1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 // A methodOop represents a Java method. 26 // 27 // Memory layout (each line represents a word). Note that most applications load thousands of methods, 28 // so keeping the size of this structure small has a big impact on footprint. 29 // 30 // We put all oops and method_size first for better gc cache locality. 31 // 32 // The actual bytecodes are inlined after the end of the methodOopDesc struct. 33 // 34 // There are bits in the access_flags telling whether inlined tables are present. 35 // Note that accessing the line number and local variable tables is not performance critical at all. 36 // Accessing the checked exceptions table is used by reflection, so we put that last to make access 37 // to it fast. 38 // 39 // The line number table is compressed and inlined following the byte codes. It is found as the first 40 // byte following the byte codes. The checked exceptions table and the local variable table are inlined 41 // after the line number table, and indexed from the end of the method. We do not compress the checked 42 // exceptions table since the average length is less than 2, and do not bother to compress the local 43 // variable table either since it is mostly absent. 44 // 45 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter) 46 // 47 // |------------------------------------------------------| 48 // | header | 49 // | klass | 50 // |------------------------------------------------------| 51 // | constMethodOop (oop) | 52 // | constants (oop) | 53 // |------------------------------------------------------| 54 // | methodData (oop) | 55 // | interp_invocation_count | 56 // |------------------------------------------------------| 57 // | access_flags | 58 // | vtable_index | 59 // |------------------------------------------------------| 60 // | result_index (C++ interpreter only) | 61 // |------------------------------------------------------| 62 // | method_size | max_stack | 63 // | max_locals | size_of_parameters | 64 // |------------------------------------------------------| 65 // | intrinsic_id, highest_tier | (unused) | 66 // |------------------------------------------------------| 67 // | throwout_count | num_breakpoints | 68 // |------------------------------------------------------| 69 // | invocation_counter | 70 // | backedge_counter | 71 // |------------------------------------------------------| 72 // | code (pointer) | 73 // | i2i (pointer) | 74 // | adapter (pointer) | 75 // | from_compiled_entry (pointer) | 76 // | from_interpreted_entry (pointer) | 77 // |------------------------------------------------------| 78 // | native_function (present only if native) | 79 // | signature_handler (present only if native) | 80 // |------------------------------------------------------| 81 82 83 class CheckedExceptionElement; 84 class LocalVariableTableElement; 85 class AdapterHandlerEntry; 86 87 class methodDataOopDesc; 88 89 class methodOopDesc : public oopDesc { 90 friend class methodKlass; 91 friend class VMStructs; 92 private: 93 constMethodOop _constMethod; // Method read-only data. 94 constantPoolOop _constants; // Constant pool 95 methodDataOop _method_data; 96 int _interpreter_invocation_count; // Count of times invoked 97 AccessFlags _access_flags; // Access flags 98 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 99 // note: can have vtables with >2**16 elements (because of inheritance) 100 #ifdef CC_INTERP 101 int _result_index; // C++ interpreter needs for converting results to/from stack 102 #endif 103 u2 _method_size; // size of this object 104 u2 _max_stack; // Maximum number of entries on the expression stack 105 u2 _max_locals; // Number of local variables used by this method 106 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words 107 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 108 u1 _highest_tier_compile; // Highest compile level this method has ever seen. 109 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 110 u2 _number_of_breakpoints; // fullspeed debugging support 111 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 112 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 113 #ifndef PRODUCT 114 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 115 #endif 116 // Entry point for calling both from and to the interpreter. 117 address _i2i_entry; // All-args-on-stack calling convention 118 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked. 119 AdapterHandlerEntry* _adapter; 120 // Entry point for calling from compiled code, to compiled code if it exists 121 // or else the interpreter. 122 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 123 // The entry point for calling both from and to compiled code is 124 // "_code->entry_point()". Because of tiered compilation and de-opt, this 125 // field can come and go. It can transition from NULL to not-null at any 126 // time (whenever a compile completes). It can transition from not-null to 127 // NULL only at safepoints (because of a de-opt). 128 nmethod* volatile _code; // Points to the corresponding piece of native code 129 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 130 131 public: 132 133 static const bool IsUnsafeConc = false; 134 static const bool IsSafeConc = true; 135 136 // accessors for instance variables 137 constMethodOop constMethod() const { return _constMethod; } 138 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); } 139 140 141 static address make_adapters(methodHandle mh, TRAPS); 142 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 143 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 144 145 // access flag 146 AccessFlags access_flags() const { return _access_flags; } 147 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 148 149 // name 150 symbolOop name() const { return _constants->symbol_at(name_index()); } 151 int name_index() const { return constMethod()->name_index(); } 152 void set_name_index(int index) { constMethod()->set_name_index(index); } 153 154 // signature 155 symbolOop signature() const { return _constants->symbol_at(signature_index()); } 156 int signature_index() const { return constMethod()->signature_index(); } 157 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 158 159 // generics support 160 symbolOop generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); } 161 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 162 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 163 164 // annotations support 165 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); } 166 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); } 167 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); } 168 169 #ifdef CC_INTERP 170 void set_result_index(BasicType type); 171 int result_index() { return _result_index; } 172 #endif 173 174 // Helper routine: get klass name + "." + method name + signature as 175 // C string, for the purpose of providing more useful NoSuchMethodErrors 176 // and fatal error handling. The string is allocated in resource 177 // area if a buffer is not provided by the caller. 178 char* name_and_sig_as_C_string(); 179 char* name_and_sig_as_C_string(char* buf, int size); 180 181 // Static routine in the situations we don't have a methodOop 182 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature); 183 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size); 184 185 // JVMTI breakpoints 186 Bytecodes::Code orig_bytecode_at(int bci); 187 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 188 void set_breakpoint(int bci); 189 void clear_breakpoint(int bci); 190 void clear_all_breakpoints(); 191 // Tracking number of breakpoints, for fullspeed debugging. 192 // Only mutated by VM thread. 193 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 194 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 195 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 196 // Initialization only 197 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 198 199 // index into instanceKlass methods() array 200 u2 method_idnum() const { return constMethod()->method_idnum(); } 201 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 202 203 // code size 204 int code_size() const { return constMethod()->code_size(); } 205 206 // method size 207 int method_size() const { return _method_size; } 208 void set_method_size(int size) { 209 assert(0 <= size && size < (1 << 16), "invalid method size"); 210 _method_size = size; 211 } 212 213 // constant pool for klassOop holding this method 214 constantPoolOop constants() const { return _constants; } 215 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); } 216 217 // max stack 218 int max_stack() const { return _max_stack; } 219 void set_max_stack(int size) { _max_stack = size; } 220 221 // max locals 222 int max_locals() const { return _max_locals; } 223 void set_max_locals(int size) { _max_locals = size; } 224 int highest_tier_compile() { return _highest_tier_compile;} 225 void set_highest_tier_compile(int level) { _highest_tier_compile = level;} 226 227 // Count of times method was exited via exception while interpreting 228 void interpreter_throwout_increment() { 229 if (_interpreter_throwout_count < 65534) { 230 _interpreter_throwout_count++; 231 } 232 } 233 234 int interpreter_throwout_count() const { return _interpreter_throwout_count; } 235 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } 236 237 // size of parameters 238 int size_of_parameters() const { return _size_of_parameters; } 239 240 bool has_stackmap_table() const { 241 return constMethod()->has_stackmap_table(); 242 } 243 244 typeArrayOop stackmap_data() const { 245 return constMethod()->stackmap_data(); 246 } 247 248 // exception handler table 249 typeArrayOop exception_table() const 250 { return constMethod()->exception_table(); } 251 void set_exception_table(typeArrayOop e) 252 { constMethod()->set_exception_table(e); } 253 bool has_exception_handler() const 254 { return constMethod()->has_exception_handler(); } 255 256 // Finds the first entry point bci of an exception handler for an 257 // exception of klass ex_klass thrown at throw_bci. A value of NULL 258 // for ex_klass indicates that the exception klass is not known; in 259 // this case it matches any constraint class. Returns -1 if the 260 // exception cannot be handled in this method. The handler 261 // constraint classes are loaded if necessary. Note that this may 262 // throw an exception if loading of the constraint classes causes 263 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 264 // If an exception is thrown, returns the bci of the 265 // exception handler which caused the exception to be thrown, which 266 // is needed for proper retries. See, for example, 267 // InterpreterRuntime::exception_handler_for_exception. 268 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); 269 270 // method data access 271 methodDataOop method_data() const { 272 return _method_data; 273 } 274 void set_method_data(methodDataOop data) { 275 oop_store_without_check((oop*)&_method_data, (oop)data); 276 } 277 278 // invocation counter 279 InvocationCounter* invocation_counter() { return &_invocation_counter; } 280 InvocationCounter* backedge_counter() { return &_backedge_counter; } 281 int invocation_count() const { return _invocation_counter.count(); } 282 int backedge_count() const { return _backedge_counter.count(); } 283 bool was_executed_more_than(int n) const; 284 bool was_never_executed() const { return !was_executed_more_than(0); } 285 286 static void build_interpreter_method_data(methodHandle method, TRAPS); 287 288 int interpreter_invocation_count() const { return _interpreter_invocation_count; } 289 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } 290 int increment_interpreter_invocation_count() { return ++_interpreter_invocation_count; } 291 292 #ifndef PRODUCT 293 int compiled_invocation_count() const { return _compiled_invocation_count; } 294 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 295 #endif // not PRODUCT 296 297 // Clear (non-shared space) pointers which could not be relevant 298 // if this (shared) method were mapped into another JVM. 299 void remove_unshareable_info(); 300 301 // nmethod/verified compiler entry 302 address verified_code_entry(); 303 bool check_code() const; // Not inline to avoid circular ref 304 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 305 void clear_code(); // Clear out any compiled code 306 void set_code(methodHandle mh, nmethod* code); 307 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 308 address get_i2c_entry(); 309 address get_c2i_entry(); 310 address get_c2i_unverified_entry(); 311 AdapterHandlerEntry* adapter() { return _adapter; } 312 // setup entry points 313 void link_method(methodHandle method, TRAPS); 314 // clear entry points. Used by sharing code 315 void unlink_method(); 316 317 // vtable index 318 enum VtableIndexFlag { 319 // Valid vtable indexes are non-negative (>= 0). 320 // These few negative values are used as sentinels. 321 highest_unused_vtable_index_value = -5, 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 // JSR 292 support 526 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); } 527 static methodHandle make_invoke_method(KlassHandle holder, 528 symbolHandle signature, 529 Handle method_type, 530 TRAPS); 531 // these operate only on invoke methods: 532 oop method_handle_type() const; 533 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1 534 // presize interpreter frames for extra interpreter stack entries, if needed 535 // method handles want to be able to push a few extra values (e.g., a bound receiver), and 536 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, 537 // all without checking for a stack overflow 538 static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); } 539 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize() 540 // RedefineClasses() support: 541 bool is_old() const { return access_flags().is_old(); } 542 void set_is_old() { _access_flags.set_is_old(); } 543 bool is_obsolete() const { return access_flags().is_obsolete(); } 544 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 545 // see the definition in methodOop.cpp for the gory details 546 bool should_not_be_cached() const; 547 548 // JVMTI Native method prefixing support: 549 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 550 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 551 552 // Rewriting support 553 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 554 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 555 556 // Get this method's jmethodID -- allocate if it doesn't exist 557 jmethodID jmethod_id() { methodHandle this_h(this); 558 return instanceKlass::get_jmethod_id(method_holder(), this_h); } 559 560 // Lookup the jmethodID for this method. Return NULL if not found. 561 // NOTE that this function can be called from a signal handler 562 // (see AsyncGetCallTrace support for Forte Analyzer) and this 563 // needs to be async-safe. No allocation should be done and 564 // so handles are not used to avoid deadlock. 565 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); } 566 567 // JNI static invoke cached itable index accessors 568 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } 569 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } 570 571 // Support for inlining of intrinsic methods 572 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 573 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 574 575 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 576 void init_intrinsic_id(); // updates from _none if a match 577 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder); 578 579 // On-stack replacement support 580 bool has_osr_nmethod() { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci) != NULL; } 581 nmethod* lookup_osr_nmethod_for(int bci) { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci); } 582 583 // Inline cache support 584 void cleanup_inline_caches(); 585 586 // Find if klass for method is loaded 587 bool is_klass_loaded_by_klass_index(int klass_index) const; 588 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 589 590 // Indicates whether compilation failed earlier for this method, or 591 // whether it is not compilable for another reason like having a 592 // breakpoint set in it. 593 bool is_not_compilable(int comp_level = CompLevel_highest_tier) const; 594 void set_not_compilable(int comp_level = CompLevel_highest_tier); 595 596 bool is_not_osr_compilable() const { return is_not_compilable() || access_flags().is_not_osr_compilable(); } 597 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); } 598 599 bool is_not_tier1_compilable() const { return access_flags().is_not_tier1_compilable(); } 600 void set_not_tier1_compilable() { _access_flags.set_not_tier1_compilable(); } 601 602 // Background compilation support 603 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 604 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 605 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 606 607 static methodOop method_from_bcp(address bcp); 608 609 // Resolve all classes in signature, return 'true' if successful 610 static bool load_signature_classes(methodHandle m, TRAPS); 611 612 // Return if true if not all classes references in signature, including return type, has been loaded 613 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 614 615 // Printing 616 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM 617 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)" 618 619 // Helper routine used for method sorting 620 static void sort_methods(objArrayOop methods, 621 objArrayOop methods_annotations, 622 objArrayOop methods_parameter_annotations, 623 objArrayOop methods_default_annotations, 624 bool idempotent = false); 625 626 // size of parameters 627 void set_size_of_parameters(int size) { _size_of_parameters = size; } 628 private: 629 630 // Inlined elements 631 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 632 address* signature_handler_addr() const { return native_function_addr() + 1; } 633 634 // Garbage collection support 635 oop* adr_constMethod() const { return (oop*)&_constMethod; } 636 oop* adr_constants() const { return (oop*)&_constants; } 637 oop* adr_method_data() const { return (oop*)&_method_data; } 638 }; 639 640 641 // Utility class for compressing line number tables 642 643 class CompressedLineNumberWriteStream: public CompressedWriteStream { 644 private: 645 int _bci; 646 int _line; 647 public: 648 // Constructor 649 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 650 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 651 652 // Write (bci, line number) pair to stream 653 void write_pair_regular(int bci_delta, int line_delta); 654 655 inline void write_pair_inline(int bci, int line) { 656 int bci_delta = bci - _bci; 657 int line_delta = line - _line; 658 _bci = bci; 659 _line = line; 660 // Skip (0,0) deltas - they do not add information and conflict with terminator. 661 if (bci_delta == 0 && line_delta == 0) return; 662 // Check if bci is 5-bit and line number 3-bit unsigned. 663 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 664 // Compress into single byte. 665 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 666 // Check that value doesn't match escape character. 667 if (value != 0xFF) { 668 write_byte(value); 669 return; 670 } 671 } 672 write_pair_regular(bci_delta, line_delta); 673 } 674 675 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 676 // Disabling optimization doesn't work for methods in header files 677 // so we force it to call through the non-optimized version in the .cpp. 678 // It's gross, but it's the only way we can ensure that all callers are 679 // fixed. MSC_VER is defined in build/windows/makefiles/compile.make. 680 #if defined(_M_AMD64) && MSC_VER >= 1400 681 void write_pair(int bci, int line); 682 #else 683 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 684 #endif 685 686 // Write end-of-stream marker 687 void write_terminator() { write_byte(0); } 688 }; 689 690 691 // Utility class for decompressing line number tables 692 693 class CompressedLineNumberReadStream: public CompressedReadStream { 694 private: 695 int _bci; 696 int _line; 697 public: 698 // Constructor 699 CompressedLineNumberReadStream(u_char* buffer); 700 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 701 bool read_pair(); 702 // Accessing bci and line number (after calling read_pair) 703 int bci() const { return _bci; } 704 int line() const { return _line; } 705 }; 706 707 708 /// Fast Breakpoints. 709 710 // If this structure gets more complicated (because bpts get numerous), 711 // move it into its own header. 712 713 // There is presently no provision for concurrent access 714 // to breakpoint lists, which is only OK for JVMTI because 715 // breakpoints are written only at safepoints, and are read 716 // concurrently only outside of safepoints. 717 718 class BreakpointInfo : public CHeapObj { 719 friend class VMStructs; 720 private: 721 Bytecodes::Code _orig_bytecode; 722 int _bci; 723 u2 _name_index; // of method 724 u2 _signature_index; // of method 725 BreakpointInfo* _next; // simple storage allocation 726 727 public: 728 BreakpointInfo(methodOop m, int bci); 729 730 // accessors 731 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 732 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 733 int bci() { return _bci; } 734 735 BreakpointInfo* next() const { return _next; } 736 void set_next(BreakpointInfo* n) { _next = n; } 737 738 // helps for searchers 739 bool match(methodOop m, int bci) { 740 return bci == _bci && match(m); 741 } 742 743 bool match(methodOop m) { 744 return _name_index == m->name_index() && 745 _signature_index == m->signature_index(); 746 } 747 748 void set(methodOop method); 749 void clear(methodOop method); 750 };