Add diagnostic message if external blob files cannot be loaded.

src/startup-data-util.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/startup-data-util.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
+#include "src/utils.h"
 
 
 namespace v8 {
 namespace internal {
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 
 namespace {
 
 v8::StartupData g_natives;
@@ skipping 15 matching lines @@
 void FreeStartupData() {
   DeleteStartupData(&g_natives);
   DeleteStartupData(&g_snapshot);
 }
 
 
 void Load(const char* blob_file, v8::StartupData* startup_data,
           void (*setter_fn)(v8::StartupData*)) {
   ClearStartupData(startup_data);
 
-  if (!blob_file) return;
+  CHECK(blob_file);
 
   FILE* file = fopen(blob_file, "rb");
-  if (!file) return;
+  if (!file) {
+    PrintF(stderr, "Failed to open startup resource '%s'.\n", blob_file);
+    return;
+  }
 
   fseek(file, 0, SEEK_END);
   startup_data->raw_size = static_cast<int>(ftell(file));
   rewind(file);
 
   startup_data->data = new char[startup_data->raw_size];
   int read_size = static_cast<int>(fread(const_cast<char*>(startup_data->data),
                                          1, startup_data->raw_size, file));
   fclose(file);
 
-  if (startup_data->raw_size == read_size) (*setter_fn)(startup_data);
+  if (startup_data->raw_size == read_size) {
+    (*setter_fn)(startup_data);
+  } else {
+    PrintF(stderr, "Corrupted startup resource '%s'.\n", blob_file);
+  }
 }
 
 
 void LoadFromFiles(const char* natives_blob, const char* snapshot_blob) {
   Load(natives_blob, &g_natives, v8::V8::SetNativesDataBlob);
   Load(snapshot_blob, &g_snapshot, v8::V8::SetSnapshotDataBlob);
 
   atexit(&FreeStartupData);
 }
 
@@ skipping 36 matching lines @@
 
 void InitializeExternalStartupData(const char* natives_blob,
                                    const char* snapshot_blob) {
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   LoadFromFiles(natives_blob, snapshot_blob);
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 }
 
 }  // namespace internal
 }  // namespace v8