Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/debug/debug-scopes.h" |
| 6 | |
| 7 | #include "src/ast/scopes.h" |
| 8 | #include "src/debug/debug.h" |
| 9 | #include "src/frames-inl.h" |
| 10 | #include "src/globals.h" |
| 11 | #include "src/isolate-inl.h" |
| 12 | #include "src/parsing/parser.h" |
| 13 | |
| 14 | namespace v8 { |
| 15 | namespace internal { |
| 16 | |
| 17 | ScopeIterator::ScopeIterator(Isolate* isolate, FrameInspector* frame_inspector, |
| 18 | ScopeIterator::Option option) |
| 19 | : isolate_(isolate), |
| 20 | frame_inspector_(frame_inspector), |
| 21 | nested_scope_chain_(4), |
| 22 | non_locals_(nullptr), |
| 23 | seen_script_scope_(false), |
| 24 | failed_(false) { |
| 25 | if (!frame_inspector->GetContext()->IsContext() || |
| 26 | !frame_inspector->GetFunction()->IsJSFunction()) { |
| 27 | // Optimized frame, context or function cannot be materialized. Give up. |
| 28 | return; |
| 29 | } |
| 30 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 31 | context_ = Handle<Context>::cast(frame_inspector->GetContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 32 | |
| 33 | // Catch the case when the debugger stops in an internal function. |
| 34 | Handle<JSFunction> function = GetFunction(); |
| 35 | Handle<SharedFunctionInfo> shared_info(function->shared()); |
| 36 | Handle<ScopeInfo> scope_info(shared_info->scope_info()); |
| 37 | if (shared_info->script() == isolate->heap()->undefined_value()) { |
| 38 | while (context_->closure() == *function) { |
| 39 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 40 | } |
| 41 | return; |
| 42 | } |
| 43 | |
| 44 | // Currently it takes too much time to find nested scopes due to script |
| 45 | // parsing. Sometimes we want to run the ScopeIterator as fast as possible |
| 46 | // (for example, while collecting async call stacks on every |
| 47 | // addEventListener call), even if we drop some nested scopes. |
| 48 | // Later we may optimize getting the nested scopes (cache the result?) |
| 49 | // and include nested scopes into the "fast" iteration case as well. |
| 50 | bool ignore_nested_scopes = (option == IGNORE_NESTED_SCOPES); |
| 51 | bool collect_non_locals = (option == COLLECT_NON_LOCALS); |
| 52 | if (!ignore_nested_scopes && shared_info->HasDebugInfo()) { |
| 53 | // The source position at return is always the end of the function, |
| 54 | // which is not consistent with the current scope chain. Therefore all |
| 55 | // nested with, catch and block contexts are skipped, and we can only |
| 56 | // inspect the function scope. |
| 57 | // This can only happen if we set a break point inside right before the |
| 58 | // return, which requires a debug info to be available. |
| 59 | Handle<DebugInfo> debug_info(shared_info->GetDebugInfo()); |
| 60 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 61 | // Find the break point where execution has stopped. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 62 | BreakLocation location = BreakLocation::FromFrame(debug_info, GetFrame()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 63 | |
| 64 | ignore_nested_scopes = location.IsReturn(); |
| 65 | } |
| 66 | |
| 67 | if (ignore_nested_scopes) { |
| 68 | if (scope_info->HasContext()) { |
| 69 | context_ = Handle<Context>(context_->declaration_context(), isolate_); |
| 70 | } else { |
| 71 | while (context_->closure() == *function) { |
| 72 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 73 | } |
| 74 | } |
| 75 | if (scope_info->scope_type() == FUNCTION_SCOPE) { |
| 76 | nested_scope_chain_.Add(scope_info); |
| 77 | } |
| 78 | if (!collect_non_locals) return; |
| 79 | } |
| 80 | |
| 81 | // Reparse the code and analyze the scopes. |
| 82 | Scope* scope = NULL; |
| 83 | // Check whether we are in global, eval or function code. |
| 84 | Zone zone; |
| 85 | if (scope_info->scope_type() != FUNCTION_SCOPE) { |
| 86 | // Global or eval code. |
| 87 | Handle<Script> script(Script::cast(shared_info->script())); |
| 88 | ParseInfo info(&zone, script); |
| 89 | if (scope_info->scope_type() == SCRIPT_SCOPE) { |
| 90 | info.set_global(); |
| 91 | } else { |
| 92 | DCHECK(scope_info->scope_type() == EVAL_SCOPE); |
| 93 | info.set_eval(); |
| 94 | info.set_context(Handle<Context>(function->context())); |
| 95 | } |
| 96 | if (Parser::ParseStatic(&info) && Scope::Analyze(&info)) { |
| 97 | scope = info.literal()->scope(); |
| 98 | } |
| 99 | if (!ignore_nested_scopes) RetrieveScopeChain(scope); |
| 100 | if (collect_non_locals) CollectNonLocals(scope); |
| 101 | } else { |
| 102 | // Function code |
| 103 | ParseInfo info(&zone, function); |
| 104 | if (Parser::ParseStatic(&info) && Scope::Analyze(&info)) { |
| 105 | scope = info.literal()->scope(); |
| 106 | } |
| 107 | if (!ignore_nested_scopes) RetrieveScopeChain(scope); |
| 108 | if (collect_non_locals) CollectNonLocals(scope); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | |
| 113 | ScopeIterator::ScopeIterator(Isolate* isolate, Handle<JSFunction> function) |
| 114 | : isolate_(isolate), |
| 115 | frame_inspector_(NULL), |
| 116 | context_(function->context()), |
| 117 | non_locals_(nullptr), |
| 118 | seen_script_scope_(false), |
| 119 | failed_(false) { |
| 120 | if (!function->shared()->IsSubjectToDebugging()) context_ = Handle<Context>(); |
| 121 | } |
| 122 | |
| 123 | |
| 124 | MUST_USE_RESULT MaybeHandle<JSObject> ScopeIterator::MaterializeScopeDetails() { |
| 125 | // Calculate the size of the result. |
| 126 | Handle<FixedArray> details = |
| 127 | isolate_->factory()->NewFixedArray(kScopeDetailsSize); |
| 128 | // Fill in scope details. |
| 129 | details->set(kScopeDetailsTypeIndex, Smi::FromInt(Type())); |
| 130 | Handle<JSObject> scope_object; |
| 131 | ASSIGN_RETURN_ON_EXCEPTION(isolate_, scope_object, ScopeObject(), JSObject); |
| 132 | details->set(kScopeDetailsObjectIndex, *scope_object); |
| 133 | if (HasContext() && CurrentContext()->closure() != NULL) { |
| 134 | Handle<String> closure_name = JSFunction::GetDebugName( |
| 135 | Handle<JSFunction>(CurrentContext()->closure())); |
| 136 | if (!closure_name.is_null() && (closure_name->length() != 0)) |
| 137 | details->set(kScopeDetailsNameIndex, *closure_name); |
| 138 | } |
| 139 | return isolate_->factory()->NewJSArrayWithElements(details); |
| 140 | } |
| 141 | |
| 142 | |
| 143 | void ScopeIterator::Next() { |
| 144 | DCHECK(!failed_); |
| 145 | ScopeType scope_type = Type(); |
| 146 | if (scope_type == ScopeTypeGlobal) { |
| 147 | // The global scope is always the last in the chain. |
| 148 | DCHECK(context_->IsNativeContext()); |
| 149 | context_ = Handle<Context>(); |
| 150 | return; |
| 151 | } |
| 152 | if (scope_type == ScopeTypeScript) { |
| 153 | seen_script_scope_ = true; |
| 154 | if (context_->IsScriptContext()) { |
| 155 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 156 | } |
| 157 | if (!nested_scope_chain_.is_empty()) { |
| 158 | DCHECK_EQ(nested_scope_chain_.last()->scope_type(), SCRIPT_SCOPE); |
| 159 | nested_scope_chain_.RemoveLast(); |
| 160 | DCHECK(nested_scope_chain_.is_empty()); |
| 161 | } |
| 162 | CHECK(context_->IsNativeContext()); |
| 163 | return; |
| 164 | } |
| 165 | if (nested_scope_chain_.is_empty()) { |
| 166 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 167 | } else { |
| 168 | if (nested_scope_chain_.last()->HasContext()) { |
| 169 | DCHECK(context_->previous() != NULL); |
| 170 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 171 | } |
| 172 | nested_scope_chain_.RemoveLast(); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | |
| 177 | // Return the type of the current scope. |
| 178 | ScopeIterator::ScopeType ScopeIterator::Type() { |
| 179 | DCHECK(!failed_); |
| 180 | if (!nested_scope_chain_.is_empty()) { |
| 181 | Handle<ScopeInfo> scope_info = nested_scope_chain_.last(); |
| 182 | switch (scope_info->scope_type()) { |
| 183 | case FUNCTION_SCOPE: |
| 184 | DCHECK(context_->IsFunctionContext() || !scope_info->HasContext()); |
| 185 | return ScopeTypeLocal; |
| 186 | case MODULE_SCOPE: |
| 187 | DCHECK(context_->IsModuleContext()); |
| 188 | return ScopeTypeModule; |
| 189 | case SCRIPT_SCOPE: |
| 190 | DCHECK(context_->IsScriptContext() || context_->IsNativeContext()); |
| 191 | return ScopeTypeScript; |
| 192 | case WITH_SCOPE: |
| 193 | DCHECK(context_->IsWithContext()); |
| 194 | return ScopeTypeWith; |
| 195 | case CATCH_SCOPE: |
| 196 | DCHECK(context_->IsCatchContext()); |
| 197 | return ScopeTypeCatch; |
| 198 | case BLOCK_SCOPE: |
| 199 | DCHECK(!scope_info->HasContext() || context_->IsBlockContext()); |
| 200 | return ScopeTypeBlock; |
| 201 | case EVAL_SCOPE: |
| 202 | UNREACHABLE(); |
| 203 | } |
| 204 | } |
| 205 | if (context_->IsNativeContext()) { |
| 206 | DCHECK(context_->global_object()->IsJSGlobalObject()); |
| 207 | // If we are at the native context and have not yet seen script scope, |
| 208 | // fake it. |
| 209 | return seen_script_scope_ ? ScopeTypeGlobal : ScopeTypeScript; |
| 210 | } |
| 211 | if (context_->IsFunctionContext()) { |
| 212 | return ScopeTypeClosure; |
| 213 | } |
| 214 | if (context_->IsCatchContext()) { |
| 215 | return ScopeTypeCatch; |
| 216 | } |
| 217 | if (context_->IsBlockContext()) { |
| 218 | return ScopeTypeBlock; |
| 219 | } |
| 220 | if (context_->IsModuleContext()) { |
| 221 | return ScopeTypeModule; |
| 222 | } |
| 223 | if (context_->IsScriptContext()) { |
| 224 | return ScopeTypeScript; |
| 225 | } |
| 226 | DCHECK(context_->IsWithContext()); |
| 227 | return ScopeTypeWith; |
| 228 | } |
| 229 | |
| 230 | |
| 231 | MaybeHandle<JSObject> ScopeIterator::ScopeObject() { |
| 232 | DCHECK(!failed_); |
| 233 | switch (Type()) { |
| 234 | case ScopeIterator::ScopeTypeGlobal: |
| 235 | return Handle<JSObject>(CurrentContext()->global_proxy()); |
| 236 | case ScopeIterator::ScopeTypeScript: |
| 237 | return MaterializeScriptScope(); |
| 238 | case ScopeIterator::ScopeTypeLocal: |
| 239 | // Materialize the content of the local scope into a JSObject. |
| 240 | DCHECK(nested_scope_chain_.length() == 1); |
| 241 | return MaterializeLocalScope(); |
| 242 | case ScopeIterator::ScopeTypeWith: |
| 243 | // Return the with object. |
| 244 | // TODO(neis): This breaks for proxies. |
| 245 | return handle(JSObject::cast(CurrentContext()->extension_receiver())); |
| 246 | case ScopeIterator::ScopeTypeCatch: |
| 247 | return MaterializeCatchScope(); |
| 248 | case ScopeIterator::ScopeTypeClosure: |
| 249 | // Materialize the content of the closure scope into a JSObject. |
| 250 | return MaterializeClosure(); |
| 251 | case ScopeIterator::ScopeTypeBlock: |
| 252 | return MaterializeBlockScope(); |
| 253 | case ScopeIterator::ScopeTypeModule: |
| 254 | return MaterializeModuleScope(); |
| 255 | } |
| 256 | UNREACHABLE(); |
| 257 | return Handle<JSObject>(); |
| 258 | } |
| 259 | |
| 260 | |
| 261 | bool ScopeIterator::HasContext() { |
| 262 | ScopeType type = Type(); |
| 263 | if (type == ScopeTypeBlock || type == ScopeTypeLocal) { |
| 264 | if (!nested_scope_chain_.is_empty()) { |
| 265 | return nested_scope_chain_.last()->HasContext(); |
| 266 | } |
| 267 | } |
| 268 | return true; |
| 269 | } |
| 270 | |
| 271 | |
| 272 | bool ScopeIterator::SetVariableValue(Handle<String> variable_name, |
| 273 | Handle<Object> new_value) { |
| 274 | DCHECK(!failed_); |
| 275 | switch (Type()) { |
| 276 | case ScopeIterator::ScopeTypeGlobal: |
| 277 | break; |
| 278 | case ScopeIterator::ScopeTypeLocal: |
| 279 | return SetLocalVariableValue(variable_name, new_value); |
| 280 | case ScopeIterator::ScopeTypeWith: |
| 281 | break; |
| 282 | case ScopeIterator::ScopeTypeCatch: |
| 283 | return SetCatchVariableValue(variable_name, new_value); |
| 284 | case ScopeIterator::ScopeTypeClosure: |
| 285 | return SetClosureVariableValue(variable_name, new_value); |
| 286 | case ScopeIterator::ScopeTypeScript: |
| 287 | return SetScriptVariableValue(variable_name, new_value); |
| 288 | case ScopeIterator::ScopeTypeBlock: |
| 289 | return SetBlockVariableValue(variable_name, new_value); |
| 290 | case ScopeIterator::ScopeTypeModule: |
| 291 | // TODO(2399): should we implement it? |
| 292 | break; |
| 293 | } |
| 294 | return false; |
| 295 | } |
| 296 | |
| 297 | |
| 298 | Handle<ScopeInfo> ScopeIterator::CurrentScopeInfo() { |
| 299 | DCHECK(!failed_); |
| 300 | if (!nested_scope_chain_.is_empty()) { |
| 301 | return nested_scope_chain_.last(); |
| 302 | } else if (context_->IsBlockContext()) { |
| 303 | return Handle<ScopeInfo>(context_->scope_info()); |
| 304 | } else if (context_->IsFunctionContext()) { |
| 305 | return Handle<ScopeInfo>(context_->closure()->shared()->scope_info()); |
| 306 | } |
| 307 | return Handle<ScopeInfo>::null(); |
| 308 | } |
| 309 | |
| 310 | |
| 311 | Handle<Context> ScopeIterator::CurrentContext() { |
| 312 | DCHECK(!failed_); |
| 313 | if (Type() == ScopeTypeGlobal || Type() == ScopeTypeScript || |
| 314 | nested_scope_chain_.is_empty()) { |
| 315 | return context_; |
| 316 | } else if (nested_scope_chain_.last()->HasContext()) { |
| 317 | return context_; |
| 318 | } else { |
| 319 | return Handle<Context>(); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | |
| 324 | void ScopeIterator::GetNonLocals(List<Handle<String> >* list_out) { |
| 325 | Handle<String> this_string = isolate_->factory()->this_string(); |
| 326 | for (HashMap::Entry* entry = non_locals_->Start(); entry != nullptr; |
| 327 | entry = non_locals_->Next(entry)) { |
| 328 | Handle<String> name(reinterpret_cast<String**>(entry->key)); |
| 329 | // We need to treat "this" differently. |
| 330 | if (name.is_identical_to(this_string)) continue; |
| 331 | list_out->Add(Handle<String>(reinterpret_cast<String**>(entry->key))); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | |
| 336 | bool ScopeIterator::ThisIsNonLocal() { |
| 337 | Handle<String> this_string = isolate_->factory()->this_string(); |
| 338 | void* key = reinterpret_cast<void*>(this_string.location()); |
| 339 | HashMap::Entry* entry = non_locals_->Lookup(key, this_string->Hash()); |
| 340 | return entry != nullptr; |
| 341 | } |
| 342 | |
| 343 | |
| 344 | #ifdef DEBUG |
| 345 | // Debug print of the content of the current scope. |
| 346 | void ScopeIterator::DebugPrint() { |
| 347 | OFStream os(stdout); |
| 348 | DCHECK(!failed_); |
| 349 | switch (Type()) { |
| 350 | case ScopeIterator::ScopeTypeGlobal: |
| 351 | os << "Global:\n"; |
| 352 | CurrentContext()->Print(os); |
| 353 | break; |
| 354 | |
| 355 | case ScopeIterator::ScopeTypeLocal: { |
| 356 | os << "Local:\n"; |
| 357 | GetFunction()->shared()->scope_info()->Print(); |
| 358 | if (!CurrentContext().is_null()) { |
| 359 | CurrentContext()->Print(os); |
| 360 | if (CurrentContext()->has_extension()) { |
| 361 | Handle<HeapObject> extension(CurrentContext()->extension(), isolate_); |
| 362 | if (extension->IsJSContextExtensionObject()) { |
| 363 | extension->Print(os); |
| 364 | } |
| 365 | } |
| 366 | } |
| 367 | break; |
| 368 | } |
| 369 | |
| 370 | case ScopeIterator::ScopeTypeWith: |
| 371 | os << "With:\n"; |
| 372 | CurrentContext()->extension()->Print(os); |
| 373 | break; |
| 374 | |
| 375 | case ScopeIterator::ScopeTypeCatch: |
| 376 | os << "Catch:\n"; |
| 377 | CurrentContext()->extension()->Print(os); |
| 378 | CurrentContext()->get(Context::THROWN_OBJECT_INDEX)->Print(os); |
| 379 | break; |
| 380 | |
| 381 | case ScopeIterator::ScopeTypeClosure: |
| 382 | os << "Closure:\n"; |
| 383 | CurrentContext()->Print(os); |
| 384 | if (CurrentContext()->has_extension()) { |
| 385 | Handle<HeapObject> extension(CurrentContext()->extension(), isolate_); |
| 386 | if (extension->IsJSContextExtensionObject()) { |
| 387 | extension->Print(os); |
| 388 | } |
| 389 | } |
| 390 | break; |
| 391 | |
| 392 | case ScopeIterator::ScopeTypeScript: |
| 393 | os << "Script:\n"; |
| 394 | CurrentContext() |
| 395 | ->global_object() |
| 396 | ->native_context() |
| 397 | ->script_context_table() |
| 398 | ->Print(os); |
| 399 | break; |
| 400 | |
| 401 | default: |
| 402 | UNREACHABLE(); |
| 403 | } |
| 404 | PrintF("\n"); |
| 405 | } |
| 406 | #endif |
| 407 | |
| 408 | |
| 409 | void ScopeIterator::RetrieveScopeChain(Scope* scope) { |
| 410 | if (scope != NULL) { |
| 411 | int source_position = frame_inspector_->GetSourcePosition(); |
| 412 | scope->GetNestedScopeChain(isolate_, &nested_scope_chain_, source_position); |
| 413 | } else { |
| 414 | // A failed reparse indicates that the preparser has diverged from the |
| 415 | // parser or that the preparse data given to the initial parse has been |
| 416 | // faulty. We fail in debug mode but in release mode we only provide the |
| 417 | // information we get from the context chain but nothing about |
| 418 | // completely stack allocated scopes or stack allocated locals. |
| 419 | // Or it could be due to stack overflow. |
| 420 | DCHECK(isolate_->has_pending_exception()); |
| 421 | failed_ = true; |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | |
| 426 | void ScopeIterator::CollectNonLocals(Scope* scope) { |
| 427 | if (scope != NULL) { |
| 428 | DCHECK_NULL(non_locals_); |
| 429 | non_locals_ = new HashMap(InternalizedStringMatch); |
| 430 | scope->CollectNonLocals(non_locals_); |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | |
| 435 | MaybeHandle<JSObject> ScopeIterator::MaterializeScriptScope() { |
| 436 | Handle<JSGlobalObject> global(CurrentContext()->global_object()); |
| 437 | Handle<ScriptContextTable> script_contexts( |
| 438 | global->native_context()->script_context_table()); |
| 439 | |
| 440 | Handle<JSObject> script_scope = |
| 441 | isolate_->factory()->NewJSObject(isolate_->object_function()); |
| 442 | |
| 443 | for (int context_index = 0; context_index < script_contexts->used(); |
| 444 | context_index++) { |
| 445 | Handle<Context> context = |
| 446 | ScriptContextTable::GetContext(script_contexts, context_index); |
| 447 | Handle<ScopeInfo> scope_info(context->scope_info()); |
| 448 | CopyContextLocalsToScopeObject(scope_info, context, script_scope); |
| 449 | } |
| 450 | return script_scope; |
| 451 | } |
| 452 | |
| 453 | |
| 454 | MaybeHandle<JSObject> ScopeIterator::MaterializeLocalScope() { |
| 455 | Handle<JSFunction> function = GetFunction(); |
| 456 | |
| 457 | Handle<JSObject> local_scope = |
| 458 | isolate_->factory()->NewJSObject(isolate_->object_function()); |
| 459 | frame_inspector_->MaterializeStackLocals(local_scope, function); |
| 460 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 461 | Handle<Context> frame_context = |
| 462 | Handle<Context>::cast(frame_inspector_->GetContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 463 | |
| 464 | HandleScope scope(isolate_); |
| 465 | Handle<SharedFunctionInfo> shared(function->shared()); |
| 466 | Handle<ScopeInfo> scope_info(shared->scope_info()); |
| 467 | |
| 468 | if (!scope_info->HasContext()) return local_scope; |
| 469 | |
| 470 | // Third fill all context locals. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 471 | Handle<Context> function_context(frame_context->closure_context()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 472 | CopyContextLocalsToScopeObject(scope_info, function_context, local_scope); |
| 473 | |
| 474 | // Finally copy any properties from the function context extension. |
| 475 | // These will be variables introduced by eval. |
| 476 | if (function_context->closure() == *function && |
| 477 | function_context->has_extension() && |
| 478 | !function_context->IsNativeContext()) { |
| 479 | bool success = CopyContextExtensionToScopeObject( |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 480 | handle(function_context->extension_object(), isolate_), local_scope, |
| 481 | INCLUDE_PROTOS); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 482 | if (!success) return MaybeHandle<JSObject>(); |
| 483 | } |
| 484 | |
| 485 | return local_scope; |
| 486 | } |
| 487 | |
| 488 | |
| 489 | // Create a plain JSObject which materializes the closure content for the |
| 490 | // context. |
| 491 | Handle<JSObject> ScopeIterator::MaterializeClosure() { |
| 492 | Handle<Context> context = CurrentContext(); |
| 493 | DCHECK(context->IsFunctionContext()); |
| 494 | |
| 495 | Handle<SharedFunctionInfo> shared(context->closure()->shared()); |
| 496 | Handle<ScopeInfo> scope_info(shared->scope_info()); |
| 497 | |
| 498 | // Allocate and initialize a JSObject with all the content of this function |
| 499 | // closure. |
| 500 | Handle<JSObject> closure_scope = |
| 501 | isolate_->factory()->NewJSObject(isolate_->object_function()); |
| 502 | |
| 503 | // Fill all context locals to the context extension. |
| 504 | CopyContextLocalsToScopeObject(scope_info, context, closure_scope); |
| 505 | |
| 506 | // Finally copy any properties from the function context extension. This will |
| 507 | // be variables introduced by eval. |
| 508 | if (context->has_extension()) { |
| 509 | bool success = CopyContextExtensionToScopeObject( |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 510 | handle(context->extension_object(), isolate_), closure_scope, OWN_ONLY); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 511 | DCHECK(success); |
| 512 | USE(success); |
| 513 | } |
| 514 | |
| 515 | return closure_scope; |
| 516 | } |
| 517 | |
| 518 | |
| 519 | // Create a plain JSObject which materializes the scope for the specified |
| 520 | // catch context. |
| 521 | Handle<JSObject> ScopeIterator::MaterializeCatchScope() { |
| 522 | Handle<Context> context = CurrentContext(); |
| 523 | DCHECK(context->IsCatchContext()); |
| 524 | Handle<String> name(context->catch_name()); |
| 525 | Handle<Object> thrown_object(context->get(Context::THROWN_OBJECT_INDEX), |
| 526 | isolate_); |
| 527 | Handle<JSObject> catch_scope = |
| 528 | isolate_->factory()->NewJSObject(isolate_->object_function()); |
| 529 | JSObject::SetOwnPropertyIgnoreAttributes(catch_scope, name, thrown_object, |
| 530 | NONE) |
| 531 | .Check(); |
| 532 | return catch_scope; |
| 533 | } |
| 534 | |
| 535 | |
| 536 | // Create a plain JSObject which materializes the block scope for the specified |
| 537 | // block context. |
| 538 | Handle<JSObject> ScopeIterator::MaterializeBlockScope() { |
| 539 | Handle<JSObject> block_scope = |
| 540 | isolate_->factory()->NewJSObject(isolate_->object_function()); |
| 541 | |
| 542 | Handle<Context> context = Handle<Context>::null(); |
| 543 | if (!nested_scope_chain_.is_empty()) { |
| 544 | Handle<ScopeInfo> scope_info = nested_scope_chain_.last(); |
| 545 | frame_inspector_->MaterializeStackLocals(block_scope, scope_info); |
| 546 | if (scope_info->HasContext()) context = CurrentContext(); |
| 547 | } else { |
| 548 | context = CurrentContext(); |
| 549 | } |
| 550 | |
| 551 | if (!context.is_null()) { |
| 552 | // Fill all context locals. |
| 553 | CopyContextLocalsToScopeObject(handle(context->scope_info()), |
| 554 | context, block_scope); |
| 555 | // Fill all extension variables. |
| 556 | if (context->extension_object() != nullptr) { |
| 557 | bool success = CopyContextExtensionToScopeObject( |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 558 | handle(context->extension_object()), block_scope, OWN_ONLY); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 559 | DCHECK(success); |
| 560 | USE(success); |
| 561 | } |
| 562 | } |
| 563 | return block_scope; |
| 564 | } |
| 565 | |
| 566 | |
| 567 | // Create a plain JSObject which materializes the module scope for the specified |
| 568 | // module context. |
| 569 | MaybeHandle<JSObject> ScopeIterator::MaterializeModuleScope() { |
| 570 | Handle<Context> context = CurrentContext(); |
| 571 | DCHECK(context->IsModuleContext()); |
| 572 | Handle<ScopeInfo> scope_info(context->scope_info()); |
| 573 | |
| 574 | // Allocate and initialize a JSObject with all the members of the debugged |
| 575 | // module. |
| 576 | Handle<JSObject> module_scope = |
| 577 | isolate_->factory()->NewJSObject(isolate_->object_function()); |
| 578 | |
| 579 | // Fill all context locals. |
| 580 | CopyContextLocalsToScopeObject(scope_info, context, module_scope); |
| 581 | |
| 582 | return module_scope; |
| 583 | } |
| 584 | |
| 585 | |
| 586 | // Set the context local variable value. |
| 587 | bool ScopeIterator::SetContextLocalValue(Handle<ScopeInfo> scope_info, |
| 588 | Handle<Context> context, |
| 589 | Handle<String> variable_name, |
| 590 | Handle<Object> new_value) { |
| 591 | for (int i = 0; i < scope_info->ContextLocalCount(); i++) { |
| 592 | Handle<String> next_name(scope_info->ContextLocalName(i)); |
| 593 | if (String::Equals(variable_name, next_name)) { |
| 594 | VariableMode mode; |
| 595 | InitializationFlag init_flag; |
| 596 | MaybeAssignedFlag maybe_assigned_flag; |
| 597 | int context_index = ScopeInfo::ContextSlotIndex( |
| 598 | scope_info, next_name, &mode, &init_flag, &maybe_assigned_flag); |
| 599 | context->set(context_index, *new_value); |
| 600 | return true; |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | return false; |
| 605 | } |
| 606 | |
| 607 | |
| 608 | bool ScopeIterator::SetLocalVariableValue(Handle<String> variable_name, |
| 609 | Handle<Object> new_value) { |
| 610 | JavaScriptFrame* frame = GetFrame(); |
| 611 | // Optimized frames are not supported. |
| 612 | if (frame->is_optimized()) return false; |
| 613 | |
| 614 | Handle<JSFunction> function(frame->function()); |
| 615 | Handle<SharedFunctionInfo> shared(function->shared()); |
| 616 | Handle<ScopeInfo> scope_info(shared->scope_info()); |
| 617 | |
| 618 | bool default_result = false; |
| 619 | |
| 620 | // Parameters. |
| 621 | for (int i = 0; i < scope_info->ParameterCount(); ++i) { |
| 622 | HandleScope scope(isolate_); |
| 623 | if (String::Equals(handle(scope_info->ParameterName(i)), variable_name)) { |
| 624 | frame->SetParameterValue(i, *new_value); |
| 625 | // Argument might be shadowed in heap context, don't stop here. |
| 626 | default_result = true; |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | // Stack locals. |
| 631 | for (int i = 0; i < scope_info->StackLocalCount(); ++i) { |
| 632 | HandleScope scope(isolate_); |
| 633 | if (String::Equals(handle(scope_info->StackLocalName(i)), variable_name)) { |
| 634 | frame->SetExpression(scope_info->StackLocalIndex(i), *new_value); |
| 635 | return true; |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | if (scope_info->HasContext()) { |
| 640 | // Context locals. |
| 641 | Handle<Context> frame_context(Context::cast(frame->context())); |
| 642 | Handle<Context> function_context(frame_context->declaration_context()); |
| 643 | if (SetContextLocalValue(scope_info, function_context, variable_name, |
| 644 | new_value)) { |
| 645 | return true; |
| 646 | } |
| 647 | |
| 648 | // Function context extension. These are variables introduced by eval. |
| 649 | if (function_context->closure() == *function) { |
| 650 | if (function_context->has_extension() && |
| 651 | !function_context->IsNativeContext()) { |
| 652 | Handle<JSObject> ext(function_context->extension_object()); |
| 653 | |
| 654 | Maybe<bool> maybe = JSReceiver::HasProperty(ext, variable_name); |
| 655 | DCHECK(maybe.IsJust()); |
| 656 | if (maybe.FromJust()) { |
| 657 | // We don't expect this to do anything except replacing |
| 658 | // property value. |
| 659 | Runtime::SetObjectProperty(isolate_, ext, variable_name, new_value, |
| 660 | SLOPPY) |
| 661 | .Assert(); |
| 662 | return true; |
| 663 | } |
| 664 | } |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | return default_result; |
| 669 | } |
| 670 | |
| 671 | |
| 672 | bool ScopeIterator::SetBlockVariableValue(Handle<String> variable_name, |
| 673 | Handle<Object> new_value) { |
| 674 | Handle<ScopeInfo> scope_info = CurrentScopeInfo(); |
| 675 | JavaScriptFrame* frame = GetFrame(); |
| 676 | |
| 677 | for (int i = 0; i < scope_info->StackLocalCount(); ++i) { |
| 678 | HandleScope scope(isolate_); |
| 679 | if (String::Equals(handle(scope_info->StackLocalName(i)), variable_name)) { |
| 680 | frame->SetExpression(scope_info->StackLocalIndex(i), *new_value); |
| 681 | return true; |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | if (HasContext()) { |
| 686 | Handle<Context> context = CurrentContext(); |
| 687 | if (SetContextLocalValue(scope_info, context, variable_name, new_value)) { |
| 688 | return true; |
| 689 | } |
| 690 | |
| 691 | Handle<JSObject> ext(context->extension_object(), isolate_); |
| 692 | if (!ext.is_null()) { |
| 693 | Maybe<bool> maybe = JSReceiver::HasOwnProperty(ext, variable_name); |
| 694 | DCHECK(maybe.IsJust()); |
| 695 | if (maybe.FromJust()) { |
| 696 | // We don't expect this to do anything except replacing property value. |
| 697 | JSObject::SetOwnPropertyIgnoreAttributes(ext, variable_name, new_value, |
| 698 | NONE) |
| 699 | .Check(); |
| 700 | return true; |
| 701 | } |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | return false; |
| 706 | } |
| 707 | |
| 708 | |
| 709 | // This method copies structure of MaterializeClosure method above. |
| 710 | bool ScopeIterator::SetClosureVariableValue(Handle<String> variable_name, |
| 711 | Handle<Object> new_value) { |
| 712 | Handle<Context> context = CurrentContext(); |
| 713 | DCHECK(context->IsFunctionContext()); |
| 714 | |
| 715 | // Context locals to the context extension. |
| 716 | Handle<SharedFunctionInfo> shared(context->closure()->shared()); |
| 717 | Handle<ScopeInfo> scope_info(shared->scope_info()); |
| 718 | if (SetContextLocalValue(scope_info, context, variable_name, new_value)) { |
| 719 | return true; |
| 720 | } |
| 721 | |
| 722 | // Properties from the function context extension. This will |
| 723 | // be variables introduced by eval. |
| 724 | if (context->has_extension()) { |
| 725 | Handle<JSObject> ext(JSObject::cast(context->extension_object())); |
| 726 | Maybe<bool> maybe = JSReceiver::HasOwnProperty(ext, variable_name); |
| 727 | DCHECK(maybe.IsJust()); |
| 728 | if (maybe.FromJust()) { |
| 729 | // We don't expect this to do anything except replacing property value. |
| 730 | JSObject::SetOwnPropertyIgnoreAttributes(ext, variable_name, new_value, |
| 731 | NONE) |
| 732 | .Check(); |
| 733 | return true; |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | return false; |
| 738 | } |
| 739 | |
| 740 | |
| 741 | bool ScopeIterator::SetScriptVariableValue(Handle<String> variable_name, |
| 742 | Handle<Object> new_value) { |
| 743 | Handle<Context> context = CurrentContext(); |
| 744 | Handle<ScriptContextTable> script_contexts( |
| 745 | context->global_object()->native_context()->script_context_table()); |
| 746 | ScriptContextTable::LookupResult lookup_result; |
| 747 | if (ScriptContextTable::Lookup(script_contexts, variable_name, |
| 748 | &lookup_result)) { |
| 749 | Handle<Context> script_context = ScriptContextTable::GetContext( |
| 750 | script_contexts, lookup_result.context_index); |
| 751 | script_context->set(lookup_result.slot_index, *new_value); |
| 752 | return true; |
| 753 | } |
| 754 | |
| 755 | return false; |
| 756 | } |
| 757 | |
| 758 | |
| 759 | bool ScopeIterator::SetCatchVariableValue(Handle<String> variable_name, |
| 760 | Handle<Object> new_value) { |
| 761 | Handle<Context> context = CurrentContext(); |
| 762 | DCHECK(context->IsCatchContext()); |
| 763 | Handle<String> name(context->catch_name()); |
| 764 | if (!String::Equals(name, variable_name)) { |
| 765 | return false; |
| 766 | } |
| 767 | context->set(Context::THROWN_OBJECT_INDEX, *new_value); |
| 768 | return true; |
| 769 | } |
| 770 | |
| 771 | |
| 772 | void ScopeIterator::CopyContextLocalsToScopeObject( |
| 773 | Handle<ScopeInfo> scope_info, Handle<Context> context, |
| 774 | Handle<JSObject> scope_object) { |
| 775 | Isolate* isolate = scope_info->GetIsolate(); |
| 776 | int local_count = scope_info->ContextLocalCount(); |
| 777 | if (local_count == 0) return; |
| 778 | // Fill all context locals to the context extension. |
| 779 | int first_context_var = scope_info->StackLocalCount(); |
| 780 | int start = scope_info->ContextLocalNameEntriesIndex(); |
| 781 | for (int i = 0; i < local_count; ++i) { |
| 782 | if (scope_info->LocalIsSynthetic(first_context_var + i)) continue; |
| 783 | int context_index = Context::MIN_CONTEXT_SLOTS + i; |
| 784 | Handle<Object> value = Handle<Object>(context->get(context_index), isolate); |
| 785 | // Reflect variables under TDZ as undefined in scope object. |
| 786 | if (value->IsTheHole()) continue; |
| 787 | // This should always succeed. |
| 788 | // TODO(verwaest): Use AddDataProperty instead. |
| 789 | JSObject::SetOwnPropertyIgnoreAttributes( |
| 790 | scope_object, handle(String::cast(scope_info->get(i + start))), value, |
| 791 | NONE) |
| 792 | .Check(); |
| 793 | } |
| 794 | } |
| 795 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 796 | bool ScopeIterator::CopyContextExtensionToScopeObject( |
| 797 | Handle<JSObject> extension, Handle<JSObject> scope_object, |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 798 | KeyCollectionType type) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 799 | Handle<FixedArray> keys; |
| 800 | ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| 801 | isolate_, keys, JSReceiver::GetKeys(extension, type, ENUMERABLE_STRINGS), |
| 802 | false); |
| 803 | |
| 804 | for (int i = 0; i < keys->length(); i++) { |
| 805 | // Names of variables introduced by eval are strings. |
| 806 | DCHECK(keys->get(i)->IsString()); |
| 807 | Handle<String> key(String::cast(keys->get(i))); |
| 808 | Handle<Object> value; |
| 809 | ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| 810 | isolate_, value, Object::GetPropertyOrElement(extension, key), false); |
| 811 | RETURN_ON_EXCEPTION_VALUE( |
| 812 | isolate_, JSObject::SetOwnPropertyIgnoreAttributes( |
| 813 | scope_object, key, value, NONE), false); |
| 814 | } |
| 815 | return true; |
| 816 | } |
| 817 | |
| 818 | } // namespace internal |
| 819 | } // namespace v8 |