1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
  26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
  27 
  28 #include "interpreter/bytecodeHistogram.hpp"
  29 #include "interpreter/bytecodeTracer.hpp"
  30 #include "interpreter/linkResolver.hpp"
  31 #include "memory/allocation.hpp"
  32 #include "memory/resourceArea.hpp"
  33 #include "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   // Montgomery multiplication
 149   static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
 150                                   jint len, jlong inv, jint *m_ints);
 151   static void montgomery_square(jint *a_ints, jint *n_ints,
 152                                 jint len, jlong inv, jint *m_ints);
 153 
 154 #ifdef __SOFTFP__
 155   // C++ compiler generates soft float instructions as well as passing
 156   // float and double in registers.
 157   static int  fcmpl(float x, float y);
 158   static int  fcmpg(float x, float y);
 159   static int  dcmpl(double x, double y);
 160   static int  dcmpg(double x, double y);
 161 
 162   static int unordered_fcmplt(float x, float y);
 163   static int unordered_dcmplt(double x, double y);
 164   static int unordered_fcmple(float x, float y);
 165   static int unordered_dcmple(double x, double y);
 166   static int unordered_fcmpge(float x, float y);
 167   static int unordered_dcmpge(double x, double y);
 168   static int unordered_fcmpgt(float x, float y);
 169   static int unordered_dcmpgt(double x, double y);
 170 
 171   static float  fneg(float f);
 172   static double dneg(double f);
 173 #endif
 174 
 175   // exception handling across interpreter/compiler boundaries
 176   static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
 177   static address exception_handler_for_return_address(JavaThread* thread, address return_address);
 178 
 179 #if INCLUDE_ALL_GCS
 180   // G1 write barriers
 181   static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
 182   static void g1_wb_post(void* card_addr, JavaThread* thread);
 183 #endif // INCLUDE_ALL_GCS
 184 
 185   // exception handling and implicit exceptions
 186   static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
 187                                               bool force_unwind, bool top_frame_only);
 188   enum ImplicitExceptionKind {
 189     IMPLICIT_NULL,
 190     IMPLICIT_DIVIDE_BY_ZERO,
 191     STACK_OVERFLOW
 192   };
 193   static void    throw_AbstractMethodError(JavaThread* thread);
 194   static void    throw_IncompatibleClassChangeError(JavaThread* thread);
 195   static void    throw_ArithmeticException(JavaThread* thread);
 196   static void    throw_NullPointerException(JavaThread* thread);
 197   static void    throw_NullPointerException_at_call(JavaThread* thread);
 198   static void    throw_StackOverflowError(JavaThread* thread);
 199   static address continuation_for_implicit_exception(JavaThread* thread,
 200                                                      address faulting_pc,
 201                                                      ImplicitExceptionKind exception_kind);



 202 
 203   // Shared stub locations
 204   static address get_poll_stub(address pc);
 205 
 206   static address get_ic_miss_stub() {
 207     assert(_ic_miss_blob!= NULL, "oops");
 208     return _ic_miss_blob->entry_point();
 209   }
 210 
 211   static address get_handle_wrong_method_stub() {
 212     assert(_wrong_method_blob!= NULL, "oops");
 213     return _wrong_method_blob->entry_point();
 214   }
 215 
 216   static address get_handle_wrong_method_abstract_stub() {
 217     assert(_wrong_method_abstract_blob!= NULL, "oops");
 218     return _wrong_method_abstract_blob->entry_point();
 219   }
 220 
 221 #ifdef COMPILER2
 222   static void generate_uncommon_trap_blob(void);
 223   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
 224 #endif // COMPILER2
 225 
 226   static address get_resolve_opt_virtual_call_stub() {
 227     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
 228     return _resolve_opt_virtual_call_blob->entry_point();
 229   }
 230   static address get_resolve_virtual_call_stub() {
 231     assert(_resolve_virtual_call_blob != NULL, "oops");
 232     return _resolve_virtual_call_blob->entry_point();
 233   }
 234   static address get_resolve_static_call_stub() {
 235     assert(_resolve_static_call_blob != NULL, "oops");
 236     return _resolve_static_call_blob->entry_point();
 237   }
 238 
 239   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
 240   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
 241   static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }
 242 
 243   // Counters
 244 #ifndef PRODUCT
 245   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
 246 #endif // PRODUCT
 247 
 248   // Helper routine for full-speed JVMTI exception throwing support
 249   static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
 250   static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
 251 
 252   // RedefineClasses() tracing support for obsolete method entry
 253   static int rc_trace_method_entry(JavaThread* thread, Method* m);
 254 
 255   // To be used as the entry point for unresolved native methods.
 256   static address native_method_throw_unsatisfied_link_error_entry();
 257   static address native_method_throw_unsupported_operation_exception_entry();
 258 
 259   // bytecode tracing is only used by the TraceBytecodes
 260   static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
 261 
 262   static oop retrieve_receiver(Symbol* sig, frame caller);
 263 
 264   static void register_finalizer(JavaThread* thread, oopDesc* obj);
 265 
 266   // dtrace notifications
 267   static int dtrace_object_alloc(oopDesc* o, int size);
 268   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
 269   static int dtrace_method_entry(JavaThread* thread, Method* m);
 270   static int dtrace_method_exit(JavaThread* thread, Method* m);
 271 
 272   // Utility method for retrieving the Java thread id, returns 0 if the
 273   // thread is not a well formed Java thread.
 274   static jlong get_java_tid(Thread* thread);
 275 
 276 
 277   // used by native wrappers to reenable yellow if overflow happened in native code
 278   static void reguard_yellow_pages();
 279 
 280   // Fill in the "X cannot be cast to a Y" message for ClassCastException
 281   //
 282   // @param thr the current thread
 283   // @param name the name of the class of the object attempted to be cast
 284   // @return the dynamically allocated exception message (must be freed
 285   // by the caller using a resource mark)
 286   //
 287   // BCP must refer to the current 'checkcast' opcode for the frame
 288   // on top of the stack.
 289   // The caller (or one of it's callers) must use a ResourceMark
 290   // in order to correctly free the result.
 291   //
 292   static char* generate_class_cast_message(JavaThread* thr, const char* name);
 293 
 294   // Fill in the "X cannot be cast to a Y" message for ClassCastException
 295   //
 296   // @param name the name of the class of the object attempted to be cast
 297   // @param klass the name of the target klass attempt
 298   // @param gripe the specific kind of problem being reported
 299   // @return the dynamically allocated exception message (must be freed
 300   // by the caller using a resource mark)
 301   //
 302   // This version does not require access the frame, so it can be called
 303   // from interpreted code
 304   // The caller (or one of it's callers) must use a ResourceMark
 305   // in order to correctly free the result.
 306   //
 307   static char* generate_class_cast_message(const char* name, const char* klass,
 308                                            const char* gripe = " cannot be cast to ");
 309 
 310   // Resolves a call site- may patch in the destination of the call into the
 311   // compiled code.
 312   static methodHandle resolve_helper(JavaThread *thread,
 313                                      bool is_virtual,
 314                                      bool is_optimized, TRAPS);
 315 
 316  private:
 317   // deopt blob
 318   static void generate_deopt_blob(void);
 319 
 320  public:
 321   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
 322 
 323   // Resets a call-site in compiled code so it will get resolved again.
 324   static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
 325 
 326   // In the code prolog, if the klass comparison fails, the inline cache
 327   // misses and the call site is patched to megamorphic
 328   static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
 329 
 330   // Find the method that called us.
 331   static methodHandle find_callee_method(JavaThread* thread, TRAPS);
 332 
 333 
 334  private:
 335   static Handle find_callee_info(JavaThread* thread,
 336                                  Bytecodes::Code& bc,
 337                                  CallInfo& callinfo, TRAPS);
 338   static Handle find_callee_info_helper(JavaThread* thread,
 339                                         vframeStream& vfst,
 340                                         Bytecodes::Code& bc,
 341                                         CallInfo& callinfo, TRAPS);
 342 
 343   static address clean_virtual_call_entry();
 344   static address clean_opt_virtual_call_entry();
 345   static address clean_static_call_entry();
 346 
 347  public:
 348 
 349   // Read the array of BasicTypes from a Java signature, and compute where
 350   // compiled Java code would like to put the results.  Values in reg_lo and
 351   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
 352   // registers, those above refer to 4-byte stack slots.  All stack slots are
 353   // based off of the window top.  SharedInfo::stack0 refers to the first usable
 354   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
 355   // 4-bytes higher. So for sparc because the register window save area is at
 356   // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
 357   // will be just above it. (
 358   // return value is the maximum number of VMReg stack slots the convention will use.
 359   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
 360 
 361   static void check_member_name_argument_is_last_argument(methodHandle method,
 362                                                           const BasicType* sig_bt,
 363                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
 364 
 365   // Ditto except for calling C
 366   //
 367   // C argument in register AND stack slot.
 368   // Some architectures require that an argument must be passed in a register
 369   // AND in a stack slot. These architectures provide a second VMRegPair array
 370   // to be filled by the c_calling_convention method. On other architectures,
 371   // NULL is being passed as the second VMRegPair array, so arguments are either
 372   // passed in a register OR in a stack slot.
 373   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
 374                                   int total_args_passed);
 375 
 376   // Compute the new number of arguments in the signature if 32 bit ints
 377   // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
 378   // is true.
 379   static int  convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
 380   // Adapt a method's signature if it contains 32 bit integers that must
 381   // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
 382   // is true.
 383   static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
 384                                        BasicType*& in_sig_bt, VMRegPair*& in_regs);
 385 
 386   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
 387   // blobs. Unlike adapters in the tiger and earlier releases the code in these
 388   // blobs does not create a new frame and are therefore virtually invisible
 389   // to the stack walking code. In general these blobs extend the callers stack
 390   // as needed for the conversion of argument locations.
 391 
 392   // When calling a c2i blob the code will always call the interpreter even if
 393   // by the time we reach the blob there is compiled code available. This allows
 394   // the blob to pass the incoming stack pointer (the sender sp) in a known
 395   // location for the interpreter to record. This is used by the frame code
 396   // to correct the sender code to match up with the stack pointer when the
 397   // thread left the compiled code. In addition it allows the interpreter
 398   // to remove the space the c2i adapter allocated to do its argument conversion.
 399 
 400   // Although a c2i blob will always run interpreted even if compiled code is
 401   // present if we see that compiled code is present the compiled call site
 402   // will be patched/re-resolved so that later calls will run compiled.
 403 
 404   // Additionally a c2i blob need to have a unverified entry because it can be reached
 405   // in situations where the call site is an inlined cache site and may go megamorphic.
 406 
 407   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
 408   // that the interpreter before it does any call dispatch will record the current
 409   // stack pointer in the interpreter frame. On return it will restore the stack
 410   // pointer as needed. This means the i2c adapter code doesn't need any special
 411   // handshaking path with compiled code to keep the stack walking correct.
 412 
 413   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
 414                                                       int total_args_passed,
 415                                                       int max_arg,
 416                                                       const BasicType *sig_bt,
 417                                                       const VMRegPair *regs,
 418                                                       AdapterFingerPrint* fingerprint);
 419 






 420   // OSR support
 421 
 422   // OSR_migration_begin will extract the jvm state from an interpreter
 423   // frame (locals, monitors) and store the data in a piece of C heap
 424   // storage. This then allows the interpreter frame to be removed from the
 425   // stack and the OSR nmethod to be called. That method is called with a
 426   // pointer to the C heap storage. This pointer is the return value from
 427   // OSR_migration_begin.
 428 
 429   static intptr_t* OSR_migration_begin(JavaThread *thread);
 430 
 431   // OSR_migration_end is a trivial routine. It is called after the compiled
 432   // method has extracted the jvm state from the C heap that OSR_migration_begin
 433   // created. It's entire job is to simply free this storage.
 434   static void OSR_migration_end(intptr_t* buf);
 435 
 436   // Convert a sig into a calling convention register layout
 437   // and find interesting things about it.
 438   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
 439   static VMReg name_for_receiver();
 440 
 441   // "Top of Stack" slots that may be unused by the calling convention but must
 442   // otherwise be preserved.
 443   // On Intel these are not necessary and the value can be zero.
 444   // On Sparc this describes the words reserved for storing a register window
 445   // when an interrupt occurs.
 446   static uint out_preserve_stack_slots();
 447 
 448   // Is vector's size (in bytes) bigger than a size saved by default?
 449   // For example, on x86 16 bytes XMM registers are saved by default.
 450   static bool is_wide_vector(int size);
 451 
 452   // Save and restore a native result
 453   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
 454   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
 455 
 456   // Generate a native wrapper for a given method.  The method takes arguments
 457   // in the Java compiled code convention, marshals them to the native
 458   // convention (handlizes oops, etc), transitions to native, makes the call,
 459   // returns to java state (possibly blocking), unhandlizes any result and
 460   // returns.
 461   //
 462   // The wrapper may contain special-case code if the given method
 463   // is a JNI critical method, or a compiled method handle adapter,
 464   // such as _invokeBasic, _linkToVirtual, etc.
 465   static nmethod* generate_native_wrapper(MacroAssembler* masm,
 466                                           methodHandle method,
 467                                           int compile_id,
 468                                           BasicType* sig_bt,
 469                                           VMRegPair* regs,
 470                                           BasicType ret_type);
 471 
 472   // Block before entering a JNI critical method
 473   static void block_for_jni_critical(JavaThread* thread);
 474 
 475   // A compiled caller has just called the interpreter, but compiled code
 476   // exists.  Patch the caller so he no longer calls into the interpreter.
 477   static void fixup_callers_callsite(Method* moop, address ret_pc);

 478 
 479   // Slow-path Locking and Unlocking
 480   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 481   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 482 
 483   // Resolving of calls
 484   static address resolve_static_call_C     (JavaThread *thread);
 485   static address resolve_virtual_call_C    (JavaThread *thread);
 486   static address resolve_opt_virtual_call_C(JavaThread *thread);
 487 
 488   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
 489   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
 490                                oopDesc* dest, jint dest_pos,
 491                                jint length, JavaThread* thread);
 492 
 493   // handle ic miss with caller being compiled code
 494   // wrong method handling (inline cache misses, zombie methods)
 495   static address handle_wrong_method(JavaThread* thread);
 496   static address handle_wrong_method_abstract(JavaThread* thread);
 497   static address handle_wrong_method_ic_miss(JavaThread* thread);
 498 
 499 #ifndef PRODUCT
 500 
 501   // Collect and print inline cache miss statistics
 502  private:
 503   enum { maxICmiss_count = 100 };
 504   static int     _ICmiss_index;                  // length of IC miss histogram
 505   static int     _ICmiss_count[maxICmiss_count]; // miss counts
 506   static address _ICmiss_at[maxICmiss_count];    // miss addresses
 507   static void trace_ic_miss(address at);
 508 
 509  public:
 510   static int _throw_null_ctr;                    // throwing a null-pointer exception
 511   static int _ic_miss_ctr;                       // total # of IC misses
 512   static int _wrong_method_ctr;
 513   static int _resolve_static_ctr;
 514   static int _resolve_virtual_ctr;
 515   static int _resolve_opt_virtual_ctr;
 516   static int _implicit_null_throws;
 517   static int _implicit_div0_throws;
 518 
 519   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
 520   static int _jshort_array_copy_ctr;       // Slow-path short array copy
 521   static int _jint_array_copy_ctr;         // Slow-path int array copy
 522   static int _jlong_array_copy_ctr;        // Slow-path long array copy
 523   static int _oop_array_copy_ctr;          // Slow-path oop array copy
 524   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
 525   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
 526   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
 527   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
 528 
 529   static int _new_instance_ctr;            // 'new' object requires GC
 530   static int _new_array_ctr;               // 'new' array requires GC
 531   static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
 532   static int _find_handler_ctr;            // find exception handler
 533   static int _rethrow_ctr;                 // rethrow exception
 534   static int _mon_enter_stub_ctr;          // monitor enter stub
 535   static int _mon_exit_stub_ctr;           // monitor exit stub
 536   static int _mon_enter_ctr;               // monitor enter slow
 537   static int _mon_exit_ctr;                // monitor exit slow
 538   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
 539 
 540   // Statistics code
 541   // stats for "normal" compiled calls (non-interface)
 542   static int     _nof_normal_calls;              // total # of calls
 543   static int     _nof_optimized_calls;           // total # of statically-bound calls
 544   static int     _nof_inlined_calls;             // total # of inlined normal calls
 545   static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)
 546   static int     _nof_inlined_static_calls;      // total # of inlined static calls
 547   // stats for compiled interface calls
 548   static int     _nof_interface_calls;           // total # of compiled calls
 549   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
 550   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
 551   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
 552   // stats for runtime exceptions
 553   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
 554 
 555  public: // for compiler
 556   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
 557   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
 558   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
 559   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
 560   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
 561   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
 562   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
 563   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
 564   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
 565   static void print_call_statistics(int comp_total);
 566   static void print_statistics();
 567   static void print_ic_miss_histogram();
 568 
 569 #endif // PRODUCT
 570 };
 571 
 572 
 573 // ---------------------------------------------------------------------------
 574 // Implementation of AdapterHandlerLibrary
 575 //
 576 // This library manages argument marshaling adapters and native wrappers.
 577 // There are 2 flavors of adapters: I2C and C2I.
 578 //
 579 // The I2C flavor takes a stock interpreted call setup, marshals the
 580 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
 581 // code_begin().  It is broken to call it without an nmethod assigned.
 582 // The usual behavior is to lift any register arguments up out of the
 583 // stack and possibly re-pack the extra arguments to be contiguous.
 584 // I2C adapters will save what the interpreter's stack pointer will be
 585 // after arguments are popped, then adjust the interpreter's frame
 586 // size to force alignment and possibly to repack the arguments.
 587 // After re-packing, it jumps to the compiled code start.  There are
 588 // no safepoints in this adapter code and a GC cannot happen while
 589 // marshaling is in progress.
 590 //
 591 // The C2I flavor takes a stock compiled call setup plus the target method in
 592 // Rmethod, marshals the arguments for an interpreted call and jumps to
 593 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
 594 // setup.  Compiled frames are fixed-size and the args are likely not in the
 595 // right place.  Hence all the args will likely be copied into the
 596 // interpreter's frame, forcing that frame to grow.  The compiled frame's
 597 // outgoing stack args will be dead after the copy.
 598 //
 599 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
 600 // also perform an official frame push & pop.  They have a call to the native
 601 // routine in their middles and end in a return (instead of ending in a jump).
 602 // The native wrappers are stored in real nmethods instead of the BufferBlobs
 603 // used by the adapters.  The code generation happens here because it's very
 604 // similar to what the adapters have to do.
 605 
 606 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
 607   friend class AdapterHandlerTable;
 608 
 609  private:
 610   AdapterFingerPrint* _fingerprint;
 611   address _i2c_entry;
 612   address _c2i_entry;
 613   address _c2i_unverified_entry;
 614 
 615 #ifdef ASSERT
 616   // Captures code and signature used to generate this adapter when
 617   // verifying adapter equivalence.
 618   unsigned char* _saved_code;
 619   int            _saved_code_length;
 620 #endif
 621 
 622   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
 623     _fingerprint = fingerprint;
 624     _i2c_entry = i2c_entry;
 625     _c2i_entry = c2i_entry;
 626     _c2i_unverified_entry = c2i_unverified_entry;
 627 #ifdef ASSERT
 628     _saved_code = NULL;
 629     _saved_code_length = 0;
 630 #endif
 631   }
 632 
 633   void deallocate();
 634 
 635   // should never be used
 636   AdapterHandlerEntry();
 637 
 638  public:
 639   address get_i2c_entry()            const { return _i2c_entry; }
 640   address get_c2i_entry()            const { return _c2i_entry; }
 641   address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
 642   address base_address();
 643   void relocate(address new_base);
 644 
 645   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
 646 
 647   AdapterHandlerEntry* next() {
 648     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
 649   }
 650 
 651 #ifdef ASSERT
 652   // Used to verify that code generated for shared adapters is equivalent
 653   void save_code   (unsigned char* code, int length);
 654   bool compare_code(unsigned char* code, int length);
 655 #endif
 656 
 657   //virtual void print_on(outputStream* st) const;  DO NOT USE
 658   void print_adapter_on(outputStream* st) const;
 659 };
 660 
 661 class AdapterHandlerLibrary: public AllStatic {
 662  private:
 663   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
 664   static AdapterHandlerTable* _adapters;
 665   static AdapterHandlerEntry* _abstract_method_handler;
 666   static BufferBlob* buffer_blob();
 667   static void initialize();
 668 
 669  public:
 670 
 671   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
 672                                         address i2c_entry, address c2i_entry, address c2i_unverified_entry);
 673   static void create_native_wrapper(methodHandle method);
 674   static AdapterHandlerEntry* get_adapter(methodHandle method);
 675 
 676   static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
 677   static void print_handler_on(outputStream* st, CodeBlob* b);
 678   static bool contains(CodeBlob* b);
 679 #ifndef PRODUCT
 680   static void print_statistics();
 681 #endif // PRODUCT
 682 
 683 };
 684 
 685 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
--- EOF ---