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 "asm/codeBuffer.hpp"
 29 #include "code/codeBlob.hpp"
 30 #include "code/vmreg.hpp"
 31 #include "interpreter/bytecodeTracer.hpp"
 32 #include "interpreter/linkResolver.hpp"
 33 #include "memory/allocation.hpp"
 34 #include "memory/resourceArea.hpp"
 35 #include "runtime/signature.hpp"
 36 #include "utilities/hashtable.hpp"
 37 #include "utilities/macros.hpp"
 38 
 39 class AdapterHandlerEntry;
 40 class AdapterHandlerTable;
 41 class AdapterFingerPrint;
 42 class vframeStream;
 43 class SigEntry;
 44 
 45 // Runtime is the base class for various runtime interfaces
 46 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
 47 // shared functionality such as exception forwarding (C++ to
 48 // Java exceptions), locking/unlocking mechanisms, statistical
 49 // information, etc.
 50 
 51 class SharedRuntime: AllStatic {
 52   friend class VMStructs;
 53 
 54  private:
 55   static bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
 56                                           CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
 57                                           Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
 58   static methodHandle resolve_sub_helper(bool is_virtual, bool is_optimized, bool* caller_is_c1, TRAPS);
 59 
 60   // Shared stub locations
 61 
 62   static RuntimeStub*        _wrong_method_blob;
 63   static RuntimeStub*        _wrong_method_abstract_blob;
 64   static RuntimeStub*        _ic_miss_blob;
 65   static RuntimeStub*        _resolve_opt_virtual_call_blob;
 66   static RuntimeStub*        _resolve_virtual_call_blob;
 67   static RuntimeStub*        _resolve_static_call_blob;
 68 
 69   static DeoptimizationBlob* _deopt_blob;
 70 
 71   static SafepointBlob*      _polling_page_vectors_safepoint_handler_blob;
 72   static SafepointBlob*      _polling_page_safepoint_handler_blob;
 73   static SafepointBlob*      _polling_page_return_handler_blob;
 74 
 75 #ifdef COMPILER2
 76   static UncommonTrapBlob*   _uncommon_trap_blob;
 77 #endif // COMPILER2
 78 
 79 #ifndef PRODUCT
 80   // Counters
 81   static int64_t _nof_megamorphic_calls;         // total # of megamorphic calls (through vtable)
 82 #endif // !PRODUCT
 83 
 84  private:
 85   enum { POLL_AT_RETURN,  POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
 86   static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
 87   static RuntimeStub*   generate_resolve_blob(address destination, const char* name);
 88  public:
 89   static void generate_stubs(void);
 90 
 91   // max bytes for each dtrace string parameter
 92   enum { max_dtrace_string_size = 256 };
 93 
 94   // The following arithmetic routines are used on platforms that do
 95   // not have machine instructions to implement their functionality.
 96   // Do not remove these.
 97 
 98   // long arithmetics
 99   static jlong   lmul(jlong y, jlong x);
100   static jlong   ldiv(jlong y, jlong x);
101   static jlong   lrem(jlong y, jlong x);
102 
103   // float and double remainder
104   static jfloat  frem(jfloat  x, jfloat  y);
105   static jdouble drem(jdouble x, jdouble y);
106 
107 
108 #ifdef _WIN64
109   // Workaround for fmod issue in the Windows x64 CRT
110   static double fmod_winx64(double x, double y);
111 #endif
112 
113 #ifdef __SOFTFP__
114   static jfloat  fadd(jfloat x, jfloat y);
115   static jfloat  fsub(jfloat x, jfloat y);
116   static jfloat  fmul(jfloat x, jfloat y);
117   static jfloat  fdiv(jfloat x, jfloat y);
118 
119   static jdouble dadd(jdouble x, jdouble y);
120   static jdouble dsub(jdouble x, jdouble y);
121   static jdouble dmul(jdouble x, jdouble y);
122   static jdouble ddiv(jdouble x, jdouble y);
123 #endif // __SOFTFP__
124 
125   // float conversion (needs to set appropriate rounding mode)
126   static jint    f2i (jfloat  x);
127   static jlong   f2l (jfloat  x);
128   static jint    d2i (jdouble x);
129   static jlong   d2l (jdouble x);
130   static jfloat  d2f (jdouble x);
131   static jfloat  l2f (jlong   x);
132   static jdouble l2d (jlong   x);
133 
134 #ifdef __SOFTFP__
135   static jfloat  i2f (jint    x);
136   static jdouble i2d (jint    x);
137   static jdouble f2d (jfloat  x);
138 #endif // __SOFTFP__
139 
140   // double trigonometrics and transcendentals
141   static jdouble dsin(jdouble x);
142   static jdouble dcos(jdouble x);
143   static jdouble dtan(jdouble x);
144   static jdouble dlog(jdouble x);
145   static jdouble dlog10(jdouble x);
146   static jdouble dexp(jdouble x);
147   static jdouble dpow(jdouble x, jdouble y);
148 
149 #if defined(__SOFTFP__) || defined(E500V2)
150   static double dabs(double f);
151 #endif
152 
153 #if defined(__SOFTFP__) || defined(PPC)
154   static double dsqrt(double f);
155 #endif
156 
157   // Montgomery multiplication
158   static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
159                                   jint len, jlong inv, jint *m_ints);
160   static void montgomery_square(jint *a_ints, jint *n_ints,
161                                 jint len, jlong inv, jint *m_ints);
162 
163 #ifdef __SOFTFP__
164   // C++ compiler generates soft float instructions as well as passing
165   // float and double in registers.
166   static int  fcmpl(float x, float y);
167   static int  fcmpg(float x, float y);
168   static int  dcmpl(double x, double y);
169   static int  dcmpg(double x, double y);
170 
171   static int unordered_fcmplt(float x, float y);
172   static int unordered_dcmplt(double x, double y);
173   static int unordered_fcmple(float x, float y);
174   static int unordered_dcmple(double x, double y);
175   static int unordered_fcmpge(float x, float y);
176   static int unordered_dcmpge(double x, double y);
177   static int unordered_fcmpgt(float x, float y);
178   static int unordered_dcmpgt(double x, double y);
179 
180   static float  fneg(float f);
181   static double dneg(double f);
182 #endif
183 
184   // exception handling across interpreter/compiler boundaries
185   static address raw_exception_handler_for_return_address(JavaThread* current, address return_address);
186   static address exception_handler_for_return_address(JavaThread* current, address return_address);
187 
188   // exception handling and implicit exceptions
189   static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
190                                               bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
191   enum ImplicitExceptionKind {
192     IMPLICIT_NULL,
193     IMPLICIT_DIVIDE_BY_ZERO,
194     STACK_OVERFLOW
195   };
196   static void    throw_AbstractMethodError(JavaThread* current);
197   static void    throw_IncompatibleClassChangeError(JavaThread* current);
198   static void    throw_ArithmeticException(JavaThread* current);
199   static void    throw_NullPointerException(JavaThread* current);
200   static void    throw_NullPointerException_at_call(JavaThread* current);
201   static void    throw_StackOverflowError(JavaThread* current);
202   static void    throw_delayed_StackOverflowError(JavaThread* current);
203   static void    throw_StackOverflowError_common(JavaThread* current, bool delayed);
204   static address continuation_for_implicit_exception(JavaThread* current,
205                                                      address faulting_pc,
206                                                      ImplicitExceptionKind exception_kind);
207 
208   // Post-slow-path-allocation, pre-initializing-stores step for
209   // implementing e.g. ReduceInitialCardMarks
210   static void on_slowpath_allocation_exit(JavaThread* current);
211 
212   static void enable_stack_reserved_zone(JavaThread* current);
213   static frame look_for_reserved_stack_annotated_method(JavaThread* current, 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* current, Handle h_exception);
262   static void throw_and_post_jvmti_exception(JavaThread* current, 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 
270   static oop retrieve_receiver(Symbol* sig, frame caller);
271 
272   static void register_finalizer(JavaThread* thread, oopDesc* obj);
273 
274   // dtrace notifications
275   static int dtrace_object_alloc(oopDesc* o, int size);
276   static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int 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, bool* caller_is_c1, 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, bool& is_optimized, bool caller_is_c1, 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(bool& is_static_call, bool& is_optimized, bool& caller_is_c1, 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(bool& is_optimized, bool& caller_is_c1, 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   static address entry_for_handle_wrong_method(methodHandle callee_method, bool is_static_call, bool is_optimized, bool caller_is_c1) {
346     assert(callee_method->verified_code_entry() != NULL, "Jump to zero!");
347     assert(callee_method->verified_inline_code_entry() != NULL, "Jump to zero!");
348     assert(callee_method->verified_inline_ro_code_entry() != NULL, "Jump to zero!");
349     if (caller_is_c1) {
350       return callee_method->verified_inline_code_entry();
351     } else if (is_static_call || is_optimized) {
352       return callee_method->verified_code_entry();
353     } else {
354       return callee_method->verified_inline_ro_code_entry();
355     }
356   }
357 
358  private:
359   static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
360   static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
361 
362   static Method* extract_attached_method(vframeStream& vfst);
363 
364 #if defined(X86) && defined(COMPILER1)
365   // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
366   static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
367 #endif // X86 && COMPILER1
368 
369  public:
370 
371   // Read the array of BasicTypes from a Java signature, and compute where
372   // compiled Java code would like to put the results.  Values in reg_lo and
373   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
374   // registers, those above refer to 4-byte stack slots.  All stack slots are
375   // based off of the window top.  SharedInfo::stack0 refers to the first usable
376   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
377   // 4-bytes higher.
378   // return value is the maximum number of VMReg stack slots the convention will use.
379   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
380   static int java_calling_convention(const GrowableArray<SigEntry>* sig, VMRegPair* regs) {
381     BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig->length());
382     int total_args_passed = SigEntry::fill_sig_bt(sig, sig_bt);
383     return java_calling_convention(sig_bt, regs, total_args_passed);
384   }
385   static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
386   static const uint java_return_convention_max_int;
387   static const uint java_return_convention_max_float;
388 
389   static void check_member_name_argument_is_last_argument(const methodHandle& method,
390                                                           const BasicType* sig_bt,
391                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
392 
393   // Ditto except for calling C
394   //
395   // C argument in register AND stack slot.
396   // Some architectures require that an argument must be passed in a register
397   // AND in a stack slot. These architectures provide a second VMRegPair array
398   // to be filled by the c_calling_convention method. On other architectures,
399   // NULL is being passed as the second VMRegPair array, so arguments are either
400   // passed in a register OR in a stack slot.
401   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
402                                   int total_args_passed);
403 
404   static int vector_calling_convention(VMRegPair *regs,
405                                        uint num_bits,
406                                        uint total_args_passed);
407 
408   static size_t trampoline_size();
409 
410   // Generate I2C and C2I adapters. These adapters are simple argument marshalling
411   // blobs. Unlike adapters in the tiger and earlier releases the code in these
412   // blobs does not create a new frame and are therefore virtually invisible
413   // to the stack walking code. In general these blobs extend the callers stack
414   // as needed for the conversion of argument locations.
415 
416   // When calling a c2i blob the code will always call the interpreter even if
417   // by the time we reach the blob there is compiled code available. This allows
418   // the blob to pass the incoming stack pointer (the sender sp) in a known
419   // location for the interpreter to record. This is used by the frame code
420   // to correct the sender code to match up with the stack pointer when the
421   // thread left the compiled code. In addition it allows the interpreter
422   // to remove the space the c2i adapter allocated to do its argument conversion.
423 
424   // Although a c2i blob will always run interpreted even if compiled code is
425   // present if we see that compiled code is present the compiled call site
426   // will be patched/re-resolved so that later calls will run compiled.
427 
428   // Additionally a c2i blob need to have a unverified entry because it can be reached
429   // in situations where the call site is an inlined cache site and may go megamorphic.
430 
431   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
432   // that the interpreter before it does any call dispatch will record the current
433   // stack pointer in the interpreter frame. On return it will restore the stack
434   // pointer as needed. This means the i2c adapter code doesn't need any special
435   // handshaking path with compiled code to keep the stack walking correct.
436 
437   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm,
438                                                       int comp_args_on_stack,
439                                                       const GrowableArray<SigEntry>* sig,
440                                                       const VMRegPair* regs,
441                                                       const GrowableArray<SigEntry>* sig_cc,
442                                                       const VMRegPair* regs_cc,
443                                                       const GrowableArray<SigEntry>* sig_cc_ro,
444                                                       const VMRegPair* regs_cc_ro,
445                                                       AdapterFingerPrint* fingerprint,
446                                                       AdapterBlob*& new_adapter,
447                                                       bool allocate_code_blob);
448 
449   static void gen_i2c_adapter(MacroAssembler *_masm,
450                               int comp_args_on_stack,
451                               const GrowableArray<SigEntry>* sig,
452                               const VMRegPair *regs);
453 
454   // OSR support
455 
456   // OSR_migration_begin will extract the jvm state from an interpreter
457   // frame (locals, monitors) and store the data in a piece of C heap
458   // storage. This then allows the interpreter frame to be removed from the
459   // stack and the OSR nmethod to be called. That method is called with a
460   // pointer to the C heap storage. This pointer is the return value from
461   // OSR_migration_begin.
462 
463   static intptr_t* OSR_migration_begin(JavaThread *thread);
464 
465   // OSR_migration_end is a trivial routine. It is called after the compiled
466   // method has extracted the jvm state from the C heap that OSR_migration_begin
467   // created. It's entire job is to simply free this storage.
468   static void OSR_migration_end(intptr_t* buf);
469 
470   // Convert a sig into a calling convention register layout
471   // and find interesting things about it.
472   static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
473   static VMReg name_for_receiver();
474 
475   // "Top of Stack" slots that may be unused by the calling convention but must
476   // otherwise be preserved.
477   // On Intel these are not necessary and the value can be zero.
478   // On Sparc this describes the words reserved for storing a register window
479   // when an interrupt occurs.
480   static uint out_preserve_stack_slots();
481 
482   // Stack slots that may be unused by the calling convention but must
483   // otherwise be preserved.  On Intel this includes the return address.
484   // On PowerPC it includes the 4 words holding the old TOC & LR glue.
485   static uint in_preserve_stack_slots();
486 
487   // Is vector's size (in bytes) bigger than a size saved by default?
488   // For example, on x86 16 bytes XMM registers are saved by default.
489   static bool is_wide_vector(int size);
490 
491   // Save and restore a native result
492   static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
493   static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
494 
495   // Generate a native wrapper for a given method.  The method takes arguments
496   // in the Java compiled code convention, marshals them to the native
497   // convention (handlizes oops, etc), transitions to native, makes the call,
498   // returns to java state (possibly blocking), unhandlizes any result and
499   // returns.
500   //
501   // The wrapper may contain special-case code if the given method
502   // is a JNI critical method, or a compiled method handle adapter,
503   // such as _invokeBasic, _linkToVirtual, etc.
504   static nmethod* generate_native_wrapper(MacroAssembler* masm,
505                                           const methodHandle& method,
506                                           int compile_id,
507                                           BasicType* sig_bt,
508                                           VMRegPair* regs,
509                                           BasicType ret_type,
510                                           address critical_entry);
511 
512   // A compiled caller has just called the interpreter, but compiled code
513   // exists.  Patch the caller so he no longer calls into the interpreter.
514   static void fixup_callers_callsite(Method* moop, address ret_pc);
515   static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
516 
517   // Slow-path Locking and Unlocking
518   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
519   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
520 
521   // Resolving of calls
522   static address resolve_static_call_C     (JavaThread* current);
523   static address resolve_virtual_call_C    (JavaThread* current);
524   static address resolve_opt_virtual_call_C(JavaThread* current);
525 
526   static void load_inline_type_fields_in_regs(JavaThread* current, oopDesc* res);
527   static void store_inline_type_fields_to_buf(JavaThread* current, intptr_t res);
528 
529   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
530   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
531                                oopDesc* dest, jint dest_pos,
532                                jint length, JavaThread* thread);
533 
534   // handle ic miss with caller being compiled code
535   // wrong method handling (inline cache misses, zombie methods)
536   static address handle_wrong_method(JavaThread* current);
537   static address handle_wrong_method_abstract(JavaThread* current);
538   static address handle_wrong_method_ic_miss(JavaThread* current);
539   static void allocate_inline_types(JavaThread* current, Method* callee, bool allocate_receiver);
540   static oop allocate_inline_types_impl(JavaThread* current, methodHandle callee, bool allocate_receiver, TRAPS);
541 
542   static address handle_unsafe_access(JavaThread* thread, address next_pc);
543 
544   static BufferedInlineTypeBlob* generate_buffered_inline_type_adapter(const InlineKlass* vk);
545 #ifdef COMPILER2
546   static RuntimeStub* make_native_invoker(address call_target,
547                                           int shadow_space_bytes,
548                                           const GrowableArray<VMReg>& input_registers,
549                                           const GrowableArray<VMReg>& output_registers);
550 #endif
551 
552   static void compute_move_order(const BasicType* in_sig_bt,
553                                  int total_in_args, const VMRegPair* in_regs,
554                                  int total_out_args, VMRegPair* out_regs,
555                                  GrowableArray<int>& arg_order,
556                                  VMRegPair tmp_vmreg);
557 
558 #ifndef PRODUCT
559 
560   // Collect and print inline cache miss statistics
561  private:
562   enum { maxICmiss_count = 100 };
563   static int     _ICmiss_index;                  // length of IC miss histogram
564   static int     _ICmiss_count[maxICmiss_count]; // miss counts
565   static address _ICmiss_at[maxICmiss_count];    // miss addresses
566   static void trace_ic_miss(address at);
567 
568  public:
569   static int _ic_miss_ctr;                       // total # of IC misses
570   static int _wrong_method_ctr;
571   static int _resolve_static_ctr;
572   static int _resolve_virtual_ctr;
573   static int _resolve_opt_virtual_ctr;
574   static int _implicit_null_throws;
575   static int _implicit_div0_throws;
576 
577   static int _jbyte_array_copy_ctr;        // Slow-path byte array copy
578   static int _jshort_array_copy_ctr;       // Slow-path short array copy
579   static int _jint_array_copy_ctr;         // Slow-path int array copy
580   static int _jlong_array_copy_ctr;        // Slow-path long array copy
581   static int _oop_array_copy_ctr;          // Slow-path oop array copy
582   static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast
583   static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks
584   static int _generic_array_copy_ctr;      // Slow-path includes type decoding
585   static int _slow_array_copy_ctr;         // Slow-path failed out to a method call
586 
587   static int _new_instance_ctr;            // 'new' object requires GC
588   static int _new_array_ctr;               // 'new' array requires GC
589   static int _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
590   static int _find_handler_ctr;            // find exception handler
591   static int _rethrow_ctr;                 // rethrow exception
592   static int _mon_enter_stub_ctr;          // monitor enter stub
593   static int _mon_exit_stub_ctr;           // monitor exit stub
594   static int _mon_enter_ctr;               // monitor enter slow
595   static int _mon_exit_ctr;                // monitor exit slow
596   static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check
597 
598   // Statistics code
599   // stats for "normal" compiled calls (non-interface)
600   static int64_t _nof_normal_calls;               // total # of calls
601   static int64_t _nof_optimized_calls;            // total # of statically-bound calls
602   static int64_t _nof_inlined_calls;              // total # of inlined normal calls
603   static int64_t _nof_static_calls;               // total # of calls to static methods or super methods (invokespecial)
604   static int64_t _nof_inlined_static_calls;       // total # of inlined static calls
605   // stats for compiled interface calls
606   static int64_t _nof_interface_calls;            // total # of compiled calls
607   static int64_t _nof_optimized_interface_calls;  // total # of statically-bound interface calls
608   static int64_t _nof_inlined_interface_calls;    // total # of inlined interface calls
609   static int64_t _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
610 
611  public: // for compiler
612   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
613   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
614   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
615   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
616   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
617   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
618   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
619   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
620   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
621   static void print_call_statistics(uint64_t comp_total);
622   static void print_statistics();
623   static void print_ic_miss_histogram();
624 
625 #endif // PRODUCT
626 };
627 
628 
629 // ---------------------------------------------------------------------------
630 // Implementation of AdapterHandlerLibrary
631 //
632 // This library manages argument marshaling adapters and native wrappers.
633 // There are 2 flavors of adapters: I2C and C2I.
634 //
635 // The I2C flavor takes a stock interpreted call setup, marshals the
636 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
637 // code_begin().  It is broken to call it without an nmethod assigned.
638 // The usual behavior is to lift any register arguments up out of the
639 // stack and possibly re-pack the extra arguments to be contiguous.
640 // I2C adapters will save what the interpreter's stack pointer will be
641 // after arguments are popped, then adjust the interpreter's frame
642 // size to force alignment and possibly to repack the arguments.
643 // After re-packing, it jumps to the compiled code start.  There are
644 // no safepoints in this adapter code and a GC cannot happen while
645 // marshaling is in progress.
646 //
647 // The C2I flavor takes a stock compiled call setup plus the target method in
648 // Rmethod, marshals the arguments for an interpreted call and jumps to
649 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
650 // setup.  Compiled frames are fixed-size and the args are likely not in the
651 // right place.  Hence all the args will likely be copied into the
652 // interpreter's frame, forcing that frame to grow.  The compiled frame's
653 // outgoing stack args will be dead after the copy.
654 //
655 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
656 // also perform an official frame push & pop.  They have a call to the native
657 // routine in their middles and end in a return (instead of ending in a jump).
658 // The native wrappers are stored in real nmethods instead of the BufferBlobs
659 // used by the adapters.  The code generation happens here because it's very
660 // similar to what the adapters have to do.
661 
662 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
663   friend class AdapterHandlerTable;
664   friend class AdapterHandlerLibrary;
665 
666  private:
667   AdapterFingerPrint* _fingerprint;
668   address _i2c_entry;
669   address _c2i_entry;
670   address _c2i_inline_entry;
671   address _c2i_inline_ro_entry;
672   address _c2i_unverified_entry;
673   address _c2i_unverified_inline_entry;
674   address _c2i_no_clinit_check_entry;
675 
676   // Support for scalarized inline type calling convention
677   const GrowableArray<SigEntry>* _sig_cc;
678 
679 #ifdef ASSERT
680   // Captures code and signature used to generate this adapter when
681   // verifying adapter equivalence.
682   unsigned char* _saved_code;
683   int            _saved_code_length;
684 #endif
685 
686   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_inline_entry,
687             address c2i_inline_ro_entry, address c2i_unverified_entry, address c2i_unverified_inline_entry, address c2i_no_clinit_check_entry) {
688     _fingerprint = fingerprint;
689     _i2c_entry = i2c_entry;
690     _c2i_entry = c2i_entry;
691     _c2i_inline_entry = c2i_inline_entry;
692     _c2i_inline_ro_entry = c2i_inline_ro_entry;
693     _c2i_unverified_entry = c2i_unverified_entry;
694     _c2i_unverified_inline_entry = c2i_unverified_inline_entry;
695     _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry;
696     _sig_cc = NULL;
697 #ifdef ASSERT
698     _saved_code_length = 0;
699 #endif
700   }
701 
702   void deallocate();
703 
704   // should never be used
705   AdapterHandlerEntry();
706 
707  public:
708   address get_i2c_entry()                   const { return _i2c_entry; }
709   address get_c2i_entry()                   const { return _c2i_entry; }
710   address get_c2i_inline_entry()            const { return _c2i_inline_entry; }
711   address get_c2i_inline_ro_entry()         const { return _c2i_inline_ro_entry; }
712   address get_c2i_unverified_entry()        const { return _c2i_unverified_entry; }
713   address get_c2i_unverified_inline_entry() const { return _c2i_unverified_inline_entry; }
714   address get_c2i_no_clinit_check_entry()   const { return _c2i_no_clinit_check_entry; }
715 
716   address base_address();
717   void relocate(address new_base);
718 
719   // Support for scalarized inline type calling convention
720   void set_sig_cc(const GrowableArray<SigEntry>* sig)  { _sig_cc = sig; }
721   const GrowableArray<SigEntry>* get_sig_cc()    const { return _sig_cc; }
722 
723   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
724 
725   AdapterHandlerEntry* next() {
726     return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
727   }
728 
729 #ifdef ASSERT
730   // Used to verify that code generated for shared adapters is equivalent
731   void save_code   (unsigned char* code, int length);
732   bool compare_code(AdapterHandlerEntry* other);
733 #endif
734 
735   //virtual void print_on(outputStream* st) const;  DO NOT USE
736   void print_adapter_on(outputStream* st) const;
737 };
738 
739 class CompiledEntrySignature;
740 
741 class AdapterHandlerLibrary: public AllStatic {
742   friend class SharedRuntime;
743  private:
744   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
745   static AdapterHandlerTable* _adapters;
746   static AdapterHandlerEntry* _abstract_method_handler;
747   static AdapterHandlerEntry* _no_arg_handler;
748   static AdapterHandlerEntry* _int_arg_handler;
749   static AdapterHandlerEntry* _obj_arg_handler;
750   static AdapterHandlerEntry* _obj_int_arg_handler;
751   static AdapterHandlerEntry* _obj_obj_arg_handler;
752 
753   static BufferBlob* buffer_blob();
754   static void initialize();
755   static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
756                                              CompiledEntrySignature& ces,
757                                              bool allocate_code_blob);
758   static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
759  public:
760 
761   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
762                                         address i2c_entry, address c2i_entry, address c2i_inline_entry, address c2i_inline_ro_entry,
763                                         address c2i_unverified_entry, address c2i_unverified_inline_entry, address c2i_no_clinit_check_entry = NULL);
764   static void create_native_wrapper(const methodHandle& method);
765   static AdapterHandlerEntry* get_adapter(const methodHandle& method);
766 
767   static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
768   static void print_handler_on(outputStream* st, const CodeBlob* b);
769   static bool contains(const CodeBlob* b);
770 #ifndef PRODUCT
771   static void print_statistics();
772 #endif // PRODUCT
773 
774 };
775 
776 // Utility class for computing the calling convention of the 3 types
777 // of compiled method entries:
778 //     Method::_from_compiled_entry               - sig_cc
779 //     Method::_from_compiled_inline_ro_entry     - sig_cc_ro
780 //     Method::_from_compiled_inline_entry        - sig
781 class CompiledEntrySignature : public StackObj {
782   Method* _method;
783   int  _num_inline_args;
784   bool _has_inline_recv;
785   GrowableArray<SigEntry> *_sig;
786   GrowableArray<SigEntry> *_sig_cc;
787   GrowableArray<SigEntry> *_sig_cc_ro;
788   VMRegPair* _regs;
789   VMRegPair* _regs_cc;
790   VMRegPair* _regs_cc_ro;
791 
792   int _args_on_stack;
793   int _args_on_stack_cc;
794   int _args_on_stack_cc_ro;
795 
796   bool _c1_needs_stack_repair;
797   bool _c2_needs_stack_repair;
798 
799 public:
800   Method* method()                     const { return _method; }
801 
802   // Used by Method::_from_compiled_inline_entry
803   GrowableArray<SigEntry>& sig()       const { return *_sig; }
804 
805   // Used by Method::_from_compiled_entry
806   GrowableArray<SigEntry>& sig_cc()    const { return *_sig_cc; }
807 
808   // Used by Method::_from_compiled_inline_ro_entry
809   GrowableArray<SigEntry>& sig_cc_ro() const { return *_sig_cc_ro; }
810 
811   VMRegPair* regs()                    const { return _regs; }
812   VMRegPair* regs_cc()                 const { return _regs_cc; }
813   VMRegPair* regs_cc_ro()              const { return _regs_cc_ro; }
814 
815   int args_on_stack()                  const { return _args_on_stack; }
816   int args_on_stack_cc()               const { return _args_on_stack_cc; }
817   int args_on_stack_cc_ro()            const { return _args_on_stack_cc_ro; }
818 
819   int  num_inline_args()               const { return _num_inline_args; }
820   bool has_inline_arg()                const { return _num_inline_args > 0; }
821   bool has_inline_recv()               const { return _has_inline_recv; }
822 
823   bool has_scalarized_args()           const { return _sig != _sig_cc; }
824   bool c1_needs_stack_repair()         const { return _c1_needs_stack_repair; }
825   bool c2_needs_stack_repair()         const { return _c2_needs_stack_repair; }
826   CodeOffsets::Entries c1_inline_ro_entry_type() const;
827 
828   CompiledEntrySignature(Method* method = NULL);
829   void compute_calling_conventions();
830 
831 private:
832   int compute_scalarized_cc(GrowableArray<SigEntry>*& sig_cc, VMRegPair*& regs_cc, bool scalar_receiver);
833 };
834 
835 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP