1 /* 2 * Copyright (c) 1997, 2017, 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 "aot/aotLoader.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/codeCache.hpp" 31 #include "code/compiledIC.hpp" 32 #include "code/scopeDesc.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "compiler/abstractCompiler.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "compiler/disassembler.hpp" 37 #include "gc/shared/gcLocker.inline.hpp" 38 #include "interpreter/interpreter.hpp" 39 #include "interpreter/interpreterRuntime.hpp" 40 #include "logging/log.hpp" 41 #include "memory/metaspaceShared.hpp" 42 #include "memory/resourceArea.hpp" 43 #include "memory/universe.inline.hpp" 44 #include "oops/klass.hpp" 45 #include "oops/objArrayKlass.hpp" 46 #include "oops/oop.inline.hpp" 47 #include "prims/forte.hpp" 48 #include "prims/jvm.h" 49 #include "prims/jvmtiExport.hpp" 50 #include "prims/methodHandles.hpp" 51 #include "prims/nativeLookup.hpp" 52 #include "runtime/arguments.hpp" 53 #include "runtime/atomic.hpp" 54 #include "runtime/biasedLocking.hpp" 55 #include "runtime/compilationPolicy.hpp" 56 #include "runtime/handles.inline.hpp" 57 #include "runtime/init.hpp" 58 #include "runtime/interfaceSupport.hpp" 59 #include "runtime/java.hpp" 60 #include "runtime/javaCalls.hpp" 61 #include "runtime/sharedRuntime.hpp" 62 #include "runtime/stubRoutines.hpp" 63 #include "runtime/vframe.hpp" 64 #include "runtime/vframeArray.hpp" 65 #include "trace/tracing.hpp" 66 #include "utilities/copy.hpp" 67 #include "utilities/dtrace.hpp" 68 #include "utilities/events.hpp" 69 #include "utilities/hashtable.inline.hpp" 70 #include "utilities/macros.hpp" 71 #include "utilities/xmlstream.hpp" 72 #ifdef COMPILER1 73 #include "c1/c1_Runtime1.hpp" 74 #endif 75 76 // Shared stub locations 77 RuntimeStub* SharedRuntime::_wrong_method_blob; 78 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob; 79 RuntimeStub* SharedRuntime::_ic_miss_blob; 80 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob; 81 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob; 82 RuntimeStub* SharedRuntime::_resolve_static_call_blob; 83 address SharedRuntime::_resolve_static_call_entry; 84 85 DeoptimizationBlob* SharedRuntime::_deopt_blob; 86 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob; 87 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob; 88 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob; 89 90 #ifdef COMPILER2 91 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob; 92 #endif // COMPILER2 93 94 95 //----------------------------generate_stubs----------------------------------- 96 void SharedRuntime::generate_stubs() { 97 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub"); 98 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub"); 99 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub"); 100 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call"); 101 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call"); 102 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call"); 103 _resolve_static_call_entry = _resolve_static_call_blob->entry_point(); 104 105 #if defined(COMPILER2) || INCLUDE_JVMCI 106 // Vectors are generated only by C2 and JVMCI. 107 bool support_wide = is_wide_vector(MaxVectorSize); 108 if (support_wide) { 109 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP); 110 } 111 #endif // COMPILER2 || INCLUDE_JVMCI 112 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP); 113 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN); 114 115 generate_deopt_blob(); 116 117 #ifdef COMPILER2 118 generate_uncommon_trap_blob(); 119 #endif // COMPILER2 120 } 121 122 #include <math.h> 123 124 // Implementation of SharedRuntime 125 126 #ifndef PRODUCT 127 // For statistics 128 int SharedRuntime::_ic_miss_ctr = 0; 129 int SharedRuntime::_wrong_method_ctr = 0; 130 int SharedRuntime::_resolve_static_ctr = 0; 131 int SharedRuntime::_resolve_virtual_ctr = 0; 132 int SharedRuntime::_resolve_opt_virtual_ctr = 0; 133 int SharedRuntime::_implicit_null_throws = 0; 134 int SharedRuntime::_implicit_div0_throws = 0; 135 int SharedRuntime::_throw_null_ctr = 0; 136 137 int SharedRuntime::_nof_normal_calls = 0; 138 int SharedRuntime::_nof_optimized_calls = 0; 139 int SharedRuntime::_nof_inlined_calls = 0; 140 int SharedRuntime::_nof_megamorphic_calls = 0; 141 int SharedRuntime::_nof_static_calls = 0; 142 int SharedRuntime::_nof_inlined_static_calls = 0; 143 int SharedRuntime::_nof_interface_calls = 0; 144 int SharedRuntime::_nof_optimized_interface_calls = 0; 145 int SharedRuntime::_nof_inlined_interface_calls = 0; 146 int SharedRuntime::_nof_megamorphic_interface_calls = 0; 147 int SharedRuntime::_nof_removable_exceptions = 0; 148 149 int SharedRuntime::_new_instance_ctr=0; 150 int SharedRuntime::_new_array_ctr=0; 151 int SharedRuntime::_multi1_ctr=0; 152 int SharedRuntime::_multi2_ctr=0; 153 int SharedRuntime::_multi3_ctr=0; 154 int SharedRuntime::_multi4_ctr=0; 155 int SharedRuntime::_multi5_ctr=0; 156 int SharedRuntime::_mon_enter_stub_ctr=0; 157 int SharedRuntime::_mon_exit_stub_ctr=0; 158 int SharedRuntime::_mon_enter_ctr=0; 159 int SharedRuntime::_mon_exit_ctr=0; 160 int SharedRuntime::_partial_subtype_ctr=0; 161 int SharedRuntime::_jbyte_array_copy_ctr=0; 162 int SharedRuntime::_jshort_array_copy_ctr=0; 163 int SharedRuntime::_jint_array_copy_ctr=0; 164 int SharedRuntime::_jlong_array_copy_ctr=0; 165 int SharedRuntime::_oop_array_copy_ctr=0; 166 int SharedRuntime::_checkcast_array_copy_ctr=0; 167 int SharedRuntime::_unsafe_array_copy_ctr=0; 168 int SharedRuntime::_generic_array_copy_ctr=0; 169 int SharedRuntime::_slow_array_copy_ctr=0; 170 int SharedRuntime::_find_handler_ctr=0; 171 int SharedRuntime::_rethrow_ctr=0; 172 173 int SharedRuntime::_ICmiss_index = 0; 174 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count]; 175 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count]; 176 177 178 void SharedRuntime::trace_ic_miss(address at) { 179 for (int i = 0; i < _ICmiss_index; i++) { 180 if (_ICmiss_at[i] == at) { 181 _ICmiss_count[i]++; 182 return; 183 } 184 } 185 int index = _ICmiss_index++; 186 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1; 187 _ICmiss_at[index] = at; 188 _ICmiss_count[index] = 1; 189 } 190 191 void SharedRuntime::print_ic_miss_histogram() { 192 if (ICMissHistogram) { 193 tty->print_cr("IC Miss Histogram:"); 194 int tot_misses = 0; 195 for (int i = 0; i < _ICmiss_index; i++) { 196 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]); 197 tot_misses += _ICmiss_count[i]; 198 } 199 tty->print_cr("Total IC misses: %7d", tot_misses); 200 } 201 } 202 #endif // PRODUCT 203 204 #if INCLUDE_ALL_GCS 205 206 // G1 write-barrier pre: executed before a pointer store. 207 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread)) 208 if (orig == NULL) { 209 assert(false, "should be optimized out"); 210 return; 211 } 212 assert(oopDesc::is_oop(orig, true /* ignore mark word */), "Error"); 213 // store the original value that was in the field reference 214 thread->satb_mark_queue().enqueue(orig); 215 JRT_END 216 217 // G1 write-barrier post: executed after a pointer store. 218 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread)) 219 thread->dirty_card_queue().enqueue(card_addr); 220 JRT_END 221 222 #endif // INCLUDE_ALL_GCS 223 224 225 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x)) 226 return x * y; 227 JRT_END 228 229 230 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x)) 231 if (x == min_jlong && y == CONST64(-1)) { 232 return x; 233 } else { 234 return x / y; 235 } 236 JRT_END 237 238 239 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x)) 240 if (x == min_jlong && y == CONST64(-1)) { 241 return 0; 242 } else { 243 return x % y; 244 } 245 JRT_END 246 247 248 const juint float_sign_mask = 0x7FFFFFFF; 249 const juint float_infinity = 0x7F800000; 250 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF); 251 const julong double_infinity = CONST64(0x7FF0000000000000); 252 253 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y)) 254 #ifdef _WIN64 255 // 64-bit Windows on amd64 returns the wrong values for 256 // infinity operands. 257 union { jfloat f; juint i; } xbits, ybits; 258 xbits.f = x; 259 ybits.f = y; 260 // x Mod Infinity == x unless x is infinity 261 if (((xbits.i & float_sign_mask) != float_infinity) && 262 ((ybits.i & float_sign_mask) == float_infinity) ) { 263 return x; 264 } 265 return ((jfloat)fmod_winx64((double)x, (double)y)); 266 #else 267 return ((jfloat)fmod((double)x,(double)y)); 268 #endif 269 JRT_END 270 271 272 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y)) 273 #ifdef _WIN64 274 union { jdouble d; julong l; } xbits, ybits; 275 xbits.d = x; 276 ybits.d = y; 277 // x Mod Infinity == x unless x is infinity 278 if (((xbits.l & double_sign_mask) != double_infinity) && 279 ((ybits.l & double_sign_mask) == double_infinity) ) { 280 return x; 281 } 282 return ((jdouble)fmod_winx64((double)x, (double)y)); 283 #else 284 return ((jdouble)fmod((double)x,(double)y)); 285 #endif 286 JRT_END 287 288 #ifdef __SOFTFP__ 289 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y)) 290 return x + y; 291 JRT_END 292 293 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y)) 294 return x - y; 295 JRT_END 296 297 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y)) 298 return x * y; 299 JRT_END 300 301 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y)) 302 return x / y; 303 JRT_END 304 305 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y)) 306 return x + y; 307 JRT_END 308 309 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y)) 310 return x - y; 311 JRT_END 312 313 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y)) 314 return x * y; 315 JRT_END 316 317 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y)) 318 return x / y; 319 JRT_END 320 321 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x)) 322 return (jfloat)x; 323 JRT_END 324 325 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x)) 326 return (jdouble)x; 327 JRT_END 328 329 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x)) 330 return (jdouble)x; 331 JRT_END 332 333 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y)) 334 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/ 335 JRT_END 336 337 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y)) 338 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 339 JRT_END 340 341 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y)) 342 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */ 343 JRT_END 344 345 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y)) 346 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 347 JRT_END 348 349 // Functions to return the opposite of the aeabi functions for nan. 350 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(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_dcmplt(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_fcmple(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_dcmple(double x, double y)) 363 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 364 JRT_END 365 366 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y)) 367 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 368 JRT_END 369 370 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y)) 371 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 372 JRT_END 373 374 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y)) 375 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 376 JRT_END 377 378 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y)) 379 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 380 JRT_END 381 382 // Intrinsics make gcc generate code for these. 383 float SharedRuntime::fneg(float f) { 384 return -f; 385 } 386 387 double SharedRuntime::dneg(double f) { 388 return -f; 389 } 390 391 #endif // __SOFTFP__ 392 393 #if defined(__SOFTFP__) || defined(E500V2) 394 // Intrinsics make gcc generate code for these. 395 double SharedRuntime::dabs(double f) { 396 return (f <= (double)0.0) ? (double)0.0 - f : f; 397 } 398 399 #endif 400 401 #if defined(__SOFTFP__) || defined(PPC) 402 double SharedRuntime::dsqrt(double f) { 403 return sqrt(f); 404 } 405 #endif 406 407 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x)) 408 if (g_isnan(x)) 409 return 0; 410 if (x >= (jfloat) max_jint) 411 return max_jint; 412 if (x <= (jfloat) min_jint) 413 return min_jint; 414 return (jint) x; 415 JRT_END 416 417 418 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x)) 419 if (g_isnan(x)) 420 return 0; 421 if (x >= (jfloat) max_jlong) 422 return max_jlong; 423 if (x <= (jfloat) min_jlong) 424 return min_jlong; 425 return (jlong) x; 426 JRT_END 427 428 429 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x)) 430 if (g_isnan(x)) 431 return 0; 432 if (x >= (jdouble) max_jint) 433 return max_jint; 434 if (x <= (jdouble) min_jint) 435 return min_jint; 436 return (jint) x; 437 JRT_END 438 439 440 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x)) 441 if (g_isnan(x)) 442 return 0; 443 if (x >= (jdouble) max_jlong) 444 return max_jlong; 445 if (x <= (jdouble) min_jlong) 446 return min_jlong; 447 return (jlong) x; 448 JRT_END 449 450 451 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x)) 452 return (jfloat)x; 453 JRT_END 454 455 456 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x)) 457 return (jfloat)x; 458 JRT_END 459 460 461 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x)) 462 return (jdouble)x; 463 JRT_END 464 465 // Exception handling across interpreter/compiler boundaries 466 // 467 // exception_handler_for_return_address(...) returns the continuation address. 468 // The continuation address is the entry point of the exception handler of the 469 // previous frame depending on the return address. 470 471 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) { 472 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address)); 473 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?"); 474 475 // Reset method handle flag. 476 thread->set_is_method_handle_return(false); 477 478 #if INCLUDE_JVMCI 479 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear 480 // and other exception handler continuations do not read it 481 thread->set_exception_pc(NULL); 482 #endif // INCLUDE_JVMCI 483 484 // The fastest case first 485 CodeBlob* blob = CodeCache::find_blob(return_address); 486 CompiledMethod* nm = (blob != NULL) ? blob->as_compiled_method_or_null() : NULL; 487 if (nm != NULL) { 488 // Set flag if return address is a method handle call site. 489 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address)); 490 // native nmethods don't have exception handlers 491 assert(!nm->is_native_method(), "no exception handler"); 492 assert(nm->header_begin() != nm->exception_begin(), "no exception handler"); 493 if (nm->is_deopt_pc(return_address)) { 494 // If we come here because of a stack overflow, the stack may be 495 // unguarded. Reguard the stack otherwise if we return to the 496 // deopt blob and the stack bang causes a stack overflow we 497 // crash. 498 bool guard_pages_enabled = thread->stack_guards_enabled(); 499 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); 500 if (thread->reserved_stack_activation() != thread->stack_base()) { 501 thread->set_reserved_stack_activation(thread->stack_base()); 502 } 503 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash"); 504 return SharedRuntime::deopt_blob()->unpack_with_exception(); 505 } else { 506 return nm->exception_begin(); 507 } 508 } 509 510 // Entry code 511 if (StubRoutines::returns_to_call_stub(return_address)) { 512 return StubRoutines::catch_exception_entry(); 513 } 514 // Interpreted code 515 if (Interpreter::contains(return_address)) { 516 return Interpreter::rethrow_exception_entry(); 517 } 518 519 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub"); 520 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!"); 521 522 #ifndef PRODUCT 523 { ResourceMark rm; 524 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address)); 525 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here"); 526 tty->print_cr("b) other problem"); 527 } 528 #endif // PRODUCT 529 530 ShouldNotReachHere(); 531 return NULL; 532 } 533 534 535 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address)) 536 return raw_exception_handler_for_return_address(thread, return_address); 537 JRT_END 538 539 540 address SharedRuntime::get_poll_stub(address pc) { 541 address stub; 542 // Look up the code blob 543 CodeBlob *cb = CodeCache::find_blob(pc); 544 545 // Should be an nmethod 546 guarantee(cb != NULL && cb->is_compiled(), "safepoint polling: pc must refer to an nmethod"); 547 548 // Look up the relocation information 549 assert(((CompiledMethod*)cb)->is_at_poll_or_poll_return(pc), 550 "safepoint polling: type must be poll"); 551 552 #ifdef ASSERT 553 if (!((NativeInstruction*)pc)->is_safepoint_poll()) { 554 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc)); 555 Disassembler::decode(cb); 556 fatal("Only polling locations are used for safepoint"); 557 } 558 #endif 559 560 bool at_poll_return = ((CompiledMethod*)cb)->is_at_poll_return(pc); 561 bool has_wide_vectors = ((CompiledMethod*)cb)->has_wide_vectors(); 562 if (at_poll_return) { 563 assert(SharedRuntime::polling_page_return_handler_blob() != NULL, 564 "polling page return stub not created yet"); 565 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point(); 566 } else if (has_wide_vectors) { 567 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL, 568 "polling page vectors safepoint stub not created yet"); 569 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point(); 570 } else { 571 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL, 572 "polling page safepoint stub not created yet"); 573 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point(); 574 } 575 log_debug(safepoint)("... found polling page %s exception at pc = " 576 INTPTR_FORMAT ", stub =" INTPTR_FORMAT, 577 at_poll_return ? "return" : "loop", 578 (intptr_t)pc, (intptr_t)stub); 579 return stub; 580 } 581 582 583 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) { 584 assert(caller.is_interpreted_frame(), ""); 585 int args_size = ArgumentSizeComputer(sig).size() + 1; 586 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack"); 587 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1)); 588 assert(Universe::heap()->is_in(result) && oopDesc::is_oop(result), "receiver must be an oop"); 589 return result; 590 } 591 592 593 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) { 594 if (JvmtiExport::can_post_on_exceptions()) { 595 vframeStream vfst(thread, true); 596 methodHandle method = methodHandle(thread, vfst.method()); 597 address bcp = method()->bcp_from(vfst.bci()); 598 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception()); 599 } 600 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception); 601 } 602 603 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) { 604 Handle h_exception = Exceptions::new_exception(thread, name, message); 605 throw_and_post_jvmti_exception(thread, h_exception); 606 } 607 608 // The interpreter code to call this tracing function is only 609 // called/generated when UL is on for redefine, class and has the right level 610 // and tags. Since obsolete methods are never compiled, we don't have 611 // to modify the compilers to generate calls to this function. 612 // 613 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry( 614 JavaThread* thread, Method* method)) 615 if (method->is_obsolete()) { 616 // We are calling an obsolete method, but this is not necessarily 617 // an error. Our method could have been redefined just after we 618 // fetched the Method* from the constant pool. 619 ResourceMark rm; 620 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string()); 621 } 622 return 0; 623 JRT_END 624 625 // ret_pc points into caller; we are returning caller's exception handler 626 // for given exception 627 address SharedRuntime::compute_compiled_exc_handler(CompiledMethod* cm, address ret_pc, Handle& exception, 628 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) { 629 assert(cm != NULL, "must exist"); 630 ResourceMark rm; 631 632 #if INCLUDE_JVMCI 633 if (cm->is_compiled_by_jvmci()) { 634 // lookup exception handler for this pc 635 int catch_pco = ret_pc - cm->code_begin(); 636 ExceptionHandlerTable table(cm); 637 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0); 638 if (t != NULL) { 639 return cm->code_begin() + t->pco(); 640 } else { 641 return Deoptimization::deoptimize_for_missing_exception_handler(cm); 642 } 643 } 644 #endif // INCLUDE_JVMCI 645 646 nmethod* nm = cm->as_nmethod(); 647 ScopeDesc* sd = nm->scope_desc_at(ret_pc); 648 // determine handler bci, if any 649 EXCEPTION_MARK; 650 651 int handler_bci = -1; 652 int scope_depth = 0; 653 if (!force_unwind) { 654 int bci = sd->bci(); 655 bool recursive_exception = false; 656 do { 657 bool skip_scope_increment = false; 658 // exception handler lookup 659 Klass* ek = exception->klass(); 660 methodHandle mh(THREAD, sd->method()); 661 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD); 662 if (HAS_PENDING_EXCEPTION) { 663 recursive_exception = true; 664 // We threw an exception while trying to find the exception handler. 665 // Transfer the new exception to the exception handle which will 666 // be set into thread local storage, and do another lookup for an 667 // exception handler for this exception, this time starting at the 668 // BCI of the exception handler which caused the exception to be 669 // thrown (bugs 4307310 and 4546590). Set "exception" reference 670 // argument to ensure that the correct exception is thrown (4870175). 671 recursive_exception_occurred = true; 672 exception = Handle(THREAD, PENDING_EXCEPTION); 673 CLEAR_PENDING_EXCEPTION; 674 if (handler_bci >= 0) { 675 bci = handler_bci; 676 handler_bci = -1; 677 skip_scope_increment = true; 678 } 679 } 680 else { 681 recursive_exception = false; 682 } 683 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) { 684 sd = sd->sender(); 685 if (sd != NULL) { 686 bci = sd->bci(); 687 } 688 ++scope_depth; 689 } 690 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL)); 691 } 692 693 // found handling method => lookup exception handler 694 int catch_pco = ret_pc - nm->code_begin(); 695 696 ExceptionHandlerTable table(nm); 697 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth); 698 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) { 699 // Allow abbreviated catch tables. The idea is to allow a method 700 // to materialize its exceptions without committing to the exact 701 // routing of exceptions. In particular this is needed for adding 702 // a synthetic handler to unlock monitors when inlining 703 // synchronized methods since the unlock path isn't represented in 704 // the bytecodes. 705 t = table.entry_for(catch_pco, -1, 0); 706 } 707 708 #ifdef COMPILER1 709 if (t == NULL && nm->is_compiled_by_c1()) { 710 assert(nm->unwind_handler_begin() != NULL, ""); 711 return nm->unwind_handler_begin(); 712 } 713 #endif 714 715 if (t == NULL) { 716 ttyLocker ttyl; 717 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci); 718 tty->print_cr(" Exception:"); 719 exception->print(); 720 tty->cr(); 721 tty->print_cr(" Compiled exception table :"); 722 table.print(); 723 nm->print_code(); 724 guarantee(false, "missing exception handler"); 725 return NULL; 726 } 727 728 return nm->code_begin() + t->pco(); 729 } 730 731 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread)) 732 // These errors occur only at call sites 733 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError()); 734 JRT_END 735 736 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 737 // These errors occur only at call sites 738 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub"); 739 JRT_END 740 741 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread)) 742 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 743 JRT_END 744 745 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread)) 746 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 747 JRT_END 748 749 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread)) 750 // This entry point is effectively only used for NullPointerExceptions which occur at inline 751 // cache sites (when the callee activation is not yet set up) so we are at a call site 752 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 753 JRT_END 754 755 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread)) 756 throw_StackOverflowError_common(thread, false); 757 JRT_END 758 759 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread)) 760 throw_StackOverflowError_common(thread, true); 761 JRT_END 762 763 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) { 764 // We avoid using the normal exception construction in this case because 765 // it performs an upcall to Java, and we're already out of stack space. 766 Thread* THREAD = thread; 767 Klass* k = SystemDictionary::StackOverflowError_klass(); 768 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK); 769 if (delayed) { 770 java_lang_Throwable::set_message(exception_oop, 771 Universe::delayed_stack_overflow_error_message()); 772 } 773 Handle exception (thread, exception_oop); 774 if (StackTraceInThrowable) { 775 java_lang_Throwable::fill_in_stack_trace(exception); 776 } 777 // Increment counter for hs_err file reporting 778 Atomic::inc(&Exceptions::_stack_overflow_errors); 779 throw_and_post_jvmti_exception(thread, exception); 780 } 781 782 #if INCLUDE_JVMCI 783 address SharedRuntime::deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason) { 784 assert(deopt_reason > Deoptimization::Reason_none && deopt_reason < Deoptimization::Reason_LIMIT, "invalid deopt reason"); 785 thread->set_jvmci_implicit_exception_pc(pc); 786 thread->set_pending_deoptimization(Deoptimization::make_trap_request((Deoptimization::DeoptReason)deopt_reason, Deoptimization::Action_reinterpret)); 787 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap()); 788 } 789 #endif // INCLUDE_JVMCI 790 791 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread, 792 address pc, 793 SharedRuntime::ImplicitExceptionKind exception_kind) 794 { 795 address target_pc = NULL; 796 797 if (Interpreter::contains(pc)) { 798 #ifdef CC_INTERP 799 // C++ interpreter doesn't throw implicit exceptions 800 ShouldNotReachHere(); 801 #else 802 switch (exception_kind) { 803 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry(); 804 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry(); 805 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry(); 806 default: ShouldNotReachHere(); 807 } 808 #endif // !CC_INTERP 809 } else { 810 switch (exception_kind) { 811 case STACK_OVERFLOW: { 812 // Stack overflow only occurs upon frame setup; the callee is 813 // going to be unwound. Dispatch to a shared runtime stub 814 // which will cause the StackOverflowError to be fabricated 815 // and processed. 816 // Stack overflow should never occur during deoptimization: 817 // the compiled method bangs the stack by as much as the 818 // interpreter would need in case of a deoptimization. The 819 // deoptimization blob and uncommon trap blob bang the stack 820 // in a debug VM to verify the correctness of the compiled 821 // method stack banging. 822 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap"); 823 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc)); 824 return StubRoutines::throw_StackOverflowError_entry(); 825 } 826 827 case IMPLICIT_NULL: { 828 if (VtableStubs::contains(pc)) { 829 // We haven't yet entered the callee frame. Fabricate an 830 // exception and begin dispatching it in the caller. Since 831 // the caller was at a call site, it's safe to destroy all 832 // caller-saved registers, as these entry points do. 833 VtableStub* vt_stub = VtableStubs::stub_containing(pc); 834 835 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error. 836 if (vt_stub == NULL) return NULL; 837 838 if (vt_stub->is_abstract_method_error(pc)) { 839 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs"); 840 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc)); 841 return StubRoutines::throw_AbstractMethodError_entry(); 842 } else { 843 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc)); 844 return StubRoutines::throw_NullPointerException_at_call_entry(); 845 } 846 } else { 847 CodeBlob* cb = CodeCache::find_blob(pc); 848 849 // If code blob is NULL, then return NULL to signal handler to report the SEGV error. 850 if (cb == NULL) return NULL; 851 852 // Exception happened in CodeCache. Must be either: 853 // 1. Inline-cache check in C2I handler blob, 854 // 2. Inline-cache check in nmethod, or 855 // 3. Implicit null exception in nmethod 856 857 if (!cb->is_compiled()) { 858 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob(); 859 if (!is_in_blob) { 860 // Allow normal crash reporting to handle this 861 return NULL; 862 } 863 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc)); 864 // There is no handler here, so we will simply unwind. 865 return StubRoutines::throw_NullPointerException_at_call_entry(); 866 } 867 868 // Otherwise, it's a compiled method. Consult its exception handlers. 869 CompiledMethod* cm = (CompiledMethod*)cb; 870 if (cm->inlinecache_check_contains(pc)) { 871 // exception happened inside inline-cache check code 872 // => the nmethod is not yet active (i.e., the frame 873 // is not set up yet) => use return address pushed by 874 // caller => don't push another return address 875 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc)); 876 return StubRoutines::throw_NullPointerException_at_call_entry(); 877 } 878 879 if (cm->method()->is_method_handle_intrinsic()) { 880 // exception happened inside MH dispatch code, similar to a vtable stub 881 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc)); 882 return StubRoutines::throw_NullPointerException_at_call_entry(); 883 } 884 885 #ifndef PRODUCT 886 _implicit_null_throws++; 887 #endif 888 #if INCLUDE_JVMCI 889 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) { 890 // If there's no PcDesc then we'll die way down inside of 891 // deopt instead of just getting normal error reporting, 892 // so only go there if it will succeed. 893 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_null_check); 894 } else { 895 #endif // INCLUDE_JVMCI 896 assert (cm->is_nmethod(), "Expect nmethod"); 897 target_pc = ((nmethod*)cm)->continuation_for_implicit_exception(pc); 898 #if INCLUDE_JVMCI 899 } 900 #endif // INCLUDE_JVMCI 901 // If there's an unexpected fault, target_pc might be NULL, 902 // in which case we want to fall through into the normal 903 // error handling code. 904 } 905 906 break; // fall through 907 } 908 909 910 case IMPLICIT_DIVIDE_BY_ZERO: { 911 CompiledMethod* cm = CodeCache::find_compiled(pc); 912 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions"); 913 #ifndef PRODUCT 914 _implicit_div0_throws++; 915 #endif 916 #if INCLUDE_JVMCI 917 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) { 918 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_div0_check); 919 } else { 920 #endif // INCLUDE_JVMCI 921 target_pc = cm->continuation_for_implicit_exception(pc); 922 #if INCLUDE_JVMCI 923 } 924 #endif // INCLUDE_JVMCI 925 // If there's an unexpected fault, target_pc might be NULL, 926 // in which case we want to fall through into the normal 927 // error handling code. 928 break; // fall through 929 } 930 931 default: ShouldNotReachHere(); 932 } 933 934 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind"); 935 936 if (exception_kind == IMPLICIT_NULL) { 937 #ifndef PRODUCT 938 // for AbortVMOnException flag 939 Exceptions::debug_check_abort("java.lang.NullPointerException"); 940 #endif //PRODUCT 941 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc)); 942 } else { 943 #ifndef PRODUCT 944 // for AbortVMOnException flag 945 Exceptions::debug_check_abort("java.lang.ArithmeticException"); 946 #endif //PRODUCT 947 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc)); 948 } 949 return target_pc; 950 } 951 952 ShouldNotReachHere(); 953 return NULL; 954 } 955 956 957 /** 958 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is 959 * installed in the native function entry of all native Java methods before 960 * they get linked to their actual native methods. 961 * 962 * \note 963 * This method actually never gets called! The reason is because 964 * the interpreter's native entries call NativeLookup::lookup() which 965 * throws the exception when the lookup fails. The exception is then 966 * caught and forwarded on the return from NativeLookup::lookup() call 967 * before the call to the native function. This might change in the future. 968 */ 969 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...)) 970 { 971 // We return a bad value here to make sure that the exception is 972 // forwarded before we look at the return value. 973 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle); 974 } 975 JNI_END 976 977 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() { 978 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error); 979 } 980 981 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) 982 #if INCLUDE_JVMCI 983 if (!obj->klass()->has_finalizer()) { 984 return; 985 } 986 #endif // INCLUDE_JVMCI 987 assert(oopDesc::is_oop(obj), "must be a valid oop"); 988 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise"); 989 InstanceKlass::register_finalizer(instanceOop(obj), CHECK); 990 JRT_END 991 992 993 jlong SharedRuntime::get_java_tid(Thread* thread) { 994 if (thread != NULL) { 995 if (thread->is_Java_thread()) { 996 oop obj = ((JavaThread*)thread)->threadObj(); 997 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj); 998 } 999 } 1000 return 0; 1001 } 1002 1003 /** 1004 * This function ought to be a void function, but cannot be because 1005 * it gets turned into a tail-call on sparc, which runs into dtrace bug 1006 * 6254741. Once that is fixed we can remove the dummy return value. 1007 */ 1008 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) { 1009 return dtrace_object_alloc_base(Thread::current(), o, size); 1010 } 1011 1012 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) { 1013 assert(DTraceAllocProbes, "wrong call"); 1014 Klass* klass = o->klass(); 1015 Symbol* name = klass->name(); 1016 HOTSPOT_OBJECT_ALLOC( 1017 get_java_tid(thread), 1018 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize); 1019 return 0; 1020 } 1021 1022 JRT_LEAF(int, SharedRuntime::dtrace_method_entry( 1023 JavaThread* thread, Method* method)) 1024 assert(DTraceMethodProbes, "wrong call"); 1025 Symbol* kname = method->klass_name(); 1026 Symbol* name = method->name(); 1027 Symbol* sig = method->signature(); 1028 HOTSPOT_METHOD_ENTRY( 1029 get_java_tid(thread), 1030 (char *) kname->bytes(), kname->utf8_length(), 1031 (char *) name->bytes(), name->utf8_length(), 1032 (char *) sig->bytes(), sig->utf8_length()); 1033 return 0; 1034 JRT_END 1035 1036 JRT_LEAF(int, SharedRuntime::dtrace_method_exit( 1037 JavaThread* thread, Method* method)) 1038 assert(DTraceMethodProbes, "wrong call"); 1039 Symbol* kname = method->klass_name(); 1040 Symbol* name = method->name(); 1041 Symbol* sig = method->signature(); 1042 HOTSPOT_METHOD_RETURN( 1043 get_java_tid(thread), 1044 (char *) kname->bytes(), kname->utf8_length(), 1045 (char *) name->bytes(), name->utf8_length(), 1046 (char *) sig->bytes(), sig->utf8_length()); 1047 return 0; 1048 JRT_END 1049 1050 1051 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode) 1052 // for a call current in progress, i.e., arguments has been pushed on stack 1053 // put callee has not been invoked yet. Used by: resolve virtual/static, 1054 // vtable updates, etc. Caller frame must be compiled. 1055 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) { 1056 ResourceMark rm(THREAD); 1057 1058 // last java frame on stack (which includes native call frames) 1059 vframeStream vfst(thread, true); // Do not skip and javaCalls 1060 1061 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD); 1062 } 1063 1064 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) { 1065 CompiledMethod* caller = vfst.nm(); 1066 1067 nmethodLocker caller_lock(caller); 1068 1069 address pc = vfst.frame_pc(); 1070 { // Get call instruction under lock because another thread may be busy patching it. 1071 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1072 return caller->attached_method_before_pc(pc); 1073 } 1074 return NULL; 1075 } 1076 1077 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode 1078 // for a call current in progress, i.e., arguments has been pushed on stack 1079 // but callee has not been invoked yet. Caller frame must be compiled. 1080 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread, 1081 vframeStream& vfst, 1082 Bytecodes::Code& bc, 1083 CallInfo& callinfo, TRAPS) { 1084 Handle receiver; 1085 Handle nullHandle; //create a handy null handle for exception returns 1086 1087 assert(!vfst.at_end(), "Java frame must exist"); 1088 1089 // Find caller and bci from vframe 1090 methodHandle caller(THREAD, vfst.method()); 1091 int bci = vfst.bci(); 1092 1093 Bytecode_invoke bytecode(caller, bci); 1094 int bytecode_index = bytecode.index(); 1095 1096 methodHandle attached_method = extract_attached_method(vfst); 1097 if (attached_method.not_null()) { 1098 methodHandle callee = bytecode.static_target(CHECK_NH); 1099 vmIntrinsics::ID id = callee->intrinsic_id(); 1100 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call, 1101 // it attaches statically resolved method to the call site. 1102 if (MethodHandles::is_signature_polymorphic(id) && 1103 MethodHandles::is_signature_polymorphic_intrinsic(id)) { 1104 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id); 1105 1106 // Adjust invocation mode according to the attached method. 1107 switch (bc) { 1108 case Bytecodes::_invokeinterface: 1109 if (!attached_method->method_holder()->is_interface()) { 1110 bc = Bytecodes::_invokevirtual; 1111 } 1112 break; 1113 case Bytecodes::_invokehandle: 1114 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) { 1115 bc = attached_method->is_static() ? Bytecodes::_invokestatic 1116 : Bytecodes::_invokevirtual; 1117 } 1118 break; 1119 default: 1120 break; 1121 } 1122 } 1123 } else { 1124 bc = bytecode.invoke_code(); 1125 } 1126 1127 bool has_receiver = bc != Bytecodes::_invokestatic && 1128 bc != Bytecodes::_invokedynamic && 1129 bc != Bytecodes::_invokehandle; 1130 1131 // Find receiver for non-static call 1132 if (has_receiver) { 1133 // This register map must be update since we need to find the receiver for 1134 // compiled frames. The receiver might be in a register. 1135 RegisterMap reg_map2(thread); 1136 frame stubFrame = thread->last_frame(); 1137 // Caller-frame is a compiled frame 1138 frame callerFrame = stubFrame.sender(®_map2); 1139 1140 if (attached_method.is_null()) { 1141 methodHandle callee = bytecode.static_target(CHECK_NH); 1142 if (callee.is_null()) { 1143 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle); 1144 } 1145 } 1146 1147 // Retrieve from a compiled argument list 1148 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2)); 1149 1150 if (receiver.is_null()) { 1151 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle); 1152 } 1153 } 1154 1155 // Resolve method 1156 if (attached_method.not_null()) { 1157 // Parameterized by attached method. 1158 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH); 1159 } else { 1160 // Parameterized by bytecode. 1161 constantPoolHandle constants(THREAD, caller->constants()); 1162 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH); 1163 } 1164 1165 #ifdef ASSERT 1166 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls 1167 if (has_receiver) { 1168 assert(receiver.not_null(), "should have thrown exception"); 1169 Klass* receiver_klass = receiver->klass(); 1170 Klass* rk = NULL; 1171 if (attached_method.not_null()) { 1172 // In case there's resolved method attached, use its holder during the check. 1173 rk = attached_method->method_holder(); 1174 } else { 1175 // Klass is already loaded. 1176 constantPoolHandle constants(THREAD, caller->constants()); 1177 rk = constants->klass_ref_at(bytecode_index, CHECK_NH); 1178 } 1179 Klass* static_receiver_klass = rk; 1180 methodHandle callee = callinfo.selected_method(); 1181 assert(receiver_klass->is_subtype_of(static_receiver_klass), 1182 "actual receiver must be subclass of static receiver klass"); 1183 if (receiver_klass->is_instance_klass()) { 1184 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) { 1185 tty->print_cr("ERROR: Klass not yet initialized!!"); 1186 receiver_klass->print(); 1187 } 1188 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized"); 1189 } 1190 } 1191 #endif 1192 1193 return receiver; 1194 } 1195 1196 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) { 1197 ResourceMark rm(THREAD); 1198 // We need first to check if any Java activations (compiled, interpreted) 1199 // exist on the stack since last JavaCall. If not, we need 1200 // to get the target method from the JavaCall wrapper. 1201 vframeStream vfst(thread, true); // Do not skip any javaCalls 1202 methodHandle callee_method; 1203 if (vfst.at_end()) { 1204 // No Java frames were found on stack since we did the JavaCall. 1205 // Hence the stack can only contain an entry_frame. We need to 1206 // find the target method from the stub frame. 1207 RegisterMap reg_map(thread, false); 1208 frame fr = thread->last_frame(); 1209 assert(fr.is_runtime_frame(), "must be a runtimeStub"); 1210 fr = fr.sender(®_map); 1211 assert(fr.is_entry_frame(), "must be"); 1212 // fr is now pointing to the entry frame. 1213 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method()); 1214 } else { 1215 Bytecodes::Code bc; 1216 CallInfo callinfo; 1217 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle())); 1218 callee_method = callinfo.selected_method(); 1219 } 1220 assert(callee_method()->is_method(), "must be"); 1221 return callee_method; 1222 } 1223 1224 // Resolves a call. 1225 methodHandle SharedRuntime::resolve_helper(JavaThread *thread, 1226 bool is_virtual, 1227 bool is_optimized, TRAPS) { 1228 methodHandle callee_method; 1229 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1230 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 1231 int retry_count = 0; 1232 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() && 1233 callee_method->method_holder() != SystemDictionary::Object_klass()) { 1234 // If has a pending exception then there is no need to re-try to 1235 // resolve this method. 1236 // If the method has been redefined, we need to try again. 1237 // Hack: we have no way to update the vtables of arrays, so don't 1238 // require that java.lang.Object has been updated. 1239 1240 // It is very unlikely that method is redefined more than 100 times 1241 // in the middle of resolve. If it is looping here more than 100 times 1242 // means then there could be a bug here. 1243 guarantee((retry_count++ < 100), 1244 "Could not resolve to latest version of redefined method"); 1245 // method is redefined in the middle of resolve so re-try. 1246 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1247 } 1248 } 1249 return callee_method; 1250 } 1251 1252 // Resolves a call. The compilers generate code for calls that go here 1253 // and are patched with the real destination of the call. 1254 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread, 1255 bool is_virtual, 1256 bool is_optimized, TRAPS) { 1257 1258 ResourceMark rm(thread); 1259 RegisterMap cbl_map(thread, false); 1260 frame caller_frame = thread->last_frame().sender(&cbl_map); 1261 1262 CodeBlob* caller_cb = caller_frame.cb(); 1263 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method"); 1264 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null(); 1265 1266 // make sure caller is not getting deoptimized 1267 // and removed before we are done with it. 1268 // CLEANUP - with lazy deopt shouldn't need this lock 1269 nmethodLocker caller_lock(caller_nm); 1270 1271 // determine call info & receiver 1272 // note: a) receiver is NULL for static calls 1273 // b) an exception is thrown if receiver is NULL for non-static calls 1274 CallInfo call_info; 1275 Bytecodes::Code invoke_code = Bytecodes::_illegal; 1276 Handle receiver = find_callee_info(thread, invoke_code, 1277 call_info, CHECK_(methodHandle())); 1278 methodHandle callee_method = call_info.selected_method(); 1279 1280 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) || 1281 (!is_virtual && invoke_code == Bytecodes::_invokespecial) || 1282 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) || 1283 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) || 1284 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode"); 1285 1286 assert(caller_nm->is_alive(), "It should be alive"); 1287 1288 #ifndef PRODUCT 1289 // tracing/debugging/statistics 1290 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) : 1291 (is_virtual) ? (&_resolve_virtual_ctr) : 1292 (&_resolve_static_ctr); 1293 Atomic::inc(addr); 1294 1295 if (TraceCallFixup) { 1296 ResourceMark rm(thread); 1297 tty->print("resolving %s%s (%s) call to", 1298 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static", 1299 Bytecodes::name(invoke_code)); 1300 callee_method->print_short_name(tty); 1301 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, 1302 p2i(caller_frame.pc()), p2i(callee_method->code())); 1303 } 1304 #endif 1305 1306 // JSR 292 key invariant: 1307 // If the resolved method is a MethodHandle invoke target, the call 1308 // site must be a MethodHandle call site, because the lambda form might tail-call 1309 // leaving the stack in a state unknown to either caller or callee 1310 // TODO detune for now but we might need it again 1311 // assert(!callee_method->is_compiled_lambda_form() || 1312 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site"); 1313 1314 // Compute entry points. This might require generation of C2I converter 1315 // frames, so we cannot be holding any locks here. Furthermore, the 1316 // computation of the entry points is independent of patching the call. We 1317 // always return the entry-point, but we only patch the stub if the call has 1318 // not been deoptimized. Return values: For a virtual call this is an 1319 // (cached_oop, destination address) pair. For a static call/optimized 1320 // virtual this is just a destination address. 1321 1322 StaticCallInfo static_call_info; 1323 CompiledICInfo virtual_call_info; 1324 1325 // Make sure the callee nmethod does not get deoptimized and removed before 1326 // we are done patching the code. 1327 CompiledMethod* callee = callee_method->code(); 1328 1329 if (callee != NULL) { 1330 assert(callee->is_compiled(), "must be nmethod for patching"); 1331 } 1332 1333 if (callee != NULL && !callee->is_in_use()) { 1334 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded. 1335 callee = NULL; 1336 } 1337 nmethodLocker nl_callee(callee); 1338 #ifdef ASSERT 1339 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below 1340 #endif 1341 1342 bool is_nmethod = caller_nm->is_nmethod(); 1343 1344 if (is_virtual) { 1345 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check"); 1346 bool static_bound = call_info.resolved_method()->can_be_statically_bound(); 1347 Klass* klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass(); 1348 CompiledIC::compute_monomorphic_entry(callee_method, klass, 1349 is_optimized, static_bound, is_nmethod, virtual_call_info, 1350 CHECK_(methodHandle())); 1351 } else { 1352 // static call 1353 CompiledStaticCall::compute_entry(callee_method, is_nmethod, static_call_info); 1354 } 1355 1356 // grab lock, check for deoptimization and potentially patch caller 1357 { 1358 MutexLocker ml_patch(CompiledIC_lock); 1359 1360 // Lock blocks for safepoint during which both nmethods can change state. 1361 1362 // Now that we are ready to patch if the Method* was redefined then 1363 // don't update call site and let the caller retry. 1364 // Don't update call site if callee nmethod was unloaded or deoptimized. 1365 // Don't update call site if callee nmethod was replaced by an other nmethod 1366 // which may happen when multiply alive nmethod (tiered compilation) 1367 // will be supported. 1368 if (!callee_method->is_old() && 1369 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) { 1370 #ifdef ASSERT 1371 // We must not try to patch to jump to an already unloaded method. 1372 if (dest_entry_point != 0) { 1373 CodeBlob* cb = CodeCache::find_blob(dest_entry_point); 1374 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee), 1375 "should not call unloaded nmethod"); 1376 } 1377 #endif 1378 if (is_virtual) { 1379 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc()); 1380 if (inline_cache->is_clean()) { 1381 inline_cache->set_to_monomorphic(virtual_call_info); 1382 } 1383 } else { 1384 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc()); 1385 if (ssc->is_clean()) ssc->set(static_call_info); 1386 } 1387 } 1388 1389 } // unlock CompiledIC_lock 1390 1391 return callee_method; 1392 } 1393 1394 1395 // Inline caches exist only in compiled code 1396 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread)) 1397 #ifdef ASSERT 1398 RegisterMap reg_map(thread, false); 1399 frame stub_frame = thread->last_frame(); 1400 assert(stub_frame.is_runtime_frame(), "sanity check"); 1401 frame caller_frame = stub_frame.sender(®_map); 1402 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame"); 1403 #endif /* ASSERT */ 1404 1405 methodHandle callee_method; 1406 JRT_BLOCK 1407 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL); 1408 // Return Method* through TLS 1409 thread->set_vm_result_2(callee_method()); 1410 JRT_BLOCK_END 1411 // return compiled code entry point after potential safepoints 1412 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1413 return callee_method->verified_code_entry(); 1414 JRT_END 1415 1416 1417 // Handle call site that has been made non-entrant 1418 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread)) 1419 // 6243940 We might end up in here if the callee is deoptimized 1420 // as we race to call it. We don't want to take a safepoint if 1421 // the caller was interpreted because the caller frame will look 1422 // interpreted to the stack walkers and arguments are now 1423 // "compiled" so it is much better to make this transition 1424 // invisible to the stack walking code. The i2c path will 1425 // place the callee method in the callee_target. It is stashed 1426 // there because if we try and find the callee by normal means a 1427 // safepoint is possible and have trouble gc'ing the compiled args. 1428 RegisterMap reg_map(thread, false); 1429 frame stub_frame = thread->last_frame(); 1430 assert(stub_frame.is_runtime_frame(), "sanity check"); 1431 frame caller_frame = stub_frame.sender(®_map); 1432 1433 if (caller_frame.is_interpreted_frame() || 1434 caller_frame.is_entry_frame()) { 1435 Method* callee = thread->callee_target(); 1436 guarantee(callee != NULL && callee->is_method(), "bad handshake"); 1437 thread->set_vm_result_2(callee); 1438 thread->set_callee_target(NULL); 1439 return callee->get_c2i_entry(); 1440 } 1441 1442 // Must be compiled to compiled path which is safe to stackwalk 1443 methodHandle callee_method; 1444 JRT_BLOCK 1445 // Force resolving of caller (if we called from compiled frame) 1446 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL); 1447 thread->set_vm_result_2(callee_method()); 1448 JRT_BLOCK_END 1449 // return compiled code entry point after potential safepoints 1450 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1451 return callee_method->verified_code_entry(); 1452 JRT_END 1453 1454 // Handle abstract method call 1455 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread)) 1456 return StubRoutines::throw_AbstractMethodError_entry(); 1457 JRT_END 1458 1459 1460 // resolve a static call and patch code 1461 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread )) 1462 methodHandle callee_method; 1463 JRT_BLOCK 1464 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL); 1465 thread->set_vm_result_2(callee_method()); 1466 JRT_BLOCK_END 1467 // return compiled code entry point after potential safepoints 1468 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1469 return callee_method->verified_code_entry(); 1470 JRT_END 1471 1472 1473 // resolve virtual call and update inline cache to monomorphic 1474 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread )) 1475 methodHandle callee_method; 1476 JRT_BLOCK 1477 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL); 1478 thread->set_vm_result_2(callee_method()); 1479 JRT_BLOCK_END 1480 // return compiled code entry point after potential safepoints 1481 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1482 return callee_method->verified_code_entry(); 1483 JRT_END 1484 1485 1486 // Resolve a virtual call that can be statically bound (e.g., always 1487 // monomorphic, so it has no inline cache). Patch code to resolved target. 1488 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread)) 1489 methodHandle callee_method; 1490 JRT_BLOCK 1491 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL); 1492 thread->set_vm_result_2(callee_method()); 1493 JRT_BLOCK_END 1494 // return compiled code entry point after potential safepoints 1495 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1496 return callee_method->verified_code_entry(); 1497 JRT_END 1498 1499 1500 1501 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) { 1502 ResourceMark rm(thread); 1503 CallInfo call_info; 1504 Bytecodes::Code bc; 1505 1506 // receiver is NULL for static calls. An exception is thrown for NULL 1507 // receivers for non-static calls 1508 Handle receiver = find_callee_info(thread, bc, call_info, 1509 CHECK_(methodHandle())); 1510 // Compiler1 can produce virtual call sites that can actually be statically bound 1511 // If we fell thru to below we would think that the site was going megamorphic 1512 // when in fact the site can never miss. Worse because we'd think it was megamorphic 1513 // we'd try and do a vtable dispatch however methods that can be statically bound 1514 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a 1515 // reresolution of the call site (as if we did a handle_wrong_method and not an 1516 // plain ic_miss) and the site will be converted to an optimized virtual call site 1517 // never to miss again. I don't believe C2 will produce code like this but if it 1518 // did this would still be the correct thing to do for it too, hence no ifdef. 1519 // 1520 if (call_info.resolved_method()->can_be_statically_bound()) { 1521 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle())); 1522 if (TraceCallFixup) { 1523 RegisterMap reg_map(thread, false); 1524 frame caller_frame = thread->last_frame().sender(®_map); 1525 ResourceMark rm(thread); 1526 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc)); 1527 callee_method->print_short_name(tty); 1528 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc())); 1529 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1530 } 1531 return callee_method; 1532 } 1533 1534 methodHandle callee_method = call_info.selected_method(); 1535 1536 bool should_be_mono = false; 1537 1538 #ifndef PRODUCT 1539 Atomic::inc(&_ic_miss_ctr); 1540 1541 // Statistics & Tracing 1542 if (TraceCallFixup) { 1543 ResourceMark rm(thread); 1544 tty->print("IC miss (%s) call to", Bytecodes::name(bc)); 1545 callee_method->print_short_name(tty); 1546 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1547 } 1548 1549 if (ICMissHistogram) { 1550 MutexLocker m(VMStatistic_lock); 1551 RegisterMap reg_map(thread, false); 1552 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub 1553 // produce statistics under the lock 1554 trace_ic_miss(f.pc()); 1555 } 1556 #endif 1557 1558 // install an event collector so that when a vtable stub is created the 1559 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The 1560 // event can't be posted when the stub is created as locks are held 1561 // - instead the event will be deferred until the event collector goes 1562 // out of scope. 1563 JvmtiDynamicCodeEventCollector event_collector; 1564 1565 // Update inline cache to megamorphic. Skip update if we are called from interpreted. 1566 { MutexLocker ml_patch (CompiledIC_lock); 1567 RegisterMap reg_map(thread, false); 1568 frame caller_frame = thread->last_frame().sender(®_map); 1569 CodeBlob* cb = caller_frame.cb(); 1570 CompiledMethod* caller_nm = cb->as_compiled_method_or_null(); 1571 if (cb->is_compiled()) { 1572 CompiledIC* inline_cache = CompiledIC_before(((CompiledMethod*)cb), caller_frame.pc()); 1573 bool should_be_mono = false; 1574 if (inline_cache->is_optimized()) { 1575 if (TraceCallFixup) { 1576 ResourceMark rm(thread); 1577 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc)); 1578 callee_method->print_short_name(tty); 1579 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1580 } 1581 should_be_mono = true; 1582 } else if (inline_cache->is_icholder_call()) { 1583 CompiledICHolder* ic_oop = inline_cache->cached_icholder(); 1584 if (ic_oop != NULL) { 1585 1586 if (receiver()->klass() == ic_oop->holder_klass()) { 1587 // This isn't a real miss. We must have seen that compiled code 1588 // is now available and we want the call site converted to a 1589 // monomorphic compiled call site. 1590 // We can't assert for callee_method->code() != NULL because it 1591 // could have been deoptimized in the meantime 1592 if (TraceCallFixup) { 1593 ResourceMark rm(thread); 1594 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc)); 1595 callee_method->print_short_name(tty); 1596 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1597 } 1598 should_be_mono = true; 1599 } 1600 } 1601 } 1602 1603 if (should_be_mono) { 1604 1605 // We have a path that was monomorphic but was going interpreted 1606 // and now we have (or had) a compiled entry. We correct the IC 1607 // by using a new icBuffer. 1608 CompiledICInfo info; 1609 Klass* receiver_klass = receiver()->klass(); 1610 inline_cache->compute_monomorphic_entry(callee_method, 1611 receiver_klass, 1612 inline_cache->is_optimized(), 1613 false, caller_nm->is_nmethod(), 1614 info, CHECK_(methodHandle())); 1615 inline_cache->set_to_monomorphic(info); 1616 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) { 1617 // Potential change to megamorphic 1618 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle())); 1619 if (!successful) { 1620 inline_cache->set_to_clean(); 1621 } 1622 } else { 1623 // Either clean or megamorphic 1624 } 1625 } else { 1626 fatal("Unimplemented"); 1627 } 1628 } // Release CompiledIC_lock 1629 1630 return callee_method; 1631 } 1632 1633 // 1634 // Resets a call-site in compiled code so it will get resolved again. 1635 // This routines handles both virtual call sites, optimized virtual call 1636 // sites, and static call sites. Typically used to change a call sites 1637 // destination from compiled to interpreted. 1638 // 1639 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) { 1640 ResourceMark rm(thread); 1641 RegisterMap reg_map(thread, false); 1642 frame stub_frame = thread->last_frame(); 1643 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub"); 1644 frame caller = stub_frame.sender(®_map); 1645 1646 // Do nothing if the frame isn't a live compiled frame. 1647 // nmethod could be deoptimized by the time we get here 1648 // so no update to the caller is needed. 1649 1650 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) { 1651 1652 address pc = caller.pc(); 1653 1654 // Check for static or virtual call 1655 bool is_static_call = false; 1656 CompiledMethod* caller_nm = CodeCache::find_compiled(pc); 1657 1658 // Default call_addr is the location of the "basic" call. 1659 // Determine the address of the call we a reresolving. With 1660 // Inline Caches we will always find a recognizable call. 1661 // With Inline Caches disabled we may or may not find a 1662 // recognizable call. We will always find a call for static 1663 // calls and for optimized virtual calls. For vanilla virtual 1664 // calls it depends on the state of the UseInlineCaches switch. 1665 // 1666 // With Inline Caches disabled we can get here for a virtual call 1667 // for two reasons: 1668 // 1 - calling an abstract method. The vtable for abstract methods 1669 // will run us thru handle_wrong_method and we will eventually 1670 // end up in the interpreter to throw the ame. 1671 // 2 - a racing deoptimization. We could be doing a vanilla vtable 1672 // call and between the time we fetch the entry address and 1673 // we jump to it the target gets deoptimized. Similar to 1 1674 // we will wind up in the interprter (thru a c2i with c2). 1675 // 1676 address call_addr = NULL; 1677 { 1678 // Get call instruction under lock because another thread may be 1679 // busy patching it. 1680 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1681 // Location of call instruction 1682 call_addr = caller_nm->call_instruction_address(pc); 1683 } 1684 // Make sure nmethod doesn't get deoptimized and removed until 1685 // this is done with it. 1686 // CLEANUP - with lazy deopt shouldn't need this lock 1687 nmethodLocker nmlock(caller_nm); 1688 1689 if (call_addr != NULL) { 1690 RelocIterator iter(caller_nm, call_addr, call_addr+1); 1691 int ret = iter.next(); // Get item 1692 if (ret) { 1693 assert(iter.addr() == call_addr, "must find call"); 1694 if (iter.type() == relocInfo::static_call_type) { 1695 is_static_call = true; 1696 } else { 1697 assert(iter.type() == relocInfo::virtual_call_type || 1698 iter.type() == relocInfo::opt_virtual_call_type 1699 , "unexpected relocInfo. type"); 1700 } 1701 } else { 1702 assert(!UseInlineCaches, "relocation info. must exist for this address"); 1703 } 1704 1705 // Cleaning the inline cache will force a new resolve. This is more robust 1706 // than directly setting it to the new destination, since resolving of calls 1707 // is always done through the same code path. (experience shows that it 1708 // leads to very hard to track down bugs, if an inline cache gets updated 1709 // to a wrong method). It should not be performance critical, since the 1710 // resolve is only done once. 1711 1712 bool is_nmethod = caller_nm->is_nmethod(); 1713 MutexLocker ml(CompiledIC_lock); 1714 if (is_static_call) { 1715 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr); 1716 ssc->set_to_clean(); 1717 } else { 1718 // compiled, dispatched call (which used to call an interpreted method) 1719 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr); 1720 inline_cache->set_to_clean(); 1721 } 1722 } 1723 } 1724 1725 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle())); 1726 1727 1728 #ifndef PRODUCT 1729 Atomic::inc(&_wrong_method_ctr); 1730 1731 if (TraceCallFixup) { 1732 ResourceMark rm(thread); 1733 tty->print("handle_wrong_method reresolving call to"); 1734 callee_method->print_short_name(tty); 1735 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code())); 1736 } 1737 #endif 1738 1739 return callee_method; 1740 } 1741 1742 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) { 1743 // The faulting unsafe accesses should be changed to throw the error 1744 // synchronously instead. Meanwhile the faulting instruction will be 1745 // skipped over (effectively turning it into a no-op) and an 1746 // asynchronous exception will be raised which the thread will 1747 // handle at a later point. If the instruction is a load it will 1748 // return garbage. 1749 1750 // Request an async exception. 1751 thread->set_pending_unsafe_access_error(); 1752 1753 // Return address of next instruction to execute. 1754 return next_pc; 1755 } 1756 1757 #ifdef ASSERT 1758 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method, 1759 const BasicType* sig_bt, 1760 const VMRegPair* regs) { 1761 ResourceMark rm; 1762 const int total_args_passed = method->size_of_parameters(); 1763 const VMRegPair* regs_with_member_name = regs; 1764 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1); 1765 1766 const int member_arg_pos = total_args_passed - 1; 1767 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob"); 1768 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object"); 1769 1770 const bool is_outgoing = method->is_method_handle_intrinsic(); 1771 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing); 1772 1773 for (int i = 0; i < member_arg_pos; i++) { 1774 VMReg a = regs_with_member_name[i].first(); 1775 VMReg b = regs_without_member_name[i].first(); 1776 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value()); 1777 } 1778 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg"); 1779 } 1780 #endif 1781 1782 bool SharedRuntime::should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb) { 1783 if (destination != entry_point) { 1784 CodeBlob* callee = CodeCache::find_blob(destination); 1785 // callee == cb seems weird. It means calling interpreter thru stub. 1786 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) { 1787 // static call or optimized virtual 1788 if (TraceCallFixup) { 1789 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1790 moop->print_short_name(tty); 1791 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1792 } 1793 return true; 1794 } else { 1795 if (TraceCallFixup) { 1796 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc)); 1797 moop->print_short_name(tty); 1798 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point)); 1799 } 1800 // assert is too strong could also be resolve destinations. 1801 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be"); 1802 } 1803 } else { 1804 if (TraceCallFixup) { 1805 tty->print("already patched 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 } 1810 return false; 1811 } 1812 1813 // --------------------------------------------------------------------------- 1814 // We are calling the interpreter via a c2i. Normally this would mean that 1815 // we were called by a compiled method. However we could have lost a race 1816 // where we went int -> i2c -> c2i and so the caller could in fact be 1817 // interpreted. If the caller is compiled we attempt to patch the caller 1818 // so he no longer calls into the interpreter. 1819 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc)) 1820 Method* moop(method); 1821 1822 address entry_point = moop->from_compiled_entry_no_trampoline(); 1823 1824 // It's possible that deoptimization can occur at a call site which hasn't 1825 // been resolved yet, in which case this function will be called from 1826 // an nmethod that has been patched for deopt and we can ignore the 1827 // request for a fixup. 1828 // Also it is possible that we lost a race in that from_compiled_entry 1829 // is now back to the i2c in that case we don't need to patch and if 1830 // we did we'd leap into space because the callsite needs to use 1831 // "to interpreter" stub in order to load up the Method*. Don't 1832 // ask me how I know this... 1833 1834 CodeBlob* cb = CodeCache::find_blob(caller_pc); 1835 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) { 1836 return; 1837 } 1838 1839 // The check above makes sure this is a nmethod. 1840 CompiledMethod* nm = cb->as_compiled_method_or_null(); 1841 assert(nm, "must be"); 1842 1843 // Get the return PC for the passed caller PC. 1844 address return_pc = caller_pc + frame::pc_return_offset; 1845 1846 // There is a benign race here. We could be attempting to patch to a compiled 1847 // entry point at the same time the callee is being deoptimized. If that is 1848 // the case then entry_point may in fact point to a c2i and we'd patch the 1849 // call site with the same old data. clear_code will set code() to NULL 1850 // at the end of it. If we happen to see that NULL then we can skip trying 1851 // to patch. If we hit the window where the callee has a c2i in the 1852 // from_compiled_entry and the NULL isn't present yet then we lose the race 1853 // and patch the code with the same old data. Asi es la vida. 1854 1855 if (moop->code() == NULL) return; 1856 1857 if (nm->is_in_use()) { 1858 1859 // Expect to find a native call there (unless it was no-inline cache vtable dispatch) 1860 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1861 if (NativeCall::is_call_before(return_pc)) { 1862 ResourceMark mark; 1863 NativeCallWrapper* call = nm->call_wrapper_before(return_pc); 1864 // 1865 // bug 6281185. We might get here after resolving a call site to a vanilla 1866 // virtual call. Because the resolvee uses the verified entry it may then 1867 // see compiled code and attempt to patch the site by calling us. This would 1868 // then incorrectly convert the call site to optimized and its downhill from 1869 // there. If you're lucky you'll get the assert in the bugid, if not you've 1870 // just made a call site that could be megamorphic into a monomorphic site 1871 // for the rest of its life! Just another racing bug in the life of 1872 // fixup_callers_callsite ... 1873 // 1874 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address()); 1875 iter.next(); 1876 assert(iter.has_current(), "must have a reloc at java call site"); 1877 relocInfo::relocType typ = iter.reloc()->type(); 1878 if (typ != relocInfo::static_call_type && 1879 typ != relocInfo::opt_virtual_call_type && 1880 typ != relocInfo::static_stub_type) { 1881 return; 1882 } 1883 address destination = call->destination(); 1884 if (should_fixup_call_destination(destination, entry_point, caller_pc, moop, cb)) { 1885 call->set_destination_mt_safe(entry_point); 1886 } 1887 } 1888 } 1889 IRT_END 1890 1891 1892 // same as JVM_Arraycopy, but called directly from compiled code 1893 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos, 1894 oopDesc* dest, jint dest_pos, 1895 jint length, 1896 JavaThread* thread)) { 1897 #ifndef PRODUCT 1898 _slow_array_copy_ctr++; 1899 #endif 1900 // Check if we have null pointers 1901 if (src == NULL || dest == NULL) { 1902 THROW(vmSymbols::java_lang_NullPointerException()); 1903 } 1904 // Do the copy. The casts to arrayOop are necessary to the copy_array API, 1905 // even though the copy_array API also performs dynamic checks to ensure 1906 // that src and dest are truly arrays (and are conformable). 1907 // The copy_array mechanism is awkward and could be removed, but 1908 // the compilers don't call this function except as a last resort, 1909 // so it probably doesn't matter. 1910 src->klass()->copy_array((arrayOopDesc*)src, src_pos, 1911 (arrayOopDesc*)dest, dest_pos, 1912 length, thread); 1913 } 1914 JRT_END 1915 1916 // The caller of generate_class_cast_message() (or one of its callers) 1917 // must use a ResourceMark in order to correctly free the result. 1918 char* SharedRuntime::generate_class_cast_message( 1919 JavaThread* thread, Klass* caster_klass) { 1920 1921 // Get target class name from the checkcast instruction 1922 vframeStream vfst(thread, true); 1923 assert(!vfst.at_end(), "Java frame must exist"); 1924 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci())); 1925 Klass* target_klass = vfst.method()->constants()->klass_at( 1926 cc.index(), thread); 1927 return generate_class_cast_message(caster_klass, target_klass); 1928 } 1929 1930 // The caller of class_loader_and_module_name() (or one of its callers) 1931 // must use a ResourceMark in order to correctly free the result. 1932 const char* class_loader_and_module_name(Klass* klass) { 1933 const char* delim = "/"; 1934 size_t delim_len = strlen(delim); 1935 1936 const char* fqn = klass->external_name(); 1937 // Length of message to return; always include FQN 1938 size_t msglen = strlen(fqn) + 1; 1939 1940 bool has_cl_name = false; 1941 bool has_mod_name = false; 1942 bool has_version = false; 1943 1944 // Use class loader name, if exists and not builtin 1945 const char* class_loader_name = ""; 1946 ClassLoaderData* cld = klass->class_loader_data(); 1947 assert(cld != NULL, "class_loader_data should not be NULL"); 1948 if (!cld->is_builtin_class_loader_data()) { 1949 // If not builtin, look for name 1950 oop loader = klass->class_loader(); 1951 if (loader != NULL) { 1952 oop class_loader_name_oop = java_lang_ClassLoader::name(loader); 1953 if (class_loader_name_oop != NULL) { 1954 class_loader_name = java_lang_String::as_utf8_string(class_loader_name_oop); 1955 if (class_loader_name != NULL && class_loader_name[0] != '\0') { 1956 has_cl_name = true; 1957 msglen += strlen(class_loader_name) + delim_len; 1958 } 1959 } 1960 } 1961 } 1962 1963 const char* module_name = ""; 1964 const char* version = ""; 1965 Klass* bottom_klass = klass->is_objArray_klass() ? 1966 ObjArrayKlass::cast(klass)->bottom_klass() : klass; 1967 if (bottom_klass->is_instance_klass()) { 1968 ModuleEntry* module = InstanceKlass::cast(bottom_klass)->module(); 1969 // Use module name, if exists 1970 if (module->is_named()) { 1971 has_mod_name = true; 1972 module_name = module->name()->as_C_string(); 1973 msglen += strlen(module_name); 1974 // Use version if exists and is not a jdk module 1975 if (module->is_non_jdk_module() && module->version() != NULL) { 1976 has_version = true; 1977 version = module->version()->as_C_string(); 1978 msglen += strlen("@") + strlen(version); 1979 } 1980 } 1981 } else { 1982 // klass is an array of primitives, so its module is java.base 1983 module_name = JAVA_BASE_NAME; 1984 } 1985 1986 if (has_cl_name || has_mod_name) { 1987 msglen += delim_len; 1988 } 1989 1990 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen); 1991 1992 // Just return the FQN if error in allocating string 1993 if (message == NULL) { 1994 return fqn; 1995 } 1996 1997 jio_snprintf(message, msglen, "%s%s%s%s%s%s%s", 1998 class_loader_name, 1999 (has_cl_name) ? delim : "", 2000 (has_mod_name) ? module_name : "", 2001 (has_version) ? "@" : "", 2002 (has_version) ? version : "", 2003 (has_cl_name || has_mod_name) ? delim : "", 2004 fqn); 2005 return message; 2006 } 2007 2008 char* SharedRuntime::generate_class_cast_message( 2009 Klass* caster_klass, Klass* target_klass) { 2010 2011 const char* caster_name = class_loader_and_module_name(caster_klass); 2012 2013 const char* target_name = class_loader_and_module_name(target_klass); 2014 2015 size_t msglen = strlen(caster_name) + strlen(" cannot be cast to ") + strlen(target_name) + 1; 2016 2017 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen); 2018 if (message == NULL) { 2019 // Shouldn't happen, but don't cause even more problems if it does 2020 message = const_cast<char*>(caster_klass->external_name()); 2021 } else { 2022 jio_snprintf(message, 2023 msglen, 2024 "%s cannot be cast to %s", 2025 caster_name, 2026 target_name); 2027 } 2028 return message; 2029 } 2030 2031 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages()) 2032 (void) JavaThread::current()->reguard_stack(); 2033 JRT_END 2034 2035 2036 // Handles the uncommon case in locking, i.e., contention or an inflated lock. 2037 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread)) 2038 // Disable ObjectSynchronizer::quick_enter() in default config 2039 // on AARCH64 and ARM until JDK-8153107 is resolved. 2040 if (ARM_ONLY((SyncFlags & 256) != 0 &&) 2041 AARCH64_ONLY((SyncFlags & 256) != 0 &&) 2042 !SafepointSynchronize::is_synchronizing()) { 2043 // Only try quick_enter() if we're not trying to reach a safepoint 2044 // so that the calling thread reaches the safepoint more quickly. 2045 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return; 2046 } 2047 // NO_ASYNC required because an async exception on the state transition destructor 2048 // would leave you with the lock held and it would never be released. 2049 // The normal monitorenter NullPointerException is thrown without acquiring a lock 2050 // and the model is that an exception implies the method failed. 2051 JRT_BLOCK_NO_ASYNC 2052 oop obj(_obj); 2053 if (PrintBiasedLockingStatistics) { 2054 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 2055 } 2056 Handle h_obj(THREAD, obj); 2057 if (UseBiasedLocking) { 2058 // Retry fast entry if bias is revoked to avoid unnecessary inflation 2059 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK); 2060 } else { 2061 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK); 2062 } 2063 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here"); 2064 JRT_BLOCK_END 2065 JRT_END 2066 2067 // Handles the uncommon cases of monitor unlocking in compiled code 2068 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD)) 2069 oop obj(_obj); 2070 assert(JavaThread::current() == THREAD, "invariant"); 2071 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore 2072 // testing was unable to ever fire the assert that guarded it so I have removed it. 2073 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?"); 2074 #undef MIGHT_HAVE_PENDING 2075 #ifdef MIGHT_HAVE_PENDING 2076 // Save and restore any pending_exception around the exception mark. 2077 // While the slow_exit must not throw an exception, we could come into 2078 // this routine with one set. 2079 oop pending_excep = NULL; 2080 const char* pending_file; 2081 int pending_line; 2082 if (HAS_PENDING_EXCEPTION) { 2083 pending_excep = PENDING_EXCEPTION; 2084 pending_file = THREAD->exception_file(); 2085 pending_line = THREAD->exception_line(); 2086 CLEAR_PENDING_EXCEPTION; 2087 } 2088 #endif /* MIGHT_HAVE_PENDING */ 2089 2090 { 2091 // Exit must be non-blocking, and therefore no exceptions can be thrown. 2092 EXCEPTION_MARK; 2093 ObjectSynchronizer::slow_exit(obj, lock, THREAD); 2094 } 2095 2096 #ifdef MIGHT_HAVE_PENDING 2097 if (pending_excep != NULL) { 2098 THREAD->set_pending_exception(pending_excep, pending_file, pending_line); 2099 } 2100 #endif /* MIGHT_HAVE_PENDING */ 2101 JRT_END 2102 2103 #ifndef PRODUCT 2104 2105 void SharedRuntime::print_statistics() { 2106 ttyLocker ttyl; 2107 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'"); 2108 2109 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr); 2110 2111 SharedRuntime::print_ic_miss_histogram(); 2112 2113 if (CountRemovableExceptions) { 2114 if (_nof_removable_exceptions > 0) { 2115 Unimplemented(); // this counter is not yet incremented 2116 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions); 2117 } 2118 } 2119 2120 // Dump the JRT_ENTRY counters 2121 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr); 2122 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr); 2123 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr); 2124 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr); 2125 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr); 2126 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr); 2127 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr); 2128 2129 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr); 2130 tty->print_cr("%5d wrong method", _wrong_method_ctr); 2131 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr); 2132 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr); 2133 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr); 2134 2135 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr); 2136 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr); 2137 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr); 2138 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr); 2139 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr); 2140 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr); 2141 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr); 2142 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr); 2143 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr); 2144 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr); 2145 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr); 2146 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr); 2147 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr); 2148 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr); 2149 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr); 2150 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr); 2151 2152 AdapterHandlerLibrary::print_statistics(); 2153 2154 if (xtty != NULL) xtty->tail("statistics"); 2155 } 2156 2157 inline double percent(int x, int y) { 2158 return 100.0 * x / MAX2(y, 1); 2159 } 2160 2161 class MethodArityHistogram { 2162 public: 2163 enum { MAX_ARITY = 256 }; 2164 private: 2165 static int _arity_histogram[MAX_ARITY]; // histogram of #args 2166 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words 2167 static int _max_arity; // max. arity seen 2168 static int _max_size; // max. arg size seen 2169 2170 static void add_method_to_histogram(nmethod* nm) { 2171 Method* m = nm->method(); 2172 ArgumentCount args(m->signature()); 2173 int arity = args.size() + (m->is_static() ? 0 : 1); 2174 int argsize = m->size_of_parameters(); 2175 arity = MIN2(arity, MAX_ARITY-1); 2176 argsize = MIN2(argsize, MAX_ARITY-1); 2177 int count = nm->method()->compiled_invocation_count(); 2178 _arity_histogram[arity] += count; 2179 _size_histogram[argsize] += count; 2180 _max_arity = MAX2(_max_arity, arity); 2181 _max_size = MAX2(_max_size, argsize); 2182 } 2183 2184 void print_histogram_helper(int n, int* histo, const char* name) { 2185 const int N = MIN2(5, n); 2186 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 2187 double sum = 0; 2188 double weighted_sum = 0; 2189 int i; 2190 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; } 2191 double rest = sum; 2192 double percent = sum / 100; 2193 for (i = 0; i <= N; i++) { 2194 rest -= histo[i]; 2195 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent); 2196 } 2197 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent); 2198 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n); 2199 } 2200 2201 void print_histogram() { 2202 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 2203 print_histogram_helper(_max_arity, _arity_histogram, "arity"); 2204 tty->print_cr("\nSame for parameter size (in words):"); 2205 print_histogram_helper(_max_size, _size_histogram, "size"); 2206 tty->cr(); 2207 } 2208 2209 public: 2210 MethodArityHistogram() { 2211 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2212 _max_arity = _max_size = 0; 2213 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0; 2214 CodeCache::nmethods_do(add_method_to_histogram); 2215 print_histogram(); 2216 } 2217 }; 2218 2219 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY]; 2220 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY]; 2221 int MethodArityHistogram::_max_arity; 2222 int MethodArityHistogram::_max_size; 2223 2224 void SharedRuntime::print_call_statistics(int comp_total) { 2225 tty->print_cr("Calls from compiled code:"); 2226 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls; 2227 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls; 2228 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls; 2229 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total)); 2230 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total)); 2231 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls)); 2232 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls)); 2233 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls)); 2234 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls)); 2235 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total)); 2236 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls)); 2237 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls)); 2238 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls)); 2239 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls)); 2240 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total)); 2241 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls)); 2242 tty->cr(); 2243 tty->print_cr("Note 1: counter updates are not MT-safe."); 2244 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;"); 2245 tty->print_cr(" %% in nested categories are relative to their category"); 2246 tty->print_cr(" (and thus add up to more than 100%% with inlining)"); 2247 tty->cr(); 2248 2249 MethodArityHistogram h; 2250 } 2251 #endif 2252 2253 2254 // A simple wrapper class around the calling convention information 2255 // that allows sharing of adapters for the same calling convention. 2256 class AdapterFingerPrint : public CHeapObj<mtCode> { 2257 private: 2258 enum { 2259 _basic_type_bits = 4, 2260 _basic_type_mask = right_n_bits(_basic_type_bits), 2261 _basic_types_per_int = BitsPerInt / _basic_type_bits, 2262 _compact_int_count = 3 2263 }; 2264 // TO DO: Consider integrating this with a more global scheme for compressing signatures. 2265 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive. 2266 2267 union { 2268 int _compact[_compact_int_count]; 2269 int* _fingerprint; 2270 } _value; 2271 int _length; // A negative length indicates the fingerprint is in the compact form, 2272 // Otherwise _value._fingerprint is the array. 2273 2274 // Remap BasicTypes that are handled equivalently by the adapters. 2275 // These are correct for the current system but someday it might be 2276 // necessary to make this mapping platform dependent. 2277 static int adapter_encoding(BasicType in) { 2278 switch (in) { 2279 case T_BOOLEAN: 2280 case T_BYTE: 2281 case T_SHORT: 2282 case T_CHAR: 2283 // There are all promoted to T_INT in the calling convention 2284 return T_INT; 2285 2286 case T_OBJECT: 2287 case T_ARRAY: 2288 // In other words, we assume that any register good enough for 2289 // an int or long is good enough for a managed pointer. 2290 #ifdef _LP64 2291 return T_LONG; 2292 #else 2293 return T_INT; 2294 #endif 2295 2296 case T_INT: 2297 case T_LONG: 2298 case T_FLOAT: 2299 case T_DOUBLE: 2300 case T_VOID: 2301 return in; 2302 2303 default: 2304 ShouldNotReachHere(); 2305 return T_CONFLICT; 2306 } 2307 } 2308 2309 public: 2310 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) { 2311 // The fingerprint is based on the BasicType signature encoded 2312 // into an array of ints with eight entries per int. 2313 int* ptr; 2314 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int; 2315 if (len <= _compact_int_count) { 2316 assert(_compact_int_count == 3, "else change next line"); 2317 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0; 2318 // Storing the signature encoded as signed chars hits about 98% 2319 // of the time. 2320 _length = -len; 2321 ptr = _value._compact; 2322 } else { 2323 _length = len; 2324 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode); 2325 ptr = _value._fingerprint; 2326 } 2327 2328 // Now pack the BasicTypes with 8 per int 2329 int sig_index = 0; 2330 for (int index = 0; index < len; index++) { 2331 int value = 0; 2332 for (int byte = 0; byte < _basic_types_per_int; byte++) { 2333 int bt = ((sig_index < total_args_passed) 2334 ? adapter_encoding(sig_bt[sig_index++]) 2335 : 0); 2336 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits"); 2337 value = (value << _basic_type_bits) | bt; 2338 } 2339 ptr[index] = value; 2340 } 2341 } 2342 2343 ~AdapterFingerPrint() { 2344 if (_length > 0) { 2345 FREE_C_HEAP_ARRAY(int, _value._fingerprint); 2346 } 2347 } 2348 2349 int value(int index) { 2350 if (_length < 0) { 2351 return _value._compact[index]; 2352 } 2353 return _value._fingerprint[index]; 2354 } 2355 int length() { 2356 if (_length < 0) return -_length; 2357 return _length; 2358 } 2359 2360 bool is_compact() { 2361 return _length <= 0; 2362 } 2363 2364 unsigned int compute_hash() { 2365 int hash = 0; 2366 for (int i = 0; i < length(); i++) { 2367 int v = value(i); 2368 hash = (hash << 8) ^ v ^ (hash >> 5); 2369 } 2370 return (unsigned int)hash; 2371 } 2372 2373 const char* as_string() { 2374 stringStream st; 2375 st.print("0x"); 2376 for (int i = 0; i < length(); i++) { 2377 st.print("%08x", value(i)); 2378 } 2379 return st.as_string(); 2380 } 2381 2382 bool equals(AdapterFingerPrint* other) { 2383 if (other->_length != _length) { 2384 return false; 2385 } 2386 if (_length < 0) { 2387 assert(_compact_int_count == 3, "else change next line"); 2388 return _value._compact[0] == other->_value._compact[0] && 2389 _value._compact[1] == other->_value._compact[1] && 2390 _value._compact[2] == other->_value._compact[2]; 2391 } else { 2392 for (int i = 0; i < _length; i++) { 2393 if (_value._fingerprint[i] != other->_value._fingerprint[i]) { 2394 return false; 2395 } 2396 } 2397 } 2398 return true; 2399 } 2400 }; 2401 2402 2403 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries 2404 class AdapterHandlerTable : public BasicHashtable<mtCode> { 2405 friend class AdapterHandlerTableIterator; 2406 2407 private: 2408 2409 #ifndef PRODUCT 2410 static int _lookups; // number of calls to lookup 2411 static int _buckets; // number of buckets checked 2412 static int _equals; // number of buckets checked with matching hash 2413 static int _hits; // number of successful lookups 2414 static int _compact; // number of equals calls with compact signature 2415 #endif 2416 2417 AdapterHandlerEntry* bucket(int i) { 2418 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i); 2419 } 2420 2421 public: 2422 AdapterHandlerTable() 2423 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { } 2424 2425 // Create a new entry suitable for insertion in the table 2426 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 2427 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash()); 2428 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2429 if (DumpSharedSpaces) { 2430 ((CDSAdapterHandlerEntry*)entry)->init(); 2431 } 2432 return entry; 2433 } 2434 2435 // Insert an entry into the table 2436 void add(AdapterHandlerEntry* entry) { 2437 int index = hash_to_index(entry->hash()); 2438 add_entry(index, entry); 2439 } 2440 2441 void free_entry(AdapterHandlerEntry* entry) { 2442 entry->deallocate(); 2443 BasicHashtable<mtCode>::free_entry(entry); 2444 } 2445 2446 // Find a entry with the same fingerprint if it exists 2447 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) { 2448 NOT_PRODUCT(_lookups++); 2449 AdapterFingerPrint fp(total_args_passed, sig_bt); 2450 unsigned int hash = fp.compute_hash(); 2451 int index = hash_to_index(hash); 2452 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2453 NOT_PRODUCT(_buckets++); 2454 if (e->hash() == hash) { 2455 NOT_PRODUCT(_equals++); 2456 if (fp.equals(e->fingerprint())) { 2457 #ifndef PRODUCT 2458 if (fp.is_compact()) _compact++; 2459 _hits++; 2460 #endif 2461 return e; 2462 } 2463 } 2464 } 2465 return NULL; 2466 } 2467 2468 #ifndef PRODUCT 2469 void print_statistics() { 2470 ResourceMark rm; 2471 int longest = 0; 2472 int empty = 0; 2473 int total = 0; 2474 int nonempty = 0; 2475 for (int index = 0; index < table_size(); index++) { 2476 int count = 0; 2477 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2478 count++; 2479 } 2480 if (count != 0) nonempty++; 2481 if (count == 0) empty++; 2482 if (count > longest) longest = count; 2483 total += count; 2484 } 2485 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f", 2486 empty, longest, total, total / (double)nonempty); 2487 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d", 2488 _lookups, _buckets, _equals, _hits, _compact); 2489 } 2490 #endif 2491 }; 2492 2493 2494 #ifndef PRODUCT 2495 2496 int AdapterHandlerTable::_lookups; 2497 int AdapterHandlerTable::_buckets; 2498 int AdapterHandlerTable::_equals; 2499 int AdapterHandlerTable::_hits; 2500 int AdapterHandlerTable::_compact; 2501 2502 #endif 2503 2504 class AdapterHandlerTableIterator : public StackObj { 2505 private: 2506 AdapterHandlerTable* _table; 2507 int _index; 2508 AdapterHandlerEntry* _current; 2509 2510 void scan() { 2511 while (_index < _table->table_size()) { 2512 AdapterHandlerEntry* a = _table->bucket(_index); 2513 _index++; 2514 if (a != NULL) { 2515 _current = a; 2516 return; 2517 } 2518 } 2519 } 2520 2521 public: 2522 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) { 2523 scan(); 2524 } 2525 bool has_next() { 2526 return _current != NULL; 2527 } 2528 AdapterHandlerEntry* next() { 2529 if (_current != NULL) { 2530 AdapterHandlerEntry* result = _current; 2531 _current = _current->next(); 2532 if (_current == NULL) scan(); 2533 return result; 2534 } else { 2535 return NULL; 2536 } 2537 } 2538 }; 2539 2540 2541 // --------------------------------------------------------------------------- 2542 // Implementation of AdapterHandlerLibrary 2543 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL; 2544 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL; 2545 const int AdapterHandlerLibrary_size = 16*K; 2546 BufferBlob* AdapterHandlerLibrary::_buffer = NULL; 2547 2548 BufferBlob* AdapterHandlerLibrary::buffer_blob() { 2549 // Should be called only when AdapterHandlerLibrary_lock is active. 2550 if (_buffer == NULL) // Initialize lazily 2551 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size); 2552 return _buffer; 2553 } 2554 2555 extern "C" void unexpected_adapter_call() { 2556 ShouldNotCallThis(); 2557 } 2558 2559 void AdapterHandlerLibrary::initialize() { 2560 if (_adapters != NULL) return; 2561 _adapters = new AdapterHandlerTable(); 2562 2563 // Create a special handler for abstract methods. Abstract methods 2564 // are never compiled so an i2c entry is somewhat meaningless, but 2565 // throw AbstractMethodError just in case. 2566 // Pass wrong_method_abstract for the c2i transitions to return 2567 // AbstractMethodError for invalid invocations. 2568 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub(); 2569 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL), 2570 StubRoutines::throw_AbstractMethodError_entry(), 2571 wrong_method_abstract, wrong_method_abstract); 2572 } 2573 2574 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint, 2575 address i2c_entry, 2576 address c2i_entry, 2577 address c2i_unverified_entry) { 2578 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2579 } 2580 2581 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) { 2582 AdapterHandlerEntry* entry = get_adapter0(method); 2583 if (method->is_shared()) { 2584 // See comments around Method::link_method() 2585 MutexLocker mu(AdapterHandlerLibrary_lock); 2586 if (method->adapter() == NULL) { 2587 method->update_adapter_trampoline(entry); 2588 } 2589 address trampoline = method->from_compiled_entry(); 2590 if (*(int*)trampoline == 0) { 2591 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size()); 2592 MacroAssembler _masm(&buffer); 2593 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry()); 2594 assert(*(int*)trampoline != 0, "Instruction(s) for trampoline must not be encoded as zeros."); 2595 2596 if (PrintInterpreter) { 2597 Disassembler::decode(buffer.insts_begin(), buffer.insts_end()); 2598 } 2599 } 2600 } 2601 2602 return entry; 2603 } 2604 2605 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) { 2606 // Use customized signature handler. Need to lock around updates to 2607 // the AdapterHandlerTable (it is not safe for concurrent readers 2608 // and a single writer: this could be fixed if it becomes a 2609 // problem). 2610 2611 ResourceMark rm; 2612 2613 NOT_PRODUCT(int insts_size); 2614 AdapterBlob* new_adapter = NULL; 2615 AdapterHandlerEntry* entry = NULL; 2616 AdapterFingerPrint* fingerprint = NULL; 2617 { 2618 MutexLocker mu(AdapterHandlerLibrary_lock); 2619 // make sure data structure is initialized 2620 initialize(); 2621 2622 if (method->is_abstract()) { 2623 return _abstract_method_handler; 2624 } 2625 2626 // Fill in the signature array, for the calling-convention call. 2627 int total_args_passed = method->size_of_parameters(); // All args on stack 2628 2629 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2630 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2631 int i = 0; 2632 if (!method->is_static()) // Pass in receiver first 2633 sig_bt[i++] = T_OBJECT; 2634 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) { 2635 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2636 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2637 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2638 } 2639 assert(i == total_args_passed, ""); 2640 2641 // Lookup method signature's fingerprint 2642 entry = _adapters->lookup(total_args_passed, sig_bt); 2643 2644 #ifdef ASSERT 2645 AdapterHandlerEntry* shared_entry = NULL; 2646 // Start adapter sharing verification only after the VM is booted. 2647 if (VerifyAdapterSharing && (entry != NULL)) { 2648 shared_entry = entry; 2649 entry = NULL; 2650 } 2651 #endif 2652 2653 if (entry != NULL) { 2654 return entry; 2655 } 2656 2657 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage 2658 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); 2659 2660 // Make a C heap allocated version of the fingerprint to store in the adapter 2661 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt); 2662 2663 // StubRoutines::code2() is initialized after this function can be called. As a result, 2664 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated 2665 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C 2666 // stub that ensure that an I2C stub is called from an interpreter frame. 2667 bool contains_all_checks = StubRoutines::code2() != NULL; 2668 2669 // Create I2C & C2I handlers 2670 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2671 if (buf != NULL) { 2672 CodeBuffer buffer(buf); 2673 short buffer_locs[20]; 2674 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs, 2675 sizeof(buffer_locs)/sizeof(relocInfo)); 2676 2677 MacroAssembler _masm(&buffer); 2678 entry = SharedRuntime::generate_i2c2i_adapters(&_masm, 2679 total_args_passed, 2680 comp_args_on_stack, 2681 sig_bt, 2682 regs, 2683 fingerprint); 2684 #ifdef ASSERT 2685 if (VerifyAdapterSharing) { 2686 if (shared_entry != NULL) { 2687 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match"); 2688 // Release the one just created and return the original 2689 _adapters->free_entry(entry); 2690 return shared_entry; 2691 } else { 2692 entry->save_code(buf->code_begin(), buffer.insts_size()); 2693 } 2694 } 2695 #endif 2696 2697 new_adapter = AdapterBlob::create(&buffer); 2698 NOT_PRODUCT(insts_size = buffer.insts_size()); 2699 } 2700 if (new_adapter == NULL) { 2701 // CodeCache is full, disable compilation 2702 // Ought to log this but compile log is only per compile thread 2703 // and we're some non descript Java thread. 2704 return NULL; // Out of CodeCache space 2705 } 2706 entry->relocate(new_adapter->content_begin()); 2707 #ifndef PRODUCT 2708 // debugging suppport 2709 if (PrintAdapterHandlers || PrintStubCode) { 2710 ttyLocker ttyl; 2711 entry->print_adapter_on(tty); 2712 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)", 2713 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"), 2714 method->signature()->as_C_string(), fingerprint->as_string(), insts_size); 2715 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry()); 2716 if (Verbose || PrintStubCode) { 2717 address first_pc = entry->base_address(); 2718 if (first_pc != NULL) { 2719 Disassembler::decode(first_pc, first_pc + insts_size); 2720 tty->cr(); 2721 } 2722 } 2723 } 2724 #endif 2725 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp) 2726 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified. 2727 if (contains_all_checks || !VerifyAdapterCalls) { 2728 _adapters->add(entry); 2729 } 2730 } 2731 // Outside of the lock 2732 if (new_adapter != NULL) { 2733 char blob_id[256]; 2734 jio_snprintf(blob_id, 2735 sizeof(blob_id), 2736 "%s(%s)@" PTR_FORMAT, 2737 new_adapter->name(), 2738 fingerprint->as_string(), 2739 new_adapter->content_begin()); 2740 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end()); 2741 2742 if (JvmtiExport::should_post_dynamic_code_generated()) { 2743 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end()); 2744 } 2745 } 2746 return entry; 2747 } 2748 2749 address AdapterHandlerEntry::base_address() { 2750 address base = _i2c_entry; 2751 if (base == NULL) base = _c2i_entry; 2752 assert(base <= _c2i_entry || _c2i_entry == NULL, ""); 2753 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, ""); 2754 return base; 2755 } 2756 2757 void AdapterHandlerEntry::relocate(address new_base) { 2758 address old_base = base_address(); 2759 assert(old_base != NULL, ""); 2760 ptrdiff_t delta = new_base - old_base; 2761 if (_i2c_entry != NULL) 2762 _i2c_entry += delta; 2763 if (_c2i_entry != NULL) 2764 _c2i_entry += delta; 2765 if (_c2i_unverified_entry != NULL) 2766 _c2i_unverified_entry += delta; 2767 assert(base_address() == new_base, ""); 2768 } 2769 2770 2771 void AdapterHandlerEntry::deallocate() { 2772 delete _fingerprint; 2773 #ifdef ASSERT 2774 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code); 2775 #endif 2776 } 2777 2778 2779 #ifdef ASSERT 2780 // Capture the code before relocation so that it can be compared 2781 // against other versions. If the code is captured after relocation 2782 // then relative instructions won't be equivalent. 2783 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) { 2784 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode); 2785 _saved_code_length = length; 2786 memcpy(_saved_code, buffer, length); 2787 } 2788 2789 2790 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) { 2791 if (length != _saved_code_length) { 2792 return false; 2793 } 2794 2795 return (memcmp(buffer, _saved_code, length) == 0) ? true : false; 2796 } 2797 #endif 2798 2799 2800 /** 2801 * Create a native wrapper for this native method. The wrapper converts the 2802 * Java-compiled calling convention to the native convention, handles 2803 * arguments, and transitions to native. On return from the native we transition 2804 * back to java blocking if a safepoint is in progress. 2805 */ 2806 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) { 2807 ResourceMark rm; 2808 nmethod* nm = NULL; 2809 2810 assert(method->is_native(), "must be native"); 2811 assert(method->is_method_handle_intrinsic() || 2812 method->has_native_function(), "must have something valid to call!"); 2813 2814 { 2815 // Perform the work while holding the lock, but perform any printing outside the lock 2816 MutexLocker mu(AdapterHandlerLibrary_lock); 2817 // See if somebody beat us to it 2818 if (method->code() != NULL) { 2819 return; 2820 } 2821 2822 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci); 2823 assert(compile_id > 0, "Must generate native wrapper"); 2824 2825 2826 ResourceMark rm; 2827 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2828 if (buf != NULL) { 2829 CodeBuffer buffer(buf); 2830 double locs_buf[20]; 2831 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); 2832 MacroAssembler _masm(&buffer); 2833 2834 // Fill in the signature array, for the calling-convention call. 2835 const int total_args_passed = method->size_of_parameters(); 2836 2837 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2838 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2839 int i=0; 2840 if (!method->is_static()) // Pass in receiver first 2841 sig_bt[i++] = T_OBJECT; 2842 SignatureStream ss(method->signature()); 2843 for (; !ss.at_return_type(); ss.next()) { 2844 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2845 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2846 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2847 } 2848 assert(i == total_args_passed, ""); 2849 BasicType ret_type = ss.type(); 2850 2851 // Now get the compiled-Java layout as input (or output) arguments. 2852 // NOTE: Stubs for compiled entry points of method handle intrinsics 2853 // are just trampolines so the argument registers must be outgoing ones. 2854 const bool is_outgoing = method->is_method_handle_intrinsic(); 2855 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing); 2856 2857 // Generate the compiled-to-native wrapper code 2858 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type); 2859 2860 if (nm != NULL) { 2861 method->set_code(method, nm); 2862 2863 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple)); 2864 if (directive->PrintAssemblyOption) { 2865 nm->print_code(); 2866 } 2867 DirectivesStack::release(directive); 2868 } 2869 } 2870 } // Unlock AdapterHandlerLibrary_lock 2871 2872 2873 // Install the generated code. 2874 if (nm != NULL) { 2875 const char *msg = method->is_static() ? "(static)" : ""; 2876 CompileTask::print_ul(nm, msg); 2877 if (PrintCompilation) { 2878 ttyLocker ttyl; 2879 CompileTask::print(tty, nm, msg); 2880 } 2881 nm->post_compiled_method_load_event(); 2882 } 2883 } 2884 2885 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread)) 2886 assert(thread == JavaThread::current(), "must be"); 2887 // The code is about to enter a JNI lazy critical native method and 2888 // _needs_gc is true, so if this thread is already in a critical 2889 // section then just return, otherwise this thread should block 2890 // until needs_gc has been cleared. 2891 if (thread->in_critical()) { 2892 return; 2893 } 2894 // Lock and unlock a critical section to give the system a chance to block 2895 GCLocker::lock_critical(thread); 2896 GCLocker::unlock_critical(thread); 2897 JRT_END 2898 2899 // ------------------------------------------------------------------------- 2900 // Java-Java calling convention 2901 // (what you use when Java calls Java) 2902 2903 //------------------------------name_for_receiver---------------------------------- 2904 // For a given signature, return the VMReg for parameter 0. 2905 VMReg SharedRuntime::name_for_receiver() { 2906 VMRegPair regs; 2907 BasicType sig_bt = T_OBJECT; 2908 (void) java_calling_convention(&sig_bt, ®s, 1, true); 2909 // Return argument 0 register. In the LP64 build pointers 2910 // take 2 registers, but the VM wants only the 'main' name. 2911 return regs.first(); 2912 } 2913 2914 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) { 2915 // This method is returning a data structure allocating as a 2916 // ResourceObject, so do not put any ResourceMarks in here. 2917 char *s = sig->as_C_string(); 2918 int len = (int)strlen(s); 2919 s++; len--; // Skip opening paren 2920 2921 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256); 2922 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256); 2923 int cnt = 0; 2924 if (has_receiver) { 2925 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature 2926 } 2927 2928 while (*s != ')') { // Find closing right paren 2929 switch (*s++) { // Switch on signature character 2930 case 'B': sig_bt[cnt++] = T_BYTE; break; 2931 case 'C': sig_bt[cnt++] = T_CHAR; break; 2932 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break; 2933 case 'F': sig_bt[cnt++] = T_FLOAT; break; 2934 case 'I': sig_bt[cnt++] = T_INT; break; 2935 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break; 2936 case 'S': sig_bt[cnt++] = T_SHORT; break; 2937 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break; 2938 case 'V': sig_bt[cnt++] = T_VOID; break; 2939 case 'L': // Oop 2940 while (*s++ != ';'); // Skip signature 2941 sig_bt[cnt++] = T_OBJECT; 2942 break; 2943 case '[': { // Array 2944 do { // Skip optional size 2945 while (*s >= '0' && *s <= '9') s++; 2946 } while (*s++ == '['); // Nested arrays? 2947 // Skip element type 2948 if (s[-1] == 'L') 2949 while (*s++ != ';'); // Skip signature 2950 sig_bt[cnt++] = T_ARRAY; 2951 break; 2952 } 2953 default : ShouldNotReachHere(); 2954 } 2955 } 2956 2957 if (has_appendix) { 2958 sig_bt[cnt++] = T_OBJECT; 2959 } 2960 2961 assert(cnt < 256, "grow table size"); 2962 2963 int comp_args_on_stack; 2964 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true); 2965 2966 // the calling convention doesn't count out_preserve_stack_slots so 2967 // we must add that in to get "true" stack offsets. 2968 2969 if (comp_args_on_stack) { 2970 for (int i = 0; i < cnt; i++) { 2971 VMReg reg1 = regs[i].first(); 2972 if (reg1->is_stack()) { 2973 // Yuck 2974 reg1 = reg1->bias(out_preserve_stack_slots()); 2975 } 2976 VMReg reg2 = regs[i].second(); 2977 if (reg2->is_stack()) { 2978 // Yuck 2979 reg2 = reg2->bias(out_preserve_stack_slots()); 2980 } 2981 regs[i].set_pair(reg2, reg1); 2982 } 2983 } 2984 2985 // results 2986 *arg_size = cnt; 2987 return regs; 2988 } 2989 2990 // OSR Migration Code 2991 // 2992 // This code is used convert interpreter frames into compiled frames. It is 2993 // called from very start of a compiled OSR nmethod. A temp array is 2994 // allocated to hold the interesting bits of the interpreter frame. All 2995 // active locks are inflated to allow them to move. The displaced headers and 2996 // active interpreter locals are copied into the temp buffer. Then we return 2997 // back to the compiled code. The compiled code then pops the current 2998 // interpreter frame off the stack and pushes a new compiled frame. Then it 2999 // copies the interpreter locals and displaced headers where it wants. 3000 // Finally it calls back to free the temp buffer. 3001 // 3002 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed. 3003 3004 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) ) 3005 3006 // 3007 // This code is dependent on the memory layout of the interpreter local 3008 // array and the monitors. On all of our platforms the layout is identical 3009 // so this code is shared. If some platform lays the their arrays out 3010 // differently then this code could move to platform specific code or 3011 // the code here could be modified to copy items one at a time using 3012 // frame accessor methods and be platform independent. 3013 3014 frame fr = thread->last_frame(); 3015 assert(fr.is_interpreted_frame(), ""); 3016 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks"); 3017 3018 // Figure out how many monitors are active. 3019 int active_monitor_count = 0; 3020 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 3021 kptr < fr.interpreter_frame_monitor_begin(); 3022 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 3023 if (kptr->obj() != NULL) active_monitor_count++; 3024 } 3025 3026 // QQQ we could place number of active monitors in the array so that compiled code 3027 // could double check it. 3028 3029 Method* moop = fr.interpreter_frame_method(); 3030 int max_locals = moop->max_locals(); 3031 // Allocate temp buffer, 1 word per local & 2 per active monitor 3032 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size(); 3033 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode); 3034 3035 // Copy the locals. Order is preserved so that loading of longs works. 3036 // Since there's no GC I can copy the oops blindly. 3037 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code"); 3038 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1), 3039 (HeapWord*)&buf[0], 3040 max_locals); 3041 3042 // Inflate locks. Copy the displaced headers. Be careful, there can be holes. 3043 int i = max_locals; 3044 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end(); 3045 kptr2 < fr.interpreter_frame_monitor_begin(); 3046 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) { 3047 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array 3048 BasicLock *lock = kptr2->lock(); 3049 // Inflate so the displaced header becomes position-independent 3050 if (lock->displaced_header()->is_unlocked()) 3051 ObjectSynchronizer::inflate_helper(kptr2->obj()); 3052 // Now the displaced header is free to move 3053 buf[i++] = (intptr_t)lock->displaced_header(); 3054 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj()); 3055 } 3056 } 3057 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors"); 3058 3059 return buf; 3060 JRT_END 3061 3062 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) ) 3063 FREE_C_HEAP_ARRAY(intptr_t, buf); 3064 JRT_END 3065 3066 bool AdapterHandlerLibrary::contains(const CodeBlob* b) { 3067 AdapterHandlerTableIterator iter(_adapters); 3068 while (iter.has_next()) { 3069 AdapterHandlerEntry* a = iter.next(); 3070 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true; 3071 } 3072 return false; 3073 } 3074 3075 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) { 3076 AdapterHandlerTableIterator iter(_adapters); 3077 while (iter.has_next()) { 3078 AdapterHandlerEntry* a = iter.next(); 3079 if (b == CodeCache::find_blob(a->get_i2c_entry())) { 3080 st->print("Adapter for signature: "); 3081 a->print_adapter_on(tty); 3082 return; 3083 } 3084 } 3085 assert(false, "Should have found handler"); 3086 } 3087 3088 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const { 3089 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT, 3090 p2i(this), fingerprint()->as_string(), 3091 p2i(get_i2c_entry()), p2i(get_c2i_entry()), p2i(get_c2i_unverified_entry())); 3092 3093 } 3094 3095 #if INCLUDE_CDS 3096 3097 void CDSAdapterHandlerEntry::init() { 3098 assert(DumpSharedSpaces, "used during dump time only"); 3099 _c2i_entry_trampoline = (address)MetaspaceShared::misc_code_space_alloc(SharedRuntime::trampoline_size()); 3100 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_code_space_alloc(sizeof(AdapterHandlerEntry*)); 3101 }; 3102 3103 #endif // INCLUDE_CDS 3104 3105 3106 #ifndef PRODUCT 3107 3108 void AdapterHandlerLibrary::print_statistics() { 3109 _adapters->print_statistics(); 3110 } 3111 3112 #endif /* PRODUCT */ 3113 3114 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread)) 3115 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone"); 3116 if (thread->stack_reserved_zone_disabled()) { 3117 thread->enable_stack_reserved_zone(); 3118 } 3119 thread->set_reserved_stack_activation(thread->stack_base()); 3120 JRT_END 3121 3122 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) { 3123 ResourceMark rm(thread); 3124 frame activation; 3125 CompiledMethod* nm = NULL; 3126 int count = 1; 3127 3128 assert(fr.is_java_frame(), "Must start on Java frame"); 3129 3130 while (true) { 3131 Method* method = NULL; 3132 bool found = false; 3133 if (fr.is_interpreted_frame()) { 3134 method = fr.interpreter_frame_method(); 3135 if (method != NULL && method->has_reserved_stack_access()) { 3136 found = true; 3137 } 3138 } else { 3139 CodeBlob* cb = fr.cb(); 3140 if (cb != NULL && cb->is_compiled()) { 3141 nm = cb->as_compiled_method(); 3142 method = nm->method(); 3143 // scope_desc_near() must be used, instead of scope_desc_at() because on 3144 // SPARC, the pcDesc can be on the delay slot after the call instruction. 3145 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != NULL; sd = sd->sender()) { 3146 method = sd->method(); 3147 if (method != NULL && method->has_reserved_stack_access()) { 3148 found = true; 3149 } 3150 } 3151 } 3152 } 3153 if (found) { 3154 activation = fr; 3155 warning("Potentially dangerous stack overflow in " 3156 "ReservedStackAccess annotated method %s [%d]", 3157 method->name_and_sig_as_C_string(), count++); 3158 EventReservedStackActivation event; 3159 if (event.should_commit()) { 3160 event.set_method(method); 3161 event.commit(); 3162 } 3163 } 3164 if (fr.is_first_java_frame()) { 3165 break; 3166 } else { 3167 fr = fr.java_sender(); 3168 } 3169 } 3170 return activation; 3171 }