Version 3.3.7
Updated MIPS infrastructure files.
Performance improvements and bug fixes on all platforms.
git-svn-id: http://v8.googlecode.com/svn/trunk@7897 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/src/isolate.cc b/src/isolate.cc
index 4871702..9fac06a 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -40,6 +40,7 @@
#include "isolate.h"
#include "lithium-allocator.h"
#include "log.h"
+#include "messages.h"
#include "regexp-stack.h"
#include "runtime-profiler.h"
#include "scanner.h"
@@ -49,6 +50,7 @@
#include "spaces.h"
#include "stub-cache.h"
#include "version.h"
+#include "vm-state-inl.h"
namespace v8 {
@@ -61,6 +63,7 @@
return new_id;
}
+
int ThreadId::GetCurrentThreadId() {
int thread_id = Thread::GetThreadLocalInt(Isolate::thread_id_key_);
if (thread_id == 0) {
@@ -70,6 +73,53 @@
return thread_id;
}
+
+ThreadLocalTop::ThreadLocalTop() {
+ InitializeInternal();
+}
+
+
+void ThreadLocalTop::InitializeInternal() {
+ c_entry_fp_ = 0;
+ handler_ = 0;
+#ifdef USE_SIMULATOR
+ simulator_ = NULL;
+#endif
+#ifdef ENABLE_LOGGING_AND_PROFILING
+ js_entry_sp_ = NULL;
+ external_callback_ = NULL;
+#endif
+#ifdef ENABLE_VMSTATE_TRACKING
+ current_vm_state_ = EXTERNAL;
+#endif
+ 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;
+}
+
+
+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).
@@ -372,6 +422,890 @@
}
+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);
+ }
+}
+
+
+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();
+ 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;
+ ShouldReportException(&can_be_caught_externally,
+ is_catchable_by_javascript(exception));
+ thread_local_top()->catcher_ = can_be_caught_externally ?
+ try_catch_handler() : NULL;
+
+ // Set the exception being re-thrown.
+ set_pending_exception(exception);
+ 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);
+ }
+ }
+
+ // 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();
+ 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);
+ }
+ return from + sizeof(ThreadLocalTop);
+}
+
+
Isolate::ThreadDataTable::ThreadDataTable()
: list_(NULL) {
}