VM: [Kernel] Split kernel API into 3 steps: ([read binary], parse-binary, bootstrap, load program)

runtime/vm/kernel_reader.h

 // Copyright (c) 2016, 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.
 
 #ifndef RUNTIME_VM_KERNEL_READER_H_
 #define RUNTIME_VM_KERNEL_READER_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 #include <map>
 
@@ skipping 36 matching lines @@
 
   void Insert(KernelType* node, VmType* object) { map_[node] = object; }
 
  private:
   typedef typename std::map<KernelType*, VmType*> MapType;
   MapType map_;
 };
 
 class KernelReader {
  public:
-  KernelReader(const uint8_t* buffer, intptr_t len)
-      : thread_(dart::Thread::Current()),
-        zone_(thread_->zone()),
-        isolate_(thread_->isolate()),
-        scripts_(Array::ZoneHandle(zone_)),
-        program_(NULL),
-        translation_helper_(this, thread_, zone_, isolate_),
-        type_translator_(&translation_helper_,
-                         &active_class_,
-                         /*finalize=*/false),
-        buffer_(buffer),
-        buffer_length_(len) {}
-
-  // Returns either pointer to a program or null.
-  Program* ReadPrecompiledProgram();
+  explicit KernelReader(Program* program);
 
   // Returns either a library or a failure object.
   dart::Object& ReadProgram();
 
   static void SetupFunctionParameters(TranslationHelper translation_helper_,
                                       DartTypeTranslator type_translator_,
                                       const dart::Class& owner,
                                       const dart::Function& function,
                                       FunctionNode* kernel_function,
                                       bool is_method,
@@ skipping 23 matching lines @@
                               Field* kernel_field);
 
   void SetupFieldAccessorFunction(const dart::Class& klass,
                                   const dart::Function& function);
 
   dart::Library& LookupLibrary(Library* library);
   dart::Class& LookupClass(Class* klass);
 
   dart::RawFunction::Kind GetFunctionType(Procedure* kernel_procedure);
 
+  Program* program_;
+
   dart::Thread* thread_;
   dart::Zone* zone_;
   dart::Isolate* isolate_;
   Array& scripts_;
-  Program* program_;
   ActiveClass active_class_;
   BuildingTranslationHelper translation_helper_;
   DartTypeTranslator type_translator_;
 
-  const uint8_t* buffer_;
-  intptr_t buffer_length_;
-
   Mapping<Library, dart::Library> libraries_;
   Mapping<Class, dart::Class> classes_;
 };
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_READER_H_