1 /* 2 * Copyright (c) 1997, 2020, 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 // Runtime is the base class for various runtime interfaces 42 // (InterpreterRuntime, CompilerRuntime, etc.). It provides 43 // shared functionality such as exception forwarding (C++ to 44 // Java exceptions), locking/unlocking mechanisms, statistical 45 // information, etc. 46 47 class SharedRuntime: AllStatic { 48 friend class VMStructs; 49 50 private: 51 static methodHandle resolve_sub_helper(JavaThread *thread, 52 bool is_virtual, 53 bool is_optimized, TRAPS); 54 55 // Shared stub locations 56 57 static RuntimeStub* _wrong_method_blob; 58 static RuntimeStub* _wrong_method_abstract_blob; 59 static RuntimeStub* _ic_miss_blob; 60 static RuntimeStub* _resolve_opt_virtual_call_blob; 61 static RuntimeStub* _resolve_virtual_call_blob; 62 static RuntimeStub* _resolve_static_call_blob; 63 static address _resolve_static_call_entry; 64 65 static DeoptimizationBlob* _deopt_blob; 66 67 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob; 68 static SafepointBlob* _polling_page_safepoint_handler_blob; 69 static SafepointBlob* _polling_page_return_handler_blob; 70 71 #ifdef COMPILER2 72 static UncommonTrapBlob* _uncommon_trap_blob; 73 #endif // COMPILER2 74 75 #ifndef PRODUCT 76 // Counters 77 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 78 #endif // !PRODUCT 79 80 private: 81 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP }; 82 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type); 83 static RuntimeStub* generate_resolve_blob(address destination, const char* name); 84 85 public: 86 static void generate_stubs(void); 87 88 // max bytes for each dtrace string parameter 89 enum { max_dtrace_string_size = 256 }; 90 91 // The following arithmetic routines are used on platforms that do 92 // not have machine instructions to implement their functionality. 93 // Do not remove these. 94 95 // long arithmetics 96 static jlong lmul(jlong y, jlong x); 97 static jlong ldiv(jlong y, jlong x); 98 static jlong lrem(jlong y, jlong x); 99 100 // float and double remainder 101 static jfloat frem(jfloat x, jfloat y); 102 static jdouble drem(jdouble x, jdouble y); 103 104 105 #ifdef _WIN64 106 // Workaround for fmod issue in the Windows x64 CRT 107 static double fmod_winx64(double x, double y); 108 #endif 109 110 #ifdef __SOFTFP__ 111 static jfloat fadd(jfloat x, jfloat y); 112 static jfloat fsub(jfloat x, jfloat y); 113 static jfloat fmul(jfloat x, jfloat y); 114 static jfloat fdiv(jfloat x, jfloat y); 115 116 static jdouble dadd(jdouble x, jdouble y); 117 static jdouble dsub(jdouble x, jdouble y); 118 static jdouble dmul(jdouble x, jdouble y); 119 static jdouble ddiv(jdouble x, jdouble y); 120 #endif // __SOFTFP__ 121 122 // float conversion (needs to set appropriate rounding mode) 123 static jint f2i (jfloat x); 124 static jlong f2l (jfloat x); 125 static jint d2i (jdouble x); 126 static jlong d2l (jdouble x); 127 static jfloat d2f (jdouble x); 128 static jfloat l2f (jlong x); 129 static jdouble l2d (jlong x); 130 131 #ifdef __SOFTFP__ 132 static jfloat i2f (jint x); 133 static jdouble i2d (jint x); 134 static jdouble f2d (jfloat x); 135 #endif // __SOFTFP__ 136 137 // double trigonometrics and transcendentals 138 static jdouble dsin(jdouble x); 139 static jdouble dcos(jdouble x); 140 static jdouble dtan(jdouble x); 141 static jdouble dlog(jdouble x); 142 static jdouble dlog10(jdouble x); 143 static jdouble dexp(jdouble x); 144 static jdouble dpow(jdouble x, jdouble y); 145 146 #if defined(__SOFTFP__) || defined(E500V2) 147 static double dabs(double f); 148 #endif 149 150 #if defined(__SOFTFP__) || defined(PPC) 151 static double dsqrt(double f); 152 #endif 153 154 // Montgomery multiplication 155 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 156 jint len, jlong inv, jint *m_ints); 157 static void montgomery_square(jint *a_ints, jint *n_ints, 158 jint len, jlong inv, jint *m_ints); 159 160 #ifdef __SOFTFP__ 161 // C++ compiler generates soft float instructions as well as passing 162 // float and double in registers. 163 static int fcmpl(float x, float y); 164 static int fcmpg(float x, float y); 165 static int dcmpl(double x, double y); 166 static int dcmpg(double x, double y); 167 168 static int unordered_fcmplt(float x, float y); 169 static int unordered_dcmplt(double x, double y); 170 static int unordered_fcmple(float x, float y); 171 static int unordered_dcmple(double x, double y); 172 static int unordered_fcmpge(float x, float y); 173 static int unordered_dcmpge(double x, double y); 174 static int unordered_fcmpgt(float x, float y); 175 static int unordered_dcmpgt(double x, double y); 176 177 static float fneg(float f); 178 static double dneg(double f); 179 #endif 180 181 // exception handling across interpreter/compiler boundaries 182 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 183 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 184 185 // exception handling and implicit exceptions 186 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception, 187 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred); 188 enum ImplicitExceptionKind { 189 IMPLICIT_NULL, 190 IMPLICIT_DIVIDE_BY_ZERO, 191 STACK_OVERFLOW 192 }; 193 static void throw_AbstractMethodError(JavaThread* thread); 194 static void throw_IncompatibleClassChangeError(JavaThread* thread); 195 static void throw_ArithmeticException(JavaThread* thread); 196 static void throw_NullPointerException(JavaThread* thread); 197 static void throw_NullPointerException_at_call(JavaThread* thread); 198 static void throw_StackOverflowError(JavaThread* thread); 199 static void throw_delayed_StackOverflowError(JavaThread* thread); 200 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed); 201 static address continuation_for_implicit_exception(JavaThread* thread, 202 address faulting_pc, 203 ImplicitExceptionKind exception_kind); 204 #if INCLUDE_JVMCI 205 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason); 206 #endif 207 208 // Post-slow-path-allocation, pre-initializing-stores step for 209 // implementing e.g. ReduceInitialCardMarks 210 static void on_slowpath_allocation_exit(JavaThread* thread); 211 212 static void enable_stack_reserved_zone(JavaThread* thread); 213 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr); 214 215 // Shared stub locations 216 static address get_poll_stub(address pc); 217 get_ic_miss_stub()218 static address get_ic_miss_stub() { 219 assert(_ic_miss_blob!= NULL, "oops"); 220 return _ic_miss_blob->entry_point(); 221 } 222 get_handle_wrong_method_stub()223 static address get_handle_wrong_method_stub() { 224 assert(_wrong_method_blob!= NULL, "oops"); 225 return _wrong_method_blob->entry_point(); 226 } 227 get_handle_wrong_method_abstract_stub()228 static address get_handle_wrong_method_abstract_stub() { 229 assert(_wrong_method_abstract_blob!= NULL, "oops"); 230 return _wrong_method_abstract_blob->entry_point(); 231 } 232 233 #ifdef COMPILER2 234 static void generate_uncommon_trap_blob(void); uncommon_trap_blob()235 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 236 #endif // COMPILER2 237 get_resolve_opt_virtual_call_stub()238 static address get_resolve_opt_virtual_call_stub() { 239 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 240 return _resolve_opt_virtual_call_blob->entry_point(); 241 } get_resolve_virtual_call_stub()242 static address get_resolve_virtual_call_stub() { 243 assert(_resolve_virtual_call_blob != NULL, "oops"); 244 return _resolve_virtual_call_blob->entry_point(); 245 } get_resolve_static_call_stub()246 static address get_resolve_static_call_stub() { 247 assert(_resolve_static_call_blob != NULL, "oops"); 248 return _resolve_static_call_blob->entry_point(); 249 } 250 polling_page_return_handler_blob()251 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } polling_page_safepoint_handler_blob()252 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } polling_page_vectors_safepoint_handler_blob()253 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 254 255 // Counters 256 #ifndef PRODUCT nof_megamorphic_calls_addr()257 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 258 #endif // PRODUCT 259 260 // Helper routine for full-speed JVMTI exception throwing support 261 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 262 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 263 264 // RedefineClasses() tracing support for obsolete method entry 265 static int rc_trace_method_entry(JavaThread* thread, Method* m); 266 267 // To be used as the entry point for unresolved native methods. 268 static address native_method_throw_unsatisfied_link_error_entry(); 269 static address native_method_throw_unsupported_operation_exception_entry(); 270 271 static oop retrieve_receiver(Symbol* sig, frame caller); 272 273 static void register_finalizer(JavaThread* thread, oopDesc* obj); 274 275 // dtrace notifications 276 static int dtrace_object_alloc(oopDesc* o, int size); 277 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size); 278 static int dtrace_method_entry(JavaThread* thread, Method* m); 279 static int dtrace_method_exit(JavaThread* thread, Method* m); 280 281 // Utility method for retrieving the Java thread id, returns 0 if the 282 // thread is not a well formed Java thread. 283 static jlong get_java_tid(Thread* thread); 284 285 286 // used by native wrappers to reenable yellow if overflow happened in native code 287 static void reguard_yellow_pages(); 288 289 // Fill in the "X cannot be cast to a Y" message for ClassCastException 290 // 291 // @param thr the current thread 292 // @param caster_klass the class of the object we are casting 293 // @return the dynamically allocated exception message (must be freed 294 // by the caller using a resource mark) 295 // 296 // BCP must refer to the current 'checkcast' opcode for the frame 297 // on top of the stack. 298 // The caller (or one of its callers) must use a ResourceMark 299 // in order to correctly free the result. 300 // 301 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass); 302 303 // Fill in the "X cannot be cast to a Y" message for ClassCastException 304 // 305 // @param caster_klass the class of the object we are casting 306 // @param target_klass the target klass attempt 307 // @return the dynamically allocated exception message (must be freed 308 // by the caller using a resource mark) 309 // 310 // This version does not require access the frame, so it can be called 311 // from interpreted code 312 // The caller (or one of it's callers) must use a ResourceMark 313 // in order to correctly free the result. 314 // 315 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL); 316 317 // Resolves a call site- may patch in the destination of the call into the 318 // compiled code. 319 static methodHandle resolve_helper(JavaThread *thread, 320 bool is_virtual, 321 bool is_optimized, TRAPS); 322 323 private: 324 // deopt blob 325 static void generate_deopt_blob(void); 326 327 public: deopt_blob(void)328 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 329 330 // Resets a call-site in compiled code so it will get resolved again. 331 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 332 333 // In the code prolog, if the klass comparison fails, the inline cache 334 // misses and the call site is patched to megamorphic 335 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 336 337 // Find the method that called us. 338 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 339 340 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread, 341 bool use_inlined_fast_locking); 342 343 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread, 344 bool use_inlined_fast_locking); 345 346 private: 347 static Handle find_callee_info(JavaThread* thread, 348 Bytecodes::Code& bc, 349 CallInfo& callinfo, TRAPS); 350 static Handle find_callee_info_helper(JavaThread* thread, 351 vframeStream& vfst, 352 Bytecodes::Code& bc, 353 CallInfo& callinfo, TRAPS); 354 355 static methodHandle extract_attached_method(vframeStream& vfst); 356 357 static address clean_virtual_call_entry(); 358 static address clean_opt_virtual_call_entry(); 359 static address clean_static_call_entry(); 360 361 #if defined(X86) && defined(COMPILER1) 362 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available. 363 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result); 364 #endif // X86 && COMPILER1 365 366 public: 367 368 // Read the array of BasicTypes from a Java signature, and compute where 369 // compiled Java code would like to put the results. Values in reg_lo and 370 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 371 // registers, those above refer to 4-byte stack slots. All stack slots are 372 // based off of the window top. SharedInfo::stack0 refers to the first usable 373 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 374 // 4-bytes higher. So for sparc because the register window save area is at 375 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 376 // will be just above it. ( 377 // return value is the maximum number of VMReg stack slots the convention will use. 378 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing); 379 380 static void check_member_name_argument_is_last_argument(const methodHandle& method, 381 const BasicType* sig_bt, 382 const VMRegPair* regs) NOT_DEBUG_RETURN; 383 384 // Ditto except for calling C 385 // 386 // C argument in register AND stack slot. 387 // Some architectures require that an argument must be passed in a register 388 // AND in a stack slot. These architectures provide a second VMRegPair array 389 // to be filled by the c_calling_convention method. On other architectures, 390 // NULL is being passed as the second VMRegPair array, so arguments are either 391 // passed in a register OR in a stack slot. 392 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2, 393 int total_args_passed); 394 395 static size_t trampoline_size(); 396 397 static void generate_trampoline(MacroAssembler *masm, address destination); 398 399 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 400 // blobs. Unlike adapters in the tiger and earlier releases the code in these 401 // blobs does not create a new frame and are therefore virtually invisible 402 // to the stack walking code. In general these blobs extend the callers stack 403 // as needed for the conversion of argument locations. 404 405 // When calling a c2i blob the code will always call the interpreter even if 406 // by the time we reach the blob there is compiled code available. This allows 407 // the blob to pass the incoming stack pointer (the sender sp) in a known 408 // location for the interpreter to record. This is used by the frame code 409 // to correct the sender code to match up with the stack pointer when the 410 // thread left the compiled code. In addition it allows the interpreter 411 // to remove the space the c2i adapter allocated to do its argument conversion. 412 413 // Although a c2i blob will always run interpreted even if compiled code is 414 // present if we see that compiled code is present the compiled call site 415 // will be patched/re-resolved so that later calls will run compiled. 416 417 // Additionally a c2i blob need to have a unverified entry because it can be reached 418 // in situations where the call site is an inlined cache site and may go megamorphic. 419 420 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 421 // that the interpreter before it does any call dispatch will record the current 422 // stack pointer in the interpreter frame. On return it will restore the stack 423 // pointer as needed. This means the i2c adapter code doesn't need any special 424 // handshaking path with compiled code to keep the stack walking correct. 425 426 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 427 int total_args_passed, 428 int max_arg, 429 const BasicType *sig_bt, 430 const VMRegPair *regs, 431 AdapterFingerPrint* fingerprint); 432 433 static void gen_i2c_adapter(MacroAssembler *_masm, 434 int total_args_passed, 435 int comp_args_on_stack, 436 const BasicType *sig_bt, 437 const VMRegPair *regs); 438 439 // OSR support 440 441 // OSR_migration_begin will extract the jvm state from an interpreter 442 // frame (locals, monitors) and store the data in a piece of C heap 443 // storage. This then allows the interpreter frame to be removed from the 444 // stack and the OSR nmethod to be called. That method is called with a 445 // pointer to the C heap storage. This pointer is the return value from 446 // OSR_migration_begin. 447 448 static intptr_t* OSR_migration_begin(JavaThread *thread); 449 450 // OSR_migration_end is a trivial routine. It is called after the compiled 451 // method has extracted the jvm state from the C heap that OSR_migration_begin 452 // created. It's entire job is to simply free this storage. 453 static void OSR_migration_end(intptr_t* buf); 454 455 // Convert a sig into a calling convention register layout 456 // and find interesting things about it. 457 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 458 static VMReg name_for_receiver(); 459 460 // "Top of Stack" slots that may be unused by the calling convention but must 461 // otherwise be preserved. 462 // On Intel these are not necessary and the value can be zero. 463 // On Sparc this describes the words reserved for storing a register window 464 // when an interrupt occurs. 465 static uint out_preserve_stack_slots(); 466 467 // Is vector's size (in bytes) bigger than a size saved by default? 468 // For example, on x86 16 bytes XMM registers are saved by default. 469 static bool is_wide_vector(int size); 470 471 // Save and restore a native result 472 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 473 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 474 475 // Generate a native wrapper for a given method. The method takes arguments 476 // in the Java compiled code convention, marshals them to the native 477 // convention (handlizes oops, etc), transitions to native, makes the call, 478 // returns to java state (possibly blocking), unhandlizes any result and 479 // returns. 480 // 481 // The wrapper may contain special-case code if the given method 482 // is a JNI critical method, or a compiled method handle adapter, 483 // such as _invokeBasic, _linkToVirtual, etc. 484 static nmethod* generate_native_wrapper(MacroAssembler* masm, 485 const methodHandle& method, 486 int compile_id, 487 BasicType* sig_bt, 488 VMRegPair* regs, 489 BasicType ret_type, 490 address critical_entry); 491 492 // Block before entering a JNI critical method 493 static void block_for_jni_critical(JavaThread* thread); 494 495 #if INCLUDE_SHENANDOAHGC 496 // Pin/Unpin object 497 static oopDesc* pin_object(JavaThread* thread, oopDesc* obj); 498 static void unpin_object(JavaThread* thread, oopDesc* obj); 499 #endif 500 501 // A compiled caller has just called the interpreter, but compiled code 502 // exists. Patch the caller so he no longer calls into the interpreter. 503 static void fixup_callers_callsite(Method* moop, address ret_pc); 504 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 505 506 // Slow-path Locking and Unlocking 507 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 508 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 509 510 // Resolving of calls 511 static address resolve_static_call_C (JavaThread *thread); 512 static address resolve_virtual_call_C (JavaThread *thread); 513 static address resolve_opt_virtual_call_C(JavaThread *thread); 514 515 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 516 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 517 oopDesc* dest, jint dest_pos, 518 jint length, JavaThread* thread); 519 520 // handle ic miss with caller being compiled code 521 // wrong method handling (inline cache misses, zombie methods) 522 static address handle_wrong_method(JavaThread* thread); 523 static address handle_wrong_method_abstract(JavaThread* thread); 524 static address handle_wrong_method_ic_miss(JavaThread* thread); 525 526 static address handle_unsafe_access(JavaThread* thread, address next_pc); 527 528 #ifndef PRODUCT 529 530 // Collect and print inline cache miss statistics 531 private: 532 enum { maxICmiss_count = 100 }; 533 static int _ICmiss_index; // length of IC miss histogram 534 static int _ICmiss_count[maxICmiss_count]; // miss counts 535 static address _ICmiss_at[maxICmiss_count]; // miss addresses 536 static void trace_ic_miss(address at); 537 538 public: 539 static int _throw_null_ctr; // throwing a null-pointer exception 540 static int _ic_miss_ctr; // total # of IC misses 541 static int _wrong_method_ctr; 542 static int _resolve_static_ctr; 543 static int _resolve_virtual_ctr; 544 static int _resolve_opt_virtual_ctr; 545 static int _implicit_null_throws; 546 static int _implicit_div0_throws; 547 548 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 549 static int _jshort_array_copy_ctr; // Slow-path short array copy 550 static int _jint_array_copy_ctr; // Slow-path int array copy 551 static int _jlong_array_copy_ctr; // Slow-path long array copy 552 static int _oop_array_copy_ctr; // Slow-path oop array copy 553 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 554 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 555 static int _generic_array_copy_ctr; // Slow-path includes type decoding 556 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 557 558 static int _new_instance_ctr; // 'new' object requires GC 559 static int _new_array_ctr; // 'new' array requires GC 560 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 561 static int _find_handler_ctr; // find exception handler 562 static int _rethrow_ctr; // rethrow exception 563 static int _mon_enter_stub_ctr; // monitor enter stub 564 static int _mon_exit_stub_ctr; // monitor exit stub 565 static int _mon_enter_ctr; // monitor enter slow 566 static int _mon_exit_ctr; // monitor exit slow 567 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 568 569 // Statistics code 570 // stats for "normal" compiled calls (non-interface) 571 static int64_t _nof_normal_calls; // total # of calls 572 static int64_t _nof_optimized_calls; // total # of statically-bound calls 573 static int64_t _nof_inlined_calls; // total # of inlined normal calls 574 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 575 static int64_t _nof_inlined_static_calls; // total # of inlined static calls 576 // stats for compiled interface calls 577 static int64_t _nof_interface_calls; // total # of compiled calls 578 static int64_t _nof_optimized_interface_calls; // total # of statically-bound interface calls 579 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls 580 static int64_t _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 581 // stats for runtime exceptions 582 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 583 584 public: // for compiler nof_normal_calls_addr()585 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } nof_optimized_calls_addr()586 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } nof_inlined_calls_addr()587 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } nof_static_calls_addr()588 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } nof_inlined_static_calls_addr()589 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } nof_interface_calls_addr()590 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } nof_optimized_interface_calls_addr()591 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } nof_inlined_interface_calls_addr()592 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } nof_megamorphic_interface_calls_addr()593 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 594 static void print_call_statistics(uint64_t comp_total); 595 static void print_statistics(); 596 static void print_ic_miss_histogram(); 597 598 #endif // PRODUCT 599 }; 600 601 602 // --------------------------------------------------------------------------- 603 // Implementation of AdapterHandlerLibrary 604 // 605 // This library manages argument marshaling adapters and native wrappers. 606 // There are 2 flavors of adapters: I2C and C2I. 607 // 608 // The I2C flavor takes a stock interpreted call setup, marshals the 609 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 610 // code_begin(). It is broken to call it without an nmethod assigned. 611 // The usual behavior is to lift any register arguments up out of the 612 // stack and possibly re-pack the extra arguments to be contiguous. 613 // I2C adapters will save what the interpreter's stack pointer will be 614 // after arguments are popped, then adjust the interpreter's frame 615 // size to force alignment and possibly to repack the arguments. 616 // After re-packing, it jumps to the compiled code start. There are 617 // no safepoints in this adapter code and a GC cannot happen while 618 // marshaling is in progress. 619 // 620 // The C2I flavor takes a stock compiled call setup plus the target method in 621 // Rmethod, marshals the arguments for an interpreted call and jumps to 622 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 623 // setup. Compiled frames are fixed-size and the args are likely not in the 624 // right place. Hence all the args will likely be copied into the 625 // interpreter's frame, forcing that frame to grow. The compiled frame's 626 // outgoing stack args will be dead after the copy. 627 // 628 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 629 // also perform an official frame push & pop. They have a call to the native 630 // routine in their middles and end in a return (instead of ending in a jump). 631 // The native wrappers are stored in real nmethods instead of the BufferBlobs 632 // used by the adapters. The code generation happens here because it's very 633 // similar to what the adapters have to do. 634 635 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 636 friend class AdapterHandlerTable; 637 638 private: 639 AdapterFingerPrint* _fingerprint; 640 address _i2c_entry; 641 address _c2i_entry; 642 address _c2i_unverified_entry; 643 644 #ifdef ASSERT 645 // Captures code and signature used to generate this adapter when 646 // verifying adapter equivalence. 647 unsigned char* _saved_code; 648 int _saved_code_length; 649 #endif 650 init(AdapterFingerPrint * fingerprint,address i2c_entry,address c2i_entry,address c2i_unverified_entry)651 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 652 _fingerprint = fingerprint; 653 _i2c_entry = i2c_entry; 654 _c2i_entry = c2i_entry; 655 _c2i_unverified_entry = c2i_unverified_entry; 656 #ifdef ASSERT 657 _saved_code = NULL; 658 _saved_code_length = 0; 659 #endif 660 } 661 662 void deallocate(); 663 664 // should never be used 665 AdapterHandlerEntry(); 666 667 public: get_i2c_entry() const668 address get_i2c_entry() const { return _i2c_entry; } get_c2i_entry() const669 address get_c2i_entry() const { return _c2i_entry; } get_c2i_unverified_entry() const670 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 671 address base_address(); 672 void relocate(address new_base); 673 fingerprint() const674 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 675 next()676 AdapterHandlerEntry* next() { 677 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 678 } 679 680 #ifdef ASSERT 681 // Used to verify that code generated for shared adapters is equivalent 682 void save_code (unsigned char* code, int length); 683 bool compare_code(unsigned char* code, int length); 684 #endif 685 686 //virtual void print_on(outputStream* st) const; DO NOT USE 687 void print_adapter_on(outputStream* st) const; 688 }; 689 690 // This class is used only with DumpSharedSpaces==true. It holds extra information 691 // that's used only during CDS dump time. 692 // For details, see comments around Method::link_method() 693 class CDSAdapterHandlerEntry: public AdapterHandlerEntry { 694 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region 695 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region 696 697 public: get_c2i_entry_trampoline() const698 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; } get_adapter_trampoline() const699 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; } 700 void init() NOT_CDS_RETURN; 701 }; 702 703 704 class AdapterHandlerLibrary: public AllStatic { 705 private: 706 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 707 static AdapterHandlerTable* _adapters; 708 static AdapterHandlerEntry* _abstract_method_handler; 709 static BufferBlob* buffer_blob(); 710 static void initialize(); 711 static AdapterHandlerEntry* get_adapter0(const methodHandle& method); 712 713 public: 714 715 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 716 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 717 static void create_native_wrapper(const methodHandle& method); 718 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 719 print_handler(const CodeBlob * b)720 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 721 static void print_handler_on(outputStream* st, const CodeBlob* b); 722 static bool contains(const CodeBlob* b); 723 #ifndef PRODUCT 724 static void print_statistics(); 725 #endif // PRODUCT 726 727 }; 728 729 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 730