Implement new stacktrace and deoptimization stress testing flags:

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/thread.h"
@@ skipping 208 matching lines @@
     return reinterpret_cast<uword>(&stack_limit_);
   }
 
   // The current stack limit.  This may be overwritten with a special
   // value to trigger interrupts.
   uword stack_limit() const { return stack_limit_; }
 
   // The true stack limit for this isolate.
   uword saved_stack_limit() const { return saved_stack_limit_; }
 
+  // Stack overflow flags
+  enum {
+    kOsrRequest = 0x1,  // Current stack overflow caused by OSR request.
+  };
+
+  uword stack_overflow_flags_address() const {
+    return reinterpret_cast<uword>(&stack_overflow_flags_);
+  }
+
+  int32_t IncrementAndGetStackOverflowCount() {
+    return ++stack_overflow_count_;
+  }
+
+  // Retrieves and clears the stack overflow flags.  These are set by
+  // the generated code before the slow path runtime routine for a
+  // stack overflow is called.
+  uword GetAndClearStackOverflowFlags();
+
   // Retrieve the stack address bounds.
   bool GetStackBounds(uword* lower, uword* upper);
 
   static uword GetSpecifiedStackSize();
 
   static const intptr_t kStackSizeBuffer = (4 * KB * kWordSize);
 
+  // Interrupt bits.
   enum {
     kApiInterrupt = 0x1,      // An interrupt from Dart_InterruptIsolate.
     kMessageInterrupt = 0x2,  // An interrupt to process an out of band message.
     kStoreBufferInterrupt = 0x4,  // An interrupt to process the store buffer.
     kVmStatusInterrupt = 0x8,     // An interrupt to process a status request.
 
     kInterruptsMask =
         kApiInterrupt |
         kMessageInterrupt |
         kStoreBufferInterrupt |
@@ skipping 257 matching lines @@
   Debugger* debugger_;
   bool single_step_;
   Random random_;
   Simulator* simulator_;
   LongJumpScope* long_jump_base_;
   TimerList timer_list_;
   intptr_t deopt_id_;
   Mutex* mutex_;  // protects stack_limit_ and saved_stack_limit_.
   uword stack_limit_;
   uword saved_stack_limit_;
+  uword stack_overflow_flags_;
+  int32_t stack_overflow_count_;
   MessageHandler* message_handler_;
   IsolateSpawnState* spawn_state_;
   bool is_runnable_;
   Dart_GcPrologueCallback gc_prologue_callback_;
   Dart_GcEpilogueCallback gc_epilogue_callback_;
   intptr_t defer_finalization_count_;
   DeoptContext* deopt_context_;
 
   // Status support.
   char* stacktrace_;
@@ skipping 144 matching lines @@
   char* script_url_;
   char* library_url_;
   char* class_name_;
   char* function_name_;
   char* exception_callback_name_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_