1 /*
2 * Copyright (c) 1997, 2013, 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 static address _memento_stack_trace_return_handler;
65 static address _memento_stack_trace_exception_handler;
66
67 static DeoptimizationBlob* _deopt_blob;
68
69 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
70 static SafepointBlob* _polling_page_safepoint_handler_blob;
71 static SafepointBlob* _polling_page_return_handler_blob;
72
73 #ifdef COMPILER2
74 static UncommonTrapBlob* _uncommon_trap_blob;
75 #endif // COMPILER2
76
77 #ifndef PRODUCT
78 // Counters
79 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
80 #endif // !PRODUCT
81
82 private:
83 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
84 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
85 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
86 static void generate_memento_stack_trace_blob();
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 #ifdef __SOFTFP__
108 static jfloat fadd(jfloat x, jfloat y);
109 static jfloat fsub(jfloat x, jfloat y);
110 static jfloat fmul(jfloat x, jfloat y);
111 static jfloat fdiv(jfloat x, jfloat y);
112
113 static jdouble dadd(jdouble x, jdouble y);
114 static jdouble dsub(jdouble x, jdouble y);
115 static jdouble dmul(jdouble x, jdouble y);
116 static jdouble ddiv(jdouble x, jdouble y);
117 #endif // __SOFTFP__
118
119 // float conversion (needs to set appropriate rounding mode)
120 static jint f2i (jfloat x);
121 static jlong f2l (jfloat x);
122 static jint d2i (jdouble x);
123 static jlong d2l (jdouble x);
124 static jfloat d2f (jdouble x);
125 static jfloat l2f (jlong x);
126 static jdouble l2d (jlong x);
127
128 #ifdef __SOFTFP__
129 static jfloat i2f (jint x);
130 static jdouble i2d (jint x);
131 static jdouble f2d (jfloat x);
132 #endif // __SOFTFP__
133
134 // double trigonometrics and transcendentals
135 static jdouble dsin(jdouble x);
136 static jdouble dcos(jdouble x);
137 static jdouble dtan(jdouble x);
138 static jdouble dlog(jdouble x);
139 static jdouble dlog10(jdouble x);
140 static jdouble dexp(jdouble x);
141 static jdouble dpow(jdouble x, jdouble y);
142
143 #if defined(__SOFTFP__) || defined(E500V2)
144 static double dabs(double f);
145 #endif
146
147 #if defined(__SOFTFP__) || defined(PPC32)
148 static double dsqrt(double f);
149 #endif
150
151 // Montgomery multiplication
152 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
153 jint len, jlong inv, jint *m_ints);
154 static void montgomery_square(jint *a_ints, jint *n_ints,
155 jint len, jlong inv, jint *m_ints);
156
157 #ifdef __SOFTFP__
158 // C++ compiler generates soft float instructions as well as passing
159 // float and double in registers.
160 static int fcmpl(float x, float y);
161 static int fcmpg(float x, float y);
162 static int dcmpl(double x, double y);
163 static int dcmpg(double x, double y);
164
165 static int unordered_fcmplt(float x, float y);
166 static int unordered_dcmplt(double x, double y);
167 static int unordered_fcmple(float x, float y);
168 static int unordered_dcmple(double x, double y);
169 static int unordered_fcmpge(float x, float y);
170 static int unordered_dcmpge(double x, double y);
171 static int unordered_fcmpgt(float x, float y);
172 static int unordered_dcmpgt(double x, double y);
173
174 static float fneg(float f);
175 static double dneg(double f);
176 #endif
177
178 // exception handling across interpreter/compiler boundaries
179 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
180 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
181
182 #if INCLUDE_ALL_GCS
183 // G1 write barriers
184 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
185 static void g1_wb_post(void* card_addr, JavaThread* thread);
186 #endif // INCLUDE_ALL_GCS
187
188 // exception handling and implicit exceptions
189 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
190 bool force_unwind, bool top_frame_only);
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 address continuation_for_implicit_exception(JavaThread* thread,
203 address faulting_pc,
204 ImplicitExceptionKind exception_kind);
205
206 // Shared stub locations
207 static address get_poll_stub(address pc);
208
209 static address get_ic_miss_stub() {
210 assert(_ic_miss_blob!= NULL, "oops");
211 return _ic_miss_blob->entry_point();
212 }
213
214 static address get_handle_wrong_method_stub() {
215 assert(_wrong_method_blob!= NULL, "oops");
216 return _wrong_method_blob->entry_point();
217 }
218
219 static address get_handle_wrong_method_abstract_stub() {
220 assert(_wrong_method_abstract_blob!= NULL, "oops");
221 return _wrong_method_abstract_blob->entry_point();
222 }
223
224 #ifdef COMPILER2
225 static void generate_uncommon_trap_blob(void);
226 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
227 #endif // COMPILER2
228
229 static address get_resolve_opt_virtual_call_stub(){
230 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
231 return _resolve_opt_virtual_call_blob->entry_point();
232 }
233 static address get_resolve_virtual_call_stub() {
234 assert(_resolve_virtual_call_blob != NULL, "oops");
235 return _resolve_virtual_call_blob->entry_point();
236 }
237 static address get_resolve_static_call_stub() {
238 assert(_resolve_static_call_blob != NULL, "oops");
239 return _resolve_static_call_blob->entry_point();
240 }
241
242 static address get_memento_stack_trace_return_handler() { return _memento_stack_trace_return_handler; }
243 static address get_memento_stack_trace_exception_handler() { return _memento_stack_trace_exception_handler; }
244 static bool is_memento_stack_trace_return_handler(address addr) { return addr == _memento_stack_trace_return_handler; }
245 static bool is_memento_stack_trace_exception_handler(address addr) { return addr == _memento_stack_trace_exception_handler; }
246
247 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
248 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
249 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
250
251 // Counters
252 #ifndef PRODUCT
253 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
254 #endif // PRODUCT
255
256 // Helper routine for full-speed JVMTI exception throwing support
257 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
258 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
259
260 // RedefineClasses() tracing support for obsolete method entry
261 static int rc_trace_method_entry(JavaThread* thread, Method* m);
262
263 // To be used as the entry point for unresolved native methods.
264 static address native_method_throw_unsatisfied_link_error_entry();
265 static address native_method_throw_unsupported_operation_exception_entry();
266
267 // bytecode tracing is only used by the TraceBytecodes
268 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
269
270 // Used to back off a spin lock that is under heavy contention
271 static void yield_all(JavaThread* thread, int attempts = 0);
272
273 static oop retrieve_receiver( Symbol* sig, frame caller );
274
275 static void register_finalizer(JavaThread* thread, oopDesc* obj);
276
277 // dtrace notifications
278 static int dtrace_object_alloc(oopDesc* o, int size);
279 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
280 static int dtrace_method_entry(JavaThread* thread, Method* m);
281 static int dtrace_method_exit(JavaThread* thread, Method* m);
282
283 // Utility method for retrieving the Java thread id, returns 0 if the
284 // thread is not a well formed Java thread.
285 static jlong get_java_tid(Thread* thread);
286
287
288 // used by native wrappers to reenable yellow if overflow happened in native code
289 static void reguard_yellow_pages();
290
291 /**
292 * Fill in the "X cannot be cast to a Y" message for ClassCastException
293 *
294 * @param thr the current thread
295 * @param name the name of the class of the object attempted to be cast
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 it's callers) must use a ResourceMark
302 * in order to correctly free the result.
303 */
304 static char* generate_class_cast_message(JavaThread* thr, const char* name);
305
306 /**
307 * Fill in the "X cannot be cast to a Y" message for ClassCastException
308 *
309 * @param name the name of the class of the object attempted to be cast
310 * @param klass the name of the target klass attempt
311 * @param gripe the specific kind of problem being reported
312 * @return the dynamically allocated exception message (must be freed
313 * by the caller using a resource mark)
314 *
315 * This version does not require access the frame, so it can be called
316 * from interpreted code
317 * The caller (or one of it's callers) must use a ResourceMark
318 * in order to correctly free the result.
319 */
320 static char* generate_class_cast_message(const char* name, const char* klass,
321 const char* gripe = " cannot be cast to ");
322
323 // Resolves a call site- may patch in the destination of the call into the
324 // compiled code.
325 static methodHandle resolve_helper(JavaThread *thread,
326 bool is_virtual,
327 bool is_optimized, TRAPS);
328
329 private:
330 // deopt blob
331 static void generate_deopt_blob(void);
332
333 public:
334 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
335
336 // Resets a call-site in compiled code so it will get resolved again.
337 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
338
339 // In the code prolog, if the klass comparison fails, the inline cache
340 // misses and the call site is patched to megamorphic
341 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
342
343 // Find the method that called us.
344 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
345
346
347 private:
348 static Handle find_callee_info(JavaThread* thread,
349 Bytecodes::Code& bc,
350 CallInfo& callinfo, TRAPS);
351 static Handle find_callee_info_helper(JavaThread* thread,
352 vframeStream& vfst,
353 Bytecodes::Code& bc,
354 CallInfo& callinfo, TRAPS);
355
356 static address clean_virtual_call_entry();
357 static address clean_opt_virtual_call_entry();
358 static address clean_static_call_entry();
359
360 public:
361
362 // Read the array of BasicTypes from a Java signature, and compute where
363 // compiled Java code would like to put the results. Values in reg_lo and
364 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
365 // registers, those above refer to 4-byte stack slots. All stack slots are
366 // based off of the window top. SharedInfo::stack0 refers to the first usable
367 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
368 // 4-bytes higher. So for sparc because the register window save area is at
369 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
370 // will be just above it. (
371 // return value is the maximum number of VMReg stack slots the convention will use.
372 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
373
374 static void check_member_name_argument_is_last_argument(methodHandle method,
375 const BasicType* sig_bt,
376 const VMRegPair* regs) NOT_DEBUG_RETURN;
377
378 // Ditto except for calling C
379 //
380 // C argument in register AND stack slot.
381 // Some architectures require that an argument must be passed in a register
382 // AND in a stack slot. These architectures provide a second VMRegPair array
383 // to be filled by the c_calling_convention method. On other architectures,
384 // NULL is being passed as the second VMRegPair array, so arguments are either
385 // passed in a register OR in a stack slot.
386 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
387 int total_args_passed);
388
389 // Compute the new number of arguments in the signature if 32 bit ints
390 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
391 // is true.
392 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
393 // Adapt a method's signature if it contains 32 bit integers that must
394 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
395 // is true.
396 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
397 BasicType*& in_sig_bt, VMRegPair*& in_regs);
398
399 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
400 // blobs. Unlike adapters in the tiger and earlier releases the code in these
401 // blobs does not create a new frame and are therefore virtually invisible
402 // to the stack walking code. In general these blobs extend the callers stack
403 // as needed for the conversion of argument locations.
404
405 // When calling a c2i blob the code will always call the interpreter even if
406 // by the time we reach the blob there is compiled code available. This allows
407 // the blob to pass the incoming stack pointer (the sender sp) in a known
408 // location for the interpreter to record. This is used by the frame code
409 // to correct the sender code to match up with the stack pointer when the
410 // thread left the compiled code. In addition it allows the interpreter
411 // to remove the space the c2i adapter allocated to do its argument conversion.
412
413 // Although a c2i blob will always run interpreted even if compiled code is
414 // present if we see that compiled code is present the compiled call site
415 // will be patched/re-resolved so that later calls will run compiled.
416
417 // Aditionally a c2i blob need to have a unverified entry because it can be reached
418 // in situations where the call site is an inlined cache site and may go megamorphic.
419
420 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
421 // that the interpreter before it does any call dispatch will record the current
422 // stack pointer in the interpreter frame. On return it will restore the stack
423 // pointer as needed. This means the i2c adapter code doesn't need any special
424 // handshaking path with compiled code to keep the stack walking correct.
425
426 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
427 int total_args_passed,
428 int max_arg,
429 const BasicType *sig_bt,
430 const VMRegPair *regs,
431 AdapterFingerPrint* fingerprint);
432
433 // OSR support
434
435 // OSR_migration_begin will extract the jvm state from an interpreter
436 // frame (locals, monitors) and store the data in a piece of C heap
437 // storage. This then allows the interpreter frame to be removed from the
438 // stack and the OSR nmethod to be called. That method is called with a
439 // pointer to the C heap storage. This pointer is the return value from
440 // OSR_migration_begin.
441
442 static intptr_t* OSR_migration_begin( JavaThread *thread);
443
444 // OSR_migration_end is a trivial routine. It is called after the compiled
445 // method has extracted the jvm state from the C heap that OSR_migration_begin
446 // created. It's entire job is to simply free this storage.
447 static void OSR_migration_end ( intptr_t* buf);
448
449 // Convert a sig into a calling convention register layout
450 // and find interesting things about it.
451 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
452 static VMReg name_for_receiver();
453
454 // "Top of Stack" slots that may be unused by the calling convention but must
455 // otherwise be preserved.
456 // On Intel these are not necessary and the value can be zero.
457 // On Sparc this describes the words reserved for storing a register window
458 // when an interrupt occurs.
459 static uint out_preserve_stack_slots();
460
461 // Is vector's size (in bytes) bigger than a size saved by default?
462 // For example, on x86 16 bytes XMM registers are saved by default.
463 static bool is_wide_vector(int size);
464
465 // Save and restore a native result
466 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
467 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
468
469 // Generate a native wrapper for a given method. The method takes arguments
470 // in the Java compiled code convention, marshals them to the native
471 // convention (handlizes oops, etc), transitions to native, makes the call,
472 // returns to java state (possibly blocking), unhandlizes any result and
473 // returns.
474 //
475 // The wrapper may contain special-case code if the given method
476 // is a JNI critical method, or a compiled method handle adapter,
477 // such as _invokeBasic, _linkToVirtual, etc.
478 static nmethod* generate_native_wrapper(MacroAssembler* masm,
479 methodHandle method,
480 int compile_id,
481 BasicType* sig_bt,
482 VMRegPair* regs,
483 BasicType ret_type );
484
485 // Block before entering a JNI critical method
486 static void block_for_jni_critical(JavaThread* thread);
487
488 #ifdef HAVE_DTRACE_H
489 // Generate a dtrace wrapper for a given method. The method takes arguments
490 // in the Java compiled code convention, marshals them to the native
491 // convention (handlizes oops, etc), transitions to native, makes the call,
492 // returns to java state (possibly blocking), unhandlizes any result and
493 // returns.
494 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
495 methodHandle method);
496
497 // dtrace support to convert a Java string to utf8
498 static void get_utf(oopDesc* src, address dst);
499 #endif // def HAVE_DTRACE_H
500
501 // A compiled caller has just called the interpreter, but compiled code
502 // exists. Patch the caller so he no longer calls into the interpreter.
503 static void fixup_callers_callsite(Method* moop, address ret_pc);
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);
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 #ifndef PRODUCT
526
527 // Collect and print inline cache miss statistics
528 private:
529 enum { maxICmiss_count = 100 };
530 static int _ICmiss_index; // length of IC miss histogram
531 static int _ICmiss_count[maxICmiss_count]; // miss counts
532 static address _ICmiss_at[maxICmiss_count]; // miss addresses
533 static void trace_ic_miss(address at);
534
535 public:
536 static int _monitor_enter_ctr; // monitor enter slow
537 static int _monitor_exit_ctr; // monitor exit slow
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 contigious.
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 offical 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 // verifing 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 class AdapterHandlerLibrary: public AllStatic {
690 private:
691 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
692 static AdapterHandlerTable* _adapters;
693 static AdapterHandlerEntry* _abstract_method_handler;
694 static BufferBlob* buffer_blob();
695 static void initialize();
696
697 public:
698
699 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
700 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
701 static void create_native_wrapper(methodHandle method);
702 static AdapterHandlerEntry* get_adapter(methodHandle method);
703
704 #ifdef HAVE_DTRACE_H
705 static nmethod* create_dtrace_nmethod (methodHandle method);
706 #endif // HAVE_DTRACE_H
707
708 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
709 static void print_handler_on(outputStream* st, CodeBlob* b);
710 static bool contains(CodeBlob* b);
711 #ifndef PRODUCT
712 static void print_statistics();
713 #endif /* PRODUCT */
714
715 };
716
717 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP