1 /*
   2  * Copyright (c) 2012, 2016, 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 #include "precompiled.hpp"
  25 #include "asm/codeBuffer.hpp"
  26 #include "classfile/javaClasses.inline.hpp"
  27 #include "code/codeCache.hpp"
  28 #include "compiler/compileBroker.hpp"
  29 #include "compiler/disassembler.hpp"
  30 #include "jvmci/jvmciRuntime.hpp"
  31 #include "jvmci/jvmciCompilerToVM.hpp"
  32 #include "jvmci/jvmciCompiler.hpp"
  33 #include "jvmci/jvmciJavaClasses.hpp"
  34 #include "jvmci/jvmciEnv.hpp"
  35 #include "logging/log.hpp"
  36 #include "memory/oopFactory.hpp"
  37 #include "oops/oop.inline.hpp"
  38 #include "oops/objArrayOop.inline.hpp"
  39 #include "prims/jvm.h"
  40 #include "runtime/biasedLocking.hpp"
  41 #include "runtime/interfaceSupport.hpp"
  42 #include "runtime/reflection.hpp"
  43 #include "runtime/sharedRuntime.hpp"
  44 #include "utilities/debug.hpp"
  45 #include "utilities/defaultStream.hpp"
  46 
  47 #if defined(_MSC_VER)
  48 #define strtoll _strtoi64
  49 #endif
  50 
  51 jobject JVMCIRuntime::_HotSpotJVMCIRuntime_instance = NULL;
  52 bool JVMCIRuntime::_HotSpotJVMCIRuntime_initialized = false;
  53 bool JVMCIRuntime::_well_known_classes_initialized = false;
  54 const char* JVMCIRuntime::_compiler = NULL;
  55 int JVMCIRuntime::_trivial_prefixes_count = 0;
  56 char** JVMCIRuntime::_trivial_prefixes = NULL;
  57 bool JVMCIRuntime::_shutdown_called = false;
  58 
  59 BasicType JVMCIRuntime::kindToBasicType(Handle kind, TRAPS) {
  60   if (kind.is_null()) {
  61     THROW_(vmSymbols::java_lang_NullPointerException(), T_ILLEGAL);
  62   }
  63   jchar ch = JavaKind::typeChar(kind);
  64   switch(ch) {
  65     case 'z': return T_BOOLEAN;
  66     case 'b': return T_BYTE;
  67     case 's': return T_SHORT;
  68     case 'c': return T_CHAR;
  69     case 'i': return T_INT;
  70     case 'f': return T_FLOAT;
  71     case 'j': return T_LONG;
  72     case 'd': return T_DOUBLE;
  73     case 'a': return T_OBJECT;
  74     case '-': return T_ILLEGAL;
  75     default:
  76       JVMCI_ERROR_(T_ILLEGAL, "unexpected Kind: %c", ch);
  77   }
  78 }
  79 
  80 // Simple helper to see if the caller of a runtime stub which
  81 // entered the VM has been deoptimized
  82 
  83 static bool caller_is_deopted() {
  84   JavaThread* thread = JavaThread::current();
  85   RegisterMap reg_map(thread, false);
  86   frame runtime_frame = thread->last_frame();
  87   frame caller_frame = runtime_frame.sender(&reg_map);
  88   assert(caller_frame.is_compiled_frame(), "must be compiled");
  89   return caller_frame.is_deoptimized_frame();
  90 }
  91 
  92 // Stress deoptimization
  93 static void deopt_caller() {
  94   if ( !caller_is_deopted()) {
  95     JavaThread* thread = JavaThread::current();
  96     RegisterMap reg_map(thread, false);
  97     frame runtime_frame = thread->last_frame();
  98     frame caller_frame = runtime_frame.sender(&reg_map);
  99     Deoptimization::deoptimize_frame(thread, caller_frame.id(), Deoptimization::Reason_constraint);
 100     assert(caller_is_deopted(), "Must be deoptimized");
 101   }
 102 }
 103 
 104 JRT_BLOCK_ENTRY(void, JVMCIRuntime::new_instance(JavaThread* thread, Klass* klass))
 105   JRT_BLOCK;
 106   assert(klass->is_klass(), "not a class");
 107   instanceKlassHandle h(thread, klass);
 108   h->check_valid_for_instantiation(true, CHECK);
 109   // make sure klass is initialized
 110   h->initialize(CHECK);
 111   // allocate instance and return via TLS
 112   oop obj = h->allocate_instance(CHECK);
 113   thread->set_vm_result(obj);
 114   JRT_BLOCK_END;
 115 
 116   if (ReduceInitialCardMarks) {
 117     new_store_pre_barrier(thread);
 118   }
 119 JRT_END
 120 
 121 JRT_BLOCK_ENTRY(void, JVMCIRuntime::new_array(JavaThread* thread, Klass* array_klass, jint length))
 122   JRT_BLOCK;
 123   // Note: no handle for klass needed since they are not used
 124   //       anymore after new_objArray() and no GC can happen before.
 125   //       (This may have to change if this code changes!)
 126   assert(array_klass->is_klass(), "not a class");
 127   oop obj;
 128   if (array_klass->is_typeArray_klass()) {
 129     BasicType elt_type = TypeArrayKlass::cast(array_klass)->element_type();
 130     obj = oopFactory::new_typeArray(elt_type, length, CHECK);
 131   } else {
 132     Klass* elem_klass = ObjArrayKlass::cast(array_klass)->element_klass();
 133     obj = oopFactory::new_objArray(elem_klass, length, CHECK);
 134   }
 135   thread->set_vm_result(obj);
 136   // This is pretty rare but this runtime patch is stressful to deoptimization
 137   // if we deoptimize here so force a deopt to stress the path.
 138   if (DeoptimizeALot) {
 139     static int deopts = 0;
 140     // Alternate between deoptimizing and raising an error (which will also cause a deopt)
 141     if (deopts++ % 2 == 0) {
 142       ResourceMark rm(THREAD);
 143       THROW(vmSymbols::java_lang_OutOfMemoryError());
 144     } else {
 145       deopt_caller();
 146     }
 147   }
 148   JRT_BLOCK_END;
 149 
 150   if (ReduceInitialCardMarks) {
 151     new_store_pre_barrier(thread);
 152   }
 153 JRT_END
 154 
 155 void JVMCIRuntime::new_store_pre_barrier(JavaThread* thread) {
 156   // After any safepoint, just before going back to compiled code,
 157   // we inform the GC that we will be doing initializing writes to
 158   // this object in the future without emitting card-marks, so
 159   // GC may take any compensating steps.
 160   // NOTE: Keep this code consistent with GraphKit::store_barrier.
 161 
 162   oop new_obj = thread->vm_result();
 163   if (new_obj == NULL)  return;
 164 
 165   assert(Universe::heap()->can_elide_tlab_store_barriers(),
 166          "compiler must check this first");
 167   // GC may decide to give back a safer copy of new_obj.
 168   new_obj = Universe::heap()->new_store_pre_barrier(thread, new_obj);
 169   thread->set_vm_result(new_obj);
 170 }
 171 
 172 JRT_ENTRY(void, JVMCIRuntime::new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims))
 173   assert(klass->is_klass(), "not a class");
 174   assert(rank >= 1, "rank must be nonzero");
 175   oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK);
 176   thread->set_vm_result(obj);
 177 JRT_END
 178 
 179 JRT_ENTRY(void, JVMCIRuntime::dynamic_new_array(JavaThread* thread, oopDesc* element_mirror, jint length))
 180   oop obj = Reflection::reflect_new_array(element_mirror, length, CHECK);
 181   thread->set_vm_result(obj);
 182 JRT_END
 183 
 184 JRT_ENTRY(void, JVMCIRuntime::dynamic_new_instance(JavaThread* thread, oopDesc* type_mirror))
 185   instanceKlassHandle klass(THREAD, java_lang_Class::as_Klass(type_mirror));
 186 
 187   if (klass == NULL) {
 188     ResourceMark rm(THREAD);
 189     THROW(vmSymbols::java_lang_InstantiationException());
 190   }
 191 
 192   // Create new instance (the receiver)
 193   klass->check_valid_for_instantiation(false, CHECK);
 194 
 195   // Make sure klass gets initialized
 196   klass->initialize(CHECK);
 197 
 198   oop obj = klass->allocate_instance(CHECK);
 199   thread->set_vm_result(obj);
 200 JRT_END
 201 
 202 extern void vm_exit(int code);
 203 
 204 // Enter this method from compiled code handler below. This is where we transition
 205 // to VM mode. This is done as a helper routine so that the method called directly
 206 // from compiled code does not have to transition to VM. This allows the entry
 207 // method to see if the nmethod that we have just looked up a handler for has
 208 // been deoptimized while we were in the vm. This simplifies the assembly code
 209 // cpu directories.
 210 //
 211 // We are entering here from exception stub (via the entry method below)
 212 // If there is a compiled exception handler in this method, we will continue there;
 213 // otherwise we will unwind the stack and continue at the caller of top frame method
 214 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to
 215 // control the area where we can allow a safepoint. After we exit the safepoint area we can
 216 // check to see if the handler we are going to return is now in a nmethod that has
 217 // been deoptimized. If that is the case we return the deopt blob
 218 // unpack_with_exception entry instead. This makes life for the exception blob easier
 219 // because making that same check and diverting is painful from assembly language.
 220 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm))
 221   // Reset method handle flag.
 222   thread->set_is_method_handle_return(false);
 223 
 224   Handle exception(thread, ex);
 225   nm = CodeCache::find_nmethod(pc);
 226   assert(nm != NULL, "this is not a compiled method");
 227   // Adjust the pc as needed/
 228   if (nm->is_deopt_pc(pc)) {
 229     RegisterMap map(thread, false);
 230     frame exception_frame = thread->last_frame().sender(&map);
 231     // if the frame isn't deopted then pc must not correspond to the caller of last_frame
 232     assert(exception_frame.is_deoptimized_frame(), "must be deopted");
 233     pc = exception_frame.pc();
 234   }
 235 #ifdef ASSERT
 236   assert(exception.not_null(), "NULL exceptions should be handled by throw_exception");
 237   assert(exception->is_oop(), "just checking");
 238   // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
 239   if (!(exception->is_a(SystemDictionary::Throwable_klass()))) {
 240     if (ExitVMOnVerifyError) vm_exit(-1);
 241     ShouldNotReachHere();
 242   }
 243 #endif
 244 
 245   // Check the stack guard pages and reenable them if necessary and there is
 246   // enough space on the stack to do so.  Use fast exceptions only if the guard
 247   // pages are enabled.
 248   bool guard_pages_enabled = thread->stack_guards_enabled();
 249   if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
 250 
 251   if (JvmtiExport::can_post_on_exceptions()) {
 252     // To ensure correct notification of exception catches and throws
 253     // we have to deoptimize here.  If we attempted to notify the
 254     // catches and throws during this exception lookup it's possible
 255     // we could deoptimize on the way out of the VM and end back in
 256     // the interpreter at the throw site.  This would result in double
 257     // notifications since the interpreter would also notify about
 258     // these same catches and throws as it unwound the frame.
 259 
 260     RegisterMap reg_map(thread);
 261     frame stub_frame = thread->last_frame();
 262     frame caller_frame = stub_frame.sender(&reg_map);
 263 
 264     // We don't really want to deoptimize the nmethod itself since we
 265     // can actually continue in the exception handler ourselves but I
 266     // don't see an easy way to have the desired effect.
 267     Deoptimization::deoptimize_frame(thread, caller_frame.id(), Deoptimization::Reason_constraint);
 268     assert(caller_is_deopted(), "Must be deoptimized");
 269 
 270     return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
 271   }
 272 
 273   // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions
 274   if (guard_pages_enabled) {
 275     address fast_continuation = nm->handler_for_exception_and_pc(exception, pc);
 276     if (fast_continuation != NULL) {
 277       // Set flag if return address is a method handle call site.
 278       thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
 279       return fast_continuation;
 280     }
 281   }
 282 
 283   // If the stack guard pages are enabled, check whether there is a handler in
 284   // the current method.  Otherwise (guard pages disabled), force an unwind and
 285   // skip the exception cache update (i.e., just leave continuation==NULL).
 286   address continuation = NULL;
 287   if (guard_pages_enabled) {
 288 
 289     // New exception handling mechanism can support inlined methods
 290     // with exception handlers since the mappings are from PC to PC
 291 
 292     // debugging support
 293     // tracing
 294     if (log_is_enabled(Info, exceptions)) {
 295       ResourceMark rm;
 296       stringStream tempst;
 297       tempst.print("compiled method <%s>\n"
 298                    " at PC" INTPTR_FORMAT " for thread " INTPTR_FORMAT,
 299                    nm->method()->print_value_string(), p2i(pc), p2i(thread));
 300       Exceptions::log_exception(exception, tempst);
 301     }
 302     // for AbortVMOnException flag
 303     NOT_PRODUCT(Exceptions::debug_check_abort(exception));
 304 
 305     // Clear out the exception oop and pc since looking up an
 306     // exception handler can cause class loading, which might throw an
 307     // exception and those fields are expected to be clear during
 308     // normal bytecode execution.
 309     thread->clear_exception_oop_and_pc();
 310 
 311     continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false);
 312     // If an exception was thrown during exception dispatch, the exception oop may have changed
 313     thread->set_exception_oop(exception());
 314     thread->set_exception_pc(pc);
 315 
 316     // the exception cache is used only by non-implicit exceptions
 317     if (continuation != NULL && !SharedRuntime::deopt_blob()->contains(continuation)) {
 318       nm->add_handler_for_exception_and_pc(exception, pc, continuation);
 319     }
 320   }
 321 
 322   // Set flag if return address is a method handle call site.
 323   thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
 324 
 325   if (log_is_enabled(Info, exceptions)) {
 326     ResourceMark rm;
 327     log_info(exceptions)("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT
 328                          " for exception thrown at PC " PTR_FORMAT,
 329                          p2i(thread), p2i(continuation), p2i(pc));
 330   }
 331 
 332   return continuation;
 333 JRT_END
 334 
 335 // Enter this method from compiled code only if there is a Java exception handler
 336 // in the method handling the exception.
 337 // We are entering here from exception stub. We don't do a normal VM transition here.
 338 // We do it in a helper. This is so we can check to see if the nmethod we have just
 339 // searched for an exception handler has been deoptimized in the meantime.
 340 address JVMCIRuntime::exception_handler_for_pc(JavaThread* thread) {
 341   oop exception = thread->exception_oop();
 342   address pc = thread->exception_pc();
 343   // Still in Java mode
 344   DEBUG_ONLY(ResetNoHandleMark rnhm);
 345   nmethod* nm = NULL;
 346   address continuation = NULL;
 347   {
 348     // Enter VM mode by calling the helper
 349     ResetNoHandleMark rnhm;
 350     continuation = exception_handler_for_pc_helper(thread, exception, pc, nm);
 351   }
 352   // Back in JAVA, use no oops DON'T safepoint
 353 
 354   // Now check to see if the compiled method we were called from is now deoptimized.
 355   // If so we must return to the deopt blob and deoptimize the nmethod
 356   if (nm != NULL && caller_is_deopted()) {
 357     continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
 358   }
 359 
 360   assert(continuation != NULL, "no handler found");
 361   return continuation;
 362 }
 363 
 364 JRT_ENTRY(void, JVMCIRuntime::create_null_exception(JavaThread* thread))
 365   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
 366   thread->set_vm_result(PENDING_EXCEPTION);
 367   CLEAR_PENDING_EXCEPTION;
 368 JRT_END
 369 
 370 JRT_ENTRY(void, JVMCIRuntime::create_out_of_bounds_exception(JavaThread* thread, jint index))
 371   char message[jintAsStringSize];
 372   sprintf(message, "%d", index);
 373   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message);
 374   thread->set_vm_result(PENDING_EXCEPTION);
 375   CLEAR_PENDING_EXCEPTION;
 376 JRT_END
 377 
 378 JRT_ENTRY_NO_ASYNC(void, JVMCIRuntime::monitorenter(JavaThread* thread, oopDesc* obj, BasicLock* lock))
 379   IF_TRACE_jvmci_3 {
 380     char type[O_BUFLEN];
 381     obj->klass()->name()->as_C_string(type, O_BUFLEN);
 382     markOop mark = obj->mark();
 383     TRACE_jvmci_3("%s: entered locking slow case with obj=" INTPTR_FORMAT ", type=%s, mark=" INTPTR_FORMAT ", lock=" INTPTR_FORMAT, thread->name(), p2i(obj), type, p2i(mark), p2i(lock));
 384     tty->flush();
 385   }
 386 #ifdef ASSERT
 387   if (PrintBiasedLockingStatistics) {
 388     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
 389   }
 390 #endif
 391   Handle h_obj(thread, obj);
 392   assert(h_obj()->is_oop(), "must be NULL or an object");
 393   if (UseBiasedLocking) {
 394     // Retry fast entry if bias is revoked to avoid unnecessary inflation
 395     ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
 396   } else {
 397     if (JVMCIUseFastLocking) {
 398       // When using fast locking, the compiled code has already tried the fast case
 399       ObjectSynchronizer::slow_enter(h_obj, lock, THREAD);
 400     } else {
 401       ObjectSynchronizer::fast_enter(h_obj, lock, false, THREAD);
 402     }
 403   }
 404   TRACE_jvmci_3("%s: exiting locking slow with obj=" INTPTR_FORMAT, thread->name(), p2i(obj));
 405 JRT_END
 406 
 407 JRT_LEAF(void, JVMCIRuntime::monitorexit(JavaThread* thread, oopDesc* obj, BasicLock* lock))
 408   assert(thread == JavaThread::current(), "threads must correspond");
 409   assert(thread->last_Java_sp(), "last_Java_sp must be set");
 410   // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown
 411   EXCEPTION_MARK;
 412 
 413 #ifdef DEBUG
 414   if (!obj->is_oop()) {
 415     ResetNoHandleMark rhm;
 416     nmethod* method = thread->last_frame().cb()->as_nmethod_or_null();
 417     if (method != NULL) {
 418       tty->print_cr("ERROR in monitorexit in method %s wrong obj " INTPTR_FORMAT, method->name(), p2i(obj));
 419     }
 420     thread->print_stack_on(tty);
 421     assert(false, "invalid lock object pointer dected");
 422   }
 423 #endif
 424 
 425   if (JVMCIUseFastLocking) {
 426     // When using fast locking, the compiled code has already tried the fast case
 427     ObjectSynchronizer::slow_exit(obj, lock, THREAD);
 428   } else {
 429     ObjectSynchronizer::fast_exit(obj, lock, THREAD);
 430   }
 431   IF_TRACE_jvmci_3 {
 432     char type[O_BUFLEN];
 433     obj->klass()->name()->as_C_string(type, O_BUFLEN);
 434     TRACE_jvmci_3("%s: exited locking slow case with obj=" INTPTR_FORMAT ", type=%s, mark=" INTPTR_FORMAT ", lock=" INTPTR_FORMAT, thread->name(), p2i(obj), type, p2i(obj->mark()), p2i(lock));
 435     tty->flush();
 436   }
 437 JRT_END
 438 
 439 JRT_LEAF(void, JVMCIRuntime::log_object(JavaThread* thread, oopDesc* obj, bool as_string, bool newline))
 440   ttyLocker ttyl;
 441 
 442   if (obj == NULL) {
 443     tty->print("NULL");
 444   } else if (obj->is_oop_or_null(true) && (!as_string || !java_lang_String::is_instance(obj))) {
 445     if (obj->is_oop_or_null(true)) {
 446       char buf[O_BUFLEN];
 447       tty->print("%s@" INTPTR_FORMAT, obj->klass()->name()->as_C_string(buf, O_BUFLEN), p2i(obj));
 448     } else {
 449       tty->print(INTPTR_FORMAT, p2i(obj));
 450     }
 451   } else {
 452     ResourceMark rm;
 453     assert(obj != NULL && java_lang_String::is_instance(obj), "must be");
 454     char *buf = java_lang_String::as_utf8_string(obj);
 455     tty->print_raw(buf);
 456   }
 457   if (newline) {
 458     tty->cr();
 459   }
 460 JRT_END
 461 
 462 JRT_LEAF(void, JVMCIRuntime::write_barrier_pre(JavaThread* thread, oopDesc* obj))
 463   thread->satb_mark_queue().enqueue(obj);
 464 JRT_END
 465 
 466 JRT_LEAF(void, JVMCIRuntime::write_barrier_post(JavaThread* thread, void* card_addr))
 467   thread->dirty_card_queue().enqueue(card_addr);
 468 JRT_END
 469 
 470 JRT_LEAF(jboolean, JVMCIRuntime::validate_object(JavaThread* thread, oopDesc* parent, oopDesc* child))
 471   bool ret = true;
 472   if(!Universe::heap()->is_in_closed_subset(parent)) {
 473     tty->print_cr("Parent Object " INTPTR_FORMAT " not in heap", p2i(parent));
 474     parent->print();
 475     ret=false;
 476   }
 477   if(!Universe::heap()->is_in_closed_subset(child)) {
 478     tty->print_cr("Child Object " INTPTR_FORMAT " not in heap", p2i(child));
 479     child->print();
 480     ret=false;
 481   }
 482   return (jint)ret;
 483 JRT_END
 484 
 485 JRT_ENTRY(void, JVMCIRuntime::vm_error(JavaThread* thread, jlong where, jlong format, jlong value))
 486   ResourceMark rm;
 487   const char *error_msg = where == 0L ? "<internal JVMCI error>" : (char*) (address) where;
 488   char *detail_msg = NULL;
 489   if (format != 0L) {
 490     const char* buf = (char*) (address) format;
 491     size_t detail_msg_length = strlen(buf) * 2;
 492     detail_msg = (char *) NEW_RESOURCE_ARRAY(u_char, detail_msg_length);
 493     jio_snprintf(detail_msg, detail_msg_length, buf, value);
 494     report_vm_error(__FILE__, __LINE__, error_msg, "%s", detail_msg);
 495   } else {
 496     report_vm_error(__FILE__, __LINE__, error_msg);
 497   }
 498 JRT_END
 499 
 500 JRT_LEAF(oopDesc*, JVMCIRuntime::load_and_clear_exception(JavaThread* thread))
 501   oop exception = thread->exception_oop();
 502   assert(exception != NULL, "npe");
 503   thread->set_exception_oop(NULL);
 504   thread->set_exception_pc(0);
 505   return exception;
 506 JRT_END
 507 
 508 PRAGMA_DIAG_PUSH
 509 PRAGMA_FORMAT_NONLITERAL_IGNORED
 510 JRT_LEAF(void, JVMCIRuntime::log_printf(JavaThread* thread, oopDesc* format, jlong v1, jlong v2, jlong v3))
 511   ResourceMark rm;
 512   assert(format != NULL && java_lang_String::is_instance(format), "must be");
 513   char *buf = java_lang_String::as_utf8_string(format);
 514   tty->print((const char*)buf, v1, v2, v3);
 515 JRT_END
 516 PRAGMA_DIAG_POP
 517 
 518 static void decipher(jlong v, bool ignoreZero) {
 519   if (v != 0 || !ignoreZero) {
 520     void* p = (void *)(address) v;
 521     CodeBlob* cb = CodeCache::find_blob(p);
 522     if (cb) {
 523       if (cb->is_nmethod()) {
 524         char buf[O_BUFLEN];
 525         tty->print("%s [" INTPTR_FORMAT "+" JLONG_FORMAT "]", cb->as_nmethod_or_null()->method()->name_and_sig_as_C_string(buf, O_BUFLEN), p2i(cb->code_begin()), (jlong)((address)v - cb->code_begin()));
 526         return;
 527       }
 528       cb->print_value_on(tty);
 529       return;
 530     }
 531     if (Universe::heap()->is_in(p)) {
 532       oop obj = oop(p);
 533       obj->print_value_on(tty);
 534       return;
 535     }
 536     tty->print(INTPTR_FORMAT " [long: " JLONG_FORMAT ", double %lf, char %c]",p2i((void *)v), (jlong)v, (jdouble)v, (char)v);
 537   }
 538 }
 539 
 540 PRAGMA_DIAG_PUSH
 541 PRAGMA_FORMAT_NONLITERAL_IGNORED
 542 JRT_LEAF(void, JVMCIRuntime::vm_message(jboolean vmError, jlong format, jlong v1, jlong v2, jlong v3))
 543   ResourceMark rm;
 544   const char *buf = (const char*) (address) format;
 545   if (vmError) {
 546     if (buf != NULL) {
 547       fatal(buf, v1, v2, v3);
 548     } else {
 549       fatal("<anonymous error>");
 550     }
 551   } else if (buf != NULL) {
 552     tty->print(buf, v1, v2, v3);
 553   } else {
 554     assert(v2 == 0, "v2 != 0");
 555     assert(v3 == 0, "v3 != 0");
 556     decipher(v1, false);
 557   }
 558 JRT_END
 559 PRAGMA_DIAG_POP
 560 
 561 JRT_LEAF(void, JVMCIRuntime::log_primitive(JavaThread* thread, jchar typeChar, jlong value, jboolean newline))
 562   union {
 563       jlong l;
 564       jdouble d;
 565       jfloat f;
 566   } uu;
 567   uu.l = value;
 568   switch (typeChar) {
 569     case 'z': tty->print(value == 0 ? "false" : "true"); break;
 570     case 'b': tty->print("%d", (jbyte) value); break;
 571     case 'c': tty->print("%c", (jchar) value); break;
 572     case 's': tty->print("%d", (jshort) value); break;
 573     case 'i': tty->print("%d", (jint) value); break;
 574     case 'f': tty->print("%f", uu.f); break;
 575     case 'j': tty->print(JLONG_FORMAT, value); break;
 576     case 'd': tty->print("%lf", uu.d); break;
 577     default: assert(false, "unknown typeChar"); break;
 578   }
 579   if (newline) {
 580     tty->cr();
 581   }
 582 JRT_END
 583 
 584 JRT_ENTRY(jint, JVMCIRuntime::identity_hash_code(JavaThread* thread, oopDesc* obj))
 585   return (jint) obj->identity_hash();
 586 JRT_END
 587 
 588 JRT_ENTRY(jboolean, JVMCIRuntime::thread_is_interrupted(JavaThread* thread, oopDesc* receiver, jboolean clear_interrupted))
 589   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
 590   // This locking requires thread_in_vm which is why this method cannot be JRT_LEAF.
 591   Handle receiverHandle(thread, receiver);
 592   MutexLockerEx ml(thread->threadObj() == (void*)receiver ? NULL : Threads_lock);
 593   JavaThread* receiverThread = java_lang_Thread::thread(receiverHandle());
 594   if (receiverThread == NULL) {
 595     // The other thread may exit during this process, which is ok so return false.
 596     return JNI_FALSE;
 597   } else {
 598     return (jint) Thread::is_interrupted(receiverThread, clear_interrupted != 0);
 599   }
 600 JRT_END
 601 
 602 JRT_ENTRY(jint, JVMCIRuntime::test_deoptimize_call_int(JavaThread* thread, int value))
 603   deopt_caller();
 604   return value;
 605 JRT_END
 606 
 607 // private static JVMCIRuntime JVMCI.initializeRuntime()
 608 JVM_ENTRY(jobject, JVM_GetJVMCIRuntime(JNIEnv *env, jclass c))
 609   if (!EnableJVMCI) {
 610     THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVMCI is not enabled")
 611   }
 612   JVMCIRuntime::initialize_HotSpotJVMCIRuntime(CHECK_NULL);
 613   jobject ret = JVMCIRuntime::get_HotSpotJVMCIRuntime_jobject(CHECK_NULL);
 614   return ret;
 615 JVM_END
 616 
 617 Handle JVMCIRuntime::callStatic(const char* className, const char* methodName, const char* signature, JavaCallArguments* args, TRAPS) {
 618   guarantee(!_HotSpotJVMCIRuntime_initialized, "cannot reinitialize HotSpotJVMCIRuntime");
 619 
 620   TempNewSymbol name = SymbolTable::new_symbol(className, CHECK_(Handle()));
 621   KlassHandle klass = SystemDictionary::resolve_or_fail(name, true, CHECK_(Handle()));
 622   TempNewSymbol runtime = SymbolTable::new_symbol(methodName, CHECK_(Handle()));
 623   TempNewSymbol sig = SymbolTable::new_symbol(signature, CHECK_(Handle()));
 624   JavaValue result(T_OBJECT);
 625   if (args == NULL) {
 626     JavaCalls::call_static(&result, klass, runtime, sig, CHECK_(Handle()));
 627   } else {
 628     JavaCalls::call_static(&result, klass, runtime, sig, args, CHECK_(Handle()));
 629   }
 630   return Handle((oop)result.get_jobject());
 631 }
 632 
 633 void JVMCIRuntime::initialize_HotSpotJVMCIRuntime(TRAPS) {
 634   if (JNIHandles::resolve(_HotSpotJVMCIRuntime_instance) == NULL) {
 635     ResourceMark rm;
 636 #ifdef ASSERT
 637     // This should only be called in the context of the JVMCI class being initialized
 638     TempNewSymbol name = SymbolTable::new_symbol("jdk/vm/ci/runtime/JVMCI", CHECK);
 639     Klass* k = SystemDictionary::resolve_or_null(name, CHECK);
 640     instanceKlassHandle klass = InstanceKlass::cast(k);
 641     assert(klass->is_being_initialized() && klass->is_reentrant_initialization(THREAD),
 642            "HotSpotJVMCIRuntime initialization should only be triggered through JVMCI initialization");
 643 #endif
 644 
 645     if (_compiler != NULL) {
 646       JavaCallArguments args;
 647       oop compiler = java_lang_String::create_oop_from_str(_compiler, CHECK);
 648       args.push_oop(compiler);
 649       callStatic("jdk/vm/ci/hotspot/HotSpotJVMCICompilerConfig",
 650                  "selectCompiler",
 651                  "(Ljava/lang/String;)Ljava/lang/Boolean;", &args, CHECK);
 652     }
 653 
 654     Handle result = callStatic("jdk/vm/ci/hotspot/HotSpotJVMCIRuntime",
 655                                "runtime",
 656                                "()Ljdk/vm/ci/hotspot/HotSpotJVMCIRuntime;", NULL, CHECK);
 657     objArrayOop trivial_prefixes = HotSpotJVMCIRuntime::trivialPrefixes(result);
 658     if (trivial_prefixes != NULL) {
 659       char** prefixes = NEW_C_HEAP_ARRAY(char*, trivial_prefixes->length(), mtCompiler);
 660       for (int i = 0; i < trivial_prefixes->length(); i++) {
 661         oop str = trivial_prefixes->obj_at(i);
 662         if (str == NULL) {
 663           THROW(vmSymbols::java_lang_NullPointerException());
 664         } else {
 665           prefixes[i] = strdup(java_lang_String::as_utf8_string(str));
 666         }
 667       }
 668       _trivial_prefixes = prefixes;
 669       _trivial_prefixes_count = trivial_prefixes->length();
 670     }
 671     _HotSpotJVMCIRuntime_initialized = true;
 672     _HotSpotJVMCIRuntime_instance = JNIHandles::make_global(result());
 673   }
 674 }
 675 
 676 void JVMCIRuntime::initialize_JVMCI(TRAPS) {
 677   if (JNIHandles::resolve(_HotSpotJVMCIRuntime_instance) == NULL) {
 678     callStatic("jdk/vm/ci/runtime/JVMCI",
 679                "getRuntime",
 680                "()Ljdk/vm/ci/runtime/JVMCIRuntime;", NULL, CHECK);
 681   }
 682   assert(_HotSpotJVMCIRuntime_initialized == true, "what?");
 683 }
 684 
 685 void JVMCIRuntime::initialize_well_known_classes(TRAPS) {
 686   if (JVMCIRuntime::_well_known_classes_initialized == false) {
 687     SystemDictionary::WKID scan = SystemDictionary::FIRST_JVMCI_WKID;
 688     SystemDictionary::initialize_wk_klasses_through(SystemDictionary::LAST_JVMCI_WKID, scan, CHECK);
 689     JVMCIJavaClasses::compute_offsets(CHECK);
 690     JVMCIRuntime::_well_known_classes_initialized = true;
 691   }
 692 }
 693 
 694 void JVMCIRuntime::metadata_do(void f(Metadata*)) {
 695   // For simplicity, the existence of HotSpotJVMCIMetaAccessContext in
 696   // the SystemDictionary well known classes should ensure the other
 697   // classes have already been loaded, so make sure their order in the
 698   // table enforces that.
 699   assert(SystemDictionary::WK_KLASS_ENUM_NAME(jdk_vm_ci_hotspot_HotSpotResolvedJavaMethodImpl) <
 700          SystemDictionary::WK_KLASS_ENUM_NAME(jdk_vm_ci_hotspot_HotSpotJVMCIMetaAccessContext), "must be loaded earlier");
 701   assert(SystemDictionary::WK_KLASS_ENUM_NAME(jdk_vm_ci_hotspot_HotSpotConstantPool) <
 702          SystemDictionary::WK_KLASS_ENUM_NAME(jdk_vm_ci_hotspot_HotSpotJVMCIMetaAccessContext), "must be loaded earlier");
 703   assert(SystemDictionary::WK_KLASS_ENUM_NAME(jdk_vm_ci_hotspot_HotSpotResolvedObjectTypeImpl) <
 704          SystemDictionary::WK_KLASS_ENUM_NAME(jdk_vm_ci_hotspot_HotSpotJVMCIMetaAccessContext), "must be loaded earlier");
 705 
 706   if (HotSpotJVMCIMetaAccessContext::klass() == NULL ||
 707       !HotSpotJVMCIMetaAccessContext::klass()->is_linked()) {
 708     // Nothing could be registered yet
 709     return;
 710   }
 711 
 712   // WeakReference<HotSpotJVMCIMetaAccessContext>[]
 713   objArrayOop allContexts = HotSpotJVMCIMetaAccessContext::allContexts();
 714   if (allContexts == NULL) {
 715     return;
 716   }
 717 
 718   // These must be loaded at this point but the linking state doesn't matter.
 719   assert(SystemDictionary::HotSpotResolvedJavaMethodImpl_klass() != NULL, "must be loaded");
 720   assert(SystemDictionary::HotSpotConstantPool_klass() != NULL, "must be loaded");
 721   assert(SystemDictionary::HotSpotResolvedObjectTypeImpl_klass() != NULL, "must be loaded");
 722 
 723   for (int i = 0; i < allContexts->length(); i++) {
 724     oop ref = allContexts->obj_at(i);
 725     if (ref != NULL) {
 726       oop referent = java_lang_ref_Reference::referent(ref);
 727       if (referent != NULL) {
 728         // Chunked Object[] with last element pointing to next chunk
 729         objArrayOop metadataRoots = HotSpotJVMCIMetaAccessContext::metadataRoots(referent);
 730         while (metadataRoots != NULL) {
 731           for (int typeIndex = 0; typeIndex < metadataRoots->length() - 1; typeIndex++) {
 732             oop reference = metadataRoots->obj_at(typeIndex);
 733             if (reference == NULL) {
 734               continue;
 735             }
 736             oop metadataRoot = java_lang_ref_Reference::referent(reference);
 737             if (metadataRoot == NULL) {
 738               continue;
 739             }
 740             if (metadataRoot->is_a(SystemDictionary::HotSpotResolvedJavaMethodImpl_klass())) {
 741               Method* method = CompilerToVM::asMethod(metadataRoot);
 742               f(method);
 743             } else if (metadataRoot->is_a(SystemDictionary::HotSpotConstantPool_klass())) {
 744               ConstantPool* constantPool = CompilerToVM::asConstantPool(metadataRoot);
 745               f(constantPool);
 746             } else if (metadataRoot->is_a(SystemDictionary::HotSpotResolvedObjectTypeImpl_klass())) {
 747               Klass* klass = CompilerToVM::asKlass(metadataRoot);
 748               f(klass);
 749             } else {
 750               metadataRoot->print();
 751               ShouldNotReachHere();
 752             }
 753           }
 754           metadataRoots = (objArrayOop)metadataRoots->obj_at(metadataRoots->length() - 1);
 755           assert(metadataRoots == NULL || metadataRoots->is_objArray(), "wrong type");
 756         }
 757       }
 758     }
 759   }
 760 }
 761 
 762 // private static void CompilerToVM.registerNatives()
 763 JVM_ENTRY(void, JVM_RegisterJVMCINatives(JNIEnv *env, jclass c2vmClass))
 764   if (!EnableJVMCI) {
 765     THROW_MSG(vmSymbols::java_lang_InternalError(), "JVMCI is not enabled");
 766   }
 767 
 768 #ifdef _LP64
 769 #ifndef TARGET_ARCH_sparc
 770   uintptr_t heap_end = (uintptr_t) Universe::heap()->reserved_region().end();
 771   uintptr_t allocation_end = heap_end + ((uintptr_t)16) * 1024 * 1024 * 1024;
 772   guarantee(heap_end < allocation_end, "heap end too close to end of address space (might lead to erroneous TLAB allocations)");
 773 #endif // TARGET_ARCH_sparc
 774 #else
 775   fatal("check TLAB allocation code for address space conflicts");
 776 #endif
 777 
 778   JVMCIRuntime::initialize_well_known_classes(CHECK);
 779 
 780   {
 781     ThreadToNativeFromVM trans(thread);
 782     env->RegisterNatives(c2vmClass, CompilerToVM::methods, CompilerToVM::methods_count());
 783   }
 784 JVM_END
 785 
 786 /**
 787  * Closure for parsing a line from a *.properties file in jre/lib/jvmci/properties.
 788  * The line must match the regular expression "[^=]+=.*". That is one or more
 789  * characters other than '=' followed by '=' followed by zero or more characters.
 790  * Everything before the '=' is the property name and everything after '=' is the value.
 791  * Lines that start with '#' are treated as comments and ignored.
 792  * No special processing of whitespace or any escape characters is performed.
 793  * The last definition of a property "wins" (i.e., it overrides all earlier
 794  * definitions of the property).
 795  */
 796 class JVMCIPropertiesFileClosure : public ParseClosure {
 797   SystemProperty** _plist;
 798 public:
 799   JVMCIPropertiesFileClosure(SystemProperty** plist) : _plist(plist) {}
 800   void do_line(char* line) {
 801     if (line[0] == '#') {
 802       // skip comment
 803       return;
 804     }
 805     size_t len = strlen(line);
 806     char* sep = strchr(line, '=');
 807     if (sep == NULL) {
 808       warn_and_abort("invalid format: could not find '=' character");
 809       return;
 810     }
 811     if (sep == line) {
 812       warn_and_abort("invalid format: name cannot be empty");
 813       return;
 814     }
 815     *sep = '\0';
 816     const char* name = line;
 817     char* value = sep + 1;
 818     Arguments::PropertyList_unique_add(_plist, name, value);
 819   }
 820 };
 821 
 822 void JVMCIRuntime::init_system_properties(SystemProperty** plist) {
 823   char jvmciDir[JVM_MAXPATHLEN];
 824   const char* fileSep = os::file_separator();
 825   jio_snprintf(jvmciDir, sizeof(jvmciDir), "%s%slib%sjvmci",
 826                Arguments::get_java_home(), fileSep, fileSep, fileSep);
 827   DIR* dir = os::opendir(jvmciDir);
 828   if (dir != NULL) {
 829     struct dirent *entry;
 830     char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(jvmciDir), mtInternal);
 831     JVMCIPropertiesFileClosure closure(plist);
 832     const unsigned suffix_len = (unsigned)strlen(".properties");
 833     while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL && !closure.is_aborted()) {
 834       const char* name = entry->d_name;
 835       if (strlen(name) > suffix_len && strcmp(name + strlen(name) - suffix_len, ".properties") == 0) {
 836         char propertiesFilePath[JVM_MAXPATHLEN];
 837         jio_snprintf(propertiesFilePath, sizeof(propertiesFilePath), "%s%s%s",jvmciDir, fileSep, name);
 838         JVMCIRuntime::parse_lines(propertiesFilePath, &closure, false);
 839       }
 840     }
 841     FREE_C_HEAP_ARRAY(char, dbuf);
 842     os::closedir(dir);
 843   }
 844 }
 845 
 846 #define CHECK_WARN_ABORT_(message) THREAD); \
 847   if (HAS_PENDING_EXCEPTION) { \
 848     warning(message); \
 849     char buf[512]; \
 850     jio_snprintf(buf, 512, "Uncaught exception at %s:%d", __FILE__, __LINE__); \
 851     JVMCIRuntime::abort_on_pending_exception(PENDING_EXCEPTION, buf); \
 852     return; \
 853   } \
 854   (void)(0
 855 
 856 void JVMCIRuntime::save_compiler(const char* compiler) {
 857   assert(compiler != NULL, "npe");
 858   assert(_compiler == NULL, "cannot reassign JVMCI compiler");
 859   _compiler = compiler;
 860 }
 861 
 862 void JVMCIRuntime::shutdown(TRAPS) {
 863   if (_HotSpotJVMCIRuntime_instance != NULL) {
 864     _shutdown_called = true;
 865     HandleMark hm(THREAD);
 866     Handle receiver = get_HotSpotJVMCIRuntime(CHECK);
 867     JavaValue result(T_VOID);
 868     JavaCallArguments args;
 869     args.push_oop(receiver);
 870     JavaCalls::call_special(&result, receiver->klass(), vmSymbols::shutdown_method_name(), vmSymbols::void_method_signature(), &args, CHECK);
 871   }
 872 }
 873 
 874 bool JVMCIRuntime::treat_as_trivial(Method* method) {
 875   if (_HotSpotJVMCIRuntime_initialized) {
 876     oop loader = method->method_holder()->class_loader();
 877     if (loader == NULL) {
 878       for (int i = 0; i < _trivial_prefixes_count; i++) {
 879         if (method->method_holder()->name()->starts_with(_trivial_prefixes[i])) {
 880           return true;
 881         }
 882       }
 883     }
 884   }
 885   return false;
 886 }
 887 
 888 void JVMCIRuntime::parse_lines(char* path, ParseClosure* closure, bool warnStatFailure) {
 889   struct stat st;
 890   if (::stat(path, &st) == 0 && (st.st_mode & S_IFREG) == S_IFREG) { // exists & is regular file
 891     int file_handle = ::open(path, os::default_file_open_flags(), 0);
 892     if (file_handle != -1) {
 893       char* buffer = NEW_C_HEAP_ARRAY(char, st.st_size + 1, mtInternal);
 894       int num_read;
 895       num_read = (int) ::read(file_handle, (char*) buffer, st.st_size);
 896       if (num_read == -1) {
 897         warning("Error reading file %s due to %s", path, strerror(errno));
 898       } else if (num_read != st.st_size) {
 899         warning("Only read %d of " SIZE_FORMAT " bytes from %s", num_read, (size_t) st.st_size, path);
 900       }
 901       ::close(file_handle);
 902       closure->set_filename(path);
 903       if (num_read == st.st_size) {
 904         buffer[num_read] = '\0';
 905 
 906         char* line = buffer;
 907         while (line - buffer < num_read && !closure->is_aborted()) {
 908           // find line end (\r, \n or \r\n)
 909           char* nextline = NULL;
 910           char* cr = strchr(line, '\r');
 911           char* lf = strchr(line, '\n');
 912           if (cr != NULL && lf != NULL) {
 913             char* min = MIN2(cr, lf);
 914             *min = '\0';
 915             if (lf == cr + 1) {
 916               nextline = lf + 1;
 917             } else {
 918               nextline = min + 1;
 919             }
 920           } else if (cr != NULL) {
 921             *cr = '\0';
 922             nextline = cr + 1;
 923           } else if (lf != NULL) {
 924             *lf = '\0';
 925             nextline = lf + 1;
 926           }
 927           // trim left
 928           while (*line == ' ' || *line == '\t') line++;
 929           char* end = line + strlen(line);
 930           // trim right
 931           while (end > line && (*(end -1) == ' ' || *(end -1) == '\t')) end--;
 932           *end = '\0';
 933           // skip comments and empty lines
 934           if (*line != '#' && strlen(line) > 0) {
 935             closure->parse_line(line);
 936           }
 937           if (nextline != NULL) {
 938             line = nextline;
 939           } else {
 940             // File without newline at the end
 941             break;
 942           }
 943         }
 944       }
 945       FREE_C_HEAP_ARRAY(char, buffer);
 946     } else {
 947       warning("Error opening file %s due to %s", path, strerror(errno));
 948     }
 949   } else if (warnStatFailure) {
 950     warning("Could not stat file %s due to %s", path, strerror(errno));
 951   }
 952 }