Introduce short external strings without pointer cache.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 5e76de71bb9ba11fd5ea03b0da98e6f6d34891b2..1416d7d74bcc471ba0eece12bf11397b9ee725b1 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -491,7 +491,7 @@ TEST(MakingExternalStringConditions) {
   HEAP->CollectGarbage(i::NEW_SPACE);
   HEAP->CollectGarbage(i::NEW_SPACE);
 
-  uint16_t* two_byte_string = AsciiToTwoByteString("abcdefghi");
+  uint16_t* two_byte_string = AsciiToTwoByteString("small");

[Lasse Reichstein, 2011/11/23 08:43:20]

Whether the externalized version of this string is short or not depends on the
size of pointers. On 64-bit it will be short, on 32-bit it won't.
Maybe we should select a string based on kPointerSize instead, for tests like
this, so it tests the same thing on all platforms.

[Yang, 2011/11/23 09:58:48]

I changed the string lengths to get short external for the first test and normal
external for the second test on all platforms.

   Local<String> small_string = String::New(two_byte_string);
   i::DeleteArray(two_byte_string);
 
@@ -503,7 +503,7 @@ TEST(MakingExternalStringConditions) {
   // Old space strings should be accepted.
   CHECK(small_string->CanMakeExternal());
 
-  two_byte_string = AsciiToTwoByteString("abcdefghi");
+  two_byte_string = AsciiToTwoByteString("small 2");
   small_string = String::New(two_byte_string);
   i::DeleteArray(two_byte_string);
 
@@ -537,7 +537,7 @@ TEST(MakingExternalAsciiStringConditions) {
   HEAP->CollectGarbage(i::NEW_SPACE);
   HEAP->CollectGarbage(i::NEW_SPACE);
 
-  Local<String> small_string = String::New("abcdefghi");
+  Local<String> small_string = String::New("small");
   // We should refuse to externalize newly created small string.
   CHECK(!small_string->CanMakeExternal());
   // Trigger GCs so that the newly allocated string moves to old gen.
@@ -546,7 +546,7 @@ TEST(MakingExternalAsciiStringConditions) {
   // Old space strings should be accepted.
   CHECK(small_string->CanMakeExternal());
 
-  small_string = String::New("abcdefghi");
+  small_string = String::New("small 2");
   // We should refuse externalizing newly created small string.
   CHECK(!small_string->CanMakeExternal());
   for (int i = 0; i < 100; i++) {