/* * Copyright (c) 1997, 2015, 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/javaClasses.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "code/codeCache.hpp" #include "code/debugInfoRec.hpp" #include "code/nmethod.hpp" #include "code/pcDesc.hpp" #include "code/scopeDesc.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/oopMapCache.hpp" #include "memory/resourceArea.hpp" #include "oops/instanceKlass.hpp" #include "oops/oop.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/objectMonitor.hpp" #include "runtime/objectMonitor.inline.hpp" #include "runtime/signature.hpp" #include "runtime/stubRoutines.hpp" #include "runtime/synchronizer.hpp" #include "runtime/vframe.hpp" #include "runtime/vframeArray.hpp" #include "runtime/vframe_hp.hpp" PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC vframe::vframe(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : _reg_map(reg_map), _thread(thread) { assert(fr != NULL, "must have frame"); _fr = *fr; } vframe::vframe(const frame* fr, JavaThread* thread) : _reg_map(thread), _thread(thread) { assert(fr != NULL, "must have frame"); _fr = *fr; } vframe* vframe::new_vframe(const frame* f, const RegisterMap* reg_map, JavaThread* thread) { // Interpreter frame if (f->is_interpreted_frame()) { return new interpretedVFrame(f, reg_map, thread); } // Compiled frame CodeBlob* cb = f->cb(); if (cb != NULL) { if (cb->is_nmethod()) { nmethod* nm = (nmethod*)cb; return new compiledVFrame(f, reg_map, thread, nm); } if (f->is_runtime_frame()) { // Skip this frame and try again. RegisterMap temp_map = *reg_map; frame s = f->sender(&temp_map); return new_vframe(&s, &temp_map, thread); } } // External frame return new externalVFrame(f, reg_map, thread); } vframe* vframe::sender() const { RegisterMap temp_map = *register_map(); assert(is_top(), "just checking"); if (_fr.is_entry_frame() && _fr.is_first_frame()) return NULL; frame s = _fr.real_sender(&temp_map); if (s.is_first_frame()) return NULL; return vframe::new_vframe(&s, &temp_map, thread()); } vframe* vframe::top() const { vframe* vf = (vframe*) this; while (!vf->is_top()) vf = vf->sender(); return vf; } javaVFrame* vframe::java_sender() const { vframe* f = sender(); while (f != NULL) { if (f->is_java_frame()) return javaVFrame::cast(f); f = f->sender(); } return NULL; } // ------------- javaVFrame -------------- GrowableArray* javaVFrame::locked_monitors() { assert(SafepointSynchronize::is_at_safepoint() || JavaThread::current() == thread(), "must be at safepoint or it's a java frame of the current thread"); GrowableArray* mons = monitors(); GrowableArray* result = new GrowableArray(mons->length()); if (mons->is_empty()) return result; bool found_first_monitor = false; ObjectMonitor *pending_monitor = thread()->current_pending_monitor(); ObjectMonitor *waiting_monitor = thread()->current_waiting_monitor(); oop pending_obj = (pending_monitor != NULL ? (oop) pending_monitor->object() : (oop) NULL); oop waiting_obj = (waiting_monitor != NULL ? (oop) waiting_monitor->object() : (oop) NULL); for (int index = (mons->length()-1); index >= 0; index--) { MonitorInfo* monitor = mons->at(index); if (monitor->eliminated() && is_compiled_frame()) continue; // skip eliminated monitor oop obj = monitor->owner(); if (obj == NULL) continue; // skip unowned monitor // // Skip the monitor that the thread is blocked to enter or waiting on // if (!found_first_monitor && (obj == pending_obj || obj == waiting_obj)) { continue; } found_first_monitor = true; result->append(monitor); } return result; } static void print_locked_object_class_name(outputStream* st, Handle obj, const char* lock_state) { if (obj.not_null()) { st->print("\t- %s <" INTPTR_FORMAT "> ", lock_state, (address)obj()); if (obj->klass() == SystemDictionary::Class_klass()) { Klass* target_klass = java_lang_Class::as_Klass(obj()); st->print_cr("(a java.lang.Class for %s)", InstanceKlass::cast(target_klass)->external_name()); } else { Klass* k = obj->klass(); st->print_cr("(a %s)", k->external_name()); } } } void javaVFrame::print_lock_info_on(outputStream* st, int frame_count) { ResourceMark rm; // If this is the first frame, and java.lang.Object.wait(...) then print out the receiver. if (frame_count == 0) { if (method()->name() == vmSymbols::wait_name() && method()->method_holder()->name() == vmSymbols::java_lang_Object()) { StackValueCollection* locs = locals(); if (!locs->is_empty()) { StackValue* sv = locs->at(0); if (sv->type() == T_OBJECT) { Handle o = locs->at(0)->get_obj(); print_locked_object_class_name(st, o, "waiting on"); } } } else if (thread()->current_park_blocker() != NULL) { oop obj = thread()->current_park_blocker(); Klass* k = obj->klass(); st->print_cr("\t- %s <" INTPTR_FORMAT "> (a %s)", "parking to wait for ", (address)obj, k->external_name()); } } // Print out all monitors that we have locked or are trying to lock GrowableArray* mons = monitors(); if (!mons->is_empty()) { bool found_first_monitor = false; for (int index = (mons->length()-1); index >= 0; index--) { MonitorInfo* monitor = mons->at(index); if (monitor->eliminated() && is_compiled_frame()) { // Eliminated in compiled code if (monitor->owner_is_scalar_replaced()) { Klass* k = java_lang_Class::as_Klass(monitor->owner_klass()); // format below for lockbits matches this one. st->print("\t- eliminated (a %s)", k->external_name()); } else { oop obj = monitor->owner(); if (obj != NULL) { print_locked_object_class_name(st, obj, "eliminated"); } } continue; } if (monitor->owner() != NULL) { // the monitor is associated with an object, i.e., it is locked // First, assume we have the monitor locked. If we haven't found an // owned monitor before and this is the first frame, then we need to // see if we have completed the lock or we are blocked trying to // acquire it - we can only be blocked if the monitor is inflated markOop mark = NULL; const char *lock_state = "locked"; // assume we have the monitor locked if (!found_first_monitor && frame_count == 0) { mark = monitor->owner()->mark(); if (mark->has_monitor() && ( // we have marked ourself as pending on this monitor mark->monitor() == thread()->current_pending_monitor() || // we are not the owner of this monitor !mark->monitor()->is_entered(thread()) )) { lock_state = "waiting to lock"; } else { mark = NULL; // Disable printing below } } print_locked_object_class_name(st, monitor->owner(), lock_state); if (Verbose && mark != NULL) { // match with format above, replacing "-" with " ". st->print("\t lockbits="); mark->print_on(st); st->cr(); } found_first_monitor = true; } } } } // ------------- interpretedVFrame -------------- u_char* interpretedVFrame::bcp() const { return fr().interpreter_frame_bcp(); } void interpretedVFrame::set_bcp(u_char* bcp) { fr().interpreter_frame_set_bcp(bcp); } intptr_t* interpretedVFrame::locals_addr_at(int offset) const { assert(fr().is_interpreted_frame(), "frame should be an interpreted frame"); return fr().interpreter_frame_local_at(offset); } GrowableArray* interpretedVFrame::monitors() const { GrowableArray* result = new GrowableArray(5); for (BasicObjectLock* current = (fr().previous_monitor_in_interpreter_frame(fr().interpreter_frame_monitor_begin())); current >= fr().interpreter_frame_monitor_end(); current = fr().previous_monitor_in_interpreter_frame(current)) { result->push(new MonitorInfo(current->obj(), current->lock(), false, false)); } return result; } int interpretedVFrame::bci() const { return method()->bci_from(bcp()); } Method* interpretedVFrame::method() const { return fr().interpreter_frame_method(); } static StackValue* create_stack_value_from_oop_map(const InterpreterOopMap& oop_mask, int index, const intptr_t* const addr) { assert(index >= 0 && index < oop_mask.number_of_entries(), "invariant"); // categorize using oop_mask if (oop_mask.is_oop(index)) { // reference (oop) "r" Handle h(addr != NULL ? (*(oop*)addr) : (oop)NULL); return new StackValue(h); } // value (integer) "v" return new StackValue(addr != NULL ? *addr : 0); } static bool is_in_expression_stack(const frame& fr, const intptr_t* const addr) { assert(addr != NULL, "invariant"); // Ensure to be 'inside' the expresion stack (i.e., addr >= sp for Intel). // In case of exceptions, the expression stack is invalid and the sp // will be reset to express this condition. if (frame::interpreter_frame_expression_stack_direction() > 0) { return addr <= fr.interpreter_frame_tos_address(); } return addr >= fr.interpreter_frame_tos_address(); } static void stack_locals(StackValueCollection* result, int length, const InterpreterOopMap& oop_mask, const frame& fr) { assert(result != NULL, "invariant"); for (int i = 0; i < length; ++i) { const intptr_t* const addr = fr.interpreter_frame_local_at(i); assert(addr != NULL, "invariant"); assert(addr >= fr.sp(), "must be inside the frame"); StackValue* const sv = create_stack_value_from_oop_map(oop_mask, i, addr); assert(sv != NULL, "sanity check"); result->add(sv); } } static void stack_expressions(StackValueCollection* result, int length, int max_locals, const InterpreterOopMap& oop_mask, const frame& fr) { assert(result != NULL, "invariant"); for (int i = 0; i < length; ++i) { const intptr_t* addr = fr.interpreter_frame_expression_stack_at(i); assert(addr != NULL, "invariant"); if (!is_in_expression_stack(fr, addr)) { // Need to ensure no bogus escapes. addr = NULL; } StackValue* const sv = create_stack_value_from_oop_map(oop_mask, i + max_locals, addr); assert(sv != NULL, "sanity check"); result->add(sv); } } StackValueCollection* interpretedVFrame::locals() const { return stack_data(false); } StackValueCollection* interpretedVFrame::expressions() const { return stack_data(true); } /* * Worker routine for fetching references and/or values * for a particular bci in the interpretedVFrame. * * Returns data for either "locals" or "expressions", * using bci relative oop_map (oop_mask) information. * * @param expressions bool switch controlling what data to return (false == locals / true == expressions) * */ StackValueCollection* interpretedVFrame::stack_data(bool expressions) const { InterpreterOopMap oop_mask; // oopmap for current bci if (TraceDeoptimization && Verbose) { methodHandle m_h(Thread::current(), method()); OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask); } else { method()->mask_for(bci(), &oop_mask); } const int mask_len = oop_mask.number_of_entries(); // If the method is native, method()->max_locals() is not telling the truth. // For our purposes, max locals instead equals the size of parameters. const int max_locals = method()->is_native() ? method()->size_of_parameters() : method()->max_locals(); assert(mask_len >= max_locals, "invariant"); const int length = expressions ? mask_len - max_locals : max_locals; assert(length >= 0, "invariant"); StackValueCollection* const result = new StackValueCollection(length); if (0 == length) { return result; } if (expressions) { stack_expressions(result, length, max_locals, oop_mask, fr()); } else { stack_locals(result, length, oop_mask, fr()); } assert(length == result->size(), "invariant"); return result; } void interpretedVFrame::set_locals(StackValueCollection* values) const { if (values == NULL || values->size() == 0) return; // If the method is native, max_locals is not telling the truth. // maxlocals then equals the size of parameters const int max_locals = method()->is_native() ? method()->size_of_parameters() : method()->max_locals(); assert(max_locals == values->size(), "Mismatch between actual stack format and supplied data"); // handle locals for (int i = 0; i < max_locals; i++) { // Find stack location intptr_t *addr = locals_addr_at(i); // Depending on oop/int put it in the right package const StackValue* const sv = values->at(i); assert(sv != NULL, "sanity check"); if (sv->type() == T_OBJECT) { *(oop *) addr = (sv->get_obj())(); } else { // integer *addr = sv->get_int(); } } } // ------------- cChunk -------------- entryVFrame::entryVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : externalVFrame(fr, reg_map, thread) {} void vframeStreamCommon::found_bad_method_frame() { // 6379830 Cut point for an assertion that occasionally fires when // we are using the performance analyzer. // Disable this assert when testing the analyzer with fastdebug. // -XX:SuppressErrorAt=vframe.cpp:XXX (XXX=following line number) assert(false, "invalid bci or invalid scope desc"); } // top-frame will be skipped vframeStream::vframeStream(JavaThread* thread, frame top_frame, bool stop_at_java_call_stub) : vframeStreamCommon(thread) { _stop_at_java_call_stub = stop_at_java_call_stub; // skip top frame, as it may not be at safepoint _frame = top_frame.sender(&_reg_map); while (!fill_from_frame()) { _frame = _frame.sender(&_reg_map); } } // Step back n frames, skip any pseudo frames in between. // This function is used in Class.forName, Class.newInstance, Method.Invoke, // AccessController.doPrivileged. void vframeStreamCommon::security_get_caller_frame(int depth) { assert(depth >= 0, err_msg("invalid depth: %d", depth)); for (int n = 0; !at_end(); security_next()) { if (!method()->is_ignored_by_security_stack_walk()) { if (n == depth) { // We have reached the desired depth; return. return; } n++; // this is a non-skipped frame; count it against the depth } } // NOTE: At this point there were not enough frames on the stack // to walk to depth. Callers of this method have to check for at_end. } void vframeStreamCommon::security_next() { if (method()->is_prefixed_native()) { skip_prefixed_method_and_wrappers(); // calls next() } else { next(); } } void vframeStreamCommon::skip_prefixed_method_and_wrappers() { ResourceMark rm; HandleMark hm; int method_prefix_count = 0; char** method_prefixes = JvmtiExport::get_all_native_method_prefixes(&method_prefix_count); KlassHandle prefixed_klass(method()->method_holder()); const char* prefixed_name = method()->name()->as_C_string(); size_t prefixed_name_len = strlen(prefixed_name); int prefix_index = method_prefix_count-1; while (!at_end()) { next(); if (method()->method_holder() != prefixed_klass()) { break; // classes don't match, can't be a wrapper } const char* name = method()->name()->as_C_string(); size_t name_len = strlen(name); size_t prefix_len = prefixed_name_len - name_len; if (prefix_len <= 0 || strcmp(name, prefixed_name + prefix_len) != 0) { break; // prefixed name isn't prefixed version of method name, can't be a wrapper } for (; prefix_index >= 0; --prefix_index) { const char* possible_prefix = method_prefixes[prefix_index]; size_t possible_prefix_len = strlen(possible_prefix); if (possible_prefix_len == prefix_len && strncmp(possible_prefix, prefixed_name, prefix_len) == 0) { break; // matching prefix found } } if (prefix_index < 0) { break; // didn't find the prefix, can't be a wrapper } prefixed_name = name; prefixed_name_len = name_len; } } void vframeStreamCommon::skip_reflection_related_frames() { while (!at_end() && (JDK_Version::is_gte_jdk14x_version() && UseNewReflection && (method()->method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass()) || method()->method_holder()->is_subclass_of(SystemDictionary::reflect_ConstructorAccessorImpl_klass())))) { next(); } } #ifndef PRODUCT void vframe::print() { if (WizardMode) _fr.print_value_on(tty,NULL); } void vframe::print_value() const { ((vframe*)this)->print(); } void entryVFrame::print_value() const { ((entryVFrame*)this)->print(); } void entryVFrame::print() { vframe::print(); tty->print_cr("C Chunk inbetween Java"); tty->print_cr("C link " INTPTR_FORMAT, _fr.link()); } // ------------- javaVFrame -------------- static void print_stack_values(const char* title, StackValueCollection* values) { if (values->is_empty()) return; tty->print_cr("\t%s:", title); values->print(); } void javaVFrame::print() { ResourceMark rm; vframe::print(); tty->print("\t"); method()->print_value(); tty->cr(); tty->print_cr("\tbci: %d", bci()); print_stack_values("locals", locals()); print_stack_values("expressions", expressions()); GrowableArray* list = monitors(); if (list->is_empty()) return; tty->print_cr("\tmonitor list:"); for (int index = (list->length()-1); index >= 0; index--) { MonitorInfo* monitor = list->at(index); tty->print("\t obj\t"); if (monitor->owner_is_scalar_replaced()) { Klass* k = java_lang_Class::as_Klass(monitor->owner_klass()); tty->print("( is scalar replaced %s)", k->external_name()); } else if (monitor->owner() == NULL) { tty->print("( null )"); } else { monitor->owner()->print_value(); tty->print("(owner=" INTPTR_FORMAT ")", (address)monitor->owner()); } if (monitor->eliminated()) { if(is_compiled_frame()) { tty->print(" ( lock is eliminated in compiled frame )"); } else { tty->print(" ( lock is eliminated, frame not compiled )"); } } tty->cr(); tty->print("\t "); monitor->lock()->print_on(tty); tty->cr(); } } void javaVFrame::print_value() const { Method* m = method(); InstanceKlass* k = m->method_holder(); tty->print_cr("frame( sp=" INTPTR_FORMAT ", unextended_sp=" INTPTR_FORMAT ", fp=" INTPTR_FORMAT ", pc=" INTPTR_FORMAT ")", _fr.sp(), _fr.unextended_sp(), _fr.fp(), _fr.pc()); tty->print("%s.%s", k->internal_name(), m->name()->as_C_string()); if (!m->is_native()) { Symbol* source_name = k->source_file_name(); int line_number = m->line_number_from_bci(bci()); if (source_name != NULL && (line_number != -1)) { tty->print("(%s:%d)", source_name->as_C_string(), line_number); } } else { tty->print("(Native Method)"); } // Check frame size and print warning if it looks suspiciously large if (fr().sp() != NULL) { RegisterMap map = *register_map(); uint size = fr().frame_size(&map); #ifdef _LP64 if (size > 8*K) warning("SUSPICIOUSLY LARGE FRAME (%d)", size); #else if (size > 4*K) warning("SUSPICIOUSLY LARGE FRAME (%d)", size); #endif } } bool javaVFrame::structural_compare(javaVFrame* other) { // Check static part if (method() != other->method()) return false; if (bci() != other->bci()) return false; // Check locals StackValueCollection *locs = locals(); StackValueCollection *other_locs = other->locals(); assert(locs->size() == other_locs->size(), "sanity check"); int i; for(i = 0; i < locs->size(); i++) { // it might happen the compiler reports a conflict and // the interpreter reports a bogus int. if ( is_compiled_frame() && locs->at(i)->type() == T_CONFLICT) continue; if (other->is_compiled_frame() && other_locs->at(i)->type() == T_CONFLICT) continue; if (!locs->at(i)->equal(other_locs->at(i))) return false; } // Check expressions StackValueCollection* exprs = expressions(); StackValueCollection* other_exprs = other->expressions(); assert(exprs->size() == other_exprs->size(), "sanity check"); for(i = 0; i < exprs->size(); i++) { if (!exprs->at(i)->equal(other_exprs->at(i))) return false; } return true; } void javaVFrame::print_activation(int index) const { // frame number and method tty->print("%2d - ", index); ((vframe*)this)->print_value(); tty->cr(); if (WizardMode) { ((vframe*)this)->print(); tty->cr(); } } void javaVFrame::verify() const { } void interpretedVFrame::verify() const { } // ------------- externalVFrame -------------- void externalVFrame::print() { _fr.print_value_on(tty,NULL); } void externalVFrame::print_value() const { ((vframe*)this)->print(); } #endif // PRODUCT