[MIPS] Adding validator for MIPS architecture.

src/trusted/validator_mips/decode.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.
+ */
+
+#ifndef NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_MIPS_DECODE_H
+#define NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_MIPS_DECODE_H
+
+#include "native_client/src/trusted/validator_mips/model.h"
+#include "native_client/src/trusted/validator_mips/inst_classes.h"
+
+namespace nacl_mips_dec {
+
+struct DecoderState;
+
+/*
+ * Creates a new DecodeState instance that can be used to make calls to
+ * decode.  The caller owns the result and should delete it when appropriate,
+ * by using delete_state below.
+ */
+const DecoderState *init_decode();
+
+/*
+ * Frees any resources previously allocated by a call to init_decode.
+ */
+void delete_state(const DecoderState *);
+
+/*
+ * Chooses a ClassDecoder that can answer questions about the given Instruction.
+ */
+const ClassDecoder &decode(const Instruction, const DecoderState *);
+
+
+}  // namespace
+
+#endif  // NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_MIPS_DECODE_H