runtime/bin/dartutils.cc - sdk.git - Git at Google

 // 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::kCryptoLibURL = "dart:crypto";
 const char* DartUtils::kIOLibURL = "dart:io";
 const char* DartUtils::kIOLibPatchURL = "dart:io-patch";
 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::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;
       if (strlen(url_mapped_name) != 0) {
         return url_mapped_name;  // Found a mapping for this URL.
       }
     }
   }
   return NULL;  // Did not find a mapping for this URL.
 }


 int64_t DartUtils::GetIntegerValue(Dart_Handle value_obj) {
   ASSERT(Dart_IsInteger(value_obj));
   int64_t value = 0;
   Dart_Handle result = Dart_IntegerToInt64(value_obj, &value);
   ASSERT(!Dart_IsError(result));
   return value;
 }


 bool DartUtils::GetInt64Value(Dart_Handle value_obj, int64_t* value) {
   bool valid = Dart_IsInteger(value_obj);
   if (valid) {
     Dart_Handle result = Dart_IntegerFitsIntoInt64(value_obj, &valid);
     ASSERT(!Dart_IsError(result));
   }
   if (!valid) return false;
   Dart_Handle result = Dart_IntegerToInt64(value_obj, value);
   ASSERT(!Dart_IsError(result));
   return true;
 }


 const char* DartUtils::GetStringValue(Dart_Handle str_obj) {
   const char* cstring = NULL;
   Dart_Handle result = Dart_StringToCString(str_obj, &cstring);
   ASSERT(!Dart_IsError(result));
   return cstring;
 }


 bool DartUtils::GetBooleanValue(Dart_Handle bool_obj) {
   bool value = false;
   Dart_Handle result = Dart_BooleanValue(bool_obj, &value);
   ASSERT(!Dart_IsError(result));
   return value;
 }


 void DartUtils::SetIntegerField(Dart_Handle handle,
                                 const char* name,
                                 intptr_t val) {
   Dart_Handle result = Dart_SetField(handle,
                                      NewString(name),
                                      Dart_NewInteger(val));
   ASSERT(!Dart_IsError(result));
 }


 intptr_t DartUtils::GetIntegerField(Dart_Handle handle,
                                     const char* name) {
   Dart_Handle result = Dart_GetField(handle, NewString(name));
   ASSERT(!Dart_IsError(result));
   intptr_t value = DartUtils::GetIntegerValue(result);
   return value;
 }


 void DartUtils::SetStringField(Dart_Handle handle,
                                const char* name,
                                const char* val) {
   Dart_Handle result = Dart_SetField(handle, NewString(name), NewString(val));
   ASSERT(!Dart_IsError(result));
 }


 bool DartUtils::IsDartSchemeURL(const char* url_name) {
   static const intptr_t kDartSchemeLen = strlen(kDartScheme);
   // If the URL starts with "dart:" then it is considered as a special
   // library URL which is handled differently from other URLs.
   return (strncmp(url_name, kDartScheme, kDartSchemeLen) == 0);
 }


 bool DartUtils::IsDartExtensionSchemeURL(const char* url_name) {
   static const intptr_t kDartExtensionSchemeLen = strlen(kDartExtensionScheme);
   // If the URL starts with "dartext:" then it is considered as a special
   // extension library URL which is handled differently from other URLs.
   return
       (strncmp(url_name, kDartExtensionScheme, kDartExtensionSchemeLen) == 0);
 }


 bool DartUtils::IsDartCryptoLibURL(const char* url_name) {
   return (strcmp(url_name, kCryptoLibURL) == 0);
 }


 bool DartUtils::IsDartIOLibURL(const char* url_name) {
   return (strcmp(url_name, kIOLibURL) == 0);
 }


 bool DartUtils::IsDartJsonLibURL(const char* url_name) {
   return (strcmp(url_name, kJsonLibURL) == 0);
 }


 bool DartUtils::IsDartUriLibURL(const char* url_name) {
   return (strcmp(url_name, kUriLibURL) == 0);
 }


 bool DartUtils::IsDartUtfLibURL(const char* url_name) {
   return (strcmp(url_name, kUtfLibURL) == 0);
 }


 Dart_Handle DartUtils::CanonicalizeURL(CommandLineOptions* url_mapping,
                                        Dart_Handle library,
                                        const char* url_str) {
   // Get the url of the including library.
   Dart_Handle library_url = Dart_LibraryUrl(library);
   if (Dart_IsError(library_url)) {
     return Dart_Error("accessing library url failed");
   }
   if (!Dart_IsString(library_url)) {
     return Dart_Error("library url is not a string");
   }
   const char* library_url_str = NULL;
   Dart_Handle result = Dart_StringToCString(library_url, &library_url_str);
   if (Dart_IsError(result)) {
     return Dart_Error("accessing library url characters failed");
   }
   if (url_mapping != NULL) {
     const char* mapped_library_url_str = MapLibraryUrl(url_mapping,
                                                        library_url_str);
     if (mapped_library_url_str != NULL) {
       library_url_str = mapped_library_url_str;
     }
   }
   // Calculate the canonical path.
   const char* canon_url_str = GetCanonicalPath(library_url_str, url_str);
   Dart_Handle canon_url = NewString(canon_url_str);
   free(const_cast<char*>(canon_url_str));

   return canon_url;
 }


 Dart_Handle DartUtils::ReadStringFromFile(const char* filename) {
   File* file = File::Open(filename, File::kRead);
   if (file == NULL) {
     const char* format = "Unable to open file: %s";
     intptr_t len = snprintf(NULL, 0, format, filename);
     // TODO(iposva): Allocate from the zone instead of leaking error string
     // here. On the other hand the binary is about the exit anyway.
     char* error_msg = reinterpret_cast<char*>(malloc(len + 1));
     snprintf(error_msg, len + 1, format, filename);
     return Dart_Error(error_msg);
   }
   intptr_t len = file->Length();
   uint8_t* text_buffer = reinterpret_cast<uint8_t*>(malloc(len));
   if (text_buffer == NULL) {
     delete file;
     return Dart_Error("Unable to allocate buffer");
   }
   if (!file->ReadFully(text_buffer, len)) {
     delete file;
     free(text_buffer);
     return Dart_Error("Unable to fully read contents");
   }
   delete file;
   Dart_Handle str = Dart_NewStringFromUTF8(text_buffer, len);
   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] = DartUtils::NewString(DartUtils::original_working_directory);
   dart_args[1] = script_uri;
   dart_args[2] = (IsWindowsHost() ? Dart_True() : Dart_False());
   return Dart_Invoke(builtin_lib,
                      DartUtils::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,
       DartUtils::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_IsString(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::LoadAndCheckLibrary(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, 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 {
       return Dart_Error("Do not know how to load '%s'", url_string);
     }
     return Builtin::LoadAndCheckLibrary(id);
   } else {
     // Get the file path out of the url.
     Dart_Handle builtin_lib =
         Builtin::LoadAndCheckLibrary(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,
                                   Dart_Handle builtin_lib) {
   Dart_Handle resolved_script_uri;
   resolved_script_uri = ResolveScriptUri(NewString(script_uri), builtin_lib);
   if (Dart_IsError(resolved_script_uri)) {
     return resolved_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);
     }
     // We have a URL mapping specified, just read the file that the
     // URL mapping specifies and load it.
     url_string = mapped_url_string;
   }
   // The tag is either an import or a source tag.
   // Read the file and load it according to the specified tag.
   Dart_Handle source = DartUtils::ReadStringFromFile(url_string);
   if (Dart_IsError(source)) {
     return source;  // source contains the error string.
   }
   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, NewString("_getPrintClosure"), 0, 0);
   Dart_Handle corelib = Dart_LookupLibrary(NewString("dart:core"));
   Dart_Handle result = Dart_SetField(corelib,
                                      NewString("_printClosure"),
                                      print);

   // Setup the 'timer' factory.
   Dart_Handle url = NewString(kIsolateLibURL);
   DART_CHECK_VALID(url);
   Dart_Handle isolate_lib = Dart_LookupLibrary(url);
   DART_CHECK_VALID(isolate_lib);
   Dart_Handle io_lib = Builtin::LoadAndCheckLibrary(Builtin::kIOLibrary);
   Dart_Handle timer_closure =
       Dart_Invoke(io_lib, NewString("_getTimerFactoryClosure"), 0, NULL);
   Dart_Handle args[1];
   args[0] = timer_closure;
   DART_CHECK_VALID(Dart_Invoke(
       isolate_lib, NewString("_setTimerFactoryClosure"), 1, args));

   // Set up package root if specified.
   if (package_root != NULL) {
     result = 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,
                          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);
   }
   ASSERT(File::PathSeparator() != NULL && strlen(File::PathSeparator()) == 1);
   char* path_sep = strrchr(canonical_path, File::PathSeparator()[0]);
   if (path_sep == NULL) {
     // No separator found: Reference is a file in local directory.
     free(canonical_path);
     return strdup(filename);
   }
   *path_sep = '\0';
   intptr_t len = snprintf(NULL, 0, "%s%s%s",
                           canonical_path, File::PathSeparator(), filename);
   char* absolute_filename = reinterpret_cast<char*>(malloc(len + 1));
   ASSERT(absolute_filename != NULL);

   snprintf(absolute_filename, len + 1, "%s%s%s",
            canonical_path, File::PathSeparator(), filename);
   free(canonical_path);
   canonical_path = File::GetCanonicalPath(absolute_filename);
   if (canonical_path == NULL) {
     return absolute_filename;
   }
   free(absolute_filename);
   return canonical_path;
 }


 bool DartUtils::PostNull(Dart_Port port_id) {
   // Post a message with just the null object.
   return Dart_PostCObject(port_id, CObject::Null()->AsApiCObject());
 }


 bool DartUtils::PostInt32(Dart_Port port_id, int32_t value) {
   // Post a message with the integer value.
   int32_t min = 0xc0000000;  // -1073741824
   int32_t max = 0x3fffffff;  // 1073741823
   ASSERT(min <= value && value < max);
   Dart_CObject object;
   object.type = Dart_CObject::kInt32;
   object.value.as_int32 = value;
   return Dart_PostCObject(port_id, &object);
 }


 Dart_Handle DartUtils::GetDartClass(const char* library_url,
                                     const char* class_name) {
   return Dart_GetClass(Dart_LookupLibrary(NewString(library_url)),
                        NewString(class_name));
 }


 Dart_Handle DartUtils::NewDartOSError() {
   // Extract the current OS error.
   OSError os_error;
   return NewDartOSError(&os_error);
 }


 Dart_Handle DartUtils::NewDartOSError(OSError* os_error) {
   // Create a dart:io OSError object with the information retrieved from the OS.
   Dart_Handle clazz = GetDartClass(kIOLibURL, "OSError");
   Dart_Handle args[2];
   args[0] = NewString(os_error->message());
   args[1] = Dart_NewInteger(os_error->code());
   return Dart_New(clazz, Dart_Null(), 2, args);
 }


 Dart_Handle DartUtils::NewDartSocketIOException(const char* message,
                                                 Dart_Handle os_error) {
   // Create a dart:io SocketIOException object.
   Dart_Handle clazz = GetDartClass(kIOLibURL, "SocketIOException");
   Dart_Handle args[2];
   args[0] = NewString(message);
   args[1] = os_error;
   return Dart_New(clazz, Dart_Null(), 2, args);
 }


 Dart_Handle DartUtils::NewDartExceptionWithMessage(const char* library_url,
                                                    const char* exception_name,
                                                    const char* message) {
   // Create a Dart Exception object with a message.
   Dart_Handle clazz = GetDartClass(library_url, exception_name);
   Dart_Handle args[1];
   args[0] = NewString(message);
   return Dart_New(clazz, Dart_Null(), 1, args);
 }


 Dart_Handle DartUtils::NewDartArgumentError(const char* message) {
   return NewDartExceptionWithMessage(kCoreLibURL,
                                      "ArgumentError",
                                      message);
 }


 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_);


 CObject* CObject::Null() {
   return &null_;
 }


 CObject* CObject::True() {
   return &true_;
 }


 CObject* CObject::False() {
   return &false_;
 }


 CObject* CObject::Bool(bool value) {
   return value ? &true_ : &false_;
 }


 Dart_CObject* CObject::New(Dart_CObject::Type type, int additional_bytes) {
   Dart_CObject* cobject = reinterpret_cast<Dart_CObject*>(
       Dart_ScopeAllocate(sizeof(Dart_CObject) + additional_bytes));
   cobject->type = type;
   return cobject;
 }


 Dart_CObject* CObject::NewInt32(int32_t value) {
   Dart_CObject* cobject = New(Dart_CObject::kInt32);
   cobject->value.as_int32 = value;
   return cobject;
 }


 Dart_CObject* CObject::NewInt64(int64_t value) {
   Dart_CObject* cobject = New(Dart_CObject::kInt64);
   cobject->value.as_int64 = value;
   return cobject;
 }


 Dart_CObject* CObject::NewIntptr(intptr_t value) {
   // Pointer values passed as intptr_t are always send as int64_t.
   Dart_CObject* cobject = New(Dart_CObject::kInt64);
   cobject->value.as_int64 = value;
   return cobject;
 }


 Dart_CObject* CObject::NewDouble(double value) {
   Dart_CObject* cobject = New(Dart_CObject::kDouble);
   cobject->value.as_double = value;
   return cobject;
 }


 Dart_CObject* CObject::NewString(int length) {
   Dart_CObject* cobject = New(Dart_CObject::kString, length + 1);
   cobject->value.as_string = reinterpret_cast<char*>(cobject + 1);
   return cobject;
 }


 Dart_CObject* CObject::NewString(const char* str) {
   int length = strlen(str);
   Dart_CObject* cobject = NewString(length);
   memmove(cobject->value.as_string, str, length + 1);
   return cobject;
 }


 Dart_CObject* CObject::NewArray(int length) {
   Dart_CObject* cobject =
       New(Dart_CObject::kArray, length * sizeof(Dart_CObject*));  // NOLINT
   cobject->value.as_array.length = length;
   cobject->value.as_array.values =
       reinterpret_cast<Dart_CObject**>(cobject + 1);
   return cobject;
 }


 Dart_CObject* CObject::NewUint8Array(int length) {
   Dart_CObject* cobject = New(Dart_CObject::kUint8Array, length);
   cobject->value.as_byte_array.length = length;
   cobject->value.as_byte_array.values = reinterpret_cast<uint8_t*>(cobject + 1);
   return cobject;
 }


 Dart_CObject* CObject::NewExternalUint8Array(int length,
                                              uint8_t* data,
                                              void* peer,
                                              Dart_PeerFinalizer callback) {
   Dart_CObject* cobject = New(Dart_CObject::kExternalUint8Array);
   cobject->value.as_external_byte_array.length = length;
   cobject->value.as_external_byte_array.data = data;
   cobject->value.as_external_byte_array.peer = peer;
   cobject->value.as_external_byte_array.callback = callback;
   return cobject;
 }


 static int kArgumentError = 1;
 static int kOSError = 2;
 static int kFileClosedError = 3;


 CObject* CObject::IllegalArgumentError() {
   CObjectArray* result = new CObjectArray(CObject::NewArray(1));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kArgumentError)));
   return result;
 }


 CObject* CObject::FileClosedError() {
   CObjectArray* result = new CObjectArray(CObject::NewArray(1));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kFileClosedError)));
   return result;
 }


 CObject* CObject::NewOSError() {
   OSError os_error;
   return NewOSError(&os_error);
 }

 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;
 }
	// 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::kCryptoLibURL = "dart:crypto";
	const char* DartUtils::kIOLibURL = "dart:io";
	const char* DartUtils::kIOLibPatchURL = "dart:io-patch";
	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::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;
	if (strlen(url_mapped_name) != 0) {
	return url_mapped_name; // Found a mapping for this URL.
	}
	}
	}
	return NULL; // Did not find a mapping for this URL.
	}


	int64_t DartUtils::GetIntegerValue(Dart_Handle value_obj) {
	ASSERT(Dart_IsInteger(value_obj));
	int64_t value = 0;
	Dart_Handle result = Dart_IntegerToInt64(value_obj, &value);
	ASSERT(!Dart_IsError(result));
	return value;
	}


	bool DartUtils::GetInt64Value(Dart_Handle value_obj, int64_t* value) {
	bool valid = Dart_IsInteger(value_obj);
	if (valid) {
	Dart_Handle result = Dart_IntegerFitsIntoInt64(value_obj, &valid);
	ASSERT(!Dart_IsError(result));
	}
	if (!valid) return false;
	Dart_Handle result = Dart_IntegerToInt64(value_obj, value);
	ASSERT(!Dart_IsError(result));
	return true;
	}


	const char* DartUtils::GetStringValue(Dart_Handle str_obj) {
	const char* cstring = NULL;
	Dart_Handle result = Dart_StringToCString(str_obj, &cstring);
	ASSERT(!Dart_IsError(result));
	return cstring;
	}


	bool DartUtils::GetBooleanValue(Dart_Handle bool_obj) {
	bool value = false;
	Dart_Handle result = Dart_BooleanValue(bool_obj, &value);
	ASSERT(!Dart_IsError(result));
	return value;
	}


	void DartUtils::SetIntegerField(Dart_Handle handle,
	const char* name,
	intptr_t val) {
	Dart_Handle result = Dart_SetField(handle,
	NewString(name),
	Dart_NewInteger(val));
	ASSERT(!Dart_IsError(result));
	}


	intptr_t DartUtils::GetIntegerField(Dart_Handle handle,
	const char* name) {
	Dart_Handle result = Dart_GetField(handle, NewString(name));
	ASSERT(!Dart_IsError(result));
	intptr_t value = DartUtils::GetIntegerValue(result);
	return value;
	}


	void DartUtils::SetStringField(Dart_Handle handle,
	const char* name,
	const char* val) {
	Dart_Handle result = Dart_SetField(handle, NewString(name), NewString(val));
	ASSERT(!Dart_IsError(result));
	}


	bool DartUtils::IsDartSchemeURL(const char* url_name) {
	static const intptr_t kDartSchemeLen = strlen(kDartScheme);
	// If the URL starts with "dart:" then it is considered as a special
	// library URL which is handled differently from other URLs.
	return (strncmp(url_name, kDartScheme, kDartSchemeLen) == 0);
	}


	bool DartUtils::IsDartExtensionSchemeURL(const char* url_name) {
	static const intptr_t kDartExtensionSchemeLen = strlen(kDartExtensionScheme);
	// If the URL starts with "dartext:" then it is considered as a special
	// extension library URL which is handled differently from other URLs.
	return
	(strncmp(url_name, kDartExtensionScheme, kDartExtensionSchemeLen) == 0);
	}


	bool DartUtils::IsDartCryptoLibURL(const char* url_name) {
	return (strcmp(url_name, kCryptoLibURL) == 0);
	}


	bool DartUtils::IsDartIOLibURL(const char* url_name) {
	return (strcmp(url_name, kIOLibURL) == 0);
	}


	bool DartUtils::IsDartJsonLibURL(const char* url_name) {
	return (strcmp(url_name, kJsonLibURL) == 0);
	}


	bool DartUtils::IsDartUriLibURL(const char* url_name) {
	return (strcmp(url_name, kUriLibURL) == 0);
	}


	bool DartUtils::IsDartUtfLibURL(const char* url_name) {
	return (strcmp(url_name, kUtfLibURL) == 0);
	}


	Dart_Handle DartUtils::CanonicalizeURL(CommandLineOptions* url_mapping,
	Dart_Handle library,
	const char* url_str) {
	// Get the url of the including library.
	Dart_Handle library_url = Dart_LibraryUrl(library);
	if (Dart_IsError(library_url)) {
	return Dart_Error("accessing library url failed");
	}
	if (!Dart_IsString(library_url)) {
	return Dart_Error("library url is not a string");
	}
	const char* library_url_str = NULL;
	Dart_Handle result = Dart_StringToCString(library_url, &library_url_str);
	if (Dart_IsError(result)) {
	return Dart_Error("accessing library url characters failed");
	}
	if (url_mapping != NULL) {
	const char* mapped_library_url_str = MapLibraryUrl(url_mapping,
	library_url_str);
	if (mapped_library_url_str != NULL) {
	library_url_str = mapped_library_url_str;
	}
	}
	// Calculate the canonical path.
	const char* canon_url_str = GetCanonicalPath(library_url_str, url_str);
	Dart_Handle canon_url = NewString(canon_url_str);
	free(const_cast<char*>(canon_url_str));

	return canon_url;
	}


	Dart_Handle DartUtils::ReadStringFromFile(const char* filename) {
	File* file = File::Open(filename, File::kRead);
	if (file == NULL) {
	const char* format = "Unable to open file: %s";
	intptr_t len = snprintf(NULL, 0, format, filename);
	// TODO(iposva): Allocate from the zone instead of leaking error string
	// here. On the other hand the binary is about the exit anyway.
	char* error_msg = reinterpret_cast<char*>(malloc(len + 1));
	snprintf(error_msg, len + 1, format, filename);
	return Dart_Error(error_msg);
	}
	intptr_t len = file->Length();
	uint8_t* text_buffer = reinterpret_cast<uint8_t*>(malloc(len));
	if (text_buffer == NULL) {
	delete file;
	return Dart_Error("Unable to allocate buffer");
	}
	if (!file->ReadFully(text_buffer, len)) {
	delete file;
	free(text_buffer);
	return Dart_Error("Unable to fully read contents");
	}
	delete file;
	Dart_Handle str = Dart_NewStringFromUTF8(text_buffer, len);
	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] = DartUtils::NewString(DartUtils::original_working_directory);
	dart_args[1] = script_uri;
	dart_args[2] = (IsWindowsHost() ? Dart_True() : Dart_False());
	return Dart_Invoke(builtin_lib,
	DartUtils::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,
	DartUtils::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_IsString(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::LoadAndCheckLibrary(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, 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 {
	return Dart_Error("Do not know how to load '%s'", url_string);
	}
	return Builtin::LoadAndCheckLibrary(id);
	} else {
	// Get the file path out of the url.
	Dart_Handle builtin_lib =
	Builtin::LoadAndCheckLibrary(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,
	Dart_Handle builtin_lib) {
	Dart_Handle resolved_script_uri;
	resolved_script_uri = ResolveScriptUri(NewString(script_uri), builtin_lib);
	if (Dart_IsError(resolved_script_uri)) {
	return resolved_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);
	}
	// We have a URL mapping specified, just read the file that the
	// URL mapping specifies and load it.
	url_string = mapped_url_string;
	}
	// The tag is either an import or a source tag.
	// Read the file and load it according to the specified tag.
	Dart_Handle source = DartUtils::ReadStringFromFile(url_string);
	if (Dart_IsError(source)) {
	return source; // source contains the error string.
	}
	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, NewString("_getPrintClosure"), 0, 0);
	Dart_Handle corelib = Dart_LookupLibrary(NewString("dart:core"));
	Dart_Handle result = Dart_SetField(corelib,
	NewString("_printClosure"),
	print);

	// Setup the 'timer' factory.
	Dart_Handle url = NewString(kIsolateLibURL);
	DART_CHECK_VALID(url);
	Dart_Handle isolate_lib = Dart_LookupLibrary(url);
	DART_CHECK_VALID(isolate_lib);
	Dart_Handle io_lib = Builtin::LoadAndCheckLibrary(Builtin::kIOLibrary);
	Dart_Handle timer_closure =
	Dart_Invoke(io_lib, NewString("_getTimerFactoryClosure"), 0, NULL);
	Dart_Handle args[1];
	args[0] = timer_closure;
	DART_CHECK_VALID(Dart_Invoke(
	isolate_lib, NewString("_setTimerFactoryClosure"), 1, args));

	// Set up package root if specified.
	if (package_root != NULL) {
	result = 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,
	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);
	}
	ASSERT(File::PathSeparator() != NULL && strlen(File::PathSeparator()) == 1);
	char* path_sep = strrchr(canonical_path, File::PathSeparator()[0]);
	if (path_sep == NULL) {
	// No separator found: Reference is a file in local directory.
	free(canonical_path);
	return strdup(filename);
	}
	*path_sep = '\0';
	intptr_t len = snprintf(NULL, 0, "%s%s%s",
	canonical_path, File::PathSeparator(), filename);
	char* absolute_filename = reinterpret_cast<char*>(malloc(len + 1));
	ASSERT(absolute_filename != NULL);

	snprintf(absolute_filename, len + 1, "%s%s%s",
	canonical_path, File::PathSeparator(), filename);
	free(canonical_path);
	canonical_path = File::GetCanonicalPath(absolute_filename);
	if (canonical_path == NULL) {
	return absolute_filename;
	}
	free(absolute_filename);
	return canonical_path;
	}


	bool DartUtils::PostNull(Dart_Port port_id) {
	// Post a message with just the null object.
	return Dart_PostCObject(port_id, CObject::Null()->AsApiCObject());
	}


	bool DartUtils::PostInt32(Dart_Port port_id, int32_t value) {
	// Post a message with the integer value.
	int32_t min = 0xc0000000; // -1073741824
	int32_t max = 0x3fffffff; // 1073741823
	ASSERT(min <= value && value < max);
	Dart_CObject object;
	object.type = Dart_CObject::kInt32;
	object.value.as_int32 = value;
	return Dart_PostCObject(port_id, &object);
	}


	Dart_Handle DartUtils::GetDartClass(const char* library_url,
	const char* class_name) {
	return Dart_GetClass(Dart_LookupLibrary(NewString(library_url)),
	NewString(class_name));
	}


	Dart_Handle DartUtils::NewDartOSError() {
	// Extract the current OS error.
	OSError os_error;
	return NewDartOSError(&os_error);
	}


	Dart_Handle DartUtils::NewDartOSError(OSError* os_error) {
	// Create a dart:io OSError object with the information retrieved from the OS.
	Dart_Handle clazz = GetDartClass(kIOLibURL, "OSError");
	Dart_Handle args[2];
	args[0] = NewString(os_error->message());
	args[1] = Dart_NewInteger(os_error->code());
	return Dart_New(clazz, Dart_Null(), 2, args);
	}


	Dart_Handle DartUtils::NewDartSocketIOException(const char* message,
	Dart_Handle os_error) {
	// Create a dart:io SocketIOException object.
	Dart_Handle clazz = GetDartClass(kIOLibURL, "SocketIOException");
	Dart_Handle args[2];
	args[0] = NewString(message);
	args[1] = os_error;
	return Dart_New(clazz, Dart_Null(), 2, args);
	}


	Dart_Handle DartUtils::NewDartExceptionWithMessage(const char* library_url,
	const char* exception_name,
	const char* message) {
	// Create a Dart Exception object with a message.
	Dart_Handle clazz = GetDartClass(library_url, exception_name);
	Dart_Handle args[1];
	args[0] = NewString(message);
	return Dart_New(clazz, Dart_Null(), 1, args);
	}


	Dart_Handle DartUtils::NewDartArgumentError(const char* message) {
	return NewDartExceptionWithMessage(kCoreLibURL,
	"ArgumentError",
	message);
	}


	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_);


	CObject* CObject::Null() {
	return &null_;
	}


	CObject* CObject::True() {
	return &true_;
	}


	CObject* CObject::False() {
	return &false_;
	}


	CObject* CObject::Bool(bool value) {
	return value ? &true_ : &false_;
	}


	Dart_CObject* CObject::New(Dart_CObject::Type type, int additional_bytes) {
	Dart_CObject* cobject = reinterpret_cast<Dart_CObject*>(
	Dart_ScopeAllocate(sizeof(Dart_CObject) + additional_bytes));
	cobject->type = type;
	return cobject;
	}


	Dart_CObject* CObject::NewInt32(int32_t value) {
	Dart_CObject* cobject = New(Dart_CObject::kInt32);
	cobject->value.as_int32 = value;
	return cobject;
	}


	Dart_CObject* CObject::NewInt64(int64_t value) {
	Dart_CObject* cobject = New(Dart_CObject::kInt64);
	cobject->value.as_int64 = value;
	return cobject;
	}


	Dart_CObject* CObject::NewIntptr(intptr_t value) {
	// Pointer values passed as intptr_t are always send as int64_t.
	Dart_CObject* cobject = New(Dart_CObject::kInt64);
	cobject->value.as_int64 = value;
	return cobject;
	}


	Dart_CObject* CObject::NewDouble(double value) {
	Dart_CObject* cobject = New(Dart_CObject::kDouble);
	cobject->value.as_double = value;
	return cobject;
	}


	Dart_CObject* CObject::NewString(int length) {
	Dart_CObject* cobject = New(Dart_CObject::kString, length + 1);
	cobject->value.as_string = reinterpret_cast<char*>(cobject + 1);
	return cobject;
	}


	Dart_CObject* CObject::NewString(const char* str) {
	int length = strlen(str);
	Dart_CObject* cobject = NewString(length);
	memmove(cobject->value.as_string, str, length + 1);
	return cobject;
	}


	Dart_CObject* CObject::NewArray(int length) {
	Dart_CObject* cobject =
	New(Dart_CObject::kArray, length * sizeof(Dart_CObject*)); // NOLINT
	cobject->value.as_array.length = length;
	cobject->value.as_array.values =
	reinterpret_cast<Dart_CObject**>(cobject + 1);
	return cobject;
	}


	Dart_CObject* CObject::NewUint8Array(int length) {
	Dart_CObject* cobject = New(Dart_CObject::kUint8Array, length);
	cobject->value.as_byte_array.length = length;
	cobject->value.as_byte_array.values = reinterpret_cast<uint8_t*>(cobject + 1);
	return cobject;
	}


	Dart_CObject* CObject::NewExternalUint8Array(int length,
	uint8_t* data,
	void* peer,
	Dart_PeerFinalizer callback) {
	Dart_CObject* cobject = New(Dart_CObject::kExternalUint8Array);
	cobject->value.as_external_byte_array.length = length;
	cobject->value.as_external_byte_array.data = data;
	cobject->value.as_external_byte_array.peer = peer;
	cobject->value.as_external_byte_array.callback = callback;
	return cobject;
	}


	static int kArgumentError = 1;
	static int kOSError = 2;
	static int kFileClosedError = 3;


	CObject* CObject::IllegalArgumentError() {
	CObjectArray* result = new CObjectArray(CObject::NewArray(1));
	result->SetAt(0, new CObjectInt32(CObject::NewInt32(kArgumentError)));
	return result;
	}


	CObject* CObject::FileClosedError() {
	CObjectArray* result = new CObjectArray(CObject::NewArray(1));
	result->SetAt(0, new CObjectInt32(CObject::NewInt32(kFileClosedError)));
	return result;
	}


	CObject* CObject::NewOSError() {
	OSError os_error;
	return NewOSError(&os_error);
	}

	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;
	}