VM: Support bootstrapping core libraries from Kernel binaries instead of source.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index ab5d16f919665d6c44817b18ae2ff7df971d84a6..faef85162df7a347e2b7d54edcf274df1cda84f7 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -1241,12 +1241,15 @@ static char* BuildIsolateName(const char* script_uri, const char* main) {
 }
 
 
-DART_EXPORT Dart_Isolate Dart_CreateIsolate(const char* script_uri,
-                                            const char* main,
-                                            const uint8_t* snapshot,
-                                            Dart_IsolateFlags* flags,
-                                            void* callback_data,
-                                            char** error) {
+static Dart_Isolate CreateIsolate(const char* script_uri,
+                                  const char* main,
+                                  const uint8_t* snapshot_buffer,
+                                  intptr_t snapshot_length,
+                                  bool from_kernel,
+                                  Dart_IsolateFlags* flags,
+                                  void* callback_data,
+                                  char** error) {
+  ASSERT(!from_kernel || (snapshot_buffer != NULL));
   CHECK_NO_ISOLATE(Isolate::Current());
   char* isolate_name = BuildIsolateName(script_uri, main);
 
@@ -1270,11 +1273,12 @@ DART_EXPORT Dart_Isolate Dart_CreateIsolate(const char* script_uri,
     // bootstrap library files which call out to a tag handler that may create
     // Api Handles when an error is encountered.
     Dart_EnterScope();
-    const Error& error_obj =
-        Error::Handle(Z, Dart::InitializeIsolate(snapshot, callback_data));
+    const Error& error_obj = Error::Handle(
+        Z, Dart::InitializeIsolate(snapshot_buffer, snapshot_length,
+                                   from_kernel, callback_data));
     if (error_obj.IsNull()) {
 #if defined(DART_NO_SNAPSHOT) && !defined(PRODUCT)
-      if (FLAG_check_function_fingerprints) {
+      if (FLAG_check_function_fingerprints && !from_kernel) {
         Library::CheckFunctionFingerprints();
       }
 #endif  // defined(DART_NO_SNAPSHOT) && !defined(PRODUCT).
@@ -1297,6 +1301,30 @@ DART_EXPORT Dart_Isolate Dart_CreateIsolate(const char* script_uri,
 }
 
 
+DART_EXPORT Dart_Isolate Dart_CreateIsolate(const char* script_uri,
+                                            const char* main,
+                                            const uint8_t* snapshot_buffer,
+                                            Dart_IsolateFlags* flags,
+                                            void* callback_data,
+                                            char** error) {
+  return CreateIsolate(script_uri, main, snapshot_buffer, -1, false, flags,
+                       callback_data, error);
+}
+
+
+DART_EXPORT Dart_Isolate Dart_CreateIsolateFromKernel(
+    const char* script_uri,
+    const char* main,
+    const uint8_t* kernel_file,
+    intptr_t kernel_length,
+    Dart_IsolateFlags* flags,
+    void* callback_data,
+    char** error) {
+  return CreateIsolate(script_uri, main, kernel_file, kernel_length, true,
+                       flags, callback_data, error);
+}
+
+
 DART_EXPORT void Dart_ShutdownIsolate() {
   Thread* T = Thread::Current();
   Isolate* I = T->isolate();
@@ -5332,7 +5360,7 @@ DART_EXPORT Dart_Handle Dart_LoadKernel(const uint8_t* buffer,
   DARTSCOPE(Thread::Current());
   StackZone zone(T);
 
-#if defined(DART_PRECOMPILED_RUNTIME) && !defined(DART_PRECOMPILER)
+#if defined(DART_PRECOMPILED_RUNTIME)
   return Api::NewError("%s: Can't load Kernel files from precompiled runtime.",
                        CURRENT_FUNC);
 #else