Version 4.9.385.35 (cherry-pick)

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 0825eb1c86e8ebe05ead114eed241c1bb1482e99..2df9503302fef67f2618f5269e3278b86f1497a7 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -2225,7 +2225,11 @@ BUILTIN(DateConstructor) {
   char buffer[128];
   Vector<char> str(buffer, arraysize(buffer));
   ToDateString(time_val, str, isolate->date_cache());
-  return *isolate->factory()->NewStringFromAsciiChecked(str.start());
+  Handle<String> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      isolate->factory()->NewStringFromUtf8(CStrVector(buffer)));
+  return *result;
 }
 
 
@@ -2805,7 +2809,11 @@ BUILTIN(DatePrototypeToDateString) {
   char buffer[128];
   Vector<char> str(buffer, arraysize(buffer));
   ToDateString(date->value()->Number(), str, isolate->date_cache(), kDateOnly);
-  return *isolate->factory()->NewStringFromAsciiChecked(str.start());
+  Handle<String> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      isolate->factory()->NewStringFromUtf8(CStrVector(buffer)));
+  return *result;
 }
 
 
@@ -2845,7 +2853,11 @@ BUILTIN(DatePrototypeToString) {
   char buffer[128];
   Vector<char> str(buffer, arraysize(buffer));
   ToDateString(date->value()->Number(), str, isolate->date_cache());
-  return *isolate->factory()->NewStringFromAsciiChecked(str.start());
+  Handle<String> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      isolate->factory()->NewStringFromUtf8(CStrVector(buffer)));
+  return *result;
 }
 
 
@@ -2856,7 +2868,11 @@ BUILTIN(DatePrototypeToTimeString) {
   char buffer[128];
   Vector<char> str(buffer, arraysize(buffer));
   ToDateString(date->value()->Number(), str, isolate->date_cache(), kTimeOnly);
-  return *isolate->factory()->NewStringFromAsciiChecked(str.start());
+  Handle<String> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      isolate->factory()->NewStringFromUtf8(CStrVector(buffer)));
+  return *result;
 }