Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.cpp @ 1172:b2b6a9bf6238
6894779: Loop Predication for Loop Optimizer in C2
Summary: Loop predication implementation
Reviewed-by: never, kvn
author | cfang |
---|---|
date | Tue, 12 Jan 2010 14:37:35 -0800 |
parents | bd02caa94611 |
children | ba263cfb7611 |
rev | line source |
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0 | 1 /* |
844 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
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 #include "incls/_precompiled.incl" | |
26 #include "incls/_deoptimization.cpp.incl" | |
27 | |
28 bool DeoptimizationMarker::_is_active = false; | |
29 | |
30 Deoptimization::UnrollBlock::UnrollBlock(int size_of_deoptimized_frame, | |
31 int caller_adjustment, | |
32 int number_of_frames, | |
33 intptr_t* frame_sizes, | |
34 address* frame_pcs, | |
35 BasicType return_type) { | |
36 _size_of_deoptimized_frame = size_of_deoptimized_frame; | |
37 _caller_adjustment = caller_adjustment; | |
38 _number_of_frames = number_of_frames; | |
39 _frame_sizes = frame_sizes; | |
40 _frame_pcs = frame_pcs; | |
41 _register_block = NEW_C_HEAP_ARRAY(intptr_t, RegisterMap::reg_count * 2); | |
42 _return_type = return_type; | |
43 // PD (x86 only) | |
44 _counter_temp = 0; | |
45 _initial_fp = 0; | |
46 _unpack_kind = 0; | |
47 _sender_sp_temp = 0; | |
48 | |
49 _total_frame_sizes = size_of_frames(); | |
50 } | |
51 | |
52 | |
53 Deoptimization::UnrollBlock::~UnrollBlock() { | |
54 FREE_C_HEAP_ARRAY(intptr_t, _frame_sizes); | |
55 FREE_C_HEAP_ARRAY(intptr_t, _frame_pcs); | |
56 FREE_C_HEAP_ARRAY(intptr_t, _register_block); | |
57 } | |
58 | |
59 | |
60 intptr_t* Deoptimization::UnrollBlock::value_addr_at(int register_number) const { | |
61 assert(register_number < RegisterMap::reg_count, "checking register number"); | |
62 return &_register_block[register_number * 2]; | |
63 } | |
64 | |
65 | |
66 | |
67 int Deoptimization::UnrollBlock::size_of_frames() const { | |
68 // Acount first for the adjustment of the initial frame | |
69 int result = _caller_adjustment; | |
70 for (int index = 0; index < number_of_frames(); index++) { | |
71 result += frame_sizes()[index]; | |
72 } | |
73 return result; | |
74 } | |
75 | |
76 | |
77 void Deoptimization::UnrollBlock::print() { | |
78 ttyLocker ttyl; | |
79 tty->print_cr("UnrollBlock"); | |
80 tty->print_cr(" size_of_deoptimized_frame = %d", _size_of_deoptimized_frame); | |
81 tty->print( " frame_sizes: "); | |
82 for (int index = 0; index < number_of_frames(); index++) { | |
83 tty->print("%d ", frame_sizes()[index]); | |
84 } | |
85 tty->cr(); | |
86 } | |
87 | |
88 | |
89 // In order to make fetch_unroll_info work properly with escape | |
90 // analysis, The method was changed from JRT_LEAF to JRT_BLOCK_ENTRY and | |
91 // ResetNoHandleMark and HandleMark were removed from it. The actual reallocation | |
92 // of previously eliminated objects occurs in realloc_objects, which is | |
93 // called from the method fetch_unroll_info_helper below. | |
94 JRT_BLOCK_ENTRY(Deoptimization::UnrollBlock*, Deoptimization::fetch_unroll_info(JavaThread* thread)) | |
95 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
96 // but makes the entry a little slower. There is however a little dance we have to | |
97 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
98 | |
99 // fetch_unroll_info() is called at the beginning of the deoptimization | |
100 // handler. Note this fact before we start generating temporary frames | |
101 // that can confuse an asynchronous stack walker. This counter is | |
102 // decremented at the end of unpack_frames(). | |
103 thread->inc_in_deopt_handler(); | |
104 | |
105 return fetch_unroll_info_helper(thread); | |
106 JRT_END | |
107 | |
108 | |
109 // This is factored, since it is both called from a JRT_LEAF (deoptimization) and a JRT_ENTRY (uncommon_trap) | |
110 Deoptimization::UnrollBlock* Deoptimization::fetch_unroll_info_helper(JavaThread* thread) { | |
111 | |
112 // Note: there is a safepoint safety issue here. No matter whether we enter | |
113 // via vanilla deopt or uncommon trap we MUST NOT stop at a safepoint once | |
114 // the vframeArray is created. | |
115 // | |
116 | |
117 // Allocate our special deoptimization ResourceMark | |
118 DeoptResourceMark* dmark = new DeoptResourceMark(thread); | |
119 assert(thread->deopt_mark() == NULL, "Pending deopt!"); | |
120 thread->set_deopt_mark(dmark); | |
121 | |
122 frame stub_frame = thread->last_frame(); // Makes stack walkable as side effect | |
123 RegisterMap map(thread, true); | |
124 RegisterMap dummy_map(thread, false); | |
125 // Now get the deoptee with a valid map | |
126 frame deoptee = stub_frame.sender(&map); | |
127 | |
128 // Create a growable array of VFrames where each VFrame represents an inlined | |
129 // Java frame. This storage is allocated with the usual system arena. | |
130 assert(deoptee.is_compiled_frame(), "Wrong frame type"); | |
131 GrowableArray<compiledVFrame*>* chunk = new GrowableArray<compiledVFrame*>(10); | |
132 vframe* vf = vframe::new_vframe(&deoptee, &map, thread); | |
133 while (!vf->is_top()) { | |
134 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
135 chunk->push(compiledVFrame::cast(vf)); | |
136 vf = vf->sender(); | |
137 } | |
138 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
139 chunk->push(compiledVFrame::cast(vf)); | |
140 | |
141 #ifdef COMPILER2 | |
142 // Reallocate the non-escaping objects and restore their fields. Then | |
143 // relock objects if synchronization on them was eliminated. | |
44
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144 if (DoEscapeAnalysis) { |
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145 if (EliminateAllocations) { |
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146 assert (chunk->at(0)->scope() != NULL,"expect only compiled java frames"); |
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147 GrowableArray<ScopeValue*>* objects = chunk->at(0)->scope()->objects(); |
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148 bool reallocated = false; |
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149 if (objects != NULL) { |
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150 JRT_BLOCK |
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151 reallocated = realloc_objects(thread, &deoptee, objects, THREAD); |
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152 JRT_END |
0 | 153 } |
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154 if (reallocated) { |
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155 reassign_fields(&deoptee, &map, objects); |
0 | 156 #ifndef PRODUCT |
157 if (TraceDeoptimization) { | |
158 ttyLocker ttyl; | |
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159 tty->print_cr("REALLOC OBJECTS in thread " INTPTR_FORMAT, thread); |
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160 print_objects(objects); |
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161 } |
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162 #endif |
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163 } |
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164 } |
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165 if (EliminateLocks) { |
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166 #ifndef PRODUCT |
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167 bool first = true; |
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168 #endif |
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169 for (int i = 0; i < chunk->length(); i++) { |
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170 compiledVFrame* cvf = chunk->at(i); |
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171 assert (cvf->scope() != NULL,"expect only compiled java frames"); |
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172 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); |
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173 if (monitors->is_nonempty()) { |
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174 relock_objects(monitors, thread); |
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175 #ifndef PRODUCT |
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176 if (TraceDeoptimization) { |
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177 ttyLocker ttyl; |
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178 for (int j = 0; j < monitors->length(); j++) { |
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179 MonitorInfo* mi = monitors->at(j); |
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180 if (mi->eliminated()) { |
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181 if (first) { |
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182 first = false; |
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183 tty->print_cr("RELOCK OBJECTS in thread " INTPTR_FORMAT, thread); |
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184 } |
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185 tty->print_cr(" object <" INTPTR_FORMAT "> locked", mi->owner()); |
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186 } |
0 | 187 } |
188 } | |
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189 #endif |
0 | 190 } |
191 } | |
192 } | |
193 } | |
194 #endif // COMPILER2 | |
195 // Ensure that no safepoint is taken after pointers have been stored | |
196 // in fields of rematerialized objects. If a safepoint occurs from here on | |
197 // out the java state residing in the vframeArray will be missed. | |
198 No_Safepoint_Verifier no_safepoint; | |
199 | |
200 vframeArray* array = create_vframeArray(thread, deoptee, &map, chunk); | |
201 | |
202 assert(thread->vframe_array_head() == NULL, "Pending deopt!");; | |
203 thread->set_vframe_array_head(array); | |
204 | |
205 // Now that the vframeArray has been created if we have any deferred local writes | |
206 // added by jvmti then we can free up that structure as the data is now in the | |
207 // vframeArray | |
208 | |
209 if (thread->deferred_locals() != NULL) { | |
210 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread->deferred_locals(); | |
211 int i = 0; | |
212 do { | |
213 // Because of inlining we could have multiple vframes for a single frame | |
214 // and several of the vframes could have deferred writes. Find them all. | |
215 if (list->at(i)->id() == array->original().id()) { | |
216 jvmtiDeferredLocalVariableSet* dlv = list->at(i); | |
217 list->remove_at(i); | |
218 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
219 delete dlv; | |
220 } else { | |
221 i++; | |
222 } | |
223 } while ( i < list->length() ); | |
224 if (list->length() == 0) { | |
225 thread->set_deferred_locals(NULL); | |
226 // free the list and elements back to C heap. | |
227 delete list; | |
228 } | |
229 | |
230 } | |
231 | |
232 // Compute the caller frame based on the sender sp of stub_frame and stored frame sizes info. | |
233 CodeBlob* cb = stub_frame.cb(); | |
234 // Verify we have the right vframeArray | |
235 assert(cb->frame_size() >= 0, "Unexpected frame size"); | |
236 intptr_t* unpack_sp = stub_frame.sp() + cb->frame_size(); | |
237 | |
238 #ifdef ASSERT | |
239 assert(cb->is_deoptimization_stub() || cb->is_uncommon_trap_stub(), "just checking"); | |
240 Events::log("fetch unroll sp " INTPTR_FORMAT, unpack_sp); | |
241 #endif | |
242 // This is a guarantee instead of an assert because if vframe doesn't match | |
243 // we will unpack the wrong deoptimized frame and wind up in strange places | |
244 // where it will be very difficult to figure out what went wrong. Better | |
245 // to die an early death here than some very obscure death later when the | |
246 // trail is cold. | |
247 // Note: on ia64 this guarantee can be fooled by frames with no memory stack | |
248 // in that it will fail to detect a problem when there is one. This needs | |
249 // more work in tiger timeframe. | |
250 guarantee(array->unextended_sp() == unpack_sp, "vframe_array_head must contain the vframeArray to unpack"); | |
251 | |
252 int number_of_frames = array->frames(); | |
253 | |
254 // Compute the vframes' sizes. Note that frame_sizes[] entries are ordered from outermost to innermost | |
255 // virtual activation, which is the reverse of the elements in the vframes array. | |
256 intptr_t* frame_sizes = NEW_C_HEAP_ARRAY(intptr_t, number_of_frames); | |
257 // +1 because we always have an interpreter return address for the final slot. | |
258 address* frame_pcs = NEW_C_HEAP_ARRAY(address, number_of_frames + 1); | |
259 int callee_parameters = 0; | |
260 int callee_locals = 0; | |
261 int popframe_extra_args = 0; | |
262 // Create an interpreter return address for the stub to use as its return | |
263 // address so the skeletal frames are perfectly walkable | |
264 frame_pcs[number_of_frames] = Interpreter::deopt_entry(vtos, 0); | |
265 | |
266 // PopFrame requires that the preserved incoming arguments from the recently-popped topmost | |
267 // activation be put back on the expression stack of the caller for reexecution | |
268 if (JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) { | |
269 popframe_extra_args = in_words(thread->popframe_preserved_args_size_in_words()); | |
270 } | |
271 | |
272 // | |
273 // frame_sizes/frame_pcs[0] oldest frame (int or c2i) | |
274 // frame_sizes/frame_pcs[1] next oldest frame (int) | |
275 // frame_sizes/frame_pcs[n] youngest frame (int) | |
276 // | |
277 // Now a pc in frame_pcs is actually the return address to the frame's caller (a frame | |
278 // owns the space for the return address to it's caller). Confusing ain't it. | |
279 // | |
280 // The vframe array can address vframes with indices running from | |
281 // 0.._frames-1. Index 0 is the youngest frame and _frame - 1 is the oldest (root) frame. | |
282 // When we create the skeletal frames we need the oldest frame to be in the zero slot | |
283 // in the frame_sizes/frame_pcs so the assembly code can do a trivial walk. | |
284 // so things look a little strange in this loop. | |
285 // | |
286 for (int index = 0; index < array->frames(); index++ ) { | |
287 // frame[number_of_frames - 1 ] = on_stack_size(youngest) | |
288 // frame[number_of_frames - 2 ] = on_stack_size(sender(youngest)) | |
289 // frame[number_of_frames - 3 ] = on_stack_size(sender(sender(youngest))) | |
290 frame_sizes[number_of_frames - 1 - index] = BytesPerWord * array->element(index)->on_stack_size(callee_parameters, | |
291 callee_locals, | |
292 index == 0, | |
293 popframe_extra_args); | |
294 // This pc doesn't have to be perfect just good enough to identify the frame | |
295 // as interpreted so the skeleton frame will be walkable | |
296 // The correct pc will be set when the skeleton frame is completely filled out | |
297 // The final pc we store in the loop is wrong and will be overwritten below | |
298 frame_pcs[number_of_frames - 1 - index ] = Interpreter::deopt_entry(vtos, 0) - frame::pc_return_offset; | |
299 | |
300 callee_parameters = array->element(index)->method()->size_of_parameters(); | |
301 callee_locals = array->element(index)->method()->max_locals(); | |
302 popframe_extra_args = 0; | |
303 } | |
304 | |
305 // Compute whether the root vframe returns a float or double value. | |
306 BasicType return_type; | |
307 { | |
308 HandleMark hm; | |
309 methodHandle method(thread, array->element(0)->method()); | |
310 Bytecode_invoke* invoke = Bytecode_invoke_at_check(method, array->element(0)->bci()); | |
311 return_type = (invoke != NULL) ? invoke->result_type(thread) : T_ILLEGAL; | |
312 } | |
313 | |
314 // Compute information for handling adapters and adjusting the frame size of the caller. | |
315 int caller_adjustment = 0; | |
316 | |
317 // Find the current pc for sender of the deoptee. Since the sender may have been deoptimized | |
318 // itself since the deoptee vframeArray was created we must get a fresh value of the pc rather | |
319 // than simply use array->sender.pc(). This requires us to walk the current set of frames | |
320 // | |
321 frame deopt_sender = stub_frame.sender(&dummy_map); // First is the deoptee frame | |
322 deopt_sender = deopt_sender.sender(&dummy_map); // Now deoptee caller | |
323 | |
324 // Compute the amount the oldest interpreter frame will have to adjust | |
325 // its caller's stack by. If the caller is a compiled frame then | |
326 // we pretend that the callee has no parameters so that the | |
327 // extension counts for the full amount of locals and not just | |
328 // locals-parms. This is because without a c2i adapter the parm | |
329 // area as created by the compiled frame will not be usable by | |
330 // the interpreter. (Depending on the calling convention there | |
331 // may not even be enough space). | |
332 | |
333 // QQQ I'd rather see this pushed down into last_frame_adjust | |
334 // and have it take the sender (aka caller). | |
335 | |
336 if (deopt_sender.is_compiled_frame()) { | |
337 caller_adjustment = last_frame_adjust(0, callee_locals); | |
338 } else if (callee_locals > callee_parameters) { | |
339 // The caller frame may need extending to accommodate | |
340 // non-parameter locals of the first unpacked interpreted frame. | |
341 // Compute that adjustment. | |
342 caller_adjustment = last_frame_adjust(callee_parameters, callee_locals); | |
343 } | |
344 | |
345 | |
346 // If the sender is deoptimized the we must retrieve the address of the handler | |
347 // since the frame will "magically" show the original pc before the deopt | |
348 // and we'd undo the deopt. | |
349 | |
350 frame_pcs[0] = deopt_sender.raw_pc(); | |
351 | |
352 assert(CodeCache::find_blob_unsafe(frame_pcs[0]) != NULL, "bad pc"); | |
353 | |
354 UnrollBlock* info = new UnrollBlock(array->frame_size() * BytesPerWord, | |
355 caller_adjustment * BytesPerWord, | |
356 number_of_frames, | |
357 frame_sizes, | |
358 frame_pcs, | |
359 return_type); | |
360 #if defined(IA32) || defined(AMD64) | |
361 // We need a way to pass fp to the unpacking code so the skeletal frames | |
362 // come out correct. This is only needed for x86 because of c2 using ebp | |
363 // as an allocatable register. So this update is useless (and harmless) | |
364 // on the other platforms. It would be nice to do this in a different | |
365 // way but even the old style deoptimization had a problem with deriving | |
366 // this value. NEEDS_CLEANUP | |
367 // Note: now that c1 is using c2's deopt blob we must do this on all | |
368 // x86 based platforms | |
369 intptr_t** fp_addr = (intptr_t**) (((address)info) + info->initial_fp_offset_in_bytes()); | |
370 *fp_addr = array->sender().fp(); // was adapter_caller | |
371 #endif /* IA32 || AMD64 */ | |
372 | |
373 if (array->frames() > 1) { | |
374 if (VerifyStack && TraceDeoptimization) { | |
375 tty->print_cr("Deoptimizing method containing inlining"); | |
376 } | |
377 } | |
378 | |
379 array->set_unroll_block(info); | |
380 return info; | |
381 } | |
382 | |
383 // Called to cleanup deoptimization data structures in normal case | |
384 // after unpacking to stack and when stack overflow error occurs | |
385 void Deoptimization::cleanup_deopt_info(JavaThread *thread, | |
386 vframeArray *array) { | |
387 | |
388 // Get array if coming from exception | |
389 if (array == NULL) { | |
390 array = thread->vframe_array_head(); | |
391 } | |
392 thread->set_vframe_array_head(NULL); | |
393 | |
394 // Free the previous UnrollBlock | |
395 vframeArray* old_array = thread->vframe_array_last(); | |
396 thread->set_vframe_array_last(array); | |
397 | |
398 if (old_array != NULL) { | |
399 UnrollBlock* old_info = old_array->unroll_block(); | |
400 old_array->set_unroll_block(NULL); | |
401 delete old_info; | |
402 delete old_array; | |
403 } | |
404 | |
405 // Deallocate any resource creating in this routine and any ResourceObjs allocated | |
406 // inside the vframeArray (StackValueCollections) | |
407 | |
408 delete thread->deopt_mark(); | |
409 thread->set_deopt_mark(NULL); | |
410 | |
411 | |
412 if (JvmtiExport::can_pop_frame()) { | |
413 #ifndef CC_INTERP | |
414 // Regardless of whether we entered this routine with the pending | |
415 // popframe condition bit set, we should always clear it now | |
416 thread->clear_popframe_condition(); | |
417 #else | |
418 // C++ interpeter will clear has_pending_popframe when it enters | |
419 // with method_resume. For deopt_resume2 we clear it now. | |
420 if (thread->popframe_forcing_deopt_reexecution()) | |
421 thread->clear_popframe_condition(); | |
422 #endif /* CC_INTERP */ | |
423 } | |
424 | |
425 // unpack_frames() is called at the end of the deoptimization handler | |
426 // and (in C2) at the end of the uncommon trap handler. Note this fact | |
427 // so that an asynchronous stack walker can work again. This counter is | |
428 // incremented at the beginning of fetch_unroll_info() and (in C2) at | |
429 // the beginning of uncommon_trap(). | |
430 thread->dec_in_deopt_handler(); | |
431 } | |
432 | |
433 | |
434 // Return BasicType of value being returned | |
435 JRT_LEAF(BasicType, Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)) | |
436 | |
437 // We are already active int he special DeoptResourceMark any ResourceObj's we | |
438 // allocate will be freed at the end of the routine. | |
439 | |
440 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
441 // but makes the entry a little slower. There is however a little dance we have to | |
442 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
443 ResetNoHandleMark rnhm; // No-op in release/product versions | |
444 HandleMark hm; | |
445 | |
446 frame stub_frame = thread->last_frame(); | |
447 | |
448 // Since the frame to unpack is the top frame of this thread, the vframe_array_head | |
449 // must point to the vframeArray for the unpack frame. | |
450 vframeArray* array = thread->vframe_array_head(); | |
451 | |
452 #ifndef PRODUCT | |
453 if (TraceDeoptimization) { | |
454 tty->print_cr("DEOPT UNPACKING thread " INTPTR_FORMAT " vframeArray " INTPTR_FORMAT " mode %d", thread, array, exec_mode); | |
455 } | |
456 #endif | |
457 | |
458 UnrollBlock* info = array->unroll_block(); | |
459 | |
460 // Unpack the interpreter frames and any adapter frame (c2 only) we might create. | |
461 array->unpack_to_stack(stub_frame, exec_mode); | |
462 | |
463 BasicType bt = info->return_type(); | |
464 | |
465 // If we have an exception pending, claim that the return type is an oop | |
466 // so the deopt_blob does not overwrite the exception_oop. | |
467 | |
468 if (exec_mode == Unpack_exception) | |
469 bt = T_OBJECT; | |
470 | |
471 // Cleanup thread deopt data | |
472 cleanup_deopt_info(thread, array); | |
473 | |
474 #ifndef PRODUCT | |
475 if (VerifyStack) { | |
476 ResourceMark res_mark; | |
477 | |
478 // Verify that the just-unpacked frames match the interpreter's | |
479 // notions of expression stack and locals | |
480 vframeArray* cur_array = thread->vframe_array_last(); | |
481 RegisterMap rm(thread, false); | |
482 rm.set_include_argument_oops(false); | |
483 bool is_top_frame = true; | |
484 int callee_size_of_parameters = 0; | |
485 int callee_max_locals = 0; | |
486 for (int i = 0; i < cur_array->frames(); i++) { | |
487 vframeArrayElement* el = cur_array->element(i); | |
488 frame* iframe = el->iframe(); | |
489 guarantee(iframe->is_interpreted_frame(), "Wrong frame type"); | |
490 | |
491 // Get the oop map for this bci | |
492 InterpreterOopMap mask; | |
493 int cur_invoke_parameter_size = 0; | |
494 bool try_next_mask = false; | |
495 int next_mask_expression_stack_size = -1; | |
496 int top_frame_expression_stack_adjustment = 0; | |
497 methodHandle mh(thread, iframe->interpreter_frame_method()); | |
498 OopMapCache::compute_one_oop_map(mh, iframe->interpreter_frame_bci(), &mask); | |
499 BytecodeStream str(mh); | |
500 str.set_start(iframe->interpreter_frame_bci()); | |
501 int max_bci = mh->code_size(); | |
502 // Get to the next bytecode if possible | |
503 assert(str.bci() < max_bci, "bci in interpreter frame out of bounds"); | |
504 // Check to see if we can grab the number of outgoing arguments | |
505 // at an uncommon trap for an invoke (where the compiler | |
506 // generates debug info before the invoke has executed) | |
507 Bytecodes::Code cur_code = str.next(); | |
508 if (cur_code == Bytecodes::_invokevirtual || | |
509 cur_code == Bytecodes::_invokespecial || | |
510 cur_code == Bytecodes::_invokestatic || | |
511 cur_code == Bytecodes::_invokeinterface) { | |
512 Bytecode_invoke* invoke = Bytecode_invoke_at(mh, iframe->interpreter_frame_bci()); | |
513 symbolHandle signature(thread, invoke->signature()); | |
514 ArgumentSizeComputer asc(signature); | |
515 cur_invoke_parameter_size = asc.size(); | |
516 if (cur_code != Bytecodes::_invokestatic) { | |
517 // Add in receiver | |
518 ++cur_invoke_parameter_size; | |
519 } | |
520 } | |
521 if (str.bci() < max_bci) { | |
522 Bytecodes::Code bc = str.next(); | |
523 if (bc >= 0) { | |
524 // The interpreter oop map generator reports results before | |
525 // the current bytecode has executed except in the case of | |
526 // calls. It seems to be hard to tell whether the compiler | |
527 // has emitted debug information matching the "state before" | |
528 // a given bytecode or the state after, so we try both | |
529 switch (cur_code) { | |
530 case Bytecodes::_invokevirtual: | |
531 case Bytecodes::_invokespecial: | |
532 case Bytecodes::_invokestatic: | |
533 case Bytecodes::_invokeinterface: | |
534 case Bytecodes::_athrow: | |
535 break; | |
536 default: { | |
537 InterpreterOopMap next_mask; | |
538 OopMapCache::compute_one_oop_map(mh, str.bci(), &next_mask); | |
539 next_mask_expression_stack_size = next_mask.expression_stack_size(); | |
540 // Need to subtract off the size of the result type of | |
541 // the bytecode because this is not described in the | |
542 // debug info but returned to the interpreter in the TOS | |
543 // caching register | |
544 BasicType bytecode_result_type = Bytecodes::result_type(cur_code); | |
545 if (bytecode_result_type != T_ILLEGAL) { | |
546 top_frame_expression_stack_adjustment = type2size[bytecode_result_type]; | |
547 } | |
548 assert(top_frame_expression_stack_adjustment >= 0, ""); | |
549 try_next_mask = true; | |
550 break; | |
551 } | |
552 } | |
553 } | |
554 } | |
555 | |
556 // Verify stack depth and oops in frame | |
557 // This assertion may be dependent on the platform we're running on and may need modification (tested on x86 and sparc) | |
558 if (!( | |
559 /* SPARC */ | |
560 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_size_of_parameters) || | |
561 /* x86 */ | |
562 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_max_locals) || | |
563 (try_next_mask && | |
564 (iframe->interpreter_frame_expression_stack_size() == (next_mask_expression_stack_size - | |
565 top_frame_expression_stack_adjustment))) || | |
566 (is_top_frame && (exec_mode == Unpack_exception) && iframe->interpreter_frame_expression_stack_size() == 0) || | |
567 (is_top_frame && (exec_mode == Unpack_uncommon_trap || exec_mode == Unpack_reexecute) && | |
568 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + cur_invoke_parameter_size)) | |
569 )) { | |
570 ttyLocker ttyl; | |
571 | |
572 // Print out some information that will help us debug the problem | |
573 tty->print_cr("Wrong number of expression stack elements during deoptimization"); | |
574 tty->print_cr(" Error occurred while verifying frame %d (0..%d, 0 is topmost)", i, cur_array->frames() - 1); | |
575 tty->print_cr(" Fabricated interpreter frame had %d expression stack elements", | |
576 iframe->interpreter_frame_expression_stack_size()); | |
577 tty->print_cr(" Interpreter oop map had %d expression stack elements", mask.expression_stack_size()); | |
578 tty->print_cr(" try_next_mask = %d", try_next_mask); | |
579 tty->print_cr(" next_mask_expression_stack_size = %d", next_mask_expression_stack_size); | |
580 tty->print_cr(" callee_size_of_parameters = %d", callee_size_of_parameters); | |
581 tty->print_cr(" callee_max_locals = %d", callee_max_locals); | |
582 tty->print_cr(" top_frame_expression_stack_adjustment = %d", top_frame_expression_stack_adjustment); | |
583 tty->print_cr(" exec_mode = %d", exec_mode); | |
584 tty->print_cr(" cur_invoke_parameter_size = %d", cur_invoke_parameter_size); | |
585 tty->print_cr(" Thread = " INTPTR_FORMAT ", thread ID = " UINTX_FORMAT, thread, thread->osthread()->thread_id()); | |
586 tty->print_cr(" Interpreted frames:"); | |
587 for (int k = 0; k < cur_array->frames(); k++) { | |
588 vframeArrayElement* el = cur_array->element(k); | |
589 tty->print_cr(" %s (bci %d)", el->method()->name_and_sig_as_C_string(), el->bci()); | |
590 } | |
591 cur_array->print_on_2(tty); | |
592 guarantee(false, "wrong number of expression stack elements during deopt"); | |
593 } | |
594 VerifyOopClosure verify; | |
595 iframe->oops_interpreted_do(&verify, &rm, false); | |
596 callee_size_of_parameters = mh->size_of_parameters(); | |
597 callee_max_locals = mh->max_locals(); | |
598 is_top_frame = false; | |
599 } | |
600 } | |
601 #endif /* !PRODUCT */ | |
602 | |
603 | |
604 return bt; | |
605 JRT_END | |
606 | |
607 | |
608 int Deoptimization::deoptimize_dependents() { | |
609 Threads::deoptimized_wrt_marked_nmethods(); | |
610 return 0; | |
611 } | |
612 | |
613 | |
614 #ifdef COMPILER2 | |
615 bool Deoptimization::realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS) { | |
616 Handle pending_exception(thread->pending_exception()); | |
617 const char* exception_file = thread->exception_file(); | |
618 int exception_line = thread->exception_line(); | |
619 thread->clear_pending_exception(); | |
620 | |
621 for (int i = 0; i < objects->length(); i++) { | |
622 assert(objects->at(i)->is_object(), "invalid debug information"); | |
623 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
624 | |
625 KlassHandle k(((ConstantOopReadValue*) sv->klass())->value()()); | |
626 oop obj = NULL; | |
627 | |
628 if (k->oop_is_instance()) { | |
629 instanceKlass* ik = instanceKlass::cast(k()); | |
630 obj = ik->allocate_instance(CHECK_(false)); | |
631 } else if (k->oop_is_typeArray()) { | |
632 typeArrayKlass* ak = typeArrayKlass::cast(k()); | |
633 assert(sv->field_size() % type2size[ak->element_type()] == 0, "non-integral array length"); | |
634 int len = sv->field_size() / type2size[ak->element_type()]; | |
635 obj = ak->allocate(len, CHECK_(false)); | |
636 } else if (k->oop_is_objArray()) { | |
637 objArrayKlass* ak = objArrayKlass::cast(k()); | |
638 obj = ak->allocate(sv->field_size(), CHECK_(false)); | |
639 } | |
640 | |
641 assert(obj != NULL, "allocation failed"); | |
642 assert(sv->value().is_null(), "redundant reallocation"); | |
643 sv->set_value(obj); | |
644 } | |
645 | |
646 if (pending_exception.not_null()) { | |
647 thread->set_pending_exception(pending_exception(), exception_file, exception_line); | |
648 } | |
649 | |
650 return true; | |
651 } | |
652 | |
653 // This assumes that the fields are stored in ObjectValue in the same order | |
654 // they are yielded by do_nonstatic_fields. | |
655 class FieldReassigner: public FieldClosure { | |
656 frame* _fr; | |
657 RegisterMap* _reg_map; | |
658 ObjectValue* _sv; | |
659 instanceKlass* _ik; | |
660 oop _obj; | |
661 | |
662 int _i; | |
663 public: | |
664 FieldReassigner(frame* fr, RegisterMap* reg_map, ObjectValue* sv, oop obj) : | |
665 _fr(fr), _reg_map(reg_map), _sv(sv), _obj(obj), _i(0) {} | |
666 | |
667 int i() const { return _i; } | |
668 | |
669 | |
670 void do_field(fieldDescriptor* fd) { | |
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671 intptr_t val; |
0 | 672 StackValue* value = |
673 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(i())); | |
674 int offset = fd->offset(); | |
675 switch (fd->field_type()) { | |
676 case T_OBJECT: case T_ARRAY: | |
677 assert(value->type() == T_OBJECT, "Agreement."); | |
678 _obj->obj_field_put(offset, value->get_obj()()); | |
679 break; | |
680 | |
681 case T_LONG: case T_DOUBLE: { | |
682 assert(value->type() == T_INT, "Agreement."); | |
683 StackValue* low = | |
684 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(++_i)); | |
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685 #ifdef _LP64 |
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686 jlong res = (jlong)low->get_int(); |
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687 #else |
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688 #ifdef SPARC |
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689 // For SPARC we have to swap high and low words. |
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690 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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691 #else |
0 | 692 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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693 #endif //SPARC |
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694 #endif |
0 | 695 _obj->long_field_put(offset, res); |
696 break; | |
697 } | |
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698 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
0 | 699 case T_INT: case T_FLOAT: // 4 bytes. |
700 assert(value->type() == T_INT, "Agreement."); | |
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701 val = value->get_int(); |
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702 _obj->int_field_put(offset, (jint)*((jint*)&val)); |
0 | 703 break; |
704 | |
705 case T_SHORT: case T_CHAR: // 2 bytes | |
706 assert(value->type() == T_INT, "Agreement."); | |
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707 val = value->get_int(); |
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708 _obj->short_field_put(offset, (jshort)*((jint*)&val)); |
0 | 709 break; |
710 | |
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711 case T_BOOLEAN: case T_BYTE: // 1 byte |
0 | 712 assert(value->type() == T_INT, "Agreement."); |
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713 val = value->get_int(); |
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714 _obj->bool_field_put(offset, (jboolean)*((jint*)&val)); |
0 | 715 break; |
716 | |
717 default: | |
718 ShouldNotReachHere(); | |
719 } | |
720 _i++; | |
721 } | |
722 }; | |
723 | |
724 // restore elements of an eliminated type array | |
725 void Deoptimization::reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type) { | |
726 int index = 0; | |
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727 intptr_t val; |
0 | 728 |
729 for (int i = 0; i < sv->field_size(); i++) { | |
730 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
731 switch(type) { | |
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732 case T_LONG: case T_DOUBLE: { |
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733 assert(value->type() == T_INT, "Agreement."); |
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734 StackValue* low = |
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735 StackValue::create_stack_value(fr, reg_map, sv->field_at(++i)); |
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736 #ifdef _LP64 |
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737 jlong res = (jlong)low->get_int(); |
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738 #else |
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739 #ifdef SPARC |
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740 // For SPARC we have to swap high and low words. |
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741 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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742 #else |
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743 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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744 #endif //SPARC |
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745 #endif |
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746 obj->long_at_put(index, res); |
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747 break; |
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748 } |
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749 |
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750 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
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751 case T_INT: case T_FLOAT: // 4 bytes. |
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752 assert(value->type() == T_INT, "Agreement."); |
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753 val = value->get_int(); |
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754 obj->int_at_put(index, (jint)*((jint*)&val)); |
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755 break; |
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756 |
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757 case T_SHORT: case T_CHAR: // 2 bytes |
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758 assert(value->type() == T_INT, "Agreement."); |
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759 val = value->get_int(); |
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760 obj->short_at_put(index, (jshort)*((jint*)&val)); |
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761 break; |
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762 |
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763 case T_BOOLEAN: case T_BYTE: // 1 byte |
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764 assert(value->type() == T_INT, "Agreement."); |
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765 val = value->get_int(); |
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766 obj->bool_at_put(index, (jboolean)*((jint*)&val)); |
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767 break; |
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768 |
0 | 769 default: |
770 ShouldNotReachHere(); | |
771 } | |
772 index++; | |
773 } | |
774 } | |
775 | |
776 | |
777 // restore fields of an eliminated object array | |
778 void Deoptimization::reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj) { | |
779 for (int i = 0; i < sv->field_size(); i++) { | |
780 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
781 assert(value->type() == T_OBJECT, "object element expected"); | |
782 obj->obj_at_put(i, value->get_obj()()); | |
783 } | |
784 } | |
785 | |
786 | |
787 // restore fields of all eliminated objects and arrays | |
788 void Deoptimization::reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects) { | |
789 for (int i = 0; i < objects->length(); i++) { | |
790 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
791 KlassHandle k(((ConstantOopReadValue*) sv->klass())->value()()); | |
792 Handle obj = sv->value(); | |
793 assert(obj.not_null(), "reallocation was missed"); | |
794 | |
795 if (k->oop_is_instance()) { | |
796 instanceKlass* ik = instanceKlass::cast(k()); | |
797 FieldReassigner reassign(fr, reg_map, sv, obj()); | |
798 ik->do_nonstatic_fields(&reassign); | |
799 } else if (k->oop_is_typeArray()) { | |
800 typeArrayKlass* ak = typeArrayKlass::cast(k()); | |
801 reassign_type_array_elements(fr, reg_map, sv, (typeArrayOop) obj(), ak->element_type()); | |
802 } else if (k->oop_is_objArray()) { | |
803 reassign_object_array_elements(fr, reg_map, sv, (objArrayOop) obj()); | |
804 } | |
805 } | |
806 } | |
807 | |
808 | |
809 // relock objects for which synchronization was eliminated | |
83
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810 void Deoptimization::relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread) { |
0 | 811 for (int i = 0; i < monitors->length(); i++) { |
83
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812 MonitorInfo* mon_info = monitors->at(i); |
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813 if (mon_info->eliminated()) { |
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814 assert(mon_info->owner() != NULL, "reallocation was missed"); |
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815 Handle obj = Handle(mon_info->owner()); |
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816 markOop mark = obj->mark(); |
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817 if (UseBiasedLocking && mark->has_bias_pattern()) { |
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818 // New allocated objects may have the mark set to anonymously biased. |
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819 // Also the deoptimized method may called methods with synchronization |
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820 // where the thread-local object is bias locked to the current thread. |
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821 assert(mark->is_biased_anonymously() || |
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822 mark->biased_locker() == thread, "should be locked to current thread"); |
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823 // Reset mark word to unbiased prototype. |
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824 markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
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825 obj->set_mark(unbiased_prototype); |
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826 } |
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827 BasicLock* lock = mon_info->lock(); |
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828 ObjectSynchronizer::slow_enter(obj, lock, thread); |
0 | 829 } |
83
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830 assert(mon_info->owner()->is_locked(), "object must be locked now"); |
0 | 831 } |
832 } | |
833 | |
834 | |
835 #ifndef PRODUCT | |
836 // print information about reallocated objects | |
837 void Deoptimization::print_objects(GrowableArray<ScopeValue*>* objects) { | |
838 fieldDescriptor fd; | |
839 | |
840 for (int i = 0; i < objects->length(); i++) { | |
841 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
842 KlassHandle k(((ConstantOopReadValue*) sv->klass())->value()()); | |
843 Handle obj = sv->value(); | |
844 | |
845 tty->print(" object <" INTPTR_FORMAT "> of type ", sv->value()()); | |
846 k->as_klassOop()->print_value(); | |
847 tty->print(" allocated (%d bytes)", obj->size() * HeapWordSize); | |
848 tty->cr(); | |
849 | |
850 if (Verbose) { | |
851 k->oop_print_on(obj(), tty); | |
852 } | |
853 } | |
854 } | |
855 #endif | |
856 #endif // COMPILER2 | |
857 | |
858 vframeArray* Deoptimization::create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk) { | |
859 | |
860 #ifndef PRODUCT | |
861 if (TraceDeoptimization) { | |
862 ttyLocker ttyl; | |
863 tty->print("DEOPT PACKING thread " INTPTR_FORMAT " ", thread); | |
864 fr.print_on(tty); | |
865 tty->print_cr(" Virtual frames (innermost first):"); | |
866 for (int index = 0; index < chunk->length(); index++) { | |
867 compiledVFrame* vf = chunk->at(index); | |
868 tty->print(" %2d - ", index); | |
869 vf->print_value(); | |
870 int bci = chunk->at(index)->raw_bci(); | |
871 const char* code_name; | |
872 if (bci == SynchronizationEntryBCI) { | |
873 code_name = "sync entry"; | |
874 } else { | |
875 Bytecodes::Code code = Bytecodes::code_at(vf->method(), bci); | |
876 code_name = Bytecodes::name(code); | |
877 } | |
878 tty->print(" - %s", code_name); | |
879 tty->print_cr(" @ bci %d ", bci); | |
880 if (Verbose) { | |
881 vf->print(); | |
882 tty->cr(); | |
883 } | |
884 } | |
885 } | |
886 #endif | |
887 | |
888 // Register map for next frame (used for stack crawl). We capture | |
889 // the state of the deopt'ing frame's caller. Thus if we need to | |
890 // stuff a C2I adapter we can properly fill in the callee-save | |
891 // register locations. | |
892 frame caller = fr.sender(reg_map); | |
893 int frame_size = caller.sp() - fr.sp(); | |
894 | |
895 frame sender = caller; | |
896 | |
897 // Since the Java thread being deoptimized will eventually adjust it's own stack, | |
898 // the vframeArray containing the unpacking information is allocated in the C heap. | |
899 // For Compiler1, the caller of the deoptimized frame is saved for use by unpack_frames(). | |
900 vframeArray* array = vframeArray::allocate(thread, frame_size, chunk, reg_map, sender, caller, fr); | |
901 | |
902 // Compare the vframeArray to the collected vframes | |
903 assert(array->structural_compare(thread, chunk), "just checking"); | |
904 Events::log("# vframes = %d", (intptr_t)chunk->length()); | |
905 | |
906 #ifndef PRODUCT | |
907 if (TraceDeoptimization) { | |
908 ttyLocker ttyl; | |
909 tty->print_cr(" Created vframeArray " INTPTR_FORMAT, array); | |
910 if (Verbose) { | |
911 int count = 0; | |
912 // this used to leak deoptimizedVFrame like it was going out of style!!! | |
913 for (int index = 0; index < array->frames(); index++ ) { | |
914 vframeArrayElement* e = array->element(index); | |
915 e->print(tty); | |
916 | |
917 /* | |
918 No printing yet. | |
919 array->vframe_at(index)->print_activation(count++); | |
920 // better as... | |
921 array->print_activation_for(index, count++); | |
922 */ | |
923 } | |
924 } | |
925 } | |
926 #endif // PRODUCT | |
927 | |
928 return array; | |
929 } | |
930 | |
931 | |
932 static void collect_monitors(compiledVFrame* cvf, GrowableArray<Handle>* objects_to_revoke) { | |
933 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); | |
934 for (int i = 0; i < monitors->length(); i++) { | |
935 MonitorInfo* mon_info = monitors->at(i); | |
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936 if (!mon_info->eliminated() && mon_info->owner() != NULL) { |
0 | 937 objects_to_revoke->append(Handle(mon_info->owner())); |
938 } | |
939 } | |
940 } | |
941 | |
942 | |
943 void Deoptimization::revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map) { | |
944 if (!UseBiasedLocking) { | |
945 return; | |
946 } | |
947 | |
948 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
949 | |
950 // Unfortunately we don't have a RegisterMap available in most of | |
951 // the places we want to call this routine so we need to walk the | |
952 // stack again to update the register map. | |
953 if (map == NULL || !map->update_map()) { | |
954 StackFrameStream sfs(thread, true); | |
955 bool found = false; | |
956 while (!found && !sfs.is_done()) { | |
957 frame* cur = sfs.current(); | |
958 sfs.next(); | |
959 found = cur->id() == fr.id(); | |
960 } | |
961 assert(found, "frame to be deoptimized not found on target thread's stack"); | |
962 map = sfs.register_map(); | |
963 } | |
964 | |
965 vframe* vf = vframe::new_vframe(&fr, map, thread); | |
966 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
967 // Revoke monitors' biases in all scopes | |
968 while (!cvf->is_top()) { | |
969 collect_monitors(cvf, objects_to_revoke); | |
970 cvf = compiledVFrame::cast(cvf->sender()); | |
971 } | |
972 collect_monitors(cvf, objects_to_revoke); | |
973 | |
974 if (SafepointSynchronize::is_at_safepoint()) { | |
975 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
976 } else { | |
977 BiasedLocking::revoke(objects_to_revoke); | |
978 } | |
979 } | |
980 | |
981 | |
982 void Deoptimization::revoke_biases_of_monitors(CodeBlob* cb) { | |
983 if (!UseBiasedLocking) { | |
984 return; | |
985 } | |
986 | |
987 assert(SafepointSynchronize::is_at_safepoint(), "must only be called from safepoint"); | |
988 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
989 for (JavaThread* jt = Threads::first(); jt != NULL ; jt = jt->next()) { | |
990 if (jt->has_last_Java_frame()) { | |
991 StackFrameStream sfs(jt, true); | |
992 while (!sfs.is_done()) { | |
993 frame* cur = sfs.current(); | |
994 if (cb->contains(cur->pc())) { | |
995 vframe* vf = vframe::new_vframe(cur, sfs.register_map(), jt); | |
996 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
997 // Revoke monitors' biases in all scopes | |
998 while (!cvf->is_top()) { | |
999 collect_monitors(cvf, objects_to_revoke); | |
1000 cvf = compiledVFrame::cast(cvf->sender()); | |
1001 } | |
1002 collect_monitors(cvf, objects_to_revoke); | |
1003 } | |
1004 sfs.next(); | |
1005 } | |
1006 } | |
1007 } | |
1008 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
1009 } | |
1010 | |
1011 | |
1012 void Deoptimization::deoptimize_single_frame(JavaThread* thread, frame fr) { | |
1013 assert(fr.can_be_deoptimized(), "checking frame type"); | |
1014 | |
1015 gather_statistics(Reason_constraint, Action_none, Bytecodes::_illegal); | |
1016 | |
1017 EventMark m("Deoptimization (pc=" INTPTR_FORMAT ", sp=" INTPTR_FORMAT ")", fr.pc(), fr.id()); | |
1018 | |
1019 // Patch the nmethod so that when execution returns to it we will | |
1020 // deopt the execution state and return to the interpreter. | |
1021 fr.deoptimize(thread); | |
1022 } | |
1023 | |
1024 void Deoptimization::deoptimize(JavaThread* thread, frame fr, RegisterMap *map) { | |
1025 // Deoptimize only if the frame comes from compile code. | |
1026 // Do not deoptimize the frame which is already patched | |
1027 // during the execution of the loops below. | |
1028 if (!fr.is_compiled_frame() || fr.is_deoptimized_frame()) { | |
1029 return; | |
1030 } | |
1031 ResourceMark rm; | |
1032 DeoptimizationMarker dm; | |
1033 if (UseBiasedLocking) { | |
1034 revoke_biases_of_monitors(thread, fr, map); | |
1035 } | |
1036 deoptimize_single_frame(thread, fr); | |
1037 | |
1038 } | |
1039 | |
1040 | |
1041 void Deoptimization::deoptimize_frame(JavaThread* thread, intptr_t* id) { | |
1042 // Compute frame and register map based on thread and sp. | |
1043 RegisterMap reg_map(thread, UseBiasedLocking); | |
1044 frame fr = thread->last_frame(); | |
1045 while (fr.id() != id) { | |
1046 fr = fr.sender(®_map); | |
1047 } | |
1048 deoptimize(thread, fr, ®_map); | |
1049 } | |
1050 | |
1051 | |
1052 // JVMTI PopFrame support | |
1053 JRT_LEAF(void, Deoptimization::popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address)) | |
1054 { | |
1055 thread->popframe_preserve_args(in_ByteSize(bytes_to_save), start_address); | |
1056 } | |
1057 JRT_END | |
1058 | |
1059 | |
1060 #ifdef COMPILER2 | |
1061 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS) { | |
1062 // in case of an unresolved klass entry, load the class. | |
1063 if (constant_pool->tag_at(index).is_unresolved_klass()) { | |
1064 klassOop tk = constant_pool->klass_at(index, CHECK); | |
1065 return; | |
1066 } | |
1067 | |
1068 if (!constant_pool->tag_at(index).is_symbol()) return; | |
1069 | |
1070 Handle class_loader (THREAD, instanceKlass::cast(constant_pool->pool_holder())->class_loader()); | |
1071 symbolHandle symbol (THREAD, constant_pool->symbol_at(index)); | |
1072 | |
1073 // class name? | |
1074 if (symbol->byte_at(0) != '(') { | |
1075 Handle protection_domain (THREAD, Klass::cast(constant_pool->pool_holder())->protection_domain()); | |
1076 SystemDictionary::resolve_or_null(symbol, class_loader, protection_domain, CHECK); | |
1077 return; | |
1078 } | |
1079 | |
1080 // then it must be a signature! | |
1081 for (SignatureStream ss(symbol); !ss.is_done(); ss.next()) { | |
1082 if (ss.is_object()) { | |
1083 symbolOop s = ss.as_symbol(CHECK); | |
1084 symbolHandle class_name (THREAD, s); | |
1085 Handle protection_domain (THREAD, Klass::cast(constant_pool->pool_holder())->protection_domain()); | |
1086 SystemDictionary::resolve_or_null(class_name, class_loader, protection_domain, CHECK); | |
1087 } | |
1088 } | |
1089 } | |
1090 | |
1091 | |
1092 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) { | |
1093 EXCEPTION_MARK; | |
1094 load_class_by_index(constant_pool, index, THREAD); | |
1095 if (HAS_PENDING_EXCEPTION) { | |
1096 // Exception happened during classloading. We ignore the exception here, since it | |
1097 // is going to be rethrown since the current activation is going to be deoptimzied and | |
1098 // the interpreter will re-execute the bytecode. | |
1099 CLEAR_PENDING_EXCEPTION; | |
1100 } | |
1101 } | |
1102 | |
1103 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) { | |
1104 HandleMark hm; | |
1105 | |
1106 // uncommon_trap() is called at the beginning of the uncommon trap | |
1107 // handler. Note this fact before we start generating temporary frames | |
1108 // that can confuse an asynchronous stack walker. This counter is | |
1109 // decremented at the end of unpack_frames(). | |
1110 thread->inc_in_deopt_handler(); | |
1111 | |
1112 // We need to update the map if we have biased locking. | |
1113 RegisterMap reg_map(thread, UseBiasedLocking); | |
1114 frame stub_frame = thread->last_frame(); | |
1115 frame fr = stub_frame.sender(®_map); | |
1116 // Make sure the calling nmethod is not getting deoptimized and removed | |
1117 // before we are done with it. | |
1118 nmethodLocker nl(fr.pc()); | |
1119 | |
1120 { | |
1121 ResourceMark rm; | |
1122 | |
1123 // Revoke biases of any monitors in the frame to ensure we can migrate them | |
1124 revoke_biases_of_monitors(thread, fr, ®_map); | |
1125 | |
1126 DeoptReason reason = trap_request_reason(trap_request); | |
1127 DeoptAction action = trap_request_action(trap_request); | |
1128 jint unloaded_class_index = trap_request_index(trap_request); // CP idx or -1 | |
1129 | |
1130 Events::log("Uncommon trap occurred @" INTPTR_FORMAT " unloaded_class_index = %d", fr.pc(), (int) trap_request); | |
1131 vframe* vf = vframe::new_vframe(&fr, ®_map, thread); | |
1132 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1133 | |
1134 nmethod* nm = cvf->code(); | |
1135 | |
1136 ScopeDesc* trap_scope = cvf->scope(); | |
1137 methodHandle trap_method = trap_scope->method(); | |
1138 int trap_bci = trap_scope->bci(); | |
1139 Bytecodes::Code trap_bc = Bytecode_at(trap_method->bcp_from(trap_bci))->java_code(); | |
1140 | |
1141 // Record this event in the histogram. | |
1142 gather_statistics(reason, action, trap_bc); | |
1143 | |
1144 // Ensure that we can record deopt. history: | |
1145 bool create_if_missing = ProfileTraps; | |
1146 | |
1147 methodDataHandle trap_mdo | |
1148 (THREAD, get_method_data(thread, trap_method, create_if_missing)); | |
1149 | |
1150 // Print a bunch of diagnostics, if requested. | |
1151 if (TraceDeoptimization || LogCompilation) { | |
1152 ResourceMark rm; | |
1153 ttyLocker ttyl; | |
1154 char buf[100]; | |
1155 if (xtty != NULL) { | |
1156 xtty->begin_head("uncommon_trap thread='" UINTX_FORMAT"' %s", | |
1157 os::current_thread_id(), | |
1158 format_trap_request(buf, sizeof(buf), trap_request)); | |
1159 nm->log_identity(xtty); | |
1160 } | |
1161 symbolHandle class_name; | |
1162 bool unresolved = false; | |
1163 if (unloaded_class_index >= 0) { | |
1164 constantPoolHandle constants (THREAD, trap_method->constants()); | |
1165 if (constants->tag_at(unloaded_class_index).is_unresolved_klass()) { | |
1166 class_name = symbolHandle(THREAD, | |
1167 constants->klass_name_at(unloaded_class_index)); | |
1168 unresolved = true; | |
1169 if (xtty != NULL) | |
1170 xtty->print(" unresolved='1'"); | |
1171 } else if (constants->tag_at(unloaded_class_index).is_symbol()) { | |
1172 class_name = symbolHandle(THREAD, | |
1173 constants->symbol_at(unloaded_class_index)); | |
1174 } | |
1175 if (xtty != NULL) | |
1176 xtty->name(class_name); | |
1177 } | |
1178 if (xtty != NULL && trap_mdo.not_null()) { | |
1179 // Dump the relevant MDO state. | |
1180 // This is the deopt count for the current reason, any previous | |
1181 // reasons or recompiles seen at this point. | |
1182 int dcnt = trap_mdo->trap_count(reason); | |
1183 if (dcnt != 0) | |
1184 xtty->print(" count='%d'", dcnt); | |
1185 ProfileData* pdata = trap_mdo->bci_to_data(trap_bci); | |
1186 int dos = (pdata == NULL)? 0: pdata->trap_state(); | |
1187 if (dos != 0) { | |
1188 xtty->print(" state='%s'", format_trap_state(buf, sizeof(buf), dos)); | |
1189 if (trap_state_is_recompiled(dos)) { | |
1190 int recnt2 = trap_mdo->overflow_recompile_count(); | |
1191 if (recnt2 != 0) | |
1192 xtty->print(" recompiles2='%d'", recnt2); | |
1193 } | |
1194 } | |
1195 } | |
1196 if (xtty != NULL) { | |
1197 xtty->stamp(); | |
1198 xtty->end_head(); | |
1199 } | |
1200 if (TraceDeoptimization) { // make noise on the tty | |
1201 tty->print("Uncommon trap occurred in"); | |
1202 nm->method()->print_short_name(tty); | |
1203 tty->print(" (@" INTPTR_FORMAT ") thread=%d reason=%s action=%s unloaded_class_index=%d", | |
1204 fr.pc(), | |
1205 (int) os::current_thread_id(), | |
1206 trap_reason_name(reason), | |
1207 trap_action_name(action), | |
1208 unloaded_class_index); | |
1209 if (class_name.not_null()) { | |
1210 tty->print(unresolved ? " unresolved class: " : " symbol: "); | |
1211 class_name->print_symbol_on(tty); | |
1212 } | |
1213 tty->cr(); | |
1214 } | |
1215 if (xtty != NULL) { | |
1216 // Log the precise location of the trap. | |
1217 for (ScopeDesc* sd = trap_scope; ; sd = sd->sender()) { | |
1218 xtty->begin_elem("jvms bci='%d'", sd->bci()); | |
1219 xtty->method(sd->method()); | |
1220 xtty->end_elem(); | |
1221 if (sd->is_top()) break; | |
1222 } | |
1223 xtty->tail("uncommon_trap"); | |
1224 } | |
1225 } | |
1226 // (End diagnostic printout.) | |
1227 | |
1228 // Load class if necessary | |
1229 if (unloaded_class_index >= 0) { | |
1230 constantPoolHandle constants(THREAD, trap_method->constants()); | |
1231 load_class_by_index(constants, unloaded_class_index); | |
1232 } | |
1233 | |
1234 // Flush the nmethod if necessary and desirable. | |
1235 // | |
1236 // We need to avoid situations where we are re-flushing the nmethod | |
1237 // because of a hot deoptimization site. Repeated flushes at the same | |
1238 // point need to be detected by the compiler and avoided. If the compiler | |
1239 // cannot avoid them (or has a bug and "refuses" to avoid them), this | |
1240 // module must take measures to avoid an infinite cycle of recompilation | |
1241 // and deoptimization. There are several such measures: | |
1242 // | |
1243 // 1. If a recompilation is ordered a second time at some site X | |
1244 // and for the same reason R, the action is adjusted to 'reinterpret', | |
1245 // to give the interpreter time to exercise the method more thoroughly. | |
1246 // If this happens, the method's overflow_recompile_count is incremented. | |
1247 // | |
1248 // 2. If the compiler fails to reduce the deoptimization rate, then | |
1249 // the method's overflow_recompile_count will begin to exceed the set | |
1250 // limit PerBytecodeRecompilationCutoff. If this happens, the action | |
1251 // is adjusted to 'make_not_compilable', and the method is abandoned | |
1252 // to the interpreter. This is a performance hit for hot methods, | |
1253 // but is better than a disastrous infinite cycle of recompilations. | |
1254 // (Actually, only the method containing the site X is abandoned.) | |
1255 // | |
1256 // 3. In parallel with the previous measures, if the total number of | |
1257 // recompilations of a method exceeds the much larger set limit | |
1258 // PerMethodRecompilationCutoff, the method is abandoned. | |
1259 // This should only happen if the method is very large and has | |
1260 // many "lukewarm" deoptimizations. The code which enforces this | |
1261 // limit is elsewhere (class nmethod, class methodOopDesc). | |
1262 // | |
1263 // Note that the per-BCI 'is_recompiled' bit gives the compiler one chance | |
1264 // to recompile at each bytecode independently of the per-BCI cutoff. | |
1265 // | |
1266 // The decision to update code is up to the compiler, and is encoded | |
1267 // in the Action_xxx code. If the compiler requests Action_none | |
1268 // no trap state is changed, no compiled code is changed, and the | |
1269 // computation suffers along in the interpreter. | |
1270 // | |
1271 // The other action codes specify various tactics for decompilation | |
1272 // and recompilation. Action_maybe_recompile is the loosest, and | |
1273 // allows the compiled code to stay around until enough traps are seen, | |
1274 // and until the compiler gets around to recompiling the trapping method. | |
1275 // | |
1276 // The other actions cause immediate removal of the present code. | |
1277 | |
1278 bool update_trap_state = true; | |
1279 bool make_not_entrant = false; | |
1280 bool make_not_compilable = false; | |
1281 bool reset_counters = false; | |
1282 switch (action) { | |
1283 case Action_none: | |
1284 // Keep the old code. | |
1285 update_trap_state = false; | |
1286 break; | |
1287 case Action_maybe_recompile: | |
1288 // Do not need to invalidate the present code, but we can | |
1289 // initiate another | |
1290 // Start compiler without (necessarily) invalidating the nmethod. | |
1291 // The system will tolerate the old code, but new code should be | |
1292 // generated when possible. | |
1293 break; | |
1294 case Action_reinterpret: | |
1295 // Go back into the interpreter for a while, and then consider | |
1296 // recompiling form scratch. | |
1297 make_not_entrant = true; | |
1298 // Reset invocation counter for outer most method. | |
1299 // This will allow the interpreter to exercise the bytecodes | |
1300 // for a while before recompiling. | |
1301 // By contrast, Action_make_not_entrant is immediate. | |
1302 // | |
1303 // Note that the compiler will track null_check, null_assert, | |
1304 // range_check, and class_check events and log them as if they | |
1305 // had been traps taken from compiled code. This will update | |
1306 // the MDO trap history so that the next compilation will | |
1307 // properly detect hot trap sites. | |
1308 reset_counters = true; | |
1309 break; | |
1310 case Action_make_not_entrant: | |
1311 // Request immediate recompilation, and get rid of the old code. | |
1312 // Make them not entrant, so next time they are called they get | |
1313 // recompiled. Unloaded classes are loaded now so recompile before next | |
1314 // time they are called. Same for uninitialized. The interpreter will | |
1315 // link the missing class, if any. | |
1316 make_not_entrant = true; | |
1317 break; | |
1318 case Action_make_not_compilable: | |
1319 // Give up on compiling this method at all. | |
1320 make_not_entrant = true; | |
1321 make_not_compilable = true; | |
1322 break; | |
1323 default: | |
1324 ShouldNotReachHere(); | |
1325 } | |
1326 | |
1327 // Setting +ProfileTraps fixes the following, on all platforms: | |
1328 // 4852688: ProfileInterpreter is off by default for ia64. The result is | |
1329 // infinite heroic-opt-uncommon-trap/deopt/recompile cycles, since the | |
1330 // recompile relies on a methodDataOop to record heroic opt failures. | |
1331 | |
1332 // Whether the interpreter is producing MDO data or not, we also need | |
1333 // to use the MDO to detect hot deoptimization points and control | |
1334 // aggressive optimization. | |
1335 if (ProfileTraps && update_trap_state && trap_mdo.not_null()) { | |
1336 assert(trap_mdo() == get_method_data(thread, trap_method, false), "sanity"); | |
1337 uint this_trap_count = 0; | |
1338 bool maybe_prior_trap = false; | |
1339 bool maybe_prior_recompile = false; | |
1340 ProfileData* pdata | |
1341 = query_update_method_data(trap_mdo, trap_bci, reason, | |
1342 //outputs: | |
1343 this_trap_count, | |
1344 maybe_prior_trap, | |
1345 maybe_prior_recompile); | |
1346 // Because the interpreter also counts null, div0, range, and class | |
1347 // checks, these traps from compiled code are double-counted. | |
1348 // This is harmless; it just means that the PerXTrapLimit values | |
1349 // are in effect a little smaller than they look. | |
1350 | |
1351 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
1352 if (per_bc_reason != Reason_none) { | |
1353 // Now take action based on the partially known per-BCI history. | |
1354 if (maybe_prior_trap | |
1355 && this_trap_count >= (uint)PerBytecodeTrapLimit) { | |
1356 // If there are too many traps at this BCI, force a recompile. | |
1357 // This will allow the compiler to see the limit overflow, and | |
1358 // take corrective action, if possible. The compiler generally | |
1359 // does not use the exact PerBytecodeTrapLimit value, but instead | |
1360 // changes its tactics if it sees any traps at all. This provides | |
1361 // a little hysteresis, delaying a recompile until a trap happens | |
1362 // several times. | |
1363 // | |
1364 // Actually, since there is only one bit of counter per BCI, | |
1365 // the possible per-BCI counts are {0,1,(per-method count)}. | |
1366 // This produces accurate results if in fact there is only | |
1367 // one hot trap site, but begins to get fuzzy if there are | |
1368 // many sites. For example, if there are ten sites each | |
1369 // trapping two or more times, they each get the blame for | |
1370 // all of their traps. | |
1371 make_not_entrant = true; | |
1372 } | |
1373 | |
1374 // Detect repeated recompilation at the same BCI, and enforce a limit. | |
1375 if (make_not_entrant && maybe_prior_recompile) { | |
1376 // More than one recompile at this point. | |
1377 trap_mdo->inc_overflow_recompile_count(); | |
1378 if (maybe_prior_trap | |
1379 && ((uint)trap_mdo->overflow_recompile_count() | |
1380 > (uint)PerBytecodeRecompilationCutoff)) { | |
1381 // Give up on the method containing the bad BCI. | |
1382 if (trap_method() == nm->method()) { | |
1383 make_not_compilable = true; | |
1384 } else { | |
1385 trap_method->set_not_compilable(); | |
1386 // But give grace to the enclosing nm->method(). | |
1387 } | |
1388 } | |
1389 } | |
1390 } else { | |
1391 // For reasons which are not recorded per-bytecode, we simply | |
1392 // force recompiles unconditionally. | |
1393 // (Note that PerMethodRecompilationCutoff is enforced elsewhere.) | |
1394 make_not_entrant = true; | |
1395 } | |
1396 | |
1397 // Go back to the compiler if there are too many traps in this method. | |
1398 if (this_trap_count >= (uint)PerMethodTrapLimit) { | |
1399 // If there are too many traps in this method, force a recompile. | |
1400 // This will allow the compiler to see the limit overflow, and | |
1401 // take corrective action, if possible. | |
1402 // (This condition is an unlikely backstop only, because the | |
1403 // PerBytecodeTrapLimit is more likely to take effect first, | |
1404 // if it is applicable.) | |
1405 make_not_entrant = true; | |
1406 } | |
1407 | |
1408 // Here's more hysteresis: If there has been a recompile at | |
1409 // this trap point already, run the method in the interpreter | |
1410 // for a while to exercise it more thoroughly. | |
1411 if (make_not_entrant && maybe_prior_recompile && maybe_prior_trap) { | |
1412 reset_counters = true; | |
1413 } | |
1414 | |
1415 if (make_not_entrant && pdata != NULL) { | |
1416 // Record the recompilation event, if any. | |
1417 int tstate0 = pdata->trap_state(); | |
1418 int tstate1 = trap_state_set_recompiled(tstate0, true); | |
1419 if (tstate1 != tstate0) | |
1420 pdata->set_trap_state(tstate1); | |
1421 } | |
1422 } | |
1423 | |
1424 // Take requested actions on the method: | |
1425 | |
1426 // Reset invocation counters | |
1427 if (reset_counters) { | |
1428 if (nm->is_osr_method()) | |
1429 reset_invocation_counter(trap_scope, CompileThreshold); | |
1430 else | |
1431 reset_invocation_counter(trap_scope); | |
1432 } | |
1433 | |
1434 // Recompile | |
1435 if (make_not_entrant) { | |
1436 nm->make_not_entrant(); | |
1437 } | |
1438 | |
1439 // Give up compiling | |
1440 if (make_not_compilable) { | |
1441 assert(make_not_entrant, "consistent"); | |
1442 nm->method()->set_not_compilable(); | |
1443 } | |
1444 | |
1445 } // Free marked resources | |
1446 | |
1447 } | |
1448 JRT_END | |
1449 | |
1450 methodDataOop | |
1451 Deoptimization::get_method_data(JavaThread* thread, methodHandle m, | |
1452 bool create_if_missing) { | |
1453 Thread* THREAD = thread; | |
1454 methodDataOop mdo = m()->method_data(); | |
1455 if (mdo == NULL && create_if_missing && !HAS_PENDING_EXCEPTION) { | |
1456 // Build an MDO. Ignore errors like OutOfMemory; | |
1457 // that simply means we won't have an MDO to update. | |
1458 methodOopDesc::build_interpreter_method_data(m, THREAD); | |
1459 if (HAS_PENDING_EXCEPTION) { | |
1460 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); | |
1461 CLEAR_PENDING_EXCEPTION; | |
1462 } | |
1463 mdo = m()->method_data(); | |
1464 } | |
1465 return mdo; | |
1466 } | |
1467 | |
1468 ProfileData* | |
1469 Deoptimization::query_update_method_data(methodDataHandle trap_mdo, | |
1470 int trap_bci, | |
1471 Deoptimization::DeoptReason reason, | |
1472 //outputs: | |
1473 uint& ret_this_trap_count, | |
1474 bool& ret_maybe_prior_trap, | |
1475 bool& ret_maybe_prior_recompile) { | |
1476 uint prior_trap_count = trap_mdo->trap_count(reason); | |
1477 uint this_trap_count = trap_mdo->inc_trap_count(reason); | |
1478 | |
1479 // If the runtime cannot find a place to store trap history, | |
1480 // it is estimated based on the general condition of the method. | |
1481 // If the method has ever been recompiled, or has ever incurred | |
1482 // a trap with the present reason , then this BCI is assumed | |
1483 // (pessimistically) to be the culprit. | |
1484 bool maybe_prior_trap = (prior_trap_count != 0); | |
1485 bool maybe_prior_recompile = (trap_mdo->decompile_count() != 0); | |
1486 ProfileData* pdata = NULL; | |
1487 | |
1488 | |
1489 // For reasons which are recorded per bytecode, we check per-BCI data. | |
1490 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
1491 if (per_bc_reason != Reason_none) { | |
1492 // Find the profile data for this BCI. If there isn't one, | |
1493 // try to allocate one from the MDO's set of spares. | |
1494 // This will let us detect a repeated trap at this point. | |
1495 pdata = trap_mdo->allocate_bci_to_data(trap_bci); | |
1496 | |
1497 if (pdata != NULL) { | |
1498 // Query the trap state of this profile datum. | |
1499 int tstate0 = pdata->trap_state(); | |
1500 if (!trap_state_has_reason(tstate0, per_bc_reason)) | |
1501 maybe_prior_trap = false; | |
1502 if (!trap_state_is_recompiled(tstate0)) | |
1503 maybe_prior_recompile = false; | |
1504 | |
1505 // Update the trap state of this profile datum. | |
1506 int tstate1 = tstate0; | |
1507 // Record the reason. | |
1508 tstate1 = trap_state_add_reason(tstate1, per_bc_reason); | |
1509 // Store the updated state on the MDO, for next time. | |
1510 if (tstate1 != tstate0) | |
1511 pdata->set_trap_state(tstate1); | |
1512 } else { | |
1513 if (LogCompilation && xtty != NULL) | |
1514 // Missing MDP? Leave a small complaint in the log. | |
1515 xtty->elem("missing_mdp bci='%d'", trap_bci); | |
1516 } | |
1517 } | |
1518 | |
1519 // Return results: | |
1520 ret_this_trap_count = this_trap_count; | |
1521 ret_maybe_prior_trap = maybe_prior_trap; | |
1522 ret_maybe_prior_recompile = maybe_prior_recompile; | |
1523 return pdata; | |
1524 } | |
1525 | |
1526 void | |
1527 Deoptimization::update_method_data_from_interpreter(methodDataHandle trap_mdo, int trap_bci, int reason) { | |
1528 ResourceMark rm; | |
1529 // Ignored outputs: | |
1530 uint ignore_this_trap_count; | |
1531 bool ignore_maybe_prior_trap; | |
1532 bool ignore_maybe_prior_recompile; | |
1533 query_update_method_data(trap_mdo, trap_bci, | |
1534 (DeoptReason)reason, | |
1535 ignore_this_trap_count, | |
1536 ignore_maybe_prior_trap, | |
1537 ignore_maybe_prior_recompile); | |
1538 } | |
1539 | |
1540 void Deoptimization::reset_invocation_counter(ScopeDesc* trap_scope, jint top_count) { | |
1541 ScopeDesc* sd = trap_scope; | |
1542 for (; !sd->is_top(); sd = sd->sender()) { | |
1543 // Reset ICs of inlined methods, since they can trigger compilations also. | |
1544 sd->method()->invocation_counter()->reset(); | |
1545 } | |
1546 InvocationCounter* c = sd->method()->invocation_counter(); | |
1547 if (top_count != _no_count) { | |
1548 // It was an OSR method, so bump the count higher. | |
1549 c->set(c->state(), top_count); | |
1550 } else { | |
1551 c->reset(); | |
1552 } | |
1553 sd->method()->backedge_counter()->reset(); | |
1554 } | |
1555 | |
1556 Deoptimization::UnrollBlock* Deoptimization::uncommon_trap(JavaThread* thread, jint trap_request) { | |
1557 | |
1558 // Still in Java no safepoints | |
1559 { | |
1560 // This enters VM and may safepoint | |
1561 uncommon_trap_inner(thread, trap_request); | |
1562 } | |
1563 return fetch_unroll_info_helper(thread); | |
1564 } | |
1565 | |
1566 // Local derived constants. | |
1567 // Further breakdown of DataLayout::trap_state, as promised by DataLayout. | |
1568 const int DS_REASON_MASK = DataLayout::trap_mask >> 1; | |
1569 const int DS_RECOMPILE_BIT = DataLayout::trap_mask - DS_REASON_MASK; | |
1570 | |
1571 //---------------------------trap_state_reason--------------------------------- | |
1572 Deoptimization::DeoptReason | |
1573 Deoptimization::trap_state_reason(int trap_state) { | |
1574 // This assert provides the link between the width of DataLayout::trap_bits | |
1575 // and the encoding of "recorded" reasons. It ensures there are enough | |
1576 // bits to store all needed reasons in the per-BCI MDO profile. | |
1577 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
1578 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1579 trap_state -= recompile_bit; | |
1580 if (trap_state == DS_REASON_MASK) { | |
1581 return Reason_many; | |
1582 } else { | |
1583 assert((int)Reason_none == 0, "state=0 => Reason_none"); | |
1584 return (DeoptReason)trap_state; | |
1585 } | |
1586 } | |
1587 //-------------------------trap_state_has_reason------------------------------- | |
1588 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
1589 assert(reason_is_recorded_per_bytecode((DeoptReason)reason), "valid reason"); | |
1590 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
1591 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1592 trap_state -= recompile_bit; | |
1593 if (trap_state == DS_REASON_MASK) { | |
1594 return -1; // true, unspecifically (bottom of state lattice) | |
1595 } else if (trap_state == reason) { | |
1596 return 1; // true, definitely | |
1597 } else if (trap_state == 0) { | |
1598 return 0; // false, definitely (top of state lattice) | |
1599 } else { | |
1600 return 0; // false, definitely | |
1601 } | |
1602 } | |
1603 //-------------------------trap_state_add_reason------------------------------- | |
1604 int Deoptimization::trap_state_add_reason(int trap_state, int reason) { | |
1605 assert(reason_is_recorded_per_bytecode((DeoptReason)reason) || reason == Reason_many, "valid reason"); | |
1606 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1607 trap_state -= recompile_bit; | |
1608 if (trap_state == DS_REASON_MASK) { | |
1609 return trap_state + recompile_bit; // already at state lattice bottom | |
1610 } else if (trap_state == reason) { | |
1611 return trap_state + recompile_bit; // the condition is already true | |
1612 } else if (trap_state == 0) { | |
1613 return reason + recompile_bit; // no condition has yet been true | |
1614 } else { | |
1615 return DS_REASON_MASK + recompile_bit; // fall to state lattice bottom | |
1616 } | |
1617 } | |
1618 //-----------------------trap_state_is_recompiled------------------------------ | |
1619 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
1620 return (trap_state & DS_RECOMPILE_BIT) != 0; | |
1621 } | |
1622 //-----------------------trap_state_set_recompiled----------------------------- | |
1623 int Deoptimization::trap_state_set_recompiled(int trap_state, bool z) { | |
1624 if (z) return trap_state | DS_RECOMPILE_BIT; | |
1625 else return trap_state & ~DS_RECOMPILE_BIT; | |
1626 } | |
1627 //---------------------------format_trap_state--------------------------------- | |
1628 // This is used for debugging and diagnostics, including hotspot.log output. | |
1629 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
1630 int trap_state) { | |
1631 DeoptReason reason = trap_state_reason(trap_state); | |
1632 bool recomp_flag = trap_state_is_recompiled(trap_state); | |
1633 // Re-encode the state from its decoded components. | |
1634 int decoded_state = 0; | |
1635 if (reason_is_recorded_per_bytecode(reason) || reason == Reason_many) | |
1636 decoded_state = trap_state_add_reason(decoded_state, reason); | |
1637 if (recomp_flag) | |
1638 decoded_state = trap_state_set_recompiled(decoded_state, recomp_flag); | |
1639 // If the state re-encodes properly, format it symbolically. | |
1640 // Because this routine is used for debugging and diagnostics, | |
1641 // be robust even if the state is a strange value. | |
1642 size_t len; | |
1643 if (decoded_state != trap_state) { | |
1644 // Random buggy state that doesn't decode?? | |
1645 len = jio_snprintf(buf, buflen, "#%d", trap_state); | |
1646 } else { | |
1647 len = jio_snprintf(buf, buflen, "%s%s", | |
1648 trap_reason_name(reason), | |
1649 recomp_flag ? " recompiled" : ""); | |
1650 } | |
1651 if (len >= buflen) | |
1652 buf[buflen-1] = '\0'; | |
1653 return buf; | |
1654 } | |
1655 | |
1656 | |
1657 //--------------------------------statics-------------------------------------- | |
1658 Deoptimization::DeoptAction Deoptimization::_unloaded_action | |
1659 = Deoptimization::Action_reinterpret; | |
1660 const char* Deoptimization::_trap_reason_name[Reason_LIMIT] = { | |
1661 // Note: Keep this in sync. with enum DeoptReason. | |
1662 "none", | |
1663 "null_check", | |
1664 "null_assert", | |
1665 "range_check", | |
1666 "class_check", | |
1667 "array_check", | |
1668 "intrinsic", | |
1669 "unloaded", | |
1670 "uninitialized", | |
1671 "unreached", | |
1672 "unhandled", | |
1673 "constraint", | |
1674 "div0_check", | |
1172 | 1675 "age", |
1676 "predicate" | |
0 | 1677 }; |
1678 const char* Deoptimization::_trap_action_name[Action_LIMIT] = { | |
1679 // Note: Keep this in sync. with enum DeoptAction. | |
1680 "none", | |
1681 "maybe_recompile", | |
1682 "reinterpret", | |
1683 "make_not_entrant", | |
1684 "make_not_compilable" | |
1685 }; | |
1686 | |
1687 const char* Deoptimization::trap_reason_name(int reason) { | |
1688 if (reason == Reason_many) return "many"; | |
1689 if ((uint)reason < Reason_LIMIT) | |
1690 return _trap_reason_name[reason]; | |
1691 static char buf[20]; | |
1692 sprintf(buf, "reason%d", reason); | |
1693 return buf; | |
1694 } | |
1695 const char* Deoptimization::trap_action_name(int action) { | |
1696 if ((uint)action < Action_LIMIT) | |
1697 return _trap_action_name[action]; | |
1698 static char buf[20]; | |
1699 sprintf(buf, "action%d", action); | |
1700 return buf; | |
1701 } | |
1702 | |
1703 // This is used for debugging and diagnostics, including hotspot.log output. | |
1704 const char* Deoptimization::format_trap_request(char* buf, size_t buflen, | |
1705 int trap_request) { | |
1706 jint unloaded_class_index = trap_request_index(trap_request); | |
1707 const char* reason = trap_reason_name(trap_request_reason(trap_request)); | |
1708 const char* action = trap_action_name(trap_request_action(trap_request)); | |
1709 size_t len; | |
1710 if (unloaded_class_index < 0) { | |
1711 len = jio_snprintf(buf, buflen, "reason='%s' action='%s'", | |
1712 reason, action); | |
1713 } else { | |
1714 len = jio_snprintf(buf, buflen, "reason='%s' action='%s' index='%d'", | |
1715 reason, action, unloaded_class_index); | |
1716 } | |
1717 if (len >= buflen) | |
1718 buf[buflen-1] = '\0'; | |
1719 return buf; | |
1720 } | |
1721 | |
1722 juint Deoptimization::_deoptimization_hist | |
1723 [Deoptimization::Reason_LIMIT] | |
1724 [1 + Deoptimization::Action_LIMIT] | |
1725 [Deoptimization::BC_CASE_LIMIT] | |
1726 = {0}; | |
1727 | |
1728 enum { | |
1729 LSB_BITS = 8, | |
1730 LSB_MASK = right_n_bits(LSB_BITS) | |
1731 }; | |
1732 | |
1733 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
1734 Bytecodes::Code bc) { | |
1735 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
1736 assert(action >= 0 && action < Action_LIMIT, "oob"); | |
1737 _deoptimization_hist[Reason_none][0][0] += 1; // total | |
1738 _deoptimization_hist[reason][0][0] += 1; // per-reason total | |
1739 juint* cases = _deoptimization_hist[reason][1+action]; | |
1740 juint* bc_counter_addr = NULL; | |
1741 juint bc_counter = 0; | |
1742 // Look for an unused counter, or an exact match to this BC. | |
1743 if (bc != Bytecodes::_illegal) { | |
1744 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
1745 juint* counter_addr = &cases[bc_case]; | |
1746 juint counter = *counter_addr; | |
1747 if ((counter == 0 && bc_counter_addr == NULL) | |
1748 || (Bytecodes::Code)(counter & LSB_MASK) == bc) { | |
1749 // this counter is either free or is already devoted to this BC | |
1750 bc_counter_addr = counter_addr; | |
1751 bc_counter = counter | bc; | |
1752 } | |
1753 } | |
1754 } | |
1755 if (bc_counter_addr == NULL) { | |
1756 // Overflow, or no given bytecode. | |
1757 bc_counter_addr = &cases[BC_CASE_LIMIT-1]; | |
1758 bc_counter = (*bc_counter_addr & ~LSB_MASK); // clear LSB | |
1759 } | |
1760 *bc_counter_addr = bc_counter + (1 << LSB_BITS); | |
1761 } | |
1762 | |
1763 jint Deoptimization::total_deoptimization_count() { | |
1764 return _deoptimization_hist[Reason_none][0][0]; | |
1765 } | |
1766 | |
1767 jint Deoptimization::deoptimization_count(DeoptReason reason) { | |
1768 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
1769 return _deoptimization_hist[reason][0][0]; | |
1770 } | |
1771 | |
1772 void Deoptimization::print_statistics() { | |
1773 juint total = total_deoptimization_count(); | |
1774 juint account = total; | |
1775 if (total != 0) { | |
1776 ttyLocker ttyl; | |
1777 if (xtty != NULL) xtty->head("statistics type='deoptimization'"); | |
1778 tty->print_cr("Deoptimization traps recorded:"); | |
1779 #define PRINT_STAT_LINE(name, r) \ | |
1780 tty->print_cr(" %4d (%4.1f%%) %s", (int)(r), ((r) * 100.0) / total, name); | |
1781 PRINT_STAT_LINE("total", total); | |
1782 // For each non-zero entry in the histogram, print the reason, | |
1783 // the action, and (if specifically known) the type of bytecode. | |
1784 for (int reason = 0; reason < Reason_LIMIT; reason++) { | |
1785 for (int action = 0; action < Action_LIMIT; action++) { | |
1786 juint* cases = _deoptimization_hist[reason][1+action]; | |
1787 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
1788 juint counter = cases[bc_case]; | |
1789 if (counter != 0) { | |
1790 char name[1*K]; | |
1791 Bytecodes::Code bc = (Bytecodes::Code)(counter & LSB_MASK); | |
1792 if (bc_case == BC_CASE_LIMIT && (int)bc == 0) | |
1793 bc = Bytecodes::_illegal; | |
1794 sprintf(name, "%s/%s/%s", | |
1795 trap_reason_name(reason), | |
1796 trap_action_name(action), | |
1797 Bytecodes::is_defined(bc)? Bytecodes::name(bc): "other"); | |
1798 juint r = counter >> LSB_BITS; | |
1799 tty->print_cr(" %40s: " UINT32_FORMAT " (%.1f%%)", name, r, (r * 100.0) / total); | |
1800 account -= r; | |
1801 } | |
1802 } | |
1803 } | |
1804 } | |
1805 if (account != 0) { | |
1806 PRINT_STAT_LINE("unaccounted", account); | |
1807 } | |
1808 #undef PRINT_STAT_LINE | |
1809 if (xtty != NULL) xtty->tail("statistics"); | |
1810 } | |
1811 } | |
1812 #else // COMPILER2 | |
1813 | |
1814 | |
1815 // Stubs for C1 only system. | |
1816 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
1817 return false; | |
1818 } | |
1819 | |
1820 const char* Deoptimization::trap_reason_name(int reason) { | |
1821 return "unknown"; | |
1822 } | |
1823 | |
1824 void Deoptimization::print_statistics() { | |
1825 // no output | |
1826 } | |
1827 | |
1828 void | |
1829 Deoptimization::update_method_data_from_interpreter(methodDataHandle trap_mdo, int trap_bci, int reason) { | |
1830 // no udpate | |
1831 } | |
1832 | |
1833 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
1834 return 0; | |
1835 } | |
1836 | |
1837 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
1838 Bytecodes::Code bc) { | |
1839 // no update | |
1840 } | |
1841 | |
1842 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
1843 int trap_state) { | |
1844 jio_snprintf(buf, buflen, "#%d", trap_state); | |
1845 return buf; | |
1846 } | |
1847 | |
1848 #endif // COMPILER2 |