rewrite instance_setattro

src/runtime/classobj.cpp

@@ -46,6 +46,14 @@ static Box* classLookup(BoxedClassobj* cls, BoxedString* attr, GetattrRewriteArg
         return r;
     }
 
+    if (cls->bases == EmptyTuple) {
+        if (rewrite_args && rewrite_args->isSuccessful()) {
+            rewrite_args->obj->addAttrGuard(offsetof(BoxedClassobj, bases), (uint64_t)EmptyTuple);
+            rewrite_args->assertReturnConvention(ReturnConvention::NO_RETURN);
+        }
+        return NULL;
+    }
+
     if (rewrite_args) {
         if (rewrite_args->isSuccessful()) {
             rewrite_args->getReturn(); // just to make the asserts happy
@@ -489,7 +497,9 @@ Box* instanceGetattroInternal(Box* cls, Box* _attr, GetattrRewriteArgs* rewrite_
 template Box* instanceGetattroInternal<CAPI>(Box*, Box*, GetattrRewriteArgs*) noexcept;
 template Box* instanceGetattroInternal<CXX>(Box*, Box*, GetattrRewriteArgs*);
 
-Box* instanceSetattr(Box* _inst, Box* _attr, Box* value) {
+Box* instanceSetattroInternal(Box* _inst, Box* _attr, Box* value, SetattrRewriteArgs* rewrite_args) {
+    STAT_TIMER(t0, "us_timer_instance_setattro", 0);
+
     RELEASE_ASSERT(_inst->cls == instance_cls, "");
     BoxedInstance* inst = static_cast<BoxedInstance*>(_inst);
 
@@ -513,15 +523,43 @@ Box* instanceSetattr(Box* _inst, Box* _attr, Box* value) {
     }
 
     static BoxedString* setattr_str = internStringImmortal("__setattr__");
-    Box* setattr = classLookup(inst->inst_cls, setattr_str);
 
-    if (setattr) {
-        setattr = processDescriptor(setattr, inst, inst->inst_cls);
-        return runtimeCall(setattr, ArgPassSpec(2), _attr, value, NULL, NULL, NULL);
+    if (rewrite_args) {
+        RewriterVar* inst_r = rewrite_args->obj->getAttr(offsetof(BoxedInstance, inst_cls));
+        inst_r->addGuard((uint64_t)inst->inst_cls);
+        GetattrRewriteArgs grewrite_args(rewrite_args->rewriter, inst_r,
+                                         rewrite_args->rewriter->getReturnDestination());
+        Box* setattr = classLookup<REWRITABLE>(inst->inst_cls, setattr_str, &grewrite_args);
+
+        if (!grewrite_args.isSuccessful()) {
+            assert(!rewrite_args->out_success);
+            rewrite_args = NULL;
+        }
+
+        if (setattr) {
+            setattr = processDescriptor(setattr, inst, inst->inst_cls);
+            return runtimeCall(setattr, ArgPassSpec(2), _attr, value, NULL, NULL, NULL);
+        }
+
+        if (rewrite_args)
+            grewrite_args.assertReturnConvention(ReturnConvention::NO_RETURN);
+
+        _inst->setattr(attr, value, rewrite_args);
+        return None;
+    } else {
+        Box* setattr = classLookup(inst->inst_cls, setattr_str);
+        if (setattr) {
+            setattr = processDescriptor(setattr, inst, inst->inst_cls);
+            return runtimeCall(setattr, ArgPassSpec(2), _attr, value, NULL, NULL, NULL);
+        }
+
+        _inst->setattr(attr, value, NULL);
+        return None;
     }
+}
 
-    _inst->setattr(attr, value, NULL);
-    return None;
+Box* instanceSetattr(Box* _inst, Box* _attr, Box* value) {
+    return instanceSetattroInternal(_inst, _attr, value, NULL);
 }
 
 Box* instanceDelattr(Box* _inst, Box* _attr) {
@@ -552,7 +590,7 @@ Box* instanceDelattr(Box* _inst, Box* _attr) {
     return None;
 }
 
-static int instance_setattro(Box* cls, Box* attr, Box* value) noexcept {
+int instance_setattro(Box* cls, Box* attr, Box* value) noexcept {
     try {
         if (value) {
             instanceSetattr(cls, attr, value);

src/runtime/classobj.h

@@ -85,9 +85,11 @@ public:
 };
 
 Box* instance_getattro(Box* cls, Box* attr) noexcept;
+int instance_setattro(Box* cls, Box* attr, Box* value) noexcept;
 class GetattrRewriteArgs;
 template <ExceptionStyle S>
 Box* instanceGetattroInternal(Box* self, Box* attr, GetattrRewriteArgs* rewrite_args) noexcept(S == CAPI);
+Box* instanceSetattroInternal(Box* self, Box* attr, Box* val, SetattrRewriteArgs* rewrite_args);
 }
 
 #endif

src/runtime/objmodel.cpp

@@ -2429,12 +2429,22 @@ extern "C" void setattr(Box* obj, BoxedString* attr, Box* attr_val) {
         r_cls->addAttrGuard(offsetof(BoxedClass, tp_setattro), (intptr_t)tp_setattro);
     }
 
-
     // Note: setattr will only be retrieved if we think it will be profitable to try calling that as opposed to
     // the tp_setattr function pointer.
     Box* setattr = NULL;
     RewriterVar* r_setattr;
-    if (tp_setattro != PyObject_GenericSetAttr) {
+
+    if (tp_setattro == instance_setattro) {
+        if (rewriter.get()) {
+            SetattrRewriteArgs rewrite_args(rewriter.get(), rewriter->getArg(0), rewriter->getArg(2));
+            instanceSetattroInternal(obj, attr, attr_val, &rewrite_args);
+            if (rewrite_args.out_success)
+                rewriter->commit();
+        } else
+            instanceSetattroInternal(obj, attr, attr_val, NULL);
+
+        return;
+    } else if (tp_setattro != PyObject_GenericSetAttr) {
         static BoxedString* setattr_str = internStringImmortal("__setattr__");
         if (rewriter.get()) {
             GetattrRewriteArgs rewrite_args(rewriter.get(), rewriter->getArg(0)->getAttr(offsetof(Box, cls)),

src/runtime/tuple.cpp

@@ -372,6 +372,8 @@ extern "C" Box* tupleNew(Box* _cls, BoxedTuple* args, BoxedDict* kwargs) {
 
         return BoxedTuple::create(elts.size(), &elts[0], cls);
     } else {
+        if (cls == tuple_cls)
+            return EmptyTuple;
         return BoxedTuple::create(0, cls);
     }
 }

test/tests/oldstyle_classes.py

@@ -492,3 +492,22 @@ try:
 except:
     print sys.exc_info()[0].__name__, sys.exc_info()[1]
 
+
+s1 = 0
+class C():
+    pass
+class D():
+    def __setattr__(self, a, v):
+        global s1
+        s1 += v
+
+o = C()
+s2 = 0
+for i in range(500):
+    o.a = 1
+    s2 += o.a
+    if i == 100:
+        C.__bases__ = (D,)
+    if i == 150:
+        C.__bases__ = tuple()
+print s1, s2

test/tests/setattr_ics.py

@@ -30,3 +30,11 @@ test(Test())
 del Test.__setattr__
 for i in xrange(100):
     test(Test())
+
+class Old():
+    pass
+old = Old()
+for i in xrange(1000):
+    old.a = i
+    assert old.a == i
+

test/tests/tuples.py

@@ -27,6 +27,8 @@ print (2,) < (2,)
 print (2,) < (2, 3)
 print (3,) < (2, 3)
 
+print () is (), () is tuple(), tuple() is tuple()
+
 print
 
 class T(object):