1 /*
  2  * Copyright (c) 1997, 2018, 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 "utilities/hashtable.hpp"
 34 #include "utilities/macros.hpp"
 35 
 36 class AdapterHandlerEntry;
 37 class AdapterHandlerTable;
 38 class AdapterFingerPrint;
 39 class vframeStream;
 40 
 41 // Runtime is the base class for various runtime interfaces
 42 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
 43 // shared functionality such as exception forwarding (C++ to
 44 // Java exceptions), locking/unlocking mechanisms, statistical
 45 // information, etc.
 46 
 47 class SharedRuntime: AllStatic {
 48   friend class VMStructs;
 49 
 50  private:
 51   static methodHandle resolve_sub_helper(JavaThread *thread,
 52                                          bool is_virtual,
 53                                          bool is_optimized, TRAPS);
 54 
 55   // Shared stub locations
 56 
 57   static RuntimeStub*        _wrong_method_blob;
 58   static RuntimeStub*        _wrong_method_abstract_blob;
 59   static RuntimeStub*        _ic_miss_blob;
 60   static RuntimeStub*        _resolve_opt_virtual_call_blob;
 61   static RuntimeStub*        _resolve_virtual_call_blob;
 62   static RuntimeStub*        _resolve_static_call_blob;
 63   static address             _resolve_static_call_entry;
 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 
105 #ifdef _WIN64
106   // Workaround for fmod issue in the Windows x64 CRT
107   static double fmod_winx64(double x, double y);
108 #endif
109 
110 #ifdef __SOFTFP__
111   static jfloat  fadd(jfloat x, jfloat y);
112   static jfloat  fsub(jfloat x, jfloat y);
113   static jfloat  fmul(jfloat x, jfloat y);
114   static jfloat  fdiv(jfloat x, jfloat y);
115 
116   static jdouble dadd(jdouble x, jdouble y);
117   static jdouble dsub(jdouble x, jdouble y);
118   static jdouble dmul(jdouble x, jdouble y);
119   static jdouble ddiv(jdouble x, jdouble y);
120 #endif // __SOFTFP__
121 
122   // float conversion (needs to set appropriate rounding mode)
123   static jint    f2i (jfloat  x);
124   static jlong   f2l (jfloat  x);
125   static jint    d2i (jdouble x);
126   static jlong   d2l (jdouble x);
127   static jfloat  d2f (jdouble x);
128   static jfloat  l2f (jlong   x);
129   static jdouble l2d (jlong   x);
130 
131 #ifdef __SOFTFP__
132   static jfloat  i2f (jint    x);
133   static jdouble i2d (jint    x);
134   static jdouble f2d (jfloat  x);
135 #endif // __SOFTFP__
136 
137   // double trigonometrics and transcendentals
138   static jdouble dsin(jdouble x);
139   static jdouble dcos(jdouble x);
140   static jdouble dtan(jdouble x);
141   static jdouble dlog(jdouble x);
142   static jdouble dlog10(jdouble x);
143   static jdouble dexp(jdouble x);
144   static jdouble dpow(jdouble x, jdouble y);
145 
146 #if defined(__SOFTFP__) || defined(E500V2)
147   static double dabs(double f);
148 #endif
149 
150 #if defined(__SOFTFP__) || defined(PPC)
151   static double dsqrt(double f);
152 #endif
153 
154   // Montgomery multiplication
155   static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
156                                   jint len, jlong inv, jint *m_ints);
157   static void montgomery_square(jint *a_ints, jint *n_ints,
158                                 jint len, jlong inv, jint *m_ints);
159 
160 #ifdef __SOFTFP__
161   // C++ compiler generates soft float instructions as well as passing
162   // float and double in registers.
163   static int  fcmpl(float x, float y);
164   static int  fcmpg(float x, float y);
165   static int  dcmpl(double x, double y);
166   static int  dcmpg(double x, double y);
167 
168   static int unordered_fcmplt(float x, float y);
169   static int unordered_dcmplt(double x, double y);
170   static int unordered_fcmple(float x, float y);
171   static int unordered_dcmple(double x, double y);
172   static int unordered_fcmpge(float x, float y);
173   static int unordered_dcmpge(double x, double y);
174   static int unordered_fcmpgt(float x, float y);
175   static int unordered_dcmpgt(double x, double y);
176 
177   static float  fneg(float f);
178   static double dneg(double f);
179 #endif
180 
181   // exception handling across interpreter/compiler boundaries
182   static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
183   static address exception_handler_for_return_address(JavaThread* thread, address return_address);
184 
185   // exception handling and implicit exceptions
186   static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
187                                               bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
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 void    throw_delayed_StackOverflowError(JavaThread* thread);
200   static void    throw_StackOverflowError_common(JavaThread* thread, bool delayed);
201   static address continuation_for_implicit_exception(JavaThread* thread,
202                                                      address faulting_pc,
203                                                      ImplicitExceptionKind exception_kind);
204 #if INCLUDE_JVMCI
205   static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason);
206 #endif
207 
208   // Post-slow-path-allocation, pre-initializing-stores step for
209   // implementing e.g. ReduceInitialCardMarks
210   static void on_slowpath_allocation_exit(JavaThread* thread);
211 
212   static void enable_stack_reserved_zone(JavaThread* thread);
213   static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
214 
215   // Shared stub locations
216   static address get_poll_stub(address pc);
217 
218   static address get_ic_miss_stub() {
219     assert(_ic_miss_blob!= NULL, "oops");
220     return _ic_miss_blob->entry_point();
221   }
222 
223   static address get_handle_wrong_method_stub() {
224     assert(_wrong_method_blob!= NULL, "oops");
225     return _wrong_method_blob->entry_point();
226   }
227 
228   static address get_handle_wrong_method_abstract_stub() {
229     assert(_wrong_method_abstract_blob!= NULL, "oops");
230     return _wrong_method_abstract_blob->entry_point();
231   }
232 
233 #ifdef COMPILER2
234   static void generate_uncommon_trap_blob(void);
235   static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }
236 #endif // COMPILER2
237 
238   static address get_resolve_opt_virtual_call_stub() {
239     assert(_resolve_opt_virtual_call_blob != NULL, "oops");
240     return _resolve_opt_virtual_call_blob->entry_point();
241   }
242   static address get_resolve_virtual_call_stub() {
243     assert(_resolve_virtual_call_blob != NULL, "oops");
244     return _resolve_virtual_call_blob->entry_point();
245   }
246   static address get_resolve_static_call_stub() {
247     assert(_resolve_static_call_blob != NULL, "oops");
248     return _resolve_static_call_blob->entry_point();
249   }
250 
251   static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }
252   static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }
253   static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }
254 
255   // Counters
256 #ifndef PRODUCT
257   static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
258 #endif // PRODUCT
259 
260   // Helper routine for full-speed JVMTI exception throwing support
261   static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
262   static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
263 
264   // RedefineClasses() tracing support for obsolete method entry
265   static int rc_trace_method_entry(JavaThread* thread, Method* m);
266 
267   // To be used as the entry point for unresolved native methods.
268   static address native_method_throw_unsatisfied_link_error_entry();
269   static address native_method_throw_unsupported_operation_exception_entry();
270 
271   static oop retrieve_receiver(Symbol* sig, frame caller);
272 
273   static void register_finalizer(JavaThread* thread, oopDesc* obj);
274 
275   // dtrace notifications
276   static int dtrace_object_alloc(oopDesc* o, int size);
277   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
278   static int dtrace_method_entry(JavaThread* thread, Method* m);
279   static int dtrace_method_exit(JavaThread* thread, Method* m);
280 
281   // Utility method for retrieving the Java thread id, returns 0 if the
282   // thread is not a well formed Java thread.
283   static jlong get_java_tid(Thread* thread);
284 
285 
286   // used by native wrappers to reenable yellow if overflow happened in native code
287   static void reguard_yellow_pages();
288 
289   // Fill in the "X cannot be cast to a Y" message for ClassCastException
290   //
291   // @param thr the current thread
292   // @param caster_klass the class of the object we are casting
293   // @return the dynamically allocated exception message (must be freed
294   // by the caller using a resource mark)
295   //
296   // BCP must refer to the current 'checkcast' opcode for the frame
297   // on top of the stack.
298   // The caller (or one of its callers) must use a ResourceMark
299   // in order to correctly free the result.
300   //
301   static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
302 
303   // Fill in the "X cannot be cast to a Y" message for ClassCastException
304   //
305   // @param caster_klass the class of the object we are casting
306   // @param target_klass the target klass attempt
307   // @return the dynamically allocated exception message (must be freed
308   // by the caller using a resource mark)
309   //
310   // This version does not require access the frame, so it can be called
311   // from interpreted code
312   // The caller (or one of it's callers) must use a ResourceMark
313   // in order to correctly free the result.
314   //
315   static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);
316 
317   // Resolves a call site- may patch in the destination of the call into the
318   // compiled code.
319   static methodHandle resolve_helper(JavaThread *thread,
320                                      bool is_virtual,
321                                      bool is_optimized, TRAPS);
322 
323  private:
324   // deopt blob
325   static void generate_deopt_blob(void);
326 
327  public:
328   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
329 
330   // Resets a call-site in compiled code so it will get resolved again.
331   static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
332 
333   // In the code prolog, if the klass comparison fails, the inline cache
334   // misses and the call site is patched to megamorphic
335   static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
336 
337   // Find the method that called us.
338   static methodHandle find_callee_method(JavaThread* thread, TRAPS);
339 
340 
341  private:
342   static Handle find_callee_info(JavaThread* thread,
343                                  Bytecodes::Code& bc,
344                                  CallInfo& callinfo, TRAPS);
345   static Handle find_callee_info_helper(JavaThread* thread,
346                                         vframeStream& vfst,
347                                         Bytecodes::Code& bc,
348                                         CallInfo& callinfo, TRAPS);
349 
350   static methodHandle extract_attached_method(vframeStream& vfst);
351 
352   static address clean_virtual_call_entry();
353   static address clean_opt_virtual_call_entry();
354   static address clean_static_call_entry();
355 
356 #if defined(X86) && defined(COMPILER1)
357   // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
358   static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
359 #endif // X86 && COMPILER1
360 
361  public:
362 
363   // Read the array of BasicTypes from a Java signature, and compute where
364   // compiled Java code would like to put the results.  Values in reg_lo and
365   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
366   // registers, those above refer to 4-byte stack slots.  All stack slots are
367   // based off of the window top.  SharedInfo::stack0 refers to the first usable
368   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
369   // 4-bytes higher. So for sparc because the register window save area is at
370   // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
371   // will be just above it. (
372   // return value is the maximum number of VMReg stack slots the convention will use.
373   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
374 
375   static void check_member_name_argument_is_last_argument(const methodHandle& method,
376                                                           const BasicType* sig_bt,
377                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
378 
379   // Ditto except for calling C
380   //
381   // C argument in register AND stack slot.
382   // Some architectures require that an argument must be passed in a register
383   // AND in a stack slot. These architectures provide a second VMRegPair array
384   // to be filled by the c_calling_convention method. On other architectures,
385   // NULL is being passed as the second VMRegPair array, so arguments are either
386   // passed in a register OR in a stack slot.
387   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
388                                   int total_args_passed);
389 
390   static size_t trampoline_size();
391 
392   static void generate_trampoline(MacroAssembler *masm, address destination);
393 
394   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
395   // blobs. Unlike adapters in the tiger and earlier releases the code in these
396   // blobs does not create a new frame and are therefore virtually invisible
397   // to the stack walking code. In general these blobs extend the callers stack
398   // as needed for the conversion of argument locations.
399 
400   // When calling a c2i blob the code will always call the interpreter even if
401   // by the time we reach the blob there is compiled code available. This allows
402   // the blob to pass the incoming stack pointer (the sender sp) in a known
403   // location for the interpreter to record. This is used by the frame code
404   // to correct the sender code to match up with the stack pointer when the
405   // thread left the compiled code. In addition it allows the interpreter
406   // to remove the space the c2i adapter allocated to do its argument conversion.
407 
408   // Although a c2i blob will always run interpreted even if compiled code is
409   // present if we see that compiled code is present the compiled call site
410   // will be patched/re-resolved so that later calls will run compiled.
411 
412   // Additionally a c2i blob need to have a unverified entry because it can be reached
413   // in situations where the call site is an inlined cache site and may go megamorphic.
414 
415   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
416   // that the interpreter before it does any call dispatch will record the current
417   // stack pointer in the interpreter frame. On return it will restore the stack
418   // pointer as needed. This means the i2c adapter code doesn't need any special
419   // handshaking path with compiled code to keep the stack walking correct.
420 
421   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
422                                                       int total_args_passed,
423                                                       int max_arg,
424                                                       const BasicType *sig_bt,
425                                                       const VMRegPair *regs,
426                                                       AdapterFingerPrint* fingerprint);
427 
428   static void gen_i2c_adapter(MacroAssembler *_masm,
429                               int total_args_passed,
430                               int comp_args_on_stack,
431                               const BasicType *sig_bt,
432                               const VMRegPair *regs);
433 
434   // OSR support
435 
436   // OSR_migration_begin will extract the jvm state from an interpreter
437   // frame (locals, monitors) and store the data in a piece of C heap
438   // storage. This then allows the interpreter frame to be removed from the
439   // stack and the OSR nmethod to be called. That method is called with a
440   // pointer to the C heap storage. This pointer is the return value from
441   // OSR_migration_begin.
442 
443   static intptr_t* OSR_migration_begin(JavaThread *thread);
444 
445   // OSR_migration_end is a trivial routine. It is called after the compiled
446   // method has extracted the jvm state from the C heap that OSR_migration_begin
447   // created. It's entire job is to simply free this storage.
448   static void OSR_migration_end(intptr_t* buf);
449 
450   // Convert a sig into a calling convention register layout
451   // and find interesting things about it.
452   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
453   static VMReg name_for_receiver();
454 
455   // "Top of Stack" slots that may be unused by the calling convention but must
456   // otherwise be preserved.
457   // On Intel these are not necessary and the value can be zero.
458   // On Sparc this describes the words reserved for storing a register window
459   // when an interrupt occurs.
460   static uint out_preserve_stack_slots();
461 
462   // Is vector's size (in bytes) bigger than a size saved by default?
463   // For example, on x86 16 bytes XMM registers are saved by default.
464   static bool is_wide_vector(int size);
465 
466   // Save and restore a native result
467   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
468   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
469 
470   // Generate a native wrapper for a given method.  The method takes arguments
471   // in the Java compiled code convention, marshals them to the native
472   // convention (handlizes oops, etc), transitions to native, makes the call,
473   // returns to java state (possibly blocking), unhandlizes any result and
474   // returns.
475   //
476   // The wrapper may contain special-case code if the given method
477   // is a JNI critical method, or a compiled method handle adapter,
478   // such as _invokeBasic, _linkToVirtual, etc.
479   static nmethod* generate_native_wrapper(MacroAssembler* masm,
480                                           const methodHandle& method,
481                                           int compile_id,
482                                           BasicType* sig_bt,
483                                           VMRegPair* regs,
484                                           BasicType ret_type);
485 
486   // Block before entering a JNI critical method
487   static void block_for_jni_critical(JavaThread* thread);
488 
489   // Pin/Unpin object
490   static oopDesc* pin_object(JavaThread* thread, oopDesc* obj);
491   static void unpin_object(JavaThread* thread, oopDesc* obj);
492 
493   // A compiled caller has just called the interpreter, but compiled code
494   // exists.  Patch the caller so he no longer calls into the interpreter.
495   static void fixup_callers_callsite(Method* moop, address ret_pc);
496   static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
497 
498   // Slow-path Locking and Unlocking
499   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
500   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
501 
502   // Resolving of calls
503   static address resolve_static_call_C     (JavaThread *thread);
504   static address resolve_virtual_call_C    (JavaThread *thread);
505   static address resolve_opt_virtual_call_C(JavaThread *thread);
506 
507   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
508   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
509                                oopDesc* dest, jint dest_pos,
510                                jint length, JavaThread* thread);
511 
512   // handle ic miss with caller being compiled code
513   // wrong method handling (inline cache misses, zombie methods)
514   static address handle_wrong_method(JavaThread* thread);
515   static address handle_wrong_method_abstract(JavaThread* thread);
516   static address handle_wrong_method_ic_miss(JavaThread* thread);
517 
518   static address handle_unsafe_access(JavaThread* thread, address next_pc);
519 
520 #ifndef PRODUCT
521 
522   // Collect and print inline cache miss statistics
523  private:
524   enum { maxICmiss_count = 100 };
525   static int     _ICmiss_index;                  // length of IC miss histogram
526   static int     _ICmiss_count[maxICmiss_count]; // miss counts
527   static address _ICmiss_at[maxICmiss_count];    // miss addresses
528   static void trace_ic_miss(address at);
529 
530  public:
531   static int _throw_null_ctr;                    // throwing a null-pointer exception
532   static int _ic_miss_ctr;                       // total # of IC misses
533   static int _wrong_method_ctr;
534   static int _resolve_static_ctr;
535   static int _resolve_virtual_ctr;
536   static int _resolve_opt_virtual_ctr;
537   static int _implicit_null_throws;
538   static int _implicit_div0_throws;
539 
540   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
541   static int _jshort_array_copy_ctr;       // Slow-path short array copy
542   static int _jint_array_copy_ctr;         // Slow-path int array copy
543   static int _jlong_array_copy_ctr;        // Slow-path long array copy
544   static int _oop_array_copy_ctr;          // Slow-path oop array copy
545   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
546   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
547   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
548   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
549 
550   static int _new_instance_ctr;            // 'new' object requires GC
551   static int _new_array_ctr;               // 'new' array requires GC
552   static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
553   static int _find_handler_ctr;            // find exception handler
554   static int _rethrow_ctr;                 // rethrow exception
555   static int _mon_enter_stub_ctr;          // monitor enter stub
556   static int _mon_exit_stub_ctr;           // monitor exit stub
557   static int _mon_enter_ctr;               // monitor enter slow
558   static int _mon_exit_ctr;                // monitor exit slow
559   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
560 
561   // Statistics code
562   // stats for "normal" compiled calls (non-interface)
563   static int     _nof_normal_calls;              // total # of calls
564   static int     _nof_optimized_calls;           // total # of statically-bound calls
565   static int     _nof_inlined_calls;             // total # of inlined normal calls
566   static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)
567   static int     _nof_inlined_static_calls;      // total # of inlined static calls
568   // stats for compiled interface calls
569   static int     _nof_interface_calls;           // total # of compiled calls
570   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
571   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
572   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
573   // stats for runtime exceptions
574   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
575 
576  public: // for compiler
577   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
578   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
579   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
580   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
581   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
582   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
583   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
584   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
585   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
586   static void print_call_statistics(int comp_total);
587   static void print_statistics();
588   static void print_ic_miss_histogram();
589 
590 #endif // PRODUCT
591 };
592 
593 
594 // ---------------------------------------------------------------------------
595 // Implementation of AdapterHandlerLibrary
596 //
597 // This library manages argument marshaling adapters and native wrappers.
598 // There are 2 flavors of adapters: I2C and C2I.
599 //
600 // The I2C flavor takes a stock interpreted call setup, marshals the
601 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
602 // code_begin().  It is broken to call it without an nmethod assigned.
603 // The usual behavior is to lift any register arguments up out of the
604 // stack and possibly re-pack the extra arguments to be contiguous.
605 // I2C adapters will save what the interpreter's stack pointer will be
606 // after arguments are popped, then adjust the interpreter's frame
607 // size to force alignment and possibly to repack the arguments.
608 // After re-packing, it jumps to the compiled code start.  There are
609 // no safepoints in this adapter code and a GC cannot happen while
610 // marshaling is in progress.
611 //
612 // The C2I flavor takes a stock compiled call setup plus the target method in
613 // Rmethod, marshals the arguments for an interpreted call and jumps to
614 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
615 // setup.  Compiled frames are fixed-size and the args are likely not in the
616 // right place.  Hence all the args will likely be copied into the
617 // interpreter's frame, forcing that frame to grow.  The compiled frame's
618 // outgoing stack args will be dead after the copy.
619 //
620 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
621 // also perform an official frame push & pop.  They have a call to the native
622 // routine in their middles and end in a return (instead of ending in a jump).
623 // The native wrappers are stored in real nmethods instead of the BufferBlobs
624 // used by the adapters.  The code generation happens here because it's very
625 // similar to what the adapters have to do.
626 
627 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
628   friend class AdapterHandlerTable;
629 
630  private:
631   AdapterFingerPrint* _fingerprint;
632   address _i2c_entry;
633   address _c2i_entry;
634   address _c2i_unverified_entry;
635 
636 #ifdef ASSERT
637   // Captures code and signature used to generate this adapter when
638   // verifying adapter equivalence.
639   unsigned char* _saved_code;
640   int            _saved_code_length;
641 #endif
642 
643   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
644     _fingerprint = fingerprint;
645     _i2c_entry = i2c_entry;
646     _c2i_entry = c2i_entry;
647     _c2i_unverified_entry = c2i_unverified_entry;
648 #ifdef ASSERT
649     _saved_code = NULL;
650     _saved_code_length = 0;
651 #endif
652   }
653 
654   void deallocate();
655 
656   // should never be used
657   AdapterHandlerEntry();
658 
659  public:
660   address get_i2c_entry()            const { return _i2c_entry; }
661   address get_c2i_entry()            const { return _c2i_entry; }
662   address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
663   address base_address();
664   void relocate(address new_base);
665 
666   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
667 
668   AdapterHandlerEntry* next() {
669     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
670   }
671 
672 #ifdef ASSERT
673   // Used to verify that code generated for shared adapters is equivalent
674   void save_code   (unsigned char* code, int length);
675   bool compare_code(unsigned char* code, int length);
676 #endif
677 
678   //virtual void print_on(outputStream* st) const;  DO NOT USE
679   void print_adapter_on(outputStream* st) const;
680 };
681 
682 // This class is used only with DumpSharedSpaces==true. It holds extra information
683 // that's used only during CDS dump time.
684 // For details, see comments around Method::link_method()
685 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
686   address               _c2i_entry_trampoline;   // allocated from shared spaces "MC" region
687   AdapterHandlerEntry** _adapter_trampoline;     // allocated from shared spaces "MD" region
688 
689 public:
690   address get_c2i_entry_trampoline()             const { return _c2i_entry_trampoline; }
691   AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
692   void init() NOT_CDS_RETURN;
693 };
694 
695 
696 class AdapterHandlerLibrary: public AllStatic {
697  private:
698   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
699   static AdapterHandlerTable* _adapters;
700   static AdapterHandlerEntry* _abstract_method_handler;
701   static BufferBlob* buffer_blob();
702   static void initialize();
703   static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
704 
705  public:
706 
707   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
708                                         address i2c_entry, address c2i_entry, address c2i_unverified_entry);
709   static void create_native_wrapper(const methodHandle& method);
710   static AdapterHandlerEntry* get_adapter(const methodHandle& method);
711 
712   static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
713   static void print_handler_on(outputStream* st, const CodeBlob* b);
714   static bool contains(const CodeBlob* b);
715 #ifndef PRODUCT
716   static void print_statistics();
717 #endif // PRODUCT
718 
719 };
720 
721 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP