1 #ifdef USE_PRAGMA_IDENT_HDR 2 #pragma ident "@(#)methodOop.hpp 1.221 08/11/24 12:22:56 JVM" 3 #endif 4 /* 5 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. 6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 7 * 8 * This code is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 only, as 10 * published by the Free Software Foundation. 11 * 12 * This code is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * version 2 for more details (a copy is included in the LICENSE file that 16 * accompanied this code). 17 * 18 * You should have received a copy of the GNU General Public License version 19 * 2 along with this work; if not, write to the Free Software Foundation, 20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 23 * CA 95054 USA or visit www.sun.com if you need additional information or 24 * have any questions. 25 * 26 */ 27 28 // A methodOop represents a Java method. 29 // 30 // Memory layout (each line represents a word). Note that most applications load thousands of methods, 31 // so keeping the size of this structure small has a big impact on footprint. 32 // 33 // We put all oops and method_size first for better gc cache locality. 34 // 35 // The actual bytecodes are inlined after the end of the methodOopDesc struct. 36 // 37 // There are bits in the access_flags telling whether inlined tables are present. 38 // Note that accessing the line number and local variable tables is not performance critical at all. 39 // Accessing the checked exceptions table is used by reflection, so we put that last to make access 40 // to it fast. 41 // 42 // The line number table is compressed and inlined following the byte codes. It is found as the first 43 // byte following the byte codes. The checked exceptions table and the local variable table are inlined 44 // after the line number table, and indexed from the end of the method. We do not compress the checked 45 // exceptions table since the average length is less than 2, and do not bother to compress the local 46 // variable table either since it is mostly absent. 47 // 48 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter) 49 // 50 // |------------------------------------------------------| 51 // | header | 52 // | klass | 53 // |------------------------------------------------------| 54 // | constMethodOop (oop) | 55 // | constants (oop) | 56 // |------------------------------------------------------| 57 // | methodData (oop) | 58 // | interp_invocation_count | 59 // |------------------------------------------------------| 60 // | access_flags | 61 // | vtable_index | 62 // |------------------------------------------------------| 63 // | result_index (C++ interpreter only) | 64 // |------------------------------------------------------| 65 // | method_size | max_stack | 66 // | max_locals | size_of_parameters | 67 // |------------------------------------------------------| 68 // | intrinsic_id, highest_tier | (unused) | 69 // |------------------------------------------------------| 70 // | throwout_count | num_breakpoints | 71 // |------------------------------------------------------| 72 // | invocation_counter | 73 // | backedge_counter | 74 // |------------------------------------------------------| 75 // | code (pointer) | 76 // | i2i (pointer) | 77 // | adapter (pointer) | 78 // | from_compiled_entry (pointer) | 79 // | from_interpreted_entry (pointer) | 80 // |------------------------------------------------------| 81 // | native_function (present only if native) | 82 // | signature_handler (present only if native) | 83 // |------------------------------------------------------| 84 85 86 class CheckedExceptionElement; 87 class LocalVariableTableElement; 88 class AdapterHandlerEntry; 89 90 class methodDataOopDesc; 91 92 class methodOopDesc : public oopDesc { 93 friend class methodKlass; 94 friend class VMStructs; 95 private: 96 constMethodOop _constMethod; // Method read-only data. 97 constantPoolOop _constants; // Constant pool 98 methodDataOop _method_data; 99 int _interpreter_invocation_count; // Count of times invoked 100 AccessFlags _access_flags; // Access flags 101 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 102 // note: can have vtables with >2**16 elements (because of inheritance) 103 #ifdef CC_INTERP 104 int _result_index; // C++ interpreter needs for converting results to/from stack 105 #endif 106 u2 _method_size; // size of this object 107 u2 _max_stack; // Maximum number of entries on the expression stack 108 u2 _max_locals; // Number of local variables used by this method 109 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words 110 u1 _intrinsic_id_cache; // Cache for intrinsic_id; 0 or 1+vmInt::ID 111 u1 _highest_tier_compile; // Highest compile level this method has ever seen. 112 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 113 u2 _number_of_breakpoints; // fullspeed debugging support 114 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 115 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 116 #ifndef PRODUCT 117 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 118 #endif 119 // Entry point for calling both from and to the interpreter. 120 address _i2i_entry; // All-args-on-stack calling convention 121 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked. 122 AdapterHandlerEntry* _adapter; 123 // Entry point for calling from compiled code, to compiled code if it exists 124 // or else the interpreter. 125 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 126 // The entry point for calling both from and to compiled code is 127 // "_code->entry_point()". Because of tiered compilation and de-opt, this 128 // field can come and go. It can transition from NULL to not-null at any 129 // time (whenever a compile completes). It can transition from not-null to 130 // NULL only at safepoints (because of a de-opt). 131 nmethod* volatile _code; // Points to the corresponding piece of native code 132 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 133 134 public: 135 // accessors for instance variables 136 constMethodOop constMethod() const { return _constMethod; } 137 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); } 138 139 140 static address make_adapters(methodHandle mh, TRAPS); 141 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 142 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 143 144 // access flag 145 AccessFlags access_flags() const { return _access_flags; } 146 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 147 148 // name 149 symbolOop name() const { return _constants->symbol_at(name_index()); } 150 int name_index() const { return constMethod()->name_index(); } 151 void set_name_index(int index) { constMethod()->set_name_index(index); } 152 153 // signature 154 symbolOop signature() const { return _constants->symbol_at(signature_index()); } 155 int signature_index() const { return constMethod()->signature_index(); } 156 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 157 158 // generics support 159 symbolOop generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); } 160 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 161 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 162 163 // annotations support 164 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); } 165 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); } 166 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); } 167 168 #ifdef CC_INTERP 169 void set_result_index(BasicType type); 170 int result_index() { return _result_index; } 171 #endif 172 173 // Helper routine: get klass name + "." + method name + signature as 174 // C string, for the purpose of providing more useful NoSuchMethodErrors 175 // and fatal error handling. The string is allocated in resource 176 // area if a buffer is not provided by the caller. 177 char* name_and_sig_as_C_string(); 178 char* name_and_sig_as_C_string(char* buf, int size); 179 180 // Static routine in the situations we don't have a methodOop 181 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature); 182 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size); 183 184 // JVMTI breakpoints 185 Bytecodes::Code orig_bytecode_at(int bci); 186 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 187 void set_breakpoint(int bci); 188 void clear_breakpoint(int bci); 189 void clear_all_breakpoints(); 190 // Tracking number of breakpoints, for fullspeed debugging. 191 // Only mutated by VM thread. 192 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 193 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 194 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 195 // Initialization only 196 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 197 198 // index into instanceKlass methods() array 199 u2 method_idnum() const { return constMethod()->method_idnum(); } 200 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 201 202 // code size 203 int code_size() const { return constMethod()->code_size(); } 204 205 // method size 206 int method_size() const { return _method_size; } 207 void set_method_size(int size) { 208 assert(0 <= size && size < (1 << 16), "invalid method size"); 209 _method_size = size; 210 } 211 212 // constant pool for klassOop holding this method 213 constantPoolOop constants() const { return _constants; } 214 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); } 215 216 // max stack 217 int max_stack() const { return _max_stack; } 218 void set_max_stack(int size) { _max_stack = size; } 219 220 // max locals 221 int max_locals() const { return _max_locals; } 222 void set_max_locals(int size) { _max_locals = size; } 223 int highest_tier_compile() { return _highest_tier_compile;} 224 void set_highest_tier_compile(int level) { _highest_tier_compile = level;} 225 226 void clear_intrinsic_id_cache() { _intrinsic_id_cache = 0; } 227 228 // Count of times method was exited via exception while interpreting 229 void interpreter_throwout_increment() { 230 if (_interpreter_throwout_count < 65534) { 231 _interpreter_throwout_count++; 232 } 233 } 234 235 int interpreter_throwout_count() const { return _interpreter_throwout_count; } 236 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } 237 238 // size of parameters 239 int size_of_parameters() const { return _size_of_parameters; } 240 241 bool has_stackmap_table() const { 242 return constMethod()->has_stackmap_table(); 243 } 244 245 typeArrayOop stackmap_data() const { 246 return constMethod()->stackmap_data(); 247 } 248 249 // exception handler table 250 typeArrayOop exception_table() const 251 { return constMethod()->exception_table(); } 252 void set_exception_table(typeArrayOop e) 253 { constMethod()->set_exception_table(e); } 254 bool has_exception_handler() const 255 { return constMethod()->has_exception_handler(); } 256 257 // Finds the first entry point bci of an exception handler for an 258 // exception of klass ex_klass thrown at throw_bci. A value of NULL 259 // for ex_klass indicates that the exception klass is not known; in 260 // this case it matches any constraint class. Returns -1 if the 261 // exception cannot be handled in this method. The handler 262 // constraint classes are loaded if necessary. Note that this may 263 // throw an exception if loading of the constraint classes causes 264 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 265 // If an exception is thrown, returns the bci of the 266 // exception handler which caused the exception to be thrown, which 267 // is needed for proper retries. See, for example, 268 // InterpreterRuntime::exception_handler_for_exception. 269 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); 270 271 // method data access 272 methodDataOop method_data() const { 273 return _method_data; 274 } 275 void set_method_data(methodDataOop data) { 276 oop_store_without_check((oop*)&_method_data, (oop)data); 277 } 278 279 // invocation counter 280 InvocationCounter* invocation_counter() { return &_invocation_counter; } 281 InvocationCounter* backedge_counter() { return &_backedge_counter; } 282 int invocation_count() const { return _invocation_counter.count(); } 283 int backedge_count() const { return _backedge_counter.count(); } 284 bool was_executed_more_than(int n) const; 285 bool was_never_executed() const { return !was_executed_more_than(0); } 286 287 static void build_interpreter_method_data(methodHandle method, TRAPS); 288 289 int interpreter_invocation_count() const { return _interpreter_invocation_count; } 290 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } 291 int increment_interpreter_invocation_count() { return ++_interpreter_invocation_count; } 292 293 #ifndef PRODUCT 294 int compiled_invocation_count() const { return _compiled_invocation_count; } 295 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 296 #endif // not PRODUCT 297 298 // Clear (non-shared space) pointers which could not be relevent 299 // if this (shared) method were mapped into another JVM. 300 void remove_unshareable_info(); 301 302 // nmethod/verified compiler entry 303 address verified_code_entry(); 304 bool check_code() const; // Not inline to avoid circular ref 305 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 306 void clear_code(); // Clear out any compiled code 307 void set_code(methodHandle mh, nmethod* code); 308 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 309 address get_i2c_entry(); 310 address get_c2i_entry(); 311 address get_c2i_unverified_entry(); 312 AdapterHandlerEntry* adapter() { return _adapter; } 313 // setup entry points 314 void link_method(methodHandle method, TRAPS); 315 // clear entry points. Used by sharing code 316 void unlink_method(); 317 318 // vtable index 319 enum VtableIndexFlag { 320 // Valid vtable indexes are non-negative (>= 0). 321 // These few negative values are used as sentinels. 322 invalid_vtable_index = -4, // distinct from any valid vtable index 323 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 324 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 325 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 326 }; 327 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 328 int vtable_index() const { assert(valid_vtable_index(), ""); 329 return _vtable_index; } 330 void set_vtable_index(int index) { _vtable_index = index; } 331 332 // interpreter entry 333 address interpreter_entry() const { return _i2i_entry; } 334 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 335 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 336 int interpreter_kind(void) { 337 return constMethod()->interpreter_kind(); 338 } 339 void set_interpreter_kind(); 340 void set_interpreter_kind(int kind) { 341 constMethod()->set_interpreter_kind(kind); 342 } 343 344 // native function (used for native methods only) 345 enum { 346 native_bind_event_is_interesting = true 347 }; 348 address native_function() const { return *(native_function_addr()); } 349 // Must specify a real function (not NULL). 350 // Use clear_native_function() to unregister. 351 void set_native_function(address function, bool post_event_flag); 352 bool has_native_function() const; 353 void clear_native_function(); 354 355 // signature handler (used for native methods only) 356 address signature_handler() const { return *(signature_handler_addr()); } 357 void set_signature_handler(address handler); 358 359 // Interpreter oopmap support 360 void mask_for(int bci, InterpreterOopMap* mask); 361 362 #ifndef PRODUCT 363 // operations on invocation counter 364 void print_invocation_count() const; 365 #endif 366 367 // byte codes 368 address code_base() const { return constMethod()->code_base(); } 369 bool contains(address bcp) const { return constMethod()->contains(bcp); } 370 371 // prints byte codes 372 void print_codes() const { print_codes_on(tty); } 373 void print_codes_on(outputStream* st) const PRODUCT_RETURN; 374 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; 375 376 // checked exceptions 377 int checked_exceptions_length() const 378 { return constMethod()->checked_exceptions_length(); } 379 CheckedExceptionElement* checked_exceptions_start() const 380 { return constMethod()->checked_exceptions_start(); } 381 382 // localvariable table 383 bool has_localvariable_table() const 384 { return constMethod()->has_localvariable_table(); } 385 int localvariable_table_length() const 386 { return constMethod()->localvariable_table_length(); } 387 LocalVariableTableElement* localvariable_table_start() const 388 { return constMethod()->localvariable_table_start(); } 389 390 bool has_linenumber_table() const 391 { return constMethod()->has_linenumber_table(); } 392 u_char* compressed_linenumber_table() const 393 { return constMethod()->compressed_linenumber_table(); } 394 395 // method holder (the klassOop holding this method) 396 klassOop method_holder() const { return _constants->pool_holder(); } 397 398 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 399 symbolOop klass_name() const; // returns the name of the method holder 400 BasicType result_type() const; // type of the method result 401 int result_type_index() const; // type index of the method result 402 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 403 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 404 405 // Checked exceptions thrown by this method (resolved to mirrors) 406 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 407 408 // Access flags 409 bool is_public() const { return access_flags().is_public(); } 410 bool is_private() const { return access_flags().is_private(); } 411 bool is_protected() const { return access_flags().is_protected(); } 412 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 413 bool is_static() const { return access_flags().is_static(); } 414 bool is_final() const { return access_flags().is_final(); } 415 bool is_synchronized() const { return access_flags().is_synchronized();} 416 bool is_native() const { return access_flags().is_native(); } 417 bool is_abstract() const { return access_flags().is_abstract(); } 418 bool is_strict() const { return access_flags().is_strict(); } 419 bool is_synthetic() const { return access_flags().is_synthetic(); } 420 421 // returns true if contains only return operation 422 bool is_empty_method() const; 423 424 // returns true if this is a vanilla constructor 425 bool is_vanilla_constructor() const; 426 427 // checks method and its method holder 428 bool is_final_method() const; 429 bool is_strict_method() const; 430 431 // true if method needs no dynamic dispatch (final and/or no vtable entry) 432 bool can_be_statically_bound() const; 433 434 // returns true if the method has any backward branches. 435 bool has_loops() { 436 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 437 }; 438 439 bool compute_has_loops_flag(); 440 441 bool has_jsrs() { 442 return access_flags().has_jsrs(); 443 }; 444 void set_has_jsrs() { 445 _access_flags.set_has_jsrs(); 446 } 447 448 // returns true if the method has any monitors. 449 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 450 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 451 452 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 453 454 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 455 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 456 // has not been computed yet. 457 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 458 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 459 460 // returns true if the method is an accessor function (setter/getter). 461 bool is_accessor() const; 462 463 // returns true if the method is an initializer (<init> or <clinit>). 464 bool is_initializer() const; 465 466 // compiled code support 467 // NOTE: code() is inherently racy as deopt can be clearing code 468 // simultaneously. Use with caution. 469 bool has_compiled_code() const { return code() != NULL; } 470 471 // sizing 472 static int object_size(bool is_native); 473 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; } 474 int object_size() const { return method_size(); } 475 476 bool object_is_parsable() const { return method_size() > 0; } 477 478 // interpreter support 479 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); } 480 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); } 481 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); } 482 #ifdef CC_INTERP 483 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); } 484 #endif /* CC_INTERP */ 485 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); } 486 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); } 487 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); } 488 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); } 489 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); } 490 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); } 491 static ByteSize method_data_offset() { 492 return byte_offset_of(methodOopDesc, _method_data); 493 } 494 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); } 495 #ifndef PRODUCT 496 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); } 497 #endif // not PRODUCT 498 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); } 499 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); } 500 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); } 501 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); } 502 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); } 503 504 // for code generation 505 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); } 506 static int interpreter_invocation_counter_offset_in_bytes() 507 { return offset_of(methodOopDesc, _interpreter_invocation_count); } 508 509 // Static methods that are used to implement member methods where an exposed this pointer 510 // is needed due to possible GCs 511 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS); 512 513 // Returns the byte code index from the byte code pointer 514 int bci_from(address bcp) const; 515 address bcp_from(int bci) const; 516 int validate_bci_from_bcx(intptr_t bcx) const; 517 518 // Returns the line number for a bci if debugging information for the method is prowided, 519 // -1 is returned otherwise. 520 int line_number_from_bci(int bci) const; 521 522 // Reflection support 523 bool is_overridden_in(klassOop k) const; 524 525 // RedefineClasses() support: 526 bool is_old() const { return access_flags().is_old(); } 527 void set_is_old() { _access_flags.set_is_old(); } 528 bool is_obsolete() const { return access_flags().is_obsolete(); } 529 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 530 // see the definition in methodOop.cpp for the gory details 531 bool should_not_be_cached() const; 532 533 // JVMTI Native method prefixing support: 534 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 535 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 536 537 // Rewriting support 538 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 539 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 540 541 // Get this method's jmethodID -- allocate if it doesn't exist 542 jmethodID jmethod_id() { methodHandle this_h(this); 543 return instanceKlass::jmethod_id_for_impl(method_holder(), this_h); } 544 545 // Lookup the jmethodID for this method. Return NULL if not found. 546 // NOTE that this function can be called from a signal handler 547 // (see AsyncGetCallTrace support for Forte Analyzer) and this 548 // needs to be async-safe. No allocation should be done and 549 // so handles are not used to avoid deadlock. 550 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); } 551 552 // JNI static invoke cached itable index accessors 553 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } 554 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } 555 556 // Support for inlining of intrinsic methods 557 vmIntrinsics::ID intrinsic_id() const { // returns zero if not an intrinsic 558 const u1& cache = _intrinsic_id_cache; 559 if (cache != 0) { 560 return (vmIntrinsics::ID)(cache - 1); 561 } else { 562 vmIntrinsics::ID id = compute_intrinsic_id(); 563 *(u1*)&cache = ((u1) id) + 1; // force the cache to be non-const 564 vmIntrinsics::verify_method(id, (methodOop) this); 565 assert((vmIntrinsics::ID)(cache - 1) == id, "proper conversion"); 566 return id; 567 } 568 } 569 570 // On-stack replacement support 571 bool has_osr_nmethod() { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci) != NULL; } 572 nmethod* lookup_osr_nmethod_for(int bci) { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci); } 573 574 // Inline cache support 575 void cleanup_inline_caches(); 576 577 // Find if klass for method is loaded 578 bool is_klass_loaded_by_klass_index(int klass_index) const; 579 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 580 581 // Indicates whether compilation failed earlier for this method, or 582 // whether it is not compilable for another reason like having a 583 // breakpoint set in it. 584 bool is_not_compilable(int comp_level = CompLevel_highest_tier) const; 585 void set_not_compilable(int comp_level = CompLevel_highest_tier); 586 587 bool is_not_osr_compilable() const { return is_not_compilable() || access_flags().is_not_osr_compilable(); } 588 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); } 589 590 bool is_not_tier1_compilable() const { return access_flags().is_not_tier1_compilable(); } 591 void set_not_tier1_compilable() { _access_flags.set_not_tier1_compilable(); } 592 593 // Background compilation support 594 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 595 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 596 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 597 598 static methodOop method_from_bcp(address bcp); 599 600 // Resolve all classes in signature, return 'true' if successful 601 static bool load_signature_classes(methodHandle m, TRAPS); 602 603 // Return if true if not all classes references in signature, including return type, has been loaded 604 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 605 606 // Printing 607 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM 608 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)" 609 610 // Helper routine used for method sorting 611 static void sort_methods(objArrayOop methods, 612 objArrayOop methods_annotations, 613 objArrayOop methods_parameter_annotations, 614 objArrayOop methods_default_annotations, 615 bool idempotent = false); 616 617 // size of parameters 618 void set_size_of_parameters(int size) { _size_of_parameters = size; } 619 private: 620 621 // Helper routine for intrinsic_id(). 622 vmIntrinsics::ID compute_intrinsic_id() const; 623 624 // Inlined elements 625 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 626 address* signature_handler_addr() const { return native_function_addr() + 1; } 627 628 // Garbage collection support 629 oop* adr_constMethod() const { return (oop*)&_constMethod; } 630 oop* adr_constants() const { return (oop*)&_constants; } 631 oop* adr_method_data() const { return (oop*)&_method_data; } 632 }; 633 634 635 // Utility class for compressing line number tables 636 637 class CompressedLineNumberWriteStream: public CompressedWriteStream { 638 private: 639 int _bci; 640 int _line; 641 public: 642 // Constructor 643 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 644 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 645 646 // Write (bci, line number) pair to stream 647 void write_pair_regular(int bci_delta, int line_delta); 648 649 inline void write_pair_inline(int bci, int line) { 650 int bci_delta = bci - _bci; 651 int line_delta = line - _line; 652 _bci = bci; 653 _line = line; 654 // Skip (0,0) deltas - they do not add information and conflict with terminator. 655 if (bci_delta == 0 && line_delta == 0) return; 656 // Check if bci is 5-bit and line number 3-bit unsigned. 657 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 658 // Compress into single byte. 659 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 660 // Check that value doesn't match escape character. 661 if (value != 0xFF) { 662 write_byte(value); 663 return; 664 } 665 } 666 write_pair_regular(bci_delta, line_delta); 667 } 668 669 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 670 // Disabling optimization doesn't work for methods in header files 671 // so we force it to call through the non-optimized version in the .cpp. 672 // It's gross, but it's the only way we can ensure that all callers are 673 // fixed. MSC_VER is defined in build/windows/makefiles/compile.make. 674 #if defined(_M_AMD64) && MSC_VER >= 1400 675 void write_pair(int bci, int line); 676 #else 677 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 678 #endif 679 680 // Write end-of-stream marker 681 void write_terminator() { write_byte(0); } 682 }; 683 684 685 // Utility class for decompressing line number tables 686 687 class CompressedLineNumberReadStream: public CompressedReadStream { 688 private: 689 int _bci; 690 int _line; 691 public: 692 // Constructor 693 CompressedLineNumberReadStream(u_char* buffer); 694 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 695 bool read_pair(); 696 // Accessing bci and line number (after calling read_pair) 697 int bci() const { return _bci; } 698 int line() const { return _line; } 699 }; 700 701 702 /// Fast Breakpoints. 703 704 // If this structure gets more complicated (because bpts get numerous), 705 // move it into its own header. 706 707 // There is presently no provision for concurrent access 708 // to breakpoint lists, which is only OK for JVMTI because 709 // breakpoints are written only at safepoints, and are read 710 // concurrently only outside of safepoints. 711 712 class BreakpointInfo : public CHeapObj { 713 friend class VMStructs; 714 private: 715 Bytecodes::Code _orig_bytecode; 716 int _bci; 717 u2 _name_index; // of method 718 u2 _signature_index; // of method 719 BreakpointInfo* _next; // simple storage allocation 720 721 public: 722 BreakpointInfo(methodOop m, int bci); 723 724 // accessors 725 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 726 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 727 int bci() { return _bci; } 728 729 BreakpointInfo* next() const { return _next; } 730 void set_next(BreakpointInfo* n) { _next = n; } 731 732 // helps for searchers 733 bool match(methodOop m, int bci) { 734 return bci == _bci && match(m); 735 } 736 737 bool match(methodOop m) { 738 return _name_index == m->name_index() && 739 _signature_index == m->signature_index(); 740 } 741 742 void set(methodOop method); 743 void clear(methodOop method); 744 }; 745 746