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Diffstat (limited to 'src/3rdparty/v8/src/isolate.cc')
| -rw-r--r-- | src/3rdparty/v8/src/isolate.cc | 1909 |
1 files changed, 1909 insertions, 0 deletions
diff --git a/src/3rdparty/v8/src/isolate.cc b/src/3rdparty/v8/src/isolate.cc new file mode 100644 index 0000000..a073af9 --- /dev/null +++ b/src/3rdparty/v8/src/isolate.cc @@ -0,0 +1,1909 @@ +// Copyright 2011 the V8 project authors. 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 <stdlib.h> + +#include "v8.h" + +#include "ast.h" +#include "bootstrapper.h" +#include "codegen.h" +#include "compilation-cache.h" +#include "debug.h" +#include "deoptimizer.h" +#include "heap-profiler.h" +#include "hydrogen.h" +#include "isolate.h" +#include "lithium-allocator.h" +#include "log.h" +#include "messages.h" +#include "regexp-stack.h" +#include "runtime-profiler.h" +#include "scopeinfo.h" +#include "serialize.h" +#include "simulator.h" +#include "spaces.h" +#include "stub-cache.h" +#include "version.h" +#include "vm-state-inl.h" + + +namespace v8 { +namespace internal { + +Atomic32 ThreadId::highest_thread_id_ = 0; + +int ThreadId::AllocateThreadId() { + int new_id = NoBarrier_AtomicIncrement(&highest_thread_id_, 1); + return new_id; +} + + +int ThreadId::GetCurrentThreadId() { + int thread_id = Thread::GetThreadLocalInt(Isolate::thread_id_key_); + if (thread_id == 0) { + thread_id = AllocateThreadId(); + Thread::SetThreadLocalInt(Isolate::thread_id_key_, thread_id); + } + return thread_id; +} + + +ThreadLocalTop::ThreadLocalTop() { + InitializeInternal(); + // This flag may be set using v8::V8::IgnoreOutOfMemoryException() + // before an isolate is initialized. The initialize methods below do + // not touch it to preserve its value. + ignore_out_of_memory_ = false; +} + + +void ThreadLocalTop::InitializeInternal() { + c_entry_fp_ = 0; + handler_ = 0; +#ifdef USE_SIMULATOR + simulator_ = NULL; +#endif + js_entry_sp_ = NULL; + external_callback_ = NULL; + current_vm_state_ = EXTERNAL; + try_catch_handler_address_ = NULL; + context_ = NULL; + thread_id_ = ThreadId::Invalid(); + external_caught_exception_ = false; + failed_access_check_callback_ = NULL; + save_context_ = NULL; + catcher_ = NULL; + top_lookup_result_ = NULL; + + // These members are re-initialized later after deserialization + // is complete. + pending_exception_ = NULL; + has_pending_message_ = false; + pending_message_obj_ = NULL; + pending_message_script_ = NULL; + scheduled_exception_ = NULL; +} + + +void ThreadLocalTop::Initialize() { + InitializeInternal(); +#ifdef USE_SIMULATOR +#ifdef V8_TARGET_ARCH_ARM + simulator_ = Simulator::current(isolate_); +#elif V8_TARGET_ARCH_MIPS + simulator_ = Simulator::current(isolate_); +#endif +#endif + thread_id_ = ThreadId::Current(); +} + + +v8::TryCatch* ThreadLocalTop::TryCatchHandler() { + return TRY_CATCH_FROM_ADDRESS(try_catch_handler_address()); +} + + +// Create a dummy thread that will wait forever on a semaphore. The only +// purpose for this thread is to have some stack area to save essential data +// into for use by a stacks only core dump (aka minidump). +class PreallocatedMemoryThread: public Thread { + public: + char* data() { + if (data_ready_semaphore_ != NULL) { + // Initial access is guarded until the data has been published. + data_ready_semaphore_->Wait(); + delete data_ready_semaphore_; + data_ready_semaphore_ = NULL; + } + return data_; + } + + unsigned length() { + if (data_ready_semaphore_ != NULL) { + // Initial access is guarded until the data has been published. + data_ready_semaphore_->Wait(); + delete data_ready_semaphore_; + data_ready_semaphore_ = NULL; + } + return length_; + } + + // Stop the PreallocatedMemoryThread and release its resources. + void StopThread() { + keep_running_ = false; + wait_for_ever_semaphore_->Signal(); + + // Wait for the thread to terminate. + Join(); + + if (data_ready_semaphore_ != NULL) { + delete data_ready_semaphore_; + data_ready_semaphore_ = NULL; + } + + delete wait_for_ever_semaphore_; + wait_for_ever_semaphore_ = NULL; + } + + protected: + // When the thread starts running it will allocate a fixed number of bytes + // on the stack and publish the location of this memory for others to use. + void Run() { + EmbeddedVector<char, 15 * 1024> local_buffer; + + // Initialize the buffer with a known good value. + OS::StrNCpy(local_buffer, "Trace data was not generated.\n", + local_buffer.length()); + + // Publish the local buffer and signal its availability. + data_ = local_buffer.start(); + length_ = local_buffer.length(); + data_ready_semaphore_->Signal(); + + while (keep_running_) { + // This thread will wait here until the end of time. + wait_for_ever_semaphore_->Wait(); + } + + // Make sure we access the buffer after the wait to remove all possibility + // of it being optimized away. + OS::StrNCpy(local_buffer, "PreallocatedMemoryThread shutting down.\n", + local_buffer.length()); + } + + + private: + PreallocatedMemoryThread() + : Thread("v8:PreallocMem"), + keep_running_(true), + wait_for_ever_semaphore_(OS::CreateSemaphore(0)), + data_ready_semaphore_(OS::CreateSemaphore(0)), + data_(NULL), + length_(0) { + } + + // Used to make sure that the thread keeps looping even for spurious wakeups. + bool keep_running_; + + // This semaphore is used by the PreallocatedMemoryThread to wait for ever. + Semaphore* wait_for_ever_semaphore_; + // Semaphore to signal that the data has been initialized. + Semaphore* data_ready_semaphore_; + + // Location and size of the preallocated memory block. + char* data_; + unsigned length_; + + friend class Isolate; + + DISALLOW_COPY_AND_ASSIGN(PreallocatedMemoryThread); +}; + + +void Isolate::PreallocatedMemoryThreadStart() { + if (preallocated_memory_thread_ != NULL) return; + preallocated_memory_thread_ = new PreallocatedMemoryThread(); + preallocated_memory_thread_->Start(); +} + + +void Isolate::PreallocatedMemoryThreadStop() { + if (preallocated_memory_thread_ == NULL) return; + preallocated_memory_thread_->StopThread(); + // Done with the thread entirely. + delete preallocated_memory_thread_; + preallocated_memory_thread_ = NULL; +} + + +void Isolate::PreallocatedStorageInit(size_t size) { + ASSERT(free_list_.next_ == &free_list_); + ASSERT(free_list_.previous_ == &free_list_); + PreallocatedStorage* free_chunk = + reinterpret_cast<PreallocatedStorage*>(new char[size]); + free_list_.next_ = free_list_.previous_ = free_chunk; + free_chunk->next_ = free_chunk->previous_ = &free_list_; + free_chunk->size_ = size - sizeof(PreallocatedStorage); + preallocated_storage_preallocated_ = true; +} + + +void* Isolate::PreallocatedStorageNew(size_t size) { + if (!preallocated_storage_preallocated_) { + return FreeStoreAllocationPolicy::New(size); + } + ASSERT(free_list_.next_ != &free_list_); + ASSERT(free_list_.previous_ != &free_list_); + + size = (size + kPointerSize - 1) & ~(kPointerSize - 1); + // Search for exact fit. + for (PreallocatedStorage* storage = free_list_.next_; + storage != &free_list_; + storage = storage->next_) { + if (storage->size_ == size) { + storage->Unlink(); + storage->LinkTo(&in_use_list_); + return reinterpret_cast<void*>(storage + 1); + } + } + // Search for first fit. + for (PreallocatedStorage* storage = free_list_.next_; + storage != &free_list_; + storage = storage->next_) { + if (storage->size_ >= size + sizeof(PreallocatedStorage)) { + storage->Unlink(); + storage->LinkTo(&in_use_list_); + PreallocatedStorage* left_over = + reinterpret_cast<PreallocatedStorage*>( + reinterpret_cast<char*>(storage + 1) + size); + left_over->size_ = storage->size_ - size - sizeof(PreallocatedStorage); + ASSERT(size + left_over->size_ + sizeof(PreallocatedStorage) == + storage->size_); + storage->size_ = size; + left_over->LinkTo(&free_list_); + return reinterpret_cast<void*>(storage + 1); + } + } + // Allocation failure. + ASSERT(false); + return NULL; +} + + +// We don't attempt to coalesce. +void Isolate::PreallocatedStorageDelete(void* p) { + if (p == NULL) { + return; + } + if (!preallocated_storage_preallocated_) { + FreeStoreAllocationPolicy::Delete(p); + return; + } + PreallocatedStorage* storage = reinterpret_cast<PreallocatedStorage*>(p) - 1; + ASSERT(storage->next_->previous_ == storage); + ASSERT(storage->previous_->next_ == storage); + storage->Unlink(); + storage->LinkTo(&free_list_); +} + + +Isolate* Isolate::default_isolate_ = NULL; +Thread::LocalStorageKey Isolate::isolate_key_; +Thread::LocalStorageKey Isolate::thread_id_key_; +Thread::LocalStorageKey Isolate::per_isolate_thread_data_key_; +Mutex* Isolate::process_wide_mutex_ = OS::CreateMutex(); +Isolate::ThreadDataTable* Isolate::thread_data_table_ = NULL; + + +class IsolateInitializer { + public: + IsolateInitializer() { + Isolate::EnsureDefaultIsolate(); + } +}; + +static IsolateInitializer* EnsureDefaultIsolateAllocated() { + // TODO(isolates): Use the system threading API to do this once? + static IsolateInitializer static_initializer; + return &static_initializer; +} + +// This variable only needed to trigger static intialization. +static IsolateInitializer* static_initializer = EnsureDefaultIsolateAllocated(); + + + + + +Isolate::PerIsolateThreadData* Isolate::AllocatePerIsolateThreadData( + ThreadId thread_id) { + ASSERT(!thread_id.Equals(ThreadId::Invalid())); + PerIsolateThreadData* per_thread = new PerIsolateThreadData(this, thread_id); + { + ScopedLock lock(process_wide_mutex_); + ASSERT(thread_data_table_->Lookup(this, thread_id) == NULL); + thread_data_table_->Insert(per_thread); + ASSERT(thread_data_table_->Lookup(this, thread_id) == per_thread); + } + return per_thread; +} + + +Isolate::PerIsolateThreadData* + Isolate::FindOrAllocatePerThreadDataForThisThread() { + ThreadId thread_id = ThreadId::Current(); + PerIsolateThreadData* per_thread = NULL; + { + ScopedLock lock(process_wide_mutex_); + per_thread = thread_data_table_->Lookup(this, thread_id); + if (per_thread == NULL) { + per_thread = AllocatePerIsolateThreadData(thread_id); + } + } + return per_thread; +} + + +Isolate::PerIsolateThreadData* Isolate::FindPerThreadDataForThisThread() { + ThreadId thread_id = ThreadId::Current(); + PerIsolateThreadData* per_thread = NULL; + { + ScopedLock lock(process_wide_mutex_); + per_thread = thread_data_table_->Lookup(this, thread_id); + } + return per_thread; +} + + +void Isolate::EnsureDefaultIsolate() { + ScopedLock lock(process_wide_mutex_); + if (default_isolate_ == NULL) { + isolate_key_ = Thread::CreateThreadLocalKey(); + thread_id_key_ = Thread::CreateThreadLocalKey(); + per_isolate_thread_data_key_ = Thread::CreateThreadLocalKey(); + thread_data_table_ = new Isolate::ThreadDataTable(); + default_isolate_ = new Isolate(); + } + // Can't use SetIsolateThreadLocals(default_isolate_, NULL) here + // becase a non-null thread data may be already set. + if (Thread::GetThreadLocal(isolate_key_) == NULL) { + Thread::SetThreadLocal(isolate_key_, default_isolate_); + } +} + + +#ifdef ENABLE_DEBUGGER_SUPPORT +Debugger* Isolate::GetDefaultIsolateDebugger() { + EnsureDefaultIsolate(); + return default_isolate_->debugger(); +} +#endif + + +StackGuard* Isolate::GetDefaultIsolateStackGuard() { + EnsureDefaultIsolate(); + return default_isolate_->stack_guard(); +} + + +void Isolate::EnterDefaultIsolate() { + EnsureDefaultIsolate(); + ASSERT(default_isolate_ != NULL); + + PerIsolateThreadData* data = CurrentPerIsolateThreadData(); + // If not yet in default isolate - enter it. + if (data == NULL || data->isolate() != default_isolate_) { + default_isolate_->Enter(); + } +} + + +Isolate* Isolate::GetDefaultIsolateForLocking() { + EnsureDefaultIsolate(); + return default_isolate_; +} + + +Address Isolate::get_address_from_id(Isolate::AddressId id) { + return isolate_addresses_[id]; +} + + +char* Isolate::Iterate(ObjectVisitor* v, char* thread_storage) { + ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage); + Iterate(v, thread); + return thread_storage + sizeof(ThreadLocalTop); +} + + +void Isolate::IterateThread(ThreadVisitor* v) { + v->VisitThread(this, thread_local_top()); +} + + +void Isolate::IterateThread(ThreadVisitor* v, char* t) { + ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(t); + v->VisitThread(this, thread); +} + + +void Isolate::Iterate(ObjectVisitor* v, ThreadLocalTop* thread) { + // Visit the roots from the top for a given thread. + Object* pending; + // The pending exception can sometimes be a failure. We can't show + // that to the GC, which only understands objects. + if (thread->pending_exception_->ToObject(&pending)) { + v->VisitPointer(&pending); + thread->pending_exception_ = pending; // In case GC updated it. + } + v->VisitPointer(&(thread->pending_message_obj_)); + v->VisitPointer(BitCast<Object**>(&(thread->pending_message_script_))); + v->VisitPointer(BitCast<Object**>(&(thread->context_))); + Object* scheduled; + if (thread->scheduled_exception_->ToObject(&scheduled)) { + v->VisitPointer(&scheduled); + thread->scheduled_exception_ = scheduled; + } + + for (v8::TryCatch* block = thread->TryCatchHandler(); + block != NULL; + block = TRY_CATCH_FROM_ADDRESS(block->next_)) { + v->VisitPointer(BitCast<Object**>(&(block->exception_))); + v->VisitPointer(BitCast<Object**>(&(block->message_))); + } + + // Iterate over pointers on native execution stack. + for (StackFrameIterator it(this, thread); !it.done(); it.Advance()) { + it.frame()->Iterate(v); + } + + // Iterate pointers in live lookup results. + thread->top_lookup_result_->Iterate(v); +} + + +void Isolate::Iterate(ObjectVisitor* v) { + ThreadLocalTop* current_t = thread_local_top(); + Iterate(v, current_t); +} + + +void Isolate::RegisterTryCatchHandler(v8::TryCatch* that) { + // The ARM simulator has a separate JS stack. We therefore register + // the C++ try catch handler with the simulator and get back an + // address that can be used for comparisons with addresses into the + // JS stack. When running without the simulator, the address + // returned will be the address of the C++ try catch handler itself. + Address address = reinterpret_cast<Address>( + SimulatorStack::RegisterCTryCatch(reinterpret_cast<uintptr_t>(that))); + thread_local_top()->set_try_catch_handler_address(address); +} + + +void Isolate::UnregisterTryCatchHandler(v8::TryCatch* that) { + ASSERT(thread_local_top()->TryCatchHandler() == that); + thread_local_top()->set_try_catch_handler_address( + reinterpret_cast<Address>(that->next_)); + thread_local_top()->catcher_ = NULL; + SimulatorStack::UnregisterCTryCatch(); +} + + +Handle<String> Isolate::StackTraceString() { + if (stack_trace_nesting_level_ == 0) { + stack_trace_nesting_level_++; + HeapStringAllocator allocator; + StringStream::ClearMentionedObjectCache(); + StringStream accumulator(&allocator); + incomplete_message_ = &accumulator; + PrintStack(&accumulator); + Handle<String> stack_trace = accumulator.ToString(); + incomplete_message_ = NULL; + stack_trace_nesting_level_ = 0; + return stack_trace; + } else if (stack_trace_nesting_level_ == 1) { + stack_trace_nesting_level_++; + OS::PrintError( + "\n\nAttempt to print stack while printing stack (double fault)\n"); + OS::PrintError( + "If you are lucky you may find a partial stack dump on stdout.\n\n"); + incomplete_message_->OutputToStdOut(); + return factory()->empty_symbol(); + } else { + OS::Abort(); + // Unreachable + return factory()->empty_symbol(); + } +} + + +Handle<JSArray> Isolate::CaptureCurrentStackTrace( + int frame_limit, StackTrace::StackTraceOptions options) { + // Ensure no negative values. + int limit = Max(frame_limit, 0); + Handle<JSArray> stack_trace = factory()->NewJSArray(frame_limit); + + Handle<String> column_key = factory()->LookupAsciiSymbol("column"); + Handle<String> line_key = factory()->LookupAsciiSymbol("lineNumber"); + Handle<String> script_key = factory()->LookupAsciiSymbol("scriptName"); + Handle<String> name_or_source_url_key = + factory()->LookupAsciiSymbol("nameOrSourceURL"); + Handle<String> script_name_or_source_url_key = + factory()->LookupAsciiSymbol("scriptNameOrSourceURL"); + Handle<String> function_key = factory()->LookupAsciiSymbol("functionName"); + Handle<String> eval_key = factory()->LookupAsciiSymbol("isEval"); + Handle<String> constructor_key = + factory()->LookupAsciiSymbol("isConstructor"); + + StackTraceFrameIterator it(this); + int frames_seen = 0; + while (!it.done() && (frames_seen < limit)) { + JavaScriptFrame* frame = it.frame(); + // Set initial size to the maximum inlining level + 1 for the outermost + // function. + List<FrameSummary> frames(Compiler::kMaxInliningLevels + 1); + frame->Summarize(&frames); + for (int i = frames.length() - 1; i >= 0 && frames_seen < limit; i--) { + // Create a JSObject to hold the information for the StackFrame. + Handle<JSObject> stackFrame = factory()->NewJSObject(object_function()); + + Handle<JSFunction> fun = frames[i].function(); + Handle<Script> script(Script::cast(fun->shared()->script())); + + if (options & StackTrace::kLineNumber) { + int script_line_offset = script->line_offset()->value(); + int position = frames[i].code()->SourcePosition(frames[i].pc()); + int line_number = GetScriptLineNumber(script, position); + // line_number is already shifted by the script_line_offset. + int relative_line_number = line_number - script_line_offset; + if (options & StackTrace::kColumnOffset && relative_line_number >= 0) { + Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends())); + int start = (relative_line_number == 0) ? 0 : + Smi::cast(line_ends->get(relative_line_number - 1))->value() + 1; + int column_offset = position - start; + if (relative_line_number == 0) { + // For the case where the code is on the same line as the script + // tag. + column_offset += script->column_offset()->value(); + } + SetLocalPropertyNoThrow(stackFrame, column_key, + Handle<Smi>(Smi::FromInt(column_offset + 1))); + } + SetLocalPropertyNoThrow(stackFrame, line_key, + Handle<Smi>(Smi::FromInt(line_number + 1))); + } + + if (options & StackTrace::kScriptName) { + Handle<Object> script_name(script->name(), this); + SetLocalPropertyNoThrow(stackFrame, script_key, script_name); + } + + if (options & StackTrace::kScriptNameOrSourceURL) { + Handle<Object> script_name(script->name(), this); + Handle<JSValue> script_wrapper = GetScriptWrapper(script); + Handle<Object> property = GetProperty(script_wrapper, + name_or_source_url_key); + ASSERT(property->IsJSFunction()); + Handle<JSFunction> method = Handle<JSFunction>::cast(property); + bool caught_exception; + Handle<Object> result = Execution::TryCall(method, script_wrapper, 0, + NULL, &caught_exception); + if (caught_exception) { + result = factory()->undefined_value(); + } + SetLocalPropertyNoThrow(stackFrame, script_name_or_source_url_key, + result); + } + + if (options & StackTrace::kFunctionName) { + Handle<Object> fun_name(fun->shared()->name(), this); + if (fun_name->ToBoolean()->IsFalse()) { + fun_name = Handle<Object>(fun->shared()->inferred_name(), this); + } + SetLocalPropertyNoThrow(stackFrame, function_key, fun_name); + } + + if (options & StackTrace::kIsEval) { + int type = Smi::cast(script->compilation_type())->value(); + Handle<Object> is_eval = (type == Script::COMPILATION_TYPE_EVAL) ? + factory()->true_value() : factory()->false_value(); + SetLocalPropertyNoThrow(stackFrame, eval_key, is_eval); + } + + if (options & StackTrace::kIsConstructor) { + Handle<Object> is_constructor = (frames[i].is_constructor()) ? + factory()->true_value() : factory()->false_value(); + SetLocalPropertyNoThrow(stackFrame, constructor_key, is_constructor); + } + + FixedArray::cast(stack_trace->elements())->set(frames_seen, *stackFrame); + frames_seen++; + } + it.Advance(); + } + + stack_trace->set_length(Smi::FromInt(frames_seen)); + return stack_trace; +} + + +void Isolate::PrintStack() { + if (stack_trace_nesting_level_ == 0) { + stack_trace_nesting_level_++; + + StringAllocator* allocator; + if (preallocated_message_space_ == NULL) { + allocator = new HeapStringAllocator(); + } else { + allocator = preallocated_message_space_; + } + + StringStream::ClearMentionedObjectCache(); + StringStream accumulator(allocator); + incomplete_message_ = &accumulator; + PrintStack(&accumulator); + accumulator.OutputToStdOut(); + InitializeLoggingAndCounters(); + accumulator.Log(); + incomplete_message_ = NULL; + stack_trace_nesting_level_ = 0; + if (preallocated_message_space_ == NULL) { + // Remove the HeapStringAllocator created above. + delete allocator; + } + } else if (stack_trace_nesting_level_ == 1) { + stack_trace_nesting_level_++; + OS::PrintError( + "\n\nAttempt to print stack while printing stack (double fault)\n"); + OS::PrintError( + "If you are lucky you may find a partial stack dump on stdout.\n\n"); + incomplete_message_->OutputToStdOut(); + } +} + + +static void PrintFrames(StringStream* accumulator, + StackFrame::PrintMode mode) { + StackFrameIterator it; + for (int i = 0; !it.done(); it.Advance()) { + it.frame()->Print(accumulator, mode, i++); + } +} + + +void Isolate::PrintStack(StringStream* accumulator) { + if (!IsInitialized()) { + accumulator->Add( + "\n==== Stack trace is not available ==========================\n\n"); + accumulator->Add( + "\n==== Isolate for the thread is not initialized =============\n\n"); + return; + } + // The MentionedObjectCache is not GC-proof at the moment. + AssertNoAllocation nogc; + ASSERT(StringStream::IsMentionedObjectCacheClear()); + + // Avoid printing anything if there are no frames. + if (c_entry_fp(thread_local_top()) == 0) return; + + accumulator->Add( + "\n==== Stack trace ============================================\n\n"); + PrintFrames(accumulator, StackFrame::OVERVIEW); + + accumulator->Add( + "\n==== Details ================================================\n\n"); + PrintFrames(accumulator, StackFrame::DETAILS); + + accumulator->PrintMentionedObjectCache(); + accumulator->Add("=====================\n\n"); +} + + +void Isolate::SetFailedAccessCheckCallback( + v8::FailedAccessCheckCallback callback) { + thread_local_top()->failed_access_check_callback_ = callback; +} + + +void Isolate::ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type) { + if (!thread_local_top()->failed_access_check_callback_) return; + + ASSERT(receiver->IsAccessCheckNeeded()); + ASSERT(context()); + + // Get the data object from access check info. + JSFunction* constructor = JSFunction::cast(receiver->map()->constructor()); + if (!constructor->shared()->IsApiFunction()) return; + Object* data_obj = + constructor->shared()->get_api_func_data()->access_check_info(); + if (data_obj == heap_.undefined_value()) return; + + HandleScope scope; + Handle<JSObject> receiver_handle(receiver); + Handle<Object> data(AccessCheckInfo::cast(data_obj)->data()); + thread_local_top()->failed_access_check_callback_( + v8::Utils::ToLocal(receiver_handle), + type, + v8::Utils::ToLocal(data)); +} + + +enum MayAccessDecision { + YES, NO, UNKNOWN +}; + + +static MayAccessDecision MayAccessPreCheck(Isolate* isolate, + JSObject* receiver, + v8::AccessType type) { + // During bootstrapping, callback functions are not enabled yet. + if (isolate->bootstrapper()->IsActive()) return YES; + + if (receiver->IsJSGlobalProxy()) { + Object* receiver_context = JSGlobalProxy::cast(receiver)->context(); + if (!receiver_context->IsContext()) return NO; + + // Get the global context of current top context. + // avoid using Isolate::global_context() because it uses Handle. + Context* global_context = isolate->context()->global()->global_context(); + if (receiver_context == global_context) return YES; + + if (Context::cast(receiver_context)->security_token() == + global_context->security_token()) + return YES; + } + + return UNKNOWN; +} + + +bool Isolate::MayNamedAccess(JSObject* receiver, Object* key, + v8::AccessType type) { + ASSERT(receiver->IsAccessCheckNeeded()); + + // The callers of this method are not expecting a GC. + AssertNoAllocation no_gc; + + // Skip checks for hidden properties access. Note, we do not + // require existence of a context in this case. + if (key == heap_.hidden_symbol()) return true; + + // Check for compatibility between the security tokens in the + // current lexical context and the accessed object. + ASSERT(context()); + + MayAccessDecision decision = MayAccessPreCheck(this, receiver, type); + if (decision != UNKNOWN) return decision == YES; + + // Get named access check callback + JSFunction* constructor = JSFunction::cast(receiver->map()->constructor()); + if (!constructor->shared()->IsApiFunction()) return false; + + Object* data_obj = + constructor->shared()->get_api_func_data()->access_check_info(); + if (data_obj == heap_.undefined_value()) return false; + + Object* fun_obj = AccessCheckInfo::cast(data_obj)->named_callback(); + v8::NamedSecurityCallback callback = + v8::ToCData<v8::NamedSecurityCallback>(fun_obj); + + if (!callback) return false; + + HandleScope scope(this); + Handle<JSObject> receiver_handle(receiver, this); + Handle<Object> key_handle(key, this); + Handle<Object> data(AccessCheckInfo::cast(data_obj)->data(), this); + LOG(this, ApiNamedSecurityCheck(key)); + bool result = false; + { + // Leaving JavaScript. + VMState state(this, EXTERNAL); + result = callback(v8::Utils::ToLocal(receiver_handle), + v8::Utils::ToLocal(key_handle), + type, + v8::Utils::ToLocal(data)); + } + return result; +} + + +bool Isolate::MayIndexedAccess(JSObject* receiver, + uint32_t index, + v8::AccessType type) { + ASSERT(receiver->IsAccessCheckNeeded()); + // Check for compatibility between the security tokens in the + // current lexical context and the accessed object. + ASSERT(context()); + + MayAccessDecision decision = MayAccessPreCheck(this, receiver, type); + if (decision != UNKNOWN) return decision == YES; + + // Get indexed access check callback + JSFunction* constructor = JSFunction::cast(receiver->map()->constructor()); + if (!constructor->shared()->IsApiFunction()) return false; + + Object* data_obj = + constructor->shared()->get_api_func_data()->access_check_info(); + if (data_obj == heap_.undefined_value()) return false; + + Object* fun_obj = AccessCheckInfo::cast(data_obj)->indexed_callback(); + v8::IndexedSecurityCallback callback = + v8::ToCData<v8::IndexedSecurityCallback>(fun_obj); + + if (!callback) return false; + + HandleScope scope(this); + Handle<JSObject> receiver_handle(receiver, this); + Handle<Object> data(AccessCheckInfo::cast(data_obj)->data(), this); + LOG(this, ApiIndexedSecurityCheck(index)); + bool result = false; + { + // Leaving JavaScript. + VMState state(this, EXTERNAL); + result = callback(v8::Utils::ToLocal(receiver_handle), + index, + type, + v8::Utils::ToLocal(data)); + } + return result; +} + + +const char* const Isolate::kStackOverflowMessage = + "Uncaught RangeError: Maximum call stack size exceeded"; + + +Failure* Isolate::StackOverflow() { + HandleScope scope; + Handle<String> key = factory()->stack_overflow_symbol(); + Handle<JSObject> boilerplate = + Handle<JSObject>::cast(GetProperty(js_builtins_object(), key)); + Handle<Object> exception = Copy(boilerplate); + // TODO(1240995): To avoid having to call JavaScript code to compute + // the message for stack overflow exceptions which is very likely to + // double fault with another stack overflow exception, we use a + // precomputed message. + DoThrow(*exception, NULL); + return Failure::Exception(); +} + + +Failure* Isolate::TerminateExecution() { + DoThrow(heap_.termination_exception(), NULL); + return Failure::Exception(); +} + + +Failure* Isolate::Throw(Object* exception, MessageLocation* location) { + DoThrow(exception, location); + return Failure::Exception(); +} + + +Failure* Isolate::ReThrow(MaybeObject* exception, MessageLocation* location) { + bool can_be_caught_externally = false; + bool catchable_by_javascript = is_catchable_by_javascript(exception); + ShouldReportException(&can_be_caught_externally, catchable_by_javascript); + + thread_local_top()->catcher_ = can_be_caught_externally ? + try_catch_handler() : NULL; + + // Set the exception being re-thrown. + set_pending_exception(exception); + if (exception->IsFailure()) return exception->ToFailureUnchecked(); + return Failure::Exception(); +} + + +Failure* Isolate::ThrowIllegalOperation() { + return Throw(heap_.illegal_access_symbol()); +} + + +void Isolate::ScheduleThrow(Object* exception) { + // When scheduling a throw we first throw the exception to get the + // error reporting if it is uncaught before rescheduling it. + Throw(exception); + thread_local_top()->scheduled_exception_ = pending_exception(); + thread_local_top()->external_caught_exception_ = false; + clear_pending_exception(); +} + + +Failure* Isolate::PromoteScheduledException() { + MaybeObject* thrown = scheduled_exception(); + clear_scheduled_exception(); + // Re-throw the exception to avoid getting repeated error reporting. + return ReThrow(thrown); +} + + +void Isolate::PrintCurrentStackTrace(FILE* out) { + StackTraceFrameIterator it(this); + while (!it.done()) { + HandleScope scope; + // Find code position if recorded in relocation info. + JavaScriptFrame* frame = it.frame(); + int pos = frame->LookupCode()->SourcePosition(frame->pc()); + Handle<Object> pos_obj(Smi::FromInt(pos)); + // Fetch function and receiver. + Handle<JSFunction> fun(JSFunction::cast(frame->function())); + Handle<Object> recv(frame->receiver()); + // Advance to the next JavaScript frame and determine if the + // current frame is the top-level frame. + it.Advance(); + Handle<Object> is_top_level = it.done() + ? factory()->true_value() + : factory()->false_value(); + // Generate and print stack trace line. + Handle<String> line = + Execution::GetStackTraceLine(recv, fun, pos_obj, is_top_level); + if (line->length() > 0) { + line->PrintOn(out); + fprintf(out, "\n"); + } + } +} + + +void Isolate::ComputeLocation(MessageLocation* target) { + *target = MessageLocation(Handle<Script>(heap_.empty_script()), -1, -1); + StackTraceFrameIterator it(this); + if (!it.done()) { + JavaScriptFrame* frame = it.frame(); + JSFunction* fun = JSFunction::cast(frame->function()); + Object* script = fun->shared()->script(); + if (script->IsScript() && + !(Script::cast(script)->source()->IsUndefined())) { + int pos = frame->LookupCode()->SourcePosition(frame->pc()); + // Compute the location from the function and the reloc info. + Handle<Script> casted_script(Script::cast(script)); + *target = MessageLocation(casted_script, pos, pos + 1); + } + } +} + + +bool Isolate::ShouldReportException(bool* can_be_caught_externally, + bool catchable_by_javascript) { + // Find the top-most try-catch handler. + StackHandler* handler = + StackHandler::FromAddress(Isolate::handler(thread_local_top())); + while (handler != NULL && !handler->is_try_catch()) { + handler = handler->next(); + } + + // Get the address of the external handler so we can compare the address to + // determine which one is closer to the top of the stack. + Address external_handler_address = + thread_local_top()->try_catch_handler_address(); + + // The exception has been externally caught if and only if there is + // an external handler which is on top of the top-most try-catch + // handler. + *can_be_caught_externally = external_handler_address != NULL && + (handler == NULL || handler->address() > external_handler_address || + !catchable_by_javascript); + + if (*can_be_caught_externally) { + // Only report the exception if the external handler is verbose. + return try_catch_handler()->is_verbose_; + } else { + // Report the exception if it isn't caught by JavaScript code. + return handler == NULL; + } +} + + +void Isolate::DoThrow(MaybeObject* exception, MessageLocation* location) { + ASSERT(!has_pending_exception()); + + HandleScope scope; + Object* exception_object = Smi::FromInt(0); + bool is_object = exception->ToObject(&exception_object); + Handle<Object> exception_handle(exception_object); + + // Determine reporting and whether the exception is caught externally. + bool catchable_by_javascript = is_catchable_by_javascript(exception); + // Only real objects can be caught by JS. + ASSERT(!catchable_by_javascript || is_object); + bool can_be_caught_externally = false; + bool should_report_exception = + ShouldReportException(&can_be_caught_externally, catchable_by_javascript); + bool report_exception = catchable_by_javascript && should_report_exception; + +#ifdef ENABLE_DEBUGGER_SUPPORT + // Notify debugger of exception. + if (catchable_by_javascript) { + debugger_->OnException(exception_handle, report_exception); + } +#endif + + // Generate the message. + Handle<Object> message_obj; + MessageLocation potential_computed_location; + bool try_catch_needs_message = + can_be_caught_externally && + try_catch_handler()->capture_message_; + if (report_exception || try_catch_needs_message) { + if (location == NULL) { + // If no location was specified we use a computed one instead + ComputeLocation(&potential_computed_location); + location = &potential_computed_location; + } + if (!bootstrapper()->IsActive()) { + // It's not safe to try to make message objects or collect stack + // traces while the bootstrapper is active since the infrastructure + // may not have been properly initialized. + Handle<String> stack_trace; + if (FLAG_trace_exception) stack_trace = StackTraceString(); + Handle<JSArray> stack_trace_object; + if (report_exception && capture_stack_trace_for_uncaught_exceptions_) { + stack_trace_object = CaptureCurrentStackTrace( + stack_trace_for_uncaught_exceptions_frame_limit_, + stack_trace_for_uncaught_exceptions_options_); + } + ASSERT(is_object); // Can't use the handle unless there's a real object. + message_obj = MessageHandler::MakeMessageObject("uncaught_exception", + location, HandleVector<Object>(&exception_handle, 1), stack_trace, + stack_trace_object); + } else if (location != NULL && !location->script().is_null()) { + // We are bootstrapping and caught an error where the location is set + // and we have a script for the location. + // In this case we could have an extension (or an internal error + // somewhere) and we print out the line number at which the error occured + // to the console for easier debugging. + int line_number = GetScriptLineNumberSafe(location->script(), + location->start_pos()); + OS::PrintError("Extension or internal compilation error at line %d.\n", + line_number); + } + } + + // Save the message for reporting if the the exception remains uncaught. + thread_local_top()->has_pending_message_ = report_exception; + if (!message_obj.is_null()) { + thread_local_top()->pending_message_obj_ = *message_obj; + if (location != NULL) { + thread_local_top()->pending_message_script_ = *location->script(); + thread_local_top()->pending_message_start_pos_ = location->start_pos(); + thread_local_top()->pending_message_end_pos_ = location->end_pos(); + } + } + + // Do not forget to clean catcher_ if currently thrown exception cannot + // be caught. If necessary, ReThrow will update the catcher. + thread_local_top()->catcher_ = can_be_caught_externally ? + try_catch_handler() : NULL; + + // NOTE: Notifying the debugger or generating the message + // may have caused new exceptions. For now, we just ignore + // that and set the pending exception to the original one. + if (is_object) { + set_pending_exception(*exception_handle); + } else { + // Failures are not on the heap so they neither need nor work with handles. + ASSERT(exception_handle->IsFailure()); + set_pending_exception(exception); + } +} + + +bool Isolate::IsExternallyCaught() { + ASSERT(has_pending_exception()); + + if ((thread_local_top()->catcher_ == NULL) || + (try_catch_handler() != thread_local_top()->catcher_)) { + // When throwing the exception, we found no v8::TryCatch + // which should care about this exception. + return false; + } + + if (!is_catchable_by_javascript(pending_exception())) { + return true; + } + + // Get the address of the external handler so we can compare the address to + // determine which one is closer to the top of the stack. + Address external_handler_address = + thread_local_top()->try_catch_handler_address(); + ASSERT(external_handler_address != NULL); + + // The exception has been externally caught if and only if there is + // an external handler which is on top of the top-most try-finally + // handler. + // There should be no try-catch blocks as they would prohibit us from + // finding external catcher in the first place (see catcher_ check above). + // + // Note, that finally clause would rethrow an exception unless it's + // aborted by jumps in control flow like return, break, etc. and we'll + // have another chances to set proper v8::TryCatch. + StackHandler* handler = + StackHandler::FromAddress(Isolate::handler(thread_local_top())); + while (handler != NULL && handler->address() < external_handler_address) { + ASSERT(!handler->is_try_catch()); + if (handler->is_try_finally()) return false; + + handler = handler->next(); + } + + return true; +} + + +void Isolate::ReportPendingMessages() { + ASSERT(has_pending_exception()); + PropagatePendingExceptionToExternalTryCatch(); + + // If the pending exception is OutOfMemoryException set out_of_memory in + // the global context. Note: We have to mark the global context here + // since the GenerateThrowOutOfMemory stub cannot make a RuntimeCall to + // set it. + HandleScope scope; + if (thread_local_top_.pending_exception_ == Failure::OutOfMemoryException()) { + context()->mark_out_of_memory(); + } else if (thread_local_top_.pending_exception_ == + heap()->termination_exception()) { + // Do nothing: if needed, the exception has been already propagated to + // v8::TryCatch. + } else { + if (thread_local_top_.has_pending_message_) { + thread_local_top_.has_pending_message_ = false; + if (!thread_local_top_.pending_message_obj_->IsTheHole()) { + HandleScope scope; + Handle<Object> message_obj(thread_local_top_.pending_message_obj_); + if (thread_local_top_.pending_message_script_ != NULL) { + Handle<Script> script(thread_local_top_.pending_message_script_); + int start_pos = thread_local_top_.pending_message_start_pos_; + int end_pos = thread_local_top_.pending_message_end_pos_; + MessageLocation location(script, start_pos, end_pos); + MessageHandler::ReportMessage(this, &location, message_obj); + } else { + MessageHandler::ReportMessage(this, NULL, message_obj); + } + } + } + } + clear_pending_message(); +} + + +void Isolate::TraceException(bool flag) { + FLAG_trace_exception = flag; // TODO(isolates): This is an unfortunate use. +} + + +bool Isolate::OptionalRescheduleException(bool is_bottom_call) { + ASSERT(has_pending_exception()); + PropagatePendingExceptionToExternalTryCatch(); + + // Allways reschedule out of memory exceptions. + if (!is_out_of_memory()) { + bool is_termination_exception = + pending_exception() == heap_.termination_exception(); + + // Do not reschedule the exception if this is the bottom call. + bool clear_exception = is_bottom_call; + + if (is_termination_exception) { + if (is_bottom_call) { + thread_local_top()->external_caught_exception_ = false; + clear_pending_exception(); + return false; + } + } else if (thread_local_top()->external_caught_exception_) { + // If the exception is externally caught, clear it if there are no + // JavaScript frames on the way to the C++ frame that has the + // external handler. + ASSERT(thread_local_top()->try_catch_handler_address() != NULL); + Address external_handler_address = + thread_local_top()->try_catch_handler_address(); + JavaScriptFrameIterator it; + if (it.done() || (it.frame()->sp() > external_handler_address)) { + clear_exception = true; + } + } + + // Clear the exception if needed. + if (clear_exception) { + thread_local_top()->external_caught_exception_ = false; + clear_pending_exception(); + return false; + } + } + + // Reschedule the exception. + thread_local_top()->scheduled_exception_ = pending_exception(); + clear_pending_exception(); + return true; +} + + +void Isolate::SetCaptureStackTraceForUncaughtExceptions( + bool capture, + int frame_limit, + StackTrace::StackTraceOptions options) { + capture_stack_trace_for_uncaught_exceptions_ = capture; + stack_trace_for_uncaught_exceptions_frame_limit_ = frame_limit; + stack_trace_for_uncaught_exceptions_options_ = options; +} + + +bool Isolate::is_out_of_memory() { + if (has_pending_exception()) { + MaybeObject* e = pending_exception(); + if (e->IsFailure() && Failure::cast(e)->IsOutOfMemoryException()) { + return true; + } + } + if (has_scheduled_exception()) { + MaybeObject* e = scheduled_exception(); + if (e->IsFailure() && Failure::cast(e)->IsOutOfMemoryException()) { + return true; + } + } + return false; +} + + +Handle<Context> Isolate::global_context() { + GlobalObject* global = thread_local_top()->context_->global(); + return Handle<Context>(global->global_context()); +} + + +Handle<Context> Isolate::GetCallingGlobalContext() { + JavaScriptFrameIterator it; +#ifdef ENABLE_DEBUGGER_SUPPORT + if (debug_->InDebugger()) { + while (!it.done()) { + JavaScriptFrame* frame = it.frame(); + Context* context = Context::cast(frame->context()); + if (context->global_context() == *debug_->debug_context()) { + it.Advance(); + } else { + break; + } + } + } +#endif // ENABLE_DEBUGGER_SUPPORT + if (it.done()) return Handle<Context>::null(); + JavaScriptFrame* frame = it.frame(); + Context* context = Context::cast(frame->context()); + return Handle<Context>(context->global_context()); +} + + +char* Isolate::ArchiveThread(char* to) { + if (RuntimeProfiler::IsEnabled() && current_vm_state() == JS) { + RuntimeProfiler::IsolateExitedJS(this); + } + memcpy(to, reinterpret_cast<char*>(thread_local_top()), + sizeof(ThreadLocalTop)); + InitializeThreadLocal(); + clear_pending_exception(); + clear_pending_message(); + clear_scheduled_exception(); + return to + sizeof(ThreadLocalTop); +} + + +char* Isolate::RestoreThread(char* from) { + memcpy(reinterpret_cast<char*>(thread_local_top()), from, + sizeof(ThreadLocalTop)); + // This might be just paranoia, but it seems to be needed in case a + // thread_local_top_ is restored on a separate OS thread. +#ifdef USE_SIMULATOR +#ifdef V8_TARGET_ARCH_ARM + thread_local_top()->simulator_ = Simulator::current(this); +#elif V8_TARGET_ARCH_MIPS + thread_local_top()->simulator_ = Simulator::current(this); +#endif +#endif + if (RuntimeProfiler::IsEnabled() && current_vm_state() == JS) { + RuntimeProfiler::IsolateEnteredJS(this); + } + ASSERT(context() == NULL || context()->IsContext()); + return from + sizeof(ThreadLocalTop); +} + + +Isolate::ThreadDataTable::ThreadDataTable() + : list_(NULL) { +} + + +Isolate::PerIsolateThreadData* + Isolate::ThreadDataTable::Lookup(Isolate* isolate, + ThreadId thread_id) { + for (PerIsolateThreadData* data = list_; data != NULL; data = data->next_) { + if (data->Matches(isolate, thread_id)) return data; + } + return NULL; +} + + +void Isolate::ThreadDataTable::Insert(Isolate::PerIsolateThreadData* data) { + if (list_ != NULL) list_->prev_ = data; + data->next_ = list_; + list_ = data; +} + + +void Isolate::ThreadDataTable::Remove(PerIsolateThreadData* data) { + if (list_ == data) list_ = data->next_; + if (data->next_ != NULL) data->next_->prev_ = data->prev_; + if (data->prev_ != NULL) data->prev_->next_ = data->next_; + delete data; +} + + +void Isolate::ThreadDataTable::Remove(Isolate* isolate, + ThreadId thread_id) { + PerIsolateThreadData* data = Lookup(isolate, thread_id); + if (data != NULL) { + Remove(data); + } +} + + +void Isolate::ThreadDataTable::RemoveAllThreads(Isolate* isolate) { + PerIsolateThreadData* data = list_; + while (data != NULL) { + PerIsolateThreadData* next = data->next_; + if (data->isolate() == isolate) Remove(data); + data = next; + } +} + + +#ifdef DEBUG +#define TRACE_ISOLATE(tag) \ + do { \ + if (FLAG_trace_isolates) { \ + PrintF("Isolate %p " #tag "\n", reinterpret_cast<void*>(this)); \ + } \ + } while (false) +#else +#define TRACE_ISOLATE(tag) +#endif + + +Isolate::Isolate() + : state_(UNINITIALIZED), + entry_stack_(NULL), + stack_trace_nesting_level_(0), + incomplete_message_(NULL), + preallocated_memory_thread_(NULL), + preallocated_message_space_(NULL), + bootstrapper_(NULL), + runtime_profiler_(NULL), + compilation_cache_(NULL), + counters_(NULL), + code_range_(NULL), + // Must be initialized early to allow v8::SetResourceConstraints calls. + break_access_(OS::CreateMutex()), + debugger_initialized_(false), + // Must be initialized early to allow v8::Debug calls. + debugger_access_(OS::CreateMutex()), + logger_(NULL), + stats_table_(NULL), + stub_cache_(NULL), + deoptimizer_data_(NULL), + capture_stack_trace_for_uncaught_exceptions_(false), + stack_trace_for_uncaught_exceptions_frame_limit_(0), + stack_trace_for_uncaught_exceptions_options_(StackTrace::kOverview), + transcendental_cache_(NULL), + memory_allocator_(NULL), + keyed_lookup_cache_(NULL), + context_slot_cache_(NULL), + descriptor_lookup_cache_(NULL), + handle_scope_implementer_(NULL), + unicode_cache_(NULL), + in_use_list_(0), + free_list_(0), + preallocated_storage_preallocated_(false), + inner_pointer_to_code_cache_(NULL), + write_input_buffer_(NULL), + global_handles_(NULL), + context_switcher_(NULL), + thread_manager_(NULL), + fp_stubs_generated_(false), + string_tracker_(NULL), + regexp_stack_(NULL), + embedder_data_(NULL) { + TRACE_ISOLATE(constructor); + + memset(isolate_addresses_, 0, + sizeof(isolate_addresses_[0]) * (kIsolateAddressCount + 1)); + + heap_.isolate_ = this; + zone_.isolate_ = this; + stack_guard_.isolate_ = this; + + // ThreadManager is initialized early to support locking an isolate + // before it is entered. + thread_manager_ = new ThreadManager(); + thread_manager_->isolate_ = this; + +#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \ + defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__) + simulator_initialized_ = false; + simulator_i_cache_ = NULL; + simulator_redirection_ = NULL; +#endif + +#ifdef DEBUG + // heap_histograms_ initializes itself. + memset(&js_spill_information_, 0, sizeof(js_spill_information_)); + memset(code_kind_statistics_, 0, + sizeof(code_kind_statistics_[0]) * Code::NUMBER_OF_KINDS); +#endif + +#ifdef ENABLE_DEBUGGER_SUPPORT + debug_ = NULL; + debugger_ = NULL; +#endif + + handle_scope_data_.Initialize(); + +#define ISOLATE_INIT_EXECUTE(type, name, initial_value) \ + name##_ = (initial_value); + ISOLATE_INIT_LIST(ISOLATE_INIT_EXECUTE) +#undef ISOLATE_INIT_EXECUTE + +#define ISOLATE_INIT_ARRAY_EXECUTE(type, name, length) \ + memset(name##_, 0, sizeof(type) * length); + ISOLATE_INIT_ARRAY_LIST(ISOLATE_INIT_ARRAY_EXECUTE) +#undef ISOLATE_INIT_ARRAY_EXECUTE +} + +void Isolate::TearDown() { + TRACE_ISOLATE(tear_down); + + // Temporarily set this isolate as current so that various parts of + // the isolate can access it in their destructors without having a + // direct pointer. We don't use Enter/Exit here to avoid + // initializing the thread data. + PerIsolateThreadData* saved_data = CurrentPerIsolateThreadData(); + Isolate* saved_isolate = UncheckedCurrent(); + SetIsolateThreadLocals(this, NULL); + + Deinit(); + + { ScopedLock lock(process_wide_mutex_); + thread_data_table_->RemoveAllThreads(this); + } + + if (!IsDefaultIsolate()) { + delete this; + } + + // Restore the previous current isolate. + SetIsolateThreadLocals(saved_isolate, saved_data); +} + + +void Isolate::Deinit() { + if (state_ == INITIALIZED) { + TRACE_ISOLATE(deinit); + + if (FLAG_hydrogen_stats) HStatistics::Instance()->Print(); + + // We must stop the logger before we tear down other components. + logger_->EnsureTickerStopped(); + + delete deoptimizer_data_; + deoptimizer_data_ = NULL; + if (FLAG_preemption) { + v8::Locker locker; + v8::Locker::StopPreemption(); + } + builtins_.TearDown(); + bootstrapper_->TearDown(); + + // Remove the external reference to the preallocated stack memory. + delete preallocated_message_space_; + preallocated_message_space_ = NULL; + PreallocatedMemoryThreadStop(); + + HeapProfiler::TearDown(); + CpuProfiler::TearDown(); + if (runtime_profiler_ != NULL) { + runtime_profiler_->TearDown(); + delete runtime_profiler_; + runtime_profiler_ = NULL; + } + heap_.TearDown(); + logger_->TearDown(); + + // The default isolate is re-initializable due to legacy API. + state_ = UNINITIALIZED; + } +} + + +void Isolate::SetIsolateThreadLocals(Isolate* isolate, + PerIsolateThreadData* data) { + Thread::SetThreadLocal(isolate_key_, isolate); + Thread::SetThreadLocal(per_isolate_thread_data_key_, data); +} + + +Isolate::~Isolate() { + TRACE_ISOLATE(destructor); + + // Has to be called while counters_ are still alive. + zone_.DeleteKeptSegment(); + + delete[] assembler_spare_buffer_; + assembler_spare_buffer_ = NULL; + + delete unicode_cache_; + unicode_cache_ = NULL; + + delete regexp_stack_; + regexp_stack_ = NULL; + + delete descriptor_lookup_cache_; + descriptor_lookup_cache_ = NULL; + delete context_slot_cache_; + context_slot_cache_ = NULL; + delete keyed_lookup_cache_; + keyed_lookup_cache_ = NULL; + + delete transcendental_cache_; + transcendental_cache_ = NULL; + delete stub_cache_; + stub_cache_ = NULL; + delete stats_table_; + stats_table_ = NULL; + + delete logger_; + logger_ = NULL; + + delete counters_; + counters_ = NULL; + + delete handle_scope_implementer_; + handle_scope_implementer_ = NULL; + delete break_access_; + break_access_ = NULL; + delete debugger_access_; + debugger_access_ = NULL; + + delete compilation_cache_; + compilation_cache_ = NULL; + delete bootstrapper_; + bootstrapper_ = NULL; + delete inner_pointer_to_code_cache_; + inner_pointer_to_code_cache_ = NULL; + delete write_input_buffer_; + write_input_buffer_ = NULL; + + delete context_switcher_; + context_switcher_ = NULL; + delete thread_manager_; + thread_manager_ = NULL; + + delete string_tracker_; + string_tracker_ = NULL; + + delete memory_allocator_; + memory_allocator_ = NULL; + delete code_range_; + code_range_ = NULL; + delete global_handles_; + global_handles_ = NULL; + + delete external_reference_table_; + external_reference_table_ = NULL; + +#ifdef ENABLE_DEBUGGER_SUPPORT + delete debugger_; + debugger_ = NULL; + delete debug_; + debug_ = NULL; +#endif +} + + +void Isolate::InitializeThreadLocal() { + thread_local_top_.isolate_ = this; + thread_local_top_.Initialize(); +} + + +void Isolate::PropagatePendingExceptionToExternalTryCatch() { + ASSERT(has_pending_exception()); + + bool external_caught = IsExternallyCaught(); + thread_local_top_.external_caught_exception_ = external_caught; + + if (!external_caught) return; + + if (thread_local_top_.pending_exception_ == Failure::OutOfMemoryException()) { + // Do not propagate OOM exception: we should kill VM asap. + } else if (thread_local_top_.pending_exception_ == + heap()->termination_exception()) { + try_catch_handler()->can_continue_ = false; + try_catch_handler()->exception_ = heap()->null_value(); + } else { + // At this point all non-object (failure) exceptions have + // been dealt with so this shouldn't fail. + ASSERT(!pending_exception()->IsFailure()); + try_catch_handler()->can_continue_ = true; + try_catch_handler()->exception_ = pending_exception(); + if (!thread_local_top_.pending_message_obj_->IsTheHole()) { + try_catch_handler()->message_ = thread_local_top_.pending_message_obj_; + } + } +} + + +void Isolate::InitializeLoggingAndCounters() { + if (logger_ == NULL) { + logger_ = new Logger; + } + if (counters_ == NULL) { + counters_ = new Counters; + } +} + + +void Isolate::InitializeDebugger() { +#ifdef ENABLE_DEBUGGER_SUPPORT + ScopedLock lock(debugger_access_); + if (NoBarrier_Load(&debugger_initialized_)) return; + InitializeLoggingAndCounters(); + debug_ = new Debug(this); + debugger_ = new Debugger(this); + Release_Store(&debugger_initialized_, true); +#endif +} + + +bool Isolate::Init(Deserializer* des) { + ASSERT(state_ != INITIALIZED); + ASSERT(Isolate::Current() == this); + TRACE_ISOLATE(init); + +#ifdef DEBUG + // The initialization process does not handle memory exhaustion. + DisallowAllocationFailure disallow_allocation_failure; +#endif + + InitializeLoggingAndCounters(); + + InitializeDebugger(); + + memory_allocator_ = new MemoryAllocator(this); + code_range_ = new CodeRange(this); + + // Safe after setting Heap::isolate_, initializing StackGuard and + // ensuring that Isolate::Current() == this. + heap_.SetStackLimits(); + +#define ASSIGN_ELEMENT(CamelName, hacker_name) \ + isolate_addresses_[Isolate::k##CamelName##Address] = \ + reinterpret_cast<Address>(hacker_name##_address()); + FOR_EACH_ISOLATE_ADDRESS_NAME(ASSIGN_ELEMENT) +#undef C + + string_tracker_ = new StringTracker(); + string_tracker_->isolate_ = this; + compilation_cache_ = new CompilationCache(this); + transcendental_cache_ = new TranscendentalCache(); + keyed_lookup_cache_ = new KeyedLookupCache(); + context_slot_cache_ = new ContextSlotCache(); + descriptor_lookup_cache_ = new DescriptorLookupCache(); + unicode_cache_ = new UnicodeCache(); + inner_pointer_to_code_cache_ = new InnerPointerToCodeCache(this); + write_input_buffer_ = new StringInputBuffer(); + global_handles_ = new GlobalHandles(this); + bootstrapper_ = new Bootstrapper(); + handle_scope_implementer_ = new HandleScopeImplementer(this); + stub_cache_ = new StubCache(this); + regexp_stack_ = new RegExpStack(); + regexp_stack_->isolate_ = this; + + // Enable logging before setting up the heap + logger_->Setup(); + + CpuProfiler::Setup(); + HeapProfiler::Setup(); + + // Initialize other runtime facilities +#if defined(USE_SIMULATOR) +#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS) + Simulator::Initialize(this); +#endif +#endif + + { // NOLINT + // Ensure that the thread has a valid stack guard. The v8::Locker object + // will ensure this too, but we don't have to use lockers if we are only + // using one thread. + ExecutionAccess lock(this); + stack_guard_.InitThread(lock); + } + + // Setup the object heap. + const bool create_heap_objects = (des == NULL); + ASSERT(!heap_.HasBeenSetup()); + if (!heap_.Setup(create_heap_objects)) { + V8::SetFatalError(); + return false; + } + + InitializeThreadLocal(); + + bootstrapper_->Initialize(create_heap_objects); + builtins_.Setup(create_heap_objects); + + // Only preallocate on the first initialization. + if (FLAG_preallocate_message_memory && preallocated_message_space_ == NULL) { + // Start the thread which will set aside some memory. + PreallocatedMemoryThreadStart(); + preallocated_message_space_ = + new NoAllocationStringAllocator( + preallocated_memory_thread_->data(), + preallocated_memory_thread_->length()); + PreallocatedStorageInit(preallocated_memory_thread_->length() / 4); + } + + if (FLAG_preemption) { + v8::Locker locker; + v8::Locker::StartPreemption(100); + } + +#ifdef ENABLE_DEBUGGER_SUPPORT + debug_->Setup(create_heap_objects); +#endif + stub_cache_->Initialize(create_heap_objects); + + // If we are deserializing, read the state into the now-empty heap. + if (des != NULL) { + des->Deserialize(); + stub_cache_->Initialize(true); + } + + // Finish initialization of ThreadLocal after deserialization is done. + clear_pending_exception(); + clear_pending_message(); + clear_scheduled_exception(); + + // Deserializing may put strange things in the root array's copy of the + // stack guard. + heap_.SetStackLimits(); + + deoptimizer_data_ = new DeoptimizerData; + runtime_profiler_ = new RuntimeProfiler(this); + runtime_profiler_->Setup(); + + // If we are deserializing, log non-function code objects and compiled + // functions found in the snapshot. + if (des != NULL && (FLAG_log_code || FLAG_ll_prof)) { + HandleScope scope; + LOG(this, LogCodeObjects()); + LOG(this, LogCompiledFunctions()); + } + + state_ = INITIALIZED; + return true; +} + + +// Initialized lazily to allow early +// v8::V8::SetAddHistogramSampleFunction calls. +StatsTable* Isolate::stats_table() { + if (stats_table_ == NULL) { + stats_table_ = new StatsTable; + } + return stats_table_; +} + + +void Isolate::Enter() { + Isolate* current_isolate = NULL; + PerIsolateThreadData* current_data = CurrentPerIsolateThreadData(); + if (current_data != NULL) { + current_isolate = current_data->isolate_; + ASSERT(current_isolate != NULL); + if (current_isolate == this) { + ASSERT(Current() == this); + ASSERT(entry_stack_ != NULL); + ASSERT(entry_stack_->previous_thread_data == NULL || + entry_stack_->previous_thread_data->thread_id().Equals( + ThreadId::Current())); + // Same thread re-enters the isolate, no need to re-init anything. + entry_stack_->entry_count++; + return; + } + } + + // Threads can have default isolate set into TLS as Current but not yet have + // PerIsolateThreadData for it, as it requires more advanced phase of the + // initialization. For example, a thread might be the one that system used for + // static initializers - in this case the default isolate is set in TLS but + // the thread did not yet Enter the isolate. If PerisolateThreadData is not + // there, use the isolate set in TLS. + if (current_isolate == NULL) { + current_isolate = Isolate::UncheckedCurrent(); + } + + PerIsolateThreadData* data = FindOrAllocatePerThreadDataForThisThread(); + ASSERT(data != NULL); + ASSERT(data->isolate_ == this); + + EntryStackItem* item = new EntryStackItem(current_data, + current_isolate, + entry_stack_); + entry_stack_ = item; + + SetIsolateThreadLocals(this, data); + + // In case it's the first time some thread enters the isolate. + set_thread_id(data->thread_id()); +} + + +void Isolate::Exit() { + ASSERT(entry_stack_ != NULL); + ASSERT(entry_stack_->previous_thread_data == NULL || + entry_stack_->previous_thread_data->thread_id().Equals( + ThreadId::Current())); + + if (--entry_stack_->entry_count > 0) return; + + ASSERT(CurrentPerIsolateThreadData() != NULL); + ASSERT(CurrentPerIsolateThreadData()->isolate_ == this); + + // Pop the stack. + EntryStackItem* item = entry_stack_; + entry_stack_ = item->previous_item; + + PerIsolateThreadData* previous_thread_data = item->previous_thread_data; + Isolate* previous_isolate = item->previous_isolate; + + delete item; + + // Reinit the current thread for the isolate it was running before this one. + SetIsolateThreadLocals(previous_isolate, previous_thread_data); +} + + +#ifdef DEBUG +#define ISOLATE_FIELD_OFFSET(type, name, ignored) \ +const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_); +ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET) +ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET) +#undef ISOLATE_FIELD_OFFSET +#endif + +} } // namespace v8::internal |