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
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 static address _resolve_static_call_entry;
64
65 static DeoptimizationBlob* _deopt_blob;
66
67 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
68 static SafepointBlob* _polling_page_safepoint_handler_blob;
69 static SafepointBlob* _polling_page_return_handler_blob;
70
71 #ifdef COMPILER2
72 static UncommonTrapBlob* _uncommon_trap_blob;
73 #endif // COMPILER2
74
75 #ifndef PRODUCT
76 // Counters
77 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
78 #endif // !PRODUCT
79
80 private:
81 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
82 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
83 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
84
85 public:
86 static void generate_stubs(void);
87
88 // max bytes for each dtrace string parameter
89 enum { max_dtrace_string_size = 256 };
90
91 // The following arithmetic routines are used on platforms that do
92 // not have machine instructions to implement their functionality.
93 // Do not remove these.
94
95 // long arithmetics
96 static jlong lmul(jlong y, jlong x);
97 static jlong ldiv(jlong y, jlong x);
98 static jlong lrem(jlong y, jlong x);
99
100 // float and double remainder
101 static jfloat frem(jfloat x, jfloat y);
102 static jdouble drem(jdouble x, jdouble y);
103
104
105 #ifdef _WIN64
106 // Workaround for fmod issue in the Windows x64 CRT
107 static double fmod_winx64(double x, double y);
108 #endif
109
110 #ifdef __SOFTFP__
111 static jfloat fadd(jfloat x, jfloat y);
112 static jfloat fsub(jfloat x, jfloat y);
113 static jfloat fmul(jfloat x, jfloat y);
114 static jfloat fdiv(jfloat x, jfloat y);
115
116 static jdouble dadd(jdouble x, jdouble y);
117 static jdouble dsub(jdouble x, jdouble y);
118 static jdouble dmul(jdouble x, jdouble y);
119 static jdouble ddiv(jdouble x, jdouble y);
120 #endif // __SOFTFP__
121
122 // float conversion (needs to set appropriate rounding mode)
123 static jint f2i (jfloat x);
124 static jlong f2l (jfloat x);
125 static jint d2i (jdouble x);
126 static jlong d2l (jdouble x);
127 static jfloat d2f (jdouble x);
128 static jfloat l2f (jlong x);
129 static jdouble l2d (jlong x);
130
131 #ifdef __SOFTFP__
132 static jfloat i2f (jint x);
133 static jdouble i2d (jint x);
134 static jdouble f2d (jfloat x);
135 #endif // __SOFTFP__
136
137 // double trigonometrics and transcendentals
138 static jdouble dsin(jdouble x);
139 static jdouble dcos(jdouble x);
140 static jdouble dtan(jdouble x);
141 static jdouble dlog(jdouble x);
142 static jdouble dlog10(jdouble x);
143 static jdouble dexp(jdouble x);
144 static jdouble dpow(jdouble x, jdouble y);
145
146 #if defined(__SOFTFP__) || defined(E500V2)
147 static double dabs(double f);
148 #endif
149
150 #if defined(__SOFTFP__) || defined(PPC)
151 static double dsqrt(double f);
152 #endif
153
154 // Montgomery multiplication
155 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
156 jint len, jlong inv, jint *m_ints);
157 static void montgomery_square(jint *a_ints, jint *n_ints,
158 jint len, jlong inv, jint *m_ints);
159
160 #ifdef __SOFTFP__
161 // C++ compiler generates soft float instructions as well as passing
162 // float and double in registers.
163 static int fcmpl(float x, float y);
164 static int fcmpg(float x, float y);
165 static int dcmpl(double x, double y);
166 static int dcmpg(double x, double y);
167
168 static int unordered_fcmplt(float x, float y);
169 static int unordered_dcmplt(double x, double y);
170 static int unordered_fcmple(float x, float y);
171 static int unordered_dcmple(double x, double y);
172 static int unordered_fcmpge(float x, float y);
173 static int unordered_dcmpge(double x, double y);
174 static int unordered_fcmpgt(float x, float y);
175 static int unordered_dcmpgt(double x, double y);
176
177 static float fneg(float f);
178 static double dneg(double f);
179 #endif
180
181 // exception handling across interpreter/compiler boundaries
182 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
183 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
184
185 #if INCLUDE_G1GC
186 // G1 write barriers
187 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
188 static void g1_wb_post(void* card_addr, JavaThread* thread);
189 #endif // INCLUDE_G1GC
190
191 // exception handling and implicit exceptions
192 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
193 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
194 enum ImplicitExceptionKind {
195 IMPLICIT_NULL,
196 IMPLICIT_DIVIDE_BY_ZERO,
197 STACK_OVERFLOW
198 };
199 static void throw_AbstractMethodError(JavaThread* thread);
200 static void throw_IncompatibleClassChangeError(JavaThread* thread);
201 static void throw_ArithmeticException(JavaThread* thread);
202 static void throw_NullPointerException(JavaThread* thread);
203 static void throw_NullPointerException_at_call(JavaThread* thread);
204 static void throw_StackOverflowError(JavaThread* thread);
205 static void throw_delayed_StackOverflowError(JavaThread* thread);
206 static void throw_StackOverflowError_common(JavaThread* thread, bool delayed);
207 static address continuation_for_implicit_exception(JavaThread* thread,
208 address faulting_pc,
209 ImplicitExceptionKind exception_kind);
210 #if INCLUDE_JVMCI
211 static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason);
212 #endif
213
214 // Post-slow-path-allocation, pre-initializing-stores step for
215 // implementing e.g. ReduceInitialCardMarks
216 static void on_slowpath_allocation_exit(JavaThread* thread);
217
218 static void enable_stack_reserved_zone(JavaThread* thread);
219 static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);
220
221 // Shared stub locations
222 static address get_poll_stub(address pc);
223
224 static address get_ic_miss_stub() {
225 assert(_ic_miss_blob!= NULL, "oops");
226 return _ic_miss_blob->entry_point();
227 }
228
229 static address get_handle_wrong_method_stub() {
230 assert(_wrong_method_blob!= NULL, "oops");
231 return _wrong_method_blob->entry_point();
232 }
233
234 static address get_handle_wrong_method_abstract_stub() {
235 assert(_wrong_method_abstract_blob!= NULL, "oops");
236 return _wrong_method_abstract_blob->entry_point();
237 }
238
239 #ifdef COMPILER2
240 static void generate_uncommon_trap_blob(void);
241 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
242 #endif // COMPILER2
243
244 static address get_resolve_opt_virtual_call_stub() {
245 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
246 return _resolve_opt_virtual_call_blob->entry_point();
247 }
248 static address get_resolve_virtual_call_stub() {
249 assert(_resolve_virtual_call_blob != NULL, "oops");
250 return _resolve_virtual_call_blob->entry_point();
251 }
252 static address get_resolve_static_call_stub() {
253 assert(_resolve_static_call_blob != NULL, "oops");
254 return _resolve_static_call_blob->entry_point();
255 }
256
257 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
258 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
259 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
260
261 // Counters
262 #ifndef PRODUCT
263 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
264 #endif // PRODUCT
265
266 // Helper routine for full-speed JVMTI exception throwing support
267 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
268 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
269
270 // RedefineClasses() tracing support for obsolete method entry
271 static int rc_trace_method_entry(JavaThread* thread, Method* m);
272
273 // To be used as the entry point for unresolved native methods.
274 static address native_method_throw_unsatisfied_link_error_entry();
275 static address native_method_throw_unsupported_operation_exception_entry();
276
277 static oop retrieve_receiver(Symbol* sig, frame caller);
278
279 static void register_finalizer(JavaThread* thread, oopDesc* obj);
280
281 // dtrace notifications
282 static int dtrace_object_alloc(oopDesc* o, int size);
283 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
284 static int dtrace_method_entry(JavaThread* thread, Method* m);
285 static int dtrace_method_exit(JavaThread* thread, Method* m);
286
287 // Utility method for retrieving the Java thread id, returns 0 if the
288 // thread is not a well formed Java thread.
289 static jlong get_java_tid(Thread* thread);
290
291
292 // used by native wrappers to reenable yellow if overflow happened in native code
293 static void reguard_yellow_pages();
294
295 // Fill in the "X cannot be cast to a Y" message for ClassCastException
296 //
297 // @param thr the current thread
298 // @param caster_klass the class of the object we are casting
299 // @return the dynamically allocated exception message (must be freed
300 // by the caller using a resource mark)
301 //
302 // BCP must refer to the current 'checkcast' opcode for the frame
303 // on top of the stack.
304 // The caller (or one of its callers) must use a ResourceMark
305 // in order to correctly free the result.
306 //
307 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
308
309 // Fill in the "X cannot be cast to a Y" message for ClassCastException
310 //
311 // @param caster_klass the class of the object we are casting
312 // @param target_klass the target klass attempt
313 // @return the dynamically allocated exception message (must be freed
314 // by the caller using a resource mark)
315 //
316 // This version does not require access the frame, so it can be called
317 // from interpreted code
318 // The caller (or one of it's callers) must use a ResourceMark
319 // in order to correctly free the result.
320 //
321 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);
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, const 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 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 total_args_passed,
429 int max_arg,
430 const BasicType *sig_bt,
431 const VMRegPair *regs,
432 AdapterFingerPrint* fingerprint);
433
434 static void gen_i2c_adapter(MacroAssembler *_masm,
435 int total_args_passed,
436 int comp_args_on_stack,
437 const BasicType *sig_bt,
438 const VMRegPair *regs);
439
440 // OSR support
441
442 // OSR_migration_begin will extract the jvm state from an interpreter
443 // frame (locals, monitors) and store the data in a piece of C heap
444 // storage. This then allows the interpreter frame to be removed from the
445 // stack and the OSR nmethod to be called. That method is called with a
446 // pointer to the C heap storage. This pointer is the return value from
447 // OSR_migration_begin.
448
449 static intptr_t* OSR_migration_begin(JavaThread *thread);
450
451 // OSR_migration_end is a trivial routine. It is called after the compiled
452 // method has extracted the jvm state from the C heap that OSR_migration_begin
453 // created. It's entire job is to simply free this storage.
454 static void OSR_migration_end(intptr_t* buf);
455
456 // Convert a sig into a calling convention register layout
457 // and find interesting things about it.
458 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
459 static VMReg name_for_receiver();
460
461 // "Top of Stack" slots that may be unused by the calling convention but must
462 // otherwise be preserved.
463 // On Intel these are not necessary and the value can be zero.
464 // On Sparc this describes the words reserved for storing a register window
465 // when an interrupt occurs.
466 static uint out_preserve_stack_slots();
467
468 // Is vector's size (in bytes) bigger than a size saved by default?
469 // For example, on x86 16 bytes XMM registers are saved by default.
470 static bool is_wide_vector(int size);
471
472 // Save and restore a native result
473 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
474 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
475
476 // Generate a native wrapper for a given method. The method takes arguments
477 // in the Java compiled code convention, marshals them to the native
478 // convention (handlizes oops, etc), transitions to native, makes the call,
479 // returns to java state (possibly blocking), unhandlizes any result and
480 // returns.
481 //
482 // The wrapper may contain special-case code if the given method
483 // is a JNI critical method, or a compiled method handle adapter,
484 // such as _invokeBasic, _linkToVirtual, etc.
485 static nmethod* generate_native_wrapper(MacroAssembler* masm,
486 const methodHandle& method,
487 int compile_id,
488 BasicType* sig_bt,
489 VMRegPair* regs,
490 BasicType ret_type);
491
492 // Block before entering a JNI critical method
493 static void block_for_jni_critical(JavaThread* thread);
494
495 // A compiled caller has just called the interpreter, but compiled code
496 // exists. Patch the caller so he no longer calls into the interpreter.
497 static void fixup_callers_callsite(Method* moop, address ret_pc);
498 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
499
500 // Slow-path Locking and Unlocking
501 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
502 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
503
504 // Resolving of calls
505 static address resolve_static_call_C (JavaThread *thread);
506 static address resolve_virtual_call_C (JavaThread *thread);
507 static address resolve_opt_virtual_call_C(JavaThread *thread);
508
509 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
510 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
511 oopDesc* dest, jint dest_pos,
512 jint length, JavaThread* thread);
513
514 // handle ic miss with caller being compiled code
515 // wrong method handling (inline cache misses, zombie methods)
516 static address handle_wrong_method(JavaThread* thread);
517 static address handle_wrong_method_abstract(JavaThread* thread);
518 static address handle_wrong_method_ic_miss(JavaThread* thread);
519
520 static address handle_unsafe_access(JavaThread* thread, address next_pc);
521
522 #ifndef PRODUCT
523
524 // Collect and print inline cache miss statistics
525 private:
526 enum { maxICmiss_count = 100 };
527 static int _ICmiss_index; // length of IC miss histogram
528 static int _ICmiss_count[maxICmiss_count]; // miss counts
529 static address _ICmiss_at[maxICmiss_count]; // miss addresses
530 static void trace_ic_miss(address at);
531
532 public:
533 static int _throw_null_ctr; // throwing a null-pointer exception
534 static int _ic_miss_ctr; // total # of IC misses
535 static int _wrong_method_ctr;
536 static int _resolve_static_ctr;
537 static int _resolve_virtual_ctr;
538 static int _resolve_opt_virtual_ctr;
539 static int _implicit_null_throws;
540 static int _implicit_div0_throws;
541
542 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
543 static int _jshort_array_copy_ctr; // Slow-path short array copy
544 static int _jint_array_copy_ctr; // Slow-path int array copy
545 static int _jlong_array_copy_ctr; // Slow-path long array copy
546 static int _oop_array_copy_ctr; // Slow-path oop array copy
547 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
548 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
549 static int _generic_array_copy_ctr; // Slow-path includes type decoding
550 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
551
552 static int _new_instance_ctr; // 'new' object requires GC
553 static int _new_array_ctr; // 'new' array requires GC
554 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
555 static int _find_handler_ctr; // find exception handler
556 static int _rethrow_ctr; // rethrow exception
557 static int _mon_enter_stub_ctr; // monitor enter stub
558 static int _mon_exit_stub_ctr; // monitor exit stub
559 static int _mon_enter_ctr; // monitor enter slow
560 static int _mon_exit_ctr; // monitor exit slow
561 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
562
563 // Statistics code
564 // stats for "normal" compiled calls (non-interface)
565 static int _nof_normal_calls; // total # of calls
566 static int _nof_optimized_calls; // total # of statically-bound calls
567 static int _nof_inlined_calls; // total # of inlined normal calls
568 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
569 static int _nof_inlined_static_calls; // total # of inlined static calls
570 // stats for compiled interface calls
571 static int _nof_interface_calls; // total # of compiled calls
572 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
573 static int _nof_inlined_interface_calls; // total # of inlined interface calls
574 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
575 // stats for runtime exceptions
576 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
577
578 public: // for compiler
579 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
580 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
581 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
582 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
583 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
584 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
585 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
586 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
587 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
588 static void print_call_statistics(int comp_total);
589 static void print_statistics();
590 static void print_ic_miss_histogram();
591
592 #endif // PRODUCT
593 };
594
595
596 // ---------------------------------------------------------------------------
597 // Implementation of AdapterHandlerLibrary
598 //
599 // This library manages argument marshaling adapters and native wrappers.
600 // There are 2 flavors of adapters: I2C and C2I.
601 //
602 // The I2C flavor takes a stock interpreted call setup, marshals the
603 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
604 // code_begin(). It is broken to call it without an nmethod assigned.
605 // The usual behavior is to lift any register arguments up out of the
606 // stack and possibly re-pack the extra arguments to be contiguous.
607 // I2C adapters will save what the interpreter's stack pointer will be
608 // after arguments are popped, then adjust the interpreter's frame
609 // size to force alignment and possibly to repack the arguments.
610 // After re-packing, it jumps to the compiled code start. There are
611 // no safepoints in this adapter code and a GC cannot happen while
612 // marshaling is in progress.
613 //
614 // The C2I flavor takes a stock compiled call setup plus the target method in
615 // Rmethod, marshals the arguments for an interpreted call and jumps to
616 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
617 // setup. Compiled frames are fixed-size and the args are likely not in the
618 // right place. Hence all the args will likely be copied into the
619 // interpreter's frame, forcing that frame to grow. The compiled frame's
620 // outgoing stack args will be dead after the copy.
621 //
622 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
623 // also perform an official frame push & pop. They have a call to the native
624 // routine in their middles and end in a return (instead of ending in a jump).
625 // The native wrappers are stored in real nmethods instead of the BufferBlobs
626 // used by the adapters. The code generation happens here because it's very
627 // similar to what the adapters have to do.
628
629 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
630 friend class AdapterHandlerTable;
631
632 private:
633 AdapterFingerPrint* _fingerprint;
634 address _i2c_entry;
635 address _c2i_entry;
636 address _c2i_unverified_entry;
637
638 #ifdef ASSERT
639 // Captures code and signature used to generate this adapter when
640 // verifying adapter equivalence.
641 unsigned char* _saved_code;
642 int _saved_code_length;
643 #endif
644
645 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
646 _fingerprint = fingerprint;
647 _i2c_entry = i2c_entry;
648 _c2i_entry = c2i_entry;
649 _c2i_unverified_entry = c2i_unverified_entry;
650 #ifdef ASSERT
651 _saved_code = NULL;
652 _saved_code_length = 0;
653 #endif
654 }
655
656 void deallocate();
657
658 // should never be used
659 AdapterHandlerEntry();
660
661 public:
662 address get_i2c_entry() const { return _i2c_entry; }
663 address get_c2i_entry() const { return _c2i_entry; }
664 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
665 address base_address();
666 void relocate(address new_base);
667
668 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
669
670 AdapterHandlerEntry* next() {
671 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
672 }
673
674 #ifdef ASSERT
675 // Used to verify that code generated for shared adapters is equivalent
676 void save_code (unsigned char* code, int length);
677 bool compare_code(unsigned char* code, int length);
678 #endif
679
680 //virtual void print_on(outputStream* st) const; DO NOT USE
681 void print_adapter_on(outputStream* st) const;
682 };
683
684 // This class is used only with DumpSharedSpaces==true. It holds extra information
685 // that's used only during CDS dump time.
686 // For details, see comments around Method::link_method()
687 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
688 address _c2i_entry_trampoline; // allocated from shared spaces "MC" region
689 AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region
690
691 public:
692 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; }
693 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
694 void init() NOT_CDS_RETURN;
695 };
696
697
698 class AdapterHandlerLibrary: public AllStatic {
699 private:
700 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
701 static AdapterHandlerTable* _adapters;
702 static AdapterHandlerEntry* _abstract_method_handler;
703 static BufferBlob* buffer_blob();
704 static void initialize();
705 static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
706
707 public:
708
709 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
710 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
711 static void create_native_wrapper(const methodHandle& method);
712 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
713
714 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
715 static void print_handler_on(outputStream* st, const CodeBlob* b);
716 static bool contains(const CodeBlob* b);
717 #ifndef PRODUCT
718 static void print_statistics();
719 #endif // PRODUCT
720
721 };
722
723 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP