Isolates cleanup: move top.cc to isolate.cc.

src/top.cc

Index: src/top.cc
diff --git a/src/top.cc b/src/top.cc
deleted file mode 100644
index 6d68231351a2ed66d168a0d56f8c3e5cf1ba40c9..0000000000000000000000000000000000000000
--- a/src/top.cc
+++ /dev/null
@@ -1,977 +0,0 @@
-// Copyright 2006-2008 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 "v8.h"
-
-#include "api.h"
-#include "bootstrapper.h"
-#include "compiler.h"
-#include "debug.h"
-#include "execution.h"
-#include "messages.h"
-#include "platform.h"
-#include "simulator.h"
-#include "string-stream.h"
-#include "vm-state-inl.h"
-
-
-// TODO(isolates): move to isolate.cc. This stuff is kept here to
-// simplify merging.
-
-namespace v8 {
-namespace internal {
-
-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());
-}
-
-
-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);
-}
-
-} }  // namespace v8::internal