aoqi@0: /*
aoqi@0:  * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "classfile/systemDictionary.hpp"
aoqi@0: #include "interpreter/interpreter.hpp"
aoqi@0: #include "jvmtifiles/jvmtiEnv.hpp"
aoqi@0: #include "memory/resourceArea.hpp"
aoqi@0: #include "oops/instanceKlass.hpp"
aoqi@0: #include "prims/jvmtiAgentThread.hpp"
aoqi@0: #include "prims/jvmtiEventController.inline.hpp"
aoqi@0: #include "prims/jvmtiImpl.hpp"
aoqi@0: #include "prims/jvmtiRedefineClasses.hpp"
aoqi@0: #include "runtime/atomic.hpp"
aoqi@0: #include "runtime/deoptimization.hpp"
aoqi@0: #include "runtime/handles.hpp"
aoqi@0: #include "runtime/handles.inline.hpp"
aoqi@0: #include "runtime/interfaceSupport.hpp"
aoqi@0: #include "runtime/javaCalls.hpp"
aoqi@0: #include "runtime/os.hpp"
aoqi@0: #include "runtime/serviceThread.hpp"
aoqi@0: #include "runtime/signature.hpp"
aoqi@0: #include "runtime/thread.inline.hpp"
aoqi@0: #include "runtime/vframe.hpp"
aoqi@0: #include "runtime/vframe_hp.hpp"
aoqi@0: #include "runtime/vm_operations.hpp"
aoqi@0: #include "utilities/exceptions.hpp"
aoqi@0: 
aoqi@0: //
aoqi@0: // class JvmtiAgentThread
aoqi@0: //
aoqi@0: // JavaThread used to wrap a thread started by an agent
aoqi@0: // using the JVMTI method RunAgentThread.
aoqi@0: //
aoqi@0: 
aoqi@0: JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg)
aoqi@0:     : JavaThread(start_function_wrapper) {
aoqi@0:     _env = env;
aoqi@0:     _start_fn = start_fn;
aoqi@0:     _start_arg = start_arg;
aoqi@0: }
aoqi@0: 
aoqi@0: void
aoqi@0: JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) {
aoqi@0:     // It is expected that any Agent threads will be created as
aoqi@0:     // Java Threads.  If this is the case, notification of the creation
aoqi@0:     // of the thread is given in JavaThread::thread_main().
aoqi@0:     assert(thread->is_Java_thread(), "debugger thread should be a Java Thread");
aoqi@0:     assert(thread == JavaThread::current(), "sanity check");
aoqi@0: 
aoqi@0:     JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread;
aoqi@0:     dthread->call_start_function();
aoqi@0: }
aoqi@0: 
aoqi@0: void
aoqi@0: JvmtiAgentThread::call_start_function() {
aoqi@0:     ThreadToNativeFromVM transition(this);
aoqi@0:     _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: //
aoqi@0: // class GrowableCache - private methods
aoqi@0: //
aoqi@0: 
aoqi@0: void GrowableCache::recache() {
aoqi@0:   int len = _elements->length();
aoqi@0: 
aoqi@0:   FREE_C_HEAP_ARRAY(address, _cache, mtInternal);
aoqi@0:   _cache = NEW_C_HEAP_ARRAY(address,len+1, mtInternal);
aoqi@0: 
aoqi@0:   for (int i=0; i<len; i++) {
aoqi@0:     _cache[i] = _elements->at(i)->getCacheValue();
aoqi@0:     //
aoqi@0:     // The cache entry has gone bad. Without a valid frame pointer
aoqi@0:     // value, the entry is useless so we simply delete it in product
aoqi@0:     // mode. The call to remove() will rebuild the cache again
aoqi@0:     // without the bad entry.
aoqi@0:     //
aoqi@0:     if (_cache[i] == NULL) {
aoqi@0:       assert(false, "cannot recache NULL elements");
aoqi@0:       remove(i);
aoqi@0:       return;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   _cache[len] = NULL;
aoqi@0: 
aoqi@0:   _listener_fun(_this_obj,_cache);
aoqi@0: }
aoqi@0: 
aoqi@0: bool GrowableCache::equals(void* v, GrowableElement *e2) {
aoqi@0:   GrowableElement *e1 = (GrowableElement *) v;
aoqi@0:   assert(e1 != NULL, "e1 != NULL");
aoqi@0:   assert(e2 != NULL, "e2 != NULL");
aoqi@0: 
aoqi@0:   return e1->equals(e2);
aoqi@0: }
aoqi@0: 
aoqi@0: //
aoqi@0: // class GrowableCache - public methods
aoqi@0: //
aoqi@0: 
aoqi@0: GrowableCache::GrowableCache() {
aoqi@0:   _this_obj       = NULL;
aoqi@0:   _listener_fun   = NULL;
aoqi@0:   _elements       = NULL;
aoqi@0:   _cache          = NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: GrowableCache::~GrowableCache() {
aoqi@0:   clear();
aoqi@0:   delete _elements;
aoqi@0:   FREE_C_HEAP_ARRAY(address, _cache, mtInternal);
aoqi@0: }
aoqi@0: 
aoqi@0: void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) {
aoqi@0:   _this_obj       = this_obj;
aoqi@0:   _listener_fun   = listener_fun;
aoqi@0:   _elements       = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<GrowableElement*>(5,true);
aoqi@0:   recache();
aoqi@0: }
aoqi@0: 
aoqi@0: // number of elements in the collection
aoqi@0: int GrowableCache::length() {
aoqi@0:   return _elements->length();
aoqi@0: }
aoqi@0: 
aoqi@0: // get the value of the index element in the collection
aoqi@0: GrowableElement* GrowableCache::at(int index) {
aoqi@0:   GrowableElement *e = (GrowableElement *) _elements->at(index);
aoqi@0:   assert(e != NULL, "e != NULL");
aoqi@0:   return e;
aoqi@0: }
aoqi@0: 
aoqi@0: int GrowableCache::find(GrowableElement* e) {
aoqi@0:   return _elements->find(e, GrowableCache::equals);
aoqi@0: }
aoqi@0: 
aoqi@0: // append a copy of the element to the end of the collection
aoqi@0: void GrowableCache::append(GrowableElement* e) {
aoqi@0:   GrowableElement *new_e = e->clone();
aoqi@0:   _elements->append(new_e);
aoqi@0:   recache();
aoqi@0: }
aoqi@0: 
aoqi@0: // insert a copy of the element using lessthan()
aoqi@0: void GrowableCache::insert(GrowableElement* e) {
aoqi@0:   GrowableElement *new_e = e->clone();
aoqi@0:   _elements->append(new_e);
aoqi@0: 
aoqi@0:   int n = length()-2;
aoqi@0:   for (int i=n; i>=0; i--) {
aoqi@0:     GrowableElement *e1 = _elements->at(i);
aoqi@0:     GrowableElement *e2 = _elements->at(i+1);
aoqi@0:     if (e2->lessThan(e1)) {
aoqi@0:       _elements->at_put(i+1, e1);
aoqi@0:       _elements->at_put(i,   e2);
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   recache();
aoqi@0: }
aoqi@0: 
aoqi@0: // remove the element at index
aoqi@0: void GrowableCache::remove (int index) {
aoqi@0:   GrowableElement *e = _elements->at(index);
aoqi@0:   assert(e != NULL, "e != NULL");
aoqi@0:   _elements->remove(e);
aoqi@0:   delete e;
aoqi@0:   recache();
aoqi@0: }
aoqi@0: 
aoqi@0: // clear out all elements, release all heap space and
aoqi@0: // let our listener know that things have changed.
aoqi@0: void GrowableCache::clear() {
aoqi@0:   int len = _elements->length();
aoqi@0:   for (int i=0; i<len; i++) {
aoqi@0:     delete _elements->at(i);
aoqi@0:   }
aoqi@0:   _elements->clear();
aoqi@0:   recache();
aoqi@0: }
aoqi@0: 
aoqi@0: void GrowableCache::oops_do(OopClosure* f) {
aoqi@0:   int len = _elements->length();
aoqi@0:   for (int i=0; i<len; i++) {
aoqi@0:     GrowableElement *e = _elements->at(i);
aoqi@0:     e->oops_do(f);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void GrowableCache::metadata_do(void f(Metadata*)) {
aoqi@0:   int len = _elements->length();
aoqi@0:   for (int i=0; i<len; i++) {
aoqi@0:     GrowableElement *e = _elements->at(i);
aoqi@0:     e->metadata_do(f);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void GrowableCache::gc_epilogue() {
aoqi@0:   int len = _elements->length();
aoqi@0:   for (int i=0; i<len; i++) {
aoqi@0:     _cache[i] = _elements->at(i)->getCacheValue();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: //
aoqi@0: // class JvmtiBreakpoint
aoqi@0: //
aoqi@0: 
aoqi@0: JvmtiBreakpoint::JvmtiBreakpoint() {
aoqi@0:   _method = NULL;
aoqi@0:   _bci    = 0;
aoqi@0:   _class_holder = NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: JvmtiBreakpoint::JvmtiBreakpoint(Method* m_method, jlocation location) {
aoqi@0:   _method        = m_method;
aoqi@0:   _class_holder  = _method->method_holder()->klass_holder();
aoqi@0: #ifdef CHECK_UNHANDLED_OOPS
aoqi@0:   // _class_holder can't be wrapped in a Handle, because JvmtiBreakpoints are
aoqi@0:   // sometimes allocated on the heap.
aoqi@0:   //
aoqi@0:   // The code handling JvmtiBreakpoints allocated on the stack can't be
aoqi@0:   // interrupted by a GC until _class_holder is reachable by the GC via the
aoqi@0:   // oops_do method.
aoqi@0:   Thread::current()->allow_unhandled_oop(&_class_holder);
aoqi@0: #endif // CHECK_UNHANDLED_OOPS
aoqi@0:   assert(_method != NULL, "_method != NULL");
aoqi@0:   _bci           = (int) location;
aoqi@0:   assert(_bci >= 0, "_bci >= 0");
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) {
aoqi@0:   _method   = bp._method;
aoqi@0:   _bci      = bp._bci;
aoqi@0:   _class_holder = bp._class_holder;
aoqi@0: }
aoqi@0: 
aoqi@0: bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) {
aoqi@0:   Unimplemented();
aoqi@0:   return false;
aoqi@0: }
aoqi@0: 
aoqi@0: bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) {
aoqi@0:   return _method   == bp._method
aoqi@0:     &&   _bci      == bp._bci;
aoqi@0: }
aoqi@0: 
aoqi@0: bool JvmtiBreakpoint::is_valid() {
aoqi@0:   // class loader can be NULL
aoqi@0:   return _method != NULL &&
aoqi@0:          _bci >= 0;
aoqi@0: }
aoqi@0: 
aoqi@0: address JvmtiBreakpoint::getBcp() {
aoqi@0:   return _method->bcp_from(_bci);
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiBreakpoint::each_method_version_do(method_action meth_act) {
aoqi@0:   ((Method*)_method->*meth_act)(_bci);
aoqi@0: 
aoqi@0:   // add/remove breakpoint to/from versions of the method that
aoqi@0:   // are EMCP. Directly or transitively obsolete methods are
aoqi@0:   // not saved in the PreviousVersionNodes.
aoqi@0:   Thread *thread = Thread::current();
aoqi@0:   instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder());
aoqi@0:   Symbol* m_name = _method->name();
aoqi@0:   Symbol* m_signature = _method->signature();
aoqi@0: 
aoqi@0:   // search previous versions if they exist
aoqi@0:   PreviousVersionWalker pvw(thread, (InstanceKlass *)ikh());
aoqi@0:   for (PreviousVersionNode * pv_node = pvw.next_previous_version();
aoqi@0:        pv_node != NULL; pv_node = pvw.next_previous_version()) {
aoqi@0:     GrowableArray<Method*>* methods = pv_node->prev_EMCP_methods();
aoqi@0: 
aoqi@0:     if (methods == NULL) {
aoqi@0:       // We have run into a PreviousVersion generation where
aoqi@0:       // all methods were made obsolete during that generation's
aoqi@0:       // RedefineClasses() operation. At the time of that
aoqi@0:       // operation, all EMCP methods were flushed so we don't
aoqi@0:       // have to go back any further.
aoqi@0:       //
aoqi@0:       // A NULL methods array is different than an empty methods
aoqi@0:       // array. We cannot infer any optimizations about older
aoqi@0:       // generations from an empty methods array for the current
aoqi@0:       // generation.
aoqi@0:       break;
aoqi@0:     }
aoqi@0: 
aoqi@0:     for (int i = methods->length() - 1; i >= 0; i--) {
aoqi@0:       Method* method = methods->at(i);
aoqi@0:       // obsolete methods that are running are not deleted from
aoqi@0:       // previous version array, but they are skipped here.
aoqi@0:       if (!method->is_obsolete() &&
aoqi@0:           method->name() == m_name &&
aoqi@0:           method->signature() == m_signature) {
aoqi@0:         RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)",
aoqi@0:           meth_act == &Method::set_breakpoint ? "sett" : "clear",
aoqi@0:           method->name()->as_C_string(),
aoqi@0:           method->signature()->as_C_string()));
aoqi@0: 
aoqi@0:         (method->*meth_act)(_bci);
aoqi@0:         break;
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiBreakpoint::set() {
aoqi@0:   each_method_version_do(&Method::set_breakpoint);
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiBreakpoint::clear() {
aoqi@0:   each_method_version_do(&Method::clear_breakpoint);
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiBreakpoint::print() {
aoqi@0: #ifndef PRODUCT
aoqi@0:   const char *class_name  = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string();
aoqi@0:   const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string();
aoqi@0: 
aoqi@0:   tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp());
aoqi@0: #endif
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: //
aoqi@0: // class VM_ChangeBreakpoints
aoqi@0: //
aoqi@0: // Modify the Breakpoints data structure at a safepoint
aoqi@0: //
aoqi@0: 
aoqi@0: void VM_ChangeBreakpoints::doit() {
aoqi@0:   switch (_operation) {
aoqi@0:   case SET_BREAKPOINT:
aoqi@0:     _breakpoints->set_at_safepoint(*_bp);
aoqi@0:     break;
aoqi@0:   case CLEAR_BREAKPOINT:
aoqi@0:     _breakpoints->clear_at_safepoint(*_bp);
aoqi@0:     break;
aoqi@0:   default:
aoqi@0:     assert(false, "Unknown operation");
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void VM_ChangeBreakpoints::oops_do(OopClosure* f) {
aoqi@0:   // The JvmtiBreakpoints in _breakpoints will be visited via
aoqi@0:   // JvmtiExport::oops_do.
aoqi@0:   if (_bp != NULL) {
aoqi@0:     _bp->oops_do(f);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void VM_ChangeBreakpoints::metadata_do(void f(Metadata*)) {
aoqi@0:   // Walk metadata in breakpoints to keep from being deallocated with RedefineClasses
aoqi@0:   if (_bp != NULL) {
aoqi@0:     _bp->metadata_do(f);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: //
aoqi@0: // class JvmtiBreakpoints
aoqi@0: //
aoqi@0: // a JVMTI internal collection of JvmtiBreakpoint
aoqi@0: //
aoqi@0: 
aoqi@0: JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) {
aoqi@0:   _bps.initialize(this,listener_fun);
aoqi@0: }
aoqi@0: 
aoqi@0: JvmtiBreakpoints:: ~JvmtiBreakpoints() {}
aoqi@0: 
aoqi@0: void  JvmtiBreakpoints::oops_do(OopClosure* f) {
aoqi@0:   _bps.oops_do(f);
aoqi@0: }
aoqi@0: 
aoqi@0: void  JvmtiBreakpoints::metadata_do(void f(Metadata*)) {
aoqi@0:   _bps.metadata_do(f);
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiBreakpoints::gc_epilogue() {
aoqi@0:   _bps.gc_epilogue();
aoqi@0: }
aoqi@0: 
aoqi@0: void  JvmtiBreakpoints::print() {
aoqi@0: #ifndef PRODUCT
aoqi@0:   ResourceMark rm;
aoqi@0: 
aoqi@0:   int n = _bps.length();
aoqi@0:   for (int i=0; i<n; i++) {
aoqi@0:     JvmtiBreakpoint& bp = _bps.at(i);
aoqi@0:     tty->print("%d: ", i);
aoqi@0:     bp.print();
aoqi@0:     tty->cr();
aoqi@0:   }
aoqi@0: #endif
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) {
aoqi@0:   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
aoqi@0: 
aoqi@0:   int i = _bps.find(bp);
aoqi@0:   if (i == -1) {
aoqi@0:     _bps.append(bp);
aoqi@0:     bp.set();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) {
aoqi@0:   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
aoqi@0: 
aoqi@0:   int i = _bps.find(bp);
aoqi@0:   if (i != -1) {
aoqi@0:     _bps.remove(i);
aoqi@0:     bp.clear();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: int JvmtiBreakpoints::length() { return _bps.length(); }
aoqi@0: 
aoqi@0: int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) {
aoqi@0:   if ( _bps.find(bp) != -1) {
aoqi@0:      return JVMTI_ERROR_DUPLICATE;
aoqi@0:   }
aoqi@0:   VM_ChangeBreakpoints set_breakpoint(VM_ChangeBreakpoints::SET_BREAKPOINT, &bp);
aoqi@0:   VMThread::execute(&set_breakpoint);
aoqi@0:   return JVMTI_ERROR_NONE;
aoqi@0: }
aoqi@0: 
aoqi@0: int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) {
aoqi@0:   if ( _bps.find(bp) == -1) {
aoqi@0:      return JVMTI_ERROR_NOT_FOUND;
aoqi@0:   }
aoqi@0: 
aoqi@0:   VM_ChangeBreakpoints clear_breakpoint(VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp);
aoqi@0:   VMThread::execute(&clear_breakpoint);
aoqi@0:   return JVMTI_ERROR_NONE;
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiBreakpoints::clearall_in_class_at_safepoint(Klass* klass) {
aoqi@0:   bool changed = true;
aoqi@0:   // We are going to run thru the list of bkpts
aoqi@0:   // and delete some.  This deletion probably alters
aoqi@0:   // the list in some implementation defined way such
aoqi@0:   // that when we delete entry i, the next entry might
aoqi@0:   // no longer be at i+1.  To be safe, each time we delete
aoqi@0:   // an entry, we'll just start again from the beginning.
aoqi@0:   // We'll stop when we make a pass thru the whole list without
aoqi@0:   // deleting anything.
aoqi@0:   while (changed) {
aoqi@0:     int len = _bps.length();
aoqi@0:     changed = false;
aoqi@0:     for (int i = 0; i < len; i++) {
aoqi@0:       JvmtiBreakpoint& bp = _bps.at(i);
aoqi@0:       if (bp.method()->method_holder() == klass) {
aoqi@0:         bp.clear();
aoqi@0:         _bps.remove(i);
aoqi@0:         // This changed 'i' so we have to start over.
aoqi@0:         changed = true;
aoqi@0:         break;
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: //
aoqi@0: // class JvmtiCurrentBreakpoints
aoqi@0: //
aoqi@0: 
aoqi@0: JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints  = NULL;
aoqi@0: address *         JvmtiCurrentBreakpoints::_breakpoint_list    = NULL;
aoqi@0: 
aoqi@0: 
aoqi@0: JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() {
aoqi@0:   if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints);
aoqi@0:   _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun);
aoqi@0:   assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL");
aoqi@0:   return (*_jvmti_breakpoints);
aoqi@0: }
aoqi@0: 
aoqi@0: void  JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) {
aoqi@0:   JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj;
aoqi@0:   assert(this_jvmti != NULL, "this_jvmti != NULL");
aoqi@0: 
aoqi@0:   debug_only(int n = this_jvmti->length(););
aoqi@0:   assert(cache[n] == NULL, "cache must be NULL terminated");
aoqi@0: 
aoqi@0:   set_breakpoint_list(cache);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) {
aoqi@0:   if (_jvmti_breakpoints != NULL) {
aoqi@0:     _jvmti_breakpoints->oops_do(f);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiCurrentBreakpoints::metadata_do(void f(Metadata*)) {
aoqi@0:   if (_jvmti_breakpoints != NULL) {
aoqi@0:     _jvmti_breakpoints->metadata_do(f);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiCurrentBreakpoints::gc_epilogue() {
aoqi@0:   if (_jvmti_breakpoints != NULL) {
aoqi@0:     _jvmti_breakpoints->gc_epilogue();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: ///////////////////////////////////////////////////////////////
aoqi@0: //
aoqi@0: // class VM_GetOrSetLocal
aoqi@0: //
aoqi@0: 
aoqi@0: // Constructor for non-object getter
aoqi@0: VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type)
aoqi@0:   : _thread(thread)
aoqi@0:   , _calling_thread(NULL)
aoqi@0:   , _depth(depth)
aoqi@0:   , _index(index)
aoqi@0:   , _type(type)
aoqi@0:   , _set(false)
aoqi@0:   , _jvf(NULL)
aoqi@0:   , _result(JVMTI_ERROR_NONE)
aoqi@0: {
aoqi@0: }
aoqi@0: 
aoqi@0: // Constructor for object or non-object setter
aoqi@0: VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value)
aoqi@0:   : _thread(thread)
aoqi@0:   , _calling_thread(NULL)
aoqi@0:   , _depth(depth)
aoqi@0:   , _index(index)
aoqi@0:   , _type(type)
aoqi@0:   , _value(value)
aoqi@0:   , _set(true)
aoqi@0:   , _jvf(NULL)
aoqi@0:   , _result(JVMTI_ERROR_NONE)
aoqi@0: {
aoqi@0: }
aoqi@0: 
aoqi@0: // Constructor for object getter
aoqi@0: VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index)
aoqi@0:   : _thread(thread)
aoqi@0:   , _calling_thread(calling_thread)
aoqi@0:   , _depth(depth)
aoqi@0:   , _index(index)
aoqi@0:   , _type(T_OBJECT)
aoqi@0:   , _set(false)
aoqi@0:   , _jvf(NULL)
aoqi@0:   , _result(JVMTI_ERROR_NONE)
aoqi@0: {
aoqi@0: }
aoqi@0: 
aoqi@0: vframe *VM_GetOrSetLocal::get_vframe() {
aoqi@0:   if (!_thread->has_last_Java_frame()) {
aoqi@0:     return NULL;
aoqi@0:   }
aoqi@0:   RegisterMap reg_map(_thread);
aoqi@0:   vframe *vf = _thread->last_java_vframe(&reg_map);
aoqi@0:   int d = 0;
aoqi@0:   while ((vf != NULL) && (d < _depth)) {
aoqi@0:     vf = vf->java_sender();
aoqi@0:     d++;
aoqi@0:   }
aoqi@0:   return vf;
aoqi@0: }
aoqi@0: 
aoqi@0: javaVFrame *VM_GetOrSetLocal::get_java_vframe() {
aoqi@0:   vframe* vf = get_vframe();
aoqi@0:   if (vf == NULL) {
aoqi@0:     _result = JVMTI_ERROR_NO_MORE_FRAMES;
aoqi@0:     return NULL;
aoqi@0:   }
aoqi@0:   javaVFrame *jvf = (javaVFrame*)vf;
aoqi@0: 
aoqi@0:   if (!vf->is_java_frame()) {
aoqi@0:     _result = JVMTI_ERROR_OPAQUE_FRAME;
aoqi@0:     return NULL;
aoqi@0:   }
aoqi@0:   return jvf;
aoqi@0: }
aoqi@0: 
aoqi@0: // Check that the klass is assignable to a type with the given signature.
aoqi@0: // Another solution could be to use the function Klass::is_subtype_of(type).
aoqi@0: // But the type class can be forced to load/initialize eagerly in such a case.
aoqi@0: // This may cause unexpected consequences like CFLH or class-init JVMTI events.
aoqi@0: // It is better to avoid such a behavior.
aoqi@0: bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) {
aoqi@0:   assert(ty_sign != NULL, "type signature must not be NULL");
aoqi@0:   assert(thread != NULL, "thread must not be NULL");
aoqi@0:   assert(klass != NULL, "klass must not be NULL");
aoqi@0: 
aoqi@0:   int len = (int) strlen(ty_sign);
aoqi@0:   if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name
aoqi@0:     ty_sign++;
aoqi@0:     len -= 2;
aoqi@0:   }
aoqi@0:   TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread);
aoqi@0:   if (klass->name() == ty_sym) {
aoqi@0:     return true;
aoqi@0:   }
aoqi@0:   // Compare primary supers
aoqi@0:   int super_depth = klass->super_depth();
aoqi@0:   int idx;
aoqi@0:   for (idx = 0; idx < super_depth; idx++) {
aoqi@0:     if (klass->primary_super_of_depth(idx)->name() == ty_sym) {
aoqi@0:       return true;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   // Compare secondary supers
aoqi@0:   Array<Klass*>* sec_supers = klass->secondary_supers();
aoqi@0:   for (idx = 0; idx < sec_supers->length(); idx++) {
aoqi@0:     if (((Klass*) sec_supers->at(idx))->name() == ty_sym) {
aoqi@0:       return true;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return false;
aoqi@0: }
aoqi@0: 
aoqi@0: // Checks error conditions:
aoqi@0: //   JVMTI_ERROR_INVALID_SLOT
aoqi@0: //   JVMTI_ERROR_TYPE_MISMATCH
aoqi@0: // Returns: 'true' - everything is Ok, 'false' - error code
aoqi@0: 
aoqi@0: bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) {
aoqi@0:   Method* method_oop = jvf->method();
aoqi@0:   if (!method_oop->has_localvariable_table()) {
aoqi@0:     // Just to check index boundaries
aoqi@0:     jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0;
aoqi@0:     if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) {
aoqi@0:       _result = JVMTI_ERROR_INVALID_SLOT;
aoqi@0:       return false;
aoqi@0:     }
aoqi@0:     return true;
aoqi@0:   }
aoqi@0: 
aoqi@0:   jint num_entries = method_oop->localvariable_table_length();
aoqi@0:   if (num_entries == 0) {
aoqi@0:     _result = JVMTI_ERROR_INVALID_SLOT;
aoqi@0:     return false;       // There are no slots
aoqi@0:   }
aoqi@0:   int signature_idx = -1;
aoqi@0:   int vf_bci = jvf->bci();
aoqi@0:   LocalVariableTableElement* table = method_oop->localvariable_table_start();
aoqi@0:   for (int i = 0; i < num_entries; i++) {
aoqi@0:     int start_bci = table[i].start_bci;
aoqi@0:     int end_bci = start_bci + table[i].length;
aoqi@0: 
aoqi@0:     // Here we assume that locations of LVT entries
aoqi@0:     // with the same slot number cannot be overlapped
aoqi@0:     if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) {
aoqi@0:       signature_idx = (int) table[i].descriptor_cp_index;
aoqi@0:       break;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   if (signature_idx == -1) {
aoqi@0:     _result = JVMTI_ERROR_INVALID_SLOT;
aoqi@0:     return false;       // Incorrect slot index
aoqi@0:   }
aoqi@0:   Symbol*   sign_sym  = method_oop->constants()->symbol_at(signature_idx);
aoqi@0:   const char* signature = (const char *) sign_sym->as_utf8();
aoqi@0:   BasicType slot_type = char2type(signature[0]);
aoqi@0: 
aoqi@0:   switch (slot_type) {
aoqi@0:   case T_BYTE:
aoqi@0:   case T_SHORT:
aoqi@0:   case T_CHAR:
aoqi@0:   case T_BOOLEAN:
aoqi@0:     slot_type = T_INT;
aoqi@0:     break;
aoqi@0:   case T_ARRAY:
aoqi@0:     slot_type = T_OBJECT;
aoqi@0:     break;
aoqi@0:   };
aoqi@0:   if (_type != slot_type) {
aoqi@0:     _result = JVMTI_ERROR_TYPE_MISMATCH;
aoqi@0:     return false;
aoqi@0:   }
aoqi@0: 
aoqi@0:   jobject jobj = _value.l;
aoqi@0:   if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed
aoqi@0:     // Check that the jobject class matches the return type signature.
aoqi@0:     JavaThread* cur_thread = JavaThread::current();
aoqi@0:     HandleMark hm(cur_thread);
aoqi@0: 
aoqi@0:     Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj));
aoqi@0:     NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false));
aoqi@0:     KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass());
aoqi@0:     NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false));
aoqi@0: 
aoqi@0:     if (!is_assignable(signature, ob_kh(), cur_thread)) {
aoqi@0:       _result = JVMTI_ERROR_TYPE_MISMATCH;
aoqi@0:       return false;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return true;
aoqi@0: }
aoqi@0: 
aoqi@0: static bool can_be_deoptimized(vframe* vf) {
aoqi@0:   return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
aoqi@0: }
aoqi@0: 
aoqi@0: bool VM_GetOrSetLocal::doit_prologue() {
aoqi@0:   _jvf = get_java_vframe();
aoqi@0:   NULL_CHECK(_jvf, false);
aoqi@0: 
aoqi@0:   if (_jvf->method()->is_native()) {
aoqi@0:     if (getting_receiver() && !_jvf->method()->is_static()) {
aoqi@0:       return true;
aoqi@0:     } else {
aoqi@0:       _result = JVMTI_ERROR_OPAQUE_FRAME;
aoqi@0:       return false;
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (!check_slot_type(_jvf)) {
aoqi@0:     return false;
aoqi@0:   }
aoqi@0:   return true;
aoqi@0: }
aoqi@0: 
aoqi@0: void VM_GetOrSetLocal::doit() {
aoqi@0:   if (_set) {
aoqi@0:     // Force deoptimization of frame if compiled because it's
aoqi@0:     // possible the compiler emitted some locals as constant values,
aoqi@0:     // meaning they are not mutable.
aoqi@0:     if (can_be_deoptimized(_jvf)) {
aoqi@0: 
aoqi@0:       // Schedule deoptimization so that eventually the local
aoqi@0:       // update will be written to an interpreter frame.
aoqi@0:       Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id());
aoqi@0: 
aoqi@0:       // Now store a new value for the local which will be applied
aoqi@0:       // once deoptimization occurs. Note however that while this
aoqi@0:       // write is deferred until deoptimization actually happens
aoqi@0:       // can vframe created after this point will have its locals
aoqi@0:       // reflecting this update so as far as anyone can see the
aoqi@0:       // write has already taken place.
aoqi@0: 
aoqi@0:       // If we are updating an oop then get the oop from the handle
aoqi@0:       // since the handle will be long gone by the time the deopt
aoqi@0:       // happens. The oop stored in the deferred local will be
aoqi@0:       // gc'd on its own.
aoqi@0:       if (_type == T_OBJECT) {
aoqi@0:         _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l));
aoqi@0:       }
aoqi@0:       // Re-read the vframe so we can see that it is deoptimized
aoqi@0:       // [ Only need because of assert in update_local() ]
aoqi@0:       _jvf = get_java_vframe();
aoqi@0:       ((compiledVFrame*)_jvf)->update_local(_type, _index, _value);
aoqi@0:       return;
aoqi@0:     }
aoqi@0:     StackValueCollection *locals = _jvf->locals();
aoqi@0:     HandleMark hm;
aoqi@0: 
aoqi@0:     switch (_type) {
aoqi@0:       case T_INT:    locals->set_int_at   (_index, _value.i); break;
aoqi@0:       case T_LONG:   locals->set_long_at  (_index, _value.j); break;
aoqi@0:       case T_FLOAT:  locals->set_float_at (_index, _value.f); break;
aoqi@0:       case T_DOUBLE: locals->set_double_at(_index, _value.d); break;
aoqi@0:       case T_OBJECT: {
aoqi@0:         Handle ob_h(JNIHandles::resolve_external_guard(_value.l));
aoqi@0:         locals->set_obj_at (_index, ob_h);
aoqi@0:         break;
aoqi@0:       }
aoqi@0:       default: ShouldNotReachHere();
aoqi@0:     }
aoqi@0:     _jvf->set_locals(locals);
aoqi@0:   } else {
aoqi@0:     if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) {
aoqi@0:       assert(getting_receiver(), "Can only get here when getting receiver");
aoqi@0:       oop receiver = _jvf->fr().get_native_receiver();
aoqi@0:       _value.l = JNIHandles::make_local(_calling_thread, receiver);
aoqi@0:     } else {
aoqi@0:       StackValueCollection *locals = _jvf->locals();
aoqi@0: 
aoqi@0:       if (locals->at(_index)->type() == T_CONFLICT) {
aoqi@0:         memset(&_value, 0, sizeof(_value));
aoqi@0:         _value.l = NULL;
aoqi@0:         return;
aoqi@0:       }
aoqi@0: 
aoqi@0:       switch (_type) {
aoqi@0:         case T_INT:    _value.i = locals->int_at   (_index);   break;
aoqi@0:         case T_LONG:   _value.j = locals->long_at  (_index);   break;
aoqi@0:         case T_FLOAT:  _value.f = locals->float_at (_index);   break;
aoqi@0:         case T_DOUBLE: _value.d = locals->double_at(_index);   break;
aoqi@0:         case T_OBJECT: {
aoqi@0:           // Wrap the oop to be returned in a local JNI handle since
aoqi@0:           // oops_do() no longer applies after doit() is finished.
aoqi@0:           oop obj = locals->obj_at(_index)();
aoqi@0:           _value.l = JNIHandles::make_local(_calling_thread, obj);
aoqi@0:           break;
aoqi@0:         }
aoqi@0:         default: ShouldNotReachHere();
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: bool VM_GetOrSetLocal::allow_nested_vm_operations() const {
aoqi@0:   return true; // May need to deoptimize
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: VM_GetReceiver::VM_GetReceiver(
aoqi@0:     JavaThread* thread, JavaThread* caller_thread, jint depth)
aoqi@0:     : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {}
aoqi@0: 
aoqi@0: /////////////////////////////////////////////////////////////////////////////////////////
aoqi@0: 
aoqi@0: //
aoqi@0: // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp
aoqi@0: //
aoqi@0: 
aoqi@0: bool JvmtiSuspendControl::suspend(JavaThread *java_thread) {
aoqi@0:   // external suspend should have caught suspending a thread twice
aoqi@0: 
aoqi@0:   // Immediate suspension required for JPDA back-end so JVMTI agent threads do
aoqi@0:   // not deadlock due to later suspension on transitions while holding
aoqi@0:   // raw monitors.  Passing true causes the immediate suspension.
aoqi@0:   // java_suspend() will catch threads in the process of exiting
aoqi@0:   // and will ignore them.
aoqi@0:   java_thread->java_suspend();
aoqi@0: 
aoqi@0:   // It would be nice to have the following assertion in all the time,
aoqi@0:   // but it is possible for a racing resume request to have resumed
aoqi@0:   // this thread right after we suspended it. Temporarily enable this
aoqi@0:   // assertion if you are chasing a different kind of bug.
aoqi@0:   //
aoqi@0:   // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL ||
aoqi@0:   //   java_thread->is_being_ext_suspended(), "thread is not suspended");
aoqi@0: 
aoqi@0:   if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) {
aoqi@0:     // check again because we can get delayed in java_suspend():
aoqi@0:     // the thread is in process of exiting.
aoqi@0:     return false;
aoqi@0:   }
aoqi@0: 
aoqi@0:   return true;
aoqi@0: }
aoqi@0: 
aoqi@0: bool JvmtiSuspendControl::resume(JavaThread *java_thread) {
aoqi@0:   // external suspend should have caught resuming a thread twice
aoqi@0:   assert(java_thread->is_being_ext_suspended(), "thread should be suspended");
aoqi@0: 
aoqi@0:   // resume thread
aoqi@0:   {
aoqi@0:     // must always grab Threads_lock, see JVM_SuspendThread
aoqi@0:     MutexLocker ml(Threads_lock);
aoqi@0:     java_thread->java_resume();
aoqi@0:   }
aoqi@0: 
aoqi@0:   return true;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: void JvmtiSuspendControl::print() {
aoqi@0: #ifndef PRODUCT
aoqi@0:   MutexLocker mu(Threads_lock);
aoqi@0:   ResourceMark rm;
aoqi@0: 
aoqi@0:   tty->print("Suspended Threads: [");
aoqi@0:   for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
aoqi@0: #ifdef JVMTI_TRACE
aoqi@0:     const char *name   = JvmtiTrace::safe_get_thread_name(thread);
aoqi@0: #else
aoqi@0:     const char *name   = "";
aoqi@0: #endif /*JVMTI_TRACE */
aoqi@0:     tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_');
aoqi@0:     if (!thread->has_last_Java_frame()) {
aoqi@0:       tty->print("no stack");
aoqi@0:     }
aoqi@0:     tty->print(") ");
aoqi@0:   }
aoqi@0:   tty->print_cr("]");
aoqi@0: #endif
aoqi@0: }
aoqi@0: 
aoqi@0: JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event(
aoqi@0:     nmethod* nm) {
aoqi@0:   JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD);
aoqi@0:   event._event_data.compiled_method_load = nm;
aoqi@0:   // Keep the nmethod alive until the ServiceThread can process
aoqi@0:   // this deferred event.
aoqi@0:   nmethodLocker::lock_nmethod(nm);
aoqi@0:   return event;
aoqi@0: }
aoqi@0: 
aoqi@0: JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event(
aoqi@0:     nmethod* nm, jmethodID id, const void* code) {
aoqi@0:   JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD);
aoqi@0:   event._event_data.compiled_method_unload.nm = nm;
aoqi@0:   event._event_data.compiled_method_unload.method_id = id;
aoqi@0:   event._event_data.compiled_method_unload.code_begin = code;
aoqi@0:   // Keep the nmethod alive until the ServiceThread can process
aoqi@0:   // this deferred event. This will keep the memory for the
aoqi@0:   // generated code from being reused too early. We pass
aoqi@0:   // zombie_ok == true here so that our nmethod that was just
aoqi@0:   // made into a zombie can be locked.
aoqi@0:   nmethodLocker::lock_nmethod(nm, true /* zombie_ok */);
aoqi@0:   return event;
aoqi@0: }
aoqi@0: 
aoqi@0: JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event(
aoqi@0:       const char* name, const void* code_begin, const void* code_end) {
aoqi@0:   JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED);
aoqi@0:   // Need to make a copy of the name since we don't know how long
aoqi@0:   // the event poster will keep it around after we enqueue the
aoqi@0:   // deferred event and return. strdup() failure is handled in
aoqi@0:   // the post() routine below.
aoqi@0:   event._event_data.dynamic_code_generated.name = os::strdup(name);
aoqi@0:   event._event_data.dynamic_code_generated.code_begin = code_begin;
aoqi@0:   event._event_data.dynamic_code_generated.code_end = code_end;
aoqi@0:   return event;
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiDeferredEvent::post() {
aoqi@0:   assert(ServiceThread::is_service_thread(Thread::current()),
aoqi@0:          "Service thread must post enqueued events");
aoqi@0:   switch(_type) {
aoqi@0:     case TYPE_COMPILED_METHOD_LOAD: {
aoqi@0:       nmethod* nm = _event_data.compiled_method_load;
aoqi@0:       JvmtiExport::post_compiled_method_load(nm);
aoqi@0:       // done with the deferred event so unlock the nmethod
aoqi@0:       nmethodLocker::unlock_nmethod(nm);
aoqi@0:       break;
aoqi@0:     }
aoqi@0:     case TYPE_COMPILED_METHOD_UNLOAD: {
aoqi@0:       nmethod* nm = _event_data.compiled_method_unload.nm;
aoqi@0:       JvmtiExport::post_compiled_method_unload(
aoqi@0:         _event_data.compiled_method_unload.method_id,
aoqi@0:         _event_data.compiled_method_unload.code_begin);
aoqi@0:       // done with the deferred event so unlock the nmethod
aoqi@0:       nmethodLocker::unlock_nmethod(nm);
aoqi@0:       break;
aoqi@0:     }
aoqi@0:     case TYPE_DYNAMIC_CODE_GENERATED: {
aoqi@0:       JvmtiExport::post_dynamic_code_generated_internal(
aoqi@0:         // if strdup failed give the event a default name
aoqi@0:         (_event_data.dynamic_code_generated.name == NULL)
aoqi@0:           ? "unknown_code" : _event_data.dynamic_code_generated.name,
aoqi@0:         _event_data.dynamic_code_generated.code_begin,
aoqi@0:         _event_data.dynamic_code_generated.code_end);
aoqi@0:       if (_event_data.dynamic_code_generated.name != NULL) {
aoqi@0:         // release our copy
aoqi@0:         os::free((void *)_event_data.dynamic_code_generated.name);
aoqi@0:       }
aoqi@0:       break;
aoqi@0:     }
aoqi@0:     default:
aoqi@0:       ShouldNotReachHere();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL;
aoqi@0: JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL;
aoqi@0: 
aoqi@0: volatile JvmtiDeferredEventQueue::QueueNode*
aoqi@0:     JvmtiDeferredEventQueue::_pending_list = NULL;
aoqi@0: 
aoqi@0: bool JvmtiDeferredEventQueue::has_events() {
aoqi@0:   assert(Service_lock->owned_by_self(), "Must own Service_lock");
aoqi@0:   return _queue_head != NULL || _pending_list != NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) {
aoqi@0:   assert(Service_lock->owned_by_self(), "Must own Service_lock");
aoqi@0: 
aoqi@0:   process_pending_events();
aoqi@0: 
aoqi@0:   // Events get added to the end of the queue (and are pulled off the front).
aoqi@0:   QueueNode* node = new QueueNode(event);
aoqi@0:   if (_queue_tail == NULL) {
aoqi@0:     _queue_tail = _queue_head = node;
aoqi@0:   } else {
aoqi@0:     assert(_queue_tail->next() == NULL, "Must be the last element in the list");
aoqi@0:     _queue_tail->set_next(node);
aoqi@0:     _queue_tail = node;
aoqi@0:   }
aoqi@0: 
aoqi@0:   Service_lock->notify_all();
aoqi@0:   assert((_queue_head == NULL) == (_queue_tail == NULL),
aoqi@0:          "Inconsistent queue markers");
aoqi@0: }
aoqi@0: 
aoqi@0: JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() {
aoqi@0:   assert(Service_lock->owned_by_self(), "Must own Service_lock");
aoqi@0: 
aoqi@0:   process_pending_events();
aoqi@0: 
aoqi@0:   assert(_queue_head != NULL, "Nothing to dequeue");
aoqi@0: 
aoqi@0:   if (_queue_head == NULL) {
aoqi@0:     // Just in case this happens in product; it shouldn't but let's not crash
aoqi@0:     return JvmtiDeferredEvent();
aoqi@0:   }
aoqi@0: 
aoqi@0:   QueueNode* node = _queue_head;
aoqi@0:   _queue_head = _queue_head->next();
aoqi@0:   if (_queue_head == NULL) {
aoqi@0:     _queue_tail = NULL;
aoqi@0:   }
aoqi@0: 
aoqi@0:   assert((_queue_head == NULL) == (_queue_tail == NULL),
aoqi@0:          "Inconsistent queue markers");
aoqi@0: 
aoqi@0:   JvmtiDeferredEvent event = node->event();
aoqi@0:   delete node;
aoqi@0:   return event;
aoqi@0: }
aoqi@0: 
aoqi@0: void JvmtiDeferredEventQueue::add_pending_event(
aoqi@0:     const JvmtiDeferredEvent& event) {
aoqi@0: 
aoqi@0:   QueueNode* node = new QueueNode(event);
aoqi@0: 
aoqi@0:   bool success = false;
aoqi@0:   QueueNode* prev_value = (QueueNode*)_pending_list;
aoqi@0:   do {
aoqi@0:     node->set_next(prev_value);
aoqi@0:     prev_value = (QueueNode*)Atomic::cmpxchg_ptr(
aoqi@0:         (void*)node, (volatile void*)&_pending_list, (void*)node->next());
aoqi@0:   } while (prev_value != node->next());
aoqi@0: }
aoqi@0: 
aoqi@0: // This method transfers any events that were added by someone NOT holding
aoqi@0: // the lock into the mainline queue.
aoqi@0: void JvmtiDeferredEventQueue::process_pending_events() {
aoqi@0:   assert(Service_lock->owned_by_self(), "Must own Service_lock");
aoqi@0: 
aoqi@0:   if (_pending_list != NULL) {
aoqi@0:     QueueNode* head =
aoqi@0:         (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list);
aoqi@0: 
aoqi@0:     assert((_queue_head == NULL) == (_queue_tail == NULL),
aoqi@0:            "Inconsistent queue markers");
aoqi@0: 
aoqi@0:     if (head != NULL) {
aoqi@0:       // Since we've treated the pending list as a stack (with newer
aoqi@0:       // events at the beginning), we need to join the bottom of the stack
aoqi@0:       // with the 'tail' of the queue in order to get the events in the
aoqi@0:       // right order.  We do this by reversing the pending list and appending
aoqi@0:       // it to the queue.
aoqi@0: 
aoqi@0:       QueueNode* new_tail = head;
aoqi@0:       QueueNode* new_head = NULL;
aoqi@0: 
aoqi@0:       // This reverses the list
aoqi@0:       QueueNode* prev = new_tail;
aoqi@0:       QueueNode* node = new_tail->next();
aoqi@0:       new_tail->set_next(NULL);
aoqi@0:       while (node != NULL) {
aoqi@0:         QueueNode* next = node->next();
aoqi@0:         node->set_next(prev);
aoqi@0:         prev = node;
aoqi@0:         node = next;
aoqi@0:       }
aoqi@0:       new_head = prev;
aoqi@0: 
aoqi@0:       // Now append the new list to the queue
aoqi@0:       if (_queue_tail != NULL) {
aoqi@0:         _queue_tail->set_next(new_head);
aoqi@0:       } else { // _queue_head == NULL
aoqi@0:         _queue_head = new_head;
aoqi@0:       }
aoqi@0:       _queue_tail = new_tail;
aoqi@0:     }
aoqi@0:   }
aoqi@0: }