add generator.__repr__

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/generator/GeneratorBuiltins.java

@@ -27,6 +27,7 @@
 
 import static com.oracle.graal.python.nodes.SpecialMethodNames.__ITER__;
 import static com.oracle.graal.python.nodes.SpecialMethodNames.__NEXT__;
+import static com.oracle.graal.python.nodes.SpecialMethodNames.__REPR__;
 import static com.oracle.graal.python.runtime.exception.PythonErrorType.StopIteration;
 import static com.oracle.graal.python.runtime.exception.PythonErrorType.TypeError;
 
@@ -52,6 +53,7 @@
 import com.oracle.truffle.api.CallTarget;
 import com.oracle.truffle.api.RootCallTarget;
 import com.oracle.truffle.api.Truffle;
+import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.GenerateNodeFactory;
 import com.oracle.truffle.api.dsl.NodeFactory;
@@ -220,4 +222,14 @@ Object getCode(PGenerator self,
             return code;
         }
     }
+
+    @Builtin(name = __REPR__, fixedNumOfPositionalArgs = 1)
+    @GenerateNodeFactory
+    abstract static class ReprNode extends PythonUnaryBuiltinNode {
+        @Specialization
+        @TruffleBoundary
+        String repr(PGenerator self) {
+            return self.toString();
+        }
+    }
 }