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 
  36 class AdapterHandlerEntry;
  37 class AdapterHandlerTable;
  38 class AdapterFingerPrint;
  39 class vframeStream;
  40 
  41 // Used for adapter generation. One SigEntry is used per element of
  42 // the signature of the method. Value type arguments are treated
  43 // specially. See comment for collect_fields().
  44 class SigEntry VALUE_OBJ_CLASS_SPEC {
  45  public:
  46   BasicType _bt;
  47   int _offset;
  48 
  49   SigEntry()
  50     : _bt(T_ILLEGAL), _offset(-1) {
  51   }
  52   SigEntry(BasicType bt, int offset)
  53     : _bt(bt), _offset(offset) {}
  54 
  55   SigEntry(BasicType bt)
  56     : _bt(bt), _offset(-1) {}
  57 
  58   static int compare(SigEntry* e1, SigEntry* e2) {
  59     if (e1->_offset != e2->_offset) {
  60       return e1->_offset - e2->_offset;
  61     }
  62     assert((e1->_bt == T_LONG && (e2->_bt == T_LONG || e2->_bt == T_VOID)) ||
  63            (e1->_bt == T_DOUBLE && (e2->_bt == T_DOUBLE || e2->_bt == T_VOID)) ||
  64            e1->_bt == T_VALUETYPE || e2->_bt == T_VALUETYPE || e1->_bt == T_VOID || e2->_bt == T_VOID, "bad bt");
  65     if (e1->_bt == e2->_bt) {
  66       assert(e1->_bt == T_VALUETYPE || e1->_bt == T_VOID, "only ones with duplicate offsets");
  67       return 0;
  68     }
  69     if (e1->_bt == T_VOID ||
  70         e2->_bt == T_VALUETYPE) {
  71       return 1;
  72     }
  73     if (e1->_bt == T_VALUETYPE ||
  74         e2->_bt == T_VOID) {
  75       return -1;
  76     }
  77     ShouldNotReachHere();
  78     return 0;
  79   }
  80 };
  81 
  82 
  83 // Runtime is the base class for various runtime interfaces
  84 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
  85 // shared functionality such as exception forwarding (C++ to
  86 // Java exceptions), locking/unlocking mechanisms, statistical
  87 // information, etc.
  88 
  89 class SharedRuntime: AllStatic {
  90   friend class VMStructs;
  91 
  92  private:
  93   static methodHandle resolve_sub_helper(JavaThread *thread,
  94                                          bool is_virtual,
  95                                          bool is_optimized, TRAPS);
  96 
  97   // Shared stub locations
  98 
  99   static RuntimeStub*        _wrong_method_blob;
 100   static RuntimeStub*        _wrong_method_abstract_blob;
 101   static RuntimeStub*        _ic_miss_blob;
 102   static RuntimeStub*        _resolve_opt_virtual_call_blob;
 103   static RuntimeStub*        _resolve_virtual_call_blob;
 104   static RuntimeStub*        _resolve_static_call_blob;
 105 
 106   static DeoptimizationBlob* _deopt_blob;
 107 
 108   static SafepointBlob*      _polling_page_vectors_safepoint_handler_blob;
 109   static SafepointBlob*      _polling_page_safepoint_handler_blob;
 110   static SafepointBlob*      _polling_page_return_handler_blob;
 111 
 112 #ifdef COMPILER2
 113   static UncommonTrapBlob*   _uncommon_trap_blob;
 114 #endif // COMPILER2
 115 
 116 #ifndef PRODUCT
 117   // Counters
 118   static int     _nof_megamorphic_calls;         // total # of megamorphic calls (through vtable)
 119 #endif // !PRODUCT
 120 
 121  private:
 122   enum { POLL_AT_RETURN,  POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
 123   static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
 124   static RuntimeStub*   generate_resolve_blob(address destination, const char* name);
 125 
 126  public:
 127   static void generate_stubs(void);
 128 
 129   // max bytes for each dtrace string parameter
 130   enum { max_dtrace_string_size = 256 };
 131 
 132   // The following arithmetic routines are used on platforms that do
 133   // not have machine instructions to implement their functionality.
 134   // Do not remove these.
 135 
 136   // long arithmetics
 137   static jlong   lmul(jlong y, jlong x);
 138   static jlong   ldiv(jlong y, jlong x);
 139   static jlong   lrem(jlong y, jlong x);
 140 
 141   // float and double remainder
 142   static jfloat  frem(jfloat  x, jfloat  y);
 143   static jdouble drem(jdouble x, jdouble y);
 144 
 145 
 146 #ifdef _WIN64
 147   // Workaround for fmod issue in the Windows x64 CRT
 148   static double fmod_winx64(double x, double y);
 149 #endif
 150 
 151 #ifdef __SOFTFP__
 152   static jfloat  fadd(jfloat x, jfloat y);
 153   static jfloat  fsub(jfloat x, jfloat y);
 154   static jfloat  fmul(jfloat x, jfloat y);
 155   static jfloat  fdiv(jfloat x, jfloat y);
 156 
 157   static jdouble dadd(jdouble x, jdouble y);
 158   static jdouble dsub(jdouble x, jdouble y);
 159   static jdouble dmul(jdouble x, jdouble y);
 160   static jdouble ddiv(jdouble x, jdouble y);
 161 #endif // __SOFTFP__
 162 
 163   // float conversion (needs to set appropriate rounding mode)
 164   static jint    f2i (jfloat  x);
 165   static jlong   f2l (jfloat  x);
 166   static jint    d2i (jdouble x);
 167   static jlong   d2l (jdouble x);
 168   static jfloat  d2f (jdouble x);
 169   static jfloat  l2f (jlong   x);
 170   static jdouble l2d (jlong   x);
 171 
 172 #ifdef __SOFTFP__
 173   static jfloat  i2f (jint    x);
 174   static jdouble i2d (jint    x);
 175   static jdouble f2d (jfloat  x);
 176 #endif // __SOFTFP__
 177 
 178   // double trigonometrics and transcendentals
 179   static jdouble dsin(jdouble x);
 180   static jdouble dcos(jdouble x);
 181   static jdouble dtan(jdouble x);
 182   static jdouble dlog(jdouble x);
 183   static jdouble dlog10(jdouble x);
 184   static jdouble dexp(jdouble x);
 185   static jdouble dpow(jdouble x, jdouble y);
 186 
 187 #if defined(__SOFTFP__) || defined(E500V2)
 188   static double dabs(double f);
 189 #endif
 190 
 191 #if defined(__SOFTFP__) || defined(PPC)
 192   static double dsqrt(double f);
 193 #endif
 194 
 195   // Montgomery multiplication
 196   static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
 197                                   jint len, jlong inv, jint *m_ints);
 198   static void montgomery_square(jint *a_ints, jint *n_ints,
 199                                 jint len, jlong inv, jint *m_ints);
 200 
 201 #ifdef __SOFTFP__
 202   // C++ compiler generates soft float instructions as well as passing
 203   // float and double in registers.
 204   static int  fcmpl(float x, float y);
 205   static int  fcmpg(float x, float y);
 206   static int  dcmpl(double x, double y);
 207   static int  dcmpg(double x, double y);
 208 
 209   static int unordered_fcmplt(float x, float y);
 210   static int unordered_dcmplt(double x, double y);
 211   static int unordered_fcmple(float x, float y);
 212   static int unordered_dcmple(double x, double y);
 213   static int unordered_fcmpge(float x, float y);
 214   static int unordered_dcmpge(double x, double y);
 215   static int unordered_fcmpgt(float x, float y);
 216   static int unordered_dcmpgt(double x, double y);
 217 
 218   static float  fneg(float f);
 219   static double dneg(double f);
 220 #endif
 221 
 222   // exception handling across interpreter/compiler boundaries
 223   static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
 224   static address exception_handler_for_return_address(JavaThread* thread, address return_address);
 225 
 226 #if INCLUDE_ALL_GCS
 227   // G1 write barriers
 228   static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
 229   static void g1_wb_post(void* card_addr, JavaThread* thread);
 230 #endif // INCLUDE_ALL_GCS
 231 
 232   // exception handling and implicit exceptions
 233   static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
 234                                               bool force_unwind, bool top_frame_only);
 235   enum ImplicitExceptionKind {
 236     IMPLICIT_NULL,
 237     IMPLICIT_DIVIDE_BY_ZERO,
 238     STACK_OVERFLOW
 239   };
 240   static void    throw_AbstractMethodError(JavaThread* thread);
 241   static void    throw_IncompatibleClassChangeError(JavaThread* thread);
 242   static void    throw_ArithmeticException(JavaThread* thread);
 243   static void    throw_NullPointerException(JavaThread* thread);
 244   static void    throw_NullPointerException_at_call(JavaThread* thread);
 245   static void    throw_StackOverflowError(JavaThread* thread);
 246   static void    throw_delayed_StackOverflowError(JavaThread* thread);
 247   static void    throw_StackOverflowError_common(JavaThread* thread, bool delayed);
 248   static address continuation_for_implicit_exception(JavaThread* thread,
 249                                                      address faulting_pc,
 250                                                      ImplicitExceptionKind exception_kind);
 251 #if INCLUDE_JVMCI
 252   static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, nmethod* nm, int deopt_reason);
 253 #endif
 254 
 255   static void enable_stack_reserved_zone(JavaThread* thread);
 256   static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
 257 
 258   // Shared stub locations
 259   static address get_poll_stub(address pc);
 260 
 261   static address get_ic_miss_stub() {
 262     assert(_ic_miss_blob!= NULL, "oops");
 263     return _ic_miss_blob->entry_point();
 264   }
 265 
 266   static address get_handle_wrong_method_stub() {
 267     assert(_wrong_method_blob!= NULL, "oops");
 268     return _wrong_method_blob->entry_point();
 269   }
 270 
 271   static address get_handle_wrong_method_abstract_stub() {
 272     assert(_wrong_method_abstract_blob!= NULL, "oops");
 273     return _wrong_method_abstract_blob->entry_point();
 274   }
 275 
 276 #ifdef COMPILER2
 277   static void generate_uncommon_trap_blob(void);
 278   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
 279 #endif // COMPILER2
 280 
 281   static address get_resolve_opt_virtual_call_stub() {
 282     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
 283     return _resolve_opt_virtual_call_blob->entry_point();
 284   }
 285   static address get_resolve_virtual_call_stub() {
 286     assert(_resolve_virtual_call_blob != NULL, "oops");
 287     return _resolve_virtual_call_blob->entry_point();
 288   }
 289   static address get_resolve_static_call_stub() {
 290     assert(_resolve_static_call_blob != NULL, "oops");
 291     return _resolve_static_call_blob->entry_point();
 292   }
 293 
 294   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
 295   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
 296   static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }
 297 
 298   // Counters
 299 #ifndef PRODUCT
 300   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
 301 #endif // PRODUCT
 302 
 303   // Helper routine for full-speed JVMTI exception throwing support
 304   static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
 305   static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
 306 
 307   // RedefineClasses() tracing support for obsolete method entry
 308   static int rc_trace_method_entry(JavaThread* thread, Method* m);
 309 
 310   // To be used as the entry point for unresolved native methods.
 311   static address native_method_throw_unsatisfied_link_error_entry();
 312   static address native_method_throw_unsupported_operation_exception_entry();
 313 
 314   // bytecode tracing is only used by the TraceBytecodes
 315   static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
 316 
 317   static oop retrieve_receiver(Symbol* sig, frame caller);
 318 
 319   static void register_finalizer(JavaThread* thread, oopDesc* obj);
 320 
 321   // dtrace notifications
 322   static int dtrace_object_alloc(oopDesc* o, int size);
 323   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
 324   static int dtrace_method_entry(JavaThread* thread, Method* m);
 325   static int dtrace_method_exit(JavaThread* thread, Method* m);
 326 
 327   // Utility method for retrieving the Java thread id, returns 0 if the
 328   // thread is not a well formed Java thread.
 329   static jlong get_java_tid(Thread* thread);
 330 
 331 
 332   // used by native wrappers to reenable yellow if overflow happened in native code
 333   static void reguard_yellow_pages();
 334 
 335   // Fill in the "X cannot be cast to a Y" message for ClassCastException
 336   //
 337   // @param thr the current thread
 338   // @param name the name of the class of the object attempted to be cast
 339   // @return the dynamically allocated exception message (must be freed
 340   // by the caller using a resource mark)
 341   //
 342   // BCP must refer to the current 'checkcast' opcode for the frame
 343   // on top of the stack.
 344   // The caller (or one of it's callers) must use a ResourceMark
 345   // in order to correctly free the result.
 346   //
 347   static char* generate_class_cast_message(JavaThread* thr, const char* name);
 348 
 349   // Fill in the "X cannot be cast to a Y" message for ClassCastException
 350   //
 351   // @param name the name of the class of the object attempted to be cast
 352   // @param klass the name of the target klass attempt
 353   // @param gripe the specific kind of problem being reported
 354   // @return the dynamically allocated exception message (must be freed
 355   // by the caller using a resource mark)
 356   //
 357   // This version does not require access the frame, so it can be called
 358   // from interpreted code
 359   // The caller (or one of it's callers) must use a ResourceMark
 360   // in order to correctly free the result.
 361   //
 362   static char* generate_class_cast_message(const char* name, const char* klass,
 363                                            const char* gripe = " cannot be cast to ");
 364 
 365   // Resolves a call site- may patch in the destination of the call into the
 366   // compiled code.
 367   static methodHandle resolve_helper(JavaThread *thread,
 368                                      bool is_virtual,
 369                                      bool is_optimized, TRAPS);
 370 
 371  private:
 372   // deopt blob
 373   static void generate_deopt_blob(void);
 374 
 375  public:
 376   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
 377 
 378   // Resets a call-site in compiled code so it will get resolved again.
 379   static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
 380 
 381   // In the code prolog, if the klass comparison fails, the inline cache
 382   // misses and the call site is patched to megamorphic
 383   static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
 384 
 385   // Find the method that called us.
 386   static methodHandle find_callee_method(JavaThread* thread, TRAPS);
 387 
 388 
 389  private:
 390   static Handle find_callee_info(JavaThread* thread,
 391                                  Bytecodes::Code& bc,
 392                                  CallInfo& callinfo, TRAPS);
 393   static Handle find_callee_info_helper(JavaThread* thread,
 394                                         vframeStream& vfst,
 395                                         Bytecodes::Code& bc,
 396                                         CallInfo& callinfo, TRAPS);
 397 
 398   static methodHandle extract_attached_method(vframeStream& vfst);
 399 
 400   static address clean_virtual_call_entry();
 401   static address clean_opt_virtual_call_entry();
 402   static address clean_static_call_entry();
 403 
 404 #if defined(X86) && defined(COMPILER1)
 405   // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
 406   static void inline_check_hashcode_from_object_header(MacroAssembler* masm, methodHandle method, Register obj_reg, Register result);
 407 #endif // X86 && COMPILER1
 408 
 409  public:
 410 
 411   // Read the array of BasicTypes from a Java signature, and compute where
 412   // compiled Java code would like to put the results.  Values in reg_lo and
 413   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
 414   // registers, those above refer to 4-byte stack slots.  All stack slots are
 415   // based off of the window top.  SharedInfo::stack0 refers to the first usable
 416   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
 417   // 4-bytes higher. So for sparc because the register window save area is at
 418   // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
 419   // will be just above it. (
 420   // return value is the maximum number of VMReg stack slots the convention will use.
 421   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
 422 
 423   static void check_member_name_argument_is_last_argument(const methodHandle& method,
 424                                                           const BasicType* sig_bt,
 425                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
 426 
 427   // Ditto except for calling C
 428   //
 429   // C argument in register AND stack slot.
 430   // Some architectures require that an argument must be passed in a register
 431   // AND in a stack slot. These architectures provide a second VMRegPair array
 432   // to be filled by the c_calling_convention method. On other architectures,
 433   // NULL is being passed as the second VMRegPair array, so arguments are either
 434   // passed in a register OR in a stack slot.
 435   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
 436                                   int total_args_passed);
 437 
 438   // Compute the new number of arguments in the signature if 32 bit ints
 439   // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
 440   // is true.
 441   static int  convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
 442   // Adapt a method's signature if it contains 32 bit integers that must
 443   // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
 444   // is true.
 445   static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
 446                                        BasicType*& in_sig_bt, VMRegPair*& in_regs);
 447 
 448   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
 449   // blobs. Unlike adapters in the tiger and earlier releases the code in these
 450   // blobs does not create a new frame and are therefore virtually invisible
 451   // to the stack walking code. In general these blobs extend the callers stack
 452   // as needed for the conversion of argument locations.
 453 
 454   // When calling a c2i blob the code will always call the interpreter even if
 455   // by the time we reach the blob there is compiled code available. This allows
 456   // the blob to pass the incoming stack pointer (the sender sp) in a known
 457   // location for the interpreter to record. This is used by the frame code
 458   // to correct the sender code to match up with the stack pointer when the
 459   // thread left the compiled code. In addition it allows the interpreter
 460   // to remove the space the c2i adapter allocated to do its argument conversion.
 461 
 462   // Although a c2i blob will always run interpreted even if compiled code is
 463   // present if we see that compiled code is present the compiled call site
 464   // will be patched/re-resolved so that later calls will run compiled.
 465 
 466   // Additionally a c2i blob need to have a unverified entry because it can be reached
 467   // in situations where the call site is an inlined cache site and may go megamorphic.
 468 
 469   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
 470   // that the interpreter before it does any call dispatch will record the current
 471   // stack pointer in the interpreter frame. On return it will restore the stack
 472   // pointer as needed. This means the i2c adapter code doesn't need any special
 473   // handshaking path with compiled code to keep the stack walking correct.
 474 
 475   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
 476                                                       int comp_args_on_stack,
 477                                                       const GrowableArray<SigEntry>& sig_extended,
 478                                                       const VMRegPair *regs,
 479                                                       AdapterFingerPrint* fingerprint,
 480                                                       AdapterBlob*& new_adapter);
 481 
 482   static void gen_i2c_adapter(MacroAssembler *_masm,
 483                               int comp_args_on_stack,
 484                               const GrowableArray<SigEntry>& sig_extended,
 485                               const VMRegPair *regs);
 486 
 487   // OSR support
 488 
 489   // OSR_migration_begin will extract the jvm state from an interpreter
 490   // frame (locals, monitors) and store the data in a piece of C heap
 491   // storage. This then allows the interpreter frame to be removed from the
 492   // stack and the OSR nmethod to be called. That method is called with a
 493   // pointer to the C heap storage. This pointer is the return value from
 494   // OSR_migration_begin.
 495 
 496   static intptr_t* OSR_migration_begin(JavaThread *thread);
 497 
 498   // OSR_migration_end is a trivial routine. It is called after the compiled
 499   // method has extracted the jvm state from the C heap that OSR_migration_begin
 500   // created. It's entire job is to simply free this storage.
 501   static void OSR_migration_end(intptr_t* buf);
 502 
 503   // Convert a sig into a calling convention register layout
 504   // and find interesting things about it.
 505   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
 506   static VMReg name_for_receiver();
 507 
 508   // "Top of Stack" slots that may be unused by the calling convention but must
 509   // otherwise be preserved.
 510   // On Intel these are not necessary and the value can be zero.
 511   // On Sparc this describes the words reserved for storing a register window
 512   // when an interrupt occurs.
 513   static uint out_preserve_stack_slots();
 514 
 515   // Is vector's size (in bytes) bigger than a size saved by default?
 516   // For example, on x86 16 bytes XMM registers are saved by default.
 517   static bool is_wide_vector(int size);
 518 
 519   // Save and restore a native result
 520   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
 521   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
 522 
 523   // Generate a native wrapper for a given method.  The method takes arguments
 524   // in the Java compiled code convention, marshals them to the native
 525   // convention (handlizes oops, etc), transitions to native, makes the call,
 526   // returns to java state (possibly blocking), unhandlizes any result and
 527   // returns.
 528   //
 529   // The wrapper may contain special-case code if the given method
 530   // is a JNI critical method, or a compiled method handle adapter,
 531   // such as _invokeBasic, _linkToVirtual, etc.
 532   static nmethod* generate_native_wrapper(MacroAssembler* masm,
 533                                           const methodHandle& method,
 534                                           int compile_id,
 535                                           BasicType* sig_bt,
 536                                           VMRegPair* regs,
 537                                           BasicType ret_type);
 538 
 539   // Block before entering a JNI critical method
 540   static void block_for_jni_critical(JavaThread* thread);
 541 
 542   // A compiled caller has just called the interpreter, but compiled code
 543   // exists.  Patch the caller so he no longer calls into the interpreter.
 544   static void fixup_callers_callsite(Method* moop, address ret_pc);
 545   static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
 546 
 547   // Slow-path Locking and Unlocking
 548   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 549   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 550 
 551   // Resolving of calls
 552   static address resolve_static_call_C     (JavaThread *thread);
 553   static address resolve_virtual_call_C    (JavaThread *thread);
 554   static address resolve_opt_virtual_call_C(JavaThread *thread);
 555 
 556   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
 557   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
 558                                oopDesc* dest, jint dest_pos,
 559                                jint length, JavaThread* thread);
 560 
 561   // handle ic miss with caller being compiled code
 562   // wrong method handling (inline cache misses, zombie methods)
 563   static address handle_wrong_method(JavaThread* thread);
 564   static address handle_wrong_method_abstract(JavaThread* thread);
 565   static address handle_wrong_method_ic_miss(JavaThread* thread);
 566   static void allocate_value_types(JavaThread* thread, Method* callee);
 567   static void apply_post_barriers(JavaThread* thread, objArrayOopDesc* array, Method* callee_method);
 568 
 569 #ifndef PRODUCT
 570 
 571   // Collect and print inline cache miss statistics
 572  private:
 573   enum { maxICmiss_count = 100 };
 574   static int     _ICmiss_index;                  // length of IC miss histogram
 575   static int     _ICmiss_count[maxICmiss_count]; // miss counts
 576   static address _ICmiss_at[maxICmiss_count];    // miss addresses
 577   static void trace_ic_miss(address at);
 578 
 579  public:
 580   static int _throw_null_ctr;                    // throwing a null-pointer exception
 581   static int _ic_miss_ctr;                       // total # of IC misses
 582   static int _wrong_method_ctr;
 583   static int _resolve_static_ctr;
 584   static int _resolve_virtual_ctr;
 585   static int _resolve_opt_virtual_ctr;
 586   static int _implicit_null_throws;
 587   static int _implicit_div0_throws;
 588 
 589   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
 590   static int _jshort_array_copy_ctr;       // Slow-path short array copy
 591   static int _jint_array_copy_ctr;         // Slow-path int array copy
 592   static int _jlong_array_copy_ctr;        // Slow-path long array copy
 593   static int _oop_array_copy_ctr;          // Slow-path oop array copy
 594   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
 595   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
 596   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
 597   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
 598 
 599   static int _new_instance_ctr;            // 'new' object requires GC
 600   static int _new_array_ctr;               // 'new' array requires GC
 601   static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
 602   static int _find_handler_ctr;            // find exception handler
 603   static int _rethrow_ctr;                 // rethrow exception
 604   static int _mon_enter_stub_ctr;          // monitor enter stub
 605   static int _mon_exit_stub_ctr;           // monitor exit stub
 606   static int _mon_enter_ctr;               // monitor enter slow
 607   static int _mon_exit_ctr;                // monitor exit slow
 608   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
 609 
 610   // Statistics code
 611   // stats for "normal" compiled calls (non-interface)
 612   static int     _nof_normal_calls;              // total # of calls
 613   static int     _nof_optimized_calls;           // total # of statically-bound calls
 614   static int     _nof_inlined_calls;             // total # of inlined normal calls
 615   static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)
 616   static int     _nof_inlined_static_calls;      // total # of inlined static calls
 617   // stats for compiled interface calls
 618   static int     _nof_interface_calls;           // total # of compiled calls
 619   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
 620   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
 621   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
 622   // stats for runtime exceptions
 623   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
 624 
 625  public: // for compiler
 626   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
 627   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
 628   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
 629   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
 630   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
 631   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
 632   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
 633   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
 634   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
 635   static void print_call_statistics(int comp_total);
 636   static void print_statistics();
 637   static void print_ic_miss_histogram();
 638 
 639 #endif // PRODUCT
 640 };
 641 
 642 
 643 // ---------------------------------------------------------------------------
 644 // Implementation of AdapterHandlerLibrary
 645 //
 646 // This library manages argument marshaling adapters and native wrappers.
 647 // There are 2 flavors of adapters: I2C and C2I.
 648 //
 649 // The I2C flavor takes a stock interpreted call setup, marshals the
 650 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
 651 // code_begin().  It is broken to call it without an nmethod assigned.
 652 // The usual behavior is to lift any register arguments up out of the
 653 // stack and possibly re-pack the extra arguments to be contiguous.
 654 // I2C adapters will save what the interpreter's stack pointer will be
 655 // after arguments are popped, then adjust the interpreter's frame
 656 // size to force alignment and possibly to repack the arguments.
 657 // After re-packing, it jumps to the compiled code start.  There are
 658 // no safepoints in this adapter code and a GC cannot happen while
 659 // marshaling is in progress.
 660 //
 661 // The C2I flavor takes a stock compiled call setup plus the target method in
 662 // Rmethod, marshals the arguments for an interpreted call and jumps to
 663 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
 664 // setup.  Compiled frames are fixed-size and the args are likely not in the
 665 // right place.  Hence all the args will likely be copied into the
 666 // interpreter's frame, forcing that frame to grow.  The compiled frame's
 667 // outgoing stack args will be dead after the copy.
 668 //
 669 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
 670 // also perform an official frame push & pop.  They have a call to the native
 671 // routine in their middles and end in a return (instead of ending in a jump).
 672 // The native wrappers are stored in real nmethods instead of the BufferBlobs
 673 // used by the adapters.  The code generation happens here because it's very
 674 // similar to what the adapters have to do.
 675 
 676 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
 677   friend class AdapterHandlerTable;
 678 
 679  private:
 680   AdapterFingerPrint* _fingerprint;
 681   address _i2c_entry;
 682   address _c2i_entry;
 683   address _c2i_unverified_entry;
 684   Symbol* _sig_extended;
 685 
 686 #ifdef ASSERT
 687   // Captures code and signature used to generate this adapter when
 688   // verifying adapter equivalence.
 689   unsigned char* _saved_code;
 690   int            _saved_code_length;
 691 #endif
 692 
 693   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, Symbol* sig_extended) {
 694     _fingerprint = fingerprint;
 695     _i2c_entry = i2c_entry;
 696     _c2i_entry = c2i_entry;
 697     _c2i_unverified_entry = c2i_unverified_entry;
 698     _sig_extended = sig_extended;
 699 #ifdef ASSERT
 700     _saved_code = NULL;
 701     _saved_code_length = 0;
 702 #endif
 703   }
 704 
 705   void deallocate();
 706 
 707   // should never be used
 708   AdapterHandlerEntry();
 709 
 710  public:
 711   address get_i2c_entry()            const { return _i2c_entry; }
 712   address get_c2i_entry()            const { return _c2i_entry; }
 713   address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
 714   Symbol* get_sig_extended()         const { return _sig_extended; }
 715   address base_address();
 716   void relocate(address new_base);
 717 
 718   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
 719 
 720   AdapterHandlerEntry* next() {
 721     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
 722   }
 723 
 724 #ifdef ASSERT
 725   // Used to verify that code generated for shared adapters is equivalent
 726   void save_code   (unsigned char* code, int length);
 727   bool compare_code(unsigned char* code, int length);
 728 #endif
 729 
 730   //virtual void print_on(outputStream* st) const;  DO NOT USE
 731   void print_adapter_on(outputStream* st) const;
 732 };
 733 
 734 class AdapterHandlerLibrary: public AllStatic {
 735  private:
 736   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
 737   static AdapterHandlerTable* _adapters;
 738   static AdapterHandlerEntry* _abstract_method_handler;
 739   static BufferBlob* buffer_blob();
 740   static void initialize();
 741 
 742  public:
 743 
 744   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
 745                                         address i2c_entry, address c2i_entry, address c2i_unverified_entry,
 746                                         Symbol* sig_extended = NULL);
 747   static void create_native_wrapper(const methodHandle& method);
 748   static AdapterHandlerEntry* get_adapter(const methodHandle& method);
 749 
 750   static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
 751   static void print_handler_on(outputStream* st, const CodeBlob* b);
 752   static bool contains(const CodeBlob* b);
 753 #ifndef PRODUCT
 754   static void print_statistics();
 755 #endif // PRODUCT
 756 
 757 };
 758 
 759 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP