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comparison src/share/vm/runtime/sharedRuntime.hpp @ 0:a61af66fc99e jdk7-b24

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date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 class AdapterHandlerEntry;
26 class vframeStream;
27
28 // Runtime is the base class for various runtime interfaces
29 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
30 // shared functionality such as exception forwarding (C++ to
31 // Java exceptions), locking/unlocking mechanisms, statistical
32 // information, etc.
33
34 class SharedRuntime: AllStatic {
35 private:
36 static methodHandle resolve_sub_helper(JavaThread *thread,
37 bool is_virtual,
38 bool is_optimized, TRAPS);
39
40 // Shared stub locations
41
42 static RuntimeStub* _wrong_method_blob;
43 static RuntimeStub* _ic_miss_blob;
44 static RuntimeStub* _resolve_opt_virtual_call_blob;
45 static RuntimeStub* _resolve_virtual_call_blob;
46 static RuntimeStub* _resolve_static_call_blob;
47
48 static SafepointBlob* _polling_page_safepoint_handler_blob;
49 static SafepointBlob* _polling_page_return_handler_blob;
50 #ifdef COMPILER2
51 static ExceptionBlob* _exception_blob;
52 static UncommonTrapBlob* _uncommon_trap_blob;
53 #endif // COMPILER2
54
55 #ifndef PRODUCT
56
57 // Counters
58 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
59
60 #endif // !PRODUCT
61 public:
62 // The following arithmetic routines are used on platforms that do
63 // not have machine instructions to implement their functionality.
64 // Do not remove these.
65
66 // long arithmetics
67 static jlong lmul(jlong y, jlong x);
68 static jlong ldiv(jlong y, jlong x);
69 static jlong lrem(jlong y, jlong x);
70
71 // float and double remainder
72 static jfloat frem(jfloat x, jfloat y);
73 static jdouble drem(jdouble x, jdouble y);
74
75 // float conversion (needs to set appropriate rounding mode)
76 static jint f2i (jfloat x);
77 static jlong f2l (jfloat x);
78 static jint d2i (jdouble x);
79 static jlong d2l (jdouble x);
80 static jfloat d2f (jdouble x);
81 static jfloat l2f (jlong x);
82 static jdouble l2d (jlong x);
83
84 // double trigonometrics and transcendentals
85 static jdouble dsin(jdouble x);
86 static jdouble dcos(jdouble x);
87 static jdouble dtan(jdouble x);
88 static jdouble dlog(jdouble x);
89 static jdouble dlog10(jdouble x);
90 static jdouble dexp(jdouble x);
91 static jdouble dpow(jdouble x, jdouble y);
92
93
94 // exception handling across interpreter/compiler boundaries
95 static address raw_exception_handler_for_return_address(address return_address);
96 static address exception_handler_for_return_address(address return_address);
97
98 // exception handling and implicit exceptions
99 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
100 bool force_unwind, bool top_frame_only);
101 enum ImplicitExceptionKind {
102 IMPLICIT_NULL,
103 IMPLICIT_DIVIDE_BY_ZERO,
104 STACK_OVERFLOW
105 };
106 static void throw_AbstractMethodError(JavaThread* thread);
107 static void throw_ArithmeticException(JavaThread* thread);
108 static void throw_NullPointerException(JavaThread* thread);
109 static void throw_NullPointerException_at_call(JavaThread* thread);
110 static void throw_StackOverflowError(JavaThread* thread);
111 static address continuation_for_implicit_exception(JavaThread* thread,
112 address faulting_pc,
113 ImplicitExceptionKind exception_kind);
114
115 // Shared stub locations
116 static address get_poll_stub(address pc);
117
118 static address get_ic_miss_stub() {
119 assert(_ic_miss_blob!= NULL, "oops");
120 return _ic_miss_blob->instructions_begin();
121 }
122
123 static address get_handle_wrong_method_stub() {
124 assert(_wrong_method_blob!= NULL, "oops");
125 return _wrong_method_blob->instructions_begin();
126 }
127
128 #ifdef COMPILER2
129 static void generate_uncommon_trap_blob(void);
130 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
131 #endif // COMPILER2
132
133 static address get_resolve_opt_virtual_call_stub(){
134 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
135 return _resolve_opt_virtual_call_blob->instructions_begin();
136 }
137 static address get_resolve_virtual_call_stub() {
138 assert(_resolve_virtual_call_blob != NULL, "oops");
139 return _resolve_virtual_call_blob->instructions_begin();
140 }
141 static address get_resolve_static_call_stub() {
142 assert(_resolve_static_call_blob != NULL, "oops");
143 return _resolve_static_call_blob->instructions_begin();
144 }
145
146 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
147 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
148
149 // Counters
150 #ifndef PRODUCT
151 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
152 #endif // PRODUCT
153
154 // Helper routine for full-speed JVMTI exception throwing support
155 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
156 static void throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message = NULL);
157
158 // To be used as the entry point for unresolved native methods.
159 static address native_method_throw_unsatisfied_link_error_entry();
160
161 // bytecode tracing is only used by the TraceBytecodes
162 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
163
164 // Used to back off a spin lock that is under heavy contention
165 static void yield_all(JavaThread* thread, int attempts = 0);
166
167 static oop retrieve_receiver( symbolHandle sig, frame caller );
168
169 static void verify_caller_frame(frame caller_frame, methodHandle callee_method) PRODUCT_RETURN;
170 static methodHandle find_callee_method_inside_interpreter(frame caller_frame, methodHandle caller_method, int bci) PRODUCT_RETURN_(return methodHandle(););
171
172 static void register_finalizer(JavaThread* thread, oopDesc* obj);
173
174 // dtrace notifications
175 static int dtrace_object_alloc(oopDesc* o);
176 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
177 static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m);
178 static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m);
179
180 // Utility method for retrieving the Java thread id, returns 0 if the
181 // thread is not a well formed Java thread.
182 static jlong get_java_tid(Thread* thread);
183
184
185 // used by native wrappers to reenable yellow if overflow happened in native code
186 static void reguard_yellow_pages();
187
188 /**
189 * Fill in the "X cannot be cast to a Y" message for ClassCastException
190 *
191 * @param thr the current thread
192 * @param name the name of the class of the object attempted to be cast
193 * @return the dynamically allocated exception message (must be freed
194 * by the caller using a resource mark)
195 *
196 * BCP must refer to the current 'checkcast' opcode for the frame
197 * on top of the stack.
198 * The caller (or one of it's callers) must use a ResourceMark
199 * in order to correctly free the result.
200 */
201 static char* generate_class_cast_message(JavaThread* thr, const char* name);
202
203 /**
204 * Fill in the "X cannot be cast to a Y" message for ClassCastException
205 *
206 * @param name the name of the class of the object attempted to be cast
207 * @param klass the name of the target klass attempt
208 * @return the dynamically allocated exception message (must be freed
209 * by the caller using a resource mark)
210 *
211 * This version does not require access the frame, so it can be called
212 * from interpreted code
213 * The caller (or one of it's callers) must use a ResourceMark
214 * in order to correctly free the result.
215 */
216 static char* generate_class_cast_message(const char* name, const char* klass);
217
218 // Resolves a call site- may patch in the destination of the call into the
219 // compiled code.
220 static methodHandle resolve_helper(JavaThread *thread,
221 bool is_virtual,
222 bool is_optimized, TRAPS);
223
224 static void generate_stubs(void);
225
226 private:
227 // deopt blob
228 static void generate_deopt_blob(void);
229 static DeoptimizationBlob* _deopt_blob;
230
231 public:
232 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
233
234 // Resets a call-site in compiled code so it will get resolved again.
235 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
236
237 // In the code prolog, if the klass comparison fails, the inline cache
238 // misses and the call site is patched to megamorphic
239 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
240
241 // Find the method that called us.
242 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
243
244
245 private:
246 static Handle find_callee_info(JavaThread* thread,
247 Bytecodes::Code& bc,
248 CallInfo& callinfo, TRAPS);
249 static Handle find_callee_info_helper(JavaThread* thread,
250 vframeStream& vfst,
251 Bytecodes::Code& bc,
252 CallInfo& callinfo, TRAPS);
253
254 static address clean_virtual_call_entry();
255 static address clean_opt_virtual_call_entry();
256 static address clean_static_call_entry();
257
258 public:
259
260
261 static void create_native_wrapper (JavaThread* thread, methodOop method);
262
263 // Read the array of BasicTypes from a Java signature, and compute where
264 // compiled Java code would like to put the results. Values in reg_lo and
265 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
266 // registers, those above refer to 4-byte stack slots. All stack slots are
267 // based off of the window top. SharedInfo::stack0 refers to the first usable
268 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
269 // 4-bytes higher. So for sparc because the register window save area is at
270 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
271 // will be just above it. (
272 // return value is the maximum number of VMReg stack slots the convention will use.
273 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing);
274
275 // Ditto except for calling C
276 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
277
278 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
279 // blobs. Unlike adapters in the tiger and earlier releases the code in these
280 // blobs does not create a new frame and are therefore virtually invisible
281 // to the stack walking code. In general these blobs extend the callers stack
282 // as needed for the conversion of argument locations.
283
284 // When calling a c2i blob the code will always call the interpreter even if
285 // by the time we reach the blob there is compiled code available. This allows
286 // the blob to pass the incoming stack pointer (the sender sp) in a known
287 // location for the interpreter to record. This is used by the frame code
288 // to correct the sender code to match up with the stack pointer when the
289 // thread left the compiled code. In addition it allows the interpreter
290 // to remove the space the c2i adapter allocated to do it argument conversion.
291
292 // Although a c2i blob will always run interpreted even if compiled code is
293 // present if we see that compiled code is present the compiled call site
294 // will be patched/re-resolved so that later calls will run compiled.
295
296 // Aditionally a c2i blob need to have a unverified entry because it can be reached
297 // in situations where the call site is an inlined cache site and may go megamorphic.
298
299 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
300 // that the interpreter before it does any call dispatch will record the current
301 // stack pointer in the interpreter frame. On return it will restore the stack
302 // pointer as needed. This means the i2c adapter code doesn't need any special
303 // handshaking path with compiled code to keep the stack walking correct.
304
305 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
306 int total_args_passed,
307 int max_arg,
308 const BasicType *sig_bt,
309 const VMRegPair *regs);
310
311 // OSR support
312
313 // OSR_migration_begin will extract the jvm state from an interpreter
314 // frame (locals, monitors) and store the data in a piece of C heap
315 // storage. This then allows the interpreter frame to be removed from the
316 // stack and the OSR nmethod to be called. That method is called with a
317 // pointer to the C heap storage. This pointer is the return value from
318 // OSR_migration_begin.
319
320 static intptr_t* OSR_migration_begin( JavaThread *thread);
321
322 // OSR_migration_end is a trivial routine. It is called after the compiled
323 // method has extracted the jvm state from the C heap that OSR_migration_begin
324 // created. It's entire job is to simply free this storage.
325 static void OSR_migration_end ( intptr_t* buf);
326
327 // Convert a sig into a calling convention register layout
328 // and find interesting things about it.
329 static VMRegPair* find_callee_arguments(symbolOop sig, bool is_static, int *arg_size);
330 static VMReg name_for_receiver();
331
332 // "Top of Stack" slots that may be unused by the calling convention but must
333 // otherwise be preserved.
334 // On Intel these are not necessary and the value can be zero.
335 // On Sparc this describes the words reserved for storing a register window
336 // when an interrupt occurs.
337 static uint out_preserve_stack_slots();
338
339 // Save and restore a native result
340 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
341 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
342
343 // Generate a native wrapper for a given method. The method takes arguments
344 // in the Java compiled code convention, marshals them to the native
345 // convention (handlizes oops, etc), transitions to native, makes the call,
346 // returns to java state (possibly blocking), unhandlizes any result and
347 // returns.
348 static nmethod *generate_native_wrapper(MacroAssembler* masm,
349 methodHandle method,
350 int total_args_passed,
351 int max_arg,
352 BasicType *sig_bt,
353 VMRegPair *regs,
354 BasicType ret_type );
355
356 // A compiled caller has just called the interpreter, but compiled code
357 // exists. Patch the caller so he no longer calls into the interpreter.
358 static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc);
359
360 // Slow-path Locking and Unlocking
361 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
362 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
363
364 // Resolving of calls
365 static address resolve_static_call_C (JavaThread *thread);
366 static address resolve_virtual_call_C (JavaThread *thread);
367 static address resolve_opt_virtual_call_C(JavaThread *thread);
368
369 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
370 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
371 oopDesc* dest, jint dest_pos,
372 jint length, JavaThread* thread);
373
374 // handle ic miss with caller being compiled code
375 // wrong method handling (inline cache misses, zombie methods)
376 static address handle_wrong_method(JavaThread* thread);
377 static address handle_wrong_method_ic_miss(JavaThread* thread);
378
379 #ifndef PRODUCT
380
381 // Collect and print inline cache miss statistics
382 private:
383 enum { maxICmiss_count = 100 };
384 static int _ICmiss_index; // length of IC miss histogram
385 static int _ICmiss_count[maxICmiss_count]; // miss counts
386 static address _ICmiss_at[maxICmiss_count]; // miss addresses
387 static void trace_ic_miss(address at);
388
389 public:
390 static int _monitor_enter_ctr; // monitor enter slow
391 static int _monitor_exit_ctr; // monitor exit slow
392 static int _throw_null_ctr; // throwing a null-pointer exception
393 static int _ic_miss_ctr; // total # of IC misses
394 static int _wrong_method_ctr;
395 static int _resolve_static_ctr;
396 static int _resolve_virtual_ctr;
397 static int _resolve_opt_virtual_ctr;
398 static int _implicit_null_throws;
399 static int _implicit_div0_throws;
400
401 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
402 static int _jshort_array_copy_ctr; // Slow-path short array copy
403 static int _jint_array_copy_ctr; // Slow-path int array copy
404 static int _jlong_array_copy_ctr; // Slow-path long array copy
405 static int _oop_array_copy_ctr; // Slow-path oop array copy
406 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
407 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
408 static int _generic_array_copy_ctr; // Slow-path includes type decoding
409 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
410
411 static int _new_instance_ctr; // 'new' object requires GC
412 static int _new_array_ctr; // 'new' array requires GC
413 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
414 static int _find_handler_ctr; // find exception handler
415 static int _rethrow_ctr; // rethrow exception
416 static int _mon_enter_stub_ctr; // monitor enter stub
417 static int _mon_exit_stub_ctr; // monitor exit stub
418 static int _mon_enter_ctr; // monitor enter slow
419 static int _mon_exit_ctr; // monitor exit slow
420 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
421
422 // Statistics code
423 // stats for "normal" compiled calls (non-interface)
424 static int _nof_normal_calls; // total # of calls
425 static int _nof_optimized_calls; // total # of statically-bound calls
426 static int _nof_inlined_calls; // total # of inlined normal calls
427 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
428 static int _nof_inlined_static_calls; // total # of inlined static calls
429 // stats for compiled interface calls
430 static int _nof_interface_calls; // total # of compiled calls
431 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
432 static int _nof_inlined_interface_calls; // total # of inlined interface calls
433 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
434 // stats for runtime exceptions
435 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
436
437 public: // for compiler
438 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
439 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
440 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
441 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
442 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
443 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
444 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
445 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
446 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
447 static void print_call_statistics(int comp_total);
448 static void print_statistics();
449 static void print_ic_miss_histogram();
450
451 #endif // PRODUCT
452 };
453
454
455 // ---------------------------------------------------------------------------
456 // Implementation of AdapterHandlerLibrary
457 //
458 // This library manages argument marshaling adapters and native wrappers.
459 // There are 2 flavors of adapters: I2C and C2I.
460 //
461 // The I2C flavor takes a stock interpreted call setup, marshals the arguments
462 // for a Java-compiled call, and jumps to Rmethod-> code()->
463 // instructions_begin(). It is broken to call it without an nmethod assigned.
464 // The usual behavior is to lift any register arguments up out of the stack
465 // and possibly re-pack the extra arguments to be contigious. I2C adapters
466 // will save what the interpreter's stack pointer will be after arguments are
467 // popped, then adjust the interpreter's frame size to force alignment and
468 // possibly to repack the arguments. After re-packing, it jumps to the
469 // compiled code start. There are no safepoints in this adapter code and a GC
470 // cannot happen while marshaling is in progress.
471 //
472 // The C2I flavor takes a stock compiled call setup plus the target method in
473 // Rmethod, marshals the arguments for an interpreted call and jumps to
474 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
475 // setup. Compiled frames are fixed-size and the args are likely not in the
476 // right place. Hence all the args will likely be copied into the
477 // interpreter's frame, forcing that frame to grow. The compiled frame's
478 // outgoing stack args will be dead after the copy.
479 //
480 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
481 // also perform an offical frame push & pop. They have a call to the native
482 // routine in their middles and end in a return (instead of ending in a jump).
483 // The native wrappers are stored in real nmethods instead of the BufferBlobs
484 // used by the adapters. The code generation happens here because it's very
485 // similar to what the adapters have to do.
486
487 class AdapterHandlerEntry : public CHeapObj {
488 private:
489 address _i2c_entry;
490 address _c2i_entry;
491 address _c2i_unverified_entry;
492
493 public:
494 AdapterHandlerEntry(address i2c_entry, address c2i_entry, address c2i_unverified_entry):
495 _i2c_entry(i2c_entry),
496 _c2i_entry(c2i_entry),
497 _c2i_unverified_entry(c2i_unverified_entry) {
498 }
499 // The name we give all buffer blobs
500 static const char* name;
501
502 address get_i2c_entry() { return _i2c_entry; }
503 address get_c2i_entry() { return _c2i_entry; }
504 address get_c2i_unverified_entry() { return _c2i_unverified_entry; }
505 void relocate(address new_base);
506 #ifndef PRODUCT
507 void print();
508 #endif /* PRODUCT */
509 };
510
511
512 class AdapterHandlerLibrary: public AllStatic {
513 private:
514 enum {
515 AbstractMethodHandler = 1 // special handler for abstract methods
516 };
517 static GrowableArray<uint64_t>* _fingerprints; // the fingerprint collection
518 static GrowableArray<AdapterHandlerEntry*> * _handlers; // the corresponding handlers
519 static u_char _buffer[]; // the temporary code buffer
520 static void initialize();
521 static AdapterHandlerEntry* get_entry( int index ) { return _handlers->at(index); }
522 static int get_create_adapter_index(methodHandle method);
523 static address get_i2c_entry( int index ) { return get_entry(index)->get_i2c_entry(); }
524 static address get_c2i_entry( int index ) { return get_entry(index)->get_c2i_entry(); }
525 static address get_c2i_unverified_entry( int index ) { return get_entry(index)->get_c2i_unverified_entry(); }
526
527 public:
528 static nmethod* create_native_wrapper(methodHandle method);
529 static AdapterHandlerEntry* get_adapter(methodHandle method) { return get_entry(get_create_adapter_index(method)); }
530
531 #ifndef PRODUCT
532 static void print_handler(CodeBlob* b);
533 static bool contains(CodeBlob* b);
534 #endif /* PRODUCT */
535
536 };