Avoid using std::string in Max OS platform file.

src/platform-macos.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 34 matching lines @@
 #include <mach/semaphore.h>
 #include <mach/task.h>
 #include <mach/vm_statistics.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/types.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <errno.h>
 
-#include <string>
-
 #undef MAP_TYPE
 
 #include "v8.h"
 
 #include "platform.h"
 #include "vm-state-inl.h"
 
 // Manually define these here as weak imports, rather than including execinfo.h.
 // This lets us launch on 10.4 which does not have these calls.
 extern "C" {
@@ skipping 363 matching lines @@
 static void SetThreadName(const char* name) {
   // pthread_setname_np is only available in 10.6 or later, so test
   // for it at runtime.
   int (*dynamic_pthread_setname_np)(const char*);
   *reinterpret_cast<void**>(&dynamic_pthread_setname_np) =
     dlsym(RTLD_DEFAULT, "pthread_setname_np");
   if (!dynamic_pthread_setname_np)
     return;
 
   // Mac OS X does not expose the length limit of the name, so hardcode it.
-  const int kMaxNameLength = 63;
-  std::string shortened_name = std::string(name).substr(0, kMaxNameLength);
-  dynamic_pthread_setname_np(shortened_name.c_str());
+  static const int kMaxNameLength = 63;
+  USE(kMaxNameLength);
+  ASSERT(kMaxThreadNameLength <= kMaxNameLength); 
+  dynamic_pthread_setname_np(name);
 }
 
 
 static void* ThreadEntry(void* arg) {
   Thread* thread = reinterpret_cast<Thread*>(arg);
   // This is also initialized by the first argument to pthread_create() but we
   // don't know which thread will run first (the original thread or the new
   // one) so we initialize it here too.
   thread->thread_handle_data()->thread_ = pthread_self();
   SetThreadName(thread->name());
@@ skipping 257 matching lines @@
   Top::WakeUpRuntimeProfilerThreadBeforeShutdown();
   pthread_join(data_->sampler_thread_, NULL);
 
   // Deallocate Mach port for thread.
   mach_port_deallocate(data_->task_self_, data_->profiled_thread_);
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal