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