1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
27
28 #include "interpreter/bytecodeHistogram.hpp"
29 #include "interpreter/bytecodeTracer.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "runtime/threadLocalStorage.hpp"
34 #include "utilities/hashtable.hpp"
35 #include "utilities/macros.hpp"
36
37 class AdapterHandlerEntry;
38 class AdapterHandlerTable;
39 class AdapterFingerPrint;
40 class vframeStream;
41
42 // Runtime is the base class for various runtime interfaces
43 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
44 // shared functionality such as exception forwarding (C++ to
45 // Java exceptions), locking/unlocking mechanisms, statistical
46 // information, etc.
47
48 class SharedRuntime: AllStatic {
49 friend class VMStructs;
50
51 private:
52 static methodHandle resolve_sub_helper(JavaThread *thread,
53 bool is_virtual,
54 bool is_optimized, TRAPS);
55
56 // Shared stub locations
57
58 static RuntimeStub* _wrong_method_blob;
59 static RuntimeStub* _wrong_method_abstract_blob;
60 static RuntimeStub* _ic_miss_blob;
61 static RuntimeStub* _resolve_opt_virtual_call_blob;
62 static RuntimeStub* _resolve_virtual_call_blob;
63 static RuntimeStub* _resolve_static_call_blob;
64
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 #ifdef __SOFTFP__
105 static jfloat fadd(jfloat x, jfloat y);
106 static jfloat fsub(jfloat x, jfloat y);
107 static jfloat fmul(jfloat x, jfloat y);
108 static jfloat fdiv(jfloat x, jfloat y);
109
110 static jdouble dadd(jdouble x, jdouble y);
111 static jdouble dsub(jdouble x, jdouble y);
112 static jdouble dmul(jdouble x, jdouble y);
113 static jdouble ddiv(jdouble x, jdouble y);
114 #endif // __SOFTFP__
115
116 // float conversion (needs to set appropriate rounding mode)
117 static jint f2i (jfloat x);
118 static jlong f2l (jfloat x);
119 static jint d2i (jdouble x);
120 static jlong d2l (jdouble x);
121 static jfloat d2f (jdouble x);
122 static jfloat l2f (jlong x);
123 static jdouble l2d (jlong x);
124
125 #ifdef __SOFTFP__
126 static jfloat i2f (jint x);
127 static jdouble i2d (jint x);
128 static jdouble f2d (jfloat x);
129 #endif // __SOFTFP__
130
131 // double trigonometrics and transcendentals
132 static jdouble dsin(jdouble x);
133 static jdouble dcos(jdouble x);
134 static jdouble dtan(jdouble x);
135 static jdouble dlog(jdouble x);
136 static jdouble dlog10(jdouble x);
137 static jdouble dexp(jdouble x);
138 static jdouble dpow(jdouble x, jdouble y);
139
140 #if defined(__SOFTFP__) || defined(E500V2)
141 static double dabs(double f);
142 #endif
143
144 #if defined(__SOFTFP__) || defined(PPC32)
145 static double dsqrt(double f);
146 #endif
147
148 // Montgomery multiplication
149 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
150 jint len, jlong inv, jint *m_ints);
151 static void montgomery_square(jint *a_ints, jint *n_ints,
152 jint len, jlong inv, jint *m_ints);
153
154 #ifdef __SOFTFP__
155 // C++ compiler generates soft float instructions as well as passing
156 // float and double in registers.
157 static int fcmpl(float x, float y);
158 static int fcmpg(float x, float y);
159 static int dcmpl(double x, double y);
160 static int dcmpg(double x, double y);
161
162 static int unordered_fcmplt(float x, float y);
163 static int unordered_dcmplt(double x, double y);
164 static int unordered_fcmple(float x, float y);
165 static int unordered_dcmple(double x, double y);
166 static int unordered_fcmpge(float x, float y);
167 static int unordered_dcmpge(double x, double y);
168 static int unordered_fcmpgt(float x, float y);
169 static int unordered_dcmpgt(double x, double y);
170
171 static float fneg(float f);
172 static double dneg(double f);
173 #endif
174
175 // exception handling across interpreter/compiler boundaries
176 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
177 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
178 static void thread_local_safepoint(JavaThread *thread);
179
180 #if INCLUDE_ALL_GCS
181 // G1 write barriers
182 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
183 static void g1_wb_post(void* card_addr, JavaThread* thread);
184 #endif // INCLUDE_ALL_GCS
185
186 // exception handling and implicit exceptions
187 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
188 bool force_unwind, bool top_frame_only);
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 address continuation_for_implicit_exception(JavaThread* thread,
201 address faulting_pc,
202 ImplicitExceptionKind exception_kind);
203
204 // Shared stub locations
205 static address get_poll_stub(address pc);
206
207 static address get_ic_miss_stub() {
208 assert(_ic_miss_blob!= NULL, "oops");
209 return _ic_miss_blob->entry_point();
210 }
211
212 static address get_handle_wrong_method_stub() {
213 assert(_wrong_method_blob!= NULL, "oops");
214 return _wrong_method_blob->entry_point();
215 }
216
217 static address get_handle_wrong_method_abstract_stub() {
218 assert(_wrong_method_abstract_blob!= NULL, "oops");
219 return _wrong_method_abstract_blob->entry_point();
220 }
221
222 #ifdef COMPILER2
223 static void generate_uncommon_trap_blob(void);
224 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
225 #endif // COMPILER2
226
227 static address get_resolve_opt_virtual_call_stub() {
228 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
229 return _resolve_opt_virtual_call_blob->entry_point();
230 }
231 static address get_resolve_virtual_call_stub() {
232 assert(_resolve_virtual_call_blob != NULL, "oops");
233 return _resolve_virtual_call_blob->entry_point();
234 }
235 static address get_resolve_static_call_stub() {
236 assert(_resolve_static_call_blob != NULL, "oops");
237 return _resolve_static_call_blob->entry_point();
238 }
239
240 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
241 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
242 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
243
244 // Counters
245 #ifndef PRODUCT
246 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
247 #endif // PRODUCT
248
249 // Helper routine for full-speed JVMTI exception throwing support
250 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
251 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
252
253 // RedefineClasses() tracing support for obsolete method entry
254 static int rc_trace_method_entry(JavaThread* thread, Method* m);
255
256 // To be used as the entry point for unresolved native methods.
257 static address native_method_throw_unsatisfied_link_error_entry();
258 static address native_method_throw_unsupported_operation_exception_entry();
259
260 // bytecode tracing is only used by the TraceBytecodes
261 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
262
263 static oop retrieve_receiver(Symbol* sig, frame caller);
264
265 static void register_finalizer(JavaThread* thread, oopDesc* obj);
266
267 // dtrace notifications
268 static int dtrace_object_alloc(oopDesc* o, int size);
269 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);
270 static int dtrace_method_entry(JavaThread* thread, Method* m);
271 static int dtrace_method_exit(JavaThread* thread, Method* m);
272
273 // Utility method for retrieving the Java thread id, returns 0 if the
274 // thread is not a well formed Java thread.
275 static jlong get_java_tid(Thread* thread);
276
277
278 // used by native wrappers to reenable yellow if overflow happened in native code
279 static void reguard_yellow_pages();
280
281 // Fill in the "X cannot be cast to a Y" message for ClassCastException
282 //
283 // @param thr the current thread
284 // @param name the name of the class of the object attempted to be cast
285 // @return the dynamically allocated exception message (must be freed
286 // by the caller using a resource mark)
287 //
288 // BCP must refer to the current 'checkcast' opcode for the frame
289 // on top of the stack.
290 // The caller (or one of it's callers) must use a ResourceMark
291 // in order to correctly free the result.
292 //
293 static char* generate_class_cast_message(JavaThread* thr, const char* name);
294
295 // Fill in the "X cannot be cast to a Y" message for ClassCastException
296 //
297 // @param name the name of the class of the object attempted to be cast
298 // @param klass the name of the target klass attempt
299 // @param gripe the specific kind of problem being reported
300 // @return the dynamically allocated exception message (must be freed
301 // by the caller using a resource mark)
302 //
303 // This version does not require access the frame, so it can be called
304 // from interpreted code
305 // The caller (or one of it's callers) must use a ResourceMark
306 // in order to correctly free the result.
307 //
308 static char* generate_class_cast_message(const char* name, const char* klass,
309 const char* gripe = " cannot be cast to ");
310
311 // Resolves a call site- may patch in the destination of the call into the
312 // compiled code.
313 static methodHandle resolve_helper(JavaThread *thread,
314 bool is_virtual,
315 bool is_optimized, TRAPS);
316
317 private:
318 // deopt blob
319 static void generate_deopt_blob(void);
320
321 public:
322 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
323
324 // Resets a call-site in compiled code so it will get resolved again.
325 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
326
327 // In the code prolog, if the klass comparison fails, the inline cache
328 // misses and the call site is patched to megamorphic
329 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
330
331 // Find the method that called us.
332 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
333
334
335 private:
336 static Handle find_callee_info(JavaThread* thread,
337 Bytecodes::Code& bc,
338 CallInfo& callinfo, TRAPS);
339 static Handle find_callee_info_helper(JavaThread* thread,
340 vframeStream& vfst,
341 Bytecodes::Code& bc,
342 CallInfo& callinfo, TRAPS);
343
344 static address clean_virtual_call_entry();
345 static address clean_opt_virtual_call_entry();
346 static address clean_static_call_entry();
347
348 public:
349
350 // Read the array of BasicTypes from a Java signature, and compute where
351 // compiled Java code would like to put the results. Values in reg_lo and
352 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
353 // registers, those above refer to 4-byte stack slots. All stack slots are
354 // based off of the window top. SharedInfo::stack0 refers to the first usable
355 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
356 // 4-bytes higher. So for sparc because the register window save area is at
357 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
358 // will be just above it. (
359 // return value is the maximum number of VMReg stack slots the convention will use.
360 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
361
362 static void check_member_name_argument_is_last_argument(methodHandle method,
363 const BasicType* sig_bt,
364 const VMRegPair* regs) NOT_DEBUG_RETURN;
365
366 // Ditto except for calling C
367 //
368 // C argument in register AND stack slot.
369 // Some architectures require that an argument must be passed in a register
370 // AND in a stack slot. These architectures provide a second VMRegPair array
371 // to be filled by the c_calling_convention method. On other architectures,
372 // NULL is being passed as the second VMRegPair array, so arguments are either
373 // passed in a register OR in a stack slot.
374 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
375 int total_args_passed);
376
377 // Compute the new number of arguments in the signature if 32 bit ints
378 // must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
379 // is true.
380 static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
381 // Adapt a method's signature if it contains 32 bit integers that must
382 // be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
383 // is true.
384 static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
385 BasicType*& in_sig_bt, VMRegPair*& in_regs);
386
387 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
388 // blobs. Unlike adapters in the tiger and earlier releases the code in these
389 // blobs does not create a new frame and are therefore virtually invisible
390 // to the stack walking code. In general these blobs extend the callers stack
391 // as needed for the conversion of argument locations.
392
393 // When calling a c2i blob the code will always call the interpreter even if
394 // by the time we reach the blob there is compiled code available. This allows
395 // the blob to pass the incoming stack pointer (the sender sp) in a known
396 // location for the interpreter to record. This is used by the frame code
397 // to correct the sender code to match up with the stack pointer when the
398 // thread left the compiled code. In addition it allows the interpreter
399 // to remove the space the c2i adapter allocated to do its argument conversion.
400
401 // Although a c2i blob will always run interpreted even if compiled code is
402 // present if we see that compiled code is present the compiled call site
403 // will be patched/re-resolved so that later calls will run compiled.
404
405 // Additionally a c2i blob need to have a unverified entry because it can be reached
406 // in situations where the call site is an inlined cache site and may go megamorphic.
407
408 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
409 // that the interpreter before it does any call dispatch will record the current
410 // stack pointer in the interpreter frame. On return it will restore the stack
411 // pointer as needed. This means the i2c adapter code doesn't need any special
412 // handshaking path with compiled code to keep the stack walking correct.
413
414 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
415 int total_args_passed,
416 int max_arg,
417 const BasicType *sig_bt,
418 const VMRegPair *regs,
419 AdapterFingerPrint* fingerprint);
420
421 // OSR support
422
423 // OSR_migration_begin will extract the jvm state from an interpreter
424 // frame (locals, monitors) and store the data in a piece of C heap
425 // storage. This then allows the interpreter frame to be removed from the
426 // stack and the OSR nmethod to be called. That method is called with a
427 // pointer to the C heap storage. This pointer is the return value from
428 // OSR_migration_begin.
429
430 static intptr_t* OSR_migration_begin(JavaThread *thread);
431
432 // OSR_migration_end is a trivial routine. It is called after the compiled
433 // method has extracted the jvm state from the C heap that OSR_migration_begin
434 // created. It's entire job is to simply free this storage.
435 static void OSR_migration_end(intptr_t* buf);
436
437 // Convert a sig into a calling convention register layout
438 // and find interesting things about it.
439 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
440 static VMReg name_for_receiver();
441
442 // "Top of Stack" slots that may be unused by the calling convention but must
443 // otherwise be preserved.
444 // On Intel these are not necessary and the value can be zero.
445 // On Sparc this describes the words reserved for storing a register window
446 // when an interrupt occurs.
447 static uint out_preserve_stack_slots();
448
449 // Is vector's size (in bytes) bigger than a size saved by default?
450 // For example, on x86 16 bytes XMM registers are saved by default.
451 static bool is_wide_vector(int size);
452
453 // Save and restore a native result
454 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
455 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
456
457 // Generate a native wrapper for a given method. The method takes arguments
458 // in the Java compiled code convention, marshals them to the native
459 // convention (handlizes oops, etc), transitions to native, makes the call,
460 // returns to java state (possibly blocking), unhandlizes any result and
461 // returns.
462 //
463 // The wrapper may contain special-case code if the given method
464 // is a JNI critical method, or a compiled method handle adapter,
465 // such as _invokeBasic, _linkToVirtual, etc.
466 static nmethod* generate_native_wrapper(MacroAssembler* masm,
467 methodHandle method,
468 int compile_id,
469 BasicType* sig_bt,
470 VMRegPair* regs,
471 BasicType ret_type);
472
473 // Block before entering a JNI critical method
474 static void block_for_jni_critical(JavaThread* thread);
475
476 // A compiled caller has just called the interpreter, but compiled code
477 // exists. Patch the caller so he no longer calls into the interpreter.
478 static void fixup_callers_callsite(Method* moop, address ret_pc);
479
480 // Slow-path Locking and Unlocking
481 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
482 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
483
484 // Resolving of calls
485 static address resolve_static_call_C (JavaThread *thread);
486 static address resolve_virtual_call_C (JavaThread *thread);
487 static address resolve_opt_virtual_call_C(JavaThread *thread);
488
489 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
490 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
491 oopDesc* dest, jint dest_pos,
492 jint length, JavaThread* thread);
493
494 // handle ic miss with caller being compiled code
495 // wrong method handling (inline cache misses, zombie methods)
496 static address handle_wrong_method(JavaThread* thread);
497 static address handle_wrong_method_abstract(JavaThread* thread);
498 static address handle_wrong_method_ic_miss(JavaThread* thread);
499
500 #ifndef PRODUCT
501
502 // Collect and print inline cache miss statistics
503 private:
504 enum { maxICmiss_count = 100 };
505 static int _ICmiss_index; // length of IC miss histogram
506 static int _ICmiss_count[maxICmiss_count]; // miss counts
507 static address _ICmiss_at[maxICmiss_count]; // miss addresses
508 static void trace_ic_miss(address at);
509
510 public:
511 static int _throw_null_ctr; // throwing a null-pointer exception
512 static int _ic_miss_ctr; // total # of IC misses
513 static int _wrong_method_ctr;
514 static int _resolve_static_ctr;
515 static int _resolve_virtual_ctr;
516 static int _resolve_opt_virtual_ctr;
517 static int _implicit_null_throws;
518 static int _implicit_div0_throws;
519
520 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
521 static int _jshort_array_copy_ctr; // Slow-path short array copy
522 static int _jint_array_copy_ctr; // Slow-path int array copy
523 static int _jlong_array_copy_ctr; // Slow-path long array copy
524 static int _oop_array_copy_ctr; // Slow-path oop array copy
525 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
526 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
527 static int _generic_array_copy_ctr; // Slow-path includes type decoding
528 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
529
530 static int _new_instance_ctr; // 'new' object requires GC
531 static int _new_array_ctr; // 'new' array requires GC
532 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
533 static int _find_handler_ctr; // find exception handler
534 static int _rethrow_ctr; // rethrow exception
535 static int _mon_enter_stub_ctr; // monitor enter stub
536 static int _mon_exit_stub_ctr; // monitor exit stub
537 static int _mon_enter_ctr; // monitor enter slow
538 static int _mon_exit_ctr; // monitor exit slow
539 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
540
541 // Statistics code
542 // stats for "normal" compiled calls (non-interface)
543 static int _nof_normal_calls; // total # of calls
544 static int _nof_optimized_calls; // total # of statically-bound calls
545 static int _nof_inlined_calls; // total # of inlined normal calls
546 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
547 static int _nof_inlined_static_calls; // total # of inlined static calls
548 // stats for compiled interface calls
549 static int _nof_interface_calls; // total # of compiled calls
550 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
551 static int _nof_inlined_interface_calls; // total # of inlined interface calls
552 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
553 // stats for runtime exceptions
554 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
555
556 public: // for compiler
557 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
558 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
559 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
560 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
561 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
562 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
563 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
564 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
565 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
566 static void print_call_statistics(int comp_total);
567 static void print_statistics();
568 static void print_ic_miss_histogram();
569
570 #endif // PRODUCT
571 };
572
573
574 // ---------------------------------------------------------------------------
575 // Implementation of AdapterHandlerLibrary
576 //
577 // This library manages argument marshaling adapters and native wrappers.
578 // There are 2 flavors of adapters: I2C and C2I.
579 //
580 // The I2C flavor takes a stock interpreted call setup, marshals the
581 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
582 // code_begin(). It is broken to call it without an nmethod assigned.
583 // The usual behavior is to lift any register arguments up out of the
584 // stack and possibly re-pack the extra arguments to be contiguous.
585 // I2C adapters will save what the interpreter's stack pointer will be
586 // after arguments are popped, then adjust the interpreter's frame
587 // size to force alignment and possibly to repack the arguments.
588 // After re-packing, it jumps to the compiled code start. There are
589 // no safepoints in this adapter code and a GC cannot happen while
590 // marshaling is in progress.
591 //
592 // The C2I flavor takes a stock compiled call setup plus the target method in
593 // Rmethod, marshals the arguments for an interpreted call and jumps to
594 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
595 // setup. Compiled frames are fixed-size and the args are likely not in the
596 // right place. Hence all the args will likely be copied into the
597 // interpreter's frame, forcing that frame to grow. The compiled frame's
598 // outgoing stack args will be dead after the copy.
599 //
600 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
601 // also perform an official frame push & pop. They have a call to the native
602 // routine in their middles and end in a return (instead of ending in a jump).
603 // The native wrappers are stored in real nmethods instead of the BufferBlobs
604 // used by the adapters. The code generation happens here because it's very
605 // similar to what the adapters have to do.
606
607 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
608 friend class AdapterHandlerTable;
609
610 private:
611 AdapterFingerPrint* _fingerprint;
612 address _i2c_entry;
613 address _c2i_entry;
614 address _c2i_unverified_entry;
615
616 #ifdef ASSERT
617 // Captures code and signature used to generate this adapter when
618 // verifying adapter equivalence.
619 unsigned char* _saved_code;
620 int _saved_code_length;
621 #endif
622
623 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
624 _fingerprint = fingerprint;
625 _i2c_entry = i2c_entry;
626 _c2i_entry = c2i_entry;
627 _c2i_unverified_entry = c2i_unverified_entry;
628 #ifdef ASSERT
629 _saved_code = NULL;
630 _saved_code_length = 0;
631 #endif
632 }
633
634 void deallocate();
635
636 // should never be used
637 AdapterHandlerEntry();
638
639 public:
640 address get_i2c_entry() const { return _i2c_entry; }
641 address get_c2i_entry() const { return _c2i_entry; }
642 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
643 address base_address();
644 void relocate(address new_base);
645
646 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
647
648 AdapterHandlerEntry* next() {
649 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
650 }
651
652 #ifdef ASSERT
653 // Used to verify that code generated for shared adapters is equivalent
654 void save_code (unsigned char* code, int length);
655 bool compare_code(unsigned char* code, int length);
656 #endif
657
658 //virtual void print_on(outputStream* st) const; DO NOT USE
659 void print_adapter_on(outputStream* st) const;
660 };
661
662 class AdapterHandlerLibrary: public AllStatic {
663 private:
664 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
665 static AdapterHandlerTable* _adapters;
666 static AdapterHandlerEntry* _abstract_method_handler;
667 static BufferBlob* buffer_blob();
668 static void initialize();
669
670 public:
671
672 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
673 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
674 static void create_native_wrapper(methodHandle method);
675 static AdapterHandlerEntry* get_adapter(methodHandle method);
676
677 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
678 static void print_handler_on(outputStream* st, CodeBlob* b);
679 static bool contains(CodeBlob* b);
680 #ifndef PRODUCT
681 static void print_statistics();
682 #endif // PRODUCT
683
684 };
685
686 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP