Copy ICData descriptors when starting background compilation, so that they do not change while comp…

runtime/vm/compiler_test.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 "platform/assert.h"
 #include "vm/class_finalizer.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/object.h"
 #include "vm/symbols.h"
 #include "vm/thread_pool.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
+DECLARE_FLAG(bool, background_compilation);
+
 TEST_CASE(CompileScript) {
   const char* kScriptChars =
       "class A {\n"
       "  static foo() { return 42; }\n"
       "}\n";
   String& url = String::Handle(String::New("dart-test:CompileScript"));
   String& source = String::Handle(String::New(kScriptChars));
   Script& script = Script::Handle(Script::New(url,
                                               source,
                                               RawScript::kScriptTag));
@@ skipping 61 matching lines @@
   Class& cls = Class::Handle(
       lib.LookupClass(String::Handle(Symbols::New("A"))));
   EXPECT(!cls.IsNull());
   String& function_foo_name = String::Handle(String::New("foo"));
   Function& func =
       Function::Handle(cls.LookupStaticFunction(function_foo_name));
   EXPECT(!func.HasCode());
   CompilerTest::TestCompileFunction(func);
   EXPECT(func.HasCode());
   EXPECT(!func.HasOptimizedCode());
+  FLAG_background_compilation = true;
   BackgroundCompiler::EnsureInit(thread);
   Isolate* isolate = thread->isolate();
   ASSERT(isolate->background_compiler() != NULL);
   isolate->background_compiler()->CompileOptimized(func);
   Monitor* m = new Monitor();
   MonitorLocker ml(m);
   while (!func.HasOptimizedCode()) {
     isolate->background_compiler()->InstallGeneratedCode();
     ml.Wait(1);
   }
@@ skipping 109 matching lines @@
   EXPECT(val.IsInteger());
   EXPECT_EQ(7, Integer::Cast(val).AsInt64Value());
 
   intptr_t final_class_table_size =
       Isolate::Current()->class_table()->NumCids();
   // Eval should not eat into this non-renewable resource.
   EXPECT_EQ(initial_class_table_size, final_class_table_size);
 }
 
 }  // namespace dart