1 /* 2 * Copyright (c) 1997, 2012, 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* _ic_miss_blob; 60 static RuntimeStub* _resolve_opt_virtual_call_blob; 61 static RuntimeStub* _resolve_virtual_call_blob; 62 static RuntimeStub* _resolve_static_call_blob; 63 64 static DeoptimizationBlob* _deopt_blob; 65 66 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob; 67 static SafepointBlob* _polling_page_safepoint_handler_blob; 68 static SafepointBlob* _polling_page_return_handler_blob; 69 70 #ifdef COMPILER2 71 static UncommonTrapBlob* _uncommon_trap_blob; 72 #endif // COMPILER2 73 74 #ifndef PRODUCT 75 // Counters 76 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 77 #endif // !PRODUCT 78 79 private: 80 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP }; 81 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type); 82 static RuntimeStub* generate_resolve_blob(address destination, const char* name); 83 84 public: 85 static void generate_stubs(void); 86 87 // max bytes for each dtrace string parameter 88 enum { max_dtrace_string_size = 256 }; 89 90 // The following arithmetic routines are used on platforms that do 91 // not have machine instructions to implement their functionality. 92 // Do not remove these. 93 94 // long arithmetics 95 static jlong lmul(jlong y, jlong x); 96 static jlong ldiv(jlong y, jlong x); 97 static jlong lrem(jlong y, jlong x); 98 99 // float and double remainder 100 static jfloat frem(jfloat x, jfloat y); 101 static jdouble drem(jdouble x, jdouble y); 102 103 #ifdef __SOFTFP__ 104 static jfloat fadd(jfloat x, jfloat y); 105 static jfloat fsub(jfloat x, jfloat y); 106 static jfloat fmul(jfloat x, jfloat y); 107 static jfloat fdiv(jfloat x, jfloat y); 108 109 static jdouble dadd(jdouble x, jdouble y); 110 static jdouble dsub(jdouble x, jdouble y); 111 static jdouble dmul(jdouble x, jdouble y); 112 static jdouble ddiv(jdouble x, jdouble y); 113 #endif // __SOFTFP__ 114 115 // float conversion (needs to set appropriate rounding mode) 116 static jint f2i (jfloat x); 117 static jlong f2l (jfloat x); 118 static jint d2i (jdouble x); 119 static jlong d2l (jdouble x); 120 static jfloat d2f (jdouble x); 121 static jfloat l2f (jlong x); 122 static jdouble l2d (jlong x); 123 124 #ifdef __SOFTFP__ 125 static jfloat i2f (jint x); 126 static jdouble i2d (jint x); 127 static jdouble f2d (jfloat x); 128 #endif // __SOFTFP__ 129 130 // double trigonometrics and transcendentals 131 static jdouble dsin(jdouble x); 132 static jdouble dcos(jdouble x); 133 static jdouble dtan(jdouble x); 134 static jdouble dlog(jdouble x); 135 static jdouble dlog10(jdouble x); 136 static jdouble dexp(jdouble x); 137 static jdouble dpow(jdouble x, jdouble y); 138 139 #if defined(__SOFTFP__) || defined(E500V2) 140 static double dabs(double f); 141 #endif 142 143 #if defined(__SOFTFP__) || defined(PPC) 144 static double dsqrt(double f); 145 #endif 146 147 #ifdef __SOFTFP__ 148 // C++ compiler generates soft float instructions as well as passing 149 // float and double in registers. 150 static int fcmpl(float x, float y); 151 static int fcmpg(float x, float y); 152 static int dcmpl(double x, double y); 153 static int dcmpg(double x, double y); 154 155 static int unordered_fcmplt(float x, float y); 156 static int unordered_dcmplt(double x, double y); 157 static int unordered_fcmple(float x, float y); 158 static int unordered_dcmple(double x, double y); 159 static int unordered_fcmpge(float x, float y); 160 static int unordered_dcmpge(double x, double y); 161 static int unordered_fcmpgt(float x, float y); 162 static int unordered_dcmpgt(double x, double y); 163 164 static float fneg(float f); 165 static double dneg(double f); 166 #endif 167 168 // exception handling across interpreter/compiler boundaries 169 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 170 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 171 172 #if INCLUDE_ALL_GCS 173 // G1 write barriers 174 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 175 static void g1_wb_post(void* card_addr, JavaThread* thread); 176 #endif // INCLUDE_ALL_GCS 177 178 // exception handling and implicit exceptions 179 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 180 bool force_unwind, bool top_frame_only); 181 enum ImplicitExceptionKind { 182 IMPLICIT_NULL, 183 IMPLICIT_DIVIDE_BY_ZERO, 184 STACK_OVERFLOW 185 }; 186 static void throw_AbstractMethodError(JavaThread* thread); 187 static void throw_IncompatibleClassChangeError(JavaThread* thread); 188 static void throw_ArithmeticException(JavaThread* thread); 189 static void throw_NullPointerException(JavaThread* thread); 190 static void throw_NullPointerException_at_call(JavaThread* thread); 191 static void throw_StackOverflowError(JavaThread* thread); 192 static address continuation_for_implicit_exception(JavaThread* thread, 193 address faulting_pc, 194 ImplicitExceptionKind exception_kind); 195 196 // Shared stub locations 197 static address get_poll_stub(address pc); 198 199 static address get_ic_miss_stub() { 200 assert(_ic_miss_blob!= NULL, "oops"); 201 return _ic_miss_blob->entry_point(); 202 } 203 204 static address get_handle_wrong_method_stub() { 205 assert(_wrong_method_blob!= NULL, "oops"); 206 return _wrong_method_blob->entry_point(); 207 } 208 209 #ifdef COMPILER2 210 static void generate_uncommon_trap_blob(void); 211 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 212 #endif // COMPILER2 213 214 static address get_resolve_opt_virtual_call_stub(){ 215 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 216 return _resolve_opt_virtual_call_blob->entry_point(); 217 } 218 static address get_resolve_virtual_call_stub() { 219 assert(_resolve_virtual_call_blob != NULL, "oops"); 220 return _resolve_virtual_call_blob->entry_point(); 221 } 222 static address get_resolve_static_call_stub() { 223 assert(_resolve_static_call_blob != NULL, "oops"); 224 return _resolve_static_call_blob->entry_point(); 225 } 226 227 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 228 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 229 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 230 231 // Counters 232 #ifndef PRODUCT 233 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 234 #endif // PRODUCT 235 236 // Helper routine for full-speed JVMTI exception throwing support 237 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 238 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 239 240 // RedefineClasses() tracing support for obsolete method entry 241 static int rc_trace_method_entry(JavaThread* thread, Method* m); 242 243 // To be used as the entry point for unresolved native methods. 244 static address native_method_throw_unsatisfied_link_error_entry(); 245 static address native_method_throw_unsupported_operation_exception_entry(); 246 247 // bytecode tracing is only used by the TraceBytecodes 248 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 249 250 // Used to back off a spin lock that is under heavy contention 251 static void yield_all(JavaThread* thread, int attempts = 0); 252 253 static oop retrieve_receiver( Symbol* sig, frame caller ); 254 255 static void register_finalizer(JavaThread* thread, oopDesc* obj); 256 257 // dtrace notifications 258 static int dtrace_object_alloc(oopDesc* o); 259 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o); 260 static int dtrace_method_entry(JavaThread* thread, Method* m); 261 static int dtrace_method_exit(JavaThread* thread, Method* m); 262 263 // Utility method for retrieving the Java thread id, returns 0 if the 264 // thread is not a well formed Java thread. 265 static jlong get_java_tid(Thread* thread); 266 267 268 // used by native wrappers to reenable yellow if overflow happened in native code 269 static void reguard_yellow_pages(); 270 271 /** 272 * Fill in the "X cannot be cast to a Y" message for ClassCastException 273 * 274 * @param thr the current thread 275 * @param name the name of the class of the object attempted to be cast 276 * @return the dynamically allocated exception message (must be freed 277 * by the caller using a resource mark) 278 * 279 * BCP must refer to the current 'checkcast' opcode for the frame 280 * on top of the stack. 281 * The caller (or one of it's callers) must use a ResourceMark 282 * in order to correctly free the result. 283 */ 284 static char* generate_class_cast_message(JavaThread* thr, const char* name); 285 286 /** 287 * Fill in the "X cannot be cast to a Y" message for ClassCastException 288 * 289 * @param name the name of the class of the object attempted to be cast 290 * @param klass the name of the target klass attempt 291 * @param gripe the specific kind of problem being reported 292 * @return the dynamically allocated exception message (must be freed 293 * by the caller using a resource mark) 294 * 295 * This version does not require access the frame, so it can be called 296 * from interpreted code 297 * The caller (or one of it's callers) must use a ResourceMark 298 * in order to correctly free the result. 299 */ 300 static char* generate_class_cast_message(const char* name, const char* klass, 301 const char* gripe = " cannot be cast to "); 302 303 // Resolves a call site- may patch in the destination of the call into the 304 // compiled code. 305 static methodHandle resolve_helper(JavaThread *thread, 306 bool is_virtual, 307 bool is_optimized, TRAPS); 308 309 private: 310 // deopt blob 311 static void generate_deopt_blob(void); 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 static void check_member_name_argument_is_last_argument(methodHandle method, 355 const BasicType* sig_bt, 356 const VMRegPair* regs) NOT_DEBUG_RETURN; 357 358 // Ditto except for calling C 359 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed); 360 361 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 362 // blobs. Unlike adapters in the tiger and earlier releases the code in these 363 // blobs does not create a new frame and are therefore virtually invisible 364 // to the stack walking code. In general these blobs extend the callers stack 365 // as needed for the conversion of argument locations. 366 367 // When calling a c2i blob the code will always call the interpreter even if 368 // by the time we reach the blob there is compiled code available. This allows 369 // the blob to pass the incoming stack pointer (the sender sp) in a known 370 // location for the interpreter to record. This is used by the frame code 371 // to correct the sender code to match up with the stack pointer when the 372 // thread left the compiled code. In addition it allows the interpreter 373 // to remove the space the c2i adapter allocated to do it argument conversion. 374 375 // Although a c2i blob will always run interpreted even if compiled code is 376 // present if we see that compiled code is present the compiled call site 377 // will be patched/re-resolved so that later calls will run compiled. 378 379 // Aditionally a c2i blob need to have a unverified entry because it can be reached 380 // in situations where the call site is an inlined cache site and may go megamorphic. 381 382 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 383 // that the interpreter before it does any call dispatch will record the current 384 // stack pointer in the interpreter frame. On return it will restore the stack 385 // pointer as needed. This means the i2c adapter code doesn't need any special 386 // handshaking path with compiled code to keep the stack walking correct. 387 388 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 389 int total_args_passed, 390 int max_arg, 391 const BasicType *sig_bt, 392 const VMRegPair *regs, 393 AdapterFingerPrint* fingerprint); 394 395 // OSR support 396 397 // OSR_migration_begin will extract the jvm state from an interpreter 398 // frame (locals, monitors) and store the data in a piece of C heap 399 // storage. This then allows the interpreter frame to be removed from the 400 // stack and the OSR nmethod to be called. That method is called with a 401 // pointer to the C heap storage. This pointer is the return value from 402 // OSR_migration_begin. 403 404 static intptr_t* OSR_migration_begin( JavaThread *thread); 405 406 // OSR_migration_end is a trivial routine. It is called after the compiled 407 // method has extracted the jvm state from the C heap that OSR_migration_begin 408 // created. It's entire job is to simply free this storage. 409 static void OSR_migration_end ( intptr_t* buf); 410 411 // Convert a sig into a calling convention register layout 412 // and find interesting things about it. 413 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 414 static VMReg name_for_receiver(); 415 416 // "Top of Stack" slots that may be unused by the calling convention but must 417 // otherwise be preserved. 418 // On Intel these are not necessary and the value can be zero. 419 // On Sparc this describes the words reserved for storing a register window 420 // when an interrupt occurs. 421 static uint out_preserve_stack_slots(); 422 423 // Is vector's size (in bytes) bigger than a size saved by default? 424 // For example, on x86 16 bytes XMM registers are saved by default. 425 static bool is_wide_vector(int size); 426 427 // Save and restore a native result 428 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 429 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 430 431 // Generate a native wrapper for a given method. The method takes arguments 432 // in the Java compiled code convention, marshals them to the native 433 // convention (handlizes oops, etc), transitions to native, makes the call, 434 // returns to java state (possibly blocking), unhandlizes any result and 435 // returns. 436 // 437 // The wrapper may contain special-case code if the given method 438 // is a JNI critical method, or a compiled method handle adapter, 439 // such as _invokeBasic, _linkToVirtual, etc. 440 static nmethod* generate_native_wrapper(MacroAssembler* masm, 441 methodHandle method, 442 int compile_id, 443 BasicType* sig_bt, 444 VMRegPair* regs, 445 BasicType ret_type ); 446 447 // Block before entering a JNI critical method 448 static void block_for_jni_critical(JavaThread* thread); 449 450 #ifdef HAVE_DTRACE_H 451 // Generate a dtrace wrapper for a given method. The method takes arguments 452 // in the Java compiled code convention, marshals them to the native 453 // convention (handlizes oops, etc), transitions to native, makes the call, 454 // returns to java state (possibly blocking), unhandlizes any result and 455 // returns. 456 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm, 457 methodHandle method); 458 459 // dtrace support to convert a Java string to utf8 460 static void get_utf(oopDesc* src, address dst); 461 #endif // def HAVE_DTRACE_H 462 463 // A compiled caller has just called the interpreter, but compiled code 464 // exists. Patch the caller so he no longer calls into the interpreter. 465 static void fixup_callers_callsite(Method* moop, address ret_pc); 466 467 // Slow-path Locking and Unlocking 468 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 469 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock); 470 471 // Resolving of calls 472 static address resolve_static_call_C (JavaThread *thread); 473 static address resolve_virtual_call_C (JavaThread *thread); 474 static address resolve_opt_virtual_call_C(JavaThread *thread); 475 476 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 477 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 478 oopDesc* dest, jint dest_pos, 479 jint length, JavaThread* thread); 480 481 // handle ic miss with caller being compiled code 482 // wrong method handling (inline cache misses, zombie methods) 483 static address handle_wrong_method(JavaThread* thread); 484 static address handle_wrong_method_ic_miss(JavaThread* thread); 485 486 #ifndef PRODUCT 487 488 // Collect and print inline cache miss statistics 489 private: 490 enum { maxICmiss_count = 100 }; 491 static int _ICmiss_index; // length of IC miss histogram 492 static int _ICmiss_count[maxICmiss_count]; // miss counts 493 static address _ICmiss_at[maxICmiss_count]; // miss addresses 494 static void trace_ic_miss(address at); 495 496 public: 497 static int _monitor_enter_ctr; // monitor enter slow 498 static int _monitor_exit_ctr; // monitor exit slow 499 static int _throw_null_ctr; // throwing a null-pointer exception 500 static int _ic_miss_ctr; // total # of IC misses 501 static int _wrong_method_ctr; 502 static int _resolve_static_ctr; 503 static int _resolve_virtual_ctr; 504 static int _resolve_opt_virtual_ctr; 505 static int _implicit_null_throws; 506 static int _implicit_div0_throws; 507 508 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 509 static int _jshort_array_copy_ctr; // Slow-path short array copy 510 static int _jint_array_copy_ctr; // Slow-path int array copy 511 static int _jlong_array_copy_ctr; // Slow-path long array copy 512 static int _oop_array_copy_ctr; // Slow-path oop array copy 513 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 514 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 515 static int _generic_array_copy_ctr; // Slow-path includes type decoding 516 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 517 518 static int _new_instance_ctr; // 'new' object requires GC 519 static int _new_array_ctr; // 'new' array requires GC 520 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 521 static int _find_handler_ctr; // find exception handler 522 static int _rethrow_ctr; // rethrow exception 523 static int _mon_enter_stub_ctr; // monitor enter stub 524 static int _mon_exit_stub_ctr; // monitor exit stub 525 static int _mon_enter_ctr; // monitor enter slow 526 static int _mon_exit_ctr; // monitor exit slow 527 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 528 529 // Statistics code 530 // stats for "normal" compiled calls (non-interface) 531 static int _nof_normal_calls; // total # of calls 532 static int _nof_optimized_calls; // total # of statically-bound calls 533 static int _nof_inlined_calls; // total # of inlined normal calls 534 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 535 static int _nof_inlined_static_calls; // total # of inlined static calls 536 // stats for compiled interface calls 537 static int _nof_interface_calls; // total # of compiled calls 538 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 539 static int _nof_inlined_interface_calls; // total # of inlined interface calls 540 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 541 // stats for runtime exceptions 542 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 543 544 public: // for compiler 545 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 546 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 547 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 548 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 549 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 550 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 551 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 552 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 553 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 554 static void print_call_statistics(int comp_total); 555 static void print_statistics(); 556 static void print_ic_miss_histogram(); 557 558 #endif // PRODUCT 559 }; 560 561 562 // --------------------------------------------------------------------------- 563 // Implementation of AdapterHandlerLibrary 564 // 565 // This library manages argument marshaling adapters and native wrappers. 566 // There are 2 flavors of adapters: I2C and C2I. 567 // 568 // The I2C flavor takes a stock interpreted call setup, marshals the 569 // arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 570 // code_begin(). It is broken to call it without an nmethod assigned. 571 // The usual behavior is to lift any register arguments up out of the 572 // stack and possibly re-pack the extra arguments to be contigious. 573 // I2C adapters will save what the interpreter's stack pointer will be 574 // after arguments are popped, then adjust the interpreter's frame 575 // size to force alignment and possibly to repack the arguments. 576 // After re-packing, it jumps to the compiled code start. There are 577 // no safepoints in this adapter code and a GC cannot happen while 578 // marshaling is in progress. 579 // 580 // The C2I flavor takes a stock compiled call setup plus the target method in 581 // Rmethod, marshals the arguments for an interpreted call and jumps to 582 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 583 // setup. Compiled frames are fixed-size and the args are likely not in the 584 // right place. Hence all the args will likely be copied into the 585 // interpreter's frame, forcing that frame to grow. The compiled frame's 586 // outgoing stack args will be dead after the copy. 587 // 588 // Native wrappers, like adapters, marshal arguments. Unlike adapters they 589 // also perform an offical frame push & pop. They have a call to the native 590 // routine in their middles and end in a return (instead of ending in a jump). 591 // The native wrappers are stored in real nmethods instead of the BufferBlobs 592 // used by the adapters. The code generation happens here because it's very 593 // similar to what the adapters have to do. 594 595 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 596 friend class AdapterHandlerTable; 597 598 private: 599 AdapterFingerPrint* _fingerprint; 600 address _i2c_entry; 601 address _c2i_entry; 602 address _c2i_unverified_entry; 603 604 #ifdef ASSERT 605 // Captures code and signature used to generate this adapter when 606 // verifing adapter equivalence. 607 unsigned char* _saved_code; 608 int _saved_code_length; 609 #endif 610 611 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 612 _fingerprint = fingerprint; 613 _i2c_entry = i2c_entry; 614 _c2i_entry = c2i_entry; 615 _c2i_unverified_entry = c2i_unverified_entry; 616 #ifdef ASSERT 617 _saved_code = NULL; 618 _saved_code_length = 0; 619 #endif 620 } 621 622 void deallocate(); 623 624 // should never be used 625 AdapterHandlerEntry(); 626 627 public: 628 address get_i2c_entry() const { return _i2c_entry; } 629 address get_c2i_entry() const { return _c2i_entry; } 630 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 631 address base_address(); 632 void relocate(address new_base); 633 634 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 635 636 AdapterHandlerEntry* next() { 637 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 638 } 639 640 #ifdef ASSERT 641 // Used to verify that code generated for shared adapters is equivalent 642 void save_code (unsigned char* code, int length); 643 bool compare_code(unsigned char* code, int length); 644 #endif 645 646 //virtual void print_on(outputStream* st) const; DO NOT USE 647 void print_adapter_on(outputStream* st) const; 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, int compile_id); 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