1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "aot/aotLoader.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "code/codeCache.hpp" 32 #include "code/compiledIC.hpp" 33 #include "code/icBuffer.hpp" 34 #include "code/compiledMethod.inline.hpp" 35 #include "code/scopeDesc.hpp" 36 #include "code/vtableStubs.hpp" 37 #include "compiler/abstractCompiler.hpp" 38 #include "compiler/compileBroker.hpp" 39 #include "compiler/disassembler.hpp" 40 #include "gc/shared/barrierSet.hpp" 41 #include "gc/shared/gcLocker.inline.hpp" 42 #include "interpreter/interpreter.hpp" 43 #include "interpreter/interpreterRuntime.hpp" 44 #include "jfr/jfrEvents.hpp" 45 #include "logging/log.hpp" 46 #include "memory/metaspaceShared.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/klass.hpp" 50 #include "oops/method.inline.hpp" 51 #include "oops/objArrayKlass.hpp" 52 #include "oops/oop.inline.hpp" 53 #include "prims/forte.hpp" 54 #include "prims/jvmtiExport.hpp" 55 #include "prims/methodHandles.hpp" 56 #include "prims/nativeLookup.hpp" 57 #include "runtime/arguments.hpp" 58 #include "runtime/atomic.hpp" 59 #include "runtime/biasedLocking.hpp" 60 #include "runtime/frame.inline.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/init.hpp" 63 #include "runtime/interfaceSupport.inline.hpp" 64 #include "runtime/java.hpp" 65 #include "runtime/javaCalls.hpp" 66 #include "runtime/objectMonitor.hpp" 67 #include "runtime/sharedRuntime.hpp" 68 #include "runtime/stubRoutines.hpp" 69 #include "runtime/synchronizer.hpp" 70 #include "runtime/vframe.inline.hpp" 71 #include "runtime/vframeArray.hpp" 72 #include "utilities/copy.hpp" 73 #include "utilities/dtrace.hpp" 74 #include "utilities/events.hpp" 75 #include "utilities/hashtable.inline.hpp" 76 #include "utilities/macros.hpp" 77 #include "utilities/xmlstream.hpp" 78 #ifdef COMPILER1 79 #include "c1/c1_Runtime1.hpp" 80 #endif 81 82 // Shared stub locations 83 RuntimeStub* SharedRuntime::_wrong_method_blob; 84 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob; 85 RuntimeStub* SharedRuntime::_ic_miss_blob; 86 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob; 87 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob; 88 RuntimeStub* SharedRuntime::_resolve_static_call_blob; 89 address SharedRuntime::_resolve_static_call_entry; 90 91 DeoptimizationBlob* SharedRuntime::_deopt_blob; 92 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob; 93 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob; 94 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob; 95 96 #ifdef COMPILER2 97 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob; 98 #endif // COMPILER2 99 100 101 //----------------------------generate_stubs----------------------------------- 102 void SharedRuntime::generate_stubs() { 103 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub"); 104 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub"); 105 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub"); 106 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call"); 107 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call"); 108 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call"); 109 _resolve_static_call_entry = _resolve_static_call_blob->entry_point(); 110 111 #if COMPILER2_OR_JVMCI 112 // Vectors are generated only by C2 and JVMCI. 113 bool support_wide = is_wide_vector(MaxVectorSize); 114 if (support_wide) { 115 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP); 116 } 117 #endif // COMPILER2_OR_JVMCI 118 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP); 119 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN); 120 121 generate_deopt_blob(); 122 123 #ifdef COMPILER2 124 generate_uncommon_trap_blob(); 125 #endif // COMPILER2 126 } 127 128 #include <math.h> 129 130 // Implementation of SharedRuntime 131 132 #ifndef PRODUCT 133 // For statistics 134 int SharedRuntime::_ic_miss_ctr = 0; 135 int SharedRuntime::_wrong_method_ctr = 0; 136 int SharedRuntime::_resolve_static_ctr = 0; 137 int SharedRuntime::_resolve_virtual_ctr = 0; 138 int SharedRuntime::_resolve_opt_virtual_ctr = 0; 139 int SharedRuntime::_implicit_null_throws = 0; 140 int SharedRuntime::_implicit_div0_throws = 0; 141 int SharedRuntime::_throw_null_ctr = 0; 142 143 int SharedRuntime::_nof_normal_calls = 0; 144 int SharedRuntime::_nof_optimized_calls = 0; 145 int SharedRuntime::_nof_inlined_calls = 0; 146 int SharedRuntime::_nof_megamorphic_calls = 0; 147 int SharedRuntime::_nof_static_calls = 0; 148 int SharedRuntime::_nof_inlined_static_calls = 0; 149 int SharedRuntime::_nof_interface_calls = 0; 150 int SharedRuntime::_nof_optimized_interface_calls = 0; 151 int SharedRuntime::_nof_inlined_interface_calls = 0; 152 int SharedRuntime::_nof_megamorphic_interface_calls = 0; 153 int SharedRuntime::_nof_removable_exceptions = 0; 154 155 int SharedRuntime::_new_instance_ctr=0; 156 int SharedRuntime::_new_array_ctr=0; 157 int SharedRuntime::_multi1_ctr=0; 158 int SharedRuntime::_multi2_ctr=0; 159 int SharedRuntime::_multi3_ctr=0; 160 int SharedRuntime::_multi4_ctr=0; 161 int SharedRuntime::_multi5_ctr=0; 162 int SharedRuntime::_mon_enter_stub_ctr=0; 163 int SharedRuntime::_mon_exit_stub_ctr=0; 164 int SharedRuntime::_mon_enter_ctr=0; 165 int SharedRuntime::_mon_exit_ctr=0; 166 int SharedRuntime::_partial_subtype_ctr=0; 167 int SharedRuntime::_jbyte_array_copy_ctr=0; 168 int SharedRuntime::_jshort_array_copy_ctr=0; 169 int SharedRuntime::_jint_array_copy_ctr=0; 170 int SharedRuntime::_jlong_array_copy_ctr=0; 171 int SharedRuntime::_oop_array_copy_ctr=0; 172 int SharedRuntime::_checkcast_array_copy_ctr=0; 173 int SharedRuntime::_unsafe_array_copy_ctr=0; 174 int SharedRuntime::_generic_array_copy_ctr=0; 175 int SharedRuntime::_slow_array_copy_ctr=0; 176 int SharedRuntime::_find_handler_ctr=0; 177 int SharedRuntime::_rethrow_ctr=0; 178 179 int SharedRuntime::_ICmiss_index = 0; 180 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count]; 181 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count]; 182 183 184 void SharedRuntime::trace_ic_miss(address at) { 185 for (int i = 0; i < _ICmiss_index; i++) { 186 if (_ICmiss_at[i] == at) { 187 _ICmiss_count[i]++; 188 return; 189 } 190 } 191 int index = _ICmiss_index++; 192 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1; 193 _ICmiss_at[index] = at; 194 _ICmiss_count[index] = 1; 195 } 196 197 void SharedRuntime::print_ic_miss_histogram() { 198 if (ICMissHistogram) { 199 tty->print_cr("IC Miss Histogram:"); 200 int tot_misses = 0; 201 for (int i = 0; i < _ICmiss_index; i++) { 202 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]); 203 tot_misses += _ICmiss_count[i]; 204 } 205 tty->print_cr("Total IC misses: %7d", tot_misses); 206 } 207 } 208 #endif // PRODUCT 209 210 211 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x)) 212 return x * y; 213 JRT_END 214 215 216 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x)) 217 if (x == min_jlong && y == CONST64(-1)) { 218 return x; 219 } else { 220 return x / y; 221 } 222 JRT_END 223 224 225 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x)) 226 if (x == min_jlong && y == CONST64(-1)) { 227 return 0; 228 } else { 229 return x % y; 230 } 231 JRT_END 232 233 234 const juint float_sign_mask = 0x7FFFFFFF; 235 const juint float_infinity = 0x7F800000; 236 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF); 237 const julong double_infinity = CONST64(0x7FF0000000000000); 238 239 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y)) 240 #ifdef _WIN64 241 // 64-bit Windows on amd64 returns the wrong values for 242 // infinity operands. 243 union { jfloat f; juint i; } xbits, ybits; 244 xbits.f = x; 245 ybits.f = y; 246 // x Mod Infinity == x unless x is infinity 247 if (((xbits.i & float_sign_mask) != float_infinity) && 248 ((ybits.i & float_sign_mask) == float_infinity) ) { 249 return x; 250 } 251 return ((jfloat)fmod_winx64((double)x, (double)y)); 252 #else 253 return ((jfloat)fmod((double)x,(double)y)); 254 #endif 255 JRT_END 256 257 258 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y)) 259 #ifdef _WIN64 260 union { jdouble d; julong l; } xbits, ybits; 261 xbits.d = x; 262 ybits.d = y; 263 // x Mod Infinity == x unless x is infinity 264 if (((xbits.l & double_sign_mask) != double_infinity) && 265 ((ybits.l & double_sign_mask) == double_infinity) ) { 266 return x; 267 } 268 return ((jdouble)fmod_winx64((double)x, (double)y)); 269 #else 270 return ((jdouble)fmod((double)x,(double)y)); 271 #endif 272 JRT_END 273 274 #ifdef __SOFTFP__ 275 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y)) 276 return x + y; 277 JRT_END 278 279 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y)) 280 return x - y; 281 JRT_END 282 283 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y)) 284 return x * y; 285 JRT_END 286 287 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y)) 288 return x / y; 289 JRT_END 290 291 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y)) 292 return x + y; 293 JRT_END 294 295 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y)) 296 return x - y; 297 JRT_END 298 299 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y)) 300 return x * y; 301 JRT_END 302 303 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y)) 304 return x / y; 305 JRT_END 306 307 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x)) 308 return (jfloat)x; 309 JRT_END 310 311 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x)) 312 return (jdouble)x; 313 JRT_END 314 315 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x)) 316 return (jdouble)x; 317 JRT_END 318 319 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y)) 320 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/ 321 JRT_END 322 323 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y)) 324 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 325 JRT_END 326 327 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y)) 328 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */ 329 JRT_END 330 331 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y)) 332 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 333 JRT_END 334 335 // Functions to return the opposite of the aeabi functions for nan. 336 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y)) 337 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 338 JRT_END 339 340 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y)) 341 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 342 JRT_END 343 344 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y)) 345 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 346 JRT_END 347 348 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y)) 349 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 350 JRT_END 351 352 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y)) 353 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 354 JRT_END 355 356 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y)) 357 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 358 JRT_END 359 360 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y)) 361 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 362 JRT_END 363 364 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y)) 365 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 366 JRT_END 367 368 // Intrinsics make gcc generate code for these. 369 float SharedRuntime::fneg(float f) { 370 return -f; 371 } 372 373 double SharedRuntime::dneg(double f) { 374 return -f; 375 } 376 377 #endif // __SOFTFP__ 378 379 #if defined(__SOFTFP__) || defined(E500V2) 380 // Intrinsics make gcc generate code for these. 381 double SharedRuntime::dabs(double f) { 382 return (f <= (double)0.0) ? (double)0.0 - f : f; 383 } 384 385 #endif 386 387 #if defined(__SOFTFP__) || defined(PPC) 388 double SharedRuntime::dsqrt(double f) { 389 return sqrt(f); 390 } 391 #endif 392 393 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x)) 394 if (g_isnan(x)) 395 return 0; 396 if (x >= (jfloat) max_jint) 397 return max_jint; 398 if (x <= (jfloat) min_jint) 399 return min_jint; 400 return (jint) x; 401 JRT_END 402 403 404 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x)) 405 if (g_isnan(x)) 406 return 0; 407 if (x >= (jfloat) max_jlong) 408 return max_jlong; 409 if (x <= (jfloat) min_jlong) 410 return min_jlong; 411 return (jlong) x; 412 JRT_END 413 414 415 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x)) 416 if (g_isnan(x)) 417 return 0; 418 if (x >= (jdouble) max_jint) 419 return max_jint; 420 if (x <= (jdouble) min_jint) 421 return min_jint; 422 return (jint) x; 423 JRT_END 424 425 426 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x)) 427 if (g_isnan(x)) 428 return 0; 429 if (x >= (jdouble) max_jlong) 430 return max_jlong; 431 if (x <= (jdouble) min_jlong) 432 return min_jlong; 433 return (jlong) x; 434 JRT_END 435 436 437 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x)) 438 return (jfloat)x; 439 JRT_END 440 441 442 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x)) 443 return (jfloat)x; 444 JRT_END 445 446 447 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x)) 448 return (jdouble)x; 449 JRT_END 450 451 // Exception handling across interpreter/compiler boundaries 452 // 453 // exception_handler_for_return_address(...) returns the continuation address. 454 // The continuation address is the entry point of the exception handler of the 455 // previous frame depending on the return address. 456 457 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) { 458 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address)); 459 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?"); 460 461 // Reset method handle flag. 462 thread->set_is_method_handle_return(false); 463 464 #if INCLUDE_JVMCI 465 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear 466 // and other exception handler continuations do not read it 467 thread->set_exception_pc(NULL); 468 #endif // INCLUDE_JVMCI 469 470 // The fastest case first 471 CodeBlob* blob = CodeCache::find_blob(return_address); 472 CompiledMethod* nm = (blob != NULL) ? blob->as_compiled_method_or_null() : NULL; 473 if (nm != NULL) { 474 // Set flag if return address is a method handle call site. 475 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address)); 476 // native nmethods don't have exception handlers 477 assert(!nm->is_native_method(), "no exception handler"); 478 assert(nm->header_begin() != nm->exception_begin(), "no exception handler"); 479 if (nm->is_deopt_pc(return_address)) { 480 // If we come here because of a stack overflow, the stack may be 481 // unguarded. Reguard the stack otherwise if we return to the 482 // deopt blob and the stack bang causes a stack overflow we 483 // crash. 484 bool guard_pages_enabled = thread->stack_guards_enabled(); 485 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); 486 if (thread->reserved_stack_activation() != thread->stack_base()) { 487 thread->set_reserved_stack_activation(thread->stack_base()); 488 } 489 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash"); 490 return SharedRuntime::deopt_blob()->unpack_with_exception(); 491 } else { 492 return nm->exception_begin(); 493 } 494 } 495 496 // Entry code 497 if (StubRoutines::returns_to_call_stub(return_address)) { 498 return StubRoutines::catch_exception_entry(); 499 } 500 // Interpreted code 501 if (Interpreter::contains(return_address)) { 502 return Interpreter::rethrow_exception_entry(); 503 } 504 505 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub"); 506 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!"); 507 508 #ifndef PRODUCT 509 { ResourceMark rm; 510 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address)); 511 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here"); 512 tty->print_cr("b) other problem"); 513 } 514 #endif // PRODUCT 515 516 ShouldNotReachHere(); 517 return NULL; 518 } 519 520 521 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address)) 522 return raw_exception_handler_for_return_address(thread, return_address); 523 JRT_END 524 525 526 address SharedRuntime::get_poll_stub(address pc) { 527 address stub; 528 // Look up the code blob 529 CodeBlob *cb = CodeCache::find_blob(pc); 530 531 // Should be an nmethod 532 guarantee(cb != NULL && cb->is_compiled(), "safepoint polling: pc must refer to an nmethod"); 533 534 // Look up the relocation information 535 assert(((CompiledMethod*)cb)->is_at_poll_or_poll_return(pc), 536 "safepoint polling: type must be poll"); 537 538 #ifdef ASSERT 539 if (!((NativeInstruction*)pc)->is_safepoint_poll()) { 540 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc)); 541 Disassembler::decode(cb); 542 fatal("Only polling locations are used for safepoint"); 543 } 544 #endif 545 546 bool at_poll_return = ((CompiledMethod*)cb)->is_at_poll_return(pc); 547 bool has_wide_vectors = ((CompiledMethod*)cb)->has_wide_vectors(); 548 if (at_poll_return) { 549 assert(SharedRuntime::polling_page_return_handler_blob() != NULL, 550 "polling page return stub not created yet"); 551 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point(); 552 } else if (has_wide_vectors) { 553 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL, 554 "polling page vectors safepoint stub not created yet"); 555 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point(); 556 } else { 557 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL, 558 "polling page safepoint stub not created yet"); 559 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point(); 560 } 561 log_debug(safepoint)("... found polling page %s exception at pc = " 562 INTPTR_FORMAT ", stub =" INTPTR_FORMAT, 563 at_poll_return ? "return" : "loop", 564 (intptr_t)pc, (intptr_t)stub); 565 return stub; 566 } 567 568 569 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) { 570 assert(caller.is_interpreted_frame(), ""); 571 int args_size = ArgumentSizeComputer(sig).size() + 1; 572 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack"); 573 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1)); 574 assert(Universe::heap()->is_in(result) && oopDesc::is_oop(result), "receiver must be an oop"); 575 return result; 576 } 577 578 579 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) { 580 if (JvmtiExport::can_post_on_exceptions()) { 581 vframeStream vfst(thread, true); 582 methodHandle method = methodHandle(thread, vfst.method()); 583 address bcp = method()->bcp_from(vfst.bci()); 584 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception()); 585 } 586 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception); 587 } 588 589 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) { 590 Handle h_exception = Exceptions::new_exception(thread, name, message); 591 throw_and_post_jvmti_exception(thread, h_exception); 592 } 593 594 // The interpreter code to call this tracing function is only 595 // called/generated when UL is on for redefine, class and has the right level 596 // and tags. Since obsolete methods are never compiled, we don't have 597 // to modify the compilers to generate calls to this function. 598 // 599 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry( 600 JavaThread* thread, Method* method)) 601 if (method->is_obsolete()) { 602 // We are calling an obsolete method, but this is not necessarily 603 // an error. Our method could have been redefined just after we 604 // fetched the Method* from the constant pool. 605 ResourceMark rm; 606 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string()); 607 } 608 return 0; 609 JRT_END 610 611 // ret_pc points into caller; we are returning caller's exception handler 612 // for given exception 613 address SharedRuntime::compute_compiled_exc_handler(CompiledMethod* cm, address ret_pc, Handle& exception, 614 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) { 615 assert(cm != NULL, "must exist"); 616 ResourceMark rm; 617 618 #if INCLUDE_JVMCI 619 if (cm->is_compiled_by_jvmci()) { 620 // lookup exception handler for this pc 621 int catch_pco = ret_pc - cm->code_begin(); 622 ExceptionHandlerTable table(cm); 623 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0); 624 if (t != NULL) { 625 return cm->code_begin() + t->pco(); 626 } else { 627 return Deoptimization::deoptimize_for_missing_exception_handler(cm); 628 } 629 } 630 #endif // INCLUDE_JVMCI 631 632 nmethod* nm = cm->as_nmethod(); 633 ScopeDesc* sd = nm->scope_desc_at(ret_pc); 634 // determine handler bci, if any 635 EXCEPTION_MARK; 636 637 int handler_bci = -1; 638 int scope_depth = 0; 639 if (!force_unwind) { 640 int bci = sd->bci(); 641 bool recursive_exception = false; 642 do { 643 bool skip_scope_increment = false; 644 // exception handler lookup 645 Klass* ek = exception->klass(); 646 methodHandle mh(THREAD, sd->method()); 647 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD); 648 if (HAS_PENDING_EXCEPTION) { 649 recursive_exception = true; 650 // We threw an exception while trying to find the exception handler. 651 // Transfer the new exception to the exception handle which will 652 // be set into thread local storage, and do another lookup for an 653 // exception handler for this exception, this time starting at the 654 // BCI of the exception handler which caused the exception to be 655 // thrown (bugs 4307310 and 4546590). Set "exception" reference 656 // argument to ensure that the correct exception is thrown (4870175). 657 recursive_exception_occurred = true; 658 exception = Handle(THREAD, PENDING_EXCEPTION); 659 CLEAR_PENDING_EXCEPTION; 660 if (handler_bci >= 0) { 661 bci = handler_bci; 662 handler_bci = -1; 663 skip_scope_increment = true; 664 } 665 } 666 else { 667 recursive_exception = false; 668 } 669 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) { 670 sd = sd->sender(); 671 if (sd != NULL) { 672 bci = sd->bci(); 673 } 674 ++scope_depth; 675 } 676 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL)); 677 } 678 679 // found handling method => lookup exception handler 680 int catch_pco = ret_pc - nm->code_begin(); 681 682 ExceptionHandlerTable table(nm); 683 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth); 684 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) { 685 // Allow abbreviated catch tables. The idea is to allow a method 686 // to materialize its exceptions without committing to the exact 687 // routing of exceptions. In particular this is needed for adding 688 // a synthetic handler to unlock monitors when inlining 689 // synchronized methods since the unlock path isn't represented in 690 // the bytecodes. 691 t = table.entry_for(catch_pco, -1, 0); 692 } 693 694 #ifdef COMPILER1 695 if (t == NULL && nm->is_compiled_by_c1()) { 696 assert(nm->unwind_handler_begin() != NULL, ""); 697 return nm->unwind_handler_begin(); 698 } 699 #endif 700 701 if (t == NULL) { 702 ttyLocker ttyl; 703 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci); 704 tty->print_cr(" Exception:"); 705 exception->print(); 706 tty->cr(); 707 tty->print_cr(" Compiled exception table :"); 708 table.print(); 709 nm->print_code(); 710 guarantee(false, "missing exception handler"); 711 return NULL; 712 } 713 714 return nm->code_begin() + t->pco(); 715 } 716 717 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread)) 718 // These errors occur only at call sites 719 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError()); 720 JRT_END 721 722 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 723 // These errors occur only at call sites 724 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub"); 725 JRT_END 726 727 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread)) 728 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 729 JRT_END 730 731 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread)) 732 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 733 JRT_END 734 735 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread)) 736 // This entry point is effectively only used for NullPointerExceptions which occur at inline 737 // cache sites (when the callee activation is not yet set up) so we are at a call site 738 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 739 JRT_END 740 741 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread)) 742 throw_StackOverflowError_common(thread, false); 743 JRT_END 744 745 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread)) 746 throw_StackOverflowError_common(thread, true); 747 JRT_END 748 749 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) { 750 // We avoid using the normal exception construction in this case because 751 // it performs an upcall to Java, and we're already out of stack space. 752 Thread* THREAD = thread; 753 Klass* k = SystemDictionary::StackOverflowError_klass(); 754 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK); 755 if (delayed) { 756 java_lang_Throwable::set_message(exception_oop, 757 Universe::delayed_stack_overflow_error_message()); 758 } 759 Handle exception (thread, exception_oop); 760 if (StackTraceInThrowable) { 761 java_lang_Throwable::fill_in_stack_trace(exception); 762 } 763 // Increment counter for hs_err file reporting 764 Atomic::inc(&Exceptions::_stack_overflow_errors); 765 throw_and_post_jvmti_exception(thread, exception); 766 } 767 768 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread, 769 address pc, 770 ImplicitExceptionKind exception_kind) 771 { 772 address target_pc = NULL; 773 774 if (Interpreter::contains(pc)) { 775 #ifdef CC_INTERP 776 // C++ interpreter doesn't throw implicit exceptions 777 ShouldNotReachHere(); 778 #else 779 switch (exception_kind) { 780 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry(); 781 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry(); 782 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry(); 783 default: ShouldNotReachHere(); 784 } 785 #endif // !CC_INTERP 786 } else { 787 switch (exception_kind) { 788 case STACK_OVERFLOW: { 789 // Stack overflow only occurs upon frame setup; the callee is 790 // going to be unwound. Dispatch to a shared runtime stub 791 // which will cause the StackOverflowError to be fabricated 792 // and processed. 793 // Stack overflow should never occur during deoptimization: 794 // the compiled method bangs the stack by as much as the 795 // interpreter would need in case of a deoptimization. The 796 // deoptimization blob and uncommon trap blob bang the stack 797 // in a debug VM to verify the correctness of the compiled 798 // method stack banging. 799 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap"); 800 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc)); 801 return StubRoutines::throw_StackOverflowError_entry(); 802 } 803 804 case IMPLICIT_NULL: { 805 if (VtableStubs::contains(pc)) { 806 // We haven't yet entered the callee frame. Fabricate an 807 // exception and begin dispatching it in the caller. Since 808 // the caller was at a call site, it's safe to destroy all 809 // caller-saved registers, as these entry points do. 810 VtableStub* vt_stub = VtableStubs::stub_containing(pc); 811 812 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error. 813 if (vt_stub == NULL) return NULL; 814 815 if (vt_stub->is_abstract_method_error(pc)) { 816 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs"); 817 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc)); 818 // Instead of throwing the abstract method error here directly, we re-resolve 819 // and will throw the AbstractMethodError during resolve. As a result, we'll 820 // get a more detailed error message. 821 return SharedRuntime::get_handle_wrong_method_stub(); 822 } else { 823 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc)); 824 // Assert that the signal comes from the expected location in stub code. 825 assert(vt_stub->is_null_pointer_exception(pc), 826 "obtained signal from unexpected location in stub code"); 827 return StubRoutines::throw_NullPointerException_at_call_entry(); 828 } 829 } else { 830 CodeBlob* cb = CodeCache::find_blob(pc); 831 832 // If code blob is NULL, then return NULL to signal handler to report the SEGV error. 833 if (cb == NULL) return NULL; 834 835 // Exception happened in CodeCache. Must be either: 836 // 1. Inline-cache check in C2I handler blob, 837 // 2. Inline-cache check in nmethod, or 838 // 3. Implicit null exception in nmethod 839 840 if (!cb->is_compiled()) { 841 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob(); 842 if (!is_in_blob) { 843 // Allow normal crash reporting to handle this 844 return NULL; 845 } 846 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc)); 847 // There is no handler here, so we will simply unwind. 848 return StubRoutines::throw_NullPointerException_at_call_entry(); 849 } 850 851 // Otherwise, it's a compiled method. Consult its exception handlers. 852 CompiledMethod* cm = (CompiledMethod*)cb; 853 if (cm->inlinecache_check_contains(pc)) { 854 // exception happened inside inline-cache check code 855 // => the nmethod is not yet active (i.e., the frame 856 // is not set up yet) => use return address pushed by 857 // caller => don't push another return address 858 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc)); 859 return StubRoutines::throw_NullPointerException_at_call_entry(); 860 } 861 862 if (cm->method()->is_method_handle_intrinsic()) { 863 // exception happened inside MH dispatch code, similar to a vtable stub 864 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc)); 865 return StubRoutines::throw_NullPointerException_at_call_entry(); 866 } 867 868 #ifndef PRODUCT 869 _implicit_null_throws++; 870 #endif 871 target_pc = cm->continuation_for_implicit_null_exception(pc); 872 // If there's an unexpected fault, target_pc might be NULL, 873 // in which case we want to fall through into the normal 874 // error handling code. 875 } 876 877 break; // fall through 878 } 879 880 881 case IMPLICIT_DIVIDE_BY_ZERO: { 882 CompiledMethod* cm = CodeCache::find_compiled(pc); 883 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions"); 884 #ifndef PRODUCT 885 _implicit_div0_throws++; 886 #endif 887 target_pc = cm->continuation_for_implicit_div0_exception(pc); 888 // If there's an unexpected fault, target_pc might be NULL, 889 // in which case we want to fall through into the normal 890 // error handling code. 891 break; // fall through 892 } 893 894 default: ShouldNotReachHere(); 895 } 896 897 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind"); 898 899 if (exception_kind == IMPLICIT_NULL) { 900 #ifndef PRODUCT 901 // for AbortVMOnException flag 902 Exceptions::debug_check_abort("java.lang.NullPointerException"); 903 #endif //PRODUCT 904 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc)); 905 } else { 906 #ifndef PRODUCT 907 // for AbortVMOnException flag 908 Exceptions::debug_check_abort("java.lang.ArithmeticException"); 909 #endif //PRODUCT 910 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc)); 911 } 912 return target_pc; 913 } 914 915 ShouldNotReachHere(); 916 return NULL; 917 } 918 919 920 /** 921 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is 922 * installed in the native function entry of all native Java methods before 923 * they get linked to their actual native methods. 924 * 925 * \note 926 * This method actually never gets called! The reason is because 927 * the interpreter's native entries call NativeLookup::lookup() which 928 * throws the exception when the lookup fails. The exception is then 929 * caught and forwarded on the return from NativeLookup::lookup() call 930 * before the call to the native function. This might change in the future. 931 */ 932 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...)) 933 { 934 // We return a bad value here to make sure that the exception is 935 // forwarded before we look at the return value. 936 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress); 937 } 938 JNI_END 939 940 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() { 941 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error); 942 } 943 944 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) 945 #if INCLUDE_JVMCI 946 if (!obj->klass()->has_finalizer()) { 947 return; 948 } 949 #endif // INCLUDE_JVMCI 950 assert(oopDesc::is_oop(obj), "must be a valid oop"); 951 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise"); 952 InstanceKlass::register_finalizer(instanceOop(obj), CHECK); 953 JRT_END 954 955 956 jlong SharedRuntime::get_java_tid(Thread* thread) { 957 if (thread != NULL) { 958 if (thread->is_Java_thread()) { 959 oop obj = ((JavaThread*)thread)->threadObj(); 960 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj); 961 } 962 } 963 return 0; 964 } 965 966 /** 967 * This function ought to be a void function, but cannot be because 968 * it gets turned into a tail-call on sparc, which runs into dtrace bug 969 * 6254741. Once that is fixed we can remove the dummy return value. 970 */ 971 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) { 972 return dtrace_object_alloc_base(Thread::current(), o, size); 973 } 974 975 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) { 976 assert(DTraceAllocProbes, "wrong call"); 977 Klass* klass = o->klass(); 978 Symbol* name = klass->name(); 979 HOTSPOT_OBJECT_ALLOC( 980 get_java_tid(thread), 981 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize); 982 return 0; 983 } 984 985 JRT_LEAF(int, SharedRuntime::dtrace_method_entry( 986 JavaThread* thread, Method* method)) 987 assert(DTraceMethodProbes, "wrong call"); 988 Symbol* kname = method->klass_name(); 989 Symbol* name = method->name(); 990 Symbol* sig = method->signature(); 991 HOTSPOT_METHOD_ENTRY( 992 get_java_tid(thread), 993 (char *) kname->bytes(), kname->utf8_length(), 994 (char *) name->bytes(), name->utf8_length(), 995 (char *) sig->bytes(), sig->utf8_length()); 996 return 0; 997 JRT_END 998 999 JRT_LEAF(int, SharedRuntime::dtrace_method_exit( 1000 JavaThread* thread, Method* method)) 1001 assert(DTraceMethodProbes, "wrong call"); 1002 Symbol* kname = method->klass_name(); 1003 Symbol* name = method->name(); 1004 Symbol* sig = method->signature(); 1005 HOTSPOT_METHOD_RETURN( 1006 get_java_tid(thread), 1007 (char *) kname->bytes(), kname->utf8_length(), 1008 (char *) name->bytes(), name->utf8_length(), 1009 (char *) sig->bytes(), sig->utf8_length()); 1010 return 0; 1011 JRT_END 1012 1013 1014 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode) 1015 // for a call current in progress, i.e., arguments has been pushed on stack 1016 // put callee has not been invoked yet. Used by: resolve virtual/static, 1017 // vtable updates, etc. Caller frame must be compiled. 1018 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) { 1019 ResourceMark rm(THREAD); 1020 1021 // last java frame on stack (which includes native call frames) 1022 vframeStream vfst(thread, true); // Do not skip and javaCalls 1023 1024 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD); 1025 } 1026 1027 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) { 1028 CompiledMethod* caller = vfst.nm(); 1029 1030 nmethodLocker caller_lock(caller); 1031 1032 address pc = vfst.frame_pc(); 1033 { // Get call instruction under lock because another thread may be busy patching it. 1034 CompiledICLocker ic_locker(caller); 1035 return caller->attached_method_before_pc(pc); 1036 } 1037 return NULL; 1038 } 1039 1040 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode 1041 // for a call current in progress, i.e., arguments has been pushed on stack 1042 // but callee has not been invoked yet. Caller frame must be compiled. 1043 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread, 1044 vframeStream& vfst, 1045 Bytecodes::Code& bc, 1046 CallInfo& callinfo, TRAPS) { 1047 Handle receiver; 1048 Handle nullHandle; //create a handy null handle for exception returns 1049 1050 assert(!vfst.at_end(), "Java frame must exist"); 1051 1052 // Find caller and bci from vframe 1053 methodHandle caller(THREAD, vfst.method()); 1054 int bci = vfst.bci(); 1055 1056 Bytecode_invoke bytecode(caller, bci); 1057 int bytecode_index = bytecode.index(); 1058 bc = bytecode.invoke_code(); 1059 1060 methodHandle attached_method = extract_attached_method(vfst); 1061 if (attached_method.not_null()) { 1062 methodHandle callee = bytecode.static_target(CHECK_NH); 1063 vmIntrinsics::ID id = callee->intrinsic_id(); 1064 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call, 1065 // it attaches statically resolved method to the call site. 1066 if (MethodHandles::is_signature_polymorphic(id) && 1067 MethodHandles::is_signature_polymorphic_intrinsic(id)) { 1068 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id); 1069 1070 // Adjust invocation mode according to the attached method. 1071 switch (bc) { 1072 case Bytecodes::_invokevirtual: 1073 if (attached_method->method_holder()->is_interface()) { 1074 bc = Bytecodes::_invokeinterface; 1075 } 1076 break; 1077 case Bytecodes::_invokeinterface: 1078 if (!attached_method->method_holder()->is_interface()) { 1079 bc = Bytecodes::_invokevirtual; 1080 } 1081 break; 1082 case Bytecodes::_invokehandle: 1083 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) { 1084 bc = attached_method->is_static() ? Bytecodes::_invokestatic 1085 : Bytecodes::_invokevirtual; 1086 } 1087 break; 1088 default: 1089 break; 1090 } 1091 } 1092 } 1093 1094 assert(bc != Bytecodes::_illegal, "not initialized"); 1095 1096 bool has_receiver = bc != Bytecodes::_invokestatic && 1097 bc != Bytecodes::_invokedynamic && 1098 bc != Bytecodes::_invokehandle; 1099 1100 // Find receiver for non-static call 1101 if (has_receiver) { 1102 // This register map must be update since we need to find the receiver for 1103 // compiled frames. The receiver might be in a register. 1104 RegisterMap reg_map2(thread); 1105 frame stubFrame = thread->last_frame(); 1106 // Caller-frame is a compiled frame 1107 frame callerFrame = stubFrame.sender(®_map2); 1108 1109 if (attached_method.is_null()) { 1110 methodHandle callee = bytecode.static_target(CHECK_NH); 1111 if (callee.is_null()) { 1112 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle); 1113 } 1114 } 1115 1116 // Retrieve from a compiled argument list 1117 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2)); 1118 1119 if (receiver.is_null()) { 1120 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle); 1121 } 1122 } 1123 1124 // Resolve method 1125 if (attached_method.not_null()) { 1126 // Parameterized by attached method. 1127 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH); 1128 } else { 1129 // Parameterized by bytecode. 1130 constantPoolHandle constants(THREAD, caller->constants()); 1131 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH); 1132 } 1133 1134 #ifdef ASSERT 1135 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls 1136 if (has_receiver) { 1137 assert(receiver.not_null(), "should have thrown exception"); 1138 Klass* receiver_klass = receiver->klass(); 1139 Klass* rk = NULL; 1140 if (attached_method.not_null()) { 1141 // In case there's resolved method attached, use its holder during the check. 1142 rk = attached_method->method_holder(); 1143 } else { 1144 // Klass is already loaded. 1145 constantPoolHandle constants(THREAD, caller->constants()); 1146 rk = constants->klass_ref_at(bytecode_index, CHECK_NH); 1147 } 1148 Klass* static_receiver_klass = rk; 1149 methodHandle callee = callinfo.selected_method(); 1150 assert(receiver_klass->is_subtype_of(static_receiver_klass), 1151 "actual receiver must be subclass of static receiver klass"); 1152 if (receiver_klass->is_instance_klass()) { 1153 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) { 1154 tty->print_cr("ERROR: Klass not yet initialized!!"); 1155 receiver_klass->print(); 1156 } 1157 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized"); 1158 } 1159 } 1160 #endif 1161 1162 return receiver; 1163 } 1164 1165 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) { 1166 ResourceMark rm(THREAD); 1167 // We need first to check if any Java activations (compiled, interpreted) 1168 // exist on the stack since last JavaCall. If not, we need 1169 // to get the target method from the JavaCall wrapper. 1170 vframeStream vfst(thread, true); // Do not skip any javaCalls 1171 methodHandle callee_method; 1172 if (vfst.at_end()) { 1173 // No Java frames were found on stack since we did the JavaCall. 1174 // Hence the stack can only contain an entry_frame. We need to 1175 // find the target method from the stub frame. 1176 RegisterMap reg_map(thread, false); 1177 frame fr = thread->last_frame(); 1178 assert(fr.is_runtime_frame(), "must be a runtimeStub"); 1179 fr = fr.sender(®_map); 1180 assert(fr.is_entry_frame(), "must be"); 1181 // fr is now pointing to the entry frame. 1182 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method()); 1183 } else { 1184 Bytecodes::Code bc; 1185 CallInfo callinfo; 1186 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle())); 1187 callee_method = callinfo.selected_method(); 1188 } 1189 assert(callee_method()->is_method(), "must be"); 1190 return callee_method; 1191 } 1192 1193 // Resolves a call. 1194 methodHandle SharedRuntime::resolve_helper(JavaThread *thread, 1195 bool is_virtual, 1196 bool is_optimized, TRAPS) { 1197 methodHandle callee_method; 1198 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1199 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 1200 int retry_count = 0; 1201 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() && 1202 callee_method->method_holder() != SystemDictionary::Object_klass()) { 1203 // If has a pending exception then there is no need to re-try to 1204 // resolve this method. 1205 // If the method has been redefined, we need to try again. 1206 // Hack: we have no way to update the vtables of arrays, so don't 1207 // require that java.lang.Object has been updated. 1208 1209 // It is very unlikely that method is redefined more than 100 times 1210 // in the middle of resolve. If it is looping here more than 100 times 1211 // means then there could be a bug here. 1212 guarantee((retry_count++ < 100), 1213 "Could not resolve to latest version of redefined method"); 1214 // method is redefined in the middle of resolve so re-try. 1215 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1216 } 1217 } 1218 return callee_method; 1219 } 1220 1221 // This fails if resolution required refilling of IC stubs 1222 bool SharedRuntime::resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame, 1223 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized, 1224 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS) { 1225 StaticCallInfo static_call_info; 1226 CompiledICInfo virtual_call_info; 1227 1228 // Make sure the callee nmethod does not get deoptimized and removed before 1229 // we are done patching the code. 1230 CompiledMethod* callee = callee_method->code(); 1231 1232 if (callee != NULL) { 1233 assert(callee->is_compiled(), "must be nmethod for patching"); 1234 } 1235 1236 if (callee != NULL && !callee->is_in_use()) { 1237 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded. 1238 callee = NULL; 1239 } 1240 nmethodLocker nl_callee(callee); 1241 #ifdef ASSERT 1242 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below 1243 #endif 1244 1245 bool is_nmethod = caller_nm->is_nmethod(); 1246 1247 if (is_virtual) { 1248 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check"); 1249 bool static_bound = call_info.resolved_method()->can_be_statically_bound(); 1250 Klass* klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass(); 1251 CompiledIC::compute_monomorphic_entry(callee_method, klass, 1252 is_optimized, static_bound, is_nmethod, virtual_call_info, 1253 CHECK_false); 1254 } else { 1255 // static call 1256 CompiledStaticCall::compute_entry(callee_method, is_nmethod, static_call_info); 1257 } 1258 1259 // grab lock, check for deoptimization and potentially patch caller 1260 { 1261 CompiledICLocker ml(caller_nm); 1262 1263 // Lock blocks for safepoint during which both nmethods can change state. 1264 1265 // Now that we are ready to patch if the Method* was redefined then 1266 // don't update call site and let the caller retry. 1267 // Don't update call site if callee nmethod was unloaded or deoptimized. 1268 // Don't update call site if callee nmethod was replaced by an other nmethod 1269 // which may happen when multiply alive nmethod (tiered compilation) 1270 // will be supported. 1271 if (!callee_method->is_old() && 1272 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) { 1273 NoSafepointVerifier nsv; 1274 #ifdef ASSERT 1275 // We must not try to patch to jump to an already unloaded method. 1276 if (dest_entry_point != 0) { 1277 CodeBlob* cb = CodeCache::find_blob(dest_entry_point); 1278 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee), 1279 "should not call unloaded nmethod"); 1280 } 1281 #endif 1282 if (is_virtual) { 1283 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc()); 1284 if (inline_cache->is_clean()) { 1285 if (!inline_cache->set_to_monomorphic(virtual_call_info)) { 1286 return false; 1287 } 1288 } 1289 } else { 1290 if (VM_Version::supports_fast_class_init_checks() && 1291 invoke_code == Bytecodes::_invokestatic && 1292 callee_method->needs_clinit_barrier() && 1293 callee != NULL && (callee->is_compiled_by_jvmci() || callee->is_aot())) { 1294 return true; // skip patching for JVMCI or AOT code 1295 } 1296 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc()); 1297 if (ssc->is_clean()) ssc->set(static_call_info); 1298 } 1299 } 1300 } // unlock CompiledICLocker 1301 return true; 1302 } 1303 1304 // Resolves a call. The compilers generate code for calls that go here 1305 // and are patched with the real destination of the call. 1306 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread, 1307 bool is_virtual, 1308 bool is_optimized, TRAPS) { 1309 1310 ResourceMark rm(thread); 1311 RegisterMap cbl_map(thread, false); 1312 frame caller_frame = thread->last_frame().sender(&cbl_map); 1313 1314 CodeBlob* caller_cb = caller_frame.cb(); 1315 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method"); 1316 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null(); 1317 1318 // make sure caller is not getting deoptimized 1319 // and removed before we are done with it. 1320 // CLEANUP - with lazy deopt shouldn't need this lock 1321 nmethodLocker caller_lock(caller_nm); 1322 1323 // determine call info & receiver 1324 // note: a) receiver is NULL for static calls 1325 // b) an exception is thrown if receiver is NULL for non-static calls 1326 CallInfo call_info; 1327 Bytecodes::Code invoke_code = Bytecodes::_illegal; 1328 Handle receiver = find_callee_info(thread, invoke_code, 1329 call_info, CHECK_(methodHandle())); 1330 methodHandle callee_method = call_info.selected_method(); 1331 1332 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) || 1333 (!is_virtual && invoke_code == Bytecodes::_invokespecial) || 1334 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) || 1335 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) || 1336 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode"); 1337 1338 assert(caller_nm->is_alive() && !caller_nm->is_unloading(), "It should be alive"); 1339 1340 #ifndef PRODUCT 1341 // tracing/debugging/statistics 1342 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) : 1343 (is_virtual) ? (&_resolve_virtual_ctr) : 1344 (&_resolve_static_ctr); 1345 Atomic::inc(addr); 1346 1347 if (TraceCallFixup) { 1348 ResourceMark rm(thread); 1349 tty->print("resolving %s%s (%s) call to", 1350 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static", 1351 Bytecodes::name(invoke_code)); 1352 callee_method->print_short_name(tty); 1353 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, 1354 p2i(caller_frame.pc()), p2i(callee_method->code())); 1355 } 1356 #endif 1357 1358 if (invoke_code == Bytecodes::_invokestatic) { 1359 assert(callee_method->method_holder()->is_initialized() || 1360 callee_method->method_holder()->is_reentrant_initialization(thread), 1361 "invalid class initialization state for invoke_static"); 1362 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) { 1363 // In order to keep class initialization check, do not patch call 1364 // site for static call when the class is not fully initialized. 1365 // Proper check is enforced by call site re-resolution on every invocation. 1366 // 1367 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true), 1368 // explicit class initialization check is put in nmethod entry (VEP). 1369 assert(callee_method->method_holder()->is_linked(), "must be"); 1370 return callee_method; 1371 } 1372 } 1373 1374 // JSR 292 key invariant: 1375 // If the resolved method is a MethodHandle invoke target, the call 1376 // site must be a MethodHandle call site, because the lambda form might tail-call 1377 // leaving the stack in a state unknown to either caller or callee 1378 // TODO detune for now but we might need it again 1379 // assert(!callee_method->is_compiled_lambda_form() || 1380 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site"); 1381 1382 // Compute entry points. This might require generation of C2I converter 1383 // frames, so we cannot be holding any locks here. Furthermore, the 1384 // computation of the entry points is independent of patching the call. We 1385 // always return the entry-point, but we only patch the stub if the call has 1386 // not been deoptimized. Return values: For a virtual call this is an 1387 // (cached_oop, destination address) pair. For a static call/optimized 1388 // virtual this is just a destination address. 1389 1390 // Patching IC caches may fail if we run out if transition stubs. 1391 // We refill the ic stubs then and try again. 1392 for (;;) { 1393 ICRefillVerifier ic_refill_verifier; 1394 bool successful = resolve_sub_helper_internal(callee_method, caller_frame, caller_nm, 1395 is_virtual, is_optimized, receiver, 1396 call_info, invoke_code, CHECK_(methodHandle())); 1397 if (successful) { 1398 return callee_method; 1399 } else { 1400 InlineCacheBuffer::refill_ic_stubs(); 1401 } 1402 } 1403 1404 } 1405 1406 1407 // Inline caches exist only in compiled code 1408 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread)) 1409 #ifdef ASSERT 1410 RegisterMap reg_map(thread, false); 1411 frame stub_frame = thread->last_frame(); 1412 assert(stub_frame.is_runtime_frame(), "sanity check"); 1413 frame caller_frame = stub_frame.sender(®_map); 1414 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame"); 1415 #endif /* ASSERT */ 1416 1417 methodHandle callee_method; 1418 JRT_BLOCK 1419 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL); 1420 // Return Method* through TLS 1421 thread->set_vm_result_2(callee_method()); 1422 JRT_BLOCK_END 1423 // return compiled code entry point after potential safepoints 1424 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1425 return callee_method->verified_code_entry(); 1426 JRT_END 1427 1428 1429 // Handle call site that has been made non-entrant 1430 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread)) 1431 // 6243940 We might end up in here if the callee is deoptimized 1432 // as we race to call it. We don't want to take a safepoint if 1433 // the caller was interpreted because the caller frame will look 1434 // interpreted to the stack walkers and arguments are now 1435 // "compiled" so it is much better to make this transition 1436 // invisible to the stack walking code. The i2c path will 1437 // place the callee method in the callee_target. It is stashed 1438 // there because if we try and find the callee by normal means a 1439 // safepoint is possible and have trouble gc'ing the compiled args. 1440 RegisterMap reg_map(thread, false); 1441 frame stub_frame = thread->last_frame(); 1442 assert(stub_frame.is_runtime_frame(), "sanity check"); 1443 frame caller_frame = stub_frame.sender(®_map); 1444 1445 if (caller_frame.is_interpreted_frame() || 1446 caller_frame.is_entry_frame()) { 1447 Method* callee = thread->callee_target(); 1448 guarantee(callee != NULL && callee->is_method(), "bad handshake"); 1449 thread->set_vm_result_2(callee); 1450 thread->set_callee_target(NULL); 1451 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) { 1452 // Bypass class initialization checks in c2i when caller is in native. 1453 // JNI calls to static methods don't have class initialization checks. 1454 // Fast class initialization checks are present in c2i adapters and call into 1455 // SharedRuntime::handle_wrong_method() on the slow path. 1456 // 1457 // JVM upcalls may land here as well, but there's a proper check present in 1458 // LinkResolver::resolve_static_call (called from JavaCalls::call_static), 1459 // so bypassing it in c2i adapter is benign. 1460 return callee->get_c2i_no_clinit_check_entry(); 1461 } else { 1462 return callee->get_c2i_entry(); 1463 } 1464 } 1465 1466 // Must be compiled to compiled path which is safe to stackwalk 1467 methodHandle callee_method; 1468 JRT_BLOCK 1469 // Force resolving of caller (if we called from compiled frame) 1470 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL); 1471 thread->set_vm_result_2(callee_method()); 1472 JRT_BLOCK_END 1473 // return compiled code entry point after potential safepoints 1474 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1475 return callee_method->verified_code_entry(); 1476 JRT_END 1477 1478 // Handle abstract method call 1479 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread)) 1480 // Verbose error message for AbstractMethodError. 1481 // Get the called method from the invoke bytecode. 1482 vframeStream vfst(thread, true); 1483 assert(!vfst.at_end(), "Java frame must exist"); 1484 methodHandle caller(vfst.method()); 1485 Bytecode_invoke invoke(caller, vfst.bci()); 1486 DEBUG_ONLY( invoke.verify(); ) 1487 1488 // Find the compiled caller frame. 1489 RegisterMap reg_map(thread); 1490 frame stubFrame = thread->last_frame(); 1491 assert(stubFrame.is_runtime_frame(), "must be"); 1492 frame callerFrame = stubFrame.sender(®_map); 1493 assert(callerFrame.is_compiled_frame(), "must be"); 1494 1495 // Install exception and return forward entry. 1496 address res = StubRoutines::throw_AbstractMethodError_entry(); 1497 JRT_BLOCK 1498 methodHandle callee = invoke.static_target(thread); 1499 if (!callee.is_null()) { 1500 oop recv = callerFrame.retrieve_receiver(®_map); 1501 Klass *recv_klass = (recv != NULL) ? recv->klass() : NULL; 1502 LinkResolver::throw_abstract_method_error(callee, recv_klass, thread); 1503 res = StubRoutines::forward_exception_entry(); 1504 } 1505 JRT_BLOCK_END 1506 return res; 1507 JRT_END 1508 1509 1510 // resolve a static call and patch code 1511 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread )) 1512 methodHandle callee_method; 1513 JRT_BLOCK 1514 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL); 1515 thread->set_vm_result_2(callee_method()); 1516 JRT_BLOCK_END 1517 // return compiled code entry point after potential safepoints 1518 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1519 return callee_method->verified_code_entry(); 1520 JRT_END 1521 1522 1523 // resolve virtual call and update inline cache to monomorphic 1524 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread )) 1525 methodHandle callee_method; 1526 JRT_BLOCK 1527 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL); 1528 thread->set_vm_result_2(callee_method()); 1529 JRT_BLOCK_END 1530 // return compiled code entry point after potential safepoints 1531 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1532 return callee_method->verified_code_entry(); 1533 JRT_END 1534 1535 1536 // Resolve a virtual call that can be statically bound (e.g., always 1537 // monomorphic, so it has no inline cache). Patch code to resolved target. 1538 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread)) 1539 methodHandle callee_method; 1540 JRT_BLOCK 1541 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL); 1542 thread->set_vm_result_2(callee_method()); 1543 JRT_BLOCK_END 1544 // return compiled code entry point after potential safepoints 1545 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1546 return callee_method->verified_code_entry(); 1547 JRT_END 1548 1549 // The handle_ic_miss_helper_internal function returns false if it failed due 1550 // to either running out of vtable stubs or ic stubs due to IC transitions 1551 // to transitional states. The needs_ic_stub_refill value will be set if 1552 // the failure was due to running out of IC stubs, in which case handle_ic_miss_helper 1553 // refills the IC stubs and tries again. 1554 bool SharedRuntime::handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, 1555 const frame& caller_frame, methodHandle callee_method, 1556 Bytecodes::Code bc, CallInfo& call_info, 1557 bool& needs_ic_stub_refill, TRAPS) { 1558 CompiledICLocker ml(caller_nm); 1559 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc()); 1560 bool should_be_mono = false; 1561 if (inline_cache->is_optimized()) { 1562 if (TraceCallFixup) { 1563 ResourceMark rm(THREAD); 1564 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc)); 1565 callee_method->print_short_name(tty); 1566 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1567 } 1568 should_be_mono = true; 1569 } else if (inline_cache->is_icholder_call()) { 1570 CompiledICHolder* ic_oop = inline_cache->cached_icholder(); 1571 if (ic_oop != NULL) { 1572 if (!ic_oop->is_loader_alive()) { 1573 // Deferred IC cleaning due to concurrent class unloading 1574 if (!inline_cache->set_to_clean()) { 1575 needs_ic_stub_refill = true; 1576 return false; 1577 } 1578 } else if (receiver()->klass() == ic_oop->holder_klass()) { 1579 // This isn't a real miss. We must have seen that compiled code 1580 // is now available and we want the call site converted to a 1581 // monomorphic compiled call site. 1582 // We can't assert for callee_method->code() != NULL because it 1583 // could have been deoptimized in the meantime 1584 if (TraceCallFixup) { 1585 ResourceMark rm(THREAD); 1586 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc)); 1587 callee_method->print_short_name(tty); 1588 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1589 } 1590 should_be_mono = true; 1591 } 1592 } 1593 } 1594 1595 if (should_be_mono) { 1596 // We have a path that was monomorphic but was going interpreted 1597 // and now we have (or had) a compiled entry. We correct the IC 1598 // by using a new icBuffer. 1599 CompiledICInfo info; 1600 Klass* receiver_klass = receiver()->klass(); 1601 inline_cache->compute_monomorphic_entry(callee_method, 1602 receiver_klass, 1603 inline_cache->is_optimized(), 1604 false, caller_nm->is_nmethod(), 1605 info, CHECK_false); 1606 if (!inline_cache->set_to_monomorphic(info)) { 1607 needs_ic_stub_refill = true; 1608 return false; 1609 } 1610 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) { 1611 // Potential change to megamorphic 1612 1613 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, needs_ic_stub_refill, CHECK_false); 1614 if (needs_ic_stub_refill) { 1615 return false; 1616 } 1617 if (!successful) { 1618 if (!inline_cache->set_to_clean()) { 1619 needs_ic_stub_refill = true; 1620 return false; 1621 } 1622 } 1623 } else { 1624 // Either clean or megamorphic 1625 } 1626 return true; 1627 } 1628 1629 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) { 1630 ResourceMark rm(thread); 1631 CallInfo call_info; 1632 Bytecodes::Code bc; 1633 1634 // receiver is NULL for static calls. An exception is thrown for NULL 1635 // receivers for non-static calls 1636 Handle receiver = find_callee_info(thread, bc, call_info, 1637 CHECK_(methodHandle())); 1638 // Compiler1 can produce virtual call sites that can actually be statically bound 1639 // If we fell thru to below we would think that the site was going megamorphic 1640 // when in fact the site can never miss. Worse because we'd think it was megamorphic 1641 // we'd try and do a vtable dispatch however methods that can be statically bound 1642 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a 1643 // reresolution of the call site (as if we did a handle_wrong_method and not an 1644 // plain ic_miss) and the site will be converted to an optimized virtual call site 1645 // never to miss again. I don't believe C2 will produce code like this but if it 1646 // did this would still be the correct thing to do for it too, hence no ifdef. 1647 // 1648 if (call_info.resolved_method()->can_be_statically_bound()) { 1649 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle())); 1650 if (TraceCallFixup) { 1651 RegisterMap reg_map(thread, false); 1652 frame caller_frame = thread->last_frame().sender(®_map); 1653 ResourceMark rm(thread); 1654 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc)); 1655 callee_method->print_short_name(tty); 1656 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc())); 1657 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1658 } 1659 return callee_method; 1660 } 1661 1662 methodHandle callee_method = call_info.selected_method(); 1663 1664 #ifndef PRODUCT 1665 Atomic::inc(&_ic_miss_ctr); 1666 1667 // Statistics & Tracing 1668 if (TraceCallFixup) { 1669 ResourceMark rm(thread); 1670 tty->print("IC miss (%s) call to", Bytecodes::name(bc)); 1671 callee_method->print_short_name(tty); 1672 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1673 } 1674 1675 if (ICMissHistogram) { 1676 MutexLocker m(VMStatistic_lock); 1677 RegisterMap reg_map(thread, false); 1678 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub 1679 // produce statistics under the lock 1680 trace_ic_miss(f.pc()); 1681 } 1682 #endif 1683 1684 // install an event collector so that when a vtable stub is created the 1685 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The 1686 // event can't be posted when the stub is created as locks are held 1687 // - instead the event will be deferred until the event collector goes 1688 // out of scope. 1689 JvmtiDynamicCodeEventCollector event_collector; 1690 1691 // Update inline cache to megamorphic. Skip update if we are called from interpreted. 1692 // Transitioning IC caches may require transition stubs. If we run out 1693 // of transition stubs, we have to drop locks and perform a safepoint 1694 // that refills them. 1695 RegisterMap reg_map(thread, false); 1696 frame caller_frame = thread->last_frame().sender(®_map); 1697 CodeBlob* cb = caller_frame.cb(); 1698 CompiledMethod* caller_nm = cb->as_compiled_method(); 1699 1700 for (;;) { 1701 ICRefillVerifier ic_refill_verifier; 1702 bool needs_ic_stub_refill = false; 1703 bool successful = handle_ic_miss_helper_internal(receiver, caller_nm, caller_frame, callee_method, 1704 bc, call_info, needs_ic_stub_refill, CHECK_(methodHandle())); 1705 if (successful || !needs_ic_stub_refill) { 1706 return callee_method; 1707 } else { 1708 InlineCacheBuffer::refill_ic_stubs(); 1709 } 1710 } 1711 } 1712 1713 static bool clear_ic_at_addr(CompiledMethod* caller_nm, address call_addr, bool is_static_call) { 1714 CompiledICLocker ml(caller_nm); 1715 if (is_static_call) { 1716 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr); 1717 if (!ssc->is_clean()) { 1718 return ssc->set_to_clean(); 1719 } 1720 } else { 1721 // compiled, dispatched call (which used to call an interpreted method) 1722 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr); 1723 if (!inline_cache->is_clean()) { 1724 return inline_cache->set_to_clean(); 1725 } 1726 } 1727 return true; 1728 } 1729 1730 // 1731 // Resets a call-site in compiled code so it will get resolved again. 1732 // This routines handles both virtual call sites, optimized virtual call 1733 // sites, and static call sites. Typically used to change a call sites 1734 // destination from compiled to interpreted. 1735 // 1736 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) { 1737 ResourceMark rm(thread); 1738 RegisterMap reg_map(thread, false); 1739 frame stub_frame = thread->last_frame(); 1740 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub"); 1741 frame caller = stub_frame.sender(®_map); 1742 1743 // Do nothing if the frame isn't a live compiled frame. 1744 // nmethod could be deoptimized by the time we get here 1745 // so no update to the caller is needed. 1746 1747 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) { 1748 1749 address pc = caller.pc(); 1750 1751 // Check for static or virtual call 1752 bool is_static_call = false; 1753 CompiledMethod* caller_nm = CodeCache::find_compiled(pc); 1754 1755 // Default call_addr is the location of the "basic" call. 1756 // Determine the address of the call we a reresolving. With 1757 // Inline Caches we will always find a recognizable call. 1758 // With Inline Caches disabled we may or may not find a 1759 // recognizable call. We will always find a call for static 1760 // calls and for optimized virtual calls. For vanilla virtual 1761 // calls it depends on the state of the UseInlineCaches switch. 1762 // 1763 // With Inline Caches disabled we can get here for a virtual call 1764 // for two reasons: 1765 // 1 - calling an abstract method. The vtable for abstract methods 1766 // will run us thru handle_wrong_method and we will eventually 1767 // end up in the interpreter to throw the ame. 1768 // 2 - a racing deoptimization. We could be doing a vanilla vtable 1769 // call and between the time we fetch the entry address and 1770 // we jump to it the target gets deoptimized. Similar to 1 1771 // we will wind up in the interprter (thru a c2i with c2). 1772 // 1773 address call_addr = NULL; 1774 { 1775 // Get call instruction under lock because another thread may be 1776 // busy patching it. 1777 CompiledICLocker ml(caller_nm); 1778 // Location of call instruction 1779 call_addr = caller_nm->call_instruction_address(pc); 1780 } 1781 // Make sure nmethod doesn't get deoptimized and removed until 1782 // this is done with it. 1783 // CLEANUP - with lazy deopt shouldn't need this lock 1784 nmethodLocker nmlock(caller_nm); 1785 1786 if (call_addr != NULL) { 1787 RelocIterator iter(caller_nm, call_addr, call_addr+1); 1788 int ret = iter.next(); // Get item 1789 if (ret) { 1790 assert(iter.addr() == call_addr, "must find call"); 1791 if (iter.type() == relocInfo::static_call_type) { 1792 is_static_call = true; 1793 } else { 1794 assert(iter.type() == relocInfo::virtual_call_type || 1795 iter.type() == relocInfo::opt_virtual_call_type 1796 , "unexpected relocInfo. type"); 1797 } 1798 } else { 1799 assert(!UseInlineCaches, "relocation info. must exist for this address"); 1800 } 1801 1802 // Cleaning the inline cache will force a new resolve. This is more robust 1803 // than directly setting it to the new destination, since resolving of calls 1804 // is always done through the same code path. (experience shows that it 1805 // leads to very hard to track down bugs, if an inline cache gets updated 1806 // to a wrong method). It should not be performance critical, since the 1807 // resolve is only done once. 1808 1809 for (;;) { 1810 ICRefillVerifier ic_refill_verifier; 1811 if (!clear_ic_at_addr(caller_nm, call_addr, is_static_call)) { 1812 InlineCacheBuffer::refill_ic_stubs(); 1813 } else { 1814 break; 1815 } 1816 } 1817 } 1818 } 1819 1820 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle())); 1821 1822 1823 #ifndef PRODUCT 1824 Atomic::inc(&_wrong_method_ctr); 1825 1826 if (TraceCallFixup) { 1827 ResourceMark rm(thread); 1828 tty->print("handle_wrong_method reresolving call to"); 1829 callee_method->print_short_name(tty); 1830 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1831 } 1832 #endif 1833 1834 return callee_method; 1835 } 1836 1837 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) { 1838 // The faulting unsafe accesses should be changed to throw the error 1839 // synchronously instead. Meanwhile the faulting instruction will be 1840 // skipped over (effectively turning it into a no-op) and an 1841 // asynchronous exception will be raised which the thread will 1842 // handle at a later point. If the instruction is a load it will 1843 // return garbage. 1844 1845 // Request an async exception. 1846 thread->set_pending_unsafe_access_error(); 1847 1848 // Return address of next instruction to execute. 1849 return next_pc; 1850 } 1851 1852 #ifdef ASSERT 1853 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method, 1854 const BasicType* sig_bt, 1855 const VMRegPair* regs) { 1856 ResourceMark rm; 1857 const int total_args_passed = method->size_of_parameters(); 1858 const VMRegPair* regs_with_member_name = regs; 1859 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1); 1860 1861 const int member_arg_pos = total_args_passed - 1; 1862 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob"); 1863 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object"); 1864 1865 const bool is_outgoing = method->is_method_handle_intrinsic(); 1866 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing); 1867 1868 for (int i = 0; i < member_arg_pos; i++) { 1869 VMReg a = regs_with_member_name[i].first(); 1870 VMReg b = regs_without_member_name[i].first(); 1871 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value()); 1872 } 1873 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg"); 1874 } 1875 #endif 1876 1877 bool SharedRuntime::should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb) { 1878 if (destination != entry_point) { 1879 CodeBlob* callee = CodeCache::find_blob(destination); 1880 // callee == cb seems weird. It means calling interpreter thru stub. 1881 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) { 1882 // static call or optimized virtual 1883 if (TraceCallFixup) { 1884 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1885 moop->print_short_name(tty); 1886 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1887 } 1888 return true; 1889 } else { 1890 if (TraceCallFixup) { 1891 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1892 moop->print_short_name(tty); 1893 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1894 } 1895 // assert is too strong could also be resolve destinations. 1896 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be"); 1897 } 1898 } else { 1899 if (TraceCallFixup) { 1900 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1901 moop->print_short_name(tty); 1902 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1903 } 1904 } 1905 return false; 1906 } 1907 1908 // --------------------------------------------------------------------------- 1909 // We are calling the interpreter via a c2i. Normally this would mean that 1910 // we were called by a compiled method. However we could have lost a race 1911 // where we went int -> i2c -> c2i and so the caller could in fact be 1912 // interpreted. If the caller is compiled we attempt to patch the caller 1913 // so he no longer calls into the interpreter. 1914 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc)) 1915 Method* moop(method); 1916 1917 address entry_point = moop->from_compiled_entry_no_trampoline(); 1918 1919 // It's possible that deoptimization can occur at a call site which hasn't 1920 // been resolved yet, in which case this function will be called from 1921 // an nmethod that has been patched for deopt and we can ignore the 1922 // request for a fixup. 1923 // Also it is possible that we lost a race in that from_compiled_entry 1924 // is now back to the i2c in that case we don't need to patch and if 1925 // we did we'd leap into space because the callsite needs to use 1926 // "to interpreter" stub in order to load up the Method*. Don't 1927 // ask me how I know this... 1928 1929 CodeBlob* cb = CodeCache::find_blob(caller_pc); 1930 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) { 1931 return; 1932 } 1933 1934 // The check above makes sure this is a nmethod. 1935 CompiledMethod* nm = cb->as_compiled_method_or_null(); 1936 assert(nm, "must be"); 1937 1938 // Get the return PC for the passed caller PC. 1939 address return_pc = caller_pc + frame::pc_return_offset; 1940 1941 // There is a benign race here. We could be attempting to patch to a compiled 1942 // entry point at the same time the callee is being deoptimized. If that is 1943 // the case then entry_point may in fact point to a c2i and we'd patch the 1944 // call site with the same old data. clear_code will set code() to NULL 1945 // at the end of it. If we happen to see that NULL then we can skip trying 1946 // to patch. If we hit the window where the callee has a c2i in the 1947 // from_compiled_entry and the NULL isn't present yet then we lose the race 1948 // and patch the code with the same old data. Asi es la vida. 1949 1950 if (moop->code() == NULL) return; 1951 1952 if (nm->is_in_use()) { 1953 // Expect to find a native call there (unless it was no-inline cache vtable dispatch) 1954 CompiledICLocker ic_locker(nm); 1955 if (NativeCall::is_call_before(return_pc)) { 1956 ResourceMark mark; 1957 NativeCallWrapper* call = nm->call_wrapper_before(return_pc); 1958 // 1959 // bug 6281185. We might get here after resolving a call site to a vanilla 1960 // virtual call. Because the resolvee uses the verified entry it may then 1961 // see compiled code and attempt to patch the site by calling us. This would 1962 // then incorrectly convert the call site to optimized and its downhill from 1963 // there. If you're lucky you'll get the assert in the bugid, if not you've 1964 // just made a call site that could be megamorphic into a monomorphic site 1965 // for the rest of its life! Just another racing bug in the life of 1966 // fixup_callers_callsite ... 1967 // 1968 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address()); 1969 iter.next(); 1970 assert(iter.has_current(), "must have a reloc at java call site"); 1971 relocInfo::relocType typ = iter.reloc()->type(); 1972 if (typ != relocInfo::static_call_type && 1973 typ != relocInfo::opt_virtual_call_type && 1974 typ != relocInfo::static_stub_type) { 1975 return; 1976 } 1977 address destination = call->destination(); 1978 if (should_fixup_call_destination(destination, entry_point, caller_pc, moop, cb)) { 1979 call->set_destination_mt_safe(entry_point); 1980 } 1981 } 1982 } 1983 JRT_END 1984 1985 1986 // same as JVM_Arraycopy, but called directly from compiled code 1987 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos, 1988 oopDesc* dest, jint dest_pos, 1989 jint length, 1990 JavaThread* thread)) { 1991 #ifndef PRODUCT 1992 _slow_array_copy_ctr++; 1993 #endif 1994 // Check if we have null pointers 1995 if (src == NULL || dest == NULL) { 1996 THROW(vmSymbols::java_lang_NullPointerException()); 1997 } 1998 // Do the copy. The casts to arrayOop are necessary to the copy_array API, 1999 // even though the copy_array API also performs dynamic checks to ensure 2000 // that src and dest are truly arrays (and are conformable). 2001 // The copy_array mechanism is awkward and could be removed, but 2002 // the compilers don't call this function except as a last resort, 2003 // so it probably doesn't matter. 2004 src->klass()->copy_array((arrayOopDesc*)src, src_pos, 2005 (arrayOopDesc*)dest, dest_pos, 2006 length, thread); 2007 } 2008 JRT_END 2009 2010 // The caller of generate_class_cast_message() (or one of its callers) 2011 // must use a ResourceMark in order to correctly free the result. 2012 char* SharedRuntime::generate_class_cast_message( 2013 JavaThread* thread, Klass* caster_klass) { 2014 2015 // Get target class name from the checkcast instruction 2016 vframeStream vfst(thread, true); 2017 assert(!vfst.at_end(), "Java frame must exist"); 2018 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci())); 2019 constantPoolHandle cpool(thread, vfst.method()->constants()); 2020 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index()); 2021 Symbol* target_klass_name = NULL; 2022 if (target_klass == NULL) { 2023 // This klass should be resolved, but just in case, get the name in the klass slot. 2024 target_klass_name = cpool->klass_name_at(cc.index()); 2025 } 2026 return generate_class_cast_message(caster_klass, target_klass, target_klass_name); 2027 } 2028 2029 2030 // The caller of generate_class_cast_message() (or one of its callers) 2031 // must use a ResourceMark in order to correctly free the result. 2032 char* SharedRuntime::generate_class_cast_message( 2033 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) { 2034 const char* caster_name = caster_klass->external_name(); 2035 2036 assert(target_klass != NULL || target_klass_name != NULL, "one must be provided"); 2037 const char* target_name = target_klass == NULL ? target_klass_name->as_klass_external_name() : 2038 target_klass->external_name(); 2039 2040 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1; 2041 2042 const char* caster_klass_description = ""; 2043 const char* target_klass_description = ""; 2044 const char* klass_separator = ""; 2045 if (target_klass != NULL && caster_klass->module() == target_klass->module()) { 2046 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass); 2047 } else { 2048 caster_klass_description = caster_klass->class_in_module_of_loader(); 2049 target_klass_description = (target_klass != NULL) ? target_klass->class_in_module_of_loader() : ""; 2050 klass_separator = (target_klass != NULL) ? "; " : ""; 2051 } 2052 2053 // add 3 for parenthesis and preceeding space 2054 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3; 2055 2056 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen); 2057 if (message == NULL) { 2058 // Shouldn't happen, but don't cause even more problems if it does 2059 message = const_cast<char*>(caster_klass->external_name()); 2060 } else { 2061 jio_snprintf(message, 2062 msglen, 2063 "class %s cannot be cast to class %s (%s%s%s)", 2064 caster_name, 2065 target_name, 2066 caster_klass_description, 2067 klass_separator, 2068 target_klass_description 2069 ); 2070 } 2071 return message; 2072 } 2073 2074 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages()) 2075 (void) JavaThread::current()->reguard_stack(); 2076 JRT_END 2077 2078 2079 // Handles the uncommon case in locking, i.e., contention or an inflated lock. 2080 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread)) 2081 if (!SafepointSynchronize::is_synchronizing()) { 2082 // Only try quick_enter() if we're not trying to reach a safepoint 2083 // so that the calling thread reaches the safepoint more quickly. 2084 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return; 2085 } 2086 // NO_ASYNC required because an async exception on the state transition destructor 2087 // would leave you with the lock held and it would never be released. 2088 // The normal monitorenter NullPointerException is thrown without acquiring a lock 2089 // and the model is that an exception implies the method failed. 2090 JRT_BLOCK_NO_ASYNC 2091 oop obj(_obj); 2092 if (PrintBiasedLockingStatistics) { 2093 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 2094 } 2095 Handle h_obj(THREAD, obj); 2096 ObjectSynchronizer::enter(h_obj, lock, CHECK); 2097 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here"); 2098 JRT_BLOCK_END 2099 JRT_END 2100 2101 // Handles the uncommon cases of monitor unlocking in compiled code 2102 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD)) 2103 oop obj(_obj); 2104 assert(JavaThread::current() == THREAD, "invariant"); 2105 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore 2106 // testing was unable to ever fire the assert that guarded it so I have removed it. 2107 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?"); 2108 #undef MIGHT_HAVE_PENDING 2109 #ifdef MIGHT_HAVE_PENDING 2110 // Save and restore any pending_exception around the exception mark. 2111 // While the slow_exit must not throw an exception, we could come into 2112 // this routine with one set. 2113 oop pending_excep = NULL; 2114 const char* pending_file; 2115 int pending_line; 2116 if (HAS_PENDING_EXCEPTION) { 2117 pending_excep = PENDING_EXCEPTION; 2118 pending_file = THREAD->exception_file(); 2119 pending_line = THREAD->exception_line(); 2120 CLEAR_PENDING_EXCEPTION; 2121 } 2122 #endif /* MIGHT_HAVE_PENDING */ 2123 2124 { 2125 // Exit must be non-blocking, and therefore no exceptions can be thrown. 2126 EXCEPTION_MARK; 2127 ObjectSynchronizer::exit(obj, lock, THREAD); 2128 } 2129 2130 #ifdef MIGHT_HAVE_PENDING 2131 if (pending_excep != NULL) { 2132 THREAD->set_pending_exception(pending_excep, pending_file, pending_line); 2133 } 2134 #endif /* MIGHT_HAVE_PENDING */ 2135 JRT_END 2136 2137 #ifndef PRODUCT 2138 2139 void SharedRuntime::print_statistics() { 2140 ttyLocker ttyl; 2141 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'"); 2142 2143 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr); 2144 2145 SharedRuntime::print_ic_miss_histogram(); 2146 2147 if (CountRemovableExceptions) { 2148 if (_nof_removable_exceptions > 0) { 2149 Unimplemented(); // this counter is not yet incremented 2150 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions); 2151 } 2152 } 2153 2154 // Dump the JRT_ENTRY counters 2155 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr); 2156 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr); 2157 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr); 2158 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr); 2159 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr); 2160 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr); 2161 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr); 2162 2163 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr); 2164 tty->print_cr("%5d wrong method", _wrong_method_ctr); 2165 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr); 2166 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr); 2167 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr); 2168 2169 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr); 2170 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr); 2171 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr); 2172 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr); 2173 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr); 2174 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr); 2175 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr); 2176 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr); 2177 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr); 2178 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr); 2179 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr); 2180 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr); 2181 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr); 2182 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr); 2183 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr); 2184 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr); 2185 2186 AdapterHandlerLibrary::print_statistics(); 2187 2188 if (xtty != NULL) xtty->tail("statistics"); 2189 } 2190 2191 inline double percent(int x, int y) { 2192 return 100.0 * x / MAX2(y, 1); 2193 } 2194 2195 class MethodArityHistogram { 2196 public: 2197 enum { MAX_ARITY = 256 }; 2198 private: 2199 static int _arity_histogram[MAX_ARITY]; // histogram of #args 2200 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words 2201 static int _max_arity; // max. arity seen 2202 static int _max_size; // max. arg size seen 2203 2204 static void add_method_to_histogram(nmethod* nm) { 2205 if (CompiledMethod::nmethod_access_is_safe(nm)) { 2206 Method* method = nm->method(); 2207 ArgumentCount args(method->signature()); 2208 int arity = args.size() + (method->is_static() ? 0 : 1); 2209 int argsize = method->size_of_parameters(); 2210 arity = MIN2(arity, MAX_ARITY-1); 2211 argsize = MIN2(argsize, MAX_ARITY-1); 2212 int count = method->compiled_invocation_count(); 2213 _arity_histogram[arity] += count; 2214 _size_histogram[argsize] += count; 2215 _max_arity = MAX2(_max_arity, arity); 2216 _max_size = MAX2(_max_size, argsize); 2217 } 2218 } 2219 2220 void print_histogram_helper(int n, int* histo, const char* name) { 2221 const int N = MIN2(5, n); 2222 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 2223 double sum = 0; 2224 double weighted_sum = 0; 2225 int i; 2226 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; } 2227 double rest = sum; 2228 double percent = sum / 100; 2229 for (i = 0; i <= N; i++) { 2230 rest -= histo[i]; 2231 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent); 2232 } 2233 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent); 2234 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n); 2235 } 2236 2237 void print_histogram() { 2238 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 2239 print_histogram_helper(_max_arity, _arity_histogram, "arity"); 2240 tty->print_cr("\nSame for parameter size (in words):"); 2241 print_histogram_helper(_max_size, _size_histogram, "size"); 2242 tty->cr(); 2243 } 2244 2245 public: 2246 MethodArityHistogram() { 2247 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2248 _max_arity = _max_size = 0; 2249 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0; 2250 CodeCache::nmethods_do(add_method_to_histogram); 2251 print_histogram(); 2252 } 2253 }; 2254 2255 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY]; 2256 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY]; 2257 int MethodArityHistogram::_max_arity; 2258 int MethodArityHistogram::_max_size; 2259 2260 void SharedRuntime::print_call_statistics(int comp_total) { 2261 tty->print_cr("Calls from compiled code:"); 2262 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls; 2263 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls; 2264 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls; 2265 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total)); 2266 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total)); 2267 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls)); 2268 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls)); 2269 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls)); 2270 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls)); 2271 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total)); 2272 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls)); 2273 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls)); 2274 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls)); 2275 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls)); 2276 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total)); 2277 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls)); 2278 tty->cr(); 2279 tty->print_cr("Note 1: counter updates are not MT-safe."); 2280 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;"); 2281 tty->print_cr(" %% in nested categories are relative to their category"); 2282 tty->print_cr(" (and thus add up to more than 100%% with inlining)"); 2283 tty->cr(); 2284 2285 MethodArityHistogram h; 2286 } 2287 #endif 2288 2289 2290 // A simple wrapper class around the calling convention information 2291 // that allows sharing of adapters for the same calling convention. 2292 class AdapterFingerPrint : public CHeapObj<mtCode> { 2293 private: 2294 enum { 2295 _basic_type_bits = 4, 2296 _basic_type_mask = right_n_bits(_basic_type_bits), 2297 _basic_types_per_int = BitsPerInt / _basic_type_bits, 2298 _compact_int_count = 3 2299 }; 2300 // TO DO: Consider integrating this with a more global scheme for compressing signatures. 2301 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive. 2302 2303 union { 2304 int _compact[_compact_int_count]; 2305 int* _fingerprint; 2306 } _value; 2307 int _length; // A negative length indicates the fingerprint is in the compact form, 2308 // Otherwise _value._fingerprint is the array. 2309 2310 // Remap BasicTypes that are handled equivalently by the adapters. 2311 // These are correct for the current system but someday it might be 2312 // necessary to make this mapping platform dependent. 2313 static int adapter_encoding(BasicType in) { 2314 switch (in) { 2315 case T_BOOLEAN: 2316 case T_BYTE: 2317 case T_SHORT: 2318 case T_CHAR: 2319 // There are all promoted to T_INT in the calling convention 2320 return T_INT; 2321 2322 case T_OBJECT: 2323 case T_ARRAY: 2324 // In other words, we assume that any register good enough for 2325 // an int or long is good enough for a managed pointer. 2326 #ifdef _LP64 2327 return T_LONG; 2328 #else 2329 return T_INT; 2330 #endif 2331 2332 case T_INT: 2333 case T_LONG: 2334 case T_FLOAT: 2335 case T_DOUBLE: 2336 case T_VOID: 2337 return in; 2338 2339 default: 2340 ShouldNotReachHere(); 2341 return T_CONFLICT; 2342 } 2343 } 2344 2345 public: 2346 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) { 2347 // The fingerprint is based on the BasicType signature encoded 2348 // into an array of ints with eight entries per int. 2349 int* ptr; 2350 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int; 2351 if (len <= _compact_int_count) { 2352 assert(_compact_int_count == 3, "else change next line"); 2353 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0; 2354 // Storing the signature encoded as signed chars hits about 98% 2355 // of the time. 2356 _length = -len; 2357 ptr = _value._compact; 2358 } else { 2359 _length = len; 2360 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode); 2361 ptr = _value._fingerprint; 2362 } 2363 2364 // Now pack the BasicTypes with 8 per int 2365 int sig_index = 0; 2366 for (int index = 0; index < len; index++) { 2367 int value = 0; 2368 for (int byte = 0; byte < _basic_types_per_int; byte++) { 2369 int bt = ((sig_index < total_args_passed) 2370 ? adapter_encoding(sig_bt[sig_index++]) 2371 : 0); 2372 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits"); 2373 value = (value << _basic_type_bits) | bt; 2374 } 2375 ptr[index] = value; 2376 } 2377 } 2378 2379 ~AdapterFingerPrint() { 2380 if (_length > 0) { 2381 FREE_C_HEAP_ARRAY(int, _value._fingerprint); 2382 } 2383 } 2384 2385 int value(int index) { 2386 if (_length < 0) { 2387 return _value._compact[index]; 2388 } 2389 return _value._fingerprint[index]; 2390 } 2391 int length() { 2392 if (_length < 0) return -_length; 2393 return _length; 2394 } 2395 2396 bool is_compact() { 2397 return _length <= 0; 2398 } 2399 2400 unsigned int compute_hash() { 2401 int hash = 0; 2402 for (int i = 0; i < length(); i++) { 2403 int v = value(i); 2404 hash = (hash << 8) ^ v ^ (hash >> 5); 2405 } 2406 return (unsigned int)hash; 2407 } 2408 2409 const char* as_string() { 2410 stringStream st; 2411 st.print("0x"); 2412 for (int i = 0; i < length(); i++) { 2413 st.print("%08x", value(i)); 2414 } 2415 return st.as_string(); 2416 } 2417 2418 bool equals(AdapterFingerPrint* other) { 2419 if (other->_length != _length) { 2420 return false; 2421 } 2422 if (_length < 0) { 2423 assert(_compact_int_count == 3, "else change next line"); 2424 return _value._compact[0] == other->_value._compact[0] && 2425 _value._compact[1] == other->_value._compact[1] && 2426 _value._compact[2] == other->_value._compact[2]; 2427 } else { 2428 for (int i = 0; i < _length; i++) { 2429 if (_value._fingerprint[i] != other->_value._fingerprint[i]) { 2430 return false; 2431 } 2432 } 2433 } 2434 return true; 2435 } 2436 }; 2437 2438 2439 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries 2440 class AdapterHandlerTable : public BasicHashtable<mtCode> { 2441 friend class AdapterHandlerTableIterator; 2442 2443 private: 2444 2445 #ifndef PRODUCT 2446 static int _lookups; // number of calls to lookup 2447 static int _buckets; // number of buckets checked 2448 static int _equals; // number of buckets checked with matching hash 2449 static int _hits; // number of successful lookups 2450 static int _compact; // number of equals calls with compact signature 2451 #endif 2452 2453 AdapterHandlerEntry* bucket(int i) { 2454 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i); 2455 } 2456 2457 public: 2458 AdapterHandlerTable() 2459 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { } 2460 2461 // Create a new entry suitable for insertion in the table 2462 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry) { 2463 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash()); 2464 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry); 2465 if (DumpSharedSpaces) { 2466 ((CDSAdapterHandlerEntry*)entry)->init(); 2467 } 2468 return entry; 2469 } 2470 2471 // Insert an entry into the table 2472 void add(AdapterHandlerEntry* entry) { 2473 int index = hash_to_index(entry->hash()); 2474 add_entry(index, entry); 2475 } 2476 2477 void free_entry(AdapterHandlerEntry* entry) { 2478 entry->deallocate(); 2479 BasicHashtable<mtCode>::free_entry(entry); 2480 } 2481 2482 // Find a entry with the same fingerprint if it exists 2483 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) { 2484 NOT_PRODUCT(_lookups++); 2485 AdapterFingerPrint fp(total_args_passed, sig_bt); 2486 unsigned int hash = fp.compute_hash(); 2487 int index = hash_to_index(hash); 2488 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2489 NOT_PRODUCT(_buckets++); 2490 if (e->hash() == hash) { 2491 NOT_PRODUCT(_equals++); 2492 if (fp.equals(e->fingerprint())) { 2493 #ifndef PRODUCT 2494 if (fp.is_compact()) _compact++; 2495 _hits++; 2496 #endif 2497 return e; 2498 } 2499 } 2500 } 2501 return NULL; 2502 } 2503 2504 #ifndef PRODUCT 2505 void print_statistics() { 2506 ResourceMark rm; 2507 int longest = 0; 2508 int empty = 0; 2509 int total = 0; 2510 int nonempty = 0; 2511 for (int index = 0; index < table_size(); index++) { 2512 int count = 0; 2513 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2514 count++; 2515 } 2516 if (count != 0) nonempty++; 2517 if (count == 0) empty++; 2518 if (count > longest) longest = count; 2519 total += count; 2520 } 2521 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f", 2522 empty, longest, total, total / (double)nonempty); 2523 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d", 2524 _lookups, _buckets, _equals, _hits, _compact); 2525 } 2526 #endif 2527 }; 2528 2529 2530 #ifndef PRODUCT 2531 2532 int AdapterHandlerTable::_lookups; 2533 int AdapterHandlerTable::_buckets; 2534 int AdapterHandlerTable::_equals; 2535 int AdapterHandlerTable::_hits; 2536 int AdapterHandlerTable::_compact; 2537 2538 #endif 2539 2540 class AdapterHandlerTableIterator : public StackObj { 2541 private: 2542 AdapterHandlerTable* _table; 2543 int _index; 2544 AdapterHandlerEntry* _current; 2545 2546 void scan() { 2547 while (_index < _table->table_size()) { 2548 AdapterHandlerEntry* a = _table->bucket(_index); 2549 _index++; 2550 if (a != NULL) { 2551 _current = a; 2552 return; 2553 } 2554 } 2555 } 2556 2557 public: 2558 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) { 2559 scan(); 2560 } 2561 bool has_next() { 2562 return _current != NULL; 2563 } 2564 AdapterHandlerEntry* next() { 2565 if (_current != NULL) { 2566 AdapterHandlerEntry* result = _current; 2567 _current = _current->next(); 2568 if (_current == NULL) scan(); 2569 return result; 2570 } else { 2571 return NULL; 2572 } 2573 } 2574 }; 2575 2576 2577 // --------------------------------------------------------------------------- 2578 // Implementation of AdapterHandlerLibrary 2579 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL; 2580 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL; 2581 const int AdapterHandlerLibrary_size = 16*K; 2582 BufferBlob* AdapterHandlerLibrary::_buffer = NULL; 2583 2584 BufferBlob* AdapterHandlerLibrary::buffer_blob() { 2585 // Should be called only when AdapterHandlerLibrary_lock is active. 2586 if (_buffer == NULL) // Initialize lazily 2587 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size); 2588 return _buffer; 2589 } 2590 2591 extern "C" void unexpected_adapter_call() { 2592 ShouldNotCallThis(); 2593 } 2594 2595 void AdapterHandlerLibrary::initialize() { 2596 if (_adapters != NULL) return; 2597 _adapters = new AdapterHandlerTable(); 2598 2599 // Create a special handler for abstract methods. Abstract methods 2600 // are never compiled so an i2c entry is somewhat meaningless, but 2601 // throw AbstractMethodError just in case. 2602 // Pass wrong_method_abstract for the c2i transitions to return 2603 // AbstractMethodError for invalid invocations. 2604 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub(); 2605 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL), 2606 StubRoutines::throw_AbstractMethodError_entry(), 2607 wrong_method_abstract, wrong_method_abstract); 2608 } 2609 2610 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint, 2611 address i2c_entry, 2612 address c2i_entry, 2613 address c2i_unverified_entry, 2614 address c2i_no_clinit_check_entry) { 2615 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry); 2616 } 2617 2618 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) { 2619 AdapterHandlerEntry* entry = get_adapter0(method); 2620 if (method->is_shared()) { 2621 // See comments around Method::link_method() 2622 MutexLocker mu(AdapterHandlerLibrary_lock); 2623 if (method->adapter() == NULL) { 2624 method->update_adapter_trampoline(entry); 2625 } 2626 address trampoline = method->from_compiled_entry(); 2627 if (*(int*)trampoline == 0) { 2628 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size()); 2629 MacroAssembler _masm(&buffer); 2630 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry()); 2631 assert(*(int*)trampoline != 0, "Instruction(s) for trampoline must not be encoded as zeros."); 2632 2633 if (PrintInterpreter) { 2634 Disassembler::decode(buffer.insts_begin(), buffer.insts_end()); 2635 } 2636 } 2637 } 2638 2639 return entry; 2640 } 2641 2642 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) { 2643 // Use customized signature handler. Need to lock around updates to 2644 // the AdapterHandlerTable (it is not safe for concurrent readers 2645 // and a single writer: this could be fixed if it becomes a 2646 // problem). 2647 2648 ResourceMark rm; 2649 2650 NOT_PRODUCT(int insts_size); 2651 AdapterBlob* new_adapter = NULL; 2652 AdapterHandlerEntry* entry = NULL; 2653 AdapterFingerPrint* fingerprint = NULL; 2654 { 2655 MutexLocker mu(AdapterHandlerLibrary_lock); 2656 // make sure data structure is initialized 2657 initialize(); 2658 2659 if (method->is_abstract()) { 2660 return _abstract_method_handler; 2661 } 2662 2663 // Fill in the signature array, for the calling-convention call. 2664 int total_args_passed = method->size_of_parameters(); // All args on stack 2665 2666 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2667 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2668 int i = 0; 2669 if (!method->is_static()) // Pass in receiver first 2670 sig_bt[i++] = T_OBJECT; 2671 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) { 2672 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2673 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2674 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2675 } 2676 assert(i == total_args_passed, ""); 2677 2678 // Lookup method signature's fingerprint 2679 entry = _adapters->lookup(total_args_passed, sig_bt); 2680 2681 #ifdef ASSERT 2682 AdapterHandlerEntry* shared_entry = NULL; 2683 // Start adapter sharing verification only after the VM is booted. 2684 if (VerifyAdapterSharing && (entry != NULL)) { 2685 shared_entry = entry; 2686 entry = NULL; 2687 } 2688 #endif 2689 2690 if (entry != NULL) { 2691 return entry; 2692 } 2693 2694 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage 2695 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); 2696 2697 // Make a C heap allocated version of the fingerprint to store in the adapter 2698 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt); 2699 2700 // StubRoutines::code2() is initialized after this function can be called. As a result, 2701 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated 2702 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C 2703 // stub that ensure that an I2C stub is called from an interpreter frame. 2704 bool contains_all_checks = StubRoutines::code2() != NULL; 2705 2706 // Create I2C & C2I handlers 2707 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2708 if (buf != NULL) { 2709 CodeBuffer buffer(buf); 2710 short buffer_locs[20]; 2711 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs, 2712 sizeof(buffer_locs)/sizeof(relocInfo)); 2713 2714 MacroAssembler _masm(&buffer); 2715 entry = SharedRuntime::generate_i2c2i_adapters(&_masm, 2716 total_args_passed, 2717 comp_args_on_stack, 2718 sig_bt, 2719 regs, 2720 fingerprint); 2721 #ifdef ASSERT 2722 if (VerifyAdapterSharing) { 2723 if (shared_entry != NULL) { 2724 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match"); 2725 // Release the one just created and return the original 2726 _adapters->free_entry(entry); 2727 return shared_entry; 2728 } else { 2729 entry->save_code(buf->code_begin(), buffer.insts_size()); 2730 } 2731 } 2732 #endif 2733 2734 new_adapter = AdapterBlob::create(&buffer); 2735 NOT_PRODUCT(insts_size = buffer.insts_size()); 2736 } 2737 if (new_adapter == NULL) { 2738 // CodeCache is full, disable compilation 2739 // Ought to log this but compile log is only per compile thread 2740 // and we're some non descript Java thread. 2741 return NULL; // Out of CodeCache space 2742 } 2743 entry->relocate(new_adapter->content_begin()); 2744 #ifndef PRODUCT 2745 // debugging suppport 2746 if (PrintAdapterHandlers || PrintStubCode) { 2747 ttyLocker ttyl; 2748 entry->print_adapter_on(tty); 2749 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)", 2750 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"), 2751 method->signature()->as_C_string(), fingerprint->as_string(), insts_size); 2752 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry()); 2753 if (Verbose || PrintStubCode) { 2754 address first_pc = entry->base_address(); 2755 if (first_pc != NULL) { 2756 Disassembler::decode(first_pc, first_pc + insts_size); 2757 tty->cr(); 2758 } 2759 } 2760 } 2761 #endif 2762 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp) 2763 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified. 2764 if (contains_all_checks || !VerifyAdapterCalls) { 2765 _adapters->add(entry); 2766 } 2767 } 2768 // Outside of the lock 2769 if (new_adapter != NULL) { 2770 char blob_id[256]; 2771 jio_snprintf(blob_id, 2772 sizeof(blob_id), 2773 "%s(%s)@" PTR_FORMAT, 2774 new_adapter->name(), 2775 fingerprint->as_string(), 2776 new_adapter->content_begin()); 2777 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end()); 2778 2779 if (JvmtiExport::should_post_dynamic_code_generated()) { 2780 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end()); 2781 } 2782 } 2783 return entry; 2784 } 2785 2786 address AdapterHandlerEntry::base_address() { 2787 address base = _i2c_entry; 2788 if (base == NULL) base = _c2i_entry; 2789 assert(base <= _c2i_entry || _c2i_entry == NULL, ""); 2790 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, ""); 2791 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == NULL, ""); 2792 return base; 2793 } 2794 2795 void AdapterHandlerEntry::relocate(address new_base) { 2796 address old_base = base_address(); 2797 assert(old_base != NULL, ""); 2798 ptrdiff_t delta = new_base - old_base; 2799 if (_i2c_entry != NULL) 2800 _i2c_entry += delta; 2801 if (_c2i_entry != NULL) 2802 _c2i_entry += delta; 2803 if (_c2i_unverified_entry != NULL) 2804 _c2i_unverified_entry += delta; 2805 if (_c2i_no_clinit_check_entry != NULL) 2806 _c2i_no_clinit_check_entry += delta; 2807 assert(base_address() == new_base, ""); 2808 } 2809 2810 2811 void AdapterHandlerEntry::deallocate() { 2812 delete _fingerprint; 2813 #ifdef ASSERT 2814 FREE_C_HEAP_ARRAY(unsigned char, _saved_code); 2815 #endif 2816 } 2817 2818 2819 #ifdef ASSERT 2820 // Capture the code before relocation so that it can be compared 2821 // against other versions. If the code is captured after relocation 2822 // then relative instructions won't be equivalent. 2823 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) { 2824 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode); 2825 _saved_code_length = length; 2826 memcpy(_saved_code, buffer, length); 2827 } 2828 2829 2830 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) { 2831 if (length != _saved_code_length) { 2832 return false; 2833 } 2834 2835 return (memcmp(buffer, _saved_code, length) == 0) ? true : false; 2836 } 2837 #endif 2838 2839 2840 /** 2841 * Create a native wrapper for this native method. The wrapper converts the 2842 * Java-compiled calling convention to the native convention, handles 2843 * arguments, and transitions to native. On return from the native we transition 2844 * back to java blocking if a safepoint is in progress. 2845 */ 2846 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) { 2847 ResourceMark rm; 2848 nmethod* nm = NULL; 2849 address critical_entry = NULL; 2850 2851 assert(method->is_native(), "must be native"); 2852 assert(method->is_method_handle_intrinsic() || 2853 method->has_native_function(), "must have something valid to call!"); 2854 2855 if (CriticalJNINatives && !method->is_method_handle_intrinsic()) { 2856 // We perform the I/O with transition to native before acquiring AdapterHandlerLibrary_lock. 2857 critical_entry = NativeLookup::lookup_critical_entry(method); 2858 } 2859 2860 { 2861 // Perform the work while holding the lock, but perform any printing outside the lock 2862 MutexLocker mu(AdapterHandlerLibrary_lock); 2863 // See if somebody beat us to it 2864 if (method->code() != NULL) { 2865 return; 2866 } 2867 2868 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci); 2869 assert(compile_id > 0, "Must generate native wrapper"); 2870 2871 2872 ResourceMark rm; 2873 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2874 if (buf != NULL) { 2875 CodeBuffer buffer(buf); 2876 double locs_buf[20]; 2877 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); 2878 MacroAssembler _masm(&buffer); 2879 2880 // Fill in the signature array, for the calling-convention call. 2881 const int total_args_passed = method->size_of_parameters(); 2882 2883 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2884 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2885 int i=0; 2886 if (!method->is_static()) // Pass in receiver first 2887 sig_bt[i++] = T_OBJECT; 2888 SignatureStream ss(method->signature()); 2889 for (; !ss.at_return_type(); ss.next()) { 2890 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2891 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2892 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2893 } 2894 assert(i == total_args_passed, ""); 2895 BasicType ret_type = ss.type(); 2896 2897 // Now get the compiled-Java layout as input (or output) arguments. 2898 // NOTE: Stubs for compiled entry points of method handle intrinsics 2899 // are just trampolines so the argument registers must be outgoing ones. 2900 const bool is_outgoing = method->is_method_handle_intrinsic(); 2901 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing); 2902 2903 // Generate the compiled-to-native wrapper code 2904 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type, critical_entry); 2905 2906 if (nm != NULL) { 2907 { 2908 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 2909 if (nm->make_in_use()) { 2910 method->set_code(method, nm); 2911 } 2912 } 2913 2914 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple)); 2915 if (directive->PrintAssemblyOption) { 2916 nm->print_code(); 2917 } 2918 DirectivesStack::release(directive); 2919 } 2920 } 2921 } // Unlock AdapterHandlerLibrary_lock 2922 2923 2924 // Install the generated code. 2925 if (nm != NULL) { 2926 const char *msg = method->is_static() ? "(static)" : ""; 2927 CompileTask::print_ul(nm, msg); 2928 if (PrintCompilation) { 2929 ttyLocker ttyl; 2930 CompileTask::print(tty, nm, msg); 2931 } 2932 nm->post_compiled_method_load_event(); 2933 } 2934 } 2935 2936 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread)) 2937 assert(thread == JavaThread::current(), "must be"); 2938 // The code is about to enter a JNI lazy critical native method and 2939 // _needs_gc is true, so if this thread is already in a critical 2940 // section then just return, otherwise this thread should block 2941 // until needs_gc has been cleared. 2942 if (thread->in_critical()) { 2943 return; 2944 } 2945 // Lock and unlock a critical section to give the system a chance to block 2946 GCLocker::lock_critical(thread); 2947 GCLocker::unlock_critical(thread); 2948 JRT_END 2949 2950 JRT_LEAF(oopDesc*, SharedRuntime::pin_object(JavaThread* thread, oopDesc* obj)) 2951 assert(Universe::heap()->supports_object_pinning(), "Why we are here?"); 2952 assert(obj != NULL, "Should not be null"); 2953 oop o(obj); 2954 o = Universe::heap()->pin_object(thread, o); 2955 assert(o != NULL, "Should not be null"); 2956 return o; 2957 JRT_END 2958 2959 JRT_LEAF(void, SharedRuntime::unpin_object(JavaThread* thread, oopDesc* obj)) 2960 assert(Universe::heap()->supports_object_pinning(), "Why we are here?"); 2961 assert(obj != NULL, "Should not be null"); 2962 oop o(obj); 2963 Universe::heap()->unpin_object(thread, o); 2964 JRT_END 2965 2966 // ------------------------------------------------------------------------- 2967 // Java-Java calling convention 2968 // (what you use when Java calls Java) 2969 2970 //------------------------------name_for_receiver---------------------------------- 2971 // For a given signature, return the VMReg for parameter 0. 2972 VMReg SharedRuntime::name_for_receiver() { 2973 VMRegPair regs; 2974 BasicType sig_bt = T_OBJECT; 2975 (void) java_calling_convention(&sig_bt, ®s, 1, true); 2976 // Return argument 0 register. In the LP64 build pointers 2977 // take 2 registers, but the VM wants only the 'main' name. 2978 return regs.first(); 2979 } 2980 2981 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) { 2982 // This method is returning a data structure allocating as a 2983 // ResourceObject, so do not put any ResourceMarks in here. 2984 char *s = sig->as_C_string(); 2985 int len = (int)strlen(s); 2986 s++; len--; // Skip opening paren 2987 2988 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256); 2989 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256); 2990 int cnt = 0; 2991 if (has_receiver) { 2992 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature 2993 } 2994 2995 while (*s != ')') { // Find closing right paren 2996 switch (*s++) { // Switch on signature character 2997 case 'B': sig_bt[cnt++] = T_BYTE; break; 2998 case 'C': sig_bt[cnt++] = T_CHAR; break; 2999 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break; 3000 case 'F': sig_bt[cnt++] = T_FLOAT; break; 3001 case 'I': sig_bt[cnt++] = T_INT; break; 3002 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break; 3003 case 'S': sig_bt[cnt++] = T_SHORT; break; 3004 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break; 3005 case 'V': sig_bt[cnt++] = T_VOID; break; 3006 case 'L': // Oop 3007 while (*s++ != ';'); // Skip signature 3008 sig_bt[cnt++] = T_OBJECT; 3009 break; 3010 case '[': { // Array 3011 do { // Skip optional size 3012 while (*s >= '0' && *s <= '9') s++; 3013 } while (*s++ == '['); // Nested arrays? 3014 // Skip element type 3015 if (s[-1] == 'L') 3016 while (*s++ != ';'); // Skip signature 3017 sig_bt[cnt++] = T_ARRAY; 3018 break; 3019 } 3020 default : ShouldNotReachHere(); 3021 } 3022 } 3023 3024 if (has_appendix) { 3025 sig_bt[cnt++] = T_OBJECT; 3026 } 3027 3028 assert(cnt < 256, "grow table size"); 3029 3030 int comp_args_on_stack; 3031 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true); 3032 3033 // the calling convention doesn't count out_preserve_stack_slots so 3034 // we must add that in to get "true" stack offsets. 3035 3036 if (comp_args_on_stack) { 3037 for (int i = 0; i < cnt; i++) { 3038 VMReg reg1 = regs[i].first(); 3039 if (reg1->is_stack()) { 3040 // Yuck 3041 reg1 = reg1->bias(out_preserve_stack_slots()); 3042 } 3043 VMReg reg2 = regs[i].second(); 3044 if (reg2->is_stack()) { 3045 // Yuck 3046 reg2 = reg2->bias(out_preserve_stack_slots()); 3047 } 3048 regs[i].set_pair(reg2, reg1); 3049 } 3050 } 3051 3052 // results 3053 *arg_size = cnt; 3054 return regs; 3055 } 3056 3057 // OSR Migration Code 3058 // 3059 // This code is used convert interpreter frames into compiled frames. It is 3060 // called from very start of a compiled OSR nmethod. A temp array is 3061 // allocated to hold the interesting bits of the interpreter frame. All 3062 // active locks are inflated to allow them to move. The displaced headers and 3063 // active interpreter locals are copied into the temp buffer. Then we return 3064 // back to the compiled code. The compiled code then pops the current 3065 // interpreter frame off the stack and pushes a new compiled frame. Then it 3066 // copies the interpreter locals and displaced headers where it wants. 3067 // Finally it calls back to free the temp buffer. 3068 // 3069 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed. 3070 3071 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) ) 3072 3073 // 3074 // This code is dependent on the memory layout of the interpreter local 3075 // array and the monitors. On all of our platforms the layout is identical 3076 // so this code is shared. If some platform lays the their arrays out 3077 // differently then this code could move to platform specific code or 3078 // the code here could be modified to copy items one at a time using 3079 // frame accessor methods and be platform independent. 3080 3081 frame fr = thread->last_frame(); 3082 assert(fr.is_interpreted_frame(), ""); 3083 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks"); 3084 3085 // Figure out how many monitors are active. 3086 int active_monitor_count = 0; 3087 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 3088 kptr < fr.interpreter_frame_monitor_begin(); 3089 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 3090 if (kptr->obj() != NULL) active_monitor_count++; 3091 } 3092 3093 // QQQ we could place number of active monitors in the array so that compiled code 3094 // could double check it. 3095 3096 Method* moop = fr.interpreter_frame_method(); 3097 int max_locals = moop->max_locals(); 3098 // Allocate temp buffer, 1 word per local & 2 per active monitor 3099 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size(); 3100 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode); 3101 3102 // Copy the locals. Order is preserved so that loading of longs works. 3103 // Since there's no GC I can copy the oops blindly. 3104 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code"); 3105 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1), 3106 (HeapWord*)&buf[0], 3107 max_locals); 3108 3109 // Inflate locks. Copy the displaced headers. Be careful, there can be holes. 3110 int i = max_locals; 3111 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end(); 3112 kptr2 < fr.interpreter_frame_monitor_begin(); 3113 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) { 3114 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array 3115 BasicLock *lock = kptr2->lock(); 3116 // Disallow async deflation of the inflated monitor so the 3117 // displaced header stays stable until we've copied it. 3118 ObjectMonitorHandle omh; 3119 // Inflate so the displaced header becomes position-independent 3120 if (lock->displaced_header().is_unlocked()) { 3121 ObjectSynchronizer::inflate_helper(&omh, kptr2->obj()); 3122 } 3123 // Now the displaced header is free to move 3124 buf[i++] = (intptr_t)lock->displaced_header().value(); 3125 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj()); 3126 } 3127 } 3128 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors"); 3129 3130 return buf; 3131 JRT_END 3132 3133 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) ) 3134 FREE_C_HEAP_ARRAY(intptr_t, buf); 3135 JRT_END 3136 3137 bool AdapterHandlerLibrary::contains(const CodeBlob* b) { 3138 AdapterHandlerTableIterator iter(_adapters); 3139 while (iter.has_next()) { 3140 AdapterHandlerEntry* a = iter.next(); 3141 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true; 3142 } 3143 return false; 3144 } 3145 3146 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) { 3147 AdapterHandlerTableIterator iter(_adapters); 3148 while (iter.has_next()) { 3149 AdapterHandlerEntry* a = iter.next(); 3150 if (b == CodeCache::find_blob(a->get_i2c_entry())) { 3151 st->print("Adapter for signature: "); 3152 a->print_adapter_on(tty); 3153 return; 3154 } 3155 } 3156 assert(false, "Should have found handler"); 3157 } 3158 3159 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const { 3160 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string()); 3161 if (get_i2c_entry() != NULL) { 3162 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry())); 3163 } 3164 if (get_c2i_entry() != NULL) { 3165 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry())); 3166 } 3167 if (get_c2i_unverified_entry() != NULL) { 3168 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry())); 3169 } 3170 if (get_c2i_no_clinit_check_entry() != NULL) { 3171 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry())); 3172 } 3173 st->cr(); 3174 } 3175 3176 #if INCLUDE_CDS 3177 3178 void CDSAdapterHandlerEntry::init() { 3179 assert(DumpSharedSpaces, "used during dump time only"); 3180 _c2i_entry_trampoline = (address)MetaspaceShared::misc_code_space_alloc(SharedRuntime::trampoline_size()); 3181 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_code_space_alloc(sizeof(AdapterHandlerEntry*)); 3182 }; 3183 3184 #endif // INCLUDE_CDS 3185 3186 3187 #ifndef PRODUCT 3188 3189 void AdapterHandlerLibrary::print_statistics() { 3190 _adapters->print_statistics(); 3191 } 3192 3193 #endif /* PRODUCT */ 3194 3195 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread)) 3196 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone"); 3197 if (thread->stack_reserved_zone_disabled()) { 3198 thread->enable_stack_reserved_zone(); 3199 } 3200 thread->set_reserved_stack_activation(thread->stack_base()); 3201 JRT_END 3202 3203 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) { 3204 ResourceMark rm(thread); 3205 frame activation; 3206 CompiledMethod* nm = NULL; 3207 int count = 1; 3208 3209 assert(fr.is_java_frame(), "Must start on Java frame"); 3210 3211 while (true) { 3212 Method* method = NULL; 3213 bool found = false; 3214 if (fr.is_interpreted_frame()) { 3215 method = fr.interpreter_frame_method(); 3216 if (method != NULL && method->has_reserved_stack_access()) { 3217 found = true; 3218 } 3219 } else { 3220 CodeBlob* cb = fr.cb(); 3221 if (cb != NULL && cb->is_compiled()) { 3222 nm = cb->as_compiled_method(); 3223 method = nm->method(); 3224 // scope_desc_near() must be used, instead of scope_desc_at() because on 3225 // SPARC, the pcDesc can be on the delay slot after the call instruction. 3226 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != NULL; sd = sd->sender()) { 3227 method = sd->method(); 3228 if (method != NULL && method->has_reserved_stack_access()) { 3229 found = true; 3230 } 3231 } 3232 } 3233 } 3234 if (found) { 3235 activation = fr; 3236 warning("Potentially dangerous stack overflow in " 3237 "ReservedStackAccess annotated method %s [%d]", 3238 method->name_and_sig_as_C_string(), count++); 3239 EventReservedStackActivation event; 3240 if (event.should_commit()) { 3241 event.set_method(method); 3242 event.commit(); 3243 } 3244 } 3245 if (fr.is_first_java_frame()) { 3246 break; 3247 } else { 3248 fr = fr.java_sender(); 3249 } 3250 } 3251 return activation; 3252 } 3253 3254 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* thread) { 3255 // After any safepoint, just before going back to compiled code, 3256 // we inform the GC that we will be doing initializing writes to 3257 // this object in the future without emitting card-marks, so 3258 // GC may take any compensating steps. 3259 3260 oop new_obj = thread->vm_result(); 3261 if (new_obj == NULL) return; 3262 3263 BarrierSet *bs = BarrierSet::barrier_set(); 3264 bs->on_slowpath_allocation_exit(thread, new_obj); 3265 }