1 /* 2 * Copyright (c) 1997, 2012, 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 "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/scopeDesc.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/abstractCompiler.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/compilerOracle.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "interpreter/interpreterRuntime.hpp" 36 #include "memory/gcLocker.inline.hpp" 37 #include "memory/universe.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "prims/forte.hpp" 40 #include "prims/jvmtiExport.hpp" 41 #include "prims/jvmtiRedefineClassesTrace.hpp" 42 #include "prims/methodHandles.hpp" 43 #include "prims/nativeLookup.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/biasedLocking.hpp" 46 #include "runtime/handles.inline.hpp" 47 #include "runtime/init.hpp" 48 #include "runtime/interfaceSupport.hpp" 49 #include "runtime/javaCalls.hpp" 50 #include "runtime/sharedRuntime.hpp" 51 #include "runtime/stubRoutines.hpp" 52 #include "runtime/vframe.hpp" 53 #include "runtime/vframeArray.hpp" 54 #include "utilities/copy.hpp" 55 #include "utilities/dtrace.hpp" 56 #include "utilities/events.hpp" 57 #include "utilities/hashtable.inline.hpp" 58 #include "utilities/xmlstream.hpp" 59 #ifdef TARGET_ARCH_x86 60 # include "nativeInst_x86.hpp" 61 # include "vmreg_x86.inline.hpp" 62 #endif 63 #ifdef TARGET_ARCH_sparc 64 # include "nativeInst_sparc.hpp" 65 # include "vmreg_sparc.inline.hpp" 66 #endif 67 #ifdef TARGET_ARCH_zero 68 # include "nativeInst_zero.hpp" 69 # include "vmreg_zero.inline.hpp" 70 #endif 71 #ifdef TARGET_ARCH_arm 72 # include "nativeInst_arm.hpp" 73 # include "vmreg_arm.inline.hpp" 74 #endif 75 #ifdef TARGET_ARCH_ppc 76 # include "nativeInst_ppc.hpp" 77 # include "vmreg_ppc.inline.hpp" 78 #endif 79 #ifdef COMPILER1 80 #include "c1/c1_Runtime1.hpp" 81 #endif 82 83 // Shared stub locations 84 RuntimeStub* SharedRuntime::_wrong_method_blob; 85 RuntimeStub* SharedRuntime::_ic_miss_blob; 86 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob; 87 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob; 88 RuntimeStub* SharedRuntime::_resolve_static_call_blob; 89 90 DeoptimizationBlob* SharedRuntime::_deopt_blob; 91 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob; 92 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob; 93 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob; 94 95 #ifdef COMPILER2 96 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob; 97 #endif // COMPILER2 98 99 100 //----------------------------generate_stubs----------------------------------- 101 void SharedRuntime::generate_stubs() { 102 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub"); 103 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub"); 104 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call"); 105 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call"); 106 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call"); 107 108 #ifdef COMPILER2 109 // Vectors are generated only by C2. 110 if (is_wide_vector(MaxVectorSize)) { 111 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP); 112 } 113 #endif // COMPILER2 114 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP); 115 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN); 116 117 generate_deopt_blob(); 118 119 #ifdef COMPILER2 120 generate_uncommon_trap_blob(); 121 #endif // COMPILER2 122 } 123 124 #include <math.h> 125 126 #ifndef USDT2 127 HS_DTRACE_PROBE_DECL4(hotspot, object__alloc, Thread*, char*, int, size_t); 128 HS_DTRACE_PROBE_DECL7(hotspot, method__entry, int, 129 char*, int, char*, int, char*, int); 130 HS_DTRACE_PROBE_DECL7(hotspot, method__return, int, 131 char*, int, char*, int, char*, int); 132 #endif /* !USDT2 */ 133 134 // Implementation of SharedRuntime 135 136 #ifndef PRODUCT 137 // For statistics 138 int SharedRuntime::_ic_miss_ctr = 0; 139 int SharedRuntime::_wrong_method_ctr = 0; 140 int SharedRuntime::_resolve_static_ctr = 0; 141 int SharedRuntime::_resolve_virtual_ctr = 0; 142 int SharedRuntime::_resolve_opt_virtual_ctr = 0; 143 int SharedRuntime::_implicit_null_throws = 0; 144 int SharedRuntime::_implicit_div0_throws = 0; 145 int SharedRuntime::_throw_null_ctr = 0; 146 147 int SharedRuntime::_nof_normal_calls = 0; 148 int SharedRuntime::_nof_optimized_calls = 0; 149 int SharedRuntime::_nof_inlined_calls = 0; 150 int SharedRuntime::_nof_megamorphic_calls = 0; 151 int SharedRuntime::_nof_static_calls = 0; 152 int SharedRuntime::_nof_inlined_static_calls = 0; 153 int SharedRuntime::_nof_interface_calls = 0; 154 int SharedRuntime::_nof_optimized_interface_calls = 0; 155 int SharedRuntime::_nof_inlined_interface_calls = 0; 156 int SharedRuntime::_nof_megamorphic_interface_calls = 0; 157 int SharedRuntime::_nof_removable_exceptions = 0; 158 159 int SharedRuntime::_new_instance_ctr=0; 160 int SharedRuntime::_new_array_ctr=0; 161 int SharedRuntime::_multi1_ctr=0; 162 int SharedRuntime::_multi2_ctr=0; 163 int SharedRuntime::_multi3_ctr=0; 164 int SharedRuntime::_multi4_ctr=0; 165 int SharedRuntime::_multi5_ctr=0; 166 int SharedRuntime::_mon_enter_stub_ctr=0; 167 int SharedRuntime::_mon_exit_stub_ctr=0; 168 int SharedRuntime::_mon_enter_ctr=0; 169 int SharedRuntime::_mon_exit_ctr=0; 170 int SharedRuntime::_partial_subtype_ctr=0; 171 int SharedRuntime::_jbyte_array_copy_ctr=0; 172 int SharedRuntime::_jshort_array_copy_ctr=0; 173 int SharedRuntime::_jint_array_copy_ctr=0; 174 int SharedRuntime::_jlong_array_copy_ctr=0; 175 int SharedRuntime::_oop_array_copy_ctr=0; 176 int SharedRuntime::_checkcast_array_copy_ctr=0; 177 int SharedRuntime::_unsafe_array_copy_ctr=0; 178 int SharedRuntime::_generic_array_copy_ctr=0; 179 int SharedRuntime::_slow_array_copy_ctr=0; 180 int SharedRuntime::_find_handler_ctr=0; 181 int SharedRuntime::_rethrow_ctr=0; 182 183 int SharedRuntime::_ICmiss_index = 0; 184 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count]; 185 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count]; 186 187 188 void SharedRuntime::trace_ic_miss(address at) { 189 for (int i = 0; i < _ICmiss_index; i++) { 190 if (_ICmiss_at[i] == at) { 191 _ICmiss_count[i]++; 192 return; 193 } 194 } 195 int index = _ICmiss_index++; 196 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1; 197 _ICmiss_at[index] = at; 198 _ICmiss_count[index] = 1; 199 } 200 201 void SharedRuntime::print_ic_miss_histogram() { 202 if (ICMissHistogram) { 203 tty->print_cr ("IC Miss Histogram:"); 204 int tot_misses = 0; 205 for (int i = 0; i < _ICmiss_index; i++) { 206 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", _ICmiss_at[i], _ICmiss_count[i]); 207 tot_misses += _ICmiss_count[i]; 208 } 209 tty->print_cr ("Total IC misses: %7d", tot_misses); 210 } 211 } 212 #endif // PRODUCT 213 214 #ifndef SERIALGC 215 216 // G1 write-barrier pre: executed before a pointer store. 217 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread)) 218 if (orig == NULL) { 219 assert(false, "should be optimized out"); 220 return; 221 } 222 assert(orig->is_oop(true /* ignore mark word */), "Error"); 223 // store the original value that was in the field reference 224 thread->satb_mark_queue().enqueue(orig); 225 JRT_END 226 227 // G1 write-barrier post: executed after a pointer store. 228 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread)) 229 thread->dirty_card_queue().enqueue(card_addr); 230 JRT_END 231 232 #endif // !SERIALGC 233 234 235 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x)) 236 return x * y; 237 JRT_END 238 239 240 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x)) 241 if (x == min_jlong && y == CONST64(-1)) { 242 return x; 243 } else { 244 return x / y; 245 } 246 JRT_END 247 248 249 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x)) 250 if (x == min_jlong && y == CONST64(-1)) { 251 return 0; 252 } else { 253 return x % y; 254 } 255 JRT_END 256 257 258 const juint float_sign_mask = 0x7FFFFFFF; 259 const juint float_infinity = 0x7F800000; 260 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF); 261 const julong double_infinity = CONST64(0x7FF0000000000000); 262 263 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y)) 264 #ifdef _WIN64 265 // 64-bit Windows on amd64 returns the wrong values for 266 // infinity operands. 267 union { jfloat f; juint i; } xbits, ybits; 268 xbits.f = x; 269 ybits.f = y; 270 // x Mod Infinity == x unless x is infinity 271 if ( ((xbits.i & float_sign_mask) != float_infinity) && 272 ((ybits.i & float_sign_mask) == float_infinity) ) { 273 return x; 274 } 275 #endif 276 return ((jfloat)fmod((double)x,(double)y)); 277 JRT_END 278 279 280 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y)) 281 #ifdef _WIN64 282 union { jdouble d; julong l; } xbits, ybits; 283 xbits.d = x; 284 ybits.d = y; 285 // x Mod Infinity == x unless x is infinity 286 if ( ((xbits.l & double_sign_mask) != double_infinity) && 287 ((ybits.l & double_sign_mask) == double_infinity) ) { 288 return x; 289 } 290 #endif 291 return ((jdouble)fmod((double)x,(double)y)); 292 JRT_END 293 294 #ifdef __SOFTFP__ 295 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y)) 296 return x + y; 297 JRT_END 298 299 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y)) 300 return x - y; 301 JRT_END 302 303 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y)) 304 return x * y; 305 JRT_END 306 307 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y)) 308 return x / y; 309 JRT_END 310 311 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y)) 312 return x + y; 313 JRT_END 314 315 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y)) 316 return x - y; 317 JRT_END 318 319 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y)) 320 return x * y; 321 JRT_END 322 323 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y)) 324 return x / y; 325 JRT_END 326 327 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x)) 328 return (jfloat)x; 329 JRT_END 330 331 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x)) 332 return (jdouble)x; 333 JRT_END 334 335 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x)) 336 return (jdouble)x; 337 JRT_END 338 339 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y)) 340 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/ 341 JRT_END 342 343 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y)) 344 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 345 JRT_END 346 347 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y)) 348 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */ 349 JRT_END 350 351 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y)) 352 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */ 353 JRT_END 354 355 // Functions to return the opposite of the aeabi functions for nan. 356 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y)) 357 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 358 JRT_END 359 360 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y)) 361 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 362 JRT_END 363 364 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y)) 365 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 366 JRT_END 367 368 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y)) 369 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 370 JRT_END 371 372 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y)) 373 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 374 JRT_END 375 376 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y)) 377 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 378 JRT_END 379 380 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y)) 381 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 382 JRT_END 383 384 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y)) 385 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0); 386 JRT_END 387 388 // Intrinsics make gcc generate code for these. 389 float SharedRuntime::fneg(float f) { 390 return -f; 391 } 392 393 double SharedRuntime::dneg(double f) { 394 return -f; 395 } 396 397 #endif // __SOFTFP__ 398 399 #if defined(__SOFTFP__) || defined(E500V2) 400 // Intrinsics make gcc generate code for these. 401 double SharedRuntime::dabs(double f) { 402 return (f <= (double)0.0) ? (double)0.0 - f : f; 403 } 404 405 #endif 406 407 #if defined(__SOFTFP__) || defined(PPC) 408 double SharedRuntime::dsqrt(double f) { 409 return sqrt(f); 410 } 411 #endif 412 413 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x)) 414 if (g_isnan(x)) 415 return 0; 416 if (x >= (jfloat) max_jint) 417 return max_jint; 418 if (x <= (jfloat) min_jint) 419 return min_jint; 420 return (jint) x; 421 JRT_END 422 423 424 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x)) 425 if (g_isnan(x)) 426 return 0; 427 if (x >= (jfloat) max_jlong) 428 return max_jlong; 429 if (x <= (jfloat) min_jlong) 430 return min_jlong; 431 return (jlong) x; 432 JRT_END 433 434 435 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x)) 436 if (g_isnan(x)) 437 return 0; 438 if (x >= (jdouble) max_jint) 439 return max_jint; 440 if (x <= (jdouble) min_jint) 441 return min_jint; 442 return (jint) x; 443 JRT_END 444 445 446 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x)) 447 if (g_isnan(x)) 448 return 0; 449 if (x >= (jdouble) max_jlong) 450 return max_jlong; 451 if (x <= (jdouble) min_jlong) 452 return min_jlong; 453 return (jlong) x; 454 JRT_END 455 456 457 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x)) 458 return (jfloat)x; 459 JRT_END 460 461 462 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x)) 463 return (jfloat)x; 464 JRT_END 465 466 467 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x)) 468 return (jdouble)x; 469 JRT_END 470 471 // Exception handling accross interpreter/compiler boundaries 472 // 473 // exception_handler_for_return_address(...) returns the continuation address. 474 // The continuation address is the entry point of the exception handler of the 475 // previous frame depending on the return address. 476 477 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) { 478 assert(frame::verify_return_pc(return_address), err_msg("must be a return address: " INTPTR_FORMAT, return_address)); 479 480 // Reset method handle flag. 481 thread->set_is_method_handle_return(false); 482 483 // The fastest case first 484 CodeBlob* blob = CodeCache::find_blob(return_address); 485 nmethod* nm = (blob != NULL) ? blob->as_nmethod_or_null() : NULL; 486 if (nm != NULL) { 487 // Set flag if return address is a method handle call site. 488 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address)); 489 // native nmethods don't have exception handlers 490 assert(!nm->is_native_method(), "no exception handler"); 491 assert(nm->header_begin() != nm->exception_begin(), "no exception handler"); 492 if (nm->is_deopt_pc(return_address)) { 493 return SharedRuntime::deopt_blob()->unpack_with_exception(); 494 } else { 495 return nm->exception_begin(); 496 } 497 } 498 499 // Entry code 500 if (StubRoutines::returns_to_call_stub(return_address)) { 501 return StubRoutines::catch_exception_entry(); 502 } 503 // Interpreted code 504 if (Interpreter::contains(return_address)) { 505 return Interpreter::rethrow_exception_entry(); 506 } 507 508 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub"); 509 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!"); 510 511 #ifndef PRODUCT 512 { ResourceMark rm; 513 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address); 514 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here"); 515 tty->print_cr("b) other problem"); 516 } 517 #endif // PRODUCT 518 519 ShouldNotReachHere(); 520 return NULL; 521 } 522 523 524 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address)) 525 return raw_exception_handler_for_return_address(thread, return_address); 526 JRT_END 527 528 529 address SharedRuntime::get_poll_stub(address pc) { 530 address stub; 531 // Look up the code blob 532 CodeBlob *cb = CodeCache::find_blob(pc); 533 534 // Should be an nmethod 535 assert( cb && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod" ); 536 537 // Look up the relocation information 538 assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc), 539 "safepoint polling: type must be poll" ); 540 541 assert( ((NativeInstruction*)pc)->is_safepoint_poll(), 542 "Only polling locations are used for safepoint"); 543 544 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc); 545 bool has_wide_vectors = ((nmethod*)cb)->has_wide_vectors(); 546 if (at_poll_return) { 547 assert(SharedRuntime::polling_page_return_handler_blob() != NULL, 548 "polling page return stub not created yet"); 549 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point(); 550 } else if (has_wide_vectors) { 551 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL, 552 "polling page vectors safepoint stub not created yet"); 553 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point(); 554 } else { 555 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL, 556 "polling page safepoint stub not created yet"); 557 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point(); 558 } 559 #ifndef PRODUCT 560 if( TraceSafepoint ) { 561 char buf[256]; 562 jio_snprintf(buf, sizeof(buf), 563 "... found polling page %s exception at pc = " 564 INTPTR_FORMAT ", stub =" INTPTR_FORMAT, 565 at_poll_return ? "return" : "loop", 566 (intptr_t)pc, (intptr_t)stub); 567 tty->print_raw_cr(buf); 568 } 569 #endif // PRODUCT 570 return stub; 571 } 572 573 574 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) { 575 assert(caller.is_interpreted_frame(), ""); 576 int args_size = ArgumentSizeComputer(sig).size() + 1; 577 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack"); 578 oop result = (oop) *caller.interpreter_frame_tos_at(args_size - 1); 579 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop"); 580 return result; 581 } 582 583 584 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) { 585 if (JvmtiExport::can_post_on_exceptions()) { 586 vframeStream vfst(thread, true); 587 methodHandle method = methodHandle(thread, vfst.method()); 588 address bcp = method()->bcp_from(vfst.bci()); 589 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception()); 590 } 591 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception); 592 } 593 594 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) { 595 Handle h_exception = Exceptions::new_exception(thread, name, message); 596 throw_and_post_jvmti_exception(thread, h_exception); 597 } 598 599 // The interpreter code to call this tracing function is only 600 // called/generated when TraceRedefineClasses has the right bits 601 // set. Since obsolete methods are never compiled, we don't have 602 // to modify the compilers to generate calls to this function. 603 // 604 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry( 605 JavaThread* thread, Method* method)) 606 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call"); 607 608 if (method->is_obsolete()) { 609 // We are calling an obsolete method, but this is not necessarily 610 // an error. Our method could have been redefined just after we 611 // fetched the Method* from the constant pool. 612 613 // RC_TRACE macro has an embedded ResourceMark 614 RC_TRACE_WITH_THREAD(0x00001000, thread, 615 ("calling obsolete method '%s'", 616 method->name_and_sig_as_C_string())); 617 if (RC_TRACE_ENABLED(0x00002000)) { 618 // this option is provided to debug calls to obsolete methods 619 guarantee(false, "faulting at call to an obsolete method."); 620 } 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(nmethod* nm, address ret_pc, Handle& exception, 628 bool force_unwind, bool top_frame_only) { 629 assert(nm != NULL, "must exist"); 630 ResourceMark rm; 631 632 ScopeDesc* sd = nm->scope_desc_at(ret_pc); 633 // determine handler bci, if any 634 EXCEPTION_MARK; 635 636 int handler_bci = -1; 637 int scope_depth = 0; 638 if (!force_unwind) { 639 int bci = sd->bci(); 640 bool recursive_exception = false; 641 do { 642 bool skip_scope_increment = false; 643 // exception handler lookup 644 KlassHandle ek (THREAD, exception->klass()); 645 handler_bci = sd->method()->fast_exception_handler_bci_for(ek, bci, THREAD); 646 if (HAS_PENDING_EXCEPTION) { 647 recursive_exception = true; 648 // We threw an exception while trying to find the exception handler. 649 // Transfer the new exception to the exception handle which will 650 // be set into thread local storage, and do another lookup for an 651 // exception handler for this exception, this time starting at the 652 // BCI of the exception handler which caused the exception to be 653 // thrown (bugs 4307310 and 4546590). Set "exception" reference 654 // argument to ensure that the correct exception is thrown (4870175). 655 exception = Handle(THREAD, PENDING_EXCEPTION); 656 CLEAR_PENDING_EXCEPTION; 657 if (handler_bci >= 0) { 658 bci = handler_bci; 659 handler_bci = -1; 660 skip_scope_increment = true; 661 } 662 } 663 else { 664 recursive_exception = false; 665 } 666 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) { 667 sd = sd->sender(); 668 if (sd != NULL) { 669 bci = sd->bci(); 670 } 671 ++scope_depth; 672 } 673 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL)); 674 } 675 676 // found handling method => lookup exception handler 677 int catch_pco = ret_pc - nm->code_begin(); 678 679 ExceptionHandlerTable table(nm); 680 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth); 681 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) { 682 // Allow abbreviated catch tables. The idea is to allow a method 683 // to materialize its exceptions without committing to the exact 684 // routing of exceptions. In particular this is needed for adding 685 // a synthethic handler to unlock monitors when inlining 686 // synchonized methods since the unlock path isn't represented in 687 // the bytecodes. 688 t = table.entry_for(catch_pco, -1, 0); 689 } 690 691 #ifdef COMPILER1 692 if (t == NULL && nm->is_compiled_by_c1()) { 693 assert(nm->unwind_handler_begin() != NULL, ""); 694 return nm->unwind_handler_begin(); 695 } 696 #endif 697 698 if (t == NULL) { 699 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci); 700 tty->print_cr(" Exception:"); 701 exception->print(); 702 tty->cr(); 703 tty->print_cr(" Compiled exception table :"); 704 table.print(); 705 nm->print_code(); 706 guarantee(false, "missing exception handler"); 707 return NULL; 708 } 709 710 return nm->code_begin() + t->pco(); 711 } 712 713 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread)) 714 // These errors occur only at call sites 715 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError()); 716 JRT_END 717 718 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 719 // These errors occur only at call sites 720 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub"); 721 JRT_END 722 723 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread)) 724 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 725 JRT_END 726 727 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread)) 728 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 729 JRT_END 730 731 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread)) 732 // This entry point is effectively only used for NullPointerExceptions which occur at inline 733 // cache sites (when the callee activation is not yet set up) so we are at a call site 734 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 735 JRT_END 736 737 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread)) 738 // We avoid using the normal exception construction in this case because 739 // it performs an upcall to Java, and we're already out of stack space. 740 Klass* k = SystemDictionary::StackOverflowError_klass(); 741 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK); 742 Handle exception (thread, exception_oop); 743 if (StackTraceInThrowable) { 744 java_lang_Throwable::fill_in_stack_trace(exception); 745 } 746 throw_and_post_jvmti_exception(thread, exception); 747 JRT_END 748 749 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread, 750 address pc, 751 SharedRuntime::ImplicitExceptionKind exception_kind) 752 { 753 address target_pc = NULL; 754 755 if (Interpreter::contains(pc)) { 756 #ifdef CC_INTERP 757 // C++ interpreter doesn't throw implicit exceptions 758 ShouldNotReachHere(); 759 #else 760 switch (exception_kind) { 761 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry(); 762 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry(); 763 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry(); 764 default: ShouldNotReachHere(); 765 } 766 #endif // !CC_INTERP 767 } else { 768 switch (exception_kind) { 769 case STACK_OVERFLOW: { 770 // Stack overflow only occurs upon frame setup; the callee is 771 // going to be unwound. Dispatch to a shared runtime stub 772 // which will cause the StackOverflowError to be fabricated 773 // and processed. 774 // For stack overflow in deoptimization blob, cleanup thread. 775 if (thread->deopt_mark() != NULL) { 776 Deoptimization::cleanup_deopt_info(thread, NULL); 777 } 778 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, pc); 779 return StubRoutines::throw_StackOverflowError_entry(); 780 } 781 782 case IMPLICIT_NULL: { 783 if (VtableStubs::contains(pc)) { 784 // We haven't yet entered the callee frame. Fabricate an 785 // exception and begin dispatching it in the caller. Since 786 // the caller was at a call site, it's safe to destroy all 787 // caller-saved registers, as these entry points do. 788 VtableStub* vt_stub = VtableStubs::stub_containing(pc); 789 790 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error. 791 if (vt_stub == NULL) return NULL; 792 793 if (vt_stub->is_abstract_method_error(pc)) { 794 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs"); 795 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, pc); 796 return StubRoutines::throw_AbstractMethodError_entry(); 797 } else { 798 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, pc); 799 return StubRoutines::throw_NullPointerException_at_call_entry(); 800 } 801 } else { 802 CodeBlob* cb = CodeCache::find_blob(pc); 803 804 // If code blob is NULL, then return NULL to signal handler to report the SEGV error. 805 if (cb == NULL) return NULL; 806 807 // Exception happened in CodeCache. Must be either: 808 // 1. Inline-cache check in C2I handler blob, 809 // 2. Inline-cache check in nmethod, or 810 // 3. Implict null exception in nmethod 811 812 if (!cb->is_nmethod()) { 813 guarantee(cb->is_adapter_blob() || cb->is_method_handles_adapter_blob(), 814 "exception happened outside interpreter, nmethods and vtable stubs (1)"); 815 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, pc); 816 // There is no handler here, so we will simply unwind. 817 return StubRoutines::throw_NullPointerException_at_call_entry(); 818 } 819 820 // Otherwise, it's an nmethod. Consult its exception handlers. 821 nmethod* nm = (nmethod*)cb; 822 if (nm->inlinecache_check_contains(pc)) { 823 // exception happened inside inline-cache check code 824 // => the nmethod is not yet active (i.e., the frame 825 // is not set up yet) => use return address pushed by 826 // caller => don't push another return address 827 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, pc); 828 return StubRoutines::throw_NullPointerException_at_call_entry(); 829 } 830 831 if (nm->method()->is_method_handle_intrinsic()) { 832 // exception happened inside MH dispatch code, similar to a vtable stub 833 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, pc); 834 return StubRoutines::throw_NullPointerException_at_call_entry(); 835 } 836 837 #ifndef PRODUCT 838 _implicit_null_throws++; 839 #endif 840 target_pc = nm->continuation_for_implicit_exception(pc); 841 // If there's an unexpected fault, target_pc might be NULL, 842 // in which case we want to fall through into the normal 843 // error handling code. 844 } 845 846 break; // fall through 847 } 848 849 850 case IMPLICIT_DIVIDE_BY_ZERO: { 851 nmethod* nm = CodeCache::find_nmethod(pc); 852 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions"); 853 #ifndef PRODUCT 854 _implicit_div0_throws++; 855 #endif 856 target_pc = nm->continuation_for_implicit_exception(pc); 857 // If there's an unexpected fault, target_pc might be NULL, 858 // in which case we want to fall through into the normal 859 // error handling code. 860 break; // fall through 861 } 862 863 default: ShouldNotReachHere(); 864 } 865 866 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind"); 867 868 // for AbortVMOnException flag 869 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException")); 870 if (exception_kind == IMPLICIT_NULL) { 871 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc); 872 } else { 873 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc); 874 } 875 return target_pc; 876 } 877 878 ShouldNotReachHere(); 879 return NULL; 880 } 881 882 883 JNI_ENTRY(void, throw_unsatisfied_link_error(JNIEnv* env, ...)) 884 { 885 THROW(vmSymbols::java_lang_UnsatisfiedLinkError()); 886 } 887 JNI_END 888 889 JNI_ENTRY(void, throw_unsupported_operation_exception(JNIEnv* env, ...)) 890 { 891 THROW(vmSymbols::java_lang_UnsupportedOperationException()); 892 } 893 JNI_END 894 895 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() { 896 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error); 897 } 898 899 address SharedRuntime::native_method_throw_unsupported_operation_exception_entry() { 900 return CAST_FROM_FN_PTR(address, &throw_unsupported_operation_exception); 901 } 902 903 904 #ifndef PRODUCT 905 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2)) 906 const frame f = thread->last_frame(); 907 assert(f.is_interpreted_frame(), "must be an interpreted frame"); 908 #ifndef PRODUCT 909 methodHandle mh(THREAD, f.interpreter_frame_method()); 910 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2); 911 #endif // !PRODUCT 912 return preserve_this_value; 913 JRT_END 914 #endif // !PRODUCT 915 916 917 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts)) 918 os::yield_all(attempts); 919 JRT_END 920 921 922 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) 923 assert(obj->is_oop(), "must be a valid oop"); 924 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise"); 925 InstanceKlass::register_finalizer(instanceOop(obj), CHECK); 926 JRT_END 927 928 929 jlong SharedRuntime::get_java_tid(Thread* thread) { 930 if (thread != NULL) { 931 if (thread->is_Java_thread()) { 932 oop obj = ((JavaThread*)thread)->threadObj(); 933 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj); 934 } 935 } 936 return 0; 937 } 938 939 /** 940 * This function ought to be a void function, but cannot be because 941 * it gets turned into a tail-call on sparc, which runs into dtrace bug 942 * 6254741. Once that is fixed we can remove the dummy return value. 943 */ 944 int SharedRuntime::dtrace_object_alloc(oopDesc* o) { 945 return dtrace_object_alloc_base(Thread::current(), o); 946 } 947 948 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o) { 949 assert(DTraceAllocProbes, "wrong call"); 950 Klass* klass = o->klass(); 951 int size = o->size(); 952 Symbol* name = klass->name(); 953 #ifndef USDT2 954 HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread), 955 name->bytes(), name->utf8_length(), size * HeapWordSize); 956 #else /* USDT2 */ 957 HOTSPOT_OBJECT_ALLOC( 958 get_java_tid(thread), 959 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize); 960 #endif /* USDT2 */ 961 return 0; 962 } 963 964 JRT_LEAF(int, SharedRuntime::dtrace_method_entry( 965 JavaThread* thread, Method* method)) 966 assert(DTraceMethodProbes, "wrong call"); 967 Symbol* kname = method->klass_name(); 968 Symbol* name = method->name(); 969 Symbol* sig = method->signature(); 970 #ifndef USDT2 971 HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread), 972 kname->bytes(), kname->utf8_length(), 973 name->bytes(), name->utf8_length(), 974 sig->bytes(), sig->utf8_length()); 975 #else /* USDT2 */ 976 HOTSPOT_METHOD_ENTRY( 977 get_java_tid(thread), 978 (char *) kname->bytes(), kname->utf8_length(), 979 (char *) name->bytes(), name->utf8_length(), 980 (char *) sig->bytes(), sig->utf8_length()); 981 #endif /* USDT2 */ 982 return 0; 983 JRT_END 984 985 JRT_LEAF(int, SharedRuntime::dtrace_method_exit( 986 JavaThread* thread, Method* method)) 987 assert(DTraceMethodProbes, "wrong call"); 988 Symbol* kname = method->klass_name(); 989 Symbol* name = method->name(); 990 Symbol* sig = method->signature(); 991 #ifndef USDT2 992 HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread), 993 kname->bytes(), kname->utf8_length(), 994 name->bytes(), name->utf8_length(), 995 sig->bytes(), sig->utf8_length()); 996 #else /* USDT2 */ 997 HOTSPOT_METHOD_RETURN( 998 get_java_tid(thread), 999 (char *) kname->bytes(), kname->utf8_length(), 1000 (char *) name->bytes(), name->utf8_length(), 1001 (char *) sig->bytes(), sig->utf8_length()); 1002 #endif /* USDT2 */ 1003 return 0; 1004 JRT_END 1005 1006 1007 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode) 1008 // for a call current in progress, i.e., arguments has been pushed on stack 1009 // put callee has not been invoked yet. Used by: resolve virtual/static, 1010 // vtable updates, etc. Caller frame must be compiled. 1011 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) { 1012 ResourceMark rm(THREAD); 1013 1014 // last java frame on stack (which includes native call frames) 1015 vframeStream vfst(thread, true); // Do not skip and javaCalls 1016 1017 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle())); 1018 } 1019 1020 1021 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode 1022 // for a call current in progress, i.e., arguments has been pushed on stack 1023 // but callee has not been invoked yet. Caller frame must be compiled. 1024 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread, 1025 vframeStream& vfst, 1026 Bytecodes::Code& bc, 1027 CallInfo& callinfo, TRAPS) { 1028 Handle receiver; 1029 Handle nullHandle; //create a handy null handle for exception returns 1030 1031 assert(!vfst.at_end(), "Java frame must exist"); 1032 1033 // Find caller and bci from vframe 1034 methodHandle caller(THREAD, vfst.method()); 1035 int bci = vfst.bci(); 1036 1037 // Find bytecode 1038 Bytecode_invoke bytecode(caller, bci); 1039 bc = bytecode.invoke_code(); 1040 int bytecode_index = bytecode.index(); 1041 1042 // Find receiver for non-static call 1043 if (bc != Bytecodes::_invokestatic && 1044 bc != Bytecodes::_invokedynamic) { 1045 // This register map must be update since we need to find the receiver for 1046 // compiled frames. The receiver might be in a register. 1047 RegisterMap reg_map2(thread); 1048 frame stubFrame = thread->last_frame(); 1049 // Caller-frame is a compiled frame 1050 frame callerFrame = stubFrame.sender(®_map2); 1051 1052 methodHandle callee = bytecode.static_target(CHECK_(nullHandle)); 1053 if (callee.is_null()) { 1054 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle); 1055 } 1056 // Retrieve from a compiled argument list 1057 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2)); 1058 1059 if (receiver.is_null()) { 1060 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle); 1061 } 1062 } 1063 1064 // Resolve method. This is parameterized by bytecode. 1065 constantPoolHandle constants(THREAD, caller->constants()); 1066 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver"); 1067 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle)); 1068 1069 #ifdef ASSERT 1070 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls 1071 if (bc != Bytecodes::_invokestatic && bc != Bytecodes::_invokedynamic) { 1072 assert(receiver.not_null(), "should have thrown exception"); 1073 KlassHandle receiver_klass(THREAD, receiver->klass()); 1074 Klass* rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle)); 1075 // klass is already loaded 1076 KlassHandle static_receiver_klass(THREAD, rk); 1077 // Method handle invokes might have been optimized to a direct call 1078 // so don't check for the receiver class. 1079 // FIXME this weakens the assert too much 1080 methodHandle callee = callinfo.selected_method(); 1081 assert(receiver_klass->is_subtype_of(static_receiver_klass()) || 1082 callee->is_method_handle_intrinsic() || 1083 callee->is_compiled_lambda_form(), 1084 "actual receiver must be subclass of static receiver klass"); 1085 if (receiver_klass->oop_is_instance()) { 1086 if (InstanceKlass::cast(receiver_klass())->is_not_initialized()) { 1087 tty->print_cr("ERROR: Klass not yet initialized!!"); 1088 receiver_klass()->print(); 1089 } 1090 assert(!InstanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized"); 1091 } 1092 } 1093 #endif 1094 1095 return receiver; 1096 } 1097 1098 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) { 1099 ResourceMark rm(THREAD); 1100 // We need first to check if any Java activations (compiled, interpreted) 1101 // exist on the stack since last JavaCall. If not, we need 1102 // to get the target method from the JavaCall wrapper. 1103 vframeStream vfst(thread, true); // Do not skip any javaCalls 1104 methodHandle callee_method; 1105 if (vfst.at_end()) { 1106 // No Java frames were found on stack since we did the JavaCall. 1107 // Hence the stack can only contain an entry_frame. We need to 1108 // find the target method from the stub frame. 1109 RegisterMap reg_map(thread, false); 1110 frame fr = thread->last_frame(); 1111 assert(fr.is_runtime_frame(), "must be a runtimeStub"); 1112 fr = fr.sender(®_map); 1113 assert(fr.is_entry_frame(), "must be"); 1114 // fr is now pointing to the entry frame. 1115 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method()); 1116 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??"); 1117 } else { 1118 Bytecodes::Code bc; 1119 CallInfo callinfo; 1120 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle())); 1121 callee_method = callinfo.selected_method(); 1122 } 1123 assert(callee_method()->is_method(), "must be"); 1124 return callee_method; 1125 } 1126 1127 // Resolves a call. 1128 methodHandle SharedRuntime::resolve_helper(JavaThread *thread, 1129 bool is_virtual, 1130 bool is_optimized, TRAPS) { 1131 methodHandle callee_method; 1132 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1133 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 1134 int retry_count = 0; 1135 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() && 1136 callee_method->method_holder() != SystemDictionary::Object_klass()) { 1137 // If has a pending exception then there is no need to re-try to 1138 // resolve this method. 1139 // If the method has been redefined, we need to try again. 1140 // Hack: we have no way to update the vtables of arrays, so don't 1141 // require that java.lang.Object has been updated. 1142 1143 // It is very unlikely that method is redefined more than 100 times 1144 // in the middle of resolve. If it is looping here more than 100 times 1145 // means then there could be a bug here. 1146 guarantee((retry_count++ < 100), 1147 "Could not resolve to latest version of redefined method"); 1148 // method is redefined in the middle of resolve so re-try. 1149 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 1150 } 1151 } 1152 return callee_method; 1153 } 1154 1155 // Resolves a call. The compilers generate code for calls that go here 1156 // and are patched with the real destination of the call. 1157 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread, 1158 bool is_virtual, 1159 bool is_optimized, TRAPS) { 1160 1161 ResourceMark rm(thread); 1162 RegisterMap cbl_map(thread, false); 1163 frame caller_frame = thread->last_frame().sender(&cbl_map); 1164 1165 CodeBlob* caller_cb = caller_frame.cb(); 1166 guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod"); 1167 nmethod* caller_nm = caller_cb->as_nmethod_or_null(); 1168 // make sure caller is not getting deoptimized 1169 // and removed before we are done with it. 1170 // CLEANUP - with lazy deopt shouldn't need this lock 1171 nmethodLocker caller_lock(caller_nm); 1172 1173 1174 // determine call info & receiver 1175 // note: a) receiver is NULL for static calls 1176 // b) an exception is thrown if receiver is NULL for non-static calls 1177 CallInfo call_info; 1178 Bytecodes::Code invoke_code = Bytecodes::_illegal; 1179 Handle receiver = find_callee_info(thread, invoke_code, 1180 call_info, CHECK_(methodHandle())); 1181 methodHandle callee_method = call_info.selected_method(); 1182 1183 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) || 1184 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) || 1185 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) || 1186 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode"); 1187 1188 #ifndef PRODUCT 1189 // tracing/debugging/statistics 1190 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) : 1191 (is_virtual) ? (&_resolve_virtual_ctr) : 1192 (&_resolve_static_ctr); 1193 Atomic::inc(addr); 1194 1195 if (TraceCallFixup) { 1196 ResourceMark rm(thread); 1197 tty->print("resolving %s%s (%s) call to", 1198 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static", 1199 Bytecodes::name(invoke_code)); 1200 callee_method->print_short_name(tty); 1201 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, caller_frame.pc(), callee_method->code()); 1202 } 1203 #endif 1204 1205 // JSR 292 key invariant: 1206 // If the resolved method is a MethodHandle invoke target the call 1207 // site must be a MethodHandle call site, because the lambda form might tail-call 1208 // leaving the stack in a state unknown to either caller or callee 1209 // TODO detune for now but we might need it again 1210 // assert(!callee_method->is_compiled_lambda_form() || 1211 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site"); 1212 1213 // Compute entry points. This might require generation of C2I converter 1214 // frames, so we cannot be holding any locks here. Furthermore, the 1215 // computation of the entry points is independent of patching the call. We 1216 // always return the entry-point, but we only patch the stub if the call has 1217 // not been deoptimized. Return values: For a virtual call this is an 1218 // (cached_oop, destination address) pair. For a static call/optimized 1219 // virtual this is just a destination address. 1220 1221 StaticCallInfo static_call_info; 1222 CompiledICInfo virtual_call_info; 1223 1224 // Make sure the callee nmethod does not get deoptimized and removed before 1225 // we are done patching the code. 1226 nmethod* callee_nm = callee_method->code(); 1227 nmethodLocker nl_callee(callee_nm); 1228 #ifdef ASSERT 1229 address dest_entry_point = callee_nm == NULL ? 0 : callee_nm->entry_point(); // used below 1230 #endif 1231 1232 if (is_virtual) { 1233 assert(receiver.not_null(), "sanity check"); 1234 bool static_bound = call_info.resolved_method()->can_be_statically_bound(); 1235 KlassHandle h_klass(THREAD, receiver->klass()); 1236 CompiledIC::compute_monomorphic_entry(callee_method, h_klass, 1237 is_optimized, static_bound, virtual_call_info, 1238 CHECK_(methodHandle())); 1239 } else { 1240 // static call 1241 CompiledStaticCall::compute_entry(callee_method, static_call_info); 1242 } 1243 1244 // grab lock, check for deoptimization and potentially patch caller 1245 { 1246 MutexLocker ml_patch(CompiledIC_lock); 1247 1248 // Now that we are ready to patch if the Method* was redefined then 1249 // don't update call site and let the caller retry. 1250 1251 if (!callee_method->is_old()) { 1252 #ifdef ASSERT 1253 // We must not try to patch to jump to an already unloaded method. 1254 if (dest_entry_point != 0) { 1255 assert(CodeCache::find_blob(dest_entry_point) != NULL, 1256 "should not unload nmethod while locked"); 1257 } 1258 #endif 1259 if (is_virtual) { 1260 nmethod* nm = callee_nm; 1261 if (nm == NULL) CodeCache::find_blob(caller_frame.pc()); 1262 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc()); 1263 if (inline_cache->is_clean()) { 1264 inline_cache->set_to_monomorphic(virtual_call_info); 1265 } 1266 } else { 1267 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc()); 1268 if (ssc->is_clean()) ssc->set(static_call_info); 1269 } 1270 } 1271 1272 } // unlock CompiledIC_lock 1273 1274 return callee_method; 1275 } 1276 1277 1278 // Inline caches exist only in compiled code 1279 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread)) 1280 #ifdef ASSERT 1281 RegisterMap reg_map(thread, false); 1282 frame stub_frame = thread->last_frame(); 1283 assert(stub_frame.is_runtime_frame(), "sanity check"); 1284 frame caller_frame = stub_frame.sender(®_map); 1285 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame"); 1286 #endif /* ASSERT */ 1287 1288 methodHandle callee_method; 1289 JRT_BLOCK 1290 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL); 1291 // Return Method* through TLS 1292 thread->set_vm_result_2(callee_method()); 1293 JRT_BLOCK_END 1294 // return compiled code entry point after potential safepoints 1295 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1296 return callee_method->verified_code_entry(); 1297 JRT_END 1298 1299 1300 // Handle call site that has been made non-entrant 1301 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread)) 1302 // 6243940 We might end up in here if the callee is deoptimized 1303 // as we race to call it. We don't want to take a safepoint if 1304 // the caller was interpreted because the caller frame will look 1305 // interpreted to the stack walkers and arguments are now 1306 // "compiled" so it is much better to make this transition 1307 // invisible to the stack walking code. The i2c path will 1308 // place the callee method in the callee_target. It is stashed 1309 // there because if we try and find the callee by normal means a 1310 // safepoint is possible and have trouble gc'ing the compiled args. 1311 RegisterMap reg_map(thread, false); 1312 frame stub_frame = thread->last_frame(); 1313 assert(stub_frame.is_runtime_frame(), "sanity check"); 1314 frame caller_frame = stub_frame.sender(®_map); 1315 1316 // MethodHandle invokes don't have a CompiledIC and should always 1317 // simply redispatch to the callee_target. 1318 address sender_pc = caller_frame.pc(); 1319 CodeBlob* sender_cb = caller_frame.cb(); 1320 nmethod* sender_nm = sender_cb->as_nmethod_or_null(); 1321 1322 if (caller_frame.is_interpreted_frame() || 1323 caller_frame.is_entry_frame()) { 1324 Method* callee = thread->callee_target(); 1325 guarantee(callee != NULL && callee->is_method(), "bad handshake"); 1326 thread->set_vm_result_2(callee); 1327 thread->set_callee_target(NULL); 1328 return callee->get_c2i_entry(); 1329 } 1330 1331 // Must be compiled to compiled path which is safe to stackwalk 1332 methodHandle callee_method; 1333 JRT_BLOCK 1334 // Force resolving of caller (if we called from compiled frame) 1335 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL); 1336 thread->set_vm_result_2(callee_method()); 1337 JRT_BLOCK_END 1338 // return compiled code entry point after potential safepoints 1339 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1340 return callee_method->verified_code_entry(); 1341 JRT_END 1342 1343 1344 // resolve a static call and patch code 1345 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread )) 1346 methodHandle callee_method; 1347 JRT_BLOCK 1348 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL); 1349 thread->set_vm_result_2(callee_method()); 1350 JRT_BLOCK_END 1351 // return compiled code entry point after potential safepoints 1352 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1353 return callee_method->verified_code_entry(); 1354 JRT_END 1355 1356 1357 // resolve virtual call and update inline cache to monomorphic 1358 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread )) 1359 methodHandle callee_method; 1360 JRT_BLOCK 1361 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL); 1362 thread->set_vm_result_2(callee_method()); 1363 JRT_BLOCK_END 1364 // return compiled code entry point after potential safepoints 1365 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1366 return callee_method->verified_code_entry(); 1367 JRT_END 1368 1369 1370 // Resolve a virtual call that can be statically bound (e.g., always 1371 // monomorphic, so it has no inline cache). Patch code to resolved target. 1372 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread)) 1373 methodHandle callee_method; 1374 JRT_BLOCK 1375 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL); 1376 thread->set_vm_result_2(callee_method()); 1377 JRT_BLOCK_END 1378 // return compiled code entry point after potential safepoints 1379 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1380 return callee_method->verified_code_entry(); 1381 JRT_END 1382 1383 1384 1385 1386 1387 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) { 1388 ResourceMark rm(thread); 1389 CallInfo call_info; 1390 Bytecodes::Code bc; 1391 1392 // receiver is NULL for static calls. An exception is thrown for NULL 1393 // receivers for non-static calls 1394 Handle receiver = find_callee_info(thread, bc, call_info, 1395 CHECK_(methodHandle())); 1396 // Compiler1 can produce virtual call sites that can actually be statically bound 1397 // If we fell thru to below we would think that the site was going megamorphic 1398 // when in fact the site can never miss. Worse because we'd think it was megamorphic 1399 // we'd try and do a vtable dispatch however methods that can be statically bound 1400 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a 1401 // reresolution of the call site (as if we did a handle_wrong_method and not an 1402 // plain ic_miss) and the site will be converted to an optimized virtual call site 1403 // never to miss again. I don't believe C2 will produce code like this but if it 1404 // did this would still be the correct thing to do for it too, hence no ifdef. 1405 // 1406 if (call_info.resolved_method()->can_be_statically_bound()) { 1407 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle())); 1408 if (TraceCallFixup) { 1409 RegisterMap reg_map(thread, false); 1410 frame caller_frame = thread->last_frame().sender(®_map); 1411 ResourceMark rm(thread); 1412 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc)); 1413 callee_method->print_short_name(tty); 1414 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc()); 1415 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1416 } 1417 return callee_method; 1418 } 1419 1420 methodHandle callee_method = call_info.selected_method(); 1421 1422 bool should_be_mono = false; 1423 1424 #ifndef PRODUCT 1425 Atomic::inc(&_ic_miss_ctr); 1426 1427 // Statistics & Tracing 1428 if (TraceCallFixup) { 1429 ResourceMark rm(thread); 1430 tty->print("IC miss (%s) call to", Bytecodes::name(bc)); 1431 callee_method->print_short_name(tty); 1432 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1433 } 1434 1435 if (ICMissHistogram) { 1436 MutexLocker m(VMStatistic_lock); 1437 RegisterMap reg_map(thread, false); 1438 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub 1439 // produce statistics under the lock 1440 trace_ic_miss(f.pc()); 1441 } 1442 #endif 1443 1444 // install an event collector so that when a vtable stub is created the 1445 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The 1446 // event can't be posted when the stub is created as locks are held 1447 // - instead the event will be deferred until the event collector goes 1448 // out of scope. 1449 JvmtiDynamicCodeEventCollector event_collector; 1450 1451 // Update inline cache to megamorphic. Skip update if caller has been 1452 // made non-entrant or we are called from interpreted. 1453 { MutexLocker ml_patch (CompiledIC_lock); 1454 RegisterMap reg_map(thread, false); 1455 frame caller_frame = thread->last_frame().sender(®_map); 1456 CodeBlob* cb = caller_frame.cb(); 1457 if (cb->is_nmethod() && ((nmethod*)cb)->is_in_use()) { 1458 // Not a non-entrant nmethod, so find inline_cache 1459 CompiledIC* inline_cache = CompiledIC_before(((nmethod*)cb), caller_frame.pc()); 1460 bool should_be_mono = false; 1461 if (inline_cache->is_optimized()) { 1462 if (TraceCallFixup) { 1463 ResourceMark rm(thread); 1464 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc)); 1465 callee_method->print_short_name(tty); 1466 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1467 } 1468 should_be_mono = true; 1469 } else if (inline_cache->is_icholder_call()) { 1470 CompiledICHolder* ic_oop = inline_cache->cached_icholder(); 1471 if ( ic_oop != NULL) { 1472 1473 if (receiver()->klass() == ic_oop->holder_klass()) { 1474 // This isn't a real miss. We must have seen that compiled code 1475 // is now available and we want the call site converted to a 1476 // monomorphic compiled call site. 1477 // We can't assert for callee_method->code() != NULL because it 1478 // could have been deoptimized in the meantime 1479 if (TraceCallFixup) { 1480 ResourceMark rm(thread); 1481 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc)); 1482 callee_method->print_short_name(tty); 1483 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1484 } 1485 should_be_mono = true; 1486 } 1487 } 1488 } 1489 1490 if (should_be_mono) { 1491 1492 // We have a path that was monomorphic but was going interpreted 1493 // and now we have (or had) a compiled entry. We correct the IC 1494 // by using a new icBuffer. 1495 CompiledICInfo info; 1496 KlassHandle receiver_klass(THREAD, receiver()->klass()); 1497 inline_cache->compute_monomorphic_entry(callee_method, 1498 receiver_klass, 1499 inline_cache->is_optimized(), 1500 false, 1501 info, CHECK_(methodHandle())); 1502 inline_cache->set_to_monomorphic(info); 1503 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) { 1504 // Change to megamorphic 1505 inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle())); 1506 } else { 1507 // Either clean or megamorphic 1508 } 1509 } 1510 } // Release CompiledIC_lock 1511 1512 return callee_method; 1513 } 1514 1515 // 1516 // Resets a call-site in compiled code so it will get resolved again. 1517 // This routines handles both virtual call sites, optimized virtual call 1518 // sites, and static call sites. Typically used to change a call sites 1519 // destination from compiled to interpreted. 1520 // 1521 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) { 1522 ResourceMark rm(thread); 1523 RegisterMap reg_map(thread, false); 1524 frame stub_frame = thread->last_frame(); 1525 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub"); 1526 frame caller = stub_frame.sender(®_map); 1527 1528 // Do nothing if the frame isn't a live compiled frame. 1529 // nmethod could be deoptimized by the time we get here 1530 // so no update to the caller is needed. 1531 1532 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) { 1533 1534 address pc = caller.pc(); 1535 1536 // Default call_addr is the location of the "basic" call. 1537 // Determine the address of the call we a reresolving. With 1538 // Inline Caches we will always find a recognizable call. 1539 // With Inline Caches disabled we may or may not find a 1540 // recognizable call. We will always find a call for static 1541 // calls and for optimized virtual calls. For vanilla virtual 1542 // calls it depends on the state of the UseInlineCaches switch. 1543 // 1544 // With Inline Caches disabled we can get here for a virtual call 1545 // for two reasons: 1546 // 1 - calling an abstract method. The vtable for abstract methods 1547 // will run us thru handle_wrong_method and we will eventually 1548 // end up in the interpreter to throw the ame. 1549 // 2 - a racing deoptimization. We could be doing a vanilla vtable 1550 // call and between the time we fetch the entry address and 1551 // we jump to it the target gets deoptimized. Similar to 1 1552 // we will wind up in the interprter (thru a c2i with c2). 1553 // 1554 address call_addr = NULL; 1555 { 1556 // Get call instruction under lock because another thread may be 1557 // busy patching it. 1558 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1559 // Location of call instruction 1560 if (NativeCall::is_call_before(pc)) { 1561 NativeCall *ncall = nativeCall_before(pc); 1562 call_addr = ncall->instruction_address(); 1563 } 1564 } 1565 1566 // Check for static or virtual call 1567 bool is_static_call = false; 1568 nmethod* caller_nm = CodeCache::find_nmethod(pc); 1569 // Make sure nmethod doesn't get deoptimized and removed until 1570 // this is done with it. 1571 // CLEANUP - with lazy deopt shouldn't need this lock 1572 nmethodLocker nmlock(caller_nm); 1573 1574 if (call_addr != NULL) { 1575 RelocIterator iter(caller_nm, call_addr, call_addr+1); 1576 int ret = iter.next(); // Get item 1577 if (ret) { 1578 assert(iter.addr() == call_addr, "must find call"); 1579 if (iter.type() == relocInfo::static_call_type) { 1580 is_static_call = true; 1581 } else { 1582 assert(iter.type() == relocInfo::virtual_call_type || 1583 iter.type() == relocInfo::opt_virtual_call_type 1584 , "unexpected relocInfo. type"); 1585 } 1586 } else { 1587 assert(!UseInlineCaches, "relocation info. must exist for this address"); 1588 } 1589 1590 // Cleaning the inline cache will force a new resolve. This is more robust 1591 // than directly setting it to the new destination, since resolving of calls 1592 // is always done through the same code path. (experience shows that it 1593 // leads to very hard to track down bugs, if an inline cache gets updated 1594 // to a wrong method). It should not be performance critical, since the 1595 // resolve is only done once. 1596 1597 MutexLocker ml(CompiledIC_lock); 1598 // 1599 // We do not patch the call site if the nmethod has been made non-entrant 1600 // as it is a waste of time 1601 // 1602 if (caller_nm->is_in_use()) { 1603 if (is_static_call) { 1604 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr); 1605 ssc->set_to_clean(); 1606 } else { 1607 // compiled, dispatched call (which used to call an interpreted method) 1608 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr); 1609 inline_cache->set_to_clean(); 1610 } 1611 } 1612 } 1613 1614 } 1615 1616 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle())); 1617 1618 1619 #ifndef PRODUCT 1620 Atomic::inc(&_wrong_method_ctr); 1621 1622 if (TraceCallFixup) { 1623 ResourceMark rm(thread); 1624 tty->print("handle_wrong_method reresolving call to"); 1625 callee_method->print_short_name(tty); 1626 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1627 } 1628 #endif 1629 1630 return callee_method; 1631 } 1632 1633 #ifdef ASSERT 1634 void SharedRuntime::check_member_name_argument_is_last_argument(methodHandle method, 1635 const BasicType* sig_bt, 1636 const VMRegPair* regs) { 1637 ResourceMark rm; 1638 const int total_args_passed = method->size_of_parameters(); 1639 const VMRegPair* regs_with_member_name = regs; 1640 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1); 1641 1642 const int member_arg_pos = total_args_passed - 1; 1643 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob"); 1644 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object"); 1645 1646 const bool is_outgoing = method->is_method_handle_intrinsic(); 1647 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing); 1648 1649 for (int i = 0; i < member_arg_pos; i++) { 1650 VMReg a = regs_with_member_name[i].first(); 1651 VMReg b = regs_without_member_name[i].first(); 1652 assert(a->value() == b->value(), err_msg_res("register allocation mismatch: a=%d, b=%d", a->value(), b->value())); 1653 } 1654 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg"); 1655 } 1656 #endif 1657 1658 // --------------------------------------------------------------------------- 1659 // We are calling the interpreter via a c2i. Normally this would mean that 1660 // we were called by a compiled method. However we could have lost a race 1661 // where we went int -> i2c -> c2i and so the caller could in fact be 1662 // interpreted. If the caller is compiled we attempt to patch the caller 1663 // so he no longer calls into the interpreter. 1664 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc)) 1665 Method* moop(method); 1666 1667 address entry_point = moop->from_compiled_entry(); 1668 1669 // It's possible that deoptimization can occur at a call site which hasn't 1670 // been resolved yet, in which case this function will be called from 1671 // an nmethod that has been patched for deopt and we can ignore the 1672 // request for a fixup. 1673 // Also it is possible that we lost a race in that from_compiled_entry 1674 // is now back to the i2c in that case we don't need to patch and if 1675 // we did we'd leap into space because the callsite needs to use 1676 // "to interpreter" stub in order to load up the Method*. Don't 1677 // ask me how I know this... 1678 1679 CodeBlob* cb = CodeCache::find_blob(caller_pc); 1680 if (!cb->is_nmethod() || entry_point == moop->get_c2i_entry()) { 1681 return; 1682 } 1683 1684 // The check above makes sure this is a nmethod. 1685 nmethod* nm = cb->as_nmethod_or_null(); 1686 assert(nm, "must be"); 1687 1688 // Get the return PC for the passed caller PC. 1689 address return_pc = caller_pc + frame::pc_return_offset; 1690 1691 // There is a benign race here. We could be attempting to patch to a compiled 1692 // entry point at the same time the callee is being deoptimized. If that is 1693 // the case then entry_point may in fact point to a c2i and we'd patch the 1694 // call site with the same old data. clear_code will set code() to NULL 1695 // at the end of it. If we happen to see that NULL then we can skip trying 1696 // to patch. If we hit the window where the callee has a c2i in the 1697 // from_compiled_entry and the NULL isn't present yet then we lose the race 1698 // and patch the code with the same old data. Asi es la vida. 1699 1700 if (moop->code() == NULL) return; 1701 1702 if (nm->is_in_use()) { 1703 1704 // Expect to find a native call there (unless it was no-inline cache vtable dispatch) 1705 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1706 if (NativeCall::is_call_before(return_pc)) { 1707 NativeCall *call = nativeCall_before(return_pc); 1708 // 1709 // bug 6281185. We might get here after resolving a call site to a vanilla 1710 // virtual call. Because the resolvee uses the verified entry it may then 1711 // see compiled code and attempt to patch the site by calling us. This would 1712 // then incorrectly convert the call site to optimized and its downhill from 1713 // there. If you're lucky you'll get the assert in the bugid, if not you've 1714 // just made a call site that could be megamorphic into a monomorphic site 1715 // for the rest of its life! Just another racing bug in the life of 1716 // fixup_callers_callsite ... 1717 // 1718 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address()); 1719 iter.next(); 1720 assert(iter.has_current(), "must have a reloc at java call site"); 1721 relocInfo::relocType typ = iter.reloc()->type(); 1722 if ( typ != relocInfo::static_call_type && 1723 typ != relocInfo::opt_virtual_call_type && 1724 typ != relocInfo::static_stub_type) { 1725 return; 1726 } 1727 address destination = call->destination(); 1728 if (destination != entry_point) { 1729 CodeBlob* callee = CodeCache::find_blob(destination); 1730 // callee == cb seems weird. It means calling interpreter thru stub. 1731 if (callee == cb || callee->is_adapter_blob()) { 1732 // static call or optimized virtual 1733 if (TraceCallFixup) { 1734 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); 1735 moop->print_short_name(tty); 1736 tty->print_cr(" to " INTPTR_FORMAT, entry_point); 1737 } 1738 call->set_destination_mt_safe(entry_point); 1739 } else { 1740 if (TraceCallFixup) { 1741 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); 1742 moop->print_short_name(tty); 1743 tty->print_cr(" to " INTPTR_FORMAT, entry_point); 1744 } 1745 // assert is too strong could also be resolve destinations. 1746 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be"); 1747 } 1748 } else { 1749 if (TraceCallFixup) { 1750 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); 1751 moop->print_short_name(tty); 1752 tty->print_cr(" to " INTPTR_FORMAT, entry_point); 1753 } 1754 } 1755 } 1756 } 1757 IRT_END 1758 1759 1760 // same as JVM_Arraycopy, but called directly from compiled code 1761 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos, 1762 oopDesc* dest, jint dest_pos, 1763 jint length, 1764 JavaThread* thread)) { 1765 #ifndef PRODUCT 1766 _slow_array_copy_ctr++; 1767 #endif 1768 // Check if we have null pointers 1769 if (src == NULL || dest == NULL) { 1770 THROW(vmSymbols::java_lang_NullPointerException()); 1771 } 1772 // Do the copy. The casts to arrayOop are necessary to the copy_array API, 1773 // even though the copy_array API also performs dynamic checks to ensure 1774 // that src and dest are truly arrays (and are conformable). 1775 // The copy_array mechanism is awkward and could be removed, but 1776 // the compilers don't call this function except as a last resort, 1777 // so it probably doesn't matter. 1778 src->klass()->copy_array((arrayOopDesc*)src, src_pos, 1779 (arrayOopDesc*)dest, dest_pos, 1780 length, thread); 1781 } 1782 JRT_END 1783 1784 char* SharedRuntime::generate_class_cast_message( 1785 JavaThread* thread, const char* objName) { 1786 1787 // Get target class name from the checkcast instruction 1788 vframeStream vfst(thread, true); 1789 assert(!vfst.at_end(), "Java frame must exist"); 1790 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci())); 1791 Klass* targetKlass = vfst.method()->constants()->klass_at( 1792 cc.index(), thread); 1793 return generate_class_cast_message(objName, targetKlass->external_name()); 1794 } 1795 1796 char* SharedRuntime::generate_class_cast_message( 1797 const char* objName, const char* targetKlassName, const char* desc) { 1798 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1; 1799 1800 char* message = NEW_RESOURCE_ARRAY(char, msglen); 1801 if (NULL == message) { 1802 // Shouldn't happen, but don't cause even more problems if it does 1803 message = const_cast<char*>(objName); 1804 } else { 1805 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName); 1806 } 1807 return message; 1808 } 1809 1810 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages()) 1811 (void) JavaThread::current()->reguard_stack(); 1812 JRT_END 1813 1814 1815 // Handles the uncommon case in locking, i.e., contention or an inflated lock. 1816 #ifndef PRODUCT 1817 int SharedRuntime::_monitor_enter_ctr=0; 1818 #endif 1819 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread)) 1820 oop obj(_obj); 1821 #ifndef PRODUCT 1822 _monitor_enter_ctr++; // monitor enter slow 1823 #endif 1824 if (PrintBiasedLockingStatistics) { 1825 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 1826 } 1827 Handle h_obj(THREAD, obj); 1828 if (UseBiasedLocking) { 1829 // Retry fast entry if bias is revoked to avoid unnecessary inflation 1830 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK); 1831 } else { 1832 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK); 1833 } 1834 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here"); 1835 JRT_END 1836 1837 #ifndef PRODUCT 1838 int SharedRuntime::_monitor_exit_ctr=0; 1839 #endif 1840 // Handles the uncommon cases of monitor unlocking in compiled code 1841 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock)) 1842 oop obj(_obj); 1843 #ifndef PRODUCT 1844 _monitor_exit_ctr++; // monitor exit slow 1845 #endif 1846 Thread* THREAD = JavaThread::current(); 1847 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore 1848 // testing was unable to ever fire the assert that guarded it so I have removed it. 1849 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?"); 1850 #undef MIGHT_HAVE_PENDING 1851 #ifdef MIGHT_HAVE_PENDING 1852 // Save and restore any pending_exception around the exception mark. 1853 // While the slow_exit must not throw an exception, we could come into 1854 // this routine with one set. 1855 oop pending_excep = NULL; 1856 const char* pending_file; 1857 int pending_line; 1858 if (HAS_PENDING_EXCEPTION) { 1859 pending_excep = PENDING_EXCEPTION; 1860 pending_file = THREAD->exception_file(); 1861 pending_line = THREAD->exception_line(); 1862 CLEAR_PENDING_EXCEPTION; 1863 } 1864 #endif /* MIGHT_HAVE_PENDING */ 1865 1866 { 1867 // Exit must be non-blocking, and therefore no exceptions can be thrown. 1868 EXCEPTION_MARK; 1869 ObjectSynchronizer::slow_exit(obj, lock, THREAD); 1870 } 1871 1872 #ifdef MIGHT_HAVE_PENDING 1873 if (pending_excep != NULL) { 1874 THREAD->set_pending_exception(pending_excep, pending_file, pending_line); 1875 } 1876 #endif /* MIGHT_HAVE_PENDING */ 1877 JRT_END 1878 1879 #ifndef PRODUCT 1880 1881 void SharedRuntime::print_statistics() { 1882 ttyLocker ttyl; 1883 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'"); 1884 1885 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr); 1886 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr); 1887 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr); 1888 1889 SharedRuntime::print_ic_miss_histogram(); 1890 1891 if (CountRemovableExceptions) { 1892 if (_nof_removable_exceptions > 0) { 1893 Unimplemented(); // this counter is not yet incremented 1894 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions); 1895 } 1896 } 1897 1898 // Dump the JRT_ENTRY counters 1899 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr); 1900 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr); 1901 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr); 1902 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr); 1903 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr); 1904 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr); 1905 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr); 1906 1907 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr ); 1908 tty->print_cr("%5d wrong method", _wrong_method_ctr ); 1909 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr ); 1910 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr ); 1911 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr ); 1912 1913 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr ); 1914 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr ); 1915 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr ); 1916 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr ); 1917 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr ); 1918 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr ); 1919 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr ); 1920 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr ); 1921 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr ); 1922 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr ); 1923 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr ); 1924 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr ); 1925 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr ); 1926 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr ); 1927 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr ); 1928 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr ); 1929 1930 AdapterHandlerLibrary::print_statistics(); 1931 1932 if (xtty != NULL) xtty->tail("statistics"); 1933 } 1934 1935 inline double percent(int x, int y) { 1936 return 100.0 * x / MAX2(y, 1); 1937 } 1938 1939 class MethodArityHistogram { 1940 public: 1941 enum { MAX_ARITY = 256 }; 1942 private: 1943 static int _arity_histogram[MAX_ARITY]; // histogram of #args 1944 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words 1945 static int _max_arity; // max. arity seen 1946 static int _max_size; // max. arg size seen 1947 1948 static void add_method_to_histogram(nmethod* nm) { 1949 Method* m = nm->method(); 1950 ArgumentCount args(m->signature()); 1951 int arity = args.size() + (m->is_static() ? 0 : 1); 1952 int argsize = m->size_of_parameters(); 1953 arity = MIN2(arity, MAX_ARITY-1); 1954 argsize = MIN2(argsize, MAX_ARITY-1); 1955 int count = nm->method()->compiled_invocation_count(); 1956 _arity_histogram[arity] += count; 1957 _size_histogram[argsize] += count; 1958 _max_arity = MAX2(_max_arity, arity); 1959 _max_size = MAX2(_max_size, argsize); 1960 } 1961 1962 void print_histogram_helper(int n, int* histo, const char* name) { 1963 const int N = MIN2(5, n); 1964 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 1965 double sum = 0; 1966 double weighted_sum = 0; 1967 int i; 1968 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; } 1969 double rest = sum; 1970 double percent = sum / 100; 1971 for (i = 0; i <= N; i++) { 1972 rest -= histo[i]; 1973 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent); 1974 } 1975 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent); 1976 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n); 1977 } 1978 1979 void print_histogram() { 1980 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 1981 print_histogram_helper(_max_arity, _arity_histogram, "arity"); 1982 tty->print_cr("\nSame for parameter size (in words):"); 1983 print_histogram_helper(_max_size, _size_histogram, "size"); 1984 tty->cr(); 1985 } 1986 1987 public: 1988 MethodArityHistogram() { 1989 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1990 _max_arity = _max_size = 0; 1991 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0; 1992 CodeCache::nmethods_do(add_method_to_histogram); 1993 print_histogram(); 1994 } 1995 }; 1996 1997 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY]; 1998 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY]; 1999 int MethodArityHistogram::_max_arity; 2000 int MethodArityHistogram::_max_size; 2001 2002 void SharedRuntime::print_call_statistics(int comp_total) { 2003 tty->print_cr("Calls from compiled code:"); 2004 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls; 2005 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls; 2006 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls; 2007 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total)); 2008 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total)); 2009 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls)); 2010 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls)); 2011 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls)); 2012 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls)); 2013 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total)); 2014 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls)); 2015 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls)); 2016 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls)); 2017 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls)); 2018 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total)); 2019 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls)); 2020 tty->cr(); 2021 tty->print_cr("Note 1: counter updates are not MT-safe."); 2022 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;"); 2023 tty->print_cr(" %% in nested categories are relative to their category"); 2024 tty->print_cr(" (and thus add up to more than 100%% with inlining)"); 2025 tty->cr(); 2026 2027 MethodArityHistogram h; 2028 } 2029 #endif 2030 2031 2032 // A simple wrapper class around the calling convention information 2033 // that allows sharing of adapters for the same calling convention. 2034 class AdapterFingerPrint : public CHeapObj<mtCode> { 2035 private: 2036 enum { 2037 _basic_type_bits = 4, 2038 _basic_type_mask = right_n_bits(_basic_type_bits), 2039 _basic_types_per_int = BitsPerInt / _basic_type_bits, 2040 _compact_int_count = 3 2041 }; 2042 // TO DO: Consider integrating this with a more global scheme for compressing signatures. 2043 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive. 2044 2045 union { 2046 int _compact[_compact_int_count]; 2047 int* _fingerprint; 2048 } _value; 2049 int _length; // A negative length indicates the fingerprint is in the compact form, 2050 // Otherwise _value._fingerprint is the array. 2051 2052 // Remap BasicTypes that are handled equivalently by the adapters. 2053 // These are correct for the current system but someday it might be 2054 // necessary to make this mapping platform dependent. 2055 static int adapter_encoding(BasicType in) { 2056 switch(in) { 2057 case T_BOOLEAN: 2058 case T_BYTE: 2059 case T_SHORT: 2060 case T_CHAR: 2061 // There are all promoted to T_INT in the calling convention 2062 return T_INT; 2063 2064 case T_OBJECT: 2065 case T_ARRAY: 2066 // In other words, we assume that any register good enough for 2067 // an int or long is good enough for a managed pointer. 2068 #ifdef _LP64 2069 return T_LONG; 2070 #else 2071 return T_INT; 2072 #endif 2073 2074 case T_INT: 2075 case T_LONG: 2076 case T_FLOAT: 2077 case T_DOUBLE: 2078 case T_VOID: 2079 return in; 2080 2081 default: 2082 ShouldNotReachHere(); 2083 return T_CONFLICT; 2084 } 2085 } 2086 2087 public: 2088 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) { 2089 // The fingerprint is based on the BasicType signature encoded 2090 // into an array of ints with eight entries per int. 2091 int* ptr; 2092 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int; 2093 if (len <= _compact_int_count) { 2094 assert(_compact_int_count == 3, "else change next line"); 2095 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0; 2096 // Storing the signature encoded as signed chars hits about 98% 2097 // of the time. 2098 _length = -len; 2099 ptr = _value._compact; 2100 } else { 2101 _length = len; 2102 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode); 2103 ptr = _value._fingerprint; 2104 } 2105 2106 // Now pack the BasicTypes with 8 per int 2107 int sig_index = 0; 2108 for (int index = 0; index < len; index++) { 2109 int value = 0; 2110 for (int byte = 0; byte < _basic_types_per_int; byte++) { 2111 int bt = ((sig_index < total_args_passed) 2112 ? adapter_encoding(sig_bt[sig_index++]) 2113 : 0); 2114 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits"); 2115 value = (value << _basic_type_bits) | bt; 2116 } 2117 ptr[index] = value; 2118 } 2119 } 2120 2121 ~AdapterFingerPrint() { 2122 if (_length > 0) { 2123 FREE_C_HEAP_ARRAY(int, _value._fingerprint, mtCode); 2124 } 2125 } 2126 2127 int value(int index) { 2128 if (_length < 0) { 2129 return _value._compact[index]; 2130 } 2131 return _value._fingerprint[index]; 2132 } 2133 int length() { 2134 if (_length < 0) return -_length; 2135 return _length; 2136 } 2137 2138 bool is_compact() { 2139 return _length <= 0; 2140 } 2141 2142 unsigned int compute_hash() { 2143 int hash = 0; 2144 for (int i = 0; i < length(); i++) { 2145 int v = value(i); 2146 hash = (hash << 8) ^ v ^ (hash >> 5); 2147 } 2148 return (unsigned int)hash; 2149 } 2150 2151 const char* as_string() { 2152 stringStream st; 2153 st.print("0x"); 2154 for (int i = 0; i < length(); i++) { 2155 st.print("%08x", value(i)); 2156 } 2157 return st.as_string(); 2158 } 2159 2160 bool equals(AdapterFingerPrint* other) { 2161 if (other->_length != _length) { 2162 return false; 2163 } 2164 if (_length < 0) { 2165 assert(_compact_int_count == 3, "else change next line"); 2166 return _value._compact[0] == other->_value._compact[0] && 2167 _value._compact[1] == other->_value._compact[1] && 2168 _value._compact[2] == other->_value._compact[2]; 2169 } else { 2170 for (int i = 0; i < _length; i++) { 2171 if (_value._fingerprint[i] != other->_value._fingerprint[i]) { 2172 return false; 2173 } 2174 } 2175 } 2176 return true; 2177 } 2178 }; 2179 2180 2181 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries 2182 class AdapterHandlerTable : public BasicHashtable<mtCode> { 2183 friend class AdapterHandlerTableIterator; 2184 2185 private: 2186 2187 #ifndef PRODUCT 2188 static int _lookups; // number of calls to lookup 2189 static int _buckets; // number of buckets checked 2190 static int _equals; // number of buckets checked with matching hash 2191 static int _hits; // number of successful lookups 2192 static int _compact; // number of equals calls with compact signature 2193 #endif 2194 2195 AdapterHandlerEntry* bucket(int i) { 2196 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i); 2197 } 2198 2199 public: 2200 AdapterHandlerTable() 2201 : BasicHashtable<mtCode>(293, sizeof(AdapterHandlerEntry)) { } 2202 2203 // Create a new entry suitable for insertion in the table 2204 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 2205 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash()); 2206 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2207 return entry; 2208 } 2209 2210 // Insert an entry into the table 2211 void add(AdapterHandlerEntry* entry) { 2212 int index = hash_to_index(entry->hash()); 2213 add_entry(index, entry); 2214 } 2215 2216 void free_entry(AdapterHandlerEntry* entry) { 2217 entry->deallocate(); 2218 BasicHashtable<mtCode>::free_entry(entry); 2219 } 2220 2221 // Find a entry with the same fingerprint if it exists 2222 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) { 2223 NOT_PRODUCT(_lookups++); 2224 AdapterFingerPrint fp(total_args_passed, sig_bt); 2225 unsigned int hash = fp.compute_hash(); 2226 int index = hash_to_index(hash); 2227 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2228 NOT_PRODUCT(_buckets++); 2229 if (e->hash() == hash) { 2230 NOT_PRODUCT(_equals++); 2231 if (fp.equals(e->fingerprint())) { 2232 #ifndef PRODUCT 2233 if (fp.is_compact()) _compact++; 2234 _hits++; 2235 #endif 2236 return e; 2237 } 2238 } 2239 } 2240 return NULL; 2241 } 2242 2243 #ifndef PRODUCT 2244 void print_statistics() { 2245 ResourceMark rm; 2246 int longest = 0; 2247 int empty = 0; 2248 int total = 0; 2249 int nonempty = 0; 2250 for (int index = 0; index < table_size(); index++) { 2251 int count = 0; 2252 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 2253 count++; 2254 } 2255 if (count != 0) nonempty++; 2256 if (count == 0) empty++; 2257 if (count > longest) longest = count; 2258 total += count; 2259 } 2260 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f", 2261 empty, longest, total, total / (double)nonempty); 2262 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d", 2263 _lookups, _buckets, _equals, _hits, _compact); 2264 } 2265 #endif 2266 }; 2267 2268 2269 #ifndef PRODUCT 2270 2271 int AdapterHandlerTable::_lookups; 2272 int AdapterHandlerTable::_buckets; 2273 int AdapterHandlerTable::_equals; 2274 int AdapterHandlerTable::_hits; 2275 int AdapterHandlerTable::_compact; 2276 2277 #endif 2278 2279 class AdapterHandlerTableIterator : public StackObj { 2280 private: 2281 AdapterHandlerTable* _table; 2282 int _index; 2283 AdapterHandlerEntry* _current; 2284 2285 void scan() { 2286 while (_index < _table->table_size()) { 2287 AdapterHandlerEntry* a = _table->bucket(_index); 2288 _index++; 2289 if (a != NULL) { 2290 _current = a; 2291 return; 2292 } 2293 } 2294 } 2295 2296 public: 2297 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) { 2298 scan(); 2299 } 2300 bool has_next() { 2301 return _current != NULL; 2302 } 2303 AdapterHandlerEntry* next() { 2304 if (_current != NULL) { 2305 AdapterHandlerEntry* result = _current; 2306 _current = _current->next(); 2307 if (_current == NULL) scan(); 2308 return result; 2309 } else { 2310 return NULL; 2311 } 2312 } 2313 }; 2314 2315 2316 // --------------------------------------------------------------------------- 2317 // Implementation of AdapterHandlerLibrary 2318 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL; 2319 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL; 2320 const int AdapterHandlerLibrary_size = 16*K; 2321 BufferBlob* AdapterHandlerLibrary::_buffer = NULL; 2322 2323 BufferBlob* AdapterHandlerLibrary::buffer_blob() { 2324 // Should be called only when AdapterHandlerLibrary_lock is active. 2325 if (_buffer == NULL) // Initialize lazily 2326 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size); 2327 return _buffer; 2328 } 2329 2330 void AdapterHandlerLibrary::initialize() { 2331 if (_adapters != NULL) return; 2332 _adapters = new AdapterHandlerTable(); 2333 2334 // Create a special handler for abstract methods. Abstract methods 2335 // are never compiled so an i2c entry is somewhat meaningless, but 2336 // fill it in with something appropriate just in case. Pass handle 2337 // wrong method for the c2i transitions. 2338 address wrong_method = SharedRuntime::get_handle_wrong_method_stub(); 2339 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL), 2340 StubRoutines::throw_AbstractMethodError_entry(), 2341 wrong_method, wrong_method); 2342 } 2343 2344 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint, 2345 address i2c_entry, 2346 address c2i_entry, 2347 address c2i_unverified_entry) { 2348 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2349 } 2350 2351 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(methodHandle method) { 2352 // Use customized signature handler. Need to lock around updates to 2353 // the AdapterHandlerTable (it is not safe for concurrent readers 2354 // and a single writer: this could be fixed if it becomes a 2355 // problem). 2356 2357 // Get the address of the ic_miss handlers before we grab the 2358 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which 2359 // was caused by the initialization of the stubs happening 2360 // while we held the lock and then notifying jvmti while 2361 // holding it. This just forces the initialization to be a little 2362 // earlier. 2363 address ic_miss = SharedRuntime::get_ic_miss_stub(); 2364 assert(ic_miss != NULL, "must have handler"); 2365 2366 ResourceMark rm; 2367 2368 NOT_PRODUCT(int insts_size); 2369 AdapterBlob* B = NULL; 2370 AdapterHandlerEntry* entry = NULL; 2371 AdapterFingerPrint* fingerprint = NULL; 2372 { 2373 MutexLocker mu(AdapterHandlerLibrary_lock); 2374 // make sure data structure is initialized 2375 initialize(); 2376 2377 if (method->is_abstract()) { 2378 return _abstract_method_handler; 2379 } 2380 2381 // Fill in the signature array, for the calling-convention call. 2382 int total_args_passed = method->size_of_parameters(); // All args on stack 2383 2384 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2385 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2386 int i = 0; 2387 if (!method->is_static()) // Pass in receiver first 2388 sig_bt[i++] = T_OBJECT; 2389 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) { 2390 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2391 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2392 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2393 } 2394 assert(i == total_args_passed, ""); 2395 2396 // Lookup method signature's fingerprint 2397 entry = _adapters->lookup(total_args_passed, sig_bt); 2398 2399 #ifdef ASSERT 2400 AdapterHandlerEntry* shared_entry = NULL; 2401 if (VerifyAdapterSharing && entry != NULL) { 2402 shared_entry = entry; 2403 entry = NULL; 2404 } 2405 #endif 2406 2407 if (entry != NULL) { 2408 return entry; 2409 } 2410 2411 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage 2412 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); 2413 2414 // Make a C heap allocated version of the fingerprint to store in the adapter 2415 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt); 2416 2417 // Create I2C & C2I handlers 2418 2419 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2420 if (buf != NULL) { 2421 CodeBuffer buffer(buf); 2422 short buffer_locs[20]; 2423 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs, 2424 sizeof(buffer_locs)/sizeof(relocInfo)); 2425 MacroAssembler _masm(&buffer); 2426 2427 entry = SharedRuntime::generate_i2c2i_adapters(&_masm, 2428 total_args_passed, 2429 comp_args_on_stack, 2430 sig_bt, 2431 regs, 2432 fingerprint); 2433 2434 #ifdef ASSERT 2435 if (VerifyAdapterSharing) { 2436 if (shared_entry != NULL) { 2437 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size(), total_args_passed, sig_bt), 2438 "code must match"); 2439 // Release the one just created and return the original 2440 _adapters->free_entry(entry); 2441 return shared_entry; 2442 } else { 2443 entry->save_code(buf->code_begin(), buffer.insts_size(), total_args_passed, sig_bt); 2444 } 2445 } 2446 #endif 2447 2448 B = AdapterBlob::create(&buffer); 2449 NOT_PRODUCT(insts_size = buffer.insts_size()); 2450 } 2451 if (B == NULL) { 2452 // CodeCache is full, disable compilation 2453 // Ought to log this but compile log is only per compile thread 2454 // and we're some non descript Java thread. 2455 MutexUnlocker mu(AdapterHandlerLibrary_lock); 2456 CompileBroker::handle_full_code_cache(); 2457 return NULL; // Out of CodeCache space 2458 } 2459 entry->relocate(B->content_begin()); 2460 #ifndef PRODUCT 2461 // debugging suppport 2462 if (PrintAdapterHandlers || PrintStubCode) { 2463 ttyLocker ttyl; 2464 entry->print_adapter_on(tty); 2465 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)", 2466 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"), 2467 method->signature()->as_C_string(), insts_size); 2468 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry()); 2469 if (Verbose || PrintStubCode) { 2470 address first_pc = entry->base_address(); 2471 if (first_pc != NULL) { 2472 Disassembler::decode(first_pc, first_pc + insts_size); 2473 tty->cr(); 2474 } 2475 } 2476 } 2477 #endif 2478 2479 _adapters->add(entry); 2480 } 2481 // Outside of the lock 2482 if (B != NULL) { 2483 char blob_id[256]; 2484 jio_snprintf(blob_id, 2485 sizeof(blob_id), 2486 "%s(%s)@" PTR_FORMAT, 2487 B->name(), 2488 fingerprint->as_string(), 2489 B->content_begin()); 2490 Forte::register_stub(blob_id, B->content_begin(), B->content_end()); 2491 2492 if (JvmtiExport::should_post_dynamic_code_generated()) { 2493 JvmtiExport::post_dynamic_code_generated(blob_id, B->content_begin(), B->content_end()); 2494 } 2495 } 2496 return entry; 2497 } 2498 2499 address AdapterHandlerEntry::base_address() { 2500 address base = _i2c_entry; 2501 if (base == NULL) base = _c2i_entry; 2502 assert(base <= _c2i_entry || _c2i_entry == NULL, ""); 2503 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, ""); 2504 return base; 2505 } 2506 2507 void AdapterHandlerEntry::relocate(address new_base) { 2508 address old_base = base_address(); 2509 assert(old_base != NULL, ""); 2510 ptrdiff_t delta = new_base - old_base; 2511 if (_i2c_entry != NULL) 2512 _i2c_entry += delta; 2513 if (_c2i_entry != NULL) 2514 _c2i_entry += delta; 2515 if (_c2i_unverified_entry != NULL) 2516 _c2i_unverified_entry += delta; 2517 assert(base_address() == new_base, ""); 2518 } 2519 2520 2521 void AdapterHandlerEntry::deallocate() { 2522 delete _fingerprint; 2523 #ifdef ASSERT 2524 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code, mtCode); 2525 if (_saved_sig) FREE_C_HEAP_ARRAY(Basictype, _saved_sig, mtCode); 2526 #endif 2527 } 2528 2529 2530 #ifdef ASSERT 2531 // Capture the code before relocation so that it can be compared 2532 // against other versions. If the code is captured after relocation 2533 // then relative instructions won't be equivalent. 2534 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) { 2535 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode); 2536 _code_length = length; 2537 memcpy(_saved_code, buffer, length); 2538 _total_args_passed = total_args_passed; 2539 _saved_sig = NEW_C_HEAP_ARRAY(BasicType, _total_args_passed, mtCode); 2540 memcpy(_saved_sig, sig_bt, _total_args_passed * sizeof(BasicType)); 2541 } 2542 2543 2544 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) { 2545 if (length != _code_length) { 2546 return false; 2547 } 2548 for (int i = 0; i < length; i++) { 2549 if (buffer[i] != _saved_code[i]) { 2550 return false; 2551 } 2552 } 2553 return true; 2554 } 2555 #endif 2556 2557 2558 // Create a native wrapper for this native method. The wrapper converts the 2559 // java compiled calling convention to the native convention, handlizes 2560 // arguments, and transitions to native. On return from the native we transition 2561 // back to java blocking if a safepoint is in progress. 2562 nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method, int compile_id) { 2563 ResourceMark rm; 2564 nmethod* nm = NULL; 2565 2566 assert(method->is_native(), "must be native"); 2567 assert(method->is_method_handle_intrinsic() || 2568 method->has_native_function(), "must have something valid to call!"); 2569 2570 { 2571 // perform the work while holding the lock, but perform any printing outside the lock 2572 MutexLocker mu(AdapterHandlerLibrary_lock); 2573 // See if somebody beat us to it 2574 nm = method->code(); 2575 if (nm) { 2576 return nm; 2577 } 2578 2579 ResourceMark rm; 2580 2581 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2582 if (buf != NULL) { 2583 CodeBuffer buffer(buf); 2584 double locs_buf[20]; 2585 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); 2586 MacroAssembler _masm(&buffer); 2587 2588 // Fill in the signature array, for the calling-convention call. 2589 const int total_args_passed = method->size_of_parameters(); 2590 2591 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2592 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2593 int i=0; 2594 if( !method->is_static() ) // Pass in receiver first 2595 sig_bt[i++] = T_OBJECT; 2596 SignatureStream ss(method->signature()); 2597 for( ; !ss.at_return_type(); ss.next()) { 2598 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2599 if( ss.type() == T_LONG || ss.type() == T_DOUBLE ) 2600 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2601 } 2602 assert(i == total_args_passed, ""); 2603 BasicType ret_type = ss.type(); 2604 2605 // Now get the compiled-Java layout as input (or output) arguments. 2606 // NOTE: Stubs for compiled entry points of method handle intrinsics 2607 // are just trampolines so the argument registers must be outgoing ones. 2608 const bool is_outgoing = method->is_method_handle_intrinsic(); 2609 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing); 2610 2611 // Generate the compiled-to-native wrapper code 2612 nm = SharedRuntime::generate_native_wrapper(&_masm, 2613 method, 2614 compile_id, 2615 sig_bt, 2616 regs, 2617 ret_type); 2618 } 2619 } 2620 2621 // Must unlock before calling set_code 2622 2623 // Install the generated code. 2624 if (nm != NULL) { 2625 if (PrintCompilation) { 2626 ttyLocker ttyl; 2627 CompileTask::print_compilation(tty, nm, method->is_static() ? "(static)" : ""); 2628 } 2629 method->set_code(method, nm); 2630 nm->post_compiled_method_load_event(); 2631 } else { 2632 // CodeCache is full, disable compilation 2633 CompileBroker::handle_full_code_cache(); 2634 } 2635 return nm; 2636 } 2637 2638 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread)) 2639 assert(thread == JavaThread::current(), "must be"); 2640 // The code is about to enter a JNI lazy critical native method and 2641 // _needs_gc is true, so if this thread is already in a critical 2642 // section then just return, otherwise this thread should block 2643 // until needs_gc has been cleared. 2644 if (thread->in_critical()) { 2645 return; 2646 } 2647 // Lock and unlock a critical section to give the system a chance to block 2648 GC_locker::lock_critical(thread); 2649 GC_locker::unlock_critical(thread); 2650 JRT_END 2651 2652 #ifdef HAVE_DTRACE_H 2653 // Create a dtrace nmethod for this method. The wrapper converts the 2654 // java compiled calling convention to the native convention, makes a dummy call 2655 // (actually nops for the size of the call instruction, which become a trap if 2656 // probe is enabled). The returns to the caller. Since this all looks like a 2657 // leaf no thread transition is needed. 2658 2659 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) { 2660 ResourceMark rm; 2661 nmethod* nm = NULL; 2662 2663 if (PrintCompilation) { 2664 ttyLocker ttyl; 2665 tty->print("--- n%s "); 2666 method->print_short_name(tty); 2667 if (method->is_static()) { 2668 tty->print(" (static)"); 2669 } 2670 tty->cr(); 2671 } 2672 2673 { 2674 // perform the work while holding the lock, but perform any printing 2675 // outside the lock 2676 MutexLocker mu(AdapterHandlerLibrary_lock); 2677 // See if somebody beat us to it 2678 nm = method->code(); 2679 if (nm) { 2680 return nm; 2681 } 2682 2683 ResourceMark rm; 2684 2685 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2686 if (buf != NULL) { 2687 CodeBuffer buffer(buf); 2688 // Need a few relocation entries 2689 double locs_buf[20]; 2690 buffer.insts()->initialize_shared_locs( 2691 (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); 2692 MacroAssembler _masm(&buffer); 2693 2694 // Generate the compiled-to-native wrapper code 2695 nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method); 2696 } 2697 } 2698 return nm; 2699 } 2700 2701 // the dtrace method needs to convert java lang string to utf8 string. 2702 void SharedRuntime::get_utf(oopDesc* src, address dst) { 2703 typeArrayOop jlsValue = java_lang_String::value(src); 2704 int jlsOffset = java_lang_String::offset(src); 2705 int jlsLen = java_lang_String::length(src); 2706 jchar* jlsPos = (jlsLen == 0) ? NULL : 2707 jlsValue->char_at_addr(jlsOffset); 2708 assert(TypeArrayKlass::cast(jlsValue->klass())->element_type() == T_CHAR, "compressed string"); 2709 (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size); 2710 } 2711 #endif // ndef HAVE_DTRACE_H 2712 2713 // ------------------------------------------------------------------------- 2714 // Java-Java calling convention 2715 // (what you use when Java calls Java) 2716 2717 //------------------------------name_for_receiver---------------------------------- 2718 // For a given signature, return the VMReg for parameter 0. 2719 VMReg SharedRuntime::name_for_receiver() { 2720 VMRegPair regs; 2721 BasicType sig_bt = T_OBJECT; 2722 (void) java_calling_convention(&sig_bt, ®s, 1, true); 2723 // Return argument 0 register. In the LP64 build pointers 2724 // take 2 registers, but the VM wants only the 'main' name. 2725 return regs.first(); 2726 } 2727 2728 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, int* arg_size) { 2729 // This method is returning a data structure allocating as a 2730 // ResourceObject, so do not put any ResourceMarks in here. 2731 char *s = sig->as_C_string(); 2732 int len = (int)strlen(s); 2733 *s++; len--; // Skip opening paren 2734 char *t = s+len; 2735 while( *(--t) != ')' ) ; // Find close paren 2736 2737 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 ); 2738 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 ); 2739 int cnt = 0; 2740 if (has_receiver) { 2741 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature 2742 } 2743 2744 while( s < t ) { 2745 switch( *s++ ) { // Switch on signature character 2746 case 'B': sig_bt[cnt++] = T_BYTE; break; 2747 case 'C': sig_bt[cnt++] = T_CHAR; break; 2748 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break; 2749 case 'F': sig_bt[cnt++] = T_FLOAT; break; 2750 case 'I': sig_bt[cnt++] = T_INT; break; 2751 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break; 2752 case 'S': sig_bt[cnt++] = T_SHORT; break; 2753 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break; 2754 case 'V': sig_bt[cnt++] = T_VOID; break; 2755 case 'L': // Oop 2756 while( *s++ != ';' ) ; // Skip signature 2757 sig_bt[cnt++] = T_OBJECT; 2758 break; 2759 case '[': { // Array 2760 do { // Skip optional size 2761 while( *s >= '0' && *s <= '9' ) s++; 2762 } while( *s++ == '[' ); // Nested arrays? 2763 // Skip element type 2764 if( s[-1] == 'L' ) 2765 while( *s++ != ';' ) ; // Skip signature 2766 sig_bt[cnt++] = T_ARRAY; 2767 break; 2768 } 2769 default : ShouldNotReachHere(); 2770 } 2771 } 2772 assert( cnt < 256, "grow table size" ); 2773 2774 int comp_args_on_stack; 2775 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true); 2776 2777 // the calling convention doesn't count out_preserve_stack_slots so 2778 // we must add that in to get "true" stack offsets. 2779 2780 if (comp_args_on_stack) { 2781 for (int i = 0; i < cnt; i++) { 2782 VMReg reg1 = regs[i].first(); 2783 if( reg1->is_stack()) { 2784 // Yuck 2785 reg1 = reg1->bias(out_preserve_stack_slots()); 2786 } 2787 VMReg reg2 = regs[i].second(); 2788 if( reg2->is_stack()) { 2789 // Yuck 2790 reg2 = reg2->bias(out_preserve_stack_slots()); 2791 } 2792 regs[i].set_pair(reg2, reg1); 2793 } 2794 } 2795 2796 // results 2797 *arg_size = cnt; 2798 return regs; 2799 } 2800 2801 // OSR Migration Code 2802 // 2803 // This code is used convert interpreter frames into compiled frames. It is 2804 // called from very start of a compiled OSR nmethod. A temp array is 2805 // allocated to hold the interesting bits of the interpreter frame. All 2806 // active locks are inflated to allow them to move. The displaced headers and 2807 // active interpeter locals are copied into the temp buffer. Then we return 2808 // back to the compiled code. The compiled code then pops the current 2809 // interpreter frame off the stack and pushes a new compiled frame. Then it 2810 // copies the interpreter locals and displaced headers where it wants. 2811 // Finally it calls back to free the temp buffer. 2812 // 2813 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed. 2814 2815 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) ) 2816 2817 #ifdef IA64 2818 ShouldNotReachHere(); // NYI 2819 #endif /* IA64 */ 2820 2821 // 2822 // This code is dependent on the memory layout of the interpreter local 2823 // array and the monitors. On all of our platforms the layout is identical 2824 // so this code is shared. If some platform lays the their arrays out 2825 // differently then this code could move to platform specific code or 2826 // the code here could be modified to copy items one at a time using 2827 // frame accessor methods and be platform independent. 2828 2829 frame fr = thread->last_frame(); 2830 assert( fr.is_interpreted_frame(), "" ); 2831 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" ); 2832 2833 // Figure out how many monitors are active. 2834 int active_monitor_count = 0; 2835 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 2836 kptr < fr.interpreter_frame_monitor_begin(); 2837 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 2838 if( kptr->obj() != NULL ) active_monitor_count++; 2839 } 2840 2841 // QQQ we could place number of active monitors in the array so that compiled code 2842 // could double check it. 2843 2844 Method* moop = fr.interpreter_frame_method(); 2845 int max_locals = moop->max_locals(); 2846 // Allocate temp buffer, 1 word per local & 2 per active monitor 2847 int buf_size_words = max_locals + active_monitor_count*2; 2848 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode); 2849 2850 // Copy the locals. Order is preserved so that loading of longs works. 2851 // Since there's no GC I can copy the oops blindly. 2852 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code"); 2853 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1), 2854 (HeapWord*)&buf[0], 2855 max_locals); 2856 2857 // Inflate locks. Copy the displaced headers. Be careful, there can be holes. 2858 int i = max_locals; 2859 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end(); 2860 kptr2 < fr.interpreter_frame_monitor_begin(); 2861 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) { 2862 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array 2863 BasicLock *lock = kptr2->lock(); 2864 // Inflate so the displaced header becomes position-independent 2865 if (lock->displaced_header()->is_unlocked()) 2866 ObjectSynchronizer::inflate_helper(kptr2->obj()); 2867 // Now the displaced header is free to move 2868 buf[i++] = (intptr_t)lock->displaced_header(); 2869 buf[i++] = (intptr_t)kptr2->obj(); 2870 } 2871 } 2872 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" ); 2873 2874 return buf; 2875 JRT_END 2876 2877 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) ) 2878 FREE_C_HEAP_ARRAY(intptr_t,buf, mtCode); 2879 JRT_END 2880 2881 bool AdapterHandlerLibrary::contains(CodeBlob* b) { 2882 AdapterHandlerTableIterator iter(_adapters); 2883 while (iter.has_next()) { 2884 AdapterHandlerEntry* a = iter.next(); 2885 if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) return true; 2886 } 2887 return false; 2888 } 2889 2890 void AdapterHandlerLibrary::print_handler_on(outputStream* st, CodeBlob* b) { 2891 AdapterHandlerTableIterator iter(_adapters); 2892 while (iter.has_next()) { 2893 AdapterHandlerEntry* a = iter.next(); 2894 if (b == CodeCache::find_blob(a->get_i2c_entry())) { 2895 st->print("Adapter for signature: "); 2896 a->print_adapter_on(tty); 2897 return; 2898 } 2899 } 2900 assert(false, "Should have found handler"); 2901 } 2902 2903 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const { 2904 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT, 2905 (intptr_t) this, fingerprint()->as_string(), 2906 get_i2c_entry(), get_c2i_entry(), get_c2i_unverified_entry()); 2907 2908 } 2909 2910 #ifndef PRODUCT 2911 2912 void AdapterHandlerLibrary::print_statistics() { 2913 _adapters->print_statistics(); 2914 } 2915 2916 #endif /* PRODUCT */