1 /* 2 * Copyright (c) 1997, 2016, 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_RUNTIME_SHAREDRUNTIME_HPP 26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 27 28 #include "interpreter/bytecodeHistogram.hpp" 29 #include "interpreter/bytecodeTracer.hpp" 30 #include "interpreter/linkResolver.hpp" 31 #include "memory/allocation.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "utilities/hashtable.hpp" 34 #include "utilities/macros.hpp" 35 36 class AdapterHandlerEntry; 37 class AdapterHandlerTable; 38 class AdapterFingerPrint; 39 class vframeStream; 40 41 // Used for adapter generation. One SigEntry is used per element of 42 // the signature of the method. Value type arguments are treated 43 // specially. See comment for collect_fields(). 44 class SigEntry VALUE_OBJ_CLASS_SPEC { 45 public: 46 BasicType _bt; 47 int _offset; 48 49 SigEntry() 50 : _bt(T_ILLEGAL), _offset(-1) { 51 } 52 SigEntry(BasicType bt, int offset) 53 : _bt(bt), _offset(offset) {} 54 55 SigEntry(BasicType bt) 56 : _bt(bt), _offset(-1) {} 57 58 static int compare(SigEntry* e1, SigEntry* e2) { 59 if (e1->_offset != e2->_offset) { 60 return e1->_offset - e2->_offset; 61 } 62 assert((e1->_bt == T_LONG && (e2->_bt == T_LONG || e2->_bt == T_VOID)) || 63 (e1->_bt == T_DOUBLE && (e2->_bt == T_DOUBLE || e2->_bt == T_VOID)) || 64 e1->_bt == T_VALUETYPE || e2->_bt == T_VALUETYPE || e1->_bt == T_VOID || e2->_bt == T_VOID, "bad bt"); 65 if (e1->_bt == e2->_bt) { 66 assert(e1->_bt == T_VALUETYPE || e1->_bt == T_VOID, "only ones with duplicate offsets"); 67 return 0; 68 } 69 if (e1->_bt == T_VOID || 70 e2->_bt == T_VALUETYPE) { 71 return 1; 72 } 73 if (e1->_bt == T_VALUETYPE || 74 e2->_bt == T_VOID) { 75 return -1; 76 } 77 ShouldNotReachHere(); 78 return 0; 79 } 80 }; 81 82 83 // Runtime is the base class for various runtime interfaces 84 // (InterpreterRuntime, CompilerRuntime, etc.). It provides 85 // shared functionality such as exception forwarding (C++ to 86 // Java exceptions), locking/unlocking mechanisms, statistical 87 // information, etc. 88 89 class SharedRuntime: AllStatic { 90 friend class VMStructs; 91 92 private: 93 static methodHandle resolve_sub_helper(JavaThread *thread, 94 bool is_virtual, 95 bool is_optimized, TRAPS); 96 97 // Shared stub locations 98 99 static RuntimeStub* _wrong_method_blob; 100 static RuntimeStub* _wrong_method_abstract_blob; 101 static RuntimeStub* _ic_miss_blob; 102 static RuntimeStub* _resolve_opt_virtual_call_blob; 103 static RuntimeStub* _resolve_virtual_call_blob; 104 static RuntimeStub* _resolve_static_call_blob; 105 static address _resolve_static_call_entry; 106 107 static DeoptimizationBlob* _deopt_blob; 108 109 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob; 110 static SafepointBlob* _polling_page_safepoint_handler_blob; 111 static SafepointBlob* _polling_page_return_handler_blob; 112 113 #ifdef COMPILER2 114 static UncommonTrapBlob* _uncommon_trap_blob; 115 #endif // COMPILER2 116 117 #ifndef PRODUCT 118 // Counters 119 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 120 #endif // !PRODUCT 121 122 private: 123 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP }; 124 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type); 125 static RuntimeStub* generate_resolve_blob(address destination, const char* name); 126 127 public: 128 static void generate_stubs(void); 129 130 // max bytes for each dtrace string parameter 131 enum { max_dtrace_string_size = 256 }; 132 133 // The following arithmetic routines are used on platforms that do 134 // not have machine instructions to implement their functionality. 135 // Do not remove these. 136 137 // long arithmetics 138 static jlong lmul(jlong y, jlong x); 139 static jlong ldiv(jlong y, jlong x); 140 static jlong lrem(jlong y, jlong x); 141 142 // float and double remainder 143 static jfloat frem(jfloat x, jfloat y); 144 static jdouble drem(jdouble x, jdouble y); 145 146 147 #ifdef _WIN64 148 // Workaround for fmod issue in the Windows x64 CRT 149 static double fmod_winx64(double x, double y); 150 #endif 151 152 #ifdef __SOFTFP__ 153 static jfloat fadd(jfloat x, jfloat y); 154 static jfloat fsub(jfloat x, jfloat y); 155 static jfloat fmul(jfloat x, jfloat y); 156 static jfloat fdiv(jfloat x, jfloat y); 157 158 static jdouble dadd(jdouble x, jdouble y); 159 static jdouble dsub(jdouble x, jdouble y); 160 static jdouble dmul(jdouble x, jdouble y); 161 static jdouble ddiv(jdouble x, jdouble y); 162 #endif // __SOFTFP__ 163 164 // float conversion (needs to set appropriate rounding mode) 165 static jint f2i (jfloat x); 166 static jlong f2l (jfloat x); 167 static jint d2i (jdouble x); 168 static jlong d2l (jdouble x); 169 static jfloat d2f (jdouble x); 170 static jfloat l2f (jlong x); 171 static jdouble l2d (jlong x); 172 173 #ifdef __SOFTFP__ 174 static jfloat i2f (jint x); 175 static jdouble i2d (jint x); 176 static jdouble f2d (jfloat x); 177 #endif // __SOFTFP__ 178 179 // double trigonometrics and transcendentals 180 static jdouble dsin(jdouble x); 181 static jdouble dcos(jdouble x); 182 static jdouble dtan(jdouble x); 183 static jdouble dlog(jdouble x); 184 static jdouble dlog10(jdouble x); 185 static jdouble dexp(jdouble x); 186 static jdouble dpow(jdouble x, jdouble y); 187 188 #if defined(__SOFTFP__) || defined(E500V2) 189 static double dabs(double f); 190 #endif 191 192 #if defined(__SOFTFP__) || defined(PPC) 193 static double dsqrt(double f); 194 #endif 195 196 // Montgomery multiplication 197 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 198 jint len, jlong inv, jint *m_ints); 199 static void montgomery_square(jint *a_ints, jint *n_ints, 200 jint len, jlong inv, jint *m_ints); 201 202 #ifdef __SOFTFP__ 203 // C++ compiler generates soft float instructions as well as passing 204 // float and double in registers. 205 static int fcmpl(float x, float y); 206 static int fcmpg(float x, float y); 207 static int dcmpl(double x, double y); 208 static int dcmpg(double x, double y); 209 210 static int unordered_fcmplt(float x, float y); 211 static int unordered_dcmplt(double x, double y); 212 static int unordered_fcmple(float x, float y); 213 static int unordered_dcmple(double x, double y); 214 static int unordered_fcmpge(float x, float y); 215 static int unordered_dcmpge(double x, double y); 216 static int unordered_fcmpgt(float x, float y); 217 static int unordered_dcmpgt(double x, double y); 218 219 static float fneg(float f); 220 static double dneg(double f); 221 #endif 222 223 // exception handling across interpreter/compiler boundaries 224 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 225 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 226 227 #if INCLUDE_ALL_GCS 228 // G1 write barriers 229 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 230 static void g1_wb_post(void* card_addr, JavaThread* thread); 231 #endif // INCLUDE_ALL_GCS 232 233 // exception handling and implicit exceptions 234 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception, 235 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred); 236 enum ImplicitExceptionKind { 237 IMPLICIT_NULL, 238 IMPLICIT_DIVIDE_BY_ZERO, 239 STACK_OVERFLOW 240 }; 241 static void throw_AbstractMethodError(JavaThread* thread); 242 static void throw_IncompatibleClassChangeError(JavaThread* thread); 243 static void throw_ArithmeticException(JavaThread* thread); 244 static void throw_NullPointerException(JavaThread* thread); 245 static void throw_NullPointerException_at_call(JavaThread* thread); 246 static void throw_StackOverflowError(JavaThread* thread); 247 static void throw_delayed_StackOverflowError(JavaThread* thread); 248 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed); 249 static address continuation_for_implicit_exception(JavaThread* thread, 250 address faulting_pc, 251 ImplicitExceptionKind exception_kind); 252 #if INCLUDE_JVMCI 253 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason); 254 #endif 255 256 static void enable_stack_reserved_zone(JavaThread* thread); 257 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr); 258 259 // Shared stub locations 260 static address get_poll_stub(address pc); 261 262 static address get_ic_miss_stub() { 263 assert(_ic_miss_blob!= NULL, "oops"); 264 return _ic_miss_blob->entry_point(); 265 } 266 267 static address get_handle_wrong_method_stub() { 268 assert(_wrong_method_blob!= NULL, "oops"); 269 return _wrong_method_blob->entry_point(); 270 } 271 272 static address get_handle_wrong_method_abstract_stub() { 273 assert(_wrong_method_abstract_blob!= NULL, "oops"); 274 return _wrong_method_abstract_blob->entry_point(); 275 } 276 277 #ifdef COMPILER2 278 static void generate_uncommon_trap_blob(void); 279 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 280 #endif // COMPILER2 281 282 static address get_resolve_opt_virtual_call_stub() { 283 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 284 return _resolve_opt_virtual_call_blob->entry_point(); 285 } 286 static address get_resolve_virtual_call_stub() { 287 assert(_resolve_virtual_call_blob != NULL, "oops"); 288 return _resolve_virtual_call_blob->entry_point(); 289 } 290 static address get_resolve_static_call_stub() { 291 assert(_resolve_static_call_blob != NULL, "oops"); 292 return _resolve_static_call_blob->entry_point(); 293 } 294 295 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 296 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 297 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 298 299 // Counters 300 #ifndef PRODUCT 301 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 302 #endif // PRODUCT 303 304 // Helper routine for full-speed JVMTI exception throwing support 305 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 306 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 307 308 // RedefineClasses() tracing support for obsolete method entry 309 static int rc_trace_method_entry(JavaThread* thread, Method* m); 310 311 // To be used as the entry point for unresolved native methods. 312 static address native_method_throw_unsatisfied_link_error_entry(); 313 static address native_method_throw_unsupported_operation_exception_entry(); 314 315 static oop retrieve_receiver(Symbol* sig, frame caller); 316 317 static void register_finalizer(JavaThread* thread, oopDesc* obj); 318 319 // dtrace notifications 320 static int dtrace_object_alloc(oopDesc* o, int size); 321 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size); 322 static int dtrace_method_entry(JavaThread* thread, Method* m); 323 static int dtrace_method_exit(JavaThread* thread, Method* m); 324 325 // Utility method for retrieving the Java thread id, returns 0 if the 326 // thread is not a well formed Java thread. 327 static jlong get_java_tid(Thread* thread); 328 329 330 // used by native wrappers to reenable yellow if overflow happened in native code 331 static void reguard_yellow_pages(); 332 333 // Fill in the "X cannot be cast to a Y" message for ClassCastException 334 // 335 // @param thr the current thread 336 // @param caster_klass the class of the object we are casting 337 // @return the dynamically allocated exception message (must be freed 338 // by the caller using a resource mark) 339 // 340 // BCP must refer to the current 'checkcast' opcode for the frame 341 // on top of the stack. 342 // The caller (or one of its callers) must use a ResourceMark 343 // in order to correctly free the result. 344 // 345 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass); 346 347 // Fill in the "X cannot be cast to a Y" message for ClassCastException 348 // 349 // @param caster_klass the class of the object we are casting 350 // @param target_klass the target klass attempt 351 // @return the dynamically allocated exception message (must be freed 352 // by the caller using a resource mark) 353 // 354 // This version does not require access the frame, so it can be called 355 // from interpreted code 356 // The caller (or one of it's callers) must use a ResourceMark 357 // in order to correctly free the result. 358 // 359 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass); 360 361 // Resolves a call site- may patch in the destination of the call into the 362 // compiled code. 363 static methodHandle resolve_helper(JavaThread *thread, 364 bool is_virtual, 365 bool is_optimized, TRAPS); 366 367 private: 368 // deopt blob 369 static void generate_deopt_blob(void); 370 371 public: 372 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 373 374 // Resets a call-site in compiled code so it will get resolved again. 375 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 376 377 // In the code prolog, if the klass comparison fails, the inline cache 378 // misses and the call site is patched to megamorphic 379 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 380 381 // Find the method that called us. 382 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 383 384 385 private: 386 static Handle find_callee_info(JavaThread* thread, 387 Bytecodes::Code& bc, 388 CallInfo& callinfo, TRAPS); 389 static Handle find_callee_info_helper(JavaThread* thread, 390 vframeStream& vfst, 391 Bytecodes::Code& bc, 392 CallInfo& callinfo, TRAPS); 393 394 static methodHandle extract_attached_method(vframeStream& vfst); 395 396 static address clean_virtual_call_entry(); 397 static address clean_opt_virtual_call_entry(); 398 static address clean_static_call_entry(); 399 400 #if defined(X86) && defined(COMPILER1) 401 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available. 402 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, methodHandle method, Register obj_reg, Register result); 403 #endif // X86 && COMPILER1 404 405 public: 406 407 // Read the array of BasicTypes from a Java signature, and compute where 408 // compiled Java code would like to put the results. Values in reg_lo and 409 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 410 // registers, those above refer to 4-byte stack slots. All stack slots are 411 // based off of the window top. SharedInfo::stack0 refers to the first usable 412 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 413 // 4-bytes higher. So for sparc because the register window save area is at 414 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 415 // will be just above it. ( 416 // return value is the maximum number of VMReg stack slots the convention will use. 417 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing); 418 419 static void check_member_name_argument_is_last_argument(const methodHandle& method, 420 const BasicType* sig_bt, 421 const VMRegPair* regs) NOT_DEBUG_RETURN; 422 423 // Ditto except for calling C 424 // 425 // C argument in register AND stack slot. 426 // Some architectures require that an argument must be passed in a register 427 // AND in a stack slot. These architectures provide a second VMRegPair array 428 // to be filled by the c_calling_convention method. On other architectures, 429 // NULL is being passed as the second VMRegPair array, so arguments are either 430 // passed in a register OR in a stack slot. 431 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2, 432 int total_args_passed); 433 434 static size_t trampoline_size(); 435 436 static void generate_trampoline(MacroAssembler *masm, address destination); 437 438 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 439 // blobs. Unlike adapters in the tiger and earlier releases the code in these 440 // blobs does not create a new frame and are therefore virtually invisible 441 // to the stack walking code. In general these blobs extend the callers stack 442 // as needed for the conversion of argument locations. 443 444 // When calling a c2i blob the code will always call the interpreter even if 445 // by the time we reach the blob there is compiled code available. This allows 446 // the blob to pass the incoming stack pointer (the sender sp) in a known 447 // location for the interpreter to record. This is used by the frame code 448 // to correct the sender code to match up with the stack pointer when the 449 // thread left the compiled code. In addition it allows the interpreter 450 // to remove the space the c2i adapter allocated to do its argument conversion. 451 452 // Although a c2i blob will always run interpreted even if compiled code is 453 // present if we see that compiled code is present the compiled call site 454 // will be patched/re-resolved so that later calls will run compiled. 455 456 // Additionally a c2i blob need to have a unverified entry because it can be reached 457 // in situations where the call site is an inlined cache site and may go megamorphic. 458 459 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 460 // that the interpreter before it does any call dispatch will record the current 461 // stack pointer in the interpreter frame. On return it will restore the stack 462 // pointer as needed. This means the i2c adapter code doesn't need any special 463 // handshaking path with compiled code to keep the stack walking correct. 464 465 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm, 466 int comp_args_on_stack, 467 const GrowableArray<SigEntry>& sig_extended, 468 const VMRegPair *regs, 469 AdapterFingerPrint* fingerprint, 470 AdapterBlob*& new_adapter); 471 472 static void gen_i2c_adapter(MacroAssembler *_masm, 473 int comp_args_on_stack, 474 const GrowableArray<SigEntry>& sig_extended, 475 const VMRegPair *regs); 476 477 // OSR support 478 479 // OSR_migration_begin will extract the jvm state from an interpreter 480 // frame (locals, monitors) and store the data in a piece of C heap 481 // storage. This then allows the interpreter frame to be removed from the 482 // stack and the OSR nmethod to be called. That method is called with a 483 // pointer to the C heap storage. This pointer is the return value from 484 // OSR_migration_begin. 485 486 static intptr_t* OSR_migration_begin(JavaThread *thread); 487 488 // OSR_migration_end is a trivial routine. It is called after the compiled 489 // method has extracted the jvm state from the C heap that OSR_migration_begin 490 // created. It's entire job is to simply free this storage. 491 static void OSR_migration_end(intptr_t* buf); 492 493 // Convert a sig into a calling convention register layout 494 // and find interesting things about it. 495 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 496 static VMReg name_for_receiver(); 497 498 // "Top of Stack" slots that may be unused by the calling convention but must 499 // otherwise be preserved. 500 // On Intel these are not necessary and the value can be zero. 501 // On Sparc this describes the words reserved for storing a register window 502 // when an interrupt occurs. 503 static uint out_preserve_stack_slots(); 504 505 // Is vector's size (in bytes) bigger than a size saved by default? 506 // For example, on x86 16 bytes XMM registers are saved by default. 507 static bool is_wide_vector(int size); 508 509 // Save and restore a native result 510 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 511 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 512 513 // Generate a native wrapper for a given method. The method takes arguments 514 // in the Java compiled code convention, marshals them to the native 515 // convention (handlizes oops, etc), transitions to native, makes the call, 516 // returns to java state (possibly blocking), unhandlizes any result and 517 // returns. 518 // 519 // The wrapper may contain special-case code if the given method 520 // is a JNI critical method, or a compiled method handle adapter, 521 // such as _invokeBasic, _linkToVirtual, etc. 522 static nmethod* generate_native_wrapper(MacroAssembler* masm, 523 const methodHandle& method, 524 int compile_id, 525 BasicType* sig_bt, 526 VMRegPair* regs, 527 BasicType ret_type); 528 529 // Block before entering a JNI critical method 530 static void block_for_jni_critical(JavaThread* thread); 531 532 // A compiled caller has just called the interpreter, but compiled code 533 // exists. Patch the caller so he no longer calls into the interpreter. 534 static void fixup_callers_callsite(Method* moop, address ret_pc); 535 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 536 537 // Slow-path Locking and Unlocking 538 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 539 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 540 541 // Resolving of calls 542 static address resolve_static_call_C (JavaThread *thread); 543 static address resolve_virtual_call_C (JavaThread *thread); 544 static address resolve_opt_virtual_call_C(JavaThread *thread); 545 546 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 547 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 548 oopDesc* dest, jint dest_pos, 549 jint length, JavaThread* thread); 550 551 // handle ic miss with caller being compiled code 552 // wrong method handling (inline cache misses, zombie methods) 553 static address handle_wrong_method(JavaThread* thread); 554 static address handle_wrong_method_abstract(JavaThread* thread); 555 static address handle_wrong_method_ic_miss(JavaThread* thread); 556 static void allocate_value_types(JavaThread* thread, Method* callee); 557 static void apply_post_barriers(JavaThread* thread, objArrayOopDesc* array); 558 559 static address handle_unsafe_access(JavaThread* thread, address next_pc); 560 561 #ifndef PRODUCT 562 563 // Collect and print inline cache miss statistics 564 private: 565 enum { maxICmiss_count = 100 }; 566 static int _ICmiss_index; // length of IC miss histogram 567 static int _ICmiss_count[maxICmiss_count]; // miss counts 568 static address _ICmiss_at[maxICmiss_count]; // miss addresses 569 static void trace_ic_miss(address at); 570 571 public: 572 static int _throw_null_ctr; // throwing a null-pointer exception 573 static int _ic_miss_ctr; // total # of IC misses 574 static int _wrong_method_ctr; 575 static int _resolve_static_ctr; 576 static int _resolve_virtual_ctr; 577 static int _resolve_opt_virtual_ctr; 578 static int _implicit_null_throws; 579 static int _implicit_div0_throws; 580 581 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 582 static int _jshort_array_copy_ctr; // Slow-path short array copy 583 static int _jint_array_copy_ctr; // Slow-path int array copy 584 static int _jlong_array_copy_ctr; // Slow-path long array copy 585 static int _oop_array_copy_ctr; // Slow-path oop array copy 586 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 587 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 588 static int _generic_array_copy_ctr; // Slow-path includes type decoding 589 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 590 591 static int _new_instance_ctr; // 'new' object requires GC 592 static int _new_array_ctr; // 'new' array requires GC 593 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 594 static int _find_handler_ctr; // find exception handler 595 static int _rethrow_ctr; // rethrow exception 596 static int _mon_enter_stub_ctr; // monitor enter stub 597 static int _mon_exit_stub_ctr; // monitor exit stub 598 static int _mon_enter_ctr; // monitor enter slow 599 static int _mon_exit_ctr; // monitor exit slow 600 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 601 602 // Statistics code 603 // stats for "normal" compiled calls (non-interface) 604 static int _nof_normal_calls; // total # of calls 605 static int _nof_optimized_calls; // total # of statically-bound calls 606 static int _nof_inlined_calls; // total # of inlined normal calls 607 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 608 static int _nof_inlined_static_calls; // total # of inlined static calls 609 // stats for compiled interface calls 610 static int _nof_interface_calls; // total # of compiled calls 611 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 612 static int _nof_inlined_interface_calls; // total # of inlined interface calls 613 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 614 // stats for runtime exceptions 615 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 616 617 public: // for compiler 618 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 619 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 620 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 621 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 622 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 623 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 624 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 625 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 626 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 627 static void print_call_statistics(int comp_total); 628 static void print_statistics(); 629 static void print_ic_miss_histogram(); 630 631 #endif // PRODUCT 632 }; 633 634 635 // --------------------------------------------------------------------------- 636 // Implementation of AdapterHandlerLibrary 637 // 638 // This library manages argument marshaling adapters and native wrappers. 639 // There are 2 flavors of adapters: I2C and C2I. 640 // 641 // The I2C flavor takes a stock interpreted call setup, marshals the 642 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 643 // code_begin(). It is broken to call it without an nmethod assigned. 644 // The usual behavior is to lift any register arguments up out of the 645 // stack and possibly re-pack the extra arguments to be contiguous. 646 // I2C adapters will save what the interpreter's stack pointer will be 647 // after arguments are popped, then adjust the interpreter's frame 648 // size to force alignment and possibly to repack the arguments. 649 // After re-packing, it jumps to the compiled code start. There are 650 // no safepoints in this adapter code and a GC cannot happen while 651 // marshaling is in progress. 652 // 653 // The C2I flavor takes a stock compiled call setup plus the target method in 654 // Rmethod, marshals the arguments for an interpreted call and jumps to 655 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 656 // setup. Compiled frames are fixed-size and the args are likely not in the 657 // right place. Hence all the args will likely be copied into the 658 // interpreter's frame, forcing that frame to grow. The compiled frame's 659 // outgoing stack args will be dead after the copy. 660 // 661 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 662 // also perform an official frame push & pop. They have a call to the native 663 // routine in their middles and end in a return (instead of ending in a jump). 664 // The native wrappers are stored in real nmethods instead of the BufferBlobs 665 // used by the adapters. The code generation happens here because it's very 666 // similar to what the adapters have to do. 667 668 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 669 friend class AdapterHandlerTable; 670 671 private: 672 AdapterFingerPrint* _fingerprint; 673 address _i2c_entry; 674 address _c2i_entry; 675 address _c2i_unverified_entry; 676 Symbol* _sig_extended; 677 678 #ifdef ASSERT 679 // Captures code and signature used to generate this adapter when 680 // verifying adapter equivalence. 681 unsigned char* _saved_code; 682 int _saved_code_length; 683 #endif 684 685 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, Symbol* sig_extended) { 686 _fingerprint = fingerprint; 687 _i2c_entry = i2c_entry; 688 _c2i_entry = c2i_entry; 689 _c2i_unverified_entry = c2i_unverified_entry; 690 _sig_extended = sig_extended; 691 #ifdef ASSERT 692 _saved_code = NULL; 693 _saved_code_length = 0; 694 #endif 695 } 696 697 void deallocate(); 698 699 // should never be used 700 AdapterHandlerEntry(); 701 702 public: 703 address get_i2c_entry() const { return _i2c_entry; } 704 address get_c2i_entry() const { return _c2i_entry; } 705 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 706 Symbol* get_sig_extended() const { return _sig_extended; } 707 address base_address(); 708 void relocate(address new_base); 709 710 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 711 712 AdapterHandlerEntry* next() { 713 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 714 } 715 716 #ifdef ASSERT 717 // Used to verify that code generated for shared adapters is equivalent 718 void save_code (unsigned char* code, int length); 719 bool compare_code(unsigned char* code, int length); 720 #endif 721 722 //virtual void print_on(outputStream* st) const; DO NOT USE 723 void print_adapter_on(outputStream* st) const; 724 }; 725 726 // This class is used only with DumpSharedSpaces==true. It holds extra information 727 // that's used only during CDS dump time. 728 // For details, see comments around Method::link_method() 729 class CDSAdapterHandlerEntry: public AdapterHandlerEntry { 730 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region 731 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region 732 733 public: 734 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; } 735 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; } 736 void init() NOT_CDS_RETURN; 737 }; 738 739 740 class AdapterHandlerLibrary: public AllStatic { 741 private: 742 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 743 static AdapterHandlerTable* _adapters; 744 static AdapterHandlerEntry* _abstract_method_handler; 745 static BufferBlob* buffer_blob(); 746 static void initialize(); 747 static AdapterHandlerEntry* get_adapter0(const methodHandle& method); 748 749 public: 750 751 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 752 address i2c_entry, address c2i_entry, address c2i_unverified_entry, 753 Symbol* sig_extended = NULL); 754 static void create_native_wrapper(const methodHandle& method); 755 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 756 757 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 758 static void print_handler_on(outputStream* st, const CodeBlob* b); 759 static bool contains(const CodeBlob* b); 760 #ifndef PRODUCT 761 static void print_statistics(); 762 #endif // PRODUCT 763 764 }; 765 766 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP