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 64 static DeoptimizationBlob* _deopt_blob; 65 66 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob; 67 static SafepointBlob* _polling_page_safepoint_handler_blob; 68 static SafepointBlob* _polling_page_return_handler_blob; 69 70 #ifdef COMPILER2 71 static UncommonTrapBlob* _uncommon_trap_blob; 72 #endif // COMPILER2 73 74 #ifndef PRODUCT 75 // Counters 76 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 77 #endif // !PRODUCT 78 79 private: 80 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP }; 81 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type); 82 static RuntimeStub* generate_resolve_blob(address destination, const char* name); 83 84 public: 85 static void generate_stubs(void); 86 87 // max bytes for each dtrace string parameter 88 enum { max_dtrace_string_size = 256 }; 89 90 // The following arithmetic routines are used on platforms that do 91 // not have machine instructions to implement their functionality. 92 // Do not remove these. 93 94 // long arithmetics 95 static jlong lmul(jlong y, jlong x); 96 static jlong ldiv(jlong y, jlong x); 97 static jlong lrem(jlong y, jlong x); 98 99 // float and double remainder 100 static jfloat frem(jfloat x, jfloat y); 101 static jdouble drem(jdouble x, jdouble y); 102 103 104 #ifdef _WIN64 105 // Workaround for fmod issue in the Windows x64 CRT 106 static double fmod_winx64(double x, double y); 107 #endif 108 109 #ifdef __SOFTFP__ 110 static jfloat fadd(jfloat x, jfloat y); 111 static jfloat fsub(jfloat x, jfloat y); 112 static jfloat fmul(jfloat x, jfloat y); 113 static jfloat fdiv(jfloat x, jfloat y); 114 115 static jdouble dadd(jdouble x, jdouble y); 116 static jdouble dsub(jdouble x, jdouble y); 117 static jdouble dmul(jdouble x, jdouble y); 118 static jdouble ddiv(jdouble x, jdouble y); 119 #endif // __SOFTFP__ 120 121 // float conversion (needs to set appropriate rounding mode) 122 static jint f2i (jfloat x); 123 static jlong f2l (jfloat x); 124 static jint d2i (jdouble x); 125 static jlong d2l (jdouble x); 126 static jfloat d2f (jdouble x); 127 static jfloat l2f (jlong x); 128 static jdouble l2d (jlong x); 129 130 #ifdef __SOFTFP__ 131 static jfloat i2f (jint x); 132 static jdouble i2d (jint x); 133 static jdouble f2d (jfloat x); 134 #endif // __SOFTFP__ 135 136 // double trigonometrics and transcendentals 137 static jdouble dsin(jdouble x); 138 static jdouble dcos(jdouble x); 139 static jdouble dtan(jdouble x); 140 static jdouble dlog(jdouble x); 141 static jdouble dlog10(jdouble x); 142 static jdouble dexp(jdouble x); 143 static jdouble dpow(jdouble x, jdouble y); 144 145 #if defined(__SOFTFP__) || defined(E500V2) 146 static double dabs(double f); 147 #endif 148 149 #if defined(__SOFTFP__) || defined(PPC) 150 static double dsqrt(double f); 151 #endif 152 153 // Montgomery multiplication 154 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 155 jint len, jlong inv, jint *m_ints); 156 static void montgomery_square(jint *a_ints, jint *n_ints, 157 jint len, jlong inv, jint *m_ints); 158 159 #ifdef __SOFTFP__ 160 // C++ compiler generates soft float instructions as well as passing 161 // float and double in registers. 162 static int fcmpl(float x, float y); 163 static int fcmpg(float x, float y); 164 static int dcmpl(double x, double y); 165 static int dcmpg(double x, double y); 166 167 static int unordered_fcmplt(float x, float y); 168 static int unordered_dcmplt(double x, double y); 169 static int unordered_fcmple(float x, float y); 170 static int unordered_dcmple(double x, double y); 171 static int unordered_fcmpge(float x, float y); 172 static int unordered_dcmpge(double x, double y); 173 static int unordered_fcmpgt(float x, float y); 174 static int unordered_dcmpgt(double x, double y); 175 176 static float fneg(float f); 177 static double dneg(double f); 178 #endif 179 180 // exception handling across interpreter/compiler boundaries 181 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 182 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 183 184 #if INCLUDE_ALL_GCS 185 // G1 write barriers 186 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 187 static void g1_wb_post(void* card_addr, JavaThread* thread); 188 #endif // INCLUDE_ALL_GCS 189 190 // exception handling and implicit exceptions 191 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception, 192 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred); 193 enum ImplicitExceptionKind { 194 IMPLICIT_NULL, 195 IMPLICIT_DIVIDE_BY_ZERO, 196 STACK_OVERFLOW 197 }; 198 static void throw_AbstractMethodError(JavaThread* thread); 199 static void throw_IncompatibleClassChangeError(JavaThread* thread); 200 static void throw_ArithmeticException(JavaThread* thread); 201 static void throw_NullPointerException(JavaThread* thread); 202 static void throw_NullPointerException_at_call(JavaThread* thread); 203 static void throw_StackOverflowError(JavaThread* thread); 204 static void throw_delayed_StackOverflowError(JavaThread* thread); 205 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed); 206 static address continuation_for_implicit_exception(JavaThread* thread, 207 address faulting_pc, 208 ImplicitExceptionKind exception_kind); 209 #if INCLUDE_JVMCI 210 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason); 211 #endif 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); 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, 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); 375 376 static void check_member_name_argument_is_last_argument(const methodHandle& method, 377 const BasicType* sig_bt, 378 const VMRegPair* regs) NOT_DEBUG_RETURN; 379 380 // Ditto except for calling C 381 // 382 // C argument in register AND stack slot. 383 // Some architectures require that an argument must be passed in a register 384 // AND in a stack slot. These architectures provide a second VMRegPair array 385 // to be filled by the c_calling_convention method. On other architectures, 386 // NULL is being passed as the second VMRegPair array, so arguments are either 387 // passed in a register OR in a stack slot. 388 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2, 389 int total_args_passed); 390 391 static size_t trampoline_size(); 392 393 static void generate_trampoline(MacroAssembler *masm, address destination); 394 395 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 396 // blobs. Unlike adapters in the tiger and earlier releases the code in these 397 // blobs does not create a new frame and are therefore virtually invisible 398 // to the stack walking code. In general these blobs extend the callers stack 399 // as needed for the conversion of argument locations. 400 401 // When calling a c2i blob the code will always call the interpreter even if 402 // by the time we reach the blob there is compiled code available. This allows 403 // the blob to pass the incoming stack pointer (the sender sp) in a known 404 // location for the interpreter to record. This is used by the frame code 405 // to correct the sender code to match up with the stack pointer when the 406 // thread left the compiled code. In addition it allows the interpreter 407 // to remove the space the c2i adapter allocated to do its argument conversion. 408 409 // Although a c2i blob will always run interpreted even if compiled code is 410 // present if we see that compiled code is present the compiled call site 411 // will be patched/re-resolved so that later calls will run compiled. 412 413 // Additionally a c2i blob need to have a unverified entry because it can be reached 414 // in situations where the call site is an inlined cache site and may go megamorphic. 415 416 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 417 // that the interpreter before it does any call dispatch will record the current 418 // stack pointer in the interpreter frame. On return it will restore the stack 419 // pointer as needed. This means the i2c adapter code doesn't need any special 420 // handshaking path with compiled code to keep the stack walking correct. 421 422 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 423 int total_args_passed, 424 int max_arg, 425 const BasicType *sig_bt, 426 const VMRegPair *regs, 427 AdapterFingerPrint* fingerprint); 428 429 static void gen_i2c_adapter(MacroAssembler *_masm, 430 int total_args_passed, 431 int comp_args_on_stack, 432 const BasicType *sig_bt, 433 const VMRegPair *regs); 434 435 // OSR support 436 437 // OSR_migration_begin will extract the jvm state from an interpreter 438 // frame (locals, monitors) and store the data in a piece of C heap 439 // storage. This then allows the interpreter frame to be removed from the 440 // stack and the OSR nmethod to be called. That method is called with a 441 // pointer to the C heap storage. This pointer is the return value from 442 // OSR_migration_begin. 443 444 static intptr_t* OSR_migration_begin(JavaThread *thread); 445 446 // OSR_migration_end is a trivial routine. It is called after the compiled 447 // method has extracted the jvm state from the C heap that OSR_migration_begin 448 // created. It's entire job is to simply free this storage. 449 static void OSR_migration_end(intptr_t* buf); 450 451 // Convert a sig into a calling convention register layout 452 // and find interesting things about it. 453 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 454 static VMReg name_for_receiver(); 455 456 // "Top of Stack" slots that may be unused by the calling convention but must 457 // otherwise be preserved. 458 // On Intel these are not necessary and the value can be zero. 459 // On Sparc this describes the words reserved for storing a register window 460 // when an interrupt occurs. 461 static uint out_preserve_stack_slots(); 462 463 // Is vector's size (in bytes) bigger than a size saved by default? 464 // For example, on x86 16 bytes XMM registers are saved by default. 465 static bool is_wide_vector(int size); 466 467 // Save and restore a native result 468 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 469 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 470 471 // Generate a native wrapper for a given method. The method takes arguments 472 // in the Java compiled code convention, marshals them to the native 473 // convention (handlizes oops, etc), transitions to native, makes the call, 474 // returns to java state (possibly blocking), unhandlizes any result and 475 // returns. 476 // 477 // The wrapper may contain special-case code if the given method 478 // is a JNI critical method, or a compiled method handle adapter, 479 // such as _invokeBasic, _linkToVirtual, etc. 480 static nmethod* generate_native_wrapper(MacroAssembler* masm, 481 const methodHandle& method, 482 int compile_id, 483 BasicType* sig_bt, 484 VMRegPair* regs, 485 BasicType ret_type); 486 487 // Block before entering a JNI critical method 488 static void block_for_jni_critical(JavaThread* thread); 489 490 // A compiled caller has just called the interpreter, but compiled code 491 // exists. Patch the caller so he no longer calls into the interpreter. 492 static void fixup_callers_callsite(Method* moop, address ret_pc); 493 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 494 495 // Slow-path Locking and Unlocking 496 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 497 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 498 499 // Resolving of calls 500 static address resolve_static_call_C (JavaThread *thread); 501 static address resolve_virtual_call_C (JavaThread *thread); 502 static address resolve_opt_virtual_call_C(JavaThread *thread); 503 504 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 505 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 506 oopDesc* dest, jint dest_pos, 507 jint length, JavaThread* thread); 508 509 // handle ic miss with caller being compiled code 510 // wrong method handling (inline cache misses, zombie methods) 511 static address handle_wrong_method(JavaThread* thread); 512 static address handle_wrong_method_abstract(JavaThread* thread); 513 static address handle_wrong_method_ic_miss(JavaThread* thread); 514 515 static address handle_unsafe_access(JavaThread* thread, address next_pc); 516 517 #ifndef PRODUCT 518 519 // Collect and print inline cache miss statistics 520 private: 521 enum { maxICmiss_count = 100 }; 522 static int _ICmiss_index; // length of IC miss histogram 523 static int _ICmiss_count[maxICmiss_count]; // miss counts 524 static address _ICmiss_at[maxICmiss_count]; // miss addresses 525 static void trace_ic_miss(address at); 526 527 public: 528 static int _throw_null_ctr; // throwing a null-pointer exception 529 static int _ic_miss_ctr; // total # of IC misses 530 static int _wrong_method_ctr; 531 static int _resolve_static_ctr; 532 static int _resolve_virtual_ctr; 533 static int _resolve_opt_virtual_ctr; 534 static int _implicit_null_throws; 535 static int _implicit_div0_throws; 536 537 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 538 static int _jshort_array_copy_ctr; // Slow-path short array copy 539 static int _jint_array_copy_ctr; // Slow-path int array copy 540 static int _jlong_array_copy_ctr; // Slow-path long array copy 541 static int _oop_array_copy_ctr; // Slow-path oop array copy 542 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 543 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 544 static int _generic_array_copy_ctr; // Slow-path includes type decoding 545 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 546 547 static int _new_instance_ctr; // 'new' object requires GC 548 static int _new_array_ctr; // 'new' array requires GC 549 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 550 static int _find_handler_ctr; // find exception handler 551 static int _rethrow_ctr; // rethrow exception 552 static int _mon_enter_stub_ctr; // monitor enter stub 553 static int _mon_exit_stub_ctr; // monitor exit stub 554 static int _mon_enter_ctr; // monitor enter slow 555 static int _mon_exit_ctr; // monitor exit slow 556 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 557 558 // Statistics code 559 // stats for "normal" compiled calls (non-interface) 560 static int _nof_normal_calls; // total # of calls 561 static int _nof_optimized_calls; // total # of statically-bound calls 562 static int _nof_inlined_calls; // total # of inlined normal calls 563 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 564 static int _nof_inlined_static_calls; // total # of inlined static calls 565 // stats for compiled interface calls 566 static int _nof_interface_calls; // total # of compiled calls 567 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 568 static int _nof_inlined_interface_calls; // total # of inlined interface calls 569 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 570 // stats for runtime exceptions 571 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 572 573 public: // for compiler 574 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 575 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 576 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 577 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 578 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 579 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 580 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 581 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 582 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 583 static void print_call_statistics(int comp_total); 584 static void print_statistics(); 585 static void print_ic_miss_histogram(); 586 587 #endif // PRODUCT 588 }; 589 590 591 // --------------------------------------------------------------------------- 592 // Implementation of AdapterHandlerLibrary 593 // 594 // This library manages argument marshaling adapters and native wrappers. 595 // There are 2 flavors of adapters: I2C and C2I. 596 // 597 // The I2C flavor takes a stock interpreted call setup, marshals the 598 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 599 // code_begin(). It is broken to call it without an nmethod assigned. 600 // The usual behavior is to lift any register arguments up out of the 601 // stack and possibly re-pack the extra arguments to be contiguous. 602 // I2C adapters will save what the interpreter's stack pointer will be 603 // after arguments are popped, then adjust the interpreter's frame 604 // size to force alignment and possibly to repack the arguments. 605 // After re-packing, it jumps to the compiled code start. There are 606 // no safepoints in this adapter code and a GC cannot happen while 607 // marshaling is in progress. 608 // 609 // The C2I flavor takes a stock compiled call setup plus the target method in 610 // Rmethod, marshals the arguments for an interpreted call and jumps to 611 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 612 // setup. Compiled frames are fixed-size and the args are likely not in the 613 // right place. Hence all the args will likely be copied into the 614 // interpreter's frame, forcing that frame to grow. The compiled frame's 615 // outgoing stack args will be dead after the copy. 616 // 617 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 618 // also perform an official frame push & pop. They have a call to the native 619 // routine in their middles and end in a return (instead of ending in a jump). 620 // The native wrappers are stored in real nmethods instead of the BufferBlobs 621 // used by the adapters. The code generation happens here because it's very 622 // similar to what the adapters have to do. 623 624 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 625 friend class AdapterHandlerTable; 626 627 private: 628 AdapterFingerPrint* _fingerprint; 629 address _i2c_entry; 630 address _c2i_entry; 631 address _c2i_unverified_entry; 632 633 #ifdef ASSERT 634 // Captures code and signature used to generate this adapter when 635 // verifying adapter equivalence. 636 unsigned char* _saved_code; 637 int _saved_code_length; 638 #endif 639 640 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 641 _fingerprint = fingerprint; 642 _i2c_entry = i2c_entry; 643 _c2i_entry = c2i_entry; 644 _c2i_unverified_entry = c2i_unverified_entry; 645 #ifdef ASSERT 646 _saved_code = NULL; 647 _saved_code_length = 0; 648 #endif 649 } 650 651 void deallocate(); 652 653 // should never be used 654 AdapterHandlerEntry(); 655 656 public: 657 address get_i2c_entry() const { return _i2c_entry; } 658 address get_c2i_entry() const { return _c2i_entry; } 659 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 660 address base_address(); 661 void relocate(address new_base); 662 663 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 664 665 AdapterHandlerEntry* next() { 666 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 667 } 668 669 #ifdef ASSERT 670 // Used to verify that code generated for shared adapters is equivalent 671 void save_code (unsigned char* code, int length); 672 bool compare_code(unsigned char* code, int length); 673 #endif 674 675 //virtual void print_on(outputStream* st) const; DO NOT USE 676 void print_adapter_on(outputStream* st) const; 677 }; 678 679 class CDSAdapterHandlerEntry: public AdapterHandlerEntry { 680 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region 681 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region 682 683 public: 684 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; } 685 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; } 686 void init() NOT_CDS_RETURN; 687 }; 688 689 690 class AdapterHandlerLibrary: public AllStatic { 691 private: 692 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 693 static AdapterHandlerTable* _adapters; 694 static AdapterHandlerEntry* _abstract_method_handler; 695 static BufferBlob* buffer_blob(); 696 static void initialize(); 697 static AdapterHandlerEntry* get_adapter0(const methodHandle& method); 698 699 public: 700 701 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 702 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 703 static void create_native_wrapper(const methodHandle& method); 704 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 705 706 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 707 static void print_handler_on(outputStream* st, const CodeBlob* b); 708 static bool contains(const CodeBlob* b); 709 #ifndef PRODUCT 710 static void print_statistics(); 711 #endif // PRODUCT 712 713 }; 714 715 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP