Unbox phis that were proven to be of type Double.

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/class_table.h"
@@ skipping 13 matching lines @@
 class HandleVisitor;
 class Heap;
 class ICData;
 class LongJump;
 class MessageHandler;
 class Mutex;
 class ObjectPointerVisitor;
 class ObjectStore;
 class RawArray;
 class RawContext;
+class RawDouble;
 class RawError;
 class StackResource;
 class StubCode;
 class Zone;
 
+
+// Used by the deoptimization infrastructure to defer allocation of Double
+// objects until frame is fully rewritten and GC is safe.
+// See callers of Isolate::DeferDoubleMaterialization.
+class DeferredDouble {
+ public:
+  DeferredDouble(double value, RawDouble** slot, DeferredDouble* next)
+      : value_(value), slot_(slot), next_(next) { }
+
+  double value() const { return value_; }
+  RawDouble** slot() const { return slot_; }
+  DeferredDouble* next() const { return next_; }
+
+ private:
+  const double value_;
+  RawDouble** const slot_;
+  DeferredDouble* const next_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeferredDouble);
+};
+
+
 class Isolate : public BaseIsolate {
  public:
   ~Isolate();
 
   static inline Isolate* Current() {
     return reinterpret_cast<Isolate*>(Thread::GetThreadLocal(isolate_key));
   }
 
   static void SetCurrent(Isolate* isolate);
 
@@ skipping 164 matching lines @@
     return interrupt_callback_;
   }
 
   static void SetShutdownCallback(Dart_IsolateShutdownCallback cb) {
     shutdown_callback_ = cb;
   }
   static Dart_IsolateShutdownCallback ShutdownCallback() {
     return shutdown_callback_;
   }
 
-  intptr_t* deopt_registers_copy() const { return deopt_registers_copy_; }
-  void set_deopt_registers_copy(intptr_t* value) {
-    ASSERT((value == NULL) || (deopt_registers_copy_ == NULL));
-    deopt_registers_copy_ = value;
+  intptr_t* deopt_cpu_registers_copy() const {
+    return deopt_cpu_registers_copy_;
+  }
+  void set_deopt_cpu_registers_copy(intptr_t* value) {
+    ASSERT((value == NULL) || (deopt_cpu_registers_copy_ == NULL));
+    deopt_cpu_registers_copy_ = value;
+  }
+  double* deopt_xmm_registers_copy() const {
+    return deopt_xmm_registers_copy_;
+  }
+  void set_deopt_xmm_registers_copy(double* value) {
+    ASSERT((value == NULL) || (deopt_xmm_registers_copy_ == NULL));
+    deopt_xmm_registers_copy_ = value;
   }
   intptr_t* deopt_frame_copy() const { return deopt_frame_copy_; }
   void SetDeoptFrameCopy(intptr_t* value, intptr_t size) {
     ASSERT((value == NULL) || (size > 0));
     ASSERT((value == NULL) || (deopt_frame_copy_ == NULL));
     deopt_frame_copy_ = value;
     deopt_frame_copy_size_ = size;
   }
   intptr_t deopt_frame_copy_size() const { return deopt_frame_copy_size_; }
 
+  void DeferDoubleMaterialization(double value, RawDouble** slot) {
+    deferred_doubles_ = new DeferredDouble(
+        value, slot, deferred_doubles_);
+  }
+
+  DeferredDouble* DetachDeferredDoubles() {
+    DeferredDouble* list = deferred_doubles_;
+    deferred_doubles_ = NULL;
+    return list;
+  }
+
  private:
   Isolate();
 
   void BuildName(const char* name_prefix);
   void PrintInvokedFunctions();
 
   static uword GetSpecifiedStackSize();
 
   static const intptr_t kStackSizeBuffer = (16 * KB);
 
@@ skipping 19 matching lines @@
   intptr_t deopt_id_;
   RawArray* ic_data_array_;
   Mutex* mutex_;  // protects stack_limit_ and saved_stack_limit_.
   uword stack_limit_;
   uword saved_stack_limit_;
   MessageHandler* message_handler_;
   uword spawn_data_;
   GcPrologueCallbacks gc_prologue_callbacks_;
   GcEpilogueCallbacks gc_epilogue_callbacks_;
   // Deoptimization support.
-  intptr_t* deopt_registers_copy_;
+  intptr_t* deopt_cpu_registers_copy_;
+  double* deopt_xmm_registers_copy_;
   intptr_t* deopt_frame_copy_;
   intptr_t deopt_frame_copy_size_;
+  DeferredDouble* deferred_doubles_;
 
   static Dart_IsolateCreateCallback create_callback_;
   static Dart_IsolateInterruptCallback interrupt_callback_;
   static Dart_IsolateShutdownCallback shutdown_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(Isolate);
 };
 
 // When we need to execute code in an isolate, we use the
 // StartIsolateScope.
@@ skipping 55 matching lines @@
   Isolate* new_isolate_;
   Isolate* saved_isolate_;
   uword saved_stack_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(SwitchIsolateScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_