1 /* 2 * Copyright (c) 1997, 2011, 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 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 private: 49 static methodHandle resolve_sub_helper(JavaThread *thread, 50 bool is_virtual, 51 bool is_optimized, TRAPS); 52 53 // Shared stub locations 54 55 static RuntimeStub* _wrong_method_blob; 56 static RuntimeStub* _ic_miss_blob; 57 static RuntimeStub* _resolve_opt_virtual_call_blob; 58 static RuntimeStub* _resolve_virtual_call_blob; 59 static RuntimeStub* _resolve_static_call_blob; 60 61 static DeoptimizationBlob* _deopt_blob; 62 static RicochetBlob* _ricochet_blob; 63 64 static SafepointBlob* _polling_page_safepoint_handler_blob; 65 static SafepointBlob* _polling_page_return_handler_blob; 66 67 #ifdef COMPILER2 68 static UncommonTrapBlob* _uncommon_trap_blob; 69 #endif // COMPILER2 70 71 #ifndef PRODUCT 72 // Counters 73 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 74 #endif // !PRODUCT 75 76 private: 77 static SafepointBlob* generate_handler_blob(address call_ptr, bool cause_return); 78 static RuntimeStub* generate_resolve_blob(address destination, const char* name); 79 80 public: 81 static void generate_stubs(void); 82 83 // max bytes for each dtrace string parameter 84 enum { max_dtrace_string_size = 256 }; 85 86 // The following arithmetic routines are used on platforms that do 87 // not have machine instructions to implement their functionality. 88 // Do not remove these. 89 90 // long arithmetics 91 static jlong lmul(jlong y, jlong x); 92 static jlong ldiv(jlong y, jlong x); 93 static jlong lrem(jlong y, jlong x); 94 95 // float and double remainder 96 static jfloat frem(jfloat x, jfloat y); 97 static jdouble drem(jdouble x, jdouble y); 98 99 #ifdef __SOFTFP__ 100 static jfloat fadd(jfloat x, jfloat y); 101 static jfloat fsub(jfloat x, jfloat y); 102 static jfloat fmul(jfloat x, jfloat y); 103 static jfloat fdiv(jfloat x, jfloat y); 104 105 static jdouble dadd(jdouble x, jdouble y); 106 static jdouble dsub(jdouble x, jdouble y); 107 static jdouble dmul(jdouble x, jdouble y); 108 static jdouble ddiv(jdouble x, jdouble y); 109 #endif // __SOFTFP__ 110 111 // float conversion (needs to set appropriate rounding mode) 112 static jint f2i (jfloat x); 113 static jlong f2l (jfloat x); 114 static jint d2i (jdouble x); 115 static jlong d2l (jdouble x); 116 static jfloat d2f (jdouble x); 117 static jfloat l2f (jlong x); 118 static jdouble l2d (jlong x); 119 120 #ifdef __SOFTFP__ 121 static jfloat i2f (jint x); 122 static jdouble i2d (jint x); 123 static jdouble f2d (jfloat x); 124 #endif // __SOFTFP__ 125 126 // double trigonometrics and transcendentals 127 static jdouble dsin(jdouble x); 128 static jdouble dcos(jdouble x); 129 static jdouble dtan(jdouble x); 130 static jdouble dlog(jdouble x); 131 static jdouble dlog10(jdouble x); 132 static jdouble dexp(jdouble x); 133 static jdouble dpow(jdouble x, jdouble y); 134 135 #if defined(__SOFTFP__) || defined(E500V2) 136 static double dabs(double f); 137 #endif 138 139 #if defined(__SOFTFP__) || defined(PPC) 140 static double dsqrt(double f); 141 #endif 142 143 #ifdef __SOFTFP__ 144 // C++ compiler generates soft float instructions as well as passing 145 // float and double in registers. 146 static int fcmpl(float x, float y); 147 static int fcmpg(float x, float y); 148 static int dcmpl(double x, double y); 149 static int dcmpg(double x, double y); 150 151 static int unordered_fcmplt(float x, float y); 152 static int unordered_dcmplt(double x, double y); 153 static int unordered_fcmple(float x, float y); 154 static int unordered_dcmple(double x, double y); 155 static int unordered_fcmpge(float x, float y); 156 static int unordered_dcmpge(double x, double y); 157 static int unordered_fcmpgt(float x, float y); 158 static int unordered_dcmpgt(double x, double y); 159 160 static float fneg(float f); 161 static double dneg(double f); 162 #endif 163 164 // exception handling across interpreter/compiler boundaries 165 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 166 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 167 168 #ifndef SERIALGC 169 // G1 write barriers 170 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 171 static void g1_wb_post(void* card_addr, JavaThread* thread); 172 #endif // !SERIALGC 173 174 // exception handling and implicit exceptions 175 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 176 bool force_unwind, bool top_frame_only); 177 enum ImplicitExceptionKind { 178 IMPLICIT_NULL, 179 IMPLICIT_DIVIDE_BY_ZERO, 180 STACK_OVERFLOW 181 }; 182 static void throw_AbstractMethodError(JavaThread* thread); 183 static void throw_IncompatibleClassChangeError(JavaThread* thread); 184 static void throw_ArithmeticException(JavaThread* thread); 185 static void throw_NullPointerException(JavaThread* thread); 186 static void throw_NullPointerException_at_call(JavaThread* thread); 187 static void throw_StackOverflowError(JavaThread* thread); 188 static address continuation_for_implicit_exception(JavaThread* thread, 189 address faulting_pc, 190 ImplicitExceptionKind exception_kind); 191 192 // Shared stub locations 193 static address get_poll_stub(address pc); 194 195 static address get_ic_miss_stub() { 196 assert(_ic_miss_blob!= NULL, "oops"); 197 return _ic_miss_blob->entry_point(); 198 } 199 200 static address get_handle_wrong_method_stub() { 201 assert(_wrong_method_blob!= NULL, "oops"); 202 return _wrong_method_blob->entry_point(); 203 } 204 205 #ifdef COMPILER2 206 static void generate_uncommon_trap_blob(void); 207 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 208 #endif // COMPILER2 209 210 static address get_resolve_opt_virtual_call_stub(){ 211 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 212 return _resolve_opt_virtual_call_blob->entry_point(); 213 } 214 static address get_resolve_virtual_call_stub() { 215 assert(_resolve_virtual_call_blob != NULL, "oops"); 216 return _resolve_virtual_call_blob->entry_point(); 217 } 218 static address get_resolve_static_call_stub() { 219 assert(_resolve_static_call_blob != NULL, "oops"); 220 return _resolve_static_call_blob->entry_point(); 221 } 222 223 static RicochetBlob* ricochet_blob() { 224 #ifdef X86 225 // Currently only implemented on x86 226 assert(!EnableInvokeDynamic || _ricochet_blob != NULL, "oops"); 227 #endif 228 return _ricochet_blob; 229 } 230 231 static void generate_ricochet_blob(); 232 233 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 234 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 235 236 // Counters 237 #ifndef PRODUCT 238 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 239 #endif // PRODUCT 240 241 // Helper routine for full-speed JVMTI exception throwing support 242 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 243 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 244 245 // RedefineClasses() tracing support for obsolete method entry 246 static int rc_trace_method_entry(JavaThread* thread, methodOopDesc* m); 247 248 // To be used as the entry point for unresolved native methods. 249 static address native_method_throw_unsatisfied_link_error_entry(); 250 251 // bytecode tracing is only used by the TraceBytecodes 252 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 253 254 // Used to back off a spin lock that is under heavy contention 255 static void yield_all(JavaThread* thread, int attempts = 0); 256 257 static oop retrieve_receiver( Symbol* sig, frame caller ); 258 259 static void register_finalizer(JavaThread* thread, oopDesc* obj); 260 261 // dtrace notifications 262 static int dtrace_object_alloc(oopDesc* o); 263 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o); 264 static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m); 265 static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m); 266 267 // Utility method for retrieving the Java thread id, returns 0 if the 268 // thread is not a well formed Java thread. 269 static jlong get_java_tid(Thread* thread); 270 271 272 // used by native wrappers to reenable yellow if overflow happened in native code 273 static void reguard_yellow_pages(); 274 275 /** 276 * Fill in the "X cannot be cast to a Y" message for ClassCastException 277 * 278 * @param thr the current thread 279 * @param name the name of the class of the object attempted to be cast 280 * @return the dynamically allocated exception message (must be freed 281 * by the caller using a resource mark) 282 * 283 * BCP must refer to the current 'checkcast' opcode for the frame 284 * on top of the stack. 285 * The caller (or one of it's callers) must use a ResourceMark 286 * in order to correctly free the result. 287 */ 288 static char* generate_class_cast_message(JavaThread* thr, const char* name); 289 290 /** 291 * Fill in the message for a WrongMethodTypeException 292 * 293 * @param thr the current thread 294 * @param mtype (optional) expected method type (or argument class) 295 * @param mhandle (optional) actual method handle (or argument) 296 * @return the dynamically allocated exception message 297 * 298 * BCP for the frame on top of the stack must refer to an 299 * 'invokevirtual' op for a method handle, or an 'invokedyamic' op. 300 * The caller (or one of its callers) must use a ResourceMark 301 * in order to correctly free the result. 302 */ 303 static char* generate_wrong_method_type_message(JavaThread* thr, 304 oopDesc* mtype = NULL, 305 oopDesc* mhandle = NULL); 306 307 /** Return non-null if the mtype is a klass or Class, not a MethodType. */ 308 static oop wrong_method_type_is_for_single_argument(JavaThread* thr, 309 oopDesc* mtype); 310 311 /** 312 * Fill in the "X cannot be cast to a Y" message for ClassCastException 313 * 314 * @param name the name of the class of the object attempted to be cast 315 * @param klass the name of the target klass attempt 316 * @param gripe the specific kind of problem being reported 317 * @return the dynamically allocated exception message (must be freed 318 * by the caller using a resource mark) 319 * 320 * This version does not require access the frame, so it can be called 321 * from interpreted code 322 * The caller (or one of it's callers) must use a ResourceMark 323 * in order to correctly free the result. 324 */ 325 static char* generate_class_cast_message(const char* name, const char* klass, 326 const char* gripe = " cannot be cast to "); 327 328 // Resolves a call site- may patch in the destination of the call into the 329 // compiled code. 330 static methodHandle resolve_helper(JavaThread *thread, 331 bool is_virtual, 332 bool is_optimized, TRAPS); 333 334 private: 335 // deopt blob 336 static void generate_deopt_blob(void); 337 338 public: 339 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 340 341 // Resets a call-site in compiled code so it will get resolved again. 342 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 343 344 // In the code prolog, if the klass comparison fails, the inline cache 345 // misses and the call site is patched to megamorphic 346 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 347 348 // Find the method that called us. 349 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 350 351 352 private: 353 static Handle find_callee_info(JavaThread* thread, 354 Bytecodes::Code& bc, 355 CallInfo& callinfo, TRAPS); 356 static Handle find_callee_info_helper(JavaThread* thread, 357 vframeStream& vfst, 358 Bytecodes::Code& bc, 359 CallInfo& callinfo, TRAPS); 360 361 static address clean_virtual_call_entry(); 362 static address clean_opt_virtual_call_entry(); 363 static address clean_static_call_entry(); 364 365 public: 366 367 // Read the array of BasicTypes from a Java signature, and compute where 368 // compiled Java code would like to put the results. Values in reg_lo and 369 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 370 // registers, those above refer to 4-byte stack slots. All stack slots are 371 // based off of the window top. SharedInfo::stack0 refers to the first usable 372 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 373 // 4-bytes higher. So for sparc because the register window save area is at 374 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 375 // will be just above it. ( 376 // return value is the maximum number of VMReg stack slots the convention will use. 377 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing); 378 379 // Ditto except for calling C 380 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed); 381 382 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 383 // blobs. Unlike adapters in the tiger and earlier releases the code in these 384 // blobs does not create a new frame and are therefore virtually invisible 385 // to the stack walking code. In general these blobs extend the callers stack 386 // as needed for the conversion of argument locations. 387 388 // When calling a c2i blob the code will always call the interpreter even if 389 // by the time we reach the blob there is compiled code available. This allows 390 // the blob to pass the incoming stack pointer (the sender sp) in a known 391 // location for the interpreter to record. This is used by the frame code 392 // to correct the sender code to match up with the stack pointer when the 393 // thread left the compiled code. In addition it allows the interpreter 394 // to remove the space the c2i adapter allocated to do it argument conversion. 395 396 // Although a c2i blob will always run interpreted even if compiled code is 397 // present if we see that compiled code is present the compiled call site 398 // will be patched/re-resolved so that later calls will run compiled. 399 400 // Aditionally a c2i blob need to have a unverified entry because it can be reached 401 // in situations where the call site is an inlined cache site and may go megamorphic. 402 403 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 404 // that the interpreter before it does any call dispatch will record the current 405 // stack pointer in the interpreter frame. On return it will restore the stack 406 // pointer as needed. This means the i2c adapter code doesn't need any special 407 // handshaking path with compiled code to keep the stack walking correct. 408 409 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 410 int total_args_passed, 411 int max_arg, 412 const BasicType *sig_bt, 413 const VMRegPair *regs, 414 AdapterFingerPrint* fingerprint); 415 416 // OSR support 417 418 // OSR_migration_begin will extract the jvm state from an interpreter 419 // frame (locals, monitors) and store the data in a piece of C heap 420 // storage. This then allows the interpreter frame to be removed from the 421 // stack and the OSR nmethod to be called. That method is called with a 422 // pointer to the C heap storage. This pointer is the return value from 423 // OSR_migration_begin. 424 425 static intptr_t* OSR_migration_begin( JavaThread *thread); 426 427 // OSR_migration_end is a trivial routine. It is called after the compiled 428 // method has extracted the jvm state from the C heap that OSR_migration_begin 429 // created. It's entire job is to simply free this storage. 430 static void OSR_migration_end ( intptr_t* buf); 431 432 // Convert a sig into a calling convention register layout 433 // and find interesting things about it. 434 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, int *arg_size); 435 static VMReg name_for_receiver(); 436 437 // "Top of Stack" slots that may be unused by the calling convention but must 438 // otherwise be preserved. 439 // On Intel these are not necessary and the value can be zero. 440 // On Sparc this describes the words reserved for storing a register window 441 // when an interrupt occurs. 442 static uint out_preserve_stack_slots(); 443 444 // Save and restore a native result 445 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 446 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 447 448 // Generate a native wrapper for a given method. The method takes arguments 449 // in the Java compiled code convention, marshals them to the native 450 // convention (handlizes oops, etc), transitions to native, makes the call, 451 // returns to java state (possibly blocking), unhandlizes any result and 452 // returns. 453 static nmethod *generate_native_wrapper(MacroAssembler* masm, 454 methodHandle method, 455 int compile_id, 456 int total_args_passed, 457 int max_arg, 458 BasicType *sig_bt, 459 VMRegPair *regs, 460 BasicType ret_type ); 461 462 #ifdef HAVE_DTRACE_H 463 // Generate a dtrace wrapper for a given method. The method takes arguments 464 // in the Java compiled code convention, marshals them to the native 465 // convention (handlizes oops, etc), transitions to native, makes the call, 466 // returns to java state (possibly blocking), unhandlizes any result and 467 // returns. 468 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm, 469 methodHandle method); 470 471 // dtrace support to convert a Java string to utf8 472 static void get_utf(oopDesc* src, address dst); 473 #endif // def HAVE_DTRACE_H 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(methodOopDesc* 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); 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_ic_miss(JavaThread* thread); 497 498 #ifndef PRODUCT 499 500 // Collect and print inline cache miss statistics 501 private: 502 enum { maxICmiss_count = 100 }; 503 static int _ICmiss_index; // length of IC miss histogram 504 static int _ICmiss_count[maxICmiss_count]; // miss counts 505 static address _ICmiss_at[maxICmiss_count]; // miss addresses 506 static void trace_ic_miss(address at); 507 508 public: 509 static int _monitor_enter_ctr; // monitor enter slow 510 static int _monitor_exit_ctr; // monitor exit slow 511 static int _throw_null_ctr; // throwing a null-pointer exception 512 static int _ic_miss_ctr; // total # of IC misses 513 static int _wrong_method_ctr; 514 static int _resolve_static_ctr; 515 static int _resolve_virtual_ctr; 516 static int _resolve_opt_virtual_ctr; 517 static int _implicit_null_throws; 518 static int _implicit_div0_throws; 519 520 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 521 static int _jshort_array_copy_ctr; // Slow-path short array copy 522 static int _jint_array_copy_ctr; // Slow-path int array copy 523 static int _jlong_array_copy_ctr; // Slow-path long array copy 524 static int _oop_array_copy_ctr; // Slow-path oop array copy 525 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 526 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 527 static int _generic_array_copy_ctr; // Slow-path includes type decoding 528 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 529 530 static int _new_instance_ctr; // 'new' object requires GC 531 static int _new_array_ctr; // 'new' array requires GC 532 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 533 static int _find_handler_ctr; // find exception handler 534 static int _rethrow_ctr; // rethrow exception 535 static int _mon_enter_stub_ctr; // monitor enter stub 536 static int _mon_exit_stub_ctr; // monitor exit stub 537 static int _mon_enter_ctr; // monitor enter slow 538 static int _mon_exit_ctr; // monitor exit slow 539 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 540 541 // Statistics code 542 // stats for "normal" compiled calls (non-interface) 543 static int _nof_normal_calls; // total # of calls 544 static int _nof_optimized_calls; // total # of statically-bound calls 545 static int _nof_inlined_calls; // total # of inlined normal calls 546 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 547 static int _nof_inlined_static_calls; // total # of inlined static calls 548 // stats for compiled interface calls 549 static int _nof_interface_calls; // total # of compiled calls 550 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 551 static int _nof_inlined_interface_calls; // total # of inlined interface calls 552 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 553 // stats for runtime exceptions 554 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 555 556 public: // for compiler 557 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 558 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 559 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 560 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 561 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 562 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 563 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 564 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 565 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 566 static void print_call_statistics(int comp_total); 567 static void print_statistics(); 568 static void print_ic_miss_histogram(); 569 570 #endif // PRODUCT 571 }; 572 573 574 // --------------------------------------------------------------------------- 575 // Implementation of AdapterHandlerLibrary 576 // 577 // This library manages argument marshaling adapters and native wrappers. 578 // There are 2 flavors of adapters: I2C and C2I. 579 // 580 // The I2C flavor takes a stock interpreted call setup, marshals the 581 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 582 // code_begin(). It is broken to call it without an nmethod assigned. 583 // The usual behavior is to lift any register arguments up out of the 584 // stack and possibly re-pack the extra arguments to be contigious. 585 // I2C adapters will save what the interpreter's stack pointer will be 586 // after arguments are popped, then adjust the interpreter's frame 587 // size to force alignment and possibly to repack the arguments. 588 // After re-packing, it jumps to the compiled code start. There are 589 // no safepoints in this adapter code and a GC cannot happen while 590 // marshaling is in progress. 591 // 592 // The C2I flavor takes a stock compiled call setup plus the target method in 593 // Rmethod, marshals the arguments for an interpreted call and jumps to 594 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 595 // setup. Compiled frames are fixed-size and the args are likely not in the 596 // right place. Hence all the args will likely be copied into the 597 // interpreter's frame, forcing that frame to grow. The compiled frame's 598 // outgoing stack args will be dead after the copy. 599 // 600 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 601 // also perform an offical frame push & pop. They have a call to the native 602 // routine in their middles and end in a return (instead of ending in a jump). 603 // The native wrappers are stored in real nmethods instead of the BufferBlobs 604 // used by the adapters. The code generation happens here because it's very 605 // similar to what the adapters have to do. 606 607 class AdapterHandlerEntry : public BasicHashtableEntry { 608 friend class AdapterHandlerTable; 609 610 private: 611 AdapterFingerPrint* _fingerprint; 612 address _i2c_entry; 613 address _c2i_entry; 614 address _c2i_unverified_entry; 615 616 #ifdef ASSERT 617 // Captures code and signature used to generate this adapter when 618 // verifing adapter equivalence. 619 unsigned char* _saved_code; 620 int _code_length; 621 BasicType* _saved_sig; 622 int _total_args_passed; 623 #endif 624 625 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 626 _fingerprint = fingerprint; 627 _i2c_entry = i2c_entry; 628 _c2i_entry = c2i_entry; 629 _c2i_unverified_entry = c2i_unverified_entry; 630 #ifdef ASSERT 631 _saved_code = NULL; 632 _code_length = 0; 633 _saved_sig = NULL; 634 _total_args_passed = 0; 635 #endif 636 } 637 638 void deallocate(); 639 640 // should never be used 641 AdapterHandlerEntry(); 642 643 public: 644 address get_i2c_entry() { return _i2c_entry; } 645 address get_c2i_entry() { return _c2i_entry; } 646 address get_c2i_unverified_entry() { return _c2i_unverified_entry; } 647 648 void relocate(address new_base); 649 650 AdapterFingerPrint* fingerprint() { return _fingerprint; } 651 652 AdapterHandlerEntry* next() { 653 return (AdapterHandlerEntry*)BasicHashtableEntry::next(); 654 } 655 656 #ifdef ASSERT 657 // Used to verify that code generated for shared adapters is equivalent 658 void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt); 659 bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt); 660 #endif 661 662 void print(); 663 }; 664 665 class AdapterHandlerLibrary: public AllStatic { 666 private: 667 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 668 static AdapterHandlerTable* _adapters; 669 static AdapterHandlerEntry* _abstract_method_handler; 670 static BufferBlob* buffer_blob(); 671 static void initialize(); 672 673 public: 674 675 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 676 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 677 static nmethod* create_native_wrapper(methodHandle method, int compile_id); 678 static AdapterHandlerEntry* get_adapter(methodHandle method); 679 680 #ifdef HAVE_DTRACE_H 681 static nmethod* create_dtrace_nmethod (methodHandle method); 682 #endif // HAVE_DTRACE_H 683 684 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); } 685 static void print_handler_on(outputStream* st, CodeBlob* b); 686 static bool contains(CodeBlob* b); 687 #ifndef PRODUCT 688 static void print_statistics(); 689 #endif /* PRODUCT */ 690 691 }; 692 693 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP