Add test for typing.py and fix the issues it uncovers

src/asm_writing/icinfo.cpp

@@ -41,9 +41,14 @@ int64_t ICInvalidator::version() {
 }
 
 ICInvalidator::~ICInvalidator() {
-    for (ICSlotInfo* slot : dependents) {
-        slot->invalidators.erase(std::find(slot->invalidators.begin(), slot->invalidators.end(), this));
-    }
+    // It's not clear what we should do if there are any dependencies still tracked
+    // when this object is deleted.  The most likely thing is that we should invalidate
+    // them, since whatever caused the destruction is most likely an invalidation event
+    // as well.
+    // For now, let's just assert on this to know if it happens.  In the unlikely
+    // case that we want to just ignore any existing dependents (old behavior), we
+    // can add a new API call to forget them (and remove from the dependents' `invalidators` list)
+    ASSERT(dependents.empty(), "dependents left when ICInvalidator destructed");
 }
 
 void ICInvalidator::addDependent(ICSlotInfo* entry_info) {

src/runtime/hiddenclass.h

@@ -165,6 +165,7 @@ class HiddenClassSingleton final : public HiddenClassSingletonOrNormal {
     void appendAttrwrapper();
     void delAttribute(BoxedString* attr);
     void addDependence(Rewriter* rewriter);
+    void invalidateAll() { dependent_getattrs.invalidateAll(); }
 
     friend class HiddenClass;
 };

src/runtime/objmodel.cpp

@@ -636,6 +636,10 @@ void BoxedClass::freeze() {
     assert(!is_constant);
     assert(tp_name); // otherwise debugging will be very hard
 
+    auto doc_str = getStaticString("__doc__");
+    if (!hasattr(doc_str))
+        giveAttr(incref(doc_str), boxString(tp_name));
+
     fixup_slot_dispatchers(this);
 
     if (instancesHaveDictAttrs() || instancesHaveHCAttrs()) {
@@ -1318,8 +1322,10 @@ void HCAttrs::_clearRaw() noexcept {
     auto old_attr_list_size = hcls->attributeArraySize();
 
     // singleton classes will not get reused so free it
-    if (hcls->type == HiddenClass::SINGLETON)
+    if (hcls->type == HiddenClass::SINGLETON) {
+        hcls->getAsSingleton()->invalidateAll();
         delete hcls;
+    }
     new ((void*)this) HCAttrs(NULL);
 
     if (old_attr_list) {

src/runtime/set.cpp

@@ -158,7 +158,7 @@ BoxedSet* makeNewSet(BoxedClass* cls, Box* container) {
 }
 
 Box* frozensetNew(Box* _cls, Box* container, BoxedDict* kwargs) {
-    RELEASE_ASSERT(_cls->cls == type_cls, "");
+    RELEASE_ASSERT(PyType_Check(_cls), "");
     BoxedClass* cls = static_cast<BoxedClass*>(_cls);
     RELEASE_ASSERT(isSubclass(cls, frozenset_cls), "");
     if (_cls == frozenset_cls && !_PyArg_NoKeywords("frozenset()", kwargs)) {
@@ -191,7 +191,7 @@ Box* frozensetNew(Box* _cls, Box* container, BoxedDict* kwargs) {
 }
 
 Box* setNew(Box* _cls, Box* container, BoxedDict* kwargs) {
-    RELEASE_ASSERT(_cls->cls == type_cls, "");
+    RELEASE_ASSERT(PyType_Check(_cls), "");
     BoxedClass* cls = static_cast<BoxedClass*>(_cls);
     RELEASE_ASSERT(isSubclass(cls, set_cls), "");
 

src/runtime/types.cpp

@@ -1604,7 +1604,11 @@ static Box* function_new(BoxedClass* cls, Box* _code, Box* globals, Box** _args)
     Box* defaults = _args[1];
     Box* closure = _args[2];
 
-    RELEASE_ASSERT(PyCode_Check(_code), "");
+    if (!PyCode_Check(_code)) {
+        PyErr_Format(TypeError, "function() argument 1 must be code, not %200s", _code->cls->tp_name);
+        return NULL;
+    }
+
     BoxedCode* code = static_cast<BoxedCode*>(_code);
 
     if (name != Py_None && !PyString_Check(name)) {
@@ -1787,6 +1791,17 @@ static Box* functionNonzero(BoxedFunction* self) {
     Py_RETURN_TRUE;
 }
 
+static Box* im_doc(Box* b, void*) noexcept {
+    RELEASE_ASSERT(b->cls == instancemethod_cls, "");
+    auto doc_str = getStaticString("__doc__");
+    try {
+        return getattr(static_cast<BoxedInstanceMethod*>(b)->func, doc_str);
+    } catch (ExcInfo e) {
+        setCAPIException(e);
+        return NULL;
+    }
+}
+
 extern "C" {
 Box* Py_None = NULL;
 Box* NotImplemented = NULL;
@@ -4231,6 +4246,10 @@ void setupRuntime() {
     Py_INCREF(Py_None);
     object_cls->giveAttr("__base__", Py_None);
 
+    object_cls->giveAttr("__doc__", boxString("The most base type"));
+    type_cls->giveAttr("__doc__",
+                       boxString("type(object) -> the object's type\ntype(name, bases, dict) -> a new type"));
+
     // Not sure why CPython defines sizeof(PyTupleObject) to include one element,
     // but we copy that, which means we have to subtract that extra pointer to get the tp_basicsize:
     tuple_cls = new (0) BoxedClass(object_cls, 0, 0, sizeof(BoxedTuple) - sizeof(Box*), false, "tuple", true,
@@ -4569,10 +4588,14 @@ void setupRuntime() {
     instancemethod_cls->giveAttrBorrowed("__func__", instancemethod_cls->getattr(getStaticString("im_func")));
     instancemethod_cls->giveAttrMember("im_self", T_OBJECT, offsetof(BoxedInstanceMethod, obj));
     instancemethod_cls->giveAttrBorrowed("__self__", instancemethod_cls->getattr(getStaticString("im_self")));
-    instancemethod_cls->freeze();
 
     instancemethod_cls->giveAttrMember("im_class", T_OBJECT, offsetof(BoxedInstanceMethod, im_class), true);
 
+    // TODO: this should be handled via a getattro instead (which proxies to the function):
+    instancemethod_cls->giveAttrDescriptor("__doc__", im_doc, NULL);
+
+    instancemethod_cls->freeze();
+
     slice_cls->giveAttr("__new__",
                         new BoxedFunction(BoxedCode::create((void*)sliceNew, UNKNOWN, 4, false, false, "slice.__new__"),
                                           { NULL, Py_None }));

test/integration/typing_test.py

@@ -0,0 +1,42 @@
+import os, sys, subprocess, shutil
+sys.path.append(os.path.dirname(__file__) + "/../lib")
+
+from test_helper import create_virtenv, run_test
+
+ENV_NAME = "typing_test_env_" + os.path.basename(sys.executable)
+ENV_DIR = os.path.abspath(ENV_NAME)
+PYTHON_EXE = os.path.abspath(os.path.join(ENV_NAME, "bin", "python"))
+
+pkg = ["typing==3.5.2.2"]
+# pkg = ["git+https://github.com/python/[email protected]"]
+
+create_virtenv(ENV_NAME, pkg, force_create=False)
+
+# subprocess.check_call([PYTHON_EXE, os.path.join(ENV_DIR, "lib", "python2.7", "site-packages", "typing", "test_typing.py")])
+# subprocess.check_call([PYTHON_EXE, "-m", "test_typing"])
+
+print "Running some extra tests:"
+test_fn = os.path.join(ENV_DIR, "test.py")
+with open(test_fn, 'w') as f:
+    f.write( """
+import sys
+
+from typing import Generic, TypeVar, Sequence
+RR = TypeVar('RR')
+
+for i in xrange(1000):
+    Generic[RR]
+    Sequence[RR]
+
+print "Passed"
+""")
+subprocess.check_call([PYTHON_EXE, test_fn])
+
+print "Running typing's own tests:"
+import urllib
+test_file = urllib.urlopen("https://raw.githubusercontent.com/python/typing/1e4c0bae6f797ee5878ce4bb30f3b03c679e3e11/python2/test_typing.py").read()
+test_fn = os.path.join(ENV_DIR, "test_typing.py")
+with open(test_fn, 'w') as f:
+    f.write(test_file)
+subprocess.check_call([PYTHON_EXE, test_fn])
+