Implement vm_throw callback (#4726)

Slightly improve the description of vm_exec_stop callback. JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
2021-08-10 15:50:26 +02:00
parent b6ec9275aa
commit 444806d78a
15 changed files with 399 additions and 22 deletions
@@ -0,0 +1,94 @@
+/* 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 "config.h"
+#include "jerryscript.h"
+
+#include "test-common.h"
+
+static jerry_value_t
+vm_exec_stop_callback (void *user_p)
+{
+  int *int_p = (int *) user_p;
+
+  if (*int_p > 0)
+  {
+    (*int_p)--;
+
+    return jerry_create_undefined ();
+  }
+
+  return jerry_create_string ((const jerry_char_t *) "Abort script");
+} /* vm_exec_stop_callback */
+
+int
+main (void)
+{
+  TEST_INIT ();
+
+  /* Test stopping an infinite loop. */
+  if (!jerry_is_feature_enabled (JERRY_FEATURE_VM_EXEC_STOP))
+  {
+    return 0;
+  }
+
+  jerry_init (JERRY_INIT_EMPTY);
+
+  int countdown = 6;
+  jerry_set_vm_exec_stop_callback (vm_exec_stop_callback, &countdown, 16);
+
+  const jerry_char_t inf_loop_code_src1[] = "while(true) {}";
+  jerry_value_t parsed_code_val = jerry_parse (inf_loop_code_src1,
+                                               sizeof (inf_loop_code_src1) - 1,
+                                               NULL);
+
+  TEST_ASSERT (!jerry_value_is_error (parsed_code_val));
+  jerry_value_t res = jerry_run (parsed_code_val);
+  TEST_ASSERT (countdown == 0);
+
+  TEST_ASSERT (jerry_value_is_error (res));
+
+  jerry_release_value (res);
+  jerry_release_value (parsed_code_val);
+
+  /* A more complex example. Although the callback error is captured
+   * by the catch block, it is automatically thrown again. */
+
+  /* We keep the callback function, only the countdown is reset. */
+  countdown = 6;
+
+  const jerry_char_t inf_loop_code_src2[] = TEST_STRING_LITERAL (
+    "function f() { while (true) ; }\n"
+    "try { f(); } catch(e) {}"
+  );
+
+  parsed_code_val = jerry_parse (inf_loop_code_src2,
+                                 sizeof (inf_loop_code_src2) - 1,
+                                 NULL);
+
+  TEST_ASSERT (!jerry_value_is_error (parsed_code_val));
+  res = jerry_run (parsed_code_val);
+  TEST_ASSERT (countdown == 0);
+
+  /* The result must have an error flag which proves that
+   * the error is thrown again inside the catch block. */
+  TEST_ASSERT (jerry_value_is_error (res));
+
+  jerry_release_value (res);
+  jerry_release_value (parsed_code_val);
+
+  jerry_cleanup ();
+  return 0;
+} /* main */