javaCalls.cpp revision 579:0fbdb4381b99
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 */ 24 25#include "incls/_precompiled.incl" 26#include "incls/_javaCalls.cpp.incl" 27 28// ----------------------------------------------------- 29// Implementation of JavaCallWrapper 30 31JavaCallWrapper::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 101JavaCallWrapper::~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 134void 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 142static 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 168void 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 184void 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 199void 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 205void 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 213void 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 223void 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 234void 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 240void 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 247void 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 257void 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 268void 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 274void 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 280void 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 292void 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 301void 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 // Verify the arguments 313 314 if (CheckJNICalls) { 315 args->verify(method, result->get_type(), thread); 316 } 317 else debug_only(args->verify(method, result->get_type(), thread)); 318 319 // Ignore call if method is empty 320 if (method->is_empty_method()) { 321 assert(result->get_type() == T_VOID, "an empty method must return a void value"); 322 return; 323 } 324 325 326#ifdef ASSERT 327 { klassOop holder = method->method_holder(); 328 // A klass might not be initialized since JavaCall's might be used during the executing of 329 // the <clinit>. For example, a Thread.start might start executing on an object that is 330 // not fully initialized! (bad Java programming style) 331 assert(instanceKlass::cast(holder)->is_linked(), "rewritting must have taken place"); 332 } 333#endif 334 335 336 assert(!thread->is_Compiler_thread(), "cannot compile from the compiler"); 337 if (CompilationPolicy::mustBeCompiled(method)) { 338 CompileBroker::compile_method(method, InvocationEntryBci, 339 methodHandle(), 0, "mustBeCompiled", CHECK); 340 } 341 342 // Since the call stub sets up like the interpreter we call the from_interpreted_entry 343 // so we can go compiled via a i2c. Otherwise initial entry method will always 344 // run interpreted. 345 address entry_point = method->from_interpreted_entry(); 346 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { 347 entry_point = method->interpreter_entry(); 348 } 349 350 // Figure out if the result value is an oop or not (Note: This is a different value 351 // than result_type. result_type will be T_INT of oops. (it is about size) 352 BasicType result_type = runtime_type_from(result); 353 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY); 354 355 // NOTE: if we move the computation of the result_val_address inside 356 // the call to call_stub, the optimizer produces wrong code. 357 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr()); 358 359 // Find receiver 360 Handle receiver = (!method->is_static()) ? args->receiver() : Handle(); 361 362 // When we reenter Java, we need to reenable the yellow zone which 363 // might already be disabled when we are in VM. 364 if (thread->stack_yellow_zone_disabled()) { 365 thread->reguard_stack(); 366 } 367 368 // Check that there are shadow pages available before changing thread state 369 // to Java 370 if (!os::stack_shadow_pages_available(THREAD, method)) { 371 // Throw stack overflow exception with preinitialized exception. 372 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__); 373 return; 374 } else { 375 // Touch pages checked if the OS needs them to be touched to be mapped. 376 os::bang_stack_shadow_pages(); 377 } 378 379 // do call 380 { JavaCallWrapper link(method, receiver, result, CHECK); 381 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner 382 383 StubRoutines::call_stub()( 384 (address)&link, 385 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem) 386 result_val_address, // see NOTE above (compiler problem) 387 result_type, 388 method(), 389 entry_point, 390 args->parameters(), 391 args->size_of_parameters(), 392 CHECK 393 ); 394 395 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call) 396 // Preserve oop return value across possible gc points 397 if (oop_result_flag) { 398 thread->set_vm_result((oop) result->get_jobject()); 399 } 400 } 401 } // Exit JavaCallWrapper (can block - potential return oop must be preserved) 402 403 // Check if a thread stop or suspend should be executed 404 // The following assert was not realistic. Thread.stop can set that bit at any moment. 405 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed"); 406 407 // Restore possible oop return 408 if (oop_result_flag) { 409 result->set_jobject((jobject)thread->vm_result()); 410 thread->set_vm_result(NULL); 411 } 412} 413 414 415//-------------------------------------------------------------------------------------- 416// Implementation of JavaCallArguments 417 418intptr_t* JavaCallArguments::parameters() { 419 // First convert all handles to oops 420 for(int i = 0; i < _size; i++) { 421 if (_is_oop[i]) { 422 // Handle conversion 423 _value[i] = (intptr_t)Handle::raw_resolve((oop *)_value[i]); 424 } 425 // The parameters are moved to the parameters array to include the tags. 426 if (TaggedStackInterpreter) { 427 // Tags are interspersed with arguments. Tags are first. 428 int tagged_index = i*2; 429 _parameters[tagged_index] = _is_oop[i] ? frame::TagReference : 430 frame::TagValue; 431 _parameters[tagged_index+1] = _value[i]; 432 } 433 } 434 // Return argument vector 435 return TaggedStackInterpreter ? _parameters : _value; 436} 437 438 439class SignatureChekker : public SignatureIterator { 440 private: 441 bool *_is_oop; 442 int _pos; 443 BasicType _return_type; 444 intptr_t* _value; 445 Thread* _thread; 446 447 public: 448 bool _is_return; 449 450 SignatureChekker(symbolHandle signature, BasicType return_type, bool is_static, bool* is_oop, intptr_t* value, Thread* thread) : SignatureIterator(signature) { 451 _is_oop = is_oop; 452 _is_return = false; 453 _return_type = return_type; 454 _pos = 0; 455 _value = value; 456 _thread = thread; 457 458 if (!is_static) { 459 check_value(true); // Receiver must be an oop 460 } 461 } 462 463 void check_value(bool type) { 464 guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments"); 465 } 466 467 void check_doing_return(bool state) { _is_return = state; } 468 469 void check_return_type(BasicType t) { 470 guarantee(_is_return && t == _return_type, "return type does not match"); 471 } 472 473 void check_int(BasicType t) { 474 if (_is_return) { 475 check_return_type(t); 476 return; 477 } 478 check_value(false); 479 } 480 481 void check_double(BasicType t) { check_long(t); } 482 483 void check_long(BasicType t) { 484 if (_is_return) { 485 check_return_type(t); 486 return; 487 } 488 489 check_value(false); 490 check_value(false); 491 } 492 493 void check_obj(BasicType t) { 494 if (_is_return) { 495 check_return_type(t); 496 return; 497 } 498 499 // verify handle and the oop pointed to by handle 500 int p = _pos; 501 bool bad = false; 502 // If argument is oop 503 if (_is_oop[p]) { 504 intptr_t v = _value[p]; 505 if (v != 0 ) { 506 size_t t = (size_t)v; 507 bad = (t < (size_t)os::vm_page_size() ) || !Handle::raw_resolve((oop *)v)->is_oop_or_null(true); 508 if (CheckJNICalls && bad) { 509 ReportJNIFatalError((JavaThread*)_thread, "Bad JNI oop argument"); 510 } 511 } 512 // for the regular debug case. 513 assert(!bad, "Bad JNI oop argument"); 514 } 515 516 check_value(true); 517 } 518 519 void do_bool() { check_int(T_BOOLEAN); } 520 void do_char() { check_int(T_CHAR); } 521 void do_float() { check_int(T_FLOAT); } 522 void do_double() { check_double(T_DOUBLE); } 523 void do_byte() { check_int(T_BYTE); } 524 void do_short() { check_int(T_SHORT); } 525 void do_int() { check_int(T_INT); } 526 void do_long() { check_long(T_LONG); } 527 void do_void() { check_return_type(T_VOID); } 528 void do_object(int begin, int end) { check_obj(T_OBJECT); } 529 void do_array(int begin, int end) { check_obj(T_OBJECT); } 530}; 531 532 533void JavaCallArguments::verify(methodHandle method, BasicType return_type, 534 Thread *thread) { 535 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed"); 536 537 // Treat T_OBJECT and T_ARRAY as the same 538 if (return_type == T_ARRAY) return_type = T_OBJECT; 539 540 // Check that oop information is correct 541 symbolHandle signature (thread, method->signature()); 542 543 SignatureChekker sc(signature, return_type, method->is_static(),_is_oop, _value, thread); 544 sc.iterate_parameters(); 545 sc.check_doing_return(true); 546 sc.iterate_returntype(); 547} 548 549