VM support for running Kernel binaries.

runtime/bin/gen_snapshot.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Generate a snapshot file after loading all the scripts specified on the
 // command line.
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 469 matching lines @@
 static Dart_Handle LoadSnapshotCreationScript(const char* script_name) {
   // First resolve the specified script uri with respect to the original
   // working directory.
   Dart_Handle resolved_uri = ResolveUriInWorkingDirectory(script_name);
   if (Dart_IsError(resolved_uri)) {
     return resolved_uri;
   }
   // Now load the contents of the specified uri.
   const char* resolved_uri_string = DartUtils::GetStringValue(resolved_uri);
   Dart_Handle source =  LoadUrlContents(resolved_uri_string);
+
   if (Dart_IsError(source)) {
     return source;
   }
   if (IsSnapshottingForPrecompilation()) {
     return Dart_LoadScript(resolved_uri, Dart_Null(), source, 0, 0);
   } else {
     return Dart_LoadLibrary(resolved_uri, Dart_Null(), source, 0, 0);
   }
 }
 
@@ skipping 813 matching lines @@
     CHECK_RESULT(result);
 
     // Set up the library tag handler in such a manner that it will use the
     // URL mapping specified on the command line to load the libraries.
     result = Dart_SetLibraryTagHandler(CreateSnapshotLibraryTagHandler);
     CHECK_RESULT(result);
 
     Dart_QualifiedFunctionName* entry_points =
         ParseEntryPointsManifestIfPresent();
 
+    intptr_t payload_bytes = 0;
+    const uint8_t* payload = NULL;
+    const bool is_kernel_file =
+        TryReadKernel(app_script_name, &payload, &payload_bytes);
+
+    if (is_kernel_file) {
+      Dart_Handle library = Dart_LoadKernel(payload, payload_bytes);
+      free(const_cast<uint8_t*>(payload));
+      if (Dart_IsError(library)) FATAL("Failed to load app from Kernel IR");
+    } else {
+      // Set up the library tag handler in such a manner that it will use the
+      // URL mapping specified on the command line to load the libraries.
+      result = Dart_SetLibraryTagHandler(CreateSnapshotLibraryTagHandler);
+      CHECK_RESULT(result);
+    }
+
     SetupStubNativeResolversForPrecompilation(entry_points);
 
-    // Load the specified script.
-    library = LoadSnapshotCreationScript(app_script_name);
-    VerifyLoaded(library);
+    if (!is_kernel_file) {
+      // Load the specified script.
+      library = LoadSnapshotCreationScript(app_script_name);
+      VerifyLoaded(library);
 
-    ImportNativeEntryPointLibrariesIntoRoot(entry_points);
+      ImportNativeEntryPointLibrariesIntoRoot(entry_points);
+    }
 
     // Ensure that we mark all libraries as loaded.
     result = Dart_FinalizeLoading(false);
     CHECK_RESULT(result);
 
     if (!IsSnapshottingForPrecompilation()) {
       CreateAndWriteSnapshot();
     } else {
       CreateAndWritePrecompiledSnapshot(entry_points);
     }
@@ skipping 14 matching lines @@
   EventHandler::Stop();
   return 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   return dart::bin::main(argc, argv);
 }