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 "code/compiledMethod.inline.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/compiledIC.hpp" 34 #include "code/scopeDesc.hpp" 35 #include "code/vtableStubs.hpp" 36 #include "compiler/abstractCompiler.hpp" 37 #include "compiler/compileBroker.hpp" 38 #include "compiler/disassembler.hpp" 39 #include "gc/shared/barrierSet.hpp" 40 #include "gc/shared/gcLocker.inline.hpp" 41 #include "interpreter/interpreter.hpp" 42 #include "interpreter/interpreterRuntime.hpp" 43 #include "jfr/jfrEvents.hpp" 44 #include "logging/log.hpp" 45 #include "memory/metaspaceShared.hpp" 46 #include "memory/resourceArea.hpp" 47 #include "memory/universe.hpp" 48 #include "oops/klass.hpp" 49 #include "oops/method.inline.hpp" 50 #include "oops/objArrayKlass.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "prims/forte.hpp" 53 #include "prims/jvmtiExport.hpp" 54 #include "prims/methodHandles.hpp" 55 #include "prims/nativeLookup.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/atomic.hpp" 58 #include "runtime/biasedLocking.hpp" 59 #include "runtime/compilationPolicy.hpp" 60 #include "runtime/frame.inline.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/init.hpp" 63 #include "runtime/interfaceSupport.inline.hpp" 64 #include "runtime/java.hpp" 65 #include "runtime/javaCalls.hpp" 66 #include "runtime/sharedRuntime.hpp" 67 #include "runtime/stubRoutines.hpp" 68 #include "runtime/vframe.inline.hpp" 69 #include "runtime/vframeArray.hpp" 70 #include "utilities/copy.hpp" 71 #include "utilities/dtrace.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/hashtable.inline.hpp" 74 #include "utilities/macros.hpp" 75 #include "utilities/xmlstream.hpp" 76 #ifdef COMPILER1 77 #include "c1/c1_Runtime1.hpp" 78 #endif 79 80 // Shared stub locations 81 RuntimeStub* SharedRuntime::_wrong_method_blob; 82 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob; 83 RuntimeStub* SharedRuntime::_ic_miss_blob; 84 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob; 85 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob; 86 RuntimeStub* SharedRuntime::_resolve_static_call_blob; 87 address SharedRuntime::_resolve_static_call_entry; 88 89 DeoptimizationBlob* SharedRuntime::_deopt_blob; 90 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob; 91 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob; 92 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob; 93 94 #ifdef COMPILER2 95 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob; 96 #endif // COMPILER2 97 98 99 //----------------------------generate_stubs----------------------------------- 100 void SharedRuntime::generate_stubs() { 101 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub"); 102 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub"); 103 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub"); 104 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call"); 105 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call"); 106 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call"); 107 _resolve_static_call_entry = _resolve_static_call_blob->entry_point(); 108 109 #if COMPILER2_OR_JVMCI 110 // Vectors are generated only by C2 and JVMCI. 111 bool support_wide = is_wide_vector(MaxVectorSize); 112 if (support_wide) { 113 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP); 114 } 115 #endif // COMPILER2_OR_JVMCI 116 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP); 117 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN); 118 119 generate_deopt_blob(); 120 121 #ifdef COMPILER2 122 generate_uncommon_trap_blob(); 123 #endif // COMPILER2 124 } 125 126 #include <math.h> 127 128 // Implementation of SharedRuntime 129 130 #ifndef PRODUCT 131 // For statistics 132 int SharedRuntime::_ic_miss_ctr = 0; 133 int SharedRuntime::_wrong_method_ctr = 0; 134 int SharedRuntime::_resolve_static_ctr = 0; 135 int SharedRuntime::_resolve_virtual_ctr = 0; 136 int SharedRuntime::_resolve_opt_virtual_ctr = 0; 137 int SharedRuntime::_implicit_null_throws = 0; 138 int SharedRuntime::_implicit_div0_throws = 0; 139 int SharedRuntime::_throw_null_ctr = 0; 140 141 int SharedRuntime::_nof_normal_calls = 0; 142 int SharedRuntime::_nof_optimized_calls = 0; 143 int SharedRuntime::_nof_inlined_calls = 0; 144 int SharedRuntime::_nof_megamorphic_calls = 0; 145 int SharedRuntime::_nof_static_calls = 0; 146 int SharedRuntime::_nof_inlined_static_calls = 0; 147 int SharedRuntime::_nof_interface_calls = 0; 148 int SharedRuntime::_nof_optimized_interface_calls = 0; 149 int SharedRuntime::_nof_inlined_interface_calls = 0; 150 int SharedRuntime::_nof_megamorphic_interface_calls = 0; 151 int SharedRuntime::_nof_removable_exceptions = 0; 152 153 int SharedRuntime::_new_instance_ctr=0; 154 int SharedRuntime::_new_array_ctr=0; 155 int SharedRuntime::_multi1_ctr=0; 156 int SharedRuntime::_multi2_ctr=0; 157 int SharedRuntime::_multi3_ctr=0; 158 int SharedRuntime::_multi4_ctr=0; 159 int SharedRuntime::_multi5_ctr=0; 160 int SharedRuntime::_mon_enter_stub_ctr=0; 161 int SharedRuntime::_mon_exit_stub_ctr=0; 162 int SharedRuntime::_mon_enter_ctr=0; 163 int SharedRuntime::_mon_exit_ctr=0; 164 int SharedRuntime::_partial_subtype_ctr=0; 165 int SharedRuntime::_jbyte_array_copy_ctr=0; 166 int SharedRuntime::_jshort_array_copy_ctr=0; 167 int SharedRuntime::_jint_array_copy_ctr=0; 168 int SharedRuntime::_jlong_array_copy_ctr=0; 169 int SharedRuntime::_oop_array_copy_ctr=0; 170 int SharedRuntime::_checkcast_array_copy_ctr=0; 171 int SharedRuntime::_unsafe_array_copy_ctr=0; 172 int SharedRuntime::_generic_array_copy_ctr=0; 173 int SharedRuntime::_slow_array_copy_ctr=0; 174 int SharedRuntime::_find_handler_ctr=0; 175 int SharedRuntime::_rethrow_ctr=0; 176 177 int SharedRuntime::_ICmiss_index = 0; 178 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count]; 179 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count]; 180 181 182 void SharedRuntime::trace_ic_miss(address at) { 183 for (int i = 0; i < _ICmiss_index; i++) { 184 if (_ICmiss_at[i] == at) { 185 _ICmiss_count[i]++; 186 return; 187 } 188 } 189 int index = _ICmiss_index++; 190 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1; 191 _ICmiss_at[index] = at; 192 _ICmiss_count[index] = 1; 193 } 194 195 void SharedRuntime::print_ic_miss_histogram() { 196 if (ICMissHistogram) { 197 tty->print_cr("IC Miss Histogram:"); 198 int tot_misses = 0; 199 for (int i = 0; i < _ICmiss_index; i++) { 200 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]); 201 tot_misses += _ICmiss_count[i]; 202 } 203 tty->print_cr("Total IC misses: %7d", tot_misses); 204 } 205 } 206 #endif // PRODUCT 207 208 209 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x)) 210 return x * y; 211 JRT_END 212 213 214 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x)) 215 if (x == min_jlong && y == CONST64(-1)) { 216 return x; 217 } else { 218 return x / y; 219 } 220 JRT_END 221 222 223 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x)) 224 if (x == min_jlong && y == CONST64(-1)) { 225 return 0; 226 } else { 227 return x % y; 228 } 229 JRT_END 230 231 232 const juint float_sign_mask = 0x7FFFFFFF; 233 const juint float_infinity = 0x7F800000; 234 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF); 235 const julong double_infinity = CONST64(0x7FF0000000000000); 236 237 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y)) 238 #ifdef _WIN64 239 // 64-bit Windows on amd64 returns the wrong values for 240 // infinity operands. 241 union { jfloat f; juint i; } xbits, ybits; 242 xbits.f = x; 243 ybits.f = y; 244 // x Mod Infinity == x unless x is infinity 245 if (((xbits.i & float_sign_mask) != float_infinity) && 246 ((ybits.i & float_sign_mask) == float_infinity) ) { 247 return x; 248 } 249 return ((jfloat)fmod_winx64((double)x, (double)y)); 250 #else 251 return ((jfloat)fmod((double)x,(double)y)); 252 #endif 253 JRT_END 254 255 256 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y)) 257 #ifdef _WIN64 258 union { jdouble d; julong l; } xbits, ybits; 259 xbits.d = x; 260 ybits.d = y; 261 // x Mod Infinity == x unless x is infinity 262 if (((xbits.l & double_sign_mask) != double_infinity) && 263 ((ybits.l & double_sign_mask) == double_infinity) ) { 264 return x; 265 } 266 return ((jdouble)fmod_winx64((double)x, (double)y)); 267 #else 268 return ((jdouble)fmod((double)x,(double)y)); 269 #endif 270 JRT_END 271 272 #ifdef __SOFTFP__ 273 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y)) 274 return x + y; 275 JRT_END 276 277 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y)) 278 return x - y; 279 JRT_END 280 281 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y)) 282 return x * y; 283 JRT_END 284 285 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y)) 286 return x / y; 287 JRT_END 288 289 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y)) 290 return x + y; 291 JRT_END 292 293 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y)) 294 return x - y; 295 JRT_END 296 297 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y)) 298 return x * y; 299 JRT_END 300 301 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y)) 302 return x / y; 303 JRT_END 304 305 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x)) 306 return (jfloat)x; 307 JRT_END 308 309 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x)) 310 return (jdouble)x; 311 JRT_END 312 313 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x)) 314 return (jdouble)x; 315 JRT_END 316 317 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y)) 318 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/ 319 JRT_END 320 321 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y)) 322 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 323 JRT_END 324 325 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y)) 326 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */ 327 JRT_END 328 329 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y)) 330 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 331 JRT_END 332 333 // Functions to return the opposite of the aeabi functions for nan. 334 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y)) 335 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 336 JRT_END 337 338 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y)) 339 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 340 JRT_END 341 342 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y)) 343 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 344 JRT_END 345 346 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y)) 347 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 348 JRT_END 349 350 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y)) 351 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 352 JRT_END 353 354 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y)) 355 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 356 JRT_END 357 358 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y)) 359 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 360 JRT_END 361 362 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y)) 363 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 364 JRT_END 365 366 // Intrinsics make gcc generate code for these. 367 float SharedRuntime::fneg(float f) { 368 return -f; 369 } 370 371 double SharedRuntime::dneg(double f) { 372 return -f; 373 } 374 375 #endif // __SOFTFP__ 376 377 #if defined(__SOFTFP__) || defined(E500V2) 378 // Intrinsics make gcc generate code for these. 379 double SharedRuntime::dabs(double f) { 380 return (f <= (double)0.0) ? (double)0.0 - f : f; 381 } 382 383 #endif 384 385 #if defined(__SOFTFP__) || defined(PPC) 386 double SharedRuntime::dsqrt(double f) { 387 return sqrt(f); 388 } 389 #endif 390 391 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x)) 392 if (g_isnan(x)) 393 return 0; 394 if (x >= (jfloat) max_jint) 395 return max_jint; 396 if (x <= (jfloat) min_jint) 397 return min_jint; 398 return (jint) x; 399 JRT_END 400 401 402 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x)) 403 if (g_isnan(x)) 404 return 0; 405 if (x >= (jfloat) max_jlong) 406 return max_jlong; 407 if (x <= (jfloat) min_jlong) 408 return min_jlong; 409 return (jlong) x; 410 JRT_END 411 412 413 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x)) 414 if (g_isnan(x)) 415 return 0; 416 if (x >= (jdouble) max_jint) 417 return max_jint; 418 if (x <= (jdouble) min_jint) 419 return min_jint; 420 return (jint) x; 421 JRT_END 422 423 424 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x)) 425 if (g_isnan(x)) 426 return 0; 427 if (x >= (jdouble) max_jlong) 428 return max_jlong; 429 if (x <= (jdouble) min_jlong) 430 return min_jlong; 431 return (jlong) x; 432 JRT_END 433 434 435 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x)) 436 return (jfloat)x; 437 JRT_END 438 439 440 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x)) 441 return (jfloat)x; 442 JRT_END 443 444 445 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x)) 446 return (jdouble)x; 447 JRT_END 448 449 // Exception handling across interpreter/compiler boundaries 450 // 451 // exception_handler_for_return_address(...) returns the continuation address. 452 // The continuation address is the entry point of the exception handler of the 453 // previous frame depending on the return address. 454 455 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) { 456 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address)); 457 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?"); 458 459 // Reset method handle flag. 460 thread->set_is_method_handle_return(false); 461 462 #if INCLUDE_JVMCI 463 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear 464 // and other exception handler continuations do not read it 465 thread->set_exception_pc(NULL); 466 #endif // INCLUDE_JVMCI 467 468 // The fastest case first 469 CodeBlob* blob = CodeCache::find_blob(return_address); 470 CompiledMethod* nm = (blob != NULL) ? blob->as_compiled_method_or_null() : NULL; 471 if (nm != NULL) { 472 // Set flag if return address is a method handle call site. 473 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address)); 474 // native nmethods don't have exception handlers 475 assert(!nm->is_native_method(), "no exception handler"); 476 assert(nm->header_begin() != nm->exception_begin(), "no exception handler"); 477 if (nm->is_deopt_pc(return_address)) { 478 // If we come here because of a stack overflow, the stack may be 479 // unguarded. Reguard the stack otherwise if we return to the 480 // deopt blob and the stack bang causes a stack overflow we 481 // crash. 482 bool guard_pages_enabled = thread->stack_guards_enabled(); 483 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); 484 if (thread->reserved_stack_activation() != thread->stack_base()) { 485 thread->set_reserved_stack_activation(thread->stack_base()); 486 } 487 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash"); 488 return SharedRuntime::deopt_blob()->unpack_with_exception(); 489 } else { 490 return nm->exception_begin(); 491 } 492 } 493 494 // Entry code 495 if (StubRoutines::returns_to_call_stub(return_address)) { 496 return StubRoutines::catch_exception_entry(); 497 } 498 // Interpreted code 499 if (Interpreter::contains(return_address)) { 500 return Interpreter::rethrow_exception_entry(); 501 } 502 503 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub"); 504 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!"); 505 506 #ifndef PRODUCT 507 { ResourceMark rm; 508 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address)); 509 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here"); 510 tty->print_cr("b) other problem"); 511 } 512 #endif // PRODUCT 513 514 ShouldNotReachHere(); 515 return NULL; 516 } 517 518 519 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address)) 520 return raw_exception_handler_for_return_address(thread, return_address); 521 JRT_END 522 523 524 address SharedRuntime::get_poll_stub(address pc) { 525 address stub; 526 // Look up the code blob 527 CodeBlob *cb = CodeCache::find_blob(pc); 528 529 // Should be an nmethod 530 guarantee(cb != NULL && cb->is_compiled(), "safepoint polling: pc must refer to an nmethod"); 531 532 // Look up the relocation information 533 assert(((CompiledMethod*)cb)->is_at_poll_or_poll_return(pc), 534 "safepoint polling: type must be poll"); 535 536 #ifdef ASSERT 537 if (!((NativeInstruction*)pc)->is_safepoint_poll()) { 538 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc)); 539 Disassembler::decode(cb); 540 fatal("Only polling locations are used for safepoint"); 541 } 542 #endif 543 544 bool at_poll_return = ((CompiledMethod*)cb)->is_at_poll_return(pc); 545 bool has_wide_vectors = ((CompiledMethod*)cb)->has_wide_vectors(); 546 if (at_poll_return) { 547 assert(SharedRuntime::polling_page_return_handler_blob() != NULL, 548 "polling page return stub not created yet"); 549 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point(); 550 } else if (has_wide_vectors) { 551 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL, 552 "polling page vectors safepoint stub not created yet"); 553 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point(); 554 } else { 555 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL, 556 "polling page safepoint stub not created yet"); 557 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point(); 558 } 559 log_debug(safepoint)("... found polling page %s exception at pc = " 560 INTPTR_FORMAT ", stub =" INTPTR_FORMAT, 561 at_poll_return ? "return" : "loop", 562 (intptr_t)pc, (intptr_t)stub); 563 return stub; 564 } 565 566 567 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) { 568 assert(caller.is_interpreted_frame(), ""); 569 int args_size = ArgumentSizeComputer(sig).size() + 1; 570 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack"); 571 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1)); 572 assert(Universe::heap()->is_in(result) && oopDesc::is_oop(result), "receiver must be an oop"); 573 return result; 574 } 575 576 577 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) { 578 if (JvmtiExport::can_post_on_exceptions()) { 579 vframeStream vfst(thread, true); 580 methodHandle method = methodHandle(thread, vfst.method()); 581 address bcp = method()->bcp_from(vfst.bci()); 582 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception()); 583 } 584 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception); 585 } 586 587 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) { 588 Handle h_exception = Exceptions::new_exception(thread, name, message); 589 throw_and_post_jvmti_exception(thread, h_exception); 590 } 591 592 // The interpreter code to call this tracing function is only 593 // called/generated when UL is on for redefine, class and has the right level 594 // and tags. Since obsolete methods are never compiled, we don't have 595 // to modify the compilers to generate calls to this function. 596 // 597 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry( 598 JavaThread* thread, Method* method)) 599 if (method->is_obsolete()) { 600 // We are calling an obsolete method, but this is not necessarily 601 // an error. Our method could have been redefined just after we 602 // fetched the Method* from the constant pool. 603 ResourceMark rm; 604 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string()); 605 } 606 return 0; 607 JRT_END 608 609 // ret_pc points into caller; we are returning caller's exception handler 610 // for given exception 611 address SharedRuntime::compute_compiled_exc_handler(CompiledMethod* cm, address ret_pc, Handle& exception, 612 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) { 613 assert(cm != NULL, "must exist"); 614 ResourceMark rm; 615 616 #if INCLUDE_JVMCI 617 if (cm->is_compiled_by_jvmci()) { 618 // lookup exception handler for this pc 619 int catch_pco = ret_pc - cm->code_begin(); 620 ExceptionHandlerTable table(cm); 621 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0); 622 if (t != NULL) { 623 return cm->code_begin() + t->pco(); 624 } else { 625 return Deoptimization::deoptimize_for_missing_exception_handler(cm); 626 } 627 } 628 #endif // INCLUDE_JVMCI 629 630 nmethod* nm = cm->as_nmethod(); 631 ScopeDesc* sd = nm->scope_desc_at(ret_pc); 632 // determine handler bci, if any 633 EXCEPTION_MARK; 634 635 int handler_bci = -1; 636 int scope_depth = 0; 637 if (!force_unwind) { 638 int bci = sd->bci(); 639 bool recursive_exception = false; 640 do { 641 bool skip_scope_increment = false; 642 // exception handler lookup 643 Klass* ek = exception->klass(); 644 methodHandle mh(THREAD, sd->method()); 645 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD); 646 if (HAS_PENDING_EXCEPTION) { 647 recursive_exception = true; 648 // We threw an exception while trying to find the exception handler. 649 // Transfer the new exception to the exception handle which will 650 // be set into thread local storage, and do another lookup for an 651 // exception handler for this exception, this time starting at the 652 // BCI of the exception handler which caused the exception to be 653 // thrown (bugs 4307310 and 4546590). Set "exception" reference 654 // argument to ensure that the correct exception is thrown (4870175). 655 recursive_exception_occurred = true; 656 exception = Handle(THREAD, PENDING_EXCEPTION); 657 CLEAR_PENDING_EXCEPTION; 658 if (handler_bci >= 0) { 659 bci = handler_bci; 660 handler_bci = -1; 661 skip_scope_increment = true; 662 } 663 } 664 else { 665 recursive_exception = false; 666 } 667 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) { 668 sd = sd->sender(); 669 if (sd != NULL) { 670 bci = sd->bci(); 671 } 672 ++scope_depth; 673 } 674 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL)); 675 } 676 677 // found handling method => lookup exception handler 678 int catch_pco = ret_pc - nm->code_begin(); 679 680 ExceptionHandlerTable table(nm); 681 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth); 682 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) { 683 // Allow abbreviated catch tables. The idea is to allow a method 684 // to materialize its exceptions without committing to the exact 685 // routing of exceptions. In particular this is needed for adding 686 // a synthetic handler to unlock monitors when inlining 687 // synchronized methods since the unlock path isn't represented in 688 // the bytecodes. 689 t = table.entry_for(catch_pco, -1, 0); 690 } 691 692 #ifdef COMPILER1 693 if (t == NULL && nm->is_compiled_by_c1()) { 694 assert(nm->unwind_handler_begin() != NULL, ""); 695 return nm->unwind_handler_begin(); 696 } 697 #endif 698 699 if (t == NULL) { 700 ttyLocker ttyl; 701 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci); 702 tty->print_cr(" Exception:"); 703 exception->print(); 704 tty->cr(); 705 tty->print_cr(" Compiled exception table :"); 706 table.print(); 707 nm->print_code(); 708 guarantee(false, "missing exception handler"); 709 return NULL; 710 } 711 712 return nm->code_begin() + t->pco(); 713 } 714 715 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread)) 716 // These errors occur only at call sites 717 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError()); 718 JRT_END 719 720 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 721 // These errors occur only at call sites 722 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub"); 723 JRT_END 724 725 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread)) 726 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 727 JRT_END 728 729 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread)) 730 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 731 JRT_END 732 733 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread)) 734 // This entry point is effectively only used for NullPointerExceptions which occur at inline 735 // cache sites (when the callee activation is not yet set up) so we are at a call site 736 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 737 JRT_END 738 739 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread)) 740 throw_StackOverflowError_common(thread, false); 741 JRT_END 742 743 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread)) 744 throw_StackOverflowError_common(thread, true); 745 JRT_END 746 747 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) { 748 // We avoid using the normal exception construction in this case because 749 // it performs an upcall to Java, and we're already out of stack space. 750 Thread* THREAD = thread; 751 Klass* k = SystemDictionary::StackOverflowError_klass(); 752 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK); 753 if (delayed) { 754 java_lang_Throwable::set_message(exception_oop, 755 Universe::delayed_stack_overflow_error_message()); 756 } 757 Handle exception (thread, exception_oop); 758 if (StackTraceInThrowable) { 759 java_lang_Throwable::fill_in_stack_trace(exception); 760 } 761 // Increment counter for hs_err file reporting 762 Atomic::inc(&Exceptions::_stack_overflow_errors); 763 throw_and_post_jvmti_exception(thread, exception); 764 } 765 766 #if INCLUDE_JVMCI 767 address SharedRuntime::deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason) { 768 assert(deopt_reason > Deoptimization::Reason_none && deopt_reason < Deoptimization::Reason_LIMIT, "invalid deopt reason"); 769 thread->set_jvmci_implicit_exception_pc(pc); 770 thread->set_pending_deoptimization(Deoptimization::make_trap_request((Deoptimization::DeoptReason)deopt_reason, Deoptimization::Action_reinterpret)); 771 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap()); 772 } 773 #endif // INCLUDE_JVMCI 774 775 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread, 776 address pc, 777 SharedRuntime::ImplicitExceptionKind exception_kind) 778 { 779 address target_pc = NULL; 780 781 if (Interpreter::contains(pc)) { 782 #ifdef CC_INTERP 783 // C++ interpreter doesn't throw implicit exceptions 784 ShouldNotReachHere(); 785 #else 786 switch (exception_kind) { 787 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry(); 788 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry(); 789 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry(); 790 default: ShouldNotReachHere(); 791 } 792 #endif // !CC_INTERP 793 } else { 794 switch (exception_kind) { 795 case STACK_OVERFLOW: { 796 // Stack overflow only occurs upon frame setup; the callee is 797 // going to be unwound. Dispatch to a shared runtime stub 798 // which will cause the StackOverflowError to be fabricated 799 // and processed. 800 // Stack overflow should never occur during deoptimization: 801 // the compiled method bangs the stack by as much as the 802 // interpreter would need in case of a deoptimization. The 803 // deoptimization blob and uncommon trap blob bang the stack 804 // in a debug VM to verify the correctness of the compiled 805 // method stack banging. 806 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap"); 807 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc)); 808 return StubRoutines::throw_StackOverflowError_entry(); 809 } 810 811 case IMPLICIT_NULL: { 812 if (VtableStubs::contains(pc)) { 813 // We haven't yet entered the callee frame. Fabricate an 814 // exception and begin dispatching it in the caller. Since 815 // the caller was at a call site, it's safe to destroy all 816 // caller-saved registers, as these entry points do. 817 VtableStub* vt_stub = VtableStubs::stub_containing(pc); 818 819 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error. 820 if (vt_stub == NULL) return NULL; 821 822 if (vt_stub->is_abstract_method_error(pc)) { 823 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs"); 824 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc)); 825 // Instead of throwing the abstract method error here directly, we re-resolve 826 // and will throw the AbstractMethodError during resolve. As a result, we'll 827 // get a more detailed error message. 828 return SharedRuntime::get_handle_wrong_method_stub(); 829 } else { 830 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc)); 831 // Assert that the signal comes from the expected location in stub code. 832 assert(vt_stub->is_null_pointer_exception(pc), 833 "obtained signal from unexpected location in stub code"); 834 return StubRoutines::throw_NullPointerException_at_call_entry(); 835 } 836 } else { 837 CodeBlob* cb = CodeCache::find_blob(pc); 838 839 // If code blob is NULL, then return NULL to signal handler to report the SEGV error. 840 if (cb == NULL) return NULL; 841 842 // Exception happened in CodeCache. Must be either: 843 // 1. Inline-cache check in C2I handler blob, 844 // 2. Inline-cache check in nmethod, or 845 // 3. Implicit null exception in nmethod 846 847 if (!cb->is_compiled()) { 848 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob(); 849 if (!is_in_blob) { 850 // Allow normal crash reporting to handle this 851 return NULL; 852 } 853 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc)); 854 // There is no handler here, so we will simply unwind. 855 return StubRoutines::throw_NullPointerException_at_call_entry(); 856 } 857 858 // Otherwise, it's a compiled method. Consult its exception handlers. 859 CompiledMethod* cm = (CompiledMethod*)cb; 860 if (cm->inlinecache_check_contains(pc)) { 861 // exception happened inside inline-cache check code 862 // => the nmethod is not yet active (i.e., the frame 863 // is not set up yet) => use return address pushed by 864 // caller => don't push another return address 865 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc)); 866 return StubRoutines::throw_NullPointerException_at_call_entry(); 867 } 868 869 if (cm->method()->is_method_handle_intrinsic()) { 870 // exception happened inside MH dispatch code, similar to a vtable stub 871 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc)); 872 return StubRoutines::throw_NullPointerException_at_call_entry(); 873 } 874 875 #ifndef PRODUCT 876 _implicit_null_throws++; 877 #endif 878 #if INCLUDE_JVMCI 879 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) { 880 // If there's no PcDesc then we'll die way down inside of 881 // deopt instead of just getting normal error reporting, 882 // so only go there if it will succeed. 883 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_null_check); 884 } else { 885 #endif // INCLUDE_JVMCI 886 assert (cm->is_nmethod(), "Expect nmethod"); 887 target_pc = ((nmethod*)cm)->continuation_for_implicit_exception(pc); 888 #if INCLUDE_JVMCI 889 } 890 #endif // INCLUDE_JVMCI 891 // If there's an unexpected fault, target_pc might be NULL, 892 // in which case we want to fall through into the normal 893 // error handling code. 894 } 895 896 break; // fall through 897 } 898 899 900 case IMPLICIT_DIVIDE_BY_ZERO: { 901 CompiledMethod* cm = CodeCache::find_compiled(pc); 902 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions"); 903 #ifndef PRODUCT 904 _implicit_div0_throws++; 905 #endif 906 #if INCLUDE_JVMCI 907 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) { 908 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_div0_check); 909 } else { 910 #endif // INCLUDE_JVMCI 911 target_pc = cm->continuation_for_implicit_exception(pc); 912 #if INCLUDE_JVMCI 913 } 914 #endif // INCLUDE_JVMCI 915 // If there's an unexpected fault, target_pc might be NULL, 916 // in which case we want to fall through into the normal 917 // error handling code. 918 break; // fall through 919 } 920 921 default: ShouldNotReachHere(); 922 } 923 924 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind"); 925 926 if (exception_kind == IMPLICIT_NULL) { 927 #ifndef PRODUCT 928 // for AbortVMOnException flag 929 Exceptions::debug_check_abort("java.lang.NullPointerException"); 930 #endif //PRODUCT 931 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc)); 932 } else { 933 #ifndef PRODUCT 934 // for AbortVMOnException flag 935 Exceptions::debug_check_abort("java.lang.ArithmeticException"); 936 #endif //PRODUCT 937 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc)); 938 } 939 return target_pc; 940 } 941 942 ShouldNotReachHere(); 943 return NULL; 944 } 945 946 947 /** 948 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is 949 * installed in the native function entry of all native Java methods before 950 * they get linked to their actual native methods. 951 * 952 * \note 953 * This method actually never gets called! The reason is because 954 * the interpreter's native entries call NativeLookup::lookup() which 955 * throws the exception when the lookup fails. The exception is then 956 * caught and forwarded on the return from NativeLookup::lookup() call 957 * before the call to the native function. This might change in the future. 958 */ 959 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...)) 960 { 961 // We return a bad value here to make sure that the exception is 962 // forwarded before we look at the return value. 963 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress); 964 } 965 JNI_END 966 967 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() { 968 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error); 969 } 970 971 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) 972 #if INCLUDE_JVMCI 973 if (!obj->klass()->has_finalizer()) { 974 return; 975 } 976 #endif // INCLUDE_JVMCI 977 assert(oopDesc::is_oop(obj), "must be a valid oop"); 978 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise"); 979 InstanceKlass::register_finalizer(instanceOop(obj), CHECK); 980 JRT_END 981 982 983 jlong SharedRuntime::get_java_tid(Thread* thread) { 984 if (thread != NULL) { 985 if (thread->is_Java_thread()) { 986 oop obj = ((JavaThread*)thread)->threadObj(); 987 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj); 988 } 989 } 990 return 0; 991 } 992 993 /** 994 * This function ought to be a void function, but cannot be because 995 * it gets turned into a tail-call on sparc, which runs into dtrace bug 996 * 6254741. Once that is fixed we can remove the dummy return value. 997 */ 998 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) { 999 return dtrace_object_alloc_base(Thread::current(), o, size); 1000 } 1001 1002 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) { 1003 assert(DTraceAllocProbes, "wrong call"); 1004 Klass* klass = o->klass(); 1005 Symbol* name = klass->name(); 1006 HOTSPOT_OBJECT_ALLOC( 1007 get_java_tid(thread), 1008 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize); 1009 return 0; 1010 } 1011 1012 JRT_LEAF(int, SharedRuntime::dtrace_method_entry( 1013 JavaThread* thread, Method* method)) 1014 assert(DTraceMethodProbes, "wrong call"); 1015 Symbol* kname = method->klass_name(); 1016 Symbol* name = method->name(); 1017 Symbol* sig = method->signature(); 1018 HOTSPOT_METHOD_ENTRY( 1019 get_java_tid(thread), 1020 (char *) kname->bytes(), kname->utf8_length(), 1021 (char *) name->bytes(), name->utf8_length(), 1022 (char *) sig->bytes(), sig->utf8_length()); 1023 return 0; 1024 JRT_END 1025 1026 JRT_LEAF(int, SharedRuntime::dtrace_method_exit( 1027 JavaThread* thread, Method* method)) 1028 assert(DTraceMethodProbes, "wrong call"); 1029 Symbol* kname = method->klass_name(); 1030 Symbol* name = method->name(); 1031 Symbol* sig = method->signature(); 1032 HOTSPOT_METHOD_RETURN( 1033 get_java_tid(thread), 1034 (char *) kname->bytes(), kname->utf8_length(), 1035 (char *) name->bytes(), name->utf8_length(), 1036 (char *) sig->bytes(), sig->utf8_length()); 1037 return 0; 1038 JRT_END 1039 1040 1041 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode) 1042 // for a call current in progress, i.e., arguments has been pushed on stack 1043 // put callee has not been invoked yet. Used by: resolve virtual/static, 1044 // vtable updates, etc. Caller frame must be compiled. 1045 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) { 1046 ResourceMark rm(THREAD); 1047 1048 // last java frame on stack (which includes native call frames) 1049 vframeStream vfst(thread, true); // Do not skip and javaCalls 1050 1051 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD); 1052 } 1053 1054 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) { 1055 CompiledMethod* caller = vfst.nm(); 1056 1057 nmethodLocker caller_lock(caller); 1058 1059 address pc = vfst.frame_pc(); 1060 { // Get call instruction under lock because another thread may be busy patching it. 1061 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1062 return caller->attached_method_before_pc(pc); 1063 } 1064 return NULL; 1065 } 1066 1067 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode 1068 // for a call current in progress, i.e., arguments has been pushed on stack 1069 // but callee has not been invoked yet. Caller frame must be compiled. 1070 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread, 1071 vframeStream& vfst, 1072 Bytecodes::Code& bc, 1073 CallInfo& callinfo, TRAPS) { 1074 Handle receiver; 1075 Handle nullHandle; //create a handy null handle for exception returns 1076 1077 assert(!vfst.at_end(), "Java frame must exist"); 1078 1079 // Find caller and bci from vframe 1080 methodHandle caller(THREAD, vfst.method()); 1081 int bci = vfst.bci(); 1082 1083 Bytecode_invoke bytecode(caller, bci); 1084 int bytecode_index = bytecode.index(); 1085 1086 methodHandle attached_method = extract_attached_method(vfst); 1087 if (attached_method.not_null()) { 1088 methodHandle callee = bytecode.static_target(CHECK_NH); 1089 vmIntrinsics::ID id = callee->intrinsic_id(); 1090 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call, 1091 // it attaches statically resolved method to the call site. 1092 if (MethodHandles::is_signature_polymorphic(id) && 1093 MethodHandles::is_signature_polymorphic_intrinsic(id)) { 1094 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id); 1095 1096 // Adjust invocation mode according to the attached method. 1097 switch (bc) { 1098 case Bytecodes::_invokeinterface: 1099 if (!attached_method->method_holder()->is_interface()) { 1100 bc = Bytecodes::_invokevirtual; 1101 } 1102 break; 1103 case Bytecodes::_invokehandle: 1104 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) { 1105 bc = attached_method->is_static() ? Bytecodes::_invokestatic 1106 : Bytecodes::_invokevirtual; 1107 } 1108 break; 1109 default: 1110 break; 1111 } 1112 } 1113 } else { 1114 bc = bytecode.invoke_code(); 1115 } 1116 1117 bool has_receiver = bc != Bytecodes::_invokestatic && 1118 bc != Bytecodes::_invokedynamic && 1119 bc != Bytecodes::_invokehandle; 1120 1121 // Find receiver for non-static call 1122 if (has_receiver) { 1123 // This register map must be update since we need to find the receiver for 1124 // compiled frames. The receiver might be in a register. 1125 RegisterMap reg_map2(thread); 1126 frame stubFrame = thread->last_frame(); 1127 // Caller-frame is a compiled frame 1128 frame callerFrame = stubFrame.sender(®_map2); 1129 1130 if (attached_method.is_null()) { 1131 methodHandle callee = bytecode.static_target(CHECK_NH); 1132 if (callee.is_null()) { 1133 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle); 1134 } 1135 } 1136 1137 // Retrieve from a compiled argument list 1138 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2)); 1139 1140 if (receiver.is_null()) { 1141 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle); 1142 } 1143 } 1144 1145 // Resolve method 1146 if (attached_method.not_null()) { 1147 // Parameterized by attached method. 1148 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH); 1149 } else { 1150 // Parameterized by bytecode. 1151 constantPoolHandle constants(THREAD, caller->constants()); 1152 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH); 1153 } 1154 1155 #ifdef ASSERT 1156 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls 1157 if (has_receiver) { 1158 assert(receiver.not_null(), "should have thrown exception"); 1159 Klass* receiver_klass = receiver->klass(); 1160 Klass* rk = NULL; 1161 if (attached_method.not_null()) { 1162 // In case there's resolved method attached, use its holder during the check. 1163 rk = attached_method->method_holder(); 1164 } else { 1165 // Klass is already loaded. 1166 constantPoolHandle constants(THREAD, caller->constants()); 1167 rk = constants->klass_ref_at(bytecode_index, CHECK_NH); 1168 } 1169 Klass* static_receiver_klass = rk; 1170 methodHandle callee = callinfo.selected_method(); 1171 assert(receiver_klass->is_subtype_of(static_receiver_klass), 1172 "actual receiver must be subclass of static receiver klass"); 1173 if (receiver_klass->is_instance_klass()) { 1174 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) { 1175 tty->print_cr("ERROR: Klass not yet initialized!!"); 1176 receiver_klass->print(); 1177 } 1178 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized"); 1179 } 1180 } 1181 #endif 1182 1183 return receiver; 1184 } 1185 1186 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) { 1187 ResourceMark rm(THREAD); 1188 // We need first to check if any Java activations (compiled, interpreted) 1189 // exist on the stack since last JavaCall. If not, we need 1190 // to get the target method from the JavaCall wrapper. 1191 vframeStream vfst(thread, true); // Do not skip any javaCalls 1192 methodHandle callee_method; 1193 if (vfst.at_end()) { 1194 // No Java frames were found on stack since we did the JavaCall. 1195 // Hence the stack can only contain an entry_frame. We need to 1196 // find the target method from the stub frame. 1197 RegisterMap reg_map(thread, false); 1198 frame fr = thread->last_frame(); 1199 assert(fr.is_runtime_frame(), "must be a runtimeStub"); 1200 fr = fr.sender(®_map); 1201 assert(fr.is_entry_frame(), "must be"); 1202 // fr is now pointing to the entry frame. 1203 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method()); 1204 } else { 1205 Bytecodes::Code bc; 1206 CallInfo callinfo; 1207 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle())); 1208 callee_method = callinfo.selected_method(); 1209 } 1210 assert(callee_method()->is_method(), "must be"); 1211 return callee_method; 1212 } 1213 1214 // Resolves a call. 1215 methodHandle SharedRuntime::resolve_helper(JavaThread *thread, 1216 bool is_virtual, 1217 bool is_optimized, TRAPS) { 1218 methodHandle callee_method; 1219 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1220 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 1221 int retry_count = 0; 1222 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() && 1223 callee_method->method_holder() != SystemDictionary::Object_klass()) { 1224 // If has a pending exception then there is no need to re-try to 1225 // resolve this method. 1226 // If the method has been redefined, we need to try again. 1227 // Hack: we have no way to update the vtables of arrays, so don't 1228 // require that java.lang.Object has been updated. 1229 1230 // It is very unlikely that method is redefined more than 100 times 1231 // in the middle of resolve. If it is looping here more than 100 times 1232 // means then there could be a bug here. 1233 guarantee((retry_count++ < 100), 1234 "Could not resolve to latest version of redefined method"); 1235 // method is redefined in the middle of resolve so re-try. 1236 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1237 } 1238 } 1239 return callee_method; 1240 } 1241 1242 // Resolves a call. The compilers generate code for calls that go here 1243 // and are patched with the real destination of the call. 1244 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread, 1245 bool is_virtual, 1246 bool is_optimized, TRAPS) { 1247 1248 ResourceMark rm(thread); 1249 RegisterMap cbl_map(thread, false); 1250 frame caller_frame = thread->last_frame().sender(&cbl_map); 1251 1252 CodeBlob* caller_cb = caller_frame.cb(); 1253 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method"); 1254 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null(); 1255 1256 // make sure caller is not getting deoptimized 1257 // and removed before we are done with it. 1258 // CLEANUP - with lazy deopt shouldn't need this lock 1259 nmethodLocker caller_lock(caller_nm); 1260 1261 // determine call info & receiver 1262 // note: a) receiver is NULL for static calls 1263 // b) an exception is thrown if receiver is NULL for non-static calls 1264 CallInfo call_info; 1265 Bytecodes::Code invoke_code = Bytecodes::_illegal; 1266 Handle receiver = find_callee_info(thread, invoke_code, 1267 call_info, CHECK_(methodHandle())); 1268 methodHandle callee_method = call_info.selected_method(); 1269 1270 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) || 1271 (!is_virtual && invoke_code == Bytecodes::_invokespecial) || 1272 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) || 1273 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) || 1274 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode"); 1275 1276 assert(caller_nm->is_alive(), "It should be alive"); 1277 1278 #ifndef PRODUCT 1279 // tracing/debugging/statistics 1280 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) : 1281 (is_virtual) ? (&_resolve_virtual_ctr) : 1282 (&_resolve_static_ctr); 1283 Atomic::inc(addr); 1284 1285 if (TraceCallFixup) { 1286 ResourceMark rm(thread); 1287 tty->print("resolving %s%s (%s) call to", 1288 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static", 1289 Bytecodes::name(invoke_code)); 1290 callee_method->print_short_name(tty); 1291 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, 1292 p2i(caller_frame.pc()), p2i(callee_method->code())); 1293 } 1294 #endif 1295 1296 // JSR 292 key invariant: 1297 // If the resolved method is a MethodHandle invoke target, the call 1298 // site must be a MethodHandle call site, because the lambda form might tail-call 1299 // leaving the stack in a state unknown to either caller or callee 1300 // TODO detune for now but we might need it again 1301 // assert(!callee_method->is_compiled_lambda_form() || 1302 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site"); 1303 1304 // Compute entry points. This might require generation of C2I converter 1305 // frames, so we cannot be holding any locks here. Furthermore, the 1306 // computation of the entry points is independent of patching the call. We 1307 // always return the entry-point, but we only patch the stub if the call has 1308 // not been deoptimized. Return values: For a virtual call this is an 1309 // (cached_oop, destination address) pair. For a static call/optimized 1310 // virtual this is just a destination address. 1311 1312 StaticCallInfo static_call_info; 1313 CompiledICInfo virtual_call_info; 1314 1315 // Make sure the callee nmethod does not get deoptimized and removed before 1316 // we are done patching the code. 1317 CompiledMethod* callee = callee_method->code(); 1318 1319 if (callee != NULL) { 1320 assert(callee->is_compiled(), "must be nmethod for patching"); 1321 } 1322 1323 if (callee != NULL && !callee->is_in_use()) { 1324 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded. 1325 callee = NULL; 1326 } 1327 nmethodLocker nl_callee(callee); 1328 #ifdef ASSERT 1329 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below 1330 #endif 1331 1332 bool is_nmethod = caller_nm->is_nmethod(); 1333 1334 if (is_virtual) { 1335 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check"); 1336 bool static_bound = call_info.resolved_method()->can_be_statically_bound(); 1337 Klass* klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass(); 1338 CompiledIC::compute_monomorphic_entry(callee_method, klass, 1339 is_optimized, static_bound, is_nmethod, virtual_call_info, 1340 CHECK_(methodHandle())); 1341 } else { 1342 // static call 1343 CompiledStaticCall::compute_entry(callee_method, is_nmethod, static_call_info); 1344 } 1345 1346 // grab lock, check for deoptimization and potentially patch caller 1347 { 1348 MutexLocker ml_patch(CompiledIC_lock); 1349 1350 // Lock blocks for safepoint during which both nmethods can change state. 1351 1352 // Now that we are ready to patch if the Method* was redefined then 1353 // don't update call site and let the caller retry. 1354 // Don't update call site if callee nmethod was unloaded or deoptimized. 1355 // Don't update call site if callee nmethod was replaced by an other nmethod 1356 // which may happen when multiply alive nmethod (tiered compilation) 1357 // will be supported. 1358 if (!callee_method->is_old() && 1359 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) { 1360 #ifdef ASSERT 1361 // We must not try to patch to jump to an already unloaded method. 1362 if (dest_entry_point != 0) { 1363 CodeBlob* cb = CodeCache::find_blob(dest_entry_point); 1364 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee), 1365 "should not call unloaded nmethod"); 1366 } 1367 #endif 1368 if (is_virtual) { 1369 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc()); 1370 if (inline_cache->is_clean()) { 1371 inline_cache->set_to_monomorphic(virtual_call_info); 1372 } 1373 } else { 1374 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc()); 1375 if (ssc->is_clean()) ssc->set(static_call_info); 1376 } 1377 } 1378 1379 } // unlock CompiledIC_lock 1380 1381 return callee_method; 1382 } 1383 1384 1385 // Inline caches exist only in compiled code 1386 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread)) 1387 #ifdef ASSERT 1388 RegisterMap reg_map(thread, false); 1389 frame stub_frame = thread->last_frame(); 1390 assert(stub_frame.is_runtime_frame(), "sanity check"); 1391 frame caller_frame = stub_frame.sender(®_map); 1392 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame"); 1393 #endif /* ASSERT */ 1394 1395 methodHandle callee_method; 1396 JRT_BLOCK 1397 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL); 1398 // Return Method* through TLS 1399 thread->set_vm_result_2(callee_method()); 1400 JRT_BLOCK_END 1401 // return compiled code entry point after potential safepoints 1402 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1403 return callee_method->verified_code_entry(); 1404 JRT_END 1405 1406 1407 // Handle call site that has been made non-entrant 1408 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread)) 1409 // 6243940 We might end up in here if the callee is deoptimized 1410 // as we race to call it. We don't want to take a safepoint if 1411 // the caller was interpreted because the caller frame will look 1412 // interpreted to the stack walkers and arguments are now 1413 // "compiled" so it is much better to make this transition 1414 // invisible to the stack walking code. The i2c path will 1415 // place the callee method in the callee_target. It is stashed 1416 // there because if we try and find the callee by normal means a 1417 // safepoint is possible and have trouble gc'ing the compiled args. 1418 RegisterMap reg_map(thread, false); 1419 frame stub_frame = thread->last_frame(); 1420 assert(stub_frame.is_runtime_frame(), "sanity check"); 1421 frame caller_frame = stub_frame.sender(®_map); 1422 1423 if (caller_frame.is_interpreted_frame() || 1424 caller_frame.is_entry_frame()) { 1425 Method* callee = thread->callee_target(); 1426 guarantee(callee != NULL && callee->is_method(), "bad handshake"); 1427 thread->set_vm_result_2(callee); 1428 thread->set_callee_target(NULL); 1429 return callee->get_c2i_entry(); 1430 } 1431 1432 // Must be compiled to compiled path which is safe to stackwalk 1433 methodHandle callee_method; 1434 JRT_BLOCK 1435 // Force resolving of caller (if we called from compiled frame) 1436 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL); 1437 thread->set_vm_result_2(callee_method()); 1438 JRT_BLOCK_END 1439 // return compiled code entry point after potential safepoints 1440 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1441 return callee_method->verified_code_entry(); 1442 JRT_END 1443 1444 // Handle abstract method call 1445 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread)) 1446 // Verbose error message for AbstractMethodError. 1447 // Get the called method from the invoke bytecode. 1448 vframeStream vfst(thread, true); 1449 assert(!vfst.at_end(), "Java frame must exist"); 1450 methodHandle caller(vfst.method()); 1451 Bytecode_invoke invoke(caller, vfst.bci()); 1452 DEBUG_ONLY( invoke.verify(); ) 1453 1454 // Find the compiled caller frame. 1455 RegisterMap reg_map(thread); 1456 frame stubFrame = thread->last_frame(); 1457 assert(stubFrame.is_runtime_frame(), "must be"); 1458 frame callerFrame = stubFrame.sender(®_map); 1459 assert(callerFrame.is_compiled_frame(), "must be"); 1460 1461 // Install exception and return forward entry. 1462 address res = StubRoutines::throw_AbstractMethodError_entry(); 1463 JRT_BLOCK 1464 methodHandle callee = invoke.static_target(thread); 1465 if (!callee.is_null()) { 1466 oop recv = callerFrame.retrieve_receiver(®_map); 1467 Klass *recv_klass = (recv != NULL) ? recv->klass() : NULL; 1468 LinkResolver::throw_abstract_method_error(callee, recv_klass, thread); 1469 res = StubRoutines::forward_exception_entry(); 1470 } 1471 JRT_BLOCK_END 1472 return res; 1473 JRT_END 1474 1475 1476 // resolve a static call and patch code 1477 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread )) 1478 methodHandle callee_method; 1479 JRT_BLOCK 1480 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL); 1481 thread->set_vm_result_2(callee_method()); 1482 JRT_BLOCK_END 1483 // return compiled code entry point after potential safepoints 1484 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1485 return callee_method->verified_code_entry(); 1486 JRT_END 1487 1488 1489 // resolve virtual call and update inline cache to monomorphic 1490 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread )) 1491 methodHandle callee_method; 1492 JRT_BLOCK 1493 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL); 1494 thread->set_vm_result_2(callee_method()); 1495 JRT_BLOCK_END 1496 // return compiled code entry point after potential safepoints 1497 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1498 return callee_method->verified_code_entry(); 1499 JRT_END 1500 1501 1502 // Resolve a virtual call that can be statically bound (e.g., always 1503 // monomorphic, so it has no inline cache). Patch code to resolved target. 1504 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread)) 1505 methodHandle callee_method; 1506 JRT_BLOCK 1507 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL); 1508 thread->set_vm_result_2(callee_method()); 1509 JRT_BLOCK_END 1510 // return compiled code entry point after potential safepoints 1511 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1512 return callee_method->verified_code_entry(); 1513 JRT_END 1514 1515 1516 1517 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) { 1518 ResourceMark rm(thread); 1519 CallInfo call_info; 1520 Bytecodes::Code bc; 1521 1522 // receiver is NULL for static calls. An exception is thrown for NULL 1523 // receivers for non-static calls 1524 Handle receiver = find_callee_info(thread, bc, call_info, 1525 CHECK_(methodHandle())); 1526 // Compiler1 can produce virtual call sites that can actually be statically bound 1527 // If we fell thru to below we would think that the site was going megamorphic 1528 // when in fact the site can never miss. Worse because we'd think it was megamorphic 1529 // we'd try and do a vtable dispatch however methods that can be statically bound 1530 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a 1531 // reresolution of the call site (as if we did a handle_wrong_method and not an 1532 // plain ic_miss) and the site will be converted to an optimized virtual call site 1533 // never to miss again. I don't believe C2 will produce code like this but if it 1534 // did this would still be the correct thing to do for it too, hence no ifdef. 1535 // 1536 if (call_info.resolved_method()->can_be_statically_bound()) { 1537 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle())); 1538 if (TraceCallFixup) { 1539 RegisterMap reg_map(thread, false); 1540 frame caller_frame = thread->last_frame().sender(®_map); 1541 ResourceMark rm(thread); 1542 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc)); 1543 callee_method->print_short_name(tty); 1544 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc())); 1545 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1546 } 1547 return callee_method; 1548 } 1549 1550 methodHandle callee_method = call_info.selected_method(); 1551 1552 bool should_be_mono = false; 1553 1554 #ifndef PRODUCT 1555 Atomic::inc(&_ic_miss_ctr); 1556 1557 // Statistics & Tracing 1558 if (TraceCallFixup) { 1559 ResourceMark rm(thread); 1560 tty->print("IC miss (%s) call to", Bytecodes::name(bc)); 1561 callee_method->print_short_name(tty); 1562 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1563 } 1564 1565 if (ICMissHistogram) { 1566 MutexLocker m(VMStatistic_lock); 1567 RegisterMap reg_map(thread, false); 1568 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub 1569 // produce statistics under the lock 1570 trace_ic_miss(f.pc()); 1571 } 1572 #endif 1573 1574 // install an event collector so that when a vtable stub is created the 1575 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The 1576 // event can't be posted when the stub is created as locks are held 1577 // - instead the event will be deferred until the event collector goes 1578 // out of scope. 1579 JvmtiDynamicCodeEventCollector event_collector; 1580 1581 // Update inline cache to megamorphic. Skip update if we are called from interpreted. 1582 { MutexLocker ml_patch (CompiledIC_lock); 1583 RegisterMap reg_map(thread, false); 1584 frame caller_frame = thread->last_frame().sender(®_map); 1585 CodeBlob* cb = caller_frame.cb(); 1586 CompiledMethod* caller_nm = cb->as_compiled_method_or_null(); 1587 if (cb->is_compiled()) { 1588 CompiledIC* inline_cache = CompiledIC_before(((CompiledMethod*)cb), caller_frame.pc()); 1589 bool should_be_mono = false; 1590 if (inline_cache->is_optimized()) { 1591 if (TraceCallFixup) { 1592 ResourceMark rm(thread); 1593 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc)); 1594 callee_method->print_short_name(tty); 1595 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1596 } 1597 should_be_mono = true; 1598 } else if (inline_cache->is_icholder_call()) { 1599 CompiledICHolder* ic_oop = inline_cache->cached_icholder(); 1600 if (ic_oop != NULL) { 1601 1602 if (receiver()->klass() == ic_oop->holder_klass()) { 1603 // This isn't a real miss. We must have seen that compiled code 1604 // is now available and we want the call site converted to a 1605 // monomorphic compiled call site. 1606 // We can't assert for callee_method->code() != NULL because it 1607 // could have been deoptimized in the meantime 1608 if (TraceCallFixup) { 1609 ResourceMark rm(thread); 1610 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc)); 1611 callee_method->print_short_name(tty); 1612 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1613 } 1614 should_be_mono = true; 1615 } 1616 } 1617 } 1618 1619 if (should_be_mono) { 1620 1621 // We have a path that was monomorphic but was going interpreted 1622 // and now we have (or had) a compiled entry. We correct the IC 1623 // by using a new icBuffer. 1624 CompiledICInfo info; 1625 Klass* receiver_klass = receiver()->klass(); 1626 inline_cache->compute_monomorphic_entry(callee_method, 1627 receiver_klass, 1628 inline_cache->is_optimized(), 1629 false, caller_nm->is_nmethod(), 1630 info, CHECK_(methodHandle())); 1631 inline_cache->set_to_monomorphic(info); 1632 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) { 1633 // Potential change to megamorphic 1634 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle())); 1635 if (!successful) { 1636 inline_cache->set_to_clean(); 1637 } 1638 } else { 1639 // Either clean or megamorphic 1640 } 1641 } else { 1642 fatal("Unimplemented"); 1643 } 1644 } // Release CompiledIC_lock 1645 1646 return callee_method; 1647 } 1648 1649 // 1650 // Resets a call-site in compiled code so it will get resolved again. 1651 // This routines handles both virtual call sites, optimized virtual call 1652 // sites, and static call sites. Typically used to change a call sites 1653 // destination from compiled to interpreted. 1654 // 1655 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) { 1656 ResourceMark rm(thread); 1657 RegisterMap reg_map(thread, false); 1658 frame stub_frame = thread->last_frame(); 1659 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub"); 1660 frame caller = stub_frame.sender(®_map); 1661 1662 // Do nothing if the frame isn't a live compiled frame. 1663 // nmethod could be deoptimized by the time we get here 1664 // so no update to the caller is needed. 1665 1666 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) { 1667 1668 address pc = caller.pc(); 1669 1670 // Check for static or virtual call 1671 bool is_static_call = false; 1672 CompiledMethod* caller_nm = CodeCache::find_compiled(pc); 1673 1674 // Default call_addr is the location of the "basic" call. 1675 // Determine the address of the call we a reresolving. With 1676 // Inline Caches we will always find a recognizable call. 1677 // With Inline Caches disabled we may or may not find a 1678 // recognizable call. We will always find a call for static 1679 // calls and for optimized virtual calls. For vanilla virtual 1680 // calls it depends on the state of the UseInlineCaches switch. 1681 // 1682 // With Inline Caches disabled we can get here for a virtual call 1683 // for two reasons: 1684 // 1 - calling an abstract method. The vtable for abstract methods 1685 // will run us thru handle_wrong_method and we will eventually 1686 // end up in the interpreter to throw the ame. 1687 // 2 - a racing deoptimization. We could be doing a vanilla vtable 1688 // call and between the time we fetch the entry address and 1689 // we jump to it the target gets deoptimized. Similar to 1 1690 // we will wind up in the interprter (thru a c2i with c2). 1691 // 1692 address call_addr = NULL; 1693 { 1694 // Get call instruction under lock because another thread may be 1695 // busy patching it. 1696 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1697 // Location of call instruction 1698 call_addr = caller_nm->call_instruction_address(pc); 1699 } 1700 // Make sure nmethod doesn't get deoptimized and removed until 1701 // this is done with it. 1702 // CLEANUP - with lazy deopt shouldn't need this lock 1703 nmethodLocker nmlock(caller_nm); 1704 1705 if (call_addr != NULL) { 1706 RelocIterator iter(caller_nm, call_addr, call_addr+1); 1707 int ret = iter.next(); // Get item 1708 if (ret) { 1709 assert(iter.addr() == call_addr, "must find call"); 1710 if (iter.type() == relocInfo::static_call_type) { 1711 is_static_call = true; 1712 } else { 1713 assert(iter.type() == relocInfo::virtual_call_type || 1714 iter.type() == relocInfo::opt_virtual_call_type 1715 , "unexpected relocInfo. type"); 1716 } 1717 } else { 1718 assert(!UseInlineCaches, "relocation info. must exist for this address"); 1719 } 1720 1721 // Cleaning the inline cache will force a new resolve. This is more robust 1722 // than directly setting it to the new destination, since resolving of calls 1723 // is always done through the same code path. (experience shows that it 1724 // leads to very hard to track down bugs, if an inline cache gets updated 1725 // to a wrong method). It should not be performance critical, since the 1726 // resolve is only done once. 1727 1728 bool is_nmethod = caller_nm->is_nmethod(); 1729 MutexLocker ml(CompiledIC_lock); 1730 if (is_static_call) { 1731 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr); 1732 ssc->set_to_clean(); 1733 } else { 1734 // compiled, dispatched call (which used to call an interpreted method) 1735 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr); 1736 inline_cache->set_to_clean(); 1737 } 1738 } 1739 } 1740 1741 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle())); 1742 1743 1744 #ifndef PRODUCT 1745 Atomic::inc(&_wrong_method_ctr); 1746 1747 if (TraceCallFixup) { 1748 ResourceMark rm(thread); 1749 tty->print("handle_wrong_method reresolving call to"); 1750 callee_method->print_short_name(tty); 1751 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1752 } 1753 #endif 1754 1755 return callee_method; 1756 } 1757 1758 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) { 1759 // The faulting unsafe accesses should be changed to throw the error 1760 // synchronously instead. Meanwhile the faulting instruction will be 1761 // skipped over (effectively turning it into a no-op) and an 1762 // asynchronous exception will be raised which the thread will 1763 // handle at a later point. If the instruction is a load it will 1764 // return garbage. 1765 1766 // Request an async exception. 1767 thread->set_pending_unsafe_access_error(); 1768 1769 // Return address of next instruction to execute. 1770 return next_pc; 1771 } 1772 1773 #ifdef ASSERT 1774 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method, 1775 const BasicType* sig_bt, 1776 const VMRegPair* regs) { 1777 ResourceMark rm; 1778 const int total_args_passed = method->size_of_parameters(); 1779 const VMRegPair* regs_with_member_name = regs; 1780 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1); 1781 1782 const int member_arg_pos = total_args_passed - 1; 1783 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob"); 1784 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object"); 1785 1786 const bool is_outgoing = method->is_method_handle_intrinsic(); 1787 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing); 1788 1789 for (int i = 0; i < member_arg_pos; i++) { 1790 VMReg a = regs_with_member_name[i].first(); 1791 VMReg b = regs_without_member_name[i].first(); 1792 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value()); 1793 } 1794 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg"); 1795 } 1796 #endif 1797 1798 bool SharedRuntime::should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb) { 1799 if (destination != entry_point) { 1800 CodeBlob* callee = CodeCache::find_blob(destination); 1801 // callee == cb seems weird. It means calling interpreter thru stub. 1802 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) { 1803 // static call or optimized virtual 1804 if (TraceCallFixup) { 1805 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1806 moop->print_short_name(tty); 1807 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1808 } 1809 return true; 1810 } else { 1811 if (TraceCallFixup) { 1812 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1813 moop->print_short_name(tty); 1814 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1815 } 1816 // assert is too strong could also be resolve destinations. 1817 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be"); 1818 } 1819 } else { 1820 if (TraceCallFixup) { 1821 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1822 moop->print_short_name(tty); 1823 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1824 } 1825 } 1826 return false; 1827 } 1828 1829 // --------------------------------------------------------------------------- 1830 // We are calling the interpreter via a c2i. Normally this would mean that 1831 // we were called by a compiled method. However we could have lost a race 1832 // where we went int -> i2c -> c2i and so the caller could in fact be 1833 // interpreted. If the caller is compiled we attempt to patch the caller 1834 // so he no longer calls into the interpreter. 1835 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc)) 1836 Method* moop(method); 1837 1838 address entry_point = moop->from_compiled_entry_no_trampoline(); 1839 1840 // It's possible that deoptimization can occur at a call site which hasn't 1841 // been resolved yet, in which case this function will be called from 1842 // an nmethod that has been patched for deopt and we can ignore the 1843 // request for a fixup. 1844 // Also it is possible that we lost a race in that from_compiled_entry 1845 // is now back to the i2c in that case we don't need to patch and if 1846 // we did we'd leap into space because the callsite needs to use 1847 // "to interpreter" stub in order to load up the Method*. Don't 1848 // ask me how I know this... 1849 1850 CodeBlob* cb = CodeCache::find_blob(caller_pc); 1851 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) { 1852 return; 1853 } 1854 1855 // The check above makes sure this is a nmethod. 1856 CompiledMethod* nm = cb->as_compiled_method_or_null(); 1857 assert(nm, "must be"); 1858 1859 // Get the return PC for the passed caller PC. 1860 address return_pc = caller_pc + frame::pc_return_offset; 1861 1862 // There is a benign race here. We could be attempting to patch to a compiled 1863 // entry point at the same time the callee is being deoptimized. If that is 1864 // the case then entry_point may in fact point to a c2i and we'd patch the 1865 // call site with the same old data. clear_code will set code() to NULL 1866 // at the end of it. If we happen to see that NULL then we can skip trying 1867 // to patch. If we hit the window where the callee has a c2i in the 1868 // from_compiled_entry and the NULL isn't present yet then we lose the race 1869 // and patch the code with the same old data. Asi es la vida. 1870 1871 if (moop->code() == NULL) return; 1872 1873 if (nm->is_in_use()) { 1874 1875 // Expect to find a native call there (unless it was no-inline cache vtable dispatch) 1876 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1877 if (NativeCall::is_call_before(return_pc)) { 1878 ResourceMark mark; 1879 NativeCallWrapper* call = nm->call_wrapper_before(return_pc); 1880 // 1881 // bug 6281185. We might get here after resolving a call site to a vanilla 1882 // virtual call. Because the resolvee uses the verified entry it may then 1883 // see compiled code and attempt to patch the site by calling us. This would 1884 // then incorrectly convert the call site to optimized and its downhill from 1885 // there. If you're lucky you'll get the assert in the bugid, if not you've 1886 // just made a call site that could be megamorphic into a monomorphic site 1887 // for the rest of its life! Just another racing bug in the life of 1888 // fixup_callers_callsite ... 1889 // 1890 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address()); 1891 iter.next(); 1892 assert(iter.has_current(), "must have a reloc at java call site"); 1893 relocInfo::relocType typ = iter.reloc()->type(); 1894 if (typ != relocInfo::static_call_type && 1895 typ != relocInfo::opt_virtual_call_type && 1896 typ != relocInfo::static_stub_type) { 1897 return; 1898 } 1899 address destination = call->destination(); 1900 if (should_fixup_call_destination(destination, entry_point, caller_pc, moop, cb)) { 1901 call->set_destination_mt_safe(entry_point); 1902 } 1903 } 1904 } 1905 IRT_END 1906 1907 1908 // same as JVM_Arraycopy, but called directly from compiled code 1909 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos, 1910 oopDesc* dest, jint dest_pos, 1911 jint length, 1912 JavaThread* thread)) { 1913 #ifndef PRODUCT 1914 _slow_array_copy_ctr++; 1915 #endif 1916 // Check if we have null pointers 1917 if (src == NULL || dest == NULL) { 1918 THROW(vmSymbols::java_lang_NullPointerException()); 1919 } 1920 // Do the copy. The casts to arrayOop are necessary to the copy_array API, 1921 // even though the copy_array API also performs dynamic checks to ensure 1922 // that src and dest are truly arrays (and are conformable). 1923 // The copy_array mechanism is awkward and could be removed, but 1924 // the compilers don't call this function except as a last resort, 1925 // so it probably doesn't matter. 1926 src->klass()->copy_array((arrayOopDesc*)src, src_pos, 1927 (arrayOopDesc*)dest, dest_pos, 1928 length, thread); 1929 } 1930 JRT_END 1931 1932 // The caller of generate_class_cast_message() (or one of its callers) 1933 // must use a ResourceMark in order to correctly free the result. 1934 char* SharedRuntime::generate_class_cast_message( 1935 JavaThread* thread, Klass* caster_klass) { 1936 1937 // Get target class name from the checkcast instruction 1938 vframeStream vfst(thread, true); 1939 assert(!vfst.at_end(), "Java frame must exist"); 1940 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci())); 1941 constantPoolHandle cpool(thread, vfst.method()->constants()); 1942 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index()); 1943 Symbol* target_klass_name = NULL; 1944 if (target_klass == NULL) { 1945 // This klass should be resolved, but just in case, get the name in the klass slot. 1946 target_klass_name = cpool->klass_name_at(cc.index()); 1947 } 1948 return generate_class_cast_message(caster_klass, target_klass, target_klass_name); 1949 } 1950 1951 1952 // The caller of generate_class_cast_message() (or one of its callers) 1953 // must use a ResourceMark in order to correctly free the result. 1954 char* SharedRuntime::generate_class_cast_message( 1955 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) { 1956 1957 const char* caster_name = caster_klass->class_loader_and_module_name(); 1958 1959 assert(target_klass != NULL || target_klass_name != NULL, "one must be provided"); 1960 const char* target_name = target_klass == NULL ? target_klass_name->as_C_string() : 1961 target_klass->class_loader_and_module_name(); 1962 1963 size_t msglen = strlen(caster_name) + strlen(" cannot be cast to ") + strlen(target_name) + 1; 1964 1965 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen); 1966 if (message == NULL) { 1967 // Shouldn't happen, but don't cause even more problems if it does 1968 message = const_cast<char*>(caster_klass->external_name()); 1969 } else { 1970 jio_snprintf(message, 1971 msglen, 1972 "%s cannot be cast to %s", 1973 caster_name, 1974 target_name); 1975 } 1976 return message; 1977 } 1978 1979 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages()) 1980 (void) JavaThread::current()->reguard_stack(); 1981 JRT_END 1982 1983 1984 // Handles the uncommon case in locking, i.e., contention or an inflated lock. 1985 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread)) 1986 // Disable ObjectSynchronizer::quick_enter() in default config 1987 // on AARCH64 and ARM until JDK-8153107 is resolved. 1988 if (ARM_ONLY((SyncFlags & 256) != 0 &&) 1989 AARCH64_ONLY((SyncFlags & 256) != 0 &&) 1990 !SafepointSynchronize::is_synchronizing()) { 1991 // Only try quick_enter() if we're not trying to reach a safepoint 1992 // so that the calling thread reaches the safepoint more quickly. 1993 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return; 1994 } 1995 // NO_ASYNC required because an async exception on the state transition destructor 1996 // would leave you with the lock held and it would never be released. 1997 // The normal monitorenter NullPointerException is thrown without acquiring a lock 1998 // and the model is that an exception implies the method failed. 1999 JRT_BLOCK_NO_ASYNC 2000 oop obj(_obj); 2001 if (PrintBiasedLockingStatistics) { 2002 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 2003 } 2004 Handle h_obj(THREAD, obj); 2005 if (UseBiasedLocking) { 2006 // Retry fast entry if bias is revoked to avoid unnecessary inflation 2007 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK); 2008 } else { 2009 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK); 2010 } 2011 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here"); 2012 JRT_BLOCK_END 2013 JRT_END 2014 2015 // Handles the uncommon cases of monitor unlocking in compiled code 2016 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD)) 2017 oop obj(_obj); 2018 assert(JavaThread::current() == THREAD, "invariant"); 2019 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore 2020 // testing was unable to ever fire the assert that guarded it so I have removed it. 2021 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?"); 2022 #undef MIGHT_HAVE_PENDING 2023 #ifdef MIGHT_HAVE_PENDING 2024 // Save and restore any pending_exception around the exception mark. 2025 // While the slow_exit must not throw an exception, we could come into 2026 // this routine with one set. 2027 oop pending_excep = NULL; 2028 const char* pending_file; 2029 int pending_line; 2030 if (HAS_PENDING_EXCEPTION) { 2031 pending_excep = PENDING_EXCEPTION; 2032 pending_file = THREAD->exception_file(); 2033 pending_line = THREAD->exception_line(); 2034 CLEAR_PENDING_EXCEPTION; 2035 } 2036 #endif /* MIGHT_HAVE_PENDING */ 2037 2038 { 2039 // Exit must be non-blocking, and therefore no exceptions can be thrown. 2040 EXCEPTION_MARK; 2041 ObjectSynchronizer::slow_exit(obj, lock, THREAD); 2042 } 2043 2044 #ifdef MIGHT_HAVE_PENDING 2045 if (pending_excep != NULL) { 2046 THREAD->set_pending_exception(pending_excep, pending_file, pending_line); 2047 } 2048 #endif /* MIGHT_HAVE_PENDING */ 2049 JRT_END 2050 2051 #ifndef PRODUCT 2052 2053 void SharedRuntime::print_statistics() { 2054 ttyLocker ttyl; 2055 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'"); 2056 2057 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr); 2058 2059 SharedRuntime::print_ic_miss_histogram(); 2060 2061 if (CountRemovableExceptions) { 2062 if (_nof_removable_exceptions > 0) { 2063 Unimplemented(); // this counter is not yet incremented 2064 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions); 2065 } 2066 } 2067 2068 // Dump the JRT_ENTRY counters 2069 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr); 2070 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr); 2071 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr); 2072 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr); 2073 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr); 2074 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr); 2075 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr); 2076 2077 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr); 2078 tty->print_cr("%5d wrong method", _wrong_method_ctr); 2079 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr); 2080 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr); 2081 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr); 2082 2083 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr); 2084 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr); 2085 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr); 2086 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr); 2087 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr); 2088 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr); 2089 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr); 2090 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr); 2091 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr); 2092 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr); 2093 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr); 2094 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr); 2095 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr); 2096 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr); 2097 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr); 2098 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr); 2099 2100 AdapterHandlerLibrary::print_statistics(); 2101 2102 if (xtty != NULL) xtty->tail("statistics"); 2103 } 2104 2105 inline double percent(int x, int y) { 2106 return 100.0 * x / MAX2(y, 1); 2107 } 2108 2109 class MethodArityHistogram { 2110 public: 2111 enum { MAX_ARITY = 256 }; 2112 private: 2113 static int _arity_histogram[MAX_ARITY]; // histogram of #args 2114 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words 2115 static int _max_arity; // max. arity seen 2116 static int _max_size; // max. arg size seen 2117 2118 static void add_method_to_histogram(nmethod* nm) { 2119 Method* m = nm->method(); 2120 ArgumentCount args(m->signature()); 2121 int arity = args.size() + (m->is_static() ? 0 : 1); 2122 int argsize = m->size_of_parameters(); 2123 arity = MIN2(arity, MAX_ARITY-1); 2124 argsize = MIN2(argsize, MAX_ARITY-1); 2125 int count = nm->method()->compiled_invocation_count(); 2126 _arity_histogram[arity] += count; 2127 _size_histogram[argsize] += count; 2128 _max_arity = MAX2(_max_arity, arity); 2129 _max_size = MAX2(_max_size, argsize); 2130 } 2131 2132 void print_histogram_helper(int n, int* histo, const char* name) { 2133 const int N = MIN2(5, n); 2134 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 2135 double sum = 0; 2136 double weighted_sum = 0; 2137 int i; 2138 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; } 2139 double rest = sum; 2140 double percent = sum / 100; 2141 for (i = 0; i <= N; i++) { 2142 rest -= histo[i]; 2143 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent); 2144 } 2145 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent); 2146 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n); 2147 } 2148 2149 void print_histogram() { 2150 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 2151 print_histogram_helper(_max_arity, _arity_histogram, "arity"); 2152 tty->print_cr("\nSame for parameter size (in words):"); 2153 print_histogram_helper(_max_size, _size_histogram, "size"); 2154 tty->cr(); 2155 } 2156 2157 public: 2158 MethodArityHistogram() { 2159 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2160 _max_arity = _max_size = 0; 2161 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0; 2162 CodeCache::nmethods_do(add_method_to_histogram); 2163 print_histogram(); 2164 } 2165 }; 2166 2167 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY]; 2168 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY]; 2169 int MethodArityHistogram::_max_arity; 2170 int MethodArityHistogram::_max_size; 2171 2172 void SharedRuntime::print_call_statistics(int comp_total) { 2173 tty->print_cr("Calls from compiled code:"); 2174 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls; 2175 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls; 2176 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls; 2177 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total)); 2178 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total)); 2179 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls)); 2180 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls)); 2181 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls)); 2182 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls)); 2183 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total)); 2184 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls)); 2185 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls)); 2186 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls)); 2187 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls)); 2188 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total)); 2189 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls)); 2190 tty->cr(); 2191 tty->print_cr("Note 1: counter updates are not MT-safe."); 2192 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;"); 2193 tty->print_cr(" %% in nested categories are relative to their category"); 2194 tty->print_cr(" (and thus add up to more than 100%% with inlining)"); 2195 tty->cr(); 2196 2197 MethodArityHistogram h; 2198 } 2199 #endif 2200 2201 2202 // A simple wrapper class around the calling convention information 2203 // that allows sharing of adapters for the same calling convention. 2204 class AdapterFingerPrint : public CHeapObj<mtCode> { 2205 private: 2206 enum { 2207 _basic_type_bits = 4, 2208 _basic_type_mask = right_n_bits(_basic_type_bits), 2209 _basic_types_per_int = BitsPerInt / _basic_type_bits, 2210 _compact_int_count = 3 2211 }; 2212 // TO DO: Consider integrating this with a more global scheme for compressing signatures. 2213 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive. 2214 2215 union { 2216 int _compact[_compact_int_count]; 2217 int* _fingerprint; 2218 } _value; 2219 int _length; // A negative length indicates the fingerprint is in the compact form, 2220 // Otherwise _value._fingerprint is the array. 2221 2222 // Remap BasicTypes that are handled equivalently by the adapters. 2223 // These are correct for the current system but someday it might be 2224 // necessary to make this mapping platform dependent. 2225 static int adapter_encoding(BasicType in) { 2226 switch (in) { 2227 case T_BOOLEAN: 2228 case T_BYTE: 2229 case T_SHORT: 2230 case T_CHAR: 2231 // There are all promoted to T_INT in the calling convention 2232 return T_INT; 2233 2234 case T_OBJECT: 2235 case T_ARRAY: 2236 // In other words, we assume that any register good enough for 2237 // an int or long is good enough for a managed pointer. 2238 #ifdef _LP64 2239 return T_LONG; 2240 #else 2241 return T_INT; 2242 #endif 2243 2244 case T_INT: 2245 case T_LONG: 2246 case T_FLOAT: 2247 case T_DOUBLE: 2248 case T_VOID: 2249 return in; 2250 2251 default: 2252 ShouldNotReachHere(); 2253 return T_CONFLICT; 2254 } 2255 } 2256 2257 public: 2258 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) { 2259 // The fingerprint is based on the BasicType signature encoded 2260 // into an array of ints with eight entries per int. 2261 int* ptr; 2262 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int; 2263 if (len <= _compact_int_count) { 2264 assert(_compact_int_count == 3, "else change next line"); 2265 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0; 2266 // Storing the signature encoded as signed chars hits about 98% 2267 // of the time. 2268 _length = -len; 2269 ptr = _value._compact; 2270 } else { 2271 _length = len; 2272 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode); 2273 ptr = _value._fingerprint; 2274 } 2275 2276 // Now pack the BasicTypes with 8 per int 2277 int sig_index = 0; 2278 for (int index = 0; index < len; index++) { 2279 int value = 0; 2280 for (int byte = 0; byte < _basic_types_per_int; byte++) { 2281 int bt = ((sig_index < total_args_passed) 2282 ? adapter_encoding(sig_bt[sig_index++]) 2283 : 0); 2284 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits"); 2285 value = (value << _basic_type_bits) | bt; 2286 } 2287 ptr[index] = value; 2288 } 2289 } 2290 2291 ~AdapterFingerPrint() { 2292 if (_length > 0) { 2293 FREE_C_HEAP_ARRAY(int, _value._fingerprint); 2294 } 2295 } 2296 2297 int value(int index) { 2298 if (_length < 0) { 2299 return _value._compact[index]; 2300 } 2301 return _value._fingerprint[index]; 2302 } 2303 int length() { 2304 if (_length < 0) return -_length; 2305 return _length; 2306 } 2307 2308 bool is_compact() { 2309 return _length <= 0; 2310 } 2311 2312 unsigned int compute_hash() { 2313 int hash = 0; 2314 for (int i = 0; i < length(); i++) { 2315 int v = value(i); 2316 hash = (hash << 8) ^ v ^ (hash >> 5); 2317 } 2318 return (unsigned int)hash; 2319 } 2320 2321 const char* as_string() { 2322 stringStream st; 2323 st.print("0x"); 2324 for (int i = 0; i < length(); i++) { 2325 st.print("%08x", value(i)); 2326 } 2327 return st.as_string(); 2328 } 2329 2330 bool equals(AdapterFingerPrint* other) { 2331 if (other->_length != _length) { 2332 return false; 2333 } 2334 if (_length < 0) { 2335 assert(_compact_int_count == 3, "else change next line"); 2336 return _value._compact[0] == other->_value._compact[0] && 2337 _value._compact[1] == other->_value._compact[1] && 2338 _value._compact[2] == other->_value._compact[2]; 2339 } else { 2340 for (int i = 0; i < _length; i++) { 2341 if (_value._fingerprint[i] != other->_value._fingerprint[i]) { 2342 return false; 2343 } 2344 } 2345 } 2346 return true; 2347 } 2348 }; 2349 2350 2351 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries 2352 class AdapterHandlerTable : public BasicHashtable<mtCode> { 2353 friend class AdapterHandlerTableIterator; 2354 2355 private: 2356 2357 #ifndef PRODUCT 2358 static int _lookups; // number of calls to lookup 2359 static int _buckets; // number of buckets checked 2360 static int _equals; // number of buckets checked with matching hash 2361 static int _hits; // number of successful lookups 2362 static int _compact; // number of equals calls with compact signature 2363 #endif 2364 2365 AdapterHandlerEntry* bucket(int i) { 2366 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i); 2367 } 2368 2369 public: 2370 AdapterHandlerTable() 2371 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { } 2372 2373 // Create a new entry suitable for insertion in the table 2374 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 2375 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash()); 2376 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2377 if (DumpSharedSpaces) { 2378 ((CDSAdapterHandlerEntry*)entry)->init(); 2379 } 2380 return entry; 2381 } 2382 2383 // Insert an entry into the table 2384 void add(AdapterHandlerEntry* entry) { 2385 int index = hash_to_index(entry->hash()); 2386 add_entry(index, entry); 2387 } 2388 2389 void free_entry(AdapterHandlerEntry* entry) { 2390 entry->deallocate(); 2391 BasicHashtable<mtCode>::free_entry(entry); 2392 } 2393 2394 // Find a entry with the same fingerprint if it exists 2395 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) { 2396 NOT_PRODUCT(_lookups++); 2397 AdapterFingerPrint fp(total_args_passed, sig_bt); 2398 unsigned int hash = fp.compute_hash(); 2399 int index = hash_to_index(hash); 2400 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2401 NOT_PRODUCT(_buckets++); 2402 if (e->hash() == hash) { 2403 NOT_PRODUCT(_equals++); 2404 if (fp.equals(e->fingerprint())) { 2405 #ifndef PRODUCT 2406 if (fp.is_compact()) _compact++; 2407 _hits++; 2408 #endif 2409 return e; 2410 } 2411 } 2412 } 2413 return NULL; 2414 } 2415 2416 #ifndef PRODUCT 2417 void print_statistics() { 2418 ResourceMark rm; 2419 int longest = 0; 2420 int empty = 0; 2421 int total = 0; 2422 int nonempty = 0; 2423 for (int index = 0; index < table_size(); index++) { 2424 int count = 0; 2425 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2426 count++; 2427 } 2428 if (count != 0) nonempty++; 2429 if (count == 0) empty++; 2430 if (count > longest) longest = count; 2431 total += count; 2432 } 2433 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f", 2434 empty, longest, total, total / (double)nonempty); 2435 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d", 2436 _lookups, _buckets, _equals, _hits, _compact); 2437 } 2438 #endif 2439 }; 2440 2441 2442 #ifndef PRODUCT 2443 2444 int AdapterHandlerTable::_lookups; 2445 int AdapterHandlerTable::_buckets; 2446 int AdapterHandlerTable::_equals; 2447 int AdapterHandlerTable::_hits; 2448 int AdapterHandlerTable::_compact; 2449 2450 #endif 2451 2452 class AdapterHandlerTableIterator : public StackObj { 2453 private: 2454 AdapterHandlerTable* _table; 2455 int _index; 2456 AdapterHandlerEntry* _current; 2457 2458 void scan() { 2459 while (_index < _table->table_size()) { 2460 AdapterHandlerEntry* a = _table->bucket(_index); 2461 _index++; 2462 if (a != NULL) { 2463 _current = a; 2464 return; 2465 } 2466 } 2467 } 2468 2469 public: 2470 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) { 2471 scan(); 2472 } 2473 bool has_next() { 2474 return _current != NULL; 2475 } 2476 AdapterHandlerEntry* next() { 2477 if (_current != NULL) { 2478 AdapterHandlerEntry* result = _current; 2479 _current = _current->next(); 2480 if (_current == NULL) scan(); 2481 return result; 2482 } else { 2483 return NULL; 2484 } 2485 } 2486 }; 2487 2488 2489 // --------------------------------------------------------------------------- 2490 // Implementation of AdapterHandlerLibrary 2491 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL; 2492 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL; 2493 const int AdapterHandlerLibrary_size = 16*K; 2494 BufferBlob* AdapterHandlerLibrary::_buffer = NULL; 2495 2496 BufferBlob* AdapterHandlerLibrary::buffer_blob() { 2497 // Should be called only when AdapterHandlerLibrary_lock is active. 2498 if (_buffer == NULL) // Initialize lazily 2499 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size); 2500 return _buffer; 2501 } 2502 2503 extern "C" void unexpected_adapter_call() { 2504 ShouldNotCallThis(); 2505 } 2506 2507 void AdapterHandlerLibrary::initialize() { 2508 if (_adapters != NULL) return; 2509 _adapters = new AdapterHandlerTable(); 2510 2511 // Create a special handler for abstract methods. Abstract methods 2512 // are never compiled so an i2c entry is somewhat meaningless, but 2513 // throw AbstractMethodError just in case. 2514 // Pass wrong_method_abstract for the c2i transitions to return 2515 // AbstractMethodError for invalid invocations. 2516 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub(); 2517 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL), 2518 StubRoutines::throw_AbstractMethodError_entry(), 2519 wrong_method_abstract, wrong_method_abstract); 2520 } 2521 2522 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint, 2523 address i2c_entry, 2524 address c2i_entry, 2525 address c2i_unverified_entry) { 2526 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2527 } 2528 2529 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) { 2530 AdapterHandlerEntry* entry = get_adapter0(method); 2531 if (method->is_shared()) { 2532 // See comments around Method::link_method() 2533 MutexLocker mu(AdapterHandlerLibrary_lock); 2534 if (method->adapter() == NULL) { 2535 method->update_adapter_trampoline(entry); 2536 } 2537 address trampoline = method->from_compiled_entry(); 2538 if (*(int*)trampoline == 0) { 2539 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size()); 2540 MacroAssembler _masm(&buffer); 2541 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry()); 2542 assert(*(int*)trampoline != 0, "Instruction(s) for trampoline must not be encoded as zeros."); 2543 2544 if (PrintInterpreter) { 2545 Disassembler::decode(buffer.insts_begin(), buffer.insts_end()); 2546 } 2547 } 2548 } 2549 2550 return entry; 2551 } 2552 2553 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) { 2554 // Use customized signature handler. Need to lock around updates to 2555 // the AdapterHandlerTable (it is not safe for concurrent readers 2556 // and a single writer: this could be fixed if it becomes a 2557 // problem). 2558 2559 ResourceMark rm; 2560 2561 NOT_PRODUCT(int insts_size); 2562 AdapterBlob* new_adapter = NULL; 2563 AdapterHandlerEntry* entry = NULL; 2564 AdapterFingerPrint* fingerprint = NULL; 2565 { 2566 MutexLocker mu(AdapterHandlerLibrary_lock); 2567 // make sure data structure is initialized 2568 initialize(); 2569 2570 if (method->is_abstract()) { 2571 return _abstract_method_handler; 2572 } 2573 2574 // Fill in the signature array, for the calling-convention call. 2575 int total_args_passed = method->size_of_parameters(); // All args on stack 2576 2577 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2578 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2579 int i = 0; 2580 if (!method->is_static()) // Pass in receiver first 2581 sig_bt[i++] = T_OBJECT; 2582 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) { 2583 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2584 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2585 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2586 } 2587 assert(i == total_args_passed, ""); 2588 2589 // Lookup method signature's fingerprint 2590 entry = _adapters->lookup(total_args_passed, sig_bt); 2591 2592 #ifdef ASSERT 2593 AdapterHandlerEntry* shared_entry = NULL; 2594 // Start adapter sharing verification only after the VM is booted. 2595 if (VerifyAdapterSharing && (entry != NULL)) { 2596 shared_entry = entry; 2597 entry = NULL; 2598 } 2599 #endif 2600 2601 if (entry != NULL) { 2602 return entry; 2603 } 2604 2605 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage 2606 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); 2607 2608 // Make a C heap allocated version of the fingerprint to store in the adapter 2609 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt); 2610 2611 // StubRoutines::code2() is initialized after this function can be called. As a result, 2612 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated 2613 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C 2614 // stub that ensure that an I2C stub is called from an interpreter frame. 2615 bool contains_all_checks = StubRoutines::code2() != NULL; 2616 2617 // Create I2C & C2I handlers 2618 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2619 if (buf != NULL) { 2620 CodeBuffer buffer(buf); 2621 short buffer_locs[20]; 2622 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs, 2623 sizeof(buffer_locs)/sizeof(relocInfo)); 2624 2625 MacroAssembler _masm(&buffer); 2626 entry = SharedRuntime::generate_i2c2i_adapters(&_masm, 2627 total_args_passed, 2628 comp_args_on_stack, 2629 sig_bt, 2630 regs, 2631 fingerprint); 2632 #ifdef ASSERT 2633 if (VerifyAdapterSharing) { 2634 if (shared_entry != NULL) { 2635 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match"); 2636 // Release the one just created and return the original 2637 _adapters->free_entry(entry); 2638 return shared_entry; 2639 } else { 2640 entry->save_code(buf->code_begin(), buffer.insts_size()); 2641 } 2642 } 2643 #endif 2644 2645 new_adapter = AdapterBlob::create(&buffer); 2646 NOT_PRODUCT(insts_size = buffer.insts_size()); 2647 } 2648 if (new_adapter == NULL) { 2649 // CodeCache is full, disable compilation 2650 // Ought to log this but compile log is only per compile thread 2651 // and we're some non descript Java thread. 2652 return NULL; // Out of CodeCache space 2653 } 2654 entry->relocate(new_adapter->content_begin()); 2655 #ifndef PRODUCT 2656 // debugging suppport 2657 if (PrintAdapterHandlers || PrintStubCode) { 2658 ttyLocker ttyl; 2659 entry->print_adapter_on(tty); 2660 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)", 2661 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"), 2662 method->signature()->as_C_string(), fingerprint->as_string(), insts_size); 2663 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry()); 2664 if (Verbose || PrintStubCode) { 2665 address first_pc = entry->base_address(); 2666 if (first_pc != NULL) { 2667 Disassembler::decode(first_pc, first_pc + insts_size); 2668 tty->cr(); 2669 } 2670 } 2671 } 2672 #endif 2673 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp) 2674 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified. 2675 if (contains_all_checks || !VerifyAdapterCalls) { 2676 _adapters->add(entry); 2677 } 2678 } 2679 // Outside of the lock 2680 if (new_adapter != NULL) { 2681 char blob_id[256]; 2682 jio_snprintf(blob_id, 2683 sizeof(blob_id), 2684 "%s(%s)@" PTR_FORMAT, 2685 new_adapter->name(), 2686 fingerprint->as_string(), 2687 new_adapter->content_begin()); 2688 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end()); 2689 2690 if (JvmtiExport::should_post_dynamic_code_generated()) { 2691 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end()); 2692 } 2693 } 2694 return entry; 2695 } 2696 2697 address AdapterHandlerEntry::base_address() { 2698 address base = _i2c_entry; 2699 if (base == NULL) base = _c2i_entry; 2700 assert(base <= _c2i_entry || _c2i_entry == NULL, ""); 2701 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, ""); 2702 return base; 2703 } 2704 2705 void AdapterHandlerEntry::relocate(address new_base) { 2706 address old_base = base_address(); 2707 assert(old_base != NULL, ""); 2708 ptrdiff_t delta = new_base - old_base; 2709 if (_i2c_entry != NULL) 2710 _i2c_entry += delta; 2711 if (_c2i_entry != NULL) 2712 _c2i_entry += delta; 2713 if (_c2i_unverified_entry != NULL) 2714 _c2i_unverified_entry += delta; 2715 assert(base_address() == new_base, ""); 2716 } 2717 2718 2719 void AdapterHandlerEntry::deallocate() { 2720 delete _fingerprint; 2721 #ifdef ASSERT 2722 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code); 2723 #endif 2724 } 2725 2726 2727 #ifdef ASSERT 2728 // Capture the code before relocation so that it can be compared 2729 // against other versions. If the code is captured after relocation 2730 // then relative instructions won't be equivalent. 2731 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) { 2732 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode); 2733 _saved_code_length = length; 2734 memcpy(_saved_code, buffer, length); 2735 } 2736 2737 2738 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) { 2739 if (length != _saved_code_length) { 2740 return false; 2741 } 2742 2743 return (memcmp(buffer, _saved_code, length) == 0) ? true : false; 2744 } 2745 #endif 2746 2747 2748 /** 2749 * Create a native wrapper for this native method. The wrapper converts the 2750 * Java-compiled calling convention to the native convention, handles 2751 * arguments, and transitions to native. On return from the native we transition 2752 * back to java blocking if a safepoint is in progress. 2753 */ 2754 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) { 2755 ResourceMark rm; 2756 nmethod* nm = NULL; 2757 2758 assert(method->is_native(), "must be native"); 2759 assert(method->is_method_handle_intrinsic() || 2760 method->has_native_function(), "must have something valid to call!"); 2761 2762 { 2763 // Perform the work while holding the lock, but perform any printing outside the lock 2764 MutexLocker mu(AdapterHandlerLibrary_lock); 2765 // See if somebody beat us to it 2766 if (method->code() != NULL) { 2767 return; 2768 } 2769 2770 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci); 2771 assert(compile_id > 0, "Must generate native wrapper"); 2772 2773 2774 ResourceMark rm; 2775 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2776 if (buf != NULL) { 2777 CodeBuffer buffer(buf); 2778 double locs_buf[20]; 2779 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); 2780 MacroAssembler _masm(&buffer); 2781 2782 // Fill in the signature array, for the calling-convention call. 2783 const int total_args_passed = method->size_of_parameters(); 2784 2785 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2786 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2787 int i=0; 2788 if (!method->is_static()) // Pass in receiver first 2789 sig_bt[i++] = T_OBJECT; 2790 SignatureStream ss(method->signature()); 2791 for (; !ss.at_return_type(); ss.next()) { 2792 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2793 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2794 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2795 } 2796 assert(i == total_args_passed, ""); 2797 BasicType ret_type = ss.type(); 2798 2799 // Now get the compiled-Java layout as input (or output) arguments. 2800 // NOTE: Stubs for compiled entry points of method handle intrinsics 2801 // are just trampolines so the argument registers must be outgoing ones. 2802 const bool is_outgoing = method->is_method_handle_intrinsic(); 2803 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing); 2804 2805 // Generate the compiled-to-native wrapper code 2806 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type); 2807 2808 if (nm != NULL) { 2809 method->set_code(method, nm); 2810 2811 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple)); 2812 if (directive->PrintAssemblyOption) { 2813 nm->print_code(); 2814 } 2815 DirectivesStack::release(directive); 2816 } 2817 } 2818 } // Unlock AdapterHandlerLibrary_lock 2819 2820 2821 // Install the generated code. 2822 if (nm != NULL) { 2823 const char *msg = method->is_static() ? "(static)" : ""; 2824 CompileTask::print_ul(nm, msg); 2825 if (PrintCompilation) { 2826 ttyLocker ttyl; 2827 CompileTask::print(tty, nm, msg); 2828 } 2829 nm->post_compiled_method_load_event(); 2830 } 2831 } 2832 2833 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread)) 2834 assert(thread == JavaThread::current(), "must be"); 2835 // The code is about to enter a JNI lazy critical native method and 2836 // _needs_gc is true, so if this thread is already in a critical 2837 // section then just return, otherwise this thread should block 2838 // until needs_gc has been cleared. 2839 if (thread->in_critical()) { 2840 return; 2841 } 2842 // Lock and unlock a critical section to give the system a chance to block 2843 GCLocker::lock_critical(thread); 2844 GCLocker::unlock_critical(thread); 2845 JRT_END 2846 2847 // ------------------------------------------------------------------------- 2848 // Java-Java calling convention 2849 // (what you use when Java calls Java) 2850 2851 //------------------------------name_for_receiver---------------------------------- 2852 // For a given signature, return the VMReg for parameter 0. 2853 VMReg SharedRuntime::name_for_receiver() { 2854 VMRegPair regs; 2855 BasicType sig_bt = T_OBJECT; 2856 (void) java_calling_convention(&sig_bt, ®s, 1, true); 2857 // Return argument 0 register. In the LP64 build pointers 2858 // take 2 registers, but the VM wants only the 'main' name. 2859 return regs.first(); 2860 } 2861 2862 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) { 2863 // This method is returning a data structure allocating as a 2864 // ResourceObject, so do not put any ResourceMarks in here. 2865 char *s = sig->as_C_string(); 2866 int len = (int)strlen(s); 2867 s++; len--; // Skip opening paren 2868 2869 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256); 2870 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256); 2871 int cnt = 0; 2872 if (has_receiver) { 2873 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature 2874 } 2875 2876 while (*s != ')') { // Find closing right paren 2877 switch (*s++) { // Switch on signature character 2878 case 'B': sig_bt[cnt++] = T_BYTE; break; 2879 case 'C': sig_bt[cnt++] = T_CHAR; break; 2880 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break; 2881 case 'F': sig_bt[cnt++] = T_FLOAT; break; 2882 case 'I': sig_bt[cnt++] = T_INT; break; 2883 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break; 2884 case 'S': sig_bt[cnt++] = T_SHORT; break; 2885 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break; 2886 case 'V': sig_bt[cnt++] = T_VOID; break; 2887 case 'L': // Oop 2888 while (*s++ != ';'); // Skip signature 2889 sig_bt[cnt++] = T_OBJECT; 2890 break; 2891 case '[': { // Array 2892 do { // Skip optional size 2893 while (*s >= '0' && *s <= '9') s++; 2894 } while (*s++ == '['); // Nested arrays? 2895 // Skip element type 2896 if (s[-1] == 'L') 2897 while (*s++ != ';'); // Skip signature 2898 sig_bt[cnt++] = T_ARRAY; 2899 break; 2900 } 2901 default : ShouldNotReachHere(); 2902 } 2903 } 2904 2905 if (has_appendix) { 2906 sig_bt[cnt++] = T_OBJECT; 2907 } 2908 2909 assert(cnt < 256, "grow table size"); 2910 2911 int comp_args_on_stack; 2912 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true); 2913 2914 // the calling convention doesn't count out_preserve_stack_slots so 2915 // we must add that in to get "true" stack offsets. 2916 2917 if (comp_args_on_stack) { 2918 for (int i = 0; i < cnt; i++) { 2919 VMReg reg1 = regs[i].first(); 2920 if (reg1->is_stack()) { 2921 // Yuck 2922 reg1 = reg1->bias(out_preserve_stack_slots()); 2923 } 2924 VMReg reg2 = regs[i].second(); 2925 if (reg2->is_stack()) { 2926 // Yuck 2927 reg2 = reg2->bias(out_preserve_stack_slots()); 2928 } 2929 regs[i].set_pair(reg2, reg1); 2930 } 2931 } 2932 2933 // results 2934 *arg_size = cnt; 2935 return regs; 2936 } 2937 2938 // OSR Migration Code 2939 // 2940 // This code is used convert interpreter frames into compiled frames. It is 2941 // called from very start of a compiled OSR nmethod. A temp array is 2942 // allocated to hold the interesting bits of the interpreter frame. All 2943 // active locks are inflated to allow them to move. The displaced headers and 2944 // active interpreter locals are copied into the temp buffer. Then we return 2945 // back to the compiled code. The compiled code then pops the current 2946 // interpreter frame off the stack and pushes a new compiled frame. Then it 2947 // copies the interpreter locals and displaced headers where it wants. 2948 // Finally it calls back to free the temp buffer. 2949 // 2950 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed. 2951 2952 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) ) 2953 2954 // 2955 // This code is dependent on the memory layout of the interpreter local 2956 // array and the monitors. On all of our platforms the layout is identical 2957 // so this code is shared. If some platform lays the their arrays out 2958 // differently then this code could move to platform specific code or 2959 // the code here could be modified to copy items one at a time using 2960 // frame accessor methods and be platform independent. 2961 2962 frame fr = thread->last_frame(); 2963 assert(fr.is_interpreted_frame(), ""); 2964 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks"); 2965 2966 // Figure out how many monitors are active. 2967 int active_monitor_count = 0; 2968 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 2969 kptr < fr.interpreter_frame_monitor_begin(); 2970 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 2971 if (kptr->obj() != NULL) active_monitor_count++; 2972 } 2973 2974 // QQQ we could place number of active monitors in the array so that compiled code 2975 // could double check it. 2976 2977 Method* moop = fr.interpreter_frame_method(); 2978 int max_locals = moop->max_locals(); 2979 // Allocate temp buffer, 1 word per local & 2 per active monitor 2980 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size(); 2981 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode); 2982 2983 // Copy the locals. Order is preserved so that loading of longs works. 2984 // Since there's no GC I can copy the oops blindly. 2985 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code"); 2986 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1), 2987 (HeapWord*)&buf[0], 2988 max_locals); 2989 2990 // Inflate locks. Copy the displaced headers. Be careful, there can be holes. 2991 int i = max_locals; 2992 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end(); 2993 kptr2 < fr.interpreter_frame_monitor_begin(); 2994 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) { 2995 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array 2996 BasicLock *lock = kptr2->lock(); 2997 // Inflate so the displaced header becomes position-independent 2998 if (lock->displaced_header()->is_unlocked()) 2999 ObjectSynchronizer::inflate_helper(kptr2->obj()); 3000 // Now the displaced header is free to move 3001 buf[i++] = (intptr_t)lock->displaced_header(); 3002 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj()); 3003 } 3004 } 3005 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors"); 3006 3007 return buf; 3008 JRT_END 3009 3010 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) ) 3011 FREE_C_HEAP_ARRAY(intptr_t, buf); 3012 JRT_END 3013 3014 bool AdapterHandlerLibrary::contains(const CodeBlob* b) { 3015 AdapterHandlerTableIterator iter(_adapters); 3016 while (iter.has_next()) { 3017 AdapterHandlerEntry* a = iter.next(); 3018 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true; 3019 } 3020 return false; 3021 } 3022 3023 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) { 3024 AdapterHandlerTableIterator iter(_adapters); 3025 while (iter.has_next()) { 3026 AdapterHandlerEntry* a = iter.next(); 3027 if (b == CodeCache::find_blob(a->get_i2c_entry())) { 3028 st->print("Adapter for signature: "); 3029 a->print_adapter_on(tty); 3030 return; 3031 } 3032 } 3033 assert(false, "Should have found handler"); 3034 } 3035 3036 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const { 3037 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT, 3038 p2i(this), fingerprint()->as_string(), 3039 p2i(get_i2c_entry()), p2i(get_c2i_entry()), p2i(get_c2i_unverified_entry())); 3040 3041 } 3042 3043 #if INCLUDE_CDS 3044 3045 void CDSAdapterHandlerEntry::init() { 3046 assert(DumpSharedSpaces, "used during dump time only"); 3047 _c2i_entry_trampoline = (address)MetaspaceShared::misc_code_space_alloc(SharedRuntime::trampoline_size()); 3048 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_code_space_alloc(sizeof(AdapterHandlerEntry*)); 3049 }; 3050 3051 #endif // INCLUDE_CDS 3052 3053 3054 #ifndef PRODUCT 3055 3056 void AdapterHandlerLibrary::print_statistics() { 3057 _adapters->print_statistics(); 3058 } 3059 3060 #endif /* PRODUCT */ 3061 3062 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread)) 3063 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone"); 3064 if (thread->stack_reserved_zone_disabled()) { 3065 thread->enable_stack_reserved_zone(); 3066 } 3067 thread->set_reserved_stack_activation(thread->stack_base()); 3068 JRT_END 3069 3070 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) { 3071 ResourceMark rm(thread); 3072 frame activation; 3073 CompiledMethod* nm = NULL; 3074 int count = 1; 3075 3076 assert(fr.is_java_frame(), "Must start on Java frame"); 3077 3078 while (true) { 3079 Method* method = NULL; 3080 bool found = false; 3081 if (fr.is_interpreted_frame()) { 3082 method = fr.interpreter_frame_method(); 3083 if (method != NULL && method->has_reserved_stack_access()) { 3084 found = true; 3085 } 3086 } else { 3087 CodeBlob* cb = fr.cb(); 3088 if (cb != NULL && cb->is_compiled()) { 3089 nm = cb->as_compiled_method(); 3090 method = nm->method(); 3091 // scope_desc_near() must be used, instead of scope_desc_at() because on 3092 // SPARC, the pcDesc can be on the delay slot after the call instruction. 3093 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != NULL; sd = sd->sender()) { 3094 method = sd->method(); 3095 if (method != NULL && method->has_reserved_stack_access()) { 3096 found = true; 3097 } 3098 } 3099 } 3100 } 3101 if (found) { 3102 activation = fr; 3103 warning("Potentially dangerous stack overflow in " 3104 "ReservedStackAccess annotated method %s [%d]", 3105 method->name_and_sig_as_C_string(), count++); 3106 EventReservedStackActivation event; 3107 if (event.should_commit()) { 3108 event.set_method(method); 3109 event.commit(); 3110 } 3111 } 3112 if (fr.is_first_java_frame()) { 3113 break; 3114 } else { 3115 fr = fr.java_sender(); 3116 } 3117 } 3118 return activation; 3119 } 3120 3121 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* thread) { 3122 // After any safepoint, just before going back to compiled code, 3123 // we inform the GC that we will be doing initializing writes to 3124 // this object in the future without emitting card-marks, so 3125 // GC may take any compensating steps. 3126 3127 oop new_obj = thread->vm_result(); 3128 if (new_obj == NULL) return; 3129 3130 BarrierSet *bs = BarrierSet::barrier_set(); 3131 bs->on_slowpath_allocation_exit(thread, new_obj); 3132 }