External string table.

test/cctest/test-api.cc

 // Copyright 2007-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 429 matching lines @@
     i::Heap::CollectGarbage(0, i::NEW_SPACE);  // in survivor space now
     i::Heap::CollectGarbage(0, i::NEW_SPACE);  // in old gen now
     i::Handle<i::String> isymbol = i::Factory::SymbolFromString(istring);
     CHECK(isymbol->IsSymbol());
   }
   i::Heap::CollectAllGarbage(false);
   i::Heap::CollectAllGarbage(false);
 }
 
 
+THREADED_TEST(ScavengeExternalString) {
+  TestResource::dispose_count = 0;
+  {
+    v8::HandleScope scope;
+    uint16_t* two_byte_string = AsciiToTwoByteString("test string");
+    Local<String> string =
+        String::NewExternal(new TestResource(two_byte_string));
+    i::Handle<i::String> istring = v8::Utils::OpenHandle(*string);
+    i::Heap::CollectGarbage(0, i::NEW_SPACE);
+    CHECK(i::Heap::InNewSpace(*istring));
+    CHECK_EQ(0, TestResource::dispose_count);
+  }
+  i::Heap::CollectGarbage(0, i::NEW_SPACE);
+  CHECK_EQ(1, TestResource::dispose_count);
+}
+
+
+THREADED_TEST(ScavengeExternalAsciiString) {
+  TestAsciiResource::dispose_count = 0;
+  {
+    v8::HandleScope scope;
+    const char* one_byte_string = "test string";
+    Local<String> string = String::NewExternal(
+        new TestAsciiResource(i::StrDup(one_byte_string)));
+    i::Handle<i::String> istring = v8::Utils::OpenHandle(*string);
+    i::Heap::CollectGarbage(0, i::NEW_SPACE);
+    CHECK(i::Heap::InNewSpace(*istring));
+    CHECK_EQ(0, TestAsciiResource::dispose_count);
+  }
+  i::Heap::CollectGarbage(0, i::NEW_SPACE);
+  CHECK_EQ(1, TestAsciiResource::dispose_count);
+}
+
+
 THREADED_TEST(StringConcat) {
   {
     v8::HandleScope scope;
     LocalContext env;
     const char* one_byte_string_1 = "function a_times_t";
     const char* two_byte_string_1 = "wo_plus_b(a, b) {return ";
     const char* one_byte_extern_1 = "a * 2 + b;} a_times_two_plus_b(4, 8) + ";
     const char* two_byte_extern_1 = "a_times_two_plus_b(4, 8) + ";
     const char* one_byte_string_2 = "a_times_two_plus_b(4, 8) + ";
     const char* two_byte_string_2 = "a_times_two_plus_b(4, 8) + ";
@@ skipping 8145 matching lines @@
     CompileRun(source_exception);
     other_context->Exit();
     v8::internal::Heap::CollectAllGarbage(false);
     if (GetGlobalObjectsCount() == 1) break;
   }
   CHECK_GE(2, gc_count);
   CHECK_EQ(1, GetGlobalObjectsCount());
 
   other_context.Dispose();
 }