1 /*
2 * Copyright (c) 1997, 2018, 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 // 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 friend class VMStructs;
49
50 private:
51 static bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
52 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
53 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
54 static methodHandle resolve_sub_helper(JavaThread *thread,
55 bool is_virtual,
56 bool is_optimized, TRAPS);
57
58 // Shared stub locations
59
60 static RuntimeStub* _wrong_method_blob;
61 static RuntimeStub* _wrong_method_abstract_blob;
62 static RuntimeStub* _ic_miss_blob;
63 static RuntimeStub* _resolve_opt_virtual_call_blob;
64 static RuntimeStub* _resolve_virtual_call_blob;
65 static RuntimeStub* _resolve_static_call_blob;
66 static address _resolve_static_call_entry;
67
68 static DeoptimizationBlob* _deopt_blob;
69
70 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
71 static SafepointBlob* _polling_page_safepoint_handler_blob;
72 static SafepointBlob* _polling_page_return_handler_blob;
73
74 #ifdef COMPILER2
75 static UncommonTrapBlob* _uncommon_trap_blob;
76 #endif // COMPILER2
77
78 #ifndef PRODUCT
79 // Counters
80 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
81 #endif // !PRODUCT
82
83 private:
84 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
85 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
86 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
87
88 public:
89 static void generate_stubs(void);
90
91 // max bytes for each dtrace string parameter
92 enum { max_dtrace_string_size = 256 };
93
94 // The following arithmetic routines are used on platforms that do
95 // not have machine instructions to implement their functionality.
96 // Do not remove these.
97
98 // long arithmetics
99 static jlong lmul(jlong y, jlong x);
100 static jlong ldiv(jlong y, jlong x);
101 static jlong lrem(jlong y, jlong x);
102
103 // float and double remainder
104 static jfloat frem(jfloat x, jfloat y);
105 static jdouble drem(jdouble x, jdouble y);
106
107
108 #ifdef _WIN64
109 // Workaround for fmod issue in the Windows x64 CRT
110 static double fmod_winx64(double x, double y);
111 #endif
112
113 #ifdef __SOFTFP__
114 static jfloat fadd(jfloat x, jfloat y);
115 static jfloat fsub(jfloat x, jfloat y);
116 static jfloat fmul(jfloat x, jfloat y);
117 static jfloat fdiv(jfloat x, jfloat y);
118
119 static jdouble dadd(jdouble x, jdouble y);
120 static jdouble dsub(jdouble x, jdouble y);
121 static jdouble dmul(jdouble x, jdouble y);
122 static jdouble ddiv(jdouble x, jdouble y);
123 #endif // __SOFTFP__
124
125 // float conversion (needs to set appropriate rounding mode)
126 static jint f2i (jfloat x);
127 static jlong f2l (jfloat x);
128 static jint d2i (jdouble x);
129 static jlong d2l (jdouble x);
130 static jfloat d2f (jdouble x);
131 static jfloat l2f (jlong x);
132 static jdouble l2d (jlong x);
133
134 #ifdef __SOFTFP__
135 static jfloat i2f (jint x);
136 static jdouble i2d (jint x);
137 static jdouble f2d (jfloat x);
138 #endif // __SOFTFP__
139
140 // double trigonometrics and transcendentals
141 static jdouble dsin(jdouble x);
142 static jdouble dcos(jdouble x);
143 static jdouble dtan(jdouble x);
144 static jdouble dlog(jdouble x);
145 static jdouble dlog10(jdouble x);
146 static jdouble dexp(jdouble x);
147 static jdouble dpow(jdouble x, jdouble y);
148
149 #if defined(__SOFTFP__) || defined(E500V2)
150 static double dabs(double f);
151 #endif
152
153 #if defined(__SOFTFP__) || defined(PPC)
154 static double dsqrt(double f);
155 #endif
156
157 // Montgomery multiplication
158 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
159 jint len, jlong inv, jint *m_ints);
160 static void montgomery_square(jint *a_ints, jint *n_ints,
161 jint len, jlong inv, jint *m_ints);
162
163 #ifdef __SOFTFP__
164 // C++ compiler generates soft float instructions as well as passing
165 // float and double in registers.
166 static int fcmpl(float x, float y);
167 static int fcmpg(float x, float y);
168 static int dcmpl(double x, double y);
169 static int dcmpg(double x, double y);
170
171 static int unordered_fcmplt(float x, float y);
172 static int unordered_dcmplt(double x, double y);
173 static int unordered_fcmple(float x, float y);
174 static int unordered_dcmple(double x, double y);
175 static int unordered_fcmpge(float x, float y);
176 static int unordered_dcmpge(double x, double y);
177 static int unordered_fcmpgt(float x, float y);
178 static int unordered_dcmpgt(double x, double y);
179
180 static float fneg(float f);
181 static double dneg(double f);
182 #endif
183
184 // exception handling across interpreter/compiler boundaries
185 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
186 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
187
188 // exception handling and implicit exceptions
189 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
190 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
191 enum ImplicitExceptionKind {
192 IMPLICIT_NULL,
193 IMPLICIT_DIVIDE_BY_ZERO,
194 STACK_OVERFLOW
195 };
196 static void throw_AbstractMethodError(JavaThread* thread);
197 static void throw_IncompatibleClassChangeError(JavaThread* thread);
198 static void throw_ArithmeticException(JavaThread* thread);
199 static void throw_NullPointerException(JavaThread* thread);
200 static void throw_NullPointerException_at_call(JavaThread* thread);
201 static void throw_StackOverflowError(JavaThread* thread);
202 static void throw_delayed_StackOverflowError(JavaThread* thread);
203 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed);
204 static address continuation_for_implicit_exception(JavaThread* thread,
205 address faulting_pc,
206 ImplicitExceptionKind exception_kind);
207 #if INCLUDE_JVMCI
208 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason);
209 #endif
210
211 // Post-slow-path-allocation, pre-initializing-stores step for
212 // implementing e.g. ReduceInitialCardMarks
213 static void on_slowpath_allocation_exit(JavaThread* thread);
214
215 static void enable_stack_reserved_zone(JavaThread* thread);
216 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
217
218 // Shared stub locations
219 static address get_poll_stub(address pc);
220
221 static address get_ic_miss_stub() {
222 assert(_ic_miss_blob!= NULL, "oops");
223 return _ic_miss_blob->entry_point();
224 }
225
226 static address get_handle_wrong_method_stub() {
227 assert(_wrong_method_blob!= NULL, "oops");
228 return _wrong_method_blob->entry_point();
229 }
230
231 static address get_handle_wrong_method_abstract_stub() {
232 assert(_wrong_method_abstract_blob!= NULL, "oops");
233 return _wrong_method_abstract_blob->entry_point();
234 }
235
236 #ifdef COMPILER2
237 static void generate_uncommon_trap_blob(void);
238 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
239 #endif // COMPILER2
240
241 static address get_resolve_opt_virtual_call_stub() {
242 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
243 return _resolve_opt_virtual_call_blob->entry_point();
244 }
245 static address get_resolve_virtual_call_stub() {
246 assert(_resolve_virtual_call_blob != NULL, "oops");
247 return _resolve_virtual_call_blob->entry_point();
248 }
249 static address get_resolve_static_call_stub() {
250 assert(_resolve_static_call_blob != NULL, "oops");
251 return _resolve_static_call_blob->entry_point();
252 }
253
254 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
255 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
256 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
257
258 // Counters
259 #ifndef PRODUCT
260 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
261 #endif // PRODUCT
262
263 // Helper routine for full-speed JVMTI exception throwing support
264 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
265 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
266
267 // RedefineClasses() tracing support for obsolete method entry
268 static int rc_trace_method_entry(JavaThread* thread, Method* m);
269
270 // To be used as the entry point for unresolved native methods.
271 static address native_method_throw_unsatisfied_link_error_entry();
272 static address native_method_throw_unsupported_operation_exception_entry();
273
274 static oop retrieve_receiver(Symbol* sig, frame caller);
275
276 static void register_finalizer(JavaThread* thread, oopDesc* obj);
277
278 // dtrace notifications
279 static int dtrace_object_alloc(oopDesc* o, int size);
280 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
281 static int dtrace_method_entry(JavaThread* thread, Method* m);
282 static int dtrace_method_exit(JavaThread* thread, Method* m);
283
284 // Utility method for retrieving the Java thread id, returns 0 if the
285 // thread is not a well formed Java thread.
286 static jlong get_java_tid(Thread* thread);
287
288
289 // used by native wrappers to reenable yellow if overflow happened in native code
290 static void reguard_yellow_pages();
291
292 // Fill in the "X cannot be cast to a Y" message for ClassCastException
293 //
294 // @param thr the current thread
295 // @param caster_klass the class of the object we are casting
296 // @return the dynamically allocated exception message (must be freed
297 // by the caller using a resource mark)
298 //
299 // BCP must refer to the current 'checkcast' opcode for the frame
300 // on top of the stack.
301 // The caller (or one of its callers) must use a ResourceMark
302 // in order to correctly free the result.
303 //
304 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
305
306 // Fill in the "X cannot be cast to a Y" message for ClassCastException
307 //
308 // @param caster_klass the class of the object we are casting
309 // @param target_klass the target klass attempt
310 // @return the dynamically allocated exception message (must be freed
311 // by the caller using a resource mark)
312 //
313 // This version does not require access the frame, so it can be called
314 // from interpreted code
315 // The caller (or one of it's callers) must use a ResourceMark
316 // in order to correctly free the result.
317 //
318 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);
319
320 // Resolves a call site- may patch in the destination of the call into the
321 // compiled code.
322 static methodHandle resolve_helper(JavaThread *thread,
323 bool is_virtual,
324 bool is_optimized, TRAPS);
325
326 private:
327 // deopt blob
328 static void generate_deopt_blob(void);
329
330 static bool handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, const frame& caller_frame,
331 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
332 bool& needs_ic_stub_refill, TRAPS);
333
334 public:
335 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
336
337 // Resets a call-site in compiled code so it will get resolved again.
338 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
339
340 // In the code prolog, if the klass comparison fails, the inline cache
341 // misses and the call site is patched to megamorphic
342 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
343
344 // Find the method that called us.
345 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
346
347
348 private:
349 static Handle find_callee_info(JavaThread* thread,
350 Bytecodes::Code& bc,
351 CallInfo& callinfo, TRAPS);
352 static Handle find_callee_info_helper(JavaThread* thread,
353 vframeStream& vfst,
354 Bytecodes::Code& bc,
355 CallInfo& callinfo, TRAPS);
356
357 static methodHandle extract_attached_method(vframeStream& vfst);
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 #if defined(X86) && defined(COMPILER1)
364 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
365 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
366 #endif // X86 && COMPILER1
367
368 public:
369
370 // Read the array of BasicTypes from a Java signature, and compute where
371 // compiled Java code would like to put the results. Values in reg_lo and
372 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
373 // registers, those above refer to 4-byte stack slots. All stack slots are
374 // based off of the window top. SharedInfo::stack0 refers to the first usable
375 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
376 // 4-bytes higher. So for sparc because the register window save area is at
377 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
378 // will be just above it. (
379 // return value is the maximum number of VMReg stack slots the convention will use.
380 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
381
382 static void check_member_name_argument_is_last_argument(const methodHandle& method,
383 const BasicType* sig_bt,
384 const VMRegPair* regs) NOT_DEBUG_RETURN;
385
386 // Ditto except for calling C
387 //
388 // C argument in register AND stack slot.
389 // Some architectures require that an argument must be passed in a register
390 // AND in a stack slot. These architectures provide a second VMRegPair array
391 // to be filled by the c_calling_convention method. On other architectures,
392 // NULL is being passed as the second VMRegPair array, so arguments are either
393 // passed in a register OR in a stack slot.
394 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
395 int total_args_passed);
396
397 static size_t trampoline_size();
398
399 static void generate_trampoline(MacroAssembler *masm, address destination);
400
401 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
402 // blobs. Unlike adapters in the tiger and earlier releases the code in these
403 // blobs does not create a new frame and are therefore virtually invisible
404 // to the stack walking code. In general these blobs extend the callers stack
405 // as needed for the conversion of argument locations.
406
407 // When calling a c2i blob the code will always call the interpreter even if
408 // by the time we reach the blob there is compiled code available. This allows
409 // the blob to pass the incoming stack pointer (the sender sp) in a known
410 // location for the interpreter to record. This is used by the frame code
411 // to correct the sender code to match up with the stack pointer when the
412 // thread left the compiled code. In addition it allows the interpreter
413 // to remove the space the c2i adapter allocated to do its argument conversion.
414
415 // Although a c2i blob will always run interpreted even if compiled code is
416 // present if we see that compiled code is present the compiled call site
417 // will be patched/re-resolved so that later calls will run compiled.
418
419 // Additionally a c2i blob need to have a unverified entry because it can be reached
420 // in situations where the call site is an inlined cache site and may go megamorphic.
421
422 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
423 // that the interpreter before it does any call dispatch will record the current
424 // stack pointer in the interpreter frame. On return it will restore the stack
425 // pointer as needed. This means the i2c adapter code doesn't need any special
426 // handshaking path with compiled code to keep the stack walking correct.
427
428 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
429 int total_args_passed,
430 int max_arg,
431 const BasicType *sig_bt,
432 const VMRegPair *regs,
433 AdapterFingerPrint* fingerprint);
434
435 static void gen_i2c_adapter(MacroAssembler *_masm,
436 int total_args_passed,
437 int comp_args_on_stack,
438 const BasicType *sig_bt,
439 const VMRegPair *regs);
440
441 // OSR support
442
443 // OSR_migration_begin will extract the jvm state from an interpreter
444 // frame (locals, monitors) and store the data in a piece of C heap
445 // storage. This then allows the interpreter frame to be removed from the
446 // stack and the OSR nmethod to be called. That method is called with a
447 // pointer to the C heap storage. This pointer is the return value from
448 // OSR_migration_begin.
449
450 static intptr_t* OSR_migration_begin(JavaThread *thread);
451
452 // OSR_migration_end is a trivial routine. It is called after the compiled
453 // method has extracted the jvm state from the C heap that OSR_migration_begin
454 // created. It's entire job is to simply free this storage.
455 static void OSR_migration_end(intptr_t* buf);
456
457 // Convert a sig into a calling convention register layout
458 // and find interesting things about it.
459 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
460 static VMReg name_for_receiver();
461
462 // "Top of Stack" slots that may be unused by the calling convention but must
463 // otherwise be preserved.
464 // On Intel these are not necessary and the value can be zero.
465 // On Sparc this describes the words reserved for storing a register window
466 // when an interrupt occurs.
467 static uint out_preserve_stack_slots();
468
469 // Is vector's size (in bytes) bigger than a size saved by default?
470 // For example, on x86 16 bytes XMM registers are saved by default.
471 static bool is_wide_vector(int size);
472
473 // Save and restore a native result
474 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
475 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
476
477 // Generate a native wrapper for a given method. The method takes arguments
478 // in the Java compiled code convention, marshals them to the native
479 // convention (handlizes oops, etc), transitions to native, makes the call,
480 // returns to java state (possibly blocking), unhandlizes any result and
481 // returns.
482 //
483 // The wrapper may contain special-case code if the given method
484 // is a JNI critical method, or a compiled method handle adapter,
485 // such as _invokeBasic, _linkToVirtual, etc.
486 static nmethod* generate_native_wrapper(MacroAssembler* masm,
487 const methodHandle& method,
488 int compile_id,
489 BasicType* sig_bt,
490 VMRegPair* regs,
491 BasicType ret_type);
492
493 // Block before entering a JNI critical method
494 static void block_for_jni_critical(JavaThread* thread);
495
496 // Pin/Unpin object
497 static oopDesc* pin_object(JavaThread* thread, oopDesc* obj);
498 static void unpin_object(JavaThread* thread, oopDesc* obj);
499
500 // A compiled caller has just called the interpreter, but compiled code
501 // exists. Patch the caller so he no longer calls into the interpreter.
502 static void fixup_callers_callsite(Method* moop, address ret_pc);
503 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
504
505 // Slow-path Locking and Unlocking
506 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
507 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
508
509 // Resolving of calls
510 static address resolve_static_call_C (JavaThread *thread);
511 static address resolve_virtual_call_C (JavaThread *thread);
512 static address resolve_opt_virtual_call_C(JavaThread *thread);
513
514 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
515 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
516 oopDesc* dest, jint dest_pos,
517 jint length, JavaThread* thread);
518
519 // handle ic miss with caller being compiled code
520 // wrong method handling (inline cache misses, zombie methods)
521 static address handle_wrong_method(JavaThread* thread);
522 static address handle_wrong_method_abstract(JavaThread* thread);
523 static address handle_wrong_method_ic_miss(JavaThread* thread);
524
525 static address handle_unsafe_access(JavaThread* thread, address next_pc);
526
527 #ifndef PRODUCT
528
529 // Collect and print inline cache miss statistics
530 private:
531 enum { maxICmiss_count = 100 };
532 static int _ICmiss_index; // length of IC miss histogram
533 static int _ICmiss_count[maxICmiss_count]; // miss counts
534 static address _ICmiss_at[maxICmiss_count]; // miss addresses
535 static void trace_ic_miss(address at);
536
537 public:
538 static int _throw_null_ctr; // throwing a null-pointer exception
539 static int _ic_miss_ctr; // total # of IC misses
540 static int _wrong_method_ctr;
541 static int _resolve_static_ctr;
542 static int _resolve_virtual_ctr;
543 static int _resolve_opt_virtual_ctr;
544 static int _implicit_null_throws;
545 static int _implicit_div0_throws;
546
547 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
548 static int _jshort_array_copy_ctr; // Slow-path short array copy
549 static int _jint_array_copy_ctr; // Slow-path int array copy
550 static int _jlong_array_copy_ctr; // Slow-path long array copy
551 static int _oop_array_copy_ctr; // Slow-path oop array copy
552 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
553 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
554 static int _generic_array_copy_ctr; // Slow-path includes type decoding
555 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
556
557 static int _new_instance_ctr; // 'new' object requires GC
558 static int _new_array_ctr; // 'new' array requires GC
559 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
560 static int _find_handler_ctr; // find exception handler
561 static int _rethrow_ctr; // rethrow exception
562 static int _mon_enter_stub_ctr; // monitor enter stub
563 static int _mon_exit_stub_ctr; // monitor exit stub
564 static int _mon_enter_ctr; // monitor enter slow
565 static int _mon_exit_ctr; // monitor exit slow
566 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
567
568 // Statistics code
569 // stats for "normal" compiled calls (non-interface)
570 static int _nof_normal_calls; // total # of calls
571 static int _nof_optimized_calls; // total # of statically-bound calls
572 static int _nof_inlined_calls; // total # of inlined normal calls
573 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
574 static int _nof_inlined_static_calls; // total # of inlined static calls
575 // stats for compiled interface calls
576 static int _nof_interface_calls; // total # of compiled calls
577 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
578 static int _nof_inlined_interface_calls; // total # of inlined interface calls
579 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
580 // stats for runtime exceptions
581 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
582
583 public: // for compiler
584 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
585 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
586 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
587 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
588 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
589 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
590 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
591 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
592 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
593 static void print_call_statistics(int comp_total);
594 static void print_statistics();
595 static void print_ic_miss_histogram();
596
597 #endif // PRODUCT
598 };
599
600
601 // ---------------------------------------------------------------------------
602 // Implementation of AdapterHandlerLibrary
603 //
604 // This library manages argument marshaling adapters and native wrappers.
605 // There are 2 flavors of adapters: I2C and C2I.
606 //
607 // The I2C flavor takes a stock interpreted call setup, marshals the
608 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
609 // code_begin(). It is broken to call it without an nmethod assigned.
610 // The usual behavior is to lift any register arguments up out of the
611 // stack and possibly re-pack the extra arguments to be contiguous.
612 // I2C adapters will save what the interpreter's stack pointer will be
613 // after arguments are popped, then adjust the interpreter's frame
614 // size to force alignment and possibly to repack the arguments.
615 // After re-packing, it jumps to the compiled code start. There are
616 // no safepoints in this adapter code and a GC cannot happen while
617 // marshaling is in progress.
618 //
619 // The C2I flavor takes a stock compiled call setup plus the target method in
620 // Rmethod, marshals the arguments for an interpreted call and jumps to
621 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
622 // setup. Compiled frames are fixed-size and the args are likely not in the
623 // right place. Hence all the args will likely be copied into the
624 // interpreter's frame, forcing that frame to grow. The compiled frame's
625 // outgoing stack args will be dead after the copy.
626 //
627 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
628 // also perform an official frame push & pop. They have a call to the native
629 // routine in their middles and end in a return (instead of ending in a jump).
630 // The native wrappers are stored in real nmethods instead of the BufferBlobs
631 // used by the adapters. The code generation happens here because it's very
632 // similar to what the adapters have to do.
633
634 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
635 friend class AdapterHandlerTable;
636
637 private:
638 AdapterFingerPrint* _fingerprint;
639 address _i2c_entry;
640 address _c2i_entry;
641 address _c2i_unverified_entry;
642
643 #ifdef ASSERT
644 // Captures code and signature used to generate this adapter when
645 // verifying adapter equivalence.
646 unsigned char* _saved_code;
647 int _saved_code_length;
648 #endif
649
650 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
651 _fingerprint = fingerprint;
652 _i2c_entry = i2c_entry;
653 _c2i_entry = c2i_entry;
654 _c2i_unverified_entry = c2i_unverified_entry;
655 #ifdef ASSERT
656 _saved_code = NULL;
657 _saved_code_length = 0;
658 #endif
659 }
660
661 void deallocate();
662
663 // should never be used
664 AdapterHandlerEntry();
665
666 public:
667 address get_i2c_entry() const { return _i2c_entry; }
668 address get_c2i_entry() const { return _c2i_entry; }
669 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
670 address base_address();
671 void relocate(address new_base);
672
673 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
674
675 AdapterHandlerEntry* next() {
676 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
677 }
678
679 #ifdef ASSERT
680 // Used to verify that code generated for shared adapters is equivalent
681 void save_code (unsigned char* code, int length);
682 bool compare_code(unsigned char* code, int length);
683 #endif
684
685 //virtual void print_on(outputStream* st) const; DO NOT USE
686 void print_adapter_on(outputStream* st) const;
687 };
688
689 // This class is used only with DumpSharedSpaces==true. It holds extra information
690 // that's used only during CDS dump time.
691 // For details, see comments around Method::link_method()
692 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
693 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region
694 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region
695
696 public:
697 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; }
698 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
699 void init() NOT_CDS_RETURN;
700 };
701
702
703 class AdapterHandlerLibrary: public AllStatic {
704 private:
705 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
706 static AdapterHandlerTable* _adapters;
707 static AdapterHandlerEntry* _abstract_method_handler;
708 static BufferBlob* buffer_blob();
709 static void initialize();
710 static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
711
712 public:
713
714 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
715 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
716 static void create_native_wrapper(const methodHandle& method);
717 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
718
719 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
720 static void print_handler_on(outputStream* st, const CodeBlob* b);
721 static bool contains(const CodeBlob* b);
722 #ifndef PRODUCT
723 static void print_statistics();
724 #endif // PRODUCT
725
726 };
727
728 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP