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 #if INCLUDE_JVMCI 203 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, nmethod* nm, int deopt_reason); 204 #endif 205 206 // Shared stub locations 207 static address get_poll_stub(address pc); 208 209 static address get_ic_miss_stub() { 210 assert(_ic_miss_blob!= NULL, "oops"); 211 return _ic_miss_blob->entry_point(); 212 } 213 214 static address get_handle_wrong_method_stub() { 215 assert(_wrong_method_blob!= NULL, "oops"); 216 return _wrong_method_blob->entry_point(); 217 } 218 219 static address get_handle_wrong_method_abstract_stub() { 220 assert(_wrong_method_abstract_blob!= NULL, "oops"); 221 return _wrong_method_abstract_blob->entry_point(); 222 } 223 224 #ifdef COMPILER2 225 static void generate_uncommon_trap_blob(void); 226 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 227 #endif // COMPILER2 228 229 static address get_resolve_opt_virtual_call_stub() { 230 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 231 return _resolve_opt_virtual_call_blob->entry_point(); 232 } 233 static address get_resolve_virtual_call_stub() { 234 assert(_resolve_virtual_call_blob != NULL, "oops"); 235 return _resolve_virtual_call_blob->entry_point(); 236 } 237 static address get_resolve_static_call_stub() { 238 assert(_resolve_static_call_blob != NULL, "oops"); 239 return _resolve_static_call_blob->entry_point(); 240 } 241 242 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 243 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 244 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 245 246 // Counters 247 #ifndef PRODUCT 248 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 249 #endif // PRODUCT 250 251 // Helper routine for full-speed JVMTI exception throwing support 252 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 253 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 254 255 // RedefineClasses() tracing support for obsolete method entry 256 static int rc_trace_method_entry(JavaThread* thread, Method* m); 257 258 // To be used as the entry point for unresolved native methods. 259 static address native_method_throw_unsatisfied_link_error_entry(); 260 static address native_method_throw_unsupported_operation_exception_entry(); 261 262 // bytecode tracing is only used by the TraceBytecodes 263 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 264 265 static oop retrieve_receiver(Symbol* sig, frame caller); 266 267 static void register_finalizer(JavaThread* thread, oopDesc* obj); 268 269 // dtrace notifications 270 static int dtrace_object_alloc(oopDesc* o, int size); 271 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size); 272 static int dtrace_method_entry(JavaThread* thread, Method* m); 273 static int dtrace_method_exit(JavaThread* thread, Method* m); 274 275 // Utility method for retrieving the Java thread id, returns 0 if the 276 // thread is not a well formed Java thread. 277 static jlong get_java_tid(Thread* thread); 278 279 280 // used by native wrappers to reenable yellow if overflow happened in native code 281 static void reguard_yellow_pages(); 282 283 // Fill in the "X cannot be cast to a Y" message for ClassCastException 284 // 285 // @param thr the current thread 286 // @param name the name of the class of the object attempted to be cast 287 // @return the dynamically allocated exception message (must be freed 288 // by the caller using a resource mark) 289 // 290 // BCP must refer to the current 'checkcast' opcode for the frame 291 // on top of the stack. 292 // The caller (or one of it's callers) must use a ResourceMark 293 // in order to correctly free the result. 294 // 295 static char* generate_class_cast_message(JavaThread* thr, const char* name); 296 297 // Fill in the "X cannot be cast to a Y" message for ClassCastException 298 // 299 // @param name the name of the class of the object attempted to be cast 300 // @param klass the name of the target klass attempt 301 // @param gripe the specific kind of problem being reported 302 // @return the dynamically allocated exception message (must be freed 303 // by the caller using a resource mark) 304 // 305 // This version does not require access the frame, so it can be called 306 // from interpreted code 307 // The caller (or one of it's callers) must use a ResourceMark 308 // in order to correctly free the result. 309 // 310 static char* generate_class_cast_message(const char* name, const char* klass, 311 const char* gripe = " cannot be cast to "); 312 313 // Resolves a call site- may patch in the destination of the call into the 314 // compiled code. 315 static methodHandle resolve_helper(JavaThread *thread, 316 bool is_virtual, 317 bool is_optimized, TRAPS); 318 319 private: 320 // deopt blob 321 static void generate_deopt_blob(void); 322 323 public: 324 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 325 326 // Resets a call-site in compiled code so it will get resolved again. 327 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 328 329 // In the code prolog, if the klass comparison fails, the inline cache 330 // misses and the call site is patched to megamorphic 331 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 332 333 // Find the method that called us. 334 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 335 336 337 private: 338 static Handle find_callee_info(JavaThread* thread, 339 Bytecodes::Code& bc, 340 CallInfo& callinfo, TRAPS); 341 static Handle find_callee_info_helper(JavaThread* thread, 342 vframeStream& vfst, 343 Bytecodes::Code& bc, 344 CallInfo& callinfo, TRAPS); 345 346 static address clean_virtual_call_entry(); 347 static address clean_opt_virtual_call_entry(); 348 static address clean_static_call_entry(); 349 350 public: 351 352 // Read the array of BasicTypes from a Java signature, and compute where 353 // compiled Java code would like to put the results. Values in reg_lo and 354 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 355 // registers, those above refer to 4-byte stack slots. All stack slots are 356 // based off of the window top. SharedInfo::stack0 refers to the first usable 357 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 358 // 4-bytes higher. So for sparc because the register window save area is at 359 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 360 // will be just above it. ( 361 // return value is the maximum number of VMReg stack slots the convention will use. 362 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing); 363 364 static void check_member_name_argument_is_last_argument(const methodHandle& method, 365 const BasicType* sig_bt, 366 const VMRegPair* regs) NOT_DEBUG_RETURN; 367 368 // Ditto except for calling C 369 // 370 // C argument in register AND stack slot. 371 // Some architectures require that an argument must be passed in a register 372 // AND in a stack slot. These architectures provide a second VMRegPair array 373 // to be filled by the c_calling_convention method. On other architectures, 374 // NULL is being passed as the second VMRegPair array, so arguments are either 375 // passed in a register OR in a stack slot. 376 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2, 377 int total_args_passed); 378 379 // Compute the new number of arguments in the signature if 32 bit ints 380 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs 381 // is true. 382 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt); 383 // Adapt a method's signature if it contains 32 bit integers that must 384 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs 385 // is true. 386 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count, 387 BasicType*& in_sig_bt, VMRegPair*& in_regs); 388 389 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 390 // blobs. Unlike adapters in the tiger and earlier releases the code in these 391 // blobs does not create a new frame and are therefore virtually invisible 392 // to the stack walking code. In general these blobs extend the callers stack 393 // as needed for the conversion of argument locations. 394 395 // When calling a c2i blob the code will always call the interpreter even if 396 // by the time we reach the blob there is compiled code available. This allows 397 // the blob to pass the incoming stack pointer (the sender sp) in a known 398 // location for the interpreter to record. This is used by the frame code 399 // to correct the sender code to match up with the stack pointer when the 400 // thread left the compiled code. In addition it allows the interpreter 401 // to remove the space the c2i adapter allocated to do its argument conversion. 402 403 // Although a c2i blob will always run interpreted even if compiled code is 404 // present if we see that compiled code is present the compiled call site 405 // will be patched/re-resolved so that later calls will run compiled. 406 407 // Additionally a c2i blob need to have a unverified entry because it can be reached 408 // in situations where the call site is an inlined cache site and may go megamorphic. 409 410 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 411 // that the interpreter before it does any call dispatch will record the current 412 // stack pointer in the interpreter frame. On return it will restore the stack 413 // pointer as needed. This means the i2c adapter code doesn't need any special 414 // handshaking path with compiled code to keep the stack walking correct. 415 416 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 417 int total_args_passed, 418 int max_arg, 419 const BasicType *sig_bt, 420 const VMRegPair *regs, 421 AdapterFingerPrint* fingerprint); 422 423 static void gen_i2c_adapter(MacroAssembler *_masm, 424 int total_args_passed, 425 int comp_args_on_stack, 426 const BasicType *sig_bt, 427 const VMRegPair *regs); 428 429 // OSR support 430 431 // OSR_migration_begin will extract the jvm state from an interpreter 432 // frame (locals, monitors) and store the data in a piece of C heap 433 // storage. This then allows the interpreter frame to be removed from the 434 // stack and the OSR nmethod to be called. That method is called with a 435 // pointer to the C heap storage. This pointer is the return value from 436 // OSR_migration_begin. 437 438 static intptr_t* OSR_migration_begin(JavaThread *thread); 439 440 // OSR_migration_end is a trivial routine. It is called after the compiled 441 // method has extracted the jvm state from the C heap that OSR_migration_begin 442 // created. It's entire job is to simply free this storage. 443 static void OSR_migration_end(intptr_t* buf); 444 445 // Convert a sig into a calling convention register layout 446 // and find interesting things about it. 447 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 448 static VMReg name_for_receiver(); 449 450 // "Top of Stack" slots that may be unused by the calling convention but must 451 // otherwise be preserved. 452 // On Intel these are not necessary and the value can be zero. 453 // On Sparc this describes the words reserved for storing a register window 454 // when an interrupt occurs. 455 static uint out_preserve_stack_slots(); 456 457 // Is vector's size (in bytes) bigger than a size saved by default? 458 // For example, on x86 16 bytes XMM registers are saved by default. 459 static bool is_wide_vector(int size); 460 461 // Save and restore a native result 462 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 463 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 464 465 // Generate a native wrapper for a given method. The method takes arguments 466 // in the Java compiled code convention, marshals them to the native 467 // convention (handlizes oops, etc), transitions to native, makes the call, 468 // returns to java state (possibly blocking), unhandlizes any result and 469 // returns. 470 // 471 // The wrapper may contain special-case code if the given method 472 // is a JNI critical method, or a compiled method handle adapter, 473 // such as _invokeBasic, _linkToVirtual, etc. 474 static nmethod* generate_native_wrapper(MacroAssembler* masm, 475 const methodHandle& method, 476 int compile_id, 477 BasicType* sig_bt, 478 VMRegPair* regs, 479 BasicType ret_type); 480 481 // Block before entering a JNI critical method 482 static void block_for_jni_critical(JavaThread* thread); 483 484 // A compiled caller has just called the interpreter, but compiled code 485 // exists. Patch the caller so he no longer calls into the interpreter. 486 static void fixup_callers_callsite(Method* moop, address ret_pc); 487 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 488 489 // Slow-path Locking and Unlocking 490 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 491 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 492 493 // Resolving of calls 494 static address resolve_static_call_C (JavaThread *thread); 495 static address resolve_virtual_call_C (JavaThread *thread); 496 static address resolve_opt_virtual_call_C(JavaThread *thread); 497 498 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 499 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 500 oopDesc* dest, jint dest_pos, 501 jint length, JavaThread* thread); 502 503 // handle ic miss with caller being compiled code 504 // wrong method handling (inline cache misses, zombie methods) 505 static address handle_wrong_method(JavaThread* thread); 506 static address handle_wrong_method_abstract(JavaThread* thread); 507 static address handle_wrong_method_ic_miss(JavaThread* thread); 508 509 #ifndef PRODUCT 510 511 // Collect and print inline cache miss statistics 512 private: 513 enum { maxICmiss_count = 100 }; 514 static int _ICmiss_index; // length of IC miss histogram 515 static int _ICmiss_count[maxICmiss_count]; // miss counts 516 static address _ICmiss_at[maxICmiss_count]; // miss addresses 517 static void trace_ic_miss(address at); 518 519 public: 520 static int _throw_null_ctr; // throwing a null-pointer exception 521 static int _ic_miss_ctr; // total # of IC misses 522 static int _wrong_method_ctr; 523 static int _resolve_static_ctr; 524 static int _resolve_virtual_ctr; 525 static int _resolve_opt_virtual_ctr; 526 static int _implicit_null_throws; 527 static int _implicit_div0_throws; 528 529 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 530 static int _jshort_array_copy_ctr; // Slow-path short array copy 531 static int _jint_array_copy_ctr; // Slow-path int array copy 532 static int _jlong_array_copy_ctr; // Slow-path long array copy 533 static int _oop_array_copy_ctr; // Slow-path oop array copy 534 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 535 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 536 static int _generic_array_copy_ctr; // Slow-path includes type decoding 537 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 538 539 static int _new_instance_ctr; // 'new' object requires GC 540 static int _new_array_ctr; // 'new' array requires GC 541 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 542 static int _find_handler_ctr; // find exception handler 543 static int _rethrow_ctr; // rethrow exception 544 static int _mon_enter_stub_ctr; // monitor enter stub 545 static int _mon_exit_stub_ctr; // monitor exit stub 546 static int _mon_enter_ctr; // monitor enter slow 547 static int _mon_exit_ctr; // monitor exit slow 548 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 549 550 // Statistics code 551 // stats for "normal" compiled calls (non-interface) 552 static int _nof_normal_calls; // total # of calls 553 static int _nof_optimized_calls; // total # of statically-bound calls 554 static int _nof_inlined_calls; // total # of inlined normal calls 555 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 556 static int _nof_inlined_static_calls; // total # of inlined static calls 557 // stats for compiled interface calls 558 static int _nof_interface_calls; // total # of compiled calls 559 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 560 static int _nof_inlined_interface_calls; // total # of inlined interface calls 561 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 562 // stats for runtime exceptions 563 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 564 565 public: // for compiler 566 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 567 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 568 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 569 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 570 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 571 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 572 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 573 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 574 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 575 static void print_call_statistics(int comp_total); 576 static void print_statistics(); 577 static void print_ic_miss_histogram(); 578 579 #endif // PRODUCT 580 }; 581 582 583 // --------------------------------------------------------------------------- 584 // Implementation of AdapterHandlerLibrary 585 // 586 // This library manages argument marshaling adapters and native wrappers. 587 // There are 2 flavors of adapters: I2C and C2I. 588 // 589 // The I2C flavor takes a stock interpreted call setup, marshals the 590 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 591 // code_begin(). It is broken to call it without an nmethod assigned. 592 // The usual behavior is to lift any register arguments up out of the 593 // stack and possibly re-pack the extra arguments to be contiguous. 594 // I2C adapters will save what the interpreter's stack pointer will be 595 // after arguments are popped, then adjust the interpreter's frame 596 // size to force alignment and possibly to repack the arguments. 597 // After re-packing, it jumps to the compiled code start. There are 598 // no safepoints in this adapter code and a GC cannot happen while 599 // marshaling is in progress. 600 // 601 // The C2I flavor takes a stock compiled call setup plus the target method in 602 // Rmethod, marshals the arguments for an interpreted call and jumps to 603 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 604 // setup. Compiled frames are fixed-size and the args are likely not in the 605 // right place. Hence all the args will likely be copied into the 606 // interpreter's frame, forcing that frame to grow. The compiled frame's 607 // outgoing stack args will be dead after the copy. 608 // 609 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 610 // also perform an official frame push & pop. They have a call to the native 611 // routine in their middles and end in a return (instead of ending in a jump). 612 // The native wrappers are stored in real nmethods instead of the BufferBlobs 613 // used by the adapters. The code generation happens here because it's very 614 // similar to what the adapters have to do. 615 616 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 617 friend class AdapterHandlerTable; 618 619 private: 620 AdapterFingerPrint* _fingerprint; 621 address _i2c_entry; 622 address _c2i_entry; 623 address _c2i_unverified_entry; 624 625 #ifdef ASSERT 626 // Captures code and signature used to generate this adapter when 627 // verifying adapter equivalence. 628 unsigned char* _saved_code; 629 int _saved_code_length; 630 #endif 631 632 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 633 _fingerprint = fingerprint; 634 _i2c_entry = i2c_entry; 635 _c2i_entry = c2i_entry; 636 _c2i_unverified_entry = c2i_unverified_entry; 637 #ifdef ASSERT 638 _saved_code = NULL; 639 _saved_code_length = 0; 640 #endif 641 } 642 643 void deallocate(); 644 645 // should never be used 646 AdapterHandlerEntry(); 647 648 public: 649 address get_i2c_entry() const { return _i2c_entry; } 650 address get_c2i_entry() const { return _c2i_entry; } 651 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 652 address base_address(); 653 void relocate(address new_base); 654 655 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 656 657 AdapterHandlerEntry* next() { 658 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 659 } 660 661 #ifdef ASSERT 662 // Used to verify that code generated for shared adapters is equivalent 663 void save_code (unsigned char* code, int length); 664 bool compare_code(unsigned char* code, int length); 665 #endif 666 667 //virtual void print_on(outputStream* st) const; DO NOT USE 668 void print_adapter_on(outputStream* st) const; 669 }; 670 671 class AdapterHandlerLibrary: public AllStatic { 672 private: 673 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 674 static AdapterHandlerTable* _adapters; 675 static AdapterHandlerEntry* _abstract_method_handler; 676 static BufferBlob* buffer_blob(); 677 static void initialize(); 678 679 public: 680 681 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 682 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 683 static void create_native_wrapper(const methodHandle& method); 684 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 685 686 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 687 static void print_handler_on(outputStream* st, const CodeBlob* b); 688 static bool contains(const CodeBlob* b); 689 #ifndef PRODUCT 690 static void print_statistics(); 691 #endif // PRODUCT 692 693 }; 694 695 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP