT]
         dst_locations = [loc for loc in floatlocs if loc is not None]
         remap_frame_layout(assembler, src_locations, dst_locations, xmmtmp)
         self.rm.possibly_free_var(box)
         self.xrm.possibly_free_var(box1)
-        self.possibly_free_vars(op.args)
+        self.possibly_free_vars_for_op(op)
         assembler.closing_jump(self.jump_target_descr)
 
     def consider_debug_merge_point(self, op):
@@ -1002,12 +1027,21 @@
 def add_none_argument(fn):
     return lambda self, op: fn(self, op, None)
 
+def is_comparison_or_ovf_op(opnum):
+    from pypy.jit.metainterp.resoperation import opclasses, AbstractResOp
+    cls = opclasses[opnum]
+    # hack hack: in theory they are instance method, but they don't use
+    # any instance field, we can use a fake object
+    class Fake(cls):
+        pass
+    op = Fake(None)
+    return op.is_comparison() or op.is_ovf()
+
 for name, value in RegAlloc.__dict__.iteritems():
     if name.startswith('consider_'):
         name = name[len('consider_'):]
         num = getattr(rop, name.upper())
-        if (ResOperation(num, [], None).is_comparison()
-            or ResOperation(num, [], None).is_ovf()
+        if (is_comparison_or_ovf_op(num)
             or num == rop.CALL_MAY_FORCE or num == rop.CALL_ASSEMBLER):
             oplist_with_guard[num] = value
             oplist[num] = add_none_argument(value)

Modified: pypy/trunk/pypy/jit/backend/x86/test/test_recompilation.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/x86/test/test_recompilation.py	(original)
+++ pypy/trunk/pypy/jit/backend/x86/test/test_recompilation.py	Wed Sep 22 14:17:16 2010
@@ -47,7 +47,7 @@
         finish(i3, i4, i5, i6, i7, i8, i9, descr=fdescr2)
         '''
         bridge = self.attach_bridge(ops, loop, -2)
-        descr = loop.operations[2].descr
+        descr = loop.operations[2].getdescr()
         new = descr._x86_bridge_frame_depth
         assert descr._x86_bridge_param_depth == 0        
         # XXX: Maybe add enough ops to force stack on 64-bit as well?
@@ -114,8 +114,8 @@
         assert loop.token._x86_param_depth == 0
         # XXX: Maybe add enough ops to force stack on 64-bit as well?
         if IS_X86_32:
-            assert guard_op.descr._x86_bridge_frame_depth > loop_frame_depth
-        assert guard_op.descr._x86_bridge_param_depth == 0
+            assert guard_op.getdescr()._x86_bridge_frame_depth > loop_frame_depth
+        assert guard_op.getdescr()._x86_bridge_param_depth == 0
         self.cpu.set_future_value_int(0, 0)
         self.cpu.set_future_value_int(1, 0)
         self.cpu.set_future_value_int(2, 0)

Modified: pypy/trunk/pypy/jit/backend/x86/test/test_regalloc.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/x86/test/test_regalloc.py	(original)
+++ pypy/trunk/pypy/jit/backend/x86/test/test_regalloc.py	Wed Sep 22 14:17:16 2010
@@ -9,7 +9,7 @@
 from pypy.jit.backend.llsupport.descr import GcCache
 from pypy.jit.backend.detect_cpu import getcpuclass
 from pypy.jit.backend.x86.regalloc import RegAlloc, X86RegisterManager,\
-     FloatConstants
+     FloatConstants, is_comparison_or_ovf_op
 from pypy.jit.backend.x86.arch import IS_X86_32, IS_X86_64
 from pypy.jit.metainterp.test.oparser import parse
 from pypy.rpython.lltypesystem import lltype, llmemory, rffi
@@ -17,6 +17,11 @@
 from pypy.rpython.lltypesystem import rclass, rstr
 from pypy.jit.backend.x86.rx86 import *
 
+def test_is_comparison_or_ovf_op():
+    assert not is_comparison_or_ovf_op(rop.INT_ADD)
+    assert is_comparison_or_ovf_op(rop.INT_ADD_OVF)
+    assert is_comparison_or_ovf_op(rop.INT_EQ)
+
 CPU = getcpuclass()
 class MockGcDescr(GcCache):
     def get_funcptr_for_new(self):
@@ -159,8 +164,8 @@
         assert guard_op.is_guard()
         bridge = self.parse(ops, **kwds)
         assert ([box.type for box in bridge.inputargs] ==
-                [box.type for box in guard_op.fail_args])
-        faildescr = guard_op.descr
+                [box.type for box in guard_op.getfailargs()])
+        faildescr = guard_op.getdescr()
         self.cpu.compile_bridge(faildescr, bridge.inputargs, bridge.operations)
         return bridge
 
@@ -607,7 +612,7 @@
         '''
         bridge = self.attach_bridge(ops, loop, -2)
 
-        assert loop.operations[-2].descr._x86_bridge_param_depth == self.expected_param_depth(2)
+        assert loop.operations[-2].getdescr()._x86_bridge_param_depth == self.expected_param_depth(2)
 
         self.cpu.set_future_value_int(0, 4)
         self.cpu.set_future_value_int(1, 7)        
@@ -630,7 +635,7 @@
         '''
         bridge = self.attach_bridge(ops, loop, -2)
 
-        assert loop.operations[-2].descr._x86_bridge_param_depth == self.expected_param_depth(2)
+        assert loop.operations[-2].getdescr()._x86_bridge_param_depth == self.expected_param_depth(2)
 
         self.cpu.set_future_value_int(0, 4)
         self.cpu.set_future_value_int(1, 7)        

Modified: pypy/trunk/pypy/jit/backend/x86/test/test_runner.py
==============================================================================
--- pypy/trunk/pypy/jit/backend/x86/test/test_runner.py	(original)
+++ pypy/trunk/pypy/jit/backend/x86/test/test_runner.py	Wed Sep 22 14:17:16 2010
@@ -265,7 +265,7 @@
                         ResOperation(rop.FINISH, [ConstInt(0)], None,
                                      descr=BasicFailDescr()),
                         ]
-                    ops[-2].fail_args = [i1]
+                    ops[-2].setfailargs([i1])
                     looptoken = LoopToken()
                     self.cpu.compile_loop([b], ops, looptoken)
                     if op == rop.INT_IS_TRUE:
@@ -314,7 +314,7 @@
                         ResOperation(rop.FINISH, [ConstInt(0)], None,
                                      descr=BasicFailDescr()),
                         ]
-                    ops[-2].fail_args = [i1]
+                    ops[-2].setfailargs([i1])
                     inputargs = [i for i in (a, b) if isinstance(i, Box)]
                     looptoken = LoopToken()
                     self.cpu.compile_loop(inputargs, ops, looptoken)
@@ -353,7 +353,7 @@
             ResOperation(rop.JUMP, [i1], None, descr=looptoken),
             ]
         inputargs = [i0]
-        operations[3].fail_args = [i1]
+        operations[3].setfailargs([i1])
         self.cpu.compile_loop(inputargs, operations, looptoken)
         name, loopaddress, loopsize = agent.functions[0]
         assert name == "Loop # 0: hello"
@@ -368,7 +368,7 @@
             ResOperation(rop.DEBUG_MERGE_POINT, [FakeString("bye")], None),
             ResOperation(rop.JUMP, [i1b], None, descr=looptoken),
         ]
-        bridge[1].fail_args = [i1b]
+        bridge[1].setfailargs([i1b])
 
         self.cpu.compile_bridge(faildescr1, [i1b], bridge)        
         name, address, size = agent.functions[1]
@@ -462,7 +462,7 @@
                 cmp_result = BoxInt()
                 ops.append(ResOperation(float_op, args, cmp_result))
                 ops.append(ResOperation(guard_op, [cmp_result], None, descr=BasicFailDescr()))
-                ops[-1].fail_args = [failed]
+                ops[-1].setfailargs([failed])
 
             ops.append(ResOperation(rop.FINISH, [finished], None, descr=BasicFailDescr()))
 

Modified: pypy/trunk/pypy/jit/metainterp/compile.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/compile.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/compile.py	Wed Sep 22 14:17:16 2010
@@ -51,7 +51,7 @@
 def compile_new_loop(metainterp, old_loop_tokens, greenkey, start):
     """Try to compile a new loop by closing the current history back
     to the first operation.
-    """    
+    """
     history = metainterp.history
     loop = create_empty_loop(metainterp)
     loop.greenkey = greenkey
@@ -65,7 +65,7 @@
     jitdriver_sd = metainterp.jitdriver_sd
     loop_token = make_loop_token(len(loop.inputargs), jitdriver_sd)
     loop.token = loop_token
-    loop.operations[-1].descr = loop_token     # patch the target of the JUMP
+    loop.operations[-1].setdescr(loop_token)     # patch the target of the JUMP
     try:
         old_loop_token = jitdriver_sd.warmstate.optimize_loop(
             metainterp_sd, old_loop_tokens, loop)
@@ -133,7 +133,7 @@
     metainterp_sd.profiler.end_backend()
     if not we_are_translated():
         metainterp_sd.stats.compiled()
-    metainterp_sd.log("compiled new bridge")            
+    metainterp_sd.log("compiled new bridge")
 
 # ____________________________________________________________
 
@@ -177,7 +177,7 @@
 
 class TerminatingLoopToken(LoopToken):
     terminating = True
-    
+
     def __init__(self, nargs, finishdescr):
         self.specnodes = [prebuiltNotSpecNode]*nargs
         self.finishdescr = finishdescr
@@ -233,14 +233,14 @@
         self.metainterp_sd = metainterp_sd
 
     def store_final_boxes(self, guard_op, boxes):
-        guard_op.fail_args = boxes
-        self.guard_opnum = guard_op.opnum
+        guard_op.setfailargs(boxes)
+        self.guard_opnum = guard_op.getopnum()
 
     def make_a_counter_per_value(self, guard_value_op):
-        assert guard_value_op.opnum == rop.GUARD_VALUE
-        box = guard_value_op.args[0]
+        assert guard_value_op.getopnum() == rop.GUARD_VALUE
+        box = guard_value_op.getarg(0)
         try:
-            i = guard_value_op.fail_args.index(box)
+            i = guard_value_op.getfailargs().index(box)
         except ValueError:
             return     # xxx probably very rare
         else:
@@ -508,7 +508,7 @@
 def compile_new_bridge(metainterp, old_loop_tokens, resumekey):
     """Try to compile a new bridge leading from the beginning of the history
     to some existing place.
-    """    
+    """
     # The history contains new operations to attach as the code for the
     # failure of 'resumekey.guard_op'.
     #
@@ -540,13 +540,14 @@
     op = new_loop.operations[-1]
     if not isinstance(target_loop_token, TerminatingLoopToken):
         # normal case
-        op.descr = target_loop_token     # patch the jump target
+        op.setdescr(target_loop_token)     # patch the jump target
     else:
         # The target_loop_token is a pseudo loop token,
         # e.g. loop_tokens_done_with_this_frame_void[0]
         # Replace the operation with the real operation we want, i.e. a FINISH
         descr = target_loop_token.finishdescr
-        new_op = ResOperation(rop.FINISH, op.args, None, descr=descr)
+        args = op.getarglist()
+        new_op = ResOperation(rop.FINISH, args, None, descr=descr)
         new_loop.operations[-1] = new_op
 
 # ____________________________________________________________
@@ -597,6 +598,6 @@
         ResOperation(rop.GUARD_NO_EXCEPTION, [], None, descr=faildescr),
         ResOperation(rop.FINISH, finishargs, None, descr=jd.portal_finishtoken)
         ]
-    operations[1].fail_args = []
+    operations[1].setfailargs([])
     cpu.compile_loop(inputargs, operations, loop_token)
     return loop_token

Modified: pypy/trunk/pypy/jit/metainterp/graphpage.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/graphpage.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/graphpage.py	Wed Sep 22 14:17:16 2010
@@ -17,13 +17,13 @@
     for graph, highlight in graphs:
         for op in graph.get_operations():
             if is_interesting_guard(op):
-                graphs.append((SubGraph(op.descr._debug_suboperations),
+                graphs.append((SubGraph(op.getdescr()._debug_suboperations),
                                highlight))
     graphpage = ResOpGraphPage(graphs, errmsg)
     graphpage.display()
 
 def is_interesting_guard(op):
-    return hasattr(op.descr, '_debug_suboperations')
+    return hasattr(op.getdescr(), '_debug_suboperations')
 
 
 class ResOpGraphPage(GraphPage):
@@ -76,7 +76,7 @@
             for i, op in enumerate(graph.get_operations()):
                 if is_interesting_guard(op):
                     self.mark_starter(graphindex, i+1)
-                if op.opnum == rop.DEBUG_MERGE_POINT:
+                if op.getopnum() == rop.DEBUG_MERGE_POINT:
                     if not last_was_mergepoint:
                         last_was_mergepoint = True
                         self.mark_starter(graphindex, i)
@@ -155,7 +155,7 @@
             op = operations[opindex]
             lines.append(repr(op))
             if is_interesting_guard(op):
-                tgt = op.descr._debug_suboperations[0]
+                tgt = op.getdescr()._debug_suboperations[0]
                 tgt_g, tgt_i = self.all_operations[tgt]
                 self.genedge((graphindex, opstartindex),
                              (tgt_g, tgt_i),
@@ -167,8 +167,8 @@
                 self.genedge((graphindex, opstartindex),
                              (graphindex, opindex))
                 break
-        if op.opnum == rop.JUMP:
-            tgt = op.descr
+        if op.getopnum() == rop.JUMP:
+            tgt = op.getdescr()
             tgt_g = -1
             if tgt is None:
                 tgt_g = graphindex
@@ -191,7 +191,9 @@
     def getlinks(self):
         boxes = {}
         for op in self.all_operations:
-            for box in op.args + [op.result]:
+            args = op.getarglist()
+            args.append(op.result)
+            for box in args:
                 if getattr(box, 'is_box', False):
                     boxes[box] = True
         links = {}

Modified: pypy/trunk/pypy/jit/metainterp/history.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/history.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/history.py	Wed Sep 22 14:17:16 2010
@@ -532,7 +532,7 @@
 class BoxFloat(Box):
     type = FLOAT
     _attrs_ = ('value',)
-    
+
     def __init__(self, floatval=0.0):
         assert isinstance(floatval, float)
         self.value = floatval
@@ -759,33 +759,34 @@
         assert len(seen) == len(inputargs), (
                "duplicate Box in the Loop.inputargs")
         TreeLoop.check_consistency_of_branch(operations, seen)
-        
+
     @staticmethod
     def check_consistency_of_branch(operations, seen):
         "NOT_RPYTHON"
         for op in operations:
-            for box in op.args:
+            for i in range(op.numargs()):
+                box = op.getarg(i)
                 if isinstance(box, Box):
                     assert box in seen
             if op.is_guard():
-                assert op.descr is not None
-                if hasattr(op.descr, '_debug_suboperations'):
-                    ops = op.descr._debug_suboperations
+                assert op.getdescr() is not None
+                if hasattr(op.getdescr(), '_debug_suboperations'):
+                    ops = op.getdescr()._debug_suboperations
                     TreeLoop.check_consistency_of_branch(ops, seen.copy())
-                for box in op.fail_args or []:
+                for box in op.getfailargs() or []:
                     if box is not None:
                         assert isinstance(box, Box)
                         assert box in seen
             else:
-                assert op.fail_args is None
+                assert op.getfailargs() is None
             box = op.result
             if box is not None:
                 assert isinstance(box, Box)
                 assert box not in seen
                 seen[box] = True
         assert operations[-1].is_final()
-        if operations[-1].opnum == rop.JUMP:
-            target = operations[-1].descr
+        if operations[-1].getopnum() == rop.JUMP:
+            target = operations[-1].getdescr()
             if target is not None:
                 assert isinstance(target, LoopToken)
 
@@ -793,7 +794,8 @@
         # RPython-friendly
         print '%r: inputargs =' % self, self._dump_args(self.inputargs)
         for op in self.operations:
-            print '\t', op.getopname(), self._dump_args(op.args), \
+            args = op.getarglist()
+            print '\t', op.getopname(), self._dump_args(args), \
                   self._dump_box(op.result)
 
     def _dump_args(self, boxes):
@@ -809,14 +811,14 @@
         return '<%s>' % (self.name,)
 
 def _list_all_operations(result, operations, omit_finish=True):
-    if omit_finish and operations[-1].opnum == rop.FINISH:
+    if omit_finish and operations[-1].getopnum() == rop.FINISH:
         # xxx obscure
         return
     result.extend(operations)
     for op in operations:
-        if op.is_guard() and op.descr:
-            if hasattr(op.descr, '_debug_suboperations'):
-                ops = op.descr._debug_suboperations
+        if op.is_guard() and op.getdescr():
+            if hasattr(op.getdescr(), '_debug_suboperations'):
+                ops = op.getdescr()._debug_suboperations
                 _list_all_operations(result, ops, omit_finish)
 
 # ____________________________________________________________
@@ -885,7 +887,7 @@
         self.aborted_count += 1
 
     def entered(self):
-        self.enter_count += 1        
+        self.enter_count += 1
 
     def compiled(self):
         self.compiled_count += 1
@@ -898,7 +900,7 @@
 
     def add_new_loop(self, loop):
         self.loops.append(loop)
-        
+
     # test read interface
 
     def get_all_loops(self):

Modified: pypy/trunk/pypy/jit/metainterp/logger.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/logger.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/logger.py	Wed Sep 22 14:17:16 2010
@@ -79,27 +79,27 @@
             debug_print('[' + args + ']')
         for i in range(len(operations)):
             op = operations[i]
-            if op.opnum == rop.DEBUG_MERGE_POINT:
-                loc = op.args[0]._get_str()
+            if op.getopnum() == rop.DEBUG_MERGE_POINT:
+                loc = op.getarg(0)._get_str()
                 debug_print("debug_merge_point('%s')" % (loc,))
                 continue
-            args = ", ".join([self.repr_of_arg(memo, arg) for arg in op.args])
+            args = ", ".join([self.repr_of_arg(memo, op.getarg(i)) for i in range(op.numargs())])
             if op.result is not None:
                 res = self.repr_of_arg(memo, op.result) + " = "
             else:
                 res = ""
             is_guard = op.is_guard()
-            if op.descr is not None:
-                descr = op.descr
+            if op.getdescr() is not None:
+                descr = op.getdescr()
                 if is_guard and self.guard_number:
                     index = self.metainterp_sd.cpu.get_fail_descr_number(descr)
                     r = "<Guard%d>" % index
                 else:
                     r = self.repr_of_descr(descr)
                 args += ', descr=' +  r
-            if is_guard and op.fail_args is not None:
+            if is_guard and op.getfailargs() is not None:
                 fail_args = ' [' + ", ".join([self.repr_of_arg(memo, arg)
-                                              for arg in op.fail_args]) + ']'
+                                              for arg in op.getfailargs()]) + ']'
             else:
                 fail_args = ''
             debug_print(res + op.getopname() +

Modified: pypy/trunk/pypy/jit/metainterp/optimize.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/optimize.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/optimize.py	Wed Sep 22 14:17:16 2010
@@ -43,7 +43,7 @@
     finder.find_nodes_bridge(bridge)
     for old_loop_token in old_loop_tokens:
         if finder.bridge_matches(old_loop_token.specnodes):
-            bridge.operations[-1].descr = old_loop_token   # patch jump target
+            bridge.operations[-1].setdescr(old_loop_token)   # patch jump target
             optimize_bridge_1(metainterp_sd, bridge)
             return old_loop_token
     return None

Modified: pypy/trunk/pypy/jit/metainterp/optimizefindnode.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/optimizefindnode.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/optimizefindnode.py	Wed Sep 22 14:17:16 2010
@@ -144,7 +144,7 @@
 
     def find_nodes(self, operations):
         for op in operations:
-            opnum = op.opnum
+            opnum = op.getopnum()
             for value, func in find_nodes_ops:
                 if opnum == value:
                     func(self, op)
@@ -154,18 +154,20 @@
 
     def find_nodes_default(self, op):
         if op.is_always_pure():
-            for arg in op.args:
+            for i in range(op.numargs()):
+                arg = op.getarg(i)
                 if self.get_constant_box(arg) is None:
                     break
             else:
                 # all constant arguments: we can constant-fold
-                argboxes = [self.get_constant_box(arg) for arg in op.args]
+                argboxes = [self.get_constant_box(op.getarg(i))
+                            for i in range(op.numargs())]
                 resbox = execute_nonspec(self.cpu, None,
-                                         op.opnum, argboxes, op.descr)
+                                         op.getopnum(), argboxes, op.getdescr())
                 self.set_constant_node(op.result, resbox.constbox())
         # default case: mark the arguments as escaping
-        for box in op.args:
-            self.getnode(box).mark_escaped()
+        for i in range(op.numargs()):
+            self.getnode(op.getarg(i)).mark_escaped()
 
     def find_nodes_no_escape(self, op):
         pass    # for operations that don't escape their arguments
@@ -178,53 +180,53 @@
 
     def find_nodes_NEW_WITH_VTABLE(self, op):
         instnode = InstanceNode()
-        box = op.args[0]
+        box = op.getarg(0)
         assert isinstance(box, Const)
         instnode.knownclsbox = box
         self.nodes[op.result] = instnode
 
     def find_nodes_NEW(self, op):
         instnode = InstanceNode()
-        instnode.structdescr = op.descr
+        instnode.structdescr = op.getdescr()
         self.nodes[op.result] = instnode
 
     def find_nodes_NEW_ARRAY(self, op):
-        lengthbox = op.args[0]
+        lengthbox = op.getarg(0)
         lengthbox = self.get_constant_box(lengthbox)
         if lengthbox is None:
             return     # var-sized arrays are not virtual
         arraynode = InstanceNode()
         arraynode.arraysize = lengthbox.getint()
-        arraynode.arraydescr = op.descr
+        arraynode.arraydescr = op.getdescr()
         self.nodes[op.result] = arraynode
 
     def find_nodes_ARRAYLEN_GC(self, op):
-        arraynode = self.getnode(op.args[0])
+        arraynode = self.getnode(op.getarg(0))
         if arraynode.arraydescr is not None:
             resbox = ConstInt(arraynode.arraysize)
             self.set_constant_node(op.result, resbox)
 
     def find_nodes_GUARD_CLASS(self, op):
-        instnode = self.getnode(op.args[0])
+        instnode = self.getnode(op.getarg(0))
         if instnode.fromstart:    # only useful (and safe) in this case
-            box = op.args[1]
+            box = op.getarg(1)
             assert isinstance(box, Const)
             instnode.knownclsbox = box
 
     def find_nodes_GUARD_VALUE(self, op):
-        instnode = self.getnode(op.args[0])
+        instnode = self.getnode(op.getarg(0))
         if instnode.fromstart:    # only useful (and safe) in this case
-            box = op.args[1]
+            box = op.getarg(1)
             assert isinstance(box, Const)
             instnode.knownvaluebox = box
 
     def find_nodes_SETFIELD_GC(self, op):
-        instnode = self.getnode(op.args[0])
-        fieldnode = self.getnode(op.args[1])
+        instnode = self.getnode(op.getarg(0))
+        fieldnode = self.getnode(op.getarg(1))
         if instnode.escaped:
             fieldnode.mark_escaped()
             return     # nothing to be gained from tracking the field
-        field = op.descr
+        field = op.getdescr()
         assert isinstance(field, AbstractValue)
         if instnode.curfields is None:
             instnode.curfields = {}
@@ -232,10 +234,10 @@
         instnode.add_escape_dependency(fieldnode)
 
     def find_nodes_GETFIELD_GC(self, op):
-        instnode = self.getnode(op.args[0])
+        instnode = self.getnode(op.getarg(0))
         if instnode.escaped:
             return     # nothing to be gained from tracking the field
-        field = op.descr
+        field = op.getdescr()
         assert isinstance(field, AbstractValue)
         if instnode.curfields is not None and field in instnode.curfields:
             fieldnode = instnode.curfields[field]
@@ -254,13 +256,13 @@
     find_nodes_GETFIELD_GC_PURE = find_nodes_GETFIELD_GC
 
     def find_nodes_SETARRAYITEM_GC(self, op):
-        indexbox = op.args[1]
+        indexbox = op.getarg(1)
         indexbox = self.get_constant_box(indexbox)
         if indexbox is None:
             self.find_nodes_default(op)            # not a Const index
             return
-        arraynode = self.getnode(op.args[0])
-        itemnode = self.getnode(op.args[2])
+        arraynode = self.getnode(op.getarg(0))
+        itemnode = self.getnode(op.getarg(2))
         if arraynode.escaped:
             itemnode.mark_escaped()
             return     # nothing to be gained from tracking the item
@@ -270,12 +272,12 @@
         arraynode.add_escape_dependency(itemnode)
 
     def find_nodes_GETARRAYITEM_GC(self, op):
-        indexbox = op.args[1]
+        indexbox = op.getarg(1)
         indexbox = self.get_constant_box(indexbox)
         if indexbox is None:
             self.find_nodes_default(op)            # not a Const index
             return
-        arraynode = self.getnode(op.args[0])
+        arraynode = self.getnode(op.getarg(0))
         if arraynode.escaped:
             return     # nothing to be gained from tracking the item
         index = indexbox.getint()
@@ -298,13 +300,15 @@
     def find_nodes_JUMP(self, op):
         # only set up the 'unique' field of the InstanceNodes;
         # real handling comes later (build_result_specnodes() for loops).
-        for box in op.args:
+        for i in range(op.numargs()):
+            box = op.getarg(i)
             self.getnode(box).set_unique_nodes()
 
     def find_nodes_FINISH(self, op):
         # only for bridges, and only for the ones that end in a 'return'
         # or 'raise'; all other cases end with a JUMP.
-        for box in op.args:
+        for i in range(op.numargs()):
+            box = op.getarg(i)
             self.getnode(box).unique = UNIQUE_NO
 
 find_nodes_ops = _findall(NodeFinder, 'find_nodes_')
@@ -324,7 +328,7 @@
     def show(self):
         from pypy.jit.metainterp.viewnode import viewnodes, view
         op = self._loop.operations[-1]
-        assert op.opnum == rop.JUMP
+        assert op.getopnum() == rop.JUMP
         exitnodes = [self.getnode(arg) for arg in op.args]
         viewnodes(self.inputnodes, exitnodes)
         if hasattr(self._loop.token, "specnodes"):
@@ -343,14 +347,14 @@
         # Build the list of specnodes based on the result
         # computed by NodeFinder.find_nodes().
         op = loop.operations[-1]
-        assert op.opnum == rop.JUMP
-        assert len(self.inputnodes) == len(op.args)
+        assert op.getopnum() == rop.JUMP
+        assert len(self.inputnodes) == op.numargs()
         while True:
             self.restart_needed = False
             specnodes = []
-            for i in range(len(op.args)):
+            for i in range(op.numargs()):
                 inputnode = self.inputnodes[i]
-                exitnode = self.getnode(op.args[i])
+                exitnode = self.getnode(op.getarg(i))
                 specnodes.append(self.intersect(inputnode, exitnode))
             if not self.restart_needed:
                 break
@@ -562,9 +566,9 @@
 
     def bridge_matches(self, nextloop_specnodes):
         jump_op = self.jump_op
-        assert len(jump_op.args) == len(nextloop_specnodes)
+        assert jump_op.numargs() == len(nextloop_specnodes)
         for i in range(len(nextloop_specnodes)):
-            exitnode = self.getnode(jump_op.args[i])
+            exitnode = self.getnode(jump_op.getarg(i))
             if not nextloop_specnodes[i].matches_instance_node(exitnode):
                 return False
         return True

Modified: pypy/trunk/pypy/jit/metainterp/optimizeopt/heap.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/optimizeopt/heap.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/optimizeopt/heap.py	Wed Sep 22 14:17:16 2010
@@ -45,7 +45,7 @@
             op = self.lazy_setfields.get(descr, None)
             if op is None:
                 return None
-            return self.getvalue(op.args[1])
+            return self.getvalue(op.getarg(1))
         return d.get(value, None)
 
     def cache_arrayitem_value(self, descr, value, indexvalue, fieldvalue, write=False):
@@ -105,7 +105,7 @@
         if op.is_guard():
             self.optimizer.pendingfields = self.force_lazy_setfields_for_guard()
             return
-        opnum = op.opnum
+        opnum = op.getopnum()
         if (opnum == rop.SETFIELD_GC or
             opnum == rop.SETARRAYITEM_GC or
             opnum == rop.DEBUG_MERGE_POINT):
@@ -117,7 +117,7 @@
             if opnum == rop.CALL_ASSEMBLER:
                 effectinfo = None
             else:
-                effectinfo = op.descr.get_extra_info()
+                effectinfo = op.getdescr().get_extra_info()
             if effectinfo is not None:
                 # XXX we can get the wrong complexity here, if the lists
                 # XXX stored on effectinfo are large
@@ -142,7 +142,7 @@
                 return
             self.force_all_lazy_setfields()
         elif op.is_final() or (not we_are_translated() and
-                               op.opnum < 0):   # escape() operations
+                               op.getopnum() < 0):   # escape() operations
             self.force_all_lazy_setfields()
         self.clean_caches()
 
@@ -166,10 +166,11 @@
             # - is_comparison() for cases like "int_eq/setfield_gc/guard_true"
             # - CALL_MAY_FORCE: "call_may_force/setfield_gc/guard_not_forced"
             # - is_ovf(): "int_add_ovf/setfield_gc/guard_no_overflow"
-            opnum = prevop.opnum
+            opnum = prevop.getopnum()
+            lastop_args = lastop.getarglist()
             if ((prevop.is_comparison() or opnum == rop.CALL_MAY_FORCE
                  or prevop.is_ovf())
-                and prevop.result not in lastop.args):
+                and prevop.result not in lastop_args):
                 newoperations[-2] = lastop
                 newoperations[-1] = prevop
 
@@ -189,9 +190,9 @@
             # the only really interesting case that we need to handle in the
             # guards' resume data is that of a virtual object that is stored
             # into a field of a non-virtual object.
-            value = self.getvalue(op.args[0])
+            value = self.getvalue(op.getarg(0))
             assert not value.is_virtual()      # it must be a non-virtual
-            fieldvalue = self.getvalue(op.args[1])
+            fieldvalue = self.getvalue(op.getarg(1))
             if fieldvalue.is_virtual():
                 # this is the case that we leave to resume.py
                 pendingfields.append((descr, value.box,
@@ -202,20 +203,20 @@
 
     def force_lazy_setfield_if_necessary(self, op, value, write=False):
         try:
-            op1 = self.lazy_setfields[op.descr]
+            op1 = self.lazy_setfields[op.getdescr()]
         except KeyError:
             if write:
-                self.lazy_setfields_descrs.append(op.descr)
+                self.lazy_setfields_descrs.append(op.getdescr())
         else:
-            if self.getvalue(op1.args[0]) is not value:
-                self.force_lazy_setfield(op.descr)
+            if self.getvalue(op1.getarg(0)) is not value:
+                self.force_lazy_setfield(op.getdescr())
 
     def optimize_GETFIELD_GC(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         self.force_lazy_setfield_if_necessary(op, value)
         # check if the field was read from another getfield_gc just before
         # or has been written to recently
-        fieldvalue = self.read_cached_field(op.descr, value)
+        fieldvalue = self.read_cached_field(op.getdescr(), value)
         if fieldvalue is not None:
             self.make_equal_to(op.result, fieldvalue)
             return
@@ -225,38 +226,38 @@
         self.emit_operation(op) # FIXME: These might need constant propagation?
         # then remember the result of reading the field
         fieldvalue = self.getvalue(op.result)
-        self.cache_field_value(op.descr, value, fieldvalue)
+        self.cache_field_value(op.getdescr(), value, fieldvalue)
 
     def optimize_SETFIELD_GC(self, op):
-        value = self.getvalue(op.args[0])
-        fieldvalue = self.getvalue(op.args[1])
+        value = self.getvalue(op.getarg(0))
+        fieldvalue = self.getvalue(op.getarg(1))
         self.force_lazy_setfield_if_necessary(op, value, write=True)
-        self.lazy_setfields[op.descr] = op
+        self.lazy_setfields[op.getdescr()] = op
         # remember the result of future reads of the field
-        self.cache_field_value(op.descr, value, fieldvalue, write=True)
+        self.cache_field_value(op.getdescr(), value, fieldvalue, write=True)
 
     def optimize_GETARRAYITEM_GC(self, op):
-        value = self.getvalue(op.args[0])
-        indexvalue = self.getvalue(op.args[1])
-        fieldvalue = self.read_cached_arrayitem(op.descr, value, indexvalue)
+        value = self.getvalue(op.getarg(0))
+        indexvalue = self.getvalue(op.getarg(1))
+        fieldvalue = self.read_cached_arrayitem(op.getdescr(), value, indexvalue)
         if fieldvalue is not None:
             self.make_equal_to(op.result, fieldvalue)
             return
         ###self.optimizer.optimize_default(op)
         self.emit_operation(op) # FIXME: These might need constant propagation?
         fieldvalue = self.getvalue(op.result)
-        self.cache_arrayitem_value(op.descr, value, indexvalue, fieldvalue)
+        self.cache_arrayitem_value(op.getdescr(), value, indexvalue, fieldvalue)
 
     def optimize_SETARRAYITEM_GC(self, op):
         self.emit_operation(op)
-        value = self.getvalue(op.args[0])
-        fieldvalue = self.getvalue(op.args[2])
-        indexvalue = self.getvalue(op.args[1])
-        self.cache_arrayitem_value(op.descr, value, indexvalue, fieldvalue,
+        value = self.getvalue(op.getarg(0))
+        fieldvalue = self.getvalue(op.getarg(2))
+        indexvalue = self.getvalue(op.getarg(1))
+        self.cache_arrayitem_value(op.getdescr(), value, indexvalue, fieldvalue,
                                    write=True)
 
     def propagate_forward(self, op):
-        opnum = op.opnum
+        opnum = op.getopnum()
         for value, func in optimize_ops:
             if opnum == value:
                 func(self, op)

Modified: pypy/trunk/pypy/jit/metainterp/optimizeopt/intbounds.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/optimizeopt/intbounds.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/optimizeopt/intbounds.py	Wed Sep 22 14:17:16 2010
@@ -10,7 +10,7 @@
        remove redundant guards"""
 
     def propagate_forward(self, op):
-        opnum = op.opnum
+        opnum = op.getopnum()
         for value, func in optimize_ops:
             if opnum == value:
                 func(self, op)
@@ -31,7 +31,7 @@
             op = self.optimizer.producer[box]
         except KeyError:
             return
-        opnum = op.opnum
+        opnum = op.getopnum()
         for value, func in propagate_bounds_ops:
             if opnum == value:
                 func(self, op)
@@ -39,14 +39,14 @@
 
     def optimize_GUARD_TRUE(self, op):
         self.emit_operation(op)
-        self.propagate_bounds_backward(op.args[0])
+        self.propagate_bounds_backward(op.getarg(0))
 
     optimize_GUARD_FALSE = optimize_GUARD_TRUE
     optimize_GUARD_VALUE = optimize_GUARD_TRUE
 
     def optimize_INT_AND(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         self.emit_operation(op)
 
         r = self.getvalue(op.result)
@@ -60,74 +60,74 @@
                 r.intbound.intersect(IntBound(0,val))
 
     def optimize_INT_SUB(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         self.emit_operation(op)
         r = self.getvalue(op.result)
         r.intbound.intersect(v1.intbound.sub_bound(v2.intbound))
 
     def optimize_INT_ADD(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         self.emit_operation(op)
         r = self.getvalue(op.result)
         r.intbound.intersect(v1.intbound.add_bound(v2.intbound))
 
     def optimize_INT_MUL(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         self.emit_operation(op)
         r = self.getvalue(op.result)
         r.intbound.intersect(v1.intbound.mul_bound(v2.intbound))
 
     def optimize_INT_ADD_OVF(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         resbound = v1.intbound.add_bound(v2.intbound)
         if resbound.has_lower and resbound.has_upper and \
-           self.nextop().opnum == rop.GUARD_NO_OVERFLOW:
+           self.nextop().getopnum() == rop.GUARD_NO_OVERFLOW:
             # Transform into INT_ADD and remove guard
-            op.opnum = rop.INT_ADD
+            op = op.copy_and_change(rop.INT_ADD)
             self.skip_nextop()
-            self.optimize_INT_ADD(op)
+            self.optimize_INT_ADD(op) # emit the op
         else:
             self.emit_operation(op)
             r = self.getvalue(op.result)
             r.intbound.intersect(resbound)
 
     def optimize_INT_SUB_OVF(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         resbound = v1.intbound.sub_bound(v2.intbound)
         if resbound.has_lower and resbound.has_upper and \
-               self.nextop().opnum == rop.GUARD_NO_OVERFLOW:
+               self.nextop().getopnum() == rop.GUARD_NO_OVERFLOW:
             # Transform into INT_SUB and remove guard
-            op.opnum = rop.INT_SUB
+            op = op.copy_and_change(rop.INT_SUB)
             self.skip_nextop()
-            self.optimize_INT_SUB(op)
+            self.optimize_INT_SUB(op) # emit the op
         else:
             self.emit_operation(op)
             r = self.getvalue(op.result)
             r.intbound.intersect(resbound)
 
     def optimize_INT_MUL_OVF(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         resbound = v1.intbound.mul_bound(v2.intbound)
         if resbound.has_lower and resbound.has_upper and \
-               self.nextop().opnum == rop.GUARD_NO_OVERFLOW:
+               self.nextop().getopnum() == rop.GUARD_NO_OVERFLOW:
             # Transform into INT_MUL and remove guard
-            op.opnum = rop.INT_MUL
+            op = op.copy_and_change(rop.INT_MUL)
             self.skip_nextop()
-            self.optimize_INT_MUL(op)
+            self.optimize_INT_MUL(op) # emit the op
         else:
             self.emit_operation(op)
             r = self.getvalue(op.result)
             r.intbound.intersect(resbound)
 
     def optimize_INT_LT(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v1.intbound.known_lt(v2.intbound):
             self.make_constant_int(op.result, 1)
         elif v1.intbound.known_ge(v2.intbound):
@@ -136,8 +136,8 @@
             self.emit_operation(op)
 
     def optimize_INT_GT(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v1.intbound.known_gt(v2.intbound):
             self.make_constant_int(op.result, 1)
         elif v1.intbound.known_le(v2.intbound):
@@ -146,8 +146,8 @@
             self.emit_operation(op)
 
     def optimize_INT_LE(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v1.intbound.known_le(v2.intbound):
             self.make_constant_int(op.result, 1)
         elif v1.intbound.known_gt(v2.intbound):
@@ -156,8 +156,8 @@
             self.emit_operation(op)
 
     def optimize_INT_GE(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v1.intbound.known_ge(v2.intbound):
             self.make_constant_int(op.result, 1)
         elif v1.intbound.known_lt(v2.intbound):
@@ -166,8 +166,8 @@
             self.emit_operation(op)
 
     def optimize_INT_EQ(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v1.intbound.known_gt(v2.intbound):
             self.make_constant_int(op.result, 0)
         elif v1.intbound.known_lt(v2.intbound):
@@ -176,8 +176,8 @@
             self.emit_operation(op)
 
     def optimize_INT_NE(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v1.intbound.known_gt(v2.intbound):
             self.make_constant_int(op.result, 1)
         elif v1.intbound.known_lt(v2.intbound):
@@ -192,115 +192,114 @@
 
     optimize_STRLEN = optimize_ARRAYLEN_GC
 
-    def make_int_lt(self, args):
-        v1 = self.getvalue(args[0])
-        v2 = self.getvalue(args[1])
+    def make_int_lt(self, box1, box2):
+        v1 = self.getvalue(box1)
+        v2 = self.getvalue(box2)
         if v1.intbound.make_lt(v2.intbound):
-            self.propagate_bounds_backward(args[0])
+            self.propagate_bounds_backward(box1)
         if v2.intbound.make_gt(v1.intbound):
-            self.propagate_bounds_backward(args[1])
+            self.propagate_bounds_backward(box2)
 
-
-    def make_int_le(self, args):
-        v1 = self.getvalue(args[0])
-        v2 = self.getvalue(args[1])
+    def make_int_le(self, box1, box2):
+        v1 = self.getvalue(box1)
+        v2 = self.getvalue(box2)
         if v1.intbound.make_le(v2.intbound):
-            self.propagate_bounds_backward(args[0])
+            self.propagate_bounds_backward(box1)
         if v2.intbound.make_ge(v1.intbound):
-            self.propagate_bounds_backward(args[1])
+            self.propagate_bounds_backward(box2)
 
-    def make_int_gt(self, args):
-        self.make_int_lt([args[1], args[0]])
+    def make_int_gt(self, box1, box2):
+        self.make_int_lt(box2, box1)
 
-    def make_int_ge(self, args):
-        self.make_int_le([args[1], args[0]])
+    def make_int_ge(self, box1, box2):
+        self.make_int_le(box2, box1)
 
     def propagate_bounds_INT_LT(self, op):
         r = self.getvalue(op.result)
         if r.is_constant():
             if r.box.same_constant(CONST_1):
-                self.make_int_lt(op.args)
+                self.make_int_lt(op.getarg(0), op.getarg(1))
             else:
-                self.make_int_ge(op.args)
+                self.make_int_ge(op.getarg(0), op.getarg(1))
 
     def propagate_bounds_INT_GT(self, op):
         r = self.getvalue(op.result)
         if r.is_constant():
             if r.box.same_constant(CONST_1):
-                self.make_int_gt(op.args)
+                self.make_int_gt(op.getarg(0), op.getarg(1))
             else:
-                self.make_int_le(op.args)
+                self.make_int_le(op.getarg(0), op.getarg(1))
 
     def propagate_bounds_INT_LE(self, op):
         r = self.getvalue(op.result)
         if r.is_constant():
             if r.box.same_constant(CONST_1):
-                self.make_int_le(op.args)
+                self.make_int_le(op.getarg(0), op.getarg(1))
             else:
-                self.make_int_gt(op.args)
+                self.make_int_gt(op.getarg(0), op.getarg(1))
 
     def propagate_bounds_INT_GE(self, op):
         r = self.getvalue(op.result)
         if r.is_constant():
             if r.box.same_constant(CONST_1):
-                self.make_int_ge(op.args)
+                self.make_int_ge(op.getarg(0), op.getarg(1))
             else:
-                self.make_int_lt(op.args)
+                self.make_int_lt(op.getarg(0), op.getarg(1))
 
     def propagate_bounds_INT_EQ(self, op):
         r = self.getvalue(op.result)
         if r.is_constant():
             if r.box.same_constant(CONST_1):
-                v1 = self.getvalue(op.args[0])
-                v2 = self.getvalue(op.args[1])
+                v1 = self.getvalue(op.getarg(0))
+                v2 = self.getvalue(op.getarg(1))
                 if v1.intbound.intersect(v2.intbound):
-                    self.propagate_bounds_backward(op.args[0])
+                    self.propagate_bounds_backward(op.getarg(0))
                 if v2.intbound.intersect(v1.intbound):
-                    self.propagate_bounds_backward(op.args[1])
+                    self.propagate_bounds_backward(op.getarg(1))
 
     def propagate_bounds_INT_NE(self, op):
         r = self.getvalue(op.result)
         if r.is_constant():
             if r.box.same_constant(CONST_0):
-                v1 = self.getvalue(op.args[0])
-                v2 = self.getvalue(op.args[1])
+                v1 = self.getvalue(op.getarg(0))
+                v2 = self.getvalue(op.getarg(1))
                 if v1.intbound.intersect(v2.intbound):
-                    self.propagate_bounds_backward(op.args[0])
+                    self.propagate_bounds_backward(op.getarg(0))
                 if v2.intbound.intersect(v1.intbound):
-                    self.propagate_bounds_backward(op.args[1])
+                    self.propagate_bounds_backward(op.getarg(1))
 
     def propagate_bounds_INT_ADD(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         r = self.getvalue(op.result)
         b = r.intbound.sub_bound(v2.intbound)
         if v1.intbound.intersect(b):
-            self.propagate_bounds_backward(op.args[0])
+            self.propagate_bounds_backward(op.getarg(0))
         b = r.intbound.sub_bound(v1.intbound)
         if v2.intbound.intersect(b):
-            self.propagate_bounds_backward(op.args[1])
+            self.propagate_bounds_backward(op.getarg(1))
 
     def propagate_bounds_INT_SUB(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         r = self.getvalue(op.result)
         b = r.intbound.add_bound(v2.intbound)
         if v1.intbound.intersect(b):
-            self.propagate_bounds_backward(op.args[0])
+            self.propagate_bounds_backward(op.getarg(0))
         b = r.intbound.sub_bound(v1.intbound).mul(-1)
         if v2.intbound.intersect(b):
-            self.propagate_bounds_backward(op.args[1])
+            self.propagate_bounds_backward(op.getarg(1))
 
     def propagate_bounds_INT_MUL(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         r = self.getvalue(op.result)
         b = r.intbound.div_bound(v2.intbound)
         if v1.intbound.intersect(b):
-            self.propagate_bounds_backward(op.args[0])
+            self.propagate_bounds_backward(op.getarg(0))
         b = r.intbound.div_bound(v1.intbound)
         if v2.intbound.intersect(b):
-            self.propagate_bounds_backward(op.args[1])
+            self.propagate_bounds_backward(op.getarg(1))
 
     propagate_bounds_INT_ADD_OVF  = propagate_bounds_INT_ADD
     propagate_bounds_INT_SUB_OVF  = propagate_bounds_INT_SUB

Modified: pypy/trunk/pypy/jit/metainterp/optimizeopt/optimizer.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/optimizeopt/optimizer.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/optimizeopt/optimizer.py	Wed Sep 22 14:17:16 2010
@@ -16,12 +16,12 @@
 LEVEL_UNKNOWN    = '\x00'
 LEVEL_NONNULL    = '\x01'
 LEVEL_KNOWNCLASS = '\x02'     # might also mean KNOWNARRAYDESCR, for arrays
-LEVEL_CONSTANT   = '\x03'        
+LEVEL_CONSTANT   = '\x03'
 
 import sys
 MAXINT = sys.maxint
 MININT = -sys.maxint - 1
-        
+
 class OptValue(object):
     _attrs_ = ('box', 'known_class', 'last_guard_index', 'level', 'intbound')
     last_guard_index = -1
@@ -36,7 +36,7 @@
         if isinstance(box, Const):
             self.make_constant(box)
         # invariant: box is a Const if and only if level == LEVEL_CONSTANT
-        
+
     def force_box(self):
         return self.box
 
@@ -171,7 +171,7 @@
 
     def new_const_item(self, arraydescr):
         return self.optimizer.new_const_item(arraydescr)
-    
+
     def pure(self, opnum, args, result):
         op = ResOperation(opnum, args, result)
         self.optimizer.pure_operations[self.optimizer.make_args_key(op)] = op
@@ -184,7 +184,7 @@
 
     def setup(self, virtuals):
         pass
-    
+
 class Optimizer(Optimization):
 
     def __init__(self, metainterp_sd, loop, optimizations=None, virtuals=True):
@@ -308,7 +308,7 @@
 
     def propagate_forward(self, op):
         self.producer[op.result] = op
-        opnum = op.opnum
+        opnum = op.getopnum()
         for value, func in optimize_ops:
             if opnum == value:
                 func(self, op)
@@ -323,15 +323,15 @@
         self._emit_operation(op)
 
     def _emit_operation(self, op):
-        for i in range(len(op.args)):
-            arg = op.args[i]
+        for i in range(op.numargs()):
+            arg = op.getarg(i)
             if arg in self.values:
                 box = self.values[arg].force_box()
-                op.args[i] = box
+                op.setarg(i, box)
         self.metainterp_sd.profiler.count(jitprof.OPT_OPS)
         if op.is_guard():
             self.metainterp_sd.profiler.count(jitprof.OPT_GUARDS)
-            self.store_final_boxes_in_guard(op)
+            op = self.store_final_boxes_in_guard(op)
         elif op.can_raise():
             self.exception_might_have_happened = True
         elif op.returns_bool_result():
@@ -340,7 +340,7 @@
 
     def store_final_boxes_in_guard(self, op):
         ###pendingfields = self.heap_op_optimizer.force_lazy_setfields_for_guard()
-        descr = op.descr
+        descr = op.getdescr()
         assert isinstance(descr, compile.ResumeGuardDescr)
         modifier = resume.ResumeDataVirtualAdder(descr, self.resumedata_memo)
         newboxes = modifier.finish(self.values, self.pendingfields)
@@ -348,49 +348,54 @@
             compile.giveup()
         descr.store_final_boxes(op, newboxes)
         #
-        if op.opnum == rop.GUARD_VALUE:
-            if self.getvalue(op.args[0]) in self.bool_boxes:
+        if op.getopnum() == rop.GUARD_VALUE:
+            if self.getvalue(op.getarg(0)) in self.bool_boxes:
                 # Hack: turn guard_value(bool) into guard_true/guard_false.
                 # This is done after the operation is emitted to let
                 # store_final_boxes_in_guard set the guard_opnum field of the
                 # descr to the original rop.GUARD_VALUE.
-                constvalue = op.args[1].getint()
+                constvalue = op.getarg(1).getint()
                 if constvalue == 0:
                     opnum = rop.GUARD_FALSE
                 elif constvalue == 1:
                     opnum = rop.GUARD_TRUE
                 else:
                     raise AssertionError("uh?")
-                op.opnum = opnum
-                op.args = [op.args[0]]
+                newop = ResOperation(opnum, [op.getarg(0)], op.result, descr)
+                newop.setfailargs(op.getfailargs())
+                return newop
             else:
                 # a real GUARD_VALUE.  Make it use one counter per value.
                 descr.make_a_counter_per_value(op)
+        return op
 
     def make_args_key(self, op):
-        args = op.args[:]
-        for i in range(len(args)):
-            arg = args[i]
+        args = []
+        for i in range(op.numargs()):
+            arg = op.getarg(i)
             if arg in self.values:
-                args[i] = self.values[arg].get_key_box()
-        args.append(ConstInt(op.opnum))
+                args.append(self.values[arg].get_key_box())
+            else:
+                args.append(arg)
+        args.append(ConstInt(op.getopnum()))
         return args
-            
+
     def optimize_default(self, op):
         canfold = op.is_always_pure()
         is_ovf = op.is_ovf()
         if is_ovf:
             nextop = self.loop.operations[self.i + 1]
-            canfold = nextop.opnum == rop.GUARD_NO_OVERFLOW
+            canfold = nextop.getopnum() == rop.GUARD_NO_OVERFLOW
         if canfold:
-            for arg in op.args:
-                if self.get_constant_box(arg) is None:
+            for i in range(op.numargs()):
+                if self.get_constant_box(op.getarg(i)) is None:
                     break
             else:
                 # all constant arguments: constant-fold away
-                argboxes = [self.get_constant_box(arg) for arg in op.args]
+                argboxes = [self.get_constant_box(op.getarg(i))
+                            for i in range(op.numargs())]
                 resbox = execute_nonspec(self.cpu, None,
-                                         op.opnum, argboxes, op.descr)
+                                         op.getopnum(), argboxes, op.getdescr())
                 self.make_constant(op.result, resbox.constbox())
                 if is_ovf:
                     self.i += 1 # skip next operation, it is the unneeded guard
@@ -399,8 +404,8 @@
             # did we do the exact same operation already?
             args = self.make_args_key(op)
             oldop = self.pure_operations.get(args, None)
-            if oldop is not None and oldop.descr is op.descr:
-                assert oldop.opnum == op.opnum
+            if oldop is not None and oldop.getdescr() is op.getdescr():
+                assert oldop.getopnum() == op.getopnum()
                 self.make_equal_to(op.result, self.getvalue(oldop.result))
                 if is_ovf:
                     self.i += 1 # skip next operation, it is the unneeded guard

Modified: pypy/trunk/pypy/jit/metainterp/optimizeopt/rewrite.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/optimizeopt/rewrite.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/optimizeopt/rewrite.py	Wed Sep 22 14:17:16 2010
@@ -14,7 +14,7 @@
         if self.find_rewritable_bool(op, args):
             return
 
-        opnum = op.opnum
+        opnum = op.getopnum()
         for value, func in optimize_ops:
             if opnum == value:
                 func(self, op)
@@ -24,7 +24,7 @@
         
     def try_boolinvers(self, op, targs):
         oldop = self.optimizer.pure_operations.get(targs, None)
-        if oldop is not None and oldop.descr is op.descr:
+        if oldop is not None and oldop.getdescr() is op.getdescr():
             value = self.getvalue(oldop.result)
             if value.is_constant():
                 if value.box.same_constant(CONST_1):
@@ -39,7 +39,7 @@
 
     def find_rewritable_bool(self, op, args):
         try:
-            oldopnum = opboolinvers[op.opnum]
+            oldopnum = opboolinvers[op.getopnum()]
             targs = [args[0], args[1], ConstInt(oldopnum)]
             if self.try_boolinvers(op, targs):
                 return True
@@ -47,17 +47,17 @@
             pass
 
         try:
-            oldopnum = opboolreflex[op.opnum] # FIXME: add INT_ADD, INT_MUL
+            oldopnum = opboolreflex[op.getopnum()] # FIXME: add INT_ADD, INT_MUL
             targs = [args[1], args[0], ConstInt(oldopnum)]
             oldop = self.optimizer.pure_operations.get(targs, None)
-            if oldop is not None and oldop.descr is op.descr:
+            if oldop is not None and oldop.getdescr() is op.getdescr():
                 self.make_equal_to(op.result, self.getvalue(oldop.result))
                 return True
         except KeyError:
             pass
 
         try:
-            oldopnum = opboolinvers[opboolreflex[op.opnum]]
+            oldopnum = opboolinvers[opboolreflex[op.getopnum()]]
             targs = [args[1], args[0], ConstInt(oldopnum)]
             if self.try_boolinvers(op, targs):
                 return True
@@ -67,16 +67,16 @@
         return False
 
     def optimize_INT_AND(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v1.is_null() or v2.is_null():
             self.make_constant_int(op.result, 0)
         else:
             self.emit_operation(op)
 
     def optimize_INT_OR(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v1.is_null():
             self.make_equal_to(op.result, v2)
         elif v2.is_null():
@@ -85,20 +85,20 @@
             self.emit_operation(op)
 
     def optimize_INT_SUB(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
         if v2.is_constant() and v2.box.getint() == 0:
             self.make_equal_to(op.result, v1)
         else:
             self.emit_operation(op)
 
         # Synthesize the reverse ops for optimize_default to reuse
-        self.pure(rop.INT_ADD, [op.result, op.args[1]], op.args[0])
-        self.pure(rop.INT_SUB, [op.args[0], op.result], op.args[1])
+        self.pure(rop.INT_ADD, [op.result, op.getarg(1)], op.getarg(0))
+        self.pure(rop.INT_SUB, [op.getarg(0), op.result], op.getarg(1))
 
     def optimize_INT_ADD(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
 
         # If one side of the op is 0 the result is the other side.
         if v1.is_constant() and v1.box.getint() == 0:
@@ -109,12 +109,12 @@
             self.emit_operation(op)
 
         # Synthesize the reverse op for optimize_default to reuse
-        self.pure(rop.INT_SUB, [op.result, op.args[1]], op.args[0])
-        self.pure(rop.INT_SUB, [op.result, op.args[0]], op.args[1])
+        self.pure(rop.INT_SUB, [op.result, op.getarg(1)], op.getarg(0))
+        self.pure(rop.INT_SUB, [op.result, op.getarg(0)], op.getarg(1))
 
     def optimize_INT_MUL(self, op):
-        v1 = self.getvalue(op.args[0])
-        v2 = self.getvalue(op.args[1])
+        v1 = self.getvalue(op.getarg(0))
+        v2 = self.getvalue(op.getarg(1))
 
         # If one side of the op is 1 the result is the other side.
         if v1.is_constant() and v1.box.getint() == 1:
@@ -128,18 +128,20 @@
             self.emit_operation(op)
 
     def optimize_CALL_PURE(self, op):
-        for arg in op.args:
+        for i in range(op.numargs()):
+            arg = op.getarg(i)
             if self.get_constant_box(arg) is None:
                 break
         else:
             # all constant arguments: constant-fold away
-            self.make_constant(op.result, op.args[0])
+            self.make_constant(op.result, op.getarg(0))
             return
         # replace CALL_PURE with just CALL
-        self.emit_operation(ResOperation(rop.CALL, op.args[1:], op.result,
-                                         op.descr))
+        args = op.getarglist()[1:]
+        self.emit_operation(ResOperation(rop.CALL, args, op.result,
+                                         op.getdescr()))
     def optimize_guard(self, op, constbox, emit_operation=True):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         if value.is_constant():
             box = value.box
             assert isinstance(box, Const)
@@ -151,7 +153,7 @@
         value.make_constant(constbox)
 
     def optimize_GUARD_ISNULL(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         if value.is_null():
             return
         elif value.is_nonnull():
@@ -160,7 +162,7 @@
         value.make_constant(self.optimizer.cpu.ts.CONST_NULL)
 
     def optimize_GUARD_NONNULL(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         if value.is_nonnull():
             return
         elif value.is_null():
@@ -169,25 +171,25 @@
         value.make_nonnull(len(self.optimizer.newoperations) - 1)
 
     def optimize_GUARD_VALUE(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         emit_operation = True
         if value.last_guard_index != -1:
             # there already has been a guard_nonnull or guard_class or
             # guard_nonnull_class on this value, which is rather silly.
             # replace the original guard with a guard_value
             old_guard_op = self.optimizer.newoperations[value.last_guard_index]
-            old_opnum = old_guard_op.opnum
-            old_guard_op.opnum = rop.GUARD_VALUE
-            old_guard_op.args = [old_guard_op.args[0], op.args[1]]
+            new_guard_op = old_guard_op.copy_and_change(rop.GUARD_VALUE,
+                                             args = [old_guard_op.getarg(0), op.getarg(1)])
+            self.optimizer.newoperations[value.last_guard_index] = new_guard_op
             # hack hack hack.  Change the guard_opnum on
-            # old_guard_op.descr so that when resuming,
+            # new_guard_op.getdescr() so that when resuming,
             # the operation is not skipped by pyjitpl.py.
-            descr = old_guard_op.descr
+            descr = new_guard_op.getdescr()
             assert isinstance(descr, compile.ResumeGuardDescr)
             descr.guard_opnum = rop.GUARD_VALUE
-            descr.make_a_counter_per_value(old_guard_op)
+            descr.make_a_counter_per_value(new_guard_op)
             emit_operation = False
-        constbox = op.args[1]
+        constbox = op.getarg(1)
         assert isinstance(constbox, Const)
         self.optimize_guard(op, constbox, emit_operation)
 
@@ -198,8 +200,8 @@
         self.optimize_guard(op, CONST_0)
 
     def optimize_GUARD_CLASS(self, op):
-        value = self.getvalue(op.args[0])
-        expectedclassbox = op.args[1]
+        value = self.getvalue(op.getarg(0))
+        expectedclassbox = op.getarg(1)
         assert isinstance(expectedclassbox, Const)
         realclassbox = value.get_constant_class(self.optimizer.cpu)
         if realclassbox is not None:
@@ -213,15 +215,16 @@
             # there already has been a guard_nonnull or guard_class or
             # guard_nonnull_class on this value.
             old_guard_op = self.optimizer.newoperations[value.last_guard_index]
-            if old_guard_op.opnum == rop.GUARD_NONNULL:
+            if old_guard_op.getopnum() == rop.GUARD_NONNULL:
                 # it was a guard_nonnull, which we replace with a
                 # guard_nonnull_class.
-                old_guard_op.opnum = rop.GUARD_NONNULL_CLASS
-                old_guard_op.args = [old_guard_op.args[0], op.args[1]]
+                new_guard_op = old_guard_op.copy_and_change (rop.GUARD_NONNULL_CLASS,
+                                         args = [old_guard_op.getarg(0), op.getarg(1)])
+                self.optimizer.newoperations[value.last_guard_index] = new_guard_op
                 # hack hack hack.  Change the guard_opnum on
-                # old_guard_op.descr so that when resuming,
+                # new_guard_op.getdescr() so that when resuming,
                 # the operation is not skipped by pyjitpl.py.
-                descr = old_guard_op.descr
+                descr = new_guard_op.getdescr()
                 assert isinstance(descr, compile.ResumeGuardDescr)
                 descr.guard_opnum = rop.GUARD_NONNULL_CLASS
                 emit_operation = False
@@ -239,18 +242,18 @@
         self.optimizer.exception_might_have_happened = False
 
     def optimize_CALL_LOOPINVARIANT(self, op):
-        funcvalue = self.getvalue(op.args[0])
+        funcvalue = self.getvalue(op.getarg(0))
         if not funcvalue.is_constant():
             self.emit_operation(op)
             return
-        key = make_hashable_int(op.args[0].getint())
+        key = make_hashable_int(op.getarg(0).getint())
         resvalue = self.optimizer.loop_invariant_results.get(key, None)
         if resvalue is not None:
             self.make_equal_to(op.result, resvalue)
             return
         # change the op to be a normal call, from the backend's point of view
         # there is no reason to have a separate operation for this
-        op.opnum = rop.CALL
+        op = op.copy_and_change(rop.CALL)
         self.emit_operation(op)
         resvalue = self.getvalue(op.result)
         self.optimizer.loop_invariant_results[key] = resvalue
@@ -265,17 +268,17 @@
             self.emit_operation(op)
 
     def optimize_INT_IS_TRUE(self, op):
-        if self.getvalue(op.args[0]) in self.optimizer.bool_boxes:
-            self.make_equal_to(op.result, self.getvalue(op.args[0]))
+        if self.getvalue(op.getarg(0)) in self.optimizer.bool_boxes:
+            self.make_equal_to(op.result, self.getvalue(op.getarg(0)))
             return
-        self._optimize_nullness(op, op.args[0], True)
+        self._optimize_nullness(op, op.getarg(0), True)
 
     def optimize_INT_IS_ZERO(self, op):
-        self._optimize_nullness(op, op.args[0], False)
+        self._optimize_nullness(op, op.getarg(0), False)
 
     def _optimize_oois_ooisnot(self, op, expect_isnot):
-        value0 = self.getvalue(op.args[0])
-        value1 = self.getvalue(op.args[1])
+        value0 = self.getvalue(op.getarg(0))
+        value1 = self.getvalue(op.getarg(1))
         if value0.is_virtual():
             if value1.is_virtual():
                 intres = (value0 is value1) ^ expect_isnot
@@ -285,9 +288,9 @@
         elif value1.is_virtual():
             self.make_constant_int(op.result, expect_isnot)
         elif value1.is_null():
-            self._optimize_nullness(op, op.args[0], expect_isnot)
+            self._optimize_nullness(op, op.getarg(0), expect_isnot)
         elif value0.is_null():
-            self._optimize_nullness(op, op.args[1], expect_isnot)
+            self._optimize_nullness(op, op.getarg(1), expect_isnot)
         elif value0 is value1:
             self.make_constant_int(op.result, not expect_isnot)
         else:
@@ -308,10 +311,10 @@
         self._optimize_oois_ooisnot(op, False)
 
     def optimize_INSTANCEOF(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         realclassbox = value.get_constant_class(self.optimizer.cpu)
         if realclassbox is not None:
-            checkclassbox = self.optimizer.cpu.typedescr2classbox(op.descr)
+            checkclassbox = self.optimizer.cpu.typedescr2classbox(op.getdescr())
             result = self.optimizer.cpu.ts.subclassOf(self.optimizer.cpu,
                                                       realclassbox, 
                                                       checkclassbox)

Modified: pypy/trunk/pypy/jit/metainterp/optimizeopt/virtualize.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/optimizeopt/virtualize.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/optimizeopt/virtualize.py	Wed Sep 22 14:17:16 2010
@@ -258,7 +258,7 @@
     def setup(self, virtuals):
         if not virtuals:
             return
-        
+
         inputargs = self.optimizer.loop.inputargs
         specnodes = self.optimizer.loop.token.specnodes
         assert len(inputargs) == len(specnodes)
@@ -285,18 +285,18 @@
     def optimize_JUMP(self, op):
         orgop = self.optimizer.loop.operations[-1]
         exitargs = []
-        target_loop_token = orgop.descr
+        target_loop_token = orgop.getdescr()
         assert isinstance(target_loop_token, LoopToken)
         specnodes = target_loop_token.specnodes
-        assert len(op.args) == len(specnodes)
+        assert op.numargs() == len(specnodes)
         for i in range(len(specnodes)):
-            value = self.getvalue(op.args[i])
+            value = self.getvalue(op.getarg(i))
             specnodes[i].teardown_virtual_node(self, value, exitargs)
-        op.args = exitargs[:]
+        op = op.copy_and_change(op.getopnum(), args=exitargs[:])
         self.emit_operation(op)
 
     def optimize_VIRTUAL_REF(self, op):
-        indexbox = op.args[1]
+        indexbox = op.getarg(1)
         #
         # get some constants
         vrefinfo = self.optimizer.metainterp_sd.virtualref_info
@@ -322,17 +322,17 @@
         # typically a PyPy PyFrame, and now is the end of its execution, so
         # forcing it now does not have catastrophic effects.
         vrefinfo = self.optimizer.metainterp_sd.virtualref_info
-        # op.args[1] should really never point to null here
+        # op.getarg(1) should really never point to null here
         # - set 'forced' to point to the real object
-        op1 = ResOperation(rop.SETFIELD_GC, op.args, None,
+        op1 = ResOperation(rop.SETFIELD_GC, op.getarglist(), None,
                           descr = vrefinfo.descr_forced)
         self.optimize_SETFIELD_GC(op1)
         # - set 'virtual_token' to TOKEN_NONE
-        args = [op.args[0], ConstInt(vrefinfo.TOKEN_NONE)]
+        args = [op.getarg(0), ConstInt(vrefinfo.TOKEN_NONE)]
         op1 = ResOperation(rop.SETFIELD_GC, args, None,
                       descr = vrefinfo.descr_virtual_token)
         self.optimize_SETFIELD_GC(op1)
-        # Note that in some cases the virtual in op.args[1] has been forced
+        # Note that in some cases the virtual in op.getarg(1) has been forced
         # already.  This is fine.  In that case, and *if* a residual
         # CALL_MAY_FORCE suddenly turns out to access it, then it will
         # trigger a ResumeGuardForcedDescr.handle_async_forcing() which
@@ -340,11 +340,11 @@
         # was already forced).
 
     def optimize_GETFIELD_GC(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         if value.is_virtual():
             # optimizefindnode should ensure that fieldvalue is found
             assert isinstance(value, AbstractVirtualValue)
-            fieldvalue = value.getfield(op.descr, None)
+            fieldvalue = value.getfield(op.getdescr(), None)
             assert fieldvalue is not None
             self.make_equal_to(op.result, fieldvalue)
         else:
@@ -357,36 +357,36 @@
     optimize_GETFIELD_GC_PURE = optimize_GETFIELD_GC
 
     def optimize_SETFIELD_GC(self, op):
-        value = self.getvalue(op.args[0])
-        fieldvalue = self.getvalue(op.args[1])
+        value = self.getvalue(op.getarg(0))
+        fieldvalue = self.getvalue(op.getarg(1))
         if value.is_virtual():
-            value.setfield(op.descr, fieldvalue)
+            value.setfield(op.getdescr(), fieldvalue)
         else:
             value.ensure_nonnull()
             ###self.heap_op_optimizer.optimize_SETFIELD_GC(op, value, fieldvalue)
             self.emit_operation(op)
 
     def optimize_NEW_WITH_VTABLE(self, op):
-        self.make_virtual(op.args[0], op.result, op)
+        self.make_virtual(op.getarg(0), op.result, op)
 
     def optimize_NEW(self, op):
-        self.make_vstruct(op.descr, op.result, op)
+        self.make_vstruct(op.getdescr(), op.result, op)
 
     def optimize_NEW_ARRAY(self, op):
-        sizebox = self.get_constant_box(op.args[0])
+        sizebox = self.get_constant_box(op.getarg(0))
         if sizebox is not None:
             # if the original 'op' did not have a ConstInt as argument,
             # build a new one with the ConstInt argument
-            if not isinstance(op.args[0], ConstInt):
+            if not isinstance(op.getarg(0), ConstInt):
                 op = ResOperation(rop.NEW_ARRAY, [sizebox], op.result,
-                                  descr=op.descr)
-            self.make_varray(op.descr, sizebox.getint(), op.result, op)
+                                  descr=op.getdescr())
+            self.make_varray(op.getdescr(), sizebox.getint(), op.result, op)
         else:
             ###self.optimize_default(op)
             self.emit_operation(op)
 
     def optimize_ARRAYLEN_GC(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         if value.is_virtual():
             self.make_constant_int(op.result, value.getlength())
         else:
@@ -395,9 +395,9 @@
             self.emit_operation(op)
 
     def optimize_GETARRAYITEM_GC(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         if value.is_virtual():
-            indexbox = self.get_constant_box(op.args[1])
+            indexbox = self.get_constant_box(op.getarg(1))
             if indexbox is not None:
                 itemvalue = value.getitem(indexbox.getint())
                 self.make_equal_to(op.result, itemvalue)
@@ -411,22 +411,22 @@
     optimize_GETARRAYITEM_GC_PURE = optimize_GETARRAYITEM_GC
 
     def optimize_SETARRAYITEM_GC(self, op):
-        value = self.getvalue(op.args[0])
+        value = self.getvalue(op.getarg(0))
         if value.is_virtual():
-            indexbox = self.get_constant_box(op.args[1])
+            indexbox = self.get_constant_box(op.getarg(1))
             if indexbox is not None:
-                value.setitem(indexbox.getint(), self.getvalue(op.args[2]))
+                value.setitem(indexbox.getint(), self.getvalue(op.getarg(2)))
                 return
         value.ensure_nonnull()
         ###self.heap_op_optimizer.optimize_SETARRAYITEM_GC(op, value, fieldvalue)
         self.emit_operation(op)
 
     def optimize_ARRAYCOPY(self, op):
-        source_value = self.getvalue(op.args[2])
-        dest_value = self.getvalue(op.args[3])
-        source_start_box = self.get_constant_box(op.args[4])
-        dest_start_box = self.get_constant_box(op.args[5])
-        length = self.get_constant_box(op.args[6])
+        source_value = self.getvalue(op.getarg(2))
+        dest_value = self.getvalue(op.getarg(3))
+        source_start_box = self.get_constant_box(op.getarg(4))
+        dest_start_box = self.get_constant_box(op.getarg(5))
+        length = self.get_constant_box(op.getarg(6))
         if (source_value.is_virtual() and source_start_box and dest_start_box
             and length and dest_value.is_virtual()):
             # XXX optimize the case where dest value is not virtual,
@@ -439,13 +439,14 @@
             return
         if length and length.getint() == 0:
             return # 0-length arraycopy
-        descr = op.args[0]
+        descr = op.getarg(0)
         assert isinstance(descr, AbstractDescr)
-        self.emit_operation(ResOperation(rop.CALL, op.args[1:], op.result,
+        args = op.getarglist()[1:]
+        self.emit_operation(ResOperation(rop.CALL, args, op.result,
                                          descr))
 
     def propagate_forward(self, op):
-        opnum = op.opnum
+        opnum = op.getopnum()
         for value, func in optimize_ops:
             if opnum == value:
                 func(self, op)

Modified: pypy/trunk/pypy/jit/metainterp/pyjitpl.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/pyjitpl.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/pyjitpl.py	Wed Sep 22 14:17:16 2010
@@ -159,7 +159,7 @@
         if got_type == history.INT:
             self.registers_i[target_index] = resultbox
         elif got_type == history.REF:
-            #debug_print(' ->', 
+            #debug_print(' ->',
             #            llmemory.cast_ptr_to_adr(resultbox.getref_base()))
             self.registers_r[target_index] = resultbox
         elif got_type == history.FLOAT:
@@ -446,7 +446,7 @@
     def opimpl_newlist(self, structdescr, lengthdescr, itemsdescr, arraydescr,
                        sizebox):
         sbox = self.metainterp.execute_and_record(rop.NEW, structdescr)
-        self.metainterp.execute_and_record(rop.SETFIELD_GC, lengthdescr, 
+        self.metainterp.execute_and_record(rop.SETFIELD_GC, lengthdescr,
                                            sbox, sizebox)
         abox = self.metainterp.execute_and_record(rop.NEW_ARRAY, arraydescr,
                                                   sizebox)
@@ -1004,7 +1004,7 @@
             resumedescr = compile.ResumeGuardDescr(metainterp_sd,
                                                    original_greenkey)
         guard_op = metainterp.history.record(opnum, moreargs, None,
-                                             descr=resumedescr)       
+                                             descr=resumedescr)
         virtualizable_boxes = None
         if metainterp.jitdriver_sd.virtualizable_info is not None:
             virtualizable_boxes = metainterp.virtualizable_boxes
@@ -1463,7 +1463,7 @@
             resbox = self._record_helper_nonpure_varargs(opnum, resbox, descr, argboxes)
         return resbox
 
-    def _record_helper_pure(self, opnum, resbox, descr, *argboxes): 
+    def _record_helper_pure(self, opnum, resbox, descr, *argboxes):
         canfold = self._all_constants(*argboxes)
         if canfold:
             resbox = resbox.constbox()       # ensure it is a Const
@@ -1472,7 +1472,7 @@
             resbox = resbox.nonconstbox()    # ensure it is a Box
             return self._record_helper_nonpure_varargs(opnum, resbox, descr, list(argboxes))
 
-    def _record_helper_pure_varargs(self, opnum, resbox, descr, argboxes): 
+    def _record_helper_pure_varargs(self, opnum, resbox, descr, argboxes):
         canfold = self._all_constants_varargs(argboxes)
         if canfold:
             resbox = resbox.constbox()       # ensure it is a Const
@@ -1485,7 +1485,7 @@
         assert resbox is None or isinstance(resbox, Box)
         # record the operation
         profiler = self.staticdata.profiler
-        profiler.count_ops(opnum, RECORDED_OPS)        
+        profiler.count_ops(opnum, RECORDED_OPS)
         op = self.history.record(opnum, argboxes, resbox, descr)
         self.attach_debug_info(op)
         return resbox
@@ -1667,7 +1667,7 @@
 
         # Search in current_merge_points for original_boxes with compatible
         # green keys, representing the beginning of the same loop as the one
-        # we end now. 
+        # we end now.
 
         num_green_args = self.jitdriver_sd.num_green_args
         for j in range(len(self.current_merge_points)-1, -1, -1):
@@ -1922,7 +1922,7 @@
         vrefbox = self.virtualref_boxes[i+1]
         # record VIRTUAL_REF_FINISH just before the current CALL_MAY_FORCE
         call_may_force_op = self.history.operations.pop()
-        assert call_may_force_op.opnum == rop.CALL_MAY_FORCE
+        assert call_may_force_op.getopnum() == rop.CALL_MAY_FORCE
         self.history.record(rop.VIRTUAL_REF_FINISH,
                             [vrefbox, virtualbox], None)
         self.history.operations.append(call_may_force_op)
@@ -2088,10 +2088,10 @@
         """ Patch a CALL into a CALL_PURE.
         """
         op = self.history.operations[-1]
-        assert op.opnum == rop.CALL
+        assert op.getopnum() == rop.CALL
         resbox_as_const = resbox.constbox()
-        for arg in op.args:
-            if not isinstance(arg, Const):
+        for i in range(op.numargs()):
+            if not isinstance(op.getarg(i), Const):
                 break
         else:
             # all-constants: remove the CALL operation now and propagate a
@@ -2100,8 +2100,8 @@
             return resbox_as_const
         # not all constants (so far): turn CALL into CALL_PURE, which might
         # be either removed later by optimizeopt or turned back into CALL.
-        op.opnum = rop.CALL_PURE
-        op.args = [resbox_as_const] + op.args
+        newop = op.copy_and_change(rop.CALL_PURE, args=[resbox_as_const]+op.getarglist())
+        self.history.operations[-1] = newop
         return resbox
 
     def direct_assembler_call(self, targetjitdriver_sd):
@@ -2109,10 +2109,11 @@
         patching the CALL_MAY_FORCE that occurred just now.
         """
         op = self.history.operations.pop()
-        assert op.opnum == rop.CALL_MAY_FORCE
+        assert op.getopnum() == rop.CALL_MAY_FORCE
         num_green_args = targetjitdriver_sd.num_green_args
-        greenargs = op.args[1:num_green_args+1]
-        args = op.args[num_green_args+1:]
+        arglist = op.getarglist()
+        greenargs = arglist[1:num_green_args+1]
+        args = arglist[num_green_args+1:]
         assert len(args) == targetjitdriver_sd.num_red_args
         vinfo = targetjitdriver_sd.virtualizable_info
         if vinfo is not None:
@@ -2122,9 +2123,7 @@
             # ^^^ and not "+=", which makes 'args' a resizable list
         warmrunnerstate = targetjitdriver_sd.warmstate
         token = warmrunnerstate.get_assembler_token(greenargs, args)
-        op.opnum = rop.CALL_ASSEMBLER
-        op.args = args
-        op.descr = token
+        op = op.copy_and_change(rop.CALL_ASSEMBLER, args=args, descr=token)
         self.history.operations.append(op)
 
 # ____________________________________________________________

Modified: pypy/trunk/pypy/jit/metainterp/resoperation.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/resoperation.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/resoperation.py	Wed Sep 22 14:17:16 2010
@@ -1,42 +1,90 @@
 from pypy.rlib.objectmodel import we_are_translated
 from pypy.rlib.debug import make_sure_not_resized
 
-class ResOperation(object):
-    """The central ResOperation class, representing one operation."""
+def ResOperation(opnum, args, result, descr=None):
+    cls = opclasses[opnum]
+    op = cls(result)
+    op.initarglist(args)
+    if descr is not None:
+        assert isinstance(op, ResOpWithDescr)
+        op.setdescr(descr)
+    return op
+
 
-    # for 'guard_*'
-    fail_args = None
+class AbstractResOp(object):
+    """The central ResOperation class, representing one operation."""
 
     # debug
     name = ""
     pc = 0
 
-    def __init__(self, opnum, args, result, descr=None):
-        make_sure_not_resized(args)
-        assert isinstance(opnum, int)
-        self.opnum = opnum
-        self.args = list(args)
-        make_sure_not_resized(self.args)
-        assert not isinstance(result, list)
+    def __init__(self, result):
         self.result = result
-        self.setdescr(descr)
+
+    # methods implemented by each concrete class
+    # ------------------------------------------
+    
+    def getopnum(self):
+        raise NotImplementedError
+
+    # methods implemented by the arity mixins
+    # ---------------------------------------
+
+    def initarglist(self, args):
+        "This is supposed to be called only just after the ResOp has been created"
+        raise NotImplementedError
+
+    def getarglist(self):
+        raise NotImplementedError
+
+    def getarg(self, i):
+        raise NotImplementedError
+
+    def setarg(self, i, box):
+        raise NotImplementedError
+
+    def numargs(self):
+        raise NotImplementedError
+
+
+    # methods implemented by GuardResOp
+    # ---------------------------------
+
+    def getfailargs(self):
+        return None
+
+    def setfailargs(self, fail_args):
+        raise NotImplementedError
+
+    # methods implemented by ResOpWithDescr
+    # -------------------------------------
+
+    def getdescr(self):
+        return None
 
     def setdescr(self, descr):
-        # for 'call', 'new', 'getfield_gc'...: the descr is a prebuilt
-        # instance provided by the backend holding details about the type
-        # of the operation.  It must inherit from AbstractDescr.  The
-        # backend provides it with cpu.fielddescrof(), cpu.arraydescrof(),
-        # cpu.calldescrof(), and cpu.typedescrof().
-        from pypy.jit.metainterp.history import check_descr
-        check_descr(descr)
-        self.descr = descr
+        raise NotImplementedError
+
+    # common methods
+    # --------------
+
+    def copy_and_change(self, opnum, args=None, result=None, descr=None):
+        "shallow copy: the returned operation is meant to be used in place of self"
+        if args is None:
+            args = self.getarglist()
+        if result is None:
+            result = self.result
+        if descr is None:
+            descr = self.getdescr()
+        newop = ResOperation(opnum, args, result, descr)
+        return newop
 
     def clone(self):
-        descr = self.descr
+        args = self.getarglist()
+        descr = self.getdescr()
         if descr is not None:
             descr = descr.clone_if_mutable()
-        op = ResOperation(self.opnum, self.args, self.result, descr)
-        op.fail_args = self.fail_args
+        op = ResOperation(self.getopnum(), args, self.result, descr)
         if not we_are_translated():
             op.name = self.name
             op.pc = self.pc
@@ -55,82 +103,271 @@
             prefix = "%s:%s   " % (self.name, self.pc)
         else:
             prefix = ""
-        if self.descr is None or we_are_translated():
+        args = self.getarglist()
+        descr = self.getdescr()
+        if descr is None or we_are_translated():
             return '%s%s%s(%s)' % (prefix, sres, self.getopname(),
-                                 ', '.join([str(a) for a in self.args]))
+                                 ', '.join([str(a) for a in args]))
         else:
             return '%s%s%s(%s, descr=%r)' % (prefix, sres, self.getopname(),
-                            ', '.join([str(a) for a in self.args]), self.descr)
+                                             ', '.join([str(a) for a in args]), descr)
 
     def getopname(self):
         try:
-            return opname[self.opnum].lower()
+            return opname[self.getopnum()].lower()
         except KeyError:
-            return '<%d>' % self.opnum
+            return '<%d>' % self.getopnum()
 
     def is_guard(self):
-        return rop._GUARD_FIRST <= self.opnum <= rop._GUARD_LAST
+        return rop._GUARD_FIRST <= self.getopnum() <= rop._GUARD_LAST
 
     def is_foldable_guard(self):
-        return rop._GUARD_FOLDABLE_FIRST <= self.opnum <= rop._GUARD_FOLDABLE_LAST
+        return rop._GUARD_FOLDABLE_FIRST <= self.getopnum() <= rop._GUARD_FOLDABLE_LAST
 
     def is_guard_exception(self):
-        return (self.opnum == rop.GUARD_EXCEPTION or
-                self.opnum == rop.GUARD_NO_EXCEPTION)
+        return (self.getopnum() == rop.GUARD_EXCEPTION or
+                self.getopnum() == rop.GUARD_NO_EXCEPTION)
 
     def is_guard_overflow(self):
-        return (self.opnum == rop.GUARD_OVERFLOW or
-                self.opnum == rop.GUARD_NO_OVERFLOW)
+        return (self.getopnum() == rop.GUARD_OVERFLOW or
+                self.getopnum() == rop.GUARD_NO_OVERFLOW)
 
     def is_always_pure(self):
-        return rop._ALWAYS_PURE_FIRST <= self.opnum <= rop._ALWAYS_PURE_LAST
+        return rop._ALWAYS_PURE_FIRST <= self.getopnum() <= rop._ALWAYS_PURE_LAST
 
     def has_no_side_effect(self):
-        return rop._NOSIDEEFFECT_FIRST <= self.opnum <= rop._NOSIDEEFFECT_LAST
+        return rop._NOSIDEEFFECT_FIRST <= self.getopnum() <= rop._NOSIDEEFFECT_LAST
 
     def can_raise(self):
-        return rop._CANRAISE_FIRST <= self.opnum <= rop._CANRAISE_LAST
+        return rop._CANRAISE_FIRST <= self.getopnum() <= rop._CANRAISE_LAST
 
     def is_ovf(self):
-        return rop._OVF_FIRST <= self.opnum <= rop._OVF_LAST
+        return rop._OVF_FIRST <= self.getopnum() <= rop._OVF_LAST
 
     def is_comparison(self):
         return self.is_always_pure() and self.returns_bool_result()
 
     def is_final(self):
-        return rop._FINAL_FIRST <= self.opnum <= rop._FINAL_LAST
+        return rop._FINAL_FIRST <= self.getopnum() <= rop._FINAL_LAST
 
     def returns_bool_result(self):
-        opnum = self.opnum
+        opnum = self.getopnum()
         if we_are_translated():
             assert opnum >= 0
         elif opnum < 0:
             return False     # for tests
         return opboolresult[opnum]
 
+
+# ===================
+# Top of the hierachy
+# ===================
+
+class PlainResOp(AbstractResOp):
+    pass
+
+class ResOpWithDescr(AbstractResOp):
+
+    _descr = None
+
+    def getdescr(self):
+        return self._descr
+
+    def setdescr(self, descr):
+        # for 'call', 'new', 'getfield_gc'...: the descr is a prebuilt
+        # instance provided by the backend holding details about the type
+        # of the operation.  It must inherit from AbstractDescr.  The
+        # backend provides it with cpu.fielddescrof(), cpu.arraydescrof(),
+        # cpu.calldescrof(), and cpu.typedescrof().
+        from pypy.jit.metainterp.history import check_descr
+        check_descr(descr)
+        self._descr = descr
+
+class GuardResOp(ResOpWithDescr):
+
+    _fail_args = None
+
+    def getfailargs(self):
+        return self._fail_args
+
+    def setfailargs(self, fail_args):
+        self._fail_args = fail_args
+
+    def copy_and_change(self, opnum, args=None, result=None, descr=None):
+        newop = AbstractResOp.copy_and_change(self, opnum, args, result, descr)
+        newop.setfailargs(self.getfailargs())
+        return newop
+
+    def clone(self):
+        newop = AbstractResOp.clone(self)
+        newop.setfailargs(self.getfailargs())
+        return newop
+
+
+# ============
+# arity mixins
+# ============
+
+class NullaryOp(object):
+    _mixin_ = True
+
+    def initarglist(self, args):
+        assert len(args) == 0
+
+    def getarglist(self):
+        return []
+
+    def numargs(self):
+        return 0
+
+    def getarg(self, i):
+        raise IndexError
+    
+    def setarg(self, i, box):
+        raise IndexError
+
+
+class UnaryOp(object):
+    _mixin_ = True
+    _arg0 = None
+
+    def initarglist(self, args):
+        assert len(args) == 1
+        self._arg0, = args
+
+    def getarglist(self):
+        return [self._arg0]
+
+    def numargs(self):
+        return 1
+
+    def getarg(self, i):
+        if i == 0:
+            return self._arg0
+        else:
+            raise IndexError
+    
+    def setarg(self, i, box):
+        if i == 0:
+            self._arg0 = box
+        else:
+            raise IndexError
+
+
+class BinaryOp(object):
+    _mixin_ = True
+    _arg0 = None
+    _arg1 = None
+
+    def initarglist(self, args):
+        assert len(args) == 2
+        self._arg0, self._arg1 = args
+
+    def getarglist(self):
+        return [self._arg0, self._arg1, self._arg2]
+
+    def numargs(self):
+        return 2
+
+    def getarg(self, i):
+        if i == 0:
+            return self._arg0
+        elif i == 1:
+            return self._arg1
+        else:
+            raise IndexError
+    
+    def setarg(self, i, box):
+        if i == 0:
+            self._arg0 = box
+        elif i == 1:
+            self._arg1 = box
+        else:
+            raise IndexError
+
+    def getarglist(self):
+        return [self._arg0, self._arg1]
+
+
+class TernaryOp(object):
+    _mixin_ = True
+    _arg0 = None
+    _arg1 = None
+    _arg2 = None
+
+    def initarglist(self, args):
+        assert len(args) == 3
+        self._arg0, self._arg1, self._arg2 = args
+
+    def getarglist(self):
+        return [self._arg0, self._arg1, self._arg2]
+
+    def numargs(self):
+        return 3
+
+    def getarg(self, i):
+        if i == 0:
+            return self._arg0
+        elif i == 1:
+            return self._arg1
+        elif i == 2:
+            return self._arg2
+        else:
+            raise IndexError
+    
+    def setarg(self, i, box):
+        if i == 0:
+            self._arg0 = box
+        elif i == 1:
+            self._arg1 = box
+        elif i == 2:
+            self._arg2 = box
+        else:
+            raise IndexError
+
+class N_aryOp(object):
+    _mixin_ = True
+    _args = None
+
+    def initarglist(self, args):
+        self._args = args
+
+    def getarglist(self):
+        return self._args
+
+    def numargs(self):
+        return len(self._args)
+
+    def getarg(self, i):
+        return self._args[i]
+    
+    def setarg(self, i, box):
+        self._args[i] = box
+
+
 # ____________________________________________________________
 
 _oplist = [
     '_FINAL_FIRST',
-    'JUMP',
-    'FINISH',
+    'JUMP/*d',
+    'FINISH/*d',
     '_FINAL_LAST',
 
     '_GUARD_FIRST',
     '_GUARD_FOLDABLE_FIRST',
-    'GUARD_TRUE',
-    'GUARD_FALSE',
-    'GUARD_VALUE',
-    'GUARD_CLASS',
-    'GUARD_NONNULL',
-    'GUARD_ISNULL',
-    'GUARD_NONNULL_CLASS',
+    'GUARD_TRUE/1d',
+    'GUARD_FALSE/1d',
+    'GUARD_VALUE/2d',
+    'GUARD_CLASS/2d',
+    'GUARD_NONNULL/1d',
+    'GUARD_ISNULL/1d',
+    'GUARD_NONNULL_CLASS/2d',
     '_GUARD_FOLDABLE_LAST',
-    'GUARD_NO_EXCEPTION',
-    'GUARD_EXCEPTION',
-    'GUARD_NO_OVERFLOW',
-    'GUARD_OVERFLOW',
-    'GUARD_NOT_FORCED',
+    'GUARD_NO_EXCEPTION/0d',
+    'GUARD_EXCEPTION/1d',
+    'GUARD_NO_OVERFLOW/0d',
+    'GUARD_OVERFLOW/0d',
+    'GUARD_NOT_FORCED/0d',
     '_GUARD_LAST', # ----- end of guard operations -----
 
     '_NOSIDEEFFECT_FIRST', # ----- start of no_side_effect operations -----
@@ -218,19 +455,19 @@
     'STRSETITEM/3',
     'UNICODESETITEM/3',
     'NEWUNICODE/1',
-    #'RUNTIMENEW/1',     # ootype operation
-    'COND_CALL_GC_WB',  # [objptr, newvalue]   (for the write barrier)
+    #'RUNTIMENEW/1',     # ootype operation    
+    'COND_CALL_GC_WB/2d', # [objptr, newvalue]   (for the write barrier)
     'DEBUG_MERGE_POINT/1',      # debugging only
     'VIRTUAL_REF_FINISH/2',   # removed before it's passed to the backend
 
     '_CANRAISE_FIRST', # ----- start of can_raise operations -----
-    'CALL',
-    'CALL_ASSEMBLER',
-    'CALL_MAY_FORCE',
-    'CALL_LOOPINVARIANT',
+    'CALL/*d',
+    'CALL_ASSEMBLER/*d',
+    'CALL_MAY_FORCE/*d',
+    'CALL_LOOPINVARIANT/*d',
     #'OOSEND',                     # ootype operation
     #'OOSEND_PURE',                # ootype operation
-    'CALL_PURE',             # removed before it's passed to the backend
+    'CALL_PURE/*d',             # removed before it's passed to the backend
                              # CALL_PURE(result, func, arg_1,..,arg_n)
     '_CANRAISE_LAST', # ----- end of can_raise operations -----
 
@@ -247,6 +484,7 @@
 class rop(object):
     pass
 
+opclasses = []   # mapping numbers to the concrete ResOp class
 opname = {}      # mapping numbers to the original names, for debugging
 oparity = []     # mapping numbers to the arity of the operation or -1
 opwithdescr = [] # mapping numbers to a flag "takes a descr"
@@ -261,16 +499,62 @@
             name, arity = name.split('/')
             withdescr = 'd' in arity
             boolresult = 'b' in arity
-            arity = int(arity.rstrip('db'))
+            arity = arity.rstrip('db')
+            if arity == '*':
+                arity = -1
+            else:
+                arity = int(arity)
         else:
             arity, withdescr, boolresult = -1, True, False       # default
         setattr(rop, name, i)
         if not name.startswith('_'):
             opname[i] = name
+            cls = create_class_for_op(name, i, arity, withdescr)
+        else:
+            cls = None
+        opclasses.append(cls)
         oparity.append(arity)
         opwithdescr.append(withdescr)
         opboolresult.append(boolresult)
-    assert len(oparity)==len(opwithdescr)==len(opboolresult)==len(_oplist)
+    assert len(opclasses)==len(oparity)==len(opwithdescr)==len(opboolresult)==len(_oplist)
+
+def get_base_class(mixin, base):
+    try:
+        return get_base_class.cache[(mixin, base)]
+    except KeyError:
+        arity_name = mixin.__name__[:-2]  # remove the trailing "Op"
+        name = arity_name + base.__name__ # something like BinaryPlainResOp
+        bases = (mixin, base)
+        cls = type(name, bases, {})
+        get_base_class.cache[(mixin, base)] = cls
+        return cls
+get_base_class.cache = {}
+
+def create_class_for_op(name, opnum, arity, withdescr):
+    arity2mixin = {
+        0: NullaryOp,
+        1: UnaryOp,
+        2: BinaryOp,
+        3: TernaryOp
+        }
+    
+    is_guard = name.startswith('GUARD')
+    if is_guard:
+        assert withdescr
+        baseclass = GuardResOp
+    elif withdescr:
+        baseclass = ResOpWithDescr
+    else:
+        baseclass = PlainResOp
+    mixin = arity2mixin.get(arity, N_aryOp)
+
+    def getopnum(self):
+        return opnum
+
+    cls_name = '%s_OP' % name
+    bases = (get_base_class(mixin, baseclass),)
+    dic = {'getopnum': getopnum}
+    return type(cls_name, bases, dic)
 
 setup(__name__ == '__main__')   # print out the table when run directly
 del _oplist

Modified: pypy/trunk/pypy/jit/metainterp/simple_optimize.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/simple_optimize.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/simple_optimize.py	Wed Sep 22 14:17:16 2010
@@ -11,15 +11,17 @@
     from pypy.jit.metainterp.history import AbstractDescr
     # change ARRAYCOPY to call, so we don't have to pass around
     # unnecessary information to the backend.  Do the same with VIRTUAL_REF_*.
-    if op.opnum == rop.ARRAYCOPY:
-        descr = op.args[0]
+    if op.getopnum() == rop.ARRAYCOPY:
+        descr = op.getarg(0)
         assert isinstance(descr, AbstractDescr)
-        op = ResOperation(rop.CALL, op.args[1:], op.result, descr=descr)
-    elif op.opnum == rop.CALL_PURE:
-        op = ResOperation(rop.CALL, op.args[1:], op.result, op.descr)
-    elif op.opnum == rop.VIRTUAL_REF:
-        op = ResOperation(rop.SAME_AS, [op.args[0]], op.result)
-    elif op.opnum == rop.VIRTUAL_REF_FINISH:
+        args = op.getarglist()[1:]
+        op = ResOperation(rop.CALL, args, op.result, descr=descr)
+    elif op.getopnum() == rop.CALL_PURE:
+        args = op.getarglist()[1:]
+        op = ResOperation(rop.CALL, args, op.result, op.getdescr())
+    elif op.getopnum() == rop.VIRTUAL_REF:
+        op = ResOperation(rop.SAME_AS, [op.getarg(0)], op.result)
+    elif op.getopnum() == rop.VIRTUAL_REF_FINISH:
         return []
     return [op]
 
@@ -36,7 +38,7 @@
         newoperations = []
         for op in loop.operations:
             if op.is_guard():
-                descr = op.descr
+                descr = op.getdescr()
                 assert isinstance(descr, compile.ResumeGuardDescr)
                 modifier = resume.ResumeDataVirtualAdder(descr, memo)
                 newboxes = modifier.finish(EMPTY_VALUES)

Modified: pypy/trunk/pypy/jit/metainterp/test/oparser.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/test/oparser.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/test/oparser.py	Wed Sep 22 14:17:16 2010
@@ -6,7 +6,7 @@
 from pypy.jit.metainterp.history import TreeLoop, BoxInt, ConstInt,\
      ConstObj, ConstPtr, Box, BasicFailDescr, BoxFloat, ConstFloat,\
      LoopToken
-from pypy.jit.metainterp.resoperation import rop, ResOperation
+from pypy.jit.metainterp.resoperation import rop, ResOperation, ResOpWithDescr, N_aryOp
 from pypy.jit.metainterp.typesystem import llhelper
 from pypy.jit.codewriter.heaptracker import adr2int
 from pypy.rpython.lltypesystem import lltype, llmemory
@@ -16,17 +16,29 @@
 class ParseError(Exception):
     pass
 
-
 class Boxes(object):
     pass
 
+class ESCAPE_OP(N_aryOp, ResOpWithDescr):
+
+    OPNUM = -123
+
+    def __init__(self, opnum, args, result, descr=None):
+        assert opnum == self.OPNUM
+        self.result = result
+        self.initarglist(args)
+        self.setdescr(descr)
+
+    def getopnum(self):
+        return self.OPNUM
+
 class ExtendedTreeLoop(TreeLoop):
 
     def getboxes(self):
         def opboxes(operations):
             for op in operations:
                 yield op.result
-                for box in op.args:
+                for box in op.getarglist():
                     yield box
         def allboxes():
             for box in self.inputargs:
@@ -171,7 +183,7 @@
             opnum = getattr(rop, opname.upper())
         except AttributeError:
             if opname == 'escape':
-                opnum = -123
+                opnum = ESCAPE_OP.OPNUM
             else:
                 raise ParseError("unknown op: %s" % opname)
         endnum = line.rfind(')')
@@ -228,6 +240,12 @@
                     descr = self.looptoken
         return opnum, args, descr, fail_args
 
+    def create_op(self, opnum, args, result, descr):
+        if opnum == ESCAPE_OP.OPNUM:
+            return ESCAPE_OP(opnum, args, result, descr)
+        else:
+            return ResOperation(opnum, args, result, descr)
+
     def parse_result_op(self, line):
         res, op = line.split("=", 1)
         res = res.strip()
@@ -237,14 +255,16 @@
             raise ParseError("Double assign to var %s in line: %s" % (res, line))
         rvar = self.box_for_var(res)
         self.vars[res] = rvar
-        res = ResOperation(opnum, args, rvar, descr)
-        res.fail_args = fail_args
+        res = self.create_op(opnum, args, rvar, descr)
+        if fail_args is not None:
+            res.setfailargs(fail_args)
         return res
 
     def parse_op_no_result(self, line):
         opnum, args, descr, fail_args = self.parse_op(line)
-        res = ResOperation(opnum, args, None, descr)
-        res.fail_args = fail_args
+        res = self.create_op(opnum, args, None, descr)
+        if fail_args is not None:
+            res.setfailargs(fail_args)
         return res
 
     def parse_next_op(self, line):

Modified: pypy/trunk/pypy/jit/metainterp/test/test_basic.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/test/test_basic.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/test/test_basic.py	Wed Sep 22 14:17:16 2010
@@ -296,7 +296,7 @@
             found = 0
             for op in get_stats().loops[0]._all_operations():
                 if op.getopname() == 'guard_true':
-                    liveboxes = op.fail_args
+                    liveboxes = op.getfailargs()
                     assert len(liveboxes) == 3
                     for box in liveboxes:
                         assert isinstance(box, history.BoxInt)

Modified: pypy/trunk/pypy/jit/metainterp/test/test_logger.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/test/test_logger.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/test/test_logger.py	Wed Sep 22 14:17:16 2010
@@ -100,8 +100,8 @@
         debug_merge_point("info")
         '''
         loop, oloop = self.reparse(inp, check_equal=False)
-        assert loop.operations[0].args[0]._get_str() == 'info'
-        assert oloop.operations[0].args[0]._get_str() == 'info'
+        assert loop.operations[0].getarg(0)._get_str() == 'info'
+        assert oloop.operations[0].getarg(0)._get_str() == 'info'
         
     def test_floats(self):
         inp = '''

Modified: pypy/trunk/pypy/jit/metainterp/test/test_loop.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/test/test_loop.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/test/test_loop.py	Wed Sep 22 14:17:16 2010
@@ -178,7 +178,7 @@
             found = 0
             for op in get_stats().loops[0]._all_operations():
                 if op.getopname() == 'guard_true':
-                    liveboxes = op.fail_args
+                    liveboxes = op.getfailargs()
                     assert len(liveboxes) == 2     # x, y (in some order)
                     assert isinstance(liveboxes[0], history.BoxInt)
                     assert isinstance(liveboxes[1], history.BoxInt)

Modified: pypy/trunk/pypy/jit/metainterp/test/test_oparser.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/test/test_oparser.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/test/test_oparser.py	Wed Sep 22 14:17:16 2010
@@ -16,10 +16,10 @@
     """
     loop = parse(x)
     assert len(loop.operations) == 3
-    assert [op.opnum for op in loop.operations] == [rop.INT_ADD, rop.INT_SUB,
+    assert [op.getopnum() for op in loop.operations] == [rop.INT_ADD, rop.INT_SUB,
                                                     rop.FINISH]
     assert len(loop.inputargs) == 2
-    assert loop.operations[-1].descr
+    assert loop.operations[-1].getdescr()
 
 def test_const_ptr_subops():
     x = """
@@ -30,8 +30,8 @@
     vtable = lltype.nullptr(S)
     loop = parse(x, None, locals())
     assert len(loop.operations) == 1
-    assert loop.operations[0].descr
-    assert loop.operations[0].fail_args == []
+    assert loop.operations[0].getdescr()
+    assert loop.operations[0].getfailargs() == []
 
 def test_descr():
     class Xyz(AbstractDescr):
@@ -43,7 +43,7 @@
     """
     stuff = Xyz()
     loop = parse(x, None, locals())
-    assert loop.operations[0].descr is stuff
+    assert loop.operations[0].getdescr() is stuff
 
 def test_after_fail():
     x = """
@@ -64,7 +64,7 @@
     """
     stuff = Xyz()
     loop = parse(x, None, locals())
-    assert loop.operations[0].descr is stuff
+    assert loop.operations[0].getdescr() is stuff
 
 def test_boxname():
     x = """
@@ -111,7 +111,7 @@
     TP = lltype.GcArray(lltype.Signed)
     NULL = lltype.cast_opaque_ptr(llmemory.GCREF, lltype.nullptr(TP))
     loop = parse(x, None, {'func_ptr' : NULL})
-    assert loop.operations[0].args[0].value == NULL
+    assert loop.operations[0].getarg(0).value == NULL
 
 def test_jump_target():
     x = '''
@@ -119,7 +119,7 @@
     jump()
     '''
     loop = parse(x)
-    assert loop.operations[0].descr is loop.token
+    assert loop.operations[0].getdescr() is loop.token
 
 def test_jump_target_other():
     looptoken = LoopToken()
@@ -128,7 +128,7 @@
     jump(descr=looptoken)
     '''
     loop = parse(x, namespace=locals())
-    assert loop.operations[0].descr is looptoken
+    assert loop.operations[0].getdescr() is looptoken
 
 def test_floats():
     x = '''
@@ -136,7 +136,7 @@
     f1 = float_add(f0, 3.5)
     '''
     loop = parse(x)
-    assert isinstance(loop.operations[0].args[0], BoxFloat)
+    assert isinstance(loop.operations[0].getarg(0), BoxFloat)
     
 def test_debug_merge_point():
     x = '''
@@ -147,10 +147,10 @@
     debug_merge_point('(stuff) #1')
     '''
     loop = parse(x)
-    assert loop.operations[0].args[0]._get_str() == 'info'
-    assert loop.operations[1].args[0]._get_str() == 'info'
-    assert loop.operations[2].args[0]._get_str() == "<some ('other,')> info"
-    assert loop.operations[3].args[0]._get_str() == "(stuff) #1"
+    assert loop.operations[0].getarg(0)._get_str() == 'info'
+    assert loop.operations[1].getarg(0)._get_str() == 'info'
+    assert loop.operations[2].getarg(0)._get_str() == "<some ('other,')> info"
+    assert loop.operations[3].getarg(0)._get_str() == "(stuff) #1"
     
 
 def test_descr_with_obj_print():

Modified: pypy/trunk/pypy/jit/metainterp/test/test_optimizeopt.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/test/test_optimizeopt.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/test/test_optimizeopt.py	Wed Sep 22 14:17:16 2010
@@ -42,7 +42,7 @@
     opt = optimizeopt.Optimizer(FakeMetaInterpStaticData(LLtypeMixin.cpu),
                                 None)
     fdescr = ResumeGuardDescr(None, None)
-    op = ResOperation(rop.GUARD_TRUE, [], None, descr=fdescr)
+    op = ResOperation(rop.GUARD_TRUE, ['dummy'], None, descr=fdescr)
     # setup rd data
     fi0 = resume.FrameInfo(None, "code0", 11)
     fdescr.rd_frame_info_list = resume.FrameInfo(fi0, "code1", 33)
@@ -50,11 +50,11 @@
     fdescr.rd_snapshot = resume.Snapshot(snapshot0, [b1])
     #
     opt.store_final_boxes_in_guard(op)
-    if op.fail_args == [b0, b1]:
+    if op.getfailargs() == [b0, b1]:
         assert fdescr.rd_numb.nums      == [tag(1, TAGBOX)]
         assert fdescr.rd_numb.prev.nums == [tag(0, TAGBOX)]
     else:
-        assert op.fail_args == [b1, b0]
+        assert op.getfailargs() == [b1, b0]
         assert fdescr.rd_numb.nums      == [tag(0, TAGBOX)]
         assert fdescr.rd_numb.prev.nums == [tag(1, TAGBOX)]
     assert fdescr.rd_virtuals is None
@@ -140,24 +140,26 @@
             print '%-39s| %s' % (txt1[:39], txt2[:39])
             txt1 = txt1[39:]
             txt2 = txt2[39:]
-        assert op1.opnum == op2.opnum
-        assert len(op1.args) == len(op2.args)
-        for x, y in zip(op1.args, op2.args):
+        assert op1.getopnum() == op2.getopnum()
+        assert op1.numargs() == op2.numargs()
+        for i in range(op1.numargs()):
+            x = op1.getarg(i)
+            y = op2.getarg(i)
             assert x == remap.get(y, y)
         if op2.result in remap:
             assert op1.result == remap[op2.result]
         else:
             remap[op2.result] = op1.result
-        if op1.opnum != rop.JUMP:      # xxx obscure
-            assert op1.descr == op2.descr
-        if op1.fail_args or op2.fail_args:
-            assert len(op1.fail_args) == len(op2.fail_args)
+        if op1.getopnum() != rop.JUMP:      # xxx obscure
+            assert op1.getdescr() == op2.getdescr()
+        if op1.getfailargs() or op2.getfailargs():
+            assert len(op1.getfailargs()) == len(op2.getfailargs())
             if strict_fail_args:
-                for x, y in zip(op1.fail_args, op2.fail_args):
+                for x, y in zip(op1.getfailargs(), op2.getfailargs()):
                     assert x == remap.get(y, y)
             else:
-                fail_args1 = set(op1.fail_args)
-                fail_args2 = set([remap.get(y, y) for y in op2.fail_args])
+                fail_args1 = set(op1.getfailargs())
+                fail_args2 = set([remap.get(y, y) for y in op2.getfailargs()])
                 assert fail_args1 == fail_args2
     assert len(oplist1) == len(oplist2)
     print '-'*57
@@ -209,7 +211,7 @@
         self.metainterp_sd = metainterp_sd
         self.original_greenkey = original_greenkey
     def store_final_boxes(self, op, boxes):
-        op.fail_args = boxes
+        op.setfailargs(boxes)
     def __eq__(self, other):
         return type(self) is type(other)      # xxx obscure
 
@@ -2361,8 +2363,8 @@
         from pypy.jit.metainterp.test.test_resume import ResumeDataFakeReader
         from pypy.jit.metainterp.test.test_resume import MyMetaInterp
         guard_op, = [op for op in self.loop.operations if op.is_guard()]
-        fail_args = guard_op.fail_args
-        fdescr = guard_op.descr
+        fail_args = guard_op.getfailargs()
+        fdescr = guard_op.getdescr()
         assert fdescr.guard_opnum == guard_opnum
         reader = ResumeDataFakeReader(fdescr, fail_args,
                                       MyMetaInterp(self.cpu))

Modified: pypy/trunk/pypy/jit/metainterp/test/test_recursive.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/test/test_recursive.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/test/test_recursive.py	Wed Sep 22 14:17:16 2010
@@ -319,8 +319,8 @@
         for loop in get_stats().loops:
             assert len(loop.operations) <= length + 5 # because we only check once per metainterp bytecode
             for op in loop.operations:
-                if op.is_guard() and hasattr(op.descr, '_debug_suboperations'):
-                    assert len(op.descr._debug_suboperations) <= length + 5
+                if op.is_guard() and hasattr(op.getdescr(), '_debug_suboperations'):
+                    assert len(op.getdescr()._debug_suboperations) <= length + 5
 
     def test_inline_trace_limit(self):
         myjitdriver = JitDriver(greens=[], reds=['n'])

Modified: pypy/trunk/pypy/jit/metainterp/test/test_virtualref.py
==============================================================================
--- pypy/trunk/pypy/jit/metainterp/test/test_virtualref.py	(original)
+++ pypy/trunk/pypy/jit/metainterp/test/test_virtualref.py	Wed Sep 22 14:17:16 2010
@@ -71,11 +71,11 @@
         #
         ops = self.metainterp.staticdata.stats.loops[0].operations
         [guard_op] = [op for op in ops
-                         if op.opnum == rop.GUARD_NOT_FORCED]
-        bxs1 = [box for box in guard_op.fail_args
+                         if op.getopnum() == rop.GUARD_NOT_FORCED]
+        bxs1 = [box for box in guard_op.getfailargs()
                   if str(box._getrepr_()).endswith('.X')]
         assert len(bxs1) == 1
-        bxs2 = [box for box in guard_op.fail_args
+        bxs2 = [box for box in guard_op.getfailargs()
                   if str(box._getrepr_()).endswith('JitVirtualRef')]
         assert len(bxs2) == 1
         JIT_VIRTUAL_REF = self.vrefinfo.JIT_VIRTUAL_REF
@@ -84,11 +84,11 @@
         # try reloading from blackhole.py's point of view
         from pypy.jit.metainterp.resume import ResumeDataDirectReader
         cpu = self.metainterp.cpu
-        cpu.get_latest_value_count = lambda : len(guard_op.fail_args)
-        cpu.get_latest_value_int = lambda i:guard_op.fail_args[i].getint()
-        cpu.get_latest_value_ref = lambda i:guard_op.fail_args[i].getref_base()
+        cpu.get_latest_value_count = lambda : len(guard_op.getfailargs())
+        cpu.get_latest_value_int = lambda i:guard_op.getfailargs()[i].getint()
+        cpu.get_latest_value_ref = lambda i:guard_op.getfailargs()[i].getref_base()
         cpu.clear_latest_values = lambda count: None
-        resumereader = ResumeDataDirectReader(cpu, guard_op.descr)
+        resumereader = ResumeDataDirectReader(cpu, guard_op.getdescr())
         vrefinfo = self.metainterp.staticdata.virtualref_info
         lst = []
         vrefinfo.continue_tracing = lambda vref, virtual: \
@@ -100,7 +100,7 @@
                                lst[0][0])  # assert correct type
         #
         # try reloading from pyjitpl's point of view
-        self.metainterp.rebuild_state_after_failure(guard_op.descr)
+        self.metainterp.rebuild_state_after_failure(guard_op.getdescr())
         assert len(self.metainterp.framestack) == 1
         assert len(self.metainterp.virtualref_boxes) == 2
         assert self.metainterp.virtualref_boxes[0].value == bxs1[0].value

Modified: pypy/trunk/pypy/jit/tool/showstats.py
==============================================================================
--- pypy/trunk/pypy/jit/tool/showstats.py	(original)
+++ pypy/trunk/pypy/jit/tool/showstats.py	Wed Sep 22 14:17:16 2010
@@ -17,7 +17,7 @@
         num_dmp = 0
         num_guards = 0
         for op in loop.operations:
-            if op.opnum == rop.DEBUG_MERGE_POINT:
+            if op.getopnum() == rop.DEBUG_MERGE_POINT:
                 num_dmp += 1
             else:
                 num_ops += 1



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