/* * Copyright 1997-2009 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 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* 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* 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* chunk); #endif };