Implement builtin function id()

Currently returns the address if the Box*

src/runtime/builtin_modules/builtins.cpp

@@ -180,6 +180,12 @@ extern "C" Box* sum(Box* container, Box* initial) {
     return cur;
 }
 
+extern "C" Box* id(Box* arg) {
+    i64 addr = (i64)(arg);
+    return boxInt(addr);
+}
+
+
 Box* open(Box* arg1, Box* arg2) {
     assert(arg2);
 
@@ -494,6 +500,8 @@ void setupBuiltins() {
     builtins_module->giveAttr("sum",
                               new BoxedFunction(boxRTFunction((void*)sum, UNKNOWN, 2, 1, false, false), { boxInt(0) }));
 
+    id_obj = new BoxedFunction(boxRTFunction((void*)id, BOXED_INT, 1));
+    builtins_module->giveAttr("id", id_obj);
     chr_obj = new BoxedFunction(boxRTFunction((void*)chr, STR, 1));
     builtins_module->giveAttr("chr", chr_obj);
     ord_obj = new BoxedFunction(boxRTFunction((void*)ord, BOXED_INT, 1));

src/runtime/types.cpp

@@ -405,6 +405,8 @@ extern "C" BoxedString* functionRepr(BoxedFunction* v) {
         return boxStrConstant("<built-in function max>");
     if (v == open_obj)
         return boxStrConstant("<built-in function open>");
+    if (v == id_obj)
+        return boxStrConstant("<built-in function id>");
     if (v == chr_obj)
         return boxStrConstant("<built-in function chr>");
     if (v == ord_obj)
@@ -422,6 +424,7 @@ Box* abs_obj = NULL;
 Box* min_obj = NULL;
 Box* max_obj = NULL;
 Box* open_obj = NULL;
+Box* id_obj = NULL;
 Box* chr_obj = NULL;
 Box* ord_obj = NULL;
 Box* trap_obj = NULL;

src/runtime/types.h

@@ -81,8 +81,8 @@ extern const ObjectFlavor object_flavor, type_flavor, bool_flavor, int_flavor, f
 }
 extern "C" { extern Box* None, *NotImplemented, *True, *False; }
 extern "C" {
-extern Box* repr_obj, *len_obj, *hash_obj, *range_obj, *abs_obj, *min_obj, *max_obj, *open_obj, *chr_obj, *ord_obj,
-    *trap_obj;
+extern Box* repr_obj, *len_obj, *hash_obj, *range_obj, *abs_obj, *min_obj, *max_obj, *open_obj, *id_obj, *chr_obj,
+    *ord_obj, *trap_obj;
 } // these are only needed for functionRepr, which is hacky
 extern "C" { extern BoxedModule* sys_module, *builtins_module, *math_module, *time_module, *thread_module; }
 

test/tests/id.py

+x = 'Hi'
+y = 1
+z = (42, 7)
+f = (2,) + z
+id(x)
+id(y)
+id(z)
+id(f)