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" |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 8 | #include "src/compiler.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 9 | #include "src/debug/debug.h" |
| 10 | #include "src/frames-inl.h" |
| 11 | #include "src/globals.h" |
| 12 | #include "src/isolate-inl.h" |
| 13 | #include "src/parsing/parser.h" |
| 14 | |
| 15 | namespace v8 { |
| 16 | namespace internal { |
| 17 | |
| 18 | ScopeIterator::ScopeIterator(Isolate* isolate, FrameInspector* frame_inspector, |
| 19 | ScopeIterator::Option option) |
| 20 | : isolate_(isolate), |
| 21 | frame_inspector_(frame_inspector), |
| 22 | nested_scope_chain_(4), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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()); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 37 | if (shared_info->script()->IsUndefined(isolate)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 76 | nested_scope_chain_.Add(ExtendedScopeInfo(scope_info, |
| 77 | shared_info->start_position(), |
| 78 | shared_info->end_position())); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 79 | } |
| 80 | if (!collect_non_locals) return; |
| 81 | } |
| 82 | |
| 83 | // Reparse the code and analyze the scopes. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 84 | // Check whether we are in global, eval or function code. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 85 | Zone zone(isolate->allocator()); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 86 | base::SmartPointer<ParseInfo> info; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 87 | if (scope_info->scope_type() != FUNCTION_SCOPE) { |
| 88 | // Global or eval code. |
| 89 | Handle<Script> script(Script::cast(shared_info->script())); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 90 | info.Reset(new ParseInfo(&zone, script)); |
| 91 | info->set_toplevel(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 92 | if (scope_info->scope_type() == SCRIPT_SCOPE) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 93 | info->set_global(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 94 | } else { |
| 95 | DCHECK(scope_info->scope_type() == EVAL_SCOPE); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 96 | info->set_eval(); |
| 97 | info->set_context(Handle<Context>(function->context())); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 98 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 99 | } else { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 100 | // Inner function. |
| 101 | info.Reset(new ParseInfo(&zone, function)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 102 | } |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 103 | Scope* scope = NULL; |
| 104 | if (Compiler::ParseAndAnalyze(info.get())) scope = info->literal()->scope(); |
| 105 | if (!ignore_nested_scopes) RetrieveScopeChain(scope); |
| 106 | if (collect_non_locals) CollectNonLocals(scope); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 107 | UnwrapEvaluationContext(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | |
| 111 | ScopeIterator::ScopeIterator(Isolate* isolate, Handle<JSFunction> function) |
| 112 | : isolate_(isolate), |
| 113 | frame_inspector_(NULL), |
| 114 | context_(function->context()), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 115 | seen_script_scope_(false), |
| 116 | failed_(false) { |
| 117 | if (!function->shared()->IsSubjectToDebugging()) context_ = Handle<Context>(); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 118 | UnwrapEvaluationContext(); |
| 119 | } |
| 120 | |
| 121 | void ScopeIterator::UnwrapEvaluationContext() { |
| 122 | while (true) { |
| 123 | if (context_.is_null()) return; |
| 124 | if (!context_->IsDebugEvaluateContext()) return; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 125 | Handle<Object> wrapped(context_->get(Context::WRAPPED_CONTEXT_INDEX), |
| 126 | isolate_); |
| 127 | if (wrapped->IsContext()) { |
| 128 | context_ = Handle<Context>::cast(wrapped); |
| 129 | } else { |
| 130 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 131 | } |
| 132 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | |
| 136 | MUST_USE_RESULT MaybeHandle<JSObject> ScopeIterator::MaterializeScopeDetails() { |
| 137 | // Calculate the size of the result. |
| 138 | Handle<FixedArray> details = |
| 139 | isolate_->factory()->NewFixedArray(kScopeDetailsSize); |
| 140 | // Fill in scope details. |
| 141 | details->set(kScopeDetailsTypeIndex, Smi::FromInt(Type())); |
| 142 | Handle<JSObject> scope_object; |
| 143 | ASSIGN_RETURN_ON_EXCEPTION(isolate_, scope_object, ScopeObject(), JSObject); |
| 144 | details->set(kScopeDetailsObjectIndex, *scope_object); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 145 | Handle<JSFunction> js_function = HasContext() |
| 146 | ? handle(CurrentContext()->closure()) |
| 147 | : Handle<JSFunction>::null(); |
| 148 | if (Type() == ScopeTypeGlobal || Type() == ScopeTypeScript) { |
| 149 | return isolate_->factory()->NewJSArrayWithElements(details); |
| 150 | } |
| 151 | |
| 152 | int start_position = 0; |
| 153 | int end_position = 0; |
| 154 | if (!nested_scope_chain_.is_empty()) { |
| 155 | js_function = GetFunction(); |
| 156 | start_position = nested_scope_chain_.last().start_position; |
| 157 | end_position = nested_scope_chain_.last().end_position; |
| 158 | } else if (!js_function.is_null()) { |
| 159 | start_position = js_function->shared()->start_position(); |
| 160 | end_position = js_function->shared()->end_position(); |
| 161 | } |
| 162 | |
| 163 | if (!js_function.is_null()) { |
| 164 | Handle<String> closure_name = JSFunction::GetDebugName(js_function); |
| 165 | if (!closure_name.is_null() && closure_name->length() != 0) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 166 | details->set(kScopeDetailsNameIndex, *closure_name); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 167 | } |
| 168 | details->set(kScopeDetailsStartPositionIndex, Smi::FromInt(start_position)); |
| 169 | details->set(kScopeDetailsEndPositionIndex, Smi::FromInt(end_position)); |
| 170 | details->set(kScopeDetailsFunctionIndex, *js_function); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 171 | } |
| 172 | return isolate_->factory()->NewJSArrayWithElements(details); |
| 173 | } |
| 174 | |
| 175 | |
| 176 | void ScopeIterator::Next() { |
| 177 | DCHECK(!failed_); |
| 178 | ScopeType scope_type = Type(); |
| 179 | if (scope_type == ScopeTypeGlobal) { |
| 180 | // The global scope is always the last in the chain. |
| 181 | DCHECK(context_->IsNativeContext()); |
| 182 | context_ = Handle<Context>(); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 183 | } else if (scope_type == ScopeTypeScript) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 184 | seen_script_scope_ = true; |
| 185 | if (context_->IsScriptContext()) { |
| 186 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 187 | } |
| 188 | if (!nested_scope_chain_.is_empty()) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 189 | DCHECK_EQ(nested_scope_chain_.last().scope_info->scope_type(), |
| 190 | SCRIPT_SCOPE); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 191 | nested_scope_chain_.RemoveLast(); |
| 192 | DCHECK(nested_scope_chain_.is_empty()); |
| 193 | } |
| 194 | CHECK(context_->IsNativeContext()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 195 | } else if (nested_scope_chain_.is_empty()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 196 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 197 | } else { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 198 | do { |
| 199 | if (nested_scope_chain_.last().scope_info->HasContext()) { |
| 200 | DCHECK(context_->previous() != NULL); |
| 201 | context_ = Handle<Context>(context_->previous(), isolate_); |
| 202 | } |
| 203 | nested_scope_chain_.RemoveLast(); |
| 204 | if (nested_scope_chain_.is_empty()) break; |
| 205 | // Repeat to skip hidden scopes. |
| 206 | } while (nested_scope_chain_.last().is_hidden()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 207 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 208 | UnwrapEvaluationContext(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | |
| 212 | // Return the type of the current scope. |
| 213 | ScopeIterator::ScopeType ScopeIterator::Type() { |
| 214 | DCHECK(!failed_); |
| 215 | if (!nested_scope_chain_.is_empty()) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 216 | Handle<ScopeInfo> scope_info = nested_scope_chain_.last().scope_info; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 217 | switch (scope_info->scope_type()) { |
| 218 | case FUNCTION_SCOPE: |
| 219 | DCHECK(context_->IsFunctionContext() || !scope_info->HasContext()); |
| 220 | return ScopeTypeLocal; |
| 221 | case MODULE_SCOPE: |
| 222 | DCHECK(context_->IsModuleContext()); |
| 223 | return ScopeTypeModule; |
| 224 | case SCRIPT_SCOPE: |
| 225 | DCHECK(context_->IsScriptContext() || context_->IsNativeContext()); |
| 226 | return ScopeTypeScript; |
| 227 | case WITH_SCOPE: |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 228 | DCHECK(context_->IsWithContext() || context_->IsDebugEvaluateContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 229 | return ScopeTypeWith; |
| 230 | case CATCH_SCOPE: |
| 231 | DCHECK(context_->IsCatchContext()); |
| 232 | return ScopeTypeCatch; |
| 233 | case BLOCK_SCOPE: |
| 234 | DCHECK(!scope_info->HasContext() || context_->IsBlockContext()); |
| 235 | return ScopeTypeBlock; |
| 236 | case EVAL_SCOPE: |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 237 | DCHECK(!scope_info->HasContext() || context_->IsFunctionContext()); |
| 238 | return ScopeTypeEval; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 239 | } |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 240 | UNREACHABLE(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 241 | } |
| 242 | if (context_->IsNativeContext()) { |
| 243 | DCHECK(context_->global_object()->IsJSGlobalObject()); |
| 244 | // If we are at the native context and have not yet seen script scope, |
| 245 | // fake it. |
| 246 | return seen_script_scope_ ? ScopeTypeGlobal : ScopeTypeScript; |
| 247 | } |
| 248 | if (context_->IsFunctionContext()) { |
| 249 | return ScopeTypeClosure; |
| 250 | } |
| 251 | if (context_->IsCatchContext()) { |
| 252 | return ScopeTypeCatch; |
| 253 | } |
| 254 | if (context_->IsBlockContext()) { |
| 255 | return ScopeTypeBlock; |
| 256 | } |
| 257 | if (context_->IsModuleContext()) { |
| 258 | return ScopeTypeModule; |
| 259 | } |
| 260 | if (context_->IsScriptContext()) { |
| 261 | return ScopeTypeScript; |
| 262 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 263 | DCHECK(context_->IsWithContext() || context_->IsDebugEvaluateContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 264 | return ScopeTypeWith; |
| 265 | } |
| 266 | |
| 267 | |
| 268 | MaybeHandle<JSObject> ScopeIterator::ScopeObject() { |
| 269 | DCHECK(!failed_); |
| 270 | switch (Type()) { |
| 271 | case ScopeIterator::ScopeTypeGlobal: |
| 272 | return Handle<JSObject>(CurrentContext()->global_proxy()); |
| 273 | case ScopeIterator::ScopeTypeScript: |
| 274 | return MaterializeScriptScope(); |
| 275 | case ScopeIterator::ScopeTypeLocal: |
| 276 | // Materialize the content of the local scope into a JSObject. |
| 277 | DCHECK(nested_scope_chain_.length() == 1); |
| 278 | return MaterializeLocalScope(); |
| 279 | case ScopeIterator::ScopeTypeWith: |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 280 | return WithContextExtension(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 281 | case ScopeIterator::ScopeTypeCatch: |
| 282 | return MaterializeCatchScope(); |
| 283 | case ScopeIterator::ScopeTypeClosure: |
| 284 | // Materialize the content of the closure scope into a JSObject. |
| 285 | return MaterializeClosure(); |
| 286 | case ScopeIterator::ScopeTypeBlock: |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 287 | case ScopeIterator::ScopeTypeEval: |
| 288 | return MaterializeInnerScope(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 289 | case ScopeIterator::ScopeTypeModule: |
| 290 | return MaterializeModuleScope(); |
| 291 | } |
| 292 | UNREACHABLE(); |
| 293 | return Handle<JSObject>(); |
| 294 | } |
| 295 | |
| 296 | |
| 297 | bool ScopeIterator::HasContext() { |
| 298 | ScopeType type = Type(); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 299 | if (type == ScopeTypeBlock || type == ScopeTypeLocal || |
| 300 | type == ScopeTypeEval) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 301 | if (!nested_scope_chain_.is_empty()) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 302 | return nested_scope_chain_.last().scope_info->HasContext(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 303 | } |
| 304 | } |
| 305 | return true; |
| 306 | } |
| 307 | |
| 308 | |
| 309 | bool ScopeIterator::SetVariableValue(Handle<String> variable_name, |
| 310 | Handle<Object> new_value) { |
| 311 | DCHECK(!failed_); |
| 312 | switch (Type()) { |
| 313 | case ScopeIterator::ScopeTypeGlobal: |
| 314 | break; |
| 315 | case ScopeIterator::ScopeTypeLocal: |
| 316 | return SetLocalVariableValue(variable_name, new_value); |
| 317 | case ScopeIterator::ScopeTypeWith: |
| 318 | break; |
| 319 | case ScopeIterator::ScopeTypeCatch: |
| 320 | return SetCatchVariableValue(variable_name, new_value); |
| 321 | case ScopeIterator::ScopeTypeClosure: |
| 322 | return SetClosureVariableValue(variable_name, new_value); |
| 323 | case ScopeIterator::ScopeTypeScript: |
| 324 | return SetScriptVariableValue(variable_name, new_value); |
| 325 | case ScopeIterator::ScopeTypeBlock: |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 326 | case ScopeIterator::ScopeTypeEval: |
| 327 | return SetInnerScopeVariableValue(variable_name, new_value); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 328 | case ScopeIterator::ScopeTypeModule: |
| 329 | // TODO(2399): should we implement it? |
| 330 | break; |
| 331 | } |
| 332 | return false; |
| 333 | } |
| 334 | |
| 335 | |
| 336 | Handle<ScopeInfo> ScopeIterator::CurrentScopeInfo() { |
| 337 | DCHECK(!failed_); |
| 338 | if (!nested_scope_chain_.is_empty()) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 339 | return nested_scope_chain_.last().scope_info; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 340 | } else if (context_->IsBlockContext()) { |
| 341 | return Handle<ScopeInfo>(context_->scope_info()); |
| 342 | } else if (context_->IsFunctionContext()) { |
| 343 | return Handle<ScopeInfo>(context_->closure()->shared()->scope_info()); |
| 344 | } |
| 345 | return Handle<ScopeInfo>::null(); |
| 346 | } |
| 347 | |
| 348 | |
| 349 | Handle<Context> ScopeIterator::CurrentContext() { |
| 350 | DCHECK(!failed_); |
| 351 | if (Type() == ScopeTypeGlobal || Type() == ScopeTypeScript || |
| 352 | nested_scope_chain_.is_empty()) { |
| 353 | return context_; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 354 | } else if (nested_scope_chain_.last().scope_info->HasContext()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 355 | return context_; |
| 356 | } else { |
| 357 | return Handle<Context>(); |
| 358 | } |
| 359 | } |
| 360 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 361 | Handle<StringSet> ScopeIterator::GetNonLocals() { return non_locals_; } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 362 | |
| 363 | #ifdef DEBUG |
| 364 | // Debug print of the content of the current scope. |
| 365 | void ScopeIterator::DebugPrint() { |
| 366 | OFStream os(stdout); |
| 367 | DCHECK(!failed_); |
| 368 | switch (Type()) { |
| 369 | case ScopeIterator::ScopeTypeGlobal: |
| 370 | os << "Global:\n"; |
| 371 | CurrentContext()->Print(os); |
| 372 | break; |
| 373 | |
| 374 | case ScopeIterator::ScopeTypeLocal: { |
| 375 | os << "Local:\n"; |
| 376 | GetFunction()->shared()->scope_info()->Print(); |
| 377 | if (!CurrentContext().is_null()) { |
| 378 | CurrentContext()->Print(os); |
| 379 | if (CurrentContext()->has_extension()) { |
| 380 | Handle<HeapObject> extension(CurrentContext()->extension(), isolate_); |
| 381 | if (extension->IsJSContextExtensionObject()) { |
| 382 | extension->Print(os); |
| 383 | } |
| 384 | } |
| 385 | } |
| 386 | break; |
| 387 | } |
| 388 | |
| 389 | case ScopeIterator::ScopeTypeWith: |
| 390 | os << "With:\n"; |
| 391 | CurrentContext()->extension()->Print(os); |
| 392 | break; |
| 393 | |
| 394 | case ScopeIterator::ScopeTypeCatch: |
| 395 | os << "Catch:\n"; |
| 396 | CurrentContext()->extension()->Print(os); |
| 397 | CurrentContext()->get(Context::THROWN_OBJECT_INDEX)->Print(os); |
| 398 | break; |
| 399 | |
| 400 | case ScopeIterator::ScopeTypeClosure: |
| 401 | os << "Closure:\n"; |
| 402 | CurrentContext()->Print(os); |
| 403 | if (CurrentContext()->has_extension()) { |
| 404 | Handle<HeapObject> extension(CurrentContext()->extension(), isolate_); |
| 405 | if (extension->IsJSContextExtensionObject()) { |
| 406 | extension->Print(os); |
| 407 | } |
| 408 | } |
| 409 | break; |
| 410 | |
| 411 | case ScopeIterator::ScopeTypeScript: |
| 412 | os << "Script:\n"; |
| 413 | CurrentContext() |
| 414 | ->global_object() |
| 415 | ->native_context() |
| 416 | ->script_context_table() |
| 417 | ->Print(os); |
| 418 | break; |
| 419 | |
| 420 | default: |
| 421 | UNREACHABLE(); |
| 422 | } |
| 423 | PrintF("\n"); |
| 424 | } |
| 425 | #endif |
| 426 | |
| 427 | |
| 428 | void ScopeIterator::RetrieveScopeChain(Scope* scope) { |
| 429 | if (scope != NULL) { |
| 430 | int source_position = frame_inspector_->GetSourcePosition(); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 431 | GetNestedScopeChain(isolate_, scope, source_position); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 432 | } else { |
| 433 | // A failed reparse indicates that the preparser has diverged from the |
| 434 | // parser or that the preparse data given to the initial parse has been |
| 435 | // faulty. We fail in debug mode but in release mode we only provide the |
| 436 | // information we get from the context chain but nothing about |
| 437 | // completely stack allocated scopes or stack allocated locals. |
| 438 | // Or it could be due to stack overflow. |
| 439 | DCHECK(isolate_->has_pending_exception()); |
| 440 | failed_ = true; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | |
| 445 | void ScopeIterator::CollectNonLocals(Scope* scope) { |
| 446 | if (scope != NULL) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 447 | DCHECK(non_locals_.is_null()); |
| 448 | non_locals_ = scope->CollectNonLocals(StringSet::New(isolate_)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 449 | } |
| 450 | } |
| 451 | |
| 452 | |
| 453 | MaybeHandle<JSObject> ScopeIterator::MaterializeScriptScope() { |
| 454 | Handle<JSGlobalObject> global(CurrentContext()->global_object()); |
| 455 | Handle<ScriptContextTable> script_contexts( |
| 456 | global->native_context()->script_context_table()); |
| 457 | |
| 458 | Handle<JSObject> script_scope = |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 459 | isolate_->factory()->NewJSObjectWithNullProto(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 460 | |
| 461 | for (int context_index = 0; context_index < script_contexts->used(); |
| 462 | context_index++) { |
| 463 | Handle<Context> context = |
| 464 | ScriptContextTable::GetContext(script_contexts, context_index); |
| 465 | Handle<ScopeInfo> scope_info(context->scope_info()); |
| 466 | CopyContextLocalsToScopeObject(scope_info, context, script_scope); |
| 467 | } |
| 468 | return script_scope; |
| 469 | } |
| 470 | |
| 471 | |
| 472 | MaybeHandle<JSObject> ScopeIterator::MaterializeLocalScope() { |
| 473 | Handle<JSFunction> function = GetFunction(); |
| 474 | |
| 475 | Handle<JSObject> local_scope = |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 476 | isolate_->factory()->NewJSObjectWithNullProto(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 477 | frame_inspector_->MaterializeStackLocals(local_scope, function); |
| 478 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 479 | Handle<Context> frame_context = |
| 480 | Handle<Context>::cast(frame_inspector_->GetContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 481 | |
| 482 | HandleScope scope(isolate_); |
| 483 | Handle<SharedFunctionInfo> shared(function->shared()); |
| 484 | Handle<ScopeInfo> scope_info(shared->scope_info()); |
| 485 | |
| 486 | if (!scope_info->HasContext()) return local_scope; |
| 487 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 488 | // Fill all context locals. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 489 | Handle<Context> function_context(frame_context->closure_context()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 490 | CopyContextLocalsToScopeObject(scope_info, function_context, local_scope); |
| 491 | |
| 492 | // Finally copy any properties from the function context extension. |
| 493 | // These will be variables introduced by eval. |
| 494 | if (function_context->closure() == *function && |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 495 | !function_context->IsNativeContext()) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 496 | CopyContextExtensionToScopeObject(function_context, local_scope, |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 497 | KeyCollectionMode::kIncludePrototypes); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 498 | } |
| 499 | |
| 500 | return local_scope; |
| 501 | } |
| 502 | |
| 503 | |
| 504 | // Create a plain JSObject which materializes the closure content for the |
| 505 | // context. |
| 506 | Handle<JSObject> ScopeIterator::MaterializeClosure() { |
| 507 | Handle<Context> context = CurrentContext(); |
| 508 | DCHECK(context->IsFunctionContext()); |
| 509 | |
| 510 | Handle<SharedFunctionInfo> shared(context->closure()->shared()); |
| 511 | Handle<ScopeInfo> scope_info(shared->scope_info()); |
| 512 | |
| 513 | // Allocate and initialize a JSObject with all the content of this function |
| 514 | // closure. |
| 515 | Handle<JSObject> closure_scope = |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 516 | isolate_->factory()->NewJSObjectWithNullProto(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 517 | |
| 518 | // Fill all context locals to the context extension. |
| 519 | CopyContextLocalsToScopeObject(scope_info, context, closure_scope); |
| 520 | |
| 521 | // Finally copy any properties from the function context extension. This will |
| 522 | // be variables introduced by eval. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 523 | CopyContextExtensionToScopeObject(context, closure_scope, |
| 524 | KeyCollectionMode::kOwnOnly); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 525 | |
| 526 | return closure_scope; |
| 527 | } |
| 528 | |
| 529 | |
| 530 | // Create a plain JSObject which materializes the scope for the specified |
| 531 | // catch context. |
| 532 | Handle<JSObject> ScopeIterator::MaterializeCatchScope() { |
| 533 | Handle<Context> context = CurrentContext(); |
| 534 | DCHECK(context->IsCatchContext()); |
| 535 | Handle<String> name(context->catch_name()); |
| 536 | Handle<Object> thrown_object(context->get(Context::THROWN_OBJECT_INDEX), |
| 537 | isolate_); |
| 538 | Handle<JSObject> catch_scope = |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 539 | isolate_->factory()->NewJSObjectWithNullProto(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 540 | JSObject::SetOwnPropertyIgnoreAttributes(catch_scope, name, thrown_object, |
| 541 | NONE) |
| 542 | .Check(); |
| 543 | return catch_scope; |
| 544 | } |
| 545 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 546 | // Retrieve the with-context extension object. If the extension object is |
| 547 | // a proxy, return an empty object. |
| 548 | Handle<JSObject> ScopeIterator::WithContextExtension() { |
| 549 | Handle<Context> context = CurrentContext(); |
| 550 | DCHECK(context->IsWithContext()); |
| 551 | if (context->extension_receiver()->IsJSProxy()) { |
| 552 | return isolate_->factory()->NewJSObjectWithNullProto(); |
| 553 | } |
| 554 | return handle(JSObject::cast(context->extension_receiver())); |
| 555 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 556 | |
| 557 | // Create a plain JSObject which materializes the block scope for the specified |
| 558 | // block context. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 559 | Handle<JSObject> ScopeIterator::MaterializeInnerScope() { |
| 560 | Handle<JSObject> inner_scope = |
| 561 | isolate_->factory()->NewJSObjectWithNullProto(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 562 | |
| 563 | Handle<Context> context = Handle<Context>::null(); |
| 564 | if (!nested_scope_chain_.is_empty()) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 565 | Handle<ScopeInfo> scope_info = nested_scope_chain_.last().scope_info; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 566 | frame_inspector_->MaterializeStackLocals(inner_scope, scope_info); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 567 | if (scope_info->HasContext()) context = CurrentContext(); |
| 568 | } else { |
| 569 | context = CurrentContext(); |
| 570 | } |
| 571 | |
| 572 | if (!context.is_null()) { |
| 573 | // Fill all context locals. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 574 | CopyContextLocalsToScopeObject(CurrentScopeInfo(), context, inner_scope); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 575 | CopyContextExtensionToScopeObject(context, inner_scope, |
| 576 | KeyCollectionMode::kOwnOnly); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 577 | } |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 578 | return inner_scope; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | |
| 582 | // Create a plain JSObject which materializes the module scope for the specified |
| 583 | // module context. |
| 584 | MaybeHandle<JSObject> ScopeIterator::MaterializeModuleScope() { |
| 585 | Handle<Context> context = CurrentContext(); |
| 586 | DCHECK(context->IsModuleContext()); |
| 587 | Handle<ScopeInfo> scope_info(context->scope_info()); |
| 588 | |
| 589 | // Allocate and initialize a JSObject with all the members of the debugged |
| 590 | // module. |
| 591 | Handle<JSObject> module_scope = |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 592 | isolate_->factory()->NewJSObjectWithNullProto(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 593 | |
| 594 | // Fill all context locals. |
| 595 | CopyContextLocalsToScopeObject(scope_info, context, module_scope); |
| 596 | |
| 597 | return module_scope; |
| 598 | } |
| 599 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 600 | bool ScopeIterator::SetParameterValue(Handle<ScopeInfo> scope_info, |
| 601 | JavaScriptFrame* frame, |
| 602 | Handle<String> parameter_name, |
| 603 | Handle<Object> new_value) { |
| 604 | // Setting stack locals of optimized frames is not supported. |
| 605 | if (frame->is_optimized()) return false; |
| 606 | HandleScope scope(isolate_); |
| 607 | for (int i = 0; i < scope_info->ParameterCount(); ++i) { |
| 608 | if (String::Equals(handle(scope_info->ParameterName(i)), parameter_name)) { |
| 609 | frame->SetParameterValue(i, *new_value); |
| 610 | return true; |
| 611 | } |
| 612 | } |
| 613 | return false; |
| 614 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 615 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 616 | bool ScopeIterator::SetStackVariableValue(Handle<ScopeInfo> scope_info, |
| 617 | JavaScriptFrame* frame, |
| 618 | Handle<String> variable_name, |
| 619 | Handle<Object> new_value) { |
| 620 | // Setting stack locals of optimized frames is not supported. |
| 621 | if (frame->is_optimized()) return false; |
| 622 | HandleScope scope(isolate_); |
| 623 | for (int i = 0; i < scope_info->StackLocalCount(); ++i) { |
| 624 | if (String::Equals(handle(scope_info->StackLocalName(i)), variable_name)) { |
| 625 | frame->SetExpression(scope_info->StackLocalIndex(i), *new_value); |
| 626 | return true; |
| 627 | } |
| 628 | } |
| 629 | return false; |
| 630 | } |
| 631 | |
| 632 | bool ScopeIterator::SetContextVariableValue(Handle<ScopeInfo> scope_info, |
| 633 | Handle<Context> context, |
| 634 | Handle<String> variable_name, |
| 635 | Handle<Object> new_value) { |
| 636 | HandleScope scope(isolate_); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 637 | for (int i = 0; i < scope_info->ContextLocalCount(); i++) { |
| 638 | Handle<String> next_name(scope_info->ContextLocalName(i)); |
| 639 | if (String::Equals(variable_name, next_name)) { |
| 640 | VariableMode mode; |
| 641 | InitializationFlag init_flag; |
| 642 | MaybeAssignedFlag maybe_assigned_flag; |
| 643 | int context_index = ScopeInfo::ContextSlotIndex( |
| 644 | scope_info, next_name, &mode, &init_flag, &maybe_assigned_flag); |
| 645 | context->set(context_index, *new_value); |
| 646 | return true; |
| 647 | } |
| 648 | } |
| 649 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 650 | if (context->has_extension()) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 651 | Handle<JSObject> ext(context->extension_object()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 652 | Maybe<bool> maybe = JSReceiver::HasOwnProperty(ext, variable_name); |
| 653 | DCHECK(maybe.IsJust()); |
| 654 | if (maybe.FromJust()) { |
| 655 | // We don't expect this to do anything except replacing property value. |
| 656 | JSObject::SetOwnPropertyIgnoreAttributes(ext, variable_name, new_value, |
| 657 | NONE) |
| 658 | .Check(); |
| 659 | return true; |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | return false; |
| 664 | } |
| 665 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 666 | bool ScopeIterator::SetLocalVariableValue(Handle<String> variable_name, |
| 667 | Handle<Object> new_value) { |
| 668 | JavaScriptFrame* frame = GetFrame(); |
| 669 | Handle<ScopeInfo> scope_info(frame->function()->shared()->scope_info()); |
| 670 | |
| 671 | // Parameter might be shadowed in context. Don't stop here. |
| 672 | bool result = SetParameterValue(scope_info, frame, variable_name, new_value); |
| 673 | |
| 674 | // Stack locals. |
| 675 | if (SetStackVariableValue(scope_info, frame, variable_name, new_value)) { |
| 676 | return true; |
| 677 | } |
| 678 | |
| 679 | if (scope_info->HasContext() && |
| 680 | SetContextVariableValue(scope_info, CurrentContext(), variable_name, |
| 681 | new_value)) { |
| 682 | return true; |
| 683 | } |
| 684 | |
| 685 | return result; |
| 686 | } |
| 687 | |
| 688 | bool ScopeIterator::SetInnerScopeVariableValue(Handle<String> variable_name, |
| 689 | Handle<Object> new_value) { |
| 690 | Handle<ScopeInfo> scope_info = CurrentScopeInfo(); |
| 691 | DCHECK(scope_info->scope_type() == BLOCK_SCOPE || |
| 692 | scope_info->scope_type() == EVAL_SCOPE); |
| 693 | JavaScriptFrame* frame = GetFrame(); |
| 694 | |
| 695 | // Setting stack locals of optimized frames is not supported. |
| 696 | if (SetStackVariableValue(scope_info, frame, variable_name, new_value)) { |
| 697 | return true; |
| 698 | } |
| 699 | |
| 700 | if (HasContext() && SetContextVariableValue(scope_info, CurrentContext(), |
| 701 | variable_name, new_value)) { |
| 702 | return true; |
| 703 | } |
| 704 | |
| 705 | return false; |
| 706 | } |
| 707 | |
| 708 | // This method copies structure of MaterializeClosure method above. |
| 709 | bool ScopeIterator::SetClosureVariableValue(Handle<String> variable_name, |
| 710 | Handle<Object> new_value) { |
| 711 | DCHECK(CurrentContext()->IsFunctionContext()); |
| 712 | return SetContextVariableValue(CurrentScopeInfo(), CurrentContext(), |
| 713 | variable_name, new_value); |
| 714 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 715 | |
| 716 | bool ScopeIterator::SetScriptVariableValue(Handle<String> variable_name, |
| 717 | Handle<Object> new_value) { |
| 718 | Handle<Context> context = CurrentContext(); |
| 719 | Handle<ScriptContextTable> script_contexts( |
| 720 | context->global_object()->native_context()->script_context_table()); |
| 721 | ScriptContextTable::LookupResult lookup_result; |
| 722 | if (ScriptContextTable::Lookup(script_contexts, variable_name, |
| 723 | &lookup_result)) { |
| 724 | Handle<Context> script_context = ScriptContextTable::GetContext( |
| 725 | script_contexts, lookup_result.context_index); |
| 726 | script_context->set(lookup_result.slot_index, *new_value); |
| 727 | return true; |
| 728 | } |
| 729 | |
| 730 | return false; |
| 731 | } |
| 732 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 733 | bool ScopeIterator::SetCatchVariableValue(Handle<String> variable_name, |
| 734 | Handle<Object> new_value) { |
| 735 | Handle<Context> context = CurrentContext(); |
| 736 | DCHECK(context->IsCatchContext()); |
| 737 | Handle<String> name(context->catch_name()); |
| 738 | if (!String::Equals(name, variable_name)) { |
| 739 | return false; |
| 740 | } |
| 741 | context->set(Context::THROWN_OBJECT_INDEX, *new_value); |
| 742 | return true; |
| 743 | } |
| 744 | |
| 745 | |
| 746 | void ScopeIterator::CopyContextLocalsToScopeObject( |
| 747 | Handle<ScopeInfo> scope_info, Handle<Context> context, |
| 748 | Handle<JSObject> scope_object) { |
| 749 | Isolate* isolate = scope_info->GetIsolate(); |
| 750 | int local_count = scope_info->ContextLocalCount(); |
| 751 | if (local_count == 0) return; |
| 752 | // Fill all context locals to the context extension. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 753 | for (int i = 0; i < local_count; ++i) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 754 | Handle<String> name(scope_info->ContextLocalName(i)); |
| 755 | if (ScopeInfo::VariableIsSynthetic(*name)) continue; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 756 | int context_index = Context::MIN_CONTEXT_SLOTS + i; |
| 757 | Handle<Object> value = Handle<Object>(context->get(context_index), isolate); |
| 758 | // Reflect variables under TDZ as undefined in scope object. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 759 | if (value->IsTheHole(isolate)) continue; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 760 | // This should always succeed. |
| 761 | // TODO(verwaest): Use AddDataProperty instead. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 762 | JSObject::SetOwnPropertyIgnoreAttributes(scope_object, name, value, NONE) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 763 | .Check(); |
| 764 | } |
| 765 | } |
| 766 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 767 | void ScopeIterator::CopyContextExtensionToScopeObject( |
| 768 | Handle<Context> context, Handle<JSObject> scope_object, |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 769 | KeyCollectionMode mode) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 770 | if (context->extension_object() == nullptr) return; |
| 771 | Handle<JSObject> extension(context->extension_object()); |
| 772 | Handle<FixedArray> keys = |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 773 | KeyAccumulator::GetKeys(extension, mode, ENUMERABLE_STRINGS) |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 774 | .ToHandleChecked(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 775 | |
| 776 | for (int i = 0; i < keys->length(); i++) { |
| 777 | // Names of variables introduced by eval are strings. |
| 778 | DCHECK(keys->get(i)->IsString()); |
| 779 | Handle<String> key(String::cast(keys->get(i))); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 780 | Handle<Object> value = |
| 781 | Object::GetPropertyOrElement(extension, key).ToHandleChecked(); |
| 782 | JSObject::SetOwnPropertyIgnoreAttributes(scope_object, key, value, NONE) |
| 783 | .Check(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 784 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 785 | } |
| 786 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 787 | void ScopeIterator::GetNestedScopeChain(Isolate* isolate, Scope* scope, |
| 788 | int position) { |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 789 | if (scope->is_function_scope()) { |
| 790 | // Do not collect scopes of nested inner functions inside the current one. |
| 791 | Handle<JSFunction> function = |
| 792 | Handle<JSFunction>::cast(frame_inspector_->GetFunction()); |
| 793 | if (scope->end_position() < function->shared()->end_position()) return; |
| 794 | } |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 795 | if (scope->is_hidden()) { |
| 796 | // We need to add this chain element in case the scope has a context |
| 797 | // associated. We need to keep the scope chain and context chain in sync. |
| 798 | nested_scope_chain_.Add(ExtendedScopeInfo(scope->GetScopeInfo(isolate))); |
| 799 | } else { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 800 | nested_scope_chain_.Add(ExtendedScopeInfo(scope->GetScopeInfo(isolate), |
| 801 | scope->start_position(), |
| 802 | scope->end_position())); |
| 803 | } |
| 804 | for (int i = 0; i < scope->inner_scopes()->length(); i++) { |
| 805 | Scope* inner_scope = scope->inner_scopes()->at(i); |
| 806 | int beg_pos = inner_scope->start_position(); |
| 807 | int end_pos = inner_scope->end_position(); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 808 | DCHECK((beg_pos >= 0 && end_pos >= 0) || inner_scope->is_hidden()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 809 | if (beg_pos <= position && position < end_pos) { |
| 810 | GetNestedScopeChain(isolate, inner_scope, position); |
| 811 | return; |
| 812 | } |
| 813 | } |
| 814 | } |
| 815 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 816 | } // namespace internal |
| 817 | } // namespace v8 |