Add API call that identifies strings that are guaranteed

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
===================================================================
--- test/cctest/test-api.cc	(revision 11074)
+++ test/cctest/test-api.cc	(working copy)
@@ -5770,6 +5770,8 @@
       Local<v8::String>::Cast(a->Get(i));
     Local<v8::Number> expected_len =
       Local<v8::Number>::Cast(alens->Get(i));
+    CHECK_EQ((expected_len->Value() != string->Length()),
+          string->MayContainNonAscii());

[fschneider, 2012/03/19 08:46:31]

Fix indentation here.

[Erik Corry, 2012/03/19 09:51:02]

Done.

     int length = GetUtf8Length(string);
     CHECK_EQ(static_cast<int>(expected_len->Value()), length);
   }
@@ -11927,6 +11929,9 @@
         "var slice = lhs.substring(1, lhs.length - 1);"
         "var slice_on_cons = (lhs + rhs).substring(1, lhs.length *2 - 1);");
 
+    CHECK(!lhs->MayContainNonAscii());
+    CHECK(!rhs->MayContainNonAscii());
+
     MorphAString(*v8::Utils::OpenHandle(*lhs), &ascii_resource, &uc16_resource);
     MorphAString(*v8::Utils::OpenHandle(*rhs), &ascii_resource, &uc16_resource);