jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiImpl.cpp@4f9a42c33738 (annotated)

src/share/vm/prims/jvmtiImpl.cpp@4f9a42c33738 (annotated)

src/share/vm/prims/jvmtiImpl.cpp

Fri, 20 Sep 2013 09:30:02 -0400

author: coleenp
date: Fri, 20 Sep 2013 09:30:02 -0400
changeset 5749: 4f9a42c33738
parent 5237: f2110083203d
child 6008: 2fab5b7e6140
permissions: -rw-r--r--

8022887: Assertion hit while using class and redefining it with RedefineClasses simultaneously
Summary: Need to refetch each method from InstanceKlass after all safepoints. Removed leaky PreviousVersionInfo code.
Reviewed-by: dcubed, sspitsyn

 /*
  * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "interpreter/interpreter.hpp"
 #include "jvmtifiles/jvmtiEnv.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/instanceKlass.hpp"
 #include "prims/jvmtiAgentThread.hpp"
 #include "prims/jvmtiEventController.inline.hpp"
 #include "prims/jvmtiImpl.hpp"
 #include "prims/jvmtiRedefineClasses.hpp"
 #include "runtime/atomic.hpp"
 #include "runtime/deoptimization.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/os.hpp"
 #include "runtime/serviceThread.hpp"
 #include "runtime/signature.hpp"
 #include "runtime/thread.inline.hpp"
 #include "runtime/vframe.hpp"
 #include "runtime/vframe_hp.hpp"
 #include "runtime/vm_operations.hpp"
 #include "utilities/exceptions.hpp"
 //
 // class JvmtiAgentThread
 //
 // JavaThread used to wrap a thread started by an agent
 // using the JVMTI method RunAgentThread.
 //
 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg)
     : JavaThread(start_function_wrapper) {
     _env = env;
     _start_fn = start_fn;
     _start_arg = start_arg;
 }
 void
 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) {
     // It is expected that any Agent threads will be created as
     // Java Threads.  If this is the case, notification of the creation
     // of the thread is given in JavaThread::thread_main().
     assert(thread->is_Java_thread(), "debugger thread should be a Java Thread");
     assert(thread == JavaThread::current(), "sanity check");
     JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread;
     dthread->call_start_function();
 }
 void
 JvmtiAgentThread::call_start_function() {
     ThreadToNativeFromVM transition(this);
     _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg);
 }
 //
 // class GrowableCache - private methods
 //
 void GrowableCache::recache() {
   int len = _elements->length();
   FREE_C_HEAP_ARRAY(address, _cache, mtInternal);
   _cache = NEW_C_HEAP_ARRAY(address,len+1, mtInternal);
   for (int i=0; i<len; i++) {
     _cache[i] = _elements->at(i)->getCacheValue();
     //
     // The cache entry has gone bad. Without a valid frame pointer
     // value, the entry is useless so we simply delete it in product
     // mode. The call to remove() will rebuild the cache again
     // without the bad entry.
     //
     if (_cache[i] == NULL) {
       assert(false, "cannot recache NULL elements");
       remove(i);
       return;
     }
   }
   _cache[len] = NULL;
   _listener_fun(_this_obj,_cache);
 }
 bool GrowableCache::equals(void* v, GrowableElement *e2) {
   GrowableElement *e1 = (GrowableElement *) v;
   assert(e1 != NULL, "e1 != NULL");
   assert(e2 != NULL, "e2 != NULL");
   return e1->equals(e2);
 }
 //
 // class GrowableCache - public methods
 //
 GrowableCache::GrowableCache() {
   _this_obj       = NULL;
   _listener_fun   = NULL;
   _elements       = NULL;
   _cache          = NULL;
 }
 GrowableCache::~GrowableCache() {
   clear();
   delete _elements;
   FREE_C_HEAP_ARRAY(address, _cache, mtInternal);
 }
 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) {
   _this_obj       = this_obj;
   _listener_fun   = listener_fun;
   _elements       = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<GrowableElement*>(5,true);
   recache();
 }
 // number of elements in the collection
 int GrowableCache::length() {
   return _elements->length();
 }
 // get the value of the index element in the collection
 GrowableElement* GrowableCache::at(int index) {
   GrowableElement *e = (GrowableElement *) _elements->at(index);
   assert(e != NULL, "e != NULL");
   return e;
 }
 int GrowableCache::find(GrowableElement* e) {
   return _elements->find(e, GrowableCache::equals);
 }
 // append a copy of the element to the end of the collection
 void GrowableCache::append(GrowableElement* e) {
   GrowableElement *new_e = e->clone();
   _elements->append(new_e);
   recache();
 }
 // insert a copy of the element using lessthan()
 void GrowableCache::insert(GrowableElement* e) {
   GrowableElement *new_e = e->clone();
   _elements->append(new_e);
   int n = length()-2;
   for (int i=n; i>=0; i--) {
     GrowableElement *e1 = _elements->at(i);
     GrowableElement *e2 = _elements->at(i+1);
     if (e2->lessThan(e1)) {
       _elements->at_put(i+1, e1);
       _elements->at_put(i,   e2);
     }
   }
   recache();
 }
 // remove the element at index
 void GrowableCache::remove (int index) {
   GrowableElement *e = _elements->at(index);
   assert(e != NULL, "e != NULL");
   _elements->remove(e);
   delete e;
   recache();
 }
 // clear out all elements, release all heap space and
 // let our listener know that things have changed.
 void GrowableCache::clear() {
   int len = _elements->length();
   for (int i=0; i<len; i++) {
     delete _elements->at(i);
   }
   _elements->clear();
   recache();
 }
 void GrowableCache::oops_do(OopClosure* f) {
   int len = _elements->length();
   for (int i=0; i<len; i++) {
     GrowableElement *e = _elements->at(i);
     e->oops_do(f);
   }
 }
 void GrowableCache::gc_epilogue() {
   int len = _elements->length();
   for (int i=0; i<len; i++) {
     _cache[i] = _elements->at(i)->getCacheValue();
   }
 }
 //
 // class JvmtiBreakpoint
 //
 JvmtiBreakpoint::JvmtiBreakpoint() {
   _method = NULL;
   _bci    = 0;
   _class_loader = NULL;
 #ifdef CHECK_UNHANDLED_OOPS
   // This one is always allocated with new, but check it just in case.
   Thread *thread = Thread::current();
   if (thread->is_in_stack((address)&_method)) {
     thread->allow_unhandled_oop((oop*)&_method);
   }
 #endif // CHECK_UNHANDLED_OOPS
 }
 JvmtiBreakpoint::JvmtiBreakpoint(Method* m_method, jlocation location) {
   _method        = m_method;
   _class_loader  = _method->method_holder()->class_loader_data()->class_loader();
   assert(_method != NULL, "_method != NULL");
   _bci           = (int) location;
   assert(_bci >= 0, "_bci >= 0");
 }
 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) {
   _method   = bp._method;
   _bci      = bp._bci;
   _class_loader = bp._class_loader;
 }
 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) {
   Unimplemented();
   return false;
 }
 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) {
   return _method   == bp._method
     &&   _bci      == bp._bci;
 }
 bool JvmtiBreakpoint::is_valid() {
   // class loader can be NULL
   return _method != NULL &&
          _bci >= 0;
 }
 address JvmtiBreakpoint::getBcp() {
   return _method->bcp_from(_bci);
 }
 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) {
   ((Method*)_method->*meth_act)(_bci);
   // add/remove breakpoint to/from versions of the method that
   // are EMCP. Directly or transitively obsolete methods are
   // not saved in the PreviousVersionNodes.
   Thread *thread = Thread::current();
   instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder());
   Symbol* m_name = _method->name();
   Symbol* m_signature = _method->signature();
   // search previous versions if they exist
   PreviousVersionWalker pvw(thread, (InstanceKlass *)ikh());
   for (PreviousVersionNode * pv_node = pvw.next_previous_version();
        pv_node != NULL; pv_node = pvw.next_previous_version()) {
     GrowableArray<Method*>* methods = pv_node->prev_EMCP_methods();
     if (methods == NULL) {
       // We have run into a PreviousVersion generation where
       // all methods were made obsolete during that generation's
       // RedefineClasses() operation. At the time of that
       // operation, all EMCP methods were flushed so we don't
       // have to go back any further.
       //
       // A NULL methods array is different than an empty methods
       // array. We cannot infer any optimizations about older
       // generations from an empty methods array for the current
       // generation.
       break;
     }
     for (int i = methods->length() - 1; i >= 0; i--) {
       Method* method = methods->at(i);
       // obsolete methods that are running are not deleted from
       // previous version array, but they are skipped here.
       if (!method->is_obsolete() &&
           method->name() == m_name &&
           method->signature() == m_signature) {
         RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)",
           meth_act == &Method::set_breakpoint ? "sett" : "clear",
           method->name()->as_C_string(),
           method->signature()->as_C_string()));
         (method->*meth_act)(_bci);
         break;
       }
     }
   }
 }
 void JvmtiBreakpoint::set() {
   each_method_version_do(&Method::set_breakpoint);
 }
 void JvmtiBreakpoint::clear() {
   each_method_version_do(&Method::clear_breakpoint);
 }
 void JvmtiBreakpoint::print() {
 #ifndef PRODUCT
   const char *class_name  = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string();
   const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string();
   tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp());
 #endif
 }
 //
 // class VM_ChangeBreakpoints
 //
 // Modify the Breakpoints data structure at a safepoint
 //
 void VM_ChangeBreakpoints::doit() {
   switch (_operation) {
   case SET_BREAKPOINT:
     _breakpoints->set_at_safepoint(*_bp);
     break;
   case CLEAR_BREAKPOINT:
     _breakpoints->clear_at_safepoint(*_bp);
     break;
   default:
     assert(false, "Unknown operation");
   }
 }
 void VM_ChangeBreakpoints::oops_do(OopClosure* f) {
   // The JvmtiBreakpoints in _breakpoints will be visited via
   // JvmtiExport::oops_do.
   if (_bp != NULL) {
     _bp->oops_do(f);
   }
 }
 //
 // class JvmtiBreakpoints
 //
 // a JVMTI internal collection of JvmtiBreakpoint
 //
 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) {
   _bps.initialize(this,listener_fun);
 }
 JvmtiBreakpoints:: ~JvmtiBreakpoints() {}
 void  JvmtiBreakpoints::oops_do(OopClosure* f) {
   _bps.oops_do(f);
 }
 void JvmtiBreakpoints::gc_epilogue() {
   _bps.gc_epilogue();
 }
 void  JvmtiBreakpoints::print() {
 #ifndef PRODUCT
   ResourceMark rm;
   int n = _bps.length();
   for (int i=0; i<n; i++) {
     JvmtiBreakpoint& bp = _bps.at(i);
     tty->print("%d: ", i);
     bp.print();
     tty->print_cr("");
   }
 #endif
 }
 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
   int i = _bps.find(bp);
   if (i == -1) {
     _bps.append(bp);
     bp.set();
   }
 }
 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
   int i = _bps.find(bp);
   if (i != -1) {
     _bps.remove(i);
     bp.clear();
   }
 }
 int JvmtiBreakpoints::length() { return _bps.length(); }
 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) {
   if ( _bps.find(bp) != -1) {
      return JVMTI_ERROR_DUPLICATE;
   }
   VM_ChangeBreakpoints set_breakpoint(VM_ChangeBreakpoints::SET_BREAKPOINT, &bp);
   VMThread::execute(&set_breakpoint);
   return JVMTI_ERROR_NONE;
 }
 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) {
   if ( _bps.find(bp) == -1) {
      return JVMTI_ERROR_NOT_FOUND;
   }
   VM_ChangeBreakpoints clear_breakpoint(VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp);
   VMThread::execute(&clear_breakpoint);
   return JVMTI_ERROR_NONE;
 }
 void JvmtiBreakpoints::clearall_in_class_at_safepoint(Klass* klass) {
   bool changed = true;
   // We are going to run thru the list of bkpts
   // and delete some.  This deletion probably alters
   // the list in some implementation defined way such
   // that when we delete entry i, the next entry might
   // no longer be at i+1.  To be safe, each time we delete
   // an entry, we'll just start again from the beginning.
   // We'll stop when we make a pass thru the whole list without
   // deleting anything.
   while (changed) {
     int len = _bps.length();
     changed = false;
     for (int i = 0; i < len; i++) {
       JvmtiBreakpoint& bp = _bps.at(i);
       if (bp.method()->method_holder() == klass) {
         bp.clear();
         _bps.remove(i);
         // This changed 'i' so we have to start over.
         changed = true;
         break;
       }
     }
   }
 }
 //
 // class JvmtiCurrentBreakpoints
 //
 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints  = NULL;
 address *         JvmtiCurrentBreakpoints::_breakpoint_list    = NULL;
 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() {
   if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints);
   _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun);
   assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL");
   return (*_jvmti_breakpoints);
 }
 void  JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) {
   JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj;
   assert(this_jvmti != NULL, "this_jvmti != NULL");
   debug_only(int n = this_jvmti->length(););
   assert(cache[n] == NULL, "cache must be NULL terminated");
   set_breakpoint_list(cache);
 }
 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) {
   if (_jvmti_breakpoints != NULL) {
     _jvmti_breakpoints->oops_do(f);
   }
 }
 void JvmtiCurrentBreakpoints::gc_epilogue() {
   if (_jvmti_breakpoints != NULL) {
     _jvmti_breakpoints->gc_epilogue();
   }
 }
 ///////////////////////////////////////////////////////////////
 //
 // class VM_GetOrSetLocal
 //
 // Constructor for non-object getter
 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type)
   : _thread(thread)
   , _calling_thread(NULL)
   , _depth(depth)
   , _index(index)
   , _type(type)
   , _set(false)
   , _jvf(NULL)
   , _result(JVMTI_ERROR_NONE)
 {
 }
 // Constructor for object or non-object setter
 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value)
   : _thread(thread)
   , _calling_thread(NULL)
   , _depth(depth)
   , _index(index)
   , _type(type)
   , _value(value)
   , _set(true)
   , _jvf(NULL)
   , _result(JVMTI_ERROR_NONE)
 {
 }
 // Constructor for object getter
 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index)
   : _thread(thread)
   , _calling_thread(calling_thread)
   , _depth(depth)
   , _index(index)
   , _type(T_OBJECT)
   , _set(false)
   , _jvf(NULL)
   , _result(JVMTI_ERROR_NONE)
 {
 }
 vframe *VM_GetOrSetLocal::get_vframe() {
   if (!_thread->has_last_Java_frame()) {
     return NULL;
   }
   RegisterMap reg_map(_thread);
   vframe *vf = _thread->last_java_vframe(&reg_map);
   int d = 0;
   while ((vf != NULL) && (d < _depth)) {
     vf = vf->java_sender();
     d++;
   }
   return vf;
 }
 javaVFrame *VM_GetOrSetLocal::get_java_vframe() {
   vframe* vf = get_vframe();
   if (vf == NULL) {
     _result = JVMTI_ERROR_NO_MORE_FRAMES;
     return NULL;
   }
   javaVFrame *jvf = (javaVFrame*)vf;
   if (!vf->is_java_frame()) {
     _result = JVMTI_ERROR_OPAQUE_FRAME;
     return NULL;
   }
   return jvf;
 }
 // Check that the klass is assignable to a type with the given signature.
 // Another solution could be to use the function Klass::is_subtype_of(type).
 // But the type class can be forced to load/initialize eagerly in such a case.
 // This may cause unexpected consequences like CFLH or class-init JVMTI events.
 // It is better to avoid such a behavior.
 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) {
   assert(ty_sign != NULL, "type signature must not be NULL");
   assert(thread != NULL, "thread must not be NULL");
   assert(klass != NULL, "klass must not be NULL");
   int len = (int) strlen(ty_sign);
   if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name
     ty_sign++;
     len -= 2;
   }
   TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread);
   if (klass->name() == ty_sym) {
     return true;
   }
   // Compare primary supers
   int super_depth = klass->super_depth();
   int idx;
   for (idx = 0; idx < super_depth; idx++) {
     if (klass->primary_super_of_depth(idx)->name() == ty_sym) {
       return true;
     }
   }
   // Compare secondary supers
   Array<Klass*>* sec_supers = klass->secondary_supers();
   for (idx = 0; idx < sec_supers->length(); idx++) {
     if (((Klass*) sec_supers->at(idx))->name() == ty_sym) {
       return true;
     }
   }
   return false;
 }
 // Checks error conditions:
 //   JVMTI_ERROR_INVALID_SLOT
 //   JVMTI_ERROR_TYPE_MISMATCH
 // Returns: 'true' - everything is Ok, 'false' - error code
 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) {
   Method* method_oop = jvf->method();
   if (!method_oop->has_localvariable_table()) {
     // Just to check index boundaries
     jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0;
     if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) {
       _result = JVMTI_ERROR_INVALID_SLOT;
       return false;
     }
     return true;
   }
   jint num_entries = method_oop->localvariable_table_length();
   if (num_entries == 0) {
     _result = JVMTI_ERROR_INVALID_SLOT;
     return false;       // There are no slots
   }
   int signature_idx = -1;
   int vf_bci = jvf->bci();
   LocalVariableTableElement* table = method_oop->localvariable_table_start();
   for (int i = 0; i < num_entries; i++) {
     int start_bci = table[i].start_bci;
     int end_bci = start_bci + table[i].length;
     // Here we assume that locations of LVT entries
     // with the same slot number cannot be overlapped
     if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) {
       signature_idx = (int) table[i].descriptor_cp_index;
       break;
     }
   }
   if (signature_idx == -1) {
     _result = JVMTI_ERROR_INVALID_SLOT;
     return false;       // Incorrect slot index
   }
   Symbol*   sign_sym  = method_oop->constants()->symbol_at(signature_idx);
   const char* signature = (const char *) sign_sym->as_utf8();
   BasicType slot_type = char2type(signature[0]);
   switch (slot_type) {
   case T_BYTE:
   case T_SHORT:
   case T_CHAR:
   case T_BOOLEAN:
     slot_type = T_INT;
     break;
   case T_ARRAY:
     slot_type = T_OBJECT;
     break;
   };
   if (_type != slot_type) {
     _result = JVMTI_ERROR_TYPE_MISMATCH;
     return false;
   }
   jobject jobj = _value.l;
   if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed
     // Check that the jobject class matches the return type signature.
     JavaThread* cur_thread = JavaThread::current();
     HandleMark hm(cur_thread);
     Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj));
     NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false));
     KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass());
     NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false));
     if (!is_assignable(signature, ob_kh(), cur_thread)) {
       _result = JVMTI_ERROR_TYPE_MISMATCH;
       return false;
     }
   }
   return true;
 }
 static bool can_be_deoptimized(vframe* vf) {
   return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
 }
 bool VM_GetOrSetLocal::doit_prologue() {
   _jvf = get_java_vframe();
   NULL_CHECK(_jvf, false);
   if (_jvf->method()->is_native()) {
     if (getting_receiver() && !_jvf->method()->is_static()) {
       return true;
     } else {
       _result = JVMTI_ERROR_OPAQUE_FRAME;
       return false;
     }
   }
   if (!check_slot_type(_jvf)) {
     return false;
   }
   return true;
 }
 void VM_GetOrSetLocal::doit() {
   if (_set) {
     // Force deoptimization of frame if compiled because it's
     // possible the compiler emitted some locals as constant values,
     // meaning they are not mutable.
     if (can_be_deoptimized(_jvf)) {
       // Schedule deoptimization so that eventually the local
       // update will be written to an interpreter frame.
       Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id());
       // Now store a new value for the local which will be applied
       // once deoptimization occurs. Note however that while this
       // write is deferred until deoptimization actually happens
       // can vframe created after this point will have its locals
       // reflecting this update so as far as anyone can see the
       // write has already taken place.
       // If we are updating an oop then get the oop from the handle
       // since the handle will be long gone by the time the deopt
       // happens. The oop stored in the deferred local will be
       // gc'd on its own.
       if (_type == T_OBJECT) {
         _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l));
       }
       // Re-read the vframe so we can see that it is deoptimized
       // [ Only need because of assert in update_local() ]
       _jvf = get_java_vframe();
       ((compiledVFrame*)_jvf)->update_local(_type, _index, _value);
       return;
     }
     StackValueCollection *locals = _jvf->locals();
     HandleMark hm;
     switch (_type) {
       case T_INT:    locals->set_int_at   (_index, _value.i); break;
       case T_LONG:   locals->set_long_at  (_index, _value.j); break;
       case T_FLOAT:  locals->set_float_at (_index, _value.f); break;
       case T_DOUBLE: locals->set_double_at(_index, _value.d); break;
       case T_OBJECT: {
         Handle ob_h(JNIHandles::resolve_external_guard(_value.l));
         locals->set_obj_at (_index, ob_h);
         break;
       }
       default: ShouldNotReachHere();
     }
     _jvf->set_locals(locals);
   } else {
     if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) {
       assert(getting_receiver(), "Can only get here when getting receiver");
       oop receiver = _jvf->fr().get_native_receiver();
       _value.l = JNIHandles::make_local(_calling_thread, receiver);
     } else {
       StackValueCollection *locals = _jvf->locals();
       if (locals->at(_index)->type() == T_CONFLICT) {
         memset(&_value, 0, sizeof(_value));
         _value.l = NULL;
         return;
       }
       switch (_type) {
         case T_INT:    _value.i = locals->int_at   (_index);   break;
         case T_LONG:   _value.j = locals->long_at  (_index);   break;
         case T_FLOAT:  _value.f = locals->float_at (_index);   break;
         case T_DOUBLE: _value.d = locals->double_at(_index);   break;
         case T_OBJECT: {
           // Wrap the oop to be returned in a local JNI handle since
           // oops_do() no longer applies after doit() is finished.
           oop obj = locals->obj_at(_index)();
           _value.l = JNIHandles::make_local(_calling_thread, obj);
           break;
         }
         default: ShouldNotReachHere();
       }
     }
   }
 }
 bool VM_GetOrSetLocal::allow_nested_vm_operations() const {
   return true; // May need to deoptimize
 }
 VM_GetReceiver::VM_GetReceiver(
     JavaThread* thread, JavaThread* caller_thread, jint depth)
     : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {}
 /////////////////////////////////////////////////////////////////////////////////////////
 //
 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp
 //
 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) {
   // external suspend should have caught suspending a thread twice
   // Immediate suspension required for JPDA back-end so JVMTI agent threads do
   // not deadlock due to later suspension on transitions while holding
   // raw monitors.  Passing true causes the immediate suspension.
   // java_suspend() will catch threads in the process of exiting
   // and will ignore them.
   java_thread->java_suspend();
   // It would be nice to have the following assertion in all the time,
   // but it is possible for a racing resume request to have resumed
   // this thread right after we suspended it. Temporarily enable this
   // assertion if you are chasing a different kind of bug.
   //
   // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL ||
   //   java_thread->is_being_ext_suspended(), "thread is not suspended");
   if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) {
     // check again because we can get delayed in java_suspend():
     // the thread is in process of exiting.
     return false;
   }
   return true;
 }
 bool JvmtiSuspendControl::resume(JavaThread *java_thread) {
   // external suspend should have caught resuming a thread twice
   assert(java_thread->is_being_ext_suspended(), "thread should be suspended");
   // resume thread
   {
     // must always grab Threads_lock, see JVM_SuspendThread
     MutexLocker ml(Threads_lock);
     java_thread->java_resume();
   }
   return true;
 }
 void JvmtiSuspendControl::print() {
 #ifndef PRODUCT
   MutexLocker mu(Threads_lock);
   ResourceMark rm;
   tty->print("Suspended Threads: [");
   for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
 #ifdef JVMTI_TRACE
     const char *name   = JvmtiTrace::safe_get_thread_name(thread);
 #else
     const char *name   = "";
 #endif /*JVMTI_TRACE */
     tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_');
     if (!thread->has_last_Java_frame()) {
       tty->print("no stack");
     }
     tty->print(") ");
   }
   tty->print_cr("]");
 #endif
 }
 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event(
     nmethod* nm) {
   JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD);
   event._event_data.compiled_method_load = nm;
   // Keep the nmethod alive until the ServiceThread can process
   // this deferred event.
   nmethodLocker::lock_nmethod(nm);
   return event;
 }
 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event(
     nmethod* nm, jmethodID id, const void* code) {
   JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD);
   event._event_data.compiled_method_unload.nm = nm;
   event._event_data.compiled_method_unload.method_id = id;
   event._event_data.compiled_method_unload.code_begin = code;
   // Keep the nmethod alive until the ServiceThread can process
   // this deferred event. This will keep the memory for the
   // generated code from being reused too early. We pass
   // zombie_ok == true here so that our nmethod that was just
   // made into a zombie can be locked.
   nmethodLocker::lock_nmethod(nm, true /* zombie_ok */);
   return event;
 }
 JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event(
       const char* name, const void* code_begin, const void* code_end) {
   JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED);
   // Need to make a copy of the name since we don't know how long
   // the event poster will keep it around after we enqueue the
   // deferred event and return. strdup() failure is handled in
   // the post() routine below.
   event._event_data.dynamic_code_generated.name = os::strdup(name);
   event._event_data.dynamic_code_generated.code_begin = code_begin;
   event._event_data.dynamic_code_generated.code_end = code_end;
   return event;
 }
 void JvmtiDeferredEvent::post() {
   assert(ServiceThread::is_service_thread(Thread::current()),
          "Service thread must post enqueued events");
   switch(_type) {
     case TYPE_COMPILED_METHOD_LOAD: {
       nmethod* nm = _event_data.compiled_method_load;
       JvmtiExport::post_compiled_method_load(nm);
       // done with the deferred event so unlock the nmethod
       nmethodLocker::unlock_nmethod(nm);
       break;
     }
     case TYPE_COMPILED_METHOD_UNLOAD: {
       nmethod* nm = _event_data.compiled_method_unload.nm;
       JvmtiExport::post_compiled_method_unload(
         _event_data.compiled_method_unload.method_id,
         _event_data.compiled_method_unload.code_begin);
       // done with the deferred event so unlock the nmethod
       nmethodLocker::unlock_nmethod(nm);
       break;
     }
     case TYPE_DYNAMIC_CODE_GENERATED: {
       JvmtiExport::post_dynamic_code_generated_internal(
         // if strdup failed give the event a default name
         (_event_data.dynamic_code_generated.name == NULL)
           ? "unknown_code" : _event_data.dynamic_code_generated.name,
         _event_data.dynamic_code_generated.code_begin,
         _event_data.dynamic_code_generated.code_end);
       if (_event_data.dynamic_code_generated.name != NULL) {
         // release our copy
         os::free((void *)_event_data.dynamic_code_generated.name);
       }
       break;
     }
     default:
       ShouldNotReachHere();
   }
 }
 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL;
 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL;
 volatile JvmtiDeferredEventQueue::QueueNode*
     JvmtiDeferredEventQueue::_pending_list = NULL;
 bool JvmtiDeferredEventQueue::has_events() {
   assert(Service_lock->owned_by_self(), "Must own Service_lock");
   return _queue_head != NULL || _pending_list != NULL;
 }
 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) {
   assert(Service_lock->owned_by_self(), "Must own Service_lock");
   process_pending_events();
   // Events get added to the end of the queue (and are pulled off the front).
   QueueNode* node = new QueueNode(event);
   if (_queue_tail == NULL) {
     _queue_tail = _queue_head = node;
   } else {
     assert(_queue_tail->next() == NULL, "Must be the last element in the list");
     _queue_tail->set_next(node);
     _queue_tail = node;
   }
   Service_lock->notify_all();
   assert((_queue_head == NULL) == (_queue_tail == NULL),
          "Inconsistent queue markers");
 }
 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() {
   assert(Service_lock->owned_by_self(), "Must own Service_lock");
   process_pending_events();
   assert(_queue_head != NULL, "Nothing to dequeue");
   if (_queue_head == NULL) {
     // Just in case this happens in product; it shouldn't but let's not crash
     return JvmtiDeferredEvent();
   }
   QueueNode* node = _queue_head;
   _queue_head = _queue_head->next();
   if (_queue_head == NULL) {
     _queue_tail = NULL;
   }
   assert((_queue_head == NULL) == (_queue_tail == NULL),
          "Inconsistent queue markers");
   JvmtiDeferredEvent event = node->event();
   delete node;
   return event;
 }
 void JvmtiDeferredEventQueue::add_pending_event(
     const JvmtiDeferredEvent& event) {
   QueueNode* node = new QueueNode(event);
   bool success = false;
   QueueNode* prev_value = (QueueNode*)_pending_list;
   do {
     node->set_next(prev_value);
     prev_value = (QueueNode*)Atomic::cmpxchg_ptr(
         (void*)node, (volatile void*)&_pending_list, (void*)node->next());
   } while (prev_value != node->next());
 }
 // This method transfers any events that were added by someone NOT holding
 // the lock into the mainline queue.
 void JvmtiDeferredEventQueue::process_pending_events() {
   assert(Service_lock->owned_by_self(), "Must own Service_lock");
   if (_pending_list != NULL) {
     QueueNode* head =
         (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list);
     assert((_queue_head == NULL) == (_queue_tail == NULL),
            "Inconsistent queue markers");
     if (head != NULL) {
       // Since we've treated the pending list as a stack (with newer
       // events at the beginning), we need to join the bottom of the stack
       // with the 'tail' of the queue in order to get the events in the
       // right order.  We do this by reversing the pending list and appending
       // it to the queue.
       QueueNode* new_tail = head;
       QueueNode* new_head = NULL;
       // This reverses the list
       QueueNode* prev = new_tail;
       QueueNode* node = new_tail->next();
       new_tail->set_next(NULL);
       while (node != NULL) {
         QueueNode* next = node->next();
         node->set_next(prev);
         prev = node;
         node = next;
       }
       new_head = prev;
       // Now append the new list to the queue
       if (_queue_tail != NULL) {
         _queue_tail->set_next(new_head);
       } else { // _queue_head == NULL
         _queue_head = new_head;
       }
       _queue_tail = new_tail;
     }
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/jvmtiImpl.cpp@4f9a42c33738 (annotated)

src/share/vm/prims/jvmtiImpl.cpp