1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
27
28 #include "interpreter/bytecodeHistogram.hpp"
29 #include "interpreter/bytecodeTracer.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "utilities/hashtable.hpp"
34 #include "utilities/macros.hpp"
35
36 class AdapterHandlerEntry;
37 class AdapterHandlerTable;
38 class AdapterFingerPrint;
39 class vframeStream;
40 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 // exception handling and implicit exceptions
187 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
188 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
189 enum ImplicitExceptionKind {
190 IMPLICIT_NULL,
191 IMPLICIT_DIVIDE_BY_ZERO,
192 STACK_OVERFLOW
193 };
194 static void throw_AbstractMethodError(JavaThread* thread);
195 static void throw_IncompatibleClassChangeError(JavaThread* thread);
196 static void throw_ArithmeticException(JavaThread* thread);
197 static void throw_NullPointerException(JavaThread* thread);
198 static void throw_NullPointerException_at_call(JavaThread* thread);
199 static void throw_StackOverflowError(JavaThread* thread);
200 static void throw_delayed_StackOverflowError(JavaThread* thread);
201 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed);
202 static address continuation_for_implicit_exception(JavaThread* thread,
203 address faulting_pc,
204 ImplicitExceptionKind exception_kind);
205 #if INCLUDE_JVMCI
206 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason);
207 #endif
208
209 // Post-slow-path-allocation, pre-initializing-stores step for
210 // implementing e.g. ReduceInitialCardMarks
211 static void on_slowpath_allocation_exit(JavaThread* thread);
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 static oop retrieve_receiver(Symbol* sig, frame caller);
273
274 static void register_finalizer(JavaThread* thread, oopDesc* obj);
275
276 // dtrace notifications
277 static int dtrace_object_alloc(oopDesc* o, int size);
278 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
279 static int dtrace_method_entry(JavaThread* thread, Method* m);
280 static int dtrace_method_exit(JavaThread* thread, Method* m);
281
282 // Utility method for retrieving the Java thread id, returns 0 if the
283 // thread is not a well formed Java thread.
284 static jlong get_java_tid(Thread* thread);
285
286
287 // used by native wrappers to reenable yellow if overflow happened in native code
288 static void reguard_yellow_pages();
289
290 // Fill in the "X cannot be cast to a Y" message for ClassCastException
291 //
292 // @param thr the current thread
293 // @param caster_klass the class of the object we are casting
294 // @return the dynamically allocated exception message (must be freed
295 // by the caller using a resource mark)
296 //
297 // BCP must refer to the current 'checkcast' opcode for the frame
298 // on top of the stack.
299 // The caller (or one of its callers) must use a ResourceMark
300 // in order to correctly free the result.
301 //
302 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
303
304 // Fill in the "X cannot be cast to a Y" message for ClassCastException
305 //
306 // @param caster_klass the class of the object we are casting
307 // @param target_klass the target klass attempt
308 // @return the dynamically allocated exception message (must be freed
309 // by the caller using a resource mark)
310 //
311 // This version does not require access the frame, so it can be called
312 // from interpreted code
313 // The caller (or one of it's callers) must use a ResourceMark
314 // in order to correctly free the result.
315 //
316 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);
317
318 // Resolves a call site- may patch in the destination of the call into the
319 // compiled code.
320 static methodHandle resolve_helper(JavaThread *thread,
321 bool is_virtual,
322 bool is_optimized, TRAPS);
323
324 private:
325 // deopt blob
326 static void generate_deopt_blob(void);
327
328 public:
329 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
330
331 // Resets a call-site in compiled code so it will get resolved again.
332 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
333
334 // In the code prolog, if the klass comparison fails, the inline cache
335 // misses and the call site is patched to megamorphic
336 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
337
338 // Find the method that called us.
339 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
340
341
342 private:
343 static Handle find_callee_info(JavaThread* thread,
344 Bytecodes::Code& bc,
345 CallInfo& callinfo, TRAPS);
346 static Handle find_callee_info_helper(JavaThread* thread,
347 vframeStream& vfst,
348 Bytecodes::Code& bc,
349 CallInfo& callinfo, TRAPS);
350
351 static methodHandle extract_attached_method(vframeStream& vfst);
352
353 static address clean_virtual_call_entry();
354 static address clean_opt_virtual_call_entry();
355 static address clean_static_call_entry();
356
357 #if defined(X86) && defined(COMPILER1)
358 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
359 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
360 #endif // X86 && COMPILER1
361
362 public:
363
364 // Read the array of BasicTypes from a Java signature, and compute where
365 // compiled Java code would like to put the results. Values in reg_lo and
366 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
367 // registers, those above refer to 4-byte stack slots. All stack slots are
368 // based off of the window top. SharedInfo::stack0 refers to the first usable
369 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
370 // 4-bytes higher. So for sparc because the register window save area is at
371 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
372 // will be just above it. (
373 // return value is the maximum number of VMReg stack slots the convention will use.
374 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
375 static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
376 static const uint java_return_convention_max_int;
377 static const uint java_return_convention_max_float;
378
379 static void check_member_name_argument_is_last_argument(const methodHandle& method,
380 const BasicType* sig_bt,
381 const VMRegPair* regs) NOT_DEBUG_RETURN;
382
383 // Ditto except for calling C
384 //
385 // C argument in register AND stack slot.
386 // Some architectures require that an argument must be passed in a register
387 // AND in a stack slot. These architectures provide a second VMRegPair array
388 // to be filled by the c_calling_convention method. On other architectures,
389 // NULL is being passed as the second VMRegPair array, so arguments are either
390 // passed in a register OR in a stack slot.
391 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
392 int total_args_passed);
393
394 static size_t trampoline_size();
395
396 static void generate_trampoline(MacroAssembler *masm, address destination);
397
398 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
399 // blobs. Unlike adapters in the tiger and earlier releases the code in these
400 // blobs does not create a new frame and are therefore virtually invisible
401 // to the stack walking code. In general these blobs extend the callers stack
402 // as needed for the conversion of argument locations.
403
404 // When calling a c2i blob the code will always call the interpreter even if
405 // by the time we reach the blob there is compiled code available. This allows
406 // the blob to pass the incoming stack pointer (the sender sp) in a known
407 // location for the interpreter to record. This is used by the frame code
408 // to correct the sender code to match up with the stack pointer when the
409 // thread left the compiled code. In addition it allows the interpreter
410 // to remove the space the c2i adapter allocated to do its argument conversion.
411
412 // Although a c2i blob will always run interpreted even if compiled code is
413 // present if we see that compiled code is present the compiled call site
414 // will be patched/re-resolved so that later calls will run compiled.
415
416 // Additionally a c2i blob need to have a unverified entry because it can be reached
417 // in situations where the call site is an inlined cache site and may go megamorphic.
418
419 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
420 // that the interpreter before it does any call dispatch will record the current
421 // stack pointer in the interpreter frame. On return it will restore the stack
422 // pointer as needed. This means the i2c adapter code doesn't need any special
423 // handshaking path with compiled code to keep the stack walking correct.
424
425 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm,
426 int comp_args_on_stack,
427 const GrowableArray<SigEntry>& sig_extended,
428 const VMRegPair *regs,
429 AdapterFingerPrint* fingerprint,
430 AdapterBlob*& new_adapter);
431
432 static void gen_i2c_adapter(MacroAssembler *_masm,
433 int comp_args_on_stack,
434 const GrowableArray<SigEntry>& sig_extended,
435 const VMRegPair *regs);
436
437 // OSR support
438
439 // OSR_migration_begin will extract the jvm state from an interpreter
440 // frame (locals, monitors) and store the data in a piece of C heap
441 // storage. This then allows the interpreter frame to be removed from the
442 // stack and the OSR nmethod to be called. That method is called with a
443 // pointer to the C heap storage. This pointer is the return value from
444 // OSR_migration_begin.
445
446 static intptr_t* OSR_migration_begin(JavaThread *thread);
447
448 // OSR_migration_end is a trivial routine. It is called after the compiled
449 // method has extracted the jvm state from the C heap that OSR_migration_begin
450 // created. It's entire job is to simply free this storage.
451 static void OSR_migration_end(intptr_t* buf);
452
453 // Convert a sig into a calling convention register layout
454 // and find interesting things about it.
455 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
456 static VMReg name_for_receiver();
457
458 // "Top of Stack" slots that may be unused by the calling convention but must
459 // otherwise be preserved.
460 // On Intel these are not necessary and the value can be zero.
461 // On Sparc this describes the words reserved for storing a register window
462 // when an interrupt occurs.
463 static uint out_preserve_stack_slots();
464
465 // Is vector's size (in bytes) bigger than a size saved by default?
466 // For example, on x86 16 bytes XMM registers are saved by default.
467 static bool is_wide_vector(int size);
468
469 // Save and restore a native result
470 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
471 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
472
473 // Generate a native wrapper for a given method. The method takes arguments
474 // in the Java compiled code convention, marshals them to the native
475 // convention (handlizes oops, etc), transitions to native, makes the call,
476 // returns to java state (possibly blocking), unhandlizes any result and
477 // returns.
478 //
479 // The wrapper may contain special-case code if the given method
480 // is a JNI critical method, or a compiled method handle adapter,
481 // such as _invokeBasic, _linkToVirtual, etc.
482 static nmethod* generate_native_wrapper(MacroAssembler* masm,
483 const methodHandle& method,
484 int compile_id,
485 BasicType* sig_bt,
486 VMRegPair* regs,
487 BasicType ret_type);
488
489 // Block before entering a JNI critical method
490 static void block_for_jni_critical(JavaThread* thread);
491
492 // Pin/Unpin object
493 static oopDesc* pin_object(JavaThread* thread, oopDesc* obj);
494 static void unpin_object(JavaThread* thread, oopDesc* obj);
495
496 // A compiled caller has just called the interpreter, but compiled code
497 // exists. Patch the caller so he no longer calls into the interpreter.
498 static void fixup_callers_callsite(Method* moop, address ret_pc);
499 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
500
501 // Slow-path Locking and Unlocking
502 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
503 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
504
505 // Resolving of calls
506 static address resolve_static_call_C (JavaThread *thread);
507 static address resolve_virtual_call_C (JavaThread *thread);
508 static address resolve_opt_virtual_call_C(JavaThread *thread);
509
510 static void load_value_type_fields_in_regs(JavaThread *thread, oopDesc* res);
511 static void store_value_type_fields_to_buf(JavaThread *thread, intptr_t res);
512
513 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
514 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
515 oopDesc* dest, jint dest_pos,
516 jint length, JavaThread* thread);
517
518 // handle ic miss with caller being compiled code
519 // wrong method handling (inline cache misses, zombie methods)
520 static address handle_wrong_method(JavaThread* thread);
521 static address handle_wrong_method_abstract(JavaThread* thread);
522 static address handle_wrong_method_ic_miss(JavaThread* thread);
523 static void allocate_value_types(JavaThread* thread, Method* callee);
524 static void apply_post_barriers(JavaThread* thread, objArrayOopDesc* array);
525
526 static address handle_unsafe_access(JavaThread* thread, address next_pc);
527
528 static BufferedValueTypeBlob* generate_buffered_value_type_adapter(const ValueKlass* vk);
529 #ifndef PRODUCT
530
531 // Collect and print inline cache miss statistics
532 private:
533 enum { maxICmiss_count = 100 };
534 static int _ICmiss_index; // length of IC miss histogram
535 static int _ICmiss_count[maxICmiss_count]; // miss counts
536 static address _ICmiss_at[maxICmiss_count]; // miss addresses
537 static void trace_ic_miss(address at);
538
539 public:
540 static int _throw_null_ctr; // throwing a null-pointer exception
541 static int _ic_miss_ctr; // total # of IC misses
542 static int _wrong_method_ctr;
543 static int _resolve_static_ctr;
544 static int _resolve_virtual_ctr;
545 static int _resolve_opt_virtual_ctr;
546 static int _implicit_null_throws;
547 static int _implicit_div0_throws;
548
549 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
550 static int _jshort_array_copy_ctr; // Slow-path short array copy
551 static int _jint_array_copy_ctr; // Slow-path int array copy
552 static int _jlong_array_copy_ctr; // Slow-path long array copy
553 static int _oop_array_copy_ctr; // Slow-path oop array copy
554 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
555 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
556 static int _generic_array_copy_ctr; // Slow-path includes type decoding
557 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
558
559 static int _new_instance_ctr; // 'new' object requires GC
560 static int _new_array_ctr; // 'new' array requires GC
561 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
562 static int _find_handler_ctr; // find exception handler
563 static int _rethrow_ctr; // rethrow exception
564 static int _mon_enter_stub_ctr; // monitor enter stub
565 static int _mon_exit_stub_ctr; // monitor exit stub
566 static int _mon_enter_ctr; // monitor enter slow
567 static int _mon_exit_ctr; // monitor exit slow
568 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
569
570 // Statistics code
571 // stats for "normal" compiled calls (non-interface)
572 static int _nof_normal_calls; // total # of calls
573 static int _nof_optimized_calls; // total # of statically-bound calls
574 static int _nof_inlined_calls; // total # of inlined normal calls
575 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
576 static int _nof_inlined_static_calls; // total # of inlined static calls
577 // stats for compiled interface calls
578 static int _nof_interface_calls; // total # of compiled calls
579 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
580 static int _nof_inlined_interface_calls; // total # of inlined interface calls
581 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
582 // stats for runtime exceptions
583 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
584
585 public: // for compiler
586 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
587 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
588 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
589 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
590 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
591 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
592 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
593 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
594 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
595 static void print_call_statistics(int comp_total);
596 static void print_statistics();
597 static void print_ic_miss_histogram();
598
599 #endif // PRODUCT
600 };
601
602
603 // ---------------------------------------------------------------------------
604 // Implementation of AdapterHandlerLibrary
605 //
606 // This library manages argument marshaling adapters and native wrappers.
607 // There are 2 flavors of adapters: I2C and C2I.
608 //
609 // The I2C flavor takes a stock interpreted call setup, marshals the
610 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
611 // code_begin(). It is broken to call it without an nmethod assigned.
612 // The usual behavior is to lift any register arguments up out of the
613 // stack and possibly re-pack the extra arguments to be contiguous.
614 // I2C adapters will save what the interpreter's stack pointer will be
615 // after arguments are popped, then adjust the interpreter's frame
616 // size to force alignment and possibly to repack the arguments.
617 // After re-packing, it jumps to the compiled code start. There are
618 // no safepoints in this adapter code and a GC cannot happen while
619 // marshaling is in progress.
620 //
621 // The C2I flavor takes a stock compiled call setup plus the target method in
622 // Rmethod, marshals the arguments for an interpreted call and jumps to
623 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
624 // setup. Compiled frames are fixed-size and the args are likely not in the
625 // right place. Hence all the args will likely be copied into the
626 // interpreter's frame, forcing that frame to grow. The compiled frame's
627 // outgoing stack args will be dead after the copy.
628 //
629 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
630 // also perform an official frame push & pop. They have a call to the native
631 // routine in their middles and end in a return (instead of ending in a jump).
632 // The native wrappers are stored in real nmethods instead of the BufferBlobs
633 // used by the adapters. The code generation happens here because it's very
634 // similar to what the adapters have to do.
635
636 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
637 friend class AdapterHandlerTable;
638
639 private:
640 AdapterFingerPrint* _fingerprint;
641 address _i2c_entry;
642 address _c2i_entry;
643 address _c2i_unverified_entry;
644 Symbol* _sig_extended;
645
646 #ifdef ASSERT
647 // Captures code and signature used to generate this adapter when
648 // verifying adapter equivalence.
649 unsigned char* _saved_code;
650 int _saved_code_length;
651 #endif
652
653 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, Symbol* sig_extended) {
654 _fingerprint = fingerprint;
655 _i2c_entry = i2c_entry;
656 _c2i_entry = c2i_entry;
657 _c2i_unverified_entry = c2i_unverified_entry;
658 _sig_extended = sig_extended;
659 #ifdef ASSERT
660 _saved_code = NULL;
661 _saved_code_length = 0;
662 #endif
663 }
664
665 void deallocate();
666
667 // should never be used
668 AdapterHandlerEntry();
669
670 public:
671 address get_i2c_entry() const { return _i2c_entry; }
672 address get_c2i_entry() const { return _c2i_entry; }
673 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
674 Symbol* get_sig_extended() const { return _sig_extended; }
675 address base_address();
676 void relocate(address new_base);
677
678 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
679
680 AdapterHandlerEntry* next() {
681 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
682 }
683
684 #ifdef ASSERT
685 // Used to verify that code generated for shared adapters is equivalent
686 void save_code (unsigned char* code, int length);
687 bool compare_code(unsigned char* code, int length);
688 #endif
689
690 //virtual void print_on(outputStream* st) const; DO NOT USE
691 void print_adapter_on(outputStream* st) const;
692 };
693
694 // This class is used only with DumpSharedSpaces==true. It holds extra information
695 // that's used only during CDS dump time.
696 // For details, see comments around Method::link_method()
697 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
698 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region
699 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region
700
701 public:
702 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; }
703 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
704 void init() NOT_CDS_RETURN;
705 };
706
707
708 class AdapterHandlerLibrary: public AllStatic {
709 private:
710 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
711 static AdapterHandlerTable* _adapters;
712 static AdapterHandlerEntry* _abstract_method_handler;
713 static BufferBlob* buffer_blob();
714 static void initialize();
715 static AdapterHandlerEntry* get_adapter0(const methodHandle& method, TRAPS);
716
717 public:
718
719 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
720 address i2c_entry, address c2i_entry, address c2i_unverified_entry,
721 Symbol* sig_extended = NULL);
722 static void create_native_wrapper(const methodHandle& method);
723 static AdapterHandlerEntry* get_adapter(const methodHandle& method, TRAPS);
724
725 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
726 static void print_handler_on(outputStream* st, const CodeBlob* b);
727 static bool contains(const CodeBlob* b);
728 #ifndef PRODUCT
729 static void print_statistics();
730 #endif // PRODUCT
731
732 };
733
734 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP