1 /* 2 * Copyright (c) 1997, 2019, 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_OOPS_METHOD_HPP 26 #define SHARE_OOPS_METHOD_HPP 27 28 #include "classfile/vmSymbols.hpp" 29 #include "code/compressedStream.hpp" 30 #include "compiler/compilerDefinitions.hpp" 31 #include "compiler/oopMap.hpp" 32 #include "interpreter/invocationCounter.hpp" 33 #include "oops/annotations.hpp" 34 #include "oops/constantPool.hpp" 35 #include "oops/methodCounters.hpp" 36 #include "oops/instanceKlass.hpp" 37 #include "oops/oop.hpp" 38 #include "oops/typeArrayOop.hpp" 39 #include "utilities/accessFlags.hpp" 40 #include "utilities/align.hpp" 41 #include "utilities/growableArray.hpp" 42 #include "utilities/macros.hpp" 43 #if INCLUDE_JFR 44 #include "jfr/support/jfrTraceIdExtension.hpp" 45 #endif 46 47 48 // A Method represents a Java method. 49 // 50 // Note that most applications load thousands of methods, so keeping the size of this 51 // class small has a big impact on footprint. 52 // 53 // Note that native_function and signature_handler have to be at fixed offsets 54 // (required by the interpreter) 55 // 56 // Method embedded field layout (after declared fields): 57 // [EMBEDDED native_function (present only if native) ] 58 // [EMBEDDED signature_handler (present only if native) ] 59 60 class CheckedExceptionElement; 61 class LocalVariableTableElement; 62 class AdapterHandlerEntry; 63 class MethodData; 64 class MethodCounters; 65 class ConstMethod; 66 class InlineTableSizes; 67 class KlassSizeStats; 68 class CompiledMethod; 69 class InterpreterOopMap; 70 71 class Method : public Metadata { 72 friend class VMStructs; 73 friend class JVMCIVMStructs; 74 private: 75 // If you add a new field that points to any metaspace object, you 76 // must add this field to Method::metaspace_pointers_do(). 77 ConstMethod* _constMethod; // Method read-only data. 78 MethodData* _method_data; 79 MethodCounters* _method_counters; 80 AccessFlags _access_flags; // Access flags 81 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 82 // note: can have vtables with >2**16 elements (because of inheritance) 83 u2 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 84 85 // Flags 86 enum Flags { 87 _caller_sensitive = 1 << 0, 88 _force_inline = 1 << 1, 89 _dont_inline = 1 << 2, 90 _hidden = 1 << 3, 91 _has_injected_profile = 1 << 4, 92 _running_emcp = 1 << 5, 93 _intrinsic_candidate = 1 << 6, 94 _reserved_stack_access = 1 << 7 95 }; 96 mutable u2 _flags; 97 98 JFR_ONLY(DEFINE_TRACE_FLAG;) 99 100 #ifndef PRODUCT 101 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 102 #endif 103 // Entry point for calling both from and to the interpreter. 104 address _i2i_entry; // All-args-on-stack calling convention 105 // Entry point for calling from compiled code, to compiled code if it exists 106 // or else the interpreter. 107 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 108 // The entry point for calling both from and to compiled code is 109 // "_code->entry_point()". Because of tiered compilation and de-opt, this 110 // field can come and go. It can transition from NULL to not-null at any 111 // time (whenever a compile completes). It can transition from not-null to 112 // NULL only at safepoints (because of a de-opt). 113 CompiledMethod* volatile _code; // Points to the corresponding piece of native code 114 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 115 116 #if INCLUDE_AOT && defined(TIERED) 117 CompiledMethod* _aot_code; 118 #endif 119 120 // Constructor 121 Method(ConstMethod* xconst, AccessFlags access_flags); 122 public: 123 124 static Method* allocate(ClassLoaderData* loader_data, 125 int byte_code_size, 126 AccessFlags access_flags, 127 InlineTableSizes* sizes, 128 ConstMethod::MethodType method_type, 129 TRAPS); 130 131 // CDS and vtbl checking can create an empty Method to get vtbl pointer. 132 Method(){} 133 134 bool is_method() const volatile { return true; } 135 136 void restore_unshareable_info(TRAPS); 137 138 // accessors for instance variables 139 140 ConstMethod* constMethod() const { return _constMethod; } 141 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; } 142 143 144 static address make_adapters(const methodHandle& mh, TRAPS); 145 address from_compiled_entry() const; 146 address from_compiled_entry_no_trampoline() const; 147 address from_interpreted_entry() const; 148 149 // access flag 150 AccessFlags access_flags() const { return _access_flags; } 151 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 152 153 // name 154 Symbol* name() const { return constants()->symbol_at(name_index()); } 155 int name_index() const { return constMethod()->name_index(); } 156 void set_name_index(int index) { constMethod()->set_name_index(index); } 157 158 // signature 159 Symbol* signature() const { return constants()->symbol_at(signature_index()); } 160 int signature_index() const { return constMethod()->signature_index(); } 161 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 162 163 // generics support 164 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); } 165 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 166 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 167 168 // annotations support 169 AnnotationArray* annotations() const { 170 return constMethod()->method_annotations(); 171 } 172 AnnotationArray* parameter_annotations() const { 173 return constMethod()->parameter_annotations(); 174 } 175 AnnotationArray* annotation_default() const { 176 return constMethod()->default_annotations(); 177 } 178 AnnotationArray* type_annotations() const { 179 return constMethod()->type_annotations(); 180 } 181 182 // Helper routine: get klass name + "." + method name + signature as 183 // C string, for the purpose of providing more useful 184 // fatal error handling. The string is allocated in resource 185 // area if a buffer is not provided by the caller. 186 char* name_and_sig_as_C_string() const; 187 char* name_and_sig_as_C_string(char* buf, int size) const; 188 189 // Static routine in the situations we don't have a Method* 190 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); 191 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); 192 193 // Get return type + klass name + "." + method name + ( parameters types ) 194 // as a C string or print it to an outputStream. 195 // This is to be used to assemble strings passed to Java, so that 196 // the text more resembles Java code. Used in exception messages. 197 // Memory is allocated in the resource area; the caller needs 198 // a ResourceMark. 199 const char* external_name() const; 200 void print_external_name(outputStream *os) const; 201 202 static const char* external_name( Klass* klass, Symbol* method_name, Symbol* signature); 203 static void print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature); 204 205 Bytecodes::Code java_code_at(int bci) const { 206 return Bytecodes::java_code_at(this, bcp_from(bci)); 207 } 208 Bytecodes::Code code_at(int bci) const { 209 return Bytecodes::code_at(this, bcp_from(bci)); 210 } 211 212 // JVMTI breakpoints 213 #if !INCLUDE_JVMTI 214 Bytecodes::Code orig_bytecode_at(int bci) const { 215 ShouldNotReachHere(); 216 return Bytecodes::_shouldnotreachhere; 217 } 218 void set_orig_bytecode_at(int bci, Bytecodes::Code code) { 219 ShouldNotReachHere(); 220 }; 221 u2 number_of_breakpoints() const {return 0;} 222 #else // !INCLUDE_JVMTI 223 Bytecodes::Code orig_bytecode_at(int bci) const; 224 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 225 void set_breakpoint(int bci); 226 void clear_breakpoint(int bci); 227 void clear_all_breakpoints(); 228 // Tracking number of breakpoints, for fullspeed debugging. 229 // Only mutated by VM thread. 230 u2 number_of_breakpoints() const { 231 MethodCounters* mcs = method_counters(); 232 if (mcs == NULL) { 233 return 0; 234 } else { 235 return mcs->number_of_breakpoints(); 236 } 237 } 238 void incr_number_of_breakpoints(TRAPS) { 239 MethodCounters* mcs = get_method_counters(CHECK); 240 if (mcs != NULL) { 241 mcs->incr_number_of_breakpoints(); 242 } 243 } 244 void decr_number_of_breakpoints(TRAPS) { 245 MethodCounters* mcs = get_method_counters(CHECK); 246 if (mcs != NULL) { 247 mcs->decr_number_of_breakpoints(); 248 } 249 } 250 // Initialization only 251 void clear_number_of_breakpoints() { 252 MethodCounters* mcs = method_counters(); 253 if (mcs != NULL) { 254 mcs->clear_number_of_breakpoints(); 255 } 256 } 257 #endif // !INCLUDE_JVMTI 258 259 // index into InstanceKlass methods() array 260 // note: also used by jfr 261 u2 method_idnum() const { return constMethod()->method_idnum(); } 262 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 263 264 u2 orig_method_idnum() const { return constMethod()->orig_method_idnum(); } 265 void set_orig_method_idnum(u2 idnum) { constMethod()->set_orig_method_idnum(idnum); } 266 267 // code size 268 int code_size() const { return constMethod()->code_size(); } 269 270 // method size in words 271 int method_size() const { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); } 272 273 // constant pool for Klass* holding this method 274 ConstantPool* constants() const { return constMethod()->constants(); } 275 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); } 276 277 // max stack 278 // return original max stack size for method verification 279 int verifier_max_stack() const { return constMethod()->max_stack(); } 280 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); } 281 void set_max_stack(int size) { constMethod()->set_max_stack(size); } 282 283 // max locals 284 int max_locals() const { return constMethod()->max_locals(); } 285 void set_max_locals(int size) { constMethod()->set_max_locals(size); } 286 287 int highest_comp_level() const; 288 void set_highest_comp_level(int level); 289 int highest_osr_comp_level() const; 290 void set_highest_osr_comp_level(int level); 291 292 #if COMPILER2_OR_JVMCI 293 // Count of times method was exited via exception while interpreting 294 void interpreter_throwout_increment(TRAPS) { 295 MethodCounters* mcs = get_method_counters(CHECK); 296 if (mcs != NULL) { 297 mcs->interpreter_throwout_increment(); 298 } 299 } 300 #endif 301 302 int interpreter_throwout_count() const { 303 MethodCounters* mcs = method_counters(); 304 if (mcs == NULL) { 305 return 0; 306 } else { 307 return mcs->interpreter_throwout_count(); 308 } 309 } 310 311 // size of parameters 312 int size_of_parameters() const { return constMethod()->size_of_parameters(); } 313 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); } 314 315 bool has_stackmap_table() const { 316 return constMethod()->has_stackmap_table(); 317 } 318 319 Array<u1>* stackmap_data() const { 320 return constMethod()->stackmap_data(); 321 } 322 323 void set_stackmap_data(Array<u1>* sd) { 324 constMethod()->set_stackmap_data(sd); 325 } 326 327 // exception handler table 328 bool has_exception_handler() const 329 { return constMethod()->has_exception_handler(); } 330 int exception_table_length() const 331 { return constMethod()->exception_table_length(); } 332 ExceptionTableElement* exception_table_start() const 333 { return constMethod()->exception_table_start(); } 334 335 // Finds the first entry point bci of an exception handler for an 336 // exception of klass ex_klass thrown at throw_bci. A value of NULL 337 // for ex_klass indicates that the exception klass is not known; in 338 // this case it matches any constraint class. Returns -1 if the 339 // exception cannot be handled in this method. The handler 340 // constraint classes are loaded if necessary. Note that this may 341 // throw an exception if loading of the constraint classes causes 342 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 343 // If an exception is thrown, returns the bci of the 344 // exception handler which caused the exception to be thrown, which 345 // is needed for proper retries. See, for example, 346 // InterpreterRuntime::exception_handler_for_exception. 347 static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS); 348 349 // method data access 350 MethodData* method_data() const { 351 return _method_data; 352 } 353 354 void set_method_data(MethodData* data); 355 356 MethodCounters* method_counters() const { 357 return _method_counters; 358 } 359 360 void clear_method_counters() { 361 _method_counters = NULL; 362 } 363 364 bool init_method_counters(MethodCounters* counters); 365 366 #ifdef TIERED 367 // We are reusing interpreter_invocation_count as a holder for the previous event count! 368 // We can do that since interpreter_invocation_count is not used in tiered. 369 int prev_event_count() const { 370 if (method_counters() == NULL) { 371 return 0; 372 } else { 373 return method_counters()->interpreter_invocation_count(); 374 } 375 } 376 void set_prev_event_count(int count) { 377 MethodCounters* mcs = method_counters(); 378 if (mcs != NULL) { 379 mcs->set_interpreter_invocation_count(count); 380 } 381 } 382 jlong prev_time() const { 383 MethodCounters* mcs = method_counters(); 384 return mcs == NULL ? 0 : mcs->prev_time(); 385 } 386 void set_prev_time(jlong time) { 387 MethodCounters* mcs = method_counters(); 388 if (mcs != NULL) { 389 mcs->set_prev_time(time); 390 } 391 } 392 float rate() const { 393 MethodCounters* mcs = method_counters(); 394 return mcs == NULL ? 0 : mcs->rate(); 395 } 396 void set_rate(float rate) { 397 MethodCounters* mcs = method_counters(); 398 if (mcs != NULL) { 399 mcs->set_rate(rate); 400 } 401 } 402 403 #if INCLUDE_AOT 404 void set_aot_code(CompiledMethod* aot_code) { 405 _aot_code = aot_code; 406 } 407 408 CompiledMethod* aot_code() const { 409 return _aot_code; 410 } 411 #else 412 CompiledMethod* aot_code() const { return NULL; } 413 #endif // INCLUDE_AOT 414 #endif // TIERED 415 416 int nmethod_age() const { 417 if (method_counters() == NULL) { 418 return INT_MAX; 419 } else { 420 return method_counters()->nmethod_age(); 421 } 422 } 423 424 int invocation_count(); 425 int backedge_count(); 426 427 bool was_executed_more_than(int n); 428 bool was_never_executed() { return !was_executed_more_than(0); } 429 430 static void build_interpreter_method_data(const methodHandle& method, TRAPS); 431 432 static MethodCounters* build_method_counters(Method* m, TRAPS); 433 434 int interpreter_invocation_count() { 435 if (TieredCompilation) { 436 return invocation_count(); 437 } else { 438 MethodCounters* mcs = method_counters(); 439 return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count(); 440 } 441 } 442 #if COMPILER2_OR_JVMCI 443 int increment_interpreter_invocation_count(TRAPS) { 444 if (TieredCompilation) ShouldNotReachHere(); 445 MethodCounters* mcs = get_method_counters(CHECK_0); 446 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count(); 447 } 448 #endif 449 450 #ifndef PRODUCT 451 int compiled_invocation_count() const { return _compiled_invocation_count; } 452 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 453 #else 454 // for PrintMethodData in a product build 455 int compiled_invocation_count() const { return 0; } 456 #endif // not PRODUCT 457 458 // Clear (non-shared space) pointers which could not be relevant 459 // if this (shared) method were mapped into another JVM. 460 void remove_unshareable_info(); 461 462 // nmethod/verified compiler entry 463 address verified_code_entry(); 464 bool check_code() const; // Not inline to avoid circular ref 465 CompiledMethod* volatile code() const; 466 void clear_code(bool acquire_lock = true); // Clear out any compiled code 467 static void set_code(const methodHandle& mh, CompiledMethod* code); 468 void set_adapter_entry(AdapterHandlerEntry* adapter) { 469 constMethod()->set_adapter_entry(adapter); 470 } 471 void set_adapter_trampoline(AdapterHandlerEntry** trampoline) { 472 constMethod()->set_adapter_trampoline(trampoline); 473 } 474 void update_adapter_trampoline(AdapterHandlerEntry* adapter) { 475 constMethod()->update_adapter_trampoline(adapter); 476 } 477 void set_from_compiled_entry(address entry) { 478 _from_compiled_entry = entry; 479 } 480 481 address get_i2c_entry(); 482 address get_c2i_entry(); 483 address get_c2i_unverified_entry(); 484 address get_c2i_no_clinit_check_entry(); 485 AdapterHandlerEntry* adapter() const { 486 return constMethod()->adapter(); 487 } 488 // setup entry points 489 void link_method(const methodHandle& method, TRAPS); 490 // clear entry points. Used by sharing code during dump time 491 void unlink_method() NOT_CDS_RETURN; 492 493 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 494 virtual MetaspaceObj::Type type() const { return MethodType; } 495 496 // vtable index 497 enum VtableIndexFlag { 498 // Valid vtable indexes are non-negative (>= 0). 499 // These few negative values are used as sentinels. 500 itable_index_max = -10, // first itable index, growing downward 501 pending_itable_index = -9, // itable index will be assigned 502 invalid_vtable_index = -4, // distinct from any valid vtable index 503 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 504 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 505 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 506 }; 507 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 508 bool has_vtable_index() const { return _vtable_index >= 0; } 509 int vtable_index() const { return _vtable_index; } 510 void set_vtable_index(int index); 511 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; }) 512 bool has_itable_index() const { return _vtable_index <= itable_index_max; } 513 int itable_index() const { assert(valid_itable_index(), ""); 514 return itable_index_max - _vtable_index; } 515 void set_itable_index(int index); 516 517 // interpreter entry 518 address interpreter_entry() const { return _i2i_entry; } 519 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 520 void set_interpreter_entry(address entry) { 521 assert(!is_shared(), 522 "shared method's interpreter entry should not be changed at run time"); 523 if (_i2i_entry != entry) { 524 _i2i_entry = entry; 525 } 526 if (_from_interpreted_entry != entry) { 527 _from_interpreted_entry = entry; 528 } 529 } 530 531 // native function (used for native methods only) 532 enum { 533 native_bind_event_is_interesting = true 534 }; 535 address native_function() const { return *(native_function_addr()); } 536 537 // Must specify a real function (not NULL). 538 // Use clear_native_function() to unregister. 539 void set_native_function(address function, bool post_event_flag); 540 bool has_native_function() const; 541 void clear_native_function(); 542 543 // signature handler (used for native methods only) 544 address signature_handler() const { return *(signature_handler_addr()); } 545 void set_signature_handler(address handler); 546 547 // Interpreter oopmap support 548 void mask_for(int bci, InterpreterOopMap* mask); 549 550 // operations on invocation counter 551 void print_invocation_count(); 552 553 // byte codes 554 void set_code(address code) { return constMethod()->set_code(code); } 555 address code_base() const { return constMethod()->code_base(); } 556 bool contains(address bcp) const { return constMethod()->contains(bcp); } 557 558 // prints byte codes 559 void print_codes() const { print_codes_on(tty); } 560 void print_codes_on(outputStream* st) const; 561 void print_codes_on(int from, int to, outputStream* st) const; 562 563 // method parameters 564 bool has_method_parameters() const 565 { return constMethod()->has_method_parameters(); } 566 int method_parameters_length() const 567 { return constMethod()->method_parameters_length(); } 568 MethodParametersElement* method_parameters_start() const 569 { return constMethod()->method_parameters_start(); } 570 571 // checked exceptions 572 int checked_exceptions_length() const 573 { return constMethod()->checked_exceptions_length(); } 574 CheckedExceptionElement* checked_exceptions_start() const 575 { return constMethod()->checked_exceptions_start(); } 576 577 // localvariable table 578 bool has_localvariable_table() const 579 { return constMethod()->has_localvariable_table(); } 580 int localvariable_table_length() const 581 { return constMethod()->localvariable_table_length(); } 582 LocalVariableTableElement* localvariable_table_start() const 583 { return constMethod()->localvariable_table_start(); } 584 585 bool has_linenumber_table() const 586 { return constMethod()->has_linenumber_table(); } 587 u_char* compressed_linenumber_table() const 588 { return constMethod()->compressed_linenumber_table(); } 589 590 // method holder (the Klass* holding this method) 591 InstanceKlass* method_holder() const { return constants()->pool_holder(); } 592 593 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 594 Symbol* klass_name() const; // returns the name of the method holder 595 BasicType result_type() const; // type of the method result 596 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 597 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 598 599 // Checked exceptions thrown by this method (resolved to mirrors) 600 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 601 602 // Access flags 603 bool is_public() const { return access_flags().is_public(); } 604 bool is_private() const { return access_flags().is_private(); } 605 bool is_protected() const { return access_flags().is_protected(); } 606 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 607 bool is_static() const { return access_flags().is_static(); } 608 bool is_final() const { return access_flags().is_final(); } 609 bool is_synchronized() const { return access_flags().is_synchronized();} 610 bool is_native() const { return access_flags().is_native(); } 611 bool is_abstract() const { return access_flags().is_abstract(); } 612 bool is_strict() const { return access_flags().is_strict(); } 613 bool is_synthetic() const { return access_flags().is_synthetic(); } 614 615 // returns true if contains only return operation 616 bool is_empty_method() const; 617 618 // returns true if this is a vanilla constructor 619 bool is_vanilla_constructor() const; 620 621 // checks method and its method holder 622 bool is_final_method() const; 623 bool is_final_method(AccessFlags class_access_flags) const; 624 // interface method declared with 'default' - excludes private interface methods 625 bool is_default_method() const; 626 627 // true if method needs no dynamic dispatch (final and/or no vtable entry) 628 bool can_be_statically_bound() const; 629 bool can_be_statically_bound(InstanceKlass* context) const; 630 bool can_be_statically_bound(AccessFlags class_access_flags) const; 631 632 // returns true if the method has any backward branches. 633 bool has_loops() { 634 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 635 }; 636 637 bool compute_has_loops_flag(); 638 639 bool has_jsrs() { 640 return access_flags().has_jsrs(); 641 }; 642 void set_has_jsrs() { 643 _access_flags.set_has_jsrs(); 644 } 645 646 // returns true if the method has any monitors. 647 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 648 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 649 650 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 651 652 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 653 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 654 // has not been computed yet. 655 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 656 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 657 658 // returns true if the method is an accessor function (setter/getter). 659 bool is_accessor() const; 660 661 // returns true if the method is a getter 662 bool is_getter() const; 663 664 // returns true if the method is a setter 665 bool is_setter() const; 666 667 // returns true if the method does nothing but return a constant of primitive type 668 bool is_constant_getter() const; 669 670 // returns true if the method is an initializer (<init> or <clinit>). 671 bool is_initializer() const; 672 673 // returns true if the method is static OR if the classfile version < 51 674 bool has_valid_initializer_flags() const; 675 676 // returns true if the method name is <clinit> and the method has 677 // valid static initializer flags. 678 bool is_static_initializer() const; 679 680 // returns true if the method name is <init> 681 bool is_object_initializer() const; 682 683 // compiled code support 684 // NOTE: code() is inherently racy as deopt can be clearing code 685 // simultaneously. Use with caution. 686 bool has_compiled_code() const; 687 688 #ifdef TIERED 689 bool has_aot_code() const { return aot_code() != NULL; } 690 #endif 691 692 bool needs_clinit_barrier() const; 693 694 // sizing 695 static int header_size() { 696 return align_up((int)sizeof(Method), wordSize) / wordSize; 697 } 698 static int size(bool is_native); 699 int size() const { return method_size(); } 700 #if INCLUDE_SERVICES 701 void collect_statistics(KlassSizeStats *sz) const; 702 #endif 703 void log_touched(TRAPS); 704 static void print_touched_methods(outputStream* out); 705 706 // interpreter support 707 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } 708 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } 709 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); } 710 static ByteSize code_offset() { return byte_offset_of(Method, _code); } 711 static ByteSize method_data_offset() { 712 return byte_offset_of(Method, _method_data); 713 } 714 static ByteSize method_counters_offset() { 715 return byte_offset_of(Method, _method_counters); 716 } 717 #ifndef PRODUCT 718 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); } 719 #endif // not PRODUCT 720 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); } 721 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); } 722 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); } 723 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); } 724 static ByteSize itable_index_offset() { return byte_offset_of(Method, _vtable_index ); } 725 726 // for code generation 727 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } 728 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } 729 static int intrinsic_id_size_in_bytes() { return sizeof(u2); } 730 731 // Static methods that are used to implement member methods where an exposed this pointer 732 // is needed due to possible GCs 733 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS); 734 735 // Returns the byte code index from the byte code pointer 736 int bci_from(address bcp) const; 737 address bcp_from(int bci) const; 738 address bcp_from(address bcp) const; 739 int validate_bci_from_bcp(address bcp) const; 740 int validate_bci(int bci) const; 741 742 // Returns the line number for a bci if debugging information for the method is prowided, 743 // -1 is returned otherwise. 744 int line_number_from_bci(int bci) const; 745 746 // Reflection support 747 bool is_overridden_in(Klass* k) const; 748 749 // Stack walking support 750 bool is_ignored_by_security_stack_walk() const; 751 752 // JSR 292 support 753 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) 754 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm 755 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. 756 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual 757 Symbol* signature, //anything at all 758 TRAPS); 759 static Klass* check_non_bcp_klass(Klass* klass); 760 761 enum { 762 // How many extra stack entries for invokedynamic 763 extra_stack_entries_for_jsr292 = 1 764 }; 765 766 // this operates only on invoke methods: 767 // presize interpreter frames for extra interpreter stack entries, if needed 768 // Account for the extra appendix argument for invokehandle/invokedynamic 769 static int extra_stack_entries() { return extra_stack_entries_for_jsr292; } 770 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize 771 772 // RedefineClasses() support: 773 bool is_old() const { return access_flags().is_old(); } 774 void set_is_old() { _access_flags.set_is_old(); } 775 bool is_obsolete() const { return access_flags().is_obsolete(); } 776 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 777 bool is_deleted() const { return access_flags().is_deleted(); } 778 void set_is_deleted() { _access_flags.set_is_deleted(); } 779 780 bool is_running_emcp() const { 781 // EMCP methods are old but not obsolete or deleted. Equivalent 782 // Modulo Constant Pool means the method is equivalent except 783 // the constant pool and instructions that access the constant 784 // pool might be different. 785 // If a breakpoint is set in a redefined method, its EMCP methods that are 786 // still running must have a breakpoint also. 787 return (_flags & _running_emcp) != 0; 788 } 789 790 void set_running_emcp(bool x) { 791 _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp); 792 } 793 794 bool on_stack() const { return access_flags().on_stack(); } 795 void set_on_stack(const bool value); 796 797 // see the definition in Method*.cpp for the gory details 798 bool should_not_be_cached() const; 799 800 // JVMTI Native method prefixing support: 801 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 802 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 803 804 // Rewriting support 805 static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 806 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 807 808 // jmethodID handling 809 // Because the useful life-span of a jmethodID cannot be determined, 810 // once created they are never reclaimed. The methods to which they refer, 811 // however, can be GC'ed away if the class is unloaded or if the method is 812 // made obsolete or deleted -- in these cases, the jmethodID 813 // refers to NULL (as is the case for any weak reference). 814 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh); 815 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid); 816 817 // Ensure there is enough capacity in the internal tracking data 818 // structures to hold the number of jmethodIDs you plan to generate. 819 // This saves substantial time doing allocations. 820 static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity); 821 822 // Use resolve_jmethod_id() in situations where the caller is expected 823 // to provide a valid jmethodID; the only sanity checks are in asserts; 824 // result guaranteed not to be NULL. 825 inline static Method* resolve_jmethod_id(jmethodID mid) { 826 assert(mid != NULL, "JNI method id should not be null"); 827 return *((Method**)mid); 828 } 829 830 // Use checked_resolve_jmethod_id() in situations where the caller 831 // should provide a valid jmethodID, but might not. NULL is returned 832 // when the jmethodID does not refer to a valid method. 833 static Method* checked_resolve_jmethod_id(jmethodID mid); 834 835 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method); 836 static bool is_method_id(jmethodID mid); 837 838 // Clear methods 839 static void clear_jmethod_ids(ClassLoaderData* loader_data); 840 static void print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN; 841 842 // Get this method's jmethodID -- allocate if it doesn't exist 843 jmethodID jmethod_id() { return method_holder()->get_jmethod_id(this); } 844 845 // Lookup the jmethodID for this method. Return NULL if not found. 846 // NOTE that this function can be called from a signal handler 847 // (see AsyncGetCallTrace support for Forte Analyzer) and this 848 // needs to be async-safe. No allocation should be done and 849 // so handles are not used to avoid deadlock. 850 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); } 851 852 // Support for inlining of intrinsic methods 853 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 854 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u2) id; } 855 856 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 857 void init_intrinsic_id(); // updates from _none if a match 858 static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder); 859 860 bool caller_sensitive() { 861 return (_flags & _caller_sensitive) != 0; 862 } 863 void set_caller_sensitive(bool x) { 864 _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive); 865 } 866 867 bool force_inline() { 868 return (_flags & _force_inline) != 0; 869 } 870 void set_force_inline(bool x) { 871 _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline); 872 } 873 874 bool dont_inline() { 875 return (_flags & _dont_inline) != 0; 876 } 877 void set_dont_inline(bool x) { 878 _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline); 879 } 880 881 bool is_hidden() { 882 return (_flags & _hidden) != 0; 883 } 884 void set_hidden(bool x) { 885 _flags = x ? (_flags | _hidden) : (_flags & ~_hidden); 886 } 887 888 bool intrinsic_candidate() { 889 return (_flags & _intrinsic_candidate) != 0; 890 } 891 void set_intrinsic_candidate(bool x) { 892 _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate); 893 } 894 895 bool has_injected_profile() { 896 return (_flags & _has_injected_profile) != 0; 897 } 898 void set_has_injected_profile(bool x) { 899 _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile); 900 } 901 902 bool has_reserved_stack_access() { 903 return (_flags & _reserved_stack_access) != 0; 904 } 905 906 void set_has_reserved_stack_access(bool x) { 907 _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access); 908 } 909 910 JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;) 911 912 ConstMethod::MethodType method_type() const { 913 return _constMethod->method_type(); 914 } 915 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; } 916 917 // On-stack replacement support 918 bool has_osr_nmethod(int level, bool match_level) { 919 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 920 } 921 922 int mark_osr_nmethods() { 923 return method_holder()->mark_osr_nmethods(this); 924 } 925 926 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 927 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level); 928 } 929 930 // Find if klass for method is loaded 931 bool is_klass_loaded_by_klass_index(int klass_index) const; 932 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 933 934 // Indicates whether compilation failed earlier for this method, or 935 // whether it is not compilable for another reason like having a 936 // breakpoint set in it. 937 bool is_not_compilable(int comp_level = CompLevel_any) const; 938 void set_not_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true); 939 void set_not_compilable_quietly(const char* reason, int comp_level = CompLevel_all) { 940 set_not_compilable(reason, comp_level, false); 941 } 942 bool is_not_osr_compilable(int comp_level = CompLevel_any) const; 943 void set_not_osr_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true); 944 void set_not_osr_compilable_quietly(const char* reason, int comp_level = CompLevel_all) { 945 set_not_osr_compilable(reason, comp_level, false); 946 } 947 bool is_always_compilable() const; 948 949 private: 950 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason); 951 952 public: 953 MethodCounters* get_method_counters(TRAPS) { 954 if (_method_counters == NULL) { 955 build_method_counters(this, CHECK_AND_CLEAR_NULL); 956 } 957 return _method_counters; 958 } 959 960 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 961 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 962 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); } 963 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 964 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 965 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); } 966 967 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit 968 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit 969 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit 970 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); } 971 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); } 972 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); } 973 974 // Background compilation support 975 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 976 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 977 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 978 979 // Resolve all classes in signature, return 'true' if successful 980 static bool load_signature_classes(const methodHandle& m, TRAPS); 981 982 // Return if true if not all classes references in signature, including return type, has been loaded 983 static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS); 984 985 // Printing 986 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM 987 #if INCLUDE_JVMTI 988 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses 989 #else 990 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" 991 #endif 992 993 // Helper routine used for method sorting 994 static void sort_methods(Array<Method*>* methods, bool set_idnums = true); 995 996 // Deallocation function for redefine classes or if an error occurs 997 void deallocate_contents(ClassLoaderData* loader_data); 998 999 Method* get_new_method() const { 1000 InstanceKlass* holder = method_holder(); 1001 Method* new_method = holder->method_with_idnum(orig_method_idnum()); 1002 1003 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1004 assert(this != new_method, "sanity check"); 1005 return new_method; 1006 } 1007 1008 // Printing 1009 #ifndef PRODUCT 1010 void print_on(outputStream* st) const; 1011 #endif 1012 void print_value_on(outputStream* st) const; 1013 void print_linkage_flags(outputStream* st) PRODUCT_RETURN; 1014 1015 const char* internal_name() const { return "{method}"; } 1016 1017 // Check for valid method pointer 1018 static bool has_method_vptr(const void* ptr); 1019 static bool is_valid_method(const Method* m); 1020 1021 // Verify 1022 void verify() { verify_on(tty); } 1023 void verify_on(outputStream* st); 1024 1025 private: 1026 1027 // Inlined elements 1028 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 1029 address* signature_handler_addr() const { return native_function_addr() + 1; } 1030 }; 1031 1032 1033 // Utility class for compressing line number tables 1034 1035 class CompressedLineNumberWriteStream: public CompressedWriteStream { 1036 private: 1037 int _bci; 1038 int _line; 1039 public: 1040 // Constructor 1041 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 1042 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 1043 1044 // Write (bci, line number) pair to stream 1045 void write_pair_regular(int bci_delta, int line_delta); 1046 1047 // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1048 // we save it as one byte, otherwise we write a 0xFF escape character 1049 // and use regular compression. 0x0 is used as end-of-stream terminator. 1050 void write_pair_inline(int bci, int line); 1051 1052 void write_pair(int bci, int line); 1053 1054 // Write end-of-stream marker 1055 void write_terminator() { write_byte(0); } 1056 }; 1057 1058 1059 // Utility class for decompressing line number tables 1060 1061 class CompressedLineNumberReadStream: public CompressedReadStream { 1062 private: 1063 int _bci; 1064 int _line; 1065 public: 1066 // Constructor 1067 CompressedLineNumberReadStream(u_char* buffer); 1068 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 1069 bool read_pair(); 1070 // Accessing bci and line number (after calling read_pair) 1071 int bci() const { return _bci; } 1072 int line() const { return _line; } 1073 }; 1074 1075 1076 #if INCLUDE_JVMTI 1077 1078 /// Fast Breakpoints. 1079 1080 // If this structure gets more complicated (because bpts get numerous), 1081 // move it into its own header. 1082 1083 // There is presently no provision for concurrent access 1084 // to breakpoint lists, which is only OK for JVMTI because 1085 // breakpoints are written only at safepoints, and are read 1086 // concurrently only outside of safepoints. 1087 1088 class BreakpointInfo : public CHeapObj<mtClass> { 1089 friend class VMStructs; 1090 private: 1091 Bytecodes::Code _orig_bytecode; 1092 int _bci; 1093 u2 _name_index; // of method 1094 u2 _signature_index; // of method 1095 BreakpointInfo* _next; // simple storage allocation 1096 1097 public: 1098 BreakpointInfo(Method* m, int bci); 1099 1100 // accessors 1101 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 1102 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 1103 int bci() { return _bci; } 1104 1105 BreakpointInfo* next() const { return _next; } 1106 void set_next(BreakpointInfo* n) { _next = n; } 1107 1108 // helps for searchers 1109 bool match(const Method* m, int bci) { 1110 return bci == _bci && match(m); 1111 } 1112 1113 bool match(const Method* m) { 1114 return _name_index == m->name_index() && 1115 _signature_index == m->signature_index(); 1116 } 1117 1118 void set(Method* method); 1119 void clear(Method* method); 1120 }; 1121 1122 #endif // INCLUDE_JVMTI 1123 1124 // Utility class for access exception handlers 1125 class ExceptionTable : public StackObj { 1126 private: 1127 ExceptionTableElement* _table; 1128 u2 _length; 1129 1130 public: 1131 ExceptionTable(const Method* m) { 1132 if (m->has_exception_handler()) { 1133 _table = m->exception_table_start(); 1134 _length = m->exception_table_length(); 1135 } else { 1136 _table = NULL; 1137 _length = 0; 1138 } 1139 } 1140 1141 int length() const { 1142 return _length; 1143 } 1144 1145 u2 start_pc(int idx) const { 1146 assert(idx < _length, "out of bounds"); 1147 return _table[idx].start_pc; 1148 } 1149 1150 void set_start_pc(int idx, u2 value) { 1151 assert(idx < _length, "out of bounds"); 1152 _table[idx].start_pc = value; 1153 } 1154 1155 u2 end_pc(int idx) const { 1156 assert(idx < _length, "out of bounds"); 1157 return _table[idx].end_pc; 1158 } 1159 1160 void set_end_pc(int idx, u2 value) { 1161 assert(idx < _length, "out of bounds"); 1162 _table[idx].end_pc = value; 1163 } 1164 1165 u2 handler_pc(int idx) const { 1166 assert(idx < _length, "out of bounds"); 1167 return _table[idx].handler_pc; 1168 } 1169 1170 void set_handler_pc(int idx, u2 value) { 1171 assert(idx < _length, "out of bounds"); 1172 _table[idx].handler_pc = value; 1173 } 1174 1175 u2 catch_type_index(int idx) const { 1176 assert(idx < _length, "out of bounds"); 1177 return _table[idx].catch_type_index; 1178 } 1179 1180 void set_catch_type_index(int idx, u2 value) { 1181 assert(idx < _length, "out of bounds"); 1182 _table[idx].catch_type_index = value; 1183 } 1184 }; 1185 1186 #endif // SHARE_OOPS_METHOD_HPP