[MIPS] Forbid $sp update at the end of the last bundle.

src/trusted/validator_mips/model.h

 /*
- * Copyright 2012 The Native Client Authors.  All rights reserved.
- * Use of this source code is governed by a BSD-style license that can
- * be found in the LICENSE file.
- * Copyright 2012, Google Inc.
+ * Copyright (c) 2012 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
  */
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_MIPS_MODEL_H
 #define NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_MIPS_MODEL_H
 
 /*
  * Models instructions and decode results.
  *
  * TODO(petarj): This file and the classes have been based on the same named
  * module within validator_arm folder. The code has been reduced and changed
@@ skipping 55 matching lines @@
   /*
    * Produces a RegisterList containing a single register.
    *
    * Note that this is an implicit constructor.  This is okay in this case
    * because
    *  - It converts between two types that we control,
    *  - It converts at most one step (no implicit conversions to Register),
    *  - It inlines to a single machine instruction,
    *  - The readability gain in inst_classes.cc is large.
    */
-  inline RegisterList(const Register r);
+  explicit inline RegisterList(const Register r);
 
   /*
    * Checks whether this list contains the given register.
    */
   inline bool operator[](const Register) const;
 
   // Checks whether this list contains all the registers in the operand.
   inline bool ContainsAll(RegisterList) const;
 
   // Checks whether this list contains any of the registers in the operand.
@@ skipping 54 matching lines @@
   inline uint32_t operator&(uint32_t) const;
 
  private:
   uint32_t _bits;
 };
 
 uint32_t const kInstrSize   = 4;
 uint32_t const kInstrAlign  = 0xFFFFFFFC;
 uint32_t const kBundleAlign = 0xFFFFFFF0;
 
+// Opcode for nop instruction.
+uint32_t const kNop = 0x0;
+
 }  // namespace
 
 // Definitions for our inlined functions.
 #include "native_client/src/trusted/validator_mips/model-inl.h"
 
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_MIPS_MODEL_H