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 "runtime/threadLocalStorage.hpp"
34 #include "utilities/hashtable.hpp"
35 #include "utilities/macros.hpp"
36
37 class AdapterHandlerEntry;
38 class AdapterHandlerTable;
39 class AdapterFingerPrint;
40 class vframeStream;
41
42 // Runtime is the base class for various runtime interfaces
43 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
44 // shared functionality such as exception forwarding (C++ to
45 // Java exceptions), locking/unlocking mechanisms, statistical
46 // information, etc.
47
48 class SharedRuntime: AllStatic {
49 friend class VMStructs;
50
51 private:
52 static methodHandle resolve_sub_helper(JavaThread *thread,
53 bool is_virtual,
54 bool is_optimized, TRAPS);
55
56 // Shared stub locations
57
58 static RuntimeStub* _wrong_method_blob;
59 static RuntimeStub* _wrong_method_abstract_blob;
60 static RuntimeStub* _ic_miss_blob;
61 static RuntimeStub* _resolve_opt_virtual_call_blob;
62 static RuntimeStub* _resolve_virtual_call_blob;
63 static RuntimeStub* _resolve_static_call_blob;
64
65 static DeoptimizationBlob* _deopt_blob;
66
67 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
68 static SafepointBlob* _polling_page_safepoint_handler_blob;
69 static SafepointBlob* _polling_page_return_handler_blob;
70
71 #ifdef COMPILER2
72 static UncommonTrapBlob* _uncommon_trap_blob;
73 #endif // COMPILER2
74
75 #ifndef PRODUCT
76 // Counters
77 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
78 #endif // !PRODUCT
79
80 private:
81 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
82 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
83 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
84
85 public:
86 static void generate_stubs(void);
87
88 // max bytes for each dtrace string parameter
89 enum { max_dtrace_string_size = 256 };
90
91 // The following arithmetic routines are used on platforms that do
92 // not have machine instructions to implement their functionality.
93 // Do not remove these.
94
95 // long arithmetics
96 static jlong lmul(jlong y, jlong x);
97 static jlong ldiv(jlong y, jlong x);
98 static jlong lrem(jlong y, jlong x);
99
100 // float and double remainder
101 static jfloat frem(jfloat x, jfloat y);
102 static jdouble drem(jdouble x, jdouble y);
103
104 #ifdef __SOFTFP__
105 static jfloat fadd(jfloat x, jfloat y);
106 static jfloat fsub(jfloat x, jfloat y);
107 static jfloat fmul(jfloat x, jfloat y);
108 static jfloat fdiv(jfloat x, jfloat y);
109
110 static jdouble dadd(jdouble x, jdouble y);
111 static jdouble dsub(jdouble x, jdouble y);
112 static jdouble dmul(jdouble x, jdouble y);
113 static jdouble ddiv(jdouble x, jdouble y);
114 #endif // __SOFTFP__
115
116 // float conversion (needs to set appropriate rounding mode)
117 static jint f2i (jfloat x);
118 static jlong f2l (jfloat x);
119 static jint d2i (jdouble x);
120 static jlong d2l (jdouble x);
121 static jfloat d2f (jdouble x);
122 static jfloat l2f (jlong x);
123 static jdouble l2d (jlong x);
124
125 #ifdef __SOFTFP__
126 static jfloat i2f (jint x);
127 static jdouble i2d (jint x);
128 static jdouble f2d (jfloat x);
129 #endif // __SOFTFP__
130
131 // double trigonometrics and transcendentals
132 static jdouble dsin(jdouble x);
133 static jdouble dcos(jdouble x);
134 static jdouble dtan(jdouble x);
135 static jdouble dlog(jdouble x);
136 static jdouble dlog10(jdouble x);
137 static jdouble dexp(jdouble x);
138 static jdouble dpow(jdouble x, jdouble y);
139
140 #if defined(__SOFTFP__) || defined(E500V2)
141 static double dabs(double f);
142 #endif
143
144 #if defined(__SOFTFP__) || defined(PPC32)
145 static double dsqrt(double f);
146 #endif
147
148 // Montgomery multiplication
149 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
150 jint len, jlong inv, jint *m_ints);
151 static void montgomery_square(jint *a_ints, jint *n_ints,
152 jint len, jlong inv, jint *m_ints);
153
154 #ifdef __SOFTFP__
155 // C++ compiler generates soft float instructions as well as passing
156 // float and double in registers.
157 static int fcmpl(float x, float y);
158 static int fcmpg(float x, float y);
159 static int dcmpl(double x, double y);
160 static int dcmpg(double x, double y);
161
162 static int unordered_fcmplt(float x, float y);
163 static int unordered_dcmplt(double x, double y);
164 static int unordered_fcmple(float x, float y);
165 static int unordered_dcmple(double x, double y);
166 static int unordered_fcmpge(float x, float y);
167 static int unordered_dcmpge(double x, double y);
168 static int unordered_fcmpgt(float x, float y);
169 static int unordered_dcmpgt(double x, double y);
170
171 static float fneg(float f);
172 static double dneg(double f);
173 #endif
174
175 // exception handling across interpreter/compiler boundaries
176 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
177 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
178
179 #if INCLUDE_ALL_GCS
180 // G1 write barriers
181 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
182 static void g1_wb_post(void* card_addr, JavaThread* thread);
183 #endif // INCLUDE_ALL_GCS
184
185 // exception handling and implicit exceptions
186 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
187 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
188 enum ImplicitExceptionKind {
189 IMPLICIT_NULL,
190 IMPLICIT_DIVIDE_BY_ZERO,
191 STACK_OVERFLOW
192 };
193 static void throw_AbstractMethodError(JavaThread* thread);
194 static void throw_IncompatibleClassChangeError(JavaThread* thread);
195 static void throw_ArithmeticException(JavaThread* thread);
196 static void throw_NullPointerException(JavaThread* thread);
197 static void throw_NullPointerException_at_call(JavaThread* thread);
198 static void throw_StackOverflowError(JavaThread* thread);
199 static address continuation_for_implicit_exception(JavaThread* thread,
200 address faulting_pc,
201 ImplicitExceptionKind exception_kind);
202
203 // Shared stub locations
204 static address get_poll_stub(address pc);
205
206 static address get_ic_miss_stub() {
207 assert(_ic_miss_blob!= NULL, "oops");
208 return _ic_miss_blob->entry_point();
209 }
210
211 static address get_handle_wrong_method_stub() {
212 assert(_wrong_method_blob!= NULL, "oops");
213 return _wrong_method_blob->entry_point();
214 }
215
216 static address get_handle_wrong_method_abstract_stub() {
217 assert(_wrong_method_abstract_blob!= NULL, "oops");
218 return _wrong_method_abstract_blob->entry_point();
219 }
220
221 #ifdef COMPILER2
222 static void generate_uncommon_trap_blob(void);
223 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
224 #endif // COMPILER2
225
226 static address get_resolve_opt_virtual_call_stub(){
227 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
228 return _resolve_opt_virtual_call_blob->entry_point();
229 }
230 static address get_resolve_virtual_call_stub() {
231 assert(_resolve_virtual_call_blob != NULL, "oops");
232 return _resolve_virtual_call_blob->entry_point();
233 }
234 static address get_resolve_static_call_stub() {
235 assert(_resolve_static_call_blob != NULL, "oops");
236 return _resolve_static_call_blob->entry_point();
237 }
238
239 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
240 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
241 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
242
243 // Counters
244 #ifndef PRODUCT
245 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
246 #endif // PRODUCT
247
248 // Helper routine for full-speed JVMTI exception throwing support
249 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
250 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
251
252 // RedefineClasses() tracing support for obsolete method entry
253 static int rc_trace_method_entry(JavaThread* thread, Method* m);
254
255 // To be used as the entry point for unresolved native methods.
256 static address native_method_throw_unsatisfied_link_error_entry();
257 static address native_method_throw_unsupported_operation_exception_entry();
258
259 // bytecode tracing is only used by the TraceBytecodes
260 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
261
262 // Used to back off a spin lock that is under heavy contention
263 static void yield_all(JavaThread* thread, int attempts = 0);
264
265 static oop retrieve_receiver( Symbol* sig, frame caller );
266
267 static void register_finalizer(JavaThread* thread, oopDesc* obj);
268
269 // dtrace notifications
270 static int dtrace_object_alloc(oopDesc* o, int size);
271 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
272 static int dtrace_method_entry(JavaThread* thread, Method* m);
273 static int dtrace_method_exit(JavaThread* thread, Method* m);
274
275 // Utility method for retrieving the Java thread id, returns 0 if the
276 // thread is not a well formed Java thread.
277 static jlong get_java_tid(Thread* thread);
278
279
280 // used by native wrappers to reenable yellow if overflow happened in native code
281 static void reguard_yellow_pages();
282
283 /**
284 * Fill in the "X cannot be cast to a Y" message for ClassCastException
285 *
286 * @param thr the current thread
287 * @param name the name of the class of the object attempted to be cast
288 * @return the dynamically allocated exception message (must be freed
289 * by the caller using a resource mark)
290 *
291 * BCP must refer to the current 'checkcast' opcode for the frame
292 * on top of the stack.
293 * The caller (or one of it's callers) must use a ResourceMark
294 * in order to correctly free the result.
295 */
296 static char* generate_class_cast_message(JavaThread* thr, const char* name);
297
298 /**
299 * Fill in the "X cannot be cast to a Y" message for ClassCastException
300 *
301 * @param name the name of the class of the object attempted to be cast
302 * @param klass the name of the target klass attempt
303 * @param gripe the specific kind of problem being reported
304 * @return the dynamically allocated exception message (must be freed
305 * by the caller using a resource mark)
306 *
307 * This version does not require access the frame, so it can be called
308 * from interpreted code
309 * The caller (or one of it's callers) must use a ResourceMark
310 * in order to correctly free the result.
311 */
312 static char* generate_class_cast_message(const char* name, const char* klass,
313 const char* gripe = " cannot be cast to ");
314
315 // Resolves a call site- may patch in the destination of the call into the
316 // compiled code.
317 static methodHandle resolve_helper(JavaThread *thread,
318 bool is_virtual,
319 bool is_optimized, TRAPS);
320
321 private:
322 // deopt blob
323 static void generate_deopt_blob(void);
324
325 public:
326 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
327
328 // Resets a call-site in compiled code so it will get resolved again.
329 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
330
331 // In the code prolog, if the klass comparison fails, the inline cache
332 // misses and the call site is patched to megamorphic
333 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
334
335 // Find the method that called us.
336 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
337
338
339 private:
340 static Handle find_callee_info(JavaThread* thread,
341 Bytecodes::Code& bc,
342 CallInfo& callinfo, TRAPS);
343 static Handle find_callee_info_helper(JavaThread* thread,
344 vframeStream& vfst,
345 Bytecodes::Code& bc,
346 CallInfo& callinfo, TRAPS);
347
348 static address clean_virtual_call_entry();
349 static address clean_opt_virtual_call_entry();
350 static address clean_static_call_entry();
351
352 public:
353
354 // Read the array of BasicTypes from a Java signature, and compute where
355 // compiled Java code would like to put the results. Values in reg_lo and
356 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
357 // registers, those above refer to 4-byte stack slots. All stack slots are
358 // based off of the window top. SharedInfo::stack0 refers to the first usable
359 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
360 // 4-bytes higher. So for sparc because the register window save area is at
361 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
362 // will be just above it. (
363 // return value is the maximum number of VMReg stack slots the convention will use.
364 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
365
366 static void check_member_name_argument_is_last_argument(methodHandle method,
367 const BasicType* sig_bt,
368 const VMRegPair* regs) NOT_DEBUG_RETURN;
369
370 // Ditto except for calling C
371 //
372 // C argument in register AND stack slot.
373 // Some architectures require that an argument must be passed in a register
374 // AND in a stack slot. These architectures provide a second VMRegPair array
375 // to be filled by the c_calling_convention method. On other architectures,
376 // NULL is being passed as the second VMRegPair array, so arguments are either
377 // passed in a register OR in a stack slot.
378 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
379 int total_args_passed);
380
381 // Compute the new number of arguments in the signature if 32 bit ints
382 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
383 // is true.
384 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
385 // Adapt a method's signature if it contains 32 bit integers that must
386 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
387 // is true.
388 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
389 BasicType*& in_sig_bt, VMRegPair*& in_regs);
390
391 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
392 // blobs. Unlike adapters in the tiger and earlier releases the code in these
393 // blobs does not create a new frame and are therefore virtually invisible
394 // to the stack walking code. In general these blobs extend the callers stack
395 // as needed for the conversion of argument locations.
396
397 // When calling a c2i blob the code will always call the interpreter even if
398 // by the time we reach the blob there is compiled code available. This allows
399 // the blob to pass the incoming stack pointer (the sender sp) in a known
400 // location for the interpreter to record. This is used by the frame code
401 // to correct the sender code to match up with the stack pointer when the
402 // thread left the compiled code. In addition it allows the interpreter
403 // to remove the space the c2i adapter allocated to do its argument conversion.
404
405 // Although a c2i blob will always run interpreted even if compiled code is
406 // present if we see that compiled code is present the compiled call site
407 // will be patched/re-resolved so that later calls will run compiled.
408
409 // Aditionally a c2i blob need to have a unverified entry because it can be reached
410 // in situations where the call site is an inlined cache site and may go megamorphic.
411
412 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
413 // that the interpreter before it does any call dispatch will record the current
414 // stack pointer in the interpreter frame. On return it will restore the stack
415 // pointer as needed. This means the i2c adapter code doesn't need any special
416 // handshaking path with compiled code to keep the stack walking correct.
417
418 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
419 int total_args_passed,
420 int max_arg,
421 const BasicType *sig_bt,
422 const VMRegPair *regs,
423 AdapterFingerPrint* fingerprint);
424
425 // OSR support
426
427 // OSR_migration_begin will extract the jvm state from an interpreter
428 // frame (locals, monitors) and store the data in a piece of C heap
429 // storage. This then allows the interpreter frame to be removed from the
430 // stack and the OSR nmethod to be called. That method is called with a
431 // pointer to the C heap storage. This pointer is the return value from
432 // OSR_migration_begin.
433
434 static intptr_t* OSR_migration_begin( JavaThread *thread);
435
436 // OSR_migration_end is a trivial routine. It is called after the compiled
437 // method has extracted the jvm state from the C heap that OSR_migration_begin
438 // created. It's entire job is to simply free this storage.
439 static void OSR_migration_end ( intptr_t* buf);
440
441 // Convert a sig into a calling convention register layout
442 // and find interesting things about it.
443 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
444 static VMReg name_for_receiver();
445
446 // "Top of Stack" slots that may be unused by the calling convention but must
447 // otherwise be preserved.
448 // On Intel these are not necessary and the value can be zero.
449 // On Sparc this describes the words reserved for storing a register window
450 // when an interrupt occurs.
451 static uint out_preserve_stack_slots();
452
453 // Is vector's size (in bytes) bigger than a size saved by default?
454 // For example, on x86 16 bytes XMM registers are saved by default.
455 static bool is_wide_vector(int size);
456
457 // Save and restore a native result
458 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
459 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
460
461 // Generate a native wrapper for a given method. The method takes arguments
462 // in the Java compiled code convention, marshals them to the native
463 // convention (handlizes oops, etc), transitions to native, makes the call,
464 // returns to java state (possibly blocking), unhandlizes any result and
465 // returns.
466 //
467 // The wrapper may contain special-case code if the given method
468 // is a JNI critical method, or a compiled method handle adapter,
469 // such as _invokeBasic, _linkToVirtual, etc.
470 static nmethod* generate_native_wrapper(MacroAssembler* masm,
471 methodHandle method,
472 int compile_id,
473 BasicType* sig_bt,
474 VMRegPair* regs,
475 BasicType ret_type );
476
477 // Block before entering a JNI critical method
478 static void block_for_jni_critical(JavaThread* thread);
479
480 #ifdef HAVE_DTRACE_H
481 // Generate a dtrace wrapper for a given method. The method takes arguments
482 // in the Java compiled code convention, marshals them to the native
483 // convention (handlizes oops, etc), transitions to native, makes the call,
484 // returns to java state (possibly blocking), unhandlizes any result and
485 // returns.
486 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
487 methodHandle method);
488
489 // dtrace support to convert a Java string to utf8
490 static void get_utf(oopDesc* src, address dst);
491 #endif // def HAVE_DTRACE_H
492
493 // Pin/Unpin object
494 static oopDesc* pin_object(JavaThread* thread, oopDesc* obj);
495 static void unpin_object(JavaThread* thread, oopDesc* obj);
496
497 // A compiled caller has just called the interpreter, but compiled code
498 // exists. Patch the caller so he no longer calls into the interpreter.
499 static void fixup_callers_callsite(Method* moop, address ret_pc);
500
501 // Slow-path Locking and Unlocking
502 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
503 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
504
505 // Resolving of calls
506 static address resolve_static_call_C (JavaThread *thread);
507 static address resolve_virtual_call_C (JavaThread *thread);
508 static address resolve_opt_virtual_call_C(JavaThread *thread);
509
510 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
511 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
512 oopDesc* dest, jint dest_pos,
513 jint length, JavaThread* thread);
514
515 // handle ic miss with caller being compiled code
516 // wrong method handling (inline cache misses, zombie methods)
517 static address handle_wrong_method(JavaThread* thread);
518 static address handle_wrong_method_abstract(JavaThread* thread);
519 static address handle_wrong_method_ic_miss(JavaThread* thread);
520
521 #ifndef PRODUCT
522
523 // Collect and print inline cache miss statistics
524 private:
525 enum { maxICmiss_count = 100 };
526 static int _ICmiss_index; // length of IC miss histogram
527 static int _ICmiss_count[maxICmiss_count]; // miss counts
528 static address _ICmiss_at[maxICmiss_count]; // miss addresses
529 static void trace_ic_miss(address at);
530
531 public:
532 static int _monitor_enter_ctr; // monitor enter slow
533 static int _monitor_exit_ctr; // monitor exit slow
534 static int _throw_null_ctr; // throwing a null-pointer exception
535 static int _ic_miss_ctr; // total # of IC misses
536 static int _wrong_method_ctr;
537 static int _resolve_static_ctr;
538 static int _resolve_virtual_ctr;
539 static int _resolve_opt_virtual_ctr;
540 static int _implicit_null_throws;
541 static int _implicit_div0_throws;
542
543 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
544 static int _jshort_array_copy_ctr; // Slow-path short array copy
545 static int _jint_array_copy_ctr; // Slow-path int array copy
546 static int _jlong_array_copy_ctr; // Slow-path long array copy
547 static int _oop_array_copy_ctr; // Slow-path oop array copy
548 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
549 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
550 static int _generic_array_copy_ctr; // Slow-path includes type decoding
551 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
552
553 static int _new_instance_ctr; // 'new' object requires GC
554 static int _new_array_ctr; // 'new' array requires GC
555 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
556 static int _find_handler_ctr; // find exception handler
557 static int _rethrow_ctr; // rethrow exception
558 static int _mon_enter_stub_ctr; // monitor enter stub
559 static int _mon_exit_stub_ctr; // monitor exit stub
560 static int _mon_enter_ctr; // monitor enter slow
561 static int _mon_exit_ctr; // monitor exit slow
562 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
563
564 // Statistics code
565 // stats for "normal" compiled calls (non-interface)
566 static int _nof_normal_calls; // total # of calls
567 static int _nof_optimized_calls; // total # of statically-bound calls
568 static int _nof_inlined_calls; // total # of inlined normal calls
569 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
570 static int _nof_inlined_static_calls; // total # of inlined static calls
571 // stats for compiled interface calls
572 static int _nof_interface_calls; // total # of compiled calls
573 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
574 static int _nof_inlined_interface_calls; // total # of inlined interface calls
575 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
576 // stats for runtime exceptions
577 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
578
579 public: // for compiler
580 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
581 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
582 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
583 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
584 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
585 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
586 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
587 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
588 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
589 static void print_call_statistics(int comp_total);
590 static void print_statistics();
591 static void print_ic_miss_histogram();
592
593 #endif // PRODUCT
594 };
595
596
597 // ---------------------------------------------------------------------------
598 // Implementation of AdapterHandlerLibrary
599 //
600 // This library manages argument marshaling adapters and native wrappers.
601 // There are 2 flavors of adapters: I2C and C2I.
602 //
603 // The I2C flavor takes a stock interpreted call setup, marshals the
604 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
605 // code_begin(). It is broken to call it without an nmethod assigned.
606 // The usual behavior is to lift any register arguments up out of the
607 // stack and possibly re-pack the extra arguments to be contigious.
608 // I2C adapters will save what the interpreter's stack pointer will be
609 // after arguments are popped, then adjust the interpreter's frame
610 // size to force alignment and possibly to repack the arguments.
611 // After re-packing, it jumps to the compiled code start. There are
612 // no safepoints in this adapter code and a GC cannot happen while
613 // marshaling is in progress.
614 //
615 // The C2I flavor takes a stock compiled call setup plus the target method in
616 // Rmethod, marshals the arguments for an interpreted call and jumps to
617 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
618 // setup. Compiled frames are fixed-size and the args are likely not in the
619 // right place. Hence all the args will likely be copied into the
620 // interpreter's frame, forcing that frame to grow. The compiled frame's
621 // outgoing stack args will be dead after the copy.
622 //
623 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
624 // also perform an offical frame push & pop. They have a call to the native
625 // routine in their middles and end in a return (instead of ending in a jump).
626 // The native wrappers are stored in real nmethods instead of the BufferBlobs
627 // used by the adapters. The code generation happens here because it's very
628 // similar to what the adapters have to do.
629
630 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
631 friend class AdapterHandlerTable;
632
633 private:
634 AdapterFingerPrint* _fingerprint;
635 address _i2c_entry;
636 address _c2i_entry;
637 address _c2i_unverified_entry;
638
639 #ifdef ASSERT
640 // Captures code and signature used to generate this adapter when
641 // verifing adapter equivalence.
642 unsigned char* _saved_code;
643 int _saved_code_length;
644 #endif
645
646 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
647 _fingerprint = fingerprint;
648 _i2c_entry = i2c_entry;
649 _c2i_entry = c2i_entry;
650 _c2i_unverified_entry = c2i_unverified_entry;
651 #ifdef ASSERT
652 _saved_code = NULL;
653 _saved_code_length = 0;
654 #endif
655 }
656
657 void deallocate();
658
659 // should never be used
660 AdapterHandlerEntry();
661
662 public:
663 address get_i2c_entry() const { return _i2c_entry; }
664 address get_c2i_entry() const { return _c2i_entry; }
665 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
666 address base_address();
667 void relocate(address new_base);
668
669 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
670
671 AdapterHandlerEntry* next() {
672 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
673 }
674
675 #ifdef ASSERT
676 // Used to verify that code generated for shared adapters is equivalent
677 void save_code (unsigned char* code, int length);
678 bool compare_code(unsigned char* code, int length);
679 #endif
680
681 //virtual void print_on(outputStream* st) const; DO NOT USE
682 void print_adapter_on(outputStream* st) const;
683 };
684
685 class AdapterHandlerLibrary: public AllStatic {
686 private:
687 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
688 static AdapterHandlerTable* _adapters;
689 static AdapterHandlerEntry* _abstract_method_handler;
690 static BufferBlob* buffer_blob();
691 static void initialize();
692
693 public:
694
695 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
696 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
697 static void create_native_wrapper(methodHandle method);
698 static AdapterHandlerEntry* get_adapter(methodHandle method);
699
700 #ifdef HAVE_DTRACE_H
701 static nmethod* create_dtrace_nmethod (methodHandle method);
702 #endif // HAVE_DTRACE_H
703
704 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
705 static void print_handler_on(outputStream* st, CodeBlob* b);
706 static bool contains(CodeBlob* b);
707 #ifndef PRODUCT
708 static void print_statistics();
709 #endif /* PRODUCT */
710
711 };
712
713 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP