VM: Support bootstrapping core libraries from Kernel binaries instead of source.

runtime/vm/bootstrap_nocore.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/bootstrap.h"
 
 #include "include/dart_api.h"
 
+#include "vm/class_finalizer.h"
+#include "vm/compiler.h"
+#include "vm/kernel_reader.h"
 #include "vm/object.h"
+#include "vm/object_store.h"
 
 namespace dart {
 
+#define MAKE_PROPERTIES(CamelName, name)                                       \
+  { ObjectStore::k##CamelName, "dart:" #name },
 
-RawError* Bootstrap::DoBootstrapping() {
-  UNREACHABLE();
+
+struct BootstrapLibProps {
+  ObjectStore::BootstrapLibraryId index;
+  const char* uri;
+};
+
+
+static BootstrapLibProps bootstrap_libraries[] = {
+  FOR_EACH_BOOTSTRAP_LIBRARY(MAKE_PROPERTIES)
+};
+
+
+#undef MAKE_PROPERTIES
+
+
+static const intptr_t bootstrap_library_count = ARRAY_SIZE(bootstrap_libraries);
+
+
+void Finish(Thread* thread, bool from_kernel) {
+  Bootstrap::SetupNativeResolver();
+  ClassFinalizer::ProcessPendingClasses(from_kernel);
+
+  // Eagerly compile the _Closure class as it is the class of all closure
+  // instances. This allows us to just finalize function types without going
+  // through the hoops of trying to compile their scope class.
+  ObjectStore* object_store = thread->isolate()->object_store();
+  Class& cls = Class::Handle(thread->zone(), object_store->closure_class());
+  Compiler::CompileClass(cls);
+  // Eagerly compile Bool class, bool constants are used from within compiler.
+  cls = object_store->bool_class();
+  Compiler::CompileClass(cls);
+}
+
+
+RawError* BootstrapFromKernel(Thread* thread,
+                              const uint8_t* buffer,
+                              intptr_t buffer_length) {
+  Zone* zone = thread->zone();
+  kernel::Program* program =
+      ReadPrecompiledKernelFromBuffer(buffer, buffer_length);
+  if (program == NULL) {
+    const String& message =
+        String::Handle(zone, String::New("Failed to read Kernel file"));
+    return ApiError::New(message);
+  }
+
+  Isolate* isolate = thread->isolate();
+  // Mark the already-pending classes.  This mark bit will be used to avoid
+  // adding classes to the list more than once.
+  GrowableObjectArray& pending_classes = GrowableObjectArray::Handle(
+      zone, isolate->object_store()->pending_classes());
+  dart::Class& pending = dart::Class::Handle(zone);
+  for (intptr_t i = 0; i < pending_classes.Length(); ++i) {
+    pending ^= pending_classes.At(i);
+    pending.set_is_marked_for_parsing();
+  }
+
+  Library& library = Library::Handle(zone);
+  String& dart_name = String::Handle(zone);
+  String& kernel_name = String::Handle(zone);
+  kernel::KernelReader reader(NULL, -1, true);
+  for (intptr_t i = 0; i < bootstrap_library_count; ++i) {
+    ObjectStore::BootstrapLibraryId id = bootstrap_libraries[i].index;
+    library = isolate->object_store()->bootstrap_library(id);
+    dart_name = library.url();
+    for (intptr_t j = 0; j < program->libraries().length(); ++j) {
+      kernel::Library* kernel_library = program->libraries()[j];
+      kernel::String* uri = kernel_library->import_uri();
+      kernel_name = Symbols::FromUTF8(thread, uri->buffer(), uri->size());
+      if (kernel_name.Equals(dart_name)) {
+        reader.ReadLibrary(kernel_library);
+        library.SetLoaded();
+        break;
+      }
+    }
+  }
+
+  Finish(thread, /*from_kernel=*/true);
   return Error::null();
 }
 
 
+RawError* Bootstrap::DoBootstrapping(const uint8_t* kernel_buffer,
+                                     intptr_t kernel_buffer_length) {
+  Thread* thread = Thread::Current();
+  Isolate* isolate = thread->isolate();
+  Zone* zone = thread->zone();
+  String& uri = String::Handle(zone);
+  Library& lib = Library::Handle(zone);
+
+  HANDLESCOPE(thread);
+
+  // Ensure there are library objects for all the bootstrap libraries.
+  for (intptr_t i = 0; i < bootstrap_library_count; ++i) {
+    ObjectStore::BootstrapLibraryId id = bootstrap_libraries[i].index;
+    uri = Symbols::New(thread, bootstrap_libraries[i].uri);
+    lib = isolate->object_store()->bootstrap_library(id);
+    ASSERT(lib.raw() == Library::LookupLibrary(thread, uri));
+    if (lib.IsNull()) {
+      lib = Library::NewLibraryHelper(uri, false);
+      lib.SetLoadRequested();
+      lib.Register(thread);
+      isolate->object_store()->set_bootstrap_library(id, lib);
+    }
+  }
+
+  ASSERT(kernel_buffer != NULL);
+  return BootstrapFromKernel(thread, kernel_buffer, kernel_buffer_length);
+}
+
+
 }  // namespace dart