Add ConstThreadState to mach_extensions.h and use it everywhere

util/mach/exc_server_variants.h

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef CRASHPAD_UTIL_MACH_EXC_SERVER_VARIANTS_H_
 #define CRASHPAD_UTIL_MACH_EXC_SERVER_VARIANTS_H_
 
 #include <mach/mach.h>
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "util/mach/mach_extensions.h"
 #include "util/mach/mach_message_server.h"
 
 namespace crashpad {
 
 namespace internal {
 class UniversalMachExcServerImpl;
 }  // namespace internal
 
 //! \brief A server interface for the `exc` and `mach_exc` Mach subsystems,
 //!     unified to handle exceptions delivered to either subsystem, and
@@ skipping 42 matching lines @@
     //!     MachMessageServer::Interface.
     virtual kern_return_t CatchMachException(
         exception_behavior_t behavior,
         exception_handler_t exception_port,
         thread_t thread,
         task_t task,
         exception_type_t exception,
         const mach_exception_data_type_t* code,
         mach_msg_type_number_t code_count,
         thread_state_flavor_t* flavor,
-        const natural_t* old_state,
+        ConstThreadState old_state,
         mach_msg_type_number_t old_state_count,
         thread_state_t new_state,
         mach_msg_type_number_t* new_state_count,
         const mach_msg_trailer_t* trailer,
         bool* destroy_complex_request) = 0;
 
    protected:
     ~Interface() {}
   };
 
@@ skipping 127 matching lines @@
 //!     This parameter is untouched if \a behavior is not state-carrying.
 //! \param[inout] new_state_count On entry, the number of `natural_t` words
 //!     available to be written to in \a new_state. On return, the number of
 //!     significant `natural_t` words in \a new_state. This may be taken
 //!     directly from the \a new_state_count parameter of
 //!     internal::SimplifiedExcServer::Interface::CatchException(), for example.
 //!     This parameter is untouched if \a behavior is not state-carrying. If \a
 //!     \a behavior is state-carrying, this parameter should be at least as
 //!     large as \a old_state_count.
 void ExcServerCopyState(exception_behavior_t behavior,
-                        const natural_t* old_state,
+                        ConstThreadState old_state,
                         mach_msg_type_number_t old_state_count,
                         thread_state_t new_state,
                         mach_msg_type_number_t* new_state_count);
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_MACH_EXC_SERVER_VARIANTS_H_