Incremental changes from background compilation work

runtime/vm/parser.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/parser.h"
 #include "vm/flags.h"
 
 #ifndef DART_PRECOMPILED
 
 #include "lib/invocation_mirror.h"
@@ skipping 12046 matching lines @@
 
 
 bool Parser::GetCachedConstant(intptr_t token_pos, Instance* value) {
   if (isolate()->object_store()->compile_time_constants() == Array::null()) {
     return false;
   }
   ConstantPosKey key(String::Handle(Z, script_.url()), token_pos);
   ConstantsMap constants(isolate()->object_store()->compile_time_constants());
   bool is_present = false;
   *value ^= constants.GetOrNull(key, &is_present);
-  ASSERT(constants.Release().raw() ==
-      isolate()->object_store()->compile_time_constants());
+  // Mutator compiler thread may add constants while background compiler
+  // is running , and thus change the value of 'compile_time_constants';
+  // do not assert that 'compile_time_constants' has not changed.
+  constants.Release();
   if (FLAG_compiler_stats && is_present) {
     isolate_->compiler_stats()->num_const_cache_hits++;
   }
   return is_present;
 }
 
 
 RawInstance* Parser::TryCanonicalize(const Instance& instance,
                                      intptr_t token_pos) {
   if (instance.IsNull()) {
@@ skipping 2413 matching lines @@
     const ArgumentListNode& function_args,
     const LocalVariable* temp_for_last_arg,
     bool is_super_invocation) {
   UNREACHABLE();
   return NULL;
 }
 
 }  // namespace dart
 
 #endif  // DART_PRECOMPILED