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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/v8.h" | |
6 | |
7 #include "src/api.h" | |
8 #include "src/arguments.h" | |
9 #include "src/bootstrapper.h" | |
10 #include "src/code-stubs.h" | |
11 #include "src/codegen.h" | |
12 #include "src/compilation-cache.h" | |
13 #include "src/compiler.h" | |
14 #include "src/debug.h" | |
15 #include "src/deoptimizer.h" | |
16 #include "src/execution.h" | |
17 #include "src/full-codegen/full-codegen.h" | |
18 #include "src/global-handles.h" | |
19 #include "src/list.h" | |
20 #include "src/log.h" | |
21 #include "src/messages.h" | |
22 #include "src/snapshot/natives.h" | |
23 | |
24 #include "include/v8-debug.h" | |
25 | |
26 namespace v8 { | |
27 namespace internal { | |
28 | |
29 Debug::Debug(Isolate* isolate) | |
30 : debug_context_(Handle<Context>()), | |
31 event_listener_(Handle<Object>()), | |
32 event_listener_data_(Handle<Object>()), | |
33 message_handler_(NULL), | |
34 command_received_(0), | |
35 command_queue_(isolate->logger(), kQueueInitialSize), | |
36 is_active_(false), | |
37 is_suppressed_(false), | |
38 live_edit_enabled_(true), // TODO(yangguo): set to false by default. | |
39 break_disabled_(false), | |
40 in_debug_event_listener_(false), | |
41 break_on_exception_(false), | |
42 break_on_uncaught_exception_(false), | |
43 script_cache_(NULL), | |
44 debug_info_list_(NULL), | |
45 isolate_(isolate) { | |
46 ThreadInit(); | |
47 } | |
48 | |
49 | |
50 static v8::Local<v8::Context> GetDebugEventContext(Isolate* isolate) { | |
51 Handle<Context> context = isolate->debug()->debugger_entry()->GetContext(); | |
52 // Isolate::context() may have been NULL when "script collected" event | |
53 // occured. | |
54 if (context.is_null()) return v8::Local<v8::Context>(); | |
55 Handle<Context> native_context(context->native_context()); | |
56 return v8::Utils::ToLocal(native_context); | |
57 } | |
58 | |
59 | |
60 BreakLocation::BreakLocation(Handle<DebugInfo> debug_info, RelocInfo* rinfo, | |
61 int position, int statement_position) | |
62 : debug_info_(debug_info), | |
63 pc_offset_(static_cast<int>(rinfo->pc() - debug_info->code()->entry())), | |
64 rmode_(rinfo->rmode()), | |
65 data_(rinfo->data()), | |
66 position_(position), | |
67 statement_position_(statement_position) {} | |
68 | |
69 | |
70 BreakLocation::Iterator::Iterator(Handle<DebugInfo> debug_info, | |
71 BreakLocatorType type) | |
72 : debug_info_(debug_info), | |
73 reloc_iterator_(debug_info->code(), GetModeMask(type)), | |
74 break_index_(-1), | |
75 position_(1), | |
76 statement_position_(1) { | |
77 if (!Done()) Next(); | |
78 } | |
79 | |
80 | |
81 int BreakLocation::Iterator::GetModeMask(BreakLocatorType type) { | |
82 int mask = 0; | |
83 mask |= RelocInfo::ModeMask(RelocInfo::POSITION); | |
84 mask |= RelocInfo::ModeMask(RelocInfo::STATEMENT_POSITION); | |
85 mask |= RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT_AT_RETURN); | |
86 mask |= RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT_AT_CALL); | |
87 mask |= RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT_AT_CONSTRUCT_CALL); | |
88 if (type == ALL_BREAK_LOCATIONS) { | |
89 mask |= RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT_AT_POSITION); | |
90 mask |= RelocInfo::ModeMask(RelocInfo::DEBUGGER_STATEMENT); | |
91 } | |
92 return mask; | |
93 } | |
94 | |
95 | |
96 void BreakLocation::Iterator::Next() { | |
97 DisallowHeapAllocation no_gc; | |
98 DCHECK(!Done()); | |
99 | |
100 // Iterate through reloc info for code and original code stopping at each | |
101 // breakable code target. | |
102 bool first = break_index_ == -1; | |
103 while (!Done()) { | |
104 if (!first) reloc_iterator_.next(); | |
105 first = false; | |
106 if (Done()) return; | |
107 | |
108 // Whenever a statement position or (plain) position is passed update the | |
109 // current value of these. | |
110 if (RelocInfo::IsPosition(rmode())) { | |
111 if (RelocInfo::IsStatementPosition(rmode())) { | |
112 statement_position_ = static_cast<int>( | |
113 rinfo()->data() - debug_info_->shared()->start_position()); | |
114 } | |
115 // Always update the position as we don't want that to be before the | |
116 // statement position. | |
117 position_ = static_cast<int>(rinfo()->data() - | |
118 debug_info_->shared()->start_position()); | |
119 DCHECK(position_ >= 0); | |
120 DCHECK(statement_position_ >= 0); | |
121 continue; | |
122 } | |
123 | |
124 DCHECK(RelocInfo::IsDebugBreakSlot(rmode()) || | |
125 RelocInfo::IsDebuggerStatement(rmode())); | |
126 | |
127 if (RelocInfo::IsDebugBreakSlotAtReturn(rmode())) { | |
128 // Set the positions to the end of the function. | |
129 if (debug_info_->shared()->HasSourceCode()) { | |
130 position_ = debug_info_->shared()->end_position() - | |
131 debug_info_->shared()->start_position() - 1; | |
132 } else { | |
133 position_ = 0; | |
134 } | |
135 statement_position_ = position_; | |
136 } | |
137 | |
138 break; | |
139 } | |
140 break_index_++; | |
141 } | |
142 | |
143 | |
144 // Find the break point at the supplied address, or the closest one before | |
145 // the address. | |
146 BreakLocation BreakLocation::FromAddress(Handle<DebugInfo> debug_info, | |
147 BreakLocatorType type, Address pc) { | |
148 Iterator it(debug_info, type); | |
149 it.SkipTo(BreakIndexFromAddress(debug_info, type, pc)); | |
150 return it.GetBreakLocation(); | |
151 } | |
152 | |
153 | |
154 // Find the break point at the supplied address, or the closest one before | |
155 // the address. | |
156 void BreakLocation::FromAddressSameStatement(Handle<DebugInfo> debug_info, | |
157 BreakLocatorType type, Address pc, | |
158 List<BreakLocation>* result_out) { | |
159 int break_index = BreakIndexFromAddress(debug_info, type, pc); | |
160 Iterator it(debug_info, type); | |
161 it.SkipTo(break_index); | |
162 int statement_position = it.statement_position(); | |
163 while (!it.Done() && it.statement_position() == statement_position) { | |
164 result_out->Add(it.GetBreakLocation()); | |
165 it.Next(); | |
166 } | |
167 } | |
168 | |
169 | |
170 int BreakLocation::BreakIndexFromAddress(Handle<DebugInfo> debug_info, | |
171 BreakLocatorType type, Address pc) { | |
172 // Run through all break points to locate the one closest to the address. | |
173 int closest_break = 0; | |
174 int distance = kMaxInt; | |
175 for (Iterator it(debug_info, type); !it.Done(); it.Next()) { | |
176 // Check if this break point is closer that what was previously found. | |
177 if (it.pc() <= pc && pc - it.pc() < distance) { | |
178 closest_break = it.break_index(); | |
179 distance = static_cast<int>(pc - it.pc()); | |
180 // Check whether we can't get any closer. | |
181 if (distance == 0) break; | |
182 } | |
183 } | |
184 return closest_break; | |
185 } | |
186 | |
187 | |
188 BreakLocation BreakLocation::FromPosition(Handle<DebugInfo> debug_info, | |
189 BreakLocatorType type, int position, | |
190 BreakPositionAlignment alignment) { | |
191 // Run through all break points to locate the one closest to the source | |
192 // position. | |
193 int closest_break = 0; | |
194 int distance = kMaxInt; | |
195 | |
196 for (Iterator it(debug_info, type); !it.Done(); it.Next()) { | |
197 int next_position; | |
198 if (alignment == STATEMENT_ALIGNED) { | |
199 next_position = it.statement_position(); | |
200 } else { | |
201 DCHECK(alignment == BREAK_POSITION_ALIGNED); | |
202 next_position = it.position(); | |
203 } | |
204 if (position <= next_position && next_position - position < distance) { | |
205 closest_break = it.break_index(); | |
206 distance = next_position - position; | |
207 // Check whether we can't get any closer. | |
208 if (distance == 0) break; | |
209 } | |
210 } | |
211 | |
212 Iterator it(debug_info, type); | |
213 it.SkipTo(closest_break); | |
214 return it.GetBreakLocation(); | |
215 } | |
216 | |
217 | |
218 void BreakLocation::SetBreakPoint(Handle<Object> break_point_object) { | |
219 // If there is not already a real break point here patch code with debug | |
220 // break. | |
221 if (!HasBreakPoint()) SetDebugBreak(); | |
222 DCHECK(IsDebugBreak() || IsDebuggerStatement()); | |
223 // Set the break point information. | |
224 DebugInfo::SetBreakPoint(debug_info_, pc_offset_, position_, | |
225 statement_position_, break_point_object); | |
226 } | |
227 | |
228 | |
229 void BreakLocation::ClearBreakPoint(Handle<Object> break_point_object) { | |
230 // Clear the break point information. | |
231 DebugInfo::ClearBreakPoint(debug_info_, pc_offset_, break_point_object); | |
232 // If there are no more break points here remove the debug break. | |
233 if (!HasBreakPoint()) { | |
234 ClearDebugBreak(); | |
235 DCHECK(!IsDebugBreak()); | |
236 } | |
237 } | |
238 | |
239 | |
240 void BreakLocation::SetOneShot() { | |
241 // Debugger statement always calls debugger. No need to modify it. | |
242 if (IsDebuggerStatement()) return; | |
243 | |
244 // If there is a real break point here no more to do. | |
245 if (HasBreakPoint()) { | |
246 DCHECK(IsDebugBreak()); | |
247 return; | |
248 } | |
249 | |
250 // Patch code with debug break. | |
251 SetDebugBreak(); | |
252 } | |
253 | |
254 | |
255 void BreakLocation::ClearOneShot() { | |
256 // Debugger statement always calls debugger. No need to modify it. | |
257 if (IsDebuggerStatement()) return; | |
258 | |
259 // If there is a real break point here no more to do. | |
260 if (HasBreakPoint()) { | |
261 DCHECK(IsDebugBreak()); | |
262 return; | |
263 } | |
264 | |
265 // Patch code removing debug break. | |
266 ClearDebugBreak(); | |
267 DCHECK(!IsDebugBreak()); | |
268 } | |
269 | |
270 | |
271 void BreakLocation::SetDebugBreak() { | |
272 // Debugger statement always calls debugger. No need to modify it. | |
273 if (IsDebuggerStatement()) return; | |
274 | |
275 // If there is already a break point here just return. This might happen if | |
276 // the same code is flooded with break points twice. Flooding the same | |
277 // function twice might happen when stepping in a function with an exception | |
278 // handler as the handler and the function is the same. | |
279 if (IsDebugBreak()) return; | |
280 | |
281 DCHECK(IsDebugBreakSlot()); | |
282 Builtins* builtins = debug_info_->GetIsolate()->builtins(); | |
283 Handle<Code> target = | |
284 IsReturn() ? builtins->Return_DebugBreak() : builtins->Slot_DebugBreak(); | |
285 DebugCodegen::PatchDebugBreakSlot(pc(), target); | |
286 DCHECK(IsDebugBreak()); | |
287 } | |
288 | |
289 | |
290 void BreakLocation::ClearDebugBreak() { | |
291 // Debugger statement always calls debugger. No need to modify it. | |
292 if (IsDebuggerStatement()) return; | |
293 | |
294 DCHECK(IsDebugBreakSlot()); | |
295 DebugCodegen::ClearDebugBreakSlot(pc()); | |
296 DCHECK(!IsDebugBreak()); | |
297 } | |
298 | |
299 | |
300 bool BreakLocation::IsStepInLocation() const { | |
301 return IsConstructCall() || IsCall(); | |
302 } | |
303 | |
304 | |
305 bool BreakLocation::IsDebugBreak() const { | |
306 if (IsDebugBreakSlot()) { | |
307 return rinfo().IsPatchedDebugBreakSlotSequence(); | |
308 } | |
309 return false; | |
310 } | |
311 | |
312 | |
313 Handle<Object> BreakLocation::BreakPointObjects() const { | |
314 return debug_info_->GetBreakPointObjects(pc_offset_); | |
315 } | |
316 | |
317 | |
318 // Threading support. | |
319 void Debug::ThreadInit() { | |
320 thread_local_.break_count_ = 0; | |
321 thread_local_.break_id_ = 0; | |
322 thread_local_.break_frame_id_ = StackFrame::NO_ID; | |
323 thread_local_.last_step_action_ = StepNone; | |
324 thread_local_.last_statement_position_ = RelocInfo::kNoPosition; | |
325 thread_local_.step_count_ = 0; | |
326 thread_local_.last_fp_ = 0; | |
327 thread_local_.queued_step_count_ = 0; | |
328 thread_local_.step_into_fp_ = 0; | |
329 thread_local_.step_out_fp_ = 0; | |
330 // TODO(isolates): frames_are_dropped_? | |
331 base::NoBarrier_Store(&thread_local_.current_debug_scope_, | |
332 static_cast<base::AtomicWord>(0)); | |
333 thread_local_.restarter_frame_function_pointer_ = NULL; | |
334 } | |
335 | |
336 | |
337 char* Debug::ArchiveDebug(char* storage) { | |
338 char* to = storage; | |
339 MemCopy(to, reinterpret_cast<char*>(&thread_local_), sizeof(ThreadLocal)); | |
340 ThreadInit(); | |
341 return storage + ArchiveSpacePerThread(); | |
342 } | |
343 | |
344 | |
345 char* Debug::RestoreDebug(char* storage) { | |
346 char* from = storage; | |
347 MemCopy(reinterpret_cast<char*>(&thread_local_), from, sizeof(ThreadLocal)); | |
348 return storage + ArchiveSpacePerThread(); | |
349 } | |
350 | |
351 | |
352 int Debug::ArchiveSpacePerThread() { | |
353 return sizeof(ThreadLocal); | |
354 } | |
355 | |
356 | |
357 ScriptCache::ScriptCache(Isolate* isolate) : isolate_(isolate) { | |
358 Heap* heap = isolate_->heap(); | |
359 HandleScope scope(isolate_); | |
360 | |
361 DCHECK(isolate_->debug()->is_active()); | |
362 | |
363 // Perform a GC to get rid of all unreferenced scripts. | |
364 heap->CollectAllGarbage(Heap::kMakeHeapIterableMask, "ScriptCache"); | |
365 | |
366 // Scan heap for Script objects. | |
367 List<Handle<Script> > scripts; | |
368 { | |
369 HeapIterator iterator(heap, HeapIterator::kFilterUnreachable); | |
370 DisallowHeapAllocation no_allocation; | |
371 for (HeapObject* obj = iterator.next(); obj != NULL; | |
372 obj = iterator.next()) { | |
373 if (obj->IsScript() && Script::cast(obj)->HasValidSource()) { | |
374 scripts.Add(Handle<Script>(Script::cast(obj))); | |
375 } | |
376 } | |
377 } | |
378 | |
379 GlobalHandles* global_handles = isolate_->global_handles(); | |
380 table_ = Handle<WeakValueHashTable>::cast(global_handles->Create( | |
381 Object::cast(*WeakValueHashTable::New(isolate_, scripts.length())))); | |
382 for (int i = 0; i < scripts.length(); i++) Add(scripts[i]); | |
383 } | |
384 | |
385 | |
386 void ScriptCache::Add(Handle<Script> script) { | |
387 HandleScope scope(isolate_); | |
388 Handle<Smi> id(script->id(), isolate_); | |
389 | |
390 #ifdef DEBUG | |
391 Handle<Object> lookup(table_->LookupWeak(id), isolate_); | |
392 if (!lookup->IsTheHole()) { | |
393 Handle<Script> found = Handle<Script>::cast(lookup); | |
394 DCHECK(script->id() == found->id()); | |
395 DCHECK(!script->name()->IsString() || | |
396 String::cast(script->name())->Equals(String::cast(found->name()))); | |
397 } | |
398 #endif | |
399 | |
400 Handle<WeakValueHashTable> new_table = | |
401 WeakValueHashTable::PutWeak(table_, id, script); | |
402 | |
403 if (new_table.is_identical_to(table_)) return; | |
404 GlobalHandles* global_handles = isolate_->global_handles(); | |
405 global_handles->Destroy(Handle<Object>::cast(table_).location()); | |
406 table_ = Handle<WeakValueHashTable>::cast( | |
407 global_handles->Create(Object::cast(*new_table))); | |
408 } | |
409 | |
410 | |
411 ScriptCache::~ScriptCache() { | |
412 isolate_->global_handles()->Destroy(Handle<Object>::cast(table_).location()); | |
413 table_ = Handle<WeakValueHashTable>(); | |
414 } | |
415 | |
416 | |
417 DebugInfoListNode::DebugInfoListNode(DebugInfo* debug_info): next_(NULL) { | |
418 // Globalize the request debug info object and make it weak. | |
419 GlobalHandles* global_handles = debug_info->GetIsolate()->global_handles(); | |
420 debug_info_ = | |
421 Handle<DebugInfo>::cast(global_handles->Create(debug_info)).location(); | |
422 } | |
423 | |
424 | |
425 DebugInfoListNode::~DebugInfoListNode() { | |
426 if (debug_info_ == nullptr) return; | |
427 GlobalHandles::Destroy(reinterpret_cast<Object**>(debug_info_)); | |
428 debug_info_ = nullptr; | |
429 } | |
430 | |
431 | |
432 bool Debug::CompileDebuggerScript(Isolate* isolate, int index) { | |
433 Factory* factory = isolate->factory(); | |
434 HandleScope scope(isolate); | |
435 | |
436 // Bail out if the index is invalid. | |
437 if (index == -1) return false; | |
438 | |
439 // Find source and name for the requested script. | |
440 Handle<String> source_code = | |
441 isolate->bootstrapper()->SourceLookup<Natives>(index); | |
442 Vector<const char> name = Natives::GetScriptName(index); | |
443 Handle<String> script_name = | |
444 factory->NewStringFromAscii(name).ToHandleChecked(); | |
445 Handle<Context> context = isolate->native_context(); | |
446 | |
447 // Compile the script. | |
448 Handle<SharedFunctionInfo> function_info; | |
449 function_info = Compiler::CompileScript( | |
450 source_code, script_name, 0, 0, ScriptOriginOptions(), Handle<Object>(), | |
451 context, NULL, NULL, ScriptCompiler::kNoCompileOptions, NATIVES_CODE, | |
452 false); | |
453 if (function_info.is_null()) return false; | |
454 | |
455 // Execute the shared function in the debugger context. | |
456 Handle<JSFunction> function = | |
457 factory->NewFunctionFromSharedFunctionInfo(function_info, context); | |
458 | |
459 MaybeHandle<Object> maybe_exception; | |
460 MaybeHandle<Object> result = Execution::TryCall( | |
461 function, handle(context->global_proxy()), 0, NULL, &maybe_exception); | |
462 | |
463 // Check for caught exceptions. | |
464 if (result.is_null()) { | |
465 DCHECK(!isolate->has_pending_exception()); | |
466 MessageLocation computed_location; | |
467 isolate->ComputeLocation(&computed_location); | |
468 Handle<JSMessageObject> message = MessageHandler::MakeMessageObject( | |
469 isolate, MessageTemplate::kDebuggerLoading, &computed_location, | |
470 isolate->factory()->undefined_value(), Handle<JSArray>()); | |
471 DCHECK(!isolate->has_pending_exception()); | |
472 Handle<Object> exception; | |
473 if (maybe_exception.ToHandle(&exception)) { | |
474 isolate->set_pending_exception(*exception); | |
475 MessageHandler::ReportMessage(isolate, NULL, message); | |
476 } | |
477 DCHECK(!maybe_exception.is_null()); | |
478 return false; | |
479 } | |
480 | |
481 // Mark this script as native and return successfully. | |
482 Handle<Script> script(Script::cast(function->shared()->script())); | |
483 script->set_type(Smi::FromInt(Script::TYPE_NATIVE)); | |
484 return true; | |
485 } | |
486 | |
487 | |
488 bool Debug::Load() { | |
489 // Return if debugger is already loaded. | |
490 if (is_loaded()) return true; | |
491 | |
492 // Bail out if we're already in the process of compiling the native | |
493 // JavaScript source code for the debugger. | |
494 if (is_suppressed_) return false; | |
495 SuppressDebug while_loading(this); | |
496 | |
497 // Disable breakpoints and interrupts while compiling and running the | |
498 // debugger scripts including the context creation code. | |
499 DisableBreak disable(this, true); | |
500 PostponeInterruptsScope postpone(isolate_); | |
501 | |
502 // Create the debugger context. | |
503 HandleScope scope(isolate_); | |
504 ExtensionConfiguration no_extensions; | |
505 Handle<Context> context = isolate_->bootstrapper()->CreateEnvironment( | |
506 MaybeHandle<JSGlobalProxy>(), v8::Local<ObjectTemplate>(), | |
507 &no_extensions); | |
508 | |
509 // Fail if no context could be created. | |
510 if (context.is_null()) return false; | |
511 | |
512 // Use the debugger context. | |
513 SaveContext save(isolate_); | |
514 isolate_->set_context(*context); | |
515 | |
516 // Expose the builtins object in the debugger context. | |
517 Handle<String> key = isolate_->factory()->InternalizeOneByteString( | |
518 STATIC_CHAR_VECTOR("builtins")); | |
519 Handle<GlobalObject> global = | |
520 Handle<GlobalObject>(context->global_object(), isolate_); | |
521 Handle<JSBuiltinsObject> builtin = | |
522 Handle<JSBuiltinsObject>(global->builtins(), isolate_); | |
523 RETURN_ON_EXCEPTION_VALUE( | |
524 isolate_, Object::SetProperty(global, key, builtin, SLOPPY), false); | |
525 | |
526 // Compile the JavaScript for the debugger in the debugger context. | |
527 bool caught_exception = | |
528 !CompileDebuggerScript(isolate_, Natives::GetIndex("mirror")) || | |
529 !CompileDebuggerScript(isolate_, Natives::GetIndex("debug")); | |
530 | |
531 if (FLAG_enable_liveedit) { | |
532 caught_exception = caught_exception || | |
533 !CompileDebuggerScript(isolate_, Natives::GetIndex("liveedit")); | |
534 } | |
535 // Check for caught exceptions. | |
536 if (caught_exception) return false; | |
537 | |
538 debug_context_ = Handle<Context>::cast( | |
539 isolate_->global_handles()->Create(*context)); | |
540 return true; | |
541 } | |
542 | |
543 | |
544 void Debug::Unload() { | |
545 ClearAllBreakPoints(); | |
546 ClearStepping(); | |
547 | |
548 // Return debugger is not loaded. | |
549 if (!is_loaded()) return; | |
550 | |
551 // Clear the script cache. | |
552 if (script_cache_ != NULL) { | |
553 delete script_cache_; | |
554 script_cache_ = NULL; | |
555 } | |
556 | |
557 // Clear debugger context global handle. | |
558 GlobalHandles::Destroy(Handle<Object>::cast(debug_context_).location()); | |
559 debug_context_ = Handle<Context>(); | |
560 } | |
561 | |
562 | |
563 void Debug::Break(Arguments args, JavaScriptFrame* frame) { | |
564 Heap* heap = isolate_->heap(); | |
565 HandleScope scope(isolate_); | |
566 DCHECK(args.length() == 0); | |
567 | |
568 // Initialize LiveEdit. | |
569 LiveEdit::InitializeThreadLocal(this); | |
570 | |
571 // Just continue if breaks are disabled or debugger cannot be loaded. | |
572 if (break_disabled()) return; | |
573 | |
574 // Enter the debugger. | |
575 DebugScope debug_scope(this); | |
576 if (debug_scope.failed()) return; | |
577 | |
578 // Postpone interrupt during breakpoint processing. | |
579 PostponeInterruptsScope postpone(isolate_); | |
580 | |
581 // Get the debug info (create it if it does not exist). | |
582 Handle<SharedFunctionInfo> shared = | |
583 Handle<SharedFunctionInfo>(frame->function()->shared()); | |
584 Handle<DebugInfo> debug_info(shared->GetDebugInfo()); | |
585 | |
586 // Find the break point where execution has stopped. | |
587 // PC points to the instruction after the current one, possibly a break | |
588 // location as well. So the "- 1" to exclude it from the search. | |
589 Address call_pc = frame->pc() - 1; | |
590 BreakLocation break_location = | |
591 BreakLocation::FromAddress(debug_info, ALL_BREAK_LOCATIONS, call_pc); | |
592 | |
593 // Check whether step next reached a new statement. | |
594 if (!StepNextContinue(&break_location, frame)) { | |
595 // Decrease steps left if performing multiple steps. | |
596 if (thread_local_.step_count_ > 0) { | |
597 thread_local_.step_count_--; | |
598 } | |
599 } | |
600 | |
601 // If there is one or more real break points check whether any of these are | |
602 // triggered. | |
603 Handle<Object> break_points_hit(heap->undefined_value(), isolate_); | |
604 if (break_location.HasBreakPoint()) { | |
605 Handle<Object> break_point_objects = break_location.BreakPointObjects(); | |
606 break_points_hit = CheckBreakPoints(break_point_objects); | |
607 } | |
608 | |
609 // If step out is active skip everything until the frame where we need to step | |
610 // out to is reached, unless real breakpoint is hit. | |
611 if (StepOutActive() && | |
612 frame->fp() != thread_local_.step_out_fp_ && | |
613 break_points_hit->IsUndefined() ) { | |
614 // Step count should always be 0 for StepOut. | |
615 DCHECK(thread_local_.step_count_ == 0); | |
616 } else if (!break_points_hit->IsUndefined() || | |
617 (thread_local_.last_step_action_ != StepNone && | |
618 thread_local_.step_count_ == 0)) { | |
619 // Notify debugger if a real break point is triggered or if performing | |
620 // single stepping with no more steps to perform. Otherwise do another step. | |
621 | |
622 // Clear all current stepping setup. | |
623 ClearStepping(); | |
624 | |
625 if (thread_local_.queued_step_count_ > 0) { | |
626 // Perform queued steps | |
627 int step_count = thread_local_.queued_step_count_; | |
628 | |
629 // Clear queue | |
630 thread_local_.queued_step_count_ = 0; | |
631 | |
632 PrepareStep(StepNext, step_count, StackFrame::NO_ID); | |
633 } else { | |
634 // Notify the debug event listeners. | |
635 OnDebugBreak(break_points_hit, false); | |
636 } | |
637 } else if (thread_local_.last_step_action_ != StepNone) { | |
638 // Hold on to last step action as it is cleared by the call to | |
639 // ClearStepping. | |
640 StepAction step_action = thread_local_.last_step_action_; | |
641 int step_count = thread_local_.step_count_; | |
642 | |
643 // If StepNext goes deeper in code, StepOut until original frame | |
644 // and keep step count queued up in the meantime. | |
645 if (step_action == StepNext && frame->fp() < thread_local_.last_fp_) { | |
646 // Count frames until target frame | |
647 int count = 0; | |
648 JavaScriptFrameIterator it(isolate_); | |
649 while (!it.done() && it.frame()->fp() < thread_local_.last_fp_) { | |
650 count++; | |
651 it.Advance(); | |
652 } | |
653 | |
654 // Check that we indeed found the frame we are looking for. | |
655 CHECK(!it.done() && (it.frame()->fp() == thread_local_.last_fp_)); | |
656 if (step_count > 1) { | |
657 // Save old count and action to continue stepping after StepOut. | |
658 thread_local_.queued_step_count_ = step_count - 1; | |
659 } | |
660 | |
661 // Set up for StepOut to reach target frame. | |
662 step_action = StepOut; | |
663 step_count = count; | |
664 } | |
665 | |
666 // Clear all current stepping setup. | |
667 ClearStepping(); | |
668 | |
669 // Set up for the remaining steps. | |
670 PrepareStep(step_action, step_count, StackFrame::NO_ID); | |
671 } | |
672 } | |
673 | |
674 | |
675 // Check the break point objects for whether one or more are actually | |
676 // triggered. This function returns a JSArray with the break point objects | |
677 // which is triggered. | |
678 Handle<Object> Debug::CheckBreakPoints(Handle<Object> break_point_objects) { | |
679 Factory* factory = isolate_->factory(); | |
680 | |
681 // Count the number of break points hit. If there are multiple break points | |
682 // they are in a FixedArray. | |
683 Handle<FixedArray> break_points_hit; | |
684 int break_points_hit_count = 0; | |
685 DCHECK(!break_point_objects->IsUndefined()); | |
686 if (break_point_objects->IsFixedArray()) { | |
687 Handle<FixedArray> array(FixedArray::cast(*break_point_objects)); | |
688 break_points_hit = factory->NewFixedArray(array->length()); | |
689 for (int i = 0; i < array->length(); i++) { | |
690 Handle<Object> o(array->get(i), isolate_); | |
691 if (CheckBreakPoint(o)) { | |
692 break_points_hit->set(break_points_hit_count++, *o); | |
693 } | |
694 } | |
695 } else { | |
696 break_points_hit = factory->NewFixedArray(1); | |
697 if (CheckBreakPoint(break_point_objects)) { | |
698 break_points_hit->set(break_points_hit_count++, *break_point_objects); | |
699 } | |
700 } | |
701 | |
702 // Return undefined if no break points were triggered. | |
703 if (break_points_hit_count == 0) { | |
704 return factory->undefined_value(); | |
705 } | |
706 // Return break points hit as a JSArray. | |
707 Handle<JSArray> result = factory->NewJSArrayWithElements(break_points_hit); | |
708 result->set_length(Smi::FromInt(break_points_hit_count)); | |
709 return result; | |
710 } | |
711 | |
712 | |
713 // Check whether a single break point object is triggered. | |
714 bool Debug::CheckBreakPoint(Handle<Object> break_point_object) { | |
715 Factory* factory = isolate_->factory(); | |
716 HandleScope scope(isolate_); | |
717 | |
718 // Ignore check if break point object is not a JSObject. | |
719 if (!break_point_object->IsJSObject()) return true; | |
720 | |
721 // Get the function IsBreakPointTriggered (defined in debug-debugger.js). | |
722 Handle<String> is_break_point_triggered_string = | |
723 factory->InternalizeOneByteString( | |
724 STATIC_CHAR_VECTOR("IsBreakPointTriggered")); | |
725 Handle<GlobalObject> debug_global(debug_context()->global_object()); | |
726 Handle<JSFunction> check_break_point = | |
727 Handle<JSFunction>::cast(Object::GetProperty( | |
728 debug_global, is_break_point_triggered_string).ToHandleChecked()); | |
729 | |
730 // Get the break id as an object. | |
731 Handle<Object> break_id = factory->NewNumberFromInt(Debug::break_id()); | |
732 | |
733 // Call HandleBreakPointx. | |
734 Handle<Object> argv[] = { break_id, break_point_object }; | |
735 Handle<Object> result; | |
736 if (!Execution::TryCall(check_break_point, | |
737 isolate_->js_builtins_object(), | |
738 arraysize(argv), | |
739 argv).ToHandle(&result)) { | |
740 return false; | |
741 } | |
742 | |
743 // Return whether the break point is triggered. | |
744 return result->IsTrue(); | |
745 } | |
746 | |
747 | |
748 bool Debug::SetBreakPoint(Handle<JSFunction> function, | |
749 Handle<Object> break_point_object, | |
750 int* source_position) { | |
751 HandleScope scope(isolate_); | |
752 | |
753 // Make sure the function is compiled and has set up the debug info. | |
754 Handle<SharedFunctionInfo> shared(function->shared()); | |
755 if (!EnsureDebugInfo(shared, function)) { | |
756 // Return if retrieving debug info failed. | |
757 return true; | |
758 } | |
759 | |
760 Handle<DebugInfo> debug_info(shared->GetDebugInfo()); | |
761 // Source positions starts with zero. | |
762 DCHECK(*source_position >= 0); | |
763 | |
764 // Find the break point and change it. | |
765 BreakLocation location = BreakLocation::FromPosition( | |
766 debug_info, ALL_BREAK_LOCATIONS, *source_position, STATEMENT_ALIGNED); | |
767 *source_position = location.statement_position(); | |
768 location.SetBreakPoint(break_point_object); | |
769 | |
770 // At least one active break point now. | |
771 return debug_info->GetBreakPointCount() > 0; | |
772 } | |
773 | |
774 | |
775 bool Debug::SetBreakPointForScript(Handle<Script> script, | |
776 Handle<Object> break_point_object, | |
777 int* source_position, | |
778 BreakPositionAlignment alignment) { | |
779 HandleScope scope(isolate_); | |
780 | |
781 // Obtain shared function info for the function. | |
782 Handle<Object> result = | |
783 FindSharedFunctionInfoInScript(script, *source_position); | |
784 if (result->IsUndefined()) return false; | |
785 | |
786 // Make sure the function has set up the debug info. | |
787 Handle<SharedFunctionInfo> shared = Handle<SharedFunctionInfo>::cast(result); | |
788 if (!EnsureDebugInfo(shared, Handle<JSFunction>::null())) { | |
789 // Return if retrieving debug info failed. | |
790 return false; | |
791 } | |
792 | |
793 // Find position within function. The script position might be before the | |
794 // source position of the first function. | |
795 int position; | |
796 if (shared->start_position() > *source_position) { | |
797 position = 0; | |
798 } else { | |
799 position = *source_position - shared->start_position(); | |
800 } | |
801 | |
802 Handle<DebugInfo> debug_info(shared->GetDebugInfo()); | |
803 // Source positions starts with zero. | |
804 DCHECK(position >= 0); | |
805 | |
806 // Find the break point and change it. | |
807 BreakLocation location = BreakLocation::FromPosition( | |
808 debug_info, ALL_BREAK_LOCATIONS, position, alignment); | |
809 location.SetBreakPoint(break_point_object); | |
810 | |
811 position = (alignment == STATEMENT_ALIGNED) ? location.statement_position() | |
812 : location.position(); | |
813 | |
814 *source_position = position + shared->start_position(); | |
815 | |
816 // At least one active break point now. | |
817 DCHECK(debug_info->GetBreakPointCount() > 0); | |
818 return true; | |
819 } | |
820 | |
821 | |
822 void Debug::ClearBreakPoint(Handle<Object> break_point_object) { | |
823 HandleScope scope(isolate_); | |
824 | |
825 DebugInfoListNode* node = debug_info_list_; | |
826 while (node != NULL) { | |
827 Handle<Object> result = | |
828 DebugInfo::FindBreakPointInfo(node->debug_info(), break_point_object); | |
829 if (!result->IsUndefined()) { | |
830 // Get information in the break point. | |
831 Handle<BreakPointInfo> break_point_info = | |
832 Handle<BreakPointInfo>::cast(result); | |
833 Handle<DebugInfo> debug_info = node->debug_info(); | |
834 | |
835 // Find the break point and clear it. | |
836 Address pc = debug_info->code()->entry() + | |
837 break_point_info->code_position()->value(); | |
838 | |
839 BreakLocation location = | |
840 BreakLocation::FromAddress(debug_info, ALL_BREAK_LOCATIONS, pc); | |
841 location.ClearBreakPoint(break_point_object); | |
842 | |
843 // If there are no more break points left remove the debug info for this | |
844 // function. | |
845 if (debug_info->GetBreakPointCount() == 0) { | |
846 RemoveDebugInfoAndClearFromShared(debug_info); | |
847 } | |
848 | |
849 return; | |
850 } | |
851 node = node->next(); | |
852 } | |
853 } | |
854 | |
855 | |
856 // Clear out all the debug break code. This is ONLY supposed to be used when | |
857 // shutting down the debugger as it will leave the break point information in | |
858 // DebugInfo even though the code is patched back to the non break point state. | |
859 void Debug::ClearAllBreakPoints() { | |
860 for (DebugInfoListNode* node = debug_info_list_; node != NULL; | |
861 node = node->next()) { | |
862 for (BreakLocation::Iterator it(node->debug_info(), ALL_BREAK_LOCATIONS); | |
863 !it.Done(); it.Next()) { | |
864 it.GetBreakLocation().ClearDebugBreak(); | |
865 } | |
866 } | |
867 // Remove all debug info. | |
868 while (debug_info_list_ != NULL) { | |
869 RemoveDebugInfoAndClearFromShared(debug_info_list_->debug_info()); | |
870 } | |
871 } | |
872 | |
873 | |
874 void Debug::FloodWithOneShot(Handle<JSFunction> function, | |
875 BreakLocatorType type) { | |
876 // Make sure the function is compiled and has set up the debug info. | |
877 Handle<SharedFunctionInfo> shared(function->shared()); | |
878 if (!EnsureDebugInfo(shared, function)) { | |
879 // Return if we failed to retrieve the debug info. | |
880 return; | |
881 } | |
882 | |
883 // Flood the function with break points. | |
884 Handle<DebugInfo> debug_info(shared->GetDebugInfo()); | |
885 for (BreakLocation::Iterator it(debug_info, type); !it.Done(); it.Next()) { | |
886 it.GetBreakLocation().SetOneShot(); | |
887 } | |
888 } | |
889 | |
890 | |
891 void Debug::FloodBoundFunctionWithOneShot(Handle<JSFunction> function) { | |
892 Handle<FixedArray> new_bindings(function->function_bindings()); | |
893 Handle<Object> bindee(new_bindings->get(JSFunction::kBoundFunctionIndex), | |
894 isolate_); | |
895 | |
896 if (!bindee.is_null() && bindee->IsJSFunction()) { | |
897 Handle<JSFunction> bindee_function(JSFunction::cast(*bindee)); | |
898 FloodWithOneShotGeneric(bindee_function); | |
899 } | |
900 } | |
901 | |
902 | |
903 void Debug::FloodDefaultConstructorWithOneShot(Handle<JSFunction> function) { | |
904 DCHECK(function->shared()->is_default_constructor()); | |
905 // Instead of stepping into the function we directly step into the super class | |
906 // constructor. | |
907 Isolate* isolate = function->GetIsolate(); | |
908 PrototypeIterator iter(isolate, function); | |
909 Handle<Object> proto = PrototypeIterator::GetCurrent(iter); | |
910 if (!proto->IsJSFunction()) return; // Object.prototype | |
911 Handle<JSFunction> function_proto = Handle<JSFunction>::cast(proto); | |
912 FloodWithOneShotGeneric(function_proto); | |
913 } | |
914 | |
915 | |
916 void Debug::FloodWithOneShotGeneric(Handle<JSFunction> function, | |
917 Handle<Object> holder) { | |
918 if (function->shared()->bound()) { | |
919 FloodBoundFunctionWithOneShot(function); | |
920 } else if (function->shared()->is_default_constructor()) { | |
921 FloodDefaultConstructorWithOneShot(function); | |
922 } else { | |
923 Isolate* isolate = function->GetIsolate(); | |
924 // Don't allow step into functions in the native context. | |
925 if (function->shared()->code() == | |
926 isolate->builtins()->builtin(Builtins::kFunctionApply) || | |
927 function->shared()->code() == | |
928 isolate->builtins()->builtin(Builtins::kFunctionCall)) { | |
929 // Handle function.apply and function.call separately to flood the | |
930 // function to be called and not the code for Builtins::FunctionApply or | |
931 // Builtins::FunctionCall. The receiver of call/apply is the target | |
932 // function. | |
933 if (!holder.is_null() && holder->IsJSFunction()) { | |
934 Handle<JSFunction> js_function = Handle<JSFunction>::cast(holder); | |
935 FloodWithOneShotGeneric(js_function); | |
936 } | |
937 } else { | |
938 FloodWithOneShot(function); | |
939 } | |
940 } | |
941 } | |
942 | |
943 | |
944 void Debug::FloodHandlerWithOneShot() { | |
945 // Iterate through the JavaScript stack looking for handlers. | |
946 StackFrame::Id id = break_frame_id(); | |
947 if (id == StackFrame::NO_ID) { | |
948 // If there is no JavaScript stack don't do anything. | |
949 return; | |
950 } | |
951 for (JavaScriptFrameIterator it(isolate_, id); !it.done(); it.Advance()) { | |
952 JavaScriptFrame* frame = it.frame(); | |
953 int stack_slots = 0; // The computed stack slot count is not used. | |
954 if (frame->LookupExceptionHandlerInTable(&stack_slots, NULL) > 0) { | |
955 // Flood the function with the catch/finally block with break points. | |
956 FloodWithOneShot(Handle<JSFunction>(frame->function())); | |
957 return; | |
958 } | |
959 } | |
960 } | |
961 | |
962 | |
963 void Debug::ChangeBreakOnException(ExceptionBreakType type, bool enable) { | |
964 if (type == BreakUncaughtException) { | |
965 break_on_uncaught_exception_ = enable; | |
966 } else { | |
967 break_on_exception_ = enable; | |
968 } | |
969 } | |
970 | |
971 | |
972 bool Debug::IsBreakOnException(ExceptionBreakType type) { | |
973 if (type == BreakUncaughtException) { | |
974 return break_on_uncaught_exception_; | |
975 } else { | |
976 return break_on_exception_; | |
977 } | |
978 } | |
979 | |
980 | |
981 FrameSummary GetFirstFrameSummary(JavaScriptFrame* frame) { | |
982 List<FrameSummary> frames(FLAG_max_inlining_levels + 1); | |
983 frame->Summarize(&frames); | |
984 return frames.first(); | |
985 } | |
986 | |
987 | |
988 void Debug::PrepareStep(StepAction step_action, | |
989 int step_count, | |
990 StackFrame::Id frame_id) { | |
991 HandleScope scope(isolate_); | |
992 | |
993 DCHECK(in_debug_scope()); | |
994 | |
995 // Remember this step action and count. | |
996 thread_local_.last_step_action_ = step_action; | |
997 if (step_action == StepOut) { | |
998 // For step out target frame will be found on the stack so there is no need | |
999 // to set step counter for it. It's expected to always be 0 for StepOut. | |
1000 thread_local_.step_count_ = 0; | |
1001 } else { | |
1002 thread_local_.step_count_ = step_count; | |
1003 } | |
1004 | |
1005 // Get the frame where the execution has stopped and skip the debug frame if | |
1006 // any. The debug frame will only be present if execution was stopped due to | |
1007 // hitting a break point. In other situations (e.g. unhandled exception) the | |
1008 // debug frame is not present. | |
1009 StackFrame::Id id = break_frame_id(); | |
1010 if (id == StackFrame::NO_ID) { | |
1011 // If there is no JavaScript stack don't do anything. | |
1012 return; | |
1013 } | |
1014 if (frame_id != StackFrame::NO_ID) { | |
1015 id = frame_id; | |
1016 } | |
1017 JavaScriptFrameIterator frames_it(isolate_, id); | |
1018 JavaScriptFrame* frame = frames_it.frame(); | |
1019 | |
1020 // First of all ensure there is one-shot break points in the top handler | |
1021 // if any. | |
1022 FloodHandlerWithOneShot(); | |
1023 | |
1024 // If the function on the top frame is unresolved perform step out. This will | |
1025 // be the case when calling unknown function and having the debugger stopped | |
1026 // in an unhandled exception. | |
1027 if (!frame->function()->IsJSFunction()) { | |
1028 // Step out: Find the calling JavaScript frame and flood it with | |
1029 // breakpoints. | |
1030 frames_it.Advance(); | |
1031 // Fill the function to return to with one-shot break points. | |
1032 JSFunction* function = frames_it.frame()->function(); | |
1033 FloodWithOneShot(Handle<JSFunction>(function)); | |
1034 return; | |
1035 } | |
1036 | |
1037 // Get the debug info (create it if it does not exist). | |
1038 FrameSummary summary = GetFirstFrameSummary(frame); | |
1039 Handle<JSFunction> function(summary.function()); | |
1040 Handle<SharedFunctionInfo> shared(function->shared()); | |
1041 if (!EnsureDebugInfo(shared, function)) { | |
1042 // Return if ensuring debug info failed. | |
1043 return; | |
1044 } | |
1045 | |
1046 Handle<DebugInfo> debug_info(shared->GetDebugInfo()); | |
1047 // Refresh frame summary if the code has been recompiled for debugging. | |
1048 if (shared->code() != *summary.code()) summary = GetFirstFrameSummary(frame); | |
1049 | |
1050 // PC points to the instruction after the current one, possibly a break | |
1051 // location as well. So the "- 1" to exclude it from the search. | |
1052 Address call_pc = summary.pc() - 1; | |
1053 BreakLocation location = | |
1054 BreakLocation::FromAddress(debug_info, ALL_BREAK_LOCATIONS, call_pc); | |
1055 | |
1056 // If this is the last break code target step out is the only possibility. | |
1057 if (location.IsReturn() || step_action == StepOut) { | |
1058 if (step_action == StepOut) { | |
1059 // Skip step_count frames starting with the current one. | |
1060 while (step_count-- > 0 && !frames_it.done()) { | |
1061 frames_it.Advance(); | |
1062 } | |
1063 } else { | |
1064 DCHECK(location.IsReturn()); | |
1065 frames_it.Advance(); | |
1066 } | |
1067 // Skip native and extension functions on the stack. | |
1068 while (!frames_it.done() && | |
1069 !frames_it.frame()->function()->IsSubjectToDebugging()) { | |
1070 frames_it.Advance(); | |
1071 } | |
1072 // Step out: If there is a JavaScript caller frame, we need to | |
1073 // flood it with breakpoints. | |
1074 if (!frames_it.done()) { | |
1075 // Fill the function to return to with one-shot break points. | |
1076 JSFunction* function = frames_it.frame()->function(); | |
1077 FloodWithOneShot(Handle<JSFunction>(function)); | |
1078 // Set target frame pointer. | |
1079 ActivateStepOut(frames_it.frame()); | |
1080 } | |
1081 return; | |
1082 } | |
1083 | |
1084 if (step_action != StepNext && step_action != StepMin) { | |
1085 // If there's restarter frame on top of the stack, just get the pointer | |
1086 // to function which is going to be restarted. | |
1087 if (thread_local_.restarter_frame_function_pointer_ != NULL) { | |
1088 Handle<JSFunction> restarted_function( | |
1089 JSFunction::cast(*thread_local_.restarter_frame_function_pointer_)); | |
1090 FloodWithOneShot(restarted_function); | |
1091 } else if (location.IsCall()) { | |
1092 // Find target function on the expression stack. | |
1093 // Expression stack looks like this (top to bottom): | |
1094 // argN | |
1095 // ... | |
1096 // arg0 | |
1097 // Receiver | |
1098 // Function to call | |
1099 int num_expressions_without_args = | |
1100 frame->ComputeExpressionsCount() - location.CallArgumentsCount(); | |
1101 DCHECK(num_expressions_without_args >= 2); | |
1102 Object* fun = frame->GetExpression(num_expressions_without_args - 2); | |
1103 | |
1104 // Flood the actual target of call/apply. | |
1105 if (fun->IsJSFunction()) { | |
1106 Isolate* isolate = JSFunction::cast(fun)->GetIsolate(); | |
1107 Code* apply = isolate->builtins()->builtin(Builtins::kFunctionApply); | |
1108 Code* call = isolate->builtins()->builtin(Builtins::kFunctionCall); | |
1109 // Find target function on the expression stack for expression like | |
1110 // Function.call.call...apply(...) | |
1111 int i = 1; | |
1112 while (fun->IsJSFunction()) { | |
1113 Code* code = JSFunction::cast(fun)->shared()->code(); | |
1114 if (code != apply && code != call) break; | |
1115 DCHECK(num_expressions_without_args >= i); | |
1116 fun = frame->GetExpression(num_expressions_without_args - i); | |
1117 i--; | |
1118 } | |
1119 } | |
1120 | |
1121 if (fun->IsJSFunction()) { | |
1122 Handle<JSFunction> js_function(JSFunction::cast(fun)); | |
1123 FloodWithOneShotGeneric(js_function); | |
1124 } | |
1125 } | |
1126 | |
1127 ActivateStepIn(frame); | |
1128 } | |
1129 | |
1130 // Fill the current function with one-shot break points even for step in on | |
1131 // a call target as the function called might be a native function for | |
1132 // which step in will not stop. It also prepares for stepping in | |
1133 // getters/setters. | |
1134 // If we are stepping into another frame, only fill calls and returns. | |
1135 FloodWithOneShot(function, step_action == StepFrame ? CALLS_AND_RETURNS | |
1136 : ALL_BREAK_LOCATIONS); | |
1137 | |
1138 // Remember source position and frame to handle step next. | |
1139 thread_local_.last_statement_position_ = | |
1140 debug_info->code()->SourceStatementPosition(summary.pc()); | |
1141 thread_local_.last_fp_ = frame->UnpaddedFP(); | |
1142 } | |
1143 | |
1144 | |
1145 // Check whether the current debug break should be reported to the debugger. It | |
1146 // is used to have step next and step in only report break back to the debugger | |
1147 // if on a different frame or in a different statement. In some situations | |
1148 // there will be several break points in the same statement when the code is | |
1149 // flooded with one-shot break points. This function helps to perform several | |
1150 // steps before reporting break back to the debugger. | |
1151 bool Debug::StepNextContinue(BreakLocation* break_location, | |
1152 JavaScriptFrame* frame) { | |
1153 // StepNext and StepOut shouldn't bring us deeper in code, so last frame | |
1154 // shouldn't be a parent of current frame. | |
1155 StepAction step_action = thread_local_.last_step_action_; | |
1156 | |
1157 if (step_action == StepNext || step_action == StepOut) { | |
1158 if (frame->fp() < thread_local_.last_fp_) return true; | |
1159 } | |
1160 | |
1161 // We stepped into a new frame if the frame pointer changed. | |
1162 if (step_action == StepFrame) { | |
1163 return frame->UnpaddedFP() == thread_local_.last_fp_; | |
1164 } | |
1165 | |
1166 // If the step last action was step next or step in make sure that a new | |
1167 // statement is hit. | |
1168 if (step_action == StepNext || step_action == StepIn) { | |
1169 // Never continue if returning from function. | |
1170 if (break_location->IsReturn()) return false; | |
1171 | |
1172 // Continue if we are still on the same frame and in the same statement. | |
1173 int current_statement_position = | |
1174 break_location->code()->SourceStatementPosition(frame->pc()); | |
1175 return thread_local_.last_fp_ == frame->UnpaddedFP() && | |
1176 thread_local_.last_statement_position_ == current_statement_position; | |
1177 } | |
1178 | |
1179 // No step next action - don't continue. | |
1180 return false; | |
1181 } | |
1182 | |
1183 | |
1184 // Check whether the code object at the specified address is a debug break code | |
1185 // object. | |
1186 bool Debug::IsDebugBreak(Address addr) { | |
1187 Code* code = Code::GetCodeFromTargetAddress(addr); | |
1188 return code->is_debug_stub(); | |
1189 } | |
1190 | |
1191 | |
1192 // Simple function for returning the source positions for active break points. | |
1193 Handle<Object> Debug::GetSourceBreakLocations( | |
1194 Handle<SharedFunctionInfo> shared, | |
1195 BreakPositionAlignment position_alignment) { | |
1196 Isolate* isolate = shared->GetIsolate(); | |
1197 Heap* heap = isolate->heap(); | |
1198 if (!shared->HasDebugInfo()) { | |
1199 return Handle<Object>(heap->undefined_value(), isolate); | |
1200 } | |
1201 Handle<DebugInfo> debug_info(shared->GetDebugInfo()); | |
1202 if (debug_info->GetBreakPointCount() == 0) { | |
1203 return Handle<Object>(heap->undefined_value(), isolate); | |
1204 } | |
1205 Handle<FixedArray> locations = | |
1206 isolate->factory()->NewFixedArray(debug_info->GetBreakPointCount()); | |
1207 int count = 0; | |
1208 for (int i = 0; i < debug_info->break_points()->length(); ++i) { | |
1209 if (!debug_info->break_points()->get(i)->IsUndefined()) { | |
1210 BreakPointInfo* break_point_info = | |
1211 BreakPointInfo::cast(debug_info->break_points()->get(i)); | |
1212 int break_points = break_point_info->GetBreakPointCount(); | |
1213 if (break_points == 0) continue; | |
1214 Smi* position = NULL; | |
1215 switch (position_alignment) { | |
1216 case STATEMENT_ALIGNED: | |
1217 position = break_point_info->statement_position(); | |
1218 break; | |
1219 case BREAK_POSITION_ALIGNED: | |
1220 position = break_point_info->source_position(); | |
1221 break; | |
1222 } | |
1223 for (int j = 0; j < break_points; ++j) locations->set(count++, position); | |
1224 } | |
1225 } | |
1226 return locations; | |
1227 } | |
1228 | |
1229 | |
1230 // Handle stepping into a function. | |
1231 void Debug::HandleStepIn(Handle<Object> function_obj, bool is_constructor) { | |
1232 // Flood getter/setter if we either step in or step to another frame. | |
1233 bool step_frame = thread_local_.last_step_action_ == StepFrame; | |
1234 if (!StepInActive() && !step_frame) return; | |
1235 if (!function_obj->IsJSFunction()) return; | |
1236 Handle<JSFunction> function = Handle<JSFunction>::cast(function_obj); | |
1237 Isolate* isolate = function->GetIsolate(); | |
1238 | |
1239 StackFrameIterator it(isolate); | |
1240 it.Advance(); | |
1241 // For constructor functions skip another frame. | |
1242 if (is_constructor) { | |
1243 DCHECK(it.frame()->is_construct()); | |
1244 it.Advance(); | |
1245 } | |
1246 Address fp = it.frame()->fp(); | |
1247 | |
1248 // Flood the function with one-shot break points if it is called from where | |
1249 // step into was requested, or when stepping into a new frame. | |
1250 if (fp == thread_local_.step_into_fp_ || step_frame) { | |
1251 FloodWithOneShotGeneric(function, Handle<Object>()); | |
1252 } | |
1253 } | |
1254 | |
1255 | |
1256 void Debug::ClearStepping() { | |
1257 // Clear the various stepping setup. | |
1258 ClearOneShot(); | |
1259 ClearStepIn(); | |
1260 ClearStepOut(); | |
1261 ClearStepNext(); | |
1262 | |
1263 // Clear multiple step counter. | |
1264 thread_local_.step_count_ = 0; | |
1265 } | |
1266 | |
1267 | |
1268 // Clears all the one-shot break points that are currently set. Normally this | |
1269 // function is called each time a break point is hit as one shot break points | |
1270 // are used to support stepping. | |
1271 void Debug::ClearOneShot() { | |
1272 // The current implementation just runs through all the breakpoints. When the | |
1273 // last break point for a function is removed that function is automatically | |
1274 // removed from the list. | |
1275 for (DebugInfoListNode* node = debug_info_list_; node != NULL; | |
1276 node = node->next()) { | |
1277 for (BreakLocation::Iterator it(node->debug_info(), ALL_BREAK_LOCATIONS); | |
1278 !it.Done(); it.Next()) { | |
1279 it.GetBreakLocation().ClearOneShot(); | |
1280 } | |
1281 } | |
1282 } | |
1283 | |
1284 | |
1285 void Debug::ActivateStepIn(StackFrame* frame) { | |
1286 DCHECK(!StepOutActive()); | |
1287 thread_local_.step_into_fp_ = frame->UnpaddedFP(); | |
1288 } | |
1289 | |
1290 | |
1291 void Debug::ClearStepIn() { | |
1292 thread_local_.step_into_fp_ = 0; | |
1293 } | |
1294 | |
1295 | |
1296 void Debug::ActivateStepOut(StackFrame* frame) { | |
1297 DCHECK(!StepInActive()); | |
1298 thread_local_.step_out_fp_ = frame->UnpaddedFP(); | |
1299 } | |
1300 | |
1301 | |
1302 void Debug::ClearStepOut() { | |
1303 thread_local_.step_out_fp_ = 0; | |
1304 } | |
1305 | |
1306 | |
1307 void Debug::ClearStepNext() { | |
1308 thread_local_.last_step_action_ = StepNone; | |
1309 thread_local_.last_statement_position_ = RelocInfo::kNoPosition; | |
1310 thread_local_.last_fp_ = 0; | |
1311 } | |
1312 | |
1313 | |
1314 bool MatchingCodeTargets(Code* target1, Code* target2) { | |
1315 if (target1 == target2) return true; | |
1316 if (target1->kind() != target2->kind()) return false; | |
1317 return target1->is_handler() || target1->is_inline_cache_stub(); | |
1318 } | |
1319 | |
1320 | |
1321 // Count the number of calls before the current frame PC to find the | |
1322 // corresponding PC in the newly recompiled code. | |
1323 static Address ComputeNewPcForRedirect(Code* new_code, Code* old_code, | |
1324 Address old_pc) { | |
1325 DCHECK_EQ(old_code->kind(), Code::FUNCTION); | |
1326 DCHECK_EQ(new_code->kind(), Code::FUNCTION); | |
1327 DCHECK(new_code->has_debug_break_slots()); | |
1328 static const int mask = RelocInfo::kCodeTargetMask; | |
1329 | |
1330 // Find the target of the current call. | |
1331 Code* target = NULL; | |
1332 intptr_t delta = 0; | |
1333 for (RelocIterator it(old_code, mask); !it.done(); it.next()) { | |
1334 RelocInfo* rinfo = it.rinfo(); | |
1335 Address current_pc = rinfo->pc(); | |
1336 // The frame PC is behind the call instruction by the call instruction size. | |
1337 if (current_pc > old_pc) break; | |
1338 delta = old_pc - current_pc; | |
1339 target = Code::GetCodeFromTargetAddress(rinfo->target_address()); | |
1340 } | |
1341 | |
1342 // Count the number of calls to the same target before the current call. | |
1343 int index = 0; | |
1344 for (RelocIterator it(old_code, mask); !it.done(); it.next()) { | |
1345 RelocInfo* rinfo = it.rinfo(); | |
1346 Address current_pc = rinfo->pc(); | |
1347 if (current_pc > old_pc) break; | |
1348 Code* current = Code::GetCodeFromTargetAddress(rinfo->target_address()); | |
1349 if (MatchingCodeTargets(target, current)) index++; | |
1350 } | |
1351 | |
1352 DCHECK(index > 0); | |
1353 | |
1354 // Repeat the count on the new code to find corresponding call. | |
1355 for (RelocIterator it(new_code, mask); !it.done(); it.next()) { | |
1356 RelocInfo* rinfo = it.rinfo(); | |
1357 Code* current = Code::GetCodeFromTargetAddress(rinfo->target_address()); | |
1358 if (MatchingCodeTargets(target, current)) index--; | |
1359 if (index == 0) return rinfo->pc() + delta; | |
1360 } | |
1361 | |
1362 UNREACHABLE(); | |
1363 return NULL; | |
1364 } | |
1365 | |
1366 | |
1367 // Count the number of continuations at which the current pc offset is at. | |
1368 static int ComputeContinuationIndexFromPcOffset(Code* code, int pc_offset) { | |
1369 DCHECK_EQ(code->kind(), Code::FUNCTION); | |
1370 Address pc = code->instruction_start() + pc_offset; | |
1371 int mask = RelocInfo::ModeMask(RelocInfo::GENERATOR_CONTINUATION); | |
1372 int index = 0; | |
1373 for (RelocIterator it(code, mask); !it.done(); it.next()) { | |
1374 index++; | |
1375 RelocInfo* rinfo = it.rinfo(); | |
1376 Address current_pc = rinfo->pc(); | |
1377 if (current_pc == pc) break; | |
1378 DCHECK(current_pc < pc); | |
1379 } | |
1380 return index; | |
1381 } | |
1382 | |
1383 | |
1384 // Find the pc offset for the given continuation index. | |
1385 static int ComputePcOffsetFromContinuationIndex(Code* code, int index) { | |
1386 DCHECK_EQ(code->kind(), Code::FUNCTION); | |
1387 DCHECK(code->has_debug_break_slots()); | |
1388 int mask = RelocInfo::ModeMask(RelocInfo::GENERATOR_CONTINUATION); | |
1389 RelocIterator it(code, mask); | |
1390 for (int i = 1; i < index; i++) it.next(); | |
1391 return static_cast<int>(it.rinfo()->pc() - code->instruction_start()); | |
1392 } | |
1393 | |
1394 | |
1395 class RedirectActiveFunctions : public ThreadVisitor { | |
1396 public: | |
1397 explicit RedirectActiveFunctions(SharedFunctionInfo* shared) | |
1398 : shared_(shared) { | |
1399 DCHECK(shared->HasDebugCode()); | |
1400 } | |
1401 | |
1402 void VisitThread(Isolate* isolate, ThreadLocalTop* top) { | |
1403 for (JavaScriptFrameIterator it(isolate, top); !it.done(); it.Advance()) { | |
1404 JavaScriptFrame* frame = it.frame(); | |
1405 JSFunction* function = frame->function(); | |
1406 if (frame->is_optimized()) continue; | |
1407 if (!function->Inlines(shared_)) continue; | |
1408 | |
1409 Code* frame_code = frame->LookupCode(); | |
1410 DCHECK(frame_code->kind() == Code::FUNCTION); | |
1411 if (frame_code->has_debug_break_slots()) continue; | |
1412 | |
1413 Code* new_code = function->shared()->code(); | |
1414 Address old_pc = frame->pc(); | |
1415 Address new_pc = ComputeNewPcForRedirect(new_code, frame_code, old_pc); | |
1416 | |
1417 if (FLAG_trace_deopt) { | |
1418 PrintF("Replacing pc for debugging: %08" V8PRIxPTR " => %08" V8PRIxPTR | |
1419 "\n", | |
1420 reinterpret_cast<intptr_t>(old_pc), | |
1421 reinterpret_cast<intptr_t>(new_pc)); | |
1422 } | |
1423 | |
1424 if (FLAG_enable_embedded_constant_pool) { | |
1425 // Update constant pool pointer for new code. | |
1426 frame->set_constant_pool(new_code->constant_pool()); | |
1427 } | |
1428 | |
1429 // Patch the return address to return into the code with | |
1430 // debug break slots. | |
1431 frame->set_pc(new_pc); | |
1432 } | |
1433 } | |
1434 | |
1435 private: | |
1436 SharedFunctionInfo* shared_; | |
1437 DisallowHeapAllocation no_gc_; | |
1438 }; | |
1439 | |
1440 | |
1441 bool Debug::PrepareFunctionForBreakPoints(Handle<SharedFunctionInfo> shared) { | |
1442 DCHECK(shared->is_compiled()); | |
1443 | |
1444 if (isolate_->concurrent_recompilation_enabled()) { | |
1445 isolate_->optimizing_compile_dispatcher()->Flush(); | |
1446 } | |
1447 | |
1448 List<Handle<JSFunction> > functions; | |
1449 List<Handle<JSGeneratorObject> > suspended_generators; | |
1450 | |
1451 if (!shared->optimized_code_map()->IsSmi()) { | |
1452 shared->ClearOptimizedCodeMap(); | |
1453 } | |
1454 | |
1455 // Make sure we abort incremental marking. | |
1456 isolate_->heap()->CollectAllGarbage(Heap::kMakeHeapIterableMask, | |
1457 "prepare for break points"); | |
1458 | |
1459 { | |
1460 HeapIterator iterator(isolate_->heap()); | |
1461 HeapObject* obj; | |
1462 bool include_generators = shared->is_generator(); | |
1463 | |
1464 while ((obj = iterator.next())) { | |
1465 if (obj->IsJSFunction()) { | |
1466 JSFunction* function = JSFunction::cast(obj); | |
1467 if (!function->Inlines(*shared)) continue; | |
1468 if (function->code()->kind() == Code::OPTIMIZED_FUNCTION) { | |
1469 Deoptimizer::DeoptimizeFunction(function); | |
1470 } | |
1471 if (function->shared() == *shared) functions.Add(handle(function)); | |
1472 } else if (include_generators && obj->IsJSGeneratorObject()) { | |
1473 JSGeneratorObject* generator_obj = JSGeneratorObject::cast(obj); | |
1474 if (!generator_obj->is_suspended()) continue; | |
1475 JSFunction* function = generator_obj->function(); | |
1476 if (!function->Inlines(*shared)) continue; | |
1477 int pc_offset = generator_obj->continuation(); | |
1478 int index = | |
1479 ComputeContinuationIndexFromPcOffset(function->code(), pc_offset); | |
1480 generator_obj->set_continuation(index); | |
1481 suspended_generators.Add(handle(generator_obj)); | |
1482 } | |
1483 } | |
1484 } | |
1485 | |
1486 if (!shared->HasDebugCode()) { | |
1487 DCHECK(functions.length() > 0); | |
1488 if (!Compiler::CompileDebugCode(functions.first())) return false; | |
1489 } | |
1490 | |
1491 for (Handle<JSFunction> const function : functions) { | |
1492 function->ReplaceCode(shared->code()); | |
1493 } | |
1494 | |
1495 for (Handle<JSGeneratorObject> const generator_obj : suspended_generators) { | |
1496 int index = generator_obj->continuation(); | |
1497 int pc_offset = ComputePcOffsetFromContinuationIndex(shared->code(), index); | |
1498 generator_obj->set_continuation(pc_offset); | |
1499 } | |
1500 | |
1501 // Update PCs on the stack to point to recompiled code. | |
1502 RedirectActiveFunctions redirect_visitor(*shared); | |
1503 redirect_visitor.VisitThread(isolate_, isolate_->thread_local_top()); | |
1504 isolate_->thread_manager()->IterateArchivedThreads(&redirect_visitor); | |
1505 | |
1506 return true; | |
1507 } | |
1508 | |
1509 | |
1510 class SharedFunctionInfoFinder { | |
1511 public: | |
1512 explicit SharedFunctionInfoFinder(int target_position) | |
1513 : current_candidate_(NULL), | |
1514 current_candidate_closure_(NULL), | |
1515 current_start_position_(RelocInfo::kNoPosition), | |
1516 target_position_(target_position) {} | |
1517 | |
1518 void NewCandidate(SharedFunctionInfo* shared, JSFunction* closure = NULL) { | |
1519 int start_position = shared->function_token_position(); | |
1520 if (start_position == RelocInfo::kNoPosition) { | |
1521 start_position = shared->start_position(); | |
1522 } | |
1523 | |
1524 if (start_position > target_position_) return; | |
1525 if (target_position_ > shared->end_position()) return; | |
1526 | |
1527 if (current_candidate_ != NULL) { | |
1528 if (current_start_position_ == start_position && | |
1529 shared->end_position() == current_candidate_->end_position()) { | |
1530 // If a top-level function contains only one function | |
1531 // declaration the source for the top-level and the function | |
1532 // is the same. In that case prefer the non top-level function. | |
1533 if (shared->is_toplevel()) return; | |
1534 } else if (start_position < current_start_position_ || | |
1535 current_candidate_->end_position() < shared->end_position()) { | |
1536 return; | |
1537 } | |
1538 } | |
1539 | |
1540 current_start_position_ = start_position; | |
1541 current_candidate_ = shared; | |
1542 current_candidate_closure_ = closure; | |
1543 } | |
1544 | |
1545 SharedFunctionInfo* Result() { return current_candidate_; } | |
1546 | |
1547 JSFunction* ResultClosure() { return current_candidate_closure_; } | |
1548 | |
1549 private: | |
1550 SharedFunctionInfo* current_candidate_; | |
1551 JSFunction* current_candidate_closure_; | |
1552 int current_start_position_; | |
1553 int target_position_; | |
1554 DisallowHeapAllocation no_gc_; | |
1555 }; | |
1556 | |
1557 | |
1558 // We need to find a SFI for a literal that may not yet have been compiled yet, | |
1559 // and there may not be a JSFunction referencing it. Find the SFI closest to | |
1560 // the given position, compile it to reveal possible inner SFIs and repeat. | |
1561 // While we are at this, also ensure code with debug break slots so that we do | |
1562 // not have to compile a SFI without JSFunction, which is paifu for those that | |
1563 // cannot be compiled without context (need to find outer compilable SFI etc.) | |
1564 Handle<Object> Debug::FindSharedFunctionInfoInScript(Handle<Script> script, | |
1565 int position) { | |
1566 while (true) { | |
1567 // Go through all shared function infos associated with this script to | |
1568 // find the inner most function containing this position. | |
1569 if (!script->shared_function_infos()->IsWeakFixedArray()) break; | |
1570 WeakFixedArray* array = | |
1571 WeakFixedArray::cast(script->shared_function_infos()); | |
1572 | |
1573 SharedFunctionInfo* shared; | |
1574 { | |
1575 SharedFunctionInfoFinder finder(position); | |
1576 for (int i = 0; i < array->Length(); i++) { | |
1577 Object* item = array->Get(i); | |
1578 if (!item->IsSharedFunctionInfo()) continue; | |
1579 finder.NewCandidate(SharedFunctionInfo::cast(item)); | |
1580 } | |
1581 shared = finder.Result(); | |
1582 if (shared == NULL) break; | |
1583 // We found it if it's already compiled and has debug code. | |
1584 if (shared->HasDebugCode()) return handle(shared); | |
1585 } | |
1586 // If not, compile to reveal inner functions, if possible. | |
1587 if (shared->allows_lazy_compilation_without_context()) { | |
1588 HandleScope scope(isolate_); | |
1589 if (!Compiler::CompileDebugCode(handle(shared))) break; | |
1590 continue; | |
1591 } | |
1592 | |
1593 // If not possible, comb the heap for the best suitable compile target. | |
1594 JSFunction* closure; | |
1595 { | |
1596 HeapIterator it(isolate_->heap()); | |
1597 SharedFunctionInfoFinder finder(position); | |
1598 while (HeapObject* object = it.next()) { | |
1599 JSFunction* candidate_closure = NULL; | |
1600 SharedFunctionInfo* candidate = NULL; | |
1601 if (object->IsJSFunction()) { | |
1602 candidate_closure = JSFunction::cast(object); | |
1603 candidate = candidate_closure->shared(); | |
1604 } else if (object->IsSharedFunctionInfo()) { | |
1605 candidate = SharedFunctionInfo::cast(object); | |
1606 if (!candidate->allows_lazy_compilation_without_context()) continue; | |
1607 } else { | |
1608 continue; | |
1609 } | |
1610 if (candidate->script() == *script) { | |
1611 finder.NewCandidate(candidate, candidate_closure); | |
1612 } | |
1613 } | |
1614 closure = finder.ResultClosure(); | |
1615 shared = finder.Result(); | |
1616 } | |
1617 HandleScope scope(isolate_); | |
1618 if (closure == NULL) { | |
1619 if (!Compiler::CompileDebugCode(handle(shared))) break; | |
1620 } else { | |
1621 if (!Compiler::CompileDebugCode(handle(closure))) break; | |
1622 } | |
1623 } | |
1624 return isolate_->factory()->undefined_value(); | |
1625 } | |
1626 | |
1627 | |
1628 // Ensures the debug information is present for shared. | |
1629 bool Debug::EnsureDebugInfo(Handle<SharedFunctionInfo> shared, | |
1630 Handle<JSFunction> function) { | |
1631 if (!shared->IsSubjectToDebugging()) return false; | |
1632 | |
1633 // Return if we already have the debug info for shared. | |
1634 if (shared->HasDebugInfo()) return true; | |
1635 | |
1636 if (function.is_null()) { | |
1637 DCHECK(shared->HasDebugCode()); | |
1638 } else if (!Compiler::EnsureCompiled(function, CLEAR_EXCEPTION)) { | |
1639 return false; | |
1640 } | |
1641 | |
1642 if (!PrepareFunctionForBreakPoints(shared)) return false; | |
1643 | |
1644 // Make sure IC state is clean. This is so that we correctly flood | |
1645 // accessor pairs when stepping in. | |
1646 shared->code()->ClearInlineCaches(); | |
1647 shared->feedback_vector()->ClearICSlots(*shared); | |
1648 | |
1649 // Create the debug info object. | |
1650 DCHECK(shared->HasDebugCode()); | |
1651 Handle<DebugInfo> debug_info = isolate_->factory()->NewDebugInfo(shared); | |
1652 | |
1653 // Add debug info to the list. | |
1654 DebugInfoListNode* node = new DebugInfoListNode(*debug_info); | |
1655 node->set_next(debug_info_list_); | |
1656 debug_info_list_ = node; | |
1657 | |
1658 return true; | |
1659 } | |
1660 | |
1661 | |
1662 void Debug::RemoveDebugInfoAndClearFromShared(Handle<DebugInfo> debug_info) { | |
1663 HandleScope scope(isolate_); | |
1664 Handle<SharedFunctionInfo> shared(debug_info->shared()); | |
1665 | |
1666 DCHECK_NOT_NULL(debug_info_list_); | |
1667 // Run through the debug info objects to find this one and remove it. | |
1668 DebugInfoListNode* prev = NULL; | |
1669 DebugInfoListNode* current = debug_info_list_; | |
1670 while (current != NULL) { | |
1671 if (current->debug_info().is_identical_to(debug_info)) { | |
1672 // Unlink from list. If prev is NULL we are looking at the first element. | |
1673 if (prev == NULL) { | |
1674 debug_info_list_ = current->next(); | |
1675 } else { | |
1676 prev->set_next(current->next()); | |
1677 } | |
1678 delete current; | |
1679 shared->set_debug_info(isolate_->heap()->undefined_value()); | |
1680 return; | |
1681 } | |
1682 // Move to next in list. | |
1683 prev = current; | |
1684 current = current->next(); | |
1685 } | |
1686 | |
1687 UNREACHABLE(); | |
1688 } | |
1689 | |
1690 | |
1691 void Debug::SetAfterBreakTarget(JavaScriptFrame* frame) { | |
1692 after_break_target_ = NULL; | |
1693 | |
1694 if (LiveEdit::SetAfterBreakTarget(this)) return; // LiveEdit did the job. | |
1695 | |
1696 // Continue just after the slot. | |
1697 after_break_target_ = frame->pc(); | |
1698 } | |
1699 | |
1700 | |
1701 bool Debug::IsBreakAtReturn(JavaScriptFrame* frame) { | |
1702 HandleScope scope(isolate_); | |
1703 | |
1704 // Get the executing function in which the debug break occurred. | |
1705 Handle<JSFunction> function(JSFunction::cast(frame->function())); | |
1706 Handle<SharedFunctionInfo> shared(function->shared()); | |
1707 | |
1708 // With no debug info there are no break points, so we can't be at a return. | |
1709 if (!shared->HasDebugInfo()) return false; | |
1710 Handle<DebugInfo> debug_info(shared->GetDebugInfo()); | |
1711 Handle<Code> code(debug_info->code()); | |
1712 #ifdef DEBUG | |
1713 // Get the code which is actually executing. | |
1714 Handle<Code> frame_code(frame->LookupCode()); | |
1715 DCHECK(frame_code.is_identical_to(code)); | |
1716 #endif | |
1717 | |
1718 // Find the reloc info matching the start of the debug break slot. | |
1719 Address slot_pc = frame->pc() - Assembler::kDebugBreakSlotLength; | |
1720 int mask = RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT_AT_RETURN); | |
1721 for (RelocIterator it(*code, mask); !it.done(); it.next()) { | |
1722 if (it.rinfo()->pc() == slot_pc) return true; | |
1723 } | |
1724 return false; | |
1725 } | |
1726 | |
1727 | |
1728 void Debug::FramesHaveBeenDropped(StackFrame::Id new_break_frame_id, | |
1729 LiveEdit::FrameDropMode mode, | |
1730 Object** restarter_frame_function_pointer) { | |
1731 if (mode != LiveEdit::CURRENTLY_SET_MODE) { | |
1732 thread_local_.frame_drop_mode_ = mode; | |
1733 } | |
1734 thread_local_.break_frame_id_ = new_break_frame_id; | |
1735 thread_local_.restarter_frame_function_pointer_ = | |
1736 restarter_frame_function_pointer; | |
1737 } | |
1738 | |
1739 | |
1740 bool Debug::IsDebugGlobal(GlobalObject* global) { | |
1741 return is_loaded() && global == debug_context()->global_object(); | |
1742 } | |
1743 | |
1744 | |
1745 void Debug::ClearMirrorCache() { | |
1746 PostponeInterruptsScope postpone(isolate_); | |
1747 HandleScope scope(isolate_); | |
1748 AssertDebugContext(); | |
1749 Factory* factory = isolate_->factory(); | |
1750 Handle<GlobalObject> global(isolate_->global_object()); | |
1751 JSObject::SetProperty(global, | |
1752 factory->NewStringFromAsciiChecked("next_handle_"), | |
1753 handle(Smi::FromInt(0), isolate_), SLOPPY).Check(); | |
1754 JSObject::SetProperty(global, | |
1755 factory->NewStringFromAsciiChecked("mirror_cache_"), | |
1756 factory->NewJSArray(0, FAST_ELEMENTS), SLOPPY).Check(); | |
1757 } | |
1758 | |
1759 | |
1760 Handle<FixedArray> Debug::GetLoadedScripts() { | |
1761 // Create and fill the script cache when the loaded scripts is requested for | |
1762 // the first time. | |
1763 if (script_cache_ == NULL) script_cache_ = new ScriptCache(isolate_); | |
1764 | |
1765 // Perform GC to get unreferenced scripts evicted from the cache before | |
1766 // returning the content. | |
1767 isolate_->heap()->CollectAllGarbage(Heap::kNoGCFlags, | |
1768 "Debug::GetLoadedScripts"); | |
1769 | |
1770 // Get the scripts from the cache. | |
1771 return script_cache_->GetScripts(); | |
1772 } | |
1773 | |
1774 | |
1775 void Debug::GetStepinPositions(JavaScriptFrame* frame, StackFrame::Id frame_id, | |
1776 List<int>* results_out) { | |
1777 FrameSummary summary = GetFirstFrameSummary(frame); | |
1778 | |
1779 Handle<JSFunction> fun = Handle<JSFunction>(summary.function()); | |
1780 Handle<SharedFunctionInfo> shared = Handle<SharedFunctionInfo>(fun->shared()); | |
1781 | |
1782 if (!EnsureDebugInfo(shared, fun)) return; | |
1783 | |
1784 Handle<DebugInfo> debug_info(shared->GetDebugInfo()); | |
1785 // Refresh frame summary if the code has been recompiled for debugging. | |
1786 if (shared->code() != *summary.code()) summary = GetFirstFrameSummary(frame); | |
1787 | |
1788 // Find range of break points starting from the break point where execution | |
1789 // has stopped. | |
1790 Address call_pc = summary.pc() - 1; | |
1791 List<BreakLocation> locations; | |
1792 BreakLocation::FromAddressSameStatement(debug_info, ALL_BREAK_LOCATIONS, | |
1793 call_pc, &locations); | |
1794 | |
1795 for (BreakLocation location : locations) { | |
1796 if (location.pc() <= summary.pc()) { | |
1797 // The break point is near our pc. Could be a step-in possibility, | |
1798 // that is currently taken by active debugger call. | |
1799 if (break_frame_id() == StackFrame::NO_ID) { | |
1800 continue; // We are not stepping. | |
1801 } else { | |
1802 JavaScriptFrameIterator frame_it(isolate_, break_frame_id()); | |
1803 // If our frame is a top frame and we are stepping, we can do step-in | |
1804 // at this place. | |
1805 if (frame_it.frame()->id() != frame_id) continue; | |
1806 } | |
1807 } | |
1808 if (location.IsStepInLocation()) results_out->Add(location.position()); | |
1809 } | |
1810 } | |
1811 | |
1812 | |
1813 void Debug::RecordEvalCaller(Handle<Script> script) { | |
1814 script->set_compilation_type(Script::COMPILATION_TYPE_EVAL); | |
1815 // For eval scripts add information on the function from which eval was | |
1816 // called. | |
1817 StackTraceFrameIterator it(script->GetIsolate()); | |
1818 if (!it.done()) { | |
1819 script->set_eval_from_shared(it.frame()->function()->shared()); | |
1820 Code* code = it.frame()->LookupCode(); | |
1821 int offset = static_cast<int>( | |
1822 it.frame()->pc() - code->instruction_start()); | |
1823 script->set_eval_from_instructions_offset(Smi::FromInt(offset)); | |
1824 } | |
1825 } | |
1826 | |
1827 | |
1828 MaybeHandle<Object> Debug::MakeJSObject(const char* constructor_name, | |
1829 int argc, | |
1830 Handle<Object> argv[]) { | |
1831 AssertDebugContext(); | |
1832 // Create the execution state object. | |
1833 Handle<GlobalObject> global(isolate_->global_object()); | |
1834 Handle<Object> constructor = Object::GetProperty( | |
1835 isolate_, global, constructor_name).ToHandleChecked(); | |
1836 DCHECK(constructor->IsJSFunction()); | |
1837 if (!constructor->IsJSFunction()) return MaybeHandle<Object>(); | |
1838 // We do not handle interrupts here. In particular, termination interrupts. | |
1839 PostponeInterruptsScope no_interrupts(isolate_); | |
1840 return Execution::TryCall(Handle<JSFunction>::cast(constructor), | |
1841 handle(debug_context()->global_proxy()), | |
1842 argc, | |
1843 argv); | |
1844 } | |
1845 | |
1846 | |
1847 MaybeHandle<Object> Debug::MakeExecutionState() { | |
1848 // Create the execution state object. | |
1849 Handle<Object> argv[] = { isolate_->factory()->NewNumberFromInt(break_id()) }; | |
1850 return MakeJSObject("MakeExecutionState", arraysize(argv), argv); | |
1851 } | |
1852 | |
1853 | |
1854 MaybeHandle<Object> Debug::MakeBreakEvent(Handle<Object> break_points_hit) { | |
1855 // Create the new break event object. | |
1856 Handle<Object> argv[] = { isolate_->factory()->NewNumberFromInt(break_id()), | |
1857 break_points_hit }; | |
1858 return MakeJSObject("MakeBreakEvent", arraysize(argv), argv); | |
1859 } | |
1860 | |
1861 | |
1862 MaybeHandle<Object> Debug::MakeExceptionEvent(Handle<Object> exception, | |
1863 bool uncaught, | |
1864 Handle<Object> promise) { | |
1865 // Create the new exception event object. | |
1866 Handle<Object> argv[] = { isolate_->factory()->NewNumberFromInt(break_id()), | |
1867 exception, | |
1868 isolate_->factory()->ToBoolean(uncaught), | |
1869 promise }; | |
1870 return MakeJSObject("MakeExceptionEvent", arraysize(argv), argv); | |
1871 } | |
1872 | |
1873 | |
1874 MaybeHandle<Object> Debug::MakeCompileEvent(Handle<Script> script, | |
1875 v8::DebugEvent type) { | |
1876 // Create the compile event object. | |
1877 Handle<Object> script_wrapper = Script::GetWrapper(script); | |
1878 Handle<Object> argv[] = { script_wrapper, | |
1879 isolate_->factory()->NewNumberFromInt(type) }; | |
1880 return MakeJSObject("MakeCompileEvent", arraysize(argv), argv); | |
1881 } | |
1882 | |
1883 | |
1884 MaybeHandle<Object> Debug::MakePromiseEvent(Handle<JSObject> event_data) { | |
1885 // Create the promise event object. | |
1886 Handle<Object> argv[] = { event_data }; | |
1887 return MakeJSObject("MakePromiseEvent", arraysize(argv), argv); | |
1888 } | |
1889 | |
1890 | |
1891 MaybeHandle<Object> Debug::MakeAsyncTaskEvent(Handle<JSObject> task_event) { | |
1892 // Create the async task event object. | |
1893 Handle<Object> argv[] = { task_event }; | |
1894 return MakeJSObject("MakeAsyncTaskEvent", arraysize(argv), argv); | |
1895 } | |
1896 | |
1897 | |
1898 void Debug::OnThrow(Handle<Object> exception) { | |
1899 if (in_debug_scope() || ignore_events()) return; | |
1900 // Temporarily clear any scheduled_exception to allow evaluating | |
1901 // JavaScript from the debug event handler. | |
1902 HandleScope scope(isolate_); | |
1903 Handle<Object> scheduled_exception; | |
1904 if (isolate_->has_scheduled_exception()) { | |
1905 scheduled_exception = handle(isolate_->scheduled_exception(), isolate_); | |
1906 isolate_->clear_scheduled_exception(); | |
1907 } | |
1908 OnException(exception, isolate_->GetPromiseOnStackOnThrow()); | |
1909 if (!scheduled_exception.is_null()) { | |
1910 isolate_->thread_local_top()->scheduled_exception_ = *scheduled_exception; | |
1911 } | |
1912 } | |
1913 | |
1914 | |
1915 void Debug::OnPromiseReject(Handle<JSObject> promise, Handle<Object> value) { | |
1916 if (in_debug_scope() || ignore_events()) return; | |
1917 HandleScope scope(isolate_); | |
1918 // Check whether the promise has been marked as having triggered a message. | |
1919 Handle<Symbol> key = isolate_->factory()->promise_debug_marker_symbol(); | |
1920 if (JSReceiver::GetDataProperty(promise, key)->IsUndefined()) { | |
1921 OnException(value, promise); | |
1922 } | |
1923 } | |
1924 | |
1925 | |
1926 MaybeHandle<Object> Debug::PromiseHasUserDefinedRejectHandler( | |
1927 Handle<JSObject> promise) { | |
1928 Handle<JSFunction> fun = Handle<JSFunction>::cast( | |
1929 JSReceiver::GetDataProperty(isolate_->js_builtins_object(), | |
1930 isolate_->factory()->NewStringFromStaticChars( | |
1931 "$promiseHasUserDefinedRejectHandler"))); | |
1932 return Execution::Call(isolate_, fun, promise, 0, NULL); | |
1933 } | |
1934 | |
1935 | |
1936 void Debug::OnException(Handle<Object> exception, Handle<Object> promise) { | |
1937 // In our prediction, try-finally is not considered to catch. | |
1938 Isolate::CatchType catch_type = isolate_->PredictExceptionCatcher(); | |
1939 bool uncaught = (catch_type == Isolate::NOT_CAUGHT); | |
1940 if (promise->IsJSObject()) { | |
1941 Handle<JSObject> jspromise = Handle<JSObject>::cast(promise); | |
1942 // Mark the promise as already having triggered a message. | |
1943 Handle<Symbol> key = isolate_->factory()->promise_debug_marker_symbol(); | |
1944 JSObject::SetProperty(jspromise, key, key, STRICT).Assert(); | |
1945 // Check whether the promise reject is considered an uncaught exception. | |
1946 Handle<Object> has_reject_handler; | |
1947 ASSIGN_RETURN_ON_EXCEPTION_VALUE( | |
1948 isolate_, has_reject_handler, | |
1949 PromiseHasUserDefinedRejectHandler(jspromise), /* void */); | |
1950 uncaught = has_reject_handler->IsFalse(); | |
1951 } | |
1952 // Bail out if exception breaks are not active | |
1953 if (uncaught) { | |
1954 // Uncaught exceptions are reported by either flags. | |
1955 if (!(break_on_uncaught_exception_ || break_on_exception_)) return; | |
1956 } else { | |
1957 // Caught exceptions are reported is activated. | |
1958 if (!break_on_exception_) return; | |
1959 } | |
1960 | |
1961 DebugScope debug_scope(this); | |
1962 if (debug_scope.failed()) return; | |
1963 | |
1964 // Clear all current stepping setup. | |
1965 ClearStepping(); | |
1966 | |
1967 // Create the event data object. | |
1968 Handle<Object> event_data; | |
1969 // Bail out and don't call debugger if exception. | |
1970 if (!MakeExceptionEvent( | |
1971 exception, uncaught, promise).ToHandle(&event_data)) { | |
1972 return; | |
1973 } | |
1974 | |
1975 // Process debug event. | |
1976 ProcessDebugEvent(v8::Exception, Handle<JSObject>::cast(event_data), false); | |
1977 // Return to continue execution from where the exception was thrown. | |
1978 } | |
1979 | |
1980 | |
1981 void Debug::OnCompileError(Handle<Script> script) { | |
1982 if (ignore_events()) return; | |
1983 | |
1984 if (in_debug_scope()) { | |
1985 ProcessCompileEventInDebugScope(v8::CompileError, script); | |
1986 return; | |
1987 } | |
1988 | |
1989 HandleScope scope(isolate_); | |
1990 DebugScope debug_scope(this); | |
1991 if (debug_scope.failed()) return; | |
1992 | |
1993 // Create the compile state object. | |
1994 Handle<Object> event_data; | |
1995 // Bail out and don't call debugger if exception. | |
1996 if (!MakeCompileEvent(script, v8::CompileError).ToHandle(&event_data)) return; | |
1997 | |
1998 // Process debug event. | |
1999 ProcessDebugEvent(v8::CompileError, Handle<JSObject>::cast(event_data), true); | |
2000 } | |
2001 | |
2002 | |
2003 void Debug::OnDebugBreak(Handle<Object> break_points_hit, | |
2004 bool auto_continue) { | |
2005 // The caller provided for DebugScope. | |
2006 AssertDebugContext(); | |
2007 // Bail out if there is no listener for this event | |
2008 if (ignore_events()) return; | |
2009 | |
2010 HandleScope scope(isolate_); | |
2011 // Create the event data object. | |
2012 Handle<Object> event_data; | |
2013 // Bail out and don't call debugger if exception. | |
2014 if (!MakeBreakEvent(break_points_hit).ToHandle(&event_data)) return; | |
2015 | |
2016 // Process debug event. | |
2017 ProcessDebugEvent(v8::Break, | |
2018 Handle<JSObject>::cast(event_data), | |
2019 auto_continue); | |
2020 } | |
2021 | |
2022 | |
2023 void Debug::OnBeforeCompile(Handle<Script> script) { | |
2024 if (in_debug_scope() || ignore_events()) return; | |
2025 | |
2026 HandleScope scope(isolate_); | |
2027 DebugScope debug_scope(this); | |
2028 if (debug_scope.failed()) return; | |
2029 | |
2030 // Create the event data object. | |
2031 Handle<Object> event_data; | |
2032 // Bail out and don't call debugger if exception. | |
2033 if (!MakeCompileEvent(script, v8::BeforeCompile).ToHandle(&event_data)) | |
2034 return; | |
2035 | |
2036 // Process debug event. | |
2037 ProcessDebugEvent(v8::BeforeCompile, | |
2038 Handle<JSObject>::cast(event_data), | |
2039 true); | |
2040 } | |
2041 | |
2042 | |
2043 // Handle debugger actions when a new script is compiled. | |
2044 void Debug::OnAfterCompile(Handle<Script> script) { | |
2045 // Add the newly compiled script to the script cache. | |
2046 if (script_cache_ != NULL) script_cache_->Add(script); | |
2047 | |
2048 if (ignore_events()) return; | |
2049 | |
2050 if (in_debug_scope()) { | |
2051 ProcessCompileEventInDebugScope(v8::AfterCompile, script); | |
2052 return; | |
2053 } | |
2054 | |
2055 HandleScope scope(isolate_); | |
2056 DebugScope debug_scope(this); | |
2057 if (debug_scope.failed()) return; | |
2058 | |
2059 // If debugging there might be script break points registered for this | |
2060 // script. Make sure that these break points are set. | |
2061 | |
2062 // Get the function UpdateScriptBreakPoints (defined in debug-debugger.js). | |
2063 Handle<String> update_script_break_points_string = | |
2064 isolate_->factory()->InternalizeOneByteString( | |
2065 STATIC_CHAR_VECTOR("UpdateScriptBreakPoints")); | |
2066 Handle<GlobalObject> debug_global(debug_context()->global_object()); | |
2067 Handle<Object> update_script_break_points = | |
2068 Object::GetProperty( | |
2069 debug_global, update_script_break_points_string).ToHandleChecked(); | |
2070 if (!update_script_break_points->IsJSFunction()) { | |
2071 return; | |
2072 } | |
2073 DCHECK(update_script_break_points->IsJSFunction()); | |
2074 | |
2075 // Wrap the script object in a proper JS object before passing it | |
2076 // to JavaScript. | |
2077 Handle<Object> wrapper = Script::GetWrapper(script); | |
2078 | |
2079 // Call UpdateScriptBreakPoints expect no exceptions. | |
2080 Handle<Object> argv[] = { wrapper }; | |
2081 if (Execution::TryCall(Handle<JSFunction>::cast(update_script_break_points), | |
2082 isolate_->js_builtins_object(), | |
2083 arraysize(argv), | |
2084 argv).is_null()) { | |
2085 return; | |
2086 } | |
2087 | |
2088 // Create the compile state object. | |
2089 Handle<Object> event_data; | |
2090 // Bail out and don't call debugger if exception. | |
2091 if (!MakeCompileEvent(script, v8::AfterCompile).ToHandle(&event_data)) return; | |
2092 | |
2093 // Process debug event. | |
2094 ProcessDebugEvent(v8::AfterCompile, Handle<JSObject>::cast(event_data), true); | |
2095 } | |
2096 | |
2097 | |
2098 void Debug::OnPromiseEvent(Handle<JSObject> data) { | |
2099 if (in_debug_scope() || ignore_events()) return; | |
2100 | |
2101 HandleScope scope(isolate_); | |
2102 DebugScope debug_scope(this); | |
2103 if (debug_scope.failed()) return; | |
2104 | |
2105 // Create the script collected state object. | |
2106 Handle<Object> event_data; | |
2107 // Bail out and don't call debugger if exception. | |
2108 if (!MakePromiseEvent(data).ToHandle(&event_data)) return; | |
2109 | |
2110 // Process debug event. | |
2111 ProcessDebugEvent(v8::PromiseEvent, | |
2112 Handle<JSObject>::cast(event_data), | |
2113 true); | |
2114 } | |
2115 | |
2116 | |
2117 void Debug::OnAsyncTaskEvent(Handle<JSObject> data) { | |
2118 if (in_debug_scope() || ignore_events()) return; | |
2119 | |
2120 HandleScope scope(isolate_); | |
2121 DebugScope debug_scope(this); | |
2122 if (debug_scope.failed()) return; | |
2123 | |
2124 // Create the script collected state object. | |
2125 Handle<Object> event_data; | |
2126 // Bail out and don't call debugger if exception. | |
2127 if (!MakeAsyncTaskEvent(data).ToHandle(&event_data)) return; | |
2128 | |
2129 // Process debug event. | |
2130 ProcessDebugEvent(v8::AsyncTaskEvent, | |
2131 Handle<JSObject>::cast(event_data), | |
2132 true); | |
2133 } | |
2134 | |
2135 | |
2136 void Debug::ProcessDebugEvent(v8::DebugEvent event, | |
2137 Handle<JSObject> event_data, | |
2138 bool auto_continue) { | |
2139 HandleScope scope(isolate_); | |
2140 | |
2141 // Create the execution state. | |
2142 Handle<Object> exec_state; | |
2143 // Bail out and don't call debugger if exception. | |
2144 if (!MakeExecutionState().ToHandle(&exec_state)) return; | |
2145 | |
2146 // First notify the message handler if any. | |
2147 if (message_handler_ != NULL) { | |
2148 NotifyMessageHandler(event, | |
2149 Handle<JSObject>::cast(exec_state), | |
2150 event_data, | |
2151 auto_continue); | |
2152 } | |
2153 // Notify registered debug event listener. This can be either a C or | |
2154 // a JavaScript function. Don't call event listener for v8::Break | |
2155 // here, if it's only a debug command -- they will be processed later. | |
2156 if ((event != v8::Break || !auto_continue) && !event_listener_.is_null()) { | |
2157 CallEventCallback(event, exec_state, event_data, NULL); | |
2158 } | |
2159 } | |
2160 | |
2161 | |
2162 void Debug::CallEventCallback(v8::DebugEvent event, | |
2163 Handle<Object> exec_state, | |
2164 Handle<Object> event_data, | |
2165 v8::Debug::ClientData* client_data) { | |
2166 bool previous = in_debug_event_listener_; | |
2167 in_debug_event_listener_ = true; | |
2168 if (event_listener_->IsForeign()) { | |
2169 // Invoke the C debug event listener. | |
2170 v8::Debug::EventCallback callback = | |
2171 FUNCTION_CAST<v8::Debug::EventCallback>( | |
2172 Handle<Foreign>::cast(event_listener_)->foreign_address()); | |
2173 EventDetailsImpl event_details(event, | |
2174 Handle<JSObject>::cast(exec_state), | |
2175 Handle<JSObject>::cast(event_data), | |
2176 event_listener_data_, | |
2177 client_data); | |
2178 callback(event_details); | |
2179 DCHECK(!isolate_->has_scheduled_exception()); | |
2180 } else { | |
2181 // Invoke the JavaScript debug event listener. | |
2182 DCHECK(event_listener_->IsJSFunction()); | |
2183 Handle<Object> argv[] = { Handle<Object>(Smi::FromInt(event), isolate_), | |
2184 exec_state, | |
2185 event_data, | |
2186 event_listener_data_ }; | |
2187 Handle<JSReceiver> global(isolate_->global_proxy()); | |
2188 Execution::TryCall(Handle<JSFunction>::cast(event_listener_), | |
2189 global, arraysize(argv), argv); | |
2190 } | |
2191 in_debug_event_listener_ = previous; | |
2192 } | |
2193 | |
2194 | |
2195 void Debug::ProcessCompileEventInDebugScope(v8::DebugEvent event, | |
2196 Handle<Script> script) { | |
2197 if (event_listener_.is_null()) return; | |
2198 | |
2199 SuppressDebug while_processing(this); | |
2200 DebugScope debug_scope(this); | |
2201 if (debug_scope.failed()) return; | |
2202 | |
2203 Handle<Object> event_data; | |
2204 // Bail out and don't call debugger if exception. | |
2205 if (!MakeCompileEvent(script, event).ToHandle(&event_data)) return; | |
2206 | |
2207 // Create the execution state. | |
2208 Handle<Object> exec_state; | |
2209 // Bail out and don't call debugger if exception. | |
2210 if (!MakeExecutionState().ToHandle(&exec_state)) return; | |
2211 | |
2212 CallEventCallback(event, exec_state, event_data, NULL); | |
2213 } | |
2214 | |
2215 | |
2216 Handle<Context> Debug::GetDebugContext() { | |
2217 if (!is_loaded()) return Handle<Context>(); | |
2218 DebugScope debug_scope(this); | |
2219 if (debug_scope.failed()) return Handle<Context>(); | |
2220 // The global handle may be destroyed soon after. Return it reboxed. | |
2221 return handle(*debug_context(), isolate_); | |
2222 } | |
2223 | |
2224 | |
2225 void Debug::NotifyMessageHandler(v8::DebugEvent event, | |
2226 Handle<JSObject> exec_state, | |
2227 Handle<JSObject> event_data, | |
2228 bool auto_continue) { | |
2229 // Prevent other interrupts from triggering, for example API callbacks, | |
2230 // while dispatching message handler callbacks. | |
2231 PostponeInterruptsScope no_interrupts(isolate_); | |
2232 DCHECK(is_active_); | |
2233 HandleScope scope(isolate_); | |
2234 // Process the individual events. | |
2235 bool sendEventMessage = false; | |
2236 switch (event) { | |
2237 case v8::Break: | |
2238 sendEventMessage = !auto_continue; | |
2239 break; | |
2240 case v8::NewFunction: | |
2241 case v8::BeforeCompile: | |
2242 case v8::CompileError: | |
2243 case v8::PromiseEvent: | |
2244 case v8::AsyncTaskEvent: | |
2245 break; | |
2246 case v8::Exception: | |
2247 case v8::AfterCompile: | |
2248 sendEventMessage = true; | |
2249 break; | |
2250 } | |
2251 | |
2252 // The debug command interrupt flag might have been set when the command was | |
2253 // added. It should be enough to clear the flag only once while we are in the | |
2254 // debugger. | |
2255 DCHECK(in_debug_scope()); | |
2256 isolate_->stack_guard()->ClearDebugCommand(); | |
2257 | |
2258 // Notify the debugger that a debug event has occurred unless auto continue is | |
2259 // active in which case no event is send. | |
2260 if (sendEventMessage) { | |
2261 MessageImpl message = MessageImpl::NewEvent( | |
2262 event, | |
2263 auto_continue, | |
2264 Handle<JSObject>::cast(exec_state), | |
2265 Handle<JSObject>::cast(event_data)); | |
2266 InvokeMessageHandler(message); | |
2267 } | |
2268 | |
2269 // If auto continue don't make the event cause a break, but process messages | |
2270 // in the queue if any. For script collected events don't even process | |
2271 // messages in the queue as the execution state might not be what is expected | |
2272 // by the client. | |
2273 if (auto_continue && !has_commands()) return; | |
2274 | |
2275 // DebugCommandProcessor goes here. | |
2276 bool running = auto_continue; | |
2277 | |
2278 Handle<Object> cmd_processor_ctor = Object::GetProperty( | |
2279 isolate_, exec_state, "debugCommandProcessor").ToHandleChecked(); | |
2280 Handle<Object> ctor_args[] = { isolate_->factory()->ToBoolean(running) }; | |
2281 Handle<Object> cmd_processor = Execution::Call( | |
2282 isolate_, cmd_processor_ctor, exec_state, 1, ctor_args).ToHandleChecked(); | |
2283 Handle<JSFunction> process_debug_request = Handle<JSFunction>::cast( | |
2284 Object::GetProperty( | |
2285 isolate_, cmd_processor, "processDebugRequest").ToHandleChecked()); | |
2286 Handle<Object> is_running = Object::GetProperty( | |
2287 isolate_, cmd_processor, "isRunning").ToHandleChecked(); | |
2288 | |
2289 // Process requests from the debugger. | |
2290 do { | |
2291 // Wait for new command in the queue. | |
2292 command_received_.Wait(); | |
2293 | |
2294 // Get the command from the queue. | |
2295 CommandMessage command = command_queue_.Get(); | |
2296 isolate_->logger()->DebugTag( | |
2297 "Got request from command queue, in interactive loop."); | |
2298 if (!is_active()) { | |
2299 // Delete command text and user data. | |
2300 command.Dispose(); | |
2301 return; | |
2302 } | |
2303 | |
2304 Vector<const uc16> command_text( | |
2305 const_cast<const uc16*>(command.text().start()), | |
2306 command.text().length()); | |
2307 Handle<String> request_text = isolate_->factory()->NewStringFromTwoByte( | |
2308 command_text).ToHandleChecked(); | |
2309 Handle<Object> request_args[] = { request_text }; | |
2310 Handle<Object> answer_value; | |
2311 Handle<String> answer; | |
2312 MaybeHandle<Object> maybe_exception; | |
2313 MaybeHandle<Object> maybe_result = | |
2314 Execution::TryCall(process_debug_request, cmd_processor, 1, | |
2315 request_args, &maybe_exception); | |
2316 | |
2317 if (maybe_result.ToHandle(&answer_value)) { | |
2318 if (answer_value->IsUndefined()) { | |
2319 answer = isolate_->factory()->empty_string(); | |
2320 } else { | |
2321 answer = Handle<String>::cast(answer_value); | |
2322 } | |
2323 | |
2324 // Log the JSON request/response. | |
2325 if (FLAG_trace_debug_json) { | |
2326 PrintF("%s\n", request_text->ToCString().get()); | |
2327 PrintF("%s\n", answer->ToCString().get()); | |
2328 } | |
2329 | |
2330 Handle<Object> is_running_args[] = { answer }; | |
2331 maybe_result = Execution::Call( | |
2332 isolate_, is_running, cmd_processor, 1, is_running_args); | |
2333 Handle<Object> result; | |
2334 if (!maybe_result.ToHandle(&result)) break; | |
2335 running = result->IsTrue(); | |
2336 } else { | |
2337 Handle<Object> exception; | |
2338 if (!maybe_exception.ToHandle(&exception)) break; | |
2339 Handle<Object> result; | |
2340 if (!Execution::ToString(isolate_, exception).ToHandle(&result)) break; | |
2341 answer = Handle<String>::cast(result); | |
2342 } | |
2343 | |
2344 // Return the result. | |
2345 MessageImpl message = MessageImpl::NewResponse( | |
2346 event, running, exec_state, event_data, answer, command.client_data()); | |
2347 InvokeMessageHandler(message); | |
2348 command.Dispose(); | |
2349 | |
2350 // Return from debug event processing if either the VM is put into the | |
2351 // running state (through a continue command) or auto continue is active | |
2352 // and there are no more commands queued. | |
2353 } while (!running || has_commands()); | |
2354 command_queue_.Clear(); | |
2355 } | |
2356 | |
2357 | |
2358 void Debug::SetEventListener(Handle<Object> callback, | |
2359 Handle<Object> data) { | |
2360 GlobalHandles* global_handles = isolate_->global_handles(); | |
2361 | |
2362 // Remove existing entry. | |
2363 GlobalHandles::Destroy(event_listener_.location()); | |
2364 event_listener_ = Handle<Object>(); | |
2365 GlobalHandles::Destroy(event_listener_data_.location()); | |
2366 event_listener_data_ = Handle<Object>(); | |
2367 | |
2368 // Set new entry. | |
2369 if (!callback->IsUndefined() && !callback->IsNull()) { | |
2370 event_listener_ = global_handles->Create(*callback); | |
2371 if (data.is_null()) data = isolate_->factory()->undefined_value(); | |
2372 event_listener_data_ = global_handles->Create(*data); | |
2373 } | |
2374 | |
2375 UpdateState(); | |
2376 } | |
2377 | |
2378 | |
2379 void Debug::SetMessageHandler(v8::Debug::MessageHandler handler) { | |
2380 message_handler_ = handler; | |
2381 UpdateState(); | |
2382 if (handler == NULL && in_debug_scope()) { | |
2383 // Send an empty command to the debugger if in a break to make JavaScript | |
2384 // run again if the debugger is closed. | |
2385 EnqueueCommandMessage(Vector<const uint16_t>::empty()); | |
2386 } | |
2387 } | |
2388 | |
2389 | |
2390 | |
2391 void Debug::UpdateState() { | |
2392 bool is_active = message_handler_ != NULL || !event_listener_.is_null(); | |
2393 if (is_active || in_debug_scope()) { | |
2394 // Note that the debug context could have already been loaded to | |
2395 // bootstrap test cases. | |
2396 isolate_->compilation_cache()->Disable(); | |
2397 is_active = Load(); | |
2398 } else if (is_loaded()) { | |
2399 isolate_->compilation_cache()->Enable(); | |
2400 Unload(); | |
2401 } | |
2402 is_active_ = is_active; | |
2403 } | |
2404 | |
2405 | |
2406 // Calls the registered debug message handler. This callback is part of the | |
2407 // public API. | |
2408 void Debug::InvokeMessageHandler(MessageImpl message) { | |
2409 if (message_handler_ != NULL) message_handler_(message); | |
2410 } | |
2411 | |
2412 | |
2413 // Puts a command coming from the public API on the queue. Creates | |
2414 // a copy of the command string managed by the debugger. Up to this | |
2415 // point, the command data was managed by the API client. Called | |
2416 // by the API client thread. | |
2417 void Debug::EnqueueCommandMessage(Vector<const uint16_t> command, | |
2418 v8::Debug::ClientData* client_data) { | |
2419 // Need to cast away const. | |
2420 CommandMessage message = CommandMessage::New( | |
2421 Vector<uint16_t>(const_cast<uint16_t*>(command.start()), | |
2422 command.length()), | |
2423 client_data); | |
2424 isolate_->logger()->DebugTag("Put command on command_queue."); | |
2425 command_queue_.Put(message); | |
2426 command_received_.Signal(); | |
2427 | |
2428 // Set the debug command break flag to have the command processed. | |
2429 if (!in_debug_scope()) isolate_->stack_guard()->RequestDebugCommand(); | |
2430 } | |
2431 | |
2432 | |
2433 MaybeHandle<Object> Debug::Call(Handle<JSFunction> fun, Handle<Object> data) { | |
2434 DebugScope debug_scope(this); | |
2435 if (debug_scope.failed()) return isolate_->factory()->undefined_value(); | |
2436 | |
2437 // Create the execution state. | |
2438 Handle<Object> exec_state; | |
2439 if (!MakeExecutionState().ToHandle(&exec_state)) { | |
2440 return isolate_->factory()->undefined_value(); | |
2441 } | |
2442 | |
2443 Handle<Object> argv[] = { exec_state, data }; | |
2444 return Execution::Call( | |
2445 isolate_, | |
2446 fun, | |
2447 Handle<Object>(debug_context()->global_proxy(), isolate_), | |
2448 arraysize(argv), | |
2449 argv); | |
2450 } | |
2451 | |
2452 | |
2453 void Debug::HandleDebugBreak() { | |
2454 // Ignore debug break during bootstrapping. | |
2455 if (isolate_->bootstrapper()->IsActive()) return; | |
2456 // Just continue if breaks are disabled. | |
2457 if (break_disabled()) return; | |
2458 // Ignore debug break if debugger is not active. | |
2459 if (!is_active()) return; | |
2460 | |
2461 StackLimitCheck check(isolate_); | |
2462 if (check.HasOverflowed()) return; | |
2463 | |
2464 { JavaScriptFrameIterator it(isolate_); | |
2465 DCHECK(!it.done()); | |
2466 Object* fun = it.frame()->function(); | |
2467 if (fun && fun->IsJSFunction()) { | |
2468 // Don't stop in builtin functions. | |
2469 if (JSFunction::cast(fun)->IsBuiltin()) return; | |
2470 GlobalObject* global = JSFunction::cast(fun)->context()->global_object(); | |
2471 // Don't stop in debugger functions. | |
2472 if (IsDebugGlobal(global)) return; | |
2473 } | |
2474 } | |
2475 | |
2476 // Collect the break state before clearing the flags. | |
2477 bool debug_command_only = isolate_->stack_guard()->CheckDebugCommand() && | |
2478 !isolate_->stack_guard()->CheckDebugBreak(); | |
2479 | |
2480 isolate_->stack_guard()->ClearDebugBreak(); | |
2481 | |
2482 ProcessDebugMessages(debug_command_only); | |
2483 } | |
2484 | |
2485 | |
2486 void Debug::ProcessDebugMessages(bool debug_command_only) { | |
2487 isolate_->stack_guard()->ClearDebugCommand(); | |
2488 | |
2489 StackLimitCheck check(isolate_); | |
2490 if (check.HasOverflowed()) return; | |
2491 | |
2492 HandleScope scope(isolate_); | |
2493 DebugScope debug_scope(this); | |
2494 if (debug_scope.failed()) return; | |
2495 | |
2496 // Notify the debug event listeners. Indicate auto continue if the break was | |
2497 // a debug command break. | |
2498 OnDebugBreak(isolate_->factory()->undefined_value(), debug_command_only); | |
2499 } | |
2500 | |
2501 | |
2502 DebugScope::DebugScope(Debug* debug) | |
2503 : debug_(debug), | |
2504 prev_(debug->debugger_entry()), | |
2505 save_(debug_->isolate_), | |
2506 no_termination_exceptons_(debug_->isolate_, | |
2507 StackGuard::TERMINATE_EXECUTION) { | |
2508 // Link recursive debugger entry. | |
2509 base::NoBarrier_Store(&debug_->thread_local_.current_debug_scope_, | |
2510 reinterpret_cast<base::AtomicWord>(this)); | |
2511 | |
2512 // Store the previous break id and frame id. | |
2513 break_id_ = debug_->break_id(); | |
2514 break_frame_id_ = debug_->break_frame_id(); | |
2515 | |
2516 // Create the new break info. If there is no JavaScript frames there is no | |
2517 // break frame id. | |
2518 JavaScriptFrameIterator it(isolate()); | |
2519 bool has_js_frames = !it.done(); | |
2520 debug_->thread_local_.break_frame_id_ = has_js_frames ? it.frame()->id() | |
2521 : StackFrame::NO_ID; | |
2522 debug_->SetNextBreakId(); | |
2523 | |
2524 debug_->UpdateState(); | |
2525 // Make sure that debugger is loaded and enter the debugger context. | |
2526 // The previous context is kept in save_. | |
2527 failed_ = !debug_->is_loaded(); | |
2528 if (!failed_) isolate()->set_context(*debug->debug_context()); | |
2529 } | |
2530 | |
2531 | |
2532 | |
2533 DebugScope::~DebugScope() { | |
2534 if (!failed_ && prev_ == NULL) { | |
2535 // Clear mirror cache when leaving the debugger. Skip this if there is a | |
2536 // pending exception as clearing the mirror cache calls back into | |
2537 // JavaScript. This can happen if the v8::Debug::Call is used in which | |
2538 // case the exception should end up in the calling code. | |
2539 if (!isolate()->has_pending_exception()) debug_->ClearMirrorCache(); | |
2540 | |
2541 // If there are commands in the queue when leaving the debugger request | |
2542 // that these commands are processed. | |
2543 if (debug_->has_commands()) isolate()->stack_guard()->RequestDebugCommand(); | |
2544 } | |
2545 | |
2546 // Leaving this debugger entry. | |
2547 base::NoBarrier_Store(&debug_->thread_local_.current_debug_scope_, | |
2548 reinterpret_cast<base::AtomicWord>(prev_)); | |
2549 | |
2550 // Restore to the previous break state. | |
2551 debug_->thread_local_.break_frame_id_ = break_frame_id_; | |
2552 debug_->thread_local_.break_id_ = break_id_; | |
2553 | |
2554 debug_->UpdateState(); | |
2555 } | |
2556 | |
2557 | |
2558 MessageImpl MessageImpl::NewEvent(DebugEvent event, | |
2559 bool running, | |
2560 Handle<JSObject> exec_state, | |
2561 Handle<JSObject> event_data) { | |
2562 MessageImpl message(true, event, running, | |
2563 exec_state, event_data, Handle<String>(), NULL); | |
2564 return message; | |
2565 } | |
2566 | |
2567 | |
2568 MessageImpl MessageImpl::NewResponse(DebugEvent event, | |
2569 bool running, | |
2570 Handle<JSObject> exec_state, | |
2571 Handle<JSObject> event_data, | |
2572 Handle<String> response_json, | |
2573 v8::Debug::ClientData* client_data) { | |
2574 MessageImpl message(false, event, running, | |
2575 exec_state, event_data, response_json, client_data); | |
2576 return message; | |
2577 } | |
2578 | |
2579 | |
2580 MessageImpl::MessageImpl(bool is_event, | |
2581 DebugEvent event, | |
2582 bool running, | |
2583 Handle<JSObject> exec_state, | |
2584 Handle<JSObject> event_data, | |
2585 Handle<String> response_json, | |
2586 v8::Debug::ClientData* client_data) | |
2587 : is_event_(is_event), | |
2588 event_(event), | |
2589 running_(running), | |
2590 exec_state_(exec_state), | |
2591 event_data_(event_data), | |
2592 response_json_(response_json), | |
2593 client_data_(client_data) {} | |
2594 | |
2595 | |
2596 bool MessageImpl::IsEvent() const { | |
2597 return is_event_; | |
2598 } | |
2599 | |
2600 | |
2601 bool MessageImpl::IsResponse() const { | |
2602 return !is_event_; | |
2603 } | |
2604 | |
2605 | |
2606 DebugEvent MessageImpl::GetEvent() const { | |
2607 return event_; | |
2608 } | |
2609 | |
2610 | |
2611 bool MessageImpl::WillStartRunning() const { | |
2612 return running_; | |
2613 } | |
2614 | |
2615 | |
2616 v8::Local<v8::Object> MessageImpl::GetExecutionState() const { | |
2617 return v8::Utils::ToLocal(exec_state_); | |
2618 } | |
2619 | |
2620 | |
2621 v8::Isolate* MessageImpl::GetIsolate() const { | |
2622 return reinterpret_cast<v8::Isolate*>(exec_state_->GetIsolate()); | |
2623 } | |
2624 | |
2625 | |
2626 v8::Local<v8::Object> MessageImpl::GetEventData() const { | |
2627 return v8::Utils::ToLocal(event_data_); | |
2628 } | |
2629 | |
2630 | |
2631 v8::Local<v8::String> MessageImpl::GetJSON() const { | |
2632 Isolate* isolate = event_data_->GetIsolate(); | |
2633 v8::EscapableHandleScope scope(reinterpret_cast<v8::Isolate*>(isolate)); | |
2634 | |
2635 if (IsEvent()) { | |
2636 // Call toJSONProtocol on the debug event object. | |
2637 Handle<Object> fun = Object::GetProperty( | |
2638 isolate, event_data_, "toJSONProtocol").ToHandleChecked(); | |
2639 if (!fun->IsJSFunction()) { | |
2640 return v8::Local<v8::String>(); | |
2641 } | |
2642 | |
2643 MaybeHandle<Object> maybe_json = | |
2644 Execution::TryCall(Handle<JSFunction>::cast(fun), event_data_, 0, NULL); | |
2645 Handle<Object> json; | |
2646 if (!maybe_json.ToHandle(&json) || !json->IsString()) { | |
2647 return v8::Local<v8::String>(); | |
2648 } | |
2649 return scope.Escape(v8::Utils::ToLocal(Handle<String>::cast(json))); | |
2650 } else { | |
2651 return v8::Utils::ToLocal(response_json_); | |
2652 } | |
2653 } | |
2654 | |
2655 | |
2656 v8::Local<v8::Context> MessageImpl::GetEventContext() const { | |
2657 Isolate* isolate = event_data_->GetIsolate(); | |
2658 v8::Local<v8::Context> context = GetDebugEventContext(isolate); | |
2659 // Isolate::context() may be NULL when "script collected" event occurs. | |
2660 DCHECK(!context.IsEmpty()); | |
2661 return context; | |
2662 } | |
2663 | |
2664 | |
2665 v8::Debug::ClientData* MessageImpl::GetClientData() const { | |
2666 return client_data_; | |
2667 } | |
2668 | |
2669 | |
2670 EventDetailsImpl::EventDetailsImpl(DebugEvent event, | |
2671 Handle<JSObject> exec_state, | |
2672 Handle<JSObject> event_data, | |
2673 Handle<Object> callback_data, | |
2674 v8::Debug::ClientData* client_data) | |
2675 : event_(event), | |
2676 exec_state_(exec_state), | |
2677 event_data_(event_data), | |
2678 callback_data_(callback_data), | |
2679 client_data_(client_data) {} | |
2680 | |
2681 | |
2682 DebugEvent EventDetailsImpl::GetEvent() const { | |
2683 return event_; | |
2684 } | |
2685 | |
2686 | |
2687 v8::Local<v8::Object> EventDetailsImpl::GetExecutionState() const { | |
2688 return v8::Utils::ToLocal(exec_state_); | |
2689 } | |
2690 | |
2691 | |
2692 v8::Local<v8::Object> EventDetailsImpl::GetEventData() const { | |
2693 return v8::Utils::ToLocal(event_data_); | |
2694 } | |
2695 | |
2696 | |
2697 v8::Local<v8::Context> EventDetailsImpl::GetEventContext() const { | |
2698 return GetDebugEventContext(exec_state_->GetIsolate()); | |
2699 } | |
2700 | |
2701 | |
2702 v8::Local<v8::Value> EventDetailsImpl::GetCallbackData() const { | |
2703 return v8::Utils::ToLocal(callback_data_); | |
2704 } | |
2705 | |
2706 | |
2707 v8::Debug::ClientData* EventDetailsImpl::GetClientData() const { | |
2708 return client_data_; | |
2709 } | |
2710 | |
2711 | |
2712 CommandMessage::CommandMessage() : text_(Vector<uint16_t>::empty()), | |
2713 client_data_(NULL) { | |
2714 } | |
2715 | |
2716 | |
2717 CommandMessage::CommandMessage(const Vector<uint16_t>& text, | |
2718 v8::Debug::ClientData* data) | |
2719 : text_(text), | |
2720 client_data_(data) { | |
2721 } | |
2722 | |
2723 | |
2724 void CommandMessage::Dispose() { | |
2725 text_.Dispose(); | |
2726 delete client_data_; | |
2727 client_data_ = NULL; | |
2728 } | |
2729 | |
2730 | |
2731 CommandMessage CommandMessage::New(const Vector<uint16_t>& command, | |
2732 v8::Debug::ClientData* data) { | |
2733 return CommandMessage(command.Clone(), data); | |
2734 } | |
2735 | |
2736 | |
2737 CommandMessageQueue::CommandMessageQueue(int size) : start_(0), end_(0), | |
2738 size_(size) { | |
2739 messages_ = NewArray<CommandMessage>(size); | |
2740 } | |
2741 | |
2742 | |
2743 CommandMessageQueue::~CommandMessageQueue() { | |
2744 while (!IsEmpty()) Get().Dispose(); | |
2745 DeleteArray(messages_); | |
2746 } | |
2747 | |
2748 | |
2749 CommandMessage CommandMessageQueue::Get() { | |
2750 DCHECK(!IsEmpty()); | |
2751 int result = start_; | |
2752 start_ = (start_ + 1) % size_; | |
2753 return messages_[result]; | |
2754 } | |
2755 | |
2756 | |
2757 void CommandMessageQueue::Put(const CommandMessage& message) { | |
2758 if ((end_ + 1) % size_ == start_) { | |
2759 Expand(); | |
2760 } | |
2761 messages_[end_] = message; | |
2762 end_ = (end_ + 1) % size_; | |
2763 } | |
2764 | |
2765 | |
2766 void CommandMessageQueue::Expand() { | |
2767 CommandMessageQueue new_queue(size_ * 2); | |
2768 while (!IsEmpty()) { | |
2769 new_queue.Put(Get()); | |
2770 } | |
2771 CommandMessage* array_to_free = messages_; | |
2772 *this = new_queue; | |
2773 new_queue.messages_ = array_to_free; | |
2774 // Make the new_queue empty so that it doesn't call Dispose on any messages. | |
2775 new_queue.start_ = new_queue.end_; | |
2776 // Automatic destructor called on new_queue, freeing array_to_free. | |
2777 } | |
2778 | |
2779 | |
2780 LockingCommandMessageQueue::LockingCommandMessageQueue(Logger* logger, int size) | |
2781 : logger_(logger), queue_(size) {} | |
2782 | |
2783 | |
2784 bool LockingCommandMessageQueue::IsEmpty() const { | |
2785 base::LockGuard<base::Mutex> lock_guard(&mutex_); | |
2786 return queue_.IsEmpty(); | |
2787 } | |
2788 | |
2789 | |
2790 CommandMessage LockingCommandMessageQueue::Get() { | |
2791 base::LockGuard<base::Mutex> lock_guard(&mutex_); | |
2792 CommandMessage result = queue_.Get(); | |
2793 logger_->DebugEvent("Get", result.text()); | |
2794 return result; | |
2795 } | |
2796 | |
2797 | |
2798 void LockingCommandMessageQueue::Put(const CommandMessage& message) { | |
2799 base::LockGuard<base::Mutex> lock_guard(&mutex_); | |
2800 queue_.Put(message); | |
2801 logger_->DebugEvent("Put", message.text()); | |
2802 } | |
2803 | |
2804 | |
2805 void LockingCommandMessageQueue::Clear() { | |
2806 base::LockGuard<base::Mutex> lock_guard(&mutex_); | |
2807 queue_.Clear(); | |
2808 } | |
2809 | |
2810 } // namespace internal | |
2811 } // namespace v8 | |
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