1 /*
   2  * Copyright (c) 1997, 2016, 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 // 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 
  47 class 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   static address             _resolve_static_call_entry;
  64 
  65   static DeoptimizationBlob* _deopt_blob;
  66 
  67   static SafepointBlob*      _polling_page_vectors_safepoint_handler_blob;
  68   static SafepointBlob*      _polling_page_safepoint_handler_blob;
  69   static SafepointBlob*      _polling_page_return_handler_blob;
  70 
  71 #ifdef COMPILER2
  72   static UncommonTrapBlob*   _uncommon_trap_blob;
  73 #endif // COMPILER2
  74 
  75 #ifndef PRODUCT
  76   // Counters
  77   static int     _nof_megamorphic_calls;         // total # of megamorphic calls (through vtable)
  78 #endif // !PRODUCT
  79 
  80  private:
  81   enum { POLL_AT_RETURN,  POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
  82   static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
  83   static RuntimeStub*   generate_resolve_blob(address destination, const char* name);
  84   static RuntimeStub*   generate_return_value_blob(address destination, const char* name);
  85  public:
  86   static void generate_stubs(void);
  87 
  88   // max bytes for each dtrace string parameter
  89   enum { max_dtrace_string_size = 256 };
  90 
  91   // The following arithmetic routines are used on platforms that do
  92   // not have machine instructions to implement their functionality.
  93   // Do not remove these.
  94 
  95   // long arithmetics
  96   static jlong   lmul(jlong y, jlong x);
  97   static jlong   ldiv(jlong y, jlong x);
  98   static jlong   lrem(jlong y, jlong x);
  99 
 100   // float and double remainder
 101   static jfloat  frem(jfloat  x, jfloat  y);
 102   static jdouble drem(jdouble x, jdouble y);
 103 
 104 
 105 #ifdef _WIN64
 106   // Workaround for fmod issue in the Windows x64 CRT
 107   static double fmod_winx64(double x, double y);
 108 #endif
 109 
 110 #ifdef __SOFTFP__
 111   static jfloat  fadd(jfloat x, jfloat y);
 112   static jfloat  fsub(jfloat x, jfloat y);
 113   static jfloat  fmul(jfloat x, jfloat y);
 114   static jfloat  fdiv(jfloat x, jfloat y);
 115 
 116   static jdouble dadd(jdouble x, jdouble y);
 117   static jdouble dsub(jdouble x, jdouble y);
 118   static jdouble dmul(jdouble x, jdouble y);
 119   static jdouble ddiv(jdouble x, jdouble y);
 120 #endif // __SOFTFP__
 121 
 122   // float conversion (needs to set appropriate rounding mode)
 123   static jint    f2i (jfloat  x);
 124   static jlong   f2l (jfloat  x);
 125   static jint    d2i (jdouble x);
 126   static jlong   d2l (jdouble x);
 127   static jfloat  d2f (jdouble x);
 128   static jfloat  l2f (jlong   x);
 129   static jdouble l2d (jlong   x);
 130 
 131 #ifdef __SOFTFP__
 132   static jfloat  i2f (jint    x);
 133   static jdouble i2d (jint    x);
 134   static jdouble f2d (jfloat  x);
 135 #endif // __SOFTFP__
 136 
 137   // double trigonometrics and transcendentals
 138   static jdouble dsin(jdouble x);
 139   static jdouble dcos(jdouble x);
 140   static jdouble dtan(jdouble x);
 141   static jdouble dlog(jdouble x);
 142   static jdouble dlog10(jdouble x);
 143   static jdouble dexp(jdouble x);
 144   static jdouble dpow(jdouble x, jdouble y);
 145 
 146 #if defined(__SOFTFP__) || defined(E500V2)
 147   static double dabs(double f);
 148 #endif
 149 
 150 #if defined(__SOFTFP__) || defined(PPC)
 151   static double dsqrt(double f);
 152 #endif
 153 
 154   // Montgomery multiplication
 155   static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
 156                                   jint len, jlong inv, jint *m_ints);
 157   static void montgomery_square(jint *a_ints, jint *n_ints,
 158                                 jint len, jlong inv, jint *m_ints);
 159 
 160 #ifdef __SOFTFP__
 161   // C++ compiler generates soft float instructions as well as passing
 162   // float and double in registers.
 163   static int  fcmpl(float x, float y);
 164   static int  fcmpg(float x, float y);
 165   static int  dcmpl(double x, double y);
 166   static int  dcmpg(double x, double y);
 167 
 168   static int unordered_fcmplt(float x, float y);
 169   static int unordered_dcmplt(double x, double y);
 170   static int unordered_fcmple(float x, float y);
 171   static int unordered_dcmple(double x, double y);
 172   static int unordered_fcmpge(float x, float y);
 173   static int unordered_dcmpge(double x, double y);
 174   static int unordered_fcmpgt(float x, float y);
 175   static int unordered_dcmpgt(double x, double y);
 176 
 177   static float  fneg(float f);
 178   static double dneg(double f);
 179 #endif
 180 
 181   // exception handling across interpreter/compiler boundaries
 182   static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
 183   static address exception_handler_for_return_address(JavaThread* thread, address return_address);
 184 
 185 #if INCLUDE_ALL_GCS
 186   // G1 write barriers
 187   static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
 188   static void g1_wb_post(void* card_addr, JavaThread* thread);
 189 #endif // INCLUDE_ALL_GCS
 190 
 191   // exception handling and implicit exceptions
 192   static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
 193                                               bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
 194   enum ImplicitExceptionKind {
 195     IMPLICIT_NULL,
 196     IMPLICIT_DIVIDE_BY_ZERO,
 197     STACK_OVERFLOW
 198   };
 199   static void    throw_AbstractMethodError(JavaThread* thread);
 200   static void    throw_IncompatibleClassChangeError(JavaThread* thread);
 201   static void    throw_ArithmeticException(JavaThread* thread);
 202   static void    throw_NullPointerException(JavaThread* thread);
 203   static void    throw_NullPointerException_at_call(JavaThread* thread);
 204   static void    throw_StackOverflowError(JavaThread* thread);
 205   static void    throw_delayed_StackOverflowError(JavaThread* thread);
 206   static void    throw_StackOverflowError_common(JavaThread* thread, bool delayed);
 207   static address continuation_for_implicit_exception(JavaThread* thread,
 208                                                      address faulting_pc,
 209                                                      ImplicitExceptionKind exception_kind);
 210 #if INCLUDE_JVMCI
 211   static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason);
 212 #endif
 213 
 214   static void enable_stack_reserved_zone(JavaThread* thread);
 215   static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
 216 
 217   // Shared stub locations
 218   static address get_poll_stub(address pc);
 219 
 220   static address get_ic_miss_stub() {
 221     assert(_ic_miss_blob!= NULL, "oops");
 222     return _ic_miss_blob->entry_point();
 223   }
 224 
 225   static address get_handle_wrong_method_stub() {
 226     assert(_wrong_method_blob!= NULL, "oops");
 227     return _wrong_method_blob->entry_point();
 228   }
 229 
 230   static address get_handle_wrong_method_abstract_stub() {
 231     assert(_wrong_method_abstract_blob!= NULL, "oops");
 232     return _wrong_method_abstract_blob->entry_point();
 233   }
 234 
 235 #ifdef COMPILER2
 236   static void generate_uncommon_trap_blob(void);
 237   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
 238 #endif // COMPILER2
 239 
 240   static address get_resolve_opt_virtual_call_stub() {
 241     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
 242     return _resolve_opt_virtual_call_blob->entry_point();
 243   }
 244   static address get_resolve_virtual_call_stub() {
 245     assert(_resolve_virtual_call_blob != NULL, "oops");
 246     return _resolve_virtual_call_blob->entry_point();
 247   }
 248   static address get_resolve_static_call_stub() {
 249     assert(_resolve_static_call_blob != NULL, "oops");
 250     return _resolve_static_call_blob->entry_point();
 251   }
 252 
 253   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
 254   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
 255   static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }
 256 
 257   // Counters
 258 #ifndef PRODUCT
 259   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
 260 #endif // PRODUCT
 261 
 262   // Helper routine for full-speed JVMTI exception throwing support
 263   static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
 264   static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
 265 
 266   // RedefineClasses() tracing support for obsolete method entry
 267   static int rc_trace_method_entry(JavaThread* thread, Method* m);
 268 
 269   // To be used as the entry point for unresolved native methods.
 270   static address native_method_throw_unsatisfied_link_error_entry();
 271   static address native_method_throw_unsupported_operation_exception_entry();
 272 
 273   static oop retrieve_receiver(Symbol* sig, frame caller);
 274 
 275   static void register_finalizer(JavaThread* thread, oopDesc* obj);
 276 
 277   // dtrace notifications
 278   static int dtrace_object_alloc(oopDesc* o, int size);
 279   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
 280   static int dtrace_method_entry(JavaThread* thread, Method* m);
 281   static int dtrace_method_exit(JavaThread* thread, Method* m);
 282 
 283   // Utility method for retrieving the Java thread id, returns 0 if the
 284   // thread is not a well formed Java thread.
 285   static jlong get_java_tid(Thread* thread);
 286 
 287 
 288   // used by native wrappers to reenable yellow if overflow happened in native code
 289   static void reguard_yellow_pages();
 290 
 291   // Fill in the "X cannot be cast to a Y" message for ClassCastException
 292   //
 293   // @param thr the current thread
 294   // @param caster_klass the class of the object we are casting
 295   // @return the dynamically allocated exception message (must be freed
 296   // by the caller using a resource mark)
 297   //
 298   // BCP must refer to the current 'checkcast' opcode for the frame
 299   // on top of the stack.
 300   // The caller (or one of its callers) must use a ResourceMark
 301   // in order to correctly free the result.
 302   //
 303   static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
 304 
 305   // Fill in the "X cannot be cast to a Y" message for ClassCastException
 306   //
 307   // @param caster_klass the class of the object we are casting
 308   // @param target_klass the target klass attempt
 309   // @return the dynamically allocated exception message (must be freed
 310   // by the caller using a resource mark)
 311   //
 312   // This version does not require access the frame, so it can be called
 313   // from interpreted code
 314   // The caller (or one of it's callers) must use a ResourceMark
 315   // in order to correctly free the result.
 316   //
 317   static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass);
 318 
 319   // Resolves a call site- may patch in the destination of the call into the
 320   // compiled code.
 321   static methodHandle resolve_helper(JavaThread *thread,
 322                                      bool is_virtual,
 323                                      bool is_optimized, TRAPS);
 324 
 325  private:
 326   // deopt blob
 327   static void generate_deopt_blob(void);
 328 
 329  public:
 330   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
 331 
 332   // Resets a call-site in compiled code so it will get resolved again.
 333   static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
 334 
 335   // In the code prolog, if the klass comparison fails, the inline cache
 336   // misses and the call site is patched to megamorphic
 337   static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
 338 
 339   // Find the method that called us.
 340   static methodHandle find_callee_method(JavaThread* thread, TRAPS);
 341 
 342 
 343  private:
 344   static Handle find_callee_info(JavaThread* thread,
 345                                  Bytecodes::Code& bc,
 346                                  CallInfo& callinfo, TRAPS);
 347   static Handle find_callee_info_helper(JavaThread* thread,
 348                                         vframeStream& vfst,
 349                                         Bytecodes::Code& bc,
 350                                         CallInfo& callinfo, TRAPS);
 351 
 352   static methodHandle extract_attached_method(vframeStream& vfst);
 353 
 354   static address clean_virtual_call_entry();
 355   static address clean_opt_virtual_call_entry();
 356   static address clean_static_call_entry();
 357 
 358 #if defined(X86) && defined(COMPILER1)
 359   // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
 360   static void inline_check_hashcode_from_object_header(MacroAssembler* masm, methodHandle method, Register obj_reg, Register result);
 361 #endif // X86 && COMPILER1
 362 
 363  public:
 364 
 365   // Read the array of BasicTypes from a Java signature, and compute where
 366   // compiled Java code would like to put the results.  Values in reg_lo and
 367   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
 368   // registers, those above refer to 4-byte stack slots.  All stack slots are
 369   // based off of the window top.  SharedInfo::stack0 refers to the first usable
 370   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
 371   // 4-bytes higher. So for sparc because the register window save area is at
 372   // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
 373   // will be just above it. (
 374   // return value is the maximum number of VMReg stack slots the convention will use.
 375   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
 376   static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
 377   static const uint java_return_convention_max_int;
 378   static const uint java_return_convention_max_float;
 379 
 380   static void check_member_name_argument_is_last_argument(const methodHandle& method,
 381                                                           const BasicType* sig_bt,
 382                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
 383 
 384   // Ditto except for calling C
 385   //
 386   // C argument in register AND stack slot.
 387   // Some architectures require that an argument must be passed in a register
 388   // AND in a stack slot. These architectures provide a second VMRegPair array
 389   // to be filled by the c_calling_convention method. On other architectures,
 390   // NULL is being passed as the second VMRegPair array, so arguments are either
 391   // passed in a register OR in a stack slot.
 392   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
 393                                   int total_args_passed);
 394 
 395   static size_t trampoline_size();
 396 
 397   static void generate_trampoline(MacroAssembler *masm, address destination);
 398 
 399   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
 400   // blobs. Unlike adapters in the tiger and earlier releases the code in these
 401   // blobs does not create a new frame and are therefore virtually invisible
 402   // to the stack walking code. In general these blobs extend the callers stack
 403   // as needed for the conversion of argument locations.
 404 
 405   // When calling a c2i blob the code will always call the interpreter even if
 406   // by the time we reach the blob there is compiled code available. This allows
 407   // the blob to pass the incoming stack pointer (the sender sp) in a known
 408   // location for the interpreter to record. This is used by the frame code
 409   // to correct the sender code to match up with the stack pointer when the
 410   // thread left the compiled code. In addition it allows the interpreter
 411   // to remove the space the c2i adapter allocated to do its argument conversion.
 412 
 413   // Although a c2i blob will always run interpreted even if compiled code is
 414   // present if we see that compiled code is present the compiled call site
 415   // will be patched/re-resolved so that later calls will run compiled.
 416 
 417   // Additionally a c2i blob need to have a unverified entry because it can be reached
 418   // in situations where the call site is an inlined cache site and may go megamorphic.
 419 
 420   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
 421   // that the interpreter before it does any call dispatch will record the current
 422   // stack pointer in the interpreter frame. On return it will restore the stack
 423   // pointer as needed. This means the i2c adapter code doesn't need any special
 424   // handshaking path with compiled code to keep the stack walking correct.
 425 
 426   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm,
 427                                                       int comp_args_on_stack,
 428                                                       const GrowableArray<SigEntry>& sig_extended,
 429                                                       const VMRegPair *regs,
 430                                                       AdapterFingerPrint* fingerprint,
 431                                                       AdapterBlob*& new_adapter);
 432 
 433   static void gen_i2c_adapter(MacroAssembler *_masm,
 434                               int comp_args_on_stack,
 435                               const GrowableArray<SigEntry>& sig_extended,
 436                               const VMRegPair *regs);
 437 
 438   // OSR support
 439 
 440   // OSR_migration_begin will extract the jvm state from an interpreter
 441   // frame (locals, monitors) and store the data in a piece of C heap
 442   // storage. This then allows the interpreter frame to be removed from the
 443   // stack and the OSR nmethod to be called. That method is called with a
 444   // pointer to the C heap storage. This pointer is the return value from
 445   // OSR_migration_begin.
 446 
 447   static intptr_t* OSR_migration_begin(JavaThread *thread);
 448 
 449   // OSR_migration_end is a trivial routine. It is called after the compiled
 450   // method has extracted the jvm state from the C heap that OSR_migration_begin
 451   // created. It's entire job is to simply free this storage.
 452   static void OSR_migration_end(intptr_t* buf);
 453 
 454   // Convert a sig into a calling convention register layout
 455   // and find interesting things about it.
 456   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
 457   static VMReg name_for_receiver();
 458 
 459   // "Top of Stack" slots that may be unused by the calling convention but must
 460   // otherwise be preserved.
 461   // On Intel these are not necessary and the value can be zero.
 462   // On Sparc this describes the words reserved for storing a register window
 463   // when an interrupt occurs.
 464   static uint out_preserve_stack_slots();
 465 
 466   // Is vector's size (in bytes) bigger than a size saved by default?
 467   // For example, on x86 16 bytes XMM registers are saved by default.
 468   static bool is_wide_vector(int size);
 469 
 470   // Save and restore a native result
 471   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
 472   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
 473 
 474   // Generate a native wrapper for a given method.  The method takes arguments
 475   // in the Java compiled code convention, marshals them to the native
 476   // convention (handlizes oops, etc), transitions to native, makes the call,
 477   // returns to java state (possibly blocking), unhandlizes any result and
 478   // returns.
 479   //
 480   // The wrapper may contain special-case code if the given method
 481   // is a JNI critical method, or a compiled method handle adapter,
 482   // such as _invokeBasic, _linkToVirtual, etc.
 483   static nmethod* generate_native_wrapper(MacroAssembler* masm,
 484                                           const methodHandle& method,
 485                                           int compile_id,
 486                                           BasicType* sig_bt,
 487                                           VMRegPair* regs,
 488                                           BasicType ret_type);
 489 
 490   // Block before entering a JNI critical method
 491   static void block_for_jni_critical(JavaThread* thread);
 492 
 493   // A compiled caller has just called the interpreter, but compiled code
 494   // exists.  Patch the caller so he no longer calls into the interpreter.
 495   static void fixup_callers_callsite(Method* moop, address ret_pc);
 496   static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
 497 
 498   // Slow-path Locking and Unlocking
 499   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 500   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 501 
 502   // Resolving of calls
 503   static address resolve_static_call_C     (JavaThread *thread);
 504   static address resolve_virtual_call_C    (JavaThread *thread);
 505   static address resolve_opt_virtual_call_C(JavaThread *thread);
 506 
 507   static void load_value_type_fields_in_regs(JavaThread *thread, oopDesc* res);
 508   static void store_value_type_fields_to_buf(JavaThread *thread, intptr_t res);
 509 
 510   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
 511   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
 512                                oopDesc* dest, jint dest_pos,
 513                                jint length, JavaThread* thread);
 514 
 515   // handle ic miss with caller being compiled code
 516   // wrong method handling (inline cache misses, zombie methods)
 517   static address handle_wrong_method(JavaThread* thread);
 518   static address handle_wrong_method_abstract(JavaThread* thread);
 519   static address handle_wrong_method_ic_miss(JavaThread* thread);
 520   static void allocate_value_types(JavaThread* thread, Method* callee);
 521   static void apply_post_barriers(JavaThread* thread, objArrayOopDesc* array);
 522 
 523   static address handle_unsafe_access(JavaThread* thread, address next_pc);
 524 
 525 #ifndef PRODUCT
 526 
 527   // Collect and print inline cache miss statistics
 528  private:
 529   enum { maxICmiss_count = 100 };
 530   static int     _ICmiss_index;                  // length of IC miss histogram
 531   static int     _ICmiss_count[maxICmiss_count]; // miss counts
 532   static address _ICmiss_at[maxICmiss_count];    // miss addresses
 533   static void trace_ic_miss(address at);
 534 
 535  public:
 536   static int _throw_null_ctr;                    // throwing a null-pointer exception
 537   static int _ic_miss_ctr;                       // total # of IC misses
 538   static int _wrong_method_ctr;
 539   static int _resolve_static_ctr;
 540   static int _resolve_virtual_ctr;
 541   static int _resolve_opt_virtual_ctr;
 542   static int _implicit_null_throws;
 543   static int _implicit_div0_throws;
 544 
 545   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
 546   static int _jshort_array_copy_ctr;       // Slow-path short array copy
 547   static int _jint_array_copy_ctr;         // Slow-path int array copy
 548   static int _jlong_array_copy_ctr;        // Slow-path long array copy
 549   static int _oop_array_copy_ctr;          // Slow-path oop array copy
 550   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
 551   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
 552   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
 553   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
 554 
 555   static int _new_instance_ctr;            // 'new' object requires GC
 556   static int _new_array_ctr;               // 'new' array requires GC
 557   static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
 558   static int _find_handler_ctr;            // find exception handler
 559   static int _rethrow_ctr;                 // rethrow exception
 560   static int _mon_enter_stub_ctr;          // monitor enter stub
 561   static int _mon_exit_stub_ctr;           // monitor exit stub
 562   static int _mon_enter_ctr;               // monitor enter slow
 563   static int _mon_exit_ctr;                // monitor exit slow
 564   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
 565 
 566   // Statistics code
 567   // stats for "normal" compiled calls (non-interface)
 568   static int     _nof_normal_calls;              // total # of calls
 569   static int     _nof_optimized_calls;           // total # of statically-bound calls
 570   static int     _nof_inlined_calls;             // total # of inlined normal calls
 571   static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)
 572   static int     _nof_inlined_static_calls;      // total # of inlined static calls
 573   // stats for compiled interface calls
 574   static int     _nof_interface_calls;           // total # of compiled calls
 575   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
 576   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
 577   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
 578   // stats for runtime exceptions
 579   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
 580 
 581  public: // for compiler
 582   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
 583   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
 584   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
 585   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
 586   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
 587   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
 588   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
 589   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
 590   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
 591   static void print_call_statistics(int comp_total);
 592   static void print_statistics();
 593   static void print_ic_miss_histogram();
 594 
 595 #endif // PRODUCT
 596 };
 597 
 598 
 599 // ---------------------------------------------------------------------------
 600 // Implementation of AdapterHandlerLibrary
 601 //
 602 // This library manages argument marshaling adapters and native wrappers.
 603 // There are 2 flavors of adapters: I2C and C2I.
 604 //
 605 // The I2C flavor takes a stock interpreted call setup, marshals the
 606 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
 607 // code_begin().  It is broken to call it without an nmethod assigned.
 608 // The usual behavior is to lift any register arguments up out of the
 609 // stack and possibly re-pack the extra arguments to be contiguous.
 610 // I2C adapters will save what the interpreter's stack pointer will be
 611 // after arguments are popped, then adjust the interpreter's frame
 612 // size to force alignment and possibly to repack the arguments.
 613 // After re-packing, it jumps to the compiled code start.  There are
 614 // no safepoints in this adapter code and a GC cannot happen while
 615 // marshaling is in progress.
 616 //
 617 // The C2I flavor takes a stock compiled call setup plus the target method in
 618 // Rmethod, marshals the arguments for an interpreted call and jumps to
 619 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
 620 // setup.  Compiled frames are fixed-size and the args are likely not in the
 621 // right place.  Hence all the args will likely be copied into the
 622 // interpreter's frame, forcing that frame to grow.  The compiled frame's
 623 // outgoing stack args will be dead after the copy.
 624 //
 625 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
 626 // also perform an official frame push & pop.  They have a call to the native
 627 // routine in their middles and end in a return (instead of ending in a jump).
 628 // The native wrappers are stored in real nmethods instead of the BufferBlobs
 629 // used by the adapters.  The code generation happens here because it's very
 630 // similar to what the adapters have to do.
 631 
 632 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
 633   friend class AdapterHandlerTable;
 634 
 635  private:
 636   AdapterFingerPrint* _fingerprint;
 637   address _i2c_entry;
 638   address _c2i_entry;
 639   address _c2i_unverified_entry;
 640   Symbol* _sig_extended;
 641 
 642 #ifdef ASSERT
 643   // Captures code and signature used to generate this adapter when
 644   // verifying adapter equivalence.
 645   unsigned char* _saved_code;
 646   int            _saved_code_length;
 647 #endif
 648 
 649   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, Symbol* sig_extended) {
 650     _fingerprint = fingerprint;
 651     _i2c_entry = i2c_entry;
 652     _c2i_entry = c2i_entry;
 653     _c2i_unverified_entry = c2i_unverified_entry;
 654     _sig_extended = sig_extended;
 655 #ifdef ASSERT
 656     _saved_code = NULL;
 657     _saved_code_length = 0;
 658 #endif
 659   }
 660 
 661   void deallocate();
 662 
 663   // should never be used
 664   AdapterHandlerEntry();
 665 
 666  public:
 667   address get_i2c_entry()            const { return _i2c_entry; }
 668   address get_c2i_entry()            const { return _c2i_entry; }
 669   address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
 670   Symbol* get_sig_extended()         const { return _sig_extended; }
 671   address base_address();
 672   void relocate(address new_base);
 673 
 674   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
 675 
 676   AdapterHandlerEntry* next() {
 677     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
 678   }
 679 
 680 #ifdef ASSERT
 681   // Used to verify that code generated for shared adapters is equivalent
 682   void save_code   (unsigned char* code, int length);
 683   bool compare_code(unsigned char* code, int length);
 684 #endif
 685 
 686   //virtual void print_on(outputStream* st) const;  DO NOT USE
 687   void print_adapter_on(outputStream* st) const;
 688 };
 689 
 690 // This class is used only with DumpSharedSpaces==true. It holds extra information
 691 // that's used only during CDS dump time.
 692 // For details, see comments around Method::link_method()
 693 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
 694   address               _c2i_entry_trampoline;   // allocated from shared spaces "MC" region
 695   AdapterHandlerEntry** _adapter_trampoline;     // allocated from shared spaces "MD" region
 696 
 697 public:
 698   address get_c2i_entry_trampoline()             const { return _c2i_entry_trampoline; }
 699   AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
 700   void init() NOT_CDS_RETURN;
 701 };
 702 
 703 
 704 class AdapterHandlerLibrary: public AllStatic {
 705  private:
 706   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
 707   static AdapterHandlerTable* _adapters;
 708   static AdapterHandlerEntry* _abstract_method_handler;
 709   static BufferBlob* buffer_blob();
 710   static void initialize();
 711   static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
 712 
 713  public:
 714 
 715   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
 716                                         address i2c_entry, address c2i_entry, address c2i_unverified_entry,
 717                                         Symbol* sig_extended = NULL);
 718   static void create_native_wrapper(const methodHandle& method);
 719   static AdapterHandlerEntry* get_adapter(const methodHandle& method);
 720 
 721   static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
 722   static void print_handler_on(outputStream* st, const CodeBlob* b);
 723   static bool contains(const CodeBlob* b);
 724 #ifndef PRODUCT
 725   static void print_statistics();
 726 #endif // PRODUCT
 727 
 728 };
 729 
 730 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP