1 /* 2 * Copyright (c) 1997, 2010, 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 class AdapterHandlerEntry; 26 class AdapterHandlerTable; 27 class AdapterFingerPrint; 28 class vframeStream; 29 30 // Runtime is the base class for various runtime interfaces 31 // (InterpreterRuntime, CompilerRuntime, etc.). It provides 32 // shared functionality such as exception forwarding (C++ to 33 // Java exceptions), locking/unlocking mechanisms, statistical 34 // information, etc. 35 36 class SharedRuntime: AllStatic { 37 private: 38 static methodHandle resolve_sub_helper(JavaThread *thread, 39 bool is_virtual, 40 bool is_optimized, TRAPS); 41 42 // Shared stub locations 43 44 static RuntimeStub* _wrong_method_blob; 45 static RuntimeStub* _ic_miss_blob; 46 static RuntimeStub* _resolve_opt_virtual_call_blob; 47 static RuntimeStub* _resolve_virtual_call_blob; 48 static RuntimeStub* _resolve_static_call_blob; 49 50 static SafepointBlob* _polling_page_safepoint_handler_blob; 51 static SafepointBlob* _polling_page_return_handler_blob; 52 #ifdef COMPILER2 53 static ExceptionBlob* _exception_blob; 54 static UncommonTrapBlob* _uncommon_trap_blob; 55 #endif // COMPILER2 56 57 #ifndef PRODUCT 58 59 // Counters 60 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 61 62 #endif // !PRODUCT 63 public: 64 65 // max bytes for each dtrace string parameter 66 enum { max_dtrace_string_size = 256 }; 67 68 // The following arithmetic routines are used on platforms that do 69 // not have machine instructions to implement their functionality. 70 // Do not remove these. 71 72 // long arithmetics 73 static jlong lmul(jlong y, jlong x); 74 static jlong ldiv(jlong y, jlong x); 75 static jlong lrem(jlong y, jlong x); 76 77 // float and double remainder 78 static jfloat frem(jfloat x, jfloat y); 79 static jdouble drem(jdouble x, jdouble y); 80 81 #ifdef __SOFTFP__ 82 static jfloat fadd(jfloat x, jfloat y); 83 static jfloat fsub(jfloat x, jfloat y); 84 static jfloat fmul(jfloat x, jfloat y); 85 static jfloat fdiv(jfloat x, jfloat y); 86 87 static jdouble dadd(jdouble x, jdouble y); 88 static jdouble dsub(jdouble x, jdouble y); 89 static jdouble dmul(jdouble x, jdouble y); 90 static jdouble ddiv(jdouble x, jdouble y); 91 #endif // __SOFTFP__ 92 93 // float conversion (needs to set appropriate rounding mode) 94 static jint f2i (jfloat x); 95 static jlong f2l (jfloat x); 96 static jint d2i (jdouble x); 97 static jlong d2l (jdouble x); 98 static jfloat d2f (jdouble x); 99 static jfloat l2f (jlong x); 100 static jdouble l2d (jlong x); 101 102 #ifdef __SOFTFP__ 103 static jfloat i2f (jint x); 104 static jdouble i2d (jint x); 105 static jdouble f2d (jfloat x); 106 #endif // __SOFTFP__ 107 108 // double trigonometrics and transcendentals 109 static jdouble dsin(jdouble x); 110 static jdouble dcos(jdouble x); 111 static jdouble dtan(jdouble x); 112 static jdouble dlog(jdouble x); 113 static jdouble dlog10(jdouble x); 114 static jdouble dexp(jdouble x); 115 static jdouble dpow(jdouble x, jdouble y); 116 117 #if defined(__SOFTFP__) || defined(E500V2) 118 static double dabs(double f); 119 #endif 120 121 #if defined(__SOFTFP__) || defined(PPC) 122 static double dsqrt(double f); 123 #endif 124 125 #ifdef __SOFTFP__ 126 // C++ compiler generates soft float instructions as well as passing 127 // float and double in registers. 128 static int fcmpl(float x, float y); 129 static int fcmpg(float x, float y); 130 static int dcmpl(double x, double y); 131 static int dcmpg(double x, double y); 132 133 static int unordered_fcmplt(float x, float y); 134 static int unordered_dcmplt(double x, double y); 135 static int unordered_fcmple(float x, float y); 136 static int unordered_dcmple(double x, double y); 137 static int unordered_fcmpge(float x, float y); 138 static int unordered_dcmpge(double x, double y); 139 static int unordered_fcmpgt(float x, float y); 140 static int unordered_dcmpgt(double x, double y); 141 142 static float fneg(float f); 143 static double dneg(double f); 144 #endif 145 146 // exception handling across interpreter/compiler boundaries 147 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 148 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 149 150 #ifndef SERIALGC 151 // G1 write barriers 152 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 153 static void g1_wb_post(void* card_addr, JavaThread* thread); 154 #endif // !SERIALGC 155 156 // exception handling and implicit exceptions 157 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 158 bool force_unwind, bool top_frame_only); 159 enum ImplicitExceptionKind { 160 IMPLICIT_NULL, 161 IMPLICIT_DIVIDE_BY_ZERO, 162 STACK_OVERFLOW 163 }; 164 static void throw_AbstractMethodError(JavaThread* thread); 165 static void throw_IncompatibleClassChangeError(JavaThread* thread); 166 static void throw_ArithmeticException(JavaThread* thread); 167 static void throw_NullPointerException(JavaThread* thread); 168 static void throw_NullPointerException_at_call(JavaThread* thread); 169 static void throw_StackOverflowError(JavaThread* thread); 170 static address continuation_for_implicit_exception(JavaThread* thread, 171 address faulting_pc, 172 ImplicitExceptionKind exception_kind); 173 174 // Shared stub locations 175 static address get_poll_stub(address pc); 176 177 static address get_ic_miss_stub() { 178 assert(_ic_miss_blob!= NULL, "oops"); 179 return _ic_miss_blob->entry_point(); 180 } 181 182 static address get_handle_wrong_method_stub() { 183 assert(_wrong_method_blob!= NULL, "oops"); 184 return _wrong_method_blob->entry_point(); 185 } 186 187 #ifdef COMPILER2 188 static void generate_uncommon_trap_blob(void); 189 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 190 #endif // COMPILER2 191 192 static address get_resolve_opt_virtual_call_stub(){ 193 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 194 return _resolve_opt_virtual_call_blob->entry_point(); 195 } 196 static address get_resolve_virtual_call_stub() { 197 assert(_resolve_virtual_call_blob != NULL, "oops"); 198 return _resolve_virtual_call_blob->entry_point(); 199 } 200 static address get_resolve_static_call_stub() { 201 assert(_resolve_static_call_blob != NULL, "oops"); 202 return _resolve_static_call_blob->entry_point(); 203 } 204 205 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 206 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 207 208 // Counters 209 #ifndef PRODUCT 210 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 211 #endif // PRODUCT 212 213 // Helper routine for full-speed JVMTI exception throwing support 214 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 215 static void throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message = NULL); 216 217 // RedefineClasses() tracing support for obsolete method entry 218 static int rc_trace_method_entry(JavaThread* thread, methodOopDesc* m); 219 220 // To be used as the entry point for unresolved native methods. 221 static address native_method_throw_unsatisfied_link_error_entry(); 222 223 // bytecode tracing is only used by the TraceBytecodes 224 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 225 226 // Used to back off a spin lock that is under heavy contention 227 static void yield_all(JavaThread* thread, int attempts = 0); 228 229 static oop retrieve_receiver( symbolHandle sig, frame caller ); 230 231 static void register_finalizer(JavaThread* thread, oopDesc* obj); 232 233 // dtrace notifications 234 static int dtrace_object_alloc(oopDesc* o); 235 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o); 236 static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m); 237 static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m); 238 239 // Utility method for retrieving the Java thread id, returns 0 if the 240 // thread is not a well formed Java thread. 241 static jlong get_java_tid(Thread* thread); 242 243 244 // used by native wrappers to reenable yellow if overflow happened in native code 245 static void reguard_yellow_pages(); 246 247 /** 248 * Fill in the "X cannot be cast to a Y" message for ClassCastException 249 * 250 * @param thr the current thread 251 * @param name the name of the class of the object attempted to be cast 252 * @return the dynamically allocated exception message (must be freed 253 * by the caller using a resource mark) 254 * 255 * BCP must refer to the current 'checkcast' opcode for the frame 256 * on top of the stack. 257 * The caller (or one of it's callers) must use a ResourceMark 258 * in order to correctly free the result. 259 */ 260 static char* generate_class_cast_message(JavaThread* thr, const char* name); 261 262 /** 263 * Fill in the message for a WrongMethodTypeException 264 * 265 * @param thr the current thread 266 * @param mtype (optional) expected method type (or argument class) 267 * @param mhandle (optional) actual method handle (or argument) 268 * @return the dynamically allocated exception message 269 * 270 * BCP for the frame on top of the stack must refer to an 271 * 'invokevirtual' op for a method handle, or an 'invokedyamic' op. 272 * The caller (or one of its callers) must use a ResourceMark 273 * in order to correctly free the result. 274 */ 275 static char* generate_wrong_method_type_message(JavaThread* thr, 276 oopDesc* mtype = NULL, 277 oopDesc* mhandle = NULL); 278 279 /** Return non-null if the mtype is a klass or Class, not a MethodType. */ 280 static oop wrong_method_type_is_for_single_argument(JavaThread* thr, 281 oopDesc* mtype); 282 283 /** 284 * Fill in the "X cannot be cast to a Y" message for ClassCastException 285 * 286 * @param name the name of the class of the object attempted to be cast 287 * @param klass the name of the target klass attempt 288 * @param gripe the specific kind of problem being reported 289 * @return the dynamically allocated exception message (must be freed 290 * by the caller using a resource mark) 291 * 292 * This version does not require access the frame, so it can be called 293 * from interpreted code 294 * The caller (or one of it's callers) must use a ResourceMark 295 * in order to correctly free the result. 296 */ 297 static char* generate_class_cast_message(const char* name, const char* klass, 298 const char* gripe = " cannot be cast to "); 299 300 // Resolves a call site- may patch in the destination of the call into the 301 // compiled code. 302 static methodHandle resolve_helper(JavaThread *thread, 303 bool is_virtual, 304 bool is_optimized, TRAPS); 305 306 static void generate_stubs(void); 307 308 private: 309 // deopt blob 310 static void generate_deopt_blob(void); 311 static DeoptimizationBlob* _deopt_blob; 312 313 public: 314 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 315 316 // Resets a call-site in compiled code so it will get resolved again. 317 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 318 319 // In the code prolog, if the klass comparison fails, the inline cache 320 // misses and the call site is patched to megamorphic 321 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 322 323 // Find the method that called us. 324 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 325 326 327 private: 328 static Handle find_callee_info(JavaThread* thread, 329 Bytecodes::Code& bc, 330 CallInfo& callinfo, TRAPS); 331 static Handle find_callee_info_helper(JavaThread* thread, 332 vframeStream& vfst, 333 Bytecodes::Code& bc, 334 CallInfo& callinfo, TRAPS); 335 336 static address clean_virtual_call_entry(); 337 static address clean_opt_virtual_call_entry(); 338 static address clean_static_call_entry(); 339 340 public: 341 342 // Read the array of BasicTypes from a Java signature, and compute where 343 // compiled Java code would like to put the results. Values in reg_lo and 344 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 345 // registers, those above refer to 4-byte stack slots. All stack slots are 346 // based off of the window top. SharedInfo::stack0 refers to the first usable 347 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 348 // 4-bytes higher. So for sparc because the register window save area is at 349 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 350 // will be just above it. ( 351 // return value is the maximum number of VMReg stack slots the convention will use. 352 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing); 353 354 // Ditto except for calling C 355 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed); 356 357 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 358 // blobs. Unlike adapters in the tiger and earlier releases the code in these 359 // blobs does not create a new frame and are therefore virtually invisible 360 // to the stack walking code. In general these blobs extend the callers stack 361 // as needed for the conversion of argument locations. 362 363 // When calling a c2i blob the code will always call the interpreter even if 364 // by the time we reach the blob there is compiled code available. This allows 365 // the blob to pass the incoming stack pointer (the sender sp) in a known 366 // location for the interpreter to record. This is used by the frame code 367 // to correct the sender code to match up with the stack pointer when the 368 // thread left the compiled code. In addition it allows the interpreter 369 // to remove the space the c2i adapter allocated to do it argument conversion. 370 371 // Although a c2i blob will always run interpreted even if compiled code is 372 // present if we see that compiled code is present the compiled call site 373 // will be patched/re-resolved so that later calls will run compiled. 374 375 // Aditionally a c2i blob need to have a unverified entry because it can be reached 376 // in situations where the call site is an inlined cache site and may go megamorphic. 377 378 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 379 // that the interpreter before it does any call dispatch will record the current 380 // stack pointer in the interpreter frame. On return it will restore the stack 381 // pointer as needed. This means the i2c adapter code doesn't need any special 382 // handshaking path with compiled code to keep the stack walking correct. 383 384 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 385 int total_args_passed, 386 int max_arg, 387 const BasicType *sig_bt, 388 const VMRegPair *regs, 389 AdapterFingerPrint* fingerprint); 390 391 // OSR support 392 393 // OSR_migration_begin will extract the jvm state from an interpreter 394 // frame (locals, monitors) and store the data in a piece of C heap 395 // storage. This then allows the interpreter frame to be removed from the 396 // stack and the OSR nmethod to be called. That method is called with a 397 // pointer to the C heap storage. This pointer is the return value from 398 // OSR_migration_begin. 399 400 static intptr_t* OSR_migration_begin( JavaThread *thread); 401 402 // OSR_migration_end is a trivial routine. It is called after the compiled 403 // method has extracted the jvm state from the C heap that OSR_migration_begin 404 // created. It's entire job is to simply free this storage. 405 static void OSR_migration_end ( intptr_t* buf); 406 407 // Convert a sig into a calling convention register layout 408 // and find interesting things about it. 409 static VMRegPair* find_callee_arguments(symbolOop sig, bool has_receiver, int *arg_size); 410 static VMReg name_for_receiver(); 411 412 // "Top of Stack" slots that may be unused by the calling convention but must 413 // otherwise be preserved. 414 // On Intel these are not necessary and the value can be zero. 415 // On Sparc this describes the words reserved for storing a register window 416 // when an interrupt occurs. 417 static uint out_preserve_stack_slots(); 418 419 // Save and restore a native result 420 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 421 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 422 423 // Generate a native wrapper for a given method. The method takes arguments 424 // in the Java compiled code convention, marshals them to the native 425 // convention (handlizes oops, etc), transitions to native, makes the call, 426 // returns to java state (possibly blocking), unhandlizes any result and 427 // returns. 428 static nmethod *generate_native_wrapper(MacroAssembler* masm, 429 methodHandle method, 430 int total_args_passed, 431 int max_arg, 432 BasicType *sig_bt, 433 VMRegPair *regs, 434 BasicType ret_type ); 435 436 #ifdef HAVE_DTRACE_H 437 // Generate a dtrace wrapper for a given method. The method takes arguments 438 // in the Java compiled code convention, marshals them to the native 439 // convention (handlizes oops, etc), transitions to native, makes the call, 440 // returns to java state (possibly blocking), unhandlizes any result and 441 // returns. 442 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm, 443 methodHandle method); 444 445 // dtrace support to convert a Java string to utf8 446 static void get_utf(oopDesc* src, address dst); 447 #endif // def HAVE_DTRACE_H 448 449 // A compiled caller has just called the interpreter, but compiled code 450 // exists. Patch the caller so he no longer calls into the interpreter. 451 static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc); 452 453 // Slow-path Locking and Unlocking 454 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 455 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock); 456 457 // Resolving of calls 458 static address resolve_static_call_C (JavaThread *thread); 459 static address resolve_virtual_call_C (JavaThread *thread); 460 static address resolve_opt_virtual_call_C(JavaThread *thread); 461 462 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 463 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 464 oopDesc* dest, jint dest_pos, 465 jint length, JavaThread* thread); 466 467 // handle ic miss with caller being compiled code 468 // wrong method handling (inline cache misses, zombie methods) 469 static address handle_wrong_method(JavaThread* thread); 470 static address handle_wrong_method_ic_miss(JavaThread* thread); 471 472 #ifndef PRODUCT 473 474 // Collect and print inline cache miss statistics 475 private: 476 enum { maxICmiss_count = 100 }; 477 static int _ICmiss_index; // length of IC miss histogram 478 static int _ICmiss_count[maxICmiss_count]; // miss counts 479 static address _ICmiss_at[maxICmiss_count]; // miss addresses 480 static void trace_ic_miss(address at); 481 482 public: 483 static int _monitor_enter_ctr; // monitor enter slow 484 static int _monitor_exit_ctr; // monitor exit slow 485 static int _throw_null_ctr; // throwing a null-pointer exception 486 static int _ic_miss_ctr; // total # of IC misses 487 static int _wrong_method_ctr; 488 static int _resolve_static_ctr; 489 static int _resolve_virtual_ctr; 490 static int _resolve_opt_virtual_ctr; 491 static int _implicit_null_throws; 492 static int _implicit_div0_throws; 493 494 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 495 static int _jshort_array_copy_ctr; // Slow-path short array copy 496 static int _jint_array_copy_ctr; // Slow-path int array copy 497 static int _jlong_array_copy_ctr; // Slow-path long array copy 498 static int _oop_array_copy_ctr; // Slow-path oop array copy 499 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 500 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 501 static int _generic_array_copy_ctr; // Slow-path includes type decoding 502 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 503 504 static int _new_instance_ctr; // 'new' object requires GC 505 static int _new_array_ctr; // 'new' array requires GC 506 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 507 static int _find_handler_ctr; // find exception handler 508 static int _rethrow_ctr; // rethrow exception 509 static int _mon_enter_stub_ctr; // monitor enter stub 510 static int _mon_exit_stub_ctr; // monitor exit stub 511 static int _mon_enter_ctr; // monitor enter slow 512 static int _mon_exit_ctr; // monitor exit slow 513 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 514 515 // Statistics code 516 // stats for "normal" compiled calls (non-interface) 517 static int _nof_normal_calls; // total # of calls 518 static int _nof_optimized_calls; // total # of statically-bound calls 519 static int _nof_inlined_calls; // total # of inlined normal calls 520 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 521 static int _nof_inlined_static_calls; // total # of inlined static calls 522 // stats for compiled interface calls 523 static int _nof_interface_calls; // total # of compiled calls 524 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 525 static int _nof_inlined_interface_calls; // total # of inlined interface calls 526 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 527 // stats for runtime exceptions 528 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 529 530 public: // for compiler 531 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 532 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 533 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 534 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 535 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 536 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 537 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 538 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 539 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 540 static void print_call_statistics(int comp_total); 541 static void print_statistics(); 542 static void print_ic_miss_histogram(); 543 544 #endif // PRODUCT 545 }; 546 547 548 // --------------------------------------------------------------------------- 549 // Implementation of AdapterHandlerLibrary 550 // 551 // This library manages argument marshaling adapters and native wrappers. 552 // There are 2 flavors of adapters: I2C and C2I. 553 // 554 // The I2C flavor takes a stock interpreted call setup, marshals the 555 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 556 // code_begin(). It is broken to call it without an nmethod assigned. 557 // The usual behavior is to lift any register arguments up out of the 558 // stack and possibly re-pack the extra arguments to be contigious. 559 // I2C adapters will save what the interpreter's stack pointer will be 560 // after arguments are popped, then adjust the interpreter's frame 561 // size to force alignment and possibly to repack the arguments. 562 // After re-packing, it jumps to the compiled code start. There are 563 // no safepoints in this adapter code and a GC cannot happen while 564 // marshaling is in progress. 565 // 566 // The C2I flavor takes a stock compiled call setup plus the target method in 567 // Rmethod, marshals the arguments for an interpreted call and jumps to 568 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 569 // setup. Compiled frames are fixed-size and the args are likely not in the 570 // right place. Hence all the args will likely be copied into the 571 // interpreter's frame, forcing that frame to grow. The compiled frame's 572 // outgoing stack args will be dead after the copy. 573 // 574 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 575 // also perform an offical frame push & pop. They have a call to the native 576 // routine in their middles and end in a return (instead of ending in a jump). 577 // The native wrappers are stored in real nmethods instead of the BufferBlobs 578 // used by the adapters. The code generation happens here because it's very 579 // similar to what the adapters have to do. 580 581 class AdapterHandlerEntry : public BasicHashtableEntry { 582 friend class AdapterHandlerTable; 583 584 private: 585 AdapterFingerPrint* _fingerprint; 586 address _i2c_entry; 587 address _c2i_entry; 588 address _c2i_unverified_entry; 589 590 #ifdef ASSERT 591 // Captures code and signature used to generate this adapter when 592 // verifing adapter equivalence. 593 unsigned char* _saved_code; 594 int _code_length; 595 BasicType* _saved_sig; 596 int _total_args_passed; 597 #endif 598 599 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 600 _fingerprint = fingerprint; 601 _i2c_entry = i2c_entry; 602 _c2i_entry = c2i_entry; 603 _c2i_unverified_entry = c2i_unverified_entry; 604 #ifdef ASSERT 605 _saved_code = NULL; 606 _code_length = 0; 607 _saved_sig = NULL; 608 _total_args_passed = 0; 609 #endif 610 } 611 612 void deallocate(); 613 614 // should never be used 615 AdapterHandlerEntry(); 616 617 public: 618 address get_i2c_entry() { return _i2c_entry; } 619 address get_c2i_entry() { return _c2i_entry; } 620 address get_c2i_unverified_entry() { return _c2i_unverified_entry; } 621 622 void relocate(address new_base); 623 624 AdapterFingerPrint* fingerprint() { return _fingerprint; } 625 626 AdapterHandlerEntry* next() { 627 return (AdapterHandlerEntry*)BasicHashtableEntry::next(); 628 } 629 630 #ifdef ASSERT 631 // Used to verify that code generated for shared adapters is equivalent 632 void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt); 633 bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt); 634 #endif 635 636 void print(); 637 }; 638 639 class AdapterHandlerLibrary: public AllStatic { 640 private: 641 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 642 static AdapterHandlerTable* _adapters; 643 static AdapterHandlerEntry* _abstract_method_handler; 644 static BufferBlob* buffer_blob(); 645 static void initialize(); 646 647 public: 648 649 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 650 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 651 static nmethod* create_native_wrapper(methodHandle method); 652 static AdapterHandlerEntry* get_adapter(methodHandle method); 653 654 #ifdef HAVE_DTRACE_H 655 static nmethod* create_dtrace_nmethod (methodHandle method); 656 #endif // HAVE_DTRACE_H 657 658 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); } 659 static void print_handler_on(outputStream* st, CodeBlob* b); 660 static bool contains(CodeBlob* b); 661 #ifndef PRODUCT 662 static void print_statistics(); 663 #endif /* PRODUCT */ 664 665 };