1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
27
28 #include "interpreter/bytecodeHistogram.hpp"
29 #include "interpreter/bytecodeTracer.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "runtime/threadLocalStorage.hpp"
34 #include "utilities/hashtable.hpp"
35
36 class AdapterHandlerEntry;
37 class AdapterHandlerTable;
38 class AdapterFingerPrint;
39 class vframeStream;
40
41 // Runtime is the base class for various runtime interfaces
42 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
43 // shared functionality such as exception forwarding (C++ to
44 // Java exceptions), locking/unlocking mechanisms, statistical
45 // information, etc.
46
47 class SharedRuntime: AllStatic {
48 private:
49 static methodHandle resolve_sub_helper(JavaThread *thread,
50 bool is_virtual,
51 bool is_optimized, TRAPS);
52
53 // Shared stub locations
54
55 static RuntimeStub* _wrong_method_blob;
56 static RuntimeStub* _ic_miss_blob;
57 static RuntimeStub* _resolve_opt_virtual_call_blob;
58 static RuntimeStub* _resolve_virtual_call_blob;
59 static RuntimeStub* _resolve_static_call_blob;
60
61 static DeoptimizationBlob* _deopt_blob;
62 static RicochetBlob* _ricochet_blob;
63
64 static SafepointBlob* _polling_page_safepoint_handler_blob;
65 static SafepointBlob* _polling_page_return_handler_blob;
66
67 #ifdef COMPILER2
68 static UncommonTrapBlob* _uncommon_trap_blob;
69 #endif // COMPILER2
70
71 #ifndef PRODUCT
72 // Counters
73 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
74 #endif // !PRODUCT
75
76 private:
77 static SafepointBlob* generate_handler_blob(address call_ptr, bool cause_return);
78 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
79
80 public:
81 static void generate_stubs(void);
82
83 // max bytes for each dtrace string parameter
84 enum { max_dtrace_string_size = 256 };
85
86 // The following arithmetic routines are used on platforms that do
87 // not have machine instructions to implement their functionality.
88 // Do not remove these.
89
90 // long arithmetics
91 static jlong lmul(jlong y, jlong x);
92 static jlong ldiv(jlong y, jlong x);
93 static jlong lrem(jlong y, jlong x);
94
95 // float and double remainder
96 static jfloat frem(jfloat x, jfloat y);
97 static jdouble drem(jdouble x, jdouble y);
98
99 #ifdef __SOFTFP__
100 static jfloat fadd(jfloat x, jfloat y);
101 static jfloat fsub(jfloat x, jfloat y);
102 static jfloat fmul(jfloat x, jfloat y);
103 static jfloat fdiv(jfloat x, jfloat y);
104
105 static jdouble dadd(jdouble x, jdouble y);
106 static jdouble dsub(jdouble x, jdouble y);
107 static jdouble dmul(jdouble x, jdouble y);
108 static jdouble ddiv(jdouble x, jdouble y);
109 #endif // __SOFTFP__
110
111 // float conversion (needs to set appropriate rounding mode)
112 static jint f2i (jfloat x);
113 static jlong f2l (jfloat x);
114 static jint d2i (jdouble x);
115 static jlong d2l (jdouble x);
116 static jfloat d2f (jdouble x);
117 static jfloat l2f (jlong x);
118 static jdouble l2d (jlong x);
119
120 #ifdef __SOFTFP__
121 static jfloat i2f (jint x);
122 static jdouble i2d (jint x);
123 static jdouble f2d (jfloat x);
124 #endif // __SOFTFP__
125
126 // double trigonometrics and transcendentals
127 static jdouble dsin(jdouble x);
128 static jdouble dcos(jdouble x);
129 static jdouble dtan(jdouble x);
130 static jdouble dlog(jdouble x);
131 static jdouble dlog10(jdouble x);
132 static jdouble dexp(jdouble x);
133 static jdouble dpow(jdouble x, jdouble y);
134
135 #if defined(__SOFTFP__) || defined(E500V2)
136 static double dabs(double f);
137 #endif
138
139 #if defined(__SOFTFP__) || defined(PPC)
140 static double dsqrt(double f);
141 #endif
142
143 #ifdef __SOFTFP__
144 // C++ compiler generates soft float instructions as well as passing
145 // float and double in registers.
146 static int fcmpl(float x, float y);
147 static int fcmpg(float x, float y);
148 static int dcmpl(double x, double y);
149 static int dcmpg(double x, double y);
150
151 static int unordered_fcmplt(float x, float y);
152 static int unordered_dcmplt(double x, double y);
153 static int unordered_fcmple(float x, float y);
154 static int unordered_dcmple(double x, double y);
155 static int unordered_fcmpge(float x, float y);
156 static int unordered_dcmpge(double x, double y);
157 static int unordered_fcmpgt(float x, float y);
158 static int unordered_dcmpgt(double x, double y);
159
160 static float fneg(float f);
161 static double dneg(double f);
162 #endif
163
164 // exception handling across interpreter/compiler boundaries
165 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
166 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
167
168 #ifndef SERIALGC
169 // G1 write barriers
170 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
171 static void g1_wb_post(void* card_addr, JavaThread* thread);
172 #endif // !SERIALGC
173
174 // exception handling and implicit exceptions
175 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
176 bool force_unwind, bool top_frame_only);
177 enum ImplicitExceptionKind {
178 IMPLICIT_NULL,
179 IMPLICIT_DIVIDE_BY_ZERO,
180 STACK_OVERFLOW
181 };
182 static void throw_AbstractMethodError(JavaThread* thread);
183 static void throw_IncompatibleClassChangeError(JavaThread* thread);
184 static void throw_ArithmeticException(JavaThread* thread);
185 static void throw_NullPointerException(JavaThread* thread);
186 static void throw_NullPointerException_at_call(JavaThread* thread);
187 static void throw_StackOverflowError(JavaThread* thread);
188 static void throw_WrongMethodTypeException(JavaThread* thread, oopDesc* required, oopDesc* actual);
189 static address continuation_for_implicit_exception(JavaThread* thread,
190 address faulting_pc,
191 ImplicitExceptionKind exception_kind);
192
193 // Shared stub locations
194 static address get_poll_stub(address pc);
195
196 static address get_ic_miss_stub() {
197 assert(_ic_miss_blob!= NULL, "oops");
198 return _ic_miss_blob->entry_point();
199 }
200
201 static address get_handle_wrong_method_stub() {
202 assert(_wrong_method_blob!= NULL, "oops");
203 return _wrong_method_blob->entry_point();
204 }
205
206 #ifdef COMPILER2
207 static void generate_uncommon_trap_blob(void);
208 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
209 #endif // COMPILER2
210
211 static address get_resolve_opt_virtual_call_stub(){
212 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
213 return _resolve_opt_virtual_call_blob->entry_point();
214 }
215 static address get_resolve_virtual_call_stub() {
216 assert(_resolve_virtual_call_blob != NULL, "oops");
217 return _resolve_virtual_call_blob->entry_point();
218 }
219 static address get_resolve_static_call_stub() {
220 assert(_resolve_static_call_blob != NULL, "oops");
221 return _resolve_static_call_blob->entry_point();
222 }
223
224 static RicochetBlob* ricochet_blob() {
225 #ifdef X86
226 // Currently only implemented on x86
227 assert(!EnableInvokeDynamic || _ricochet_blob != NULL, "oops");
228 #endif
229 return _ricochet_blob;
230 }
231
232 static void generate_ricochet_blob();
233
234 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
235 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
236
237 // Counters
238 #ifndef PRODUCT
239 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
240 #endif // PRODUCT
241
242 // Helper routine for full-speed JVMTI exception throwing support
243 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
244 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
245
246 // RedefineClasses() tracing support for obsolete method entry
247 static int rc_trace_method_entry(JavaThread* thread, methodOopDesc* m);
248
249 // To be used as the entry point for unresolved native methods.
250 static address native_method_throw_unsatisfied_link_error_entry();
251
252 // bytecode tracing is only used by the TraceBytecodes
253 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
254
255 // Used to back off a spin lock that is under heavy contention
256 static void yield_all(JavaThread* thread, int attempts = 0);
257
258 static oop retrieve_receiver( Symbol* sig, frame caller );
259
260 static void register_finalizer(JavaThread* thread, oopDesc* obj);
261
262 // dtrace notifications
263 static int dtrace_object_alloc(oopDesc* o);
264 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
265 static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m);
266 static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m);
267
268 // Utility method for retrieving the Java thread id, returns 0 if the
269 // thread is not a well formed Java thread.
270 static jlong get_java_tid(Thread* thread);
271
272
273 // used by native wrappers to reenable yellow if overflow happened in native code
274 static void reguard_yellow_pages();
275
276 /**
277 * Fill in the "X cannot be cast to a Y" message for ClassCastException
278 *
279 * @param thr the current thread
280 * @param name the name of the class of the object attempted to be cast
281 * @return the dynamically allocated exception message (must be freed
282 * by the caller using a resource mark)
283 *
284 * BCP must refer to the current 'checkcast' opcode for the frame
285 * on top of the stack.
286 * The caller (or one of it's callers) must use a ResourceMark
287 * in order to correctly free the result.
288 */
289 static char* generate_class_cast_message(JavaThread* thr, const char* name);
290
291 /**
292 * Fill in the message for a WrongMethodTypeException
293 *
294 * @param thr the current thread
295 * @param mtype (optional) expected method type (or argument class)
296 * @param mhandle (optional) actual method handle (or argument)
297 * @return the dynamically allocated exception message
298 *
299 * BCP for the frame on top of the stack must refer to an
300 * 'invokevirtual' op for a method handle, or an 'invokedyamic' op.
301 * The caller (or one of its callers) must use a ResourceMark
302 * in order to correctly free the result.
303 */
304 static char* generate_wrong_method_type_message(JavaThread* thr,
305 oopDesc* mtype = NULL,
306 oopDesc* mhandle = NULL);
307
308 /** Return non-null if the mtype is a klass or Class, not a MethodType. */
309 static oop wrong_method_type_is_for_single_argument(JavaThread* thr,
310 oopDesc* mtype);
311
312 /**
313 * Fill in the "X cannot be cast to a Y" message for ClassCastException
314 *
315 * @param name the name of the class of the object attempted to be cast
316 * @param klass the name of the target klass attempt
317 * @param gripe the specific kind of problem being reported
318 * @return the dynamically allocated exception message (must be freed
319 * by the caller using a resource mark)
320 *
321 * This version does not require access the frame, so it can be called
322 * from interpreted code
323 * The caller (or one of it's callers) must use a ResourceMark
324 * in order to correctly free the result.
325 */
326 static char* generate_class_cast_message(const char* name, const char* klass,
327 const char* gripe = " cannot be cast to ");
328
329 // Resolves a call site- may patch in the destination of the call into the
330 // compiled code.
331 static methodHandle resolve_helper(JavaThread *thread,
332 bool is_virtual,
333 bool is_optimized, TRAPS);
334
335 private:
336 // deopt blob
337 static void generate_deopt_blob(void);
338
339 public:
340 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
341
342 // Resets a call-site in compiled code so it will get resolved again.
343 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
344
345 // In the code prolog, if the klass comparison fails, the inline cache
346 // misses and the call site is patched to megamorphic
347 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
348
349 // Find the method that called us.
350 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
351
352
353 private:
354 static Handle find_callee_info(JavaThread* thread,
355 Bytecodes::Code& bc,
356 CallInfo& callinfo, TRAPS);
357 static Handle find_callee_info_helper(JavaThread* thread,
358 vframeStream& vfst,
359 Bytecodes::Code& bc,
360 CallInfo& callinfo, TRAPS);
361
362 static address clean_virtual_call_entry();
363 static address clean_opt_virtual_call_entry();
364 static address clean_static_call_entry();
365
366 public:
367
368 // Read the array of BasicTypes from a Java signature, and compute where
369 // compiled Java code would like to put the results. Values in reg_lo and
370 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
371 // registers, those above refer to 4-byte stack slots. All stack slots are
372 // based off of the window top. SharedInfo::stack0 refers to the first usable
373 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
374 // 4-bytes higher. So for sparc because the register window save area is at
375 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
376 // will be just above it. (
377 // return value is the maximum number of VMReg stack slots the convention will use.
378 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing);
379
380 // Ditto except for calling C
381 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
382
383 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
384 // blobs. Unlike adapters in the tiger and earlier releases the code in these
385 // blobs does not create a new frame and are therefore virtually invisible
386 // to the stack walking code. In general these blobs extend the callers stack
387 // as needed for the conversion of argument locations.
388
389 // When calling a c2i blob the code will always call the interpreter even if
390 // by the time we reach the blob there is compiled code available. This allows
391 // the blob to pass the incoming stack pointer (the sender sp) in a known
392 // location for the interpreter to record. This is used by the frame code
393 // to correct the sender code to match up with the stack pointer when the
394 // thread left the compiled code. In addition it allows the interpreter
395 // to remove the space the c2i adapter allocated to do it argument conversion.
396
397 // Although a c2i blob will always run interpreted even if compiled code is
398 // present if we see that compiled code is present the compiled call site
399 // will be patched/re-resolved so that later calls will run compiled.
400
401 // Aditionally a c2i blob need to have a unverified entry because it can be reached
402 // in situations where the call site is an inlined cache site and may go megamorphic.
403
404 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
405 // that the interpreter before it does any call dispatch will record the current
406 // stack pointer in the interpreter frame. On return it will restore the stack
407 // pointer as needed. This means the i2c adapter code doesn't need any special
408 // handshaking path with compiled code to keep the stack walking correct.
409
410 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
411 int total_args_passed,
412 int max_arg,
413 const BasicType *sig_bt,
414 const VMRegPair *regs,
415 AdapterFingerPrint* fingerprint);
416
417 // OSR support
418
419 // OSR_migration_begin will extract the jvm state from an interpreter
420 // frame (locals, monitors) and store the data in a piece of C heap
421 // storage. This then allows the interpreter frame to be removed from the
422 // stack and the OSR nmethod to be called. That method is called with a
423 // pointer to the C heap storage. This pointer is the return value from
424 // OSR_migration_begin.
425
426 static intptr_t* OSR_migration_begin( JavaThread *thread);
427
428 // OSR_migration_end is a trivial routine. It is called after the compiled
429 // method has extracted the jvm state from the C heap that OSR_migration_begin
430 // created. It's entire job is to simply free this storage.
431 static void OSR_migration_end ( intptr_t* buf);
432
433 // Convert a sig into a calling convention register layout
434 // and find interesting things about it.
435 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, int *arg_size);
436 static VMReg name_for_receiver();
437
438 // "Top of Stack" slots that may be unused by the calling convention but must
439 // otherwise be preserved.
440 // On Intel these are not necessary and the value can be zero.
441 // On Sparc this describes the words reserved for storing a register window
442 // when an interrupt occurs.
443 static uint out_preserve_stack_slots();
444
445 // Save and restore a native result
446 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
447 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
448
449 // Generate a native wrapper for a given method. The method takes arguments
450 // in the Java compiled code convention, marshals them to the native
451 // convention (handlizes oops, etc), transitions to native, makes the call,
452 // returns to java state (possibly blocking), unhandlizes any result and
453 // returns.
454 static nmethod *generate_native_wrapper(MacroAssembler* masm,
455 methodHandle method,
456 int compile_id,
457 int total_args_passed,
458 int max_arg,
459 BasicType *sig_bt,
460 VMRegPair *regs,
461 BasicType ret_type );
462
463 #ifdef HAVE_DTRACE_H
464 // Generate a dtrace wrapper for a given method. The method takes arguments
465 // in the Java compiled code convention, marshals them to the native
466 // convention (handlizes oops, etc), transitions to native, makes the call,
467 // returns to java state (possibly blocking), unhandlizes any result and
468 // returns.
469 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
470 methodHandle method);
471
472 // dtrace support to convert a Java string to utf8
473 static void get_utf(oopDesc* src, address dst);
474 #endif // def HAVE_DTRACE_H
475
476 // A compiled caller has just called the interpreter, but compiled code
477 // exists. Patch the caller so he no longer calls into the interpreter.
478 static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc);
479
480 // Slow-path Locking and Unlocking
481 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
482 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
483
484 // Resolving of calls
485 static address resolve_static_call_C (JavaThread *thread);
486 static address resolve_virtual_call_C (JavaThread *thread);
487 static address resolve_opt_virtual_call_C(JavaThread *thread);
488
489 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
490 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
491 oopDesc* dest, jint dest_pos,
492 jint length, JavaThread* thread);
493
494 // handle ic miss with caller being compiled code
495 // wrong method handling (inline cache misses, zombie methods)
496 static address handle_wrong_method(JavaThread* thread);
497 static address handle_wrong_method_ic_miss(JavaThread* thread);
498
499 #ifndef PRODUCT
500
501 // Collect and print inline cache miss statistics
502 private:
503 enum { maxICmiss_count = 100 };
504 static int _ICmiss_index; // length of IC miss histogram
505 static int _ICmiss_count[maxICmiss_count]; // miss counts
506 static address _ICmiss_at[maxICmiss_count]; // miss addresses
507 static void trace_ic_miss(address at);
508
509 public:
510 static int _monitor_enter_ctr; // monitor enter slow
511 static int _monitor_exit_ctr; // monitor exit slow
512 static int _throw_null_ctr; // throwing a null-pointer exception
513 static int _ic_miss_ctr; // total # of IC misses
514 static int _wrong_method_ctr;
515 static int _resolve_static_ctr;
516 static int _resolve_virtual_ctr;
517 static int _resolve_opt_virtual_ctr;
518 static int _implicit_null_throws;
519 static int _implicit_div0_throws;
520
521 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
522 static int _jshort_array_copy_ctr; // Slow-path short array copy
523 static int _jint_array_copy_ctr; // Slow-path int array copy
524 static int _jlong_array_copy_ctr; // Slow-path long array copy
525 static int _oop_array_copy_ctr; // Slow-path oop array copy
526 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
527 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
528 static int _generic_array_copy_ctr; // Slow-path includes type decoding
529 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
530
531 static int _new_instance_ctr; // 'new' object requires GC
532 static int _new_array_ctr; // 'new' array requires GC
533 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
534 static int _find_handler_ctr; // find exception handler
535 static int _rethrow_ctr; // rethrow exception
536 static int _mon_enter_stub_ctr; // monitor enter stub
537 static int _mon_exit_stub_ctr; // monitor exit stub
538 static int _mon_enter_ctr; // monitor enter slow
539 static int _mon_exit_ctr; // monitor exit slow
540 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
541
542 // Statistics code
543 // stats for "normal" compiled calls (non-interface)
544 static int _nof_normal_calls; // total # of calls
545 static int _nof_optimized_calls; // total # of statically-bound calls
546 static int _nof_inlined_calls; // total # of inlined normal calls
547 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
548 static int _nof_inlined_static_calls; // total # of inlined static calls
549 // stats for compiled interface calls
550 static int _nof_interface_calls; // total # of compiled calls
551 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
552 static int _nof_inlined_interface_calls; // total # of inlined interface calls
553 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
554 // stats for runtime exceptions
555 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
556
557 public: // for compiler
558 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
559 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
560 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
561 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
562 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
563 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
564 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
565 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
566 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
567 static void print_call_statistics(int comp_total);
568 static void print_statistics();
569 static void print_ic_miss_histogram();
570
571 #endif // PRODUCT
572 };
573
574
575 // ---------------------------------------------------------------------------
576 // Implementation of AdapterHandlerLibrary
577 //
578 // This library manages argument marshaling adapters and native wrappers.
579 // There are 2 flavors of adapters: I2C and C2I.
580 //
581 // The I2C flavor takes a stock interpreted call setup, marshals the
582 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
583 // code_begin(). It is broken to call it without an nmethod assigned.
584 // The usual behavior is to lift any register arguments up out of the
585 // stack and possibly re-pack the extra arguments to be contigious.
586 // I2C adapters will save what the interpreter's stack pointer will be
587 // after arguments are popped, then adjust the interpreter's frame
588 // size to force alignment and possibly to repack the arguments.
589 // After re-packing, it jumps to the compiled code start. There are
590 // no safepoints in this adapter code and a GC cannot happen while
591 // marshaling is in progress.
592 //
593 // The C2I flavor takes a stock compiled call setup plus the target method in
594 // Rmethod, marshals the arguments for an interpreted call and jumps to
595 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
596 // setup. Compiled frames are fixed-size and the args are likely not in the
597 // right place. Hence all the args will likely be copied into the
598 // interpreter's frame, forcing that frame to grow. The compiled frame's
599 // outgoing stack args will be dead after the copy.
600 //
601 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
602 // also perform an offical frame push & pop. They have a call to the native
603 // routine in their middles and end in a return (instead of ending in a jump).
604 // The native wrappers are stored in real nmethods instead of the BufferBlobs
605 // used by the adapters. The code generation happens here because it's very
606 // similar to what the adapters have to do.
607
608 class AdapterHandlerEntry : public BasicHashtableEntry {
609 friend class AdapterHandlerTable;
610
611 private:
612 AdapterFingerPrint* _fingerprint;
613 address _i2c_entry;
614 address _c2i_entry;
615 address _c2i_unverified_entry;
616
617 #ifdef ASSERT
618 // Captures code and signature used to generate this adapter when
619 // verifing adapter equivalence.
620 unsigned char* _saved_code;
621 int _code_length;
622 BasicType* _saved_sig;
623 int _total_args_passed;
624 #endif
625
626 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
627 _fingerprint = fingerprint;
628 _i2c_entry = i2c_entry;
629 _c2i_entry = c2i_entry;
630 _c2i_unverified_entry = c2i_unverified_entry;
631 #ifdef ASSERT
632 _saved_code = NULL;
633 _code_length = 0;
634 _saved_sig = NULL;
635 _total_args_passed = 0;
636 #endif
637 }
638
639 void deallocate();
640
641 // should never be used
642 AdapterHandlerEntry();
643
644 public:
645 address get_i2c_entry() { return _i2c_entry; }
646 address get_c2i_entry() { return _c2i_entry; }
647 address get_c2i_unverified_entry() { return _c2i_unverified_entry; }
648
649 void relocate(address new_base);
650
651 AdapterFingerPrint* fingerprint() { return _fingerprint; }
652
653 AdapterHandlerEntry* next() {
654 return (AdapterHandlerEntry*)BasicHashtableEntry::next();
655 }
656
657 #ifdef ASSERT
658 // Used to verify that code generated for shared adapters is equivalent
659 void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
660 bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
661 #endif
662
663 void print();
664 };
665
666 class AdapterHandlerLibrary: public AllStatic {
667 private:
668 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
669 static AdapterHandlerTable* _adapters;
670 static AdapterHandlerEntry* _abstract_method_handler;
671 static BufferBlob* buffer_blob();
672 static void initialize();
673
674 public:
675
676 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
677 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
678 static nmethod* create_native_wrapper(methodHandle method, int compile_id);
679 static AdapterHandlerEntry* get_adapter(methodHandle method);
680
681 #ifdef HAVE_DTRACE_H
682 static nmethod* create_dtrace_nmethod (methodHandle method);
683 #endif // HAVE_DTRACE_H
684
685 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
686 static void print_handler_on(outputStream* st, CodeBlob* b);
687 static bool contains(CodeBlob* b);
688 #ifndef PRODUCT
689 static void print_statistics();
690 #endif /* PRODUCT */
691
692 };
693
694 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP