1 /*
   2  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 class AdapterHandlerEntry;
  26 class vframeStream;
  27 
  28 // Runtime is the base class for various runtime interfaces
  29 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
  30 // shared functionality such as exception forwarding (C++ to
  31 // Java exceptions), locking/unlocking mechanisms, statistical
  32 // information, etc.
  33 
  34 class SharedRuntime: AllStatic {
  35  private:
  36   static methodHandle resolve_sub_helper(JavaThread *thread,
  37                                      bool is_virtual,
  38                                      bool is_optimized, TRAPS);
  39 
  40   // Shared stub locations
  41 
  42   static RuntimeStub* _wrong_method_blob;
  43   static RuntimeStub* _ic_miss_blob;
  44   static RuntimeStub* _resolve_opt_virtual_call_blob;
  45   static RuntimeStub* _resolve_virtual_call_blob;
  46   static RuntimeStub* _resolve_static_call_blob;
  47 
  48   static SafepointBlob* _polling_page_safepoint_handler_blob;
  49   static SafepointBlob* _polling_page_return_handler_blob;
  50 #ifdef COMPILER2
  51   static ExceptionBlob*       _exception_blob;
  52   static UncommonTrapBlob*    _uncommon_trap_blob;
  53 #endif // COMPILER2
  54 
  55 #ifndef PRODUCT
  56 
  57   // Counters
  58   static int     _nof_megamorphic_calls;         // total # of megamorphic calls (through vtable)
  59 
  60 #endif // !PRODUCT
  61  public:
  62 
  63   // max bytes for each dtrace string parameter
  64   enum { max_dtrace_string_size = 256 };
  65 
  66   // The following arithmetic routines are used on platforms that do
  67   // not have machine instructions to implement their functionality.
  68   // Do not remove these.
  69 
  70   // long arithmetics
  71   static jlong   lmul(jlong y, jlong x);
  72   static jlong   ldiv(jlong y, jlong x);
  73   static jlong   lrem(jlong y, jlong x);
  74 
  75   // float and double remainder
  76   static jfloat  frem(jfloat  x, jfloat  y);
  77   static jdouble drem(jdouble x, jdouble y);
  78 
  79   // float conversion (needs to set appropriate rounding mode)
  80   static jint    f2i (jfloat  x);
  81   static jlong   f2l (jfloat  x);
  82   static jint    d2i (jdouble x);
  83   static jlong   d2l (jdouble x);
  84   static jfloat  d2f (jdouble x);
  85   static jfloat  l2f (jlong   x);
  86   static jdouble l2d (jlong   x);
  87 
  88   // double trigonometrics and transcendentals
  89   static jdouble dsin(jdouble x);
  90   static jdouble dcos(jdouble x);
  91   static jdouble dtan(jdouble x);
  92   static jdouble dlog(jdouble x);
  93   static jdouble dlog10(jdouble x);
  94   static jdouble dexp(jdouble x);
  95   static jdouble dpow(jdouble x, jdouble y);
  96 
  97 
  98   // exception handling across interpreter/compiler boundaries
  99   static address raw_exception_handler_for_return_address(address return_address);
 100   static address exception_handler_for_return_address(address return_address);
 101 
 102 #ifndef SERIALGC
 103   // G1 write barriers
 104   static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
 105   static void g1_wb_post(void* card_addr, JavaThread* thread);
 106 #endif // !SERIALGC
 107 
 108   // exception handling and implicit exceptions
 109   static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
 110                                               bool force_unwind, bool top_frame_only);
 111   enum ImplicitExceptionKind {
 112     IMPLICIT_NULL,
 113     IMPLICIT_DIVIDE_BY_ZERO,
 114     STACK_OVERFLOW
 115   };
 116   static void    throw_AbstractMethodError(JavaThread* thread);
 117   static void    throw_IncompatibleClassChangeError(JavaThread* thread);
 118   static void    throw_ArithmeticException(JavaThread* thread);
 119   static void    throw_NullPointerException(JavaThread* thread);
 120   static void    throw_NullPointerException_at_call(JavaThread* thread);
 121   static void    throw_StackOverflowError(JavaThread* thread);
 122   static address continuation_for_implicit_exception(JavaThread* thread,
 123                                                      address faulting_pc,
 124                                                      ImplicitExceptionKind exception_kind);
 125 
 126   // Shared stub locations
 127   static address get_poll_stub(address pc);
 128 
 129   static address get_ic_miss_stub() {
 130     assert(_ic_miss_blob!= NULL, "oops");
 131     return _ic_miss_blob->instructions_begin();
 132   }
 133 
 134   static address get_handle_wrong_method_stub() {
 135     assert(_wrong_method_blob!= NULL, "oops");
 136     return _wrong_method_blob->instructions_begin();
 137   }
 138 
 139 #ifdef COMPILER2
 140   static void generate_uncommon_trap_blob(void);
 141   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
 142 #endif // COMPILER2
 143 
 144   static address get_resolve_opt_virtual_call_stub(){
 145     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
 146     return _resolve_opt_virtual_call_blob->instructions_begin();
 147   }
 148   static address get_resolve_virtual_call_stub() {
 149     assert(_resolve_virtual_call_blob != NULL, "oops");
 150     return _resolve_virtual_call_blob->instructions_begin();
 151   }
 152   static address get_resolve_static_call_stub() {
 153     assert(_resolve_static_call_blob != NULL, "oops");
 154     return _resolve_static_call_blob->instructions_begin();
 155   }
 156 
 157   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
 158   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
 159 
 160   // Counters
 161 #ifndef PRODUCT
 162   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
 163 #endif // PRODUCT
 164 
 165   // Helper routine for full-speed JVMTI exception throwing support
 166   static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
 167   static void throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message = NULL);
 168 
 169   // RedefineClasses() tracing support for obsolete method entry
 170   static int rc_trace_method_entry(JavaThread* thread, methodOopDesc* m);
 171 
 172   // To be used as the entry point for unresolved native methods.
 173   static address native_method_throw_unsatisfied_link_error_entry();
 174 
 175   // bytecode tracing is only used by the TraceBytecodes
 176   static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
 177 
 178   // Used to back off a spin lock that is under heavy contention
 179   static void yield_all(JavaThread* thread, int attempts = 0);
 180 
 181   static oop retrieve_receiver( symbolHandle sig, frame caller );
 182 
 183   static void register_finalizer(JavaThread* thread, oopDesc* obj);
 184 
 185   // dtrace notifications
 186   static int dtrace_object_alloc(oopDesc* o);
 187   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
 188   static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m);
 189   static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m);
 190 
 191   // Utility method for retrieving the Java thread id, returns 0 if the
 192   // thread is not a well formed Java thread.
 193   static jlong get_java_tid(Thread* thread);
 194 
 195 
 196   // used by native wrappers to reenable yellow if overflow happened in native code
 197   static void reguard_yellow_pages();
 198 
 199   /**
 200    * Fill in the "X cannot be cast to a Y" message for ClassCastException
 201    *
 202    * @param thr the current thread
 203    * @param name the name of the class of the object attempted to be cast
 204    * @return the dynamically allocated exception message (must be freed
 205    * by the caller using a resource mark)
 206    *
 207    * BCP must refer to the current 'checkcast' opcode for the frame
 208    * on top of the stack.
 209    * The caller (or one of it's callers) must use a ResourceMark
 210    * in order to correctly free the result.
 211    */
 212   static char* generate_class_cast_message(JavaThread* thr, const char* name);
 213 
 214   /**
 215    * Fill in the message for a WrongMethodTypeException
 216    *
 217    * @param thr the current thread
 218    * @param mtype (optional) expected method type (or argument class)
 219    * @param mhandle (optional) actual method handle (or argument)
 220    * @return the dynamically allocated exception message
 221    *
 222    * BCP for the frame on top of the stack must refer to an
 223    * 'invokevirtual' op for a method handle, or an 'invokedyamic' op.
 224    * The caller (or one of its callers) must use a ResourceMark
 225    * in order to correctly free the result.
 226    */
 227   static char* generate_wrong_method_type_message(JavaThread* thr,
 228                                                   oopDesc* mtype = NULL,
 229                                                   oopDesc* mhandle = NULL);
 230 
 231   /** Return non-null if the mtype is a klass or Class, not a MethodType. */
 232   static oop wrong_method_type_is_for_single_argument(JavaThread* thr,
 233                                                       oopDesc* mtype);
 234 
 235   /**
 236    * Fill in the "X cannot be cast to a Y" message for ClassCastException
 237    *
 238    * @param name the name of the class of the object attempted to be cast
 239    * @param klass the name of the target klass attempt
 240    * @param gripe the specific kind of problem being reported
 241    * @return the dynamically allocated exception message (must be freed
 242    * by the caller using a resource mark)
 243    *
 244    * This version does not require access the frame, so it can be called
 245    * from interpreted code
 246    * The caller (or one of it's callers) must use a ResourceMark
 247    * in order to correctly free the result.
 248    */
 249   static char* generate_class_cast_message(const char* name, const char* klass,
 250                                            const char* gripe = " cannot be cast to ");
 251 
 252   // Resolves a call site- may patch in the destination of the call into the
 253   // compiled code.
 254   static methodHandle resolve_helper(JavaThread *thread,
 255                                      bool is_virtual,
 256                                      bool is_optimized, TRAPS);
 257 
 258   static void generate_stubs(void);
 259 
 260   private:
 261   // deopt blob
 262   static void generate_deopt_blob(void);
 263   static DeoptimizationBlob* _deopt_blob;
 264 
 265   public:
 266   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
 267 
 268   // Resets a call-site in compiled code so it will get resolved again.
 269   static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
 270 
 271   // In the code prolog, if the klass comparison fails, the inline cache
 272   // misses and the call site is patched to megamorphic
 273   static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
 274 
 275   // Find the method that called us.
 276   static methodHandle find_callee_method(JavaThread* thread, TRAPS);
 277 
 278 
 279  private:
 280   static Handle find_callee_info(JavaThread* thread,
 281                                  Bytecodes::Code& bc,
 282                                  CallInfo& callinfo, TRAPS);
 283   static Handle find_callee_info_helper(JavaThread* thread,
 284                                         vframeStream& vfst,
 285                                         Bytecodes::Code& bc,
 286                                         CallInfo& callinfo, TRAPS);
 287 
 288   static address clean_virtual_call_entry();
 289   static address clean_opt_virtual_call_entry();
 290   static address clean_static_call_entry();
 291 
 292  public:
 293 
 294   // Read the array of BasicTypes from a Java signature, and compute where
 295   // compiled Java code would like to put the results.  Values in reg_lo and
 296   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
 297   // registers, those above refer to 4-byte stack slots.  All stack slots are
 298   // based off of the window top.  SharedInfo::stack0 refers to the first usable
 299   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
 300   // 4-bytes higher. So for sparc because the register window save area is at
 301   // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
 302   // will be just above it. (
 303   // return value is the maximum number of VMReg stack slots the convention will use.
 304   static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing);
 305 
 306   // Ditto except for calling C
 307   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
 308 
 309   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
 310   // blobs. Unlike adapters in the tiger and earlier releases the code in these
 311   // blobs does not create a new frame and are therefore virtually invisible
 312   // to the stack walking code. In general these blobs extend the callers stack
 313   // as needed for the conversion of argument locations.
 314 
 315   // When calling a c2i blob the code will always call the interpreter even if
 316   // by the time we reach the blob there is compiled code available. This allows
 317   // the blob to pass the incoming stack pointer (the sender sp) in a known
 318   // location for the interpreter to record. This is used by the frame code
 319   // to correct the sender code to match up with the stack pointer when the
 320   // thread left the compiled code. In addition it allows the interpreter
 321   // to remove the space the c2i adapter allocated to do it argument conversion.
 322 
 323   // Although a c2i blob will always run interpreted even if compiled code is
 324   // present if we see that compiled code is present the compiled call site
 325   // will be patched/re-resolved so that later calls will run compiled.
 326 
 327   // Aditionally a c2i blob need to have a unverified entry because it can be reached
 328   // in situations where the call site is an inlined cache site and may go megamorphic.
 329 
 330   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
 331   // that the interpreter before it does any call dispatch will record the current
 332   // stack pointer in the interpreter frame. On return it will restore the stack
 333   // pointer as needed. This means the i2c adapter code doesn't need any special
 334   // handshaking path with compiled code to keep the stack walking correct.
 335 
 336   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
 337                                                       int total_args_passed,
 338                                                       int max_arg,
 339                                                       const BasicType *sig_bt,
 340                                                       const VMRegPair *regs);
 341 
 342   // OSR support
 343 
 344   // OSR_migration_begin will extract the jvm state from an interpreter
 345   // frame (locals, monitors) and store the data in a piece of C heap
 346   // storage. This then allows the interpreter frame to be removed from the
 347   // stack and the OSR nmethod to be called. That method is called with a
 348   // pointer to the C heap storage. This pointer is the return value from
 349   // OSR_migration_begin.
 350 
 351   static intptr_t* OSR_migration_begin( JavaThread *thread);
 352 
 353   // OSR_migration_end is a trivial routine. It is called after the compiled
 354   // method has extracted the jvm state from the C heap that OSR_migration_begin
 355   // created. It's entire job is to simply free this storage.
 356   static void      OSR_migration_end  ( intptr_t* buf);
 357 
 358   // Convert a sig into a calling convention register layout
 359   // and find interesting things about it.
 360   static VMRegPair* find_callee_arguments(symbolOop sig, bool is_static, int *arg_size);
 361   static VMReg     name_for_receiver();
 362 
 363   // "Top of Stack" slots that may be unused by the calling convention but must
 364   // otherwise be preserved.
 365   // On Intel these are not necessary and the value can be zero.
 366   // On Sparc this describes the words reserved for storing a register window
 367   // when an interrupt occurs.
 368   static uint out_preserve_stack_slots();
 369 
 370   // Save and restore a native result
 371   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
 372   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
 373 
 374   // Generate a native wrapper for a given method.  The method takes arguments
 375   // in the Java compiled code convention, marshals them to the native
 376   // convention (handlizes oops, etc), transitions to native, makes the call,
 377   // returns to java state (possibly blocking), unhandlizes any result and
 378   // returns.
 379   static nmethod *generate_native_wrapper(MacroAssembler* masm,
 380                                           methodHandle method,
 381                                           int total_args_passed,
 382                                           int max_arg,
 383                                           BasicType *sig_bt,
 384                                           VMRegPair *regs,
 385                                           BasicType ret_type );
 386 
 387 #ifdef HAVE_DTRACE_H
 388   // Generate a dtrace wrapper for a given method.  The method takes arguments
 389   // in the Java compiled code convention, marshals them to the native
 390   // convention (handlizes oops, etc), transitions to native, makes the call,
 391   // returns to java state (possibly blocking), unhandlizes any result and
 392   // returns.
 393   static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
 394                                           methodHandle method);
 395 
 396   // dtrace support to convert a Java string to utf8
 397   static void get_utf(oopDesc* src, address dst);
 398 #endif // def HAVE_DTRACE_H
 399 
 400   // A compiled caller has just called the interpreter, but compiled code
 401   // exists.  Patch the caller so he no longer calls into the interpreter.
 402   static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc);
 403 
 404   // Slow-path Locking and Unlocking
 405   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
 406   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
 407 
 408   // Resolving of calls
 409   static address resolve_static_call_C     (JavaThread *thread);
 410   static address resolve_virtual_call_C    (JavaThread *thread);
 411   static address resolve_opt_virtual_call_C(JavaThread *thread);
 412 
 413   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
 414   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
 415                                oopDesc* dest, jint dest_pos,
 416                                jint length, JavaThread* thread);
 417 
 418   // handle ic miss with caller being compiled code
 419   // wrong method handling (inline cache misses, zombie methods)
 420   static address handle_wrong_method(JavaThread* thread);
 421   static address handle_wrong_method_ic_miss(JavaThread* thread);
 422 
 423 #ifndef PRODUCT
 424 
 425   // Collect and print inline cache miss statistics
 426  private:
 427   enum { maxICmiss_count = 100 };
 428   static int     _ICmiss_index;                  // length of IC miss histogram
 429   static int     _ICmiss_count[maxICmiss_count]; // miss counts
 430   static address _ICmiss_at[maxICmiss_count];    // miss addresses
 431   static void trace_ic_miss(address at);
 432 
 433  public:
 434   static int _monitor_enter_ctr;                 // monitor enter slow
 435   static int _monitor_exit_ctr;                  // monitor exit slow
 436   static int _throw_null_ctr;                    // throwing a null-pointer exception
 437   static int _ic_miss_ctr;                       // total # of IC misses
 438   static int _wrong_method_ctr;
 439   static int _resolve_static_ctr;
 440   static int _resolve_virtual_ctr;
 441   static int _resolve_opt_virtual_ctr;
 442   static int _implicit_null_throws;
 443   static int _implicit_div0_throws;
 444 
 445   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
 446   static int _jshort_array_copy_ctr;       // Slow-path short array copy
 447   static int _jint_array_copy_ctr;         // Slow-path int array copy
 448   static int _jlong_array_copy_ctr;        // Slow-path long array copy
 449   static int _oop_array_copy_ctr;          // Slow-path oop array copy
 450   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
 451   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
 452   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
 453   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
 454 
 455   static int _new_instance_ctr;            // 'new' object requires GC
 456   static int _new_array_ctr;               // 'new' array requires GC
 457   static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
 458   static int _find_handler_ctr;            // find exception handler
 459   static int _rethrow_ctr;                 // rethrow exception
 460   static int _mon_enter_stub_ctr;          // monitor enter stub
 461   static int _mon_exit_stub_ctr;           // monitor exit stub
 462   static int _mon_enter_ctr;               // monitor enter slow
 463   static int _mon_exit_ctr;                // monitor exit slow
 464   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
 465 
 466   // Statistics code
 467   // stats for "normal" compiled calls (non-interface)
 468   static int     _nof_normal_calls;              // total # of calls
 469   static int     _nof_optimized_calls;           // total # of statically-bound calls
 470   static int     _nof_inlined_calls;             // total # of inlined normal calls
 471   static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)
 472   static int     _nof_inlined_static_calls;      // total # of inlined static calls
 473   // stats for compiled interface calls
 474   static int     _nof_interface_calls;           // total # of compiled calls
 475   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
 476   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
 477   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
 478   // stats for runtime exceptions
 479   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
 480 
 481  public: // for compiler
 482   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
 483   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
 484   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
 485   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
 486   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
 487   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
 488   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
 489   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
 490   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
 491   static void print_call_statistics(int comp_total);
 492   static void print_statistics();
 493   static void print_ic_miss_histogram();
 494 
 495 #endif // PRODUCT
 496 };
 497 
 498 
 499 // ---------------------------------------------------------------------------
 500 // Implementation of AdapterHandlerLibrary
 501 //
 502 // This library manages argument marshaling adapters and native wrappers.
 503 // There are 2 flavors of adapters: I2C and C2I.
 504 //
 505 // The I2C flavor takes a stock interpreted call setup, marshals the arguments
 506 // for a Java-compiled call, and jumps to Rmethod-> code()->
 507 // instructions_begin().  It is broken to call it without an nmethod assigned.
 508 // The usual behavior is to lift any register arguments up out of the stack
 509 // and possibly re-pack the extra arguments to be contigious.  I2C adapters
 510 // will save what the interpreter's stack pointer will be after arguments are
 511 // popped, then adjust the interpreter's frame size to force alignment and
 512 // possibly to repack the arguments.  After re-packing, it jumps to the
 513 // compiled code start.  There are no safepoints in this adapter code and a GC
 514 // cannot happen while marshaling is in progress.
 515 //
 516 // The C2I flavor takes a stock compiled call setup plus the target method in
 517 // Rmethod, marshals the arguments for an interpreted call and jumps to
 518 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
 519 // setup.  Compiled frames are fixed-size and the args are likely not in the
 520 // right place.  Hence all the args will likely be copied into the
 521 // interpreter's frame, forcing that frame to grow.  The compiled frame's
 522 // outgoing stack args will be dead after the copy.
 523 //
 524 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
 525 // also perform an offical frame push & pop.  They have a call to the native
 526 // routine in their middles and end in a return (instead of ending in a jump).
 527 // The native wrappers are stored in real nmethods instead of the BufferBlobs
 528 // used by the adapters.  The code generation happens here because it's very
 529 // similar to what the adapters have to do.
 530 
 531 class AdapterHandlerEntry : public CHeapObj {
 532  private:
 533   address _i2c_entry;
 534   address _c2i_entry;
 535   address _c2i_unverified_entry;
 536 
 537  public:
 538 
 539   // The name we give all buffer blobs
 540   static const char* name;
 541 
 542   AdapterHandlerEntry(address i2c_entry, address c2i_entry, address c2i_unverified_entry):
 543     _i2c_entry(i2c_entry),
 544     _c2i_entry(c2i_entry),
 545     _c2i_unverified_entry(c2i_unverified_entry) {
 546   }
 547 
 548   address get_i2c_entry()            { return _i2c_entry; }
 549   address get_c2i_entry()            { return _c2i_entry; }
 550   address get_c2i_unverified_entry() { return _c2i_unverified_entry; }
 551 
 552   void relocate(address new_base);
 553 #ifndef PRODUCT
 554   void print();
 555 #endif /* PRODUCT */
 556 };
 557 
 558 class AdapterHandlerLibrary: public AllStatic {
 559  private:
 560   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
 561   static GrowableArray<uint64_t>* _fingerprints; // the fingerprint collection
 562   static GrowableArray<AdapterHandlerEntry*> * _handlers; // the corresponding handlers
 563   enum {
 564     AbstractMethodHandler = 1 // special handler for abstract methods
 565   };
 566   static BufferBlob* buffer_blob();
 567   static void initialize();
 568   static int get_create_adapter_index(methodHandle method);
 569   static address get_i2c_entry( int index ) {
 570     return get_entry(index)->get_i2c_entry();
 571   }
 572   static address get_c2i_entry( int index ) {
 573     return get_entry(index)->get_c2i_entry();
 574   }
 575   static address get_c2i_unverified_entry( int index ) {
 576     return get_entry(index)->get_c2i_unverified_entry();
 577   }
 578 
 579  public:
 580   static AdapterHandlerEntry* get_entry( int index ) { return _handlers->at(index); }
 581   static nmethod* create_native_wrapper(methodHandle method);
 582   static AdapterHandlerEntry* get_adapter(methodHandle method)  {
 583     return get_entry(get_create_adapter_index(method));
 584   }
 585 #ifdef HAVE_DTRACE_H
 586   static nmethod* create_dtrace_nmethod (methodHandle method);
 587 #endif // HAVE_DTRACE_H
 588 
 589 #ifndef PRODUCT
 590   static void print_handler(CodeBlob* b);
 591   static bool contains(CodeBlob* b);
 592 #endif /* PRODUCT */
 593 
 594 };