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 static bool register_native(Klass* k, 350 Symbol* name, 351 Symbol* signature, 352 address entry, 353 TRAPS); 354 355 // method data access 356 MethodData* method_data() const { 357 return _method_data; 358 } 359 360 void set_method_data(MethodData* data); 361 362 MethodCounters* method_counters() const { 363 return _method_counters; 364 } 365 366 void clear_method_counters() { 367 _method_counters = NULL; 368 } 369 370 bool init_method_counters(MethodCounters* counters); 371 372 #ifdef TIERED 373 // We are reusing interpreter_invocation_count as a holder for the previous event count! 374 // We can do that since interpreter_invocation_count is not used in tiered. 375 int prev_event_count() const { 376 if (method_counters() == NULL) { 377 return 0; 378 } else { 379 return method_counters()->interpreter_invocation_count(); 380 } 381 } 382 void set_prev_event_count(int count) { 383 MethodCounters* mcs = method_counters(); 384 if (mcs != NULL) { 385 mcs->set_interpreter_invocation_count(count); 386 } 387 } 388 jlong prev_time() const { 389 MethodCounters* mcs = method_counters(); 390 return mcs == NULL ? 0 : mcs->prev_time(); 391 } 392 void set_prev_time(jlong time) { 393 MethodCounters* mcs = method_counters(); 394 if (mcs != NULL) { 395 mcs->set_prev_time(time); 396 } 397 } 398 float rate() const { 399 MethodCounters* mcs = method_counters(); 400 return mcs == NULL ? 0 : mcs->rate(); 401 } 402 void set_rate(float rate) { 403 MethodCounters* mcs = method_counters(); 404 if (mcs != NULL) { 405 mcs->set_rate(rate); 406 } 407 } 408 409 #if INCLUDE_AOT 410 void set_aot_code(CompiledMethod* aot_code) { 411 _aot_code = aot_code; 412 } 413 414 CompiledMethod* aot_code() const { 415 return _aot_code; 416 } 417 #else 418 CompiledMethod* aot_code() const { return NULL; } 419 #endif // INCLUDE_AOT 420 #endif // TIERED 421 422 int nmethod_age() const { 423 if (method_counters() == NULL) { 424 return INT_MAX; 425 } else { 426 return method_counters()->nmethod_age(); 427 } 428 } 429 430 int invocation_count(); 431 int backedge_count(); 432 433 bool was_executed_more_than(int n); 434 bool was_never_executed() { return !was_executed_more_than(0); } 435 436 static void build_interpreter_method_data(const methodHandle& method, TRAPS); 437 438 static MethodCounters* build_method_counters(Method* m, TRAPS); 439 440 int interpreter_invocation_count() { 441 if (TieredCompilation) { 442 return invocation_count(); 443 } else { 444 MethodCounters* mcs = method_counters(); 445 return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count(); 446 } 447 } 448 #if COMPILER2_OR_JVMCI 449 int increment_interpreter_invocation_count(TRAPS) { 450 if (TieredCompilation) ShouldNotReachHere(); 451 MethodCounters* mcs = get_method_counters(CHECK_0); 452 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count(); 453 } 454 #endif 455 456 #ifndef PRODUCT 457 int compiled_invocation_count() const { return _compiled_invocation_count; } 458 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 459 #else 460 // for PrintMethodData in a product build 461 int compiled_invocation_count() const { return 0; } 462 #endif // not PRODUCT 463 464 // Clear (non-shared space) pointers which could not be relevant 465 // if this (shared) method were mapped into another JVM. 466 void remove_unshareable_info(); 467 468 // nmethod/verified compiler entry 469 address verified_code_entry(); 470 bool check_code() const; // Not inline to avoid circular ref 471 CompiledMethod* volatile code() const; 472 473 // Locks CompiledMethod_lock if not held. 474 void unlink_code(CompiledMethod *compare); 475 // Locks CompiledMethod_lock if not held. 476 void unlink_code(); 477 478 private: 479 // Either called with CompiledMethod_lock held or from constructor. 480 void clear_code(); 481 482 public: 483 static void set_code(const methodHandle& mh, CompiledMethod* code); 484 void set_adapter_entry(AdapterHandlerEntry* adapter) { 485 constMethod()->set_adapter_entry(adapter); 486 } 487 void set_adapter_trampoline(AdapterHandlerEntry** trampoline) { 488 constMethod()->set_adapter_trampoline(trampoline); 489 } 490 void update_adapter_trampoline(AdapterHandlerEntry* adapter) { 491 constMethod()->update_adapter_trampoline(adapter); 492 } 493 void set_from_compiled_entry(address entry) { 494 _from_compiled_entry = entry; 495 } 496 497 address get_i2c_entry(); 498 address get_c2i_entry(); 499 address get_c2i_unverified_entry(); 500 address get_c2i_no_clinit_check_entry(); 501 AdapterHandlerEntry* adapter() const { 502 return constMethod()->adapter(); 503 } 504 // setup entry points 505 void link_method(const methodHandle& method, TRAPS); 506 // clear entry points. Used by sharing code during dump time 507 void unlink_method() NOT_CDS_RETURN; 508 509 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 510 virtual MetaspaceObj::Type type() const { return MethodType; } 511 512 // vtable index 513 enum VtableIndexFlag { 514 // Valid vtable indexes are non-negative (>= 0). 515 // These few negative values are used as sentinels. 516 itable_index_max = -10, // first itable index, growing downward 517 pending_itable_index = -9, // itable index will be assigned 518 invalid_vtable_index = -4, // distinct from any valid vtable index 519 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 520 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 521 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 522 }; 523 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 524 bool has_vtable_index() const { return _vtable_index >= 0; } 525 int vtable_index() const { return _vtable_index; } 526 void set_vtable_index(int index); 527 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; }) 528 bool has_itable_index() const { return _vtable_index <= itable_index_max; } 529 int itable_index() const { assert(valid_itable_index(), ""); 530 return itable_index_max - _vtable_index; } 531 void set_itable_index(int index); 532 533 // interpreter entry 534 address interpreter_entry() const { return _i2i_entry; } 535 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 536 void set_interpreter_entry(address entry) { 537 assert(!is_shared(), 538 "shared method's interpreter entry should not be changed at run time"); 539 if (_i2i_entry != entry) { 540 _i2i_entry = entry; 541 } 542 if (_from_interpreted_entry != entry) { 543 _from_interpreted_entry = entry; 544 } 545 } 546 547 // native function (used for native methods only) 548 enum { 549 native_bind_event_is_interesting = true 550 }; 551 address native_function() const { return *(native_function_addr()); } 552 553 // Must specify a real function (not NULL). 554 // Use clear_native_function() to unregister. 555 void set_native_function(address function, bool post_event_flag); 556 bool has_native_function() const; 557 void clear_native_function(); 558 559 // signature handler (used for native methods only) 560 address signature_handler() const { return *(signature_handler_addr()); } 561 void set_signature_handler(address handler); 562 563 // Interpreter oopmap support 564 void mask_for(int bci, InterpreterOopMap* mask); 565 566 // operations on invocation counter 567 void print_invocation_count(); 568 569 // byte codes 570 void set_code(address code) { return constMethod()->set_code(code); } 571 address code_base() const { return constMethod()->code_base(); } 572 bool contains(address bcp) const { return constMethod()->contains(bcp); } 573 574 // prints byte codes 575 void print_codes() const { print_codes_on(tty); } 576 void print_codes_on(outputStream* st) const; 577 void print_codes_on(int from, int to, outputStream* st) const; 578 579 // method parameters 580 bool has_method_parameters() const 581 { return constMethod()->has_method_parameters(); } 582 int method_parameters_length() const 583 { return constMethod()->method_parameters_length(); } 584 MethodParametersElement* method_parameters_start() const 585 { return constMethod()->method_parameters_start(); } 586 587 // checked exceptions 588 int checked_exceptions_length() const 589 { return constMethod()->checked_exceptions_length(); } 590 CheckedExceptionElement* checked_exceptions_start() const 591 { return constMethod()->checked_exceptions_start(); } 592 593 // localvariable table 594 bool has_localvariable_table() const 595 { return constMethod()->has_localvariable_table(); } 596 int localvariable_table_length() const 597 { return constMethod()->localvariable_table_length(); } 598 LocalVariableTableElement* localvariable_table_start() const 599 { return constMethod()->localvariable_table_start(); } 600 601 bool has_linenumber_table() const 602 { return constMethod()->has_linenumber_table(); } 603 u_char* compressed_linenumber_table() const 604 { return constMethod()->compressed_linenumber_table(); } 605 606 // method holder (the Klass* holding this method) 607 InstanceKlass* method_holder() const { return constants()->pool_holder(); } 608 609 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 610 Symbol* klass_name() const; // returns the name of the method holder 611 BasicType result_type() const { return constMethod()->result_type(); } 612 bool is_returning_oop() const { BasicType r = result_type(); return is_reference_type(r); } 613 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 614 615 // Checked exceptions thrown by this method (resolved to mirrors) 616 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 617 618 // Access flags 619 bool is_public() const { return access_flags().is_public(); } 620 bool is_private() const { return access_flags().is_private(); } 621 bool is_protected() const { return access_flags().is_protected(); } 622 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 623 bool is_static() const { return access_flags().is_static(); } 624 bool is_final() const { return access_flags().is_final(); } 625 bool is_synchronized() const { return access_flags().is_synchronized();} 626 bool is_native() const { return access_flags().is_native(); } 627 bool is_abstract() const { return access_flags().is_abstract(); } 628 bool is_strict() const { return access_flags().is_strict(); } 629 bool is_synthetic() const { return access_flags().is_synthetic(); } 630 631 // returns true if contains only return operation 632 bool is_empty_method() const; 633 634 // returns true if this is a vanilla constructor 635 bool is_vanilla_constructor() const; 636 637 // checks method and its method holder 638 bool is_final_method() const; 639 bool is_final_method(AccessFlags class_access_flags) const; 640 // interface method declared with 'default' - excludes private interface methods 641 bool is_default_method() const; 642 643 // true if method needs no dynamic dispatch (final and/or no vtable entry) 644 bool can_be_statically_bound() const; 645 bool can_be_statically_bound(InstanceKlass* context) const; 646 bool can_be_statically_bound(AccessFlags class_access_flags) const; 647 648 // returns true if the method has any backward branches. 649 bool has_loops() { 650 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 651 }; 652 653 bool compute_has_loops_flag(); 654 655 bool has_jsrs() { 656 return access_flags().has_jsrs(); 657 }; 658 void set_has_jsrs() { 659 _access_flags.set_has_jsrs(); 660 } 661 662 // returns true if the method has any monitors. 663 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 664 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 665 666 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 667 668 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 669 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 670 // has not been computed yet. 671 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 672 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 673 674 // returns true if the method is an accessor function (setter/getter). 675 bool is_accessor() const; 676 677 // returns true if the method is a getter 678 bool is_getter() const; 679 680 // returns true if the method is a setter 681 bool is_setter() const; 682 683 // returns true if the method does nothing but return a constant of primitive type 684 bool is_constant_getter() const; 685 686 // returns true if the method is an initializer (<init> or <clinit>). 687 bool is_initializer() const; 688 689 // returns true if the method is static OR if the classfile version < 51 690 bool has_valid_initializer_flags() const; 691 692 // returns true if the method name is <clinit> and the method has 693 // valid static initializer flags. 694 bool is_static_initializer() const; 695 696 // returns true if the method name is <init> 697 bool is_object_initializer() const; 698 699 // compiled code support 700 // NOTE: code() is inherently racy as deopt can be clearing code 701 // simultaneously. Use with caution. 702 bool has_compiled_code() const; 703 704 #ifdef TIERED 705 bool has_aot_code() const { return aot_code() != NULL; } 706 #endif 707 708 bool needs_clinit_barrier() const; 709 710 // sizing 711 static int header_size() { 712 return align_up((int)sizeof(Method), wordSize) / wordSize; 713 } 714 static int size(bool is_native); 715 int size() const { return method_size(); } 716 #if INCLUDE_SERVICES 717 void collect_statistics(KlassSizeStats *sz) const; 718 #endif 719 void log_touched(TRAPS); 720 static void print_touched_methods(outputStream* out); 721 722 // interpreter support 723 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } 724 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } 725 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); } 726 static ByteSize code_offset() { return byte_offset_of(Method, _code); } 727 static ByteSize method_data_offset() { 728 return byte_offset_of(Method, _method_data); 729 } 730 static ByteSize method_counters_offset() { 731 return byte_offset_of(Method, _method_counters); 732 } 733 #ifndef PRODUCT 734 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); } 735 #endif // not PRODUCT 736 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); } 737 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); } 738 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); } 739 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); } 740 static ByteSize itable_index_offset() { return byte_offset_of(Method, _vtable_index ); } 741 742 // for code generation 743 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } 744 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } 745 static int intrinsic_id_size_in_bytes() { return sizeof(u2); } 746 747 // Static methods that are used to implement member methods where an exposed this pointer 748 // is needed due to possible GCs 749 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS); 750 751 // Returns the byte code index from the byte code pointer 752 int bci_from(address bcp) const; 753 address bcp_from(int bci) const; 754 address bcp_from(address bcp) const; 755 int validate_bci_from_bcp(address bcp) const; 756 int validate_bci(int bci) const; 757 758 // Returns the line number for a bci if debugging information for the method is prowided, 759 // -1 is returned otherwise. 760 int line_number_from_bci(int bci) const; 761 762 // Reflection support 763 bool is_overridden_in(Klass* k) const; 764 765 // Stack walking support 766 bool is_ignored_by_security_stack_walk() const; 767 768 // JSR 292 support 769 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) 770 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm 771 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. 772 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual 773 Symbol* signature, //anything at all 774 TRAPS); 775 static Klass* check_non_bcp_klass(Klass* klass); 776 777 enum { 778 // How many extra stack entries for invokedynamic 779 extra_stack_entries_for_jsr292 = 1 780 }; 781 782 // this operates only on invoke methods: 783 // presize interpreter frames for extra interpreter stack entries, if needed 784 // Account for the extra appendix argument for invokehandle/invokedynamic 785 static int extra_stack_entries() { return extra_stack_entries_for_jsr292; } 786 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize 787 788 // RedefineClasses() support: 789 bool is_old() const { return access_flags().is_old(); } 790 void set_is_old() { _access_flags.set_is_old(); } 791 bool is_obsolete() const { return access_flags().is_obsolete(); } 792 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 793 bool is_deleted() const { return access_flags().is_deleted(); } 794 void set_is_deleted() { _access_flags.set_is_deleted(); } 795 796 bool is_running_emcp() const { 797 // EMCP methods are old but not obsolete or deleted. Equivalent 798 // Modulo Constant Pool means the method is equivalent except 799 // the constant pool and instructions that access the constant 800 // pool might be different. 801 // If a breakpoint is set in a redefined method, its EMCP methods that are 802 // still running must have a breakpoint also. 803 return (_flags & _running_emcp) != 0; 804 } 805 806 void set_running_emcp(bool x) { 807 _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp); 808 } 809 810 bool on_stack() const { return access_flags().on_stack(); } 811 void set_on_stack(const bool value); 812 813 // see the definition in Method*.cpp for the gory details 814 bool should_not_be_cached() const; 815 816 // JVMTI Native method prefixing support: 817 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 818 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 819 820 // Rewriting support 821 static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 822 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 823 824 // jmethodID handling 825 // Because the useful life-span of a jmethodID cannot be determined, 826 // once created they are never reclaimed. The methods to which they refer, 827 // however, can be GC'ed away if the class is unloaded or if the method is 828 // made obsolete or deleted -- in these cases, the jmethodID 829 // refers to NULL (as is the case for any weak reference). 830 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh); 831 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid); 832 833 // Ensure there is enough capacity in the internal tracking data 834 // structures to hold the number of jmethodIDs you plan to generate. 835 // This saves substantial time doing allocations. 836 static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity); 837 838 // Use resolve_jmethod_id() in situations where the caller is expected 839 // to provide a valid jmethodID; the only sanity checks are in asserts; 840 // result guaranteed not to be NULL. 841 inline static Method* resolve_jmethod_id(jmethodID mid) { 842 assert(mid != NULL, "JNI method id should not be null"); 843 return *((Method**)mid); 844 } 845 846 // Use checked_resolve_jmethod_id() in situations where the caller 847 // should provide a valid jmethodID, but might not. NULL is returned 848 // when the jmethodID does not refer to a valid method. 849 static Method* checked_resolve_jmethod_id(jmethodID mid); 850 851 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method); 852 static bool is_method_id(jmethodID mid); 853 854 // Clear methods 855 static void clear_jmethod_ids(ClassLoaderData* loader_data); 856 static void print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN; 857 858 // Get this method's jmethodID -- allocate if it doesn't exist 859 jmethodID jmethod_id() { return method_holder()->get_jmethod_id(this); } 860 861 // Lookup the jmethodID for this method. Return NULL if not found. 862 // NOTE that this function can be called from a signal handler 863 // (see AsyncGetCallTrace support for Forte Analyzer) and this 864 // needs to be async-safe. No allocation should be done and 865 // so handles are not used to avoid deadlock. 866 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); } 867 868 // Support for inlining of intrinsic methods 869 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 870 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u2) id; } 871 872 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 873 void init_intrinsic_id(); // updates from _none if a match 874 static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder); 875 876 bool caller_sensitive() { 877 return (_flags & _caller_sensitive) != 0; 878 } 879 void set_caller_sensitive(bool x) { 880 _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive); 881 } 882 883 bool force_inline() { 884 return (_flags & _force_inline) != 0; 885 } 886 void set_force_inline(bool x) { 887 _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline); 888 } 889 890 bool dont_inline() { 891 return (_flags & _dont_inline) != 0; 892 } 893 void set_dont_inline(bool x) { 894 _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline); 895 } 896 897 bool is_hidden() { 898 return (_flags & _hidden) != 0; 899 } 900 void set_hidden(bool x) { 901 _flags = x ? (_flags | _hidden) : (_flags & ~_hidden); 902 } 903 904 bool intrinsic_candidate() { 905 return (_flags & _intrinsic_candidate) != 0; 906 } 907 void set_intrinsic_candidate(bool x) { 908 _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate); 909 } 910 911 bool has_injected_profile() { 912 return (_flags & _has_injected_profile) != 0; 913 } 914 void set_has_injected_profile(bool x) { 915 _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile); 916 } 917 918 bool has_reserved_stack_access() { 919 return (_flags & _reserved_stack_access) != 0; 920 } 921 922 void set_has_reserved_stack_access(bool x) { 923 _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access); 924 } 925 926 JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;) 927 928 ConstMethod::MethodType method_type() const { 929 return _constMethod->method_type(); 930 } 931 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; } 932 933 // On-stack replacement support 934 bool has_osr_nmethod(int level, bool match_level) { 935 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 936 } 937 938 int mark_osr_nmethods() { 939 return method_holder()->mark_osr_nmethods(this); 940 } 941 942 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 943 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level); 944 } 945 946 // Find if klass for method is loaded 947 bool is_klass_loaded_by_klass_index(int klass_index) const; 948 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 949 950 // Indicates whether compilation failed earlier for this method, or 951 // whether it is not compilable for another reason like having a 952 // breakpoint set in it. 953 bool is_not_compilable(int comp_level = CompLevel_any) const; 954 void set_not_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true); 955 void set_not_compilable_quietly(const char* reason, int comp_level = CompLevel_all) { 956 set_not_compilable(reason, comp_level, false); 957 } 958 bool is_not_osr_compilable(int comp_level = CompLevel_any) const; 959 void set_not_osr_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true); 960 void set_not_osr_compilable_quietly(const char* reason, int comp_level = CompLevel_all) { 961 set_not_osr_compilable(reason, comp_level, false); 962 } 963 bool is_always_compilable() const; 964 965 private: 966 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason); 967 968 public: 969 MethodCounters* get_method_counters(TRAPS) { 970 if (_method_counters == NULL) { 971 build_method_counters(this, CHECK_AND_CLEAR_NULL); 972 } 973 return _method_counters; 974 } 975 976 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 977 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 978 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); } 979 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 980 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 981 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); } 982 983 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit 984 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit 985 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit 986 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); } 987 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); } 988 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); } 989 990 // Background compilation support 991 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 992 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 993 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 994 995 // Resolve all classes in signature, return 'true' if successful 996 static bool load_signature_classes(const methodHandle& m, TRAPS); 997 998 // Return if true if not all classes references in signature, including return type, has been loaded 999 static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS); 1000 1001 // Printing 1002 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM 1003 #if INCLUDE_JVMTI 1004 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses 1005 #else 1006 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" 1007 #endif 1008 1009 // Helper routine used for method sorting 1010 static void sort_methods(Array<Method*>* methods, bool set_idnums = true); 1011 1012 // Deallocation function for redefine classes or if an error occurs 1013 void deallocate_contents(ClassLoaderData* loader_data); 1014 1015 void release_C_heap_structures(); 1016 1017 Method* get_new_method() const { 1018 InstanceKlass* holder = method_holder(); 1019 Method* new_method = holder->method_with_idnum(orig_method_idnum()); 1020 1021 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1022 assert(this != new_method, "sanity check"); 1023 return new_method; 1024 } 1025 1026 // Printing 1027 #ifndef PRODUCT 1028 void print_on(outputStream* st) const; 1029 #endif 1030 void print_value_on(outputStream* st) const; 1031 void print_linkage_flags(outputStream* st) PRODUCT_RETURN; 1032 1033 const char* internal_name() const { return "{method}"; } 1034 1035 // Check for valid method pointer 1036 static bool has_method_vptr(const void* ptr); 1037 static bool is_valid_method(const Method* m); 1038 1039 // Verify 1040 void verify() { verify_on(tty); } 1041 void verify_on(outputStream* st); 1042 1043 private: 1044 1045 // Inlined elements 1046 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 1047 address* signature_handler_addr() const { return native_function_addr() + 1; } 1048 }; 1049 1050 1051 // Utility class for compressing line number tables 1052 1053 class CompressedLineNumberWriteStream: public CompressedWriteStream { 1054 private: 1055 int _bci; 1056 int _line; 1057 public: 1058 // Constructor 1059 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 1060 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 1061 1062 // Write (bci, line number) pair to stream 1063 void write_pair_regular(int bci_delta, int line_delta); 1064 1065 // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1066 // we save it as one byte, otherwise we write a 0xFF escape character 1067 // and use regular compression. 0x0 is used as end-of-stream terminator. 1068 void write_pair_inline(int bci, int line); 1069 1070 void write_pair(int bci, int line); 1071 1072 // Write end-of-stream marker 1073 void write_terminator() { write_byte(0); } 1074 }; 1075 1076 1077 // Utility class for decompressing line number tables 1078 1079 class CompressedLineNumberReadStream: public CompressedReadStream { 1080 private: 1081 int _bci; 1082 int _line; 1083 public: 1084 // Constructor 1085 CompressedLineNumberReadStream(u_char* buffer); 1086 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 1087 bool read_pair(); 1088 // Accessing bci and line number (after calling read_pair) 1089 int bci() const { return _bci; } 1090 int line() const { return _line; } 1091 }; 1092 1093 1094 #if INCLUDE_JVMTI 1095 1096 /// Fast Breakpoints. 1097 1098 // If this structure gets more complicated (because bpts get numerous), 1099 // move it into its own header. 1100 1101 // There is presently no provision for concurrent access 1102 // to breakpoint lists, which is only OK for JVMTI because 1103 // breakpoints are written only at safepoints, and are read 1104 // concurrently only outside of safepoints. 1105 1106 class BreakpointInfo : public CHeapObj<mtClass> { 1107 friend class VMStructs; 1108 private: 1109 Bytecodes::Code _orig_bytecode; 1110 int _bci; 1111 u2 _name_index; // of method 1112 u2 _signature_index; // of method 1113 BreakpointInfo* _next; // simple storage allocation 1114 1115 public: 1116 BreakpointInfo(Method* m, int bci); 1117 1118 // accessors 1119 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 1120 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 1121 int bci() { return _bci; } 1122 1123 BreakpointInfo* next() const { return _next; } 1124 void set_next(BreakpointInfo* n) { _next = n; } 1125 1126 // helps for searchers 1127 bool match(const Method* m, int bci) { 1128 return bci == _bci && match(m); 1129 } 1130 1131 bool match(const Method* m) { 1132 return _name_index == m->name_index() && 1133 _signature_index == m->signature_index(); 1134 } 1135 1136 void set(Method* method); 1137 void clear(Method* method); 1138 }; 1139 1140 #endif // INCLUDE_JVMTI 1141 1142 // Utility class for access exception handlers 1143 class ExceptionTable : public StackObj { 1144 private: 1145 ExceptionTableElement* _table; 1146 u2 _length; 1147 1148 public: 1149 ExceptionTable(const Method* m) { 1150 if (m->has_exception_handler()) { 1151 _table = m->exception_table_start(); 1152 _length = m->exception_table_length(); 1153 } else { 1154 _table = NULL; 1155 _length = 0; 1156 } 1157 } 1158 1159 int length() const { 1160 return _length; 1161 } 1162 1163 u2 start_pc(int idx) const { 1164 assert(idx < _length, "out of bounds"); 1165 return _table[idx].start_pc; 1166 } 1167 1168 void set_start_pc(int idx, u2 value) { 1169 assert(idx < _length, "out of bounds"); 1170 _table[idx].start_pc = value; 1171 } 1172 1173 u2 end_pc(int idx) const { 1174 assert(idx < _length, "out of bounds"); 1175 return _table[idx].end_pc; 1176 } 1177 1178 void set_end_pc(int idx, u2 value) { 1179 assert(idx < _length, "out of bounds"); 1180 _table[idx].end_pc = value; 1181 } 1182 1183 u2 handler_pc(int idx) const { 1184 assert(idx < _length, "out of bounds"); 1185 return _table[idx].handler_pc; 1186 } 1187 1188 void set_handler_pc(int idx, u2 value) { 1189 assert(idx < _length, "out of bounds"); 1190 _table[idx].handler_pc = value; 1191 } 1192 1193 u2 catch_type_index(int idx) const { 1194 assert(idx < _length, "out of bounds"); 1195 return _table[idx].catch_type_index; 1196 } 1197 1198 void set_catch_type_index(int idx, u2 value) { 1199 assert(idx < _length, "out of bounds"); 1200 _table[idx].catch_type_index = value; 1201 } 1202 }; 1203 1204 #endif // SHARE_OOPS_METHOD_HPP