rev 1083 : code cache unloading for webrev 091214
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 nmethod* volatile _saved_code; // remember nmethod while we attempt to clear code cache space 130 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 131 132 public: 133 134 static const bool IsUnsafeConc = false; 135 static const bool IsSafeConc = true; 136 137 // accessors for instance variables 138 constMethodOop constMethod() const { return _constMethod; } 139 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); } 140 141 142 static address make_adapters(methodHandle mh, TRAPS); 143 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 144 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 145 146 // access flag 147 AccessFlags access_flags() const { return _access_flags; } 148 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 149 150 // name 151 symbolOop name() const { return _constants->symbol_at(name_index()); } 152 int name_index() const { return constMethod()->name_index(); } 153 void set_name_index(int index) { constMethod()->set_name_index(index); } 154 155 // signature 156 symbolOop signature() const { return _constants->symbol_at(signature_index()); } 157 int signature_index() const { return constMethod()->signature_index(); } 158 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 159 160 // generics support 161 symbolOop generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); } 162 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 163 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 164 165 // annotations support 166 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); } 167 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); } 168 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); } 169 170 #ifdef CC_INTERP 171 void set_result_index(BasicType type); 172 int result_index() { return _result_index; } 173 #endif 174 175 // Helper routine: get klass name + "." + method name + signature as 176 // C string, for the purpose of providing more useful NoSuchMethodErrors 177 // and fatal error handling. The string is allocated in resource 178 // area if a buffer is not provided by the caller. 179 char* name_and_sig_as_C_string(); 180 char* name_and_sig_as_C_string(char* buf, int size); 181 182 // Static routine in the situations we don't have a methodOop 183 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature); 184 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size); 185 186 // JVMTI breakpoints 187 Bytecodes::Code orig_bytecode_at(int bci); 188 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 189 void set_breakpoint(int bci); 190 void clear_breakpoint(int bci); 191 void clear_all_breakpoints(); 192 // Tracking number of breakpoints, for fullspeed debugging. 193 // Only mutated by VM thread. 194 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 195 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 196 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 197 // Initialization only 198 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 199 200 // index into instanceKlass methods() array 201 u2 method_idnum() const { return constMethod()->method_idnum(); } 202 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 203 204 // code size 205 int code_size() const { return constMethod()->code_size(); } 206 207 // method size 208 int method_size() const { return _method_size; } 209 void set_method_size(int size) { 210 assert(0 <= size && size < (1 << 16), "invalid method size"); 211 _method_size = size; 212 } 213 214 // constant pool for klassOop holding this method 215 constantPoolOop constants() const { return _constants; } 216 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); } 217 218 // max stack 219 int max_stack() const { return _max_stack; } 220 void set_max_stack(int size) { _max_stack = size; } 221 222 // max locals 223 int max_locals() const { return _max_locals; } 224 void set_max_locals(int size) { _max_locals = size; } 225 int highest_tier_compile() { return _highest_tier_compile;} 226 void set_highest_tier_compile(int level) { _highest_tier_compile = level;} 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 relevant 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 nmethod* saved_code() const { return _saved_code; } 307 void set_saved_code(nmethod* code) { _saved_code = code; } 308 void clear_code(); // Clear out any compiled code 309 void clear_code_hedge(); // Clear out any compiled code and save code ptr in attempt to clean up code cache 310 void set_code(methodHandle mh, nmethod* code); 311 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 312 address get_i2c_entry(); 313 address get_c2i_entry(); 314 address get_c2i_unverified_entry(); 315 AdapterHandlerEntry* adapter() { return _adapter; } 316 // setup entry points 317 void link_method(methodHandle method, TRAPS); 318 // clear entry points. Used by sharing code 319 void unlink_method(); 320 321 // vtable index 322 enum VtableIndexFlag { 323 // Valid vtable indexes are non-negative (>= 0). 324 // These few negative values are used as sentinels. 325 highest_unused_vtable_index_value = -5, 326 invalid_vtable_index = -4, // distinct from any valid vtable index 327 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 328 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 329 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 330 }; 331 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 332 int vtable_index() const { assert(valid_vtable_index(), ""); 333 return _vtable_index; } 334 void set_vtable_index(int index) { _vtable_index = index; } 335 336 // interpreter entry 337 address interpreter_entry() const { return _i2i_entry; } 338 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 339 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 340 int interpreter_kind(void) { 341 return constMethod()->interpreter_kind(); 342 } 343 void set_interpreter_kind(); 344 void set_interpreter_kind(int kind) { 345 constMethod()->set_interpreter_kind(kind); 346 } 347 348 // native function (used for native methods only) 349 enum { 350 native_bind_event_is_interesting = true 351 }; 352 address native_function() const { return *(native_function_addr()); } 353 // Must specify a real function (not NULL). 354 // Use clear_native_function() to unregister. 355 void set_native_function(address function, bool post_event_flag); 356 bool has_native_function() const; 357 void clear_native_function(); 358 359 // signature handler (used for native methods only) 360 address signature_handler() const { return *(signature_handler_addr()); } 361 void set_signature_handler(address handler); 362 363 // Interpreter oopmap support 364 void mask_for(int bci, InterpreterOopMap* mask); 365 366 #ifndef PRODUCT 367 // operations on invocation counter 368 void print_invocation_count() const; 369 #endif 370 371 // byte codes 372 address code_base() const { return constMethod()->code_base(); } 373 bool contains(address bcp) const { return constMethod()->contains(bcp); } 374 375 // prints byte codes 376 void print_codes() const { print_codes_on(tty); } 377 void print_codes_on(outputStream* st) const PRODUCT_RETURN; 378 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; 379 380 // checked exceptions 381 int checked_exceptions_length() const 382 { return constMethod()->checked_exceptions_length(); } 383 CheckedExceptionElement* checked_exceptions_start() const 384 { return constMethod()->checked_exceptions_start(); } 385 386 // localvariable table 387 bool has_localvariable_table() const 388 { return constMethod()->has_localvariable_table(); } 389 int localvariable_table_length() const 390 { return constMethod()->localvariable_table_length(); } 391 LocalVariableTableElement* localvariable_table_start() const 392 { return constMethod()->localvariable_table_start(); } 393 394 bool has_linenumber_table() const 395 { return constMethod()->has_linenumber_table(); } 396 u_char* compressed_linenumber_table() const 397 { return constMethod()->compressed_linenumber_table(); } 398 399 // method holder (the klassOop holding this method) 400 klassOop method_holder() const { return _constants->pool_holder(); } 401 402 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 403 symbolOop klass_name() const; // returns the name of the method holder 404 BasicType result_type() const; // type of the method result 405 int result_type_index() const; // type index of the method result 406 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 407 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 408 409 // Checked exceptions thrown by this method (resolved to mirrors) 410 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 411 412 // Access flags 413 bool is_public() const { return access_flags().is_public(); } 414 bool is_private() const { return access_flags().is_private(); } 415 bool is_protected() const { return access_flags().is_protected(); } 416 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 417 bool is_static() const { return access_flags().is_static(); } 418 bool is_final() const { return access_flags().is_final(); } 419 bool is_synchronized() const { return access_flags().is_synchronized();} 420 bool is_native() const { return access_flags().is_native(); } 421 bool is_abstract() const { return access_flags().is_abstract(); } 422 bool is_strict() const { return access_flags().is_strict(); } 423 bool is_synthetic() const { return access_flags().is_synthetic(); } 424 425 // returns true if contains only return operation 426 bool is_empty_method() const; 427 428 // returns true if this is a vanilla constructor 429 bool is_vanilla_constructor() const; 430 431 // checks method and its method holder 432 bool is_final_method() const; 433 bool is_strict_method() const; 434 435 // true if method needs no dynamic dispatch (final and/or no vtable entry) 436 bool can_be_statically_bound() const; 437 438 // returns true if the method has any backward branches. 439 bool has_loops() { 440 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 441 }; 442 443 bool compute_has_loops_flag(); 444 445 bool has_jsrs() { 446 return access_flags().has_jsrs(); 447 }; 448 void set_has_jsrs() { 449 _access_flags.set_has_jsrs(); 450 } 451 452 // returns true if the method has any monitors. 453 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 454 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 455 456 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 457 458 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 459 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 460 // has not been computed yet. 461 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 462 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 463 464 // returns true if the method is an accessor function (setter/getter). 465 bool is_accessor() const; 466 467 // returns true if the method is an initializer (<init> or <clinit>). 468 bool is_initializer() const; 469 470 // compiled code support 471 // NOTE: code() is inherently racy as deopt can be clearing code 472 // simultaneously. Use with caution. 473 bool has_compiled_code() const { return code() != NULL; } 474 475 // sizing 476 static int object_size(bool is_native); 477 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; } 478 int object_size() const { return method_size(); } 479 480 bool object_is_parsable() const { return method_size() > 0; } 481 482 // interpreter support 483 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); } 484 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); } 485 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); } 486 #ifdef CC_INTERP 487 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); } 488 #endif /* CC_INTERP */ 489 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); } 490 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); } 491 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); } 492 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); } 493 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); } 494 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); } 495 static ByteSize method_data_offset() { 496 return byte_offset_of(methodOopDesc, _method_data); 497 } 498 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); } 499 #ifndef PRODUCT 500 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); } 501 #endif // not PRODUCT 502 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); } 503 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); } 504 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); } 505 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); } 506 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); } 507 508 // for code generation 509 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); } 510 static int interpreter_invocation_counter_offset_in_bytes() 511 { return offset_of(methodOopDesc, _interpreter_invocation_count); } 512 513 // Static methods that are used to implement member methods where an exposed this pointer 514 // is needed due to possible GCs 515 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS); 516 517 // Returns the byte code index from the byte code pointer 518 int bci_from(address bcp) const; 519 address bcp_from(int bci) const; 520 int validate_bci_from_bcx(intptr_t bcx) const; 521 522 // Returns the line number for a bci if debugging information for the method is prowided, 523 // -1 is returned otherwise. 524 int line_number_from_bci(int bci) const; 525 526 // Reflection support 527 bool is_overridden_in(klassOop k) const; 528 529 // JSR 292 support 530 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); } 531 static methodHandle make_invoke_method(KlassHandle holder, 532 symbolHandle signature, 533 Handle method_type, 534 TRAPS); 535 // these operate only on invoke methods: 536 oop method_handle_type() const; 537 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1 538 // presize interpreter frames for extra interpreter stack entries, if needed 539 // method handles want to be able to push a few extra values (e.g., a bound receiver), and 540 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, 541 // all without checking for a stack overflow 542 static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); } 543 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize() 544 // RedefineClasses() support: 545 bool is_old() const { return access_flags().is_old(); } 546 void set_is_old() { _access_flags.set_is_old(); } 547 bool is_obsolete() const { return access_flags().is_obsolete(); } 548 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 549 // see the definition in methodOop.cpp for the gory details 550 bool should_not_be_cached() const; 551 552 // JVMTI Native method prefixing support: 553 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 554 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 555 556 // Rewriting support 557 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 558 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 559 560 // Get this method's jmethodID -- allocate if it doesn't exist 561 jmethodID jmethod_id() { methodHandle this_h(this); 562 return instanceKlass::get_jmethod_id(method_holder(), this_h); } 563 564 // Lookup the jmethodID for this method. Return NULL if not found. 565 // NOTE that this function can be called from a signal handler 566 // (see AsyncGetCallTrace support for Forte Analyzer) and this 567 // needs to be async-safe. No allocation should be done and 568 // so handles are not used to avoid deadlock. 569 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); } 570 571 // JNI static invoke cached itable index accessors 572 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } 573 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } 574 575 // Support for inlining of intrinsic methods 576 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 577 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 578 579 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 580 void init_intrinsic_id(); // updates from _none if a match 581 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder); 582 583 // On-stack replacement support 584 bool has_osr_nmethod() { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci) != NULL; } 585 nmethod* lookup_osr_nmethod_for(int bci) { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci); } 586 587 // Inline cache support 588 void cleanup_inline_caches(); 589 590 // Find if klass for method is loaded 591 bool is_klass_loaded_by_klass_index(int klass_index) const; 592 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 593 594 // Indicates whether compilation failed earlier for this method, or 595 // whether it is not compilable for another reason like having a 596 // breakpoint set in it. 597 bool is_not_compilable(int comp_level = CompLevel_highest_tier) const; 598 void set_not_compilable(int comp_level = CompLevel_highest_tier); 599 600 bool is_not_osr_compilable() const { return is_not_compilable() || access_flags().is_not_osr_compilable(); } 601 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); } 602 603 bool is_not_tier1_compilable() const { return access_flags().is_not_tier1_compilable(); } 604 void set_not_tier1_compilable() { _access_flags.set_not_tier1_compilable(); } 605 606 // Background compilation support 607 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 608 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 609 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 610 611 static methodOop method_from_bcp(address bcp); 612 613 // Resolve all classes in signature, return 'true' if successful 614 static bool load_signature_classes(methodHandle m, TRAPS); 615 616 // Return if true if not all classes references in signature, including return type, has been loaded 617 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 618 619 // Printing 620 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM 621 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)" 622 623 // Helper routine used for method sorting 624 static void sort_methods(objArrayOop methods, 625 objArrayOop methods_annotations, 626 objArrayOop methods_parameter_annotations, 627 objArrayOop methods_default_annotations, 628 bool idempotent = false); 629 630 // size of parameters 631 void set_size_of_parameters(int size) { _size_of_parameters = size; } 632 private: 633 634 // Inlined elements 635 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 636 address* signature_handler_addr() const { return native_function_addr() + 1; } 637 638 // Garbage collection support 639 oop* adr_constMethod() const { return (oop*)&_constMethod; } 640 oop* adr_constants() const { return (oop*)&_constants; } 641 oop* adr_method_data() const { return (oop*)&_method_data; } 642 }; 643 644 645 // Utility class for compressing line number tables 646 647 class CompressedLineNumberWriteStream: public CompressedWriteStream { 648 private: 649 int _bci; 650 int _line; 651 public: 652 // Constructor 653 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 654 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 655 656 // Write (bci, line number) pair to stream 657 void write_pair_regular(int bci_delta, int line_delta); 658 659 inline void write_pair_inline(int bci, int line) { 660 int bci_delta = bci - _bci; 661 int line_delta = line - _line; 662 _bci = bci; 663 _line = line; 664 // Skip (0,0) deltas - they do not add information and conflict with terminator. 665 if (bci_delta == 0 && line_delta == 0) return; 666 // Check if bci is 5-bit and line number 3-bit unsigned. 667 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 668 // Compress into single byte. 669 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 670 // Check that value doesn't match escape character. 671 if (value != 0xFF) { 672 write_byte(value); 673 return; 674 } 675 } 676 write_pair_regular(bci_delta, line_delta); 677 } 678 679 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 680 // Disabling optimization doesn't work for methods in header files 681 // so we force it to call through the non-optimized version in the .cpp. 682 // It's gross, but it's the only way we can ensure that all callers are 683 // fixed. MSC_VER is defined in build/windows/makefiles/compile.make. 684 #if defined(_M_AMD64) && MSC_VER >= 1400 685 void write_pair(int bci, int line); 686 #else 687 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 688 #endif 689 690 // Write end-of-stream marker 691 void write_terminator() { write_byte(0); } 692 }; 693 694 695 // Utility class for decompressing line number tables 696 697 class CompressedLineNumberReadStream: public CompressedReadStream { 698 private: 699 int _bci; 700 int _line; 701 public: 702 // Constructor 703 CompressedLineNumberReadStream(u_char* buffer); 704 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 705 bool read_pair(); 706 // Accessing bci and line number (after calling read_pair) 707 int bci() const { return _bci; } 708 int line() const { return _line; } 709 }; 710 711 712 /// Fast Breakpoints. 713 714 // If this structure gets more complicated (because bpts get numerous), 715 // move it into its own header. 716 717 // There is presently no provision for concurrent access 718 // to breakpoint lists, which is only OK for JVMTI because 719 // breakpoints are written only at safepoints, and are read 720 // concurrently only outside of safepoints. 721 722 class BreakpointInfo : public CHeapObj { 723 friend class VMStructs; 724 private: 725 Bytecodes::Code _orig_bytecode; 726 int _bci; 727 u2 _name_index; // of method 728 u2 _signature_index; // of method 729 BreakpointInfo* _next; // simple storage allocation 730 731 public: 732 BreakpointInfo(methodOop m, int bci); 733 734 // accessors 735 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 736 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 737 int bci() { return _bci; } 738 739 BreakpointInfo* next() const { return _next; } 740 void set_next(BreakpointInfo* n) { _next = n; } 741 742 // helps for searchers 743 bool match(methodOop m, int bci) { 744 return bci == _bci && match(m); 745 } 746 747 bool match(methodOop m) { 748 return _name_index == m->name_index() && 749 _signature_index == m->signature_index(); 750 } 751 752 void set(methodOop method); 753 void clear(methodOop method); 754 }; --- EOF ---