Implements write barrier on MIPS.

runtime/vm/assembler_mips.h

 // 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.
 
 #ifndef VM_ASSEMBLER_MIPS_H_
 #define VM_ASSEMBLER_MIPS_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_mips.h directly; use assembler.h instead.
 #endif
@@ skipping 771 matching lines @@
   void SmiTag(Register reg) {
     sll(reg, reg, kSmiTagSize);
   }
 
   void SmiUntag(Register reg) {
     sra(reg, reg, kSmiTagSize);
   }
 
   void ReserveAlignedFrameSpace(intptr_t frame_space);
 
+  // Create a frame for calling into runtime that preserves all volatile
+  // registers.  Frame's SP is guaranteed to be correctly aligned and
+  // frame_space bytes are reserved under it.
+  void EnterCallRuntimeFrame(intptr_t frame_space);
+  void LeaveCallRuntimeFrame();
+
   void LoadWordFromPoolOffset(Register rd, int32_t offset);
   void LoadObject(Register rd, const Object& object);
   void PushObject(const Object& object);
 
   // Sets register rd to zero if the object is equal to register rn,
   // sets it to non-zero otherwise.
   void CompareObject(Register rd, Register rn, const Object& object);
 
   void LoadClassId(Register result, Register object);
   void LoadClassById(Register result, Register class_id);
   void LoadClass(Register result, Register object);
 
+  void StoreIntoObject(Register object,  // Object we are storing into.
+                       const Address& dest,  // Where we are storing into.
+                       Register value,  // Value we are storing.
+                       bool can_value_be_smi = true);
+
+  void StoreIntoObjectNoBarrier(Register object,
+                                const Address& dest,
+                                Register value);
+  void StoreIntoObjectNoBarrier(Register object,
+                                const Address& dest,
+                                const Object& value);
+
   void CallRuntime(const RuntimeEntry& entry);
 
   // Set up a Dart frame on entry with a frame pointer and PC information to
   // enable easy access to the RawInstruction object of code corresponding
   // to this frame.
   void EnterDartFrame(intptr_t frame_size);
   void LeaveDartFrame();
 
  private:
   AssemblerBuffer buffer_;
@@ skipping 135 matching lines @@
   }
 
   static int32_t EncodeBranchOffset(int32_t offset, int32_t instr);
   static int DecodeBranchOffset(int32_t instr);
 
   void EmitBranchDelayNop() {
     Emit(Instr::kNopInstruction);  // Branch delay NOP.
     delay_slot_available_ = true;
   }
 
+  void StoreIntoObjectFilter(Register object, Register value, Label* no_update);
+
+  // Shorter filtering sequence that assumes that value is not a smi.
+  void StoreIntoObjectFilterNoSmi(Register object,
+                                  Register value,
+                                  Label* no_update);
+
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_MIPS_H_