1 /*
2 * Copyright (c) 1997, 2016, 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 class SigEntry;
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 _resolve_static_call_entry;
65
66 static DeoptimizationBlob* _deopt_blob;
67
68 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
69 static SafepointBlob* _polling_page_safepoint_handler_blob;
70 static SafepointBlob* _polling_page_return_handler_blob;
71
72 #ifdef COMPILER2
73 static UncommonTrapBlob* _uncommon_trap_blob;
74 #endif // COMPILER2
75
76 #ifndef PRODUCT
77 // Counters
78 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
79 #endif // !PRODUCT
80
81 private:
82 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
83 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
84 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
85 static RuntimeStub* generate_return_value_blob(address destination, const char* name);
86 public:
87 static void generate_stubs(void);
88
89 // max bytes for each dtrace string parameter
90 enum { max_dtrace_string_size = 256 };
91
92 // The following arithmetic routines are used on platforms that do
93 // not have machine instructions to implement their functionality.
94 // Do not remove these.
95
96 // long arithmetics
97 static jlong lmul(jlong y, jlong x);
98 static jlong ldiv(jlong y, jlong x);
99 static jlong lrem(jlong y, jlong x);
100
101 // float and double remainder
102 static jfloat frem(jfloat x, jfloat y);
103 static jdouble drem(jdouble x, jdouble y);
104
105
106 #ifdef _WIN64
107 // Workaround for fmod issue in the Windows x64 CRT
108 static double fmod_winx64(double x, double y);
109 #endif
110
111 #ifdef __SOFTFP__
112 static jfloat fadd(jfloat x, jfloat y);
113 static jfloat fsub(jfloat x, jfloat y);
114 static jfloat fmul(jfloat x, jfloat y);
115 static jfloat fdiv(jfloat x, jfloat y);
116
117 static jdouble dadd(jdouble x, jdouble y);
118 static jdouble dsub(jdouble x, jdouble y);
119 static jdouble dmul(jdouble x, jdouble y);
120 static jdouble ddiv(jdouble x, jdouble y);
121 #endif // __SOFTFP__
122
123 // float conversion (needs to set appropriate rounding mode)
124 static jint f2i (jfloat x);
125 static jlong f2l (jfloat x);
126 static jint d2i (jdouble x);
127 static jlong d2l (jdouble x);
128 static jfloat d2f (jdouble x);
129 static jfloat l2f (jlong x);
130 static jdouble l2d (jlong x);
131
132 #ifdef __SOFTFP__
133 static jfloat i2f (jint x);
134 static jdouble i2d (jint x);
135 static jdouble f2d (jfloat x);
136 #endif // __SOFTFP__
137
138 // double trigonometrics and transcendentals
139 static jdouble dsin(jdouble x);
140 static jdouble dcos(jdouble x);
141 static jdouble dtan(jdouble x);
142 static jdouble dlog(jdouble x);
143 static jdouble dlog10(jdouble x);
144 static jdouble dexp(jdouble x);
145 static jdouble dpow(jdouble x, jdouble y);
146
147 #if defined(__SOFTFP__) || defined(E500V2)
148 static double dabs(double f);
149 #endif
150
151 #if defined(__SOFTFP__) || defined(PPC)
152 static double dsqrt(double f);
153 #endif
154
155 // Montgomery multiplication
156 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
157 jint len, jlong inv, jint *m_ints);
158 static void montgomery_square(jint *a_ints, jint *n_ints,
159 jint len, jlong inv, jint *m_ints);
160
161 #ifdef __SOFTFP__
162 // C++ compiler generates soft float instructions as well as passing
163 // float and double in registers.
164 static int fcmpl(float x, float y);
165 static int fcmpg(float x, float y);
166 static int dcmpl(double x, double y);
167 static int dcmpg(double x, double y);
168
169 static int unordered_fcmplt(float x, float y);
170 static int unordered_dcmplt(double x, double y);
171 static int unordered_fcmple(float x, float y);
172 static int unordered_dcmple(double x, double y);
173 static int unordered_fcmpge(float x, float y);
174 static int unordered_dcmpge(double x, double y);
175 static int unordered_fcmpgt(float x, float y);
176 static int unordered_dcmpgt(double x, double y);
177
178 static float fneg(float f);
179 static double dneg(double f);
180 #endif
181
182 // exception handling across interpreter/compiler boundaries
183 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
184 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
185
186 #if INCLUDE_ALL_GCS
187 // G1 write barriers
188 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
189 static void g1_wb_post(void* card_addr, JavaThread* thread);
190 #endif // INCLUDE_ALL_GCS
191
192 // exception handling and implicit exceptions
193 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
194 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
195 enum ImplicitExceptionKind {
196 IMPLICIT_NULL,
197 IMPLICIT_DIVIDE_BY_ZERO,
198 STACK_OVERFLOW
199 };
200 static void throw_AbstractMethodError(JavaThread* thread);
201 static void throw_IncompatibleClassChangeError(JavaThread* thread);
202 static void throw_ArithmeticException(JavaThread* thread);
203 static void throw_NullPointerException(JavaThread* thread);
204 static void throw_NullPointerException_at_call(JavaThread* thread);
205 static void throw_StackOverflowError(JavaThread* thread);
206 static void throw_delayed_StackOverflowError(JavaThread* thread);
207 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed);
208 static address continuation_for_implicit_exception(JavaThread* thread,
209 address faulting_pc,
210 ImplicitExceptionKind exception_kind);
211 #if INCLUDE_JVMCI
212 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason);
213 #endif
214
215 static void enable_stack_reserved_zone(JavaThread* thread);
216 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
217
218 // Shared stub locations
219 static address get_poll_stub(address pc);
220
221 static address get_ic_miss_stub() {
222 assert(_ic_miss_blob!= NULL, "oops");
223 return _ic_miss_blob->entry_point();
224 }
225
226 static address get_handle_wrong_method_stub() {
227 assert(_wrong_method_blob!= NULL, "oops");
228 return _wrong_method_blob->entry_point();
229 }
230
231 static address get_handle_wrong_method_abstract_stub() {
232 assert(_wrong_method_abstract_blob!= NULL, "oops");
233 return _wrong_method_abstract_blob->entry_point();
234 }
235
236 #ifdef COMPILER2
237 static void generate_uncommon_trap_blob(void);
238 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
239 #endif // COMPILER2
240
241 static address get_resolve_opt_virtual_call_stub() {
242 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
243 return _resolve_opt_virtual_call_blob->entry_point();
244 }
245 static address get_resolve_virtual_call_stub() {
246 assert(_resolve_virtual_call_blob != NULL, "oops");
247 return _resolve_virtual_call_blob->entry_point();
248 }
249 static address get_resolve_static_call_stub() {
250 assert(_resolve_static_call_blob != NULL, "oops");
251 return _resolve_static_call_blob->entry_point();
252 }
253
254 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
255 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
256 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
257
258 // Counters
259 #ifndef PRODUCT
260 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
261 #endif // PRODUCT
262
263 // Helper routine for full-speed JVMTI exception throwing support
264 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
265 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
266
267 // RedefineClasses() tracing support for obsolete method entry
268 static int rc_trace_method_entry(JavaThread* thread, Method* m);
269
270 // To be used as the entry point for unresolved native methods.
271 static address native_method_throw_unsatisfied_link_error_entry();
272 static address native_method_throw_unsupported_operation_exception_entry();
273
274 static oop retrieve_receiver(Symbol* sig, frame caller);
275
276 static void register_finalizer(JavaThread* thread, oopDesc* obj);
277
278 // dtrace notifications
279 static int dtrace_object_alloc(oopDesc* o, int size);
280 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
281 static int dtrace_method_entry(JavaThread* thread, Method* m);
282 static int dtrace_method_exit(JavaThread* thread, Method* m);
283
284 // Utility method for retrieving the Java thread id, returns 0 if the
285 // thread is not a well formed Java thread.
286 static jlong get_java_tid(Thread* thread);
287
288
289 // used by native wrappers to reenable yellow if overflow happened in native code
290 static void reguard_yellow_pages();
291
292 // Fill in the "X cannot be cast to a Y" message for ClassCastException
293 //
294 // @param thr the current thread
295 // @param caster_klass the class of the object we are casting
296 // @return the dynamically allocated exception message (must be freed
297 // by the caller using a resource mark)
298 //
299 // BCP must refer to the current 'checkcast' opcode for the frame
300 // on top of the stack.
301 // The caller (or one of its callers) must use a ResourceMark
302 // in order to correctly free the result.
303 //
304 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
305
306 // Fill in the "X cannot be cast to a Y" message for ClassCastException
307 //
308 // @param caster_klass the class of the object we are casting
309 // @param target_klass the target klass attempt
310 // @return the dynamically allocated exception message (must be freed
311 // by the caller using a resource mark)
312 //
313 // This version does not require access the frame, so it can be called
314 // from interpreted code
315 // The caller (or one of it's callers) must use a ResourceMark
316 // in order to correctly free the result.
317 //
318 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass);
319
320 // Resolves a call site- may patch in the destination of the call into the
321 // compiled code.
322 static methodHandle resolve_helper(JavaThread *thread,
323 bool is_virtual,
324 bool is_optimized, TRAPS);
325
326 private:
327 // deopt blob
328 static void generate_deopt_blob(void);
329
330 public:
331 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
332
333 // Resets a call-site in compiled code so it will get resolved again.
334 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
335
336 // In the code prolog, if the klass comparison fails, the inline cache
337 // misses and the call site is patched to megamorphic
338 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
339
340 // Find the method that called us.
341 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
342
343
344 private:
345 static Handle find_callee_info(JavaThread* thread,
346 Bytecodes::Code& bc,
347 CallInfo& callinfo, TRAPS);
348 static Handle find_callee_info_helper(JavaThread* thread,
349 vframeStream& vfst,
350 Bytecodes::Code& bc,
351 CallInfo& callinfo, TRAPS);
352
353 static methodHandle extract_attached_method(vframeStream& vfst);
354
355 static address clean_virtual_call_entry();
356 static address clean_opt_virtual_call_entry();
357 static address clean_static_call_entry();
358
359 #if defined(X86) && defined(COMPILER1)
360 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
361 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, methodHandle method, Register obj_reg, Register result);
362 #endif // X86 && COMPILER1
363
364 public:
365
366 // Read the array of BasicTypes from a Java signature, and compute where
367 // compiled Java code would like to put the results. Values in reg_lo and
368 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
369 // registers, those above refer to 4-byte stack slots. All stack slots are
370 // based off of the window top. SharedInfo::stack0 refers to the first usable
371 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
372 // 4-bytes higher. So for sparc because the register window save area is at
373 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
374 // will be just above it. (
375 // return value is the maximum number of VMReg stack slots the convention will use.
376 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
377 static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
378 static const uint java_return_convention_max_int;
379 static const uint java_return_convention_max_float;
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 static size_t trampoline_size();
397
398 static void generate_trampoline(MacroAssembler *masm, address destination);
399
400 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
401 // blobs. Unlike adapters in the tiger and earlier releases the code in these
402 // blobs does not create a new frame and are therefore virtually invisible
403 // to the stack walking code. In general these blobs extend the callers stack
404 // as needed for the conversion of argument locations.
405
406 // When calling a c2i blob the code will always call the interpreter even if
407 // by the time we reach the blob there is compiled code available. This allows
408 // the blob to pass the incoming stack pointer (the sender sp) in a known
409 // location for the interpreter to record. This is used by the frame code
410 // to correct the sender code to match up with the stack pointer when the
411 // thread left the compiled code. In addition it allows the interpreter
412 // to remove the space the c2i adapter allocated to do its argument conversion.
413
414 // Although a c2i blob will always run interpreted even if compiled code is
415 // present if we see that compiled code is present the compiled call site
416 // will be patched/re-resolved so that later calls will run compiled.
417
418 // Additionally a c2i blob need to have a unverified entry because it can be reached
419 // in situations where the call site is an inlined cache site and may go megamorphic.
420
421 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
422 // that the interpreter before it does any call dispatch will record the current
423 // stack pointer in the interpreter frame. On return it will restore the stack
424 // pointer as needed. This means the i2c adapter code doesn't need any special
425 // handshaking path with compiled code to keep the stack walking correct.
426
427 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm,
428 int comp_args_on_stack,
429 const GrowableArray<SigEntry>& sig_extended,
430 const VMRegPair *regs,
431 AdapterFingerPrint* fingerprint,
432 AdapterBlob*& new_adapter);
433
434 static void gen_i2c_adapter(MacroAssembler *_masm,
435 int comp_args_on_stack,
436 const GrowableArray<SigEntry>& sig_extended,
437 const VMRegPair *regs);
438
439 // OSR support
440
441 // OSR_migration_begin will extract the jvm state from an interpreter
442 // frame (locals, monitors) and store the data in a piece of C heap
443 // storage. This then allows the interpreter frame to be removed from the
444 // stack and the OSR nmethod to be called. That method is called with a
445 // pointer to the C heap storage. This pointer is the return value from
446 // OSR_migration_begin.
447
448 static intptr_t* OSR_migration_begin(JavaThread *thread);
449
450 // OSR_migration_end is a trivial routine. It is called after the compiled
451 // method has extracted the jvm state from the C heap that OSR_migration_begin
452 // created. It's entire job is to simply free this storage.
453 static void OSR_migration_end(intptr_t* buf);
454
455 // Convert a sig into a calling convention register layout
456 // and find interesting things about it.
457 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
458 static VMReg name_for_receiver();
459
460 // "Top of Stack" slots that may be unused by the calling convention but must
461 // otherwise be preserved.
462 // On Intel these are not necessary and the value can be zero.
463 // On Sparc this describes the words reserved for storing a register window
464 // when an interrupt occurs.
465 static uint out_preserve_stack_slots();
466
467 // Is vector's size (in bytes) bigger than a size saved by default?
468 // For example, on x86 16 bytes XMM registers are saved by default.
469 static bool is_wide_vector(int size);
470
471 // Save and restore a native result
472 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
473 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
474
475 // Generate a native wrapper for a given method. The method takes arguments
476 // in the Java compiled code convention, marshals them to the native
477 // convention (handlizes oops, etc), transitions to native, makes the call,
478 // returns to java state (possibly blocking), unhandlizes any result and
479 // returns.
480 //
481 // The wrapper may contain special-case code if the given method
482 // is a JNI critical method, or a compiled method handle adapter,
483 // such as _invokeBasic, _linkToVirtual, etc.
484 static nmethod* generate_native_wrapper(MacroAssembler* masm,
485 const methodHandle& method,
486 int compile_id,
487 BasicType* sig_bt,
488 VMRegPair* regs,
489 BasicType ret_type);
490
491 // Block before entering a JNI critical method
492 static void block_for_jni_critical(JavaThread* thread);
493
494 // A compiled caller has just called the interpreter, but compiled code
495 // exists. Patch the caller so he no longer calls into the interpreter.
496 static void fixup_callers_callsite(Method* moop, address ret_pc);
497 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
498
499 // Slow-path Locking and Unlocking
500 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
501 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
502
503 // Resolving of calls
504 static address resolve_static_call_C (JavaThread *thread);
505 static address resolve_virtual_call_C (JavaThread *thread);
506 static address resolve_opt_virtual_call_C(JavaThread *thread);
507
508 static void load_value_type_fields_in_regs(JavaThread *thread, oopDesc* res);
509 static void store_value_type_fields_to_buf(JavaThread *thread, intptr_t res);
510
511 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
512 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
513 oopDesc* dest, jint dest_pos,
514 jint length, JavaThread* thread);
515
516 // handle ic miss with caller being compiled code
517 // wrong method handling (inline cache misses, zombie methods)
518 static address handle_wrong_method(JavaThread* thread);
519 static address handle_wrong_method_abstract(JavaThread* thread);
520 static address handle_wrong_method_ic_miss(JavaThread* thread);
521 static void allocate_value_types(JavaThread* thread, Method* callee);
522 static void apply_post_barriers(JavaThread* thread, objArrayOopDesc* array);
523
524 static address handle_unsafe_access(JavaThread* thread, address next_pc);
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 Symbol* _sig_extended;
642
643 #ifdef ASSERT
644 // Captures code and signature used to generate this adapter when
645 // verifying adapter equivalence.
646 unsigned char* _saved_code;
647 int _saved_code_length;
648 #endif
649
650 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, Symbol* sig_extended) {
651 _fingerprint = fingerprint;
652 _i2c_entry = i2c_entry;
653 _c2i_entry = c2i_entry;
654 _c2i_unverified_entry = c2i_unverified_entry;
655 _sig_extended = sig_extended;
656 #ifdef ASSERT
657 _saved_code = NULL;
658 _saved_code_length = 0;
659 #endif
660 }
661
662 void deallocate();
663
664 // should never be used
665 AdapterHandlerEntry();
666
667 public:
668 address get_i2c_entry() const { return _i2c_entry; }
669 address get_c2i_entry() const { return _c2i_entry; }
670 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
671 Symbol* get_sig_extended() const { return _sig_extended; }
672 address base_address();
673 void relocate(address new_base);
674
675 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
676
677 AdapterHandlerEntry* next() {
678 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
679 }
680
681 #ifdef ASSERT
682 // Used to verify that code generated for shared adapters is equivalent
683 void save_code (unsigned char* code, int length);
684 bool compare_code(unsigned char* code, int length);
685 #endif
686
687 //virtual void print_on(outputStream* st) const; DO NOT USE
688 void print_adapter_on(outputStream* st) const;
689 };
690
691 // This class is used only with DumpSharedSpaces==true. It holds extra information
692 // that's used only during CDS dump time.
693 // For details, see comments around Method::link_method()
694 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
695 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region
696 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region
697
698 public:
699 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; }
700 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
701 void init() NOT_CDS_RETURN;
702 };
703
704
705 class AdapterHandlerLibrary: public AllStatic {
706 private:
707 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
708 static AdapterHandlerTable* _adapters;
709 static AdapterHandlerEntry* _abstract_method_handler;
710 static BufferBlob* buffer_blob();
711 static void initialize();
712 static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
713
714 public:
715
716 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
717 address i2c_entry, address c2i_entry, address c2i_unverified_entry,
718 Symbol* sig_extended = NULL);
719 static void create_native_wrapper(const methodHandle& method);
720 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
721
722 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
723 static void print_handler_on(outputStream* st, const CodeBlob* b);
724 static bool contains(const CodeBlob* b);
725 #ifndef PRODUCT
726 static void print_statistics();
727 #endif // PRODUCT
728
729 };
730
731 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP