Implement new stacktrace and deoptimization stress testing flags:

runtime/vm/isolate.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "lib/mirrors.h"
@@ skipping 303 matching lines @@
       debugger_(NULL),
       single_step_(false),
       random_(),
       simulator_(NULL),
       long_jump_base_(NULL),
       timer_list_(),
       deopt_id_(0),
       mutex_(new Mutex()),
       stack_limit_(0),
       saved_stack_limit_(0),
+      stack_overflow_flags_(0),
+      stack_overflow_count_(0),
       message_handler_(NULL),
       spawn_state_(NULL),
       is_runnable_(false),
       gc_prologue_callback_(NULL),
       gc_epilogue_callback_(NULL),
       defer_finalization_count_(0),
       deopt_context_(NULL),
       stacktrace_(NULL),
       stack_frame_index_(-1),
       cha_used_(false),
@@ skipping 321 matching lines @@
   MutexLocker ml(mutex_);
   if (stack_limit_ == saved_stack_limit_) {
     return 0;  // No interrupt was requested.
   }
   uword interrupt_bits = stack_limit_ & kInterruptsMask;
   stack_limit_ = saved_stack_limit_;
   return interrupt_bits;
 }
 
 
+uword Isolate::GetAndClearStackOverflowFlags() {
+  uword stack_overflow_flags = stack_overflow_flags_;
+  stack_overflow_flags_ = 0;
+  return stack_overflow_flags;
+}
+
+
 static int MostUsedFunctionFirst(const Function* const* a,
                                  const Function* const* b) {
   if ((*a)->usage_counter() > (*b)->usage_counter()) {
     return -1;
   } else if ((*a)->usage_counter() < (*b)->usage_counter()) {
     return 1;
   } else {
     return 0;
   }
 }
@@ skipping 449 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(isolate());
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart