1 /* 2 * Copyright (c) 1997, 2011, 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, (unused) | throwout_count | 81 // |------------------------------------------------------| 82 // | num_breakpoints | (unused) | 83 // |------------------------------------------------------| 84 // | invocation_counter | 85 // | backedge_counter | 86 // |------------------------------------------------------| 87 // | code (pointer) | 88 // | i2i (pointer) | 89 // | adapter (pointer) | 90 // | from_compiled_entry (pointer) | 91 // | from_interpreted_entry (pointer) | 92 // |------------------------------------------------------| 93 // | native_function (present only if native) | 94 // | signature_handler (present only if native) | 95 // |------------------------------------------------------| 96 97 98 class CheckedExceptionElement; 99 class LocalVariableTableElement; 100 class AdapterHandlerEntry; 101 class methodDataOopDesc; 102 103 class methodOopDesc : public oopDesc { 104 friend class methodKlass; 105 friend class VMStructs; 106 private: 107 constMethodOop _constMethod; // Method read-only data. 108 constantPoolOop _constants; // Constant pool 109 methodDataOop _method_data; 110 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 111 AccessFlags _access_flags; // Access flags 112 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 113 // note: can have vtables with >2**16 elements (because of inheritance) 114 #ifdef CC_INTERP 115 int _result_index; // C++ interpreter needs for converting results to/from stack 116 #endif 117 u2 _method_size; // size of this object 118 u2 _max_stack; // Maximum number of entries on the expression stack 119 u2 _max_locals; // Number of local variables used by this method 120 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words 121 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 122 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 123 u2 _number_of_breakpoints; // fullspeed debugging support 124 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 125 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 126 127 #ifndef PRODUCT 128 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 129 #endif 130 // Entry point for calling both from and to the interpreter. 131 address _i2i_entry; // All-args-on-stack calling convention 132 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked. 133 AdapterHandlerEntry* _adapter; 134 // Entry point for calling from compiled code, to compiled code if it exists 135 // or else the interpreter. 136 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 137 // The entry point for calling both from and to compiled code is 138 // "_code->entry_point()". Because of tiered compilation and de-opt, this 139 // field can come and go. It can transition from NULL to not-null at any 140 // time (whenever a compile completes). It can transition from not-null to 141 // NULL only at safepoints (because of a de-opt). 142 nmethod* volatile _code; // Points to the corresponding piece of native code 143 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 144 145 public: 146 147 // accessors for instance variables 148 constMethodOop constMethod() const { return _constMethod; } 149 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); } 150 151 152 static address make_adapters(methodHandle mh, TRAPS); 153 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 154 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 155 156 // access flag 157 AccessFlags access_flags() const { return _access_flags; } 158 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 159 160 // name 161 Symbol* name() const { return _constants->symbol_at(name_index()); } 162 int name_index() const { return constMethod()->name_index(); } 163 void set_name_index(int index) { constMethod()->set_name_index(index); } 164 165 // signature 166 Symbol* signature() const { return _constants->symbol_at(signature_index()); } 167 int signature_index() const { return constMethod()->signature_index(); } 168 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 169 170 // generics support 171 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (Symbol*)NULL); } 172 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 173 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 174 175 // annotations support 176 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); } 177 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); } 178 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); } 179 180 #ifdef CC_INTERP 181 void set_result_index(BasicType type); 182 int result_index() { return _result_index; } 183 #endif 184 185 // Helper routine: get klass name + "." + method name + signature as 186 // C string, for the purpose of providing more useful NoSuchMethodErrors 187 // and fatal error handling. The string is allocated in resource 188 // area if a buffer is not provided by the caller. 189 char* name_and_sig_as_C_string(); 190 char* name_and_sig_as_C_string(char* buf, int size); 191 192 // Static routine in the situations we don't have a methodOop 193 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); 194 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); 195 196 Bytecodes::Code java_code_at(int bci) const { 197 return Bytecodes::java_code_at(this, bcp_from(bci)); 198 } 199 Bytecodes::Code code_at(int bci) const { 200 return Bytecodes::code_at(this, bcp_from(bci)); 201 } 202 203 // JVMTI breakpoints 204 Bytecodes::Code orig_bytecode_at(int bci) const; 205 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 206 void set_breakpoint(int bci); 207 void clear_breakpoint(int bci); 208 void clear_all_breakpoints(); 209 // Tracking number of breakpoints, for fullspeed debugging. 210 // Only mutated by VM thread. 211 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 212 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 213 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 214 // Initialization only 215 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 216 217 // index into instanceKlass methods() array 218 u2 method_idnum() const { return constMethod()->method_idnum(); } 219 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 220 221 // code size 222 int code_size() const { return constMethod()->code_size(); } 223 224 // method size 225 int method_size() const { return _method_size; } 226 void set_method_size(int size) { 227 assert(0 <= size && size < (1 << 16), "invalid method size"); 228 _method_size = size; 229 } 230 231 // constant pool for klassOop holding this method 232 constantPoolOop constants() const { return _constants; } 233 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); } 234 235 // max stack 236 int max_stack() const { return _max_stack; } 237 void set_max_stack(int size) { _max_stack = size; } 238 239 // max locals 240 int max_locals() const { return _max_locals; } 241 void set_max_locals(int size) { _max_locals = size; } 242 243 int highest_comp_level() const; 244 void set_highest_comp_level(int level); 245 int highest_osr_comp_level() const; 246 void set_highest_osr_comp_level(int level); 247 248 // Count of times method was exited via exception while interpreting 249 void interpreter_throwout_increment() { 250 if (_interpreter_throwout_count < 65534) { 251 _interpreter_throwout_count++; 252 } 253 } 254 255 int interpreter_throwout_count() const { return _interpreter_throwout_count; } 256 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } 257 258 // size of parameters 259 int size_of_parameters() const { return _size_of_parameters; } 260 261 bool has_stackmap_table() const { 262 return constMethod()->has_stackmap_table(); 263 } 264 265 typeArrayOop stackmap_data() const { 266 return constMethod()->stackmap_data(); 267 } 268 269 void set_stackmap_data(typeArrayOop sd) { 270 constMethod()->set_stackmap_data(sd); 271 } 272 273 // exception handler table 274 typeArrayOop exception_table() const 275 { return constMethod()->exception_table(); } 276 void set_exception_table(typeArrayOop e) 277 { constMethod()->set_exception_table(e); } 278 bool has_exception_handler() const 279 { return constMethod()->has_exception_handler(); } 280 281 // Finds the first entry point bci of an exception handler for an 282 // exception of klass ex_klass thrown at throw_bci. A value of NULL 283 // for ex_klass indicates that the exception klass is not known; in 284 // this case it matches any constraint class. Returns -1 if the 285 // exception cannot be handled in this method. The handler 286 // constraint classes are loaded if necessary. Note that this may 287 // throw an exception if loading of the constraint classes causes 288 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 289 // If an exception is thrown, returns the bci of the 290 // exception handler which caused the exception to be thrown, which 291 // is needed for proper retries. See, for example, 292 // InterpreterRuntime::exception_handler_for_exception. 293 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); 294 295 // method data access 296 methodDataOop method_data() const { 297 return _method_data; 298 } 299 void set_method_data(methodDataOop data) { 300 oop_store_without_check((oop*)&_method_data, (oop)data); 301 } 302 303 // invocation counter 304 InvocationCounter* invocation_counter() { return &_invocation_counter; } 305 InvocationCounter* backedge_counter() { return &_backedge_counter; } 306 307 int invocation_count(); 308 int backedge_count(); 309 310 bool was_executed_more_than(int n); 311 bool was_never_executed() { return !was_executed_more_than(0); } 312 313 static void build_interpreter_method_data(methodHandle method, TRAPS); 314 315 int interpreter_invocation_count() { 316 if (TieredCompilation) return invocation_count(); 317 else return _interpreter_invocation_count; 318 } 319 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } 320 int increment_interpreter_invocation_count() { 321 if (TieredCompilation) ShouldNotReachHere(); 322 return ++_interpreter_invocation_count; 323 } 324 325 #ifndef PRODUCT 326 int compiled_invocation_count() const { return _compiled_invocation_count; } 327 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 328 #endif // not PRODUCT 329 330 // Clear (non-shared space) pointers which could not be relevant 331 // if this (shared) method were mapped into another JVM. 332 void remove_unshareable_info(); 333 334 // nmethod/verified compiler entry 335 address verified_code_entry(); 336 bool check_code() const; // Not inline to avoid circular ref 337 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 338 void clear_code(); // Clear out any compiled code 339 static void set_code(methodHandle mh, nmethod* code); 340 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 341 address get_i2c_entry(); 342 address get_c2i_entry(); 343 address get_c2i_unverified_entry(); 344 AdapterHandlerEntry* adapter() { return _adapter; } 345 // setup entry points 346 void link_method(methodHandle method, TRAPS); 347 // clear entry points. Used by sharing code 348 void unlink_method(); 349 350 // vtable index 351 enum VtableIndexFlag { 352 // Valid vtable indexes are non-negative (>= 0). 353 // These few negative values are used as sentinels. 354 highest_unused_vtable_index_value = -5, 355 invalid_vtable_index = -4, // distinct from any valid vtable index 356 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 357 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 358 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 359 }; 360 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 361 int vtable_index() const { assert(valid_vtable_index(), ""); 362 return _vtable_index; } 363 void set_vtable_index(int index) { _vtable_index = index; } 364 365 // interpreter entry 366 address interpreter_entry() const { return _i2i_entry; } 367 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 368 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 369 int interpreter_kind(void) { 370 return constMethod()->interpreter_kind(); 371 } 372 void set_interpreter_kind(); 373 void set_interpreter_kind(int kind) { 374 constMethod()->set_interpreter_kind(kind); 375 } 376 377 // native function (used for native methods only) 378 enum { 379 native_bind_event_is_interesting = true 380 }; 381 address native_function() const { return *(native_function_addr()); } 382 // Must specify a real function (not NULL). 383 // Use clear_native_function() to unregister. 384 void set_native_function(address function, bool post_event_flag); 385 bool has_native_function() const; 386 void clear_native_function(); 387 388 // signature handler (used for native methods only) 389 address signature_handler() const { return *(signature_handler_addr()); } 390 void set_signature_handler(address handler); 391 392 // Interpreter oopmap support 393 void mask_for(int bci, InterpreterOopMap* mask); 394 395 #ifndef PRODUCT 396 // operations on invocation counter 397 void print_invocation_count(); 398 #endif 399 400 // byte codes 401 void set_code(address code) { return constMethod()->set_code(code); } 402 address code_base() const { return constMethod()->code_base(); } 403 bool contains(address bcp) const { return constMethod()->contains(bcp); } 404 405 // prints byte codes 406 void print_codes() const { print_codes_on(tty); } 407 void print_codes_on(outputStream* st) const PRODUCT_RETURN; 408 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; 409 410 // checked exceptions 411 int checked_exceptions_length() const 412 { return constMethod()->checked_exceptions_length(); } 413 CheckedExceptionElement* checked_exceptions_start() const 414 { return constMethod()->checked_exceptions_start(); } 415 416 // localvariable table 417 bool has_localvariable_table() const 418 { return constMethod()->has_localvariable_table(); } 419 int localvariable_table_length() const 420 { return constMethod()->localvariable_table_length(); } 421 LocalVariableTableElement* localvariable_table_start() const 422 { return constMethod()->localvariable_table_start(); } 423 424 bool has_linenumber_table() const 425 { return constMethod()->has_linenumber_table(); } 426 u_char* compressed_linenumber_table() const 427 { return constMethod()->compressed_linenumber_table(); } 428 429 // method holder (the klassOop holding this method) 430 klassOop method_holder() const { return _constants->pool_holder(); } 431 432 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 433 Symbol* klass_name() const; // returns the name of the method holder 434 BasicType result_type() const; // type of the method result 435 int result_type_index() const; // type index of the method result 436 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 437 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 438 439 // Checked exceptions thrown by this method (resolved to mirrors) 440 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 441 442 // Access flags 443 bool is_public() const { return access_flags().is_public(); } 444 bool is_private() const { return access_flags().is_private(); } 445 bool is_protected() const { return access_flags().is_protected(); } 446 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 447 bool is_static() const { return access_flags().is_static(); } 448 bool is_final() const { return access_flags().is_final(); } 449 bool is_synchronized() const { return access_flags().is_synchronized();} 450 bool is_native() const { return access_flags().is_native(); } 451 bool is_abstract() const { return access_flags().is_abstract(); } 452 bool is_strict() const { return access_flags().is_strict(); } 453 bool is_synthetic() const { return access_flags().is_synthetic(); } 454 455 // returns true if contains only return operation 456 bool is_empty_method() const; 457 458 // returns true if this is a vanilla constructor 459 bool is_vanilla_constructor() const; 460 461 // checks method and its method holder 462 bool is_final_method() const; 463 bool is_strict_method() const; 464 465 // true if method needs no dynamic dispatch (final and/or no vtable entry) 466 bool can_be_statically_bound() const; 467 468 // returns true if the method has any backward branches. 469 bool has_loops() { 470 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 471 }; 472 473 bool compute_has_loops_flag(); 474 475 bool has_jsrs() { 476 return access_flags().has_jsrs(); 477 }; 478 void set_has_jsrs() { 479 _access_flags.set_has_jsrs(); 480 } 481 482 // returns true if the method has any monitors. 483 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 484 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 485 486 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 487 488 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 489 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 490 // has not been computed yet. 491 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 492 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 493 494 // returns true if the method is an accessor function (setter/getter). 495 bool is_accessor() const; 496 497 // returns true if the method is an initializer (<init> or <clinit>). 498 bool is_initializer() const; 499 500 // compiled code support 501 // NOTE: code() is inherently racy as deopt can be clearing code 502 // simultaneously. Use with caution. 503 bool has_compiled_code() const { return code() != NULL; } 504 505 // sizing 506 static int object_size(bool is_native); 507 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; } 508 int object_size() const { return method_size(); } 509 510 bool object_is_parsable() const { return method_size() > 0; } 511 512 // interpreter support 513 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); } 514 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); } 515 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); } 516 #ifdef CC_INTERP 517 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); } 518 #endif /* CC_INTERP */ 519 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); } 520 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); } 521 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); } 522 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); } 523 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); } 524 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); } 525 static ByteSize method_data_offset() { 526 return byte_offset_of(methodOopDesc, _method_data); 527 } 528 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); } 529 #ifndef PRODUCT 530 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); } 531 #endif // not PRODUCT 532 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); } 533 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); } 534 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); } 535 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); } 536 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); } 537 538 // for code generation 539 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); } 540 static int interpreter_invocation_counter_offset_in_bytes() 541 { return offset_of(methodOopDesc, _interpreter_invocation_count); } 542 static int intrinsic_id_offset_in_bytes() { return offset_of(methodOopDesc, _intrinsic_id); } 543 static int intrinsic_id_size_in_bytes() { return sizeof(u1); } 544 545 // Static methods that are used to implement member methods where an exposed this pointer 546 // is needed due to possible GCs 547 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS); 548 549 // Returns the byte code index from the byte code pointer 550 int bci_from(address bcp) const; 551 address bcp_from(int bci) const; 552 int validate_bci_from_bcx(intptr_t bcx) const; 553 554 // Returns the line number for a bci if debugging information for the method is prowided, 555 // -1 is returned otherwise. 556 int line_number_from_bci(int bci) const; 557 558 // Reflection support 559 bool is_overridden_in(klassOop k) const; 560 561 // JSR 292 support 562 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); } 563 static bool is_method_handle_invoke_name(vmSymbols::SID name_sid); 564 static bool is_method_handle_invoke_name(Symbol* name) { 565 return is_method_handle_invoke_name(vmSymbols::find_sid(name)); 566 } 567 // Tests if this method is an internal adapter frame from the 568 // MethodHandleCompiler. 569 bool is_method_handle_adapter() const; 570 static methodHandle make_invoke_method(KlassHandle holder, 571 Symbol* name, //invokeExact or invokeGeneric 572 Symbol* signature, //anything at all 573 Handle method_type, 574 TRAPS); 575 // these operate only on invoke methods: 576 oop method_handle_type() const; 577 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1 578 // presize interpreter frames for extra interpreter stack entries, if needed 579 // method handles want to be able to push a few extra values (e.g., a bound receiver), and 580 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, 581 // all without checking for a stack overflow 582 static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); } 583 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize() 584 585 // RedefineClasses() support: 586 bool is_old() const { return access_flags().is_old(); } 587 void set_is_old() { _access_flags.set_is_old(); } 588 bool is_obsolete() const { return access_flags().is_obsolete(); } 589 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 590 // see the definition in methodOop.cpp for the gory details 591 bool should_not_be_cached() const; 592 593 // JVMTI Native method prefixing support: 594 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 595 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 596 597 // Rewriting support 598 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 599 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 600 601 // Get this method's jmethodID -- allocate if it doesn't exist 602 jmethodID jmethod_id() { methodHandle this_h(this); 603 return instanceKlass::get_jmethod_id(method_holder(), this_h); } 604 605 // Lookup the jmethodID for this method. Return NULL if not found. 606 // NOTE that this function can be called from a signal handler 607 // (see AsyncGetCallTrace support for Forte Analyzer) and this 608 // needs to be async-safe. No allocation should be done and 609 // so handles are not used to avoid deadlock. 610 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); } 611 612 // JNI static invoke cached itable index accessors 613 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } 614 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } 615 616 // Support for inlining of intrinsic methods 617 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 618 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 619 620 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 621 void init_intrinsic_id(); // updates from _none if a match 622 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder); 623 624 // On-stack replacement support 625 bool has_osr_nmethod(int level, bool match_level) { 626 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 627 } 628 629 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 630 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level); 631 } 632 633 // Inline cache support 634 void cleanup_inline_caches(); 635 636 // Find if klass for method is loaded 637 bool is_klass_loaded_by_klass_index(int klass_index) const; 638 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 639 640 // Indicates whether compilation failed earlier for this method, or 641 // whether it is not compilable for another reason like having a 642 // breakpoint set in it. 643 bool is_not_compilable(int comp_level = CompLevel_any) const; 644 void set_not_compilable(int comp_level = CompLevel_all, bool report = true); 645 void set_not_compilable_quietly(int comp_level = CompLevel_all) { 646 set_not_compilable(comp_level, false); 647 } 648 bool is_not_osr_compilable(int comp_level = CompLevel_any) const { 649 return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable(); 650 } 651 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); } 652 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 653 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 654 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 655 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 656 657 // Background compilation support 658 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 659 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 660 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 661 662 // Resolve all classes in signature, return 'true' if successful 663 static bool load_signature_classes(methodHandle m, TRAPS); 664 665 // Return if true if not all classes references in signature, including return type, has been loaded 666 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 667 668 // Printing 669 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM 670 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)" 671 672 // Helper routine used for method sorting 673 static void sort_methods(objArrayOop methods, 674 objArrayOop methods_annotations, 675 objArrayOop methods_parameter_annotations, 676 objArrayOop methods_default_annotations, 677 bool idempotent = false); 678 679 // size of parameters 680 void set_size_of_parameters(int size) { _size_of_parameters = size; } 681 private: 682 683 // Inlined elements 684 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 685 address* signature_handler_addr() const { return native_function_addr() + 1; } 686 687 // Garbage collection support 688 oop* adr_constMethod() const { return (oop*)&_constMethod; } 689 oop* adr_constants() const { return (oop*)&_constants; } 690 oop* adr_method_data() const { return (oop*)&_method_data; } 691 }; 692 693 694 // Utility class for compressing line number tables 695 696 class CompressedLineNumberWriteStream: public CompressedWriteStream { 697 private: 698 int _bci; 699 int _line; 700 public: 701 // Constructor 702 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 703 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 704 705 // Write (bci, line number) pair to stream 706 void write_pair_regular(int bci_delta, int line_delta); 707 708 inline void write_pair_inline(int bci, int line) { 709 int bci_delta = bci - _bci; 710 int line_delta = line - _line; 711 _bci = bci; 712 _line = line; 713 // Skip (0,0) deltas - they do not add information and conflict with terminator. 714 if (bci_delta == 0 && line_delta == 0) return; 715 // Check if bci is 5-bit and line number 3-bit unsigned. 716 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 717 // Compress into single byte. 718 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 719 // Check that value doesn't match escape character. 720 if (value != 0xFF) { 721 write_byte(value); 722 return; 723 } 724 } 725 write_pair_regular(bci_delta, line_delta); 726 } 727 728 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 729 // Disabling optimization doesn't work for methods in header files 730 // so we force it to call through the non-optimized version in the .cpp. 731 // It's gross, but it's the only way we can ensure that all callers are 732 // fixed. _MSC_VER is defined by the windows compiler 733 #if defined(_M_AMD64) && _MSC_VER >= 1400 734 void write_pair(int bci, int line); 735 #else 736 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 737 #endif 738 739 // Write end-of-stream marker 740 void write_terminator() { write_byte(0); } 741 }; 742 743 744 // Utility class for decompressing line number tables 745 746 class CompressedLineNumberReadStream: public CompressedReadStream { 747 private: 748 int _bci; 749 int _line; 750 public: 751 // Constructor 752 CompressedLineNumberReadStream(u_char* buffer); 753 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 754 bool read_pair(); 755 // Accessing bci and line number (after calling read_pair) 756 int bci() const { return _bci; } 757 int line() const { return _line; } 758 }; 759 760 761 /// Fast Breakpoints. 762 763 // If this structure gets more complicated (because bpts get numerous), 764 // move it into its own header. 765 766 // There is presently no provision for concurrent access 767 // to breakpoint lists, which is only OK for JVMTI because 768 // breakpoints are written only at safepoints, and are read 769 // concurrently only outside of safepoints. 770 771 class BreakpointInfo : public CHeapObj { 772 friend class VMStructs; 773 private: 774 Bytecodes::Code _orig_bytecode; 775 int _bci; 776 u2 _name_index; // of method 777 u2 _signature_index; // of method 778 BreakpointInfo* _next; // simple storage allocation 779 780 public: 781 BreakpointInfo(methodOop m, int bci); 782 783 // accessors 784 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 785 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 786 int bci() { return _bci; } 787 788 BreakpointInfo* next() const { return _next; } 789 void set_next(BreakpointInfo* n) { _next = n; } 790 791 // helps for searchers 792 bool match(const methodOopDesc* m, int bci) { 793 return bci == _bci && match(m); 794 } 795 796 bool match(const methodOopDesc* m) { 797 return _name_index == m->name_index() && 798 _signature_index == m->signature_index(); 799 } 800 801 void set(methodOop method); 802 void clear(methodOop method); 803 }; 804 805 #endif // SHARE_VM_OOPS_METHODOOP_HPP