Merge pull request #292 from tjhance/set-function-name

implement setting __name__ for functions

test/tests/classname.py → class_and_func_name.py

@@ -11,19 +11,19 @@ print C
 C.__module__ = 1
 print C
 
-def set_name(cls, name):
+def set_name(obj, name):
     try:
-        cls.__name__ = name
+        obj.__name__ = name
     except Exception as e:
         print type(e), e
-    print cls
+    print obj.__name__
 
-def del_name(cls):
+def del_name(obj):
     try:
-        del cls.__name__
+        del obj.__name__
     except Exception as e:
         print type(e), e
-    print cls.__name__
+    print obj.__name__
 
 set_name(int, "bob")
 #TODO implement __del__ for getset descriptors
@@ -32,3 +32,17 @@ set_name(int, "bob")
 set_name(C, 5)
 set_name(C, "b\0b")
 set_name(C, "car")
+
+def g():
+    pass
+print g.__name__
+set_name(g, "bob")
+set_name(g, 5)
+set_name(g, "b\0b")
+
+f = lambda x : 5
+print f.__name__
+set_name(f, "bob")
+set_name(f, 5)
+set_name(f, "b\0b")
+#del_name(f)

src/runtime/types.cpp

@@ -271,7 +271,7 @@ void BoxIterator::gcHandler(GCVisitor* v) {
 std::string builtinStr("__builtin__");
 
 extern "C" BoxedFunctionBase::BoxedFunctionBase(CLFunction* f)
-    : f(f), closure(NULL), isGenerator(false), ndefaults(0), defaults(NULL) {
+    : f(f), closure(NULL), isGenerator(false), ndefaults(0), defaults(NULL), modname(NULL), name(NULL) {
     if (f->source) {
         this->modname = f->source->parent_module->getattr("__name__", NULL);
     } else {
@@ -285,7 +285,7 @@ extern "C" BoxedFunctionBase::BoxedFunctionBase(CLFunction* f)
 
 extern "C" BoxedFunctionBase::BoxedFunctionBase(CLFunction* f, std::initializer_list<Box*> defaults,
                                                 BoxedClosure* closure, bool isGenerator)
-    : f(f), closure(closure), isGenerator(isGenerator), ndefaults(0), defaults(NULL) {
+    : f(f), closure(closure), isGenerator(isGenerator), ndefaults(0), defaults(NULL), modname(NULL), name(NULL) {
     if (defaults.size()) {
         // make sure to initialize defaults first, since the GC behavior is triggered by ndefaults,
         // and a GC can happen within this constructor:
@@ -305,10 +305,32 @@ extern "C" BoxedFunctionBase::BoxedFunctionBase(CLFunction* f, std::initializer_
     assert(f->num_defaults == ndefaults);
 }
 
+BoxedFunction::BoxedFunction(CLFunction* f) : BoxedFunction(f, {}) {
+}
+
+BoxedFunction::BoxedFunction(CLFunction* f, std::initializer_list<Box*> defaults, BoxedClosure* closure,
+                             bool isGenerator)
+    : BoxedFunctionBase(f, defaults, closure, isGenerator) {
+
+    // TODO eventually we want this to assert(f->source), I think, but there are still
+    // some builtin functions that are BoxedFunctions but really ought to be a type that
+    // we don't have yet.
+    if (f->source) {
+        this->name = static_cast<BoxedString*>(boxString(f->source->getName()));
+    }
+}
+
 extern "C" void functionGCHandler(GCVisitor* v, Box* b) {
     boxGCHandler(v, b);
 
-    BoxedFunctionBase* f = (BoxedFunctionBase*)b;
+    BoxedFunction* f = (BoxedFunction*)b;
+
+    // TODO eventually f->name should always be non-NULL, then there'd be no need for this check
+    if (f->name)
+        v->visit(f->name);
+
+    if (f->modname)
+        v->visit(f->modname);
 
     if (f->closure)
         v->visit(f->closure);
@@ -647,15 +669,19 @@ static Box* functionCall(BoxedFunction* self, Box* args, Box* kwargs) {
 static Box* func_name(Box* b, void*) {
     assert(b->cls == function_cls);
     BoxedFunction* func = static_cast<BoxedFunction*>(b);
-
-    // TODO this isn't right
-    // (For one thing, we need to able to *set* the __name__ of a function, but that probably
-    // should not involve setting the name in the source.)
-    return boxString(func->f->source->getName());
+    RELEASE_ASSERT(func->name != NULL, "func->name is not set");
+    return func->name;
 }
 
-static void func_set_name(Box*, Box*, void*) {
-    RELEASE_ASSERT(0, "not implemented");
+static void func_set_name(Box* b, Box* v, void*) {
+    assert(b->cls == function_cls);
+    BoxedFunction* func = static_cast<BoxedFunction*>(b);
+
+    if (v == NULL || !PyString_Check(v)) {
+        raiseExcHelper(TypeError, "__name__ must be set to a string object");
+    }
+
+    func->name = static_cast<BoxedString*>(v);
 }
 
 static Box* functionNonzero(BoxedFunction* self) {

src/runtime/types.h

@@ -459,6 +459,7 @@ public:
 
     // Accessed via member descriptor
     Box* modname;      // __module__
+    BoxedString* name; // __name__ (should be here or in one of the derived classes?)
 
     BoxedFunctionBase(CLFunction* f);
     BoxedFunctionBase(CLFunction* f, std::initializer_list<Box*> defaults, BoxedClosure* closure = NULL,
@@ -467,10 +468,9 @@ public:
 
 class BoxedFunction : public BoxedFunctionBase {
 public:
-    BoxedFunction(CLFunction* f) : BoxedFunctionBase(f) {}
+    BoxedFunction(CLFunction* f);
     BoxedFunction(CLFunction* f, std::initializer_list<Box*> defaults, BoxedClosure* closure = NULL,
-                  bool isGenerator = false)
-        : BoxedFunctionBase(f, defaults, closure, isGenerator) {}
+                  bool isGenerator = false);
 
     DEFAULT_CLASS(function_cls);
 };