1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP 26 #define SHARE_VM_OOPS_METHODOOP_HPP 27 28 #include "classfile/vmSymbols.hpp" 29 #include "code/compressedStream.hpp" 30 #include "compiler/oopMap.hpp" 31 #include "interpreter/invocationCounter.hpp" 32 #include "oops/annotations.hpp" 33 #include "oops/constantPool.hpp" 34 #include "oops/methodCounters.hpp" 35 #include "oops/instanceKlass.hpp" 36 #include "oops/oop.hpp" 37 #include "oops/typeArrayOop.hpp" 38 #include "utilities/accessFlags.hpp" 39 #include "utilities/growableArray.hpp" 40 41 // A Method represents a Java method. 42 // 43 // Note that most applications load thousands of methods, so keeping the size of this 44 // class small has a big impact on footprint. 45 // 46 // Note that native_function and signature_handler have to be at fixed offsets 47 // (required by the interpreter) 48 // 49 // Method embedded field layout (after declared fields): 50 // [EMBEDDED native_function (present only if native) ] 51 // [EMBEDDED signature_handler (present only if native) ] 52 53 class CheckedExceptionElement; 54 class LocalVariableTableElement; 55 class AdapterHandlerEntry; 56 class MethodData; 57 class MethodCounters; 58 class ConstMethod; 59 class InlineTableSizes; 60 class KlassSizeStats; 61 62 class Method : public Metadata { 63 friend class VMStructs; 64 friend class JVMCIVMStructs; 65 private: 66 ConstMethod* _constMethod; // Method read-only data. 67 MethodData* _method_data; 68 MethodCounters* _method_counters; 69 AccessFlags _access_flags; // Access flags 70 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 71 // note: can have vtables with >2**16 elements (because of inheritance) 72 #ifdef CC_INTERP 73 int _result_index; // C++ interpreter needs for converting results to/from stack 74 #endif 75 u2 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 76 77 // Flags 78 enum Flags { 79 _jfr_towrite = 1 << 0, 80 _caller_sensitive = 1 << 1, 81 _force_inline = 1 << 2, 82 _dont_inline = 1 << 3, 83 _hidden = 1 << 4, 84 _has_injected_profile = 1 << 5, 85 _running_emcp = 1 << 6, 86 _intrinsic_candidate = 1 << 7, 87 _reserved_stack_access = 1 << 8 88 }; 89 mutable u2 _flags; 90 91 #ifndef PRODUCT 92 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 93 #endif 94 // Entry point for calling both from and to the interpreter. 95 address _i2i_entry; // All-args-on-stack calling convention 96 // Entry point for calling from compiled code, to compiled code if it exists 97 // or else the interpreter. 98 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 99 // The entry point for calling both from and to compiled code is 100 // "_code->entry_point()". Because of tiered compilation and de-opt, this 101 // field can come and go. It can transition from NULL to not-null at any 102 // time (whenever a compile completes). It can transition from not-null to 103 // NULL only at safepoints (because of a de-opt). 104 nmethod* volatile _code; // Points to the corresponding piece of native code 105 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 106 107 // Constructor 108 Method(ConstMethod* xconst, AccessFlags access_flags); 109 public: 110 111 static Method* allocate(ClassLoaderData* loader_data, 112 int byte_code_size, 113 AccessFlags access_flags, 114 InlineTableSizes* sizes, 115 ConstMethod::MethodType method_type, 116 TRAPS); 117 118 // CDS and vtbl checking can create an empty Method to get vtbl pointer. 119 Method(){} 120 121 // The Method vtable is restored by this call when the Method is in the 122 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for 123 // all the gory details. SA, dtrace and pstack helpers distinguish metadata 124 // by their vtable. 125 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); } 126 bool is_method() const volatile { return true; } 127 128 void restore_unshareable_info(TRAPS); 129 130 // accessors for instance variables 131 132 ConstMethod* constMethod() const { return _constMethod; } 133 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; } 134 135 136 static address make_adapters(methodHandle mh, TRAPS); 137 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 138 volatile address from_compiled_entry_no_trampoline() const; 139 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 140 141 // access flag 142 AccessFlags access_flags() const { return _access_flags; } 143 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 144 145 // name 146 Symbol* name() const { return constants()->symbol_at(name_index()); } 147 int name_index() const { return constMethod()->name_index(); } 148 void set_name_index(int index) { constMethod()->set_name_index(index); } 149 150 // signature 151 Symbol* signature() const { return constants()->symbol_at(signature_index()); } 152 int signature_index() const { return constMethod()->signature_index(); } 153 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 154 155 // generics support 156 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); } 157 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 158 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 159 160 // annotations support 161 AnnotationArray* annotations() const { 162 return constMethod()->method_annotations(); 163 } 164 AnnotationArray* parameter_annotations() const { 165 return constMethod()->parameter_annotations(); 166 } 167 AnnotationArray* annotation_default() const { 168 return constMethod()->default_annotations(); 169 } 170 AnnotationArray* type_annotations() const { 171 return constMethod()->type_annotations(); 172 } 173 174 #ifdef CC_INTERP 175 void set_result_index(BasicType type); 176 int result_index() { return _result_index; } 177 #endif 178 179 // Helper routine: get klass name + "." + method name + signature as 180 // C string, for the purpose of providing more useful NoSuchMethodErrors 181 // and fatal error handling. The string is allocated in resource 182 // area if a buffer is not provided by the caller. 183 char* name_and_sig_as_C_string() const; 184 char* name_and_sig_as_C_string(char* buf, int size) const; 185 186 // Static routine in the situations we don't have a Method* 187 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); 188 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); 189 190 Bytecodes::Code java_code_at(int bci) const { 191 return Bytecodes::java_code_at(this, bcp_from(bci)); 192 } 193 Bytecodes::Code code_at(int bci) const { 194 return Bytecodes::code_at(this, bcp_from(bci)); 195 } 196 197 // JVMTI breakpoints 198 Bytecodes::Code orig_bytecode_at(int bci) const; 199 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 200 void set_breakpoint(int bci); 201 void clear_breakpoint(int bci); 202 void clear_all_breakpoints(); 203 // Tracking number of breakpoints, for fullspeed debugging. 204 // Only mutated by VM thread. 205 u2 number_of_breakpoints() const { 206 MethodCounters* mcs = method_counters(); 207 if (mcs == NULL) { 208 return 0; 209 } else { 210 return mcs->number_of_breakpoints(); 211 } 212 } 213 void incr_number_of_breakpoints(TRAPS) { 214 MethodCounters* mcs = get_method_counters(CHECK); 215 if (mcs != NULL) { 216 mcs->incr_number_of_breakpoints(); 217 } 218 } 219 void decr_number_of_breakpoints(TRAPS) { 220 MethodCounters* mcs = get_method_counters(CHECK); 221 if (mcs != NULL) { 222 mcs->decr_number_of_breakpoints(); 223 } 224 } 225 // Initialization only 226 void clear_number_of_breakpoints() { 227 MethodCounters* mcs = method_counters(); 228 if (mcs != NULL) { 229 mcs->clear_number_of_breakpoints(); 230 } 231 } 232 233 // index into InstanceKlass methods() array 234 // note: also used by jfr 235 u2 method_idnum() const { return constMethod()->method_idnum(); } 236 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 237 238 u2 orig_method_idnum() const { return constMethod()->orig_method_idnum(); } 239 void set_orig_method_idnum(u2 idnum) { constMethod()->set_orig_method_idnum(idnum); } 240 241 // code size 242 int code_size() const { return constMethod()->code_size(); } 243 244 // method size in words 245 int method_size() const { return sizeof(Method)/wordSize + is_native() ? 2 : 0; } 246 247 // constant pool for Klass* holding this method 248 ConstantPool* constants() const { return constMethod()->constants(); } 249 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); } 250 251 // max stack 252 // return original max stack size for method verification 253 int verifier_max_stack() const { return constMethod()->max_stack(); } 254 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); } 255 void set_max_stack(int size) { constMethod()->set_max_stack(size); } 256 257 // max locals 258 int max_locals() const { return constMethod()->max_locals(); } 259 void set_max_locals(int size) { constMethod()->set_max_locals(size); } 260 261 int highest_comp_level() const; 262 void set_highest_comp_level(int level); 263 int highest_osr_comp_level() const; 264 void set_highest_osr_comp_level(int level); 265 266 // Count of times method was exited via exception while interpreting 267 void interpreter_throwout_increment(TRAPS) { 268 MethodCounters* mcs = get_method_counters(CHECK); 269 if (mcs != NULL) { 270 mcs->interpreter_throwout_increment(); 271 } 272 } 273 274 int interpreter_throwout_count() const { 275 MethodCounters* mcs = method_counters(); 276 if (mcs == NULL) { 277 return 0; 278 } else { 279 return mcs->interpreter_throwout_count(); 280 } 281 } 282 283 // size of parameters 284 int size_of_parameters() const { return constMethod()->size_of_parameters(); } 285 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); } 286 287 bool has_stackmap_table() const { 288 return constMethod()->has_stackmap_table(); 289 } 290 291 Array<u1>* stackmap_data() const { 292 return constMethod()->stackmap_data(); 293 } 294 295 void set_stackmap_data(Array<u1>* sd) { 296 constMethod()->set_stackmap_data(sd); 297 } 298 299 // exception handler table 300 bool has_exception_handler() const 301 { return constMethod()->has_exception_handler(); } 302 int exception_table_length() const 303 { return constMethod()->exception_table_length(); } 304 ExceptionTableElement* exception_table_start() const 305 { return constMethod()->exception_table_start(); } 306 307 // Finds the first entry point bci of an exception handler for an 308 // exception of klass ex_klass thrown at throw_bci. A value of NULL 309 // for ex_klass indicates that the exception klass is not known; in 310 // this case it matches any constraint class. Returns -1 if the 311 // exception cannot be handled in this method. The handler 312 // constraint classes are loaded if necessary. Note that this may 313 // throw an exception if loading of the constraint classes causes 314 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 315 // If an exception is thrown, returns the bci of the 316 // exception handler which caused the exception to be thrown, which 317 // is needed for proper retries. See, for example, 318 // InterpreterRuntime::exception_handler_for_exception. 319 static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS); 320 321 // method data access 322 MethodData* method_data() const { 323 return _method_data; 324 } 325 326 void set_method_data(MethodData* data) { 327 // The store into method must be released. On platforms without 328 // total store order (TSO) the reference may become visible before 329 // the initialization of data otherwise. 330 OrderAccess::release_store_ptr((volatile void *)&_method_data, data); 331 } 332 333 MethodCounters* method_counters() const { 334 return _method_counters; 335 } 336 337 void clear_method_counters() { 338 _method_counters = NULL; 339 } 340 341 bool init_method_counters(MethodCounters* counters) { 342 // Try to install a pointer to MethodCounters, return true on success. 343 return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL; 344 } 345 346 #ifdef TIERED 347 // We are reusing interpreter_invocation_count as a holder for the previous event count! 348 // We can do that since interpreter_invocation_count is not used in tiered. 349 int prev_event_count() const { 350 if (method_counters() == NULL) { 351 return 0; 352 } else { 353 return method_counters()->interpreter_invocation_count(); 354 } 355 } 356 void set_prev_event_count(int count) { 357 MethodCounters* mcs = method_counters(); 358 if (mcs != NULL) { 359 mcs->set_interpreter_invocation_count(count); 360 } 361 } 362 jlong prev_time() const { 363 MethodCounters* mcs = method_counters(); 364 return mcs == NULL ? 0 : mcs->prev_time(); 365 } 366 void set_prev_time(jlong time) { 367 MethodCounters* mcs = method_counters(); 368 if (mcs != NULL) { 369 mcs->set_prev_time(time); 370 } 371 } 372 float rate() const { 373 MethodCounters* mcs = method_counters(); 374 return mcs == NULL ? 0 : mcs->rate(); 375 } 376 void set_rate(float rate) { 377 MethodCounters* mcs = method_counters(); 378 if (mcs != NULL) { 379 mcs->set_rate(rate); 380 } 381 } 382 #endif 383 int nmethod_age() const { 384 if (method_counters() == NULL) { 385 return INT_MAX; 386 } else { 387 return method_counters()->nmethod_age(); 388 } 389 } 390 391 int invocation_count(); 392 int backedge_count(); 393 394 bool was_executed_more_than(int n); 395 bool was_never_executed() { return !was_executed_more_than(0); } 396 397 static void build_interpreter_method_data(const methodHandle& method, TRAPS); 398 399 static MethodCounters* build_method_counters(Method* m, TRAPS); 400 401 int interpreter_invocation_count() { 402 if (TieredCompilation) { 403 return invocation_count(); 404 } else { 405 MethodCounters* mcs = method_counters(); 406 return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count(); 407 } 408 } 409 int increment_interpreter_invocation_count(TRAPS) { 410 if (TieredCompilation) ShouldNotReachHere(); 411 MethodCounters* mcs = get_method_counters(CHECK_0); 412 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count(); 413 } 414 415 #ifndef PRODUCT 416 int compiled_invocation_count() const { return _compiled_invocation_count; } 417 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 418 #else 419 // for PrintMethodData in a product build 420 int compiled_invocation_count() const { return 0; } 421 #endif // not PRODUCT 422 423 // Clear (non-shared space) pointers which could not be relevant 424 // if this (shared) method were mapped into another JVM. 425 void remove_unshareable_info(); 426 427 // nmethod/verified compiler entry 428 address verified_code_entry(); 429 bool check_code() const; // Not inline to avoid circular ref 430 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 431 void clear_code(); // Clear out any compiled code 432 static void set_code(methodHandle mh, nmethod* code); 433 void set_adapter_entry(AdapterHandlerEntry* adapter) { 434 constMethod()->set_adapter_entry(adapter); 435 } 436 void update_adapter_trampoline(AdapterHandlerEntry* adapter) { 437 constMethod()->update_adapter_trampoline(adapter); 438 } 439 440 address get_i2c_entry(); 441 address get_c2i_entry(); 442 address get_c2i_unverified_entry(); 443 AdapterHandlerEntry* adapter() const { 444 return constMethod()->adapter(); 445 } 446 // setup entry points 447 void link_method(const methodHandle& method, TRAPS); 448 // clear entry points. Used by sharing code 449 void unlink_method(); 450 451 // vtable index 452 enum VtableIndexFlag { 453 // Valid vtable indexes are non-negative (>= 0). 454 // These few negative values are used as sentinels. 455 itable_index_max = -10, // first itable index, growing downward 456 pending_itable_index = -9, // itable index will be assigned 457 invalid_vtable_index = -4, // distinct from any valid vtable index 458 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 459 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 460 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 461 }; 462 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 463 bool has_vtable_index() const { return _vtable_index >= 0; } 464 int vtable_index() const { return _vtable_index; } 465 void set_vtable_index(int index) { _vtable_index = index; } 466 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; }) 467 bool has_itable_index() const { return _vtable_index <= itable_index_max; } 468 int itable_index() const { assert(valid_itable_index(), ""); 469 return itable_index_max - _vtable_index; } 470 void set_itable_index(int index) { _vtable_index = itable_index_max - index; assert(valid_itable_index(), ""); } 471 472 // interpreter entry 473 address interpreter_entry() const { return _i2i_entry; } 474 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 475 void set_interpreter_entry(address entry) { 476 if (_i2i_entry != entry) { 477 _i2i_entry = entry; 478 } 479 if (_from_interpreted_entry != entry) { 480 _from_interpreted_entry = entry; 481 } 482 } 483 484 // native function (used for native methods only) 485 enum { 486 native_bind_event_is_interesting = true 487 }; 488 address native_function() const { return *(native_function_addr()); } 489 address critical_native_function(); 490 491 // Must specify a real function (not NULL). 492 // Use clear_native_function() to unregister. 493 void set_native_function(address function, bool post_event_flag); 494 bool has_native_function() const; 495 void clear_native_function(); 496 497 // signature handler (used for native methods only) 498 address signature_handler() const { return *(signature_handler_addr()); } 499 void set_signature_handler(address handler); 500 501 // Interpreter oopmap support 502 void mask_for(int bci, InterpreterOopMap* mask); 503 504 // operations on invocation counter 505 void print_invocation_count(); 506 507 // byte codes 508 void set_code(address code) { return constMethod()->set_code(code); } 509 address code_base() const { return constMethod()->code_base(); } 510 bool contains(address bcp) const { return constMethod()->contains(bcp); } 511 512 // prints byte codes 513 void print_codes() const { print_codes_on(tty); } 514 void print_codes_on(outputStream* st) const; 515 void print_codes_on(int from, int to, outputStream* st) const; 516 517 // method parameters 518 bool has_method_parameters() const 519 { return constMethod()->has_method_parameters(); } 520 int method_parameters_length() const 521 { return constMethod()->method_parameters_length(); } 522 MethodParametersElement* method_parameters_start() const 523 { return constMethod()->method_parameters_start(); } 524 525 // checked exceptions 526 int checked_exceptions_length() const 527 { return constMethod()->checked_exceptions_length(); } 528 CheckedExceptionElement* checked_exceptions_start() const 529 { return constMethod()->checked_exceptions_start(); } 530 531 // localvariable table 532 bool has_localvariable_table() const 533 { return constMethod()->has_localvariable_table(); } 534 int localvariable_table_length() const 535 { return constMethod()->localvariable_table_length(); } 536 LocalVariableTableElement* localvariable_table_start() const 537 { return constMethod()->localvariable_table_start(); } 538 539 bool has_linenumber_table() const 540 { return constMethod()->has_linenumber_table(); } 541 u_char* compressed_linenumber_table() const 542 { return constMethod()->compressed_linenumber_table(); } 543 544 // method holder (the Klass* holding this method) 545 InstanceKlass* method_holder() const { return constants()->pool_holder(); } 546 547 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 548 Symbol* klass_name() const; // returns the name of the method holder 549 BasicType result_type() const; // type of the method result 550 int result_type_index() const; // type index of the method result 551 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 552 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 553 554 // Checked exceptions thrown by this method (resolved to mirrors) 555 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 556 557 // Access flags 558 bool is_public() const { return access_flags().is_public(); } 559 bool is_private() const { return access_flags().is_private(); } 560 bool is_protected() const { return access_flags().is_protected(); } 561 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 562 bool is_static() const { return access_flags().is_static(); } 563 bool is_final() const { return access_flags().is_final(); } 564 bool is_synchronized() const { return access_flags().is_synchronized();} 565 bool is_native() const { return access_flags().is_native(); } 566 bool is_abstract() const { return access_flags().is_abstract(); } 567 bool is_strict() const { return access_flags().is_strict(); } 568 bool is_synthetic() const { return access_flags().is_synthetic(); } 569 570 // returns true if contains only return operation 571 bool is_empty_method() const; 572 573 // returns true if this is a vanilla constructor 574 bool is_vanilla_constructor() const; 575 576 // checks method and its method holder 577 bool is_final_method() const; 578 bool is_final_method(AccessFlags class_access_flags) const; 579 bool is_default_method() const; 580 581 // true if method needs no dynamic dispatch (final and/or no vtable entry) 582 bool can_be_statically_bound() const; 583 bool can_be_statically_bound(AccessFlags class_access_flags) const; 584 585 // returns true if the method has any backward branches. 586 bool has_loops() { 587 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 588 }; 589 590 bool compute_has_loops_flag(); 591 592 bool has_jsrs() { 593 return access_flags().has_jsrs(); 594 }; 595 void set_has_jsrs() { 596 _access_flags.set_has_jsrs(); 597 } 598 599 // returns true if the method has any monitors. 600 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 601 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 602 603 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 604 605 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 606 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 607 // has not been computed yet. 608 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 609 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 610 611 // returns true if the method is an accessor function (setter/getter). 612 bool is_accessor() const; 613 614 // returns true if the method is a getter 615 bool is_getter() const; 616 617 // returns true if the method is a setter 618 bool is_setter() const; 619 620 // returns true if the method does nothing but return a constant of primitive type 621 bool is_constant_getter() const; 622 623 // returns true if the method is an initializer (<init> or <clinit>). 624 bool is_initializer() const; 625 626 // returns true if the method is static OR if the classfile version < 51 627 bool has_valid_initializer_flags() const; 628 629 // returns true if the method name is <clinit> and the method has 630 // valid static initializer flags. 631 bool is_static_initializer() const; 632 633 // compiled code support 634 // NOTE: code() is inherently racy as deopt can be clearing code 635 // simultaneously. Use with caution. 636 bool has_compiled_code() const { return code() != NULL; } 637 638 // sizing 639 static int header_size() { return sizeof(Method)/wordSize; } 640 static int size(bool is_native); 641 int size() const { return method_size(); } 642 #if INCLUDE_SERVICES 643 void collect_statistics(KlassSizeStats *sz) const; 644 #endif 645 void log_touched(TRAPS); 646 static void print_touched_methods(outputStream* out); 647 648 // interpreter support 649 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } 650 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } 651 #ifdef CC_INTERP 652 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); } 653 #endif /* CC_INTERP */ 654 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); } 655 static ByteSize code_offset() { return byte_offset_of(Method, _code); } 656 static ByteSize method_data_offset() { 657 return byte_offset_of(Method, _method_data); 658 } 659 static ByteSize method_counters_offset() { 660 return byte_offset_of(Method, _method_counters); 661 } 662 #ifndef PRODUCT 663 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); } 664 #endif // not PRODUCT 665 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); } 666 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); } 667 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); } 668 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); } 669 670 // for code generation 671 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } 672 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } 673 static int intrinsic_id_size_in_bytes() { return sizeof(u2); } 674 675 // Static methods that are used to implement member methods where an exposed this pointer 676 // is needed due to possible GCs 677 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS); 678 679 // Returns the byte code index from the byte code pointer 680 int bci_from(address bcp) const; 681 address bcp_from(int bci) const; 682 address bcp_from(address bcp) const; 683 int validate_bci_from_bcp(address bcp) const; 684 int validate_bci(int bci) const; 685 686 // Returns the line number for a bci if debugging information for the method is prowided, 687 // -1 is returned otherwise. 688 int line_number_from_bci(int bci) const; 689 690 // Reflection support 691 bool is_overridden_in(Klass* k) const; 692 693 // Stack walking support 694 bool is_ignored_by_security_stack_walk() const; 695 696 // JSR 292 support 697 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) 698 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm 699 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. 700 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual 701 Symbol* signature, //anything at all 702 TRAPS); 703 static Klass* check_non_bcp_klass(Klass* klass); 704 705 enum { 706 // How many extra stack entries for invokedynamic 707 extra_stack_entries_for_jsr292 = 1 708 }; 709 710 // this operates only on invoke methods: 711 // presize interpreter frames for extra interpreter stack entries, if needed 712 // Account for the extra appendix argument for invokehandle/invokedynamic 713 static int extra_stack_entries() { return extra_stack_entries_for_jsr292; } 714 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize 715 716 // RedefineClasses() support: 717 bool is_old() const { return access_flags().is_old(); } 718 void set_is_old() { _access_flags.set_is_old(); } 719 bool is_obsolete() const { return access_flags().is_obsolete(); } 720 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 721 bool is_deleted() const { return access_flags().is_deleted(); } 722 void set_is_deleted() { _access_flags.set_is_deleted(); } 723 724 bool is_running_emcp() const { 725 // EMCP methods are old but not obsolete or deleted. Equivalent 726 // Modulo Constant Pool means the method is equivalent except 727 // the constant pool and instructions that access the constant 728 // pool might be different. 729 // If a breakpoint is set in a redefined method, its EMCP methods that are 730 // still running must have a breakpoint also. 731 return (_flags & _running_emcp) != 0; 732 } 733 734 void set_running_emcp(bool x) { 735 _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp); 736 } 737 738 bool on_stack() const { return access_flags().on_stack(); } 739 void set_on_stack(const bool value); 740 741 // see the definition in Method*.cpp for the gory details 742 bool should_not_be_cached() const; 743 744 // JVMTI Native method prefixing support: 745 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 746 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 747 748 // Rewriting support 749 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 750 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 751 752 // jmethodID handling 753 // Because the useful life-span of a jmethodID cannot be determined, 754 // once created they are never reclaimed. The methods to which they refer, 755 // however, can be GC'ed away if the class is unloaded or if the method is 756 // made obsolete or deleted -- in these cases, the jmethodID 757 // refers to NULL (as is the case for any weak reference). 758 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh); 759 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid); 760 761 // Ensure there is enough capacity in the internal tracking data 762 // structures to hold the number of jmethodIDs you plan to generate. 763 // This saves substantial time doing allocations. 764 static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity); 765 766 // Use resolve_jmethod_id() in situations where the caller is expected 767 // to provide a valid jmethodID; the only sanity checks are in asserts; 768 // result guaranteed not to be NULL. 769 inline static Method* resolve_jmethod_id(jmethodID mid) { 770 assert(mid != NULL, "JNI method id should not be null"); 771 return *((Method**)mid); 772 } 773 774 // Use checked_resolve_jmethod_id() in situations where the caller 775 // should provide a valid jmethodID, but might not. NULL is returned 776 // when the jmethodID does not refer to a valid method. 777 static Method* checked_resolve_jmethod_id(jmethodID mid); 778 779 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method); 780 static bool is_method_id(jmethodID mid); 781 782 // Clear methods 783 static void clear_jmethod_ids(ClassLoaderData* loader_data); 784 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN; 785 786 // Get this method's jmethodID -- allocate if it doesn't exist 787 jmethodID jmethod_id() { methodHandle this_h(this); 788 return InstanceKlass::get_jmethod_id(method_holder(), this_h); } 789 790 // Lookup the jmethodID for this method. Return NULL if not found. 791 // NOTE that this function can be called from a signal handler 792 // (see AsyncGetCallTrace support for Forte Analyzer) and this 793 // needs to be async-safe. No allocation should be done and 794 // so handles are not used to avoid deadlock. 795 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); } 796 797 // Support for inlining of intrinsic methods 798 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 799 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u2) id; } 800 801 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 802 void init_intrinsic_id(); // updates from _none if a match 803 static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder); 804 805 bool jfr_towrite() const { 806 return (_flags & _jfr_towrite) != 0; 807 } 808 void set_jfr_towrite(bool x) const { 809 _flags = x ? (_flags | _jfr_towrite) : (_flags & ~_jfr_towrite); 810 } 811 812 bool caller_sensitive() { 813 return (_flags & _caller_sensitive) != 0; 814 } 815 void set_caller_sensitive(bool x) { 816 _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive); 817 } 818 819 bool force_inline() { 820 return (_flags & _force_inline) != 0; 821 } 822 void set_force_inline(bool x) { 823 _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline); 824 } 825 826 bool dont_inline() { 827 return (_flags & _dont_inline) != 0; 828 } 829 void set_dont_inline(bool x) { 830 _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline); 831 } 832 833 bool is_hidden() { 834 return (_flags & _hidden) != 0; 835 } 836 void set_hidden(bool x) { 837 _flags = x ? (_flags | _hidden) : (_flags & ~_hidden); 838 } 839 840 bool intrinsic_candidate() { 841 return (_flags & _intrinsic_candidate) != 0; 842 } 843 void set_intrinsic_candidate(bool x) { 844 _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate); 845 } 846 847 bool has_injected_profile() { 848 return (_flags & _has_injected_profile) != 0; 849 } 850 void set_has_injected_profile(bool x) { 851 _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile); 852 } 853 854 bool has_reserved_stack_access() { 855 return (_flags & _reserved_stack_access) != 0; 856 } 857 858 void set_has_reserved_stack_access(bool x) { 859 _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access); 860 } 861 862 ConstMethod::MethodType method_type() const { 863 return _constMethod->method_type(); 864 } 865 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; } 866 867 // On-stack replacement support 868 bool has_osr_nmethod(int level, bool match_level) { 869 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 870 } 871 872 int mark_osr_nmethods() { 873 return method_holder()->mark_osr_nmethods(this); 874 } 875 876 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 877 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level); 878 } 879 880 // Inline cache support 881 void cleanup_inline_caches(); 882 883 // Find if klass for method is loaded 884 bool is_klass_loaded_by_klass_index(int klass_index) const; 885 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 886 887 // Indicates whether compilation failed earlier for this method, or 888 // whether it is not compilable for another reason like having a 889 // breakpoint set in it. 890 bool is_not_compilable(int comp_level = CompLevel_any) const; 891 void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); 892 void set_not_compilable_quietly(int comp_level = CompLevel_all) { 893 set_not_compilable(comp_level, false); 894 } 895 bool is_not_osr_compilable(int comp_level = CompLevel_any) const; 896 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); 897 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) { 898 set_not_osr_compilable(comp_level, false); 899 } 900 bool is_always_compilable() const; 901 902 private: 903 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason); 904 905 public: 906 MethodCounters* get_method_counters(TRAPS) { 907 if (_method_counters == NULL) { 908 build_method_counters(this, CHECK_AND_CLEAR_NULL); 909 } 910 return _method_counters; 911 } 912 913 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 914 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 915 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); } 916 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 917 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 918 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); } 919 920 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit 921 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit 922 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit 923 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); } 924 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); } 925 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); } 926 927 // Background compilation support 928 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 929 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 930 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 931 932 // Resolve all classes in signature, return 'true' if successful 933 static bool load_signature_classes(methodHandle m, TRAPS); 934 935 // Return if true if not all classes references in signature, including return type, has been loaded 936 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 937 938 // Printing 939 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM 940 #if INCLUDE_JVMTI 941 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses 942 #else 943 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" 944 #endif 945 946 // Helper routine used for method sorting 947 static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true); 948 949 // Deallocation function for redefine classes or if an error occurs 950 void deallocate_contents(ClassLoaderData* loader_data); 951 952 // Printing 953 #ifndef PRODUCT 954 void print_on(outputStream* st) const; 955 #endif 956 void print_value_on(outputStream* st) const; 957 void print_linkage_flags(outputStream* st) PRODUCT_RETURN; 958 959 const char* internal_name() const { return "{method}"; } 960 961 // Check for valid method pointer 962 static bool has_method_vptr(const void* ptr); 963 bool is_valid_method() const; 964 965 // Verify 966 void verify() { verify_on(tty); } 967 void verify_on(outputStream* st); 968 969 private: 970 971 // Inlined elements 972 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 973 address* signature_handler_addr() const { return native_function_addr() + 1; } 974 }; 975 976 977 // Utility class for compressing line number tables 978 979 class CompressedLineNumberWriteStream: public CompressedWriteStream { 980 private: 981 int _bci; 982 int _line; 983 public: 984 // Constructor 985 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 986 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 987 988 // Write (bci, line number) pair to stream 989 void write_pair_regular(int bci_delta, int line_delta); 990 991 inline void write_pair_inline(int bci, int line) { 992 int bci_delta = bci - _bci; 993 int line_delta = line - _line; 994 _bci = bci; 995 _line = line; 996 // Skip (0,0) deltas - they do not add information and conflict with terminator. 997 if (bci_delta == 0 && line_delta == 0) return; 998 // Check if bci is 5-bit and line number 3-bit unsigned. 999 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 1000 // Compress into single byte. 1001 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 1002 // Check that value doesn't match escape character. 1003 if (value != 0xFF) { 1004 write_byte(value); 1005 return; 1006 } 1007 } 1008 write_pair_regular(bci_delta, line_delta); 1009 } 1010 1011 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 1012 // Disabling optimization doesn't work for methods in header files 1013 // so we force it to call through the non-optimized version in the .cpp. 1014 // It's gross, but it's the only way we can ensure that all callers are 1015 // fixed. _MSC_VER is defined by the windows compiler 1016 #if defined(_M_AMD64) && _MSC_VER >= 1400 1017 void write_pair(int bci, int line); 1018 #else 1019 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 1020 #endif 1021 1022 // Write end-of-stream marker 1023 void write_terminator() { write_byte(0); } 1024 }; 1025 1026 1027 // Utility class for decompressing line number tables 1028 1029 class CompressedLineNumberReadStream: public CompressedReadStream { 1030 private: 1031 int _bci; 1032 int _line; 1033 public: 1034 // Constructor 1035 CompressedLineNumberReadStream(u_char* buffer); 1036 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 1037 bool read_pair(); 1038 // Accessing bci and line number (after calling read_pair) 1039 int bci() const { return _bci; } 1040 int line() const { return _line; } 1041 }; 1042 1043 1044 /// Fast Breakpoints. 1045 1046 // If this structure gets more complicated (because bpts get numerous), 1047 // move it into its own header. 1048 1049 // There is presently no provision for concurrent access 1050 // to breakpoint lists, which is only OK for JVMTI because 1051 // breakpoints are written only at safepoints, and are read 1052 // concurrently only outside of safepoints. 1053 1054 class BreakpointInfo : public CHeapObj<mtClass> { 1055 friend class VMStructs; 1056 private: 1057 Bytecodes::Code _orig_bytecode; 1058 int _bci; 1059 u2 _name_index; // of method 1060 u2 _signature_index; // of method 1061 BreakpointInfo* _next; // simple storage allocation 1062 1063 public: 1064 BreakpointInfo(Method* m, int bci); 1065 1066 // accessors 1067 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 1068 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 1069 int bci() { return _bci; } 1070 1071 BreakpointInfo* next() const { return _next; } 1072 void set_next(BreakpointInfo* n) { _next = n; } 1073 1074 // helps for searchers 1075 bool match(const Method* m, int bci) { 1076 return bci == _bci && match(m); 1077 } 1078 1079 bool match(const Method* m) { 1080 return _name_index == m->name_index() && 1081 _signature_index == m->signature_index(); 1082 } 1083 1084 void set(Method* method); 1085 void clear(Method* method); 1086 }; 1087 1088 // Utility class for access exception handlers 1089 class ExceptionTable : public StackObj { 1090 private: 1091 ExceptionTableElement* _table; 1092 u2 _length; 1093 1094 public: 1095 ExceptionTable(const Method* m) { 1096 if (m->has_exception_handler()) { 1097 _table = m->exception_table_start(); 1098 _length = m->exception_table_length(); 1099 } else { 1100 _table = NULL; 1101 _length = 0; 1102 } 1103 } 1104 1105 int length() const { 1106 return _length; 1107 } 1108 1109 u2 start_pc(int idx) const { 1110 assert(idx < _length, "out of bounds"); 1111 return _table[idx].start_pc; 1112 } 1113 1114 void set_start_pc(int idx, u2 value) { 1115 assert(idx < _length, "out of bounds"); 1116 _table[idx].start_pc = value; 1117 } 1118 1119 u2 end_pc(int idx) const { 1120 assert(idx < _length, "out of bounds"); 1121 return _table[idx].end_pc; 1122 } 1123 1124 void set_end_pc(int idx, u2 value) { 1125 assert(idx < _length, "out of bounds"); 1126 _table[idx].end_pc = value; 1127 } 1128 1129 u2 handler_pc(int idx) const { 1130 assert(idx < _length, "out of bounds"); 1131 return _table[idx].handler_pc; 1132 } 1133 1134 void set_handler_pc(int idx, u2 value) { 1135 assert(idx < _length, "out of bounds"); 1136 _table[idx].handler_pc = value; 1137 } 1138 1139 u2 catch_type_index(int idx) const { 1140 assert(idx < _length, "out of bounds"); 1141 return _table[idx].catch_type_index; 1142 } 1143 1144 void set_catch_type_index(int idx, u2 value) { 1145 assert(idx < _length, "out of bounds"); 1146 _table[idx].catch_type_index = value; 1147 } 1148 }; 1149 1150 #endif // SHARE_VM_OOPS_METHODOOP_HPP