1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 27 28 #include "interpreter/bytecodeHistogram.hpp" 29 #include "interpreter/bytecodeTracer.hpp" 30 #include "interpreter/linkResolver.hpp" 31 #include "memory/allocation.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "utilities/hashtable.hpp" 34 #include "utilities/macros.hpp" 35 36 class AdapterHandlerEntry; 37 class AdapterHandlerTable; 38 class AdapterFingerPrint; 39 class vframeStream; 40 41 // 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 int _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 static RuntimeStub* generate_return_value_blob(address destination, const char* name); 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 #if INCLUDE_ALL_GCS 186 // G1 write barriers 187 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 188 static void g1_wb_post(void* card_addr, JavaThread* thread); 189 #endif // INCLUDE_ALL_GCS 190 191 // exception handling and implicit exceptions 192 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception, 193 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred); 194 enum ImplicitExceptionKind { 195 IMPLICIT_NULL, 196 IMPLICIT_DIVIDE_BY_ZERO, 197 STACK_OVERFLOW 198 }; 199 static void throw_AbstractMethodError(JavaThread* thread); 200 static void throw_IncompatibleClassChangeError(JavaThread* thread); 201 static void throw_ArithmeticException(JavaThread* thread); 202 static void throw_NullPointerException(JavaThread* thread); 203 static void throw_NullPointerException_at_call(JavaThread* thread); 204 static void throw_StackOverflowError(JavaThread* thread); 205 static void throw_delayed_StackOverflowError(JavaThread* thread); 206 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed); 207 static address continuation_for_implicit_exception(JavaThread* thread, 208 address faulting_pc, 209 ImplicitExceptionKind exception_kind); 210 #if INCLUDE_JVMCI 211 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason); 212 #endif 213 214 static void enable_stack_reserved_zone(JavaThread* thread); 215 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr); 216 217 // Shared stub locations 218 static address get_poll_stub(address pc); 219 220 static address get_ic_miss_stub() { 221 assert(_ic_miss_blob!= NULL, "oops"); 222 return _ic_miss_blob->entry_point(); 223 } 224 225 static address get_handle_wrong_method_stub() { 226 assert(_wrong_method_blob!= NULL, "oops"); 227 return _wrong_method_blob->entry_point(); 228 } 229 230 static address get_handle_wrong_method_abstract_stub() { 231 assert(_wrong_method_abstract_blob!= NULL, "oops"); 232 return _wrong_method_abstract_blob->entry_point(); 233 } 234 235 #ifdef COMPILER2 236 static void generate_uncommon_trap_blob(void); 237 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 238 #endif // COMPILER2 239 240 static address get_resolve_opt_virtual_call_stub() { 241 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 242 return _resolve_opt_virtual_call_blob->entry_point(); 243 } 244 static address get_resolve_virtual_call_stub() { 245 assert(_resolve_virtual_call_blob != NULL, "oops"); 246 return _resolve_virtual_call_blob->entry_point(); 247 } 248 static address get_resolve_static_call_stub() { 249 assert(_resolve_static_call_blob != NULL, "oops"); 250 return _resolve_static_call_blob->entry_point(); 251 } 252 253 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 254 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 255 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 256 257 // Counters 258 #ifndef PRODUCT 259 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 260 #endif // PRODUCT 261 262 // Helper routine for full-speed JVMTI exception throwing support 263 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 264 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 265 266 // RedefineClasses() tracing support for obsolete method entry 267 static int rc_trace_method_entry(JavaThread* thread, Method* m); 268 269 // To be used as the entry point for unresolved native methods. 270 static address native_method_throw_unsatisfied_link_error_entry(); 271 static address native_method_throw_unsupported_operation_exception_entry(); 272 273 static oop retrieve_receiver(Symbol* sig, frame caller); 274 275 static void register_finalizer(JavaThread* thread, oopDesc* obj); 276 277 // dtrace notifications 278 static int dtrace_object_alloc(oopDesc* o, int size); 279 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size); 280 static int dtrace_method_entry(JavaThread* thread, Method* m); 281 static int dtrace_method_exit(JavaThread* thread, Method* m); 282 283 // Utility method for retrieving the Java thread id, returns 0 if the 284 // thread is not a well formed Java thread. 285 static jlong get_java_tid(Thread* thread); 286 287 288 // used by native wrappers to reenable yellow if overflow happened in native code 289 static void reguard_yellow_pages(); 290 291 // Fill in the "X cannot be cast to a Y" message for ClassCastException 292 // 293 // @param thr the current thread 294 // @param caster_klass the class of the object we are casting 295 // @return the dynamically allocated exception message (must be freed 296 // by the caller using a resource mark) 297 // 298 // BCP must refer to the current 'checkcast' opcode for the frame 299 // on top of the stack. 300 // The caller (or one of its callers) must use a ResourceMark 301 // in order to correctly free the result. 302 // 303 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass); 304 305 // Fill in the "X cannot be cast to a Y" message for ClassCastException 306 // 307 // @param caster_klass the class of the object we are casting 308 // @param target_klass the target klass attempt 309 // @return the dynamically allocated exception message (must be freed 310 // by the caller using a resource mark) 311 // 312 // This version does not require access the frame, so it can be called 313 // from interpreted code 314 // The caller (or one of it's callers) must use a ResourceMark 315 // in order to correctly free the result. 316 // 317 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass); 318 319 // Resolves a call site- may patch in the destination of the call into the 320 // compiled code. 321 static methodHandle resolve_helper(JavaThread *thread, 322 bool is_virtual, 323 bool is_optimized, TRAPS); 324 325 private: 326 // deopt blob 327 static void generate_deopt_blob(void); 328 329 public: 330 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 331 332 // Resets a call-site in compiled code so it will get resolved again. 333 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 334 335 // In the code prolog, if the klass comparison fails, the inline cache 336 // misses and the call site is patched to megamorphic 337 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 338 339 // Find the method that called us. 340 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 341 342 343 private: 344 static Handle find_callee_info(JavaThread* thread, 345 Bytecodes::Code& bc, 346 CallInfo& callinfo, TRAPS); 347 static Handle find_callee_info_helper(JavaThread* thread, 348 vframeStream& vfst, 349 Bytecodes::Code& bc, 350 CallInfo& callinfo, TRAPS); 351 352 static methodHandle extract_attached_method(vframeStream& vfst); 353 354 static address clean_virtual_call_entry(); 355 static address clean_opt_virtual_call_entry(); 356 static address clean_static_call_entry(); 357 358 #if defined(X86) && defined(COMPILER1) 359 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available. 360 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, methodHandle method, Register obj_reg, Register result); 361 #endif // X86 && COMPILER1 362 363 public: 364 365 // Read the array of BasicTypes from a Java signature, and compute where 366 // compiled Java code would like to put the results. Values in reg_lo and 367 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 368 // registers, those above refer to 4-byte stack slots. All stack slots are 369 // based off of the window top. SharedInfo::stack0 refers to the first usable 370 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 371 // 4-bytes higher. So for sparc because the register window save area is at 372 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 373 // will be just above it. ( 374 // return value is the maximum number of VMReg stack slots the convention will use. 375 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing); 376 static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed); 377 static const uint java_return_convention_max_int; 378 static const uint java_return_convention_max_float; 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 comp_args_on_stack, 428 const GrowableArray<SigEntry>& sig_extended, 429 const VMRegPair *regs, 430 AdapterFingerPrint* fingerprint, 431 AdapterBlob*& new_adapter); 432 433 static void gen_i2c_adapter(MacroAssembler *_masm, 434 int comp_args_on_stack, 435 const GrowableArray<SigEntry>& sig_extended, 436 const VMRegPair *regs); 437 438 // OSR support 439 440 // OSR_migration_begin will extract the jvm state from an interpreter 441 // frame (locals, monitors) and store the data in a piece of C heap 442 // storage. This then allows the interpreter frame to be removed from the 443 // stack and the OSR nmethod to be called. That method is called with a 444 // pointer to the C heap storage. This pointer is the return value from 445 // OSR_migration_begin. 446 447 static intptr_t* OSR_migration_begin(JavaThread *thread); 448 449 // OSR_migration_end is a trivial routine. It is called after the compiled 450 // method has extracted the jvm state from the C heap that OSR_migration_begin 451 // created. It's entire job is to simply free this storage. 452 static void OSR_migration_end(intptr_t* buf); 453 454 // Convert a sig into a calling convention register layout 455 // and find interesting things about it. 456 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 457 static VMReg name_for_receiver(); 458 459 // "Top of Stack" slots that may be unused by the calling convention but must 460 // otherwise be preserved. 461 // On Intel these are not necessary and the value can be zero. 462 // On Sparc this describes the words reserved for storing a register window 463 // when an interrupt occurs. 464 static uint out_preserve_stack_slots(); 465 466 // Is vector's size (in bytes) bigger than a size saved by default? 467 // For example, on x86 16 bytes XMM registers are saved by default. 468 static bool is_wide_vector(int size); 469 470 // Save and restore a native result 471 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 472 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 473 474 // Generate a native wrapper for a given method. The method takes arguments 475 // in the Java compiled code convention, marshals them to the native 476 // convention (handlizes oops, etc), transitions to native, makes the call, 477 // returns to java state (possibly blocking), unhandlizes any result and 478 // returns. 479 // 480 // The wrapper may contain special-case code if the given method 481 // is a JNI critical method, or a compiled method handle adapter, 482 // such as _invokeBasic, _linkToVirtual, etc. 483 static nmethod* generate_native_wrapper(MacroAssembler* masm, 484 const methodHandle& method, 485 int compile_id, 486 BasicType* sig_bt, 487 VMRegPair* regs, 488 BasicType ret_type); 489 490 // Block before entering a JNI critical method 491 static void block_for_jni_critical(JavaThread* thread); 492 493 // A compiled caller has just called the interpreter, but compiled code 494 // exists. Patch the caller so he no longer calls into the interpreter. 495 static void fixup_callers_callsite(Method* moop, address ret_pc); 496 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 497 498 // Slow-path Locking and Unlocking 499 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 500 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 501 502 // Resolving of calls 503 static address resolve_static_call_C (JavaThread *thread); 504 static address resolve_virtual_call_C (JavaThread *thread); 505 static address resolve_opt_virtual_call_C(JavaThread *thread); 506 507 static void load_value_type_fields_in_regs(JavaThread *thread, oopDesc* res); 508 static void store_value_type_fields_to_buf(JavaThread *thread, intptr_t res); 509 510 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 511 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 512 oopDesc* dest, jint dest_pos, 513 jint length, JavaThread* thread); 514 515 // handle ic miss with caller being compiled code 516 // wrong method handling (inline cache misses, zombie methods) 517 static address handle_wrong_method(JavaThread* thread); 518 static address handle_wrong_method_abstract(JavaThread* thread); 519 static address handle_wrong_method_ic_miss(JavaThread* thread); 520 static void allocate_value_types(JavaThread* thread, Method* callee); 521 static void apply_post_barriers(JavaThread* thread, objArrayOopDesc* array); 522 523 static address handle_unsafe_access(JavaThread* thread, address next_pc); 524 525 #ifndef PRODUCT 526 527 // Collect and print inline cache miss statistics 528 private: 529 enum { maxICmiss_count = 100 }; 530 static int _ICmiss_index; // length of IC miss histogram 531 static int _ICmiss_count[maxICmiss_count]; // miss counts 532 static address _ICmiss_at[maxICmiss_count]; // miss addresses 533 static void trace_ic_miss(address at); 534 535 public: 536 static int _throw_null_ctr; // throwing a null-pointer exception 537 static int _ic_miss_ctr; // total # of IC misses 538 static int _wrong_method_ctr; 539 static int _resolve_static_ctr; 540 static int _resolve_virtual_ctr; 541 static int _resolve_opt_virtual_ctr; 542 static int _implicit_null_throws; 543 static int _implicit_div0_throws; 544 545 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 546 static int _jshort_array_copy_ctr; // Slow-path short array copy 547 static int _jint_array_copy_ctr; // Slow-path int array copy 548 static int _jlong_array_copy_ctr; // Slow-path long array copy 549 static int _oop_array_copy_ctr; // Slow-path oop array copy 550 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 551 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 552 static int _generic_array_copy_ctr; // Slow-path includes type decoding 553 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 554 555 static int _new_instance_ctr; // 'new' object requires GC 556 static int _new_array_ctr; // 'new' array requires GC 557 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 558 static int _find_handler_ctr; // find exception handler 559 static int _rethrow_ctr; // rethrow exception 560 static int _mon_enter_stub_ctr; // monitor enter stub 561 static int _mon_exit_stub_ctr; // monitor exit stub 562 static int _mon_enter_ctr; // monitor enter slow 563 static int _mon_exit_ctr; // monitor exit slow 564 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 565 566 // Statistics code 567 // stats for "normal" compiled calls (non-interface) 568 static int _nof_normal_calls; // total # of calls 569 static int _nof_optimized_calls; // total # of statically-bound calls 570 static int _nof_inlined_calls; // total # of inlined normal calls 571 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 572 static int _nof_inlined_static_calls; // total # of inlined static calls 573 // stats for compiled interface calls 574 static int _nof_interface_calls; // total # of compiled calls 575 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 576 static int _nof_inlined_interface_calls; // total # of inlined interface calls 577 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 578 // stats for runtime exceptions 579 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 580 581 public: // for compiler 582 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 583 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 584 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 585 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 586 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 587 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 588 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 589 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 590 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 591 static void print_call_statistics(int comp_total); 592 static void print_statistics(); 593 static void print_ic_miss_histogram(); 594 595 #endif // PRODUCT 596 }; 597 598 599 // --------------------------------------------------------------------------- 600 // Implementation of AdapterHandlerLibrary 601 // 602 // This library manages argument marshaling adapters and native wrappers. 603 // There are 2 flavors of adapters: I2C and C2I. 604 // 605 // The I2C flavor takes a stock interpreted call setup, marshals the 606 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 607 // code_begin(). It is broken to call it without an nmethod assigned. 608 // The usual behavior is to lift any register arguments up out of the 609 // stack and possibly re-pack the extra arguments to be contiguous. 610 // I2C adapters will save what the interpreter's stack pointer will be 611 // after arguments are popped, then adjust the interpreter's frame 612 // size to force alignment and possibly to repack the arguments. 613 // After re-packing, it jumps to the compiled code start. There are 614 // no safepoints in this adapter code and a GC cannot happen while 615 // marshaling is in progress. 616 // 617 // The C2I flavor takes a stock compiled call setup plus the target method in 618 // Rmethod, marshals the arguments for an interpreted call and jumps to 619 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 620 // setup. Compiled frames are fixed-size and the args are likely not in the 621 // right place. Hence all the args will likely be copied into the 622 // interpreter's frame, forcing that frame to grow. The compiled frame's 623 // outgoing stack args will be dead after the copy. 624 // 625 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 626 // also perform an official frame push & pop. They have a call to the native 627 // routine in their middles and end in a return (instead of ending in a jump). 628 // The native wrappers are stored in real nmethods instead of the BufferBlobs 629 // used by the adapters. The code generation happens here because it's very 630 // similar to what the adapters have to do. 631 632 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 633 friend class AdapterHandlerTable; 634 635 private: 636 AdapterFingerPrint* _fingerprint; 637 address _i2c_entry; 638 address _c2i_entry; 639 address _c2i_unverified_entry; 640 Symbol* _sig_extended; 641 642 #ifdef ASSERT 643 // Captures code and signature used to generate this adapter when 644 // verifying adapter equivalence. 645 unsigned char* _saved_code; 646 int _saved_code_length; 647 #endif 648 649 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, Symbol* sig_extended) { 650 _fingerprint = fingerprint; 651 _i2c_entry = i2c_entry; 652 _c2i_entry = c2i_entry; 653 _c2i_unverified_entry = c2i_unverified_entry; 654 _sig_extended = sig_extended; 655 #ifdef ASSERT 656 _saved_code = NULL; 657 _saved_code_length = 0; 658 #endif 659 } 660 661 void deallocate(); 662 663 // should never be used 664 AdapterHandlerEntry(); 665 666 public: 667 address get_i2c_entry() const { return _i2c_entry; } 668 address get_c2i_entry() const { return _c2i_entry; } 669 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 670 Symbol* get_sig_extended() const { return _sig_extended; } 671 address base_address(); 672 void relocate(address new_base); 673 674 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 675 676 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: 698 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; } 699 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 Symbol* sig_extended = NULL); 718 static void create_native_wrapper(const methodHandle& method); 719 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 720 721 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 722 static void print_handler_on(outputStream* st, const CodeBlob* b); 723 static bool contains(const CodeBlob* b); 724 #ifndef PRODUCT 725 static void print_statistics(); 726 #endif // PRODUCT 727 728 }; 729 730 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP