Disable reg-exp compilation in background via a flag

runtime/vm/code_generator.cc

 // Copyright (c) 2013, 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/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
@@ skipping 22 matching lines @@
     " native entries.");
 DEFINE_FLAG(bool, background_compilation, false,
     "Run optimizing compilation in background");
 DEFINE_FLAG(int, max_subtype_cache_entries, 100,
     "Maximum number of subtype cache entries (number of checks cached).");
 DEFINE_FLAG(int, optimization_counter_threshold, 30000,
     "Function's usage-counter value before it is optimized, -1 means never");
 DEFINE_FLAG(int, regexp_optimization_counter_threshold, 1000,
     "RegExp's usage-counter value before it is optimized, -1 means never");
 DEFINE_FLAG(charp, optimization_filter, NULL, "Optimize only named function");
+// TODO(srdjan): Remove this flag once background compilation of regular
+// expressions is possible.
+DEFINE_FLAG(bool, regexp_opt_in_background, false,
+    "Optimize reg-exp functions in background");
 DEFINE_FLAG(int, reoptimization_counter_threshold, 4000,
     "Counter threshold before a function gets reoptimized.");
 DEFINE_FLAG(bool, stop_on_excessive_deoptimization, false,
     "Debugging: stops program if deoptimizing same function too often");
 DEFINE_FLAG(bool, trace_deoptimization, false, "Trace deoptimization");
 DEFINE_FLAG(bool, trace_deoptimization_verbose, false,
     "Trace deoptimization verbose");
 DEFINE_FLAG(bool, trace_failed_optimization_attempts, false,
     "Traces all failed optimization attempts");
 DEFINE_FLAG(bool, trace_ic, false, "Trace IC handling");
@@ skipping 1430 matching lines @@
 // This is called from function that needs to be optimized.
 // The requesting function can be already optimized (reoptimization).
 // Returns the Code object where to continue execution.
 DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
   const Function& function = Function::CheckedHandle(zone,
                                                      arguments.ArgAt(0));
   ASSERT(!function.IsNull());
   ASSERT(function.HasCode());
 
   if (CanOptimizeFunction(function, thread)) {
-    if (FLAG_background_compilation) {
+    // TODO(srdjan): Fix background compilation of regular expressions.
+    if (FLAG_background_compilation &&
+        (!function.IsIrregexpFunction() || FLAG_regexp_opt_in_background)) {
       if (FLAG_enable_inlining_annotations) {
         FATAL("Cannot enable inlining annotations and background compilation");
       }
       // Reduce the chance of triggering optimization while the function is
       // being optimized in the background. INT_MIN should ensure that it takes
       // long time to trigger optimization.
       // Note that the background compilation queue rejects duplicate entries.
       function.set_usage_counter(INT_MIN);
       BackgroundCompiler::EnsureInit(thread);
       ASSERT(isolate->background_compiler() != NULL);
@@ skipping 396 matching lines @@
   const intptr_t elm_size = old_data.ElementSizeInBytes();
   const TypedData& new_data =
       TypedData::Handle(TypedData::New(cid, new_size, Heap::kOld));
   TypedData::Copy(new_data, 0, old_data, 0, old_size * elm_size);
   typed_data_cell.SetAt(0, new_data);
   arguments.SetReturn(new_data);
 }
 
 
 }  // namespace dart