From f92f3340b6c56c01596039146c5267c594cfef13 Mon Sep 17 00:00:00 2001
From: Bryan Thrall <bthrall@mozilla.com>
Date: Fri, 2 Feb 2024 19:08:17 +0000
Subject: [PATCH] Bug 1860887 - Enable JSON.parse with source when configured
 r=jandem

Differential Revision: https://phabricator.services.mozilla.com/D198319
---
 js/moz.configure                    | 18 ++++++++++++++++++
 js/src/builtin/TestingFunctions.cpp |  9 +++++++++
 2 files changed, 27 insertions(+)

diff --git a/js/moz.configure b/js/moz.configure
index cb2a3c833f72a..edaa33825afa9 100644
--- a/js/moz.configure
+++ b/js/moz.configure
@@ -173,6 +173,24 @@ def enable_decorators(value):
 set_config("ENABLE_DECORATORS", enable_decorators)
 set_define("ENABLE_DECORATORS", enable_decorators)
 
+# Enable JSON.parse with source
+# ===================================================
+option(
+    "--enable-json-parse-with-source",
+    default=moz_debug,
+    help="Enable experimental JS JSON.parse with source support",
+)
+
+
+@depends("--enable-json-parse-with-source", moz_debug)
+def enable_json_parse_with_source(value, moz_debug):
+    if value or moz_debug:
+        return True
+
+
+set_config("ENABLE_JSON_PARSE_WITH_SOURCE", enable_json_parse_with_source)
+set_define("ENABLE_JSON_PARSE_WITH_SOURCE", enable_json_parse_with_source)
+
 
 # Portable Baseline Intepreter
 # =======================================================
diff --git a/js/src/builtin/TestingFunctions.cpp b/js/src/builtin/TestingFunctions.cpp
index b4c3b6bf69870..f2fe91808a327 100644
--- a/js/src/builtin/TestingFunctions.cpp
+++ b/js/src/builtin/TestingFunctions.cpp
@@ -619,6 +619,15 @@ static bool GetBuildConfiguration(JSContext* cx, unsigned argc, Value* vp) {
     return false;
   }
 
+#ifdef ENABLE_JSON_PARSE_WITH_SOURCE
+  value = BooleanValue(true);
+#else
+  value = BooleanValue(false);
+#endif
+  if (!JS_SetProperty(cx, info, "json-parse-with-source", value)) {
+    return false;
+  }
+
 #ifdef FUZZING
   value = BooleanValue(true);
 #else