Mercurial > hg > truffle
annotate src/share/vm/runtime/deoptimization.cpp @ 17795:a9becfeecd1b
Merge
| author | kvn |
|---|---|
| date | Wed, 22 Jan 2014 17:42:23 -0800 |
| parents | 69dc1be43fce 2b8e28fdf503 |
| children | 8a9bb7821e28 62c54fcc0a35 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "code/debugInfoRec.hpp" | |
| 28 #include "code/nmethod.hpp" | |
| 29 #include "code/pcDesc.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "interpreter/bytecode.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/oopMapCache.hpp" | |
| 34 #include "memory/allocation.inline.hpp" | |
| 35 #include "memory/oopFactory.hpp" | |
| 36 #include "memory/resourceArea.hpp" | |
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37 #include "oops/method.hpp" |
| 1972 | 38 #include "oops/oop.inline.hpp" |
| 39 #include "prims/jvmtiThreadState.hpp" | |
| 40 #include "runtime/biasedLocking.hpp" | |
| 41 #include "runtime/compilationPolicy.hpp" | |
| 42 #include "runtime/deoptimization.hpp" | |
| 43 #include "runtime/interfaceSupport.hpp" | |
| 44 #include "runtime/sharedRuntime.hpp" | |
| 45 #include "runtime/signature.hpp" | |
| 46 #include "runtime/stubRoutines.hpp" | |
| 47 #include "runtime/thread.hpp" | |
| 48 #include "runtime/vframe.hpp" | |
| 49 #include "runtime/vframeArray.hpp" | |
| 50 #include "runtime/vframe_hp.hpp" | |
| 51 #include "utilities/events.hpp" | |
| 52 #include "utilities/xmlstream.hpp" | |
| 53 #ifdef TARGET_ARCH_x86 | |
| 54 # include "vmreg_x86.inline.hpp" | |
| 55 #endif | |
| 56 #ifdef TARGET_ARCH_sparc | |
| 57 # include "vmreg_sparc.inline.hpp" | |
| 58 #endif | |
| 59 #ifdef TARGET_ARCH_zero | |
| 60 # include "vmreg_zero.inline.hpp" | |
| 61 #endif | |
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62 #ifdef TARGET_ARCH_arm |
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63 # include "vmreg_arm.inline.hpp" |
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64 #endif |
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65 #ifdef TARGET_ARCH_ppc |
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66 # include "vmreg_ppc.inline.hpp" |
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67 #endif |
| 1972 | 68 #ifdef COMPILER2 |
| 69 #ifdef TARGET_ARCH_MODEL_x86_32 | |
| 70 # include "adfiles/ad_x86_32.hpp" | |
| 71 #endif | |
| 72 #ifdef TARGET_ARCH_MODEL_x86_64 | |
| 73 # include "adfiles/ad_x86_64.hpp" | |
| 74 #endif | |
| 75 #ifdef TARGET_ARCH_MODEL_sparc | |
| 76 # include "adfiles/ad_sparc.hpp" | |
| 77 #endif | |
| 78 #ifdef TARGET_ARCH_MODEL_zero | |
| 79 # include "adfiles/ad_zero.hpp" | |
| 80 #endif | |
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81 #ifdef TARGET_ARCH_MODEL_arm |
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82 # include "adfiles/ad_arm.hpp" |
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83 #endif |
| 14391 | 84 #ifdef TARGET_ARCH_MODEL_ppc_32 |
| 85 # include "adfiles/ad_ppc_32.hpp" | |
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86 #endif |
| 14391 | 87 #ifdef TARGET_ARCH_MODEL_ppc_64 |
| 88 # include "adfiles/ad_ppc_64.hpp" | |
| 1972 | 89 #endif |
| 14391 | 90 #endif // COMPILER2 |
| 0 | 91 |
| 92 bool DeoptimizationMarker::_is_active = false; | |
| 93 | |
| 94 Deoptimization::UnrollBlock::UnrollBlock(int size_of_deoptimized_frame, | |
| 95 int caller_adjustment, | |
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96 int caller_actual_parameters, |
| 0 | 97 int number_of_frames, |
| 98 intptr_t* frame_sizes, | |
| 99 address* frame_pcs, | |
| 100 BasicType return_type) { | |
| 101 _size_of_deoptimized_frame = size_of_deoptimized_frame; | |
| 102 _caller_adjustment = caller_adjustment; | |
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103 _caller_actual_parameters = caller_actual_parameters; |
| 0 | 104 _number_of_frames = number_of_frames; |
| 105 _frame_sizes = frame_sizes; | |
| 106 _frame_pcs = frame_pcs; | |
| 6197 | 107 _register_block = NEW_C_HEAP_ARRAY(intptr_t, RegisterMap::reg_count * 2, mtCompiler); |
| 0 | 108 _return_type = return_type; |
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109 _initial_info = 0; |
| 0 | 110 // PD (x86 only) |
| 111 _counter_temp = 0; | |
| 112 _unpack_kind = 0; | |
| 113 _sender_sp_temp = 0; | |
| 114 | |
| 115 _total_frame_sizes = size_of_frames(); | |
| 116 } | |
| 117 | |
| 118 | |
| 119 Deoptimization::UnrollBlock::~UnrollBlock() { | |
| 6197 | 120 FREE_C_HEAP_ARRAY(intptr_t, _frame_sizes, mtCompiler); |
| 121 FREE_C_HEAP_ARRAY(intptr_t, _frame_pcs, mtCompiler); | |
| 122 FREE_C_HEAP_ARRAY(intptr_t, _register_block, mtCompiler); | |
| 0 | 123 } |
| 124 | |
| 125 | |
| 126 intptr_t* Deoptimization::UnrollBlock::value_addr_at(int register_number) const { | |
| 127 assert(register_number < RegisterMap::reg_count, "checking register number"); | |
| 128 return &_register_block[register_number * 2]; | |
| 129 } | |
| 130 | |
| 131 | |
| 132 | |
| 133 int Deoptimization::UnrollBlock::size_of_frames() const { | |
| 134 // Acount first for the adjustment of the initial frame | |
| 135 int result = _caller_adjustment; | |
| 136 for (int index = 0; index < number_of_frames(); index++) { | |
| 137 result += frame_sizes()[index]; | |
| 138 } | |
| 139 return result; | |
| 140 } | |
| 141 | |
| 142 | |
| 143 void Deoptimization::UnrollBlock::print() { | |
| 144 ttyLocker ttyl; | |
| 145 tty->print_cr("UnrollBlock"); | |
| 146 tty->print_cr(" size_of_deoptimized_frame = %d", _size_of_deoptimized_frame); | |
| 147 tty->print( " frame_sizes: "); | |
| 148 for (int index = 0; index < number_of_frames(); index++) { | |
| 149 tty->print("%d ", frame_sizes()[index]); | |
| 150 } | |
| 151 tty->cr(); | |
| 152 } | |
| 153 | |
| 154 | |
| 155 // In order to make fetch_unroll_info work properly with escape | |
| 156 // analysis, The method was changed from JRT_LEAF to JRT_BLOCK_ENTRY and | |
| 157 // ResetNoHandleMark and HandleMark were removed from it. The actual reallocation | |
| 158 // of previously eliminated objects occurs in realloc_objects, which is | |
| 159 // called from the method fetch_unroll_info_helper below. | |
| 160 JRT_BLOCK_ENTRY(Deoptimization::UnrollBlock*, Deoptimization::fetch_unroll_info(JavaThread* thread)) | |
| 161 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
| 162 // but makes the entry a little slower. There is however a little dance we have to | |
| 163 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
| 164 | |
| 165 // fetch_unroll_info() is called at the beginning of the deoptimization | |
| 166 // handler. Note this fact before we start generating temporary frames | |
| 167 // that can confuse an asynchronous stack walker. This counter is | |
| 168 // decremented at the end of unpack_frames(). | |
| 169 thread->inc_in_deopt_handler(); | |
| 170 | |
| 171 return fetch_unroll_info_helper(thread); | |
| 172 JRT_END | |
| 173 | |
| 174 | |
| 175 // This is factored, since it is both called from a JRT_LEAF (deoptimization) and a JRT_ENTRY (uncommon_trap) | |
| 176 Deoptimization::UnrollBlock* Deoptimization::fetch_unroll_info_helper(JavaThread* thread) { | |
| 177 | |
| 178 // Note: there is a safepoint safety issue here. No matter whether we enter | |
| 179 // via vanilla deopt or uncommon trap we MUST NOT stop at a safepoint once | |
| 180 // the vframeArray is created. | |
| 181 // | |
| 182 | |
| 183 // Allocate our special deoptimization ResourceMark | |
| 184 DeoptResourceMark* dmark = new DeoptResourceMark(thread); | |
| 185 assert(thread->deopt_mark() == NULL, "Pending deopt!"); | |
| 186 thread->set_deopt_mark(dmark); | |
| 187 | |
| 188 frame stub_frame = thread->last_frame(); // Makes stack walkable as side effect | |
| 189 RegisterMap map(thread, true); | |
| 190 RegisterMap dummy_map(thread, false); | |
| 191 // Now get the deoptee with a valid map | |
| 192 frame deoptee = stub_frame.sender(&map); | |
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193 // Set the deoptee nmethod |
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194 assert(thread->deopt_nmethod() == NULL, "Pending deopt!"); |
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195 thread->set_deopt_nmethod(deoptee.cb()->as_nmethod_or_null()); |
| 0 | 196 |
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197 if (VerifyStack) { |
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198 thread->validate_frame_layout(); |
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199 } |
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200 |
| 0 | 201 // Create a growable array of VFrames where each VFrame represents an inlined |
| 202 // Java frame. This storage is allocated with the usual system arena. | |
| 203 assert(deoptee.is_compiled_frame(), "Wrong frame type"); | |
| 204 GrowableArray<compiledVFrame*>* chunk = new GrowableArray<compiledVFrame*>(10); | |
| 205 vframe* vf = vframe::new_vframe(&deoptee, &map, thread); | |
| 206 while (!vf->is_top()) { | |
| 207 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
| 208 chunk->push(compiledVFrame::cast(vf)); | |
| 209 vf = vf->sender(); | |
| 210 } | |
| 211 assert(vf->is_compiled_frame(), "Wrong frame type"); | |
| 212 chunk->push(compiledVFrame::cast(vf)); | |
| 213 | |
| 214 #ifdef COMPILER2 | |
| 215 // Reallocate the non-escaping objects and restore their fields. Then | |
| 216 // relock objects if synchronization on them was eliminated. | |
| 4777 | 217 if (DoEscapeAnalysis || EliminateNestedLocks) { |
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218 if (EliminateAllocations) { |
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219 assert (chunk->at(0)->scope() != NULL,"expect only compiled java frames"); |
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220 GrowableArray<ScopeValue*>* objects = chunk->at(0)->scope()->objects(); |
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221 |
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222 // The flag return_oop() indicates call sites which return oop |
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223 // in compiled code. Such sites include java method calls, |
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224 // runtime calls (for example, used to allocate new objects/arrays |
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225 // on slow code path) and any other calls generated in compiled code. |
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226 // It is not guaranteed that we can get such information here only |
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227 // by analyzing bytecode in deoptimized frames. This is why this flag |
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228 // is set during method compilation (see Compile::Process_OopMap_Node()). |
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229 bool save_oop_result = chunk->at(0)->scope()->return_oop(); |
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230 Handle return_value; |
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231 if (save_oop_result) { |
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232 // Reallocation may trigger GC. If deoptimization happened on return from |
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233 // call which returns oop we need to save it since it is not in oopmap. |
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234 oop result = deoptee.saved_oop_result(&map); |
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235 assert(result == NULL || result->is_oop(), "must be oop"); |
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236 return_value = Handle(thread, result); |
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237 assert(Universe::heap()->is_in_or_null(result), "must be heap pointer"); |
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238 if (TraceDeoptimization) { |
| 6843 | 239 ttyLocker ttyl; |
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240 tty->print_cr("SAVED OOP RESULT " INTPTR_FORMAT " in thread " INTPTR_FORMAT, (void *)result, thread); |
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241 } |
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242 } |
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243 bool reallocated = false; |
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244 if (objects != NULL) { |
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245 JRT_BLOCK |
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246 reallocated = realloc_objects(thread, &deoptee, objects, THREAD); |
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247 JRT_END |
| 0 | 248 } |
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249 if (reallocated) { |
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250 reassign_fields(&deoptee, &map, objects); |
| 0 | 251 #ifndef PRODUCT |
| 252 if (TraceDeoptimization) { | |
| 253 ttyLocker ttyl; | |
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254 tty->print_cr("REALLOC OBJECTS in thread " INTPTR_FORMAT, thread); |
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255 print_objects(objects); |
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256 } |
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257 #endif |
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258 } |
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259 if (save_oop_result) { |
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260 // Restore result. |
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261 deoptee.set_saved_oop_result(&map, return_value()); |
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262 } |
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263 } |
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264 if (EliminateLocks) { |
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265 #ifndef PRODUCT |
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266 bool first = true; |
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267 #endif |
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268 for (int i = 0; i < chunk->length(); i++) { |
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269 compiledVFrame* cvf = chunk->at(i); |
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270 assert (cvf->scope() != NULL,"expect only compiled java frames"); |
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271 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); |
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272 if (monitors->is_nonempty()) { |
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273 relock_objects(monitors, thread); |
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274 #ifndef PRODUCT |
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275 if (TraceDeoptimization) { |
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276 ttyLocker ttyl; |
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277 for (int j = 0; j < monitors->length(); j++) { |
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278 MonitorInfo* mi = monitors->at(j); |
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279 if (mi->eliminated()) { |
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280 if (first) { |
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281 first = false; |
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282 tty->print_cr("RELOCK OBJECTS in thread " INTPTR_FORMAT, thread); |
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283 } |
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284 tty->print_cr(" object <" INTPTR_FORMAT "> locked", (void *)mi->owner()); |
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285 } |
| 0 | 286 } |
| 287 } | |
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288 #endif |
| 0 | 289 } |
| 290 } | |
| 291 } | |
| 292 } | |
| 293 #endif // COMPILER2 | |
| 294 // Ensure that no safepoint is taken after pointers have been stored | |
| 295 // in fields of rematerialized objects. If a safepoint occurs from here on | |
| 296 // out the java state residing in the vframeArray will be missed. | |
| 297 No_Safepoint_Verifier no_safepoint; | |
| 298 | |
| 299 vframeArray* array = create_vframeArray(thread, deoptee, &map, chunk); | |
| 300 | |
| 301 assert(thread->vframe_array_head() == NULL, "Pending deopt!");; | |
| 302 thread->set_vframe_array_head(array); | |
| 303 | |
| 304 // Now that the vframeArray has been created if we have any deferred local writes | |
| 305 // added by jvmti then we can free up that structure as the data is now in the | |
| 306 // vframeArray | |
| 307 | |
| 308 if (thread->deferred_locals() != NULL) { | |
| 309 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread->deferred_locals(); | |
| 310 int i = 0; | |
| 311 do { | |
| 312 // Because of inlining we could have multiple vframes for a single frame | |
| 313 // and several of the vframes could have deferred writes. Find them all. | |
| 314 if (list->at(i)->id() == array->original().id()) { | |
| 315 jvmtiDeferredLocalVariableSet* dlv = list->at(i); | |
| 316 list->remove_at(i); | |
| 317 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 318 delete dlv; | |
| 319 } else { | |
| 320 i++; | |
| 321 } | |
| 322 } while ( i < list->length() ); | |
| 323 if (list->length() == 0) { | |
| 324 thread->set_deferred_locals(NULL); | |
| 325 // free the list and elements back to C heap. | |
| 326 delete list; | |
| 327 } | |
| 328 | |
| 329 } | |
| 330 | |
| 1692 | 331 #ifndef SHARK |
| 0 | 332 // Compute the caller frame based on the sender sp of stub_frame and stored frame sizes info. |
| 333 CodeBlob* cb = stub_frame.cb(); | |
| 334 // Verify we have the right vframeArray | |
| 335 assert(cb->frame_size() >= 0, "Unexpected frame size"); | |
| 336 intptr_t* unpack_sp = stub_frame.sp() + cb->frame_size(); | |
| 337 | |
| 1204 | 338 // If the deopt call site is a MethodHandle invoke call site we have |
| 339 // to adjust the unpack_sp. | |
| 340 nmethod* deoptee_nm = deoptee.cb()->as_nmethod_or_null(); | |
| 341 if (deoptee_nm != NULL && deoptee_nm->is_method_handle_return(deoptee.pc())) | |
| 342 unpack_sp = deoptee.unextended_sp(); | |
| 343 | |
| 0 | 344 #ifdef ASSERT |
| 345 assert(cb->is_deoptimization_stub() || cb->is_uncommon_trap_stub(), "just checking"); | |
| 346 #endif | |
| 1692 | 347 #else |
| 348 intptr_t* unpack_sp = stub_frame.sender(&dummy_map).unextended_sp(); | |
| 349 #endif // !SHARK | |
| 350 | |
| 0 | 351 // This is a guarantee instead of an assert because if vframe doesn't match |
| 352 // we will unpack the wrong deoptimized frame and wind up in strange places | |
| 353 // where it will be very difficult to figure out what went wrong. Better | |
| 354 // to die an early death here than some very obscure death later when the | |
| 355 // trail is cold. | |
| 356 // Note: on ia64 this guarantee can be fooled by frames with no memory stack | |
| 357 // in that it will fail to detect a problem when there is one. This needs | |
| 358 // more work in tiger timeframe. | |
| 359 guarantee(array->unextended_sp() == unpack_sp, "vframe_array_head must contain the vframeArray to unpack"); | |
| 360 | |
| 361 int number_of_frames = array->frames(); | |
| 362 | |
| 363 // Compute the vframes' sizes. Note that frame_sizes[] entries are ordered from outermost to innermost | |
| 364 // virtual activation, which is the reverse of the elements in the vframes array. | |
| 6197 | 365 intptr_t* frame_sizes = NEW_C_HEAP_ARRAY(intptr_t, number_of_frames, mtCompiler); |
| 0 | 366 // +1 because we always have an interpreter return address for the final slot. |
| 6197 | 367 address* frame_pcs = NEW_C_HEAP_ARRAY(address, number_of_frames + 1, mtCompiler); |
| 0 | 368 int popframe_extra_args = 0; |
| 369 // Create an interpreter return address for the stub to use as its return | |
| 370 // address so the skeletal frames are perfectly walkable | |
| 371 frame_pcs[number_of_frames] = Interpreter::deopt_entry(vtos, 0); | |
| 372 | |
| 373 // PopFrame requires that the preserved incoming arguments from the recently-popped topmost | |
| 374 // activation be put back on the expression stack of the caller for reexecution | |
| 375 if (JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) { | |
| 376 popframe_extra_args = in_words(thread->popframe_preserved_args_size_in_words()); | |
| 377 } | |
| 378 | |
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379 // Find the current pc for sender of the deoptee. Since the sender may have been deoptimized |
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380 // itself since the deoptee vframeArray was created we must get a fresh value of the pc rather |
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381 // than simply use array->sender.pc(). This requires us to walk the current set of frames |
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382 // |
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383 frame deopt_sender = stub_frame.sender(&dummy_map); // First is the deoptee frame |
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384 deopt_sender = deopt_sender.sender(&dummy_map); // Now deoptee caller |
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385 |
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386 // It's possible that the number of paramters at the call site is |
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387 // different than number of arguments in the callee when method |
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388 // handles are used. If the caller is interpreted get the real |
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389 // value so that the proper amount of space can be added to it's |
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390 // frame. |
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391 bool caller_was_method_handle = false; |
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392 if (deopt_sender.is_interpreted_frame()) { |
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393 methodHandle method = deopt_sender.interpreter_frame_method(); |
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394 Bytecode_invoke cur = Bytecode_invoke_check(method, deopt_sender.interpreter_frame_bci()); |
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395 if (cur.is_invokedynamic() || cur.is_invokehandle()) { |
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396 // Method handle invokes may involve fairly arbitrary chains of |
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397 // calls so it's impossible to know how much actual space the |
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398 // caller has for locals. |
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399 caller_was_method_handle = true; |
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400 } |
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401 } |
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402 |
| 0 | 403 // |
| 404 // frame_sizes/frame_pcs[0] oldest frame (int or c2i) | |
| 405 // frame_sizes/frame_pcs[1] next oldest frame (int) | |
| 406 // frame_sizes/frame_pcs[n] youngest frame (int) | |
| 407 // | |
| 408 // Now a pc in frame_pcs is actually the return address to the frame's caller (a frame | |
| 409 // owns the space for the return address to it's caller). Confusing ain't it. | |
| 410 // | |
| 411 // The vframe array can address vframes with indices running from | |
| 412 // 0.._frames-1. Index 0 is the youngest frame and _frame - 1 is the oldest (root) frame. | |
| 413 // When we create the skeletal frames we need the oldest frame to be in the zero slot | |
| 414 // in the frame_sizes/frame_pcs so the assembly code can do a trivial walk. | |
| 415 // so things look a little strange in this loop. | |
| 416 // | |
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417 int callee_parameters = 0; |
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418 int callee_locals = 0; |
| 0 | 419 for (int index = 0; index < array->frames(); index++ ) { |
| 420 // frame[number_of_frames - 1 ] = on_stack_size(youngest) | |
| 421 // frame[number_of_frames - 2 ] = on_stack_size(sender(youngest)) | |
| 422 // frame[number_of_frames - 3 ] = on_stack_size(sender(sender(youngest))) | |
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423 int caller_parms = callee_parameters; |
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424 if ((index == array->frames() - 1) && caller_was_method_handle) { |
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425 caller_parms = 0; |
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426 } |
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427 frame_sizes[number_of_frames - 1 - index] = BytesPerWord * array->element(index)->on_stack_size(caller_parms, |
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428 callee_parameters, |
| 0 | 429 callee_locals, |
| 430 index == 0, | |
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431 index == array->frames() - 1, |
| 0 | 432 popframe_extra_args); |
| 433 // This pc doesn't have to be perfect just good enough to identify the frame | |
| 434 // as interpreted so the skeleton frame will be walkable | |
| 435 // The correct pc will be set when the skeleton frame is completely filled out | |
| 436 // The final pc we store in the loop is wrong and will be overwritten below | |
| 437 frame_pcs[number_of_frames - 1 - index ] = Interpreter::deopt_entry(vtos, 0) - frame::pc_return_offset; | |
| 438 | |
| 439 callee_parameters = array->element(index)->method()->size_of_parameters(); | |
| 440 callee_locals = array->element(index)->method()->max_locals(); | |
| 441 popframe_extra_args = 0; | |
| 442 } | |
| 443 | |
| 444 // Compute whether the root vframe returns a float or double value. | |
| 445 BasicType return_type; | |
| 446 { | |
| 447 HandleMark hm; | |
| 448 methodHandle method(thread, array->element(0)->method()); | |
| 2142 | 449 Bytecode_invoke invoke = Bytecode_invoke_check(method, array->element(0)->bci()); |
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450 return_type = invoke.is_valid() ? invoke.result_type() : T_ILLEGAL; |
| 0 | 451 } |
| 452 | |
| 453 // Compute information for handling adapters and adjusting the frame size of the caller. | |
| 454 int caller_adjustment = 0; | |
| 455 | |
| 456 // Compute the amount the oldest interpreter frame will have to adjust | |
| 457 // its caller's stack by. If the caller is a compiled frame then | |
| 458 // we pretend that the callee has no parameters so that the | |
| 459 // extension counts for the full amount of locals and not just | |
| 460 // locals-parms. This is because without a c2i adapter the parm | |
| 461 // area as created by the compiled frame will not be usable by | |
| 462 // the interpreter. (Depending on the calling convention there | |
| 463 // may not even be enough space). | |
| 464 | |
| 465 // QQQ I'd rather see this pushed down into last_frame_adjust | |
| 466 // and have it take the sender (aka caller). | |
| 467 | |
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468 if (deopt_sender.is_compiled_frame() || caller_was_method_handle) { |
| 0 | 469 caller_adjustment = last_frame_adjust(0, callee_locals); |
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470 } else if (callee_locals > callee_parameters) { |
| 0 | 471 // The caller frame may need extending to accommodate |
| 472 // non-parameter locals of the first unpacked interpreted frame. | |
| 473 // Compute that adjustment. | |
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474 caller_adjustment = last_frame_adjust(callee_parameters, callee_locals); |
| 0 | 475 } |
| 476 | |
| 477 // If the sender is deoptimized the we must retrieve the address of the handler | |
| 478 // since the frame will "magically" show the original pc before the deopt | |
| 479 // and we'd undo the deopt. | |
| 480 | |
| 481 frame_pcs[0] = deopt_sender.raw_pc(); | |
| 482 | |
| 1692 | 483 #ifndef SHARK |
| 0 | 484 assert(CodeCache::find_blob_unsafe(frame_pcs[0]) != NULL, "bad pc"); |
| 1692 | 485 #endif // SHARK |
| 0 | 486 |
| 487 UnrollBlock* info = new UnrollBlock(array->frame_size() * BytesPerWord, | |
| 488 caller_adjustment * BytesPerWord, | |
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489 caller_was_method_handle ? 0 : callee_parameters, |
| 0 | 490 number_of_frames, |
| 491 frame_sizes, | |
| 492 frame_pcs, | |
| 493 return_type); | |
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494 // On some platforms, we need a way to pass some platform dependent |
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495 // information to the unpacking code so the skeletal frames come out |
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496 // correct (initial fp value, unextended sp, ...) |
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497 info->set_initial_info((intptr_t) array->sender().initial_deoptimization_info()); |
| 0 | 498 |
| 499 if (array->frames() > 1) { | |
| 500 if (VerifyStack && TraceDeoptimization) { | |
| 6843 | 501 ttyLocker ttyl; |
| 0 | 502 tty->print_cr("Deoptimizing method containing inlining"); |
| 503 } | |
| 504 } | |
| 505 | |
| 506 array->set_unroll_block(info); | |
| 507 return info; | |
| 508 } | |
| 509 | |
| 510 // Called to cleanup deoptimization data structures in normal case | |
| 511 // after unpacking to stack and when stack overflow error occurs | |
| 512 void Deoptimization::cleanup_deopt_info(JavaThread *thread, | |
| 513 vframeArray *array) { | |
| 514 | |
| 515 // Get array if coming from exception | |
| 516 if (array == NULL) { | |
| 517 array = thread->vframe_array_head(); | |
| 518 } | |
| 519 thread->set_vframe_array_head(NULL); | |
| 520 | |
| 521 // Free the previous UnrollBlock | |
| 522 vframeArray* old_array = thread->vframe_array_last(); | |
| 523 thread->set_vframe_array_last(array); | |
| 524 | |
| 525 if (old_array != NULL) { | |
| 526 UnrollBlock* old_info = old_array->unroll_block(); | |
| 527 old_array->set_unroll_block(NULL); | |
| 528 delete old_info; | |
| 529 delete old_array; | |
| 530 } | |
| 531 | |
| 532 // Deallocate any resource creating in this routine and any ResourceObjs allocated | |
| 533 // inside the vframeArray (StackValueCollections) | |
| 534 | |
| 535 delete thread->deopt_mark(); | |
| 536 thread->set_deopt_mark(NULL); | |
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537 thread->set_deopt_nmethod(NULL); |
| 0 | 538 |
| 539 | |
| 540 if (JvmtiExport::can_pop_frame()) { | |
| 541 #ifndef CC_INTERP | |
| 542 // Regardless of whether we entered this routine with the pending | |
| 543 // popframe condition bit set, we should always clear it now | |
| 544 thread->clear_popframe_condition(); | |
| 545 #else | |
| 546 // C++ interpeter will clear has_pending_popframe when it enters | |
| 547 // with method_resume. For deopt_resume2 we clear it now. | |
| 548 if (thread->popframe_forcing_deopt_reexecution()) | |
| 549 thread->clear_popframe_condition(); | |
| 550 #endif /* CC_INTERP */ | |
| 551 } | |
| 552 | |
| 553 // unpack_frames() is called at the end of the deoptimization handler | |
| 554 // and (in C2) at the end of the uncommon trap handler. Note this fact | |
| 555 // so that an asynchronous stack walker can work again. This counter is | |
| 556 // incremented at the beginning of fetch_unroll_info() and (in C2) at | |
| 557 // the beginning of uncommon_trap(). | |
| 558 thread->dec_in_deopt_handler(); | |
| 559 } | |
| 560 | |
| 561 | |
| 562 // Return BasicType of value being returned | |
| 563 JRT_LEAF(BasicType, Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)) | |
| 564 | |
| 565 // We are already active int he special DeoptResourceMark any ResourceObj's we | |
| 566 // allocate will be freed at the end of the routine. | |
| 567 | |
| 568 // It is actually ok to allocate handles in a leaf method. It causes no safepoints, | |
| 569 // but makes the entry a little slower. There is however a little dance we have to | |
| 570 // do in debug mode to get around the NoHandleMark code in the JRT_LEAF macro | |
| 571 ResetNoHandleMark rnhm; // No-op in release/product versions | |
| 572 HandleMark hm; | |
| 573 | |
| 574 frame stub_frame = thread->last_frame(); | |
| 575 | |
| 576 // Since the frame to unpack is the top frame of this thread, the vframe_array_head | |
| 577 // must point to the vframeArray for the unpack frame. | |
| 578 vframeArray* array = thread->vframe_array_head(); | |
| 579 | |
| 580 #ifndef PRODUCT | |
| 581 if (TraceDeoptimization) { | |
| 6843 | 582 ttyLocker ttyl; |
| 0 | 583 tty->print_cr("DEOPT UNPACKING thread " INTPTR_FORMAT " vframeArray " INTPTR_FORMAT " mode %d", thread, array, exec_mode); |
| 584 } | |
| 585 #endif | |
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586 Events::log(thread, "DEOPT UNPACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT " mode %d", |
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587 stub_frame.pc(), stub_frame.sp(), exec_mode); |
| 0 | 588 |
| 589 UnrollBlock* info = array->unroll_block(); | |
| 590 | |
| 591 // Unpack the interpreter frames and any adapter frame (c2 only) we might create. | |
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592 array->unpack_to_stack(stub_frame, exec_mode, info->caller_actual_parameters()); |
| 0 | 593 |
| 594 BasicType bt = info->return_type(); | |
| 595 | |
| 596 // If we have an exception pending, claim that the return type is an oop | |
| 597 // so the deopt_blob does not overwrite the exception_oop. | |
| 598 | |
| 599 if (exec_mode == Unpack_exception) | |
| 600 bt = T_OBJECT; | |
| 601 | |
| 602 // Cleanup thread deopt data | |
| 603 cleanup_deopt_info(thread, array); | |
| 604 | |
| 605 #ifndef PRODUCT | |
| 606 if (VerifyStack) { | |
| 607 ResourceMark res_mark; | |
| 608 | |
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609 thread->validate_frame_layout(); |
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610 |
| 0 | 611 // Verify that the just-unpacked frames match the interpreter's |
| 612 // notions of expression stack and locals | |
| 613 vframeArray* cur_array = thread->vframe_array_last(); | |
| 614 RegisterMap rm(thread, false); | |
| 615 rm.set_include_argument_oops(false); | |
| 616 bool is_top_frame = true; | |
| 617 int callee_size_of_parameters = 0; | |
| 618 int callee_max_locals = 0; | |
| 619 for (int i = 0; i < cur_array->frames(); i++) { | |
| 620 vframeArrayElement* el = cur_array->element(i); | |
| 621 frame* iframe = el->iframe(); | |
| 622 guarantee(iframe->is_interpreted_frame(), "Wrong frame type"); | |
| 623 | |
| 624 // Get the oop map for this bci | |
| 625 InterpreterOopMap mask; | |
| 626 int cur_invoke_parameter_size = 0; | |
| 627 bool try_next_mask = false; | |
| 628 int next_mask_expression_stack_size = -1; | |
| 629 int top_frame_expression_stack_adjustment = 0; | |
| 630 methodHandle mh(thread, iframe->interpreter_frame_method()); | |
| 631 OopMapCache::compute_one_oop_map(mh, iframe->interpreter_frame_bci(), &mask); | |
| 632 BytecodeStream str(mh); | |
| 633 str.set_start(iframe->interpreter_frame_bci()); | |
| 634 int max_bci = mh->code_size(); | |
| 635 // Get to the next bytecode if possible | |
| 636 assert(str.bci() < max_bci, "bci in interpreter frame out of bounds"); | |
| 637 // Check to see if we can grab the number of outgoing arguments | |
| 638 // at an uncommon trap for an invoke (where the compiler | |
| 639 // generates debug info before the invoke has executed) | |
| 640 Bytecodes::Code cur_code = str.next(); | |
| 10390 | 641 if (cur_code == Bytecodes::_invokevirtual || |
| 642 cur_code == Bytecodes::_invokespecial || | |
| 643 cur_code == Bytecodes::_invokestatic || | |
| 644 cur_code == Bytecodes::_invokeinterface || | |
| 645 cur_code == Bytecodes::_invokedynamic) { | |
| 2142 | 646 Bytecode_invoke invoke(mh, iframe->interpreter_frame_bci()); |
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647 Symbol* signature = invoke.signature(); |
| 0 | 648 ArgumentSizeComputer asc(signature); |
| 649 cur_invoke_parameter_size = asc.size(); | |
| 10390 | 650 if (invoke.has_receiver()) { |
| 0 | 651 // Add in receiver |
| 652 ++cur_invoke_parameter_size; | |
| 653 } | |
| 10390 | 654 if (i != 0 && !invoke.is_invokedynamic() && MethodHandles::has_member_arg(invoke.klass(), invoke.name())) { |
| 655 callee_size_of_parameters++; | |
| 656 } | |
| 0 | 657 } |
| 658 if (str.bci() < max_bci) { | |
| 659 Bytecodes::Code bc = str.next(); | |
| 660 if (bc >= 0) { | |
| 661 // The interpreter oop map generator reports results before | |
| 662 // the current bytecode has executed except in the case of | |
| 663 // calls. It seems to be hard to tell whether the compiler | |
| 664 // has emitted debug information matching the "state before" | |
| 665 // a given bytecode or the state after, so we try both | |
| 666 switch (cur_code) { | |
| 667 case Bytecodes::_invokevirtual: | |
| 668 case Bytecodes::_invokespecial: | |
| 669 case Bytecodes::_invokestatic: | |
| 670 case Bytecodes::_invokeinterface: | |
| 10390 | 671 case Bytecodes::_invokedynamic: |
| 0 | 672 case Bytecodes::_athrow: |
| 673 break; | |
| 674 default: { | |
| 675 InterpreterOopMap next_mask; | |
| 676 OopMapCache::compute_one_oop_map(mh, str.bci(), &next_mask); | |
| 677 next_mask_expression_stack_size = next_mask.expression_stack_size(); | |
| 678 // Need to subtract off the size of the result type of | |
| 679 // the bytecode because this is not described in the | |
| 680 // debug info but returned to the interpreter in the TOS | |
| 681 // caching register | |
| 682 BasicType bytecode_result_type = Bytecodes::result_type(cur_code); | |
| 683 if (bytecode_result_type != T_ILLEGAL) { | |
| 684 top_frame_expression_stack_adjustment = type2size[bytecode_result_type]; | |
| 685 } | |
| 686 assert(top_frame_expression_stack_adjustment >= 0, ""); | |
| 687 try_next_mask = true; | |
| 688 break; | |
| 689 } | |
| 690 } | |
| 691 } | |
| 692 } | |
| 693 | |
| 694 // Verify stack depth and oops in frame | |
| 695 // This assertion may be dependent on the platform we're running on and may need modification (tested on x86 and sparc) | |
| 696 if (!( | |
| 697 /* SPARC */ | |
| 698 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_size_of_parameters) || | |
| 699 /* x86 */ | |
| 700 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + callee_max_locals) || | |
| 701 (try_next_mask && | |
| 702 (iframe->interpreter_frame_expression_stack_size() == (next_mask_expression_stack_size - | |
| 703 top_frame_expression_stack_adjustment))) || | |
| 704 (is_top_frame && (exec_mode == Unpack_exception) && iframe->interpreter_frame_expression_stack_size() == 0) || | |
| 705 (is_top_frame && (exec_mode == Unpack_uncommon_trap || exec_mode == Unpack_reexecute) && | |
| 706 (iframe->interpreter_frame_expression_stack_size() == mask.expression_stack_size() + cur_invoke_parameter_size)) | |
| 707 )) { | |
| 708 ttyLocker ttyl; | |
| 709 | |
| 710 // Print out some information that will help us debug the problem | |
| 711 tty->print_cr("Wrong number of expression stack elements during deoptimization"); | |
| 712 tty->print_cr(" Error occurred while verifying frame %d (0..%d, 0 is topmost)", i, cur_array->frames() - 1); | |
| 713 tty->print_cr(" Fabricated interpreter frame had %d expression stack elements", | |
| 714 iframe->interpreter_frame_expression_stack_size()); | |
| 715 tty->print_cr(" Interpreter oop map had %d expression stack elements", mask.expression_stack_size()); | |
| 716 tty->print_cr(" try_next_mask = %d", try_next_mask); | |
| 717 tty->print_cr(" next_mask_expression_stack_size = %d", next_mask_expression_stack_size); | |
| 718 tty->print_cr(" callee_size_of_parameters = %d", callee_size_of_parameters); | |
| 719 tty->print_cr(" callee_max_locals = %d", callee_max_locals); | |
| 720 tty->print_cr(" top_frame_expression_stack_adjustment = %d", top_frame_expression_stack_adjustment); | |
| 721 tty->print_cr(" exec_mode = %d", exec_mode); | |
| 722 tty->print_cr(" cur_invoke_parameter_size = %d", cur_invoke_parameter_size); | |
| 723 tty->print_cr(" Thread = " INTPTR_FORMAT ", thread ID = " UINTX_FORMAT, thread, thread->osthread()->thread_id()); | |
| 724 tty->print_cr(" Interpreted frames:"); | |
| 725 for (int k = 0; k < cur_array->frames(); k++) { | |
| 726 vframeArrayElement* el = cur_array->element(k); | |
| 727 tty->print_cr(" %s (bci %d)", el->method()->name_and_sig_as_C_string(), el->bci()); | |
| 728 } | |
| 729 cur_array->print_on_2(tty); | |
| 730 guarantee(false, "wrong number of expression stack elements during deopt"); | |
| 731 } | |
| 732 VerifyOopClosure verify; | |
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733 iframe->oops_interpreted_do(&verify, NULL, &rm, false); |
| 0 | 734 callee_size_of_parameters = mh->size_of_parameters(); |
| 735 callee_max_locals = mh->max_locals(); | |
| 736 is_top_frame = false; | |
| 737 } | |
| 738 } | |
| 739 #endif /* !PRODUCT */ | |
| 740 | |
| 741 | |
| 742 return bt; | |
| 743 JRT_END | |
| 744 | |
| 745 | |
| 746 int Deoptimization::deoptimize_dependents() { | |
| 747 Threads::deoptimized_wrt_marked_nmethods(); | |
| 748 return 0; | |
| 749 } | |
| 750 | |
| 751 | |
| 752 #ifdef COMPILER2 | |
| 753 bool Deoptimization::realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS) { | |
| 754 Handle pending_exception(thread->pending_exception()); | |
| 755 const char* exception_file = thread->exception_file(); | |
| 756 int exception_line = thread->exception_line(); | |
| 757 thread->clear_pending_exception(); | |
| 758 | |
| 759 for (int i = 0; i < objects->length(); i++) { | |
| 760 assert(objects->at(i)->is_object(), "invalid debug information"); | |
| 761 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
| 762 | |
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763 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 764 oop obj = NULL; |
| 765 | |
| 766 if (k->oop_is_instance()) { | |
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767 InstanceKlass* ik = InstanceKlass::cast(k()); |
| 0 | 768 obj = ik->allocate_instance(CHECK_(false)); |
| 769 } else if (k->oop_is_typeArray()) { | |
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770 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
| 0 | 771 assert(sv->field_size() % type2size[ak->element_type()] == 0, "non-integral array length"); |
| 772 int len = sv->field_size() / type2size[ak->element_type()]; | |
| 773 obj = ak->allocate(len, CHECK_(false)); | |
| 774 } else if (k->oop_is_objArray()) { | |
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775 ObjArrayKlass* ak = ObjArrayKlass::cast(k()); |
| 0 | 776 obj = ak->allocate(sv->field_size(), CHECK_(false)); |
| 777 } | |
| 778 | |
| 779 assert(obj != NULL, "allocation failed"); | |
| 780 assert(sv->value().is_null(), "redundant reallocation"); | |
| 781 sv->set_value(obj); | |
| 782 } | |
| 783 | |
| 784 if (pending_exception.not_null()) { | |
| 785 thread->set_pending_exception(pending_exception(), exception_file, exception_line); | |
| 786 } | |
| 787 | |
| 788 return true; | |
| 789 } | |
| 790 | |
| 791 // This assumes that the fields are stored in ObjectValue in the same order | |
| 792 // they are yielded by do_nonstatic_fields. | |
| 793 class FieldReassigner: public FieldClosure { | |
| 794 frame* _fr; | |
| 795 RegisterMap* _reg_map; | |
| 796 ObjectValue* _sv; | |
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797 InstanceKlass* _ik; |
| 0 | 798 oop _obj; |
| 799 | |
| 800 int _i; | |
| 801 public: | |
| 802 FieldReassigner(frame* fr, RegisterMap* reg_map, ObjectValue* sv, oop obj) : | |
| 803 _fr(fr), _reg_map(reg_map), _sv(sv), _obj(obj), _i(0) {} | |
| 804 | |
| 805 int i() const { return _i; } | |
| 806 | |
| 807 | |
| 808 void do_field(fieldDescriptor* fd) { | |
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809 intptr_t val; |
| 0 | 810 StackValue* value = |
| 811 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(i())); | |
| 812 int offset = fd->offset(); | |
| 813 switch (fd->field_type()) { | |
| 814 case T_OBJECT: case T_ARRAY: | |
| 815 assert(value->type() == T_OBJECT, "Agreement."); | |
| 816 _obj->obj_field_put(offset, value->get_obj()()); | |
| 817 break; | |
| 818 | |
| 819 case T_LONG: case T_DOUBLE: { | |
| 820 assert(value->type() == T_INT, "Agreement."); | |
| 821 StackValue* low = | |
| 822 StackValue::create_stack_value(_fr, _reg_map, _sv->field_at(++_i)); | |
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823 #ifdef _LP64 |
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824 jlong res = (jlong)low->get_int(); |
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825 #else |
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826 #ifdef SPARC |
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827 // For SPARC we have to swap high and low words. |
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828 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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829 #else |
| 0 | 830 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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831 #endif //SPARC |
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832 #endif |
| 0 | 833 _obj->long_field_put(offset, res); |
| 834 break; | |
| 835 } | |
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836 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
| 0 | 837 case T_INT: case T_FLOAT: // 4 bytes. |
| 838 assert(value->type() == T_INT, "Agreement."); | |
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839 val = value->get_int(); |
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840 _obj->int_field_put(offset, (jint)*((jint*)&val)); |
| 0 | 841 break; |
| 842 | |
| 843 case T_SHORT: case T_CHAR: // 2 bytes | |
| 844 assert(value->type() == T_INT, "Agreement."); | |
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845 val = value->get_int(); |
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846 _obj->short_field_put(offset, (jshort)*((jint*)&val)); |
| 0 | 847 break; |
| 848 | |
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849 case T_BOOLEAN: case T_BYTE: // 1 byte |
| 0 | 850 assert(value->type() == T_INT, "Agreement."); |
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851 val = value->get_int(); |
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852 _obj->bool_field_put(offset, (jboolean)*((jint*)&val)); |
| 0 | 853 break; |
| 854 | |
| 855 default: | |
| 856 ShouldNotReachHere(); | |
| 857 } | |
| 858 _i++; | |
| 859 } | |
| 860 }; | |
| 861 | |
| 862 // restore elements of an eliminated type array | |
| 863 void Deoptimization::reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type) { | |
| 864 int index = 0; | |
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865 intptr_t val; |
| 0 | 866 |
| 867 for (int i = 0; i < sv->field_size(); i++) { | |
| 868 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
| 869 switch(type) { | |
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870 case T_LONG: case T_DOUBLE: { |
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871 assert(value->type() == T_INT, "Agreement."); |
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872 StackValue* low = |
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873 StackValue::create_stack_value(fr, reg_map, sv->field_at(++i)); |
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874 #ifdef _LP64 |
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875 jlong res = (jlong)low->get_int(); |
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876 #else |
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877 #ifdef SPARC |
|
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878 // For SPARC we have to swap high and low words. |
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879 jlong res = jlong_from((jint)low->get_int(), (jint)value->get_int()); |
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880 #else |
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881 jlong res = jlong_from((jint)value->get_int(), (jint)low->get_int()); |
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882 #endif //SPARC |
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883 #endif |
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884 obj->long_at_put(index, res); |
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885 break; |
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886 } |
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887 |
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888 // Have to cast to INT (32 bits) pointer to avoid little/big-endian problem. |
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889 case T_INT: case T_FLOAT: // 4 bytes. |
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890 assert(value->type() == T_INT, "Agreement."); |
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891 val = value->get_int(); |
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892 obj->int_at_put(index, (jint)*((jint*)&val)); |
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893 break; |
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894 |
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895 case T_SHORT: case T_CHAR: // 2 bytes |
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896 assert(value->type() == T_INT, "Agreement."); |
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897 val = value->get_int(); |
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898 obj->short_at_put(index, (jshort)*((jint*)&val)); |
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899 break; |
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900 |
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901 case T_BOOLEAN: case T_BYTE: // 1 byte |
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902 assert(value->type() == T_INT, "Agreement."); |
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903 val = value->get_int(); |
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904 obj->bool_at_put(index, (jboolean)*((jint*)&val)); |
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905 break; |
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906 |
| 0 | 907 default: |
| 908 ShouldNotReachHere(); | |
| 909 } | |
| 910 index++; | |
| 911 } | |
| 912 } | |
| 913 | |
| 914 | |
| 915 // restore fields of an eliminated object array | |
| 916 void Deoptimization::reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj) { | |
| 917 for (int i = 0; i < sv->field_size(); i++) { | |
| 918 StackValue* value = StackValue::create_stack_value(fr, reg_map, sv->field_at(i)); | |
| 919 assert(value->type() == T_OBJECT, "object element expected"); | |
| 920 obj->obj_at_put(i, value->get_obj()()); | |
| 921 } | |
| 922 } | |
| 923 | |
| 924 | |
| 925 // restore fields of all eliminated objects and arrays | |
| 926 void Deoptimization::reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects) { | |
| 927 for (int i = 0; i < objects->length(); i++) { | |
| 928 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
|
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929 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 930 Handle obj = sv->value(); |
| 931 assert(obj.not_null(), "reallocation was missed"); | |
| 932 | |
| 933 if (k->oop_is_instance()) { | |
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934 InstanceKlass* ik = InstanceKlass::cast(k()); |
| 0 | 935 FieldReassigner reassign(fr, reg_map, sv, obj()); |
| 936 ik->do_nonstatic_fields(&reassign); | |
| 937 } else if (k->oop_is_typeArray()) { | |
|
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938 TypeArrayKlass* ak = TypeArrayKlass::cast(k()); |
| 0 | 939 reassign_type_array_elements(fr, reg_map, sv, (typeArrayOop) obj(), ak->element_type()); |
| 940 } else if (k->oop_is_objArray()) { | |
| 941 reassign_object_array_elements(fr, reg_map, sv, (objArrayOop) obj()); | |
| 942 } | |
| 943 } | |
| 944 } | |
| 945 | |
| 946 | |
| 947 // relock objects for which synchronization was eliminated | |
|
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948 void Deoptimization::relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread) { |
| 0 | 949 for (int i = 0; i < monitors->length(); i++) { |
|
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950 MonitorInfo* mon_info = monitors->at(i); |
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951 if (mon_info->eliminated()) { |
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952 assert(mon_info->owner() != NULL, "reallocation was missed"); |
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953 Handle obj = Handle(mon_info->owner()); |
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954 markOop mark = obj->mark(); |
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955 if (UseBiasedLocking && mark->has_bias_pattern()) { |
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956 // New allocated objects may have the mark set to anonymously biased. |
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957 // Also the deoptimized method may called methods with synchronization |
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958 // where the thread-local object is bias locked to the current thread. |
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959 assert(mark->is_biased_anonymously() || |
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960 mark->biased_locker() == thread, "should be locked to current thread"); |
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961 // Reset mark word to unbiased prototype. |
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962 markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
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963 obj->set_mark(unbiased_prototype); |
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964 } |
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965 BasicLock* lock = mon_info->lock(); |
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966 ObjectSynchronizer::slow_enter(obj, lock, thread); |
| 0 | 967 } |
|
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968 assert(mon_info->owner()->is_locked(), "object must be locked now"); |
| 0 | 969 } |
| 970 } | |
| 971 | |
| 972 | |
| 973 #ifndef PRODUCT | |
| 974 // print information about reallocated objects | |
| 975 void Deoptimization::print_objects(GrowableArray<ScopeValue*>* objects) { | |
| 976 fieldDescriptor fd; | |
| 977 | |
| 978 for (int i = 0; i < objects->length(); i++) { | |
| 979 ObjectValue* sv = (ObjectValue*) objects->at(i); | |
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980 KlassHandle k(java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())); |
| 0 | 981 Handle obj = sv->value(); |
| 982 | |
|
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983 tty->print(" object <" INTPTR_FORMAT "> of type ", (void *)sv->value()()); |
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984 k->print_value(); |
| 0 | 985 tty->print(" allocated (%d bytes)", obj->size() * HeapWordSize); |
| 986 tty->cr(); | |
| 987 | |
| 988 if (Verbose) { | |
| 989 k->oop_print_on(obj(), tty); | |
| 990 } | |
| 991 } | |
| 992 } | |
| 993 #endif | |
| 994 #endif // COMPILER2 | |
| 995 | |
| 996 vframeArray* Deoptimization::create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk) { | |
|
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997 Events::log(thread, "DEOPT PACKING pc=" INTPTR_FORMAT " sp=" INTPTR_FORMAT, fr.pc(), fr.sp()); |
| 0 | 998 |
| 999 #ifndef PRODUCT | |
| 1000 if (TraceDeoptimization) { | |
| 1001 ttyLocker ttyl; | |
| 1002 tty->print("DEOPT PACKING thread " INTPTR_FORMAT " ", thread); | |
| 1003 fr.print_on(tty); | |
| 1004 tty->print_cr(" Virtual frames (innermost first):"); | |
| 1005 for (int index = 0; index < chunk->length(); index++) { | |
| 1006 compiledVFrame* vf = chunk->at(index); | |
| 1007 tty->print(" %2d - ", index); | |
| 1008 vf->print_value(); | |
| 1009 int bci = chunk->at(index)->raw_bci(); | |
| 1010 const char* code_name; | |
| 1011 if (bci == SynchronizationEntryBCI) { | |
| 1012 code_name = "sync entry"; | |
| 1013 } else { | |
| 2142 | 1014 Bytecodes::Code code = vf->method()->code_at(bci); |
| 0 | 1015 code_name = Bytecodes::name(code); |
| 1016 } | |
| 1017 tty->print(" - %s", code_name); | |
| 1018 tty->print_cr(" @ bci %d ", bci); | |
| 1019 if (Verbose) { | |
| 1020 vf->print(); | |
| 1021 tty->cr(); | |
| 1022 } | |
| 1023 } | |
| 1024 } | |
| 1025 #endif | |
| 1026 | |
| 1027 // Register map for next frame (used for stack crawl). We capture | |
| 1028 // the state of the deopt'ing frame's caller. Thus if we need to | |
| 1029 // stuff a C2I adapter we can properly fill in the callee-save | |
| 1030 // register locations. | |
| 1031 frame caller = fr.sender(reg_map); | |
| 1032 int frame_size = caller.sp() - fr.sp(); | |
| 1033 | |
| 1034 frame sender = caller; | |
| 1035 | |
| 1036 // Since the Java thread being deoptimized will eventually adjust it's own stack, | |
| 1037 // the vframeArray containing the unpacking information is allocated in the C heap. | |
| 1038 // For Compiler1, the caller of the deoptimized frame is saved for use by unpack_frames(). | |
| 1039 vframeArray* array = vframeArray::allocate(thread, frame_size, chunk, reg_map, sender, caller, fr); | |
| 1040 | |
| 1041 // Compare the vframeArray to the collected vframes | |
| 1042 assert(array->structural_compare(thread, chunk), "just checking"); | |
| 1043 | |
| 1044 #ifndef PRODUCT | |
| 1045 if (TraceDeoptimization) { | |
| 1046 ttyLocker ttyl; | |
| 1047 tty->print_cr(" Created vframeArray " INTPTR_FORMAT, array); | |
| 1048 } | |
| 1049 #endif // PRODUCT | |
| 1050 | |
| 1051 return array; | |
| 1052 } | |
| 1053 | |
| 1054 | |
| 1055 static void collect_monitors(compiledVFrame* cvf, GrowableArray<Handle>* objects_to_revoke) { | |
| 1056 GrowableArray<MonitorInfo*>* monitors = cvf->monitors(); | |
| 1057 for (int i = 0; i < monitors->length(); i++) { | |
| 1058 MonitorInfo* mon_info = monitors->at(i); | |
|
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1059 if (!mon_info->eliminated() && mon_info->owner() != NULL) { |
| 0 | 1060 objects_to_revoke->append(Handle(mon_info->owner())); |
| 1061 } | |
| 1062 } | |
| 1063 } | |
| 1064 | |
| 1065 | |
| 1066 void Deoptimization::revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map) { | |
| 1067 if (!UseBiasedLocking) { | |
| 1068 return; | |
| 1069 } | |
| 1070 | |
| 1071 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
| 1072 | |
| 1073 // Unfortunately we don't have a RegisterMap available in most of | |
| 1074 // the places we want to call this routine so we need to walk the | |
| 1075 // stack again to update the register map. | |
| 1076 if (map == NULL || !map->update_map()) { | |
| 1077 StackFrameStream sfs(thread, true); | |
| 1078 bool found = false; | |
| 1079 while (!found && !sfs.is_done()) { | |
| 1080 frame* cur = sfs.current(); | |
| 1081 sfs.next(); | |
| 1082 found = cur->id() == fr.id(); | |
| 1083 } | |
| 1084 assert(found, "frame to be deoptimized not found on target thread's stack"); | |
| 1085 map = sfs.register_map(); | |
| 1086 } | |
| 1087 | |
| 1088 vframe* vf = vframe::new_vframe(&fr, map, thread); | |
| 1089 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1090 // Revoke monitors' biases in all scopes | |
| 1091 while (!cvf->is_top()) { | |
| 1092 collect_monitors(cvf, objects_to_revoke); | |
| 1093 cvf = compiledVFrame::cast(cvf->sender()); | |
| 1094 } | |
| 1095 collect_monitors(cvf, objects_to_revoke); | |
| 1096 | |
| 1097 if (SafepointSynchronize::is_at_safepoint()) { | |
| 1098 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
| 1099 } else { | |
| 1100 BiasedLocking::revoke(objects_to_revoke); | |
| 1101 } | |
| 1102 } | |
| 1103 | |
| 1104 | |
| 1105 void Deoptimization::revoke_biases_of_monitors(CodeBlob* cb) { | |
| 1106 if (!UseBiasedLocking) { | |
| 1107 return; | |
| 1108 } | |
| 1109 | |
| 1110 assert(SafepointSynchronize::is_at_safepoint(), "must only be called from safepoint"); | |
| 1111 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); | |
| 1112 for (JavaThread* jt = Threads::first(); jt != NULL ; jt = jt->next()) { | |
| 1113 if (jt->has_last_Java_frame()) { | |
| 1114 StackFrameStream sfs(jt, true); | |
| 1115 while (!sfs.is_done()) { | |
| 1116 frame* cur = sfs.current(); | |
| 1117 if (cb->contains(cur->pc())) { | |
| 1118 vframe* vf = vframe::new_vframe(cur, sfs.register_map(), jt); | |
| 1119 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1120 // Revoke monitors' biases in all scopes | |
| 1121 while (!cvf->is_top()) { | |
| 1122 collect_monitors(cvf, objects_to_revoke); | |
| 1123 cvf = compiledVFrame::cast(cvf->sender()); | |
| 1124 } | |
| 1125 collect_monitors(cvf, objects_to_revoke); | |
| 1126 } | |
| 1127 sfs.next(); | |
| 1128 } | |
| 1129 } | |
| 1130 } | |
| 1131 BiasedLocking::revoke_at_safepoint(objects_to_revoke); | |
| 1132 } | |
| 1133 | |
| 1134 | |
| 1135 void Deoptimization::deoptimize_single_frame(JavaThread* thread, frame fr) { | |
| 1136 assert(fr.can_be_deoptimized(), "checking frame type"); | |
| 1137 | |
| 1138 gather_statistics(Reason_constraint, Action_none, Bytecodes::_illegal); | |
| 1139 | |
| 1140 // Patch the nmethod so that when execution returns to it we will | |
| 1141 // deopt the execution state and return to the interpreter. | |
| 1142 fr.deoptimize(thread); | |
| 1143 } | |
| 1144 | |
| 1145 void Deoptimization::deoptimize(JavaThread* thread, frame fr, RegisterMap *map) { | |
| 1146 // Deoptimize only if the frame comes from compile code. | |
| 1147 // Do not deoptimize the frame which is already patched | |
| 1148 // during the execution of the loops below. | |
| 1149 if (!fr.is_compiled_frame() || fr.is_deoptimized_frame()) { | |
| 1150 return; | |
| 1151 } | |
| 1152 ResourceMark rm; | |
| 1153 DeoptimizationMarker dm; | |
| 1154 if (UseBiasedLocking) { | |
| 1155 revoke_biases_of_monitors(thread, fr, map); | |
| 1156 } | |
| 1157 deoptimize_single_frame(thread, fr); | |
| 1158 | |
| 1159 } | |
| 1160 | |
| 1161 | |
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1162 void Deoptimization::deoptimize_frame_internal(JavaThread* thread, intptr_t* id) { |
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1163 assert(thread == Thread::current() || SafepointSynchronize::is_at_safepoint(), |
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1164 "can only deoptimize other thread at a safepoint"); |
| 0 | 1165 // Compute frame and register map based on thread and sp. |
| 1166 RegisterMap reg_map(thread, UseBiasedLocking); | |
| 1167 frame fr = thread->last_frame(); | |
| 1168 while (fr.id() != id) { | |
| 1169 fr = fr.sender(®_map); | |
| 1170 } | |
| 1171 deoptimize(thread, fr, ®_map); | |
| 1172 } | |
| 1173 | |
| 1174 | |
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1175 void Deoptimization::deoptimize_frame(JavaThread* thread, intptr_t* id) { |
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1176 if (thread == Thread::current()) { |
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1177 Deoptimization::deoptimize_frame_internal(thread, id); |
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1178 } else { |
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1179 VM_DeoptimizeFrame deopt(thread, id); |
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1180 VMThread::execute(&deopt); |
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1181 } |
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1182 } |
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1183 |
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1184 |
| 0 | 1185 // JVMTI PopFrame support |
| 1186 JRT_LEAF(void, Deoptimization::popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address)) | |
| 1187 { | |
| 1188 thread->popframe_preserve_args(in_ByteSize(bytes_to_save), start_address); | |
| 1189 } | |
| 1190 JRT_END | |
| 1191 | |
| 1192 | |
| 1692 | 1193 #if defined(COMPILER2) || defined(SHARK) |
| 0 | 1194 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS) { |
| 1195 // in case of an unresolved klass entry, load the class. | |
| 1196 if (constant_pool->tag_at(index).is_unresolved_klass()) { | |
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1197 Klass* tk = constant_pool->klass_at(index, CHECK); |
| 0 | 1198 return; |
| 1199 } | |
| 1200 | |
| 1201 if (!constant_pool->tag_at(index).is_symbol()) return; | |
| 1202 | |
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1203 Handle class_loader (THREAD, constant_pool->pool_holder()->class_loader()); |
|
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1204 Symbol* symbol = constant_pool->symbol_at(index); |
| 0 | 1205 |
| 1206 // class name? | |
| 1207 if (symbol->byte_at(0) != '(') { | |
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1208 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
| 0 | 1209 SystemDictionary::resolve_or_null(symbol, class_loader, protection_domain, CHECK); |
| 1210 return; | |
| 1211 } | |
| 1212 | |
| 1213 // then it must be a signature! | |
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1214 ResourceMark rm(THREAD); |
| 0 | 1215 for (SignatureStream ss(symbol); !ss.is_done(); ss.next()) { |
| 1216 if (ss.is_object()) { | |
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1217 Symbol* class_name = ss.as_symbol(CHECK); |
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1218 Handle protection_domain (THREAD, constant_pool->pool_holder()->protection_domain()); |
| 0 | 1219 SystemDictionary::resolve_or_null(class_name, class_loader, protection_domain, CHECK); |
| 1220 } | |
| 1221 } | |
| 1222 } | |
| 1223 | |
| 1224 | |
| 1225 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) { | |
| 1226 EXCEPTION_MARK; | |
| 1227 load_class_by_index(constant_pool, index, THREAD); | |
| 1228 if (HAS_PENDING_EXCEPTION) { | |
| 1229 // Exception happened during classloading. We ignore the exception here, since it | |
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1230 // is going to be rethrown since the current activation is going to be deoptimized and |
| 0 | 1231 // the interpreter will re-execute the bytecode. |
| 1232 CLEAR_PENDING_EXCEPTION; | |
|
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1233 // Class loading called java code which may have caused a stack |
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1234 // overflow. If the exception was thrown right before the return |
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1235 // to the runtime the stack is no longer guarded. Reguard the |
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1236 // stack otherwise if we return to the uncommon trap blob and the |
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1237 // stack bang causes a stack overflow we crash. |
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1238 assert(THREAD->is_Java_thread(), "only a java thread can be here"); |
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1239 JavaThread* thread = (JavaThread*)THREAD; |
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1240 bool guard_pages_enabled = thread->stack_yellow_zone_enabled(); |
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1241 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); |
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1242 assert(guard_pages_enabled, "stack banging in uncommon trap blob may cause crash"); |
| 0 | 1243 } |
| 1244 } | |
| 1245 | |
| 1246 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) { | |
| 1247 HandleMark hm; | |
| 1248 | |
| 1249 // uncommon_trap() is called at the beginning of the uncommon trap | |
| 1250 // handler. Note this fact before we start generating temporary frames | |
| 1251 // that can confuse an asynchronous stack walker. This counter is | |
| 1252 // decremented at the end of unpack_frames(). | |
| 1253 thread->inc_in_deopt_handler(); | |
| 1254 | |
| 1255 // We need to update the map if we have biased locking. | |
| 1256 RegisterMap reg_map(thread, UseBiasedLocking); | |
| 1257 frame stub_frame = thread->last_frame(); | |
| 1258 frame fr = stub_frame.sender(®_map); | |
| 1259 // Make sure the calling nmethod is not getting deoptimized and removed | |
| 1260 // before we are done with it. | |
| 1261 nmethodLocker nl(fr.pc()); | |
| 1262 | |
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1263 // Log a message |
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1264 Events::log(thread, "Uncommon trap: trap_request=" PTR32_FORMAT " fr.pc=" INTPTR_FORMAT, |
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1265 trap_request, fr.pc()); |
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1266 |
| 0 | 1267 { |
| 1268 ResourceMark rm; | |
| 1269 | |
| 1270 // Revoke biases of any monitors in the frame to ensure we can migrate them | |
| 1271 revoke_biases_of_monitors(thread, fr, ®_map); | |
| 1272 | |
| 1273 DeoptReason reason = trap_request_reason(trap_request); | |
| 1274 DeoptAction action = trap_request_action(trap_request); | |
| 1275 jint unloaded_class_index = trap_request_index(trap_request); // CP idx or -1 | |
| 1276 | |
| 1277 vframe* vf = vframe::new_vframe(&fr, ®_map, thread); | |
| 1278 compiledVFrame* cvf = compiledVFrame::cast(vf); | |
| 1279 | |
| 1280 nmethod* nm = cvf->code(); | |
| 1281 | |
| 1282 ScopeDesc* trap_scope = cvf->scope(); | |
| 1283 methodHandle trap_method = trap_scope->method(); | |
| 1284 int trap_bci = trap_scope->bci(); | |
| 2142 | 1285 Bytecodes::Code trap_bc = trap_method->java_code_at(trap_bci); |
| 0 | 1286 |
| 1287 // Record this event in the histogram. | |
| 1288 gather_statistics(reason, action, trap_bc); | |
| 1289 | |
| 1290 // Ensure that we can record deopt. history: | |
| 1291 bool create_if_missing = ProfileTraps; | |
| 1292 | |
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1293 MethodData* trap_mdo = |
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1294 get_method_data(thread, trap_method, create_if_missing); |
| 0 | 1295 |
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1296 // Log a message |
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1297 Events::log_deopt_message(thread, "Uncommon trap: reason=%s action=%s pc=" INTPTR_FORMAT " method=%s @ %d", |
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1298 trap_reason_name(reason), trap_action_name(action), fr.pc(), |
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1299 trap_method->name_and_sig_as_C_string(), trap_bci); |
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1300 |
| 0 | 1301 // Print a bunch of diagnostics, if requested. |
| 1302 if (TraceDeoptimization || LogCompilation) { | |
| 1303 ResourceMark rm; | |
| 1304 ttyLocker ttyl; | |
| 1305 char buf[100]; | |
| 1306 if (xtty != NULL) { | |
| 1307 xtty->begin_head("uncommon_trap thread='" UINTX_FORMAT"' %s", | |
| 1308 os::current_thread_id(), | |
| 1309 format_trap_request(buf, sizeof(buf), trap_request)); | |
| 1310 nm->log_identity(xtty); | |
| 1311 } | |
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1312 Symbol* class_name = NULL; |
| 0 | 1313 bool unresolved = false; |
| 1314 if (unloaded_class_index >= 0) { | |
| 1315 constantPoolHandle constants (THREAD, trap_method->constants()); | |
| 1316 if (constants->tag_at(unloaded_class_index).is_unresolved_klass()) { | |
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1317 class_name = constants->klass_name_at(unloaded_class_index); |
| 0 | 1318 unresolved = true; |
| 1319 if (xtty != NULL) | |
| 1320 xtty->print(" unresolved='1'"); | |
| 1321 } else if (constants->tag_at(unloaded_class_index).is_symbol()) { | |
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1322 class_name = constants->symbol_at(unloaded_class_index); |
| 0 | 1323 } |
| 1324 if (xtty != NULL) | |
| 1325 xtty->name(class_name); | |
| 1326 } | |
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1327 if (xtty != NULL && trap_mdo != NULL) { |
| 0 | 1328 // Dump the relevant MDO state. |
| 1329 // This is the deopt count for the current reason, any previous | |
| 1330 // reasons or recompiles seen at this point. | |
| 1331 int dcnt = trap_mdo->trap_count(reason); | |
| 1332 if (dcnt != 0) | |
| 1333 xtty->print(" count='%d'", dcnt); | |
| 1334 ProfileData* pdata = trap_mdo->bci_to_data(trap_bci); | |
| 1335 int dos = (pdata == NULL)? 0: pdata->trap_state(); | |
| 1336 if (dos != 0) { | |
| 1337 xtty->print(" state='%s'", format_trap_state(buf, sizeof(buf), dos)); | |
| 1338 if (trap_state_is_recompiled(dos)) { | |
| 1339 int recnt2 = trap_mdo->overflow_recompile_count(); | |
| 1340 if (recnt2 != 0) | |
| 1341 xtty->print(" recompiles2='%d'", recnt2); | |
| 1342 } | |
| 1343 } | |
| 1344 } | |
| 1345 if (xtty != NULL) { | |
| 1346 xtty->stamp(); | |
| 1347 xtty->end_head(); | |
| 1348 } | |
| 1349 if (TraceDeoptimization) { // make noise on the tty | |
| 1350 tty->print("Uncommon trap occurred in"); | |
| 1351 nm->method()->print_short_name(tty); | |
| 6843 | 1352 tty->print(" (@" INTPTR_FORMAT ") thread=" UINTX_FORMAT " reason=%s action=%s unloaded_class_index=%d", |
| 0 | 1353 fr.pc(), |
| 6843 | 1354 os::current_thread_id(), |
| 0 | 1355 trap_reason_name(reason), |
| 1356 trap_action_name(action), | |
| 1357 unloaded_class_index); | |
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1358 if (class_name != NULL) { |
| 0 | 1359 tty->print(unresolved ? " unresolved class: " : " symbol: "); |
| 1360 class_name->print_symbol_on(tty); | |
| 1361 } | |
| 1362 tty->cr(); | |
| 1363 } | |
| 1364 if (xtty != NULL) { | |
| 1365 // Log the precise location of the trap. | |
| 1366 for (ScopeDesc* sd = trap_scope; ; sd = sd->sender()) { | |
| 1367 xtty->begin_elem("jvms bci='%d'", sd->bci()); | |
| 1368 xtty->method(sd->method()); | |
| 1369 xtty->end_elem(); | |
| 1370 if (sd->is_top()) break; | |
| 1371 } | |
| 1372 xtty->tail("uncommon_trap"); | |
| 1373 } | |
| 1374 } | |
| 1375 // (End diagnostic printout.) | |
| 1376 | |
| 1377 // Load class if necessary | |
| 1378 if (unloaded_class_index >= 0) { | |
| 1379 constantPoolHandle constants(THREAD, trap_method->constants()); | |
| 1380 load_class_by_index(constants, unloaded_class_index); | |
| 1381 } | |
| 1382 | |
| 1383 // Flush the nmethod if necessary and desirable. | |
| 1384 // | |
| 1385 // We need to avoid situations where we are re-flushing the nmethod | |
| 1386 // because of a hot deoptimization site. Repeated flushes at the same | |
| 1387 // point need to be detected by the compiler and avoided. If the compiler | |
| 1388 // cannot avoid them (or has a bug and "refuses" to avoid them), this | |
| 1389 // module must take measures to avoid an infinite cycle of recompilation | |
| 1390 // and deoptimization. There are several such measures: | |
| 1391 // | |
| 1392 // 1. If a recompilation is ordered a second time at some site X | |
| 1393 // and for the same reason R, the action is adjusted to 'reinterpret', | |
| 1394 // to give the interpreter time to exercise the method more thoroughly. | |
| 1395 // If this happens, the method's overflow_recompile_count is incremented. | |
| 1396 // | |
| 1397 // 2. If the compiler fails to reduce the deoptimization rate, then | |
| 1398 // the method's overflow_recompile_count will begin to exceed the set | |
| 1399 // limit PerBytecodeRecompilationCutoff. If this happens, the action | |
| 1400 // is adjusted to 'make_not_compilable', and the method is abandoned | |
| 1401 // to the interpreter. This is a performance hit for hot methods, | |
| 1402 // but is better than a disastrous infinite cycle of recompilations. | |
| 1403 // (Actually, only the method containing the site X is abandoned.) | |
| 1404 // | |
| 1405 // 3. In parallel with the previous measures, if the total number of | |
| 1406 // recompilations of a method exceeds the much larger set limit | |
| 1407 // PerMethodRecompilationCutoff, the method is abandoned. | |
| 1408 // This should only happen if the method is very large and has | |
| 1409 // many "lukewarm" deoptimizations. The code which enforces this | |
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1410 // limit is elsewhere (class nmethod, class Method). |
| 0 | 1411 // |
| 1412 // Note that the per-BCI 'is_recompiled' bit gives the compiler one chance | |
| 1413 // to recompile at each bytecode independently of the per-BCI cutoff. | |
| 1414 // | |
| 1415 // The decision to update code is up to the compiler, and is encoded | |
| 1416 // in the Action_xxx code. If the compiler requests Action_none | |
| 1417 // no trap state is changed, no compiled code is changed, and the | |
| 1418 // computation suffers along in the interpreter. | |
| 1419 // | |
| 1420 // The other action codes specify various tactics for decompilation | |
| 1421 // and recompilation. Action_maybe_recompile is the loosest, and | |
| 1422 // allows the compiled code to stay around until enough traps are seen, | |
| 1423 // and until the compiler gets around to recompiling the trapping method. | |
| 1424 // | |
| 1425 // The other actions cause immediate removal of the present code. | |
| 1426 | |
| 1427 bool update_trap_state = true; | |
| 1428 bool make_not_entrant = false; | |
| 1429 bool make_not_compilable = false; | |
| 1783 | 1430 bool reprofile = false; |
| 0 | 1431 switch (action) { |
| 1432 case Action_none: | |
| 1433 // Keep the old code. | |
| 1434 update_trap_state = false; | |
| 1435 break; | |
| 1436 case Action_maybe_recompile: | |
| 1437 // Do not need to invalidate the present code, but we can | |
| 1438 // initiate another | |
| 1439 // Start compiler without (necessarily) invalidating the nmethod. | |
| 1440 // The system will tolerate the old code, but new code should be | |
| 1441 // generated when possible. | |
| 1442 break; | |
| 1443 case Action_reinterpret: | |
| 1444 // Go back into the interpreter for a while, and then consider | |
| 1445 // recompiling form scratch. | |
| 1446 make_not_entrant = true; | |
| 1447 // Reset invocation counter for outer most method. | |
| 1448 // This will allow the interpreter to exercise the bytecodes | |
| 1449 // for a while before recompiling. | |
| 1450 // By contrast, Action_make_not_entrant is immediate. | |
| 1451 // | |
| 1452 // Note that the compiler will track null_check, null_assert, | |
| 1453 // range_check, and class_check events and log them as if they | |
| 1454 // had been traps taken from compiled code. This will update | |
| 1455 // the MDO trap history so that the next compilation will | |
| 1456 // properly detect hot trap sites. | |
| 1783 | 1457 reprofile = true; |
| 0 | 1458 break; |
| 1459 case Action_make_not_entrant: | |
| 1460 // Request immediate recompilation, and get rid of the old code. | |
| 1461 // Make them not entrant, so next time they are called they get | |
| 1462 // recompiled. Unloaded classes are loaded now so recompile before next | |
| 1463 // time they are called. Same for uninitialized. The interpreter will | |
| 1464 // link the missing class, if any. | |
| 1465 make_not_entrant = true; | |
| 1466 break; | |
| 1467 case Action_make_not_compilable: | |
| 1468 // Give up on compiling this method at all. | |
| 1469 make_not_entrant = true; | |
| 1470 make_not_compilable = true; | |
| 1471 break; | |
| 1472 default: | |
| 1473 ShouldNotReachHere(); | |
| 1474 } | |
| 1475 | |
| 1476 // Setting +ProfileTraps fixes the following, on all platforms: | |
| 1477 // 4852688: ProfileInterpreter is off by default for ia64. The result is | |
| 1478 // infinite heroic-opt-uncommon-trap/deopt/recompile cycles, since the | |
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1479 // recompile relies on a MethodData* to record heroic opt failures. |
| 0 | 1480 |
| 1481 // Whether the interpreter is producing MDO data or not, we also need | |
| 1482 // to use the MDO to detect hot deoptimization points and control | |
| 1483 // aggressive optimization. | |
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1484 bool inc_recompile_count = false; |
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1485 ProfileData* pdata = NULL; |
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1486 if (ProfileTraps && update_trap_state && trap_mdo != NULL) { |
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1487 assert(trap_mdo == get_method_data(thread, trap_method, false), "sanity"); |
| 0 | 1488 uint this_trap_count = 0; |
| 1489 bool maybe_prior_trap = false; | |
| 1490 bool maybe_prior_recompile = false; | |
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1491 pdata = query_update_method_data(trap_mdo, trap_bci, reason, |
| 0 | 1492 //outputs: |
| 1493 this_trap_count, | |
| 1494 maybe_prior_trap, | |
| 1495 maybe_prior_recompile); | |
| 1496 // Because the interpreter also counts null, div0, range, and class | |
| 1497 // checks, these traps from compiled code are double-counted. | |
| 1498 // This is harmless; it just means that the PerXTrapLimit values | |
| 1499 // are in effect a little smaller than they look. | |
| 1500 | |
| 1501 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
| 1502 if (per_bc_reason != Reason_none) { | |
| 1503 // Now take action based on the partially known per-BCI history. | |
| 1504 if (maybe_prior_trap | |
| 1505 && this_trap_count >= (uint)PerBytecodeTrapLimit) { | |
| 1506 // If there are too many traps at this BCI, force a recompile. | |
| 1507 // This will allow the compiler to see the limit overflow, and | |
| 1508 // take corrective action, if possible. The compiler generally | |
| 1509 // does not use the exact PerBytecodeTrapLimit value, but instead | |
| 1510 // changes its tactics if it sees any traps at all. This provides | |
| 1511 // a little hysteresis, delaying a recompile until a trap happens | |
| 1512 // several times. | |
| 1513 // | |
| 1514 // Actually, since there is only one bit of counter per BCI, | |
| 1515 // the possible per-BCI counts are {0,1,(per-method count)}. | |
| 1516 // This produces accurate results if in fact there is only | |
| 1517 // one hot trap site, but begins to get fuzzy if there are | |
| 1518 // many sites. For example, if there are ten sites each | |
| 1519 // trapping two or more times, they each get the blame for | |
| 1520 // all of their traps. | |
| 1521 make_not_entrant = true; | |
| 1522 } | |
| 1523 | |
| 1524 // Detect repeated recompilation at the same BCI, and enforce a limit. | |
| 1525 if (make_not_entrant && maybe_prior_recompile) { | |
| 1526 // More than one recompile at this point. | |
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1527 inc_recompile_count = maybe_prior_trap; |
| 0 | 1528 } |
| 1529 } else { | |
| 1530 // For reasons which are not recorded per-bytecode, we simply | |
| 1531 // force recompiles unconditionally. | |
| 1532 // (Note that PerMethodRecompilationCutoff is enforced elsewhere.) | |
| 1533 make_not_entrant = true; | |
| 1534 } | |
| 1535 | |
| 1536 // Go back to the compiler if there are too many traps in this method. | |
| 1537 if (this_trap_count >= (uint)PerMethodTrapLimit) { | |
| 1538 // If there are too many traps in this method, force a recompile. | |
| 1539 // This will allow the compiler to see the limit overflow, and | |
| 1540 // take corrective action, if possible. | |
| 1541 // (This condition is an unlikely backstop only, because the | |
| 1542 // PerBytecodeTrapLimit is more likely to take effect first, | |
| 1543 // if it is applicable.) | |
| 1544 make_not_entrant = true; | |
| 1545 } | |
| 1546 | |
| 1547 // Here's more hysteresis: If there has been a recompile at | |
| 1548 // this trap point already, run the method in the interpreter | |
| 1549 // for a while to exercise it more thoroughly. | |
| 1550 if (make_not_entrant && maybe_prior_recompile && maybe_prior_trap) { | |
| 1783 | 1551 reprofile = true; |
| 0 | 1552 } |
| 1553 | |
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1554 } |
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1555 |
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1556 // Take requested actions on the method: |
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1557 |
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1558 // Recompile |
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1559 if (make_not_entrant) { |
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1560 if (!nm->make_not_entrant()) { |
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1561 return; // the call did not change nmethod's state |
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1562 } |
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1563 |
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1564 if (pdata != NULL) { |
| 0 | 1565 // Record the recompilation event, if any. |
| 1566 int tstate0 = pdata->trap_state(); | |
| 1567 int tstate1 = trap_state_set_recompiled(tstate0, true); | |
| 1568 if (tstate1 != tstate0) | |
| 1569 pdata->set_trap_state(tstate1); | |
| 1570 } | |
| 1571 } | |
| 1572 | |
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1573 if (inc_recompile_count) { |
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1574 trap_mdo->inc_overflow_recompile_count(); |
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1575 if ((uint)trap_mdo->overflow_recompile_count() > |
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1576 (uint)PerBytecodeRecompilationCutoff) { |
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1577 // Give up on the method containing the bad BCI. |
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1578 if (trap_method() == nm->method()) { |
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1579 make_not_compilable = true; |
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1580 } else { |
| 7998 | 1581 trap_method->set_not_compilable(CompLevel_full_optimization, true, "overflow_recompile_count > PerBytecodeRecompilationCutoff"); |
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1582 // But give grace to the enclosing nm->method(). |
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1583 } |
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1584 } |
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1585 } |
| 0 | 1586 |
| 1783 | 1587 // Reprofile |
| 1588 if (reprofile) { | |
| 1589 CompilationPolicy::policy()->reprofile(trap_scope, nm->is_osr_method()); | |
| 0 | 1590 } |
| 1591 | |
| 1592 // Give up compiling | |
| 1783 | 1593 if (make_not_compilable && !nm->method()->is_not_compilable(CompLevel_full_optimization)) { |
| 0 | 1594 assert(make_not_entrant, "consistent"); |
| 1783 | 1595 nm->method()->set_not_compilable(CompLevel_full_optimization); |
| 0 | 1596 } |
| 1597 | |
| 1598 } // Free marked resources | |
| 1599 | |
| 1600 } | |
| 1601 JRT_END | |
| 1602 | |
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1603 MethodData* |
| 0 | 1604 Deoptimization::get_method_data(JavaThread* thread, methodHandle m, |
| 1605 bool create_if_missing) { | |
| 1606 Thread* THREAD = thread; | |
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1607 MethodData* mdo = m()->method_data(); |
| 0 | 1608 if (mdo == NULL && create_if_missing && !HAS_PENDING_EXCEPTION) { |
| 1609 // Build an MDO. Ignore errors like OutOfMemory; | |
| 1610 // that simply means we won't have an MDO to update. | |
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1611 Method::build_interpreter_method_data(m, THREAD); |
| 0 | 1612 if (HAS_PENDING_EXCEPTION) { |
| 1613 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); | |
| 1614 CLEAR_PENDING_EXCEPTION; | |
| 1615 } | |
| 1616 mdo = m()->method_data(); | |
| 1617 } | |
| 1618 return mdo; | |
| 1619 } | |
| 1620 | |
| 1621 ProfileData* | |
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1622 Deoptimization::query_update_method_data(MethodData* trap_mdo, |
| 0 | 1623 int trap_bci, |
| 1624 Deoptimization::DeoptReason reason, | |
| 1625 //outputs: | |
| 1626 uint& ret_this_trap_count, | |
| 1627 bool& ret_maybe_prior_trap, | |
| 1628 bool& ret_maybe_prior_recompile) { | |
| 1629 uint prior_trap_count = trap_mdo->trap_count(reason); | |
| 1630 uint this_trap_count = trap_mdo->inc_trap_count(reason); | |
| 1631 | |
| 1632 // If the runtime cannot find a place to store trap history, | |
| 1633 // it is estimated based on the general condition of the method. | |
| 1634 // If the method has ever been recompiled, or has ever incurred | |
| 1635 // a trap with the present reason , then this BCI is assumed | |
| 1636 // (pessimistically) to be the culprit. | |
| 1637 bool maybe_prior_trap = (prior_trap_count != 0); | |
| 1638 bool maybe_prior_recompile = (trap_mdo->decompile_count() != 0); | |
| 1639 ProfileData* pdata = NULL; | |
| 1640 | |
| 1641 | |
| 1642 // For reasons which are recorded per bytecode, we check per-BCI data. | |
| 1643 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); | |
| 1644 if (per_bc_reason != Reason_none) { | |
| 1645 // Find the profile data for this BCI. If there isn't one, | |
| 1646 // try to allocate one from the MDO's set of spares. | |
| 1647 // This will let us detect a repeated trap at this point. | |
| 1648 pdata = trap_mdo->allocate_bci_to_data(trap_bci); | |
| 1649 | |
| 1650 if (pdata != NULL) { | |
| 1651 // Query the trap state of this profile datum. | |
| 1652 int tstate0 = pdata->trap_state(); | |
| 1653 if (!trap_state_has_reason(tstate0, per_bc_reason)) | |
| 1654 maybe_prior_trap = false; | |
| 1655 if (!trap_state_is_recompiled(tstate0)) | |
| 1656 maybe_prior_recompile = false; | |
| 1657 | |
| 1658 // Update the trap state of this profile datum. | |
| 1659 int tstate1 = tstate0; | |
| 1660 // Record the reason. | |
| 1661 tstate1 = trap_state_add_reason(tstate1, per_bc_reason); | |
| 1662 // Store the updated state on the MDO, for next time. | |
| 1663 if (tstate1 != tstate0) | |
| 1664 pdata->set_trap_state(tstate1); | |
| 1665 } else { | |
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1666 if (LogCompilation && xtty != NULL) { |
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1667 ttyLocker ttyl; |
| 0 | 1668 // Missing MDP? Leave a small complaint in the log. |
| 1669 xtty->elem("missing_mdp bci='%d'", trap_bci); | |
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1670 } |
| 0 | 1671 } |
| 1672 } | |
| 1673 | |
| 1674 // Return results: | |
| 1675 ret_this_trap_count = this_trap_count; | |
| 1676 ret_maybe_prior_trap = maybe_prior_trap; | |
| 1677 ret_maybe_prior_recompile = maybe_prior_recompile; | |
| 1678 return pdata; | |
| 1679 } | |
| 1680 | |
| 1681 void | |
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1682 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
| 0 | 1683 ResourceMark rm; |
| 1684 // Ignored outputs: | |
| 1685 uint ignore_this_trap_count; | |
| 1686 bool ignore_maybe_prior_trap; | |
| 1687 bool ignore_maybe_prior_recompile; | |
| 1688 query_update_method_data(trap_mdo, trap_bci, | |
| 1689 (DeoptReason)reason, | |
| 1690 ignore_this_trap_count, | |
| 1691 ignore_maybe_prior_trap, | |
| 1692 ignore_maybe_prior_recompile); | |
| 1693 } | |
| 1694 | |
| 1695 Deoptimization::UnrollBlock* Deoptimization::uncommon_trap(JavaThread* thread, jint trap_request) { | |
| 1696 | |
| 1697 // Still in Java no safepoints | |
| 1698 { | |
| 1699 // This enters VM and may safepoint | |
| 1700 uncommon_trap_inner(thread, trap_request); | |
| 1701 } | |
| 1702 return fetch_unroll_info_helper(thread); | |
| 1703 } | |
| 1704 | |
| 1705 // Local derived constants. | |
| 1706 // Further breakdown of DataLayout::trap_state, as promised by DataLayout. | |
| 1707 const int DS_REASON_MASK = DataLayout::trap_mask >> 1; | |
| 1708 const int DS_RECOMPILE_BIT = DataLayout::trap_mask - DS_REASON_MASK; | |
| 1709 | |
| 1710 //---------------------------trap_state_reason--------------------------------- | |
| 1711 Deoptimization::DeoptReason | |
| 1712 Deoptimization::trap_state_reason(int trap_state) { | |
| 1713 // This assert provides the link between the width of DataLayout::trap_bits | |
| 1714 // and the encoding of "recorded" reasons. It ensures there are enough | |
| 1715 // bits to store all needed reasons in the per-BCI MDO profile. | |
| 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 Reason_many; | |
| 1721 } else { | |
| 1722 assert((int)Reason_none == 0, "state=0 => Reason_none"); | |
| 1723 return (DeoptReason)trap_state; | |
| 1724 } | |
| 1725 } | |
| 1726 //-------------------------trap_state_has_reason------------------------------- | |
| 1727 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
| 1728 assert(reason_is_recorded_per_bytecode((DeoptReason)reason), "valid reason"); | |
| 1729 assert(DS_REASON_MASK >= Reason_RECORDED_LIMIT, "enough bits"); | |
| 1730 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
| 1731 trap_state -= recompile_bit; | |
| 1732 if (trap_state == DS_REASON_MASK) { | |
| 1733 return -1; // true, unspecifically (bottom of state lattice) | |
| 1734 } else if (trap_state == reason) { | |
| 1735 return 1; // true, definitely | |
| 1736 } else if (trap_state == 0) { | |
| 1737 return 0; // false, definitely (top of state lattice) | |
| 1738 } else { | |
| 1739 return 0; // false, definitely | |
| 1740 } | |
| 1741 } | |
| 1742 //-------------------------trap_state_add_reason------------------------------- | |
| 1743 int Deoptimization::trap_state_add_reason(int trap_state, int reason) { | |
| 1744 assert(reason_is_recorded_per_bytecode((DeoptReason)reason) || reason == Reason_many, "valid reason"); | |
| 1745 int recompile_bit = (trap_state & DS_RECOMPILE_BIT); | |
| 1746 trap_state -= recompile_bit; | |
| 1747 if (trap_state == DS_REASON_MASK) { | |
| 1748 return trap_state + recompile_bit; // already at state lattice bottom | |
| 1749 } else if (trap_state == reason) { | |
| 1750 return trap_state + recompile_bit; // the condition is already true | |
| 1751 } else if (trap_state == 0) { | |
| 1752 return reason + recompile_bit; // no condition has yet been true | |
| 1753 } else { | |
| 1754 return DS_REASON_MASK + recompile_bit; // fall to state lattice bottom | |
| 1755 } | |
| 1756 } | |
| 1757 //-----------------------trap_state_is_recompiled------------------------------ | |
| 1758 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
| 1759 return (trap_state & DS_RECOMPILE_BIT) != 0; | |
| 1760 } | |
| 1761 //-----------------------trap_state_set_recompiled----------------------------- | |
| 1762 int Deoptimization::trap_state_set_recompiled(int trap_state, bool z) { | |
| 1763 if (z) return trap_state | DS_RECOMPILE_BIT; | |
| 1764 else return trap_state & ~DS_RECOMPILE_BIT; | |
| 1765 } | |
| 1766 //---------------------------format_trap_state--------------------------------- | |
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1767 // This is used for debugging and diagnostics, including LogFile output. |
| 0 | 1768 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, |
| 1769 int trap_state) { | |
| 1770 DeoptReason reason = trap_state_reason(trap_state); | |
| 1771 bool recomp_flag = trap_state_is_recompiled(trap_state); | |
| 1772 // Re-encode the state from its decoded components. | |
| 1773 int decoded_state = 0; | |
| 1774 if (reason_is_recorded_per_bytecode(reason) || reason == Reason_many) | |
| 1775 decoded_state = trap_state_add_reason(decoded_state, reason); | |
| 1776 if (recomp_flag) | |
| 1777 decoded_state = trap_state_set_recompiled(decoded_state, recomp_flag); | |
| 1778 // If the state re-encodes properly, format it symbolically. | |
| 1779 // Because this routine is used for debugging and diagnostics, | |
| 1780 // be robust even if the state is a strange value. | |
| 1781 size_t len; | |
| 1782 if (decoded_state != trap_state) { | |
| 1783 // Random buggy state that doesn't decode?? | |
| 1784 len = jio_snprintf(buf, buflen, "#%d", trap_state); | |
| 1785 } else { | |
| 1786 len = jio_snprintf(buf, buflen, "%s%s", | |
| 1787 trap_reason_name(reason), | |
| 1788 recomp_flag ? " recompiled" : ""); | |
| 1789 } | |
| 1790 if (len >= buflen) | |
| 1791 buf[buflen-1] = '\0'; | |
| 1792 return buf; | |
| 1793 } | |
| 1794 | |
| 1795 | |
| 1796 //--------------------------------statics-------------------------------------- | |
| 1797 Deoptimization::DeoptAction Deoptimization::_unloaded_action | |
| 1798 = Deoptimization::Action_reinterpret; | |
| 1799 const char* Deoptimization::_trap_reason_name[Reason_LIMIT] = { | |
| 1800 // Note: Keep this in sync. with enum DeoptReason. | |
| 1801 "none", | |
| 1802 "null_check", | |
| 1803 "null_assert", | |
| 1804 "range_check", | |
| 1805 "class_check", | |
| 1806 "array_check", | |
| 1807 "intrinsic", | |
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1808 "bimorphic", |
| 0 | 1809 "unloaded", |
| 1810 "uninitialized", | |
| 1811 "unreached", | |
| 1812 "unhandled", | |
| 1813 "constraint", | |
| 1814 "div0_check", | |
| 1172 | 1815 "age", |
| 3345 | 1816 "predicate", |
| 1817 "loop_limit_check" | |
| 0 | 1818 }; |
| 1819 const char* Deoptimization::_trap_action_name[Action_LIMIT] = { | |
| 1820 // Note: Keep this in sync. with enum DeoptAction. | |
| 1821 "none", | |
| 1822 "maybe_recompile", | |
| 1823 "reinterpret", | |
| 1824 "make_not_entrant", | |
| 1825 "make_not_compilable" | |
| 1826 }; | |
| 1827 | |
| 1828 const char* Deoptimization::trap_reason_name(int reason) { | |
| 1829 if (reason == Reason_many) return "many"; | |
| 1830 if ((uint)reason < Reason_LIMIT) | |
| 1831 return _trap_reason_name[reason]; | |
| 1832 static char buf[20]; | |
| 1833 sprintf(buf, "reason%d", reason); | |
| 1834 return buf; | |
| 1835 } | |
| 1836 const char* Deoptimization::trap_action_name(int action) { | |
| 1837 if ((uint)action < Action_LIMIT) | |
| 1838 return _trap_action_name[action]; | |
| 1839 static char buf[20]; | |
| 1840 sprintf(buf, "action%d", action); | |
| 1841 return buf; | |
| 1842 } | |
| 1843 | |
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1844 // This is used for debugging and diagnostics, including LogFile output. |
| 0 | 1845 const char* Deoptimization::format_trap_request(char* buf, size_t buflen, |
| 1846 int trap_request) { | |
| 1847 jint unloaded_class_index = trap_request_index(trap_request); | |
| 1848 const char* reason = trap_reason_name(trap_request_reason(trap_request)); | |
| 1849 const char* action = trap_action_name(trap_request_action(trap_request)); | |
| 1850 size_t len; | |
| 1851 if (unloaded_class_index < 0) { | |
| 1852 len = jio_snprintf(buf, buflen, "reason='%s' action='%s'", | |
| 1853 reason, action); | |
| 1854 } else { | |
| 1855 len = jio_snprintf(buf, buflen, "reason='%s' action='%s' index='%d'", | |
| 1856 reason, action, unloaded_class_index); | |
| 1857 } | |
| 1858 if (len >= buflen) | |
| 1859 buf[buflen-1] = '\0'; | |
| 1860 return buf; | |
| 1861 } | |
| 1862 | |
| 1863 juint Deoptimization::_deoptimization_hist | |
| 1864 [Deoptimization::Reason_LIMIT] | |
| 1865 [1 + Deoptimization::Action_LIMIT] | |
| 1866 [Deoptimization::BC_CASE_LIMIT] | |
| 1867 = {0}; | |
| 1868 | |
| 1869 enum { | |
| 1870 LSB_BITS = 8, | |
| 1871 LSB_MASK = right_n_bits(LSB_BITS) | |
| 1872 }; | |
| 1873 | |
| 1874 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
| 1875 Bytecodes::Code bc) { | |
| 1876 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
| 1877 assert(action >= 0 && action < Action_LIMIT, "oob"); | |
| 1878 _deoptimization_hist[Reason_none][0][0] += 1; // total | |
| 1879 _deoptimization_hist[reason][0][0] += 1; // per-reason total | |
| 1880 juint* cases = _deoptimization_hist[reason][1+action]; | |
| 1881 juint* bc_counter_addr = NULL; | |
| 1882 juint bc_counter = 0; | |
| 1883 // Look for an unused counter, or an exact match to this BC. | |
| 1884 if (bc != Bytecodes::_illegal) { | |
| 1885 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
| 1886 juint* counter_addr = &cases[bc_case]; | |
| 1887 juint counter = *counter_addr; | |
| 1888 if ((counter == 0 && bc_counter_addr == NULL) | |
| 1889 || (Bytecodes::Code)(counter & LSB_MASK) == bc) { | |
| 1890 // this counter is either free or is already devoted to this BC | |
| 1891 bc_counter_addr = counter_addr; | |
| 1892 bc_counter = counter | bc; | |
| 1893 } | |
| 1894 } | |
| 1895 } | |
| 1896 if (bc_counter_addr == NULL) { | |
| 1897 // Overflow, or no given bytecode. | |
| 1898 bc_counter_addr = &cases[BC_CASE_LIMIT-1]; | |
| 1899 bc_counter = (*bc_counter_addr & ~LSB_MASK); // clear LSB | |
| 1900 } | |
| 1901 *bc_counter_addr = bc_counter + (1 << LSB_BITS); | |
| 1902 } | |
| 1903 | |
| 1904 jint Deoptimization::total_deoptimization_count() { | |
| 1905 return _deoptimization_hist[Reason_none][0][0]; | |
| 1906 } | |
| 1907 | |
| 1908 jint Deoptimization::deoptimization_count(DeoptReason reason) { | |
| 1909 assert(reason >= 0 && reason < Reason_LIMIT, "oob"); | |
| 1910 return _deoptimization_hist[reason][0][0]; | |
| 1911 } | |
| 1912 | |
| 1913 void Deoptimization::print_statistics() { | |
| 1914 juint total = total_deoptimization_count(); | |
| 1915 juint account = total; | |
| 1916 if (total != 0) { | |
| 1917 ttyLocker ttyl; | |
| 1918 if (xtty != NULL) xtty->head("statistics type='deoptimization'"); | |
| 1919 tty->print_cr("Deoptimization traps recorded:"); | |
| 1920 #define PRINT_STAT_LINE(name, r) \ | |
| 1921 tty->print_cr(" %4d (%4.1f%%) %s", (int)(r), ((r) * 100.0) / total, name); | |
| 1922 PRINT_STAT_LINE("total", total); | |
| 1923 // For each non-zero entry in the histogram, print the reason, | |
| 1924 // the action, and (if specifically known) the type of bytecode. | |
| 1925 for (int reason = 0; reason < Reason_LIMIT; reason++) { | |
| 1926 for (int action = 0; action < Action_LIMIT; action++) { | |
| 1927 juint* cases = _deoptimization_hist[reason][1+action]; | |
| 1928 for (int bc_case = 0; bc_case < BC_CASE_LIMIT; bc_case++) { | |
| 1929 juint counter = cases[bc_case]; | |
| 1930 if (counter != 0) { | |
| 1931 char name[1*K]; | |
| 1932 Bytecodes::Code bc = (Bytecodes::Code)(counter & LSB_MASK); | |
| 1933 if (bc_case == BC_CASE_LIMIT && (int)bc == 0) | |
| 1934 bc = Bytecodes::_illegal; | |
| 1935 sprintf(name, "%s/%s/%s", | |
| 1936 trap_reason_name(reason), | |
| 1937 trap_action_name(action), | |
| 1938 Bytecodes::is_defined(bc)? Bytecodes::name(bc): "other"); | |
| 1939 juint r = counter >> LSB_BITS; | |
| 1940 tty->print_cr(" %40s: " UINT32_FORMAT " (%.1f%%)", name, r, (r * 100.0) / total); | |
| 1941 account -= r; | |
| 1942 } | |
| 1943 } | |
| 1944 } | |
| 1945 } | |
| 1946 if (account != 0) { | |
| 1947 PRINT_STAT_LINE("unaccounted", account); | |
| 1948 } | |
| 1949 #undef PRINT_STAT_LINE | |
| 1950 if (xtty != NULL) xtty->tail("statistics"); | |
| 1951 } | |
| 1952 } | |
| 1692 | 1953 #else // COMPILER2 || SHARK |
| 0 | 1954 |
| 1955 | |
| 1956 // Stubs for C1 only system. | |
| 1957 bool Deoptimization::trap_state_is_recompiled(int trap_state) { | |
| 1958 return false; | |
| 1959 } | |
| 1960 | |
| 1961 const char* Deoptimization::trap_reason_name(int reason) { | |
| 1962 return "unknown"; | |
| 1963 } | |
| 1964 | |
| 1965 void Deoptimization::print_statistics() { | |
| 1966 // no output | |
| 1967 } | |
| 1968 | |
| 1969 void | |
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1970 Deoptimization::update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason) { |
| 0 | 1971 // no udpate |
| 1972 } | |
| 1973 | |
| 1974 int Deoptimization::trap_state_has_reason(int trap_state, int reason) { | |
| 1975 return 0; | |
| 1976 } | |
| 1977 | |
| 1978 void Deoptimization::gather_statistics(DeoptReason reason, DeoptAction action, | |
| 1979 Bytecodes::Code bc) { | |
| 1980 // no update | |
| 1981 } | |
| 1982 | |
| 1983 const char* Deoptimization::format_trap_state(char* buf, size_t buflen, | |
| 1984 int trap_state) { | |
| 1985 jio_snprintf(buf, buflen, "#%d", trap_state); | |
| 1986 return buf; | |
| 1987 } | |
| 1988 | |
| 1692 | 1989 #endif // COMPILER2 || SHARK |