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/instanceKlass.hpp" 35 #include "oops/oop.hpp" 36 #include "oops/typeArrayOop.hpp" 37 #include "utilities/accessFlags.hpp" 38 #include "utilities/growableArray.hpp" 39 40 // A Method* represents a Java method. 41 // 42 // Memory layout (each line represents a word). Note that most applications load thousands of methods, 43 // so keeping the size of this structure small has a big impact on footprint. 44 // 45 // We put all oops and method_size first for better gc cache locality. 46 // 47 // The actual bytecodes are inlined after the end of the Method struct. 48 // 49 // There are bits in the access_flags telling whether inlined tables are present. 50 // Note that accessing the line number and local variable tables is not performance critical at all. 51 // Accessing the checked exceptions table is used by reflection, so we put that last to make access 52 // to it fast. 53 // 54 // The line number table is compressed and inlined following the byte codes. It is found as the first 55 // byte following the byte codes. The checked exceptions table and the local variable table are inlined 56 // after the line number table, and indexed from the end of the method. We do not compress the checked 57 // exceptions table since the average length is less than 2, and do not bother to compress the local 58 // variable table either since it is mostly absent. 59 // 60 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter) 61 // 62 // |------------------------------------------------------| 63 // | header | 64 // | klass | 65 // |------------------------------------------------------| 66 // | ConstMethod* (oop) | 67 // |------------------------------------------------------| 68 // | methodData (oop) | 69 // | interp_invocation_count | 70 // |------------------------------------------------------| 71 // | access_flags | 72 // | vtable_index | 73 // |------------------------------------------------------| 74 // | result_index (C++ interpreter only) | 75 // |------------------------------------------------------| 76 // | method_size | intrinsic_id| flags | 77 // |------------------------------------------------------| 78 // | throwout_count | num_breakpoints | 79 // |------------------------------------------------------| 80 // | invocation_counter | 81 // | backedge_counter | 82 // |------------------------------------------------------| 83 // | prev_time (tiered only, 64 bit wide) | 84 // | | 85 // |------------------------------------------------------| 86 // | rate (tiered) | 87 // |------------------------------------------------------| 88 // | code (pointer) | 89 // | i2i (pointer) | 90 // | adapter (pointer) | 91 // | from_compiled_entry (pointer) | 92 // | from_interpreted_entry (pointer) | 93 // |------------------------------------------------------| 94 // | native_function (present only if native) | 95 // | signature_handler (present only if native) | 96 // |------------------------------------------------------| 97 98 99 class CheckedExceptionElement; 100 class LocalVariableTableElement; 101 class AdapterHandlerEntry; 102 class MethodData; 103 class ConstMethod; 104 class InlineTableSizes; 105 class KlassSizeStats; 106 107 class Method : public Metadata { 108 friend class VMStructs; 109 private: 110 ConstMethod* _constMethod; // Method read-only data. 111 MethodData* _method_data; 112 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 113 AccessFlags _access_flags; // Access flags 114 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 115 // note: can have vtables with >2**16 elements (because of inheritance) 116 #ifdef CC_INTERP 117 int _result_index; // C++ interpreter needs for converting results to/from stack 118 #endif 119 u2 _method_size; // size of this object 120 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 121 u1 _jfr_towrite : 1, // Flags 122 _force_inline : 1, 123 _hidden : 1, 124 _dont_inline : 1, 125 : 4; 126 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 127 u2 _number_of_breakpoints; // fullspeed debugging support 128 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 129 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 130 131 #ifdef TIERED 132 float _rate; // Events (invocation and backedge counter increments) per millisecond 133 jlong _prev_time; // Previous time the rate was acquired 134 #endif 135 136 #ifndef PRODUCT 137 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 138 #endif 139 // Entry point for calling both from and to the interpreter. 140 address _i2i_entry; // All-args-on-stack calling convention 141 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked. 142 AdapterHandlerEntry* _adapter; 143 // Entry point for calling from compiled code, to compiled code if it exists 144 // or else the interpreter. 145 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 146 // The entry point for calling both from and to compiled code is 147 // "_code->entry_point()". Because of tiered compilation and de-opt, this 148 // field can come and go. It can transition from NULL to not-null at any 149 // time (whenever a compile completes). It can transition from not-null to 150 // NULL only at safepoints (because of a de-opt). 151 nmethod* volatile _code; // Points to the corresponding piece of native code 152 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 153 154 // Constructor 155 Method(ConstMethod* xconst, AccessFlags access_flags, int size); 156 public: 157 158 static Method* allocate(ClassLoaderData* loader_data, 159 int byte_code_size, 160 AccessFlags access_flags, 161 InlineTableSizes* sizes, 162 ConstMethod::MethodType method_type, 163 TRAPS); 164 165 // CDS and vtbl checking can create an empty Method to get vtbl pointer. 166 Method(){} 167 168 // The Method vtable is restored by this call when the Method is in the 169 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for 170 // all the gory details. SA, dtrace and pstack helpers distinguish metadata 171 // by their vtable. 172 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); } 173 bool is_method() const volatile { return true; } 174 175 // accessors for instance variables 176 177 ConstMethod* constMethod() const { return _constMethod; } 178 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; } 179 180 181 static address make_adapters(methodHandle mh, TRAPS); 182 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 183 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 184 185 // access flag 186 AccessFlags access_flags() const { return _access_flags; } 187 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 188 189 // name 190 Symbol* name() const { return constants()->symbol_at(name_index()); } 191 int name_index() const { return constMethod()->name_index(); } 192 void set_name_index(int index) { constMethod()->set_name_index(index); } 193 194 // signature 195 Symbol* signature() const { return constants()->symbol_at(signature_index()); } 196 int signature_index() const { return constMethod()->signature_index(); } 197 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 198 199 // generics support 200 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); } 201 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 202 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 203 204 // annotations support 205 AnnotationArray* annotations() const { 206 return constMethod()->method_annotations(); 207 } 208 AnnotationArray* parameter_annotations() const { 209 return constMethod()->parameter_annotations(); 210 } 211 AnnotationArray* annotation_default() const { 212 return constMethod()->default_annotations(); 213 } 214 AnnotationArray* type_annotations() const { 215 return constMethod()->type_annotations(); 216 } 217 218 #ifdef CC_INTERP 219 void set_result_index(BasicType type); 220 int result_index() { return _result_index; } 221 #endif 222 223 // Helper routine: get klass name + "." + method name + signature as 224 // C string, for the purpose of providing more useful NoSuchMethodErrors 225 // and fatal error handling. The string is allocated in resource 226 // area if a buffer is not provided by the caller. 227 char* name_and_sig_as_C_string() const; 228 char* name_and_sig_as_C_string(char* buf, int size) const; 229 230 // Static routine in the situations we don't have a Method* 231 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); 232 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); 233 234 Bytecodes::Code java_code_at(int bci) const { 235 return Bytecodes::java_code_at(this, bcp_from(bci)); 236 } 237 Bytecodes::Code code_at(int bci) const { 238 return Bytecodes::code_at(this, bcp_from(bci)); 239 } 240 241 // JVMTI breakpoints 242 Bytecodes::Code orig_bytecode_at(int bci) const; 243 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 244 void set_breakpoint(int bci); 245 void clear_breakpoint(int bci); 246 void clear_all_breakpoints(); 247 // Tracking number of breakpoints, for fullspeed debugging. 248 // Only mutated by VM thread. 249 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 250 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 251 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 252 // Initialization only 253 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 254 255 // index into InstanceKlass methods() array 256 // note: also used by jfr 257 u2 method_idnum() const { return constMethod()->method_idnum(); } 258 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 259 260 // code size 261 int code_size() const { return constMethod()->code_size(); } 262 263 // method size 264 int method_size() const { return _method_size; } 265 void set_method_size(int size) { 266 assert(0 <= size && size < (1 << 16), "invalid method size"); 267 _method_size = size; 268 } 269 270 // constant pool for Klass* holding this method 271 ConstantPool* constants() const { return constMethod()->constants(); } 272 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); } 273 274 // max stack 275 // return original max stack size for method verification 276 int verifier_max_stack() const { return constMethod()->max_stack(); } 277 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); } 278 void set_max_stack(int size) { constMethod()->set_max_stack(size); } 279 280 // max locals 281 int max_locals() const { return constMethod()->max_locals(); } 282 void set_max_locals(int size) { constMethod()->set_max_locals(size); } 283 284 int highest_comp_level() const; 285 void set_highest_comp_level(int level); 286 int highest_osr_comp_level() const; 287 void set_highest_osr_comp_level(int level); 288 289 // Count of times method was exited via exception while interpreting 290 void interpreter_throwout_increment() { 291 if (_interpreter_throwout_count < 65534) { 292 _interpreter_throwout_count++; 293 } 294 } 295 296 int interpreter_throwout_count() const { return _interpreter_throwout_count; } 297 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } 298 299 // size of parameters 300 int size_of_parameters() const { return constMethod()->size_of_parameters(); } 301 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); } 302 303 bool has_stackmap_table() const { 304 return constMethod()->has_stackmap_table(); 305 } 306 307 Array<u1>* stackmap_data() const { 308 return constMethod()->stackmap_data(); 309 } 310 311 void set_stackmap_data(Array<u1>* sd) { 312 constMethod()->set_stackmap_data(sd); 313 } 314 315 // exception handler table 316 bool has_exception_handler() const 317 { return constMethod()->has_exception_handler(); } 318 int exception_table_length() const 319 { return constMethod()->exception_table_length(); } 320 ExceptionTableElement* exception_table_start() const 321 { return constMethod()->exception_table_start(); } 322 323 // Finds the first entry point bci of an exception handler for an 324 // exception of klass ex_klass thrown at throw_bci. A value of NULL 325 // for ex_klass indicates that the exception klass is not known; in 326 // this case it matches any constraint class. Returns -1 if the 327 // exception cannot be handled in this method. The handler 328 // constraint classes are loaded if necessary. Note that this may 329 // throw an exception if loading of the constraint classes causes 330 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 331 // If an exception is thrown, returns the bci of the 332 // exception handler which caused the exception to be thrown, which 333 // is needed for proper retries. See, for example, 334 // InterpreterRuntime::exception_handler_for_exception. 335 static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS); 336 337 // method data access 338 MethodData* method_data() const { 339 return _method_data; 340 } 341 void set_method_data(MethodData* data) { 342 _method_data = data; 343 } 344 345 // invocation counter 346 InvocationCounter* invocation_counter() { return &_invocation_counter; } 347 InvocationCounter* backedge_counter() { return &_backedge_counter; } 348 349 #ifdef TIERED 350 // We are reusing interpreter_invocation_count as a holder for the previous event count! 351 // We can do that since interpreter_invocation_count is not used in tiered. 352 int prev_event_count() const { return _interpreter_invocation_count; } 353 void set_prev_event_count(int count) { _interpreter_invocation_count = count; } 354 jlong prev_time() const { return _prev_time; } 355 void set_prev_time(jlong time) { _prev_time = time; } 356 float rate() const { return _rate; } 357 void set_rate(float rate) { _rate = rate; } 358 #endif 359 360 int invocation_count(); 361 int backedge_count(); 362 363 bool was_executed_more_than(int n); 364 bool was_never_executed() { return !was_executed_more_than(0); } 365 366 static void build_interpreter_method_data(methodHandle method, TRAPS); 367 368 int interpreter_invocation_count() { 369 if (TieredCompilation) return invocation_count(); 370 else return _interpreter_invocation_count; 371 } 372 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } 373 int increment_interpreter_invocation_count() { 374 if (TieredCompilation) ShouldNotReachHere(); 375 return ++_interpreter_invocation_count; 376 } 377 378 #ifndef PRODUCT 379 int compiled_invocation_count() const { return _compiled_invocation_count; } 380 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 381 #endif // not PRODUCT 382 383 // Clear (non-shared space) pointers which could not be relevant 384 // if this (shared) method were mapped into another JVM. 385 void remove_unshareable_info(); 386 387 // nmethod/verified compiler entry 388 address verified_code_entry(); 389 bool check_code() const; // Not inline to avoid circular ref 390 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 391 void clear_code(); // Clear out any compiled code 392 static void set_code(methodHandle mh, nmethod* code); 393 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 394 address get_i2c_entry(); 395 address get_c2i_entry(); 396 address get_c2i_unverified_entry(); 397 AdapterHandlerEntry* adapter() { return _adapter; } 398 // setup entry points 399 void link_method(methodHandle method, TRAPS); 400 // clear entry points. Used by sharing code 401 void unlink_method(); 402 403 // vtable index 404 enum VtableIndexFlag { 405 // Valid vtable indexes are non-negative (>= 0). 406 // These few negative values are used as sentinels. 407 highest_unused_vtable_index_value = -5, 408 invalid_vtable_index = -4, // distinct from any valid vtable index 409 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 410 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 411 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 412 }; 413 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 414 int vtable_index() const { assert(valid_vtable_index(), ""); 415 return _vtable_index; } 416 void set_vtable_index(int index) { _vtable_index = index; } 417 418 // interpreter entry 419 address interpreter_entry() const { return _i2i_entry; } 420 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 421 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 422 423 // native function (used for native methods only) 424 enum { 425 native_bind_event_is_interesting = true 426 }; 427 address native_function() const { return *(native_function_addr()); } 428 address critical_native_function(); 429 430 // Must specify a real function (not NULL). 431 // Use clear_native_function() to unregister. 432 void set_native_function(address function, bool post_event_flag); 433 bool has_native_function() const; 434 void clear_native_function(); 435 436 // signature handler (used for native methods only) 437 address signature_handler() const { return *(signature_handler_addr()); } 438 void set_signature_handler(address handler); 439 440 // Interpreter oopmap support 441 void mask_for(int bci, InterpreterOopMap* mask); 442 443 #ifndef PRODUCT 444 // operations on invocation counter 445 void print_invocation_count(); 446 #endif 447 448 // byte codes 449 void set_code(address code) { return constMethod()->set_code(code); } 450 address code_base() const { return constMethod()->code_base(); } 451 bool contains(address bcp) const { return constMethod()->contains(bcp); } 452 453 // prints byte codes 454 void print_codes() const { print_codes_on(tty); } 455 void print_codes_on(outputStream* st) const PRODUCT_RETURN; 456 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; 457 458 // method parameters 459 bool has_method_parameters() const 460 { return constMethod()->has_method_parameters(); } 461 int method_parameters_length() const 462 { return constMethod()->method_parameters_length(); } 463 MethodParametersElement* method_parameters_start() const 464 { return constMethod()->method_parameters_start(); } 465 466 // checked exceptions 467 int checked_exceptions_length() const 468 { return constMethod()->checked_exceptions_length(); } 469 CheckedExceptionElement* checked_exceptions_start() const 470 { return constMethod()->checked_exceptions_start(); } 471 472 // localvariable table 473 bool has_localvariable_table() const 474 { return constMethod()->has_localvariable_table(); } 475 int localvariable_table_length() const 476 { return constMethod()->localvariable_table_length(); } 477 LocalVariableTableElement* localvariable_table_start() const 478 { return constMethod()->localvariable_table_start(); } 479 480 bool has_linenumber_table() const 481 { return constMethod()->has_linenumber_table(); } 482 u_char* compressed_linenumber_table() const 483 { return constMethod()->compressed_linenumber_table(); } 484 485 // method holder (the Klass* holding this method) 486 InstanceKlass* method_holder() const { return constants()->pool_holder(); } 487 488 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 489 Symbol* klass_name() const; // returns the name of the method holder 490 BasicType result_type() const; // type of the method result 491 int result_type_index() const; // type index of the method result 492 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 493 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 494 495 // Checked exceptions thrown by this method (resolved to mirrors) 496 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 497 498 // Access flags 499 bool is_public() const { return access_flags().is_public(); } 500 bool is_private() const { return access_flags().is_private(); } 501 bool is_protected() const { return access_flags().is_protected(); } 502 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 503 bool is_static() const { return access_flags().is_static(); } 504 bool is_final() const { return access_flags().is_final(); } 505 bool is_synchronized() const { return access_flags().is_synchronized();} 506 bool is_native() const { return access_flags().is_native(); } 507 bool is_abstract() const { return access_flags().is_abstract(); } 508 bool is_strict() const { return access_flags().is_strict(); } 509 bool is_synthetic() const { return access_flags().is_synthetic(); } 510 511 // returns true if contains only return operation 512 bool is_empty_method() const; 513 514 // returns true if this is a vanilla constructor 515 bool is_vanilla_constructor() const; 516 517 // checks method and its method holder 518 bool is_final_method() const; 519 bool is_strict_method() const; 520 521 // true if method needs no dynamic dispatch (final and/or no vtable entry) 522 bool can_be_statically_bound() const; 523 524 // returns true if the method has any backward branches. 525 bool has_loops() { 526 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 527 }; 528 529 bool compute_has_loops_flag(); 530 531 bool has_jsrs() { 532 return access_flags().has_jsrs(); 533 }; 534 void set_has_jsrs() { 535 _access_flags.set_has_jsrs(); 536 } 537 538 // returns true if the method has any monitors. 539 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 540 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 541 542 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 543 544 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 545 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 546 // has not been computed yet. 547 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 548 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 549 550 // returns true if the method is an accessor function (setter/getter). 551 bool is_accessor() const; 552 553 // returns true if the method is an initializer (<init> or <clinit>). 554 bool is_initializer() const; 555 556 // returns true if the method is static OR if the classfile version < 51 557 bool has_valid_initializer_flags() const; 558 559 // returns true if the method name is <clinit> and the method has 560 // valid static initializer flags. 561 bool is_static_initializer() const; 562 563 // compiled code support 564 // NOTE: code() is inherently racy as deopt can be clearing code 565 // simultaneously. Use with caution. 566 bool has_compiled_code() const { return code() != NULL; } 567 568 // sizing 569 static int header_size() { return sizeof(Method)/HeapWordSize; } 570 static int size(bool is_native); 571 int size() const { return method_size(); } 572 #if INCLUDE_SERVICES 573 void collect_statistics(KlassSizeStats *sz) const; 574 #endif 575 576 // interpreter support 577 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } 578 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } 579 #ifdef CC_INTERP 580 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); } 581 #endif /* CC_INTERP */ 582 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); } 583 static ByteSize code_offset() { return byte_offset_of(Method, _code); } 584 static ByteSize invocation_counter_offset() { return byte_offset_of(Method, _invocation_counter); } 585 static ByteSize backedge_counter_offset() { return byte_offset_of(Method, _backedge_counter); } 586 static ByteSize method_data_offset() { 587 return byte_offset_of(Method, _method_data); 588 } 589 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(Method, _interpreter_invocation_count); } 590 #ifndef PRODUCT 591 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); } 592 #endif // not PRODUCT 593 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); } 594 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); } 595 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); } 596 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); } 597 598 // for code generation 599 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } 600 static int interpreter_invocation_counter_offset_in_bytes() 601 { return offset_of(Method, _interpreter_invocation_count); } 602 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } 603 static int intrinsic_id_size_in_bytes() { return sizeof(u1); } 604 605 // Static methods that are used to implement member methods where an exposed this pointer 606 // is needed due to possible GCs 607 static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS); 608 609 // Returns the byte code index from the byte code pointer 610 int bci_from(address bcp) const; 611 address bcp_from(int bci) const; 612 int validate_bci_from_bcx(intptr_t bcx) const; 613 614 // Returns the line number for a bci if debugging information for the method is prowided, 615 // -1 is returned otherwise. 616 int line_number_from_bci(int bci) const; 617 618 // Reflection support 619 bool is_overridden_in(Klass* k) const; 620 621 // JSR 292 support 622 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) 623 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm 624 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. 625 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual 626 Symbol* signature, //anything at all 627 TRAPS); 628 static Klass* check_non_bcp_klass(Klass* klass); 629 // these operate only on invoke methods: 630 // presize interpreter frames for extra interpreter stack entries, if needed 631 // method handles want to be able to push a few extra values (e.g., a bound receiver), and 632 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, 633 // all without checking for a stack overflow 634 static int extra_stack_entries() { return EnableInvokeDynamic ? 2 : 0; } 635 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize() 636 637 // RedefineClasses() support: 638 bool is_old() const { return access_flags().is_old(); } 639 void set_is_old() { _access_flags.set_is_old(); } 640 bool is_obsolete() const { return access_flags().is_obsolete(); } 641 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 642 bool on_stack() const { return access_flags().on_stack(); } 643 void set_on_stack(const bool value); 644 645 // see the definition in Method*.cpp for the gory details 646 bool should_not_be_cached() const; 647 648 // JVMTI Native method prefixing support: 649 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 650 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 651 652 // Rewriting support 653 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 654 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 655 656 // jmethodID handling 657 // Because the useful life-span of a jmethodID cannot be determined, 658 // once created they are never reclaimed. The methods to which they refer, 659 // however, can be GC'ed away if the class is unloaded or if the method is 660 // made obsolete or deleted -- in these cases, the jmethodID 661 // refers to NULL (as is the case for any weak reference). 662 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh); 663 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid); 664 665 // Use resolve_jmethod_id() in situations where the caller is expected 666 // to provide a valid jmethodID; the only sanity checks are in asserts; 667 // result guaranteed not to be NULL. 668 inline static Method* resolve_jmethod_id(jmethodID mid) { 669 assert(mid != NULL, "JNI method id should not be null"); 670 return *((Method**)mid); 671 } 672 673 // Use checked_resolve_jmethod_id() in situations where the caller 674 // should provide a valid jmethodID, but might not. NULL is returned 675 // when the jmethodID does not refer to a valid method. 676 static Method* checked_resolve_jmethod_id(jmethodID mid); 677 678 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method); 679 static bool is_method_id(jmethodID mid); 680 681 // Clear methods 682 static void clear_jmethod_ids(ClassLoaderData* loader_data); 683 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN; 684 685 // Get this method's jmethodID -- allocate if it doesn't exist 686 jmethodID jmethod_id() { methodHandle this_h(this); 687 return InstanceKlass::get_jmethod_id(method_holder(), this_h); } 688 689 // Lookup the jmethodID for this method. Return NULL if not found. 690 // NOTE that this function can be called from a signal handler 691 // (see AsyncGetCallTrace support for Forte Analyzer) and this 692 // needs to be async-safe. No allocation should be done and 693 // so handles are not used to avoid deadlock. 694 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); } 695 696 // JNI static invoke cached itable index accessors 697 int cached_itable_index() { return method_holder()->cached_itable_index(method_idnum()); } 698 void set_cached_itable_index(int index) { method_holder()->set_cached_itable_index(method_idnum(), index); } 699 700 // Support for inlining of intrinsic methods 701 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 702 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 703 704 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 705 void init_intrinsic_id(); // updates from _none if a match 706 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder); 707 708 bool jfr_towrite() { return _jfr_towrite; } 709 void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; } 710 711 bool force_inline() { return _force_inline; } 712 void set_force_inline(bool x) { _force_inline = x; } 713 bool dont_inline() { return _dont_inline; } 714 void set_dont_inline(bool x) { _dont_inline = x; } 715 bool is_hidden() { return _hidden; } 716 void set_hidden(bool x) { _hidden = x; } 717 ConstMethod::MethodType method_type() const { 718 return _constMethod->method_type(); 719 } 720 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; } 721 722 // On-stack replacement support 723 bool has_osr_nmethod(int level, bool match_level) { 724 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 725 } 726 727 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 728 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level); 729 } 730 731 // Inline cache support 732 void cleanup_inline_caches(); 733 734 // Find if klass for method is loaded 735 bool is_klass_loaded_by_klass_index(int klass_index) const; 736 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 737 738 // Indicates whether compilation failed earlier for this method, or 739 // whether it is not compilable for another reason like having a 740 // breakpoint set in it. 741 bool is_not_compilable(int comp_level = CompLevel_any) const; 742 void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); 743 void set_not_compilable_quietly(int comp_level = CompLevel_all) { 744 set_not_compilable(comp_level, false); 745 } 746 bool is_not_osr_compilable(int comp_level = CompLevel_any) const; 747 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); 748 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) { 749 set_not_osr_compilable(comp_level, false); 750 } 751 752 private: 753 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason); 754 755 public: 756 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 757 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 758 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 759 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 760 761 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit 762 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit 763 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); } 764 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); } 765 766 // Background compilation support 767 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 768 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 769 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 770 771 // Resolve all classes in signature, return 'true' if successful 772 static bool load_signature_classes(methodHandle m, TRAPS); 773 774 // Return if true if not all classes references in signature, including return type, has been loaded 775 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 776 777 // Printing 778 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM 779 #if INCLUDE_JVMTI 780 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses 781 #else 782 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" 783 #endif 784 785 // Helper routine used for method sorting 786 static void sort_methods(Array<Method*>* methods, bool idempotent = false); 787 788 // Deallocation function for redefine classes or if an error occurs 789 void deallocate_contents(ClassLoaderData* loader_data); 790 791 // Printing 792 #ifndef PRODUCT 793 void print_on(outputStream* st) const; 794 #endif 795 void print_value_on(outputStream* st) const; 796 797 const char* internal_name() const { return "{method}"; } 798 799 // Check for valid method pointer 800 bool is_valid_method() const; 801 802 // Verify 803 void verify() { verify_on(tty); } 804 void verify_on(outputStream* st); 805 806 private: 807 808 // Inlined elements 809 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 810 address* signature_handler_addr() const { return native_function_addr() + 1; } 811 }; 812 813 814 // Utility class for compressing line number tables 815 816 class CompressedLineNumberWriteStream: public CompressedWriteStream { 817 private: 818 int _bci; 819 int _line; 820 public: 821 // Constructor 822 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 823 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 824 825 // Write (bci, line number) pair to stream 826 void write_pair_regular(int bci_delta, int line_delta); 827 828 inline void write_pair_inline(int bci, int line) { 829 int bci_delta = bci - _bci; 830 int line_delta = line - _line; 831 _bci = bci; 832 _line = line; 833 // Skip (0,0) deltas - they do not add information and conflict with terminator. 834 if (bci_delta == 0 && line_delta == 0) return; 835 // Check if bci is 5-bit and line number 3-bit unsigned. 836 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 837 // Compress into single byte. 838 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 839 // Check that value doesn't match escape character. 840 if (value != 0xFF) { 841 write_byte(value); 842 return; 843 } 844 } 845 write_pair_regular(bci_delta, line_delta); 846 } 847 848 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 849 // Disabling optimization doesn't work for methods in header files 850 // so we force it to call through the non-optimized version in the .cpp. 851 // It's gross, but it's the only way we can ensure that all callers are 852 // fixed. _MSC_VER is defined by the windows compiler 853 #if defined(_M_AMD64) && _MSC_VER >= 1400 854 void write_pair(int bci, int line); 855 #else 856 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 857 #endif 858 859 // Write end-of-stream marker 860 void write_terminator() { write_byte(0); } 861 }; 862 863 864 // Utility class for decompressing line number tables 865 866 class CompressedLineNumberReadStream: public CompressedReadStream { 867 private: 868 int _bci; 869 int _line; 870 public: 871 // Constructor 872 CompressedLineNumberReadStream(u_char* buffer); 873 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 874 bool read_pair(); 875 // Accessing bci and line number (after calling read_pair) 876 int bci() const { return _bci; } 877 int line() const { return _line; } 878 }; 879 880 881 /// Fast Breakpoints. 882 883 // If this structure gets more complicated (because bpts get numerous), 884 // move it into its own header. 885 886 // There is presently no provision for concurrent access 887 // to breakpoint lists, which is only OK for JVMTI because 888 // breakpoints are written only at safepoints, and are read 889 // concurrently only outside of safepoints. 890 891 class BreakpointInfo : public CHeapObj<mtClass> { 892 friend class VMStructs; 893 private: 894 Bytecodes::Code _orig_bytecode; 895 int _bci; 896 u2 _name_index; // of method 897 u2 _signature_index; // of method 898 BreakpointInfo* _next; // simple storage allocation 899 900 public: 901 BreakpointInfo(Method* m, int bci); 902 903 // accessors 904 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 905 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 906 int bci() { return _bci; } 907 908 BreakpointInfo* next() const { return _next; } 909 void set_next(BreakpointInfo* n) { _next = n; } 910 911 // helps for searchers 912 bool match(const Method* m, int bci) { 913 return bci == _bci && match(m); 914 } 915 916 bool match(const Method* m) { 917 return _name_index == m->name_index() && 918 _signature_index == m->signature_index(); 919 } 920 921 void set(Method* method); 922 void clear(Method* method); 923 }; 924 925 // Utility class for access exception handlers 926 class ExceptionTable : public StackObj { 927 private: 928 ExceptionTableElement* _table; 929 u2 _length; 930 931 public: 932 ExceptionTable(Method* m) { 933 if (m->has_exception_handler()) { 934 _table = m->exception_table_start(); 935 _length = m->exception_table_length(); 936 } else { 937 _table = NULL; 938 _length = 0; 939 } 940 } 941 942 int length() const { 943 return _length; 944 } 945 946 u2 start_pc(int idx) const { 947 assert(idx < _length, "out of bounds"); 948 return _table[idx].start_pc; 949 } 950 951 void set_start_pc(int idx, u2 value) { 952 assert(idx < _length, "out of bounds"); 953 _table[idx].start_pc = value; 954 } 955 956 u2 end_pc(int idx) const { 957 assert(idx < _length, "out of bounds"); 958 return _table[idx].end_pc; 959 } 960 961 void set_end_pc(int idx, u2 value) { 962 assert(idx < _length, "out of bounds"); 963 _table[idx].end_pc = value; 964 } 965 966 u2 handler_pc(int idx) const { 967 assert(idx < _length, "out of bounds"); 968 return _table[idx].handler_pc; 969 } 970 971 void set_handler_pc(int idx, u2 value) { 972 assert(idx < _length, "out of bounds"); 973 _table[idx].handler_pc = value; 974 } 975 976 u2 catch_type_index(int idx) const { 977 assert(idx < _length, "out of bounds"); 978 return _table[idx].catch_type_index; 979 } 980 981 void set_catch_type_index(int idx, u2 value) { 982 assert(idx < _length, "out of bounds"); 983 _table[idx].catch_type_index = value; 984 } 985 }; 986 987 #endif // SHARE_VM_OOPS_METHODOOP_HPP