1 /* 2 * Copyright (c) 1997, 2014, 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/os.inline.hpp" 41 #include "runtime/signature.hpp" 42 #include "runtime/stubRoutines.hpp" 43 #include "runtime/thread.inline.hpp" 44 45 // ----------------------------------------------------- 46 // Implementation of JavaCallWrapper 47 48 JavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) { 49 JavaThread* thread = (JavaThread *)THREAD; 50 bool clear_pending_exception = true; 51 52 guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code"); 53 assert(!thread->owns_locks(), "must release all locks when leaving VM"); 54 guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler"); 55 _result = result; 56 57 // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub, 58 // since it can potentially block. 59 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread); 60 61 // After this, we are official in JavaCode. This needs to be done before we change any of the thread local 62 // info, since we cannot find oops before the new information is set up completely. 63 ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java); 64 65 // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state 66 // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions 67 // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state). 68 if (thread->has_special_runtime_exit_condition()) { 69 thread->handle_special_runtime_exit_condition(); 70 if (HAS_PENDING_EXCEPTION) { 71 clear_pending_exception = false; 72 } 73 } 74 75 76 // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing 77 // the JavaCallWrapper before the entry frame is on the stack. 78 _callee_method = callee_method(); 79 _receiver = receiver(); 80 81 #ifdef CHECK_UNHANDLED_OOPS 82 THREAD->allow_unhandled_oop(&_receiver); 83 #endif // CHECK_UNHANDLED_OOPS 84 85 _thread = (JavaThread *)thread; 86 _handles = _thread->active_handles(); // save previous handle block & Java frame linkage 87 88 // For the profiler, the last_Java_frame information in thread must always be in 89 // legal state. We have no last Java frame if last_Java_sp == NULL so 90 // the valid transition is to clear _last_Java_sp and then reset the rest of 91 // the (platform specific) state. 92 93 _anchor.copy(_thread->frame_anchor()); 94 _thread->frame_anchor()->clear(); 95 96 debug_only(_thread->inc_java_call_counter()); 97 _thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage 98 99 assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL"); 100 101 // clear any pending exception in thread (native calls start with no exception pending) 102 if(clear_pending_exception) { 103 _thread->clear_pending_exception(); 104 } 105 106 if (_anchor.last_Java_sp() == NULL) { 107 _thread->record_base_of_stack_pointer(); 108 } 109 } 110 111 112 JavaCallWrapper::~JavaCallWrapper() { 113 assert(_thread == JavaThread::current(), "must still be the same thread"); 114 115 // restore previous handle block & Java frame linkage 116 JNIHandleBlock *_old_handles = _thread->active_handles(); 117 _thread->set_active_handles(_handles); 118 119 _thread->frame_anchor()->zap(); 120 121 debug_only(_thread->dec_java_call_counter()); 122 123 if (_anchor.last_Java_sp() == NULL) { 124 _thread->set_base_of_stack_pointer(NULL); 125 } 126 127 128 // Old thread-local info. has been restored. We are not back in the VM. 129 ThreadStateTransition::transition_from_java(_thread, _thread_in_vm); 130 131 // State has been restored now make the anchor frame visible for the profiler. 132 // Do this after the transition because this allows us to put an assert 133 // the Java->vm transition which checks to see that stack is not walkable 134 // on sparc/ia64 which will catch violations of the reseting of last_Java_frame 135 // invariants (i.e. _flags always cleared on return to Java) 136 137 _thread->frame_anchor()->copy(&_anchor); 138 139 // Release handles after we are marked as being inside the VM again, since this 140 // operation might block 141 JNIHandleBlock::release_block(_old_handles, _thread); 142 } 143 144 145 void JavaCallWrapper::oops_do(OopClosure* f) { 146 f->do_oop((oop*)&_receiver); 147 handles()->oops_do(f); 148 } 149 150 151 // Helper methods 152 static BasicType runtime_type_from(JavaValue* result) { 153 switch (result->get_type()) { 154 case T_BOOLEAN: // fall through 155 case T_CHAR : // fall through 156 case T_SHORT : // fall through 157 case T_INT : // fall through 158 #ifndef _LP64 159 case T_OBJECT : // fall through 160 case T_ARRAY : // fall through 161 #endif 162 case T_BYTE : // fall through 163 case T_VOID : return T_INT; 164 case T_LONG : return T_LONG; 165 case T_FLOAT : return T_FLOAT; 166 case T_DOUBLE : return T_DOUBLE; 167 #ifdef _LP64 168 case T_ARRAY : // fall through 169 case T_OBJECT: return T_OBJECT; 170 #endif 171 } 172 ShouldNotReachHere(); 173 return T_ILLEGAL; 174 } 175 176 // ===== object constructor calls ===== 177 178 void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) { 179 assert(method->name() == vmSymbols::object_initializer_name(), "Should only be called for default constructor"); 180 assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor"); 181 182 InstanceKlass* ik = method->method_holder(); 183 if (ik->is_initialized() && ik->has_vanilla_constructor()) { 184 // safe to skip constructor call 185 } else { 186 static JavaValue result(T_VOID); 187 JavaCallArguments args(receiver); 188 call(&result, method, &args, CHECK); 189 } 190 } 191 192 // ============ Virtual calls ============ 193 194 void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 195 CallInfo callinfo; 196 Handle receiver = args->receiver(); 197 KlassHandle recvrKlass(THREAD, receiver.is_null() ? (Klass*)NULL : receiver->klass()); 198 LinkResolver::resolve_virtual_call( 199 callinfo, receiver, recvrKlass, spec_klass, name, signature, 200 KlassHandle(), false, true, CHECK); 201 methodHandle method = callinfo.selected_method(); 202 assert(method.not_null(), "should have thrown exception"); 203 204 // Invoke the method 205 JavaCalls::call(result, method, args, CHECK); 206 } 207 208 209 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, TRAPS) { 210 JavaCallArguments args(receiver); // One oop argument 211 call_virtual(result, spec_klass, name, signature, &args, CHECK); 212 } 213 214 215 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { 216 JavaCallArguments args(receiver); // One oop argument 217 args.push_oop(arg1); 218 call_virtual(result, spec_klass, name, signature, &args, CHECK); 219 } 220 221 222 223 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { 224 JavaCallArguments args(receiver); // One oop argument 225 args.push_oop(arg1); 226 args.push_oop(arg2); 227 call_virtual(result, spec_klass, name, signature, &args, CHECK); 228 } 229 230 231 // ============ Special calls ============ 232 233 void JavaCalls::call_special(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 234 CallInfo callinfo; 235 LinkResolver::resolve_special_call(callinfo, klass, name, signature, KlassHandle(), false, CHECK); 236 methodHandle method = callinfo.selected_method(); 237 assert(method.not_null(), "should have thrown exception"); 238 239 // Invoke the method 240 JavaCalls::call(result, method, args, CHECK); 241 } 242 243 244 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { 245 JavaCallArguments args(receiver); // One oop argument 246 call_special(result, klass, name, signature, &args, CHECK); 247 } 248 249 250 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { 251 JavaCallArguments args(receiver); // One oop argument 252 args.push_oop(arg1); 253 call_special(result, klass, name, signature, &args, CHECK); 254 } 255 256 257 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { 258 JavaCallArguments args(receiver); // One oop argument 259 args.push_oop(arg1); 260 args.push_oop(arg2); 261 call_special(result, klass, name, signature, &args, CHECK); 262 } 263 264 265 // ============ Static calls ============ 266 267 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 268 CallInfo callinfo; 269 LinkResolver::resolve_static_call(callinfo, klass, name, signature, KlassHandle(), false, true, CHECK); 270 methodHandle method = callinfo.selected_method(); 271 assert(method.not_null(), "should have thrown exception"); 272 273 // Invoke the method 274 JavaCalls::call(result, method, args, CHECK); 275 } 276 277 278 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { 279 JavaCallArguments args; // No argument 280 call_static(result, klass, name, signature, &args, CHECK); 281 } 282 283 284 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { 285 JavaCallArguments args(arg1); // One oop argument 286 call_static(result, klass, name, signature, &args, CHECK); 287 } 288 289 290 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { 291 JavaCallArguments args; // One oop argument 292 args.push_oop(arg1); 293 args.push_oop(arg2); 294 call_static(result, klass, name, signature, &args, CHECK); 295 } 296 297 298 // ------------------------------------------------- 299 // Implementation of JavaCalls (low level) 300 301 302 void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) { 303 // Check if we need to wrap a potential OS exception handler around thread 304 // This is used for e.g. Win32 structured exception handlers 305 assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls"); 306 // Need to wrap each and every time, since there might be native code down the 307 // stack that has installed its own exception handlers 308 os::os_exception_wrapper(call_helper, result, &method, args, THREAD); 309 } 310 311 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) { 312 if (DumpSharedSpaces) { 313 // During dumping, Java execution environment is not fully initialized. Also, Java execution 314 // may cause undesriable side-effect in the class metadata. 315 warning("must not execute Java bytecodes when dumping"); 316 exit(2); 317 } 318 319 methodHandle method = *m; 320 JavaThread* thread = (JavaThread*)THREAD; 321 assert(thread->is_Java_thread(), "must be called by a java thread"); 322 assert(method.not_null(), "must have a method to call"); 323 assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation"); 324 assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here"); 325 326 327 CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();) 328 329 // Verify the arguments 330 331 if (CheckJNICalls) { 332 args->verify(method, result->get_type(), thread); 333 } 334 else debug_only(args->verify(method, result->get_type(), thread)); 335 336 // Ignore call if method is empty 337 if (method->is_empty_method()) { 338 assert(result->get_type() == T_VOID, "an empty method must return a void value"); 339 return; 340 } 341 342 343 #ifdef ASSERT 344 { InstanceKlass* holder = method->method_holder(); 345 // A klass might not be initialized since JavaCall's might be used during the executing of 346 // the <clinit>. For example, a Thread.start might start executing on an object that is 347 // not fully initialized! (bad Java programming style) 348 assert(holder->is_linked(), "rewriting must have taken place"); 349 } 350 #endif 351 352 353 assert(!thread->is_Compiler_thread(), "cannot compile from the compiler"); 354 if (CompilationPolicy::must_be_compiled(method)) { 355 CompileBroker::compile_method(method, InvocationEntryBci, 356 CompilationPolicy::policy()->initial_compile_level(), 357 methodHandle(), 0, "must_be_compiled", CHECK); 358 } 359 360 // Since the call stub sets up like the interpreter we call the from_interpreted_entry 361 // so we can go compiled via a i2c. Otherwise initial entry method will always 362 // run interpreted. 363 address entry_point = method->from_interpreted_entry(); 364 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { 365 entry_point = method->interpreter_entry(); 366 } 367 368 // Figure out if the result value is an oop or not (Note: This is a different value 369 // than result_type. result_type will be T_INT of oops. (it is about size) 370 BasicType result_type = runtime_type_from(result); 371 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY); 372 373 // NOTE: if we move the computation of the result_val_address inside 374 // the call to call_stub, the optimizer produces wrong code. 375 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr()); 376 377 // Find receiver 378 Handle receiver = (!method->is_static()) ? args->receiver() : Handle(); 379 380 // When we reenter Java, we need to reenable the yellow zone which 381 // might already be disabled when we are in VM. 382 if (thread->stack_yellow_zone_disabled()) { 383 thread->reguard_stack(); 384 } 385 386 // Check that there are shadow pages available before changing thread state 387 // to Java 388 if (!os::stack_shadow_pages_available(THREAD, method)) { 389 // Throw stack overflow exception with preinitialized exception. 390 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method); 391 return; 392 } else { 393 // Touch pages checked if the OS needs them to be touched to be mapped. 394 os::bang_stack_shadow_pages(); 395 } 396 397 // do call 398 { JavaCallWrapper link(method, receiver, result, CHECK); 399 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner 400 401 StubRoutines::call_stub()( 402 (address)&link, 403 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem) 404 result_val_address, // see NOTE above (compiler problem) 405 result_type, 406 method(), 407 entry_point, 408 args->parameters(), 409 args->size_of_parameters(), 410 CHECK 411 ); 412 413 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call) 414 // Preserve oop return value across possible gc points 415 if (oop_result_flag) { 416 thread->set_vm_result((oop) result->get_jobject()); 417 } 418 } 419 } // Exit JavaCallWrapper (can block - potential return oop must be preserved) 420 421 // Check if a thread stop or suspend should be executed 422 // The following assert was not realistic. Thread.stop can set that bit at any moment. 423 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed"); 424 425 // Restore possible oop return 426 if (oop_result_flag) { 427 result->set_jobject((jobject)thread->vm_result()); 428 thread->set_vm_result(NULL); 429 } 430 } 431 432 433 //-------------------------------------------------------------------------------------- 434 // Implementation of JavaCallArguments 435 436 intptr_t* JavaCallArguments::parameters() { 437 // First convert all handles to oops 438 for(int i = 0; i < _size; i++) { 439 if (_is_oop[i]) { 440 // Handle conversion 441 _value[i] = cast_from_oop<intptr_t>(Handle::raw_resolve((oop *)_value[i])); 442 } 443 } 444 // Return argument vector 445 return _value; 446 } 447 448 449 class SignatureChekker : public SignatureIterator { 450 private: 451 bool *_is_oop; 452 int _pos; 453 BasicType _return_type; 454 intptr_t* _value; 455 Thread* _thread; 456 457 public: 458 bool _is_return; 459 460 SignatureChekker(Symbol* signature, BasicType return_type, bool is_static, bool* is_oop, intptr_t* value, Thread* thread) : SignatureIterator(signature) { 461 _is_oop = is_oop; 462 _is_return = false; 463 _return_type = return_type; 464 _pos = 0; 465 _value = value; 466 _thread = thread; 467 468 if (!is_static) { 469 check_value(true); // Receiver must be an oop 470 } 471 } 472 473 void check_value(bool type) { 474 guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments"); 475 } 476 477 void check_doing_return(bool state) { _is_return = state; } 478 479 void check_return_type(BasicType t) { 480 guarantee(_is_return && t == _return_type, "return type does not match"); 481 } 482 483 void check_int(BasicType t) { 484 if (_is_return) { 485 check_return_type(t); 486 return; 487 } 488 check_value(false); 489 } 490 491 void check_double(BasicType t) { check_long(t); } 492 493 void check_long(BasicType t) { 494 if (_is_return) { 495 check_return_type(t); 496 return; 497 } 498 499 check_value(false); 500 check_value(false); 501 } 502 503 void check_obj(BasicType t) { 504 if (_is_return) { 505 check_return_type(t); 506 return; 507 } 508 509 // verify handle and the oop pointed to by handle 510 int p = _pos; 511 bool bad = false; 512 // If argument is oop 513 if (_is_oop[p]) { 514 intptr_t v = _value[p]; 515 if (v != 0 ) { 516 size_t t = (size_t)v; 517 bad = (t < (size_t)os::vm_page_size() ) || !Handle::raw_resolve((oop *)v)->is_oop_or_null(true); 518 if (CheckJNICalls && bad) { 519 ReportJNIFatalError((JavaThread*)_thread, "Bad JNI oop argument"); 520 } 521 } 522 // for the regular debug case. 523 assert(!bad, "Bad JNI oop argument"); 524 } 525 526 check_value(true); 527 } 528 529 void do_bool() { check_int(T_BOOLEAN); } 530 void do_char() { check_int(T_CHAR); } 531 void do_float() { check_int(T_FLOAT); } 532 void do_double() { check_double(T_DOUBLE); } 533 void do_byte() { check_int(T_BYTE); } 534 void do_short() { check_int(T_SHORT); } 535 void do_int() { check_int(T_INT); } 536 void do_long() { check_long(T_LONG); } 537 void do_void() { check_return_type(T_VOID); } 538 void do_object(int begin, int end) { check_obj(T_OBJECT); } 539 void do_array(int begin, int end) { check_obj(T_OBJECT); } 540 }; 541 542 543 void JavaCallArguments::verify(methodHandle method, BasicType return_type, 544 Thread *thread) { 545 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed"); 546 547 // Treat T_OBJECT and T_ARRAY as the same 548 if (return_type == T_ARRAY) return_type = T_OBJECT; 549 550 // Check that oop information is correct 551 Symbol* signature = method->signature(); 552 553 SignatureChekker sc(signature, return_type, method->is_static(),_is_oop, _value, thread); 554 sc.iterate_parameters(); 555 sc.check_doing_return(true); 556 sc.iterate_returntype(); 557 }