method.hpp revision 6225:7cf6868b207a
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_OOPS_METHODOOP_HPP 26#define SHARE_VM_OOPS_METHODOOP_HPP 27 28#include "classfile/vmSymbols.hpp" 29#include "code/compressedStream.hpp" 30#include "compiler/oopMap.hpp" 31#include "interpreter/invocationCounter.hpp" 32#include "oops/annotations.hpp" 33#include "oops/constantPool.hpp" 34#include "oops/methodCounters.hpp" 35#include "oops/instanceKlass.hpp" 36#include "oops/oop.hpp" 37#include "oops/typeArrayOop.hpp" 38#include "utilities/accessFlags.hpp" 39#include "utilities/growableArray.hpp" 40 41// A Method represents a Java method. 42// 43// Note that most applications load thousands of methods, so keeping the size of this 44// class small has a big impact on footprint. 45// 46// Note that native_function and signature_handler have to be at fixed offsets 47// (required by the interpreter) 48// 49// Method embedded field layout (after declared fields): 50// [EMBEDDED native_function (present only if native) ] 51// [EMBEDDED signature_handler (present only if native) ] 52 53class CheckedExceptionElement; 54class LocalVariableTableElement; 55class AdapterHandlerEntry; 56class MethodData; 57class MethodCounters; 58class ConstMethod; 59class InlineTableSizes; 60class KlassSizeStats; 61 62class Method : public Metadata { 63 friend class VMStructs; 64 private: 65 ConstMethod* _constMethod; // Method read-only data. 66 MethodData* _method_data; 67 MethodCounters* _method_counters; 68 AccessFlags _access_flags; // Access flags 69 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 70 // note: can have vtables with >2**16 elements (because of inheritance) 71#ifdef CC_INTERP 72 int _result_index; // C++ interpreter needs for converting results to/from stack 73#endif 74 u2 _method_size; // size of this object 75 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 76 77 // Flags 78 enum Flags { 79 _jfr_towrite = 1 << 0, 80 _caller_sensitive = 1 << 1, 81 _force_inline = 1 << 2, 82 _dont_inline = 1 << 3, 83 _hidden = 1 << 4 84 }; 85 u1 _flags; 86 87#ifndef PRODUCT 88 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 89#endif 90 // Entry point for calling both from and to the interpreter. 91 address _i2i_entry; // All-args-on-stack calling convention 92 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked. 93 AdapterHandlerEntry* _adapter; 94 // Entry point for calling from compiled code, to compiled code if it exists 95 // or else the interpreter. 96 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 97 // The entry point for calling both from and to compiled code is 98 // "_code->entry_point()". Because of tiered compilation and de-opt, this 99 // field can come and go. It can transition from NULL to not-null at any 100 // time (whenever a compile completes). It can transition from not-null to 101 // NULL only at safepoints (because of a de-opt). 102 nmethod* volatile _code; // Points to the corresponding piece of native code 103 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 104 105 // Constructor 106 Method(ConstMethod* xconst, AccessFlags access_flags, int size); 107 public: 108 109 static Method* allocate(ClassLoaderData* loader_data, 110 int byte_code_size, 111 AccessFlags access_flags, 112 InlineTableSizes* sizes, 113 ConstMethod::MethodType method_type, 114 TRAPS); 115 116 // CDS and vtbl checking can create an empty Method to get vtbl pointer. 117 Method(){} 118 119 // The Method vtable is restored by this call when the Method is in the 120 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for 121 // all the gory details. SA, dtrace and pstack helpers distinguish metadata 122 // by their vtable. 123 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); } 124 bool is_method() const volatile { return true; } 125 126 // accessors for instance variables 127 128 ConstMethod* constMethod() const { return _constMethod; } 129 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; } 130 131 132 static address make_adapters(methodHandle mh, TRAPS); 133 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 134 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 135 136 // access flag 137 AccessFlags access_flags() const { return _access_flags; } 138 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 139 140 // name 141 Symbol* name() const { return constants()->symbol_at(name_index()); } 142 int name_index() const { return constMethod()->name_index(); } 143 void set_name_index(int index) { constMethod()->set_name_index(index); } 144 145 // signature 146 Symbol* signature() const { return constants()->symbol_at(signature_index()); } 147 int signature_index() const { return constMethod()->signature_index(); } 148 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 149 150 // generics support 151 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); } 152 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 153 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 154 155 // annotations support 156 AnnotationArray* annotations() const { 157 return constMethod()->method_annotations(); 158 } 159 AnnotationArray* parameter_annotations() const { 160 return constMethod()->parameter_annotations(); 161 } 162 AnnotationArray* annotation_default() const { 163 return constMethod()->default_annotations(); 164 } 165 AnnotationArray* type_annotations() const { 166 return constMethod()->type_annotations(); 167 } 168 169#ifdef CC_INTERP 170 void set_result_index(BasicType type); 171 int result_index() { return _result_index; } 172#endif 173 174 // Helper routine: get klass name + "." + method name + signature as 175 // C string, for the purpose of providing more useful NoSuchMethodErrors 176 // and fatal error handling. The string is allocated in resource 177 // area if a buffer is not provided by the caller. 178 char* name_and_sig_as_C_string() const; 179 char* name_and_sig_as_C_string(char* buf, int size) const; 180 181 // Static routine in the situations we don't have a Method* 182 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); 183 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); 184 185 Bytecodes::Code java_code_at(int bci) const { 186 return Bytecodes::java_code_at(this, bcp_from(bci)); 187 } 188 Bytecodes::Code code_at(int bci) const { 189 return Bytecodes::code_at(this, bcp_from(bci)); 190 } 191 192 // JVMTI breakpoints 193 Bytecodes::Code orig_bytecode_at(int bci) const; 194 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 195 void set_breakpoint(int bci); 196 void clear_breakpoint(int bci); 197 void clear_all_breakpoints(); 198 // Tracking number of breakpoints, for fullspeed debugging. 199 // Only mutated by VM thread. 200 u2 number_of_breakpoints() const { 201 if (method_counters() == NULL) { 202 return 0; 203 } else { 204 return method_counters()->number_of_breakpoints(); 205 } 206 } 207 void incr_number_of_breakpoints(TRAPS) { 208 MethodCounters* mcs = get_method_counters(CHECK); 209 if (mcs != NULL) { 210 mcs->incr_number_of_breakpoints(); 211 } 212 } 213 void decr_number_of_breakpoints(TRAPS) { 214 MethodCounters* mcs = get_method_counters(CHECK); 215 if (mcs != NULL) { 216 mcs->decr_number_of_breakpoints(); 217 } 218 } 219 // Initialization only 220 void clear_number_of_breakpoints() { 221 if (method_counters() != NULL) { 222 method_counters()->clear_number_of_breakpoints(); 223 } 224 } 225 226 // index into InstanceKlass methods() array 227 // note: also used by jfr 228 u2 method_idnum() const { return constMethod()->method_idnum(); } 229 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 230 231 // code size 232 int code_size() const { return constMethod()->code_size(); } 233 234 // method size 235 int method_size() const { return _method_size; } 236 void set_method_size(int size) { 237 assert(0 <= size && size < (1 << 16), "invalid method size"); 238 _method_size = size; 239 } 240 241 // constant pool for Klass* holding this method 242 ConstantPool* constants() const { return constMethod()->constants(); } 243 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); } 244 245 // max stack 246 // return original max stack size for method verification 247 int verifier_max_stack() const { return constMethod()->max_stack(); } 248 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); } 249 void set_max_stack(int size) { constMethod()->set_max_stack(size); } 250 251 // max locals 252 int max_locals() const { return constMethod()->max_locals(); } 253 void set_max_locals(int size) { constMethod()->set_max_locals(size); } 254 255 int highest_comp_level() const; 256 void set_highest_comp_level(int level); 257 int highest_osr_comp_level() const; 258 void set_highest_osr_comp_level(int level); 259 260 // Count of times method was exited via exception while interpreting 261 void interpreter_throwout_increment(TRAPS) { 262 MethodCounters* mcs = get_method_counters(CHECK); 263 if (mcs != NULL) { 264 mcs->interpreter_throwout_increment(); 265 } 266 } 267 268 int interpreter_throwout_count() const { 269 if (method_counters() == NULL) { 270 return 0; 271 } else { 272 return method_counters()->interpreter_throwout_count(); 273 } 274 } 275 276 // size of parameters 277 int size_of_parameters() const { return constMethod()->size_of_parameters(); } 278 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); } 279 280 bool has_stackmap_table() const { 281 return constMethod()->has_stackmap_table(); 282 } 283 284 Array<u1>* stackmap_data() const { 285 return constMethod()->stackmap_data(); 286 } 287 288 void set_stackmap_data(Array<u1>* sd) { 289 constMethod()->set_stackmap_data(sd); 290 } 291 292 // exception handler table 293 bool has_exception_handler() const 294 { return constMethod()->has_exception_handler(); } 295 int exception_table_length() const 296 { return constMethod()->exception_table_length(); } 297 ExceptionTableElement* exception_table_start() const 298 { return constMethod()->exception_table_start(); } 299 300 // Finds the first entry point bci of an exception handler for an 301 // exception of klass ex_klass thrown at throw_bci. A value of NULL 302 // for ex_klass indicates that the exception klass is not known; in 303 // this case it matches any constraint class. Returns -1 if the 304 // exception cannot be handled in this method. The handler 305 // constraint classes are loaded if necessary. Note that this may 306 // throw an exception if loading of the constraint classes causes 307 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 308 // If an exception is thrown, returns the bci of the 309 // exception handler which caused the exception to be thrown, which 310 // is needed for proper retries. See, for example, 311 // InterpreterRuntime::exception_handler_for_exception. 312 static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS); 313 314 // method data access 315 MethodData* method_data() const { 316 return _method_data; 317 } 318 319 void set_method_data(MethodData* data) { 320 // The store into method must be released. On platforms without 321 // total store order (TSO) the reference may become visible before 322 // the initialization of data otherwise. 323 OrderAccess::release_store_ptr((volatile void *)&_method_data, data); 324 } 325 326 MethodCounters* method_counters() const { 327 return _method_counters; 328 } 329 330 void set_method_counters(MethodCounters* counters) { 331 // The store into method must be released. On platforms without 332 // total store order (TSO) the reference may become visible before 333 // the initialization of data otherwise. 334 OrderAccess::release_store_ptr((volatile void *)&_method_counters, counters); 335 } 336 337#ifdef TIERED 338 // We are reusing interpreter_invocation_count as a holder for the previous event count! 339 // We can do that since interpreter_invocation_count is not used in tiered. 340 int prev_event_count() const { 341 if (method_counters() == NULL) { 342 return 0; 343 } else { 344 return method_counters()->interpreter_invocation_count(); 345 } 346 } 347 void set_prev_event_count(int count, TRAPS) { 348 MethodCounters* mcs = get_method_counters(CHECK); 349 if (mcs != NULL) { 350 mcs->set_interpreter_invocation_count(count); 351 } 352 } 353 jlong prev_time() const { 354 return method_counters() == NULL ? 0 : method_counters()->prev_time(); 355 } 356 void set_prev_time(jlong time, TRAPS) { 357 MethodCounters* mcs = get_method_counters(CHECK); 358 if (mcs != NULL) { 359 mcs->set_prev_time(time); 360 } 361 } 362 float rate() const { 363 return method_counters() == NULL ? 0 : method_counters()->rate(); 364 } 365 void set_rate(float rate, TRAPS) { 366 MethodCounters* mcs = get_method_counters(CHECK); 367 if (mcs != NULL) { 368 mcs->set_rate(rate); 369 } 370 } 371#endif 372 373 int invocation_count(); 374 int backedge_count(); 375 376 bool was_executed_more_than(int n); 377 bool was_never_executed() { return !was_executed_more_than(0); } 378 379 static void build_interpreter_method_data(methodHandle method, TRAPS); 380 381 static MethodCounters* build_method_counters(Method* m, TRAPS); 382 383 int interpreter_invocation_count() { 384 if (TieredCompilation) return invocation_count(); 385 else return (method_counters() == NULL) ? 0 : 386 method_counters()->interpreter_invocation_count(); 387 } 388 int increment_interpreter_invocation_count(TRAPS) { 389 if (TieredCompilation) ShouldNotReachHere(); 390 MethodCounters* mcs = get_method_counters(CHECK_0); 391 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count(); 392 } 393 394#ifndef PRODUCT 395 int compiled_invocation_count() const { return _compiled_invocation_count; } 396 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 397#else 398 // for PrintMethodData in a product build 399 int compiled_invocation_count() const { return 0; } 400#endif // not PRODUCT 401 402 // Clear (non-shared space) pointers which could not be relevant 403 // if this (shared) method were mapped into another JVM. 404 void remove_unshareable_info(); 405 406 // nmethod/verified compiler entry 407 address verified_code_entry(); 408 bool check_code() const; // Not inline to avoid circular ref 409 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 410 void clear_code(); // Clear out any compiled code 411 static void set_code(methodHandle mh, nmethod* code); 412 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 413 address get_i2c_entry(); 414 address get_c2i_entry(); 415 address get_c2i_unverified_entry(); 416 AdapterHandlerEntry* adapter() { return _adapter; } 417 // setup entry points 418 void link_method(methodHandle method, TRAPS); 419 // clear entry points. Used by sharing code 420 void unlink_method(); 421 422 // vtable index 423 enum VtableIndexFlag { 424 // Valid vtable indexes are non-negative (>= 0). 425 // These few negative values are used as sentinels. 426 itable_index_max = -10, // first itable index, growing downward 427 pending_itable_index = -9, // itable index will be assigned 428 invalid_vtable_index = -4, // distinct from any valid vtable index 429 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 430 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 431 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 432 }; 433 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 434 bool has_vtable_index() const { return _vtable_index >= 0; } 435 int vtable_index() const { return _vtable_index; } 436 void set_vtable_index(int index) { _vtable_index = index; } 437 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; }) 438 bool has_itable_index() const { return _vtable_index <= itable_index_max; } 439 int itable_index() const { assert(valid_itable_index(), ""); 440 return itable_index_max - _vtable_index; } 441 void set_itable_index(int index) { _vtable_index = itable_index_max - index; assert(valid_itable_index(), ""); } 442 443 // interpreter entry 444 address interpreter_entry() const { return _i2i_entry; } 445 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 446 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 447 448 // native function (used for native methods only) 449 enum { 450 native_bind_event_is_interesting = true 451 }; 452 address native_function() const { return *(native_function_addr()); } 453 address critical_native_function(); 454 455 // Must specify a real function (not NULL). 456 // Use clear_native_function() to unregister. 457 void set_native_function(address function, bool post_event_flag); 458 bool has_native_function() const; 459 void clear_native_function(); 460 461 // signature handler (used for native methods only) 462 address signature_handler() const { return *(signature_handler_addr()); } 463 void set_signature_handler(address handler); 464 465 // Interpreter oopmap support 466 void mask_for(int bci, InterpreterOopMap* mask); 467 468 // operations on invocation counter 469 void print_invocation_count(); 470 471 // byte codes 472 void set_code(address code) { return constMethod()->set_code(code); } 473 address code_base() const { return constMethod()->code_base(); } 474 bool contains(address bcp) const { return constMethod()->contains(bcp); } 475 476 // prints byte codes 477 void print_codes() const { print_codes_on(tty); } 478 void print_codes_on(outputStream* st) const; 479 void print_codes_on(int from, int to, outputStream* st) const; 480 481 // method parameters 482 bool has_method_parameters() const 483 { return constMethod()->has_method_parameters(); } 484 int method_parameters_length() const 485 { return constMethod()->method_parameters_length(); } 486 MethodParametersElement* method_parameters_start() const 487 { return constMethod()->method_parameters_start(); } 488 489 // checked exceptions 490 int checked_exceptions_length() const 491 { return constMethod()->checked_exceptions_length(); } 492 CheckedExceptionElement* checked_exceptions_start() const 493 { return constMethod()->checked_exceptions_start(); } 494 495 // localvariable table 496 bool has_localvariable_table() const 497 { return constMethod()->has_localvariable_table(); } 498 int localvariable_table_length() const 499 { return constMethod()->localvariable_table_length(); } 500 LocalVariableTableElement* localvariable_table_start() const 501 { return constMethod()->localvariable_table_start(); } 502 503 bool has_linenumber_table() const 504 { return constMethod()->has_linenumber_table(); } 505 u_char* compressed_linenumber_table() const 506 { return constMethod()->compressed_linenumber_table(); } 507 508 // method holder (the Klass* holding this method) 509 InstanceKlass* method_holder() const { return constants()->pool_holder(); } 510 511 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 512 Symbol* klass_name() const; // returns the name of the method holder 513 BasicType result_type() const; // type of the method result 514 int result_type_index() const; // type index of the method result 515 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 516 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 517 518 // Checked exceptions thrown by this method (resolved to mirrors) 519 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 520 521 // Access flags 522 bool is_public() const { return access_flags().is_public(); } 523 bool is_private() const { return access_flags().is_private(); } 524 bool is_protected() const { return access_flags().is_protected(); } 525 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 526 bool is_static() const { return access_flags().is_static(); } 527 bool is_final() const { return access_flags().is_final(); } 528 bool is_synchronized() const { return access_flags().is_synchronized();} 529 bool is_native() const { return access_flags().is_native(); } 530 bool is_abstract() const { return access_flags().is_abstract(); } 531 bool is_strict() const { return access_flags().is_strict(); } 532 bool is_synthetic() const { return access_flags().is_synthetic(); } 533 534 // returns true if contains only return operation 535 bool is_empty_method() const; 536 537 // returns true if this is a vanilla constructor 538 bool is_vanilla_constructor() const; 539 540 // checks method and its method holder 541 bool is_final_method() const; 542 bool is_final_method(AccessFlags class_access_flags) const; 543 bool is_default_method() const; 544 545 // true if method needs no dynamic dispatch (final and/or no vtable entry) 546 bool can_be_statically_bound() const; 547 bool can_be_statically_bound(AccessFlags class_access_flags) const; 548 549 // returns true if the method has any backward branches. 550 bool has_loops() { 551 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 552 }; 553 554 bool compute_has_loops_flag(); 555 556 bool has_jsrs() { 557 return access_flags().has_jsrs(); 558 }; 559 void set_has_jsrs() { 560 _access_flags.set_has_jsrs(); 561 } 562 563 // returns true if the method has any monitors. 564 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 565 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 566 567 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 568 569 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 570 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 571 // has not been computed yet. 572 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 573 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 574 575 // returns true if the method is an accessor function (setter/getter). 576 bool is_accessor() const; 577 578 // returns true if the method is an initializer (<init> or <clinit>). 579 bool is_initializer() const; 580 581 // returns true if the method is static OR if the classfile version < 51 582 bool has_valid_initializer_flags() const; 583 584 // returns true if the method name is <clinit> and the method has 585 // valid static initializer flags. 586 bool is_static_initializer() const; 587 588 // compiled code support 589 // NOTE: code() is inherently racy as deopt can be clearing code 590 // simultaneously. Use with caution. 591 bool has_compiled_code() const { return code() != NULL; } 592 593 // sizing 594 static int header_size() { return sizeof(Method)/HeapWordSize; } 595 static int size(bool is_native); 596 int size() const { return method_size(); } 597#if INCLUDE_SERVICES 598 void collect_statistics(KlassSizeStats *sz) const; 599#endif 600 601 // interpreter support 602 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } 603 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } 604#ifdef CC_INTERP 605 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); } 606#endif /* CC_INTERP */ 607 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); } 608 static ByteSize code_offset() { return byte_offset_of(Method, _code); } 609 static ByteSize method_data_offset() { 610 return byte_offset_of(Method, _method_data); 611 } 612 static ByteSize method_counters_offset() { 613 return byte_offset_of(Method, _method_counters); 614 } 615#ifndef PRODUCT 616 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); } 617#endif // not PRODUCT 618 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); } 619 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); } 620 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); } 621 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); } 622 623 // for code generation 624 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } 625 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } 626 static int intrinsic_id_size_in_bytes() { return sizeof(u1); } 627 628 // Static methods that are used to implement member methods where an exposed this pointer 629 // is needed due to possible GCs 630 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS); 631 632 // Returns the byte code index from the byte code pointer 633 int bci_from(address bcp) const; 634 address bcp_from(int bci) const; 635 int validate_bci_from_bcx(intptr_t bcx) const; 636 637 // Returns the line number for a bci if debugging information for the method is prowided, 638 // -1 is returned otherwise. 639 int line_number_from_bci(int bci) const; 640 641 // Reflection support 642 bool is_overridden_in(Klass* k) const; 643 644 // Stack walking support 645 bool is_ignored_by_security_stack_walk() const; 646 647 // JSR 292 support 648 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) 649 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm 650 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. 651 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual 652 Symbol* signature, //anything at all 653 TRAPS); 654 static Klass* check_non_bcp_klass(Klass* klass); 655 656 // How many extra stack entries for invokedynamic when it's enabled 657 static const int extra_stack_entries_for_jsr292 = 1; 658 659 // this operates only on invoke methods: 660 // presize interpreter frames for extra interpreter stack entries, if needed 661 // Account for the extra appendix argument for invokehandle/invokedynamic 662 static int extra_stack_entries() { return EnableInvokeDynamic ? extra_stack_entries_for_jsr292 : 0; } 663 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize 664 665 // RedefineClasses() support: 666 bool is_old() const { return access_flags().is_old(); } 667 void set_is_old() { _access_flags.set_is_old(); } 668 bool is_obsolete() const { return access_flags().is_obsolete(); } 669 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 670 bool on_stack() const { return access_flags().on_stack(); } 671 void set_on_stack(const bool value); 672 673 // see the definition in Method*.cpp for the gory details 674 bool should_not_be_cached() const; 675 676 // JVMTI Native method prefixing support: 677 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 678 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 679 680 // Rewriting support 681 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 682 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 683 684 // jmethodID handling 685 // Because the useful life-span of a jmethodID cannot be determined, 686 // once created they are never reclaimed. The methods to which they refer, 687 // however, can be GC'ed away if the class is unloaded or if the method is 688 // made obsolete or deleted -- in these cases, the jmethodID 689 // refers to NULL (as is the case for any weak reference). 690 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh); 691 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid); 692 693 // Use resolve_jmethod_id() in situations where the caller is expected 694 // to provide a valid jmethodID; the only sanity checks are in asserts; 695 // result guaranteed not to be NULL. 696 inline static Method* resolve_jmethod_id(jmethodID mid) { 697 assert(mid != NULL, "JNI method id should not be null"); 698 return *((Method**)mid); 699 } 700 701 // Use checked_resolve_jmethod_id() in situations where the caller 702 // should provide a valid jmethodID, but might not. NULL is returned 703 // when the jmethodID does not refer to a valid method. 704 static Method* checked_resolve_jmethod_id(jmethodID mid); 705 706 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method); 707 static bool is_method_id(jmethodID mid); 708 709 // Clear methods 710 static void clear_jmethod_ids(ClassLoaderData* loader_data); 711 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN; 712 713 // Get this method's jmethodID -- allocate if it doesn't exist 714 jmethodID jmethod_id() { methodHandle this_h(this); 715 return InstanceKlass::get_jmethod_id(method_holder(), this_h); } 716 717 // Lookup the jmethodID for this method. Return NULL if not found. 718 // NOTE that this function can be called from a signal handler 719 // (see AsyncGetCallTrace support for Forte Analyzer) and this 720 // needs to be async-safe. No allocation should be done and 721 // so handles are not used to avoid deadlock. 722 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); } 723 724 // Support for inlining of intrinsic methods 725 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 726 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 727 728 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 729 void init_intrinsic_id(); // updates from _none if a match 730 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder); 731 732 bool jfr_towrite() { 733 return (_flags & _jfr_towrite) != 0; 734 } 735 void set_jfr_towrite(bool x) { 736 _flags = x ? (_flags | _jfr_towrite) : (_flags & ~_jfr_towrite); 737 } 738 739 bool caller_sensitive() { 740 return (_flags & _caller_sensitive) != 0; 741 } 742 void set_caller_sensitive(bool x) { 743 _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive); 744 } 745 746 bool force_inline() { 747 return (_flags & _force_inline) != 0; 748 } 749 void set_force_inline(bool x) { 750 _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline); 751 } 752 753 bool dont_inline() { 754 return (_flags & _dont_inline) != 0; 755 } 756 void set_dont_inline(bool x) { 757 _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline); 758 } 759 760 bool is_hidden() { 761 return (_flags & _hidden) != 0; 762 } 763 void set_hidden(bool x) { 764 _flags = x ? (_flags | _hidden) : (_flags & ~_hidden); 765 } 766 767 ConstMethod::MethodType method_type() const { 768 return _constMethod->method_type(); 769 } 770 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; } 771 772 // On-stack replacement support 773 bool has_osr_nmethod(int level, bool match_level) { 774 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 775 } 776 777 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 778 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level); 779 } 780 781 // Inline cache support 782 void cleanup_inline_caches(); 783 784 // Find if klass for method is loaded 785 bool is_klass_loaded_by_klass_index(int klass_index) const; 786 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 787 788 // Indicates whether compilation failed earlier for this method, or 789 // whether it is not compilable for another reason like having a 790 // breakpoint set in it. 791 bool is_not_compilable(int comp_level = CompLevel_any) const; 792 void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); 793 void set_not_compilable_quietly(int comp_level = CompLevel_all) { 794 set_not_compilable(comp_level, false); 795 } 796 bool is_not_osr_compilable(int comp_level = CompLevel_any) const; 797 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); 798 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) { 799 set_not_osr_compilable(comp_level, false); 800 } 801 bool is_always_compilable() const; 802 803 private: 804 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason); 805 806 public: 807 MethodCounters* get_method_counters(TRAPS) { 808 if (_method_counters == NULL) { 809 build_method_counters(this, CHECK_AND_CLEAR_NULL); 810 } 811 return _method_counters; 812 } 813 814 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, bool set_idnums = true); 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 878class 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 928class 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 953class 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 988class 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 1050