Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.cpp @ 14391:d2907f74462e
8016586: PPC64 (part 3): basic changes for PPC64
Summary: added #includes needed for ppc64 port. Renamed _MODEL_ppc to _MODEL_ppc_32 and renamed corresponding old _ppc files to _ppc_32.
Reviewed-by: dholmes, kvn
author | goetz |
---|---|
date | Thu, 20 Jun 2013 16:30:44 -0700 |
parents | 0094485b46c7 |
children | b5c8a61d7fa0 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "code/debugInfoRec.hpp" | |
28 #include "code/nmethod.hpp" | |
29 #include "code/pcDesc.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "interpreter/bytecode.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/oopMapCache.hpp" | |
34 #include "memory/allocation.inline.hpp" | |
35 #include "memory/oopFactory.hpp" | |
36 #include "memory/resourceArea.hpp" | |
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37 #include "oops/method.hpp" |
1972 | 38 #include "oops/oop.inline.hpp" |
39 #include "prims/jvmtiThreadState.hpp" | |
40 #include "runtime/biasedLocking.hpp" | |
41 #include "runtime/compilationPolicy.hpp" | |
42 #include "runtime/deoptimization.hpp" | |
43 #include "runtime/interfaceSupport.hpp" | |
44 #include "runtime/sharedRuntime.hpp" | |
45 #include "runtime/signature.hpp" | |
46 #include "runtime/stubRoutines.hpp" | |
47 #include "runtime/thread.hpp" | |
48 #include "runtime/vframe.hpp" | |
49 #include "runtime/vframeArray.hpp" | |
50 #include "runtime/vframe_hp.hpp" | |
51 #include "utilities/events.hpp" | |
52 #include "utilities/xmlstream.hpp" | |
53 #ifdef TARGET_ARCH_x86 | |
54 # include "vmreg_x86.inline.hpp" | |
55 #endif | |
56 #ifdef TARGET_ARCH_sparc | |
57 # include "vmreg_sparc.inline.hpp" | |
58 #endif | |
59 #ifdef TARGET_ARCH_zero | |
60 # include "vmreg_zero.inline.hpp" | |
61 #endif | |
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62 #ifdef TARGET_ARCH_arm |
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63 # include "vmreg_arm.inline.hpp" |
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64 #endif |
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65 #ifdef TARGET_ARCH_ppc |
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66 # include "vmreg_ppc.inline.hpp" |
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67 #endif |
1972 | 68 #ifdef COMPILER2 |
69 #ifdef TARGET_ARCH_MODEL_x86_32 | |
70 # include "adfiles/ad_x86_32.hpp" | |
71 #endif | |
72 #ifdef TARGET_ARCH_MODEL_x86_64 | |
73 # include "adfiles/ad_x86_64.hpp" | |
74 #endif | |
75 #ifdef TARGET_ARCH_MODEL_sparc | |
76 # include "adfiles/ad_sparc.hpp" | |
77 #endif | |
78 #ifdef TARGET_ARCH_MODEL_zero | |
79 # include "adfiles/ad_zero.hpp" | |
80 #endif | |
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81 #ifdef TARGET_ARCH_MODEL_arm |
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82 # include "adfiles/ad_arm.hpp" |
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83 #endif |
14391 | 84 #ifdef TARGET_ARCH_MODEL_ppc_32 |
85 # include "adfiles/ad_ppc_32.hpp" | |
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86 #endif |
14391 | 87 #ifdef TARGET_ARCH_MODEL_ppc_64 |
88 # include "adfiles/ad_ppc_64.hpp" | |
1972 | 89 #endif |
14391 | 90 #endif // COMPILER2 |
0 | 91 |
92 bool DeoptimizationMarker::_is_active = false; | |
93 | |
94 Deoptimization::UnrollBlock::UnrollBlock(int size_of_deoptimized_frame, | |
95 int caller_adjustment, | |
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96 int caller_actual_parameters, |
0 | 97 int number_of_frames, |
98 intptr_t* frame_sizes, | |
99 address* frame_pcs, | |
100 BasicType return_type) { | |
101 _size_of_deoptimized_frame = size_of_deoptimized_frame; | |
102 _caller_adjustment = caller_adjustment; | |
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103 _caller_actual_parameters = caller_actual_parameters; |
0 | 104 _number_of_frames = number_of_frames; |
105 _frame_sizes = frame_sizes; | |
106 _frame_pcs = frame_pcs; | |
6197 | 107 _register_block = NEW_C_HEAP_ARRAY(intptr_t, RegisterMap::reg_count * 2, mtCompiler); |
0 | 108 _return_type = return_type; |
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109 _initial_info = 0; |
0 | 110 // PD (x86 only) |
111 _counter_temp = 0; | |
112 _unpack_kind = 0; | |
113 _sender_sp_temp = 0; | |
114 | |
115 _total_frame_sizes = size_of_frames(); | |
116 } | |
117 | |
118 | |
119 Deoptimization::UnrollBlock::~UnrollBlock() { | |
6197 | 120 FREE_C_HEAP_ARRAY(intptr_t, _frame_sizes, mtCompiler); |
121 FREE_C_HEAP_ARRAY(intptr_t, _frame_pcs, mtCompiler); | |
122 FREE_C_HEAP_ARRAY(intptr_t, _register_block, mtCompiler); | |
0 | 123 } |
124 | |
125 | |
126 intptr_t* Deoptimization::UnrollBlock::value_addr_at(int register_number) const { | |
127 assert(register_number < RegisterMap::reg_count, "checking register number"); | |
128 return &_register_block[register_number * 2]; | |
129 } | |
130 | |
131 | |
132 | |
133 int Deoptimization::UnrollBlock::size_of_frames() const { | |
134 // Acount first for the adjustment of the initial frame | |
135 int result = _caller_adjustment; | |
136 for (int index = 0; index < number_of_frames(); index++) { | |
137 result += frame_sizes()[index]; | |
138 } | |
139 return result; | |
140 } | |
141 | |
142 | |
143 void Deoptimization::UnrollBlock::print() { | |
144 ttyLocker ttyl; | |
145 tty->print_cr("UnrollBlock"); | |
146 tty->print_cr(" size_of_deoptimized_frame = %d", _size_of_deoptimized_frame); | |
147 tty->print( " frame_sizes: "); | |
148 for (int index = 0; index < number_of_frames(); index++) { | |
149 tty->print("%d ", frame_sizes()[index]); | |
150 } | |
151 tty->cr(); | |
152 } | |
153 | |
154 | |
155 // In order to make fetch_unroll_info work properly with escape | |
156 // analysis, The method was changed from JRT_LEAF to JRT_BLOCK_ENTRY and | |
157 // ResetNoHandleMark and HandleMark were removed from it. The actual reallocation | |
158 // of previously eliminated objects occurs in realloc_objects, which is | |
159 // called from the method fetch_unroll_info_helper below. | |
160 JRT_BLOCK_ENTRY(Deoptimization::UnrollBlock*, Deoptimization::fetch_unroll_info(JavaThread* thread)) | |
161 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
162 // but makes the entry a little slower. There is however a little dance we have to | |
163 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
164 | |
165 // fetch_unroll_info() is called at the beginning of the deoptimization | |
166 // handler. Note this fact before we start generating temporary frames | |
167 // that can confuse an asynchronous stack walker. This counter is | |
168 // decremented at the end of unpack_frames(). | |
169 thread->inc_in_deopt_handler(); | |
170 | |
171 return fetch_unroll_info_helper(thread); | |
172 JRT_END | |
173 | |
174 | |
175 // This is factored, since it is both called from a JRT_LEAF (deoptimization) and a JRT_ENTRY (uncommon_trap) | |
176 Deoptimization::UnrollBlock* Deoptimization::fetch_unroll_info_helper(JavaThread* thread) { | |
177 | |
178 // Note: there is a safepoint safety issue here. No matter whether we enter | |
179 // via vanilla deopt or uncommon trap we MUST NOT stop at a safepoint once | |
180 // the vframeArray is created. | |
181 // | |
182 | |
183 // Allocate our special deoptimization ResourceMark | |
184 DeoptResourceMark* dmark = new DeoptResourceMark(thread); | |
185 assert(thread->deopt_mark() == NULL, "Pending deopt!"); | |
186 thread->set_deopt_mark(dmark); | |
187 | |
188 frame stub_frame = thread->last_frame(); // Makes stack walkable as side effect | |
189 RegisterMap map(thread, true); | |
190 RegisterMap dummy_map(thread, false); | |
191 // Now get the deoptee with a valid map | |
192 frame deoptee = stub_frame.sender(&map); | |
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193 // Set the deoptee nmethod |
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194 assert(thread->deopt_nmethod() == NULL, "Pending deopt!"); |
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195 thread->set_deopt_nmethod(deoptee.cb()->as_nmethod_or_null()); |
0 | 196 |
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197 if (VerifyStack) { |
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198 thread->validate_frame_layout(); |
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199 } |
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200 |
0 | 201 // Create a growable array of VFrames where each VFrame represents an inlined |
202 // Java frame. This storage is allocated with the usual system arena. | |
203 assert(deoptee.is_compiled_frame(), "Wrong frame type"); | |
204 GrowableArray<compiledVFrame*>* chunk = new GrowableArray<compiledVFrame*>(10); | |
205 vframe* vf = vframe::new_vframe(&deoptee, &map, thread); | |
206 while (!vf->is_top()) { | |
207 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
208 chunk->push(compiledVFrame::cast(vf)); | |
209 vf = vf->sender(); | |
210 } | |
211 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
212 chunk->push(compiledVFrame::cast(vf)); | |
213 | |
214 #ifdef COMPILER2 | |
215 // Reallocate the non-escaping objects and restore their fields. Then | |
216 // relock objects if synchronization on them was eliminated. | |
4777 | 217 if (DoEscapeAnalysis || EliminateNestedLocks) { |
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218 if (EliminateAllocations) { |
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219 assert (chunk->at(0)->scope() != NULL,"expect only compiled java frames"); |
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220 GrowableArray<ScopeValue*>* objects = chunk->at(0)->scope()->objects(); |
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221 |
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222 // The flag return_oop() indicates call sites which return oop |
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223 // in compiled code. Such sites include java method calls, |
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224 // runtime calls (for example, used to allocate new objects/arrays |
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225 // on slow code path) and any other calls generated in compiled code. |
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226 // It is not guaranteed that we can get such information here only |
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227 // by analyzing bytecode in deoptimized frames. This is why this flag |
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228 // is set during method compilation (see Compile::Process_OopMap_Node()). |
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229 bool save_oop_result = chunk->at(0)->scope()->return_oop(); |
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230 Handle return_value; |
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231 if (save_oop_result) { |
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232 // Reallocation may trigger GC. If deoptimization happened on return from |
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233 // call which returns oop we need to save it since it is not in oopmap. |
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234 oop result = deoptee.saved_oop_result(&map); |
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235 assert(result == NULL || result->is_oop(), "must be oop"); |
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236 return_value = Handle(thread, result); |
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237 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); |
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238 if (TraceDeoptimization) { |
6843 | 239 ttyLocker ttyl; |
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240 tty->print_cr("SAVED OOP RESULT " INTPTR_FORMAT " in thread " INTPTR_FORMAT, result, thread); |
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241 } |
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242 } |
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243 bool reallocated = false; |
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244 if (objects != NULL) { |
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245 JRT_BLOCK |
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246 reallocated = realloc_objects(thread, &deoptee, objects, THREAD); |
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247 JRT_END |
0 | 248 } |
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249 if (reallocated) { |
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250 reassign_fields(&deoptee, &map, objects); |
0 | 251 #ifndef PRODUCT |
252 if (TraceDeoptimization) { | |
253 ttyLocker ttyl; | |
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254 tty->print_cr("REALLOC OBJECTS in thread " INTPTR_FORMAT, thread); |
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255 print_objects(objects); |
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256 } |
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257 #endif |
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258 } |
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259 if (save_oop_result) { |
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260 // Restore result. |
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261 deoptee.set_saved_oop_result(&map, return_value()); |
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262 } |
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263 } |
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264 if (EliminateLocks) { |
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265 #ifndef PRODUCT |
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266 bool first = true; |
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267 #endif |
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268 for (int i = 0; i < chunk->length(); i++) { |
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269 compiledVFrame* cvf = chunk->at(i); |
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270 assert (cvf->scope() != NULL,"expect only compiled java frames"); |
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271 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); |
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272 if (monitors->is_nonempty()) { |
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273 relock_objects(monitors, thread); |
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274 #ifndef PRODUCT |
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275 if (TraceDeoptimization) { |
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276 ttyLocker ttyl; |
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277 for (int j = 0; j < monitors->length(); j++) { |
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278 MonitorInfo* mi = monitors->at(j); |
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279 if (mi->eliminated()) { |
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280 if (first) { |
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281 first = false; |
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282 tty->print_cr("RELOCK OBJECTS in thread " INTPTR_FORMAT, thread); |
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283 } |
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284 tty->print_cr(" object <" INTPTR_FORMAT "> locked", mi->owner()); |
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285 } |
0 | 286 } |
287 } | |
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288 #endif |
0 | 289 } |
290 } | |
291 } | |
292 } | |
293 #endif // COMPILER2 | |
294 // Ensure that no safepoint is taken after pointers have been stored | |
295 // in fields of rematerialized objects. If a safepoint occurs from here on | |
296 // out the java state residing in the vframeArray will be missed. | |
297 No_Safepoint_Verifier no_safepoint; | |
298 | |
299 vframeArray* array = create_vframeArray(thread, deoptee, &map, chunk); | |
300 | |
301 assert(thread->vframe_array_head() == NULL, "Pending deopt!");; | |
302 thread->set_vframe_array_head(array); | |
303 | |
304 // Now that the vframeArray has been created if we have any deferred local writes | |
305 // added by jvmti then we can free up that structure as the data is now in the | |
306 // vframeArray | |
307 | |
308 if (thread->deferred_locals() != NULL) { | |
309 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread->deferred_locals(); | |
310 int i = 0; | |
311 do { | |
312 // Because of inlining we could have multiple vframes for a single frame | |
313 // and several of the vframes could have deferred writes. Find them all. | |
314 if (list->at(i)->id() == array->original().id()) { | |
315 jvmtiDeferredLocalVariableSet* dlv = list->at(i); | |
316 list->remove_at(i); | |
317 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
318 delete dlv; | |
319 } else { | |
320 i++; | |
321 } | |
322 } while ( i < list->length() ); | |
323 if (list->length() == 0) { | |
324 thread->set_deferred_locals(NULL); | |
325 // free the list and elements back to C heap. | |
326 delete list; | |
327 } | |
328 | |
329 } | |
330 | |
1692 | 331 #ifndef SHARK |
0 | 332 // Compute the caller frame based on the sender sp of stub_frame and stored frame sizes info. |
333 CodeBlob* cb = stub_frame.cb(); | |
334 // Verify we have the right vframeArray | |
335 assert(cb->frame_size() >= 0, "Unexpected frame size"); | |
336 intptr_t* unpack_sp = stub_frame.sp() + cb->frame_size(); | |
337 | |
1204 | 338 // If the deopt call site is a MethodHandle invoke call site we have |
339 // to adjust the unpack_sp. | |
340 nmethod* deoptee_nm = deoptee.cb()->as_nmethod_or_null(); | |
341 if (deoptee_nm != NULL && deoptee_nm->is_method_handle_return(deoptee.pc())) | |
342 unpack_sp = deoptee.unextended_sp(); | |
343 | |
0 | 344 #ifdef ASSERT |
345 assert(cb->is_deoptimization_stub() || cb->is_uncommon_trap_stub(), "just checking"); | |
346 #endif | |
1692 | 347 #else |
348 intptr_t* unpack_sp = stub_frame.sender(&dummy_map).unextended_sp(); | |
349 #endif // !SHARK | |
350 | |
0 | 351 // This is a guarantee instead of an assert because if vframe doesn't match |
352 // we will unpack the wrong deoptimized frame and wind up in strange places | |
353 // where it will be very difficult to figure out what went wrong. Better | |
354 // to die an early death here than some very obscure death later when the | |
355 // trail is cold. | |
356 // Note: on ia64 this guarantee can be fooled by frames with no memory stack | |
357 // in that it will fail to detect a problem when there is one. This needs | |
358 // more work in tiger timeframe. | |
359 guarantee(array->unextended_sp() == unpack_sp, "vframe_array_head must contain the vframeArray to unpack"); | |
360 | |
361 int number_of_frames = array->frames(); | |
362 | |
363 // Compute the vframes' sizes. Note that frame_sizes[] entries are ordered from outermost to innermost | |
364 // virtual activation, which is the reverse of the elements in the vframes array. | |
6197 | 365 intptr_t* frame_sizes = NEW_C_HEAP_ARRAY(intptr_t, number_of_frames, mtCompiler); |
0 | 366 // +1 because we always have an interpreter return address for the final slot. |
6197 | 367 address* frame_pcs = NEW_C_HEAP_ARRAY(address, number_of_frames + 1, mtCompiler); |
0 | 368 int popframe_extra_args = 0; |
369 // Create an interpreter return address for the stub to use as its return | |
370 // address so the skeletal frames are perfectly walkable | |
371 frame_pcs[number_of_frames] = Interpreter::deopt_entry(vtos, 0); | |
372 | |
373 // PopFrame requires that the preserved incoming arguments from the recently-popped topmost | |
374 // activation be put back on the expression stack of the caller for reexecution | |
375 if (JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) { | |
376 popframe_extra_args = in_words(thread->popframe_preserved_args_size_in_words()); | |
377 } | |
378 | |
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379 // Find the current pc for sender of the deoptee. Since the sender may have been deoptimized |
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380 // itself since the deoptee vframeArray was created we must get a fresh value of the pc rather |
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381 // than simply use array->sender.pc(). This requires us to walk the current set of frames |
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382 // |
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383 frame deopt_sender = stub_frame.sender(&dummy_map); // First is the deoptee frame |
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384 deopt_sender = deopt_sender.sender(&dummy_map); // Now deoptee caller |
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385 |
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386 // It's possible that the number of paramters at the call site is |
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387 // different than number of arguments in the callee when method |
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388 // handles are used. If the caller is interpreted get the real |
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389 // value so that the proper amount of space can be added to it's |
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390 // frame. |
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391 bool caller_was_method_handle = false; |
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392 if (deopt_sender.is_interpreted_frame()) { |
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393 methodHandle method = deopt_sender.interpreter_frame_method(); |
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394 Bytecode_invoke cur = Bytecode_invoke_check(method, deopt_sender.interpreter_frame_bci()); |
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395 if (cur.is_invokedynamic() || cur.is_invokehandle()) { |
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396 // Method handle invokes may involve fairly arbitrary chains of |
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397 // calls so it's impossible to know how much actual space the |
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398 // caller has for locals. |
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399 caller_was_method_handle = true; |
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400 } |
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401 } |
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402 |
0 | 403 // |
404 // frame_sizes/frame_pcs[0] oldest frame (int or c2i) | |
405 // frame_sizes/frame_pcs[1] next oldest frame (int) | |
406 // frame_sizes/frame_pcs[n] youngest frame (int) | |
407 // | |
408 // Now a pc in frame_pcs is actually the return address to the frame's caller (a frame | |
409 // owns the space for the return address to it's caller). Confusing ain't it. | |
410 // | |
411 // The vframe array can address vframes with indices running from | |
412 // 0.._frames-1. Index 0 is the youngest frame and _frame - 1 is the oldest (root) frame. | |
413 // When we create the skeletal frames we need the oldest frame to be in the zero slot | |
414 // in the frame_sizes/frame_pcs so the assembly code can do a trivial walk. | |
415 // so things look a little strange in this loop. | |
416 // | |
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417 int callee_parameters = 0; |
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418 int callee_locals = 0; |
0 | 419 for (int index = 0; index < array->frames(); index++ ) { |
420 // frame[number_of_frames - 1 ] = on_stack_size(youngest) | |
421 // frame[number_of_frames - 2 ] = on_stack_size(sender(youngest)) | |
422 // frame[number_of_frames - 3 ] = on_stack_size(sender(sender(youngest))) | |
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423 int caller_parms = callee_parameters; |
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424 if ((index == array->frames() - 1) && caller_was_method_handle) { |
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425 caller_parms = 0; |
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426 } |
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427 frame_sizes[number_of_frames - 1 - index] = BytesPerWord * array->element(index)->on_stack_size(caller_parms, |
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428 callee_parameters, |
0 | 429 callee_locals, |
430 index == 0, | |
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431 index == array->frames() - 1, |
0 | 432 popframe_extra_args); |
433 // This pc doesn't have to be perfect just good enough to identify the frame | |
434 // as interpreted so the skeleton frame will be walkable | |
435 // The correct pc will be set when the skeleton frame is completely filled out | |
436 // The final pc we store in the loop is wrong and will be overwritten below | |
437 frame_pcs[number_of_frames - 1 - index ] = Interpreter::deopt_entry(vtos, 0) - frame::pc_return_offset; | |
438 | |
439 callee_parameters = array->element(index)->method()->size_of_parameters(); | |
440 callee_locals = array->element(index)->method()->max_locals(); | |
441 popframe_extra_args = 0; | |
442 } | |
443 | |
444 // Compute whether the root vframe returns a float or double value. | |
445 BasicType return_type; | |
446 { | |
447 HandleMark hm; | |
448 methodHandle method(thread, array->element(0)->method()); | |
2142 | 449 Bytecode_invoke invoke = Bytecode_invoke_check(method, array->element(0)->bci()); |
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450 return_type = invoke.is_valid() ? invoke.result_type() : T_ILLEGAL; |
0 | 451 } |
452 | |
453 // Compute information for handling adapters and adjusting the frame size of the caller. | |
454 int caller_adjustment = 0; | |
455 | |
456 // Compute the amount the oldest interpreter frame will have to adjust | |
457 // its caller's stack by. If the caller is a compiled frame then | |
458 // we pretend that the callee has no parameters so that the | |
459 // extension counts for the full amount of locals and not just | |
460 // locals-parms. This is because without a c2i adapter the parm | |
461 // area as created by the compiled frame will not be usable by | |
462 // the interpreter. (Depending on the calling convention there | |
463 // may not even be enough space). | |
464 | |
465 // QQQ I'd rather see this pushed down into last_frame_adjust | |
466 // and have it take the sender (aka caller). | |
467 | |
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468 if (deopt_sender.is_compiled_frame() || caller_was_method_handle) { |
0 | 469 caller_adjustment = last_frame_adjust(0, callee_locals); |
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470 } else if (callee_locals > callee_parameters) { |
0 | 471 // The caller frame may need extending to accommodate |
472 // non-parameter locals of the first unpacked interpreted frame. | |
473 // Compute that adjustment. | |
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474 caller_adjustment = last_frame_adjust(callee_parameters, callee_locals); |
0 | 475 } |
476 | |
477 // If the sender is deoptimized the we must retrieve the address of the handler | |
478 // since the frame will "magically" show the original pc before the deopt | |
479 // and we'd undo the deopt. | |
480 | |
481 frame_pcs[0] = deopt_sender.raw_pc(); | |
482 | |
1692 | 483 #ifndef SHARK |
0 | 484 assert(CodeCache::find_blob_unsafe(frame_pcs[0]) != NULL, "bad pc"); |
1692 | 485 #endif // SHARK |
0 | 486 |
487 UnrollBlock* info = new UnrollBlock(array->frame_size() * BytesPerWord, | |
488 caller_adjustment * BytesPerWord, | |
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489 caller_was_method_handle ? 0 : callee_parameters, |
0 | 490 number_of_frames, |
491 frame_sizes, | |
492 frame_pcs, | |
493 return_type); | |
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494 // On some platforms, we need a way to pass some platform dependent |
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495 // information to the unpacking code so the skeletal frames come out |
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496 // correct (initial fp value, unextended sp, ...) |
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497 info->set_initial_info((intptr_t) array->sender().initial_deoptimization_info()); |
0 | 498 |
499 if (array->frames() > 1) { | |
500 if (VerifyStack && TraceDeoptimization) { | |
6843 | 501 ttyLocker ttyl; |
0 | 502 tty->print_cr("Deoptimizing method containing inlining"); |
503 } | |
504 } | |
505 | |
506 array->set_unroll_block(info); | |
507 return info; | |
508 } | |
509 | |
510 // Called to cleanup deoptimization data structures in normal case | |
511 // after unpacking to stack and when stack overflow error occurs | |
512 void Deoptimization::cleanup_deopt_info(JavaThread *thread, | |
513 vframeArray *array) { | |
514 | |
515 // Get array if coming from exception | |
516 if (array == NULL) { | |
517 array = thread->vframe_array_head(); | |
518 } | |
519 thread->set_vframe_array_head(NULL); | |
520 | |
521 // Free the previous UnrollBlock | |
522 vframeArray* old_array = thread->vframe_array_last(); | |
523 thread->set_vframe_array_last(array); | |
524 | |
525 if (old_array != NULL) { | |
526 UnrollBlock* old_info = old_array->unroll_block(); | |
527 old_array->set_unroll_block(NULL); | |
528 delete old_info; | |
529 delete old_array; | |
530 } | |
531 | |
532 // Deallocate any resource creating in this routine and any ResourceObjs allocated | |
533 // inside the vframeArray (StackValueCollections) | |
534 | |
535 delete thread->deopt_mark(); | |
536 thread->set_deopt_mark(NULL); | |
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537 thread->set_deopt_nmethod(NULL); |
0 | 538 |
539 | |
540 if (JvmtiExport::can_pop_frame()) { | |
541 #ifndef CC_INTERP | |
542 // Regardless of whether we entered this routine with the pending | |
543 // popframe condition bit set, we should always clear it now | |
544 thread->clear_popframe_condition(); | |
545 #else | |
546 // C++ interpeter will clear has_pending_popframe when it enters | |
547 // with method_resume. For deopt_resume2 we clear it now. | |
548 if (thread->popframe_forcing_deopt_reexecution()) | |
549 thread->clear_popframe_condition(); | |
550 #endif /* CC_INTERP */ | |
551 } | |
552 | |
553 // unpack_frames() is called at the end of the deoptimization handler | |
554 // and (in C2) at the end of the uncommon trap handler. Note this fact | |
555 // so that an asynchronous stack walker can work again. This counter is | |
556 // incremented at the beginning of fetch_unroll_info() and (in C2) at | |
557 // the beginning of uncommon_trap(). | |
558 thread->dec_in_deopt_handler(); | |
559 } | |
560 | |
561 | |
562 // Return BasicType of value being returned | |
563 JRT_LEAF(BasicType, Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)) | |
564 | |
565 // We are already active int he special DeoptResourceMark any ResourceObj's we | |
566 // allocate will be freed at the end of the routine. | |
567 | |
568 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
569 // but makes the entry a little slower. There is however a little dance we have to | |
570 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
571 ResetNoHandleMark rnhm; // No-op in release/product versions | |
572 HandleMark hm; | |
573 | |
574 frame stub_frame = thread->last_frame(); | |
575 | |
576 // Since the frame to unpack is the top frame of this thread, the vframe_array_head | |
577 // must point to the vframeArray for the unpack frame. | |
578 vframeArray* array = thread->vframe_array_head(); | |
579 | |
580 #ifndef PRODUCT | |
581 if (TraceDeoptimization) { | |
6843 | 582 ttyLocker ttyl; |
0 | 583 tty->print_cr("DEOPT UNPACKING thread " INTPTR_FORMAT " vframeArray " INTPTR_FORMAT " mode %d", thread, array, exec_mode); |
584 } | |
585 #endif | |
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586 Events::log(thread, "DEOPT UNPACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT " mode %d", |
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587 stub_frame.pc(), stub_frame.sp(), exec_mode); |
0 | 588 |
589 UnrollBlock* info = array->unroll_block(); | |
590 | |
591 // Unpack the interpreter frames and any adapter frame (c2 only) we might create. | |
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592 array->unpack_to_stack(stub_frame, exec_mode, info->caller_actual_parameters()); |
0 | 593 |
594 BasicType bt = info->return_type(); | |
595 | |
596 // If we have an exception pending, claim that the return type is an oop | |
597 // so the deopt_blob does not overwrite the exception_oop. | |
598 | |
599 if (exec_mode == Unpack_exception) | |
600 bt = T_OBJECT; | |
601 | |
602 // Cleanup thread deopt data | |
603 cleanup_deopt_info(thread, array); | |
604 | |
605 #ifndef PRODUCT | |
606 if (VerifyStack) { | |
607 ResourceMark res_mark; | |
608 | |
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609 thread->validate_frame_layout(); |
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610 |
0 | 611 // Verify that the just-unpacked frames match the interpreter's |
612 // notions of expression stack and locals | |
613 vframeArray* cur_array = thread->vframe_array_last(); | |
614 RegisterMap rm(thread, false); | |
615 rm.set_include_argument_oops(false); | |
616 bool is_top_frame = true; | |
617 int callee_size_of_parameters = 0; | |
618 int callee_max_locals = 0; | |
619 for (int i = 0; i < cur_array->frames(); i++) { | |
620 vframeArrayElement* el = cur_array->element(i); | |
621 frame* iframe = el->iframe(); | |
622 guarantee(iframe->is_interpreted_frame(), "Wrong frame type"); | |
623 | |
624 // Get the oop map for this bci | |
625 InterpreterOopMap mask; | |
626 int cur_invoke_parameter_size = 0; | |
627 bool try_next_mask = false; | |
628 int next_mask_expression_stack_size = -1; | |
629 int top_frame_expression_stack_adjustment = 0; | |
630 methodHandle mh(thread, iframe->interpreter_frame_method()); | |
631 OopMapCache::compute_one_oop_map(mh, iframe->interpreter_frame_bci(), &mask); | |
632 BytecodeStream str(mh); | |
633 str.set_start(iframe->interpreter_frame_bci()); | |
634 int max_bci = mh->code_size(); | |
635 // Get to the next bytecode if possible | |
636 assert(str.bci() < max_bci, "bci in interpreter frame out of bounds"); | |
637 // Check to see if we can grab the number of outgoing arguments | |
638 // at an uncommon trap for an invoke (where the compiler | |
639 // generates debug info before the invoke has executed) | |
640 Bytecodes::Code cur_code = str.next(); | |
641 if (cur_code == Bytecodes::_invokevirtual || | |
642 cur_code == Bytecodes::_invokespecial || | |
643 cur_code == Bytecodes::_invokestatic || | |
644 cur_code == Bytecodes::_invokeinterface) { | |
2142 | 645 Bytecode_invoke invoke(mh, iframe->interpreter_frame_bci()); |
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646 Symbol* signature = invoke.signature(); |
0 | 647 ArgumentSizeComputer asc(signature); |
648 cur_invoke_parameter_size = asc.size(); | |
649 if (cur_code != Bytecodes::_invokestatic) { | |
650 // Add in receiver | |
651 ++cur_invoke_parameter_size; | |
652 } | |
653 } | |
654 if (str.bci() < max_bci) { | |
655 Bytecodes::Code bc = str.next(); | |
656 if (bc >= 0) { | |
657 // The interpreter oop map generator reports results before | |
658 // the current bytecode has executed except in the case of | |
659 // calls. It seems to be hard to tell whether the compiler | |
660 // has emitted debug information matching the "state before" | |
661 // a given bytecode or the state after, so we try both | |
662 switch (cur_code) { | |
663 case Bytecodes::_invokevirtual: | |
664 case Bytecodes::_invokespecial: | |
665 case Bytecodes::_invokestatic: | |
666 case Bytecodes::_invokeinterface: | |
667 case Bytecodes::_athrow: | |
668 break; | |
669 default: { | |
670 InterpreterOopMap next_mask; | |
671 OopMapCache::compute_one_oop_map(mh, str.bci(), &next_mask); | |
672 next_mask_expression_stack_size = next_mask.expression_stack_size(); | |
673 // Need to subtract off the size of the result type of | |
674 // the bytecode because this is not described in the | |
675 // debug info but returned to the interpreter in the TOS | |
676 // caching register | |
677 BasicType bytecode_result_type = Bytecodes::result_type(cur_code); | |
678 if (bytecode_result_type != T_ILLEGAL) { | |
679 top_frame_expression_stack_adjustment = type2size[bytecode_result_type]; | |
680 } | |
681 assert(top_frame_expression_stack_adjustment >= 0, ""); | |
682 try_next_mask = true; | |
683 break; | |
684 } | |
685 } | |
686 } | |
687 } | |
688 | |
689 // Verify stack depth and oops in frame | |
690 // This assertion may be dependent on the platform we're running on and may need modification (tested on x86 and sparc) | |
691 if (!( | |
692 /* SPARC */ | |
693 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_size_of_parameters) || | |
694 /* x86 */ | |
695 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_max_locals) || | |
696 (try_next_mask && | |
697 (iframe->interpreter_frame_expression_stack_size() == (next_mask_expression_stack_size - | |
698 top_frame_expression_stack_adjustment))) || | |
699 (is_top_frame && (exec_mode == Unpack_exception) && iframe->interpreter_frame_expression_stack_size() == 0) || | |
700 (is_top_frame && (exec_mode == Unpack_uncommon_trap || exec_mode == Unpack_reexecute) && | |
701 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + cur_invoke_parameter_size)) | |
702 )) { | |
703 ttyLocker ttyl; | |
704 | |
705 // Print out some information that will help us debug the problem | |
706 tty->print_cr("Wrong number of expression stack elements during deoptimization"); | |
707 tty->print_cr(" Error occurred while verifying frame %d (0..%d, 0 is topmost)", i, cur_array->frames() - 1); | |
708 tty->print_cr(" Fabricated interpreter frame had %d expression stack elements", | |
709 iframe->interpreter_frame_expression_stack_size()); | |
710 tty->print_cr(" Interpreter oop map had %d expression stack elements", mask.expression_stack_size()); | |
711 tty->print_cr(" try_next_mask = %d", try_next_mask); | |
712 tty->print_cr(" next_mask_expression_stack_size = %d", next_mask_expression_stack_size); | |
713 tty->print_cr(" callee_size_of_parameters = %d", callee_size_of_parameters); | |
714 tty->print_cr(" callee_max_locals = %d", callee_max_locals); | |
715 tty->print_cr(" top_frame_expression_stack_adjustment = %d", top_frame_expression_stack_adjustment); | |
716 tty->print_cr(" exec_mode = %d", exec_mode); | |
717 tty->print_cr(" cur_invoke_parameter_size = %d", cur_invoke_parameter_size); | |
718 tty->print_cr(" Thread = " INTPTR_FORMAT ", thread ID = " UINTX_FORMAT, thread, thread->osthread()->thread_id()); | |
719 tty->print_cr(" Interpreted frames:"); | |
720 for (int k = 0; k < cur_array->frames(); k++) { | |
721 vframeArrayElement* el = cur_array->element(k); | |
722 tty->print_cr(" %s (bci %d)", el->method()->name_and_sig_as_C_string(), el->bci()); | |
723 } | |
724 cur_array->print_on_2(tty); | |
725 guarantee(false, "wrong number of expression stack elements during deopt"); | |
726 } | |
727 VerifyOopClosure verify; | |
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728 iframe->oops_interpreted_do(&verify, NULL, &rm, false); |
0 | 729 callee_size_of_parameters = mh->size_of_parameters(); |
730 callee_max_locals = mh->max_locals(); | |
731 is_top_frame = false; | |
732 } | |
733 } | |
734 #endif /* !PRODUCT */ | |
735 | |
736 | |
737 return bt; | |
738 JRT_END | |
739 | |
740 | |
741 int Deoptimization::deoptimize_dependents() { | |
742 Threads::deoptimized_wrt_marked_nmethods(); | |
743 return 0; | |
744 } | |
745 | |
746 | |
747 #ifdef COMPILER2 | |
748 bool Deoptimization::realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS) { | |
749 Handle pending_exception(thread->pending_exception()); | |
750 const char* exception_file = thread->exception_file(); | |
751 int exception_line = thread->exception_line(); | |
752 thread->clear_pending_exception(); | |
753 | |
754 for (int i = 0; i < objects->length(); i++) { | |
755 assert(objects->at(i)->is_object(), "invalid debug information"); | |
756 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
757 | |
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758 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 759 oop obj = NULL; |
760 | |
761 if (k->oop_is_instance()) { | |
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762 InstanceKlass* ik = InstanceKlass::cast(k()); |
0 | 763 obj = ik->allocate_instance(CHECK_(false)); |
764 } else if (k->oop_is_typeArray()) { | |
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765 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
0 | 766 assert(sv->field_size() % type2size[ak->element_type()] == 0, "non-integral array length"); |
767 int len = sv->field_size() / type2size[ak->element_type()]; | |
768 obj = ak->allocate(len, CHECK_(false)); | |
769 } else if (k->oop_is_objArray()) { | |
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770 ObjArrayKlass* ak = ObjArrayKlass::cast(k()); |
0 | 771 obj = ak->allocate(sv->field_size(), CHECK_(false)); |
772 } | |
773 | |
774 assert(obj != NULL, "allocation failed"); | |
775 assert(sv->value().is_null(), "redundant reallocation"); | |
776 sv->set_value(obj); | |
777 } | |
778 | |
779 if (pending_exception.not_null()) { | |
780 thread->set_pending_exception(pending_exception(), exception_file, exception_line); | |
781 } | |
782 | |
783 return true; | |
784 } | |
785 | |
786 // This assumes that the fields are stored in ObjectValue in the same order | |
787 // they are yielded by do_nonstatic_fields. | |
788 class FieldReassigner: public FieldClosure { | |
789 frame* _fr; | |
790 RegisterMap* _reg_map; | |
791 ObjectValue* _sv; | |
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792 InstanceKlass* _ik; |
0 | 793 oop _obj; |
794 | |
795 int _i; | |
796 public: | |
797 FieldReassigner(frame* fr, RegisterMap* reg_map, ObjectValue* sv, oop obj) : | |
798 _fr(fr), _reg_map(reg_map), _sv(sv), _obj(obj), _i(0) {} | |
799 | |
800 int i() const { return _i; } | |
801 | |
802 | |
803 void do_field(fieldDescriptor* fd) { | |
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804 intptr_t val; |
0 | 805 StackValue* value = |
806 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(i())); | |
807 int offset = fd->offset(); | |
808 switch (fd->field_type()) { | |
809 case T_OBJECT: case T_ARRAY: | |
810 assert(value->type() == T_OBJECT, "Agreement."); | |
811 _obj->obj_field_put(offset, value->get_obj()()); | |
812 break; | |
813 | |
814 case T_LONG: case T_DOUBLE: { | |
815 assert(value->type() == T_INT, "Agreement."); | |
816 StackValue* low = | |
817 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(++_i)); | |
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818 #ifdef _LP64 |
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819 jlong res = (jlong)low->get_int(); |
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820 #else |
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821 #ifdef SPARC |
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822 // For SPARC we have to swap high and low words. |
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823 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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824 #else |
0 | 825 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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826 #endif //SPARC |
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827 #endif |
0 | 828 _obj->long_field_put(offset, res); |
829 break; | |
830 } | |
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831 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
0 | 832 case T_INT: case T_FLOAT: // 4 bytes. |
833 assert(value->type() == T_INT, "Agreement."); | |
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834 val = value->get_int(); |
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835 _obj->int_field_put(offset, (jint)*((jint*)&val)); |
0 | 836 break; |
837 | |
838 case T_SHORT: case T_CHAR: // 2 bytes | |
839 assert(value->type() == T_INT, "Agreement."); | |
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840 val = value->get_int(); |
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841 _obj->short_field_put(offset, (jshort)*((jint*)&val)); |
0 | 842 break; |
843 | |
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844 case T_BOOLEAN: case T_BYTE: // 1 byte |
0 | 845 assert(value->type() == T_INT, "Agreement."); |
44
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846 val = value->get_int(); |
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847 _obj->bool_field_put(offset, (jboolean)*((jint*)&val)); |
0 | 848 break; |
849 | |
850 default: | |
851 ShouldNotReachHere(); | |
852 } | |
853 _i++; | |
854 } | |
855 }; | |
856 | |
857 // restore elements of an eliminated type array | |
858 void Deoptimization::reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type) { | |
859 int index = 0; | |
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860 intptr_t val; |
0 | 861 |
862 for (int i = 0; i < sv->field_size(); i++) { | |
863 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
864 switch(type) { | |
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865 case T_LONG: case T_DOUBLE: { |
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866 assert(value->type() == T_INT, "Agreement."); |
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867 StackValue* low = |
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868 StackValue::create_stack_value(fr, reg_map, sv->field_at(++i)); |
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869 #ifdef _LP64 |
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870 jlong res = (jlong)low->get_int(); |
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871 #else |
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872 #ifdef SPARC |
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873 // For SPARC we have to swap high and low words. |
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874 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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875 #else |
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876 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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877 #endif //SPARC |
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878 #endif |
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879 obj->long_at_put(index, res); |
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880 break; |
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881 } |
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882 |
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883 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
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884 case T_INT: case T_FLOAT: // 4 bytes. |
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885 assert(value->type() == T_INT, "Agreement."); |
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886 val = value->get_int(); |
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887 obj->int_at_put(index, (jint)*((jint*)&val)); |
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888 break; |
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889 |
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890 case T_SHORT: case T_CHAR: // 2 bytes |
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891 assert(value->type() == T_INT, "Agreement."); |
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892 val = value->get_int(); |
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893 obj->short_at_put(index, (jshort)*((jint*)&val)); |
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894 break; |
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895 |
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896 case T_BOOLEAN: case T_BYTE: // 1 byte |
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897 assert(value->type() == T_INT, "Agreement."); |
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898 val = value->get_int(); |
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899 obj->bool_at_put(index, (jboolean)*((jint*)&val)); |
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900 break; |
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901 |
0 | 902 default: |
903 ShouldNotReachHere(); | |
904 } | |
905 index++; | |
906 } | |
907 } | |
908 | |
909 | |
910 // restore fields of an eliminated object array | |
911 void Deoptimization::reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj) { | |
912 for (int i = 0; i < sv->field_size(); i++) { | |
913 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
914 assert(value->type() == T_OBJECT, "object element expected"); | |
915 obj->obj_at_put(i, value->get_obj()()); | |
916 } | |
917 } | |
918 | |
919 | |
920 // restore fields of all eliminated objects and arrays | |
921 void Deoptimization::reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects) { | |
922 for (int i = 0; i < objects->length(); i++) { | |
923 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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924 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 925 Handle obj = sv->value(); |
926 assert(obj.not_null(), "reallocation was missed"); | |
927 | |
928 if (k->oop_is_instance()) { | |
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929 InstanceKlass* ik = InstanceKlass::cast(k()); |
0 | 930 FieldReassigner reassign(fr, reg_map, sv, obj()); |
931 ik->do_nonstatic_fields(&reassign); | |
932 } else if (k->oop_is_typeArray()) { | |
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933 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
0 | 934 reassign_type_array_elements(fr, reg_map, sv, (typeArrayOop) obj(), ak->element_type()); |
935 } else if (k->oop_is_objArray()) { | |
936 reassign_object_array_elements(fr, reg_map, sv, (objArrayOop) obj()); | |
937 } | |
938 } | |
939 } | |
940 | |
941 | |
942 // relock objects for which synchronization was eliminated | |
83
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943 void Deoptimization::relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread) { |
0 | 944 for (int i = 0; i < monitors->length(); i++) { |
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945 MonitorInfo* mon_info = monitors->at(i); |
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946 if (mon_info->eliminated()) { |
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947 assert(mon_info->owner() != NULL, "reallocation was missed"); |
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948 Handle obj = Handle(mon_info->owner()); |
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949 markOop mark = obj->mark(); |
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950 if (UseBiasedLocking && mark->has_bias_pattern()) { |
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951 // New allocated objects may have the mark set to anonymously biased. |
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952 // Also the deoptimized method may called methods with synchronization |
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953 // where the thread-local object is bias locked to the current thread. |
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954 assert(mark->is_biased_anonymously() || |
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955 mark->biased_locker() == thread, "should be locked to current thread"); |
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956 // Reset mark word to unbiased prototype. |
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957 markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
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958 obj->set_mark(unbiased_prototype); |
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959 } |
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960 BasicLock* lock = mon_info->lock(); |
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961 ObjectSynchronizer::slow_enter(obj, lock, thread); |
0 | 962 } |
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963 assert(mon_info->owner()->is_locked(), "object must be locked now"); |
0 | 964 } |
965 } | |
966 | |
967 | |
968 #ifndef PRODUCT | |
969 // print information about reallocated objects | |
970 void Deoptimization::print_objects(GrowableArray<ScopeValue*>* objects) { | |
971 fieldDescriptor fd; | |
972 | |
973 for (int i = 0; i < objects->length(); i++) { | |
974 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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975 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 976 Handle obj = sv->value(); |
977 | |
978 tty->print(" object <" INTPTR_FORMAT "> of type ", sv->value()()); | |
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979 k->print_value(); |
0 | 980 tty->print(" allocated (%d bytes)", obj->size() * HeapWordSize); |
981 tty->cr(); | |
982 | |
983 if (Verbose) { | |
984 k->oop_print_on(obj(), tty); | |
985 } | |
986 } | |
987 } | |
988 #endif | |
989 #endif // COMPILER2 | |
990 | |
991 vframeArray* Deoptimization::create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk) { | |
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992 Events::log(thread, "DEOPT PACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT, fr.pc(), fr.sp()); |
0 | 993 |
994 #ifndef PRODUCT | |
995 if (TraceDeoptimization) { | |
996 ttyLocker ttyl; | |
997 tty->print("DEOPT PACKING thread " INTPTR_FORMAT " ", thread); | |
998 fr.print_on(tty); | |
999 tty->print_cr(" Virtual frames (innermost first):"); | |
1000 for (int index = 0; index < chunk->length(); index++) { | |
1001 compiledVFrame* vf = chunk->at(index); | |
1002 tty->print(" %2d - ", index); | |
1003 vf->print_value(); | |
1004 int bci = chunk->at(index)->raw_bci(); | |
1005 const char* code_name; | |
1006 if (bci == SynchronizationEntryBCI) { | |
1007 code_name = "sync entry"; | |
1008 } else { | |
2142 | 1009 Bytecodes::Code code = vf->method()->code_at(bci); |
0 | 1010 code_name = Bytecodes::name(code); |
1011 } | |
1012 tty->print(" - %s", code_name); | |
1013 tty->print_cr(" @ bci %d ", bci); | |
1014 if (Verbose) { | |
1015 vf->print(); | |
1016 tty->cr(); | |
1017 } | |
1018 } | |
1019 } | |
1020 #endif | |
1021 | |
1022 // Register map for next frame (used for stack crawl). We capture | |
1023 // the state of the deopt'ing frame's caller. Thus if we need to | |
1024 // stuff a C2I adapter we can properly fill in the callee-save | |
1025 // register locations. | |
1026 frame caller = fr.sender(reg_map); | |
1027 int frame_size = caller.sp() - fr.sp(); | |
1028 | |
1029 frame sender = caller; | |
1030 | |
1031 // Since the Java thread being deoptimized will eventually adjust it's own stack, | |
1032 // the vframeArray containing the unpacking information is allocated in the C heap. | |
1033 // For Compiler1, the caller of the deoptimized frame is saved for use by unpack_frames(). | |
1034 vframeArray* array = vframeArray::allocate(thread, frame_size, chunk, reg_map, sender, caller, fr); | |
1035 | |
1036 // Compare the vframeArray to the collected vframes | |
1037 assert(array->structural_compare(thread, chunk), "just checking"); | |
1038 | |
1039 #ifndef PRODUCT | |
1040 if (TraceDeoptimization) { | |
1041 ttyLocker ttyl; | |
1042 tty->print_cr(" Created vframeArray " INTPTR_FORMAT, array); | |
1043 } | |
1044 #endif // PRODUCT | |
1045 | |
1046 return array; | |
1047 } | |
1048 | |
1049 | |
1050 static void collect_monitors(compiledVFrame* cvf, GrowableArray<Handle>* objects_to_revoke) { | |
1051 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); | |
1052 for (int i = 0; i < monitors->length(); i++) { | |
1053 MonitorInfo* mon_info = monitors->at(i); | |
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1054 if (!mon_info->eliminated() && mon_info->owner() != NULL) { |
0 | 1055 objects_to_revoke->append(Handle(mon_info->owner())); |
1056 } | |
1057 } | |
1058 } | |
1059 | |
1060 | |
1061 void Deoptimization::revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map) { | |
1062 if (!UseBiasedLocking) { | |
1063 return; | |
1064 } | |
1065 | |
1066 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
1067 | |
1068 // Unfortunately we don't have a RegisterMap available in most of | |
1069 // the places we want to call this routine so we need to walk the | |
1070 // stack again to update the register map. | |
1071 if (map == NULL || !map->update_map()) { | |
1072 StackFrameStream sfs(thread, true); | |
1073 bool found = false; | |
1074 while (!found && !sfs.is_done()) { | |
1075 frame* cur = sfs.current(); | |
1076 sfs.next(); | |
1077 found = cur->id() == fr.id(); | |
1078 } | |
1079 assert(found, "frame to be deoptimized not found on target thread's stack"); | |
1080 map = sfs.register_map(); | |
1081 } | |
1082 | |
1083 vframe* vf = vframe::new_vframe(&fr, map, thread); | |
1084 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1085 // Revoke monitors' biases in all scopes | |
1086 while (!cvf->is_top()) { | |
1087 collect_monitors(cvf, objects_to_revoke); | |
1088 cvf = compiledVFrame::cast(cvf->sender()); | |
1089 } | |
1090 collect_monitors(cvf, objects_to_revoke); | |
1091 | |
1092 if (SafepointSynchronize::is_at_safepoint()) { | |
1093 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
1094 } else { | |
1095 BiasedLocking::revoke(objects_to_revoke); | |
1096 } | |
1097 } | |
1098 | |
1099 | |
1100 void Deoptimization::revoke_biases_of_monitors(CodeBlob* cb) { | |
1101 if (!UseBiasedLocking) { | |
1102 return; | |
1103 } | |
1104 | |
1105 assert(SafepointSynchronize::is_at_safepoint(), "must only be called from safepoint"); | |
1106 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
1107 for (JavaThread* jt = Threads::first(); jt != NULL ; jt = jt->next()) { | |
1108 if (jt->has_last_Java_frame()) { | |
1109 StackFrameStream sfs(jt, true); | |
1110 while (!sfs.is_done()) { | |
1111 frame* cur = sfs.current(); | |
1112 if (cb->contains(cur->pc())) { | |
1113 vframe* vf = vframe::new_vframe(cur, sfs.register_map(), jt); | |
1114 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1115 // Revoke monitors' biases in all scopes | |
1116 while (!cvf->is_top()) { | |
1117 collect_monitors(cvf, objects_to_revoke); | |
1118 cvf = compiledVFrame::cast(cvf->sender()); | |
1119 } | |
1120 collect_monitors(cvf, objects_to_revoke); | |
1121 } | |
1122 sfs.next(); | |
1123 } | |
1124 } | |
1125 } | |
1126 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
1127 } | |
1128 | |
1129 | |
1130 void Deoptimization::deoptimize_single_frame(JavaThread* thread, frame fr) { | |
1131 assert(fr.can_be_deoptimized(), "checking frame type"); | |
1132 | |
1133 gather_statistics(Reason_constraint, Action_none, Bytecodes::_illegal); | |
1134 | |
1135 // Patch the nmethod so that when execution returns to it we will | |
1136 // deopt the execution state and return to the interpreter. | |
1137 fr.deoptimize(thread); | |
1138 } | |
1139 | |
1140 void Deoptimization::deoptimize(JavaThread* thread, frame fr, RegisterMap *map) { | |
1141 // Deoptimize only if the frame comes from compile code. | |
1142 // Do not deoptimize the frame which is already patched | |
1143 // during the execution of the loops below. | |
1144 if (!fr.is_compiled_frame() || fr.is_deoptimized_frame()) { | |
1145 return; | |
1146 } | |
1147 ResourceMark rm; | |
1148 DeoptimizationMarker dm; | |
1149 if (UseBiasedLocking) { | |
1150 revoke_biases_of_monitors(thread, fr, map); | |
1151 } | |
1152 deoptimize_single_frame(thread, fr); | |
1153 | |
1154 } | |
1155 | |
1156 | |
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1157 void Deoptimization::deoptimize_frame_internal(JavaThread* thread, intptr_t* id) { |
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1158 assert(thread == Thread::current() || SafepointSynchronize::is_at_safepoint(), |
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1159 "can only deoptimize other thread at a safepoint"); |
0 | 1160 // Compute frame and register map based on thread and sp. |
1161 RegisterMap reg_map(thread, UseBiasedLocking); | |
1162 frame fr = thread->last_frame(); | |
1163 while (fr.id() != id) { | |
1164 fr = fr.sender(®_map); | |
1165 } | |
1166 deoptimize(thread, fr, ®_map); | |
1167 } | |
1168 | |
1169 | |
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1170 void Deoptimization::deoptimize_frame(JavaThread* thread, intptr_t* id) { |
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1171 if (thread == Thread::current()) { |
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1172 Deoptimization::deoptimize_frame_internal(thread, id); |
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1173 } else { |
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1174 VM_DeoptimizeFrame deopt(thread, id); |
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1175 VMThread::execute(&deopt); |
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1176 } |
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1177 } |
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1178 |
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1179 |
0 | 1180 // JVMTI PopFrame support |
1181 JRT_LEAF(void, Deoptimization::popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address)) | |
1182 { | |
1183 thread->popframe_preserve_args(in_ByteSize(bytes_to_save), start_address); | |
1184 } | |
1185 JRT_END | |
1186 | |
1187 | |
1692 | 1188 #if defined(COMPILER2) || defined(SHARK) |
0 | 1189 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS) { |
1190 // in case of an unresolved klass entry, load the class. | |
1191 if (constant_pool->tag_at(index).is_unresolved_klass()) { | |
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1192 Klass* tk = constant_pool->klass_at(index, CHECK); |
0 | 1193 return; |
1194 } | |
1195 | |
1196 if (!constant_pool->tag_at(index).is_symbol()) return; | |
1197 | |
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1198 Handle class_loader (THREAD, constant_pool->pool_holder()->class_loader()); |
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1199 Symbol* symbol = constant_pool->symbol_at(index); |
0 | 1200 |
1201 // class name? | |
1202 if (symbol->byte_at(0) != '(') { | |
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1203 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
0 | 1204 SystemDictionary::resolve_or_null(symbol, class_loader, protection_domain, CHECK); |
1205 return; | |
1206 } | |
1207 | |
1208 // then it must be a signature! | |
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1209 ResourceMark rm(THREAD); |
0 | 1210 for (SignatureStream ss(symbol); !ss.is_done(); ss.next()) { |
1211 if (ss.is_object()) { | |
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1212 Symbol* class_name = ss.as_symbol(CHECK); |
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1213 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
0 | 1214 SystemDictionary::resolve_or_null(class_name, class_loader, protection_domain, CHECK); |
1215 } | |
1216 } | |
1217 } | |
1218 | |
1219 | |
1220 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) { | |
1221 EXCEPTION_MARK; | |
1222 load_class_by_index(constant_pool, index, THREAD); | |
1223 if (HAS_PENDING_EXCEPTION) { | |
1224 // Exception happened during classloading. We ignore the exception here, since it | |
1225 // is going to be rethrown since the current activation is going to be deoptimzied and | |
1226 // the interpreter will re-execute the bytecode. | |
1227 CLEAR_PENDING_EXCEPTION; | |
1228 } | |
1229 } | |
1230 | |
1231 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) { | |
1232 HandleMark hm; | |
1233 | |
1234 // uncommon_trap() is called at the beginning of the uncommon trap | |
1235 // handler. Note this fact before we start generating temporary frames | |
1236 // that can confuse an asynchronous stack walker. This counter is | |
1237 // decremented at the end of unpack_frames(). | |
1238 thread->inc_in_deopt_handler(); | |
1239 | |
1240 // We need to update the map if we have biased locking. | |
1241 RegisterMap reg_map(thread, UseBiasedLocking); | |
1242 frame stub_frame = thread->last_frame(); | |
1243 frame fr = stub_frame.sender(®_map); | |
1244 // Make sure the calling nmethod is not getting deoptimized and removed | |
1245 // before we are done with it. | |
1246 nmethodLocker nl(fr.pc()); | |
1247 | |
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1248 // Log a message |
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1249 Events::log(thread, "Uncommon trap: trap_request=" PTR32_FORMAT " fr.pc=" INTPTR_FORMAT, |
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1250 trap_request, fr.pc()); |
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1251 |
0 | 1252 { |
1253 ResourceMark rm; | |
1254 | |
1255 // Revoke biases of any monitors in the frame to ensure we can migrate them | |
1256 revoke_biases_of_monitors(thread, fr, ®_map); | |
1257 | |
1258 DeoptReason reason = trap_request_reason(trap_request); | |
1259 DeoptAction action = trap_request_action(trap_request); | |
1260 jint unloaded_class_index = trap_request_index(trap_request); // CP idx or -1 | |
1261 | |
1262 vframe* vf = vframe::new_vframe(&fr, ®_map, thread); | |
1263 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1264 | |
1265 nmethod* nm = cvf->code(); | |
1266 | |
1267 ScopeDesc* trap_scope = cvf->scope(); | |
1268 methodHandle trap_method = trap_scope->method(); | |
1269 int trap_bci = trap_scope->bci(); | |
2142 | 1270 Bytecodes::Code trap_bc = trap_method->java_code_at(trap_bci); |
0 | 1271 |
1272 // Record this event in the histogram. | |
1273 gather_statistics(reason, action, trap_bc); | |
1274 | |
1275 // Ensure that we can record deopt. history: | |
1276 bool create_if_missing = ProfileTraps; | |
1277 | |
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1278 MethodData* trap_mdo = |
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1279 get_method_data(thread, trap_method, create_if_missing); |
0 | 1280 |
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1281 // Log a message |
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1282 Events::log_deopt_message(thread, "Uncommon trap: reason=%s action=%s pc=" INTPTR_FORMAT " method=%s @ %d", |
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1283 trap_reason_name(reason), trap_action_name(action), fr.pc(), |
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1284 trap_method->name_and_sig_as_C_string(), trap_bci); |
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1285 |
0 | 1286 // Print a bunch of diagnostics, if requested. |
1287 if (TraceDeoptimization || LogCompilation) { | |
1288 ResourceMark rm; | |
1289 ttyLocker ttyl; | |
1290 char buf[100]; | |
1291 if (xtty != NULL) { | |
1292 xtty->begin_head("uncommon_trap thread='" UINTX_FORMAT"' %s", | |
1293 os::current_thread_id(), | |
1294 format_trap_request(buf, sizeof(buf), trap_request)); | |
1295 nm->log_identity(xtty); | |
1296 } | |
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1297 Symbol* class_name = NULL; |
0 | 1298 bool unresolved = false; |
1299 if (unloaded_class_index >= 0) { | |
1300 constantPoolHandle constants (THREAD, trap_method->constants()); | |
1301 if (constants->tag_at(unloaded_class_index).is_unresolved_klass()) { | |
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1302 class_name = constants->klass_name_at(unloaded_class_index); |
0 | 1303 unresolved = true; |
1304 if (xtty != NULL) | |
1305 xtty->print(" unresolved='1'"); | |
1306 } else if (constants->tag_at(unloaded_class_index).is_symbol()) { | |
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1307 class_name = constants->symbol_at(unloaded_class_index); |
0 | 1308 } |
1309 if (xtty != NULL) | |
1310 xtty->name(class_name); | |
1311 } | |
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1312 if (xtty != NULL && trap_mdo != NULL) { |
0 | 1313 // Dump the relevant MDO state. |
1314 // This is the deopt count for the current reason, any previous | |
1315 // reasons or recompiles seen at this point. | |
1316 int dcnt = trap_mdo->trap_count(reason); | |
1317 if (dcnt != 0) | |
1318 xtty->print(" count='%d'", dcnt); | |
1319 ProfileData* pdata = trap_mdo->bci_to_data(trap_bci); | |
1320 int dos = (pdata == NULL)? 0: pdata->trap_state(); | |
1321 if (dos != 0) { | |
1322 xtty->print(" state='%s'", format_trap_state(buf, sizeof(buf), dos)); | |
1323 if (trap_state_is_recompiled(dos)) { | |
1324 int recnt2 = trap_mdo->overflow_recompile_count(); | |
1325 if (recnt2 != 0) | |
1326 xtty->print(" recompiles2='%d'", recnt2); | |
1327 } | |
1328 } | |
1329 } | |
1330 if (xtty != NULL) { | |
1331 xtty->stamp(); | |
1332 xtty->end_head(); | |
1333 } | |
1334 if (TraceDeoptimization) { // make noise on the tty | |
1335 tty->print("Uncommon trap occurred in"); | |
1336 nm->method()->print_short_name(tty); | |
6843 | 1337 tty->print(" (@" INTPTR_FORMAT ") thread=" UINTX_FORMAT " reason=%s action=%s unloaded_class_index=%d", |
0 | 1338 fr.pc(), |
6843 | 1339 os::current_thread_id(), |
0 | 1340 trap_reason_name(reason), |
1341 trap_action_name(action), | |
1342 unloaded_class_index); | |
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1343 if (class_name != NULL) { |
0 | 1344 tty->print(unresolved ? " unresolved class: " : " symbol: "); |
1345 class_name->print_symbol_on(tty); | |
1346 } | |
1347 tty->cr(); | |
1348 } | |
1349 if (xtty != NULL) { | |
1350 // Log the precise location of the trap. | |
1351 for (ScopeDesc* sd = trap_scope; ; sd = sd->sender()) { | |
1352 xtty->begin_elem("jvms bci='%d'", sd->bci()); | |
1353 xtty->method(sd->method()); | |
1354 xtty->end_elem(); | |
1355 if (sd->is_top()) break; | |
1356 } | |
1357 xtty->tail("uncommon_trap"); | |
1358 } | |
1359 } | |
1360 // (End diagnostic printout.) | |
1361 | |
1362 // Load class if necessary | |
1363 if (unloaded_class_index >= 0) { | |
1364 constantPoolHandle constants(THREAD, trap_method->constants()); | |
1365 load_class_by_index(constants, unloaded_class_index); | |
1366 } | |
1367 | |
1368 // Flush the nmethod if necessary and desirable. | |
1369 // | |
1370 // We need to avoid situations where we are re-flushing the nmethod | |
1371 // because of a hot deoptimization site. Repeated flushes at the same | |
1372 // point need to be detected by the compiler and avoided. If the compiler | |
1373 // cannot avoid them (or has a bug and "refuses" to avoid them), this | |
1374 // module must take measures to avoid an infinite cycle of recompilation | |
1375 // and deoptimization. There are several such measures: | |
1376 // | |
1377 // 1. If a recompilation is ordered a second time at some site X | |
1378 // and for the same reason R, the action is adjusted to 'reinterpret', | |
1379 // to give the interpreter time to exercise the method more thoroughly. | |
1380 // If this happens, the method's overflow_recompile_count is incremented. | |
1381 // | |
1382 // 2. If the compiler fails to reduce the deoptimization rate, then | |
1383 // the method's overflow_recompile_count will begin to exceed the set | |
1384 // limit PerBytecodeRecompilationCutoff. If this happens, the action | |
1385 // is adjusted to 'make_not_compilable', and the method is abandoned | |
1386 // to the interpreter. This is a performance hit for hot methods, | |
1387 // but is better than a disastrous infinite cycle of recompilations. | |
1388 // (Actually, only the method containing the site X is abandoned.) | |
1389 // | |
1390 // 3. In parallel with the previous measures, if the total number of | |
1391 // recompilations of a method exceeds the much larger set limit | |
1392 // PerMethodRecompilationCutoff, the method is abandoned. | |
1393 // This should only happen if the method is very large and has | |
1394 // many "lukewarm" deoptimizations. The code which enforces this | |
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1395 // limit is elsewhere (class nmethod, class Method). |
0 | 1396 // |
1397 // Note that the per-BCI 'is_recompiled' bit gives the compiler one chance | |
1398 // to recompile at each bytecode independently of the per-BCI cutoff. | |
1399 // | |
1400 // The decision to update code is up to the compiler, and is encoded | |
1401 // in the Action_xxx code. If the compiler requests Action_none | |
1402 // no trap state is changed, no compiled code is changed, and the | |
1403 // computation suffers along in the interpreter. | |
1404 // | |
1405 // The other action codes specify various tactics for decompilation | |
1406 // and recompilation. Action_maybe_recompile is the loosest, and | |
1407 // allows the compiled code to stay around until enough traps are seen, | |
1408 // and until the compiler gets around to recompiling the trapping method. | |
1409 // | |
1410 // The other actions cause immediate removal of the present code. | |
1411 | |
1412 bool update_trap_state = true; | |
1413 bool make_not_entrant = false; | |
1414 bool make_not_compilable = false; | |
1783 | 1415 bool reprofile = false; |
0 | 1416 switch (action) { |
1417 case Action_none: | |
1418 // Keep the old code. | |
1419 update_trap_state = false; | |
1420 break; | |
1421 case Action_maybe_recompile: | |
1422 // Do not need to invalidate the present code, but we can | |
1423 // initiate another | |
1424 // Start compiler without (necessarily) invalidating the nmethod. | |
1425 // The system will tolerate the old code, but new code should be | |
1426 // generated when possible. | |
1427 break; | |
1428 case Action_reinterpret: | |
1429 // Go back into the interpreter for a while, and then consider | |
1430 // recompiling form scratch. | |
1431 make_not_entrant = true; | |
1432 // Reset invocation counter for outer most method. | |
1433 // This will allow the interpreter to exercise the bytecodes | |
1434 // for a while before recompiling. | |
1435 // By contrast, Action_make_not_entrant is immediate. | |
1436 // | |
1437 // Note that the compiler will track null_check, null_assert, | |
1438 // range_check, and class_check events and log them as if they | |
1439 // had been traps taken from compiled code. This will update | |
1440 // the MDO trap history so that the next compilation will | |
1441 // properly detect hot trap sites. | |
1783 | 1442 reprofile = true; |
0 | 1443 break; |
1444 case Action_make_not_entrant: | |
1445 // Request immediate recompilation, and get rid of the old code. | |
1446 // Make them not entrant, so next time they are called they get | |
1447 // recompiled. Unloaded classes are loaded now so recompile before next | |
1448 // time they are called. Same for uninitialized. The interpreter will | |
1449 // link the missing class, if any. | |
1450 make_not_entrant = true; | |
1451 break; | |
1452 case Action_make_not_compilable: | |
1453 // Give up on compiling this method at all. | |
1454 make_not_entrant = true; | |
1455 make_not_compilable = true; | |
1456 break; | |
1457 default: | |
1458 ShouldNotReachHere(); | |
1459 } | |
1460 | |
1461 // Setting +ProfileTraps fixes the following, on all platforms: | |
1462 // 4852688: ProfileInterpreter is off by default for ia64. The result is | |
1463 // infinite heroic-opt-uncommon-trap/deopt/recompile cycles, since the | |
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1464 // recompile relies on a MethodData* to record heroic opt failures. |
0 | 1465 |
1466 // Whether the interpreter is producing MDO data or not, we also need | |
1467 // to use the MDO to detect hot deoptimization points and control | |
1468 // aggressive optimization. | |
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1469 bool inc_recompile_count = false; |
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1470 ProfileData* pdata = NULL; |
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1471 if (ProfileTraps && update_trap_state && trap_mdo != NULL) { |
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1472 assert(trap_mdo == get_method_data(thread, trap_method, false), "sanity"); |
0 | 1473 uint this_trap_count = 0; |
1474 bool maybe_prior_trap = false; | |
1475 bool maybe_prior_recompile = false; | |
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1476 pdata = query_update_method_data(trap_mdo, trap_bci, reason, |
0 | 1477 //outputs: |
1478 this_trap_count, | |
1479 maybe_prior_trap, | |
1480 maybe_prior_recompile); | |
1481 // Because the interpreter also counts null, div0, range, and class | |
1482 // checks, these traps from compiled code are double-counted. | |
1483 // This is harmless; it just means that the PerXTrapLimit values | |
1484 // are in effect a little smaller than they look. | |
1485 | |
1486 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
1487 if (per_bc_reason != Reason_none) { | |
1488 // Now take action based on the partially known per-BCI history. | |
1489 if (maybe_prior_trap | |
1490 && this_trap_count >= (uint)PerBytecodeTrapLimit) { | |
1491 // If there are too many traps at this BCI, force a recompile. | |
1492 // This will allow the compiler to see the limit overflow, and | |
1493 // take corrective action, if possible. The compiler generally | |
1494 // does not use the exact PerBytecodeTrapLimit value, but instead | |
1495 // changes its tactics if it sees any traps at all. This provides | |
1496 // a little hysteresis, delaying a recompile until a trap happens | |
1497 // several times. | |
1498 // | |
1499 // Actually, since there is only one bit of counter per BCI, | |
1500 // the possible per-BCI counts are {0,1,(per-method count)}. | |
1501 // This produces accurate results if in fact there is only | |
1502 // one hot trap site, but begins to get fuzzy if there are | |
1503 // many sites. For example, if there are ten sites each | |
1504 // trapping two or more times, they each get the blame for | |
1505 // all of their traps. | |
1506 make_not_entrant = true; | |
1507 } | |
1508 | |
1509 // Detect repeated recompilation at the same BCI, and enforce a limit. | |
1510 if (make_not_entrant && maybe_prior_recompile) { | |
1511 // More than one recompile at this point. | |
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1512 inc_recompile_count = maybe_prior_trap; |
0 | 1513 } |
1514 } else { | |
1515 // For reasons which are not recorded per-bytecode, we simply | |
1516 // force recompiles unconditionally. | |
1517 // (Note that PerMethodRecompilationCutoff is enforced elsewhere.) | |
1518 make_not_entrant = true; | |
1519 } | |
1520 | |
1521 // Go back to the compiler if there are too many traps in this method. | |
1522 if (this_trap_count >= (uint)PerMethodTrapLimit) { | |
1523 // If there are too many traps in this method, force a recompile. | |
1524 // This will allow the compiler to see the limit overflow, and | |
1525 // take corrective action, if possible. | |
1526 // (This condition is an unlikely backstop only, because the | |
1527 // PerBytecodeTrapLimit is more likely to take effect first, | |
1528 // if it is applicable.) | |
1529 make_not_entrant = true; | |
1530 } | |
1531 | |
1532 // Here's more hysteresis: If there has been a recompile at | |
1533 // this trap point already, run the method in the interpreter | |
1534 // for a while to exercise it more thoroughly. | |
1535 if (make_not_entrant && maybe_prior_recompile && maybe_prior_trap) { | |
1783 | 1536 reprofile = true; |
0 | 1537 } |
1538 | |
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1539 } |
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1540 |
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1541 // Take requested actions on the method: |
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1542 |
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1543 // Recompile |
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1544 if (make_not_entrant) { |
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1545 if (!nm->make_not_entrant()) { |
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1546 return; // the call did not change nmethod's state |
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1547 } |
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1548 |
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1549 if (pdata != NULL) { |
0 | 1550 // Record the recompilation event, if any. |
1551 int tstate0 = pdata->trap_state(); | |
1552 int tstate1 = trap_state_set_recompiled(tstate0, true); | |
1553 if (tstate1 != tstate0) | |
1554 pdata->set_trap_state(tstate1); | |
1555 } | |
1556 } | |
1557 | |
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1558 if (inc_recompile_count) { |
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1559 trap_mdo->inc_overflow_recompile_count(); |
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1560 if ((uint)trap_mdo->overflow_recompile_count() > |
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1561 (uint)PerBytecodeRecompilationCutoff) { |
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1562 // Give up on the method containing the bad BCI. |
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1563 if (trap_method() == nm->method()) { |
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1564 make_not_compilable = true; |
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1565 } else { |
7998 | 1566 trap_method->set_not_compilable(CompLevel_full_optimization, true, "overflow_recompile_count > PerBytecodeRecompilationCutoff"); |
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1567 // But give grace to the enclosing nm->method(). |
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1568 } |
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1569 } |
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1570 } |
0 | 1571 |
1783 | 1572 // Reprofile |
1573 if (reprofile) { | |
1574 CompilationPolicy::policy()->reprofile(trap_scope, nm->is_osr_method()); | |
0 | 1575 } |
1576 | |
1577 // Give up compiling | |
1783 | 1578 if (make_not_compilable && !nm->method()->is_not_compilable(CompLevel_full_optimization)) { |
0 | 1579 assert(make_not_entrant, "consistent"); |
1783 | 1580 nm->method()->set_not_compilable(CompLevel_full_optimization); |
0 | 1581 } |
1582 | |
1583 } // Free marked resources | |
1584 | |
1585 } | |
1586 JRT_END | |
1587 | |
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1588 MethodData* |
0 | 1589 Deoptimization::get_method_data(JavaThread* thread, methodHandle m, |
1590 bool create_if_missing) { | |
1591 Thread* THREAD = thread; | |
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1592 MethodData* mdo = m()->method_data(); |
0 | 1593 if (mdo == NULL && create_if_missing && !HAS_PENDING_EXCEPTION) { |
1594 // Build an MDO. Ignore errors like OutOfMemory; | |
1595 // that simply means we won't have an MDO to update. | |
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1596 Method::build_interpreter_method_data(m, THREAD); |
0 | 1597 if (HAS_PENDING_EXCEPTION) { |
1598 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); | |
1599 CLEAR_PENDING_EXCEPTION; | |
1600 } | |
1601 mdo = m()->method_data(); | |
1602 } | |
1603 return mdo; | |
1604 } | |
1605 | |
1606 ProfileData* | |
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1607 Deoptimization::query_update_method_data(MethodData* trap_mdo, |
0 | 1608 int trap_bci, |
1609 Deoptimization::DeoptReason reason, | |
1610 //outputs: | |
1611 uint& ret_this_trap_count, | |
1612 bool& ret_maybe_prior_trap, | |
1613 bool& ret_maybe_prior_recompile) { | |
1614 uint prior_trap_count = trap_mdo->trap_count(reason); | |
1615 uint this_trap_count = trap_mdo->inc_trap_count(reason); | |
1616 | |
1617 // If the runtime cannot find a place to store trap history, | |
1618 // it is estimated based on the general condition of the method. | |
1619 // If the method has ever been recompiled, or has ever incurred | |
1620 // a trap with the present reason , then this BCI is assumed | |
1621 // (pessimistically) to be the culprit. | |
1622 bool maybe_prior_trap = (prior_trap_count != 0); | |
1623 bool maybe_prior_recompile = (trap_mdo->decompile_count() != 0); | |
1624 ProfileData* pdata = NULL; | |
1625 | |
1626 | |
1627 // For reasons which are recorded per bytecode, we check per-BCI data. | |
1628 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
1629 if (per_bc_reason != Reason_none) { | |
1630 // Find the profile data for this BCI. If there isn't one, | |
1631 // try to allocate one from the MDO's set of spares. | |
1632 // This will let us detect a repeated trap at this point. | |
1633 pdata = trap_mdo->allocate_bci_to_data(trap_bci); | |
1634 | |
1635 if (pdata != NULL) { | |
1636 // Query the trap state of this profile datum. | |
1637 int tstate0 = pdata->trap_state(); | |
1638 if (!trap_state_has_reason(tstate0, per_bc_reason)) | |
1639 maybe_prior_trap = false; | |
1640 if (!trap_state_is_recompiled(tstate0)) | |
1641 maybe_prior_recompile = false; | |
1642 | |
1643 // Update the trap state of this profile datum. | |
1644 int tstate1 = tstate0; | |
1645 // Record the reason. | |
1646 tstate1 = trap_state_add_reason(tstate1, per_bc_reason); | |
1647 // Store the updated state on the MDO, for next time. | |
1648 if (tstate1 != tstate0) | |
1649 pdata->set_trap_state(tstate1); | |
1650 } else { | |
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1651 if (LogCompilation && xtty != NULL) { |
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1652 ttyLocker ttyl; |
0 | 1653 // Missing MDP? Leave a small complaint in the log. |
1654 xtty->elem("missing_mdp bci='%d'", trap_bci); | |
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1655 } |
0 | 1656 } |
1657 } | |
1658 | |
1659 // Return results: | |
1660 ret_this_trap_count = this_trap_count; | |
1661 ret_maybe_prior_trap = maybe_prior_trap; | |
1662 ret_maybe_prior_recompile = maybe_prior_recompile; | |
1663 return pdata; | |
1664 } | |
1665 | |
1666 void | |
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1667 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
0 | 1668 ResourceMark rm; |
1669 // Ignored outputs: | |
1670 uint ignore_this_trap_count; | |
1671 bool ignore_maybe_prior_trap; | |
1672 bool ignore_maybe_prior_recompile; | |
1673 query_update_method_data(trap_mdo, trap_bci, | |
1674 (DeoptReason)reason, | |
1675 ignore_this_trap_count, | |
1676 ignore_maybe_prior_trap, | |
1677 ignore_maybe_prior_recompile); | |
1678 } | |
1679 | |
1680 Deoptimization::UnrollBlock* Deoptimization::uncommon_trap(JavaThread* thread, jint trap_request) { | |
1681 | |
1682 // Still in Java no safepoints | |
1683 { | |
1684 // This enters VM and may safepoint | |
1685 uncommon_trap_inner(thread, trap_request); | |
1686 } | |
1687 return fetch_unroll_info_helper(thread); | |
1688 } | |
1689 | |
1690 // Local derived constants. | |
1691 // Further breakdown of DataLayout::trap_state, as promised by DataLayout. | |
1692 const int DS_REASON_MASK = DataLayout::trap_mask >> 1; | |
1693 const int DS_RECOMPILE_BIT = DataLayout::trap_mask - DS_REASON_MASK; | |
1694 | |
1695 //---------------------------trap_state_reason--------------------------------- | |
1696 Deoptimization::DeoptReason | |
1697 Deoptimization::trap_state_reason(int trap_state) { | |
1698 // This assert provides the link between the width of DataLayout::trap_bits | |
1699 // and the encoding of "recorded" reasons. It ensures there are enough | |
1700 // bits to store all needed reasons in the per-BCI MDO profile. | |
1701 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
1702 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1703 trap_state -= recompile_bit; | |
1704 if (trap_state == DS_REASON_MASK) { | |
1705 return Reason_many; | |
1706 } else { | |
1707 assert((int)Reason_none == 0, "state=0 => Reason_none"); | |
1708 return (DeoptReason)trap_state; | |
1709 } | |
1710 } | |
1711 //-------------------------trap_state_has_reason------------------------------- | |
1712 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
1713 assert(reason_is_recorded_per_bytecode((DeoptReason)reason), "valid reason"); | |
1714 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
1715 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1716 trap_state -= recompile_bit; | |
1717 if (trap_state == DS_REASON_MASK) { | |
1718 return -1; // true, unspecifically (bottom of state lattice) | |
1719 } else if (trap_state == reason) { | |
1720 return 1; // true, definitely | |
1721 } else if (trap_state == 0) { | |
1722 return 0; // false, definitely (top of state lattice) | |
1723 } else { | |
1724 return 0; // false, definitely | |
1725 } | |
1726 } | |
1727 //-------------------------trap_state_add_reason------------------------------- | |
1728 int Deoptimization::trap_state_add_reason(int trap_state, int reason) { | |
1729 assert(reason_is_recorded_per_bytecode((DeoptReason)reason) || reason == Reason_many, "valid reason"); | |
1730 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1731 trap_state -= recompile_bit; | |
1732 if (trap_state == DS_REASON_MASK) { | |
1733 return trap_state + recompile_bit; // already at state lattice bottom | |
1734 } else if (trap_state == reason) { | |
1735 return trap_state + recompile_bit; // the condition is already true | |
1736 } else if (trap_state == 0) { | |
1737 return reason + recompile_bit; // no condition has yet been true | |
1738 } else { | |
1739 return DS_REASON_MASK + recompile_bit; // fall to state lattice bottom | |
1740 } | |
1741 } | |
1742 //-----------------------trap_state_is_recompiled------------------------------ | |
1743 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
1744 return (trap_state & DS_RECOMPILE_BIT) != 0; | |
1745 } | |
1746 //-----------------------trap_state_set_recompiled----------------------------- | |
1747 int Deoptimization::trap_state_set_recompiled(int trap_state, bool z) { | |
1748 if (z) return trap_state | DS_RECOMPILE_BIT; | |
1749 else return trap_state & ~DS_RECOMPILE_BIT; | |
1750 } | |
1751 //---------------------------format_trap_state--------------------------------- | |
1752 // This is used for debugging and diagnostics, including hotspot.log output. | |
1753 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
1754 int trap_state) { | |
1755 DeoptReason reason = trap_state_reason(trap_state); | |
1756 bool recomp_flag = trap_state_is_recompiled(trap_state); | |
1757 // Re-encode the state from its decoded components. | |
1758 int decoded_state = 0; | |
1759 if (reason_is_recorded_per_bytecode(reason) || reason == Reason_many) | |
1760 decoded_state = trap_state_add_reason(decoded_state, reason); | |
1761 if (recomp_flag) | |
1762 decoded_state = trap_state_set_recompiled(decoded_state, recomp_flag); | |
1763 // If the state re-encodes properly, format it symbolically. | |
1764 // Because this routine is used for debugging and diagnostics, | |
1765 // be robust even if the state is a strange value. | |
1766 size_t len; | |
1767 if (decoded_state != trap_state) { | |
1768 // Random buggy state that doesn't decode?? | |
1769 len = jio_snprintf(buf, buflen, "#%d", trap_state); | |
1770 } else { | |
1771 len = jio_snprintf(buf, buflen, "%s%s", | |
1772 trap_reason_name(reason), | |
1773 recomp_flag ? " recompiled" : ""); | |
1774 } | |
1775 if (len >= buflen) | |
1776 buf[buflen-1] = '\0'; | |
1777 return buf; | |
1778 } | |
1779 | |
1780 | |
1781 //--------------------------------statics-------------------------------------- | |
1782 Deoptimization::DeoptAction Deoptimization::_unloaded_action | |
1783 = Deoptimization::Action_reinterpret; | |
1784 const char* Deoptimization::_trap_reason_name[Reason_LIMIT] = { | |
1785 // Note: Keep this in sync. with enum DeoptReason. | |
1786 "none", | |
1787 "null_check", | |
1788 "null_assert", | |
1789 "range_check", | |
1790 "class_check", | |
1791 "array_check", | |
1792 "intrinsic", | |
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1793 "bimorphic", |
0 | 1794 "unloaded", |
1795 "uninitialized", | |
1796 "unreached", | |
1797 "unhandled", | |
1798 "constraint", | |
1799 "div0_check", | |
1172 | 1800 "age", |
3345 | 1801 "predicate", |
1802 "loop_limit_check" | |
0 | 1803 }; |
1804 const char* Deoptimization::_trap_action_name[Action_LIMIT] = { | |
1805 // Note: Keep this in sync. with enum DeoptAction. | |
1806 "none", | |
1807 "maybe_recompile", | |
1808 "reinterpret", | |
1809 "make_not_entrant", | |
1810 "make_not_compilable" | |
1811 }; | |
1812 | |
1813 const char* Deoptimization::trap_reason_name(int reason) { | |
1814 if (reason == Reason_many) return "many"; | |
1815 if ((uint)reason < Reason_LIMIT) | |
1816 return _trap_reason_name[reason]; | |
1817 static char buf[20]; | |
1818 sprintf(buf, "reason%d", reason); | |
1819 return buf; | |
1820 } | |
1821 const char* Deoptimization::trap_action_name(int action) { | |
1822 if ((uint)action < Action_LIMIT) | |
1823 return _trap_action_name[action]; | |
1824 static char buf[20]; | |
1825 sprintf(buf, "action%d", action); | |
1826 return buf; | |
1827 } | |
1828 | |
1829 // This is used for debugging and diagnostics, including hotspot.log output. | |
1830 const char* Deoptimization::format_trap_request(char* buf, size_t buflen, | |
1831 int trap_request) { | |
1832 jint unloaded_class_index = trap_request_index(trap_request); | |
1833 const char* reason = trap_reason_name(trap_request_reason(trap_request)); | |
1834 const char* action = trap_action_name(trap_request_action(trap_request)); | |
1835 size_t len; | |
1836 if (unloaded_class_index < 0) { | |
1837 len = jio_snprintf(buf, buflen, "reason='%s' action='%s'", | |
1838 reason, action); | |
1839 } else { | |
1840 len = jio_snprintf(buf, buflen, "reason='%s' action='%s' index='%d'", | |
1841 reason, action, unloaded_class_index); | |
1842 } | |
1843 if (len >= buflen) | |
1844 buf[buflen-1] = '\0'; | |
1845 return buf; | |
1846 } | |
1847 | |
1848 juint Deoptimization::_deoptimization_hist | |
1849 [Deoptimization::Reason_LIMIT] | |
1850 [1 + Deoptimization::Action_LIMIT] | |
1851 [Deoptimization::BC_CASE_LIMIT] | |
1852 = {0}; | |
1853 | |
1854 enum { | |
1855 LSB_BITS = 8, | |
1856 LSB_MASK = right_n_bits(LSB_BITS) | |
1857 }; | |
1858 | |
1859 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
1860 Bytecodes::Code bc) { | |
1861 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
1862 assert(action >= 0 && action < Action_LIMIT, "oob"); | |
1863 _deoptimization_hist[Reason_none][0][0] += 1; // total | |
1864 _deoptimization_hist[reason][0][0] += 1; // per-reason total | |
1865 juint* cases = _deoptimization_hist[reason][1+action]; | |
1866 juint* bc_counter_addr = NULL; | |
1867 juint bc_counter = 0; | |
1868 // Look for an unused counter, or an exact match to this BC. | |
1869 if (bc != Bytecodes::_illegal) { | |
1870 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
1871 juint* counter_addr = &cases[bc_case]; | |
1872 juint counter = *counter_addr; | |
1873 if ((counter == 0 && bc_counter_addr == NULL) | |
1874 || (Bytecodes::Code)(counter & LSB_MASK) == bc) { | |
1875 // this counter is either free or is already devoted to this BC | |
1876 bc_counter_addr = counter_addr; | |
1877 bc_counter = counter | bc; | |
1878 } | |
1879 } | |
1880 } | |
1881 if (bc_counter_addr == NULL) { | |
1882 // Overflow, or no given bytecode. | |
1883 bc_counter_addr = &cases[BC_CASE_LIMIT-1]; | |
1884 bc_counter = (*bc_counter_addr & ~LSB_MASK); // clear LSB | |
1885 } | |
1886 *bc_counter_addr = bc_counter + (1 << LSB_BITS); | |
1887 } | |
1888 | |
1889 jint Deoptimization::total_deoptimization_count() { | |
1890 return _deoptimization_hist[Reason_none][0][0]; | |
1891 } | |
1892 | |
1893 jint Deoptimization::deoptimization_count(DeoptReason reason) { | |
1894 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
1895 return _deoptimization_hist[reason][0][0]; | |
1896 } | |
1897 | |
1898 void Deoptimization::print_statistics() { | |
1899 juint total = total_deoptimization_count(); | |
1900 juint account = total; | |
1901 if (total != 0) { | |
1902 ttyLocker ttyl; | |
1903 if (xtty != NULL) xtty->head("statistics type='deoptimization'"); | |
1904 tty->print_cr("Deoptimization traps recorded:"); | |
1905 #define PRINT_STAT_LINE(name, r) \ | |
1906 tty->print_cr(" %4d (%4.1f%%) %s", (int)(r), ((r) * 100.0) / total, name); | |
1907 PRINT_STAT_LINE("total", total); | |
1908 // For each non-zero entry in the histogram, print the reason, | |
1909 // the action, and (if specifically known) the type of bytecode. | |
1910 for (int reason = 0; reason < Reason_LIMIT; reason++) { | |
1911 for (int action = 0; action < Action_LIMIT; action++) { | |
1912 juint* cases = _deoptimization_hist[reason][1+action]; | |
1913 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
1914 juint counter = cases[bc_case]; | |
1915 if (counter != 0) { | |
1916 char name[1*K]; | |
1917 Bytecodes::Code bc = (Bytecodes::Code)(counter & LSB_MASK); | |
1918 if (bc_case == BC_CASE_LIMIT && (int)bc == 0) | |
1919 bc = Bytecodes::_illegal; | |
1920 sprintf(name, "%s/%s/%s", | |
1921 trap_reason_name(reason), | |
1922 trap_action_name(action), | |
1923 Bytecodes::is_defined(bc)? Bytecodes::name(bc): "other"); | |
1924 juint r = counter >> LSB_BITS; | |
1925 tty->print_cr(" %40s: " UINT32_FORMAT " (%.1f%%)", name, r, (r * 100.0) / total); | |
1926 account -= r; | |
1927 } | |
1928 } | |
1929 } | |
1930 } | |
1931 if (account != 0) { | |
1932 PRINT_STAT_LINE("unaccounted", account); | |
1933 } | |
1934 #undef PRINT_STAT_LINE | |
1935 if (xtty != NULL) xtty->tail("statistics"); | |
1936 } | |
1937 } | |
1692 | 1938 #else // COMPILER2 || SHARK |
0 | 1939 |
1940 | |
1941 // Stubs for C1 only system. | |
1942 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
1943 return false; | |
1944 } | |
1945 | |
1946 const char* Deoptimization::trap_reason_name(int reason) { | |
1947 return "unknown"; | |
1948 } | |
1949 | |
1950 void Deoptimization::print_statistics() { | |
1951 // no output | |
1952 } | |
1953 | |
1954 void | |
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1955 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
0 | 1956 // no udpate |
1957 } | |
1958 | |
1959 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
1960 return 0; | |
1961 } | |
1962 | |
1963 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
1964 Bytecodes::Code bc) { | |
1965 // no update | |
1966 } | |
1967 | |
1968 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
1969 int trap_state) { | |
1970 jio_snprintf(buf, buflen, "#%d", trap_state); | |
1971 return buf; | |
1972 } | |
1973 | |
1692 | 1974 #endif // COMPILER2 || SHARK |