sharedRuntime.hpp revision 3602:da91efe96a93
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 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* _ic_miss_blob; 59 static RuntimeStub* _resolve_opt_virtual_call_blob; 60 static RuntimeStub* _resolve_virtual_call_blob; 61 static RuntimeStub* _resolve_static_call_blob; 62 63 static DeoptimizationBlob* _deopt_blob; 64 65 static SafepointBlob* _polling_page_safepoint_handler_blob; 66 static SafepointBlob* _polling_page_return_handler_blob; 67 68#ifdef COMPILER2 69 static UncommonTrapBlob* _uncommon_trap_blob; 70#endif // COMPILER2 71 72#ifndef PRODUCT 73 // Counters 74 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable) 75#endif // !PRODUCT 76 77 private: 78 static SafepointBlob* generate_handler_blob(address call_ptr, bool cause_return); 79 static RuntimeStub* generate_resolve_blob(address destination, const char* name); 80 81 public: 82 static void generate_stubs(void); 83 84 // max bytes for each dtrace string parameter 85 enum { max_dtrace_string_size = 256 }; 86 87 // The following arithmetic routines are used on platforms that do 88 // not have machine instructions to implement their functionality. 89 // Do not remove these. 90 91 // long arithmetics 92 static jlong lmul(jlong y, jlong x); 93 static jlong ldiv(jlong y, jlong x); 94 static jlong lrem(jlong y, jlong x); 95 96 // float and double remainder 97 static jfloat frem(jfloat x, jfloat y); 98 static jdouble drem(jdouble x, jdouble y); 99 100#ifdef __SOFTFP__ 101 static jfloat fadd(jfloat x, jfloat y); 102 static jfloat fsub(jfloat x, jfloat y); 103 static jfloat fmul(jfloat x, jfloat y); 104 static jfloat fdiv(jfloat x, jfloat y); 105 106 static jdouble dadd(jdouble x, jdouble y); 107 static jdouble dsub(jdouble x, jdouble y); 108 static jdouble dmul(jdouble x, jdouble y); 109 static jdouble ddiv(jdouble x, jdouble y); 110#endif // __SOFTFP__ 111 112 // float conversion (needs to set appropriate rounding mode) 113 static jint f2i (jfloat x); 114 static jlong f2l (jfloat x); 115 static jint d2i (jdouble x); 116 static jlong d2l (jdouble x); 117 static jfloat d2f (jdouble x); 118 static jfloat l2f (jlong x); 119 static jdouble l2d (jlong x); 120 121#ifdef __SOFTFP__ 122 static jfloat i2f (jint x); 123 static jdouble i2d (jint x); 124 static jdouble f2d (jfloat x); 125#endif // __SOFTFP__ 126 127 // double trigonometrics and transcendentals 128 static jdouble dsin(jdouble x); 129 static jdouble dcos(jdouble x); 130 static jdouble dtan(jdouble x); 131 static jdouble dlog(jdouble x); 132 static jdouble dlog10(jdouble x); 133 static jdouble dexp(jdouble x); 134 static jdouble dpow(jdouble x, jdouble y); 135 136#if defined(__SOFTFP__) || defined(E500V2) 137 static double dabs(double f); 138#endif 139 140#if defined(__SOFTFP__) || defined(PPC) 141 static double dsqrt(double f); 142#endif 143 144#ifdef __SOFTFP__ 145 // C++ compiler generates soft float instructions as well as passing 146 // float and double in registers. 147 static int fcmpl(float x, float y); 148 static int fcmpg(float x, float y); 149 static int dcmpl(double x, double y); 150 static int dcmpg(double x, double y); 151 152 static int unordered_fcmplt(float x, float y); 153 static int unordered_dcmplt(double x, double y); 154 static int unordered_fcmple(float x, float y); 155 static int unordered_dcmple(double x, double y); 156 static int unordered_fcmpge(float x, float y); 157 static int unordered_dcmpge(double x, double y); 158 static int unordered_fcmpgt(float x, float y); 159 static int unordered_dcmpgt(double x, double y); 160 161 static float fneg(float f); 162 static double dneg(double f); 163#endif 164 165 // exception handling across interpreter/compiler boundaries 166 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address); 167 static address exception_handler_for_return_address(JavaThread* thread, address return_address); 168 169#ifndef SERIALGC 170 // G1 write barriers 171 static void g1_wb_pre(oopDesc* orig, JavaThread *thread); 172 static void g1_wb_post(void* card_addr, JavaThread* thread); 173#endif // !SERIALGC 174 175 // exception handling and implicit exceptions 176 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, 177 bool force_unwind, bool top_frame_only); 178 enum ImplicitExceptionKind { 179 IMPLICIT_NULL, 180 IMPLICIT_DIVIDE_BY_ZERO, 181 STACK_OVERFLOW 182 }; 183 static void throw_AbstractMethodError(JavaThread* thread); 184 static void throw_IncompatibleClassChangeError(JavaThread* thread); 185 static void throw_ArithmeticException(JavaThread* thread); 186 static void throw_NullPointerException(JavaThread* thread); 187 static void throw_NullPointerException_at_call(JavaThread* thread); 188 static void throw_StackOverflowError(JavaThread* thread); 189 static address continuation_for_implicit_exception(JavaThread* thread, 190 address faulting_pc, 191 ImplicitExceptionKind exception_kind); 192 193 // Shared stub locations 194 static address get_poll_stub(address pc); 195 196 static address get_ic_miss_stub() { 197 assert(_ic_miss_blob!= NULL, "oops"); 198 return _ic_miss_blob->entry_point(); 199 } 200 201 static address get_handle_wrong_method_stub() { 202 assert(_wrong_method_blob!= NULL, "oops"); 203 return _wrong_method_blob->entry_point(); 204 } 205 206#ifdef COMPILER2 207 static void generate_uncommon_trap_blob(void); 208 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; } 209#endif // COMPILER2 210 211 static address get_resolve_opt_virtual_call_stub(){ 212 assert(_resolve_opt_virtual_call_blob != NULL, "oops"); 213 return _resolve_opt_virtual_call_blob->entry_point(); 214 } 215 static address get_resolve_virtual_call_stub() { 216 assert(_resolve_virtual_call_blob != NULL, "oops"); 217 return _resolve_virtual_call_blob->entry_point(); 218 } 219 static address get_resolve_static_call_stub() { 220 assert(_resolve_static_call_blob != NULL, "oops"); 221 return _resolve_static_call_blob->entry_point(); 222 } 223 224 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; } 225 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; } 226 227 // Counters 228#ifndef PRODUCT 229 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; } 230#endif // PRODUCT 231 232 // Helper routine for full-speed JVMTI exception throwing support 233 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception); 234 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL); 235 236 // RedefineClasses() tracing support for obsolete method entry 237 static int rc_trace_method_entry(JavaThread* thread, Method* m); 238 239 // To be used as the entry point for unresolved native methods. 240 static address native_method_throw_unsatisfied_link_error_entry(); 241 static address native_method_throw_unsupported_operation_exception_entry(); 242 243 // bytecode tracing is only used by the TraceBytecodes 244 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0; 245 246 // Used to back off a spin lock that is under heavy contention 247 static void yield_all(JavaThread* thread, int attempts = 0); 248 249 static oop retrieve_receiver( Symbol* sig, frame caller ); 250 251 static void register_finalizer(JavaThread* thread, oopDesc* obj); 252 253 // dtrace notifications 254 static int dtrace_object_alloc(oopDesc* o); 255 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o); 256 static int dtrace_method_entry(JavaThread* thread, Method* m); 257 static int dtrace_method_exit(JavaThread* thread, Method* m); 258 259 // Utility method for retrieving the Java thread id, returns 0 if the 260 // thread is not a well formed Java thread. 261 static jlong get_java_tid(Thread* thread); 262 263 264 // used by native wrappers to reenable yellow if overflow happened in native code 265 static void reguard_yellow_pages(); 266 267 /** 268 * Fill in the "X cannot be cast to a Y" message for ClassCastException 269 * 270 * @param thr the current thread 271 * @param name the name of the class of the object attempted to be cast 272 * @return the dynamically allocated exception message (must be freed 273 * by the caller using a resource mark) 274 * 275 * BCP must refer to the current 'checkcast' opcode for the frame 276 * on top of the stack. 277 * The caller (or one of it's callers) must use a ResourceMark 278 * in order to correctly free the result. 279 */ 280 static char* generate_class_cast_message(JavaThread* thr, const char* name); 281 282 /** 283 * Fill in the "X cannot be cast to a Y" message for ClassCastException 284 * 285 * @param name the name of the class of the object attempted to be cast 286 * @param klass the name of the target klass attempt 287 * @param gripe the specific kind of problem being reported 288 * @return the dynamically allocated exception message (must be freed 289 * by the caller using a resource mark) 290 * 291 * This version does not require access the frame, so it can be called 292 * from interpreted code 293 * The caller (or one of it's callers) must use a ResourceMark 294 * in order to correctly free the result. 295 */ 296 static char* generate_class_cast_message(const char* name, const char* klass, 297 const char* gripe = " cannot be cast to "); 298 299 // Resolves a call site- may patch in the destination of the call into the 300 // compiled code. 301 static methodHandle resolve_helper(JavaThread *thread, 302 bool is_virtual, 303 bool is_optimized, TRAPS); 304 305 private: 306 // deopt blob 307 static void generate_deopt_blob(void); 308 309 public: 310 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; } 311 312 // Resets a call-site in compiled code so it will get resolved again. 313 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS); 314 315 // In the code prolog, if the klass comparison fails, the inline cache 316 // misses and the call site is patched to megamorphic 317 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS); 318 319 // Find the method that called us. 320 static methodHandle find_callee_method(JavaThread* thread, TRAPS); 321 322 323 private: 324 static Handle find_callee_info(JavaThread* thread, 325 Bytecodes::Code& bc, 326 CallInfo& callinfo, TRAPS); 327 static Handle find_callee_info_helper(JavaThread* thread, 328 vframeStream& vfst, 329 Bytecodes::Code& bc, 330 CallInfo& callinfo, TRAPS); 331 332 static address clean_virtual_call_entry(); 333 static address clean_opt_virtual_call_entry(); 334 static address clean_static_call_entry(); 335 336 public: 337 338 // Read the array of BasicTypes from a Java signature, and compute where 339 // compiled Java code would like to put the results. Values in reg_lo and 340 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are 341 // registers, those above refer to 4-byte stack slots. All stack slots are 342 // based off of the window top. SharedInfo::stack0 refers to the first usable 343 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word 344 // 4-bytes higher. So for sparc because the register window save area is at 345 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0 346 // will be just above it. ( 347 // return value is the maximum number of VMReg stack slots the convention will use. 348 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing); 349 350 // Ditto except for calling C 351 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed); 352 353 // Generate I2C and C2I adapters. These adapters are simple argument marshalling 354 // blobs. Unlike adapters in the tiger and earlier releases the code in these 355 // blobs does not create a new frame and are therefore virtually invisible 356 // to the stack walking code. In general these blobs extend the callers stack 357 // as needed for the conversion of argument locations. 358 359 // When calling a c2i blob the code will always call the interpreter even if 360 // by the time we reach the blob there is compiled code available. This allows 361 // the blob to pass the incoming stack pointer (the sender sp) in a known 362 // location for the interpreter to record. This is used by the frame code 363 // to correct the sender code to match up with the stack pointer when the 364 // thread left the compiled code. In addition it allows the interpreter 365 // to remove the space the c2i adapter allocated to do it argument conversion. 366 367 // Although a c2i blob will always run interpreted even if compiled code is 368 // present if we see that compiled code is present the compiled call site 369 // will be patched/re-resolved so that later calls will run compiled. 370 371 // Aditionally a c2i blob need to have a unverified entry because it can be reached 372 // in situations where the call site is an inlined cache site and may go megamorphic. 373 374 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed 375 // that the interpreter before it does any call dispatch will record the current 376 // stack pointer in the interpreter frame. On return it will restore the stack 377 // pointer as needed. This means the i2c adapter code doesn't need any special 378 // handshaking path with compiled code to keep the stack walking correct. 379 380 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm, 381 int total_args_passed, 382 int max_arg, 383 const BasicType *sig_bt, 384 const VMRegPair *regs, 385 AdapterFingerPrint* fingerprint); 386 387 // OSR support 388 389 // OSR_migration_begin will extract the jvm state from an interpreter 390 // frame (locals, monitors) and store the data in a piece of C heap 391 // storage. This then allows the interpreter frame to be removed from the 392 // stack and the OSR nmethod to be called. That method is called with a 393 // pointer to the C heap storage. This pointer is the return value from 394 // OSR_migration_begin. 395 396 static intptr_t* OSR_migration_begin( JavaThread *thread); 397 398 // OSR_migration_end is a trivial routine. It is called after the compiled 399 // method has extracted the jvm state from the C heap that OSR_migration_begin 400 // created. It's entire job is to simply free this storage. 401 static void OSR_migration_end ( intptr_t* buf); 402 403 // Convert a sig into a calling convention register layout 404 // and find interesting things about it. 405 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, int *arg_size); 406 static VMReg name_for_receiver(); 407 408 // "Top of Stack" slots that may be unused by the calling convention but must 409 // otherwise be preserved. 410 // On Intel these are not necessary and the value can be zero. 411 // On Sparc this describes the words reserved for storing a register window 412 // when an interrupt occurs. 413 static uint out_preserve_stack_slots(); 414 415 // Save and restore a native result 416 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 417 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots ); 418 419 // Generate a native wrapper for a given method. The method takes arguments 420 // in the Java compiled code convention, marshals them to the native 421 // convention (handlizes oops, etc), transitions to native, makes the call, 422 // returns to java state (possibly blocking), unhandlizes any result and 423 // returns. 424 // 425 // The wrapper may contain special-case code if the given method 426 // is a JNI critical method, or a compiled method handle adapter, 427 // such as _invokeBasic, _linkToVirtual, etc. 428 static nmethod *generate_native_wrapper(MacroAssembler* masm, 429 methodHandle method, 430 int compile_id, 431 int total_args_passed, 432 int max_arg, 433 BasicType *sig_bt, 434 VMRegPair *regs, 435 BasicType ret_type ); 436 437 // Block before entering a JNI critical method 438 static void block_for_jni_critical(JavaThread* thread); 439 440#ifdef HAVE_DTRACE_H 441 // Generate a dtrace wrapper for a given method. The method takes arguments 442 // in the Java compiled code convention, marshals them to the native 443 // convention (handlizes oops, etc), transitions to native, makes the call, 444 // returns to java state (possibly blocking), unhandlizes any result and 445 // returns. 446 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm, 447 methodHandle method); 448 449 // dtrace support to convert a Java string to utf8 450 static void get_utf(oopDesc* src, address dst); 451#endif // def HAVE_DTRACE_H 452 453 // A compiled caller has just called the interpreter, but compiled code 454 // exists. Patch the caller so he no longer calls into the interpreter. 455 static void fixup_callers_callsite(Method* moop, address ret_pc); 456 457 // Slow-path Locking and Unlocking 458 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread); 459 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock); 460 461 // Resolving of calls 462 static address resolve_static_call_C (JavaThread *thread); 463 static address resolve_virtual_call_C (JavaThread *thread); 464 static address resolve_opt_virtual_call_C(JavaThread *thread); 465 466 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.) 467 static void slow_arraycopy_C(oopDesc* src, jint src_pos, 468 oopDesc* dest, jint dest_pos, 469 jint length, JavaThread* thread); 470 471 // handle ic miss with caller being compiled code 472 // wrong method handling (inline cache misses, zombie methods) 473 static address handle_wrong_method(JavaThread* thread); 474 static address handle_wrong_method_ic_miss(JavaThread* thread); 475 476#ifndef PRODUCT 477 478 // Collect and print inline cache miss statistics 479 private: 480 enum { maxICmiss_count = 100 }; 481 static int _ICmiss_index; // length of IC miss histogram 482 static int _ICmiss_count[maxICmiss_count]; // miss counts 483 static address _ICmiss_at[maxICmiss_count]; // miss addresses 484 static void trace_ic_miss(address at); 485 486 public: 487 static int _monitor_enter_ctr; // monitor enter slow 488 static int _monitor_exit_ctr; // monitor exit slow 489 static int _throw_null_ctr; // throwing a null-pointer exception 490 static int _ic_miss_ctr; // total # of IC misses 491 static int _wrong_method_ctr; 492 static int _resolve_static_ctr; 493 static int _resolve_virtual_ctr; 494 static int _resolve_opt_virtual_ctr; 495 static int _implicit_null_throws; 496 static int _implicit_div0_throws; 497 498 static int _jbyte_array_copy_ctr; // Slow-path byte array copy 499 static int _jshort_array_copy_ctr; // Slow-path short array copy 500 static int _jint_array_copy_ctr; // Slow-path int array copy 501 static int _jlong_array_copy_ctr; // Slow-path long array copy 502 static int _oop_array_copy_ctr; // Slow-path oop array copy 503 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast 504 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks 505 static int _generic_array_copy_ctr; // Slow-path includes type decoding 506 static int _slow_array_copy_ctr; // Slow-path failed out to a method call 507 508 static int _new_instance_ctr; // 'new' object requires GC 509 static int _new_array_ctr; // 'new' array requires GC 510 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr; 511 static int _find_handler_ctr; // find exception handler 512 static int _rethrow_ctr; // rethrow exception 513 static int _mon_enter_stub_ctr; // monitor enter stub 514 static int _mon_exit_stub_ctr; // monitor exit stub 515 static int _mon_enter_ctr; // monitor enter slow 516 static int _mon_exit_ctr; // monitor exit slow 517 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check 518 519 // Statistics code 520 // stats for "normal" compiled calls (non-interface) 521 static int _nof_normal_calls; // total # of calls 522 static int _nof_optimized_calls; // total # of statically-bound calls 523 static int _nof_inlined_calls; // total # of inlined normal calls 524 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial) 525 static int _nof_inlined_static_calls; // total # of inlined static calls 526 // stats for compiled interface calls 527 static int _nof_interface_calls; // total # of compiled calls 528 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls 529 static int _nof_inlined_interface_calls; // total # of inlined interface calls 530 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls 531 // stats for runtime exceptions 532 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining 533 534 public: // for compiler 535 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; } 536 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; } 537 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; } 538 static address nof_static_calls_addr() { return (address)&_nof_static_calls; } 539 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; } 540 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; } 541 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; } 542 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; } 543 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; } 544 static void print_call_statistics(int comp_total); 545 static void print_statistics(); 546 static void print_ic_miss_histogram(); 547 548#endif // PRODUCT 549}; 550 551 552// --------------------------------------------------------------------------- 553// Implementation of AdapterHandlerLibrary 554// 555// This library manages argument marshaling adapters and native wrappers. 556// There are 2 flavors of adapters: I2C and C2I. 557// 558// The I2C flavor takes a stock interpreted call setup, marshals the 559// arguments for a Java-compiled call, and jumps to Rmethod-> code()-> 560// code_begin(). It is broken to call it without an nmethod assigned. 561// The usual behavior is to lift any register arguments up out of the 562// stack and possibly re-pack the extra arguments to be contigious. 563// I2C adapters will save what the interpreter's stack pointer will be 564// after arguments are popped, then adjust the interpreter's frame 565// size to force alignment and possibly to repack the arguments. 566// After re-packing, it jumps to the compiled code start. There are 567// no safepoints in this adapter code and a GC cannot happen while 568// marshaling is in progress. 569// 570// The C2I flavor takes a stock compiled call setup plus the target method in 571// Rmethod, marshals the arguments for an interpreted call and jumps to 572// Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been 573// setup. Compiled frames are fixed-size and the args are likely not in the 574// right place. Hence all the args will likely be copied into the 575// interpreter's frame, forcing that frame to grow. The compiled frame's 576// outgoing stack args will be dead after the copy. 577// 578// Native wrappers, like adapters, marshal arguments. Unlike adapters they 579// also perform an offical frame push & pop. They have a call to the native 580// routine in their middles and end in a return (instead of ending in a jump). 581// The native wrappers are stored in real nmethods instead of the BufferBlobs 582// used by the adapters. The code generation happens here because it's very 583// similar to what the adapters have to do. 584 585class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> { 586 friend class AdapterHandlerTable; 587 588 private: 589 AdapterFingerPrint* _fingerprint; 590 address _i2c_entry; 591 address _c2i_entry; 592 address _c2i_unverified_entry; 593 594#ifdef ASSERT 595 // Captures code and signature used to generate this adapter when 596 // verifing adapter equivalence. 597 unsigned char* _saved_code; 598 int _code_length; 599 BasicType* _saved_sig; 600 int _total_args_passed; 601#endif 602 603 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) { 604 _fingerprint = fingerprint; 605 _i2c_entry = i2c_entry; 606 _c2i_entry = c2i_entry; 607 _c2i_unverified_entry = c2i_unverified_entry; 608#ifdef ASSERT 609 _saved_code = NULL; 610 _code_length = 0; 611 _saved_sig = NULL; 612 _total_args_passed = 0; 613#endif 614 } 615 616 void deallocate(); 617 618 // should never be used 619 AdapterHandlerEntry(); 620 621 public: 622 address get_i2c_entry() const { return _i2c_entry; } 623 address get_c2i_entry() const { return _c2i_entry; } 624 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } 625 626 address base_address(); 627 void relocate(address new_base); 628 629 AdapterFingerPrint* fingerprint() const { return _fingerprint; } 630 631 AdapterHandlerEntry* next() { 632 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next(); 633 } 634 635#ifdef ASSERT 636 // Used to verify that code generated for shared adapters is equivalent 637 void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt); 638 bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt); 639#endif 640 641 //virtual void print_on(outputStream* st) const; DO NOT USE 642 void print_adapter_on(outputStream* st) const; 643}; 644 645class AdapterHandlerLibrary: public AllStatic { 646 private: 647 static BufferBlob* _buffer; // the temporary code buffer in CodeCache 648 static AdapterHandlerTable* _adapters; 649 static AdapterHandlerEntry* _abstract_method_handler; 650 static BufferBlob* buffer_blob(); 651 static void initialize(); 652 653 public: 654 655 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, 656 address i2c_entry, address c2i_entry, address c2i_unverified_entry); 657 static nmethod* create_native_wrapper(methodHandle method, int compile_id); 658 static AdapterHandlerEntry* get_adapter(methodHandle method); 659 660#ifdef HAVE_DTRACE_H 661 static nmethod* create_dtrace_nmethod (methodHandle method); 662#endif // HAVE_DTRACE_H 663 664 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); } 665 static void print_handler_on(outputStream* st, CodeBlob* b); 666 static bool contains(CodeBlob* b); 667#ifndef PRODUCT 668 static void print_statistics(); 669#endif /* PRODUCT */ 670 671}; 672 673#endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP 674