Initial design for background compilation

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 13 matching lines @@
 #include "vm/stack_frame.h"
 #include "vm/symbols.h"
 #include "vm/thread_registry.h"
 #include "vm/verifier.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, deoptimize_alot, false,
     "Deoptimizes all live frames when we are about to return to Dart code from"
     " 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");
 DEFINE_FLAG(int, reoptimization_counter_threshold, 4000,
     "Counter threshold before a function gets reoptimized.");
 DEFINE_FLAG(bool, stop_on_excessive_deoptimization, false,
@@ skipping 1398 matching lines @@
 DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
   const Function& function = Function::CheckedHandle(zone,
                                                      arguments.ArgAt(0));
   ASSERT(!function.IsNull());
   ASSERT(function.HasCode());
 
   if (CanOptimizeFunction(function, isolate)) {
     // Reset usage counter for reoptimization before calling optimizer to
     // prevent recursive triggering of function optimization.
     function.set_usage_counter(0);
+    if (FLAG_background_compilation) {
+      BackgroundCompiler::EnsureInit(isolate);
+      ASSERT(isolate->background_compiler() != NULL);
+      isolate->background_compiler()->CompileOptimized(function);
+      // Continue in the same code.
+      arguments.SetReturn(Code::Handle(isolate, function.CurrentCode()));
+      return;
+    }
     if (FLAG_trace_compiler) {
       if (function.HasOptimizedCode()) {
         THR_Print("ReCompiling function: '%s' \n",
                   function.ToFullyQualifiedCString());
       }
     }
     const Error& error = Error::Handle(
         isolate, Compiler::CompileOptimizedFunction(thread, function));
     if (!error.IsNull()) {
       Exceptions::PropagateError(error);
@@ skipping 363 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