1 /* 2 * Copyright (c) 1997, 2015, 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 "runtime/threadLocalStorage.hpp" 34 #include "utilities/hashtable.hpp" 35 #include "utilities/macros.hpp" 36 37 class AdapterHandlerEntry; 38 class AdapterHandlerTable; 39 class AdapterFingerPrint; 40 class vframeStream; 41 42 // Runtime is the base class for various runtime interfaces 43 // (InterpreterRuntime, CompilerRuntime, etc.). It provides 44 // shared functionality such as exception forwarding (C++ to 45 // Java exceptions), locking/unlocking mechanisms, statistical 46 // information, etc. 47 48 class SharedRuntime: AllStatic { 49 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 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 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 #ifdef __SOFTFP__ 105 static jfloat fadd(jfloat x, jfloat y); 106 static jfloat fsub(jfloat x, jfloat y); 107 static jfloat fmul(jfloat x, jfloat y); 108 static jfloat fdiv(jfloat x, jfloat y); 109 110 static jdouble dadd(jdouble x, jdouble y); 111 static jdouble dsub(jdouble x, jdouble y); 112 static jdouble dmul(jdouble x, jdouble y); 113 static jdouble ddiv(jdouble x, jdouble y); 114 #endif // __SOFTFP__ 115 116 // float conversion (needs to set appropriate rounding mode) 117 static jint f2i (jfloat x); 118 static jlong f2l (jfloat x); 119 static jint d2i (jdouble x); 120 static jlong d2l (jdouble x); 121 static jfloat d2f (jdouble x); 122 static jfloat l2f (jlong x); 123 static jdouble l2d (jlong x); 124 125 #ifdef __SOFTFP__ 126 static jfloat i2f (jint x); 127 static jdouble i2d (jint x); 128 static jdouble f2d (jfloat x); 129 #endif // __SOFTFP__ 130 131 // double trigonometrics and transcendentals 132 static jdouble dsin(jdouble x); 133 static jdouble dcos(jdouble x); 134 static jdouble dtan(jdouble x); 135 static jdouble dlog(jdouble x); 136 static jdouble dlog10(jdouble x); 137 static jdouble dexp(jdouble x); 138 static jdouble dpow(jdouble x, jdouble y); 139 140 #if defined(__SOFTFP__) || defined(E500V2) 141 static double dabs(double f); 142 #endif 143 144 #if defined(__SOFTFP__) || defined(PPC32) 145 static double dsqrt(double f); 146 #endif 147 148 // Montgomery multiplication 149 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 150 jint len, jlong inv, jint *m_ints); 151 static void montgomery_square(jint *a_ints, jint *n_ints, 152 jint len, jlong inv, jint *m_ints); 153 154 #ifdef __SOFTFP__ 155 // C++ compiler generates soft float instructions as well as passing 156 // float and double in registers. 157 static int fcmpl(float x, float y); 158 static int fcmpg(float x, float y); 159 static int dcmpl(double x, double y); 160 static int dcmpg(double x, double y); 161 162 static int unordered_fcmplt(float x, float y); 163 static int unordered_dcmplt(double x, double y); 164 static int unordered_fcmple(float x, float y); 165 static int unordered_dcmple(double x, double y); 166 static int unordered_fcmpge(float x, float y); 167 static int unordered_dcmpge(double x, double y); 168 static int unordered_fcmpgt(float x, float y); 169 static int unordered_dcmpgt(double x, double y); 170 171 static float fneg(float f); 172 static double dneg(double f); 173 #endif 174 175 // exception handling across interpreter/compiler boundaries 176 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 177 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 178 179 #if INCLUDE_ALL_GCS 180 // G1 write barriers 181 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 182 static void g1_wb_post(void* card_addr, JavaThread* thread); 183 #endif // INCLUDE_ALL_GCS 184 185 // exception handling and implicit exceptions 186 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 187 bool force_unwind, bool top_frame_only); 188 enum ImplicitExceptionKind { 189 IMPLICIT_NULL, 190 IMPLICIT_DIVIDE_BY_ZERO, 191 STACK_OVERFLOW 192 }; 193 static void throw_AbstractMethodError(JavaThread* thread); 194 static void throw_IncompatibleClassChangeError(JavaThread* thread); 195 static void throw_ArithmeticException(JavaThread* thread); 196 static void throw_NullPointerException(JavaThread* thread); 197 static void throw_NullPointerException_at_call(JavaThread* thread); 198 static void throw_StackOverflowError(JavaThread* thread); 199 static address continuation_for_implicit_exception(JavaThread* thread, 200 address faulting_pc, 201 ImplicitExceptionKind exception_kind); 202 203 // Shared stub locations 204 static address get_poll_stub(address pc); 205 206 static address get_ic_miss_stub() { 207 assert(_ic_miss_blob!= NULL, "oops"); 208 return _ic_miss_blob->entry_point(); 209 } 210 211 static address get_handle_wrong_method_stub() { 212 assert(_wrong_method_blob!= NULL, "oops"); 213 return _wrong_method_blob->entry_point(); 214 } 215 216 static address get_handle_wrong_method_abstract_stub() { 217 assert(_wrong_method_abstract_blob!= NULL, "oops"); 218 return _wrong_method_abstract_blob->entry_point(); 219 } 220 221 #ifdef COMPILER2 222 static void generate_uncommon_trap_blob(void); 223 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 224 #endif // COMPILER2 225 226 static address get_resolve_opt_virtual_call_stub() { 227 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 228 return _resolve_opt_virtual_call_blob->entry_point(); 229 } 230 static address get_resolve_virtual_call_stub() { 231 assert(_resolve_virtual_call_blob != NULL, "oops"); 232 return _resolve_virtual_call_blob->entry_point(); 233 } 234 static address get_resolve_static_call_stub() { 235 assert(_resolve_static_call_blob != NULL, "oops"); 236 return _resolve_static_call_blob->entry_point(); 237 } 238 239 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 240 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 241 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 242 243 // Counters 244 #ifndef PRODUCT 245 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 246 #endif // PRODUCT 247 248 // Helper routine for full-speed JVMTI exception throwing support 249 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 250 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 251 252 // RedefineClasses() tracing support for obsolete method entry 253 static int rc_trace_method_entry(JavaThread* thread, Method* m); 254 255 // To be used as the entry point for unresolved native methods. 256 static address native_method_throw_unsatisfied_link_error_entry(); 257 static address native_method_throw_unsupported_operation_exception_entry(); 258 259 // bytecode tracing is only used by the TraceBytecodes 260 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 261 262 static oop retrieve_receiver(Symbol* sig, frame caller); 263 264 static void register_finalizer(JavaThread* thread, oopDesc* obj); 265 266 // dtrace notifications 267 static int dtrace_object_alloc(oopDesc* o, int size); 268 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size); 269 static int dtrace_method_entry(JavaThread* thread, Method* m); 270 static int dtrace_method_exit(JavaThread* thread, Method* m); 271 272 // Utility method for retrieving the Java thread id, returns 0 if the 273 // thread is not a well formed Java thread. 274 static jlong get_java_tid(Thread* thread); 275 276 277 // used by native wrappers to reenable yellow if overflow happened in native code 278 static void reguard_yellow_pages(); 279 280 // Fill in the "X cannot be cast to a Y" message for ClassCastException 281 // 282 // @param thr the current thread 283 // @param name the name of the class of the object attempted to be cast 284 // @return the dynamically allocated exception message (must be freed 285 // by the caller using a resource mark) 286 // 287 // BCP must refer to the current 'checkcast' opcode for the frame 288 // on top of the stack. 289 // The caller (or one of it's callers) must use a ResourceMark 290 // in order to correctly free the result. 291 // 292 static char* generate_class_cast_message(JavaThread* thr, const char* name); 293 294 // Fill in the "X cannot be cast to a Y" message for ClassCastException 295 // 296 // @param name the name of the class of the object attempted to be cast 297 // @param klass the name of the target klass attempt 298 // @param gripe the specific kind of problem being reported 299 // @return the dynamically allocated exception message (must be freed 300 // by the caller using a resource mark) 301 // 302 // This version does not require access the frame, so it can be called 303 // from interpreted code 304 // The caller (or one of it's callers) must use a ResourceMark 305 // in order to correctly free the result. 306 // 307 static char* generate_class_cast_message(const char* name, const char* klass, 308 const char* gripe = " cannot be cast to "); 309 310 // Resolves a call site- may patch in the destination of the call into the 311 // compiled code. 312 static methodHandle resolve_helper(JavaThread *thread, 313 bool is_virtual, 314 bool is_optimized, TRAPS); 315 316 private: 317 // deopt blob 318 static void generate_deopt_blob(void); 319 320 public: 321 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 322 323 // Resets a call-site in compiled code so it will get resolved again. 324 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 325 326 // In the code prolog, if the klass comparison fails, the inline cache 327 // misses and the call site is patched to megamorphic 328 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 329 330 // Find the method that called us. 331 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 332 333 334 private: 335 static Handle find_callee_info(JavaThread* thread, 336 Bytecodes::Code& bc, 337 CallInfo& callinfo, TRAPS); 338 static Handle find_callee_info_helper(JavaThread* thread, 339 vframeStream& vfst, 340 Bytecodes::Code& bc, 341 CallInfo& callinfo, TRAPS); 342 343 static address clean_virtual_call_entry(); 344 static address clean_opt_virtual_call_entry(); 345 static address clean_static_call_entry(); 346 347 public: 348 349 // Read the array of BasicTypes from a Java signature, and compute where 350 // compiled Java code would like to put the results. Values in reg_lo and 351 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 352 // registers, those above refer to 4-byte stack slots. All stack slots are 353 // based off of the window top. SharedInfo::stack0 refers to the first usable 354 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 355 // 4-bytes higher. So for sparc because the register window save area is at 356 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 357 // will be just above it. ( 358 // return value is the maximum number of VMReg stack slots the convention will use. 359 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing); 360 361 static void check_member_name_argument_is_last_argument(methodHandle method, 362 const BasicType* sig_bt, 363 const VMRegPair* regs) NOT_DEBUG_RETURN; 364 365 // Ditto except for calling C 366 // 367 // C argument in register AND stack slot. 368 // Some architectures require that an argument must be passed in a register 369 // AND in a stack slot. These architectures provide a second VMRegPair array 370 // to be filled by the c_calling_convention method. On other architectures, 371 // NULL is being passed as the second VMRegPair array, so arguments are either 372 // passed in a register OR in a stack slot. 373 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2, 374 int total_args_passed); 375 376 // Compute the new number of arguments in the signature if 32 bit ints 377 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs 378 // is true. 379 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt); 380 // Adapt a method's signature if it contains 32 bit integers that must 381 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs 382 // is true. 383 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count, 384 BasicType*& in_sig_bt, VMRegPair*& in_regs); 385 386 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 387 // blobs. Unlike adapters in the tiger and earlier releases the code in these 388 // blobs does not create a new frame and are therefore virtually invisible 389 // to the stack walking code. In general these blobs extend the callers stack 390 // as needed for the conversion of argument locations. 391 392 // When calling a c2i blob the code will always call the interpreter even if 393 // by the time we reach the blob there is compiled code available. This allows 394 // the blob to pass the incoming stack pointer (the sender sp) in a known 395 // location for the interpreter to record. This is used by the frame code 396 // to correct the sender code to match up with the stack pointer when the 397 // thread left the compiled code. In addition it allows the interpreter 398 // to remove the space the c2i adapter allocated to do its argument conversion. 399 400 // Although a c2i blob will always run interpreted even if compiled code is 401 // present if we see that compiled code is present the compiled call site 402 // will be patched/re-resolved so that later calls will run compiled. 403 404 // Additionally a c2i blob need to have a unverified entry because it can be reached 405 // in situations where the call site is an inlined cache site and may go megamorphic. 406 407 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 408 // that the interpreter before it does any call dispatch will record the current 409 // stack pointer in the interpreter frame. On return it will restore the stack 410 // pointer as needed. This means the i2c adapter code doesn't need any special 411 // handshaking path with compiled code to keep the stack walking correct. 412 413 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 414 int total_args_passed, 415 int max_arg, 416 const BasicType *sig_bt, 417 const VMRegPair *regs, 418 AdapterFingerPrint* fingerprint); 419 420 // OSR support 421 422 // OSR_migration_begin will extract the jvm state from an interpreter 423 // frame (locals, monitors) and store the data in a piece of C heap 424 // storage. This then allows the interpreter frame to be removed from the 425 // stack and the OSR nmethod to be called. That method is called with a 426 // pointer to the C heap storage. This pointer is the return value from 427 // OSR_migration_begin. 428 429 static intptr_t* OSR_migration_begin(JavaThread *thread); 430 431 // OSR_migration_end is a trivial routine. It is called after the compiled 432 // method has extracted the jvm state from the C heap that OSR_migration_begin 433 // created. It's entire job is to simply free this storage. 434 static void OSR_migration_end(intptr_t* buf); 435 436 // Convert a sig into a calling convention register layout 437 // and find interesting things about it. 438 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 439 static VMReg name_for_receiver(); 440 441 // "Top of Stack" slots that may be unused by the calling convention but must 442 // otherwise be preserved. 443 // On Intel these are not necessary and the value can be zero. 444 // On Sparc this describes the words reserved for storing a register window 445 // when an interrupt occurs. 446 static uint out_preserve_stack_slots(); 447 448 // Is vector's size (in bytes) bigger than a size saved by default? 449 // For example, on x86 16 bytes XMM registers are saved by default. 450 static bool is_wide_vector(int size); 451 452 // Save and restore a native result 453 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 454 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 455 456 // Generate a native wrapper for a given method. The method takes arguments 457 // in the Java compiled code convention, marshals them to the native 458 // convention (handlizes oops, etc), transitions to native, makes the call, 459 // returns to java state (possibly blocking), unhandlizes any result and 460 // returns. 461 // 462 // The wrapper may contain special-case code if the given method 463 // is a JNI critical method, or a compiled method handle adapter, 464 // such as _invokeBasic, _linkToVirtual, etc. 465 static nmethod* generate_native_wrapper(MacroAssembler* masm, 466 methodHandle method, 467 int compile_id, 468 BasicType* sig_bt, 469 VMRegPair* regs, 470 BasicType ret_type); 471 472 // Block before entering a JNI critical method 473 static void block_for_jni_critical(JavaThread* thread); 474 475 // A compiled caller has just called the interpreter, but compiled code 476 // exists. Patch the caller so he no longer calls into the interpreter. 477 static void fixup_callers_callsite(Method* moop, address ret_pc); 478 479 // Slow-path Locking and Unlocking 480 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 481 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 482 483 // Resolving of calls 484 static address resolve_static_call_C (JavaThread *thread); 485 static address resolve_virtual_call_C (JavaThread *thread); 486 static address resolve_opt_virtual_call_C(JavaThread *thread); 487 488 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 489 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 490 oopDesc* dest, jint dest_pos, 491 jint length, JavaThread* thread); 492 493 // handle ic miss with caller being compiled code 494 // wrong method handling (inline cache misses, zombie methods) 495 static address handle_wrong_method(JavaThread* thread); 496 static address handle_wrong_method_abstract(JavaThread* thread); 497 static address handle_wrong_method_ic_miss(JavaThread* thread); 498 499 #ifndef PRODUCT 500 501 // Collect and print inline cache miss statistics 502 private: 503 enum { maxICmiss_count = 100 }; 504 static int _ICmiss_index; // length of IC miss histogram 505 static int _ICmiss_count[maxICmiss_count]; // miss counts 506 static address _ICmiss_at[maxICmiss_count]; // miss addresses 507 static void trace_ic_miss(address at); 508 509 public: 510 static int _throw_null_ctr; // throwing a null-pointer exception 511 static int _ic_miss_ctr; // total # of IC misses 512 static int _wrong_method_ctr; 513 static int _resolve_static_ctr; 514 static int _resolve_virtual_ctr; 515 static int _resolve_opt_virtual_ctr; 516 static int _implicit_null_throws; 517 static int _implicit_div0_throws; 518 519 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 520 static int _jshort_array_copy_ctr; // Slow-path short array copy 521 static int _jint_array_copy_ctr; // Slow-path int array copy 522 static int _jlong_array_copy_ctr; // Slow-path long array copy 523 static int _oop_array_copy_ctr; // Slow-path oop array copy 524 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 525 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 526 static int _generic_array_copy_ctr; // Slow-path includes type decoding 527 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 528 529 static int _new_instance_ctr; // 'new' object requires GC 530 static int _new_array_ctr; // 'new' array requires GC 531 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 532 static int _find_handler_ctr; // find exception handler 533 static int _rethrow_ctr; // rethrow exception 534 static int _mon_enter_stub_ctr; // monitor enter stub 535 static int _mon_exit_stub_ctr; // monitor exit stub 536 static int _mon_enter_ctr; // monitor enter slow 537 static int _mon_exit_ctr; // monitor exit slow 538 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 539 540 // Statistics code 541 // stats for "normal" compiled calls (non-interface) 542 static int _nof_normal_calls; // total # of calls 543 static int _nof_optimized_calls; // total # of statically-bound calls 544 static int _nof_inlined_calls; // total # of inlined normal calls 545 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 546 static int _nof_inlined_static_calls; // total # of inlined static calls 547 // stats for compiled interface calls 548 static int _nof_interface_calls; // total # of compiled calls 549 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 550 static int _nof_inlined_interface_calls; // total # of inlined interface calls 551 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 552 // stats for runtime exceptions 553 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 554 555 public: // for compiler 556 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 557 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 558 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 559 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 560 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 561 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 562 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 563 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 564 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 565 static void print_call_statistics(int comp_total); 566 static void print_statistics(); 567 static void print_ic_miss_histogram(); 568 569 #endif // PRODUCT 570 }; 571 572 573 // --------------------------------------------------------------------------- 574 // Implementation of AdapterHandlerLibrary 575 // 576 // This library manages argument marshaling adapters and native wrappers. 577 // There are 2 flavors of adapters: I2C and C2I. 578 // 579 // The I2C flavor takes a stock interpreted call setup, marshals the 580 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 581 // code_begin(). It is broken to call it without an nmethod assigned. 582 // The usual behavior is to lift any register arguments up out of the 583 // stack and possibly re-pack the extra arguments to be contiguous. 584 // I2C adapters will save what the interpreter's stack pointer will be 585 // after arguments are popped, then adjust the interpreter's frame 586 // size to force alignment and possibly to repack the arguments. 587 // After re-packing, it jumps to the compiled code start. There are 588 // no safepoints in this adapter code and a GC cannot happen while 589 // marshaling is in progress. 590 // 591 // The C2I flavor takes a stock compiled call setup plus the target method in 592 // Rmethod, marshals the arguments for an interpreted call and jumps to 593 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 594 // setup. Compiled frames are fixed-size and the args are likely not in the 595 // right place. Hence all the args will likely be copied into the 596 // interpreter's frame, forcing that frame to grow. The compiled frame's 597 // outgoing stack args will be dead after the copy. 598 // 599 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 600 // also perform an official frame push & pop. They have a call to the native 601 // routine in their middles and end in a return (instead of ending in a jump). 602 // The native wrappers are stored in real nmethods instead of the BufferBlobs 603 // used by the adapters. The code generation happens here because it's very 604 // similar to what the adapters have to do. 605 606 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 607 friend class AdapterHandlerTable; 608 609 private: 610 AdapterFingerPrint* _fingerprint; 611 address _i2c_entry; 612 address _c2i_entry; 613 address _c2i_unverified_entry; 614 615 #ifdef ASSERT 616 // Captures code and signature used to generate this adapter when 617 // verifying adapter equivalence. 618 unsigned char* _saved_code; 619 int _saved_code_length; 620 #endif 621 622 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 623 _fingerprint = fingerprint; 624 _i2c_entry = i2c_entry; 625 _c2i_entry = c2i_entry; 626 _c2i_unverified_entry = c2i_unverified_entry; 627 #ifdef ASSERT 628 _saved_code = NULL; 629 _saved_code_length = 0; 630 #endif 631 } 632 633 void deallocate(); 634 635 // should never be used 636 AdapterHandlerEntry(); 637 638 public: 639 address get_i2c_entry() const { return _i2c_entry; } 640 address get_c2i_entry() const { return _c2i_entry; } 641 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 642 address base_address(); 643 void relocate(address new_base); 644 645 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 646 647 AdapterHandlerEntry* next() { 648 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 649 } 650 651 #ifdef ASSERT 652 // Used to verify that code generated for shared adapters is equivalent 653 void save_code (unsigned char* code, int length); 654 bool compare_code(unsigned char* code, int length); 655 #endif 656 657 //virtual void print_on(outputStream* st) const; DO NOT USE 658 void print_adapter_on(outputStream* st) const; 659 }; 660 661 class AdapterHandlerLibrary: public AllStatic { 662 private: 663 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 664 static AdapterHandlerTable* _adapters; 665 static AdapterHandlerEntry* _abstract_method_handler; 666 static BufferBlob* buffer_blob(); 667 static void initialize(); 668 669 public: 670 671 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 672 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 673 static void create_native_wrapper(methodHandle method); 674 static AdapterHandlerEntry* get_adapter(methodHandle method); 675 676 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); } 677 static void print_handler_on(outputStream* st, CodeBlob* b); 678 static bool contains(CodeBlob* b); 679 #ifndef PRODUCT 680 static void print_statistics(); 681 #endif // PRODUCT 682 683 }; 684 685 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP