1 /* 2 * Copyright (c) 1997, 2011, 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 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "code/nmethod.hpp" 29 #include "compiler/compileBroker.hpp" 30 #include "interpreter/interpreter.hpp" 31 #include "interpreter/linkResolver.hpp" 32 #include "memory/universe.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/jniCheck.hpp" 35 #include "runtime/compilationPolicy.hpp" 36 #include "runtime/handles.inline.hpp" 37 #include "runtime/interfaceSupport.hpp" 38 #include "runtime/javaCalls.hpp" 39 #include "runtime/mutexLocker.hpp" 40 #include "runtime/signature.hpp" 41 #include "runtime/stubRoutines.hpp" 42 #ifdef TARGET_OS_FAMILY_linux 43 # include "thread_linux.inline.hpp" 44 #endif 45 #ifdef TARGET_OS_FAMILY_solaris 46 # include "thread_solaris.inline.hpp" 47 #endif 48 #ifdef TARGET_OS_FAMILY_windows 49 # include "thread_windows.inline.hpp" 50 #endif 51 52 // ----------------------------------------------------- 53 // Implementation of JavaCallWrapper 54 55 JavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) { 56 JavaThread* thread = (JavaThread *)THREAD; 57 bool clear_pending_exception = true; 58 59 guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code"); 60 assert(!thread->owns_locks(), "must release all locks when leaving VM"); 61 guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler"); 62 _result = result; 63 64 // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub, 65 // since it can potentially block. 66 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread); 67 68 // After this, we are official in JavaCode. This needs to be done before we change any of the thread local 69 // info, since we cannot find oops before the new information is set up completely. 70 ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java); 71 72 // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state 73 // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions 74 // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state). 75 if (thread->has_special_runtime_exit_condition()) { 76 thread->handle_special_runtime_exit_condition(); 77 if (HAS_PENDING_EXCEPTION) { 78 clear_pending_exception = false; 79 } 80 } 81 82 83 // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing 84 // the JavaCallWrapper before the entry frame is on the stack. 85 _callee_method = callee_method(); 86 _receiver = receiver(); 87 88 #ifdef CHECK_UNHANDLED_OOPS 89 THREAD->allow_unhandled_oop(&_callee_method); 90 THREAD->allow_unhandled_oop(&_receiver); 91 #endif // CHECK_UNHANDLED_OOPS 92 93 _thread = (JavaThread *)thread; 94 _handles = _thread->active_handles(); // save previous handle block & Java frame linkage 95 96 // For the profiler, the last_Java_frame information in thread must always be in 97 // legal state. We have no last Java frame if last_Java_sp == NULL so 98 // the valid transition is to clear _last_Java_sp and then reset the rest of 99 // the (platform specific) state. 100 101 _anchor.copy(_thread->frame_anchor()); 102 _thread->frame_anchor()->clear(); 103 104 debug_only(_thread->inc_java_call_counter()); 105 _thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage 106 107 assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL"); 108 109 // clear any pending exception in thread (native calls start with no exception pending) 110 if(clear_pending_exception) { 111 _thread->clear_pending_exception(); 112 } 113 114 if (_anchor.last_Java_sp() == NULL) { 115 _thread->record_base_of_stack_pointer(); 116 } 117 } 118 119 120 JavaCallWrapper::~JavaCallWrapper() { 121 assert(_thread == JavaThread::current(), "must still be the same thread"); 122 123 // restore previous handle block & Java frame linkage 124 JNIHandleBlock *_old_handles = _thread->active_handles(); 125 _thread->set_active_handles(_handles); 126 127 _thread->frame_anchor()->zap(); 128 129 debug_only(_thread->dec_java_call_counter()); 130 131 if (_anchor.last_Java_sp() == NULL) { 132 _thread->set_base_of_stack_pointer(NULL); 133 } 134 135 136 // Old thread-local info. has been restored. We are not back in the VM. 137 ThreadStateTransition::transition_from_java(_thread, _thread_in_vm); 138 139 // State has been restored now make the anchor frame visible for the profiler. 140 // Do this after the transition because this allows us to put an assert 141 // the Java->vm transition which checks to see that stack is not walkable 142 // on sparc/ia64 which will catch violations of the reseting of last_Java_frame 143 // invariants (i.e. _flags always cleared on return to Java) 144 145 _thread->frame_anchor()->copy(&_anchor); 146 147 // Release handles after we are marked as being inside the VM again, since this 148 // operation might block 149 JNIHandleBlock::release_block(_old_handles, _thread); 150 } 151 152 153 void JavaCallWrapper::oops_do(OopClosure* f) { 154 f->do_oop((oop*)&_callee_method); 155 f->do_oop((oop*)&_receiver); 156 handles()->oops_do(f); 157 } 158 159 160 // Helper methods 161 static BasicType runtime_type_from(JavaValue* result) { 162 switch (result->get_type()) { 163 case T_BOOLEAN: // fall through 164 case T_CHAR : // fall through 165 case T_SHORT : // fall through 166 case T_INT : // fall through 167 #ifndef _LP64 168 case T_OBJECT : // fall through 169 case T_ARRAY : // fall through 170 #endif 171 case T_BYTE : // fall through 172 case T_VOID : return T_INT; 173 case T_LONG : return T_LONG; 174 case T_FLOAT : return T_FLOAT; 175 case T_DOUBLE : return T_DOUBLE; 176 #ifdef _LP64 177 case T_ARRAY : // fall through 178 case T_OBJECT: return T_OBJECT; 179 #endif 180 } 181 ShouldNotReachHere(); 182 return T_ILLEGAL; 183 } 184 185 // ===== object constructor calls ===== 186 187 void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) { 188 assert(method->name() == vmSymbols::object_initializer_name(), "Should only be called for default constructor"); 189 assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor"); 190 191 instanceKlass* ik = instanceKlass::cast(method->method_holder()); 192 if (ik->is_initialized() && ik->has_vanilla_constructor()) { 193 // safe to skip constructor call 194 } else { 195 static JavaValue result(T_VOID); 196 JavaCallArguments args(receiver); 197 call(&result, method, &args, CHECK); 198 } 199 } 200 201 // ============ Virtual calls ============ 202 203 void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 204 CallInfo callinfo; 205 Handle receiver = args->receiver(); 206 KlassHandle recvrKlass(THREAD, receiver.is_null() ? (klassOop)NULL : receiver->klass()); 207 LinkResolver::resolve_virtual_call( 208 callinfo, receiver, recvrKlass, spec_klass, name, signature, 209 KlassHandle(), false, true, CHECK); 210 methodHandle method = callinfo.selected_method(); 211 assert(method.not_null(), "should have thrown exception"); 212 213 // Invoke the method 214 JavaCalls::call(result, method, args, CHECK); 215 } 216 217 218 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, TRAPS) { 219 JavaCallArguments args(receiver); // One oop argument 220 call_virtual(result, spec_klass, name, signature, &args, CHECK); 221 } 222 223 224 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { 225 JavaCallArguments args(receiver); // One oop argument 226 args.push_oop(arg1); 227 call_virtual(result, spec_klass, name, signature, &args, CHECK); 228 } 229 230 231 232 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { 233 JavaCallArguments args(receiver); // One oop argument 234 args.push_oop(arg1); 235 args.push_oop(arg2); 236 call_virtual(result, spec_klass, name, signature, &args, CHECK); 237 } 238 239 240 // ============ Special calls ============ 241 242 void JavaCalls::call_special(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 243 CallInfo callinfo; 244 LinkResolver::resolve_special_call(callinfo, klass, name, signature, KlassHandle(), false, CHECK); 245 methodHandle method = callinfo.selected_method(); 246 assert(method.not_null(), "should have thrown exception"); 247 248 // Invoke the method 249 JavaCalls::call(result, method, args, CHECK); 250 } 251 252 253 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { 254 JavaCallArguments args(receiver); // One oop argument 255 call_special(result, klass, name, signature, &args, CHECK); 256 } 257 258 259 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { 260 JavaCallArguments args(receiver); // One oop argument 261 args.push_oop(arg1); 262 call_special(result, klass, name, signature, &args, CHECK); 263 } 264 265 266 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { 267 JavaCallArguments args(receiver); // One oop argument 268 args.push_oop(arg1); 269 args.push_oop(arg2); 270 call_special(result, klass, name, signature, &args, CHECK); 271 } 272 273 274 // ============ Static calls ============ 275 276 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 277 CallInfo callinfo; 278 LinkResolver::resolve_static_call(callinfo, klass, name, signature, KlassHandle(), false, true, CHECK); 279 methodHandle method = callinfo.selected_method(); 280 assert(method.not_null(), "should have thrown exception"); 281 282 // Invoke the method 283 JavaCalls::call(result, method, args, CHECK); 284 } 285 286 287 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { 288 JavaCallArguments args; // No argument 289 call_static(result, klass, name, signature, &args, CHECK); 290 } 291 292 293 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { 294 JavaCallArguments args(arg1); // One oop argument 295 call_static(result, klass, name, signature, &args, CHECK); 296 } 297 298 299 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { 300 JavaCallArguments args; // One oop argument 301 args.push_oop(arg1); 302 args.push_oop(arg2); 303 call_static(result, klass, name, signature, &args, CHECK); 304 } 305 306 307 // ------------------------------------------------- 308 // Implementation of JavaCalls (low level) 309 310 311 void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) { 312 // Check if we need to wrap a potential OS exception handler around thread 313 // This is used for e.g. Win32 structured exception handlers 314 assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls"); 315 // Need to wrap each and everytime, since there might be native code down the 316 // stack that has installed its own exception handlers 317 os::os_exception_wrapper(call_helper, result, &method, args, THREAD); 318 } 319 320 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) { 321 methodHandle method = *m; 322 JavaThread* thread = (JavaThread*)THREAD; 323 assert(thread->is_Java_thread(), "must be called by a java thread"); 324 assert(method.not_null(), "must have a method to call"); 325 assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation"); 326 assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here"); 327 328 329 CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();) 330 331 // Verify the arguments 332 333 if (CheckJNICalls) { 334 args->verify(method, result->get_type(), thread); 335 } 336 else debug_only(args->verify(method, result->get_type(), thread)); 337 338 // Ignore call if method is empty 339 if (method->is_empty_method()) { 340 assert(result->get_type() == T_VOID, "an empty method must return a void value"); 341 return; 342 } 343 344 345 #ifdef ASSERT 346 { klassOop holder = method->method_holder(); 347 // A klass might not be initialized since JavaCall's might be used during the executing of 348 // the <clinit>. For example, a Thread.start might start executing on an object that is 349 // not fully initialized! (bad Java programming style) 350 assert(instanceKlass::cast(holder)->is_linked(), "rewritting must have taken place"); 351 } 352 #endif 353 354 355 assert(!thread->is_Compiler_thread(), "cannot compile from the compiler"); 356 if (CompilationPolicy::must_be_compiled(method)) { 357 CompileBroker::compile_method(method, InvocationEntryBci, 358 CompilationPolicy::policy()->initial_compile_level(), 359 methodHandle(), 0, "must_be_compiled", CHECK); 360 } 361 362 // Since the call stub sets up like the interpreter we call the from_interpreted_entry 363 // so we can go compiled via a i2c. Otherwise initial entry method will always 364 // run interpreted. 365 address entry_point = method->from_interpreted_entry(); 366 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { 367 entry_point = method->interpreter_entry(); 368 } 369 370 // Figure out if the result value is an oop or not (Note: This is a different value 371 // than result_type. result_type will be T_INT of oops. (it is about size) 372 BasicType result_type = runtime_type_from(result); 373 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY); 374 375 // NOTE: if we move the computation of the result_val_address inside 376 // the call to call_stub, the optimizer produces wrong code. 377 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr()); 378 379 // Find receiver 380 Handle receiver = (!method->is_static()) ? args->receiver() : Handle(); 381 382 // When we reenter Java, we need to reenable the yellow zone which 383 // might already be disabled when we are in VM. 384 if (thread->stack_yellow_zone_disabled()) { 385 thread->reguard_stack(); 386 } 387 388 // Check that there are shadow pages available before changing thread state 389 // to Java 390 if (!os::stack_shadow_pages_available(THREAD, method)) { 391 // Throw stack overflow exception with preinitialized exception. 392 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method); 393 return; 394 } else { 395 // Touch pages checked if the OS needs them to be touched to be mapped. 396 os::bang_stack_shadow_pages(); 397 } 398 399 // do call 400 { JavaCallWrapper link(method, receiver, result, CHECK); 401 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner 402 403 StubRoutines::call_stub()( 404 (address)&link, 405 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem) 406 result_val_address, // see NOTE above (compiler problem) 407 result_type, 408 method(), 409 entry_point, 410 args->parameters(), 411 args->size_of_parameters(), 412 CHECK 413 ); 414 415 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call) 416 // Preserve oop return value across possible gc points 417 if (oop_result_flag) { 418 thread->set_vm_result((oop) result->get_jobject()); 419 } 420 } 421 } // Exit JavaCallWrapper (can block - potential return oop must be preserved) 422 423 // Check if a thread stop or suspend should be executed 424 // The following assert was not realistic. Thread.stop can set that bit at any moment. 425 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed"); 426 427 // Restore possible oop return 428 if (oop_result_flag) { 429 result->set_jobject((jobject)thread->vm_result()); 430 thread->set_vm_result(NULL); 431 } 432 } 433 434 435 //-------------------------------------------------------------------------------------- 436 // Implementation of JavaCallArguments 437 438 intptr_t* JavaCallArguments::parameters() { 439 // First convert all handles to oops 440 for(int i = 0; i < _size; i++) { 441 if (_is_oop[i]) { 442 // Handle conversion 443 _value[i] = (intptr_t)Handle::raw_resolve((oop *)_value[i]); 444 } 445 } 446 // Return argument vector 447 return _value; 448 } 449 450 451 class SignatureChekker : public SignatureIterator { 452 private: 453 bool *_is_oop; 454 int _pos; 455 BasicType _return_type; 456 intptr_t* _value; 457 Thread* _thread; 458 459 public: 460 bool _is_return; 461 462 SignatureChekker(Symbol* signature, BasicType return_type, bool is_static, bool* is_oop, intptr_t* value, Thread* thread) : SignatureIterator(signature) { 463 _is_oop = is_oop; 464 _is_return = false; 465 _return_type = return_type; 466 _pos = 0; 467 _value = value; 468 _thread = thread; 469 470 if (!is_static) { 471 check_value(true); // Receiver must be an oop 472 } 473 } 474 475 void check_value(bool type) { 476 guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments"); 477 } 478 479 void check_doing_return(bool state) { _is_return = state; } 480 481 void check_return_type(BasicType t) { 482 guarantee(_is_return && t == _return_type, "return type does not match"); 483 } 484 485 void check_int(BasicType t) { 486 if (_is_return) { 487 check_return_type(t); 488 return; 489 } 490 check_value(false); 491 } 492 493 void check_double(BasicType t) { check_long(t); } 494 495 void check_long(BasicType t) { 496 if (_is_return) { 497 check_return_type(t); 498 return; 499 } 500 501 check_value(false); 502 check_value(false); 503 } 504 505 void check_obj(BasicType t) { 506 if (_is_return) { 507 check_return_type(t); 508 return; 509 } 510 511 // verify handle and the oop pointed to by handle 512 int p = _pos; 513 bool bad = false; 514 // If argument is oop 515 if (_is_oop[p]) { 516 intptr_t v = _value[p]; 517 if (v != 0 ) { 518 size_t t = (size_t)v; 519 bad = (t < (size_t)os::vm_page_size() ) || !Handle::raw_resolve((oop *)v)->is_oop_or_null(true); 520 if (CheckJNICalls && bad) { 521 ReportJNIFatalError((JavaThread*)_thread, "Bad JNI oop argument"); 522 } 523 } 524 // for the regular debug case. 525 assert(!bad, "Bad JNI oop argument"); 526 } 527 528 check_value(true); 529 } 530 531 void do_bool() { check_int(T_BOOLEAN); } 532 void do_char() { check_int(T_CHAR); } 533 void do_float() { check_int(T_FLOAT); } 534 void do_double() { check_double(T_DOUBLE); } 535 void do_byte() { check_int(T_BYTE); } 536 void do_short() { check_int(T_SHORT); } 537 void do_int() { check_int(T_INT); } 538 void do_long() { check_long(T_LONG); } 539 void do_void() { check_return_type(T_VOID); } 540 void do_object(int begin, int end) { check_obj(T_OBJECT); } 541 void do_array(int begin, int end) { check_obj(T_OBJECT); } 542 }; 543 544 545 void JavaCallArguments::verify(methodHandle method, BasicType return_type, 546 Thread *thread) { 547 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed"); 548 549 // Treat T_OBJECT and T_ARRAY as the same 550 if (return_type == T_ARRAY) return_type = T_OBJECT; 551 552 // Check that oop information is correct 553 Symbol* signature = method->signature(); 554 555 SignatureChekker sc(signature, return_type, method->is_static(),_is_oop, _value, thread); 556 sc.iterate_parameters(); 557 sc.check_doing_return(true); 558 sc.iterate_returntype(); 559 } 560