1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // A vframeArray is an array used for momentarily storing off stack Java method activations
26 // during deoptimization. Essentially it is an array of vframes where each vframe
27 // data is stored off stack. This structure will never exist across a safepoint so
28 // there is no need to gc any oops that are stored in the structure.
29
30
31 class LocalsClosure;
32 class ExpressionStackClosure;
33 class MonitorStackClosure;
34 class MonitorArrayElement;
35 class StackValueCollection;
36
37 // A vframeArrayElement is an element of a vframeArray. Each element
38 // represent an interpreter frame which will eventually be created.
39
40 class vframeArrayElement : public _ValueObj {
41 private:
42
43 frame _frame; // the interpreter frame we will unpack into
44 int _bci; // raw bci for this vframe
45 methodOop _method; // the method for this vframe
46 MonitorChunk* _monitors; // active monitors for this vframe
47 StackValueCollection* _locals;
48 StackValueCollection* _expressions;
49
50 public:
51
52 frame* iframe(void) { return &_frame; }
53
54 int bci(void) const;
55
56 int raw_bci(void) const { return _bci; }
57
58 methodOop method(void) const { return _method; }
59
60 MonitorChunk* monitors(void) const { return _monitors; }
61
62 void free_monitors(JavaThread* jt);
63
64 StackValueCollection* locals(void) const { return _locals; }
65
66 StackValueCollection* expressions(void) const { return _expressions; }
67
68 void fill_in(compiledVFrame* vf);
69
70 // Formerly part of deoptimizedVFrame
71
72
73 // Returns the on stack word size for this frame
74 // callee_parameters is the number of callee locals residing inside this frame
75 int on_stack_size(int callee_parameters,
76 int callee_locals,
77 bool is_top_frame,
78 int popframe_extra_stack_expression_els) const;
79
80 // Unpacks the element to skeletal interpreter frame
81 void unpack_on_stack(int callee_parameters,
82 int callee_locals,
83 frame* caller,
84 bool is_top_frame,
85 int exec_mode);
86
87 #ifndef PRODUCT
88 void print(outputStream* st);
89 #endif /* PRODUCT */
90 };
91
92 // this can be a ResourceObj if we don't save the last one...
93 // but it does make debugging easier even if we can't look
94 // at the data in each vframeElement
95
96 class vframeArray: public CHeapObj {
97 private:
98
99
100 // Here is what a vframeArray looks like in memory
101
102 /*
103 fixed part
104 description of the original frame
105 _frames - number of vframes in this array
106 adapter info
107 callee register save area
108 variable part
109 vframeArrayElement [ 0 ]
110 ...
111 vframeArrayElement [_frames - 1]
112
113 */
114
115 JavaThread* _owner_thread;
116 vframeArray* _next;
117 frame _original; // the original frame of the deoptee
118 frame _caller; // caller of root frame in vframeArray
119 frame _sender;
120
121 Deoptimization::UnrollBlock* _unroll_block;
122 int _frame_size;
123
124 int _frames; // number of javavframes in the array (does not count any adapter)
125
126 intptr_t _callee_registers[RegisterMap::reg_count];
127 unsigned char _valid[RegisterMap::reg_count];
128
129 vframeArrayElement _elements[1]; // First variable section.
130
131 void fill_in_element(int index, compiledVFrame* vf);
132
133 bool is_location_valid(int i) const { return _valid[i] != 0; }
134 void set_location_valid(int i, bool valid) { _valid[i] = valid; }
135
136 public:
137
138
139 // Tells whether index is within bounds.
140 bool is_within_bounds(int index) const { return 0 <= index && index < frames(); }
141
142 // Accessores for instance variable
143 int frames() const { return _frames; }
144
145 static vframeArray* allocate(JavaThread* thread, int frame_size, GrowableArray<compiledVFrame*>* chunk,
146 RegisterMap* reg_map, frame sender, frame caller, frame self);
147
148
149 vframeArrayElement* element(int index) { assert(is_within_bounds(index), "Bad index"); return &_elements[index]; }
150
151 // Allocates a new vframe in the array and fills the array with vframe information in chunk
152 void fill_in(JavaThread* thread, int frame_size, GrowableArray<compiledVFrame*>* chunk, const RegisterMap *reg_map);
153
154 // Returns the owner of this vframeArray
155 JavaThread* owner_thread() const { return _owner_thread; }
156
157 // Accessors for next
158 vframeArray* next() const { return _next; }
159 void set_next(vframeArray* value) { _next = value; }
160
161 // Accessors for sp
162 intptr_t* sp() const { return _original.sp(); }
163
164 intptr_t* unextended_sp() const { return _original.unextended_sp(); }
165
166 address original_pc() const { return _original.pc(); }
167
168 frame original() const { return _original; }
169
170 frame caller() const { return _caller; }
171
172 frame sender() const { return _sender; }
173
174 // Accessors for unroll block
175 Deoptimization::UnrollBlock* unroll_block() const { return _unroll_block; }
176 void set_unroll_block(Deoptimization::UnrollBlock* block) { _unroll_block = block; }
177
178 // Returns the size of the frame that got deoptimized
179 int frame_size() const { return _frame_size; }
180
181 // Unpack the array on the stack passed in stack interval
182 void unpack_to_stack(frame &unpack_frame, int exec_mode);
183
184 // Deallocates monitor chunks allocated during deoptimization.
185 // This should be called when the array is not used anymore.
186 void deallocate_monitor_chunks();
187
188
189
190 // Accessor for register map
191 address register_location(int i) const;
192
193 void print_on_2(outputStream* st) PRODUCT_RETURN;
194 void print_value_on(outputStream* st) const PRODUCT_RETURN;
195
196 #ifndef PRODUCT
197 // Comparing
198 bool structural_compare(JavaThread* thread, GrowableArray<compiledVFrame*>* chunk);
199 #endif
200
201 };