Heap profiler: aggregate retainers count of equivalent clusters.

test/cctest/test-heap-profiler.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 //
 // Tests for heap profiler
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 
 #include "v8.h"
 #include "heap-profiler.h"
 #include "string-stream.h"
 #include "cctest.h"
@@ skipping 304 matching lines @@
 
   RetainerHeapProfile ret_profile;
   i::AssertNoAllocation no_alloc;
   i::HeapIterator iterator;
   while (iterator.has_next()) {
     i::HeapObject* obj = iterator.next();
     ret_profile.CollectStats(obj);
   }
   RetainerProfilePrinter printer;
   ret_profile.DebugPrintStats(&printer);
-  CHECK_EQ("(global property);1,B;2,C;2", printer.GetRetainers("A"));
+  const char* retainers_of_a = printer.GetRetainers("A");
+  // The order of retainers is unspecified, so we check string length, and
+  // verify each retainer separately.
+  CHECK_EQ(static_cast<int>(strlen("(global property);1,B;2,C;2")),
+           static_cast<int>(strlen(retainers_of_a)));
+  CHECK(strstr(retainers_of_a, "(global property);1") != NULL);
+  CHECK(strstr(retainers_of_a, "B;2") != NULL);
+  CHECK(strstr(retainers_of_a, "C;2") != NULL);
   CHECK_EQ("(global property);2", printer.GetRetainers("B"));
   CHECK_EQ("(global property);1", printer.GetRetainers("C"));
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING