ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_
   6 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_
   7
   8 #include <set>
   9 #include <map>
  10 #include <vector>
  11
  12 #include "native_client/src/include/nacl_macros.h"
  13 #include "native_client/src/include/nacl_string.h"
  14 #include "native_client/src/shared/platform/nacl_sync_raii.h"
  15 #include "native_client/src/shared/srpc/nacl_srpc.h"
  16 #include "native_client/src/trusted/desc/nacl_desc_wrapper.h"
  17
  18 #include "ppapi/cpp/completion_callback.h"
  19
  20 #include "ppapi/native_client/src/trusted/plugin/nacl_subprocess.h"
  21 #include "ppapi/native_client/src/trusted/plugin/plugin_error.h"
  22 #include "ppapi/native_client/src/trusted/plugin/pnacl_resources.h"
  23
  24 #include "ppapi/utility/completion_callback_factory.h"
  25
  26 struct PP_PNaClOptions;
  27
  28 namespace plugin {
  29
  30 class Plugin;
  31 class PnaclCoordinator;
  32 class PnaclTranslateThread;
  33 class TempFile;
  34
  35 // A class invoked by Plugin to handle PNaCl client-side translation.
  36 // Usage:
  37 // (1) Invoke the factory method, e.g.,
  38 //     PnaclCoordinator* coord = BitcodeToNative(plugin,
  39 //                                               "http://foo.com/my.pexe",
  40 //                                               pnacl_options,
  41 //                                               TranslateNotifyCallback);
  42 // (2) TranslateNotifyCallback gets invoked when translation is complete.
  43 //     If the translation was successful, the pp_error argument is PP_OK.
  44 //     Other values indicate errors.
  45 // (3) After finish_callback runs, get the file descriptor of the translated
  46 //     nexe, e.g.,
  47 //     fd = coord->ReleaseTranslatedFD();
  48 // (4) Load the nexe from "fd".
  49 // (5) delete coord.
  50 //
  51 // Translation proceeds in two steps:
  52 // (1) llc translates the bitcode in pexe_url_ to an object in obj_file_.
  53 // (2) ld links the object code in obj_file_ and produces a nexe in nexe_file_.
  54 class PnaclCoordinator {
  55  public:
  56   // Maximum number of object files passable to the translator. Cannot be
  57   // changed without changing the RPC signatures.
  58   const static size_t kMaxTranslatorObjectFiles = 16;
  59   virtual ~PnaclCoordinator();
  60
  61   // The factory method for translations.
  62   static PnaclCoordinator* BitcodeToNative(
  63       Plugin* plugin,
  64       const nacl::string& pexe_url,
  65       const PP_PNaClOptions& pnacl_options,
  66       const pp::CompletionCallback& translate_notify_callback);
  67
  68   // Call this to take ownership of the FD of the translated nexe after
  69   // BitcodeToNative has completed (and the finish_callback called).
  70   PP_FileHandle TakeTranslatedFileHandle();
  71
  72   // Return a callback that should be notified when |bytes_compiled| bytes
  73   // have been compiled.
  74   pp::CompletionCallback GetCompileProgressCallback(int64_t bytes_compiled);
  75
  76   // Get the last known load progress.
  77   void GetCurrentProgress(int64_t* bytes_loaded, int64_t* bytes_total);
  78
  79   // Return true if we should delay the progress event reporting.
  80   // This delay approximates:
  81   // - the size of the buffer of bytes sent but not-yet-compiled by LLC.
  82   // - the linking time.
  83   bool ShouldDelayProgressEvent() {
  84     const uint32_t kProgressEventSlopPct = 5;
  85     return ((expected_pexe_size_ - pexe_bytes_compiled_) * 100 /
  86             expected_pexe_size_) < kProgressEventSlopPct;
  87   }
  88
  89
  90   void BitcodeStreamCacheHit(PP_FileHandle handle);
  91   void BitcodeStreamCacheMiss(int64_t expected_pexe_size);
  92
  93   // Invoked when a pexe data chunk arrives (when using streaming translation)
  94   void BitcodeStreamGotData(const void* data, int32_t length);
  95
  96   // Invoked when the pexe download finishes (using streaming translation)
  97   void BitcodeStreamDidFinish(int32_t pp_error);
  98
  99  private:
 100   NACL_DISALLOW_COPY_AND_ASSIGN(PnaclCoordinator);
 101
 102   // BitcodeToNative is the factory method for PnaclCoordinators.
 103   // Therefore the constructor is private.
 104   PnaclCoordinator(Plugin* plugin,
 105                    const nacl::string& pexe_url,
 106                    const PP_PNaClOptions& pnacl_options,
 107                    const pp::CompletionCallback& translate_notify_callback);
 108
 109   // Invoke to issue a GET request for bitcode.
 110   void OpenBitcodeStream();
 111
 112   // Invoked when a pexe data chunk is compiled.
 113   void BitcodeGotCompiled(int32_t pp_error, int64_t bytes_compiled);
 114   // Once llc and ld nexes have been loaded and the two temporary files have
 115   // been created, this starts the translation.  Translation starts two
 116   // subprocesses, one for llc and one for ld.
 117   void RunTranslate(int32_t pp_error);
 118
 119   // Invoked when translation is finished.
 120   void TranslateFinished(int32_t pp_error);
 121
 122   // Invoked when the read descriptor for nexe_file_ is created.
 123   void NexeReadDidOpen(int32_t pp_error);
 124
 125   // Bring control back to the plugin by invoking the
 126   // |translate_notify_callback_|.  This does not set the ErrorInfo report,
 127   // it is assumed that it was already set.
 128   void ExitWithError();
 129   // Run |translate_notify_callback_| with an error condition that is not
 130   // PPAPI specific.  Also set ErrorInfo report.
 131   void ReportNonPpapiError(PP_NaClError err, const nacl::string& message);
 132   // Run when faced with a PPAPI error condition. Bring control back to the
 133   // plugin by invoking the |translate_notify_callback_|.
 134   // Also set ErrorInfo report.
 135   void ReportPpapiError(PP_NaClError err,
 136                         int32_t pp_error, const nacl::string& message);
 137
 138
 139   // Keeps track of the pp_error upon entry to TranslateFinished,
 140   // for inspection after cleanup.
 141   int32_t translate_finish_error_;
 142
 143   // The plugin owning the nexe for which we are doing translation.
 144   Plugin* plugin_;
 145
 146   pp::CompletionCallback translate_notify_callback_;
 147   // Set to true when the translation (if applicable) is finished and the nexe
 148   // file is loaded, (or when there was an error), and the browser has been
 149   // notified via ReportTranslationFinished. If it is not set before
 150   // plugin/coordinator destruction, the destructor will call
 151   // ReportTranslationFinished.
 152   bool translation_finished_reported_;
 153   // Threadsafety is required to support file lookups.
 154   pp::CompletionCallbackFactory<PnaclCoordinator,
 155                                 pp::ThreadSafeThreadTraits> callback_factory_;
 156
 157   // An auxiliary class that manages downloaded resources (llc and ld nexes).
 158   nacl::scoped_ptr<PnaclResources> resources_;
 159
 160   // The URL for the pexe file.
 161   nacl::string pexe_url_;
 162   // Options for translation.
 163   PP_PNaClOptions pnacl_options_;
 164   // Architecture-specific attributes used for translation. These are
 165   // supplied by Chrome, not the developer, and are therefore different
 166   // from PNaCl options.
 167   nacl::string architecture_attributes_;
 168
 169   // Object file, produced by the translator and consumed by the linker.
 170   std::vector<TempFile*> obj_files_;
 171   nacl::scoped_ptr<nacl::DescWrapper> invalid_desc_wrapper_;
 172   // Number of split modules (threads) for llc
 173   int split_module_count_;
 174
 175   // Translated nexe file, produced by the linker.
 176   nacl::scoped_ptr<TempFile> temp_nexe_file_;
 177
 178   // Used to report information when errors (PPAPI or otherwise) are reported.
 179   ErrorInfo error_info_;
 180
 181   // True if an error was already reported, and translate_notify_callback_
 182   // was already run/consumed.
 183   bool error_already_reported_;
 184
 185   // State for timing and size information for UMA stats.
 186   int64_t pexe_size_;  // Count as we stream -- will converge to pexe size.
 187   int64_t pexe_bytes_compiled_;  // Count as we compile.
 188   int64_t expected_pexe_size_;   // Expected download total (-1 if unknown).
 189
 190   // The helper thread used to do translations via SRPC.
 191   // It accesses fields of PnaclCoordinator so it must have a
 192   // shorter lifetime.
 193   nacl::scoped_ptr<PnaclTranslateThread> translate_thread_;
 194 };
 195
 196 //----------------------------------------------------------------------
 197
 198 }  // namespace plugin;
 199 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_