1 /* 2 * Copyright (c) 1997, 2018, 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/compilationPolicy.hpp" 61 #include "runtime/frame.inline.hpp" 62 #include "runtime/handles.inline.hpp" 63 #include "runtime/init.hpp" 64 #include "runtime/interfaceSupport.inline.hpp" 65 #include "runtime/java.hpp" 66 #include "runtime/javaCalls.hpp" 67 #include "runtime/sharedRuntime.hpp" 68 #include "runtime/stubRoutines.hpp" 69 #include "runtime/vframe.inline.hpp" 70 #include "runtime/vframeArray.hpp" 71 #include "utilities/copy.hpp" 72 #include "utilities/dtrace.hpp" 73 #include "utilities/events.hpp" 74 #include "utilities/hashtable.inline.hpp" 75 #include "utilities/macros.hpp" 76 #include "utilities/xmlstream.hpp" 77 #ifdef COMPILER1 78 #include "c1/c1_Runtime1.hpp" 79 #endif 80 81 // Shared stub locations 82 RuntimeStub* SharedRuntime::_wrong_method_blob; 83 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob; 84 RuntimeStub* SharedRuntime::_ic_miss_blob; 85 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob; 86 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob; 87 RuntimeStub* SharedRuntime::_resolve_static_call_blob; 88 address SharedRuntime::_resolve_static_call_entry; 89 90 DeoptimizationBlob* SharedRuntime::_deopt_blob; 91 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob; 92 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob; 93 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob; 94 95 #ifdef COMPILER2 96 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob; 97 #endif // COMPILER2 98 99 100 //----------------------------generate_stubs----------------------------------- 101 void SharedRuntime::generate_stubs() { 102 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub"); 103 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub"); 104 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub"); 105 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call"); 106 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call"); 107 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call"); 108 _resolve_static_call_entry = _resolve_static_call_blob->entry_point(); 109 110 #if COMPILER2_OR_JVMCI 111 // Vectors are generated only by C2 and JVMCI. 112 bool support_wide = is_wide_vector(MaxVectorSize); 113 if (support_wide) { 114 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP); 115 } 116 #endif // COMPILER2_OR_JVMCI 117 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP); 118 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN); 119 120 generate_deopt_blob(); 121 122 #ifdef COMPILER2 123 generate_uncommon_trap_blob(); 124 #endif // COMPILER2 125 } 126 127 #include <math.h> 128 129 // Implementation of SharedRuntime 130 131 #ifndef PRODUCT 132 // For statistics 133 int SharedRuntime::_ic_miss_ctr = 0; 134 int SharedRuntime::_wrong_method_ctr = 0; 135 int SharedRuntime::_resolve_static_ctr = 0; 136 int SharedRuntime::_resolve_virtual_ctr = 0; 137 int SharedRuntime::_resolve_opt_virtual_ctr = 0; 138 int SharedRuntime::_implicit_null_throws = 0; 139 int SharedRuntime::_implicit_div0_throws = 0; 140 int SharedRuntime::_throw_null_ctr = 0; 141 142 int SharedRuntime::_nof_normal_calls = 0; 143 int SharedRuntime::_nof_optimized_calls = 0; 144 int SharedRuntime::_nof_inlined_calls = 0; 145 int SharedRuntime::_nof_megamorphic_calls = 0; 146 int SharedRuntime::_nof_static_calls = 0; 147 int SharedRuntime::_nof_inlined_static_calls = 0; 148 int SharedRuntime::_nof_interface_calls = 0; 149 int SharedRuntime::_nof_optimized_interface_calls = 0; 150 int SharedRuntime::_nof_inlined_interface_calls = 0; 151 int SharedRuntime::_nof_megamorphic_interface_calls = 0; 152 int SharedRuntime::_nof_removable_exceptions = 0; 153 154 int SharedRuntime::_new_instance_ctr=0; 155 int SharedRuntime::_new_array_ctr=0; 156 int SharedRuntime::_multi1_ctr=0; 157 int SharedRuntime::_multi2_ctr=0; 158 int SharedRuntime::_multi3_ctr=0; 159 int SharedRuntime::_multi4_ctr=0; 160 int SharedRuntime::_multi5_ctr=0; 161 int SharedRuntime::_mon_enter_stub_ctr=0; 162 int SharedRuntime::_mon_exit_stub_ctr=0; 163 int SharedRuntime::_mon_enter_ctr=0; 164 int SharedRuntime::_mon_exit_ctr=0; 165 int SharedRuntime::_partial_subtype_ctr=0; 166 int SharedRuntime::_jbyte_array_copy_ctr=0; 167 int SharedRuntime::_jshort_array_copy_ctr=0; 168 int SharedRuntime::_jint_array_copy_ctr=0; 169 int SharedRuntime::_jlong_array_copy_ctr=0; 170 int SharedRuntime::_oop_array_copy_ctr=0; 171 int SharedRuntime::_checkcast_array_copy_ctr=0; 172 int SharedRuntime::_unsafe_array_copy_ctr=0; 173 int SharedRuntime::_generic_array_copy_ctr=0; 174 int SharedRuntime::_slow_array_copy_ctr=0; 175 int SharedRuntime::_find_handler_ctr=0; 176 int SharedRuntime::_rethrow_ctr=0; 177 178 int SharedRuntime::_ICmiss_index = 0; 179 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count]; 180 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count]; 181 182 183 void SharedRuntime::trace_ic_miss(address at) { 184 for (int i = 0; i < _ICmiss_index; i++) { 185 if (_ICmiss_at[i] == at) { 186 _ICmiss_count[i]++; 187 return; 188 } 189 } 190 int index = _ICmiss_index++; 191 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1; 192 _ICmiss_at[index] = at; 193 _ICmiss_count[index] = 1; 194 } 195 196 void SharedRuntime::print_ic_miss_histogram() { 197 if (ICMissHistogram) { 198 tty->print_cr("IC Miss Histogram:"); 199 int tot_misses = 0; 200 for (int i = 0; i < _ICmiss_index; i++) { 201 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]); 202 tot_misses += _ICmiss_count[i]; 203 } 204 tty->print_cr("Total IC misses: %7d", tot_misses); 205 } 206 } 207 #endif // PRODUCT 208 209 210 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x)) 211 return x * y; 212 JRT_END 213 214 215 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x)) 216 if (x == min_jlong && y == CONST64(-1)) { 217 return x; 218 } else { 219 return x / y; 220 } 221 JRT_END 222 223 224 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x)) 225 if (x == min_jlong && y == CONST64(-1)) { 226 return 0; 227 } else { 228 return x % y; 229 } 230 JRT_END 231 232 233 const juint float_sign_mask = 0x7FFFFFFF; 234 const juint float_infinity = 0x7F800000; 235 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF); 236 const julong double_infinity = CONST64(0x7FF0000000000000); 237 238 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y)) 239 #ifdef _WIN64 240 // 64-bit Windows on amd64 returns the wrong values for 241 // infinity operands. 242 union { jfloat f; juint i; } xbits, ybits; 243 xbits.f = x; 244 ybits.f = y; 245 // x Mod Infinity == x unless x is infinity 246 if (((xbits.i & float_sign_mask) != float_infinity) && 247 ((ybits.i & float_sign_mask) == float_infinity) ) { 248 return x; 249 } 250 return ((jfloat)fmod_winx64((double)x, (double)y)); 251 #else 252 return ((jfloat)fmod((double)x,(double)y)); 253 #endif 254 JRT_END 255 256 257 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y)) 258 #ifdef _WIN64 259 union { jdouble d; julong l; } xbits, ybits; 260 xbits.d = x; 261 ybits.d = y; 262 // x Mod Infinity == x unless x is infinity 263 if (((xbits.l & double_sign_mask) != double_infinity) && 264 ((ybits.l & double_sign_mask) == double_infinity) ) { 265 return x; 266 } 267 return ((jdouble)fmod_winx64((double)x, (double)y)); 268 #else 269 return ((jdouble)fmod((double)x,(double)y)); 270 #endif 271 JRT_END 272 273 #ifdef __SOFTFP__ 274 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y)) 275 return x + y; 276 JRT_END 277 278 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y)) 279 return x - y; 280 JRT_END 281 282 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y)) 283 return x * y; 284 JRT_END 285 286 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y)) 287 return x / y; 288 JRT_END 289 290 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y)) 291 return x + y; 292 JRT_END 293 294 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y)) 295 return x - y; 296 JRT_END 297 298 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y)) 299 return x * y; 300 JRT_END 301 302 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y)) 303 return x / y; 304 JRT_END 305 306 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x)) 307 return (jfloat)x; 308 JRT_END 309 310 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x)) 311 return (jdouble)x; 312 JRT_END 313 314 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x)) 315 return (jdouble)x; 316 JRT_END 317 318 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y)) 319 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/ 320 JRT_END 321 322 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y)) 323 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 324 JRT_END 325 326 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y)) 327 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */ 328 JRT_END 329 330 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y)) 331 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 332 JRT_END 333 334 // Functions to return the opposite of the aeabi functions for nan. 335 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y)) 336 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 337 JRT_END 338 339 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y)) 340 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 341 JRT_END 342 343 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y)) 344 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 345 JRT_END 346 347 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y)) 348 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 349 JRT_END 350 351 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y)) 352 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 353 JRT_END 354 355 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y)) 356 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 357 JRT_END 358 359 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y)) 360 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 361 JRT_END 362 363 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y)) 364 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 365 JRT_END 366 367 // Intrinsics make gcc generate code for these. 368 float SharedRuntime::fneg(float f) { 369 return -f; 370 } 371 372 double SharedRuntime::dneg(double f) { 373 return -f; 374 } 375 376 #endif // __SOFTFP__ 377 378 #if defined(__SOFTFP__) || defined(E500V2) 379 // Intrinsics make gcc generate code for these. 380 double SharedRuntime::dabs(double f) { 381 return (f <= (double)0.0) ? (double)0.0 - f : f; 382 } 383 384 #endif 385 386 #if defined(__SOFTFP__) || defined(PPC) 387 double SharedRuntime::dsqrt(double f) { 388 return sqrt(f); 389 } 390 #endif 391 392 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x)) 393 if (g_isnan(x)) 394 return 0; 395 if (x >= (jfloat) max_jint) 396 return max_jint; 397 if (x <= (jfloat) min_jint) 398 return min_jint; 399 return (jint) x; 400 JRT_END 401 402 403 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x)) 404 if (g_isnan(x)) 405 return 0; 406 if (x >= (jfloat) max_jlong) 407 return max_jlong; 408 if (x <= (jfloat) min_jlong) 409 return min_jlong; 410 return (jlong) x; 411 JRT_END 412 413 414 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x)) 415 if (g_isnan(x)) 416 return 0; 417 if (x >= (jdouble) max_jint) 418 return max_jint; 419 if (x <= (jdouble) min_jint) 420 return min_jint; 421 return (jint) x; 422 JRT_END 423 424 425 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x)) 426 if (g_isnan(x)) 427 return 0; 428 if (x >= (jdouble) max_jlong) 429 return max_jlong; 430 if (x <= (jdouble) min_jlong) 431 return min_jlong; 432 return (jlong) x; 433 JRT_END 434 435 436 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x)) 437 return (jfloat)x; 438 JRT_END 439 440 441 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x)) 442 return (jfloat)x; 443 JRT_END 444 445 446 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x)) 447 return (jdouble)x; 448 JRT_END 449 450 // Exception handling across interpreter/compiler boundaries 451 // 452 // exception_handler_for_return_address(...) returns the continuation address. 453 // The continuation address is the entry point of the exception handler of the 454 // previous frame depending on the return address. 455 456 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) { 457 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address)); 458 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?"); 459 460 // Reset method handle flag. 461 thread->set_is_method_handle_return(false); 462 463 #if INCLUDE_JVMCI 464 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear 465 // and other exception handler continuations do not read it 466 thread->set_exception_pc(NULL); 467 #endif // INCLUDE_JVMCI 468 469 // The fastest case first 470 CodeBlob* blob = CodeCache::find_blob(return_address); 471 CompiledMethod* nm = (blob != NULL) ? blob->as_compiled_method_or_null() : NULL; 472 if (nm != NULL) { 473 // Set flag if return address is a method handle call site. 474 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address)); 475 // native nmethods don't have exception handlers 476 assert(!nm->is_native_method(), "no exception handler"); 477 assert(nm->header_begin() != nm->exception_begin(), "no exception handler"); 478 if (nm->is_deopt_pc(return_address)) { 479 // If we come here because of a stack overflow, the stack may be 480 // unguarded. Reguard the stack otherwise if we return to the 481 // deopt blob and the stack bang causes a stack overflow we 482 // crash. 483 bool guard_pages_enabled = thread->stack_guards_enabled(); 484 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); 485 if (thread->reserved_stack_activation() != thread->stack_base()) { 486 thread->set_reserved_stack_activation(thread->stack_base()); 487 } 488 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash"); 489 return SharedRuntime::deopt_blob()->unpack_with_exception(); 490 } else { 491 return nm->exception_begin(); 492 } 493 } 494 495 // Entry code 496 if (StubRoutines::returns_to_call_stub(return_address)) { 497 return StubRoutines::catch_exception_entry(); 498 } 499 // Interpreted code 500 if (Interpreter::contains(return_address)) { 501 return Interpreter::rethrow_exception_entry(); 502 } 503 504 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub"); 505 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!"); 506 507 #ifndef PRODUCT 508 { ResourceMark rm; 509 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address)); 510 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here"); 511 tty->print_cr("b) other problem"); 512 } 513 #endif // PRODUCT 514 515 ShouldNotReachHere(); 516 return NULL; 517 } 518 519 520 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address)) 521 return raw_exception_handler_for_return_address(thread, return_address); 522 JRT_END 523 524 525 address SharedRuntime::get_poll_stub(address pc) { 526 address stub; 527 // Look up the code blob 528 CodeBlob *cb = CodeCache::find_blob(pc); 529 530 // Should be an nmethod 531 guarantee(cb != NULL && cb->is_compiled(), "safepoint polling: pc must refer to an nmethod"); 532 533 // Look up the relocation information 534 assert(((CompiledMethod*)cb)->is_at_poll_or_poll_return(pc), 535 "safepoint polling: type must be poll"); 536 537 #ifdef ASSERT 538 if (!((NativeInstruction*)pc)->is_safepoint_poll()) { 539 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc)); 540 Disassembler::decode(cb); 541 fatal("Only polling locations are used for safepoint"); 542 } 543 #endif 544 545 bool at_poll_return = ((CompiledMethod*)cb)->is_at_poll_return(pc); 546 bool has_wide_vectors = ((CompiledMethod*)cb)->has_wide_vectors(); 547 if (at_poll_return) { 548 assert(SharedRuntime::polling_page_return_handler_blob() != NULL, 549 "polling page return stub not created yet"); 550 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point(); 551 } else if (has_wide_vectors) { 552 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL, 553 "polling page vectors safepoint stub not created yet"); 554 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point(); 555 } else { 556 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL, 557 "polling page safepoint stub not created yet"); 558 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point(); 559 } 560 log_debug(safepoint)("... found polling page %s exception at pc = " 561 INTPTR_FORMAT ", stub =" INTPTR_FORMAT, 562 at_poll_return ? "return" : "loop", 563 (intptr_t)pc, (intptr_t)stub); 564 return stub; 565 } 566 567 568 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) { 569 assert(caller.is_interpreted_frame(), ""); 570 int args_size = ArgumentSizeComputer(sig).size() + 1; 571 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack"); 572 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1)); 573 assert(Universe::heap()->is_in(result) && oopDesc::is_oop(result), "receiver must be an oop"); 574 return result; 575 } 576 577 578 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) { 579 if (JvmtiExport::can_post_on_exceptions()) { 580 vframeStream vfst(thread, true); 581 methodHandle method = methodHandle(thread, vfst.method()); 582 address bcp = method()->bcp_from(vfst.bci()); 583 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception()); 584 } 585 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception); 586 } 587 588 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) { 589 Handle h_exception = Exceptions::new_exception(thread, name, message); 590 throw_and_post_jvmti_exception(thread, h_exception); 591 } 592 593 // The interpreter code to call this tracing function is only 594 // called/generated when UL is on for redefine, class and has the right level 595 // and tags. Since obsolete methods are never compiled, we don't have 596 // to modify the compilers to generate calls to this function. 597 // 598 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry( 599 JavaThread* thread, Method* method)) 600 if (method->is_obsolete()) { 601 // We are calling an obsolete method, but this is not necessarily 602 // an error. Our method could have been redefined just after we 603 // fetched the Method* from the constant pool. 604 ResourceMark rm; 605 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string()); 606 } 607 return 0; 608 JRT_END 609 610 // ret_pc points into caller; we are returning caller's exception handler 611 // for given exception 612 address SharedRuntime::compute_compiled_exc_handler(CompiledMethod* cm, address ret_pc, Handle& exception, 613 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) { 614 assert(cm != NULL, "must exist"); 615 ResourceMark rm; 616 617 #if INCLUDE_JVMCI 618 if (cm->is_compiled_by_jvmci()) { 619 // lookup exception handler for this pc 620 int catch_pco = ret_pc - cm->code_begin(); 621 ExceptionHandlerTable table(cm); 622 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0); 623 if (t != NULL) { 624 return cm->code_begin() + t->pco(); 625 } else { 626 return Deoptimization::deoptimize_for_missing_exception_handler(cm); 627 } 628 } 629 #endif // INCLUDE_JVMCI 630 631 nmethod* nm = cm->as_nmethod(); 632 ScopeDesc* sd = nm->scope_desc_at(ret_pc); 633 // determine handler bci, if any 634 EXCEPTION_MARK; 635 636 int handler_bci = -1; 637 int scope_depth = 0; 638 if (!force_unwind) { 639 int bci = sd->bci(); 640 bool recursive_exception = false; 641 do { 642 bool skip_scope_increment = false; 643 // exception handler lookup 644 Klass* ek = exception->klass(); 645 methodHandle mh(THREAD, sd->method()); 646 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD); 647 if (HAS_PENDING_EXCEPTION) { 648 recursive_exception = true; 649 // We threw an exception while trying to find the exception handler. 650 // Transfer the new exception to the exception handle which will 651 // be set into thread local storage, and do another lookup for an 652 // exception handler for this exception, this time starting at the 653 // BCI of the exception handler which caused the exception to be 654 // thrown (bugs 4307310 and 4546590). Set "exception" reference 655 // argument to ensure that the correct exception is thrown (4870175). 656 recursive_exception_occurred = true; 657 exception = Handle(THREAD, PENDING_EXCEPTION); 658 CLEAR_PENDING_EXCEPTION; 659 if (handler_bci >= 0) { 660 bci = handler_bci; 661 handler_bci = -1; 662 skip_scope_increment = true; 663 } 664 } 665 else { 666 recursive_exception = false; 667 } 668 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) { 669 sd = sd->sender(); 670 if (sd != NULL) { 671 bci = sd->bci(); 672 } 673 ++scope_depth; 674 } 675 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL)); 676 } 677 678 // found handling method => lookup exception handler 679 int catch_pco = ret_pc - nm->code_begin(); 680 681 ExceptionHandlerTable table(nm); 682 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth); 683 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) { 684 // Allow abbreviated catch tables. The idea is to allow a method 685 // to materialize its exceptions without committing to the exact 686 // routing of exceptions. In particular this is needed for adding 687 // a synthetic handler to unlock monitors when inlining 688 // synchronized methods since the unlock path isn't represented in 689 // the bytecodes. 690 t = table.entry_for(catch_pco, -1, 0); 691 } 692 693 #ifdef COMPILER1 694 if (t == NULL && nm->is_compiled_by_c1()) { 695 assert(nm->unwind_handler_begin() != NULL, ""); 696 return nm->unwind_handler_begin(); 697 } 698 #endif 699 700 if (t == NULL) { 701 ttyLocker ttyl; 702 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci); 703 tty->print_cr(" Exception:"); 704 exception->print(); 705 tty->cr(); 706 tty->print_cr(" Compiled exception table :"); 707 table.print(); 708 nm->print_code(); 709 guarantee(false, "missing exception handler"); 710 return NULL; 711 } 712 713 return nm->code_begin() + t->pco(); 714 } 715 716 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread)) 717 // These errors occur only at call sites 718 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError()); 719 JRT_END 720 721 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 722 // These errors occur only at call sites 723 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub"); 724 JRT_END 725 726 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread)) 727 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 728 JRT_END 729 730 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread)) 731 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 732 JRT_END 733 734 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread)) 735 // This entry point is effectively only used for NullPointerExceptions which occur at inline 736 // cache sites (when the callee activation is not yet set up) so we are at a call site 737 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 738 JRT_END 739 740 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread)) 741 throw_StackOverflowError_common(thread, false); 742 JRT_END 743 744 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread)) 745 throw_StackOverflowError_common(thread, true); 746 JRT_END 747 748 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) { 749 // We avoid using the normal exception construction in this case because 750 // it performs an upcall to Java, and we're already out of stack space. 751 Thread* THREAD = thread; 752 Klass* k = SystemDictionary::StackOverflowError_klass(); 753 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK); 754 if (delayed) { 755 java_lang_Throwable::set_message(exception_oop, 756 Universe::delayed_stack_overflow_error_message()); 757 } 758 Handle exception (thread, exception_oop); 759 if (StackTraceInThrowable) { 760 java_lang_Throwable::fill_in_stack_trace(exception); 761 } 762 // Increment counter for hs_err file reporting 763 Atomic::inc(&Exceptions::_stack_overflow_errors); 764 throw_and_post_jvmti_exception(thread, exception); 765 } 766 767 #if INCLUDE_JVMCI 768 address SharedRuntime::deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason) { 769 assert(deopt_reason > Deoptimization::Reason_none && deopt_reason < Deoptimization::Reason_LIMIT, "invalid deopt reason"); 770 thread->set_jvmci_implicit_exception_pc(pc); 771 thread->set_pending_deoptimization(Deoptimization::make_trap_request((Deoptimization::DeoptReason)deopt_reason, Deoptimization::Action_reinterpret)); 772 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap()); 773 } 774 #endif // INCLUDE_JVMCI 775 776 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread, 777 address pc, 778 SharedRuntime::ImplicitExceptionKind exception_kind) 779 { 780 address target_pc = NULL; 781 782 if (Interpreter::contains(pc)) { 783 #ifdef CC_INTERP 784 // C++ interpreter doesn't throw implicit exceptions 785 ShouldNotReachHere(); 786 #else 787 switch (exception_kind) { 788 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry(); 789 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry(); 790 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry(); 791 default: ShouldNotReachHere(); 792 } 793 #endif // !CC_INTERP 794 } else { 795 switch (exception_kind) { 796 case STACK_OVERFLOW: { 797 // Stack overflow only occurs upon frame setup; the callee is 798 // going to be unwound. Dispatch to a shared runtime stub 799 // which will cause the StackOverflowError to be fabricated 800 // and processed. 801 // Stack overflow should never occur during deoptimization: 802 // the compiled method bangs the stack by as much as the 803 // interpreter would need in case of a deoptimization. The 804 // deoptimization blob and uncommon trap blob bang the stack 805 // in a debug VM to verify the correctness of the compiled 806 // method stack banging. 807 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap"); 808 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc)); 809 return StubRoutines::throw_StackOverflowError_entry(); 810 } 811 812 case IMPLICIT_NULL: { 813 if (VtableStubs::contains(pc)) { 814 // We haven't yet entered the callee frame. Fabricate an 815 // exception and begin dispatching it in the caller. Since 816 // the caller was at a call site, it's safe to destroy all 817 // caller-saved registers, as these entry points do. 818 VtableStub* vt_stub = VtableStubs::stub_containing(pc); 819 820 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error. 821 if (vt_stub == NULL) return NULL; 822 823 if (vt_stub->is_abstract_method_error(pc)) { 824 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs"); 825 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc)); 826 // Instead of throwing the abstract method error here directly, we re-resolve 827 // and will throw the AbstractMethodError during resolve. As a result, we'll 828 // get a more detailed error message. 829 return SharedRuntime::get_handle_wrong_method_stub(); 830 } else { 831 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc)); 832 // Assert that the signal comes from the expected location in stub code. 833 assert(vt_stub->is_null_pointer_exception(pc), 834 "obtained signal from unexpected location in stub code"); 835 return StubRoutines::throw_NullPointerException_at_call_entry(); 836 } 837 } else { 838 CodeBlob* cb = CodeCache::find_blob(pc); 839 840 // If code blob is NULL, then return NULL to signal handler to report the SEGV error. 841 if (cb == NULL) return NULL; 842 843 // Exception happened in CodeCache. Must be either: 844 // 1. Inline-cache check in C2I handler blob, 845 // 2. Inline-cache check in nmethod, or 846 // 3. Implicit null exception in nmethod 847 848 if (!cb->is_compiled()) { 849 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob(); 850 if (!is_in_blob) { 851 // Allow normal crash reporting to handle this 852 return NULL; 853 } 854 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc)); 855 // There is no handler here, so we will simply unwind. 856 return StubRoutines::throw_NullPointerException_at_call_entry(); 857 } 858 859 // Otherwise, it's a compiled method. Consult its exception handlers. 860 CompiledMethod* cm = (CompiledMethod*)cb; 861 if (cm->inlinecache_check_contains(pc)) { 862 // exception happened inside inline-cache check code 863 // => the nmethod is not yet active (i.e., the frame 864 // is not set up yet) => use return address pushed by 865 // caller => don't push another return address 866 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc)); 867 return StubRoutines::throw_NullPointerException_at_call_entry(); 868 } 869 870 if (cm->method()->is_method_handle_intrinsic()) { 871 // exception happened inside MH dispatch code, similar to a vtable stub 872 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc)); 873 return StubRoutines::throw_NullPointerException_at_call_entry(); 874 } 875 876 #ifndef PRODUCT 877 _implicit_null_throws++; 878 #endif 879 #if INCLUDE_JVMCI 880 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) { 881 // If there's no PcDesc then we'll die way down inside of 882 // deopt instead of just getting normal error reporting, 883 // so only go there if it will succeed. 884 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_null_check); 885 } else { 886 #endif // INCLUDE_JVMCI 887 assert (cm->is_nmethod(), "Expect nmethod"); 888 target_pc = ((nmethod*)cm)->continuation_for_implicit_exception(pc); 889 #if INCLUDE_JVMCI 890 } 891 #endif // INCLUDE_JVMCI 892 // If there's an unexpected fault, target_pc might be NULL, 893 // in which case we want to fall through into the normal 894 // error handling code. 895 } 896 897 break; // fall through 898 } 899 900 901 case IMPLICIT_DIVIDE_BY_ZERO: { 902 CompiledMethod* cm = CodeCache::find_compiled(pc); 903 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions"); 904 #ifndef PRODUCT 905 _implicit_div0_throws++; 906 #endif 907 #if INCLUDE_JVMCI 908 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) { 909 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_div0_check); 910 } else { 911 #endif // INCLUDE_JVMCI 912 target_pc = cm->continuation_for_implicit_exception(pc); 913 #if INCLUDE_JVMCI 914 } 915 #endif // INCLUDE_JVMCI 916 // If there's an unexpected fault, target_pc might be NULL, 917 // in which case we want to fall through into the normal 918 // error handling code. 919 break; // fall through 920 } 921 922 default: ShouldNotReachHere(); 923 } 924 925 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind"); 926 927 if (exception_kind == IMPLICIT_NULL) { 928 #ifndef PRODUCT 929 // for AbortVMOnException flag 930 Exceptions::debug_check_abort("java.lang.NullPointerException"); 931 #endif //PRODUCT 932 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc)); 933 } else { 934 #ifndef PRODUCT 935 // for AbortVMOnException flag 936 Exceptions::debug_check_abort("java.lang.ArithmeticException"); 937 #endif //PRODUCT 938 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc)); 939 } 940 return target_pc; 941 } 942 943 ShouldNotReachHere(); 944 return NULL; 945 } 946 947 948 /** 949 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is 950 * installed in the native function entry of all native Java methods before 951 * they get linked to their actual native methods. 952 * 953 * \note 954 * This method actually never gets called! The reason is because 955 * the interpreter's native entries call NativeLookup::lookup() which 956 * throws the exception when the lookup fails. The exception is then 957 * caught and forwarded on the return from NativeLookup::lookup() call 958 * before the call to the native function. This might change in the future. 959 */ 960 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...)) 961 { 962 // We return a bad value here to make sure that the exception is 963 // forwarded before we look at the return value. 964 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress); 965 } 966 JNI_END 967 968 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() { 969 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error); 970 } 971 972 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) 973 #if INCLUDE_JVMCI 974 if (!obj->klass()->has_finalizer()) { 975 return; 976 } 977 #endif // INCLUDE_JVMCI 978 assert(oopDesc::is_oop(obj), "must be a valid oop"); 979 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise"); 980 InstanceKlass::register_finalizer(instanceOop(obj), CHECK); 981 JRT_END 982 983 984 jlong SharedRuntime::get_java_tid(Thread* thread) { 985 if (thread != NULL) { 986 if (thread->is_Java_thread()) { 987 oop obj = ((JavaThread*)thread)->threadObj(); 988 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj); 989 } 990 } 991 return 0; 992 } 993 994 /** 995 * This function ought to be a void function, but cannot be because 996 * it gets turned into a tail-call on sparc, which runs into dtrace bug 997 * 6254741. Once that is fixed we can remove the dummy return value. 998 */ 999 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) { 1000 return dtrace_object_alloc_base(Thread::current(), o, size); 1001 } 1002 1003 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) { 1004 assert(DTraceAllocProbes, "wrong call"); 1005 Klass* klass = o->klass(); 1006 Symbol* name = klass->name(); 1007 HOTSPOT_OBJECT_ALLOC( 1008 get_java_tid(thread), 1009 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize); 1010 return 0; 1011 } 1012 1013 JRT_LEAF(int, SharedRuntime::dtrace_method_entry( 1014 JavaThread* thread, Method* method)) 1015 assert(DTraceMethodProbes, "wrong call"); 1016 Symbol* kname = method->klass_name(); 1017 Symbol* name = method->name(); 1018 Symbol* sig = method->signature(); 1019 HOTSPOT_METHOD_ENTRY( 1020 get_java_tid(thread), 1021 (char *) kname->bytes(), kname->utf8_length(), 1022 (char *) name->bytes(), name->utf8_length(), 1023 (char *) sig->bytes(), sig->utf8_length()); 1024 return 0; 1025 JRT_END 1026 1027 JRT_LEAF(int, SharedRuntime::dtrace_method_exit( 1028 JavaThread* thread, Method* method)) 1029 assert(DTraceMethodProbes, "wrong call"); 1030 Symbol* kname = method->klass_name(); 1031 Symbol* name = method->name(); 1032 Symbol* sig = method->signature(); 1033 HOTSPOT_METHOD_RETURN( 1034 get_java_tid(thread), 1035 (char *) kname->bytes(), kname->utf8_length(), 1036 (char *) name->bytes(), name->utf8_length(), 1037 (char *) sig->bytes(), sig->utf8_length()); 1038 return 0; 1039 JRT_END 1040 1041 1042 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode) 1043 // for a call current in progress, i.e., arguments has been pushed on stack 1044 // put callee has not been invoked yet. Used by: resolve virtual/static, 1045 // vtable updates, etc. Caller frame must be compiled. 1046 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) { 1047 ResourceMark rm(THREAD); 1048 1049 // last java frame on stack (which includes native call frames) 1050 vframeStream vfst(thread, true); // Do not skip and javaCalls 1051 1052 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD); 1053 } 1054 1055 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) { 1056 CompiledMethod* caller = vfst.nm(); 1057 1058 nmethodLocker caller_lock(caller); 1059 1060 address pc = vfst.frame_pc(); 1061 { // Get call instruction under lock because another thread may be busy patching it. 1062 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1063 return caller->attached_method_before_pc(pc); 1064 } 1065 return NULL; 1066 } 1067 1068 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode 1069 // for a call current in progress, i.e., arguments has been pushed on stack 1070 // but callee has not been invoked yet. Caller frame must be compiled. 1071 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread, 1072 vframeStream& vfst, 1073 Bytecodes::Code& bc, 1074 CallInfo& callinfo, TRAPS) { 1075 Handle receiver; 1076 Handle nullHandle; //create a handy null handle for exception returns 1077 1078 assert(!vfst.at_end(), "Java frame must exist"); 1079 1080 // Find caller and bci from vframe 1081 methodHandle caller(THREAD, vfst.method()); 1082 int bci = vfst.bci(); 1083 1084 Bytecode_invoke bytecode(caller, bci); 1085 int bytecode_index = bytecode.index(); 1086 bc = bytecode.invoke_code(); 1087 1088 methodHandle attached_method = extract_attached_method(vfst); 1089 if (attached_method.not_null()) { 1090 methodHandle callee = bytecode.static_target(CHECK_NH); 1091 vmIntrinsics::ID id = callee->intrinsic_id(); 1092 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call, 1093 // it attaches statically resolved method to the call site. 1094 if (MethodHandles::is_signature_polymorphic(id) && 1095 MethodHandles::is_signature_polymorphic_intrinsic(id)) { 1096 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id); 1097 1098 // Adjust invocation mode according to the attached method. 1099 switch (bc) { 1100 case Bytecodes::_invokevirtual: 1101 if (attached_method->method_holder()->is_interface()) { 1102 bc = Bytecodes::_invokeinterface; 1103 } 1104 break; 1105 case Bytecodes::_invokeinterface: 1106 if (!attached_method->method_holder()->is_interface()) { 1107 bc = Bytecodes::_invokevirtual; 1108 } 1109 break; 1110 case Bytecodes::_invokehandle: 1111 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) { 1112 bc = attached_method->is_static() ? Bytecodes::_invokestatic 1113 : Bytecodes::_invokevirtual; 1114 } 1115 break; 1116 default: 1117 break; 1118 } 1119 } 1120 } 1121 1122 assert(bc != Bytecodes::_illegal, "not initialized"); 1123 1124 bool has_receiver = bc != Bytecodes::_invokestatic && 1125 bc != Bytecodes::_invokedynamic && 1126 bc != Bytecodes::_invokehandle; 1127 1128 // Find receiver for non-static call 1129 if (has_receiver) { 1130 // This register map must be update since we need to find the receiver for 1131 // compiled frames. The receiver might be in a register. 1132 RegisterMap reg_map2(thread); 1133 frame stubFrame = thread->last_frame(); 1134 // Caller-frame is a compiled frame 1135 frame callerFrame = stubFrame.sender(®_map2); 1136 1137 if (attached_method.is_null()) { 1138 methodHandle callee = bytecode.static_target(CHECK_NH); 1139 if (callee.is_null()) { 1140 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle); 1141 } 1142 } 1143 1144 // Retrieve from a compiled argument list 1145 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2)); 1146 1147 if (receiver.is_null()) { 1148 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle); 1149 } 1150 } 1151 1152 // Resolve method 1153 if (attached_method.not_null()) { 1154 // Parameterized by attached method. 1155 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH); 1156 } else { 1157 // Parameterized by bytecode. 1158 constantPoolHandle constants(THREAD, caller->constants()); 1159 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH); 1160 } 1161 1162 #ifdef ASSERT 1163 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls 1164 if (has_receiver) { 1165 assert(receiver.not_null(), "should have thrown exception"); 1166 Klass* receiver_klass = receiver->klass(); 1167 Klass* rk = NULL; 1168 if (attached_method.not_null()) { 1169 // In case there's resolved method attached, use its holder during the check. 1170 rk = attached_method->method_holder(); 1171 } else { 1172 // Klass is already loaded. 1173 constantPoolHandle constants(THREAD, caller->constants()); 1174 rk = constants->klass_ref_at(bytecode_index, CHECK_NH); 1175 } 1176 Klass* static_receiver_klass = rk; 1177 methodHandle callee = callinfo.selected_method(); 1178 assert(receiver_klass->is_subtype_of(static_receiver_klass), 1179 "actual receiver must be subclass of static receiver klass"); 1180 if (receiver_klass->is_instance_klass()) { 1181 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) { 1182 tty->print_cr("ERROR: Klass not yet initialized!!"); 1183 receiver_klass->print(); 1184 } 1185 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized"); 1186 } 1187 } 1188 #endif 1189 1190 return receiver; 1191 } 1192 1193 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) { 1194 ResourceMark rm(THREAD); 1195 // We need first to check if any Java activations (compiled, interpreted) 1196 // exist on the stack since last JavaCall. If not, we need 1197 // to get the target method from the JavaCall wrapper. 1198 vframeStream vfst(thread, true); // Do not skip any javaCalls 1199 methodHandle callee_method; 1200 if (vfst.at_end()) { 1201 // No Java frames were found on stack since we did the JavaCall. 1202 // Hence the stack can only contain an entry_frame. We need to 1203 // find the target method from the stub frame. 1204 RegisterMap reg_map(thread, false); 1205 frame fr = thread->last_frame(); 1206 assert(fr.is_runtime_frame(), "must be a runtimeStub"); 1207 fr = fr.sender(®_map); 1208 assert(fr.is_entry_frame(), "must be"); 1209 // fr is now pointing to the entry frame. 1210 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method()); 1211 } else { 1212 Bytecodes::Code bc; 1213 CallInfo callinfo; 1214 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle())); 1215 callee_method = callinfo.selected_method(); 1216 } 1217 assert(callee_method()->is_method(), "must be"); 1218 return callee_method; 1219 } 1220 1221 // Resolves a call. 1222 methodHandle SharedRuntime::resolve_helper(JavaThread *thread, 1223 bool is_virtual, 1224 bool is_optimized, TRAPS) { 1225 methodHandle callee_method; 1226 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1227 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 1228 int retry_count = 0; 1229 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() && 1230 callee_method->method_holder() != SystemDictionary::Object_klass()) { 1231 // If has a pending exception then there is no need to re-try to 1232 // resolve this method. 1233 // If the method has been redefined, we need to try again. 1234 // Hack: we have no way to update the vtables of arrays, so don't 1235 // require that java.lang.Object has been updated. 1236 1237 // It is very unlikely that method is redefined more than 100 times 1238 // in the middle of resolve. If it is looping here more than 100 times 1239 // means then there could be a bug here. 1240 guarantee((retry_count++ < 100), 1241 "Could not resolve to latest version of redefined method"); 1242 // method is redefined in the middle of resolve so re-try. 1243 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1244 } 1245 } 1246 return callee_method; 1247 } 1248 1249 // Resolves a call. The compilers generate code for calls that go here 1250 // and are patched with the real destination of the call. 1251 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread, 1252 bool is_virtual, 1253 bool is_optimized, TRAPS) { 1254 1255 ResourceMark rm(thread); 1256 RegisterMap cbl_map(thread, false); 1257 frame caller_frame = thread->last_frame().sender(&cbl_map); 1258 1259 CodeBlob* caller_cb = caller_frame.cb(); 1260 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method"); 1261 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null(); 1262 1263 // make sure caller is not getting deoptimized 1264 // and removed before we are done with it. 1265 // CLEANUP - with lazy deopt shouldn't need this lock 1266 nmethodLocker caller_lock(caller_nm); 1267 1268 // determine call info & receiver 1269 // note: a) receiver is NULL for static calls 1270 // b) an exception is thrown if receiver is NULL for non-static calls 1271 CallInfo call_info; 1272 Bytecodes::Code invoke_code = Bytecodes::_illegal; 1273 Handle receiver = find_callee_info(thread, invoke_code, 1274 call_info, CHECK_(methodHandle())); 1275 methodHandle callee_method = call_info.selected_method(); 1276 1277 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) || 1278 (!is_virtual && invoke_code == Bytecodes::_invokespecial) || 1279 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) || 1280 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) || 1281 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode"); 1282 1283 assert(caller_nm->is_alive() && !caller_nm->is_unloading(), "It should be alive"); 1284 1285 #ifndef PRODUCT 1286 // tracing/debugging/statistics 1287 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) : 1288 (is_virtual) ? (&_resolve_virtual_ctr) : 1289 (&_resolve_static_ctr); 1290 Atomic::inc(addr); 1291 1292 if (TraceCallFixup) { 1293 ResourceMark rm(thread); 1294 tty->print("resolving %s%s (%s) call to", 1295 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static", 1296 Bytecodes::name(invoke_code)); 1297 callee_method->print_short_name(tty); 1298 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, 1299 p2i(caller_frame.pc()), p2i(callee_method->code())); 1300 } 1301 #endif 1302 1303 // JSR 292 key invariant: 1304 // If the resolved method is a MethodHandle invoke target, the call 1305 // site must be a MethodHandle call site, because the lambda form might tail-call 1306 // leaving the stack in a state unknown to either caller or callee 1307 // TODO detune for now but we might need it again 1308 // assert(!callee_method->is_compiled_lambda_form() || 1309 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site"); 1310 1311 // Compute entry points. This might require generation of C2I converter 1312 // frames, so we cannot be holding any locks here. Furthermore, the 1313 // computation of the entry points is independent of patching the call. We 1314 // always return the entry-point, but we only patch the stub if the call has 1315 // not been deoptimized. Return values: For a virtual call this is an 1316 // (cached_oop, destination address) pair. For a static call/optimized 1317 // virtual this is just a destination address. 1318 1319 bool first_try = true; 1320 for (;;) { 1321 if (!first_try) { 1322 // Patching IC caches may fail if we run out if transition stubs. 1323 // We refill the ic stubs then. 1324 InlineCacheBuffer::refill_ic_stubs(); 1325 } 1326 first_try = false; 1327 1328 StaticCallInfo static_call_info; 1329 CompiledICInfo virtual_call_info; 1330 1331 // Make sure the callee nmethod does not get deoptimized and removed before 1332 // we are done patching the code. 1333 CompiledMethod* callee = callee_method->code(); 1334 1335 if (callee != NULL) { 1336 assert(callee->is_compiled(), "must be nmethod for patching"); 1337 } 1338 1339 if (callee != NULL && !callee->is_in_use()) { 1340 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded. 1341 callee = NULL; 1342 } 1343 nmethodLocker nl_callee(callee); 1344 #ifdef ASSERT 1345 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below 1346 #endif 1347 1348 bool is_nmethod = caller_nm->is_nmethod(); 1349 1350 if (is_virtual) { 1351 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check"); 1352 bool static_bound = call_info.resolved_method()->can_be_statically_bound(); 1353 Klass* klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass(); 1354 CompiledIC::compute_monomorphic_entry(callee_method, klass, 1355 is_optimized, static_bound, is_nmethod, virtual_call_info, 1356 CHECK_(methodHandle())); 1357 } else { 1358 // static call 1359 CompiledStaticCall::compute_entry(callee_method, is_nmethod, static_call_info); 1360 } 1361 1362 // grab lock, check for deoptimization and potentially patch caller 1363 { 1364 CompiledICLocker ml(caller_nm); 1365 1366 // Lock blocks for safepoint during which both nmethods can change state. 1367 1368 // Now that we are ready to patch if the Method* was redefined then 1369 // don't update call site and let the caller retry. 1370 // Don't update call site if callee nmethod was unloaded or deoptimized. 1371 // Don't update call site if callee nmethod was replaced by an other nmethod 1372 // which may happen when multiply alive nmethod (tiered compilation) 1373 // will be supported. 1374 if (!callee_method->is_old() && 1375 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) { 1376 #ifdef ASSERT 1377 // We must not try to patch to jump to an already unloaded method. 1378 if (dest_entry_point != 0) { 1379 CodeBlob* cb = CodeCache::find_blob(dest_entry_point); 1380 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee), 1381 "should not call unloaded nmethod"); 1382 } 1383 #endif 1384 if (is_virtual) { 1385 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc()); 1386 if (inline_cache->is_clean()) { 1387 if (!inline_cache->set_to_monomorphic(virtual_call_info)) { 1388 continue; 1389 } 1390 } 1391 } else { 1392 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc()); 1393 if (ssc->is_clean()) ssc->set(static_call_info); 1394 } 1395 } 1396 } // unlock CompiledICLocker 1397 break; 1398 } 1399 1400 return callee_method; 1401 } 1402 1403 1404 // Inline caches exist only in compiled code 1405 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread)) 1406 #ifdef ASSERT 1407 RegisterMap reg_map(thread, false); 1408 frame stub_frame = thread->last_frame(); 1409 assert(stub_frame.is_runtime_frame(), "sanity check"); 1410 frame caller_frame = stub_frame.sender(®_map); 1411 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame"); 1412 #endif /* ASSERT */ 1413 1414 methodHandle callee_method; 1415 JRT_BLOCK 1416 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL); 1417 // Return Method* through TLS 1418 thread->set_vm_result_2(callee_method()); 1419 JRT_BLOCK_END 1420 // return compiled code entry point after potential safepoints 1421 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1422 return callee_method->verified_code_entry(); 1423 JRT_END 1424 1425 1426 // Handle call site that has been made non-entrant 1427 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread)) 1428 // 6243940 We might end up in here if the callee is deoptimized 1429 // as we race to call it. We don't want to take a safepoint if 1430 // the caller was interpreted because the caller frame will look 1431 // interpreted to the stack walkers and arguments are now 1432 // "compiled" so it is much better to make this transition 1433 // invisible to the stack walking code. The i2c path will 1434 // place the callee method in the callee_target. It is stashed 1435 // there because if we try and find the callee by normal means a 1436 // safepoint is possible and have trouble gc'ing the compiled args. 1437 RegisterMap reg_map(thread, false); 1438 frame stub_frame = thread->last_frame(); 1439 assert(stub_frame.is_runtime_frame(), "sanity check"); 1440 frame caller_frame = stub_frame.sender(®_map); 1441 1442 if (caller_frame.is_interpreted_frame() || 1443 caller_frame.is_entry_frame()) { 1444 Method* callee = thread->callee_target(); 1445 guarantee(callee != NULL && callee->is_method(), "bad handshake"); 1446 thread->set_vm_result_2(callee); 1447 thread->set_callee_target(NULL); 1448 return callee->get_c2i_entry(); 1449 } 1450 1451 // Must be compiled to compiled path which is safe to stackwalk 1452 methodHandle callee_method; 1453 JRT_BLOCK 1454 // Force resolving of caller (if we called from compiled frame) 1455 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL); 1456 thread->set_vm_result_2(callee_method()); 1457 JRT_BLOCK_END 1458 // return compiled code entry point after potential safepoints 1459 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1460 return callee_method->verified_code_entry(); 1461 JRT_END 1462 1463 // Handle abstract method call 1464 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread)) 1465 // Verbose error message for AbstractMethodError. 1466 // Get the called method from the invoke bytecode. 1467 vframeStream vfst(thread, true); 1468 assert(!vfst.at_end(), "Java frame must exist"); 1469 methodHandle caller(vfst.method()); 1470 Bytecode_invoke invoke(caller, vfst.bci()); 1471 DEBUG_ONLY( invoke.verify(); ) 1472 1473 // Find the compiled caller frame. 1474 RegisterMap reg_map(thread); 1475 frame stubFrame = thread->last_frame(); 1476 assert(stubFrame.is_runtime_frame(), "must be"); 1477 frame callerFrame = stubFrame.sender(®_map); 1478 assert(callerFrame.is_compiled_frame(), "must be"); 1479 1480 // Install exception and return forward entry. 1481 address res = StubRoutines::throw_AbstractMethodError_entry(); 1482 JRT_BLOCK 1483 methodHandle callee = invoke.static_target(thread); 1484 if (!callee.is_null()) { 1485 oop recv = callerFrame.retrieve_receiver(®_map); 1486 Klass *recv_klass = (recv != NULL) ? recv->klass() : NULL; 1487 LinkResolver::throw_abstract_method_error(callee, recv_klass, thread); 1488 res = StubRoutines::forward_exception_entry(); 1489 } 1490 JRT_BLOCK_END 1491 return res; 1492 JRT_END 1493 1494 1495 // resolve a static call and patch code 1496 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread )) 1497 methodHandle callee_method; 1498 JRT_BLOCK 1499 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL); 1500 thread->set_vm_result_2(callee_method()); 1501 JRT_BLOCK_END 1502 // return compiled code entry point after potential safepoints 1503 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1504 return callee_method->verified_code_entry(); 1505 JRT_END 1506 1507 1508 // resolve virtual call and update inline cache to monomorphic 1509 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread )) 1510 methodHandle callee_method; 1511 JRT_BLOCK 1512 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL); 1513 thread->set_vm_result_2(callee_method()); 1514 JRT_BLOCK_END 1515 // return compiled code entry point after potential safepoints 1516 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1517 return callee_method->verified_code_entry(); 1518 JRT_END 1519 1520 1521 // Resolve a virtual call that can be statically bound (e.g., always 1522 // monomorphic, so it has no inline cache). Patch code to resolved target. 1523 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread)) 1524 methodHandle callee_method; 1525 JRT_BLOCK 1526 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL); 1527 thread->set_vm_result_2(callee_method()); 1528 JRT_BLOCK_END 1529 // return compiled code entry point after potential safepoints 1530 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1531 return callee_method->verified_code_entry(); 1532 JRT_END 1533 1534 1535 1536 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) { 1537 ResourceMark rm(thread); 1538 CallInfo call_info; 1539 Bytecodes::Code bc; 1540 1541 // receiver is NULL for static calls. An exception is thrown for NULL 1542 // receivers for non-static calls 1543 Handle receiver = find_callee_info(thread, bc, call_info, 1544 CHECK_(methodHandle())); 1545 // Compiler1 can produce virtual call sites that can actually be statically bound 1546 // If we fell thru to below we would think that the site was going megamorphic 1547 // when in fact the site can never miss. Worse because we'd think it was megamorphic 1548 // we'd try and do a vtable dispatch however methods that can be statically bound 1549 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a 1550 // reresolution of the call site (as if we did a handle_wrong_method and not an 1551 // plain ic_miss) and the site will be converted to an optimized virtual call site 1552 // never to miss again. I don't believe C2 will produce code like this but if it 1553 // did this would still be the correct thing to do for it too, hence no ifdef. 1554 // 1555 if (call_info.resolved_method()->can_be_statically_bound()) { 1556 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle())); 1557 if (TraceCallFixup) { 1558 RegisterMap reg_map(thread, false); 1559 frame caller_frame = thread->last_frame().sender(®_map); 1560 ResourceMark rm(thread); 1561 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc)); 1562 callee_method->print_short_name(tty); 1563 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc())); 1564 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1565 } 1566 return callee_method; 1567 } 1568 1569 methodHandle callee_method = call_info.selected_method(); 1570 1571 #ifndef PRODUCT 1572 Atomic::inc(&_ic_miss_ctr); 1573 1574 // Statistics & Tracing 1575 if (TraceCallFixup) { 1576 ResourceMark rm(thread); 1577 tty->print("IC miss (%s) call to", Bytecodes::name(bc)); 1578 callee_method->print_short_name(tty); 1579 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1580 } 1581 1582 if (ICMissHistogram) { 1583 MutexLocker m(VMStatistic_lock); 1584 RegisterMap reg_map(thread, false); 1585 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub 1586 // produce statistics under the lock 1587 trace_ic_miss(f.pc()); 1588 } 1589 #endif 1590 1591 // install an event collector so that when a vtable stub is created the 1592 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The 1593 // event can't be posted when the stub is created as locks are held 1594 // - instead the event will be deferred until the event collector goes 1595 // out of scope. 1596 JvmtiDynamicCodeEventCollector event_collector; 1597 1598 // Update inline cache to megamorphic. Skip update if we are called from interpreted. 1599 bool first_try = true; 1600 for (;;) { 1601 if (!first_try) { 1602 // Transitioning IC caches may require transition stubs. If we run out 1603 // of transition stubs, we have to drop locks and perform a safepoint 1604 // that refills them. 1605 InlineCacheBuffer::refill_ic_stubs(); 1606 } 1607 first_try = false; 1608 RegisterMap reg_map(thread, false); 1609 frame caller_frame = thread->last_frame().sender(®_map); 1610 CodeBlob* cb = caller_frame.cb(); 1611 CompiledMethod* caller_nm = cb->as_compiled_method_or_null(); 1612 CompiledICLocker ml(caller_nm); 1613 1614 if (!cb->is_compiled()) { 1615 Unimplemented(); 1616 } 1617 CompiledIC* inline_cache = CompiledIC_before(((CompiledMethod*)cb), caller_frame.pc()); 1618 bool should_be_mono = false; 1619 if (inline_cache->is_optimized()) { 1620 if (TraceCallFixup) { 1621 ResourceMark rm(thread); 1622 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc)); 1623 callee_method->print_short_name(tty); 1624 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1625 } 1626 should_be_mono = true; 1627 } else if (inline_cache->is_icholder_call()) { 1628 CompiledICHolder* ic_oop = inline_cache->cached_icholder(); 1629 if (ic_oop != NULL) { 1630 if (!ic_oop->is_loader_alive()) { 1631 // Deferred IC cleaning due to concurrent class unloading 1632 inline_cache->set_to_clean(); 1633 } else if (receiver()->klass() == ic_oop->holder_klass()) { 1634 // This isn't a real miss. We must have seen that compiled code 1635 // is now available and we want the call site converted to a 1636 // monomorphic compiled call site. 1637 // We can't assert for callee_method->code() != NULL because it 1638 // could have been deoptimized in the meantime 1639 if (TraceCallFixup) { 1640 ResourceMark rm(thread); 1641 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc)); 1642 callee_method->print_short_name(tty); 1643 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1644 } 1645 should_be_mono = true; 1646 } 1647 } 1648 } 1649 1650 if (should_be_mono) { 1651 // We have a path that was monomorphic but was going interpreted 1652 // and now we have (or had) a compiled entry. We correct the IC 1653 // by using a new icBuffer. 1654 CompiledICInfo info; 1655 Klass* receiver_klass = receiver()->klass(); 1656 inline_cache->compute_monomorphic_entry(callee_method, 1657 receiver_klass, 1658 inline_cache->is_optimized(), 1659 false, caller_nm->is_nmethod(), 1660 info, CHECK_(methodHandle())); 1661 if (!inline_cache->set_to_monomorphic(info)) { 1662 continue; 1663 } 1664 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) { 1665 // Potential change to megamorphic 1666 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle())); 1667 if (!successful) { 1668 if (!inline_cache->set_to_clean()) { 1669 continue; 1670 } 1671 } 1672 } else { 1673 // Either clean or megamorphic 1674 } 1675 break; 1676 } // Release CompiledICLocker 1677 1678 return callee_method; 1679 } 1680 1681 // 1682 // Resets a call-site in compiled code so it will get resolved again. 1683 // This routines handles both virtual call sites, optimized virtual call 1684 // sites, and static call sites. Typically used to change a call sites 1685 // destination from compiled to interpreted. 1686 // 1687 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) { 1688 ResourceMark rm(thread); 1689 RegisterMap reg_map(thread, false); 1690 frame stub_frame = thread->last_frame(); 1691 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub"); 1692 frame caller = stub_frame.sender(®_map); 1693 1694 // Do nothing if the frame isn't a live compiled frame. 1695 // nmethod could be deoptimized by the time we get here 1696 // so no update to the caller is needed. 1697 1698 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) { 1699 1700 address pc = caller.pc(); 1701 1702 // Check for static or virtual call 1703 bool is_static_call = false; 1704 CompiledMethod* caller_nm = CodeCache::find_compiled(pc); 1705 1706 // Default call_addr is the location of the "basic" call. 1707 // Determine the address of the call we a reresolving. With 1708 // Inline Caches we will always find a recognizable call. 1709 // With Inline Caches disabled we may or may not find a 1710 // recognizable call. We will always find a call for static 1711 // calls and for optimized virtual calls. For vanilla virtual 1712 // calls it depends on the state of the UseInlineCaches switch. 1713 // 1714 // With Inline Caches disabled we can get here for a virtual call 1715 // for two reasons: 1716 // 1 - calling an abstract method. The vtable for abstract methods 1717 // will run us thru handle_wrong_method and we will eventually 1718 // end up in the interpreter to throw the ame. 1719 // 2 - a racing deoptimization. We could be doing a vanilla vtable 1720 // call and between the time we fetch the entry address and 1721 // we jump to it the target gets deoptimized. Similar to 1 1722 // we will wind up in the interprter (thru a c2i with c2). 1723 // 1724 address call_addr = NULL; 1725 { 1726 // Get call instruction under lock because another thread may be 1727 // busy patching it. 1728 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1729 // Location of call instruction 1730 call_addr = caller_nm->call_instruction_address(pc); 1731 } 1732 // Make sure nmethod doesn't get deoptimized and removed until 1733 // this is done with it. 1734 // CLEANUP - with lazy deopt shouldn't need this lock 1735 nmethodLocker nmlock(caller_nm); 1736 1737 if (call_addr != NULL) { 1738 RelocIterator iter(caller_nm, call_addr, call_addr+1); 1739 int ret = iter.next(); // Get item 1740 if (ret) { 1741 assert(iter.addr() == call_addr, "must find call"); 1742 if (iter.type() == relocInfo::static_call_type) { 1743 is_static_call = true; 1744 } else { 1745 assert(iter.type() == relocInfo::virtual_call_type || 1746 iter.type() == relocInfo::opt_virtual_call_type 1747 , "unexpected relocInfo. type"); 1748 } 1749 } else { 1750 assert(!UseInlineCaches, "relocation info. must exist for this address"); 1751 } 1752 1753 // Cleaning the inline cache will force a new resolve. This is more robust 1754 // than directly setting it to the new destination, since resolving of calls 1755 // is always done through the same code path. (experience shows that it 1756 // leads to very hard to track down bugs, if an inline cache gets updated 1757 // to a wrong method). It should not be performance critical, since the 1758 // resolve is only done once. 1759 1760 CompiledICLocker ml(caller_nm); 1761 if (is_static_call) { 1762 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr); 1763 ssc->set_to_clean(); 1764 } else { 1765 // compiled, dispatched call (which used to call an interpreted method) 1766 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr); 1767 inline_cache->set_to_clean(); 1768 } 1769 } 1770 } 1771 1772 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle())); 1773 1774 1775 #ifndef PRODUCT 1776 Atomic::inc(&_wrong_method_ctr); 1777 1778 if (TraceCallFixup) { 1779 ResourceMark rm(thread); 1780 tty->print("handle_wrong_method reresolving call to"); 1781 callee_method->print_short_name(tty); 1782 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1783 } 1784 #endif 1785 1786 return callee_method; 1787 } 1788 1789 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) { 1790 // The faulting unsafe accesses should be changed to throw the error 1791 // synchronously instead. Meanwhile the faulting instruction will be 1792 // skipped over (effectively turning it into a no-op) and an 1793 // asynchronous exception will be raised which the thread will 1794 // handle at a later point. If the instruction is a load it will 1795 // return garbage. 1796 1797 // Request an async exception. 1798 thread->set_pending_unsafe_access_error(); 1799 1800 // Return address of next instruction to execute. 1801 return next_pc; 1802 } 1803 1804 #ifdef ASSERT 1805 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method, 1806 const BasicType* sig_bt, 1807 const VMRegPair* regs) { 1808 ResourceMark rm; 1809 const int total_args_passed = method->size_of_parameters(); 1810 const VMRegPair* regs_with_member_name = regs; 1811 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1); 1812 1813 const int member_arg_pos = total_args_passed - 1; 1814 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob"); 1815 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object"); 1816 1817 const bool is_outgoing = method->is_method_handle_intrinsic(); 1818 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing); 1819 1820 for (int i = 0; i < member_arg_pos; i++) { 1821 VMReg a = regs_with_member_name[i].first(); 1822 VMReg b = regs_without_member_name[i].first(); 1823 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value()); 1824 } 1825 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg"); 1826 } 1827 #endif 1828 1829 bool SharedRuntime::should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb) { 1830 if (destination != entry_point) { 1831 CodeBlob* callee = CodeCache::find_blob(destination); 1832 // callee == cb seems weird. It means calling interpreter thru stub. 1833 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) { 1834 // static call or optimized virtual 1835 if (TraceCallFixup) { 1836 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1837 moop->print_short_name(tty); 1838 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1839 } 1840 return true; 1841 } else { 1842 if (TraceCallFixup) { 1843 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1844 moop->print_short_name(tty); 1845 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1846 } 1847 // assert is too strong could also be resolve destinations. 1848 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be"); 1849 } 1850 } else { 1851 if (TraceCallFixup) { 1852 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1853 moop->print_short_name(tty); 1854 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1855 } 1856 } 1857 return false; 1858 } 1859 1860 // --------------------------------------------------------------------------- 1861 // We are calling the interpreter via a c2i. Normally this would mean that 1862 // we were called by a compiled method. However we could have lost a race 1863 // where we went int -> i2c -> c2i and so the caller could in fact be 1864 // interpreted. If the caller is compiled we attempt to patch the caller 1865 // so he no longer calls into the interpreter. 1866 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc)) 1867 Method* moop(method); 1868 1869 address entry_point = moop->from_compiled_entry_no_trampoline(); 1870 1871 // It's possible that deoptimization can occur at a call site which hasn't 1872 // been resolved yet, in which case this function will be called from 1873 // an nmethod that has been patched for deopt and we can ignore the 1874 // request for a fixup. 1875 // Also it is possible that we lost a race in that from_compiled_entry 1876 // is now back to the i2c in that case we don't need to patch and if 1877 // we did we'd leap into space because the callsite needs to use 1878 // "to interpreter" stub in order to load up the Method*. Don't 1879 // ask me how I know this... 1880 1881 CodeBlob* cb = CodeCache::find_blob(caller_pc); 1882 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) { 1883 return; 1884 } 1885 1886 // The check above makes sure this is a nmethod. 1887 CompiledMethod* nm = cb->as_compiled_method_or_null(); 1888 assert(nm, "must be"); 1889 1890 // Get the return PC for the passed caller PC. 1891 address return_pc = caller_pc + frame::pc_return_offset; 1892 1893 // There is a benign race here. We could be attempting to patch to a compiled 1894 // entry point at the same time the callee is being deoptimized. If that is 1895 // the case then entry_point may in fact point to a c2i and we'd patch the 1896 // call site with the same old data. clear_code will set code() to NULL 1897 // at the end of it. If we happen to see that NULL then we can skip trying 1898 // to patch. If we hit the window where the callee has a c2i in the 1899 // from_compiled_entry and the NULL isn't present yet then we lose the race 1900 // and patch the code with the same old data. Asi es la vida. 1901 1902 if (moop->code() == NULL) return; 1903 1904 if (nm->is_in_use()) { 1905 1906 // Expect to find a native call there (unless it was no-inline cache vtable dispatch) 1907 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1908 if (NativeCall::is_call_before(return_pc)) { 1909 ResourceMark mark; 1910 NativeCallWrapper* call = nm->call_wrapper_before(return_pc); 1911 // 1912 // bug 6281185. We might get here after resolving a call site to a vanilla 1913 // virtual call. Because the resolvee uses the verified entry it may then 1914 // see compiled code and attempt to patch the site by calling us. This would 1915 // then incorrectly convert the call site to optimized and its downhill from 1916 // there. If you're lucky you'll get the assert in the bugid, if not you've 1917 // just made a call site that could be megamorphic into a monomorphic site 1918 // for the rest of its life! Just another racing bug in the life of 1919 // fixup_callers_callsite ... 1920 // 1921 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address()); 1922 iter.next(); 1923 assert(iter.has_current(), "must have a reloc at java call site"); 1924 relocInfo::relocType typ = iter.reloc()->type(); 1925 if (typ != relocInfo::static_call_type && 1926 typ != relocInfo::opt_virtual_call_type && 1927 typ != relocInfo::static_stub_type) { 1928 return; 1929 } 1930 address destination = call->destination(); 1931 if (should_fixup_call_destination(destination, entry_point, caller_pc, moop, cb)) { 1932 call->set_destination_mt_safe(entry_point); 1933 } 1934 } 1935 } 1936 IRT_END 1937 1938 1939 // same as JVM_Arraycopy, but called directly from compiled code 1940 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos, 1941 oopDesc* dest, jint dest_pos, 1942 jint length, 1943 JavaThread* thread)) { 1944 #ifndef PRODUCT 1945 _slow_array_copy_ctr++; 1946 #endif 1947 // Check if we have null pointers 1948 if (src == NULL || dest == NULL) { 1949 THROW(vmSymbols::java_lang_NullPointerException()); 1950 } 1951 // Do the copy. The casts to arrayOop are necessary to the copy_array API, 1952 // even though the copy_array API also performs dynamic checks to ensure 1953 // that src and dest are truly arrays (and are conformable). 1954 // The copy_array mechanism is awkward and could be removed, but 1955 // the compilers don't call this function except as a last resort, 1956 // so it probably doesn't matter. 1957 src->klass()->copy_array((arrayOopDesc*)src, src_pos, 1958 (arrayOopDesc*)dest, dest_pos, 1959 length, thread); 1960 } 1961 JRT_END 1962 1963 // The caller of generate_class_cast_message() (or one of its callers) 1964 // must use a ResourceMark in order to correctly free the result. 1965 char* SharedRuntime::generate_class_cast_message( 1966 JavaThread* thread, Klass* caster_klass) { 1967 1968 // Get target class name from the checkcast instruction 1969 vframeStream vfst(thread, true); 1970 assert(!vfst.at_end(), "Java frame must exist"); 1971 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci())); 1972 constantPoolHandle cpool(thread, vfst.method()->constants()); 1973 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index()); 1974 Symbol* target_klass_name = NULL; 1975 if (target_klass == NULL) { 1976 // This klass should be resolved, but just in case, get the name in the klass slot. 1977 target_klass_name = cpool->klass_name_at(cc.index()); 1978 } 1979 return generate_class_cast_message(caster_klass, target_klass, target_klass_name); 1980 } 1981 1982 1983 // The caller of generate_class_cast_message() (or one of its callers) 1984 // must use a ResourceMark in order to correctly free the result. 1985 char* SharedRuntime::generate_class_cast_message( 1986 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) { 1987 const char* caster_name = caster_klass->external_name(); 1988 1989 assert(target_klass != NULL || target_klass_name != NULL, "one must be provided"); 1990 const char* target_name = target_klass == NULL ? target_klass_name->as_C_string() : 1991 target_klass->external_name(); 1992 1993 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1; 1994 1995 const char* caster_klass_description = ""; 1996 const char* target_klass_description = ""; 1997 const char* klass_separator = ""; 1998 if (target_klass != NULL && caster_klass->module() == target_klass->module()) { 1999 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass); 2000 } else { 2001 caster_klass_description = caster_klass->class_in_module_of_loader(); 2002 target_klass_description = (target_klass != NULL) ? target_klass->class_in_module_of_loader() : ""; 2003 klass_separator = (target_klass != NULL) ? "; " : ""; 2004 } 2005 2006 // add 3 for parenthesis and preceeding space 2007 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3; 2008 2009 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen); 2010 if (message == NULL) { 2011 // Shouldn't happen, but don't cause even more problems if it does 2012 message = const_cast<char*>(caster_klass->external_name()); 2013 } else { 2014 jio_snprintf(message, 2015 msglen, 2016 "class %s cannot be cast to class %s (%s%s%s)", 2017 caster_name, 2018 target_name, 2019 caster_klass_description, 2020 klass_separator, 2021 target_klass_description 2022 ); 2023 } 2024 return message; 2025 } 2026 2027 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages()) 2028 (void) JavaThread::current()->reguard_stack(); 2029 JRT_END 2030 2031 2032 // Handles the uncommon case in locking, i.e., contention or an inflated lock. 2033 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread)) 2034 if (!SafepointSynchronize::is_synchronizing()) { 2035 // Only try quick_enter() if we're not trying to reach a safepoint 2036 // so that the calling thread reaches the safepoint more quickly. 2037 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return; 2038 } 2039 // NO_ASYNC required because an async exception on the state transition destructor 2040 // would leave you with the lock held and it would never be released. 2041 // The normal monitorenter NullPointerException is thrown without acquiring a lock 2042 // and the model is that an exception implies the method failed. 2043 JRT_BLOCK_NO_ASYNC 2044 oop obj(_obj); 2045 if (PrintBiasedLockingStatistics) { 2046 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 2047 } 2048 Handle h_obj(THREAD, obj); 2049 if (UseBiasedLocking) { 2050 // Retry fast entry if bias is revoked to avoid unnecessary inflation 2051 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK); 2052 } else { 2053 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK); 2054 } 2055 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here"); 2056 JRT_BLOCK_END 2057 JRT_END 2058 2059 // Handles the uncommon cases of monitor unlocking in compiled code 2060 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD)) 2061 oop obj(_obj); 2062 assert(JavaThread::current() == THREAD, "invariant"); 2063 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore 2064 // testing was unable to ever fire the assert that guarded it so I have removed it. 2065 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?"); 2066 #undef MIGHT_HAVE_PENDING 2067 #ifdef MIGHT_HAVE_PENDING 2068 // Save and restore any pending_exception around the exception mark. 2069 // While the slow_exit must not throw an exception, we could come into 2070 // this routine with one set. 2071 oop pending_excep = NULL; 2072 const char* pending_file; 2073 int pending_line; 2074 if (HAS_PENDING_EXCEPTION) { 2075 pending_excep = PENDING_EXCEPTION; 2076 pending_file = THREAD->exception_file(); 2077 pending_line = THREAD->exception_line(); 2078 CLEAR_PENDING_EXCEPTION; 2079 } 2080 #endif /* MIGHT_HAVE_PENDING */ 2081 2082 { 2083 // Exit must be non-blocking, and therefore no exceptions can be thrown. 2084 EXCEPTION_MARK; 2085 ObjectSynchronizer::slow_exit(obj, lock, THREAD); 2086 } 2087 2088 #ifdef MIGHT_HAVE_PENDING 2089 if (pending_excep != NULL) { 2090 THREAD->set_pending_exception(pending_excep, pending_file, pending_line); 2091 } 2092 #endif /* MIGHT_HAVE_PENDING */ 2093 JRT_END 2094 2095 #ifndef PRODUCT 2096 2097 void SharedRuntime::print_statistics() { 2098 ttyLocker ttyl; 2099 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'"); 2100 2101 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr); 2102 2103 SharedRuntime::print_ic_miss_histogram(); 2104 2105 if (CountRemovableExceptions) { 2106 if (_nof_removable_exceptions > 0) { 2107 Unimplemented(); // this counter is not yet incremented 2108 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions); 2109 } 2110 } 2111 2112 // Dump the JRT_ENTRY counters 2113 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr); 2114 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr); 2115 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr); 2116 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr); 2117 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr); 2118 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr); 2119 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr); 2120 2121 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr); 2122 tty->print_cr("%5d wrong method", _wrong_method_ctr); 2123 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr); 2124 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr); 2125 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr); 2126 2127 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr); 2128 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr); 2129 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr); 2130 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr); 2131 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr); 2132 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr); 2133 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr); 2134 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr); 2135 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr); 2136 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr); 2137 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr); 2138 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr); 2139 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr); 2140 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr); 2141 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr); 2142 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr); 2143 2144 AdapterHandlerLibrary::print_statistics(); 2145 2146 if (xtty != NULL) xtty->tail("statistics"); 2147 } 2148 2149 inline double percent(int x, int y) { 2150 return 100.0 * x / MAX2(y, 1); 2151 } 2152 2153 class MethodArityHistogram { 2154 public: 2155 enum { MAX_ARITY = 256 }; 2156 private: 2157 static int _arity_histogram[MAX_ARITY]; // histogram of #args 2158 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words 2159 static int _max_arity; // max. arity seen 2160 static int _max_size; // max. arg size seen 2161 2162 static void add_method_to_histogram(nmethod* nm) { 2163 if (CompiledMethod::nmethod_access_is_safe(nm)) { 2164 Method* method = nm->method(); 2165 ArgumentCount args(method->signature()); 2166 int arity = args.size() + (method->is_static() ? 0 : 1); 2167 int argsize = method->size_of_parameters(); 2168 arity = MIN2(arity, MAX_ARITY-1); 2169 argsize = MIN2(argsize, MAX_ARITY-1); 2170 int count = method->compiled_invocation_count(); 2171 _arity_histogram[arity] += count; 2172 _size_histogram[argsize] += count; 2173 _max_arity = MAX2(_max_arity, arity); 2174 _max_size = MAX2(_max_size, argsize); 2175 } 2176 } 2177 2178 void print_histogram_helper(int n, int* histo, const char* name) { 2179 const int N = MIN2(5, n); 2180 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 2181 double sum = 0; 2182 double weighted_sum = 0; 2183 int i; 2184 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; } 2185 double rest = sum; 2186 double percent = sum / 100; 2187 for (i = 0; i <= N; i++) { 2188 rest -= histo[i]; 2189 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent); 2190 } 2191 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent); 2192 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n); 2193 } 2194 2195 void print_histogram() { 2196 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 2197 print_histogram_helper(_max_arity, _arity_histogram, "arity"); 2198 tty->print_cr("\nSame for parameter size (in words):"); 2199 print_histogram_helper(_max_size, _size_histogram, "size"); 2200 tty->cr(); 2201 } 2202 2203 public: 2204 MethodArityHistogram() { 2205 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2206 _max_arity = _max_size = 0; 2207 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0; 2208 CodeCache::nmethods_do(add_method_to_histogram); 2209 print_histogram(); 2210 } 2211 }; 2212 2213 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY]; 2214 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY]; 2215 int MethodArityHistogram::_max_arity; 2216 int MethodArityHistogram::_max_size; 2217 2218 void SharedRuntime::print_call_statistics(int comp_total) { 2219 tty->print_cr("Calls from compiled code:"); 2220 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls; 2221 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls; 2222 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls; 2223 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total)); 2224 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total)); 2225 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls)); 2226 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls)); 2227 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls)); 2228 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls)); 2229 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total)); 2230 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls)); 2231 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls)); 2232 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls)); 2233 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls)); 2234 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total)); 2235 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls)); 2236 tty->cr(); 2237 tty->print_cr("Note 1: counter updates are not MT-safe."); 2238 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;"); 2239 tty->print_cr(" %% in nested categories are relative to their category"); 2240 tty->print_cr(" (and thus add up to more than 100%% with inlining)"); 2241 tty->cr(); 2242 2243 MethodArityHistogram h; 2244 } 2245 #endif 2246 2247 2248 // A simple wrapper class around the calling convention information 2249 // that allows sharing of adapters for the same calling convention. 2250 class AdapterFingerPrint : public CHeapObj<mtCode> { 2251 private: 2252 enum { 2253 _basic_type_bits = 4, 2254 _basic_type_mask = right_n_bits(_basic_type_bits), 2255 _basic_types_per_int = BitsPerInt / _basic_type_bits, 2256 _compact_int_count = 3 2257 }; 2258 // TO DO: Consider integrating this with a more global scheme for compressing signatures. 2259 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive. 2260 2261 union { 2262 int _compact[_compact_int_count]; 2263 int* _fingerprint; 2264 } _value; 2265 int _length; // A negative length indicates the fingerprint is in the compact form, 2266 // Otherwise _value._fingerprint is the array. 2267 2268 // Remap BasicTypes that are handled equivalently by the adapters. 2269 // These are correct for the current system but someday it might be 2270 // necessary to make this mapping platform dependent. 2271 static int adapter_encoding(BasicType in) { 2272 switch (in) { 2273 case T_BOOLEAN: 2274 case T_BYTE: 2275 case T_SHORT: 2276 case T_CHAR: 2277 // There are all promoted to T_INT in the calling convention 2278 return T_INT; 2279 2280 case T_OBJECT: 2281 case T_ARRAY: 2282 // In other words, we assume that any register good enough for 2283 // an int or long is good enough for a managed pointer. 2284 #ifdef _LP64 2285 return T_LONG; 2286 #else 2287 return T_INT; 2288 #endif 2289 2290 case T_INT: 2291 case T_LONG: 2292 case T_FLOAT: 2293 case T_DOUBLE: 2294 case T_VOID: 2295 return in; 2296 2297 default: 2298 ShouldNotReachHere(); 2299 return T_CONFLICT; 2300 } 2301 } 2302 2303 public: 2304 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) { 2305 // The fingerprint is based on the BasicType signature encoded 2306 // into an array of ints with eight entries per int. 2307 int* ptr; 2308 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int; 2309 if (len <= _compact_int_count) { 2310 assert(_compact_int_count == 3, "else change next line"); 2311 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0; 2312 // Storing the signature encoded as signed chars hits about 98% 2313 // of the time. 2314 _length = -len; 2315 ptr = _value._compact; 2316 } else { 2317 _length = len; 2318 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode); 2319 ptr = _value._fingerprint; 2320 } 2321 2322 // Now pack the BasicTypes with 8 per int 2323 int sig_index = 0; 2324 for (int index = 0; index < len; index++) { 2325 int value = 0; 2326 for (int byte = 0; byte < _basic_types_per_int; byte++) { 2327 int bt = ((sig_index < total_args_passed) 2328 ? adapter_encoding(sig_bt[sig_index++]) 2329 : 0); 2330 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits"); 2331 value = (value << _basic_type_bits) | bt; 2332 } 2333 ptr[index] = value; 2334 } 2335 } 2336 2337 ~AdapterFingerPrint() { 2338 if (_length > 0) { 2339 FREE_C_HEAP_ARRAY(int, _value._fingerprint); 2340 } 2341 } 2342 2343 int value(int index) { 2344 if (_length < 0) { 2345 return _value._compact[index]; 2346 } 2347 return _value._fingerprint[index]; 2348 } 2349 int length() { 2350 if (_length < 0) return -_length; 2351 return _length; 2352 } 2353 2354 bool is_compact() { 2355 return _length <= 0; 2356 } 2357 2358 unsigned int compute_hash() { 2359 int hash = 0; 2360 for (int i = 0; i < length(); i++) { 2361 int v = value(i); 2362 hash = (hash << 8) ^ v ^ (hash >> 5); 2363 } 2364 return (unsigned int)hash; 2365 } 2366 2367 const char* as_string() { 2368 stringStream st; 2369 st.print("0x"); 2370 for (int i = 0; i < length(); i++) { 2371 st.print("%08x", value(i)); 2372 } 2373 return st.as_string(); 2374 } 2375 2376 bool equals(AdapterFingerPrint* other) { 2377 if (other->_length != _length) { 2378 return false; 2379 } 2380 if (_length < 0) { 2381 assert(_compact_int_count == 3, "else change next line"); 2382 return _value._compact[0] == other->_value._compact[0] && 2383 _value._compact[1] == other->_value._compact[1] && 2384 _value._compact[2] == other->_value._compact[2]; 2385 } else { 2386 for (int i = 0; i < _length; i++) { 2387 if (_value._fingerprint[i] != other->_value._fingerprint[i]) { 2388 return false; 2389 } 2390 } 2391 } 2392 return true; 2393 } 2394 }; 2395 2396 2397 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries 2398 class AdapterHandlerTable : public BasicHashtable<mtCode> { 2399 friend class AdapterHandlerTableIterator; 2400 2401 private: 2402 2403 #ifndef PRODUCT 2404 static int _lookups; // number of calls to lookup 2405 static int _buckets; // number of buckets checked 2406 static int _equals; // number of buckets checked with matching hash 2407 static int _hits; // number of successful lookups 2408 static int _compact; // number of equals calls with compact signature 2409 #endif 2410 2411 AdapterHandlerEntry* bucket(int i) { 2412 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i); 2413 } 2414 2415 public: 2416 AdapterHandlerTable() 2417 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { } 2418 2419 // Create a new entry suitable for insertion in the table 2420 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 2421 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash()); 2422 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2423 if (DumpSharedSpaces) { 2424 ((CDSAdapterHandlerEntry*)entry)->init(); 2425 } 2426 return entry; 2427 } 2428 2429 // Insert an entry into the table 2430 void add(AdapterHandlerEntry* entry) { 2431 int index = hash_to_index(entry->hash()); 2432 add_entry(index, entry); 2433 } 2434 2435 void free_entry(AdapterHandlerEntry* entry) { 2436 entry->deallocate(); 2437 BasicHashtable<mtCode>::free_entry(entry); 2438 } 2439 2440 // Find a entry with the same fingerprint if it exists 2441 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) { 2442 NOT_PRODUCT(_lookups++); 2443 AdapterFingerPrint fp(total_args_passed, sig_bt); 2444 unsigned int hash = fp.compute_hash(); 2445 int index = hash_to_index(hash); 2446 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2447 NOT_PRODUCT(_buckets++); 2448 if (e->hash() == hash) { 2449 NOT_PRODUCT(_equals++); 2450 if (fp.equals(e->fingerprint())) { 2451 #ifndef PRODUCT 2452 if (fp.is_compact()) _compact++; 2453 _hits++; 2454 #endif 2455 return e; 2456 } 2457 } 2458 } 2459 return NULL; 2460 } 2461 2462 #ifndef PRODUCT 2463 void print_statistics() { 2464 ResourceMark rm; 2465 int longest = 0; 2466 int empty = 0; 2467 int total = 0; 2468 int nonempty = 0; 2469 for (int index = 0; index < table_size(); index++) { 2470 int count = 0; 2471 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2472 count++; 2473 } 2474 if (count != 0) nonempty++; 2475 if (count == 0) empty++; 2476 if (count > longest) longest = count; 2477 total += count; 2478 } 2479 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f", 2480 empty, longest, total, total / (double)nonempty); 2481 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d", 2482 _lookups, _buckets, _equals, _hits, _compact); 2483 } 2484 #endif 2485 }; 2486 2487 2488 #ifndef PRODUCT 2489 2490 int AdapterHandlerTable::_lookups; 2491 int AdapterHandlerTable::_buckets; 2492 int AdapterHandlerTable::_equals; 2493 int AdapterHandlerTable::_hits; 2494 int AdapterHandlerTable::_compact; 2495 2496 #endif 2497 2498 class AdapterHandlerTableIterator : public StackObj { 2499 private: 2500 AdapterHandlerTable* _table; 2501 int _index; 2502 AdapterHandlerEntry* _current; 2503 2504 void scan() { 2505 while (_index < _table->table_size()) { 2506 AdapterHandlerEntry* a = _table->bucket(_index); 2507 _index++; 2508 if (a != NULL) { 2509 _current = a; 2510 return; 2511 } 2512 } 2513 } 2514 2515 public: 2516 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) { 2517 scan(); 2518 } 2519 bool has_next() { 2520 return _current != NULL; 2521 } 2522 AdapterHandlerEntry* next() { 2523 if (_current != NULL) { 2524 AdapterHandlerEntry* result = _current; 2525 _current = _current->next(); 2526 if (_current == NULL) scan(); 2527 return result; 2528 } else { 2529 return NULL; 2530 } 2531 } 2532 }; 2533 2534 2535 // --------------------------------------------------------------------------- 2536 // Implementation of AdapterHandlerLibrary 2537 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL; 2538 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL; 2539 const int AdapterHandlerLibrary_size = 16*K; 2540 BufferBlob* AdapterHandlerLibrary::_buffer = NULL; 2541 2542 BufferBlob* AdapterHandlerLibrary::buffer_blob() { 2543 // Should be called only when AdapterHandlerLibrary_lock is active. 2544 if (_buffer == NULL) // Initialize lazily 2545 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size); 2546 return _buffer; 2547 } 2548 2549 extern "C" void unexpected_adapter_call() { 2550 ShouldNotCallThis(); 2551 } 2552 2553 void AdapterHandlerLibrary::initialize() { 2554 if (_adapters != NULL) return; 2555 _adapters = new AdapterHandlerTable(); 2556 2557 // Create a special handler for abstract methods. Abstract methods 2558 // are never compiled so an i2c entry is somewhat meaningless, but 2559 // throw AbstractMethodError just in case. 2560 // Pass wrong_method_abstract for the c2i transitions to return 2561 // AbstractMethodError for invalid invocations. 2562 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub(); 2563 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL), 2564 StubRoutines::throw_AbstractMethodError_entry(), 2565 wrong_method_abstract, wrong_method_abstract); 2566 } 2567 2568 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint, 2569 address i2c_entry, 2570 address c2i_entry, 2571 address c2i_unverified_entry) { 2572 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2573 } 2574 2575 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) { 2576 AdapterHandlerEntry* entry = get_adapter0(method); 2577 if (method->is_shared()) { 2578 // See comments around Method::link_method() 2579 MutexLocker mu(AdapterHandlerLibrary_lock); 2580 if (method->adapter() == NULL) { 2581 method->update_adapter_trampoline(entry); 2582 } 2583 address trampoline = method->from_compiled_entry(); 2584 if (*(int*)trampoline == 0) { 2585 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size()); 2586 MacroAssembler _masm(&buffer); 2587 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry()); 2588 assert(*(int*)trampoline != 0, "Instruction(s) for trampoline must not be encoded as zeros."); 2589 2590 if (PrintInterpreter) { 2591 Disassembler::decode(buffer.insts_begin(), buffer.insts_end()); 2592 } 2593 } 2594 } 2595 2596 return entry; 2597 } 2598 2599 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) { 2600 // Use customized signature handler. Need to lock around updates to 2601 // the AdapterHandlerTable (it is not safe for concurrent readers 2602 // and a single writer: this could be fixed if it becomes a 2603 // problem). 2604 2605 ResourceMark rm; 2606 2607 NOT_PRODUCT(int insts_size); 2608 AdapterBlob* new_adapter = NULL; 2609 AdapterHandlerEntry* entry = NULL; 2610 AdapterFingerPrint* fingerprint = NULL; 2611 { 2612 MutexLocker mu(AdapterHandlerLibrary_lock); 2613 // make sure data structure is initialized 2614 initialize(); 2615 2616 if (method->is_abstract()) { 2617 return _abstract_method_handler; 2618 } 2619 2620 // Fill in the signature array, for the calling-convention call. 2621 int total_args_passed = method->size_of_parameters(); // All args on stack 2622 2623 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2624 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2625 int i = 0; 2626 if (!method->is_static()) // Pass in receiver first 2627 sig_bt[i++] = T_OBJECT; 2628 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) { 2629 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2630 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2631 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2632 } 2633 assert(i == total_args_passed, ""); 2634 2635 // Lookup method signature's fingerprint 2636 entry = _adapters->lookup(total_args_passed, sig_bt); 2637 2638 #ifdef ASSERT 2639 AdapterHandlerEntry* shared_entry = NULL; 2640 // Start adapter sharing verification only after the VM is booted. 2641 if (VerifyAdapterSharing && (entry != NULL)) { 2642 shared_entry = entry; 2643 entry = NULL; 2644 } 2645 #endif 2646 2647 if (entry != NULL) { 2648 return entry; 2649 } 2650 2651 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage 2652 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); 2653 2654 // Make a C heap allocated version of the fingerprint to store in the adapter 2655 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt); 2656 2657 // StubRoutines::code2() is initialized after this function can be called. As a result, 2658 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated 2659 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C 2660 // stub that ensure that an I2C stub is called from an interpreter frame. 2661 bool contains_all_checks = StubRoutines::code2() != NULL; 2662 2663 // Create I2C & C2I handlers 2664 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2665 if (buf != NULL) { 2666 CodeBuffer buffer(buf); 2667 short buffer_locs[20]; 2668 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs, 2669 sizeof(buffer_locs)/sizeof(relocInfo)); 2670 2671 MacroAssembler _masm(&buffer); 2672 entry = SharedRuntime::generate_i2c2i_adapters(&_masm, 2673 total_args_passed, 2674 comp_args_on_stack, 2675 sig_bt, 2676 regs, 2677 fingerprint); 2678 #ifdef ASSERT 2679 if (VerifyAdapterSharing) { 2680 if (shared_entry != NULL) { 2681 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match"); 2682 // Release the one just created and return the original 2683 _adapters->free_entry(entry); 2684 return shared_entry; 2685 } else { 2686 entry->save_code(buf->code_begin(), buffer.insts_size()); 2687 } 2688 } 2689 #endif 2690 2691 new_adapter = AdapterBlob::create(&buffer); 2692 NOT_PRODUCT(insts_size = buffer.insts_size()); 2693 } 2694 if (new_adapter == NULL) { 2695 // CodeCache is full, disable compilation 2696 // Ought to log this but compile log is only per compile thread 2697 // and we're some non descript Java thread. 2698 return NULL; // Out of CodeCache space 2699 } 2700 entry->relocate(new_adapter->content_begin()); 2701 #ifndef PRODUCT 2702 // debugging suppport 2703 if (PrintAdapterHandlers || PrintStubCode) { 2704 ttyLocker ttyl; 2705 entry->print_adapter_on(tty); 2706 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)", 2707 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"), 2708 method->signature()->as_C_string(), fingerprint->as_string(), insts_size); 2709 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry()); 2710 if (Verbose || PrintStubCode) { 2711 address first_pc = entry->base_address(); 2712 if (first_pc != NULL) { 2713 Disassembler::decode(first_pc, first_pc + insts_size); 2714 tty->cr(); 2715 } 2716 } 2717 } 2718 #endif 2719 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp) 2720 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified. 2721 if (contains_all_checks || !VerifyAdapterCalls) { 2722 _adapters->add(entry); 2723 } 2724 } 2725 // Outside of the lock 2726 if (new_adapter != NULL) { 2727 char blob_id[256]; 2728 jio_snprintf(blob_id, 2729 sizeof(blob_id), 2730 "%s(%s)@" PTR_FORMAT, 2731 new_adapter->name(), 2732 fingerprint->as_string(), 2733 new_adapter->content_begin()); 2734 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end()); 2735 2736 if (JvmtiExport::should_post_dynamic_code_generated()) { 2737 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end()); 2738 } 2739 } 2740 return entry; 2741 } 2742 2743 address AdapterHandlerEntry::base_address() { 2744 address base = _i2c_entry; 2745 if (base == NULL) base = _c2i_entry; 2746 assert(base <= _c2i_entry || _c2i_entry == NULL, ""); 2747 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, ""); 2748 return base; 2749 } 2750 2751 void AdapterHandlerEntry::relocate(address new_base) { 2752 address old_base = base_address(); 2753 assert(old_base != NULL, ""); 2754 ptrdiff_t delta = new_base - old_base; 2755 if (_i2c_entry != NULL) 2756 _i2c_entry += delta; 2757 if (_c2i_entry != NULL) 2758 _c2i_entry += delta; 2759 if (_c2i_unverified_entry != NULL) 2760 _c2i_unverified_entry += delta; 2761 assert(base_address() == new_base, ""); 2762 } 2763 2764 2765 void AdapterHandlerEntry::deallocate() { 2766 delete _fingerprint; 2767 #ifdef ASSERT 2768 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code); 2769 #endif 2770 } 2771 2772 2773 #ifdef ASSERT 2774 // Capture the code before relocation so that it can be compared 2775 // against other versions. If the code is captured after relocation 2776 // then relative instructions won't be equivalent. 2777 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) { 2778 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode); 2779 _saved_code_length = length; 2780 memcpy(_saved_code, buffer, length); 2781 } 2782 2783 2784 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) { 2785 if (length != _saved_code_length) { 2786 return false; 2787 } 2788 2789 return (memcmp(buffer, _saved_code, length) == 0) ? true : false; 2790 } 2791 #endif 2792 2793 2794 /** 2795 * Create a native wrapper for this native method. The wrapper converts the 2796 * Java-compiled calling convention to the native convention, handles 2797 * arguments, and transitions to native. On return from the native we transition 2798 * back to java blocking if a safepoint is in progress. 2799 */ 2800 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) { 2801 ResourceMark rm; 2802 nmethod* nm = NULL; 2803 2804 assert(method->is_native(), "must be native"); 2805 assert(method->is_method_handle_intrinsic() || 2806 method->has_native_function(), "must have something valid to call!"); 2807 2808 { 2809 // Perform the work while holding the lock, but perform any printing outside the lock 2810 MutexLocker mu(AdapterHandlerLibrary_lock); 2811 // See if somebody beat us to it 2812 if (method->code() != NULL) { 2813 return; 2814 } 2815 2816 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci); 2817 assert(compile_id > 0, "Must generate native wrapper"); 2818 2819 2820 ResourceMark rm; 2821 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2822 if (buf != NULL) { 2823 CodeBuffer buffer(buf); 2824 double locs_buf[20]; 2825 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); 2826 MacroAssembler _masm(&buffer); 2827 2828 // Fill in the signature array, for the calling-convention call. 2829 const int total_args_passed = method->size_of_parameters(); 2830 2831 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2832 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2833 int i=0; 2834 if (!method->is_static()) // Pass in receiver first 2835 sig_bt[i++] = T_OBJECT; 2836 SignatureStream ss(method->signature()); 2837 for (; !ss.at_return_type(); ss.next()) { 2838 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2839 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2840 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2841 } 2842 assert(i == total_args_passed, ""); 2843 BasicType ret_type = ss.type(); 2844 2845 // Now get the compiled-Java layout as input (or output) arguments. 2846 // NOTE: Stubs for compiled entry points of method handle intrinsics 2847 // are just trampolines so the argument registers must be outgoing ones. 2848 const bool is_outgoing = method->is_method_handle_intrinsic(); 2849 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing); 2850 2851 // Generate the compiled-to-native wrapper code 2852 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type); 2853 2854 if (nm != NULL) { 2855 method->set_code(method, nm); 2856 2857 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple)); 2858 if (directive->PrintAssemblyOption) { 2859 nm->print_code(); 2860 } 2861 DirectivesStack::release(directive); 2862 } 2863 } 2864 } // Unlock AdapterHandlerLibrary_lock 2865 2866 2867 // Install the generated code. 2868 if (nm != NULL) { 2869 const char *msg = method->is_static() ? "(static)" : ""; 2870 CompileTask::print_ul(nm, msg); 2871 if (PrintCompilation) { 2872 ttyLocker ttyl; 2873 CompileTask::print(tty, nm, msg); 2874 } 2875 nm->post_compiled_method_load_event(); 2876 } 2877 } 2878 2879 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread)) 2880 assert(thread == JavaThread::current(), "must be"); 2881 // The code is about to enter a JNI lazy critical native method and 2882 // _needs_gc is true, so if this thread is already in a critical 2883 // section then just return, otherwise this thread should block 2884 // until needs_gc has been cleared. 2885 if (thread->in_critical()) { 2886 return; 2887 } 2888 // Lock and unlock a critical section to give the system a chance to block 2889 GCLocker::lock_critical(thread); 2890 GCLocker::unlock_critical(thread); 2891 JRT_END 2892 2893 JRT_LEAF(oopDesc*, SharedRuntime::pin_object(JavaThread* thread, oopDesc* obj)) 2894 assert(Universe::heap()->supports_object_pinning(), "Why we are here?"); 2895 assert(obj != NULL, "Should not be null"); 2896 oop o(obj); 2897 o = Universe::heap()->pin_object(thread, o); 2898 assert(o != NULL, "Should not be null"); 2899 return o; 2900 JRT_END 2901 2902 JRT_LEAF(void, SharedRuntime::unpin_object(JavaThread* thread, oopDesc* obj)) 2903 assert(Universe::heap()->supports_object_pinning(), "Why we are here?"); 2904 assert(obj != NULL, "Should not be null"); 2905 oop o(obj); 2906 Universe::heap()->unpin_object(thread, o); 2907 JRT_END 2908 2909 // ------------------------------------------------------------------------- 2910 // Java-Java calling convention 2911 // (what you use when Java calls Java) 2912 2913 //------------------------------name_for_receiver---------------------------------- 2914 // For a given signature, return the VMReg for parameter 0. 2915 VMReg SharedRuntime::name_for_receiver() { 2916 VMRegPair regs; 2917 BasicType sig_bt = T_OBJECT; 2918 (void) java_calling_convention(&sig_bt, ®s, 1, true); 2919 // Return argument 0 register. In the LP64 build pointers 2920 // take 2 registers, but the VM wants only the 'main' name. 2921 return regs.first(); 2922 } 2923 2924 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) { 2925 // This method is returning a data structure allocating as a 2926 // ResourceObject, so do not put any ResourceMarks in here. 2927 char *s = sig->as_C_string(); 2928 int len = (int)strlen(s); 2929 s++; len--; // Skip opening paren 2930 2931 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256); 2932 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256); 2933 int cnt = 0; 2934 if (has_receiver) { 2935 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature 2936 } 2937 2938 while (*s != ')') { // Find closing right paren 2939 switch (*s++) { // Switch on signature character 2940 case 'B': sig_bt[cnt++] = T_BYTE; break; 2941 case 'C': sig_bt[cnt++] = T_CHAR; break; 2942 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break; 2943 case 'F': sig_bt[cnt++] = T_FLOAT; break; 2944 case 'I': sig_bt[cnt++] = T_INT; break; 2945 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break; 2946 case 'S': sig_bt[cnt++] = T_SHORT; break; 2947 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break; 2948 case 'V': sig_bt[cnt++] = T_VOID; break; 2949 case 'L': // Oop 2950 while (*s++ != ';'); // Skip signature 2951 sig_bt[cnt++] = T_OBJECT; 2952 break; 2953 case '[': { // Array 2954 do { // Skip optional size 2955 while (*s >= '0' && *s <= '9') s++; 2956 } while (*s++ == '['); // Nested arrays? 2957 // Skip element type 2958 if (s[-1] == 'L') 2959 while (*s++ != ';'); // Skip signature 2960 sig_bt[cnt++] = T_ARRAY; 2961 break; 2962 } 2963 default : ShouldNotReachHere(); 2964 } 2965 } 2966 2967 if (has_appendix) { 2968 sig_bt[cnt++] = T_OBJECT; 2969 } 2970 2971 assert(cnt < 256, "grow table size"); 2972 2973 int comp_args_on_stack; 2974 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true); 2975 2976 // the calling convention doesn't count out_preserve_stack_slots so 2977 // we must add that in to get "true" stack offsets. 2978 2979 if (comp_args_on_stack) { 2980 for (int i = 0; i < cnt; i++) { 2981 VMReg reg1 = regs[i].first(); 2982 if (reg1->is_stack()) { 2983 // Yuck 2984 reg1 = reg1->bias(out_preserve_stack_slots()); 2985 } 2986 VMReg reg2 = regs[i].second(); 2987 if (reg2->is_stack()) { 2988 // Yuck 2989 reg2 = reg2->bias(out_preserve_stack_slots()); 2990 } 2991 regs[i].set_pair(reg2, reg1); 2992 } 2993 } 2994 2995 // results 2996 *arg_size = cnt; 2997 return regs; 2998 } 2999 3000 // OSR Migration Code 3001 // 3002 // This code is used convert interpreter frames into compiled frames. It is 3003 // called from very start of a compiled OSR nmethod. A temp array is 3004 // allocated to hold the interesting bits of the interpreter frame. All 3005 // active locks are inflated to allow them to move. The displaced headers and 3006 // active interpreter locals are copied into the temp buffer. Then we return 3007 // back to the compiled code. The compiled code then pops the current 3008 // interpreter frame off the stack and pushes a new compiled frame. Then it 3009 // copies the interpreter locals and displaced headers where it wants. 3010 // Finally it calls back to free the temp buffer. 3011 // 3012 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed. 3013 3014 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) ) 3015 3016 // 3017 // This code is dependent on the memory layout of the interpreter local 3018 // array and the monitors. On all of our platforms the layout is identical 3019 // so this code is shared. If some platform lays the their arrays out 3020 // differently then this code could move to platform specific code or 3021 // the code here could be modified to copy items one at a time using 3022 // frame accessor methods and be platform independent. 3023 3024 frame fr = thread->last_frame(); 3025 assert(fr.is_interpreted_frame(), ""); 3026 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks"); 3027 3028 // Figure out how many monitors are active. 3029 int active_monitor_count = 0; 3030 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 3031 kptr < fr.interpreter_frame_monitor_begin(); 3032 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 3033 if (kptr->obj() != NULL) active_monitor_count++; 3034 } 3035 3036 // QQQ we could place number of active monitors in the array so that compiled code 3037 // could double check it. 3038 3039 Method* moop = fr.interpreter_frame_method(); 3040 int max_locals = moop->max_locals(); 3041 // Allocate temp buffer, 1 word per local & 2 per active monitor 3042 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size(); 3043 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode); 3044 3045 // Copy the locals. Order is preserved so that loading of longs works. 3046 // Since there's no GC I can copy the oops blindly. 3047 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code"); 3048 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1), 3049 (HeapWord*)&buf[0], 3050 max_locals); 3051 3052 // Inflate locks. Copy the displaced headers. Be careful, there can be holes. 3053 int i = max_locals; 3054 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end(); 3055 kptr2 < fr.interpreter_frame_monitor_begin(); 3056 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) { 3057 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array 3058 BasicLock *lock = kptr2->lock(); 3059 // Inflate so the displaced header becomes position-independent 3060 if (lock->displaced_header()->is_unlocked()) 3061 ObjectSynchronizer::inflate_helper(kptr2->obj()); 3062 // Now the displaced header is free to move 3063 buf[i++] = (intptr_t)lock->displaced_header(); 3064 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj()); 3065 } 3066 } 3067 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors"); 3068 3069 return buf; 3070 JRT_END 3071 3072 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) ) 3073 FREE_C_HEAP_ARRAY(intptr_t, buf); 3074 JRT_END 3075 3076 bool AdapterHandlerLibrary::contains(const CodeBlob* b) { 3077 AdapterHandlerTableIterator iter(_adapters); 3078 while (iter.has_next()) { 3079 AdapterHandlerEntry* a = iter.next(); 3080 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true; 3081 } 3082 return false; 3083 } 3084 3085 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) { 3086 AdapterHandlerTableIterator iter(_adapters); 3087 while (iter.has_next()) { 3088 AdapterHandlerEntry* a = iter.next(); 3089 if (b == CodeCache::find_blob(a->get_i2c_entry())) { 3090 st->print("Adapter for signature: "); 3091 a->print_adapter_on(tty); 3092 return; 3093 } 3094 } 3095 assert(false, "Should have found handler"); 3096 } 3097 3098 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const { 3099 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT, 3100 p2i(this), fingerprint()->as_string(), 3101 p2i(get_i2c_entry()), p2i(get_c2i_entry()), p2i(get_c2i_unverified_entry())); 3102 3103 } 3104 3105 #if INCLUDE_CDS 3106 3107 void CDSAdapterHandlerEntry::init() { 3108 assert(DumpSharedSpaces, "used during dump time only"); 3109 _c2i_entry_trampoline = (address)MetaspaceShared::misc_code_space_alloc(SharedRuntime::trampoline_size()); 3110 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_code_space_alloc(sizeof(AdapterHandlerEntry*)); 3111 }; 3112 3113 #endif // INCLUDE_CDS 3114 3115 3116 #ifndef PRODUCT 3117 3118 void AdapterHandlerLibrary::print_statistics() { 3119 _adapters->print_statistics(); 3120 } 3121 3122 #endif /* PRODUCT */ 3123 3124 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread)) 3125 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone"); 3126 if (thread->stack_reserved_zone_disabled()) { 3127 thread->enable_stack_reserved_zone(); 3128 } 3129 thread->set_reserved_stack_activation(thread->stack_base()); 3130 JRT_END 3131 3132 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) { 3133 ResourceMark rm(thread); 3134 frame activation; 3135 CompiledMethod* nm = NULL; 3136 int count = 1; 3137 3138 assert(fr.is_java_frame(), "Must start on Java frame"); 3139 3140 while (true) { 3141 Method* method = NULL; 3142 bool found = false; 3143 if (fr.is_interpreted_frame()) { 3144 method = fr.interpreter_frame_method(); 3145 if (method != NULL && method->has_reserved_stack_access()) { 3146 found = true; 3147 } 3148 } else { 3149 CodeBlob* cb = fr.cb(); 3150 if (cb != NULL && cb->is_compiled()) { 3151 nm = cb->as_compiled_method(); 3152 method = nm->method(); 3153 // scope_desc_near() must be used, instead of scope_desc_at() because on 3154 // SPARC, the pcDesc can be on the delay slot after the call instruction. 3155 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != NULL; sd = sd->sender()) { 3156 method = sd->method(); 3157 if (method != NULL && method->has_reserved_stack_access()) { 3158 found = true; 3159 } 3160 } 3161 } 3162 } 3163 if (found) { 3164 activation = fr; 3165 warning("Potentially dangerous stack overflow in " 3166 "ReservedStackAccess annotated method %s [%d]", 3167 method->name_and_sig_as_C_string(), count++); 3168 EventReservedStackActivation event; 3169 if (event.should_commit()) { 3170 event.set_method(method); 3171 event.commit(); 3172 } 3173 } 3174 if (fr.is_first_java_frame()) { 3175 break; 3176 } else { 3177 fr = fr.java_sender(); 3178 } 3179 } 3180 return activation; 3181 } 3182 3183 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* thread) { 3184 // After any safepoint, just before going back to compiled code, 3185 // we inform the GC that we will be doing initializing writes to 3186 // this object in the future without emitting card-marks, so 3187 // GC may take any compensating steps. 3188 3189 oop new_obj = thread->vm_result(); 3190 if (new_obj == NULL) return; 3191 3192 BarrierSet *bs = BarrierSet::barrier_set(); 3193 bs->on_slowpath_allocation_exit(thread, new_obj); 3194 }