Mercurial > hg > graal-compiler
view src/share/vm/prims/jvmtiImpl.cpp @ 1438:a7a0ef3c6858
Added timing printout on VM shutdown.
author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
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date | Mon, 25 Oct 2010 18:35:34 +0200 |
parents | 2f716c0acb64 |
children | c18cbe5936b8 |
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/* * Copyright 2003-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ # include "incls/_precompiled.incl" # include "incls/_jvmtiImpl.cpp.incl" GrowableArray<JvmtiRawMonitor*> *JvmtiPendingMonitors::_monitors = new (ResourceObj::C_HEAP) GrowableArray<JvmtiRawMonitor*>(1,true); void JvmtiPendingMonitors::transition_raw_monitors() { assert((Threads::number_of_threads()==1), "Java thread has not created yet or more than one java thread \ is running. Raw monitor transition will not work"); JavaThread *current_java_thread = JavaThread::current(); assert(current_java_thread->thread_state() == _thread_in_vm, "Must be in vm"); { ThreadBlockInVM __tbivm(current_java_thread); for(int i=0; i< count(); i++) { JvmtiRawMonitor *rmonitor = monitors()->at(i); int r = rmonitor->raw_enter(current_java_thread); assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked"); } } // pending monitors are converted to real monitor so delete them all. dispose(); } // // 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); _cache = NEW_C_HEAP_ARRAY(address,len+1); 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); } void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { _this_obj = this_obj; _listener_fun = listener_fun; _elements = new (ResourceObj::C_HEAP) 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(); // recompute the new cache value after GC for (int i=0; i<len; i++) { _cache[i] = _elements->at(i)->getCacheValue(); } } // // class JvmtiRawMonitor // JvmtiRawMonitor::JvmtiRawMonitor(const char *name) { #ifdef ASSERT _name = strcpy(NEW_C_HEAP_ARRAY(char, strlen(name) + 1), name); #else _name = NULL; #endif _magic = JVMTI_RM_MAGIC; } JvmtiRawMonitor::~JvmtiRawMonitor() { #ifdef ASSERT FreeHeap(_name); #endif _magic = 0; } bool JvmtiRawMonitor::is_valid() { int value = 0; // This object might not be a JvmtiRawMonitor so we can't assume // the _magic field is properly aligned. Get the value in a safe // way and then check against JVMTI_RM_MAGIC. switch (sizeof(_magic)) { case 2: value = Bytes::get_native_u2((address)&_magic); break; case 4: value = Bytes::get_native_u4((address)&_magic); break; case 8: value = Bytes::get_native_u8((address)&_magic); break; default: guarantee(false, "_magic field is an unexpected size"); } return value == JVMTI_RM_MAGIC; } // // class JvmtiBreakpoint // JvmtiBreakpoint::JvmtiBreakpoint() { _method = NULL; _bci = 0; #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(methodOop m_method, jlocation location) { _method = m_method; assert(_method != NULL, "_method != NULL"); _bci = (int) location; #ifdef CHECK_UNHANDLED_OOPS // Could be allocated with new and wouldn't be on the unhandled oop list. Thread *thread = Thread::current(); if (thread->is_in_stack((address)&_method)) { thread->allow_unhandled_oop(&_method); } #endif // CHECK_UNHANDLED_OOPS assert(_bci >= 0, "_bci >= 0"); } void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { _method = bp._method; _bci = bp._bci; } bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { Unimplemented(); return false; } bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { return _method == bp._method && _bci == bp._bci; } bool JvmtiBreakpoint::is_valid() { return _method != NULL && _bci >= 0; } address JvmtiBreakpoint::getBcp() { return _method->bcp_from(_bci); } void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { ((methodOopDesc*)_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 PreviousVersionInfo. Thread *thread = Thread::current(); instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); symbolOop m_name = _method->name(); symbolOop m_signature = _method->signature(); { ResourceMark rm(thread); // PreviousVersionInfo objects returned via PreviousVersionWalker // contain a GrowableArray of handles. We have to clean up the // GrowableArray _after_ the PreviousVersionWalker destructor // has destroyed the handles. { // search previous versions if they exist PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); pv_info != NULL; pv_info = pvw.next_previous_version()) { GrowableArray<methodHandle>* methods = pv_info->prev_EMCP_method_handles(); 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--) { methodHandle method = methods->at(i); if (method->name() == m_name && method->signature() == m_signature) { RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", method->name()->as_C_string(), method->signature()->as_C_string())); assert(!method->is_obsolete(), "only EMCP methods here"); ((methodOopDesc*)method()->*meth_act)(_bci); break; } } } } // pvw is cleaned up } // rm is cleaned up } void JvmtiBreakpoint::set() { each_method_version_do(&methodOopDesc::set_breakpoint); } void JvmtiBreakpoint::clear() { each_method_version_do(&methodOopDesc::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; case CLEAR_ALL_BREAKPOINT: _breakpoints->clearall_at_safepoint(); break; default: assert(false, "Unknown operation"); } } void VM_ChangeBreakpoints::oops_do(OopClosure* f) { // This operation keeps breakpoints alive if (_breakpoints != NULL) { _breakpoints->oops_do(f); } 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(); } } void JvmtiBreakpoints::clearall_at_safepoint() { assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); int len = _bps.length(); for (int i=0; i<len; i++) { _bps.at(i).clear(); } _bps.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(this,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(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); VMThread::execute(&clear_breakpoint); return JVMTI_ERROR_NONE; } void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop 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; } } } } void JvmtiBreakpoints::clearall() { VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); VMThread::execute(&clearall_breakpoint); } // // 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(®_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() || jvf->method()->is_native()) { _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; } symbolHandle ty_sym = oopFactory::new_symbol_handle(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::cast(klass->primary_super_of_depth(idx))->name() == ty_sym()) { return true; } } // Compare secondary supers objArrayOop sec_supers = klass->secondary_supers(); for (idx = 0; idx < sec_supers->length(); idx++) { if (Klass::cast((klassOop) sec_supers->obj_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) { methodOop 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 } symbolOop 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, Klass::cast(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 (!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. VM_DeoptimizeFrame deopt(_jvf->thread(), _jvf->fr().id()); VMThread::execute(&deopt); // 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 { 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 } ///////////////////////////////////////////////////////////////////////////////////////// // // 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()) { #if 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 }