1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
  26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
  27 
  28 #include "interpreter/bytecodeHistogram.hpp"
  29 #include "interpreter/bytecodeTracer.hpp"
  30 #include "interpreter/linkResolver.hpp"
  31 #include "memory/allocation.hpp"
  32 #include "memory/resourceArea.hpp"
  33 #include "runtime/threadLocalStorage.hpp"
  34 #include "utilities/hashtable.hpp"
  35 #include "utilities/macros.hpp"
  36 
  37 class AdapterHandlerEntry;
  38 class AdapterHandlerTable;
  39 class AdapterFingerPrint;
  40 class vframeStream;
  41 
  42 // Runtime is the base class for various runtime interfaces
  43 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
  44 // shared functionality such as exception forwarding (C++ to
  45 // Java exceptions), locking/unlocking mechanisms, statistical
  46 // information, etc.
  47 
  48 class SharedRuntime: AllStatic {
  49   friend class VMStructs;
  50 
  51  private:
  52   static methodHandle resolve_sub_helper(JavaThread *thread,
  53                                      bool is_virtual,
  54                                      bool is_optimized, TRAPS);
  55 
  56   // Shared stub locations
  57 
  58   static RuntimeStub*        _wrong_method_blob;
  59   static RuntimeStub*        _ic_miss_blob;
  60   static RuntimeStub*        _resolve_opt_virtual_call_blob;
  61   static RuntimeStub*        _resolve_virtual_call_blob;
  62   static RuntimeStub*        _resolve_static_call_blob;
  63 
  64   static DeoptimizationBlob* _deopt_blob;
  65 
  66   static SafepointBlob*      _polling_page_vectors_safepoint_handler_blob;
  67   static SafepointBlob*      _polling_page_safepoint_handler_blob;
  68   static SafepointBlob*      _polling_page_return_handler_blob;
  69 
  70 #ifdef COMPILER2
  71   static UncommonTrapBlob*   _uncommon_trap_blob;
  72 #endif // COMPILER2
  73 
  74 #ifndef PRODUCT
  75   // Counters
  76   static int     _nof_megamorphic_calls;         // total # of megamorphic calls (through vtable)
  77 #endif // !PRODUCT
  78 
  79  private:
  80   enum { POLL_AT_RETURN,  POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
  81   static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
  82   static RuntimeStub*   generate_resolve_blob(address destination, const char* name);
  83 
  84  public:
  85   static void generate_stubs(void);
  86 
  87   // max bytes for each dtrace string parameter
  88   enum { max_dtrace_string_size = 256 };
  89 
  90   // The following arithmetic routines are used on platforms that do
  91   // not have machine instructions to implement their functionality.
  92   // Do not remove these.
  93 
  94   // long arithmetics
  95   static jlong   lmul(jlong y, jlong x);
  96   static jlong   ldiv(jlong y, jlong x);
  97   static jlong   lrem(jlong y, jlong x);
  98 
  99   // float and double remainder
 100   static jfloat  frem(jfloat  x, jfloat  y);
 101   static jdouble drem(jdouble x, jdouble y);
 102 
 103 #ifdef __SOFTFP__
 104   static jfloat  fadd(jfloat x, jfloat y);
 105   static jfloat  fsub(jfloat x, jfloat y);
 106   static jfloat  fmul(jfloat x, jfloat y);
 107   static jfloat  fdiv(jfloat x, jfloat y);
 108 
 109   static jdouble dadd(jdouble x, jdouble y);
 110   static jdouble dsub(jdouble x, jdouble y);
 111   static jdouble dmul(jdouble x, jdouble y);
 112   static jdouble ddiv(jdouble x, jdouble y);
 113 #endif // __SOFTFP__
 114 
 115   // float conversion (needs to set appropriate rounding mode)
 116   static jint    f2i (jfloat  x);
 117   static jlong   f2l (jfloat  x);
 118   static jint    d2i (jdouble x);
 119   static jlong   d2l (jdouble x);
 120   static jfloat  d2f (jdouble x);
 121   static jfloat  l2f (jlong   x);
 122   static jdouble l2d (jlong   x);
 123 
 124 #ifdef __SOFTFP__
 125   static jfloat  i2f (jint    x);
 126   static jdouble i2d (jint    x);
 127   static jdouble f2d (jfloat  x);
 128 #endif // __SOFTFP__
 129 
 130   // double trigonometrics and transcendentals
 131   static jdouble dsin(jdouble x);
 132   static jdouble dcos(jdouble x);
 133   static jdouble dtan(jdouble x);
 134   static jdouble dlog(jdouble x);
 135   static jdouble dlog10(jdouble x);
 136   static jdouble dexp(jdouble x);
 137   static jdouble dpow(jdouble x, jdouble y);
 138 
 139 #if defined(__SOFTFP__) || defined(E500V2)
 140   static double dabs(double f);
 141 #endif
 142 
 143 #if defined(__SOFTFP__) || defined(PPC32)
 144   static double dsqrt(double f);
 145 #endif
 146 
 147 #ifdef __SOFTFP__
 148   // C++ compiler generates soft float instructions as well as passing
 149   // float and double in registers.
 150   static int  fcmpl(float x, float y);
 151   static int  fcmpg(float x, float y);
 152   static int  dcmpl(double x, double y);
 153   static int  dcmpg(double x, double y);
 154 
 155   static int unordered_fcmplt(float x, float y);
 156   static int unordered_dcmplt(double x, double y);
 157   static int unordered_fcmple(float x, float y);
 158   static int unordered_dcmple(double x, double y);
 159   static int unordered_fcmpge(float x, float y);
 160   static int unordered_dcmpge(double x, double y);
 161   static int unordered_fcmpgt(float x, float y);
 162   static int unordered_dcmpgt(double x, double y);
 163 
 164   static float  fneg(float f);
 165   static double dneg(double f);
 166 #endif
 167 
 168   // exception handling across interpreter/compiler boundaries
 169   static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
 170   static address exception_handler_for_return_address(JavaThread* thread, address return_address);
 171 
 172 #if INCLUDE_ALL_GCS
 173   // G1 write barriers
 174   static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
 175   static void g1_wb_post(void* card_addr, JavaThread* thread);
 176 #endif // INCLUDE_ALL_GCS
 177 
 178   // exception handling and implicit exceptions
 179   static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
 180                                               bool force_unwind, bool top_frame_only);
 181   enum ImplicitExceptionKind {
 182     IMPLICIT_NULL,
 183     IMPLICIT_DIVIDE_BY_ZERO,
 184     STACK_OVERFLOW
 185   };
 186   static void    throw_AbstractMethodError(JavaThread* thread);
 187   static void    throw_IncompatibleClassChangeError(JavaThread* thread);
 188   static void    throw_ArithmeticException(JavaThread* thread);
 189   static void    throw_NullPointerException(JavaThread* thread);
 190   static void    throw_NullPointerException_at_call(JavaThread* thread);
 191   static void    throw_StackOverflowError(JavaThread* thread);
 192   static address continuation_for_implicit_exception(JavaThread* thread,
 193                                                      address faulting_pc,
 194                                                      ImplicitExceptionKind exception_kind);
 195 
 196   // Shared stub locations
 197   static address get_poll_stub(address pc);
 198 
 199   static address get_ic_miss_stub() {
 200     assert(_ic_miss_blob!= NULL, "oops");
 201     return _ic_miss_blob->entry_point();
 202   }
 203 
 204   static address get_handle_wrong_method_stub() {
 205     assert(_wrong_method_blob!= NULL, "oops");
 206     return _wrong_method_blob->entry_point();
 207   }
 208 
 209 #ifdef COMPILER2
 210   static void generate_uncommon_trap_blob(void);
 211   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
 212 #endif // COMPILER2
 213 
 214   static address get_resolve_opt_virtual_call_stub(){
 215     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
 216     return _resolve_opt_virtual_call_blob->entry_point();
 217   }
 218   static address get_resolve_virtual_call_stub() {
 219     assert(_resolve_virtual_call_blob != NULL, "oops");
 220     return _resolve_virtual_call_blob->entry_point();
 221   }
 222   static address get_resolve_static_call_stub() {
 223     assert(_resolve_static_call_blob != NULL, "oops");
 224     return _resolve_static_call_blob->entry_point();
 225   }
 226 
 227   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
 228   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
 229   static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }
 230 
 231   // Counters
 232 #ifndef PRODUCT
 233   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
 234 #endif // PRODUCT
 235 
 236   // Helper routine for full-speed JVMTI exception throwing support
 237   static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
 238   static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
 239 
 240   // RedefineClasses() tracing support for obsolete method entry
 241   static int rc_trace_method_entry(JavaThread* thread, Method* m);
 242 
 243   // To be used as the entry point for unresolved native methods.
 244   static address native_method_throw_unsatisfied_link_error_entry();
 245   static address native_method_throw_unsupported_operation_exception_entry();
 246 
 247   // bytecode tracing is only used by the TraceBytecodes
 248   static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
 249 
 250   // Used to back off a spin lock that is under heavy contention
 251   static void yield_all(JavaThread* thread, int attempts = 0);
 252 
 253   static oop retrieve_receiver( Symbol* sig, frame caller );
 254 
 255   static void register_finalizer(JavaThread* thread, oopDesc* obj);
 256 
 257   // dtrace notifications
 258   static int dtrace_object_alloc(oopDesc* o);
 259   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
 260   static int dtrace_method_entry(JavaThread* thread, Method* m);
 261   static int dtrace_method_exit(JavaThread* thread, Method* m);
 262 
 263   // Utility method for retrieving the Java thread id, returns 0 if the
 264   // thread is not a well formed Java thread.
 265   static jlong get_java_tid(Thread* thread);
 266 
 267 
 268   // used by native wrappers to reenable yellow if overflow happened in native code
 269   static void reguard_yellow_pages();
 270 
 271   /**
 272    * Fill in the "X cannot be cast to a Y" message for ClassCastException
 273    *
 274    * @param thr the current thread
 275    * @param name the name of the class of the object attempted to be cast
 276    * @return the dynamically allocated exception message (must be freed
 277    * by the caller using a resource mark)
 278    *
 279    * BCP must refer to the current 'checkcast' opcode for the frame
 280    * on top of the stack.
 281    * The caller (or one of it's callers) must use a ResourceMark
 282    * in order to correctly free the result.
 283    */
 284   static char* generate_class_cast_message(JavaThread* thr, const char* name);
 285 
 286   /**
 287    * Fill in the "X cannot be cast to a Y" message for ClassCastException
 288    *
 289    * @param name the name of the class of the object attempted to be cast
 290    * @param klass the name of the target klass attempt
 291    * @param gripe the specific kind of problem being reported
 292    * @return the dynamically allocated exception message (must be freed
 293    * by the caller using a resource mark)
 294    *
 295    * This version does not require access the frame, so it can be called
 296    * from interpreted code
 297    * The caller (or one of it's callers) must use a ResourceMark
 298    * in order to correctly free the result.
 299    */
 300   static char* generate_class_cast_message(const char* name, const char* klass,
 301                                            const char* gripe = " cannot be cast to ");
 302 
 303   // Resolves a call site- may patch in the destination of the call into the
 304   // compiled code.
 305   static methodHandle resolve_helper(JavaThread *thread,
 306                                      bool is_virtual,
 307                                      bool is_optimized, TRAPS);
 308 
 309   private:
 310   // deopt blob
 311   static void generate_deopt_blob(void);
 312 
 313   public:
 314   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
 315 
 316   // Resets a call-site in compiled code so it will get resolved again.
 317   static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
 318 
 319   // In the code prolog, if the klass comparison fails, the inline cache
 320   // misses and the call site is patched to megamorphic
 321   static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
 322 
 323   // Find the method that called us.
 324   static methodHandle find_callee_method(JavaThread* thread, TRAPS);
 325 
 326 
 327  private:
 328   static Handle find_callee_info(JavaThread* thread,
 329                                  Bytecodes::Code& bc,
 330                                  CallInfo& callinfo, TRAPS);
 331   static Handle find_callee_info_helper(JavaThread* thread,
 332                                         vframeStream& vfst,
 333                                         Bytecodes::Code& bc,
 334                                         CallInfo& callinfo, TRAPS);
 335 
 336   static address clean_virtual_call_entry();
 337   static address clean_opt_virtual_call_entry();
 338   static address clean_static_call_entry();
 339 
 340  public:
 341 
 342   // Read the array of BasicTypes from a Java signature, and compute where
 343   // compiled Java code would like to put the results.  Values in reg_lo and
 344   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
 345   // registers, those above refer to 4-byte stack slots.  All stack slots are
 346   // based off of the window top.  SharedInfo::stack0 refers to the first usable
 347   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
 348   // 4-bytes higher. So for sparc because the register window save area is at
 349   // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
 350   // will be just above it. (
 351   // return value is the maximum number of VMReg stack slots the convention will use.
 352   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
 353 
 354   static void check_member_name_argument_is_last_argument(methodHandle method,
 355                                                           const BasicType* sig_bt,
 356                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
 357 
 358   // Ditto except for calling C
 359   //
 360   // C argument in register AND stack slot.
 361   // Some architectures require that an argument must be passed in a register
 362   // AND in a stack slot. These architectures provide a second VMRegPair array
 363   // to be filled by the c_calling_convention method. On other architectures,
 364   // NULL is being passed as the second VMRegPair array, so arguments are either
 365   // passed in a register OR in a stack slot.
 366   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
 367                                   int total_args_passed);
 368 
 369   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
 370   // blobs. Unlike adapters in the tiger and earlier releases the code in these
 371   // blobs does not create a new frame and are therefore virtually invisible
 372   // to the stack walking code. In general these blobs extend the callers stack
 373   // as needed for the conversion of argument locations.
 374 
 375   // When calling a c2i blob the code will always call the interpreter even if
 376   // by the time we reach the blob there is compiled code available. This allows
 377   // the blob to pass the incoming stack pointer (the sender sp) in a known
 378   // location for the interpreter to record. This is used by the frame code
 379   // to correct the sender code to match up with the stack pointer when the
 380   // thread left the compiled code. In addition it allows the interpreter
 381   // to remove the space the c2i adapter allocated to do it argument conversion.
 382 
 383   // Although a c2i blob will always run interpreted even if compiled code is
 384   // present if we see that compiled code is present the compiled call site
 385   // will be patched/re-resolved so that later calls will run compiled.
 386 
 387   // Aditionally a c2i blob need to have a unverified entry because it can be reached
 388   // in situations where the call site is an inlined cache site and may go megamorphic.
 389 
 390   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
 391   // that the interpreter before it does any call dispatch will record the current
 392   // stack pointer in the interpreter frame. On return it will restore the stack
 393   // pointer as needed. This means the i2c adapter code doesn't need any special
 394   // handshaking path with compiled code to keep the stack walking correct.
 395 
 396   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
 397                                                       int total_args_passed,
 398                                                       int max_arg,
 399                                                       const BasicType *sig_bt,
 400                                                       const VMRegPair *regs,
 401                                                       AdapterFingerPrint* fingerprint);
 402 
 403   // OSR support
 404 
 405   // OSR_migration_begin will extract the jvm state from an interpreter
 406   // frame (locals, monitors) and store the data in a piece of C heap
 407   // storage. This then allows the interpreter frame to be removed from the
 408   // stack and the OSR nmethod to be called. That method is called with a
 409   // pointer to the C heap storage. This pointer is the return value from
 410   // OSR_migration_begin.
 411 
 412   static intptr_t* OSR_migration_begin( JavaThread *thread);
 413 
 414   // OSR_migration_end is a trivial routine. It is called after the compiled
 415   // method has extracted the jvm state from the C heap that OSR_migration_begin
 416   // created. It's entire job is to simply free this storage.
 417   static void      OSR_migration_end  ( intptr_t* buf);
 418 
 419   // Convert a sig into a calling convention register layout
 420   // and find interesting things about it.
 421   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
 422   static VMReg     name_for_receiver();
 423 
 424   // "Top of Stack" slots that may be unused by the calling convention but must
 425   // otherwise be preserved.
 426   // On Intel these are not necessary and the value can be zero.
 427   // On Sparc this describes the words reserved for storing a register window
 428   // when an interrupt occurs.
 429   static uint out_preserve_stack_slots();
 430 
 431   // Is vector's size (in bytes) bigger than a size saved by default?
 432   // For example, on x86 16 bytes XMM registers are saved by default.
 433   static bool is_wide_vector(int size);
 434 
 435   // Save and restore a native result
 436   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
 437   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
 438 
 439   // Generate a native wrapper for a given method.  The method takes arguments
 440   // in the Java compiled code convention, marshals them to the native
 441   // convention (handlizes oops, etc), transitions to native, makes the call,
 442   // returns to java state (possibly blocking), unhandlizes any result and
 443   // returns.
 444   //
 445   // The wrapper may contain special-case code if the given method
 446   // is a JNI critical method, or a compiled method handle adapter,
 447   // such as _invokeBasic, _linkToVirtual, etc.
 448   static nmethod* generate_native_wrapper(MacroAssembler* masm,
 449                                           methodHandle method,
 450                                           int compile_id,
 451                                           BasicType* sig_bt,
 452                                           VMRegPair* regs,
 453                                           BasicType ret_type );
 454 
 455   // Block before entering a JNI critical method
 456   static void block_for_jni_critical(JavaThread* thread);
 457 
 458 #ifdef HAVE_DTRACE_H
 459   // Generate a dtrace wrapper for a given method.  The method takes arguments
 460   // in the Java compiled code convention, marshals them to the native
 461   // convention (handlizes oops, etc), transitions to native, makes the call,
 462   // returns to java state (possibly blocking), unhandlizes any result and
 463   // returns.
 464   static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
 465                                           methodHandle method);
 466 
 467   // dtrace support to convert a Java string to utf8
 468   static void get_utf(oopDesc* src, address dst);
 469 #endif // def HAVE_DTRACE_H
 470 
 471   // A compiled caller has just called the interpreter, but compiled code
 472   // exists.  Patch the caller so he no longer calls into the interpreter.
 473   static void fixup_callers_callsite(Method* moop, address ret_pc);
 474 
 475   // Slow-path Locking and Unlocking
 476   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 477   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
 478 
 479   // Resolving of calls
 480   static address resolve_static_call_C     (JavaThread *thread);
 481   static address resolve_virtual_call_C    (JavaThread *thread);
 482   static address resolve_opt_virtual_call_C(JavaThread *thread);
 483 
 484   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
 485   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
 486                                oopDesc* dest, jint dest_pos,
 487                                jint length, JavaThread* thread);
 488 
 489   // handle ic miss with caller being compiled code
 490   // wrong method handling (inline cache misses, zombie methods)
 491   static address handle_wrong_method(JavaThread* thread);
 492   static address handle_wrong_method_ic_miss(JavaThread* thread);
 493 
 494 #ifndef PRODUCT
 495 
 496   // Collect and print inline cache miss statistics
 497  private:
 498   enum { maxICmiss_count = 100 };
 499   static int     _ICmiss_index;                  // length of IC miss histogram
 500   static int     _ICmiss_count[maxICmiss_count]; // miss counts
 501   static address _ICmiss_at[maxICmiss_count];    // miss addresses
 502   static void trace_ic_miss(address at);
 503 
 504  public:
 505   static int _monitor_enter_ctr;                 // monitor enter slow
 506   static int _monitor_exit_ctr;                  // monitor exit slow
 507   static int _throw_null_ctr;                    // throwing a null-pointer exception
 508   static int _ic_miss_ctr;                       // total # of IC misses
 509   static int _wrong_method_ctr;
 510   static int _resolve_static_ctr;
 511   static int _resolve_virtual_ctr;
 512   static int _resolve_opt_virtual_ctr;
 513   static int _implicit_null_throws;
 514   static int _implicit_div0_throws;
 515 
 516   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
 517   static int _jshort_array_copy_ctr;       // Slow-path short array copy
 518   static int _jint_array_copy_ctr;         // Slow-path int array copy
 519   static int _jlong_array_copy_ctr;        // Slow-path long array copy
 520   static int _oop_array_copy_ctr;          // Slow-path oop array copy
 521   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
 522   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
 523   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
 524   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
 525 
 526   static int _new_instance_ctr;            // 'new' object requires GC
 527   static int _new_array_ctr;               // 'new' array requires GC
 528   static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
 529   static int _find_handler_ctr;            // find exception handler
 530   static int _rethrow_ctr;                 // rethrow exception
 531   static int _mon_enter_stub_ctr;          // monitor enter stub
 532   static int _mon_exit_stub_ctr;           // monitor exit stub
 533   static int _mon_enter_ctr;               // monitor enter slow
 534   static int _mon_exit_ctr;                // monitor exit slow
 535   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
 536 
 537   // Statistics code
 538   // stats for "normal" compiled calls (non-interface)
 539   static int     _nof_normal_calls;              // total # of calls
 540   static int     _nof_optimized_calls;           // total # of statically-bound calls
 541   static int     _nof_inlined_calls;             // total # of inlined normal calls
 542   static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)
 543   static int     _nof_inlined_static_calls;      // total # of inlined static calls
 544   // stats for compiled interface calls
 545   static int     _nof_interface_calls;           // total # of compiled calls
 546   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
 547   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
 548   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
 549   // stats for runtime exceptions
 550   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
 551 
 552  public: // for compiler
 553   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
 554   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
 555   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
 556   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
 557   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
 558   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
 559   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
 560   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
 561   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
 562   static void print_call_statistics(int comp_total);
 563   static void print_statistics();
 564   static void print_ic_miss_histogram();
 565 
 566 #endif // PRODUCT
 567 };
 568 
 569 
 570 // ---------------------------------------------------------------------------
 571 // Implementation of AdapterHandlerLibrary
 572 //
 573 // This library manages argument marshaling adapters and native wrappers.
 574 // There are 2 flavors of adapters: I2C and C2I.
 575 //
 576 // The I2C flavor takes a stock interpreted call setup, marshals the
 577 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
 578 // code_begin().  It is broken to call it without an nmethod assigned.
 579 // The usual behavior is to lift any register arguments up out of the
 580 // stack and possibly re-pack the extra arguments to be contigious.
 581 // I2C adapters will save what the interpreter's stack pointer will be
 582 // after arguments are popped, then adjust the interpreter's frame
 583 // size to force alignment and possibly to repack the arguments.
 584 // After re-packing, it jumps to the compiled code start.  There are
 585 // no safepoints in this adapter code and a GC cannot happen while
 586 // marshaling is in progress.
 587 //
 588 // The C2I flavor takes a stock compiled call setup plus the target method in
 589 // Rmethod, marshals the arguments for an interpreted call and jumps to
 590 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
 591 // setup.  Compiled frames are fixed-size and the args are likely not in the
 592 // right place.  Hence all the args will likely be copied into the
 593 // interpreter's frame, forcing that frame to grow.  The compiled frame's
 594 // outgoing stack args will be dead after the copy.
 595 //
 596 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
 597 // also perform an offical frame push & pop.  They have a call to the native
 598 // routine in their middles and end in a return (instead of ending in a jump).
 599 // The native wrappers are stored in real nmethods instead of the BufferBlobs
 600 // used by the adapters.  The code generation happens here because it's very
 601 // similar to what the adapters have to do.
 602 
 603 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
 604   friend class AdapterHandlerTable;
 605 
 606  private:
 607   AdapterFingerPrint* _fingerprint;
 608   address _i2c_entry;
 609   address _c2i_entry;
 610   address _c2i_unverified_entry;
 611 
 612 #ifdef ASSERT
 613   // Captures code and signature used to generate this adapter when
 614   // verifing adapter equivalence.
 615   unsigned char* _saved_code;
 616   int            _code_length;
 617   BasicType*     _saved_sig;
 618   int            _total_args_passed;
 619 #endif
 620 
 621   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
 622     _fingerprint = fingerprint;
 623     _i2c_entry = i2c_entry;
 624     _c2i_entry = c2i_entry;
 625     _c2i_unverified_entry = c2i_unverified_entry;
 626 #ifdef ASSERT
 627     _saved_code = NULL;
 628     _code_length = 0;
 629     _saved_sig = NULL;
 630     _total_args_passed = 0;
 631 #endif
 632   }
 633 
 634   void deallocate();
 635 
 636   // should never be used
 637   AdapterHandlerEntry();
 638 
 639  public:
 640   address get_i2c_entry()            const { return _i2c_entry; }
 641   address get_c2i_entry()            const { return _c2i_entry; }
 642   address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
 643 
 644   address base_address();
 645   void relocate(address new_base);
 646 
 647   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
 648 
 649   AdapterHandlerEntry* next() {
 650     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
 651   }
 652 
 653 #ifdef ASSERT
 654   // Used to verify that code generated for shared adapters is equivalent
 655   void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
 656   bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
 657 #endif
 658 
 659   //virtual void print_on(outputStream* st) const;  DO NOT USE
 660   void print_adapter_on(outputStream* st) const;
 661 };
 662 
 663 class AdapterHandlerLibrary: public AllStatic {
 664  private:
 665   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
 666   static AdapterHandlerTable* _adapters;
 667   static AdapterHandlerEntry* _abstract_method_handler;
 668   static BufferBlob* buffer_blob();
 669   static void initialize();
 670 
 671  public:
 672 
 673   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
 674                                         address i2c_entry, address c2i_entry, address c2i_unverified_entry);
 675   static nmethod* create_native_wrapper(methodHandle method, int compile_id);
 676   static AdapterHandlerEntry* get_adapter(methodHandle method);
 677 
 678 #ifdef HAVE_DTRACE_H
 679   static nmethod* create_dtrace_nmethod (methodHandle method);
 680 #endif // HAVE_DTRACE_H
 681 
 682   static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
 683   static void print_handler_on(outputStream* st, CodeBlob* b);
 684   static bool contains(CodeBlob* b);
 685 #ifndef PRODUCT
 686   static void print_statistics();
 687 #endif /* PRODUCT */
 688 
 689 };
 690 
 691 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP