1 /* 2 * Copyright (c) 1997, 2015, 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 // ============ Virtual calls ============ 177 178 void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 179 CallInfo callinfo; 180 Handle receiver = args->receiver(); 181 KlassHandle recvrKlass(THREAD, receiver.is_null() ? (Klass*)NULL : receiver->klass()); 182 LinkInfo link_info(spec_klass, name, signature, KlassHandle(), /*check_access*/false); 183 LinkResolver::resolve_virtual_call( 184 callinfo, receiver, recvrKlass, link_info, true, CHECK); 185 methodHandle method = callinfo.selected_method(); 186 assert(method.not_null(), "should have thrown exception"); 187 188 // Invoke the method 189 JavaCalls::call(result, method, args, CHECK); 190 } 191 192 193 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, TRAPS) { 194 JavaCallArguments args(receiver); // One oop argument 195 call_virtual(result, spec_klass, name, signature, &args, CHECK); 196 } 197 198 199 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { 200 JavaCallArguments args(receiver); // One oop argument 201 args.push_oop(arg1); 202 call_virtual(result, spec_klass, name, signature, &args, CHECK); 203 } 204 205 206 207 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { 208 JavaCallArguments args(receiver); // One oop argument 209 args.push_oop(arg1); 210 args.push_oop(arg2); 211 call_virtual(result, spec_klass, name, signature, &args, CHECK); 212 } 213 214 215 // ============ Special calls ============ 216 217 void JavaCalls::call_special(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 218 CallInfo callinfo; 219 LinkInfo link_info(klass, name, signature, KlassHandle(), /*check_access*/false); 220 LinkResolver::resolve_special_call(callinfo, link_info, CHECK); 221 methodHandle method = callinfo.selected_method(); 222 assert(method.not_null(), "should have thrown exception"); 223 224 // Invoke the method 225 JavaCalls::call(result, method, args, CHECK); 226 } 227 228 229 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { 230 JavaCallArguments args(receiver); // One oop argument 231 call_special(result, klass, name, signature, &args, CHECK); 232 } 233 234 235 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* 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 } 240 241 242 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* 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 } 248 249 250 // ============ Static calls ============ 251 252 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { 253 CallInfo callinfo; 254 LinkInfo link_info(klass, name, signature, KlassHandle(), /*check_access*/false); 255 LinkResolver::resolve_static_call(callinfo, link_info, true, CHECK); 256 methodHandle method = callinfo.selected_method(); 257 assert(method.not_null(), "should have thrown exception"); 258 259 // Invoke the method 260 JavaCalls::call(result, method, args, CHECK); 261 } 262 263 264 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { 265 JavaCallArguments args; // No argument 266 call_static(result, klass, name, signature, &args, CHECK); 267 } 268 269 270 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { 271 JavaCallArguments args(arg1); // One oop argument 272 call_static(result, klass, name, signature, &args, CHECK); 273 } 274 275 276 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { 277 JavaCallArguments args; // One oop argument 278 args.push_oop(arg1); 279 args.push_oop(arg2); 280 call_static(result, klass, name, signature, &args, CHECK); 281 } 282 283 284 // ------------------------------------------------- 285 // Implementation of JavaCalls (low level) 286 287 288 void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) { 289 // Check if we need to wrap a potential OS exception handler around thread 290 // This is used for e.g. Win32 structured exception handlers 291 assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls"); 292 // Need to wrap each and every time, since there might be native code down the 293 // stack that has installed its own exception handlers 294 os::os_exception_wrapper(call_helper, result, &method, args, THREAD); 295 } 296 297 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) { 298 // During dumping, Java execution environment is not fully initialized. Also, Java execution 299 // may cause undesirable side-effects in the class metadata. 300 assert(!DumpSharedSpaces, "must not execute Java bytecodes when dumping"); 301 302 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 { InstanceKlass* 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(holder->is_linked(), "rewriting must have taken place"); 332 } 333 #endif 334 335 336 assert(!thread->is_Compiler_thread(), "cannot compile from the compiler"); 337 if (CompilationPolicy::must_be_compiled(method)) { 338 CompileBroker::compile_method(method, InvocationEntryBci, 339 CompilationPolicy::policy()->initial_compile_level(), 340 methodHandle(), 0, "must_be_compiled", CHECK); 341 } 342 343 // Since the call stub sets up like the interpreter we call the from_interpreted_entry 344 // so we can go compiled via a i2c. Otherwise initial entry method will always 345 // run interpreted. 346 address entry_point = method->from_interpreted_entry(); 347 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { 348 entry_point = method->interpreter_entry(); 349 } 350 351 // Figure out if the result value is an oop or not (Note: This is a different value 352 // than result_type. result_type will be T_INT of oops. (it is about size) 353 BasicType result_type = runtime_type_from(result); 354 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY); 355 356 // NOTE: if we move the computation of the result_val_address inside 357 // the call to call_stub, the optimizer produces wrong code. 358 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr()); 359 360 // Find receiver 361 Handle receiver = (!method->is_static()) ? args->receiver() : Handle(); 362 363 // When we reenter Java, we need to reenable the yellow zone which 364 // might already be disabled when we are in VM. 365 if (thread->stack_yellow_zone_disabled()) { 366 thread->reguard_stack(); 367 } 368 369 // Check that there are shadow pages available before changing thread state 370 // to Java 371 if (!os::stack_shadow_pages_available(THREAD, method)) { 372 // Throw stack overflow exception with preinitialized exception. 373 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method); 374 return; 375 } else { 376 // Touch pages checked if the OS needs them to be touched to be mapped. 377 os::bang_stack_shadow_pages(); 378 } 379 380 // do call 381 { JavaCallWrapper link(method, receiver, result, CHECK); 382 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner 383 384 StubRoutines::call_stub()( 385 (address)&link, 386 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem) 387 result_val_address, // see NOTE above (compiler problem) 388 result_type, 389 method(), 390 entry_point, 391 args->parameters(), 392 args->size_of_parameters(), 393 CHECK 394 ); 395 396 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call) 397 // Preserve oop return value across possible gc points 398 if (oop_result_flag) { 399 thread->set_vm_result((oop) result->get_jobject()); 400 } 401 } 402 } // Exit JavaCallWrapper (can block - potential return oop must be preserved) 403 404 // Check if a thread stop or suspend should be executed 405 // The following assert was not realistic. Thread.stop can set that bit at any moment. 406 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed"); 407 408 // Restore possible oop return 409 if (oop_result_flag) { 410 result->set_jobject((jobject)thread->vm_result()); 411 thread->set_vm_result(NULL); 412 } 413 } 414 415 416 //-------------------------------------------------------------------------------------- 417 // Implementation of JavaCallArguments 418 419 intptr_t* JavaCallArguments::parameters() { 420 // First convert all handles to oops 421 for(int i = 0; i < _size; i++) { 422 if (_is_oop[i]) { 423 // Handle conversion 424 _value[i] = cast_from_oop<intptr_t>(Handle::raw_resolve((oop *)_value[i])); 425 } 426 } 427 // Return argument vector 428 return _value; 429 } 430 431 432 class SignatureChekker : public SignatureIterator { 433 private: 434 bool *_is_oop; 435 int _pos; 436 BasicType _return_type; 437 intptr_t* _value; 438 Thread* _thread; 439 440 public: 441 bool _is_return; 442 443 SignatureChekker(Symbol* signature, BasicType return_type, bool is_static, bool* is_oop, intptr_t* value, Thread* thread) : SignatureIterator(signature) { 444 _is_oop = is_oop; 445 _is_return = false; 446 _return_type = return_type; 447 _pos = 0; 448 _value = value; 449 _thread = thread; 450 451 if (!is_static) { 452 check_value(true); // Receiver must be an oop 453 } 454 } 455 456 void check_value(bool type) { 457 guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments"); 458 } 459 460 void check_doing_return(bool state) { _is_return = state; } 461 462 void check_return_type(BasicType t) { 463 guarantee(_is_return && t == _return_type, "return type does not match"); 464 } 465 466 void check_int(BasicType t) { 467 if (_is_return) { 468 check_return_type(t); 469 return; 470 } 471 check_value(false); 472 } 473 474 void check_double(BasicType t) { check_long(t); } 475 476 void check_long(BasicType t) { 477 if (_is_return) { 478 check_return_type(t); 479 return; 480 } 481 482 check_value(false); 483 check_value(false); 484 } 485 486 void check_obj(BasicType t) { 487 if (_is_return) { 488 check_return_type(t); 489 return; 490 } 491 492 // verify handle and the oop pointed to by handle 493 int p = _pos; 494 bool bad = false; 495 // If argument is oop 496 if (_is_oop[p]) { 497 intptr_t v = _value[p]; 498 if (v != 0 ) { 499 size_t t = (size_t)v; 500 bad = (t < (size_t)os::vm_page_size() ) || !Handle::raw_resolve((oop *)v)->is_oop_or_null(true); 501 if (CheckJNICalls && bad) { 502 ReportJNIFatalError((JavaThread*)_thread, "Bad JNI oop argument"); 503 } 504 } 505 // for the regular debug case. 506 assert(!bad, "Bad JNI oop argument"); 507 } 508 509 check_value(true); 510 } 511 512 void do_bool() { check_int(T_BOOLEAN); } 513 void do_char() { check_int(T_CHAR); } 514 void do_float() { check_int(T_FLOAT); } 515 void do_double() { check_double(T_DOUBLE); } 516 void do_byte() { check_int(T_BYTE); } 517 void do_short() { check_int(T_SHORT); } 518 void do_int() { check_int(T_INT); } 519 void do_long() { check_long(T_LONG); } 520 void do_void() { check_return_type(T_VOID); } 521 void do_object(int begin, int end) { check_obj(T_OBJECT); } 522 void do_array(int begin, int end) { check_obj(T_OBJECT); } 523 }; 524 525 526 void JavaCallArguments::verify(methodHandle method, BasicType return_type, 527 Thread *thread) { 528 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed"); 529 530 // Treat T_OBJECT and T_ARRAY as the same 531 if (return_type == T_ARRAY) return_type = T_OBJECT; 532 533 // Check that oop information is correct 534 Symbol* signature = method->signature(); 535 536 SignatureChekker sc(signature, return_type, method->is_static(),_is_oop, _value, thread); 537 sc.iterate_parameters(); 538 sc.check_doing_return(true); 539 sc.iterate_returntype(); 540 }