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