Provide metadata to validator to allow faster caching.

src/trusted/validator/validation_cache.h

 /*
  * 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_VALIDATION_CACHE_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_VALIDATION_CACHE_H_
 
+#include <stddef.h>
+
 #include "native_client/src/include/nacl_base.h"
+#include "native_client/src/include/portability.h"
 
 EXTERN_C_BEGIN
 
+struct NaClValidationMetadata;
+
 /*
  * This interface allows the validator to query a database of validation results
  * while hiding details of how the database is implemented.
  *
  * query = cache->CreateQuery(cache->handle);
  * CreateQuery: create an opaque query object, given an opaque context object.
  * The context object contains persistent variables that will be used for all
  * queries, whereas the query object contains information relevant to a single
  * validation result.
  *
@@ skipping 22 matching lines @@
 
 struct NaClValidationCache {
   void *handle;
   void *(*CreateQuery)(void *handle);
   void (*AddData)(void *query, const unsigned char *data, size_t length);
   int (*QueryKnownToValidate)(void *query);
   void (*SetKnownToValidate)(void *query);
   void (*DestroyQuery)(void *query);
 };
 
+/* Helper function for identifying the code being validated. */
+extern void AddCodeIdentity(uint8_t *data,
+                            size_t size,
+                            const struct NaClValidationMetadata *metadata,
+                            struct NaClValidationCache *cache,
+                            void *query);
+
 EXTERN_C_END
 
 #endif /* NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_VALIDATION_CACHE_H_ */