javaCalls.cpp revision 1472:c18cbe5936b8
150186Sdwhite/* 250186Sdwhite * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 350186Sdwhite * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4188834Sluigi * 5188834Sluigi * This code is free software; you can redistribute it and/or modify it 650186Sdwhite * under the terms of the GNU General Public License version 2 only, as 750186Sdwhite * published by the Free Software Foundation. 850186Sdwhite * 950186Sdwhite * This code is distributed in the hope that it will be useful, but WITHOUT 1050186Sdwhite * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11199251Sed * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1250186Sdwhite * version 2 for more details (a copy is included in the LICENSE file that 13199251Sed * accompanied this code). 1450186Sdwhite * 15199251Sed * You should have received a copy of the GNU General Public License version 16199251Sed * 2 along with this work; if not, write to the Free Software Foundation, 17199251Sed * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18199251Sed * 19199251Sed * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20199251Sed * or visit www.oracle.com if you need additional information or have any 21199251Sed * questions. 22199251Sed * 23199251Sed */ 2450186Sdwhite 2550186Sdwhite#include "incls/_precompiled.incl" 2650186Sdwhite#include "incls/_javaCalls.cpp.incl" 2750186Sdwhite 2857048Sluigi// ----------------------------------------------------- 2957048Sluigi// Implementation of JavaCallWrapper 3057048Sluigi 3157048SluigiJavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) { 3257048Sluigi JavaThread* thread = (JavaThread *)THREAD; 3357048Sluigi bool clear_pending_exception = true; 3457048Sluigi 35266779Sluigi guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code"); 36285281Sluigi 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 // 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); 43 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); 47 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 } 57 58 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(); 63 64#ifdef CHECK_UNHANDLED_OOPS 65 THREAD->allow_unhandled_oop(&_callee_method); 66 THREAD->allow_unhandled_oop(&_receiver); 67#endif // CHECK_UNHANDLED_OOPS 68 69 _thread = (JavaThread *)thread; 70 _handles = _thread->active_handles(); // save previous handle block & Java frame linkage 71 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. 76 77 _anchor.copy(_thread->frame_anchor()); 78 _thread->frame_anchor()->clear(); 79 80 debug_only(_thread->inc_java_call_counter()); 81 _thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage 82 83 assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL"); 84 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 } 89 90 if (_anchor.last_Java_sp() == NULL) { 91 _thread->record_base_of_stack_pointer(); 92 } 93} 94 95 96JavaCallWrapper::~JavaCallWrapper() { 97 assert(_thread == JavaThread::current(), "must still be the same thread"); 98 99 // restore previous handle block & Java frame linkage 100 JNIHandleBlock *_old_handles = _thread->active_handles(); 101 _thread->set_active_handles(_handles); 102 103 _thread->frame_anchor()->zap(); 104 105 debug_only(_thread->dec_java_call_counter()); 106 107 if (_anchor.last_Java_sp() == NULL) { 108 _thread->set_base_of_stack_pointer(NULL); 109 } 110 111 112 // Old thread-local info. has been restored. We are not back in the VM. 113 ThreadStateTransition::transition_from_java(_thread, _thread_in_vm); 114 115 // 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) 120 121 _thread->frame_anchor()->copy(&_anchor); 122 123 // 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} 127 128 129void JavaCallWrapper::oops_do(OopClosure* f) { 130 f->do_oop((oop*)&_callee_method); 131 f->do_oop((oop*)&_receiver); 132 handles()->oops_do(f); 133} 134 135 136// Helper methods 137static 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} 160 161// ===== object constructor calls ===== 162 163void 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"); 166 167 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} 176 177// ============ Virtual calls ============ 178 179void 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"); 188 189 // Invoke the method 190 JavaCalls::call(result, method, args, CHECK); 191} 192 193 194void 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} 198 199 200void 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} 205 206 207 208void 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} 214 215 216// ============ Special calls ============ 217 218void 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"); 223 224 // Invoke the method 225 JavaCalls::call(result, method, args, CHECK); 226} 227 228 229void 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} 233 234 235void 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} 240 241 242void 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} 248 249 250// ============ Static calls ============ 251 252void 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"); 257 258 // Invoke the method 259 JavaCalls::call(result, method, args, CHECK); 260} 261 262 263void 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} 267 268 269void 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} 273 274 275void 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} 281 282 283// ------------------------------------------------- 284// Implementation of JavaCalls (low level) 285 286 287void 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} 295 296void 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"); 303 304 305 CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();) 306 307 // Verify the arguments 308 309 if (CheckJNICalls) { 310 args->verify(method, result->get_type(), thread); 311 } 312 else debug_only(args->verify(method, result->get_type(), thread)); 313 314 // 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 } 319 320 321#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 329 330 331 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 } 336 337 // 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 } 344 345 // 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); 349 350 // 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()); 353 354 // Find receiver 355 Handle receiver = (!method->is_static()) ? args->receiver() : Handle(); 356 357 // 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 } 362 363 // 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 } 373 374 // do call 375 { JavaCallWrapper link(method, receiver, result, CHECK); 376 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner 377 378 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 ); 389 390 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) 397 398 // 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"); 401 402 // 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} 408 409 410//-------------------------------------------------------------------------------------- 411// Implementation of JavaCallArguments 412 413intptr_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 } 421 // Return argument vector 422 return _value; 423} 424 425 426class SignatureChekker : public SignatureIterator { 427 private: 428 bool *_is_oop; 429 int _pos; 430 BasicType _return_type; 431 intptr_t* _value; 432 Thread* _thread; 433 434 public: 435 bool _is_return; 436 437 SignatureChekker(symbolHandle signature, BasicType return_type, bool is_static, bool* is_oop, intptr_t* value, Thread* thread) : SignatureIterator(signature) { 438 _is_oop = is_oop; 439 _is_return = false; 440 _return_type = return_type; 441 _pos = 0; 442 _value = value; 443 _thread = thread; 444 445 if (!is_static) { 446 check_value(true); // Receiver must be an oop 447 } 448 } 449 450 void check_value(bool type) { 451 guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments"); 452 } 453 454 void check_doing_return(bool state) { _is_return = state; } 455 456 void check_return_type(BasicType t) { 457 guarantee(_is_return && t == _return_type, "return type does not match"); 458 } 459 460 void check_int(BasicType t) { 461 if (_is_return) { 462 check_return_type(t); 463 return; 464 } 465 check_value(false); 466 } 467 468 void check_double(BasicType t) { check_long(t); } 469 470 void check_long(BasicType t) { 471 if (_is_return) { 472 check_return_type(t); 473 return; 474 } 475 476 check_value(false); 477 check_value(false); 478 } 479 480 void check_obj(BasicType t) { 481 if (_is_return) { 482 check_return_type(t); 483 return; 484 } 485 486 // verify handle and the oop pointed to by handle 487 int p = _pos; 488 bool bad = false; 489 // If argument is oop 490 if (_is_oop[p]) { 491 intptr_t v = _value[p]; 492 if (v != 0 ) { 493 size_t t = (size_t)v; 494 bad = (t < (size_t)os::vm_page_size() ) || !Handle::raw_resolve((oop *)v)->is_oop_or_null(true); 495 if (CheckJNICalls && bad) { 496 ReportJNIFatalError((JavaThread*)_thread, "Bad JNI oop argument"); 497 } 498 } 499 // for the regular debug case. 500 assert(!bad, "Bad JNI oop argument"); 501 } 502 503 check_value(true); 504 } 505 506 void do_bool() { check_int(T_BOOLEAN); } 507 void do_char() { check_int(T_CHAR); } 508 void do_float() { check_int(T_FLOAT); } 509 void do_double() { check_double(T_DOUBLE); } 510 void do_byte() { check_int(T_BYTE); } 511 void do_short() { check_int(T_SHORT); } 512 void do_int() { check_int(T_INT); } 513 void do_long() { check_long(T_LONG); } 514 void do_void() { check_return_type(T_VOID); } 515 void do_object(int begin, int end) { check_obj(T_OBJECT); } 516 void do_array(int begin, int end) { check_obj(T_OBJECT); } 517}; 518 519 520void JavaCallArguments::verify(methodHandle method, BasicType return_type, 521 Thread *thread) { 522 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed"); 523 524 // Treat T_OBJECT and T_ARRAY as the same 525 if (return_type == T_ARRAY) return_type = T_OBJECT; 526 527 // Check that oop information is correct 528 symbolHandle signature (thread, method->signature()); 529 530 SignatureChekker sc(signature, return_type, method->is_static(),_is_oop, _value, thread); 531 sc.iterate_parameters(); 532 sc.check_doing_return(true); 533 sc.iterate_returntype(); 534} 535 536