Fix AddBlock invocations in CpuProfilesCollection.

src/profile-generator.cc

 // Copyright 2010 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 554 matching lines @@
 
 int CpuProfilesCollection::TokenToIndex(int security_token_id) {
   ASSERT(CodeEntry::kNoSecurityToken == -1);
   return security_token_id + 1;  // kNoSecurityToken -> 0, 0 -> 1, ...
 }
 
 
 List<CpuProfile*>* CpuProfilesCollection::GetProfilesList(
     int security_token_id) {
   const int index = TokenToIndex(security_token_id);
-  profiles_by_token_.AddBlock(NULL, profiles_by_token_.length() - index + 1);
+  const int lists_to_add = index - profiles_by_token_.length() + 1;
+  if (lists_to_add > 0) profiles_by_token_.AddBlock(NULL, lists_to_add);
   List<CpuProfile*>* unabridged_list =
       profiles_by_token_[TokenToIndex(CodeEntry::kNoSecurityToken)];
   const int current_count = unabridged_list->length();
   if (profiles_by_token_[index] == NULL) {
     profiles_by_token_[index] = new List<CpuProfile*>(current_count);
   }
   List<CpuProfile*>* list = profiles_by_token_[index];
-  list->AddBlock(NULL, current_count - list->length());
+  const int profiles_to_add = current_count - list->length();
+  if (profiles_to_add > 0) list->AddBlock(NULL, profiles_to_add);
   return list;
 }
 
 
 List<CpuProfile*>* CpuProfilesCollection::Profiles(int security_token_id) {
   List<CpuProfile*>* unabridged_list =
       profiles_by_token_[TokenToIndex(CodeEntry::kNoSecurityToken)];
   if (security_token_id == CodeEntry::kNoSecurityToken) {
     return unabridged_list;
   }
@@ skipping 207 matching lines @@
       *entry++ = EntryForVMState(sample.state);
     }
   }
 
   profiles_->AddPathToCurrentProfiles(entries);
 }
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_LOGGING_AND_PROFILING