sharedRuntime.hpp revision 9721:9e1dc7ba8db3
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 address continuation_for_implicit_exception(JavaThread* thread, 205 address faulting_pc, 206 ImplicitExceptionKind exception_kind); 207#if INCLUDE_JVMCI 208 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, nmethod* nm, int deopt_reason); 209#endif 210 211 // Shared stub locations 212 static address get_poll_stub(address pc); 213 214 static address get_ic_miss_stub() { 215 assert(_ic_miss_blob!= NULL, "oops"); 216 return _ic_miss_blob->entry_point(); 217 } 218 219 static address get_handle_wrong_method_stub() { 220 assert(_wrong_method_blob!= NULL, "oops"); 221 return _wrong_method_blob->entry_point(); 222 } 223 224 static address get_handle_wrong_method_abstract_stub() { 225 assert(_wrong_method_abstract_blob!= NULL, "oops"); 226 return _wrong_method_abstract_blob->entry_point(); 227 } 228 229#ifdef COMPILER2 230 static void generate_uncommon_trap_blob(void); 231 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 232#endif // COMPILER2 233 234 static address get_resolve_opt_virtual_call_stub() { 235 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 236 return _resolve_opt_virtual_call_blob->entry_point(); 237 } 238 static address get_resolve_virtual_call_stub() { 239 assert(_resolve_virtual_call_blob != NULL, "oops"); 240 return _resolve_virtual_call_blob->entry_point(); 241 } 242 static address get_resolve_static_call_stub() { 243 assert(_resolve_static_call_blob != NULL, "oops"); 244 return _resolve_static_call_blob->entry_point(); 245 } 246 247 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 248 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 249 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; } 250 251 // Counters 252#ifndef PRODUCT 253 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 254#endif // PRODUCT 255 256 // Helper routine for full-speed JVMTI exception throwing support 257 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 258 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 259 260 // RedefineClasses() tracing support for obsolete method entry 261 static int rc_trace_method_entry(JavaThread* thread, Method* m); 262 263 // To be used as the entry point for unresolved native methods. 264 static address native_method_throw_unsatisfied_link_error_entry(); 265 static address native_method_throw_unsupported_operation_exception_entry(); 266 267 // bytecode tracing is only used by the TraceBytecodes 268 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 269 270 static oop retrieve_receiver(Symbol* sig, frame caller); 271 272 static void register_finalizer(JavaThread* thread, oopDesc* obj); 273 274 // dtrace notifications 275 static int dtrace_object_alloc(oopDesc* o, int size); 276 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size); 277 static int dtrace_method_entry(JavaThread* thread, Method* m); 278 static int dtrace_method_exit(JavaThread* thread, Method* m); 279 280 // Utility method for retrieving the Java thread id, returns 0 if the 281 // thread is not a well formed Java thread. 282 static jlong get_java_tid(Thread* thread); 283 284 285 // used by native wrappers to reenable yellow if overflow happened in native code 286 static void reguard_yellow_pages(); 287 288 // Fill in the "X cannot be cast to a Y" message for ClassCastException 289 // 290 // @param thr the current thread 291 // @param name the name of the class of the object attempted to be cast 292 // @return the dynamically allocated exception message (must be freed 293 // by the caller using a resource mark) 294 // 295 // BCP must refer to the current 'checkcast' opcode for the frame 296 // on top of the stack. 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(JavaThread* thr, const char* name); 301 302 // Fill in the "X cannot be cast to a Y" message for ClassCastException 303 // 304 // @param name the name of the class of the object attempted to be cast 305 // @param klass the name of the target klass attempt 306 // @param gripe the specific kind of problem being reported 307 // @return the dynamically allocated exception message (must be freed 308 // by the caller using a resource mark) 309 // 310 // This version does not require access the frame, so it can be called 311 // from interpreted code 312 // The caller (or one of it's callers) must use a ResourceMark 313 // in order to correctly free the result. 314 // 315 static char* generate_class_cast_message(const char* name, const char* klass, 316 const char* gripe = " cannot be cast to "); 317 318 // Resolves a call site- may patch in the destination of the call into the 319 // compiled code. 320 static methodHandle resolve_helper(JavaThread *thread, 321 bool is_virtual, 322 bool is_optimized, TRAPS); 323 324 private: 325 // deopt blob 326 static void generate_deopt_blob(void); 327 328 public: 329 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 330 331 // Resets a call-site in compiled code so it will get resolved again. 332 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 333 334 // In the code prolog, if the klass comparison fails, the inline cache 335 // misses and the call site is patched to megamorphic 336 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 337 338 // Find the method that called us. 339 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 340 341 342 private: 343 static Handle find_callee_info(JavaThread* thread, 344 Bytecodes::Code& bc, 345 CallInfo& callinfo, TRAPS); 346 static Handle find_callee_info_helper(JavaThread* thread, 347 vframeStream& vfst, 348 Bytecodes::Code& bc, 349 CallInfo& callinfo, TRAPS); 350 351 static address clean_virtual_call_entry(); 352 static address clean_opt_virtual_call_entry(); 353 static address clean_static_call_entry(); 354 355 public: 356 357 // Read the array of BasicTypes from a Java signature, and compute where 358 // compiled Java code would like to put the results. Values in reg_lo and 359 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 360 // registers, those above refer to 4-byte stack slots. All stack slots are 361 // based off of the window top. SharedInfo::stack0 refers to the first usable 362 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 363 // 4-bytes higher. So for sparc because the register window save area is at 364 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 365 // will be just above it. ( 366 // return value is the maximum number of VMReg stack slots the convention will use. 367 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing); 368 369 static void check_member_name_argument_is_last_argument(const methodHandle& method, 370 const BasicType* sig_bt, 371 const VMRegPair* regs) NOT_DEBUG_RETURN; 372 373 // Ditto except for calling C 374 // 375 // C argument in register AND stack slot. 376 // Some architectures require that an argument must be passed in a register 377 // AND in a stack slot. These architectures provide a second VMRegPair array 378 // to be filled by the c_calling_convention method. On other architectures, 379 // NULL is being passed as the second VMRegPair array, so arguments are either 380 // passed in a register OR in a stack slot. 381 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2, 382 int total_args_passed); 383 384 // Compute the new number of arguments in the signature if 32 bit ints 385 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs 386 // is true. 387 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt); 388 // Adapt a method's signature if it contains 32 bit integers that must 389 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs 390 // is true. 391 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count, 392 BasicType*& in_sig_bt, VMRegPair*& in_regs); 393 394 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 395 // blobs. Unlike adapters in the tiger and earlier releases the code in these 396 // blobs does not create a new frame and are therefore virtually invisible 397 // to the stack walking code. In general these blobs extend the callers stack 398 // as needed for the conversion of argument locations. 399 400 // When calling a c2i blob the code will always call the interpreter even if 401 // by the time we reach the blob there is compiled code available. This allows 402 // the blob to pass the incoming stack pointer (the sender sp) in a known 403 // location for the interpreter to record. This is used by the frame code 404 // to correct the sender code to match up with the stack pointer when the 405 // thread left the compiled code. In addition it allows the interpreter 406 // to remove the space the c2i adapter allocated to do its argument conversion. 407 408 // Although a c2i blob will always run interpreted even if compiled code is 409 // present if we see that compiled code is present the compiled call site 410 // will be patched/re-resolved so that later calls will run compiled. 411 412 // Additionally a c2i blob need to have a unverified entry because it can be reached 413 // in situations where the call site is an inlined cache site and may go megamorphic. 414 415 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 416 // that the interpreter before it does any call dispatch will record the current 417 // stack pointer in the interpreter frame. On return it will restore the stack 418 // pointer as needed. This means the i2c adapter code doesn't need any special 419 // handshaking path with compiled code to keep the stack walking correct. 420 421 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 422 int total_args_passed, 423 int max_arg, 424 const BasicType *sig_bt, 425 const VMRegPair *regs, 426 AdapterFingerPrint* fingerprint); 427 428 static void gen_i2c_adapter(MacroAssembler *_masm, 429 int total_args_passed, 430 int comp_args_on_stack, 431 const BasicType *sig_bt, 432 const VMRegPair *regs); 433 434 // OSR support 435 436 // OSR_migration_begin will extract the jvm state from an interpreter 437 // frame (locals, monitors) and store the data in a piece of C heap 438 // storage. This then allows the interpreter frame to be removed from the 439 // stack and the OSR nmethod to be called. That method is called with a 440 // pointer to the C heap storage. This pointer is the return value from 441 // OSR_migration_begin. 442 443 static intptr_t* OSR_migration_begin(JavaThread *thread); 444 445 // OSR_migration_end is a trivial routine. It is called after the compiled 446 // method has extracted the jvm state from the C heap that OSR_migration_begin 447 // created. It's entire job is to simply free this storage. 448 static void OSR_migration_end(intptr_t* buf); 449 450 // Convert a sig into a calling convention register layout 451 // and find interesting things about it. 452 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size); 453 static VMReg name_for_receiver(); 454 455 // "Top of Stack" slots that may be unused by the calling convention but must 456 // otherwise be preserved. 457 // On Intel these are not necessary and the value can be zero. 458 // On Sparc this describes the words reserved for storing a register window 459 // when an interrupt occurs. 460 static uint out_preserve_stack_slots(); 461 462 // Is vector's size (in bytes) bigger than a size saved by default? 463 // For example, on x86 16 bytes XMM registers are saved by default. 464 static bool is_wide_vector(int size); 465 466 // Save and restore a native result 467 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 468 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots); 469 470 // Generate a native wrapper for a given method. The method takes arguments 471 // in the Java compiled code convention, marshals them to the native 472 // convention (handlizes oops, etc), transitions to native, makes the call, 473 // returns to java state (possibly blocking), unhandlizes any result and 474 // returns. 475 // 476 // The wrapper may contain special-case code if the given method 477 // is a JNI critical method, or a compiled method handle adapter, 478 // such as _invokeBasic, _linkToVirtual, etc. 479 static nmethod* generate_native_wrapper(MacroAssembler* masm, 480 const methodHandle& method, 481 int compile_id, 482 BasicType* sig_bt, 483 VMRegPair* regs, 484 BasicType ret_type); 485 486 // Block before entering a JNI critical method 487 static void block_for_jni_critical(JavaThread* thread); 488 489 // A compiled caller has just called the interpreter, but compiled code 490 // exists. Patch the caller so he no longer calls into the interpreter. 491 static void fixup_callers_callsite(Method* moop, address ret_pc); 492 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb); 493 494 // Slow-path Locking and Unlocking 495 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 496 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 497 498 // Resolving of calls 499 static address resolve_static_call_C (JavaThread *thread); 500 static address resolve_virtual_call_C (JavaThread *thread); 501 static address resolve_opt_virtual_call_C(JavaThread *thread); 502 503 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 504 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 505 oopDesc* dest, jint dest_pos, 506 jint length, JavaThread* thread); 507 508 // handle ic miss with caller being compiled code 509 // wrong method handling (inline cache misses, zombie methods) 510 static address handle_wrong_method(JavaThread* thread); 511 static address handle_wrong_method_abstract(JavaThread* thread); 512 static address handle_wrong_method_ic_miss(JavaThread* thread); 513 514#ifndef PRODUCT 515 516 // Collect and print inline cache miss statistics 517 private: 518 enum { maxICmiss_count = 100 }; 519 static int _ICmiss_index; // length of IC miss histogram 520 static int _ICmiss_count[maxICmiss_count]; // miss counts 521 static address _ICmiss_at[maxICmiss_count]; // miss addresses 522 static void trace_ic_miss(address at); 523 524 public: 525 static int _throw_null_ctr; // throwing a null-pointer exception 526 static int _ic_miss_ctr; // total # of IC misses 527 static int _wrong_method_ctr; 528 static int _resolve_static_ctr; 529 static int _resolve_virtual_ctr; 530 static int _resolve_opt_virtual_ctr; 531 static int _implicit_null_throws; 532 static int _implicit_div0_throws; 533 534 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 535 static int _jshort_array_copy_ctr; // Slow-path short array copy 536 static int _jint_array_copy_ctr; // Slow-path int array copy 537 static int _jlong_array_copy_ctr; // Slow-path long array copy 538 static int _oop_array_copy_ctr; // Slow-path oop array copy 539 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 540 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 541 static int _generic_array_copy_ctr; // Slow-path includes type decoding 542 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 543 544 static int _new_instance_ctr; // 'new' object requires GC 545 static int _new_array_ctr; // 'new' array requires GC 546 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 547 static int _find_handler_ctr; // find exception handler 548 static int _rethrow_ctr; // rethrow exception 549 static int _mon_enter_stub_ctr; // monitor enter stub 550 static int _mon_exit_stub_ctr; // monitor exit stub 551 static int _mon_enter_ctr; // monitor enter slow 552 static int _mon_exit_ctr; // monitor exit slow 553 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 554 555 // Statistics code 556 // stats for "normal" compiled calls (non-interface) 557 static int _nof_normal_calls; // total # of calls 558 static int _nof_optimized_calls; // total # of statically-bound calls 559 static int _nof_inlined_calls; // total # of inlined normal calls 560 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 561 static int _nof_inlined_static_calls; // total # of inlined static calls 562 // stats for compiled interface calls 563 static int _nof_interface_calls; // total # of compiled calls 564 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 565 static int _nof_inlined_interface_calls; // total # of inlined interface calls 566 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 567 // stats for runtime exceptions 568 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 569 570 public: // for compiler 571 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 572 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 573 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 574 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 575 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 576 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 577 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 578 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 579 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 580 static void print_call_statistics(int comp_total); 581 static void print_statistics(); 582 static void print_ic_miss_histogram(); 583 584#endif // PRODUCT 585}; 586 587 588// --------------------------------------------------------------------------- 589// Implementation of AdapterHandlerLibrary 590// 591// This library manages argument marshaling adapters and native wrappers. 592// There are 2 flavors of adapters: I2C and C2I. 593// 594// The I2C flavor takes a stock interpreted call setup, marshals the 595// arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 596// code_begin(). It is broken to call it without an nmethod assigned. 597// The usual behavior is to lift any register arguments up out of the 598// stack and possibly re-pack the extra arguments to be contiguous. 599// I2C adapters will save what the interpreter's stack pointer will be 600// after arguments are popped, then adjust the interpreter's frame 601// size to force alignment and possibly to repack the arguments. 602// After re-packing, it jumps to the compiled code start. There are 603// no safepoints in this adapter code and a GC cannot happen while 604// marshaling is in progress. 605// 606// The C2I flavor takes a stock compiled call setup plus the target method in 607// Rmethod, marshals the arguments for an interpreted call and jumps to 608// Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 609// setup. Compiled frames are fixed-size and the args are likely not in the 610// right place. Hence all the args will likely be copied into the 611// interpreter's frame, forcing that frame to grow. The compiled frame's 612// outgoing stack args will be dead after the copy. 613// 614// Native wrappers, like adapters, marshal arguments. Unlike adapters they 615// also perform an official frame push & pop. They have a call to the native 616// routine in their middles and end in a return (instead of ending in a jump). 617// The native wrappers are stored in real nmethods instead of the BufferBlobs 618// used by the adapters. The code generation happens here because it's very 619// similar to what the adapters have to do. 620 621class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 622 friend class AdapterHandlerTable; 623 624 private: 625 AdapterFingerPrint* _fingerprint; 626 address _i2c_entry; 627 address _c2i_entry; 628 address _c2i_unverified_entry; 629 630#ifdef ASSERT 631 // Captures code and signature used to generate this adapter when 632 // verifying adapter equivalence. 633 unsigned char* _saved_code; 634 int _saved_code_length; 635#endif 636 637 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 638 _fingerprint = fingerprint; 639 _i2c_entry = i2c_entry; 640 _c2i_entry = c2i_entry; 641 _c2i_unverified_entry = c2i_unverified_entry; 642#ifdef ASSERT 643 _saved_code = NULL; 644 _saved_code_length = 0; 645#endif 646 } 647 648 void deallocate(); 649 650 // should never be used 651 AdapterHandlerEntry(); 652 653 public: 654 address get_i2c_entry() const { return _i2c_entry; } 655 address get_c2i_entry() const { return _c2i_entry; } 656 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 657 address base_address(); 658 void relocate(address new_base); 659 660 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 661 662 AdapterHandlerEntry* next() { 663 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 664 } 665 666#ifdef ASSERT 667 // Used to verify that code generated for shared adapters is equivalent 668 void save_code (unsigned char* code, int length); 669 bool compare_code(unsigned char* code, int length); 670#endif 671 672 //virtual void print_on(outputStream* st) const; DO NOT USE 673 void print_adapter_on(outputStream* st) const; 674}; 675 676class AdapterHandlerLibrary: public AllStatic { 677 private: 678 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 679 static AdapterHandlerTable* _adapters; 680 static AdapterHandlerEntry* _abstract_method_handler; 681 static BufferBlob* buffer_blob(); 682 static void initialize(); 683 684 public: 685 686 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 687 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 688 static void create_native_wrapper(const methodHandle& method); 689 static AdapterHandlerEntry* get_adapter(const methodHandle& method); 690 691 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } 692 static void print_handler_on(outputStream* st, const CodeBlob* b); 693 static bool contains(const CodeBlob* b); 694#ifndef PRODUCT 695 static void print_statistics(); 696#endif // PRODUCT 697 698}; 699 700#endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 701