Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/deoptimization.cpp @ 17794:3514ee402842
8029101: PPC64 (part 211): ordering of Independent Reads of Independent Writes
Reviewed-by: dholmes, kvn
Contributed-by: martin.doerr@sap.com
author | goetz |
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date | Thu, 16 Jan 2014 14:25:51 +0100 |
parents | 2b8e28fdf503 |
children | abec000618bf |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "code/debugInfoRec.hpp" | |
28 #include "code/nmethod.hpp" | |
29 #include "code/pcDesc.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "interpreter/bytecode.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/oopMapCache.hpp" | |
34 #include "memory/allocation.inline.hpp" | |
35 #include "memory/oopFactory.hpp" | |
36 #include "memory/resourceArea.hpp" | |
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37 #include "oops/method.hpp" |
1972 | 38 #include "oops/oop.inline.hpp" |
39 #include "prims/jvmtiThreadState.hpp" | |
40 #include "runtime/biasedLocking.hpp" | |
41 #include "runtime/compilationPolicy.hpp" | |
42 #include "runtime/deoptimization.hpp" | |
43 #include "runtime/interfaceSupport.hpp" | |
44 #include "runtime/sharedRuntime.hpp" | |
45 #include "runtime/signature.hpp" | |
46 #include "runtime/stubRoutines.hpp" | |
47 #include "runtime/thread.hpp" | |
48 #include "runtime/vframe.hpp" | |
49 #include "runtime/vframeArray.hpp" | |
50 #include "runtime/vframe_hp.hpp" | |
51 #include "utilities/events.hpp" | |
52 #include "utilities/xmlstream.hpp" | |
53 #ifdef TARGET_ARCH_x86 | |
54 # include "vmreg_x86.inline.hpp" | |
55 #endif | |
56 #ifdef TARGET_ARCH_sparc | |
57 # include "vmreg_sparc.inline.hpp" | |
58 #endif | |
59 #ifdef TARGET_ARCH_zero | |
60 # include "vmreg_zero.inline.hpp" | |
61 #endif | |
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62 #ifdef TARGET_ARCH_arm |
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63 # include "vmreg_arm.inline.hpp" |
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64 #endif |
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65 #ifdef TARGET_ARCH_ppc |
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66 # include "vmreg_ppc.inline.hpp" |
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67 #endif |
1972 | 68 #ifdef COMPILER2 |
69 #ifdef TARGET_ARCH_MODEL_x86_32 | |
70 # include "adfiles/ad_x86_32.hpp" | |
71 #endif | |
72 #ifdef TARGET_ARCH_MODEL_x86_64 | |
73 # include "adfiles/ad_x86_64.hpp" | |
74 #endif | |
75 #ifdef TARGET_ARCH_MODEL_sparc | |
76 # include "adfiles/ad_sparc.hpp" | |
77 #endif | |
78 #ifdef TARGET_ARCH_MODEL_zero | |
79 # include "adfiles/ad_zero.hpp" | |
80 #endif | |
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81 #ifdef TARGET_ARCH_MODEL_arm |
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82 # include "adfiles/ad_arm.hpp" |
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83 #endif |
14391 | 84 #ifdef TARGET_ARCH_MODEL_ppc_32 |
85 # include "adfiles/ad_ppc_32.hpp" | |
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86 #endif |
14391 | 87 #ifdef TARGET_ARCH_MODEL_ppc_64 |
88 # include "adfiles/ad_ppc_64.hpp" | |
1972 | 89 #endif |
14391 | 90 #endif // COMPILER2 |
0 | 91 |
92 bool DeoptimizationMarker::_is_active = false; | |
93 | |
94 Deoptimization::UnrollBlock::UnrollBlock(int size_of_deoptimized_frame, | |
95 int caller_adjustment, | |
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96 int caller_actual_parameters, |
0 | 97 int number_of_frames, |
98 intptr_t* frame_sizes, | |
99 address* frame_pcs, | |
100 BasicType return_type) { | |
101 _size_of_deoptimized_frame = size_of_deoptimized_frame; | |
102 _caller_adjustment = caller_adjustment; | |
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103 _caller_actual_parameters = caller_actual_parameters; |
0 | 104 _number_of_frames = number_of_frames; |
105 _frame_sizes = frame_sizes; | |
106 _frame_pcs = frame_pcs; | |
6197 | 107 _register_block = NEW_C_HEAP_ARRAY(intptr_t, RegisterMap::reg_count * 2, mtCompiler); |
0 | 108 _return_type = return_type; |
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109 _initial_info = 0; |
0 | 110 // PD (x86 only) |
111 _counter_temp = 0; | |
112 _unpack_kind = 0; | |
113 _sender_sp_temp = 0; | |
114 | |
115 _total_frame_sizes = size_of_frames(); | |
116 } | |
117 | |
118 | |
119 Deoptimization::UnrollBlock::~UnrollBlock() { | |
6197 | 120 FREE_C_HEAP_ARRAY(intptr_t, _frame_sizes, mtCompiler); |
121 FREE_C_HEAP_ARRAY(intptr_t, _frame_pcs, mtCompiler); | |
122 FREE_C_HEAP_ARRAY(intptr_t, _register_block, mtCompiler); | |
0 | 123 } |
124 | |
125 | |
126 intptr_t* Deoptimization::UnrollBlock::value_addr_at(int register_number) const { | |
127 assert(register_number < RegisterMap::reg_count, "checking register number"); | |
128 return &_register_block[register_number * 2]; | |
129 } | |
130 | |
131 | |
132 | |
133 int Deoptimization::UnrollBlock::size_of_frames() const { | |
134 // Acount first for the adjustment of the initial frame | |
135 int result = _caller_adjustment; | |
136 for (int index = 0; index < number_of_frames(); index++) { | |
137 result += frame_sizes()[index]; | |
138 } | |
139 return result; | |
140 } | |
141 | |
142 | |
143 void Deoptimization::UnrollBlock::print() { | |
144 ttyLocker ttyl; | |
145 tty->print_cr("UnrollBlock"); | |
146 tty->print_cr(" size_of_deoptimized_frame = %d", _size_of_deoptimized_frame); | |
147 tty->print( " frame_sizes: "); | |
148 for (int index = 0; index < number_of_frames(); index++) { | |
149 tty->print("%d ", frame_sizes()[index]); | |
150 } | |
151 tty->cr(); | |
152 } | |
153 | |
154 | |
155 // In order to make fetch_unroll_info work properly with escape | |
156 // analysis, The method was changed from JRT_LEAF to JRT_BLOCK_ENTRY and | |
157 // ResetNoHandleMark and HandleMark were removed from it. The actual reallocation | |
158 // of previously eliminated objects occurs in realloc_objects, which is | |
159 // called from the method fetch_unroll_info_helper below. | |
160 JRT_BLOCK_ENTRY(Deoptimization::UnrollBlock*, Deoptimization::fetch_unroll_info(JavaThread* thread)) | |
161 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
162 // but makes the entry a little slower. There is however a little dance we have to | |
163 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
164 | |
165 // fetch_unroll_info() is called at the beginning of the deoptimization | |
166 // handler. Note this fact before we start generating temporary frames | |
167 // that can confuse an asynchronous stack walker. This counter is | |
168 // decremented at the end of unpack_frames(). | |
169 thread->inc_in_deopt_handler(); | |
170 | |
171 return fetch_unroll_info_helper(thread); | |
172 JRT_END | |
173 | |
174 | |
175 // This is factored, since it is both called from a JRT_LEAF (deoptimization) and a JRT_ENTRY (uncommon_trap) | |
176 Deoptimization::UnrollBlock* Deoptimization::fetch_unroll_info_helper(JavaThread* thread) { | |
177 | |
178 // Note: there is a safepoint safety issue here. No matter whether we enter | |
179 // via vanilla deopt or uncommon trap we MUST NOT stop at a safepoint once | |
180 // the vframeArray is created. | |
181 // | |
182 | |
183 // Allocate our special deoptimization ResourceMark | |
184 DeoptResourceMark* dmark = new DeoptResourceMark(thread); | |
185 assert(thread->deopt_mark() == NULL, "Pending deopt!"); | |
186 thread->set_deopt_mark(dmark); | |
187 | |
188 frame stub_frame = thread->last_frame(); // Makes stack walkable as side effect | |
189 RegisterMap map(thread, true); | |
190 RegisterMap dummy_map(thread, false); | |
191 // Now get the deoptee with a valid map | |
192 frame deoptee = stub_frame.sender(&map); | |
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193 // Set the deoptee nmethod |
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194 assert(thread->deopt_nmethod() == NULL, "Pending deopt!"); |
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195 thread->set_deopt_nmethod(deoptee.cb()->as_nmethod_or_null()); |
0 | 196 |
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197 if (VerifyStack) { |
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198 thread->validate_frame_layout(); |
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199 } |
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200 |
0 | 201 // Create a growable array of VFrames where each VFrame represents an inlined |
202 // Java frame. This storage is allocated with the usual system arena. | |
203 assert(deoptee.is_compiled_frame(), "Wrong frame type"); | |
204 GrowableArray<compiledVFrame*>* chunk = new GrowableArray<compiledVFrame*>(10); | |
205 vframe* vf = vframe::new_vframe(&deoptee, &map, thread); | |
206 while (!vf->is_top()) { | |
207 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
208 chunk->push(compiledVFrame::cast(vf)); | |
209 vf = vf->sender(); | |
210 } | |
211 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
212 chunk->push(compiledVFrame::cast(vf)); | |
213 | |
214 #ifdef COMPILER2 | |
215 // Reallocate the non-escaping objects and restore their fields. Then | |
216 // relock objects if synchronization on them was eliminated. | |
4777 | 217 if (DoEscapeAnalysis || EliminateNestedLocks) { |
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218 if (EliminateAllocations) { |
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219 assert (chunk->at(0)->scope() != NULL,"expect only compiled java frames"); |
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220 GrowableArray<ScopeValue*>* objects = chunk->at(0)->scope()->objects(); |
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221 |
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222 // The flag return_oop() indicates call sites which return oop |
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223 // in compiled code. Such sites include java method calls, |
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224 // runtime calls (for example, used to allocate new objects/arrays |
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225 // on slow code path) and any other calls generated in compiled code. |
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226 // It is not guaranteed that we can get such information here only |
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227 // by analyzing bytecode in deoptimized frames. This is why this flag |
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228 // is set during method compilation (see Compile::Process_OopMap_Node()). |
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229 bool save_oop_result = chunk->at(0)->scope()->return_oop(); |
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230 Handle return_value; |
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231 if (save_oop_result) { |
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232 // Reallocation may trigger GC. If deoptimization happened on return from |
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233 // call which returns oop we need to save it since it is not in oopmap. |
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234 oop result = deoptee.saved_oop_result(&map); |
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235 assert(result == NULL || result->is_oop(), "must be oop"); |
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236 return_value = Handle(thread, result); |
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237 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); |
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238 if (TraceDeoptimization) { |
6843 | 239 ttyLocker ttyl; |
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240 tty->print_cr("SAVED OOP RESULT " INTPTR_FORMAT " in thread " INTPTR_FORMAT, (void *)result, thread); |
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241 } |
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242 } |
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243 bool reallocated = false; |
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244 if (objects != NULL) { |
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245 JRT_BLOCK |
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246 reallocated = realloc_objects(thread, &deoptee, objects, THREAD); |
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247 JRT_END |
0 | 248 } |
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249 if (reallocated) { |
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250 reassign_fields(&deoptee, &map, objects); |
0 | 251 #ifndef PRODUCT |
252 if (TraceDeoptimization) { | |
253 ttyLocker ttyl; | |
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254 tty->print_cr("REALLOC OBJECTS in thread " INTPTR_FORMAT, thread); |
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255 print_objects(objects); |
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256 } |
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257 #endif |
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258 } |
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259 if (save_oop_result) { |
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260 // Restore result. |
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261 deoptee.set_saved_oop_result(&map, return_value()); |
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262 } |
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263 } |
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264 if (EliminateLocks) { |
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265 #ifndef PRODUCT |
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266 bool first = true; |
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267 #endif |
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268 for (int i = 0; i < chunk->length(); i++) { |
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269 compiledVFrame* cvf = chunk->at(i); |
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270 assert (cvf->scope() != NULL,"expect only compiled java frames"); |
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271 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); |
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272 if (monitors->is_nonempty()) { |
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273 relock_objects(monitors, thread); |
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274 #ifndef PRODUCT |
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275 if (TraceDeoptimization) { |
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276 ttyLocker ttyl; |
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277 for (int j = 0; j < monitors->length(); j++) { |
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278 MonitorInfo* mi = monitors->at(j); |
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279 if (mi->eliminated()) { |
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280 if (first) { |
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281 first = false; |
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282 tty->print_cr("RELOCK OBJECTS in thread " INTPTR_FORMAT, thread); |
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283 } |
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284 tty->print_cr(" object <" INTPTR_FORMAT "> locked", (void *)mi->owner()); |
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285 } |
0 | 286 } |
287 } | |
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288 #endif |
0 | 289 } |
290 } | |
291 } | |
292 } | |
293 #endif // COMPILER2 | |
294 // Ensure that no safepoint is taken after pointers have been stored | |
295 // in fields of rematerialized objects. If a safepoint occurs from here on | |
296 // out the java state residing in the vframeArray will be missed. | |
297 No_Safepoint_Verifier no_safepoint; | |
298 | |
299 vframeArray* array = create_vframeArray(thread, deoptee, &map, chunk); | |
300 | |
301 assert(thread->vframe_array_head() == NULL, "Pending deopt!");; | |
302 thread->set_vframe_array_head(array); | |
303 | |
304 // Now that the vframeArray has been created if we have any deferred local writes | |
305 // added by jvmti then we can free up that structure as the data is now in the | |
306 // vframeArray | |
307 | |
308 if (thread->deferred_locals() != NULL) { | |
309 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread->deferred_locals(); | |
310 int i = 0; | |
311 do { | |
312 // Because of inlining we could have multiple vframes for a single frame | |
313 // and several of the vframes could have deferred writes. Find them all. | |
314 if (list->at(i)->id() == array->original().id()) { | |
315 jvmtiDeferredLocalVariableSet* dlv = list->at(i); | |
316 list->remove_at(i); | |
317 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
318 delete dlv; | |
319 } else { | |
320 i++; | |
321 } | |
322 } while ( i < list->length() ); | |
323 if (list->length() == 0) { | |
324 thread->set_deferred_locals(NULL); | |
325 // free the list and elements back to C heap. | |
326 delete list; | |
327 } | |
328 | |
329 } | |
330 | |
1692 | 331 #ifndef SHARK |
0 | 332 // Compute the caller frame based on the sender sp of stub_frame and stored frame sizes info. |
333 CodeBlob* cb = stub_frame.cb(); | |
334 // Verify we have the right vframeArray | |
335 assert(cb->frame_size() >= 0, "Unexpected frame size"); | |
336 intptr_t* unpack_sp = stub_frame.sp() + cb->frame_size(); | |
337 | |
1204 | 338 // If the deopt call site is a MethodHandle invoke call site we have |
339 // to adjust the unpack_sp. | |
340 nmethod* deoptee_nm = deoptee.cb()->as_nmethod_or_null(); | |
341 if (deoptee_nm != NULL && deoptee_nm->is_method_handle_return(deoptee.pc())) | |
342 unpack_sp = deoptee.unextended_sp(); | |
343 | |
0 | 344 #ifdef ASSERT |
345 assert(cb->is_deoptimization_stub() || cb->is_uncommon_trap_stub(), "just checking"); | |
346 #endif | |
1692 | 347 #else |
348 intptr_t* unpack_sp = stub_frame.sender(&dummy_map).unextended_sp(); | |
349 #endif // !SHARK | |
350 | |
0 | 351 // This is a guarantee instead of an assert because if vframe doesn't match |
352 // we will unpack the wrong deoptimized frame and wind up in strange places | |
353 // where it will be very difficult to figure out what went wrong. Better | |
354 // to die an early death here than some very obscure death later when the | |
355 // trail is cold. | |
356 // Note: on ia64 this guarantee can be fooled by frames with no memory stack | |
357 // in that it will fail to detect a problem when there is one. This needs | |
358 // more work in tiger timeframe. | |
359 guarantee(array->unextended_sp() == unpack_sp, "vframe_array_head must contain the vframeArray to unpack"); | |
360 | |
361 int number_of_frames = array->frames(); | |
362 | |
363 // Compute the vframes' sizes. Note that frame_sizes[] entries are ordered from outermost to innermost | |
364 // virtual activation, which is the reverse of the elements in the vframes array. | |
6197 | 365 intptr_t* frame_sizes = NEW_C_HEAP_ARRAY(intptr_t, number_of_frames, mtCompiler); |
0 | 366 // +1 because we always have an interpreter return address for the final slot. |
6197 | 367 address* frame_pcs = NEW_C_HEAP_ARRAY(address, number_of_frames + 1, mtCompiler); |
0 | 368 int popframe_extra_args = 0; |
369 // Create an interpreter return address for the stub to use as its return | |
370 // address so the skeletal frames are perfectly walkable | |
371 frame_pcs[number_of_frames] = Interpreter::deopt_entry(vtos, 0); | |
372 | |
373 // PopFrame requires that the preserved incoming arguments from the recently-popped topmost | |
374 // activation be put back on the expression stack of the caller for reexecution | |
375 if (JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) { | |
376 popframe_extra_args = in_words(thread->popframe_preserved_args_size_in_words()); | |
377 } | |
378 | |
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379 // Find the current pc for sender of the deoptee. Since the sender may have been deoptimized |
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380 // itself since the deoptee vframeArray was created we must get a fresh value of the pc rather |
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381 // than simply use array->sender.pc(). This requires us to walk the current set of frames |
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382 // |
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383 frame deopt_sender = stub_frame.sender(&dummy_map); // First is the deoptee frame |
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384 deopt_sender = deopt_sender.sender(&dummy_map); // Now deoptee caller |
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385 |
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386 // It's possible that the number of paramters at the call site is |
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387 // different than number of arguments in the callee when method |
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388 // handles are used. If the caller is interpreted get the real |
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389 // value so that the proper amount of space can be added to it's |
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390 // frame. |
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391 bool caller_was_method_handle = false; |
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392 if (deopt_sender.is_interpreted_frame()) { |
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393 methodHandle method = deopt_sender.interpreter_frame_method(); |
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394 Bytecode_invoke cur = Bytecode_invoke_check(method, deopt_sender.interpreter_frame_bci()); |
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395 if (cur.is_invokedynamic() || cur.is_invokehandle()) { |
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396 // Method handle invokes may involve fairly arbitrary chains of |
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397 // calls so it's impossible to know how much actual space the |
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398 // caller has for locals. |
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399 caller_was_method_handle = true; |
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400 } |
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401 } |
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402 |
0 | 403 // |
404 // frame_sizes/frame_pcs[0] oldest frame (int or c2i) | |
405 // frame_sizes/frame_pcs[1] next oldest frame (int) | |
406 // frame_sizes/frame_pcs[n] youngest frame (int) | |
407 // | |
408 // Now a pc in frame_pcs is actually the return address to the frame's caller (a frame | |
409 // owns the space for the return address to it's caller). Confusing ain't it. | |
410 // | |
411 // The vframe array can address vframes with indices running from | |
412 // 0.._frames-1. Index 0 is the youngest frame and _frame - 1 is the oldest (root) frame. | |
413 // When we create the skeletal frames we need the oldest frame to be in the zero slot | |
414 // in the frame_sizes/frame_pcs so the assembly code can do a trivial walk. | |
415 // so things look a little strange in this loop. | |
416 // | |
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417 int callee_parameters = 0; |
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418 int callee_locals = 0; |
0 | 419 for (int index = 0; index < array->frames(); index++ ) { |
420 // frame[number_of_frames - 1 ] = on_stack_size(youngest) | |
421 // frame[number_of_frames - 2 ] = on_stack_size(sender(youngest)) | |
422 // frame[number_of_frames - 3 ] = on_stack_size(sender(sender(youngest))) | |
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423 int caller_parms = callee_parameters; |
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424 if ((index == array->frames() - 1) && caller_was_method_handle) { |
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425 caller_parms = 0; |
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426 } |
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427 frame_sizes[number_of_frames - 1 - index] = BytesPerWord * array->element(index)->on_stack_size(caller_parms, |
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428 callee_parameters, |
0 | 429 callee_locals, |
430 index == 0, | |
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431 index == array->frames() - 1, |
0 | 432 popframe_extra_args); |
433 // This pc doesn't have to be perfect just good enough to identify the frame | |
434 // as interpreted so the skeleton frame will be walkable | |
435 // The correct pc will be set when the skeleton frame is completely filled out | |
436 // The final pc we store in the loop is wrong and will be overwritten below | |
437 frame_pcs[number_of_frames - 1 - index ] = Interpreter::deopt_entry(vtos, 0) - frame::pc_return_offset; | |
438 | |
439 callee_parameters = array->element(index)->method()->size_of_parameters(); | |
440 callee_locals = array->element(index)->method()->max_locals(); | |
441 popframe_extra_args = 0; | |
442 } | |
443 | |
444 // Compute whether the root vframe returns a float or double value. | |
445 BasicType return_type; | |
446 { | |
447 HandleMark hm; | |
448 methodHandle method(thread, array->element(0)->method()); | |
2142 | 449 Bytecode_invoke invoke = Bytecode_invoke_check(method, array->element(0)->bci()); |
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450 return_type = invoke.is_valid() ? invoke.result_type() : T_ILLEGAL; |
0 | 451 } |
452 | |
453 // Compute information for handling adapters and adjusting the frame size of the caller. | |
454 int caller_adjustment = 0; | |
455 | |
456 // Compute the amount the oldest interpreter frame will have to adjust | |
457 // its caller's stack by. If the caller is a compiled frame then | |
458 // we pretend that the callee has no parameters so that the | |
459 // extension counts for the full amount of locals and not just | |
460 // locals-parms. This is because without a c2i adapter the parm | |
461 // area as created by the compiled frame will not be usable by | |
462 // the interpreter. (Depending on the calling convention there | |
463 // may not even be enough space). | |
464 | |
465 // QQQ I'd rather see this pushed down into last_frame_adjust | |
466 // and have it take the sender (aka caller). | |
467 | |
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468 if (deopt_sender.is_compiled_frame() || caller_was_method_handle) { |
0 | 469 caller_adjustment = last_frame_adjust(0, callee_locals); |
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470 } else if (callee_locals > callee_parameters) { |
0 | 471 // The caller frame may need extending to accommodate |
472 // non-parameter locals of the first unpacked interpreted frame. | |
473 // Compute that adjustment. | |
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474 caller_adjustment = last_frame_adjust(callee_parameters, callee_locals); |
0 | 475 } |
476 | |
477 // If the sender is deoptimized the we must retrieve the address of the handler | |
478 // since the frame will "magically" show the original pc before the deopt | |
479 // and we'd undo the deopt. | |
480 | |
481 frame_pcs[0] = deopt_sender.raw_pc(); | |
482 | |
1692 | 483 #ifndef SHARK |
0 | 484 assert(CodeCache::find_blob_unsafe(frame_pcs[0]) != NULL, "bad pc"); |
1692 | 485 #endif // SHARK |
0 | 486 |
487 UnrollBlock* info = new UnrollBlock(array->frame_size() * BytesPerWord, | |
488 caller_adjustment * BytesPerWord, | |
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489 caller_was_method_handle ? 0 : callee_parameters, |
0 | 490 number_of_frames, |
491 frame_sizes, | |
492 frame_pcs, | |
493 return_type); | |
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494 // On some platforms, we need a way to pass some platform dependent |
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495 // information to the unpacking code so the skeletal frames come out |
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496 // correct (initial fp value, unextended sp, ...) |
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497 info->set_initial_info((intptr_t) array->sender().initial_deoptimization_info()); |
0 | 498 |
499 if (array->frames() > 1) { | |
500 if (VerifyStack && TraceDeoptimization) { | |
6843 | 501 ttyLocker ttyl; |
0 | 502 tty->print_cr("Deoptimizing method containing inlining"); |
503 } | |
504 } | |
505 | |
506 array->set_unroll_block(info); | |
507 return info; | |
508 } | |
509 | |
510 // Called to cleanup deoptimization data structures in normal case | |
511 // after unpacking to stack and when stack overflow error occurs | |
512 void Deoptimization::cleanup_deopt_info(JavaThread *thread, | |
513 vframeArray *array) { | |
514 | |
515 // Get array if coming from exception | |
516 if (array == NULL) { | |
517 array = thread->vframe_array_head(); | |
518 } | |
519 thread->set_vframe_array_head(NULL); | |
520 | |
521 // Free the previous UnrollBlock | |
522 vframeArray* old_array = thread->vframe_array_last(); | |
523 thread->set_vframe_array_last(array); | |
524 | |
525 if (old_array != NULL) { | |
526 UnrollBlock* old_info = old_array->unroll_block(); | |
527 old_array->set_unroll_block(NULL); | |
528 delete old_info; | |
529 delete old_array; | |
530 } | |
531 | |
532 // Deallocate any resource creating in this routine and any ResourceObjs allocated | |
533 // inside the vframeArray (StackValueCollections) | |
534 | |
535 delete thread->deopt_mark(); | |
536 thread->set_deopt_mark(NULL); | |
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537 thread->set_deopt_nmethod(NULL); |
0 | 538 |
539 | |
540 if (JvmtiExport::can_pop_frame()) { | |
541 #ifndef CC_INTERP | |
542 // Regardless of whether we entered this routine with the pending | |
543 // popframe condition bit set, we should always clear it now | |
544 thread->clear_popframe_condition(); | |
545 #else | |
546 // C++ interpeter will clear has_pending_popframe when it enters | |
547 // with method_resume. For deopt_resume2 we clear it now. | |
548 if (thread->popframe_forcing_deopt_reexecution()) | |
549 thread->clear_popframe_condition(); | |
550 #endif /* CC_INTERP */ | |
551 } | |
552 | |
553 // unpack_frames() is called at the end of the deoptimization handler | |
554 // and (in C2) at the end of the uncommon trap handler. Note this fact | |
555 // so that an asynchronous stack walker can work again. This counter is | |
556 // incremented at the beginning of fetch_unroll_info() and (in C2) at | |
557 // the beginning of uncommon_trap(). | |
558 thread->dec_in_deopt_handler(); | |
559 } | |
560 | |
561 | |
562 // Return BasicType of value being returned | |
563 JRT_LEAF(BasicType, Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)) | |
564 | |
565 // We are already active int he special DeoptResourceMark any ResourceObj's we | |
566 // allocate will be freed at the end of the routine. | |
567 | |
568 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
569 // but makes the entry a little slower. There is however a little dance we have to | |
570 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
571 ResetNoHandleMark rnhm; // No-op in release/product versions | |
572 HandleMark hm; | |
573 | |
574 frame stub_frame = thread->last_frame(); | |
575 | |
576 // Since the frame to unpack is the top frame of this thread, the vframe_array_head | |
577 // must point to the vframeArray for the unpack frame. | |
578 vframeArray* array = thread->vframe_array_head(); | |
579 | |
580 #ifndef PRODUCT | |
581 if (TraceDeoptimization) { | |
6843 | 582 ttyLocker ttyl; |
0 | 583 tty->print_cr("DEOPT UNPACKING thread " INTPTR_FORMAT " vframeArray " INTPTR_FORMAT " mode %d", thread, array, exec_mode); |
584 } | |
585 #endif | |
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586 Events::log(thread, "DEOPT UNPACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT " mode %d", |
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587 stub_frame.pc(), stub_frame.sp(), exec_mode); |
0 | 588 |
589 UnrollBlock* info = array->unroll_block(); | |
590 | |
591 // Unpack the interpreter frames and any adapter frame (c2 only) we might create. | |
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592 array->unpack_to_stack(stub_frame, exec_mode, info->caller_actual_parameters()); |
0 | 593 |
594 BasicType bt = info->return_type(); | |
595 | |
596 // If we have an exception pending, claim that the return type is an oop | |
597 // so the deopt_blob does not overwrite the exception_oop. | |
598 | |
599 if (exec_mode == Unpack_exception) | |
600 bt = T_OBJECT; | |
601 | |
602 // Cleanup thread deopt data | |
603 cleanup_deopt_info(thread, array); | |
604 | |
605 #ifndef PRODUCT | |
606 if (VerifyStack) { | |
607 ResourceMark res_mark; | |
608 | |
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609 thread->validate_frame_layout(); |
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610 |
0 | 611 // Verify that the just-unpacked frames match the interpreter's |
612 // notions of expression stack and locals | |
613 vframeArray* cur_array = thread->vframe_array_last(); | |
614 RegisterMap rm(thread, false); | |
615 rm.set_include_argument_oops(false); | |
616 bool is_top_frame = true; | |
617 int callee_size_of_parameters = 0; | |
618 int callee_max_locals = 0; | |
619 for (int i = 0; i < cur_array->frames(); i++) { | |
620 vframeArrayElement* el = cur_array->element(i); | |
621 frame* iframe = el->iframe(); | |
622 guarantee(iframe->is_interpreted_frame(), "Wrong frame type"); | |
623 | |
624 // Get the oop map for this bci | |
625 InterpreterOopMap mask; | |
626 int cur_invoke_parameter_size = 0; | |
627 bool try_next_mask = false; | |
628 int next_mask_expression_stack_size = -1; | |
629 int top_frame_expression_stack_adjustment = 0; | |
630 methodHandle mh(thread, iframe->interpreter_frame_method()); | |
631 OopMapCache::compute_one_oop_map(mh, iframe->interpreter_frame_bci(), &mask); | |
632 BytecodeStream str(mh); | |
633 str.set_start(iframe->interpreter_frame_bci()); | |
634 int max_bci = mh->code_size(); | |
635 // Get to the next bytecode if possible | |
636 assert(str.bci() < max_bci, "bci in interpreter frame out of bounds"); | |
637 // Check to see if we can grab the number of outgoing arguments | |
638 // at an uncommon trap for an invoke (where the compiler | |
639 // generates debug info before the invoke has executed) | |
640 Bytecodes::Code cur_code = str.next(); | |
10390 | 641 if (cur_code == Bytecodes::_invokevirtual || |
642 cur_code == Bytecodes::_invokespecial || | |
643 cur_code == Bytecodes::_invokestatic || | |
644 cur_code == Bytecodes::_invokeinterface || | |
645 cur_code == Bytecodes::_invokedynamic) { | |
2142 | 646 Bytecode_invoke invoke(mh, iframe->interpreter_frame_bci()); |
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647 Symbol* signature = invoke.signature(); |
0 | 648 ArgumentSizeComputer asc(signature); |
649 cur_invoke_parameter_size = asc.size(); | |
10390 | 650 if (invoke.has_receiver()) { |
0 | 651 // Add in receiver |
652 ++cur_invoke_parameter_size; | |
653 } | |
10390 | 654 if (i != 0 && !invoke.is_invokedynamic() && MethodHandles::has_member_arg(invoke.klass(), invoke.name())) { |
655 callee_size_of_parameters++; | |
656 } | |
0 | 657 } |
658 if (str.bci() < max_bci) { | |
659 Bytecodes::Code bc = str.next(); | |
660 if (bc >= 0) { | |
661 // The interpreter oop map generator reports results before | |
662 // the current bytecode has executed except in the case of | |
663 // calls. It seems to be hard to tell whether the compiler | |
664 // has emitted debug information matching the "state before" | |
665 // a given bytecode or the state after, so we try both | |
666 switch (cur_code) { | |
667 case Bytecodes::_invokevirtual: | |
668 case Bytecodes::_invokespecial: | |
669 case Bytecodes::_invokestatic: | |
670 case Bytecodes::_invokeinterface: | |
10390 | 671 case Bytecodes::_invokedynamic: |
0 | 672 case Bytecodes::_athrow: |
673 break; | |
674 default: { | |
675 InterpreterOopMap next_mask; | |
676 OopMapCache::compute_one_oop_map(mh, str.bci(), &next_mask); | |
677 next_mask_expression_stack_size = next_mask.expression_stack_size(); | |
678 // Need to subtract off the size of the result type of | |
679 // the bytecode because this is not described in the | |
680 // debug info but returned to the interpreter in the TOS | |
681 // caching register | |
682 BasicType bytecode_result_type = Bytecodes::result_type(cur_code); | |
683 if (bytecode_result_type != T_ILLEGAL) { | |
684 top_frame_expression_stack_adjustment = type2size[bytecode_result_type]; | |
685 } | |
686 assert(top_frame_expression_stack_adjustment >= 0, ""); | |
687 try_next_mask = true; | |
688 break; | |
689 } | |
690 } | |
691 } | |
692 } | |
693 | |
694 // Verify stack depth and oops in frame | |
695 // This assertion may be dependent on the platform we're running on and may need modification (tested on x86 and sparc) | |
696 if (!( | |
697 /* SPARC */ | |
698 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_size_of_parameters) || | |
699 /* x86 */ | |
700 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_max_locals) || | |
701 (try_next_mask && | |
702 (iframe->interpreter_frame_expression_stack_size() == (next_mask_expression_stack_size - | |
703 top_frame_expression_stack_adjustment))) || | |
704 (is_top_frame && (exec_mode == Unpack_exception) && iframe->interpreter_frame_expression_stack_size() == 0) || | |
705 (is_top_frame && (exec_mode == Unpack_uncommon_trap || exec_mode == Unpack_reexecute) && | |
706 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + cur_invoke_parameter_size)) | |
707 )) { | |
708 ttyLocker ttyl; | |
709 | |
710 // Print out some information that will help us debug the problem | |
711 tty->print_cr("Wrong number of expression stack elements during deoptimization"); | |
712 tty->print_cr(" Error occurred while verifying frame %d (0..%d, 0 is topmost)", i, cur_array->frames() - 1); | |
713 tty->print_cr(" Fabricated interpreter frame had %d expression stack elements", | |
714 iframe->interpreter_frame_expression_stack_size()); | |
715 tty->print_cr(" Interpreter oop map had %d expression stack elements", mask.expression_stack_size()); | |
716 tty->print_cr(" try_next_mask = %d", try_next_mask); | |
717 tty->print_cr(" next_mask_expression_stack_size = %d", next_mask_expression_stack_size); | |
718 tty->print_cr(" callee_size_of_parameters = %d", callee_size_of_parameters); | |
719 tty->print_cr(" callee_max_locals = %d", callee_max_locals); | |
720 tty->print_cr(" top_frame_expression_stack_adjustment = %d", top_frame_expression_stack_adjustment); | |
721 tty->print_cr(" exec_mode = %d", exec_mode); | |
722 tty->print_cr(" cur_invoke_parameter_size = %d", cur_invoke_parameter_size); | |
723 tty->print_cr(" Thread = " INTPTR_FORMAT ", thread ID = " UINTX_FORMAT, thread, thread->osthread()->thread_id()); | |
724 tty->print_cr(" Interpreted frames:"); | |
725 for (int k = 0; k < cur_array->frames(); k++) { | |
726 vframeArrayElement* el = cur_array->element(k); | |
727 tty->print_cr(" %s (bci %d)", el->method()->name_and_sig_as_C_string(), el->bci()); | |
728 } | |
729 cur_array->print_on_2(tty); | |
730 guarantee(false, "wrong number of expression stack elements during deopt"); | |
731 } | |
732 VerifyOopClosure verify; | |
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733 iframe->oops_interpreted_do(&verify, NULL, &rm, false); |
0 | 734 callee_size_of_parameters = mh->size_of_parameters(); |
735 callee_max_locals = mh->max_locals(); | |
736 is_top_frame = false; | |
737 } | |
738 } | |
739 #endif /* !PRODUCT */ | |
740 | |
741 | |
742 return bt; | |
743 JRT_END | |
744 | |
745 | |
746 int Deoptimization::deoptimize_dependents() { | |
747 Threads::deoptimized_wrt_marked_nmethods(); | |
748 return 0; | |
749 } | |
750 | |
751 | |
752 #ifdef COMPILER2 | |
753 bool Deoptimization::realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS) { | |
754 Handle pending_exception(thread->pending_exception()); | |
755 const char* exception_file = thread->exception_file(); | |
756 int exception_line = thread->exception_line(); | |
757 thread->clear_pending_exception(); | |
758 | |
759 for (int i = 0; i < objects->length(); i++) { | |
760 assert(objects->at(i)->is_object(), "invalid debug information"); | |
761 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
762 | |
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763 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 764 oop obj = NULL; |
765 | |
766 if (k->oop_is_instance()) { | |
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767 InstanceKlass* ik = InstanceKlass::cast(k()); |
0 | 768 obj = ik->allocate_instance(CHECK_(false)); |
769 } else if (k->oop_is_typeArray()) { | |
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770 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
0 | 771 assert(sv->field_size() % type2size[ak->element_type()] == 0, "non-integral array length"); |
772 int len = sv->field_size() / type2size[ak->element_type()]; | |
773 obj = ak->allocate(len, CHECK_(false)); | |
774 } else if (k->oop_is_objArray()) { | |
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775 ObjArrayKlass* ak = ObjArrayKlass::cast(k()); |
0 | 776 obj = ak->allocate(sv->field_size(), CHECK_(false)); |
777 } | |
778 | |
779 assert(obj != NULL, "allocation failed"); | |
780 assert(sv->value().is_null(), "redundant reallocation"); | |
781 sv->set_value(obj); | |
782 } | |
783 | |
784 if (pending_exception.not_null()) { | |
785 thread->set_pending_exception(pending_exception(), exception_file, exception_line); | |
786 } | |
787 | |
788 return true; | |
789 } | |
790 | |
791 // This assumes that the fields are stored in ObjectValue in the same order | |
792 // they are yielded by do_nonstatic_fields. | |
793 class FieldReassigner: public FieldClosure { | |
794 frame* _fr; | |
795 RegisterMap* _reg_map; | |
796 ObjectValue* _sv; | |
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797 InstanceKlass* _ik; |
0 | 798 oop _obj; |
799 | |
800 int _i; | |
801 public: | |
802 FieldReassigner(frame* fr, RegisterMap* reg_map, ObjectValue* sv, oop obj) : | |
803 _fr(fr), _reg_map(reg_map), _sv(sv), _obj(obj), _i(0) {} | |
804 | |
805 int i() const { return _i; } | |
806 | |
807 | |
808 void do_field(fieldDescriptor* fd) { | |
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809 intptr_t val; |
0 | 810 StackValue* value = |
811 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(i())); | |
812 int offset = fd->offset(); | |
813 switch (fd->field_type()) { | |
814 case T_OBJECT: case T_ARRAY: | |
815 assert(value->type() == T_OBJECT, "Agreement."); | |
816 _obj->obj_field_put(offset, value->get_obj()()); | |
817 break; | |
818 | |
819 case T_LONG: case T_DOUBLE: { | |
820 assert(value->type() == T_INT, "Agreement."); | |
821 StackValue* low = | |
822 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(++_i)); | |
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823 #ifdef _LP64 |
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824 jlong res = (jlong)low->get_int(); |
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825 #else |
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826 #ifdef SPARC |
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827 // For SPARC we have to swap high and low words. |
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828 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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829 #else |
0 | 830 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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831 #endif //SPARC |
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832 #endif |
0 | 833 _obj->long_field_put(offset, res); |
834 break; | |
835 } | |
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836 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
0 | 837 case T_INT: case T_FLOAT: // 4 bytes. |
838 assert(value->type() == T_INT, "Agreement."); | |
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839 val = value->get_int(); |
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840 _obj->int_field_put(offset, (jint)*((jint*)&val)); |
0 | 841 break; |
842 | |
843 case T_SHORT: case T_CHAR: // 2 bytes | |
844 assert(value->type() == T_INT, "Agreement."); | |
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845 val = value->get_int(); |
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846 _obj->short_field_put(offset, (jshort)*((jint*)&val)); |
0 | 847 break; |
848 | |
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849 case T_BOOLEAN: case T_BYTE: // 1 byte |
0 | 850 assert(value->type() == T_INT, "Agreement."); |
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851 val = value->get_int(); |
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852 _obj->bool_field_put(offset, (jboolean)*((jint*)&val)); |
0 | 853 break; |
854 | |
855 default: | |
856 ShouldNotReachHere(); | |
857 } | |
858 _i++; | |
859 } | |
860 }; | |
861 | |
862 // restore elements of an eliminated type array | |
863 void Deoptimization::reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type) { | |
864 int index = 0; | |
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865 intptr_t val; |
0 | 866 |
867 for (int i = 0; i < sv->field_size(); i++) { | |
868 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
869 switch(type) { | |
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870 case T_LONG: case T_DOUBLE: { |
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871 assert(value->type() == T_INT, "Agreement."); |
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872 StackValue* low = |
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873 StackValue::create_stack_value(fr, reg_map, sv->field_at(++i)); |
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874 #ifdef _LP64 |
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875 jlong res = (jlong)low->get_int(); |
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876 #else |
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877 #ifdef SPARC |
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878 // For SPARC we have to swap high and low words. |
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879 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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880 #else |
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881 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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882 #endif //SPARC |
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883 #endif |
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884 obj->long_at_put(index, res); |
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885 break; |
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886 } |
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887 |
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888 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
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889 case T_INT: case T_FLOAT: // 4 bytes. |
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890 assert(value->type() == T_INT, "Agreement."); |
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891 val = value->get_int(); |
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892 obj->int_at_put(index, (jint)*((jint*)&val)); |
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893 break; |
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894 |
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895 case T_SHORT: case T_CHAR: // 2 bytes |
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896 assert(value->type() == T_INT, "Agreement."); |
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897 val = value->get_int(); |
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898 obj->short_at_put(index, (jshort)*((jint*)&val)); |
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899 break; |
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900 |
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901 case T_BOOLEAN: case T_BYTE: // 1 byte |
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902 assert(value->type() == T_INT, "Agreement."); |
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903 val = value->get_int(); |
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904 obj->bool_at_put(index, (jboolean)*((jint*)&val)); |
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905 break; |
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906 |
0 | 907 default: |
908 ShouldNotReachHere(); | |
909 } | |
910 index++; | |
911 } | |
912 } | |
913 | |
914 | |
915 // restore fields of an eliminated object array | |
916 void Deoptimization::reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj) { | |
917 for (int i = 0; i < sv->field_size(); i++) { | |
918 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
919 assert(value->type() == T_OBJECT, "object element expected"); | |
920 obj->obj_at_put(i, value->get_obj()()); | |
921 } | |
922 } | |
923 | |
924 | |
925 // restore fields of all eliminated objects and arrays | |
926 void Deoptimization::reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects) { | |
927 for (int i = 0; i < objects->length(); i++) { | |
928 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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929 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 930 Handle obj = sv->value(); |
931 assert(obj.not_null(), "reallocation was missed"); | |
932 | |
933 if (k->oop_is_instance()) { | |
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934 InstanceKlass* ik = InstanceKlass::cast(k()); |
0 | 935 FieldReassigner reassign(fr, reg_map, sv, obj()); |
936 ik->do_nonstatic_fields(&reassign); | |
937 } else if (k->oop_is_typeArray()) { | |
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938 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
0 | 939 reassign_type_array_elements(fr, reg_map, sv, (typeArrayOop) obj(), ak->element_type()); |
940 } else if (k->oop_is_objArray()) { | |
941 reassign_object_array_elements(fr, reg_map, sv, (objArrayOop) obj()); | |
942 } | |
943 } | |
944 } | |
945 | |
946 | |
947 // relock objects for which synchronization was eliminated | |
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948 void Deoptimization::relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread) { |
0 | 949 for (int i = 0; i < monitors->length(); i++) { |
83
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950 MonitorInfo* mon_info = monitors->at(i); |
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951 if (mon_info->eliminated()) { |
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952 assert(mon_info->owner() != NULL, "reallocation was missed"); |
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953 Handle obj = Handle(mon_info->owner()); |
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954 markOop mark = obj->mark(); |
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955 if (UseBiasedLocking && mark->has_bias_pattern()) { |
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956 // New allocated objects may have the mark set to anonymously biased. |
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957 // Also the deoptimized method may called methods with synchronization |
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958 // where the thread-local object is bias locked to the current thread. |
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959 assert(mark->is_biased_anonymously() || |
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960 mark->biased_locker() == thread, "should be locked to current thread"); |
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961 // Reset mark word to unbiased prototype. |
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962 markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
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963 obj->set_mark(unbiased_prototype); |
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964 } |
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965 BasicLock* lock = mon_info->lock(); |
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966 ObjectSynchronizer::slow_enter(obj, lock, thread); |
0 | 967 } |
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968 assert(mon_info->owner()->is_locked(), "object must be locked now"); |
0 | 969 } |
970 } | |
971 | |
972 | |
973 #ifndef PRODUCT | |
974 // print information about reallocated objects | |
975 void Deoptimization::print_objects(GrowableArray<ScopeValue*>* objects) { | |
976 fieldDescriptor fd; | |
977 | |
978 for (int i = 0; i < objects->length(); i++) { | |
979 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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980 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
0 | 981 Handle obj = sv->value(); |
982 | |
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983 tty->print(" object <" INTPTR_FORMAT "> of type ", (void *)sv->value()()); |
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984 k->print_value(); |
0 | 985 tty->print(" allocated (%d bytes)", obj->size() * HeapWordSize); |
986 tty->cr(); | |
987 | |
988 if (Verbose) { | |
989 k->oop_print_on(obj(), tty); | |
990 } | |
991 } | |
992 } | |
993 #endif | |
994 #endif // COMPILER2 | |
995 | |
996 vframeArray* Deoptimization::create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk) { | |
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997 Events::log(thread, "DEOPT PACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT, fr.pc(), fr.sp()); |
0 | 998 |
999 #ifndef PRODUCT | |
1000 if (TraceDeoptimization) { | |
1001 ttyLocker ttyl; | |
1002 tty->print("DEOPT PACKING thread " INTPTR_FORMAT " ", thread); | |
1003 fr.print_on(tty); | |
1004 tty->print_cr(" Virtual frames (innermost first):"); | |
1005 for (int index = 0; index < chunk->length(); index++) { | |
1006 compiledVFrame* vf = chunk->at(index); | |
1007 tty->print(" %2d - ", index); | |
1008 vf->print_value(); | |
1009 int bci = chunk->at(index)->raw_bci(); | |
1010 const char* code_name; | |
1011 if (bci == SynchronizationEntryBCI) { | |
1012 code_name = "sync entry"; | |
1013 } else { | |
2142 | 1014 Bytecodes::Code code = vf->method()->code_at(bci); |
0 | 1015 code_name = Bytecodes::name(code); |
1016 } | |
1017 tty->print(" - %s", code_name); | |
1018 tty->print_cr(" @ bci %d ", bci); | |
1019 if (Verbose) { | |
1020 vf->print(); | |
1021 tty->cr(); | |
1022 } | |
1023 } | |
1024 } | |
1025 #endif | |
1026 | |
1027 // Register map for next frame (used for stack crawl). We capture | |
1028 // the state of the deopt'ing frame's caller. Thus if we need to | |
1029 // stuff a C2I adapter we can properly fill in the callee-save | |
1030 // register locations. | |
1031 frame caller = fr.sender(reg_map); | |
1032 int frame_size = caller.sp() - fr.sp(); | |
1033 | |
1034 frame sender = caller; | |
1035 | |
1036 // Since the Java thread being deoptimized will eventually adjust it's own stack, | |
1037 // the vframeArray containing the unpacking information is allocated in the C heap. | |
1038 // For Compiler1, the caller of the deoptimized frame is saved for use by unpack_frames(). | |
1039 vframeArray* array = vframeArray::allocate(thread, frame_size, chunk, reg_map, sender, caller, fr); | |
1040 | |
1041 // Compare the vframeArray to the collected vframes | |
1042 assert(array->structural_compare(thread, chunk), "just checking"); | |
1043 | |
1044 #ifndef PRODUCT | |
1045 if (TraceDeoptimization) { | |
1046 ttyLocker ttyl; | |
1047 tty->print_cr(" Created vframeArray " INTPTR_FORMAT, array); | |
1048 } | |
1049 #endif // PRODUCT | |
1050 | |
1051 return array; | |
1052 } | |
1053 | |
1054 | |
1055 static void collect_monitors(compiledVFrame* cvf, GrowableArray<Handle>* objects_to_revoke) { | |
1056 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); | |
1057 for (int i = 0; i < monitors->length(); i++) { | |
1058 MonitorInfo* mon_info = monitors->at(i); | |
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1059 if (!mon_info->eliminated() && mon_info->owner() != NULL) { |
0 | 1060 objects_to_revoke->append(Handle(mon_info->owner())); |
1061 } | |
1062 } | |
1063 } | |
1064 | |
1065 | |
1066 void Deoptimization::revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map) { | |
1067 if (!UseBiasedLocking) { | |
1068 return; | |
1069 } | |
1070 | |
1071 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
1072 | |
1073 // Unfortunately we don't have a RegisterMap available in most of | |
1074 // the places we want to call this routine so we need to walk the | |
1075 // stack again to update the register map. | |
1076 if (map == NULL || !map->update_map()) { | |
1077 StackFrameStream sfs(thread, true); | |
1078 bool found = false; | |
1079 while (!found && !sfs.is_done()) { | |
1080 frame* cur = sfs.current(); | |
1081 sfs.next(); | |
1082 found = cur->id() == fr.id(); | |
1083 } | |
1084 assert(found, "frame to be deoptimized not found on target thread's stack"); | |
1085 map = sfs.register_map(); | |
1086 } | |
1087 | |
1088 vframe* vf = vframe::new_vframe(&fr, map, thread); | |
1089 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1090 // Revoke monitors' biases in all scopes | |
1091 while (!cvf->is_top()) { | |
1092 collect_monitors(cvf, objects_to_revoke); | |
1093 cvf = compiledVFrame::cast(cvf->sender()); | |
1094 } | |
1095 collect_monitors(cvf, objects_to_revoke); | |
1096 | |
1097 if (SafepointSynchronize::is_at_safepoint()) { | |
1098 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
1099 } else { | |
1100 BiasedLocking::revoke(objects_to_revoke); | |
1101 } | |
1102 } | |
1103 | |
1104 | |
1105 void Deoptimization::revoke_biases_of_monitors(CodeBlob* cb) { | |
1106 if (!UseBiasedLocking) { | |
1107 return; | |
1108 } | |
1109 | |
1110 assert(SafepointSynchronize::is_at_safepoint(), "must only be called from safepoint"); | |
1111 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
1112 for (JavaThread* jt = Threads::first(); jt != NULL ; jt = jt->next()) { | |
1113 if (jt->has_last_Java_frame()) { | |
1114 StackFrameStream sfs(jt, true); | |
1115 while (!sfs.is_done()) { | |
1116 frame* cur = sfs.current(); | |
1117 if (cb->contains(cur->pc())) { | |
1118 vframe* vf = vframe::new_vframe(cur, sfs.register_map(), jt); | |
1119 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1120 // Revoke monitors' biases in all scopes | |
1121 while (!cvf->is_top()) { | |
1122 collect_monitors(cvf, objects_to_revoke); | |
1123 cvf = compiledVFrame::cast(cvf->sender()); | |
1124 } | |
1125 collect_monitors(cvf, objects_to_revoke); | |
1126 } | |
1127 sfs.next(); | |
1128 } | |
1129 } | |
1130 } | |
1131 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
1132 } | |
1133 | |
1134 | |
1135 void Deoptimization::deoptimize_single_frame(JavaThread* thread, frame fr) { | |
1136 assert(fr.can_be_deoptimized(), "checking frame type"); | |
1137 | |
1138 gather_statistics(Reason_constraint, Action_none, Bytecodes::_illegal); | |
1139 | |
1140 // Patch the nmethod so that when execution returns to it we will | |
1141 // deopt the execution state and return to the interpreter. | |
1142 fr.deoptimize(thread); | |
1143 } | |
1144 | |
1145 void Deoptimization::deoptimize(JavaThread* thread, frame fr, RegisterMap *map) { | |
1146 // Deoptimize only if the frame comes from compile code. | |
1147 // Do not deoptimize the frame which is already patched | |
1148 // during the execution of the loops below. | |
1149 if (!fr.is_compiled_frame() || fr.is_deoptimized_frame()) { | |
1150 return; | |
1151 } | |
1152 ResourceMark rm; | |
1153 DeoptimizationMarker dm; | |
1154 if (UseBiasedLocking) { | |
1155 revoke_biases_of_monitors(thread, fr, map); | |
1156 } | |
1157 deoptimize_single_frame(thread, fr); | |
1158 | |
1159 } | |
1160 | |
1161 | |
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1162 void Deoptimization::deoptimize_frame_internal(JavaThread* thread, intptr_t* id) { |
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1163 assert(thread == Thread::current() || SafepointSynchronize::is_at_safepoint(), |
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1164 "can only deoptimize other thread at a safepoint"); |
0 | 1165 // Compute frame and register map based on thread and sp. |
1166 RegisterMap reg_map(thread, UseBiasedLocking); | |
1167 frame fr = thread->last_frame(); | |
1168 while (fr.id() != id) { | |
1169 fr = fr.sender(®_map); | |
1170 } | |
1171 deoptimize(thread, fr, ®_map); | |
1172 } | |
1173 | |
1174 | |
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1175 void Deoptimization::deoptimize_frame(JavaThread* thread, intptr_t* id) { |
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1176 if (thread == Thread::current()) { |
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1177 Deoptimization::deoptimize_frame_internal(thread, id); |
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1178 } else { |
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1179 VM_DeoptimizeFrame deopt(thread, id); |
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1180 VMThread::execute(&deopt); |
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1181 } |
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1182 } |
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1183 |
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1184 |
0 | 1185 // JVMTI PopFrame support |
1186 JRT_LEAF(void, Deoptimization::popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address)) | |
1187 { | |
1188 thread->popframe_preserve_args(in_ByteSize(bytes_to_save), start_address); | |
1189 } | |
1190 JRT_END | |
1191 | |
1192 | |
1692 | 1193 #if defined(COMPILER2) || defined(SHARK) |
0 | 1194 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS) { |
1195 // in case of an unresolved klass entry, load the class. | |
1196 if (constant_pool->tag_at(index).is_unresolved_klass()) { | |
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1197 Klass* tk = constant_pool->klass_at(index, CHECK); |
0 | 1198 return; |
1199 } | |
1200 | |
1201 if (!constant_pool->tag_at(index).is_symbol()) return; | |
1202 | |
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1203 Handle class_loader (THREAD, constant_pool->pool_holder()->class_loader()); |
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1204 Symbol* symbol = constant_pool->symbol_at(index); |
0 | 1205 |
1206 // class name? | |
1207 if (symbol->byte_at(0) != '(') { | |
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1208 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
0 | 1209 SystemDictionary::resolve_or_null(symbol, class_loader, protection_domain, CHECK); |
1210 return; | |
1211 } | |
1212 | |
1213 // then it must be a signature! | |
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1214 ResourceMark rm(THREAD); |
0 | 1215 for (SignatureStream ss(symbol); !ss.is_done(); ss.next()) { |
1216 if (ss.is_object()) { | |
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1217 Symbol* class_name = ss.as_symbol(CHECK); |
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1218 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
0 | 1219 SystemDictionary::resolve_or_null(class_name, class_loader, protection_domain, CHECK); |
1220 } | |
1221 } | |
1222 } | |
1223 | |
1224 | |
1225 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) { | |
1226 EXCEPTION_MARK; | |
1227 load_class_by_index(constant_pool, index, THREAD); | |
1228 if (HAS_PENDING_EXCEPTION) { | |
1229 // Exception happened during classloading. We ignore the exception here, since it | |
1230 // is going to be rethrown since the current activation is going to be deoptimzied and | |
1231 // the interpreter will re-execute the bytecode. | |
1232 CLEAR_PENDING_EXCEPTION; | |
1233 } | |
1234 } | |
1235 | |
1236 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) { | |
1237 HandleMark hm; | |
1238 | |
1239 // uncommon_trap() is called at the beginning of the uncommon trap | |
1240 // handler. Note this fact before we start generating temporary frames | |
1241 // that can confuse an asynchronous stack walker. This counter is | |
1242 // decremented at the end of unpack_frames(). | |
1243 thread->inc_in_deopt_handler(); | |
1244 | |
1245 // We need to update the map if we have biased locking. | |
1246 RegisterMap reg_map(thread, UseBiasedLocking); | |
1247 frame stub_frame = thread->last_frame(); | |
1248 frame fr = stub_frame.sender(®_map); | |
1249 // Make sure the calling nmethod is not getting deoptimized and removed | |
1250 // before we are done with it. | |
1251 nmethodLocker nl(fr.pc()); | |
1252 | |
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1253 // Log a message |
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1254 Events::log(thread, "Uncommon trap: trap_request=" PTR32_FORMAT " fr.pc=" INTPTR_FORMAT, |
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1255 trap_request, fr.pc()); |
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1256 |
0 | 1257 { |
1258 ResourceMark rm; | |
1259 | |
1260 // Revoke biases of any monitors in the frame to ensure we can migrate them | |
1261 revoke_biases_of_monitors(thread, fr, ®_map); | |
1262 | |
1263 DeoptReason reason = trap_request_reason(trap_request); | |
1264 DeoptAction action = trap_request_action(trap_request); | |
1265 jint unloaded_class_index = trap_request_index(trap_request); // CP idx or -1 | |
1266 | |
1267 vframe* vf = vframe::new_vframe(&fr, ®_map, thread); | |
1268 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
1269 | |
1270 nmethod* nm = cvf->code(); | |
1271 | |
1272 ScopeDesc* trap_scope = cvf->scope(); | |
1273 methodHandle trap_method = trap_scope->method(); | |
1274 int trap_bci = trap_scope->bci(); | |
2142 | 1275 Bytecodes::Code trap_bc = trap_method->java_code_at(trap_bci); |
0 | 1276 |
1277 // Record this event in the histogram. | |
1278 gather_statistics(reason, action, trap_bc); | |
1279 | |
1280 // Ensure that we can record deopt. history: | |
1281 bool create_if_missing = ProfileTraps; | |
1282 | |
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1283 MethodData* trap_mdo = |
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1284 get_method_data(thread, trap_method, create_if_missing); |
0 | 1285 |
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1286 // Log a message |
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1287 Events::log_deopt_message(thread, "Uncommon trap: reason=%s action=%s pc=" INTPTR_FORMAT " method=%s @ %d", |
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1288 trap_reason_name(reason), trap_action_name(action), fr.pc(), |
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1289 trap_method->name_and_sig_as_C_string(), trap_bci); |
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1290 |
0 | 1291 // Print a bunch of diagnostics, if requested. |
1292 if (TraceDeoptimization || LogCompilation) { | |
1293 ResourceMark rm; | |
1294 ttyLocker ttyl; | |
1295 char buf[100]; | |
1296 if (xtty != NULL) { | |
1297 xtty->begin_head("uncommon_trap thread='" UINTX_FORMAT"' %s", | |
1298 os::current_thread_id(), | |
1299 format_trap_request(buf, sizeof(buf), trap_request)); | |
1300 nm->log_identity(xtty); | |
1301 } | |
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1302 Symbol* class_name = NULL; |
0 | 1303 bool unresolved = false; |
1304 if (unloaded_class_index >= 0) { | |
1305 constantPoolHandle constants (THREAD, trap_method->constants()); | |
1306 if (constants->tag_at(unloaded_class_index).is_unresolved_klass()) { | |
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1307 class_name = constants->klass_name_at(unloaded_class_index); |
0 | 1308 unresolved = true; |
1309 if (xtty != NULL) | |
1310 xtty->print(" unresolved='1'"); | |
1311 } else if (constants->tag_at(unloaded_class_index).is_symbol()) { | |
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1312 class_name = constants->symbol_at(unloaded_class_index); |
0 | 1313 } |
1314 if (xtty != NULL) | |
1315 xtty->name(class_name); | |
1316 } | |
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1317 if (xtty != NULL && trap_mdo != NULL) { |
0 | 1318 // Dump the relevant MDO state. |
1319 // This is the deopt count for the current reason, any previous | |
1320 // reasons or recompiles seen at this point. | |
1321 int dcnt = trap_mdo->trap_count(reason); | |
1322 if (dcnt != 0) | |
1323 xtty->print(" count='%d'", dcnt); | |
1324 ProfileData* pdata = trap_mdo->bci_to_data(trap_bci); | |
1325 int dos = (pdata == NULL)? 0: pdata->trap_state(); | |
1326 if (dos != 0) { | |
1327 xtty->print(" state='%s'", format_trap_state(buf, sizeof(buf), dos)); | |
1328 if (trap_state_is_recompiled(dos)) { | |
1329 int recnt2 = trap_mdo->overflow_recompile_count(); | |
1330 if (recnt2 != 0) | |
1331 xtty->print(" recompiles2='%d'", recnt2); | |
1332 } | |
1333 } | |
1334 } | |
1335 if (xtty != NULL) { | |
1336 xtty->stamp(); | |
1337 xtty->end_head(); | |
1338 } | |
1339 if (TraceDeoptimization) { // make noise on the tty | |
1340 tty->print("Uncommon trap occurred in"); | |
1341 nm->method()->print_short_name(tty); | |
6843 | 1342 tty->print(" (@" INTPTR_FORMAT ") thread=" UINTX_FORMAT " reason=%s action=%s unloaded_class_index=%d", |
0 | 1343 fr.pc(), |
6843 | 1344 os::current_thread_id(), |
0 | 1345 trap_reason_name(reason), |
1346 trap_action_name(action), | |
1347 unloaded_class_index); | |
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1348 if (class_name != NULL) { |
0 | 1349 tty->print(unresolved ? " unresolved class: " : " symbol: "); |
1350 class_name->print_symbol_on(tty); | |
1351 } | |
1352 tty->cr(); | |
1353 } | |
1354 if (xtty != NULL) { | |
1355 // Log the precise location of the trap. | |
1356 for (ScopeDesc* sd = trap_scope; ; sd = sd->sender()) { | |
1357 xtty->begin_elem("jvms bci='%d'", sd->bci()); | |
1358 xtty->method(sd->method()); | |
1359 xtty->end_elem(); | |
1360 if (sd->is_top()) break; | |
1361 } | |
1362 xtty->tail("uncommon_trap"); | |
1363 } | |
1364 } | |
1365 // (End diagnostic printout.) | |
1366 | |
1367 // Load class if necessary | |
1368 if (unloaded_class_index >= 0) { | |
1369 constantPoolHandle constants(THREAD, trap_method->constants()); | |
1370 load_class_by_index(constants, unloaded_class_index); | |
1371 } | |
1372 | |
1373 // Flush the nmethod if necessary and desirable. | |
1374 // | |
1375 // We need to avoid situations where we are re-flushing the nmethod | |
1376 // because of a hot deoptimization site. Repeated flushes at the same | |
1377 // point need to be detected by the compiler and avoided. If the compiler | |
1378 // cannot avoid them (or has a bug and "refuses" to avoid them), this | |
1379 // module must take measures to avoid an infinite cycle of recompilation | |
1380 // and deoptimization. There are several such measures: | |
1381 // | |
1382 // 1. If a recompilation is ordered a second time at some site X | |
1383 // and for the same reason R, the action is adjusted to 'reinterpret', | |
1384 // to give the interpreter time to exercise the method more thoroughly. | |
1385 // If this happens, the method's overflow_recompile_count is incremented. | |
1386 // | |
1387 // 2. If the compiler fails to reduce the deoptimization rate, then | |
1388 // the method's overflow_recompile_count will begin to exceed the set | |
1389 // limit PerBytecodeRecompilationCutoff. If this happens, the action | |
1390 // is adjusted to 'make_not_compilable', and the method is abandoned | |
1391 // to the interpreter. This is a performance hit for hot methods, | |
1392 // but is better than a disastrous infinite cycle of recompilations. | |
1393 // (Actually, only the method containing the site X is abandoned.) | |
1394 // | |
1395 // 3. In parallel with the previous measures, if the total number of | |
1396 // recompilations of a method exceeds the much larger set limit | |
1397 // PerMethodRecompilationCutoff, the method is abandoned. | |
1398 // This should only happen if the method is very large and has | |
1399 // many "lukewarm" deoptimizations. The code which enforces this | |
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1400 // limit is elsewhere (class nmethod, class Method). |
0 | 1401 // |
1402 // Note that the per-BCI 'is_recompiled' bit gives the compiler one chance | |
1403 // to recompile at each bytecode independently of the per-BCI cutoff. | |
1404 // | |
1405 // The decision to update code is up to the compiler, and is encoded | |
1406 // in the Action_xxx code. If the compiler requests Action_none | |
1407 // no trap state is changed, no compiled code is changed, and the | |
1408 // computation suffers along in the interpreter. | |
1409 // | |
1410 // The other action codes specify various tactics for decompilation | |
1411 // and recompilation. Action_maybe_recompile is the loosest, and | |
1412 // allows the compiled code to stay around until enough traps are seen, | |
1413 // and until the compiler gets around to recompiling the trapping method. | |
1414 // | |
1415 // The other actions cause immediate removal of the present code. | |
1416 | |
1417 bool update_trap_state = true; | |
1418 bool make_not_entrant = false; | |
1419 bool make_not_compilable = false; | |
1783 | 1420 bool reprofile = false; |
0 | 1421 switch (action) { |
1422 case Action_none: | |
1423 // Keep the old code. | |
1424 update_trap_state = false; | |
1425 break; | |
1426 case Action_maybe_recompile: | |
1427 // Do not need to invalidate the present code, but we can | |
1428 // initiate another | |
1429 // Start compiler without (necessarily) invalidating the nmethod. | |
1430 // The system will tolerate the old code, but new code should be | |
1431 // generated when possible. | |
1432 break; | |
1433 case Action_reinterpret: | |
1434 // Go back into the interpreter for a while, and then consider | |
1435 // recompiling form scratch. | |
1436 make_not_entrant = true; | |
1437 // Reset invocation counter for outer most method. | |
1438 // This will allow the interpreter to exercise the bytecodes | |
1439 // for a while before recompiling. | |
1440 // By contrast, Action_make_not_entrant is immediate. | |
1441 // | |
1442 // Note that the compiler will track null_check, null_assert, | |
1443 // range_check, and class_check events and log them as if they | |
1444 // had been traps taken from compiled code. This will update | |
1445 // the MDO trap history so that the next compilation will | |
1446 // properly detect hot trap sites. | |
1783 | 1447 reprofile = true; |
0 | 1448 break; |
1449 case Action_make_not_entrant: | |
1450 // Request immediate recompilation, and get rid of the old code. | |
1451 // Make them not entrant, so next time they are called they get | |
1452 // recompiled. Unloaded classes are loaded now so recompile before next | |
1453 // time they are called. Same for uninitialized. The interpreter will | |
1454 // link the missing class, if any. | |
1455 make_not_entrant = true; | |
1456 break; | |
1457 case Action_make_not_compilable: | |
1458 // Give up on compiling this method at all. | |
1459 make_not_entrant = true; | |
1460 make_not_compilable = true; | |
1461 break; | |
1462 default: | |
1463 ShouldNotReachHere(); | |
1464 } | |
1465 | |
1466 // Setting +ProfileTraps fixes the following, on all platforms: | |
1467 // 4852688: ProfileInterpreter is off by default for ia64. The result is | |
1468 // infinite heroic-opt-uncommon-trap/deopt/recompile cycles, since the | |
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1469 // recompile relies on a MethodData* to record heroic opt failures. |
0 | 1470 |
1471 // Whether the interpreter is producing MDO data or not, we also need | |
1472 // to use the MDO to detect hot deoptimization points and control | |
1473 // aggressive optimization. | |
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1474 bool inc_recompile_count = false; |
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1475 ProfileData* pdata = NULL; |
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1476 if (ProfileTraps && update_trap_state && trap_mdo != NULL) { |
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1477 assert(trap_mdo == get_method_data(thread, trap_method, false), "sanity"); |
0 | 1478 uint this_trap_count = 0; |
1479 bool maybe_prior_trap = false; | |
1480 bool maybe_prior_recompile = false; | |
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1481 pdata = query_update_method_data(trap_mdo, trap_bci, reason, |
0 | 1482 //outputs: |
1483 this_trap_count, | |
1484 maybe_prior_trap, | |
1485 maybe_prior_recompile); | |
1486 // Because the interpreter also counts null, div0, range, and class | |
1487 // checks, these traps from compiled code are double-counted. | |
1488 // This is harmless; it just means that the PerXTrapLimit values | |
1489 // are in effect a little smaller than they look. | |
1490 | |
1491 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
1492 if (per_bc_reason != Reason_none) { | |
1493 // Now take action based on the partially known per-BCI history. | |
1494 if (maybe_prior_trap | |
1495 && this_trap_count >= (uint)PerBytecodeTrapLimit) { | |
1496 // If there are too many traps at this BCI, force a recompile. | |
1497 // This will allow the compiler to see the limit overflow, and | |
1498 // take corrective action, if possible. The compiler generally | |
1499 // does not use the exact PerBytecodeTrapLimit value, but instead | |
1500 // changes its tactics if it sees any traps at all. This provides | |
1501 // a little hysteresis, delaying a recompile until a trap happens | |
1502 // several times. | |
1503 // | |
1504 // Actually, since there is only one bit of counter per BCI, | |
1505 // the possible per-BCI counts are {0,1,(per-method count)}. | |
1506 // This produces accurate results if in fact there is only | |
1507 // one hot trap site, but begins to get fuzzy if there are | |
1508 // many sites. For example, if there are ten sites each | |
1509 // trapping two or more times, they each get the blame for | |
1510 // all of their traps. | |
1511 make_not_entrant = true; | |
1512 } | |
1513 | |
1514 // Detect repeated recompilation at the same BCI, and enforce a limit. | |
1515 if (make_not_entrant && maybe_prior_recompile) { | |
1516 // More than one recompile at this point. | |
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1517 inc_recompile_count = maybe_prior_trap; |
0 | 1518 } |
1519 } else { | |
1520 // For reasons which are not recorded per-bytecode, we simply | |
1521 // force recompiles unconditionally. | |
1522 // (Note that PerMethodRecompilationCutoff is enforced elsewhere.) | |
1523 make_not_entrant = true; | |
1524 } | |
1525 | |
1526 // Go back to the compiler if there are too many traps in this method. | |
1527 if (this_trap_count >= (uint)PerMethodTrapLimit) { | |
1528 // If there are too many traps in this method, force a recompile. | |
1529 // This will allow the compiler to see the limit overflow, and | |
1530 // take corrective action, if possible. | |
1531 // (This condition is an unlikely backstop only, because the | |
1532 // PerBytecodeTrapLimit is more likely to take effect first, | |
1533 // if it is applicable.) | |
1534 make_not_entrant = true; | |
1535 } | |
1536 | |
1537 // Here's more hysteresis: If there has been a recompile at | |
1538 // this trap point already, run the method in the interpreter | |
1539 // for a while to exercise it more thoroughly. | |
1540 if (make_not_entrant && maybe_prior_recompile && maybe_prior_trap) { | |
1783 | 1541 reprofile = true; |
0 | 1542 } |
1543 | |
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1544 } |
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1545 |
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1546 // Take requested actions on the method: |
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1547 |
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1548 // Recompile |
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1549 if (make_not_entrant) { |
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1550 if (!nm->make_not_entrant()) { |
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1551 return; // the call did not change nmethod's state |
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1552 } |
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1553 |
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1554 if (pdata != NULL) { |
0 | 1555 // Record the recompilation event, if any. |
1556 int tstate0 = pdata->trap_state(); | |
1557 int tstate1 = trap_state_set_recompiled(tstate0, true); | |
1558 if (tstate1 != tstate0) | |
1559 pdata->set_trap_state(tstate1); | |
1560 } | |
1561 } | |
1562 | |
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1563 if (inc_recompile_count) { |
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1564 trap_mdo->inc_overflow_recompile_count(); |
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1565 if ((uint)trap_mdo->overflow_recompile_count() > |
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1566 (uint)PerBytecodeRecompilationCutoff) { |
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1567 // Give up on the method containing the bad BCI. |
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1568 if (trap_method() == nm->method()) { |
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1569 make_not_compilable = true; |
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1570 } else { |
7998 | 1571 trap_method->set_not_compilable(CompLevel_full_optimization, true, "overflow_recompile_count > PerBytecodeRecompilationCutoff"); |
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1572 // But give grace to the enclosing nm->method(). |
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1573 } |
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1574 } |
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1575 } |
0 | 1576 |
1783 | 1577 // Reprofile |
1578 if (reprofile) { | |
1579 CompilationPolicy::policy()->reprofile(trap_scope, nm->is_osr_method()); | |
0 | 1580 } |
1581 | |
1582 // Give up compiling | |
1783 | 1583 if (make_not_compilable && !nm->method()->is_not_compilable(CompLevel_full_optimization)) { |
0 | 1584 assert(make_not_entrant, "consistent"); |
1783 | 1585 nm->method()->set_not_compilable(CompLevel_full_optimization); |
0 | 1586 } |
1587 | |
1588 } // Free marked resources | |
1589 | |
1590 } | |
1591 JRT_END | |
1592 | |
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1593 MethodData* |
0 | 1594 Deoptimization::get_method_data(JavaThread* thread, methodHandle m, |
1595 bool create_if_missing) { | |
1596 Thread* THREAD = thread; | |
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1597 MethodData* mdo = m()->method_data(); |
0 | 1598 if (mdo == NULL && create_if_missing && !HAS_PENDING_EXCEPTION) { |
1599 // Build an MDO. Ignore errors like OutOfMemory; | |
1600 // that simply means we won't have an MDO to update. | |
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1601 Method::build_interpreter_method_data(m, THREAD); |
0 | 1602 if (HAS_PENDING_EXCEPTION) { |
1603 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); | |
1604 CLEAR_PENDING_EXCEPTION; | |
1605 } | |
1606 mdo = m()->method_data(); | |
1607 } | |
1608 return mdo; | |
1609 } | |
1610 | |
1611 ProfileData* | |
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1612 Deoptimization::query_update_method_data(MethodData* trap_mdo, |
0 | 1613 int trap_bci, |
1614 Deoptimization::DeoptReason reason, | |
1615 //outputs: | |
1616 uint& ret_this_trap_count, | |
1617 bool& ret_maybe_prior_trap, | |
1618 bool& ret_maybe_prior_recompile) { | |
1619 uint prior_trap_count = trap_mdo->trap_count(reason); | |
1620 uint this_trap_count = trap_mdo->inc_trap_count(reason); | |
1621 | |
1622 // If the runtime cannot find a place to store trap history, | |
1623 // it is estimated based on the general condition of the method. | |
1624 // If the method has ever been recompiled, or has ever incurred | |
1625 // a trap with the present reason , then this BCI is assumed | |
1626 // (pessimistically) to be the culprit. | |
1627 bool maybe_prior_trap = (prior_trap_count != 0); | |
1628 bool maybe_prior_recompile = (trap_mdo->decompile_count() != 0); | |
1629 ProfileData* pdata = NULL; | |
1630 | |
1631 | |
1632 // For reasons which are recorded per bytecode, we check per-BCI data. | |
1633 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
1634 if (per_bc_reason != Reason_none) { | |
1635 // Find the profile data for this BCI. If there isn't one, | |
1636 // try to allocate one from the MDO's set of spares. | |
1637 // This will let us detect a repeated trap at this point. | |
1638 pdata = trap_mdo->allocate_bci_to_data(trap_bci); | |
1639 | |
1640 if (pdata != NULL) { | |
1641 // Query the trap state of this profile datum. | |
1642 int tstate0 = pdata->trap_state(); | |
1643 if (!trap_state_has_reason(tstate0, per_bc_reason)) | |
1644 maybe_prior_trap = false; | |
1645 if (!trap_state_is_recompiled(tstate0)) | |
1646 maybe_prior_recompile = false; | |
1647 | |
1648 // Update the trap state of this profile datum. | |
1649 int tstate1 = tstate0; | |
1650 // Record the reason. | |
1651 tstate1 = trap_state_add_reason(tstate1, per_bc_reason); | |
1652 // Store the updated state on the MDO, for next time. | |
1653 if (tstate1 != tstate0) | |
1654 pdata->set_trap_state(tstate1); | |
1655 } else { | |
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1656 if (LogCompilation && xtty != NULL) { |
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1657 ttyLocker ttyl; |
0 | 1658 // Missing MDP? Leave a small complaint in the log. |
1659 xtty->elem("missing_mdp bci='%d'", trap_bci); | |
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1660 } |
0 | 1661 } |
1662 } | |
1663 | |
1664 // Return results: | |
1665 ret_this_trap_count = this_trap_count; | |
1666 ret_maybe_prior_trap = maybe_prior_trap; | |
1667 ret_maybe_prior_recompile = maybe_prior_recompile; | |
1668 return pdata; | |
1669 } | |
1670 | |
1671 void | |
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1672 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
0 | 1673 ResourceMark rm; |
1674 // Ignored outputs: | |
1675 uint ignore_this_trap_count; | |
1676 bool ignore_maybe_prior_trap; | |
1677 bool ignore_maybe_prior_recompile; | |
1678 query_update_method_data(trap_mdo, trap_bci, | |
1679 (DeoptReason)reason, | |
1680 ignore_this_trap_count, | |
1681 ignore_maybe_prior_trap, | |
1682 ignore_maybe_prior_recompile); | |
1683 } | |
1684 | |
1685 Deoptimization::UnrollBlock* Deoptimization::uncommon_trap(JavaThread* thread, jint trap_request) { | |
1686 | |
1687 // Still in Java no safepoints | |
1688 { | |
1689 // This enters VM and may safepoint | |
1690 uncommon_trap_inner(thread, trap_request); | |
1691 } | |
1692 return fetch_unroll_info_helper(thread); | |
1693 } | |
1694 | |
1695 // Local derived constants. | |
1696 // Further breakdown of DataLayout::trap_state, as promised by DataLayout. | |
1697 const int DS_REASON_MASK = DataLayout::trap_mask >> 1; | |
1698 const int DS_RECOMPILE_BIT = DataLayout::trap_mask - DS_REASON_MASK; | |
1699 | |
1700 //---------------------------trap_state_reason--------------------------------- | |
1701 Deoptimization::DeoptReason | |
1702 Deoptimization::trap_state_reason(int trap_state) { | |
1703 // This assert provides the link between the width of DataLayout::trap_bits | |
1704 // and the encoding of "recorded" reasons. It ensures there are enough | |
1705 // bits to store all needed reasons in the per-BCI MDO profile. | |
1706 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
1707 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1708 trap_state -= recompile_bit; | |
1709 if (trap_state == DS_REASON_MASK) { | |
1710 return Reason_many; | |
1711 } else { | |
1712 assert((int)Reason_none == 0, "state=0 => Reason_none"); | |
1713 return (DeoptReason)trap_state; | |
1714 } | |
1715 } | |
1716 //-------------------------trap_state_has_reason------------------------------- | |
1717 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
1718 assert(reason_is_recorded_per_bytecode((DeoptReason)reason), "valid reason"); | |
1719 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
1720 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1721 trap_state -= recompile_bit; | |
1722 if (trap_state == DS_REASON_MASK) { | |
1723 return -1; // true, unspecifically (bottom of state lattice) | |
1724 } else if (trap_state == reason) { | |
1725 return 1; // true, definitely | |
1726 } else if (trap_state == 0) { | |
1727 return 0; // false, definitely (top of state lattice) | |
1728 } else { | |
1729 return 0; // false, definitely | |
1730 } | |
1731 } | |
1732 //-------------------------trap_state_add_reason------------------------------- | |
1733 int Deoptimization::trap_state_add_reason(int trap_state, int reason) { | |
1734 assert(reason_is_recorded_per_bytecode((DeoptReason)reason) || reason == Reason_many, "valid reason"); | |
1735 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
1736 trap_state -= recompile_bit; | |
1737 if (trap_state == DS_REASON_MASK) { | |
1738 return trap_state + recompile_bit; // already at state lattice bottom | |
1739 } else if (trap_state == reason) { | |
1740 return trap_state + recompile_bit; // the condition is already true | |
1741 } else if (trap_state == 0) { | |
1742 return reason + recompile_bit; // no condition has yet been true | |
1743 } else { | |
1744 return DS_REASON_MASK + recompile_bit; // fall to state lattice bottom | |
1745 } | |
1746 } | |
1747 //-----------------------trap_state_is_recompiled------------------------------ | |
1748 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
1749 return (trap_state & DS_RECOMPILE_BIT) != 0; | |
1750 } | |
1751 //-----------------------trap_state_set_recompiled----------------------------- | |
1752 int Deoptimization::trap_state_set_recompiled(int trap_state, bool z) { | |
1753 if (z) return trap_state | DS_RECOMPILE_BIT; | |
1754 else return trap_state & ~DS_RECOMPILE_BIT; | |
1755 } | |
1756 //---------------------------format_trap_state--------------------------------- | |
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1757 // This is used for debugging and diagnostics, including LogFile output. |
0 | 1758 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, |
1759 int trap_state) { | |
1760 DeoptReason reason = trap_state_reason(trap_state); | |
1761 bool recomp_flag = trap_state_is_recompiled(trap_state); | |
1762 // Re-encode the state from its decoded components. | |
1763 int decoded_state = 0; | |
1764 if (reason_is_recorded_per_bytecode(reason) || reason == Reason_many) | |
1765 decoded_state = trap_state_add_reason(decoded_state, reason); | |
1766 if (recomp_flag) | |
1767 decoded_state = trap_state_set_recompiled(decoded_state, recomp_flag); | |
1768 // If the state re-encodes properly, format it symbolically. | |
1769 // Because this routine is used for debugging and diagnostics, | |
1770 // be robust even if the state is a strange value. | |
1771 size_t len; | |
1772 if (decoded_state != trap_state) { | |
1773 // Random buggy state that doesn't decode?? | |
1774 len = jio_snprintf(buf, buflen, "#%d", trap_state); | |
1775 } else { | |
1776 len = jio_snprintf(buf, buflen, "%s%s", | |
1777 trap_reason_name(reason), | |
1778 recomp_flag ? " recompiled" : ""); | |
1779 } | |
1780 if (len >= buflen) | |
1781 buf[buflen-1] = '\0'; | |
1782 return buf; | |
1783 } | |
1784 | |
1785 | |
1786 //--------------------------------statics-------------------------------------- | |
1787 Deoptimization::DeoptAction Deoptimization::_unloaded_action | |
1788 = Deoptimization::Action_reinterpret; | |
1789 const char* Deoptimization::_trap_reason_name[Reason_LIMIT] = { | |
1790 // Note: Keep this in sync. with enum DeoptReason. | |
1791 "none", | |
1792 "null_check", | |
1793 "null_assert", | |
1794 "range_check", | |
1795 "class_check", | |
1796 "array_check", | |
1797 "intrinsic", | |
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1798 "bimorphic", |
0 | 1799 "unloaded", |
1800 "uninitialized", | |
1801 "unreached", | |
1802 "unhandled", | |
1803 "constraint", | |
1804 "div0_check", | |
1172 | 1805 "age", |
3345 | 1806 "predicate", |
1807 "loop_limit_check" | |
0 | 1808 }; |
1809 const char* Deoptimization::_trap_action_name[Action_LIMIT] = { | |
1810 // Note: Keep this in sync. with enum DeoptAction. | |
1811 "none", | |
1812 "maybe_recompile", | |
1813 "reinterpret", | |
1814 "make_not_entrant", | |
1815 "make_not_compilable" | |
1816 }; | |
1817 | |
1818 const char* Deoptimization::trap_reason_name(int reason) { | |
1819 if (reason == Reason_many) return "many"; | |
1820 if ((uint)reason < Reason_LIMIT) | |
1821 return _trap_reason_name[reason]; | |
1822 static char buf[20]; | |
1823 sprintf(buf, "reason%d", reason); | |
1824 return buf; | |
1825 } | |
1826 const char* Deoptimization::trap_action_name(int action) { | |
1827 if ((uint)action < Action_LIMIT) | |
1828 return _trap_action_name[action]; | |
1829 static char buf[20]; | |
1830 sprintf(buf, "action%d", action); | |
1831 return buf; | |
1832 } | |
1833 | |
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1834 // This is used for debugging and diagnostics, including LogFile output. |
0 | 1835 const char* Deoptimization::format_trap_request(char* buf, size_t buflen, |
1836 int trap_request) { | |
1837 jint unloaded_class_index = trap_request_index(trap_request); | |
1838 const char* reason = trap_reason_name(trap_request_reason(trap_request)); | |
1839 const char* action = trap_action_name(trap_request_action(trap_request)); | |
1840 size_t len; | |
1841 if (unloaded_class_index < 0) { | |
1842 len = jio_snprintf(buf, buflen, "reason='%s' action='%s'", | |
1843 reason, action); | |
1844 } else { | |
1845 len = jio_snprintf(buf, buflen, "reason='%s' action='%s' index='%d'", | |
1846 reason, action, unloaded_class_index); | |
1847 } | |
1848 if (len >= buflen) | |
1849 buf[buflen-1] = '\0'; | |
1850 return buf; | |
1851 } | |
1852 | |
1853 juint Deoptimization::_deoptimization_hist | |
1854 [Deoptimization::Reason_LIMIT] | |
1855 [1 + Deoptimization::Action_LIMIT] | |
1856 [Deoptimization::BC_CASE_LIMIT] | |
1857 = {0}; | |
1858 | |
1859 enum { | |
1860 LSB_BITS = 8, | |
1861 LSB_MASK = right_n_bits(LSB_BITS) | |
1862 }; | |
1863 | |
1864 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
1865 Bytecodes::Code bc) { | |
1866 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
1867 assert(action >= 0 && action < Action_LIMIT, "oob"); | |
1868 _deoptimization_hist[Reason_none][0][0] += 1; // total | |
1869 _deoptimization_hist[reason][0][0] += 1; // per-reason total | |
1870 juint* cases = _deoptimization_hist[reason][1+action]; | |
1871 juint* bc_counter_addr = NULL; | |
1872 juint bc_counter = 0; | |
1873 // Look for an unused counter, or an exact match to this BC. | |
1874 if (bc != Bytecodes::_illegal) { | |
1875 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
1876 juint* counter_addr = &cases[bc_case]; | |
1877 juint counter = *counter_addr; | |
1878 if ((counter == 0 && bc_counter_addr == NULL) | |
1879 || (Bytecodes::Code)(counter & LSB_MASK) == bc) { | |
1880 // this counter is either free or is already devoted to this BC | |
1881 bc_counter_addr = counter_addr; | |
1882 bc_counter = counter | bc; | |
1883 } | |
1884 } | |
1885 } | |
1886 if (bc_counter_addr == NULL) { | |
1887 // Overflow, or no given bytecode. | |
1888 bc_counter_addr = &cases[BC_CASE_LIMIT-1]; | |
1889 bc_counter = (*bc_counter_addr & ~LSB_MASK); // clear LSB | |
1890 } | |
1891 *bc_counter_addr = bc_counter + (1 << LSB_BITS); | |
1892 } | |
1893 | |
1894 jint Deoptimization::total_deoptimization_count() { | |
1895 return _deoptimization_hist[Reason_none][0][0]; | |
1896 } | |
1897 | |
1898 jint Deoptimization::deoptimization_count(DeoptReason reason) { | |
1899 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
1900 return _deoptimization_hist[reason][0][0]; | |
1901 } | |
1902 | |
1903 void Deoptimization::print_statistics() { | |
1904 juint total = total_deoptimization_count(); | |
1905 juint account = total; | |
1906 if (total != 0) { | |
1907 ttyLocker ttyl; | |
1908 if (xtty != NULL) xtty->head("statistics type='deoptimization'"); | |
1909 tty->print_cr("Deoptimization traps recorded:"); | |
1910 #define PRINT_STAT_LINE(name, r) \ | |
1911 tty->print_cr(" %4d (%4.1f%%) %s", (int)(r), ((r) * 100.0) / total, name); | |
1912 PRINT_STAT_LINE("total", total); | |
1913 // For each non-zero entry in the histogram, print the reason, | |
1914 // the action, and (if specifically known) the type of bytecode. | |
1915 for (int reason = 0; reason < Reason_LIMIT; reason++) { | |
1916 for (int action = 0; action < Action_LIMIT; action++) { | |
1917 juint* cases = _deoptimization_hist[reason][1+action]; | |
1918 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
1919 juint counter = cases[bc_case]; | |
1920 if (counter != 0) { | |
1921 char name[1*K]; | |
1922 Bytecodes::Code bc = (Bytecodes::Code)(counter & LSB_MASK); | |
1923 if (bc_case == BC_CASE_LIMIT && (int)bc == 0) | |
1924 bc = Bytecodes::_illegal; | |
1925 sprintf(name, "%s/%s/%s", | |
1926 trap_reason_name(reason), | |
1927 trap_action_name(action), | |
1928 Bytecodes::is_defined(bc)? Bytecodes::name(bc): "other"); | |
1929 juint r = counter >> LSB_BITS; | |
1930 tty->print_cr(" %40s: " UINT32_FORMAT " (%.1f%%)", name, r, (r * 100.0) / total); | |
1931 account -= r; | |
1932 } | |
1933 } | |
1934 } | |
1935 } | |
1936 if (account != 0) { | |
1937 PRINT_STAT_LINE("unaccounted", account); | |
1938 } | |
1939 #undef PRINT_STAT_LINE | |
1940 if (xtty != NULL) xtty->tail("statistics"); | |
1941 } | |
1942 } | |
1692 | 1943 #else // COMPILER2 || SHARK |
0 | 1944 |
1945 | |
1946 // Stubs for C1 only system. | |
1947 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
1948 return false; | |
1949 } | |
1950 | |
1951 const char* Deoptimization::trap_reason_name(int reason) { | |
1952 return "unknown"; | |
1953 } | |
1954 | |
1955 void Deoptimization::print_statistics() { | |
1956 // no output | |
1957 } | |
1958 | |
1959 void | |
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1960 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
0 | 1961 // no udpate |
1962 } | |
1963 | |
1964 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
1965 return 0; | |
1966 } | |
1967 | |
1968 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
1969 Bytecodes::Code bc) { | |
1970 // no update | |
1971 } | |
1972 | |
1973 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
1974 int trap_state) { | |
1975 jio_snprintf(buf, buflen, "#%d", trap_state); | |
1976 return buf; | |
1977 } | |
1978 | |
1692 | 1979 #endif // COMPILER2 || SHARK |