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 */
24
25 class AdapterHandlerEntry;
26 class AdapterHandlerTable;
27 class AdapterFingerPrint;
28 class vframeStream;
29
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.
35
36 class SharedRuntime: AllStatic {
37 private:
38 static methodHandle resolve_sub_helper(JavaThread *thread,
39 bool is_virtual,
40 bool is_optimized, TRAPS);
41
42 // Shared stub locations
43
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;
49
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
56
57 #ifndef PRODUCT
58
59 // Counters
60 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
61
62 #endif // !PRODUCT
63 public:
64
65 // max bytes for each dtrace string parameter
66 enum { max_dtrace_string_size = 256 };
67
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.
71
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);
76
77 // float and double remainder
78 static jfloat frem(jfloat x, jfloat y);
79 static jdouble drem(jdouble x, jdouble y);
80
81 #ifdef __SOFTFP__
82 static jfloat fadd(jfloat x, jfloat y);
83 static jfloat fsub(jfloat x, jfloat y);
84 static jfloat fmul(jfloat x, jfloat y);
85 static jfloat fdiv(jfloat x, jfloat y);
86
87 static jdouble dadd(jdouble x, jdouble y);
88 static jdouble dsub(jdouble x, jdouble y);
89 static jdouble dmul(jdouble x, jdouble y);
90 static jdouble ddiv(jdouble x, jdouble y);
91 #endif // __SOFTFP__
92
93 // float conversion (needs to set appropriate rounding mode)
94 static jint f2i (jfloat x);
95 static jlong f2l (jfloat x);
96 static jint d2i (jdouble x);
97 static jlong d2l (jdouble x);
98 static jfloat d2f (jdouble x);
99 static jfloat l2f (jlong x);
100 static jdouble l2d (jlong x);
101
102 #ifdef __SOFTFP__
103 static jfloat i2f (jint x);
104 static jdouble i2d (jint x);
105 static jdouble f2d (jfloat x);
106 #endif // __SOFTFP__
107
108 // double trigonometrics and transcendentals
109 static jdouble dsin(jdouble x);
110 static jdouble dcos(jdouble x);
111 static jdouble dtan(jdouble x);
112 static jdouble dlog(jdouble x);
113 static jdouble dlog10(jdouble x);
114 static jdouble dexp(jdouble x);
115 static jdouble dpow(jdouble x, jdouble y);
116
117 #if defined(__SOFTFP__) || defined(E500V2)
118 static double dabs(double f);
119 static double dsqrt(double f);
120 #endif
121
122 #ifdef __SOFTFP__
123 // C++ compiler generates soft float instructions as well as passing
124 // float and double in registers.
125 static int fcmpl(float x, float y);
126 static int fcmpg(float x, float y);
127 static int dcmpl(double x, double y);
128 static int dcmpg(double x, double y);
129
130 static int unordered_fcmplt(float x, float y);
131 static int unordered_dcmplt(double x, double y);
132 static int unordered_fcmple(float x, float y);
133 static int unordered_dcmple(double x, double y);
134 static int unordered_fcmpge(float x, float y);
135 static int unordered_dcmpge(double x, double y);
136 static int unordered_fcmpgt(float x, float y);
137 static int unordered_dcmpgt(double x, double y);
138
139 static float fneg(float f);
140 static double dneg(double f);
141 #endif
142
143 // exception handling across interpreter/compiler boundaries
144 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
145 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
146
147 #ifndef SERIALGC
148 // G1 write barriers
149 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
150 static void g1_wb_post(void* card_addr, JavaThread* thread);
151 #endif // !SERIALGC
152
153 // exception handling and implicit exceptions
154 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
155 bool force_unwind, bool top_frame_only);
156 enum ImplicitExceptionKind {
157 IMPLICIT_NULL,
158 IMPLICIT_DIVIDE_BY_ZERO,
159 STACK_OVERFLOW
160 };
161 static void throw_AbstractMethodError(JavaThread* thread);
162 static void throw_IncompatibleClassChangeError(JavaThread* thread);
163 static void throw_ArithmeticException(JavaThread* thread);
164 static void throw_NullPointerException(JavaThread* thread);
165 static void throw_NullPointerException_at_call(JavaThread* thread);
166 static void throw_StackOverflowError(JavaThread* thread);
167 static address continuation_for_implicit_exception(JavaThread* thread,
168 address faulting_pc,
169 ImplicitExceptionKind exception_kind);
170
171 // Shared stub locations
172 static address get_poll_stub(address pc);
173
174 static address get_ic_miss_stub() {
175 assert(_ic_miss_blob!= NULL, "oops");
176 return _ic_miss_blob->entry_point();
177 }
178
179 static address get_handle_wrong_method_stub() {
180 assert(_wrong_method_blob!= NULL, "oops");
181 return _wrong_method_blob->entry_point();
182 }
183
184 #ifdef COMPILER2
185 static void generate_uncommon_trap_blob(void);
186 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
187 #endif // COMPILER2
188
189 static address get_resolve_opt_virtual_call_stub(){
190 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
191 return _resolve_opt_virtual_call_blob->entry_point();
192 }
193 static address get_resolve_virtual_call_stub() {
194 assert(_resolve_virtual_call_blob != NULL, "oops");
195 return _resolve_virtual_call_blob->entry_point();
196 }
197 static address get_resolve_static_call_stub() {
198 assert(_resolve_static_call_blob != NULL, "oops");
199 return _resolve_static_call_blob->entry_point();
200 }
201
202 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
203 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
204
205 // Counters
206 #ifndef PRODUCT
207 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
208 #endif // PRODUCT
209
210 // Helper routine for full-speed JVMTI exception throwing support
211 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
212 static void throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message = NULL);
213
214 // RedefineClasses() tracing support for obsolete method entry
215 static int rc_trace_method_entry(JavaThread* thread, methodOopDesc* m);
216
217 // To be used as the entry point for unresolved native methods.
218 static address native_method_throw_unsatisfied_link_error_entry();
219
220 // bytecode tracing is only used by the TraceBytecodes
221 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
222
223 // Used to back off a spin lock that is under heavy contention
224 static void yield_all(JavaThread* thread, int attempts = 0);
225
226 static oop retrieve_receiver( symbolHandle sig, frame caller );
227
228 static void register_finalizer(JavaThread* thread, oopDesc* obj);
229
230 // dtrace notifications
231 static int dtrace_object_alloc(oopDesc* o);
232 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
233 static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m);
234 static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m);
235
236 // Utility method for retrieving the Java thread id, returns 0 if the
237 // thread is not a well formed Java thread.
238 static jlong get_java_tid(Thread* thread);
239
240
241 // used by native wrappers to reenable yellow if overflow happened in native code
242 static void reguard_yellow_pages();
243
244 /**
245 * Fill in the "X cannot be cast to a Y" message for ClassCastException
246 *
247 * @param thr the current thread
248 * @param name the name of the class of the object attempted to be cast
249 * @return the dynamically allocated exception message (must be freed
250 * by the caller using a resource mark)
251 *
252 * BCP must refer to the current 'checkcast' opcode for the frame
253 * on top of the stack.
254 * The caller (or one of it's callers) must use a ResourceMark
255 * in order to correctly free the result.
256 */
257 static char* generate_class_cast_message(JavaThread* thr, const char* name);
258
259 /**
260 * Fill in the message for a WrongMethodTypeException
261 *
262 * @param thr the current thread
263 * @param mtype (optional) expected method type (or argument class)
264 * @param mhandle (optional) actual method handle (or argument)
265 * @return the dynamically allocated exception message
266 *
267 * BCP for the frame on top of the stack must refer to an
268 * 'invokevirtual' op for a method handle, or an 'invokedyamic' op.
269 * The caller (or one of its callers) must use a ResourceMark
270 * in order to correctly free the result.
271 */
272 static char* generate_wrong_method_type_message(JavaThread* thr,
273 oopDesc* mtype = NULL,
274 oopDesc* mhandle = NULL);
275
276 /** Return non-null if the mtype is a klass or Class, not a MethodType. */
277 static oop wrong_method_type_is_for_single_argument(JavaThread* thr,
278 oopDesc* mtype);
279
280 /**
281 * Fill in the "X cannot be cast to a Y" message for ClassCastException
282 *
283 * @param name the name of the class of the object attempted to be cast
284 * @param klass the name of the target klass attempt
285 * @param gripe the specific kind of problem being reported
286 * @return the dynamically allocated exception message (must be freed
287 * by the caller using a resource mark)
288 *
289 * This version does not require access the frame, so it can be called
290 * from interpreted code
291 * The caller (or one of it's callers) must use a ResourceMark
292 * in order to correctly free the result.
293 */
294 static char* generate_class_cast_message(const char* name, const char* klass,
295 const char* gripe = " cannot be cast to ");
296
297 // Resolves a call site- may patch in the destination of the call into the
298 // compiled code.
299 static methodHandle resolve_helper(JavaThread *thread,
300 bool is_virtual,
301 bool is_optimized, TRAPS);
302
303 static void generate_stubs(void);
304
305 private:
306 // deopt blob
307 static void generate_deopt_blob(void);
308 static DeoptimizationBlob* _deopt_blob;
309
310 public:
311 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
312
313 // Resets a call-site in compiled code so it will get resolved again.
314 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
315
316 // In the code prolog, if the klass comparison fails, the inline cache
317 // misses and the call site is patched to megamorphic
318 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
319
320 // Find the method that called us.
321 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
322
323
324 private:
325 static Handle find_callee_info(JavaThread* thread,
326 Bytecodes::Code& bc,
327 CallInfo& callinfo, TRAPS);
328 static Handle find_callee_info_helper(JavaThread* thread,
329 vframeStream& vfst,
330 Bytecodes::Code& bc,
331 CallInfo& callinfo, TRAPS);
332
333 static address clean_virtual_call_entry();
334 static address clean_opt_virtual_call_entry();
335 static address clean_static_call_entry();
336
337 public:
338
339 // Read the array of BasicTypes from a Java signature, and compute where
340 // compiled Java code would like to put the results. Values in reg_lo and
341 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
342 // registers, those above refer to 4-byte stack slots. All stack slots are
343 // based off of the window top. SharedInfo::stack0 refers to the first usable
344 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
345 // 4-bytes higher. So for sparc because the register window save area is at
346 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
347 // will be just above it. (
348 // return value is the maximum number of VMReg stack slots the convention will use.
349 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing);
350
351 // Ditto except for calling C
352 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
353
354 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
355 // blobs. Unlike adapters in the tiger and earlier releases the code in these
356 // blobs does not create a new frame and are therefore virtually invisible
357 // to the stack walking code. In general these blobs extend the callers stack
358 // as needed for the conversion of argument locations.
359
360 // When calling a c2i blob the code will always call the interpreter even if
361 // by the time we reach the blob there is compiled code available. This allows
362 // the blob to pass the incoming stack pointer (the sender sp) in a known
363 // location for the interpreter to record. This is used by the frame code
364 // to correct the sender code to match up with the stack pointer when the
365 // thread left the compiled code. In addition it allows the interpreter
366 // to remove the space the c2i adapter allocated to do it argument conversion.
367
368 // Although a c2i blob will always run interpreted even if compiled code is
369 // present if we see that compiled code is present the compiled call site
370 // will be patched/re-resolved so that later calls will run compiled.
371
372 // Aditionally a c2i blob need to have a unverified entry because it can be reached
373 // in situations where the call site is an inlined cache site and may go megamorphic.
374
375 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
376 // that the interpreter before it does any call dispatch will record the current
377 // stack pointer in the interpreter frame. On return it will restore the stack
378 // pointer as needed. This means the i2c adapter code doesn't need any special
379 // handshaking path with compiled code to keep the stack walking correct.
380
381 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
382 int total_args_passed,
383 int max_arg,
384 const BasicType *sig_bt,
385 const VMRegPair *regs,
386 AdapterFingerPrint* fingerprint);
387
388 // OSR support
389
390 // OSR_migration_begin will extract the jvm state from an interpreter
391 // frame (locals, monitors) and store the data in a piece of C heap
392 // storage. This then allows the interpreter frame to be removed from the
393 // stack and the OSR nmethod to be called. That method is called with a
394 // pointer to the C heap storage. This pointer is the return value from
395 // OSR_migration_begin.
396
397 static intptr_t* OSR_migration_begin( JavaThread *thread);
398
399 // OSR_migration_end is a trivial routine. It is called after the compiled
400 // method has extracted the jvm state from the C heap that OSR_migration_begin
401 // created. It's entire job is to simply free this storage.
402 static void OSR_migration_end ( intptr_t* buf);
403
404 // Convert a sig into a calling convention register layout
405 // and find interesting things about it.
406 static VMRegPair* find_callee_arguments(symbolOop sig, bool has_receiver, int *arg_size);
407 static VMReg name_for_receiver();
408
409 // "Top of Stack" slots that may be unused by the calling convention but must
410 // otherwise be preserved.
411 // On Intel these are not necessary and the value can be zero.
412 // On Sparc this describes the words reserved for storing a register window
413 // when an interrupt occurs.
414 static uint out_preserve_stack_slots();
415
416 // Save and restore a native result
417 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
418 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
419
420 // Generate a native wrapper for a given method. The method takes arguments
421 // in the Java compiled code convention, marshals them to the native
422 // convention (handlizes oops, etc), transitions to native, makes the call,
423 // returns to java state (possibly blocking), unhandlizes any result and
424 // returns.
425 static nmethod *generate_native_wrapper(MacroAssembler* masm,
426 methodHandle method,
427 int total_args_passed,
428 int max_arg,
429 BasicType *sig_bt,
430 VMRegPair *regs,
431 BasicType ret_type );
432
433 #ifdef HAVE_DTRACE_H
434 // Generate a dtrace wrapper for a given method. The method takes arguments
435 // in the Java compiled code convention, marshals them to the native
436 // convention (handlizes oops, etc), transitions to native, makes the call,
437 // returns to java state (possibly blocking), unhandlizes any result and
438 // returns.
439 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
440 methodHandle method);
441
442 // dtrace support to convert a Java string to utf8
443 static void get_utf(oopDesc* src, address dst);
444 #endif // def HAVE_DTRACE_H
445
446 // A compiled caller has just called the interpreter, but compiled code
447 // exists. Patch the caller so he no longer calls into the interpreter.
448 static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc);
449
450 // Slow-path Locking and Unlocking
451 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
452 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
453
454 // Resolving of calls
455 static address resolve_static_call_C (JavaThread *thread);
456 static address resolve_virtual_call_C (JavaThread *thread);
457 static address resolve_opt_virtual_call_C(JavaThread *thread);
458
459 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
460 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
461 oopDesc* dest, jint dest_pos,
462 jint length, JavaThread* thread);
463
464 // handle ic miss with caller being compiled code
465 // wrong method handling (inline cache misses, zombie methods)
466 static address handle_wrong_method(JavaThread* thread);
467 static address handle_wrong_method_ic_miss(JavaThread* thread);
468
469 #ifndef PRODUCT
470
471 // Collect and print inline cache miss statistics
472 private:
473 enum { maxICmiss_count = 100 };
474 static int _ICmiss_index; // length of IC miss histogram
475 static int _ICmiss_count[maxICmiss_count]; // miss counts
476 static address _ICmiss_at[maxICmiss_count]; // miss addresses
477 static void trace_ic_miss(address at);
478
479 public:
480 static int _monitor_enter_ctr; // monitor enter slow
481 static int _monitor_exit_ctr; // monitor exit slow
482 static int _throw_null_ctr; // throwing a null-pointer exception
483 static int _ic_miss_ctr; // total # of IC misses
484 static int _wrong_method_ctr;
485 static int _resolve_static_ctr;
486 static int _resolve_virtual_ctr;
487 static int _resolve_opt_virtual_ctr;
488 static int _implicit_null_throws;
489 static int _implicit_div0_throws;
490
491 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
492 static int _jshort_array_copy_ctr; // Slow-path short array copy
493 static int _jint_array_copy_ctr; // Slow-path int array copy
494 static int _jlong_array_copy_ctr; // Slow-path long array copy
495 static int _oop_array_copy_ctr; // Slow-path oop array copy
496 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
497 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
498 static int _generic_array_copy_ctr; // Slow-path includes type decoding
499 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
500
501 static int _new_instance_ctr; // 'new' object requires GC
502 static int _new_array_ctr; // 'new' array requires GC
503 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
504 static int _find_handler_ctr; // find exception handler
505 static int _rethrow_ctr; // rethrow exception
506 static int _mon_enter_stub_ctr; // monitor enter stub
507 static int _mon_exit_stub_ctr; // monitor exit stub
508 static int _mon_enter_ctr; // monitor enter slow
509 static int _mon_exit_ctr; // monitor exit slow
510 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
511
512 // Statistics code
513 // stats for "normal" compiled calls (non-interface)
514 static int _nof_normal_calls; // total # of calls
515 static int _nof_optimized_calls; // total # of statically-bound calls
516 static int _nof_inlined_calls; // total # of inlined normal calls
517 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
518 static int _nof_inlined_static_calls; // total # of inlined static calls
519 // stats for compiled interface calls
520 static int _nof_interface_calls; // total # of compiled calls
521 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
522 static int _nof_inlined_interface_calls; // total # of inlined interface calls
523 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
524 // stats for runtime exceptions
525 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
526
527 public: // for compiler
528 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
529 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
530 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
531 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
532 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
533 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
534 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
535 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
536 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
537 static void print_call_statistics(int comp_total);
538 static void print_statistics();
539 static void print_ic_miss_histogram();
540
541 #endif // PRODUCT
542 };
543
544
545 // ---------------------------------------------------------------------------
546 // Implementation of AdapterHandlerLibrary
547 //
548 // This library manages argument marshaling adapters and native wrappers.
549 // There are 2 flavors of adapters: I2C and C2I.
550 //
551 // The I2C flavor takes a stock interpreted call setup, marshals the
552 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
553 // code_begin(). It is broken to call it without an nmethod assigned.
554 // The usual behavior is to lift any register arguments up out of the
555 // stack and possibly re-pack the extra arguments to be contigious.
556 // I2C adapters will save what the interpreter's stack pointer will be
557 // after arguments are popped, then adjust the interpreter's frame
558 // size to force alignment and possibly to repack the arguments.
559 // After re-packing, it jumps to the compiled code start. There are
560 // no safepoints in this adapter code and a GC cannot happen while
561 // marshaling is in progress.
562 //
563 // The C2I flavor takes a stock compiled call setup plus the target method in
564 // Rmethod, marshals the arguments for an interpreted call and jumps to
565 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
566 // setup. Compiled frames are fixed-size and the args are likely not in the
567 // right place. Hence all the args will likely be copied into the
568 // interpreter's frame, forcing that frame to grow. The compiled frame's
569 // outgoing stack args will be dead after the copy.
570 //
571 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
572 // also perform an offical frame push & pop. They have a call to the native
573 // routine in their middles and end in a return (instead of ending in a jump).
574 // The native wrappers are stored in real nmethods instead of the BufferBlobs
575 // used by the adapters. The code generation happens here because it's very
576 // similar to what the adapters have to do.
577
578 class AdapterHandlerEntry : public BasicHashtableEntry {
579 friend class AdapterHandlerTable;
580
581 private:
582 AdapterFingerPrint* _fingerprint;
583 address _i2c_entry;
584 address _c2i_entry;
585 address _c2i_unverified_entry;
586
587 #ifdef ASSERT
588 // Captures code and signature used to generate this adapter when
589 // verifing adapter equivalence.
590 unsigned char* _saved_code;
591 int _code_length;
592 BasicType* _saved_sig;
593 int _total_args_passed;
594 #endif
595
596 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
597 _fingerprint = fingerprint;
598 _i2c_entry = i2c_entry;
599 _c2i_entry = c2i_entry;
600 _c2i_unverified_entry = c2i_unverified_entry;
601 #ifdef ASSERT
602 _saved_code = NULL;
603 _code_length = 0;
604 _saved_sig = NULL;
605 _total_args_passed = 0;
606 #endif
607 }
608
609 void deallocate();
610
611 // should never be used
612 AdapterHandlerEntry();
613
614 public:
615 address get_i2c_entry() { return _i2c_entry; }
616 address get_c2i_entry() { return _c2i_entry; }
617 address get_c2i_unverified_entry() { return _c2i_unverified_entry; }
618
619 void relocate(address new_base);
620
621 AdapterFingerPrint* fingerprint() { return _fingerprint; }
622
623 AdapterHandlerEntry* next() {
624 return (AdapterHandlerEntry*)BasicHashtableEntry::next();
625 }
626
627 #ifdef ASSERT
628 // Used to verify that code generated for shared adapters is equivalent
629 void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
630 bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
631 #endif
632
633 void print();
634 };
635
636 class AdapterHandlerLibrary: public AllStatic {
637 private:
638 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
639 static AdapterHandlerTable* _adapters;
640 static AdapterHandlerEntry* _abstract_method_handler;
641 static BufferBlob* buffer_blob();
642 static void initialize();
643
644 public:
645
646 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
647 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
648 static nmethod* create_native_wrapper(methodHandle method);
649 static AdapterHandlerEntry* get_adapter(methodHandle method);
650
651 #ifdef HAVE_DTRACE_H
652 static nmethod* create_dtrace_nmethod (methodHandle method);
653 #endif // HAVE_DTRACE_H
654
655 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
656 static void print_handler_on(outputStream* st, CodeBlob* b);
657 static bool contains(CodeBlob* b);
658 #ifndef PRODUCT
659 static void print_statistics();
660 #endif /* PRODUCT */
661
662 };