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 // cont_doYieldStub is not yet folded into the general model for 80 // shared stub/blob handling. It is actually a specially generated 81 // native wrapper for a specific native method, as also is it's 82 // counterpart the continuation do_enter method. 83 static nmethod* _cont_doYield_stub; 84 85 #ifndef PRODUCT 86 // Counters 87 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 88 #endif // !PRODUCT 89 90 private: 91 static SafepointBlob* generate_handler_blob(StubId id, address call_ptr); 92 static RuntimeStub* generate_resolve_blob(StubId id, address destination); 93 static RuntimeStub* generate_throw_exception(StubId id, address runtime_entry); 94 public: 95 static void generate_initial_stubs(void); 96 static void generate_stubs(void); 97 #if INCLUDE_JFR 98 static void generate_jfr_stubs(void); 99 // For c2: c_rarg0 is junk, call to runtime to write a checkpoint. 100 // It returns a jobject handle to the event writer. 101 // The handle is dereferenced and the return value is the event writer oop. 102 static RuntimeStub* generate_jfr_write_checkpoint(); 103 // For c2: call to runtime to return a buffer lease. 104 static RuntimeStub* generate_jfr_return_lease(); 105 #endif 106 static void init_adapter_library(); 107 108 static const char *stub_name(StubId id) { 109 assert(StubInfo::is_shared(id), "not a shared stub %s", StubInfo::name(id)); 110 return StubInfo::name(id); 111 } 112 113 // max bytes for each dtrace string parameter 114 enum { max_dtrace_string_size = 256 }; 115 116 // The following arithmetic routines are used on platforms that do 117 // not have machine instructions to implement their functionality. 118 // Do not remove these. 119 120 // long arithmetics 121 static jlong lmul(jlong y, jlong x); 122 static jlong ldiv(jlong y, jlong x); 123 static jlong lrem(jlong y, jlong x); 124 125 // float and double remainder 126 static jfloat frem(jfloat x, jfloat y); 127 static jdouble drem(jdouble x, jdouble y); 128 129 130 #ifdef _WIN64 131 // Workaround for fmod issue in the Windows x64 CRT 132 static double fmod_winx64(double x, double y); 133 #endif 134 135 #ifdef __SOFTFP__ 136 static jfloat fadd(jfloat x, jfloat y); 137 static jfloat fsub(jfloat x, jfloat y); 138 static jfloat fmul(jfloat x, jfloat y); 139 static jfloat fdiv(jfloat x, jfloat y); 140 141 static jdouble dadd(jdouble x, jdouble y); 142 static jdouble dsub(jdouble x, jdouble y); 143 static jdouble dmul(jdouble x, jdouble y); 144 static jdouble ddiv(jdouble x, jdouble y); 145 #endif // __SOFTFP__ 146 147 // float conversion (needs to set appropriate rounding mode) 148 static jint f2i (jfloat x); 149 static jlong f2l (jfloat x); 150 static jint d2i (jdouble x); 151 static jlong d2l (jdouble x); 152 static jfloat d2f (jdouble x); 153 static jfloat l2f (jlong x); 154 static jdouble l2d (jlong x); 155 static jfloat i2f (jint x); 156 157 #ifdef __SOFTFP__ 158 static jdouble i2d (jint x); 159 static jdouble f2d (jfloat x); 160 #endif // __SOFTFP__ 161 162 // double trigonometrics and transcendentals 163 static jdouble dsin(jdouble x); 164 static jdouble dcos(jdouble x); 165 static jdouble dtan(jdouble x); 166 static jdouble dlog(jdouble x); 167 static jdouble dlog10(jdouble x); 168 static jdouble dexp(jdouble x); 169 static jdouble dpow(jdouble x, jdouble y); 170 171 #if defined(__SOFTFP__) || defined(E500V2) 172 static double dabs(double f); 173 #endif 174 175 #if defined(__SOFTFP__) 176 static double dsqrt(double f); 177 #endif 178 179 // Montgomery multiplication 180 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 181 jint len, jlong inv, jint *m_ints); 182 static void montgomery_square(jint *a_ints, jint *n_ints, 183 jint len, jlong inv, jint *m_ints); 184 185 #ifdef __SOFTFP__ 186 // C++ compiler generates soft float instructions as well as passing 187 // float and double in registers. 188 static int fcmpl(float x, float y); 189 static int fcmpg(float x, float y); 190 static int dcmpl(double x, double y); 191 static int dcmpg(double x, double y); 192 193 static int unordered_fcmplt(float x, float y); 194 static int unordered_dcmplt(double x, double y); 195 static int unordered_fcmple(float x, float y); 196 static int unordered_dcmple(double x, double y); 197 static int unordered_fcmpge(float x, float y); 198 static int unordered_dcmpge(double x, double y); 199 static int unordered_fcmpgt(float x, float y); 200 static int unordered_dcmpgt(double x, double y); 201 202 static float fneg(float f); 203 static double dneg(double f); 204 #endif 205 206 // exception handling across interpreter/compiler boundaries 207 static address raw_exception_handler_for_return_address(JavaThread* current, address return_address); 208 static address exception_handler_for_return_address(JavaThread* current, address return_address); 209 210 // exception handling and implicit exceptions 211 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 212 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred); 213 enum ImplicitExceptionKind { 214 IMPLICIT_NULL, 215 IMPLICIT_DIVIDE_BY_ZERO, 216 STACK_OVERFLOW 217 }; 218 static void throw_AbstractMethodError(JavaThread* current); 219 static void throw_IncompatibleClassChangeError(JavaThread* current); 220 static void throw_ArithmeticException(JavaThread* current); 221 static void throw_NullPointerException(JavaThread* current); 222 static void throw_NullPointerException_at_call(JavaThread* current); 223 static void throw_StackOverflowError(JavaThread* current); 224 static void throw_delayed_StackOverflowError(JavaThread* current); 225 static void throw_StackOverflowError_common(JavaThread* current, bool delayed); 226 static address continuation_for_implicit_exception(JavaThread* current, 227 address faulting_pc, 228 ImplicitExceptionKind exception_kind); 229 230 // Post-slow-path-allocation, pre-initializing-stores step for 231 // implementing e.g. ReduceInitialCardMarks 232 static void on_slowpath_allocation_exit(JavaThread* current); 233 234 static void enable_stack_reserved_zone(JavaThread* current); 235 static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr); 236 237 // Shared stub locations 238 static address get_poll_stub(address pc); 239 240 static address get_ic_miss_stub() { 241 assert(_ic_miss_blob!= nullptr, "oops"); 242 return _ic_miss_blob->entry_point(); 243 } 244 245 static address get_handle_wrong_method_stub() { 246 assert(_wrong_method_blob!= nullptr, "oops"); 247 return _wrong_method_blob->entry_point(); 248 } 249 250 static address get_handle_wrong_method_abstract_stub() { 251 assert(_wrong_method_abstract_blob!= nullptr, "oops"); 252 return _wrong_method_abstract_blob->entry_point(); 253 } 254 255 static address get_resolve_opt_virtual_call_stub() { 256 assert(_resolve_opt_virtual_call_blob != nullptr, "oops"); 257 return _resolve_opt_virtual_call_blob->entry_point(); 258 } 259 static address get_resolve_virtual_call_stub() { 260 assert(_resolve_virtual_call_blob != nullptr, "oops"); 261 return _resolve_virtual_call_blob->entry_point(); 262 } 263 static address get_resolve_static_call_stub() { 264 assert(_resolve_static_call_blob != nullptr, "oops"); 265 return _resolve_static_call_blob->entry_point(); 266 } 267 268 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 269 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 270 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 271 272 static nmethod* cont_doYield_stub() { 273 assert(_cont_doYield_stub != nullptr, "oops"); 274 return _cont_doYield_stub; 275 } 276 277 // Implicit exceptions 278 static address throw_AbstractMethodError_entry() { 279 assert(_throw_AbstractMethodError_blob != nullptr, ""); 280 return _throw_AbstractMethodError_blob->entry_point(); 281 } 282 static address throw_IncompatibleClassChangeError_entry() { 283 assert(_throw_IncompatibleClassChangeError_blob != nullptr, ""); 284 return _throw_IncompatibleClassChangeError_blob->entry_point(); 285 } 286 static address throw_NullPointerException_at_call_entry() { 287 assert(_throw_NullPointerException_at_call_blob != nullptr, ""); 288 return _throw_NullPointerException_at_call_blob->entry_point(); 289 } 290 static address throw_StackOverflowError_entry() { 291 assert(_throw_StackOverflowError_blob != nullptr, ""); 292 return _throw_StackOverflowError_blob->entry_point(); 293 } 294 static address throw_delayed_StackOverflowError_entry() { 295 assert(_throw_delayed_StackOverflowError_blob != nullptr, ""); 296 return _throw_delayed_StackOverflowError_blob->entry_point(); 297 } 298 299 #if INCLUDE_JFR 300 static address jfr_write_checkpoint() { 301 assert(_jfr_write_checkpoint_blob != nullptr, ""); 302 return _jfr_write_checkpoint_blob->entry_point(); 303 } 304 static address jfr_return_lease() { 305 assert(_jfr_return_lease_blob != nullptr, ""); 306 return _jfr_return_lease_blob->entry_point(); 307 } 308 #endif 309 310 // Counters 311 #ifndef PRODUCT 312 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 313 #endif // PRODUCT 314 315 // Helper routine for full-speed JVMTI exception throwing support 316 static void throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception); 317 static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = nullptr); 318 319 #if INCLUDE_JVMTI 320 // Functions for JVMTI notifications 321 static void notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current); 322 static void notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current); 323 static void notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current); 324 static void notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current); 325 #endif 326 327 // RedefineClasses() tracing support for obsolete method entry 328 static int rc_trace_method_entry(JavaThread* thread, Method* m); 329 330 // To be used as the entry point for unresolved native methods. 331 static address native_method_throw_unsatisfied_link_error_entry(); 332 333 static void register_finalizer(JavaThread* thread, oopDesc* obj); 334 335 // dtrace notifications 336 static int dtrace_object_alloc(oopDesc* o); 337 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o); 338 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size); 339 static int dtrace_method_entry(JavaThread* thread, Method* m); 340 static int dtrace_method_exit(JavaThread* thread, Method* m); 341 342 // Utility method for retrieving the Java thread id, returns 0 if the 343 // thread is not a well formed Java thread. 344 static jlong get_java_tid(JavaThread* thread); 345 346 347 // used by native wrappers to re-enable yellow if overflow happened in native code 348 static void reguard_yellow_pages(); 349 350 // Fill in the "X cannot be cast to a Y" message for ClassCastException 351 // 352 // @param thr the current thread 353 // @param caster_klass the class of the object we are casting 354 // @return the dynamically allocated exception message (must be freed 355 // by the caller using a resource mark) 356 // 357 // BCP must refer to the current 'checkcast' opcode for the frame 358 // on top of the stack. 359 // The caller (or one of its callers) must use a ResourceMark 360 // in order to correctly free the result. 361 // 362 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass); 363 364 // Fill in the "X cannot be cast to a Y" message for ClassCastException 365 // 366 // @param caster_klass the class of the object we are casting 367 // @param target_klass the target klass attempt 368 // @return the dynamically allocated exception message (must be freed 369 // by the caller using a resource mark) 370 // 371 // This version does not require access the frame, so it can be called 372 // from interpreted code 373 // The caller (or one of it's callers) must use a ResourceMark 374 // in order to correctly free the result. 375 // 376 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr); 377 378 // Resolves a call site- may patch in the destination of the call into the 379 // compiled code. 380 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS); 381 382 private: 383 // deopt blob 384 static void generate_deopt_blob(void); 385 386 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame, 387 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info, 388 bool& needs_ic_stub_refill, TRAPS); 389 390 public: 391 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 392 393 // Resets a call-site in compiled code so it will get resolved again. 394 static methodHandle reresolve_call_site(TRAPS); 395 396 // In the code prolog, if the klass comparison fails, the inline cache 397 // misses and the call site is patched to megamorphic 398 static methodHandle handle_ic_miss_helper(TRAPS); 399 400 // Find the method that called us. 401 static methodHandle find_callee_method(TRAPS); 402 403 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread); 404 405 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current); 406 407 // Issue UL warning for unlocked JNI monitor on virtual thread termination 408 static void log_jni_monitor_still_held(); 409 410 private: 411 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS); 412 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS); 413 414 static Method* extract_attached_method(vframeStream& vfst); 415 416 #if defined(X86) && defined(COMPILER1) 417 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available. 418 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result); 419 #endif // X86 && COMPILER1 420 421 public: 422 423 // Read the array of BasicTypes from a Java signature, and compute where 424 // compiled Java code would like to put the results. Values in reg_lo and 425 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 426 // registers, those above refer to 4-byte stack slots. All stack slots are 427 // based off of the window top. SharedInfo::stack0 refers to the first usable 428 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 429 // 4-bytes higher. 430 // return value is the maximum number of VMReg stack slots the convention will use. 431 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed); 432 433 static void check_member_name_argument_is_last_argument(const methodHandle& method, 434 const BasicType* sig_bt, 435 const VMRegPair* regs) NOT_DEBUG_RETURN; 436 437 // Ditto except for calling C 438 // 439 // C argument in register AND stack slot. 440 // Some architectures require that an argument must be passed in a register 441 // AND in a stack slot. These architectures provide a second VMRegPair array 442 // to be filled by the c_calling_convention method. On other architectures, 443 // null is being passed as the second VMRegPair array, so arguments are either 444 // passed in a register OR in a stack slot. 445 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed); 446 447 static int vector_calling_convention(VMRegPair *regs, 448 uint num_bits, 449 uint total_args_passed); 450 451 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 452 // blobs. Unlike adapters in the tiger and earlier releases the code in these 453 // blobs does not create a new frame and are therefore virtually invisible 454 // to the stack walking code. In general these blobs extend the callers stack 455 // as needed for the conversion of argument locations. 456 457 // When calling a c2i blob the code will always call the interpreter even if 458 // by the time we reach the blob there is compiled code available. This allows 459 // the blob to pass the incoming stack pointer (the sender sp) in a known 460 // location for the interpreter to record. This is used by the frame code 461 // to correct the sender code to match up with the stack pointer when the 462 // thread left the compiled code. In addition it allows the interpreter 463 // to remove the space the c2i adapter allocated to do its argument conversion. 464 465 // Although a c2i blob will always run interpreted even if compiled code is 466 // present if we see that compiled code is present the compiled call site 467 // will be patched/re-resolved so that later calls will run compiled. 468 469 // Additionally a c2i blob need to have a unverified entry because it can be reached 470 // in situations where the call site is an inlined cache site and may go megamorphic. 471 472 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 473 // that the interpreter before it does any call dispatch will record the current 474 // stack pointer in the interpreter frame. On return it will restore the stack 475 // pointer as needed. This means the i2c adapter code doesn't need any special 476 // handshaking path with compiled code to keep the stack walking correct. 477 478 static void generate_i2c2i_adapters(MacroAssembler *_masm, 479 int total_args_passed, 480 int max_arg, 481 const BasicType *sig_bt, 482 const VMRegPair *regs, 483 AdapterHandlerEntry* handler); 484 485 static void gen_i2c_adapter(MacroAssembler *_masm, 486 int total_args_passed, 487 int comp_args_on_stack, 488 const BasicType *sig_bt, 489 const VMRegPair *regs); 490 491 // OSR support 492 493 // OSR_migration_begin will extract the jvm state from an interpreter 494 // frame (locals, monitors) and store the data in a piece of C heap 495 // storage. This then allows the interpreter frame to be removed from the 496 // stack and the OSR nmethod to be called. That method is called with a 497 // pointer to the C heap storage. This pointer is the return value from 498 // OSR_migration_begin. 499 500 static intptr_t* OSR_migration_begin(JavaThread *thread); 501 502 // OSR_migration_end is a trivial routine. It is called after the compiled 503 // method has extracted the jvm state from the C heap that OSR_migration_begin 504 // created. It's entire job is to simply free this storage. 505 static void OSR_migration_end(intptr_t* buf); 506 507 // Convert a sig into a calling convention register layout 508 // and find interesting things about it. 509 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 510 static VMReg name_for_receiver(); 511 512 // "Top of Stack" slots that may be unused by the calling convention but must 513 // otherwise be preserved. 514 // On Intel these are not necessary and the value can be zero. 515 // On Sparc this describes the words reserved for storing a register window 516 // when an interrupt occurs. 517 static uint out_preserve_stack_slots(); 518 519 // Stack slots that may be unused by the calling convention but must 520 // otherwise be preserved. On Intel this includes the return address. 521 // On PowerPC it includes the 4 words holding the old TOC & LR glue. 522 static uint in_preserve_stack_slots(); 523 524 static VMReg thread_register(); 525 526 static void continuation_enter_cleanup(MacroAssembler* masm); 527 528 // Is vector's size (in bytes) bigger than a size saved by default? 529 // For example, on x86 16 bytes XMM registers are saved by default. 530 static bool is_wide_vector(int size); 531 532 // Save and restore a native result 533 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 534 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 535 536 // Generate a native wrapper for a given method. The method takes arguments 537 // in the Java compiled code convention, marshals them to the native 538 // convention (handlizes oops, etc), transitions to native, makes the call, 539 // returns to java state (possibly blocking), unhandlizes any result and 540 // returns. 541 // 542 // The wrapper may contain special-case code if the given method 543 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc. 544 static nmethod* generate_native_wrapper(MacroAssembler* masm, 545 const methodHandle& method, 546 int compile_id, 547 BasicType* sig_bt, 548 VMRegPair* regs, 549 BasicType ret_type); 550 551 // A compiled caller has just called the interpreter, but compiled code 552 // exists. Patch the caller so he no longer calls into the interpreter. 553 static void fixup_callers_callsite(Method* moop, address ret_pc); 554 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 555 556 // Slow-path Locking and Unlocking 557 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current); 558 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current); 559 560 // Resolving of calls 561 static address get_resolved_entry (JavaThread* current, methodHandle callee_method); 562 static address resolve_static_call_C (JavaThread* current); 563 static address resolve_virtual_call_C (JavaThread* current); 564 static address resolve_opt_virtual_call_C(JavaThread* current); 565 566 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 567 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 568 oopDesc* dest, jint dest_pos, 569 jint length, JavaThread* thread); 570 571 // handle ic miss with caller being compiled code 572 // wrong method handling (inline cache misses) 573 static address handle_wrong_method(JavaThread* current); 574 static address handle_wrong_method_abstract(JavaThread* current); 575 static address handle_wrong_method_ic_miss(JavaThread* current); 576 577 static address handle_unsafe_access(JavaThread* thread, address next_pc); 578 579 #ifndef PRODUCT 580 581 // Collect and print inline cache miss statistics 582 private: 583 enum { maxICmiss_count = 100 }; 584 static int _ICmiss_index; // length of IC miss histogram 585 static int _ICmiss_count[maxICmiss_count]; // miss counts 586 static address _ICmiss_at[maxICmiss_count]; // miss addresses 587 static void trace_ic_miss(address at); 588 589 public: 590 static uint _ic_miss_ctr; // total # of IC misses 591 static uint _wrong_method_ctr; 592 static uint _resolve_static_ctr; 593 static uint _resolve_virtual_ctr; 594 static uint _resolve_opt_virtual_ctr; 595 static uint _implicit_null_throws; 596 static uint _implicit_div0_throws; 597 598 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy 599 static uint _jshort_array_copy_ctr; // Slow-path short array copy 600 static uint _jint_array_copy_ctr; // Slow-path int array copy 601 static uint _jlong_array_copy_ctr; // Slow-path long array copy 602 static uint _oop_array_copy_ctr; // Slow-path oop array copy 603 static uint _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 604 static uint _unsafe_array_copy_ctr; // Slow-path includes alignment checks 605 static uint _generic_array_copy_ctr; // Slow-path includes type decoding 606 static uint _slow_array_copy_ctr; // Slow-path failed out to a method call 607 608 static uint _unsafe_set_memory_ctr; // Slow-path includes alignment checks 609 610 static uint _new_instance_ctr; // 'new' object requires GC 611 static uint _new_array_ctr; // 'new' array requires GC 612 static uint _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 613 static uint _find_handler_ctr; // find exception handler 614 static uint _rethrow_ctr; // rethrow exception 615 static uint _mon_enter_stub_ctr; // monitor enter stub 616 static uint _mon_exit_stub_ctr; // monitor exit stub 617 static uint _mon_enter_ctr; // monitor enter slow 618 static uint _mon_exit_ctr; // monitor exit slow 619 static uint _partial_subtype_ctr; // SubRoutines::partial_subtype_check 620 621 // Statistics code 622 // stats for "normal" compiled calls (non-interface) 623 static int64_t _nof_normal_calls; // total # of calls 624 static int64_t _nof_inlined_calls; // total # of inlined normal calls 625 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 626 static int64_t _nof_inlined_static_calls; // total # of inlined static calls 627 // stats for compiled interface calls 628 static int64_t _nof_interface_calls; // total # of compiled calls 629 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls 630 631 public: // for compiler 632 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 633 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 634 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 635 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 636 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 637 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 638 static void print_call_statistics(uint64_t comp_total); 639 static void print_ic_miss_histogram(); 640 641 #endif // PRODUCT 642 643 static void print_statistics() PRODUCT_RETURN; 644 }; 645 646 647 // --------------------------------------------------------------------------- 648 // Implementation of AdapterHandlerLibrary 649 // 650 // This library manages argument marshaling adapters and native wrappers. 651 // There are 2 flavors of adapters: I2C and C2I. 652 // 653 // The I2C flavor takes a stock interpreted call setup, marshals the 654 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 655 // code_begin(). It is broken to call it without an nmethod assigned. 656 // The usual behavior is to lift any register arguments up out of the 657 // stack and possibly re-pack the extra arguments to be contiguous. 658 // I2C adapters will save what the interpreter's stack pointer will be 659 // after arguments are popped, then adjust the interpreter's frame 660 // size to force alignment and possibly to repack the arguments. 661 // After re-packing, it jumps to the compiled code start. There are 662 // no safepoints in this adapter code and a GC cannot happen while 663 // marshaling is in progress. 664 // 665 // The C2I flavor takes a stock compiled call setup plus the target method in 666 // Rmethod, marshals the arguments for an interpreted call and jumps to 667 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 668 // setup. Compiled frames are fixed-size and the args are likely not in the 669 // right place. Hence all the args will likely be copied into the 670 // interpreter's frame, forcing that frame to grow. The compiled frame's 671 // outgoing stack args will be dead after the copy. 672 // 673 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 674 // also perform an official frame push & pop. They have a call to the native 675 // routine in their middles and end in a return (instead of ending in a jump). 676 // The native wrappers are stored in real nmethods instead of the BufferBlobs 677 // used by the adapters. The code generation happens here because it's very 678 // similar to what the adapters have to do. 679 680 class AdapterHandlerEntry : public MetaspaceObj { 681 friend class AdapterHandlerLibrary; 682 683 public: 684 static const int ENTRIES_COUNT = 4; 685 686 private: 687 AdapterFingerPrint* _fingerprint; 688 address _i2c_entry; 689 address _c2i_entry; 690 address _c2i_unverified_entry; 691 address _c2i_no_clinit_check_entry; 692 bool _linked; 693 694 static const char *_entry_names[]; 695 696 #ifdef ASSERT 697 // Captures code and signature used to generate this adapter when 698 // verifying adapter equivalence. 699 unsigned char* _saved_code; 700 int _saved_code_length; 701 #endif 702 703 AdapterHandlerEntry(AdapterFingerPrint* fingerprint) : 704 _fingerprint(fingerprint), 705 _i2c_entry(nullptr), 706 _c2i_entry(nullptr), 707 _c2i_unverified_entry(nullptr), 708 _c2i_no_clinit_check_entry(nullptr), 709 _linked(false) 710 #ifdef ASSERT 711 , _saved_code(nullptr), 712 _saved_code_length(0) 713 #endif 714 { } 715 716 ~AdapterHandlerEntry(); 717 718 // Allocate on CHeap instead of metaspace (see JDK-8331086). 719 // Dummy argument is used to avoid C++ warning about using 720 // deleted opearator MetaspaceObj::delete(). 721 void* operator new(size_t size, size_t dummy) throw() { 722 assert(size == BytesPerWord * heap_word_size(sizeof(AdapterHandlerEntry)), "should match"); 723 void* p = AllocateHeap(size, mtCode); 724 memset(p, 0, size); 725 return p; 726 } 727 728 public: 729 static AdapterHandlerEntry* allocate(AdapterFingerPrint* fingerprint) { 730 return new(0) AdapterHandlerEntry(fingerprint); 731 } 732 733 static void deallocate(AdapterHandlerEntry *handler) { 734 handler->~AdapterHandlerEntry(); 735 } 736 737 void set_entry_points(address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry, bool linked = true) { 738 _i2c_entry = i2c_entry; 739 _c2i_entry = c2i_entry; 740 _c2i_unverified_entry = c2i_unverified_entry; 741 _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry; 742 _linked = linked; 743 } 744 745 address get_i2c_entry() const { return _i2c_entry; } 746 address get_c2i_entry() const { return _c2i_entry; } 747 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 748 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; } 749 750 static const char* entry_name(int i) { 751 assert(i >=0 && i < ENTRIES_COUNT, "entry id out of range"); 752 return _entry_names[i]; 753 } 754 755 bool is_linked() const { return _linked; } 756 address base_address(); 757 void relocate(address new_base); 758 759 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 760 761 #ifdef ASSERT 762 // Used to verify that code generated for shared adapters is equivalent 763 void save_code (unsigned char* code, int length); 764 bool compare_code(AdapterHandlerEntry* other); 765 #endif 766 767 //virtual void print_on(outputStream* st) const; DO NOT USE 768 void print_adapter_on(outputStream* st) const; 769 770 void metaspace_pointers_do(MetaspaceClosure* it); 771 int size() const {return (int)heap_word_size(sizeof(AdapterHandlerEntry)); } 772 MetaspaceObj::Type type() const { return AdapterHandlerEntryType; } 773 774 void remove_unshareable_info() NOT_CDS_RETURN; 775 void link() NOT_CDS_RETURN; 776 }; 777 778 #if INCLUDE_CDS 779 class ArchivedAdapterTable; 780 #endif // INCLUDE_CDS 781 782 class AdapterHandlerLibrary: public AllStatic { 783 friend class SharedRuntime; 784 private: 785 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 786 static AdapterHandlerEntry* _abstract_method_handler; 787 static AdapterHandlerEntry* _no_arg_handler; 788 static AdapterHandlerEntry* _int_arg_handler; 789 static AdapterHandlerEntry* _obj_arg_handler; 790 static AdapterHandlerEntry* _obj_int_arg_handler; 791 static AdapterHandlerEntry* _obj_obj_arg_handler; 792 #if INCLUDE_CDS 793 static ArchivedAdapterTable _aot_adapter_handler_table; 794 #endif // INCLUDE_CDS 795 796 static BufferBlob* buffer_blob(); 797 static void initialize(); 798 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method); 799 static AdapterBlob* lookup_aot_cache(AdapterHandlerEntry* handler); 800 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter, 801 int total_args_passed, 802 BasicType* sig_bt, 803 bool is_transient = false); 804 static void create_abstract_method_handler(); 805 static void lookup_simple_adapters() NOT_CDS_RETURN; 806 #ifndef PRODUCT 807 static void print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob); 808 #endif // PRODUCT 809 public: 810 811 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint); 812 static void create_native_wrapper(const methodHandle& method); 813 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 814 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt); 815 static bool generate_adapter_code(AdapterBlob*& adapter_blob, 816 AdapterHandlerEntry* handler, 817 int total_args_passed, 818 BasicType* sig_bt, 819 bool is_transient); 820 821 #ifdef ASSERT 822 static void verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached); 823 #endif // ASSERT 824 825 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 826 static void print_handler_on(outputStream* st, const CodeBlob* b); 827 static bool contains(const CodeBlob* b); 828 static const char* name(AdapterFingerPrint* fingerprint); 829 static uint32_t id(AdapterFingerPrint* fingerprint); 830 #ifndef PRODUCT 831 static void print_statistics(); 832 #endif // PRODUCT 833 834 static bool is_abstract_method_adapter(AdapterHandlerEntry* adapter); 835 836 static AdapterBlob* link_aot_adapter_handler(AdapterHandlerEntry* handler) NOT_CDS_RETURN_(nullptr); 837 static void dump_aot_adapter_table() NOT_CDS_RETURN; 838 static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_RETURN; 839 static void link_aot_adapters() NOT_CDS_RETURN; 840 }; 841 842 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP