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| 1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 |
| 6 #include "bin/loader.h" |
| 7 |
| 8 #include "bin/builtin.h" |
| 9 #include "bin/dartutils.h" |
| 10 #include "bin/extensions.h" |
| 11 #include "bin/lockers.h" |
| 12 |
| 13 namespace dart { |
| 14 namespace bin { |
| 15 |
| 16 // Development flag. |
| 17 static bool trace_loader = false; |
| 18 |
| 19 Loader::Loader(IsolateData* isolate_data) |
| 20 : port_(ILLEGAL_PORT), |
| 21 isolate_data_(isolate_data), |
| 22 error_(Dart_Null()), |
| 23 monitor_(NULL), |
| 24 pending_operations_(0), |
| 25 results_(NULL), |
| 26 results_length_(0), |
| 27 results_capacity_(0) { |
| 28 monitor_ = new Monitor(); |
| 29 ASSERT(isolate_data_ != NULL); |
| 30 port_ = Dart_NewNativePort("Loader", |
| 31 Loader::NativeMessageHandler, |
| 32 false); |
| 33 isolate_data_->set_loader(this); |
| 34 AddLoader(port_, isolate_data_); |
| 35 } |
| 36 |
| 37 |
| 38 Loader::~Loader() { |
| 39 ASSERT(port_ != ILLEGAL_PORT); |
| 40 RemoveLoader(port_); |
| 41 Dart_CloseNativePort(port_); |
| 42 port_ = ILLEGAL_PORT; |
| 43 isolate_data_->set_loader(NULL); |
| 44 isolate_data_ = NULL; |
| 45 delete monitor_; |
| 46 monitor_ = NULL; |
| 47 for (intptr_t i = 0; i < results_length_; i++) { |
| 48 results_[i].Cleanup(); |
| 49 } |
| 50 free(results_); |
| 51 results_ = NULL; |
| 52 } |
| 53 |
| 54 |
| 55 // Copy the contents of |message| into an |IOResult|. |
| 56 void Loader::IOResult::Setup(Dart_CObject* message) { |
| 57 ASSERT(message->type == Dart_CObject_kArray); |
| 58 ASSERT(message->value.as_array.length == 4); |
| 59 Dart_CObject* tag_message = message->value.as_array.values[0]; |
| 60 ASSERT(tag_message != NULL); |
| 61 Dart_CObject* uri_message = message->value.as_array.values[1]; |
| 62 ASSERT(uri_message != NULL); |
| 63 Dart_CObject* library_uri_message = message->value.as_array.values[2]; |
| 64 ASSERT(library_uri_message != NULL); |
| 65 Dart_CObject* payload_message = message->value.as_array.values[3]; |
| 66 ASSERT(payload_message != NULL); |
| 67 |
| 68 // Grab the tag. |
| 69 ASSERT(tag_message->type == Dart_CObject_kInt32); |
| 70 tag = tag_message->value.as_int32; |
| 71 |
| 72 // Grab the uri id. |
| 73 ASSERT(uri_message->type == Dart_CObject_kString); |
| 74 uri = strdup(uri_message->value.as_string); |
| 75 |
| 76 // Grab the library uri if one is present. |
| 77 if (library_uri_message->type != Dart_CObject_kNull) { |
| 78 ASSERT(library_uri_message->type == Dart_CObject_kString); |
| 79 library_uri = strdup(library_uri_message->value.as_string); |
| 80 } else { |
| 81 library_uri = NULL; |
| 82 } |
| 83 |
| 84 // Grab the payload. |
| 85 if (payload_message->type == Dart_CObject_kString) { |
| 86 // Payload is an error message. |
| 87 payload_length = strlen(payload_message->value.as_string); |
| 88 payload = |
| 89 reinterpret_cast<uint8_t*>(strdup(payload_message->value.as_string)); |
| 90 } else { |
| 91 // Payload is the contents of a file. |
| 92 ASSERT(payload_message->type == Dart_CObject_kTypedData); |
| 93 ASSERT(payload_message->value.as_typed_data.type == Dart_TypedData_kUint8); |
| 94 payload_length = payload_message->value.as_typed_data.length; |
| 95 payload = reinterpret_cast<uint8_t*>(malloc(payload_length)); |
| 96 memmove(payload, |
| 97 payload_message->value.as_typed_data.values, |
| 98 payload_length); |
| 99 } |
| 100 } |
| 101 |
| 102 |
| 103 void Loader::IOResult::Cleanup() { |
| 104 free(uri); |
| 105 free(library_uri); |
| 106 free(payload); |
| 107 } |
| 108 |
| 109 |
| 110 // Send the Loader Initialization message to the service isolate. This |
| 111 // message is sent the first time a loader is constructed for an isolate and |
| 112 // seeds the service isolate with some initial state about this isolate. |
| 113 void Loader::Init(const char* package_root, |
| 114 const char* packages_file, |
| 115 const char* working_directory) { |
| 116 // This port delivers loading messages to the service isolate. |
| 117 Dart_Port loader_port = Builtin::LoadPort(); |
| 118 ASSERT(loader_port != ILLEGAL_PORT); |
| 119 |
| 120 // Keep in sync with loader.dart. |
| 121 const intptr_t _Dart_kInitLoader = 4; |
| 122 |
| 123 Dart_Handle request = Dart_NewList(7); |
| 124 Dart_ListSetAt(request, 0, trace_loader ? Dart_True() : Dart_False()); |
| 125 Dart_ListSetAt(request, 1, Dart_NewInteger(Dart_GetMainPortId())); |
| 126 Dart_ListSetAt(request, 2, Dart_NewInteger(_Dart_kInitLoader)); |
| 127 Dart_ListSetAt(request, 3, Dart_NewSendPort(port_)); |
| 128 Dart_ListSetAt(request, 4, |
| 129 (package_root == NULL) ? Dart_Null() : |
| 130 Dart_NewStringFromCString(package_root)); |
| 131 Dart_ListSetAt(request, 5, |
| 132 (packages_file == NULL) ? Dart_Null() : |
| 133 Dart_NewStringFromCString(packages_file)); |
| 134 Dart_ListSetAt(request, 6, |
| 135 Dart_NewStringFromCString(working_directory)); |
| 136 |
| 137 bool success = Dart_Post(loader_port, request); |
| 138 ASSERT(success); |
| 139 } |
| 140 |
| 141 |
| 142 // Forward a request from the tag handler to the service isolate. |
| 143 void Loader::SendRequest(Dart_LibraryTag tag, |
| 144 Dart_Handle url, |
| 145 Dart_Handle library_url) { |
| 146 // This port delivers loading messages to the service isolate. |
| 147 Dart_Port loader_port = Builtin::LoadPort(); |
| 148 ASSERT(loader_port != ILLEGAL_PORT); |
| 149 |
| 150 Dart_Handle request = Dart_NewList(6); |
| 151 Dart_ListSetAt(request, 0, trace_loader ? Dart_True() : Dart_False()); |
| 152 Dart_ListSetAt(request, 1, Dart_NewInteger(Dart_GetMainPortId())); |
| 153 Dart_ListSetAt(request, 2, Dart_NewInteger(tag)); |
| 154 Dart_ListSetAt(request, 3, Dart_NewSendPort(port_)); |
| 155 |
| 156 Dart_ListSetAt(request, 4, url); |
| 157 Dart_ListSetAt(request, 5, library_url); |
| 158 |
| 159 if (Dart_Post(loader_port, request)) { |
| 160 MonitorLocker ml(monitor_); |
| 161 pending_operations_++; |
| 162 } |
| 163 } |
| 164 |
| 165 |
| 166 void Loader::QueueMessage(Dart_CObject* message) { |
| 167 MonitorLocker ml(monitor_); |
| 168 if (results_length_ == results_capacity_) { |
| 169 // Grow to an initial capacity or double in size. |
| 170 results_capacity_ = (results_capacity_ == 0) ? 4 : results_capacity_ * 2; |
| 171 results_ = |
| 172 reinterpret_cast<IOResult*>( |
| 173 realloc(results_, |
| 174 sizeof(IOResult) * results_capacity_)); |
| 175 ASSERT(results_ != NULL); |
| 176 } |
| 177 ASSERT(results_ != NULL); |
| 178 ASSERT(results_length_ < results_capacity_); |
| 179 results_[results_length_].Setup(message); |
| 180 results_length_++; |
| 181 ml.Notify(); |
| 182 } |
| 183 |
| 184 |
| 185 void Loader::BlockUntilComplete() { |
| 186 MonitorLocker ml(monitor_); |
| 187 |
| 188 while (true) { |
| 189 // If |ProcessQueueLocked| returns false, we've hit an error and should |
| 190 // stop loading. |
| 191 if (!ProcessQueueLocked()) { |
| 192 break; |
| 193 } |
| 194 |
| 195 // When |pending_operations_| hits 0, we are done loading. |
| 196 if (pending_operations_ == 0) { |
| 197 break; |
| 198 } |
| 199 |
| 200 // Wait to be notified about new I/O results. |
| 201 ml.Wait(); |
| 202 } |
| 203 } |
| 204 |
| 205 |
| 206 bool Loader::ProcessResultLocked(Loader::IOResult* result) { |
| 207 // A negative result tag indicates a loading error occurred in the service |
| 208 // isolate. The payload is a C string of the error message. |
| 209 if (result->tag < 0) { |
| 210 error_ = |
| 211 Dart_NewUnhandledExceptionError( |
| 212 Dart_NewStringFromUTF8(result->payload, |
| 213 result->payload_length)); |
| 214 |
| 215 return false; |
| 216 } |
| 217 |
| 218 // We have to copy everything we care about out of |result| because after |
| 219 // dropping the lock below |result| may no longer valid. |
| 220 Dart_Handle uri = |
| 221 Dart_NewStringFromCString(reinterpret_cast<char*>(result->uri)); |
| 222 Dart_Handle library_uri = Dart_Null(); |
| 223 if (result->library_uri != NULL) { |
| 224 library_uri = |
| 225 Dart_NewStringFromCString(reinterpret_cast<char*>(result->library_uri)); |
| 226 } |
| 227 Dart_Handle source = |
| 228 Dart_NewStringFromUTF8(result->payload, |
| 229 result->payload_length); |
| 230 intptr_t tag = result->tag; |
| 231 |
| 232 // No touching. |
| 233 result = NULL; |
| 234 |
| 235 // We must drop the lock here because the tag handler may be recursively |
| 236 // invoked and it will attempt to acquire the lock to queue more work. |
| 237 monitor_->Exit(); |
| 238 |
| 239 Dart_Handle dart_result = Dart_Null(); |
| 240 |
| 241 |
| 242 switch (tag) { |
| 243 case Dart_kImportTag: |
| 244 dart_result = Dart_LoadLibrary(uri, source, 0, 0); |
| 245 break; |
| 246 case Dart_kSourceTag: { |
| 247 ASSERT(library_uri != Dart_Null()); |
| 248 Dart_Handle library = Dart_LookupLibrary(library_uri); |
| 249 ASSERT(!Dart_IsError(library)); |
| 250 dart_result = Dart_LoadSource(library, uri, source, 0, 0); |
| 251 } |
| 252 break; |
| 253 case Dart_kScriptTag: |
| 254 dart_result = Dart_LoadScript(uri, source, 0, 0); |
| 255 break; |
| 256 default: |
| 257 UNREACHABLE(); |
| 258 } |
| 259 |
| 260 // Re-acquire the lock before exiting the function (it was held before entry), |
| 261 monitor_->Enter(); |
| 262 if (Dart_IsError(dart_result)) { |
| 263 // Remember the error if we encountered one. |
| 264 error_ = dart_result; |
| 265 return false; |
| 266 } |
| 267 |
| 268 return true; |
| 269 } |
| 270 |
| 271 |
| 272 bool Loader::ProcessQueueLocked() { |
| 273 bool hit_error = false; |
| 274 for (intptr_t i = 0; i < results_length(); i++) { |
| 275 if (!hit_error) { |
| 276 hit_error = !ProcessResultLocked(&results_[i]); |
| 277 } |
| 278 pending_operations_--; |
| 279 ASSERT(hit_error || (pending_operations_ >= 0)); |
| 280 results_[i].Cleanup(); |
| 281 } |
| 282 results_length_ = 0; |
| 283 return !hit_error; |
| 284 } |
| 285 |
| 286 |
| 287 static bool IsWindowsHost() { |
| 288 #if defined(TARGET_OS_WINDOWS) |
| 289 return true; |
| 290 #else // defined(TARGET_OS_WINDOWS) |
| 291 return false; |
| 292 #endif // defined(TARGET_OS_WINDOWS) |
| 293 } |
| 294 |
| 295 |
| 296 Dart_Handle Loader::LibraryTagHandler(Dart_LibraryTag tag, |
| 297 Dart_Handle library, |
| 298 Dart_Handle url) { |
| 299 if (tag == Dart_kCanonicalizeUrl) { |
| 300 return Dart_DefaultCanonicalizeUrl(library, url); |
| 301 } |
| 302 const char* url_string = NULL; |
| 303 Dart_Handle result = Dart_StringToCString(url, &url_string); |
| 304 if (Dart_IsError(result)) { |
| 305 return result; |
| 306 } |
| 307 |
| 308 // Special case for handling dart: imports and parts. |
| 309 if (tag != Dart_kScriptTag) { |
| 310 // Grab the library's url. |
| 311 Dart_Handle library_url = Dart_LibraryUrl(library); |
| 312 const char* library_url_string = NULL; |
| 313 result = Dart_StringToCString(library_url, &library_url_string); |
| 314 if (Dart_IsError(result)) { |
| 315 return result; |
| 316 } |
| 317 |
| 318 bool is_dart_scheme_url = DartUtils::IsDartSchemeURL(url_string); |
| 319 bool is_dart_library = DartUtils::IsDartSchemeURL(library_url_string); |
| 320 |
| 321 if (is_dart_scheme_url || is_dart_library) { |
| 322 return DartColonLibraryTagHandler(tag, |
| 323 library, |
| 324 url, |
| 325 library_url_string, |
| 326 url_string); |
| 327 } |
| 328 } |
| 329 |
| 330 if (DartUtils::IsDartExtensionSchemeURL(url_string)) { |
| 331 // Load a native code shared library to use in a native extension |
| 332 if (tag != Dart_kImportTag) { |
| 333 return DartUtils::NewError("Dart extensions must use import: '%s'", |
| 334 url_string); |
| 335 } |
| 336 Dart_Handle library_url = Dart_LibraryUrl(library); |
| 337 Dart_Handle library_file_path = DartUtils::LibraryFilePath(library_url); |
| 338 const char* lib_path_str = NULL; |
| 339 Dart_StringToCString(library_file_path, &lib_path_str); |
| 340 const char* extension_path = DartUtils::RemoveScheme(url_string); |
| 341 if (strchr(extension_path, '/') != NULL || |
| 342 (IsWindowsHost() && strchr(extension_path, '\\') != NULL)) { |
| 343 return DartUtils::NewError( |
| 344 "Relative paths for dart extensions are not supported: '%s'", |
| 345 extension_path); |
| 346 } |
| 347 return Extensions::LoadExtension(lib_path_str, |
| 348 extension_path, |
| 349 library); |
| 350 } |
| 351 |
| 352 IsolateData* isolate_data = |
| 353 reinterpret_cast<IsolateData*>(Dart_CurrentIsolateData()); |
| 354 ASSERT(isolate_data != NULL); |
| 355 |
| 356 // Grab this isolate's loader. |
| 357 Loader* loader = NULL; |
| 358 |
| 359 // The outer invocation of the tag handler for this isolate. We make the outer |
| 360 // invocation block and allow any nested invocations to operate in parallel. |
| 361 bool blocking_call = !isolate_data->HasLoader(); |
| 362 |
| 363 if (!isolate_data->HasLoader()) { |
| 364 // The isolate doesn't have a loader -- this is the outer invocation which |
| 365 // will block. |
| 366 |
| 367 // Setup the loader. The constructor does a bunch of leg work. |
| 368 loader = new Loader(isolate_data); |
| 369 loader->Init(isolate_data->package_root, |
| 370 isolate_data->packages_file, |
| 371 DartUtils::original_working_directory); |
| 372 } else { |
| 373 // The isolate has a loader -- this is an inner invocation that will queue |
| 374 // work with the service isolate. |
| 375 // Use the existing loader. |
| 376 loader = isolate_data->loader(); |
| 377 } |
| 378 ASSERT(loader != NULL); |
| 379 ASSERT(isolate_data->HasLoader()); |
| 380 |
| 381 loader->SendRequest(tag, |
| 382 url, |
| 383 (library != Dart_Null()) ? |
| 384 Dart_LibraryUrl(library) : Dart_Null()); |
| 385 |
| 386 if (blocking_call) { |
| 387 // The outer invocation of the tag handler will block here until all nested |
| 388 // invocations complete. |
| 389 loader->BlockUntilComplete(); |
| 390 |
| 391 // Remember the error (if any). |
| 392 Dart_Handle error = loader->error(); |
| 393 // Destroy the loader. The destructor does a bunch of leg work. |
| 394 delete loader; |
| 395 |
| 396 // An error occurred during loading. |
| 397 if (Dart_IsError(error)) { |
| 398 return error; |
| 399 } |
| 400 |
| 401 // Finalize loading. This will complete any futures for completed deferred |
| 402 // loads. |
| 403 error = Dart_FinalizeLoading(true); |
| 404 if (Dart_IsError(error)) { |
| 405 return error; |
| 406 } |
| 407 } |
| 408 return Dart_Null(); |
| 409 } |
| 410 |
| 411 |
| 412 Dart_Handle Loader::DartColonLibraryTagHandler(Dart_LibraryTag tag, |
| 413 Dart_Handle library, |
| 414 Dart_Handle url, |
| 415 const char* library_url_string, |
| 416 const char* url_string) { |
| 417 // Handle canonicalization, 'import' and 'part' of 'dart:' libraries. |
| 418 if (tag == Dart_kCanonicalizeUrl) { |
| 419 // These will be handled internally. |
| 420 return url; |
| 421 } else if (tag == Dart_kImportTag) { |
| 422 Builtin::BuiltinLibraryId id = Builtin::FindId(url_string); |
| 423 if (id == Builtin::kInvalidLibrary) { |
| 424 return DartUtils::NewError("The built-in library '%s' is not available" |
| 425 " on the stand-alone VM.\n", url_string); |
| 426 } |
| 427 return Builtin::LoadLibrary(url, id); |
| 428 } else { |
| 429 ASSERT(tag == Dart_kSourceTag); |
| 430 Builtin::BuiltinLibraryId id = Builtin::FindId(library_url_string); |
| 431 if (id == Builtin::kInvalidLibrary) { |
| 432 return DartUtils::NewError("The built-in library '%s' is not available" |
| 433 " on the stand-alone VM. Trying to load" |
| 434 " '%s'.\n", library_url_string, url_string); |
| 435 } |
| 436 // Prepend the library URI to form a unique script URI for the part. |
| 437 intptr_t len = snprintf(NULL, 0, "%s/%s", library_url_string, url_string); |
| 438 char* part_uri = reinterpret_cast<char*>(malloc(len + 1)); |
| 439 snprintf(part_uri, len + 1, "%s/%s", library_url_string, url_string); |
| 440 Dart_Handle part_uri_obj = DartUtils::NewString(part_uri); |
| 441 free(part_uri); |
| 442 return Dart_LoadSource(library, |
| 443 part_uri_obj, |
| 444 Builtin::PartSource(id, url_string), 0, 0); |
| 445 } |
| 446 // All cases should have been handled above. |
| 447 UNREACHABLE(); |
| 448 } |
| 449 |
| 450 |
| 451 Mutex Loader::loader_infos_lock_; |
| 452 Loader::LoaderInfo* Loader::loader_infos_ = NULL; |
| 453 intptr_t Loader::loader_infos_length_ = 0; |
| 454 intptr_t Loader::loader_infos_capacity_ = 0; |
| 455 |
| 456 |
| 457 // Add a mapping from |port| to |isolate_data| (really the loader). When a |
| 458 // native message arrives, we use this map to report the I/O result to the |
| 459 // correct loader. |
| 460 // This happens whenever an isolate begins loading. |
| 461 void Loader::AddLoader(Dart_Port port, IsolateData* isolate_data) { |
| 462 ASSERT(LoaderFor(port) == NULL); |
| 463 if (loader_infos_length_ == loader_infos_capacity_) { |
| 464 // Grow to an initial capacity or double in size. |
| 465 loader_infos_capacity_ = |
| 466 (loader_infos_capacity_ == 0) ? 4 : loader_infos_capacity_ * 2; |
| 467 loader_infos_ = |
| 468 reinterpret_cast<Loader::LoaderInfo*>( |
| 469 realloc(loader_infos_, |
| 470 sizeof(Loader::LoaderInfo) * loader_infos_capacity_)); |
| 471 ASSERT(loader_infos_ != NULL); |
| 472 // Initialize new entries. |
| 473 for (intptr_t i = loader_infos_length_; i < loader_infos_capacity_; i++) { |
| 474 loader_infos_[i].port = ILLEGAL_PORT; |
| 475 loader_infos_[i].isolate_data = NULL; |
| 476 } |
| 477 } |
| 478 ASSERT(loader_infos_length_ < loader_infos_capacity_); |
| 479 loader_infos_[loader_infos_length_].port = port; |
| 480 loader_infos_[loader_infos_length_].isolate_data = isolate_data; |
| 481 loader_infos_length_++; |
| 482 ASSERT(LoaderFor(port) != NULL); |
| 483 } |
| 484 |
| 485 |
| 486 // Remove |port| from the map. |
| 487 // This happens once an isolate has finished loading. |
| 488 void Loader::RemoveLoader(Dart_Port port) { |
| 489 const intptr_t index = LoaderIndexFor(port); |
| 490 ASSERT(index >= 0); |
| 491 const intptr_t last = loader_infos_length_ - 1; |
| 492 ASSERT(last >= 0); |
| 493 if (index != last) { |
| 494 // Swap with the tail. |
| 495 loader_infos_[index] = loader_infos_[last]; |
| 496 } |
| 497 loader_infos_length_--; |
| 498 } |
| 499 |
| 500 |
| 501 intptr_t Loader::LoaderIndexFor(Dart_Port port) { |
| 502 for (intptr_t i = 0; i < loader_infos_length_; i++) { |
| 503 if (loader_infos_[i].port == port) { |
| 504 return i; |
| 505 } |
| 506 } |
| 507 return -1; |
| 508 } |
| 509 |
| 510 |
| 511 Loader* Loader::LoaderFor(Dart_Port port) { |
| 512 intptr_t index = LoaderIndexFor(port); |
| 513 if (index < 0) { |
| 514 return NULL; |
| 515 } |
| 516 return loader_infos_[index].isolate_data->loader(); |
| 517 } |
| 518 |
| 519 |
| 520 void Loader::NativeMessageHandler(Dart_Port dest_port_id, |
| 521 Dart_CObject* message) { |
| 522 Loader* loader = LoaderFor(dest_port_id); |
| 523 if (loader == NULL) { |
| 524 return; |
| 525 } |
| 526 loader->QueueMessage(message); |
| 527 } |
| 528 |
| 529 } // namespace bin |
| 530 } // namespace dart |
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