Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.hpp @ 5343:20c14eb46238
added GraalOptions.CheckcastMinHintHitProbability to better guide use of hints for checkcasts
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 02 May 2012 17:09:00 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP |
26 #define SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "runtime/frame.inline.hpp" | |
30 | |
0 | 31 class ProfileData; |
32 class vframeArray; | |
33 class MonitorValue; | |
34 class ObjectValue; | |
35 | |
36 class Deoptimization : AllStatic { | |
3939 | 37 friend class VMStructs; |
38 | |
0 | 39 public: |
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40 // What condition caused the deoptimization |
0 | 41 enum DeoptReason { |
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42 #ifdef GRAAL |
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43 Reason_many = -1, // indicates presence of several reasons |
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44 Reason_none = 0, // indicates absence of a relevant deopt. |
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45 // Next 7 reasons are recorded per bytecode in DataLayout::trap_bits. |
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46 // This is more complicated for Graal as Graal may deoptimize to *some* bytecode before the |
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47 // bytecode that actually caused the deopt (with inlining, Graal may even deoptimize to a |
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48 // bytecode in another method): |
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49 // - bytecode y in method b() causes deopt |
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50 // - Graal deoptimizes to bytecode x in method a() |
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51 // -> the deopt reason will be recorded for method a() at bytecode x |
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52 Reason_null_check, |
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53 Reason_range_check, |
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54 Reason_class_check, |
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55 Reason_array_check, |
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56 Reason_unreached, |
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57 Reason_type_checked_inlining, |
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58 Reason_optimized_type_check, |
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59 |
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60 // recorded per method |
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61 Reason_not_compiled_exception_handler, |
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62 Reason_unresolved, |
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63 Reason_jsr_mismatch, |
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64 Reason_div0_check, |
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65 Reason_constraint, |
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66 Reason_LIMIT, |
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67 Reason_RECORDED_LIMIT = Reason_optimized_type_check |
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68 #else |
0 | 69 Reason_many = -1, // indicates presence of several reasons |
70 Reason_none = 0, // indicates absence of a relevant deopt. | |
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71 // Next 7 reasons are recorded per bytecode in DataLayout::trap_bits |
0 | 72 Reason_null_check, // saw unexpected null or zero divisor (@bci) |
73 Reason_null_assert, // saw unexpected non-null or non-zero (@bci) | |
74 Reason_range_check, // saw unexpected array index (@bci) | |
75 Reason_class_check, // saw unexpected object class (@bci) | |
76 Reason_array_check, // saw unexpected array class (aastore @bci) | |
77 Reason_intrinsic, // saw unexpected operand to intrinsic (@bci) | |
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78 Reason_bimorphic, // saw unexpected object class in bimorphic inlining (@bci) |
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79 |
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80 Reason_unloaded, // unloaded or class constant pool entry |
0 | 81 Reason_uninitialized, // bad class state (uninitialized) |
82 Reason_unreached, // code is not reached, compiler | |
83 Reason_unhandled, // arbitrary compiler limitation | |
84 Reason_constraint, // arbitrary runtime constraint violated | |
85 Reason_div0_check, // a null_check due to division by zero | |
86 Reason_age, // nmethod too old; tier threshold reached | |
1172 | 87 Reason_predicate, // compiler generated predicate failed |
3345 | 88 Reason_loop_limit_check, // compiler generated loop limits check failed |
0 | 89 Reason_LIMIT, |
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90 Reason_RECORDED_LIMIT = Reason_bimorphic // some are not recorded per bc |
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91 #endif |
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92 // Note: Keep this enum in sync. with _trap_reason_name. |
0 | 93 // Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of |
94 // DataLayout::trap_bits. This dependency is enforced indirectly | |
95 // via asserts, to avoid excessive direct header-to-header dependencies. | |
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96 // See Deoptimization::trap_state_reason and class DataLayout |
0 | 97 }; |
98 | |
99 // What action must be taken by the runtime? | |
100 enum DeoptAction { | |
101 Action_none, // just interpret, do not invalidate nmethod | |
102 Action_maybe_recompile, // recompile the nmethod; need not invalidate | |
103 Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile | |
104 Action_make_not_entrant, // invalidate the nmethod, recompile (probably) | |
105 Action_make_not_compilable, // invalidate the nmethod and do not compile | |
106 Action_LIMIT | |
107 // Note: Keep this enum in sync. with _trap_action_name. | |
108 }; | |
109 | |
110 enum { | |
111 _action_bits = 3, | |
3345 | 112 _reason_bits = 5, |
0 | 113 _action_shift = 0, |
114 _reason_shift = _action_shift+_action_bits, | |
115 BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist | |
116 }; | |
117 | |
118 enum UnpackType { | |
119 Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack | |
120 Unpack_exception = 1, // exception is pending | |
121 Unpack_uncommon_trap = 2, // redo last byte code (C2 only) | |
122 Unpack_reexecute = 3 // reexecute bytecode (C1 only) | |
123 }; | |
124 | |
125 // Checks all compiled methods. Invalid methods are deleted and | |
126 // corresponding activations are deoptimized. | |
127 static int deoptimize_dependents(); | |
128 | |
129 // Deoptimizes a frame lazily. nmethod gets patched deopt happens on return to the frame | |
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130 static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map, DeoptReason reason); |
0 | 131 |
132 private: | |
133 // Does the actual work for deoptimizing a single frame | |
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134 static void deoptimize_single_frame(JavaThread* thread, frame fr, DeoptReason reason); |
0 | 135 |
136 // Helper function to revoke biases of all monitors in frame if UseBiasedLocking | |
137 // is enabled | |
138 static void revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map); | |
139 // Helper function to revoke biases of all monitors in frames | |
140 // executing in a particular CodeBlob if UseBiasedLocking is enabled | |
141 static void revoke_biases_of_monitors(CodeBlob* cb); | |
142 | |
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143 //#ifdef COMPILER2 |
0 | 144 // Support for restoring non-escaping objects |
145 static bool realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS); | |
146 static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type); | |
147 static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj); | |
148 static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects); | |
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149 static void relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread); |
0 | 150 NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects);) |
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151 //#endif // COMPILER2 |
0 | 152 |
153 public: | |
154 static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk); | |
155 | |
156 // Interface used for unpacking deoptimized frames | |
157 | |
158 // UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob). | |
159 // This is only a CheapObj to ease debugging after a deopt failure | |
160 class UnrollBlock : public CHeapObj { | |
161 private: | |
162 int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame | |
163 int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame | |
164 int _number_of_frames; // Number frames to unroll | |
165 int _total_frame_sizes; // Total of number*sizes frames | |
166 intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack | |
167 address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack | |
168 intptr_t* _register_block; // Block for storing callee-saved registers. | |
169 BasicType _return_type; // Tells if we have to restore double or long return value | |
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170 intptr_t _initial_info; // Platform dependent data for the sender frame (was FP on x86) |
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171 int _caller_actual_parameters; // The number of actual arguments at the |
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172 // interpreted caller of the deoptimized frame |
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173 |
0 | 174 // The following fields are used as temps during the unpacking phase |
175 // (which is tight on registers, especially on x86). They really ought | |
176 // to be PD variables but that involves moving this class into its own | |
177 // file to use the pd include mechanism. Maybe in a later cleanup ... | |
178 intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp) | |
179 intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind) | |
180 intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp) | |
181 public: | |
182 // Constructor | |
183 UnrollBlock(int size_of_deoptimized_frame, | |
184 int caller_adjustment, | |
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185 int caller_actual_parameters, |
0 | 186 int number_of_frames, |
187 intptr_t* frame_sizes, | |
188 address* frames_pcs, | |
189 BasicType return_type); | |
190 ~UnrollBlock(); | |
191 | |
192 // Returns where a register is located. | |
193 intptr_t* value_addr_at(int register_number) const; | |
194 | |
195 // Accessors | |
196 intptr_t* frame_sizes() const { return _frame_sizes; } | |
197 int number_of_frames() const { return _number_of_frames; } | |
198 address* frame_pcs() const { return _frame_pcs ; } | |
199 | |
200 // Returns the total size of frames | |
201 int size_of_frames() const; | |
202 | |
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203 void set_initial_info(intptr_t info) { _initial_info = info; } |
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204 |
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205 int caller_actual_parameters() const { return _caller_actual_parameters; } |
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206 |
0 | 207 // Accessors used by the code generator for the unpack stub. |
208 static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); } | |
209 static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); } | |
210 static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); } | |
211 static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); } | |
212 static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); } | |
213 static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); } | |
214 static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); } | |
215 static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); } | |
216 static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); } | |
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217 static int initial_info_offset_in_bytes() { return offset_of(UnrollBlock, _initial_info); } |
0 | 218 static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); } |
219 static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); } | |
220 | |
221 BasicType return_type() const { return _return_type; } | |
222 void print(); | |
223 }; | |
224 | |
225 //** Returns an UnrollBlock continuing information | |
226 // how to make room for the resulting interpreter frames. | |
227 // Called by assembly stub after execution has returned to | |
228 // deoptimized frame. | |
229 // @argument thread. Thread where stub_frame resides. | |
230 // @see OptoRuntime::deoptimization_fetch_unroll_info_C | |
231 static UnrollBlock* fetch_unroll_info(JavaThread* thread); | |
232 | |
233 //** Unpacks vframeArray onto execution stack | |
234 // Called by assembly stub after execution has returned to | |
235 // deoptimized frame and after the stack unrolling. | |
236 // @argument thread. Thread where stub_frame resides. | |
237 // @argument exec_mode. Determines how execution should be continuted in top frame. | |
238 // 0 means continue after current byte code | |
239 // 1 means exception has happened, handle exception | |
240 // 2 means reexecute current bytecode (for uncommon traps). | |
241 // @see OptoRuntime::deoptimization_unpack_frames_C | |
242 // Return BasicType of call return type, if any | |
243 static BasicType unpack_frames(JavaThread* thread, int exec_mode); | |
244 | |
245 // Cleans up deoptimization bits on thread after unpacking or in the | |
246 // case of an exception. | |
247 static void cleanup_deopt_info(JavaThread *thread, | |
248 vframeArray * array); | |
249 | |
250 // Restores callee saved values from deoptimized frame into oldest interpreter frame | |
251 // so caller of the deoptimized frame will get back the values it expects. | |
252 static void unwind_callee_save_values(frame* f, vframeArray* vframe_array); | |
253 | |
254 //** Performs an uncommon trap for compiled code. | |
255 // The top most compiler frame is converted into interpreter frames | |
256 static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); | |
257 // Helper routine that enters the VM and may block | |
258 static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index); | |
259 | |
260 //** Deoptimizes the frame identified by id. | |
261 // Only called from VMDeoptimizeFrame | |
262 // @argument thread. Thread where stub_frame resides. | |
263 // @argument id. id of frame that should be deoptimized. | |
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264 static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id, DeoptReason reason); |
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265 |
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266 // if thread is not the current thread then execute |
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267 // VM_DeoptimizeFrame otherwise deoptimize directly. |
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268 static void deoptimize_frame(JavaThread* thread, intptr_t* id, DeoptReason reason); |
0 | 269 |
270 // Statistics | |
271 static void gather_statistics(DeoptReason reason, DeoptAction action, | |
272 Bytecodes::Code bc = Bytecodes::_illegal); | |
273 static void print_statistics(); | |
274 | |
275 // How much room to adjust the last frame's SP by, to make space for | |
276 // the callee's interpreter frame (which expects locals to be next to | |
277 // incoming arguments) | |
278 static int last_frame_adjust(int callee_parameters, int callee_locals); | |
279 | |
280 // trap_request codes | |
281 static DeoptReason trap_request_reason(int trap_request) { | |
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282 if (trap_request < 0) { |
0 | 283 return (DeoptReason) |
284 ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits)); | |
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285 } else { |
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286 #ifdef GRAAL |
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287 ShouldNotReachHere(); |
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288 return Reason_none; |
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289 #else |
0 | 290 // standard reason for unloaded CP entry |
291 return Reason_unloaded; | |
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292 #endif // GRAAL |
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293 } |
0 | 294 } |
295 static DeoptAction trap_request_action(int trap_request) { | |
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296 if (trap_request < 0) { |
0 | 297 return (DeoptAction) |
298 ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits)); | |
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299 } else { |
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300 #ifdef GRAAL |
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301 ShouldNotReachHere(); |
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302 return Action_make_not_compilable; |
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303 #else |
0 | 304 // standard action for unloaded CP entry |
305 return _unloaded_action; | |
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306 #endif // GRAAL |
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307 } |
0 | 308 } |
309 static int trap_request_index(int trap_request) { | |
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310 if (trap_request < 0) { |
0 | 311 return -1; |
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312 } else { |
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313 #ifdef GRAAL |
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314 ShouldNotReachHere(); |
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315 return -1; |
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316 #else |
0 | 317 return trap_request; |
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318 #endif // GRAAL |
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319 } |
0 | 320 } |
321 static int make_trap_request(DeoptReason reason, DeoptAction action, | |
322 int index = -1) { | |
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323 #ifdef GRAAL |
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324 assert(index == -1, "Graal does not use index"); |
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325 #endif |
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326 |
0 | 327 assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits"); |
328 assert((1 << _action_bits) >= Action_LIMIT, "enough bits"); | |
329 int trap_request; | |
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330 if (index != -1) { |
0 | 331 trap_request = index; |
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332 } else { |
0 | 333 trap_request = (~(((reason) << _reason_shift) |
334 + ((action) << _action_shift))); | |
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335 } |
0 | 336 assert(reason == trap_request_reason(trap_request), "valid reason"); |
337 assert(action == trap_request_action(trap_request), "valid action"); | |
338 assert(index == trap_request_index(trap_request), "valid index"); | |
339 return trap_request; | |
340 } | |
341 | |
342 // The trap_state stored in a MDO is decoded here. | |
343 // It records two items of information. | |
344 // reason: If a deoptimization happened here, what its reason was, | |
345 // or if there were multiple deopts with differing reasons. | |
346 // recompiled: If a deoptimization here triggered a recompilation. | |
347 // Note that not all reasons are recorded per-bci. | |
348 static DeoptReason trap_state_reason(int trap_state); | |
349 static int trap_state_has_reason(int trap_state, int reason); | |
350 static int trap_state_add_reason(int trap_state, int reason); | |
351 static bool trap_state_is_recompiled(int trap_state); | |
352 static int trap_state_set_recompiled(int trap_state, bool z); | |
353 static const char* format_trap_state(char* buf, size_t buflen, | |
354 int trap_state); | |
355 | |
356 static bool reason_is_recorded_per_bytecode(DeoptReason reason) { | |
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357 return reason > Reason_none && reason <= Reason_RECORDED_LIMIT; |
0 | 358 } |
359 | |
360 static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) { | |
361 if (reason_is_recorded_per_bytecode(reason)) | |
362 return reason; | |
363 else if (reason == Reason_div0_check) // null check due to divide-by-zero? | |
364 return Reason_null_check; // recorded per BCI as a null check | |
365 else | |
366 return Reason_none; | |
367 } | |
368 | |
369 static const char* trap_reason_name(int reason); | |
370 static const char* trap_action_name(int action); | |
371 // Format like reason='foo' action='bar' index='123'. | |
372 // This is suitable both for XML and for tty output. | |
373 static const char* format_trap_request(char* buf, size_t buflen, | |
374 int trap_request); | |
375 | |
376 static jint total_deoptimization_count(); | |
377 static jint deoptimization_count(DeoptReason reason); | |
378 | |
379 // JVMTI PopFrame support | |
380 | |
381 // Preserves incoming arguments to the popped frame when it is | |
382 // returning to a deoptimized caller | |
383 static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address); | |
384 | |
385 private: | |
386 static methodDataOop get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing); | |
387 // Update the mdo's count and per-BCI reason bits, returning previous state: | |
388 static ProfileData* query_update_method_data(methodDataHandle trap_mdo, | |
389 int trap_bci, | |
390 DeoptReason reason, | |
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391 bool update_total_trap_count, |
0 | 392 //outputs: |
393 uint& ret_this_trap_count, | |
394 bool& ret_maybe_prior_trap, | |
395 bool& ret_maybe_prior_recompile); | |
396 // class loading support for uncommon trap | |
397 static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS); | |
398 static void load_class_by_index(constantPoolHandle constant_pool, int index); | |
399 | |
400 static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread); | |
401 | |
402 static DeoptAction _unloaded_action; // == Action_reinterpret; | |
403 static const char* _trap_reason_name[Reason_LIMIT]; | |
404 static const char* _trap_action_name[Action_LIMIT]; | |
405 | |
406 static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT]; | |
407 // Note: Histogram array size is 1-2 Kb. | |
408 | |
409 public: | |
410 static void update_method_data_from_interpreter(methodDataHandle trap_mdo, int trap_bci, int reason); | |
411 }; | |
412 | |
413 class DeoptimizationMarker : StackObj { // for profiling | |
414 static bool _is_active; | |
415 public: | |
416 DeoptimizationMarker() { _is_active = true; } | |
417 ~DeoptimizationMarker() { _is_active = false; } | |
418 static bool is_active() { return _is_active; } | |
419 }; | |
1972 | 420 |
421 #endif // SHARE_VM_RUNTIME_DEOPTIMIZATION_HPP |