Enable mmap and identity-based validation caching on pnacl-{llc,ld}.nexe

ppapi/native_client/src/trusted/plugin/service_runtime.cc

 /*
  * Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #define NACL_LOG_MODULE_NAME "Plugin_ServiceRuntime"
 
 #include "ppapi/native_client/src/trusted/plugin/service_runtime.h"
 
@@ skipping 233 matching lines @@
             "Requires PNaCl translation -- not supported\n");
     nacl::MutexLocker take(&mu_);
     *p->op_complete_ptr = true;  // done...
     p->file_info->desc = -1;  // but failed.
     NaClXCondVarBroadcast(&cv_);
     return;
   }
 
   if (PnaclUrls::IsPnaclComponent(mapped_url)) {
     // Special PNaCl support files, that are installed on the
-    // user machine.
+    // user machine. This is usually for libraries, so they are not
+    // executable and don't interact w/ mmap'ing and validation caching.
+    uint64_t file_token_lo;
+    uint64_t file_token_hi;
     int32_t fd = PnaclResources::GetPnaclFD(
         plugin_,
-        PnaclUrls::PnaclComponentURLToFilename(mapped_url).c_str());
+        PnaclUrls::PnaclComponentURLToFilename(mapped_url).c_str(),
+        false /* is_executable */,
+        &file_token_lo,
+        &file_token_hi);
     if (fd < 0) {
       // We checked earlier if the pnacl component wasn't installed
       // yet, so this shouldn't happen. At this point, we can't do much
       // anymore, so just continue with an invalid fd.
       NaClLog(4,
               "OpenManifestEntry_MainThreadContinuation: "
               "GetReadonlyPnaclFd failed\n");
     }
     nacl::MutexLocker take(&mu_);
     *p->op_complete_ptr = true;  // done!
-    // TODO(ncbray): enable the fast loading and validation paths for this
-    // type of file.
     p->file_info->desc = fd;
     NaClXCondVarBroadcast(&cv_);
     NaClLog(4,
             "OpenManifestEntry_MainThreadContinuation: GetPnaclFd okay\n");
     return;
   }
 
   // Hereafter, normal files.
 
   // Because p is owned by the callback of this invocation, so it is necessary
@@ skipping 474 matching lines @@
 
 nacl::string ServiceRuntime::GetCrashLogOutput() {
   if (NULL != subprocess_.get()) {
     return subprocess_->GetCrashLogOutput();
   } else {
     return std::string();
   }
 }
 
 }  // namespace plugin