1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP 26 #define SHARE_VM_OOPS_METHODOOP_HPP 27 28 #include "classfile/vmSymbols.hpp" 29 #include "code/compressedStream.hpp" 30 #include "compiler/oopMap.hpp" 31 #include "interpreter/invocationCounter.hpp" 32 #include "oops/annotations.hpp" 33 #include "oops/constantPool.hpp" 34 #include "oops/methodCounters.hpp" 35 #include "oops/instanceKlass.hpp" 36 #include "oops/oop.hpp" 37 #include "oops/typeArrayOop.hpp" 38 #include "utilities/accessFlags.hpp" 39 #include "utilities/growableArray.hpp" 40 41 // A Method* represents a Java method. 42 // 43 // Memory layout (each line represents a word). Note that most applications load thousands of methods, 44 // so keeping the size of this structure small has a big impact on footprint. 45 // 46 // We put all oops and method_size first for better gc cache locality. 47 // 48 // The actual bytecodes are inlined after the end of the Method struct. 49 // 50 // There are bits in the access_flags telling whether inlined tables are present. 51 // Note that accessing the line number and local variable tables is not performance critical at all. 52 // Accessing the checked exceptions table is used by reflection, so we put that last to make access 53 // to it fast. 54 // 55 // The line number table is compressed and inlined following the byte codes. It is found as the first 56 // byte following the byte codes. The checked exceptions table and the local variable table are inlined 57 // after the line number table, and indexed from the end of the method. We do not compress the checked 58 // exceptions table since the average length is less than 2, and do not bother to compress the local 59 // variable table either since it is mostly absent. 60 // 61 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter) 62 // 63 // |------------------------------------------------------| 64 // | header | 65 // | klass | 66 // |------------------------------------------------------| 67 // | ConstMethod* (oop) | 68 // |------------------------------------------------------| 69 // | methodData (oop) | 70 // | methodCounters | 71 // |------------------------------------------------------| 72 // | access_flags | 73 // | vtable_index | 74 // |------------------------------------------------------| 75 // | result_index (C++ interpreter only) | 76 // |------------------------------------------------------| 77 // | method_size | intrinsic_id| flags | 78 // |------------------------------------------------------| 79 // | code (pointer) | 80 // | i2i (pointer) | 81 // | adapter (pointer) | 82 // | from_compiled_entry (pointer) | 83 // | from_interpreted_entry (pointer) | 84 // |------------------------------------------------------| 85 // | native_function (present only if native) | 86 // | signature_handler (present only if native) | 87 // |------------------------------------------------------| 88 89 90 class CheckedExceptionElement; 91 class LocalVariableTableElement; 92 class AdapterHandlerEntry; 93 class MethodData; 94 class MethodCounters; 95 class ConstMethod; 96 class InlineTableSizes; 97 class KlassSizeStats; 98 99 class Method : public Metadata { 100 friend class VMStructs; 101 private: 102 ConstMethod* _constMethod; // Method read-only data. 103 MethodData* _method_data; 104 MethodCounters* _method_counters; 105 AccessFlags _access_flags; // Access flags 106 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 107 // note: can have vtables with >2**16 elements (because of inheritance) 108 #ifdef CC_INTERP 109 int _result_index; // C++ interpreter needs for converting results to/from stack 110 #endif 111 u2 _method_size; // size of this object 112 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 113 u1 _jfr_towrite : 1, // Flags 114 _caller_sensitive : 1, 115 _force_inline : 1, 116 _hidden : 1, 117 _dont_inline : 1, 118 : 3; 119 120 #ifndef PRODUCT 121 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 122 #endif 123 // Entry point for calling both from and to the interpreter. 124 address _i2i_entry; // All-args-on-stack calling convention 125 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked. 126 AdapterHandlerEntry* _adapter; 127 // Entry point for calling from compiled code, to compiled code if it exists 128 // or else the interpreter. 129 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 130 // The entry point for calling both from and to compiled code is 131 // "_code->entry_point()". Because of tiered compilation and de-opt, this 132 // field can come and go. It can transition from NULL to not-null at any 133 // time (whenever a compile completes). It can transition from not-null to 134 // NULL only at safepoints (because of a de-opt). 135 nmethod* volatile _code; // Points to the corresponding piece of native code 136 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 137 138 // Constructor 139 Method(ConstMethod* xconst, AccessFlags access_flags, int size); 140 public: 141 142 static Method* allocate(ClassLoaderData* loader_data, 143 int byte_code_size, 144 AccessFlags access_flags, 145 InlineTableSizes* sizes, 146 ConstMethod::MethodType method_type, 147 TRAPS); 148 149 // CDS and vtbl checking can create an empty Method to get vtbl pointer. 150 Method(){} 151 152 // The Method vtable is restored by this call when the Method is in the 153 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for 154 // all the gory details. SA, dtrace and pstack helpers distinguish metadata 155 // by their vtable. 156 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); } 157 bool is_method() const volatile { return true; } 158 159 // accessors for instance variables 160 161 ConstMethod* constMethod() const { return _constMethod; } 162 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; } 163 164 165 static address make_adapters(methodHandle mh, TRAPS); 166 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 167 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 168 169 // access flag 170 AccessFlags access_flags() const { return _access_flags; } 171 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 172 173 // name 174 Symbol* name() const { return constants()->symbol_at(name_index()); } 175 int name_index() const { return constMethod()->name_index(); } 176 void set_name_index(int index) { constMethod()->set_name_index(index); } 177 178 // signature 179 Symbol* signature() const { return constants()->symbol_at(signature_index()); } 180 int signature_index() const { return constMethod()->signature_index(); } 181 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 182 183 // generics support 184 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); } 185 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 186 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 187 188 // annotations support 189 AnnotationArray* annotations() const { 190 return constMethod()->method_annotations(); 191 } 192 AnnotationArray* parameter_annotations() const { 193 return constMethod()->parameter_annotations(); 194 } 195 AnnotationArray* annotation_default() const { 196 return constMethod()->default_annotations(); 197 } 198 AnnotationArray* type_annotations() const { 199 return constMethod()->type_annotations(); 200 } 201 202 #ifdef CC_INTERP 203 void set_result_index(BasicType type); 204 int result_index() { return _result_index; } 205 #endif 206 207 // Helper routine: get klass name + "." + method name + signature as 208 // C string, for the purpose of providing more useful NoSuchMethodErrors 209 // and fatal error handling. The string is allocated in resource 210 // area if a buffer is not provided by the caller. 211 char* name_and_sig_as_C_string() const; 212 char* name_and_sig_as_C_string(char* buf, int size) const; 213 214 // Static routine in the situations we don't have a Method* 215 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); 216 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); 217 218 Bytecodes::Code java_code_at(int bci) const { 219 return Bytecodes::java_code_at(this, bcp_from(bci)); 220 } 221 Bytecodes::Code code_at(int bci) const { 222 return Bytecodes::code_at(this, bcp_from(bci)); 223 } 224 225 // JVMTI breakpoints 226 Bytecodes::Code orig_bytecode_at(int bci) const; 227 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 228 void set_breakpoint(int bci); 229 void clear_breakpoint(int bci); 230 void clear_all_breakpoints(); 231 // Tracking number of breakpoints, for fullspeed debugging. 232 // Only mutated by VM thread. 233 u2 number_of_breakpoints() const { 234 if (method_counters() == NULL) { 235 return 0; 236 } else { 237 return method_counters()->number_of_breakpoints(); 238 } 239 } 240 void incr_number_of_breakpoints(TRAPS) { 241 MethodCounters* mcs = get_method_counters(CHECK); 242 if (mcs != NULL) { 243 mcs->incr_number_of_breakpoints(); 244 } 245 } 246 void decr_number_of_breakpoints(TRAPS) { 247 MethodCounters* mcs = get_method_counters(CHECK); 248 if (mcs != NULL) { 249 mcs->decr_number_of_breakpoints(); 250 } 251 } 252 // Initialization only 253 void clear_number_of_breakpoints() { 254 if (method_counters() != NULL) { 255 method_counters()->clear_number_of_breakpoints(); 256 } 257 } 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 // code size 265 int code_size() const { return constMethod()->code_size(); } 266 267 // method size 268 int method_size() const { return _method_size; } 269 void set_method_size(int size) { 270 assert(0 <= size && size < (1 << 16), "invalid method size"); 271 _method_size = size; 272 } 273 274 // constant pool for Klass* holding this method 275 ConstantPool* constants() const { return constMethod()->constants(); } 276 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); } 277 278 // max stack 279 // return original max stack size for method verification 280 int verifier_max_stack() const { return constMethod()->max_stack(); } 281 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); } 282 void set_max_stack(int size) { constMethod()->set_max_stack(size); } 283 284 // max locals 285 int max_locals() const { return constMethod()->max_locals(); } 286 void set_max_locals(int size) { constMethod()->set_max_locals(size); } 287 288 int highest_comp_level() const; 289 void set_highest_comp_level(int level); 290 int highest_osr_comp_level() const; 291 void set_highest_osr_comp_level(int level); 292 293 // 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 } 300 301 int interpreter_throwout_count() const { 302 if (method_counters() == NULL) { 303 return 0; 304 } else { 305 return method_counters()->interpreter_throwout_count(); 306 } 307 } 308 309 // size of parameters 310 int size_of_parameters() const { return constMethod()->size_of_parameters(); } 311 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); } 312 313 bool has_stackmap_table() const { 314 return constMethod()->has_stackmap_table(); 315 } 316 317 Array<u1>* stackmap_data() const { 318 return constMethod()->stackmap_data(); 319 } 320 321 void set_stackmap_data(Array<u1>* sd) { 322 constMethod()->set_stackmap_data(sd); 323 } 324 325 // exception handler table 326 bool has_exception_handler() const 327 { return constMethod()->has_exception_handler(); } 328 int exception_table_length() const 329 { return constMethod()->exception_table_length(); } 330 ExceptionTableElement* exception_table_start() const 331 { return constMethod()->exception_table_start(); } 332 333 // Finds the first entry point bci of an exception handler for an 334 // exception of klass ex_klass thrown at throw_bci. A value of NULL 335 // for ex_klass indicates that the exception klass is not known; in 336 // this case it matches any constraint class. Returns -1 if the 337 // exception cannot be handled in this method. The handler 338 // constraint classes are loaded if necessary. Note that this may 339 // throw an exception if loading of the constraint classes causes 340 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 341 // If an exception is thrown, returns the bci of the 342 // exception handler which caused the exception to be thrown, which 343 // is needed for proper retries. See, for example, 344 // InterpreterRuntime::exception_handler_for_exception. 345 static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS); 346 347 // method data access 348 MethodData* method_data() const { 349 return _method_data; 350 } 351 352 void set_method_data(MethodData* data) { 353 _method_data = data; 354 } 355 356 MethodCounters* method_counters() const { 357 return _method_counters; 358 } 359 360 361 void set_method_counters(MethodCounters* counters) { 362 _method_counters = counters; 363 } 364 365 #ifdef TIERED 366 // We are reusing interpreter_invocation_count as a holder for the previous event count! 367 // We can do that since interpreter_invocation_count is not used in tiered. 368 int prev_event_count() const { 369 if (method_counters() == NULL) { 370 return 0; 371 } else { 372 return method_counters()->interpreter_invocation_count(); 373 } 374 } 375 void set_prev_event_count(int count, TRAPS) { 376 MethodCounters* mcs = get_method_counters(CHECK); 377 if (mcs != NULL) { 378 mcs->set_interpreter_invocation_count(count); 379 } 380 } 381 jlong prev_time() const { 382 return method_counters() == NULL ? 0 : method_counters()->prev_time(); 383 } 384 void set_prev_time(jlong time, TRAPS) { 385 MethodCounters* mcs = get_method_counters(CHECK); 386 if (mcs != NULL) { 387 mcs->set_prev_time(time); 388 } 389 } 390 float rate() const { 391 return method_counters() == NULL ? 0 : method_counters()->rate(); 392 } 393 void set_rate(float rate, TRAPS) { 394 MethodCounters* mcs = get_method_counters(CHECK); 395 if (mcs != NULL) { 396 mcs->set_rate(rate); 397 } 398 } 399 #endif 400 401 int invocation_count(); 402 int backedge_count(); 403 404 bool was_executed_more_than(int n); 405 bool was_never_executed() { return !was_executed_more_than(0); } 406 407 static void build_interpreter_method_data(methodHandle method, TRAPS); 408 409 static MethodCounters* build_method_counters(Method* m, TRAPS); 410 411 int interpreter_invocation_count() { 412 if (TieredCompilation) return invocation_count(); 413 else return (method_counters() == NULL) ? 0 : 414 method_counters()->interpreter_invocation_count(); 415 } 416 int increment_interpreter_invocation_count(TRAPS) { 417 if (TieredCompilation) ShouldNotReachHere(); 418 MethodCounters* mcs = get_method_counters(CHECK_0); 419 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count(); 420 } 421 422 #ifndef PRODUCT 423 int compiled_invocation_count() const { return _compiled_invocation_count; } 424 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 425 #endif // not PRODUCT 426 427 // Clear (non-shared space) pointers which could not be relevant 428 // if this (shared) method were mapped into another JVM. 429 void remove_unshareable_info(); 430 431 // nmethod/verified compiler entry 432 address verified_code_entry(); 433 bool check_code() const; // Not inline to avoid circular ref 434 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 435 void clear_code(); // Clear out any compiled code 436 static void set_code(methodHandle mh, nmethod* code); 437 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 438 address get_i2c_entry(); 439 address get_c2i_entry(); 440 address get_c2i_unverified_entry(); 441 AdapterHandlerEntry* adapter() { return _adapter; } 442 // setup entry points 443 void link_method(methodHandle method, TRAPS); 444 // clear entry points. Used by sharing code 445 void unlink_method(); 446 447 // vtable index 448 enum VtableIndexFlag { 449 // Valid vtable indexes are non-negative (>= 0). 450 // These few negative values are used as sentinels. 451 itable_index_max = -10, // first itable index, growing downward 452 pending_itable_index = -9, // itable index will be assigned 453 invalid_vtable_index = -4, // distinct from any valid vtable index 454 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 455 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 456 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 457 }; 458 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 459 bool has_vtable_index() const { return _vtable_index >= 0; } 460 int vtable_index() const { return _vtable_index; } 461 void set_vtable_index(int index) { _vtable_index = index; } 462 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; }) 463 bool has_itable_index() const { return _vtable_index <= itable_index_max; } 464 int itable_index() const { assert(valid_itable_index(), ""); 465 return itable_index_max - _vtable_index; } 466 void set_itable_index(int index) { _vtable_index = itable_index_max - index; assert(valid_itable_index(), ""); } 467 468 // interpreter entry 469 address interpreter_entry() const { return _i2i_entry; } 470 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 471 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 472 473 // native function (used for native methods only) 474 enum { 475 native_bind_event_is_interesting = true 476 }; 477 address native_function() const { return *(native_function_addr()); } 478 address critical_native_function(); 479 480 // Must specify a real function (not NULL). 481 // Use clear_native_function() to unregister. 482 void set_native_function(address function, bool post_event_flag); 483 bool has_native_function() const; 484 void clear_native_function(); 485 486 // signature handler (used for native methods only) 487 address signature_handler() const { return *(signature_handler_addr()); } 488 void set_signature_handler(address handler); 489 490 // Interpreter oopmap support 491 void mask_for(int bci, InterpreterOopMap* mask); 492 493 #ifndef PRODUCT 494 // operations on invocation counter 495 void print_invocation_count(); 496 #endif 497 498 // byte codes 499 void set_code(address code) { return constMethod()->set_code(code); } 500 address code_base() const { return constMethod()->code_base(); } 501 bool contains(address bcp) const { return constMethod()->contains(bcp); } 502 503 // prints byte codes 504 void print_codes() const { print_codes_on(tty); } 505 void print_codes_on(outputStream* st) const PRODUCT_RETURN; 506 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; 507 508 // method parameters 509 bool has_method_parameters() const 510 { return constMethod()->has_method_parameters(); } 511 int method_parameters_length() const 512 { return constMethod()->method_parameters_length(); } 513 MethodParametersElement* method_parameters_start() const 514 { return constMethod()->method_parameters_start(); } 515 516 // checked exceptions 517 int checked_exceptions_length() const 518 { return constMethod()->checked_exceptions_length(); } 519 CheckedExceptionElement* checked_exceptions_start() const 520 { return constMethod()->checked_exceptions_start(); } 521 522 // localvariable table 523 bool has_localvariable_table() const 524 { return constMethod()->has_localvariable_table(); } 525 int localvariable_table_length() const 526 { return constMethod()->localvariable_table_length(); } 527 LocalVariableTableElement* localvariable_table_start() const 528 { return constMethod()->localvariable_table_start(); } 529 530 bool has_linenumber_table() const 531 { return constMethod()->has_linenumber_table(); } 532 u_char* compressed_linenumber_table() const 533 { return constMethod()->compressed_linenumber_table(); } 534 535 // method holder (the Klass* holding this method) 536 InstanceKlass* method_holder() const { return constants()->pool_holder(); } 537 538 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 539 Symbol* klass_name() const; // returns the name of the method holder 540 BasicType result_type() const; // type of the method result 541 int result_type_index() const; // type index of the method result 542 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 543 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 544 545 // Checked exceptions thrown by this method (resolved to mirrors) 546 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 547 548 // Access flags 549 bool is_public() const { return access_flags().is_public(); } 550 bool is_private() const { return access_flags().is_private(); } 551 bool is_protected() const { return access_flags().is_protected(); } 552 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 553 bool is_static() const { return access_flags().is_static(); } 554 bool is_final() const { return access_flags().is_final(); } 555 bool is_synchronized() const { return access_flags().is_synchronized();} 556 bool is_native() const { return access_flags().is_native(); } 557 bool is_abstract() const { return access_flags().is_abstract(); } 558 bool is_strict() const { return access_flags().is_strict(); } 559 bool is_synthetic() const { return access_flags().is_synthetic(); } 560 561 // returns true if contains only return operation 562 bool is_empty_method() const; 563 564 // returns true if this is a vanilla constructor 565 bool is_vanilla_constructor() const; 566 567 // checks method and its method holder 568 bool is_final_method() const; 569 bool is_final_method(AccessFlags class_access_flags) const; 570 571 // true if method needs no dynamic dispatch (final and/or no vtable entry) 572 bool can_be_statically_bound() const; 573 bool can_be_statically_bound(AccessFlags class_access_flags) const; 574 575 // returns true if the method has any backward branches. 576 bool has_loops() { 577 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 578 }; 579 580 bool compute_has_loops_flag(); 581 582 bool has_jsrs() { 583 return access_flags().has_jsrs(); 584 }; 585 void set_has_jsrs() { 586 _access_flags.set_has_jsrs(); 587 } 588 589 // returns true if the method has any monitors. 590 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 591 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 592 593 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 594 595 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 596 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 597 // has not been computed yet. 598 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 599 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 600 601 // returns true if the method is an accessor function (setter/getter). 602 bool is_accessor() const; 603 604 // returns true if the method is an initializer (<init> or <clinit>). 605 bool is_initializer() const; 606 607 // returns true if the method is static OR if the classfile version < 51 608 bool has_valid_initializer_flags() const; 609 610 // returns true if the method name is <clinit> and the method has 611 // valid static initializer flags. 612 bool is_static_initializer() const; 613 614 // compiled code support 615 // NOTE: code() is inherently racy as deopt can be clearing code 616 // simultaneously. Use with caution. 617 bool has_compiled_code() const { return code() != NULL; } 618 619 // sizing 620 static int header_size() { return sizeof(Method)/HeapWordSize; } 621 static int size(bool is_native); 622 int size() const { return method_size(); } 623 #if INCLUDE_SERVICES 624 void collect_statistics(KlassSizeStats *sz) const; 625 #endif 626 627 // interpreter support 628 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } 629 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } 630 #ifdef CC_INTERP 631 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); } 632 #endif /* CC_INTERP */ 633 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); } 634 static ByteSize code_offset() { return byte_offset_of(Method, _code); } 635 static ByteSize method_data_offset() { 636 return byte_offset_of(Method, _method_data); 637 } 638 static ByteSize method_counters_offset() { 639 return byte_offset_of(Method, _method_counters); 640 } 641 #ifndef PRODUCT 642 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); } 643 #endif // not PRODUCT 644 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); } 645 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); } 646 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); } 647 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); } 648 649 // for code generation 650 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } 651 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } 652 static int intrinsic_id_size_in_bytes() { return sizeof(u1); } 653 654 // Static methods that are used to implement member methods where an exposed this pointer 655 // is needed due to possible GCs 656 static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS); 657 658 // Returns the byte code index from the byte code pointer 659 int bci_from(address bcp) const; 660 address bcp_from(int bci) const; 661 int validate_bci_from_bcx(intptr_t bcx) const; 662 663 // Returns the line number for a bci if debugging information for the method is prowided, 664 // -1 is returned otherwise. 665 int line_number_from_bci(int bci) const; 666 667 // Reflection support 668 bool is_overridden_in(Klass* k) const; 669 670 // Stack walking support 671 bool is_ignored_by_security_stack_walk() const; 672 673 // JSR 292 support 674 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) 675 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm 676 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. 677 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual 678 Symbol* signature, //anything at all 679 TRAPS); 680 static Klass* check_non_bcp_klass(Klass* klass); 681 682 // How many extra stack entries for invokedynamic when it's enabled 683 static const int extra_stack_entries_for_jsr292 = 1; 684 685 // this operates only on invoke methods: 686 // presize interpreter frames for extra interpreter stack entries, if needed 687 // Account for the extra appendix argument for invokehandle/invokedynamic 688 static int extra_stack_entries() { return EnableInvokeDynamic ? extra_stack_entries_for_jsr292 : 0; } 689 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize 690 691 // RedefineClasses() support: 692 bool is_old() const { return access_flags().is_old(); } 693 void set_is_old() { _access_flags.set_is_old(); } 694 bool is_obsolete() const { return access_flags().is_obsolete(); } 695 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 696 bool on_stack() const { return access_flags().on_stack(); } 697 void set_on_stack(const bool value); 698 699 // see the definition in Method*.cpp for the gory details 700 bool should_not_be_cached() const; 701 702 // JVMTI Native method prefixing support: 703 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 704 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 705 706 // Rewriting support 707 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 708 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 709 710 // jmethodID handling 711 // Because the useful life-span of a jmethodID cannot be determined, 712 // once created they are never reclaimed. The methods to which they refer, 713 // however, can be GC'ed away if the class is unloaded or if the method is 714 // made obsolete or deleted -- in these cases, the jmethodID 715 // refers to NULL (as is the case for any weak reference). 716 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh); 717 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid); 718 719 // Use resolve_jmethod_id() in situations where the caller is expected 720 // to provide a valid jmethodID; the only sanity checks are in asserts; 721 // result guaranteed not to be NULL. 722 inline static Method* resolve_jmethod_id(jmethodID mid) { 723 assert(mid != NULL, "JNI method id should not be null"); 724 return *((Method**)mid); 725 } 726 727 // Use checked_resolve_jmethod_id() in situations where the caller 728 // should provide a valid jmethodID, but might not. NULL is returned 729 // when the jmethodID does not refer to a valid method. 730 static Method* checked_resolve_jmethod_id(jmethodID mid); 731 732 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method); 733 static bool is_method_id(jmethodID mid); 734 735 // Clear methods 736 static void clear_jmethod_ids(ClassLoaderData* loader_data); 737 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN; 738 739 // Get this method's jmethodID -- allocate if it doesn't exist 740 jmethodID jmethod_id() { methodHandle this_h(this); 741 return InstanceKlass::get_jmethod_id(method_holder(), this_h); } 742 743 // Lookup the jmethodID for this method. Return NULL if not found. 744 // NOTE that this function can be called from a signal handler 745 // (see AsyncGetCallTrace support for Forte Analyzer) and this 746 // needs to be async-safe. No allocation should be done and 747 // so handles are not used to avoid deadlock. 748 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); } 749 750 // Support for inlining of intrinsic methods 751 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 752 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 753 754 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 755 void init_intrinsic_id(); // updates from _none if a match 756 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder); 757 758 bool jfr_towrite() { return _jfr_towrite; } 759 void set_jfr_towrite(bool x) { _jfr_towrite = x; } 760 bool caller_sensitive() { return _caller_sensitive; } 761 void set_caller_sensitive(bool x) { _caller_sensitive = x; } 762 bool force_inline() { return _force_inline; } 763 void set_force_inline(bool x) { _force_inline = x; } 764 bool dont_inline() { return _dont_inline; } 765 void set_dont_inline(bool x) { _dont_inline = x; } 766 bool is_hidden() { return _hidden; } 767 void set_hidden(bool x) { _hidden = x; } 768 ConstMethod::MethodType method_type() const { 769 return _constMethod->method_type(); 770 } 771 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; } 772 773 // On-stack replacement support 774 bool has_osr_nmethod(int level, bool match_level) { 775 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 776 } 777 778 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 779 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level); 780 } 781 782 // Inline cache support 783 void cleanup_inline_caches(); 784 785 // Find if klass for method is loaded 786 bool is_klass_loaded_by_klass_index(int klass_index) const; 787 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 788 789 // Indicates whether compilation failed earlier for this method, or 790 // whether it is not compilable for another reason like having a 791 // breakpoint set in it. 792 bool is_not_compilable(int comp_level = CompLevel_any) const; 793 void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); 794 void set_not_compilable_quietly(int comp_level = CompLevel_all) { 795 set_not_compilable(comp_level, false); 796 } 797 bool is_not_osr_compilable(int comp_level = CompLevel_any) const; 798 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); 799 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) { 800 set_not_osr_compilable(comp_level, false); 801 } 802 803 private: 804 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason); 805 806 MethodCounters* get_method_counters(TRAPS) { 807 if (_method_counters == NULL) { 808 build_method_counters(this, CHECK_AND_CLEAR_NULL); 809 } 810 return _method_counters; 811 } 812 813 public: 814 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 815 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 816 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); } 817 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 818 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 819 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); } 820 821 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit 822 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit 823 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit 824 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); } 825 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); } 826 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); } 827 828 // Background compilation support 829 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 830 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 831 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 832 833 // Resolve all classes in signature, return 'true' if successful 834 static bool load_signature_classes(methodHandle m, TRAPS); 835 836 // Return if true if not all classes references in signature, including return type, has been loaded 837 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 838 839 // Printing 840 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM 841 #if INCLUDE_JVMTI 842 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses 843 #else 844 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" 845 #endif 846 847 // Helper routine used for method sorting 848 static void sort_methods(Array<Method*>* methods, bool idempotent = false); 849 850 // Deallocation function for redefine classes or if an error occurs 851 void deallocate_contents(ClassLoaderData* loader_data); 852 853 // Printing 854 #ifndef PRODUCT 855 void print_on(outputStream* st) const; 856 #endif 857 void print_value_on(outputStream* st) const; 858 859 const char* internal_name() const { return "{method}"; } 860 861 // Check for valid method pointer 862 bool is_valid_method() const; 863 864 // Verify 865 void verify() { verify_on(tty); } 866 void verify_on(outputStream* st); 867 868 private: 869 870 // Inlined elements 871 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 872 address* signature_handler_addr() const { return native_function_addr() + 1; } 873 }; 874 875 876 // Utility class for compressing line number tables 877 878 class CompressedLineNumberWriteStream: public CompressedWriteStream { 879 private: 880 int _bci; 881 int _line; 882 public: 883 // Constructor 884 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 885 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 886 887 // Write (bci, line number) pair to stream 888 void write_pair_regular(int bci_delta, int line_delta); 889 890 inline void write_pair_inline(int bci, int line) { 891 int bci_delta = bci - _bci; 892 int line_delta = line - _line; 893 _bci = bci; 894 _line = line; 895 // Skip (0,0) deltas - they do not add information and conflict with terminator. 896 if (bci_delta == 0 && line_delta == 0) return; 897 // Check if bci is 5-bit and line number 3-bit unsigned. 898 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 899 // Compress into single byte. 900 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 901 // Check that value doesn't match escape character. 902 if (value != 0xFF) { 903 write_byte(value); 904 return; 905 } 906 } 907 write_pair_regular(bci_delta, line_delta); 908 } 909 910 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 911 // Disabling optimization doesn't work for methods in header files 912 // so we force it to call through the non-optimized version in the .cpp. 913 // It's gross, but it's the only way we can ensure that all callers are 914 // fixed. _MSC_VER is defined by the windows compiler 915 #if defined(_M_AMD64) && _MSC_VER >= 1400 916 void write_pair(int bci, int line); 917 #else 918 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 919 #endif 920 921 // Write end-of-stream marker 922 void write_terminator() { write_byte(0); } 923 }; 924 925 926 // Utility class for decompressing line number tables 927 928 class CompressedLineNumberReadStream: public CompressedReadStream { 929 private: 930 int _bci; 931 int _line; 932 public: 933 // Constructor 934 CompressedLineNumberReadStream(u_char* buffer); 935 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 936 bool read_pair(); 937 // Accessing bci and line number (after calling read_pair) 938 int bci() const { return _bci; } 939 int line() const { return _line; } 940 }; 941 942 943 /// Fast Breakpoints. 944 945 // If this structure gets more complicated (because bpts get numerous), 946 // move it into its own header. 947 948 // There is presently no provision for concurrent access 949 // to breakpoint lists, which is only OK for JVMTI because 950 // breakpoints are written only at safepoints, and are read 951 // concurrently only outside of safepoints. 952 953 class BreakpointInfo : public CHeapObj<mtClass> { 954 friend class VMStructs; 955 private: 956 Bytecodes::Code _orig_bytecode; 957 int _bci; 958 u2 _name_index; // of method 959 u2 _signature_index; // of method 960 BreakpointInfo* _next; // simple storage allocation 961 962 public: 963 BreakpointInfo(Method* m, int bci); 964 965 // accessors 966 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 967 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 968 int bci() { return _bci; } 969 970 BreakpointInfo* next() const { return _next; } 971 void set_next(BreakpointInfo* n) { _next = n; } 972 973 // helps for searchers 974 bool match(const Method* m, int bci) { 975 return bci == _bci && match(m); 976 } 977 978 bool match(const Method* m) { 979 return _name_index == m->name_index() && 980 _signature_index == m->signature_index(); 981 } 982 983 void set(Method* method); 984 void clear(Method* method); 985 }; 986 987 // Utility class for access exception handlers 988 class ExceptionTable : public StackObj { 989 private: 990 ExceptionTableElement* _table; 991 u2 _length; 992 993 public: 994 ExceptionTable(const Method* m) { 995 if (m->has_exception_handler()) { 996 _table = m->exception_table_start(); 997 _length = m->exception_table_length(); 998 } else { 999 _table = NULL; 1000 _length = 0; 1001 } 1002 } 1003 1004 int length() const { 1005 return _length; 1006 } 1007 1008 u2 start_pc(int idx) const { 1009 assert(idx < _length, "out of bounds"); 1010 return _table[idx].start_pc; 1011 } 1012 1013 void set_start_pc(int idx, u2 value) { 1014 assert(idx < _length, "out of bounds"); 1015 _table[idx].start_pc = value; 1016 } 1017 1018 u2 end_pc(int idx) const { 1019 assert(idx < _length, "out of bounds"); 1020 return _table[idx].end_pc; 1021 } 1022 1023 void set_end_pc(int idx, u2 value) { 1024 assert(idx < _length, "out of bounds"); 1025 _table[idx].end_pc = value; 1026 } 1027 1028 u2 handler_pc(int idx) const { 1029 assert(idx < _length, "out of bounds"); 1030 return _table[idx].handler_pc; 1031 } 1032 1033 void set_handler_pc(int idx, u2 value) { 1034 assert(idx < _length, "out of bounds"); 1035 _table[idx].handler_pc = value; 1036 } 1037 1038 u2 catch_type_index(int idx) const { 1039 assert(idx < _length, "out of bounds"); 1040 return _table[idx].catch_type_index; 1041 } 1042 1043 void set_catch_type_index(int idx, u2 value) { 1044 assert(idx < _length, "out of bounds"); 1045 _table[idx].catch_type_index = value; 1046 } 1047 }; 1048 1049 #endif // SHARE_VM_OOPS_METHODOOP_HPP