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comparison src/share/vm/runtime/javaCalls.cpp @ 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 #include "incls/_precompiled.incl"
26 #include "incls/_javaCalls.cpp.incl"
27
28 // -----------------------------------------------------
29 // Implementation of JavaCallWrapper
30
31 JavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) {
32 JavaThread* thread = (JavaThread *)THREAD;
33 bool clear_pending_exception = true;
34
35 guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
36 assert(!thread->owns_locks(), "must release all locks when leaving VM");
37 guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler");
38 _result = result;
39
40 // Make sure that that the value of the higest_lock is at least the same as the current stackpointer,
41 // since, the Java code is highly likely to use locks.
42 // Use '(address)this' to guarantee that highest_lock address is conservative and inside our thread
43 thread->update_highest_lock((address)this);
44
45 // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub,
46 // since it can potentially block.
47 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
48
49 // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
50 // info, since we cannot find oops before the new information is set up completely.
51 ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java);
52
53 // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state
54 // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions
55 // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state).
56 if (thread->has_special_runtime_exit_condition()) {
57 thread->handle_special_runtime_exit_condition();
58 if (HAS_PENDING_EXCEPTION) {
59 clear_pending_exception = false;
60 }
61 }
62
63
64 // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
65 // the JavaCallWrapper before the entry frame is on the stack.
66 _callee_method = callee_method();
67 _receiver = receiver();
68
69 #ifdef CHECK_UNHANDLED_OOPS
70 THREAD->allow_unhandled_oop(&_callee_method);
71 THREAD->allow_unhandled_oop(&_receiver);
72 #endif // CHECK_UNHANDLED_OOPS
73
74 _thread = (JavaThread *)thread;
75 _handles = _thread->active_handles(); // save previous handle block & Java frame linkage
76
77 // For the profiler, the last_Java_frame information in thread must always be in
78 // legal state. We have no last Java frame if last_Java_sp == NULL so
79 // the valid transition is to clear _last_Java_sp and then reset the rest of
80 // the (platform specific) state.
81
82 _anchor.copy(_thread->frame_anchor());
83 _thread->frame_anchor()->clear();
84
85 debug_only(_thread->inc_java_call_counter());
86 _thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage
87
88 assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
89
90 // clear any pending exception in thread (native calls start with no exception pending)
91 if(clear_pending_exception) {
92 _thread->clear_pending_exception();
93 }
94
95 if (_anchor.last_Java_sp() == NULL) {
96 _thread->record_base_of_stack_pointer();
97 }
98 }
99
100
101 JavaCallWrapper::~JavaCallWrapper() {
102 assert(_thread == JavaThread::current(), "must still be the same thread");
103
104 // restore previous handle block & Java frame linkage
105 JNIHandleBlock *_old_handles = _thread->active_handles();
106 _thread->set_active_handles(_handles);
107
108 _thread->frame_anchor()->zap();
109
110 debug_only(_thread->dec_java_call_counter());
111
112 if (_anchor.last_Java_sp() == NULL) {
113 _thread->set_base_of_stack_pointer(NULL);
114 }
115
116
117 // Old thread-local info. has been restored. We are not back in the VM.
118 ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
119
120 // State has been restored now make the anchor frame visible for the profiler.
121 // Do this after the transition because this allows us to put an assert
122 // the Java->vm transition which checks to see that stack is not walkable
123 // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
124 // invariants (i.e. _flags always cleared on return to Java)
125
126 _thread->frame_anchor()->copy(&_anchor);
127
128 // Release handles after we are marked as being inside the VM again, since this
129 // operation might block
130 JNIHandleBlock::release_block(_old_handles, _thread);
131 }
132
133
134 void JavaCallWrapper::oops_do(OopClosure* f) {
135 f->do_oop((oop*)&_callee_method);
136 f->do_oop((oop*)&_receiver);
137 handles()->oops_do(f);
138 }
139
140
141 // Helper methods
142 static BasicType runtime_type_from(JavaValue* result) {
143 switch (result->get_type()) {
144 case T_BOOLEAN: // fall through
145 case T_CHAR : // fall through
146 case T_SHORT : // fall through
147 case T_INT : // fall through
148 #ifndef _LP64
149 case T_OBJECT : // fall through
150 case T_ARRAY : // fall through
151 #endif
152 case T_BYTE : // fall through
153 case T_VOID : return T_INT;
154 case T_LONG : return T_LONG;
155 case T_FLOAT : return T_FLOAT;
156 case T_DOUBLE : return T_DOUBLE;
157 #ifdef _LP64
158 case T_ARRAY : // fall through
159 case T_OBJECT: return T_OBJECT;
160 #endif
161 }
162 ShouldNotReachHere();
163 return T_ILLEGAL;
164 }
165
166 // ===== object constructor calls =====
167
168 void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) {
169 assert(method->name() == vmSymbols::object_initializer_name(), "Should only be called for default constructor");
170 assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor");
171
172 instanceKlass* ik = instanceKlass::cast(method->method_holder());
173 if (ik->is_initialized() && ik->has_vanilla_constructor()) {
174 // safe to skip constructor call
175 } else {
176 static JavaValue result(T_VOID);
177 JavaCallArguments args(receiver);
178 call(&result, method, &args, CHECK);
179 }
180 }
181
182 // ============ Virtual calls ============
183
184 void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
185 CallInfo callinfo;
186 Handle receiver = args->receiver();
187 KlassHandle recvrKlass(THREAD, receiver.is_null() ? (klassOop)NULL : receiver->klass());
188 LinkResolver::resolve_virtual_call(
189 callinfo, receiver, recvrKlass, spec_klass, name, signature,
190 KlassHandle(), false, true, CHECK);
191 methodHandle method = callinfo.selected_method();
192 assert(method.not_null(), "should have thrown exception");
193
194 // Invoke the method
195 JavaCalls::call(result, method, args, CHECK);
196 }
197
198
199 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, TRAPS) {
200 JavaCallArguments args(receiver); // One oop argument
201 call_virtual(result, spec_klass, name, signature, &args, CHECK);
202 }
203
204
205 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
206 JavaCallArguments args(receiver); // One oop argument
207 args.push_oop(arg1);
208 call_virtual(result, spec_klass, name, signature, &args, CHECK);
209 }
210
211
212
213 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
214 JavaCallArguments args(receiver); // One oop argument
215 args.push_oop(arg1);
216 args.push_oop(arg2);
217 call_virtual(result, spec_klass, name, signature, &args, CHECK);
218 }
219
220
221 // ============ Special calls ============
222
223 void JavaCalls::call_special(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
224 CallInfo callinfo;
225 LinkResolver::resolve_special_call(callinfo, klass, name, signature, KlassHandle(), false, CHECK);
226 methodHandle method = callinfo.selected_method();
227 assert(method.not_null(), "should have thrown exception");
228
229 // Invoke the method
230 JavaCalls::call(result, method, args, CHECK);
231 }
232
233
234 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
235 JavaCallArguments args(receiver); // One oop argument
236 call_special(result, klass, name, signature, &args, CHECK);
237 }
238
239
240 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
241 JavaCallArguments args(receiver); // One oop argument
242 args.push_oop(arg1);
243 call_special(result, klass, name, signature, &args, CHECK);
244 }
245
246
247 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
248 JavaCallArguments args(receiver); // One oop argument
249 args.push_oop(arg1);
250 args.push_oop(arg2);
251 call_special(result, klass, name, signature, &args, CHECK);
252 }
253
254
255 // ============ Static calls ============
256
257 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
258 CallInfo callinfo;
259 LinkResolver::resolve_static_call(callinfo, klass, name, signature, KlassHandle(), false, true, CHECK);
260 methodHandle method = callinfo.selected_method();
261 assert(method.not_null(), "should have thrown exception");
262
263 // Invoke the method
264 JavaCalls::call(result, method, args, CHECK);
265 }
266
267
268 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
269 JavaCallArguments args; // No argument
270 call_static(result, klass, name, signature, &args, CHECK);
271 }
272
273
274 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
275 JavaCallArguments args(arg1); // One oop argument
276 call_static(result, klass, name, signature, &args, CHECK);
277 }
278
279
280 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
281 JavaCallArguments args; // One oop argument
282 args.push_oop(arg1);
283 args.push_oop(arg2);
284 call_static(result, klass, name, signature, &args, CHECK);
285 }
286
287
288 // -------------------------------------------------
289 // Implementation of JavaCalls (low level)
290
291
292 void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) {
293 // Check if we need to wrap a potential OS exception handler around thread
294 // This is used for e.g. Win32 structured exception handlers
295 assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
296 // Need to wrap each and everytime, since there might be native code down the
297 // stack that has installed its own exception handlers
298 os::os_exception_wrapper(call_helper, result, &method, args, THREAD);
299 }
300
301 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) {
302 methodHandle method = *m;
303 JavaThread* thread = (JavaThread*)THREAD;
304 assert(thread->is_Java_thread(), "must be called by a java thread");
305 assert(method.not_null(), "must have a method to call");
306 assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
307 assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
308
309
310 CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
311
312 // Make sure that the arguments have the right type
313 debug_only(args->verify(method, result->get_type(), thread));
314
315 // Ignore call if method is empty
316 if (method->is_empty_method()) {
317 assert(result->get_type() == T_VOID, "an empty method must return a void value");
318 return;
319 }
320
321
322 #ifdef ASSERT
323 { klassOop holder = method->method_holder();
324 // A klass might not be initialized since JavaCall's might be used during the executing of
325 // the <clinit>. For example, a Thread.start might start executing on an object that is
326 // not fully initialized! (bad Java programming style)
327 assert(instanceKlass::cast(holder)->is_linked(), "rewritting must have taken place");
328 }
329 #endif
330
331
332 assert(!thread->is_Compiler_thread(), "cannot compile from the compiler");
333 if (CompilationPolicy::mustBeCompiled(method)) {
334 CompileBroker::compile_method(method, InvocationEntryBci,
335 methodHandle(), 0, "mustBeCompiled", CHECK);
336 }
337
338 // Since the call stub sets up like the interpreter we call the from_interpreted_entry
339 // so we can go compiled via a i2c. Otherwise initial entry method will always
340 // run interpreted.
341 address entry_point = method->from_interpreted_entry();
342 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
343 entry_point = method->interpreter_entry();
344 }
345
346 // Figure out if the result value is an oop or not (Note: This is a different value
347 // than result_type. result_type will be T_INT of oops. (it is about size)
348 BasicType result_type = runtime_type_from(result);
349 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY);
350
351 // NOTE: if we move the computation of the result_val_address inside
352 // the call to call_stub, the optimizer produces wrong code.
353 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
354
355 // Find receiver
356 Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
357
358 // When we reenter Java, we need to reenable the yellow zone which
359 // might already be disabled when we are in VM.
360 if (thread->stack_yellow_zone_disabled()) {
361 thread->reguard_stack();
362 }
363
364 // Check that there are shadow pages available before changing thread state
365 // to Java
366 if (!os::stack_shadow_pages_available(THREAD, method)) {
367 // Throw stack overflow exception with preinitialized exception.
368 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__);
369 return;
370 } else {
371 // Touch pages checked if the OS needs them to be touched to be mapped.
372 os::bang_stack_shadow_pages();
373 }
374
375 // do call
376 { JavaCallWrapper link(method, receiver, result, CHECK);
377 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner
378
379 StubRoutines::call_stub()(
380 (address)&link,
381 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
382 result_val_address, // see NOTE above (compiler problem)
383 result_type,
384 method(),
385 entry_point,
386 args->parameters(),
387 args->size_of_parameters(),
388 CHECK
389 );
390
391 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
392 // Preserve oop return value across possible gc points
393 if (oop_result_flag) {
394 thread->set_vm_result((oop) result->get_jobject());
395 }
396 }
397 } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
398
399 // Check if a thread stop or suspend should be executed
400 // The following assert was not realistic. Thread.stop can set that bit at any moment.
401 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
402
403 // Restore possible oop return
404 if (oop_result_flag) {
405 result->set_jobject((jobject)thread->vm_result());
406 thread->set_vm_result(NULL);
407 }
408 }
409
410
411 //--------------------------------------------------------------------------------------
412 // Implementation of JavaCallArguments
413
414 intptr_t* JavaCallArguments::parameters() {
415 // First convert all handles to oops
416 for(int i = 0; i < _size; i++) {
417 if (_is_oop[i]) {
418 // Handle conversion
419 _value[i] = (intptr_t)Handle::raw_resolve((oop *)_value[i]);
420 }
421 // The parameters are moved to the parameters array to include the tags.
422 if (TaggedStackInterpreter) {
423 // Tags are interspersed with arguments. Tags are first.
424 int tagged_index = i*2;
425 _parameters[tagged_index] = _is_oop[i] ? frame::TagReference :
426 frame::TagValue;
427 _parameters[tagged_index+1] = _value[i];
428 }
429 }
430 // Return argument vector
431 return TaggedStackInterpreter ? _parameters : _value;
432 }
433
434 //--------------------------------------------------------------------------------------
435 // Non-Product code
436 #ifndef PRODUCT
437
438 class SignatureChekker : public SignatureIterator {
439 private:
440 bool *_is_oop;
441 int _pos;
442 BasicType _return_type;
443
444 public:
445 bool _is_return;
446
447 SignatureChekker(symbolHandle signature, BasicType return_type, bool is_static, bool* is_oop) : SignatureIterator(signature) {
448 _is_oop = is_oop;
449 _is_return = false;
450 _return_type = return_type;
451 _pos = 0;
452 if (!is_static) {
453 check_value(true); // Receiver must be an oop
454 }
455 }
456
457 void check_value(bool type) {
458 guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments");
459 }
460
461 void check_doing_return(bool state) { _is_return = state; }
462
463 void check_return_type(BasicType t) {
464 guarantee(_is_return && t == _return_type, "return type does not match");
465 }
466
467 void check_int(BasicType t) {
468 if (_is_return) {
469 check_return_type(t);
470 return;
471 }
472 check_value(false);
473 }
474
475 void check_double(BasicType t) { check_long(t); }
476
477 void check_long(BasicType t) {
478 if (_is_return) {
479 check_return_type(t);
480 return;
481 }
482
483 check_value(false);
484 check_value(false);
485 }
486
487 void check_obj(BasicType t) {
488 if (_is_return) {
489 check_return_type(t);
490 return;
491 }
492 check_value(true);
493 }
494
495 void do_bool() { check_int(T_BOOLEAN); }
496 void do_char() { check_int(T_CHAR); }
497 void do_float() { check_int(T_FLOAT); }
498 void do_double() { check_double(T_DOUBLE); }
499 void do_byte() { check_int(T_BYTE); }
500 void do_short() { check_int(T_SHORT); }
501 void do_int() { check_int(T_INT); }
502 void do_long() { check_long(T_LONG); }
503 void do_void() { check_return_type(T_VOID); }
504 void do_object(int begin, int end) { check_obj(T_OBJECT); }
505 void do_array(int begin, int end) { check_obj(T_OBJECT); }
506 };
507
508 void JavaCallArguments::verify(methodHandle method, BasicType return_type,
509 Thread *thread) {
510 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
511
512 // Treat T_OBJECT and T_ARRAY as the same
513 if (return_type == T_ARRAY) return_type = T_OBJECT;
514
515 // Check that oop information is correct
516 symbolHandle signature (thread, method->signature());
517
518 SignatureChekker sc(signature, return_type, method->is_static(),_is_oop);
519 sc.iterate_parameters();
520 sc.check_doing_return(true);
521 sc.iterate_returntype();
522 }
523
524 #endif // PRODUCT