Implement a variation of scalar replacement for non-escaping allocations.

runtime/vm/isolate.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/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "lib/mirrors.h"
@@ skipping 293 matching lines @@
     uint32_t x = raw_uint32x4->x();
     uint32_t y = raw_uint32x4->y();
     uint32_t z = raw_uint32x4->z();
     uint32_t w = raw_uint32x4->w();
     OS::PrintErr("materializing Uint32x4 at %"Px": %x,%x,%x,%x\n",
                  reinterpret_cast<uword>(slot()), x, y, z, w);
   }
 }
 
 
+void DeferredObjectRef::Materialize() {
+  DeferredObject* obj = Isolate::Current()->GetDeferredObject(index());
+  *slot() = obj->object();
+  if (FLAG_trace_deoptimization_verbose) {
+    OS::PrintErr("writing instance ref at %"Px": %s\n",
+                 reinterpret_cast<uword>(slot()),
+                 Instance::Handle(obj->object()).ToCString());
+  }
+}
+
+
+RawInstance* DeferredObject::object() {
+  if (object_ == NULL) {
+    Materialize();
+  }
+  return object_->raw();
+}
+
+
+void DeferredObject::Materialize() {
+  Class& cls = Class::Handle();
+  cls ^= GetClass();
+
+  if (FLAG_trace_deoptimization_verbose) {
+    OS::PrintErr("materializing instance of %s (%"Px", %"Pd" fields)\n",
+                 cls.ToCString(),
+                 reinterpret_cast<uword>(args_),
+                 field_count_);
+  }
+
+  const Instance& obj = Instance::ZoneHandle(Instance::New(cls));
+
+  Field& field = Field::Handle();
+  Object& value = Object::Handle();
+  for (intptr_t i = 0; i < field_count_; i++) {
+    field ^= GetField(i);
+    value = GetValue(i);
+    obj.SetField(field, value);
+
+    if (FLAG_trace_deoptimization_verbose) {
+      OS::PrintErr("    %s <- %s\n",
+                   String::Handle(field.name()).ToCString(),
+                   value.ToCString());
+    }
+  }
+
+  object_ = &obj;
+}
+
+
 Isolate::Isolate()
     : store_buffer_(),
       message_notify_callback_(NULL),
       name_(NULL),
       start_time_(OS::GetCurrentTimeMicros()),
       main_port_(0),
       heap_(NULL),
       object_store_(NULL),
       top_context_(Context::null()),
       top_exit_frame_info_(0),
@@ skipping 13 matching lines @@
       message_handler_(NULL),
       spawn_data_(0),
       is_runnable_(false),
       running_state_(kIsolateWaiting),
       gc_prologue_callbacks_(),
       gc_epilogue_callbacks_(),
       deopt_cpu_registers_copy_(NULL),
       deopt_fpu_registers_copy_(NULL),
       deopt_frame_copy_(NULL),
       deopt_frame_copy_size_(0),
+      deferred_boxes_(NULL),
+      deferred_object_refs_(NULL),
+      deferred_objects_count_(0),
       deferred_objects_(NULL),
       stacktrace_(NULL),
       stack_frame_index_(-1) {
 }
 
 
 Isolate::~Isolate() {
   delete [] name_;
   delete heap_;
   delete object_store_;
@@ skipping 630 matching lines @@
       return isolate->GetStatusStackFrame(frame_index);
     }
   }
 
   // TODO(tball): "/isolate/<handle>/stacktrace/<frame-index>"/disassemble"
 
   return NULL;  // Unimplemented query.
 }
 
 
+static void FillDeferredSlots(DeferredSlot** slot_list) {
+  DeferredSlot* slot = *slot_list;
+  *slot_list = NULL;
+
+  while (slot != NULL) {
+    DeferredSlot* current = slot;
+    slot = slot->next();
+
+    current->Materialize();
+
+    delete current;
+  }
+}
+
+
+void Isolate::MaterializeDeferredBoxes() {
+  FillDeferredSlots(&deferred_boxes_);
+}
+
+
+void Isolate::MaterializeDeferredObjects() {
+  FillDeferredSlots(&deferred_object_refs_);
+}
+
+
 static char* GetRootScriptUri(Isolate* isolate) {
   const Library& library =
       Library::Handle(isolate->object_store()->root_library());
   ASSERT(!library.IsNull());
   const String& script_name = String::Handle(library.url());
   return isolate->current_zone()->MakeCopyOfString(script_name.ToCString());
 }
 
 
 IsolateSpawnState::IsolateSpawnState(const Function& func,
@@ skipping 70 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(isolate());
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart