Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/deoptimization.cpp @ 20706:793204f5528a
8067144: SIGSEGV with +TraceDeoptimization in Deoptimization::print_objects
Summary: -XX:+TraceDeoptimization tries to print realloc'ed objects even when there are none
Reviewed-by: kvn
author | roland |
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date | Wed, 10 Dec 2014 16:45:55 +0100 |
parents | d3f3f7677537 |
children | 7848fc12602b ddce0b7cee93 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 |
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92 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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93 |
0 | 94 bool DeoptimizationMarker::_is_active = false; |
95 | |
96 Deoptimization::UnrollBlock::UnrollBlock(int size_of_deoptimized_frame, | |
97 int caller_adjustment, | |
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98 int caller_actual_parameters, |
0 | 99 int number_of_frames, |
100 intptr_t* frame_sizes, | |
101 address* frame_pcs, | |
102 BasicType return_type) { | |
103 _size_of_deoptimized_frame = size_of_deoptimized_frame; | |
104 _caller_adjustment = caller_adjustment; | |
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105 _caller_actual_parameters = caller_actual_parameters; |
0 | 106 _number_of_frames = number_of_frames; |
107 _frame_sizes = frame_sizes; | |
108 _frame_pcs = frame_pcs; | |
6197 | 109 _register_block = NEW_C_HEAP_ARRAY(intptr_t, RegisterMap::reg_count * 2, mtCompiler); |
0 | 110 _return_type = return_type; |
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111 _initial_info = 0; |
0 | 112 // PD (x86 only) |
113 _counter_temp = 0; | |
114 _unpack_kind = 0; | |
115 _sender_sp_temp = 0; | |
116 | |
117 _total_frame_sizes = size_of_frames(); | |
118 } | |
119 | |
120 | |
121 Deoptimization::UnrollBlock::~UnrollBlock() { | |
6197 | 122 FREE_C_HEAP_ARRAY(intptr_t, _frame_sizes, mtCompiler); |
123 FREE_C_HEAP_ARRAY(intptr_t, _frame_pcs, mtCompiler); | |
124 FREE_C_HEAP_ARRAY(intptr_t, _register_block, mtCompiler); | |
0 | 125 } |
126 | |
127 | |
128 intptr_t* Deoptimization::UnrollBlock::value_addr_at(int register_number) const { | |
129 assert(register_number < RegisterMap::reg_count, "checking register number"); | |
130 return &_register_block[register_number * 2]; | |
131 } | |
132 | |
133 | |
134 | |
135 int Deoptimization::UnrollBlock::size_of_frames() const { | |
136 // Acount first for the adjustment of the initial frame | |
137 int result = _caller_adjustment; | |
138 for (int index = 0; index < number_of_frames(); index++) { | |
139 result += frame_sizes()[index]; | |
140 } | |
141 return result; | |
142 } | |
143 | |
144 | |
145 void Deoptimization::UnrollBlock::print() { | |
146 ttyLocker ttyl; | |
147 tty->print_cr("UnrollBlock"); | |
148 tty->print_cr(" size_of_deoptimized_frame = %d", _size_of_deoptimized_frame); | |
149 tty->print( " frame_sizes: "); | |
150 for (int index = 0; index < number_of_frames(); index++) { | |
151 tty->print("%d ", frame_sizes()[index]); | |
152 } | |
153 tty->cr(); | |
154 } | |
155 | |
156 | |
157 // In order to make fetch_unroll_info work properly with escape | |
158 // analysis, The method was changed from JRT_LEAF to JRT_BLOCK_ENTRY and | |
159 // ResetNoHandleMark and HandleMark were removed from it. The actual reallocation | |
160 // of previously eliminated objects occurs in realloc_objects, which is | |
161 // called from the method fetch_unroll_info_helper below. | |
162 JRT_BLOCK_ENTRY(Deoptimization::UnrollBlock*, Deoptimization::fetch_unroll_info(JavaThread* thread)) | |
163 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
164 // but makes the entry a little slower. There is however a little dance we have to | |
165 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
166 | |
167 // fetch_unroll_info() is called at the beginning of the deoptimization | |
168 // handler. Note this fact before we start generating temporary frames | |
169 // that can confuse an asynchronous stack walker. This counter is | |
170 // decremented at the end of unpack_frames(). | |
171 thread->inc_in_deopt_handler(); | |
172 | |
173 return fetch_unroll_info_helper(thread); | |
174 JRT_END | |
175 | |
176 | |
177 // This is factored, since it is both called from a JRT_LEAF (deoptimization) and a JRT_ENTRY (uncommon_trap) | |
178 Deoptimization::UnrollBlock* Deoptimization::fetch_unroll_info_helper(JavaThread* thread) { | |
179 | |
180 // Note: there is a safepoint safety issue here. No matter whether we enter | |
181 // via vanilla deopt or uncommon trap we MUST NOT stop at a safepoint once | |
182 // the vframeArray is created. | |
183 // | |
184 | |
185 // Allocate our special deoptimization ResourceMark | |
186 DeoptResourceMark* dmark = new DeoptResourceMark(thread); | |
187 assert(thread->deopt_mark() == NULL, "Pending deopt!"); | |
188 thread->set_deopt_mark(dmark); | |
189 | |
190 frame stub_frame = thread->last_frame(); // Makes stack walkable as side effect | |
191 RegisterMap map(thread, true); | |
192 RegisterMap dummy_map(thread, false); | |
193 // Now get the deoptee with a valid map | |
194 frame deoptee = stub_frame.sender(&map); | |
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195 // Set the deoptee nmethod |
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196 assert(thread->deopt_nmethod() == NULL, "Pending deopt!"); |
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197 thread->set_deopt_nmethod(deoptee.cb()->as_nmethod_or_null()); |
0 | 198 |
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199 if (VerifyStack) { |
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200 thread->validate_frame_layout(); |
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201 } |
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202 |
0 | 203 // Create a growable array of VFrames where each VFrame represents an inlined |
204 // Java frame. This storage is allocated with the usual system arena. | |
205 assert(deoptee.is_compiled_frame(), "Wrong frame type"); | |
206 GrowableArray<compiledVFrame*>* chunk = new GrowableArray<compiledVFrame*>(10); | |
207 vframe* vf = vframe::new_vframe(&deoptee, &map, thread); | |
208 while (!vf->is_top()) { | |
209 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
210 chunk->push(compiledVFrame::cast(vf)); | |
211 vf = vf->sender(); | |
212 } | |
213 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
214 chunk->push(compiledVFrame::cast(vf)); | |
215 | |
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216 bool realloc_failures = false; |
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217 |
0 | 218 #ifdef COMPILER2 |
219 // Reallocate the non-escaping objects and restore their fields. Then | |
220 // relock objects if synchronization on them was eliminated. | |
4777 | 221 if (DoEscapeAnalysis || EliminateNestedLocks) { |
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222 if (EliminateAllocations) { |
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223 assert (chunk->at(0)->scope() != NULL,"expect only compiled java frames"); |
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224 GrowableArray<ScopeValue*>* objects = chunk->at(0)->scope()->objects(); |
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225 |
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226 // The flag return_oop() indicates call sites which return oop |
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227 // in compiled code. Such sites include java method calls, |
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228 // runtime calls (for example, used to allocate new objects/arrays |
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229 // on slow code path) and any other calls generated in compiled code. |
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230 // It is not guaranteed that we can get such information here only |
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231 // by analyzing bytecode in deoptimized frames. This is why this flag |
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232 // is set during method compilation (see Compile::Process_OopMap_Node()). |
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233 // If the previous frame was popped, we don't have a result. |
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234 bool save_oop_result = chunk->at(0)->scope()->return_oop() && !thread->popframe_forcing_deopt_reexecution(); |
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235 Handle return_value; |
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236 if (save_oop_result) { |
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237 // Reallocation may trigger GC. If deoptimization happened on return from |
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238 // call which returns oop we need to save it since it is not in oopmap. |
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239 oop result = deoptee.saved_oop_result(&map); |
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240 assert(result == NULL || result->is_oop(), "must be oop"); |
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241 return_value = Handle(thread, result); |
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242 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); |
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243 if (TraceDeoptimization) { |
6843 | 244 ttyLocker ttyl; |
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245 tty->print_cr("SAVED OOP RESULT " INTPTR_FORMAT " in thread " INTPTR_FORMAT, (void *)result, thread); |
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246 } |
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247 } |
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248 if (objects != NULL) { |
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249 JRT_BLOCK |
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250 realloc_failures = realloc_objects(thread, &deoptee, objects, THREAD); |
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251 JRT_END |
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252 reassign_fields(&deoptee, &map, objects, realloc_failures); |
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253 #ifndef PRODUCT |
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254 if (TraceDeoptimization) { |
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255 ttyLocker ttyl; |
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256 tty->print_cr("REALLOC OBJECTS in thread " INTPTR_FORMAT, thread); |
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257 print_objects(objects, realloc_failures); |
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258 } |
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259 #endif |
0 | 260 } |
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261 if (save_oop_result) { |
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262 // Restore result. |
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263 deoptee.set_saved_oop_result(&map, return_value()); |
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264 } |
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265 } |
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266 if (EliminateLocks) { |
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267 #ifndef PRODUCT |
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268 bool first = true; |
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269 #endif |
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270 for (int i = 0; i < chunk->length(); i++) { |
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271 compiledVFrame* cvf = chunk->at(i); |
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272 assert (cvf->scope() != NULL,"expect only compiled java frames"); |
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273 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); |
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274 if (monitors->is_nonempty()) { |
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275 relock_objects(monitors, thread, realloc_failures); |
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276 #ifndef PRODUCT |
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277 if (TraceDeoptimization) { |
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278 ttyLocker ttyl; |
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279 for (int j = 0; j < monitors->length(); j++) { |
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280 MonitorInfo* mi = monitors->at(j); |
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281 if (mi->eliminated()) { |
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282 if (first) { |
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283 first = false; |
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284 tty->print_cr("RELOCK OBJECTS in thread " INTPTR_FORMAT, thread); |
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285 } |
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286 if (mi->owner_is_scalar_replaced()) { |
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287 Klass* k = java_lang_Class::as_Klass(mi->owner_klass()); |
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288 tty->print_cr(" failed reallocation for klass %s", k->external_name()); |
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289 } else { |
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290 tty->print_cr(" object <" INTPTR_FORMAT "> locked", (void *)mi->owner()); |
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291 } |
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292 } |
0 | 293 } |
294 } | |
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295 #endif |
0 | 296 } |
297 } | |
298 } | |
299 } | |
300 #endif // COMPILER2 | |
301 // Ensure that no safepoint is taken after pointers have been stored | |
302 // in fields of rematerialized objects. If a safepoint occurs from here on | |
303 // out the java state residing in the vframeArray will be missed. | |
304 No_Safepoint_Verifier no_safepoint; | |
305 | |
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306 vframeArray* array = create_vframeArray(thread, deoptee, &map, chunk, realloc_failures); |
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307 #ifdef COMPILER2 |
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308 if (realloc_failures) { |
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309 pop_frames_failed_reallocs(thread, array); |
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310 } |
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311 #endif |
0 | 312 |
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313 assert(thread->vframe_array_head() == NULL, "Pending deopt!"); |
0 | 314 thread->set_vframe_array_head(array); |
315 | |
316 // Now that the vframeArray has been created if we have any deferred local writes | |
317 // added by jvmti then we can free up that structure as the data is now in the | |
318 // vframeArray | |
319 | |
320 if (thread->deferred_locals() != NULL) { | |
321 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread->deferred_locals(); | |
322 int i = 0; | |
323 do { | |
324 // Because of inlining we could have multiple vframes for a single frame | |
325 // and several of the vframes could have deferred writes. Find them all. | |
326 if (list->at(i)->id() == array->original().id()) { | |
327 jvmtiDeferredLocalVariableSet* dlv = list->at(i); | |
328 list->remove_at(i); | |
329 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
330 delete dlv; | |
331 } else { | |
332 i++; | |
333 } | |
334 } while ( i < list->length() ); | |
335 if (list->length() == 0) { | |
336 thread->set_deferred_locals(NULL); | |
337 // free the list and elements back to C heap. | |
338 delete list; | |
339 } | |
340 | |
341 } | |
342 | |
1692 | 343 #ifndef SHARK |
0 | 344 // Compute the caller frame based on the sender sp of stub_frame and stored frame sizes info. |
345 CodeBlob* cb = stub_frame.cb(); | |
346 // Verify we have the right vframeArray | |
347 assert(cb->frame_size() >= 0, "Unexpected frame size"); | |
348 intptr_t* unpack_sp = stub_frame.sp() + cb->frame_size(); | |
349 | |
1204 | 350 // If the deopt call site is a MethodHandle invoke call site we have |
351 // to adjust the unpack_sp. | |
352 nmethod* deoptee_nm = deoptee.cb()->as_nmethod_or_null(); | |
353 if (deoptee_nm != NULL && deoptee_nm->is_method_handle_return(deoptee.pc())) | |
354 unpack_sp = deoptee.unextended_sp(); | |
355 | |
0 | 356 #ifdef ASSERT |
357 assert(cb->is_deoptimization_stub() || cb->is_uncommon_trap_stub(), "just checking"); | |
358 #endif | |
1692 | 359 #else |
360 intptr_t* unpack_sp = stub_frame.sender(&dummy_map).unextended_sp(); | |
361 #endif // !SHARK | |
362 | |
0 | 363 // This is a guarantee instead of an assert because if vframe doesn't match |
364 // we will unpack the wrong deoptimized frame and wind up in strange places | |
365 // where it will be very difficult to figure out what went wrong. Better | |
366 // to die an early death here than some very obscure death later when the | |
367 // trail is cold. | |
368 // Note: on ia64 this guarantee can be fooled by frames with no memory stack | |
369 // in that it will fail to detect a problem when there is one. This needs | |
370 // more work in tiger timeframe. | |
371 guarantee(array->unextended_sp() == unpack_sp, "vframe_array_head must contain the vframeArray to unpack"); | |
372 | |
373 int number_of_frames = array->frames(); | |
374 | |
375 // Compute the vframes' sizes. Note that frame_sizes[] entries are ordered from outermost to innermost | |
376 // virtual activation, which is the reverse of the elements in the vframes array. | |
6197 | 377 intptr_t* frame_sizes = NEW_C_HEAP_ARRAY(intptr_t, number_of_frames, mtCompiler); |
0 | 378 // +1 because we always have an interpreter return address for the final slot. |
6197 | 379 address* frame_pcs = NEW_C_HEAP_ARRAY(address, number_of_frames + 1, mtCompiler); |
0 | 380 int popframe_extra_args = 0; |
381 // Create an interpreter return address for the stub to use as its return | |
382 // address so the skeletal frames are perfectly walkable | |
383 frame_pcs[number_of_frames] = Interpreter::deopt_entry(vtos, 0); | |
384 | |
385 // PopFrame requires that the preserved incoming arguments from the recently-popped topmost | |
386 // activation be put back on the expression stack of the caller for reexecution | |
387 if (JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) { | |
388 popframe_extra_args = in_words(thread->popframe_preserved_args_size_in_words()); | |
389 } | |
390 | |
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391 // Find the current pc for sender of the deoptee. Since the sender may have been deoptimized |
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392 // itself since the deoptee vframeArray was created we must get a fresh value of the pc rather |
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393 // than simply use array->sender.pc(). This requires us to walk the current set of frames |
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394 // |
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395 frame deopt_sender = stub_frame.sender(&dummy_map); // First is the deoptee frame |
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396 deopt_sender = deopt_sender.sender(&dummy_map); // Now deoptee caller |
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397 |
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398 // It's possible that the number of paramters at the call site is |
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399 // different than number of arguments in the callee when method |
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400 // handles are used. If the caller is interpreted get the real |
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401 // value so that the proper amount of space can be added to it's |
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402 // frame. |
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403 bool caller_was_method_handle = false; |
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404 if (deopt_sender.is_interpreted_frame()) { |
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405 methodHandle method = deopt_sender.interpreter_frame_method(); |
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406 Bytecode_invoke cur = Bytecode_invoke_check(method, deopt_sender.interpreter_frame_bci()); |
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407 if (cur.is_invokedynamic() || cur.is_invokehandle()) { |
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408 // Method handle invokes may involve fairly arbitrary chains of |
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409 // calls so it's impossible to know how much actual space the |
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410 // caller has for locals. |
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411 caller_was_method_handle = true; |
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412 } |
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413 } |
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414 |
0 | 415 // |
416 // frame_sizes/frame_pcs[0] oldest frame (int or c2i) | |
417 // frame_sizes/frame_pcs[1] next oldest frame (int) | |
418 // frame_sizes/frame_pcs[n] youngest frame (int) | |
419 // | |
420 // Now a pc in frame_pcs is actually the return address to the frame's caller (a frame | |
421 // owns the space for the return address to it's caller). Confusing ain't it. | |
422 // | |
423 // The vframe array can address vframes with indices running from | |
424 // 0.._frames-1. Index 0 is the youngest frame and _frame - 1 is the oldest (root) frame. | |
425 // When we create the skeletal frames we need the oldest frame to be in the zero slot | |
426 // in the frame_sizes/frame_pcs so the assembly code can do a trivial walk. | |
427 // so things look a little strange in this loop. | |
428 // | |
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429 int callee_parameters = 0; |
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430 int callee_locals = 0; |
0 | 431 for (int index = 0; index < array->frames(); index++ ) { |
432 // frame[number_of_frames - 1 ] = on_stack_size(youngest) | |
433 // frame[number_of_frames - 2 ] = on_stack_size(sender(youngest)) | |
434 // frame[number_of_frames - 3 ] = on_stack_size(sender(sender(youngest))) | |
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435 frame_sizes[number_of_frames - 1 - index] = BytesPerWord * array->element(index)->on_stack_size(callee_parameters, |
0 | 436 callee_locals, |
437 index == 0, | |
438 popframe_extra_args); | |
439 // This pc doesn't have to be perfect just good enough to identify the frame | |
440 // as interpreted so the skeleton frame will be walkable | |
441 // The correct pc will be set when the skeleton frame is completely filled out | |
442 // The final pc we store in the loop is wrong and will be overwritten below | |
443 frame_pcs[number_of_frames - 1 - index ] = Interpreter::deopt_entry(vtos, 0) - frame::pc_return_offset; | |
444 | |
445 callee_parameters = array->element(index)->method()->size_of_parameters(); | |
446 callee_locals = array->element(index)->method()->max_locals(); | |
447 popframe_extra_args = 0; | |
448 } | |
449 | |
450 // Compute whether the root vframe returns a float or double value. | |
451 BasicType return_type; | |
452 { | |
453 HandleMark hm; | |
454 methodHandle method(thread, array->element(0)->method()); | |
2142 | 455 Bytecode_invoke invoke = Bytecode_invoke_check(method, array->element(0)->bci()); |
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456 return_type = invoke.is_valid() ? invoke.result_type() : T_ILLEGAL; |
0 | 457 } |
458 | |
459 // Compute information for handling adapters and adjusting the frame size of the caller. | |
460 int caller_adjustment = 0; | |
461 | |
462 // Compute the amount the oldest interpreter frame will have to adjust | |
463 // its caller's stack by. If the caller is a compiled frame then | |
464 // we pretend that the callee has no parameters so that the | |
465 // extension counts for the full amount of locals and not just | |
466 // locals-parms. This is because without a c2i adapter the parm | |
467 // area as created by the compiled frame will not be usable by | |
468 // the interpreter. (Depending on the calling convention there | |
469 // may not even be enough space). | |
470 | |
471 // QQQ I'd rather see this pushed down into last_frame_adjust | |
472 // and have it take the sender (aka caller). | |
473 | |
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474 if (deopt_sender.is_compiled_frame() || caller_was_method_handle) { |
0 | 475 caller_adjustment = last_frame_adjust(0, callee_locals); |
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476 } else if (callee_locals > callee_parameters) { |
0 | 477 // The caller frame may need extending to accommodate |
478 // non-parameter locals of the first unpacked interpreted frame. | |
479 // Compute that adjustment. | |
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480 caller_adjustment = last_frame_adjust(callee_parameters, callee_locals); |
0 | 481 } |
482 | |
483 // If the sender is deoptimized the we must retrieve the address of the handler | |
484 // since the frame will "magically" show the original pc before the deopt | |
485 // and we'd undo the deopt. | |
486 | |
487 frame_pcs[0] = deopt_sender.raw_pc(); | |
488 | |
1692 | 489 #ifndef SHARK |
0 | 490 assert(CodeCache::find_blob_unsafe(frame_pcs[0]) != NULL, "bad pc"); |
1692 | 491 #endif // SHARK |
0 | 492 |
493 UnrollBlock* info = new UnrollBlock(array->frame_size() * BytesPerWord, | |
494 caller_adjustment * BytesPerWord, | |
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495 caller_was_method_handle ? 0 : callee_parameters, |
0 | 496 number_of_frames, |
497 frame_sizes, | |
498 frame_pcs, | |
499 return_type); | |
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500 // On some platforms, we need a way to pass some platform dependent |
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501 // information to the unpacking code so the skeletal frames come out |
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502 // correct (initial fp value, unextended sp, ...) |
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503 info->set_initial_info((intptr_t) array->sender().initial_deoptimization_info()); |
0 | 504 |
505 if (array->frames() > 1) { | |
506 if (VerifyStack && TraceDeoptimization) { | |
6843 | 507 ttyLocker ttyl; |
0 | 508 tty->print_cr("Deoptimizing method containing inlining"); |
509 } | |
510 } | |
511 | |
512 array->set_unroll_block(info); | |
513 return info; | |
514 } | |
515 | |
516 // Called to cleanup deoptimization data structures in normal case | |
517 // after unpacking to stack and when stack overflow error occurs | |
518 void Deoptimization::cleanup_deopt_info(JavaThread *thread, | |
519 vframeArray *array) { | |
520 | |
521 // Get array if coming from exception | |
522 if (array == NULL) { | |
523 array = thread->vframe_array_head(); | |
524 } | |
525 thread->set_vframe_array_head(NULL); | |
526 | |
527 // Free the previous UnrollBlock | |
528 vframeArray* old_array = thread->vframe_array_last(); | |
529 thread->set_vframe_array_last(array); | |
530 | |
531 if (old_array != NULL) { | |
532 UnrollBlock* old_info = old_array->unroll_block(); | |
533 old_array->set_unroll_block(NULL); | |
534 delete old_info; | |
535 delete old_array; | |
536 } | |
537 | |
538 // Deallocate any resource creating in this routine and any ResourceObjs allocated | |
539 // inside the vframeArray (StackValueCollections) | |
540 | |
541 delete thread->deopt_mark(); | |
542 thread->set_deopt_mark(NULL); | |
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543 thread->set_deopt_nmethod(NULL); |
0 | 544 |
545 | |
546 if (JvmtiExport::can_pop_frame()) { | |
547 #ifndef CC_INTERP | |
548 // Regardless of whether we entered this routine with the pending | |
549 // popframe condition bit set, we should always clear it now | |
550 thread->clear_popframe_condition(); | |
551 #else | |
552 // C++ interpeter will clear has_pending_popframe when it enters | |
553 // with method_resume. For deopt_resume2 we clear it now. | |
554 if (thread->popframe_forcing_deopt_reexecution()) | |
555 thread->clear_popframe_condition(); | |
556 #endif /* CC_INTERP */ | |
557 } | |
558 | |
559 // unpack_frames() is called at the end of the deoptimization handler | |
560 // and (in C2) at the end of the uncommon trap handler. Note this fact | |
561 // so that an asynchronous stack walker can work again. This counter is | |
562 // incremented at the beginning of fetch_unroll_info() and (in C2) at | |
563 // the beginning of uncommon_trap(). | |
564 thread->dec_in_deopt_handler(); | |
565 } | |
566 | |
567 | |
568 // Return BasicType of value being returned | |
569 JRT_LEAF(BasicType, Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)) | |
570 | |
571 // We are already active int he special DeoptResourceMark any ResourceObj's we | |
572 // allocate will be freed at the end of the routine. | |
573 | |
574 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
575 // but makes the entry a little slower. There is however a little dance we have to | |
576 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
577 ResetNoHandleMark rnhm; // No-op in release/product versions | |
578 HandleMark hm; | |
579 | |
580 frame stub_frame = thread->last_frame(); | |
581 | |
582 // Since the frame to unpack is the top frame of this thread, the vframe_array_head | |
583 // must point to the vframeArray for the unpack frame. | |
584 vframeArray* array = thread->vframe_array_head(); | |
585 | |
586 #ifndef PRODUCT | |
587 if (TraceDeoptimization) { | |
6843 | 588 ttyLocker ttyl; |
0 | 589 tty->print_cr("DEOPT UNPACKING thread " INTPTR_FORMAT " vframeArray " INTPTR_FORMAT " mode %d", thread, array, exec_mode); |
590 } | |
591 #endif | |
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592 Events::log(thread, "DEOPT UNPACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT " mode %d", |
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593 stub_frame.pc(), stub_frame.sp(), exec_mode); |
0 | 594 |
595 UnrollBlock* info = array->unroll_block(); | |
596 | |
597 // Unpack the interpreter frames and any adapter frame (c2 only) we might create. | |
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598 array->unpack_to_stack(stub_frame, exec_mode, info->caller_actual_parameters()); |
0 | 599 |
600 BasicType bt = info->return_type(); | |
601 | |
602 // If we have an exception pending, claim that the return type is an oop | |
603 // so the deopt_blob does not overwrite the exception_oop. | |
604 | |
605 if (exec_mode == Unpack_exception) | |
606 bt = T_OBJECT; | |
607 | |
608 // Cleanup thread deopt data | |
609 cleanup_deopt_info(thread, array); | |
610 | |
611 #ifndef PRODUCT | |
612 if (VerifyStack) { | |
613 ResourceMark res_mark; | |
614 | |
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615 thread->validate_frame_layout(); |
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616 |
0 | 617 // Verify that the just-unpacked frames match the interpreter's |
618 // notions of expression stack and locals | |
619 vframeArray* cur_array = thread->vframe_array_last(); | |
620 RegisterMap rm(thread, false); | |
621 rm.set_include_argument_oops(false); | |
622 bool is_top_frame = true; | |
623 int callee_size_of_parameters = 0; | |
624 int callee_max_locals = 0; | |
625 for (int i = 0; i < cur_array->frames(); i++) { | |
626 vframeArrayElement* el = cur_array->element(i); | |
627 frame* iframe = el->iframe(); | |
628 guarantee(iframe->is_interpreted_frame(), "Wrong frame type"); | |
629 | |
630 // Get the oop map for this bci | |
631 InterpreterOopMap mask; | |
632 int cur_invoke_parameter_size = 0; | |
633 bool try_next_mask = false; | |
634 int next_mask_expression_stack_size = -1; | |
635 int top_frame_expression_stack_adjustment = 0; | |
636 methodHandle mh(thread, iframe->interpreter_frame_method()); | |
637 OopMapCache::compute_one_oop_map(mh, iframe->interpreter_frame_bci(), &mask); | |
638 BytecodeStream str(mh); | |
639 str.set_start(iframe->interpreter_frame_bci()); | |
640 int max_bci = mh->code_size(); | |
641 // Get to the next bytecode if possible | |
642 assert(str.bci() < max_bci, "bci in interpreter frame out of bounds"); | |
643 // Check to see if we can grab the number of outgoing arguments | |
644 // at an uncommon trap for an invoke (where the compiler | |
645 // generates debug info before the invoke has executed) | |
646 Bytecodes::Code cur_code = str.next(); | |
10390 | 647 if (cur_code == Bytecodes::_invokevirtual || |
648 cur_code == Bytecodes::_invokespecial || | |
649 cur_code == Bytecodes::_invokestatic || | |
650 cur_code == Bytecodes::_invokeinterface || | |
651 cur_code == Bytecodes::_invokedynamic) { | |
2142 | 652 Bytecode_invoke invoke(mh, iframe->interpreter_frame_bci()); |
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653 Symbol* signature = invoke.signature(); |
0 | 654 ArgumentSizeComputer asc(signature); |
655 cur_invoke_parameter_size = asc.size(); | |
10390 | 656 if (invoke.has_receiver()) { |
0 | 657 // Add in receiver |
658 ++cur_invoke_parameter_size; | |
659 } | |
10390 | 660 if (i != 0 && !invoke.is_invokedynamic() && MethodHandles::has_member_arg(invoke.klass(), invoke.name())) { |
661 callee_size_of_parameters++; | |
662 } | |
0 | 663 } |
664 if (str.bci() < max_bci) { | |
665 Bytecodes::Code bc = str.next(); | |
666 if (bc >= 0) { | |
667 // The interpreter oop map generator reports results before | |
668 // the current bytecode has executed except in the case of | |
669 // calls. It seems to be hard to tell whether the compiler | |
670 // has emitted debug information matching the "state before" | |
671 // a given bytecode or the state after, so we try both | |
672 switch (cur_code) { | |
673 case Bytecodes::_invokevirtual: | |
674 case Bytecodes::_invokespecial: | |
675 case Bytecodes::_invokestatic: | |
676 case Bytecodes::_invokeinterface: | |
10390 | 677 case Bytecodes::_invokedynamic: |
0 | 678 case Bytecodes::_athrow: |
679 break; | |
680 default: { | |
681 InterpreterOopMap next_mask; | |
682 OopMapCache::compute_one_oop_map(mh, str.bci(), &next_mask); | |
683 next_mask_expression_stack_size = next_mask.expression_stack_size(); | |
684 // Need to subtract off the size of the result type of | |
685 // the bytecode because this is not described in the | |
686 // debug info but returned to the interpreter in the TOS | |
687 // caching register | |
688 BasicType bytecode_result_type = Bytecodes::result_type(cur_code); | |
689 if (bytecode_result_type != T_ILLEGAL) { | |
690 top_frame_expression_stack_adjustment = type2size[bytecode_result_type]; | |
691 } | |
692 assert(top_frame_expression_stack_adjustment >= 0, ""); | |
693 try_next_mask = true; | |
694 break; | |
695 } | |
696 } | |
697 } | |
698 } | |
699 | |
700 // Verify stack depth and oops in frame | |
701 // This assertion may be dependent on the platform we're running on and may need modification (tested on x86 and sparc) | |
702 if (!( | |
703 /* SPARC */ | |
704 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_size_of_parameters) || | |
705 /* x86 */ | |
706 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_max_locals) || | |
707 (try_next_mask && | |
708 (iframe->interpreter_frame_expression_stack_size() == (next_mask_expression_stack_size - | |
709 top_frame_expression_stack_adjustment))) || | |
710 (is_top_frame && (exec_mode == Unpack_exception) && iframe->interpreter_frame_expression_stack_size() == 0) || | |
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711 (is_top_frame && (exec_mode == Unpack_uncommon_trap || exec_mode == Unpack_reexecute || el->should_reexecute()) && |
0 | 712 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + cur_invoke_parameter_size)) |
713 )) { | |
714 ttyLocker ttyl; | |
715 | |
716 // Print out some information that will help us debug the problem | |
717 tty->print_cr("Wrong number of expression stack elements during deoptimization"); | |
718 tty->print_cr(" Error occurred while verifying frame %d (0..%d, 0 is topmost)", i, cur_array->frames() - 1); | |
719 tty->print_cr(" Fabricated interpreter frame had %d expression stack elements", | |
720 iframe->interpreter_frame_expression_stack_size()); | |
721 tty->print_cr(" Interpreter oop map had %d expression stack elements", mask.expression_stack_size()); | |
722 tty->print_cr(" try_next_mask = %d", try_next_mask); | |
723 tty->print_cr(" next_mask_expression_stack_size = %d", next_mask_expression_stack_size); | |
724 tty->print_cr(" callee_size_of_parameters = %d", callee_size_of_parameters); | |
725 tty->print_cr(" callee_max_locals = %d", callee_max_locals); | |
726 tty->print_cr(" top_frame_expression_stack_adjustment = %d", top_frame_expression_stack_adjustment); | |
727 tty->print_cr(" exec_mode = %d", exec_mode); | |
728 tty->print_cr(" cur_invoke_parameter_size = %d", cur_invoke_parameter_size); | |
729 tty->print_cr(" Thread = " INTPTR_FORMAT ", thread ID = " UINTX_FORMAT, thread, thread->osthread()->thread_id()); | |
730 tty->print_cr(" Interpreted frames:"); | |
731 for (int k = 0; k < cur_array->frames(); k++) { | |
732 vframeArrayElement* el = cur_array->element(k); | |
733 tty->print_cr(" %s (bci %d)", el->method()->name_and_sig_as_C_string(), el->bci()); | |
734 } | |
735 cur_array->print_on_2(tty); | |
736 guarantee(false, "wrong number of expression stack elements during deopt"); | |
737 } | |
738 VerifyOopClosure verify; | |
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739 iframe->oops_interpreted_do(&verify, NULL, &rm, false); |
0 | 740 callee_size_of_parameters = mh->size_of_parameters(); |
741 callee_max_locals = mh->max_locals(); | |
742 is_top_frame = false; | |
743 } | |
744 } | |
745 #endif /* !PRODUCT */ | |
746 | |
747 | |
748 return bt; | |
749 JRT_END | |
750 | |
751 | |
752 int Deoptimization::deoptimize_dependents() { | |
753 Threads::deoptimized_wrt_marked_nmethods(); | |
754 return 0; | |
755 } | |
756 | |
757 | |
758 #ifdef COMPILER2 | |
759 bool Deoptimization::realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS) { | |
760 Handle pending_exception(thread->pending_exception()); | |
761 const char* exception_file = thread->exception_file(); | |
762 int exception_line = thread->exception_line(); | |
763 thread->clear_pending_exception(); | |
764 | |
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765 bool failures = false; |
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766 |
0 | 767 for (int i = 0; i < objects->length(); i++) { |
768 assert(objects->at(i)->is_object(), "invalid debug information"); | |
769 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
770 | |
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771 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 772 oop obj = NULL; |
773 | |
774 if (k->oop_is_instance()) { | |
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775 InstanceKlass* ik = InstanceKlass::cast(k()); |
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776 obj = ik->allocate_instance(THREAD); |
0 | 777 } else if (k->oop_is_typeArray()) { |
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778 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
0 | 779 assert(sv->field_size() % type2size[ak->element_type()] == 0, "non-integral array length"); |
780 int len = sv->field_size() / type2size[ak->element_type()]; | |
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781 obj = ak->allocate(len, THREAD); |
0 | 782 } else if (k->oop_is_objArray()) { |
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783 ObjArrayKlass* ak = ObjArrayKlass::cast(k()); |
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784 obj = ak->allocate(sv->field_size(), THREAD); |
0 | 785 } |
786 | |
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787 if (obj == NULL) { |
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788 failures = true; |
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789 } |
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790 |
0 | 791 assert(sv->value().is_null(), "redundant reallocation"); |
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792 assert(obj != NULL || HAS_PENDING_EXCEPTION, "allocation should succeed or we should get an exception"); |
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793 CLEAR_PENDING_EXCEPTION; |
0 | 794 sv->set_value(obj); |
795 } | |
796 | |
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797 if (failures) { |
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798 THROW_OOP_(Universe::out_of_memory_error_realloc_objects(), failures); |
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799 } else if (pending_exception.not_null()) { |
0 | 800 thread->set_pending_exception(pending_exception(), exception_file, exception_line); |
801 } | |
802 | |
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803 return failures; |
0 | 804 } |
805 | |
806 // This assumes that the fields are stored in ObjectValue in the same order | |
807 // they are yielded by do_nonstatic_fields. | |
808 class FieldReassigner: public FieldClosure { | |
809 frame* _fr; | |
810 RegisterMap* _reg_map; | |
811 ObjectValue* _sv; | |
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812 InstanceKlass* _ik; |
0 | 813 oop _obj; |
814 | |
815 int _i; | |
816 public: | |
817 FieldReassigner(frame* fr, RegisterMap* reg_map, ObjectValue* sv, oop obj) : | |
818 _fr(fr), _reg_map(reg_map), _sv(sv), _obj(obj), _i(0) {} | |
819 | |
820 int i() const { return _i; } | |
821 | |
822 | |
823 void do_field(fieldDescriptor* fd) { | |
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824 intptr_t val; |
0 | 825 StackValue* value = |
826 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(i())); | |
827 int offset = fd->offset(); | |
828 switch (fd->field_type()) { | |
829 case T_OBJECT: case T_ARRAY: | |
830 assert(value->type() == T_OBJECT, "Agreement."); | |
831 _obj->obj_field_put(offset, value->get_obj()()); | |
832 break; | |
833 | |
834 case T_LONG: case T_DOUBLE: { | |
835 assert(value->type() == T_INT, "Agreement."); | |
836 StackValue* low = | |
837 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(++_i)); | |
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838 #ifdef _LP64 |
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839 jlong res = (jlong)low->get_int(); |
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840 #else |
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841 #ifdef SPARC |
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842 // For SPARC we have to swap high and low words. |
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843 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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844 #else |
0 | 845 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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846 #endif //SPARC |
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847 #endif |
0 | 848 _obj->long_field_put(offset, res); |
849 break; | |
850 } | |
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851 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
0 | 852 case T_INT: case T_FLOAT: // 4 bytes. |
853 assert(value->type() == T_INT, "Agreement."); | |
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854 val = value->get_int(); |
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855 _obj->int_field_put(offset, (jint)*((jint*)&val)); |
0 | 856 break; |
857 | |
858 case T_SHORT: case T_CHAR: // 2 bytes | |
859 assert(value->type() == T_INT, "Agreement."); | |
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860 val = value->get_int(); |
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861 _obj->short_field_put(offset, (jshort)*((jint*)&val)); |
0 | 862 break; |
863 | |
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864 case T_BOOLEAN: case T_BYTE: // 1 byte |
0 | 865 assert(value->type() == T_INT, "Agreement."); |
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866 val = value->get_int(); |
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867 _obj->bool_field_put(offset, (jboolean)*((jint*)&val)); |
0 | 868 break; |
869 | |
870 default: | |
871 ShouldNotReachHere(); | |
872 } | |
873 _i++; | |
874 } | |
875 }; | |
876 | |
877 // restore elements of an eliminated type array | |
878 void Deoptimization::reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type) { | |
879 int index = 0; | |
44
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880 intptr_t val; |
0 | 881 |
882 for (int i = 0; i < sv->field_size(); i++) { | |
883 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
884 switch(type) { | |
44
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885 case T_LONG: case T_DOUBLE: { |
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886 assert(value->type() == T_INT, "Agreement."); |
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887 StackValue* low = |
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888 StackValue::create_stack_value(fr, reg_map, sv->field_at(++i)); |
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889 #ifdef _LP64 |
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890 jlong res = (jlong)low->get_int(); |
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891 #else |
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892 #ifdef SPARC |
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893 // For SPARC we have to swap high and low words. |
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894 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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895 #else |
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896 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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897 #endif //SPARC |
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898 #endif |
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899 obj->long_at_put(index, res); |
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900 break; |
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901 } |
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902 |
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903 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
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904 case T_INT: case T_FLOAT: // 4 bytes. |
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905 assert(value->type() == T_INT, "Agreement."); |
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906 val = value->get_int(); |
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907 obj->int_at_put(index, (jint)*((jint*)&val)); |
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908 break; |
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909 |
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910 case T_SHORT: case T_CHAR: // 2 bytes |
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911 assert(value->type() == T_INT, "Agreement."); |
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912 val = value->get_int(); |
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913 obj->short_at_put(index, (jshort)*((jint*)&val)); |
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914 break; |
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915 |
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916 case T_BOOLEAN: case T_BYTE: // 1 byte |
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917 assert(value->type() == T_INT, "Agreement."); |
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918 val = value->get_int(); |
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919 obj->bool_at_put(index, (jboolean)*((jint*)&val)); |
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920 break; |
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921 |
0 | 922 default: |
923 ShouldNotReachHere(); | |
924 } | |
925 index++; | |
926 } | |
927 } | |
928 | |
929 | |
930 // restore fields of an eliminated object array | |
931 void Deoptimization::reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj) { | |
932 for (int i = 0; i < sv->field_size(); i++) { | |
933 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
934 assert(value->type() == T_OBJECT, "object element expected"); | |
935 obj->obj_at_put(i, value->get_obj()()); | |
936 } | |
937 } | |
938 | |
939 | |
940 // restore fields of all eliminated objects and arrays | |
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941 void Deoptimization::reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects, bool realloc_failures) { |
0 | 942 for (int i = 0; i < objects->length(); i++) { |
943 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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944 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 945 Handle obj = sv->value(); |
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946 assert(obj.not_null() || realloc_failures, "reallocation was missed"); |
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947 if (obj.is_null()) { |
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948 continue; |
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949 } |
0 | 950 |
951 if (k->oop_is_instance()) { | |
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952 InstanceKlass* ik = InstanceKlass::cast(k()); |
0 | 953 FieldReassigner reassign(fr, reg_map, sv, obj()); |
954 ik->do_nonstatic_fields(&reassign); | |
955 } else if (k->oop_is_typeArray()) { | |
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956 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
0 | 957 reassign_type_array_elements(fr, reg_map, sv, (typeArrayOop) obj(), ak->element_type()); |
958 } else if (k->oop_is_objArray()) { | |
959 reassign_object_array_elements(fr, reg_map, sv, (objArrayOop) obj()); | |
960 } | |
961 } | |
962 } | |
963 | |
964 | |
965 // relock objects for which synchronization was eliminated | |
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966 void Deoptimization::relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread, bool realloc_failures) { |
0 | 967 for (int i = 0; i < monitors->length(); i++) { |
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968 MonitorInfo* mon_info = monitors->at(i); |
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969 if (mon_info->eliminated()) { |
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970 assert(!mon_info->owner_is_scalar_replaced() || realloc_failures, "reallocation was missed"); |
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971 if (!mon_info->owner_is_scalar_replaced()) { |
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972 Handle obj = Handle(mon_info->owner()); |
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973 markOop mark = obj->mark(); |
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974 if (UseBiasedLocking && mark->has_bias_pattern()) { |
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975 // New allocated objects may have the mark set to anonymously biased. |
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976 // Also the deoptimized method may called methods with synchronization |
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977 // where the thread-local object is bias locked to the current thread. |
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978 assert(mark->is_biased_anonymously() || |
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979 mark->biased_locker() == thread, "should be locked to current thread"); |
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980 // Reset mark word to unbiased prototype. |
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981 markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
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982 obj->set_mark(unbiased_prototype); |
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983 } |
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984 BasicLock* lock = mon_info->lock(); |
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985 ObjectSynchronizer::slow_enter(obj, lock, thread); |
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986 assert(mon_info->owner()->is_locked(), "object must be locked now"); |
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987 } |
0 | 988 } |
989 } | |
990 } | |
991 | |
992 | |
993 #ifndef PRODUCT | |
994 // print information about reallocated objects | |
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995 void Deoptimization::print_objects(GrowableArray<ScopeValue*>* objects, bool realloc_failures) { |
0 | 996 fieldDescriptor fd; |
997 | |
998 for (int i = 0; i < objects->length(); i++) { | |
999 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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1000 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 1001 Handle obj = sv->value(); |
1002 | |
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1003 tty->print(" object <" INTPTR_FORMAT "> of type ", (void *)sv->value()()); |
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1004 k->print_value(); |
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1005 assert(obj.not_null() || realloc_failures, "reallocation was missed"); |
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1006 if (obj.is_null()) { |
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1007 tty->print(" allocation failed"); |
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1008 } else { |
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1009 tty->print(" allocated (%d bytes)", obj->size() * HeapWordSize); |
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1010 } |
0 | 1011 tty->cr(); |
1012 | |
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1013 if (Verbose && !obj.is_null()) { |
0 | 1014 k->oop_print_on(obj(), tty); |
1015 } | |
1016 } | |
1017 } | |
1018 #endif | |
1019 #endif // COMPILER2 | |
1020 | |
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1021 vframeArray* Deoptimization::create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk, bool realloc_failures) { |
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1022 Events::log(thread, "DEOPT PACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT, fr.pc(), fr.sp()); |
0 | 1023 |
1024 #ifndef PRODUCT | |
1025 if (TraceDeoptimization) { | |
1026 ttyLocker ttyl; | |
1027 tty->print("DEOPT PACKING thread " INTPTR_FORMAT " ", thread); | |
1028 fr.print_on(tty); | |
1029 tty->print_cr(" Virtual frames (innermost first):"); | |
1030 for (int index = 0; index < chunk->length(); index++) { | |
1031 compiledVFrame* vf = chunk->at(index); | |
1032 tty->print(" %2d - ", index); | |
1033 vf->print_value(); | |
1034 int bci = chunk->at(index)->raw_bci(); | |
1035 const char* code_name; | |
1036 if (bci == SynchronizationEntryBCI) { | |
1037 code_name = "sync entry"; | |
1038 } else { | |
2142 | 1039 Bytecodes::Code code = vf->method()->code_at(bci); |
0 | 1040 code_name = Bytecodes::name(code); |
1041 } | |
1042 tty->print(" - %s", code_name); | |
1043 tty->print_cr(" @ bci %d ", bci); | |
1044 if (Verbose) { | |
1045 vf->print(); | |
1046 tty->cr(); | |
1047 } | |
1048 } | |
1049 } | |
1050 #endif | |
1051 | |
1052 // Register map for next frame (used for stack crawl). We capture | |
1053 // the state of the deopt'ing frame's caller. Thus if we need to | |
1054 // stuff a C2I adapter we can properly fill in the callee-save | |
1055 // register locations. | |
1056 frame caller = fr.sender(reg_map); | |
1057 int frame_size = caller.sp() - fr.sp(); | |
1058 | |
1059 frame sender = caller; | |
1060 | |
1061 // Since the Java thread being deoptimized will eventually adjust it's own stack, | |
1062 // the vframeArray containing the unpacking information is allocated in the C heap. | |
1063 // For Compiler1, the caller of the deoptimized frame is saved for use by unpack_frames(). | |
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1064 vframeArray* array = vframeArray::allocate(thread, frame_size, chunk, reg_map, sender, caller, fr, realloc_failures); |
0 | 1065 |
1066 // Compare the vframeArray to the collected vframes | |
1067 assert(array->structural_compare(thread, chunk), "just checking"); | |
1068 | |
1069 #ifndef PRODUCT | |
1070 if (TraceDeoptimization) { | |
1071 ttyLocker ttyl; | |
1072 tty->print_cr(" Created vframeArray " INTPTR_FORMAT, array); | |
1073 } | |
1074 #endif // PRODUCT | |
1075 | |
1076 return array; | |
1077 } | |
1078 | |
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1079 #ifdef COMPILER2 |
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1080 void Deoptimization::pop_frames_failed_reallocs(JavaThread* thread, vframeArray* array) { |
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1081 // Reallocation of some scalar replaced objects failed. Record |
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1082 // that we need to pop all the interpreter frames for the |
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1083 // deoptimized compiled frame. |
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1084 assert(thread->frames_to_pop_failed_realloc() == 0, "missed frames to pop?"); |
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1085 thread->set_frames_to_pop_failed_realloc(array->frames()); |
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1086 // Unlock all monitors here otherwise the interpreter will see a |
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1087 // mix of locked and unlocked monitors (because of failed |
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1088 // reallocations of synchronized objects) and be confused. |
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1089 for (int i = 0; i < array->frames(); i++) { |
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1090 MonitorChunk* monitors = array->element(i)->monitors(); |
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1091 if (monitors != NULL) { |
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1092 for (int j = 0; j < monitors->number_of_monitors(); j++) { |
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1093 BasicObjectLock* src = monitors->at(j); |
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1094 if (src->obj() != NULL) { |
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1095 ObjectSynchronizer::fast_exit(src->obj(), src->lock(), thread); |
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1096 } |
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1097 } |
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1098 array->element(i)->free_monitors(thread); |
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1099 #ifdef ASSERT |
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1100 array->element(i)->set_removed_monitors(); |
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1101 #endif |
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1102 } |
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1103 } |
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1104 } |
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1105 #endif |
0 | 1106 |
1107 static void collect_monitors(compiledVFrame* cvf, GrowableArray<Handle>* objects_to_revoke) { | |
1108 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); | |
1109 for (int i = 0; i < monitors->length(); i++) { | |
1110 MonitorInfo* mon_info = monitors->at(i); | |
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1111 if (!mon_info->eliminated() && mon_info->owner() != NULL) { |
0 | 1112 objects_to_revoke->append(Handle(mon_info->owner())); |
1113 } | |
1114 } | |
1115 } | |
1116 | |
1117 | |
1118 void Deoptimization::revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map) { | |
1119 if (!UseBiasedLocking) { | |
1120 return; | |
1121 } | |
1122 | |
1123 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
1124 | |
1125 // Unfortunately we don't have a RegisterMap available in most of | |
1126 // the places we want to call this routine so we need to walk the | |
1127 // stack again to update the register map. | |
1128 if (map == NULL || !map->update_map()) { | |
1129 StackFrameStream sfs(thread, true); | |
1130 bool found = false; | |
1131 while (!found && !sfs.is_done()) { | |
1132 frame* cur = sfs.current(); | |
1133 sfs.next(); | |
1134 found = cur->id() == fr.id(); | |
1135 } | |
1136 assert(found, "frame to be deoptimized not found on target thread's stack"); | |
1137 map = sfs.register_map(); | |
1138 } | |
1139 | |
1140 vframe* vf = vframe::new_vframe(&fr, map, thread); | |
1141 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1142 // Revoke monitors' biases in all scopes | |
1143 while (!cvf->is_top()) { | |
1144 collect_monitors(cvf, objects_to_revoke); | |
1145 cvf = compiledVFrame::cast(cvf->sender()); | |
1146 } | |
1147 collect_monitors(cvf, objects_to_revoke); | |
1148 | |
1149 if (SafepointSynchronize::is_at_safepoint()) { | |
1150 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
1151 } else { | |
1152 BiasedLocking::revoke(objects_to_revoke); | |
1153 } | |
1154 } | |
1155 | |
1156 | |
1157 void Deoptimization::revoke_biases_of_monitors(CodeBlob* cb) { | |
1158 if (!UseBiasedLocking) { | |
1159 return; | |
1160 } | |
1161 | |
1162 assert(SafepointSynchronize::is_at_safepoint(), "must only be called from safepoint"); | |
1163 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
1164 for (JavaThread* jt = Threads::first(); jt != NULL ; jt = jt->next()) { | |
1165 if (jt->has_last_Java_frame()) { | |
1166 StackFrameStream sfs(jt, true); | |
1167 while (!sfs.is_done()) { | |
1168 frame* cur = sfs.current(); | |
1169 if (cb->contains(cur->pc())) { | |
1170 vframe* vf = vframe::new_vframe(cur, sfs.register_map(), jt); | |
1171 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1172 // Revoke monitors' biases in all scopes | |
1173 while (!cvf->is_top()) { | |
1174 collect_monitors(cvf, objects_to_revoke); | |
1175 cvf = compiledVFrame::cast(cvf->sender()); | |
1176 } | |
1177 collect_monitors(cvf, objects_to_revoke); | |
1178 } | |
1179 sfs.next(); | |
1180 } | |
1181 } | |
1182 } | |
1183 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
1184 } | |
1185 | |
1186 | |
1187 void Deoptimization::deoptimize_single_frame(JavaThread* thread, frame fr) { | |
1188 assert(fr.can_be_deoptimized(), "checking frame type"); | |
1189 | |
1190 gather_statistics(Reason_constraint, Action_none, Bytecodes::_illegal); | |
1191 | |
1192 // Patch the nmethod so that when execution returns to it we will | |
1193 // deopt the execution state and return to the interpreter. | |
1194 fr.deoptimize(thread); | |
1195 } | |
1196 | |
1197 void Deoptimization::deoptimize(JavaThread* thread, frame fr, RegisterMap *map) { | |
1198 // Deoptimize only if the frame comes from compile code. | |
1199 // Do not deoptimize the frame which is already patched | |
1200 // during the execution of the loops below. | |
1201 if (!fr.is_compiled_frame() || fr.is_deoptimized_frame()) { | |
1202 return; | |
1203 } | |
1204 ResourceMark rm; | |
1205 DeoptimizationMarker dm; | |
1206 if (UseBiasedLocking) { | |
1207 revoke_biases_of_monitors(thread, fr, map); | |
1208 } | |
1209 deoptimize_single_frame(thread, fr); | |
1210 | |
1211 } | |
1212 | |
1213 | |
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1214 void Deoptimization::deoptimize_frame_internal(JavaThread* thread, intptr_t* id) { |
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1215 assert(thread == Thread::current() || SafepointSynchronize::is_at_safepoint(), |
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1216 "can only deoptimize other thread at a safepoint"); |
0 | 1217 // Compute frame and register map based on thread and sp. |
1218 RegisterMap reg_map(thread, UseBiasedLocking); | |
1219 frame fr = thread->last_frame(); | |
1220 while (fr.id() != id) { | |
1221 fr = fr.sender(®_map); | |
1222 } | |
1223 deoptimize(thread, fr, ®_map); | |
1224 } | |
1225 | |
1226 | |
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1227 void Deoptimization::deoptimize_frame(JavaThread* thread, intptr_t* id) { |
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1228 if (thread == Thread::current()) { |
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1229 Deoptimization::deoptimize_frame_internal(thread, id); |
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1230 } else { |
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1231 VM_DeoptimizeFrame deopt(thread, id); |
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1232 VMThread::execute(&deopt); |
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1233 } |
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1234 } |
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1235 |
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1236 |
0 | 1237 // JVMTI PopFrame support |
1238 JRT_LEAF(void, Deoptimization::popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address)) | |
1239 { | |
1240 thread->popframe_preserve_args(in_ByteSize(bytes_to_save), start_address); | |
1241 } | |
1242 JRT_END | |
1243 | |
1244 | |
1692 | 1245 #if defined(COMPILER2) || defined(SHARK) |
0 | 1246 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS) { |
1247 // in case of an unresolved klass entry, load the class. | |
1248 if (constant_pool->tag_at(index).is_unresolved_klass()) { | |
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1249 Klass* tk = constant_pool->klass_at(index, CHECK); |
0 | 1250 return; |
1251 } | |
1252 | |
1253 if (!constant_pool->tag_at(index).is_symbol()) return; | |
1254 | |
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1255 Handle class_loader (THREAD, constant_pool->pool_holder()->class_loader()); |
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1256 Symbol* symbol = constant_pool->symbol_at(index); |
0 | 1257 |
1258 // class name? | |
1259 if (symbol->byte_at(0) != '(') { | |
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1260 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
0 | 1261 SystemDictionary::resolve_or_null(symbol, class_loader, protection_domain, CHECK); |
1262 return; | |
1263 } | |
1264 | |
1265 // then it must be a signature! | |
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1266 ResourceMark rm(THREAD); |
0 | 1267 for (SignatureStream ss(symbol); !ss.is_done(); ss.next()) { |
1268 if (ss.is_object()) { | |
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1269 Symbol* class_name = ss.as_symbol(CHECK); |
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1270 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
0 | 1271 SystemDictionary::resolve_or_null(class_name, class_loader, protection_domain, CHECK); |
1272 } | |
1273 } | |
1274 } | |
1275 | |
1276 | |
1277 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) { | |
1278 EXCEPTION_MARK; | |
1279 load_class_by_index(constant_pool, index, THREAD); | |
1280 if (HAS_PENDING_EXCEPTION) { | |
1281 // Exception happened during classloading. We ignore the exception here, since it | |
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1282 // is going to be rethrown since the current activation is going to be deoptimized and |
0 | 1283 // the interpreter will re-execute the bytecode. |
1284 CLEAR_PENDING_EXCEPTION; | |
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1285 // Class loading called java code which may have caused a stack |
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1286 // overflow. If the exception was thrown right before the return |
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1287 // to the runtime the stack is no longer guarded. Reguard the |
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1288 // stack otherwise if we return to the uncommon trap blob and the |
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1289 // stack bang causes a stack overflow we crash. |
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1290 assert(THREAD->is_Java_thread(), "only a java thread can be here"); |
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1291 JavaThread* thread = (JavaThread*)THREAD; |
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1292 bool guard_pages_enabled = thread->stack_yellow_zone_enabled(); |
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1293 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); |
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1294 assert(guard_pages_enabled, "stack banging in uncommon trap blob may cause crash"); |
0 | 1295 } |
1296 } | |
1297 | |
1298 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) { | |
1299 HandleMark hm; | |
1300 | |
1301 // uncommon_trap() is called at the beginning of the uncommon trap | |
1302 // handler. Note this fact before we start generating temporary frames | |
1303 // that can confuse an asynchronous stack walker. This counter is | |
1304 // decremented at the end of unpack_frames(). | |
1305 thread->inc_in_deopt_handler(); | |
1306 | |
1307 // We need to update the map if we have biased locking. | |
1308 RegisterMap reg_map(thread, UseBiasedLocking); | |
1309 frame stub_frame = thread->last_frame(); | |
1310 frame fr = stub_frame.sender(®_map); | |
1311 // Make sure the calling nmethod is not getting deoptimized and removed | |
1312 // before we are done with it. | |
1313 nmethodLocker nl(fr.pc()); | |
1314 | |
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1315 // Log a message |
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1316 Events::log(thread, "Uncommon trap: trap_request=" PTR32_FORMAT " fr.pc=" INTPTR_FORMAT, |
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1317 trap_request, fr.pc()); |
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1318 |
0 | 1319 { |
1320 ResourceMark rm; | |
1321 | |
1322 // Revoke biases of any monitors in the frame to ensure we can migrate them | |
1323 revoke_biases_of_monitors(thread, fr, ®_map); | |
1324 | |
1325 DeoptReason reason = trap_request_reason(trap_request); | |
1326 DeoptAction action = trap_request_action(trap_request); | |
1327 jint unloaded_class_index = trap_request_index(trap_request); // CP idx or -1 | |
1328 | |
1329 vframe* vf = vframe::new_vframe(&fr, ®_map, thread); | |
1330 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1331 | |
1332 nmethod* nm = cvf->code(); | |
1333 | |
1334 ScopeDesc* trap_scope = cvf->scope(); | |
1335 methodHandle trap_method = trap_scope->method(); | |
1336 int trap_bci = trap_scope->bci(); | |
2142 | 1337 Bytecodes::Code trap_bc = trap_method->java_code_at(trap_bci); |
0 | 1338 |
1339 // Record this event in the histogram. | |
1340 gather_statistics(reason, action, trap_bc); | |
1341 | |
1342 // Ensure that we can record deopt. history: | |
17780 | 1343 // Need MDO to record RTM code generation state. |
1344 bool create_if_missing = ProfileTraps RTM_OPT_ONLY( || UseRTMLocking ); | |
0 | 1345 |
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1346 MethodData* trap_mdo = |
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1347 get_method_data(thread, trap_method, create_if_missing); |
0 | 1348 |
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1349 // Log a message |
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1350 Events::log_deopt_message(thread, "Uncommon trap: reason=%s action=%s pc=" INTPTR_FORMAT " method=%s @ %d", |
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1351 trap_reason_name(reason), trap_action_name(action), fr.pc(), |
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1352 trap_method->name_and_sig_as_C_string(), trap_bci); |
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1353 |
0 | 1354 // Print a bunch of diagnostics, if requested. |
1355 if (TraceDeoptimization || LogCompilation) { | |
1356 ResourceMark rm; | |
1357 ttyLocker ttyl; | |
1358 char buf[100]; | |
1359 if (xtty != NULL) { | |
1360 xtty->begin_head("uncommon_trap thread='" UINTX_FORMAT"' %s", | |
1361 os::current_thread_id(), | |
1362 format_trap_request(buf, sizeof(buf), trap_request)); | |
1363 nm->log_identity(xtty); | |
1364 } | |
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1365 Symbol* class_name = NULL; |
0 | 1366 bool unresolved = false; |
1367 if (unloaded_class_index >= 0) { | |
1368 constantPoolHandle constants (THREAD, trap_method->constants()); | |
1369 if (constants->tag_at(unloaded_class_index).is_unresolved_klass()) { | |
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1370 class_name = constants->klass_name_at(unloaded_class_index); |
0 | 1371 unresolved = true; |
1372 if (xtty != NULL) | |
1373 xtty->print(" unresolved='1'"); | |
1374 } else if (constants->tag_at(unloaded_class_index).is_symbol()) { | |
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1375 class_name = constants->symbol_at(unloaded_class_index); |
0 | 1376 } |
1377 if (xtty != NULL) | |
1378 xtty->name(class_name); | |
1379 } | |
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1380 if (xtty != NULL && trap_mdo != NULL) { |
0 | 1381 // Dump the relevant MDO state. |
1382 // This is the deopt count for the current reason, any previous | |
1383 // reasons or recompiles seen at this point. | |
1384 int dcnt = trap_mdo->trap_count(reason); | |
1385 if (dcnt != 0) | |
1386 xtty->print(" count='%d'", dcnt); | |
1387 ProfileData* pdata = trap_mdo->bci_to_data(trap_bci); | |
1388 int dos = (pdata == NULL)? 0: pdata->trap_state(); | |
1389 if (dos != 0) { | |
1390 xtty->print(" state='%s'", format_trap_state(buf, sizeof(buf), dos)); | |
1391 if (trap_state_is_recompiled(dos)) { | |
1392 int recnt2 = trap_mdo->overflow_recompile_count(); | |
1393 if (recnt2 != 0) | |
1394 xtty->print(" recompiles2='%d'", recnt2); | |
1395 } | |
1396 } | |
1397 } | |
1398 if (xtty != NULL) { | |
1399 xtty->stamp(); | |
1400 xtty->end_head(); | |
1401 } | |
1402 if (TraceDeoptimization) { // make noise on the tty | |
1403 tty->print("Uncommon trap occurred in"); | |
1404 nm->method()->print_short_name(tty); | |
6843 | 1405 tty->print(" (@" INTPTR_FORMAT ") thread=" UINTX_FORMAT " reason=%s action=%s unloaded_class_index=%d", |
0 | 1406 fr.pc(), |
6843 | 1407 os::current_thread_id(), |
0 | 1408 trap_reason_name(reason), |
1409 trap_action_name(action), | |
1410 unloaded_class_index); | |
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1411 if (class_name != NULL) { |
0 | 1412 tty->print(unresolved ? " unresolved class: " : " symbol: "); |
1413 class_name->print_symbol_on(tty); | |
1414 } | |
1415 tty->cr(); | |
1416 } | |
1417 if (xtty != NULL) { | |
1418 // Log the precise location of the trap. | |
1419 for (ScopeDesc* sd = trap_scope; ; sd = sd->sender()) { | |
1420 xtty->begin_elem("jvms bci='%d'", sd->bci()); | |
1421 xtty->method(sd->method()); | |
1422 xtty->end_elem(); | |
1423 if (sd->is_top()) break; | |
1424 } | |
1425 xtty->tail("uncommon_trap"); | |
1426 } | |
1427 } | |
1428 // (End diagnostic printout.) | |
1429 | |
1430 // Load class if necessary | |
1431 if (unloaded_class_index >= 0) { | |
1432 constantPoolHandle constants(THREAD, trap_method->constants()); | |
1433 load_class_by_index(constants, unloaded_class_index); | |
1434 } | |
1435 | |
1436 // Flush the nmethod if necessary and desirable. | |
1437 // | |
1438 // We need to avoid situations where we are re-flushing the nmethod | |
1439 // because of a hot deoptimization site. Repeated flushes at the same | |
1440 // point need to be detected by the compiler and avoided. If the compiler | |
1441 // cannot avoid them (or has a bug and "refuses" to avoid them), this | |
1442 // module must take measures to avoid an infinite cycle of recompilation | |
1443 // and deoptimization. There are several such measures: | |
1444 // | |
1445 // 1. If a recompilation is ordered a second time at some site X | |
1446 // and for the same reason R, the action is adjusted to 'reinterpret', | |
1447 // to give the interpreter time to exercise the method more thoroughly. | |
1448 // If this happens, the method's overflow_recompile_count is incremented. | |
1449 // | |
1450 // 2. If the compiler fails to reduce the deoptimization rate, then | |
1451 // the method's overflow_recompile_count will begin to exceed the set | |
1452 // limit PerBytecodeRecompilationCutoff. If this happens, the action | |
1453 // is adjusted to 'make_not_compilable', and the method is abandoned | |
1454 // to the interpreter. This is a performance hit for hot methods, | |
1455 // but is better than a disastrous infinite cycle of recompilations. | |
1456 // (Actually, only the method containing the site X is abandoned.) | |
1457 // | |
1458 // 3. In parallel with the previous measures, if the total number of | |
1459 // recompilations of a method exceeds the much larger set limit | |
1460 // PerMethodRecompilationCutoff, the method is abandoned. | |
1461 // This should only happen if the method is very large and has | |
1462 // many "lukewarm" deoptimizations. The code which enforces this | |
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1463 // limit is elsewhere (class nmethod, class Method). |
0 | 1464 // |
1465 // Note that the per-BCI 'is_recompiled' bit gives the compiler one chance | |
1466 // to recompile at each bytecode independently of the per-BCI cutoff. | |
1467 // | |
1468 // The decision to update code is up to the compiler, and is encoded | |
1469 // in the Action_xxx code. If the compiler requests Action_none | |
1470 // no trap state is changed, no compiled code is changed, and the | |
1471 // computation suffers along in the interpreter. | |
1472 // | |
1473 // The other action codes specify various tactics for decompilation | |
1474 // and recompilation. Action_maybe_recompile is the loosest, and | |
1475 // allows the compiled code to stay around until enough traps are seen, | |
1476 // and until the compiler gets around to recompiling the trapping method. | |
1477 // | |
1478 // The other actions cause immediate removal of the present code. | |
1479 | |
1480 bool update_trap_state = true; | |
1481 bool make_not_entrant = false; | |
1482 bool make_not_compilable = false; | |
1783 | 1483 bool reprofile = false; |
0 | 1484 switch (action) { |
1485 case Action_none: | |
1486 // Keep the old code. | |
1487 update_trap_state = false; | |
1488 break; | |
1489 case Action_maybe_recompile: | |
1490 // Do not need to invalidate the present code, but we can | |
1491 // initiate another | |
1492 // Start compiler without (necessarily) invalidating the nmethod. | |
1493 // The system will tolerate the old code, but new code should be | |
1494 // generated when possible. | |
1495 break; | |
1496 case Action_reinterpret: | |
1497 // Go back into the interpreter for a while, and then consider | |
1498 // recompiling form scratch. | |
1499 make_not_entrant = true; | |
1500 // Reset invocation counter for outer most method. | |
1501 // This will allow the interpreter to exercise the bytecodes | |
1502 // for a while before recompiling. | |
1503 // By contrast, Action_make_not_entrant is immediate. | |
1504 // | |
1505 // Note that the compiler will track null_check, null_assert, | |
1506 // range_check, and class_check events and log them as if they | |
1507 // had been traps taken from compiled code. This will update | |
1508 // the MDO trap history so that the next compilation will | |
1509 // properly detect hot trap sites. | |
1783 | 1510 reprofile = true; |
0 | 1511 break; |
1512 case Action_make_not_entrant: | |
1513 // Request immediate recompilation, and get rid of the old code. | |
1514 // Make them not entrant, so next time they are called they get | |
1515 // recompiled. Unloaded classes are loaded now so recompile before next | |
1516 // time they are called. Same for uninitialized. The interpreter will | |
1517 // link the missing class, if any. | |
1518 make_not_entrant = true; | |
1519 break; | |
1520 case Action_make_not_compilable: | |
1521 // Give up on compiling this method at all. | |
1522 make_not_entrant = true; | |
1523 make_not_compilable = true; | |
1524 break; | |
1525 default: | |
1526 ShouldNotReachHere(); | |
1527 } | |
1528 | |
1529 // Setting +ProfileTraps fixes the following, on all platforms: | |
1530 // 4852688: ProfileInterpreter is off by default for ia64. The result is | |
1531 // infinite heroic-opt-uncommon-trap/deopt/recompile cycles, since the | |
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1532 // recompile relies on a MethodData* to record heroic opt failures. |
0 | 1533 |
1534 // Whether the interpreter is producing MDO data or not, we also need | |
1535 // to use the MDO to detect hot deoptimization points and control | |
1536 // aggressive optimization. | |
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1537 bool inc_recompile_count = false; |
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1538 ProfileData* pdata = NULL; |
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1539 if (ProfileTraps && update_trap_state && trap_mdo != NULL) { |
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1540 assert(trap_mdo == get_method_data(thread, trap_method, false), "sanity"); |
0 | 1541 uint this_trap_count = 0; |
1542 bool maybe_prior_trap = false; | |
1543 bool maybe_prior_recompile = false; | |
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1544 pdata = query_update_method_data(trap_mdo, trap_bci, reason, |
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1545 nm->method(), |
0 | 1546 //outputs: |
1547 this_trap_count, | |
1548 maybe_prior_trap, | |
1549 maybe_prior_recompile); | |
1550 // Because the interpreter also counts null, div0, range, and class | |
1551 // checks, these traps from compiled code are double-counted. | |
1552 // This is harmless; it just means that the PerXTrapLimit values | |
1553 // are in effect a little smaller than they look. | |
1554 | |
1555 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
1556 if (per_bc_reason != Reason_none) { | |
1557 // Now take action based on the partially known per-BCI history. | |
1558 if (maybe_prior_trap | |
1559 && this_trap_count >= (uint)PerBytecodeTrapLimit) { | |
1560 // If there are too many traps at this BCI, force a recompile. | |
1561 // This will allow the compiler to see the limit overflow, and | |
1562 // take corrective action, if possible. The compiler generally | |
1563 // does not use the exact PerBytecodeTrapLimit value, but instead | |
1564 // changes its tactics if it sees any traps at all. This provides | |
1565 // a little hysteresis, delaying a recompile until a trap happens | |
1566 // several times. | |
1567 // | |
1568 // Actually, since there is only one bit of counter per BCI, | |
1569 // the possible per-BCI counts are {0,1,(per-method count)}. | |
1570 // This produces accurate results if in fact there is only | |
1571 // one hot trap site, but begins to get fuzzy if there are | |
1572 // many sites. For example, if there are ten sites each | |
1573 // trapping two or more times, they each get the blame for | |
1574 // all of their traps. | |
1575 make_not_entrant = true; | |
1576 } | |
1577 | |
1578 // Detect repeated recompilation at the same BCI, and enforce a limit. | |
1579 if (make_not_entrant && maybe_prior_recompile) { | |
1580 // More than one recompile at this point. | |
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1581 inc_recompile_count = maybe_prior_trap; |
0 | 1582 } |
1583 } else { | |
1584 // For reasons which are not recorded per-bytecode, we simply | |
1585 // force recompiles unconditionally. | |
1586 // (Note that PerMethodRecompilationCutoff is enforced elsewhere.) | |
1587 make_not_entrant = true; | |
1588 } | |
1589 | |
1590 // Go back to the compiler if there are too many traps in this method. | |
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1591 if (this_trap_count >= per_method_trap_limit(reason)) { |
0 | 1592 // If there are too many traps in this method, force a recompile. |
1593 // This will allow the compiler to see the limit overflow, and | |
1594 // take corrective action, if possible. | |
1595 // (This condition is an unlikely backstop only, because the | |
1596 // PerBytecodeTrapLimit is more likely to take effect first, | |
1597 // if it is applicable.) | |
1598 make_not_entrant = true; | |
1599 } | |
1600 | |
1601 // Here's more hysteresis: If there has been a recompile at | |
1602 // this trap point already, run the method in the interpreter | |
1603 // for a while to exercise it more thoroughly. | |
1604 if (make_not_entrant && maybe_prior_recompile && maybe_prior_trap) { | |
1783 | 1605 reprofile = true; |
0 | 1606 } |
1607 | |
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1608 } |
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1609 |
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1610 // Take requested actions on the method: |
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1611 |
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1612 // Recompile |
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1613 if (make_not_entrant) { |
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1614 if (!nm->make_not_entrant()) { |
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1615 return; // the call did not change nmethod's state |
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1616 } |
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1617 |
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1618 if (pdata != NULL) { |
0 | 1619 // Record the recompilation event, if any. |
1620 int tstate0 = pdata->trap_state(); | |
1621 int tstate1 = trap_state_set_recompiled(tstate0, true); | |
1622 if (tstate1 != tstate0) | |
1623 pdata->set_trap_state(tstate1); | |
1624 } | |
17780 | 1625 |
1626 #if INCLUDE_RTM_OPT | |
1627 // Restart collecting RTM locking abort statistic if the method | |
1628 // is recompiled for a reason other than RTM state change. | |
1629 // Assume that in new recompiled code the statistic could be different, | |
1630 // for example, due to different inlining. | |
1631 if ((reason != Reason_rtm_state_change) && (trap_mdo != NULL) && | |
1632 UseRTMDeopt && (nm->rtm_state() != ProfileRTM)) { | |
1633 trap_mdo->atomic_set_rtm_state(ProfileRTM); | |
1634 } | |
1635 #endif | |
0 | 1636 } |
1637 | |
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1638 if (inc_recompile_count) { |
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1639 trap_mdo->inc_overflow_recompile_count(); |
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1640 if ((uint)trap_mdo->overflow_recompile_count() > |
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1641 (uint)PerBytecodeRecompilationCutoff) { |
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1642 // Give up on the method containing the bad BCI. |
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1643 if (trap_method() == nm->method()) { |
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1644 make_not_compilable = true; |
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1645 } else { |
7998 | 1646 trap_method->set_not_compilable(CompLevel_full_optimization, true, "overflow_recompile_count > PerBytecodeRecompilationCutoff"); |
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1647 // But give grace to the enclosing nm->method(). |
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1648 } |
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1649 } |
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1650 } |
0 | 1651 |
1783 | 1652 // Reprofile |
1653 if (reprofile) { | |
1654 CompilationPolicy::policy()->reprofile(trap_scope, nm->is_osr_method()); | |
0 | 1655 } |
1656 | |
1657 // Give up compiling | |
1783 | 1658 if (make_not_compilable && !nm->method()->is_not_compilable(CompLevel_full_optimization)) { |
0 | 1659 assert(make_not_entrant, "consistent"); |
1783 | 1660 nm->method()->set_not_compilable(CompLevel_full_optimization); |
0 | 1661 } |
1662 | |
1663 } // Free marked resources | |
1664 | |
1665 } | |
1666 JRT_END | |
1667 | |
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1668 MethodData* |
0 | 1669 Deoptimization::get_method_data(JavaThread* thread, methodHandle m, |
1670 bool create_if_missing) { | |
1671 Thread* THREAD = thread; | |
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1672 MethodData* mdo = m()->method_data(); |
0 | 1673 if (mdo == NULL && create_if_missing && !HAS_PENDING_EXCEPTION) { |
1674 // Build an MDO. Ignore errors like OutOfMemory; | |
1675 // that simply means we won't have an MDO to update. | |
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1676 Method::build_interpreter_method_data(m, THREAD); |
0 | 1677 if (HAS_PENDING_EXCEPTION) { |
1678 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); | |
1679 CLEAR_PENDING_EXCEPTION; | |
1680 } | |
1681 mdo = m()->method_data(); | |
1682 } | |
1683 return mdo; | |
1684 } | |
1685 | |
1686 ProfileData* | |
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1687 Deoptimization::query_update_method_data(MethodData* trap_mdo, |
0 | 1688 int trap_bci, |
1689 Deoptimization::DeoptReason reason, | |
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1690 Method* compiled_method, |
0 | 1691 //outputs: |
1692 uint& ret_this_trap_count, | |
1693 bool& ret_maybe_prior_trap, | |
1694 bool& ret_maybe_prior_recompile) { | |
1695 uint prior_trap_count = trap_mdo->trap_count(reason); | |
1696 uint this_trap_count = trap_mdo->inc_trap_count(reason); | |
1697 | |
1698 // If the runtime cannot find a place to store trap history, | |
1699 // it is estimated based on the general condition of the method. | |
1700 // If the method has ever been recompiled, or has ever incurred | |
1701 // a trap with the present reason , then this BCI is assumed | |
1702 // (pessimistically) to be the culprit. | |
1703 bool maybe_prior_trap = (prior_trap_count != 0); | |
1704 bool maybe_prior_recompile = (trap_mdo->decompile_count() != 0); | |
1705 ProfileData* pdata = NULL; | |
1706 | |
1707 | |
1708 // For reasons which are recorded per bytecode, we check per-BCI data. | |
1709 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
1710 if (per_bc_reason != Reason_none) { | |
1711 // Find the profile data for this BCI. If there isn't one, | |
1712 // try to allocate one from the MDO's set of spares. | |
1713 // This will let us detect a repeated trap at this point. | |
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1714 pdata = trap_mdo->allocate_bci_to_data(trap_bci, reason_is_speculate(reason) ? compiled_method : NULL); |
0 | 1715 |
1716 if (pdata != NULL) { | |
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1717 if (reason_is_speculate(reason) && !pdata->is_SpeculativeTrapData()) { |
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1718 if (LogCompilation && xtty != NULL) { |
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1719 ttyLocker ttyl; |
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1720 // no more room for speculative traps in this MDO |
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1721 xtty->elem("speculative_traps_oom"); |
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1722 } |
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1723 } |
0 | 1724 // Query the trap state of this profile datum. |
1725 int tstate0 = pdata->trap_state(); | |
1726 if (!trap_state_has_reason(tstate0, per_bc_reason)) | |
1727 maybe_prior_trap = false; | |
1728 if (!trap_state_is_recompiled(tstate0)) | |
1729 maybe_prior_recompile = false; | |
1730 | |
1731 // Update the trap state of this profile datum. | |
1732 int tstate1 = tstate0; | |
1733 // Record the reason. | |
1734 tstate1 = trap_state_add_reason(tstate1, per_bc_reason); | |
1735 // Store the updated state on the MDO, for next time. | |
1736 if (tstate1 != tstate0) | |
1737 pdata->set_trap_state(tstate1); | |
1738 } else { | |
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1739 if (LogCompilation && xtty != NULL) { |
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1740 ttyLocker ttyl; |
0 | 1741 // Missing MDP? Leave a small complaint in the log. |
1742 xtty->elem("missing_mdp bci='%d'", trap_bci); | |
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1743 } |
0 | 1744 } |
1745 } | |
1746 | |
1747 // Return results: | |
1748 ret_this_trap_count = this_trap_count; | |
1749 ret_maybe_prior_trap = maybe_prior_trap; | |
1750 ret_maybe_prior_recompile = maybe_prior_recompile; | |
1751 return pdata; | |
1752 } | |
1753 | |
1754 void | |
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1755 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
0 | 1756 ResourceMark rm; |
1757 // Ignored outputs: | |
1758 uint ignore_this_trap_count; | |
1759 bool ignore_maybe_prior_trap; | |
1760 bool ignore_maybe_prior_recompile; | |
17728
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1761 assert(!reason_is_speculate(reason), "reason speculate only used by compiler"); |
0 | 1762 query_update_method_data(trap_mdo, trap_bci, |
1763 (DeoptReason)reason, | |
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1764 NULL, |
0 | 1765 ignore_this_trap_count, |
1766 ignore_maybe_prior_trap, | |
1767 ignore_maybe_prior_recompile); | |
1768 } | |
1769 | |
1770 Deoptimization::UnrollBlock* Deoptimization::uncommon_trap(JavaThread* thread, jint trap_request) { | |
1771 | |
1772 // Still in Java no safepoints | |
1773 { | |
1774 // This enters VM and may safepoint | |
1775 uncommon_trap_inner(thread, trap_request); | |
1776 } | |
1777 return fetch_unroll_info_helper(thread); | |
1778 } | |
1779 | |
1780 // Local derived constants. | |
1781 // Further breakdown of DataLayout::trap_state, as promised by DataLayout. | |
1782 const int DS_REASON_MASK = DataLayout::trap_mask >> 1; | |
1783 const int DS_RECOMPILE_BIT = DataLayout::trap_mask - DS_REASON_MASK; | |
1784 | |
1785 //---------------------------trap_state_reason--------------------------------- | |
1786 Deoptimization::DeoptReason | |
1787 Deoptimization::trap_state_reason(int trap_state) { | |
1788 // This assert provides the link between the width of DataLayout::trap_bits | |
1789 // and the encoding of "recorded" reasons. It ensures there are enough | |
1790 // bits to store all needed reasons in the per-BCI MDO profile. | |
1791 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
1792 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1793 trap_state -= recompile_bit; | |
1794 if (trap_state == DS_REASON_MASK) { | |
1795 return Reason_many; | |
1796 } else { | |
1797 assert((int)Reason_none == 0, "state=0 => Reason_none"); | |
1798 return (DeoptReason)trap_state; | |
1799 } | |
1800 } | |
1801 //-------------------------trap_state_has_reason------------------------------- | |
1802 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
1803 assert(reason_is_recorded_per_bytecode((DeoptReason)reason), "valid reason"); | |
1804 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
1805 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1806 trap_state -= recompile_bit; | |
1807 if (trap_state == DS_REASON_MASK) { | |
1808 return -1; // true, unspecifically (bottom of state lattice) | |
1809 } else if (trap_state == reason) { | |
1810 return 1; // true, definitely | |
1811 } else if (trap_state == 0) { | |
1812 return 0; // false, definitely (top of state lattice) | |
1813 } else { | |
1814 return 0; // false, definitely | |
1815 } | |
1816 } | |
1817 //-------------------------trap_state_add_reason------------------------------- | |
1818 int Deoptimization::trap_state_add_reason(int trap_state, int reason) { | |
1819 assert(reason_is_recorded_per_bytecode((DeoptReason)reason) || reason == Reason_many, "valid reason"); | |
1820 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1821 trap_state -= recompile_bit; | |
1822 if (trap_state == DS_REASON_MASK) { | |
1823 return trap_state + recompile_bit; // already at state lattice bottom | |
1824 } else if (trap_state == reason) { | |
1825 return trap_state + recompile_bit; // the condition is already true | |
1826 } else if (trap_state == 0) { | |
1827 return reason + recompile_bit; // no condition has yet been true | |
1828 } else { | |
1829 return DS_REASON_MASK + recompile_bit; // fall to state lattice bottom | |
1830 } | |
1831 } | |
1832 //-----------------------trap_state_is_recompiled------------------------------ | |
1833 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
1834 return (trap_state & DS_RECOMPILE_BIT) != 0; | |
1835 } | |
1836 //-----------------------trap_state_set_recompiled----------------------------- | |
1837 int Deoptimization::trap_state_set_recompiled(int trap_state, bool z) { | |
1838 if (z) return trap_state | DS_RECOMPILE_BIT; | |
1839 else return trap_state & ~DS_RECOMPILE_BIT; | |
1840 } | |
1841 //---------------------------format_trap_state--------------------------------- | |
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1842 // This is used for debugging and diagnostics, including LogFile output. |
0 | 1843 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, |
1844 int trap_state) { | |
1845 DeoptReason reason = trap_state_reason(trap_state); | |
1846 bool recomp_flag = trap_state_is_recompiled(trap_state); | |
1847 // Re-encode the state from its decoded components. | |
1848 int decoded_state = 0; | |
1849 if (reason_is_recorded_per_bytecode(reason) || reason == Reason_many) | |
1850 decoded_state = trap_state_add_reason(decoded_state, reason); | |
1851 if (recomp_flag) | |
1852 decoded_state = trap_state_set_recompiled(decoded_state, recomp_flag); | |
1853 // If the state re-encodes properly, format it symbolically. | |
1854 // Because this routine is used for debugging and diagnostics, | |
1855 // be robust even if the state is a strange value. | |
1856 size_t len; | |
1857 if (decoded_state != trap_state) { | |
1858 // Random buggy state that doesn't decode?? | |
1859 len = jio_snprintf(buf, buflen, "#%d", trap_state); | |
1860 } else { | |
1861 len = jio_snprintf(buf, buflen, "%s%s", | |
1862 trap_reason_name(reason), | |
1863 recomp_flag ? " recompiled" : ""); | |
1864 } | |
1865 if (len >= buflen) | |
1866 buf[buflen-1] = '\0'; | |
1867 return buf; | |
1868 } | |
1869 | |
1870 | |
1871 //--------------------------------statics-------------------------------------- | |
1872 Deoptimization::DeoptAction Deoptimization::_unloaded_action | |
1873 = Deoptimization::Action_reinterpret; | |
1874 const char* Deoptimization::_trap_reason_name[Reason_LIMIT] = { | |
1875 // Note: Keep this in sync. with enum DeoptReason. | |
1876 "none", | |
1877 "null_check", | |
1878 "null_assert", | |
1879 "range_check", | |
1880 "class_check", | |
1881 "array_check", | |
1882 "intrinsic", | |
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1883 "bimorphic", |
0 | 1884 "unloaded", |
1885 "uninitialized", | |
1886 "unreached", | |
1887 "unhandled", | |
1888 "constraint", | |
1889 "div0_check", | |
1172 | 1890 "age", |
3345 | 1891 "predicate", |
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1892 "loop_limit_check", |
17780 | 1893 "speculate_class_check", |
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1894 "rtm_state_change", |
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1895 "unstable_if" |
0 | 1896 }; |
1897 const char* Deoptimization::_trap_action_name[Action_LIMIT] = { | |
1898 // Note: Keep this in sync. with enum DeoptAction. | |
1899 "none", | |
1900 "maybe_recompile", | |
1901 "reinterpret", | |
1902 "make_not_entrant", | |
1903 "make_not_compilable" | |
1904 }; | |
1905 | |
1906 const char* Deoptimization::trap_reason_name(int reason) { | |
1907 if (reason == Reason_many) return "many"; | |
1908 if ((uint)reason < Reason_LIMIT) | |
1909 return _trap_reason_name[reason]; | |
1910 static char buf[20]; | |
1911 sprintf(buf, "reason%d", reason); | |
1912 return buf; | |
1913 } | |
1914 const char* Deoptimization::trap_action_name(int action) { | |
1915 if ((uint)action < Action_LIMIT) | |
1916 return _trap_action_name[action]; | |
1917 static char buf[20]; | |
1918 sprintf(buf, "action%d", action); | |
1919 return buf; | |
1920 } | |
1921 | |
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1922 // This is used for debugging and diagnostics, including LogFile output. |
0 | 1923 const char* Deoptimization::format_trap_request(char* buf, size_t buflen, |
1924 int trap_request) { | |
1925 jint unloaded_class_index = trap_request_index(trap_request); | |
1926 const char* reason = trap_reason_name(trap_request_reason(trap_request)); | |
1927 const char* action = trap_action_name(trap_request_action(trap_request)); | |
1928 size_t len; | |
1929 if (unloaded_class_index < 0) { | |
1930 len = jio_snprintf(buf, buflen, "reason='%s' action='%s'", | |
1931 reason, action); | |
1932 } else { | |
1933 len = jio_snprintf(buf, buflen, "reason='%s' action='%s' index='%d'", | |
1934 reason, action, unloaded_class_index); | |
1935 } | |
1936 if (len >= buflen) | |
1937 buf[buflen-1] = '\0'; | |
1938 return buf; | |
1939 } | |
1940 | |
1941 juint Deoptimization::_deoptimization_hist | |
1942 [Deoptimization::Reason_LIMIT] | |
1943 [1 + Deoptimization::Action_LIMIT] | |
1944 [Deoptimization::BC_CASE_LIMIT] | |
1945 = {0}; | |
1946 | |
1947 enum { | |
1948 LSB_BITS = 8, | |
1949 LSB_MASK = right_n_bits(LSB_BITS) | |
1950 }; | |
1951 | |
1952 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
1953 Bytecodes::Code bc) { | |
1954 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
1955 assert(action >= 0 && action < Action_LIMIT, "oob"); | |
1956 _deoptimization_hist[Reason_none][0][0] += 1; // total | |
1957 _deoptimization_hist[reason][0][0] += 1; // per-reason total | |
1958 juint* cases = _deoptimization_hist[reason][1+action]; | |
1959 juint* bc_counter_addr = NULL; | |
1960 juint bc_counter = 0; | |
1961 // Look for an unused counter, or an exact match to this BC. | |
1962 if (bc != Bytecodes::_illegal) { | |
1963 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
1964 juint* counter_addr = &cases[bc_case]; | |
1965 juint counter = *counter_addr; | |
1966 if ((counter == 0 && bc_counter_addr == NULL) | |
1967 || (Bytecodes::Code)(counter & LSB_MASK) == bc) { | |
1968 // this counter is either free or is already devoted to this BC | |
1969 bc_counter_addr = counter_addr; | |
1970 bc_counter = counter | bc; | |
1971 } | |
1972 } | |
1973 } | |
1974 if (bc_counter_addr == NULL) { | |
1975 // Overflow, or no given bytecode. | |
1976 bc_counter_addr = &cases[BC_CASE_LIMIT-1]; | |
1977 bc_counter = (*bc_counter_addr & ~LSB_MASK); // clear LSB | |
1978 } | |
1979 *bc_counter_addr = bc_counter + (1 << LSB_BITS); | |
1980 } | |
1981 | |
1982 jint Deoptimization::total_deoptimization_count() { | |
1983 return _deoptimization_hist[Reason_none][0][0]; | |
1984 } | |
1985 | |
1986 jint Deoptimization::deoptimization_count(DeoptReason reason) { | |
1987 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
1988 return _deoptimization_hist[reason][0][0]; | |
1989 } | |
1990 | |
1991 void Deoptimization::print_statistics() { | |
1992 juint total = total_deoptimization_count(); | |
1993 juint account = total; | |
1994 if (total != 0) { | |
1995 ttyLocker ttyl; | |
1996 if (xtty != NULL) xtty->head("statistics type='deoptimization'"); | |
1997 tty->print_cr("Deoptimization traps recorded:"); | |
1998 #define PRINT_STAT_LINE(name, r) \ | |
1999 tty->print_cr(" %4d (%4.1f%%) %s", (int)(r), ((r) * 100.0) / total, name); | |
2000 PRINT_STAT_LINE("total", total); | |
2001 // For each non-zero entry in the histogram, print the reason, | |
2002 // the action, and (if specifically known) the type of bytecode. | |
2003 for (int reason = 0; reason < Reason_LIMIT; reason++) { | |
2004 for (int action = 0; action < Action_LIMIT; action++) { | |
2005 juint* cases = _deoptimization_hist[reason][1+action]; | |
2006 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
2007 juint counter = cases[bc_case]; | |
2008 if (counter != 0) { | |
2009 char name[1*K]; | |
2010 Bytecodes::Code bc = (Bytecodes::Code)(counter & LSB_MASK); | |
2011 if (bc_case == BC_CASE_LIMIT && (int)bc == 0) | |
2012 bc = Bytecodes::_illegal; | |
2013 sprintf(name, "%s/%s/%s", | |
2014 trap_reason_name(reason), | |
2015 trap_action_name(action), | |
2016 Bytecodes::is_defined(bc)? Bytecodes::name(bc): "other"); | |
2017 juint r = counter >> LSB_BITS; | |
2018 tty->print_cr(" %40s: " UINT32_FORMAT " (%.1f%%)", name, r, (r * 100.0) / total); | |
2019 account -= r; | |
2020 } | |
2021 } | |
2022 } | |
2023 } | |
2024 if (account != 0) { | |
2025 PRINT_STAT_LINE("unaccounted", account); | |
2026 } | |
2027 #undef PRINT_STAT_LINE | |
2028 if (xtty != NULL) xtty->tail("statistics"); | |
2029 } | |
2030 } | |
1692 | 2031 #else // COMPILER2 || SHARK |
0 | 2032 |
2033 | |
2034 // Stubs for C1 only system. | |
2035 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
2036 return false; | |
2037 } | |
2038 | |
2039 const char* Deoptimization::trap_reason_name(int reason) { | |
2040 return "unknown"; | |
2041 } | |
2042 | |
2043 void Deoptimization::print_statistics() { | |
2044 // no output | |
2045 } | |
2046 | |
2047 void | |
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2048 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
0 | 2049 // no udpate |
2050 } | |
2051 | |
2052 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
2053 return 0; | |
2054 } | |
2055 | |
2056 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
2057 Bytecodes::Code bc) { | |
2058 // no update | |
2059 } | |
2060 | |
2061 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
2062 int trap_state) { | |
2063 jio_snprintf(buf, buflen, "#%d", trap_state); | |
2064 return buf; | |
2065 } | |
2066 | |
1692 | 2067 #endif // COMPILER2 || SHARK |