1 /* 2 * Copyright 1997-2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_sharedRuntime.cpp.incl" 27 #include <math.h> 28 29 HS_DTRACE_PROBE_DECL4(hotspot, object__alloc, Thread*, char*, int, size_t); 30 HS_DTRACE_PROBE_DECL7(hotspot, method__entry, int, 31 char*, int, char*, int, char*, int); 32 HS_DTRACE_PROBE_DECL7(hotspot, method__return, int, 33 char*, int, char*, int, char*, int); 34 35 // Implementation of SharedRuntime 36 37 #ifndef PRODUCT 38 // For statistics 39 int SharedRuntime::_ic_miss_ctr = 0; 40 int SharedRuntime::_wrong_method_ctr = 0; 41 int SharedRuntime::_resolve_static_ctr = 0; 42 int SharedRuntime::_resolve_virtual_ctr = 0; 43 int SharedRuntime::_resolve_opt_virtual_ctr = 0; 44 int SharedRuntime::_implicit_null_throws = 0; 45 int SharedRuntime::_implicit_div0_throws = 0; 46 int SharedRuntime::_throw_null_ctr = 0; 47 48 int SharedRuntime::_nof_normal_calls = 0; 49 int SharedRuntime::_nof_optimized_calls = 0; 50 int SharedRuntime::_nof_inlined_calls = 0; 51 int SharedRuntime::_nof_megamorphic_calls = 0; 52 int SharedRuntime::_nof_static_calls = 0; 53 int SharedRuntime::_nof_inlined_static_calls = 0; 54 int SharedRuntime::_nof_interface_calls = 0; 55 int SharedRuntime::_nof_optimized_interface_calls = 0; 56 int SharedRuntime::_nof_inlined_interface_calls = 0; 57 int SharedRuntime::_nof_megamorphic_interface_calls = 0; 58 int SharedRuntime::_nof_removable_exceptions = 0; 59 60 int SharedRuntime::_new_instance_ctr=0; 61 int SharedRuntime::_new_array_ctr=0; 62 int SharedRuntime::_multi1_ctr=0; 63 int SharedRuntime::_multi2_ctr=0; 64 int SharedRuntime::_multi3_ctr=0; 65 int SharedRuntime::_multi4_ctr=0; 66 int SharedRuntime::_multi5_ctr=0; 67 int SharedRuntime::_mon_enter_stub_ctr=0; 68 int SharedRuntime::_mon_exit_stub_ctr=0; 69 int SharedRuntime::_mon_enter_ctr=0; 70 int SharedRuntime::_mon_exit_ctr=0; 71 int SharedRuntime::_partial_subtype_ctr=0; 72 int SharedRuntime::_jbyte_array_copy_ctr=0; 73 int SharedRuntime::_jshort_array_copy_ctr=0; 74 int SharedRuntime::_jint_array_copy_ctr=0; 75 int SharedRuntime::_jlong_array_copy_ctr=0; 76 int SharedRuntime::_oop_array_copy_ctr=0; 77 int SharedRuntime::_checkcast_array_copy_ctr=0; 78 int SharedRuntime::_unsafe_array_copy_ctr=0; 79 int SharedRuntime::_generic_array_copy_ctr=0; 80 int SharedRuntime::_slow_array_copy_ctr=0; 81 int SharedRuntime::_find_handler_ctr=0; 82 int SharedRuntime::_rethrow_ctr=0; 83 84 int SharedRuntime::_ICmiss_index = 0; 85 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count]; 86 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count]; 87 88 void SharedRuntime::trace_ic_miss(address at) { 89 for (int i = 0; i < _ICmiss_index; i++) { 90 if (_ICmiss_at[i] == at) { 91 _ICmiss_count[i]++; 92 return; 93 } 94 } 95 int index = _ICmiss_index++; 96 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1; 97 _ICmiss_at[index] = at; 98 _ICmiss_count[index] = 1; 99 } 100 101 void SharedRuntime::print_ic_miss_histogram() { 102 if (ICMissHistogram) { 103 tty->print_cr ("IC Miss Histogram:"); 104 int tot_misses = 0; 105 for (int i = 0; i < _ICmiss_index; i++) { 106 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", _ICmiss_at[i], _ICmiss_count[i]); 107 tot_misses += _ICmiss_count[i]; 108 } 109 tty->print_cr ("Total IC misses: %7d", tot_misses); 110 } 111 } 112 #endif // PRODUCT 113 114 #ifndef SERIALGC 115 116 // G1 write-barrier pre: executed before a pointer store. 117 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread)) 118 if (orig == NULL) { 119 assert(false, "should be optimized out"); 120 return; 121 } 122 assert(orig->is_oop(true /* ignore mark word */), "Error"); 123 // store the original value that was in the field reference 124 thread->satb_mark_queue().enqueue(orig); 125 JRT_END 126 127 // G1 write-barrier post: executed after a pointer store. 128 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread)) 129 thread->dirty_card_queue().enqueue(card_addr); 130 JRT_END 131 132 #endif // !SERIALGC 133 134 135 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x)) 136 return x * y; 137 JRT_END 138 139 140 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x)) 141 if (x == min_jlong && y == CONST64(-1)) { 142 return x; 143 } else { 144 return x / y; 145 } 146 JRT_END 147 148 149 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x)) 150 if (x == min_jlong && y == CONST64(-1)) { 151 return 0; 152 } else { 153 return x % y; 154 } 155 JRT_END 156 157 158 const juint float_sign_mask = 0x7FFFFFFF; 159 const juint float_infinity = 0x7F800000; 160 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF); 161 const julong double_infinity = CONST64(0x7FF0000000000000); 162 163 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y)) 164 #ifdef _WIN64 165 // 64-bit Windows on amd64 returns the wrong values for 166 // infinity operands. 167 union { jfloat f; juint i; } xbits, ybits; 168 xbits.f = x; 169 ybits.f = y; 170 // x Mod Infinity == x unless x is infinity 171 if ( ((xbits.i & float_sign_mask) != float_infinity) && 172 ((ybits.i & float_sign_mask) == float_infinity) ) { 173 return x; 174 } 175 #endif 176 return ((jfloat)fmod((double)x,(double)y)); 177 JRT_END 178 179 180 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y)) 181 #ifdef _WIN64 182 union { jdouble d; julong l; } xbits, ybits; 183 xbits.d = x; 184 ybits.d = y; 185 // x Mod Infinity == x unless x is infinity 186 if ( ((xbits.l & double_sign_mask) != double_infinity) && 187 ((ybits.l & double_sign_mask) == double_infinity) ) { 188 return x; 189 } 190 #endif 191 return ((jdouble)fmod((double)x,(double)y)); 192 JRT_END 193 194 195 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x)) 196 if (g_isnan(x)) 197 return 0; 198 if (x >= (jfloat) max_jint) 199 return max_jint; 200 if (x <= (jfloat) min_jint) 201 return min_jint; 202 return (jint) x; 203 JRT_END 204 205 206 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x)) 207 if (g_isnan(x)) 208 return 0; 209 if (x >= (jfloat) max_jlong) 210 return max_jlong; 211 if (x <= (jfloat) min_jlong) 212 return min_jlong; 213 return (jlong) x; 214 JRT_END 215 216 217 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x)) 218 if (g_isnan(x)) 219 return 0; 220 if (x >= (jdouble) max_jint) 221 return max_jint; 222 if (x <= (jdouble) min_jint) 223 return min_jint; 224 return (jint) x; 225 JRT_END 226 227 228 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x)) 229 if (g_isnan(x)) 230 return 0; 231 if (x >= (jdouble) max_jlong) 232 return max_jlong; 233 if (x <= (jdouble) min_jlong) 234 return min_jlong; 235 return (jlong) x; 236 JRT_END 237 238 239 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x)) 240 return (jfloat)x; 241 JRT_END 242 243 244 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x)) 245 return (jfloat)x; 246 JRT_END 247 248 249 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x)) 250 return (jdouble)x; 251 JRT_END 252 253 // Exception handling accross interpreter/compiler boundaries 254 // 255 // exception_handler_for_return_address(...) returns the continuation address. 256 // The continuation address is the entry point of the exception handler of the 257 // previous frame depending on the return address. 258 259 address SharedRuntime::raw_exception_handler_for_return_address(address return_address) { 260 assert(frame::verify_return_pc(return_address), "must be a return pc"); 261 262 // the fastest case first 263 CodeBlob* blob = CodeCache::find_blob(return_address); 264 if (blob != NULL && blob->is_nmethod()) { 265 nmethod* code = (nmethod*)blob; 266 assert(code != NULL, "nmethod must be present"); 267 // native nmethods don't have exception handlers 268 assert(!code->is_native_method(), "no exception handler"); 269 assert(code->header_begin() != code->exception_begin(), "no exception handler"); 270 if (code->is_deopt_pc(return_address)) { 271 return SharedRuntime::deopt_blob()->unpack_with_exception(); 272 } else { 273 return code->exception_begin(); 274 } 275 } 276 277 // Entry code 278 if (StubRoutines::returns_to_call_stub(return_address)) { 279 return StubRoutines::catch_exception_entry(); 280 } 281 // Interpreted code 282 if (Interpreter::contains(return_address)) { 283 return Interpreter::rethrow_exception_entry(); 284 } 285 286 // Compiled code 287 if (CodeCache::contains(return_address)) { 288 CodeBlob* blob = CodeCache::find_blob(return_address); 289 if (blob->is_nmethod()) { 290 nmethod* code = (nmethod*)blob; 291 assert(code != NULL, "nmethod must be present"); 292 assert(code->header_begin() != code->exception_begin(), "no exception handler"); 293 return code->exception_begin(); 294 } 295 if (blob->is_runtime_stub()) { 296 ShouldNotReachHere(); // callers are responsible for skipping runtime stub frames 297 } 298 } 299 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!"); 300 #ifndef PRODUCT 301 { ResourceMark rm; 302 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address); 303 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here"); 304 tty->print_cr("b) other problem"); 305 } 306 #endif // PRODUCT 307 ShouldNotReachHere(); 308 return NULL; 309 } 310 311 312 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(address return_address)) 313 return raw_exception_handler_for_return_address(return_address); 314 JRT_END 315 316 address SharedRuntime::get_poll_stub(address pc) { 317 address stub; 318 // Look up the code blob 319 CodeBlob *cb = CodeCache::find_blob(pc); 320 321 // Should be an nmethod 322 assert( cb && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod" ); 323 324 // Look up the relocation information 325 assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc), 326 "safepoint polling: type must be poll" ); 327 328 assert( ((NativeInstruction*)pc)->is_safepoint_poll(), 329 "Only polling locations are used for safepoint"); 330 331 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc); 332 if (at_poll_return) { 333 assert(SharedRuntime::polling_page_return_handler_blob() != NULL, 334 "polling page return stub not created yet"); 335 stub = SharedRuntime::polling_page_return_handler_blob()->instructions_begin(); 336 } else { 337 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL, 338 "polling page safepoint stub not created yet"); 339 stub = SharedRuntime::polling_page_safepoint_handler_blob()->instructions_begin(); 340 } 341 #ifndef PRODUCT 342 if( TraceSafepoint ) { 343 char buf[256]; 344 jio_snprintf(buf, sizeof(buf), 345 "... found polling page %s exception at pc = " 346 INTPTR_FORMAT ", stub =" INTPTR_FORMAT, 347 at_poll_return ? "return" : "loop", 348 (intptr_t)pc, (intptr_t)stub); 349 tty->print_raw_cr(buf); 350 } 351 #endif // PRODUCT 352 return stub; 353 } 354 355 356 oop SharedRuntime::retrieve_receiver( symbolHandle sig, frame caller ) { 357 assert(caller.is_interpreted_frame(), ""); 358 int args_size = ArgumentSizeComputer(sig).size() + 1; 359 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack"); 360 oop result = (oop) *caller.interpreter_frame_tos_at(args_size - 1); 361 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop"); 362 return result; 363 } 364 365 366 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) { 367 if (JvmtiExport::can_post_exceptions()) { 368 vframeStream vfst(thread, true); 369 methodHandle method = methodHandle(thread, vfst.method()); 370 address bcp = method()->bcp_from(vfst.bci()); 371 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception()); 372 } 373 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception); 374 } 375 376 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message) { 377 Handle h_exception = Exceptions::new_exception(thread, name, message); 378 throw_and_post_jvmti_exception(thread, h_exception); 379 } 380 381 // The interpreter code to call this tracing function is only 382 // called/generated when TraceRedefineClasses has the right bits 383 // set. Since obsolete methods are never compiled, we don't have 384 // to modify the compilers to generate calls to this function. 385 // 386 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry( 387 JavaThread* thread, methodOopDesc* method)) 388 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call"); 389 390 if (method->is_obsolete()) { 391 // We are calling an obsolete method, but this is not necessarily 392 // an error. Our method could have been redefined just after we 393 // fetched the methodOop from the constant pool. 394 395 // RC_TRACE macro has an embedded ResourceMark 396 RC_TRACE_WITH_THREAD(0x00001000, thread, 397 ("calling obsolete method '%s'", 398 method->name_and_sig_as_C_string())); 399 if (RC_TRACE_ENABLED(0x00002000)) { 400 // this option is provided to debug calls to obsolete methods 401 guarantee(false, "faulting at call to an obsolete method."); 402 } 403 } 404 return 0; 405 JRT_END 406 407 // ret_pc points into caller; we are returning caller's exception handler 408 // for given exception 409 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 410 bool force_unwind, bool top_frame_only) { 411 assert(nm != NULL, "must exist"); 412 ResourceMark rm; 413 414 ScopeDesc* sd = nm->scope_desc_at(ret_pc); 415 // determine handler bci, if any 416 EXCEPTION_MARK; 417 418 int handler_bci = -1; 419 int scope_depth = 0; 420 if (!force_unwind) { 421 int bci = sd->bci(); 422 do { 423 bool skip_scope_increment = false; 424 // exception handler lookup 425 KlassHandle ek (THREAD, exception->klass()); 426 handler_bci = sd->method()->fast_exception_handler_bci_for(ek, bci, THREAD); 427 if (HAS_PENDING_EXCEPTION) { 428 // We threw an exception while trying to find the exception handler. 429 // Transfer the new exception to the exception handle which will 430 // be set into thread local storage, and do another lookup for an 431 // exception handler for this exception, this time starting at the 432 // BCI of the exception handler which caused the exception to be 433 // thrown (bugs 4307310 and 4546590). Set "exception" reference 434 // argument to ensure that the correct exception is thrown (4870175). 435 exception = Handle(THREAD, PENDING_EXCEPTION); 436 CLEAR_PENDING_EXCEPTION; 437 if (handler_bci >= 0) { 438 bci = handler_bci; 439 handler_bci = -1; 440 skip_scope_increment = true; 441 } 442 } 443 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) { 444 sd = sd->sender(); 445 if (sd != NULL) { 446 bci = sd->bci(); 447 } 448 ++scope_depth; 449 } 450 } while (!top_frame_only && handler_bci < 0 && sd != NULL); 451 } 452 453 // found handling method => lookup exception handler 454 int catch_pco = ret_pc - nm->instructions_begin(); 455 456 ExceptionHandlerTable table(nm); 457 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth); 458 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) { 459 // Allow abbreviated catch tables. The idea is to allow a method 460 // to materialize its exceptions without committing to the exact 461 // routing of exceptions. In particular this is needed for adding 462 // a synthethic handler to unlock monitors when inlining 463 // synchonized methods since the unlock path isn't represented in 464 // the bytecodes. 465 t = table.entry_for(catch_pco, -1, 0); 466 } 467 468 #ifdef COMPILER1 469 if (nm->is_compiled_by_c1() && t == NULL && handler_bci == -1) { 470 // Exception is not handled by this frame so unwind. Note that 471 // this is not the same as how C2 does this. C2 emits a table 472 // entry that dispatches to the unwind code in the nmethod. 473 return NULL; 474 } 475 #endif /* COMPILER1 */ 476 477 478 if (t == NULL) { 479 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci); 480 tty->print_cr(" Exception:"); 481 exception->print(); 482 tty->cr(); 483 tty->print_cr(" Compiled exception table :"); 484 table.print(); 485 nm->print_code(); 486 guarantee(false, "missing exception handler"); 487 return NULL; 488 } 489 490 return nm->instructions_begin() + t->pco(); 491 } 492 493 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread)) 494 // These errors occur only at call sites 495 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError()); 496 JRT_END 497 498 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 499 // These errors occur only at call sites 500 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub"); 501 JRT_END 502 503 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread)) 504 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 505 JRT_END 506 507 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread)) 508 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 509 JRT_END 510 511 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread)) 512 // This entry point is effectively only used for NullPointerExceptions which occur at inline 513 // cache sites (when the callee activation is not yet set up) so we are at a call site 514 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 515 JRT_END 516 517 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread)) 518 // We avoid using the normal exception construction in this case because 519 // it performs an upcall to Java, and we're already out of stack space. 520 klassOop k = SystemDictionary::StackOverflowError_klass(); 521 oop exception_oop = instanceKlass::cast(k)->allocate_instance(CHECK); 522 Handle exception (thread, exception_oop); 523 if (StackTraceInThrowable) { 524 java_lang_Throwable::fill_in_stack_trace(exception); 525 } 526 throw_and_post_jvmti_exception(thread, exception); 527 JRT_END 528 529 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread, 530 address pc, 531 SharedRuntime::ImplicitExceptionKind exception_kind) 532 { 533 address target_pc = NULL; 534 535 if (Interpreter::contains(pc)) { 536 #ifdef CC_INTERP 537 // C++ interpreter doesn't throw implicit exceptions 538 ShouldNotReachHere(); 539 #else 540 switch (exception_kind) { 541 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry(); 542 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry(); 543 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry(); 544 default: ShouldNotReachHere(); 545 } 546 #endif // !CC_INTERP 547 } else { 548 switch (exception_kind) { 549 case STACK_OVERFLOW: { 550 // Stack overflow only occurs upon frame setup; the callee is 551 // going to be unwound. Dispatch to a shared runtime stub 552 // which will cause the StackOverflowError to be fabricated 553 // and processed. 554 // For stack overflow in deoptimization blob, cleanup thread. 555 if (thread->deopt_mark() != NULL) { 556 Deoptimization::cleanup_deopt_info(thread, NULL); 557 } 558 return StubRoutines::throw_StackOverflowError_entry(); 559 } 560 561 case IMPLICIT_NULL: { 562 if (VtableStubs::contains(pc)) { 563 // We haven't yet entered the callee frame. Fabricate an 564 // exception and begin dispatching it in the caller. Since 565 // the caller was at a call site, it's safe to destroy all 566 // caller-saved registers, as these entry points do. 567 VtableStub* vt_stub = VtableStubs::stub_containing(pc); 568 569 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error. 570 if (vt_stub == NULL) return NULL; 571 572 if (vt_stub->is_abstract_method_error(pc)) { 573 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs"); 574 return StubRoutines::throw_AbstractMethodError_entry(); 575 } else { 576 return StubRoutines::throw_NullPointerException_at_call_entry(); 577 } 578 } else { 579 CodeBlob* cb = CodeCache::find_blob(pc); 580 581 // If code blob is NULL, then return NULL to signal handler to report the SEGV error. 582 if (cb == NULL) return NULL; 583 584 // Exception happened in CodeCache. Must be either: 585 // 1. Inline-cache check in C2I handler blob, 586 // 2. Inline-cache check in nmethod, or 587 // 3. Implict null exception in nmethod 588 589 if (!cb->is_nmethod()) { 590 guarantee(cb->is_adapter_blob(), 591 "exception happened outside interpreter, nmethods and vtable stubs (1)"); 592 // There is no handler here, so we will simply unwind. 593 return StubRoutines::throw_NullPointerException_at_call_entry(); 594 } 595 596 // Otherwise, it's an nmethod. Consult its exception handlers. 597 nmethod* nm = (nmethod*)cb; 598 if (nm->inlinecache_check_contains(pc)) { 599 // exception happened inside inline-cache check code 600 // => the nmethod is not yet active (i.e., the frame 601 // is not set up yet) => use return address pushed by 602 // caller => don't push another return address 603 return StubRoutines::throw_NullPointerException_at_call_entry(); 604 } 605 606 #ifndef PRODUCT 607 _implicit_null_throws++; 608 #endif 609 target_pc = nm->continuation_for_implicit_exception(pc); 610 guarantee(target_pc != 0, "must have a continuation point"); 611 } 612 613 break; // fall through 614 } 615 616 617 case IMPLICIT_DIVIDE_BY_ZERO: { 618 nmethod* nm = CodeCache::find_nmethod(pc); 619 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions"); 620 #ifndef PRODUCT 621 _implicit_div0_throws++; 622 #endif 623 target_pc = nm->continuation_for_implicit_exception(pc); 624 guarantee(target_pc != 0, "must have a continuation point"); 625 break; // fall through 626 } 627 628 default: ShouldNotReachHere(); 629 } 630 631 guarantee(target_pc != NULL, "must have computed destination PC for implicit exception"); 632 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind"); 633 634 // for AbortVMOnException flag 635 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException")); 636 if (exception_kind == IMPLICIT_NULL) { 637 Events::log("Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc); 638 } else { 639 Events::log("Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc); 640 } 641 return target_pc; 642 } 643 644 ShouldNotReachHere(); 645 return NULL; 646 } 647 648 649 JNI_ENTRY(void, throw_unsatisfied_link_error(JNIEnv* env, ...)) 650 { 651 THROW(vmSymbols::java_lang_UnsatisfiedLinkError()); 652 } 653 JNI_END 654 655 656 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() { 657 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error); 658 } 659 660 661 #ifndef PRODUCT 662 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2)) 663 const frame f = thread->last_frame(); 664 assert(f.is_interpreted_frame(), "must be an interpreted frame"); 665 #ifndef PRODUCT 666 methodHandle mh(THREAD, f.interpreter_frame_method()); 667 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2); 668 #endif // !PRODUCT 669 return preserve_this_value; 670 JRT_END 671 #endif // !PRODUCT 672 673 674 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts)) 675 os::yield_all(attempts); 676 JRT_END 677 678 679 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) 680 assert(obj->is_oop(), "must be a valid oop"); 681 assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise"); 682 instanceKlass::register_finalizer(instanceOop(obj), CHECK); 683 JRT_END 684 685 686 jlong SharedRuntime::get_java_tid(Thread* thread) { 687 if (thread != NULL) { 688 if (thread->is_Java_thread()) { 689 oop obj = ((JavaThread*)thread)->threadObj(); 690 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj); 691 } 692 } 693 return 0; 694 } 695 696 /** 697 * This function ought to be a void function, but cannot be because 698 * it gets turned into a tail-call on sparc, which runs into dtrace bug 699 * 6254741. Once that is fixed we can remove the dummy return value. 700 */ 701 int SharedRuntime::dtrace_object_alloc(oopDesc* o) { 702 return dtrace_object_alloc_base(Thread::current(), o); 703 } 704 705 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o) { 706 assert(DTraceAllocProbes, "wrong call"); 707 Klass* klass = o->blueprint(); 708 int size = o->size(); 709 symbolOop name = klass->name(); 710 HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread), 711 name->bytes(), name->utf8_length(), size * HeapWordSize); 712 return 0; 713 } 714 715 JRT_LEAF(int, SharedRuntime::dtrace_method_entry( 716 JavaThread* thread, methodOopDesc* method)) 717 assert(DTraceMethodProbes, "wrong call"); 718 symbolOop kname = method->klass_name(); 719 symbolOop name = method->name(); 720 symbolOop sig = method->signature(); 721 HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread), 722 kname->bytes(), kname->utf8_length(), 723 name->bytes(), name->utf8_length(), 724 sig->bytes(), sig->utf8_length()); 725 return 0; 726 JRT_END 727 728 JRT_LEAF(int, SharedRuntime::dtrace_method_exit( 729 JavaThread* thread, methodOopDesc* method)) 730 assert(DTraceMethodProbes, "wrong call"); 731 symbolOop kname = method->klass_name(); 732 symbolOop name = method->name(); 733 symbolOop sig = method->signature(); 734 HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread), 735 kname->bytes(), kname->utf8_length(), 736 name->bytes(), name->utf8_length(), 737 sig->bytes(), sig->utf8_length()); 738 return 0; 739 JRT_END 740 741 742 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode) 743 // for a call current in progress, i.e., arguments has been pushed on stack 744 // put callee has not been invoked yet. Used by: resolve virtual/static, 745 // vtable updates, etc. Caller frame must be compiled. 746 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) { 747 ResourceMark rm(THREAD); 748 749 // last java frame on stack (which includes native call frames) 750 vframeStream vfst(thread, true); // Do not skip and javaCalls 751 752 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle())); 753 } 754 755 756 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode 757 // for a call current in progress, i.e., arguments has been pushed on stack 758 // but callee has not been invoked yet. Caller frame must be compiled. 759 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread, 760 vframeStream& vfst, 761 Bytecodes::Code& bc, 762 CallInfo& callinfo, TRAPS) { 763 Handle receiver; 764 Handle nullHandle; //create a handy null handle for exception returns 765 766 assert(!vfst.at_end(), "Java frame must exist"); 767 768 // Find caller and bci from vframe 769 methodHandle caller (THREAD, vfst.method()); 770 int bci = vfst.bci(); 771 772 // Find bytecode 773 Bytecode_invoke* bytecode = Bytecode_invoke_at(caller, bci); 774 bc = bytecode->adjusted_invoke_code(); 775 int bytecode_index = bytecode->index(); 776 777 // Find receiver for non-static call 778 if (bc != Bytecodes::_invokestatic) { 779 // This register map must be update since we need to find the receiver for 780 // compiled frames. The receiver might be in a register. 781 RegisterMap reg_map2(thread); 782 frame stubFrame = thread->last_frame(); 783 // Caller-frame is a compiled frame 784 frame callerFrame = stubFrame.sender(®_map2); 785 786 methodHandle callee = bytecode->static_target(CHECK_(nullHandle)); 787 if (callee.is_null()) { 788 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle); 789 } 790 // Retrieve from a compiled argument list 791 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2)); 792 793 if (receiver.is_null()) { 794 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle); 795 } 796 } 797 798 // Resolve method. This is parameterized by bytecode. 799 constantPoolHandle constants (THREAD, caller->constants()); 800 assert (receiver.is_null() || receiver->is_oop(), "wrong receiver"); 801 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle)); 802 803 #ifdef ASSERT 804 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls 805 if (bc != Bytecodes::_invokestatic && bc != Bytecodes::_invokedynamic) { 806 assert(receiver.not_null(), "should have thrown exception"); 807 KlassHandle receiver_klass (THREAD, receiver->klass()); 808 klassOop rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle)); 809 // klass is already loaded 810 KlassHandle static_receiver_klass (THREAD, rk); 811 assert(receiver_klass->is_subtype_of(static_receiver_klass()), "actual receiver must be subclass of static receiver klass"); 812 if (receiver_klass->oop_is_instance()) { 813 if (instanceKlass::cast(receiver_klass())->is_not_initialized()) { 814 tty->print_cr("ERROR: Klass not yet initialized!!"); 815 receiver_klass.print(); 816 } 817 assert (!instanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized"); 818 } 819 } 820 #endif 821 822 return receiver; 823 } 824 825 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) { 826 ResourceMark rm(THREAD); 827 // We need first to check if any Java activations (compiled, interpreted) 828 // exist on the stack since last JavaCall. If not, we need 829 // to get the target method from the JavaCall wrapper. 830 vframeStream vfst(thread, true); // Do not skip any javaCalls 831 methodHandle callee_method; 832 if (vfst.at_end()) { 833 // No Java frames were found on stack since we did the JavaCall. 834 // Hence the stack can only contain an entry_frame. We need to 835 // find the target method from the stub frame. 836 RegisterMap reg_map(thread, false); 837 frame fr = thread->last_frame(); 838 assert(fr.is_runtime_frame(), "must be a runtimeStub"); 839 fr = fr.sender(®_map); 840 assert(fr.is_entry_frame(), "must be"); 841 // fr is now pointing to the entry frame. 842 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method()); 843 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??"); 844 } else { 845 Bytecodes::Code bc; 846 CallInfo callinfo; 847 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle())); 848 callee_method = callinfo.selected_method(); 849 } 850 assert(callee_method()->is_method(), "must be"); 851 return callee_method; 852 } 853 854 // Resolves a call. 855 methodHandle SharedRuntime::resolve_helper(JavaThread *thread, 856 bool is_virtual, 857 bool is_optimized, TRAPS) { 858 methodHandle callee_method; 859 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 860 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 861 int retry_count = 0; 862 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() && 863 callee_method->method_holder() != SystemDictionary::Object_klass()) { 864 // If has a pending exception then there is no need to re-try to 865 // resolve this method. 866 // If the method has been redefined, we need to try again. 867 // Hack: we have no way to update the vtables of arrays, so don't 868 // require that java.lang.Object has been updated. 869 870 // It is very unlikely that method is redefined more than 100 times 871 // in the middle of resolve. If it is looping here more than 100 times 872 // means then there could be a bug here. 873 guarantee((retry_count++ < 100), 874 "Could not resolve to latest version of redefined method"); 875 // method is redefined in the middle of resolve so re-try. 876 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); 877 } 878 } 879 return callee_method; 880 } 881 882 // Resolves a call. The compilers generate code for calls that go here 883 // and are patched with the real destination of the call. 884 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread, 885 bool is_virtual, 886 bool is_optimized, TRAPS) { 887 888 ResourceMark rm(thread); 889 RegisterMap cbl_map(thread, false); 890 frame caller_frame = thread->last_frame().sender(&cbl_map); 891 892 CodeBlob* cb = caller_frame.cb(); 893 guarantee(cb != NULL && cb->is_nmethod(), "must be called from nmethod"); 894 // make sure caller is not getting deoptimized 895 // and removed before we are done with it. 896 // CLEANUP - with lazy deopt shouldn't need this lock 897 nmethodLocker caller_lock((nmethod*)cb); 898 899 900 // determine call info & receiver 901 // note: a) receiver is NULL for static calls 902 // b) an exception is thrown if receiver is NULL for non-static calls 903 CallInfo call_info; 904 Bytecodes::Code invoke_code = Bytecodes::_illegal; 905 Handle receiver = find_callee_info(thread, invoke_code, 906 call_info, CHECK_(methodHandle())); 907 methodHandle callee_method = call_info.selected_method(); 908 909 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic) || 910 ( is_virtual && invoke_code != Bytecodes::_invokestatic), "inconsistent bytecode"); 911 912 #ifndef PRODUCT 913 // tracing/debugging/statistics 914 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) : 915 (is_virtual) ? (&_resolve_virtual_ctr) : 916 (&_resolve_static_ctr); 917 Atomic::inc(addr); 918 919 if (TraceCallFixup) { 920 ResourceMark rm(thread); 921 tty->print("resolving %s%s (%s) call to", 922 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static", 923 Bytecodes::name(invoke_code)); 924 callee_method->print_short_name(tty); 925 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 926 } 927 #endif 928 929 // Compute entry points. This might require generation of C2I converter 930 // frames, so we cannot be holding any locks here. Furthermore, the 931 // computation of the entry points is independent of patching the call. We 932 // always return the entry-point, but we only patch the stub if the call has 933 // not been deoptimized. Return values: For a virtual call this is an 934 // (cached_oop, destination address) pair. For a static call/optimized 935 // virtual this is just a destination address. 936 937 StaticCallInfo static_call_info; 938 CompiledICInfo virtual_call_info; 939 940 941 // Make sure the callee nmethod does not get deoptimized and removed before 942 // we are done patching the code. 943 nmethod* nm = callee_method->code(); 944 nmethodLocker nl_callee(nm); 945 #ifdef ASSERT 946 address dest_entry_point = nm == NULL ? 0 : nm->entry_point(); // used below 947 #endif 948 949 if (is_virtual) { 950 assert(receiver.not_null(), "sanity check"); 951 bool static_bound = call_info.resolved_method()->can_be_statically_bound(); 952 KlassHandle h_klass(THREAD, receiver->klass()); 953 CompiledIC::compute_monomorphic_entry(callee_method, h_klass, 954 is_optimized, static_bound, virtual_call_info, 955 CHECK_(methodHandle())); 956 } else { 957 // static call 958 CompiledStaticCall::compute_entry(callee_method, static_call_info); 959 } 960 961 // grab lock, check for deoptimization and potentially patch caller 962 { 963 MutexLocker ml_patch(CompiledIC_lock); 964 965 // Now that we are ready to patch if the methodOop was redefined then 966 // don't update call site and let the caller retry. 967 968 if (!callee_method->is_old()) { 969 #ifdef ASSERT 970 // We must not try to patch to jump to an already unloaded method. 971 if (dest_entry_point != 0) { 972 assert(CodeCache::find_blob(dest_entry_point) != NULL, 973 "should not unload nmethod while locked"); 974 } 975 #endif 976 if (is_virtual) { 977 CompiledIC* inline_cache = CompiledIC_before(caller_frame.pc()); 978 if (inline_cache->is_clean()) { 979 inline_cache->set_to_monomorphic(virtual_call_info); 980 } 981 } else { 982 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc()); 983 if (ssc->is_clean()) ssc->set(static_call_info); 984 } 985 } 986 987 } // unlock CompiledIC_lock 988 989 return callee_method; 990 } 991 992 993 // Inline caches exist only in compiled code 994 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread)) 995 #ifdef ASSERT 996 RegisterMap reg_map(thread, false); 997 frame stub_frame = thread->last_frame(); 998 assert(stub_frame.is_runtime_frame(), "sanity check"); 999 frame caller_frame = stub_frame.sender(®_map); 1000 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame"); 1001 #endif /* ASSERT */ 1002 1003 methodHandle callee_method; 1004 JRT_BLOCK 1005 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL); 1006 // Return methodOop through TLS 1007 thread->set_vm_result(callee_method()); 1008 JRT_BLOCK_END 1009 // return compiled code entry point after potential safepoints 1010 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1011 return callee_method->verified_code_entry(); 1012 JRT_END 1013 1014 1015 // Handle call site that has been made non-entrant 1016 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread)) 1017 // 6243940 We might end up in here if the callee is deoptimized 1018 // as we race to call it. We don't want to take a safepoint if 1019 // the caller was interpreted because the caller frame will look 1020 // interpreted to the stack walkers and arguments are now 1021 // "compiled" so it is much better to make this transition 1022 // invisible to the stack walking code. The i2c path will 1023 // place the callee method in the callee_target. It is stashed 1024 // there because if we try and find the callee by normal means a 1025 // safepoint is possible and have trouble gc'ing the compiled args. 1026 RegisterMap reg_map(thread, false); 1027 frame stub_frame = thread->last_frame(); 1028 assert(stub_frame.is_runtime_frame(), "sanity check"); 1029 frame caller_frame = stub_frame.sender(®_map); 1030 1031 // MethodHandle invokes don't have a CompiledIC and should always 1032 // simply redispatch to the callee_target. 1033 address sender_pc = caller_frame.pc(); 1034 CodeBlob* sender_cb = caller_frame.cb(); 1035 nmethod* sender_nm = sender_cb->as_nmethod_or_null(); 1036 1037 if (caller_frame.is_interpreted_frame() || 1038 caller_frame.is_entry_frame() || 1039 (sender_nm != NULL && sender_nm->is_method_handle_return(sender_pc))) { 1040 methodOop callee = thread->callee_target(); 1041 guarantee(callee != NULL && callee->is_method(), "bad handshake"); 1042 thread->set_vm_result(callee); 1043 thread->set_callee_target(NULL); 1044 return callee->get_c2i_entry(); 1045 } 1046 1047 // Must be compiled to compiled path which is safe to stackwalk 1048 methodHandle callee_method; 1049 JRT_BLOCK 1050 // Force resolving of caller (if we called from compiled frame) 1051 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL); 1052 thread->set_vm_result(callee_method()); 1053 JRT_BLOCK_END 1054 // return compiled code entry point after potential safepoints 1055 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1056 return callee_method->verified_code_entry(); 1057 JRT_END 1058 1059 1060 // resolve a static call and patch code 1061 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread )) 1062 methodHandle callee_method; 1063 JRT_BLOCK 1064 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL); 1065 thread->set_vm_result(callee_method()); 1066 JRT_BLOCK_END 1067 // return compiled code entry point after potential safepoints 1068 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1069 return callee_method->verified_code_entry(); 1070 JRT_END 1071 1072 1073 // resolve virtual call and update inline cache to monomorphic 1074 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread )) 1075 methodHandle callee_method; 1076 JRT_BLOCK 1077 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL); 1078 thread->set_vm_result(callee_method()); 1079 JRT_BLOCK_END 1080 // return compiled code entry point after potential safepoints 1081 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1082 return callee_method->verified_code_entry(); 1083 JRT_END 1084 1085 1086 // Resolve a virtual call that can be statically bound (e.g., always 1087 // monomorphic, so it has no inline cache). Patch code to resolved target. 1088 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread)) 1089 methodHandle callee_method; 1090 JRT_BLOCK 1091 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL); 1092 thread->set_vm_result(callee_method()); 1093 JRT_BLOCK_END 1094 // return compiled code entry point after potential safepoints 1095 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); 1096 return callee_method->verified_code_entry(); 1097 JRT_END 1098 1099 1100 1101 1102 1103 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) { 1104 ResourceMark rm(thread); 1105 CallInfo call_info; 1106 Bytecodes::Code bc; 1107 1108 // receiver is NULL for static calls. An exception is thrown for NULL 1109 // receivers for non-static calls 1110 Handle receiver = find_callee_info(thread, bc, call_info, 1111 CHECK_(methodHandle())); 1112 // Compiler1 can produce virtual call sites that can actually be statically bound 1113 // If we fell thru to below we would think that the site was going megamorphic 1114 // when in fact the site can never miss. Worse because we'd think it was megamorphic 1115 // we'd try and do a vtable dispatch however methods that can be statically bound 1116 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a 1117 // reresolution of the call site (as if we did a handle_wrong_method and not an 1118 // plain ic_miss) and the site will be converted to an optimized virtual call site 1119 // never to miss again. I don't believe C2 will produce code like this but if it 1120 // did this would still be the correct thing to do for it too, hence no ifdef. 1121 // 1122 if (call_info.resolved_method()->can_be_statically_bound()) { 1123 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle())); 1124 if (TraceCallFixup) { 1125 RegisterMap reg_map(thread, false); 1126 frame caller_frame = thread->last_frame().sender(®_map); 1127 ResourceMark rm(thread); 1128 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc)); 1129 callee_method->print_short_name(tty); 1130 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc()); 1131 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1132 } 1133 return callee_method; 1134 } 1135 1136 methodHandle callee_method = call_info.selected_method(); 1137 1138 bool should_be_mono = false; 1139 1140 #ifndef PRODUCT 1141 Atomic::inc(&_ic_miss_ctr); 1142 1143 // Statistics & Tracing 1144 if (TraceCallFixup) { 1145 ResourceMark rm(thread); 1146 tty->print("IC miss (%s) call to", Bytecodes::name(bc)); 1147 callee_method->print_short_name(tty); 1148 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1149 } 1150 1151 if (ICMissHistogram) { 1152 MutexLocker m(VMStatistic_lock); 1153 RegisterMap reg_map(thread, false); 1154 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub 1155 // produce statistics under the lock 1156 trace_ic_miss(f.pc()); 1157 } 1158 #endif 1159 1160 // install an event collector so that when a vtable stub is created the 1161 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The 1162 // event can't be posted when the stub is created as locks are held 1163 // - instead the event will be deferred until the event collector goes 1164 // out of scope. 1165 JvmtiDynamicCodeEventCollector event_collector; 1166 1167 // Update inline cache to megamorphic. Skip update if caller has been 1168 // made non-entrant or we are called from interpreted. 1169 { MutexLocker ml_patch (CompiledIC_lock); 1170 RegisterMap reg_map(thread, false); 1171 frame caller_frame = thread->last_frame().sender(®_map); 1172 CodeBlob* cb = caller_frame.cb(); 1173 if (cb->is_nmethod() && ((nmethod*)cb)->is_in_use()) { 1174 // Not a non-entrant nmethod, so find inline_cache 1175 CompiledIC* inline_cache = CompiledIC_before(caller_frame.pc()); 1176 bool should_be_mono = false; 1177 if (inline_cache->is_optimized()) { 1178 if (TraceCallFixup) { 1179 ResourceMark rm(thread); 1180 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc)); 1181 callee_method->print_short_name(tty); 1182 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1183 } 1184 should_be_mono = true; 1185 } else { 1186 compiledICHolderOop ic_oop = (compiledICHolderOop) inline_cache->cached_oop(); 1187 if ( ic_oop != NULL && ic_oop->is_compiledICHolder()) { 1188 1189 if (receiver()->klass() == ic_oop->holder_klass()) { 1190 // This isn't a real miss. We must have seen that compiled code 1191 // is now available and we want the call site converted to a 1192 // monomorphic compiled call site. 1193 // We can't assert for callee_method->code() != NULL because it 1194 // could have been deoptimized in the meantime 1195 if (TraceCallFixup) { 1196 ResourceMark rm(thread); 1197 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc)); 1198 callee_method->print_short_name(tty); 1199 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1200 } 1201 should_be_mono = true; 1202 } 1203 } 1204 } 1205 1206 if (should_be_mono) { 1207 1208 // We have a path that was monomorphic but was going interpreted 1209 // and now we have (or had) a compiled entry. We correct the IC 1210 // by using a new icBuffer. 1211 CompiledICInfo info; 1212 KlassHandle receiver_klass(THREAD, receiver()->klass()); 1213 inline_cache->compute_monomorphic_entry(callee_method, 1214 receiver_klass, 1215 inline_cache->is_optimized(), 1216 false, 1217 info, CHECK_(methodHandle())); 1218 inline_cache->set_to_monomorphic(info); 1219 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) { 1220 // Change to megamorphic 1221 inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle())); 1222 } else { 1223 // Either clean or megamorphic 1224 } 1225 } 1226 } // Release CompiledIC_lock 1227 1228 return callee_method; 1229 } 1230 1231 // 1232 // Resets a call-site in compiled code so it will get resolved again. 1233 // This routines handles both virtual call sites, optimized virtual call 1234 // sites, and static call sites. Typically used to change a call sites 1235 // destination from compiled to interpreted. 1236 // 1237 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) { 1238 ResourceMark rm(thread); 1239 RegisterMap reg_map(thread, false); 1240 frame stub_frame = thread->last_frame(); 1241 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub"); 1242 frame caller = stub_frame.sender(®_map); 1243 1244 // Do nothing if the frame isn't a live compiled frame. 1245 // nmethod could be deoptimized by the time we get here 1246 // so no update to the caller is needed. 1247 1248 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) { 1249 1250 address pc = caller.pc(); 1251 Events::log("update call-site at pc " INTPTR_FORMAT, pc); 1252 1253 // Default call_addr is the location of the "basic" call. 1254 // Determine the address of the call we a reresolving. With 1255 // Inline Caches we will always find a recognizable call. 1256 // With Inline Caches disabled we may or may not find a 1257 // recognizable call. We will always find a call for static 1258 // calls and for optimized virtual calls. For vanilla virtual 1259 // calls it depends on the state of the UseInlineCaches switch. 1260 // 1261 // With Inline Caches disabled we can get here for a virtual call 1262 // for two reasons: 1263 // 1 - calling an abstract method. The vtable for abstract methods 1264 // will run us thru handle_wrong_method and we will eventually 1265 // end up in the interpreter to throw the ame. 1266 // 2 - a racing deoptimization. We could be doing a vanilla vtable 1267 // call and between the time we fetch the entry address and 1268 // we jump to it the target gets deoptimized. Similar to 1 1269 // we will wind up in the interprter (thru a c2i with c2). 1270 // 1271 address call_addr = NULL; 1272 { 1273 // Get call instruction under lock because another thread may be 1274 // busy patching it. 1275 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1276 // Location of call instruction 1277 if (NativeCall::is_call_before(pc)) { 1278 NativeCall *ncall = nativeCall_before(pc); 1279 call_addr = ncall->instruction_address(); 1280 } 1281 } 1282 1283 // Check for static or virtual call 1284 bool is_static_call = false; 1285 nmethod* caller_nm = CodeCache::find_nmethod(pc); 1286 // Make sure nmethod doesn't get deoptimized and removed until 1287 // this is done with it. 1288 // CLEANUP - with lazy deopt shouldn't need this lock 1289 nmethodLocker nmlock(caller_nm); 1290 1291 if (call_addr != NULL) { 1292 RelocIterator iter(caller_nm, call_addr, call_addr+1); 1293 int ret = iter.next(); // Get item 1294 if (ret) { 1295 assert(iter.addr() == call_addr, "must find call"); 1296 if (iter.type() == relocInfo::static_call_type) { 1297 is_static_call = true; 1298 } else { 1299 assert(iter.type() == relocInfo::virtual_call_type || 1300 iter.type() == relocInfo::opt_virtual_call_type 1301 , "unexpected relocInfo. type"); 1302 } 1303 } else { 1304 assert(!UseInlineCaches, "relocation info. must exist for this address"); 1305 } 1306 1307 // Cleaning the inline cache will force a new resolve. This is more robust 1308 // than directly setting it to the new destination, since resolving of calls 1309 // is always done through the same code path. (experience shows that it 1310 // leads to very hard to track down bugs, if an inline cache gets updated 1311 // to a wrong method). It should not be performance critical, since the 1312 // resolve is only done once. 1313 1314 MutexLocker ml(CompiledIC_lock); 1315 // 1316 // We do not patch the call site if the nmethod has been made non-entrant 1317 // as it is a waste of time 1318 // 1319 if (caller_nm->is_in_use()) { 1320 if (is_static_call) { 1321 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr); 1322 ssc->set_to_clean(); 1323 } else { 1324 // compiled, dispatched call (which used to call an interpreted method) 1325 CompiledIC* inline_cache = CompiledIC_at(call_addr); 1326 inline_cache->set_to_clean(); 1327 } 1328 } 1329 } 1330 1331 } 1332 1333 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle())); 1334 1335 1336 #ifndef PRODUCT 1337 Atomic::inc(&_wrong_method_ctr); 1338 1339 if (TraceCallFixup) { 1340 ResourceMark rm(thread); 1341 tty->print("handle_wrong_method reresolving call to"); 1342 callee_method->print_short_name(tty); 1343 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); 1344 } 1345 #endif 1346 1347 return callee_method; 1348 } 1349 1350 // --------------------------------------------------------------------------- 1351 // We are calling the interpreter via a c2i. Normally this would mean that 1352 // we were called by a compiled method. However we could have lost a race 1353 // where we went int -> i2c -> c2i and so the caller could in fact be 1354 // interpreted. If the caller is compiled we attampt to patch the caller 1355 // so he no longer calls into the interpreter. 1356 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(methodOopDesc* method, address caller_pc)) 1357 methodOop moop(method); 1358 1359 address entry_point = moop->from_compiled_entry(); 1360 1361 // It's possible that deoptimization can occur at a call site which hasn't 1362 // been resolved yet, in which case this function will be called from 1363 // an nmethod that has been patched for deopt and we can ignore the 1364 // request for a fixup. 1365 // Also it is possible that we lost a race in that from_compiled_entry 1366 // is now back to the i2c in that case we don't need to patch and if 1367 // we did we'd leap into space because the callsite needs to use 1368 // "to interpreter" stub in order to load up the methodOop. Don't 1369 // ask me how I know this... 1370 // 1371 1372 CodeBlob* cb = CodeCache::find_blob(caller_pc); 1373 if ( !cb->is_nmethod() || entry_point == moop->get_c2i_entry()) { 1374 return; 1375 } 1376 1377 // There is a benign race here. We could be attempting to patch to a compiled 1378 // entry point at the same time the callee is being deoptimized. If that is 1379 // the case then entry_point may in fact point to a c2i and we'd patch the 1380 // call site with the same old data. clear_code will set code() to NULL 1381 // at the end of it. If we happen to see that NULL then we can skip trying 1382 // to patch. If we hit the window where the callee has a c2i in the 1383 // from_compiled_entry and the NULL isn't present yet then we lose the race 1384 // and patch the code with the same old data. Asi es la vida. 1385 1386 if (moop->code() == NULL) return; 1387 1388 if (((nmethod*)cb)->is_in_use()) { 1389 1390 // Expect to find a native call there (unless it was no-inline cache vtable dispatch) 1391 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); 1392 if (NativeCall::is_call_before(caller_pc + frame::pc_return_offset)) { 1393 NativeCall *call = nativeCall_before(caller_pc + frame::pc_return_offset); 1394 // 1395 // bug 6281185. We might get here after resolving a call site to a vanilla 1396 // virtual call. Because the resolvee uses the verified entry it may then 1397 // see compiled code and attempt to patch the site by calling us. This would 1398 // then incorrectly convert the call site to optimized and its downhill from 1399 // there. If you're lucky you'll get the assert in the bugid, if not you've 1400 // just made a call site that could be megamorphic into a monomorphic site 1401 // for the rest of its life! Just another racing bug in the life of 1402 // fixup_callers_callsite ... 1403 // 1404 RelocIterator iter(cb, call->instruction_address(), call->next_instruction_address()); 1405 iter.next(); 1406 assert(iter.has_current(), "must have a reloc at java call site"); 1407 relocInfo::relocType typ = iter.reloc()->type(); 1408 if ( typ != relocInfo::static_call_type && 1409 typ != relocInfo::opt_virtual_call_type && 1410 typ != relocInfo::static_stub_type) { 1411 return; 1412 } 1413 address destination = call->destination(); 1414 if (destination != entry_point) { 1415 CodeBlob* callee = CodeCache::find_blob(destination); 1416 // callee == cb seems weird. It means calling interpreter thru stub. 1417 if (callee == cb || callee->is_adapter_blob()) { 1418 // static call or optimized virtual 1419 if (TraceCallFixup) { 1420 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); 1421 moop->print_short_name(tty); 1422 tty->print_cr(" to " INTPTR_FORMAT, entry_point); 1423 } 1424 call->set_destination_mt_safe(entry_point); 1425 } else { 1426 if (TraceCallFixup) { 1427 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); 1428 moop->print_short_name(tty); 1429 tty->print_cr(" to " INTPTR_FORMAT, entry_point); 1430 } 1431 // assert is too strong could also be resolve destinations. 1432 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be"); 1433 } 1434 } else { 1435 if (TraceCallFixup) { 1436 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); 1437 moop->print_short_name(tty); 1438 tty->print_cr(" to " INTPTR_FORMAT, entry_point); 1439 } 1440 } 1441 } 1442 } 1443 1444 IRT_END 1445 1446 1447 // same as JVM_Arraycopy, but called directly from compiled code 1448 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos, 1449 oopDesc* dest, jint dest_pos, 1450 jint length, 1451 JavaThread* thread)) { 1452 #ifndef PRODUCT 1453 _slow_array_copy_ctr++; 1454 #endif 1455 // Check if we have null pointers 1456 if (src == NULL || dest == NULL) { 1457 THROW(vmSymbols::java_lang_NullPointerException()); 1458 } 1459 // Do the copy. The casts to arrayOop are necessary to the copy_array API, 1460 // even though the copy_array API also performs dynamic checks to ensure 1461 // that src and dest are truly arrays (and are conformable). 1462 // The copy_array mechanism is awkward and could be removed, but 1463 // the compilers don't call this function except as a last resort, 1464 // so it probably doesn't matter. 1465 Klass::cast(src->klass())->copy_array((arrayOopDesc*)src, src_pos, 1466 (arrayOopDesc*)dest, dest_pos, 1467 length, thread); 1468 } 1469 JRT_END 1470 1471 char* SharedRuntime::generate_class_cast_message( 1472 JavaThread* thread, const char* objName) { 1473 1474 // Get target class name from the checkcast instruction 1475 vframeStream vfst(thread, true); 1476 assert(!vfst.at_end(), "Java frame must exist"); 1477 Bytecode_checkcast* cc = Bytecode_checkcast_at( 1478 vfst.method()->bcp_from(vfst.bci())); 1479 Klass* targetKlass = Klass::cast(vfst.method()->constants()->klass_at( 1480 cc->index(), thread)); 1481 return generate_class_cast_message(objName, targetKlass->external_name()); 1482 } 1483 1484 char* SharedRuntime::generate_wrong_method_type_message(JavaThread* thread, 1485 oopDesc* required, 1486 oopDesc* actual) { 1487 assert(EnableMethodHandles, ""); 1488 oop singleKlass = wrong_method_type_is_for_single_argument(thread, required); 1489 if (singleKlass != NULL) { 1490 const char* objName = "argument or return value"; 1491 if (actual != NULL) { 1492 // be flexible about the junk passed in: 1493 klassOop ak = (actual->is_klass() 1494 ? (klassOop)actual 1495 : actual->klass()); 1496 objName = Klass::cast(ak)->external_name(); 1497 } 1498 Klass* targetKlass = Klass::cast(required->is_klass() 1499 ? (klassOop)required 1500 : java_lang_Class::as_klassOop(required)); 1501 return generate_class_cast_message(objName, targetKlass->external_name()); 1502 } else { 1503 // %%% need to get the MethodType string, without messing around too much 1504 // Get a signature from the invoke instruction 1505 const char* mhName = "method handle"; 1506 const char* targetType = "the required signature"; 1507 vframeStream vfst(thread, true); 1508 if (!vfst.at_end()) { 1509 Bytecode_invoke* call = Bytecode_invoke_at(vfst.method(), vfst.bci()); 1510 methodHandle target; 1511 { 1512 EXCEPTION_MARK; 1513 target = call->static_target(THREAD); 1514 if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; } 1515 } 1516 if (target.not_null() 1517 && target->is_method_handle_invoke() 1518 && required == target->method_handle_type()) { 1519 targetType = target->signature()->as_C_string(); 1520 } 1521 } 1522 klassOop kignore; int fignore; 1523 methodOop actual_method = MethodHandles::decode_method(actual, 1524 kignore, fignore); 1525 if (actual_method != NULL) { 1526 if (actual_method->name() == vmSymbols::invoke_name()) 1527 mhName = "$"; 1528 else 1529 mhName = actual_method->signature()->as_C_string(); 1530 if (mhName[0] == '$') 1531 mhName = actual_method->signature()->as_C_string(); 1532 } 1533 return generate_class_cast_message(mhName, targetType, 1534 " cannot be called as "); 1535 } 1536 } 1537 1538 oop SharedRuntime::wrong_method_type_is_for_single_argument(JavaThread* thr, 1539 oopDesc* required) { 1540 if (required == NULL) return NULL; 1541 if (required->klass() == SystemDictionary::Class_klass()) 1542 return required; 1543 if (required->is_klass()) 1544 return Klass::cast(klassOop(required))->java_mirror(); 1545 return NULL; 1546 } 1547 1548 1549 char* SharedRuntime::generate_class_cast_message( 1550 const char* objName, const char* targetKlassName, const char* desc) { 1551 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1; 1552 1553 char* message = NEW_RESOURCE_ARRAY(char, msglen); 1554 if (NULL == message) { 1555 // Shouldn't happen, but don't cause even more problems if it does 1556 message = const_cast<char*>(objName); 1557 } else { 1558 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName); 1559 } 1560 return message; 1561 } 1562 1563 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages()) 1564 (void) JavaThread::current()->reguard_stack(); 1565 JRT_END 1566 1567 1568 // Handles the uncommon case in locking, i.e., contention or an inflated lock. 1569 #ifndef PRODUCT 1570 int SharedRuntime::_monitor_enter_ctr=0; 1571 #endif 1572 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread)) 1573 oop obj(_obj); 1574 #ifndef PRODUCT 1575 _monitor_enter_ctr++; // monitor enter slow 1576 #endif 1577 if (PrintBiasedLockingStatistics) { 1578 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 1579 } 1580 Handle h_obj(THREAD, obj); 1581 if (UseBiasedLocking) { 1582 // Retry fast entry if bias is revoked to avoid unnecessary inflation 1583 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK); 1584 } else { 1585 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK); 1586 } 1587 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here"); 1588 JRT_END 1589 1590 #ifndef PRODUCT 1591 int SharedRuntime::_monitor_exit_ctr=0; 1592 #endif 1593 // Handles the uncommon cases of monitor unlocking in compiled code 1594 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock)) 1595 oop obj(_obj); 1596 #ifndef PRODUCT 1597 _monitor_exit_ctr++; // monitor exit slow 1598 #endif 1599 Thread* THREAD = JavaThread::current(); 1600 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore 1601 // testing was unable to ever fire the assert that guarded it so I have removed it. 1602 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?"); 1603 #undef MIGHT_HAVE_PENDING 1604 #ifdef MIGHT_HAVE_PENDING 1605 // Save and restore any pending_exception around the exception mark. 1606 // While the slow_exit must not throw an exception, we could come into 1607 // this routine with one set. 1608 oop pending_excep = NULL; 1609 const char* pending_file; 1610 int pending_line; 1611 if (HAS_PENDING_EXCEPTION) { 1612 pending_excep = PENDING_EXCEPTION; 1613 pending_file = THREAD->exception_file(); 1614 pending_line = THREAD->exception_line(); 1615 CLEAR_PENDING_EXCEPTION; 1616 } 1617 #endif /* MIGHT_HAVE_PENDING */ 1618 1619 { 1620 // Exit must be non-blocking, and therefore no exceptions can be thrown. 1621 EXCEPTION_MARK; 1622 ObjectSynchronizer::slow_exit(obj, lock, THREAD); 1623 } 1624 1625 #ifdef MIGHT_HAVE_PENDING 1626 if (pending_excep != NULL) { 1627 THREAD->set_pending_exception(pending_excep, pending_file, pending_line); 1628 } 1629 #endif /* MIGHT_HAVE_PENDING */ 1630 JRT_END 1631 1632 #ifndef PRODUCT 1633 1634 void SharedRuntime::print_statistics() { 1635 ttyLocker ttyl; 1636 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'"); 1637 1638 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr); 1639 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr); 1640 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr); 1641 1642 SharedRuntime::print_ic_miss_histogram(); 1643 1644 if (CountRemovableExceptions) { 1645 if (_nof_removable_exceptions > 0) { 1646 Unimplemented(); // this counter is not yet incremented 1647 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions); 1648 } 1649 } 1650 1651 // Dump the JRT_ENTRY counters 1652 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr); 1653 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr); 1654 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr); 1655 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr); 1656 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr); 1657 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr); 1658 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr); 1659 1660 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr ); 1661 tty->print_cr("%5d wrong method", _wrong_method_ctr ); 1662 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr ); 1663 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr ); 1664 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr ); 1665 1666 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr ); 1667 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr ); 1668 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr ); 1669 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr ); 1670 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr ); 1671 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr ); 1672 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr ); 1673 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr ); 1674 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr ); 1675 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr ); 1676 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr ); 1677 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr ); 1678 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr ); 1679 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr ); 1680 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr ); 1681 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr ); 1682 1683 AdapterHandlerLibrary::print_statistics(); 1684 1685 if (xtty != NULL) xtty->tail("statistics"); 1686 } 1687 1688 inline double percent(int x, int y) { 1689 return 100.0 * x / MAX2(y, 1); 1690 } 1691 1692 class MethodArityHistogram { 1693 public: 1694 enum { MAX_ARITY = 256 }; 1695 private: 1696 static int _arity_histogram[MAX_ARITY]; // histogram of #args 1697 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words 1698 static int _max_arity; // max. arity seen 1699 static int _max_size; // max. arg size seen 1700 1701 static void add_method_to_histogram(nmethod* nm) { 1702 methodOop m = nm->method(); 1703 ArgumentCount args(m->signature()); 1704 int arity = args.size() + (m->is_static() ? 0 : 1); 1705 int argsize = m->size_of_parameters(); 1706 arity = MIN2(arity, MAX_ARITY-1); 1707 argsize = MIN2(argsize, MAX_ARITY-1); 1708 int count = nm->method()->compiled_invocation_count(); 1709 _arity_histogram[arity] += count; 1710 _size_histogram[argsize] += count; 1711 _max_arity = MAX2(_max_arity, arity); 1712 _max_size = MAX2(_max_size, argsize); 1713 } 1714 1715 void print_histogram_helper(int n, int* histo, const char* name) { 1716 const int N = MIN2(5, n); 1717 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 1718 double sum = 0; 1719 double weighted_sum = 0; 1720 int i; 1721 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; } 1722 double rest = sum; 1723 double percent = sum / 100; 1724 for (i = 0; i <= N; i++) { 1725 rest -= histo[i]; 1726 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent); 1727 } 1728 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent); 1729 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n); 1730 } 1731 1732 void print_histogram() { 1733 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); 1734 print_histogram_helper(_max_arity, _arity_histogram, "arity"); 1735 tty->print_cr("\nSame for parameter size (in words):"); 1736 print_histogram_helper(_max_size, _size_histogram, "size"); 1737 tty->cr(); 1738 } 1739 1740 public: 1741 MethodArityHistogram() { 1742 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1743 _max_arity = _max_size = 0; 1744 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0; 1745 CodeCache::nmethods_do(add_method_to_histogram); 1746 print_histogram(); 1747 } 1748 }; 1749 1750 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY]; 1751 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY]; 1752 int MethodArityHistogram::_max_arity; 1753 int MethodArityHistogram::_max_size; 1754 1755 void SharedRuntime::print_call_statistics(int comp_total) { 1756 tty->print_cr("Calls from compiled code:"); 1757 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls; 1758 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls; 1759 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls; 1760 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total)); 1761 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total)); 1762 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls)); 1763 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls)); 1764 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls)); 1765 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls)); 1766 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total)); 1767 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls)); 1768 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls)); 1769 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls)); 1770 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls)); 1771 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total)); 1772 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls)); 1773 tty->cr(); 1774 tty->print_cr("Note 1: counter updates are not MT-safe."); 1775 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;"); 1776 tty->print_cr(" %% in nested categories are relative to their category"); 1777 tty->print_cr(" (and thus add up to more than 100%% with inlining)"); 1778 tty->cr(); 1779 1780 MethodArityHistogram h; 1781 } 1782 #endif 1783 1784 1785 // A simple wrapper class around the calling convention information 1786 // that allows sharing of adapters for the same calling convention. 1787 class AdapterFingerPrint : public CHeapObj { 1788 private: 1789 union { 1790 signed char _compact[12]; 1791 int _compact_int[3]; 1792 intptr_t* _fingerprint; 1793 } _value; 1794 int _length; // A negative length indicates that _value._fingerprint is the array. 1795 // Otherwise it's in the compact form. 1796 1797 public: 1798 AdapterFingerPrint(int total_args_passed, VMRegPair* regs) { 1799 assert(sizeof(_value._compact) == sizeof(_value._compact_int), "must match"); 1800 _length = total_args_passed * 2; 1801 if (_length < (int)sizeof(_value._compact)) { 1802 _value._compact_int[0] = _value._compact_int[1] = _value._compact_int[2] = 0; 1803 // Storing the signature encoded as signed chars hits about 98% 1804 // of the time. 1805 signed char* ptr = _value._compact; 1806 int o = 0; 1807 for (int i = 0; i < total_args_passed; i++) { 1808 VMRegPair pair = regs[i]; 1809 intptr_t v1 = pair.first()->value(); 1810 intptr_t v2 = pair.second()->value(); 1811 if (v1 == (signed char) v1 && 1812 v2 == (signed char) v2) { 1813 _value._compact[o++] = v1; 1814 _value._compact[o++] = v2; 1815 } else { 1816 goto big; 1817 } 1818 } 1819 _length = -_length; 1820 return; 1821 } 1822 big: 1823 _value._fingerprint = NEW_C_HEAP_ARRAY(intptr_t, _length); 1824 int o = 0; 1825 for (int i = 0; i < total_args_passed; i++) { 1826 VMRegPair pair = regs[i]; 1827 intptr_t v1 = pair.first()->value(); 1828 intptr_t v2 = pair.second()->value(); 1829 _value._fingerprint[o++] = v1; 1830 _value._fingerprint[o++] = v2; 1831 } 1832 } 1833 1834 AdapterFingerPrint(AdapterFingerPrint* orig) { 1835 _length = orig->_length; 1836 _value = orig->_value; 1837 // take ownership of any storage by destroying the length 1838 orig->_length = 0; 1839 } 1840 1841 ~AdapterFingerPrint() { 1842 if (_length > 0) { 1843 FREE_C_HEAP_ARRAY(int, _value._fingerprint); 1844 } 1845 } 1846 1847 AdapterFingerPrint* allocate() { 1848 return new AdapterFingerPrint(this); 1849 } 1850 1851 intptr_t value(int index) { 1852 if (_length < 0) { 1853 return _value._compact[index]; 1854 } 1855 return _value._fingerprint[index]; 1856 } 1857 int length() { 1858 if (_length < 0) return -_length; 1859 return _length; 1860 } 1861 1862 bool is_compact() { 1863 return _length <= 0; 1864 } 1865 1866 unsigned int compute_hash() { 1867 intptr_t hash = 0; 1868 for (int i = 0; i < length(); i++) { 1869 intptr_t v = value(i); 1870 hash = (hash << 8) ^ v ^ (hash >> 5); 1871 } 1872 return (unsigned int)hash; 1873 } 1874 1875 const char* as_string() { 1876 stringStream st; 1877 for (int i = 0; i < length(); i++) { 1878 st.print(PTR_FORMAT, value(i)); 1879 } 1880 return st.as_string(); 1881 } 1882 1883 bool equals(AdapterFingerPrint* other) { 1884 if (other->_length != _length) { 1885 return false; 1886 } 1887 if (_length < 0) { 1888 return _value._compact_int[0] == other->_value._compact_int[0] && 1889 _value._compact_int[1] == other->_value._compact_int[1] && 1890 _value._compact_int[2] == other->_value._compact_int[2]; 1891 } else { 1892 for (int i = 0; i < _length; i++) { 1893 if (_value._fingerprint[i] != other->_value._fingerprint[i]) { 1894 return false; 1895 } 1896 } 1897 } 1898 return true; 1899 } 1900 }; 1901 1902 1903 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries 1904 class AdapterHandlerTable : public BasicHashtable { 1905 friend class AdapterHandlerTableIterator; 1906 1907 private: 1908 1909 #ifdef ASSERT 1910 static int _lookups; // number of calls to lookup 1911 static int _buckets; // number of buckets checked 1912 static int _equals; // number of buckets checked with matching hash 1913 static int _hits; // number of successful lookups 1914 static int _compact; // number of equals calls with compact signature 1915 #endif 1916 1917 AdapterHandlerEntry* bucket(int i) { 1918 return (AdapterHandlerEntry*)BasicHashtable::bucket(i); 1919 } 1920 1921 public: 1922 AdapterHandlerTable() 1923 : BasicHashtable(293, sizeof(AdapterHandlerEntry)) { } 1924 1925 // Create a new entry suitable for insertion in the table 1926 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 1927 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable::new_entry(fingerprint->compute_hash()); 1928 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 1929 return entry; 1930 } 1931 1932 // Insert an entry into the table 1933 void add(AdapterHandlerEntry* entry) { 1934 int index = hash_to_index(entry->hash()); 1935 add_entry(index, entry); 1936 } 1937 1938 // Find a entry with the same fingerprint if it exists 1939 AdapterHandlerEntry* lookup(int total_args_passed, VMRegPair* regs) { 1940 debug_only(_lookups++); 1941 AdapterFingerPrint fp(total_args_passed, regs); 1942 unsigned int hash = fp.compute_hash(); 1943 int index = hash_to_index(hash); 1944 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 1945 debug_only(_buckets++); 1946 if (e->hash() == hash) { 1947 debug_only(_equals++); 1948 if (fp.equals(e->fingerprint())) { 1949 #ifdef ASSERT 1950 if (fp.is_compact()) _compact++; 1951 _hits++; 1952 #endif 1953 return e; 1954 } 1955 } 1956 } 1957 return NULL; 1958 } 1959 1960 void print_statistics() { 1961 ResourceMark rm; 1962 int longest = 0; 1963 int empty = 0; 1964 int total = 0; 1965 int nonempty = 0; 1966 for (int index = 0; index < table_size(); index++) { 1967 int count = 0; 1968 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { 1969 count++; 1970 } 1971 if (count != 0) nonempty++; 1972 if (count == 0) empty++; 1973 if (count > longest) longest = count; 1974 total += count; 1975 } 1976 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f", 1977 empty, longest, total, total / (double)nonempty); 1978 #ifdef ASSERT 1979 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d", 1980 _lookups, _buckets, _equals, _hits, _compact); 1981 #endif 1982 } 1983 }; 1984 1985 1986 #ifdef ASSERT 1987 1988 int AdapterHandlerTable::_lookups; 1989 int AdapterHandlerTable::_buckets; 1990 int AdapterHandlerTable::_equals; 1991 int AdapterHandlerTable::_hits; 1992 int AdapterHandlerTable::_compact; 1993 1994 class AdapterHandlerTableIterator : public StackObj { 1995 private: 1996 AdapterHandlerTable* _table; 1997 int _index; 1998 AdapterHandlerEntry* _current; 1999 2000 void scan() { 2001 while (_index < _table->table_size()) { 2002 AdapterHandlerEntry* a = _table->bucket(_index); 2003 if (a != NULL) { 2004 _current = a; 2005 return; 2006 } 2007 _index++; 2008 } 2009 } 2010 2011 public: 2012 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) { 2013 scan(); 2014 } 2015 bool has_next() { 2016 return _current != NULL; 2017 } 2018 AdapterHandlerEntry* next() { 2019 if (_current != NULL) { 2020 AdapterHandlerEntry* result = _current; 2021 _current = _current->next(); 2022 if (_current == NULL) scan(); 2023 return result; 2024 } else { 2025 return NULL; 2026 } 2027 } 2028 }; 2029 #endif 2030 2031 2032 // --------------------------------------------------------------------------- 2033 // Implementation of AdapterHandlerLibrary 2034 const char* AdapterHandlerEntry::name = "I2C/C2I adapters"; 2035 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL; 2036 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL; 2037 const int AdapterHandlerLibrary_size = 16*K; 2038 BufferBlob* AdapterHandlerLibrary::_buffer = NULL; 2039 2040 BufferBlob* AdapterHandlerLibrary::buffer_blob() { 2041 // Should be called only when AdapterHandlerLibrary_lock is active. 2042 if (_buffer == NULL) // Initialize lazily 2043 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size); 2044 return _buffer; 2045 } 2046 2047 void AdapterHandlerLibrary::initialize() { 2048 if (_adapters != NULL) return; 2049 _adapters = new AdapterHandlerTable(); 2050 2051 // Create a special handler for abstract methods. Abstract methods 2052 // are never compiled so an i2c entry is somewhat meaningless, but 2053 // fill it in with something appropriate just in case. Pass handle 2054 // wrong method for the c2i transitions. 2055 address wrong_method = SharedRuntime::get_handle_wrong_method_stub(); 2056 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL), 2057 StubRoutines::throw_AbstractMethodError_entry(), 2058 wrong_method, wrong_method); 2059 } 2060 2061 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint, 2062 address i2c_entry, 2063 address c2i_entry, 2064 address c2i_unverified_entry) { 2065 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 2066 } 2067 2068 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(methodHandle method) { 2069 // Use customized signature handler. Need to lock around updates to 2070 // the AdapterHandlerTable (it is not safe for concurrent readers 2071 // and a single writer: this could be fixed if it becomes a 2072 // problem). 2073 2074 // Get the address of the ic_miss handlers before we grab the 2075 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which 2076 // was caused by the initialization of the stubs happening 2077 // while we held the lock and then notifying jvmti while 2078 // holding it. This just forces the initialization to be a little 2079 // earlier. 2080 address ic_miss = SharedRuntime::get_ic_miss_stub(); 2081 assert(ic_miss != NULL, "must have handler"); 2082 2083 ResourceMark rm; 2084 2085 NOT_PRODUCT(int code_size); 2086 BufferBlob *B = NULL; 2087 AdapterHandlerEntry* entry = NULL; 2088 AdapterFingerPrint* fingerprint = NULL; 2089 { 2090 MutexLocker mu(AdapterHandlerLibrary_lock); 2091 // make sure data structure is initialized 2092 initialize(); 2093 2094 if (method->is_abstract()) { 2095 return _abstract_method_handler; 2096 } 2097 2098 // Fill in the signature array, for the calling-convention call. 2099 int total_args_passed = method->size_of_parameters(); // All args on stack 2100 2101 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2102 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2103 int i = 0; 2104 if (!method->is_static()) // Pass in receiver first 2105 sig_bt[i++] = T_OBJECT; 2106 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) { 2107 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2108 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) 2109 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2110 } 2111 assert(i == total_args_passed, ""); 2112 2113 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage 2114 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); 2115 2116 // Lookup method signature's fingerprint 2117 entry = _adapters->lookup(total_args_passed, regs); 2118 if (entry != NULL) { 2119 return entry; 2120 } 2121 2122 // Make a C heap allocated version of the fingerprint to store in the adapter 2123 fingerprint = new AdapterFingerPrint(total_args_passed, regs); 2124 2125 // Create I2C & C2I handlers 2126 2127 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2128 if (buf != NULL) { 2129 CodeBuffer buffer(buf->instructions_begin(), buf->instructions_size()); 2130 short buffer_locs[20]; 2131 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs, 2132 sizeof(buffer_locs)/sizeof(relocInfo)); 2133 MacroAssembler _masm(&buffer); 2134 2135 entry = SharedRuntime::generate_i2c2i_adapters(&_masm, 2136 total_args_passed, 2137 comp_args_on_stack, 2138 sig_bt, 2139 regs, 2140 fingerprint); 2141 2142 B = BufferBlob::create(AdapterHandlerEntry::name, &buffer); 2143 NOT_PRODUCT(code_size = buffer.code_size()); 2144 } 2145 if (B == NULL) { 2146 // CodeCache is full, disable compilation 2147 // Ought to log this but compile log is only per compile thread 2148 // and we're some non descript Java thread. 2149 MutexUnlocker mu(AdapterHandlerLibrary_lock); 2150 CompileBroker::handle_full_code_cache(); 2151 return NULL; // Out of CodeCache space 2152 } 2153 entry->relocate(B->instructions_begin()); 2154 #ifndef PRODUCT 2155 // debugging suppport 2156 if (PrintAdapterHandlers) { 2157 tty->cr(); 2158 tty->print_cr("i2c argument handler #%d for: %s %s (fingerprint = %s, %d bytes generated)", 2159 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"), 2160 method->signature()->as_C_string(), fingerprint->as_string(), code_size ); 2161 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry()); 2162 Disassembler::decode(entry->get_i2c_entry(), entry->get_i2c_entry() + code_size); 2163 } 2164 #endif 2165 2166 _adapters->add(entry); 2167 } 2168 // Outside of the lock 2169 if (B != NULL) { 2170 char blob_id[256]; 2171 jio_snprintf(blob_id, 2172 sizeof(blob_id), 2173 "%s(%s)@" PTR_FORMAT, 2174 AdapterHandlerEntry::name, 2175 fingerprint->as_string(), 2176 B->instructions_begin()); 2177 VTune::register_stub(blob_id, B->instructions_begin(), B->instructions_end()); 2178 Forte::register_stub(blob_id, B->instructions_begin(), B->instructions_end()); 2179 2180 if (JvmtiExport::should_post_dynamic_code_generated()) { 2181 JvmtiExport::post_dynamic_code_generated(blob_id, 2182 B->instructions_begin(), 2183 B->instructions_end()); 2184 } 2185 } 2186 return entry; 2187 } 2188 2189 void AdapterHandlerEntry::relocate(address new_base) { 2190 ptrdiff_t delta = new_base - _i2c_entry; 2191 _i2c_entry += delta; 2192 _c2i_entry += delta; 2193 _c2i_unverified_entry += delta; 2194 } 2195 2196 // Create a native wrapper for this native method. The wrapper converts the 2197 // java compiled calling convention to the native convention, handlizes 2198 // arguments, and transitions to native. On return from the native we transition 2199 // back to java blocking if a safepoint is in progress. 2200 nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method) { 2201 ResourceMark rm; 2202 nmethod* nm = NULL; 2203 2204 if (PrintCompilation) { 2205 ttyLocker ttyl; 2206 tty->print("--- n%s ", (method->is_synchronized() ? "s" : " ")); 2207 method->print_short_name(tty); 2208 if (method->is_static()) { 2209 tty->print(" (static)"); 2210 } 2211 tty->cr(); 2212 } 2213 2214 assert(method->has_native_function(), "must have something valid to call!"); 2215 2216 { 2217 // perform the work while holding the lock, but perform any printing outside the lock 2218 MutexLocker mu(AdapterHandlerLibrary_lock); 2219 // See if somebody beat us to it 2220 nm = method->code(); 2221 if (nm) { 2222 return nm; 2223 } 2224 2225 ResourceMark rm; 2226 2227 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2228 if (buf != NULL) { 2229 CodeBuffer buffer(buf->instructions_begin(), buf->instructions_size()); 2230 double locs_buf[20]; 2231 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); 2232 MacroAssembler _masm(&buffer); 2233 2234 // Fill in the signature array, for the calling-convention call. 2235 int total_args_passed = method->size_of_parameters(); 2236 2237 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType,total_args_passed); 2238 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair,total_args_passed); 2239 int i=0; 2240 if( !method->is_static() ) // Pass in receiver first 2241 sig_bt[i++] = T_OBJECT; 2242 SignatureStream ss(method->signature()); 2243 for( ; !ss.at_return_type(); ss.next()) { 2244 sig_bt[i++] = ss.type(); // Collect remaining bits of signature 2245 if( ss.type() == T_LONG || ss.type() == T_DOUBLE ) 2246 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2247 } 2248 assert( i==total_args_passed, "" ); 2249 BasicType ret_type = ss.type(); 2250 2251 // Now get the compiled-Java layout as input arguments 2252 int comp_args_on_stack; 2253 comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); 2254 2255 // Generate the compiled-to-native wrapper code 2256 nm = SharedRuntime::generate_native_wrapper(&_masm, 2257 method, 2258 total_args_passed, 2259 comp_args_on_stack, 2260 sig_bt,regs, 2261 ret_type); 2262 } 2263 } 2264 2265 // Must unlock before calling set_code 2266 // Install the generated code. 2267 if (nm != NULL) { 2268 method->set_code(method, nm); 2269 nm->post_compiled_method_load_event(); 2270 } else { 2271 // CodeCache is full, disable compilation 2272 // Ought to log this but compile log is only per compile thread 2273 // and we're some non descript Java thread. 2274 MutexUnlocker mu(AdapterHandlerLibrary_lock); 2275 CompileBroker::handle_full_code_cache(); 2276 } 2277 return nm; 2278 } 2279 2280 #ifdef HAVE_DTRACE_H 2281 // Create a dtrace nmethod for this method. The wrapper converts the 2282 // java compiled calling convention to the native convention, makes a dummy call 2283 // (actually nops for the size of the call instruction, which become a trap if 2284 // probe is enabled). The returns to the caller. Since this all looks like a 2285 // leaf no thread transition is needed. 2286 2287 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) { 2288 ResourceMark rm; 2289 nmethod* nm = NULL; 2290 2291 if (PrintCompilation) { 2292 ttyLocker ttyl; 2293 tty->print("--- n%s "); 2294 method->print_short_name(tty); 2295 if (method->is_static()) { 2296 tty->print(" (static)"); 2297 } 2298 tty->cr(); 2299 } 2300 2301 { 2302 // perform the work while holding the lock, but perform any printing 2303 // outside the lock 2304 MutexLocker mu(AdapterHandlerLibrary_lock); 2305 // See if somebody beat us to it 2306 nm = method->code(); 2307 if (nm) { 2308 return nm; 2309 } 2310 2311 ResourceMark rm; 2312 2313 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache 2314 if (buf != NULL) { 2315 CodeBuffer buffer(buf->instructions_begin(), buf->instructions_size()); 2316 // Need a few relocation entries 2317 double locs_buf[20]; 2318 buffer.insts()->initialize_shared_locs( 2319 (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); 2320 MacroAssembler _masm(&buffer); 2321 2322 // Generate the compiled-to-native wrapper code 2323 nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method); 2324 } 2325 } 2326 return nm; 2327 } 2328 2329 // the dtrace method needs to convert java lang string to utf8 string. 2330 void SharedRuntime::get_utf(oopDesc* src, address dst) { 2331 typeArrayOop jlsValue = java_lang_String::value(src); 2332 int jlsOffset = java_lang_String::offset(src); 2333 int jlsLen = java_lang_String::length(src); 2334 jchar* jlsPos = (jlsLen == 0) ? NULL : 2335 jlsValue->char_at_addr(jlsOffset); 2336 (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size); 2337 } 2338 #endif // ndef HAVE_DTRACE_H 2339 2340 // ------------------------------------------------------------------------- 2341 // Java-Java calling convention 2342 // (what you use when Java calls Java) 2343 2344 //------------------------------name_for_receiver---------------------------------- 2345 // For a given signature, return the VMReg for parameter 0. 2346 VMReg SharedRuntime::name_for_receiver() { 2347 VMRegPair regs; 2348 BasicType sig_bt = T_OBJECT; 2349 (void) java_calling_convention(&sig_bt, ®s, 1, true); 2350 // Return argument 0 register. In the LP64 build pointers 2351 // take 2 registers, but the VM wants only the 'main' name. 2352 return regs.first(); 2353 } 2354 2355 VMRegPair *SharedRuntime::find_callee_arguments(symbolOop sig, bool has_receiver, int* arg_size) { 2356 // This method is returning a data structure allocating as a 2357 // ResourceObject, so do not put any ResourceMarks in here. 2358 char *s = sig->as_C_string(); 2359 int len = (int)strlen(s); 2360 *s++; len--; // Skip opening paren 2361 char *t = s+len; 2362 while( *(--t) != ')' ) ; // Find close paren 2363 2364 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 ); 2365 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 ); 2366 int cnt = 0; 2367 if (has_receiver) { 2368 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature 2369 } 2370 2371 while( s < t ) { 2372 switch( *s++ ) { // Switch on signature character 2373 case 'B': sig_bt[cnt++] = T_BYTE; break; 2374 case 'C': sig_bt[cnt++] = T_CHAR; break; 2375 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break; 2376 case 'F': sig_bt[cnt++] = T_FLOAT; break; 2377 case 'I': sig_bt[cnt++] = T_INT; break; 2378 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break; 2379 case 'S': sig_bt[cnt++] = T_SHORT; break; 2380 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break; 2381 case 'V': sig_bt[cnt++] = T_VOID; break; 2382 case 'L': // Oop 2383 while( *s++ != ';' ) ; // Skip signature 2384 sig_bt[cnt++] = T_OBJECT; 2385 break; 2386 case '[': { // Array 2387 do { // Skip optional size 2388 while( *s >= '0' && *s <= '9' ) s++; 2389 } while( *s++ == '[' ); // Nested arrays? 2390 // Skip element type 2391 if( s[-1] == 'L' ) 2392 while( *s++ != ';' ) ; // Skip signature 2393 sig_bt[cnt++] = T_ARRAY; 2394 break; 2395 } 2396 default : ShouldNotReachHere(); 2397 } 2398 } 2399 assert( cnt < 256, "grow table size" ); 2400 2401 int comp_args_on_stack; 2402 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true); 2403 2404 // the calling convention doesn't count out_preserve_stack_slots so 2405 // we must add that in to get "true" stack offsets. 2406 2407 if (comp_args_on_stack) { 2408 for (int i = 0; i < cnt; i++) { 2409 VMReg reg1 = regs[i].first(); 2410 if( reg1->is_stack()) { 2411 // Yuck 2412 reg1 = reg1->bias(out_preserve_stack_slots()); 2413 } 2414 VMReg reg2 = regs[i].second(); 2415 if( reg2->is_stack()) { 2416 // Yuck 2417 reg2 = reg2->bias(out_preserve_stack_slots()); 2418 } 2419 regs[i].set_pair(reg2, reg1); 2420 } 2421 } 2422 2423 // results 2424 *arg_size = cnt; 2425 return regs; 2426 } 2427 2428 // OSR Migration Code 2429 // 2430 // This code is used convert interpreter frames into compiled frames. It is 2431 // called from very start of a compiled OSR nmethod. A temp array is 2432 // allocated to hold the interesting bits of the interpreter frame. All 2433 // active locks are inflated to allow them to move. The displaced headers and 2434 // active interpeter locals are copied into the temp buffer. Then we return 2435 // back to the compiled code. The compiled code then pops the current 2436 // interpreter frame off the stack and pushes a new compiled frame. Then it 2437 // copies the interpreter locals and displaced headers where it wants. 2438 // Finally it calls back to free the temp buffer. 2439 // 2440 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed. 2441 2442 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) ) 2443 2444 #ifdef IA64 2445 ShouldNotReachHere(); // NYI 2446 #endif /* IA64 */ 2447 2448 // 2449 // This code is dependent on the memory layout of the interpreter local 2450 // array and the monitors. On all of our platforms the layout is identical 2451 // so this code is shared. If some platform lays the their arrays out 2452 // differently then this code could move to platform specific code or 2453 // the code here could be modified to copy items one at a time using 2454 // frame accessor methods and be platform independent. 2455 2456 frame fr = thread->last_frame(); 2457 assert( fr.is_interpreted_frame(), "" ); 2458 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" ); 2459 2460 // Figure out how many monitors are active. 2461 int active_monitor_count = 0; 2462 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 2463 kptr < fr.interpreter_frame_monitor_begin(); 2464 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 2465 if( kptr->obj() != NULL ) active_monitor_count++; 2466 } 2467 2468 // QQQ we could place number of active monitors in the array so that compiled code 2469 // could double check it. 2470 2471 methodOop moop = fr.interpreter_frame_method(); 2472 int max_locals = moop->max_locals(); 2473 // Allocate temp buffer, 1 word per local & 2 per active monitor 2474 int buf_size_words = max_locals + active_monitor_count*2; 2475 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words); 2476 2477 // Copy the locals. Order is preserved so that loading of longs works. 2478 // Since there's no GC I can copy the oops blindly. 2479 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code"); 2480 if (TaggedStackInterpreter) { 2481 for (int i = 0; i < max_locals; i++) { 2482 // copy only each local separately to the buffer avoiding the tag 2483 buf[i] = *fr.interpreter_frame_local_at(max_locals-i-1); 2484 } 2485 } else { 2486 Copy::disjoint_words( 2487 (HeapWord*)fr.interpreter_frame_local_at(max_locals-1), 2488 (HeapWord*)&buf[0], 2489 max_locals); 2490 } 2491 2492 // Inflate locks. Copy the displaced headers. Be careful, there can be holes. 2493 int i = max_locals; 2494 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end(); 2495 kptr2 < fr.interpreter_frame_monitor_begin(); 2496 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) { 2497 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array 2498 BasicLock *lock = kptr2->lock(); 2499 // Inflate so the displaced header becomes position-independent 2500 if (lock->displaced_header()->is_unlocked()) 2501 ObjectSynchronizer::inflate_helper(kptr2->obj()); 2502 // Now the displaced header is free to move 2503 buf[i++] = (intptr_t)lock->displaced_header(); 2504 buf[i++] = (intptr_t)kptr2->obj(); 2505 } 2506 } 2507 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" ); 2508 2509 return buf; 2510 JRT_END 2511 2512 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) ) 2513 FREE_C_HEAP_ARRAY(intptr_t,buf); 2514 JRT_END 2515 2516 #ifndef PRODUCT 2517 bool AdapterHandlerLibrary::contains(CodeBlob* b) { 2518 AdapterHandlerTableIterator iter(_adapters); 2519 while (iter.has_next()) { 2520 AdapterHandlerEntry* a = iter.next(); 2521 if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) return true; 2522 } 2523 return false; 2524 } 2525 2526 void AdapterHandlerLibrary::print_handler(CodeBlob* b) { 2527 AdapterHandlerTableIterator iter(_adapters); 2528 while (iter.has_next()) { 2529 AdapterHandlerEntry* a = iter.next(); 2530 if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) { 2531 tty->print("Adapter for signature: "); 2532 tty->print_cr("%s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT, 2533 a->fingerprint()->as_string(), 2534 a->get_i2c_entry(), a->get_c2i_entry(), a->get_c2i_unverified_entry()); 2535 return; 2536 } 2537 } 2538 assert(false, "Should have found handler"); 2539 } 2540 2541 void AdapterHandlerLibrary::print_statistics() { 2542 _adapters->print_statistics(); 2543 } 2544 2545 #endif /* PRODUCT */