Regression test for existing bug in String::MakeExternal.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/20713002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15903 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/cctest.status

@@ -42,6 +42,9 @@ test-serialize/DependentTestThatAlwaysFails: FAIL
 # This test always fails.  It tests that LiveEdit causes abort when turned off.
 test-debug/LiveEditDisabled: FAIL
 
+# TODO(yangguo,mstarzinger): Fix bug in String::MakeExternal.
+test-api/MakingExternalUnalignedAsciiString: PASS || CRASH
+
 # TODO(gc): Temporarily disabled in the GC branch.
 test-log/EquivalenceOfLoggingAndTraversal: PASS || FAIL
 

test/cctest/test-api.cc

@@ -621,6 +621,33 @@ TEST(MakingExternalAsciiStringConditions) {
 }
 
 
+TEST(MakingExternalUnalignedAsciiString) {
+  LocalContext env;
+  v8::HandleScope scope(env->GetIsolate());
+
+  // Create a cons string that will land in old pointer space.
+  Local<String> string = Local<String>::Cast(CompileRun(
+      "function cons(a, b) { return a + b; }"
+      "cons('abcdefghijklm', 'nopqrstuvwxyz');"));
+
+  // Trigger GCs so that the newly allocated string moves to old gen.
+  SimulateFullSpace(HEAP->old_pointer_space());
+  HEAP->CollectGarbage(i::NEW_SPACE);  // in survivor space now
+  HEAP->CollectGarbage(i::NEW_SPACE);  // in old gen now
+
+  // Turn into external string with unaligned resource data.
+  int dispose_count = 0;
+  const char* c_source = "_abcdefghijklmnopqrstuvwxyz";
+  bool success = string->MakeExternal(
+      new TestAsciiResource(i::StrDup(c_source) + 1, &dispose_count));
+  CHECK(success);
+
+  // Trigger GCs and force evacuation.
+  HEAP->CollectAllGarbage(i::Heap::kNoGCFlags);
+  HEAP->CollectAllGarbage(i::Heap::kReduceMemoryFootprintMask);
+}
+
+
 THREADED_TEST(UsingExternalString) {
   i::Factory* factory = i::Isolate::Current()->factory();
   {