From bbf1c0105bf89c38cf6d5713d12d2355822336a3 Mon Sep 17 00:00:00 2001
From: Virag Orkenyi <orkvi@inf.u-szeged.hu>
Date: Tue, 20 Jul 2021 11:32:20 +0200
Subject: [PATCH] Add custom dispatcher to builtin-json. (#4679)

JerryScript-DCO-1.0-Signed-off-by: Orkenyi Virag orkvi@inf.u-szeged.hu
---
 .../ecma/builtin-objects/ecma-builtin-json.c  | 60 ++++++++++++++++---
 .../builtin-objects/ecma-builtin-json.inc.h   |  4 +-
 2 files changed, 54 insertions(+), 10 deletions(-)

diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-json.c b/jerry-core/ecma/builtin-objects/ecma-builtin-json.c
index df8b32c15..f332c59e8 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-json.c
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-json.c
@@ -35,6 +35,21 @@
 #define ECMA_BUILTINS_INTERNAL
 #include "ecma-builtins-internal.h"
 
+/**
+ * This object has a custom dispatch function.
+ */
+#define BUILTIN_CUSTOM_DISPATCH
+
+/**
+ * List of built-in routine identifiers.
+ */
+enum
+{
+  ECMA_BUILTIN_JSON_ROUTINE_START = 0,
+  ECMA_BUILTIN_JSON_PARSE,
+  ECMA_BUILTIN_JSON_STRINGIFY,
+};
+
 #define BUILTIN_INC_HEADER_NAME "ecma-builtin-json.inc.h"
 #define BUILTIN_UNDERSCORED_ID json
 #include "ecma-builtin-internal-routines-template.inc.h"
@@ -831,12 +846,9 @@ ecma_builtin_json_parse_buffer (const lit_utf8_byte_t * str_start_p, /**< String
  *         Returned value must be freed with ecma_free_value.
  */
 static ecma_value_t
-ecma_builtin_json_parse (ecma_value_t this_arg, /**< 'this' argument */
-                         ecma_value_t arg1, /**< string argument */
+ecma_builtin_json_parse (ecma_value_t arg1, /**< string argument */
                          ecma_value_t arg2) /**< reviver argument */
 {
-  JERRY_UNUSED (this_arg);
-
   ecma_string_t *text_string_p = ecma_op_to_string (arg1);
 
   if (JERRY_UNLIKELY (text_string_p == NULL))
@@ -1544,13 +1556,10 @@ ecma_builtin_json_stringify_no_opts (const ecma_value_t value) /**< value to str
  *         Returned value must be freed with ecma_free_value.
  */
 static ecma_value_t
-ecma_builtin_json_stringify (ecma_value_t this_arg, /**< 'this' argument */
-                             ecma_value_t arg1,  /**< value */
+ecma_builtin_json_stringify (ecma_value_t arg1,  /**< value */
                              ecma_value_t arg2,  /**< replacer */
                              ecma_value_t arg3)  /**< space */
 {
-  JERRY_UNUSED (this_arg);
-
   ecma_json_stringify_context_t context;
   context.replacer_function_p = NULL;
   context.property_list_p = NULL;
@@ -1789,6 +1798,41 @@ ecma_builtin_json_stringify (ecma_value_t this_arg, /**< 'this' argument */
   return ret_value;
 } /* ecma_builtin_json_stringify */
 
+/**
+ * Dispatcher of the built-in's routines
+ *
+ * @return ecma value
+ *         Returned value must be freed with ecma_free_value.
+ */
+ecma_value_t
+ecma_builtin_json_dispatch_routine (uint8_t builtin_routine_id, /**< built-in wide routine identifier */
+                                    ecma_value_t this_arg, /**< 'this' argument value */
+                                    const ecma_value_t arguments_list_p[], /**< list of arguments
+                                                                            *   passed to routine */
+                                    uint32_t arguments_number) /**< length of arguments' list */
+{
+  JERRY_UNUSED (this_arg);
+  ecma_value_t arg1 = (arguments_number > 0) ? arguments_list_p[0] : ECMA_VALUE_UNDEFINED;
+  ecma_value_t arg2 = (arguments_number > 1) ? arguments_list_p[1] : ECMA_VALUE_UNDEFINED;
+  ecma_value_t arg3 = (arguments_number > 2) ? arguments_list_p[2] : ECMA_VALUE_UNDEFINED;
+
+  switch (builtin_routine_id)
+  {
+    case ECMA_BUILTIN_JSON_PARSE:
+    {
+      return ecma_builtin_json_parse (arg1, arg2);
+    }
+    case ECMA_BUILTIN_JSON_STRINGIFY:
+    {
+      return ecma_builtin_json_stringify (arg1, arg2, arg3);
+    }
+    default:
+    {
+      JERRY_UNREACHABLE ();
+    }
+  }
+} /* ecma_builtin_json_dispatch_routine */
+
 /**
  * @}
  * @}
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-json.inc.h b/jerry-core/ecma/builtin-objects/ecma-builtin-json.inc.h
index 0172e7453..e83345f8a 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-json.inc.h
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-json.inc.h
@@ -30,8 +30,8 @@ STRING_VALUE (LIT_GLOBAL_SYMBOL_TO_STRING_TAG,
 
 /* Routine properties:
  *  (property name, C routine name, arguments number or NON_FIXED, value of the routine's length property) */
-ROUTINE (LIT_MAGIC_STRING_PARSE, ecma_builtin_json_parse, 2, 2)
-ROUTINE (LIT_MAGIC_STRING_STRINGIFY, ecma_builtin_json_stringify, 3, 3)
+ROUTINE (LIT_MAGIC_STRING_PARSE, ECMA_BUILTIN_JSON_PARSE, 2, 2)
+ROUTINE (LIT_MAGIC_STRING_STRINGIFY, ECMA_BUILTIN_JSON_STRINGIFY, 3, 3)
 
 #endif /* JERRY_BUILTIN_JSON */