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 // | constants (oop) | 68 // |------------------------------------------------------| 69 // | methodData (oop) | 70 // | interp_invocation_count | 71 // |------------------------------------------------------| 72 // | access_flags | 73 // | vtable_index | 74 // |------------------------------------------------------| 75 // | result_index (C++ interpreter only) | 76 // |------------------------------------------------------| 77 // | method_size | max_stack | 78 // | max_locals | size_of_parameters | 79 // |------------------------------------------------------| 80 // |intrinsic_id| flags | throwout_count | 81 // |------------------------------------------------------| 82 // | num_breakpoints | (unused) | 83 // |------------------------------------------------------| 84 // | invocation_counter | 85 // | backedge_counter | 86 // |------------------------------------------------------| 87 // | prev_time (tiered only, 64 bit wide) | 88 // | | 89 // |------------------------------------------------------| 90 // | rate (tiered) | 91 // |------------------------------------------------------| 92 // | code (pointer) | 93 // | i2i (pointer) | 94 // | adapter (pointer) | 95 // | from_compiled_entry (pointer) | 96 // | from_interpreted_entry (pointer) | 97 // |------------------------------------------------------| 98 // | native_function (present only if native) | 99 // | signature_handler (present only if native) | 100 // |------------------------------------------------------| 101 102 103 class CheckedExceptionElement; 104 class LocalVariableTableElement; 105 class AdapterHandlerEntry; 106 class methodDataOopDesc; 107 108 class methodOopDesc : public oopDesc { 109 friend class methodKlass; 110 friend class VMStructs; 111 private: 112 constMethodOop _constMethod; // Method read-only data. 113 constantPoolOop _constants; // Constant pool 114 methodDataOop _method_data; 115 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 116 AccessFlags _access_flags; // Access flags 117 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 118 // note: can have vtables with >2**16 elements (because of inheritance) 119 #ifdef CC_INTERP 120 int _result_index; // C++ interpreter needs for converting results to/from stack 121 #endif 122 u2 _method_size; // size of this object 123 u2 _max_stack; // Maximum number of entries on the expression stack 124 u2 _max_locals; // Number of local variables used by this method 125 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words 126 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 127 u1 _jfr_towrite : 1, // Flags 128 : 7; 129 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 130 u2 _number_of_breakpoints; // fullspeed debugging support 131 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 132 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 133 134 #ifdef TIERED 135 jlong _prev_time; // Previous time the rate was acquired 136 float _rate; // Events (invocation and backedge counter increments) per millisecond 137 #endif 138 139 #ifndef PRODUCT 140 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 141 #endif 142 // Entry point for calling both from and to the interpreter. 143 address _i2i_entry; // All-args-on-stack calling convention 144 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked. 145 AdapterHandlerEntry* _adapter; 146 // Entry point for calling from compiled code, to compiled code if it exists 147 // or else the interpreter. 148 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 149 // The entry point for calling both from and to compiled code is 150 // "_code->entry_point()". Because of tiered compilation and de-opt, this 151 // field can come and go. It can transition from NULL to not-null at any 152 // time (whenever a compile completes). It can transition from not-null to 153 // NULL only at safepoints (because of a de-opt). 154 nmethod* volatile _code; // Points to the corresponding piece of native code 155 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 156 157 public: 158 159 // accessors for instance variables 160 constMethodOop constMethod() const { return _constMethod; } 161 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); } 162 163 164 static address make_adapters(methodHandle mh, TRAPS); 165 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 166 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 167 168 // access flag 169 AccessFlags access_flags() const { return _access_flags; } 170 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 171 172 // name 173 Symbol* name() const { return _constants->symbol_at(name_index()); } 174 int name_index() const { return constMethod()->name_index(); } 175 void set_name_index(int index) { constMethod()->set_name_index(index); } 176 177 // signature 178 Symbol* signature() const { return _constants->symbol_at(signature_index()); } 179 int signature_index() const { return constMethod()->signature_index(); } 180 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 181 182 // generics support 183 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (Symbol*)NULL); } 184 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 185 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 186 187 // annotations support 188 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); } 189 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); } 190 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); } 191 192 #ifdef CC_INTERP 193 void set_result_index(BasicType type); 194 int result_index() { return _result_index; } 195 #endif 196 197 // Helper routine: get klass name + "." + method name + signature as 198 // C string, for the purpose of providing more useful NoSuchMethodErrors 199 // and fatal error handling. The string is allocated in resource 200 // area if a buffer is not provided by the caller. 201 char* name_and_sig_as_C_string(); 202 char* name_and_sig_as_C_string(char* buf, int size); 203 204 // Static routine in the situations we don't have a methodOop 205 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); 206 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); 207 208 Bytecodes::Code java_code_at(int bci) const { 209 return Bytecodes::java_code_at(this, bcp_from(bci)); 210 } 211 Bytecodes::Code code_at(int bci) const { 212 return Bytecodes::code_at(this, bcp_from(bci)); 213 } 214 215 // JVMTI breakpoints 216 Bytecodes::Code orig_bytecode_at(int bci) const; 217 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 218 void set_breakpoint(int bci); 219 void clear_breakpoint(int bci); 220 void clear_all_breakpoints(); 221 // Tracking number of breakpoints, for fullspeed debugging. 222 // Only mutated by VM thread. 223 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 224 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 225 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 226 // Initialization only 227 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 228 229 // index into instanceKlass methods() array 230 // note: also used by jfr 231 u2 method_idnum() const { return constMethod()->method_idnum(); } 232 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 233 234 // code size 235 int code_size() const { return constMethod()->code_size(); } 236 237 // method size 238 int method_size() const { return _method_size; } 239 void set_method_size(int size) { 240 assert(0 <= size && size < (1 << 16), "invalid method size"); 241 _method_size = size; 242 } 243 244 // constant pool for klassOop holding this method 245 constantPoolOop constants() const { return _constants; } 246 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); } 247 248 // max stack 249 int max_stack() const { return _max_stack; } 250 void set_max_stack(int size) { _max_stack = size; } 251 252 // max locals 253 int max_locals() const { return _max_locals; } 254 void set_max_locals(int size) { _max_locals = size; } 255 256 int highest_comp_level() const; 257 void set_highest_comp_level(int level); 258 int highest_osr_comp_level() const; 259 void set_highest_osr_comp_level(int level); 260 261 // Count of times method was exited via exception while interpreting 262 void interpreter_throwout_increment() { 263 if (_interpreter_throwout_count < 65534) { 264 _interpreter_throwout_count++; 265 } 266 } 267 268 int interpreter_throwout_count() const { return _interpreter_throwout_count; } 269 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } 270 271 // size of parameters 272 int size_of_parameters() const { return _size_of_parameters; } 273 274 bool has_stackmap_table() const { 275 return constMethod()->has_stackmap_table(); 276 } 277 278 typeArrayOop stackmap_data() const { 279 return constMethod()->stackmap_data(); 280 } 281 282 void set_stackmap_data(typeArrayOop sd) { 283 constMethod()->set_stackmap_data(sd); 284 } 285 286 // exception handler table 287 typeArrayOop exception_table() const 288 { return constMethod()->exception_table(); } 289 void set_exception_table(typeArrayOop e) 290 { constMethod()->set_exception_table(e); } 291 bool has_exception_handler() const 292 { return constMethod()->has_exception_handler(); } 293 294 // Finds the first entry point bci of an exception handler for an 295 // exception of klass ex_klass thrown at throw_bci. A value of NULL 296 // for ex_klass indicates that the exception klass is not known; in 297 // this case it matches any constraint class. Returns -1 if the 298 // exception cannot be handled in this method. The handler 299 // constraint classes are loaded if necessary. Note that this may 300 // throw an exception if loading of the constraint classes causes 301 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 302 // If an exception is thrown, returns the bci of the 303 // exception handler which caused the exception to be thrown, which 304 // is needed for proper retries. See, for example, 305 // InterpreterRuntime::exception_handler_for_exception. 306 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); 307 308 // method data access 309 methodDataOop method_data() const { 310 return _method_data; 311 } 312 void set_method_data(methodDataOop data) { 313 oop_store_without_check((oop*)&_method_data, (oop)data); 314 } 315 316 // invocation counter 317 InvocationCounter* invocation_counter() { return &_invocation_counter; } 318 InvocationCounter* backedge_counter() { return &_backedge_counter; } 319 320 #ifdef TIERED 321 // We are reusing interpreter_invocation_count as a holder for the previous event count! 322 // We can do that since interpreter_invocation_count is not used in tiered. 323 int prev_event_count() const { return _interpreter_invocation_count; } 324 void set_prev_event_count(int count) { _interpreter_invocation_count = count; } 325 jlong prev_time() const { return _prev_time; } 326 void set_prev_time(jlong time) { _prev_time = time; } 327 float rate() const { return _rate; } 328 void set_rate(float rate) { _rate = rate; } 329 #endif 330 331 int invocation_count(); 332 int backedge_count(); 333 334 bool was_executed_more_than(int n); 335 bool was_never_executed() { return !was_executed_more_than(0); } 336 337 static void build_interpreter_method_data(methodHandle method, TRAPS); 338 339 int interpreter_invocation_count() { 340 if (TieredCompilation) return invocation_count(); 341 else return _interpreter_invocation_count; 342 } 343 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } 344 int increment_interpreter_invocation_count() { 345 if (TieredCompilation) ShouldNotReachHere(); 346 return ++_interpreter_invocation_count; 347 } 348 349 #ifndef PRODUCT 350 int compiled_invocation_count() const { return _compiled_invocation_count; } 351 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 352 #endif // not PRODUCT 353 354 // Clear (non-shared space) pointers which could not be relevant 355 // if this (shared) method were mapped into another JVM. 356 void remove_unshareable_info(); 357 358 // nmethod/verified compiler entry 359 address verified_code_entry(); 360 bool check_code() const; // Not inline to avoid circular ref 361 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 362 void clear_code(); // Clear out any compiled code 363 static void set_code(methodHandle mh, nmethod* code); 364 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 365 address get_i2c_entry(); 366 address get_c2i_entry(); 367 address get_c2i_unverified_entry(); 368 AdapterHandlerEntry* adapter() { return _adapter; } 369 // setup entry points 370 void link_method(methodHandle method, TRAPS); 371 // clear entry points. Used by sharing code 372 void unlink_method(); 373 374 // vtable index 375 enum VtableIndexFlag { 376 // Valid vtable indexes are non-negative (>= 0). 377 // These few negative values are used as sentinels. 378 highest_unused_vtable_index_value = -5, 379 invalid_vtable_index = -4, // distinct from any valid vtable index 380 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 381 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 382 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 383 }; 384 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 385 int vtable_index() const { assert(valid_vtable_index(), ""); 386 return _vtable_index; } 387 void set_vtable_index(int index) { _vtable_index = index; } 388 389 // interpreter entry 390 address interpreter_entry() const { return _i2i_entry; } 391 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 392 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 393 int interpreter_kind(void) { 394 return constMethod()->interpreter_kind(); 395 } 396 void set_interpreter_kind(); 397 void set_interpreter_kind(int kind) { 398 constMethod()->set_interpreter_kind(kind); 399 } 400 401 // native function (used for native methods only) 402 enum { 403 native_bind_event_is_interesting = true 404 }; 405 address native_function() const { return *(native_function_addr()); } 406 address critical_native_function(); 407 408 // Must specify a real function (not NULL). 409 // Use clear_native_function() to unregister. 410 void set_native_function(address function, bool post_event_flag); 411 bool has_native_function() const; 412 void clear_native_function(); 413 414 // signature handler (used for native methods only) 415 address signature_handler() const { return *(signature_handler_addr()); } 416 void set_signature_handler(address handler); 417 418 // Interpreter oopmap support 419 void mask_for(int bci, InterpreterOopMap* mask); 420 421 #ifndef PRODUCT 422 // operations on invocation counter 423 void print_invocation_count(); 424 #endif 425 426 // byte codes 427 void set_code(address code) { return constMethod()->set_code(code); } 428 address code_base() const { return constMethod()->code_base(); } 429 bool contains(address bcp) const { return constMethod()->contains(bcp); } 430 431 // prints byte codes 432 void print_codes() const { print_codes_on(tty); } 433 void print_codes_on(outputStream* st) const PRODUCT_RETURN; 434 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; 435 436 // checked exceptions 437 int checked_exceptions_length() const 438 { return constMethod()->checked_exceptions_length(); } 439 CheckedExceptionElement* checked_exceptions_start() const 440 { return constMethod()->checked_exceptions_start(); } 441 442 // localvariable table 443 bool has_localvariable_table() const 444 { return constMethod()->has_localvariable_table(); } 445 int localvariable_table_length() const 446 { return constMethod()->localvariable_table_length(); } 447 LocalVariableTableElement* localvariable_table_start() const 448 { return constMethod()->localvariable_table_start(); } 449 450 bool has_linenumber_table() const 451 { return constMethod()->has_linenumber_table(); } 452 u_char* compressed_linenumber_table() const 453 { return constMethod()->compressed_linenumber_table(); } 454 455 // method holder (the klassOop holding this method) 456 klassOop method_holder() const { return _constants->pool_holder(); } 457 458 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 459 Symbol* klass_name() const; // returns the name of the method holder 460 BasicType result_type() const; // type of the method result 461 int result_type_index() const; // type index of the method result 462 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 463 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 464 465 // Checked exceptions thrown by this method (resolved to mirrors) 466 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 467 468 // Access flags 469 bool is_public() const { return access_flags().is_public(); } 470 bool is_private() const { return access_flags().is_private(); } 471 bool is_protected() const { return access_flags().is_protected(); } 472 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 473 bool is_static() const { return access_flags().is_static(); } 474 bool is_final() const { return access_flags().is_final(); } 475 bool is_synchronized() const { return access_flags().is_synchronized();} 476 bool is_native() const { return access_flags().is_native(); } 477 bool is_abstract() const { return access_flags().is_abstract(); } 478 bool is_strict() const { return access_flags().is_strict(); } 479 bool is_synthetic() const { return access_flags().is_synthetic(); } 480 481 // returns true if contains only return operation 482 bool is_empty_method() const; 483 484 // returns true if this is a vanilla constructor 485 bool is_vanilla_constructor() const; 486 487 // checks method and its method holder 488 bool is_final_method() const; 489 bool is_strict_method() const; 490 491 // true if method needs no dynamic dispatch (final and/or no vtable entry) 492 bool can_be_statically_bound() const; 493 494 // returns true if the method has any backward branches. 495 bool has_loops() { 496 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 497 }; 498 499 bool compute_has_loops_flag(); 500 501 bool has_jsrs() { 502 return access_flags().has_jsrs(); 503 }; 504 void set_has_jsrs() { 505 _access_flags.set_has_jsrs(); 506 } 507 508 // returns true if the method has any monitors. 509 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 510 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 511 512 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 513 514 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 515 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 516 // has not been computed yet. 517 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 518 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 519 520 // returns true if the method is an accessor function (setter/getter). 521 bool is_accessor() const; 522 523 // returns true if the method is an initializer (<init> or <clinit>). 524 bool is_initializer() const; 525 526 // returns true if the method is static OR if the classfile version < 51 527 bool has_valid_initializer_flags() const; 528 529 // returns true if the method name is <clinit> and the method has 530 // valid static initializer flags. 531 bool is_static_initializer() const; 532 533 // compiled code support 534 // NOTE: code() is inherently racy as deopt can be clearing code 535 // simultaneously. Use with caution. 536 bool has_compiled_code() const { return code() != NULL; } 537 538 // sizing 539 static int object_size(bool is_native); 540 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; } 541 int object_size() const { return method_size(); } 542 543 bool object_is_parsable() const { return method_size() > 0; } 544 545 // interpreter support 546 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); } 547 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); } 548 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); } 549 #ifdef CC_INTERP 550 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); } 551 #endif /* CC_INTERP */ 552 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); } 553 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); } 554 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); } 555 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); } 556 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); } 557 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); } 558 static ByteSize method_data_offset() { 559 return byte_offset_of(methodOopDesc, _method_data); 560 } 561 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); } 562 #ifndef PRODUCT 563 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); } 564 #endif // not PRODUCT 565 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); } 566 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); } 567 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); } 568 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); } 569 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); } 570 571 // for code generation 572 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); } 573 static int interpreter_invocation_counter_offset_in_bytes() 574 { return offset_of(methodOopDesc, _interpreter_invocation_count); } 575 static int intrinsic_id_offset_in_bytes() { return offset_of(methodOopDesc, _intrinsic_id); } 576 static int intrinsic_id_size_in_bytes() { return sizeof(u1); } 577 578 // Static methods that are used to implement member methods where an exposed this pointer 579 // is needed due to possible GCs 580 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS); 581 582 // Returns the byte code index from the byte code pointer 583 int bci_from(address bcp) const; 584 address bcp_from(int bci) const; 585 int validate_bci_from_bcx(intptr_t bcx) const; 586 587 // Returns the line number for a bci if debugging information for the method is prowided, 588 // -1 is returned otherwise. 589 int line_number_from_bci(int bci) const; 590 591 // Reflection support 592 bool is_overridden_in(klassOop k) const; 593 594 // JSR 292 support 595 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); } 596 static bool is_method_handle_invoke_name(vmSymbols::SID name_sid); 597 static bool is_method_handle_invoke_name(Symbol* name) { 598 return is_method_handle_invoke_name(vmSymbols::find_sid(name)); 599 } 600 // Tests if this method is an internal adapter frame from the 601 // MethodHandleCompiler. 602 bool is_method_handle_adapter() const; 603 static methodHandle make_invoke_method(KlassHandle holder, 604 Symbol* name, //invokeExact or invokeGeneric 605 Symbol* signature, //anything at all 606 Handle method_type, 607 TRAPS); 608 static klassOop check_non_bcp_klass(klassOop klass); 609 // these operate only on invoke methods: 610 oop method_handle_type() const; 611 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1 612 // presize interpreter frames for extra interpreter stack entries, if needed 613 // method handles want to be able to push a few extra values (e.g., a bound receiver), and 614 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, 615 // all without checking for a stack overflow 616 static int extra_stack_entries() { return EnableInvokeDynamic ? (int) MethodHandlePushLimit + 3 : 0; } 617 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize() 618 619 // RedefineClasses() support: 620 bool is_old() const { return access_flags().is_old(); } 621 void set_is_old() { _access_flags.set_is_old(); } 622 bool is_obsolete() const { return access_flags().is_obsolete(); } 623 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 624 // see the definition in methodOop.cpp for the gory details 625 bool should_not_be_cached() const; 626 627 // JVMTI Native method prefixing support: 628 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 629 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 630 631 // Rewriting support 632 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 633 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 634 635 // Get this method's jmethodID -- allocate if it doesn't exist 636 jmethodID jmethod_id() { methodHandle this_h(this); 637 return instanceKlass::get_jmethod_id(method_holder(), this_h); } 638 639 // Lookup the jmethodID for this method. Return NULL if not found. 640 // NOTE that this function can be called from a signal handler 641 // (see AsyncGetCallTrace support for Forte Analyzer) and this 642 // needs to be async-safe. No allocation should be done and 643 // so handles are not used to avoid deadlock. 644 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); } 645 646 // JNI static invoke cached itable index accessors 647 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } 648 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } 649 650 // Support for inlining of intrinsic methods 651 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 652 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 653 654 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 655 void init_intrinsic_id(); // updates from _none if a match 656 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder); 657 658 bool jfr_towrite() { return _jfr_towrite; } 659 void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; } 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 return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable(); 687 } 688 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); } 689 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 690 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 691 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 692 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 693 694 // Background compilation support 695 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 696 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 697 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 698 699 // Resolve all classes in signature, return 'true' if successful 700 static bool load_signature_classes(methodHandle m, TRAPS); 701 702 // Return if true if not all classes references in signature, including return type, has been loaded 703 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 704 705 // Printing 706 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM 707 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)" 708 709 // Helper routine used for method sorting 710 static void sort_methods(objArrayOop methods, 711 objArrayOop methods_annotations, 712 objArrayOop methods_parameter_annotations, 713 objArrayOop methods_default_annotations, 714 bool idempotent = false); 715 716 // size of parameters 717 void set_size_of_parameters(int size) { _size_of_parameters = size; } 718 private: 719 720 // Inlined elements 721 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 722 address* signature_handler_addr() const { return native_function_addr() + 1; } 723 724 // Garbage collection support 725 oop* adr_constMethod() const { return (oop*)&_constMethod; } 726 oop* adr_constants() const { return (oop*)&_constants; } 727 oop* adr_method_data() const { return (oop*)&_method_data; } 728 }; 729 730 731 // Utility class for compressing line number tables 732 733 class CompressedLineNumberWriteStream: public CompressedWriteStream { 734 private: 735 int _bci; 736 int _line; 737 public: 738 // Constructor 739 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 740 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 741 742 // Write (bci, line number) pair to stream 743 void write_pair_regular(int bci_delta, int line_delta); 744 745 inline void write_pair_inline(int bci, int line) { 746 int bci_delta = bci - _bci; 747 int line_delta = line - _line; 748 _bci = bci; 749 _line = line; 750 // Skip (0,0) deltas - they do not add information and conflict with terminator. 751 if (bci_delta == 0 && line_delta == 0) return; 752 // Check if bci is 5-bit and line number 3-bit unsigned. 753 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 754 // Compress into single byte. 755 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 756 // Check that value doesn't match escape character. 757 if (value != 0xFF) { 758 write_byte(value); 759 return; 760 } 761 } 762 write_pair_regular(bci_delta, line_delta); 763 } 764 765 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 766 // Disabling optimization doesn't work for methods in header files 767 // so we force it to call through the non-optimized version in the .cpp. 768 // It's gross, but it's the only way we can ensure that all callers are 769 // fixed. _MSC_VER is defined by the windows compiler 770 #if defined(_M_AMD64) && _MSC_VER >= 1400 771 void write_pair(int bci, int line); 772 #else 773 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 774 #endif 775 776 // Write end-of-stream marker 777 void write_terminator() { write_byte(0); } 778 }; 779 780 781 // Utility class for decompressing line number tables 782 783 class CompressedLineNumberReadStream: public CompressedReadStream { 784 private: 785 int _bci; 786 int _line; 787 public: 788 // Constructor 789 CompressedLineNumberReadStream(u_char* buffer); 790 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 791 bool read_pair(); 792 // Accessing bci and line number (after calling read_pair) 793 int bci() const { return _bci; } 794 int line() const { return _line; } 795 }; 796 797 798 /// Fast Breakpoints. 799 800 // If this structure gets more complicated (because bpts get numerous), 801 // move it into its own header. 802 803 // There is presently no provision for concurrent access 804 // to breakpoint lists, which is only OK for JVMTI because 805 // breakpoints are written only at safepoints, and are read 806 // concurrently only outside of safepoints. 807 808 class BreakpointInfo : public CHeapObj { 809 friend class VMStructs; 810 private: 811 Bytecodes::Code _orig_bytecode; 812 int _bci; 813 u2 _name_index; // of method 814 u2 _signature_index; // of method 815 BreakpointInfo* _next; // simple storage allocation 816 817 public: 818 BreakpointInfo(methodOop m, int bci); 819 820 // accessors 821 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 822 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 823 int bci() { return _bci; } 824 825 BreakpointInfo* next() const { return _next; } 826 void set_next(BreakpointInfo* n) { _next = n; } 827 828 // helps for searchers 829 bool match(const methodOopDesc* m, int bci) { 830 return bci == _bci && match(m); 831 } 832 833 bool match(const methodOopDesc* m) { 834 return _name_index == m->name_index() && 835 _signature_index == m->signature_index(); 836 } 837 838 void set(methodOop method); 839 void clear(methodOop method); 840 }; 841 842 #endif // SHARE_VM_OOPS_METHODOOP_HPP