1 /*
2 * Copyright (c) 1997, 2016, 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 "utilities/hashtable.hpp"
34 #include "utilities/macros.hpp"
35
36 class AdapterHandlerEntry;
37 class AdapterHandlerTable;
38 class AdapterFingerPrint;
39 class vframeStream;
40
41 // Used for adapter generation. One SigEntry is used per element of
42 // the signature of the method. Value type arguments are treated
43 // specially. See comment for collect_fields().
44 class SigEntry VALUE_OBJ_CLASS_SPEC {
45 public:
46 BasicType _bt;
47 int _offset;
48
49 SigEntry()
50 : _bt(T_ILLEGAL), _offset(-1) {
51 }
52 SigEntry(BasicType bt, int offset)
53 : _bt(bt), _offset(offset) {}
54
55 SigEntry(BasicType bt)
56 : _bt(bt), _offset(-1) {}
57
58 static int compare(SigEntry* e1, SigEntry* e2) {
59 if (e1->_offset != e2->_offset) {
60 return e1->_offset - e2->_offset;
61 }
62 assert((e1->_bt == T_LONG && (e2->_bt == T_LONG || e2->_bt == T_VOID)) ||
63 (e1->_bt == T_DOUBLE && (e2->_bt == T_DOUBLE || e2->_bt == T_VOID)) ||
64 e1->_bt == T_VALUETYPE || e2->_bt == T_VALUETYPE || e1->_bt == T_VOID || e2->_bt == T_VOID, "bad bt");
65 if (e1->_bt == e2->_bt) {
66 assert(e1->_bt == T_VALUETYPE || e1->_bt == T_VOID, "only ones with duplicate offsets");
67 return 0;
68 }
69 if (e1->_bt == T_VOID ||
70 e2->_bt == T_VALUETYPE) {
71 return 1;
72 }
73 if (e1->_bt == T_VALUETYPE ||
74 e2->_bt == T_VOID) {
75 return -1;
76 }
77 ShouldNotReachHere();
78 return 0;
79 }
80 };
81
82
83 // Runtime is the base class for various runtime interfaces
84 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
85 // shared functionality such as exception forwarding (C++ to
86 // Java exceptions), locking/unlocking mechanisms, statistical
87 // information, etc.
88
89 class SharedRuntime: AllStatic {
90 friend class VMStructs;
91
92 private:
93 static methodHandle resolve_sub_helper(JavaThread *thread,
94 bool is_virtual,
95 bool is_optimized, TRAPS);
96
97 // Shared stub locations
98
99 static RuntimeStub* _wrong_method_blob;
100 static RuntimeStub* _wrong_method_abstract_blob;
101 static RuntimeStub* _ic_miss_blob;
102 static RuntimeStub* _resolve_opt_virtual_call_blob;
103 static RuntimeStub* _resolve_virtual_call_blob;
104 static RuntimeStub* _resolve_static_call_blob;
105 static address _resolve_static_call_entry;
106
107 static DeoptimizationBlob* _deopt_blob;
108
109 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
110 static SafepointBlob* _polling_page_safepoint_handler_blob;
111 static SafepointBlob* _polling_page_return_handler_blob;
112
113 #ifdef COMPILER2
114 static UncommonTrapBlob* _uncommon_trap_blob;
115 #endif // COMPILER2
116
117 #ifndef PRODUCT
118 // Counters
119 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
120 #endif // !PRODUCT
121
122 private:
123 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
124 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
125 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
126
127 public:
128 static void generate_stubs(void);
129
130 // max bytes for each dtrace string parameter
131 enum { max_dtrace_string_size = 256 };
132
133 // The following arithmetic routines are used on platforms that do
134 // not have machine instructions to implement their functionality.
135 // Do not remove these.
136
137 // long arithmetics
138 static jlong lmul(jlong y, jlong x);
139 static jlong ldiv(jlong y, jlong x);
140 static jlong lrem(jlong y, jlong x);
141
142 // float and double remainder
143 static jfloat frem(jfloat x, jfloat y);
144 static jdouble drem(jdouble x, jdouble y);
145
146
147 #ifdef _WIN64
148 // Workaround for fmod issue in the Windows x64 CRT
149 static double fmod_winx64(double x, double y);
150 #endif
151
152 #ifdef __SOFTFP__
153 static jfloat fadd(jfloat x, jfloat y);
154 static jfloat fsub(jfloat x, jfloat y);
155 static jfloat fmul(jfloat x, jfloat y);
156 static jfloat fdiv(jfloat x, jfloat y);
157
158 static jdouble dadd(jdouble x, jdouble y);
159 static jdouble dsub(jdouble x, jdouble y);
160 static jdouble dmul(jdouble x, jdouble y);
161 static jdouble ddiv(jdouble x, jdouble y);
162 #endif // __SOFTFP__
163
164 // float conversion (needs to set appropriate rounding mode)
165 static jint f2i (jfloat x);
166 static jlong f2l (jfloat x);
167 static jint d2i (jdouble x);
168 static jlong d2l (jdouble x);
169 static jfloat d2f (jdouble x);
170 static jfloat l2f (jlong x);
171 static jdouble l2d (jlong x);
172
173 #ifdef __SOFTFP__
174 static jfloat i2f (jint x);
175 static jdouble i2d (jint x);
176 static jdouble f2d (jfloat x);
177 #endif // __SOFTFP__
178
179 // double trigonometrics and transcendentals
180 static jdouble dsin(jdouble x);
181 static jdouble dcos(jdouble x);
182 static jdouble dtan(jdouble x);
183 static jdouble dlog(jdouble x);
184 static jdouble dlog10(jdouble x);
185 static jdouble dexp(jdouble x);
186 static jdouble dpow(jdouble x, jdouble y);
187
188 #if defined(__SOFTFP__) || defined(E500V2)
189 static double dabs(double f);
190 #endif
191
192 #if defined(__SOFTFP__) || defined(PPC)
193 static double dsqrt(double f);
194 #endif
195
196 // Montgomery multiplication
197 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
198 jint len, jlong inv, jint *m_ints);
199 static void montgomery_square(jint *a_ints, jint *n_ints,
200 jint len, jlong inv, jint *m_ints);
201
202 #ifdef __SOFTFP__
203 // C++ compiler generates soft float instructions as well as passing
204 // float and double in registers.
205 static int fcmpl(float x, float y);
206 static int fcmpg(float x, float y);
207 static int dcmpl(double x, double y);
208 static int dcmpg(double x, double y);
209
210 static int unordered_fcmplt(float x, float y);
211 static int unordered_dcmplt(double x, double y);
212 static int unordered_fcmple(float x, float y);
213 static int unordered_dcmple(double x, double y);
214 static int unordered_fcmpge(float x, float y);
215 static int unordered_dcmpge(double x, double y);
216 static int unordered_fcmpgt(float x, float y);
217 static int unordered_dcmpgt(double x, double y);
218
219 static float fneg(float f);
220 static double dneg(double f);
221 #endif
222
223 // exception handling across interpreter/compiler boundaries
224 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
225 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
226
227 #if INCLUDE_ALL_GCS
228 // G1 write barriers
229 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
230 static void g1_wb_post(void* card_addr, JavaThread* thread);
231 #endif // INCLUDE_ALL_GCS
232
233 // exception handling and implicit exceptions
234 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
235 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
236 enum ImplicitExceptionKind {
237 IMPLICIT_NULL,
238 IMPLICIT_DIVIDE_BY_ZERO,
239 STACK_OVERFLOW
240 };
241 static void throw_AbstractMethodError(JavaThread* thread);
242 static void throw_IncompatibleClassChangeError(JavaThread* thread);
243 static void throw_ArithmeticException(JavaThread* thread);
244 static void throw_NullPointerException(JavaThread* thread);
245 static void throw_NullPointerException_at_call(JavaThread* thread);
246 static void throw_StackOverflowError(JavaThread* thread);
247 static void throw_delayed_StackOverflowError(JavaThread* thread);
248 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed);
249 static address continuation_for_implicit_exception(JavaThread* thread,
250 address faulting_pc,
251 ImplicitExceptionKind exception_kind);
252 #if INCLUDE_JVMCI
253 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason);
254 #endif
255
256 static void enable_stack_reserved_zone(JavaThread* thread);
257 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
258
259 // Shared stub locations
260 static address get_poll_stub(address pc);
261
262 static address get_ic_miss_stub() {
263 assert(_ic_miss_blob!= NULL, "oops");
264 return _ic_miss_blob->entry_point();
265 }
266
267 static address get_handle_wrong_method_stub() {
268 assert(_wrong_method_blob!= NULL, "oops");
269 return _wrong_method_blob->entry_point();
270 }
271
272 static address get_handle_wrong_method_abstract_stub() {
273 assert(_wrong_method_abstract_blob!= NULL, "oops");
274 return _wrong_method_abstract_blob->entry_point();
275 }
276
277 #ifdef COMPILER2
278 static void generate_uncommon_trap_blob(void);
279 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
280 #endif // COMPILER2
281
282 static address get_resolve_opt_virtual_call_stub() {
283 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
284 return _resolve_opt_virtual_call_blob->entry_point();
285 }
286 static address get_resolve_virtual_call_stub() {
287 assert(_resolve_virtual_call_blob != NULL, "oops");
288 return _resolve_virtual_call_blob->entry_point();
289 }
290 static address get_resolve_static_call_stub() {
291 assert(_resolve_static_call_blob != NULL, "oops");
292 return _resolve_static_call_blob->entry_point();
293 }
294
295 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
296 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
297 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
298
299 // Counters
300 #ifndef PRODUCT
301 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
302 #endif // PRODUCT
303
304 // Helper routine for full-speed JVMTI exception throwing support
305 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
306 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
307
308 // RedefineClasses() tracing support for obsolete method entry
309 static int rc_trace_method_entry(JavaThread* thread, Method* m);
310
311 // To be used as the entry point for unresolved native methods.
312 static address native_method_throw_unsatisfied_link_error_entry();
313 static address native_method_throw_unsupported_operation_exception_entry();
314
315 static oop retrieve_receiver(Symbol* sig, frame caller);
316
317 static void register_finalizer(JavaThread* thread, oopDesc* obj);
318
319 // dtrace notifications
320 static int dtrace_object_alloc(oopDesc* o, int size);
321 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
322 static int dtrace_method_entry(JavaThread* thread, Method* m);
323 static int dtrace_method_exit(JavaThread* thread, Method* m);
324
325 // Utility method for retrieving the Java thread id, returns 0 if the
326 // thread is not a well formed Java thread.
327 static jlong get_java_tid(Thread* thread);
328
329
330 // used by native wrappers to reenable yellow if overflow happened in native code
331 static void reguard_yellow_pages();
332
333 // Fill in the "X cannot be cast to a Y" message for ClassCastException
334 //
335 // @param thr the current thread
336 // @param caster_klass the class of the object we are casting
337 // @return the dynamically allocated exception message (must be freed
338 // by the caller using a resource mark)
339 //
340 // BCP must refer to the current 'checkcast' opcode for the frame
341 // on top of the stack.
342 // The caller (or one of its callers) must use a ResourceMark
343 // in order to correctly free the result.
344 //
345 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
346
347 // Fill in the "X cannot be cast to a Y" message for ClassCastException
348 //
349 // @param caster_klass the class of the object we are casting
350 // @param target_klass the target klass attempt
351 // @return the dynamically allocated exception message (must be freed
352 // by the caller using a resource mark)
353 //
354 // This version does not require access the frame, so it can be called
355 // from interpreted code
356 // The caller (or one of it's callers) must use a ResourceMark
357 // in order to correctly free the result.
358 //
359 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass);
360
361 // Resolves a call site- may patch in the destination of the call into the
362 // compiled code.
363 static methodHandle resolve_helper(JavaThread *thread,
364 bool is_virtual,
365 bool is_optimized, TRAPS);
366
367 private:
368 // deopt blob
369 static void generate_deopt_blob(void);
370
371 public:
372 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
373
374 // Resets a call-site in compiled code so it will get resolved again.
375 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
376
377 // In the code prolog, if the klass comparison fails, the inline cache
378 // misses and the call site is patched to megamorphic
379 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
380
381 // Find the method that called us.
382 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
383
384
385 private:
386 static Handle find_callee_info(JavaThread* thread,
387 Bytecodes::Code& bc,
388 CallInfo& callinfo, TRAPS);
389 static Handle find_callee_info_helper(JavaThread* thread,
390 vframeStream& vfst,
391 Bytecodes::Code& bc,
392 CallInfo& callinfo, TRAPS);
393
394 static methodHandle extract_attached_method(vframeStream& vfst);
395
396 static address clean_virtual_call_entry();
397 static address clean_opt_virtual_call_entry();
398 static address clean_static_call_entry();
399
400 #if defined(X86) && defined(COMPILER1)
401 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
402 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, methodHandle method, Register obj_reg, Register result);
403 #endif // X86 && COMPILER1
404
405 public:
406
407 // Read the array of BasicTypes from a Java signature, and compute where
408 // compiled Java code would like to put the results. Values in reg_lo and
409 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
410 // registers, those above refer to 4-byte stack slots. All stack slots are
411 // based off of the window top. SharedInfo::stack0 refers to the first usable
412 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
413 // 4-bytes higher. So for sparc because the register window save area is at
414 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
415 // will be just above it. (
416 // return value is the maximum number of VMReg stack slots the convention will use.
417 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
418
419 static void check_member_name_argument_is_last_argument(const methodHandle& method,
420 const BasicType* sig_bt,
421 const VMRegPair* regs) NOT_DEBUG_RETURN;
422
423 // Ditto except for calling C
424 //
425 // C argument in register AND stack slot.
426 // Some architectures require that an argument must be passed in a register
427 // AND in a stack slot. These architectures provide a second VMRegPair array
428 // to be filled by the c_calling_convention method. On other architectures,
429 // NULL is being passed as the second VMRegPair array, so arguments are either
430 // passed in a register OR in a stack slot.
431 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
432 int total_args_passed);
433
434 static size_t trampoline_size();
435
436 static void generate_trampoline(MacroAssembler *masm, address destination);
437
438 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
439 // blobs. Unlike adapters in the tiger and earlier releases the code in these
440 // blobs does not create a new frame and are therefore virtually invisible
441 // to the stack walking code. In general these blobs extend the callers stack
442 // as needed for the conversion of argument locations.
443
444 // When calling a c2i blob the code will always call the interpreter even if
445 // by the time we reach the blob there is compiled code available. This allows
446 // the blob to pass the incoming stack pointer (the sender sp) in a known
447 // location for the interpreter to record. This is used by the frame code
448 // to correct the sender code to match up with the stack pointer when the
449 // thread left the compiled code. In addition it allows the interpreter
450 // to remove the space the c2i adapter allocated to do its argument conversion.
451
452 // Although a c2i blob will always run interpreted even if compiled code is
453 // present if we see that compiled code is present the compiled call site
454 // will be patched/re-resolved so that later calls will run compiled.
455
456 // Additionally a c2i blob need to have a unverified entry because it can be reached
457 // in situations where the call site is an inlined cache site and may go megamorphic.
458
459 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
460 // that the interpreter before it does any call dispatch will record the current
461 // stack pointer in the interpreter frame. On return it will restore the stack
462 // pointer as needed. This means the i2c adapter code doesn't need any special
463 // handshaking path with compiled code to keep the stack walking correct.
464
465 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm,
466 int comp_args_on_stack,
467 const GrowableArray<SigEntry>& sig_extended,
468 const VMRegPair *regs,
469 AdapterFingerPrint* fingerprint,
470 AdapterBlob*& new_adapter);
471
472 static void gen_i2c_adapter(MacroAssembler *_masm,
473 int comp_args_on_stack,
474 const GrowableArray<SigEntry>& sig_extended,
475 const VMRegPair *regs);
476
477 // OSR support
478
479 // OSR_migration_begin will extract the jvm state from an interpreter
480 // frame (locals, monitors) and store the data in a piece of C heap
481 // storage. This then allows the interpreter frame to be removed from the
482 // stack and the OSR nmethod to be called. That method is called with a
483 // pointer to the C heap storage. This pointer is the return value from
484 // OSR_migration_begin.
485
486 static intptr_t* OSR_migration_begin(JavaThread *thread);
487
488 // OSR_migration_end is a trivial routine. It is called after the compiled
489 // method has extracted the jvm state from the C heap that OSR_migration_begin
490 // created. It's entire job is to simply free this storage.
491 static void OSR_migration_end(intptr_t* buf);
492
493 // Convert a sig into a calling convention register layout
494 // and find interesting things about it.
495 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
496 static VMReg name_for_receiver();
497
498 // "Top of Stack" slots that may be unused by the calling convention but must
499 // otherwise be preserved.
500 // On Intel these are not necessary and the value can be zero.
501 // On Sparc this describes the words reserved for storing a register window
502 // when an interrupt occurs.
503 static uint out_preserve_stack_slots();
504
505 // Is vector's size (in bytes) bigger than a size saved by default?
506 // For example, on x86 16 bytes XMM registers are saved by default.
507 static bool is_wide_vector(int size);
508
509 // Save and restore a native result
510 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
511 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
512
513 // Generate a native wrapper for a given method. The method takes arguments
514 // in the Java compiled code convention, marshals them to the native
515 // convention (handlizes oops, etc), transitions to native, makes the call,
516 // returns to java state (possibly blocking), unhandlizes any result and
517 // returns.
518 //
519 // The wrapper may contain special-case code if the given method
520 // is a JNI critical method, or a compiled method handle adapter,
521 // such as _invokeBasic, _linkToVirtual, etc.
522 static nmethod* generate_native_wrapper(MacroAssembler* masm,
523 const methodHandle& method,
524 int compile_id,
525 BasicType* sig_bt,
526 VMRegPair* regs,
527 BasicType ret_type);
528
529 // Block before entering a JNI critical method
530 static void block_for_jni_critical(JavaThread* thread);
531
532 // A compiled caller has just called the interpreter, but compiled code
533 // exists. Patch the caller so he no longer calls into the interpreter.
534 static void fixup_callers_callsite(Method* moop, address ret_pc);
535 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
536
537 // Slow-path Locking and Unlocking
538 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
539 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
540
541 // Resolving of calls
542 static address resolve_static_call_C (JavaThread *thread);
543 static address resolve_virtual_call_C (JavaThread *thread);
544 static address resolve_opt_virtual_call_C(JavaThread *thread);
545
546 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
547 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
548 oopDesc* dest, jint dest_pos,
549 jint length, JavaThread* thread);
550
551 // handle ic miss with caller being compiled code
552 // wrong method handling (inline cache misses, zombie methods)
553 static address handle_wrong_method(JavaThread* thread);
554 static address handle_wrong_method_abstract(JavaThread* thread);
555 static address handle_wrong_method_ic_miss(JavaThread* thread);
556 static void allocate_value_types(JavaThread* thread, Method* callee);
557
558 static address handle_unsafe_access(JavaThread* thread, address next_pc);
559
560 #ifndef PRODUCT
561
562 // Collect and print inline cache miss statistics
563 private:
564 enum { maxICmiss_count = 100 };
565 static int _ICmiss_index; // length of IC miss histogram
566 static int _ICmiss_count[maxICmiss_count]; // miss counts
567 static address _ICmiss_at[maxICmiss_count]; // miss addresses
568 static void trace_ic_miss(address at);
569
570 public:
571 static int _throw_null_ctr; // throwing a null-pointer exception
572 static int _ic_miss_ctr; // total # of IC misses
573 static int _wrong_method_ctr;
574 static int _resolve_static_ctr;
575 static int _resolve_virtual_ctr;
576 static int _resolve_opt_virtual_ctr;
577 static int _implicit_null_throws;
578 static int _implicit_div0_throws;
579
580 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
581 static int _jshort_array_copy_ctr; // Slow-path short array copy
582 static int _jint_array_copy_ctr; // Slow-path int array copy
583 static int _jlong_array_copy_ctr; // Slow-path long array copy
584 static int _oop_array_copy_ctr; // Slow-path oop array copy
585 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
586 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
587 static int _generic_array_copy_ctr; // Slow-path includes type decoding
588 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
589
590 static int _new_instance_ctr; // 'new' object requires GC
591 static int _new_array_ctr; // 'new' array requires GC
592 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
593 static int _find_handler_ctr; // find exception handler
594 static int _rethrow_ctr; // rethrow exception
595 static int _mon_enter_stub_ctr; // monitor enter stub
596 static int _mon_exit_stub_ctr; // monitor exit stub
597 static int _mon_enter_ctr; // monitor enter slow
598 static int _mon_exit_ctr; // monitor exit slow
599 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
600
601 // Statistics code
602 // stats for "normal" compiled calls (non-interface)
603 static int _nof_normal_calls; // total # of calls
604 static int _nof_optimized_calls; // total # of statically-bound calls
605 static int _nof_inlined_calls; // total # of inlined normal calls
606 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
607 static int _nof_inlined_static_calls; // total # of inlined static calls
608 // stats for compiled interface calls
609 static int _nof_interface_calls; // total # of compiled calls
610 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
611 static int _nof_inlined_interface_calls; // total # of inlined interface calls
612 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
613 // stats for runtime exceptions
614 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
615
616 public: // for compiler
617 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
618 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
619 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
620 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
621 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
622 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
623 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
624 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
625 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
626 static void print_call_statistics(int comp_total);
627 static void print_statistics();
628 static void print_ic_miss_histogram();
629
630 #endif // PRODUCT
631 };
632
633
634 // ---------------------------------------------------------------------------
635 // Implementation of AdapterHandlerLibrary
636 //
637 // This library manages argument marshaling adapters and native wrappers.
638 // There are 2 flavors of adapters: I2C and C2I.
639 //
640 // The I2C flavor takes a stock interpreted call setup, marshals the
641 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
642 // code_begin(). It is broken to call it without an nmethod assigned.
643 // The usual behavior is to lift any register arguments up out of the
644 // stack and possibly re-pack the extra arguments to be contiguous.
645 // I2C adapters will save what the interpreter's stack pointer will be
646 // after arguments are popped, then adjust the interpreter's frame
647 // size to force alignment and possibly to repack the arguments.
648 // After re-packing, it jumps to the compiled code start. There are
649 // no safepoints in this adapter code and a GC cannot happen while
650 // marshaling is in progress.
651 //
652 // The C2I flavor takes a stock compiled call setup plus the target method in
653 // Rmethod, marshals the arguments for an interpreted call and jumps to
654 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
655 // setup. Compiled frames are fixed-size and the args are likely not in the
656 // right place. Hence all the args will likely be copied into the
657 // interpreter's frame, forcing that frame to grow. The compiled frame's
658 // outgoing stack args will be dead after the copy.
659 //
660 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
661 // also perform an official frame push & pop. They have a call to the native
662 // routine in their middles and end in a return (instead of ending in a jump).
663 // The native wrappers are stored in real nmethods instead of the BufferBlobs
664 // used by the adapters. The code generation happens here because it's very
665 // similar to what the adapters have to do.
666
667 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
668 friend class AdapterHandlerTable;
669
670 private:
671 AdapterFingerPrint* _fingerprint;
672 address _i2c_entry;
673 address _c2i_entry;
674 address _c2i_unverified_entry;
675
676 #ifdef ASSERT
677 // Captures code and signature used to generate this adapter when
678 // verifying adapter equivalence.
679 unsigned char* _saved_code;
680 int _saved_code_length;
681 #endif
682
683 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
684 _fingerprint = fingerprint;
685 _i2c_entry = i2c_entry;
686 _c2i_entry = c2i_entry;
687 _c2i_unverified_entry = c2i_unverified_entry;
688 #ifdef ASSERT
689 _saved_code = NULL;
690 _saved_code_length = 0;
691 #endif
692 }
693
694 void deallocate();
695
696 // should never be used
697 AdapterHandlerEntry();
698
699 public:
700 address get_i2c_entry() const { return _i2c_entry; }
701 address get_c2i_entry() const { return _c2i_entry; }
702 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
703 address base_address();
704 void relocate(address new_base);
705
706 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
707
708 AdapterHandlerEntry* next() {
709 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
710 }
711
712 #ifdef ASSERT
713 // Used to verify that code generated for shared adapters is equivalent
714 void save_code (unsigned char* code, int length);
715 bool compare_code(unsigned char* code, int length);
716 #endif
717
718 //virtual void print_on(outputStream* st) const; DO NOT USE
719 void print_adapter_on(outputStream* st) const;
720 };
721
722 // This class is used only with DumpSharedSpaces==true. It holds extra information
723 // that's used only during CDS dump time.
724 // For details, see comments around Method::link_method()
725 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
726 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region
727 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region
728
729 public:
730 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; }
731 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
732 void init() NOT_CDS_RETURN;
733 };
734
735
736 class AdapterHandlerLibrary: public AllStatic {
737 private:
738 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
739 static AdapterHandlerTable* _adapters;
740 static AdapterHandlerEntry* _abstract_method_handler;
741 static BufferBlob* buffer_blob();
742 static void initialize();
743 static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
744
745 public:
746
747 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
748 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
749 static void create_native_wrapper(const methodHandle& method);
750 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
751
752 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
753 static void print_handler_on(outputStream* st, const CodeBlob* b);
754 static bool contains(const CodeBlob* b);
755 #ifndef PRODUCT
756 static void print_statistics();
757 #endif // PRODUCT
758
759 };
760
761 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP