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--- old/src/share/vm/runtime/deoptimization.hpp
+++ new/src/share/vm/runtime/deoptimization.hpp
1 1 /*
2 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #ifndef SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP
26 26 #define SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP
27 27
28 28 #include "memory/allocation.hpp"
29 29 #include "runtime/frame.inline.hpp"
30 30
31 31 class ProfileData;
32 32 class vframeArray;
33 33 class MonitorValue;
34 34 class ObjectValue;
35 35
36 36 class Deoptimization : AllStatic {
37 37 public:
38 38 // What condition caused the deoptimization?
39 39 enum DeoptReason {
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40 40 Reason_many = -1, // indicates presence of several reasons
41 41 Reason_none = 0, // indicates absence of a relevant deopt.
42 42 // Next 7 reasons are recorded per bytecode in DataLayout::trap_bits
43 43 Reason_null_check, // saw unexpected null or zero divisor (@bci)
44 44 Reason_null_assert, // saw unexpected non-null or non-zero (@bci)
45 45 Reason_range_check, // saw unexpected array index (@bci)
46 46 Reason_class_check, // saw unexpected object class (@bci)
47 47 Reason_array_check, // saw unexpected array class (aastore @bci)
48 48 Reason_intrinsic, // saw unexpected operand to intrinsic (@bci)
49 49 Reason_bimorphic, // saw unexpected object class in bimorphic inlining (@bci)
50 + Reason_unhandled, // arbitrary compiler limitation
51 +
50 52
51 53 Reason_unloaded, // unloaded class or constant pool entry
52 54 Reason_uninitialized, // bad class state (uninitialized)
53 55 Reason_unreached, // code is not reached, compiler
54 - Reason_unhandled, // arbitrary compiler limitation
55 56 Reason_constraint, // arbitrary runtime constraint violated
56 57 Reason_div0_check, // a null_check due to division by zero
57 58 Reason_age, // nmethod too old; tier threshold reached
58 59 Reason_predicate, // compiler generated predicate failed
59 60 Reason_loop_limit_check, // compiler generated loop limits check failed
60 61 Reason_LIMIT,
61 62 // Note: Keep this enum in sync. with _trap_reason_name.
62 - Reason_RECORDED_LIMIT = Reason_bimorphic // some are not recorded per bc
63 - // Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of
63 + Reason_RECORDED_LIMIT = Reason_unhandled // some are not recorded per bc
64 + // Note: Reason_RECORDED_LIMIT should be < 16 to fit into 4 bits of
64 65 // DataLayout::trap_bits. This dependency is enforced indirectly
65 66 // via asserts, to avoid excessive direct header-to-header dependencies.
66 67 // See Deoptimization::trap_state_reason and class DataLayout.
67 68 };
68 69
69 70 // What action must be taken by the runtime?
70 71 enum DeoptAction {
71 72 Action_none, // just interpret, do not invalidate nmethod
72 73 Action_maybe_recompile, // recompile the nmethod; need not invalidate
73 74 Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile
74 75 Action_make_not_entrant, // invalidate the nmethod, recompile (probably)
75 76 Action_make_not_compilable, // invalidate the nmethod and do not compile
76 77 Action_LIMIT
77 78 // Note: Keep this enum in sync. with _trap_action_name.
78 79 };
79 80
80 81 enum {
81 82 _action_bits = 3,
82 83 _reason_bits = 5,
83 84 _action_shift = 0,
84 85 _reason_shift = _action_shift+_action_bits,
85 86 BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist
86 87 };
87 88
88 89 enum UnpackType {
89 90 Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack
90 91 Unpack_exception = 1, // exception is pending
91 92 Unpack_uncommon_trap = 2, // redo last byte code (C2 only)
92 93 Unpack_reexecute = 3 // reexecute bytecode (C1 only)
93 94 };
94 95
95 96 // Checks all compiled methods. Invalid methods are deleted and
96 97 // corresponding activations are deoptimized.
97 98 static int deoptimize_dependents();
98 99
99 100 // Deoptimizes a frame lazily. nmethod gets patched deopt happens on return to the frame
100 101 static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map);
101 102
102 103 private:
103 104 // Does the actual work for deoptimizing a single frame
104 105 static void deoptimize_single_frame(JavaThread* thread, frame fr);
105 106
106 107 // Helper function to revoke biases of all monitors in frame if UseBiasedLocking
107 108 // is enabled
108 109 static void revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map);
109 110 // Helper function to revoke biases of all monitors in frames
110 111 // executing in a particular CodeBlob if UseBiasedLocking is enabled
111 112 static void revoke_biases_of_monitors(CodeBlob* cb);
112 113
113 114 #ifdef COMPILER2
114 115 // Support for restoring non-escaping objects
115 116 static bool realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS);
116 117 static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type);
117 118 static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj);
118 119 static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects);
119 120 static void relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread);
120 121 NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects);)
121 122 #endif // COMPILER2
122 123
123 124 public:
124 125 static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk);
125 126
126 127 // Interface used for unpacking deoptimized frames
127 128
128 129 // UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob).
129 130 // This is only a CheapObj to ease debugging after a deopt failure
130 131 class UnrollBlock : public CHeapObj {
131 132 private:
132 133 int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame
133 134 int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame
134 135 int _number_of_frames; // Number frames to unroll
135 136 int _total_frame_sizes; // Total of number*sizes frames
136 137 intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack
137 138 address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack
138 139 intptr_t* _register_block; // Block for storing callee-saved registers.
139 140 BasicType _return_type; // Tells if we have to restore double or long return value
140 141 intptr_t _initial_fp; // FP of the sender frame
141 142 int _caller_actual_parameters; // The number of actual arguments at the
142 143 // interpreted caller of the deoptimized frame
143 144
144 145 // The following fields are used as temps during the unpacking phase
145 146 // (which is tight on registers, especially on x86). They really ought
146 147 // to be PD variables but that involves moving this class into its own
147 148 // file to use the pd include mechanism. Maybe in a later cleanup ...
148 149 intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp)
149 150 intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind)
150 151 intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp)
151 152 public:
152 153 // Constructor
153 154 UnrollBlock(int size_of_deoptimized_frame,
154 155 int caller_adjustment,
155 156 int caller_actual_parameters,
156 157 int number_of_frames,
157 158 intptr_t* frame_sizes,
158 159 address* frames_pcs,
159 160 BasicType return_type);
160 161 ~UnrollBlock();
161 162
162 163 // Returns where a register is located.
163 164 intptr_t* value_addr_at(int register_number) const;
164 165
165 166 // Accessors
166 167 intptr_t* frame_sizes() const { return _frame_sizes; }
167 168 int number_of_frames() const { return _number_of_frames; }
168 169 address* frame_pcs() const { return _frame_pcs ; }
169 170
170 171 // Returns the total size of frames
171 172 int size_of_frames() const;
172 173
173 174 void set_initial_fp(intptr_t fp) { _initial_fp = fp; }
174 175
175 176 int caller_actual_parameters() const { return _caller_actual_parameters; }
176 177
177 178 // Accessors used by the code generator for the unpack stub.
178 179 static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); }
179 180 static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); }
180 181 static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); }
181 182 static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); }
182 183 static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); }
183 184 static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); }
184 185 static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); }
185 186 static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); }
186 187 static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); }
187 188 static int initial_fp_offset_in_bytes() { return offset_of(UnrollBlock, _initial_fp); }
188 189 static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); }
189 190 static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); }
190 191
191 192 BasicType return_type() const { return _return_type; }
192 193 void print();
193 194 };
194 195
195 196 //** Returns an UnrollBlock continuing information
196 197 // how to make room for the resulting interpreter frames.
197 198 // Called by assembly stub after execution has returned to
198 199 // deoptimized frame.
199 200 // @argument thread. Thread where stub_frame resides.
200 201 // @see OptoRuntime::deoptimization_fetch_unroll_info_C
201 202 static UnrollBlock* fetch_unroll_info(JavaThread* thread);
202 203
203 204 //** Unpacks vframeArray onto execution stack
204 205 // Called by assembly stub after execution has returned to
205 206 // deoptimized frame and after the stack unrolling.
206 207 // @argument thread. Thread where stub_frame resides.
207 208 // @argument exec_mode. Determines how execution should be continuted in top frame.
208 209 // 0 means continue after current byte code
209 210 // 1 means exception has happened, handle exception
210 211 // 2 means reexecute current bytecode (for uncommon traps).
211 212 // @see OptoRuntime::deoptimization_unpack_frames_C
212 213 // Return BasicType of call return type, if any
213 214 static BasicType unpack_frames(JavaThread* thread, int exec_mode);
214 215
215 216 // Cleans up deoptimization bits on thread after unpacking or in the
216 217 // case of an exception.
217 218 static void cleanup_deopt_info(JavaThread *thread,
218 219 vframeArray * array);
219 220
220 221 // Restores callee saved values from deoptimized frame into oldest interpreter frame
221 222 // so caller of the deoptimized frame will get back the values it expects.
222 223 static void unwind_callee_save_values(frame* f, vframeArray* vframe_array);
223 224
224 225 //** Performs an uncommon trap for compiled code.
225 226 // The top most compiler frame is converted into interpreter frames
226 227 static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index);
227 228 // Helper routine that enters the VM and may block
228 229 static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index);
229 230
230 231 //** Deoptimizes the frame identified by id.
231 232 // Only called from VMDeoptimizeFrame
232 233 // @argument thread. Thread where stub_frame resides.
233 234 // @argument id. id of frame that should be deoptimized.
234 235 static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id);
235 236
236 237 // If thread is not the current thread then execute
237 238 // VM_DeoptimizeFrame otherwise deoptimize directly.
238 239 static void deoptimize_frame(JavaThread* thread, intptr_t* id);
239 240
240 241 // Statistics
241 242 static void gather_statistics(DeoptReason reason, DeoptAction action,
242 243 Bytecodes::Code bc = Bytecodes::_illegal);
243 244 static void print_statistics();
244 245
245 246 // How much room to adjust the last frame's SP by, to make space for
246 247 // the callee's interpreter frame (which expects locals to be next to
247 248 // incoming arguments)
248 249 static int last_frame_adjust(int callee_parameters, int callee_locals);
249 250
250 251 // trap_request codes
251 252 static DeoptReason trap_request_reason(int trap_request) {
252 253 if (trap_request < 0)
253 254 return (DeoptReason)
254 255 ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits));
255 256 else
256 257 // standard reason for unloaded CP entry
257 258 return Reason_unloaded;
258 259 }
259 260 static DeoptAction trap_request_action(int trap_request) {
260 261 if (trap_request < 0)
261 262 return (DeoptAction)
262 263 ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits));
263 264 else
264 265 // standard action for unloaded CP entry
265 266 return _unloaded_action;
266 267 }
267 268 static int trap_request_index(int trap_request) {
268 269 if (trap_request < 0)
269 270 return -1;
270 271 else
271 272 return trap_request;
272 273 }
273 274 static int make_trap_request(DeoptReason reason, DeoptAction action,
274 275 int index = -1) {
275 276 assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits");
276 277 assert((1 << _action_bits) >= Action_LIMIT, "enough bits");
277 278 int trap_request;
278 279 if (index != -1)
279 280 trap_request = index;
280 281 else
281 282 trap_request = (~(((reason) << _reason_shift)
282 283 + ((action) << _action_shift)));
283 284 assert(reason == trap_request_reason(trap_request), "valid reason");
284 285 assert(action == trap_request_action(trap_request), "valid action");
285 286 assert(index == trap_request_index(trap_request), "valid index");
286 287 return trap_request;
287 288 }
288 289
289 290 // The trap_state stored in a MDO is decoded here.
290 291 // It records two items of information.
291 292 // reason: If a deoptimization happened here, what its reason was,
292 293 // or if there were multiple deopts with differing reasons.
293 294 // recompiled: If a deoptimization here triggered a recompilation.
294 295 // Note that not all reasons are recorded per-bci.
295 296 static DeoptReason trap_state_reason(int trap_state);
296 297 static int trap_state_has_reason(int trap_state, int reason);
297 298 static int trap_state_add_reason(int trap_state, int reason);
298 299 static bool trap_state_is_recompiled(int trap_state);
299 300 static int trap_state_set_recompiled(int trap_state, bool z);
300 301 static const char* format_trap_state(char* buf, size_t buflen,
301 302 int trap_state);
302 303
303 304 static bool reason_is_recorded_per_bytecode(DeoptReason reason) {
304 305 return reason > Reason_none && reason <= Reason_RECORDED_LIMIT;
305 306 }
306 307
307 308 static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) {
308 309 if (reason_is_recorded_per_bytecode(reason))
309 310 return reason;
310 311 else if (reason == Reason_div0_check) // null check due to divide-by-zero?
311 312 return Reason_null_check; // recorded per BCI as a null check
312 313 else
313 314 return Reason_none;
314 315 }
315 316
316 317 static const char* trap_reason_name(int reason);
317 318 static const char* trap_action_name(int action);
318 319 // Format like reason='foo' action='bar' index='123'.
319 320 // This is suitable both for XML and for tty output.
320 321 static const char* format_trap_request(char* buf, size_t buflen,
321 322 int trap_request);
322 323
323 324 static jint total_deoptimization_count();
324 325 static jint deoptimization_count(DeoptReason reason);
325 326
326 327 // JVMTI PopFrame support
327 328
328 329 // Preserves incoming arguments to the popped frame when it is
329 330 // returning to a deoptimized caller
330 331 static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address);
331 332
332 333 private:
333 334 static methodDataOop get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing);
334 335 // Update the mdo's count and per-BCI reason bits, returning previous state:
335 336 static ProfileData* query_update_method_data(methodDataHandle trap_mdo,
336 337 int trap_bci,
337 338 DeoptReason reason,
338 339 //outputs:
339 340 uint& ret_this_trap_count,
340 341 bool& ret_maybe_prior_trap,
341 342 bool& ret_maybe_prior_recompile);
342 343 // class loading support for uncommon trap
343 344 static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS);
344 345 static void load_class_by_index(constantPoolHandle constant_pool, int index);
345 346
346 347 static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread);
347 348
348 349 static DeoptAction _unloaded_action; // == Action_reinterpret;
349 350 static const char* _trap_reason_name[Reason_LIMIT];
350 351 static const char* _trap_action_name[Action_LIMIT];
351 352
352 353 static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT];
353 354 // Note: Histogram array size is 1-2 Kb.
354 355
355 356 public:
356 357 static void update_method_data_from_interpreter(methodDataHandle trap_mdo, int trap_bci, int reason);
357 358 };
358 359
359 360 class DeoptimizationMarker : StackObj { // for profiling
360 361 static bool _is_active;
361 362 public:
362 363 DeoptimizationMarker() { _is_active = true; }
363 364 ~DeoptimizationMarker() { _is_active = false; }
364 365 static bool is_active() { return _is_active; }
365 366 };
366 367
367 368 #endif // SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP
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