1 /*
   2  * Copyright (c) 1997, 2014, 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*        _wrong_method_abstract_blob;
  60   static RuntimeStub*        _ic_miss_blob;
  61   static RuntimeStub*        _resolve_opt_virtual_call_blob;
  62   static RuntimeStub*        _resolve_virtual_call_blob;
  63   static RuntimeStub*        _resolve_static_call_blob;
  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 
  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 #ifdef __SOFTFP__
 105   static jfloat  fadd(jfloat x, jfloat y);
 106   static jfloat  fsub(jfloat x, jfloat y);
 107   static jfloat  fmul(jfloat x, jfloat y);
 108   static jfloat  fdiv(jfloat x, jfloat y);
 109 
 110   static jdouble dadd(jdouble x, jdouble y);
 111   static jdouble dsub(jdouble x, jdouble y);
 112   static jdouble dmul(jdouble x, jdouble y);
 113   static jdouble ddiv(jdouble x, jdouble y);
 114 #endif // __SOFTFP__
 115 
 116   // float conversion (needs to set appropriate rounding mode)
 117   static jint    f2i (jfloat  x);
 118   static jlong   f2l (jfloat  x);
 119   static jint    d2i (jdouble x);
 120   static jlong   d2l (jdouble x);
 121   static jfloat  d2f (jdouble x);
 122   static jfloat  l2f (jlong   x);
 123   static jdouble l2d (jlong   x);
 124 
 125 #ifdef __SOFTFP__
 126   static jfloat  i2f (jint    x);
 127   static jdouble i2d (jint    x);
 128   static jdouble f2d (jfloat  x);
 129 #endif // __SOFTFP__
 130 
 131   // double trigonometrics and transcendentals
 132   static jdouble dsin(jdouble x);
 133   static jdouble dcos(jdouble x);
 134   static jdouble dtan(jdouble x);
 135   static jdouble dlog(jdouble x);
 136   static jdouble dlog10(jdouble x);
 137   static jdouble dexp(jdouble x);
 138   static jdouble dpow(jdouble x, jdouble y);
 139 
 140 #if defined(__SOFTFP__) || defined(E500V2)
 141   static double dabs(double f);
 142 #endif
 143 
 144 #if defined(__SOFTFP__) || defined(PPC32)
 145   static double dsqrt(double f);
 146 #endif
 147 
 148 #ifdef __SOFTFP__
 149   // C++ compiler generates soft float instructions as well as passing
 150   // float and double in registers.
 151   static int  fcmpl(float x, float y);
 152   static int  fcmpg(float x, float y);
 153   static int  dcmpl(double x, double y);
 154   static int  dcmpg(double x, double y);
 155 
 156   static int unordered_fcmplt(float x, float y);
 157   static int unordered_dcmplt(double x, double y);
 158   static int unordered_fcmple(float x, float y);
 159   static int unordered_dcmple(double x, double y);
 160   static int unordered_fcmpge(float x, float y);
 161   static int unordered_dcmpge(double x, double y);
 162   static int unordered_fcmpgt(float x, float y);
 163   static int unordered_dcmpgt(double x, double y);
 164 
 165   static float  fneg(float f);
 166   static double dneg(double f);
 167 #endif
 168 
 169   // exception handling across interpreter/compiler boundaries
 170   static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
 171   static address exception_handler_for_return_address(JavaThread* thread, address return_address);
 172 
 173 #if INCLUDE_ALL_GCS
 174   // G1 write barriers
 175   static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
 176   static void g1_wb_post(void* card_addr, JavaThread* thread);
 177 #endif // INCLUDE_ALL_GCS
 178 
 179   // exception handling and implicit exceptions
 180   static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
 181                                               bool force_unwind, bool top_frame_only);
 182   enum ImplicitExceptionKind {
 183     IMPLICIT_NULL,
 184     IMPLICIT_DIVIDE_BY_ZERO,
 185     STACK_OVERFLOW
 186   };
 187   static void    throw_AbstractMethodError(JavaThread* thread);
 188   static void    throw_IncompatibleClassChangeError(JavaThread* thread);
 189   static void    throw_ArithmeticException(JavaThread* thread);
 190   static void    throw_NullPointerException(JavaThread* thread);
 191   static void    throw_NullPointerException_at_call(JavaThread* thread);
 192   static void    throw_StackOverflowError(JavaThread* thread);
 193   static address continuation_for_implicit_exception(JavaThread* thread,
 194                                                      address faulting_pc,
 195                                                      ImplicitExceptionKind exception_kind);
 196 
 197   // Shared stub locations
 198   static address get_poll_stub(address pc);
 199 
 200   static address get_ic_miss_stub() {
 201     assert(_ic_miss_blob!= NULL, "oops");
 202     return _ic_miss_blob->entry_point();
 203   }
 204 
 205   static address get_handle_wrong_method_stub() {
 206     assert(_wrong_method_blob!= NULL, "oops");
 207     return _wrong_method_blob->entry_point();
 208   }
 209 
 210   static address get_handle_wrong_method_abstract_stub() {
 211     assert(_wrong_method_abstract_blob!= NULL, "oops");
 212     return _wrong_method_abstract_blob->entry_point();
 213   }
 214 
 215 #ifdef COMPILER2
 216   static void generate_uncommon_trap_blob(void);
 217   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
 218 #endif // COMPILER2
 219 
 220   static address get_resolve_opt_virtual_call_stub(){
 221     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
 222     return _resolve_opt_virtual_call_blob->entry_point();
 223   }
 224   static address get_resolve_virtual_call_stub() {
 225     assert(_resolve_virtual_call_blob != NULL, "oops");
 226     return _resolve_virtual_call_blob->entry_point();
 227   }
 228   static address get_resolve_static_call_stub() {
 229     assert(_resolve_static_call_blob != NULL, "oops");
 230     return _resolve_static_call_blob->entry_point();
 231   }
 232 
 233   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
 234   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
 235   static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }
 236 
 237   // Counters
 238 #ifndef PRODUCT
 239   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
 240 #endif // PRODUCT
 241 
 242   // Helper routine for full-speed JVMTI exception throwing support
 243   static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
 244   static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
 245 
 246   // RedefineClasses() tracing support for obsolete method entry
 247   static int rc_trace_method_entry(JavaThread* thread, Method* m);
 248 
 249   // To be used as the entry point for unresolved native methods.
 250   static address native_method_throw_unsatisfied_link_error_entry();
 251   static address native_method_throw_unsupported_operation_exception_entry();
 252 
 253   // bytecode tracing is only used by the TraceBytecodes
 254   static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
 255 
 256   static oop retrieve_receiver( Symbol* sig, frame caller );
 257 
 258   static void register_finalizer(JavaThread* thread, oopDesc* obj);
 259 
 260   // dtrace notifications
 261   static int dtrace_object_alloc(oopDesc* o, int size);
 262   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
 263   static int dtrace_method_entry(JavaThread* thread, Method* m);
 264   static int dtrace_method_exit(JavaThread* thread, Method* m);
 265 
 266   // jvmti notification
 267   static int jvmti_method_exit(JavaThread* thread, Method* m);
 268 
 269   // Utility method for retrieving the Java thread id, returns 0 if the
 270   // thread is not a well formed Java thread.
 271   static jlong get_java_tid(Thread* thread);
 272 
 273 
 274   // used by native wrappers to reenable yellow if overflow happened in native code
 275   static void reguard_yellow_pages();
 276 
 277   /**
 278    * Fill in the "X cannot be cast to a Y" message for ClassCastException
 279    *
 280    * @param thr the current thread
 281    * @param name the name of the class of the object attempted to be cast
 282    * @return the dynamically allocated exception message (must be freed
 283    * by the caller using a resource mark)
 284    *
 285    * BCP must refer to the current 'checkcast' opcode for the frame
 286    * on top of the stack.
 287    * The caller (or one of it's callers) must use a ResourceMark
 288    * in order to correctly free the result.
 289    */
 290   static char* generate_class_cast_message(JavaThread* thr, const char* name);
 291 
 292   /**
 293    * Fill in the "X cannot be cast to a Y" message for ClassCastException
 294    *
 295    * @param name the name of the class of the object attempted to be cast
 296    * @param klass the name of the target klass attempt
 297    * @param gripe the specific kind of problem being reported
 298    * @return the dynamically allocated exception message (must be freed
 299    * by the caller using a resource mark)
 300    *
 301    * This version does not require access the frame, so it can be called
 302    * from interpreted code
 303    * The caller (or one of it's callers) must use a ResourceMark
 304    * in order to correctly free the result.
 305    */
 306   static char* generate_class_cast_message(const char* name, const char* klass,
 307                                            const char* gripe = " cannot be cast to ");
 308 
 309   // Resolves a call site- may patch in the destination of the call into the
 310   // compiled code.
 311   static methodHandle resolve_helper(JavaThread *thread,
 312                                      bool is_virtual,
 313                                      bool is_optimized, TRAPS);
 314 
 315   private:
 316   // deopt blob
 317   static void generate_deopt_blob(void);
 318 
 319   public:
 320   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
 321 
 322   // Resets a call-site in compiled code so it will get resolved again.
 323   static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
 324 
 325   // In the code prolog, if the klass comparison fails, the inline cache
 326   // misses and the call site is patched to megamorphic
 327   static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
 328 
 329   // Find the method that called us.
 330   static methodHandle find_callee_method(JavaThread* thread, TRAPS);
 331 
 332 
 333  private:
 334   static Handle find_callee_info(JavaThread* thread,
 335                                  Bytecodes::Code& bc,
 336                                  CallInfo& callinfo, TRAPS);
 337   static Handle find_callee_info_helper(JavaThread* thread,
 338                                         vframeStream& vfst,
 339                                         Bytecodes::Code& bc,
 340                                         CallInfo& callinfo, TRAPS);
 341 
 342   static address clean_virtual_call_entry();
 343   static address clean_opt_virtual_call_entry();
 344   static address clean_static_call_entry();
 345 
 346  public:
 347 
 348   // Read the array of BasicTypes from a Java signature, and compute where
 349   // compiled Java code would like to put the results.  Values in reg_lo and
 350   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
 351   // registers, those above refer to 4-byte stack slots.  All stack slots are
 352   // based off of the window top.  SharedInfo::stack0 refers to the first usable
 353   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
 354   // 4-bytes higher. So for sparc because the register window save area is at
 355   // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
 356   // will be just above it. (
 357   // return value is the maximum number of VMReg stack slots the convention will use.
 358   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
 359 
 360   static void check_member_name_argument_is_last_argument(methodHandle method,
 361                                                           const BasicType* sig_bt,
 362                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
 363 
 364   // Ditto except for calling C
 365   //
 366   // C argument in register AND stack slot.
 367   // Some architectures require that an argument must be passed in a register
 368   // AND in a stack slot. These architectures provide a second VMRegPair array
 369   // to be filled by the c_calling_convention method. On other architectures,
 370   // NULL is being passed as the second VMRegPair array, so arguments are either
 371   // passed in a register OR in a stack slot.
 372   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
 373                                   int total_args_passed);
 374 
 375   // Compute the new number of arguments in the signature if 32 bit ints
 376   // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
 377   // is true.
 378   static int  convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
 379   // Adapt a method's signature if it contains 32 bit integers that must
 380   // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
 381   // is true.
 382   static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
 383                                        BasicType*& in_sig_bt, VMRegPair*& in_regs);
 384 
 385   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
 386   // blobs. Unlike adapters in the tiger and earlier releases the code in these
 387   // blobs does not create a new frame and are therefore virtually invisible
 388   // to the stack walking code. In general these blobs extend the callers stack
 389   // as needed for the conversion of argument locations.
 390 
 391   // When calling a c2i blob the code will always call the interpreter even if
 392   // by the time we reach the blob there is compiled code available. This allows
 393   // the blob to pass the incoming stack pointer (the sender sp) in a known
 394   // location for the interpreter to record. This is used by the frame code
 395   // to correct the sender code to match up with the stack pointer when the
 396   // thread left the compiled code. In addition it allows the interpreter
 397   // to remove the space the c2i adapter allocated to do its argument conversion.
 398 
 399   // Although a c2i blob will always run interpreted even if compiled code is
 400   // present if we see that compiled code is present the compiled call site
 401   // will be patched/re-resolved so that later calls will run compiled.
 402 
 403   // Additionally a c2i blob need to have a unverified entry because it can be reached
 404   // in situations where the call site is an inlined cache site and may go megamorphic.
 405 
 406   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
 407   // that the interpreter before it does any call dispatch will record the current
 408   // stack pointer in the interpreter frame. On return it will restore the stack
 409   // pointer as needed. This means the i2c adapter code doesn't need any special
 410   // handshaking path with compiled code to keep the stack walking correct.
 411 
 412   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
 413                                                       int total_args_passed,
 414                                                       int max_arg,
 415                                                       const BasicType *sig_bt,
 416                                                       const VMRegPair *regs,
 417                                                       AdapterFingerPrint* fingerprint);
 418 
 419   // OSR support
 420 
 421   // OSR_migration_begin will extract the jvm state from an interpreter
 422   // frame (locals, monitors) and store the data in a piece of C heap
 423   // storage. This then allows the interpreter frame to be removed from the
 424   // stack and the OSR nmethod to be called. That method is called with a
 425   // pointer to the C heap storage. This pointer is the return value from
 426   // OSR_migration_begin.
 427 
 428   static intptr_t* OSR_migration_begin( JavaThread *thread);
 429 
 430   // OSR_migration_end is a trivial routine. It is called after the compiled
 431   // method has extracted the jvm state from the C heap that OSR_migration_begin
 432   // created. It's entire job is to simply free this storage.
 433   static void      OSR_migration_end  ( intptr_t* buf);
 434 
 435   // Convert a sig into a calling convention register layout
 436   // and find interesting things about it.
 437   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
 438   static VMReg     name_for_receiver();
 439 
 440   // "Top of Stack" slots that may be unused by the calling convention but must
 441   // otherwise be preserved.
 442   // On Intel these are not necessary and the value can be zero.
 443   // On Sparc this describes the words reserved for storing a register window
 444   // when an interrupt occurs.
 445   static uint out_preserve_stack_slots();
 446 
 447   // Is vector's size (in bytes) bigger than a size saved by default?
 448   // For example, on x86 16 bytes XMM registers are saved by default.
 449   static bool is_wide_vector(int size);
 450 
 451   // Save and restore a native result
 452   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
 453   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
 454 
 455   // Generate a native wrapper for a given method.  The method takes arguments
 456   // in the Java compiled code convention, marshals them to the native
 457   // convention (handlizes oops, etc), transitions to native, makes the call,
 458   // returns to java state (possibly blocking), unhandlizes any result and
 459   // returns.
 460   //
 461   // The wrapper may contain special-case code if the given method
 462   // is a JNI critical method, or a compiled method handle adapter,
 463   // such as _invokeBasic, _linkToVirtual, etc.
 464   static nmethod* generate_native_wrapper(MacroAssembler* masm,
 465                                           methodHandle method,
 466                                           int compile_id,
 467                                           BasicType* sig_bt,
 468                                           VMRegPair* regs,
 469                                           BasicType ret_type );
 470 
 471   // Block before entering a JNI critical method
 472   static void block_for_jni_critical(JavaThread* thread);
 473 
 474 #ifdef HAVE_DTRACE_H
 475   // Generate a dtrace wrapper for a given method.  The method takes arguments
 476   // in the Java compiled code convention, marshals them to the native
 477   // convention (handlizes oops, etc), transitions to native, makes the call,
 478   // returns to java state (possibly blocking), unhandlizes any result and
 479   // returns.
 480   static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
 481                                           methodHandle method);
 482 
 483   // dtrace support to convert a Java string to utf8
 484   static void get_utf(oopDesc* src, address dst);
 485 #endif // def HAVE_DTRACE_H
 486 
 487   // A compiled caller has just called the interpreter, but compiled code
 488   // exists.  Patch the caller so he no longer calls into the interpreter.
 489   static void fixup_callers_callsite(Method* moop, address ret_pc);
 490 
 491   // Slow-path Locking and Unlocking
 492   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 493   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
 494 
 495   // Resolving of calls
 496   static address resolve_static_call_C     (JavaThread *thread);
 497   static address resolve_virtual_call_C    (JavaThread *thread);
 498   static address resolve_opt_virtual_call_C(JavaThread *thread);
 499 
 500   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
 501   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
 502                                oopDesc* dest, jint dest_pos,
 503                                jint length, JavaThread* thread);
 504 
 505   // handle ic miss with caller being compiled code
 506   // wrong method handling (inline cache misses, zombie methods)
 507   static address handle_wrong_method(JavaThread* thread);
 508   static address handle_wrong_method_abstract(JavaThread* thread);
 509   static address handle_wrong_method_ic_miss(JavaThread* thread);
 510 
 511 #ifndef PRODUCT
 512 
 513   // Collect and print inline cache miss statistics
 514  private:
 515   enum { maxICmiss_count = 100 };
 516   static int     _ICmiss_index;                  // length of IC miss histogram
 517   static int     _ICmiss_count[maxICmiss_count]; // miss counts
 518   static address _ICmiss_at[maxICmiss_count];    // miss addresses
 519   static void trace_ic_miss(address at);
 520 
 521  public:
 522   static int _monitor_enter_ctr;                 // monitor enter slow
 523   static int _monitor_exit_ctr;                  // monitor exit slow
 524   static int _throw_null_ctr;                    // throwing a null-pointer exception
 525   static int _ic_miss_ctr;                       // total # of IC misses
 526   static int _wrong_method_ctr;
 527   static int _resolve_static_ctr;
 528   static int _resolve_virtual_ctr;
 529   static int _resolve_opt_virtual_ctr;
 530   static int _implicit_null_throws;
 531   static int _implicit_div0_throws;
 532 
 533   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
 534   static int _jshort_array_copy_ctr;       // Slow-path short array copy
 535   static int _jint_array_copy_ctr;         // Slow-path int array copy
 536   static int _jlong_array_copy_ctr;        // Slow-path long array copy
 537   static int _oop_array_copy_ctr;          // Slow-path oop array copy
 538   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
 539   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
 540   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
 541   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
 542 
 543   static int _new_instance_ctr;            // 'new' object requires GC
 544   static int _new_array_ctr;               // 'new' array requires GC
 545   static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
 546   static int _find_handler_ctr;            // find exception handler
 547   static int _rethrow_ctr;                 // rethrow exception
 548   static int _mon_enter_stub_ctr;          // monitor enter stub
 549   static int _mon_exit_stub_ctr;           // monitor exit stub
 550   static int _mon_enter_ctr;               // monitor enter slow
 551   static int _mon_exit_ctr;                // monitor exit slow
 552   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
 553 
 554   // Statistics code
 555   // stats for "normal" compiled calls (non-interface)
 556   static int     _nof_normal_calls;              // total # of calls
 557   static int     _nof_optimized_calls;           // total # of statically-bound calls
 558   static int     _nof_inlined_calls;             // total # of inlined normal calls
 559   static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)
 560   static int     _nof_inlined_static_calls;      // total # of inlined static calls
 561   // stats for compiled interface calls
 562   static int     _nof_interface_calls;           // total # of compiled calls
 563   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
 564   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
 565   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
 566   // stats for runtime exceptions
 567   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
 568 
 569  public: // for compiler
 570   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
 571   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
 572   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
 573   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
 574   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
 575   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
 576   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
 577   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
 578   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
 579   static void print_call_statistics(int comp_total);
 580   static void print_statistics();
 581   static void print_ic_miss_histogram();
 582 
 583 #endif // PRODUCT
 584 };
 585 
 586 
 587 // ---------------------------------------------------------------------------
 588 // Implementation of AdapterHandlerLibrary
 589 //
 590 // This library manages argument marshaling adapters and native wrappers.
 591 // There are 2 flavors of adapters: I2C and C2I.
 592 //
 593 // The I2C flavor takes a stock interpreted call setup, marshals the
 594 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
 595 // code_begin().  It is broken to call it without an nmethod assigned.
 596 // The usual behavior is to lift any register arguments up out of the
 597 // stack and possibly re-pack the extra arguments to be contiguous.
 598 // I2C adapters will save what the interpreter's stack pointer will be
 599 // after arguments are popped, then adjust the interpreter's frame
 600 // size to force alignment and possibly to repack the arguments.
 601 // After re-packing, it jumps to the compiled code start.  There are
 602 // no safepoints in this adapter code and a GC cannot happen while
 603 // marshaling is in progress.
 604 //
 605 // The C2I flavor takes a stock compiled call setup plus the target method in
 606 // Rmethod, marshals the arguments for an interpreted call and jumps to
 607 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
 608 // setup.  Compiled frames are fixed-size and the args are likely not in the
 609 // right place.  Hence all the args will likely be copied into the
 610 // interpreter's frame, forcing that frame to grow.  The compiled frame's
 611 // outgoing stack args will be dead after the copy.
 612 //
 613 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
 614 // also perform an official frame push & pop.  They have a call to the native
 615 // routine in their middles and end in a return (instead of ending in a jump).
 616 // The native wrappers are stored in real nmethods instead of the BufferBlobs
 617 // used by the adapters.  The code generation happens here because it's very
 618 // similar to what the adapters have to do.
 619 
 620 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
 621   friend class AdapterHandlerTable;
 622 
 623  private:
 624   AdapterFingerPrint* _fingerprint;
 625   address _i2c_entry;
 626   address _c2i_entry;
 627   address _c2i_unverified_entry;
 628 
 629 #ifdef ASSERT
 630   // Captures code and signature used to generate this adapter when
 631   // verifying adapter equivalence.
 632   unsigned char* _saved_code;
 633   int            _saved_code_length;
 634 #endif
 635 
 636   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
 637     _fingerprint = fingerprint;
 638     _i2c_entry = i2c_entry;
 639     _c2i_entry = c2i_entry;
 640     _c2i_unverified_entry = c2i_unverified_entry;
 641 #ifdef ASSERT
 642     _saved_code = NULL;
 643     _saved_code_length = 0;
 644 #endif
 645   }
 646 
 647   void deallocate();
 648 
 649   // should never be used
 650   AdapterHandlerEntry();
 651 
 652  public:
 653   address get_i2c_entry()            const { return _i2c_entry; }
 654   address get_c2i_entry()            const { return _c2i_entry; }
 655   address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
 656   address base_address();
 657   void relocate(address new_base);
 658 
 659   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
 660 
 661   AdapterHandlerEntry* next() {
 662     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
 663   }
 664 
 665 #ifdef ASSERT
 666   // Used to verify that code generated for shared adapters is equivalent
 667   void save_code   (unsigned char* code, int length);
 668   bool compare_code(unsigned char* code, int length);
 669 #endif
 670 
 671   //virtual void print_on(outputStream* st) const;  DO NOT USE
 672   void print_adapter_on(outputStream* st) const;
 673 };
 674 
 675 class AdapterHandlerLibrary: public AllStatic {
 676  private:
 677   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
 678   static AdapterHandlerTable* _adapters;
 679   static AdapterHandlerEntry* _abstract_method_handler;
 680   static BufferBlob* buffer_blob();
 681   static void initialize();
 682 
 683  public:
 684 
 685   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
 686                                         address i2c_entry, address c2i_entry, address c2i_unverified_entry);
 687   static void create_native_wrapper(methodHandle method);
 688   static AdapterHandlerEntry* get_adapter(methodHandle method);
 689 
 690 #ifdef HAVE_DTRACE_H
 691   static nmethod* create_dtrace_nmethod (methodHandle method);
 692 #endif // HAVE_DTRACE_H
 693 
 694   static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
 695   static void print_handler_on(outputStream* st, CodeBlob* b);
 696   static bool contains(CodeBlob* b);
 697 #ifndef PRODUCT
 698   static void print_statistics();
 699 #endif /* PRODUCT */
 700 
 701 };
 702 
 703 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP