| /* |
| * Copyright (c) 2003, 2017, 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 "interpreter/oopMapCache.hpp" |
| #include "jvmtifiles/jvmtiEnv.hpp" |
| #include "logging/log.hpp" |
| #include "logging/logStream.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/oop.inline.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); |
| _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); |
| } |
| |
| 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::metadata_do(void f(Metadata*)) { |
| int len = _elements->length(); |
| for (int i=0; i<len; i++) { |
| GrowableElement *e = _elements->at(i); |
| e->metadata_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_holder = NULL; |
| } |
| |
| JvmtiBreakpoint::JvmtiBreakpoint(Method* m_method, jlocation location) { |
| _method = m_method; |
| _class_holder = _method->method_holder()->klass_holder(); |
| #ifdef CHECK_UNHANDLED_OOPS |
| // _class_holder can't be wrapped in a Handle, because JvmtiBreakpoints are |
| // sometimes allocated on the heap. |
| // |
| // The code handling JvmtiBreakpoints allocated on the stack can't be |
| // interrupted by a GC until _class_holder is reachable by the GC via the |
| // oops_do method. |
| Thread::current()->allow_unhandled_oop(&_class_holder); |
| #endif // CHECK_UNHANDLED_OOPS |
| 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_holder = bp._class_holder; |
| } |
| |
| 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() const { |
| 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. |
| Thread *thread = Thread::current(); |
| InstanceKlass* ik = _method->method_holder(); |
| Symbol* m_name = _method->name(); |
| Symbol* m_signature = _method->signature(); |
| |
| // search previous versions if they exist |
| for (InstanceKlass* pv_node = ik->previous_versions(); |
| pv_node != NULL; |
| pv_node = pv_node->previous_versions()) { |
| Array<Method*>* methods = pv_node->methods(); |
| |
| for (int i = methods->length() - 1; i >= 0; i--) { |
| Method* method = methods->at(i); |
| // Only set breakpoints in running EMCP methods. |
| if (method->is_running_emcp() && |
| method->name() == m_name && |
| method->signature() == m_signature) { |
| ResourceMark rm; |
| log_debug(redefine, class, breakpoint) |
| ("%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_on(outputStream* out) const { |
| #ifndef PRODUCT |
| ResourceMark rm; |
| 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(); |
| out->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); |
| } |
| } |
| |
| void VM_ChangeBreakpoints::metadata_do(void f(Metadata*)) { |
| // Walk metadata in breakpoints to keep from being deallocated with RedefineClasses |
| if (_bp != NULL) { |
| _bp->metadata_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::metadata_do(void f(Metadata*)) { |
| _bps.metadata_do(f); |
| } |
| |
| void JvmtiBreakpoints::gc_epilogue() { |
| _bps.gc_epilogue(); |
| } |
| |
| void JvmtiBreakpoints::print() { |
| #ifndef PRODUCT |
| LogTarget(Trace, jvmti) log; |
| LogStream log_stream(log); |
| |
| int n = _bps.length(); |
| for (int i=0; i<n; i++) { |
| JvmtiBreakpoint& bp = _bps.at(i); |
| log_stream.print("%d: ", i); |
| bp.print_on(&log_stream); |
| log_stream.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::metadata_do(void f(Metadata*)) { |
| if (_jvmti_breakpoints != NULL) { |
| _jvmti_breakpoints->metadata_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()) { |
| _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; |
| default: |
| 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(cur_thread, JNIHandles::resolve_external_guard(jobj)); |
| NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); |
| Klass* ob_k = obj->klass(); |
| NULL_CHECK(ob_k, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); |
| |
| if (!is_assignable(signature, ob_k, 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() { |
| InterpreterOopMap oop_mask; |
| _jvf->method()->mask_for(_jvf->bci(), &oop_mask); |
| if (oop_mask.is_dead(_index)) { |
| // The local can be invalid and uninitialized in the scope of current bci |
| _result = JVMTI_ERROR_INVALID_SLOT; |
| return; |
| } |
| 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(Thread::current(), 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); |
| LogStreamHandle(Trace, jvmti) log_stream; |
| log_stream.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 */ |
| log_stream.print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); |
| if (!thread->has_last_Java_frame()) { |
| log_stream.print("no stack"); |
| } |
| log_stream.print(") "); |
| } |
| log_stream.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; |
| |
| bool JvmtiDeferredEventQueue::has_events() { |
| assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
| return _queue_head != NULL; |
| } |
| |
| void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
| assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
| |
| // 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"); |
| |
| 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; |
| } |