- Move

runtime/vm/thread.h

 // Copyright (c) 2015, 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_THREAD_H_
 #define VM_THREAD_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 127 matching lines @@
   // "helper" to gain limited concurrent access to the isolate. One example is
   // SweeperTask (which uses the class table, which is copy-on-write).
   // TODO(koda): Properly synchronize heap access to expand allowed operations.
   static bool EnterIsolateAsHelper(Isolate* isolate,
                                    bool bypass_safepoint = false);
   static void ExitIsolateAsHelper(bool bypass_safepoint = false);
 
   // Empties the store buffer block into the isolate.
   void PrepareForGC();
 
+  void SetStackLimit(uword value);
+  void SetStackLimitFromStackBase(uword stack_base);
+  void ClearStackLimit();
+
+  // Returns the current C++ stack pointer. Equivalent taking the address of a
+  // stack allocated local, but plays well with AddressSanitizer.
+  static uword GetCurrentStackPointer();
+
+  // Access to the current stack limit for generated code.  This may be
+  // overwritten with a special value to trigger interrupts.
+  uword stack_limit_address() const {
+    return reinterpret_cast<uword>(&stack_limit_);
+  }
+  static intptr_t stack_limit_offset() {
+    return OFFSET_OF(Thread, 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_);
+  }
+  static intptr_t stack_overflow_flags_offset() {
+    return OFFSET_OF(Thread, 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();
+
+  // Interrupt bits.
+  enum {
+    kVMInterrupt = 0x1,  // Internal VM checks: safepoints, store buffers, etc.
+    kMessageInterrupt = 0x2,  // An interrupt to process an out of band message.
+
+    kInterruptsMask = (kVMInterrupt | kMessageInterrupt),
+  };
+
+  void ScheduleInterrupts(uword interrupt_bits);
+  void ScheduleInterruptsLocked(uword interrupt_bits);
+  RawError* HandleInterrupts();
+  uword GetAndClearInterrupts();
+
   // OSThread corresponding to this thread.
   OSThread* os_thread() const { return os_thread_; }
   void set_os_thread(OSThread* os_thread) {
     os_thread_ = os_thread;
   }
 
   // Monitor corresponding to this thread.
   Monitor* thread_lock() const { return thread_lock_; }
 
   // The topmost zone used for allocation in this thread.
@@ skipping 368 matching lines @@
   bool IsValidLocalHandle(Dart_Handle object) const;
   int CountLocalHandles() const;
   int ZoneSizeInBytes() const;
   void UnwindScopes(uword stack_marker);
 
   void InitVMConstants();
 
  private:
   template<class T> T* AllocateReusableHandle();
 
+  // Accessed from generated code:
+  uword stack_limit_;
+  uword stack_overflow_flags_;
+  Isolate* isolate_;
+  Heap* heap_;
+  uword top_exit_frame_info_;
+  StoreBufferBlock* store_buffer_block_;
+  uword vm_tag_;
+  // State that is cached in the TLS for fast access in generated code.
+#define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value)      \
+  type_name member_name;
+CACHED_CONSTANTS_LIST(DECLARE_MEMBERS)
+#undef DECLARE_MEMBERS
+
+#define DECLARE_MEMBERS(name)      \
+  uword name##_entry_point_;
+RUNTIME_ENTRY_LIST(DECLARE_MEMBERS)
+#undef DECLARE_MEMBERS
+
+#define DECLARE_MEMBERS(returntype, name, ...)      \
+  uword name##_entry_point_;
+LEAF_RUNTIME_ENTRY_LIST(DECLARE_MEMBERS)
+#undef DECLARE_MEMBERS
+
   OSThread* os_thread_;
   Monitor* thread_lock_;
-  Isolate* isolate_;
-  Heap* heap_;
   Zone* zone_;
   ApiLocalScope* api_reusable_scope_;
   ApiLocalScope* api_top_scope_;
-  uword top_exit_frame_info_;
   StackResource* top_resource_;
   LongJumpScope* long_jump_base_;
-  StoreBufferBlock* store_buffer_block_;
   int32_t no_callback_scope_depth_;
 #if defined(DEBUG)
   HandleScope* top_handle_scope_;
   int32_t no_handle_scope_depth_;
   int32_t no_safepoint_scope_depth_;
 #endif
   VMHandles reusable_handles_;
+  uword saved_stack_limit_;
+  uint16_t deferred_interrupts_mask_;
+  uint16_t deferred_interrupts_;
+  int32_t stack_overflow_count_;
 
   // Compiler state:
   CHA* cha_;
   intptr_t deopt_id_;  // Compilation specific counter.
-  uword vm_tag_;
   RawGrowableObjectArray* pending_functions_;
 
   RawError* sticky_error_;
 
-  // State that is cached in the TLS for fast access in generated code.
-#define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value)      \
-  type_name member_name;
-CACHED_CONSTANTS_LIST(DECLARE_MEMBERS)
-#undef DECLARE_MEMBERS
-
-#define DECLARE_MEMBERS(name)      \
-  uword name##_entry_point_;
-RUNTIME_ENTRY_LIST(DECLARE_MEMBERS)
-#undef DECLARE_MEMBERS
-
-#define DECLARE_MEMBERS(returntype, name, ...)      \
-  uword name##_entry_point_;
-LEAF_RUNTIME_ENTRY_LIST(DECLARE_MEMBERS)
-#undef DECLARE_MEMBERS
-
   // Reusable handles support.
 #define REUSABLE_HANDLE_FIELDS(object)                                         \
   object* object##_handle_;
   REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_FIELDS)
 #undef REUSABLE_HANDLE_FIELDS
 
 #if defined(DEBUG)
 #define REUSABLE_HANDLE_SCOPE_VARIABLE(object)                                 \
   bool reusable_##object##_handle_scope_active_;
   REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_SCOPE_VARIABLE);
@@ skipping 26 matching lines @@
     safepoint_state_ = value;
   }
   void EnterSafepointUsingLock();
   void ExitSafepointUsingLock();
   void BlockForSafepoint();
 
   static void SetCurrent(Thread* current) {
     OSThread::SetCurrentTLS(reinterpret_cast<uword>(current));
   }
 
+  void DeferOOBMessageInterrupts();
+  void RestoreOOBMessageInterrupts();
+
 #define REUSABLE_FRIEND_DECLARATION(name)                                      \
   friend class Reusable##name##HandleScope;
 REUSABLE_HANDLE_LIST(REUSABLE_FRIEND_DECLARATION)
 #undef REUSABLE_FRIEND_DECLARATION
 
   friend class ApiZone;
+  friend class InterruptChecker;
   friend class Isolate;
+  friend class IsolateTestHelper;
+  friend class NoOOBMessageScope;
   friend class Simulator;
   friend class StackZone;
   friend class ThreadRegistry;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 
 #if defined(TARGET_OS_WINDOWS)
 // Clears the state of the current thread and frees the allocation.
 void WindowsThreadCleanUp();
 #endif
 
 
 // Disable thread interrupts.
 class DisableThreadInterruptsScope : public StackResource {
  public:
   explicit DisableThreadInterruptsScope(Thread* thread);
   ~DisableThreadInterruptsScope();
 };
 
 }  // namespace dart
 
 #endif  // VM_THREAD_H_