1 /*
   2  * Copyright (c) 1997, 2019, 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_RUNTIME_SHAREDRUNTIME_HPP
  26 #define SHARE_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 bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
  52                                           CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
  53                                           Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
  54   static methodHandle resolve_sub_helper(JavaThread *thread,
  55                                          bool is_virtual,
  56                                          bool is_optimized, TRAPS);
  57 
  58   // Shared stub locations
  59 
  60   static RuntimeStub*        _wrong_method_blob;
  61   static RuntimeStub*        _wrong_method_abstract_blob;
  62   static RuntimeStub*        _ic_miss_blob;
  63   static RuntimeStub*        _resolve_opt_virtual_call_blob;
  64   static RuntimeStub*        _resolve_virtual_call_blob;
  65   static RuntimeStub*        _resolve_static_call_blob;
  66   static address             _resolve_static_call_entry;
  67 
  68   static DeoptimizationBlob* _deopt_blob;
  69 
  70   static SafepointBlob*      _polling_page_vectors_safepoint_handler_blob;
  71   static SafepointBlob*      _polling_page_safepoint_handler_blob;
  72   static SafepointBlob*      _polling_page_return_handler_blob;
  73 
  74 #ifdef COMPILER2
  75   static UncommonTrapBlob*   _uncommon_trap_blob;
  76 #endif // COMPILER2
  77 
  78 #ifndef PRODUCT
  79   // Counters
  80   static int     _nof_megamorphic_calls;         // total # of megamorphic calls (through vtable)
  81 #endif // !PRODUCT
  82 
  83  private:
  84   enum { POLL_AT_RETURN,  POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
  85   static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
  86   static RuntimeStub*   generate_resolve_blob(address destination, const char* name);
  87 
  88  public:
  89   static void generate_stubs(void);
  90 
  91   // max bytes for each dtrace string parameter
  92   enum { max_dtrace_string_size = 256 };
  93 
  94   // The following arithmetic routines are used on platforms that do
  95   // not have machine instructions to implement their functionality.
  96   // Do not remove these.
  97 
  98   // long arithmetics
  99   static jlong   lmul(jlong y, jlong x);
 100   static jlong   ldiv(jlong y, jlong x);
 101   static jlong   lrem(jlong y, jlong x);
 102 
 103   // float and double remainder
 104   static jfloat  frem(jfloat  x, jfloat  y);
 105   static jdouble drem(jdouble x, jdouble y);
 106 
 107 
 108 #ifdef _WIN64
 109   // Workaround for fmod issue in the Windows x64 CRT
 110   static double fmod_winx64(double x, double y);
 111 #endif
 112 
 113 #ifdef __SOFTFP__
 114   static jfloat  fadd(jfloat x, jfloat y);
 115   static jfloat  fsub(jfloat x, jfloat y);
 116   static jfloat  fmul(jfloat x, jfloat y);
 117   static jfloat  fdiv(jfloat x, jfloat y);
 118 
 119   static jdouble dadd(jdouble x, jdouble y);
 120   static jdouble dsub(jdouble x, jdouble y);
 121   static jdouble dmul(jdouble x, jdouble y);
 122   static jdouble ddiv(jdouble x, jdouble y);
 123 #endif // __SOFTFP__
 124 
 125   // float conversion (needs to set appropriate rounding mode)
 126   static jint    f2i (jfloat  x);
 127   static jlong   f2l (jfloat  x);
 128   static jint    d2i (jdouble x);
 129   static jlong   d2l (jdouble x);
 130   static jfloat  d2f (jdouble x);
 131   static jfloat  l2f (jlong   x);
 132   static jdouble l2d (jlong   x);
 133 
 134 #ifdef __SOFTFP__
 135   static jfloat  i2f (jint    x);
 136   static jdouble i2d (jint    x);
 137   static jdouble f2d (jfloat  x);
 138 #endif // __SOFTFP__
 139 
 140   // double trigonometrics and transcendentals
 141   static jdouble dsin(jdouble x);
 142   static jdouble dcos(jdouble x);
 143   static jdouble dtan(jdouble x);
 144   static jdouble dlog(jdouble x);
 145   static jdouble dlog10(jdouble x);
 146   static jdouble dexp(jdouble x);
 147   static jdouble dpow(jdouble x, jdouble y);
 148 
 149 #if defined(__SOFTFP__) || defined(E500V2)
 150   static double dabs(double f);
 151 #endif
 152 
 153 #if defined(__SOFTFP__) || defined(PPC)
 154   static double dsqrt(double f);
 155 #endif
 156 
 157   // Montgomery multiplication
 158   static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
 159                                   jint len, jlong inv, jint *m_ints);
 160   static void montgomery_square(jint *a_ints, jint *n_ints,
 161                                 jint len, jlong inv, jint *m_ints);
 162 
 163 #ifdef __SOFTFP__
 164   // C++ compiler generates soft float instructions as well as passing
 165   // float and double in registers.
 166   static int  fcmpl(float x, float y);
 167   static int  fcmpg(float x, float y);
 168   static int  dcmpl(double x, double y);
 169   static int  dcmpg(double x, double y);
 170 
 171   static int unordered_fcmplt(float x, float y);
 172   static int unordered_dcmplt(double x, double y);
 173   static int unordered_fcmple(float x, float y);
 174   static int unordered_dcmple(double x, double y);
 175   static int unordered_fcmpge(float x, float y);
 176   static int unordered_dcmpge(double x, double y);
 177   static int unordered_fcmpgt(float x, float y);
 178   static int unordered_dcmpgt(double x, double y);
 179 
 180   static float  fneg(float f);
 181   static double dneg(double f);
 182 #endif
 183 
 184   // exception handling across interpreter/compiler boundaries
 185   static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
 186   static address exception_handler_for_return_address(JavaThread* thread, address return_address);
 187 
 188   // exception handling and implicit exceptions
 189   static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
 190                                               bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
 191   enum ImplicitExceptionKind {
 192     IMPLICIT_NULL,
 193     IMPLICIT_DIVIDE_BY_ZERO,
 194     STACK_OVERFLOW
 195   };
 196   static void    throw_AbstractMethodError(JavaThread* thread);
 197   static void    throw_IncompatibleClassChangeError(JavaThread* thread);
 198   static void    throw_ArithmeticException(JavaThread* thread);
 199   static void    throw_NullPointerException(JavaThread* thread);
 200   static void    throw_NullPointerException_at_call(JavaThread* thread);
 201   static void    throw_StackOverflowError(JavaThread* thread);
 202   static void    throw_delayed_StackOverflowError(JavaThread* thread);
 203   static void    throw_StackOverflowError_common(JavaThread* thread, bool delayed);
 204   static address continuation_for_implicit_exception(JavaThread* thread,
 205                                                      address faulting_pc,
 206                                                      ImplicitExceptionKind exception_kind);
 207 
 208   // Post-slow-path-allocation, pre-initializing-stores step for
 209   // implementing e.g. ReduceInitialCardMarks
 210   static void on_slowpath_allocation_exit(JavaThread* thread);
 211 
 212   static void enable_stack_reserved_zone(JavaThread* thread);
 213   static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
 214 
 215   // Shared stub locations
 216   static address get_poll_stub(address pc);
 217 
 218   static address get_ic_miss_stub() {
 219     assert(_ic_miss_blob!= NULL, "oops");
 220     return _ic_miss_blob->entry_point();
 221   }
 222 
 223   static address get_handle_wrong_method_stub() {
 224     assert(_wrong_method_blob!= NULL, "oops");
 225     return _wrong_method_blob->entry_point();
 226   }
 227 
 228   static address get_handle_wrong_method_abstract_stub() {
 229     assert(_wrong_method_abstract_blob!= NULL, "oops");
 230     return _wrong_method_abstract_blob->entry_point();
 231   }
 232 
 233 #ifdef COMPILER2
 234   static void generate_uncommon_trap_blob(void);
 235   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
 236 #endif // COMPILER2
 237 
 238   static address get_resolve_opt_virtual_call_stub() {
 239     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
 240     return _resolve_opt_virtual_call_blob->entry_point();
 241   }
 242   static address get_resolve_virtual_call_stub() {
 243     assert(_resolve_virtual_call_blob != NULL, "oops");
 244     return _resolve_virtual_call_blob->entry_point();
 245   }
 246   static address get_resolve_static_call_stub() {
 247     assert(_resolve_static_call_blob != NULL, "oops");
 248     return _resolve_static_call_blob->entry_point();
 249   }
 250 
 251   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
 252   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
 253   static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }
 254 
 255   // Counters
 256 #ifndef PRODUCT
 257   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
 258 #endif // PRODUCT
 259 
 260   // Helper routine for full-speed JVMTI exception throwing support
 261   static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
 262   static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
 263 
 264   // RedefineClasses() tracing support for obsolete method entry
 265   static int rc_trace_method_entry(JavaThread* thread, Method* m);
 266 
 267   // To be used as the entry point for unresolved native methods.
 268   static address native_method_throw_unsatisfied_link_error_entry();
 269   static address native_method_throw_unsupported_operation_exception_entry();
 270 
 271   static oop retrieve_receiver(Symbol* sig, frame caller);
 272 
 273   static void register_finalizer(JavaThread* thread, oopDesc* obj);
 274 
 275   // dtrace notifications
 276   static int dtrace_object_alloc(oopDesc* o, int size);
 277   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
 278   static int dtrace_method_entry(JavaThread* thread, Method* m);
 279   static int dtrace_method_exit(JavaThread* thread, Method* m);
 280 
 281   // Utility method for retrieving the Java thread id, returns 0 if the
 282   // thread is not a well formed Java thread.
 283   static jlong get_java_tid(Thread* thread);
 284 
 285 
 286   // used by native wrappers to reenable yellow if overflow happened in native code
 287   static void reguard_yellow_pages();
 288 
 289   // Fill in the "X cannot be cast to a Y" message for ClassCastException
 290   //
 291   // @param thr the current thread
 292   // @param caster_klass the class of the object we are casting
 293   // @return the dynamically allocated exception message (must be freed
 294   // by the caller using a resource mark)
 295   //
 296   // BCP must refer to the current 'checkcast' opcode for the frame
 297   // on top of the stack.
 298   // The caller (or one of its callers) must use a ResourceMark
 299   // in order to correctly free the result.
 300   //
 301   static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
 302 
 303   // Fill in the "X cannot be cast to a Y" message for ClassCastException
 304   //
 305   // @param caster_klass the class of the object we are casting
 306   // @param target_klass the target klass attempt
 307   // @return the dynamically allocated exception message (must be freed
 308   // by the caller using a resource mark)
 309   //
 310   // This version does not require access the frame, so it can be called
 311   // from interpreted code
 312   // The caller (or one of it's callers) must use a ResourceMark
 313   // in order to correctly free the result.
 314   //
 315   static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);
 316 
 317   // Resolves a call site- may patch in the destination of the call into the
 318   // compiled code.
 319   static methodHandle resolve_helper(JavaThread *thread,
 320                                      bool is_virtual,
 321                                      bool is_optimized, TRAPS);
 322 
 323  private:
 324   // deopt blob
 325   static void generate_deopt_blob(void);
 326 
 327   static bool handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, const frame& caller_frame,
 328                                              methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
 329                                              bool& needs_ic_stub_refill, TRAPS);
 330 
 331  public:
 332   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
 333 
 334   // Resets a call-site in compiled code so it will get resolved again.
 335   static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
 336 
 337   // In the code prolog, if the klass comparison fails, the inline cache
 338   // misses and the call site is patched to megamorphic
 339   static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
 340 
 341   // Find the method that called us.
 342   static methodHandle find_callee_method(JavaThread* thread, TRAPS);
 343 
 344 
 345  private:
 346   static Handle find_callee_info(JavaThread* thread,
 347                                  Bytecodes::Code& bc,
 348                                  CallInfo& callinfo, TRAPS);
 349   static Handle find_callee_info_helper(JavaThread* thread,
 350                                         vframeStream& vfst,
 351                                         Bytecodes::Code& bc,
 352                                         CallInfo& callinfo, TRAPS);
 353 
 354   static methodHandle extract_attached_method(vframeStream& vfst);
 355 
 356   static address clean_virtual_call_entry();
 357   static address clean_opt_virtual_call_entry();
 358   static address clean_static_call_entry();
 359 
 360 #if defined(X86) && defined(COMPILER1)
 361   // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
 362   static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
 363 #endif // X86 && COMPILER1
 364 
 365  public:
 366 
 367   // Read the array of BasicTypes from a Java signature, and compute where
 368   // compiled Java code would like to put the results.  Values in reg_lo and
 369   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
 370   // registers, those above refer to 4-byte stack slots.  All stack slots are
 371   // based off of the window top.  SharedInfo::stack0 refers to the first usable
 372   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
 373   // 4-bytes higher. So for sparc because the register window save area is at
 374   // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
 375   // will be just above it. (
 376   // return value is the maximum number of VMReg stack slots the convention will use.
 377   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
 378 
 379   static void check_member_name_argument_is_last_argument(const methodHandle& method,
 380                                                           const BasicType* sig_bt,
 381                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
 382 
 383   // Ditto except for calling C
 384   //
 385   // C argument in register AND stack slot.
 386   // Some architectures require that an argument must be passed in a register
 387   // AND in a stack slot. These architectures provide a second VMRegPair array
 388   // to be filled by the c_calling_convention method. On other architectures,
 389   // NULL is being passed as the second VMRegPair array, so arguments are either
 390   // passed in a register OR in a stack slot.
 391   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
 392                                   int total_args_passed);
 393 
 394   static size_t trampoline_size();
 395 
 396   static void generate_trampoline(MacroAssembler *masm, address destination);
 397 
 398   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
 399   // blobs. Unlike adapters in the tiger and earlier releases the code in these
 400   // blobs does not create a new frame and are therefore virtually invisible
 401   // to the stack walking code. In general these blobs extend the callers stack
 402   // as needed for the conversion of argument locations.
 403 
 404   // When calling a c2i blob the code will always call the interpreter even if
 405   // by the time we reach the blob there is compiled code available. This allows
 406   // the blob to pass the incoming stack pointer (the sender sp) in a known
 407   // location for the interpreter to record. This is used by the frame code
 408   // to correct the sender code to match up with the stack pointer when the
 409   // thread left the compiled code. In addition it allows the interpreter
 410   // to remove the space the c2i adapter allocated to do its argument conversion.
 411 
 412   // Although a c2i blob will always run interpreted even if compiled code is
 413   // present if we see that compiled code is present the compiled call site
 414   // will be patched/re-resolved so that later calls will run compiled.
 415 
 416   // Additionally a c2i blob need to have a unverified entry because it can be reached
 417   // in situations where the call site is an inlined cache site and may go megamorphic.
 418 
 419   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
 420   // that the interpreter before it does any call dispatch will record the current
 421   // stack pointer in the interpreter frame. On return it will restore the stack
 422   // pointer as needed. This means the i2c adapter code doesn't need any special
 423   // handshaking path with compiled code to keep the stack walking correct.
 424 
 425   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
 426                                                       int total_args_passed,
 427                                                       int max_arg,
 428                                                       const BasicType *sig_bt,
 429                                                       const VMRegPair *regs,
 430                                                       AdapterFingerPrint* fingerprint);
 431 
 432   static void gen_i2c_adapter(MacroAssembler *_masm,
 433                               int total_args_passed,
 434                               int comp_args_on_stack,
 435                               const BasicType *sig_bt,
 436                               const VMRegPair *regs);
 437 
 438 
 439   static jlong continuation_getFP(JavaThread *thread);
 440 
 441   // OSR support
 442 
 443   // OSR_migration_begin will extract the jvm state from an interpreter
 444   // frame (locals, monitors) and store the data in a piece of C heap
 445   // storage. This then allows the interpreter frame to be removed from the
 446   // stack and the OSR nmethod to be called. That method is called with a
 447   // pointer to the C heap storage. This pointer is the return value from
 448   // OSR_migration_begin.
 449 
 450   static intptr_t* OSR_migration_begin(JavaThread *thread);
 451 
 452   // OSR_migration_end is a trivial routine. It is called after the compiled
 453   // method has extracted the jvm state from the C heap that OSR_migration_begin
 454   // created. It's entire job is to simply free this storage.
 455   static void OSR_migration_end(intptr_t* buf);
 456 
 457   // Convert a sig into a calling convention register layout
 458   // and find interesting things about it.
 459   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
 460   static VMReg name_for_receiver();
 461 
 462   // "Top of Stack" slots that may be unused by the calling convention but must
 463   // otherwise be preserved.
 464   // On Intel these are not necessary and the value can be zero.
 465   // On Sparc this describes the words reserved for storing a register window
 466   // when an interrupt occurs.
 467   static uint out_preserve_stack_slots();
 468 
 469   // Is vector's size (in bytes) bigger than a size saved by default?
 470   // For example, on x86 16 bytes XMM registers are saved by default.
 471   static bool is_wide_vector(int size);
 472 
 473   // Save and restore a native result
 474   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
 475   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
 476 
 477   // Generate a native wrapper for a given method.  The method takes arguments
 478   // in the Java compiled code convention, marshals them to the native
 479   // convention (handlizes oops, etc), transitions to native, makes the call,
 480   // returns to java state (possibly blocking), unhandlizes any result and
 481   // returns.
 482   //
 483   // The wrapper may contain special-case code if the given method
 484   // is a JNI critical method, or a compiled method handle adapter,
 485   // such as _invokeBasic, _linkToVirtual, etc.
 486   static nmethod* generate_native_wrapper(MacroAssembler* masm,
 487                                           const methodHandle& method,
 488                                           int compile_id,
 489                                           BasicType* sig_bt,
 490                                           VMRegPair* regs,
 491                                           BasicType ret_type,
 492                                           address critical_entry);
 493 
 494   // Block before entering a JNI critical method
 495   static void block_for_jni_critical(JavaThread* thread);
 496 
 497   // Pin/Unpin object
 498   static oopDesc* pin_object(JavaThread* thread, oopDesc* obj);
 499   static void unpin_object(JavaThread* thread, oopDesc* obj);
 500 
 501   // A compiled caller has just called the interpreter, but compiled code
 502   // exists.  Patch the caller so he no longer calls into the interpreter.
 503   static void fixup_callers_callsite(Method* moop, address ret_pc);
 504   static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
 505 
 506   // Slow-path Locking and Unlocking
 507   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 508   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 509 
 510   // Resolving of calls
 511   static address resolve_static_call_C     (JavaThread *thread);
 512   static address resolve_virtual_call_C    (JavaThread *thread);
 513   static address resolve_opt_virtual_call_C(JavaThread *thread);
 514 
 515   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
 516   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
 517                                oopDesc* dest, jint dest_pos,
 518                                jint length, JavaThread* thread);
 519 
 520   // handle ic miss with caller being compiled code
 521   // wrong method handling (inline cache misses, zombie methods)
 522   static address handle_wrong_method(JavaThread* thread);
 523   static address handle_wrong_method_abstract(JavaThread* thread);
 524   static address handle_wrong_method_ic_miss(JavaThread* thread);
 525 
 526   static address handle_unsafe_access(JavaThread* thread, address next_pc);
 527 
 528 #ifndef PRODUCT
 529 
 530   // Collect and print inline cache miss statistics
 531  private:
 532   enum { maxICmiss_count = 100 };
 533   static int     _ICmiss_index;                  // length of IC miss histogram
 534   static int     _ICmiss_count[maxICmiss_count]; // miss counts
 535   static address _ICmiss_at[maxICmiss_count];    // miss addresses
 536   static void trace_ic_miss(address at);
 537 
 538  public:
 539   static int _throw_null_ctr;                    // throwing a null-pointer exception
 540   static int _ic_miss_ctr;                       // total # of IC misses
 541   static int _wrong_method_ctr;
 542   static int _resolve_static_ctr;
 543   static int _resolve_virtual_ctr;
 544   static int _resolve_opt_virtual_ctr;
 545   static int _implicit_null_throws;
 546   static int _implicit_div0_throws;
 547 
 548   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
 549   static int _jshort_array_copy_ctr;       // Slow-path short array copy
 550   static int _jint_array_copy_ctr;         // Slow-path int array copy
 551   static int _jlong_array_copy_ctr;        // Slow-path long array copy
 552   static int _oop_array_copy_ctr;          // Slow-path oop array copy
 553   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
 554   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
 555   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
 556   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
 557 
 558   static int _new_instance_ctr;            // 'new' object requires GC
 559   static int _new_array_ctr;               // 'new' array requires GC
 560   static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
 561   static int _find_handler_ctr;            // find exception handler
 562   static int _rethrow_ctr;                 // rethrow exception
 563   static int _mon_enter_stub_ctr;          // monitor enter stub
 564   static int _mon_exit_stub_ctr;           // monitor exit stub
 565   static int _mon_enter_ctr;               // monitor enter slow
 566   static int _mon_exit_ctr;                // monitor exit slow
 567   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
 568 
 569   // Statistics code
 570   // stats for "normal" compiled calls (non-interface)
 571   static int     _nof_normal_calls;              // total # of calls
 572   static int     _nof_optimized_calls;           // total # of statically-bound calls
 573   static int     _nof_inlined_calls;             // total # of inlined normal calls
 574   static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)
 575   static int     _nof_inlined_static_calls;      // total # of inlined static calls
 576   // stats for compiled interface calls
 577   static int     _nof_interface_calls;           // total # of compiled calls
 578   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
 579   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
 580   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
 581   // stats for runtime exceptions
 582   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
 583 
 584  public: // for compiler
 585   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
 586   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
 587   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
 588   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
 589   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
 590   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
 591   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
 592   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
 593   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
 594   static void print_call_statistics(int comp_total);
 595   static void print_statistics();
 596   static void print_ic_miss_histogram();
 597 
 598 #endif // PRODUCT
 599 };
 600 
 601 
 602 // ---------------------------------------------------------------------------
 603 // Implementation of AdapterHandlerLibrary
 604 //
 605 // This library manages argument marshaling adapters and native wrappers.
 606 // There are 2 flavors of adapters: I2C and C2I.
 607 //
 608 // The I2C flavor takes a stock interpreted call setup, marshals the
 609 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
 610 // code_begin().  It is broken to call it without an nmethod assigned.
 611 // The usual behavior is to lift any register arguments up out of the
 612 // stack and possibly re-pack the extra arguments to be contiguous.
 613 // I2C adapters will save what the interpreter's stack pointer will be
 614 // after arguments are popped, then adjust the interpreter's frame
 615 // size to force alignment and possibly to repack the arguments.
 616 // After re-packing, it jumps to the compiled code start.  There are
 617 // no safepoints in this adapter code and a GC cannot happen while
 618 // marshaling is in progress.
 619 //
 620 // The C2I flavor takes a stock compiled call setup plus the target method in
 621 // Rmethod, marshals the arguments for an interpreted call and jumps to
 622 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
 623 // setup.  Compiled frames are fixed-size and the args are likely not in the
 624 // right place.  Hence all the args will likely be copied into the
 625 // interpreter's frame, forcing that frame to grow.  The compiled frame's
 626 // outgoing stack args will be dead after the copy.
 627 //
 628 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
 629 // also perform an official frame push & pop.  They have a call to the native
 630 // routine in their middles and end in a return (instead of ending in a jump).
 631 // The native wrappers are stored in real nmethods instead of the BufferBlobs
 632 // used by the adapters.  The code generation happens here because it's very
 633 // similar to what the adapters have to do.
 634 
 635 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
 636   friend class AdapterHandlerTable;
 637 
 638  private:
 639   AdapterFingerPrint* _fingerprint;
 640   address _i2c_entry;
 641   address _c2i_entry;
 642   address _c2i_unverified_entry;
 643   address _c2i_no_clinit_check_entry;
 644 
 645 #ifdef ASSERT
 646   // Captures code and signature used to generate this adapter when
 647   // verifying adapter equivalence.
 648   unsigned char* _saved_code;
 649   int            _saved_code_length;
 650 #endif
 651 
 652   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry) {
 653     _fingerprint = fingerprint;
 654     _i2c_entry = i2c_entry;
 655     _c2i_entry = c2i_entry;
 656     _c2i_unverified_entry = c2i_unverified_entry;
 657     _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry;
 658 #ifdef ASSERT
 659     _saved_code = NULL;
 660     _saved_code_length = 0;
 661 #endif
 662   }
 663 
 664   void deallocate();
 665 
 666   // should never be used
 667   AdapterHandlerEntry();
 668 
 669  public:
 670   address get_i2c_entry()                  const { return _i2c_entry; }
 671   address get_c2i_entry()                  const { return _c2i_entry; }
 672   address get_c2i_unverified_entry()       const { return _c2i_unverified_entry; }
 673   address get_c2i_no_clinit_check_entry()  const { return _c2i_no_clinit_check_entry; }
 674 
 675   address base_address();
 676   void relocate(address new_base);
 677 
 678   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
 679 
 680   AdapterHandlerEntry* next() {
 681     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
 682   }
 683 
 684 #ifdef ASSERT
 685   // Used to verify that code generated for shared adapters is equivalent
 686   void save_code   (unsigned char* code, int length);
 687   bool compare_code(unsigned char* code, int length);
 688 #endif
 689 
 690   //virtual void print_on(outputStream* st) const;  DO NOT USE
 691   void print_adapter_on(outputStream* st) const;
 692 };
 693 
 694 // This class is used only with DumpSharedSpaces==true. It holds extra information
 695 // that's used only during CDS dump time.
 696 // For details, see comments around Method::link_method()
 697 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
 698   address               _c2i_entry_trampoline;   // allocated from shared spaces "MC" region
 699   AdapterHandlerEntry** _adapter_trampoline;     // allocated from shared spaces "MD" region
 700 
 701 public:
 702   address get_c2i_entry_trampoline()             const { return _c2i_entry_trampoline; }
 703   AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
 704   void init() NOT_CDS_RETURN;
 705 };
 706 
 707 
 708 class AdapterHandlerLibrary: public AllStatic {
 709  private:
 710   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
 711   static AdapterHandlerTable* _adapters;
 712   static AdapterHandlerEntry* _abstract_method_handler;
 713   static BufferBlob* buffer_blob();
 714   static void initialize();
 715   static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
 716 
 717  public:
 718 
 719   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
 720                                         address i2c_entry,
 721                                         address c2i_entry,
 722                                         address c2i_unverified_entry,
 723                                         address c2i_no_clinit_check_entry = NULL);
 724   static void create_native_wrapper(const methodHandle& method);
 725   static AdapterHandlerEntry* get_adapter(const methodHandle& method);
 726 
 727   static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
 728   static void print_handler_on(outputStream* st, const CodeBlob* b);
 729   static bool contains(const CodeBlob* b);
 730 #ifndef PRODUCT
 731   static void print_statistics();
 732 #endif // PRODUCT
 733 
 734 };
 735 
 736 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP