1 /* 2 * Copyright (c) 1997, 2012, 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/constMethodOop.hpp" 33 #include "oops/constantPoolOop.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 methodOop 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 methodOopDesc 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 // | constMethodOop (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 | max_stack | 77 // | max_locals | size_of_parameters | 78 // |------------------------------------------------------| 79 // |intrinsic_id| flags | throwout_count | 80 // |------------------------------------------------------| 81 // | num_breakpoints | (unused) | 82 // |------------------------------------------------------| 83 // | invocation_counter | 84 // | backedge_counter | 85 // |------------------------------------------------------| 86 // | prev_time (tiered only, 64 bit wide) | 87 // | | 88 // |------------------------------------------------------| 89 // | rate (tiered) | 90 // |------------------------------------------------------| 91 // | code (pointer) | 92 // | i2i (pointer) | 93 // | adapter (pointer) | 94 // | from_compiled_entry (pointer) | 95 // | from_interpreted_entry (pointer) | 96 // |------------------------------------------------------| 97 // | native_function (present only if native) | 98 // | signature_handler (present only if native) | 99 // |------------------------------------------------------| 100 101 102 class CheckedExceptionElement; 103 class LocalVariableTableElement; 104 class AdapterHandlerEntry; 105 class methodDataOopDesc; 106 107 class methodOopDesc : public oopDesc { 108 friend class methodKlass; 109 friend class VMStructs; 110 private: 111 constMethodOop _constMethod; // Method read-only data. 112 methodDataOop _method_data; 113 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 114 AccessFlags _access_flags; // Access flags 115 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 116 // note: can have vtables with >2**16 elements (because of inheritance) 117 #ifdef CC_INTERP 118 int _result_index; // C++ interpreter needs for converting results to/from stack 119 #endif 120 u2 _method_size; // size of this object 121 u2 _max_stack; // Maximum number of entries on the expression stack 122 u2 _max_locals; // Number of local variables used by this method 123 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words 124 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 125 u1 _jfr_towrite : 1, // Flags 126 _force_inline : 1, 127 _hidden : 1, 128 _dont_inline : 1, 129 : 4; 130 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 131 u2 _number_of_breakpoints; // fullspeed debugging support 132 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 133 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 134 135 #ifdef TIERED 136 jlong _prev_time; // Previous time the rate was acquired 137 float _rate; // Events (invocation and backedge counter increments) per millisecond 138 #endif 139 140 #ifndef PRODUCT 141 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 142 #endif 143 // Entry point for calling both from and to the interpreter. 144 address _i2i_entry; // All-args-on-stack calling convention 145 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked. 146 AdapterHandlerEntry* _adapter; 147 // Entry point for calling from compiled code, to compiled code if it exists 148 // or else the interpreter. 149 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 150 // The entry point for calling both from and to compiled code is 151 // "_code->entry_point()". Because of tiered compilation and de-opt, this 152 // field can come and go. It can transition from NULL to not-null at any 153 // time (whenever a compile completes). It can transition from not-null to 154 // NULL only at safepoints (because of a de-opt). 155 nmethod* volatile _code; // Points to the corresponding piece of native code 156 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 157 158 public: 159 160 // accessors for instance variables 161 constMethodOop constMethod() const { return _constMethod; } 162 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)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 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); } 190 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); } 191 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); } 192 193 #ifdef CC_INTERP 194 void set_result_index(BasicType type); 195 int result_index() { return _result_index; } 196 #endif 197 198 // Helper routine: get klass name + "." + method name + signature as 199 // C string, for the purpose of providing more useful NoSuchMethodErrors 200 // and fatal error handling. The string is allocated in resource 201 // area if a buffer is not provided by the caller. 202 char* name_and_sig_as_C_string() const; 203 char* name_and_sig_as_C_string(char* buf, int size) const; 204 205 // Static routine in the situations we don't have a methodOop 206 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); 207 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); 208 209 Bytecodes::Code java_code_at(int bci) const { 210 return Bytecodes::java_code_at(this, bcp_from(bci)); 211 } 212 Bytecodes::Code code_at(int bci) const { 213 return Bytecodes::code_at(this, bcp_from(bci)); 214 } 215 216 // JVMTI breakpoints 217 Bytecodes::Code orig_bytecode_at(int bci) const; 218 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 219 void set_breakpoint(int bci); 220 void clear_breakpoint(int bci); 221 void clear_all_breakpoints(); 222 // Tracking number of breakpoints, for fullspeed debugging. 223 // Only mutated by VM thread. 224 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 225 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 226 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 227 // Initialization only 228 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 229 230 // index into instanceKlass methods() array 231 // note: also used by jfr 232 u2 method_idnum() const { return constMethod()->method_idnum(); } 233 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 234 235 // code size 236 int code_size() const { return constMethod()->code_size(); } 237 238 // method size 239 int method_size() const { return _method_size; } 240 void set_method_size(int size) { 241 assert(0 <= size && size < (1 << 16), "invalid method size"); 242 _method_size = size; 243 } 244 245 // constant pool for klassOop holding this method 246 constantPoolOop constants() const { return constMethod()->constants(); } 247 void set_constants(constantPoolOop c) { constMethod()->set_constants(c); } 248 249 // max stack 250 // return original max stack size for method verification 251 int verifier_max_stack() const { return _max_stack; } 252 int max_stack() const { return _max_stack + extra_stack_entries(); } 253 void set_max_stack(int size) { _max_stack = size; } 254 255 // max locals 256 int max_locals() const { return _max_locals; } 257 void set_max_locals(int size) { _max_locals = size; } 258 259 int highest_comp_level() const; 260 void set_highest_comp_level(int level); 261 int highest_osr_comp_level() const; 262 void set_highest_osr_comp_level(int level); 263 264 // Count of times method was exited via exception while interpreting 265 void interpreter_throwout_increment() { 266 if (_interpreter_throwout_count < 65534) { 267 _interpreter_throwout_count++; 268 } 269 } 270 271 int interpreter_throwout_count() const { return _interpreter_throwout_count; } 272 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } 273 274 // size of parameters 275 int size_of_parameters() const { return _size_of_parameters; } 276 277 bool has_stackmap_table() const { 278 return constMethod()->has_stackmap_table(); 279 } 280 281 typeArrayOop stackmap_data() const { 282 return constMethod()->stackmap_data(); 283 } 284 285 void set_stackmap_data(typeArrayOop sd) { 286 constMethod()->set_stackmap_data(sd); 287 } 288 289 // exception handler table 290 bool has_exception_handler() const 291 { return constMethod()->has_exception_handler(); } 292 int exception_table_length() const 293 { return constMethod()->exception_table_length(); } 294 ExceptionTableElement* exception_table_start() const 295 { return constMethod()->exception_table_start(); } 296 297 // Finds the first entry point bci of an exception handler for an 298 // exception of klass ex_klass thrown at throw_bci. A value of NULL 299 // for ex_klass indicates that the exception klass is not known; in 300 // this case it matches any constraint class. Returns -1 if the 301 // exception cannot be handled in this method. The handler 302 // constraint classes are loaded if necessary. Note that this may 303 // throw an exception if loading of the constraint classes causes 304 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 305 // If an exception is thrown, returns the bci of the 306 // exception handler which caused the exception to be thrown, which 307 // is needed for proper retries. See, for example, 308 // InterpreterRuntime::exception_handler_for_exception. 309 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); 310 311 // method data access 312 methodDataOop method_data() const { 313 return _method_data; 314 } 315 void set_method_data(methodDataOop data) { 316 oop_store_without_check((oop*)&_method_data, (oop)data); 317 } 318 319 // invocation counter 320 InvocationCounter* invocation_counter() { return &_invocation_counter; } 321 InvocationCounter* backedge_counter() { return &_backedge_counter; } 322 323 #ifdef TIERED 324 // We are reusing interpreter_invocation_count as a holder for the previous event count! 325 // We can do that since interpreter_invocation_count is not used in tiered. 326 int prev_event_count() const { return _interpreter_invocation_count; } 327 void set_prev_event_count(int count) { _interpreter_invocation_count = count; } 328 jlong prev_time() const { return _prev_time; } 329 void set_prev_time(jlong time) { _prev_time = time; } 330 float rate() const { return _rate; } 331 void set_rate(float rate) { _rate = rate; } 332 #endif 333 334 int invocation_count(); 335 int backedge_count(); 336 337 bool was_executed_more_than(int n); 338 bool was_never_executed() { return !was_executed_more_than(0); } 339 340 static void build_interpreter_method_data(methodHandle method, TRAPS); 341 342 int interpreter_invocation_count() { 343 if (TieredCompilation) return invocation_count(); 344 else return _interpreter_invocation_count; 345 } 346 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } 347 int increment_interpreter_invocation_count() { 348 if (TieredCompilation) ShouldNotReachHere(); 349 return ++_interpreter_invocation_count; 350 } 351 352 #ifndef PRODUCT 353 int compiled_invocation_count() const { return _compiled_invocation_count; } 354 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 355 #endif // not PRODUCT 356 357 // Clear (non-shared space) pointers which could not be relevant 358 // if this (shared) method were mapped into another JVM. 359 void remove_unshareable_info(); 360 361 // nmethod/verified compiler entry 362 address verified_code_entry(); 363 bool check_code() const; // Not inline to avoid circular ref 364 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 365 void clear_code(); // Clear out any compiled code 366 static void set_code(methodHandle mh, nmethod* code); 367 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 368 address get_i2c_entry(); 369 address get_c2i_entry(); 370 address get_c2i_unverified_entry(); 371 AdapterHandlerEntry* adapter() { return _adapter; } 372 // setup entry points 373 void link_method(methodHandle method, TRAPS); 374 // clear entry points. Used by sharing code 375 void unlink_method(); 376 377 // vtable index 378 enum VtableIndexFlag { 379 // Valid vtable indexes are non-negative (>= 0). 380 // These few negative values are used as sentinels. 381 highest_unused_vtable_index_value = -5, 382 invalid_vtable_index = -4, // distinct from any valid vtable index 383 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 384 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 385 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 386 }; 387 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 388 int vtable_index() const { assert(valid_vtable_index(), ""); 389 return _vtable_index; } 390 void set_vtable_index(int index) { _vtable_index = index; } 391 392 // interpreter entry 393 address interpreter_entry() const { return _i2i_entry; } 394 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 395 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 396 int interpreter_kind(void) { 397 return constMethod()->interpreter_kind(); 398 } 399 void set_interpreter_kind(); 400 void set_interpreter_kind(int kind) { 401 constMethod()->set_interpreter_kind(kind); 402 } 403 404 // native function (used for native methods only) 405 enum { 406 native_bind_event_is_interesting = true 407 }; 408 address native_function() const { return *(native_function_addr()); } 409 address critical_native_function(); 410 411 // Must specify a real function (not NULL). 412 // Use clear_native_function() to unregister. 413 void set_native_function(address function, bool post_event_flag); 414 bool has_native_function() const; 415 void clear_native_function(); 416 417 // signature handler (used for native methods only) 418 address signature_handler() const { return *(signature_handler_addr()); } 419 void set_signature_handler(address handler); 420 421 // Interpreter oopmap support 422 void mask_for(int bci, InterpreterOopMap* mask); 423 424 #ifndef PRODUCT 425 // operations on invocation counter 426 void print_invocation_count(); 427 #endif 428 429 // byte codes 430 void set_code(address code) { return constMethod()->set_code(code); } 431 address code_base() const { return constMethod()->code_base(); } 432 bool contains(address bcp) const { return constMethod()->contains(bcp); } 433 434 // prints byte codes 435 void print_codes() const { print_codes_on(tty); } 436 void print_codes_on(outputStream* st) const PRODUCT_RETURN; 437 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; 438 439 // checked exceptions 440 int checked_exceptions_length() const 441 { return constMethod()->checked_exceptions_length(); } 442 CheckedExceptionElement* checked_exceptions_start() const 443 { return constMethod()->checked_exceptions_start(); } 444 445 // localvariable table 446 bool has_localvariable_table() const 447 { return constMethod()->has_localvariable_table(); } 448 int localvariable_table_length() const 449 { return constMethod()->localvariable_table_length(); } 450 LocalVariableTableElement* localvariable_table_start() const 451 { return constMethod()->localvariable_table_start(); } 452 453 bool has_linenumber_table() const 454 { return constMethod()->has_linenumber_table(); } 455 u_char* compressed_linenumber_table() const 456 { return constMethod()->compressed_linenumber_table(); } 457 458 // method holder (the klassOop holding this method) 459 klassOop method_holder() const { return constants()->pool_holder(); } 460 461 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 462 Symbol* klass_name() const; // returns the name of the method holder 463 BasicType result_type() const; // type of the method result 464 int result_type_index() const; // type index of the method result 465 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 466 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 467 468 // Checked exceptions thrown by this method (resolved to mirrors) 469 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 470 471 // Access flags 472 bool is_public() const { return access_flags().is_public(); } 473 bool is_private() const { return access_flags().is_private(); } 474 bool is_protected() const { return access_flags().is_protected(); } 475 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 476 bool is_static() const { return access_flags().is_static(); } 477 bool is_final() const { return access_flags().is_final(); } 478 bool is_synchronized() const { return access_flags().is_synchronized();} 479 bool is_native() const { return access_flags().is_native(); } 480 bool is_abstract() const { return access_flags().is_abstract(); } 481 bool is_strict() const { return access_flags().is_strict(); } 482 bool is_synthetic() const { return access_flags().is_synthetic(); } 483 484 // returns true if contains only return operation 485 bool is_empty_method() const; 486 487 // returns true if this is a vanilla constructor 488 bool is_vanilla_constructor() const; 489 490 // checks method and its method holder 491 bool is_final_method() const; 492 bool is_strict_method() const; 493 494 // true if method needs no dynamic dispatch (final and/or no vtable entry) 495 bool can_be_statically_bound() const; 496 497 // returns true if the method has any backward branches. 498 bool has_loops() { 499 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 500 }; 501 502 bool compute_has_loops_flag(); 503 504 bool has_jsrs() { 505 return access_flags().has_jsrs(); 506 }; 507 void set_has_jsrs() { 508 _access_flags.set_has_jsrs(); 509 } 510 511 // returns true if the method has any monitors. 512 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 513 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 514 515 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 516 517 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 518 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 519 // has not been computed yet. 520 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 521 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 522 523 // returns true if the method is an accessor function (setter/getter). 524 bool is_accessor() const; 525 526 // returns true if the method is an initializer (<init> or <clinit>). 527 bool is_initializer() const; 528 529 // returns true if the method is static OR if the classfile version < 51 530 bool has_valid_initializer_flags() const; 531 532 // returns true if the method name is <clinit> and the method has 533 // valid static initializer flags. 534 bool is_static_initializer() const; 535 536 // compiled code support 537 // NOTE: code() is inherently racy as deopt can be clearing code 538 // simultaneously. Use with caution. 539 bool has_compiled_code() const { return code() != NULL; } 540 541 // sizing 542 static int object_size(bool is_native); 543 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; } 544 int object_size() const { return method_size(); } 545 546 bool object_is_parsable() const { return method_size() > 0; } 547 548 // interpreter support 549 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); } 550 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); } 551 #ifdef CC_INTERP 552 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); } 553 #endif /* CC_INTERP */ 554 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); } 555 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); } 556 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); } 557 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); } 558 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); } 559 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); } 560 static ByteSize method_data_offset() { 561 return byte_offset_of(methodOopDesc, _method_data); 562 } 563 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); } 564 #ifndef PRODUCT 565 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); } 566 #endif // not PRODUCT 567 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); } 568 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); } 569 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); } 570 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); } 571 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); } 572 573 // for code generation 574 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); } 575 static int interpreter_invocation_counter_offset_in_bytes() 576 { return offset_of(methodOopDesc, _interpreter_invocation_count); } 577 static int intrinsic_id_offset_in_bytes() { return offset_of(methodOopDesc, _intrinsic_id); } 578 static int intrinsic_id_size_in_bytes() { return sizeof(u1); } 579 580 // Static methods that are used to implement member methods where an exposed this pointer 581 // is needed due to possible GCs 582 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS); 583 584 // Returns the byte code index from the byte code pointer 585 int bci_from(address bcp) const; 586 address bcp_from(int bci) const; 587 int validate_bci_from_bcx(intptr_t bcx) const; 588 589 // Returns the line number for a bci if debugging information for the method is prowided, 590 // -1 is returned otherwise. 591 int line_number_from_bci(int bci) const; 592 593 // Reflection support 594 bool is_overridden_in(klassOop k) const; 595 596 // JSR 292 support 597 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) 598 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm 599 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. 600 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual 601 Symbol* signature, //anything at all 602 TRAPS); 603 static klassOop check_non_bcp_klass(klassOop klass); 604 // these operate only on invoke methods: 605 // presize interpreter frames for extra interpreter stack entries, if needed 606 // method handles want to be able to push a few extra values (e.g., a bound receiver), and 607 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, 608 // all without checking for a stack overflow 609 static int extra_stack_entries() { return EnableInvokeDynamic ? 2 : 0; } 610 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize() 611 612 // RedefineClasses() support: 613 bool is_old() const { return access_flags().is_old(); } 614 void set_is_old() { _access_flags.set_is_old(); } 615 bool is_obsolete() const { return access_flags().is_obsolete(); } 616 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 617 // see the definition in methodOop.cpp for the gory details 618 bool should_not_be_cached() const; 619 620 // JVMTI Native method prefixing support: 621 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 622 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 623 624 // Rewriting support 625 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 626 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 627 628 // Get this method's jmethodID -- allocate if it doesn't exist 629 jmethodID jmethod_id() { methodHandle this_h(this); 630 return instanceKlass::get_jmethod_id(method_holder(), this_h); } 631 632 // Lookup the jmethodID for this method. Return NULL if not found. 633 // NOTE that this function can be called from a signal handler 634 // (see AsyncGetCallTrace support for Forte Analyzer) and this 635 // needs to be async-safe. No allocation should be done and 636 // so handles are not used to avoid deadlock. 637 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); } 638 639 // JNI static invoke cached itable index accessors 640 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } 641 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } 642 643 // Support for inlining of intrinsic methods 644 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 645 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 646 647 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 648 void init_intrinsic_id(); // updates from _none if a match 649 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder); 650 651 bool jfr_towrite() { return _jfr_towrite; } 652 void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; } 653 654 bool force_inline() { return _force_inline; } 655 void set_force_inline(bool x) { _force_inline = x; } 656 bool dont_inline() { return _dont_inline; } 657 void set_dont_inline(bool x) { _dont_inline = x; } 658 bool is_hidden() { return _hidden; } 659 void set_hidden(bool x) { _hidden = x; } 660 661 // On-stack replacement support 662 bool has_osr_nmethod(int level, bool match_level) { 663 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 664 } 665 666 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 667 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level); 668 } 669 670 // Inline cache support 671 void cleanup_inline_caches(); 672 673 // Find if klass for method is loaded 674 bool is_klass_loaded_by_klass_index(int klass_index) const; 675 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 676 677 // Indicates whether compilation failed earlier for this method, or 678 // whether it is not compilable for another reason like having a 679 // breakpoint set in it. 680 bool is_not_compilable(int comp_level = CompLevel_any) const; 681 void set_not_compilable(int comp_level = CompLevel_all, bool report = true); 682 void set_not_compilable_quietly(int comp_level = CompLevel_all) { 683 set_not_compilable(comp_level, false); 684 } 685 bool is_not_osr_compilable(int comp_level = CompLevel_any) const; 686 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true); 687 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) { 688 set_not_osr_compilable(comp_level, false); 689 } 690 691 private: 692 void print_made_not_compilable(int comp_level, bool is_osr, bool report); 693 694 public: 695 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 696 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 697 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 698 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 699 700 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit 701 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit 702 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); } 703 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); } 704 705 // Background compilation support 706 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 707 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 708 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 709 710 // Resolve all classes in signature, return 'true' if successful 711 static bool load_signature_classes(methodHandle m, TRAPS); 712 713 // Return if true if not all classes references in signature, including return type, has been loaded 714 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 715 716 // Printing 717 void print_short_name(outputStream* st = tty) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM 718 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" 719 720 // Helper routine used for method sorting 721 static void sort_methods(objArrayOop methods, 722 objArrayOop methods_annotations, 723 objArrayOop methods_parameter_annotations, 724 objArrayOop methods_default_annotations, 725 bool idempotent = false); 726 727 // size of parameters 728 void set_size_of_parameters(int size) { _size_of_parameters = size; } 729 private: 730 731 // Inlined elements 732 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 733 address* signature_handler_addr() const { return native_function_addr() + 1; } 734 735 // Garbage collection support 736 oop* adr_constMethod() const { return (oop*)&_constMethod; } 737 oop* adr_method_data() const { return (oop*)&_method_data; } 738 }; 739 740 741 // Utility class for compressing line number tables 742 743 class CompressedLineNumberWriteStream: public CompressedWriteStream { 744 private: 745 int _bci; 746 int _line; 747 public: 748 // Constructor 749 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 750 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 751 752 // Write (bci, line number) pair to stream 753 void write_pair_regular(int bci_delta, int line_delta); 754 755 inline void write_pair_inline(int bci, int line) { 756 int bci_delta = bci - _bci; 757 int line_delta = line - _line; 758 _bci = bci; 759 _line = line; 760 // Skip (0,0) deltas - they do not add information and conflict with terminator. 761 if (bci_delta == 0 && line_delta == 0) return; 762 // Check if bci is 5-bit and line number 3-bit unsigned. 763 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 764 // Compress into single byte. 765 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 766 // Check that value doesn't match escape character. 767 if (value != 0xFF) { 768 write_byte(value); 769 return; 770 } 771 } 772 write_pair_regular(bci_delta, line_delta); 773 } 774 775 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 776 // Disabling optimization doesn't work for methods in header files 777 // so we force it to call through the non-optimized version in the .cpp. 778 // It's gross, but it's the only way we can ensure that all callers are 779 // fixed. _MSC_VER is defined by the windows compiler 780 #if defined(_M_AMD64) && _MSC_VER >= 1400 781 void write_pair(int bci, int line); 782 #else 783 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 784 #endif 785 786 // Write end-of-stream marker 787 void write_terminator() { write_byte(0); } 788 }; 789 790 791 // Utility class for decompressing line number tables 792 793 class CompressedLineNumberReadStream: public CompressedReadStream { 794 private: 795 int _bci; 796 int _line; 797 public: 798 // Constructor 799 CompressedLineNumberReadStream(u_char* buffer); 800 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 801 bool read_pair(); 802 // Accessing bci and line number (after calling read_pair) 803 int bci() const { return _bci; } 804 int line() const { return _line; } 805 }; 806 807 808 /// Fast Breakpoints. 809 810 // If this structure gets more complicated (because bpts get numerous), 811 // move it into its own header. 812 813 // There is presently no provision for concurrent access 814 // to breakpoint lists, which is only OK for JVMTI because 815 // breakpoints are written only at safepoints, and are read 816 // concurrently only outside of safepoints. 817 818 class BreakpointInfo : public CHeapObj<mtClass> { 819 friend class VMStructs; 820 private: 821 Bytecodes::Code _orig_bytecode; 822 int _bci; 823 u2 _name_index; // of method 824 u2 _signature_index; // of method 825 BreakpointInfo* _next; // simple storage allocation 826 827 public: 828 BreakpointInfo(methodOop m, int bci); 829 830 // accessors 831 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 832 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 833 int bci() { return _bci; } 834 835 BreakpointInfo* next() const { return _next; } 836 void set_next(BreakpointInfo* n) { _next = n; } 837 838 // helps for searchers 839 bool match(const methodOopDesc* m, int bci) { 840 return bci == _bci && match(m); 841 } 842 843 bool match(const methodOopDesc* m) { 844 return _name_index == m->name_index() && 845 _signature_index == m->signature_index(); 846 } 847 848 void set(methodOop method); 849 void clear(methodOop method); 850 }; 851 852 // Utility class for access exception handlers 853 class ExceptionTable : public StackObj { 854 private: 855 ExceptionTableElement* _table; 856 u2 _length; 857 858 public: 859 ExceptionTable(methodOop m) { 860 if (m->has_exception_handler()) { 861 _table = m->exception_table_start(); 862 _length = m->exception_table_length(); 863 } else { 864 _table = NULL; 865 _length = 0; 866 } 867 } 868 869 int length() const { 870 return _length; 871 } 872 873 u2 start_pc(int idx) const { 874 assert(idx < _length, "out of bounds"); 875 return _table[idx].start_pc; 876 } 877 878 void set_start_pc(int idx, u2 value) { 879 assert(idx < _length, "out of bounds"); 880 _table[idx].start_pc = value; 881 } 882 883 u2 end_pc(int idx) const { 884 assert(idx < _length, "out of bounds"); 885 return _table[idx].end_pc; 886 } 887 888 void set_end_pc(int idx, u2 value) { 889 assert(idx < _length, "out of bounds"); 890 _table[idx].end_pc = value; 891 } 892 893 u2 handler_pc(int idx) const { 894 assert(idx < _length, "out of bounds"); 895 return _table[idx].handler_pc; 896 } 897 898 void set_handler_pc(int idx, u2 value) { 899 assert(idx < _length, "out of bounds"); 900 _table[idx].handler_pc = value; 901 } 902 903 u2 catch_type_index(int idx) const { 904 assert(idx < _length, "out of bounds"); 905 return _table[idx].catch_type_index; 906 } 907 908 void set_catch_type_index(int idx, u2 value) { 909 assert(idx < _length, "out of bounds"); 910 _table[idx].catch_type_index = value; 911 } 912 }; 913 914 #endif // SHARE_VM_OOPS_METHODOOP_HPP