Added option --script-snapshot in gen_snapshot to generate the snapshot of a scipt into the file.

runtime/bin/dartutils.cc

 // 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.
 
 #include "bin/dartutils.h"
 
+#include "bin/extensions.h"
+#include "bin/directory.h"
 #include "bin/file.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/globals.h"
 
+const char* DartUtils::original_working_directory = NULL;
 const char* DartUtils::kDartScheme = "dart:";
 const char* DartUtils::kDartExtensionScheme = "dart-ext:";
 const char* DartUtils::kBuiltinLibURL = "dart:builtin";
 const char* DartUtils::kCoreLibURL = "dart:core";
 const char* DartUtils::kCoreImplLibURL = "dart:coreimpl";
 const char* DartUtils::kCryptoLibURL = "dart:crypto";
 const char* DartUtils::kIOLibURL = "dart:io";
 const char* DartUtils::kJsonLibURL = "dart:json";
 const char* DartUtils::kUriLibURL = "dart:uri";
 const char* DartUtils::kUtfLibURL = "dart:utf";
 const char* DartUtils::kIsolateLibURL = "dart:isolate";
 const char* DartUtils::kWebLibURL = "dart:web";
 
 
 const char* DartUtils::kIdFieldName = "_id";
 
 
+static bool IsWindowsHost() {
+#if defined(TARGET_OS_WINDOWS)
+  return true;
+#else  // defined(TARGET_OS_WINDOWS)
+  return false;
+#endif  // defined(TARGET_OS_WINDOWS)
+}
+
+
 static const char* MapLibraryUrl(CommandLineOptions* url_mapping,
                                  const char* url_string) {
   ASSERT(url_mapping != NULL);
   // We need to check if the passed in url is found in the url_mapping array,
   // in that case use the mapped entry.
   int len = strlen(url_string);
   for (int idx = 0; idx < url_mapping->count(); idx++) {
     const char* url_name = url_mapping->GetArgument(idx);
     if (!strncmp(url_string, url_name, len) && (url_name[len] == ',')) {
       const char* url_mapped_name = url_name + len + 1;
@@ skipping 174 matching lines @@
     return Dart_Error("Unable to fully read contents");
   }
   text_buffer[len] = '\0';
   delete file;
   Dart_Handle str = Dart_NewString(text_buffer);
   free(text_buffer);
   return str;
 }
 
 
+static Dart_Handle ResolveScriptUri(Dart_Handle script_uri,
+                                    Dart_Handle builtin_lib) {
+  const int kNumArgs = 3;
+  Dart_Handle dart_args[kNumArgs];
+  dart_args[0] = Dart_NewString(DartUtils::original_working_directory);
+  dart_args[1] = script_uri;
+  dart_args[2] = (IsWindowsHost() ? Dart_True() : Dart_False());
+  return Dart_Invoke(
+      builtin_lib, Dart_NewString("_resolveScriptUri"), kNumArgs, dart_args);
+}
+
+
+static Dart_Handle FilePathFromUri(Dart_Handle script_uri,
+                                   Dart_Handle builtin_lib) {
+  const int kNumArgs = 2;
+  Dart_Handle dart_args[kNumArgs];
+  dart_args[0] = script_uri;
+  dart_args[1] = (IsWindowsHost() ? Dart_True() : Dart_False());
+  Dart_Handle script_path = Dart_Invoke(
+      builtin_lib, Dart_NewString("_filePathFromUri"), kNumArgs, dart_args);
+  return script_path;
+}
+
+
+Dart_Handle DartUtils::LibraryTagHandler(Dart_LibraryTag tag,
+                                         Dart_Handle library,
+                                         Dart_Handle url) {
+  if (!Dart_IsLibrary(library)) {
+    return Dart_Error("not a library");
+  }
+  if (!Dart_IsString8(url)) {
+    return Dart_Error("url is not a string");
+  }
+  const char* url_string = NULL;
+  Dart_Handle result = Dart_StringToCString(url, &url_string);
+  if (Dart_IsError(result)) {
+    return result;
+  }
+  bool is_dart_scheme_url = DartUtils::IsDartSchemeURL(url_string);
+  bool is_dart_extension_url = DartUtils::IsDartExtensionSchemeURL(url_string);
+  if (tag == kCanonicalizeUrl) {
+    // If this is a Dart Scheme URL then it is not modified as it will be
+    // handled by the VM internally.
+    if (is_dart_scheme_url) {
+      return url;
+    }
+    // Resolve the url within the context of the library's URL.
+    Dart_Handle builtin_lib = Builtin::LoadLibrary(Builtin::kBuiltinLibrary);
+    Dart_Handle library_url = Dart_LibraryUrl(library);
+    if (Dart_IsError(library_url)) {
+      return library_url;
+    }
+    const int kNumArgs = 2;
+    Dart_Handle dart_args[kNumArgs];
+    dart_args[0] = library_url;
+    dart_args[1] = url;
+    return Dart_Invoke(
+        builtin_lib, Dart_NewString("_resolveUri"), kNumArgs, dart_args);
+  }
+  if (is_dart_scheme_url) {
+    ASSERT(tag == kImportTag);
+    // Handle imports of other built-in libraries present in the SDK.
+    Builtin::BuiltinLibraryId id;
+    if (DartUtils::IsDartCryptoLibURL(url_string)) {
+      id = Builtin::kCryptoLibrary;
+    } else if (DartUtils::IsDartIOLibURL(url_string)) {
+      id = Builtin::kIOLibrary;
+    } else if (DartUtils::IsDartJsonLibURL(url_string)) {
+      id = Builtin::kJsonLibrary;
+    } else if (DartUtils::IsDartUriLibURL(url_string)) {
+      id = Builtin::kUriLibrary;
+    } else if (DartUtils::IsDartUtfLibURL(url_string)) {
+      id = Builtin::kUtfLibrary;
+    } else if (DartUtils::IsDartWebLibURL(url_string)) {
+      id = Builtin::kWebLibrary;
+    } else {
+      return Dart_Error("Do not know how to load '%s'", url_string);
+    }
+    return Builtin::LoadLibrary(id);
+  } else {
+    // Get the file path out of the url.
+    Dart_Handle builtin_lib = Builtin::LoadLibrary(Builtin::kBuiltinLibrary);
+    Dart_Handle file_path = FilePathFromUri(url, builtin_lib);
+    if (Dart_IsError(file_path)) {
+      return file_path;
+    }
+    Dart_StringToCString(file_path, &url_string);
+  }
+  if (is_dart_extension_url) {
+    if (tag != kImportTag) {
+      return Dart_Error("Dart extensions must use import: '%s'", url_string);
+    }
+    return Extensions::LoadExtension(url_string, library);
+  }
+  result = DartUtils::LoadSource(NULL,
+                                 library,
+                                 url,
+                                 tag,
+                                 url_string);
+  return result;
+}
+
+
+static Dart_Handle ReadSource(Dart_Handle script_uri,
+                              Dart_Handle builtin_lib) {
+  Dart_Handle script_path = FilePathFromUri(script_uri, builtin_lib);
+  if (Dart_IsError(script_path)) {
+    return script_path;
+  }
+  const char* script_path_cstr;
+  Dart_StringToCString(script_path, &script_path_cstr);
+  Dart_Handle source = DartUtils::ReadStringFromFile(script_path_cstr);
+  return source;
+}
+
+
+Dart_Handle DartUtils::LoadScript(const char* script_uri,
+                                  bool resolve_script,
+                                  Dart_Handle builtin_lib) {
+  Dart_Handle resolved_script_uri;
+  if (resolve_script) {
+    resolved_script_uri = ResolveScriptUri(Dart_NewString(script_uri),
+                                           builtin_lib);
+    if (Dart_IsError(resolved_script_uri)) {
+      return resolved_script_uri;
+    }
+  } else {
+    resolved_script_uri = Dart_NewString(script_uri);
+  }
+  Dart_Handle source = ReadSource(resolved_script_uri, builtin_lib);
+  if (Dart_IsError(source)) {
+    return source;
+  }
+  return Dart_LoadScript(resolved_script_uri, source);
+}
+
+
 Dart_Handle DartUtils::LoadSource(CommandLineOptions* url_mapping,
                                   Dart_Handle library,
                                   Dart_Handle url,
                                   Dart_LibraryTag tag,
                                   const char* url_string) {
   if (url_mapping != NULL && IsDartSchemeURL(url_string)) {
     const char* mapped_url_string = MapLibraryUrl(url_mapping, url_string);
     if (mapped_url_string == NULL) {
       return Dart_Error("Do not know how to load %s", url_string);
     }
@@ skipping 10 matching lines @@
   if (tag == kImportTag) {
     // Return library object or an error string.
     return Dart_LoadLibrary(url, source);
   } else if (tag == kSourceTag) {
     return Dart_LoadSource(library, url, source);
   }
   return Dart_Error("wrong tag");
 }
 
 
+Dart_Handle DartUtils::PrepareForScriptLoading(const char* package_root,
+                                               Dart_Handle builtin_lib) {
+  // Setup the corelib 'print' function.
+  Dart_Handle print =
+      Dart_Invoke(builtin_lib, Dart_NewString("_getPrintClosure"), 0, 0);
+  Dart_Handle coreimpl = Dart_LookupLibrary(Dart_NewString("dart:coreimpl"));
+  Dart_Handle print_impl =
+      Dart_GetClass(coreimpl, Dart_NewString("PrintImplementation"));
+  Dart_Handle result = Dart_SetField(print_impl,
+                                     Dart_NewString("_printClosure"), print);
+
+  // Setup the IO library.
+  Dart_Handle io_lib = Builtin::LoadLibrary(Builtin::kIOLibrary);
+  Builtin::SetupIOLibrary(io_lib);
+
+  // Set up package root if specified.
+  if (package_root != NULL) {
+    result = Dart_NewString(package_root);
+    if (!Dart_IsError(result)) {
+      const int kNumArgs = 1;
+      Dart_Handle dart_args[kNumArgs];
+      dart_args[0] = result;
+      return Dart_Invoke(builtin_lib,
+                         Dart_NewString("_setPackageRoot"),
+                         kNumArgs,
+                         dart_args);
+    }
+  }
+  return result;
+}
+
+
 const char* DartUtils::GetCanonicalPath(const char* reference_dir,
                                         const char* filename) {
   if (File::IsAbsolutePath(filename)) {
     return strdup(filename);
   }
 
   char* canonical_path = File::GetCanonicalPath(reference_dir);
   if  (canonical_path == NULL) {
     canonical_path = strdup(reference_dir);
     ASSERT(canonical_path != NULL);
@@ skipping 61 matching lines @@
   Dart_Handle args[2];
   args[0] = Dart_NewString(os_error->message());
   if (Dart_IsError(args[0])) return args[0];
   args[1] = Dart_NewInteger(os_error->code());
   if (Dart_IsError(args[1])) return args[1];
   Dart_Handle err = Dart_New(clazz, Dart_Null(), 2, args);
   return err;
 }
 
 
+void DartUtils::SetOriginalWorkingDirectory() {
+  original_working_directory = Directory::Current();
+}
+
+
 // Statically allocated Dart_CObject instances for immutable
 // objects. As these will be used by different threads the use of
 // these depends on the fact that the marking internally in the
 // Dart_CObject structure is not marking simple value objects.
 Dart_CObject CObject::api_null_ = { Dart_CObject::kNull , { 0 } };
 Dart_CObject CObject::api_true_ = { Dart_CObject::kBool , { true } };
 Dart_CObject CObject::api_false_ = { Dart_CObject::kBool, { false } };
 CObject CObject::null_ = CObject(&api_null_);
 CObject CObject::true_ = CObject(&api_true_);
 CObject CObject::false_ = CObject(&api_false_);
@@ skipping 128 matching lines @@
 
 CObject* CObject::NewOSError(OSError* os_error) {
   CObject* error_message =
       new CObjectString(CObject::NewString(os_error->message()));
   CObjectArray* result = new CObjectArray(CObject::NewArray(3));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kOSError)));
   result->SetAt(1, new CObjectInt32(CObject::NewInt32(os_error->code())));
   result->SetAt(2, error_message);
   return result;
 }