Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.cpp @ 12144:d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
Summary: don't re-evaluate stack bounds for main thread before install guard page
Reviewed-by: coleenp, dholmes, dlong
| author | dsamersoff |
|---|---|
| date | Thu, 29 Aug 2013 21:48:23 +0400 |
| parents | 28e5aed7f3a6 |
| children | 836a62f43af9 01b268b3080a b5c8a61d7fa0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "code/debugInfoRec.hpp" | |
| 28 #include "code/nmethod.hpp" | |
| 29 #include "code/pcDesc.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "interpreter/bytecode.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/oopMapCache.hpp" | |
| 34 #include "memory/allocation.inline.hpp" | |
| 35 #include "memory/oopFactory.hpp" | |
| 36 #include "memory/resourceArea.hpp" | |
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37 #include "oops/method.hpp" |
| 1972 | 38 #include "oops/oop.inline.hpp" |
| 39 #include "prims/jvmtiThreadState.hpp" | |
| 40 #include "runtime/biasedLocking.hpp" | |
| 41 #include "runtime/compilationPolicy.hpp" | |
| 42 #include "runtime/deoptimization.hpp" | |
| 43 #include "runtime/interfaceSupport.hpp" | |
| 44 #include "runtime/sharedRuntime.hpp" | |
| 45 #include "runtime/signature.hpp" | |
| 46 #include "runtime/stubRoutines.hpp" | |
| 47 #include "runtime/thread.hpp" | |
| 48 #include "runtime/vframe.hpp" | |
| 49 #include "runtime/vframeArray.hpp" | |
| 50 #include "runtime/vframe_hp.hpp" | |
| 51 #include "utilities/events.hpp" | |
| 52 #include "utilities/xmlstream.hpp" | |
| 53 #ifdef TARGET_ARCH_x86 | |
| 54 # include "vmreg_x86.inline.hpp" | |
| 55 #endif | |
| 56 #ifdef TARGET_ARCH_sparc | |
| 57 # include "vmreg_sparc.inline.hpp" | |
| 58 #endif | |
| 59 #ifdef TARGET_ARCH_zero | |
| 60 # include "vmreg_zero.inline.hpp" | |
| 61 #endif | |
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62 #ifdef TARGET_ARCH_arm |
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63 # include "vmreg_arm.inline.hpp" |
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64 #endif |
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65 #ifdef TARGET_ARCH_ppc |
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66 # include "vmreg_ppc.inline.hpp" |
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67 #endif |
| 1972 | 68 #ifdef COMPILER2 |
| 69 #ifdef TARGET_ARCH_MODEL_x86_32 | |
| 70 # include "adfiles/ad_x86_32.hpp" | |
| 71 #endif | |
| 72 #ifdef TARGET_ARCH_MODEL_x86_64 | |
| 73 # include "adfiles/ad_x86_64.hpp" | |
| 74 #endif | |
| 75 #ifdef TARGET_ARCH_MODEL_sparc | |
| 76 # include "adfiles/ad_sparc.hpp" | |
| 77 #endif | |
| 78 #ifdef TARGET_ARCH_MODEL_zero | |
| 79 # include "adfiles/ad_zero.hpp" | |
| 80 #endif | |
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81 #ifdef TARGET_ARCH_MODEL_arm |
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82 # include "adfiles/ad_arm.hpp" |
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83 #endif |
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84 #ifdef TARGET_ARCH_MODEL_ppc |
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85 # include "adfiles/ad_ppc.hpp" |
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86 #endif |
| 1972 | 87 #endif |
| 0 | 88 |
| 89 bool DeoptimizationMarker::_is_active = false; | |
| 90 | |
| 91 Deoptimization::UnrollBlock::UnrollBlock(int size_of_deoptimized_frame, | |
| 92 int caller_adjustment, | |
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93 int caller_actual_parameters, |
| 0 | 94 int number_of_frames, |
| 95 intptr_t* frame_sizes, | |
| 96 address* frame_pcs, | |
| 97 BasicType return_type) { | |
| 98 _size_of_deoptimized_frame = size_of_deoptimized_frame; | |
| 99 _caller_adjustment = caller_adjustment; | |
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100 _caller_actual_parameters = caller_actual_parameters; |
| 0 | 101 _number_of_frames = number_of_frames; |
| 102 _frame_sizes = frame_sizes; | |
| 103 _frame_pcs = frame_pcs; | |
| 6197 | 104 _register_block = NEW_C_HEAP_ARRAY(intptr_t, RegisterMap::reg_count * 2, mtCompiler); |
| 0 | 105 _return_type = return_type; |
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106 _initial_info = 0; |
| 0 | 107 // PD (x86 only) |
| 108 _counter_temp = 0; | |
| 109 _unpack_kind = 0; | |
| 110 _sender_sp_temp = 0; | |
| 111 | |
| 112 _total_frame_sizes = size_of_frames(); | |
| 113 } | |
| 114 | |
| 115 | |
| 116 Deoptimization::UnrollBlock::~UnrollBlock() { | |
| 6197 | 117 FREE_C_HEAP_ARRAY(intptr_t, _frame_sizes, mtCompiler); |
| 118 FREE_C_HEAP_ARRAY(intptr_t, _frame_pcs, mtCompiler); | |
| 119 FREE_C_HEAP_ARRAY(intptr_t, _register_block, mtCompiler); | |
| 0 | 120 } |
| 121 | |
| 122 | |
| 123 intptr_t* Deoptimization::UnrollBlock::value_addr_at(int register_number) const { | |
| 124 assert(register_number < RegisterMap::reg_count, "checking register number"); | |
| 125 return &_register_block[register_number * 2]; | |
| 126 } | |
| 127 | |
| 128 | |
| 129 | |
| 130 int Deoptimization::UnrollBlock::size_of_frames() const { | |
| 131 // Acount first for the adjustment of the initial frame | |
| 132 int result = _caller_adjustment; | |
| 133 for (int index = 0; index < number_of_frames(); index++) { | |
| 134 result += frame_sizes()[index]; | |
| 135 } | |
| 136 return result; | |
| 137 } | |
| 138 | |
| 139 | |
| 140 void Deoptimization::UnrollBlock::print() { | |
| 141 ttyLocker ttyl; | |
| 142 tty->print_cr("UnrollBlock"); | |
| 143 tty->print_cr(" size_of_deoptimized_frame = %d", _size_of_deoptimized_frame); | |
| 144 tty->print( " frame_sizes: "); | |
| 145 for (int index = 0; index < number_of_frames(); index++) { | |
| 146 tty->print("%d ", frame_sizes()[index]); | |
| 147 } | |
| 148 tty->cr(); | |
| 149 } | |
| 150 | |
| 151 | |
| 152 // In order to make fetch_unroll_info work properly with escape | |
| 153 // analysis, The method was changed from JRT_LEAF to JRT_BLOCK_ENTRY and | |
| 154 // ResetNoHandleMark and HandleMark were removed from it. The actual reallocation | |
| 155 // of previously eliminated objects occurs in realloc_objects, which is | |
| 156 // called from the method fetch_unroll_info_helper below. | |
| 157 JRT_BLOCK_ENTRY(Deoptimization::UnrollBlock*, Deoptimization::fetch_unroll_info(JavaThread* thread)) | |
| 158 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
| 159 // but makes the entry a little slower. There is however a little dance we have to | |
| 160 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
| 161 | |
| 162 // fetch_unroll_info() is called at the beginning of the deoptimization | |
| 163 // handler. Note this fact before we start generating temporary frames | |
| 164 // that can confuse an asynchronous stack walker. This counter is | |
| 165 // decremented at the end of unpack_frames(). | |
| 166 thread->inc_in_deopt_handler(); | |
| 167 | |
| 168 return fetch_unroll_info_helper(thread); | |
| 169 JRT_END | |
| 170 | |
| 171 | |
| 172 // This is factored, since it is both called from a JRT_LEAF (deoptimization) and a JRT_ENTRY (uncommon_trap) | |
| 173 Deoptimization::UnrollBlock* Deoptimization::fetch_unroll_info_helper(JavaThread* thread) { | |
| 174 | |
| 175 // Note: there is a safepoint safety issue here. No matter whether we enter | |
| 176 // via vanilla deopt or uncommon trap we MUST NOT stop at a safepoint once | |
| 177 // the vframeArray is created. | |
| 178 // | |
| 179 | |
| 180 // Allocate our special deoptimization ResourceMark | |
| 181 DeoptResourceMark* dmark = new DeoptResourceMark(thread); | |
| 182 assert(thread->deopt_mark() == NULL, "Pending deopt!"); | |
| 183 thread->set_deopt_mark(dmark); | |
| 184 | |
| 185 frame stub_frame = thread->last_frame(); // Makes stack walkable as side effect | |
| 186 RegisterMap map(thread, true); | |
| 187 RegisterMap dummy_map(thread, false); | |
| 188 // Now get the deoptee with a valid map | |
| 189 frame deoptee = stub_frame.sender(&map); | |
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190 // Set the deoptee nmethod |
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191 assert(thread->deopt_nmethod() == NULL, "Pending deopt!"); |
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192 thread->set_deopt_nmethod(deoptee.cb()->as_nmethod_or_null()); |
| 0 | 193 |
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194 if (VerifyStack) { |
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195 thread->validate_frame_layout(); |
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196 } |
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197 |
| 0 | 198 // Create a growable array of VFrames where each VFrame represents an inlined |
| 199 // Java frame. This storage is allocated with the usual system arena. | |
| 200 assert(deoptee.is_compiled_frame(), "Wrong frame type"); | |
| 201 GrowableArray<compiledVFrame*>* chunk = new GrowableArray<compiledVFrame*>(10); | |
| 202 vframe* vf = vframe::new_vframe(&deoptee, &map, thread); | |
| 203 while (!vf->is_top()) { | |
| 204 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
| 205 chunk->push(compiledVFrame::cast(vf)); | |
| 206 vf = vf->sender(); | |
| 207 } | |
| 208 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
| 209 chunk->push(compiledVFrame::cast(vf)); | |
| 210 | |
| 211 #ifdef COMPILER2 | |
| 212 // Reallocate the non-escaping objects and restore their fields. Then | |
| 213 // relock objects if synchronization on them was eliminated. | |
| 4777 | 214 if (DoEscapeAnalysis || EliminateNestedLocks) { |
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215 if (EliminateAllocations) { |
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216 assert (chunk->at(0)->scope() != NULL,"expect only compiled java frames"); |
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217 GrowableArray<ScopeValue*>* objects = chunk->at(0)->scope()->objects(); |
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218 |
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219 // The flag return_oop() indicates call sites which return oop |
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220 // in compiled code. Such sites include java method calls, |
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221 // runtime calls (for example, used to allocate new objects/arrays |
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222 // on slow code path) and any other calls generated in compiled code. |
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223 // It is not guaranteed that we can get such information here only |
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224 // by analyzing bytecode in deoptimized frames. This is why this flag |
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225 // is set during method compilation (see Compile::Process_OopMap_Node()). |
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226 bool save_oop_result = chunk->at(0)->scope()->return_oop(); |
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227 Handle return_value; |
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228 if (save_oop_result) { |
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229 // Reallocation may trigger GC. If deoptimization happened on return from |
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230 // call which returns oop we need to save it since it is not in oopmap. |
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231 oop result = deoptee.saved_oop_result(&map); |
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232 assert(result == NULL || result->is_oop(), "must be oop"); |
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233 return_value = Handle(thread, result); |
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234 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); |
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235 if (TraceDeoptimization) { |
| 6843 | 236 ttyLocker ttyl; |
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237 tty->print_cr("SAVED OOP RESULT " INTPTR_FORMAT " in thread " INTPTR_FORMAT, result, thread); |
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238 } |
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239 } |
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240 bool reallocated = false; |
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241 if (objects != NULL) { |
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242 JRT_BLOCK |
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243 reallocated = realloc_objects(thread, &deoptee, objects, THREAD); |
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244 JRT_END |
| 0 | 245 } |
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246 if (reallocated) { |
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247 reassign_fields(&deoptee, &map, objects); |
| 0 | 248 #ifndef PRODUCT |
| 249 if (TraceDeoptimization) { | |
| 250 ttyLocker ttyl; | |
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251 tty->print_cr("REALLOC OBJECTS in thread " INTPTR_FORMAT, thread); |
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252 print_objects(objects); |
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253 } |
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254 #endif |
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255 } |
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256 if (save_oop_result) { |
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257 // Restore result. |
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258 deoptee.set_saved_oop_result(&map, return_value()); |
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259 } |
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260 } |
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261 if (EliminateLocks) { |
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262 #ifndef PRODUCT |
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263 bool first = true; |
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264 #endif |
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265 for (int i = 0; i < chunk->length(); i++) { |
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266 compiledVFrame* cvf = chunk->at(i); |
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267 assert (cvf->scope() != NULL,"expect only compiled java frames"); |
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268 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); |
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269 if (monitors->is_nonempty()) { |
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270 relock_objects(monitors, thread); |
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271 #ifndef PRODUCT |
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272 if (TraceDeoptimization) { |
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273 ttyLocker ttyl; |
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274 for (int j = 0; j < monitors->length(); j++) { |
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275 MonitorInfo* mi = monitors->at(j); |
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276 if (mi->eliminated()) { |
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277 if (first) { |
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278 first = false; |
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279 tty->print_cr("RELOCK OBJECTS in thread " INTPTR_FORMAT, thread); |
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280 } |
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281 tty->print_cr(" object <" INTPTR_FORMAT "> locked", mi->owner()); |
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282 } |
| 0 | 283 } |
| 284 } | |
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285 #endif |
| 0 | 286 } |
| 287 } | |
| 288 } | |
| 289 } | |
| 290 #endif // COMPILER2 | |
| 291 // Ensure that no safepoint is taken after pointers have been stored | |
| 292 // in fields of rematerialized objects. If a safepoint occurs from here on | |
| 293 // out the java state residing in the vframeArray will be missed. | |
| 294 No_Safepoint_Verifier no_safepoint; | |
| 295 | |
| 296 vframeArray* array = create_vframeArray(thread, deoptee, &map, chunk); | |
| 297 | |
| 298 assert(thread->vframe_array_head() == NULL, "Pending deopt!");; | |
| 299 thread->set_vframe_array_head(array); | |
| 300 | |
| 301 // Now that the vframeArray has been created if we have any deferred local writes | |
| 302 // added by jvmti then we can free up that structure as the data is now in the | |
| 303 // vframeArray | |
| 304 | |
| 305 if (thread->deferred_locals() != NULL) { | |
| 306 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread->deferred_locals(); | |
| 307 int i = 0; | |
| 308 do { | |
| 309 // Because of inlining we could have multiple vframes for a single frame | |
| 310 // and several of the vframes could have deferred writes. Find them all. | |
| 311 if (list->at(i)->id() == array->original().id()) { | |
| 312 jvmtiDeferredLocalVariableSet* dlv = list->at(i); | |
| 313 list->remove_at(i); | |
| 314 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 315 delete dlv; | |
| 316 } else { | |
| 317 i++; | |
| 318 } | |
| 319 } while ( i < list->length() ); | |
| 320 if (list->length() == 0) { | |
| 321 thread->set_deferred_locals(NULL); | |
| 322 // free the list and elements back to C heap. | |
| 323 delete list; | |
| 324 } | |
| 325 | |
| 326 } | |
| 327 | |
| 1692 | 328 #ifndef SHARK |
| 0 | 329 // Compute the caller frame based on the sender sp of stub_frame and stored frame sizes info. |
| 330 CodeBlob* cb = stub_frame.cb(); | |
| 331 // Verify we have the right vframeArray | |
| 332 assert(cb->frame_size() >= 0, "Unexpected frame size"); | |
| 333 intptr_t* unpack_sp = stub_frame.sp() + cb->frame_size(); | |
| 334 | |
| 1204 | 335 // If the deopt call site is a MethodHandle invoke call site we have |
| 336 // to adjust the unpack_sp. | |
| 337 nmethod* deoptee_nm = deoptee.cb()->as_nmethod_or_null(); | |
| 338 if (deoptee_nm != NULL && deoptee_nm->is_method_handle_return(deoptee.pc())) | |
| 339 unpack_sp = deoptee.unextended_sp(); | |
| 340 | |
| 0 | 341 #ifdef ASSERT |
| 342 assert(cb->is_deoptimization_stub() || cb->is_uncommon_trap_stub(), "just checking"); | |
| 343 #endif | |
| 1692 | 344 #else |
| 345 intptr_t* unpack_sp = stub_frame.sender(&dummy_map).unextended_sp(); | |
| 346 #endif // !SHARK | |
| 347 | |
| 0 | 348 // This is a guarantee instead of an assert because if vframe doesn't match |
| 349 // we will unpack the wrong deoptimized frame and wind up in strange places | |
| 350 // where it will be very difficult to figure out what went wrong. Better | |
| 351 // to die an early death here than some very obscure death later when the | |
| 352 // trail is cold. | |
| 353 // Note: on ia64 this guarantee can be fooled by frames with no memory stack | |
| 354 // in that it will fail to detect a problem when there is one. This needs | |
| 355 // more work in tiger timeframe. | |
| 356 guarantee(array->unextended_sp() == unpack_sp, "vframe_array_head must contain the vframeArray to unpack"); | |
| 357 | |
| 358 int number_of_frames = array->frames(); | |
| 359 | |
| 360 // Compute the vframes' sizes. Note that frame_sizes[] entries are ordered from outermost to innermost | |
| 361 // virtual activation, which is the reverse of the elements in the vframes array. | |
| 6197 | 362 intptr_t* frame_sizes = NEW_C_HEAP_ARRAY(intptr_t, number_of_frames, mtCompiler); |
| 0 | 363 // +1 because we always have an interpreter return address for the final slot. |
| 6197 | 364 address* frame_pcs = NEW_C_HEAP_ARRAY(address, number_of_frames + 1, mtCompiler); |
| 0 | 365 int popframe_extra_args = 0; |
| 366 // Create an interpreter return address for the stub to use as its return | |
| 367 // address so the skeletal frames are perfectly walkable | |
| 368 frame_pcs[number_of_frames] = Interpreter::deopt_entry(vtos, 0); | |
| 369 | |
| 370 // PopFrame requires that the preserved incoming arguments from the recently-popped topmost | |
| 371 // activation be put back on the expression stack of the caller for reexecution | |
| 372 if (JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) { | |
| 373 popframe_extra_args = in_words(thread->popframe_preserved_args_size_in_words()); | |
| 374 } | |
| 375 | |
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376 // Find the current pc for sender of the deoptee. Since the sender may have been deoptimized |
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377 // itself since the deoptee vframeArray was created we must get a fresh value of the pc rather |
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378 // than simply use array->sender.pc(). This requires us to walk the current set of frames |
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379 // |
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380 frame deopt_sender = stub_frame.sender(&dummy_map); // First is the deoptee frame |
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381 deopt_sender = deopt_sender.sender(&dummy_map); // Now deoptee caller |
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382 |
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383 // It's possible that the number of paramters at the call site is |
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384 // different than number of arguments in the callee when method |
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385 // handles are used. If the caller is interpreted get the real |
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386 // value so that the proper amount of space can be added to it's |
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387 // frame. |
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388 bool caller_was_method_handle = false; |
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389 if (deopt_sender.is_interpreted_frame()) { |
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390 methodHandle method = deopt_sender.interpreter_frame_method(); |
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391 Bytecode_invoke cur = Bytecode_invoke_check(method, deopt_sender.interpreter_frame_bci()); |
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392 if (cur.is_invokedynamic() || cur.is_invokehandle()) { |
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393 // Method handle invokes may involve fairly arbitrary chains of |
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394 // calls so it's impossible to know how much actual space the |
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395 // caller has for locals. |
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396 caller_was_method_handle = true; |
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397 } |
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398 } |
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399 |
| 0 | 400 // |
| 401 // frame_sizes/frame_pcs[0] oldest frame (int or c2i) | |
| 402 // frame_sizes/frame_pcs[1] next oldest frame (int) | |
| 403 // frame_sizes/frame_pcs[n] youngest frame (int) | |
| 404 // | |
| 405 // Now a pc in frame_pcs is actually the return address to the frame's caller (a frame | |
| 406 // owns the space for the return address to it's caller). Confusing ain't it. | |
| 407 // | |
| 408 // The vframe array can address vframes with indices running from | |
| 409 // 0.._frames-1. Index 0 is the youngest frame and _frame - 1 is the oldest (root) frame. | |
| 410 // When we create the skeletal frames we need the oldest frame to be in the zero slot | |
| 411 // in the frame_sizes/frame_pcs so the assembly code can do a trivial walk. | |
| 412 // so things look a little strange in this loop. | |
| 413 // | |
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414 int callee_parameters = 0; |
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415 int callee_locals = 0; |
| 0 | 416 for (int index = 0; index < array->frames(); index++ ) { |
| 417 // frame[number_of_frames - 1 ] = on_stack_size(youngest) | |
| 418 // frame[number_of_frames - 2 ] = on_stack_size(sender(youngest)) | |
| 419 // frame[number_of_frames - 3 ] = on_stack_size(sender(sender(youngest))) | |
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420 int caller_parms = callee_parameters; |
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421 if ((index == array->frames() - 1) && caller_was_method_handle) { |
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422 caller_parms = 0; |
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423 } |
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424 frame_sizes[number_of_frames - 1 - index] = BytesPerWord * array->element(index)->on_stack_size(caller_parms, |
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425 callee_parameters, |
| 0 | 426 callee_locals, |
| 427 index == 0, | |
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428 index == array->frames() - 1, |
| 0 | 429 popframe_extra_args); |
| 430 // This pc doesn't have to be perfect just good enough to identify the frame | |
| 431 // as interpreted so the skeleton frame will be walkable | |
| 432 // The correct pc will be set when the skeleton frame is completely filled out | |
| 433 // The final pc we store in the loop is wrong and will be overwritten below | |
| 434 frame_pcs[number_of_frames - 1 - index ] = Interpreter::deopt_entry(vtos, 0) - frame::pc_return_offset; | |
| 435 | |
| 436 callee_parameters = array->element(index)->method()->size_of_parameters(); | |
| 437 callee_locals = array->element(index)->method()->max_locals(); | |
| 438 popframe_extra_args = 0; | |
| 439 } | |
| 440 | |
| 441 // Compute whether the root vframe returns a float or double value. | |
| 442 BasicType return_type; | |
| 443 { | |
| 444 HandleMark hm; | |
| 445 methodHandle method(thread, array->element(0)->method()); | |
| 2142 | 446 Bytecode_invoke invoke = Bytecode_invoke_check(method, array->element(0)->bci()); |
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447 return_type = invoke.is_valid() ? invoke.result_type() : T_ILLEGAL; |
| 0 | 448 } |
| 449 | |
| 450 // Compute information for handling adapters and adjusting the frame size of the caller. | |
| 451 int caller_adjustment = 0; | |
| 452 | |
| 453 // Compute the amount the oldest interpreter frame will have to adjust | |
| 454 // its caller's stack by. If the caller is a compiled frame then | |
| 455 // we pretend that the callee has no parameters so that the | |
| 456 // extension counts for the full amount of locals and not just | |
| 457 // locals-parms. This is because without a c2i adapter the parm | |
| 458 // area as created by the compiled frame will not be usable by | |
| 459 // the interpreter. (Depending on the calling convention there | |
| 460 // may not even be enough space). | |
| 461 | |
| 462 // QQQ I'd rather see this pushed down into last_frame_adjust | |
| 463 // and have it take the sender (aka caller). | |
| 464 | |
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465 if (deopt_sender.is_compiled_frame() || caller_was_method_handle) { |
| 0 | 466 caller_adjustment = last_frame_adjust(0, callee_locals); |
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467 } else if (callee_locals > callee_parameters) { |
| 0 | 468 // The caller frame may need extending to accommodate |
| 469 // non-parameter locals of the first unpacked interpreted frame. | |
| 470 // Compute that adjustment. | |
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471 caller_adjustment = last_frame_adjust(callee_parameters, callee_locals); |
| 0 | 472 } |
| 473 | |
| 474 // If the sender is deoptimized the we must retrieve the address of the handler | |
| 475 // since the frame will "magically" show the original pc before the deopt | |
| 476 // and we'd undo the deopt. | |
| 477 | |
| 478 frame_pcs[0] = deopt_sender.raw_pc(); | |
| 479 | |
| 1692 | 480 #ifndef SHARK |
| 0 | 481 assert(CodeCache::find_blob_unsafe(frame_pcs[0]) != NULL, "bad pc"); |
| 1692 | 482 #endif // SHARK |
| 0 | 483 |
| 484 UnrollBlock* info = new UnrollBlock(array->frame_size() * BytesPerWord, | |
| 485 caller_adjustment * BytesPerWord, | |
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486 caller_was_method_handle ? 0 : callee_parameters, |
| 0 | 487 number_of_frames, |
| 488 frame_sizes, | |
| 489 frame_pcs, | |
| 490 return_type); | |
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491 // On some platforms, we need a way to pass some platform dependent |
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492 // information to the unpacking code so the skeletal frames come out |
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493 // correct (initial fp value, unextended sp, ...) |
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494 info->set_initial_info((intptr_t) array->sender().initial_deoptimization_info()); |
| 0 | 495 |
| 496 if (array->frames() > 1) { | |
| 497 if (VerifyStack && TraceDeoptimization) { | |
| 6843 | 498 ttyLocker ttyl; |
| 0 | 499 tty->print_cr("Deoptimizing method containing inlining"); |
| 500 } | |
| 501 } | |
| 502 | |
| 503 array->set_unroll_block(info); | |
| 504 return info; | |
| 505 } | |
| 506 | |
| 507 // Called to cleanup deoptimization data structures in normal case | |
| 508 // after unpacking to stack and when stack overflow error occurs | |
| 509 void Deoptimization::cleanup_deopt_info(JavaThread *thread, | |
| 510 vframeArray *array) { | |
| 511 | |
| 512 // Get array if coming from exception | |
| 513 if (array == NULL) { | |
| 514 array = thread->vframe_array_head(); | |
| 515 } | |
| 516 thread->set_vframe_array_head(NULL); | |
| 517 | |
| 518 // Free the previous UnrollBlock | |
| 519 vframeArray* old_array = thread->vframe_array_last(); | |
| 520 thread->set_vframe_array_last(array); | |
| 521 | |
| 522 if (old_array != NULL) { | |
| 523 UnrollBlock* old_info = old_array->unroll_block(); | |
| 524 old_array->set_unroll_block(NULL); | |
| 525 delete old_info; | |
| 526 delete old_array; | |
| 527 } | |
| 528 | |
| 529 // Deallocate any resource creating in this routine and any ResourceObjs allocated | |
| 530 // inside the vframeArray (StackValueCollections) | |
| 531 | |
| 532 delete thread->deopt_mark(); | |
| 533 thread->set_deopt_mark(NULL); | |
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534 thread->set_deopt_nmethod(NULL); |
| 0 | 535 |
| 536 | |
| 537 if (JvmtiExport::can_pop_frame()) { | |
| 538 #ifndef CC_INTERP | |
| 539 // Regardless of whether we entered this routine with the pending | |
| 540 // popframe condition bit set, we should always clear it now | |
| 541 thread->clear_popframe_condition(); | |
| 542 #else | |
| 543 // C++ interpeter will clear has_pending_popframe when it enters | |
| 544 // with method_resume. For deopt_resume2 we clear it now. | |
| 545 if (thread->popframe_forcing_deopt_reexecution()) | |
| 546 thread->clear_popframe_condition(); | |
| 547 #endif /* CC_INTERP */ | |
| 548 } | |
| 549 | |
| 550 // unpack_frames() is called at the end of the deoptimization handler | |
| 551 // and (in C2) at the end of the uncommon trap handler. Note this fact | |
| 552 // so that an asynchronous stack walker can work again. This counter is | |
| 553 // incremented at the beginning of fetch_unroll_info() and (in C2) at | |
| 554 // the beginning of uncommon_trap(). | |
| 555 thread->dec_in_deopt_handler(); | |
| 556 } | |
| 557 | |
| 558 | |
| 559 // Return BasicType of value being returned | |
| 560 JRT_LEAF(BasicType, Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)) | |
| 561 | |
| 562 // We are already active int he special DeoptResourceMark any ResourceObj's we | |
| 563 // allocate will be freed at the end of the routine. | |
| 564 | |
| 565 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
| 566 // but makes the entry a little slower. There is however a little dance we have to | |
| 567 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
| 568 ResetNoHandleMark rnhm; // No-op in release/product versions | |
| 569 HandleMark hm; | |
| 570 | |
| 571 frame stub_frame = thread->last_frame(); | |
| 572 | |
| 573 // Since the frame to unpack is the top frame of this thread, the vframe_array_head | |
| 574 // must point to the vframeArray for the unpack frame. | |
| 575 vframeArray* array = thread->vframe_array_head(); | |
| 576 | |
| 577 #ifndef PRODUCT | |
| 578 if (TraceDeoptimization) { | |
| 6843 | 579 ttyLocker ttyl; |
| 0 | 580 tty->print_cr("DEOPT UNPACKING thread " INTPTR_FORMAT " vframeArray " INTPTR_FORMAT " mode %d", thread, array, exec_mode); |
| 581 } | |
| 582 #endif | |
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583 Events::log(thread, "DEOPT UNPACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT " mode %d", |
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584 stub_frame.pc(), stub_frame.sp(), exec_mode); |
| 0 | 585 |
| 586 UnrollBlock* info = array->unroll_block(); | |
| 587 | |
| 588 // Unpack the interpreter frames and any adapter frame (c2 only) we might create. | |
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589 array->unpack_to_stack(stub_frame, exec_mode, info->caller_actual_parameters()); |
| 0 | 590 |
| 591 BasicType bt = info->return_type(); | |
| 592 | |
| 593 // If we have an exception pending, claim that the return type is an oop | |
| 594 // so the deopt_blob does not overwrite the exception_oop. | |
| 595 | |
| 596 if (exec_mode == Unpack_exception) | |
| 597 bt = T_OBJECT; | |
| 598 | |
| 599 // Cleanup thread deopt data | |
| 600 cleanup_deopt_info(thread, array); | |
| 601 | |
| 602 #ifndef PRODUCT | |
| 603 if (VerifyStack) { | |
| 604 ResourceMark res_mark; | |
| 605 | |
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606 thread->validate_frame_layout(); |
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607 |
| 0 | 608 // Verify that the just-unpacked frames match the interpreter's |
| 609 // notions of expression stack and locals | |
| 610 vframeArray* cur_array = thread->vframe_array_last(); | |
| 611 RegisterMap rm(thread, false); | |
| 612 rm.set_include_argument_oops(false); | |
| 613 bool is_top_frame = true; | |
| 614 int callee_size_of_parameters = 0; | |
| 615 int callee_max_locals = 0; | |
| 616 for (int i = 0; i < cur_array->frames(); i++) { | |
| 617 vframeArrayElement* el = cur_array->element(i); | |
| 618 frame* iframe = el->iframe(); | |
| 619 guarantee(iframe->is_interpreted_frame(), "Wrong frame type"); | |
| 620 | |
| 621 // Get the oop map for this bci | |
| 622 InterpreterOopMap mask; | |
| 623 int cur_invoke_parameter_size = 0; | |
| 624 bool try_next_mask = false; | |
| 625 int next_mask_expression_stack_size = -1; | |
| 626 int top_frame_expression_stack_adjustment = 0; | |
| 627 methodHandle mh(thread, iframe->interpreter_frame_method()); | |
| 628 OopMapCache::compute_one_oop_map(mh, iframe->interpreter_frame_bci(), &mask); | |
| 629 BytecodeStream str(mh); | |
| 630 str.set_start(iframe->interpreter_frame_bci()); | |
| 631 int max_bci = mh->code_size(); | |
| 632 // Get to the next bytecode if possible | |
| 633 assert(str.bci() < max_bci, "bci in interpreter frame out of bounds"); | |
| 634 // Check to see if we can grab the number of outgoing arguments | |
| 635 // at an uncommon trap for an invoke (where the compiler | |
| 636 // generates debug info before the invoke has executed) | |
| 637 Bytecodes::Code cur_code = str.next(); | |
| 10390 | 638 if (cur_code == Bytecodes::_invokevirtual || |
| 639 cur_code == Bytecodes::_invokespecial || | |
| 640 cur_code == Bytecodes::_invokestatic || | |
| 641 cur_code == Bytecodes::_invokeinterface || | |
| 642 cur_code == Bytecodes::_invokedynamic) { | |
| 2142 | 643 Bytecode_invoke invoke(mh, iframe->interpreter_frame_bci()); |
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644 Symbol* signature = invoke.signature(); |
| 0 | 645 ArgumentSizeComputer asc(signature); |
| 646 cur_invoke_parameter_size = asc.size(); | |
| 10390 | 647 if (invoke.has_receiver()) { |
| 0 | 648 // Add in receiver |
| 649 ++cur_invoke_parameter_size; | |
| 650 } | |
| 10390 | 651 if (i != 0 && !invoke.is_invokedynamic() && MethodHandles::has_member_arg(invoke.klass(), invoke.name())) { |
| 652 callee_size_of_parameters++; | |
| 653 } | |
| 0 | 654 } |
| 655 if (str.bci() < max_bci) { | |
| 656 Bytecodes::Code bc = str.next(); | |
| 657 if (bc >= 0) { | |
| 658 // The interpreter oop map generator reports results before | |
| 659 // the current bytecode has executed except in the case of | |
| 660 // calls. It seems to be hard to tell whether the compiler | |
| 661 // has emitted debug information matching the "state before" | |
| 662 // a given bytecode or the state after, so we try both | |
| 663 switch (cur_code) { | |
| 664 case Bytecodes::_invokevirtual: | |
| 665 case Bytecodes::_invokespecial: | |
| 666 case Bytecodes::_invokestatic: | |
| 667 case Bytecodes::_invokeinterface: | |
| 10390 | 668 case Bytecodes::_invokedynamic: |
| 0 | 669 case Bytecodes::_athrow: |
| 670 break; | |
| 671 default: { | |
| 672 InterpreterOopMap next_mask; | |
| 673 OopMapCache::compute_one_oop_map(mh, str.bci(), &next_mask); | |
| 674 next_mask_expression_stack_size = next_mask.expression_stack_size(); | |
| 675 // Need to subtract off the size of the result type of | |
| 676 // the bytecode because this is not described in the | |
| 677 // debug info but returned to the interpreter in the TOS | |
| 678 // caching register | |
| 679 BasicType bytecode_result_type = Bytecodes::result_type(cur_code); | |
| 680 if (bytecode_result_type != T_ILLEGAL) { | |
| 681 top_frame_expression_stack_adjustment = type2size[bytecode_result_type]; | |
| 682 } | |
| 683 assert(top_frame_expression_stack_adjustment >= 0, ""); | |
| 684 try_next_mask = true; | |
| 685 break; | |
| 686 } | |
| 687 } | |
| 688 } | |
| 689 } | |
| 690 | |
| 691 // Verify stack depth and oops in frame | |
| 692 // This assertion may be dependent on the platform we're running on and may need modification (tested on x86 and sparc) | |
| 693 if (!( | |
| 694 /* SPARC */ | |
| 695 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_size_of_parameters) || | |
| 696 /* x86 */ | |
| 697 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_max_locals) || | |
| 698 (try_next_mask && | |
| 699 (iframe->interpreter_frame_expression_stack_size() == (next_mask_expression_stack_size - | |
| 700 top_frame_expression_stack_adjustment))) || | |
| 701 (is_top_frame && (exec_mode == Unpack_exception) && iframe->interpreter_frame_expression_stack_size() == 0) || | |
| 702 (is_top_frame && (exec_mode == Unpack_uncommon_trap || exec_mode == Unpack_reexecute) && | |
| 703 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + cur_invoke_parameter_size)) | |
| 704 )) { | |
| 705 ttyLocker ttyl; | |
| 706 | |
| 707 // Print out some information that will help us debug the problem | |
| 708 tty->print_cr("Wrong number of expression stack elements during deoptimization"); | |
| 709 tty->print_cr(" Error occurred while verifying frame %d (0..%d, 0 is topmost)", i, cur_array->frames() - 1); | |
| 710 tty->print_cr(" Fabricated interpreter frame had %d expression stack elements", | |
| 711 iframe->interpreter_frame_expression_stack_size()); | |
| 712 tty->print_cr(" Interpreter oop map had %d expression stack elements", mask.expression_stack_size()); | |
| 713 tty->print_cr(" try_next_mask = %d", try_next_mask); | |
| 714 tty->print_cr(" next_mask_expression_stack_size = %d", next_mask_expression_stack_size); | |
| 715 tty->print_cr(" callee_size_of_parameters = %d", callee_size_of_parameters); | |
| 716 tty->print_cr(" callee_max_locals = %d", callee_max_locals); | |
| 717 tty->print_cr(" top_frame_expression_stack_adjustment = %d", top_frame_expression_stack_adjustment); | |
| 718 tty->print_cr(" exec_mode = %d", exec_mode); | |
| 719 tty->print_cr(" cur_invoke_parameter_size = %d", cur_invoke_parameter_size); | |
| 720 tty->print_cr(" Thread = " INTPTR_FORMAT ", thread ID = " UINTX_FORMAT, thread, thread->osthread()->thread_id()); | |
| 721 tty->print_cr(" Interpreted frames:"); | |
| 722 for (int k = 0; k < cur_array->frames(); k++) { | |
| 723 vframeArrayElement* el = cur_array->element(k); | |
| 724 tty->print_cr(" %s (bci %d)", el->method()->name_and_sig_as_C_string(), el->bci()); | |
| 725 } | |
| 726 cur_array->print_on_2(tty); | |
| 727 guarantee(false, "wrong number of expression stack elements during deopt"); | |
| 728 } | |
| 729 VerifyOopClosure verify; | |
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730 iframe->oops_interpreted_do(&verify, NULL, &rm, false); |
| 0 | 731 callee_size_of_parameters = mh->size_of_parameters(); |
| 732 callee_max_locals = mh->max_locals(); | |
| 733 is_top_frame = false; | |
| 734 } | |
| 735 } | |
| 736 #endif /* !PRODUCT */ | |
| 737 | |
| 738 | |
| 739 return bt; | |
| 740 JRT_END | |
| 741 | |
| 742 | |
| 743 int Deoptimization::deoptimize_dependents() { | |
| 744 Threads::deoptimized_wrt_marked_nmethods(); | |
| 745 return 0; | |
| 746 } | |
| 747 | |
| 748 | |
| 749 #ifdef COMPILER2 | |
| 750 bool Deoptimization::realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS) { | |
| 751 Handle pending_exception(thread->pending_exception()); | |
| 752 const char* exception_file = thread->exception_file(); | |
| 753 int exception_line = thread->exception_line(); | |
| 754 thread->clear_pending_exception(); | |
| 755 | |
| 756 for (int i = 0; i < objects->length(); i++) { | |
| 757 assert(objects->at(i)->is_object(), "invalid debug information"); | |
| 758 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
| 759 | |
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760 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 761 oop obj = NULL; |
| 762 | |
| 763 if (k->oop_is_instance()) { | |
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764 InstanceKlass* ik = InstanceKlass::cast(k()); |
| 0 | 765 obj = ik->allocate_instance(CHECK_(false)); |
| 766 } else if (k->oop_is_typeArray()) { | |
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767 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
| 0 | 768 assert(sv->field_size() % type2size[ak->element_type()] == 0, "non-integral array length"); |
| 769 int len = sv->field_size() / type2size[ak->element_type()]; | |
| 770 obj = ak->allocate(len, CHECK_(false)); | |
| 771 } else if (k->oop_is_objArray()) { | |
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772 ObjArrayKlass* ak = ObjArrayKlass::cast(k()); |
| 0 | 773 obj = ak->allocate(sv->field_size(), CHECK_(false)); |
| 774 } | |
| 775 | |
| 776 assert(obj != NULL, "allocation failed"); | |
| 777 assert(sv->value().is_null(), "redundant reallocation"); | |
| 778 sv->set_value(obj); | |
| 779 } | |
| 780 | |
| 781 if (pending_exception.not_null()) { | |
| 782 thread->set_pending_exception(pending_exception(), exception_file, exception_line); | |
| 783 } | |
| 784 | |
| 785 return true; | |
| 786 } | |
| 787 | |
| 788 // This assumes that the fields are stored in ObjectValue in the same order | |
| 789 // they are yielded by do_nonstatic_fields. | |
| 790 class FieldReassigner: public FieldClosure { | |
| 791 frame* _fr; | |
| 792 RegisterMap* _reg_map; | |
| 793 ObjectValue* _sv; | |
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794 InstanceKlass* _ik; |
| 0 | 795 oop _obj; |
| 796 | |
| 797 int _i; | |
| 798 public: | |
| 799 FieldReassigner(frame* fr, RegisterMap* reg_map, ObjectValue* sv, oop obj) : | |
| 800 _fr(fr), _reg_map(reg_map), _sv(sv), _obj(obj), _i(0) {} | |
| 801 | |
| 802 int i() const { return _i; } | |
| 803 | |
| 804 | |
| 805 void do_field(fieldDescriptor* fd) { | |
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806 intptr_t val; |
| 0 | 807 StackValue* value = |
| 808 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(i())); | |
| 809 int offset = fd->offset(); | |
| 810 switch (fd->field_type()) { | |
| 811 case T_OBJECT: case T_ARRAY: | |
| 812 assert(value->type() == T_OBJECT, "Agreement."); | |
| 813 _obj->obj_field_put(offset, value->get_obj()()); | |
| 814 break; | |
| 815 | |
| 816 case T_LONG: case T_DOUBLE: { | |
| 817 assert(value->type() == T_INT, "Agreement."); | |
| 818 StackValue* low = | |
| 819 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(++_i)); | |
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820 #ifdef _LP64 |
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821 jlong res = (jlong)low->get_int(); |
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822 #else |
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823 #ifdef SPARC |
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824 // For SPARC we have to swap high and low words. |
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825 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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826 #else |
| 0 | 827 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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828 #endif //SPARC |
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829 #endif |
| 0 | 830 _obj->long_field_put(offset, res); |
| 831 break; | |
| 832 } | |
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833 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
| 0 | 834 case T_INT: case T_FLOAT: // 4 bytes. |
| 835 assert(value->type() == T_INT, "Agreement."); | |
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836 val = value->get_int(); |
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837 _obj->int_field_put(offset, (jint)*((jint*)&val)); |
| 0 | 838 break; |
| 839 | |
| 840 case T_SHORT: case T_CHAR: // 2 bytes | |
| 841 assert(value->type() == T_INT, "Agreement."); | |
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842 val = value->get_int(); |
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843 _obj->short_field_put(offset, (jshort)*((jint*)&val)); |
| 0 | 844 break; |
| 845 | |
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846 case T_BOOLEAN: case T_BYTE: // 1 byte |
| 0 | 847 assert(value->type() == T_INT, "Agreement."); |
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848 val = value->get_int(); |
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849 _obj->bool_field_put(offset, (jboolean)*((jint*)&val)); |
| 0 | 850 break; |
| 851 | |
| 852 default: | |
| 853 ShouldNotReachHere(); | |
| 854 } | |
| 855 _i++; | |
| 856 } | |
| 857 }; | |
| 858 | |
| 859 // restore elements of an eliminated type array | |
| 860 void Deoptimization::reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type) { | |
| 861 int index = 0; | |
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862 intptr_t val; |
| 0 | 863 |
| 864 for (int i = 0; i < sv->field_size(); i++) { | |
| 865 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
| 866 switch(type) { | |
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867 case T_LONG: case T_DOUBLE: { |
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868 assert(value->type() == T_INT, "Agreement."); |
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869 StackValue* low = |
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870 StackValue::create_stack_value(fr, reg_map, sv->field_at(++i)); |
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871 #ifdef _LP64 |
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872 jlong res = (jlong)low->get_int(); |
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873 #else |
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874 #ifdef SPARC |
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875 // For SPARC we have to swap high and low words. |
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876 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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877 #else |
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878 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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879 #endif //SPARC |
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880 #endif |
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881 obj->long_at_put(index, res); |
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882 break; |
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883 } |
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884 |
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885 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
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886 case T_INT: case T_FLOAT: // 4 bytes. |
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887 assert(value->type() == T_INT, "Agreement."); |
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888 val = value->get_int(); |
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889 obj->int_at_put(index, (jint)*((jint*)&val)); |
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890 break; |
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891 |
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892 case T_SHORT: case T_CHAR: // 2 bytes |
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893 assert(value->type() == T_INT, "Agreement."); |
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894 val = value->get_int(); |
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895 obj->short_at_put(index, (jshort)*((jint*)&val)); |
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896 break; |
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897 |
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898 case T_BOOLEAN: case T_BYTE: // 1 byte |
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899 assert(value->type() == T_INT, "Agreement."); |
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900 val = value->get_int(); |
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901 obj->bool_at_put(index, (jboolean)*((jint*)&val)); |
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902 break; |
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903 |
| 0 | 904 default: |
| 905 ShouldNotReachHere(); | |
| 906 } | |
| 907 index++; | |
| 908 } | |
| 909 } | |
| 910 | |
| 911 | |
| 912 // restore fields of an eliminated object array | |
| 913 void Deoptimization::reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj) { | |
| 914 for (int i = 0; i < sv->field_size(); i++) { | |
| 915 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
| 916 assert(value->type() == T_OBJECT, "object element expected"); | |
| 917 obj->obj_at_put(i, value->get_obj()()); | |
| 918 } | |
| 919 } | |
| 920 | |
| 921 | |
| 922 // restore fields of all eliminated objects and arrays | |
| 923 void Deoptimization::reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects) { | |
| 924 for (int i = 0; i < objects->length(); i++) { | |
| 925 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
|
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926 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 927 Handle obj = sv->value(); |
| 928 assert(obj.not_null(), "reallocation was missed"); | |
| 929 | |
| 930 if (k->oop_is_instance()) { | |
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931 InstanceKlass* ik = InstanceKlass::cast(k()); |
| 0 | 932 FieldReassigner reassign(fr, reg_map, sv, obj()); |
| 933 ik->do_nonstatic_fields(&reassign); | |
| 934 } else if (k->oop_is_typeArray()) { | |
|
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935 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
| 0 | 936 reassign_type_array_elements(fr, reg_map, sv, (typeArrayOop) obj(), ak->element_type()); |
| 937 } else if (k->oop_is_objArray()) { | |
| 938 reassign_object_array_elements(fr, reg_map, sv, (objArrayOop) obj()); | |
| 939 } | |
| 940 } | |
| 941 } | |
| 942 | |
| 943 | |
| 944 // relock objects for which synchronization was eliminated | |
|
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945 void Deoptimization::relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread) { |
| 0 | 946 for (int i = 0; i < monitors->length(); i++) { |
|
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947 MonitorInfo* mon_info = monitors->at(i); |
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948 if (mon_info->eliminated()) { |
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949 assert(mon_info->owner() != NULL, "reallocation was missed"); |
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950 Handle obj = Handle(mon_info->owner()); |
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951 markOop mark = obj->mark(); |
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952 if (UseBiasedLocking && mark->has_bias_pattern()) { |
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953 // New allocated objects may have the mark set to anonymously biased. |
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954 // Also the deoptimized method may called methods with synchronization |
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955 // where the thread-local object is bias locked to the current thread. |
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956 assert(mark->is_biased_anonymously() || |
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957 mark->biased_locker() == thread, "should be locked to current thread"); |
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958 // Reset mark word to unbiased prototype. |
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959 markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
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960 obj->set_mark(unbiased_prototype); |
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961 } |
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962 BasicLock* lock = mon_info->lock(); |
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963 ObjectSynchronizer::slow_enter(obj, lock, thread); |
| 0 | 964 } |
|
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965 assert(mon_info->owner()->is_locked(), "object must be locked now"); |
| 0 | 966 } |
| 967 } | |
| 968 | |
| 969 | |
| 970 #ifndef PRODUCT | |
| 971 // print information about reallocated objects | |
| 972 void Deoptimization::print_objects(GrowableArray<ScopeValue*>* objects) { | |
| 973 fieldDescriptor fd; | |
| 974 | |
| 975 for (int i = 0; i < objects->length(); i++) { | |
| 976 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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977 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 978 Handle obj = sv->value(); |
| 979 | |
| 980 tty->print(" object <" INTPTR_FORMAT "> of type ", sv->value()()); | |
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981 k->print_value(); |
| 0 | 982 tty->print(" allocated (%d bytes)", obj->size() * HeapWordSize); |
| 983 tty->cr(); | |
| 984 | |
| 985 if (Verbose) { | |
| 986 k->oop_print_on(obj(), tty); | |
| 987 } | |
| 988 } | |
| 989 } | |
| 990 #endif | |
| 991 #endif // COMPILER2 | |
| 992 | |
| 993 vframeArray* Deoptimization::create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk) { | |
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994 Events::log(thread, "DEOPT PACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT, fr.pc(), fr.sp()); |
| 0 | 995 |
| 996 #ifndef PRODUCT | |
| 997 if (TraceDeoptimization) { | |
| 998 ttyLocker ttyl; | |
| 999 tty->print("DEOPT PACKING thread " INTPTR_FORMAT " ", thread); | |
| 1000 fr.print_on(tty); | |
| 1001 tty->print_cr(" Virtual frames (innermost first):"); | |
| 1002 for (int index = 0; index < chunk->length(); index++) { | |
| 1003 compiledVFrame* vf = chunk->at(index); | |
| 1004 tty->print(" %2d - ", index); | |
| 1005 vf->print_value(); | |
| 1006 int bci = chunk->at(index)->raw_bci(); | |
| 1007 const char* code_name; | |
| 1008 if (bci == SynchronizationEntryBCI) { | |
| 1009 code_name = "sync entry"; | |
| 1010 } else { | |
| 2142 | 1011 Bytecodes::Code code = vf->method()->code_at(bci); |
| 0 | 1012 code_name = Bytecodes::name(code); |
| 1013 } | |
| 1014 tty->print(" - %s", code_name); | |
| 1015 tty->print_cr(" @ bci %d ", bci); | |
| 1016 if (Verbose) { | |
| 1017 vf->print(); | |
| 1018 tty->cr(); | |
| 1019 } | |
| 1020 } | |
| 1021 } | |
| 1022 #endif | |
| 1023 | |
| 1024 // Register map for next frame (used for stack crawl). We capture | |
| 1025 // the state of the deopt'ing frame's caller. Thus if we need to | |
| 1026 // stuff a C2I adapter we can properly fill in the callee-save | |
| 1027 // register locations. | |
| 1028 frame caller = fr.sender(reg_map); | |
| 1029 int frame_size = caller.sp() - fr.sp(); | |
| 1030 | |
| 1031 frame sender = caller; | |
| 1032 | |
| 1033 // Since the Java thread being deoptimized will eventually adjust it's own stack, | |
| 1034 // the vframeArray containing the unpacking information is allocated in the C heap. | |
| 1035 // For Compiler1, the caller of the deoptimized frame is saved for use by unpack_frames(). | |
| 1036 vframeArray* array = vframeArray::allocate(thread, frame_size, chunk, reg_map, sender, caller, fr); | |
| 1037 | |
| 1038 // Compare the vframeArray to the collected vframes | |
| 1039 assert(array->structural_compare(thread, chunk), "just checking"); | |
| 1040 | |
| 1041 #ifndef PRODUCT | |
| 1042 if (TraceDeoptimization) { | |
| 1043 ttyLocker ttyl; | |
| 1044 tty->print_cr(" Created vframeArray " INTPTR_FORMAT, array); | |
| 1045 } | |
| 1046 #endif // PRODUCT | |
| 1047 | |
| 1048 return array; | |
| 1049 } | |
| 1050 | |
| 1051 | |
| 1052 static void collect_monitors(compiledVFrame* cvf, GrowableArray<Handle>* objects_to_revoke) { | |
| 1053 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); | |
| 1054 for (int i = 0; i < monitors->length(); i++) { | |
| 1055 MonitorInfo* mon_info = monitors->at(i); | |
|
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1056 if (!mon_info->eliminated() && mon_info->owner() != NULL) { |
| 0 | 1057 objects_to_revoke->append(Handle(mon_info->owner())); |
| 1058 } | |
| 1059 } | |
| 1060 } | |
| 1061 | |
| 1062 | |
| 1063 void Deoptimization::revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map) { | |
| 1064 if (!UseBiasedLocking) { | |
| 1065 return; | |
| 1066 } | |
| 1067 | |
| 1068 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
| 1069 | |
| 1070 // Unfortunately we don't have a RegisterMap available in most of | |
| 1071 // the places we want to call this routine so we need to walk the | |
| 1072 // stack again to update the register map. | |
| 1073 if (map == NULL || !map->update_map()) { | |
| 1074 StackFrameStream sfs(thread, true); | |
| 1075 bool found = false; | |
| 1076 while (!found && !sfs.is_done()) { | |
| 1077 frame* cur = sfs.current(); | |
| 1078 sfs.next(); | |
| 1079 found = cur->id() == fr.id(); | |
| 1080 } | |
| 1081 assert(found, "frame to be deoptimized not found on target thread's stack"); | |
| 1082 map = sfs.register_map(); | |
| 1083 } | |
| 1084 | |
| 1085 vframe* vf = vframe::new_vframe(&fr, map, thread); | |
| 1086 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1087 // Revoke monitors' biases in all scopes | |
| 1088 while (!cvf->is_top()) { | |
| 1089 collect_monitors(cvf, objects_to_revoke); | |
| 1090 cvf = compiledVFrame::cast(cvf->sender()); | |
| 1091 } | |
| 1092 collect_monitors(cvf, objects_to_revoke); | |
| 1093 | |
| 1094 if (SafepointSynchronize::is_at_safepoint()) { | |
| 1095 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
| 1096 } else { | |
| 1097 BiasedLocking::revoke(objects_to_revoke); | |
| 1098 } | |
| 1099 } | |
| 1100 | |
| 1101 | |
| 1102 void Deoptimization::revoke_biases_of_monitors(CodeBlob* cb) { | |
| 1103 if (!UseBiasedLocking) { | |
| 1104 return; | |
| 1105 } | |
| 1106 | |
| 1107 assert(SafepointSynchronize::is_at_safepoint(), "must only be called from safepoint"); | |
| 1108 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
| 1109 for (JavaThread* jt = Threads::first(); jt != NULL ; jt = jt->next()) { | |
| 1110 if (jt->has_last_Java_frame()) { | |
| 1111 StackFrameStream sfs(jt, true); | |
| 1112 while (!sfs.is_done()) { | |
| 1113 frame* cur = sfs.current(); | |
| 1114 if (cb->contains(cur->pc())) { | |
| 1115 vframe* vf = vframe::new_vframe(cur, sfs.register_map(), jt); | |
| 1116 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1117 // Revoke monitors' biases in all scopes | |
| 1118 while (!cvf->is_top()) { | |
| 1119 collect_monitors(cvf, objects_to_revoke); | |
| 1120 cvf = compiledVFrame::cast(cvf->sender()); | |
| 1121 } | |
| 1122 collect_monitors(cvf, objects_to_revoke); | |
| 1123 } | |
| 1124 sfs.next(); | |
| 1125 } | |
| 1126 } | |
| 1127 } | |
| 1128 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
| 1129 } | |
| 1130 | |
| 1131 | |
| 1132 void Deoptimization::deoptimize_single_frame(JavaThread* thread, frame fr) { | |
| 1133 assert(fr.can_be_deoptimized(), "checking frame type"); | |
| 1134 | |
| 1135 gather_statistics(Reason_constraint, Action_none, Bytecodes::_illegal); | |
| 1136 | |
| 1137 // Patch the nmethod so that when execution returns to it we will | |
| 1138 // deopt the execution state and return to the interpreter. | |
| 1139 fr.deoptimize(thread); | |
| 1140 } | |
| 1141 | |
| 1142 void Deoptimization::deoptimize(JavaThread* thread, frame fr, RegisterMap *map) { | |
| 1143 // Deoptimize only if the frame comes from compile code. | |
| 1144 // Do not deoptimize the frame which is already patched | |
| 1145 // during the execution of the loops below. | |
| 1146 if (!fr.is_compiled_frame() || fr.is_deoptimized_frame()) { | |
| 1147 return; | |
| 1148 } | |
| 1149 ResourceMark rm; | |
| 1150 DeoptimizationMarker dm; | |
| 1151 if (UseBiasedLocking) { | |
| 1152 revoke_biases_of_monitors(thread, fr, map); | |
| 1153 } | |
| 1154 deoptimize_single_frame(thread, fr); | |
| 1155 | |
| 1156 } | |
| 1157 | |
| 1158 | |
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1159 void Deoptimization::deoptimize_frame_internal(JavaThread* thread, intptr_t* id) { |
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1160 assert(thread == Thread::current() || SafepointSynchronize::is_at_safepoint(), |
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1161 "can only deoptimize other thread at a safepoint"); |
| 0 | 1162 // Compute frame and register map based on thread and sp. |
| 1163 RegisterMap reg_map(thread, UseBiasedLocking); | |
| 1164 frame fr = thread->last_frame(); | |
| 1165 while (fr.id() != id) { | |
| 1166 fr = fr.sender(®_map); | |
| 1167 } | |
| 1168 deoptimize(thread, fr, ®_map); | |
| 1169 } | |
| 1170 | |
| 1171 | |
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1172 void Deoptimization::deoptimize_frame(JavaThread* thread, intptr_t* id) { |
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1173 if (thread == Thread::current()) { |
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1174 Deoptimization::deoptimize_frame_internal(thread, id); |
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1175 } else { |
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1176 VM_DeoptimizeFrame deopt(thread, id); |
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1177 VMThread::execute(&deopt); |
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1178 } |
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1179 } |
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1180 |
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1181 |
| 0 | 1182 // JVMTI PopFrame support |
| 1183 JRT_LEAF(void, Deoptimization::popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address)) | |
| 1184 { | |
| 1185 thread->popframe_preserve_args(in_ByteSize(bytes_to_save), start_address); | |
| 1186 } | |
| 1187 JRT_END | |
| 1188 | |
| 1189 | |
| 1692 | 1190 #if defined(COMPILER2) || defined(SHARK) |
| 0 | 1191 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS) { |
| 1192 // in case of an unresolved klass entry, load the class. | |
| 1193 if (constant_pool->tag_at(index).is_unresolved_klass()) { | |
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1194 Klass* tk = constant_pool->klass_at(index, CHECK); |
| 0 | 1195 return; |
| 1196 } | |
| 1197 | |
| 1198 if (!constant_pool->tag_at(index).is_symbol()) return; | |
| 1199 | |
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1200 Handle class_loader (THREAD, constant_pool->pool_holder()->class_loader()); |
|
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1201 Symbol* symbol = constant_pool->symbol_at(index); |
| 0 | 1202 |
| 1203 // class name? | |
| 1204 if (symbol->byte_at(0) != '(') { | |
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1205 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
| 0 | 1206 SystemDictionary::resolve_or_null(symbol, class_loader, protection_domain, CHECK); |
| 1207 return; | |
| 1208 } | |
| 1209 | |
| 1210 // then it must be a signature! | |
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1211 ResourceMark rm(THREAD); |
| 0 | 1212 for (SignatureStream ss(symbol); !ss.is_done(); ss.next()) { |
| 1213 if (ss.is_object()) { | |
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1214 Symbol* class_name = ss.as_symbol(CHECK); |
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1215 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
| 0 | 1216 SystemDictionary::resolve_or_null(class_name, class_loader, protection_domain, CHECK); |
| 1217 } | |
| 1218 } | |
| 1219 } | |
| 1220 | |
| 1221 | |
| 1222 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) { | |
| 1223 EXCEPTION_MARK; | |
| 1224 load_class_by_index(constant_pool, index, THREAD); | |
| 1225 if (HAS_PENDING_EXCEPTION) { | |
| 1226 // Exception happened during classloading. We ignore the exception here, since it | |
| 1227 // is going to be rethrown since the current activation is going to be deoptimzied and | |
| 1228 // the interpreter will re-execute the bytecode. | |
| 1229 CLEAR_PENDING_EXCEPTION; | |
| 1230 } | |
| 1231 } | |
| 1232 | |
| 1233 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) { | |
| 1234 HandleMark hm; | |
| 1235 | |
| 1236 // uncommon_trap() is called at the beginning of the uncommon trap | |
| 1237 // handler. Note this fact before we start generating temporary frames | |
| 1238 // that can confuse an asynchronous stack walker. This counter is | |
| 1239 // decremented at the end of unpack_frames(). | |
| 1240 thread->inc_in_deopt_handler(); | |
| 1241 | |
| 1242 // We need to update the map if we have biased locking. | |
| 1243 RegisterMap reg_map(thread, UseBiasedLocking); | |
| 1244 frame stub_frame = thread->last_frame(); | |
| 1245 frame fr = stub_frame.sender(®_map); | |
| 1246 // Make sure the calling nmethod is not getting deoptimized and removed | |
| 1247 // before we are done with it. | |
| 1248 nmethodLocker nl(fr.pc()); | |
| 1249 | |
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1250 // Log a message |
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1251 Events::log(thread, "Uncommon trap: trap_request=" PTR32_FORMAT " fr.pc=" INTPTR_FORMAT, |
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1252 trap_request, fr.pc()); |
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1253 |
| 0 | 1254 { |
| 1255 ResourceMark rm; | |
| 1256 | |
| 1257 // Revoke biases of any monitors in the frame to ensure we can migrate them | |
| 1258 revoke_biases_of_monitors(thread, fr, ®_map); | |
| 1259 | |
| 1260 DeoptReason reason = trap_request_reason(trap_request); | |
| 1261 DeoptAction action = trap_request_action(trap_request); | |
| 1262 jint unloaded_class_index = trap_request_index(trap_request); // CP idx or -1 | |
| 1263 | |
| 1264 vframe* vf = vframe::new_vframe(&fr, ®_map, thread); | |
| 1265 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1266 | |
| 1267 nmethod* nm = cvf->code(); | |
| 1268 | |
| 1269 ScopeDesc* trap_scope = cvf->scope(); | |
| 1270 methodHandle trap_method = trap_scope->method(); | |
| 1271 int trap_bci = trap_scope->bci(); | |
| 2142 | 1272 Bytecodes::Code trap_bc = trap_method->java_code_at(trap_bci); |
| 0 | 1273 |
| 1274 // Record this event in the histogram. | |
| 1275 gather_statistics(reason, action, trap_bc); | |
| 1276 | |
| 1277 // Ensure that we can record deopt. history: | |
| 1278 bool create_if_missing = ProfileTraps; | |
| 1279 | |
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1280 MethodData* trap_mdo = |
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1281 get_method_data(thread, trap_method, create_if_missing); |
| 0 | 1282 |
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1283 // Log a message |
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1284 Events::log_deopt_message(thread, "Uncommon trap: reason=%s action=%s pc=" INTPTR_FORMAT " method=%s @ %d", |
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1285 trap_reason_name(reason), trap_action_name(action), fr.pc(), |
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1286 trap_method->name_and_sig_as_C_string(), trap_bci); |
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1287 |
| 0 | 1288 // Print a bunch of diagnostics, if requested. |
| 1289 if (TraceDeoptimization || LogCompilation) { | |
| 1290 ResourceMark rm; | |
| 1291 ttyLocker ttyl; | |
| 1292 char buf[100]; | |
| 1293 if (xtty != NULL) { | |
| 1294 xtty->begin_head("uncommon_trap thread='" UINTX_FORMAT"' %s", | |
| 1295 os::current_thread_id(), | |
| 1296 format_trap_request(buf, sizeof(buf), trap_request)); | |
| 1297 nm->log_identity(xtty); | |
| 1298 } | |
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1299 Symbol* class_name = NULL; |
| 0 | 1300 bool unresolved = false; |
| 1301 if (unloaded_class_index >= 0) { | |
| 1302 constantPoolHandle constants (THREAD, trap_method->constants()); | |
| 1303 if (constants->tag_at(unloaded_class_index).is_unresolved_klass()) { | |
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1304 class_name = constants->klass_name_at(unloaded_class_index); |
| 0 | 1305 unresolved = true; |
| 1306 if (xtty != NULL) | |
| 1307 xtty->print(" unresolved='1'"); | |
| 1308 } else if (constants->tag_at(unloaded_class_index).is_symbol()) { | |
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1309 class_name = constants->symbol_at(unloaded_class_index); |
| 0 | 1310 } |
| 1311 if (xtty != NULL) | |
| 1312 xtty->name(class_name); | |
| 1313 } | |
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1314 if (xtty != NULL && trap_mdo != NULL) { |
| 0 | 1315 // Dump the relevant MDO state. |
| 1316 // This is the deopt count for the current reason, any previous | |
| 1317 // reasons or recompiles seen at this point. | |
| 1318 int dcnt = trap_mdo->trap_count(reason); | |
| 1319 if (dcnt != 0) | |
| 1320 xtty->print(" count='%d'", dcnt); | |
| 1321 ProfileData* pdata = trap_mdo->bci_to_data(trap_bci); | |
| 1322 int dos = (pdata == NULL)? 0: pdata->trap_state(); | |
| 1323 if (dos != 0) { | |
| 1324 xtty->print(" state='%s'", format_trap_state(buf, sizeof(buf), dos)); | |
| 1325 if (trap_state_is_recompiled(dos)) { | |
| 1326 int recnt2 = trap_mdo->overflow_recompile_count(); | |
| 1327 if (recnt2 != 0) | |
| 1328 xtty->print(" recompiles2='%d'", recnt2); | |
| 1329 } | |
| 1330 } | |
| 1331 } | |
| 1332 if (xtty != NULL) { | |
| 1333 xtty->stamp(); | |
| 1334 xtty->end_head(); | |
| 1335 } | |
| 1336 if (TraceDeoptimization) { // make noise on the tty | |
| 1337 tty->print("Uncommon trap occurred in"); | |
| 1338 nm->method()->print_short_name(tty); | |
| 6843 | 1339 tty->print(" (@" INTPTR_FORMAT ") thread=" UINTX_FORMAT " reason=%s action=%s unloaded_class_index=%d", |
| 0 | 1340 fr.pc(), |
| 6843 | 1341 os::current_thread_id(), |
| 0 | 1342 trap_reason_name(reason), |
| 1343 trap_action_name(action), | |
| 1344 unloaded_class_index); | |
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1345 if (class_name != NULL) { |
| 0 | 1346 tty->print(unresolved ? " unresolved class: " : " symbol: "); |
| 1347 class_name->print_symbol_on(tty); | |
| 1348 } | |
| 1349 tty->cr(); | |
| 1350 } | |
| 1351 if (xtty != NULL) { | |
| 1352 // Log the precise location of the trap. | |
| 1353 for (ScopeDesc* sd = trap_scope; ; sd = sd->sender()) { | |
| 1354 xtty->begin_elem("jvms bci='%d'", sd->bci()); | |
| 1355 xtty->method(sd->method()); | |
| 1356 xtty->end_elem(); | |
| 1357 if (sd->is_top()) break; | |
| 1358 } | |
| 1359 xtty->tail("uncommon_trap"); | |
| 1360 } | |
| 1361 } | |
| 1362 // (End diagnostic printout.) | |
| 1363 | |
| 1364 // Load class if necessary | |
| 1365 if (unloaded_class_index >= 0) { | |
| 1366 constantPoolHandle constants(THREAD, trap_method->constants()); | |
| 1367 load_class_by_index(constants, unloaded_class_index); | |
| 1368 } | |
| 1369 | |
| 1370 // Flush the nmethod if necessary and desirable. | |
| 1371 // | |
| 1372 // We need to avoid situations where we are re-flushing the nmethod | |
| 1373 // because of a hot deoptimization site. Repeated flushes at the same | |
| 1374 // point need to be detected by the compiler and avoided. If the compiler | |
| 1375 // cannot avoid them (or has a bug and "refuses" to avoid them), this | |
| 1376 // module must take measures to avoid an infinite cycle of recompilation | |
| 1377 // and deoptimization. There are several such measures: | |
| 1378 // | |
| 1379 // 1. If a recompilation is ordered a second time at some site X | |
| 1380 // and for the same reason R, the action is adjusted to 'reinterpret', | |
| 1381 // to give the interpreter time to exercise the method more thoroughly. | |
| 1382 // If this happens, the method's overflow_recompile_count is incremented. | |
| 1383 // | |
| 1384 // 2. If the compiler fails to reduce the deoptimization rate, then | |
| 1385 // the method's overflow_recompile_count will begin to exceed the set | |
| 1386 // limit PerBytecodeRecompilationCutoff. If this happens, the action | |
| 1387 // is adjusted to 'make_not_compilable', and the method is abandoned | |
| 1388 // to the interpreter. This is a performance hit for hot methods, | |
| 1389 // but is better than a disastrous infinite cycle of recompilations. | |
| 1390 // (Actually, only the method containing the site X is abandoned.) | |
| 1391 // | |
| 1392 // 3. In parallel with the previous measures, if the total number of | |
| 1393 // recompilations of a method exceeds the much larger set limit | |
| 1394 // PerMethodRecompilationCutoff, the method is abandoned. | |
| 1395 // This should only happen if the method is very large and has | |
| 1396 // many "lukewarm" deoptimizations. The code which enforces this | |
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1397 // limit is elsewhere (class nmethod, class Method). |
| 0 | 1398 // |
| 1399 // Note that the per-BCI 'is_recompiled' bit gives the compiler one chance | |
| 1400 // to recompile at each bytecode independently of the per-BCI cutoff. | |
| 1401 // | |
| 1402 // The decision to update code is up to the compiler, and is encoded | |
| 1403 // in the Action_xxx code. If the compiler requests Action_none | |
| 1404 // no trap state is changed, no compiled code is changed, and the | |
| 1405 // computation suffers along in the interpreter. | |
| 1406 // | |
| 1407 // The other action codes specify various tactics for decompilation | |
| 1408 // and recompilation. Action_maybe_recompile is the loosest, and | |
| 1409 // allows the compiled code to stay around until enough traps are seen, | |
| 1410 // and until the compiler gets around to recompiling the trapping method. | |
| 1411 // | |
| 1412 // The other actions cause immediate removal of the present code. | |
| 1413 | |
| 1414 bool update_trap_state = true; | |
| 1415 bool make_not_entrant = false; | |
| 1416 bool make_not_compilable = false; | |
| 1783 | 1417 bool reprofile = false; |
| 0 | 1418 switch (action) { |
| 1419 case Action_none: | |
| 1420 // Keep the old code. | |
| 1421 update_trap_state = false; | |
| 1422 break; | |
| 1423 case Action_maybe_recompile: | |
| 1424 // Do not need to invalidate the present code, but we can | |
| 1425 // initiate another | |
| 1426 // Start compiler without (necessarily) invalidating the nmethod. | |
| 1427 // The system will tolerate the old code, but new code should be | |
| 1428 // generated when possible. | |
| 1429 break; | |
| 1430 case Action_reinterpret: | |
| 1431 // Go back into the interpreter for a while, and then consider | |
| 1432 // recompiling form scratch. | |
| 1433 make_not_entrant = true; | |
| 1434 // Reset invocation counter for outer most method. | |
| 1435 // This will allow the interpreter to exercise the bytecodes | |
| 1436 // for a while before recompiling. | |
| 1437 // By contrast, Action_make_not_entrant is immediate. | |
| 1438 // | |
| 1439 // Note that the compiler will track null_check, null_assert, | |
| 1440 // range_check, and class_check events and log them as if they | |
| 1441 // had been traps taken from compiled code. This will update | |
| 1442 // the MDO trap history so that the next compilation will | |
| 1443 // properly detect hot trap sites. | |
| 1783 | 1444 reprofile = true; |
| 0 | 1445 break; |
| 1446 case Action_make_not_entrant: | |
| 1447 // Request immediate recompilation, and get rid of the old code. | |
| 1448 // Make them not entrant, so next time they are called they get | |
| 1449 // recompiled. Unloaded classes are loaded now so recompile before next | |
| 1450 // time they are called. Same for uninitialized. The interpreter will | |
| 1451 // link the missing class, if any. | |
| 1452 make_not_entrant = true; | |
| 1453 break; | |
| 1454 case Action_make_not_compilable: | |
| 1455 // Give up on compiling this method at all. | |
| 1456 make_not_entrant = true; | |
| 1457 make_not_compilable = true; | |
| 1458 break; | |
| 1459 default: | |
| 1460 ShouldNotReachHere(); | |
| 1461 } | |
| 1462 | |
| 1463 // Setting +ProfileTraps fixes the following, on all platforms: | |
| 1464 // 4852688: ProfileInterpreter is off by default for ia64. The result is | |
| 1465 // infinite heroic-opt-uncommon-trap/deopt/recompile cycles, since the | |
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1466 // recompile relies on a MethodData* to record heroic opt failures. |
| 0 | 1467 |
| 1468 // Whether the interpreter is producing MDO data or not, we also need | |
| 1469 // to use the MDO to detect hot deoptimization points and control | |
| 1470 // aggressive optimization. | |
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1471 bool inc_recompile_count = false; |
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1472 ProfileData* pdata = NULL; |
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1473 if (ProfileTraps && update_trap_state && trap_mdo != NULL) { |
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1474 assert(trap_mdo == get_method_data(thread, trap_method, false), "sanity"); |
| 0 | 1475 uint this_trap_count = 0; |
| 1476 bool maybe_prior_trap = false; | |
| 1477 bool maybe_prior_recompile = false; | |
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1478 pdata = query_update_method_data(trap_mdo, trap_bci, reason, |
| 0 | 1479 //outputs: |
| 1480 this_trap_count, | |
| 1481 maybe_prior_trap, | |
| 1482 maybe_prior_recompile); | |
| 1483 // Because the interpreter also counts null, div0, range, and class | |
| 1484 // checks, these traps from compiled code are double-counted. | |
| 1485 // This is harmless; it just means that the PerXTrapLimit values | |
| 1486 // are in effect a little smaller than they look. | |
| 1487 | |
| 1488 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
| 1489 if (per_bc_reason != Reason_none) { | |
| 1490 // Now take action based on the partially known per-BCI history. | |
| 1491 if (maybe_prior_trap | |
| 1492 && this_trap_count >= (uint)PerBytecodeTrapLimit) { | |
| 1493 // If there are too many traps at this BCI, force a recompile. | |
| 1494 // This will allow the compiler to see the limit overflow, and | |
| 1495 // take corrective action, if possible. The compiler generally | |
| 1496 // does not use the exact PerBytecodeTrapLimit value, but instead | |
| 1497 // changes its tactics if it sees any traps at all. This provides | |
| 1498 // a little hysteresis, delaying a recompile until a trap happens | |
| 1499 // several times. | |
| 1500 // | |
| 1501 // Actually, since there is only one bit of counter per BCI, | |
| 1502 // the possible per-BCI counts are {0,1,(per-method count)}. | |
| 1503 // This produces accurate results if in fact there is only | |
| 1504 // one hot trap site, but begins to get fuzzy if there are | |
| 1505 // many sites. For example, if there are ten sites each | |
| 1506 // trapping two or more times, they each get the blame for | |
| 1507 // all of their traps. | |
| 1508 make_not_entrant = true; | |
| 1509 } | |
| 1510 | |
| 1511 // Detect repeated recompilation at the same BCI, and enforce a limit. | |
| 1512 if (make_not_entrant && maybe_prior_recompile) { | |
| 1513 // More than one recompile at this point. | |
|
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1514 inc_recompile_count = maybe_prior_trap; |
| 0 | 1515 } |
| 1516 } else { | |
| 1517 // For reasons which are not recorded per-bytecode, we simply | |
| 1518 // force recompiles unconditionally. | |
| 1519 // (Note that PerMethodRecompilationCutoff is enforced elsewhere.) | |
| 1520 make_not_entrant = true; | |
| 1521 } | |
| 1522 | |
| 1523 // Go back to the compiler if there are too many traps in this method. | |
| 1524 if (this_trap_count >= (uint)PerMethodTrapLimit) { | |
| 1525 // If there are too many traps in this method, force a recompile. | |
| 1526 // This will allow the compiler to see the limit overflow, and | |
| 1527 // take corrective action, if possible. | |
| 1528 // (This condition is an unlikely backstop only, because the | |
| 1529 // PerBytecodeTrapLimit is more likely to take effect first, | |
| 1530 // if it is applicable.) | |
| 1531 make_not_entrant = true; | |
| 1532 } | |
| 1533 | |
| 1534 // Here's more hysteresis: If there has been a recompile at | |
| 1535 // this trap point already, run the method in the interpreter | |
| 1536 // for a while to exercise it more thoroughly. | |
| 1537 if (make_not_entrant && maybe_prior_recompile && maybe_prior_trap) { | |
| 1783 | 1538 reprofile = true; |
| 0 | 1539 } |
| 1540 | |
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1541 } |
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1542 |
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1543 // Take requested actions on the method: |
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1544 |
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1545 // Recompile |
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1546 if (make_not_entrant) { |
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1547 if (!nm->make_not_entrant()) { |
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1548 return; // the call did not change nmethod's state |
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1549 } |
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1550 |
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1551 if (pdata != NULL) { |
| 0 | 1552 // Record the recompilation event, if any. |
| 1553 int tstate0 = pdata->trap_state(); | |
| 1554 int tstate1 = trap_state_set_recompiled(tstate0, true); | |
| 1555 if (tstate1 != tstate0) | |
| 1556 pdata->set_trap_state(tstate1); | |
| 1557 } | |
| 1558 } | |
| 1559 | |
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1560 if (inc_recompile_count) { |
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1561 trap_mdo->inc_overflow_recompile_count(); |
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1562 if ((uint)trap_mdo->overflow_recompile_count() > |
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1563 (uint)PerBytecodeRecompilationCutoff) { |
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1564 // Give up on the method containing the bad BCI. |
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1565 if (trap_method() == nm->method()) { |
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1566 make_not_compilable = true; |
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1567 } else { |
| 7998 | 1568 trap_method->set_not_compilable(CompLevel_full_optimization, true, "overflow_recompile_count > PerBytecodeRecompilationCutoff"); |
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1569 // But give grace to the enclosing nm->method(). |
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1570 } |
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1571 } |
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1572 } |
| 0 | 1573 |
| 1783 | 1574 // Reprofile |
| 1575 if (reprofile) { | |
| 1576 CompilationPolicy::policy()->reprofile(trap_scope, nm->is_osr_method()); | |
| 0 | 1577 } |
| 1578 | |
| 1579 // Give up compiling | |
| 1783 | 1580 if (make_not_compilable && !nm->method()->is_not_compilable(CompLevel_full_optimization)) { |
| 0 | 1581 assert(make_not_entrant, "consistent"); |
| 1783 | 1582 nm->method()->set_not_compilable(CompLevel_full_optimization); |
| 0 | 1583 } |
| 1584 | |
| 1585 } // Free marked resources | |
| 1586 | |
| 1587 } | |
| 1588 JRT_END | |
| 1589 | |
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1590 MethodData* |
| 0 | 1591 Deoptimization::get_method_data(JavaThread* thread, methodHandle m, |
| 1592 bool create_if_missing) { | |
| 1593 Thread* THREAD = thread; | |
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1594 MethodData* mdo = m()->method_data(); |
| 0 | 1595 if (mdo == NULL && create_if_missing && !HAS_PENDING_EXCEPTION) { |
| 1596 // Build an MDO. Ignore errors like OutOfMemory; | |
| 1597 // that simply means we won't have an MDO to update. | |
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1598 Method::build_interpreter_method_data(m, THREAD); |
| 0 | 1599 if (HAS_PENDING_EXCEPTION) { |
| 1600 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); | |
| 1601 CLEAR_PENDING_EXCEPTION; | |
| 1602 } | |
| 1603 mdo = m()->method_data(); | |
| 1604 } | |
| 1605 return mdo; | |
| 1606 } | |
| 1607 | |
| 1608 ProfileData* | |
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1609 Deoptimization::query_update_method_data(MethodData* trap_mdo, |
| 0 | 1610 int trap_bci, |
| 1611 Deoptimization::DeoptReason reason, | |
| 1612 //outputs: | |
| 1613 uint& ret_this_trap_count, | |
| 1614 bool& ret_maybe_prior_trap, | |
| 1615 bool& ret_maybe_prior_recompile) { | |
| 1616 uint prior_trap_count = trap_mdo->trap_count(reason); | |
| 1617 uint this_trap_count = trap_mdo->inc_trap_count(reason); | |
| 1618 | |
| 1619 // If the runtime cannot find a place to store trap history, | |
| 1620 // it is estimated based on the general condition of the method. | |
| 1621 // If the method has ever been recompiled, or has ever incurred | |
| 1622 // a trap with the present reason , then this BCI is assumed | |
| 1623 // (pessimistically) to be the culprit. | |
| 1624 bool maybe_prior_trap = (prior_trap_count != 0); | |
| 1625 bool maybe_prior_recompile = (trap_mdo->decompile_count() != 0); | |
| 1626 ProfileData* pdata = NULL; | |
| 1627 | |
| 1628 | |
| 1629 // For reasons which are recorded per bytecode, we check per-BCI data. | |
| 1630 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
| 1631 if (per_bc_reason != Reason_none) { | |
| 1632 // Find the profile data for this BCI. If there isn't one, | |
| 1633 // try to allocate one from the MDO's set of spares. | |
| 1634 // This will let us detect a repeated trap at this point. | |
| 1635 pdata = trap_mdo->allocate_bci_to_data(trap_bci); | |
| 1636 | |
| 1637 if (pdata != NULL) { | |
| 1638 // Query the trap state of this profile datum. | |
| 1639 int tstate0 = pdata->trap_state(); | |
| 1640 if (!trap_state_has_reason(tstate0, per_bc_reason)) | |
| 1641 maybe_prior_trap = false; | |
| 1642 if (!trap_state_is_recompiled(tstate0)) | |
| 1643 maybe_prior_recompile = false; | |
| 1644 | |
| 1645 // Update the trap state of this profile datum. | |
| 1646 int tstate1 = tstate0; | |
| 1647 // Record the reason. | |
| 1648 tstate1 = trap_state_add_reason(tstate1, per_bc_reason); | |
| 1649 // Store the updated state on the MDO, for next time. | |
| 1650 if (tstate1 != tstate0) | |
| 1651 pdata->set_trap_state(tstate1); | |
| 1652 } else { | |
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1653 if (LogCompilation && xtty != NULL) { |
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1654 ttyLocker ttyl; |
| 0 | 1655 // Missing MDP? Leave a small complaint in the log. |
| 1656 xtty->elem("missing_mdp bci='%d'", trap_bci); | |
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1657 } |
| 0 | 1658 } |
| 1659 } | |
| 1660 | |
| 1661 // Return results: | |
| 1662 ret_this_trap_count = this_trap_count; | |
| 1663 ret_maybe_prior_trap = maybe_prior_trap; | |
| 1664 ret_maybe_prior_recompile = maybe_prior_recompile; | |
| 1665 return pdata; | |
| 1666 } | |
| 1667 | |
| 1668 void | |
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1669 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
| 0 | 1670 ResourceMark rm; |
| 1671 // Ignored outputs: | |
| 1672 uint ignore_this_trap_count; | |
| 1673 bool ignore_maybe_prior_trap; | |
| 1674 bool ignore_maybe_prior_recompile; | |
| 1675 query_update_method_data(trap_mdo, trap_bci, | |
| 1676 (DeoptReason)reason, | |
| 1677 ignore_this_trap_count, | |
| 1678 ignore_maybe_prior_trap, | |
| 1679 ignore_maybe_prior_recompile); | |
| 1680 } | |
| 1681 | |
| 1682 Deoptimization::UnrollBlock* Deoptimization::uncommon_trap(JavaThread* thread, jint trap_request) { | |
| 1683 | |
| 1684 // Still in Java no safepoints | |
| 1685 { | |
| 1686 // This enters VM and may safepoint | |
| 1687 uncommon_trap_inner(thread, trap_request); | |
| 1688 } | |
| 1689 return fetch_unroll_info_helper(thread); | |
| 1690 } | |
| 1691 | |
| 1692 // Local derived constants. | |
| 1693 // Further breakdown of DataLayout::trap_state, as promised by DataLayout. | |
| 1694 const int DS_REASON_MASK = DataLayout::trap_mask >> 1; | |
| 1695 const int DS_RECOMPILE_BIT = DataLayout::trap_mask - DS_REASON_MASK; | |
| 1696 | |
| 1697 //---------------------------trap_state_reason--------------------------------- | |
| 1698 Deoptimization::DeoptReason | |
| 1699 Deoptimization::trap_state_reason(int trap_state) { | |
| 1700 // This assert provides the link between the width of DataLayout::trap_bits | |
| 1701 // and the encoding of "recorded" reasons. It ensures there are enough | |
| 1702 // bits to store all needed reasons in the per-BCI MDO profile. | |
| 1703 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
| 1704 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
| 1705 trap_state -= recompile_bit; | |
| 1706 if (trap_state == DS_REASON_MASK) { | |
| 1707 return Reason_many; | |
| 1708 } else { | |
| 1709 assert((int)Reason_none == 0, "state=0 => Reason_none"); | |
| 1710 return (DeoptReason)trap_state; | |
| 1711 } | |
| 1712 } | |
| 1713 //-------------------------trap_state_has_reason------------------------------- | |
| 1714 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
| 1715 assert(reason_is_recorded_per_bytecode((DeoptReason)reason), "valid reason"); | |
| 1716 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
| 1717 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
| 1718 trap_state -= recompile_bit; | |
| 1719 if (trap_state == DS_REASON_MASK) { | |
| 1720 return -1; // true, unspecifically (bottom of state lattice) | |
| 1721 } else if (trap_state == reason) { | |
| 1722 return 1; // true, definitely | |
| 1723 } else if (trap_state == 0) { | |
| 1724 return 0; // false, definitely (top of state lattice) | |
| 1725 } else { | |
| 1726 return 0; // false, definitely | |
| 1727 } | |
| 1728 } | |
| 1729 //-------------------------trap_state_add_reason------------------------------- | |
| 1730 int Deoptimization::trap_state_add_reason(int trap_state, int reason) { | |
| 1731 assert(reason_is_recorded_per_bytecode((DeoptReason)reason) || reason == Reason_many, "valid reason"); | |
| 1732 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
| 1733 trap_state -= recompile_bit; | |
| 1734 if (trap_state == DS_REASON_MASK) { | |
| 1735 return trap_state + recompile_bit; // already at state lattice bottom | |
| 1736 } else if (trap_state == reason) { | |
| 1737 return trap_state + recompile_bit; // the condition is already true | |
| 1738 } else if (trap_state == 0) { | |
| 1739 return reason + recompile_bit; // no condition has yet been true | |
| 1740 } else { | |
| 1741 return DS_REASON_MASK + recompile_bit; // fall to state lattice bottom | |
| 1742 } | |
| 1743 } | |
| 1744 //-----------------------trap_state_is_recompiled------------------------------ | |
| 1745 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
| 1746 return (trap_state & DS_RECOMPILE_BIT) != 0; | |
| 1747 } | |
| 1748 //-----------------------trap_state_set_recompiled----------------------------- | |
| 1749 int Deoptimization::trap_state_set_recompiled(int trap_state, bool z) { | |
| 1750 if (z) return trap_state | DS_RECOMPILE_BIT; | |
| 1751 else return trap_state & ~DS_RECOMPILE_BIT; | |
| 1752 } | |
| 1753 //---------------------------format_trap_state--------------------------------- | |
| 1754 // This is used for debugging and diagnostics, including hotspot.log output. | |
| 1755 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
| 1756 int trap_state) { | |
| 1757 DeoptReason reason = trap_state_reason(trap_state); | |
| 1758 bool recomp_flag = trap_state_is_recompiled(trap_state); | |
| 1759 // Re-encode the state from its decoded components. | |
| 1760 int decoded_state = 0; | |
| 1761 if (reason_is_recorded_per_bytecode(reason) || reason == Reason_many) | |
| 1762 decoded_state = trap_state_add_reason(decoded_state, reason); | |
| 1763 if (recomp_flag) | |
| 1764 decoded_state = trap_state_set_recompiled(decoded_state, recomp_flag); | |
| 1765 // If the state re-encodes properly, format it symbolically. | |
| 1766 // Because this routine is used for debugging and diagnostics, | |
| 1767 // be robust even if the state is a strange value. | |
| 1768 size_t len; | |
| 1769 if (decoded_state != trap_state) { | |
| 1770 // Random buggy state that doesn't decode?? | |
| 1771 len = jio_snprintf(buf, buflen, "#%d", trap_state); | |
| 1772 } else { | |
| 1773 len = jio_snprintf(buf, buflen, "%s%s", | |
| 1774 trap_reason_name(reason), | |
| 1775 recomp_flag ? " recompiled" : ""); | |
| 1776 } | |
| 1777 if (len >= buflen) | |
| 1778 buf[buflen-1] = '\0'; | |
| 1779 return buf; | |
| 1780 } | |
| 1781 | |
| 1782 | |
| 1783 //--------------------------------statics-------------------------------------- | |
| 1784 Deoptimization::DeoptAction Deoptimization::_unloaded_action | |
| 1785 = Deoptimization::Action_reinterpret; | |
| 1786 const char* Deoptimization::_trap_reason_name[Reason_LIMIT] = { | |
| 1787 // Note: Keep this in sync. with enum DeoptReason. | |
| 1788 "none", | |
| 1789 "null_check", | |
| 1790 "null_assert", | |
| 1791 "range_check", | |
| 1792 "class_check", | |
| 1793 "array_check", | |
| 1794 "intrinsic", | |
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1795 "bimorphic", |
| 0 | 1796 "unloaded", |
| 1797 "uninitialized", | |
| 1798 "unreached", | |
| 1799 "unhandled", | |
| 1800 "constraint", | |
| 1801 "div0_check", | |
| 1172 | 1802 "age", |
| 3345 | 1803 "predicate", |
| 1804 "loop_limit_check" | |
| 0 | 1805 }; |
| 1806 const char* Deoptimization::_trap_action_name[Action_LIMIT] = { | |
| 1807 // Note: Keep this in sync. with enum DeoptAction. | |
| 1808 "none", | |
| 1809 "maybe_recompile", | |
| 1810 "reinterpret", | |
| 1811 "make_not_entrant", | |
| 1812 "make_not_compilable" | |
| 1813 }; | |
| 1814 | |
| 1815 const char* Deoptimization::trap_reason_name(int reason) { | |
| 1816 if (reason == Reason_many) return "many"; | |
| 1817 if ((uint)reason < Reason_LIMIT) | |
| 1818 return _trap_reason_name[reason]; | |
| 1819 static char buf[20]; | |
| 1820 sprintf(buf, "reason%d", reason); | |
| 1821 return buf; | |
| 1822 } | |
| 1823 const char* Deoptimization::trap_action_name(int action) { | |
| 1824 if ((uint)action < Action_LIMIT) | |
| 1825 return _trap_action_name[action]; | |
| 1826 static char buf[20]; | |
| 1827 sprintf(buf, "action%d", action); | |
| 1828 return buf; | |
| 1829 } | |
| 1830 | |
| 1831 // This is used for debugging and diagnostics, including hotspot.log output. | |
| 1832 const char* Deoptimization::format_trap_request(char* buf, size_t buflen, | |
| 1833 int trap_request) { | |
| 1834 jint unloaded_class_index = trap_request_index(trap_request); | |
| 1835 const char* reason = trap_reason_name(trap_request_reason(trap_request)); | |
| 1836 const char* action = trap_action_name(trap_request_action(trap_request)); | |
| 1837 size_t len; | |
| 1838 if (unloaded_class_index < 0) { | |
| 1839 len = jio_snprintf(buf, buflen, "reason='%s' action='%s'", | |
| 1840 reason, action); | |
| 1841 } else { | |
| 1842 len = jio_snprintf(buf, buflen, "reason='%s' action='%s' index='%d'", | |
| 1843 reason, action, unloaded_class_index); | |
| 1844 } | |
| 1845 if (len >= buflen) | |
| 1846 buf[buflen-1] = '\0'; | |
| 1847 return buf; | |
| 1848 } | |
| 1849 | |
| 1850 juint Deoptimization::_deoptimization_hist | |
| 1851 [Deoptimization::Reason_LIMIT] | |
| 1852 [1 + Deoptimization::Action_LIMIT] | |
| 1853 [Deoptimization::BC_CASE_LIMIT] | |
| 1854 = {0}; | |
| 1855 | |
| 1856 enum { | |
| 1857 LSB_BITS = 8, | |
| 1858 LSB_MASK = right_n_bits(LSB_BITS) | |
| 1859 }; | |
| 1860 | |
| 1861 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
| 1862 Bytecodes::Code bc) { | |
| 1863 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
| 1864 assert(action >= 0 && action < Action_LIMIT, "oob"); | |
| 1865 _deoptimization_hist[Reason_none][0][0] += 1; // total | |
| 1866 _deoptimization_hist[reason][0][0] += 1; // per-reason total | |
| 1867 juint* cases = _deoptimization_hist[reason][1+action]; | |
| 1868 juint* bc_counter_addr = NULL; | |
| 1869 juint bc_counter = 0; | |
| 1870 // Look for an unused counter, or an exact match to this BC. | |
| 1871 if (bc != Bytecodes::_illegal) { | |
| 1872 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
| 1873 juint* counter_addr = &cases[bc_case]; | |
| 1874 juint counter = *counter_addr; | |
| 1875 if ((counter == 0 && bc_counter_addr == NULL) | |
| 1876 || (Bytecodes::Code)(counter & LSB_MASK) == bc) { | |
| 1877 // this counter is either free or is already devoted to this BC | |
| 1878 bc_counter_addr = counter_addr; | |
| 1879 bc_counter = counter | bc; | |
| 1880 } | |
| 1881 } | |
| 1882 } | |
| 1883 if (bc_counter_addr == NULL) { | |
| 1884 // Overflow, or no given bytecode. | |
| 1885 bc_counter_addr = &cases[BC_CASE_LIMIT-1]; | |
| 1886 bc_counter = (*bc_counter_addr & ~LSB_MASK); // clear LSB | |
| 1887 } | |
| 1888 *bc_counter_addr = bc_counter + (1 << LSB_BITS); | |
| 1889 } | |
| 1890 | |
| 1891 jint Deoptimization::total_deoptimization_count() { | |
| 1892 return _deoptimization_hist[Reason_none][0][0]; | |
| 1893 } | |
| 1894 | |
| 1895 jint Deoptimization::deoptimization_count(DeoptReason reason) { | |
| 1896 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
| 1897 return _deoptimization_hist[reason][0][0]; | |
| 1898 } | |
| 1899 | |
| 1900 void Deoptimization::print_statistics() { | |
| 1901 juint total = total_deoptimization_count(); | |
| 1902 juint account = total; | |
| 1903 if (total != 0) { | |
| 1904 ttyLocker ttyl; | |
| 1905 if (xtty != NULL) xtty->head("statistics type='deoptimization'"); | |
| 1906 tty->print_cr("Deoptimization traps recorded:"); | |
| 1907 #define PRINT_STAT_LINE(name, r) \ | |
| 1908 tty->print_cr(" %4d (%4.1f%%) %s", (int)(r), ((r) * 100.0) / total, name); | |
| 1909 PRINT_STAT_LINE("total", total); | |
| 1910 // For each non-zero entry in the histogram, print the reason, | |
| 1911 // the action, and (if specifically known) the type of bytecode. | |
| 1912 for (int reason = 0; reason < Reason_LIMIT; reason++) { | |
| 1913 for (int action = 0; action < Action_LIMIT; action++) { | |
| 1914 juint* cases = _deoptimization_hist[reason][1+action]; | |
| 1915 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
| 1916 juint counter = cases[bc_case]; | |
| 1917 if (counter != 0) { | |
| 1918 char name[1*K]; | |
| 1919 Bytecodes::Code bc = (Bytecodes::Code)(counter & LSB_MASK); | |
| 1920 if (bc_case == BC_CASE_LIMIT && (int)bc == 0) | |
| 1921 bc = Bytecodes::_illegal; | |
| 1922 sprintf(name, "%s/%s/%s", | |
| 1923 trap_reason_name(reason), | |
| 1924 trap_action_name(action), | |
| 1925 Bytecodes::is_defined(bc)? Bytecodes::name(bc): "other"); | |
| 1926 juint r = counter >> LSB_BITS; | |
| 1927 tty->print_cr(" %40s: " UINT32_FORMAT " (%.1f%%)", name, r, (r * 100.0) / total); | |
| 1928 account -= r; | |
| 1929 } | |
| 1930 } | |
| 1931 } | |
| 1932 } | |
| 1933 if (account != 0) { | |
| 1934 PRINT_STAT_LINE("unaccounted", account); | |
| 1935 } | |
| 1936 #undef PRINT_STAT_LINE | |
| 1937 if (xtty != NULL) xtty->tail("statistics"); | |
| 1938 } | |
| 1939 } | |
| 1692 | 1940 #else // COMPILER2 || SHARK |
| 0 | 1941 |
| 1942 | |
| 1943 // Stubs for C1 only system. | |
| 1944 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
| 1945 return false; | |
| 1946 } | |
| 1947 | |
| 1948 const char* Deoptimization::trap_reason_name(int reason) { | |
| 1949 return "unknown"; | |
| 1950 } | |
| 1951 | |
| 1952 void Deoptimization::print_statistics() { | |
| 1953 // no output | |
| 1954 } | |
| 1955 | |
| 1956 void | |
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1957 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
| 0 | 1958 // no udpate |
| 1959 } | |
| 1960 | |
| 1961 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
| 1962 return 0; | |
| 1963 } | |
| 1964 | |
| 1965 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
| 1966 Bytecodes::Code bc) { | |
| 1967 // no update | |
| 1968 } | |
| 1969 | |
| 1970 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
| 1971 int trap_state) { | |
| 1972 jio_snprintf(buf, buflen, "#%d", trap_state); | |
| 1973 return buf; | |
| 1974 } | |
| 1975 | |
| 1692 | 1976 #endif // COMPILER2 || SHARK |