| File: | out/../deps/v8/src/debug/debug.cc |
| Warning: | line 1197, column 22 Value stored to 'js_frame' during its initialization is never read |
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| 1 | // Copyright 2012 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.h" |
| 6 | |
| 7 | #include <memory> |
| 8 | #include <unordered_set> |
| 9 | |
| 10 | #include "src/api/api-inl.h" |
| 11 | #include "src/api/api-natives.h" |
| 12 | #include "src/base/platform/mutex.h" |
| 13 | #include "src/builtins/builtins.h" |
| 14 | #include "src/codegen/assembler-inl.h" |
| 15 | #include "src/codegen/compilation-cache.h" |
| 16 | #include "src/codegen/compiler.h" |
| 17 | #include "src/common/assert-scope.h" |
| 18 | #include "src/common/globals.h" |
| 19 | #include "src/common/message-template.h" |
| 20 | #include "src/debug/debug-evaluate.h" |
| 21 | #include "src/debug/liveedit.h" |
| 22 | #include "src/deoptimizer/deoptimizer.h" |
| 23 | #include "src/execution/arguments.h" |
| 24 | #include "src/execution/execution.h" |
| 25 | #include "src/execution/frames-inl.h" |
| 26 | #include "src/execution/isolate-inl.h" |
| 27 | #include "src/execution/v8threads.h" |
| 28 | #include "src/handles/global-handles-inl.h" |
| 29 | #include "src/heap/heap-inl.h" // For NextDebuggingId. |
| 30 | #include "src/init/bootstrapper.h" |
| 31 | #include "src/interpreter/bytecode-array-iterator.h" |
| 32 | #include "src/interpreter/interpreter.h" |
| 33 | #include "src/logging/counters.h" |
| 34 | #include "src/logging/runtime-call-stats-scope.h" |
| 35 | #include "src/objects/api-callbacks-inl.h" |
| 36 | #include "src/objects/debug-objects-inl.h" |
| 37 | #include "src/objects/js-generator-inl.h" |
| 38 | #include "src/objects/js-promise-inl.h" |
| 39 | #include "src/objects/slots.h" |
| 40 | #include "src/snapshot/embedded/embedded-data.h" |
| 41 | #include "src/snapshot/snapshot.h" |
| 42 | |
| 43 | #if V8_ENABLE_WEBASSEMBLY1 |
| 44 | #include "src/wasm/wasm-debug.h" |
| 45 | #include "src/wasm/wasm-objects-inl.h" |
| 46 | #endif // V8_ENABLE_WEBASSEMBLY |
| 47 | |
| 48 | namespace v8 { |
| 49 | namespace internal { |
| 50 | |
| 51 | class Debug::TemporaryObjectsTracker : public HeapObjectAllocationTracker { |
| 52 | public: |
| 53 | TemporaryObjectsTracker() = default; |
| 54 | ~TemporaryObjectsTracker() override = default; |
| 55 | TemporaryObjectsTracker(const TemporaryObjectsTracker&) = delete; |
| 56 | TemporaryObjectsTracker& operator=(const TemporaryObjectsTracker&) = delete; |
| 57 | |
| 58 | void AllocationEvent(Address addr, int) override { |
| 59 | if (disabled) return; |
| 60 | objects_.insert(addr); |
| 61 | } |
| 62 | |
| 63 | void MoveEvent(Address from, Address to, int) override { |
| 64 | if (from == to) return; |
| 65 | base::MutexGuard guard(&mutex_); |
| 66 | auto it = objects_.find(from); |
| 67 | if (it == objects_.end()) { |
| 68 | // If temporary object was collected we can get MoveEvent which moves |
| 69 | // existing non temporary object to the address where we had temporary |
| 70 | // object. So we should mark new address as non temporary. |
| 71 | objects_.erase(to); |
| 72 | return; |
| 73 | } |
| 74 | objects_.erase(it); |
| 75 | objects_.insert(to); |
| 76 | } |
| 77 | |
| 78 | bool HasObject(Handle<HeapObject> obj) const { |
| 79 | if (obj->IsJSObject() && |
| 80 | Handle<JSObject>::cast(obj)->GetEmbedderFieldCount()) { |
| 81 | // Embedder may store any pointers using embedder fields and implements |
| 82 | // non trivial logic, e.g. create wrappers lazily and store pointer to |
| 83 | // native object inside embedder field. We should consider all objects |
| 84 | // with embedder fields as non temporary. |
| 85 | return false; |
| 86 | } |
| 87 | return objects_.find(obj->address()) != objects_.end(); |
| 88 | } |
| 89 | |
| 90 | bool disabled = false; |
| 91 | |
| 92 | private: |
| 93 | std::unordered_set<Address> objects_; |
| 94 | base::Mutex mutex_; |
| 95 | }; |
| 96 | |
| 97 | Debug::Debug(Isolate* isolate) |
| 98 | : is_active_(false), |
| 99 | hook_on_function_call_(false), |
| 100 | is_suppressed_(false), |
| 101 | break_disabled_(false), |
| 102 | break_points_active_(true), |
| 103 | break_on_exception_(false), |
| 104 | break_on_uncaught_exception_(false), |
| 105 | side_effect_check_failed_(false), |
| 106 | debug_info_list_(nullptr), |
| 107 | feature_tracker_(isolate), |
| 108 | isolate_(isolate) { |
| 109 | ThreadInit(); |
| 110 | } |
| 111 | |
| 112 | Debug::~Debug() { DCHECK_NULL(debug_delegate_)((void) 0); } |
| 113 | |
| 114 | BreakLocation BreakLocation::FromFrame(Handle<DebugInfo> debug_info, |
| 115 | JavaScriptFrame* frame) { |
| 116 | if (debug_info->CanBreakAtEntry()) { |
| 117 | return BreakLocation(Debug::kBreakAtEntryPosition, DEBUG_BREAK_AT_ENTRY); |
| 118 | } |
| 119 | auto summary = FrameSummary::GetTop(frame).AsJavaScript(); |
| 120 | int offset = summary.code_offset(); |
| 121 | Handle<AbstractCode> abstract_code = summary.abstract_code(); |
| 122 | BreakIterator it(debug_info); |
| 123 | it.SkipTo(BreakIndexFromCodeOffset(debug_info, abstract_code, offset)); |
| 124 | return it.GetBreakLocation(); |
| 125 | } |
| 126 | |
| 127 | MaybeHandle<FixedArray> Debug::CheckBreakPointsForLocations( |
| 128 | Handle<DebugInfo> debug_info, std::vector<BreakLocation>& break_locations, |
| 129 | bool* has_break_points) { |
| 130 | Handle<FixedArray> break_points_hit = isolate_->factory()->NewFixedArray( |
| 131 | debug_info->GetBreakPointCount(isolate_)); |
| 132 | int break_points_hit_count = 0; |
| 133 | bool has_break_points_at_all = false; |
| 134 | for (size_t i = 0; i < break_locations.size(); i++) { |
| 135 | bool location_has_break_points; |
| 136 | MaybeHandle<FixedArray> check_result = CheckBreakPoints( |
| 137 | debug_info, &break_locations[i], &location_has_break_points); |
| 138 | has_break_points_at_all |= location_has_break_points; |
| 139 | if (!check_result.is_null()) { |
| 140 | Handle<FixedArray> break_points_current_hit = |
| 141 | check_result.ToHandleChecked(); |
| 142 | int num_objects = break_points_current_hit->length(); |
| 143 | for (int j = 0; j < num_objects; ++j) { |
| 144 | break_points_hit->set(break_points_hit_count++, |
| 145 | break_points_current_hit->get(j)); |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | *has_break_points = has_break_points_at_all; |
| 150 | if (break_points_hit_count == 0) return {}; |
| 151 | |
| 152 | break_points_hit->Shrink(isolate_, break_points_hit_count); |
| 153 | return break_points_hit; |
| 154 | } |
| 155 | |
| 156 | void BreakLocation::AllAtCurrentStatement( |
| 157 | Handle<DebugInfo> debug_info, JavaScriptFrame* frame, |
| 158 | std::vector<BreakLocation>* result_out) { |
| 159 | DCHECK(!debug_info->CanBreakAtEntry())((void) 0); |
| 160 | auto summary = FrameSummary::GetTop(frame).AsJavaScript(); |
| 161 | int offset = summary.code_offset(); |
| 162 | Handle<AbstractCode> abstract_code = summary.abstract_code(); |
| 163 | if (abstract_code->IsCode()) offset = offset - 1; |
| 164 | int statement_position; |
| 165 | { |
| 166 | BreakIterator it(debug_info); |
| 167 | it.SkipTo(BreakIndexFromCodeOffset(debug_info, abstract_code, offset)); |
| 168 | statement_position = it.statement_position(); |
| 169 | } |
| 170 | for (BreakIterator it(debug_info); !it.Done(); it.Next()) { |
| 171 | if (it.statement_position() == statement_position) { |
| 172 | result_out->push_back(it.GetBreakLocation()); |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | JSGeneratorObject BreakLocation::GetGeneratorObjectForSuspendedFrame( |
| 178 | JavaScriptFrame* frame) const { |
| 179 | DCHECK(IsSuspend())((void) 0); |
| 180 | DCHECK_GE(generator_obj_reg_index_, 0)((void) 0); |
| 181 | |
| 182 | Object generator_obj = UnoptimizedFrame::cast(frame)->ReadInterpreterRegister( |
| 183 | generator_obj_reg_index_); |
| 184 | |
| 185 | return JSGeneratorObject::cast(generator_obj); |
| 186 | } |
| 187 | |
| 188 | int BreakLocation::BreakIndexFromCodeOffset(Handle<DebugInfo> debug_info, |
| 189 | Handle<AbstractCode> abstract_code, |
| 190 | int offset) { |
| 191 | // Run through all break points to locate the one closest to the address. |
| 192 | int closest_break = 0; |
| 193 | int distance = kMaxInt; |
| 194 | DCHECK(0 <= offset && offset < abstract_code->Size())((void) 0); |
| 195 | for (BreakIterator it(debug_info); !it.Done(); it.Next()) { |
| 196 | // Check if this break point is closer that what was previously found. |
| 197 | if (it.code_offset() <= offset && offset - it.code_offset() < distance) { |
| 198 | closest_break = it.break_index(); |
| 199 | distance = offset - it.code_offset(); |
| 200 | // Check whether we can't get any closer. |
| 201 | if (distance == 0) break; |
| 202 | } |
| 203 | } |
| 204 | return closest_break; |
| 205 | } |
| 206 | |
| 207 | bool BreakLocation::HasBreakPoint(Isolate* isolate, |
| 208 | Handle<DebugInfo> debug_info) const { |
| 209 | // First check whether there is a break point with the same source position. |
| 210 | if (!debug_info->HasBreakPoint(isolate, position_)) return false; |
| 211 | if (debug_info->CanBreakAtEntry()) { |
| 212 | DCHECK_EQ(Debug::kBreakAtEntryPosition, position_)((void) 0); |
| 213 | return debug_info->BreakAtEntry(); |
| 214 | } else { |
| 215 | // Then check whether a break point at that source position would have |
| 216 | // the same code offset. Otherwise it's just a break location that we can |
| 217 | // step to, but not actually a location where we can put a break point. |
| 218 | DCHECK(abstract_code_->IsBytecodeArray())((void) 0); |
| 219 | BreakIterator it(debug_info); |
| 220 | it.SkipToPosition(position_); |
| 221 | return it.code_offset() == code_offset_; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | debug::BreakLocationType BreakLocation::type() const { |
| 226 | switch (type_) { |
| 227 | case DEBUGGER_STATEMENT: |
| 228 | return debug::kDebuggerStatementBreakLocation; |
| 229 | case DEBUG_BREAK_SLOT_AT_CALL: |
| 230 | return debug::kCallBreakLocation; |
| 231 | case DEBUG_BREAK_SLOT_AT_RETURN: |
| 232 | return debug::kReturnBreakLocation; |
| 233 | |
| 234 | // Externally, suspend breaks should look like normal breaks. |
| 235 | case DEBUG_BREAK_SLOT_AT_SUSPEND: |
| 236 | default: |
| 237 | return debug::kCommonBreakLocation; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | BreakIterator::BreakIterator(Handle<DebugInfo> debug_info) |
| 242 | : debug_info_(debug_info), |
| 243 | break_index_(-1), |
| 244 | source_position_iterator_( |
| 245 | debug_info->DebugBytecodeArray().SourcePositionTable()) { |
| 246 | position_ = debug_info->shared().StartPosition(); |
| 247 | statement_position_ = position_; |
| 248 | // There is at least one break location. |
| 249 | DCHECK(!Done())((void) 0); |
| 250 | Next(); |
| 251 | } |
| 252 | |
| 253 | int BreakIterator::BreakIndexFromPosition(int source_position) { |
| 254 | for (; !Done(); Next()) { |
| 255 | if (source_position <= position()) { |
| 256 | int first_break = break_index(); |
| 257 | for (; !Done(); Next()) { |
| 258 | if (source_position == position()) return break_index(); |
| 259 | } |
| 260 | return first_break; |
| 261 | } |
| 262 | } |
| 263 | return break_index(); |
| 264 | } |
| 265 | |
| 266 | void BreakIterator::Next() { |
| 267 | DisallowGarbageCollection no_gc; |
| 268 | DCHECK(!Done())((void) 0); |
| 269 | bool first = break_index_ == -1; |
| 270 | while (!Done()) { |
| 271 | if (!first) source_position_iterator_.Advance(); |
| 272 | first = false; |
| 273 | if (Done()) return; |
| 274 | position_ = source_position_iterator_.source_position().ScriptOffset(); |
| 275 | if (source_position_iterator_.is_statement()) { |
| 276 | statement_position_ = position_; |
| 277 | } |
| 278 | DCHECK_LE(0, position_)((void) 0); |
| 279 | DCHECK_LE(0, statement_position_)((void) 0); |
| 280 | |
| 281 | DebugBreakType type = GetDebugBreakType(); |
| 282 | if (type != NOT_DEBUG_BREAK) break; |
| 283 | } |
| 284 | break_index_++; |
| 285 | } |
| 286 | |
| 287 | DebugBreakType BreakIterator::GetDebugBreakType() { |
| 288 | BytecodeArray bytecode_array = debug_info_->OriginalBytecodeArray(); |
| 289 | interpreter::Bytecode bytecode = |
| 290 | interpreter::Bytecodes::FromByte(bytecode_array.get(code_offset())); |
| 291 | |
| 292 | // Make sure we read the actual bytecode, not a prefix scaling bytecode. |
| 293 | if (interpreter::Bytecodes::IsPrefixScalingBytecode(bytecode)) { |
| 294 | bytecode = |
| 295 | interpreter::Bytecodes::FromByte(bytecode_array.get(code_offset() + 1)); |
| 296 | } |
| 297 | |
| 298 | if (bytecode == interpreter::Bytecode::kDebugger) { |
| 299 | return DEBUGGER_STATEMENT; |
| 300 | } else if (bytecode == interpreter::Bytecode::kReturn) { |
| 301 | return DEBUG_BREAK_SLOT_AT_RETURN; |
| 302 | } else if (bytecode == interpreter::Bytecode::kSuspendGenerator) { |
| 303 | return DEBUG_BREAK_SLOT_AT_SUSPEND; |
| 304 | } else if (interpreter::Bytecodes::IsCallOrConstruct(bytecode)) { |
| 305 | return DEBUG_BREAK_SLOT_AT_CALL; |
| 306 | } else if (source_position_iterator_.is_statement()) { |
| 307 | return DEBUG_BREAK_SLOT; |
| 308 | } else { |
| 309 | return NOT_DEBUG_BREAK; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | void BreakIterator::SkipToPosition(int position) { |
| 314 | BreakIterator it(debug_info_); |
| 315 | SkipTo(it.BreakIndexFromPosition(position)); |
| 316 | } |
| 317 | |
| 318 | void BreakIterator::SetDebugBreak() { |
| 319 | DebugBreakType debug_break_type = GetDebugBreakType(); |
| 320 | if (debug_break_type == DEBUGGER_STATEMENT) return; |
| 321 | HandleScope scope(isolate()); |
| 322 | DCHECK(debug_break_type >= DEBUG_BREAK_SLOT)((void) 0); |
| 323 | Handle<BytecodeArray> bytecode_array(debug_info_->DebugBytecodeArray(), |
| 324 | isolate()); |
| 325 | interpreter::BytecodeArrayIterator(bytecode_array, code_offset()) |
| 326 | .ApplyDebugBreak(); |
| 327 | } |
| 328 | |
| 329 | void BreakIterator::ClearDebugBreak() { |
| 330 | DebugBreakType debug_break_type = GetDebugBreakType(); |
| 331 | if (debug_break_type == DEBUGGER_STATEMENT) return; |
| 332 | DCHECK(debug_break_type >= DEBUG_BREAK_SLOT)((void) 0); |
| 333 | BytecodeArray bytecode_array = debug_info_->DebugBytecodeArray(); |
| 334 | BytecodeArray original = debug_info_->OriginalBytecodeArray(); |
| 335 | bytecode_array.set(code_offset(), original.get(code_offset())); |
| 336 | } |
| 337 | |
| 338 | BreakLocation BreakIterator::GetBreakLocation() { |
| 339 | Handle<AbstractCode> code( |
| 340 | AbstractCode::cast(debug_info_->DebugBytecodeArray()), isolate()); |
| 341 | DebugBreakType type = GetDebugBreakType(); |
| 342 | int generator_object_reg_index = -1; |
| 343 | int generator_suspend_id = -1; |
| 344 | if (type == DEBUG_BREAK_SLOT_AT_SUSPEND) { |
| 345 | // For suspend break, we'll need the generator object to be able to step |
| 346 | // over the suspend as if it didn't return. We get the interpreter register |
| 347 | // index that holds the generator object by reading it directly off the |
| 348 | // bytecode array, and we'll read the actual generator object off the |
| 349 | // interpreter stack frame in GetGeneratorObjectForSuspendedFrame. |
| 350 | BytecodeArray bytecode_array = debug_info_->OriginalBytecodeArray(); |
| 351 | interpreter::BytecodeArrayIterator iterator( |
| 352 | handle(bytecode_array, isolate()), code_offset()); |
| 353 | |
| 354 | DCHECK_EQ(iterator.current_bytecode(),((void) 0) |
| 355 | interpreter::Bytecode::kSuspendGenerator)((void) 0); |
| 356 | interpreter::Register generator_obj_reg = iterator.GetRegisterOperand(0); |
| 357 | generator_object_reg_index = generator_obj_reg.index(); |
| 358 | |
| 359 | // Also memorize the suspend ID, to be able to decide whether |
| 360 | // we are paused on the implicit initial yield later. |
| 361 | generator_suspend_id = iterator.GetUnsignedImmediateOperand(3); |
| 362 | } |
| 363 | return BreakLocation(code, type, code_offset(), position_, |
| 364 | generator_object_reg_index, generator_suspend_id); |
| 365 | } |
| 366 | |
| 367 | Isolate* BreakIterator::isolate() { return debug_info_->GetIsolate(); } |
| 368 | |
| 369 | void DebugFeatureTracker::Track(DebugFeatureTracker::Feature feature) { |
| 370 | uint32_t mask = 1 << feature; |
| 371 | // Only count one sample per feature and isolate. |
| 372 | if (bitfield_ & mask) return; |
| 373 | isolate_->counters()->debug_feature_usage()->AddSample(feature); |
| 374 | bitfield_ |= mask; |
| 375 | } |
| 376 | |
| 377 | // Threading support. |
| 378 | void Debug::ThreadInit() { |
| 379 | thread_local_.break_frame_id_ = StackFrameId::NO_ID; |
| 380 | thread_local_.last_step_action_ = StepNone; |
| 381 | thread_local_.last_statement_position_ = kNoSourcePosition; |
| 382 | thread_local_.last_frame_count_ = -1; |
| 383 | thread_local_.fast_forward_to_return_ = false; |
| 384 | thread_local_.ignore_step_into_function_ = Smi::zero(); |
| 385 | thread_local_.target_frame_count_ = -1; |
| 386 | thread_local_.return_value_ = Smi::zero(); |
| 387 | thread_local_.last_breakpoint_id_ = 0; |
| 388 | clear_suspended_generator(); |
| 389 | base::Relaxed_Store(&thread_local_.current_debug_scope_, |
| 390 | static_cast<base::AtomicWord>(0)); |
| 391 | thread_local_.break_on_next_function_call_ = false; |
| 392 | UpdateHookOnFunctionCall(); |
| 393 | thread_local_.promise_stack_ = Smi::zero(); |
| 394 | } |
| 395 | |
| 396 | char* Debug::ArchiveDebug(char* storage) { |
| 397 | MemCopy(storage, reinterpret_cast<char*>(&thread_local_), |
| 398 | ArchiveSpacePerThread()); |
| 399 | return storage + ArchiveSpacePerThread(); |
| 400 | } |
| 401 | |
| 402 | char* Debug::RestoreDebug(char* storage) { |
| 403 | MemCopy(reinterpret_cast<char*>(&thread_local_), storage, |
| 404 | ArchiveSpacePerThread()); |
| 405 | |
| 406 | // Enter the debugger. |
| 407 | DebugScope debug_scope(this); |
| 408 | |
| 409 | // Clear any one-shot breakpoints that may have been set by the other |
| 410 | // thread, and reapply breakpoints for this thread. |
| 411 | ClearOneShot(); |
| 412 | |
| 413 | if (thread_local_.last_step_action_ != StepNone) { |
| 414 | int current_frame_count = CurrentFrameCount(); |
| 415 | int target_frame_count = thread_local_.target_frame_count_; |
| 416 | DCHECK(current_frame_count >= target_frame_count)((void) 0); |
| 417 | StackTraceFrameIterator frames_it(isolate_); |
| 418 | while (current_frame_count > target_frame_count) { |
| 419 | current_frame_count -= frames_it.FrameFunctionCount(); |
| 420 | frames_it.Advance(); |
| 421 | } |
| 422 | DCHECK(current_frame_count == target_frame_count)((void) 0); |
| 423 | // Set frame to what it was at Step break |
| 424 | thread_local_.break_frame_id_ = frames_it.frame()->id(); |
| 425 | |
| 426 | // Reset the previous step action for this thread. |
| 427 | PrepareStep(thread_local_.last_step_action_); |
| 428 | } |
| 429 | |
| 430 | return storage + ArchiveSpacePerThread(); |
| 431 | } |
| 432 | |
| 433 | int Debug::ArchiveSpacePerThread() { return sizeof(ThreadLocal); } |
| 434 | |
| 435 | void Debug::Iterate(RootVisitor* v) { Iterate(v, &thread_local_); } |
| 436 | |
| 437 | char* Debug::Iterate(RootVisitor* v, char* thread_storage) { |
| 438 | ThreadLocal* thread_local_data = |
| 439 | reinterpret_cast<ThreadLocal*>(thread_storage); |
| 440 | Iterate(v, thread_local_data); |
| 441 | return thread_storage + ArchiveSpacePerThread(); |
| 442 | } |
| 443 | |
| 444 | void Debug::Iterate(RootVisitor* v, ThreadLocal* thread_local_data) { |
| 445 | v->VisitRootPointer(Root::kDebug, nullptr, |
| 446 | FullObjectSlot(&thread_local_data->return_value_)); |
| 447 | v->VisitRootPointer(Root::kDebug, nullptr, |
| 448 | FullObjectSlot(&thread_local_data->suspended_generator_)); |
| 449 | v->VisitRootPointer( |
| 450 | Root::kDebug, nullptr, |
| 451 | FullObjectSlot(&thread_local_data->ignore_step_into_function_)); |
| 452 | v->VisitRootPointer(Root::kDebug, nullptr, |
| 453 | FullObjectSlot(&thread_local_data->promise_stack_)); |
| 454 | } |
| 455 | |
| 456 | DebugInfoListNode::DebugInfoListNode(Isolate* isolate, DebugInfo debug_info) |
| 457 | : next_(nullptr) { |
| 458 | // Globalize the request debug info object and make it weak. |
| 459 | GlobalHandles* global_handles = isolate->global_handles(); |
| 460 | debug_info_ = global_handles->Create(debug_info).location(); |
| 461 | } |
| 462 | |
| 463 | DebugInfoListNode::~DebugInfoListNode() { |
| 464 | if (debug_info_ == nullptr) return; |
| 465 | GlobalHandles::Destroy(debug_info_); |
| 466 | debug_info_ = nullptr; |
| 467 | } |
| 468 | |
| 469 | void Debug::Unload() { |
| 470 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 471 | ClearAllBreakPoints(); |
| 472 | ClearStepping(); |
| 473 | RemoveAllCoverageInfos(); |
| 474 | ClearAllDebuggerHints(); |
| 475 | debug_delegate_ = nullptr; |
| 476 | } |
| 477 | |
| 478 | void Debug::OnInstrumentationBreak() { |
| 479 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 480 | if (!debug_delegate_) return; |
| 481 | DCHECK(in_debug_scope())((void) 0); |
| 482 | HandleScope scope(isolate_); |
| 483 | DisableBreak no_recursive_break(this); |
| 484 | |
| 485 | Handle<Context> native_context(isolate_->native_context()); |
| 486 | debug_delegate_->BreakOnInstrumentation(v8::Utils::ToLocal(native_context), |
| 487 | kInstrumentationId); |
| 488 | } |
| 489 | |
| 490 | void Debug::Break(JavaScriptFrame* frame, Handle<JSFunction> break_target) { |
| 491 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 492 | // Just continue if breaks are disabled or debugger cannot be loaded. |
| 493 | if (break_disabled()) return; |
| 494 | |
| 495 | // Enter the debugger. |
| 496 | DebugScope debug_scope(this); |
| 497 | DisableBreak no_recursive_break(this); |
| 498 | |
| 499 | // Return if we fail to retrieve debug info. |
| 500 | Handle<SharedFunctionInfo> shared(break_target->shared(), isolate_); |
| 501 | if (!EnsureBreakInfo(shared)) return; |
| 502 | PrepareFunctionForDebugExecution(shared); |
| 503 | |
| 504 | Handle<DebugInfo> debug_info(shared->GetDebugInfo(), isolate_); |
| 505 | |
| 506 | // Find the break location where execution has stopped. |
| 507 | BreakLocation location = BreakLocation::FromFrame(debug_info, frame); |
| 508 | const bool hitInstrumentationBreak = |
| 509 | IsBreakOnInstrumentation(debug_info, location); |
| 510 | if (hitInstrumentationBreak) { |
| 511 | OnInstrumentationBreak(); |
| 512 | } |
| 513 | |
| 514 | // Find actual break points, if any, and trigger debug break event. |
| 515 | bool has_break_points; |
| 516 | MaybeHandle<FixedArray> break_points_hit = |
| 517 | CheckBreakPoints(debug_info, &location, &has_break_points); |
| 518 | if (!break_points_hit.is_null() || break_on_next_function_call()) { |
| 519 | StepAction lastStepAction = last_step_action(); |
| 520 | // Clear all current stepping setup. |
| 521 | ClearStepping(); |
| 522 | // Notify the debug event listeners. |
| 523 | OnDebugBreak(!break_points_hit.is_null() |
| 524 | ? break_points_hit.ToHandleChecked() |
| 525 | : isolate_->factory()->empty_fixed_array(), |
| 526 | lastStepAction); |
| 527 | return; |
| 528 | } |
| 529 | |
| 530 | // Debug break at function entry, do not worry about stepping. |
| 531 | if (location.IsDebugBreakAtEntry()) { |
| 532 | DCHECK(debug_info->BreakAtEntry())((void) 0); |
| 533 | return; |
| 534 | } |
| 535 | |
| 536 | DCHECK_NOT_NULL(frame)((void) 0); |
| 537 | |
| 538 | // No break point. Check for stepping. |
| 539 | StepAction step_action = last_step_action(); |
| 540 | int current_frame_count = CurrentFrameCount(); |
| 541 | int target_frame_count = thread_local_.target_frame_count_; |
| 542 | int last_frame_count = thread_local_.last_frame_count_; |
| 543 | |
| 544 | // StepOut at not return position was requested and return break locations |
| 545 | // were flooded with one shots. |
| 546 | if (thread_local_.fast_forward_to_return_) { |
| 547 | // We might hit an instrumentation breakpoint before running into a |
| 548 | // return/suspend location. |
| 549 | DCHECK(location.IsReturnOrSuspend() || hitInstrumentationBreak)((void) 0); |
| 550 | // We have to ignore recursive calls to function. |
| 551 | if (current_frame_count > target_frame_count) return; |
| 552 | ClearStepping(); |
| 553 | PrepareStep(StepOut); |
| 554 | return; |
| 555 | } |
| 556 | |
| 557 | bool step_break = false; |
| 558 | switch (step_action) { |
| 559 | case StepNone: |
| 560 | return; |
| 561 | case StepOut: |
| 562 | // StepOut should not break in a deeper frame than target frame. |
| 563 | if (current_frame_count > target_frame_count) return; |
| 564 | step_break = true; |
| 565 | break; |
| 566 | case StepOver: |
| 567 | // StepOver should not break in a deeper frame than target frame. |
| 568 | if (current_frame_count > target_frame_count) return; |
| 569 | V8_FALLTHROUGH[[clang::fallthrough]]; |
| 570 | case StepInto: { |
| 571 | // Special case StepInto and StepOver for generators that are about to |
| 572 | // suspend, in which case we go into "generator stepping" mode. The |
| 573 | // exception here is the initial implicit yield in generators (which |
| 574 | // always has a suspend ID of 0), where we return to the caller first, |
| 575 | // instead of triggering "generator stepping" mode straight away. |
| 576 | if (location.IsSuspend() && (!IsGeneratorFunction(shared->kind()) || |
| 577 | location.generator_suspend_id() > 0)) { |
| 578 | DCHECK(!has_suspended_generator())((void) 0); |
| 579 | thread_local_.suspended_generator_ = |
| 580 | location.GetGeneratorObjectForSuspendedFrame(frame); |
| 581 | ClearStepping(); |
| 582 | return; |
| 583 | } |
| 584 | |
| 585 | FrameSummary summary = FrameSummary::GetTop(frame); |
| 586 | step_break = step_break || location.IsReturn() || |
| 587 | current_frame_count != last_frame_count || |
| 588 | thread_local_.last_statement_position_ != |
| 589 | summary.SourceStatementPosition(); |
| 590 | break; |
| 591 | } |
| 592 | } |
| 593 | |
| 594 | StepAction lastStepAction = last_step_action(); |
| 595 | // Clear all current stepping setup. |
| 596 | ClearStepping(); |
| 597 | |
| 598 | if (step_break) { |
| 599 | // Notify the debug event listeners. |
| 600 | OnDebugBreak(isolate_->factory()->empty_fixed_array(), lastStepAction); |
| 601 | } else { |
| 602 | // Re-prepare to continue. |
| 603 | PrepareStep(step_action); |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | bool Debug::IsBreakOnInstrumentation(Handle<DebugInfo> debug_info, |
| 608 | const BreakLocation& location) { |
| 609 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 610 | bool has_break_points_to_check = |
| 611 | break_points_active_ && location.HasBreakPoint(isolate_, debug_info); |
| 612 | if (!has_break_points_to_check) return {}; |
| 613 | |
| 614 | Handle<Object> break_points = |
| 615 | debug_info->GetBreakPoints(isolate_, location.position()); |
| 616 | DCHECK(!break_points->IsUndefined(isolate_))((void) 0); |
| 617 | if (!break_points->IsFixedArray()) { |
| 618 | const Handle<BreakPoint> break_point = |
| 619 | Handle<BreakPoint>::cast(break_points); |
| 620 | return break_point->id() == kInstrumentationId; |
| 621 | } |
| 622 | |
| 623 | Handle<FixedArray> array(FixedArray::cast(*break_points), isolate_); |
| 624 | for (int i = 0; i < array->length(); ++i) { |
| 625 | const Handle<BreakPoint> break_point = |
| 626 | Handle<BreakPoint>::cast(handle(array->get(i), isolate_)); |
| 627 | if (break_point->id() == kInstrumentationId) { |
| 628 | return true; |
| 629 | } |
| 630 | } |
| 631 | return false; |
| 632 | } |
| 633 | |
| 634 | // Find break point objects for this location, if any, and evaluate them. |
| 635 | // Return an array of break point objects that evaluated true, or an empty |
| 636 | // handle if none evaluated true. |
| 637 | // has_break_points will be true, if there is any (non-instrumentation) |
| 638 | // breakpoint. |
| 639 | MaybeHandle<FixedArray> Debug::CheckBreakPoints(Handle<DebugInfo> debug_info, |
| 640 | BreakLocation* location, |
| 641 | bool* has_break_points) { |
| 642 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 643 | bool has_break_points_to_check = |
| 644 | break_points_active_ && location->HasBreakPoint(isolate_, debug_info); |
| 645 | if (!has_break_points_to_check) { |
| 646 | *has_break_points = false; |
| 647 | return {}; |
| 648 | } |
| 649 | |
| 650 | return Debug::GetHitBreakPoints(debug_info, location->position(), |
| 651 | has_break_points); |
| 652 | } |
| 653 | |
| 654 | bool Debug::IsMutedAtCurrentLocation(JavaScriptFrame* frame) { |
| 655 | // A break location is considered muted if break locations on the current |
| 656 | // statement have at least one break point, and all of these break points |
| 657 | // evaluate to false. Aside from not triggering a debug break event at the |
| 658 | // break location, we also do not trigger one for debugger statements, nor |
| 659 | // an exception event on exception at this location. |
| 660 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 661 | HandleScope scope(isolate_); |
| 662 | bool has_break_points; |
| 663 | MaybeHandle<FixedArray> checked = |
| 664 | GetHitBreakpointsAtCurrentStatement(frame, &has_break_points); |
| 665 | return has_break_points && checked.is_null(); |
| 666 | } |
| 667 | |
| 668 | MaybeHandle<FixedArray> Debug::GetHitBreakpointsAtCurrentStatement( |
| 669 | JavaScriptFrame* frame, bool* has_break_points) { |
| 670 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 671 | FrameSummary summary = FrameSummary::GetTop(frame); |
| 672 | Handle<JSFunction> function = summary.AsJavaScript().function(); |
| 673 | if (!function->shared().HasBreakInfo()) { |
| 674 | *has_break_points = false; |
| 675 | return {}; |
| 676 | } |
| 677 | Handle<DebugInfo> debug_info(function->shared().GetDebugInfo(), isolate_); |
| 678 | // Enter the debugger. |
| 679 | DebugScope debug_scope(this); |
| 680 | std::vector<BreakLocation> break_locations; |
| 681 | BreakLocation::AllAtCurrentStatement(debug_info, frame, &break_locations); |
| 682 | return CheckBreakPointsForLocations(debug_info, break_locations, |
| 683 | has_break_points); |
| 684 | } |
| 685 | |
| 686 | // Check whether a single break point object is triggered. |
| 687 | bool Debug::CheckBreakPoint(Handle<BreakPoint> break_point, |
| 688 | bool is_break_at_entry) { |
| 689 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 690 | HandleScope scope(isolate_); |
| 691 | |
| 692 | // Instrumentation breakpoints are handled separately. |
| 693 | if (break_point->id() == kInstrumentationId) { |
| 694 | return false; |
| 695 | } |
| 696 | |
| 697 | if (!break_point->condition().length()) return true; |
| 698 | Handle<String> condition(break_point->condition(), isolate_); |
| 699 | MaybeHandle<Object> maybe_result; |
| 700 | Handle<Object> result; |
| 701 | |
| 702 | if (is_break_at_entry) { |
| 703 | maybe_result = DebugEvaluate::WithTopmostArguments(isolate_, condition); |
| 704 | } else { |
| 705 | // Since we call CheckBreakpoint only for deoptimized frame on top of stack, |
| 706 | // we can use 0 as index of inlined frame. |
| 707 | const int inlined_jsframe_index = 0; |
| 708 | const bool throw_on_side_effect = false; |
| 709 | maybe_result = |
| 710 | DebugEvaluate::Local(isolate_, break_frame_id(), inlined_jsframe_index, |
| 711 | condition, throw_on_side_effect); |
| 712 | } |
| 713 | |
| 714 | if (!maybe_result.ToHandle(&result)) { |
| 715 | if (isolate_->has_pending_exception()) { |
| 716 | isolate_->clear_pending_exception(); |
| 717 | } |
| 718 | return false; |
| 719 | } |
| 720 | return result->BooleanValue(isolate_); |
| 721 | } |
| 722 | |
| 723 | bool Debug::SetBreakpoint(Handle<SharedFunctionInfo> shared, |
| 724 | Handle<BreakPoint> break_point, |
| 725 | int* source_position) { |
| 726 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 727 | HandleScope scope(isolate_); |
| 728 | |
| 729 | // Make sure the function is compiled and has set up the debug info. |
| 730 | if (!EnsureBreakInfo(shared)) return false; |
| 731 | PrepareFunctionForDebugExecution(shared); |
| 732 | |
| 733 | Handle<DebugInfo> debug_info(shared->GetDebugInfo(), isolate_); |
| 734 | // Source positions starts with zero. |
| 735 | DCHECK_LE(0, *source_position)((void) 0); |
| 736 | |
| 737 | // Find the break point and change it. |
| 738 | *source_position = FindBreakablePosition(debug_info, *source_position); |
| 739 | DebugInfo::SetBreakPoint(isolate_, debug_info, *source_position, break_point); |
| 740 | // At least one active break point now. |
| 741 | DCHECK_LT(0, debug_info->GetBreakPointCount(isolate_))((void) 0); |
| 742 | |
| 743 | ClearBreakPoints(debug_info); |
| 744 | ApplyBreakPoints(debug_info); |
| 745 | |
| 746 | feature_tracker()->Track(DebugFeatureTracker::kBreakPoint); |
| 747 | return true; |
| 748 | } |
| 749 | |
| 750 | bool Debug::SetBreakPointForScript(Handle<Script> script, |
| 751 | Handle<String> condition, |
| 752 | int* source_position, int* id) { |
| 753 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 754 | *id = ++thread_local_.last_breakpoint_id_; |
| 755 | Handle<BreakPoint> break_point = |
| 756 | isolate_->factory()->NewBreakPoint(*id, condition); |
| 757 | #if V8_ENABLE_WEBASSEMBLY1 |
| 758 | if (script->type() == Script::TYPE_WASM) { |
| 759 | RecordWasmScriptWithBreakpoints(script); |
| 760 | return WasmScript::SetBreakPoint(script, source_position, break_point); |
| 761 | } |
| 762 | #endif // V8_ENABLE_WEBASSEMBLY |
| 763 | |
| 764 | HandleScope scope(isolate_); |
| 765 | |
| 766 | // Obtain shared function info for the innermost function containing this |
| 767 | // position. |
| 768 | Handle<Object> result = |
| 769 | FindInnermostContainingFunctionInfo(script, *source_position); |
| 770 | if (result->IsUndefined(isolate_)) return false; |
| 771 | |
| 772 | auto shared = Handle<SharedFunctionInfo>::cast(result); |
| 773 | if (!EnsureBreakInfo(shared)) return false; |
| 774 | PrepareFunctionForDebugExecution(shared); |
| 775 | |
| 776 | // Find the nested shared function info that is closest to the position within |
| 777 | // the containing function. |
| 778 | shared = FindClosestSharedFunctionInfoFromPosition(*source_position, script, |
| 779 | shared); |
| 780 | |
| 781 | // Set the breakpoint in the function. |
| 782 | return SetBreakpoint(shared, break_point, source_position); |
| 783 | } |
| 784 | |
| 785 | int Debug::FindBreakablePosition(Handle<DebugInfo> debug_info, |
| 786 | int source_position) { |
| 787 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 788 | if (debug_info->CanBreakAtEntry()) { |
| 789 | return kBreakAtEntryPosition; |
| 790 | } else { |
| 791 | DCHECK(debug_info->HasInstrumentedBytecodeArray())((void) 0); |
| 792 | BreakIterator it(debug_info); |
| 793 | it.SkipToPosition(source_position); |
| 794 | return it.position(); |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | void Debug::ApplyBreakPoints(Handle<DebugInfo> debug_info) { |
| 799 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 800 | DisallowGarbageCollection no_gc; |
| 801 | if (debug_info->CanBreakAtEntry()) { |
| 802 | debug_info->SetBreakAtEntry(); |
| 803 | } else { |
| 804 | if (!debug_info->HasInstrumentedBytecodeArray()) return; |
| 805 | FixedArray break_points = debug_info->break_points(); |
| 806 | for (int i = 0; i < break_points.length(); i++) { |
| 807 | if (break_points.get(i).IsUndefined(isolate_)) continue; |
| 808 | BreakPointInfo info = BreakPointInfo::cast(break_points.get(i)); |
| 809 | if (info.GetBreakPointCount(isolate_) == 0) continue; |
| 810 | DCHECK(debug_info->HasInstrumentedBytecodeArray())((void) 0); |
| 811 | BreakIterator it(debug_info); |
| 812 | it.SkipToPosition(info.source_position()); |
| 813 | it.SetDebugBreak(); |
| 814 | } |
| 815 | } |
| 816 | debug_info->SetDebugExecutionMode(DebugInfo::kBreakpoints); |
| 817 | } |
| 818 | |
| 819 | void Debug::ClearBreakPoints(Handle<DebugInfo> debug_info) { |
| 820 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 821 | if (debug_info->CanBreakAtEntry()) { |
| 822 | debug_info->ClearBreakAtEntry(); |
| 823 | } else { |
| 824 | // If we attempt to clear breakpoints but none exist, simply return. This |
| 825 | // can happen e.g. CoverageInfos exist but no breakpoints are set. |
| 826 | if (!debug_info->HasInstrumentedBytecodeArray() || |
| 827 | !debug_info->HasBreakInfo()) { |
| 828 | return; |
| 829 | } |
| 830 | |
| 831 | DisallowGarbageCollection no_gc; |
| 832 | for (BreakIterator it(debug_info); !it.Done(); it.Next()) { |
| 833 | it.ClearDebugBreak(); |
| 834 | } |
| 835 | } |
| 836 | } |
| 837 | |
| 838 | void Debug::ClearBreakPoint(Handle<BreakPoint> break_point) { |
| 839 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 840 | HandleScope scope(isolate_); |
| 841 | |
| 842 | for (DebugInfoListNode* node = debug_info_list_; node != nullptr; |
| 843 | node = node->next()) { |
| 844 | if (!node->debug_info()->HasBreakInfo()) continue; |
| 845 | Handle<Object> result = DebugInfo::FindBreakPointInfo( |
| 846 | isolate_, node->debug_info(), break_point); |
| 847 | if (result->IsUndefined(isolate_)) continue; |
| 848 | Handle<DebugInfo> debug_info = node->debug_info(); |
| 849 | if (DebugInfo::ClearBreakPoint(isolate_, debug_info, break_point)) { |
| 850 | ClearBreakPoints(debug_info); |
| 851 | if (debug_info->GetBreakPointCount(isolate_) == 0) { |
| 852 | RemoveBreakInfoAndMaybeFree(debug_info); |
| 853 | } else { |
| 854 | ApplyBreakPoints(debug_info); |
| 855 | } |
| 856 | return; |
| 857 | } |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | int Debug::GetFunctionDebuggingId(Handle<JSFunction> function) { |
| 862 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 863 | Handle<SharedFunctionInfo> shared = handle(function->shared(), isolate_); |
| 864 | Handle<DebugInfo> debug_info = GetOrCreateDebugInfo(shared); |
| 865 | int id = debug_info->debugging_id(); |
| 866 | if (id == DebugInfo::kNoDebuggingId) { |
| 867 | id = isolate_->heap()->NextDebuggingId(); |
| 868 | debug_info->set_debugging_id(id); |
| 869 | } |
| 870 | return id; |
| 871 | } |
| 872 | |
| 873 | bool Debug::SetBreakpointForFunction(Handle<SharedFunctionInfo> shared, |
| 874 | Handle<String> condition, int* id, |
| 875 | BreakPointKind kind) { |
| 876 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 877 | if (kind == kInstrumentation) { |
| 878 | *id = kInstrumentationId; |
| 879 | } else { |
| 880 | *id = ++thread_local_.last_breakpoint_id_; |
| 881 | } |
| 882 | Handle<BreakPoint> breakpoint = |
| 883 | isolate_->factory()->NewBreakPoint(*id, condition); |
| 884 | int source_position = 0; |
| 885 | #if V8_ENABLE_WEBASSEMBLY1 |
| 886 | // Handle wasm function. |
| 887 | if (shared->HasWasmExportedFunctionData()) { |
| 888 | int func_index = shared->wasm_exported_function_data().function_index(); |
| 889 | Handle<WasmInstanceObject> wasm_instance( |
| 890 | shared->wasm_exported_function_data().instance(), isolate_); |
| 891 | Handle<Script> script(Script::cast(wasm_instance->module_object().script()), |
| 892 | isolate_); |
| 893 | return WasmScript::SetBreakPointOnFirstBreakableForFunction( |
| 894 | script, func_index, breakpoint); |
| 895 | } |
| 896 | #endif // V8_ENABLE_WEBASSEMBLY |
| 897 | return SetBreakpoint(shared, breakpoint, &source_position); |
| 898 | } |
| 899 | |
| 900 | void Debug::RemoveBreakpoint(int id) { |
| 901 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 902 | Handle<BreakPoint> breakpoint = isolate_->factory()->NewBreakPoint( |
| 903 | id, isolate_->factory()->empty_string()); |
| 904 | ClearBreakPoint(breakpoint); |
| 905 | } |
| 906 | |
| 907 | #if V8_ENABLE_WEBASSEMBLY1 |
| 908 | void Debug::SetInstrumentationBreakpointForWasmScript(Handle<Script> script, |
| 909 | int* id) { |
| 910 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 911 | DCHECK_EQ(Script::TYPE_WASM, script->type())((void) 0); |
| 912 | *id = kInstrumentationId; |
| 913 | |
| 914 | Handle<BreakPoint> break_point = isolate_->factory()->NewBreakPoint( |
| 915 | *id, isolate_->factory()->empty_string()); |
| 916 | RecordWasmScriptWithBreakpoints(script); |
| 917 | WasmScript::SetInstrumentationBreakpoint(script, break_point); |
| 918 | } |
| 919 | |
| 920 | void Debug::RemoveBreakpointForWasmScript(Handle<Script> script, int id) { |
| 921 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 922 | if (script->type() == Script::TYPE_WASM) { |
| 923 | WasmScript::ClearBreakPointById(script, id); |
| 924 | } |
| 925 | } |
| 926 | |
| 927 | void Debug::RecordWasmScriptWithBreakpoints(Handle<Script> script) { |
| 928 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 929 | if (wasm_scripts_with_break_points_.is_null()) { |
| 930 | Handle<WeakArrayList> new_list = isolate_->factory()->NewWeakArrayList(4); |
| 931 | wasm_scripts_with_break_points_ = |
| 932 | isolate_->global_handles()->Create(*new_list); |
| 933 | } |
| 934 | { |
| 935 | DisallowGarbageCollection no_gc; |
| 936 | for (int idx = wasm_scripts_with_break_points_->length() - 1; idx >= 0; |
| 937 | --idx) { |
| 938 | HeapObject wasm_script; |
| 939 | if (wasm_scripts_with_break_points_->Get(idx).GetHeapObject( |
| 940 | &wasm_script) && |
| 941 | wasm_script == *script) { |
| 942 | return; |
| 943 | } |
| 944 | } |
| 945 | } |
| 946 | Handle<WeakArrayList> new_list = WeakArrayList::Append( |
| 947 | isolate_, wasm_scripts_with_break_points_, MaybeObjectHandle{script}); |
| 948 | if (*new_list != *wasm_scripts_with_break_points_) { |
| 949 | isolate_->global_handles()->Destroy( |
| 950 | wasm_scripts_with_break_points_.location()); |
| 951 | wasm_scripts_with_break_points_ = |
| 952 | isolate_->global_handles()->Create(*new_list); |
| 953 | } |
| 954 | } |
| 955 | #endif // V8_ENABLE_WEBASSEMBLY |
| 956 | |
| 957 | // Clear out all the debug break code. |
| 958 | void Debug::ClearAllBreakPoints() { |
| 959 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 960 | ClearAllDebugInfos([=](Handle<DebugInfo> info) { |
| 961 | ClearBreakPoints(info); |
| 962 | info->ClearBreakInfo(isolate_); |
| 963 | }); |
| 964 | #if V8_ENABLE_WEBASSEMBLY1 |
| 965 | // Clear all wasm breakpoints. |
| 966 | if (!wasm_scripts_with_break_points_.is_null()) { |
| 967 | DisallowGarbageCollection no_gc; |
| 968 | for (int idx = wasm_scripts_with_break_points_->length() - 1; idx >= 0; |
| 969 | --idx) { |
| 970 | HeapObject raw_wasm_script; |
| 971 | if (wasm_scripts_with_break_points_->Get(idx).GetHeapObject( |
| 972 | &raw_wasm_script)) { |
| 973 | Script wasm_script = Script::cast(raw_wasm_script); |
| 974 | WasmScript::ClearAllBreakpoints(wasm_script); |
| 975 | wasm_script.wasm_native_module()->GetDebugInfo()->RemoveIsolate( |
| 976 | isolate_); |
| 977 | } |
| 978 | } |
| 979 | wasm_scripts_with_break_points_ = Handle<WeakArrayList>{}; |
| 980 | } |
| 981 | #endif // V8_ENABLE_WEBASSEMBLY |
| 982 | } |
| 983 | |
| 984 | void Debug::FloodWithOneShot(Handle<SharedFunctionInfo> shared, |
| 985 | bool returns_only) { |
| 986 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 987 | if (IsBlackboxed(shared)) return; |
| 988 | // Make sure the function is compiled and has set up the debug info. |
| 989 | if (!EnsureBreakInfo(shared)) return; |
| 990 | PrepareFunctionForDebugExecution(shared); |
| 991 | |
| 992 | Handle<DebugInfo> debug_info(shared->GetDebugInfo(), isolate_); |
| 993 | // Flood the function with break points. |
| 994 | DCHECK(debug_info->HasInstrumentedBytecodeArray())((void) 0); |
| 995 | for (BreakIterator it(debug_info); !it.Done(); it.Next()) { |
| 996 | if (returns_only && !it.GetBreakLocation().IsReturnOrSuspend()) continue; |
| 997 | it.SetDebugBreak(); |
| 998 | } |
| 999 | } |
| 1000 | |
| 1001 | void Debug::ChangeBreakOnException(ExceptionBreakType type, bool enable) { |
| 1002 | if (type == BreakUncaughtException) { |
| 1003 | break_on_uncaught_exception_ = enable; |
| 1004 | } else { |
| 1005 | break_on_exception_ = enable; |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | bool Debug::IsBreakOnException(ExceptionBreakType type) { |
| 1010 | if (type == BreakUncaughtException) { |
| 1011 | return break_on_uncaught_exception_; |
| 1012 | } else { |
| 1013 | return break_on_exception_; |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | MaybeHandle<FixedArray> Debug::GetHitBreakPoints(Handle<DebugInfo> debug_info, |
| 1018 | int position, |
| 1019 | bool* has_break_points) { |
| 1020 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1021 | Handle<Object> break_points = debug_info->GetBreakPoints(isolate_, position); |
| 1022 | bool is_break_at_entry = debug_info->BreakAtEntry(); |
| 1023 | DCHECK(!break_points->IsUndefined(isolate_))((void) 0); |
| 1024 | if (!break_points->IsFixedArray()) { |
| 1025 | const Handle<BreakPoint> break_point = |
| 1026 | Handle<BreakPoint>::cast(break_points); |
| 1027 | *has_break_points = break_point->id() != kInstrumentationId; |
| 1028 | if (!CheckBreakPoint(break_point, is_break_at_entry)) { |
| 1029 | return {}; |
| 1030 | } |
| 1031 | Handle<FixedArray> break_points_hit = isolate_->factory()->NewFixedArray(1); |
| 1032 | break_points_hit->set(0, *break_points); |
| 1033 | return break_points_hit; |
| 1034 | } |
| 1035 | |
| 1036 | Handle<FixedArray> array(FixedArray::cast(*break_points), isolate_); |
| 1037 | int num_objects = array->length(); |
| 1038 | Handle<FixedArray> break_points_hit = |
| 1039 | isolate_->factory()->NewFixedArray(num_objects); |
| 1040 | int break_points_hit_count = 0; |
| 1041 | *has_break_points = false; |
| 1042 | for (int i = 0; i < num_objects; ++i) { |
| 1043 | Handle<BreakPoint> break_point = |
| 1044 | Handle<BreakPoint>::cast(handle(array->get(i), isolate_)); |
| 1045 | *has_break_points |= break_point->id() != kInstrumentationId; |
| 1046 | if (CheckBreakPoint(break_point, is_break_at_entry)) { |
| 1047 | break_points_hit->set(break_points_hit_count++, *break_point); |
| 1048 | } |
| 1049 | } |
| 1050 | if (break_points_hit_count == 0) return {}; |
| 1051 | break_points_hit->Shrink(isolate_, break_points_hit_count); |
| 1052 | return break_points_hit; |
| 1053 | } |
| 1054 | |
| 1055 | void Debug::SetBreakOnNextFunctionCall() { |
| 1056 | // This method forces V8 to break on next function call regardless current |
| 1057 | // last_step_action_. If any break happens between SetBreakOnNextFunctionCall |
| 1058 | // and ClearBreakOnNextFunctionCall, we will clear this flag and stepping. If |
| 1059 | // break does not happen, e.g. all called functions are blackboxed or no |
| 1060 | // function is called, then we will clear this flag and let stepping continue |
| 1061 | // its normal business. |
| 1062 | thread_local_.break_on_next_function_call_ = true; |
| 1063 | UpdateHookOnFunctionCall(); |
| 1064 | } |
| 1065 | |
| 1066 | void Debug::ClearBreakOnNextFunctionCall() { |
| 1067 | thread_local_.break_on_next_function_call_ = false; |
| 1068 | UpdateHookOnFunctionCall(); |
| 1069 | } |
| 1070 | |
| 1071 | void Debug::PrepareStepIn(Handle<JSFunction> function) { |
| 1072 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1073 | CHECK(last_step_action() >= StepInto || break_on_next_function_call())do { if ((__builtin_expect(!!(!(last_step_action() >= StepInto || break_on_next_function_call())), 0))) { V8_Fatal("Check failed: %s." , "last_step_action() >= StepInto || break_on_next_function_call()" ); } } while (false); |
| 1074 | if (ignore_events()) return; |
| 1075 | if (in_debug_scope()) return; |
| 1076 | if (break_disabled()) return; |
| 1077 | Handle<SharedFunctionInfo> shared(function->shared(), isolate_); |
| 1078 | if (IsBlackboxed(shared)) return; |
| 1079 | if (*function == thread_local_.ignore_step_into_function_) return; |
| 1080 | thread_local_.ignore_step_into_function_ = Smi::zero(); |
| 1081 | FloodWithOneShot(Handle<SharedFunctionInfo>(function->shared(), isolate_)); |
| 1082 | } |
| 1083 | |
| 1084 | void Debug::PrepareStepInSuspendedGenerator() { |
| 1085 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1086 | CHECK(has_suspended_generator())do { if ((__builtin_expect(!!(!(has_suspended_generator())), 0 ))) { V8_Fatal("Check failed: %s.", "has_suspended_generator()" ); } } while (false); |
| 1087 | if (ignore_events()) return; |
| 1088 | if (in_debug_scope()) return; |
| 1089 | if (break_disabled()) return; |
| 1090 | thread_local_.last_step_action_ = StepInto; |
| 1091 | UpdateHookOnFunctionCall(); |
| 1092 | Handle<JSFunction> function( |
| 1093 | JSGeneratorObject::cast(thread_local_.suspended_generator_).function(), |
| 1094 | isolate_); |
| 1095 | FloodWithOneShot(Handle<SharedFunctionInfo>(function->shared(), isolate_)); |
| 1096 | clear_suspended_generator(); |
| 1097 | } |
| 1098 | |
| 1099 | void Debug::PrepareStepOnThrow() { |
| 1100 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1101 | if (last_step_action() == StepNone) return; |
| 1102 | if (ignore_events()) return; |
| 1103 | if (in_debug_scope()) return; |
| 1104 | if (break_disabled()) return; |
| 1105 | |
| 1106 | ClearOneShot(); |
| 1107 | |
| 1108 | int current_frame_count = CurrentFrameCount(); |
| 1109 | |
| 1110 | // Iterate through the JavaScript stack looking for handlers. |
| 1111 | JavaScriptFrameIterator it(isolate_); |
| 1112 | while (!it.done()) { |
| 1113 | JavaScriptFrame* frame = it.frame(); |
| 1114 | if (frame->LookupExceptionHandlerInTable(nullptr, nullptr) > 0) break; |
| 1115 | std::vector<SharedFunctionInfo> infos; |
| 1116 | frame->GetFunctions(&infos); |
| 1117 | current_frame_count -= infos.size(); |
| 1118 | it.Advance(); |
| 1119 | } |
| 1120 | |
| 1121 | // No handler found. Nothing to instrument. |
| 1122 | if (it.done()) return; |
| 1123 | |
| 1124 | bool found_handler = false; |
| 1125 | // Iterate frames, including inlined frames. First, find the handler frame. |
| 1126 | // Then skip to the frame we want to break in, then instrument for stepping. |
| 1127 | for (; !it.done(); it.Advance()) { |
| 1128 | JavaScriptFrame* frame = JavaScriptFrame::cast(it.frame()); |
| 1129 | if (last_step_action() == StepInto) { |
| 1130 | // Deoptimize frame to ensure calls are checked for step-in. |
| 1131 | Deoptimizer::DeoptimizeFunction(frame->function()); |
| 1132 | } |
| 1133 | std::vector<FrameSummary> summaries; |
| 1134 | frame->Summarize(&summaries); |
| 1135 | for (size_t i = summaries.size(); i != 0; i--, current_frame_count--) { |
| 1136 | const FrameSummary& summary = summaries[i - 1]; |
| 1137 | if (!found_handler) { |
| 1138 | // We have yet to find the handler. If the frame inlines multiple |
| 1139 | // functions, we have to check each one for the handler. |
| 1140 | // If it only contains one function, we already found the handler. |
| 1141 | if (summaries.size() > 1) { |
| 1142 | Handle<AbstractCode> code = summary.AsJavaScript().abstract_code(); |
| 1143 | CHECK_EQ(CodeKind::INTERPRETED_FUNCTION, code->kind())do { bool _cmp = ::v8::base::CmpEQImpl< typename ::v8::base ::pass_value_or_ref<decltype(CodeKind::INTERPRETED_FUNCTION )>::type, typename ::v8::base::pass_value_or_ref<decltype (code->kind())>::type>((CodeKind::INTERPRETED_FUNCTION ), (code->kind())); do { if ((__builtin_expect(!!(!(_cmp)) , 0))) { V8_Fatal("Check failed: %s.", "CodeKind::INTERPRETED_FUNCTION" " " "==" " " "code->kind()"); } } while (false); } while ( false); |
| 1144 | HandlerTable table(code->GetBytecodeArray()); |
| 1145 | int code_offset = summary.code_offset(); |
| 1146 | HandlerTable::CatchPrediction prediction; |
| 1147 | int index = table.LookupRange(code_offset, nullptr, &prediction); |
| 1148 | if (index > 0) found_handler = true; |
| 1149 | } else { |
| 1150 | found_handler = true; |
| 1151 | } |
| 1152 | } |
| 1153 | |
| 1154 | if (found_handler) { |
| 1155 | // We found the handler. If we are stepping next or out, we need to |
| 1156 | // iterate until we found the suitable target frame to break in. |
| 1157 | if ((last_step_action() == StepOver || last_step_action() == StepOut) && |
| 1158 | current_frame_count > thread_local_.target_frame_count_) { |
| 1159 | continue; |
| 1160 | } |
| 1161 | Handle<SharedFunctionInfo> info( |
| 1162 | summary.AsJavaScript().function()->shared(), isolate_); |
| 1163 | if (IsBlackboxed(info)) continue; |
| 1164 | FloodWithOneShot(info); |
| 1165 | return; |
| 1166 | } |
| 1167 | } |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | void Debug::PrepareStep(StepAction step_action) { |
| 1172 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1173 | HandleScope scope(isolate_); |
| 1174 | |
| 1175 | DCHECK(in_debug_scope())((void) 0); |
| 1176 | |
| 1177 | // Get the frame where the execution has stopped and skip the debug frame if |
| 1178 | // any. The debug frame will only be present if execution was stopped due to |
| 1179 | // hitting a break point. In other situations (e.g. unhandled exception) the |
| 1180 | // debug frame is not present. |
| 1181 | StackFrameId frame_id = break_frame_id(); |
| 1182 | // If there is no JavaScript stack don't do anything. |
| 1183 | if (frame_id == StackFrameId::NO_ID) return; |
| 1184 | |
| 1185 | feature_tracker()->Track(DebugFeatureTracker::kStepping); |
| 1186 | |
| 1187 | thread_local_.last_step_action_ = step_action; |
| 1188 | |
| 1189 | StackTraceFrameIterator frames_it(isolate_, frame_id); |
| 1190 | CommonFrame* frame = frames_it.frame(); |
| 1191 | |
| 1192 | BreakLocation location = BreakLocation::Invalid(); |
| 1193 | Handle<SharedFunctionInfo> shared; |
| 1194 | int current_frame_count = CurrentFrameCount(); |
| 1195 | |
| 1196 | if (frame->is_java_script()) { |
| 1197 | JavaScriptFrame* js_frame = JavaScriptFrame::cast(frame); |
Value stored to 'js_frame' during its initialization is never read | |
| 1198 | DCHECK(js_frame->function().IsJSFunction())((void) 0); |
| 1199 | |
| 1200 | // Get the debug info (create it if it does not exist). |
| 1201 | auto summary = FrameSummary::GetTop(frame).AsJavaScript(); |
| 1202 | Handle<JSFunction> function(summary.function()); |
| 1203 | shared = Handle<SharedFunctionInfo>(function->shared(), isolate_); |
| 1204 | if (!EnsureBreakInfo(shared)) return; |
| 1205 | PrepareFunctionForDebugExecution(shared); |
| 1206 | |
| 1207 | // PrepareFunctionForDebugExecution can invalidate Baseline frames |
| 1208 | js_frame = JavaScriptFrame::cast(frames_it.Reframe()); |
| 1209 | |
| 1210 | Handle<DebugInfo> debug_info(shared->GetDebugInfo(), isolate_); |
| 1211 | location = BreakLocation::FromFrame(debug_info, js_frame); |
| 1212 | |
| 1213 | // Any step at a return is a step-out, and a step-out at a suspend behaves |
| 1214 | // like a return. |
| 1215 | if (location.IsReturn() || |
| 1216 | (location.IsSuspend() && |
| 1217 | (step_action == StepOut || (IsGeneratorFunction(shared->kind()) && |
| 1218 | location.generator_suspend_id() == 0)))) { |
| 1219 | // On StepOut we'll ignore our further calls to current function in |
| 1220 | // PrepareStepIn callback. |
| 1221 | if (last_step_action() == StepOut) { |
| 1222 | thread_local_.ignore_step_into_function_ = *function; |
| 1223 | } |
| 1224 | step_action = StepOut; |
| 1225 | thread_local_.last_step_action_ = StepInto; |
| 1226 | } |
| 1227 | |
| 1228 | // We need to schedule DebugOnFunction call callback |
| 1229 | UpdateHookOnFunctionCall(); |
| 1230 | |
| 1231 | // A step-next in blackboxed function is a step-out. |
| 1232 | if (step_action == StepOver && IsBlackboxed(shared)) step_action = StepOut; |
| 1233 | |
| 1234 | thread_local_.last_statement_position_ = |
| 1235 | summary.abstract_code()->SourceStatementPosition(summary.code_offset()); |
| 1236 | thread_local_.last_frame_count_ = current_frame_count; |
| 1237 | // No longer perform the current async step. |
| 1238 | clear_suspended_generator(); |
| 1239 | #if V8_ENABLE_WEBASSEMBLY1 |
| 1240 | } else if (frame->is_wasm() && step_action != StepOut) { |
| 1241 | // Handle stepping in wasm. |
| 1242 | WasmFrame* wasm_frame = WasmFrame::cast(frame); |
| 1243 | auto* debug_info = wasm_frame->native_module()->GetDebugInfo(); |
| 1244 | if (debug_info->PrepareStep(wasm_frame)) { |
| 1245 | UpdateHookOnFunctionCall(); |
| 1246 | return; |
| 1247 | } |
| 1248 | // If the wasm code is not debuggable or will return after this step |
| 1249 | // (indicated by {PrepareStep} returning false), then step out of that frame |
| 1250 | // instead. |
| 1251 | step_action = StepOut; |
| 1252 | UpdateHookOnFunctionCall(); |
| 1253 | #endif // V8_ENABLE_WEBASSEMBLY |
| 1254 | } |
| 1255 | |
| 1256 | switch (step_action) { |
| 1257 | case StepNone: |
| 1258 | UNREACHABLE()V8_Fatal("unreachable code"); |
| 1259 | case StepOut: { |
| 1260 | // Clear last position info. For stepping out it does not matter. |
| 1261 | thread_local_.last_statement_position_ = kNoSourcePosition; |
| 1262 | thread_local_.last_frame_count_ = -1; |
| 1263 | if (!shared.is_null()) { |
| 1264 | if (!location.IsReturnOrSuspend() && !IsBlackboxed(shared)) { |
| 1265 | // At not return position we flood return positions with one shots and |
| 1266 | // will repeat StepOut automatically at next break. |
| 1267 | thread_local_.target_frame_count_ = current_frame_count; |
| 1268 | thread_local_.fast_forward_to_return_ = true; |
| 1269 | FloodWithOneShot(shared, true); |
| 1270 | return; |
| 1271 | } |
| 1272 | if (IsAsyncFunction(shared->kind())) { |
| 1273 | // Stepping out of an async function whose implicit promise is awaited |
| 1274 | // by some other async function, should resume the latter. The return |
| 1275 | // value here is either a JSPromise or a JSGeneratorObject (for the |
| 1276 | // initial yield of async generators). |
| 1277 | Handle<JSReceiver> return_value( |
| 1278 | JSReceiver::cast(thread_local_.return_value_), isolate_); |
| 1279 | Handle<Object> awaited_by = JSReceiver::GetDataProperty( |
| 1280 | isolate_, return_value, |
| 1281 | isolate_->factory()->promise_awaited_by_symbol()); |
| 1282 | if (awaited_by->IsJSGeneratorObject()) { |
| 1283 | DCHECK(!has_suspended_generator())((void) 0); |
| 1284 | thread_local_.suspended_generator_ = *awaited_by; |
| 1285 | ClearStepping(); |
| 1286 | return; |
| 1287 | } |
| 1288 | } |
| 1289 | } |
| 1290 | // Skip the current frame, find the first frame we want to step out to |
| 1291 | // and deoptimize every frame along the way. |
| 1292 | bool in_current_frame = true; |
| 1293 | for (; !frames_it.done(); frames_it.Advance()) { |
| 1294 | #if V8_ENABLE_WEBASSEMBLY1 |
| 1295 | if (frames_it.frame()->is_wasm()) { |
| 1296 | if (in_current_frame) { |
| 1297 | in_current_frame = false; |
| 1298 | continue; |
| 1299 | } |
| 1300 | // Handle stepping out into Wasm. |
| 1301 | WasmFrame* wasm_frame = WasmFrame::cast(frames_it.frame()); |
| 1302 | auto* debug_info = wasm_frame->native_module()->GetDebugInfo(); |
| 1303 | debug_info->PrepareStepOutTo(wasm_frame); |
| 1304 | return; |
| 1305 | } |
| 1306 | #endif // V8_ENABLE_WEBASSEMBLY |
| 1307 | JavaScriptFrame* js_frame = JavaScriptFrame::cast(frames_it.frame()); |
| 1308 | if (last_step_action() == StepInto) { |
| 1309 | // Deoptimize frame to ensure calls are checked for step-in. |
| 1310 | Deoptimizer::DeoptimizeFunction(js_frame->function()); |
| 1311 | } |
| 1312 | HandleScope inner_scope(isolate_); |
| 1313 | std::vector<Handle<SharedFunctionInfo>> infos; |
| 1314 | js_frame->GetFunctions(&infos); |
| 1315 | for (; !infos.empty(); current_frame_count--) { |
| 1316 | Handle<SharedFunctionInfo> info = infos.back(); |
| 1317 | infos.pop_back(); |
| 1318 | if (in_current_frame) { |
| 1319 | // We want to step out, so skip the current frame. |
| 1320 | in_current_frame = false; |
| 1321 | continue; |
| 1322 | } |
| 1323 | if (IsBlackboxed(info)) continue; |
| 1324 | FloodWithOneShot(info); |
| 1325 | thread_local_.target_frame_count_ = current_frame_count; |
| 1326 | return; |
| 1327 | } |
| 1328 | } |
| 1329 | break; |
| 1330 | } |
| 1331 | case StepOver: |
| 1332 | thread_local_.target_frame_count_ = current_frame_count; |
| 1333 | V8_FALLTHROUGH[[clang::fallthrough]]; |
| 1334 | case StepInto: |
| 1335 | FloodWithOneShot(shared); |
| 1336 | break; |
| 1337 | } |
| 1338 | } |
| 1339 | |
| 1340 | // Simple function for returning the source positions for active break points. |
| 1341 | Handle<Object> Debug::GetSourceBreakLocations( |
| 1342 | Isolate* isolate, Handle<SharedFunctionInfo> shared) { |
| 1343 | RCS_SCOPE(isolate, RuntimeCallCounterId::kDebugger); |
| 1344 | if (!shared->HasBreakInfo()) { |
| 1345 | return isolate->factory()->undefined_value(); |
| 1346 | } |
| 1347 | |
| 1348 | Handle<DebugInfo> debug_info(shared->GetDebugInfo(), isolate); |
| 1349 | if (debug_info->GetBreakPointCount(isolate) == 0) { |
| 1350 | return isolate->factory()->undefined_value(); |
| 1351 | } |
| 1352 | Handle<FixedArray> locations = isolate->factory()->NewFixedArray( |
| 1353 | debug_info->GetBreakPointCount(isolate)); |
| 1354 | int count = 0; |
| 1355 | for (int i = 0; i < debug_info->break_points().length(); ++i) { |
| 1356 | if (!debug_info->break_points().get(i).IsUndefined(isolate)) { |
| 1357 | BreakPointInfo break_point_info = |
| 1358 | BreakPointInfo::cast(debug_info->break_points().get(i)); |
| 1359 | int break_points = break_point_info.GetBreakPointCount(isolate); |
| 1360 | if (break_points == 0) continue; |
| 1361 | for (int j = 0; j < break_points; ++j) { |
| 1362 | locations->set(count++, |
| 1363 | Smi::FromInt(break_point_info.source_position())); |
| 1364 | } |
| 1365 | } |
| 1366 | } |
| 1367 | return locations; |
| 1368 | } |
| 1369 | |
| 1370 | void Debug::ClearStepping() { |
| 1371 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1372 | // Clear the various stepping setup. |
| 1373 | ClearOneShot(); |
| 1374 | |
| 1375 | thread_local_.last_step_action_ = StepNone; |
| 1376 | thread_local_.last_statement_position_ = kNoSourcePosition; |
| 1377 | thread_local_.ignore_step_into_function_ = Smi::zero(); |
| 1378 | thread_local_.fast_forward_to_return_ = false; |
| 1379 | thread_local_.last_frame_count_ = -1; |
| 1380 | thread_local_.target_frame_count_ = -1; |
| 1381 | thread_local_.break_on_next_function_call_ = false; |
| 1382 | UpdateHookOnFunctionCall(); |
| 1383 | } |
| 1384 | |
| 1385 | // Clears all the one-shot break points that are currently set. Normally this |
| 1386 | // function is called each time a break point is hit as one shot break points |
| 1387 | // are used to support stepping. |
| 1388 | void Debug::ClearOneShot() { |
| 1389 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1390 | // The current implementation just runs through all the breakpoints. When the |
| 1391 | // last break point for a function is removed that function is automatically |
| 1392 | // removed from the list. |
| 1393 | for (DebugInfoListNode* node = debug_info_list_; node != nullptr; |
| 1394 | node = node->next()) { |
| 1395 | Handle<DebugInfo> debug_info = node->debug_info(); |
| 1396 | ClearBreakPoints(debug_info); |
| 1397 | ApplyBreakPoints(debug_info); |
| 1398 | } |
| 1399 | } |
| 1400 | |
| 1401 | namespace { |
| 1402 | class DiscardBaselineCodeVisitor : public ThreadVisitor { |
| 1403 | public: |
| 1404 | explicit DiscardBaselineCodeVisitor(SharedFunctionInfo shared) |
| 1405 | : shared_(shared) {} |
| 1406 | DiscardBaselineCodeVisitor() : shared_(SharedFunctionInfo()) {} |
| 1407 | |
| 1408 | void VisitThread(Isolate* isolate, ThreadLocalTop* top) override { |
| 1409 | DisallowGarbageCollection diallow_gc; |
| 1410 | bool deopt_all = shared_ == SharedFunctionInfo(); |
| 1411 | for (JavaScriptFrameIterator it(isolate, top); !it.done(); it.Advance()) { |
| 1412 | if (!deopt_all && it.frame()->function().shared() != shared_) continue; |
| 1413 | if (it.frame()->type() == StackFrame::BASELINE) { |
| 1414 | BaselineFrame* frame = BaselineFrame::cast(it.frame()); |
| 1415 | int bytecode_offset = frame->GetBytecodeOffset(); |
| 1416 | Address* pc_addr = frame->pc_address(); |
| 1417 | Address advance = BUILTIN_CODE(isolate, InterpreterEnterAtNextBytecode)(isolate)->builtins()->code_handle(i::Builtin::kInterpreterEnterAtNextBytecode ) |
| 1418 | ->InstructionStart(); |
| 1419 | PointerAuthentication::ReplacePC(pc_addr, advance, kSystemPointerSize); |
| 1420 | InterpretedFrame::cast(it.Reframe()) |
| 1421 | ->PatchBytecodeOffset(bytecode_offset); |
| 1422 | } else if (it.frame()->type() == StackFrame::INTERPRETED) { |
| 1423 | // Check if the PC is a baseline entry trampoline. If it is, replace it |
| 1424 | // with the corresponding interpreter entry trampoline. |
| 1425 | // This is the case if a baseline function was inlined into a function |
| 1426 | // we deoptimized in the debugger and are stepping into it. |
| 1427 | JavaScriptFrame* frame = it.frame(); |
| 1428 | Address pc = frame->pc(); |
| 1429 | Builtin builtin = OffHeapInstructionStream::TryLookupCode(isolate, pc); |
| 1430 | if (builtin == Builtin::kBaselineOrInterpreterEnterAtBytecode || |
| 1431 | builtin == Builtin::kBaselineOrInterpreterEnterAtNextBytecode) { |
| 1432 | Address* pc_addr = frame->pc_address(); |
| 1433 | Builtin advance = |
| 1434 | builtin == Builtin::kBaselineOrInterpreterEnterAtBytecode |
| 1435 | ? Builtin::kInterpreterEnterAtBytecode |
| 1436 | : Builtin::kInterpreterEnterAtNextBytecode; |
| 1437 | Address advance_pc = |
| 1438 | isolate->builtins()->code(advance).InstructionStart(); |
| 1439 | PointerAuthentication::ReplacePC(pc_addr, advance_pc, |
| 1440 | kSystemPointerSize); |
| 1441 | } |
| 1442 | } |
| 1443 | } |
| 1444 | } |
| 1445 | |
| 1446 | private: |
| 1447 | SharedFunctionInfo shared_; |
| 1448 | }; |
| 1449 | } // namespace |
| 1450 | |
| 1451 | void Debug::DiscardBaselineCode(SharedFunctionInfo shared) { |
| 1452 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1453 | DCHECK(shared.HasBaselineCode())((void) 0); |
| 1454 | Isolate* isolate = shared.GetIsolate(); |
| 1455 | DiscardBaselineCodeVisitor visitor(shared); |
| 1456 | visitor.VisitThread(isolate, isolate->thread_local_top()); |
| 1457 | isolate->thread_manager()->IterateArchivedThreads(&visitor); |
| 1458 | // TODO(v8:11429): Avoid this heap walk somehow. |
| 1459 | HeapObjectIterator iterator(isolate->heap()); |
| 1460 | auto trampoline = BUILTIN_CODE(isolate, InterpreterEntryTrampoline)(isolate)->builtins()->code_handle(i::Builtin::kInterpreterEntryTrampoline ); |
| 1461 | shared.FlushBaselineCode(); |
| 1462 | for (HeapObject obj = iterator.Next(); !obj.is_null(); |
| 1463 | obj = iterator.Next()) { |
| 1464 | if (obj.IsJSFunction()) { |
| 1465 | JSFunction fun = JSFunction::cast(obj); |
| 1466 | if (fun.shared() == shared && fun.ActiveTierIsBaseline()) { |
| 1467 | fun.set_code(*trampoline); |
| 1468 | } |
| 1469 | } |
| 1470 | } |
| 1471 | } |
| 1472 | |
| 1473 | void Debug::DiscardAllBaselineCode() { |
| 1474 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1475 | DiscardBaselineCodeVisitor visitor; |
| 1476 | visitor.VisitThread(isolate_, isolate_->thread_local_top()); |
| 1477 | HeapObjectIterator iterator(isolate_->heap()); |
| 1478 | auto trampoline = BUILTIN_CODE(isolate_, InterpreterEntryTrampoline)(isolate_)->builtins()->code_handle(i::Builtin::kInterpreterEntryTrampoline ); |
| 1479 | isolate_->thread_manager()->IterateArchivedThreads(&visitor); |
| 1480 | for (HeapObject obj = iterator.Next(); !obj.is_null(); |
| 1481 | obj = iterator.Next()) { |
| 1482 | if (obj.IsJSFunction()) { |
| 1483 | JSFunction fun = JSFunction::cast(obj); |
| 1484 | if (fun.ActiveTierIsBaseline()) { |
| 1485 | fun.set_code(*trampoline); |
| 1486 | } |
| 1487 | } else if (obj.IsSharedFunctionInfo()) { |
| 1488 | SharedFunctionInfo shared = SharedFunctionInfo::cast(obj); |
| 1489 | if (shared.HasBaselineCode()) { |
| 1490 | shared.FlushBaselineCode(); |
| 1491 | } |
| 1492 | } |
| 1493 | } |
| 1494 | } |
| 1495 | |
| 1496 | void Debug::DeoptimizeFunction(Handle<SharedFunctionInfo> shared) { |
| 1497 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1498 | // Deoptimize all code compiled from this shared function info including |
| 1499 | // inlining. |
| 1500 | isolate_->AbortConcurrentOptimization(BlockingBehavior::kBlock); |
| 1501 | |
| 1502 | if (shared->HasBaselineCode()) { |
| 1503 | DiscardBaselineCode(*shared); |
| 1504 | } |
| 1505 | |
| 1506 | bool found_something = false; |
| 1507 | Code::OptimizedCodeIterator iterator(isolate_); |
| 1508 | do { |
| 1509 | Code code = iterator.Next(); |
| 1510 | if (code.is_null()) break; |
| 1511 | if (code.Inlines(*shared)) { |
| 1512 | code.set_marked_for_deoptimization(true); |
| 1513 | found_something = true; |
| 1514 | } |
| 1515 | } while (true); |
| 1516 | |
| 1517 | if (found_something) { |
| 1518 | // Only go through with the deoptimization if something was found. |
| 1519 | Deoptimizer::DeoptimizeMarkedCode(isolate_); |
| 1520 | } |
| 1521 | } |
| 1522 | |
| 1523 | void Debug::PrepareFunctionForDebugExecution( |
| 1524 | Handle<SharedFunctionInfo> shared) { |
| 1525 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1526 | // To prepare bytecode for debugging, we already need to have the debug |
| 1527 | // info (containing the debug copy) upfront, but since we do not recompile, |
| 1528 | // preparing for break points cannot fail. |
| 1529 | DCHECK(shared->is_compiled())((void) 0); |
| 1530 | DCHECK(shared->HasDebugInfo())((void) 0); |
| 1531 | Handle<DebugInfo> debug_info = GetOrCreateDebugInfo(shared); |
| 1532 | if (debug_info->flags(kRelaxedLoad) & DebugInfo::kPreparedForDebugExecution) { |
| 1533 | return; |
| 1534 | } |
| 1535 | |
| 1536 | // Have to discard baseline code before installing debug bytecode, since the |
| 1537 | // bytecode array field on the baseline code object is immutable. |
| 1538 | if (debug_info->CanBreakAtEntry()) { |
| 1539 | // Deopt everything in case the function is inlined anywhere. |
| 1540 | Deoptimizer::DeoptimizeAll(isolate_); |
| 1541 | DiscardAllBaselineCode(); |
| 1542 | } else { |
| 1543 | DeoptimizeFunction(shared); |
| 1544 | } |
| 1545 | |
| 1546 | if (shared->HasBytecodeArray()) { |
| 1547 | DCHECK(!shared->HasBaselineCode())((void) 0); |
| 1548 | SharedFunctionInfo::InstallDebugBytecode(shared, isolate_); |
| 1549 | } |
| 1550 | |
| 1551 | if (debug_info->CanBreakAtEntry()) { |
| 1552 | InstallDebugBreakTrampoline(); |
| 1553 | } else { |
| 1554 | // Update PCs on the stack to point to recompiled code. |
| 1555 | RedirectActiveFunctions redirect_visitor( |
| 1556 | *shared, RedirectActiveFunctions::Mode::kUseDebugBytecode); |
| 1557 | redirect_visitor.VisitThread(isolate_, isolate_->thread_local_top()); |
| 1558 | isolate_->thread_manager()->IterateArchivedThreads(&redirect_visitor); |
| 1559 | } |
| 1560 | |
| 1561 | debug_info->set_flags( |
| 1562 | debug_info->flags(kRelaxedLoad) | DebugInfo::kPreparedForDebugExecution, |
| 1563 | kRelaxedStore); |
| 1564 | } |
| 1565 | |
| 1566 | void Debug::InstallDebugBreakTrampoline() { |
| 1567 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1568 | // Check the list of debug infos whether the debug break trampoline needs to |
| 1569 | // be installed. If that's the case, iterate the heap for functions to rewire |
| 1570 | // to the trampoline. |
| 1571 | HandleScope scope(isolate_); |
| 1572 | // If there is a breakpoint at function entry, we need to install trampoline. |
| 1573 | bool needs_to_use_trampoline = false; |
| 1574 | // If there we break at entry to an api callback, we need to clear ICs. |
| 1575 | bool needs_to_clear_ic = false; |
| 1576 | for (DebugInfoListNode* current = debug_info_list_; current != nullptr; |
| 1577 | current = current->next()) { |
| 1578 | if (current->debug_info()->CanBreakAtEntry()) { |
| 1579 | needs_to_use_trampoline = true; |
| 1580 | if (current->debug_info()->shared().IsApiFunction()) { |
| 1581 | needs_to_clear_ic = true; |
| 1582 | break; |
| 1583 | } |
| 1584 | } |
| 1585 | } |
| 1586 | |
| 1587 | if (!needs_to_use_trampoline) return; |
| 1588 | |
| 1589 | Handle<CodeT> trampoline = BUILTIN_CODE(isolate_, DebugBreakTrampoline)(isolate_)->builtins()->code_handle(i::Builtin::kDebugBreakTrampoline ); |
| 1590 | std::vector<Handle<JSFunction>> needs_compile; |
| 1591 | { |
| 1592 | HeapObjectIterator iterator(isolate_->heap()); |
| 1593 | for (HeapObject obj = iterator.Next(); !obj.is_null(); |
| 1594 | obj = iterator.Next()) { |
| 1595 | if (needs_to_clear_ic && obj.IsFeedbackVector()) { |
| 1596 | FeedbackVector::cast(obj).ClearSlots(isolate_); |
| 1597 | continue; |
| 1598 | } else if (obj.IsJSFunction()) { |
| 1599 | JSFunction fun = JSFunction::cast(obj); |
| 1600 | SharedFunctionInfo shared = fun.shared(); |
| 1601 | if (!shared.HasDebugInfo()) continue; |
| 1602 | if (!shared.GetDebugInfo().CanBreakAtEntry()) continue; |
| 1603 | if (!fun.is_compiled()) { |
| 1604 | needs_compile.push_back(handle(fun, isolate_)); |
| 1605 | } else { |
| 1606 | fun.set_code(*trampoline); |
| 1607 | } |
| 1608 | } |
| 1609 | } |
| 1610 | } |
| 1611 | |
| 1612 | // By overwriting the function code with DebugBreakTrampoline, which tailcalls |
| 1613 | // to shared code, we bypass CompileLazy. Perform CompileLazy here instead. |
| 1614 | for (Handle<JSFunction> fun : needs_compile) { |
| 1615 | IsCompiledScope is_compiled_scope; |
| 1616 | Compiler::Compile(isolate_, fun, Compiler::CLEAR_EXCEPTION, |
| 1617 | &is_compiled_scope); |
| 1618 | DCHECK(is_compiled_scope.is_compiled())((void) 0); |
| 1619 | fun->set_code(*trampoline); |
| 1620 | } |
| 1621 | } |
| 1622 | |
| 1623 | namespace { |
| 1624 | template <typename Iterator> |
| 1625 | void GetBreakablePositions(Iterator* it, int start_position, int end_position, |
| 1626 | std::vector<BreakLocation>* locations) { |
| 1627 | while (!it->Done()) { |
| 1628 | if (it->position() >= start_position && it->position() < end_position) { |
| 1629 | locations->push_back(it->GetBreakLocation()); |
| 1630 | } |
| 1631 | it->Next(); |
| 1632 | } |
| 1633 | } |
| 1634 | |
| 1635 | void FindBreakablePositions(Handle<DebugInfo> debug_info, int start_position, |
| 1636 | int end_position, |
| 1637 | std::vector<BreakLocation>* locations) { |
| 1638 | DCHECK(debug_info->HasInstrumentedBytecodeArray())((void) 0); |
| 1639 | BreakIterator it(debug_info); |
| 1640 | GetBreakablePositions(&it, start_position, end_position, locations); |
| 1641 | } |
| 1642 | |
| 1643 | bool CompileTopLevel(Isolate* isolate, Handle<Script> script) { |
| 1644 | UnoptimizedCompileState compile_state; |
| 1645 | ReusableUnoptimizedCompileState reusable_state(isolate); |
| 1646 | UnoptimizedCompileFlags flags = |
| 1647 | UnoptimizedCompileFlags::ForScriptCompile(isolate, *script); |
| 1648 | ParseInfo parse_info(isolate, flags, &compile_state, &reusable_state); |
| 1649 | IsCompiledScope is_compiled_scope; |
| 1650 | const MaybeHandle<SharedFunctionInfo> maybe_result = |
| 1651 | Compiler::CompileToplevel(&parse_info, script, isolate, |
| 1652 | &is_compiled_scope); |
| 1653 | if (maybe_result.is_null()) { |
| 1654 | if (isolate->has_pending_exception()) { |
| 1655 | isolate->clear_pending_exception(); |
| 1656 | } |
| 1657 | return false; |
| 1658 | } |
| 1659 | return true; |
| 1660 | } |
| 1661 | } // namespace |
| 1662 | |
| 1663 | bool Debug::GetPossibleBreakpoints(Handle<Script> script, int start_position, |
| 1664 | int end_position, bool restrict_to_function, |
| 1665 | std::vector<BreakLocation>* locations) { |
| 1666 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1667 | if (restrict_to_function) { |
| 1668 | Handle<Object> result = |
| 1669 | FindInnermostContainingFunctionInfo(script, start_position); |
| 1670 | if (result->IsUndefined(isolate_)) return false; |
| 1671 | |
| 1672 | // Make sure the function has set up the debug info. |
| 1673 | Handle<SharedFunctionInfo> shared = |
| 1674 | Handle<SharedFunctionInfo>::cast(result); |
| 1675 | if (!EnsureBreakInfo(shared)) return false; |
| 1676 | PrepareFunctionForDebugExecution(shared); |
| 1677 | |
| 1678 | Handle<DebugInfo> debug_info(shared->GetDebugInfo(), isolate_); |
| 1679 | FindBreakablePositions(debug_info, start_position, end_position, locations); |
| 1680 | return true; |
| 1681 | } |
| 1682 | |
| 1683 | HandleScope scope(isolate_); |
| 1684 | std::vector<Handle<SharedFunctionInfo>> candidates; |
| 1685 | if (!FindSharedFunctionInfosIntersectingRange(script, start_position, |
| 1686 | end_position, &candidates)) { |
| 1687 | return false; |
| 1688 | } |
| 1689 | for (const auto& candidate : candidates) { |
| 1690 | CHECK(candidate->HasBreakInfo())do { if ((__builtin_expect(!!(!(candidate->HasBreakInfo()) ), 0))) { V8_Fatal("Check failed: %s.", "candidate->HasBreakInfo()" ); } } while (false); |
| 1691 | Handle<DebugInfo> debug_info(candidate->GetDebugInfo(), isolate_); |
| 1692 | FindBreakablePositions(debug_info, start_position, end_position, locations); |
| 1693 | } |
| 1694 | return true; |
| 1695 | } |
| 1696 | |
| 1697 | class SharedFunctionInfoFinder { |
| 1698 | public: |
| 1699 | explicit SharedFunctionInfoFinder(int target_position) |
| 1700 | : current_start_position_(kNoSourcePosition), |
| 1701 | target_position_(target_position) {} |
| 1702 | |
| 1703 | void NewCandidate(SharedFunctionInfo shared, |
| 1704 | JSFunction closure = JSFunction()) { |
| 1705 | if (!shared.IsSubjectToDebugging()) return; |
| 1706 | int start_position = shared.function_token_position(); |
| 1707 | if (start_position == kNoSourcePosition) { |
| 1708 | start_position = shared.StartPosition(); |
| 1709 | } |
| 1710 | |
| 1711 | if (start_position > target_position_) return; |
| 1712 | if (target_position_ >= shared.EndPosition()) { |
| 1713 | // The SharedFunctionInfo::EndPosition() is generally exclusive, but there |
| 1714 | // are assumptions in various places in the debugger that for script level |
| 1715 | // (toplevel function) there's an end position that is technically outside |
| 1716 | // the script. It might be worth revisiting the overall design here at |
| 1717 | // some point in the future. |
| 1718 | if (!shared.is_toplevel() || target_position_ > shared.EndPosition()) { |
| 1719 | return; |
| 1720 | } |
| 1721 | } |
| 1722 | |
| 1723 | if (!current_candidate_.is_null()) { |
| 1724 | if (current_start_position_ == start_position && |
| 1725 | shared.EndPosition() == current_candidate_.EndPosition()) { |
| 1726 | // If we already have a matching closure, do not throw it away. |
| 1727 | if (!current_candidate_closure_.is_null() && closure.is_null()) return; |
| 1728 | // If a top-level function contains only one function |
| 1729 | // declaration the source for the top-level and the function |
| 1730 | // is the same. In that case prefer the non top-level function. |
| 1731 | if (!current_candidate_.is_toplevel() && shared.is_toplevel()) return; |
| 1732 | } else if (start_position < current_start_position_ || |
| 1733 | current_candidate_.EndPosition() < shared.EndPosition()) { |
| 1734 | return; |
| 1735 | } |
| 1736 | } |
| 1737 | |
| 1738 | current_start_position_ = start_position; |
| 1739 | current_candidate_ = shared; |
| 1740 | current_candidate_closure_ = closure; |
| 1741 | } |
| 1742 | |
| 1743 | SharedFunctionInfo Result() { return current_candidate_; } |
| 1744 | |
| 1745 | JSFunction ResultClosure() { return current_candidate_closure_; } |
| 1746 | |
| 1747 | private: |
| 1748 | SharedFunctionInfo current_candidate_; |
| 1749 | JSFunction current_candidate_closure_; |
| 1750 | int current_start_position_; |
| 1751 | int target_position_; |
| 1752 | DISALLOW_GARBAGE_COLLECTION(no_gc_) |
| 1753 | }; |
| 1754 | |
| 1755 | namespace { |
| 1756 | SharedFunctionInfo FindSharedFunctionInfoCandidate(int position, |
| 1757 | Handle<Script> script, |
| 1758 | Isolate* isolate) { |
| 1759 | SharedFunctionInfoFinder finder(position); |
| 1760 | SharedFunctionInfo::ScriptIterator iterator(isolate, *script); |
| 1761 | for (SharedFunctionInfo info = iterator.Next(); !info.is_null(); |
| 1762 | info = iterator.Next()) { |
| 1763 | finder.NewCandidate(info); |
| 1764 | } |
| 1765 | return finder.Result(); |
| 1766 | } |
| 1767 | } // namespace |
| 1768 | |
| 1769 | Handle<SharedFunctionInfo> Debug::FindClosestSharedFunctionInfoFromPosition( |
| 1770 | int position, Handle<Script> script, |
| 1771 | Handle<SharedFunctionInfo> outer_shared) { |
| 1772 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1773 | CHECK(outer_shared->HasBreakInfo())do { if ((__builtin_expect(!!(!(outer_shared->HasBreakInfo ())), 0))) { V8_Fatal("Check failed: %s.", "outer_shared->HasBreakInfo()" ); } } while (false); |
| 1774 | int closest_position = FindBreakablePosition( |
| 1775 | Handle<DebugInfo>(outer_shared->GetDebugInfo(), isolate_), position); |
| 1776 | Handle<SharedFunctionInfo> closest_candidate = outer_shared; |
| 1777 | if (closest_position == position) return outer_shared; |
| 1778 | |
| 1779 | const int start_position = outer_shared->StartPosition(); |
| 1780 | const int end_position = outer_shared->EndPosition(); |
| 1781 | if (start_position == end_position) return outer_shared; |
| 1782 | |
| 1783 | if (closest_position == 0) closest_position = end_position; |
| 1784 | std::vector<Handle<SharedFunctionInfo>> candidates; |
| 1785 | // Find all shared function infos of functions that are intersecting from |
| 1786 | // the requested position until the end of the enclosing function. |
| 1787 | if (!FindSharedFunctionInfosIntersectingRange( |
| 1788 | script, position, closest_position, &candidates)) { |
| 1789 | return outer_shared; |
| 1790 | } |
| 1791 | |
| 1792 | for (auto candidate : candidates) { |
| 1793 | CHECK(candidate->HasBreakInfo())do { if ((__builtin_expect(!!(!(candidate->HasBreakInfo()) ), 0))) { V8_Fatal("Check failed: %s.", "candidate->HasBreakInfo()" ); } } while (false); |
| 1794 | Handle<DebugInfo> debug_info(candidate->GetDebugInfo(), isolate_); |
| 1795 | const int candidate_position = FindBreakablePosition(debug_info, position); |
| 1796 | if (candidate_position >= position && |
| 1797 | candidate_position < closest_position) { |
| 1798 | closest_position = candidate_position; |
| 1799 | closest_candidate = candidate; |
| 1800 | } |
| 1801 | if (closest_position == position) break; |
| 1802 | } |
| 1803 | return closest_candidate; |
| 1804 | } |
| 1805 | |
| 1806 | bool Debug::FindSharedFunctionInfosIntersectingRange( |
| 1807 | Handle<Script> script, int start_position, int end_position, |
| 1808 | std::vector<Handle<SharedFunctionInfo>>* intersecting_shared) { |
| 1809 | bool candidateSubsumesRange = false; |
| 1810 | bool triedTopLevelCompile = false; |
| 1811 | |
| 1812 | while (true) { |
| 1813 | std::vector<Handle<SharedFunctionInfo>> candidates; |
| 1814 | std::vector<IsCompiledScope> compiled_scopes; |
| 1815 | { |
| 1816 | DisallowGarbageCollection no_gc; |
| 1817 | SharedFunctionInfo::ScriptIterator iterator(isolate_, *script); |
| 1818 | for (SharedFunctionInfo info = iterator.Next(); !info.is_null(); |
| 1819 | info = iterator.Next()) { |
| 1820 | if (info.EndPosition() < start_position || |
| 1821 | info.StartPosition() >= end_position) { |
| 1822 | continue; |
| 1823 | } |
| 1824 | candidateSubsumesRange |= info.StartPosition() <= start_position && |
| 1825 | info.EndPosition() >= end_position; |
| 1826 | if (!info.IsSubjectToDebugging()) continue; |
| 1827 | if (!info.is_compiled() && !info.allows_lazy_compilation()) continue; |
| 1828 | candidates.push_back(i::handle(info, isolate_)); |
| 1829 | } |
| 1830 | } |
| 1831 | |
| 1832 | if (!triedTopLevelCompile && !candidateSubsumesRange && |
| 1833 | script->shared_function_info_count() > 0) { |
| 1834 | DCHECK_LE(script->shared_function_info_count(),((void) 0) |
| 1835 | script->shared_function_infos().length())((void) 0); |
| 1836 | MaybeObject maybeToplevel = script->shared_function_infos().Get(0); |
| 1837 | HeapObject heap_object; |
| 1838 | const bool topLevelInfoExists = |
| 1839 | maybeToplevel->GetHeapObject(&heap_object) && |
| 1840 | !heap_object.IsUndefined(); |
| 1841 | if (!topLevelInfoExists) { |
| 1842 | triedTopLevelCompile = true; |
| 1843 | const bool success = CompileTopLevel(isolate_, script); |
| 1844 | if (!success) return false; |
| 1845 | continue; |
| 1846 | } |
| 1847 | } |
| 1848 | |
| 1849 | bool was_compiled = false; |
| 1850 | for (const auto& candidate : candidates) { |
| 1851 | IsCompiledScope is_compiled_scope(candidate->is_compiled_scope(isolate_)); |
| 1852 | if (!is_compiled_scope.is_compiled()) { |
| 1853 | // Code that cannot be compiled lazily are internal and not debuggable. |
| 1854 | DCHECK(candidate->allows_lazy_compilation())((void) 0); |
| 1855 | if (!Compiler::Compile(isolate_, candidate, Compiler::CLEAR_EXCEPTION, |
| 1856 | &is_compiled_scope)) { |
| 1857 | return false; |
| 1858 | } else { |
| 1859 | was_compiled = true; |
| 1860 | } |
| 1861 | } |
| 1862 | DCHECK(is_compiled_scope.is_compiled())((void) 0); |
| 1863 | compiled_scopes.push_back(is_compiled_scope); |
| 1864 | if (!EnsureBreakInfo(candidate)) return false; |
| 1865 | PrepareFunctionForDebugExecution(candidate); |
| 1866 | } |
| 1867 | if (was_compiled) continue; |
| 1868 | *intersecting_shared = std::move(candidates); |
| 1869 | return true; |
| 1870 | } |
| 1871 | UNREACHABLE()V8_Fatal("unreachable code"); |
| 1872 | } |
| 1873 | |
| 1874 | // We need to find a SFI for a literal that may not yet have been compiled yet, |
| 1875 | // and there may not be a JSFunction referencing it. Find the SFI closest to |
| 1876 | // the given position, compile it to reveal possible inner SFIs and repeat. |
| 1877 | // While we are at this, also ensure code with debug break slots so that we do |
| 1878 | // not have to compile a SFI without JSFunction, which is paifu for those that |
| 1879 | // cannot be compiled without context (need to find outer compilable SFI etc.) |
| 1880 | Handle<Object> Debug::FindInnermostContainingFunctionInfo(Handle<Script> script, |
| 1881 | int position) { |
| 1882 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1883 | for (int iteration = 0;; iteration++) { |
| 1884 | // Go through all shared function infos associated with this script to |
| 1885 | // find the innermost function containing this position. |
| 1886 | // If there is no shared function info for this script at all, there is |
| 1887 | // no point in looking for it by walking the heap. |
| 1888 | |
| 1889 | SharedFunctionInfo shared; |
| 1890 | IsCompiledScope is_compiled_scope; |
| 1891 | { |
| 1892 | shared = FindSharedFunctionInfoCandidate(position, script, isolate_); |
| 1893 | if (shared.is_null()) { |
| 1894 | if (iteration > 0) break; |
| 1895 | // It might be that the shared function info is not available as the |
| 1896 | // top level functions are removed due to the GC. Try to recompile |
| 1897 | // the top level functions. |
| 1898 | const bool success = CompileTopLevel(isolate_, script); |
| 1899 | if (!success) break; |
| 1900 | continue; |
| 1901 | } |
| 1902 | // We found it if it's already compiled. |
| 1903 | is_compiled_scope = shared.is_compiled_scope(isolate_); |
| 1904 | if (is_compiled_scope.is_compiled()) { |
| 1905 | Handle<SharedFunctionInfo> shared_handle(shared, isolate_); |
| 1906 | // If the iteration count is larger than 1, we had to compile the outer |
| 1907 | // function in order to create this shared function info. So there can |
| 1908 | // be no JSFunction referencing it. We can anticipate creating a debug |
| 1909 | // info while bypassing PrepareFunctionForDebugExecution. |
| 1910 | if (iteration > 1) { |
| 1911 | CreateBreakInfo(shared_handle); |
| 1912 | } |
| 1913 | return shared_handle; |
| 1914 | } |
| 1915 | } |
| 1916 | // If not, compile to reveal inner functions. |
| 1917 | HandleScope scope(isolate_); |
| 1918 | // Code that cannot be compiled lazily are internal and not debuggable. |
| 1919 | DCHECK(shared.allows_lazy_compilation())((void) 0); |
| 1920 | if (!Compiler::Compile(isolate_, handle(shared, isolate_), |
| 1921 | Compiler::CLEAR_EXCEPTION, &is_compiled_scope)) { |
| 1922 | break; |
| 1923 | } |
| 1924 | } |
| 1925 | return isolate_->factory()->undefined_value(); |
| 1926 | } |
| 1927 | |
| 1928 | // Ensures the debug information is present for shared. |
| 1929 | bool Debug::EnsureBreakInfo(Handle<SharedFunctionInfo> shared) { |
| 1930 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1931 | // Return if we already have the break info for shared. |
| 1932 | if (shared->HasBreakInfo()) return true; |
| 1933 | if (!shared->IsSubjectToDebugging() && !CanBreakAtEntry(shared)) { |
| 1934 | return false; |
| 1935 | } |
| 1936 | IsCompiledScope is_compiled_scope = shared->is_compiled_scope(isolate_); |
| 1937 | if (!is_compiled_scope.is_compiled() && |
| 1938 | !Compiler::Compile(isolate_, shared, Compiler::CLEAR_EXCEPTION, |
| 1939 | &is_compiled_scope, CreateSourcePositions::kYes)) { |
| 1940 | return false; |
| 1941 | } |
| 1942 | CreateBreakInfo(shared); |
| 1943 | return true; |
| 1944 | } |
| 1945 | |
| 1946 | void Debug::CreateBreakInfo(Handle<SharedFunctionInfo> shared) { |
| 1947 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1948 | HandleScope scope(isolate_); |
| 1949 | Handle<DebugInfo> debug_info = GetOrCreateDebugInfo(shared); |
| 1950 | |
| 1951 | // Initialize with break information. |
| 1952 | |
| 1953 | DCHECK(!debug_info->HasBreakInfo())((void) 0); |
| 1954 | |
| 1955 | Factory* factory = isolate_->factory(); |
| 1956 | Handle<FixedArray> break_points( |
| 1957 | factory->NewFixedArray(DebugInfo::kEstimatedNofBreakPointsInFunction)); |
| 1958 | |
| 1959 | int flags = debug_info->flags(kRelaxedLoad); |
| 1960 | flags |= DebugInfo::kHasBreakInfo; |
| 1961 | if (CanBreakAtEntry(shared)) flags |= DebugInfo::kCanBreakAtEntry; |
| 1962 | debug_info->set_flags(flags, kRelaxedStore); |
| 1963 | debug_info->set_break_points(*break_points); |
| 1964 | |
| 1965 | SharedFunctionInfo::EnsureSourcePositionsAvailable(isolate_, shared); |
| 1966 | } |
| 1967 | |
| 1968 | Handle<DebugInfo> Debug::GetOrCreateDebugInfo( |
| 1969 | Handle<SharedFunctionInfo> shared) { |
| 1970 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1971 | if (shared->HasDebugInfo()) return handle(shared->GetDebugInfo(), isolate_); |
| 1972 | |
| 1973 | // Create debug info and add it to the list. |
| 1974 | Handle<DebugInfo> debug_info = isolate_->factory()->NewDebugInfo(shared); |
| 1975 | DebugInfoListNode* node = new DebugInfoListNode(isolate_, *debug_info); |
| 1976 | node->set_next(debug_info_list_); |
| 1977 | debug_info_list_ = node; |
| 1978 | |
| 1979 | return debug_info; |
| 1980 | } |
| 1981 | |
| 1982 | void Debug::InstallCoverageInfo(Handle<SharedFunctionInfo> shared, |
| 1983 | Handle<CoverageInfo> coverage_info) { |
| 1984 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 1985 | DCHECK(!coverage_info.is_null())((void) 0); |
| 1986 | |
| 1987 | Handle<DebugInfo> debug_info = GetOrCreateDebugInfo(shared); |
| 1988 | |
| 1989 | DCHECK(!debug_info->HasCoverageInfo())((void) 0); |
| 1990 | |
| 1991 | debug_info->set_flags( |
| 1992 | debug_info->flags(kRelaxedLoad) | DebugInfo::kHasCoverageInfo, |
| 1993 | kRelaxedStore); |
| 1994 | debug_info->set_coverage_info(*coverage_info); |
| 1995 | } |
| 1996 | |
| 1997 | void Debug::RemoveAllCoverageInfos() { |
| 1998 | ClearAllDebugInfos( |
| 1999 | [=](Handle<DebugInfo> info) { info->ClearCoverageInfo(isolate_); }); |
| 2000 | } |
| 2001 | |
| 2002 | void Debug::ClearAllDebuggerHints() { |
| 2003 | ClearAllDebugInfos( |
| 2004 | [=](Handle<DebugInfo> info) { info->set_debugger_hints(0); }); |
| 2005 | } |
| 2006 | |
| 2007 | void Debug::FindDebugInfo(Handle<DebugInfo> debug_info, |
| 2008 | DebugInfoListNode** prev, DebugInfoListNode** curr) { |
| 2009 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2010 | HandleScope scope(isolate_); |
| 2011 | *prev = nullptr; |
| 2012 | *curr = debug_info_list_; |
| 2013 | while (*curr != nullptr) { |
| 2014 | if ((*curr)->debug_info().is_identical_to(debug_info)) return; |
| 2015 | *prev = *curr; |
| 2016 | *curr = (*curr)->next(); |
| 2017 | } |
| 2018 | |
| 2019 | UNREACHABLE()V8_Fatal("unreachable code"); |
| 2020 | } |
| 2021 | |
| 2022 | void Debug::ClearAllDebugInfos(const DebugInfoClearFunction& clear_function) { |
| 2023 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2024 | DebugInfoListNode* prev = nullptr; |
| 2025 | DebugInfoListNode* current = debug_info_list_; |
| 2026 | while (current != nullptr) { |
| 2027 | DebugInfoListNode* next = current->next(); |
| 2028 | Handle<DebugInfo> debug_info = current->debug_info(); |
| 2029 | clear_function(debug_info); |
| 2030 | if (debug_info->IsEmpty()) { |
| 2031 | FreeDebugInfoListNode(prev, current); |
| 2032 | current = next; |
| 2033 | } else { |
| 2034 | prev = current; |
| 2035 | current = next; |
| 2036 | } |
| 2037 | } |
| 2038 | } |
| 2039 | |
| 2040 | void Debug::RemoveBreakInfoAndMaybeFree(Handle<DebugInfo> debug_info) { |
| 2041 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2042 | debug_info->ClearBreakInfo(isolate_); |
| 2043 | if (debug_info->IsEmpty()) { |
| 2044 | DebugInfoListNode* prev; |
| 2045 | DebugInfoListNode* node; |
| 2046 | FindDebugInfo(debug_info, &prev, &node); |
| 2047 | FreeDebugInfoListNode(prev, node); |
| 2048 | } |
| 2049 | } |
| 2050 | |
| 2051 | void Debug::FreeDebugInfoListNode(DebugInfoListNode* prev, |
| 2052 | DebugInfoListNode* node) { |
| 2053 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2054 | DCHECK(node->debug_info()->IsEmpty())((void) 0); |
| 2055 | |
| 2056 | // Unlink from list. If prev is nullptr we are looking at the first element. |
| 2057 | if (prev == nullptr) { |
| 2058 | debug_info_list_ = node->next(); |
| 2059 | } else { |
| 2060 | prev->set_next(node->next()); |
| 2061 | } |
| 2062 | |
| 2063 | // Pack script back into the |
| 2064 | // SFI::script_or_debug_info field. |
| 2065 | Handle<DebugInfo> debug_info(node->debug_info()); |
| 2066 | debug_info->shared().set_script_or_debug_info(debug_info->script(), |
| 2067 | kReleaseStore); |
| 2068 | |
| 2069 | delete node; |
| 2070 | } |
| 2071 | |
| 2072 | bool Debug::IsBreakAtReturn(JavaScriptFrame* frame) { |
| 2073 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2074 | HandleScope scope(isolate_); |
| 2075 | |
| 2076 | // Get the executing function in which the debug break occurred. |
| 2077 | Handle<SharedFunctionInfo> shared(frame->function().shared(), isolate_); |
| 2078 | |
| 2079 | // With no debug info there are no break points, so we can't be at a return. |
| 2080 | if (!shared->HasBreakInfo()) return false; |
| 2081 | |
| 2082 | DCHECK(!frame->is_optimized())((void) 0); |
| 2083 | Handle<DebugInfo> debug_info(shared->GetDebugInfo(), isolate_); |
| 2084 | BreakLocation location = BreakLocation::FromFrame(debug_info, frame); |
| 2085 | return location.IsReturn(); |
| 2086 | } |
| 2087 | |
| 2088 | Handle<FixedArray> Debug::GetLoadedScripts() { |
| 2089 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2090 | isolate_->heap()->CollectAllGarbage(Heap::kNoGCFlags, |
| 2091 | GarbageCollectionReason::kDebugger); |
| 2092 | Factory* factory = isolate_->factory(); |
| 2093 | if (!factory->script_list()->IsWeakArrayList()) { |
| 2094 | return factory->empty_fixed_array(); |
| 2095 | } |
| 2096 | Handle<WeakArrayList> array = |
| 2097 | Handle<WeakArrayList>::cast(factory->script_list()); |
| 2098 | Handle<FixedArray> results = factory->NewFixedArray(array->length()); |
| 2099 | int length = 0; |
| 2100 | { |
| 2101 | Script::Iterator iterator(isolate_); |
| 2102 | for (Script script = iterator.Next(); !script.is_null(); |
| 2103 | script = iterator.Next()) { |
| 2104 | if (script.HasValidSource()) results->set(length++, script); |
| 2105 | } |
| 2106 | } |
| 2107 | return FixedArray::ShrinkOrEmpty(isolate_, results, length); |
| 2108 | } |
| 2109 | |
| 2110 | base::Optional<Object> Debug::OnThrow(Handle<Object> exception) { |
| 2111 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2112 | if (in_debug_scope() || ignore_events()) return {}; |
| 2113 | // Temporarily clear any scheduled_exception to allow evaluating |
| 2114 | // JavaScript from the debug event handler. |
| 2115 | HandleScope scope(isolate_); |
| 2116 | Handle<Object> scheduled_exception; |
| 2117 | if (isolate_->has_scheduled_exception()) { |
| 2118 | scheduled_exception = handle(isolate_->scheduled_exception(), isolate_); |
| 2119 | isolate_->clear_scheduled_exception(); |
| 2120 | } |
| 2121 | Handle<Object> maybe_promise = isolate_->GetPromiseOnStackOnThrow(); |
| 2122 | OnException(exception, maybe_promise, |
| 2123 | maybe_promise->IsJSPromise() ? v8::debug::kPromiseRejection |
| 2124 | : v8::debug::kException); |
| 2125 | if (!scheduled_exception.is_null()) { |
| 2126 | isolate_->set_scheduled_exception(*scheduled_exception); |
| 2127 | } |
| 2128 | PrepareStepOnThrow(); |
| 2129 | // If the OnException handler requested termination, then indicated this to |
| 2130 | // our caller Isolate::Throw so it can deal with it immediatelly instead of |
| 2131 | // throwing the original exception. |
| 2132 | if (isolate_->stack_guard()->CheckTerminateExecution()) { |
| 2133 | isolate_->stack_guard()->ClearTerminateExecution(); |
| 2134 | return isolate_->TerminateExecution(); |
| 2135 | } |
| 2136 | return {}; |
| 2137 | } |
| 2138 | |
| 2139 | void Debug::OnPromiseReject(Handle<Object> promise, Handle<Object> value) { |
| 2140 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2141 | if (in_debug_scope() || ignore_events()) return; |
| 2142 | HandleScope scope(isolate_); |
| 2143 | // Check whether the promise has been marked as having triggered a message. |
| 2144 | Handle<Symbol> key = isolate_->factory()->promise_debug_marker_symbol(); |
| 2145 | if (!promise->IsJSObject() || |
| 2146 | JSReceiver::GetDataProperty(isolate_, Handle<JSObject>::cast(promise), |
| 2147 | key) |
| 2148 | ->IsUndefined(isolate_)) { |
| 2149 | OnException(value, promise, v8::debug::kPromiseRejection); |
| 2150 | } |
| 2151 | } |
| 2152 | |
| 2153 | bool Debug::IsExceptionBlackboxed(bool uncaught) { |
| 2154 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2155 | // Uncaught exception is blackboxed if all current frames are blackboxed, |
| 2156 | // caught exception if top frame is blackboxed. |
| 2157 | StackTraceFrameIterator it(isolate_); |
| 2158 | #if V8_ENABLE_WEBASSEMBLY1 |
| 2159 | while (!it.done() && it.is_wasm()) it.Advance(); |
| 2160 | #endif // V8_ENABLE_WEBASSEMBLY |
| 2161 | bool is_top_frame_blackboxed = |
| 2162 | !it.done() ? IsFrameBlackboxed(it.javascript_frame()) : true; |
| 2163 | if (!uncaught || !is_top_frame_blackboxed) return is_top_frame_blackboxed; |
| 2164 | return AllFramesOnStackAreBlackboxed(); |
| 2165 | } |
| 2166 | |
| 2167 | bool Debug::IsFrameBlackboxed(JavaScriptFrame* frame) { |
| 2168 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2169 | HandleScope scope(isolate_); |
| 2170 | std::vector<Handle<SharedFunctionInfo>> infos; |
| 2171 | frame->GetFunctions(&infos); |
| 2172 | for (const auto& info : infos) { |
| 2173 | if (!IsBlackboxed(info)) return false; |
| 2174 | } |
| 2175 | return true; |
| 2176 | } |
| 2177 | |
| 2178 | void Debug::OnException(Handle<Object> exception, Handle<Object> promise, |
| 2179 | v8::debug::ExceptionType exception_type) { |
| 2180 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2181 | // Do not trigger exception event on stack overflow. We cannot perform |
| 2182 | // anything useful for debugging in that situation. |
| 2183 | StackLimitCheck stack_limit_check(isolate_); |
| 2184 | if (stack_limit_check.JsHasOverflowed()) return; |
| 2185 | |
| 2186 | // Return if the event has nowhere to go. |
| 2187 | if (!debug_delegate_) return; |
| 2188 | |
| 2189 | // Return if we are not interested in exception events. |
| 2190 | if (!break_on_exception_ && !break_on_uncaught_exception_) return; |
| 2191 | |
| 2192 | Isolate::CatchType catch_type = isolate_->PredictExceptionCatcher(); |
| 2193 | |
| 2194 | bool uncaught = catch_type == Isolate::NOT_CAUGHT; |
| 2195 | if (promise->IsJSObject()) { |
| 2196 | Handle<JSObject> jsobject = Handle<JSObject>::cast(promise); |
| 2197 | // Mark the promise as already having triggered a message. |
| 2198 | Handle<Symbol> key = isolate_->factory()->promise_debug_marker_symbol(); |
| 2199 | Object::SetProperty(isolate_, jsobject, key, key, StoreOrigin::kMaybeKeyed, |
| 2200 | Just(ShouldThrow::kThrowOnError)) |
| 2201 | .Assert(); |
| 2202 | // Check whether the promise reject is considered an uncaught exception. |
| 2203 | if (jsobject->IsJSPromise()) { |
| 2204 | Handle<JSPromise> jspromise = Handle<JSPromise>::cast(jsobject); |
| 2205 | |
| 2206 | // Ignore the exception if the promise was marked as silent |
| 2207 | if (jspromise->is_silent()) return; |
| 2208 | |
| 2209 | uncaught = !isolate_->PromiseHasUserDefinedRejectHandler(jspromise); |
| 2210 | } else { |
| 2211 | uncaught = true; |
| 2212 | } |
| 2213 | } |
| 2214 | |
| 2215 | // Return if the exception is caught and we only care about uncaught |
| 2216 | // exceptions. |
| 2217 | if (!uncaught && !break_on_exception_) { |
| 2218 | DCHECK(break_on_uncaught_exception_)((void) 0); |
| 2219 | return; |
| 2220 | } |
| 2221 | |
| 2222 | { |
| 2223 | JavaScriptFrameIterator it(isolate_); |
| 2224 | // Check whether the top frame is blackboxed or the break location is muted. |
| 2225 | if (!it.done() && (IsMutedAtCurrentLocation(it.frame()) || |
| 2226 | IsExceptionBlackboxed(uncaught))) { |
| 2227 | return; |
| 2228 | } |
| 2229 | if (it.done()) return; // Do not trigger an event with an empty stack. |
| 2230 | } |
| 2231 | |
| 2232 | DebugScope debug_scope(this); |
| 2233 | HandleScope scope(isolate_); |
| 2234 | DisableBreak no_recursive_break(this); |
| 2235 | |
| 2236 | { |
| 2237 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebuggerCallback); |
| 2238 | Handle<Context> native_context(isolate_->native_context()); |
| 2239 | debug_delegate_->ExceptionThrown( |
| 2240 | v8::Utils::ToLocal(native_context), v8::Utils::ToLocal(exception), |
| 2241 | v8::Utils::ToLocal(promise), uncaught, exception_type); |
| 2242 | } |
| 2243 | } |
| 2244 | |
| 2245 | void Debug::OnDebugBreak(Handle<FixedArray> break_points_hit, |
| 2246 | StepAction lastStepAction, |
| 2247 | v8::debug::BreakReasons break_reasons) { |
| 2248 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2249 | DCHECK(!break_points_hit.is_null())((void) 0); |
| 2250 | // The caller provided for DebugScope. |
| 2251 | AssertDebugContext(); |
| 2252 | // Bail out if there is no listener for this event |
| 2253 | if (ignore_events()) return; |
| 2254 | |
| 2255 | #ifdef DEBUG |
| 2256 | PrintBreakLocation(); |
| 2257 | #endif // DEBUG |
| 2258 | |
| 2259 | if (!debug_delegate_) return; |
| 2260 | DCHECK(in_debug_scope())((void) 0); |
| 2261 | HandleScope scope(isolate_); |
| 2262 | DisableBreak no_recursive_break(this); |
| 2263 | |
| 2264 | if ((lastStepAction == StepAction::StepOver || |
| 2265 | lastStepAction == StepAction::StepInto) && |
| 2266 | ShouldBeSkipped()) { |
| 2267 | PrepareStep(lastStepAction); |
| 2268 | return; |
| 2269 | } |
| 2270 | |
| 2271 | std::vector<int> inspector_break_points_hit; |
| 2272 | // This array contains breakpoints installed using JS debug API. |
| 2273 | for (int i = 0; i < break_points_hit->length(); ++i) { |
| 2274 | BreakPoint break_point = BreakPoint::cast(break_points_hit->get(i)); |
| 2275 | inspector_break_points_hit.push_back(break_point.id()); |
| 2276 | } |
| 2277 | { |
| 2278 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebuggerCallback); |
| 2279 | Handle<Context> native_context(isolate_->native_context()); |
| 2280 | if (lastStepAction != StepAction::StepNone) |
| 2281 | break_reasons.Add(debug::BreakReason::kStep); |
| 2282 | debug_delegate_->BreakProgramRequested(v8::Utils::ToLocal(native_context), |
| 2283 | inspector_break_points_hit, |
| 2284 | break_reasons); |
| 2285 | } |
| 2286 | } |
| 2287 | |
| 2288 | namespace { |
| 2289 | debug::Location GetDebugLocation(Handle<Script> script, int source_position) { |
| 2290 | Script::PositionInfo info; |
| 2291 | Script::GetPositionInfo(script, source_position, &info, Script::WITH_OFFSET); |
| 2292 | // V8 provides ScriptCompiler::CompileFunction method which takes |
| 2293 | // expression and compile it as anonymous function like (function() .. |
| 2294 | // expression ..). To produce correct locations for stmts inside of this |
| 2295 | // expression V8 compile this function with negative offset. Instead of stmt |
| 2296 | // position blackboxing use function start position which is negative in |
| 2297 | // described case. |
| 2298 | return debug::Location(std::max(info.line, 0), std::max(info.column, 0)); |
| 2299 | } |
| 2300 | } // namespace |
| 2301 | |
| 2302 | bool Debug::IsBlackboxed(Handle<SharedFunctionInfo> shared) { |
| 2303 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2304 | if (!debug_delegate_) return !shared->IsSubjectToDebugging(); |
| 2305 | Handle<DebugInfo> debug_info = GetOrCreateDebugInfo(shared); |
| 2306 | if (!debug_info->computed_debug_is_blackboxed()) { |
| 2307 | bool is_blackboxed = |
| 2308 | !shared->IsSubjectToDebugging() || !shared->script().IsScript(); |
| 2309 | if (!is_blackboxed) { |
| 2310 | SuppressDebug while_processing(this); |
| 2311 | HandleScope handle_scope(isolate_); |
| 2312 | PostponeInterruptsScope no_interrupts(isolate_); |
| 2313 | DisableBreak no_recursive_break(this); |
| 2314 | DCHECK(shared->script().IsScript())((void) 0); |
| 2315 | Handle<Script> script(Script::cast(shared->script()), isolate_); |
| 2316 | DCHECK(script->IsUserJavaScript())((void) 0); |
| 2317 | debug::Location start = GetDebugLocation(script, shared->StartPosition()); |
| 2318 | debug::Location end = GetDebugLocation(script, shared->EndPosition()); |
| 2319 | { |
| 2320 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebuggerCallback); |
| 2321 | is_blackboxed = debug_delegate_->IsFunctionBlackboxed( |
| 2322 | ToApiHandle<debug::Script>(script), start, end); |
| 2323 | } |
| 2324 | } |
| 2325 | debug_info->set_debug_is_blackboxed(is_blackboxed); |
| 2326 | debug_info->set_computed_debug_is_blackboxed(true); |
| 2327 | } |
| 2328 | return debug_info->debug_is_blackboxed(); |
| 2329 | } |
| 2330 | |
| 2331 | bool Debug::ShouldBeSkipped() { |
| 2332 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2333 | SuppressDebug while_processing(this); |
| 2334 | PostponeInterruptsScope no_interrupts(isolate_); |
| 2335 | DisableBreak no_recursive_break(this); |
| 2336 | |
| 2337 | StackTraceFrameIterator iterator(isolate_); |
| 2338 | FrameSummary summary = iterator.GetTopValidFrame(); |
| 2339 | Handle<Object> script_obj = summary.script(); |
| 2340 | if (!script_obj->IsScript()) return false; |
| 2341 | |
| 2342 | Handle<Script> script = Handle<Script>::cast(script_obj); |
| 2343 | summary.EnsureSourcePositionsAvailable(); |
| 2344 | int source_position = summary.SourcePosition(); |
| 2345 | int line = Script::GetLineNumber(script, source_position); |
| 2346 | int column = Script::GetColumnNumber(script, source_position); |
| 2347 | |
| 2348 | { |
| 2349 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebuggerCallback); |
| 2350 | return debug_delegate_->ShouldBeSkipped(ToApiHandle<debug::Script>(script), |
| 2351 | line, column); |
| 2352 | } |
| 2353 | } |
| 2354 | |
| 2355 | bool Debug::AllFramesOnStackAreBlackboxed() { |
| 2356 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2357 | HandleScope scope(isolate_); |
| 2358 | for (StackTraceFrameIterator it(isolate_); !it.done(); it.Advance()) { |
| 2359 | if (!it.is_javascript()) continue; |
| 2360 | if (!IsFrameBlackboxed(it.javascript_frame())) return false; |
| 2361 | } |
| 2362 | return true; |
| 2363 | } |
| 2364 | |
| 2365 | bool Debug::CanBreakAtEntry(Handle<SharedFunctionInfo> shared) { |
| 2366 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2367 | // Allow break at entry for builtin functions. |
| 2368 | if (shared->native() || shared->IsApiFunction()) { |
| 2369 | // Functions that are subject to debugging can have regular breakpoints. |
| 2370 | DCHECK(!shared->IsSubjectToDebugging())((void) 0); |
| 2371 | return true; |
| 2372 | } |
| 2373 | return false; |
| 2374 | } |
| 2375 | |
| 2376 | bool Debug::SetScriptSource(Handle<Script> script, Handle<String> source, |
| 2377 | bool preview, debug::LiveEditResult* result) { |
| 2378 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2379 | DebugScope debug_scope(this); |
| 2380 | feature_tracker()->Track(DebugFeatureTracker::kLiveEdit); |
| 2381 | running_live_edit_ = true; |
| 2382 | LiveEdit::PatchScript(isolate_, script, source, preview, result); |
| 2383 | running_live_edit_ = false; |
| 2384 | return result->status == debug::LiveEditResult::OK; |
| 2385 | } |
| 2386 | |
| 2387 | void Debug::OnCompileError(Handle<Script> script) { |
| 2388 | ProcessCompileEvent(true, script); |
| 2389 | } |
| 2390 | |
| 2391 | void Debug::OnAfterCompile(Handle<Script> script) { |
| 2392 | ProcessCompileEvent(false, script); |
| 2393 | } |
| 2394 | |
| 2395 | void Debug::ProcessCompileEvent(bool has_compile_error, Handle<Script> script) { |
| 2396 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2397 | // Ignore temporary scripts. |
| 2398 | if (script->id() == Script::kTemporaryScriptId) return; |
| 2399 | // TODO(kozyatinskiy): teach devtools to work with liveedit scripts better |
| 2400 | // first and then remove this fast return. |
| 2401 | if (running_live_edit_) return; |
| 2402 | // Attach the correct debug id to the script. The debug id is used by the |
| 2403 | // inspector to filter scripts by native context. |
| 2404 | script->set_context_data(isolate_->native_context()->debug_context_id()); |
| 2405 | if (ignore_events()) return; |
| 2406 | #if V8_ENABLE_WEBASSEMBLY1 |
| 2407 | if (!script->IsUserJavaScript() && script->type() != i::Script::TYPE_WASM) { |
| 2408 | return; |
| 2409 | } |
| 2410 | #else |
| 2411 | if (!script->IsUserJavaScript()) return; |
| 2412 | #endif // V8_ENABLE_WEBASSEMBLY |
| 2413 | if (!debug_delegate_) return; |
| 2414 | SuppressDebug while_processing(this); |
| 2415 | DebugScope debug_scope(this); |
| 2416 | HandleScope scope(isolate_); |
| 2417 | DisableBreak no_recursive_break(this); |
| 2418 | AllowJavascriptExecution allow_script(isolate_); |
| 2419 | { |
| 2420 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebuggerCallback); |
| 2421 | debug_delegate_->ScriptCompiled(ToApiHandle<debug::Script>(script), |
| 2422 | running_live_edit_, has_compile_error); |
| 2423 | } |
| 2424 | } |
| 2425 | |
| 2426 | int Debug::CurrentFrameCount() { |
| 2427 | StackTraceFrameIterator it(isolate_); |
| 2428 | if (break_frame_id() != StackFrameId::NO_ID) { |
| 2429 | // Skip to break frame. |
| 2430 | DCHECK(in_debug_scope())((void) 0); |
| 2431 | while (!it.done() && it.frame()->id() != break_frame_id()) it.Advance(); |
| 2432 | } |
| 2433 | int counter = 0; |
| 2434 | for (; !it.done(); it.Advance()) { |
| 2435 | counter += it.FrameFunctionCount(); |
| 2436 | } |
| 2437 | return counter; |
| 2438 | } |
| 2439 | |
| 2440 | void Debug::SetDebugDelegate(debug::DebugDelegate* delegate) { |
| 2441 | debug_delegate_ = delegate; |
| 2442 | UpdateState(); |
| 2443 | } |
| 2444 | |
| 2445 | void Debug::UpdateState() { |
| 2446 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2447 | bool is_active = debug_delegate_ != nullptr; |
| 2448 | if (is_active == is_active_) return; |
| 2449 | if (is_active) { |
| 2450 | // Note that the debug context could have already been loaded to |
| 2451 | // bootstrap test cases. |
| 2452 | isolate_->compilation_cache()->DisableScriptAndEval(); |
| 2453 | isolate_->CollectSourcePositionsForAllBytecodeArrays(); |
| 2454 | is_active = true; |
| 2455 | feature_tracker()->Track(DebugFeatureTracker::kActive); |
| 2456 | } else { |
| 2457 | isolate_->compilation_cache()->EnableScriptAndEval(); |
| 2458 | Unload(); |
| 2459 | } |
| 2460 | is_active_ = is_active; |
| 2461 | isolate_->PromiseHookStateUpdated(); |
| 2462 | } |
| 2463 | |
| 2464 | void Debug::UpdateHookOnFunctionCall() { |
| 2465 | STATIC_ASSERT(LastStepAction == StepInto)static_assert(LastStepAction == StepInto, "LastStepAction == StepInto" ); |
| 2466 | hook_on_function_call_ = |
| 2467 | thread_local_.last_step_action_ == StepInto || |
| 2468 | isolate_->debug_execution_mode() == DebugInfo::kSideEffects || |
| 2469 | thread_local_.break_on_next_function_call_; |
| 2470 | } |
| 2471 | |
| 2472 | void Debug::HandleDebugBreak(IgnoreBreakMode ignore_break_mode, |
| 2473 | v8::debug::BreakReasons break_reasons) { |
| 2474 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2475 | // Ignore debug break during bootstrapping. |
| 2476 | if (isolate_->bootstrapper()->IsActive()) return; |
| 2477 | // Just continue if breaks are disabled. |
| 2478 | if (break_disabled()) return; |
| 2479 | // Ignore debug break if debugger is not active. |
| 2480 | if (!is_active()) return; |
| 2481 | |
| 2482 | StackLimitCheck check(isolate_); |
| 2483 | if (check.HasOverflowed()) return; |
| 2484 | |
| 2485 | HandleScope scope(isolate_); |
| 2486 | MaybeHandle<FixedArray> break_points; |
| 2487 | { |
| 2488 | JavaScriptFrameIterator it(isolate_); |
| 2489 | DCHECK(!it.done())((void) 0); |
| 2490 | Object fun = it.frame()->function(); |
| 2491 | if (fun.IsJSFunction()) { |
| 2492 | Handle<JSFunction> function(JSFunction::cast(fun), isolate_); |
| 2493 | // Don't stop in builtin and blackboxed functions. |
| 2494 | Handle<SharedFunctionInfo> shared(function->shared(), isolate_); |
| 2495 | bool ignore_break = ignore_break_mode == kIgnoreIfTopFrameBlackboxed |
| 2496 | ? IsBlackboxed(shared) |
| 2497 | : AllFramesOnStackAreBlackboxed(); |
| 2498 | if (ignore_break) return; |
| 2499 | if (function->shared().HasBreakInfo()) { |
| 2500 | Handle<DebugInfo> debug_info(function->shared().GetDebugInfo(), |
| 2501 | isolate_); |
| 2502 | // Enter the debugger. |
| 2503 | DebugScope debug_scope(this); |
| 2504 | |
| 2505 | std::vector<BreakLocation> break_locations; |
| 2506 | BreakLocation::AllAtCurrentStatement(debug_info, it.frame(), |
| 2507 | &break_locations); |
| 2508 | |
| 2509 | for (size_t i = 0; i < break_locations.size(); i++) { |
| 2510 | if (IsBreakOnInstrumentation(debug_info, break_locations[i])) { |
| 2511 | OnInstrumentationBreak(); |
| 2512 | break; |
| 2513 | } |
| 2514 | } |
| 2515 | |
| 2516 | bool has_break_points; |
| 2517 | break_points = CheckBreakPointsForLocations(debug_info, break_locations, |
| 2518 | &has_break_points); |
| 2519 | bool is_muted = has_break_points && break_points.is_null(); |
| 2520 | // If we get to this point, a break was triggered because e.g. of a |
| 2521 | // debugger statement, an assert, .. . However, we do not stop if this |
| 2522 | // position "is muted", which happens if a conditional breakpoint at |
| 2523 | // this point evaluates to false. |
| 2524 | if (is_muted) return; |
| 2525 | } |
| 2526 | } |
| 2527 | } |
| 2528 | |
| 2529 | StepAction lastStepAction = last_step_action(); |
| 2530 | |
| 2531 | // Clear stepping to avoid duplicate breaks. |
| 2532 | ClearStepping(); |
| 2533 | |
| 2534 | DebugScope debug_scope(this); |
| 2535 | OnDebugBreak(break_points.is_null() ? isolate_->factory()->empty_fixed_array() |
| 2536 | : break_points.ToHandleChecked(), |
| 2537 | lastStepAction, break_reasons); |
| 2538 | } |
| 2539 | |
| 2540 | #ifdef DEBUG |
| 2541 | void Debug::PrintBreakLocation() { |
| 2542 | if (!FLAG_print_break_location) return; |
| 2543 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2544 | HandleScope scope(isolate_); |
| 2545 | StackTraceFrameIterator iterator(isolate_); |
| 2546 | if (iterator.done()) return; |
| 2547 | CommonFrame* frame = iterator.frame(); |
| 2548 | std::vector<FrameSummary> frames; |
| 2549 | frame->Summarize(&frames); |
| 2550 | int inlined_frame_index = static_cast<int>(frames.size() - 1); |
| 2551 | FrameInspector inspector(frame, inlined_frame_index, isolate_); |
| 2552 | int source_position = inspector.GetSourcePosition(); |
| 2553 | Handle<Object> script_obj = inspector.GetScript(); |
| 2554 | PrintF("[debug] break in function '"); |
| 2555 | inspector.GetFunctionName()->PrintOn(stdoutstdout); |
| 2556 | PrintF("'.\n"); |
| 2557 | if (script_obj->IsScript()) { |
| 2558 | Handle<Script> script = Handle<Script>::cast(script_obj); |
| 2559 | Handle<String> source(String::cast(script->source()), isolate_); |
| 2560 | Script::InitLineEnds(isolate_, script); |
| 2561 | int line = |
| 2562 | Script::GetLineNumber(script, source_position) - script->line_offset(); |
| 2563 | int column = Script::GetColumnNumber(script, source_position) - |
| 2564 | (line == 0 ? script->column_offset() : 0); |
| 2565 | Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends()), |
| 2566 | isolate_); |
| 2567 | int line_start = line == 0 ? 0 : Smi::ToInt(line_ends->get(line - 1)) + 1; |
| 2568 | int line_end = Smi::ToInt(line_ends->get(line)); |
| 2569 | DisallowGarbageCollection no_gc; |
| 2570 | String::FlatContent content = source->GetFlatContent(no_gc); |
| 2571 | if (content.IsOneByte()) { |
| 2572 | PrintF("[debug] %.*s\n", line_end - line_start, |
| 2573 | content.ToOneByteVector().begin() + line_start); |
| 2574 | PrintF("[debug] "); |
| 2575 | for (int i = 0; i < column; i++) PrintF(" "); |
| 2576 | PrintF("^\n"); |
| 2577 | } else { |
| 2578 | PrintF("[debug] at line %d column %d\n", line, column); |
| 2579 | } |
| 2580 | } |
| 2581 | } |
| 2582 | #endif // DEBUG |
| 2583 | |
| 2584 | DebugScope::DebugScope(Debug* debug) |
| 2585 | : debug_(debug), |
| 2586 | prev_(reinterpret_cast<DebugScope*>( |
| 2587 | base::Relaxed_Load(&debug->thread_local_.current_debug_scope_))), |
| 2588 | no_interrupts_(debug_->isolate_) { |
| 2589 | // Link recursive debugger entry. |
| 2590 | base::Relaxed_Store(&debug_->thread_local_.current_debug_scope_, |
| 2591 | reinterpret_cast<base::AtomicWord>(this)); |
| 2592 | // Store the previous frame id and return value. |
| 2593 | break_frame_id_ = debug_->break_frame_id(); |
| 2594 | |
| 2595 | // Create the new break info. If there is no proper frames there is no break |
| 2596 | // frame id. |
| 2597 | StackTraceFrameIterator it(isolate()); |
| 2598 | bool has_frames = !it.done(); |
| 2599 | debug_->thread_local_.break_frame_id_ = |
| 2600 | has_frames ? it.frame()->id() : StackFrameId::NO_ID; |
| 2601 | |
| 2602 | debug_->UpdateState(); |
| 2603 | } |
| 2604 | |
| 2605 | void DebugScope::set_terminate_on_resume() { terminate_on_resume_ = true; } |
| 2606 | |
| 2607 | DebugScope::~DebugScope() { |
| 2608 | // Terminate on resume must have been handled by retrieving it, if this is |
| 2609 | // the outer scope. |
| 2610 | if (terminate_on_resume_) { |
| 2611 | if (!prev_) { |
| 2612 | debug_->isolate_->stack_guard()->RequestTerminateExecution(); |
| 2613 | } else { |
| 2614 | prev_->set_terminate_on_resume(); |
| 2615 | } |
| 2616 | } |
| 2617 | // Leaving this debugger entry. |
| 2618 | base::Relaxed_Store(&debug_->thread_local_.current_debug_scope_, |
| 2619 | reinterpret_cast<base::AtomicWord>(prev_)); |
| 2620 | |
| 2621 | // Restore to the previous break state. |
| 2622 | debug_->thread_local_.break_frame_id_ = break_frame_id_; |
| 2623 | |
| 2624 | debug_->UpdateState(); |
| 2625 | } |
| 2626 | |
| 2627 | ReturnValueScope::ReturnValueScope(Debug* debug) : debug_(debug) { |
| 2628 | return_value_ = debug_->return_value_handle(); |
| 2629 | } |
| 2630 | |
| 2631 | ReturnValueScope::~ReturnValueScope() { |
| 2632 | debug_->set_return_value(*return_value_); |
| 2633 | } |
| 2634 | |
| 2635 | void Debug::UpdateDebugInfosForExecutionMode() { |
| 2636 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2637 | // Walk all debug infos and update their execution mode if it is different |
| 2638 | // from the isolate execution mode. |
| 2639 | DebugInfoListNode* current = debug_info_list_; |
| 2640 | while (current != nullptr) { |
| 2641 | Handle<DebugInfo> debug_info = current->debug_info(); |
| 2642 | if (debug_info->HasInstrumentedBytecodeArray() && |
| 2643 | debug_info->DebugExecutionMode() != isolate_->debug_execution_mode()) { |
| 2644 | DCHECK(debug_info->shared().HasBytecodeArray())((void) 0); |
| 2645 | if (isolate_->debug_execution_mode() == DebugInfo::kBreakpoints) { |
| 2646 | ClearSideEffectChecks(debug_info); |
| 2647 | ApplyBreakPoints(debug_info); |
| 2648 | } else { |
| 2649 | ClearBreakPoints(debug_info); |
| 2650 | ApplySideEffectChecks(debug_info); |
| 2651 | } |
| 2652 | } |
| 2653 | current = current->next(); |
| 2654 | } |
| 2655 | } |
| 2656 | |
| 2657 | void Debug::SetTerminateOnResume() { |
| 2658 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2659 | DebugScope* scope = reinterpret_cast<DebugScope*>( |
| 2660 | base::Acquire_Load(&thread_local_.current_debug_scope_)); |
| 2661 | CHECK_NOT_NULL(scope)do { if ((__builtin_expect(!!(!((scope) != nullptr)), 0))) { V8_Fatal ("Check failed: %s.", "(scope) != nullptr"); } } while (false ); |
| 2662 | scope->set_terminate_on_resume(); |
| 2663 | } |
| 2664 | |
| 2665 | void Debug::StartSideEffectCheckMode() { |
| 2666 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2667 | DCHECK(isolate_->debug_execution_mode() != DebugInfo::kSideEffects)((void) 0); |
| 2668 | isolate_->set_debug_execution_mode(DebugInfo::kSideEffects); |
| 2669 | UpdateHookOnFunctionCall(); |
| 2670 | side_effect_check_failed_ = false; |
| 2671 | |
| 2672 | DCHECK(!temporary_objects_)((void) 0); |
| 2673 | temporary_objects_.reset(new TemporaryObjectsTracker()); |
| 2674 | isolate_->heap()->AddHeapObjectAllocationTracker(temporary_objects_.get()); |
| 2675 | Handle<FixedArray> array(isolate_->native_context()->regexp_last_match_info(), |
| 2676 | isolate_); |
| 2677 | regexp_match_info_ = |
| 2678 | Handle<RegExpMatchInfo>::cast(isolate_->factory()->CopyFixedArray(array)); |
| 2679 | |
| 2680 | // Update debug infos to have correct execution mode. |
| 2681 | UpdateDebugInfosForExecutionMode(); |
| 2682 | } |
| 2683 | |
| 2684 | void Debug::StopSideEffectCheckMode() { |
| 2685 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2686 | DCHECK(isolate_->debug_execution_mode() == DebugInfo::kSideEffects)((void) 0); |
| 2687 | if (side_effect_check_failed_) { |
| 2688 | DCHECK(isolate_->has_pending_exception())((void) 0); |
| 2689 | DCHECK_EQ(ReadOnlyRoots(isolate_).termination_exception(),((void) 0) |
| 2690 | isolate_->pending_exception())((void) 0); |
| 2691 | // Convert the termination exception into a regular exception. |
| 2692 | isolate_->CancelTerminateExecution(); |
| 2693 | isolate_->Throw(*isolate_->factory()->NewEvalError( |
| 2694 | MessageTemplate::kNoSideEffectDebugEvaluate)); |
| 2695 | } |
| 2696 | isolate_->set_debug_execution_mode(DebugInfo::kBreakpoints); |
| 2697 | UpdateHookOnFunctionCall(); |
| 2698 | side_effect_check_failed_ = false; |
| 2699 | |
| 2700 | DCHECK(temporary_objects_)((void) 0); |
| 2701 | isolate_->heap()->RemoveHeapObjectAllocationTracker(temporary_objects_.get()); |
| 2702 | temporary_objects_.reset(); |
| 2703 | isolate_->native_context()->set_regexp_last_match_info(*regexp_match_info_); |
| 2704 | regexp_match_info_ = Handle<RegExpMatchInfo>::null(); |
| 2705 | |
| 2706 | // Update debug infos to have correct execution mode. |
| 2707 | UpdateDebugInfosForExecutionMode(); |
| 2708 | } |
| 2709 | |
| 2710 | void Debug::ApplySideEffectChecks(Handle<DebugInfo> debug_info) { |
| 2711 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2712 | DCHECK(debug_info->HasInstrumentedBytecodeArray())((void) 0); |
| 2713 | Handle<BytecodeArray> debug_bytecode(debug_info->DebugBytecodeArray(), |
| 2714 | isolate_); |
| 2715 | DebugEvaluate::ApplySideEffectChecks(debug_bytecode); |
| 2716 | debug_info->SetDebugExecutionMode(DebugInfo::kSideEffects); |
| 2717 | } |
| 2718 | |
| 2719 | void Debug::ClearSideEffectChecks(Handle<DebugInfo> debug_info) { |
| 2720 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2721 | DCHECK(debug_info->HasInstrumentedBytecodeArray())((void) 0); |
| 2722 | Handle<BytecodeArray> debug_bytecode(debug_info->DebugBytecodeArray(), |
| 2723 | isolate_); |
| 2724 | Handle<BytecodeArray> original(debug_info->OriginalBytecodeArray(), isolate_); |
| 2725 | for (interpreter::BytecodeArrayIterator it(debug_bytecode); !it.done(); |
| 2726 | it.Advance()) { |
| 2727 | // Restore from original. This may copy only the scaling prefix, which is |
| 2728 | // correct, since we patch scaling prefixes to debug breaks if exists. |
| 2729 | debug_bytecode->set(it.current_offset(), |
| 2730 | original->get(it.current_offset())); |
| 2731 | } |
| 2732 | } |
| 2733 | |
| 2734 | bool Debug::PerformSideEffectCheck(Handle<JSFunction> function, |
| 2735 | Handle<Object> receiver) { |
| 2736 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2737 | DCHECK_EQ(isolate_->debug_execution_mode(), DebugInfo::kSideEffects)((void) 0); |
| 2738 | DisallowJavascriptExecution no_js(isolate_); |
| 2739 | IsCompiledScope is_compiled_scope( |
| 2740 | function->shared().is_compiled_scope(isolate_)); |
| 2741 | if (!function->is_compiled() && |
| 2742 | !Compiler::Compile(isolate_, function, Compiler::KEEP_EXCEPTION, |
| 2743 | &is_compiled_scope)) { |
| 2744 | return false; |
| 2745 | } |
| 2746 | DCHECK(is_compiled_scope.is_compiled())((void) 0); |
| 2747 | Handle<SharedFunctionInfo> shared(function->shared(), isolate_); |
| 2748 | Handle<DebugInfo> debug_info = GetOrCreateDebugInfo(shared); |
| 2749 | DebugInfo::SideEffectState side_effect_state = |
| 2750 | debug_info->GetSideEffectState(isolate_); |
| 2751 | switch (side_effect_state) { |
| 2752 | case DebugInfo::kHasSideEffects: |
| 2753 | if (FLAG_trace_side_effect_free_debug_evaluate) { |
| 2754 | PrintF("[debug-evaluate] Function %s failed side effect check.\n", |
| 2755 | function->shared().DebugNameCStr().get()); |
| 2756 | } |
| 2757 | side_effect_check_failed_ = true; |
| 2758 | // Throw an uncatchable termination exception. |
| 2759 | isolate_->TerminateExecution(); |
| 2760 | return false; |
| 2761 | case DebugInfo::kRequiresRuntimeChecks: { |
| 2762 | if (!shared->HasBytecodeArray()) { |
| 2763 | return PerformSideEffectCheckForObject(receiver); |
| 2764 | } |
| 2765 | // If function has bytecode array then prepare function for debug |
| 2766 | // execution to perform runtime side effect checks. |
| 2767 | DCHECK(shared->is_compiled())((void) 0); |
| 2768 | PrepareFunctionForDebugExecution(shared); |
| 2769 | ApplySideEffectChecks(debug_info); |
| 2770 | return true; |
| 2771 | } |
| 2772 | case DebugInfo::kHasNoSideEffect: |
| 2773 | return true; |
| 2774 | case DebugInfo::kNotComputed: |
| 2775 | default: |
| 2776 | UNREACHABLE()V8_Fatal("unreachable code"); |
| 2777 | } |
| 2778 | } |
| 2779 | |
| 2780 | Handle<Object> Debug::return_value_handle() { |
| 2781 | return handle(thread_local_.return_value_, isolate_); |
| 2782 | } |
| 2783 | |
| 2784 | bool Debug::PerformSideEffectCheckForCallback( |
| 2785 | Handle<Object> callback_info, Handle<Object> receiver, |
| 2786 | Debug::AccessorKind accessor_kind) { |
| 2787 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2788 | DCHECK_EQ(!receiver.is_null(), callback_info->IsAccessorInfo())((void) 0); |
| 2789 | DCHECK_EQ(isolate_->debug_execution_mode(), DebugInfo::kSideEffects)((void) 0); |
| 2790 | if (!callback_info.is_null() && callback_info->IsCallHandlerInfo() && |
| 2791 | i::CallHandlerInfo::cast(*callback_info).NextCallHasNoSideEffect()) { |
| 2792 | return true; |
| 2793 | } |
| 2794 | // TODO(7515): always pass a valid callback info object. |
| 2795 | if (!callback_info.is_null()) { |
| 2796 | if (callback_info->IsAccessorInfo()) { |
| 2797 | // List of allowlisted internal accessors can be found in accessors.h. |
| 2798 | AccessorInfo info = AccessorInfo::cast(*callback_info); |
| 2799 | DCHECK_NE(kNotAccessor, accessor_kind)((void) 0); |
| 2800 | switch (accessor_kind == kSetter ? info.setter_side_effect_type() |
| 2801 | : info.getter_side_effect_type()) { |
| 2802 | case SideEffectType::kHasNoSideEffect: |
| 2803 | // We do not support setter accessors with no side effects, since |
| 2804 | // calling set accessors go through a store bytecode. Store bytecodes |
| 2805 | // are considered to cause side effects (to non-temporary objects). |
| 2806 | DCHECK_NE(kSetter, accessor_kind)((void) 0); |
| 2807 | return true; |
| 2808 | case SideEffectType::kHasSideEffectToReceiver: |
| 2809 | DCHECK(!receiver.is_null())((void) 0); |
| 2810 | if (PerformSideEffectCheckForObject(receiver)) return true; |
| 2811 | isolate_->OptionalRescheduleException(false); |
| 2812 | return false; |
| 2813 | case SideEffectType::kHasSideEffect: |
| 2814 | break; |
| 2815 | } |
| 2816 | if (FLAG_trace_side_effect_free_debug_evaluate) { |
| 2817 | PrintF("[debug-evaluate] API Callback '"); |
| 2818 | info.name().ShortPrint(); |
| 2819 | PrintF("' may cause side effect.\n"); |
| 2820 | } |
| 2821 | } else if (callback_info->IsInterceptorInfo()) { |
| 2822 | InterceptorInfo info = InterceptorInfo::cast(*callback_info); |
| 2823 | if (info.has_no_side_effect()) return true; |
| 2824 | if (FLAG_trace_side_effect_free_debug_evaluate) { |
| 2825 | PrintF("[debug-evaluate] API Interceptor may cause side effect.\n"); |
| 2826 | } |
| 2827 | } else if (callback_info->IsCallHandlerInfo()) { |
| 2828 | CallHandlerInfo info = CallHandlerInfo::cast(*callback_info); |
| 2829 | if (info.IsSideEffectFreeCallHandlerInfo()) return true; |
| 2830 | if (FLAG_trace_side_effect_free_debug_evaluate) { |
| 2831 | PrintF("[debug-evaluate] API CallHandlerInfo may cause side effect.\n"); |
| 2832 | } |
| 2833 | } |
| 2834 | } |
| 2835 | side_effect_check_failed_ = true; |
| 2836 | // Throw an uncatchable termination exception. |
| 2837 | isolate_->TerminateExecution(); |
| 2838 | isolate_->OptionalRescheduleException(false); |
| 2839 | return false; |
| 2840 | } |
| 2841 | |
| 2842 | bool Debug::PerformSideEffectCheckAtBytecode(InterpretedFrame* frame) { |
| 2843 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2844 | using interpreter::Bytecode; |
| 2845 | |
| 2846 | DCHECK_EQ(isolate_->debug_execution_mode(), DebugInfo::kSideEffects)((void) 0); |
| 2847 | SharedFunctionInfo shared = frame->function().shared(); |
| 2848 | BytecodeArray bytecode_array = shared.GetBytecodeArray(isolate_); |
| 2849 | int offset = frame->GetBytecodeOffset(); |
| 2850 | interpreter::BytecodeArrayIterator bytecode_iterator( |
| 2851 | handle(bytecode_array, isolate_), offset); |
| 2852 | |
| 2853 | Bytecode bytecode = bytecode_iterator.current_bytecode(); |
| 2854 | if (interpreter::Bytecodes::IsCallRuntime(bytecode)) { |
| 2855 | auto id = (bytecode == Bytecode::kInvokeIntrinsic) |
| 2856 | ? bytecode_iterator.GetIntrinsicIdOperand(0) |
| 2857 | : bytecode_iterator.GetRuntimeIdOperand(0); |
| 2858 | if (DebugEvaluate::IsSideEffectFreeIntrinsic(id)) { |
| 2859 | return true; |
| 2860 | } |
| 2861 | side_effect_check_failed_ = true; |
| 2862 | // Throw an uncatchable termination exception. |
| 2863 | isolate_->TerminateExecution(); |
| 2864 | return false; |
| 2865 | } |
| 2866 | interpreter::Register reg; |
| 2867 | switch (bytecode) { |
| 2868 | case Bytecode::kStaCurrentContextSlot: |
| 2869 | reg = interpreter::Register::current_context(); |
| 2870 | break; |
| 2871 | default: |
| 2872 | reg = bytecode_iterator.GetRegisterOperand(0); |
| 2873 | break; |
| 2874 | } |
| 2875 | Handle<Object> object = |
| 2876 | handle(frame->ReadInterpreterRegister(reg.index()), isolate_); |
| 2877 | return PerformSideEffectCheckForObject(object); |
| 2878 | } |
| 2879 | |
| 2880 | bool Debug::PerformSideEffectCheckForObject(Handle<Object> object) { |
| 2881 | RCS_SCOPE(isolate_, RuntimeCallCounterId::kDebugger); |
| 2882 | DCHECK_EQ(isolate_->debug_execution_mode(), DebugInfo::kSideEffects)((void) 0); |
| 2883 | |
| 2884 | // We expect no side-effects for primitives. |
| 2885 | if (object->IsNumber()) return true; |
| 2886 | if (object->IsName()) return true; |
| 2887 | |
| 2888 | if (temporary_objects_->HasObject(Handle<HeapObject>::cast(object))) { |
| 2889 | return true; |
| 2890 | } |
| 2891 | |
| 2892 | if (FLAG_trace_side_effect_free_debug_evaluate) { |
| 2893 | PrintF("[debug-evaluate] failed runtime side effect check.\n"); |
| 2894 | } |
| 2895 | side_effect_check_failed_ = true; |
| 2896 | // Throw an uncatchable termination exception. |
| 2897 | isolate_->TerminateExecution(); |
| 2898 | return false; |
| 2899 | } |
| 2900 | |
| 2901 | void Debug::SetTemporaryObjectTrackingDisabled(bool disabled) { |
| 2902 | if (temporary_objects_) { |
| 2903 | temporary_objects_->disabled = disabled; |
| 2904 | } |
| 2905 | } |
| 2906 | |
| 2907 | bool Debug::GetTemporaryObjectTrackingDisabled() const { |
| 2908 | if (temporary_objects_) { |
| 2909 | return temporary_objects_->disabled; |
| 2910 | } |
| 2911 | return false; |
| 2912 | } |
| 2913 | |
| 2914 | } // namespace internal |
| 2915 | } // namespace v8 |