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hotspot/src/share/vm/runtime/vframeArray.hpp

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+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// 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
+    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; }
+
+  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
+
+};