1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
27
28 #include "interpreter/bytecodeHistogram.hpp"
29 #include "interpreter/bytecodeTracer.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "utilities/hashtable.hpp"
34 #include "utilities/macros.hpp"
35
36 class AdapterHandlerEntry;
37 class AdapterHandlerTable;
38 class AdapterFingerPrint;
39 class vframeStream;
40
41 // 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 methodHandle resolve_sub_helper(JavaThread *thread,
52 bool is_virtual,
53 bool is_optimized, TRAPS);
54
55 // Shared stub locations
56
57 static RuntimeStub* _wrong_method_blob;
58 static RuntimeStub* _wrong_method_abstract_blob;
59 static RuntimeStub* _ic_miss_blob;
60 static RuntimeStub* _resolve_opt_virtual_call_blob;
61 static RuntimeStub* _resolve_virtual_call_blob;
62 static RuntimeStub* _resolve_static_call_blob;
63
64 static DeoptimizationBlob* _deopt_blob;
65
66 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
67 static SafepointBlob* _polling_page_safepoint_handler_blob;
68 static SafepointBlob* _polling_page_return_handler_blob;
69
70 #ifdef COMPILER2
71 static UncommonTrapBlob* _uncommon_trap_blob;
72 #endif // COMPILER2
73
74 #ifndef PRODUCT
75 // Counters
76 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
77 #endif // !PRODUCT
78
79 private:
80 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
81 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
82 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
83
84 public:
85 static void generate_stubs(void);
86
87 // max bytes for each dtrace string parameter
88 enum { max_dtrace_string_size = 256 };
89
90 // The following arithmetic routines are used on platforms that do
91 // not have machine instructions to implement their functionality.
92 // Do not remove these.
93
94 // long arithmetics
95 static jlong lmul(jlong y, jlong x);
96 static jlong ldiv(jlong y, jlong x);
97 static jlong lrem(jlong y, jlong x);
98
99 // float and double remainder
100 static jfloat frem(jfloat x, jfloat y);
101 static jdouble drem(jdouble x, jdouble y);
102
103
104 #ifdef _WIN64
105 // Workaround for fmod issue in the Windows x64 CRT
106 static double fmod_winx64(double x, double y);
107 #endif
108
109 #ifdef __SOFTFP__
110 static jfloat fadd(jfloat x, jfloat y);
111 static jfloat fsub(jfloat x, jfloat y);
112 static jfloat fmul(jfloat x, jfloat y);
113 static jfloat fdiv(jfloat x, jfloat y);
114
115 static jdouble dadd(jdouble x, jdouble y);
116 static jdouble dsub(jdouble x, jdouble y);
117 static jdouble dmul(jdouble x, jdouble y);
118 static jdouble ddiv(jdouble x, jdouble y);
119 #endif // __SOFTFP__
120
121 // float conversion (needs to set appropriate rounding mode)
122 static jint f2i (jfloat x);
123 static jlong f2l (jfloat x);
124 static jint d2i (jdouble x);
125 static jlong d2l (jdouble x);
126 static jfloat d2f (jdouble x);
127 static jfloat l2f (jlong x);
128 static jdouble l2d (jlong x);
129
130 #ifdef __SOFTFP__
131 static jfloat i2f (jint x);
132 static jdouble i2d (jint x);
133 static jdouble f2d (jfloat x);
134 #endif // __SOFTFP__
135
136 // double trigonometrics and transcendentals
137 static jdouble dsin(jdouble x);
138 static jdouble dcos(jdouble x);
139 static jdouble dtan(jdouble x);
140 static jdouble dlog(jdouble x);
141 static jdouble dlog10(jdouble x);
142 static jdouble dexp(jdouble x);
143 static jdouble dpow(jdouble x, jdouble y);
144
145 #if defined(__SOFTFP__) || defined(E500V2)
146 static double dabs(double f);
147 #endif
148
149 #if defined(__SOFTFP__) || defined(PPC)
150 static double dsqrt(double f);
151 #endif
152
153 // Montgomery multiplication
154 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
155 jint len, jlong inv, jint *m_ints);
156 static void montgomery_square(jint *a_ints, jint *n_ints,
157 jint len, jlong inv, jint *m_ints);
158
159 #ifdef __SOFTFP__
160 // C++ compiler generates soft float instructions as well as passing
161 // float and double in registers.
162 static int fcmpl(float x, float y);
163 static int fcmpg(float x, float y);
164 static int dcmpl(double x, double y);
165 static int dcmpg(double x, double y);
166
167 static int unordered_fcmplt(float x, float y);
168 static int unordered_dcmplt(double x, double y);
169 static int unordered_fcmple(float x, float y);
170 static int unordered_dcmple(double x, double y);
171 static int unordered_fcmpge(float x, float y);
172 static int unordered_dcmpge(double x, double y);
173 static int unordered_fcmpgt(float x, float y);
174 static int unordered_dcmpgt(double x, double y);
175
176 static float fneg(float f);
177 static double dneg(double f);
178 #endif
179
180 // exception handling across interpreter/compiler boundaries
181 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
182 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
183
184 #if INCLUDE_ALL_GCS
185 // G1 write barriers
186 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
187 static void g1_wb_post(void* card_addr, JavaThread* thread);
188 #endif // INCLUDE_ALL_GCS
189
190 // exception handling and implicit exceptions
191 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
192 bool force_unwind, bool top_frame_only);
193 enum ImplicitExceptionKind {
194 IMPLICIT_NULL,
195 IMPLICIT_DIVIDE_BY_ZERO,
196 STACK_OVERFLOW
197 };
198 static void throw_AbstractMethodError(JavaThread* thread);
199 static void throw_IncompatibleClassChangeError(JavaThread* thread);
200 static void throw_ArithmeticException(JavaThread* thread);
201 static void throw_NullPointerException(JavaThread* thread);
202 static void throw_NullPointerException_at_call(JavaThread* thread);
203 static void throw_StackOverflowError(JavaThread* thread);
204 static void throw_delayed_StackOverflowError(JavaThread* thread);
205 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed);
206 static address continuation_for_implicit_exception(JavaThread* thread,
207 address faulting_pc,
208 ImplicitExceptionKind exception_kind);
209 #if INCLUDE_JVMCI
210 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, nmethod* nm, int deopt_reason);
211 #endif
212
213 static void enable_stack_reserved_zone(JavaThread* thread);
214 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
215
216 // Shared stub locations
217 static address get_poll_stub(address pc);
218
219 static address get_ic_miss_stub() {
220 assert(_ic_miss_blob!= NULL, "oops");
221 return _ic_miss_blob->entry_point();
222 }
223
224 static address get_handle_wrong_method_stub() {
225 assert(_wrong_method_blob!= NULL, "oops");
226 return _wrong_method_blob->entry_point();
227 }
228
229 static address get_handle_wrong_method_abstract_stub() {
230 assert(_wrong_method_abstract_blob!= NULL, "oops");
231 return _wrong_method_abstract_blob->entry_point();
232 }
233
234 #ifdef COMPILER2
235 static void generate_uncommon_trap_blob(void);
236 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
237 #endif // COMPILER2
238
239 static address get_resolve_opt_virtual_call_stub() {
240 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
241 return _resolve_opt_virtual_call_blob->entry_point();
242 }
243 static address get_resolve_virtual_call_stub() {
244 assert(_resolve_virtual_call_blob != NULL, "oops");
245 return _resolve_virtual_call_blob->entry_point();
246 }
247 static address get_resolve_static_call_stub() {
248 assert(_resolve_static_call_blob != NULL, "oops");
249 return _resolve_static_call_blob->entry_point();
250 }
251
252 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
253 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
254 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
255
256 // Counters
257 #ifndef PRODUCT
258 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
259 #endif // PRODUCT
260
261 // Helper routine for full-speed JVMTI exception throwing support
262 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
263 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
264
265 // RedefineClasses() tracing support for obsolete method entry
266 static int rc_trace_method_entry(JavaThread* thread, Method* m);
267
268 // To be used as the entry point for unresolved native methods.
269 static address native_method_throw_unsatisfied_link_error_entry();
270 static address native_method_throw_unsupported_operation_exception_entry();
271
272 // bytecode tracing is only used by the TraceBytecodes
273 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
274
275 static oop retrieve_receiver(Symbol* sig, frame caller);
276
277 static void register_finalizer(JavaThread* thread, oopDesc* obj);
278
279 // dtrace notifications
280 static int dtrace_object_alloc(oopDesc* o, int size);
281 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
282 static int dtrace_method_entry(JavaThread* thread, Method* m);
283 static int dtrace_method_exit(JavaThread* thread, Method* m);
284
285 // Utility method for retrieving the Java thread id, returns 0 if the
286 // thread is not a well formed Java thread.
287 static jlong get_java_tid(Thread* thread);
288
289
290 // used by native wrappers to reenable yellow if overflow happened in native code
291 static void reguard_yellow_pages();
292
293 // Fill in the "X cannot be cast to a Y" message for ClassCastException
294 //
295 // @param thr the current thread
296 // @param name the name of the class of the object attempted to be cast
297 // @return the dynamically allocated exception message (must be freed
298 // by the caller using a resource mark)
299 //
300 // BCP must refer to the current 'checkcast' opcode for the frame
301 // on top of the stack.
302 // The caller (or one of it's callers) must use a ResourceMark
303 // in order to correctly free the result.
304 //
305 static char* generate_class_cast_message(JavaThread* thr, const char* name);
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 methodHandle extract_attached_method(vframeStream& vfst);
357
358 static address clean_virtual_call_entry();
359 static address clean_opt_virtual_call_entry();
360 static address clean_static_call_entry();
361
362 #if defined(X86) && defined(COMPILER1)
363 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
364 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, methodHandle method, Register obj_reg, Register result);
365 #endif // X86 && COMPILER1
366
367 public:
368
369 // Read the array of BasicTypes from a Java signature, and compute where
370 // compiled Java code would like to put the results. Values in reg_lo and
371 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
372 // registers, those above refer to 4-byte stack slots. All stack slots are
373 // based off of the window top. SharedInfo::stack0 refers to the first usable
374 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
375 // 4-bytes higher. So for sparc because the register window save area is at
376 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
377 // will be just above it. (
378 // return value is the maximum number of VMReg stack slots the convention will use.
379 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
380
381 static void check_member_name_argument_is_last_argument(const methodHandle& method,
382 const BasicType* sig_bt,
383 const VMRegPair* regs) NOT_DEBUG_RETURN;
384
385 // Ditto except for calling C
386 //
387 // C argument in register AND stack slot.
388 // Some architectures require that an argument must be passed in a register
389 // AND in a stack slot. These architectures provide a second VMRegPair array
390 // to be filled by the c_calling_convention method. On other architectures,
391 // NULL is being passed as the second VMRegPair array, so arguments are either
392 // passed in a register OR in a stack slot.
393 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
394 int total_args_passed);
395
396 // Compute the new number of arguments in the signature if 32 bit ints
397 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
398 // is true.
399 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
400 // Adapt a method's signature if it contains 32 bit integers that must
401 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
402 // is true.
403 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
404 BasicType*& in_sig_bt, VMRegPair*& in_regs);
405
406 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
407 // blobs. Unlike adapters in the tiger and earlier releases the code in these
408 // blobs does not create a new frame and are therefore virtually invisible
409 // to the stack walking code. In general these blobs extend the callers stack
410 // as needed for the conversion of argument locations.
411
412 // When calling a c2i blob the code will always call the interpreter even if
413 // by the time we reach the blob there is compiled code available. This allows
414 // the blob to pass the incoming stack pointer (the sender sp) in a known
415 // location for the interpreter to record. This is used by the frame code
416 // to correct the sender code to match up with the stack pointer when the
417 // thread left the compiled code. In addition it allows the interpreter
418 // to remove the space the c2i adapter allocated to do its argument conversion.
419
420 // Although a c2i blob will always run interpreted even if compiled code is
421 // present if we see that compiled code is present the compiled call site
422 // will be patched/re-resolved so that later calls will run compiled.
423
424 // Additionally a c2i blob need to have a unverified entry because it can be reached
425 // in situations where the call site is an inlined cache site and may go megamorphic.
426
427 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
428 // that the interpreter before it does any call dispatch will record the current
429 // stack pointer in the interpreter frame. On return it will restore the stack
430 // pointer as needed. This means the i2c adapter code doesn't need any special
431 // handshaking path with compiled code to keep the stack walking correct.
432
433 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
434 int total_args_passed,
435 int max_arg,
436 const BasicType *sig_bt,
437 const VMRegPair *regs,
438 AdapterFingerPrint* fingerprint);
439
440 static void gen_i2c_adapter(MacroAssembler *_masm,
441 int total_args_passed,
442 int comp_args_on_stack,
443 const BasicType *sig_bt,
444 const VMRegPair *regs);
445
446 // OSR support
447
448 // OSR_migration_begin will extract the jvm state from an interpreter
449 // frame (locals, monitors) and store the data in a piece of C heap
450 // storage. This then allows the interpreter frame to be removed from the
451 // stack and the OSR nmethod to be called. That method is called with a
452 // pointer to the C heap storage. This pointer is the return value from
453 // OSR_migration_begin.
454
455 static intptr_t* OSR_migration_begin(JavaThread *thread);
456
457 // OSR_migration_end is a trivial routine. It is called after the compiled
458 // method has extracted the jvm state from the C heap that OSR_migration_begin
459 // created. It's entire job is to simply free this storage.
460 static void OSR_migration_end(intptr_t* buf);
461
462 // Convert a sig into a calling convention register layout
463 // and find interesting things about it.
464 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
465 static VMReg name_for_receiver();
466
467 // "Top of Stack" slots that may be unused by the calling convention but must
468 // otherwise be preserved.
469 // On Intel these are not necessary and the value can be zero.
470 // On Sparc this describes the words reserved for storing a register window
471 // when an interrupt occurs.
472 static uint out_preserve_stack_slots();
473
474 // Is vector's size (in bytes) bigger than a size saved by default?
475 // For example, on x86 16 bytes XMM registers are saved by default.
476 static bool is_wide_vector(int size);
477
478 // Save and restore a native result
479 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
480 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
481
482 // Generate a native wrapper for a given method. The method takes arguments
483 // in the Java compiled code convention, marshals them to the native
484 // convention (handlizes oops, etc), transitions to native, makes the call,
485 // returns to java state (possibly blocking), unhandlizes any result and
486 // returns.
487 //
488 // The wrapper may contain special-case code if the given method
489 // is a JNI critical method, or a compiled method handle adapter,
490 // such as _invokeBasic, _linkToVirtual, etc.
491 static nmethod* generate_native_wrapper(MacroAssembler* masm,
492 const methodHandle& method,
493 int compile_id,
494 BasicType* sig_bt,
495 VMRegPair* regs,
496 BasicType ret_type);
497
498 // Block before entering a JNI critical method
499 static void block_for_jni_critical(JavaThread* thread);
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 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
505
506 // Slow-path Locking and Unlocking
507 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
508 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
509
510 // Resolving of calls
511 static address resolve_static_call_C (JavaThread *thread);
512 static address resolve_virtual_call_C (JavaThread *thread);
513 static address resolve_opt_virtual_call_C(JavaThread *thread);
514
515 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
516 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
517 oopDesc* dest, jint dest_pos,
518 jint length, JavaThread* thread);
519
520 // handle ic miss with caller being compiled code
521 // wrong method handling (inline cache misses, zombie methods)
522 static address handle_wrong_method(JavaThread* thread);
523 static address handle_wrong_method_abstract(JavaThread* thread);
524 static address handle_wrong_method_ic_miss(JavaThread* thread);
525
526 #ifndef PRODUCT
527
528 // Collect and print inline cache miss statistics
529 private:
530 enum { maxICmiss_count = 100 };
531 static int _ICmiss_index; // length of IC miss histogram
532 static int _ICmiss_count[maxICmiss_count]; // miss counts
533 static address _ICmiss_at[maxICmiss_count]; // miss addresses
534 static void trace_ic_miss(address at);
535
536 public:
537 static int _throw_null_ctr; // throwing a null-pointer exception
538 static int _ic_miss_ctr; // total # of IC misses
539 static int _wrong_method_ctr;
540 static int _resolve_static_ctr;
541 static int _resolve_virtual_ctr;
542 static int _resolve_opt_virtual_ctr;
543 static int _implicit_null_throws;
544 static int _implicit_div0_throws;
545
546 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
547 static int _jshort_array_copy_ctr; // Slow-path short array copy
548 static int _jint_array_copy_ctr; // Slow-path int array copy
549 static int _jlong_array_copy_ctr; // Slow-path long array copy
550 static int _oop_array_copy_ctr; // Slow-path oop array copy
551 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
552 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
553 static int _generic_array_copy_ctr; // Slow-path includes type decoding
554 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
555
556 static int _new_instance_ctr; // 'new' object requires GC
557 static int _new_array_ctr; // 'new' array requires GC
558 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
559 static int _find_handler_ctr; // find exception handler
560 static int _rethrow_ctr; // rethrow exception
561 static int _mon_enter_stub_ctr; // monitor enter stub
562 static int _mon_exit_stub_ctr; // monitor exit stub
563 static int _mon_enter_ctr; // monitor enter slow
564 static int _mon_exit_ctr; // monitor exit slow
565 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
566
567 // Statistics code
568 // stats for "normal" compiled calls (non-interface)
569 static int _nof_normal_calls; // total # of calls
570 static int _nof_optimized_calls; // total # of statically-bound calls
571 static int _nof_inlined_calls; // total # of inlined normal calls
572 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
573 static int _nof_inlined_static_calls; // total # of inlined static calls
574 // stats for compiled interface calls
575 static int _nof_interface_calls; // total # of compiled calls
576 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
577 static int _nof_inlined_interface_calls; // total # of inlined interface calls
578 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
579 // stats for runtime exceptions
580 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
581
582 public: // for compiler
583 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
584 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
585 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
586 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
587 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
588 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
589 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
590 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
591 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
592 static void print_call_statistics(int comp_total);
593 static void print_statistics();
594 static void print_ic_miss_histogram();
595
596 #endif // PRODUCT
597 };
598
599
600 // ---------------------------------------------------------------------------
601 // Implementation of AdapterHandlerLibrary
602 //
603 // This library manages argument marshaling adapters and native wrappers.
604 // There are 2 flavors of adapters: I2C and C2I.
605 //
606 // The I2C flavor takes a stock interpreted call setup, marshals the
607 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
608 // code_begin(). It is broken to call it without an nmethod assigned.
609 // The usual behavior is to lift any register arguments up out of the
610 // stack and possibly re-pack the extra arguments to be contiguous.
611 // I2C adapters will save what the interpreter's stack pointer will be
612 // after arguments are popped, then adjust the interpreter's frame
613 // size to force alignment and possibly to repack the arguments.
614 // After re-packing, it jumps to the compiled code start. There are
615 // no safepoints in this adapter code and a GC cannot happen while
616 // marshaling is in progress.
617 //
618 // The C2I flavor takes a stock compiled call setup plus the target method in
619 // Rmethod, marshals the arguments for an interpreted call and jumps to
620 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
621 // setup. Compiled frames are fixed-size and the args are likely not in the
622 // right place. Hence all the args will likely be copied into the
623 // interpreter's frame, forcing that frame to grow. The compiled frame's
624 // outgoing stack args will be dead after the copy.
625 //
626 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
627 // also perform an official frame push & pop. They have a call to the native
628 // routine in their middles and end in a return (instead of ending in a jump).
629 // The native wrappers are stored in real nmethods instead of the BufferBlobs
630 // used by the adapters. The code generation happens here because it's very
631 // similar to what the adapters have to do.
632
633 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
634 friend class AdapterHandlerTable;
635
636 private:
637 AdapterFingerPrint* _fingerprint;
638 address _i2c_entry;
639 address _c2i_entry;
640 address _c2i_unverified_entry;
641
642 #ifdef ASSERT
643 // Captures code and signature used to generate this adapter when
644 // verifying adapter equivalence.
645 unsigned char* _saved_code;
646 int _saved_code_length;
647 #endif
648
649 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
650 _fingerprint = fingerprint;
651 _i2c_entry = i2c_entry;
652 _c2i_entry = c2i_entry;
653 _c2i_unverified_entry = c2i_unverified_entry;
654 #ifdef ASSERT
655 _saved_code = NULL;
656 _saved_code_length = 0;
657 #endif
658 }
659
660 void deallocate();
661
662 // should never be used
663 AdapterHandlerEntry();
664
665 public:
666 address get_i2c_entry() const { return _i2c_entry; }
667 address get_c2i_entry() const { return _c2i_entry; }
668 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
669 address base_address();
670 void relocate(address new_base);
671
672 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
673
674 AdapterHandlerEntry* next() {
675 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
676 }
677
678 #ifdef ASSERT
679 // Used to verify that code generated for shared adapters is equivalent
680 void save_code (unsigned char* code, int length);
681 bool compare_code(unsigned char* code, int length);
682 #endif
683
684 //virtual void print_on(outputStream* st) const; DO NOT USE
685 void print_adapter_on(outputStream* st) const;
686 };
687
688 class AdapterHandlerLibrary: public AllStatic {
689 private:
690 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
691 static AdapterHandlerTable* _adapters;
692 static AdapterHandlerEntry* _abstract_method_handler;
693 static BufferBlob* buffer_blob();
694 static void initialize();
695
696 public:
697
698 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
699 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
700 static void create_native_wrapper(const methodHandle& method);
701 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
702
703 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
704 static void print_handler_on(outputStream* st, const CodeBlob* b);
705 static bool contains(const CodeBlob* b);
706 #ifndef PRODUCT
707 static void print_statistics();
708 #endif // PRODUCT
709
710 };
711
712 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP