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 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 #ifndef SHARE_VM_RUNTIME_VFRAMEARRAY_HPP

 #define SHARE_VM_RUNTIME_VFRAMEARRAY_HPP

 #include "oops/arrayOop.hpp"

 #include "runtime/deoptimization.hpp"

 #include "runtime/frame.inline.hpp"

 #include "runtime/monitorChunk.hpp"

 #include "utilities/growableArray.hpp"

 // A vframeArray is an array used for momentarily storing off stack Java method activations

 // during deoptimization. Essentially it is an array of vframes where each vframe

 // data is stored off stack. This structure will never exist across a safepoint so

 // there is no need to gc any oops that are stored in the structure.

 class LocalsClosure;

 class ExpressionStackClosure;

 class MonitorStackClosure;

 class MonitorArrayElement;

 class StackValueCollection;

 // A vframeArrayElement is an element of a vframeArray. Each element

 // represent an interpreter frame which will eventually be created.

 class vframeArrayElement : public _ValueObj {

   private:

     frame _frame;                                                // the interpreter frame we will unpack into

     int  _bci;                                                   // raw bci for this vframe

     bool _reexecute;                                             // whether sould we reexecute this bytecode

     methodOop  _method;                                          // the method for this vframe

     MonitorChunk* _monitors;                                     // active monitors for this vframe

     StackValueCollection* _locals;

     StackValueCollection* _expressions;

   public:

   frame* iframe(void)                { return &_frame; }

   int bci(void) const;

   int raw_bci(void) const            { return _bci; }

   bool should_reexecute(void) const  { return _reexecute; }

   methodOop method(void) const       { return _method; }

   MonitorChunk* monitors(void) const { return _monitors; }

   void free_monitors(JavaThread* jt);

   StackValueCollection* locals(void) const             { return _locals; }

   StackValueCollection* expressions(void) const        { return _expressions; }

   void fill_in(compiledVFrame* vf);

   // Formerly part of deoptimizedVFrame

   // Returns the on stack word size for this frame

   // callee_parameters is the number of callee locals residing inside this frame

   int on_stack_size(int callee_parameters,

                     int callee_locals,

                     bool is_top_frame,

                     int popframe_extra_stack_expression_els) const;

   // Unpacks the element to skeletal interpreter frame

   void unpack_on_stack(int callee_parameters,

                        int callee_locals,

                        frame* caller,

                        bool is_top_frame,

                        int exec_mode);

 #ifndef PRODUCT

   void print(outputStream* st);

 #endif /* PRODUCT */

 };

 // this can be a ResourceObj if we don't save the last one...

 // but it does make debugging easier even if we can't look

 // at the data in each vframeElement

 class vframeArray: public CHeapObj {

  private:

   // Here is what a vframeArray looks like in memory

   /*

       fixed part

         description of the original frame

         _frames - number of vframes in this array

         adapter info

         callee register save area

       variable part

         vframeArrayElement   [ 0 ]

         ...

         vframeArrayElement   [_frames - 1]

   */

   JavaThread*                  _owner_thread;

   vframeArray*                 _next;

   frame                        _original;          // the original frame of the deoptee

   frame                        _caller;            // caller of root frame in vframeArray

   frame                        _sender;

   Deoptimization::UnrollBlock* _unroll_block;

   int                          _frame_size;

   int                          _frames; // number of javavframes in the array (does not count any adapter)

   intptr_t                     _callee_registers[RegisterMap::reg_count];

   unsigned char                _valid[RegisterMap::reg_count];

   vframeArrayElement           _elements[1];   // First variable section.

   void fill_in_element(int index, compiledVFrame* vf);

   bool is_location_valid(int i) const        { return _valid[i] != 0; }

   void set_location_valid(int i, bool valid) { _valid[i] = valid; }

  public:

   // Tells whether index is within bounds.

   bool is_within_bounds(int index) const        { return 0 <= index && index < frames(); }

   // Accessores for instance variable

   int frames() const                            { return _frames;   }

   static vframeArray* allocate(JavaThread* thread, int frame_size, GrowableArray<compiledVFrame*>* chunk,

                                RegisterMap* reg_map, frame sender, frame caller, frame self);

   vframeArrayElement* element(int index)        { assert(is_within_bounds(index), "Bad index"); return &_elements[index]; }

   // Allocates a new vframe in the array and fills the array with vframe information in chunk

   void fill_in(JavaThread* thread, int frame_size, GrowableArray<compiledVFrame*>* chunk, const RegisterMap *reg_map);

   // Returns the owner of this vframeArray

   JavaThread* owner_thread() const           { return _owner_thread; }

   // Accessors for next

   vframeArray* next() const                  { return _next; }

   void set_next(vframeArray* value)          { _next = value; }

   // Accessors for sp

   intptr_t* sp() const                       { return _original.sp(); }

   intptr_t* unextended_sp() const            { return _original.unextended_sp(); }

   address original_pc() const                { return _original.pc(); }

   frame original() const                     { return _original; }

   frame caller() const                       { return _caller; }

   frame sender() const                       { return _sender; }

   // Accessors for unroll block

   Deoptimization::UnrollBlock* unroll_block() const         { return _unroll_block; }

   void set_unroll_block(Deoptimization::UnrollBlock* block) { _unroll_block = block; }

   // Returns the size of the frame that got deoptimized

   int frame_size() const { return _frame_size; }

   // Unpack the array on the stack passed in stack interval

   void unpack_to_stack(frame &unpack_frame, int exec_mode);

   // Deallocates monitor chunks allocated during deoptimization.

   // This should be called when the array is not used anymore.

   void deallocate_monitor_chunks();

   // Accessor for register map

   address register_location(int i) const;

   void print_on_2(outputStream* st) PRODUCT_RETURN;

   void print_value_on(outputStream* st) const PRODUCT_RETURN;

 #ifndef PRODUCT

   // Comparing

   bool structural_compare(JavaThread* thread, GrowableArray<compiledVFrame*>* chunk);

 #endif

 };

 #endif // SHARE_VM_RUNTIME_VFRAMEARRAY_HPP