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 #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 SafepointBlob* _polling_page_safepoint_handler_blob; 62 static SafepointBlob* _polling_page_return_handler_blob; 63 #ifdef COMPILER2 64 static ExceptionBlob* _exception_blob; 65 static UncommonTrapBlob* _uncommon_trap_blob; 66 #endif // COMPILER2 67 68 #ifndef PRODUCT 69 70 // Counters 71 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 72 73 #endif // !PRODUCT 74 public: 75 76 // max bytes for each dtrace string parameter 77 enum { max_dtrace_string_size = 256 }; 78 79 // The following arithmetic routines are used on platforms that do 80 // not have machine instructions to implement their functionality. 81 // Do not remove these. 82 83 // long arithmetics 84 static jlong lmul(jlong y, jlong x); 85 static jlong ldiv(jlong y, jlong x); 86 static jlong lrem(jlong y, jlong x); 87 88 // float and double remainder 89 static jfloat frem(jfloat x, jfloat y); 90 static jdouble drem(jdouble x, jdouble y); 91 92 #ifdef __SOFTFP__ 93 static jfloat fadd(jfloat x, jfloat y); 94 static jfloat fsub(jfloat x, jfloat y); 95 static jfloat fmul(jfloat x, jfloat y); 96 static jfloat fdiv(jfloat x, jfloat y); 97 98 static jdouble dadd(jdouble x, jdouble y); 99 static jdouble dsub(jdouble x, jdouble y); 100 static jdouble dmul(jdouble x, jdouble y); 101 static jdouble ddiv(jdouble x, jdouble y); 102 #endif // __SOFTFP__ 103 104 // float conversion (needs to set appropriate rounding mode) 105 static jint f2i (jfloat x); 106 static jlong f2l (jfloat x); 107 static jint d2i (jdouble x); 108 static jlong d2l (jdouble x); 109 static jfloat d2f (jdouble x); 110 static jfloat l2f (jlong x); 111 static jdouble l2d (jlong x); 112 113 #ifdef __SOFTFP__ 114 static jfloat i2f (jint x); 115 static jdouble i2d (jint x); 116 static jdouble f2d (jfloat x); 117 #endif // __SOFTFP__ 118 119 // double trigonometrics and transcendentals 120 static jdouble dsin(jdouble x); 121 static jdouble dcos(jdouble x); 122 static jdouble dtan(jdouble x); 123 static jdouble dlog(jdouble x); 124 static jdouble dlog10(jdouble x); 125 static jdouble dexp(jdouble x); 126 static jdouble dpow(jdouble x, jdouble y); 127 128 #if defined(__SOFTFP__) || defined(E500V2) 129 static double dabs(double f); 130 #endif 131 132 #if defined(__SOFTFP__) || defined(PPC) 133 static double dsqrt(double f); 134 #endif 135 136 #ifdef __SOFTFP__ 137 // C++ compiler generates soft float instructions as well as passing 138 // float and double in registers. 139 static int fcmpl(float x, float y); 140 static int fcmpg(float x, float y); 141 static int dcmpl(double x, double y); 142 static int dcmpg(double x, double y); 143 144 static int unordered_fcmplt(float x, float y); 145 static int unordered_dcmplt(double x, double y); 146 static int unordered_fcmple(float x, float y); 147 static int unordered_dcmple(double x, double y); 148 static int unordered_fcmpge(float x, float y); 149 static int unordered_dcmpge(double x, double y); 150 static int unordered_fcmpgt(float x, float y); 151 static int unordered_dcmpgt(double x, double y); 152 153 static float fneg(float f); 154 static double dneg(double f); 155 #endif 156 157 // exception handling across interpreter/compiler boundaries 158 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 159 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 160 161 #ifndef SERIALGC 162 // G1 write barriers 163 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 164 static void g1_wb_post(void* card_addr, JavaThread* thread); 165 #endif // !SERIALGC 166 167 // exception handling and implicit exceptions 168 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 169 bool force_unwind, bool top_frame_only); 170 enum ImplicitExceptionKind { 171 IMPLICIT_NULL, 172 IMPLICIT_DIVIDE_BY_ZERO, 173 STACK_OVERFLOW 174 }; 175 static void throw_AbstractMethodError(JavaThread* thread); 176 static void throw_IncompatibleClassChangeError(JavaThread* thread); 177 static void throw_ArithmeticException(JavaThread* thread); 178 static void throw_NullPointerException(JavaThread* thread); 179 static void throw_NullPointerException_at_call(JavaThread* thread); 180 static void throw_StackOverflowError(JavaThread* thread); 181 static address continuation_for_implicit_exception(JavaThread* thread, 182 address faulting_pc, 183 ImplicitExceptionKind exception_kind); 184 185 // Shared stub locations 186 static address get_poll_stub(address pc); 187 188 static address get_ic_miss_stub() { 189 assert(_ic_miss_blob!= NULL, "oops"); 190 return _ic_miss_blob->entry_point(); 191 } 192 193 static address get_handle_wrong_method_stub() { 194 assert(_wrong_method_blob!= NULL, "oops"); 195 return _wrong_method_blob->entry_point(); 196 } 197 198 #ifdef COMPILER2 199 static void generate_uncommon_trap_blob(void); 200 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 201 #endif // COMPILER2 202 203 static address get_resolve_opt_virtual_call_stub(){ 204 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 205 return _resolve_opt_virtual_call_blob->entry_point(); 206 } 207 static address get_resolve_virtual_call_stub() { 208 assert(_resolve_virtual_call_blob != NULL, "oops"); 209 return _resolve_virtual_call_blob->entry_point(); 210 } 211 static address get_resolve_static_call_stub() { 212 assert(_resolve_static_call_blob != NULL, "oops"); 213 return _resolve_static_call_blob->entry_point(); 214 } 215 216 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 217 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 218 219 // Counters 220 #ifndef PRODUCT 221 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 222 #endif // PRODUCT 223 224 // Helper routine for full-speed JVMTI exception throwing support 225 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 226 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 227 228 // RedefineClasses() tracing support for obsolete method entry 229 static int rc_trace_method_entry(JavaThread* thread, methodOopDesc* m); 230 231 // To be used as the entry point for unresolved native methods. 232 static address native_method_throw_unsatisfied_link_error_entry(); 233 234 // bytecode tracing is only used by the TraceBytecodes 235 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 236 237 // Used to back off a spin lock that is under heavy contention 238 static void yield_all(JavaThread* thread, int attempts = 0); 239 240 static oop retrieve_receiver( Symbol* sig, frame caller ); 241 242 static void register_finalizer(JavaThread* thread, oopDesc* obj); 243 244 // dtrace notifications 245 static int dtrace_object_alloc(oopDesc* o); 246 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o); 247 static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m); 248 static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m); 249 250 // Utility method for retrieving the Java thread id, returns 0 if the 251 // thread is not a well formed Java thread. 252 static jlong get_java_tid(Thread* thread); 253 254 255 // used by native wrappers to reenable yellow if overflow happened in native code 256 static void reguard_yellow_pages(); 257 258 /** 259 * Fill in the "X cannot be cast to a Y" message for ClassCastException 260 * 261 * @param thr the current thread 262 * @param name the name of the class of the object attempted to be cast 263 * @return the dynamically allocated exception message (must be freed 264 * by the caller using a resource mark) 265 * 266 * BCP must refer to the current 'checkcast' opcode for the frame 267 * on top of the stack. 268 * The caller (or one of it's callers) must use a ResourceMark 269 * in order to correctly free the result. 270 */ 271 static char* generate_class_cast_message(JavaThread* thr, const char* name); 272 273 /** 274 * Fill in the message for a WrongMethodTypeException 275 * 276 * @param thr the current thread 277 * @param mtype (optional) expected method type (or argument class) 278 * @param mhandle (optional) actual method handle (or argument) 279 * @return the dynamically allocated exception message 280 * 281 * BCP for the frame on top of the stack must refer to an 282 * 'invokevirtual' op for a method handle, or an 'invokedyamic' op. 283 * The caller (or one of its callers) must use a ResourceMark 284 * in order to correctly free the result. 285 */ 286 static char* generate_wrong_method_type_message(JavaThread* thr, 287 oopDesc* mtype = NULL, 288 oopDesc* mhandle = NULL); 289 290 /** Return non-null if the mtype is a klass or Class, not a MethodType. */ 291 static oop wrong_method_type_is_for_single_argument(JavaThread* thr, 292 oopDesc* mtype); 293 294 /** 295 * Fill in the "X cannot be cast to a Y" message for ClassCastException 296 * 297 * @param name the name of the class of the object attempted to be cast 298 * @param klass the name of the target klass attempt 299 * @param gripe the specific kind of problem being reported 300 * @return the dynamically allocated exception message (must be freed 301 * by the caller using a resource mark) 302 * 303 * This version does not require access the frame, so it can be called 304 * from interpreted code 305 * The caller (or one of it's callers) must use a ResourceMark 306 * in order to correctly free the result. 307 */ 308 static char* generate_class_cast_message(const char* name, const char* klass, 309 const char* gripe = " cannot be cast to "); 310 311 // Resolves a call site- may patch in the destination of the call into the 312 // compiled code. 313 static methodHandle resolve_helper(JavaThread *thread, 314 bool is_virtual, 315 bool is_optimized, TRAPS); 316 317 static void generate_stubs(void); 318 319 private: 320 // deopt blob 321 static void generate_deopt_blob(void); 322 static DeoptimizationBlob* _deopt_blob; 323 324 public: 325 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 326 327 // Resets a call-site in compiled code so it will get resolved again. 328 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 329 330 // In the code prolog, if the klass comparison fails, the inline cache 331 // misses and the call site is patched to megamorphic 332 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 333 334 // Find the method that called us. 335 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 336 337 338 private: 339 static Handle find_callee_info(JavaThread* thread, 340 Bytecodes::Code& bc, 341 CallInfo& callinfo, TRAPS); 342 static Handle find_callee_info_helper(JavaThread* thread, 343 vframeStream& vfst, 344 Bytecodes::Code& bc, 345 CallInfo& callinfo, TRAPS); 346 347 static address clean_virtual_call_entry(); 348 static address clean_opt_virtual_call_entry(); 349 static address clean_static_call_entry(); 350 351 public: 352 353 // Read the array of BasicTypes from a Java signature, and compute where 354 // compiled Java code would like to put the results. Values in reg_lo and 355 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 356 // registers, those above refer to 4-byte stack slots. All stack slots are 357 // based off of the window top. SharedInfo::stack0 refers to the first usable 358 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 359 // 4-bytes higher. So for sparc because the register window save area is at 360 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 361 // will be just above it. ( 362 // return value is the maximum number of VMReg stack slots the convention will use. 363 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing); 364 365 // Ditto except for calling C 366 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed); 367 368 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 369 // blobs. Unlike adapters in the tiger and earlier releases the code in these 370 // blobs does not create a new frame and are therefore virtually invisible 371 // to the stack walking code. In general these blobs extend the callers stack 372 // as needed for the conversion of argument locations. 373 374 // When calling a c2i blob the code will always call the interpreter even if 375 // by the time we reach the blob there is compiled code available. This allows 376 // the blob to pass the incoming stack pointer (the sender sp) in a known 377 // location for the interpreter to record. This is used by the frame code 378 // to correct the sender code to match up with the stack pointer when the 379 // thread left the compiled code. In addition it allows the interpreter 380 // to remove the space the c2i adapter allocated to do it argument conversion. 381 382 // Although a c2i blob will always run interpreted even if compiled code is 383 // present if we see that compiled code is present the compiled call site 384 // will be patched/re-resolved so that later calls will run compiled. 385 386 // Aditionally a c2i blob need to have a unverified entry because it can be reached 387 // in situations where the call site is an inlined cache site and may go megamorphic. 388 389 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 390 // that the interpreter before it does any call dispatch will record the current 391 // stack pointer in the interpreter frame. On return it will restore the stack 392 // pointer as needed. This means the i2c adapter code doesn't need any special 393 // handshaking path with compiled code to keep the stack walking correct. 394 395 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 396 int total_args_passed, 397 int max_arg, 398 const BasicType *sig_bt, 399 const VMRegPair *regs, 400 AdapterFingerPrint* fingerprint); 401 402 // OSR support 403 404 // OSR_migration_begin will extract the jvm state from an interpreter 405 // frame (locals, monitors) and store the data in a piece of C heap 406 // storage. This then allows the interpreter frame to be removed from the 407 // stack and the OSR nmethod to be called. That method is called with a 408 // pointer to the C heap storage. This pointer is the return value from 409 // OSR_migration_begin. 410 411 static intptr_t* OSR_migration_begin( JavaThread *thread); 412 413 // OSR_migration_end is a trivial routine. It is called after the compiled 414 // method has extracted the jvm state from the C heap that OSR_migration_begin 415 // created. It's entire job is to simply free this storage. 416 static void OSR_migration_end ( intptr_t* buf); 417 418 // Convert a sig into a calling convention register layout 419 // and find interesting things about it. 420 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, int *arg_size); 421 static VMReg name_for_receiver(); 422 423 // "Top of Stack" slots that may be unused by the calling convention but must 424 // otherwise be preserved. 425 // On Intel these are not necessary and the value can be zero. 426 // On Sparc this describes the words reserved for storing a register window 427 // when an interrupt occurs. 428 static uint out_preserve_stack_slots(); 429 430 // Save and restore a native result 431 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 432 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 433 434 // Generate a native wrapper for a given method. The method takes arguments 435 // in the Java compiled code convention, marshals them to the native 436 // convention (handlizes oops, etc), transitions to native, makes the call, 437 // returns to java state (possibly blocking), unhandlizes any result and 438 // returns. 439 static nmethod *generate_native_wrapper(MacroAssembler* masm, 440 methodHandle method, 441 int total_args_passed, 442 int max_arg, 443 BasicType *sig_bt, 444 VMRegPair *regs, 445 BasicType ret_type ); 446 447 #ifdef HAVE_DTRACE_H 448 // Generate a dtrace 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_dtrace_nmethod(MacroAssembler* masm, 454 methodHandle method); 455 456 // dtrace support to convert a Java string to utf8 457 static void get_utf(oopDesc* src, address dst); 458 #endif // def HAVE_DTRACE_H 459 460 // A compiled caller has just called the interpreter, but compiled code 461 // exists. Patch the caller so he no longer calls into the interpreter. 462 static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc); 463 464 // Slow-path Locking and Unlocking 465 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 466 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock); 467 468 // Resolving of calls 469 static address resolve_static_call_C (JavaThread *thread); 470 static address resolve_virtual_call_C (JavaThread *thread); 471 static address resolve_opt_virtual_call_C(JavaThread *thread); 472 473 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 474 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 475 oopDesc* dest, jint dest_pos, 476 jint length, JavaThread* thread); 477 478 // handle ic miss with caller being compiled code 479 // wrong method handling (inline cache misses, zombie methods) 480 static address handle_wrong_method(JavaThread* thread); 481 static address handle_wrong_method_ic_miss(JavaThread* thread); 482 483 #ifndef PRODUCT 484 485 // Collect and print inline cache miss statistics 486 private: 487 enum { maxICmiss_count = 100 }; 488 static int _ICmiss_index; // length of IC miss histogram 489 static int _ICmiss_count[maxICmiss_count]; // miss counts 490 static address _ICmiss_at[maxICmiss_count]; // miss addresses 491 static void trace_ic_miss(address at); 492 493 public: 494 static int _monitor_enter_ctr; // monitor enter slow 495 static int _monitor_exit_ctr; // monitor exit slow 496 static int _throw_null_ctr; // throwing a null-pointer exception 497 static int _ic_miss_ctr; // total # of IC misses 498 static int _wrong_method_ctr; 499 static int _resolve_static_ctr; 500 static int _resolve_virtual_ctr; 501 static int _resolve_opt_virtual_ctr; 502 static int _implicit_null_throws; 503 static int _implicit_div0_throws; 504 505 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 506 static int _jshort_array_copy_ctr; // Slow-path short array copy 507 static int _jint_array_copy_ctr; // Slow-path int array copy 508 static int _jlong_array_copy_ctr; // Slow-path long array copy 509 static int _oop_array_copy_ctr; // Slow-path oop array copy 510 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 511 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 512 static int _generic_array_copy_ctr; // Slow-path includes type decoding 513 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 514 515 static int _new_instance_ctr; // 'new' object requires GC 516 static int _new_array_ctr; // 'new' array requires GC 517 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 518 static int _find_handler_ctr; // find exception handler 519 static int _rethrow_ctr; // rethrow exception 520 static int _mon_enter_stub_ctr; // monitor enter stub 521 static int _mon_exit_stub_ctr; // monitor exit stub 522 static int _mon_enter_ctr; // monitor enter slow 523 static int _mon_exit_ctr; // monitor exit slow 524 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 525 526 // Statistics code 527 // stats for "normal" compiled calls (non-interface) 528 static int _nof_normal_calls; // total # of calls 529 static int _nof_optimized_calls; // total # of statically-bound calls 530 static int _nof_inlined_calls; // total # of inlined normal calls 531 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 532 static int _nof_inlined_static_calls; // total # of inlined static calls 533 // stats for compiled interface calls 534 static int _nof_interface_calls; // total # of compiled calls 535 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 536 static int _nof_inlined_interface_calls; // total # of inlined interface calls 537 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 538 // stats for runtime exceptions 539 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 540 541 public: // for compiler 542 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 543 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 544 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 545 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 546 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 547 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 548 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 549 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 550 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 551 static void print_call_statistics(int comp_total); 552 static void print_statistics(); 553 static void print_ic_miss_histogram(); 554 555 #endif // PRODUCT 556 }; 557 558 559 // --------------------------------------------------------------------------- 560 // Implementation of AdapterHandlerLibrary 561 // 562 // This library manages argument marshaling adapters and native wrappers. 563 // There are 2 flavors of adapters: I2C and C2I. 564 // 565 // The I2C flavor takes a stock interpreted call setup, marshals the 566 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 567 // code_begin(). It is broken to call it without an nmethod assigned. 568 // The usual behavior is to lift any register arguments up out of the 569 // stack and possibly re-pack the extra arguments to be contigious. 570 // I2C adapters will save what the interpreter's stack pointer will be 571 // after arguments are popped, then adjust the interpreter's frame 572 // size to force alignment and possibly to repack the arguments. 573 // After re-packing, it jumps to the compiled code start. There are 574 // no safepoints in this adapter code and a GC cannot happen while 575 // marshaling is in progress. 576 // 577 // The C2I flavor takes a stock compiled call setup plus the target method in 578 // Rmethod, marshals the arguments for an interpreted call and jumps to 579 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 580 // setup. Compiled frames are fixed-size and the args are likely not in the 581 // right place. Hence all the args will likely be copied into the 582 // interpreter's frame, forcing that frame to grow. The compiled frame's 583 // outgoing stack args will be dead after the copy. 584 // 585 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 586 // also perform an offical frame push & pop. They have a call to the native 587 // routine in their middles and end in a return (instead of ending in a jump). 588 // The native wrappers are stored in real nmethods instead of the BufferBlobs 589 // used by the adapters. The code generation happens here because it's very 590 // similar to what the adapters have to do. 591 592 class AdapterHandlerEntry : public BasicHashtableEntry { 593 friend class AdapterHandlerTable; 594 595 private: 596 AdapterFingerPrint* _fingerprint; 597 address _i2c_entry; 598 address _c2i_entry; 599 address _c2i_unverified_entry; 600 601 #ifdef ASSERT 602 // Captures code and signature used to generate this adapter when 603 // verifing adapter equivalence. 604 unsigned char* _saved_code; 605 int _code_length; 606 BasicType* _saved_sig; 607 int _total_args_passed; 608 #endif 609 610 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 611 _fingerprint = fingerprint; 612 _i2c_entry = i2c_entry; 613 _c2i_entry = c2i_entry; 614 _c2i_unverified_entry = c2i_unverified_entry; 615 #ifdef ASSERT 616 _saved_code = NULL; 617 _code_length = 0; 618 _saved_sig = NULL; 619 _total_args_passed = 0; 620 #endif 621 } 622 623 void deallocate(); 624 625 // should never be used 626 AdapterHandlerEntry(); 627 628 public: 629 address get_i2c_entry() { return _i2c_entry; } 630 address get_c2i_entry() { return _c2i_entry; } 631 address get_c2i_unverified_entry() { return _c2i_unverified_entry; } 632 633 void relocate(address new_base); 634 635 AdapterFingerPrint* fingerprint() { return _fingerprint; } 636 637 AdapterHandlerEntry* next() { 638 return (AdapterHandlerEntry*)BasicHashtableEntry::next(); 639 } 640 641 #ifdef ASSERT 642 // Used to verify that code generated for shared adapters is equivalent 643 void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt); 644 bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt); 645 #endif 646 647 void print(); 648 }; 649 650 class AdapterHandlerLibrary: public AllStatic { 651 private: 652 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 653 static AdapterHandlerTable* _adapters; 654 static AdapterHandlerEntry* _abstract_method_handler; 655 static BufferBlob* buffer_blob(); 656 static void initialize(); 657 658 public: 659 660 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 661 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 662 static nmethod* create_native_wrapper(methodHandle method); 663 static AdapterHandlerEntry* get_adapter(methodHandle method); 664 665 #ifdef HAVE_DTRACE_H 666 static nmethod* create_dtrace_nmethod (methodHandle method); 667 #endif // HAVE_DTRACE_H 668 669 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); } 670 static void print_handler_on(outputStream* st, CodeBlob* b); 671 static bool contains(CodeBlob* b); 672 #ifndef PRODUCT 673 static void print_statistics(); 674 #endif /* PRODUCT */ 675 676 }; 677 678 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP