Updated VM stacktrace support (20898) with strndup impl.

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 244 matching lines @@
   uword saved_stack_limit() const { return saved_stack_limit_; }
 
   static uword GetSpecifiedStackSize();
 
   static const intptr_t kStackSizeBuffer = (4 * KB * kWordSize);
 
   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,
+        kStoreBufferInterrupt |
+        kVmStatusInterrupt,
   };
 
   void ScheduleInterrupts(uword interrupt_bits);
   uword GetAndClearInterrupts();
 
   MessageHandler* message_handler() const { return message_handler_; }
   void set_message_handler(MessageHandler* value) { message_handler_ = value; }
 
   uword spawn_data() const { return spawn_data_; }
   void set_spawn_data(uword value) { spawn_data_ = value; }
@@ skipping 33 matching lines @@
     return create_callback_;
   }
 
   static void SetInterruptCallback(Dart_IsolateInterruptCallback cb) {
     interrupt_callback_ = cb;
   }
   static Dart_IsolateInterruptCallback InterruptCallback() {
     return interrupt_callback_;
   }
 
+  static void SetVmStatsCallback(Dart_IsolateInterruptCallback cb) {
+    vmstats_callback_ = cb;
+  }
+  static Dart_IsolateInterruptCallback VmStatsCallback() {
+    return vmstats_callback_;
+  }
+
   static void SetUnhandledExceptionCallback(
       Dart_IsolateUnhandledExceptionCallback cb) {
     unhandled_exception_callback_ = cb;
   }
   static Dart_IsolateUnhandledExceptionCallback UnhandledExceptionCallback() {
     return unhandled_exception_callback_;
   }
 
   static void SetShutdownCallback(Dart_IsolateShutdownCallback cb) {
     shutdown_callback_ = cb;
@@ skipping 79 matching lines @@
   }
 
   static char* GetStatus(const char* request);
 
  private:
   Isolate();
 
   void BuildName(const char* name_prefix);
   void PrintInvokedFunctions();
 
+  static bool FetchStacktrace();
+  static bool FetchStackFrameDetails();
+  char* GetStatusDetails();
+  char* GetStatusStacktrace();
+  char* GetStatusStackFrame(intptr_t index);
+  char* DoStacktraceInterrupt(Dart_IsolateInterruptCallback cb);
+
   static ThreadLocalKey isolate_key;
   StoreBufferBlock store_buffer_block_;
   StoreBuffer store_buffer_;
   ClassTable class_table_;
   MegamorphicCacheTable megamorphic_cache_table_;
   Dart_MessageNotifyCallback message_notify_callback_;
   char* name_;
   int64_t start_time_;
   Dart_Port main_port_;
   Heap* heap_;
@@ skipping 18 matching lines @@
   GcPrologueCallbacks gc_prologue_callbacks_;
   GcEpilogueCallbacks gc_epilogue_callbacks_;
 
   // Deoptimization support.
   intptr_t* deopt_cpu_registers_copy_;
   fpu_register_t* deopt_fpu_registers_copy_;
   intptr_t* deopt_frame_copy_;
   intptr_t deopt_frame_copy_size_;
   DeferredObject* deferred_objects_;
 
+  // Status support.
+  char* stacktrace_;
+  intptr_t stack_frame_index_;
+
   static Dart_IsolateCreateCallback create_callback_;
   static Dart_IsolateInterruptCallback interrupt_callback_;
   static Dart_IsolateUnhandledExceptionCallback unhandled_exception_callback_;
   static Dart_IsolateShutdownCallback shutdown_callback_;
   static Dart_FileOpenCallback file_open_callback_;
   static Dart_FileWriteCallback file_write_callback_;
   static Dart_FileCloseCallback file_close_callback_;
+  static Dart_IsolateInterruptCallback vmstats_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(Isolate);
 };
 
 // When we need to execute code in an isolate, we use the
 // StartIsolateScope.
 class StartIsolateScope {
  public:
   explicit StartIsolateScope(Isolate* new_isolate)
       : new_isolate_(new_isolate), saved_isolate_(Isolate::Current()) {
@@ skipping 51 matching lines @@
   Isolate* new_isolate_;
   Isolate* saved_isolate_;
   uword saved_stack_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(SwitchIsolateScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_