sharedRuntime.hpp revision 9801:80f8be586fae
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 26#define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 27 28#include "interpreter/bytecodeHistogram.hpp" 29#include "interpreter/bytecodeTracer.hpp" 30#include "interpreter/linkResolver.hpp" 31#include "memory/allocation.hpp" 32#include "memory/resourceArea.hpp" 33#include "utilities/hashtable.hpp" 34#include "utilities/macros.hpp" 35 36class AdapterHandlerEntry; 37class AdapterHandlerTable; 38class AdapterFingerPrint; 39class 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 47class SharedRuntime: AllStatic { 48 friend class VMStructs; 49 50 private: 51 static methodHandle resolve_sub_helper(JavaThread *thread, 52 bool is_virtual, 53 bool is_optimized, TRAPS); 54 55 // Shared stub locations 56 57 static RuntimeStub* _wrong_method_blob; 58 static RuntimeStub* _wrong_method_abstract_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); 102 103 104#ifdef _WIN64 105 // Workaround for fmod issue in the Windows x64 CRT 106 static double fmod_winx64(double x, double y); 107#endif 108 109#ifdef __SOFTFP__ 110 static jfloat fadd(jfloat x, jfloat y); 111 static jfloat fsub(jfloat x, jfloat y); 112 static jfloat fmul(jfloat x, jfloat y); 113 static jfloat fdiv(jfloat x, jfloat y); 114 115 static jdouble dadd(jdouble x, jdouble y); 116 static jdouble dsub(jdouble x, jdouble y); 117 static jdouble dmul(jdouble x, jdouble y); 118 static jdouble ddiv(jdouble x, jdouble y); 119#endif // __SOFTFP__ 120 121 // float conversion (needs to set appropriate rounding mode) 122 static jint f2i (jfloat x); 123 static jlong f2l (jfloat x); 124 static jint d2i (jdouble x); 125 static jlong d2l (jdouble x); 126 static jfloat d2f (jdouble x); 127 static jfloat l2f (jlong x); 128 static jdouble l2d (jlong x); 129 130#ifdef __SOFTFP__ 131 static jfloat i2f (jint x); 132 static jdouble i2d (jint x); 133 static jdouble f2d (jfloat x); 134#endif // __SOFTFP__ 135 136 // double trigonometrics and transcendentals 137 static jdouble dsin(jdouble x); 138 static jdouble dcos(jdouble x); 139 static jdouble dtan(jdouble x); 140 static jdouble dlog(jdouble x); 141 static jdouble dlog10(jdouble x); 142 static jdouble dexp(jdouble x); 143 static jdouble dpow(jdouble x, jdouble y); 144 145#if defined(__SOFTFP__) || defined(E500V2) 146 static double dabs(double f); 147#endif 148 149#if defined(__SOFTFP__) || defined(PPC) 150 static double dsqrt(double f); 151#endif 152 153 // Montgomery multiplication 154 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 155 jint len, jlong inv, jint *m_ints); 156 static void montgomery_square(jint *a_ints, jint *n_ints, 157 jint len, jlong inv, jint *m_ints); 158 159#ifdef __SOFTFP__ 160 // C++ compiler generates soft float instructions as well as passing 161 // float and double in registers. 162 static int fcmpl(float x, float y); 163 static int fcmpg(float x, float y); 164 static int dcmpl(double x, double y); 165 static int dcmpg(double x, double y); 166 167 static int unordered_fcmplt(float x, float y); 168 static int unordered_dcmplt(double x, double y); 169 static int unordered_fcmple(float x, float y); 170 static int unordered_dcmple(double x, double y); 171 static int unordered_fcmpge(float x, float y); 172 static int unordered_dcmpge(double x, double y); 173 static int unordered_fcmpgt(float x, float y); 174 static int unordered_dcmpgt(double x, double y); 175 176 static float fneg(float f); 177 static double dneg(double f); 178#endif 179 180 // exception handling across interpreter/compiler boundaries 181 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 182 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 183 184#if INCLUDE_ALL_GCS 185 // G1 write barriers 186 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 187 static void g1_wb_post(void* card_addr, JavaThread* thread); 188#endif // INCLUDE_ALL_GCS 189 190 // exception handling and implicit exceptions 191 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 192 bool force_unwind, bool top_frame_only); 193 enum ImplicitExceptionKind { 194 IMPLICIT_NULL, 195 IMPLICIT_DIVIDE_BY_ZERO, 196 STACK_OVERFLOW 197 }; 198 static void throw_AbstractMethodError(JavaThread* thread); 199 static void throw_IncompatibleClassChangeError(JavaThread* thread); 200 static void throw_ArithmeticException(JavaThread* thread); 201 static void throw_NullPointerException(JavaThread* thread); 202 static void throw_NullPointerException_at_call(JavaThread* thread); 203 static void throw_StackOverflowError(JavaThread* thread); 204 static void throw_delayed_StackOverflowError(JavaThread* thread); 205 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed); 206 static address continuation_for_implicit_exception(JavaThread* thread, 207 address faulting_pc, 208 ImplicitExceptionKind exception_kind); 209#if INCLUDE_JVMCI 210 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, nmethod* nm, int deopt_reason); 211#endif 212 213 static void enable_stack_reserved_zone(JavaThread* thread); 214 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr); 215 216 // Shared stub locations 217 static address get_poll_stub(address pc); 218 219 static address get_ic_miss_stub() { 220 assert(_ic_miss_blob!= NULL, "oops"); 221 return _ic_miss_blob->entry_point(); 222 } 223 224 static address get_handle_wrong_method_stub() { 225 assert(_wrong_method_blob!= NULL, "oops"); 226 return _wrong_method_blob->entry_point(); 227 } 228 229 static address get_handle_wrong_method_abstract_stub() { 230 assert(_wrong_method_abstract_blob!= NULL, "oops"); 231 return _wrong_method_abstract_blob->entry_point(); 232 } 233 234#ifdef COMPILER2 235 static void generate_uncommon_trap_blob(void); 236 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 237#endif // COMPILER2 238 239 static address get_resolve_opt_virtual_call_stub() { 240 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 241 return _resolve_opt_virtual_call_blob->entry_point(); 242 } 243 static address get_resolve_virtual_call_stub() { 244 assert(_resolve_virtual_call_blob != NULL, "oops"); 245 return _resolve_virtual_call_blob->entry_point(); 246 } 247 static address get_resolve_static_call_stub() { 248 assert(_resolve_static_call_blob != NULL, "oops"); 249 return _resolve_static_call_blob->entry_point(); 250 } 251 252 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 253 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 254 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 255 256 // Counters 257#ifndef PRODUCT 258 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 259#endif // PRODUCT 260 261 // Helper routine for full-speed JVMTI exception throwing support 262 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 263 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 264 265 // RedefineClasses() tracing support for obsolete method entry 266 static int rc_trace_method_entry(JavaThread* thread, Method* m); 267 268 // To be used as the entry point for unresolved native methods. 269 static address native_method_throw_unsatisfied_link_error_entry(); 270 static address native_method_throw_unsupported_operation_exception_entry(); 271 272 // bytecode tracing is only used by the TraceBytecodes 273 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 274 275 static oop retrieve_receiver(Symbol* sig, frame caller); 276 277 static void register_finalizer(JavaThread* thread, oopDesc* obj); 278 279 // dtrace notifications 280 static int dtrace_object_alloc(oopDesc* o, int size); 281 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size); 282 static int dtrace_method_entry(JavaThread* thread, Method* m); 283 static int dtrace_method_exit(JavaThread* thread, Method* m); 284 285 // Utility method for retrieving the Java thread id, returns 0 if the 286 // thread is not a well formed Java thread. 287 static jlong get_java_tid(Thread* thread); 288 289 290 // used by native wrappers to reenable yellow if overflow happened in native code 291 static void reguard_yellow_pages(); 292 293 // Fill in the "X cannot be cast to a Y" message for ClassCastException 294 // 295 // @param thr the current thread 296 // @param name the name of the class of the object attempted to be cast 297 // @return the dynamically allocated exception message (must be freed 298 // by the caller using a resource mark) 299 // 300 // BCP must refer to the current 'checkcast' opcode for the frame 301 // on top of the stack. 302 // The caller (or one of it's callers) must use a ResourceMark 303 // in order to correctly free the result. 304 // 305 static char* generate_class_cast_message(JavaThread* thr, const char* name); 306 307 // Fill in the "X cannot be cast to a Y" message for ClassCastException 308 // 309 // @param name the name of the class of the object attempted to be cast 310 // @param klass the name of the target klass attempt 311 // @param gripe the specific kind of problem being reported 312 // @return the dynamically allocated exception message (must be freed 313 // by the caller using a resource mark) 314 // 315 // This version does not require access the frame, so it can be called 316 // from interpreted code 317 // The caller (or one of it's callers) must use a ResourceMark 318 // in order to correctly free the result. 319 // 320 static char* generate_class_cast_message(const char* name, const char* klass, 321 const char* gripe = " cannot be cast to "); 322 323 // Resolves a call site- may patch in the destination of the call into the 324 // compiled code. 325 static methodHandle resolve_helper(JavaThread *thread, 326 bool is_virtual, 327 bool is_optimized, TRAPS); 328 329 private: 330 // deopt blob 331 static void generate_deopt_blob(void); 332 333 public: 334 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 335 336 // Resets a call-site in compiled code so it will get resolved again. 337 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 338 339 // In the code prolog, if the klass comparison fails, the inline cache 340 // misses and the call site is patched to megamorphic 341 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 342 343 // Find the method that called us. 344 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 345 346 347 private: 348 static Handle find_callee_info(JavaThread* thread, 349 Bytecodes::Code& bc, 350 CallInfo& callinfo, TRAPS); 351 static Handle find_callee_info_helper(JavaThread* thread, 352 vframeStream& vfst, 353 Bytecodes::Code& bc, 354 CallInfo& callinfo, TRAPS); 355 356 static methodHandle extract_attached_method(vframeStream& vfst); 357 358 static address clean_virtual_call_entry(); 359 static address clean_opt_virtual_call_entry(); 360 static address clean_static_call_entry(); 361 362 public: 363 364 // Read the array of BasicTypes from a Java signature, and compute where 365 // compiled Java code would like to put the results. Values in reg_lo and 366 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 367 // registers, those above refer to 4-byte stack slots. All stack slots are 368 // based off of the window top. SharedInfo::stack0 refers to the first usable 369 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 370 // 4-bytes higher. So for sparc because the register window save area is at 371 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 372 // will be just above it. ( 373 // return value is the maximum number of VMReg stack slots the convention will use. 374 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing); 375 376 static void check_member_name_argument_is_last_argument(const methodHandle& method, 377 const BasicType* sig_bt, 378 const VMRegPair* regs) NOT_DEBUG_RETURN; 379 380 // Ditto except for calling C 381 // 382 // C argument in register AND stack slot. 383 // Some architectures require that an argument must be passed in a register 384 // AND in a stack slot. These architectures provide a second VMRegPair array 385 // to be filled by the c_calling_convention method. On other architectures, 386 // NULL is being passed as the second VMRegPair array, so arguments are either 387 // passed in a register OR in a stack slot. 388 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2, 389 int total_args_passed); 390 391 // Compute the new number of arguments in the signature if 32 bit ints 392 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs 393 // is true. 394 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt); 395 // Adapt a method's signature if it contains 32 bit integers that must 396 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs 397 // is true. 398 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count, 399 BasicType*& in_sig_bt, VMRegPair*& in_regs); 400 401 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 402 // blobs. Unlike adapters in the tiger and earlier releases the code in these 403 // blobs does not create a new frame and are therefore virtually invisible 404 // to the stack walking code. In general these blobs extend the callers stack 405 // as needed for the conversion of argument locations. 406 407 // When calling a c2i blob the code will always call the interpreter even if 408 // by the time we reach the blob there is compiled code available. This allows 409 // the blob to pass the incoming stack pointer (the sender sp) in a known 410 // location for the interpreter to record. This is used by the frame code 411 // to correct the sender code to match up with the stack pointer when the 412 // thread left the compiled code. In addition it allows the interpreter 413 // to remove the space the c2i adapter allocated to do its argument conversion. 414 415 // Although a c2i blob will always run interpreted even if compiled code is 416 // present if we see that compiled code is present the compiled call site 417 // will be patched/re-resolved so that later calls will run compiled. 418 419 // Additionally a c2i blob need to have a unverified entry because it can be reached 420 // in situations where the call site is an inlined cache site and may go megamorphic. 421 422 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 423 // that the interpreter before it does any call dispatch will record the current 424 // stack pointer in the interpreter frame. On return it will restore the stack 425 // pointer as needed. This means the i2c adapter code doesn't need any special 426 // handshaking path with compiled code to keep the stack walking correct. 427 428 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 429 int total_args_passed, 430 int max_arg, 431 const BasicType *sig_bt, 432 const VMRegPair *regs, 433 AdapterFingerPrint* fingerprint); 434 435 static void gen_i2c_adapter(MacroAssembler *_masm, 436 int total_args_passed, 437 int comp_args_on_stack, 438 const BasicType *sig_bt, 439 const VMRegPair *regs); 440 441 // OSR support 442 443 // OSR_migration_begin will extract the jvm state from an interpreter 444 // frame (locals, monitors) and store the data in a piece of C heap 445 // storage. This then allows the interpreter frame to be removed from the 446 // stack and the OSR nmethod to be called. That method is called with a 447 // pointer to the C heap storage. This pointer is the return value from 448 // OSR_migration_begin. 449 450 static intptr_t* OSR_migration_begin(JavaThread *thread); 451 452 // OSR_migration_end is a trivial routine. It is called after the compiled 453 // method has extracted the jvm state from the C heap that OSR_migration_begin 454 // created. It's entire job is to simply free this storage. 455 static void OSR_migration_end(intptr_t* buf); 456 457 // Convert a sig into a calling convention register layout 458 // and find interesting things about it. 459 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 460 static VMReg name_for_receiver(); 461 462 // "Top of Stack" slots that may be unused by the calling convention but must 463 // otherwise be preserved. 464 // On Intel these are not necessary and the value can be zero. 465 // On Sparc this describes the words reserved for storing a register window 466 // when an interrupt occurs. 467 static uint out_preserve_stack_slots(); 468 469 // Is vector's size (in bytes) bigger than a size saved by default? 470 // For example, on x86 16 bytes XMM registers are saved by default. 471 static bool is_wide_vector(int size); 472 473 // Save and restore a native result 474 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 475 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 476 477 // Generate a native wrapper for a given method. The method takes arguments 478 // in the Java compiled code convention, marshals them to the native 479 // convention (handlizes oops, etc), transitions to native, makes the call, 480 // returns to java state (possibly blocking), unhandlizes any result and 481 // returns. 482 // 483 // The wrapper may contain special-case code if the given method 484 // is a JNI critical method, or a compiled method handle adapter, 485 // such as _invokeBasic, _linkToVirtual, etc. 486 static nmethod* generate_native_wrapper(MacroAssembler* masm, 487 const methodHandle& method, 488 int compile_id, 489 BasicType* sig_bt, 490 VMRegPair* regs, 491 BasicType ret_type); 492 493 // Block before entering a JNI critical method 494 static void block_for_jni_critical(JavaThread* thread); 495 496 // A compiled caller has just called the interpreter, but compiled code 497 // exists. Patch the caller so he no longer calls into the interpreter. 498 static void fixup_callers_callsite(Method* moop, address ret_pc); 499 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 500 501 // Slow-path Locking and Unlocking 502 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 503 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 504 505 // Resolving of calls 506 static address resolve_static_call_C (JavaThread *thread); 507 static address resolve_virtual_call_C (JavaThread *thread); 508 static address resolve_opt_virtual_call_C(JavaThread *thread); 509 510 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 511 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 512 oopDesc* dest, jint dest_pos, 513 jint length, JavaThread* thread); 514 515 // handle ic miss with caller being compiled code 516 // wrong method handling (inline cache misses, zombie methods) 517 static address handle_wrong_method(JavaThread* thread); 518 static address handle_wrong_method_abstract(JavaThread* thread); 519 static address handle_wrong_method_ic_miss(JavaThread* thread); 520 521#ifndef PRODUCT 522 523 // Collect and print inline cache miss statistics 524 private: 525 enum { maxICmiss_count = 100 }; 526 static int _ICmiss_index; // length of IC miss histogram 527 static int _ICmiss_count[maxICmiss_count]; // miss counts 528 static address _ICmiss_at[maxICmiss_count]; // miss addresses 529 static void trace_ic_miss(address at); 530 531 public: 532 static int _throw_null_ctr; // throwing a null-pointer exception 533 static int _ic_miss_ctr; // total # of IC misses 534 static int _wrong_method_ctr; 535 static int _resolve_static_ctr; 536 static int _resolve_virtual_ctr; 537 static int _resolve_opt_virtual_ctr; 538 static int _implicit_null_throws; 539 static int _implicit_div0_throws; 540 541 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 542 static int _jshort_array_copy_ctr; // Slow-path short array copy 543 static int _jint_array_copy_ctr; // Slow-path int array copy 544 static int _jlong_array_copy_ctr; // Slow-path long array copy 545 static int _oop_array_copy_ctr; // Slow-path oop array copy 546 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 547 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 548 static int _generic_array_copy_ctr; // Slow-path includes type decoding 549 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 550 551 static int _new_instance_ctr; // 'new' object requires GC 552 static int _new_array_ctr; // 'new' array requires GC 553 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 554 static int _find_handler_ctr; // find exception handler 555 static int _rethrow_ctr; // rethrow exception 556 static int _mon_enter_stub_ctr; // monitor enter stub 557 static int _mon_exit_stub_ctr; // monitor exit stub 558 static int _mon_enter_ctr; // monitor enter slow 559 static int _mon_exit_ctr; // monitor exit slow 560 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 561 562 // Statistics code 563 // stats for "normal" compiled calls (non-interface) 564 static int _nof_normal_calls; // total # of calls 565 static int _nof_optimized_calls; // total # of statically-bound calls 566 static int _nof_inlined_calls; // total # of inlined normal calls 567 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 568 static int _nof_inlined_static_calls; // total # of inlined static calls 569 // stats for compiled interface calls 570 static int _nof_interface_calls; // total # of compiled calls 571 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 572 static int _nof_inlined_interface_calls; // total # of inlined interface calls 573 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 574 // stats for runtime exceptions 575 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 576 577 public: // for compiler 578 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 579 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 580 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 581 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 582 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 583 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 584 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 585 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 586 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 587 static void print_call_statistics(int comp_total); 588 static void print_statistics(); 589 static void print_ic_miss_histogram(); 590 591#endif // PRODUCT 592}; 593 594 595// --------------------------------------------------------------------------- 596// Implementation of AdapterHandlerLibrary 597// 598// This library manages argument marshaling adapters and native wrappers. 599// There are 2 flavors of adapters: I2C and C2I. 600// 601// The I2C flavor takes a stock interpreted call setup, marshals the 602// arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 603// code_begin(). It is broken to call it without an nmethod assigned. 604// The usual behavior is to lift any register arguments up out of the 605// stack and possibly re-pack the extra arguments to be contiguous. 606// I2C adapters will save what the interpreter's stack pointer will be 607// after arguments are popped, then adjust the interpreter's frame 608// size to force alignment and possibly to repack the arguments. 609// After re-packing, it jumps to the compiled code start. There are 610// no safepoints in this adapter code and a GC cannot happen while 611// marshaling is in progress. 612// 613// The C2I flavor takes a stock compiled call setup plus the target method in 614// Rmethod, marshals the arguments for an interpreted call and jumps to 615// Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 616// setup. Compiled frames are fixed-size and the args are likely not in the 617// right place. Hence all the args will likely be copied into the 618// interpreter's frame, forcing that frame to grow. The compiled frame's 619// outgoing stack args will be dead after the copy. 620// 621// Native wrappers, like adapters, marshal arguments. Unlike adapters they 622// also perform an official frame push & pop. They have a call to the native 623// routine in their middles and end in a return (instead of ending in a jump). 624// The native wrappers are stored in real nmethods instead of the BufferBlobs 625// used by the adapters. The code generation happens here because it's very 626// similar to what the adapters have to do. 627 628class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 629 friend class AdapterHandlerTable; 630 631 private: 632 AdapterFingerPrint* _fingerprint; 633 address _i2c_entry; 634 address _c2i_entry; 635 address _c2i_unverified_entry; 636 637#ifdef ASSERT 638 // Captures code and signature used to generate this adapter when 639 // verifying adapter equivalence. 640 unsigned char* _saved_code; 641 int _saved_code_length; 642#endif 643 644 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 645 _fingerprint = fingerprint; 646 _i2c_entry = i2c_entry; 647 _c2i_entry = c2i_entry; 648 _c2i_unverified_entry = c2i_unverified_entry; 649#ifdef ASSERT 650 _saved_code = NULL; 651 _saved_code_length = 0; 652#endif 653 } 654 655 void deallocate(); 656 657 // should never be used 658 AdapterHandlerEntry(); 659 660 public: 661 address get_i2c_entry() const { return _i2c_entry; } 662 address get_c2i_entry() const { return _c2i_entry; } 663 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 664 address base_address(); 665 void relocate(address new_base); 666 667 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 668 669 AdapterHandlerEntry* next() { 670 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 671 } 672 673#ifdef ASSERT 674 // Used to verify that code generated for shared adapters is equivalent 675 void save_code (unsigned char* code, int length); 676 bool compare_code(unsigned char* code, int length); 677#endif 678 679 //virtual void print_on(outputStream* st) const; DO NOT USE 680 void print_adapter_on(outputStream* st) const; 681}; 682 683class AdapterHandlerLibrary: public AllStatic { 684 private: 685 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 686 static AdapterHandlerTable* _adapters; 687 static AdapterHandlerEntry* _abstract_method_handler; 688 static BufferBlob* buffer_blob(); 689 static void initialize(); 690 691 public: 692 693 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 694 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 695 static void create_native_wrapper(const methodHandle& method); 696 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 697 698 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 699 static void print_handler_on(outputStream* st, const CodeBlob* b); 700 static bool contains(const CodeBlob* b); 701#ifndef PRODUCT 702 static void print_statistics(); 703#endif // PRODUCT 704 705}; 706 707#endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 708