--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/prims/jvmtiImpl.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,1024 @@
+/*
+ * 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;
+}