1 /* 2 * Copyright (c) 1997, 2018, 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 class SigEntry; 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 friend class VMStructs; 50 51 private: 52 static methodHandle resolve_sub_helper(JavaThread *thread, 53 bool is_virtual, 54 bool is_optimized, TRAPS); 55 56 // Shared stub locations 57 58 static RuntimeStub* _wrong_method_blob; 59 static RuntimeStub* _wrong_method_abstract_blob; 60 static RuntimeStub* _ic_miss_blob; 61 static RuntimeStub* _resolve_opt_virtual_call_blob; 62 static RuntimeStub* _resolve_virtual_call_blob; 63 static RuntimeStub* _resolve_static_call_blob; 64 static address _resolve_static_call_entry; 65 66 static DeoptimizationBlob* _deopt_blob; 67 68 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob; 69 static SafepointBlob* _polling_page_safepoint_handler_blob; 70 static SafepointBlob* _polling_page_return_handler_blob; 71 72 #ifdef COMPILER2 73 static UncommonTrapBlob* _uncommon_trap_blob; 74 #endif // COMPILER2 75 76 #ifndef PRODUCT 77 // Counters 78 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 79 #endif // !PRODUCT 80 81 private: 82 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP }; 83 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type); 84 static RuntimeStub* generate_resolve_blob(address destination, const char* name); 85 static RuntimeStub* generate_return_value_blob(address destination, const char* name); 86 public: 87 static void generate_stubs(void); 88 89 // max bytes for each dtrace string parameter 90 enum { max_dtrace_string_size = 256 }; 91 92 // The following arithmetic routines are used on platforms that do 93 // not have machine instructions to implement their functionality. 94 // Do not remove these. 95 96 // long arithmetics 97 static jlong lmul(jlong y, jlong x); 98 static jlong ldiv(jlong y, jlong x); 99 static jlong lrem(jlong y, jlong x); 100 101 // float and double remainder 102 static jfloat frem(jfloat x, jfloat y); 103 static jdouble drem(jdouble x, jdouble y); 104 105 106 #ifdef _WIN64 107 // Workaround for fmod issue in the Windows x64 CRT 108 static double fmod_winx64(double x, double y); 109 #endif 110 111 #ifdef __SOFTFP__ 112 static jfloat fadd(jfloat x, jfloat y); 113 static jfloat fsub(jfloat x, jfloat y); 114 static jfloat fmul(jfloat x, jfloat y); 115 static jfloat fdiv(jfloat x, jfloat y); 116 117 static jdouble dadd(jdouble x, jdouble y); 118 static jdouble dsub(jdouble x, jdouble y); 119 static jdouble dmul(jdouble x, jdouble y); 120 static jdouble ddiv(jdouble x, jdouble y); 121 #endif // __SOFTFP__ 122 123 // float conversion (needs to set appropriate rounding mode) 124 static jint f2i (jfloat x); 125 static jlong f2l (jfloat x); 126 static jint d2i (jdouble x); 127 static jlong d2l (jdouble x); 128 static jfloat d2f (jdouble x); 129 static jfloat l2f (jlong x); 130 static jdouble l2d (jlong x); 131 132 #ifdef __SOFTFP__ 133 static jfloat i2f (jint x); 134 static jdouble i2d (jint x); 135 static jdouble f2d (jfloat x); 136 #endif // __SOFTFP__ 137 138 // double trigonometrics and transcendentals 139 static jdouble dsin(jdouble x); 140 static jdouble dcos(jdouble x); 141 static jdouble dtan(jdouble x); 142 static jdouble dlog(jdouble x); 143 static jdouble dlog10(jdouble x); 144 static jdouble dexp(jdouble x); 145 static jdouble dpow(jdouble x, jdouble y); 146 147 #if defined(__SOFTFP__) || defined(E500V2) 148 static double dabs(double f); 149 #endif 150 151 #if defined(__SOFTFP__) || defined(PPC) 152 static double dsqrt(double f); 153 #endif 154 155 // Montgomery multiplication 156 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 157 jint len, jlong inv, jint *m_ints); 158 static void montgomery_square(jint *a_ints, jint *n_ints, 159 jint len, jlong inv, jint *m_ints); 160 161 #ifdef __SOFTFP__ 162 // C++ compiler generates soft float instructions as well as passing 163 // float and double in registers. 164 static int fcmpl(float x, float y); 165 static int fcmpg(float x, float y); 166 static int dcmpl(double x, double y); 167 static int dcmpg(double x, double y); 168 169 static int unordered_fcmplt(float x, float y); 170 static int unordered_dcmplt(double x, double y); 171 static int unordered_fcmple(float x, float y); 172 static int unordered_dcmple(double x, double y); 173 static int unordered_fcmpge(float x, float y); 174 static int unordered_dcmpge(double x, double y); 175 static int unordered_fcmpgt(float x, float y); 176 static int unordered_dcmpgt(double x, double y); 177 178 static float fneg(float f); 179 static double dneg(double f); 180 #endif 181 182 // exception handling across interpreter/compiler boundaries 183 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 184 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 185 186 // exception handling and implicit exceptions 187 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception, 188 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred); 189 enum ImplicitExceptionKind { 190 IMPLICIT_NULL, 191 IMPLICIT_DIVIDE_BY_ZERO, 192 STACK_OVERFLOW 193 }; 194 static void throw_AbstractMethodError(JavaThread* thread); 195 static void throw_IncompatibleClassChangeError(JavaThread* thread); 196 static void throw_ArithmeticException(JavaThread* thread); 197 static void throw_NullPointerException(JavaThread* thread); 198 static void throw_NullPointerException_at_call(JavaThread* thread); 199 static void throw_StackOverflowError(JavaThread* thread); 200 static void throw_delayed_StackOverflowError(JavaThread* thread); 201 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed); 202 static address continuation_for_implicit_exception(JavaThread* thread, 203 address faulting_pc, 204 ImplicitExceptionKind exception_kind); 205 #if INCLUDE_JVMCI 206 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason); 207 #endif 208 209 // Post-slow-path-allocation, pre-initializing-stores step for 210 // implementing e.g. ReduceInitialCardMarks 211 static void on_slowpath_allocation_exit(JavaThread* thread); 212 213 static void enable_stack_reserved_zone(JavaThread* thread); 214 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr); 215 216 // Shared stub locations 217 static address get_poll_stub(address pc); 218 219 static address get_ic_miss_stub() { 220 assert(_ic_miss_blob!= NULL, "oops"); 221 return _ic_miss_blob->entry_point(); 222 } 223 224 static address get_handle_wrong_method_stub() { 225 assert(_wrong_method_blob!= NULL, "oops"); 226 return _wrong_method_blob->entry_point(); 227 } 228 229 static address get_handle_wrong_method_abstract_stub() { 230 assert(_wrong_method_abstract_blob!= NULL, "oops"); 231 return _wrong_method_abstract_blob->entry_point(); 232 } 233 234 #ifdef COMPILER2 235 static void generate_uncommon_trap_blob(void); 236 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 237 #endif // COMPILER2 238 239 static address get_resolve_opt_virtual_call_stub() { 240 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 241 return _resolve_opt_virtual_call_blob->entry_point(); 242 } 243 static address get_resolve_virtual_call_stub() { 244 assert(_resolve_virtual_call_blob != NULL, "oops"); 245 return _resolve_virtual_call_blob->entry_point(); 246 } 247 static address get_resolve_static_call_stub() { 248 assert(_resolve_static_call_blob != NULL, "oops"); 249 return _resolve_static_call_blob->entry_point(); 250 } 251 252 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 253 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 254 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 255 256 // Counters 257 #ifndef PRODUCT 258 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 259 #endif // PRODUCT 260 261 // Helper routine for full-speed JVMTI exception throwing support 262 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 263 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 264 265 // RedefineClasses() tracing support for obsolete method entry 266 static int rc_trace_method_entry(JavaThread* thread, Method* m); 267 268 // To be used as the entry point for unresolved native methods. 269 static address native_method_throw_unsatisfied_link_error_entry(); 270 static address native_method_throw_unsupported_operation_exception_entry(); 271 272 static oop retrieve_receiver(Symbol* sig, frame caller); 273 274 static void register_finalizer(JavaThread* thread, oopDesc* obj); 275 276 // dtrace notifications 277 static int dtrace_object_alloc(oopDesc* o, int size); 278 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size); 279 static int dtrace_method_entry(JavaThread* thread, Method* m); 280 static int dtrace_method_exit(JavaThread* thread, Method* m); 281 282 // Utility method for retrieving the Java thread id, returns 0 if the 283 // thread is not a well formed Java thread. 284 static jlong get_java_tid(Thread* thread); 285 286 287 // used by native wrappers to reenable yellow if overflow happened in native code 288 static void reguard_yellow_pages(); 289 290 // Fill in the "X cannot be cast to a Y" message for ClassCastException 291 // 292 // @param thr the current thread 293 // @param caster_klass the class of the object we are casting 294 // @return the dynamically allocated exception message (must be freed 295 // by the caller using a resource mark) 296 // 297 // BCP must refer to the current 'checkcast' opcode for the frame 298 // on top of the stack. 299 // The caller (or one of its callers) must use a ResourceMark 300 // in order to correctly free the result. 301 // 302 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass); 303 304 // Fill in the "X cannot be cast to a Y" message for ClassCastException 305 // 306 // @param caster_klass the class of the object we are casting 307 // @param target_klass the target klass attempt 308 // @return the dynamically allocated exception message (must be freed 309 // by the caller using a resource mark) 310 // 311 // This version does not require access the frame, so it can be called 312 // from interpreted code 313 // The caller (or one of it's callers) must use a ResourceMark 314 // in order to correctly free the result. 315 // 316 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL); 317 318 // Resolves a call site- may patch in the destination of the call into the 319 // compiled code. 320 static methodHandle resolve_helper(JavaThread *thread, 321 bool is_virtual, 322 bool is_optimized, TRAPS); 323 324 private: 325 // deopt blob 326 static void generate_deopt_blob(void); 327 328 public: 329 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 330 331 // Resets a call-site in compiled code so it will get resolved again. 332 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 333 334 // In the code prolog, if the klass comparison fails, the inline cache 335 // misses and the call site is patched to megamorphic 336 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 337 338 // Find the method that called us. 339 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 340 341 342 private: 343 static Handle find_callee_info(JavaThread* thread, 344 Bytecodes::Code& bc, 345 CallInfo& callinfo, TRAPS); 346 static Handle find_callee_info_helper(JavaThread* thread, 347 vframeStream& vfst, 348 Bytecodes::Code& bc, 349 CallInfo& callinfo, TRAPS); 350 351 static methodHandle extract_attached_method(vframeStream& vfst); 352 353 static address clean_virtual_call_entry(); 354 static address clean_opt_virtual_call_entry(); 355 static address clean_static_call_entry(); 356 357 #if defined(X86) && defined(COMPILER1) 358 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available. 359 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result); 360 #endif // X86 && COMPILER1 361 362 public: 363 364 // Read the array of BasicTypes from a Java signature, and compute where 365 // compiled Java code would like to put the results. Values in reg_lo and 366 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 367 // registers, those above refer to 4-byte stack slots. All stack slots are 368 // based off of the window top. SharedInfo::stack0 refers to the first usable 369 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 370 // 4-bytes higher. So for sparc because the register window save area is at 371 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 372 // will be just above it. ( 373 // return value is the maximum number of VMReg stack slots the convention will use. 374 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing); 375 static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed); 376 static const uint java_return_convention_max_int; 377 static const uint java_return_convention_max_float; 378 379 static void check_member_name_argument_is_last_argument(const methodHandle& method, 380 const BasicType* sig_bt, 381 const VMRegPair* regs) NOT_DEBUG_RETURN; 382 383 // Ditto except for calling C 384 // 385 // C argument in register AND stack slot. 386 // Some architectures require that an argument must be passed in a register 387 // AND in a stack slot. These architectures provide a second VMRegPair array 388 // to be filled by the c_calling_convention method. On other architectures, 389 // NULL is being passed as the second VMRegPair array, so arguments are either 390 // passed in a register OR in a stack slot. 391 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2, 392 int total_args_passed); 393 394 static size_t trampoline_size(); 395 396 static void generate_trampoline(MacroAssembler *masm, address destination); 397 398 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 399 // blobs. Unlike adapters in the tiger and earlier releases the code in these 400 // blobs does not create a new frame and are therefore virtually invisible 401 // to the stack walking code. In general these blobs extend the callers stack 402 // as needed for the conversion of argument locations. 403 404 // When calling a c2i blob the code will always call the interpreter even if 405 // by the time we reach the blob there is compiled code available. This allows 406 // the blob to pass the incoming stack pointer (the sender sp) in a known 407 // location for the interpreter to record. This is used by the frame code 408 // to correct the sender code to match up with the stack pointer when the 409 // thread left the compiled code. In addition it allows the interpreter 410 // to remove the space the c2i adapter allocated to do its argument conversion. 411 412 // Although a c2i blob will always run interpreted even if compiled code is 413 // present if we see that compiled code is present the compiled call site 414 // will be patched/re-resolved so that later calls will run compiled. 415 416 // Additionally a c2i blob need to have a unverified entry because it can be reached 417 // in situations where the call site is an inlined cache site and may go megamorphic. 418 419 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 420 // that the interpreter before it does any call dispatch will record the current 421 // stack pointer in the interpreter frame. On return it will restore the stack 422 // pointer as needed. This means the i2c adapter code doesn't need any special 423 // handshaking path with compiled code to keep the stack walking correct. 424 425 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm, 426 int comp_args_on_stack, 427 const GrowableArray<SigEntry>& sig_extended, 428 const VMRegPair *regs, 429 AdapterFingerPrint* fingerprint, 430 AdapterBlob*& new_adapter); 431 432 static void gen_i2c_adapter(MacroAssembler *_masm, 433 int comp_args_on_stack, 434 const GrowableArray<SigEntry>& sig_extended, 435 const VMRegPair *regs); 436 437 // OSR support 438 439 // OSR_migration_begin will extract the jvm state from an interpreter 440 // frame (locals, monitors) and store the data in a piece of C heap 441 // storage. This then allows the interpreter frame to be removed from the 442 // stack and the OSR nmethod to be called. That method is called with a 443 // pointer to the C heap storage. This pointer is the return value from 444 // OSR_migration_begin. 445 446 static intptr_t* OSR_migration_begin(JavaThread *thread); 447 448 // OSR_migration_end is a trivial routine. It is called after the compiled 449 // method has extracted the jvm state from the C heap that OSR_migration_begin 450 // created. It's entire job is to simply free this storage. 451 static void OSR_migration_end(intptr_t* buf); 452 453 // Convert a sig into a calling convention register layout 454 // and find interesting things about it. 455 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 456 static VMReg name_for_receiver(); 457 458 // "Top of Stack" slots that may be unused by the calling convention but must 459 // otherwise be preserved. 460 // On Intel these are not necessary and the value can be zero. 461 // On Sparc this describes the words reserved for storing a register window 462 // when an interrupt occurs. 463 static uint out_preserve_stack_slots(); 464 465 // Is vector's size (in bytes) bigger than a size saved by default? 466 // For example, on x86 16 bytes XMM registers are saved by default. 467 static bool is_wide_vector(int size); 468 469 // Save and restore a native result 470 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 471 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 472 473 // Generate a native wrapper for a given method. The method takes arguments 474 // in the Java compiled code convention, marshals them to the native 475 // convention (handlizes oops, etc), transitions to native, makes the call, 476 // returns to java state (possibly blocking), unhandlizes any result and 477 // returns. 478 // 479 // The wrapper may contain special-case code if the given method 480 // is a JNI critical method, or a compiled method handle adapter, 481 // such as _invokeBasic, _linkToVirtual, etc. 482 static nmethod* generate_native_wrapper(MacroAssembler* masm, 483 const methodHandle& method, 484 int compile_id, 485 BasicType* sig_bt, 486 VMRegPair* regs, 487 BasicType ret_type); 488 489 // Block before entering a JNI critical method 490 static void block_for_jni_critical(JavaThread* thread); 491 492 // Pin/Unpin object 493 static oopDesc* pin_object(JavaThread* thread, oopDesc* obj); 494 static void unpin_object(JavaThread* thread, oopDesc* obj); 495 496 // A compiled caller has just called the interpreter, but compiled code 497 // exists. Patch the caller so he no longer calls into the interpreter. 498 static void fixup_callers_callsite(Method* moop, address ret_pc); 499 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 500 501 // Slow-path Locking and Unlocking 502 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 503 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 504 505 // Resolving of calls 506 static address resolve_static_call_C (JavaThread *thread); 507 static address resolve_virtual_call_C (JavaThread *thread); 508 static address resolve_opt_virtual_call_C(JavaThread *thread); 509 510 static void load_value_type_fields_in_regs(JavaThread *thread, oopDesc* res); 511 static void store_value_type_fields_to_buf(JavaThread *thread, intptr_t res); 512 513 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 514 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 515 oopDesc* dest, jint dest_pos, 516 jint length, JavaThread* thread); 517 518 // handle ic miss with caller being compiled code 519 // wrong method handling (inline cache misses, zombie methods) 520 static address handle_wrong_method(JavaThread* thread); 521 static address handle_wrong_method_abstract(JavaThread* thread); 522 static address handle_wrong_method_ic_miss(JavaThread* thread); 523 static void allocate_value_types(JavaThread* thread, Method* callee); 524 static void apply_post_barriers(JavaThread* thread, objArrayOopDesc* array); 525 526 static address handle_unsafe_access(JavaThread* thread, address next_pc); 527 528 static BufferedValueTypeBlob* generate_buffered_value_type_adapter(const ValueKlass* vk); 529 #ifndef PRODUCT 530 531 // Collect and print inline cache miss statistics 532 private: 533 enum { maxICmiss_count = 100 }; 534 static int _ICmiss_index; // length of IC miss histogram 535 static int _ICmiss_count[maxICmiss_count]; // miss counts 536 static address _ICmiss_at[maxICmiss_count]; // miss addresses 537 static void trace_ic_miss(address at); 538 539 public: 540 static int _throw_null_ctr; // throwing a null-pointer exception 541 static int _ic_miss_ctr; // total # of IC misses 542 static int _wrong_method_ctr; 543 static int _resolve_static_ctr; 544 static int _resolve_virtual_ctr; 545 static int _resolve_opt_virtual_ctr; 546 static int _implicit_null_throws; 547 static int _implicit_div0_throws; 548 549 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 550 static int _jshort_array_copy_ctr; // Slow-path short array copy 551 static int _jint_array_copy_ctr; // Slow-path int array copy 552 static int _jlong_array_copy_ctr; // Slow-path long array copy 553 static int _oop_array_copy_ctr; // Slow-path oop array copy 554 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 555 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 556 static int _generic_array_copy_ctr; // Slow-path includes type decoding 557 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 558 559 static int _new_instance_ctr; // 'new' object requires GC 560 static int _new_array_ctr; // 'new' array requires GC 561 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 562 static int _find_handler_ctr; // find exception handler 563 static int _rethrow_ctr; // rethrow exception 564 static int _mon_enter_stub_ctr; // monitor enter stub 565 static int _mon_exit_stub_ctr; // monitor exit stub 566 static int _mon_enter_ctr; // monitor enter slow 567 static int _mon_exit_ctr; // monitor exit slow 568 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 569 570 // Statistics code 571 // stats for "normal" compiled calls (non-interface) 572 static int _nof_normal_calls; // total # of calls 573 static int _nof_optimized_calls; // total # of statically-bound calls 574 static int _nof_inlined_calls; // total # of inlined normal calls 575 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 576 static int _nof_inlined_static_calls; // total # of inlined static calls 577 // stats for compiled interface calls 578 static int _nof_interface_calls; // total # of compiled calls 579 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 580 static int _nof_inlined_interface_calls; // total # of inlined interface calls 581 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 582 // stats for runtime exceptions 583 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 584 585 public: // for compiler 586 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 587 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 588 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 589 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 590 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 591 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 592 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 593 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 594 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 595 static void print_call_statistics(int comp_total); 596 static void print_statistics(); 597 static void print_ic_miss_histogram(); 598 599 #endif // PRODUCT 600 }; 601 602 603 // --------------------------------------------------------------------------- 604 // Implementation of AdapterHandlerLibrary 605 // 606 // This library manages argument marshaling adapters and native wrappers. 607 // There are 2 flavors of adapters: I2C and C2I. 608 // 609 // The I2C flavor takes a stock interpreted call setup, marshals the 610 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 611 // code_begin(). It is broken to call it without an nmethod assigned. 612 // The usual behavior is to lift any register arguments up out of the 613 // stack and possibly re-pack the extra arguments to be contiguous. 614 // I2C adapters will save what the interpreter's stack pointer will be 615 // after arguments are popped, then adjust the interpreter's frame 616 // size to force alignment and possibly to repack the arguments. 617 // After re-packing, it jumps to the compiled code start. There are 618 // no safepoints in this adapter code and a GC cannot happen while 619 // marshaling is in progress. 620 // 621 // The C2I flavor takes a stock compiled call setup plus the target method in 622 // Rmethod, marshals the arguments for an interpreted call and jumps to 623 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 624 // setup. Compiled frames are fixed-size and the args are likely not in the 625 // right place. Hence all the args will likely be copied into the 626 // interpreter's frame, forcing that frame to grow. The compiled frame's 627 // outgoing stack args will be dead after the copy. 628 // 629 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 630 // also perform an official frame push & pop. They have a call to the native 631 // routine in their middles and end in a return (instead of ending in a jump). 632 // The native wrappers are stored in real nmethods instead of the BufferBlobs 633 // used by the adapters. The code generation happens here because it's very 634 // similar to what the adapters have to do. 635 636 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 637 friend class AdapterHandlerTable; 638 639 private: 640 AdapterFingerPrint* _fingerprint; 641 address _i2c_entry; 642 address _c2i_entry; 643 address _c2i_unverified_entry; 644 Symbol* _sig_extended; 645 646 #ifdef ASSERT 647 // Captures code and signature used to generate this adapter when 648 // verifying adapter equivalence. 649 unsigned char* _saved_code; 650 int _saved_code_length; 651 #endif 652 653 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, Symbol* sig_extended) { 654 _fingerprint = fingerprint; 655 _i2c_entry = i2c_entry; 656 _c2i_entry = c2i_entry; 657 _c2i_unverified_entry = c2i_unverified_entry; 658 _sig_extended = sig_extended; 659 #ifdef ASSERT 660 _saved_code = NULL; 661 _saved_code_length = 0; 662 #endif 663 } 664 665 void deallocate(); 666 667 // should never be used 668 AdapterHandlerEntry(); 669 670 public: 671 address get_i2c_entry() const { return _i2c_entry; } 672 address get_c2i_entry() const { return _c2i_entry; } 673 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 674 Symbol* get_sig_extended() const { return _sig_extended; } 675 address base_address(); 676 void relocate(address new_base); 677 678 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 679 680 AdapterHandlerEntry* next() { 681 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 682 } 683 684 #ifdef ASSERT 685 // Used to verify that code generated for shared adapters is equivalent 686 void save_code (unsigned char* code, int length); 687 bool compare_code(unsigned char* code, int length); 688 #endif 689 690 //virtual void print_on(outputStream* st) const; DO NOT USE 691 void print_adapter_on(outputStream* st) const; 692 }; 693 694 // This class is used only with DumpSharedSpaces==true. It holds extra information 695 // that's used only during CDS dump time. 696 // For details, see comments around Method::link_method() 697 class CDSAdapterHandlerEntry: public AdapterHandlerEntry { 698 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region 699 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region 700 701 public: 702 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; } 703 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; } 704 void init() NOT_CDS_RETURN; 705 }; 706 707 708 class AdapterHandlerLibrary: public AllStatic { 709 private: 710 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 711 static AdapterHandlerTable* _adapters; 712 static AdapterHandlerEntry* _abstract_method_handler; 713 static BufferBlob* buffer_blob(); 714 static void initialize(); 715 static AdapterHandlerEntry* get_adapter0(const methodHandle& method, TRAPS); 716 717 public: 718 719 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 720 address i2c_entry, address c2i_entry, address c2i_unverified_entry, 721 Symbol* sig_extended = NULL); 722 static void create_native_wrapper(const methodHandle& method); 723 static AdapterHandlerEntry* get_adapter(const methodHandle& method, TRAPS); 724 725 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 726 static void print_handler_on(outputStream* st, const CodeBlob* b); 727 static bool contains(const CodeBlob* b); 728 #ifndef PRODUCT 729 static void print_statistics(); 730 #endif // PRODUCT 731 732 }; 733 734 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP