| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/v8.h" |
| |
| #include "src/api.h" |
| #include "src/arguments.h" |
| #include "src/bootstrapper.h" |
| #include "src/code-stubs.h" |
| #include "src/codegen.h" |
| #include "src/compilation-cache.h" |
| #include "src/compiler.h" |
| #include "src/debug.h" |
| #include "src/deoptimizer.h" |
| #include "src/execution.h" |
| #include "src/full-codegen.h" |
| #include "src/global-handles.h" |
| #include "src/isolate-inl.h" |
| #include "src/list.h" |
| #include "src/log.h" |
| #include "src/messages.h" |
| #include "src/natives.h" |
| |
| #include "include/v8-debug.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| Debug::Debug(Isolate* isolate) |
| : debug_context_(Handle<Context>()), |
| event_listener_(Handle<Object>()), |
| event_listener_data_(Handle<Object>()), |
| message_handler_(NULL), |
| command_received_(0), |
| command_queue_(isolate->logger(), kQueueInitialSize), |
| event_command_queue_(isolate->logger(), kQueueInitialSize), |
| is_active_(false), |
| is_suppressed_(false), |
| live_edit_enabled_(true), // TODO(yangguo): set to false by default. |
| has_break_points_(false), |
| break_disabled_(false), |
| break_on_exception_(false), |
| break_on_uncaught_exception_(false), |
| script_cache_(NULL), |
| debug_info_list_(NULL), |
| isolate_(isolate) { |
| ThreadInit(); |
| } |
| |
| |
| static v8::Handle<v8::Context> GetDebugEventContext(Isolate* isolate) { |
| Handle<Context> context = isolate->debug()->debugger_entry()->GetContext(); |
| // Isolate::context() may have been NULL when "script collected" event |
| // occured. |
| if (context.is_null()) return v8::Local<v8::Context>(); |
| Handle<Context> native_context(context->native_context()); |
| return v8::Utils::ToLocal(native_context); |
| } |
| |
| |
| BreakLocationIterator::BreakLocationIterator(Handle<DebugInfo> debug_info, |
| BreakLocatorType type) { |
| debug_info_ = debug_info; |
| type_ = type; |
| reloc_iterator_ = NULL; |
| reloc_iterator_original_ = NULL; |
| Reset(); // Initialize the rest of the member variables. |
| } |
| |
| |
| BreakLocationIterator::~BreakLocationIterator() { |
| DCHECK(reloc_iterator_ != NULL); |
| DCHECK(reloc_iterator_original_ != NULL); |
| delete reloc_iterator_; |
| delete reloc_iterator_original_; |
| } |
| |
| |
| // Check whether a code stub with the specified major key is a possible break |
| // point location when looking for source break locations. |
| static bool IsSourceBreakStub(Code* code) { |
| CodeStub::Major major_key = CodeStub::GetMajorKey(code); |
| return major_key == CodeStub::CallFunction; |
| } |
| |
| |
| // Check whether a code stub with the specified major key is a possible break |
| // location. |
| static bool IsBreakStub(Code* code) { |
| CodeStub::Major major_key = CodeStub::GetMajorKey(code); |
| return major_key == CodeStub::CallFunction; |
| } |
| |
| |
| void BreakLocationIterator::Next() { |
| DisallowHeapAllocation no_gc; |
| DCHECK(!RinfoDone()); |
| |
| // Iterate through reloc info for code and original code stopping at each |
| // breakable code target. |
| bool first = break_point_ == -1; |
| while (!RinfoDone()) { |
| if (!first) RinfoNext(); |
| first = false; |
| if (RinfoDone()) return; |
| |
| // Whenever a statement position or (plain) position is passed update the |
| // current value of these. |
| if (RelocInfo::IsPosition(rmode())) { |
| if (RelocInfo::IsStatementPosition(rmode())) { |
| statement_position_ = static_cast<int>( |
| rinfo()->data() - debug_info_->shared()->start_position()); |
| } |
| // Always update the position as we don't want that to be before the |
| // statement position. |
| position_ = static_cast<int>( |
| rinfo()->data() - debug_info_->shared()->start_position()); |
| DCHECK(position_ >= 0); |
| DCHECK(statement_position_ >= 0); |
| } |
| |
| if (IsDebugBreakSlot()) { |
| // There is always a possible break point at a debug break slot. |
| break_point_++; |
| return; |
| } else if (RelocInfo::IsCodeTarget(rmode())) { |
| // Check for breakable code target. Look in the original code as setting |
| // break points can cause the code targets in the running (debugged) code |
| // to be of a different kind than in the original code. |
| Address target = original_rinfo()->target_address(); |
| Code* code = Code::GetCodeFromTargetAddress(target); |
| if ((code->is_inline_cache_stub() && |
| !code->is_binary_op_stub() && |
| !code->is_compare_ic_stub() && |
| !code->is_to_boolean_ic_stub()) || |
| RelocInfo::IsConstructCall(rmode())) { |
| break_point_++; |
| return; |
| } |
| if (code->kind() == Code::STUB) { |
| if (IsDebuggerStatement()) { |
| break_point_++; |
| return; |
| } else if (type_ == ALL_BREAK_LOCATIONS) { |
| if (IsBreakStub(code)) { |
| break_point_++; |
| return; |
| } |
| } else { |
| DCHECK(type_ == SOURCE_BREAK_LOCATIONS); |
| if (IsSourceBreakStub(code)) { |
| break_point_++; |
| return; |
| } |
| } |
| } |
| } |
| |
| // Check for break at return. |
| if (RelocInfo::IsJSReturn(rmode())) { |
| // Set the positions to the end of the function. |
| if (debug_info_->shared()->HasSourceCode()) { |
| position_ = debug_info_->shared()->end_position() - |
| debug_info_->shared()->start_position() - 1; |
| } else { |
| position_ = 0; |
| } |
| statement_position_ = position_; |
| break_point_++; |
| return; |
| } |
| } |
| } |
| |
| |
| void BreakLocationIterator::Next(int count) { |
| while (count > 0) { |
| Next(); |
| count--; |
| } |
| } |
| |
| |
| // Find the break point at the supplied address, or the closest one before |
| // the address. |
| void BreakLocationIterator::FindBreakLocationFromAddress(Address pc) { |
| // Run through all break points to locate the one closest to the address. |
| int closest_break_point = 0; |
| int distance = kMaxInt; |
| while (!Done()) { |
| // Check if this break point is closer that what was previously found. |
| if (this->pc() <= pc && pc - this->pc() < distance) { |
| closest_break_point = break_point(); |
| distance = static_cast<int>(pc - this->pc()); |
| // Check whether we can't get any closer. |
| if (distance == 0) break; |
| } |
| Next(); |
| } |
| |
| // Move to the break point found. |
| Reset(); |
| Next(closest_break_point); |
| } |
| |
| |
| // Find the break point closest to the supplied source position. |
| void BreakLocationIterator::FindBreakLocationFromPosition(int position, |
| BreakPositionAlignment alignment) { |
| // Run through all break points to locate the one closest to the source |
| // position. |
| int closest_break_point = 0; |
| int distance = kMaxInt; |
| |
| while (!Done()) { |
| int next_position; |
| switch (alignment) { |
| case STATEMENT_ALIGNED: |
| next_position = this->statement_position(); |
| break; |
| case BREAK_POSITION_ALIGNED: |
| next_position = this->position(); |
| break; |
| default: |
| UNREACHABLE(); |
| next_position = this->statement_position(); |
| } |
| // Check if this break point is closer that what was previously found. |
| if (position <= next_position && next_position - position < distance) { |
| closest_break_point = break_point(); |
| distance = next_position - position; |
| // Check whether we can't get any closer. |
| if (distance == 0) break; |
| } |
| Next(); |
| } |
| |
| // Move to the break point found. |
| Reset(); |
| Next(closest_break_point); |
| } |
| |
| |
| void BreakLocationIterator::Reset() { |
| // Create relocation iterators for the two code objects. |
| if (reloc_iterator_ != NULL) delete reloc_iterator_; |
| if (reloc_iterator_original_ != NULL) delete reloc_iterator_original_; |
| reloc_iterator_ = new RelocIterator( |
| debug_info_->code(), |
| ~RelocInfo::ModeMask(RelocInfo::CODE_AGE_SEQUENCE)); |
| reloc_iterator_original_ = new RelocIterator( |
| debug_info_->original_code(), |
| ~RelocInfo::ModeMask(RelocInfo::CODE_AGE_SEQUENCE)); |
| |
| // Position at the first break point. |
| break_point_ = -1; |
| position_ = 1; |
| statement_position_ = 1; |
| Next(); |
| } |
| |
| |
| bool BreakLocationIterator::Done() const { |
| return RinfoDone(); |
| } |
| |
| |
| void BreakLocationIterator::SetBreakPoint(Handle<Object> break_point_object) { |
| // If there is not already a real break point here patch code with debug |
| // break. |
| if (!HasBreakPoint()) SetDebugBreak(); |
| DCHECK(IsDebugBreak() || IsDebuggerStatement()); |
| // Set the break point information. |
| DebugInfo::SetBreakPoint(debug_info_, code_position(), |
| position(), statement_position(), |
| break_point_object); |
| } |
| |
| |
| void BreakLocationIterator::ClearBreakPoint(Handle<Object> break_point_object) { |
| // Clear the break point information. |
| DebugInfo::ClearBreakPoint(debug_info_, code_position(), break_point_object); |
| // If there are no more break points here remove the debug break. |
| if (!HasBreakPoint()) { |
| ClearDebugBreak(); |
| DCHECK(!IsDebugBreak()); |
| } |
| } |
| |
| |
| void BreakLocationIterator::SetOneShot() { |
| // Debugger statement always calls debugger. No need to modify it. |
| if (IsDebuggerStatement()) return; |
| |
| // If there is a real break point here no more to do. |
| if (HasBreakPoint()) { |
| DCHECK(IsDebugBreak()); |
| return; |
| } |
| |
| // Patch code with debug break. |
| SetDebugBreak(); |
| } |
| |
| |
| void BreakLocationIterator::ClearOneShot() { |
| // Debugger statement always calls debugger. No need to modify it. |
| if (IsDebuggerStatement()) return; |
| |
| // If there is a real break point here no more to do. |
| if (HasBreakPoint()) { |
| DCHECK(IsDebugBreak()); |
| return; |
| } |
| |
| // Patch code removing debug break. |
| ClearDebugBreak(); |
| DCHECK(!IsDebugBreak()); |
| } |
| |
| |
| void BreakLocationIterator::SetDebugBreak() { |
| // Debugger statement always calls debugger. No need to modify it. |
| if (IsDebuggerStatement()) return; |
| |
| // If there is already a break point here just return. This might happen if |
| // the same code is flooded with break points twice. Flooding the same |
| // function twice might happen when stepping in a function with an exception |
| // handler as the handler and the function is the same. |
| if (IsDebugBreak()) return; |
| |
| if (RelocInfo::IsJSReturn(rmode())) { |
| // Patch the frame exit code with a break point. |
| SetDebugBreakAtReturn(); |
| } else if (IsDebugBreakSlot()) { |
| // Patch the code in the break slot. |
| SetDebugBreakAtSlot(); |
| } else { |
| // Patch the IC call. |
| SetDebugBreakAtIC(); |
| } |
| DCHECK(IsDebugBreak()); |
| } |
| |
| |
| void BreakLocationIterator::ClearDebugBreak() { |
| // Debugger statement always calls debugger. No need to modify it. |
| if (IsDebuggerStatement()) return; |
| |
| if (RelocInfo::IsJSReturn(rmode())) { |
| // Restore the frame exit code. |
| ClearDebugBreakAtReturn(); |
| } else if (IsDebugBreakSlot()) { |
| // Restore the code in the break slot. |
| ClearDebugBreakAtSlot(); |
| } else { |
| // Patch the IC call. |
| ClearDebugBreakAtIC(); |
| } |
| DCHECK(!IsDebugBreak()); |
| } |
| |
| |
| bool BreakLocationIterator::IsStepInLocation(Isolate* isolate) { |
| if (RelocInfo::IsConstructCall(original_rmode())) { |
| return true; |
| } else if (RelocInfo::IsCodeTarget(rmode())) { |
| HandleScope scope(debug_info_->GetIsolate()); |
| Address target = original_rinfo()->target_address(); |
| Handle<Code> target_code(Code::GetCodeFromTargetAddress(target)); |
| if (target_code->kind() == Code::STUB) { |
| return CodeStub::GetMajorKey(*target_code) == CodeStub::CallFunction; |
| } |
| return target_code->is_call_stub(); |
| } |
| return false; |
| } |
| |
| |
| void BreakLocationIterator::PrepareStepIn(Isolate* isolate) { |
| #ifdef DEBUG |
| HandleScope scope(isolate); |
| // Step in can only be prepared if currently positioned on an IC call, |
| // construct call or CallFunction stub call. |
| Address target = rinfo()->target_address(); |
| Handle<Code> target_code(Code::GetCodeFromTargetAddress(target)); |
| // All the following stuff is needed only for assertion checks so the code |
| // is wrapped in ifdef. |
| Handle<Code> maybe_call_function_stub = target_code; |
| if (IsDebugBreak()) { |
| Address original_target = original_rinfo()->target_address(); |
| maybe_call_function_stub = |
| Handle<Code>(Code::GetCodeFromTargetAddress(original_target)); |
| } |
| bool is_call_function_stub = |
| (maybe_call_function_stub->kind() == Code::STUB && |
| CodeStub::GetMajorKey(*maybe_call_function_stub) == |
| CodeStub::CallFunction); |
| |
| // Step in through construct call requires no changes to the running code. |
| // Step in through getters/setters should already be prepared as well |
| // because caller of this function (Debug::PrepareStep) is expected to |
| // flood the top frame's function with one shot breakpoints. |
| // Step in through CallFunction stub should also be prepared by caller of |
| // this function (Debug::PrepareStep) which should flood target function |
| // with breakpoints. |
| DCHECK(RelocInfo::IsConstructCall(rmode()) || |
| target_code->is_inline_cache_stub() || |
| is_call_function_stub); |
| #endif |
| } |
| |
| |
| // Check whether the break point is at a position which will exit the function. |
| bool BreakLocationIterator::IsExit() const { |
| return (RelocInfo::IsJSReturn(rmode())); |
| } |
| |
| |
| bool BreakLocationIterator::HasBreakPoint() { |
| return debug_info_->HasBreakPoint(code_position()); |
| } |
| |
| |
| // Check whether there is a debug break at the current position. |
| bool BreakLocationIterator::IsDebugBreak() { |
| if (RelocInfo::IsJSReturn(rmode())) { |
| return IsDebugBreakAtReturn(); |
| } else if (IsDebugBreakSlot()) { |
| return IsDebugBreakAtSlot(); |
| } else { |
| return Debug::IsDebugBreak(rinfo()->target_address()); |
| } |
| } |
| |
| |
| // Find the builtin to use for invoking the debug break |
| static Handle<Code> DebugBreakForIC(Handle<Code> code, RelocInfo::Mode mode) { |
| Isolate* isolate = code->GetIsolate(); |
| |
| // Find the builtin debug break function matching the calling convention |
| // used by the call site. |
| if (code->is_inline_cache_stub()) { |
| switch (code->kind()) { |
| case Code::CALL_IC: |
| return isolate->builtins()->CallICStub_DebugBreak(); |
| |
| case Code::LOAD_IC: |
| return isolate->builtins()->LoadIC_DebugBreak(); |
| |
| case Code::STORE_IC: |
| return isolate->builtins()->StoreIC_DebugBreak(); |
| |
| case Code::KEYED_LOAD_IC: |
| return isolate->builtins()->KeyedLoadIC_DebugBreak(); |
| |
| case Code::KEYED_STORE_IC: |
| return isolate->builtins()->KeyedStoreIC_DebugBreak(); |
| |
| case Code::COMPARE_NIL_IC: |
| return isolate->builtins()->CompareNilIC_DebugBreak(); |
| |
| default: |
| UNREACHABLE(); |
| } |
| } |
| if (RelocInfo::IsConstructCall(mode)) { |
| if (code->has_function_cache()) { |
| return isolate->builtins()->CallConstructStub_Recording_DebugBreak(); |
| } else { |
| return isolate->builtins()->CallConstructStub_DebugBreak(); |
| } |
| } |
| if (code->kind() == Code::STUB) { |
| DCHECK(CodeStub::GetMajorKey(*code) == CodeStub::CallFunction); |
| return isolate->builtins()->CallFunctionStub_DebugBreak(); |
| } |
| |
| UNREACHABLE(); |
| return Handle<Code>::null(); |
| } |
| |
| |
| void BreakLocationIterator::SetDebugBreakAtIC() { |
| // Patch the original code with the current address as the current address |
| // might have changed by the inline caching since the code was copied. |
| original_rinfo()->set_target_address(rinfo()->target_address()); |
| |
| RelocInfo::Mode mode = rmode(); |
| if (RelocInfo::IsCodeTarget(mode)) { |
| Address target = rinfo()->target_address(); |
| Handle<Code> target_code(Code::GetCodeFromTargetAddress(target)); |
| |
| // Patch the code to invoke the builtin debug break function matching the |
| // calling convention used by the call site. |
| Handle<Code> dbgbrk_code = DebugBreakForIC(target_code, mode); |
| rinfo()->set_target_address(dbgbrk_code->entry()); |
| } |
| } |
| |
| |
| void BreakLocationIterator::ClearDebugBreakAtIC() { |
| // Patch the code to the original invoke. |
| rinfo()->set_target_address(original_rinfo()->target_address()); |
| } |
| |
| |
| bool BreakLocationIterator::IsDebuggerStatement() { |
| return RelocInfo::DEBUG_BREAK == rmode(); |
| } |
| |
| |
| bool BreakLocationIterator::IsDebugBreakSlot() { |
| return RelocInfo::DEBUG_BREAK_SLOT == rmode(); |
| } |
| |
| |
| Object* BreakLocationIterator::BreakPointObjects() { |
| return debug_info_->GetBreakPointObjects(code_position()); |
| } |
| |
| |
| // Clear out all the debug break code. This is ONLY supposed to be used when |
| // shutting down the debugger as it will leave the break point information in |
| // DebugInfo even though the code is patched back to the non break point state. |
| void BreakLocationIterator::ClearAllDebugBreak() { |
| while (!Done()) { |
| ClearDebugBreak(); |
| Next(); |
| } |
| } |
| |
| |
| bool BreakLocationIterator::RinfoDone() const { |
| DCHECK(reloc_iterator_->done() == reloc_iterator_original_->done()); |
| return reloc_iterator_->done(); |
| } |
| |
| |
| void BreakLocationIterator::RinfoNext() { |
| reloc_iterator_->next(); |
| reloc_iterator_original_->next(); |
| #ifdef DEBUG |
| DCHECK(reloc_iterator_->done() == reloc_iterator_original_->done()); |
| if (!reloc_iterator_->done()) { |
| DCHECK(rmode() == original_rmode()); |
| } |
| #endif |
| } |
| |
| |
| // Threading support. |
| void Debug::ThreadInit() { |
| thread_local_.break_count_ = 0; |
| thread_local_.break_id_ = 0; |
| thread_local_.break_frame_id_ = StackFrame::NO_ID; |
| thread_local_.last_step_action_ = StepNone; |
| thread_local_.last_statement_position_ = RelocInfo::kNoPosition; |
| thread_local_.step_count_ = 0; |
| thread_local_.last_fp_ = 0; |
| thread_local_.queued_step_count_ = 0; |
| thread_local_.step_into_fp_ = 0; |
| thread_local_.step_out_fp_ = 0; |
| // TODO(isolates): frames_are_dropped_? |
| thread_local_.current_debug_scope_ = NULL; |
| thread_local_.restarter_frame_function_pointer_ = NULL; |
| } |
| |
| |
| char* Debug::ArchiveDebug(char* storage) { |
| char* to = storage; |
| MemCopy(to, reinterpret_cast<char*>(&thread_local_), sizeof(ThreadLocal)); |
| ThreadInit(); |
| return storage + ArchiveSpacePerThread(); |
| } |
| |
| |
| char* Debug::RestoreDebug(char* storage) { |
| char* from = storage; |
| MemCopy(reinterpret_cast<char*>(&thread_local_), from, sizeof(ThreadLocal)); |
| return storage + ArchiveSpacePerThread(); |
| } |
| |
| |
| int Debug::ArchiveSpacePerThread() { |
| return sizeof(ThreadLocal); |
| } |
| |
| |
| ScriptCache::ScriptCache(Isolate* isolate) : HashMap(HashMap::PointersMatch), |
| isolate_(isolate) { |
| Heap* heap = isolate_->heap(); |
| HandleScope scope(isolate_); |
| |
| // Perform two GCs to get rid of all unreferenced scripts. The first GC gets |
| // rid of all the cached script wrappers and the second gets rid of the |
| // scripts which are no longer referenced. |
| heap->CollectAllGarbage(Heap::kMakeHeapIterableMask, "ScriptCache"); |
| heap->CollectAllGarbage(Heap::kMakeHeapIterableMask, "ScriptCache"); |
| |
| // Scan heap for Script objects. |
| HeapIterator iterator(heap); |
| DisallowHeapAllocation no_allocation; |
| |
| for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) { |
| if (obj->IsScript() && Script::cast(obj)->HasValidSource()) { |
| Add(Handle<Script>(Script::cast(obj))); |
| } |
| } |
| } |
| |
| |
| void ScriptCache::Add(Handle<Script> script) { |
| GlobalHandles* global_handles = isolate_->global_handles(); |
| // Create an entry in the hash map for the script. |
| int id = script->id()->value(); |
| HashMap::Entry* entry = |
| HashMap::Lookup(reinterpret_cast<void*>(id), Hash(id), true); |
| if (entry->value != NULL) { |
| #ifdef DEBUG |
| // The code deserializer may introduce duplicate Script objects. |
| // Assert that the Script objects with the same id have the same name. |
| Handle<Script> found(reinterpret_cast<Script**>(entry->value)); |
| DCHECK(script->id() == found->id()); |
| DCHECK(!script->name()->IsString() || |
| String::cast(script->name())->Equals(String::cast(found->name()))); |
| #endif |
| return; |
| } |
| // Globalize the script object, make it weak and use the location of the |
| // global handle as the value in the hash map. |
| Handle<Script> script_ = |
| Handle<Script>::cast(global_handles->Create(*script)); |
| GlobalHandles::MakeWeak(reinterpret_cast<Object**>(script_.location()), |
| this, |
| ScriptCache::HandleWeakScript); |
| entry->value = script_.location(); |
| } |
| |
| |
| Handle<FixedArray> ScriptCache::GetScripts() { |
| Factory* factory = isolate_->factory(); |
| Handle<FixedArray> instances = factory->NewFixedArray(occupancy()); |
| int count = 0; |
| for (HashMap::Entry* entry = Start(); entry != NULL; entry = Next(entry)) { |
| DCHECK(entry->value != NULL); |
| if (entry->value != NULL) { |
| instances->set(count, *reinterpret_cast<Script**>(entry->value)); |
| count++; |
| } |
| } |
| return instances; |
| } |
| |
| |
| void ScriptCache::Clear() { |
| // Iterate the script cache to get rid of all the weak handles. |
| for (HashMap::Entry* entry = Start(); entry != NULL; entry = Next(entry)) { |
| DCHECK(entry != NULL); |
| Object** location = reinterpret_cast<Object**>(entry->value); |
| DCHECK((*location)->IsScript()); |
| GlobalHandles::ClearWeakness(location); |
| GlobalHandles::Destroy(location); |
| } |
| // Clear the content of the hash map. |
| HashMap::Clear(); |
| } |
| |
| |
| void ScriptCache::HandleWeakScript( |
| const v8::WeakCallbackData<v8::Value, void>& data) { |
| // Retrieve the script identifier. |
| Handle<Object> object = Utils::OpenHandle(*data.GetValue()); |
| int id = Handle<Script>::cast(object)->id()->value(); |
| void* key = reinterpret_cast<void*>(id); |
| uint32_t hash = Hash(id); |
| |
| // Remove the corresponding entry from the cache. |
| ScriptCache* script_cache = |
| reinterpret_cast<ScriptCache*>(data.GetParameter()); |
| HashMap::Entry* entry = script_cache->Lookup(key, hash, false); |
| Object** location = reinterpret_cast<Object**>(entry->value); |
| script_cache->Remove(key, hash); |
| |
| // Clear the weak handle. |
| GlobalHandles::Destroy(location); |
| } |
| |
| |
| void Debug::HandleWeakDebugInfo( |
| const v8::WeakCallbackData<v8::Value, void>& data) { |
| Debug* debug = reinterpret_cast<Isolate*>(data.GetIsolate())->debug(); |
| DebugInfoListNode* node = |
| reinterpret_cast<DebugInfoListNode*>(data.GetParameter()); |
| // We need to clear all breakpoints associated with the function to restore |
| // original code and avoid patching the code twice later because |
| // the function will live in the heap until next gc, and can be found by |
| // Debug::FindSharedFunctionInfoInScript. |
| BreakLocationIterator it(node->debug_info(), ALL_BREAK_LOCATIONS); |
| it.ClearAllDebugBreak(); |
| debug->RemoveDebugInfo(node->debug_info()); |
| #ifdef DEBUG |
| for (DebugInfoListNode* n = debug->debug_info_list_; |
| n != NULL; |
| n = n->next()) { |
| DCHECK(n != node); |
| } |
| #endif |
| } |
| |
| |
| DebugInfoListNode::DebugInfoListNode(DebugInfo* debug_info): next_(NULL) { |
| // Globalize the request debug info object and make it weak. |
| GlobalHandles* global_handles = debug_info->GetIsolate()->global_handles(); |
| debug_info_ = Handle<DebugInfo>::cast(global_handles->Create(debug_info)); |
| GlobalHandles::MakeWeak(reinterpret_cast<Object**>(debug_info_.location()), |
| this, |
| Debug::HandleWeakDebugInfo); |
| } |
| |
| |
| DebugInfoListNode::~DebugInfoListNode() { |
| GlobalHandles::Destroy(reinterpret_cast<Object**>(debug_info_.location())); |
| } |
| |
| |
| bool Debug::CompileDebuggerScript(Isolate* isolate, int index) { |
| Factory* factory = isolate->factory(); |
| HandleScope scope(isolate); |
| |
| // Bail out if the index is invalid. |
| if (index == -1) return false; |
| |
| // Find source and name for the requested script. |
| Handle<String> source_code = |
| isolate->bootstrapper()->NativesSourceLookup(index); |
| Vector<const char> name = Natives::GetScriptName(index); |
| Handle<String> script_name = |
| factory->NewStringFromAscii(name).ToHandleChecked(); |
| Handle<Context> context = isolate->native_context(); |
| |
| // Compile the script. |
| Handle<SharedFunctionInfo> function_info; |
| function_info = Compiler::CompileScript( |
| source_code, script_name, 0, 0, false, context, NULL, NULL, |
| ScriptCompiler::kNoCompileOptions, NATIVES_CODE); |
| |
| // Silently ignore stack overflows during compilation. |
| if (function_info.is_null()) { |
| DCHECK(isolate->has_pending_exception()); |
| isolate->clear_pending_exception(); |
| return false; |
| } |
| |
| // Execute the shared function in the debugger context. |
| Handle<JSFunction> function = |
| factory->NewFunctionFromSharedFunctionInfo(function_info, context); |
| |
| MaybeHandle<Object> maybe_exception; |
| MaybeHandle<Object> result = Execution::TryCall( |
| function, handle(context->global_proxy()), 0, NULL, &maybe_exception); |
| |
| // Check for caught exceptions. |
| if (result.is_null()) { |
| DCHECK(!isolate->has_pending_exception()); |
| MessageLocation computed_location; |
| isolate->ComputeLocation(&computed_location); |
| Handle<Object> message = MessageHandler::MakeMessageObject( |
| isolate, "error_loading_debugger", &computed_location, |
| Vector<Handle<Object> >::empty(), Handle<JSArray>()); |
| DCHECK(!isolate->has_pending_exception()); |
| Handle<Object> exception; |
| if (maybe_exception.ToHandle(&exception)) { |
| isolate->set_pending_exception(*exception); |
| MessageHandler::ReportMessage(isolate, NULL, message); |
| isolate->clear_pending_exception(); |
| } |
| return false; |
| } |
| |
| // Mark this script as native and return successfully. |
| Handle<Script> script(Script::cast(function->shared()->script())); |
| script->set_type(Smi::FromInt(Script::TYPE_NATIVE)); |
| return true; |
| } |
| |
| |
| bool Debug::Load() { |
| // Return if debugger is already loaded. |
| if (is_loaded()) return true; |
| |
| // Bail out if we're already in the process of compiling the native |
| // JavaScript source code for the debugger. |
| if (is_suppressed_) return false; |
| SuppressDebug while_loading(this); |
| |
| // Disable breakpoints and interrupts while compiling and running the |
| // debugger scripts including the context creation code. |
| DisableBreak disable(this, true); |
| PostponeInterruptsScope postpone(isolate_); |
| |
| // Create the debugger context. |
| HandleScope scope(isolate_); |
| ExtensionConfiguration no_extensions; |
| Handle<Context> context = |
| isolate_->bootstrapper()->CreateEnvironment( |
| MaybeHandle<JSGlobalProxy>(), |
| v8::Handle<ObjectTemplate>(), |
| &no_extensions); |
| |
| // Fail if no context could be created. |
| if (context.is_null()) return false; |
| |
| // Use the debugger context. |
| SaveContext save(isolate_); |
| isolate_->set_context(*context); |
| |
| // Expose the builtins object in the debugger context. |
| Handle<String> key = isolate_->factory()->InternalizeOneByteString( |
| STATIC_CHAR_VECTOR("builtins")); |
| Handle<GlobalObject> global = |
| Handle<GlobalObject>(context->global_object(), isolate_); |
| Handle<JSBuiltinsObject> builtin = |
| Handle<JSBuiltinsObject>(global->builtins(), isolate_); |
| RETURN_ON_EXCEPTION_VALUE( |
| isolate_, Object::SetProperty(global, key, builtin, SLOPPY), false); |
| |
| // Compile the JavaScript for the debugger in the debugger context. |
| bool caught_exception = |
| !CompileDebuggerScript(isolate_, Natives::GetIndex("mirror")) || |
| !CompileDebuggerScript(isolate_, Natives::GetIndex("debug")); |
| |
| if (FLAG_enable_liveedit) { |
| caught_exception = caught_exception || |
| !CompileDebuggerScript(isolate_, Natives::GetIndex("liveedit")); |
| } |
| // Check for caught exceptions. |
| if (caught_exception) return false; |
| |
| debug_context_ = Handle<Context>::cast( |
| isolate_->global_handles()->Create(*context)); |
| return true; |
| } |
| |
| |
| void Debug::Unload() { |
| ClearAllBreakPoints(); |
| ClearStepping(); |
| |
| // Return debugger is not loaded. |
| if (!is_loaded()) return; |
| |
| // Clear the script cache. |
| if (script_cache_ != NULL) { |
| delete script_cache_; |
| script_cache_ = NULL; |
| } |
| |
| // Clear debugger context global handle. |
| GlobalHandles::Destroy(Handle<Object>::cast(debug_context_).location()); |
| debug_context_ = Handle<Context>(); |
| } |
| |
| |
| void Debug::Break(Arguments args, JavaScriptFrame* frame) { |
| Heap* heap = isolate_->heap(); |
| HandleScope scope(isolate_); |
| DCHECK(args.length() == 0); |
| |
| // Initialize LiveEdit. |
| LiveEdit::InitializeThreadLocal(this); |
| |
| // Just continue if breaks are disabled or debugger cannot be loaded. |
| if (break_disabled_) return; |
| |
| // Enter the debugger. |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return; |
| |
| // Postpone interrupt during breakpoint processing. |
| PostponeInterruptsScope postpone(isolate_); |
| |
| // Get the debug info (create it if it does not exist). |
| Handle<SharedFunctionInfo> shared = |
| Handle<SharedFunctionInfo>(frame->function()->shared()); |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| |
| // Find the break point where execution has stopped. |
| BreakLocationIterator break_location_iterator(debug_info, |
| ALL_BREAK_LOCATIONS); |
| // pc points to the instruction after the current one, possibly a break |
| // location as well. So the "- 1" to exclude it from the search. |
| break_location_iterator.FindBreakLocationFromAddress(frame->pc() - 1); |
| |
| // Check whether step next reached a new statement. |
| if (!StepNextContinue(&break_location_iterator, frame)) { |
| // Decrease steps left if performing multiple steps. |
| if (thread_local_.step_count_ > 0) { |
| thread_local_.step_count_--; |
| } |
| } |
| |
| // If there is one or more real break points check whether any of these are |
| // triggered. |
| Handle<Object> break_points_hit(heap->undefined_value(), isolate_); |
| if (break_location_iterator.HasBreakPoint()) { |
| Handle<Object> break_point_objects = |
| Handle<Object>(break_location_iterator.BreakPointObjects(), isolate_); |
| break_points_hit = CheckBreakPoints(break_point_objects); |
| } |
| |
| // If step out is active skip everything until the frame where we need to step |
| // out to is reached, unless real breakpoint is hit. |
| if (StepOutActive() && |
| frame->fp() != thread_local_.step_out_fp_ && |
| break_points_hit->IsUndefined() ) { |
| // Step count should always be 0 for StepOut. |
| DCHECK(thread_local_.step_count_ == 0); |
| } else if (!break_points_hit->IsUndefined() || |
| (thread_local_.last_step_action_ != StepNone && |
| thread_local_.step_count_ == 0)) { |
| // Notify debugger if a real break point is triggered or if performing |
| // single stepping with no more steps to perform. Otherwise do another step. |
| |
| // Clear all current stepping setup. |
| ClearStepping(); |
| |
| if (thread_local_.queued_step_count_ > 0) { |
| // Perform queued steps |
| int step_count = thread_local_.queued_step_count_; |
| |
| // Clear queue |
| thread_local_.queued_step_count_ = 0; |
| |
| PrepareStep(StepNext, step_count, StackFrame::NO_ID); |
| } else { |
| // Notify the debug event listeners. |
| OnDebugBreak(break_points_hit, false); |
| } |
| } else if (thread_local_.last_step_action_ != StepNone) { |
| // Hold on to last step action as it is cleared by the call to |
| // ClearStepping. |
| StepAction step_action = thread_local_.last_step_action_; |
| int step_count = thread_local_.step_count_; |
| |
| // If StepNext goes deeper in code, StepOut until original frame |
| // and keep step count queued up in the meantime. |
| if (step_action == StepNext && frame->fp() < thread_local_.last_fp_) { |
| // Count frames until target frame |
| int count = 0; |
| JavaScriptFrameIterator it(isolate_); |
| while (!it.done() && it.frame()->fp() < thread_local_.last_fp_) { |
| count++; |
| it.Advance(); |
| } |
| |
| // Check that we indeed found the frame we are looking for. |
| CHECK(!it.done() && (it.frame()->fp() == thread_local_.last_fp_)); |
| if (step_count > 1) { |
| // Save old count and action to continue stepping after StepOut. |
| thread_local_.queued_step_count_ = step_count - 1; |
| } |
| |
| // Set up for StepOut to reach target frame. |
| step_action = StepOut; |
| step_count = count; |
| } |
| |
| // Clear all current stepping setup. |
| ClearStepping(); |
| |
| // Set up for the remaining steps. |
| PrepareStep(step_action, step_count, StackFrame::NO_ID); |
| } |
| } |
| |
| |
| RUNTIME_FUNCTION(Debug_Break) { |
| // Get the top-most JavaScript frame. |
| JavaScriptFrameIterator it(isolate); |
| isolate->debug()->Break(args, it.frame()); |
| isolate->debug()->SetAfterBreakTarget(it.frame()); |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| // Check the break point objects for whether one or more are actually |
| // triggered. This function returns a JSArray with the break point objects |
| // which is triggered. |
| Handle<Object> Debug::CheckBreakPoints(Handle<Object> break_point_objects) { |
| Factory* factory = isolate_->factory(); |
| |
| // Count the number of break points hit. If there are multiple break points |
| // they are in a FixedArray. |
| Handle<FixedArray> break_points_hit; |
| int break_points_hit_count = 0; |
| DCHECK(!break_point_objects->IsUndefined()); |
| if (break_point_objects->IsFixedArray()) { |
| Handle<FixedArray> array(FixedArray::cast(*break_point_objects)); |
| break_points_hit = factory->NewFixedArray(array->length()); |
| for (int i = 0; i < array->length(); i++) { |
| Handle<Object> o(array->get(i), isolate_); |
| if (CheckBreakPoint(o)) { |
| break_points_hit->set(break_points_hit_count++, *o); |
| } |
| } |
| } else { |
| break_points_hit = factory->NewFixedArray(1); |
| if (CheckBreakPoint(break_point_objects)) { |
| break_points_hit->set(break_points_hit_count++, *break_point_objects); |
| } |
| } |
| |
| // Return undefined if no break points were triggered. |
| if (break_points_hit_count == 0) { |
| return factory->undefined_value(); |
| } |
| // Return break points hit as a JSArray. |
| Handle<JSArray> result = factory->NewJSArrayWithElements(break_points_hit); |
| result->set_length(Smi::FromInt(break_points_hit_count)); |
| return result; |
| } |
| |
| |
| // Check whether a single break point object is triggered. |
| bool Debug::CheckBreakPoint(Handle<Object> break_point_object) { |
| Factory* factory = isolate_->factory(); |
| HandleScope scope(isolate_); |
| |
| // Ignore check if break point object is not a JSObject. |
| if (!break_point_object->IsJSObject()) return true; |
| |
| // Get the function IsBreakPointTriggered (defined in debug-debugger.js). |
| Handle<String> is_break_point_triggered_string = |
| factory->InternalizeOneByteString( |
| STATIC_CHAR_VECTOR("IsBreakPointTriggered")); |
| Handle<GlobalObject> debug_global(debug_context()->global_object()); |
| Handle<JSFunction> check_break_point = |
| Handle<JSFunction>::cast(Object::GetProperty( |
| debug_global, is_break_point_triggered_string).ToHandleChecked()); |
| |
| // Get the break id as an object. |
| Handle<Object> break_id = factory->NewNumberFromInt(Debug::break_id()); |
| |
| // Call HandleBreakPointx. |
| Handle<Object> argv[] = { break_id, break_point_object }; |
| Handle<Object> result; |
| if (!Execution::TryCall(check_break_point, |
| isolate_->js_builtins_object(), |
| arraysize(argv), |
| argv).ToHandle(&result)) { |
| return false; |
| } |
| |
| // Return whether the break point is triggered. |
| return result->IsTrue(); |
| } |
| |
| |
| // Check whether the function has debug information. |
| bool Debug::HasDebugInfo(Handle<SharedFunctionInfo> shared) { |
| return !shared->debug_info()->IsUndefined(); |
| } |
| |
| |
| // Return the debug info for this function. EnsureDebugInfo must be called |
| // prior to ensure the debug info has been generated for shared. |
| Handle<DebugInfo> Debug::GetDebugInfo(Handle<SharedFunctionInfo> shared) { |
| DCHECK(HasDebugInfo(shared)); |
| return Handle<DebugInfo>(DebugInfo::cast(shared->debug_info())); |
| } |
| |
| |
| bool Debug::SetBreakPoint(Handle<JSFunction> function, |
| Handle<Object> break_point_object, |
| int* source_position) { |
| HandleScope scope(isolate_); |
| |
| PrepareForBreakPoints(); |
| |
| // Make sure the function is compiled and has set up the debug info. |
| Handle<SharedFunctionInfo> shared(function->shared()); |
| if (!EnsureDebugInfo(shared, function)) { |
| // Return if retrieving debug info failed. |
| return true; |
| } |
| |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| // Source positions starts with zero. |
| DCHECK(*source_position >= 0); |
| |
| // Find the break point and change it. |
| BreakLocationIterator it(debug_info, SOURCE_BREAK_LOCATIONS); |
| it.FindBreakLocationFromPosition(*source_position, STATEMENT_ALIGNED); |
| it.SetBreakPoint(break_point_object); |
| |
| *source_position = it.position(); |
| |
| // At least one active break point now. |
| return debug_info->GetBreakPointCount() > 0; |
| } |
| |
| |
| bool Debug::SetBreakPointForScript(Handle<Script> script, |
| Handle<Object> break_point_object, |
| int* source_position, |
| BreakPositionAlignment alignment) { |
| HandleScope scope(isolate_); |
| |
| PrepareForBreakPoints(); |
| |
| // Obtain shared function info for the function. |
| Object* result = FindSharedFunctionInfoInScript(script, *source_position); |
| if (result->IsUndefined()) return false; |
| |
| // Make sure the function has set up the debug info. |
| Handle<SharedFunctionInfo> shared(SharedFunctionInfo::cast(result)); |
| if (!EnsureDebugInfo(shared, Handle<JSFunction>::null())) { |
| // Return if retrieving debug info failed. |
| return false; |
| } |
| |
| // Find position within function. The script position might be before the |
| // source position of the first function. |
| int position; |
| if (shared->start_position() > *source_position) { |
| position = 0; |
| } else { |
| position = *source_position - shared->start_position(); |
| } |
| |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| // Source positions starts with zero. |
| DCHECK(position >= 0); |
| |
| // Find the break point and change it. |
| BreakLocationIterator it(debug_info, SOURCE_BREAK_LOCATIONS); |
| it.FindBreakLocationFromPosition(position, alignment); |
| it.SetBreakPoint(break_point_object); |
| |
| *source_position = it.position() + shared->start_position(); |
| |
| // At least one active break point now. |
| DCHECK(debug_info->GetBreakPointCount() > 0); |
| return true; |
| } |
| |
| |
| void Debug::ClearBreakPoint(Handle<Object> break_point_object) { |
| HandleScope scope(isolate_); |
| |
| DebugInfoListNode* node = debug_info_list_; |
| while (node != NULL) { |
| Object* result = DebugInfo::FindBreakPointInfo(node->debug_info(), |
| break_point_object); |
| if (!result->IsUndefined()) { |
| // Get information in the break point. |
| BreakPointInfo* break_point_info = BreakPointInfo::cast(result); |
| Handle<DebugInfo> debug_info = node->debug_info(); |
| |
| // Find the break point and clear it. |
| BreakLocationIterator it(debug_info, SOURCE_BREAK_LOCATIONS); |
| it.FindBreakLocationFromAddress(debug_info->code()->entry() + |
| break_point_info->code_position()->value()); |
| it.ClearBreakPoint(break_point_object); |
| |
| // If there are no more break points left remove the debug info for this |
| // function. |
| if (debug_info->GetBreakPointCount() == 0) { |
| RemoveDebugInfo(debug_info); |
| } |
| |
| return; |
| } |
| node = node->next(); |
| } |
| } |
| |
| |
| void Debug::ClearAllBreakPoints() { |
| DebugInfoListNode* node = debug_info_list_; |
| while (node != NULL) { |
| // Remove all debug break code. |
| BreakLocationIterator it(node->debug_info(), ALL_BREAK_LOCATIONS); |
| it.ClearAllDebugBreak(); |
| node = node->next(); |
| } |
| |
| // Remove all debug info. |
| while (debug_info_list_ != NULL) { |
| RemoveDebugInfo(debug_info_list_->debug_info()); |
| } |
| } |
| |
| |
| void Debug::FloodWithOneShot(Handle<JSFunction> function) { |
| PrepareForBreakPoints(); |
| |
| // Make sure the function is compiled and has set up the debug info. |
| Handle<SharedFunctionInfo> shared(function->shared()); |
| if (!EnsureDebugInfo(shared, function)) { |
| // Return if we failed to retrieve the debug info. |
| return; |
| } |
| |
| // Flood the function with break points. |
| BreakLocationIterator it(GetDebugInfo(shared), ALL_BREAK_LOCATIONS); |
| while (!it.Done()) { |
| it.SetOneShot(); |
| it.Next(); |
| } |
| } |
| |
| |
| void Debug::FloodBoundFunctionWithOneShot(Handle<JSFunction> function) { |
| Handle<FixedArray> new_bindings(function->function_bindings()); |
| Handle<Object> bindee(new_bindings->get(JSFunction::kBoundFunctionIndex), |
| isolate_); |
| |
| if (!bindee.is_null() && bindee->IsJSFunction() && |
| !JSFunction::cast(*bindee)->IsFromNativeScript()) { |
| Handle<JSFunction> bindee_function(JSFunction::cast(*bindee)); |
| Debug::FloodWithOneShot(bindee_function); |
| } |
| } |
| |
| |
| void Debug::FloodHandlerWithOneShot() { |
| // Iterate through the JavaScript stack looking for handlers. |
| StackFrame::Id id = break_frame_id(); |
| if (id == StackFrame::NO_ID) { |
| // If there is no JavaScript stack don't do anything. |
| return; |
| } |
| for (JavaScriptFrameIterator it(isolate_, id); !it.done(); it.Advance()) { |
| JavaScriptFrame* frame = it.frame(); |
| if (frame->HasHandler()) { |
| // Flood the function with the catch block with break points |
| FloodWithOneShot(Handle<JSFunction>(frame->function())); |
| return; |
| } |
| } |
| } |
| |
| |
| void Debug::ChangeBreakOnException(ExceptionBreakType type, bool enable) { |
| if (type == BreakUncaughtException) { |
| break_on_uncaught_exception_ = enable; |
| } else { |
| break_on_exception_ = enable; |
| } |
| } |
| |
| |
| bool Debug::IsBreakOnException(ExceptionBreakType type) { |
| if (type == BreakUncaughtException) { |
| return break_on_uncaught_exception_; |
| } else { |
| return break_on_exception_; |
| } |
| } |
| |
| |
| bool Debug::PromiseHasRejectHandler(Handle<JSObject> promise) { |
| Handle<JSFunction> fun = Handle<JSFunction>::cast( |
| JSObject::GetDataProperty(isolate_->js_builtins_object(), |
| isolate_->factory()->NewStringFromStaticChars( |
| "PromiseHasRejectHandler"))); |
| Handle<Object> result = |
| Execution::Call(isolate_, fun, promise, 0, NULL).ToHandleChecked(); |
| return result->IsTrue(); |
| } |
| |
| |
| void Debug::PrepareStep(StepAction step_action, |
| int step_count, |
| StackFrame::Id frame_id) { |
| HandleScope scope(isolate_); |
| |
| PrepareForBreakPoints(); |
| |
| DCHECK(in_debug_scope()); |
| |
| // Remember this step action and count. |
| thread_local_.last_step_action_ = step_action; |
| if (step_action == StepOut) { |
| // For step out target frame will be found on the stack so there is no need |
| // to set step counter for it. It's expected to always be 0 for StepOut. |
| thread_local_.step_count_ = 0; |
| } else { |
| thread_local_.step_count_ = step_count; |
| } |
| |
| // Get the frame where the execution has stopped and skip the debug frame if |
| // any. The debug frame will only be present if execution was stopped due to |
| // hitting a break point. In other situations (e.g. unhandled exception) the |
| // debug frame is not present. |
| StackFrame::Id id = break_frame_id(); |
| if (id == StackFrame::NO_ID) { |
| // If there is no JavaScript stack don't do anything. |
| return; |
| } |
| if (frame_id != StackFrame::NO_ID) { |
| id = frame_id; |
| } |
| JavaScriptFrameIterator frames_it(isolate_, id); |
| JavaScriptFrame* frame = frames_it.frame(); |
| |
| // First of all ensure there is one-shot break points in the top handler |
| // if any. |
| FloodHandlerWithOneShot(); |
| |
| // If the function on the top frame is unresolved perform step out. This will |
| // be the case when calling unknown functions and having the debugger stopped |
| // in an unhandled exception. |
| if (!frame->function()->IsJSFunction()) { |
| // Step out: Find the calling JavaScript frame and flood it with |
| // breakpoints. |
| frames_it.Advance(); |
| // Fill the function to return to with one-shot break points. |
| JSFunction* function = frames_it.frame()->function(); |
| FloodWithOneShot(Handle<JSFunction>(function)); |
| return; |
| } |
| |
| // Get the debug info (create it if it does not exist). |
| Handle<JSFunction> function(frame->function()); |
| Handle<SharedFunctionInfo> shared(function->shared()); |
| if (!EnsureDebugInfo(shared, function)) { |
| // Return if ensuring debug info failed. |
| return; |
| } |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| |
| // Find the break location where execution has stopped. |
| BreakLocationIterator it(debug_info, ALL_BREAK_LOCATIONS); |
| // pc points to the instruction after the current one, possibly a break |
| // location as well. So the "- 1" to exclude it from the search. |
| it.FindBreakLocationFromAddress(frame->pc() - 1); |
| |
| // Compute whether or not the target is a call target. |
| bool is_load_or_store = false; |
| bool is_inline_cache_stub = false; |
| bool is_at_restarted_function = false; |
| Handle<Code> call_function_stub; |
| |
| if (thread_local_.restarter_frame_function_pointer_ == NULL) { |
| if (RelocInfo::IsCodeTarget(it.rinfo()->rmode())) { |
| bool is_call_target = false; |
| Address target = it.rinfo()->target_address(); |
| Code* code = Code::GetCodeFromTargetAddress(target); |
| if (code->is_call_stub()) { |
| is_call_target = true; |
| } |
| if (code->is_inline_cache_stub()) { |
| is_inline_cache_stub = true; |
| is_load_or_store = !is_call_target; |
| } |
| |
| // Check if target code is CallFunction stub. |
| Code* maybe_call_function_stub = code; |
| // If there is a breakpoint at this line look at the original code to |
| // check if it is a CallFunction stub. |
| if (it.IsDebugBreak()) { |
| Address original_target = it.original_rinfo()->target_address(); |
| maybe_call_function_stub = |
| Code::GetCodeFromTargetAddress(original_target); |
| } |
| if ((maybe_call_function_stub->kind() == Code::STUB && |
| CodeStub::GetMajorKey(maybe_call_function_stub) == |
| CodeStub::CallFunction) || |
| maybe_call_function_stub->kind() == Code::CALL_IC) { |
| // Save reference to the code as we may need it to find out arguments |
| // count for 'step in' later. |
| call_function_stub = Handle<Code>(maybe_call_function_stub); |
| } |
| } |
| } else { |
| is_at_restarted_function = true; |
| } |
| |
| // If this is the last break code target step out is the only possibility. |
| if (it.IsExit() || step_action == StepOut) { |
| if (step_action == StepOut) { |
| // Skip step_count frames starting with the current one. |
| while (step_count-- > 0 && !frames_it.done()) { |
| frames_it.Advance(); |
| } |
| } else { |
| DCHECK(it.IsExit()); |
| frames_it.Advance(); |
| } |
| // Skip builtin functions on the stack. |
| while (!frames_it.done() && |
| frames_it.frame()->function()->IsFromNativeScript()) { |
| frames_it.Advance(); |
| } |
| // Step out: If there is a JavaScript caller frame, we need to |
| // flood it with breakpoints. |
| if (!frames_it.done()) { |
| // Fill the function to return to with one-shot break points. |
| JSFunction* function = frames_it.frame()->function(); |
| FloodWithOneShot(Handle<JSFunction>(function)); |
| // Set target frame pointer. |
| ActivateStepOut(frames_it.frame()); |
| } |
| } else if (!(is_inline_cache_stub || RelocInfo::IsConstructCall(it.rmode()) || |
| !call_function_stub.is_null() || is_at_restarted_function) |
| || step_action == StepNext || step_action == StepMin) { |
| // Step next or step min. |
| |
| // Fill the current function with one-shot break points. |
| FloodWithOneShot(function); |
| |
| // Remember source position and frame to handle step next. |
| thread_local_.last_statement_position_ = |
| debug_info->code()->SourceStatementPosition(frame->pc()); |
| thread_local_.last_fp_ = frame->UnpaddedFP(); |
| } else { |
| // If there's restarter frame on top of the stack, just get the pointer |
| // to function which is going to be restarted. |
| if (is_at_restarted_function) { |
| Handle<JSFunction> restarted_function( |
| JSFunction::cast(*thread_local_.restarter_frame_function_pointer_)); |
| FloodWithOneShot(restarted_function); |
| } else if (!call_function_stub.is_null()) { |
| // If it's CallFunction stub ensure target function is compiled and flood |
| // it with one shot breakpoints. |
| bool is_call_ic = call_function_stub->kind() == Code::CALL_IC; |
| |
| // Find out number of arguments from the stub minor key. |
| uint32_t key = call_function_stub->stub_key(); |
| // Argc in the stub is the number of arguments passed - not the |
| // expected arguments of the called function. |
| int call_function_arg_count = is_call_ic |
| ? CallICStub::ExtractArgcFromMinorKey(CodeStub::MinorKeyFromKey(key)) |
| : CallFunctionStub::ExtractArgcFromMinorKey( |
| CodeStub::MinorKeyFromKey(key)); |
| |
| DCHECK(is_call_ic || |
| CodeStub::GetMajorKey(*call_function_stub) == |
| CodeStub::MajorKeyFromKey(key)); |
| |
| // Find target function on the expression stack. |
| // Expression stack looks like this (top to bottom): |
| // argN |
| // ... |
| // arg0 |
| // Receiver |
| // Function to call |
| int expressions_count = frame->ComputeExpressionsCount(); |
| DCHECK(expressions_count - 2 - call_function_arg_count >= 0); |
| Object* fun = frame->GetExpression( |
| expressions_count - 2 - call_function_arg_count); |
| |
| // Flood the actual target of call/apply. |
| if (fun->IsJSFunction()) { |
| Isolate* isolate = JSFunction::cast(fun)->GetIsolate(); |
| Code* apply = isolate->builtins()->builtin(Builtins::kFunctionApply); |
| Code* call = isolate->builtins()->builtin(Builtins::kFunctionCall); |
| while (fun->IsJSFunction()) { |
| Code* code = JSFunction::cast(fun)->shared()->code(); |
| if (code != apply && code != call) break; |
| fun = frame->GetExpression( |
| expressions_count - 1 - call_function_arg_count); |
| } |
| } |
| |
| if (fun->IsJSFunction()) { |
| Handle<JSFunction> js_function(JSFunction::cast(fun)); |
| if (js_function->shared()->bound()) { |
| Debug::FloodBoundFunctionWithOneShot(js_function); |
| } else if (!js_function->IsFromNativeScript()) { |
| // Don't step into builtins. |
| // It will also compile target function if it's not compiled yet. |
| FloodWithOneShot(js_function); |
| } |
| } |
| } |
| |
| // Fill the current function with one-shot break points even for step in on |
| // a call target as the function called might be a native function for |
| // which step in will not stop. It also prepares for stepping in |
| // getters/setters. |
| FloodWithOneShot(function); |
| |
| if (is_load_or_store) { |
| // Remember source position and frame to handle step in getter/setter. If |
| // there is a custom getter/setter it will be handled in |
| // Object::Get/SetPropertyWithAccessor, otherwise the step action will be |
| // propagated on the next Debug::Break. |
| thread_local_.last_statement_position_ = |
| debug_info->code()->SourceStatementPosition(frame->pc()); |
| thread_local_.last_fp_ = frame->UnpaddedFP(); |
| } |
| |
| // Step in or Step in min |
| it.PrepareStepIn(isolate_); |
| ActivateStepIn(frame); |
| } |
| } |
| |
| |
| // Check whether the current debug break should be reported to the debugger. It |
| // is used to have step next and step in only report break back to the debugger |
| // if on a different frame or in a different statement. In some situations |
| // there will be several break points in the same statement when the code is |
| // flooded with one-shot break points. This function helps to perform several |
| // steps before reporting break back to the debugger. |
| bool Debug::StepNextContinue(BreakLocationIterator* break_location_iterator, |
| JavaScriptFrame* frame) { |
| // StepNext and StepOut shouldn't bring us deeper in code, so last frame |
| // shouldn't be a parent of current frame. |
| if (thread_local_.last_step_action_ == StepNext || |
| thread_local_.last_step_action_ == StepOut) { |
| if (frame->fp() < thread_local_.last_fp_) return true; |
| } |
| |
| // If the step last action was step next or step in make sure that a new |
| // statement is hit. |
| if (thread_local_.last_step_action_ == StepNext || |
| thread_local_.last_step_action_ == StepIn) { |
| // Never continue if returning from function. |
| if (break_location_iterator->IsExit()) return false; |
| |
| // Continue if we are still on the same frame and in the same statement. |
| int current_statement_position = |
| break_location_iterator->code()->SourceStatementPosition(frame->pc()); |
| return thread_local_.last_fp_ == frame->UnpaddedFP() && |
| thread_local_.last_statement_position_ == current_statement_position; |
| } |
| |
| // No step next action - don't continue. |
| return false; |
| } |
| |
| |
| // Check whether the code object at the specified address is a debug break code |
| // object. |
| bool Debug::IsDebugBreak(Address addr) { |
| Code* code = Code::GetCodeFromTargetAddress(addr); |
| return code->is_debug_stub() && code->extra_ic_state() == DEBUG_BREAK; |
| } |
| |
| |
| |
| |
| |
| // Simple function for returning the source positions for active break points. |
| Handle<Object> Debug::GetSourceBreakLocations( |
| Handle<SharedFunctionInfo> shared, |
| BreakPositionAlignment position_alignment) { |
| Isolate* isolate = shared->GetIsolate(); |
| Heap* heap = isolate->heap(); |
| if (!HasDebugInfo(shared)) { |
| return Handle<Object>(heap->undefined_value(), isolate); |
| } |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| if (debug_info->GetBreakPointCount() == 0) { |
| return Handle<Object>(heap->undefined_value(), isolate); |
| } |
| Handle<FixedArray> locations = |
| isolate->factory()->NewFixedArray(debug_info->GetBreakPointCount()); |
| int count = 0; |
| for (int i = 0; i < debug_info->break_points()->length(); i++) { |
| if (!debug_info->break_points()->get(i)->IsUndefined()) { |
| BreakPointInfo* break_point_info = |
| BreakPointInfo::cast(debug_info->break_points()->get(i)); |
| if (break_point_info->GetBreakPointCount() > 0) { |
| Smi* position; |
| switch (position_alignment) { |
| case STATEMENT_ALIGNED: |
| position = break_point_info->statement_position(); |
| break; |
| case BREAK_POSITION_ALIGNED: |
| position = break_point_info->source_position(); |
| break; |
| default: |
| UNREACHABLE(); |
| position = break_point_info->statement_position(); |
| } |
| |
| locations->set(count++, position); |
| } |
| } |
| } |
| return locations; |
| } |
| |
| |
| // Handle stepping into a function. |
| void Debug::HandleStepIn(Handle<JSFunction> function, |
| Handle<Object> holder, |
| Address fp, |
| bool is_constructor) { |
| Isolate* isolate = function->GetIsolate(); |
| // If the frame pointer is not supplied by the caller find it. |
| if (fp == 0) { |
| StackFrameIterator it(isolate); |
| it.Advance(); |
| // For constructor functions skip another frame. |
| if (is_constructor) { |
| DCHECK(it.frame()->is_construct()); |
| it.Advance(); |
| } |
| fp = it.frame()->fp(); |
| } |
| |
| // Flood the function with one-shot break points if it is called from where |
| // step into was requested. |
| if (fp == thread_local_.step_into_fp_) { |
| if (function->shared()->bound()) { |
| // Handle Function.prototype.bind |
| Debug::FloodBoundFunctionWithOneShot(function); |
| } else if (!function->IsFromNativeScript()) { |
| // Don't allow step into functions in the native context. |
| if (function->shared()->code() == |
| isolate->builtins()->builtin(Builtins::kFunctionApply) || |
| function->shared()->code() == |
| isolate->builtins()->builtin(Builtins::kFunctionCall)) { |
| // Handle function.apply and function.call separately to flood the |
| // function to be called and not the code for Builtins::FunctionApply or |
| // Builtins::FunctionCall. The receiver of call/apply is the target |
| // function. |
| if (!holder.is_null() && holder->IsJSFunction()) { |
| Handle<JSFunction> js_function = Handle<JSFunction>::cast(holder); |
| if (!js_function->IsFromNativeScript()) { |
| Debug::FloodWithOneShot(js_function); |
| } else if (js_function->shared()->bound()) { |
| // Handle Function.prototype.bind |
| Debug::FloodBoundFunctionWithOneShot(js_function); |
| } |
| } |
| } else { |
| Debug::FloodWithOneShot(function); |
| } |
| } |
| } |
| } |
| |
| |
| void Debug::ClearStepping() { |
| // Clear the various stepping setup. |
| ClearOneShot(); |
| ClearStepIn(); |
| ClearStepOut(); |
| ClearStepNext(); |
| |
| // Clear multiple step counter. |
| thread_local_.step_count_ = 0; |
| } |
| |
| |
| // Clears all the one-shot break points that are currently set. Normally this |
| // function is called each time a break point is hit as one shot break points |
| // are used to support stepping. |
| void Debug::ClearOneShot() { |
| // The current implementation just runs through all the breakpoints. When the |
| // last break point for a function is removed that function is automatically |
| // removed from the list. |
| |
| DebugInfoListNode* node = debug_info_list_; |
| while (node != NULL) { |
| BreakLocationIterator it(node->debug_info(), ALL_BREAK_LOCATIONS); |
| while (!it.Done()) { |
| it.ClearOneShot(); |
| it.Next(); |
| } |
| node = node->next(); |
| } |
| } |
| |
| |
| void Debug::ActivateStepIn(StackFrame* frame) { |
| DCHECK(!StepOutActive()); |
| thread_local_.step_into_fp_ = frame->UnpaddedFP(); |
| } |
| |
| |
| void Debug::ClearStepIn() { |
| thread_local_.step_into_fp_ = 0; |
| } |
| |
| |
| void Debug::ActivateStepOut(StackFrame* frame) { |
| DCHECK(!StepInActive()); |
| thread_local_.step_out_fp_ = frame->UnpaddedFP(); |
| } |
| |
| |
| void Debug::ClearStepOut() { |
| thread_local_.step_out_fp_ = 0; |
| } |
| |
| |
| void Debug::ClearStepNext() { |
| thread_local_.last_step_action_ = StepNone; |
| thread_local_.last_statement_position_ = RelocInfo::kNoPosition; |
| thread_local_.last_fp_ = 0; |
| } |
| |
| |
| static void CollectActiveFunctionsFromThread( |
| Isolate* isolate, |
| ThreadLocalTop* top, |
| List<Handle<JSFunction> >* active_functions, |
| Object* active_code_marker) { |
| // Find all non-optimized code functions with activation frames |
| // on the stack. This includes functions which have optimized |
| // activations (including inlined functions) on the stack as the |
| // non-optimized code is needed for the lazy deoptimization. |
| for (JavaScriptFrameIterator it(isolate, top); !it.done(); it.Advance()) { |
| JavaScriptFrame* frame = it.frame(); |
| if (frame->is_optimized()) { |
| List<JSFunction*> functions(FLAG_max_inlining_levels + 1); |
| frame->GetFunctions(&functions); |
| for (int i = 0; i < functions.length(); i++) { |
| JSFunction* function = functions[i]; |
| active_functions->Add(Handle<JSFunction>(function)); |
| function->shared()->code()->set_gc_metadata(active_code_marker); |
| } |
| } else if (frame->function()->IsJSFunction()) { |
| JSFunction* function = frame->function(); |
| DCHECK(frame->LookupCode()->kind() == Code::FUNCTION); |
| active_functions->Add(Handle<JSFunction>(function)); |
| function->shared()->code()->set_gc_metadata(active_code_marker); |
| } |
| } |
| } |
| |
| |
| // Figure out how many bytes of "pc_offset" correspond to actual code by |
| // subtracting off the bytes that correspond to constant/veneer pools. See |
| // Assembler::CheckConstPool() and Assembler::CheckVeneerPool(). Note that this |
| // is only useful for architectures using constant pools or veneer pools. |
| static int ComputeCodeOffsetFromPcOffset(Code *code, int pc_offset) { |
| DCHECK_EQ(code->kind(), Code::FUNCTION); |
| DCHECK(!code->has_debug_break_slots()); |
| DCHECK_LE(0, pc_offset); |
| DCHECK_LT(pc_offset, code->instruction_end() - code->instruction_start()); |
| |
| int mask = RelocInfo::ModeMask(RelocInfo::CONST_POOL) | |
| RelocInfo::ModeMask(RelocInfo::VENEER_POOL); |
| byte *pc = code->instruction_start() + pc_offset; |
| int code_offset = pc_offset; |
| for (RelocIterator it(code, mask); !it.done(); it.next()) { |
| RelocInfo* info = it.rinfo(); |
| if (info->pc() >= pc) break; |
| DCHECK(RelocInfo::IsConstPool(info->rmode())); |
| code_offset -= static_cast<int>(info->data()); |
| DCHECK_LE(0, code_offset); |
| } |
| |
| return code_offset; |
| } |
| |
| |
| // The inverse of ComputeCodeOffsetFromPcOffset. |
| static int ComputePcOffsetFromCodeOffset(Code *code, int code_offset) { |
| DCHECK_EQ(code->kind(), Code::FUNCTION); |
| |
| int mask = RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT) | |
| RelocInfo::ModeMask(RelocInfo::CONST_POOL) | |
| RelocInfo::ModeMask(RelocInfo::VENEER_POOL); |
| int reloc = 0; |
| for (RelocIterator it(code, mask); !it.done(); it.next()) { |
| RelocInfo* info = it.rinfo(); |
| if (info->pc() - code->instruction_start() - reloc >= code_offset) break; |
| if (RelocInfo::IsDebugBreakSlot(info->rmode())) { |
| reloc += Assembler::kDebugBreakSlotLength; |
| } else { |
| DCHECK(RelocInfo::IsConstPool(info->rmode())); |
| reloc += static_cast<int>(info->data()); |
| } |
| } |
| |
| int pc_offset = code_offset + reloc; |
| |
| DCHECK_LT(code->instruction_start() + pc_offset, code->instruction_end()); |
| |
| return pc_offset; |
| } |
| |
| |
| static void RedirectActivationsToRecompiledCodeOnThread( |
| Isolate* isolate, |
| ThreadLocalTop* top) { |
| for (JavaScriptFrameIterator it(isolate, top); !it.done(); it.Advance()) { |
| JavaScriptFrame* frame = it.frame(); |
| |
| if (frame->is_optimized() || !frame->function()->IsJSFunction()) continue; |
| |
| JSFunction* function = frame->function(); |
| |
| DCHECK(frame->LookupCode()->kind() == Code::FUNCTION); |
| |
| Handle<Code> frame_code(frame->LookupCode()); |
| if (frame_code->has_debug_break_slots()) continue; |
| |
| Handle<Code> new_code(function->shared()->code()); |
| if (new_code->kind() != Code::FUNCTION || |
| !new_code->has_debug_break_slots()) { |
| continue; |
| } |
| |
| int old_pc_offset = |
| static_cast<int>(frame->pc() - frame_code->instruction_start()); |
| int code_offset = ComputeCodeOffsetFromPcOffset(*frame_code, old_pc_offset); |
| int new_pc_offset = ComputePcOffsetFromCodeOffset(*new_code, code_offset); |
| |
| // Compute the equivalent pc in the new code. |
| byte* new_pc = new_code->instruction_start() + new_pc_offset; |
| |
| if (FLAG_trace_deopt) { |
| PrintF("Replacing code %08" V8PRIxPTR " - %08" V8PRIxPTR " (%d) " |
| "with %08" V8PRIxPTR " - %08" V8PRIxPTR " (%d) " |
| "for debugging, " |
| "changing pc from %08" V8PRIxPTR " to %08" V8PRIxPTR "\n", |
| reinterpret_cast<intptr_t>( |
| frame_code->instruction_start()), |
| reinterpret_cast<intptr_t>( |
| frame_code->instruction_start()) + |
| frame_code->instruction_size(), |
| frame_code->instruction_size(), |
| reinterpret_cast<intptr_t>(new_code->instruction_start()), |
| reinterpret_cast<intptr_t>(new_code->instruction_start()) + |
| new_code->instruction_size(), |
| new_code->instruction_size(), |
| reinterpret_cast<intptr_t>(frame->pc()), |
| reinterpret_cast<intptr_t>(new_pc)); |
| } |
| |
| if (FLAG_enable_ool_constant_pool) { |
| // Update constant pool pointer for new code. |
| frame->set_constant_pool(new_code->constant_pool()); |
| } |
| |
| // Patch the return address to return into the code with |
| // debug break slots. |
| frame->set_pc(new_pc); |
| } |
| } |
| |
| |
| class ActiveFunctionsCollector : public ThreadVisitor { |
| public: |
| explicit ActiveFunctionsCollector(List<Handle<JSFunction> >* active_functions, |
| Object* active_code_marker) |
| : active_functions_(active_functions), |
| active_code_marker_(active_code_marker) { } |
| |
| void VisitThread(Isolate* isolate, ThreadLocalTop* top) { |
| CollectActiveFunctionsFromThread(isolate, |
| top, |
| active_functions_, |
| active_code_marker_); |
| } |
| |
| private: |
| List<Handle<JSFunction> >* active_functions_; |
| Object* active_code_marker_; |
| }; |
| |
| |
| class ActiveFunctionsRedirector : public ThreadVisitor { |
| public: |
| void VisitThread(Isolate* isolate, ThreadLocalTop* top) { |
| RedirectActivationsToRecompiledCodeOnThread(isolate, top); |
| } |
| }; |
| |
| |
| static void EnsureFunctionHasDebugBreakSlots(Handle<JSFunction> function) { |
| if (function->code()->kind() == Code::FUNCTION && |
| function->code()->has_debug_break_slots()) { |
| // Nothing to do. Function code already had debug break slots. |
| return; |
| } |
| // Make sure that the shared full code is compiled with debug |
| // break slots. |
| if (!function->shared()->code()->has_debug_break_slots()) { |
| MaybeHandle<Code> code = Compiler::GetDebugCode(function); |
| // Recompilation can fail. In that case leave the code as it was. |
| if (!code.is_null()) function->ReplaceCode(*code.ToHandleChecked()); |
| } else { |
| // Simply use shared code if it has debug break slots. |
| function->ReplaceCode(function->shared()->code()); |
| } |
| } |
| |
| |
| static void RecompileAndRelocateSuspendedGenerators( |
| const List<Handle<JSGeneratorObject> > &generators) { |
| for (int i = 0; i < generators.length(); i++) { |
| Handle<JSFunction> fun(generators[i]->function()); |
| |
| EnsureFunctionHasDebugBreakSlots(fun); |
| |
| int code_offset = generators[i]->continuation(); |
| int pc_offset = ComputePcOffsetFromCodeOffset(fun->code(), code_offset); |
| generators[i]->set_continuation(pc_offset); |
| } |
| } |
| |
| |
| void Debug::PrepareForBreakPoints() { |
| // If preparing for the first break point make sure to deoptimize all |
| // functions as debugging does not work with optimized code. |
| if (!has_break_points_) { |
| if (isolate_->concurrent_recompilation_enabled()) { |
| isolate_->optimizing_compiler_thread()->Flush(); |
| } |
| |
| Deoptimizer::DeoptimizeAll(isolate_); |
| |
| Handle<Code> lazy_compile = isolate_->builtins()->CompileLazy(); |
| |
| // There will be at least one break point when we are done. |
| has_break_points_ = true; |
| |
| // Keep the list of activated functions in a handlified list as it |
| // is used both in GC and non-GC code. |
| List<Handle<JSFunction> > active_functions(100); |
| |
| // A list of all suspended generators. |
| List<Handle<JSGeneratorObject> > suspended_generators; |
| |
| // A list of all generator functions. We need to recompile all functions, |
| // but we don't know until after visiting the whole heap which generator |
| // functions have suspended activations and which do not. As in the case of |
| // functions with activations on the stack, we need to be careful with |
| // generator functions with suspended activations because although they |
| // should be recompiled, recompilation can fail, and we need to avoid |
| // leaving the heap in an inconsistent state. |
| // |
| // We could perhaps avoid this list and instead re-use the GC metadata |
| // links. |
| List<Handle<JSFunction> > generator_functions; |
| |
| { |
| // We are going to iterate heap to find all functions without |
| // debug break slots. |
| Heap* heap = isolate_->heap(); |
| heap->CollectAllGarbage(Heap::kMakeHeapIterableMask, |
| "preparing for breakpoints"); |
| HeapIterator iterator(heap); |
| |
| // Ensure no GC in this scope as we are going to use gc_metadata |
| // field in the Code object to mark active functions. |
| DisallowHeapAllocation no_allocation; |
| |
| Object* active_code_marker = heap->the_hole_value(); |
| |
| CollectActiveFunctionsFromThread(isolate_, |
| isolate_->thread_local_top(), |
| &active_functions, |
| active_code_marker); |
| ActiveFunctionsCollector active_functions_collector(&active_functions, |
| active_code_marker); |
| isolate_->thread_manager()->IterateArchivedThreads( |
| &active_functions_collector); |
| |
| // Scan the heap for all non-optimized functions which have no |
| // debug break slots and are not active or inlined into an active |
| // function and mark them for lazy compilation. |
| HeapObject* obj = NULL; |
| while (((obj = iterator.next()) != NULL)) { |
| if (obj->IsJSFunction()) { |
| JSFunction* function = JSFunction::cast(obj); |
| SharedFunctionInfo* shared = function->shared(); |
| |
| if (!shared->allows_lazy_compilation()) continue; |
| if (!shared->script()->IsScript()) continue; |
| if (function->IsFromNativeScript()) continue; |
| if (shared->code()->gc_metadata() == active_code_marker) continue; |
| |
| if (shared->is_generator()) { |
| generator_functions.Add(Handle<JSFunction>(function, isolate_)); |
| continue; |
| } |
| |
| Code::Kind kind = function->code()->kind(); |
| if (kind == Code::FUNCTION && |
| !function->code()->has_debug_break_slots()) { |
| function->ReplaceCode(*lazy_compile); |
| function->shared()->ReplaceCode(*lazy_compile); |
| } else if (kind == Code::BUILTIN && |
| (function->IsInOptimizationQueue() || |
| function->IsMarkedForOptimization() || |
| function->IsMarkedForConcurrentOptimization())) { |
| // Abort in-flight compilation. |
| Code* shared_code = function->shared()->code(); |
| if (shared_code->kind() == Code::FUNCTION && |
| shared_code->has_debug_break_slots()) { |
| function->ReplaceCode(shared_code); |
| } else { |
| function->ReplaceCode(*lazy_compile); |
| function->shared()->ReplaceCode(*lazy_compile); |
| } |
| } |
| } else if (obj->IsJSGeneratorObject()) { |
| JSGeneratorObject* gen = JSGeneratorObject::cast(obj); |
| if (!gen->is_suspended()) continue; |
| |
| JSFunction* fun = gen->function(); |
| DCHECK_EQ(fun->code()->kind(), Code::FUNCTION); |
| if (fun->code()->has_debug_break_slots()) continue; |
| |
| int pc_offset = gen->continuation(); |
| DCHECK_LT(0, pc_offset); |
| |
| int code_offset = |
| ComputeCodeOffsetFromPcOffset(fun->code(), pc_offset); |
| |
| // This will be fixed after we recompile the functions. |
| gen->set_continuation(code_offset); |
| |
| suspended_generators.Add(Handle<JSGeneratorObject>(gen, isolate_)); |
| } |
| } |
| |
| // Clear gc_metadata field. |
| for (int i = 0; i < active_functions.length(); i++) { |
| Handle<JSFunction> function = active_functions[i]; |
| function->shared()->code()->set_gc_metadata(Smi::FromInt(0)); |
| } |
| } |
| |
| // Recompile generator functions that have suspended activations, and |
| // relocate those activations. |
| RecompileAndRelocateSuspendedGenerators(suspended_generators); |
| |
| // Mark generator functions that didn't have suspended activations for lazy |
| // recompilation. Note that this set does not include any active functions. |
| for (int i = 0; i < generator_functions.length(); i++) { |
| Handle<JSFunction> &function = generator_functions[i]; |
| if (function->code()->kind() != Code::FUNCTION) continue; |
| if (function->code()->has_debug_break_slots()) continue; |
| function->ReplaceCode(*lazy_compile); |
| function->shared()->ReplaceCode(*lazy_compile); |
| } |
| |
| // Now recompile all functions with activation frames and and |
| // patch the return address to run in the new compiled code. It could be |
| // that some active functions were recompiled already by the suspended |
| // generator recompilation pass above; a generator with suspended |
| // activations could also have active activations. That's fine. |
| for (int i = 0; i < active_functions.length(); i++) { |
| Handle<JSFunction> function = active_functions[i]; |
| Handle<SharedFunctionInfo> shared(function->shared()); |
| |
| // If recompilation is not possible just skip it. |
| if (shared->is_toplevel()) continue; |
| if (!shared->allows_lazy_compilation()) continue; |
| if (shared->code()->kind() == Code::BUILTIN) continue; |
| |
| EnsureFunctionHasDebugBreakSlots(function); |
| } |
| |
| RedirectActivationsToRecompiledCodeOnThread(isolate_, |
| isolate_->thread_local_top()); |
| |
| ActiveFunctionsRedirector active_functions_redirector; |
| isolate_->thread_manager()->IterateArchivedThreads( |
| &active_functions_redirector); |
| } |
| } |
| |
| |
| Object* Debug::FindSharedFunctionInfoInScript(Handle<Script> script, |
| int position) { |
| // Iterate the heap looking for SharedFunctionInfo generated from the |
| // script. The inner most SharedFunctionInfo containing the source position |
| // for the requested break point is found. |
| // NOTE: This might require several heap iterations. If the SharedFunctionInfo |
| // which is found is not compiled it is compiled and the heap is iterated |
| // again as the compilation might create inner functions from the newly |
| // compiled function and the actual requested break point might be in one of |
| // these functions. |
| // NOTE: The below fix-point iteration depends on all functions that cannot be |
| // compiled lazily without a context to not be compiled at all. Compilation |
| // will be triggered at points where we do not need a context. |
| bool done = false; |
| // The current candidate for the source position: |
| int target_start_position = RelocInfo::kNoPosition; |
| Handle<JSFunction> target_function; |
| Handle<SharedFunctionInfo> target; |
| Heap* heap = isolate_->heap(); |
| while (!done) { |
| { // Extra scope for iterator. |
| HeapIterator iterator(heap); |
| for (HeapObject* obj = iterator.next(); |
| obj != NULL; obj = iterator.next()) { |
| bool found_next_candidate = false; |
| Handle<JSFunction> function; |
| Handle<SharedFunctionInfo> shared; |
| if (obj->IsJSFunction()) { |
| function = Handle<JSFunction>(JSFunction::cast(obj)); |
| shared = Handle<SharedFunctionInfo>(function->shared()); |
| DCHECK(shared->allows_lazy_compilation() || shared->is_compiled()); |
| found_next_candidate = true; |
| } else if (obj->IsSharedFunctionInfo()) { |
| shared = Handle<SharedFunctionInfo>(SharedFunctionInfo::cast(obj)); |
| // Skip functions that we cannot compile lazily without a context, |
| // which is not available here, because there is no closure. |
| found_next_candidate = shared->is_compiled() || |
| shared->allows_lazy_compilation_without_context(); |
| } |
| if (!found_next_candidate) continue; |
| if (shared->script() == *script) { |
| // If the SharedFunctionInfo found has the requested script data and |
| // contains the source position it is a candidate. |
| int start_position = shared->function_token_position(); |
| if (start_position == RelocInfo::kNoPosition) { |
| start_position = shared->start_position(); |
| } |
| if (start_position <= position && |
| position <= shared->end_position()) { |
| // If there is no candidate or this function is within the current |
| // candidate this is the new candidate. |
| if (target.is_null()) { |
| target_start_position = start_position; |
| target_function = function; |
| target = shared; |
| } else { |
| if (target_start_position == start_position && |
| shared->end_position() == target->end_position()) { |
| // If a top-level function contains only one function |
| // declaration the source for the top-level and the function |
| // is the same. In that case prefer the non top-level function. |
| if (!shared->is_toplevel()) { |
| target_start_position = start_position; |
| target_function = function; |
| target = shared; |
| } |
| } else if (target_start_position <= start_position && |
| shared->end_position() <= target->end_position()) { |
| // This containment check includes equality as a function |
| // inside a top-level function can share either start or end |
| // position with the top-level function. |
| target_start_position = start_position; |
| target_function = function; |
| target = shared; |
| } |
| } |
| } |
| } |
| } // End for loop. |
| } // End no-allocation scope. |
| |
| if (target.is_null()) return heap->undefined_value(); |
| |
| // There will be at least one break point when we are done. |
| has_break_points_ = true; |
| |
| // If the candidate found is compiled we are done. |
| done = target->is_compiled(); |
| if (!done) { |
| // If the candidate is not compiled, compile it to reveal any inner |
| // functions which might contain the requested source position. This |
| // will compile all inner functions that cannot be compiled without a |
| // context, because Compiler::BuildFunctionInfo checks whether the |
| // debugger is active. |
| MaybeHandle<Code> maybe_result = target_function.is_null() |
| ? Compiler::GetUnoptimizedCode(target) |
| : Compiler::GetUnoptimizedCode(target_function); |
| if (maybe_result.is_null()) return isolate_->heap()->undefined_value(); |
| } |
| } // End while loop. |
| |
| return *target; |
| } |
| |
| |
| // Ensures the debug information is present for shared. |
| bool Debug::EnsureDebugInfo(Handle<SharedFunctionInfo> shared, |
| Handle<JSFunction> function) { |
| Isolate* isolate = shared->GetIsolate(); |
| |
| // Return if we already have the debug info for shared. |
| if (HasDebugInfo(shared)) { |
| DCHECK(shared->is_compiled()); |
| return true; |
| } |
| |
| // There will be at least one break point when we are done. |
| has_break_points_ = true; |
| |
| // Ensure function is compiled. Return false if this failed. |
| if (!function.is_null() && |
| !Compiler::EnsureCompiled(function, CLEAR_EXCEPTION)) { |
| return false; |
| } |
| |
| // Create the debug info object. |
| Handle<DebugInfo> debug_info = isolate->factory()->NewDebugInfo(shared); |
| |
| // Add debug info to the list. |
| DebugInfoListNode* node = new DebugInfoListNode(*debug_info); |
| node->set_next(debug_info_list_); |
| debug_info_list_ = node; |
| |
| return true; |
| } |
| |
| |
| void Debug::RemoveDebugInfo(Handle<DebugInfo> debug_info) { |
| DCHECK(debug_info_list_ != NULL); |
| // Run through the debug info objects to find this one and remove it. |
| DebugInfoListNode* prev = NULL; |
| DebugInfoListNode* current = debug_info_list_; |
| while (current != NULL) { |
| if (*current->debug_info() == *debug_info) { |
| // Unlink from list. If prev is NULL we are looking at the first element. |
| if (prev == NULL) { |
| debug_info_list_ = current->next(); |
| } else { |
| prev->set_next(current->next()); |
| } |
| current->debug_info()->shared()->set_debug_info( |
| isolate_->heap()->undefined_value()); |
| delete current; |
| |
| // If there are no more debug info objects there are not more break |
| // points. |
| has_break_points_ = debug_info_list_ != NULL; |
| |
| return; |
| } |
| // Move to next in list. |
| prev = current; |
| current = current->next(); |
| } |
| UNREACHABLE(); |
| } |
| |
| |
| void Debug::SetAfterBreakTarget(JavaScriptFrame* frame) { |
| after_break_target_ = NULL; |
| |
| if (LiveEdit::SetAfterBreakTarget(this)) return; // LiveEdit did the job. |
| |
| HandleScope scope(isolate_); |
| PrepareForBreakPoints(); |
| |
| // Get the executing function in which the debug break occurred. |
| Handle<JSFunction> function(JSFunction::cast(frame->function())); |
| Handle<SharedFunctionInfo> shared(function->shared()); |
| if (!EnsureDebugInfo(shared, function)) { |
| // Return if we failed to retrieve the debug info. |
| return; |
| } |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| Handle<Code> code(debug_info->code()); |
| Handle<Code> original_code(debug_info->original_code()); |
| #ifdef DEBUG |
| // Get the code which is actually executing. |
| Handle<Code> frame_code(frame->LookupCode()); |
| DCHECK(frame_code.is_identical_to(code)); |
| #endif |
| |
| // Find the call address in the running code. This address holds the call to |
| // either a DebugBreakXXX or to the debug break return entry code if the |
| // break point is still active after processing the break point. |
| Address addr = Assembler::break_address_from_return_address(frame->pc()); |
| |
| // Check if the location is at JS exit or debug break slot. |
| bool at_js_return = false; |
| bool break_at_js_return_active = false; |
| bool at_debug_break_slot = false; |
| RelocIterator it(debug_info->code()); |
| while (!it.done() && !at_js_return && !at_debug_break_slot) { |
| if (RelocInfo::IsJSReturn(it.rinfo()->rmode())) { |
| at_js_return = (it.rinfo()->pc() == |
| addr - Assembler::kPatchReturnSequenceAddressOffset); |
| break_at_js_return_active = it.rinfo()->IsPatchedReturnSequence(); |
| } |
| if (RelocInfo::IsDebugBreakSlot(it.rinfo()->rmode())) { |
| at_debug_break_slot = (it.rinfo()->pc() == |
| addr - Assembler::kPatchDebugBreakSlotAddressOffset); |
| } |
| it.next(); |
| } |
| |
| // Handle the jump to continue execution after break point depending on the |
| // break location. |
| if (at_js_return) { |
| // If the break point as return is still active jump to the corresponding |
| // place in the original code. If not the break point was removed during |
| // break point processing. |
| if (break_at_js_return_active) { |
| addr += original_code->instruction_start() - code->instruction_start(); |
| } |
| |
| // Move back to where the call instruction sequence started. |
| after_break_target_ = addr - Assembler::kPatchReturnSequenceAddressOffset; |
| } else if (at_debug_break_slot) { |
| // Address of where the debug break slot starts. |
| addr = addr - Assembler::kPatchDebugBreakSlotAddressOffset; |
| |
| // Continue just after the slot. |
| after_break_target_ = addr + Assembler::kDebugBreakSlotLength; |
| } else { |
| addr = Assembler::target_address_from_return_address(frame->pc()); |
| if (IsDebugBreak(Assembler::target_address_at(addr, *code))) { |
| // We now know that there is still a debug break call at the target |
| // address, so the break point is still there and the original code will |
| // hold the address to jump to in order to complete the call which is |
| // replaced by a call to DebugBreakXXX. |
| |
| // Find the corresponding address in the original code. |
| addr += original_code->instruction_start() - code->instruction_start(); |
| |
| // Install jump to the call address in the original code. This will be the |
| // call which was overwritten by the call to DebugBreakXXX. |
| after_break_target_ = Assembler::target_address_at(addr, *original_code); |
| } else { |
| // There is no longer a break point present. Don't try to look in the |
| // original code as the running code will have the right address. This |
| // takes care of the case where the last break point is removed from the |
| // function and therefore no "original code" is available. |
| after_break_target_ = Assembler::target_address_at(addr, *code); |
| } |
| } |
| } |
| |
| |
| bool Debug::IsBreakAtReturn(JavaScriptFrame* frame) { |
| HandleScope scope(isolate_); |
| |
| // If there are no break points this cannot be break at return, as |
| // the debugger statement and stack guard bebug break cannot be at |
| // return. |
| if (!has_break_points_) { |
| return false; |
| } |
| |
| PrepareForBreakPoints(); |
| |
| // Get the executing function in which the debug break occurred. |
| Handle<JSFunction> function(JSFunction::cast(frame->function())); |
| Handle<SharedFunctionInfo> shared(function->shared()); |
| if (!EnsureDebugInfo(shared, function)) { |
| // Return if we failed to retrieve the debug info. |
| return false; |
| } |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| Handle<Code> code(debug_info->code()); |
| #ifdef DEBUG |
| // Get the code which is actually executing. |
| Handle<Code> frame_code(frame->LookupCode()); |
| DCHECK(frame_code.is_identical_to(code)); |
| #endif |
| |
| // Find the call address in the running code. |
| Address addr = Assembler::break_address_from_return_address(frame->pc()); |
| |
| // Check if the location is at JS return. |
| RelocIterator it(debug_info->code()); |
| while (!it.done()) { |
| if (RelocInfo::IsJSReturn(it.rinfo()->rmode())) { |
| return (it.rinfo()->pc() == |
| addr - Assembler::kPatchReturnSequenceAddressOffset); |
| } |
| it.next(); |
| } |
| return false; |
| } |
| |
| |
| void Debug::FramesHaveBeenDropped(StackFrame::Id new_break_frame_id, |
| LiveEdit::FrameDropMode mode, |
| Object** restarter_frame_function_pointer) { |
| if (mode != LiveEdit::CURRENTLY_SET_MODE) { |
| thread_local_.frame_drop_mode_ = mode; |
| } |
| thread_local_.break_frame_id_ = new_break_frame_id; |
| thread_local_.restarter_frame_function_pointer_ = |
| restarter_frame_function_pointer; |
| } |
| |
| |
| bool Debug::IsDebugGlobal(GlobalObject* global) { |
| return is_loaded() && global == debug_context()->global_object(); |
| } |
| |
| |
| void Debug::ClearMirrorCache() { |
| PostponeInterruptsScope postpone(isolate_); |
| HandleScope scope(isolate_); |
| AssertDebugContext(); |
| Factory* factory = isolate_->factory(); |
| Handle<GlobalObject> global(isolate_->global_object()); |
| JSObject::SetProperty(global, |
| factory->NewStringFromAsciiChecked("next_handle_"), |
| handle(Smi::FromInt(0), isolate_), SLOPPY).Check(); |
| JSObject::SetProperty(global, |
| factory->NewStringFromAsciiChecked("mirror_cache_"), |
| factory->NewJSArray(0, FAST_ELEMENTS), SLOPPY).Check(); |
| } |
| |
| |
| Handle<FixedArray> Debug::GetLoadedScripts() { |
| // Create and fill the script cache when the loaded scripts is requested for |
| // the first time. |
| if (script_cache_ == NULL) script_cache_ = new ScriptCache(isolate_); |
| |
| // Perform GC to get unreferenced scripts evicted from the cache before |
| // returning the content. |
| isolate_->heap()->CollectAllGarbage(Heap::kNoGCFlags, |
| "Debug::GetLoadedScripts"); |
| |
| // Get the scripts from the cache. |
| return script_cache_->GetScripts(); |
| } |
| |
| |
| void Debug::RecordEvalCaller(Handle<Script> script) { |
| script->set_compilation_type(Script::COMPILATION_TYPE_EVAL); |
| // For eval scripts add information on the function from which eval was |
| // called. |
| StackTraceFrameIterator it(script->GetIsolate()); |
| if (!it.done()) { |
| script->set_eval_from_shared(it.frame()->function()->shared()); |
| Code* code = it.frame()->LookupCode(); |
| int offset = static_cast<int>( |
| it.frame()->pc() - code->instruction_start()); |
| script->set_eval_from_instructions_offset(Smi::FromInt(offset)); |
| } |
| } |
| |
| |
| MaybeHandle<Object> Debug::MakeJSObject(const char* constructor_name, |
| int argc, |
| Handle<Object> argv[]) { |
| AssertDebugContext(); |
| // Create the execution state object. |
| Handle<GlobalObject> global(isolate_->global_object()); |
| Handle<Object> constructor = Object::GetProperty( |
| isolate_, global, constructor_name).ToHandleChecked(); |
| DCHECK(constructor->IsJSFunction()); |
| if (!constructor->IsJSFunction()) return MaybeHandle<Object>(); |
| // We do not handle interrupts here. In particular, termination interrupts. |
| PostponeInterruptsScope no_interrupts(isolate_); |
| return Execution::TryCall(Handle<JSFunction>::cast(constructor), |
| handle(debug_context()->global_proxy()), |
| argc, |
| argv); |
| } |
| |
| |
| MaybeHandle<Object> Debug::MakeExecutionState() { |
| // Create the execution state object. |
| Handle<Object> argv[] = { isolate_->factory()->NewNumberFromInt(break_id()) }; |
| return MakeJSObject("MakeExecutionState", arraysize(argv), argv); |
| } |
| |
| |
| MaybeHandle<Object> Debug::MakeBreakEvent(Handle<Object> break_points_hit) { |
| // Create the new break event object. |
| Handle<Object> argv[] = { isolate_->factory()->NewNumberFromInt(break_id()), |
| break_points_hit }; |
| return MakeJSObject("MakeBreakEvent", arraysize(argv), argv); |
| } |
| |
| |
| MaybeHandle<Object> Debug::MakeExceptionEvent(Handle<Object> exception, |
| bool uncaught, |
| Handle<Object> promise) { |
| // Create the new exception event object. |
| Handle<Object> argv[] = { isolate_->factory()->NewNumberFromInt(break_id()), |
| exception, |
| isolate_->factory()->ToBoolean(uncaught), |
| promise }; |
| return MakeJSObject("MakeExceptionEvent", arraysize(argv), argv); |
| } |
| |
| |
| MaybeHandle<Object> Debug::MakeCompileEvent(Handle<Script> script, |
| v8::DebugEvent type) { |
| // Create the compile event object. |
| Handle<Object> script_wrapper = Script::GetWrapper(script); |
| Handle<Object> argv[] = { script_wrapper, |
| isolate_->factory()->NewNumberFromInt(type) }; |
| return MakeJSObject("MakeCompileEvent", arraysize(argv), argv); |
| } |
| |
| |
| MaybeHandle<Object> Debug::MakePromiseEvent(Handle<JSObject> event_data) { |
| // Create the promise event object. |
| Handle<Object> argv[] = { event_data }; |
| return MakeJSObject("MakePromiseEvent", arraysize(argv), argv); |
| } |
| |
| |
| MaybeHandle<Object> Debug::MakeAsyncTaskEvent(Handle<JSObject> task_event) { |
| // Create the async task event object. |
| Handle<Object> argv[] = { task_event }; |
| return MakeJSObject("MakeAsyncTaskEvent", arraysize(argv), argv); |
| } |
| |
| |
| void Debug::OnThrow(Handle<Object> exception, bool uncaught) { |
| if (in_debug_scope() || ignore_events()) return; |
| // Temporarily clear any scheduled_exception to allow evaluating |
| // JavaScript from the debug event handler. |
| HandleScope scope(isolate_); |
| Handle<Object> scheduled_exception; |
| if (isolate_->has_scheduled_exception()) { |
| scheduled_exception = handle(isolate_->scheduled_exception(), isolate_); |
| isolate_->clear_scheduled_exception(); |
| } |
| OnException(exception, uncaught, isolate_->GetPromiseOnStackOnThrow()); |
| if (!scheduled_exception.is_null()) { |
| isolate_->thread_local_top()->scheduled_exception_ = *scheduled_exception; |
| } |
| } |
| |
| |
| void Debug::OnPromiseReject(Handle<JSObject> promise, Handle<Object> value) { |
| if (in_debug_scope() || ignore_events()) return; |
| HandleScope scope(isolate_); |
| OnException(value, false, promise); |
| } |
| |
| |
| void Debug::OnException(Handle<Object> exception, bool uncaught, |
| Handle<Object> promise) { |
| if (promise->IsJSObject()) { |
| uncaught |= !PromiseHasRejectHandler(Handle<JSObject>::cast(promise)); |
| } |
| // Bail out if exception breaks are not active |
| if (uncaught) { |
| // Uncaught exceptions are reported by either flags. |
| if (!(break_on_uncaught_exception_ || break_on_exception_)) return; |
| } else { |
| // Caught exceptions are reported is activated. |
| if (!break_on_exception_) return; |
| } |
| |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return; |
| |
| // Clear all current stepping setup. |
| ClearStepping(); |
| |
| // Create the event data object. |
| Handle<Object> event_data; |
| // Bail out and don't call debugger if exception. |
| if (!MakeExceptionEvent( |
| exception, uncaught, promise).ToHandle(&event_data)) { |
| return; |
| } |
| |
| // Process debug event. |
| ProcessDebugEvent(v8::Exception, Handle<JSObject>::cast(event_data), false); |
| // Return to continue execution from where the exception was thrown. |
| } |
| |
| |
| void Debug::OnCompileError(Handle<Script> script) { |
| // No more to do if not debugging. |
| if (in_debug_scope() || ignore_events()) return; |
| |
| HandleScope scope(isolate_); |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return; |
| |
| // Create the compile state object. |
| Handle<Object> event_data; |
| // Bail out and don't call debugger if exception. |
| if (!MakeCompileEvent(script, v8::CompileError).ToHandle(&event_data)) return; |
| |
| // Process debug event. |
| ProcessDebugEvent(v8::CompileError, Handle<JSObject>::cast(event_data), true); |
| } |
| |
| |
| void Debug::OnDebugBreak(Handle<Object> break_points_hit, |
| bool auto_continue) { |
| // The caller provided for DebugScope. |
| AssertDebugContext(); |
| // Bail out if there is no listener for this event |
| if (ignore_events()) return; |
| |
| HandleScope scope(isolate_); |
| // Create the event data object. |
| Handle<Object> event_data; |
| // Bail out and don't call debugger if exception. |
| if (!MakeBreakEvent(break_points_hit).ToHandle(&event_data)) return; |
| |
| // Process debug event. |
| ProcessDebugEvent(v8::Break, |
| Handle<JSObject>::cast(event_data), |
| auto_continue); |
| } |
| |
| |
| void Debug::OnBeforeCompile(Handle<Script> script) { |
| if (in_debug_scope() || ignore_events()) return; |
| |
| HandleScope scope(isolate_); |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return; |
| |
| // Create the event data object. |
| Handle<Object> event_data; |
| // Bail out and don't call debugger if exception. |
| if (!MakeCompileEvent(script, v8::BeforeCompile).ToHandle(&event_data)) |
| return; |
| |
| // Process debug event. |
| ProcessDebugEvent(v8::BeforeCompile, |
| Handle<JSObject>::cast(event_data), |
| true); |
| } |
| |
| |
| // Handle debugger actions when a new script is compiled. |
| void Debug::OnAfterCompile(Handle<Script> script) { |
| // Add the newly compiled script to the script cache. |
| if (script_cache_ != NULL) script_cache_->Add(script); |
| |
| // No more to do if not debugging. |
| if (in_debug_scope() || ignore_events()) return; |
| |
| HandleScope scope(isolate_); |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return; |
| |
| // If debugging there might be script break points registered for this |
| // script. Make sure that these break points are set. |
| |
| // Get the function UpdateScriptBreakPoints (defined in debug-debugger.js). |
| Handle<String> update_script_break_points_string = |
| isolate_->factory()->InternalizeOneByteString( |
| STATIC_CHAR_VECTOR("UpdateScriptBreakPoints")); |
| Handle<GlobalObject> debug_global(debug_context()->global_object()); |
| Handle<Object> update_script_break_points = |
| Object::GetProperty( |
| debug_global, update_script_break_points_string).ToHandleChecked(); |
| if (!update_script_break_points->IsJSFunction()) { |
| return; |
| } |
| DCHECK(update_script_break_points->IsJSFunction()); |
| |
| // Wrap the script object in a proper JS object before passing it |
| // to JavaScript. |
| Handle<Object> wrapper = Script::GetWrapper(script); |
| |
| // Call UpdateScriptBreakPoints expect no exceptions. |
| Handle<Object> argv[] = { wrapper }; |
| if (Execution::TryCall(Handle<JSFunction>::cast(update_script_break_points), |
| isolate_->js_builtins_object(), |
| arraysize(argv), |
| argv).is_null()) { |
| return; |
| } |
| |
| // Create the compile state object. |
| Handle<Object> event_data; |
| // Bail out and don't call debugger if exception. |
| if (!MakeCompileEvent(script, v8::AfterCompile).ToHandle(&event_data)) return; |
| |
| // Process debug event. |
| ProcessDebugEvent(v8::AfterCompile, Handle<JSObject>::cast(event_data), true); |
| } |
| |
| |
| void Debug::OnPromiseEvent(Handle<JSObject> data) { |
| if (in_debug_scope() || ignore_events()) return; |
| |
| HandleScope scope(isolate_); |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return; |
| |
| // Create the script collected state object. |
| Handle<Object> event_data; |
| // Bail out and don't call debugger if exception. |
| if (!MakePromiseEvent(data).ToHandle(&event_data)) return; |
| |
| // Process debug event. |
| ProcessDebugEvent(v8::PromiseEvent, |
| Handle<JSObject>::cast(event_data), |
| true); |
| } |
| |
| |
| void Debug::OnAsyncTaskEvent(Handle<JSObject> data) { |
| if (in_debug_scope() || ignore_events()) return; |
| |
| HandleScope scope(isolate_); |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return; |
| |
| // Create the script collected state object. |
| Handle<Object> event_data; |
| // Bail out and don't call debugger if exception. |
| if (!MakeAsyncTaskEvent(data).ToHandle(&event_data)) return; |
| |
| // Process debug event. |
| ProcessDebugEvent(v8::AsyncTaskEvent, |
| Handle<JSObject>::cast(event_data), |
| true); |
| } |
| |
| |
| void Debug::ProcessDebugEvent(v8::DebugEvent event, |
| Handle<JSObject> event_data, |
| bool auto_continue) { |
| HandleScope scope(isolate_); |
| |
| // Create the execution state. |
| Handle<Object> exec_state; |
| // Bail out and don't call debugger if exception. |
| if (!MakeExecutionState().ToHandle(&exec_state)) return; |
| |
| // First notify the message handler if any. |
| if (message_handler_ != NULL) { |
| NotifyMessageHandler(event, |
| Handle<JSObject>::cast(exec_state), |
| event_data, |
| auto_continue); |
| } |
| // Notify registered debug event listener. This can be either a C or |
| // a JavaScript function. Don't call event listener for v8::Break |
| // here, if it's only a debug command -- they will be processed later. |
| if ((event != v8::Break || !auto_continue) && !event_listener_.is_null()) { |
| CallEventCallback(event, exec_state, event_data, NULL); |
| } |
| // Process pending debug commands. |
| if (event == v8::Break) { |
| while (!event_command_queue_.IsEmpty()) { |
| CommandMessage command = event_command_queue_.Get(); |
| if (!event_listener_.is_null()) { |
| CallEventCallback(v8::BreakForCommand, |
| exec_state, |
| event_data, |
| command.client_data()); |
| } |
| command.Dispose(); |
| } |
| } |
| } |
| |
| |
| void Debug::CallEventCallback(v8::DebugEvent event, |
| Handle<Object> exec_state, |
| Handle<Object> event_data, |
| v8::Debug::ClientData* client_data) { |
| if (event_listener_->IsForeign()) { |
| // Invoke the C debug event listener. |
| v8::Debug::EventCallback callback = |
| FUNCTION_CAST<v8::Debug::EventCallback>( |
| Handle<Foreign>::cast(event_listener_)->foreign_address()); |
| EventDetailsImpl event_details(event, |
| Handle<JSObject>::cast(exec_state), |
| Handle<JSObject>::cast(event_data), |
| event_listener_data_, |
| client_data); |
| callback(event_details); |
| DCHECK(!isolate_->has_scheduled_exception()); |
| } else { |
| // Invoke the JavaScript debug event listener. |
| DCHECK(event_listener_->IsJSFunction()); |
| Handle<Object> argv[] = { Handle<Object>(Smi::FromInt(event), isolate_), |
| exec_state, |
| event_data, |
| event_listener_data_ }; |
| Handle<JSReceiver> global(isolate_->global_proxy()); |
| Execution::TryCall(Handle<JSFunction>::cast(event_listener_), |
| global, arraysize(argv), argv); |
| } |
| } |
| |
| |
| Handle<Context> Debug::GetDebugContext() { |
| DebugScope debug_scope(this); |
| // The global handle may be destroyed soon after. Return it reboxed. |
| return handle(*debug_context(), isolate_); |
| } |
| |
| |
| void Debug::NotifyMessageHandler(v8::DebugEvent event, |
| Handle<JSObject> exec_state, |
| Handle<JSObject> event_data, |
| bool auto_continue) { |
| // Prevent other interrupts from triggering, for example API callbacks, |
| // while dispatching message handler callbacks. |
| PostponeInterruptsScope no_interrupts(isolate_); |
| DCHECK(is_active_); |
| HandleScope scope(isolate_); |
| // Process the individual events. |
| bool sendEventMessage = false; |
| switch (event) { |
| case v8::Break: |
| case v8::BreakForCommand: |
| sendEventMessage = !auto_continue; |
| break; |
| case v8::Exception: |
| sendEventMessage = true; |
| break; |
| case v8::BeforeCompile: |
| break; |
| case v8::AfterCompile: |
| sendEventMessage = true; |
| break; |
| case v8::NewFunction: |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| |
| // The debug command interrupt flag might have been set when the command was |
| // added. It should be enough to clear the flag only once while we are in the |
| // debugger. |
| DCHECK(in_debug_scope()); |
| isolate_->stack_guard()->ClearDebugCommand(); |
| |
| // Notify the debugger that a debug event has occurred unless auto continue is |
| // active in which case no event is send. |
| if (sendEventMessage) { |
| MessageImpl message = MessageImpl::NewEvent( |
| event, |
| auto_continue, |
| Handle<JSObject>::cast(exec_state), |
| Handle<JSObject>::cast(event_data)); |
| InvokeMessageHandler(message); |
| } |
| |
| // If auto continue don't make the event cause a break, but process messages |
| // in the queue if any. For script collected events don't even process |
| // messages in the queue as the execution state might not be what is expected |
| // by the client. |
| if (auto_continue && !has_commands()) return; |
| |
| // DebugCommandProcessor goes here. |
| bool running = auto_continue; |
| |
| Handle<Object> cmd_processor_ctor = Object::GetProperty( |
| isolate_, exec_state, "debugCommandProcessor").ToHandleChecked(); |
| Handle<Object> ctor_args[] = { isolate_->factory()->ToBoolean(running) }; |
| Handle<Object> cmd_processor = Execution::Call( |
| isolate_, cmd_processor_ctor, exec_state, 1, ctor_args).ToHandleChecked(); |
| Handle<JSFunction> process_debug_request = Handle<JSFunction>::cast( |
| Object::GetProperty( |
| isolate_, cmd_processor, "processDebugRequest").ToHandleChecked()); |
| Handle<Object> is_running = Object::GetProperty( |
| isolate_, cmd_processor, "isRunning").ToHandleChecked(); |
| |
| // Process requests from the debugger. |
| do { |
| // Wait for new command in the queue. |
| command_received_.Wait(); |
| |
| // Get the command from the queue. |
| CommandMessage command = command_queue_.Get(); |
| isolate_->logger()->DebugTag( |
| "Got request from command queue, in interactive loop."); |
| if (!is_active()) { |
| // Delete command text and user data. |
| command.Dispose(); |
| return; |
| } |
| |
| Vector<const uc16> command_text( |
| const_cast<const uc16*>(command.text().start()), |
| command.text().length()); |
| Handle<String> request_text = isolate_->factory()->NewStringFromTwoByte( |
| command_text).ToHandleChecked(); |
| Handle<Object> request_args[] = { request_text }; |
| Handle<Object> answer_value; |
| Handle<String> answer; |
| MaybeHandle<Object> maybe_exception; |
| MaybeHandle<Object> maybe_result = |
| Execution::TryCall(process_debug_request, cmd_processor, 1, |
| request_args, &maybe_exception); |
| |
| if (maybe_result.ToHandle(&answer_value)) { |
| if (answer_value->IsUndefined()) { |
| answer = isolate_->factory()->empty_string(); |
| } else { |
| answer = Handle<String>::cast(answer_value); |
| } |
| |
| // Log the JSON request/response. |
| if (FLAG_trace_debug_json) { |
| PrintF("%s\n", request_text->ToCString().get()); |
| PrintF("%s\n", answer->ToCString().get()); |
| } |
| |
| Handle<Object> is_running_args[] = { answer }; |
| maybe_result = Execution::Call( |
| isolate_, is_running, cmd_processor, 1, is_running_args); |
| Handle<Object> result; |
| if (!maybe_result.ToHandle(&result)) break; |
| running = result->IsTrue(); |
| } else { |
| Handle<Object> exception; |
| if (!maybe_exception.ToHandle(&exception)) break; |
| Handle<Object> result; |
| if (!Execution::ToString(isolate_, exception).ToHandle(&result)) break; |
| answer = Handle<String>::cast(result); |
| } |
| |
| // Return the result. |
| MessageImpl message = MessageImpl::NewResponse( |
| event, running, exec_state, event_data, answer, command.client_data()); |
| InvokeMessageHandler(message); |
| command.Dispose(); |
| |
| // Return from debug event processing if either the VM is put into the |
| // running state (through a continue command) or auto continue is active |
| // and there are no more commands queued. |
| } while (!running || has_commands()); |
| command_queue_.Clear(); |
| } |
| |
| |
| void Debug::SetEventListener(Handle<Object> callback, |
| Handle<Object> data) { |
| GlobalHandles* global_handles = isolate_->global_handles(); |
| |
| // Remove existing entry. |
| GlobalHandles::Destroy(event_listener_.location()); |
| event_listener_ = Handle<Object>(); |
| GlobalHandles::Destroy(event_listener_data_.location()); |
| event_listener_data_ = Handle<Object>(); |
| |
| // Set new entry. |
| if (!callback->IsUndefined() && !callback->IsNull()) { |
| event_listener_ = global_handles->Create(*callback); |
| if (data.is_null()) data = isolate_->factory()->undefined_value(); |
| event_listener_data_ = global_handles->Create(*data); |
| } |
| |
| UpdateState(); |
| } |
| |
| |
| void Debug::SetMessageHandler(v8::Debug::MessageHandler handler) { |
| message_handler_ = handler; |
| UpdateState(); |
| if (handler == NULL && in_debug_scope()) { |
| // Send an empty command to the debugger if in a break to make JavaScript |
| // run again if the debugger is closed. |
| EnqueueCommandMessage(Vector<const uint16_t>::empty()); |
| } |
| } |
| |
| |
| |
| void Debug::UpdateState() { |
| is_active_ = message_handler_ != NULL || !event_listener_.is_null(); |
| if (is_active_ || in_debug_scope()) { |
| // Note that the debug context could have already been loaded to |
| // bootstrap test cases. |
| isolate_->compilation_cache()->Disable(); |
| is_active_ = Load(); |
| } else if (is_loaded()) { |
| isolate_->compilation_cache()->Enable(); |
| Unload(); |
| } |
| } |
| |
| |
| // Calls the registered debug message handler. This callback is part of the |
| // public API. |
| void Debug::InvokeMessageHandler(MessageImpl message) { |
| if (message_handler_ != NULL) message_handler_(message); |
| } |
| |
| |
| // Puts a command coming from the public API on the queue. Creates |
| // a copy of the command string managed by the debugger. Up to this |
| // point, the command data was managed by the API client. Called |
| // by the API client thread. |
| void Debug::EnqueueCommandMessage(Vector<const uint16_t> command, |
| v8::Debug::ClientData* client_data) { |
| // Need to cast away const. |
| CommandMessage message = CommandMessage::New( |
| Vector<uint16_t>(const_cast<uint16_t*>(command.start()), |
| command.length()), |
| client_data); |
| isolate_->logger()->DebugTag("Put command on command_queue."); |
| command_queue_.Put(message); |
| command_received_.Signal(); |
| |
| // Set the debug command break flag to have the command processed. |
| if (!in_debug_scope()) isolate_->stack_guard()->RequestDebugCommand(); |
| } |
| |
| |
| void Debug::EnqueueDebugCommand(v8::Debug::ClientData* client_data) { |
| CommandMessage message = CommandMessage::New(Vector<uint16_t>(), client_data); |
| event_command_queue_.Put(message); |
| |
| // Set the debug command break flag to have the command processed. |
| if (!in_debug_scope()) isolate_->stack_guard()->RequestDebugCommand(); |
| } |
| |
| |
| MaybeHandle<Object> Debug::Call(Handle<JSFunction> fun, Handle<Object> data) { |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return isolate_->factory()->undefined_value(); |
| |
| // Create the execution state. |
| Handle<Object> exec_state; |
| if (!MakeExecutionState().ToHandle(&exec_state)) { |
| return isolate_->factory()->undefined_value(); |
| } |
| |
| Handle<Object> argv[] = { exec_state, data }; |
| return Execution::Call( |
| isolate_, |
| fun, |
| Handle<Object>(debug_context()->global_proxy(), isolate_), |
| arraysize(argv), |
| argv); |
| } |
| |
| |
| void Debug::HandleDebugBreak() { |
| // Ignore debug break during bootstrapping. |
| if (isolate_->bootstrapper()->IsActive()) return; |
| // Just continue if breaks are disabled. |
| if (break_disabled_) return; |
| // Ignore debug break if debugger is not active. |
| if (!is_active()) return; |
| |
| StackLimitCheck check(isolate_); |
| if (check.HasOverflowed()) return; |
| |
| { JavaScriptFrameIterator it(isolate_); |
| DCHECK(!it.done()); |
| Object* fun = it.frame()->function(); |
| if (fun && fun->IsJSFunction()) { |
| // Don't stop in builtin functions. |
| if (JSFunction::cast(fun)->IsBuiltin()) return; |
| GlobalObject* global = JSFunction::cast(fun)->context()->global_object(); |
| // Don't stop in debugger functions. |
| if (IsDebugGlobal(global)) return; |
| } |
| } |
| |
| // Collect the break state before clearing the flags. |
| bool debug_command_only = isolate_->stack_guard()->CheckDebugCommand() && |
| !isolate_->stack_guard()->CheckDebugBreak(); |
| |
| isolate_->stack_guard()->ClearDebugBreak(); |
| |
| ProcessDebugMessages(debug_command_only); |
| } |
| |
| |
| void Debug::ProcessDebugMessages(bool debug_command_only) { |
| isolate_->stack_guard()->ClearDebugCommand(); |
| |
| StackLimitCheck check(isolate_); |
| if (check.HasOverflowed()) return; |
| |
| HandleScope scope(isolate_); |
| DebugScope debug_scope(this); |
| if (debug_scope.failed()) return; |
| |
| // Notify the debug event listeners. Indicate auto continue if the break was |
| // a debug command break. |
| OnDebugBreak(isolate_->factory()->undefined_value(), debug_command_only); |
| } |
| |
| |
| DebugScope::DebugScope(Debug* debug) |
| : debug_(debug), |
| prev_(debug->debugger_entry()), |
| save_(debug_->isolate_), |
| no_termination_exceptons_(debug_->isolate_, |
| StackGuard::TERMINATE_EXECUTION) { |
| // Link recursive debugger entry. |
| debug_->thread_local_.current_debug_scope_ = this; |
| |
| // Store the previous break id and frame id. |
| break_id_ = debug_->break_id(); |
| break_frame_id_ = debug_->break_frame_id(); |
| |
| // Create the new break info. If there is no JavaScript frames there is no |
| // break frame id. |
| JavaScriptFrameIterator it(isolate()); |
| bool has_js_frames = !it.done(); |
| debug_->thread_local_.break_frame_id_ = has_js_frames ? it.frame()->id() |
| : StackFrame::NO_ID; |
| debug_->SetNextBreakId(); |
| |
| debug_->UpdateState(); |
| // Make sure that debugger is loaded and enter the debugger context. |
| // The previous context is kept in save_. |
| failed_ = !debug_->is_loaded(); |
| if (!failed_) isolate()->set_context(*debug->debug_context()); |
| } |
| |
| |
| |
| DebugScope::~DebugScope() { |
| if (!failed_ && prev_ == NULL) { |
| // Clear mirror cache when leaving the debugger. Skip this if there is a |
| // pending exception as clearing the mirror cache calls back into |
| // JavaScript. This can happen if the v8::Debug::Call is used in which |
| // case the exception should end up in the calling code. |
| if (!isolate()->has_pending_exception()) debug_->ClearMirrorCache(); |
| |
| // If there are commands in the queue when leaving the debugger request |
| // that these commands are processed. |
| if (debug_->has_commands()) isolate()->stack_guard()->RequestDebugCommand(); |
| } |
| |
| // Leaving this debugger entry. |
| debug_->thread_local_.current_debug_scope_ = prev_; |
| |
| // Restore to the previous break state. |
| debug_->thread_local_.break_frame_id_ = break_frame_id_; |
| debug_->thread_local_.break_id_ = break_id_; |
| |
| debug_->UpdateState(); |
| } |
| |
| |
| MessageImpl MessageImpl::NewEvent(DebugEvent event, |
| bool running, |
| Handle<JSObject> exec_state, |
| Handle<JSObject> event_data) { |
| MessageImpl message(true, event, running, |
| exec_state, event_data, Handle<String>(), NULL); |
| return message; |
| } |
| |
| |
| MessageImpl MessageImpl::NewResponse(DebugEvent event, |
| bool running, |
| Handle<JSObject> exec_state, |
| Handle<JSObject> event_data, |
| Handle<String> response_json, |
| v8::Debug::ClientData* client_data) { |
| MessageImpl message(false, event, running, |
| exec_state, event_data, response_json, client_data); |
| return message; |
| } |
| |
| |
| MessageImpl::MessageImpl(bool is_event, |
| DebugEvent event, |
| bool running, |
| Handle<JSObject> exec_state, |
| Handle<JSObject> event_data, |
| Handle<String> response_json, |
| v8::Debug::ClientData* client_data) |
| : is_event_(is_event), |
| event_(event), |
| running_(running), |
| exec_state_(exec_state), |
| event_data_(event_data), |
| response_json_(response_json), |
| client_data_(client_data) {} |
| |
| |
| bool MessageImpl::IsEvent() const { |
| return is_event_; |
| } |
| |
| |
| bool MessageImpl::IsResponse() const { |
| return !is_event_; |
| } |
| |
| |
| DebugEvent MessageImpl::GetEvent() const { |
| return event_; |
| } |
| |
| |
| bool MessageImpl::WillStartRunning() const { |
| return running_; |
| } |
| |
| |
| v8::Handle<v8::Object> MessageImpl::GetExecutionState() const { |
| return v8::Utils::ToLocal(exec_state_); |
| } |
| |
| |
| v8::Isolate* MessageImpl::GetIsolate() const { |
| return reinterpret_cast<v8::Isolate*>(exec_state_->GetIsolate()); |
| } |
| |
| |
| v8::Handle<v8::Object> MessageImpl::GetEventData() const { |
| return v8::Utils::ToLocal(event_data_); |
| } |
| |
| |
| v8::Handle<v8::String> MessageImpl::GetJSON() const { |
| Isolate* isolate = event_data_->GetIsolate(); |
| v8::EscapableHandleScope scope(reinterpret_cast<v8::Isolate*>(isolate)); |
| |
| if (IsEvent()) { |
| // Call toJSONProtocol on the debug event object. |
| Handle<Object> fun = Object::GetProperty( |
| isolate, event_data_, "toJSONProtocol").ToHandleChecked(); |
| if (!fun->IsJSFunction()) { |
| return v8::Handle<v8::String>(); |
| } |
| |
| MaybeHandle<Object> maybe_json = |
| Execution::TryCall(Handle<JSFunction>::cast(fun), event_data_, 0, NULL); |
| Handle<Object> json; |
| if (!maybe_json.ToHandle(&json) || !json->IsString()) { |
| return v8::Handle<v8::String>(); |
| } |
| return scope.Escape(v8::Utils::ToLocal(Handle<String>::cast(json))); |
| } else { |
| return v8::Utils::ToLocal(response_json_); |
| } |
| } |
| |
| |
| v8::Handle<v8::Context> MessageImpl::GetEventContext() const { |
| Isolate* isolate = event_data_->GetIsolate(); |
| v8::Handle<v8::Context> context = GetDebugEventContext(isolate); |
| // Isolate::context() may be NULL when "script collected" event occures. |
| DCHECK(!context.IsEmpty()); |
| return context; |
| } |
| |
| |
| v8::Debug::ClientData* MessageImpl::GetClientData() const { |
| return client_data_; |
| } |
| |
| |
| EventDetailsImpl::EventDetailsImpl(DebugEvent event, |
| Handle<JSObject> exec_state, |
| Handle<JSObject> event_data, |
| Handle<Object> callback_data, |
| v8::Debug::ClientData* client_data) |
| : event_(event), |
| exec_state_(exec_state), |
| event_data_(event_data), |
| callback_data_(callback_data), |
| client_data_(client_data) {} |
| |
| |
| DebugEvent EventDetailsImpl::GetEvent() const { |
| return event_; |
| } |
| |
| |
| v8::Handle<v8::Object> EventDetailsImpl::GetExecutionState() const { |
| return v8::Utils::ToLocal(exec_state_); |
| } |
| |
| |
| v8::Handle<v8::Object> EventDetailsImpl::GetEventData() const { |
| return v8::Utils::ToLocal(event_data_); |
| } |
| |
| |
| v8::Handle<v8::Context> EventDetailsImpl::GetEventContext() const { |
| return GetDebugEventContext(exec_state_->GetIsolate()); |
| } |
| |
| |
| v8::Handle<v8::Value> EventDetailsImpl::GetCallbackData() const { |
| return v8::Utils::ToLocal(callback_data_); |
| } |
| |
| |
| v8::Debug::ClientData* EventDetailsImpl::GetClientData() const { |
| return client_data_; |
| } |
| |
| |
| CommandMessage::CommandMessage() : text_(Vector<uint16_t>::empty()), |
| client_data_(NULL) { |
| } |
| |
| |
| CommandMessage::CommandMessage(const Vector<uint16_t>& text, |
| v8::Debug::ClientData* data) |
| : text_(text), |
| client_data_(data) { |
| } |
| |
| |
| void CommandMessage::Dispose() { |
| text_.Dispose(); |
| delete client_data_; |
| client_data_ = NULL; |
| } |
| |
| |
| CommandMessage CommandMessage::New(const Vector<uint16_t>& command, |
| v8::Debug::ClientData* data) { |
| return CommandMessage(command.Clone(), data); |
| } |
| |
| |
| CommandMessageQueue::CommandMessageQueue(int size) : start_(0), end_(0), |
| size_(size) { |
| messages_ = NewArray<CommandMessage>(size); |
| } |
| |
| |
| CommandMessageQueue::~CommandMessageQueue() { |
| while (!IsEmpty()) Get().Dispose(); |
| DeleteArray(messages_); |
| } |
| |
| |
| CommandMessage CommandMessageQueue::Get() { |
| DCHECK(!IsEmpty()); |
| int result = start_; |
| start_ = (start_ + 1) % size_; |
| return messages_[result]; |
| } |
| |
| |
| void CommandMessageQueue::Put(const CommandMessage& message) { |
| if ((end_ + 1) % size_ == start_) { |
| Expand(); |
| } |
| messages_[end_] = message; |
| end_ = (end_ + 1) % size_; |
| } |
| |
| |
| void CommandMessageQueue::Expand() { |
| CommandMessageQueue new_queue(size_ * 2); |
| while (!IsEmpty()) { |
| new_queue.Put(Get()); |
| } |
| CommandMessage* array_to_free = messages_; |
| *this = new_queue; |
| new_queue.messages_ = array_to_free; |
| // Make the new_queue empty so that it doesn't call Dispose on any messages. |
| new_queue.start_ = new_queue.end_; |
| // Automatic destructor called on new_queue, freeing array_to_free. |
| } |
| |
| |
| LockingCommandMessageQueue::LockingCommandMessageQueue(Logger* logger, int size) |
| : logger_(logger), queue_(size) {} |
| |
| |
| bool LockingCommandMessageQueue::IsEmpty() const { |
| base::LockGuard<base::Mutex> lock_guard(&mutex_); |
| return queue_.IsEmpty(); |
| } |
| |
| |
| CommandMessage LockingCommandMessageQueue::Get() { |
| base::LockGuard<base::Mutex> lock_guard(&mutex_); |
| CommandMessage result = queue_.Get(); |
| logger_->DebugEvent("Get", result.text()); |
| return result; |
| } |
| |
| |
| void LockingCommandMessageQueue::Put(const CommandMessage& message) { |
| base::LockGuard<base::Mutex> lock_guard(&mutex_); |
| queue_.Put(message); |
| logger_->DebugEvent("Put", message.text()); |
| } |
| |
| |
| void LockingCommandMessageQueue::Clear() { |
| base::LockGuard<base::Mutex> lock_guard(&mutex_); |
| queue_.Clear(); |
| } |
| |
| } } // namespace v8::internal |