Added 'instanceof' binary operation to the API (#2751)

Added 'JERRY_BIN_OP_INSTANCEOF' to 'jerry_binary_operation_t' and
'jerry_binary_operation'. Added unit tests for this new operation
and updated the documentations.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

docs/02.API-REFERENCE.md

@@ -286,6 +286,7 @@ Enum that contains the supported binary operation types
  - JERRY_BIN_OP_LESS_EQUAL - less or equal relation (<=)
  - JERRY_BIN_OP_GREATER - greater relation (>)
  - JERRY_BIN_OP_GREATER_EQUAL - greater or equal relation (>=)
+ - JERRY_BIN_OP_INSTANCEOF - instanceof operation
 
 
 ## jerry_property_descriptor_t
@@ -1092,6 +1093,7 @@ jerry_get_global_object (void);
 - [jerry_release_value](#jerry_release_value)
 - [jerry_define_own_property](#jerry_define_own_property)
 
+
 # Checker functions
 
 Functions to check the type of an API value ([jerry_value_t](#jerry_value_t)).
@@ -1741,7 +1743,7 @@ jerry_binary_operation (jerry_binary_operation_t op,
   - error, if argument has an error flag or operation is unsuccessful or unsupported
   - true/false, the result of the binary operation on the given operands otherwise
 
-**Example**
+**Example - JERRY_BIN_OP_EQUAL**
 
 ```c
 {
@@ -1772,6 +1774,59 @@ jerry_binary_operation (jerry_binary_operation_t op,
 }
 ```
 
+**Example - JERRY_BIN_OP_INSTANCEOF**
+
+[doctest]: # ()
+
+```c
+#include "jerryscript.h"
+
+static jerry_value_t
+my_constructor (const jerry_value_t func_val,
+                const jerry_value_t this_val,
+                const jerry_value_t argv[],
+                const jerry_length_t argc)
+{
+  return jerry_create_undefined ();
+}
+
+int
+main (void)
+{
+  jerry_init (JERRY_INIT_EMPTY);
+
+  jerry_value_t base_obj = jerry_create_object ();
+  jerry_value_t constructor = jerry_create_external_function (my_constructor);
+
+  /* External functions does not have a prototype by default, so we need to create one */
+  jerry_value_t prototype_str = jerry_create_string ((const jerry_char_t *) ("prototype"));
+  jerry_release_value (jerry_set_property (constructor, prototype_str, base_obj));
+  jerry_release_value (prototype_str);
+
+  /* Construct the instance. */
+  jerry_value_t instance_val = jerry_construct_object (constructor, NULL, 0);
+
+  /* Call the API function of 'instanceof'. */
+  jerry_value_t is_instance = jerry_binary_operation (JERRY_BIN_OP_INSTANCEOF,
+                                                      instance_val,
+                                                      constructor);
+  if (!jerry_value_is_error (is_instance)
+      && jerry_get_boolean_value (is_instance) == true)
+  {
+    /* ... */
+  }
+
+  /* Free all of the jerry values and cleanup the engine. */
+  jerry_release_value (base_obj);
+  jerry_release_value (constructor);
+  jerry_release_value (instance_val);
+  jerry_release_value (is_instance);
+
+  jerry_cleanup ();
+  return 0;
+}
+```
+
 **See also**
 - [jerry_binary_operation_t](#jerry_binary_operation_t)
 

jerry-core/api/jerry.c

@@ -947,6 +947,17 @@ jerry_binary_operation (jerry_binary_operation_t op, /**< operation */
     {
       return jerry_return (opfunc_relation (lhs, rhs, true, true));
     }
+    case JERRY_BIN_OP_INSTANCEOF:
+    {
+      if (!ecma_is_value_object (lhs)
+          || !ecma_op_is_callable (rhs))
+      {
+        return jerry_throw (ecma_raise_type_error (ECMA_ERR_MSG (wrong_args_msg_p)));
+      }
+
+      ecma_object_t *proto_obj_p = ecma_get_object_from_value (rhs);
+      return jerry_return (ecma_op_object_has_instance (proto_obj_p, lhs));
+    }
     default:
     {
       return jerry_throw (ecma_raise_type_error (ECMA_ERR_MSG ("Unsupported binary operation")));

jerry-core/ecma/operations/ecma-function-object.c

@@ -391,7 +391,8 @@ ecma_op_implicit_class_constructor_has_instance (ecma_object_t *func_obj_p, /**<
 /**
  * 15.3.5.3 implementation of [[HasInstance]] for Function objects
  *
- * @return ecma value
+ * @return true/false - if arguments are valid
+ *         error - otherwise
  *         Returned value must be freed with ecma_free_value
  */
 ecma_value_t

jerry-core/include/jerryscript-core.h

@@ -313,12 +313,13 @@ typedef struct jerry_context_t jerry_context_t;
  */
 typedef enum
 {
-  JERRY_BIN_OP_EQUAL = 0u,   /**< equal comparison (==) */
-  JERRY_BIN_OP_STRICT_EQUAL, /**< strict equal comparison (===) */
-  JERRY_BIN_OP_LESS,         /**< less relation (<) */
-  JERRY_BIN_OP_LESS_EQUAL,   /**< less or equal relation (<=) */
-  JERRY_BIN_OP_GREATER,      /**< greater relation (>) */
-  JERRY_BIN_OP_GREATER_EQUAL /**< greater or equal relation (>=)*/
+  JERRY_BIN_OP_EQUAL = 0u,    /**< equal comparison (==) */
+  JERRY_BIN_OP_STRICT_EQUAL,  /**< strict equal comparison (===) */
+  JERRY_BIN_OP_LESS,          /**< less relation (<) */
+  JERRY_BIN_OP_LESS_EQUAL,    /**< less or equal relation (<=) */
+  JERRY_BIN_OP_GREATER,       /**< greater relation (>) */
+  JERRY_BIN_OP_GREATER_EQUAL, /**< greater or equal relation (>=)*/
+  JERRY_BIN_OP_INSTANCEOF,    /**< instanceof operation */
 } jerry_binary_operation_t;
 
 /**

tests/unit-core/test-api-binary-operations-instanceof.c

@@ -0,0 +1,122 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "jerryscript.h"
+
+#include "test-common.h"
+
+#define T(lhs, rhs, res) \
+  { lhs, rhs, res }
+
+typedef struct
+{
+  jerry_value_t lhs;
+  jerry_value_t rhs;
+  bool expected;
+} test_entry_t;
+
+static jerry_value_t
+my_constructor (const jerry_value_t func_val, /**< function */
+                const jerry_value_t this_val, /**< this */
+                const jerry_value_t argv[], /**< arguments */
+                const jerry_length_t argc) /**< number of arguments */
+{
+  (void) func_val;
+  (void) this_val;
+  (void) argv;
+  (void) argc;
+  return jerry_create_undefined ();
+} /* my_constructor */
+
+int
+main (void)
+{
+  TEST_INIT ();
+
+  jerry_init (JERRY_INIT_EMPTY);
+
+  jerry_value_t base_obj = jerry_create_object ();
+  jerry_value_t constructor = jerry_create_external_function (my_constructor);
+
+  jerry_value_t no_proto_instance_val = jerry_construct_object (constructor, NULL, 0);
+
+  jerry_value_t prototype_str = jerry_create_string ((const jerry_char_t *) "prototype");
+  jerry_value_t res = jerry_set_property (constructor, prototype_str, base_obj);
+  jerry_release_value (prototype_str);
+  TEST_ASSERT (!jerry_value_is_error (res));
+  jerry_release_value (res);
+
+  jerry_value_t instance_val = jerry_construct_object (constructor, NULL, 0);
+
+  jerry_value_t error = jerry_create_error_from_value (base_obj, false);
+
+  test_entry_t bool_tests[] =
+  {
+    T (jerry_acquire_value (instance_val), jerry_acquire_value (constructor), true),
+    T (jerry_acquire_value (no_proto_instance_val), jerry_acquire_value (constructor), false),
+    T (jerry_acquire_value (base_obj), jerry_acquire_value (constructor), false)
+  };
+
+  for (uint32_t idx = 0; idx < sizeof (bool_tests) / sizeof (test_entry_t); idx++)
+  {
+    jerry_value_t result = jerry_binary_operation (JERRY_BIN_OP_INSTANCEOF,
+                                                   bool_tests[idx].lhs,
+                                                   bool_tests[idx].rhs);
+    TEST_ASSERT (!jerry_value_is_error (result));
+    TEST_ASSERT (jerry_get_boolean_value (result) == bool_tests[idx].expected);
+    jerry_release_value (bool_tests[idx].lhs);
+    jerry_release_value (bool_tests[idx].rhs);
+    jerry_release_value (result);
+  }
+
+  test_entry_t error_tests[] =
+  {
+    T (jerry_acquire_value (constructor), jerry_acquire_value (instance_val), true),
+    T (jerry_create_undefined (), jerry_acquire_value (constructor), true),
+    T (jerry_acquire_value (instance_val), jerry_create_undefined (), true),
+    T (jerry_acquire_value (instance_val), jerry_acquire_value (base_obj), true),
+    T (jerry_acquire_value (error), jerry_acquire_value (constructor), true),
+    T (jerry_acquire_value (instance_val), jerry_acquire_value (error), true),
+    T (jerry_create_string ((const jerry_char_t *) ""), jerry_create_string ((const jerry_char_t *) ""), true),
+    T (jerry_create_string ((const jerry_char_t *) ""), jerry_create_number (5.0), true),
+    T (jerry_create_number (5.0), jerry_create_string ((const jerry_char_t *) ""), true),
+    T (jerry_create_array (1), jerry_create_array (1), true),
+    T (jerry_create_array (1), jerry_create_object (), true),
+    T (jerry_create_object (), jerry_create_array (1), true),
+    T (jerry_create_null (), jerry_create_object (), true),
+    T (jerry_create_object (), jerry_create_string ((const jerry_char_t *) ""), true)
+  };
+
+  for (uint32_t idx = 0; idx < sizeof (error_tests) / sizeof (test_entry_t); idx++)
+  {
+    jerry_value_t result = jerry_binary_operation (JERRY_BIN_OP_INSTANCEOF,
+                                                   error_tests[idx].lhs,
+                                                   error_tests[idx].rhs);
+    TEST_ASSERT (jerry_value_is_error (result) == error_tests[idx].expected);
+    jerry_release_value (error_tests[idx].lhs);
+    jerry_release_value (error_tests[idx].rhs);
+    jerry_release_value (result);
+  }
+
+  jerry_release_value (base_obj);
+  jerry_release_value (constructor);
+  jerry_release_value (error);
+  jerry_release_value (instance_val);
+  jerry_release_value (no_proto_instance_val);
+
+  jerry_cleanup ();
+
+  return 0;
+} /* main */