Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.cpp @ 17980:0bf37f737702
8032410: compiler/uncommontrap/TestStackBangRbp.java times out on Solaris-Sparc V9
Summary: make compiled code bang the stack by the worst case size of the interpreter frame at deoptimization points.
Reviewed-by: twisti, kvn
| author | roland |
|---|---|
| date | Tue, 01 Apr 2014 09:36:49 +0200 |
| parents | 78bbf4d43a14 |
| children | 52b4284cb496 e0c6fadce66e |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "code/debugInfoRec.hpp" | |
| 28 #include "code/nmethod.hpp" | |
| 29 #include "code/pcDesc.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "interpreter/bytecode.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/oopMapCache.hpp" | |
| 34 #include "memory/allocation.inline.hpp" | |
| 35 #include "memory/oopFactory.hpp" | |
| 36 #include "memory/resourceArea.hpp" | |
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37 #include "oops/method.hpp" |
| 1972 | 38 #include "oops/oop.inline.hpp" |
| 39 #include "prims/jvmtiThreadState.hpp" | |
| 40 #include "runtime/biasedLocking.hpp" | |
| 41 #include "runtime/compilationPolicy.hpp" | |
| 42 #include "runtime/deoptimization.hpp" | |
| 43 #include "runtime/interfaceSupport.hpp" | |
| 44 #include "runtime/sharedRuntime.hpp" | |
| 45 #include "runtime/signature.hpp" | |
| 46 #include "runtime/stubRoutines.hpp" | |
| 47 #include "runtime/thread.hpp" | |
| 48 #include "runtime/vframe.hpp" | |
| 49 #include "runtime/vframeArray.hpp" | |
| 50 #include "runtime/vframe_hp.hpp" | |
| 51 #include "utilities/events.hpp" | |
| 52 #include "utilities/xmlstream.hpp" | |
| 53 #ifdef TARGET_ARCH_x86 | |
| 54 # include "vmreg_x86.inline.hpp" | |
| 55 #endif | |
| 56 #ifdef TARGET_ARCH_sparc | |
| 57 # include "vmreg_sparc.inline.hpp" | |
| 58 #endif | |
| 59 #ifdef TARGET_ARCH_zero | |
| 60 # include "vmreg_zero.inline.hpp" | |
| 61 #endif | |
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62 #ifdef TARGET_ARCH_arm |
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63 # include "vmreg_arm.inline.hpp" |
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64 #endif |
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65 #ifdef TARGET_ARCH_ppc |
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66 # include "vmreg_ppc.inline.hpp" |
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67 #endif |
| 1972 | 68 #ifdef COMPILER2 |
| 69 #ifdef TARGET_ARCH_MODEL_x86_32 | |
| 70 # include "adfiles/ad_x86_32.hpp" | |
| 71 #endif | |
| 72 #ifdef TARGET_ARCH_MODEL_x86_64 | |
| 73 # include "adfiles/ad_x86_64.hpp" | |
| 74 #endif | |
| 75 #ifdef TARGET_ARCH_MODEL_sparc | |
| 76 # include "adfiles/ad_sparc.hpp" | |
| 77 #endif | |
| 78 #ifdef TARGET_ARCH_MODEL_zero | |
| 79 # include "adfiles/ad_zero.hpp" | |
| 80 #endif | |
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81 #ifdef TARGET_ARCH_MODEL_arm |
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82 # include "adfiles/ad_arm.hpp" |
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83 #endif |
| 14391 | 84 #ifdef TARGET_ARCH_MODEL_ppc_32 |
| 85 # include "adfiles/ad_ppc_32.hpp" | |
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86 #endif |
| 14391 | 87 #ifdef TARGET_ARCH_MODEL_ppc_64 |
| 88 # include "adfiles/ad_ppc_64.hpp" | |
| 1972 | 89 #endif |
| 14391 | 90 #endif // COMPILER2 |
| 0 | 91 |
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92 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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93 |
| 0 | 94 bool DeoptimizationMarker::_is_active = false; |
| 95 | |
| 96 Deoptimization::UnrollBlock::UnrollBlock(int size_of_deoptimized_frame, | |
| 97 int caller_adjustment, | |
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98 int caller_actual_parameters, |
| 0 | 99 int number_of_frames, |
| 100 intptr_t* frame_sizes, | |
| 101 address* frame_pcs, | |
| 102 BasicType return_type) { | |
| 103 _size_of_deoptimized_frame = size_of_deoptimized_frame; | |
| 104 _caller_adjustment = caller_adjustment; | |
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105 _caller_actual_parameters = caller_actual_parameters; |
| 0 | 106 _number_of_frames = number_of_frames; |
| 107 _frame_sizes = frame_sizes; | |
| 108 _frame_pcs = frame_pcs; | |
| 6197 | 109 _register_block = NEW_C_HEAP_ARRAY(intptr_t, RegisterMap::reg_count * 2, mtCompiler); |
| 0 | 110 _return_type = return_type; |
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111 _initial_info = 0; |
| 0 | 112 // PD (x86 only) |
| 113 _counter_temp = 0; | |
| 114 _unpack_kind = 0; | |
| 115 _sender_sp_temp = 0; | |
| 116 | |
| 117 _total_frame_sizes = size_of_frames(); | |
| 118 } | |
| 119 | |
| 120 | |
| 121 Deoptimization::UnrollBlock::~UnrollBlock() { | |
| 6197 | 122 FREE_C_HEAP_ARRAY(intptr_t, _frame_sizes, mtCompiler); |
| 123 FREE_C_HEAP_ARRAY(intptr_t, _frame_pcs, mtCompiler); | |
| 124 FREE_C_HEAP_ARRAY(intptr_t, _register_block, mtCompiler); | |
| 0 | 125 } |
| 126 | |
| 127 | |
| 128 intptr_t* Deoptimization::UnrollBlock::value_addr_at(int register_number) const { | |
| 129 assert(register_number < RegisterMap::reg_count, "checking register number"); | |
| 130 return &_register_block[register_number * 2]; | |
| 131 } | |
| 132 | |
| 133 | |
| 134 | |
| 135 int Deoptimization::UnrollBlock::size_of_frames() const { | |
| 136 // Acount first for the adjustment of the initial frame | |
| 137 int result = _caller_adjustment; | |
| 138 for (int index = 0; index < number_of_frames(); index++) { | |
| 139 result += frame_sizes()[index]; | |
| 140 } | |
| 141 return result; | |
| 142 } | |
| 143 | |
| 144 | |
| 145 void Deoptimization::UnrollBlock::print() { | |
| 146 ttyLocker ttyl; | |
| 147 tty->print_cr("UnrollBlock"); | |
| 148 tty->print_cr(" size_of_deoptimized_frame = %d", _size_of_deoptimized_frame); | |
| 149 tty->print( " frame_sizes: "); | |
| 150 for (int index = 0; index < number_of_frames(); index++) { | |
| 151 tty->print("%d ", frame_sizes()[index]); | |
| 152 } | |
| 153 tty->cr(); | |
| 154 } | |
| 155 | |
| 156 | |
| 157 // In order to make fetch_unroll_info work properly with escape | |
| 158 // analysis, The method was changed from JRT_LEAF to JRT_BLOCK_ENTRY and | |
| 159 // ResetNoHandleMark and HandleMark were removed from it. The actual reallocation | |
| 160 // of previously eliminated objects occurs in realloc_objects, which is | |
| 161 // called from the method fetch_unroll_info_helper below. | |
| 162 JRT_BLOCK_ENTRY(Deoptimization::UnrollBlock*, Deoptimization::fetch_unroll_info(JavaThread* thread)) | |
| 163 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
| 164 // but makes the entry a little slower. There is however a little dance we have to | |
| 165 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
| 166 | |
| 167 // fetch_unroll_info() is called at the beginning of the deoptimization | |
| 168 // handler. Note this fact before we start generating temporary frames | |
| 169 // that can confuse an asynchronous stack walker. This counter is | |
| 170 // decremented at the end of unpack_frames(). | |
| 171 thread->inc_in_deopt_handler(); | |
| 172 | |
| 173 return fetch_unroll_info_helper(thread); | |
| 174 JRT_END | |
| 175 | |
| 176 | |
| 177 // This is factored, since it is both called from a JRT_LEAF (deoptimization) and a JRT_ENTRY (uncommon_trap) | |
| 178 Deoptimization::UnrollBlock* Deoptimization::fetch_unroll_info_helper(JavaThread* thread) { | |
| 179 | |
| 180 // Note: there is a safepoint safety issue here. No matter whether we enter | |
| 181 // via vanilla deopt or uncommon trap we MUST NOT stop at a safepoint once | |
| 182 // the vframeArray is created. | |
| 183 // | |
| 184 | |
| 185 // Allocate our special deoptimization ResourceMark | |
| 186 DeoptResourceMark* dmark = new DeoptResourceMark(thread); | |
| 187 assert(thread->deopt_mark() == NULL, "Pending deopt!"); | |
| 188 thread->set_deopt_mark(dmark); | |
| 189 | |
| 190 frame stub_frame = thread->last_frame(); // Makes stack walkable as side effect | |
| 191 RegisterMap map(thread, true); | |
| 192 RegisterMap dummy_map(thread, false); | |
| 193 // Now get the deoptee with a valid map | |
| 194 frame deoptee = stub_frame.sender(&map); | |
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195 // Set the deoptee nmethod |
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196 assert(thread->deopt_nmethod() == NULL, "Pending deopt!"); |
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197 thread->set_deopt_nmethod(deoptee.cb()->as_nmethod_or_null()); |
| 0 | 198 |
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199 if (VerifyStack) { |
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200 thread->validate_frame_layout(); |
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201 } |
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202 |
| 0 | 203 // Create a growable array of VFrames where each VFrame represents an inlined |
| 204 // Java frame. This storage is allocated with the usual system arena. | |
| 205 assert(deoptee.is_compiled_frame(), "Wrong frame type"); | |
| 206 GrowableArray<compiledVFrame*>* chunk = new GrowableArray<compiledVFrame*>(10); | |
| 207 vframe* vf = vframe::new_vframe(&deoptee, &map, thread); | |
| 208 while (!vf->is_top()) { | |
| 209 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
| 210 chunk->push(compiledVFrame::cast(vf)); | |
| 211 vf = vf->sender(); | |
| 212 } | |
| 213 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
| 214 chunk->push(compiledVFrame::cast(vf)); | |
| 215 | |
| 216 #ifdef COMPILER2 | |
| 217 // Reallocate the non-escaping objects and restore their fields. Then | |
| 218 // relock objects if synchronization on them was eliminated. | |
| 4777 | 219 if (DoEscapeAnalysis || EliminateNestedLocks) { |
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220 if (EliminateAllocations) { |
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221 assert (chunk->at(0)->scope() != NULL,"expect only compiled java frames"); |
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222 GrowableArray<ScopeValue*>* objects = chunk->at(0)->scope()->objects(); |
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223 |
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224 // The flag return_oop() indicates call sites which return oop |
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225 // in compiled code. Such sites include java method calls, |
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226 // runtime calls (for example, used to allocate new objects/arrays |
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227 // on slow code path) and any other calls generated in compiled code. |
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228 // It is not guaranteed that we can get such information here only |
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229 // by analyzing bytecode in deoptimized frames. This is why this flag |
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230 // is set during method compilation (see Compile::Process_OopMap_Node()). |
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231 bool save_oop_result = chunk->at(0)->scope()->return_oop(); |
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232 Handle return_value; |
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233 if (save_oop_result) { |
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234 // Reallocation may trigger GC. If deoptimization happened on return from |
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235 // call which returns oop we need to save it since it is not in oopmap. |
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236 oop result = deoptee.saved_oop_result(&map); |
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237 assert(result == NULL || result->is_oop(), "must be oop"); |
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238 return_value = Handle(thread, result); |
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239 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); |
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240 if (TraceDeoptimization) { |
| 6843 | 241 ttyLocker ttyl; |
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242 tty->print_cr("SAVED OOP RESULT " INTPTR_FORMAT " in thread " INTPTR_FORMAT, (void *)result, thread); |
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243 } |
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244 } |
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245 bool reallocated = false; |
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246 if (objects != NULL) { |
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247 JRT_BLOCK |
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248 reallocated = realloc_objects(thread, &deoptee, objects, THREAD); |
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249 JRT_END |
| 0 | 250 } |
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251 if (reallocated) { |
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252 reassign_fields(&deoptee, &map, objects); |
| 0 | 253 #ifndef PRODUCT |
| 254 if (TraceDeoptimization) { | |
| 255 ttyLocker ttyl; | |
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256 tty->print_cr("REALLOC OBJECTS in thread " INTPTR_FORMAT, thread); |
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257 print_objects(objects); |
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258 } |
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259 #endif |
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260 } |
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261 if (save_oop_result) { |
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262 // Restore result. |
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263 deoptee.set_saved_oop_result(&map, return_value()); |
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264 } |
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265 } |
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266 if (EliminateLocks) { |
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267 #ifndef PRODUCT |
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268 bool first = true; |
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269 #endif |
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270 for (int i = 0; i < chunk->length(); i++) { |
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271 compiledVFrame* cvf = chunk->at(i); |
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272 assert (cvf->scope() != NULL,"expect only compiled java frames"); |
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273 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); |
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274 if (monitors->is_nonempty()) { |
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275 relock_objects(monitors, thread); |
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276 #ifndef PRODUCT |
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277 if (TraceDeoptimization) { |
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278 ttyLocker ttyl; |
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279 for (int j = 0; j < monitors->length(); j++) { |
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280 MonitorInfo* mi = monitors->at(j); |
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281 if (mi->eliminated()) { |
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282 if (first) { |
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283 first = false; |
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284 tty->print_cr("RELOCK OBJECTS in thread " INTPTR_FORMAT, thread); |
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285 } |
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286 tty->print_cr(" object <" INTPTR_FORMAT "> locked", (void *)mi->owner()); |
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287 } |
| 0 | 288 } |
| 289 } | |
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290 #endif |
| 0 | 291 } |
| 292 } | |
| 293 } | |
| 294 } | |
| 295 #endif // COMPILER2 | |
| 296 // Ensure that no safepoint is taken after pointers have been stored | |
| 297 // in fields of rematerialized objects. If a safepoint occurs from here on | |
| 298 // out the java state residing in the vframeArray will be missed. | |
| 299 No_Safepoint_Verifier no_safepoint; | |
| 300 | |
| 301 vframeArray* array = create_vframeArray(thread, deoptee, &map, chunk); | |
| 302 | |
| 303 assert(thread->vframe_array_head() == NULL, "Pending deopt!");; | |
| 304 thread->set_vframe_array_head(array); | |
| 305 | |
| 306 // Now that the vframeArray has been created if we have any deferred local writes | |
| 307 // added by jvmti then we can free up that structure as the data is now in the | |
| 308 // vframeArray | |
| 309 | |
| 310 if (thread->deferred_locals() != NULL) { | |
| 311 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread->deferred_locals(); | |
| 312 int i = 0; | |
| 313 do { | |
| 314 // Because of inlining we could have multiple vframes for a single frame | |
| 315 // and several of the vframes could have deferred writes. Find them all. | |
| 316 if (list->at(i)->id() == array->original().id()) { | |
| 317 jvmtiDeferredLocalVariableSet* dlv = list->at(i); | |
| 318 list->remove_at(i); | |
| 319 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 320 delete dlv; | |
| 321 } else { | |
| 322 i++; | |
| 323 } | |
| 324 } while ( i < list->length() ); | |
| 325 if (list->length() == 0) { | |
| 326 thread->set_deferred_locals(NULL); | |
| 327 // free the list and elements back to C heap. | |
| 328 delete list; | |
| 329 } | |
| 330 | |
| 331 } | |
| 332 | |
| 1692 | 333 #ifndef SHARK |
| 0 | 334 // Compute the caller frame based on the sender sp of stub_frame and stored frame sizes info. |
| 335 CodeBlob* cb = stub_frame.cb(); | |
| 336 // Verify we have the right vframeArray | |
| 337 assert(cb->frame_size() >= 0, "Unexpected frame size"); | |
| 338 intptr_t* unpack_sp = stub_frame.sp() + cb->frame_size(); | |
| 339 | |
| 1204 | 340 // If the deopt call site is a MethodHandle invoke call site we have |
| 341 // to adjust the unpack_sp. | |
| 342 nmethod* deoptee_nm = deoptee.cb()->as_nmethod_or_null(); | |
| 343 if (deoptee_nm != NULL && deoptee_nm->is_method_handle_return(deoptee.pc())) | |
| 344 unpack_sp = deoptee.unextended_sp(); | |
| 345 | |
| 0 | 346 #ifdef ASSERT |
| 347 assert(cb->is_deoptimization_stub() || cb->is_uncommon_trap_stub(), "just checking"); | |
| 348 #endif | |
| 1692 | 349 #else |
| 350 intptr_t* unpack_sp = stub_frame.sender(&dummy_map).unextended_sp(); | |
| 351 #endif // !SHARK | |
| 352 | |
| 0 | 353 // This is a guarantee instead of an assert because if vframe doesn't match |
| 354 // we will unpack the wrong deoptimized frame and wind up in strange places | |
| 355 // where it will be very difficult to figure out what went wrong. Better | |
| 356 // to die an early death here than some very obscure death later when the | |
| 357 // trail is cold. | |
| 358 // Note: on ia64 this guarantee can be fooled by frames with no memory stack | |
| 359 // in that it will fail to detect a problem when there is one. This needs | |
| 360 // more work in tiger timeframe. | |
| 361 guarantee(array->unextended_sp() == unpack_sp, "vframe_array_head must contain the vframeArray to unpack"); | |
| 362 | |
| 363 int number_of_frames = array->frames(); | |
| 364 | |
| 365 // Compute the vframes' sizes. Note that frame_sizes[] entries are ordered from outermost to innermost | |
| 366 // virtual activation, which is the reverse of the elements in the vframes array. | |
| 6197 | 367 intptr_t* frame_sizes = NEW_C_HEAP_ARRAY(intptr_t, number_of_frames, mtCompiler); |
| 0 | 368 // +1 because we always have an interpreter return address for the final slot. |
| 6197 | 369 address* frame_pcs = NEW_C_HEAP_ARRAY(address, number_of_frames + 1, mtCompiler); |
| 0 | 370 int popframe_extra_args = 0; |
| 371 // Create an interpreter return address for the stub to use as its return | |
| 372 // address so the skeletal frames are perfectly walkable | |
| 373 frame_pcs[number_of_frames] = Interpreter::deopt_entry(vtos, 0); | |
| 374 | |
| 375 // PopFrame requires that the preserved incoming arguments from the recently-popped topmost | |
| 376 // activation be put back on the expression stack of the caller for reexecution | |
| 377 if (JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) { | |
| 378 popframe_extra_args = in_words(thread->popframe_preserved_args_size_in_words()); | |
| 379 } | |
| 380 | |
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381 // Find the current pc for sender of the deoptee. Since the sender may have been deoptimized |
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382 // itself since the deoptee vframeArray was created we must get a fresh value of the pc rather |
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383 // than simply use array->sender.pc(). This requires us to walk the current set of frames |
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384 // |
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385 frame deopt_sender = stub_frame.sender(&dummy_map); // First is the deoptee frame |
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386 deopt_sender = deopt_sender.sender(&dummy_map); // Now deoptee caller |
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387 |
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388 // It's possible that the number of paramters at the call site is |
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389 // different than number of arguments in the callee when method |
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390 // handles are used. If the caller is interpreted get the real |
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391 // value so that the proper amount of space can be added to it's |
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392 // frame. |
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393 bool caller_was_method_handle = false; |
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394 if (deopt_sender.is_interpreted_frame()) { |
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395 methodHandle method = deopt_sender.interpreter_frame_method(); |
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396 Bytecode_invoke cur = Bytecode_invoke_check(method, deopt_sender.interpreter_frame_bci()); |
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397 if (cur.is_invokedynamic() || cur.is_invokehandle()) { |
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398 // Method handle invokes may involve fairly arbitrary chains of |
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399 // calls so it's impossible to know how much actual space the |
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400 // caller has for locals. |
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401 caller_was_method_handle = true; |
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402 } |
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403 } |
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404 |
| 0 | 405 // |
| 406 // frame_sizes/frame_pcs[0] oldest frame (int or c2i) | |
| 407 // frame_sizes/frame_pcs[1] next oldest frame (int) | |
| 408 // frame_sizes/frame_pcs[n] youngest frame (int) | |
| 409 // | |
| 410 // Now a pc in frame_pcs is actually the return address to the frame's caller (a frame | |
| 411 // owns the space for the return address to it's caller). Confusing ain't it. | |
| 412 // | |
| 413 // The vframe array can address vframes with indices running from | |
| 414 // 0.._frames-1. Index 0 is the youngest frame and _frame - 1 is the oldest (root) frame. | |
| 415 // When we create the skeletal frames we need the oldest frame to be in the zero slot | |
| 416 // in the frame_sizes/frame_pcs so the assembly code can do a trivial walk. | |
| 417 // so things look a little strange in this loop. | |
| 418 // | |
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419 int callee_parameters = 0; |
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420 int callee_locals = 0; |
| 0 | 421 for (int index = 0; index < array->frames(); index++ ) { |
| 422 // frame[number_of_frames - 1 ] = on_stack_size(youngest) | |
| 423 // frame[number_of_frames - 2 ] = on_stack_size(sender(youngest)) | |
| 424 // frame[number_of_frames - 3 ] = on_stack_size(sender(sender(youngest))) | |
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425 frame_sizes[number_of_frames - 1 - index] = BytesPerWord * array->element(index)->on_stack_size(callee_parameters, |
| 0 | 426 callee_locals, |
| 427 index == 0, | |
| 428 popframe_extra_args); | |
| 429 // This pc doesn't have to be perfect just good enough to identify the frame | |
| 430 // as interpreted so the skeleton frame will be walkable | |
| 431 // The correct pc will be set when the skeleton frame is completely filled out | |
| 432 // The final pc we store in the loop is wrong and will be overwritten below | |
| 433 frame_pcs[number_of_frames - 1 - index ] = Interpreter::deopt_entry(vtos, 0) - frame::pc_return_offset; | |
| 434 | |
| 435 callee_parameters = array->element(index)->method()->size_of_parameters(); | |
| 436 callee_locals = array->element(index)->method()->max_locals(); | |
| 437 popframe_extra_args = 0; | |
| 438 } | |
| 439 | |
| 440 // Compute whether the root vframe returns a float or double value. | |
| 441 BasicType return_type; | |
| 442 { | |
| 443 HandleMark hm; | |
| 444 methodHandle method(thread, array->element(0)->method()); | |
| 2142 | 445 Bytecode_invoke invoke = Bytecode_invoke_check(method, array->element(0)->bci()); |
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446 return_type = invoke.is_valid() ? invoke.result_type() : T_ILLEGAL; |
| 0 | 447 } |
| 448 | |
| 449 // Compute information for handling adapters and adjusting the frame size of the caller. | |
| 450 int caller_adjustment = 0; | |
| 451 | |
| 452 // Compute the amount the oldest interpreter frame will have to adjust | |
| 453 // its caller's stack by. If the caller is a compiled frame then | |
| 454 // we pretend that the callee has no parameters so that the | |
| 455 // extension counts for the full amount of locals and not just | |
| 456 // locals-parms. This is because without a c2i adapter the parm | |
| 457 // area as created by the compiled frame will not be usable by | |
| 458 // the interpreter. (Depending on the calling convention there | |
| 459 // may not even be enough space). | |
| 460 | |
| 461 // QQQ I'd rather see this pushed down into last_frame_adjust | |
| 462 // and have it take the sender (aka caller). | |
| 463 | |
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464 if (deopt_sender.is_compiled_frame() || caller_was_method_handle) { |
| 0 | 465 caller_adjustment = last_frame_adjust(0, callee_locals); |
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466 } else if (callee_locals > callee_parameters) { |
| 0 | 467 // The caller frame may need extending to accommodate |
| 468 // non-parameter locals of the first unpacked interpreted frame. | |
| 469 // Compute that adjustment. | |
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470 caller_adjustment = last_frame_adjust(callee_parameters, callee_locals); |
| 0 | 471 } |
| 472 | |
| 473 // If the sender is deoptimized the we must retrieve the address of the handler | |
| 474 // since the frame will "magically" show the original pc before the deopt | |
| 475 // and we'd undo the deopt. | |
| 476 | |
| 477 frame_pcs[0] = deopt_sender.raw_pc(); | |
| 478 | |
| 1692 | 479 #ifndef SHARK |
| 0 | 480 assert(CodeCache::find_blob_unsafe(frame_pcs[0]) != NULL, "bad pc"); |
| 1692 | 481 #endif // SHARK |
| 0 | 482 |
| 483 UnrollBlock* info = new UnrollBlock(array->frame_size() * BytesPerWord, | |
| 484 caller_adjustment * BytesPerWord, | |
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485 caller_was_method_handle ? 0 : callee_parameters, |
| 0 | 486 number_of_frames, |
| 487 frame_sizes, | |
| 488 frame_pcs, | |
| 489 return_type); | |
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490 // On some platforms, we need a way to pass some platform dependent |
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491 // information to the unpacking code so the skeletal frames come out |
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492 // correct (initial fp value, unextended sp, ...) |
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493 info->set_initial_info((intptr_t) array->sender().initial_deoptimization_info()); |
| 0 | 494 |
| 495 if (array->frames() > 1) { | |
| 496 if (VerifyStack && TraceDeoptimization) { | |
| 6843 | 497 ttyLocker ttyl; |
| 0 | 498 tty->print_cr("Deoptimizing method containing inlining"); |
| 499 } | |
| 500 } | |
| 501 | |
| 502 array->set_unroll_block(info); | |
| 503 return info; | |
| 504 } | |
| 505 | |
| 506 // Called to cleanup deoptimization data structures in normal case | |
| 507 // after unpacking to stack and when stack overflow error occurs | |
| 508 void Deoptimization::cleanup_deopt_info(JavaThread *thread, | |
| 509 vframeArray *array) { | |
| 510 | |
| 511 // Get array if coming from exception | |
| 512 if (array == NULL) { | |
| 513 array = thread->vframe_array_head(); | |
| 514 } | |
| 515 thread->set_vframe_array_head(NULL); | |
| 516 | |
| 517 // Free the previous UnrollBlock | |
| 518 vframeArray* old_array = thread->vframe_array_last(); | |
| 519 thread->set_vframe_array_last(array); | |
| 520 | |
| 521 if (old_array != NULL) { | |
| 522 UnrollBlock* old_info = old_array->unroll_block(); | |
| 523 old_array->set_unroll_block(NULL); | |
| 524 delete old_info; | |
| 525 delete old_array; | |
| 526 } | |
| 527 | |
| 528 // Deallocate any resource creating in this routine and any ResourceObjs allocated | |
| 529 // inside the vframeArray (StackValueCollections) | |
| 530 | |
| 531 delete thread->deopt_mark(); | |
| 532 thread->set_deopt_mark(NULL); | |
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533 thread->set_deopt_nmethod(NULL); |
| 0 | 534 |
| 535 | |
| 536 if (JvmtiExport::can_pop_frame()) { | |
| 537 #ifndef CC_INTERP | |
| 538 // Regardless of whether we entered this routine with the pending | |
| 539 // popframe condition bit set, we should always clear it now | |
| 540 thread->clear_popframe_condition(); | |
| 541 #else | |
| 542 // C++ interpeter will clear has_pending_popframe when it enters | |
| 543 // with method_resume. For deopt_resume2 we clear it now. | |
| 544 if (thread->popframe_forcing_deopt_reexecution()) | |
| 545 thread->clear_popframe_condition(); | |
| 546 #endif /* CC_INTERP */ | |
| 547 } | |
| 548 | |
| 549 // unpack_frames() is called at the end of the deoptimization handler | |
| 550 // and (in C2) at the end of the uncommon trap handler. Note this fact | |
| 551 // so that an asynchronous stack walker can work again. This counter is | |
| 552 // incremented at the beginning of fetch_unroll_info() and (in C2) at | |
| 553 // the beginning of uncommon_trap(). | |
| 554 thread->dec_in_deopt_handler(); | |
| 555 } | |
| 556 | |
| 557 | |
| 558 // Return BasicType of value being returned | |
| 559 JRT_LEAF(BasicType, Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)) | |
| 560 | |
| 561 // We are already active int he special DeoptResourceMark any ResourceObj's we | |
| 562 // allocate will be freed at the end of the routine. | |
| 563 | |
| 564 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
| 565 // but makes the entry a little slower. There is however a little dance we have to | |
| 566 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
| 567 ResetNoHandleMark rnhm; // No-op in release/product versions | |
| 568 HandleMark hm; | |
| 569 | |
| 570 frame stub_frame = thread->last_frame(); | |
| 571 | |
| 572 // Since the frame to unpack is the top frame of this thread, the vframe_array_head | |
| 573 // must point to the vframeArray for the unpack frame. | |
| 574 vframeArray* array = thread->vframe_array_head(); | |
| 575 | |
| 576 #ifndef PRODUCT | |
| 577 if (TraceDeoptimization) { | |
| 6843 | 578 ttyLocker ttyl; |
| 0 | 579 tty->print_cr("DEOPT UNPACKING thread " INTPTR_FORMAT " vframeArray " INTPTR_FORMAT " mode %d", thread, array, exec_mode); |
| 580 } | |
| 581 #endif | |
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582 Events::log(thread, "DEOPT UNPACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT " mode %d", |
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583 stub_frame.pc(), stub_frame.sp(), exec_mode); |
| 0 | 584 |
| 585 UnrollBlock* info = array->unroll_block(); | |
| 586 | |
| 587 // Unpack the interpreter frames and any adapter frame (c2 only) we might create. | |
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588 array->unpack_to_stack(stub_frame, exec_mode, info->caller_actual_parameters()); |
| 0 | 589 |
| 590 BasicType bt = info->return_type(); | |
| 591 | |
| 592 // If we have an exception pending, claim that the return type is an oop | |
| 593 // so the deopt_blob does not overwrite the exception_oop. | |
| 594 | |
| 595 if (exec_mode == Unpack_exception) | |
| 596 bt = T_OBJECT; | |
| 597 | |
| 598 // Cleanup thread deopt data | |
| 599 cleanup_deopt_info(thread, array); | |
| 600 | |
| 601 #ifndef PRODUCT | |
| 602 if (VerifyStack) { | |
| 603 ResourceMark res_mark; | |
| 604 | |
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605 thread->validate_frame_layout(); |
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606 |
| 0 | 607 // Verify that the just-unpacked frames match the interpreter's |
| 608 // notions of expression stack and locals | |
| 609 vframeArray* cur_array = thread->vframe_array_last(); | |
| 610 RegisterMap rm(thread, false); | |
| 611 rm.set_include_argument_oops(false); | |
| 612 bool is_top_frame = true; | |
| 613 int callee_size_of_parameters = 0; | |
| 614 int callee_max_locals = 0; | |
| 615 for (int i = 0; i < cur_array->frames(); i++) { | |
| 616 vframeArrayElement* el = cur_array->element(i); | |
| 617 frame* iframe = el->iframe(); | |
| 618 guarantee(iframe->is_interpreted_frame(), "Wrong frame type"); | |
| 619 | |
| 620 // Get the oop map for this bci | |
| 621 InterpreterOopMap mask; | |
| 622 int cur_invoke_parameter_size = 0; | |
| 623 bool try_next_mask = false; | |
| 624 int next_mask_expression_stack_size = -1; | |
| 625 int top_frame_expression_stack_adjustment = 0; | |
| 626 methodHandle mh(thread, iframe->interpreter_frame_method()); | |
| 627 OopMapCache::compute_one_oop_map(mh, iframe->interpreter_frame_bci(), &mask); | |
| 628 BytecodeStream str(mh); | |
| 629 str.set_start(iframe->interpreter_frame_bci()); | |
| 630 int max_bci = mh->code_size(); | |
| 631 // Get to the next bytecode if possible | |
| 632 assert(str.bci() < max_bci, "bci in interpreter frame out of bounds"); | |
| 633 // Check to see if we can grab the number of outgoing arguments | |
| 634 // at an uncommon trap for an invoke (where the compiler | |
| 635 // generates debug info before the invoke has executed) | |
| 636 Bytecodes::Code cur_code = str.next(); | |
| 10390 | 637 if (cur_code == Bytecodes::_invokevirtual || |
| 638 cur_code == Bytecodes::_invokespecial || | |
| 639 cur_code == Bytecodes::_invokestatic || | |
| 640 cur_code == Bytecodes::_invokeinterface || | |
| 641 cur_code == Bytecodes::_invokedynamic) { | |
| 2142 | 642 Bytecode_invoke invoke(mh, iframe->interpreter_frame_bci()); |
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643 Symbol* signature = invoke.signature(); |
| 0 | 644 ArgumentSizeComputer asc(signature); |
| 645 cur_invoke_parameter_size = asc.size(); | |
| 10390 | 646 if (invoke.has_receiver()) { |
| 0 | 647 // Add in receiver |
| 648 ++cur_invoke_parameter_size; | |
| 649 } | |
| 10390 | 650 if (i != 0 && !invoke.is_invokedynamic() && MethodHandles::has_member_arg(invoke.klass(), invoke.name())) { |
| 651 callee_size_of_parameters++; | |
| 652 } | |
| 0 | 653 } |
| 654 if (str.bci() < max_bci) { | |
| 655 Bytecodes::Code bc = str.next(); | |
| 656 if (bc >= 0) { | |
| 657 // The interpreter oop map generator reports results before | |
| 658 // the current bytecode has executed except in the case of | |
| 659 // calls. It seems to be hard to tell whether the compiler | |
| 660 // has emitted debug information matching the "state before" | |
| 661 // a given bytecode or the state after, so we try both | |
| 662 switch (cur_code) { | |
| 663 case Bytecodes::_invokevirtual: | |
| 664 case Bytecodes::_invokespecial: | |
| 665 case Bytecodes::_invokestatic: | |
| 666 case Bytecodes::_invokeinterface: | |
| 10390 | 667 case Bytecodes::_invokedynamic: |
| 0 | 668 case Bytecodes::_athrow: |
| 669 break; | |
| 670 default: { | |
| 671 InterpreterOopMap next_mask; | |
| 672 OopMapCache::compute_one_oop_map(mh, str.bci(), &next_mask); | |
| 673 next_mask_expression_stack_size = next_mask.expression_stack_size(); | |
| 674 // Need to subtract off the size of the result type of | |
| 675 // the bytecode because this is not described in the | |
| 676 // debug info but returned to the interpreter in the TOS | |
| 677 // caching register | |
| 678 BasicType bytecode_result_type = Bytecodes::result_type(cur_code); | |
| 679 if (bytecode_result_type != T_ILLEGAL) { | |
| 680 top_frame_expression_stack_adjustment = type2size[bytecode_result_type]; | |
| 681 } | |
| 682 assert(top_frame_expression_stack_adjustment >= 0, ""); | |
| 683 try_next_mask = true; | |
| 684 break; | |
| 685 } | |
| 686 } | |
| 687 } | |
| 688 } | |
| 689 | |
| 690 // Verify stack depth and oops in frame | |
| 691 // This assertion may be dependent on the platform we're running on and may need modification (tested on x86 and sparc) | |
| 692 if (!( | |
| 693 /* SPARC */ | |
| 694 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_size_of_parameters) || | |
| 695 /* x86 */ | |
| 696 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_max_locals) || | |
| 697 (try_next_mask && | |
| 698 (iframe->interpreter_frame_expression_stack_size() == (next_mask_expression_stack_size - | |
| 699 top_frame_expression_stack_adjustment))) || | |
| 700 (is_top_frame && (exec_mode == Unpack_exception) && iframe->interpreter_frame_expression_stack_size() == 0) || | |
| 701 (is_top_frame && (exec_mode == Unpack_uncommon_trap || exec_mode == Unpack_reexecute) && | |
| 702 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + cur_invoke_parameter_size)) | |
| 703 )) { | |
| 704 ttyLocker ttyl; | |
| 705 | |
| 706 // Print out some information that will help us debug the problem | |
| 707 tty->print_cr("Wrong number of expression stack elements during deoptimization"); | |
| 708 tty->print_cr(" Error occurred while verifying frame %d (0..%d, 0 is topmost)", i, cur_array->frames() - 1); | |
| 709 tty->print_cr(" Fabricated interpreter frame had %d expression stack elements", | |
| 710 iframe->interpreter_frame_expression_stack_size()); | |
| 711 tty->print_cr(" Interpreter oop map had %d expression stack elements", mask.expression_stack_size()); | |
| 712 tty->print_cr(" try_next_mask = %d", try_next_mask); | |
| 713 tty->print_cr(" next_mask_expression_stack_size = %d", next_mask_expression_stack_size); | |
| 714 tty->print_cr(" callee_size_of_parameters = %d", callee_size_of_parameters); | |
| 715 tty->print_cr(" callee_max_locals = %d", callee_max_locals); | |
| 716 tty->print_cr(" top_frame_expression_stack_adjustment = %d", top_frame_expression_stack_adjustment); | |
| 717 tty->print_cr(" exec_mode = %d", exec_mode); | |
| 718 tty->print_cr(" cur_invoke_parameter_size = %d", cur_invoke_parameter_size); | |
| 719 tty->print_cr(" Thread = " INTPTR_FORMAT ", thread ID = " UINTX_FORMAT, thread, thread->osthread()->thread_id()); | |
| 720 tty->print_cr(" Interpreted frames:"); | |
| 721 for (int k = 0; k < cur_array->frames(); k++) { | |
| 722 vframeArrayElement* el = cur_array->element(k); | |
| 723 tty->print_cr(" %s (bci %d)", el->method()->name_and_sig_as_C_string(), el->bci()); | |
| 724 } | |
| 725 cur_array->print_on_2(tty); | |
| 726 guarantee(false, "wrong number of expression stack elements during deopt"); | |
| 727 } | |
| 728 VerifyOopClosure verify; | |
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729 iframe->oops_interpreted_do(&verify, NULL, &rm, false); |
| 0 | 730 callee_size_of_parameters = mh->size_of_parameters(); |
| 731 callee_max_locals = mh->max_locals(); | |
| 732 is_top_frame = false; | |
| 733 } | |
| 734 } | |
| 735 #endif /* !PRODUCT */ | |
| 736 | |
| 737 | |
| 738 return bt; | |
| 739 JRT_END | |
| 740 | |
| 741 | |
| 742 int Deoptimization::deoptimize_dependents() { | |
| 743 Threads::deoptimized_wrt_marked_nmethods(); | |
| 744 return 0; | |
| 745 } | |
| 746 | |
| 747 | |
| 748 #ifdef COMPILER2 | |
| 749 bool Deoptimization::realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS) { | |
| 750 Handle pending_exception(thread->pending_exception()); | |
| 751 const char* exception_file = thread->exception_file(); | |
| 752 int exception_line = thread->exception_line(); | |
| 753 thread->clear_pending_exception(); | |
| 754 | |
| 755 for (int i = 0; i < objects->length(); i++) { | |
| 756 assert(objects->at(i)->is_object(), "invalid debug information"); | |
| 757 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
| 758 | |
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759 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 760 oop obj = NULL; |
| 761 | |
| 762 if (k->oop_is_instance()) { | |
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763 InstanceKlass* ik = InstanceKlass::cast(k()); |
| 0 | 764 obj = ik->allocate_instance(CHECK_(false)); |
| 765 } else if (k->oop_is_typeArray()) { | |
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766 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
| 0 | 767 assert(sv->field_size() % type2size[ak->element_type()] == 0, "non-integral array length"); |
| 768 int len = sv->field_size() / type2size[ak->element_type()]; | |
| 769 obj = ak->allocate(len, CHECK_(false)); | |
| 770 } else if (k->oop_is_objArray()) { | |
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771 ObjArrayKlass* ak = ObjArrayKlass::cast(k()); |
| 0 | 772 obj = ak->allocate(sv->field_size(), CHECK_(false)); |
| 773 } | |
| 774 | |
| 775 assert(obj != NULL, "allocation failed"); | |
| 776 assert(sv->value().is_null(), "redundant reallocation"); | |
| 777 sv->set_value(obj); | |
| 778 } | |
| 779 | |
| 780 if (pending_exception.not_null()) { | |
| 781 thread->set_pending_exception(pending_exception(), exception_file, exception_line); | |
| 782 } | |
| 783 | |
| 784 return true; | |
| 785 } | |
| 786 | |
| 787 // This assumes that the fields are stored in ObjectValue in the same order | |
| 788 // they are yielded by do_nonstatic_fields. | |
| 789 class FieldReassigner: public FieldClosure { | |
| 790 frame* _fr; | |
| 791 RegisterMap* _reg_map; | |
| 792 ObjectValue* _sv; | |
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793 InstanceKlass* _ik; |
| 0 | 794 oop _obj; |
| 795 | |
| 796 int _i; | |
| 797 public: | |
| 798 FieldReassigner(frame* fr, RegisterMap* reg_map, ObjectValue* sv, oop obj) : | |
| 799 _fr(fr), _reg_map(reg_map), _sv(sv), _obj(obj), _i(0) {} | |
| 800 | |
| 801 int i() const { return _i; } | |
| 802 | |
| 803 | |
| 804 void do_field(fieldDescriptor* fd) { | |
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805 intptr_t val; |
| 0 | 806 StackValue* value = |
| 807 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(i())); | |
| 808 int offset = fd->offset(); | |
| 809 switch (fd->field_type()) { | |
| 810 case T_OBJECT: case T_ARRAY: | |
| 811 assert(value->type() == T_OBJECT, "Agreement."); | |
| 812 _obj->obj_field_put(offset, value->get_obj()()); | |
| 813 break; | |
| 814 | |
| 815 case T_LONG: case T_DOUBLE: { | |
| 816 assert(value->type() == T_INT, "Agreement."); | |
| 817 StackValue* low = | |
| 818 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(++_i)); | |
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819 #ifdef _LP64 |
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820 jlong res = (jlong)low->get_int(); |
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821 #else |
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822 #ifdef SPARC |
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823 // For SPARC we have to swap high and low words. |
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824 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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825 #else |
| 0 | 826 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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827 #endif //SPARC |
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828 #endif |
| 0 | 829 _obj->long_field_put(offset, res); |
| 830 break; | |
| 831 } | |
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832 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
| 0 | 833 case T_INT: case T_FLOAT: // 4 bytes. |
| 834 assert(value->type() == T_INT, "Agreement."); | |
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835 val = value->get_int(); |
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836 _obj->int_field_put(offset, (jint)*((jint*)&val)); |
| 0 | 837 break; |
| 838 | |
| 839 case T_SHORT: case T_CHAR: // 2 bytes | |
| 840 assert(value->type() == T_INT, "Agreement."); | |
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841 val = value->get_int(); |
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842 _obj->short_field_put(offset, (jshort)*((jint*)&val)); |
| 0 | 843 break; |
| 844 | |
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845 case T_BOOLEAN: case T_BYTE: // 1 byte |
| 0 | 846 assert(value->type() == T_INT, "Agreement."); |
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847 val = value->get_int(); |
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848 _obj->bool_field_put(offset, (jboolean)*((jint*)&val)); |
| 0 | 849 break; |
| 850 | |
| 851 default: | |
| 852 ShouldNotReachHere(); | |
| 853 } | |
| 854 _i++; | |
| 855 } | |
| 856 }; | |
| 857 | |
| 858 // restore elements of an eliminated type array | |
| 859 void Deoptimization::reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type) { | |
| 860 int index = 0; | |
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861 intptr_t val; |
| 0 | 862 |
| 863 for (int i = 0; i < sv->field_size(); i++) { | |
| 864 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
| 865 switch(type) { | |
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866 case T_LONG: case T_DOUBLE: { |
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867 assert(value->type() == T_INT, "Agreement."); |
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868 StackValue* low = |
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869 StackValue::create_stack_value(fr, reg_map, sv->field_at(++i)); |
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870 #ifdef _LP64 |
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871 jlong res = (jlong)low->get_int(); |
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872 #else |
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873 #ifdef SPARC |
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874 // For SPARC we have to swap high and low words. |
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875 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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876 #else |
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877 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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878 #endif //SPARC |
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879 #endif |
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880 obj->long_at_put(index, res); |
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881 break; |
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882 } |
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883 |
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884 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
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885 case T_INT: case T_FLOAT: // 4 bytes. |
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886 assert(value->type() == T_INT, "Agreement."); |
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887 val = value->get_int(); |
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888 obj->int_at_put(index, (jint)*((jint*)&val)); |
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889 break; |
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890 |
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891 case T_SHORT: case T_CHAR: // 2 bytes |
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892 assert(value->type() == T_INT, "Agreement."); |
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893 val = value->get_int(); |
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894 obj->short_at_put(index, (jshort)*((jint*)&val)); |
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895 break; |
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896 |
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897 case T_BOOLEAN: case T_BYTE: // 1 byte |
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898 assert(value->type() == T_INT, "Agreement."); |
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899 val = value->get_int(); |
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900 obj->bool_at_put(index, (jboolean)*((jint*)&val)); |
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901 break; |
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902 |
| 0 | 903 default: |
| 904 ShouldNotReachHere(); | |
| 905 } | |
| 906 index++; | |
| 907 } | |
| 908 } | |
| 909 | |
| 910 | |
| 911 // restore fields of an eliminated object array | |
| 912 void Deoptimization::reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj) { | |
| 913 for (int i = 0; i < sv->field_size(); i++) { | |
| 914 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
| 915 assert(value->type() == T_OBJECT, "object element expected"); | |
| 916 obj->obj_at_put(i, value->get_obj()()); | |
| 917 } | |
| 918 } | |
| 919 | |
| 920 | |
| 921 // restore fields of all eliminated objects and arrays | |
| 922 void Deoptimization::reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects) { | |
| 923 for (int i = 0; i < objects->length(); i++) { | |
| 924 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
|
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925 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 926 Handle obj = sv->value(); |
| 927 assert(obj.not_null(), "reallocation was missed"); | |
| 928 | |
| 929 if (k->oop_is_instance()) { | |
|
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930 InstanceKlass* ik = InstanceKlass::cast(k()); |
| 0 | 931 FieldReassigner reassign(fr, reg_map, sv, obj()); |
| 932 ik->do_nonstatic_fields(&reassign); | |
| 933 } else if (k->oop_is_typeArray()) { | |
|
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934 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
| 0 | 935 reassign_type_array_elements(fr, reg_map, sv, (typeArrayOop) obj(), ak->element_type()); |
| 936 } else if (k->oop_is_objArray()) { | |
| 937 reassign_object_array_elements(fr, reg_map, sv, (objArrayOop) obj()); | |
| 938 } | |
| 939 } | |
| 940 } | |
| 941 | |
| 942 | |
| 943 // relock objects for which synchronization was eliminated | |
|
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944 void Deoptimization::relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread) { |
| 0 | 945 for (int i = 0; i < monitors->length(); i++) { |
|
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946 MonitorInfo* mon_info = monitors->at(i); |
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947 if (mon_info->eliminated()) { |
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948 assert(mon_info->owner() != NULL, "reallocation was missed"); |
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949 Handle obj = Handle(mon_info->owner()); |
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950 markOop mark = obj->mark(); |
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951 if (UseBiasedLocking && mark->has_bias_pattern()) { |
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952 // New allocated objects may have the mark set to anonymously biased. |
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953 // Also the deoptimized method may called methods with synchronization |
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954 // where the thread-local object is bias locked to the current thread. |
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955 assert(mark->is_biased_anonymously() || |
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956 mark->biased_locker() == thread, "should be locked to current thread"); |
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957 // Reset mark word to unbiased prototype. |
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958 markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
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959 obj->set_mark(unbiased_prototype); |
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960 } |
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961 BasicLock* lock = mon_info->lock(); |
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962 ObjectSynchronizer::slow_enter(obj, lock, thread); |
| 0 | 963 } |
|
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964 assert(mon_info->owner()->is_locked(), "object must be locked now"); |
| 0 | 965 } |
| 966 } | |
| 967 | |
| 968 | |
| 969 #ifndef PRODUCT | |
| 970 // print information about reallocated objects | |
| 971 void Deoptimization::print_objects(GrowableArray<ScopeValue*>* objects) { | |
| 972 fieldDescriptor fd; | |
| 973 | |
| 974 for (int i = 0; i < objects->length(); i++) { | |
| 975 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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976 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 977 Handle obj = sv->value(); |
| 978 | |
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979 tty->print(" object <" INTPTR_FORMAT "> of type ", (void *)sv->value()()); |
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980 k->print_value(); |
| 0 | 981 tty->print(" allocated (%d bytes)", obj->size() * HeapWordSize); |
| 982 tty->cr(); | |
| 983 | |
| 984 if (Verbose) { | |
| 985 k->oop_print_on(obj(), tty); | |
| 986 } | |
| 987 } | |
| 988 } | |
| 989 #endif | |
| 990 #endif // COMPILER2 | |
| 991 | |
| 992 vframeArray* Deoptimization::create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk) { | |
|
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993 Events::log(thread, "DEOPT PACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT, fr.pc(), fr.sp()); |
| 0 | 994 |
| 995 #ifndef PRODUCT | |
| 996 if (TraceDeoptimization) { | |
| 997 ttyLocker ttyl; | |
| 998 tty->print("DEOPT PACKING thread " INTPTR_FORMAT " ", thread); | |
| 999 fr.print_on(tty); | |
| 1000 tty->print_cr(" Virtual frames (innermost first):"); | |
| 1001 for (int index = 0; index < chunk->length(); index++) { | |
| 1002 compiledVFrame* vf = chunk->at(index); | |
| 1003 tty->print(" %2d - ", index); | |
| 1004 vf->print_value(); | |
| 1005 int bci = chunk->at(index)->raw_bci(); | |
| 1006 const char* code_name; | |
| 1007 if (bci == SynchronizationEntryBCI) { | |
| 1008 code_name = "sync entry"; | |
| 1009 } else { | |
| 2142 | 1010 Bytecodes::Code code = vf->method()->code_at(bci); |
| 0 | 1011 code_name = Bytecodes::name(code); |
| 1012 } | |
| 1013 tty->print(" - %s", code_name); | |
| 1014 tty->print_cr(" @ bci %d ", bci); | |
| 1015 if (Verbose) { | |
| 1016 vf->print(); | |
| 1017 tty->cr(); | |
| 1018 } | |
| 1019 } | |
| 1020 } | |
| 1021 #endif | |
| 1022 | |
| 1023 // Register map for next frame (used for stack crawl). We capture | |
| 1024 // the state of the deopt'ing frame's caller. Thus if we need to | |
| 1025 // stuff a C2I adapter we can properly fill in the callee-save | |
| 1026 // register locations. | |
| 1027 frame caller = fr.sender(reg_map); | |
| 1028 int frame_size = caller.sp() - fr.sp(); | |
| 1029 | |
| 1030 frame sender = caller; | |
| 1031 | |
| 1032 // Since the Java thread being deoptimized will eventually adjust it's own stack, | |
| 1033 // the vframeArray containing the unpacking information is allocated in the C heap. | |
| 1034 // For Compiler1, the caller of the deoptimized frame is saved for use by unpack_frames(). | |
| 1035 vframeArray* array = vframeArray::allocate(thread, frame_size, chunk, reg_map, sender, caller, fr); | |
| 1036 | |
| 1037 // Compare the vframeArray to the collected vframes | |
| 1038 assert(array->structural_compare(thread, chunk), "just checking"); | |
| 1039 | |
| 1040 #ifndef PRODUCT | |
| 1041 if (TraceDeoptimization) { | |
| 1042 ttyLocker ttyl; | |
| 1043 tty->print_cr(" Created vframeArray " INTPTR_FORMAT, array); | |
| 1044 } | |
| 1045 #endif // PRODUCT | |
| 1046 | |
| 1047 return array; | |
| 1048 } | |
| 1049 | |
| 1050 | |
| 1051 static void collect_monitors(compiledVFrame* cvf, GrowableArray<Handle>* objects_to_revoke) { | |
| 1052 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); | |
| 1053 for (int i = 0; i < monitors->length(); i++) { | |
| 1054 MonitorInfo* mon_info = monitors->at(i); | |
|
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1055 if (!mon_info->eliminated() && mon_info->owner() != NULL) { |
| 0 | 1056 objects_to_revoke->append(Handle(mon_info->owner())); |
| 1057 } | |
| 1058 } | |
| 1059 } | |
| 1060 | |
| 1061 | |
| 1062 void Deoptimization::revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map) { | |
| 1063 if (!UseBiasedLocking) { | |
| 1064 return; | |
| 1065 } | |
| 1066 | |
| 1067 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
| 1068 | |
| 1069 // Unfortunately we don't have a RegisterMap available in most of | |
| 1070 // the places we want to call this routine so we need to walk the | |
| 1071 // stack again to update the register map. | |
| 1072 if (map == NULL || !map->update_map()) { | |
| 1073 StackFrameStream sfs(thread, true); | |
| 1074 bool found = false; | |
| 1075 while (!found && !sfs.is_done()) { | |
| 1076 frame* cur = sfs.current(); | |
| 1077 sfs.next(); | |
| 1078 found = cur->id() == fr.id(); | |
| 1079 } | |
| 1080 assert(found, "frame to be deoptimized not found on target thread's stack"); | |
| 1081 map = sfs.register_map(); | |
| 1082 } | |
| 1083 | |
| 1084 vframe* vf = vframe::new_vframe(&fr, map, thread); | |
| 1085 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1086 // Revoke monitors' biases in all scopes | |
| 1087 while (!cvf->is_top()) { | |
| 1088 collect_monitors(cvf, objects_to_revoke); | |
| 1089 cvf = compiledVFrame::cast(cvf->sender()); | |
| 1090 } | |
| 1091 collect_monitors(cvf, objects_to_revoke); | |
| 1092 | |
| 1093 if (SafepointSynchronize::is_at_safepoint()) { | |
| 1094 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
| 1095 } else { | |
| 1096 BiasedLocking::revoke(objects_to_revoke); | |
| 1097 } | |
| 1098 } | |
| 1099 | |
| 1100 | |
| 1101 void Deoptimization::revoke_biases_of_monitors(CodeBlob* cb) { | |
| 1102 if (!UseBiasedLocking) { | |
| 1103 return; | |
| 1104 } | |
| 1105 | |
| 1106 assert(SafepointSynchronize::is_at_safepoint(), "must only be called from safepoint"); | |
| 1107 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
| 1108 for (JavaThread* jt = Threads::first(); jt != NULL ; jt = jt->next()) { | |
| 1109 if (jt->has_last_Java_frame()) { | |
| 1110 StackFrameStream sfs(jt, true); | |
| 1111 while (!sfs.is_done()) { | |
| 1112 frame* cur = sfs.current(); | |
| 1113 if (cb->contains(cur->pc())) { | |
| 1114 vframe* vf = vframe::new_vframe(cur, sfs.register_map(), jt); | |
| 1115 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1116 // Revoke monitors' biases in all scopes | |
| 1117 while (!cvf->is_top()) { | |
| 1118 collect_monitors(cvf, objects_to_revoke); | |
| 1119 cvf = compiledVFrame::cast(cvf->sender()); | |
| 1120 } | |
| 1121 collect_monitors(cvf, objects_to_revoke); | |
| 1122 } | |
| 1123 sfs.next(); | |
| 1124 } | |
| 1125 } | |
| 1126 } | |
| 1127 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
| 1128 } | |
| 1129 | |
| 1130 | |
| 1131 void Deoptimization::deoptimize_single_frame(JavaThread* thread, frame fr) { | |
| 1132 assert(fr.can_be_deoptimized(), "checking frame type"); | |
| 1133 | |
| 1134 gather_statistics(Reason_constraint, Action_none, Bytecodes::_illegal); | |
| 1135 | |
| 1136 // Patch the nmethod so that when execution returns to it we will | |
| 1137 // deopt the execution state and return to the interpreter. | |
| 1138 fr.deoptimize(thread); | |
| 1139 } | |
| 1140 | |
| 1141 void Deoptimization::deoptimize(JavaThread* thread, frame fr, RegisterMap *map) { | |
| 1142 // Deoptimize only if the frame comes from compile code. | |
| 1143 // Do not deoptimize the frame which is already patched | |
| 1144 // during the execution of the loops below. | |
| 1145 if (!fr.is_compiled_frame() || fr.is_deoptimized_frame()) { | |
| 1146 return; | |
| 1147 } | |
| 1148 ResourceMark rm; | |
| 1149 DeoptimizationMarker dm; | |
| 1150 if (UseBiasedLocking) { | |
| 1151 revoke_biases_of_monitors(thread, fr, map); | |
| 1152 } | |
| 1153 deoptimize_single_frame(thread, fr); | |
| 1154 | |
| 1155 } | |
| 1156 | |
| 1157 | |
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1158 void Deoptimization::deoptimize_frame_internal(JavaThread* thread, intptr_t* id) { |
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1159 assert(thread == Thread::current() || SafepointSynchronize::is_at_safepoint(), |
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1160 "can only deoptimize other thread at a safepoint"); |
| 0 | 1161 // Compute frame and register map based on thread and sp. |
| 1162 RegisterMap reg_map(thread, UseBiasedLocking); | |
| 1163 frame fr = thread->last_frame(); | |
| 1164 while (fr.id() != id) { | |
| 1165 fr = fr.sender(®_map); | |
| 1166 } | |
| 1167 deoptimize(thread, fr, ®_map); | |
| 1168 } | |
| 1169 | |
| 1170 | |
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1171 void Deoptimization::deoptimize_frame(JavaThread* thread, intptr_t* id) { |
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1172 if (thread == Thread::current()) { |
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1173 Deoptimization::deoptimize_frame_internal(thread, id); |
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1174 } else { |
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1175 VM_DeoptimizeFrame deopt(thread, id); |
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1176 VMThread::execute(&deopt); |
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1177 } |
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1178 } |
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1179 |
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1180 |
| 0 | 1181 // JVMTI PopFrame support |
| 1182 JRT_LEAF(void, Deoptimization::popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address)) | |
| 1183 { | |
| 1184 thread->popframe_preserve_args(in_ByteSize(bytes_to_save), start_address); | |
| 1185 } | |
| 1186 JRT_END | |
| 1187 | |
| 1188 | |
| 1692 | 1189 #if defined(COMPILER2) || defined(SHARK) |
| 0 | 1190 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS) { |
| 1191 // in case of an unresolved klass entry, load the class. | |
| 1192 if (constant_pool->tag_at(index).is_unresolved_klass()) { | |
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1193 Klass* tk = constant_pool->klass_at(index, CHECK); |
| 0 | 1194 return; |
| 1195 } | |
| 1196 | |
| 1197 if (!constant_pool->tag_at(index).is_symbol()) return; | |
| 1198 | |
|
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1199 Handle class_loader (THREAD, constant_pool->pool_holder()->class_loader()); |
|
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1200 Symbol* symbol = constant_pool->symbol_at(index); |
| 0 | 1201 |
| 1202 // class name? | |
| 1203 if (symbol->byte_at(0) != '(') { | |
|
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1204 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
| 0 | 1205 SystemDictionary::resolve_or_null(symbol, class_loader, protection_domain, CHECK); |
| 1206 return; | |
| 1207 } | |
| 1208 | |
| 1209 // then it must be a signature! | |
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1210 ResourceMark rm(THREAD); |
| 0 | 1211 for (SignatureStream ss(symbol); !ss.is_done(); ss.next()) { |
| 1212 if (ss.is_object()) { | |
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1213 Symbol* class_name = ss.as_symbol(CHECK); |
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1214 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
| 0 | 1215 SystemDictionary::resolve_or_null(class_name, class_loader, protection_domain, CHECK); |
| 1216 } | |
| 1217 } | |
| 1218 } | |
| 1219 | |
| 1220 | |
| 1221 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) { | |
| 1222 EXCEPTION_MARK; | |
| 1223 load_class_by_index(constant_pool, index, THREAD); | |
| 1224 if (HAS_PENDING_EXCEPTION) { | |
| 1225 // Exception happened during classloading. We ignore the exception here, since it | |
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1226 // is going to be rethrown since the current activation is going to be deoptimized and |
| 0 | 1227 // the interpreter will re-execute the bytecode. |
| 1228 CLEAR_PENDING_EXCEPTION; | |
|
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1229 // Class loading called java code which may have caused a stack |
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1230 // overflow. If the exception was thrown right before the return |
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1231 // to the runtime the stack is no longer guarded. Reguard the |
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1232 // stack otherwise if we return to the uncommon trap blob and the |
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1233 // stack bang causes a stack overflow we crash. |
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1234 assert(THREAD->is_Java_thread(), "only a java thread can be here"); |
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1235 JavaThread* thread = (JavaThread*)THREAD; |
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1236 bool guard_pages_enabled = thread->stack_yellow_zone_enabled(); |
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1237 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); |
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1238 assert(guard_pages_enabled, "stack banging in uncommon trap blob may cause crash"); |
| 0 | 1239 } |
| 1240 } | |
| 1241 | |
| 1242 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) { | |
| 1243 HandleMark hm; | |
| 1244 | |
| 1245 // uncommon_trap() is called at the beginning of the uncommon trap | |
| 1246 // handler. Note this fact before we start generating temporary frames | |
| 1247 // that can confuse an asynchronous stack walker. This counter is | |
| 1248 // decremented at the end of unpack_frames(). | |
| 1249 thread->inc_in_deopt_handler(); | |
| 1250 | |
| 1251 // We need to update the map if we have biased locking. | |
| 1252 RegisterMap reg_map(thread, UseBiasedLocking); | |
| 1253 frame stub_frame = thread->last_frame(); | |
| 1254 frame fr = stub_frame.sender(®_map); | |
| 1255 // Make sure the calling nmethod is not getting deoptimized and removed | |
| 1256 // before we are done with it. | |
| 1257 nmethodLocker nl(fr.pc()); | |
| 1258 | |
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1259 // Log a message |
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1260 Events::log(thread, "Uncommon trap: trap_request=" PTR32_FORMAT " fr.pc=" INTPTR_FORMAT, |
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1261 trap_request, fr.pc()); |
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1262 |
| 0 | 1263 { |
| 1264 ResourceMark rm; | |
| 1265 | |
| 1266 // Revoke biases of any monitors in the frame to ensure we can migrate them | |
| 1267 revoke_biases_of_monitors(thread, fr, ®_map); | |
| 1268 | |
| 1269 DeoptReason reason = trap_request_reason(trap_request); | |
| 1270 DeoptAction action = trap_request_action(trap_request); | |
| 1271 jint unloaded_class_index = trap_request_index(trap_request); // CP idx or -1 | |
| 1272 | |
| 1273 vframe* vf = vframe::new_vframe(&fr, ®_map, thread); | |
| 1274 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1275 | |
| 1276 nmethod* nm = cvf->code(); | |
| 1277 | |
| 1278 ScopeDesc* trap_scope = cvf->scope(); | |
| 1279 methodHandle trap_method = trap_scope->method(); | |
| 1280 int trap_bci = trap_scope->bci(); | |
| 2142 | 1281 Bytecodes::Code trap_bc = trap_method->java_code_at(trap_bci); |
| 0 | 1282 |
| 1283 // Record this event in the histogram. | |
| 1284 gather_statistics(reason, action, trap_bc); | |
| 1285 | |
| 1286 // Ensure that we can record deopt. history: | |
| 17780 | 1287 // Need MDO to record RTM code generation state. |
| 1288 bool create_if_missing = ProfileTraps RTM_OPT_ONLY( || UseRTMLocking ); | |
| 0 | 1289 |
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1290 MethodData* trap_mdo = |
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1291 get_method_data(thread, trap_method, create_if_missing); |
| 0 | 1292 |
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1293 // Log a message |
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1294 Events::log_deopt_message(thread, "Uncommon trap: reason=%s action=%s pc=" INTPTR_FORMAT " method=%s @ %d", |
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1295 trap_reason_name(reason), trap_action_name(action), fr.pc(), |
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1296 trap_method->name_and_sig_as_C_string(), trap_bci); |
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1297 |
| 0 | 1298 // Print a bunch of diagnostics, if requested. |
| 1299 if (TraceDeoptimization || LogCompilation) { | |
| 1300 ResourceMark rm; | |
| 1301 ttyLocker ttyl; | |
| 1302 char buf[100]; | |
| 1303 if (xtty != NULL) { | |
| 1304 xtty->begin_head("uncommon_trap thread='" UINTX_FORMAT"' %s", | |
| 1305 os::current_thread_id(), | |
| 1306 format_trap_request(buf, sizeof(buf), trap_request)); | |
| 1307 nm->log_identity(xtty); | |
| 1308 } | |
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1309 Symbol* class_name = NULL; |
| 0 | 1310 bool unresolved = false; |
| 1311 if (unloaded_class_index >= 0) { | |
| 1312 constantPoolHandle constants (THREAD, trap_method->constants()); | |
| 1313 if (constants->tag_at(unloaded_class_index).is_unresolved_klass()) { | |
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1314 class_name = constants->klass_name_at(unloaded_class_index); |
| 0 | 1315 unresolved = true; |
| 1316 if (xtty != NULL) | |
| 1317 xtty->print(" unresolved='1'"); | |
| 1318 } else if (constants->tag_at(unloaded_class_index).is_symbol()) { | |
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1319 class_name = constants->symbol_at(unloaded_class_index); |
| 0 | 1320 } |
| 1321 if (xtty != NULL) | |
| 1322 xtty->name(class_name); | |
| 1323 } | |
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1324 if (xtty != NULL && trap_mdo != NULL) { |
| 0 | 1325 // Dump the relevant MDO state. |
| 1326 // This is the deopt count for the current reason, any previous | |
| 1327 // reasons or recompiles seen at this point. | |
| 1328 int dcnt = trap_mdo->trap_count(reason); | |
| 1329 if (dcnt != 0) | |
| 1330 xtty->print(" count='%d'", dcnt); | |
| 1331 ProfileData* pdata = trap_mdo->bci_to_data(trap_bci); | |
| 1332 int dos = (pdata == NULL)? 0: pdata->trap_state(); | |
| 1333 if (dos != 0) { | |
| 1334 xtty->print(" state='%s'", format_trap_state(buf, sizeof(buf), dos)); | |
| 1335 if (trap_state_is_recompiled(dos)) { | |
| 1336 int recnt2 = trap_mdo->overflow_recompile_count(); | |
| 1337 if (recnt2 != 0) | |
| 1338 xtty->print(" recompiles2='%d'", recnt2); | |
| 1339 } | |
| 1340 } | |
| 1341 } | |
| 1342 if (xtty != NULL) { | |
| 1343 xtty->stamp(); | |
| 1344 xtty->end_head(); | |
| 1345 } | |
| 1346 if (TraceDeoptimization) { // make noise on the tty | |
| 1347 tty->print("Uncommon trap occurred in"); | |
| 1348 nm->method()->print_short_name(tty); | |
| 6843 | 1349 tty->print(" (@" INTPTR_FORMAT ") thread=" UINTX_FORMAT " reason=%s action=%s unloaded_class_index=%d", |
| 0 | 1350 fr.pc(), |
| 6843 | 1351 os::current_thread_id(), |
| 0 | 1352 trap_reason_name(reason), |
| 1353 trap_action_name(action), | |
| 1354 unloaded_class_index); | |
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1355 if (class_name != NULL) { |
| 0 | 1356 tty->print(unresolved ? " unresolved class: " : " symbol: "); |
| 1357 class_name->print_symbol_on(tty); | |
| 1358 } | |
| 1359 tty->cr(); | |
| 1360 } | |
| 1361 if (xtty != NULL) { | |
| 1362 // Log the precise location of the trap. | |
| 1363 for (ScopeDesc* sd = trap_scope; ; sd = sd->sender()) { | |
| 1364 xtty->begin_elem("jvms bci='%d'", sd->bci()); | |
| 1365 xtty->method(sd->method()); | |
| 1366 xtty->end_elem(); | |
| 1367 if (sd->is_top()) break; | |
| 1368 } | |
| 1369 xtty->tail("uncommon_trap"); | |
| 1370 } | |
| 1371 } | |
| 1372 // (End diagnostic printout.) | |
| 1373 | |
| 1374 // Load class if necessary | |
| 1375 if (unloaded_class_index >= 0) { | |
| 1376 constantPoolHandle constants(THREAD, trap_method->constants()); | |
| 1377 load_class_by_index(constants, unloaded_class_index); | |
| 1378 } | |
| 1379 | |
| 1380 // Flush the nmethod if necessary and desirable. | |
| 1381 // | |
| 1382 // We need to avoid situations where we are re-flushing the nmethod | |
| 1383 // because of a hot deoptimization site. Repeated flushes at the same | |
| 1384 // point need to be detected by the compiler and avoided. If the compiler | |
| 1385 // cannot avoid them (or has a bug and "refuses" to avoid them), this | |
| 1386 // module must take measures to avoid an infinite cycle of recompilation | |
| 1387 // and deoptimization. There are several such measures: | |
| 1388 // | |
| 1389 // 1. If a recompilation is ordered a second time at some site X | |
| 1390 // and for the same reason R, the action is adjusted to 'reinterpret', | |
| 1391 // to give the interpreter time to exercise the method more thoroughly. | |
| 1392 // If this happens, the method's overflow_recompile_count is incremented. | |
| 1393 // | |
| 1394 // 2. If the compiler fails to reduce the deoptimization rate, then | |
| 1395 // the method's overflow_recompile_count will begin to exceed the set | |
| 1396 // limit PerBytecodeRecompilationCutoff. If this happens, the action | |
| 1397 // is adjusted to 'make_not_compilable', and the method is abandoned | |
| 1398 // to the interpreter. This is a performance hit for hot methods, | |
| 1399 // but is better than a disastrous infinite cycle of recompilations. | |
| 1400 // (Actually, only the method containing the site X is abandoned.) | |
| 1401 // | |
| 1402 // 3. In parallel with the previous measures, if the total number of | |
| 1403 // recompilations of a method exceeds the much larger set limit | |
| 1404 // PerMethodRecompilationCutoff, the method is abandoned. | |
| 1405 // This should only happen if the method is very large and has | |
| 1406 // many "lukewarm" deoptimizations. The code which enforces this | |
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1407 // limit is elsewhere (class nmethod, class Method). |
| 0 | 1408 // |
| 1409 // Note that the per-BCI 'is_recompiled' bit gives the compiler one chance | |
| 1410 // to recompile at each bytecode independently of the per-BCI cutoff. | |
| 1411 // | |
| 1412 // The decision to update code is up to the compiler, and is encoded | |
| 1413 // in the Action_xxx code. If the compiler requests Action_none | |
| 1414 // no trap state is changed, no compiled code is changed, and the | |
| 1415 // computation suffers along in the interpreter. | |
| 1416 // | |
| 1417 // The other action codes specify various tactics for decompilation | |
| 1418 // and recompilation. Action_maybe_recompile is the loosest, and | |
| 1419 // allows the compiled code to stay around until enough traps are seen, | |
| 1420 // and until the compiler gets around to recompiling the trapping method. | |
| 1421 // | |
| 1422 // The other actions cause immediate removal of the present code. | |
| 1423 | |
| 1424 bool update_trap_state = true; | |
| 1425 bool make_not_entrant = false; | |
| 1426 bool make_not_compilable = false; | |
| 1783 | 1427 bool reprofile = false; |
| 0 | 1428 switch (action) { |
| 1429 case Action_none: | |
| 1430 // Keep the old code. | |
| 1431 update_trap_state = false; | |
| 1432 break; | |
| 1433 case Action_maybe_recompile: | |
| 1434 // Do not need to invalidate the present code, but we can | |
| 1435 // initiate another | |
| 1436 // Start compiler without (necessarily) invalidating the nmethod. | |
| 1437 // The system will tolerate the old code, but new code should be | |
| 1438 // generated when possible. | |
| 1439 break; | |
| 1440 case Action_reinterpret: | |
| 1441 // Go back into the interpreter for a while, and then consider | |
| 1442 // recompiling form scratch. | |
| 1443 make_not_entrant = true; | |
| 1444 // Reset invocation counter for outer most method. | |
| 1445 // This will allow the interpreter to exercise the bytecodes | |
| 1446 // for a while before recompiling. | |
| 1447 // By contrast, Action_make_not_entrant is immediate. | |
| 1448 // | |
| 1449 // Note that the compiler will track null_check, null_assert, | |
| 1450 // range_check, and class_check events and log them as if they | |
| 1451 // had been traps taken from compiled code. This will update | |
| 1452 // the MDO trap history so that the next compilation will | |
| 1453 // properly detect hot trap sites. | |
| 1783 | 1454 reprofile = true; |
| 0 | 1455 break; |
| 1456 case Action_make_not_entrant: | |
| 1457 // Request immediate recompilation, and get rid of the old code. | |
| 1458 // Make them not entrant, so next time they are called they get | |
| 1459 // recompiled. Unloaded classes are loaded now so recompile before next | |
| 1460 // time they are called. Same for uninitialized. The interpreter will | |
| 1461 // link the missing class, if any. | |
| 1462 make_not_entrant = true; | |
| 1463 break; | |
| 1464 case Action_make_not_compilable: | |
| 1465 // Give up on compiling this method at all. | |
| 1466 make_not_entrant = true; | |
| 1467 make_not_compilable = true; | |
| 1468 break; | |
| 1469 default: | |
| 1470 ShouldNotReachHere(); | |
| 1471 } | |
| 1472 | |
| 1473 // Setting +ProfileTraps fixes the following, on all platforms: | |
| 1474 // 4852688: ProfileInterpreter is off by default for ia64. The result is | |
| 1475 // infinite heroic-opt-uncommon-trap/deopt/recompile cycles, since the | |
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1476 // recompile relies on a MethodData* to record heroic opt failures. |
| 0 | 1477 |
| 1478 // Whether the interpreter is producing MDO data or not, we also need | |
| 1479 // to use the MDO to detect hot deoptimization points and control | |
| 1480 // aggressive optimization. | |
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1481 bool inc_recompile_count = false; |
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1482 ProfileData* pdata = NULL; |
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1483 if (ProfileTraps && update_trap_state && trap_mdo != NULL) { |
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1484 assert(trap_mdo == get_method_data(thread, trap_method, false), "sanity"); |
| 0 | 1485 uint this_trap_count = 0; |
| 1486 bool maybe_prior_trap = false; | |
| 1487 bool maybe_prior_recompile = false; | |
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1488 pdata = query_update_method_data(trap_mdo, trap_bci, reason, |
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1489 nm->method(), |
| 0 | 1490 //outputs: |
| 1491 this_trap_count, | |
| 1492 maybe_prior_trap, | |
| 1493 maybe_prior_recompile); | |
| 1494 // Because the interpreter also counts null, div0, range, and class | |
| 1495 // checks, these traps from compiled code are double-counted. | |
| 1496 // This is harmless; it just means that the PerXTrapLimit values | |
| 1497 // are in effect a little smaller than they look. | |
| 1498 | |
| 1499 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
| 1500 if (per_bc_reason != Reason_none) { | |
| 1501 // Now take action based on the partially known per-BCI history. | |
| 1502 if (maybe_prior_trap | |
| 1503 && this_trap_count >= (uint)PerBytecodeTrapLimit) { | |
| 1504 // If there are too many traps at this BCI, force a recompile. | |
| 1505 // This will allow the compiler to see the limit overflow, and | |
| 1506 // take corrective action, if possible. The compiler generally | |
| 1507 // does not use the exact PerBytecodeTrapLimit value, but instead | |
| 1508 // changes its tactics if it sees any traps at all. This provides | |
| 1509 // a little hysteresis, delaying a recompile until a trap happens | |
| 1510 // several times. | |
| 1511 // | |
| 1512 // Actually, since there is only one bit of counter per BCI, | |
| 1513 // the possible per-BCI counts are {0,1,(per-method count)}. | |
| 1514 // This produces accurate results if in fact there is only | |
| 1515 // one hot trap site, but begins to get fuzzy if there are | |
| 1516 // many sites. For example, if there are ten sites each | |
| 1517 // trapping two or more times, they each get the blame for | |
| 1518 // all of their traps. | |
| 1519 make_not_entrant = true; | |
| 1520 } | |
| 1521 | |
| 1522 // Detect repeated recompilation at the same BCI, and enforce a limit. | |
| 1523 if (make_not_entrant && maybe_prior_recompile) { | |
| 1524 // More than one recompile at this point. | |
|
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1525 inc_recompile_count = maybe_prior_trap; |
| 0 | 1526 } |
| 1527 } else { | |
| 1528 // For reasons which are not recorded per-bytecode, we simply | |
| 1529 // force recompiles unconditionally. | |
| 1530 // (Note that PerMethodRecompilationCutoff is enforced elsewhere.) | |
| 1531 make_not_entrant = true; | |
| 1532 } | |
| 1533 | |
| 1534 // Go back to the compiler if there are too many traps in this method. | |
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1535 if (this_trap_count >= per_method_trap_limit(reason)) { |
| 0 | 1536 // If there are too many traps in this method, force a recompile. |
| 1537 // This will allow the compiler to see the limit overflow, and | |
| 1538 // take corrective action, if possible. | |
| 1539 // (This condition is an unlikely backstop only, because the | |
| 1540 // PerBytecodeTrapLimit is more likely to take effect first, | |
| 1541 // if it is applicable.) | |
| 1542 make_not_entrant = true; | |
| 1543 } | |
| 1544 | |
| 1545 // Here's more hysteresis: If there has been a recompile at | |
| 1546 // this trap point already, run the method in the interpreter | |
| 1547 // for a while to exercise it more thoroughly. | |
| 1548 if (make_not_entrant && maybe_prior_recompile && maybe_prior_trap) { | |
| 1783 | 1549 reprofile = true; |
| 0 | 1550 } |
| 1551 | |
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1552 } |
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1553 |
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1554 // Take requested actions on the method: |
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1555 |
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1556 // Recompile |
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1557 if (make_not_entrant) { |
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1558 if (!nm->make_not_entrant()) { |
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1559 return; // the call did not change nmethod's state |
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1560 } |
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1561 |
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1562 if (pdata != NULL) { |
| 0 | 1563 // Record the recompilation event, if any. |
| 1564 int tstate0 = pdata->trap_state(); | |
| 1565 int tstate1 = trap_state_set_recompiled(tstate0, true); | |
| 1566 if (tstate1 != tstate0) | |
| 1567 pdata->set_trap_state(tstate1); | |
| 1568 } | |
| 17780 | 1569 |
| 1570 #if INCLUDE_RTM_OPT | |
| 1571 // Restart collecting RTM locking abort statistic if the method | |
| 1572 // is recompiled for a reason other than RTM state change. | |
| 1573 // Assume that in new recompiled code the statistic could be different, | |
| 1574 // for example, due to different inlining. | |
| 1575 if ((reason != Reason_rtm_state_change) && (trap_mdo != NULL) && | |
| 1576 UseRTMDeopt && (nm->rtm_state() != ProfileRTM)) { | |
| 1577 trap_mdo->atomic_set_rtm_state(ProfileRTM); | |
| 1578 } | |
| 1579 #endif | |
| 0 | 1580 } |
| 1581 | |
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1582 if (inc_recompile_count) { |
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1583 trap_mdo->inc_overflow_recompile_count(); |
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1584 if ((uint)trap_mdo->overflow_recompile_count() > |
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1585 (uint)PerBytecodeRecompilationCutoff) { |
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1586 // Give up on the method containing the bad BCI. |
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1587 if (trap_method() == nm->method()) { |
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1588 make_not_compilable = true; |
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1589 } else { |
| 7998 | 1590 trap_method->set_not_compilable(CompLevel_full_optimization, true, "overflow_recompile_count > PerBytecodeRecompilationCutoff"); |
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1591 // But give grace to the enclosing nm->method(). |
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1592 } |
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1593 } |
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1594 } |
| 0 | 1595 |
| 1783 | 1596 // Reprofile |
| 1597 if (reprofile) { | |
| 1598 CompilationPolicy::policy()->reprofile(trap_scope, nm->is_osr_method()); | |
| 0 | 1599 } |
| 1600 | |
| 1601 // Give up compiling | |
| 1783 | 1602 if (make_not_compilable && !nm->method()->is_not_compilable(CompLevel_full_optimization)) { |
| 0 | 1603 assert(make_not_entrant, "consistent"); |
| 1783 | 1604 nm->method()->set_not_compilable(CompLevel_full_optimization); |
| 0 | 1605 } |
| 1606 | |
| 1607 } // Free marked resources | |
| 1608 | |
| 1609 } | |
| 1610 JRT_END | |
| 1611 | |
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1612 MethodData* |
| 0 | 1613 Deoptimization::get_method_data(JavaThread* thread, methodHandle m, |
| 1614 bool create_if_missing) { | |
| 1615 Thread* THREAD = thread; | |
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1616 MethodData* mdo = m()->method_data(); |
| 0 | 1617 if (mdo == NULL && create_if_missing && !HAS_PENDING_EXCEPTION) { |
| 1618 // Build an MDO. Ignore errors like OutOfMemory; | |
| 1619 // that simply means we won't have an MDO to update. | |
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1620 Method::build_interpreter_method_data(m, THREAD); |
| 0 | 1621 if (HAS_PENDING_EXCEPTION) { |
| 1622 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); | |
| 1623 CLEAR_PENDING_EXCEPTION; | |
| 1624 } | |
| 1625 mdo = m()->method_data(); | |
| 1626 } | |
| 1627 return mdo; | |
| 1628 } | |
| 1629 | |
| 1630 ProfileData* | |
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1631 Deoptimization::query_update_method_data(MethodData* trap_mdo, |
| 0 | 1632 int trap_bci, |
| 1633 Deoptimization::DeoptReason reason, | |
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1634 Method* compiled_method, |
| 0 | 1635 //outputs: |
| 1636 uint& ret_this_trap_count, | |
| 1637 bool& ret_maybe_prior_trap, | |
| 1638 bool& ret_maybe_prior_recompile) { | |
| 1639 uint prior_trap_count = trap_mdo->trap_count(reason); | |
| 1640 uint this_trap_count = trap_mdo->inc_trap_count(reason); | |
| 1641 | |
| 1642 // If the runtime cannot find a place to store trap history, | |
| 1643 // it is estimated based on the general condition of the method. | |
| 1644 // If the method has ever been recompiled, or has ever incurred | |
| 1645 // a trap with the present reason , then this BCI is assumed | |
| 1646 // (pessimistically) to be the culprit. | |
| 1647 bool maybe_prior_trap = (prior_trap_count != 0); | |
| 1648 bool maybe_prior_recompile = (trap_mdo->decompile_count() != 0); | |
| 1649 ProfileData* pdata = NULL; | |
| 1650 | |
| 1651 | |
| 1652 // For reasons which are recorded per bytecode, we check per-BCI data. | |
| 1653 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
| 1654 if (per_bc_reason != Reason_none) { | |
| 1655 // Find the profile data for this BCI. If there isn't one, | |
| 1656 // try to allocate one from the MDO's set of spares. | |
| 1657 // This will let us detect a repeated trap at this point. | |
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1658 pdata = trap_mdo->allocate_bci_to_data(trap_bci, reason_is_speculate(reason) ? compiled_method : NULL); |
| 0 | 1659 |
| 1660 if (pdata != NULL) { | |
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1661 if (reason_is_speculate(reason) && !pdata->is_SpeculativeTrapData()) { |
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1662 if (LogCompilation && xtty != NULL) { |
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1663 ttyLocker ttyl; |
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1664 // no more room for speculative traps in this MDO |
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1665 xtty->elem("speculative_traps_oom"); |
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1666 } |
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1667 } |
| 0 | 1668 // Query the trap state of this profile datum. |
| 1669 int tstate0 = pdata->trap_state(); | |
| 1670 if (!trap_state_has_reason(tstate0, per_bc_reason)) | |
| 1671 maybe_prior_trap = false; | |
| 1672 if (!trap_state_is_recompiled(tstate0)) | |
| 1673 maybe_prior_recompile = false; | |
| 1674 | |
| 1675 // Update the trap state of this profile datum. | |
| 1676 int tstate1 = tstate0; | |
| 1677 // Record the reason. | |
| 1678 tstate1 = trap_state_add_reason(tstate1, per_bc_reason); | |
| 1679 // Store the updated state on the MDO, for next time. | |
| 1680 if (tstate1 != tstate0) | |
| 1681 pdata->set_trap_state(tstate1); | |
| 1682 } else { | |
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1683 if (LogCompilation && xtty != NULL) { |
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1684 ttyLocker ttyl; |
| 0 | 1685 // Missing MDP? Leave a small complaint in the log. |
| 1686 xtty->elem("missing_mdp bci='%d'", trap_bci); | |
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1687 } |
| 0 | 1688 } |
| 1689 } | |
| 1690 | |
| 1691 // Return results: | |
| 1692 ret_this_trap_count = this_trap_count; | |
| 1693 ret_maybe_prior_trap = maybe_prior_trap; | |
| 1694 ret_maybe_prior_recompile = maybe_prior_recompile; | |
| 1695 return pdata; | |
| 1696 } | |
| 1697 | |
| 1698 void | |
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1699 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
| 0 | 1700 ResourceMark rm; |
| 1701 // Ignored outputs: | |
| 1702 uint ignore_this_trap_count; | |
| 1703 bool ignore_maybe_prior_trap; | |
| 1704 bool ignore_maybe_prior_recompile; | |
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1705 assert(!reason_is_speculate(reason), "reason speculate only used by compiler"); |
| 0 | 1706 query_update_method_data(trap_mdo, trap_bci, |
| 1707 (DeoptReason)reason, | |
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1708 NULL, |
| 0 | 1709 ignore_this_trap_count, |
| 1710 ignore_maybe_prior_trap, | |
| 1711 ignore_maybe_prior_recompile); | |
| 1712 } | |
| 1713 | |
| 1714 Deoptimization::UnrollBlock* Deoptimization::uncommon_trap(JavaThread* thread, jint trap_request) { | |
| 1715 | |
| 1716 // Still in Java no safepoints | |
| 1717 { | |
| 1718 // This enters VM and may safepoint | |
| 1719 uncommon_trap_inner(thread, trap_request); | |
| 1720 } | |
| 1721 return fetch_unroll_info_helper(thread); | |
| 1722 } | |
| 1723 | |
| 1724 // Local derived constants. | |
| 1725 // Further breakdown of DataLayout::trap_state, as promised by DataLayout. | |
| 1726 const int DS_REASON_MASK = DataLayout::trap_mask >> 1; | |
| 1727 const int DS_RECOMPILE_BIT = DataLayout::trap_mask - DS_REASON_MASK; | |
| 1728 | |
| 1729 //---------------------------trap_state_reason--------------------------------- | |
| 1730 Deoptimization::DeoptReason | |
| 1731 Deoptimization::trap_state_reason(int trap_state) { | |
| 1732 // This assert provides the link between the width of DataLayout::trap_bits | |
| 1733 // and the encoding of "recorded" reasons. It ensures there are enough | |
| 1734 // bits to store all needed reasons in the per-BCI MDO profile. | |
| 1735 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
| 1736 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
| 1737 trap_state -= recompile_bit; | |
| 1738 if (trap_state == DS_REASON_MASK) { | |
| 1739 return Reason_many; | |
| 1740 } else { | |
| 1741 assert((int)Reason_none == 0, "state=0 => Reason_none"); | |
| 1742 return (DeoptReason)trap_state; | |
| 1743 } | |
| 1744 } | |
| 1745 //-------------------------trap_state_has_reason------------------------------- | |
| 1746 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
| 1747 assert(reason_is_recorded_per_bytecode((DeoptReason)reason), "valid reason"); | |
| 1748 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
| 1749 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
| 1750 trap_state -= recompile_bit; | |
| 1751 if (trap_state == DS_REASON_MASK) { | |
| 1752 return -1; // true, unspecifically (bottom of state lattice) | |
| 1753 } else if (trap_state == reason) { | |
| 1754 return 1; // true, definitely | |
| 1755 } else if (trap_state == 0) { | |
| 1756 return 0; // false, definitely (top of state lattice) | |
| 1757 } else { | |
| 1758 return 0; // false, definitely | |
| 1759 } | |
| 1760 } | |
| 1761 //-------------------------trap_state_add_reason------------------------------- | |
| 1762 int Deoptimization::trap_state_add_reason(int trap_state, int reason) { | |
| 1763 assert(reason_is_recorded_per_bytecode((DeoptReason)reason) || reason == Reason_many, "valid reason"); | |
| 1764 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
| 1765 trap_state -= recompile_bit; | |
| 1766 if (trap_state == DS_REASON_MASK) { | |
| 1767 return trap_state + recompile_bit; // already at state lattice bottom | |
| 1768 } else if (trap_state == reason) { | |
| 1769 return trap_state + recompile_bit; // the condition is already true | |
| 1770 } else if (trap_state == 0) { | |
| 1771 return reason + recompile_bit; // no condition has yet been true | |
| 1772 } else { | |
| 1773 return DS_REASON_MASK + recompile_bit; // fall to state lattice bottom | |
| 1774 } | |
| 1775 } | |
| 1776 //-----------------------trap_state_is_recompiled------------------------------ | |
| 1777 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
| 1778 return (trap_state & DS_RECOMPILE_BIT) != 0; | |
| 1779 } | |
| 1780 //-----------------------trap_state_set_recompiled----------------------------- | |
| 1781 int Deoptimization::trap_state_set_recompiled(int trap_state, bool z) { | |
| 1782 if (z) return trap_state | DS_RECOMPILE_BIT; | |
| 1783 else return trap_state & ~DS_RECOMPILE_BIT; | |
| 1784 } | |
| 1785 //---------------------------format_trap_state--------------------------------- | |
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1786 // This is used for debugging and diagnostics, including LogFile output. |
| 0 | 1787 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, |
| 1788 int trap_state) { | |
| 1789 DeoptReason reason = trap_state_reason(trap_state); | |
| 1790 bool recomp_flag = trap_state_is_recompiled(trap_state); | |
| 1791 // Re-encode the state from its decoded components. | |
| 1792 int decoded_state = 0; | |
| 1793 if (reason_is_recorded_per_bytecode(reason) || reason == Reason_many) | |
| 1794 decoded_state = trap_state_add_reason(decoded_state, reason); | |
| 1795 if (recomp_flag) | |
| 1796 decoded_state = trap_state_set_recompiled(decoded_state, recomp_flag); | |
| 1797 // If the state re-encodes properly, format it symbolically. | |
| 1798 // Because this routine is used for debugging and diagnostics, | |
| 1799 // be robust even if the state is a strange value. | |
| 1800 size_t len; | |
| 1801 if (decoded_state != trap_state) { | |
| 1802 // Random buggy state that doesn't decode?? | |
| 1803 len = jio_snprintf(buf, buflen, "#%d", trap_state); | |
| 1804 } else { | |
| 1805 len = jio_snprintf(buf, buflen, "%s%s", | |
| 1806 trap_reason_name(reason), | |
| 1807 recomp_flag ? " recompiled" : ""); | |
| 1808 } | |
| 1809 if (len >= buflen) | |
| 1810 buf[buflen-1] = '\0'; | |
| 1811 return buf; | |
| 1812 } | |
| 1813 | |
| 1814 | |
| 1815 //--------------------------------statics-------------------------------------- | |
| 1816 Deoptimization::DeoptAction Deoptimization::_unloaded_action | |
| 1817 = Deoptimization::Action_reinterpret; | |
| 1818 const char* Deoptimization::_trap_reason_name[Reason_LIMIT] = { | |
| 1819 // Note: Keep this in sync. with enum DeoptReason. | |
| 1820 "none", | |
| 1821 "null_check", | |
| 1822 "null_assert", | |
| 1823 "range_check", | |
| 1824 "class_check", | |
| 1825 "array_check", | |
| 1826 "intrinsic", | |
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1827 "bimorphic", |
| 0 | 1828 "unloaded", |
| 1829 "uninitialized", | |
| 1830 "unreached", | |
| 1831 "unhandled", | |
| 1832 "constraint", | |
| 1833 "div0_check", | |
| 1172 | 1834 "age", |
| 3345 | 1835 "predicate", |
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1836 "loop_limit_check", |
| 17780 | 1837 "speculate_class_check", |
| 1838 "rtm_state_change" | |
| 0 | 1839 }; |
| 1840 const char* Deoptimization::_trap_action_name[Action_LIMIT] = { | |
| 1841 // Note: Keep this in sync. with enum DeoptAction. | |
| 1842 "none", | |
| 1843 "maybe_recompile", | |
| 1844 "reinterpret", | |
| 1845 "make_not_entrant", | |
| 1846 "make_not_compilable" | |
| 1847 }; | |
| 1848 | |
| 1849 const char* Deoptimization::trap_reason_name(int reason) { | |
| 1850 if (reason == Reason_many) return "many"; | |
| 1851 if ((uint)reason < Reason_LIMIT) | |
| 1852 return _trap_reason_name[reason]; | |
| 1853 static char buf[20]; | |
| 1854 sprintf(buf, "reason%d", reason); | |
| 1855 return buf; | |
| 1856 } | |
| 1857 const char* Deoptimization::trap_action_name(int action) { | |
| 1858 if ((uint)action < Action_LIMIT) | |
| 1859 return _trap_action_name[action]; | |
| 1860 static char buf[20]; | |
| 1861 sprintf(buf, "action%d", action); | |
| 1862 return buf; | |
| 1863 } | |
| 1864 | |
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1865 // This is used for debugging and diagnostics, including LogFile output. |
| 0 | 1866 const char* Deoptimization::format_trap_request(char* buf, size_t buflen, |
| 1867 int trap_request) { | |
| 1868 jint unloaded_class_index = trap_request_index(trap_request); | |
| 1869 const char* reason = trap_reason_name(trap_request_reason(trap_request)); | |
| 1870 const char* action = trap_action_name(trap_request_action(trap_request)); | |
| 1871 size_t len; | |
| 1872 if (unloaded_class_index < 0) { | |
| 1873 len = jio_snprintf(buf, buflen, "reason='%s' action='%s'", | |
| 1874 reason, action); | |
| 1875 } else { | |
| 1876 len = jio_snprintf(buf, buflen, "reason='%s' action='%s' index='%d'", | |
| 1877 reason, action, unloaded_class_index); | |
| 1878 } | |
| 1879 if (len >= buflen) | |
| 1880 buf[buflen-1] = '\0'; | |
| 1881 return buf; | |
| 1882 } | |
| 1883 | |
| 1884 juint Deoptimization::_deoptimization_hist | |
| 1885 [Deoptimization::Reason_LIMIT] | |
| 1886 [1 + Deoptimization::Action_LIMIT] | |
| 1887 [Deoptimization::BC_CASE_LIMIT] | |
| 1888 = {0}; | |
| 1889 | |
| 1890 enum { | |
| 1891 LSB_BITS = 8, | |
| 1892 LSB_MASK = right_n_bits(LSB_BITS) | |
| 1893 }; | |
| 1894 | |
| 1895 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
| 1896 Bytecodes::Code bc) { | |
| 1897 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
| 1898 assert(action >= 0 && action < Action_LIMIT, "oob"); | |
| 1899 _deoptimization_hist[Reason_none][0][0] += 1; // total | |
| 1900 _deoptimization_hist[reason][0][0] += 1; // per-reason total | |
| 1901 juint* cases = _deoptimization_hist[reason][1+action]; | |
| 1902 juint* bc_counter_addr = NULL; | |
| 1903 juint bc_counter = 0; | |
| 1904 // Look for an unused counter, or an exact match to this BC. | |
| 1905 if (bc != Bytecodes::_illegal) { | |
| 1906 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
| 1907 juint* counter_addr = &cases[bc_case]; | |
| 1908 juint counter = *counter_addr; | |
| 1909 if ((counter == 0 && bc_counter_addr == NULL) | |
| 1910 || (Bytecodes::Code)(counter & LSB_MASK) == bc) { | |
| 1911 // this counter is either free or is already devoted to this BC | |
| 1912 bc_counter_addr = counter_addr; | |
| 1913 bc_counter = counter | bc; | |
| 1914 } | |
| 1915 } | |
| 1916 } | |
| 1917 if (bc_counter_addr == NULL) { | |
| 1918 // Overflow, or no given bytecode. | |
| 1919 bc_counter_addr = &cases[BC_CASE_LIMIT-1]; | |
| 1920 bc_counter = (*bc_counter_addr & ~LSB_MASK); // clear LSB | |
| 1921 } | |
| 1922 *bc_counter_addr = bc_counter + (1 << LSB_BITS); | |
| 1923 } | |
| 1924 | |
| 1925 jint Deoptimization::total_deoptimization_count() { | |
| 1926 return _deoptimization_hist[Reason_none][0][0]; | |
| 1927 } | |
| 1928 | |
| 1929 jint Deoptimization::deoptimization_count(DeoptReason reason) { | |
| 1930 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
| 1931 return _deoptimization_hist[reason][0][0]; | |
| 1932 } | |
| 1933 | |
| 1934 void Deoptimization::print_statistics() { | |
| 1935 juint total = total_deoptimization_count(); | |
| 1936 juint account = total; | |
| 1937 if (total != 0) { | |
| 1938 ttyLocker ttyl; | |
| 1939 if (xtty != NULL) xtty->head("statistics type='deoptimization'"); | |
| 1940 tty->print_cr("Deoptimization traps recorded:"); | |
| 1941 #define PRINT_STAT_LINE(name, r) \ | |
| 1942 tty->print_cr(" %4d (%4.1f%%) %s", (int)(r), ((r) * 100.0) / total, name); | |
| 1943 PRINT_STAT_LINE("total", total); | |
| 1944 // For each non-zero entry in the histogram, print the reason, | |
| 1945 // the action, and (if specifically known) the type of bytecode. | |
| 1946 for (int reason = 0; reason < Reason_LIMIT; reason++) { | |
| 1947 for (int action = 0; action < Action_LIMIT; action++) { | |
| 1948 juint* cases = _deoptimization_hist[reason][1+action]; | |
| 1949 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
| 1950 juint counter = cases[bc_case]; | |
| 1951 if (counter != 0) { | |
| 1952 char name[1*K]; | |
| 1953 Bytecodes::Code bc = (Bytecodes::Code)(counter & LSB_MASK); | |
| 1954 if (bc_case == BC_CASE_LIMIT && (int)bc == 0) | |
| 1955 bc = Bytecodes::_illegal; | |
| 1956 sprintf(name, "%s/%s/%s", | |
| 1957 trap_reason_name(reason), | |
| 1958 trap_action_name(action), | |
| 1959 Bytecodes::is_defined(bc)? Bytecodes::name(bc): "other"); | |
| 1960 juint r = counter >> LSB_BITS; | |
| 1961 tty->print_cr(" %40s: " UINT32_FORMAT " (%.1f%%)", name, r, (r * 100.0) / total); | |
| 1962 account -= r; | |
| 1963 } | |
| 1964 } | |
| 1965 } | |
| 1966 } | |
| 1967 if (account != 0) { | |
| 1968 PRINT_STAT_LINE("unaccounted", account); | |
| 1969 } | |
| 1970 #undef PRINT_STAT_LINE | |
| 1971 if (xtty != NULL) xtty->tail("statistics"); | |
| 1972 } | |
| 1973 } | |
| 1692 | 1974 #else // COMPILER2 || SHARK |
| 0 | 1975 |
| 1976 | |
| 1977 // Stubs for C1 only system. | |
| 1978 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
| 1979 return false; | |
| 1980 } | |
| 1981 | |
| 1982 const char* Deoptimization::trap_reason_name(int reason) { | |
| 1983 return "unknown"; | |
| 1984 } | |
| 1985 | |
| 1986 void Deoptimization::print_statistics() { | |
| 1987 // no output | |
| 1988 } | |
| 1989 | |
| 1990 void | |
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1991 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
| 0 | 1992 // no udpate |
| 1993 } | |
| 1994 | |
| 1995 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
| 1996 return 0; | |
| 1997 } | |
| 1998 | |
| 1999 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
| 2000 Bytecodes::Code bc) { | |
| 2001 // no update | |
| 2002 } | |
| 2003 | |
| 2004 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
| 2005 int trap_state) { | |
| 2006 jio_snprintf(buf, buflen, "#%d", trap_state); | |
| 2007 return buf; | |
| 2008 } | |
| 2009 | |
| 1692 | 2010 #endif // COMPILER2 || SHARK |