1 /* 2 * Copyright (c) 1997, 2025, 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_RUNTIME_SHAREDRUNTIME_HPP 26 #define SHARE_RUNTIME_SHAREDRUNTIME_HPP 27 28 #include "classfile/compactHashtable.hpp" 29 #include "code/codeBlob.hpp" 30 #include "code/vmreg.hpp" 31 #include "interpreter/linkResolver.hpp" 32 #include "memory/allStatic.hpp" 33 #include "memory/metaspaceClosure.hpp" 34 #include "memory/resourceArea.hpp" 35 #include "runtime/stubInfo.hpp" 36 #include "utilities/macros.hpp" 37 38 class AdapterHandlerEntry; 39 class AdapterFingerPrint; 40 class vframeStream; 41 42 // Runtime is the base class for various runtime interfaces 43 // (InterpreterRuntime, CompilerRuntime, etc.). It provides 44 // shared functionality such as exception forwarding (C++ to 45 // Java exceptions), locking/unlocking mechanisms, statistical 46 // information, etc. 47 48 class SharedRuntime: AllStatic { 49 private: 50 // Declare shared stub fields 51 #define SHARED_STUB_FIELD_DECLARE(name, type) \ 52 static type* BLOB_FIELD_NAME(name); 53 SHARED_STUBS_DO(SHARED_STUB_FIELD_DECLARE) 54 #undef SHARED_STUB_FIELD_DECLARE 55 56 #ifdef ASSERT 57 static bool is_resolve_id(StubId id) { 58 return (id == StubId::shared_wrong_method_id || 59 id == StubId::shared_wrong_method_abstract_id || 60 id == StubId::shared_ic_miss_id || 61 id == StubId::shared_resolve_opt_virtual_call_id || 62 id == StubId::shared_resolve_virtual_call_id || 63 id == StubId::shared_resolve_static_call_id); 64 } 65 static bool is_polling_page_id(StubId id) { 66 return (id == StubId::shared_polling_page_vectors_safepoint_handler_id || 67 id == StubId::shared_polling_page_safepoint_handler_id || 68 id == StubId::shared_polling_page_return_handler_id); 69 } 70 static bool is_throw_id(StubId id) { 71 return (id == StubId::shared_throw_AbstractMethodError_id || 72 id == StubId::shared_throw_IncompatibleClassChangeError_id || 73 id == StubId::shared_throw_NullPointerException_at_call_id || 74 id == StubId::shared_throw_StackOverflowError_id || 75 id == StubId::shared_throw_delayed_StackOverflowError_id); 76 } 77 #endif 78 79 #ifndef PRODUCT 80 // Counters 81 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 82 #endif // !PRODUCT 83 84 private: 85 static SafepointBlob* generate_handler_blob(StubId id, address call_ptr); 86 static RuntimeStub* generate_resolve_blob(StubId id, address destination); 87 static RuntimeStub* generate_throw_exception(StubId id, address runtime_entry); 88 public: 89 static void generate_initial_stubs(void); 90 static void generate_stubs(void); 91 #if INCLUDE_JFR 92 static void generate_jfr_stubs(void); 93 // For c2: c_rarg0 is junk, call to runtime to write a checkpoint. 94 // It returns a jobject handle to the event writer. 95 // The handle is dereferenced and the return value is the event writer oop. 96 static RuntimeStub* generate_jfr_write_checkpoint(); 97 // For c2: call to runtime to return a buffer lease. 98 static RuntimeStub* generate_jfr_return_lease(); 99 #endif 100 static void init_adapter_library(); 101 102 static const char *stub_name(StubId id) { 103 assert(StubInfo::is_shared(id), "not a shared stub %s", StubInfo::name(id)); 104 return StubInfo::name(id); 105 } 106 107 // max bytes for each dtrace string parameter 108 enum { max_dtrace_string_size = 256 }; 109 110 // The following arithmetic routines are used on platforms that do 111 // not have machine instructions to implement their functionality. 112 // Do not remove these. 113 114 // long arithmetics 115 static jlong lmul(jlong y, jlong x); 116 static jlong ldiv(jlong y, jlong x); 117 static jlong lrem(jlong y, jlong x); 118 119 // float and double remainder 120 static jfloat frem(jfloat x, jfloat y); 121 static jdouble drem(jdouble x, jdouble y); 122 123 124 #ifdef _WIN64 125 // Workaround for fmod issue in the Windows x64 CRT 126 static double fmod_winx64(double x, double y); 127 #endif 128 129 #ifdef __SOFTFP__ 130 static jfloat fadd(jfloat x, jfloat y); 131 static jfloat fsub(jfloat x, jfloat y); 132 static jfloat fmul(jfloat x, jfloat y); 133 static jfloat fdiv(jfloat x, jfloat y); 134 135 static jdouble dadd(jdouble x, jdouble y); 136 static jdouble dsub(jdouble x, jdouble y); 137 static jdouble dmul(jdouble x, jdouble y); 138 static jdouble ddiv(jdouble x, jdouble y); 139 #endif // __SOFTFP__ 140 141 // float conversion (needs to set appropriate rounding mode) 142 static jint f2i (jfloat x); 143 static jlong f2l (jfloat x); 144 static jint d2i (jdouble x); 145 static jlong d2l (jdouble x); 146 static jfloat d2f (jdouble x); 147 static jfloat l2f (jlong x); 148 static jdouble l2d (jlong x); 149 static jfloat i2f (jint x); 150 151 #ifdef __SOFTFP__ 152 static jdouble i2d (jint x); 153 static jdouble f2d (jfloat x); 154 #endif // __SOFTFP__ 155 156 // double trigonometrics and transcendentals 157 static jdouble dsin(jdouble x); 158 static jdouble dcos(jdouble x); 159 static jdouble dtan(jdouble x); 160 static jdouble dlog(jdouble x); 161 static jdouble dlog10(jdouble x); 162 static jdouble dexp(jdouble x); 163 static jdouble dpow(jdouble x, jdouble y); 164 165 #if defined(__SOFTFP__) || defined(E500V2) 166 static double dabs(double f); 167 #endif 168 169 #if defined(__SOFTFP__) 170 static double dsqrt(double f); 171 #endif 172 173 // Montgomery multiplication 174 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 175 jint len, jlong inv, jint *m_ints); 176 static void montgomery_square(jint *a_ints, jint *n_ints, 177 jint len, jlong inv, jint *m_ints); 178 179 #ifdef __SOFTFP__ 180 // C++ compiler generates soft float instructions as well as passing 181 // float and double in registers. 182 static int fcmpl(float x, float y); 183 static int fcmpg(float x, float y); 184 static int dcmpl(double x, double y); 185 static int dcmpg(double x, double y); 186 187 static int unordered_fcmplt(float x, float y); 188 static int unordered_dcmplt(double x, double y); 189 static int unordered_fcmple(float x, float y); 190 static int unordered_dcmple(double x, double y); 191 static int unordered_fcmpge(float x, float y); 192 static int unordered_dcmpge(double x, double y); 193 static int unordered_fcmpgt(float x, float y); 194 static int unordered_dcmpgt(double x, double y); 195 196 static float fneg(float f); 197 static double dneg(double f); 198 #endif 199 200 // exception handling across interpreter/compiler boundaries 201 static address raw_exception_handler_for_return_address(JavaThread* current, address return_address); 202 static address exception_handler_for_return_address(JavaThread* current, address return_address); 203 204 // exception handling and implicit exceptions 205 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 206 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred); 207 enum ImplicitExceptionKind { 208 IMPLICIT_NULL, 209 IMPLICIT_DIVIDE_BY_ZERO, 210 STACK_OVERFLOW 211 }; 212 static void throw_AbstractMethodError(JavaThread* current); 213 static void throw_IncompatibleClassChangeError(JavaThread* current); 214 static void throw_ArithmeticException(JavaThread* current); 215 static void throw_NullPointerException(JavaThread* current); 216 static void throw_NullPointerException_at_call(JavaThread* current); 217 static void throw_StackOverflowError(JavaThread* current); 218 static void throw_delayed_StackOverflowError(JavaThread* current); 219 static void throw_StackOverflowError_common(JavaThread* current, bool delayed); 220 static address continuation_for_implicit_exception(JavaThread* current, 221 address faulting_pc, 222 ImplicitExceptionKind exception_kind); 223 224 // Post-slow-path-allocation, pre-initializing-stores step for 225 // implementing e.g. ReduceInitialCardMarks 226 static void on_slowpath_allocation_exit(JavaThread* current); 227 228 static void enable_stack_reserved_zone(JavaThread* current); 229 static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr); 230 231 // Shared stub locations 232 static address get_poll_stub(address pc); 233 234 static address get_ic_miss_stub() { 235 assert(_ic_miss_blob!= nullptr, "oops"); 236 return _ic_miss_blob->entry_point(); 237 } 238 239 static address get_handle_wrong_method_stub() { 240 assert(_wrong_method_blob!= nullptr, "oops"); 241 return _wrong_method_blob->entry_point(); 242 } 243 244 static address get_handle_wrong_method_abstract_stub() { 245 assert(_wrong_method_abstract_blob!= nullptr, "oops"); 246 return _wrong_method_abstract_blob->entry_point(); 247 } 248 249 static address get_resolve_opt_virtual_call_stub() { 250 assert(_resolve_opt_virtual_call_blob != nullptr, "oops"); 251 return _resolve_opt_virtual_call_blob->entry_point(); 252 } 253 static address get_resolve_virtual_call_stub() { 254 assert(_resolve_virtual_call_blob != nullptr, "oops"); 255 return _resolve_virtual_call_blob->entry_point(); 256 } 257 static address get_resolve_static_call_stub() { 258 assert(_resolve_static_call_blob != nullptr, "oops"); 259 return _resolve_static_call_blob->entry_point(); 260 } 261 262 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 263 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 264 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 265 266 // Implicit exceptions 267 static address throw_AbstractMethodError_entry() { 268 assert(_throw_AbstractMethodError_blob != nullptr, ""); 269 return _throw_AbstractMethodError_blob->entry_point(); 270 } 271 static address throw_IncompatibleClassChangeError_entry() { 272 assert(_throw_IncompatibleClassChangeError_blob != nullptr, ""); 273 return _throw_IncompatibleClassChangeError_blob->entry_point(); 274 } 275 static address throw_NullPointerException_at_call_entry() { 276 assert(_throw_NullPointerException_at_call_blob != nullptr, ""); 277 return _throw_NullPointerException_at_call_blob->entry_point(); 278 } 279 static address throw_StackOverflowError_entry() { 280 assert(_throw_StackOverflowError_blob != nullptr, ""); 281 return _throw_StackOverflowError_blob->entry_point(); 282 } 283 static address throw_delayed_StackOverflowError_entry() { 284 assert(_throw_delayed_StackOverflowError_blob != nullptr, ""); 285 return _throw_delayed_StackOverflowError_blob->entry_point(); 286 } 287 288 #if INCLUDE_JFR 289 static address jfr_write_checkpoint() { 290 assert(_jfr_write_checkpoint_blob != nullptr, ""); 291 return _jfr_write_checkpoint_blob->entry_point(); 292 } 293 static address jfr_return_lease() { 294 assert(_jfr_return_lease_blob != nullptr, ""); 295 return _jfr_return_lease_blob->entry_point(); 296 } 297 #endif 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* current, Handle h_exception); 306 static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = nullptr); 307 308 #if INCLUDE_JVMTI 309 // Functions for JVMTI notifications 310 static void notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current); 311 static void notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current); 312 static void notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current); 313 static void notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current); 314 #endif 315 316 // RedefineClasses() tracing support for obsolete method entry 317 static int rc_trace_method_entry(JavaThread* thread, Method* m); 318 319 // To be used as the entry point for unresolved native methods. 320 static address native_method_throw_unsatisfied_link_error_entry(); 321 322 static void register_finalizer(JavaThread* thread, oopDesc* obj); 323 324 // dtrace notifications 325 static int dtrace_object_alloc(oopDesc* o); 326 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o); 327 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size); 328 static int dtrace_method_entry(JavaThread* thread, Method* m); 329 static int dtrace_method_exit(JavaThread* thread, Method* m); 330 331 // Utility method for retrieving the Java thread id, returns 0 if the 332 // thread is not a well formed Java thread. 333 static jlong get_java_tid(JavaThread* thread); 334 335 336 // used by native wrappers to re-enable yellow if overflow happened in native code 337 static void reguard_yellow_pages(); 338 339 // Fill in the "X cannot be cast to a Y" message for ClassCastException 340 // 341 // @param thr the current thread 342 // @param caster_klass the class of the object we are casting 343 // @return the dynamically allocated exception message (must be freed 344 // by the caller using a resource mark) 345 // 346 // BCP must refer to the current 'checkcast' opcode for the frame 347 // on top of the stack. 348 // The caller (or one of its callers) must use a ResourceMark 349 // in order to correctly free the result. 350 // 351 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass); 352 353 // Fill in the "X cannot be cast to a Y" message for ClassCastException 354 // 355 // @param caster_klass the class of the object we are casting 356 // @param target_klass the target klass attempt 357 // @return the dynamically allocated exception message (must be freed 358 // by the caller using a resource mark) 359 // 360 // This version does not require access the frame, so it can be called 361 // from interpreted code 362 // The caller (or one of it's callers) must use a ResourceMark 363 // in order to correctly free the result. 364 // 365 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr); 366 367 // Resolves a call site- may patch in the destination of the call into the 368 // compiled code. 369 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS); 370 371 private: 372 // deopt blob 373 static void generate_deopt_blob(void); 374 375 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame, 376 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info, 377 bool& needs_ic_stub_refill, TRAPS); 378 379 public: 380 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 381 382 // Resets a call-site in compiled code so it will get resolved again. 383 static methodHandle reresolve_call_site(TRAPS); 384 385 // In the code prolog, if the klass comparison fails, the inline cache 386 // misses and the call site is patched to megamorphic 387 static methodHandle handle_ic_miss_helper(TRAPS); 388 389 // Find the method that called us. 390 static methodHandle find_callee_method(TRAPS); 391 392 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread); 393 394 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current); 395 396 // Issue UL warning for unlocked JNI monitor on virtual thread termination 397 static void log_jni_monitor_still_held(); 398 399 private: 400 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS); 401 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS); 402 403 static Method* extract_attached_method(vframeStream& vfst); 404 405 #if defined(X86) && defined(COMPILER1) 406 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available. 407 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result); 408 #endif // X86 && COMPILER1 409 410 public: 411 412 // Read the array of BasicTypes from a Java signature, and compute where 413 // compiled Java code would like to put the results. Values in reg_lo and 414 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 415 // registers, those above refer to 4-byte stack slots. All stack slots are 416 // based off of the window top. SharedInfo::stack0 refers to the first usable 417 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 418 // 4-bytes higher. 419 // return value is the maximum number of VMReg stack slots the convention will use. 420 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed); 421 422 static void check_member_name_argument_is_last_argument(const methodHandle& method, 423 const BasicType* sig_bt, 424 const VMRegPair* regs) NOT_DEBUG_RETURN; 425 426 // Ditto except for calling C 427 // 428 // C argument in register AND stack slot. 429 // Some architectures require that an argument must be passed in a register 430 // AND in a stack slot. These architectures provide a second VMRegPair array 431 // to be filled by the c_calling_convention method. On other architectures, 432 // null is being passed as the second VMRegPair array, so arguments are either 433 // passed in a register OR in a stack slot. 434 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed); 435 436 static int vector_calling_convention(VMRegPair *regs, 437 uint num_bits, 438 uint total_args_passed); 439 440 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 441 // blobs. Unlike adapters in the tiger and earlier releases the code in these 442 // blobs does not create a new frame and are therefore virtually invisible 443 // to the stack walking code. In general these blobs extend the callers stack 444 // as needed for the conversion of argument locations. 445 446 // When calling a c2i blob the code will always call the interpreter even if 447 // by the time we reach the blob there is compiled code available. This allows 448 // the blob to pass the incoming stack pointer (the sender sp) in a known 449 // location for the interpreter to record. This is used by the frame code 450 // to correct the sender code to match up with the stack pointer when the 451 // thread left the compiled code. In addition it allows the interpreter 452 // to remove the space the c2i adapter allocated to do its argument conversion. 453 454 // Although a c2i blob will always run interpreted even if compiled code is 455 // present if we see that compiled code is present the compiled call site 456 // will be patched/re-resolved so that later calls will run compiled. 457 458 // Additionally a c2i blob need to have a unverified entry because it can be reached 459 // in situations where the call site is an inlined cache site and may go megamorphic. 460 461 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 462 // that the interpreter before it does any call dispatch will record the current 463 // stack pointer in the interpreter frame. On return it will restore the stack 464 // pointer as needed. This means the i2c adapter code doesn't need any special 465 // handshaking path with compiled code to keep the stack walking correct. 466 467 static void generate_i2c2i_adapters(MacroAssembler *_masm, 468 int total_args_passed, 469 int max_arg, 470 const BasicType *sig_bt, 471 const VMRegPair *regs, 472 AdapterHandlerEntry* handler); 473 474 static void gen_i2c_adapter(MacroAssembler *_masm, 475 int total_args_passed, 476 int comp_args_on_stack, 477 const BasicType *sig_bt, 478 const VMRegPair *regs); 479 480 // OSR support 481 482 // OSR_migration_begin will extract the jvm state from an interpreter 483 // frame (locals, monitors) and store the data in a piece of C heap 484 // storage. This then allows the interpreter frame to be removed from the 485 // stack and the OSR nmethod to be called. That method is called with a 486 // pointer to the C heap storage. This pointer is the return value from 487 // OSR_migration_begin. 488 489 static intptr_t* OSR_migration_begin(JavaThread *thread); 490 491 // OSR_migration_end is a trivial routine. It is called after the compiled 492 // method has extracted the jvm state from the C heap that OSR_migration_begin 493 // created. It's entire job is to simply free this storage. 494 static void OSR_migration_end(intptr_t* buf); 495 496 // Convert a sig into a calling convention register layout 497 // and find interesting things about it. 498 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 499 static VMReg name_for_receiver(); 500 501 // "Top of Stack" slots that may be unused by the calling convention but must 502 // otherwise be preserved. 503 // On Intel these are not necessary and the value can be zero. 504 // On Sparc this describes the words reserved for storing a register window 505 // when an interrupt occurs. 506 static uint out_preserve_stack_slots(); 507 508 // Stack slots that may be unused by the calling convention but must 509 // otherwise be preserved. On Intel this includes the return address. 510 // On PowerPC it includes the 4 words holding the old TOC & LR glue. 511 static uint in_preserve_stack_slots(); 512 513 static VMReg thread_register(); 514 515 static void continuation_enter_cleanup(MacroAssembler* masm); 516 517 // Is vector's size (in bytes) bigger than a size saved by default? 518 // For example, on x86 16 bytes XMM registers are saved by default. 519 static bool is_wide_vector(int size); 520 521 // Save and restore a native result 522 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 523 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 524 525 // Generate a native wrapper for a given method. The method takes arguments 526 // in the Java compiled code convention, marshals them to the native 527 // convention (handlizes oops, etc), transitions to native, makes the call, 528 // returns to java state (possibly blocking), unhandlizes any result and 529 // returns. 530 // 531 // The wrapper may contain special-case code if the given method 532 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc. 533 static nmethod* generate_native_wrapper(MacroAssembler* masm, 534 const methodHandle& method, 535 int compile_id, 536 BasicType* sig_bt, 537 VMRegPair* regs, 538 BasicType ret_type); 539 540 // A compiled caller has just called the interpreter, but compiled code 541 // exists. Patch the caller so he no longer calls into the interpreter. 542 static void fixup_callers_callsite(Method* moop, address ret_pc); 543 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 544 545 // Slow-path Locking and Unlocking 546 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current); 547 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current); 548 549 // Resolving of calls 550 static address get_resolved_entry (JavaThread* current, methodHandle callee_method); 551 static address resolve_static_call_C (JavaThread* current); 552 static address resolve_virtual_call_C (JavaThread* current); 553 static address resolve_opt_virtual_call_C(JavaThread* current); 554 555 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 556 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 557 oopDesc* dest, jint dest_pos, 558 jint length, JavaThread* thread); 559 560 // handle ic miss with caller being compiled code 561 // wrong method handling (inline cache misses) 562 static address handle_wrong_method(JavaThread* current); 563 static address handle_wrong_method_abstract(JavaThread* current); 564 static address handle_wrong_method_ic_miss(JavaThread* current); 565 566 static address handle_unsafe_access(JavaThread* thread, address next_pc); 567 568 #ifndef PRODUCT 569 570 // Collect and print inline cache miss statistics 571 private: 572 enum { maxICmiss_count = 100 }; 573 static int _ICmiss_index; // length of IC miss histogram 574 static int _ICmiss_count[maxICmiss_count]; // miss counts 575 static address _ICmiss_at[maxICmiss_count]; // miss addresses 576 static void trace_ic_miss(address at); 577 578 public: 579 static uint _ic_miss_ctr; // total # of IC misses 580 static uint _wrong_method_ctr; 581 static uint _resolve_static_ctr; 582 static uint _resolve_virtual_ctr; 583 static uint _resolve_opt_virtual_ctr; 584 static uint _implicit_null_throws; 585 static uint _implicit_div0_throws; 586 587 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy 588 static uint _jshort_array_copy_ctr; // Slow-path short array copy 589 static uint _jint_array_copy_ctr; // Slow-path int array copy 590 static uint _jlong_array_copy_ctr; // Slow-path long array copy 591 static uint _oop_array_copy_ctr; // Slow-path oop array copy 592 static uint _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 593 static uint _unsafe_array_copy_ctr; // Slow-path includes alignment checks 594 static uint _generic_array_copy_ctr; // Slow-path includes type decoding 595 static uint _slow_array_copy_ctr; // Slow-path failed out to a method call 596 597 static uint _unsafe_set_memory_ctr; // Slow-path includes alignment checks 598 599 static uint _new_instance_ctr; // 'new' object requires GC 600 static uint _new_array_ctr; // 'new' array requires GC 601 static uint _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 602 static uint _find_handler_ctr; // find exception handler 603 static uint _rethrow_ctr; // rethrow exception 604 static uint _mon_enter_stub_ctr; // monitor enter stub 605 static uint _mon_exit_stub_ctr; // monitor exit stub 606 static uint _mon_enter_ctr; // monitor enter slow 607 static uint _mon_exit_ctr; // monitor exit slow 608 static uint _partial_subtype_ctr; // SubRoutines::partial_subtype_check 609 610 // Statistics code 611 // stats for "normal" compiled calls (non-interface) 612 static int64_t _nof_normal_calls; // total # of calls 613 static int64_t _nof_inlined_calls; // total # of inlined normal calls 614 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 615 static int64_t _nof_inlined_static_calls; // total # of inlined static calls 616 // stats for compiled interface calls 617 static int64_t _nof_interface_calls; // total # of compiled calls 618 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls 619 620 public: // for compiler 621 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 622 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 623 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 624 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 625 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 626 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 627 static void print_call_statistics(uint64_t comp_total); 628 static void print_ic_miss_histogram(); 629 630 #endif // PRODUCT 631 632 static void print_statistics() PRODUCT_RETURN; 633 }; 634 635 636 // --------------------------------------------------------------------------- 637 // Implementation of AdapterHandlerLibrary 638 // 639 // This library manages argument marshaling adapters and native wrappers. 640 // There are 2 flavors of adapters: I2C and C2I. 641 // 642 // The I2C flavor takes a stock interpreted call setup, marshals the 643 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 644 // code_begin(). It is broken to call it without an nmethod assigned. 645 // The usual behavior is to lift any register arguments up out of the 646 // stack and possibly re-pack the extra arguments to be contiguous. 647 // I2C adapters will save what the interpreter's stack pointer will be 648 // after arguments are popped, then adjust the interpreter's frame 649 // size to force alignment and possibly to repack the arguments. 650 // After re-packing, it jumps to the compiled code start. There are 651 // no safepoints in this adapter code and a GC cannot happen while 652 // marshaling is in progress. 653 // 654 // The C2I flavor takes a stock compiled call setup plus the target method in 655 // Rmethod, marshals the arguments for an interpreted call and jumps to 656 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 657 // setup. Compiled frames are fixed-size and the args are likely not in the 658 // right place. Hence all the args will likely be copied into the 659 // interpreter's frame, forcing that frame to grow. The compiled frame's 660 // outgoing stack args will be dead after the copy. 661 // 662 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 663 // also perform an official frame push & pop. They have a call to the native 664 // routine in their middles and end in a return (instead of ending in a jump). 665 // The native wrappers are stored in real nmethods instead of the BufferBlobs 666 // used by the adapters. The code generation happens here because it's very 667 // similar to what the adapters have to do. 668 669 class AdapterHandlerEntry : public MetaspaceObj { 670 friend class AdapterHandlerLibrary; 671 672 public: 673 static const int ENTRIES_COUNT = 4; 674 675 private: 676 AdapterFingerPrint* _fingerprint; 677 address _i2c_entry; 678 address _c2i_entry; 679 address _c2i_unverified_entry; 680 address _c2i_no_clinit_check_entry; 681 bool _linked; 682 683 static const char *_entry_names[]; 684 685 #ifdef ASSERT 686 // Captures code and signature used to generate this adapter when 687 // verifying adapter equivalence. 688 unsigned char* _saved_code; 689 int _saved_code_length; 690 #endif 691 692 AdapterHandlerEntry(AdapterFingerPrint* fingerprint) : 693 _fingerprint(fingerprint), 694 _i2c_entry(nullptr), 695 _c2i_entry(nullptr), 696 _c2i_unverified_entry(nullptr), 697 _c2i_no_clinit_check_entry(nullptr), 698 _linked(false) 699 #ifdef ASSERT 700 , _saved_code(nullptr), 701 _saved_code_length(0) 702 #endif 703 { } 704 705 ~AdapterHandlerEntry(); 706 707 // Allocate on CHeap instead of metaspace (see JDK-8331086). 708 // Dummy argument is used to avoid C++ warning about using 709 // deleted opearator MetaspaceObj::delete(). 710 void* operator new(size_t size, size_t dummy) throw() { 711 assert(size == BytesPerWord * heap_word_size(sizeof(AdapterHandlerEntry)), "should match"); 712 void* p = AllocateHeap(size, mtCode); 713 memset(p, 0, size); 714 return p; 715 } 716 717 public: 718 static AdapterHandlerEntry* allocate(AdapterFingerPrint* fingerprint) { 719 return new(0) AdapterHandlerEntry(fingerprint); 720 } 721 722 static void deallocate(AdapterHandlerEntry *handler) { 723 handler->~AdapterHandlerEntry(); 724 } 725 726 void set_entry_points(address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry, bool linked = true) { 727 _i2c_entry = i2c_entry; 728 _c2i_entry = c2i_entry; 729 _c2i_unverified_entry = c2i_unverified_entry; 730 _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry; 731 _linked = linked; 732 } 733 734 address get_i2c_entry() const { return _i2c_entry; } 735 address get_c2i_entry() const { return _c2i_entry; } 736 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 737 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; } 738 739 static const char* entry_name(int i) { 740 assert(i >=0 && i < ENTRIES_COUNT, "entry id out of range"); 741 return _entry_names[i]; 742 } 743 744 bool is_linked() const { return _linked; } 745 address base_address(); 746 void relocate(address new_base); 747 748 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 749 750 #ifdef ASSERT 751 // Used to verify that code generated for shared adapters is equivalent 752 void save_code (unsigned char* code, int length); 753 bool compare_code(AdapterHandlerEntry* other); 754 #endif 755 756 //virtual void print_on(outputStream* st) const; DO NOT USE 757 void print_adapter_on(outputStream* st) const; 758 759 void metaspace_pointers_do(MetaspaceClosure* it); 760 int size() const {return (int)heap_word_size(sizeof(AdapterHandlerEntry)); } 761 MetaspaceObj::Type type() const { return AdapterHandlerEntryType; } 762 763 void remove_unshareable_info() NOT_CDS_RETURN; 764 void link() NOT_CDS_RETURN; 765 }; 766 767 #if INCLUDE_CDS 768 class ArchivedAdapterTable; 769 #endif // INCLUDE_CDS 770 771 class AdapterHandlerLibrary: public AllStatic { 772 friend class SharedRuntime; 773 private: 774 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 775 static AdapterHandlerEntry* _abstract_method_handler; 776 static AdapterHandlerEntry* _no_arg_handler; 777 static AdapterHandlerEntry* _int_arg_handler; 778 static AdapterHandlerEntry* _obj_arg_handler; 779 static AdapterHandlerEntry* _obj_int_arg_handler; 780 static AdapterHandlerEntry* _obj_obj_arg_handler; 781 #if INCLUDE_CDS 782 static ArchivedAdapterTable _aot_adapter_handler_table; 783 #endif // INCLUDE_CDS 784 785 static BufferBlob* buffer_blob(); 786 static void initialize(); 787 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method); 788 static AdapterBlob* lookup_aot_cache(AdapterHandlerEntry* handler); 789 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter, 790 int total_args_passed, 791 BasicType* sig_bt, 792 bool is_transient = false); 793 static void create_abstract_method_handler(); 794 static void lookup_simple_adapters() NOT_CDS_RETURN; 795 #ifndef PRODUCT 796 static void print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob); 797 #endif // PRODUCT 798 public: 799 800 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint); 801 static void create_native_wrapper(const methodHandle& method); 802 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 803 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt); 804 static bool generate_adapter_code(AdapterBlob*& adapter_blob, 805 AdapterHandlerEntry* handler, 806 int total_args_passed, 807 BasicType* sig_bt, 808 bool is_transient); 809 810 #ifdef ASSERT 811 static void verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached); 812 #endif // ASSERT 813 814 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 815 static void print_handler_on(outputStream* st, const CodeBlob* b); 816 static bool contains(const CodeBlob* b); 817 static const char* name(AdapterFingerPrint* fingerprint); 818 static uint32_t id(AdapterFingerPrint* fingerprint); 819 #ifndef PRODUCT 820 static void print_statistics(); 821 #endif // PRODUCT 822 823 static bool is_abstract_method_adapter(AdapterHandlerEntry* adapter); 824 825 static AdapterBlob* link_aot_adapter_handler(AdapterHandlerEntry* handler) NOT_CDS_RETURN_(nullptr); 826 static void dump_aot_adapter_table() NOT_CDS_RETURN; 827 static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_RETURN; 828 static void link_aot_adapters() NOT_CDS_RETURN; 829 }; 830 831 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP