interpreterRuntime.cpp revision 4454:cc32ccaaf47f
1/*
2 * Copyright (c) 1997, 2012, 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 "compiler/compileBroker.hpp"
29#include "compiler/disassembler.hpp"
30#include "gc_interface/collectedHeap.hpp"
31#include "interpreter/interpreter.hpp"
32#include "interpreter/interpreterRuntime.hpp"
33#include "interpreter/linkResolver.hpp"
34#include "interpreter/templateTable.hpp"
35#include "memory/oopFactory.hpp"
36#include "memory/universe.inline.hpp"
37#include "oops/constantPool.hpp"
38#include "oops/instanceKlass.hpp"
39#include "oops/methodData.hpp"
40#include "oops/objArrayKlass.hpp"
41#include "oops/oop.inline.hpp"
42#include "oops/symbol.hpp"
43#include "prims/jvmtiExport.hpp"
44#include "prims/nativeLookup.hpp"
45#include "runtime/biasedLocking.hpp"
46#include "runtime/compilationPolicy.hpp"
47#include "runtime/deoptimization.hpp"
48#include "runtime/fieldDescriptor.hpp"
49#include "runtime/handles.inline.hpp"
50#include "runtime/interfaceSupport.hpp"
51#include "runtime/java.hpp"
52#include "runtime/jfieldIDWorkaround.hpp"
53#include "runtime/osThread.hpp"
54#include "runtime/sharedRuntime.hpp"
55#include "runtime/stubRoutines.hpp"
56#include "runtime/synchronizer.hpp"
57#include "runtime/threadCritical.hpp"
58#include "utilities/events.hpp"
59#ifdef TARGET_ARCH_x86
60# include "vm_version_x86.hpp"
61#endif
62#ifdef TARGET_ARCH_sparc
63# include "vm_version_sparc.hpp"
64#endif
65#ifdef TARGET_ARCH_zero
66# include "vm_version_zero.hpp"
67#endif
68#ifdef TARGET_ARCH_arm
69# include "vm_version_arm.hpp"
70#endif
71#ifdef TARGET_ARCH_ppc
72# include "vm_version_ppc.hpp"
73#endif
74#ifdef COMPILER2
75#include "opto/runtime.hpp"
76#endif
77
78class UnlockFlagSaver {
79  private:
80    JavaThread* _thread;
81    bool _do_not_unlock;
82  public:
83    UnlockFlagSaver(JavaThread* t) {
84      _thread = t;
85      _do_not_unlock = t->do_not_unlock_if_synchronized();
86      t->set_do_not_unlock_if_synchronized(false);
87    }
88    ~UnlockFlagSaver() {
89      _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
90    }
91};
92
93//------------------------------------------------------------------------------------------------------------------------
94// State accessors
95
96void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
97  last_frame(thread).interpreter_frame_set_bcp(bcp);
98  if (ProfileInterpreter) {
99    // ProfileTraps uses MDOs independently of ProfileInterpreter.
100    // That is why we must check both ProfileInterpreter and mdo != NULL.
101    MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
102    if (mdo != NULL) {
103      NEEDS_CLEANUP;
104      last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
105    }
106  }
107}
108
109//------------------------------------------------------------------------------------------------------------------------
110// Constants
111
112
113IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
114  // access constant pool
115  ConstantPool* pool = method(thread)->constants();
116  int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
117  constantTag tag = pool->tag_at(index);
118
119  assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
120  Klass* klass = pool->klass_at(index, CHECK);
121    oop java_class = klass->java_mirror();
122    thread->set_vm_result(java_class);
123IRT_END
124
125IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
126  assert(bytecode == Bytecodes::_fast_aldc ||
127         bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
128  ResourceMark rm(thread);
129  methodHandle m (thread, method(thread));
130  Bytecode_loadconstant ldc(m, bci(thread));
131  oop result = ldc.resolve_constant(CHECK);
132#ifdef ASSERT
133  {
134    // The bytecode wrappers aren't GC-safe so construct a new one
135    Bytecode_loadconstant ldc2(m, bci(thread));
136    oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
137    assert(result == coop, "expected result for assembly code");
138  }
139#endif
140  thread->set_vm_result(result);
141}
142IRT_END
143
144
145//------------------------------------------------------------------------------------------------------------------------
146// Allocation
147
148IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
149  Klass* k_oop = pool->klass_at(index, CHECK);
150  instanceKlassHandle klass (THREAD, k_oop);
151
152  // Make sure we are not instantiating an abstract klass
153  klass->check_valid_for_instantiation(true, CHECK);
154
155  // Make sure klass is initialized
156  klass->initialize(CHECK);
157
158  // At this point the class may not be fully initialized
159  // because of recursive initialization. If it is fully
160  // initialized & has_finalized is not set, we rewrite
161  // it into its fast version (Note: no locking is needed
162  // here since this is an atomic byte write and can be
163  // done more than once).
164  //
165  // Note: In case of classes with has_finalized we don't
166  //       rewrite since that saves us an extra check in
167  //       the fast version which then would call the
168  //       slow version anyway (and do a call back into
169  //       Java).
170  //       If we have a breakpoint, then we don't rewrite
171  //       because the _breakpoint bytecode would be lost.
172  oop obj = klass->allocate_instance(CHECK);
173  thread->set_vm_result(obj);
174IRT_END
175
176
177IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
178  oop obj = oopFactory::new_typeArray(type, size, CHECK);
179  thread->set_vm_result(obj);
180IRT_END
181
182
183IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
184  // Note: no oopHandle for pool & klass needed since they are not used
185  //       anymore after new_objArray() and no GC can happen before.
186  //       (This may have to change if this code changes!)
187  Klass*    klass = pool->klass_at(index, CHECK);
188  objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
189  thread->set_vm_result(obj);
190IRT_END
191
192
193IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
194  // We may want to pass in more arguments - could make this slightly faster
195  ConstantPool* constants = method(thread)->constants();
196  int          i = get_index_u2(thread, Bytecodes::_multianewarray);
197  Klass* klass = constants->klass_at(i, CHECK);
198  int   nof_dims = number_of_dimensions(thread);
199  assert(klass->is_klass(), "not a class");
200  assert(nof_dims >= 1, "multianewarray rank must be nonzero");
201
202  // We must create an array of jints to pass to multi_allocate.
203  ResourceMark rm(thread);
204  const int small_dims = 10;
205  jint dim_array[small_dims];
206  jint *dims = &dim_array[0];
207  if (nof_dims > small_dims) {
208    dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
209  }
210  for (int index = 0; index < nof_dims; index++) {
211    // offset from first_size_address is addressed as local[index]
212    int n = Interpreter::local_offset_in_bytes(index)/jintSize;
213    dims[index] = first_size_address[n];
214  }
215  oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
216  thread->set_vm_result(obj);
217IRT_END
218
219
220IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
221  assert(obj->is_oop(), "must be a valid oop");
222  assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
223  InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
224IRT_END
225
226
227// Quicken instance-of and check-cast bytecodes
228IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
229  // Force resolving; quicken the bytecode
230  int which = get_index_u2(thread, Bytecodes::_checkcast);
231  ConstantPool* cpool = method(thread)->constants();
232  // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
233  // program we might have seen an unquick'd bytecode in the interpreter but have another
234  // thread quicken the bytecode before we get here.
235  // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
236  Klass* klass = cpool->klass_at(which, CHECK);
237  thread->set_vm_result_2(klass);
238IRT_END
239
240
241//------------------------------------------------------------------------------------------------------------------------
242// Exceptions
243
244// Assume the compiler is (or will be) interested in this event.
245// If necessary, create an MDO to hold the information, and record it.
246void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
247  assert(ProfileTraps, "call me only if profiling");
248  methodHandle trap_method(thread, method(thread));
249
250  if (trap_method.not_null()) {
251    MethodData* trap_mdo = trap_method->method_data();
252    if (trap_mdo == NULL) {
253      Method::build_interpreter_method_data(trap_method, THREAD);
254      if (HAS_PENDING_EXCEPTION) {
255        assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
256        CLEAR_PENDING_EXCEPTION;
257      }
258      trap_mdo = trap_method->method_data();
259      // and fall through...
260    }
261    if (trap_mdo != NULL) {
262      // Update per-method count of trap events.  The interpreter
263      // is updating the MDO to simulate the effect of compiler traps.
264      int trap_bci = trap_method->bci_from(bcp(thread));
265      Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
266    }
267  }
268}
269
270static Handle get_preinitialized_exception(Klass* k, TRAPS) {
271  // get klass
272  InstanceKlass* klass = InstanceKlass::cast(k);
273  assert(klass->is_initialized(),
274         "this klass should have been initialized during VM initialization");
275  // create instance - do not call constructor since we may have no
276  // (java) stack space left (should assert constructor is empty)
277  Handle exception;
278  oop exception_oop = klass->allocate_instance(CHECK_(exception));
279  exception = Handle(THREAD, exception_oop);
280  if (StackTraceInThrowable) {
281    java_lang_Throwable::fill_in_stack_trace(exception);
282  }
283  return exception;
284}
285
286// Special handling for stack overflow: since we don't have any (java) stack
287// space left we use the pre-allocated & pre-initialized StackOverflowError
288// klass to create an stack overflow error instance.  We do not call its
289// constructor for the same reason (it is empty, anyway).
290IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
291  Handle exception = get_preinitialized_exception(
292                                 SystemDictionary::StackOverflowError_klass(),
293                                 CHECK);
294  THROW_HANDLE(exception);
295IRT_END
296
297
298IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
299  // lookup exception klass
300  TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
301  if (ProfileTraps) {
302    if (s == vmSymbols::java_lang_ArithmeticException()) {
303      note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
304    } else if (s == vmSymbols::java_lang_NullPointerException()) {
305      note_trap(thread, Deoptimization::Reason_null_check, CHECK);
306    }
307  }
308  // create exception
309  Handle exception = Exceptions::new_exception(thread, s, message);
310  thread->set_vm_result(exception());
311IRT_END
312
313
314IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
315  ResourceMark rm(thread);
316  const char* klass_name = obj->klass()->external_name();
317  // lookup exception klass
318  TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
319  if (ProfileTraps) {
320    note_trap(thread, Deoptimization::Reason_class_check, CHECK);
321  }
322  // create exception, with klass name as detail message
323  Handle exception = Exceptions::new_exception(thread, s, klass_name);
324  thread->set_vm_result(exception());
325IRT_END
326
327
328IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
329  char message[jintAsStringSize];
330  // lookup exception klass
331  TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
332  if (ProfileTraps) {
333    note_trap(thread, Deoptimization::Reason_range_check, CHECK);
334  }
335  // create exception
336  sprintf(message, "%d", index);
337  THROW_MSG(s, message);
338IRT_END
339
340IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
341  JavaThread* thread, oopDesc* obj))
342
343  ResourceMark rm(thread);
344  char* message = SharedRuntime::generate_class_cast_message(
345    thread, obj->klass()->external_name());
346
347  if (ProfileTraps) {
348    note_trap(thread, Deoptimization::Reason_class_check, CHECK);
349  }
350
351  // create exception
352  THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
353IRT_END
354
355// exception_handler_for_exception(...) returns the continuation address,
356// the exception oop (via TLS) and sets the bci/bcp for the continuation.
357// The exception oop is returned to make sure it is preserved over GC (it
358// is only on the stack if the exception was thrown explicitly via athrow).
359// During this operation, the expression stack contains the values for the
360// bci where the exception happened. If the exception was propagated back
361// from a call, the expression stack contains the values for the bci at the
362// invoke w/o arguments (i.e., as if one were inside the call).
363IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
364
365  Handle             h_exception(thread, exception);
366  methodHandle       h_method   (thread, method(thread));
367  constantPoolHandle h_constants(thread, h_method->constants());
368  bool               should_repeat;
369  int                handler_bci;
370  int                current_bci = bci(thread);
371
372  // Need to do this check first since when _do_not_unlock_if_synchronized
373  // is set, we don't want to trigger any classloading which may make calls
374  // into java, or surprisingly find a matching exception handler for bci 0
375  // since at this moment the method hasn't been "officially" entered yet.
376  if (thread->do_not_unlock_if_synchronized()) {
377    ResourceMark rm;
378    assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");
379    thread->set_vm_result(exception);
380#ifdef CC_INTERP
381    return (address) -1;
382#else
383    return Interpreter::remove_activation_entry();
384#endif
385  }
386
387  do {
388    should_repeat = false;
389
390    // assertions
391#ifdef ASSERT
392    assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
393    assert(h_exception->is_oop(), "just checking");
394    // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
395    if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
396      if (ExitVMOnVerifyError) vm_exit(-1);
397      ShouldNotReachHere();
398    }
399#endif
400
401    // tracing
402    if (TraceExceptions) {
403      ttyLocker ttyl;
404      ResourceMark rm(thread);
405      tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());
406      tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
407      tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
408    }
409// Don't go paging in something which won't be used.
410//     else if (extable->length() == 0) {
411//       // disabled for now - interpreter is not using shortcut yet
412//       // (shortcut is not to call runtime if we have no exception handlers)
413//       // warning("performance bug: should not call runtime if method has no exception handlers");
414//     }
415    // for AbortVMOnException flag
416    NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
417
418    // exception handler lookup
419    KlassHandle h_klass(THREAD, h_exception->klass());
420    handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD);
421    if (HAS_PENDING_EXCEPTION) {
422      // We threw an exception while trying to find the exception handler.
423      // Transfer the new exception to the exception handle which will
424      // be set into thread local storage, and do another lookup for an
425      // exception handler for this exception, this time starting at the
426      // BCI of the exception handler which caused the exception to be
427      // thrown (bug 4307310).
428      h_exception = Handle(THREAD, PENDING_EXCEPTION);
429      CLEAR_PENDING_EXCEPTION;
430      if (handler_bci >= 0) {
431        current_bci = handler_bci;
432        should_repeat = true;
433      }
434    }
435  } while (should_repeat == true);
436
437  // notify JVMTI of an exception throw; JVMTI will detect if this is a first
438  // time throw or a stack unwinding throw and accordingly notify the debugger
439  if (JvmtiExport::can_post_on_exceptions()) {
440    JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
441  }
442
443#ifdef CC_INTERP
444  address continuation = (address)(intptr_t) handler_bci;
445#else
446  address continuation = NULL;
447#endif
448  address handler_pc = NULL;
449  if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
450    // Forward exception to callee (leaving bci/bcp untouched) because (a) no
451    // handler in this method, or (b) after a stack overflow there is not yet
452    // enough stack space available to reprotect the stack.
453#ifndef CC_INTERP
454    continuation = Interpreter::remove_activation_entry();
455#endif
456    // Count this for compilation purposes
457    h_method->interpreter_throwout_increment();
458  } else {
459    // handler in this method => change bci/bcp to handler bci/bcp and continue there
460    handler_pc = h_method->code_base() + handler_bci;
461#ifndef CC_INTERP
462    set_bcp_and_mdp(handler_pc, thread);
463    continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
464#endif
465  }
466  // notify debugger of an exception catch
467  // (this is good for exceptions caught in native methods as well)
468  if (JvmtiExport::can_post_on_exceptions()) {
469    JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
470  }
471
472  thread->set_vm_result(h_exception());
473  return continuation;
474IRT_END
475
476
477IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
478  assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
479  // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
480IRT_END
481
482
483IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
484  THROW(vmSymbols::java_lang_AbstractMethodError());
485IRT_END
486
487
488IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
489  THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
490IRT_END
491
492
493//------------------------------------------------------------------------------------------------------------------------
494// Fields
495//
496
497IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
498  // resolve field
499  FieldAccessInfo info;
500  constantPoolHandle pool(thread, method(thread)->constants());
501  bool is_put    = (bytecode == Bytecodes::_putfield  || bytecode == Bytecodes::_putstatic);
502  bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
503
504  {
505    JvmtiHideSingleStepping jhss(thread);
506    LinkResolver::resolve_field(info, pool, get_index_u2_cpcache(thread, bytecode),
507                                bytecode, false, CHECK);
508  } // end JvmtiHideSingleStepping
509
510  // check if link resolution caused cpCache to be updated
511  if (already_resolved(thread)) return;
512
513  // compute auxiliary field attributes
514  TosState state  = as_TosState(info.field_type());
515
516  // We need to delay resolving put instructions on final fields
517  // until we actually invoke one. This is required so we throw
518  // exceptions at the correct place. If we do not resolve completely
519  // in the current pass, leaving the put_code set to zero will
520  // cause the next put instruction to reresolve.
521  Bytecodes::Code put_code = (Bytecodes::Code)0;
522
523  // We also need to delay resolving getstatic instructions until the
524  // class is intitialized.  This is required so that access to the static
525  // field will call the initialization function every time until the class
526  // is completely initialized ala. in 2.17.5 in JVM Specification.
527  InstanceKlass *klass = InstanceKlass::cast(info.klass()());
528  bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
529                               !klass->is_initialized());
530  Bytecodes::Code get_code = (Bytecodes::Code)0;
531
532  if (!uninitialized_static) {
533    get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
534    if (is_put || !info.access_flags().is_final()) {
535      put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
536    }
537  }
538
539  cache_entry(thread)->set_field(
540    get_code,
541    put_code,
542    info.klass(),
543    info.field_index(),
544    info.field_offset(),
545    state,
546    info.access_flags().is_final(),
547    info.access_flags().is_volatile(),
548    pool->pool_holder()
549  );
550IRT_END
551
552
553//------------------------------------------------------------------------------------------------------------------------
554// Synchronization
555//
556// The interpreter's synchronization code is factored out so that it can
557// be shared by method invocation and synchronized blocks.
558//%note synchronization_3
559
560//%note monitor_1
561IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
562#ifdef ASSERT
563  thread->last_frame().interpreter_frame_verify_monitor(elem);
564#endif
565  if (PrintBiasedLockingStatistics) {
566    Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
567  }
568  Handle h_obj(thread, elem->obj());
569  assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
570         "must be NULL or an object");
571  if (UseBiasedLocking) {
572    // Retry fast entry if bias is revoked to avoid unnecessary inflation
573    ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
574  } else {
575    ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
576  }
577  assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
578         "must be NULL or an object");
579#ifdef ASSERT
580  thread->last_frame().interpreter_frame_verify_monitor(elem);
581#endif
582IRT_END
583
584
585//%note monitor_1
586IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
587#ifdef ASSERT
588  thread->last_frame().interpreter_frame_verify_monitor(elem);
589#endif
590  Handle h_obj(thread, elem->obj());
591  assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
592         "must be NULL or an object");
593  if (elem == NULL || h_obj()->is_unlocked()) {
594    THROW(vmSymbols::java_lang_IllegalMonitorStateException());
595  }
596  ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
597  // Free entry. This must be done here, since a pending exception might be installed on
598  // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
599  elem->set_obj(NULL);
600#ifdef ASSERT
601  thread->last_frame().interpreter_frame_verify_monitor(elem);
602#endif
603IRT_END
604
605
606IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
607  THROW(vmSymbols::java_lang_IllegalMonitorStateException());
608IRT_END
609
610
611IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
612  // Returns an illegal exception to install into the current thread. The
613  // pending_exception flag is cleared so normal exception handling does not
614  // trigger. Any current installed exception will be overwritten. This
615  // method will be called during an exception unwind.
616
617  assert(!HAS_PENDING_EXCEPTION, "no pending exception");
618  Handle exception(thread, thread->vm_result());
619  assert(exception() != NULL, "vm result should be set");
620  thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
621  if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
622    exception = get_preinitialized_exception(
623                       SystemDictionary::IllegalMonitorStateException_klass(),
624                       CATCH);
625  }
626  thread->set_vm_result(exception());
627IRT_END
628
629
630//------------------------------------------------------------------------------------------------------------------------
631// Invokes
632
633IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
634  return method->orig_bytecode_at(method->bci_from(bcp));
635IRT_END
636
637IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
638  method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
639IRT_END
640
641IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
642  JvmtiExport::post_raw_breakpoint(thread, method, bcp);
643IRT_END
644
645IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
646  // extract receiver from the outgoing argument list if necessary
647  Handle receiver(thread, NULL);
648  if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
649    ResourceMark rm(thread);
650    methodHandle m (thread, method(thread));
651    Bytecode_invoke call(m, bci(thread));
652    Symbol* signature = call.signature();
653    receiver = Handle(thread,
654                  thread->last_frame().interpreter_callee_receiver(signature));
655    assert(Universe::heap()->is_in_reserved_or_null(receiver()),
656           "sanity check");
657    assert(receiver.is_null() ||
658           !Universe::heap()->is_in_reserved(receiver->klass()),
659           "sanity check");
660  }
661
662  // resolve method
663  CallInfo info;
664  constantPoolHandle pool(thread, method(thread)->constants());
665
666  {
667    JvmtiHideSingleStepping jhss(thread);
668    LinkResolver::resolve_invoke(info, receiver, pool,
669                                 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
670    if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
671      int retry_count = 0;
672      while (info.resolved_method()->is_old()) {
673        // It is very unlikely that method is redefined more than 100 times
674        // in the middle of resolve. If it is looping here more than 100 times
675        // means then there could be a bug here.
676        guarantee((retry_count++ < 100),
677                  "Could not resolve to latest version of redefined method");
678        // method is redefined in the middle of resolve so re-try.
679        LinkResolver::resolve_invoke(info, receiver, pool,
680                                     get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
681      }
682    }
683  } // end JvmtiHideSingleStepping
684
685  // check if link resolution caused cpCache to be updated
686  if (already_resolved(thread)) return;
687
688  if (bytecode == Bytecodes::_invokeinterface) {
689
690    if (TraceItables && Verbose) {
691      ResourceMark rm(thread);
692      tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
693    }
694    if (info.resolved_method()->method_holder() ==
695                                            SystemDictionary::Object_klass()) {
696      // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
697      // (see also cpCacheOop.cpp for details)
698      methodHandle rm = info.resolved_method();
699      assert(rm->is_final() || info.has_vtable_index(),
700             "should have been set already");
701      cache_entry(thread)->set_method(bytecode, rm, info.vtable_index());
702    } else {
703      // Setup itable entry
704      int index = klassItable::compute_itable_index(info.resolved_method()());
705      cache_entry(thread)->set_interface_call(info.resolved_method(), index);
706    }
707  } else {
708    cache_entry(thread)->set_method(
709      bytecode,
710      info.resolved_method(),
711      info.vtable_index());
712  }
713}
714IRT_END
715
716
717// First time execution:  Resolve symbols, create a permanent MethodType object.
718IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) {
719  assert(EnableInvokeDynamic, "");
720  const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
721
722  // resolve method
723  CallInfo info;
724  constantPoolHandle pool(thread, method(thread)->constants());
725
726  {
727    JvmtiHideSingleStepping jhss(thread);
728    LinkResolver::resolve_invoke(info, Handle(), pool,
729                                 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
730  } // end JvmtiHideSingleStepping
731
732  cache_entry(thread)->set_method_handle(pool, info);
733}
734IRT_END
735
736
737// First time execution:  Resolve symbols, create a permanent CallSite object.
738IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
739  assert(EnableInvokeDynamic, "");
740  const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
741
742  //TO DO: consider passing BCI to Java.
743  //  int caller_bci = method(thread)->bci_from(bcp(thread));
744
745  // resolve method
746  CallInfo info;
747  constantPoolHandle pool(thread, method(thread)->constants());
748  int index = get_index_u4(thread, bytecode);
749  {
750    JvmtiHideSingleStepping jhss(thread);
751    LinkResolver::resolve_invoke(info, Handle(), pool,
752                                 index, bytecode, CHECK);
753  } // end JvmtiHideSingleStepping
754
755  ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
756  cp_cache_entry->set_dynamic_call(pool, info);
757}
758IRT_END
759
760
761//------------------------------------------------------------------------------------------------------------------------
762// Miscellaneous
763
764
765nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
766  nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
767  assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
768  if (branch_bcp != NULL && nm != NULL) {
769    // This was a successful request for an OSR nmethod.  Because
770    // frequency_counter_overflow_inner ends with a safepoint check,
771    // nm could have been unloaded so look it up again.  It's unsafe
772    // to examine nm directly since it might have been freed and used
773    // for something else.
774    frame fr = thread->last_frame();
775    Method* method =  fr.interpreter_frame_method();
776    int bci = method->bci_from(fr.interpreter_frame_bcp());
777    nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
778  }
779#ifndef PRODUCT
780  if (TraceOnStackReplacement) {
781    if (nm != NULL) {
782      tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry());
783      nm->print();
784    }
785  }
786#endif
787  return nm;
788}
789
790IRT_ENTRY(nmethod*,
791          InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
792  // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
793  // flag, in case this method triggers classloading which will call into Java.
794  UnlockFlagSaver fs(thread);
795
796  frame fr = thread->last_frame();
797  assert(fr.is_interpreted_frame(), "must come from interpreter");
798  methodHandle method(thread, fr.interpreter_frame_method());
799  const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
800  const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
801
802  assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
803  nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
804  assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
805
806  if (osr_nm != NULL) {
807    // We may need to do on-stack replacement which requires that no
808    // monitors in the activation are biased because their
809    // BasicObjectLocks will need to migrate during OSR. Force
810    // unbiasing of all monitors in the activation now (even though
811    // the OSR nmethod might be invalidated) because we don't have a
812    // safepoint opportunity later once the migration begins.
813    if (UseBiasedLocking) {
814      ResourceMark rm;
815      GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
816      for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
817           kptr < fr.interpreter_frame_monitor_begin();
818           kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
819        if( kptr->obj() != NULL ) {
820          objects_to_revoke->append(Handle(THREAD, kptr->obj()));
821        }
822      }
823      BiasedLocking::revoke(objects_to_revoke);
824    }
825  }
826  return osr_nm;
827IRT_END
828
829IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
830  assert(ProfileInterpreter, "must be profiling interpreter");
831  int bci = method->bci_from(cur_bcp);
832  MethodData* mdo = method->method_data();
833  if (mdo == NULL)  return 0;
834  return mdo->bci_to_di(bci);
835IRT_END
836
837IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
838  // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
839  // flag, in case this method triggers classloading which will call into Java.
840  UnlockFlagSaver fs(thread);
841
842  assert(ProfileInterpreter, "must be profiling interpreter");
843  frame fr = thread->last_frame();
844  assert(fr.is_interpreted_frame(), "must come from interpreter");
845  methodHandle method(thread, fr.interpreter_frame_method());
846  Method::build_interpreter_method_data(method, THREAD);
847  if (HAS_PENDING_EXCEPTION) {
848    assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
849    CLEAR_PENDING_EXCEPTION;
850    // and fall through...
851  }
852IRT_END
853
854
855#ifdef ASSERT
856IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
857  assert(ProfileInterpreter, "must be profiling interpreter");
858
859  MethodData* mdo = method->method_data();
860  assert(mdo != NULL, "must not be null");
861
862  int bci = method->bci_from(bcp);
863
864  address mdp2 = mdo->bci_to_dp(bci);
865  if (mdp != mdp2) {
866    ResourceMark rm;
867    ResetNoHandleMark rnm; // In a LEAF entry.
868    HandleMark hm;
869    tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);
870    int current_di = mdo->dp_to_di(mdp);
871    int expected_di  = mdo->dp_to_di(mdp2);
872    tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);
873    int expected_approx_bci = mdo->data_at(expected_di)->bci();
874    int approx_bci = -1;
875    if (current_di >= 0) {
876      approx_bci = mdo->data_at(current_di)->bci();
877    }
878    tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);
879    mdo->print_on(tty);
880    method->print_codes();
881  }
882  assert(mdp == mdp2, "wrong mdp");
883IRT_END
884#endif // ASSERT
885
886IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
887  assert(ProfileInterpreter, "must be profiling interpreter");
888  ResourceMark rm(thread);
889  HandleMark hm(thread);
890  frame fr = thread->last_frame();
891  assert(fr.is_interpreted_frame(), "must come from interpreter");
892  MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
893
894  // Grab a lock to ensure atomic access to setting the return bci and
895  // the displacement.  This can block and GC, invalidating all naked oops.
896  MutexLocker ml(RetData_lock);
897
898  // ProfileData is essentially a wrapper around a derived oop, so we
899  // need to take the lock before making any ProfileData structures.
900  ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
901  RetData* rdata = data->as_RetData();
902  address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
903  fr.interpreter_frame_set_mdp(new_mdp);
904IRT_END
905
906
907IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
908  // We used to need an explict preserve_arguments here for invoke bytecodes. However,
909  // stack traversal automatically takes care of preserving arguments for invoke, so
910  // this is no longer needed.
911
912  // IRT_END does an implicit safepoint check, hence we are guaranteed to block
913  // if this is called during a safepoint
914
915  if (JvmtiExport::should_post_single_step()) {
916    // We are called during regular safepoints and when the VM is
917    // single stepping. If any thread is marked for single stepping,
918    // then we may have JVMTI work to do.
919    JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
920  }
921IRT_END
922
923IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
924ConstantPoolCacheEntry *cp_entry))
925
926  // check the access_flags for the field in the klass
927
928  InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
929  int index = cp_entry->field_index();
930  if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
931
932  switch(cp_entry->flag_state()) {
933    case btos:    // fall through
934    case ctos:    // fall through
935    case stos:    // fall through
936    case itos:    // fall through
937    case ftos:    // fall through
938    case ltos:    // fall through
939    case dtos:    // fall through
940    case atos: break;
941    default: ShouldNotReachHere(); return;
942  }
943  bool is_static = (obj == NULL);
944  HandleMark hm(thread);
945
946  Handle h_obj;
947  if (!is_static) {
948    // non-static field accessors have an object, but we need a handle
949    h_obj = Handle(thread, obj);
950  }
951  instanceKlassHandle h_cp_entry_f1(thread, (Klass*)cp_entry->f1_as_klass());
952  jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static);
953  JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
954IRT_END
955
956IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
957  oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
958
959  Klass* k = (Klass*)cp_entry->f1_as_klass();
960
961  // check the access_flags for the field in the klass
962  InstanceKlass* ik = InstanceKlass::cast(k);
963  int index = cp_entry->field_index();
964  // bail out if field modifications are not watched
965  if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
966
967  char sig_type = '\0';
968
969  switch(cp_entry->flag_state()) {
970    case btos: sig_type = 'Z'; break;
971    case ctos: sig_type = 'C'; break;
972    case stos: sig_type = 'S'; break;
973    case itos: sig_type = 'I'; break;
974    case ftos: sig_type = 'F'; break;
975    case atos: sig_type = 'L'; break;
976    case ltos: sig_type = 'J'; break;
977    case dtos: sig_type = 'D'; break;
978    default:  ShouldNotReachHere(); return;
979  }
980  bool is_static = (obj == NULL);
981
982  HandleMark hm(thread);
983  instanceKlassHandle h_klass(thread, k);
984  jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static);
985  jvalue fvalue;
986#ifdef _LP64
987  fvalue = *value;
988#else
989  // Long/double values are stored unaligned and also noncontiguously with
990  // tagged stacks.  We can't just do a simple assignment even in the non-
991  // J/D cases because a C++ compiler is allowed to assume that a jvalue is
992  // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
993  // We assume that the two halves of longs/doubles are stored in interpreter
994  // stack slots in platform-endian order.
995  jlong_accessor u;
996  jint* newval = (jint*)value;
997  u.words[0] = newval[0];
998  u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
999  fvalue.j = u.long_value;
1000#endif // _LP64
1001
1002  Handle h_obj;
1003  if (!is_static) {
1004    // non-static field accessors have an object, but we need a handle
1005    h_obj = Handle(thread, obj);
1006  }
1007
1008  JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1009                                           fid, sig_type, &fvalue);
1010IRT_END
1011
1012IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1013  JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1014IRT_END
1015
1016
1017IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1018  JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1019IRT_END
1020
1021IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1022{
1023  return (Interpreter::contains(pc) ? 1 : 0);
1024}
1025IRT_END
1026
1027
1028// Implementation of SignatureHandlerLibrary
1029
1030address SignatureHandlerLibrary::set_handler_blob() {
1031  BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1032  if (handler_blob == NULL) {
1033    return NULL;
1034  }
1035  address handler = handler_blob->code_begin();
1036  _handler_blob = handler_blob;
1037  _handler = handler;
1038  return handler;
1039}
1040
1041void SignatureHandlerLibrary::initialize() {
1042  if (_fingerprints != NULL) {
1043    return;
1044  }
1045  if (set_handler_blob() == NULL) {
1046    vm_exit_out_of_memory(blob_size, "native signature handlers");
1047  }
1048
1049  BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1050                                      SignatureHandlerLibrary::buffer_size);
1051  _buffer = bb->code_begin();
1052
1053  _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1054  _handlers     = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1055}
1056
1057address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1058  address handler   = _handler;
1059  int     insts_size = buffer->pure_insts_size();
1060  if (handler + insts_size > _handler_blob->code_end()) {
1061    // get a new handler blob
1062    handler = set_handler_blob();
1063  }
1064  if (handler != NULL) {
1065    memcpy(handler, buffer->insts_begin(), insts_size);
1066    pd_set_handler(handler);
1067    ICache::invalidate_range(handler, insts_size);
1068    _handler = handler + insts_size;
1069  }
1070  return handler;
1071}
1072
1073void SignatureHandlerLibrary::add(methodHandle method) {
1074  if (method->signature_handler() == NULL) {
1075    // use slow signature handler if we can't do better
1076    int handler_index = -1;
1077    // check if we can use customized (fast) signature handler
1078    if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1079      // use customized signature handler
1080      MutexLocker mu(SignatureHandlerLibrary_lock);
1081      // make sure data structure is initialized
1082      initialize();
1083      // lookup method signature's fingerprint
1084      uint64_t fingerprint = Fingerprinter(method).fingerprint();
1085      handler_index = _fingerprints->find(fingerprint);
1086      // create handler if necessary
1087      if (handler_index < 0) {
1088        ResourceMark rm;
1089        ptrdiff_t align_offset = (address)
1090          round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1091        CodeBuffer buffer((address)(_buffer + align_offset),
1092                          SignatureHandlerLibrary::buffer_size - align_offset);
1093        InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1094        // copy into code heap
1095        address handler = set_handler(&buffer);
1096        if (handler == NULL) {
1097          // use slow signature handler
1098        } else {
1099          // debugging suppport
1100          if (PrintSignatureHandlers) {
1101            tty->cr();
1102            tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1103                          _handlers->length(),
1104                          (method->is_static() ? "static" : "receiver"),
1105                          method->name_and_sig_as_C_string(),
1106                          fingerprint,
1107                          buffer.insts_size());
1108            Disassembler::decode(handler, handler + buffer.insts_size());
1109#ifndef PRODUCT
1110            tty->print_cr(" --- associated result handler ---");
1111            address rh_begin = Interpreter::result_handler(method()->result_type());
1112            address rh_end = rh_begin;
1113            while (*(int*)rh_end != 0) {
1114              rh_end += sizeof(int);
1115            }
1116            Disassembler::decode(rh_begin, rh_end);
1117#endif
1118          }
1119          // add handler to library
1120          _fingerprints->append(fingerprint);
1121          _handlers->append(handler);
1122          // set handler index
1123          assert(_fingerprints->length() == _handlers->length(), "sanity check");
1124          handler_index = _fingerprints->length() - 1;
1125        }
1126      }
1127      // Set handler under SignatureHandlerLibrary_lock
1128    if (handler_index < 0) {
1129      // use generic signature handler
1130      method->set_signature_handler(Interpreter::slow_signature_handler());
1131    } else {
1132      // set handler
1133      method->set_signature_handler(_handlers->at(handler_index));
1134    }
1135    } else {
1136      CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1137      // use generic signature handler
1138      method->set_signature_handler(Interpreter::slow_signature_handler());
1139    }
1140  }
1141#ifdef ASSERT
1142  int handler_index = -1;
1143  int fingerprint_index = -2;
1144  {
1145    // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1146    // in any way if accessed from multiple threads. To avoid races with another
1147    // thread which may change the arrays in the above, mutex protected block, we
1148    // have to protect this read access here with the same mutex as well!
1149    MutexLocker mu(SignatureHandlerLibrary_lock);
1150    if (_handlers != NULL) {
1151    handler_index = _handlers->find(method->signature_handler());
1152    fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());
1153  }
1154  }
1155  assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1156         handler_index == fingerprint_index, "sanity check");
1157#endif // ASSERT
1158}
1159
1160
1161BufferBlob*              SignatureHandlerLibrary::_handler_blob = NULL;
1162address                  SignatureHandlerLibrary::_handler      = NULL;
1163GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1164GrowableArray<address>*  SignatureHandlerLibrary::_handlers     = NULL;
1165address                  SignatureHandlerLibrary::_buffer       = NULL;
1166
1167
1168IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1169  methodHandle m(thread, method);
1170  assert(m->is_native(), "sanity check");
1171  // lookup native function entry point if it doesn't exist
1172  bool in_base_library;
1173  if (!m->has_native_function()) {
1174    NativeLookup::lookup(m, in_base_library, CHECK);
1175  }
1176  // make sure signature handler is installed
1177  SignatureHandlerLibrary::add(m);
1178  // The interpreter entry point checks the signature handler first,
1179  // before trying to fetch the native entry point and klass mirror.
1180  // We must set the signature handler last, so that multiple processors
1181  // preparing the same method will be sure to see non-null entry & mirror.
1182IRT_END
1183
1184#if defined(IA32) || defined(AMD64) || defined(ARM)
1185IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1186  if (src_address == dest_address) {
1187    return;
1188  }
1189  ResetNoHandleMark rnm; // In a LEAF entry.
1190  HandleMark hm;
1191  ResourceMark rm;
1192  frame fr = thread->last_frame();
1193  assert(fr.is_interpreted_frame(), "");
1194  jint bci = fr.interpreter_frame_bci();
1195  methodHandle mh(thread, fr.interpreter_frame_method());
1196  Bytecode_invoke invoke(mh, bci);
1197  ArgumentSizeComputer asc(invoke.signature());
1198  int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1199  Copy::conjoint_jbytes(src_address, dest_address,
1200                       size_of_arguments * Interpreter::stackElementSize);
1201IRT_END
1202#endif
1203