1 /* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP 26 #define SHARE_VM_OOPS_METHODOOP_HPP 27 28 #include "classfile/vmSymbols.hpp" 29 #include "code/compressedStream.hpp" 30 #include "compiler/oopMap.hpp" 31 #include "interpreter/invocationCounter.hpp" 32 #include "oops/constMethodOop.hpp" 33 #include "oops/constantPoolOop.hpp" 34 #include "oops/instanceKlass.hpp" 35 #include "oops/oop.hpp" 36 #include "oops/typeArrayOop.hpp" 37 #include "utilities/accessFlags.hpp" 38 #include "utilities/growableArray.hpp" 39 40 // A methodOop represents a Java method. 41 // 42 // Memory layout (each line represents a word). Note that most applications load thousands of methods, 43 // so keeping the size of this structure small has a big impact on footprint. 44 // 45 // We put all oops and method_size first for better gc cache locality. 46 // 47 // The actual bytecodes are inlined after the end of the methodOopDesc struct. 48 // 49 // There are bits in the access_flags telling whether inlined tables are present. 50 // Note that accessing the line number and local variable tables is not performance critical at all. 51 // Accessing the checked exceptions table is used by reflection, so we put that last to make access 52 // to it fast. 53 // 54 // The line number table is compressed and inlined following the byte codes. It is found as the first 55 // byte following the byte codes. The checked exceptions table and the local variable table are inlined 56 // after the line number table, and indexed from the end of the method. We do not compress the checked 57 // exceptions table since the average length is less than 2, and do not bother to compress the local 58 // variable table either since it is mostly absent. 59 // 60 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter) 61 // 62 // |------------------------------------------------------| 63 // | header | 64 // | klass | 65 // |------------------------------------------------------| 66 // | constMethodOop (oop) | 67 // | constants (oop) | 68 // |------------------------------------------------------| 69 // | methodData (oop) | 70 // | interp_invocation_count | 71 // |------------------------------------------------------| 72 // | access_flags | 73 // | vtable_index | 74 // |------------------------------------------------------| 75 // | result_index (C++ interpreter only) | 76 // |------------------------------------------------------| 77 // | method_size | max_stack | 78 // | max_locals | size_of_parameters | 79 // |------------------------------------------------------| 80 // | intrinsic_id, (unused) | throwout_count | 81 // |------------------------------------------------------| 82 // | num_breakpoints | (unused) | 83 // |------------------------------------------------------| 84 // | invocation_counter | 85 // | backedge_counter | 86 // |------------------------------------------------------| 87 // | code (pointer) | 88 // | i2i (pointer) | 89 // | adapter (pointer) | 90 // | from_compiled_entry (pointer) | 91 // | from_interpreted_entry (pointer) | 92 // |------------------------------------------------------| 93 // | native_function (present only if native) | 94 // | signature_handler (present only if native) | 95 // |------------------------------------------------------| 96 97 98 class CheckedExceptionElement; 99 class LocalVariableTableElement; 100 class AdapterHandlerEntry; 101 class methodDataOopDesc; 102 103 class methodOopDesc : public oopDesc { 104 friend class methodKlass; 105 friend class VMStructs; 106 private: 107 constMethodOop _constMethod; // Method read-only data. 108 constantPoolOop _constants; // Constant pool 109 methodDataOop _method_data; 110 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 111 AccessFlags _access_flags; // Access flags 112 int _vtable_index; // vtable index of this method (see VtableIndexFlag) 113 // note: can have vtables with >2**16 elements (because of inheritance) 114 #ifdef CC_INTERP 115 int _result_index; // C++ interpreter needs for converting results to/from stack 116 #endif 117 u2 _method_size; // size of this object 118 u2 _max_stack; // Maximum number of entries on the expression stack 119 u2 _max_locals; // Number of local variables used by this method 120 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words 121 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) 122 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 123 u2 _number_of_breakpoints; // fullspeed debugging support 124 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 125 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 126 127 #ifndef PRODUCT 128 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) 129 #endif 130 // Entry point for calling both from and to the interpreter. 131 address _i2i_entry; // All-args-on-stack calling convention 132 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked. 133 AdapterHandlerEntry* _adapter; 134 // Entry point for calling from compiled code, to compiled code if it exists 135 // or else the interpreter. 136 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() 137 // The entry point for calling both from and to compiled code is 138 // "_code->entry_point()". Because of tiered compilation and de-opt, this 139 // field can come and go. It can transition from NULL to not-null at any 140 // time (whenever a compile completes). It can transition from not-null to 141 // NULL only at safepoints (because of a de-opt). 142 nmethod* volatile _code; // Points to the corresponding piece of native code 143 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry 144 145 public: 146 147 static const bool IsUnsafeConc = false; 148 static const bool IsSafeConc = true; 149 150 // accessors for instance variables 151 constMethodOop constMethod() const { return _constMethod; } 152 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); } 153 154 155 static address make_adapters(methodHandle mh, TRAPS); 156 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } 157 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } 158 159 // access flag 160 AccessFlags access_flags() const { return _access_flags; } 161 void set_access_flags(AccessFlags flags) { _access_flags = flags; } 162 163 // name 164 symbolOop name() const { return _constants->symbol_at(name_index()); } 165 int name_index() const { return constMethod()->name_index(); } 166 void set_name_index(int index) { constMethod()->set_name_index(index); } 167 168 // signature 169 symbolOop signature() const { return _constants->symbol_at(signature_index()); } 170 int signature_index() const { return constMethod()->signature_index(); } 171 void set_signature_index(int index) { constMethod()->set_signature_index(index); } 172 173 // generics support 174 symbolOop generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); } 175 int generic_signature_index() const { return constMethod()->generic_signature_index(); } 176 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } 177 178 // annotations support 179 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); } 180 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); } 181 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); } 182 183 #ifdef CC_INTERP 184 void set_result_index(BasicType type); 185 int result_index() { return _result_index; } 186 #endif 187 188 // Helper routine: get klass name + "." + method name + signature as 189 // C string, for the purpose of providing more useful NoSuchMethodErrors 190 // and fatal error handling. The string is allocated in resource 191 // area if a buffer is not provided by the caller. 192 char* name_and_sig_as_C_string(); 193 char* name_and_sig_as_C_string(char* buf, int size); 194 195 // Static routine in the situations we don't have a methodOop 196 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature); 197 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size); 198 199 // JVMTI breakpoints 200 Bytecodes::Code orig_bytecode_at(int bci); 201 void set_orig_bytecode_at(int bci, Bytecodes::Code code); 202 void set_breakpoint(int bci); 203 void clear_breakpoint(int bci); 204 void clear_all_breakpoints(); 205 // Tracking number of breakpoints, for fullspeed debugging. 206 // Only mutated by VM thread. 207 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 208 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 209 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 210 // Initialization only 211 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 212 213 // index into instanceKlass methods() array 214 u2 method_idnum() const { return constMethod()->method_idnum(); } 215 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } 216 217 // code size 218 int code_size() const { return constMethod()->code_size(); } 219 220 // method size 221 int method_size() const { return _method_size; } 222 void set_method_size(int size) { 223 assert(0 <= size && size < (1 << 16), "invalid method size"); 224 _method_size = size; 225 } 226 227 // constant pool for klassOop holding this method 228 constantPoolOop constants() const { return _constants; } 229 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); } 230 231 // max stack 232 int max_stack() const { return _max_stack; } 233 void set_max_stack(int size) { _max_stack = size; } 234 235 // max locals 236 int max_locals() const { return _max_locals; } 237 void set_max_locals(int size) { _max_locals = size; } 238 239 int highest_comp_level() const; 240 void set_highest_comp_level(int level); 241 int highest_osr_comp_level() const; 242 void set_highest_osr_comp_level(int level); 243 244 // Count of times method was exited via exception while interpreting 245 void interpreter_throwout_increment() { 246 if (_interpreter_throwout_count < 65534) { 247 _interpreter_throwout_count++; 248 } 249 } 250 251 int interpreter_throwout_count() const { return _interpreter_throwout_count; } 252 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } 253 254 // size of parameters 255 int size_of_parameters() const { return _size_of_parameters; } 256 257 bool has_stackmap_table() const { 258 return constMethod()->has_stackmap_table(); 259 } 260 261 typeArrayOop stackmap_data() const { 262 return constMethod()->stackmap_data(); 263 } 264 265 void set_stackmap_data(typeArrayOop sd) { 266 constMethod()->set_stackmap_data(sd); 267 } 268 269 // exception handler table 270 typeArrayOop exception_table() const 271 { return constMethod()->exception_table(); } 272 void set_exception_table(typeArrayOop e) 273 { constMethod()->set_exception_table(e); } 274 bool has_exception_handler() const 275 { return constMethod()->has_exception_handler(); } 276 277 // Finds the first entry point bci of an exception handler for an 278 // exception of klass ex_klass thrown at throw_bci. A value of NULL 279 // for ex_klass indicates that the exception klass is not known; in 280 // this case it matches any constraint class. Returns -1 if the 281 // exception cannot be handled in this method. The handler 282 // constraint classes are loaded if necessary. Note that this may 283 // throw an exception if loading of the constraint classes causes 284 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. 285 // If an exception is thrown, returns the bci of the 286 // exception handler which caused the exception to be thrown, which 287 // is needed for proper retries. See, for example, 288 // InterpreterRuntime::exception_handler_for_exception. 289 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); 290 291 // method data access 292 methodDataOop method_data() const { 293 return _method_data; 294 } 295 void set_method_data(methodDataOop data) { 296 oop_store_without_check((oop*)&_method_data, (oop)data); 297 } 298 299 // invocation counter 300 InvocationCounter* invocation_counter() { return &_invocation_counter; } 301 InvocationCounter* backedge_counter() { return &_backedge_counter; } 302 303 int invocation_count(); 304 int backedge_count(); 305 306 bool was_executed_more_than(int n); 307 bool was_never_executed() { return !was_executed_more_than(0); } 308 309 static void build_interpreter_method_data(methodHandle method, TRAPS); 310 311 int interpreter_invocation_count() { 312 if (TieredCompilation) return invocation_count(); 313 else return _interpreter_invocation_count; 314 } 315 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } 316 int increment_interpreter_invocation_count() { 317 if (TieredCompilation) ShouldNotReachHere(); 318 return ++_interpreter_invocation_count; 319 } 320 321 #ifndef PRODUCT 322 int compiled_invocation_count() const { return _compiled_invocation_count; } 323 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } 324 #endif // not PRODUCT 325 326 // Clear (non-shared space) pointers which could not be relevant 327 // if this (shared) method were mapped into another JVM. 328 void remove_unshareable_info(); 329 330 // nmethod/verified compiler entry 331 address verified_code_entry(); 332 bool check_code() const; // Not inline to avoid circular ref 333 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } 334 void clear_code(); // Clear out any compiled code 335 static void set_code(methodHandle mh, nmethod* code); 336 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } 337 address get_i2c_entry(); 338 address get_c2i_entry(); 339 address get_c2i_unverified_entry(); 340 AdapterHandlerEntry* adapter() { return _adapter; } 341 // setup entry points 342 void link_method(methodHandle method, TRAPS); 343 // clear entry points. Used by sharing code 344 void unlink_method(); 345 346 // vtable index 347 enum VtableIndexFlag { 348 // Valid vtable indexes are non-negative (>= 0). 349 // These few negative values are used as sentinels. 350 highest_unused_vtable_index_value = -5, 351 invalid_vtable_index = -4, // distinct from any valid vtable index 352 garbage_vtable_index = -3, // not yet linked; no vtable layout yet 353 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch 354 // 6330203 Note: Do not use -1, which was overloaded with many meanings. 355 }; 356 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) 357 int vtable_index() const { assert(valid_vtable_index(), ""); 358 return _vtable_index; } 359 void set_vtable_index(int index) { _vtable_index = index; } 360 361 // interpreter entry 362 address interpreter_entry() const { return _i2i_entry; } 363 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry 364 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } 365 int interpreter_kind(void) { 366 return constMethod()->interpreter_kind(); 367 } 368 void set_interpreter_kind(); 369 void set_interpreter_kind(int kind) { 370 constMethod()->set_interpreter_kind(kind); 371 } 372 373 // native function (used for native methods only) 374 enum { 375 native_bind_event_is_interesting = true 376 }; 377 address native_function() const { return *(native_function_addr()); } 378 // Must specify a real function (not NULL). 379 // Use clear_native_function() to unregister. 380 void set_native_function(address function, bool post_event_flag); 381 bool has_native_function() const; 382 void clear_native_function(); 383 384 // signature handler (used for native methods only) 385 address signature_handler() const { return *(signature_handler_addr()); } 386 void set_signature_handler(address handler); 387 388 // Interpreter oopmap support 389 void mask_for(int bci, InterpreterOopMap* mask); 390 391 #ifndef PRODUCT 392 // operations on invocation counter 393 void print_invocation_count(); 394 #endif 395 396 // byte codes 397 void set_code(address code) { return constMethod()->set_code(code); } 398 address code_base() const { return constMethod()->code_base(); } 399 bool contains(address bcp) const { return constMethod()->contains(bcp); } 400 401 // prints byte codes 402 void print_codes() const { print_codes_on(tty); } 403 void print_codes_on(outputStream* st) const PRODUCT_RETURN; 404 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; 405 406 // checked exceptions 407 int checked_exceptions_length() const 408 { return constMethod()->checked_exceptions_length(); } 409 CheckedExceptionElement* checked_exceptions_start() const 410 { return constMethod()->checked_exceptions_start(); } 411 412 // localvariable table 413 bool has_localvariable_table() const 414 { return constMethod()->has_localvariable_table(); } 415 int localvariable_table_length() const 416 { return constMethod()->localvariable_table_length(); } 417 LocalVariableTableElement* localvariable_table_start() const 418 { return constMethod()->localvariable_table_start(); } 419 420 bool has_linenumber_table() const 421 { return constMethod()->has_linenumber_table(); } 422 u_char* compressed_linenumber_table() const 423 { return constMethod()->compressed_linenumber_table(); } 424 425 // method holder (the klassOop holding this method) 426 klassOop method_holder() const { return _constants->pool_holder(); } 427 428 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) 429 symbolOop klass_name() const; // returns the name of the method holder 430 BasicType result_type() const; // type of the method result 431 int result_type_index() const; // type index of the method result 432 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } 433 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } 434 435 // Checked exceptions thrown by this method (resolved to mirrors) 436 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } 437 438 // Access flags 439 bool is_public() const { return access_flags().is_public(); } 440 bool is_private() const { return access_flags().is_private(); } 441 bool is_protected() const { return access_flags().is_protected(); } 442 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 443 bool is_static() const { return access_flags().is_static(); } 444 bool is_final() const { return access_flags().is_final(); } 445 bool is_synchronized() const { return access_flags().is_synchronized();} 446 bool is_native() const { return access_flags().is_native(); } 447 bool is_abstract() const { return access_flags().is_abstract(); } 448 bool is_strict() const { return access_flags().is_strict(); } 449 bool is_synthetic() const { return access_flags().is_synthetic(); } 450 451 // returns true if contains only return operation 452 bool is_empty_method() const; 453 454 // returns true if this is a vanilla constructor 455 bool is_vanilla_constructor() const; 456 457 // checks method and its method holder 458 bool is_final_method() const; 459 bool is_strict_method() const; 460 461 // true if method needs no dynamic dispatch (final and/or no vtable entry) 462 bool can_be_statically_bound() const; 463 464 // returns true if the method has any backward branches. 465 bool has_loops() { 466 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); 467 }; 468 469 bool compute_has_loops_flag(); 470 471 bool has_jsrs() { 472 return access_flags().has_jsrs(); 473 }; 474 void set_has_jsrs() { 475 _access_flags.set_has_jsrs(); 476 } 477 478 // returns true if the method has any monitors. 479 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } 480 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } 481 482 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } 483 484 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes 485 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. 486 // has not been computed yet. 487 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } 488 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } 489 490 // returns true if the method is an accessor function (setter/getter). 491 bool is_accessor() const; 492 493 // returns true if the method is an initializer (<init> or <clinit>). 494 bool is_initializer() const; 495 496 // compiled code support 497 // NOTE: code() is inherently racy as deopt can be clearing code 498 // simultaneously. Use with caution. 499 bool has_compiled_code() const { return code() != NULL; } 500 501 // sizing 502 static int object_size(bool is_native); 503 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; } 504 int object_size() const { return method_size(); } 505 506 bool object_is_parsable() const { return method_size() > 0; } 507 508 // interpreter support 509 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); } 510 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); } 511 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); } 512 #ifdef CC_INTERP 513 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); } 514 #endif /* CC_INTERP */ 515 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); } 516 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); } 517 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); } 518 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); } 519 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); } 520 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); } 521 static ByteSize method_data_offset() { 522 return byte_offset_of(methodOopDesc, _method_data); 523 } 524 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); } 525 #ifndef PRODUCT 526 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); } 527 #endif // not PRODUCT 528 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); } 529 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); } 530 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); } 531 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); } 532 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); } 533 534 // for code generation 535 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); } 536 static int interpreter_invocation_counter_offset_in_bytes() 537 { return offset_of(methodOopDesc, _interpreter_invocation_count); } 538 static int intrinsic_id_offset_in_bytes() { return offset_of(methodOopDesc, _intrinsic_id); } 539 static int intrinsic_id_size_in_bytes() { return sizeof(u1); } 540 541 // Static methods that are used to implement member methods where an exposed this pointer 542 // is needed due to possible GCs 543 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS); 544 545 // Returns the byte code index from the byte code pointer 546 int bci_from(address bcp) const; 547 address bcp_from(int bci) const; 548 int validate_bci_from_bcx(intptr_t bcx) const; 549 550 // Returns the line number for a bci if debugging information for the method is prowided, 551 // -1 is returned otherwise. 552 int line_number_from_bci(int bci) const; 553 554 // Reflection support 555 bool is_overridden_in(klassOop k) const; 556 557 // JSR 292 support 558 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); } 559 static bool is_method_handle_invoke_name(vmSymbols::SID name_sid); 560 static bool is_method_handle_invoke_name(symbolOop name) { 561 return is_method_handle_invoke_name(vmSymbols::find_sid(name)); 562 } 563 // Tests if this method is an internal adapter frame from the 564 // MethodHandleCompiler. 565 bool is_method_handle_adapter() const; 566 static methodHandle make_invoke_method(KlassHandle holder, 567 symbolHandle name, //invokeExact or invokeGeneric 568 symbolHandle signature, //anything at all 569 Handle method_type, 570 TRAPS); 571 // these operate only on invoke methods: 572 oop method_handle_type() const; 573 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1 574 // presize interpreter frames for extra interpreter stack entries, if needed 575 // method handles want to be able to push a few extra values (e.g., a bound receiver), and 576 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, 577 // all without checking for a stack overflow 578 static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); } 579 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize() 580 581 // RedefineClasses() support: 582 bool is_old() const { return access_flags().is_old(); } 583 void set_is_old() { _access_flags.set_is_old(); } 584 bool is_obsolete() const { return access_flags().is_obsolete(); } 585 void set_is_obsolete() { _access_flags.set_is_obsolete(); } 586 // see the definition in methodOop.cpp for the gory details 587 bool should_not_be_cached() const; 588 589 // JVMTI Native method prefixing support: 590 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } 591 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } 592 593 // Rewriting support 594 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 595 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); 596 597 // Get this method's jmethodID -- allocate if it doesn't exist 598 jmethodID jmethod_id() { methodHandle this_h(this); 599 return instanceKlass::get_jmethod_id(method_holder(), this_h); } 600 601 // Lookup the jmethodID for this method. Return NULL if not found. 602 // NOTE that this function can be called from a signal handler 603 // (see AsyncGetCallTrace support for Forte Analyzer) and this 604 // needs to be async-safe. No allocation should be done and 605 // so handles are not used to avoid deadlock. 606 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); } 607 608 // JNI static invoke cached itable index accessors 609 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } 610 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } 611 612 // Support for inlining of intrinsic methods 613 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } 614 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } 615 616 // Helper routines for intrinsic_id() and vmIntrinsics::method(). 617 void init_intrinsic_id(); // updates from _none if a match 618 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder); 619 620 // On-stack replacement support 621 bool has_osr_nmethod(int level, bool match_level) { 622 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; 623 } 624 625 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { 626 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level); 627 } 628 629 // Inline cache support 630 void cleanup_inline_caches(); 631 632 // Find if klass for method is loaded 633 bool is_klass_loaded_by_klass_index(int klass_index) const; 634 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; 635 636 // Indicates whether compilation failed earlier for this method, or 637 // whether it is not compilable for another reason like having a 638 // breakpoint set in it. 639 bool is_not_compilable(int comp_level = CompLevel_any) const; 640 void set_not_compilable(int comp_level = CompLevel_all, bool report = true); 641 void set_not_compilable_quietly(int comp_level = CompLevel_all) { 642 set_not_compilable(comp_level, false); 643 } 644 bool is_not_osr_compilable(int comp_level = CompLevel_any) const { 645 return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable(); 646 } 647 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); } 648 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } 649 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } 650 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } 651 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } 652 653 // Background compilation support 654 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } 655 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } 656 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } 657 658 static methodOop method_from_bcp(address bcp); 659 660 // Resolve all classes in signature, return 'true' if successful 661 static bool load_signature_classes(methodHandle m, TRAPS); 662 663 // Return if true if not all classes references in signature, including return type, has been loaded 664 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); 665 666 // Printing 667 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM 668 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)" 669 670 // Helper routine used for method sorting 671 static void sort_methods(objArrayOop methods, 672 objArrayOop methods_annotations, 673 objArrayOop methods_parameter_annotations, 674 objArrayOop methods_default_annotations, 675 bool idempotent = false); 676 677 // size of parameters 678 void set_size_of_parameters(int size) { _size_of_parameters = size; } 679 private: 680 681 // Inlined elements 682 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } 683 address* signature_handler_addr() const { return native_function_addr() + 1; } 684 685 // Garbage collection support 686 oop* adr_constMethod() const { return (oop*)&_constMethod; } 687 oop* adr_constants() const { return (oop*)&_constants; } 688 oop* adr_method_data() const { return (oop*)&_method_data; } 689 }; 690 691 692 // Utility class for compressing line number tables 693 694 class CompressedLineNumberWriteStream: public CompressedWriteStream { 695 private: 696 int _bci; 697 int _line; 698 public: 699 // Constructor 700 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} 701 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} 702 703 // Write (bci, line number) pair to stream 704 void write_pair_regular(int bci_delta, int line_delta); 705 706 inline void write_pair_inline(int bci, int line) { 707 int bci_delta = bci - _bci; 708 int line_delta = line - _line; 709 _bci = bci; 710 _line = line; 711 // Skip (0,0) deltas - they do not add information and conflict with terminator. 712 if (bci_delta == 0 && line_delta == 0) return; 713 // Check if bci is 5-bit and line number 3-bit unsigned. 714 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { 715 // Compress into single byte. 716 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; 717 // Check that value doesn't match escape character. 718 if (value != 0xFF) { 719 write_byte(value); 720 return; 721 } 722 } 723 write_pair_regular(bci_delta, line_delta); 724 } 725 726 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. 727 // Disabling optimization doesn't work for methods in header files 728 // so we force it to call through the non-optimized version in the .cpp. 729 // It's gross, but it's the only way we can ensure that all callers are 730 // fixed. MSC_VER is defined in build/windows/makefiles/compile.make. 731 #if defined(_M_AMD64) && MSC_VER >= 1400 732 void write_pair(int bci, int line); 733 #else 734 void write_pair(int bci, int line) { write_pair_inline(bci, line); } 735 #endif 736 737 // Write end-of-stream marker 738 void write_terminator() { write_byte(0); } 739 }; 740 741 742 // Utility class for decompressing line number tables 743 744 class CompressedLineNumberReadStream: public CompressedReadStream { 745 private: 746 int _bci; 747 int _line; 748 public: 749 // Constructor 750 CompressedLineNumberReadStream(u_char* buffer); 751 // Read (bci, line number) pair from stream. Returns false at end-of-stream. 752 bool read_pair(); 753 // Accessing bci and line number (after calling read_pair) 754 int bci() const { return _bci; } 755 int line() const { return _line; } 756 }; 757 758 759 /// Fast Breakpoints. 760 761 // If this structure gets more complicated (because bpts get numerous), 762 // move it into its own header. 763 764 // There is presently no provision for concurrent access 765 // to breakpoint lists, which is only OK for JVMTI because 766 // breakpoints are written only at safepoints, and are read 767 // concurrently only outside of safepoints. 768 769 class BreakpointInfo : public CHeapObj { 770 friend class VMStructs; 771 private: 772 Bytecodes::Code _orig_bytecode; 773 int _bci; 774 u2 _name_index; // of method 775 u2 _signature_index; // of method 776 BreakpointInfo* _next; // simple storage allocation 777 778 public: 779 BreakpointInfo(methodOop m, int bci); 780 781 // accessors 782 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } 783 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } 784 int bci() { return _bci; } 785 786 BreakpointInfo* next() const { return _next; } 787 void set_next(BreakpointInfo* n) { _next = n; } 788 789 // helps for searchers 790 bool match(methodOop m, int bci) { 791 return bci == _bci && match(m); 792 } 793 794 bool match(methodOop m) { 795 return _name_index == m->name_index() && 796 _signature_index == m->signature_index(); 797 } 798 799 void set(methodOop method); 800 void clear(methodOop method); 801 }; 802 803 #endif // SHARE_VM_OOPS_METHODOOP_HPP