| // Copyright 2006-2008 Google Inc. All Rights Reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "api.h" |
| #include "arguments.h" |
| #include "bootstrapper.h" |
| #include "code-stubs.h" |
| #include "compiler.h" |
| #include "debug.h" |
| #include "execution.h" |
| #include "global-handles.h" |
| #include "natives.h" |
| #include "stub-cache.h" |
| #include "log.h" |
| |
| namespace v8 { namespace internal { |
| |
| DEFINE_bool(remote_debugging, false, "enable remote debugging"); |
| DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response"); |
| DECLARE_bool(allow_natives_syntax); |
| DECLARE_bool(log_debugger); |
| |
| |
| static void PrintLn(v8::Local<v8::Value> value) { |
| v8::Local<v8::String> s = value->ToString(); |
| char* data = NewArray<char>(s->Length() + 1); |
| if (data == NULL) { |
| V8::FatalProcessOutOfMemory("PrintLn"); |
| return; |
| } |
| s->WriteAscii(data); |
| PrintF("%s\n", data); |
| DeleteArray(data); |
| } |
| |
| |
| static Handle<Code> ComputeCallDebugBreak(int argc) { |
| CALL_HEAP_FUNCTION(StubCache::ComputeCallDebugBreak(argc), Code); |
| } |
| |
| |
| static Handle<Code> ComputeCallDebugPrepareStepIn(int argc) { |
| CALL_HEAP_FUNCTION(StubCache::ComputeCallDebugPrepareStepIn(argc), Code); |
| } |
| |
| |
| 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() { |
| ASSERT(reloc_iterator_ != NULL); |
| ASSERT(reloc_iterator_original_ != NULL); |
| delete reloc_iterator_; |
| delete reloc_iterator_original_; |
| } |
| |
| |
| void BreakLocationIterator::Next() { |
| AssertNoAllocation nogc; |
| ASSERT(!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; |
| |
| // Update the current source position each time a source position is |
| // passed. |
| if (is_position(rmode())) { |
| position_ = rinfo()->data() - debug_info_->shared()->start_position(); |
| if (is_statement_position(rmode())) { |
| statement_position_ = |
| rinfo()->data() - debug_info_->shared()->start_position(); |
| } |
| ASSERT(position_ >= 0); |
| ASSERT(statement_position_ >= 0); |
| } |
| |
| // 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. |
| if (is_code_target(rmode())) { |
| Address target = original_rinfo()->target_address(); |
| Code* code = Debug::GetCodeTarget(target); |
| if (code->is_inline_cache_stub() || is_js_construct_call(rmode())) { |
| break_point_++; |
| return; |
| } |
| if (code->kind() == Code::STUB) { |
| if (type_ == ALL_BREAK_LOCATIONS) { |
| if (Debug::IsBreakStub(code)) { |
| break_point_++; |
| return; |
| } |
| } else { |
| ASSERT(type_ == SOURCE_BREAK_LOCATIONS); |
| if (Debug::IsSourceBreakStub(code)) { |
| break_point_++; |
| return; |
| } |
| } |
| } |
| } |
| |
| // Check for break at return. |
| // Currently is_exit_js_frame is used on ARM. |
| if (is_js_return(rmode()) || is_exit_js_frame(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(); |
| } else { |
| position_ = 0; |
| } |
| statement_position_ = position_; |
| break_point_++; |
| return; |
| } |
| } |
| } |
| |
| |
| void BreakLocationIterator::Next(int count) { |
| while (count > 0) { |
| Next(); |
| count--; |
| } |
| } |
| |
| |
| // Find the break point closest to the supplied 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 = 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) { |
| // Run through all break points to locate the one closest to the source |
| // position. |
| int closest_break_point = 0; |
| int distance = kMaxInt; |
| while (!Done()) { |
| // Check if this break point is closer that what was previously found. |
| if (position <= statement_position() && |
| statement_position() - position < distance) { |
| closest_break_point = break_point(); |
| distance = statement_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()); |
| reloc_iterator_original_ = new RelocIterator(debug_info_->original_code()); |
| |
| // 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(); |
| } |
| ASSERT(IsDebugBreak()); |
| // 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(); |
| ASSERT(!IsDebugBreak()); |
| } |
| } |
| |
| |
| void BreakLocationIterator::SetOneShot() { |
| // If there is a real break point here no more to do. |
| if (HasBreakPoint()) { |
| ASSERT(IsDebugBreak()); |
| return; |
| } |
| |
| // Patch code with debug break. |
| SetDebugBreak(); |
| } |
| |
| |
| void BreakLocationIterator::ClearOneShot() { |
| // If there is a real break point here no more to do. |
| if (HasBreakPoint()) { |
| ASSERT(IsDebugBreak()); |
| return; |
| } |
| |
| // Patch code removing debug break. |
| ClearDebugBreak(); |
| ASSERT(!IsDebugBreak()); |
| } |
| |
| |
| void BreakLocationIterator::SetDebugBreak() { |
| // If there is already a break point here just return. This might happen if |
| // the same code is flodded with break points twice. Flodding 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 (is_js_return(rmode())) { |
| // This path is currently only used on IA32 as JSExitFrame on ARM uses a |
| // stub. |
| // Patch the JS frame exit code with a debug break call. See |
| // VisitReturnStatement and ExitJSFrame in codegen-ia32.cc for the |
| // precise return instructions sequence. |
| ASSERT(Debug::kIa32JSReturnSequenceLength >= |
| Debug::kIa32CallInstructionLength); |
| rinfo()->patch_code_with_call(Debug::debug_break_return_entry()->entry(), |
| Debug::kIa32JSReturnSequenceLength - Debug::kIa32CallInstructionLength); |
| } else { |
| // 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()); |
| |
| // Patch the code to invoke the builtin debug break function matching the |
| // calling convention used by the call site. |
| Handle<Code> dbgbrk_code(Debug::FindDebugBreak(rinfo())); |
| rinfo()->set_target_address(dbgbrk_code->entry()); |
| } |
| ASSERT(IsDebugBreak()); |
| } |
| |
| |
| void BreakLocationIterator::ClearDebugBreak() { |
| if (is_js_return(rmode())) { |
| // Restore the JS frame exit code. |
| rinfo()->patch_code(original_rinfo()->pc(), |
| Debug::kIa32JSReturnSequenceLength); |
| } else { |
| // Patch the code to the original invoke. |
| rinfo()->set_target_address(original_rinfo()->target_address()); |
| } |
| ASSERT(!IsDebugBreak()); |
| } |
| |
| |
| void BreakLocationIterator::PrepareStepIn() { |
| // Step in can only be prepared if currently positioned on an IC call or |
| // construct call. |
| Address target = rinfo()->target_address(); |
| Code* code = Debug::GetCodeTarget(target); |
| if (code->is_call_stub()) { |
| // Step in through IC call is handled by the runtime system. Therefore make |
| // sure that the any current IC is cleared and the runtime system is |
| // called. If the executing code has a debug break at the location change |
| // the call in the original code as it is the code there that will be |
| // executed in place of the debug break call. |
| Handle<Code> stub = ComputeCallDebugPrepareStepIn(code->arguments_count()); |
| if (IsDebugBreak()) { |
| original_rinfo()->set_target_address(stub->entry()); |
| } else { |
| rinfo()->set_target_address(stub->entry()); |
| } |
| } else { |
| // Step in through constructs call requires no changs to the running code. |
| ASSERT(is_js_construct_call(rmode())); |
| } |
| } |
| |
| |
| // Check whether the break point is at a position which will exit the function. |
| bool BreakLocationIterator::IsExit() const { |
| // Currently is_exit_js_frame is used on ARM. |
| return (is_js_return(rmode()) || is_exit_js_frame(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 (is_js_return(rmode())) { |
| // This is IA32 specific but works as long as the ARM version |
| // still uses a stub for JSExitFrame. |
| // |
| // TODO(1240753): Make the test architecture independent or split |
| // parts of the debugger into architecture dependent files. |
| return (*(rinfo()->pc()) == 0xE8); |
| } else { |
| return Debug::IsDebugBreak(rinfo()->target_address()); |
| } |
| } |
| |
| |
| Object* BreakLocationIterator::BreakPointObjects() { |
| return debug_info_->GetBreakPointObjects(code_position()); |
| } |
| |
| |
| bool BreakLocationIterator::RinfoDone() const { |
| ASSERT(reloc_iterator_->done() == reloc_iterator_original_->done()); |
| return reloc_iterator_->done(); |
| } |
| |
| |
| void BreakLocationIterator::RinfoNext() { |
| reloc_iterator_->next(); |
| reloc_iterator_original_->next(); |
| #ifdef DEBUG |
| ASSERT(reloc_iterator_->done() == reloc_iterator_original_->done()); |
| if (!reloc_iterator_->done()) { |
| ASSERT(rmode() == original_rmode()); |
| } |
| #endif |
| } |
| |
| |
| bool Debug::has_break_points_ = false; |
| DebugInfoListNode* Debug::debug_info_list_ = NULL; |
| |
| |
| // Threading support. |
| void Debug::ThreadInit() { |
| thread_local_.last_step_action_ = StepNone; |
| thread_local_.last_statement_position_ = kNoPosition; |
| thread_local_.step_count_ = 0; |
| thread_local_.last_fp_ = 0; |
| thread_local_.step_into_fp_ = 0; |
| thread_local_.after_break_target_ = 0; |
| } |
| |
| |
| JSCallerSavedBuffer Debug::registers_; |
| Debug::ThreadLocal Debug::thread_local_; |
| |
| |
| char* Debug::ArchiveDebug(char* storage) { |
| char* to = storage; |
| memcpy(to, reinterpret_cast<char*>(&thread_local_), sizeof(ThreadLocal)); |
| to += sizeof(ThreadLocal); |
| memcpy(to, reinterpret_cast<char*>(®isters_), sizeof(registers_)); |
| ThreadInit(); |
| ASSERT(to <= storage + ArchiveSpacePerThread()); |
| return storage + ArchiveSpacePerThread(); |
| } |
| |
| |
| char* Debug::RestoreDebug(char* storage) { |
| char* from = storage; |
| memcpy(reinterpret_cast<char*>(&thread_local_), from, sizeof(ThreadLocal)); |
| from += sizeof(ThreadLocal); |
| memcpy(reinterpret_cast<char*>(®isters_), from, sizeof(registers_)); |
| ASSERT(from <= storage + ArchiveSpacePerThread()); |
| return storage + ArchiveSpacePerThread(); |
| } |
| |
| |
| int Debug::ArchiveSpacePerThread() { |
| return sizeof(ThreadLocal) + sizeof(registers_); |
| } |
| |
| |
| // Default break enabled. |
| bool Debug::disable_break_ = false; |
| |
| // Default call debugger on uncaught exception. |
| bool Debug::break_on_exception_ = false; |
| bool Debug::break_on_uncaught_exception_ = true; |
| |
| Handle<Context> Debug::debug_context_ = Handle<Context>(); |
| Code* Debug::debug_break_return_entry_ = NULL; |
| Code* Debug::debug_break_return_ = NULL; |
| |
| |
| void Debug::HandleWeakDebugInfo(v8::Persistent<v8::Object> obj, void* data) { |
| DebugInfoListNode* node = reinterpret_cast<DebugInfoListNode*>(data); |
| RemoveDebugInfo(node->debug_info()); |
| #ifdef DEBUG |
| node = Debug::debug_info_list_; |
| while (node != NULL) { |
| ASSERT(node != reinterpret_cast<DebugInfoListNode*>(data)); |
| node = node->next(); |
| } |
| #endif |
| } |
| |
| |
| DebugInfoListNode::DebugInfoListNode(DebugInfo* debug_info): next_(NULL) { |
| // Globalize the request debug info object and make it weak. |
| debug_info_ = Handle<DebugInfo>::cast((GlobalHandles::Create(debug_info))); |
| GlobalHandles::MakeWeak(reinterpret_cast<Object**>(debug_info_.location()), |
| this, Debug::HandleWeakDebugInfo); |
| } |
| |
| |
| DebugInfoListNode::~DebugInfoListNode() { |
| GlobalHandles::Destroy(reinterpret_cast<Object**>(debug_info_.location())); |
| } |
| |
| |
| void Debug::Setup(bool create_heap_objects) { |
| ThreadInit(); |
| if (create_heap_objects) { |
| // Get code to handle entry to debug break on return. |
| debug_break_return_entry_ = |
| Builtins::builtin(Builtins::Return_DebugBreakEntry); |
| ASSERT(debug_break_return_entry_->IsCode()); |
| |
| // Get code to handle debug break on return. |
| debug_break_return_ = |
| Builtins::builtin(Builtins::Return_DebugBreak); |
| ASSERT(debug_break_return_->IsCode()); |
| } |
| } |
| |
| |
| bool Debug::CompileDebuggerScript(int index) { |
| HandleScope scope; |
| |
| // Bail out if the index is invalid. |
| if (index == -1) { |
| return false; |
| } |
| |
| // Find source and name for the requested script. |
| Handle<String> source_code = Bootstrapper::NativesSourceLookup(index); |
| Vector<const char> name = Natives::GetScriptName(index); |
| Handle<String> script_name = Factory::NewStringFromAscii(name); |
| |
| // Compile the script. |
| bool allow_natives_syntax = FLAG_allow_natives_syntax; |
| FLAG_allow_natives_syntax = true; |
| Handle<JSFunction> boilerplate; |
| boilerplate = Compiler::Compile(source_code, script_name, 0, 0, NULL, NULL); |
| FLAG_allow_natives_syntax = allow_natives_syntax; |
| |
| // Silently ignore stack overflows during compilation. |
| if (boilerplate.is_null()) { |
| ASSERT(Top::has_pending_exception()); |
| Top::clear_pending_exception(); |
| return false; |
| } |
| |
| // Execute the boilerplate function in the debugger context. |
| Handle<Context> context = Top::global_context(); |
| bool caught_exception = false; |
| Handle<JSFunction> function = |
| Factory::NewFunctionFromBoilerplate(boilerplate, context); |
| Handle<Object> result = |
| Execution::TryCall(function, Handle<Object>(context->global()), |
| 0, NULL, &caught_exception); |
| |
| // Check for caught exceptions. |
| if (caught_exception) { |
| MessageHandler::ReportMessage("error_loading_debugger", NULL, |
| HandleVector<Object>(&result, 1)); |
| 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 (IsLoaded()) return true; |
| |
| // Bail out if we're already in the process of compiling the native |
| // JavaScript source code for the debugger. |
| if (Debugger::compiling_natives() || Debugger::is_loading_debugger()) |
| return false; |
| Debugger::set_loading_debugger(true); |
| |
| // Disable breakpoints and interrupts while compiling and running the |
| // debugger scripts including the context creation code. |
| DisableBreak disable(true); |
| PostponeInterruptsScope postpone; |
| |
| // Create the debugger context. |
| HandleScope scope; |
| Handle<Context> context = |
| Bootstrapper::CreateEnvironment(Handle<Object>::null(), |
| v8::Handle<ObjectTemplate>(), |
| NULL); |
| |
| // Use the debugger context. |
| SaveContext save; |
| Top::set_context(*context); |
| Top::set_security_context(*context); |
| |
| // Expose the builtins object in the debugger context. |
| Handle<String> key = Factory::LookupAsciiSymbol("builtins"); |
| Handle<GlobalObject> global = Handle<GlobalObject>(context->global()); |
| SetProperty(global, key, Handle<Object>(global->builtins()), NONE); |
| |
| // Compile the JavaScript for the debugger in the debugger context. |
| Debugger::set_compiling_natives(true); |
| bool caught_exception = |
| !CompileDebuggerScript(Natives::GetIndex("mirror")) || |
| !CompileDebuggerScript(Natives::GetIndex("debug")); |
| Debugger::set_compiling_natives(false); |
| |
| // Make sure we mark the debugger as not loading before we might |
| // return. |
| Debugger::set_loading_debugger(false); |
| |
| // Check for caught exceptions. |
| if (caught_exception) return false; |
| |
| // Debugger loaded. |
| debug_context_ = Handle<Context>::cast(GlobalHandles::Create(*context)); |
| return true; |
| } |
| |
| |
| void Debug::Unload() { |
| // Return debugger is not loaded. |
| if (!IsLoaded()) { |
| return; |
| } |
| |
| // Clear debugger context global handle. |
| GlobalHandles::Destroy(reinterpret_cast<Object**>(debug_context_.location())); |
| debug_context_ = Handle<Context>(); |
| } |
| |
| |
| void Debug::Iterate(ObjectVisitor* v) { |
| #define VISIT(field) v->VisitPointer(reinterpret_cast<Object**>(&(field))); |
| VISIT(debug_break_return_entry_); |
| VISIT(debug_break_return_); |
| #undef VISIT |
| } |
| |
| |
| Object* Debug::Break(Arguments args) { |
| HandleScope scope; |
| ASSERT(args.length() == 0); |
| |
| // Get the top-most JavaScript frame. |
| JavaScriptFrameIterator it; |
| JavaScriptFrame* frame = it.frame(); |
| |
| // Just continue if breaks are disabled or debugger cannot be loaded. |
| if (disable_break() || !Load()) { |
| SetAfterBreakTarget(frame); |
| return Heap::undefined_value(); |
| } |
| |
| SaveBreakFrame save; |
| EnterDebuggerContext enter; |
| |
| // Postpone interrupt during breakpoint processing. |
| PostponeInterruptsScope postpone; |
| |
| // Get the debug info (create it if it does not exist). |
| Handle<SharedFunctionInfo> shared = |
| Handle<SharedFunctionInfo>(JSFunction::cast(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); |
| break_location_iterator.FindBreakLocationFromAddress(frame->pc()); |
| |
| // 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()); |
| if (break_location_iterator.HasBreakPoint()) { |
| Handle<Object> break_point_objects = |
| Handle<Object>(break_location_iterator.BreakPointObjects()); |
| break_points_hit = CheckBreakPoints(break_point_objects); |
| } |
| |
| // Notify debugger if a real break point is triggered or if performing single |
| // stepping with no more steps to perform. Otherwise do another step. |
| if (!break_points_hit->IsUndefined() || |
| (thread_local_.last_step_action_ != StepNone && |
| thread_local_.step_count_ == 0)) { |
| // Clear all current stepping setup. |
| ClearStepping(); |
| |
| // Notify the debug event listeners. |
| Debugger::OnDebugBreak(break_points_hit); |
| } 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_; |
| |
| // Clear all current stepping setup. |
| ClearStepping(); |
| |
| // Set up for the remaining steps. |
| PrepareStep(step_action, step_count); |
| } |
| |
| // Install jump to the call address which was overwritten. |
| SetAfterBreakTarget(frame); |
| |
| return 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) { |
| int break_points_hit_count = 0; |
| Handle<JSArray> break_points_hit = Factory::NewJSArray(1); |
| |
| // If there are multiple break points they are in a Fixedrray. |
| ASSERT(!break_point_objects->IsUndefined()); |
| if (break_point_objects->IsFixedArray()) { |
| Handle<FixedArray> array(FixedArray::cast(*break_point_objects)); |
| for (int i = 0; i < array->length(); i++) { |
| Handle<Object> o(array->get(i)); |
| if (CheckBreakPoint(o)) { |
| break_points_hit->SetElement(break_points_hit_count++, *o); |
| } |
| } |
| } else { |
| if (CheckBreakPoint(break_point_objects)) { |
| break_points_hit->SetElement(break_points_hit_count++, |
| *break_point_objects); |
| } |
| } |
| |
| // Return undefined if no break points where triggered. |
| if (break_points_hit_count == 0) { |
| return Factory::undefined_value(); |
| } |
| return break_points_hit; |
| } |
| |
| |
| // Check whether a single break point object is triggered. |
| bool Debug::CheckBreakPoint(Handle<Object> break_point_object) { |
| // Ignore check if break point object is not a JSObject. |
| if (!break_point_object->IsJSObject()) return true; |
| |
| // Get the function CheckBreakPoint (defined in debug.js). |
| Handle<JSFunction> check_break_point = |
| Handle<JSFunction>(JSFunction::cast( |
| debug_context()->global()->GetProperty( |
| *Factory::LookupAsciiSymbol("IsBreakPointTriggered")))); |
| |
| // Get the break id as an object. |
| Handle<Object> break_id = Factory::NewNumberFromInt(Top::break_id()); |
| |
| // Call HandleBreakPointx. |
| bool caught_exception = false; |
| const int argc = 2; |
| Object** argv[argc] = { |
| break_id.location(), |
| reinterpret_cast<Object**>(break_point_object.location()) |
| }; |
| Handle<Object> result = Execution::TryCall(check_break_point, |
| Top::builtins(), argc, argv, |
| &caught_exception); |
| |
| // If exception or non boolean result handle as not triggered |
| if (caught_exception || !result->IsBoolean()) { |
| return false; |
| } |
| |
| // Return whether the break point is triggered. |
| return *result == Heap::true_value(); |
| } |
| |
| |
| // 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) { |
| ASSERT(HasDebugInfo(shared)); |
| return Handle<DebugInfo>(DebugInfo::cast(shared->debug_info())); |
| } |
| |
| |
| void Debug::SetBreakPoint(Handle<SharedFunctionInfo> shared, |
| int source_position, |
| Handle<Object> break_point_object) { |
| if (!EnsureDebugInfo(shared)) { |
| // Return if retrieving debug info failed. |
| return; |
| } |
| |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| // Source positions starts with zero. |
| ASSERT(source_position >= 0); |
| |
| // Find the break point and change it. |
| BreakLocationIterator it(debug_info, SOURCE_BREAK_LOCATIONS); |
| it.FindBreakLocationFromPosition(source_position); |
| it.SetBreakPoint(break_point_object); |
| |
| // At least one active break point now. |
| ASSERT(debug_info->GetBreakPointCount() > 0); |
| } |
| |
| |
| void Debug::ClearBreakPoint(Handle<Object> break_point_object) { |
| 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(); |
| Handle<SharedFunctionInfo> shared(debug_info->shared()); |
| int source_position = break_point_info->statement_position()->value(); |
| |
| // Source positions starts with zero. |
| ASSERT(source_position >= 0); |
| |
| // Find the break point and clear it. |
| BreakLocationIterator it(debug_info, SOURCE_BREAK_LOCATIONS); |
| it.FindBreakLocationFromPosition(source_position); |
| 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::FloodWithOneShot(Handle<SharedFunctionInfo> shared) { |
| // Make sure the function has setup the debug info. |
| if (!EnsureDebugInfo(shared)) { |
| // 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::FloodHandlerWithOneShot() { |
| StackFrame::Id id = Top::break_frame_id(); |
| for (JavaScriptFrameIterator it(id); !it.done(); it.Advance()) { |
| JavaScriptFrame* frame = it.frame(); |
| if (frame->HasHandler()) { |
| Handle<SharedFunctionInfo> shared = |
| Handle<SharedFunctionInfo>( |
| JSFunction::cast(frame->function())->shared()); |
| // Flood the function with the catch block with break points |
| FloodWithOneShot(shared); |
| return; |
| } |
| } |
| } |
| |
| |
| void Debug::ChangeBreakOnException(ExceptionBreakType type, bool enable) { |
| if (type == BreakUncaughtException) { |
| break_on_uncaught_exception_ = enable; |
| } else { |
| break_on_exception_ = enable; |
| } |
| } |
| |
| |
| void Debug::PrepareStep(StepAction step_action, int step_count) { |
| HandleScope scope; |
| ASSERT(Debug::InDebugger()); |
| |
| // Remember this step action and count. |
| thread_local_.last_step_action_ = step_action; |
| 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 = Top::break_frame_id(); |
| JavaScriptFrameIterator frames_it(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 = JSFunction::cast(frames_it.frame()->function()); |
| FloodWithOneShot(Handle<SharedFunctionInfo>(function->shared())); |
| return; |
| } |
| |
| // Get the debug info (create it if it does not exist). |
| Handle<SharedFunctionInfo> shared = |
| Handle<SharedFunctionInfo>(JSFunction::cast(frame->function())->shared()); |
| if (!EnsureDebugInfo(shared)) { |
| // 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); |
| it.FindBreakLocationFromAddress(frame->pc()); |
| |
| // Compute whether or not the target is a call target. |
| bool is_call_target = false; |
| if (is_code_target(it.rinfo()->rmode())) { |
| Address target = it.rinfo()->target_address(); |
| Code* code = Debug::GetCodeTarget(target); |
| if (code->is_call_stub()) is_call_target = true; |
| } |
| |
| // If this is the last break code target step out is the only posibility. |
| if (it.IsExit() || step_action == StepOut) { |
| // Step out: If there is a JavaScript caller frame, we need to |
| // flood it with breakpoints. |
| frames_it.Advance(); |
| if (!frames_it.done()) { |
| // Fill the function to return to with one-shot break points. |
| JSFunction* function = JSFunction::cast(frames_it.frame()->function()); |
| FloodWithOneShot(Handle<SharedFunctionInfo>(function->shared())); |
| } |
| } else if (!(is_call_target || is_js_construct_call(it.rmode())) || |
| step_action == StepNext || step_action == StepMin) { |
| // Step next or step min. |
| |
| // Fill the current function with one-shot break points. |
| FloodWithOneShot(shared); |
| |
| // 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->fp(); |
| } else { |
| // 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. |
| FloodWithOneShot(shared); |
| |
| // Step in or Step in min |
| it.PrepareStepIn(); |
| 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 |
| // flodded 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) { |
| // 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->fp() && |
| 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 = GetCodeTarget(addr); |
| return code->ic_state() == DEBUG_BREAK; |
| } |
| |
| |
| // Check whether a code stub with the specified major key is a possible break |
| // point location when looking for source break locations. |
| bool Debug::IsSourceBreakStub(Code* code) { |
| CodeStub::Major major_key = code->major_key(); |
| return major_key == CodeStub::CallFunction; |
| } |
| |
| |
| // Check whether a code stub with the specified major key is a possible break |
| // location. |
| bool Debug::IsBreakStub(Code* code) { |
| CodeStub::Major major_key = code->major_key(); |
| return major_key == CodeStub::CallFunction || |
| major_key == CodeStub::StackCheck; |
| } |
| |
| |
| // Find the builtin to use for invoking the debug break |
| Handle<Code> Debug::FindDebugBreak(RelocInfo* rinfo) { |
| // Find the builtin debug break function matching the calling convention |
| // used by the call site. |
| RelocMode mode = rinfo->rmode(); |
| |
| if (is_code_target(mode)) { |
| Address target = rinfo->target_address(); |
| Code* code = Debug::GetCodeTarget(target); |
| if (code->is_inline_cache_stub()) { |
| if (code->is_call_stub()) { |
| return ComputeCallDebugBreak(code->arguments_count()); |
| } |
| if (code->is_load_stub()) { |
| return Handle<Code>(Builtins::builtin(Builtins::LoadIC_DebugBreak)); |
| } |
| if (code->is_store_stub()) { |
| return Handle<Code>(Builtins::builtin(Builtins::StoreIC_DebugBreak)); |
| } |
| if (code->is_keyed_load_stub()) { |
| Handle<Code> result = |
| Handle<Code>(Builtins::builtin(Builtins::KeyedLoadIC_DebugBreak)); |
| return result; |
| } |
| if (code->is_keyed_store_stub()) { |
| Handle<Code> result = |
| Handle<Code>(Builtins::builtin(Builtins::KeyedStoreIC_DebugBreak)); |
| return result; |
| } |
| } |
| if (is_js_construct_call(mode)) { |
| Handle<Code> result = |
| Handle<Code>(Builtins::builtin(Builtins::ConstructCall_DebugBreak)); |
| return result; |
| } |
| // Currently is_exit_js_frame is used on ARM. |
| if (is_exit_js_frame(mode)) { |
| return Handle<Code>(Builtins::builtin(Builtins::Return_DebugBreak)); |
| } |
| if (code->kind() == Code::STUB) { |
| ASSERT(code->major_key() == CodeStub::CallFunction || |
| code->major_key() == CodeStub::StackCheck); |
| Handle<Code> result = |
| Handle<Code>(Builtins::builtin(Builtins::StubNoRegisters_DebugBreak)); |
| return result; |
| } |
| } |
| |
| UNREACHABLE(); |
| return Handle<Code>::null(); |
| } |
| |
| |
| // Simple function for returning the source positions for active break points. |
| Handle<Object> Debug::GetSourceBreakLocations( |
| Handle<SharedFunctionInfo> shared) { |
| if (!HasDebugInfo(shared)) return Handle<Object>(Heap::undefined_value()); |
| Handle<DebugInfo> debug_info = GetDebugInfo(shared); |
| if (debug_info->GetBreakPointCount() == 0) { |
| return Handle<Object>(Heap::undefined_value()); |
| } |
| Handle<FixedArray> locations = |
| 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) { |
| locations->set(count++, break_point_info->statement_position()); |
| } |
| } |
| } |
| return locations; |
| } |
| |
| |
| void Debug::ClearStepping() { |
| // Clear the various stepping setup. |
| ClearOneShot(); |
| ClearStepIn(); |
| 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 automaticaly |
| // 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) { |
| thread_local_.step_into_fp_ = frame->fp(); |
| } |
| |
| |
| void Debug::ClearStepIn() { |
| thread_local_.step_into_fp_ = 0; |
| } |
| |
| |
| void Debug::ClearStepNext() { |
| thread_local_.last_step_action_ = StepNone; |
| thread_local_.last_statement_position_ = kNoPosition; |
| thread_local_.last_fp_ = 0; |
| } |
| |
| |
| bool Debug::EnsureCompiled(Handle<SharedFunctionInfo> shared) { |
| if (shared->is_compiled()) return true; |
| return CompileLazyShared(shared, CLEAR_EXCEPTION); |
| } |
| |
| |
| // Ensures the debug information is present for shared. |
| bool Debug::EnsureDebugInfo(Handle<SharedFunctionInfo> shared) { |
| // Return if we already have the debug info for shared. |
| if (HasDebugInfo(shared)) return true; |
| |
| // Ensure shared in compiled. Return false if this failed. |
| if (!EnsureCompiled(shared)) return false; |
| |
| // Create the debug info object. |
| Handle<DebugInfo> debug_info = |
| Handle<DebugInfo>::cast(Factory::NewStruct(DEBUG_INFO_TYPE)); |
| |
| // Get the function original code. |
| Handle<Code> code(shared->code()); |
| |
| // Debug info contains function, a copy of the original code and the executing |
| // code. |
| debug_info->set_shared(*shared); |
| debug_info->set_original_code(*Factory::CopyCode(code)); |
| debug_info->set_code(*code); |
| |
| // Link debug info to function. |
| shared->set_debug_info(*debug_info); |
| |
| // Initially no active break points. |
| debug_info->set_break_points( |
| *Factory::NewFixedArray(Debug::kEstimatedNofBreakPointsInFunction)); |
| |
| // Add debug info to the list. |
| DebugInfoListNode* node = new DebugInfoListNode(*debug_info); |
| node->set_next(debug_info_list_); |
| debug_info_list_ = node; |
| |
| // Now there is at least one break point. |
| has_break_points_ = true; |
| |
| return true; |
| } |
| |
| |
| void Debug::RemoveDebugInfo(Handle<DebugInfo> debug_info) { |
| ASSERT(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(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) { |
| // Get the executing function in which the debug break occurred. |
| Handle<SharedFunctionInfo> shared = |
| Handle<SharedFunctionInfo>(JSFunction::cast(frame->function())->shared()); |
| if (!EnsureDebugInfo(shared)) { |
| // 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->FindCode()); |
| ASSERT(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 = frame->pc() - Assembler::kTargetAddrToReturnAddrDist; |
| |
| // Check if the location is at JS exit. |
| bool at_js_exit = false; |
| RelocIterator it(debug_info->code()); |
| while (!it.done()) { |
| if (is_js_return(it.rinfo()->rmode())) { |
| at_js_exit = it.rinfo()->pc() == addr - 1; |
| } |
| it.next(); |
| } |
| |
| // Handle the jump to continue execution after break point depending on the |
| // break location. |
| if (at_js_exit) { |
| // First check if the call in the code is still the debug break return |
| // entry code. If it is the break point is still active. If not the break |
| // point was removed during break point processing. |
| if (Assembler::target_address_at(addr) == |
| debug_break_return_entry()->entry()) { |
| // Break point still active. Jump to the corresponding place in the |
| // original code. |
| addr += original_code->instruction_start() - code->instruction_start(); |
| } |
| |
| // Move one byte back to where the call instruction was placed. |
| thread_local_.after_break_target_ = addr - 1; |
| } else { |
| // Check if there still is a debug break call at the target address. If the |
| // break point has been removed it will have disappeared. If it have |
| // disappeared 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. If the debug break call is still there find the address in |
| // the original code. |
| if (IsDebugBreak(Assembler::target_address_at(addr))) { |
| // If the break point is still there find the call address which was |
| // overwritten in the original code by the 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. |
| thread_local_.after_break_target_ = Assembler::target_address_at(addr); |
| } |
| } |
| |
| |
| Code* Debug::GetCodeTarget(Address target) { |
| // Maybe this can be refactored with the stuff in ic-inl.h? |
| Code* result = |
| Code::cast(HeapObject::FromAddress(target - Code::kHeaderSize)); |
| return result; |
| } |
| |
| |
| bool Debug::IsDebugGlobal(GlobalObject* global) { |
| return IsLoaded() && global == Debug::debug_context()->global(); |
| } |
| |
| |
| bool Debugger::debugger_active_ = false; |
| bool Debugger::compiling_natives_ = false; |
| bool Debugger::is_loading_debugger_ = false; |
| DebugMessageThread* Debugger::message_thread_ = NULL; |
| v8::DebugMessageHandler Debugger::debug_message_handler_ = NULL; |
| void* Debugger::debug_message_handler_data_ = NULL; |
| |
| |
| Handle<Object> Debugger::MakeJSObject(Vector<const char> constructor_name, |
| int argc, Object*** argv, |
| bool* caught_exception) { |
| ASSERT(Top::context() == *Debug::debug_context()); |
| |
| // Create the execution state object. |
| Handle<String> constructor_str = Factory::LookupSymbol(constructor_name); |
| Handle<Object> constructor(Top::global()->GetProperty(*constructor_str)); |
| ASSERT(constructor->IsJSFunction()); |
| if (!constructor->IsJSFunction()) { |
| *caught_exception = true; |
| return Factory::undefined_value(); |
| } |
| Handle<Object> js_object = Execution::TryCall( |
| Handle<JSFunction>::cast(constructor), |
| Handle<JSObject>(Debug::debug_context()->global()), argc, argv, |
| caught_exception); |
| return js_object; |
| } |
| |
| |
| Handle<Object> Debugger::MakeExecutionState(bool* caught_exception) { |
| // Create the execution state object. |
| Handle<Object> break_id = Factory::NewNumberFromInt(Top::break_id()); |
| const int argc = 1; |
| Object** argv[argc] = { break_id.location() }; |
| return MakeJSObject(CStrVector("MakeExecutionState"), |
| argc, argv, caught_exception); |
| } |
| |
| |
| Handle<Object> Debugger::MakeBreakEvent(Handle<Object> exec_state, |
| Handle<Object> break_points_hit, |
| bool* caught_exception) { |
| // Create the new break event object. |
| const int argc = 2; |
| Object** argv[argc] = { exec_state.location(), |
| break_points_hit.location() }; |
| return MakeJSObject(CStrVector("MakeBreakEvent"), |
| argc, |
| argv, |
| caught_exception); |
| } |
| |
| |
| Handle<Object> Debugger::MakeExceptionEvent(Handle<Object> exec_state, |
| Handle<Object> exception, |
| bool uncaught, |
| bool* caught_exception) { |
| // Create the new exception event object. |
| const int argc = 3; |
| Object** argv[argc] = { exec_state.location(), |
| exception.location(), |
| uncaught ? Factory::true_value().location() : |
| Factory::false_value().location()}; |
| return MakeJSObject(CStrVector("MakeExceptionEvent"), |
| argc, argv, caught_exception); |
| } |
| |
| |
| Handle<Object> Debugger::MakeNewFunctionEvent(Handle<Object> function, |
| bool* caught_exception) { |
| // Create the new function event object. |
| const int argc = 1; |
| Object** argv[argc] = { function.location() }; |
| return MakeJSObject(CStrVector("MakeNewFunctionEvent"), |
| argc, argv, caught_exception); |
| } |
| |
| |
| Handle<Object> Debugger::MakeCompileEvent(Handle<Script> script, |
| Handle<Object> script_function, |
| bool* caught_exception) { |
| // Create the compile event object. |
| Handle<Object> exec_state = MakeExecutionState(caught_exception); |
| Handle<Object> script_source(script->source()); |
| Handle<Object> script_name(script->name()); |
| const int argc = 3; |
| Object** argv[argc] = { script_source.location(), |
| script_name.location(), |
| script_function.location() }; |
| return MakeJSObject(CStrVector("MakeCompileEvent"), |
| argc, |
| argv, |
| caught_exception); |
| } |
| |
| |
| Handle<String> Debugger::ProcessRequest(Handle<Object> exec_state, |
| Handle<Object> request, |
| bool stopped) { |
| // Get the function ProcessDebugRequest (declared in debug.js). |
| Handle<JSFunction> process_denbug_request = |
| Handle<JSFunction>(JSFunction::cast( |
| Debug::debug_context()->global()->GetProperty( |
| *Factory::LookupAsciiSymbol("ProcessDebugRequest")))); |
| |
| // Call ProcessDebugRequest expect String result. The ProcessDebugRequest |
| // will never throw an exception (see debug.js). |
| bool caught_exception; |
| const int argc = 3; |
| Object** argv[argc] = { exec_state.location(), |
| request.location(), |
| stopped ? Factory::true_value().location() : |
| Factory::false_value().location()}; |
| Handle<Object> result = Execution::TryCall(process_denbug_request, |
| Factory::undefined_value(), |
| argc, argv, |
| &caught_exception); |
| if (caught_exception) { |
| return Factory::empty_symbol(); |
| } |
| |
| return Handle<String>::cast(result); |
| } |
| |
| |
| void Debugger::OnException(Handle<Object> exception, bool uncaught) { |
| HandleScope scope; |
| |
| // Bail out based on state or if there is no listener for this event |
| if (Debug::InDebugger()) return; |
| if (!Debugger::EventActive(v8::Exception)) return; |
| |
| // Bail out if exception breaks are not active |
| if (uncaught) { |
| // Uncaught exceptions are reported by either flags. |
| if (!(Debug::break_on_uncaught_exception() || |
| Debug::break_on_exception())) return; |
| } else { |
| // Caught exceptions are reported is activated. |
| if (!Debug::break_on_exception()) return; |
| } |
| |
| // Enter the debugger. Bail out if the debugger cannot be loaded. |
| if (!Debug::Load()) return; |
| SaveBreakFrame save; |
| EnterDebuggerContext enter; |
| |
| // Clear all current stepping setup. |
| Debug::ClearStepping(); |
| // Create the event data object. |
| bool caught_exception = false; |
| Handle<Object> exec_state = MakeExecutionState(&caught_exception); |
| Handle<Object> event_data; |
| if (!caught_exception) { |
| event_data = MakeExceptionEvent(exec_state, exception, uncaught, |
| &caught_exception); |
| } |
| // Bail out and don't call debugger if exception. |
| if (caught_exception) { |
| return; |
| } |
| |
| // Process debug event |
| ProcessDebugEvent(v8::Exception, event_data); |
| // Return to continue execution from where the exception was thrown. |
| } |
| |
| |
| void Debugger::OnDebugBreak(Handle<Object> break_points_hit) { |
| HandleScope scope; |
| |
| // Debugger has already been entered by caller. |
| ASSERT(Top::context() == *Debug::debug_context()); |
| |
| // Bail out if there is no listener for this event |
| if (!Debugger::EventActive(v8::Break)) return; |
| |
| // Debugger must be entered in advance. |
| ASSERT(Top::context() == *Debug::debug_context()); |
| |
| // Create the event data object. |
| bool caught_exception = false; |
| Handle<Object> exec_state = MakeExecutionState(&caught_exception); |
| Handle<Object> event_data; |
| if (!caught_exception) { |
| event_data = MakeBreakEvent(exec_state, break_points_hit, |
| &caught_exception); |
| } |
| // Bail out and don't call debugger if exception. |
| if (caught_exception) { |
| return; |
| } |
| |
| // Process debug event |
| ProcessDebugEvent(v8::Break, event_data); |
| } |
| |
| |
| void Debugger::OnBeforeCompile(Handle<Script> script) { |
| HandleScope scope; |
| |
| // Bail out based on state or if there is no listener for this event |
| if (Debug::InDebugger()) return; |
| if (compiling_natives()) return; |
| if (!EventActive(v8::BeforeCompile)) return; |
| |
| // Enter the debugger. Bail out if the debugger cannot be loaded. |
| if (!Debug::Load()) return; |
| SaveBreakFrame save; |
| EnterDebuggerContext enter; |
| |
| // Create the event data object. |
| bool caught_exception = false; |
| Handle<Object> event_data = MakeCompileEvent(script, |
| Factory::undefined_value(), |
| &caught_exception); |
| // Bail out and don't call debugger if exception. |
| if (caught_exception) { |
| return; |
| } |
| |
| // Process debug event |
| ProcessDebugEvent(v8::BeforeCompile, event_data); |
| } |
| |
| |
| // Handle debugger actions when a new script is compiled. |
| void Debugger::OnAfterCompile(Handle<Script> script, Handle<JSFunction> fun) { |
| HandleScope scope; |
| |
| // No compile events while compiling natives. |
| if (compiling_natives()) return; |
| |
| // No more to do if not debugging. |
| if (!debugger_active()) return; |
| |
| // Enter the debugger. Bail out if the debugger cannot be loaded. |
| if (!Debug::Load()) return; |
| SaveBreakFrame save; |
| EnterDebuggerContext enter; |
| |
| // 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-delay.js). |
| Handle<Object> update_script_break_points = |
| Handle<Object>(Debug::debug_context()->global()->GetProperty( |
| *Factory::LookupAsciiSymbol("UpdateScriptBreakPoints"))); |
| if (!update_script_break_points->IsJSFunction()) { |
| return; |
| } |
| ASSERT(update_script_break_points->IsJSFunction()); |
| |
| // Wrap the script object in a proper JS object before passing it |
| // to JavaScript. |
| Handle<JSValue> wrapper = GetScriptWrapper(script); |
| |
| // Call UpdateScriptBreakPoints expect no exceptions. |
| bool caught_exception = false; |
| const int argc = 1; |
| Object** argv[argc] = { reinterpret_cast<Object**>(wrapper.location()) }; |
| Handle<Object> result = Execution::TryCall( |
| Handle<JSFunction>::cast(update_script_break_points), |
| Top::builtins(), argc, argv, |
| &caught_exception); |
| if (caught_exception) { |
| return; |
| } |
| // Bail out based on state or if there is no listener for this event |
| if (Debug::InDebugger()) return; |
| if (!Debugger::EventActive(v8::AfterCompile)) return; |
| |
| // Create the compile state object. |
| Handle<Object> event_data = MakeCompileEvent(script, |
| Factory::undefined_value(), |
| &caught_exception); |
| // Bail out and don't call debugger if exception. |
| if (caught_exception) { |
| return; |
| } |
| // Process debug event |
| ProcessDebugEvent(v8::AfterCompile, event_data); |
| } |
| |
| |
| void Debugger::OnNewFunction(Handle<JSFunction> function) { |
| return; |
| HandleScope scope; |
| |
| // Bail out based on state or if there is no listener for this event |
| if (Debug::InDebugger()) return; |
| if (compiling_natives()) return; |
| if (!Debugger::EventActive(v8::NewFunction)) return; |
| |
| // Enter the debugger. Bail out if the debugger cannot be loaded. |
| if (!Debug::Load()) return; |
| SaveBreakFrame save; |
| EnterDebuggerContext enter; |
| |
| // Create the event object. |
| bool caught_exception = false; |
| Handle<Object> event_data = MakeNewFunctionEvent(function, &caught_exception); |
| // Bail out and don't call debugger if exception. |
| if (caught_exception) { |
| return; |
| } |
| // Process debug event. |
| ProcessDebugEvent(v8::NewFunction, event_data); |
| } |
| |
| |
| void Debugger::ProcessDebugEvent(v8::DebugEvent event, |
| Handle<Object> event_data) { |
| // Create the execution state. |
| bool caught_exception = false; |
| Handle<Object> exec_state = MakeExecutionState(&caught_exception); |
| if (caught_exception) { |
| return; |
| } |
| // First notify the builtin debugger. |
| if (message_thread_ != NULL) { |
| message_thread_->DebugEvent(event, exec_state, event_data); |
| } |
| // Notify registered debug event listeners. The list can contain both C and |
| // JavaScript functions. |
| v8::NeanderArray listeners(Factory::debug_event_listeners()); |
| int length = listeners.length(); |
| for (int i = 0; i < length; i++) { |
| if (listeners.get(i)->IsUndefined()) continue; // Skip deleted ones. |
| v8::NeanderObject listener(JSObject::cast(listeners.get(i))); |
| Handle<Object> callback_data(listener.get(1)); |
| if (listener.get(0)->IsProxy()) { |
| // C debug event listener. |
| Handle<Proxy> callback_obj(Proxy::cast(listener.get(0))); |
| v8::DebugEventCallback callback = |
| FUNCTION_CAST<v8::DebugEventCallback>(callback_obj->proxy()); |
| callback(event, |
| v8::Utils::ToLocal(Handle<JSObject>::cast(exec_state)), |
| v8::Utils::ToLocal(Handle<JSObject>::cast(event_data)), |
| v8::Utils::ToLocal(callback_data)); |
| } else { |
| // JavaScript debug event listener. |
| ASSERT(listener.get(0)->IsJSFunction()); |
| Handle<JSFunction> fun(JSFunction::cast(listener.get(0))); |
| |
| // Invoke the JavaScript debug event listener. |
| const int argc = 4; |
| Object** argv[argc] = { Handle<Object>(Smi::FromInt(event)).location(), |
| exec_state.location(), |
| event_data.location(), |
| callback_data.location() }; |
| Handle<Object> result = Execution::TryCall(fun, Top::global(), |
| argc, argv, &caught_exception); |
| if (caught_exception) { |
| // Silently ignore exceptions from debug event listeners. |
| } |
| } |
| } |
| } |
| |
| |
| void Debugger::SetMessageHandler(v8::DebugMessageHandler handler, void* data) { |
| debug_message_handler_ = handler; |
| debug_message_handler_data_ = data; |
| if (!message_thread_) { |
| message_thread_ = new DebugMessageThread(); |
| message_thread_->Start(); |
| } |
| UpdateActiveDebugger(); |
| } |
| |
| |
| // Posts an output message from the debugger to the debug_message_handler |
| // callback. This callback is part of the public API. Messages are |
| // kept internally as Vector<uint16_t> strings, which are allocated in various |
| // places and deallocated by the calling function sometime after this call. |
| void Debugger::SendMessage(Vector< uint16_t> message) { |
| if (debug_message_handler_ != NULL) { |
| debug_message_handler_(message.start(), message.length(), |
| debug_message_handler_data_); |
| } |
| } |
| |
| |
| void Debugger::ProcessCommand(Vector<const uint16_t> command) { |
| if (message_thread_ != NULL) { |
| message_thread_->ProcessCommand( |
| Vector<uint16_t>(const_cast<uint16_t *>(command.start()), |
| command.length())); |
| } |
| } |
| |
| |
| void Debugger::UpdateActiveDebugger() { |
| v8::NeanderArray listeners(Factory::debug_event_listeners()); |
| int length = listeners.length(); |
| bool active_listener = false; |
| for (int i = 0; i < length && !active_listener; i++) { |
| active_listener = !listeners.get(i)->IsUndefined(); |
| } |
| set_debugger_active((Debugger::message_thread_ != NULL && |
| Debugger::debug_message_handler_ != NULL) || |
| active_listener); |
| if (!debugger_active() && message_thread_) |
| message_thread_->OnDebuggerInactive(); |
| } |
| |
| |
| DebugMessageThread::DebugMessageThread() |
| : host_running_(true), |
| command_queue_(kQueueInitialSize), |
| message_queue_(kQueueInitialSize) { |
| command_received_ = OS::CreateSemaphore(0); |
| message_received_ = OS::CreateSemaphore(0); |
| } |
| |
| // Does not free resources held by DebugMessageThread |
| // because this cannot be done thread-safely. |
| DebugMessageThread::~DebugMessageThread() { |
| } |
| |
| |
| // Puts an event coming from V8 on the queue. Creates |
| // a copy of the JSON formatted event string managed by the V8. |
| // Called by the V8 thread. |
| // The new copy of the event string is destroyed in Run(). |
| void DebugMessageThread::SendMessage(Vector<uint16_t> message) { |
| Vector<uint16_t> message_copy = message.Clone(); |
| Logger::DebugTag("Put message on event message_queue."); |
| message_queue_.Put(message_copy); |
| message_received_->Signal(); |
| } |
| |
| |
| void DebugMessageThread::SetEventJSONFromEvent(Handle<Object> event_data) { |
| v8::HandleScope scope; |
| // Call toJSONProtocol on the debug event object. |
| v8::Local<v8::Object> api_event_data = |
| v8::Utils::ToLocal(Handle<JSObject>::cast(event_data)); |
| v8::Local<v8::String> fun_name = v8::String::New("toJSONProtocol"); |
| v8::Local<v8::Function> fun = |
| v8::Function::Cast(*api_event_data->Get(fun_name)); |
| v8::TryCatch try_catch; |
| v8::Local<v8::Value> json_event = *fun->Call(api_event_data, 0, NULL); |
| v8::Local<v8::String> json_event_string; |
| if (!try_catch.HasCaught()) { |
| if (!json_event->IsUndefined()) { |
| json_event_string = json_event->ToString(); |
| if (FLAG_trace_debug_json) { |
| PrintLn(json_event_string); |
| } |
| v8::String::Value val(json_event_string); |
| Vector<uint16_t> str(reinterpret_cast<uint16_t*>(*val), |
| json_event_string->Length()); |
| SendMessage(str); |
| } else { |
| SendMessage(Vector<uint16_t>::empty()); |
| } |
| } else { |
| PrintLn(try_catch.Exception()); |
| SendMessage(Vector<uint16_t>::empty()); |
| } |
| } |
| |
| |
| void DebugMessageThread::Run() { |
| // Sends debug events to an installed debugger message callback. |
| while (true) { |
| // Wait and Get are paired so that semaphore count equals queue length. |
| message_received_->Wait(); |
| Logger::DebugTag("Get message from event message_queue."); |
| Vector<uint16_t> message = message_queue_.Get(); |
| if (message.length() > 0) { |
| Debugger::SendMessage(message); |
| } |
| } |
| } |
| |
| |
| // This method is called by the V8 thread whenever a debug event occurs in |
| // the VM. |
| void DebugMessageThread::DebugEvent(v8::DebugEvent event, |
| Handle<Object> exec_state, |
| Handle<Object> event_data) { |
| if (!Debug::Load()) return; |
| |
| // Process the individual events. |
| bool interactive = false; |
| switch (event) { |
| case v8::Break: |
| interactive = true; // Break event is always interavtive |
| break; |
| case v8::Exception: |
| interactive = true; // Exception event is always interavtive |
| break; |
| case v8::BeforeCompile: |
| break; |
| case v8::AfterCompile: |
| break; |
| case v8::NewFunction: |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| |
| // Done if not interactive. |
| if (!interactive) return; |
| |
| // Get the DebugCommandProcessor. |
| v8::Local<v8::Object> api_exec_state = |
| v8::Utils::ToLocal(Handle<JSObject>::cast(exec_state)); |
| v8::Local<v8::String> fun_name = |
| v8::String::New("debugCommandProcessor"); |
| v8::Local<v8::Function> fun = |
| v8::Function::Cast(*api_exec_state->Get(fun_name)); |
| v8::TryCatch try_catch; |
| v8::Local<v8::Object> cmd_processor = |
| v8::Object::Cast(*fun->Call(api_exec_state, 0, NULL)); |
| if (try_catch.HasCaught()) { |
| PrintLn(try_catch.Exception()); |
| return; |
| } |
| |
| // Notify the debugger that a debug event has occoured. |
| host_running_ = false; |
| SetEventJSONFromEvent(event_data); |
| |
| // Wait for commands from the debugger. |
| while (true) { |
| command_received_->Wait(); |
| Logger::DebugTag("Get command from command queue, in interactive loop."); |
| Vector<uint16_t> command = command_queue_.Get(); |
| ASSERT(!host_running_); |
| if (!Debugger::debugger_active()) { |
| host_running_ = true; |
| return; |
| } |
| |
| // Invoke the JavaScript to convert the debug command line to a JSON |
| // request, invoke the JSON request and convert the JSON response to a text |
| // representation. |
| v8::Local<v8::String> fun_name; |
| v8::Local<v8::Function> fun; |
| v8::Local<v8::Value> args[1]; |
| v8::TryCatch try_catch; |
| fun_name = v8::String::New("processDebugCommand"); |
| fun = v8::Function::Cast(*cmd_processor->Get(fun_name)); |
| args[0] = v8::String::New(reinterpret_cast<uint16_t*>(command.start()), |
| command.length()); |
| v8::Local<v8::Value> result_val = fun->Call(cmd_processor, 1, args); |
| |
| // Get the result of the command. |
| v8::Local<v8::String> result_string; |
| bool running = false; |
| if (!try_catch.HasCaught()) { |
| // Get the result as an object. |
| v8::Local<v8::Object> result = v8::Object::Cast(*result_val); |
| |
| // Log the JSON request/response. |
| if (FLAG_trace_debug_json) { |
| PrintLn(result->Get(v8::String::New("request"))); |
| PrintLn(result->Get(v8::String::New("response"))); |
| } |
| |
| // Get the running state. |
| running = result->Get(v8::String::New("running"))->ToBoolean()->Value(); |
| |
| // Get result text. |
| v8::Local<v8::Value> text_result = |
| result->Get(v8::String::New("response")); |
| if (!text_result->IsUndefined()) { |
| result_string = text_result->ToString(); |
| } else { |
| result_string = v8::String::New(""); |
| } |
| } else { |
| // In case of failure the result text is the exception text. |
| result_string = try_catch.Exception()->ToString(); |
| } |
| |
| // Convert text result to C string. |
| v8::String::Value val(result_string); |
| Vector<uint16_t> str(reinterpret_cast<uint16_t*>(*val), |
| result_string->Length()); |
| |
| // Set host_running_ correctly for nested debugger evaluations. |
| host_running_ = running; |
| |
| // Return the result. |
| SendMessage(str); |
| |
| // Return from debug event processing is VM should be running. |
| if (running) { |
| return; |
| } |
| } |
| } |
| |
| |
| // 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. This is where the API client hands off |
| // processing of the command to the DebugMessageThread thread. |
| // The new copy of the command is destroyed in HandleCommand(). |
| void DebugMessageThread::ProcessCommand(Vector<uint16_t> command) { |
| Vector<uint16_t> command_copy = command.Clone(); |
| Logger::DebugTag("Put command on command_queue."); |
| command_queue_.Put(command_copy); |
| command_received_->Signal(); |
| } |
| |
| |
| void DebugMessageThread::OnDebuggerInactive() { |
| // Send an empty command to the debugger if in a break to make JavaScript run |
| // again if the debugger is closed. |
| if (!host_running_) { |
| ProcessCommand(Vector<uint16_t>::empty()); |
| } |
| } |
| |
| |
| MessageQueue::MessageQueue(int size) : start_(0), end_(0), size_(size) { |
| messages_ = NewArray<Vector<uint16_t> >(size); |
| } |
| |
| |
| MessageQueue::~MessageQueue() { |
| DeleteArray(messages_); |
| } |
| |
| |
| Vector<uint16_t> MessageQueue::Get() { |
| ASSERT(!IsEmpty()); |
| int result = start_; |
| start_ = (start_ + 1) % size_; |
| return messages_[result]; |
| } |
| |
| |
| void MessageQueue::Put(const Vector<uint16_t>& message) { |
| if ((end_ + 1) % size_ == start_) { |
| Expand(); |
| } |
| messages_[end_] = message; |
| end_ = (end_ + 1) % size_; |
| } |
| |
| |
| void MessageQueue::Expand() { |
| MessageQueue new_queue(size_ * 2); |
| while (!IsEmpty()) { |
| new_queue.Put(Get()); |
| } |
| Vector<uint16_t>* array_to_free = messages_; |
| *this = new_queue; |
| new_queue.messages_ = array_to_free; |
| // Automatic destructor called on new_queue, freeing array_to_free. |
| } |
| |
| |
| LockingMessageQueue::LockingMessageQueue(int size) : queue_(size) { |
| lock_ = OS::CreateMutex(); |
| } |
| |
| |
| LockingMessageQueue::~LockingMessageQueue() { |
| delete lock_; |
| } |
| |
| |
| bool LockingMessageQueue::IsEmpty() const { |
| ScopedLock sl(lock_); |
| return queue_.IsEmpty(); |
| } |
| |
| |
| Vector<uint16_t> LockingMessageQueue::Get() { |
| ScopedLock sl(lock_); |
| Vector<uint16_t> result = queue_.Get(); |
| Logger::DebugEvent("Get", result); |
| return result; |
| } |
| |
| |
| void LockingMessageQueue::Put(const Vector<uint16_t>& message) { |
| ScopedLock sl(lock_); |
| queue_.Put(message); |
| Logger::DebugEvent("Put", message); |
| } |
| |
| |
| void LockingMessageQueue::Clear() { |
| ScopedLock sl(lock_); |
| queue_.Clear(); |
| } |
| |
| |
| } } // namespace v8::internal |