VM support for running Kernel binaries.

runtime/bin/dartutils.h

 // Copyright (c) 2012, 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.
 
 #ifndef BIN_DARTUTILS_H_
 #define BIN_DARTUTILS_H_
 
 #include "bin/isolate_data.h"
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
@@ skipping 15 matching lines @@
  * functions can also be nested without this error check, since all
  * API functions return any error handles passed in as arguments, unchanged.
  */
 static inline Dart_Handle ThrowIfError(Dart_Handle handle) {
   if (Dart_IsError(handle)) {
     Dart_PropagateError(handle);
   }
   return handle;
 }
 
+// Tries to read [script_uri] as a Kernel IR file.  If successful this function
+// returns `true` and sets [kernel_file] and [kernel_length] to be the memory
+// contents.
+//
+// The caller is responsible for free()ing [kernel_file] if `true` was returned.
+bool TryReadKernel(const char* script_uri,
+                   const uint8_t** kernel_file,
+                   intptr_t* kernel_length);
+
 class CommandLineOptions {
  public:
   explicit CommandLineOptions(int max_count)
       : count_(0), max_count_(max_count), arguments_(NULL) {
     static const int kWordSize = sizeof(intptr_t);
     arguments_ = reinterpret_cast<const char **>(malloc(max_count * kWordSize));
     if (arguments_ == NULL) {
       max_count_ = 0;
     }
   }
@@ skipping 147 matching lines @@
   }
 
   static bool SetOriginalWorkingDirectory();
   static Dart_Handle GetCanonicalizableWorkingDirectory();
 
   static const char* MapLibraryUrl(const char* url_string);
 
   static Dart_Handle ResolveUriInWorkingDirectory(Dart_Handle script_uri);
   static Dart_Handle ResolveScript(Dart_Handle url);
 
+  enum MagicNumber {
+    kSnapshotMagicNumber,
+    kKernelMagicNumber,
+    kUnknownMagicNumber
+  };
+
+  // static const uint8_t* GetMagicNumber(MagicNumber number);
+
   // Sniffs the specified text_buffer to see if it contains the magic number
   // representing a script snapshot. If the text_buffer is a script snapshot
   // the return value is an updated pointer to the text_buffer pointing past
   // the magic number value. The 'buffer_len' parameter is also appropriately
   // adjusted.
-  static const uint8_t* SniffForMagicNumber(const uint8_t* text_buffer,
-                                            intptr_t* buffer_len,
-                                            bool* is_snapshot);
+  static MagicNumber SniffForMagicNumber(const uint8_t** text_buffer,
+                                         intptr_t* buffer_len);
 
   // Write a magic number to indicate a script snapshot file.
   static void WriteMagicNumber(File* file);
 
   // Global state that stores the original working directory..
   static const char* original_working_directory;
 
   // Global state that captures the URL mappings specified on the command line.
   static CommandLineOptions* url_mapping;
 
   static const char* const kDartScheme;
   static const char* const kDartExtensionScheme;
   static const char* const kAsyncLibURL;
   static const char* const kBuiltinLibURL;
   static const char* const kCoreLibURL;
   static const char* const kInternalLibURL;
   static const char* const kIsolateLibURL;
   static const char* const kIOLibURL;
   static const char* const kIOLibPatchURL;
   static const char* const kUriLibURL;
   static const char* const kHttpScheme;
   static const char* const kVMServiceLibURL;
 
-  static const uint8_t magic_number[];
-
   static Dart_Handle LibraryFilePath(Dart_Handle library_uri);
 
  private:
   static Dart_Handle SetWorkingDirectory();
   static Dart_Handle PrepareBuiltinLibrary(Dart_Handle builtin_lib,
                                            Dart_Handle internal_lib,
                                            bool is_service_isolate,
                                            bool trace_loading);
   static Dart_Handle PrepareCoreLibrary(Dart_Handle core_lib,
                                  Dart_Handle builtin_lib,
@@ skipping 420 matching lines @@
   bool is_typed_data_;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(ScopedMemBuffer);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_DARTUTILS_H_