Tue, 07 Jul 2009 14:23:00 -0400
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
Summary: Changing the behavior of -XX:+PrintHeapAtGC for G1 from printing lengthy, per-region information to instead printing a concise summary.
Reviewed-by: ysr, apetrusenko, jcoomes
1 /*
2 * Copyright 1997-2009 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 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_javaCalls.cpp.incl"
28 // -----------------------------------------------------
29 // Implementation of JavaCallWrapper
31 JavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) {
32 JavaThread* thread = (JavaThread *)THREAD;
33 bool clear_pending_exception = true;
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;
40 // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub,
41 // since it can potentially block.
42 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
44 // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
45 // info, since we cannot find oops before the new information is set up completely.
46 ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java);
48 // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state
49 // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions
50 // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state).
51 if (thread->has_special_runtime_exit_condition()) {
52 thread->handle_special_runtime_exit_condition();
53 if (HAS_PENDING_EXCEPTION) {
54 clear_pending_exception = false;
55 }
56 }
59 // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
60 // the JavaCallWrapper before the entry frame is on the stack.
61 _callee_method = callee_method();
62 _receiver = receiver();
64 #ifdef CHECK_UNHANDLED_OOPS
65 THREAD->allow_unhandled_oop(&_callee_method);
66 THREAD->allow_unhandled_oop(&_receiver);
67 #endif // CHECK_UNHANDLED_OOPS
69 _thread = (JavaThread *)thread;
70 _handles = _thread->active_handles(); // save previous handle block & Java frame linkage
72 // For the profiler, the last_Java_frame information in thread must always be in
73 // legal state. We have no last Java frame if last_Java_sp == NULL so
74 // the valid transition is to clear _last_Java_sp and then reset the rest of
75 // the (platform specific) state.
77 _anchor.copy(_thread->frame_anchor());
78 _thread->frame_anchor()->clear();
80 debug_only(_thread->inc_java_call_counter());
81 _thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage
83 assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
85 // clear any pending exception in thread (native calls start with no exception pending)
86 if(clear_pending_exception) {
87 _thread->clear_pending_exception();
88 }
90 if (_anchor.last_Java_sp() == NULL) {
91 _thread->record_base_of_stack_pointer();
92 }
93 }
96 JavaCallWrapper::~JavaCallWrapper() {
97 assert(_thread == JavaThread::current(), "must still be the same thread");
99 // restore previous handle block & Java frame linkage
100 JNIHandleBlock *_old_handles = _thread->active_handles();
101 _thread->set_active_handles(_handles);
103 _thread->frame_anchor()->zap();
105 debug_only(_thread->dec_java_call_counter());
107 if (_anchor.last_Java_sp() == NULL) {
108 _thread->set_base_of_stack_pointer(NULL);
109 }
112 // Old thread-local info. has been restored. We are not back in the VM.
113 ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
115 // State has been restored now make the anchor frame visible for the profiler.
116 // Do this after the transition because this allows us to put an assert
117 // the Java->vm transition which checks to see that stack is not walkable
118 // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
119 // invariants (i.e. _flags always cleared on return to Java)
121 _thread->frame_anchor()->copy(&_anchor);
123 // Release handles after we are marked as being inside the VM again, since this
124 // operation might block
125 JNIHandleBlock::release_block(_old_handles, _thread);
126 }
129 void JavaCallWrapper::oops_do(OopClosure* f) {
130 f->do_oop((oop*)&_callee_method);
131 f->do_oop((oop*)&_receiver);
132 handles()->oops_do(f);
133 }
136 // Helper methods
137 static BasicType runtime_type_from(JavaValue* result) {
138 switch (result->get_type()) {
139 case T_BOOLEAN: // fall through
140 case T_CHAR : // fall through
141 case T_SHORT : // fall through
142 case T_INT : // fall through
143 #ifndef _LP64
144 case T_OBJECT : // fall through
145 case T_ARRAY : // fall through
146 #endif
147 case T_BYTE : // fall through
148 case T_VOID : return T_INT;
149 case T_LONG : return T_LONG;
150 case T_FLOAT : return T_FLOAT;
151 case T_DOUBLE : return T_DOUBLE;
152 #ifdef _LP64
153 case T_ARRAY : // fall through
154 case T_OBJECT: return T_OBJECT;
155 #endif
156 }
157 ShouldNotReachHere();
158 return T_ILLEGAL;
159 }
161 // ===== object constructor calls =====
163 void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) {
164 assert(method->name() == vmSymbols::object_initializer_name(), "Should only be called for default constructor");
165 assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor");
167 instanceKlass* ik = instanceKlass::cast(method->method_holder());
168 if (ik->is_initialized() && ik->has_vanilla_constructor()) {
169 // safe to skip constructor call
170 } else {
171 static JavaValue result(T_VOID);
172 JavaCallArguments args(receiver);
173 call(&result, method, &args, CHECK);
174 }
175 }
177 // ============ Virtual calls ============
179 void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
180 CallInfo callinfo;
181 Handle receiver = args->receiver();
182 KlassHandle recvrKlass(THREAD, receiver.is_null() ? (klassOop)NULL : receiver->klass());
183 LinkResolver::resolve_virtual_call(
184 callinfo, receiver, recvrKlass, spec_klass, name, signature,
185 KlassHandle(), false, true, CHECK);
186 methodHandle method = callinfo.selected_method();
187 assert(method.not_null(), "should have thrown exception");
189 // Invoke the method
190 JavaCalls::call(result, method, args, CHECK);
191 }
194 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, TRAPS) {
195 JavaCallArguments args(receiver); // One oop argument
196 call_virtual(result, spec_klass, name, signature, &args, CHECK);
197 }
200 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
201 JavaCallArguments args(receiver); // One oop argument
202 args.push_oop(arg1);
203 call_virtual(result, spec_klass, name, signature, &args, CHECK);
204 }
208 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
209 JavaCallArguments args(receiver); // One oop argument
210 args.push_oop(arg1);
211 args.push_oop(arg2);
212 call_virtual(result, spec_klass, name, signature, &args, CHECK);
213 }
216 // ============ Special calls ============
218 void JavaCalls::call_special(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
219 CallInfo callinfo;
220 LinkResolver::resolve_special_call(callinfo, klass, name, signature, KlassHandle(), false, CHECK);
221 methodHandle method = callinfo.selected_method();
222 assert(method.not_null(), "should have thrown exception");
224 // Invoke the method
225 JavaCalls::call(result, method, args, CHECK);
226 }
229 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
230 JavaCallArguments args(receiver); // One oop argument
231 call_special(result, klass, name, signature, &args, CHECK);
232 }
235 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
236 JavaCallArguments args(receiver); // One oop argument
237 args.push_oop(arg1);
238 call_special(result, klass, name, signature, &args, CHECK);
239 }
242 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
243 JavaCallArguments args(receiver); // One oop argument
244 args.push_oop(arg1);
245 args.push_oop(arg2);
246 call_special(result, klass, name, signature, &args, CHECK);
247 }
250 // ============ Static calls ============
252 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
253 CallInfo callinfo;
254 LinkResolver::resolve_static_call(callinfo, klass, name, signature, KlassHandle(), false, true, CHECK);
255 methodHandle method = callinfo.selected_method();
256 assert(method.not_null(), "should have thrown exception");
258 // Invoke the method
259 JavaCalls::call(result, method, args, CHECK);
260 }
263 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
264 JavaCallArguments args; // No argument
265 call_static(result, klass, name, signature, &args, CHECK);
266 }
269 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
270 JavaCallArguments args(arg1); // One oop argument
271 call_static(result, klass, name, signature, &args, CHECK);
272 }
275 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
276 JavaCallArguments args; // One oop argument
277 args.push_oop(arg1);
278 args.push_oop(arg2);
279 call_static(result, klass, name, signature, &args, CHECK);
280 }
283 // -------------------------------------------------
284 // Implementation of JavaCalls (low level)
287 void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) {
288 // Check if we need to wrap a potential OS exception handler around thread
289 // This is used for e.g. Win32 structured exception handlers
290 assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
291 // Need to wrap each and everytime, since there might be native code down the
292 // stack that has installed its own exception handlers
293 os::os_exception_wrapper(call_helper, result, &method, args, THREAD);
294 }
296 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) {
297 methodHandle method = *m;
298 JavaThread* thread = (JavaThread*)THREAD;
299 assert(thread->is_Java_thread(), "must be called by a java thread");
300 assert(method.not_null(), "must have a method to call");
301 assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
302 assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
305 CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
307 // Verify the arguments
309 if (CheckJNICalls) {
310 args->verify(method, result->get_type(), thread);
311 }
312 else debug_only(args->verify(method, result->get_type(), thread));
314 // Ignore call if method is empty
315 if (method->is_empty_method()) {
316 assert(result->get_type() == T_VOID, "an empty method must return a void value");
317 return;
318 }
321 #ifdef ASSERT
322 { klassOop holder = method->method_holder();
323 // A klass might not be initialized since JavaCall's might be used during the executing of
324 // the <clinit>. For example, a Thread.start might start executing on an object that is
325 // not fully initialized! (bad Java programming style)
326 assert(instanceKlass::cast(holder)->is_linked(), "rewritting must have taken place");
327 }
328 #endif
331 assert(!thread->is_Compiler_thread(), "cannot compile from the compiler");
332 if (CompilationPolicy::mustBeCompiled(method)) {
333 CompileBroker::compile_method(method, InvocationEntryBci,
334 methodHandle(), 0, "mustBeCompiled", CHECK);
335 }
337 // Since the call stub sets up like the interpreter we call the from_interpreted_entry
338 // so we can go compiled via a i2c. Otherwise initial entry method will always
339 // run interpreted.
340 address entry_point = method->from_interpreted_entry();
341 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
342 entry_point = method->interpreter_entry();
343 }
345 // Figure out if the result value is an oop or not (Note: This is a different value
346 // than result_type. result_type will be T_INT of oops. (it is about size)
347 BasicType result_type = runtime_type_from(result);
348 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY);
350 // NOTE: if we move the computation of the result_val_address inside
351 // the call to call_stub, the optimizer produces wrong code.
352 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
354 // Find receiver
355 Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
357 // When we reenter Java, we need to reenable the yellow zone which
358 // might already be disabled when we are in VM.
359 if (thread->stack_yellow_zone_disabled()) {
360 thread->reguard_stack();
361 }
363 // Check that there are shadow pages available before changing thread state
364 // to Java
365 if (!os::stack_shadow_pages_available(THREAD, method)) {
366 // Throw stack overflow exception with preinitialized exception.
367 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__);
368 return;
369 } else {
370 // Touch pages checked if the OS needs them to be touched to be mapped.
371 os::bang_stack_shadow_pages();
372 }
374 // do call
375 { JavaCallWrapper link(method, receiver, result, CHECK);
376 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner
378 StubRoutines::call_stub()(
379 (address)&link,
380 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
381 result_val_address, // see NOTE above (compiler problem)
382 result_type,
383 method(),
384 entry_point,
385 args->parameters(),
386 args->size_of_parameters(),
387 CHECK
388 );
390 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
391 // Preserve oop return value across possible gc points
392 if (oop_result_flag) {
393 thread->set_vm_result((oop) result->get_jobject());
394 }
395 }
396 } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
398 // Check if a thread stop or suspend should be executed
399 // The following assert was not realistic. Thread.stop can set that bit at any moment.
400 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
402 // Restore possible oop return
403 if (oop_result_flag) {
404 result->set_jobject((jobject)thread->vm_result());
405 thread->set_vm_result(NULL);
406 }
407 }
410 //--------------------------------------------------------------------------------------
411 // Implementation of JavaCallArguments
413 intptr_t* JavaCallArguments::parameters() {
414 // First convert all handles to oops
415 for(int i = 0; i < _size; i++) {
416 if (_is_oop[i]) {
417 // Handle conversion
418 _value[i] = (intptr_t)Handle::raw_resolve((oop *)_value[i]);
419 }
420 // The parameters are moved to the parameters array to include the tags.
421 if (TaggedStackInterpreter) {
422 // Tags are interspersed with arguments. Tags are first.
423 int tagged_index = i*2;
424 _parameters[tagged_index] = _is_oop[i] ? frame::TagReference :
425 frame::TagValue;
426 _parameters[tagged_index+1] = _value[i];
427 }
428 }
429 // Return argument vector
430 return TaggedStackInterpreter ? _parameters : _value;
431 }
434 class SignatureChekker : public SignatureIterator {
435 private:
436 bool *_is_oop;
437 int _pos;
438 BasicType _return_type;
439 intptr_t* _value;
440 Thread* _thread;
442 public:
443 bool _is_return;
445 SignatureChekker(symbolHandle signature, BasicType return_type, bool is_static, bool* is_oop, intptr_t* value, Thread* thread) : SignatureIterator(signature) {
446 _is_oop = is_oop;
447 _is_return = false;
448 _return_type = return_type;
449 _pos = 0;
450 _value = value;
451 _thread = thread;
453 if (!is_static) {
454 check_value(true); // Receiver must be an oop
455 }
456 }
458 void check_value(bool type) {
459 guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments");
460 }
462 void check_doing_return(bool state) { _is_return = state; }
464 void check_return_type(BasicType t) {
465 guarantee(_is_return && t == _return_type, "return type does not match");
466 }
468 void check_int(BasicType t) {
469 if (_is_return) {
470 check_return_type(t);
471 return;
472 }
473 check_value(false);
474 }
476 void check_double(BasicType t) { check_long(t); }
478 void check_long(BasicType t) {
479 if (_is_return) {
480 check_return_type(t);
481 return;
482 }
484 check_value(false);
485 check_value(false);
486 }
488 void check_obj(BasicType t) {
489 if (_is_return) {
490 check_return_type(t);
491 return;
492 }
494 // verify handle and the oop pointed to by handle
495 int p = _pos;
496 bool bad = false;
497 // If argument is oop
498 if (_is_oop[p]) {
499 intptr_t v = _value[p];
500 if (v != 0 ) {
501 size_t t = (size_t)v;
502 bad = (t < (size_t)os::vm_page_size() ) || !Handle::raw_resolve((oop *)v)->is_oop_or_null(true);
503 if (CheckJNICalls && bad) {
504 ReportJNIFatalError((JavaThread*)_thread, "Bad JNI oop argument");
505 }
506 }
507 // for the regular debug case.
508 assert(!bad, "Bad JNI oop argument");
509 }
511 check_value(true);
512 }
514 void do_bool() { check_int(T_BOOLEAN); }
515 void do_char() { check_int(T_CHAR); }
516 void do_float() { check_int(T_FLOAT); }
517 void do_double() { check_double(T_DOUBLE); }
518 void do_byte() { check_int(T_BYTE); }
519 void do_short() { check_int(T_SHORT); }
520 void do_int() { check_int(T_INT); }
521 void do_long() { check_long(T_LONG); }
522 void do_void() { check_return_type(T_VOID); }
523 void do_object(int begin, int end) { check_obj(T_OBJECT); }
524 void do_array(int begin, int end) { check_obj(T_OBJECT); }
525 };
528 void JavaCallArguments::verify(methodHandle method, BasicType return_type,
529 Thread *thread) {
530 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
532 // Treat T_OBJECT and T_ARRAY as the same
533 if (return_type == T_ARRAY) return_type = T_OBJECT;
535 // Check that oop information is correct
536 symbolHandle signature (thread, method->signature());
538 SignatureChekker sc(signature, return_type, method->is_static(),_is_oop, _value, thread);
539 sc.iterate_parameters();
540 sc.check_doing_return(true);
541 sc.iterate_returntype();
542 }