Thu, 08 Jul 2010 14:29:44 -0700
6965184: possible races in make_not_entrant_or_zombie
Reviewed-by: kvn
1 /*
2 * Copyright (c) 1997, 2010, 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 */
25 class AdapterHandlerEntry;
26 class AdapterHandlerTable;
27 class AdapterFingerPrint;
28 class vframeStream;
30 // Runtime is the base class for various runtime interfaces
31 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
32 // shared functionality such as exception forwarding (C++ to
33 // Java exceptions), locking/unlocking mechanisms, statistical
34 // information, etc.
36 class SharedRuntime: AllStatic {
37 private:
38 static methodHandle resolve_sub_helper(JavaThread *thread,
39 bool is_virtual,
40 bool is_optimized, TRAPS);
42 // Shared stub locations
44 static RuntimeStub* _wrong_method_blob;
45 static RuntimeStub* _ic_miss_blob;
46 static RuntimeStub* _resolve_opt_virtual_call_blob;
47 static RuntimeStub* _resolve_virtual_call_blob;
48 static RuntimeStub* _resolve_static_call_blob;
50 static SafepointBlob* _polling_page_safepoint_handler_blob;
51 static SafepointBlob* _polling_page_return_handler_blob;
52 #ifdef COMPILER2
53 static ExceptionBlob* _exception_blob;
54 static UncommonTrapBlob* _uncommon_trap_blob;
55 #endif // COMPILER2
57 #ifndef PRODUCT
59 // Counters
60 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
62 #endif // !PRODUCT
63 public:
65 // max bytes for each dtrace string parameter
66 enum { max_dtrace_string_size = 256 };
68 // The following arithmetic routines are used on platforms that do
69 // not have machine instructions to implement their functionality.
70 // Do not remove these.
72 // long arithmetics
73 static jlong lmul(jlong y, jlong x);
74 static jlong ldiv(jlong y, jlong x);
75 static jlong lrem(jlong y, jlong x);
77 // float and double remainder
78 static jfloat frem(jfloat x, jfloat y);
79 static jdouble drem(jdouble x, jdouble y);
81 // float conversion (needs to set appropriate rounding mode)
82 static jint f2i (jfloat x);
83 static jlong f2l (jfloat x);
84 static jint d2i (jdouble x);
85 static jlong d2l (jdouble x);
86 static jfloat d2f (jdouble x);
87 static jfloat l2f (jlong x);
88 static jdouble l2d (jlong x);
90 // double trigonometrics and transcendentals
91 static jdouble dsin(jdouble x);
92 static jdouble dcos(jdouble x);
93 static jdouble dtan(jdouble x);
94 static jdouble dlog(jdouble x);
95 static jdouble dlog10(jdouble x);
96 static jdouble dexp(jdouble x);
97 static jdouble dpow(jdouble x, jdouble y);
99 // exception handling across interpreter/compiler boundaries
100 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
101 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
103 #ifndef SERIALGC
104 // G1 write barriers
105 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
106 static void g1_wb_post(void* card_addr, JavaThread* thread);
107 #endif // !SERIALGC
109 // exception handling and implicit exceptions
110 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
111 bool force_unwind, bool top_frame_only);
112 enum ImplicitExceptionKind {
113 IMPLICIT_NULL,
114 IMPLICIT_DIVIDE_BY_ZERO,
115 STACK_OVERFLOW
116 };
117 static void throw_AbstractMethodError(JavaThread* thread);
118 static void throw_IncompatibleClassChangeError(JavaThread* thread);
119 static void throw_ArithmeticException(JavaThread* thread);
120 static void throw_NullPointerException(JavaThread* thread);
121 static void throw_NullPointerException_at_call(JavaThread* thread);
122 static void throw_StackOverflowError(JavaThread* thread);
123 static address continuation_for_implicit_exception(JavaThread* thread,
124 address faulting_pc,
125 ImplicitExceptionKind exception_kind);
127 // Shared stub locations
128 static address get_poll_stub(address pc);
130 static address get_ic_miss_stub() {
131 assert(_ic_miss_blob!= NULL, "oops");
132 return _ic_miss_blob->instructions_begin();
133 }
135 static address get_handle_wrong_method_stub() {
136 assert(_wrong_method_blob!= NULL, "oops");
137 return _wrong_method_blob->instructions_begin();
138 }
140 #ifdef COMPILER2
141 static void generate_uncommon_trap_blob(void);
142 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
143 #endif // COMPILER2
145 static address get_resolve_opt_virtual_call_stub(){
146 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
147 return _resolve_opt_virtual_call_blob->instructions_begin();
148 }
149 static address get_resolve_virtual_call_stub() {
150 assert(_resolve_virtual_call_blob != NULL, "oops");
151 return _resolve_virtual_call_blob->instructions_begin();
152 }
153 static address get_resolve_static_call_stub() {
154 assert(_resolve_static_call_blob != NULL, "oops");
155 return _resolve_static_call_blob->instructions_begin();
156 }
158 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
159 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
161 // Counters
162 #ifndef PRODUCT
163 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
164 #endif // PRODUCT
166 // Helper routine for full-speed JVMTI exception throwing support
167 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
168 static void throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message = NULL);
170 // RedefineClasses() tracing support for obsolete method entry
171 static int rc_trace_method_entry(JavaThread* thread, methodOopDesc* m);
173 // To be used as the entry point for unresolved native methods.
174 static address native_method_throw_unsatisfied_link_error_entry();
176 // bytecode tracing is only used by the TraceBytecodes
177 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
179 // Used to back off a spin lock that is under heavy contention
180 static void yield_all(JavaThread* thread, int attempts = 0);
182 static oop retrieve_receiver( symbolHandle sig, frame caller );
184 static void register_finalizer(JavaThread* thread, oopDesc* obj);
186 // dtrace notifications
187 static int dtrace_object_alloc(oopDesc* o);
188 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
189 static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m);
190 static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m);
192 // Utility method for retrieving the Java thread id, returns 0 if the
193 // thread is not a well formed Java thread.
194 static jlong get_java_tid(Thread* thread);
197 // used by native wrappers to reenable yellow if overflow happened in native code
198 static void reguard_yellow_pages();
200 /**
201 * Fill in the "X cannot be cast to a Y" message for ClassCastException
202 *
203 * @param thr the current thread
204 * @param name the name of the class of the object attempted to be cast
205 * @return the dynamically allocated exception message (must be freed
206 * by the caller using a resource mark)
207 *
208 * BCP must refer to the current 'checkcast' opcode for the frame
209 * on top of the stack.
210 * The caller (or one of it's callers) must use a ResourceMark
211 * in order to correctly free the result.
212 */
213 static char* generate_class_cast_message(JavaThread* thr, const char* name);
215 /**
216 * Fill in the message for a WrongMethodTypeException
217 *
218 * @param thr the current thread
219 * @param mtype (optional) expected method type (or argument class)
220 * @param mhandle (optional) actual method handle (or argument)
221 * @return the dynamically allocated exception message
222 *
223 * BCP for the frame on top of the stack must refer to an
224 * 'invokevirtual' op for a method handle, or an 'invokedyamic' op.
225 * The caller (or one of its callers) must use a ResourceMark
226 * in order to correctly free the result.
227 */
228 static char* generate_wrong_method_type_message(JavaThread* thr,
229 oopDesc* mtype = NULL,
230 oopDesc* mhandle = NULL);
232 /** Return non-null if the mtype is a klass or Class, not a MethodType. */
233 static oop wrong_method_type_is_for_single_argument(JavaThread* thr,
234 oopDesc* mtype);
236 /**
237 * Fill in the "X cannot be cast to a Y" message for ClassCastException
238 *
239 * @param name the name of the class of the object attempted to be cast
240 * @param klass the name of the target klass attempt
241 * @param gripe the specific kind of problem being reported
242 * @return the dynamically allocated exception message (must be freed
243 * by the caller using a resource mark)
244 *
245 * This version does not require access the frame, so it can be called
246 * from interpreted code
247 * The caller (or one of it's callers) must use a ResourceMark
248 * in order to correctly free the result.
249 */
250 static char* generate_class_cast_message(const char* name, const char* klass,
251 const char* gripe = " cannot be cast to ");
253 // Resolves a call site- may patch in the destination of the call into the
254 // compiled code.
255 static methodHandle resolve_helper(JavaThread *thread,
256 bool is_virtual,
257 bool is_optimized, TRAPS);
259 static void generate_stubs(void);
261 private:
262 // deopt blob
263 static void generate_deopt_blob(void);
264 static DeoptimizationBlob* _deopt_blob;
266 public:
267 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
269 // Resets a call-site in compiled code so it will get resolved again.
270 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
272 // In the code prolog, if the klass comparison fails, the inline cache
273 // misses and the call site is patched to megamorphic
274 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
276 // Find the method that called us.
277 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
280 private:
281 static Handle find_callee_info(JavaThread* thread,
282 Bytecodes::Code& bc,
283 CallInfo& callinfo, TRAPS);
284 static Handle find_callee_info_helper(JavaThread* thread,
285 vframeStream& vfst,
286 Bytecodes::Code& bc,
287 CallInfo& callinfo, TRAPS);
289 static address clean_virtual_call_entry();
290 static address clean_opt_virtual_call_entry();
291 static address clean_static_call_entry();
293 public:
295 // Read the array of BasicTypes from a Java signature, and compute where
296 // compiled Java code would like to put the results. Values in reg_lo and
297 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
298 // registers, those above refer to 4-byte stack slots. All stack slots are
299 // based off of the window top. SharedInfo::stack0 refers to the first usable
300 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
301 // 4-bytes higher. So for sparc because the register window save area is at
302 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
303 // will be just above it. (
304 // return value is the maximum number of VMReg stack slots the convention will use.
305 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing);
307 // Ditto except for calling C
308 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
310 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
311 // blobs. Unlike adapters in the tiger and earlier releases the code in these
312 // blobs does not create a new frame and are therefore virtually invisible
313 // to the stack walking code. In general these blobs extend the callers stack
314 // as needed for the conversion of argument locations.
316 // When calling a c2i blob the code will always call the interpreter even if
317 // by the time we reach the blob there is compiled code available. This allows
318 // the blob to pass the incoming stack pointer (the sender sp) in a known
319 // location for the interpreter to record. This is used by the frame code
320 // to correct the sender code to match up with the stack pointer when the
321 // thread left the compiled code. In addition it allows the interpreter
322 // to remove the space the c2i adapter allocated to do it argument conversion.
324 // Although a c2i blob will always run interpreted even if compiled code is
325 // present if we see that compiled code is present the compiled call site
326 // will be patched/re-resolved so that later calls will run compiled.
328 // Aditionally a c2i blob need to have a unverified entry because it can be reached
329 // in situations where the call site is an inlined cache site and may go megamorphic.
331 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
332 // that the interpreter before it does any call dispatch will record the current
333 // stack pointer in the interpreter frame. On return it will restore the stack
334 // pointer as needed. This means the i2c adapter code doesn't need any special
335 // handshaking path with compiled code to keep the stack walking correct.
337 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
338 int total_args_passed,
339 int max_arg,
340 const BasicType *sig_bt,
341 const VMRegPair *regs,
342 AdapterFingerPrint* fingerprint);
344 // OSR support
346 // OSR_migration_begin will extract the jvm state from an interpreter
347 // frame (locals, monitors) and store the data in a piece of C heap
348 // storage. This then allows the interpreter frame to be removed from the
349 // stack and the OSR nmethod to be called. That method is called with a
350 // pointer to the C heap storage. This pointer is the return value from
351 // OSR_migration_begin.
353 static intptr_t* OSR_migration_begin( JavaThread *thread);
355 // OSR_migration_end is a trivial routine. It is called after the compiled
356 // method has extracted the jvm state from the C heap that OSR_migration_begin
357 // created. It's entire job is to simply free this storage.
358 static void OSR_migration_end ( intptr_t* buf);
360 // Convert a sig into a calling convention register layout
361 // and find interesting things about it.
362 static VMRegPair* find_callee_arguments(symbolOop sig, bool has_receiver, int *arg_size);
363 static VMReg name_for_receiver();
365 // "Top of Stack" slots that may be unused by the calling convention but must
366 // otherwise be preserved.
367 // On Intel these are not necessary and the value can be zero.
368 // On Sparc this describes the words reserved for storing a register window
369 // when an interrupt occurs.
370 static uint out_preserve_stack_slots();
372 // Save and restore a native result
373 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
374 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
376 // Generate a native wrapper for a given method. The method takes arguments
377 // in the Java compiled code convention, marshals them to the native
378 // convention (handlizes oops, etc), transitions to native, makes the call,
379 // returns to java state (possibly blocking), unhandlizes any result and
380 // returns.
381 static nmethod *generate_native_wrapper(MacroAssembler* masm,
382 methodHandle method,
383 int total_args_passed,
384 int max_arg,
385 BasicType *sig_bt,
386 VMRegPair *regs,
387 BasicType ret_type );
389 #ifdef HAVE_DTRACE_H
390 // Generate a dtrace wrapper for a given method. The method takes arguments
391 // in the Java compiled code convention, marshals them to the native
392 // convention (handlizes oops, etc), transitions to native, makes the call,
393 // returns to java state (possibly blocking), unhandlizes any result and
394 // returns.
395 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
396 methodHandle method);
398 // dtrace support to convert a Java string to utf8
399 static void get_utf(oopDesc* src, address dst);
400 #endif // def HAVE_DTRACE_H
402 // A compiled caller has just called the interpreter, but compiled code
403 // exists. Patch the caller so he no longer calls into the interpreter.
404 static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc);
406 // Slow-path Locking and Unlocking
407 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
408 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
410 // Resolving of calls
411 static address resolve_static_call_C (JavaThread *thread);
412 static address resolve_virtual_call_C (JavaThread *thread);
413 static address resolve_opt_virtual_call_C(JavaThread *thread);
415 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
416 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
417 oopDesc* dest, jint dest_pos,
418 jint length, JavaThread* thread);
420 // handle ic miss with caller being compiled code
421 // wrong method handling (inline cache misses, zombie methods)
422 static address handle_wrong_method(JavaThread* thread);
423 static address handle_wrong_method_ic_miss(JavaThread* thread);
425 #ifndef PRODUCT
427 // Collect and print inline cache miss statistics
428 private:
429 enum { maxICmiss_count = 100 };
430 static int _ICmiss_index; // length of IC miss histogram
431 static int _ICmiss_count[maxICmiss_count]; // miss counts
432 static address _ICmiss_at[maxICmiss_count]; // miss addresses
433 static void trace_ic_miss(address at);
435 public:
436 static int _monitor_enter_ctr; // monitor enter slow
437 static int _monitor_exit_ctr; // monitor exit slow
438 static int _throw_null_ctr; // throwing a null-pointer exception
439 static int _ic_miss_ctr; // total # of IC misses
440 static int _wrong_method_ctr;
441 static int _resolve_static_ctr;
442 static int _resolve_virtual_ctr;
443 static int _resolve_opt_virtual_ctr;
444 static int _implicit_null_throws;
445 static int _implicit_div0_throws;
447 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
448 static int _jshort_array_copy_ctr; // Slow-path short array copy
449 static int _jint_array_copy_ctr; // Slow-path int array copy
450 static int _jlong_array_copy_ctr; // Slow-path long array copy
451 static int _oop_array_copy_ctr; // Slow-path oop array copy
452 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
453 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
454 static int _generic_array_copy_ctr; // Slow-path includes type decoding
455 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
457 static int _new_instance_ctr; // 'new' object requires GC
458 static int _new_array_ctr; // 'new' array requires GC
459 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
460 static int _find_handler_ctr; // find exception handler
461 static int _rethrow_ctr; // rethrow exception
462 static int _mon_enter_stub_ctr; // monitor enter stub
463 static int _mon_exit_stub_ctr; // monitor exit stub
464 static int _mon_enter_ctr; // monitor enter slow
465 static int _mon_exit_ctr; // monitor exit slow
466 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
468 // Statistics code
469 // stats for "normal" compiled calls (non-interface)
470 static int _nof_normal_calls; // total # of calls
471 static int _nof_optimized_calls; // total # of statically-bound calls
472 static int _nof_inlined_calls; // total # of inlined normal calls
473 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
474 static int _nof_inlined_static_calls; // total # of inlined static calls
475 // stats for compiled interface calls
476 static int _nof_interface_calls; // total # of compiled calls
477 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
478 static int _nof_inlined_interface_calls; // total # of inlined interface calls
479 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
480 // stats for runtime exceptions
481 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
483 public: // for compiler
484 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
485 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
486 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
487 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
488 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
489 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
490 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
491 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
492 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
493 static void print_call_statistics(int comp_total);
494 static void print_statistics();
495 static void print_ic_miss_histogram();
497 #endif // PRODUCT
498 };
501 // ---------------------------------------------------------------------------
502 // Implementation of AdapterHandlerLibrary
503 //
504 // This library manages argument marshaling adapters and native wrappers.
505 // There are 2 flavors of adapters: I2C and C2I.
506 //
507 // The I2C flavor takes a stock interpreted call setup, marshals the arguments
508 // for a Java-compiled call, and jumps to Rmethod-> code()->
509 // instructions_begin(). It is broken to call it without an nmethod assigned.
510 // The usual behavior is to lift any register arguments up out of the stack
511 // and possibly re-pack the extra arguments to be contigious. I2C adapters
512 // will save what the interpreter's stack pointer will be after arguments are
513 // popped, then adjust the interpreter's frame size to force alignment and
514 // possibly to repack the arguments. After re-packing, it jumps to the
515 // compiled code start. There are no safepoints in this adapter code and a GC
516 // cannot happen while marshaling is in progress.
517 //
518 // The C2I flavor takes a stock compiled call setup plus the target method in
519 // Rmethod, marshals the arguments for an interpreted call and jumps to
520 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
521 // setup. Compiled frames are fixed-size and the args are likely not in the
522 // right place. Hence all the args will likely be copied into the
523 // interpreter's frame, forcing that frame to grow. The compiled frame's
524 // outgoing stack args will be dead after the copy.
525 //
526 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
527 // also perform an offical frame push & pop. They have a call to the native
528 // routine in their middles and end in a return (instead of ending in a jump).
529 // The native wrappers are stored in real nmethods instead of the BufferBlobs
530 // used by the adapters. The code generation happens here because it's very
531 // similar to what the adapters have to do.
533 class AdapterHandlerEntry : public BasicHashtableEntry {
534 friend class AdapterHandlerTable;
536 private:
537 AdapterFingerPrint* _fingerprint;
538 address _i2c_entry;
539 address _c2i_entry;
540 address _c2i_unverified_entry;
542 #ifdef ASSERT
543 // Captures code and signature used to generate this adapter when
544 // verifing adapter equivalence.
545 unsigned char* _saved_code;
546 int _code_length;
547 BasicType* _saved_sig;
548 int _total_args_passed;
549 #endif
551 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
552 _fingerprint = fingerprint;
553 _i2c_entry = i2c_entry;
554 _c2i_entry = c2i_entry;
555 _c2i_unverified_entry = c2i_unverified_entry;
556 #ifdef ASSERT
557 _saved_code = NULL;
558 _code_length = 0;
559 _saved_sig = NULL;
560 _total_args_passed = 0;
561 #endif
562 }
564 void deallocate();
566 // should never be used
567 AdapterHandlerEntry();
569 public:
570 address get_i2c_entry() { return _i2c_entry; }
571 address get_c2i_entry() { return _c2i_entry; }
572 address get_c2i_unverified_entry() { return _c2i_unverified_entry; }
574 void relocate(address new_base);
576 AdapterFingerPrint* fingerprint() { return _fingerprint; }
578 AdapterHandlerEntry* next() {
579 return (AdapterHandlerEntry*)BasicHashtableEntry::next();
580 }
582 #ifdef ASSERT
583 // Used to verify that code generated for shared adapters is equivalent
584 void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
585 bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
586 #endif
588 #ifndef PRODUCT
589 void print();
590 #endif /* PRODUCT */
591 };
593 class AdapterHandlerLibrary: public AllStatic {
594 private:
595 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
596 static AdapterHandlerTable* _adapters;
597 static AdapterHandlerEntry* _abstract_method_handler;
598 static BufferBlob* buffer_blob();
599 static void initialize();
601 public:
603 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
604 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
605 static nmethod* create_native_wrapper(methodHandle method);
606 static AdapterHandlerEntry* get_adapter(methodHandle method);
608 #ifdef HAVE_DTRACE_H
609 static nmethod* create_dtrace_nmethod (methodHandle method);
610 #endif // HAVE_DTRACE_H
612 #ifndef PRODUCT
613 static void print_handler(CodeBlob* b);
614 static bool contains(CodeBlob* b);
615 static void print_statistics();
616 #endif /* PRODUCT */
618 };