1 /*
2 * Copyright (c) 1997, 2015, 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, "");
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
106 static DeoptimizationBlob* _deopt_blob;
107
108 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
109 static SafepointBlob* _polling_page_safepoint_handler_blob;
110 static SafepointBlob* _polling_page_return_handler_blob;
111
112 #ifdef COMPILER2
113 static UncommonTrapBlob* _uncommon_trap_blob;
114 #endif // COMPILER2
115
116 #ifndef PRODUCT
117 // Counters
118 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
119 #endif // !PRODUCT
120
121 private:
122 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
123 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
124 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
125
126 public:
127 static void generate_stubs(void);
128
129 // max bytes for each dtrace string parameter
130 enum { max_dtrace_string_size = 256 };
131
132 // The following arithmetic routines are used on platforms that do
133 // not have machine instructions to implement their functionality.
134 // Do not remove these.
135
136 // long arithmetics
137 static jlong lmul(jlong y, jlong x);
138 static jlong ldiv(jlong y, jlong x);
139 static jlong lrem(jlong y, jlong x);
140
141 // float and double remainder
142 static jfloat frem(jfloat x, jfloat y);
143 static jdouble drem(jdouble x, jdouble y);
144
145
146 #ifdef _WIN64
147 // Workaround for fmod issue in the Windows x64 CRT
148 static double fmod_winx64(double x, double y);
149 #endif
150
151 #ifdef __SOFTFP__
152 static jfloat fadd(jfloat x, jfloat y);
153 static jfloat fsub(jfloat x, jfloat y);
154 static jfloat fmul(jfloat x, jfloat y);
155 static jfloat fdiv(jfloat x, jfloat y);
156
157 static jdouble dadd(jdouble x, jdouble y);
158 static jdouble dsub(jdouble x, jdouble y);
159 static jdouble dmul(jdouble x, jdouble y);
160 static jdouble ddiv(jdouble x, jdouble y);
161 #endif // __SOFTFP__
162
163 // float conversion (needs to set appropriate rounding mode)
164 static jint f2i (jfloat x);
165 static jlong f2l (jfloat x);
166 static jint d2i (jdouble x);
167 static jlong d2l (jdouble x);
168 static jfloat d2f (jdouble x);
169 static jfloat l2f (jlong x);
170 static jdouble l2d (jlong x);
171
172 #ifdef __SOFTFP__
173 static jfloat i2f (jint x);
174 static jdouble i2d (jint x);
175 static jdouble f2d (jfloat x);
176 #endif // __SOFTFP__
177
178 // double trigonometrics and transcendentals
179 static jdouble dsin(jdouble x);
180 static jdouble dcos(jdouble x);
181 static jdouble dtan(jdouble x);
182 static jdouble dlog(jdouble x);
183 static jdouble dlog10(jdouble x);
184 static jdouble dexp(jdouble x);
185 static jdouble dpow(jdouble x, jdouble y);
186
187 #if defined(__SOFTFP__) || defined(E500V2)
188 static double dabs(double f);
189 #endif
190
191 #if defined(__SOFTFP__) || defined(PPC)
192 static double dsqrt(double f);
193 #endif
194
195 // Montgomery multiplication
196 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
197 jint len, jlong inv, jint *m_ints);
198 static void montgomery_square(jint *a_ints, jint *n_ints,
199 jint len, jlong inv, jint *m_ints);
200
201 #ifdef __SOFTFP__
202 // C++ compiler generates soft float instructions as well as passing
203 // float and double in registers.
204 static int fcmpl(float x, float y);
205 static int fcmpg(float x, float y);
206 static int dcmpl(double x, double y);
207 static int dcmpg(double x, double y);
208
209 static int unordered_fcmplt(float x, float y);
210 static int unordered_dcmplt(double x, double y);
211 static int unordered_fcmple(float x, float y);
212 static int unordered_dcmple(double x, double y);
213 static int unordered_fcmpge(float x, float y);
214 static int unordered_dcmpge(double x, double y);
215 static int unordered_fcmpgt(float x, float y);
216 static int unordered_dcmpgt(double x, double y);
217
218 static float fneg(float f);
219 static double dneg(double f);
220 #endif
221
222 // exception handling across interpreter/compiler boundaries
223 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
224 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
225
226 #if INCLUDE_ALL_GCS
227 // G1 write barriers
228 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
229 static void g1_wb_post(void* card_addr, JavaThread* thread);
230 #endif // INCLUDE_ALL_GCS
231
232 // exception handling and implicit exceptions
233 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
234 bool force_unwind, bool top_frame_only);
235 enum ImplicitExceptionKind {
236 IMPLICIT_NULL,
237 IMPLICIT_DIVIDE_BY_ZERO,
238 STACK_OVERFLOW
239 };
240 static void throw_AbstractMethodError(JavaThread* thread);
241 static void throw_IncompatibleClassChangeError(JavaThread* thread);
242 static void throw_ArithmeticException(JavaThread* thread);
243 static void throw_NullPointerException(JavaThread* thread);
244 static void throw_NullPointerException_at_call(JavaThread* thread);
245 static void throw_StackOverflowError(JavaThread* thread);
246 static void throw_delayed_StackOverflowError(JavaThread* thread);
247 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed);
248 static address continuation_for_implicit_exception(JavaThread* thread,
249 address faulting_pc,
250 ImplicitExceptionKind exception_kind);
251 #if INCLUDE_JVMCI
252 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, nmethod* nm, int deopt_reason);
253 #endif
254
255 static void enable_stack_reserved_zone(JavaThread* thread);
256 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
257
258 // Shared stub locations
259 static address get_poll_stub(address pc);
260
261 static address get_ic_miss_stub() {
262 assert(_ic_miss_blob!= NULL, "oops");
263 return _ic_miss_blob->entry_point();
264 }
265
266 static address get_handle_wrong_method_stub() {
267 assert(_wrong_method_blob!= NULL, "oops");
268 return _wrong_method_blob->entry_point();
269 }
270
271 static address get_handle_wrong_method_abstract_stub() {
272 assert(_wrong_method_abstract_blob!= NULL, "oops");
273 return _wrong_method_abstract_blob->entry_point();
274 }
275
276 #ifdef COMPILER2
277 static void generate_uncommon_trap_blob(void);
278 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
279 #endif // COMPILER2
280
281 static address get_resolve_opt_virtual_call_stub() {
282 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
283 return _resolve_opt_virtual_call_blob->entry_point();
284 }
285 static address get_resolve_virtual_call_stub() {
286 assert(_resolve_virtual_call_blob != NULL, "oops");
287 return _resolve_virtual_call_blob->entry_point();
288 }
289 static address get_resolve_static_call_stub() {
290 assert(_resolve_static_call_blob != NULL, "oops");
291 return _resolve_static_call_blob->entry_point();
292 }
293
294 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
295 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
296 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
297
298 // Counters
299 #ifndef PRODUCT
300 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
301 #endif // PRODUCT
302
303 // Helper routine for full-speed JVMTI exception throwing support
304 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
305 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
306
307 // RedefineClasses() tracing support for obsolete method entry
308 static int rc_trace_method_entry(JavaThread* thread, Method* m);
309
310 // To be used as the entry point for unresolved native methods.
311 static address native_method_throw_unsatisfied_link_error_entry();
312 static address native_method_throw_unsupported_operation_exception_entry();
313
314 // bytecode tracing is only used by the TraceBytecodes
315 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
316
317 static oop retrieve_receiver(Symbol* sig, frame caller);
318
319 static void register_finalizer(JavaThread* thread, oopDesc* obj);
320
321 // dtrace notifications
322 static int dtrace_object_alloc(oopDesc* o, int size);
323 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
324 static int dtrace_method_entry(JavaThread* thread, Method* m);
325 static int dtrace_method_exit(JavaThread* thread, Method* m);
326
327 // Utility method for retrieving the Java thread id, returns 0 if the
328 // thread is not a well formed Java thread.
329 static jlong get_java_tid(Thread* thread);
330
331
332 // used by native wrappers to reenable yellow if overflow happened in native code
333 static void reguard_yellow_pages();
334
335 // Fill in the "X cannot be cast to a Y" message for ClassCastException
336 //
337 // @param thr the current thread
338 // @param name the name of the class of the object attempted to be cast
339 // @return the dynamically allocated exception message (must be freed
340 // by the caller using a resource mark)
341 //
342 // BCP must refer to the current 'checkcast' opcode for the frame
343 // on top of the stack.
344 // The caller (or one of it's callers) must use a ResourceMark
345 // in order to correctly free the result.
346 //
347 static char* generate_class_cast_message(JavaThread* thr, const char* name);
348
349 // Fill in the "X cannot be cast to a Y" message for ClassCastException
350 //
351 // @param name the name of the class of the object attempted to be cast
352 // @param klass the name of the target klass attempt
353 // @param gripe the specific kind of problem being reported
354 // @return the dynamically allocated exception message (must be freed
355 // by the caller using a resource mark)
356 //
357 // This version does not require access the frame, so it can be called
358 // from interpreted code
359 // The caller (or one of it's callers) must use a ResourceMark
360 // in order to correctly free the result.
361 //
362 static char* generate_class_cast_message(const char* name, const char* klass,
363 const char* gripe = " cannot be cast to ");
364
365 // Resolves a call site- may patch in the destination of the call into the
366 // compiled code.
367 static methodHandle resolve_helper(JavaThread *thread,
368 bool is_virtual,
369 bool is_optimized, TRAPS);
370
371 private:
372 // deopt blob
373 static void generate_deopt_blob(void);
374
375 public:
376 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
377
378 // Resets a call-site in compiled code so it will get resolved again.
379 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
380
381 // In the code prolog, if the klass comparison fails, the inline cache
382 // misses and the call site is patched to megamorphic
383 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
384
385 // Find the method that called us.
386 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
387
388
389 private:
390 static Handle find_callee_info(JavaThread* thread,
391 Bytecodes::Code& bc,
392 CallInfo& callinfo, TRAPS);
393 static Handle find_callee_info_helper(JavaThread* thread,
394 vframeStream& vfst,
395 Bytecodes::Code& bc,
396 CallInfo& callinfo, TRAPS);
397
398 static methodHandle extract_attached_method(vframeStream& vfst);
399
400 static address clean_virtual_call_entry();
401 static address clean_opt_virtual_call_entry();
402 static address clean_static_call_entry();
403
404 #if defined(X86) && defined(COMPILER1)
405 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
406 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, methodHandle method, Register obj_reg, Register result);
407 #endif // X86 && COMPILER1
408
409 public:
410
411 // Read the array of BasicTypes from a Java signature, and compute where
412 // compiled Java code would like to put the results. Values in reg_lo and
413 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
414 // registers, those above refer to 4-byte stack slots. All stack slots are
415 // based off of the window top. SharedInfo::stack0 refers to the first usable
416 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
417 // 4-bytes higher. So for sparc because the register window save area is at
418 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
419 // will be just above it. (
420 // return value is the maximum number of VMReg stack slots the convention will use.
421 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
422
423 static void check_member_name_argument_is_last_argument(const methodHandle& method,
424 const BasicType* sig_bt,
425 const VMRegPair* regs) NOT_DEBUG_RETURN;
426
427 // Ditto except for calling C
428 //
429 // C argument in register AND stack slot.
430 // Some architectures require that an argument must be passed in a register
431 // AND in a stack slot. These architectures provide a second VMRegPair array
432 // to be filled by the c_calling_convention method. On other architectures,
433 // NULL is being passed as the second VMRegPair array, so arguments are either
434 // passed in a register OR in a stack slot.
435 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
436 int total_args_passed);
437
438 // Compute the new number of arguments in the signature if 32 bit ints
439 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
440 // is true.
441 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
442 // Adapt a method's signature if it contains 32 bit integers that must
443 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
444 // is true.
445 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
446 BasicType*& in_sig_bt, VMRegPair*& in_regs);
447
448 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
449 // blobs. Unlike adapters in the tiger and earlier releases the code in these
450 // blobs does not create a new frame and are therefore virtually invisible
451 // to the stack walking code. In general these blobs extend the callers stack
452 // as needed for the conversion of argument locations.
453
454 // When calling a c2i blob the code will always call the interpreter even if
455 // by the time we reach the blob there is compiled code available. This allows
456 // the blob to pass the incoming stack pointer (the sender sp) in a known
457 // location for the interpreter to record. This is used by the frame code
458 // to correct the sender code to match up with the stack pointer when the
459 // thread left the compiled code. In addition it allows the interpreter
460 // to remove the space the c2i adapter allocated to do its argument conversion.
461
462 // Although a c2i blob will always run interpreted even if compiled code is
463 // present if we see that compiled code is present the compiled call site
464 // will be patched/re-resolved so that later calls will run compiled.
465
466 // Additionally a c2i blob need to have a unverified entry because it can be reached
467 // in situations where the call site is an inlined cache site and may go megamorphic.
468
469 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
470 // that the interpreter before it does any call dispatch will record the current
471 // stack pointer in the interpreter frame. On return it will restore the stack
472 // pointer as needed. This means the i2c adapter code doesn't need any special
473 // handshaking path with compiled code to keep the stack walking correct.
474
475 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
476 int comp_args_on_stack,
477 const GrowableArray<SigEntry>& sig,
478 const VMRegPair *regs,
479 AdapterFingerPrint* fingerprint,
480 AdapterBlob*& new_adapter);
481
482 static void gen_i2c_adapter(MacroAssembler *_masm,
483 int comp_args_on_stack,
484 const GrowableArray<SigEntry>& sig,
485 const VMRegPair *regs);
486
487 // OSR support
488
489 // OSR_migration_begin will extract the jvm state from an interpreter
490 // frame (locals, monitors) and store the data in a piece of C heap
491 // storage. This then allows the interpreter frame to be removed from the
492 // stack and the OSR nmethod to be called. That method is called with a
493 // pointer to the C heap storage. This pointer is the return value from
494 // OSR_migration_begin.
495
496 static intptr_t* OSR_migration_begin(JavaThread *thread);
497
498 // OSR_migration_end is a trivial routine. It is called after the compiled
499 // method has extracted the jvm state from the C heap that OSR_migration_begin
500 // created. It's entire job is to simply free this storage.
501 static void OSR_migration_end(intptr_t* buf);
502
503 // Convert a sig into a calling convention register layout
504 // and find interesting things about it.
505 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
506 static VMReg name_for_receiver();
507
508 // "Top of Stack" slots that may be unused by the calling convention but must
509 // otherwise be preserved.
510 // On Intel these are not necessary and the value can be zero.
511 // On Sparc this describes the words reserved for storing a register window
512 // when an interrupt occurs.
513 static uint out_preserve_stack_slots();
514
515 // Is vector's size (in bytes) bigger than a size saved by default?
516 // For example, on x86 16 bytes XMM registers are saved by default.
517 static bool is_wide_vector(int size);
518
519 // Save and restore a native result
520 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
521 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
522
523 // Generate a native wrapper for a given method. The method takes arguments
524 // in the Java compiled code convention, marshals them to the native
525 // convention (handlizes oops, etc), transitions to native, makes the call,
526 // returns to java state (possibly blocking), unhandlizes any result and
527 // returns.
528 //
529 // The wrapper may contain special-case code if the given method
530 // is a JNI critical method, or a compiled method handle adapter,
531 // such as _invokeBasic, _linkToVirtual, etc.
532 static nmethod* generate_native_wrapper(MacroAssembler* masm,
533 const methodHandle& method,
534 int compile_id,
535 BasicType* sig_bt,
536 VMRegPair* regs,
537 BasicType ret_type);
538
539 // Block before entering a JNI critical method
540 static void block_for_jni_critical(JavaThread* thread);
541
542 // A compiled caller has just called the interpreter, but compiled code
543 // exists. Patch the caller so he no longer calls into the interpreter.
544 static void fixup_callers_callsite(Method* moop, address ret_pc);
545 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
546
547 // Slow-path Locking and Unlocking
548 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
549 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
550
551 // Resolving of calls
552 static address resolve_static_call_C (JavaThread *thread);
553 static address resolve_virtual_call_C (JavaThread *thread);
554 static address resolve_opt_virtual_call_C(JavaThread *thread);
555
556 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
557 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
558 oopDesc* dest, jint dest_pos,
559 jint length, JavaThread* thread);
560
561 // handle ic miss with caller being compiled code
562 // wrong method handling (inline cache misses, zombie methods)
563 static address handle_wrong_method(JavaThread* thread);
564 static address handle_wrong_method_abstract(JavaThread* thread);
565 static address handle_wrong_method_ic_miss(JavaThread* thread);
566 static void allocate_value_types(JavaThread* thread);
567
568 #ifndef PRODUCT
569
570 // Collect and print inline cache miss statistics
571 private:
572 enum { maxICmiss_count = 100 };
573 static int _ICmiss_index; // length of IC miss histogram
574 static int _ICmiss_count[maxICmiss_count]; // miss counts
575 static address _ICmiss_at[maxICmiss_count]; // miss addresses
576 static void trace_ic_miss(address at);
577
578 public:
579 static int _throw_null_ctr; // throwing a null-pointer exception
580 static int _ic_miss_ctr; // total # of IC misses
581 static int _wrong_method_ctr;
582 static int _resolve_static_ctr;
583 static int _resolve_virtual_ctr;
584 static int _resolve_opt_virtual_ctr;
585 static int _implicit_null_throws;
586 static int _implicit_div0_throws;
587
588 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
589 static int _jshort_array_copy_ctr; // Slow-path short array copy
590 static int _jint_array_copy_ctr; // Slow-path int array copy
591 static int _jlong_array_copy_ctr; // Slow-path long array copy
592 static int _oop_array_copy_ctr; // Slow-path oop array copy
593 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
594 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
595 static int _generic_array_copy_ctr; // Slow-path includes type decoding
596 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
597
598 static int _new_instance_ctr; // 'new' object requires GC
599 static int _new_array_ctr; // 'new' array requires GC
600 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
601 static int _find_handler_ctr; // find exception handler
602 static int _rethrow_ctr; // rethrow exception
603 static int _mon_enter_stub_ctr; // monitor enter stub
604 static int _mon_exit_stub_ctr; // monitor exit stub
605 static int _mon_enter_ctr; // monitor enter slow
606 static int _mon_exit_ctr; // monitor exit slow
607 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
608
609 // Statistics code
610 // stats for "normal" compiled calls (non-interface)
611 static int _nof_normal_calls; // total # of calls
612 static int _nof_optimized_calls; // total # of statically-bound calls
613 static int _nof_inlined_calls; // total # of inlined normal calls
614 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
615 static int _nof_inlined_static_calls; // total # of inlined static calls
616 // stats for compiled interface calls
617 static int _nof_interface_calls; // total # of compiled calls
618 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
619 static int _nof_inlined_interface_calls; // total # of inlined interface calls
620 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
621 // stats for runtime exceptions
622 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
623
624 public: // for compiler
625 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
626 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
627 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
628 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
629 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
630 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
631 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
632 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
633 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
634 static void print_call_statistics(int comp_total);
635 static void print_statistics();
636 static void print_ic_miss_histogram();
637
638 #endif // PRODUCT
639 };
640
641
642 // ---------------------------------------------------------------------------
643 // Implementation of AdapterHandlerLibrary
644 //
645 // This library manages argument marshaling adapters and native wrappers.
646 // There are 2 flavors of adapters: I2C and C2I.
647 //
648 // The I2C flavor takes a stock interpreted call setup, marshals the
649 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
650 // code_begin(). It is broken to call it without an nmethod assigned.
651 // The usual behavior is to lift any register arguments up out of the
652 // stack and possibly re-pack the extra arguments to be contiguous.
653 // I2C adapters will save what the interpreter's stack pointer will be
654 // after arguments are popped, then adjust the interpreter's frame
655 // size to force alignment and possibly to repack the arguments.
656 // After re-packing, it jumps to the compiled code start. There are
657 // no safepoints in this adapter code and a GC cannot happen while
658 // marshaling is in progress.
659 //
660 // The C2I flavor takes a stock compiled call setup plus the target method in
661 // Rmethod, marshals the arguments for an interpreted call and jumps to
662 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
663 // setup. Compiled frames are fixed-size and the args are likely not in the
664 // right place. Hence all the args will likely be copied into the
665 // interpreter's frame, forcing that frame to grow. The compiled frame's
666 // outgoing stack args will be dead after the copy.
667 //
668 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
669 // also perform an official frame push & pop. They have a call to the native
670 // routine in their middles and end in a return (instead of ending in a jump).
671 // The native wrappers are stored in real nmethods instead of the BufferBlobs
672 // used by the adapters. The code generation happens here because it's very
673 // similar to what the adapters have to do.
674
675 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
676 friend class AdapterHandlerTable;
677
678 private:
679 AdapterFingerPrint* _fingerprint;
680 address _i2c_entry;
681 address _c2i_entry;
682 address _c2i_unverified_entry;
683
684 #ifdef ASSERT
685 // Captures code and signature used to generate this adapter when
686 // verifying adapter equivalence.
687 unsigned char* _saved_code;
688 int _saved_code_length;
689 #endif
690
691 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
692 _fingerprint = fingerprint;
693 _i2c_entry = i2c_entry;
694 _c2i_entry = c2i_entry;
695 _c2i_unverified_entry = c2i_unverified_entry;
696 #ifdef ASSERT
697 _saved_code = NULL;
698 _saved_code_length = 0;
699 #endif
700 }
701
702 void deallocate();
703
704 // should never be used
705 AdapterHandlerEntry();
706
707 public:
708 address get_i2c_entry() const { return _i2c_entry; }
709 address get_c2i_entry() const { return _c2i_entry; }
710 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
711 address base_address();
712 void relocate(address new_base);
713
714 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
715
716 AdapterHandlerEntry* next() {
717 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
718 }
719
720 #ifdef ASSERT
721 // Used to verify that code generated for shared adapters is equivalent
722 void save_code (unsigned char* code, int length);
723 bool compare_code(unsigned char* code, int length);
724 #endif
725
726 //virtual void print_on(outputStream* st) const; DO NOT USE
727 void print_adapter_on(outputStream* st) const;
728 };
729
730 class AdapterHandlerLibrary: public AllStatic {
731 private:
732 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
733 static AdapterHandlerTable* _adapters;
734 static AdapterHandlerEntry* _abstract_method_handler;
735 static BufferBlob* buffer_blob();
736 static void initialize();
737
738 public:
739
740 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
741 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
742 static void create_native_wrapper(const methodHandle& method);
743 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
744
745 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
746 static void print_handler_on(outputStream* st, const CodeBlob* b);
747 static bool contains(const CodeBlob* b);
748 #ifndef PRODUCT
749 static void print_statistics();
750 #endif // PRODUCT
751
752 };
753
754 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP