1 /*
  2  * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_RUNTIME_SHAREDRUNTIME_HPP
 26 #define SHARE_RUNTIME_SHAREDRUNTIME_HPP
 27 
 28 #include "code/codeBlob.hpp"
 29 #include "code/vmreg.hpp"
 30 #include "interpreter/bytecodeTracer.hpp"
 31 #include "interpreter/linkResolver.hpp"
 32 #include "memory/allocation.hpp"
 33 #include "memory/resourceArea.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 bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
 53                                           CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
 54                                           Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
 55   static methodHandle resolve_sub_helper(bool is_virtual, bool is_optimized, TRAPS);
 56 
 57   // Shared stub locations
 58 
 59   static RuntimeStub*        _wrong_method_blob;
 60   static RuntimeStub*        _wrong_method_abstract_blob;
 61   static RuntimeStub*        _ic_miss_blob;
 62   static RuntimeStub*        _resolve_opt_virtual_call_blob;
 63   static RuntimeStub*        _resolve_virtual_call_blob;
 64   static RuntimeStub*        _resolve_static_call_blob;
 65   static address             _resolve_static_call_entry;
 66 
 67   static DeoptimizationBlob* _deopt_blob;
 68 
 69   static SafepointBlob*      _polling_page_vectors_safepoint_handler_blob;
 70   static SafepointBlob*      _polling_page_safepoint_handler_blob;
 71   static SafepointBlob*      _polling_page_return_handler_blob;
 72 
 73 #ifdef COMPILER2
 74   static UncommonTrapBlob*   _uncommon_trap_blob;
 75 #endif // COMPILER2
 76 
 77 #ifndef PRODUCT
 78   // Counters
 79   static int64_t _nof_megamorphic_calls;         // total # of megamorphic calls (through vtable)
 80 #endif // !PRODUCT
 81 
 82  private:
 83   enum { POLL_AT_RETURN,  POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
 84   static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
 85   static RuntimeStub*   generate_resolve_blob(address destination, const char* name);
 86 
 87  public:
 88   static void generate_stubs(void);
 89 
 90   // max bytes for each dtrace string parameter
 91   enum { max_dtrace_string_size = 256 };
 92 
 93   // The following arithmetic routines are used on platforms that do
 94   // not have machine instructions to implement their functionality.
 95   // Do not remove these.
 96 
 97   // long arithmetics
 98   static jlong   lmul(jlong y, jlong x);
 99   static jlong   ldiv(jlong y, jlong x);
100   static jlong   lrem(jlong y, jlong x);
101 
102   // float and double remainder
103   static jfloat  frem(jfloat  x, jfloat  y);
104   static jdouble drem(jdouble x, jdouble y);
105 
106 
107 #ifdef _WIN64
108   // Workaround for fmod issue in the Windows x64 CRT
109   static double fmod_winx64(double x, double y);
110 #endif
111 
112 #ifdef __SOFTFP__
113   static jfloat  fadd(jfloat x, jfloat y);
114   static jfloat  fsub(jfloat x, jfloat y);
115   static jfloat  fmul(jfloat x, jfloat y);
116   static jfloat  fdiv(jfloat x, jfloat y);
117 
118   static jdouble dadd(jdouble x, jdouble y);
119   static jdouble dsub(jdouble x, jdouble y);
120   static jdouble dmul(jdouble x, jdouble y);
121   static jdouble ddiv(jdouble x, jdouble y);
122 #endif // __SOFTFP__
123 
124   // float conversion (needs to set appropriate rounding mode)
125   static jint    f2i (jfloat  x);
126   static jlong   f2l (jfloat  x);
127   static jint    d2i (jdouble x);
128   static jlong   d2l (jdouble x);
129   static jfloat  d2f (jdouble x);
130   static jfloat  l2f (jlong   x);
131   static jdouble l2d (jlong   x);
132 
133 #ifdef __SOFTFP__
134   static jfloat  i2f (jint    x);
135   static jdouble i2d (jint    x);
136   static jdouble f2d (jfloat  x);
137 #endif // __SOFTFP__
138 
139   // double trigonometrics and transcendentals
140   static jdouble dsin(jdouble x);
141   static jdouble dcos(jdouble x);
142   static jdouble dtan(jdouble x);
143   static jdouble dlog(jdouble x);
144   static jdouble dlog10(jdouble x);
145   static jdouble dexp(jdouble x);
146   static jdouble dpow(jdouble x, jdouble y);
147 
148 #if defined(__SOFTFP__) || defined(E500V2)
149   static double dabs(double f);
150 #endif
151 
152 #if defined(__SOFTFP__) || defined(PPC)
153   static double dsqrt(double f);
154 #endif
155 
156   // Montgomery multiplication
157   static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
158                                   jint len, jlong inv, jint *m_ints);
159   static void montgomery_square(jint *a_ints, jint *n_ints,
160                                 jint len, jlong inv, jint *m_ints);
161 
162 #ifdef __SOFTFP__
163   // C++ compiler generates soft float instructions as well as passing
164   // float and double in registers.
165   static int  fcmpl(float x, float y);
166   static int  fcmpg(float x, float y);
167   static int  dcmpl(double x, double y);
168   static int  dcmpg(double x, double y);
169 
170   static int unordered_fcmplt(float x, float y);
171   static int unordered_dcmplt(double x, double y);
172   static int unordered_fcmple(float x, float y);
173   static int unordered_dcmple(double x, double y);
174   static int unordered_fcmpge(float x, float y);
175   static int unordered_dcmpge(double x, double y);
176   static int unordered_fcmpgt(float x, float y);
177   static int unordered_dcmpgt(double x, double y);
178 
179   static float  fneg(float f);
180   static double dneg(double f);
181 #endif
182 
183   // exception handling across interpreter/compiler boundaries
184   static address raw_exception_handler_for_return_address(JavaThread* current, address return_address);
185   static address exception_handler_for_return_address(JavaThread* current, address return_address);
186 
187   // exception handling and implicit exceptions
188   static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
189                                               bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
190   enum ImplicitExceptionKind {
191     IMPLICIT_NULL,
192     IMPLICIT_DIVIDE_BY_ZERO,
193     STACK_OVERFLOW
194   };
195   static void    throw_AbstractMethodError(JavaThread* current);
196   static void    throw_IncompatibleClassChangeError(JavaThread* current);
197   static void    throw_ArithmeticException(JavaThread* current);
198   static void    throw_NullPointerException(JavaThread* current);
199   static void    throw_NullPointerException_at_call(JavaThread* current);
200   static void    throw_StackOverflowError(JavaThread* current);
201   static void    throw_delayed_StackOverflowError(JavaThread* current);
202   static void    throw_StackOverflowError_common(JavaThread* current, bool delayed);
203   static address continuation_for_implicit_exception(JavaThread* current,
204                                                      address faulting_pc,
205                                                      ImplicitExceptionKind exception_kind);
206 
207   // Post-slow-path-allocation, pre-initializing-stores step for
208   // implementing e.g. ReduceInitialCardMarks
209   static void on_slowpath_allocation_exit(JavaThread* current);
210 
211   static void enable_stack_reserved_zone(JavaThread* current);
212   static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr);
213 
214   // Shared stub locations
215   static address get_poll_stub(address pc);
216 
217   static address get_ic_miss_stub() {
218     assert(_ic_miss_blob!= NULL, "oops");
219     return _ic_miss_blob->entry_point();
220   }
221 
222   static address get_handle_wrong_method_stub() {
223     assert(_wrong_method_blob!= NULL, "oops");
224     return _wrong_method_blob->entry_point();
225   }
226 
227   static address get_handle_wrong_method_abstract_stub() {
228     assert(_wrong_method_abstract_blob!= NULL, "oops");
229     return _wrong_method_abstract_blob->entry_point();
230   }
231 
232 #ifdef COMPILER2
233   static void generate_uncommon_trap_blob(void);
234   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
235 #endif // COMPILER2
236 
237   static address get_resolve_opt_virtual_call_stub() {
238     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
239     return _resolve_opt_virtual_call_blob->entry_point();
240   }
241   static address get_resolve_virtual_call_stub() {
242     assert(_resolve_virtual_call_blob != NULL, "oops");
243     return _resolve_virtual_call_blob->entry_point();
244   }
245   static address get_resolve_static_call_stub() {
246     assert(_resolve_static_call_blob != NULL, "oops");
247     return _resolve_static_call_blob->entry_point();
248   }
249 
250   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
251   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
252   static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }
253 
254   // Counters
255 #ifndef PRODUCT
256   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
257 #endif // PRODUCT
258 
259   // Helper routine for full-speed JVMTI exception throwing support
260   static void throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception);
261   static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = NULL);
262 
263   // RedefineClasses() tracing support for obsolete method entry
264   static int rc_trace_method_entry(JavaThread* thread, Method* m);
265 
266   // To be used as the entry point for unresolved native methods.
267   static address native_method_throw_unsatisfied_link_error_entry();
268 
269   static oop retrieve_receiver(Symbol* sig, frame caller);
270 
271   static void register_finalizer(JavaThread* thread, oopDesc* obj);
272 
273   // dtrace notifications
274   static int dtrace_object_alloc(oopDesc* o);
275   static int dtrace_object_alloc(Thread* thread, oopDesc* o);
276   static int dtrace_object_alloc(Thread* thread, oopDesc* o, size_t size);
277   static int dtrace_method_entry(JavaThread* thread, Method* m);
278   static int dtrace_method_exit(JavaThread* thread, Method* m);
279 
280   // Utility method for retrieving the Java thread id, returns 0 if the
281   // thread is not a well formed Java thread.
282   static jlong get_java_tid(Thread* thread);
283 
284 
285   // used by native wrappers to reenable yellow if overflow happened in native code
286   static void reguard_yellow_pages();
287 
288   // Fill in the "X cannot be cast to a Y" message for ClassCastException
289   //
290   // @param thr the current thread
291   // @param caster_klass the class of the object we are casting
292   // @return the dynamically allocated exception message (must be freed
293   // by the caller using a resource mark)
294   //
295   // BCP must refer to the current 'checkcast' opcode for the frame
296   // on top of the stack.
297   // The caller (or one of its callers) must use a ResourceMark
298   // in order to correctly free the result.
299   //
300   static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
301 
302   // Fill in the "X cannot be cast to a Y" message for ClassCastException
303   //
304   // @param caster_klass the class of the object we are casting
305   // @param target_klass the target klass attempt
306   // @return the dynamically allocated exception message (must be freed
307   // by the caller using a resource mark)
308   //
309   // This version does not require access the frame, so it can be called
310   // from interpreted code
311   // The caller (or one of it's callers) must use a ResourceMark
312   // in order to correctly free the result.
313   //
314   static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);
315 
316   // Resolves a call site- may patch in the destination of the call into the
317   // compiled code.
318   static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
319 
320  private:
321   // deopt blob
322   static void generate_deopt_blob(void);
323 
324   static bool handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, const frame& caller_frame,
325                                              methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
326                                              bool& needs_ic_stub_refill, TRAPS);
327 
328  public:
329   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
330 
331   // Resets a call-site in compiled code so it will get resolved again.
332   static methodHandle reresolve_call_site(TRAPS);
333 
334   // In the code prolog, if the klass comparison fails, the inline cache
335   // misses and the call site is patched to megamorphic
336   static methodHandle handle_ic_miss_helper(TRAPS);
337 
338   // Find the method that called us.
339   static methodHandle find_callee_method(TRAPS);
340 
341   static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
342 
343   static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
344 
345  private:
346   static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
347   static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
348 
349   static Method* extract_attached_method(vframeStream& vfst);
350 
351 #if defined(X86) && defined(COMPILER1)
352   // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
353   static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
354 #endif // X86 && COMPILER1
355 
356  public:
357 
358   // Read the array of BasicTypes from a Java signature, and compute where
359   // compiled Java code would like to put the results.  Values in reg_lo and
360   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
361   // registers, those above refer to 4-byte stack slots.  All stack slots are
362   // based off of the window top.  SharedInfo::stack0 refers to the first usable
363   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
364   // 4-bytes higher.
365   // return value is the maximum number of VMReg stack slots the convention will use.
366   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
367 
368   static void check_member_name_argument_is_last_argument(const methodHandle& method,
369                                                           const BasicType* sig_bt,
370                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
371 
372   // Ditto except for calling C
373   //
374   // C argument in register AND stack slot.
375   // Some architectures require that an argument must be passed in a register
376   // AND in a stack slot. These architectures provide a second VMRegPair array
377   // to be filled by the c_calling_convention method. On other architectures,
378   // NULL is being passed as the second VMRegPair array, so arguments are either
379   // passed in a register OR in a stack slot.
380   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
381                                   int total_args_passed);
382 
383   static int vector_calling_convention(VMRegPair *regs,
384                                        uint num_bits,
385                                        uint total_args_passed);
386 
387   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
388   // blobs. Unlike adapters in the tiger and earlier releases the code in these
389   // blobs does not create a new frame and are therefore virtually invisible
390   // to the stack walking code. In general these blobs extend the callers stack
391   // as needed for the conversion of argument locations.
392 
393   // When calling a c2i blob the code will always call the interpreter even if
394   // by the time we reach the blob there is compiled code available. This allows
395   // the blob to pass the incoming stack pointer (the sender sp) in a known
396   // location for the interpreter to record. This is used by the frame code
397   // to correct the sender code to match up with the stack pointer when the
398   // thread left the compiled code. In addition it allows the interpreter
399   // to remove the space the c2i adapter allocated to do its argument conversion.
400 
401   // Although a c2i blob will always run interpreted even if compiled code is
402   // present if we see that compiled code is present the compiled call site
403   // will be patched/re-resolved so that later calls will run compiled.
404 
405   // Additionally a c2i blob need to have a unverified entry because it can be reached
406   // in situations where the call site is an inlined cache site and may go megamorphic.
407 
408   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
409   // that the interpreter before it does any call dispatch will record the current
410   // stack pointer in the interpreter frame. On return it will restore the stack
411   // pointer as needed. This means the i2c adapter code doesn't need any special
412   // handshaking path with compiled code to keep the stack walking correct.
413 
414   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
415                                                       int total_args_passed,
416                                                       int max_arg,
417                                                       const BasicType *sig_bt,
418                                                       const VMRegPair *regs,
419                                                       AdapterFingerPrint* fingerprint);
420 
421   static void gen_i2c_adapter(MacroAssembler *_masm,
422                               int total_args_passed,
423                               int comp_args_on_stack,
424                               const BasicType *sig_bt,
425                               const VMRegPair *regs);
426 
427   // OSR support
428 
429   // OSR_migration_begin will extract the jvm state from an interpreter
430   // frame (locals, monitors) and store the data in a piece of C heap
431   // storage. This then allows the interpreter frame to be removed from the
432   // stack and the OSR nmethod to be called. That method is called with a
433   // pointer to the C heap storage. This pointer is the return value from
434   // OSR_migration_begin.
435 
436   static intptr_t* OSR_migration_begin(JavaThread *thread);
437 
438   // OSR_migration_end is a trivial routine. It is called after the compiled
439   // method has extracted the jvm state from the C heap that OSR_migration_begin
440   // created. It's entire job is to simply free this storage.
441   static void OSR_migration_end(intptr_t* buf);
442 
443   // Convert a sig into a calling convention register layout
444   // and find interesting things about it.
445   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
446   static VMReg name_for_receiver();
447 
448   // "Top of Stack" slots that may be unused by the calling convention but must
449   // otherwise be preserved.
450   // On Intel these are not necessary and the value can be zero.
451   // On Sparc this describes the words reserved for storing a register window
452   // when an interrupt occurs.
453   static uint out_preserve_stack_slots();
454 
455   // Stack slots that may be unused by the calling convention but must
456   // otherwise be preserved.  On Intel this includes the return address.
457   // On PowerPC it includes the 4 words holding the old TOC & LR glue.
458   static uint in_preserve_stack_slots();
459 
460   // Is vector's size (in bytes) bigger than a size saved by default?
461   // For example, on x86 16 bytes XMM registers are saved by default.
462   static bool is_wide_vector(int size);
463 
464   // Save and restore a native result
465   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
466   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
467 
468   // Generate a native wrapper for a given method.  The method takes arguments
469   // in the Java compiled code convention, marshals them to the native
470   // convention (handlizes oops, etc), transitions to native, makes the call,
471   // returns to java state (possibly blocking), unhandlizes any result and
472   // returns.
473   //
474   // The wrapper may contain special-case code if the given method
475   // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
476   static nmethod* generate_native_wrapper(MacroAssembler* masm,
477                                           const methodHandle& method,
478                                           int compile_id,
479                                           BasicType* sig_bt,
480                                           VMRegPair* regs,
481                                           BasicType ret_type);
482 
483   // A compiled caller has just called the interpreter, but compiled code
484   // exists.  Patch the caller so he no longer calls into the interpreter.
485   static void fixup_callers_callsite(Method* moop, address ret_pc);
486   static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
487 
488   // Slow-path Locking and Unlocking
489   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
490   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
491 
492   // Resolving of calls
493   static address resolve_static_call_C     (JavaThread* current);
494   static address resolve_virtual_call_C    (JavaThread* current);
495   static address resolve_opt_virtual_call_C(JavaThread* current);
496 
497   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
498   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
499                                oopDesc* dest, jint dest_pos,
500                                jint length, JavaThread* thread);
501 
502   // handle ic miss with caller being compiled code
503   // wrong method handling (inline cache misses, zombie methods)
504   static address handle_wrong_method(JavaThread* current);
505   static address handle_wrong_method_abstract(JavaThread* current);
506   static address handle_wrong_method_ic_miss(JavaThread* current);
507 
508   static address handle_unsafe_access(JavaThread* thread, address next_pc);
509 
510 #ifndef PRODUCT
511 
512   // Collect and print inline cache miss statistics
513  private:
514   enum { maxICmiss_count = 100 };
515   static int     _ICmiss_index;                  // length of IC miss histogram
516   static int     _ICmiss_count[maxICmiss_count]; // miss counts
517   static address _ICmiss_at[maxICmiss_count];    // miss addresses
518   static void trace_ic_miss(address at);
519 
520  public:
521   static int _ic_miss_ctr;                       // total # of IC misses
522   static int _wrong_method_ctr;
523   static int _resolve_static_ctr;
524   static int _resolve_virtual_ctr;
525   static int _resolve_opt_virtual_ctr;
526   static int _implicit_null_throws;
527   static int _implicit_div0_throws;
528 
529   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
530   static int _jshort_array_copy_ctr;       // Slow-path short array copy
531   static int _jint_array_copy_ctr;         // Slow-path int array copy
532   static int _jlong_array_copy_ctr;        // Slow-path long array copy
533   static int _oop_array_copy_ctr;          // Slow-path oop array copy
534   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
535   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
536   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
537   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
538 
539   static int _new_instance_ctr;            // 'new' object requires GC
540   static int _new_array_ctr;               // 'new' array requires GC
541   static int _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
542   static int _find_handler_ctr;            // find exception handler
543   static int _rethrow_ctr;                 // rethrow exception
544   static int _mon_enter_stub_ctr;          // monitor enter stub
545   static int _mon_exit_stub_ctr;           // monitor exit stub
546   static int _mon_enter_ctr;               // monitor enter slow
547   static int _mon_exit_ctr;                // monitor exit slow
548   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
549 
550   // Statistics code
551   // stats for "normal" compiled calls (non-interface)
552   static int64_t _nof_normal_calls;               // total # of calls
553   static int64_t _nof_optimized_calls;            // total # of statically-bound calls
554   static int64_t _nof_inlined_calls;              // total # of inlined normal calls
555   static int64_t _nof_static_calls;               // total # of calls to static methods or super methods (invokespecial)
556   static int64_t _nof_inlined_static_calls;       // total # of inlined static calls
557   // stats for compiled interface calls
558   static int64_t _nof_interface_calls;            // total # of compiled calls
559   static int64_t _nof_optimized_interface_calls;  // total # of statically-bound interface calls
560   static int64_t _nof_inlined_interface_calls;    // total # of inlined interface calls
561   static int64_t _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
562 
563  public: // for compiler
564   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
565   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
566   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
567   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
568   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
569   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
570   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
571   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
572   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
573   static void print_call_statistics(uint64_t comp_total);
574   static void print_statistics();
575   static void print_ic_miss_histogram();
576 
577 #endif // PRODUCT
578 };
579 
580 
581 // ---------------------------------------------------------------------------
582 // Implementation of AdapterHandlerLibrary
583 //
584 // This library manages argument marshaling adapters and native wrappers.
585 // There are 2 flavors of adapters: I2C and C2I.
586 //
587 // The I2C flavor takes a stock interpreted call setup, marshals the
588 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
589 // code_begin().  It is broken to call it without an nmethod assigned.
590 // The usual behavior is to lift any register arguments up out of the
591 // stack and possibly re-pack the extra arguments to be contiguous.
592 // I2C adapters will save what the interpreter's stack pointer will be
593 // after arguments are popped, then adjust the interpreter's frame
594 // size to force alignment and possibly to repack the arguments.
595 // After re-packing, it jumps to the compiled code start.  There are
596 // no safepoints in this adapter code and a GC cannot happen while
597 // marshaling is in progress.
598 //
599 // The C2I flavor takes a stock compiled call setup plus the target method in
600 // Rmethod, marshals the arguments for an interpreted call and jumps to
601 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
602 // setup.  Compiled frames are fixed-size and the args are likely not in the
603 // right place.  Hence all the args will likely be copied into the
604 // interpreter's frame, forcing that frame to grow.  The compiled frame's
605 // outgoing stack args will be dead after the copy.
606 //
607 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
608 // also perform an official frame push & pop.  They have a call to the native
609 // routine in their middles and end in a return (instead of ending in a jump).
610 // The native wrappers are stored in real nmethods instead of the BufferBlobs
611 // used by the adapters.  The code generation happens here because it's very
612 // similar to what the adapters have to do.
613 
614 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
615   friend class AdapterHandlerTable;
616   friend class AdapterHandlerLibrary;
617 
618  private:
619   AdapterFingerPrint* _fingerprint;
620   address _i2c_entry;
621   address _c2i_entry;
622   address _c2i_unverified_entry;
623   address _c2i_no_clinit_check_entry;
624 
625 #ifdef ASSERT
626   // Captures code and signature used to generate this adapter when
627   // verifying adapter equivalence.
628   unsigned char* _saved_code;
629   int            _saved_code_length;
630 #endif
631 
632   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry) {
633     _fingerprint = fingerprint;
634     _i2c_entry = i2c_entry;
635     _c2i_entry = c2i_entry;
636     _c2i_unverified_entry = c2i_unverified_entry;
637     _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry;
638 #ifdef ASSERT
639     _saved_code_length = 0;
640 #endif
641   }
642 
643   void deallocate();
644 
645   // should never be used
646   AdapterHandlerEntry();
647 
648  public:
649   address get_i2c_entry()                  const { return _i2c_entry; }
650   address get_c2i_entry()                  const { return _c2i_entry; }
651   address get_c2i_unverified_entry()       const { return _c2i_unverified_entry; }
652   address get_c2i_no_clinit_check_entry()  const { return _c2i_no_clinit_check_entry; }
653 
654   address base_address();
655   void relocate(address new_base);
656 
657   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
658 
659   AdapterHandlerEntry* next() {
660     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
661   }
662 
663 #ifdef ASSERT
664   // Used to verify that code generated for shared adapters is equivalent
665   void save_code   (unsigned char* code, int length);
666   bool compare_code(AdapterHandlerEntry* other);
667 #endif
668 
669   //virtual void print_on(outputStream* st) const;  DO NOT USE
670   void print_adapter_on(outputStream* st) const;
671 };
672 
673 class AdapterHandlerLibrary: public AllStatic {
674   friend class SharedRuntime;
675  private:
676   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
677   static AdapterHandlerTable* _adapters;
678   static AdapterHandlerEntry* _abstract_method_handler;
679   static AdapterHandlerEntry* _no_arg_handler;
680   static AdapterHandlerEntry* _int_arg_handler;
681   static AdapterHandlerEntry* _obj_arg_handler;
682   static AdapterHandlerEntry* _obj_int_arg_handler;
683   static AdapterHandlerEntry* _obj_obj_arg_handler;
684 
685   static BufferBlob* buffer_blob();
686   static void initialize();
687   static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
688                                              int total_args_passed,
689                                              BasicType* sig_bt,
690                                              bool allocate_code_blob);
691   static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
692  public:
693 
694   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
695                                         address i2c_entry,
696                                         address c2i_entry,
697                                         address c2i_unverified_entry,
698                                         address c2i_no_clinit_check_entry = NULL);
699   static void create_native_wrapper(const methodHandle& method);
700   static AdapterHandlerEntry* get_adapter(const methodHandle& method);
701 
702   static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
703   static void print_handler_on(outputStream* st, const CodeBlob* b);
704   static bool contains(const CodeBlob* b);
705 #ifndef PRODUCT
706   static void print_statistics();
707 #endif // PRODUCT
708 
709 };
710 
711 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP