From a781578b416c502e642ab465da3344abd419475f Mon Sep 17 00:00:00 2001
From: Gaming4JC <g4jc@hyperbola.info>
Date: Sun, 16 Jun 2019 11:30:20 -0400
Subject: 1283712 - Part 9: Add getErrorNotes testing function to extract error
 notes from exception.

---
 js/src/builtin/TestingFunctions.cpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/js/src/builtin/TestingFunctions.cpp b/js/src/builtin/TestingFunctions.cpp
index 982c9e386..992fe2c97 100644
--- a/js/src/builtin/TestingFunctions.cpp
+++ b/js/src/builtin/TestingFunctions.cpp
@@ -4043,6 +4043,32 @@ IsConstructor(JSContext* cx, unsigned argc, Value* vp)
     return true;
 }
 
+static bool
+GetErrorNotes(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    if (!args.requireAtLeast(cx, "getErrorNotes", 1))
+        return false;
+
+    if (!args[0].isObject() || !args[0].toObject().is<ErrorObject>()) {
+        args.rval().setNull();
+        return true;
+    }
+
+    JSErrorReport* report = args[0].toObject().as<ErrorObject>().getErrorReport();
+    if (!report) {
+        args.rval().setNull();
+        return true;
+    }
+
+    RootedObject notesArray(cx, CreateErrorNotesArray(cx, report));
+    if (!notesArray)
+        return false;
+
+    args.rval().setObject(*notesArray);
+    return true;
+}
+
 static const JSFunctionSpecWithHelp TestingFunctions[] = {
     JS_FN_HELP("gc", ::GC, 0, 0,
 "gc([obj] | 'zone' [, 'shrinking'])",
@@ -4577,6 +4603,10 @@ static const JSFunctionSpecWithHelp FuzzingUnsafeTestingFunctions[] = {
 "  Dumps RegExp bytecode."),
 #endif
 
+    JS_FN_HELP("getErrorNotes", GetErrorNotes, 1, 0,
+"getErrorNotes(error)",
+"  Returns an array of error notes."),
+
     JS_FS_HELP_END
 };
 
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