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

components/nacl/browser/nacl_file_host.cc

Index: components/nacl/browser/nacl_file_host.cc
diff --git a/components/nacl/browser/nacl_file_host.cc b/components/nacl/browser/nacl_file_host.cc
index 2744b8e948bc6ea86d2bfc1d2e6e60c14e02fe0e..6fb1ce6b745822b2f9291e7f0a0f57fd5976a6aa 100644
--- a/components/nacl/browser/nacl_file_host.cc
+++ b/components/nacl/browser/nacl_file_host.cc
@@ -38,14 +38,59 @@ void NotifyRendererOfError(
   nacl_host_message_filter->Send(reply_msg);
 }
 
-base::File PnaclDoOpenFile(const base::FilePath& file_to_open) {
-  return base::File(file_to_open,
-                    base::File::FLAG_OPEN | base::File::FLAG_READ);
+// Make a wrapper function for the NaClHostMsg_GetReadonlyPnaclFD macro,
+// so that there is a function pointer.
+void WriteGetReadonlyPnaclFDReply(IPC::Message* reply_msg,
+                                  IPC::PlatformFileForTransit file_desc,
+                                  uint64 file_token_lo,
+                                  uint64 file_token_hi) {
+  NaClHostMsg_GetReadonlyPnaclFD::WriteReplyParams(reply_msg,
+                                                   file_desc,
+                                                   file_token_lo,
+                                                   file_token_hi);
+}
+
+// Make a wrapper function for the NaClHostMsg_OpenNaClExecutable macro,
+// so that there is a function pointer.
+void WriteOpenNaClExecutableReply(IPC::Message* reply_msg,
+                                  IPC::PlatformFileForTransit file_desc,
+                                  uint64 file_token_lo,
+                                  uint64 file_token_hi) {
+  NaClHostMsg_OpenNaClExecutable::WriteReplyParams(reply_msg,
+                                                   file_desc,
+                                                   file_token_lo,
+                                                   file_token_hi);
+}
+
+void DoRegisterOpenedNaClExecutableFile(
+    scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter,
+    base::File file,
+    base::FilePath file_path,
+    IPC::Message* reply_msg,
+    void (*WriteReplyParams)(IPC::Message* msg,
+                             IPC::PlatformFileForTransit desc,
+                             uint64 lo_token,
+                             uint64 hi_token)) {
+  // IO thread owns the NaClBrowser singleton.
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  nacl::NaClBrowser* nacl_browser = nacl::NaClBrowser::GetInstance();
+  uint64 file_token_lo = 0;
+  uint64 file_token_hi = 0;
+  nacl_browser->PutFilePath(file_path, &file_token_lo, &file_token_hi);
+
+  IPC::PlatformFileForTransit file_desc = IPC::TakeFileHandleForProcess(
+      file.Pass(),
+      nacl_host_message_filter->PeerHandle());
+
+  (*WriteReplyParams)(reply_msg, file_desc, file_token_lo, file_token_hi);
+  nacl_host_message_filter->Send(reply_msg);
 }
 
 void DoOpenPnaclFile(
     scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter,
     const std::string& filename,
+    bool is_executable,
     IPC::Message* reply_msg) {
   DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
   base::FilePath full_filepath;
@@ -64,46 +109,33 @@ void DoOpenPnaclFile(
     return;
   }
 
-  base::File file_to_open = PnaclDoOpenFile(full_filepath);
+  base::File file_to_open = nacl::OpenNaClReadExecImpl(full_filepath,
+                                                       is_executable);
   if (!file_to_open.IsValid()) {
     NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg);
     return;
   }
 
-  // Send the reply!
-  // Do any DuplicateHandle magic that is necessary first.
-  IPC::PlatformFileForTransit target_desc =
-      IPC::TakeFileHandleForProcess(file_to_open.Pass(),
-                                    nacl_host_message_filter->PeerHandle());
-  if (target_desc == IPC::InvalidPlatformFileForTransit()) {
-    NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg);
-    return;
-  }
-  NaClHostMsg_GetReadonlyPnaclFD::WriteReplyParams(
-      reply_msg, target_desc);
-  nacl_host_message_filter->Send(reply_msg);
-}
-
-void DoRegisterOpenedNaClExecutableFile(
-    scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter,
-    base::File file,
-    base::FilePath file_path,
-    IPC::Message* reply_msg) {
-  // IO thread owns the NaClBrowser singleton.
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
-  nacl::NaClBrowser* nacl_browser = nacl::NaClBrowser::GetInstance();
-  uint64 file_token_lo = 0;
-  uint64 file_token_hi = 0;
-  nacl_browser->PutFilePath(file_path, &file_token_lo, &file_token_hi);
-
-  IPC::PlatformFileForTransit file_desc = IPC::TakeFileHandleForProcess(
-      file.Pass(),
-      nacl_host_message_filter->PeerHandle());
+  // This function is running on the blocking pool, but the path needs to be
+  // registered in a structure owned by the IO thread.
+  // Not all PNaCl files are executable. Only register those that are
+  // executable in the NaCl file_path cache.
+  if (is_executable) {
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(
+            &DoRegisterOpenedNaClExecutableFile,
+            nacl_host_message_filter,
+            Passed(file_to_open.Pass()), full_filepath, reply_msg,
+            &WriteGetReadonlyPnaclFDReply));
+  } else {
+    IPC::PlatformFileForTransit file_desc = IPC::TakeFileHandleForProcess(
+        file_to_open.Pass(),
+        nacl_host_message_filter->PeerHandle());
 
-  NaClHostMsg_OpenNaClExecutable::WriteReplyParams(
-      reply_msg, file_desc, file_token_lo, file_token_hi);
-  nacl_host_message_filter->Send(reply_msg);
+    WriteGetReadonlyPnaclFDReply(reply_msg, file_desc, 0, 0);
+    nacl_host_message_filter->Send(reply_msg);
+  }
 }
 
 // Convert the file URL into a file descriptor.
@@ -122,7 +154,7 @@ void DoOpenNaClExecutableOnThreadPool(
     return;
   }
 
-  base::File file = nacl::OpenNaClExecutableImpl(file_path);
+  base::File file = nacl::OpenNaClReadExecImpl(file_path, true);
   if (file.IsValid()) {
     // This function is running on the blocking pool, but the path needs to be
     // registered in a structure owned by the IO thread.
@@ -131,7 +163,8 @@ void DoOpenNaClExecutableOnThreadPool(
         base::Bind(
             &DoRegisterOpenedNaClExecutableFile,
             nacl_host_message_filter,
-            Passed(file.Pass()), file_path, reply_msg));
+            Passed(file.Pass()), file_path, reply_msg,
+            &WriteOpenNaClExecutableReply));
   } else {
     NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg);
     return;
@@ -145,12 +178,14 @@ namespace nacl_file_host {
 void GetReadonlyPnaclFd(
     scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter,
     const std::string& filename,
+    bool is_executable,
     IPC::Message* reply_msg) {
   if (!BrowserThread::PostBlockingPoolTask(
           FROM_HERE,
           base::Bind(&DoOpenPnaclFile,
                      nacl_host_message_filter,
                      filename,
+                     is_executable,
                      reply_msg))) {
     NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg);
   }