diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/utilities/exceptions.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/utilities/exceptions.cpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,514 @@ +/* + * Copyright (c) 1998, 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 "classfile/vmSymbols.hpp" +#include "compiler/compileBroker.hpp" +#include "logging/log.hpp" +#include "logging/logStream.hpp" +#include "memory/resourceArea.hpp" +#include "oops/oop.inline.hpp" +#include "runtime/init.hpp" +#include "runtime/java.hpp" +#include "runtime/javaCalls.hpp" +#include "runtime/thread.inline.hpp" +#include "runtime/threadCritical.hpp" +#include "utilities/events.hpp" +#include "utilities/exceptions.hpp" + +// Implementation of ThreadShadow +void check_ThreadShadow() { + const ByteSize offset1 = byte_offset_of(ThreadShadow, _pending_exception); + const ByteSize offset2 = Thread::pending_exception_offset(); + if (offset1 != offset2) fatal("ThreadShadow::_pending_exception is not positioned correctly"); +} + + +void ThreadShadow::set_pending_exception(oop exception, const char* file, int line) { + assert(exception != NULL && oopDesc::is_oop(exception), "invalid exception oop"); + _pending_exception = exception; + _exception_file = file; + _exception_line = line; +} + +void ThreadShadow::clear_pending_exception() { + LogTarget(Debug, exceptions) lt; + if (_pending_exception != NULL && lt.is_enabled()) { + ResourceMark rm; + LogStream ls(lt); + ls.print("Thread::clear_pending_exception: cleared exception:"); + _pending_exception->print_on(&ls); + } + _pending_exception = NULL; + _exception_file = NULL; + _exception_line = 0; +} +// Implementation of Exceptions + +bool Exceptions::special_exception(Thread* thread, const char* file, int line, Handle h_exception) { + // bootstrapping check + if (!Universe::is_fully_initialized()) { + vm_exit_during_initialization(h_exception); + ShouldNotReachHere(); + } + +#ifdef ASSERT + // Check for trying to throw stack overflow before initialization is complete + // to prevent infinite recursion trying to initialize stack overflow without + // adequate stack space. + // This can happen with stress testing a large value of StackShadowPages + if (h_exception()->klass() == SystemDictionary::StackOverflowError_klass()) { + InstanceKlass* ik = InstanceKlass::cast(h_exception->klass()); + assert(ik->is_initialized(), + "need to increase java_thread_min_stack_allowed calculation"); + } +#endif // ASSERT + + if (thread->is_VM_thread() + || !thread->can_call_java()) { + // We do not care what kind of exception we get for the vm-thread or a thread which + // is compiling. We just install a dummy exception object + thread->set_pending_exception(Universe::vm_exception(), file, line); + return true; + } + + return false; +} + +bool Exceptions::special_exception(Thread* thread, const char* file, int line, Symbol* h_name, const char* message) { + // bootstrapping check + if (!Universe::is_fully_initialized()) { + if (h_name == NULL) { + // atleast an informative message. + vm_exit_during_initialization("Exception", message); + } else { + vm_exit_during_initialization(h_name, message); + } + ShouldNotReachHere(); + } + + if (thread->is_VM_thread() + || !thread->can_call_java()) { + // We do not care what kind of exception we get for the vm-thread or a thread which + // is compiling. We just install a dummy exception object + thread->set_pending_exception(Universe::vm_exception(), file, line); + return true; + } + return false; +} + +// This method should only be called from generated code, +// therefore the exception oop should be in the oopmap. +void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) { + assert(exception != NULL, "exception should not be NULL"); + Handle h_exception(thread, exception); + _throw(thread, file, line, h_exception); +} + +void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception, const char* message) { + ResourceMark rm; + assert(h_exception() != NULL, "exception should not be NULL"); + + // tracing (do this up front - so it works during boot strapping) + log_info(exceptions)("Exception <%s%s%s> (" INTPTR_FORMAT ") \n" + "thrown [%s, line %d]\nfor thread " INTPTR_FORMAT, + h_exception->print_value_string(), + message ? ": " : "", message ? message : "", + p2i(h_exception()), file, line, p2i(thread)); + // for AbortVMOnException flag + Exceptions::debug_check_abort(h_exception, message); + + // Check for special boot-strapping/vm-thread handling + if (special_exception(thread, file, line, h_exception)) { + return; + } + + if (h_exception->is_a(SystemDictionary::OutOfMemoryError_klass())) { + count_out_of_memory_exceptions(h_exception); + } + + assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable"); + + // set the pending exception + thread->set_pending_exception(h_exception(), file, line); + + // vm log + if (LogEvents){ + Events::log_exception(thread, "Exception <%s%s%s> (" INTPTR_FORMAT ") thrown at [%s, line %d]", + h_exception->print_value_string(), message ? ": " : "", message ? message : "", + p2i(h_exception()), file, line); + } +} + + +void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message, + Handle h_loader, Handle h_protection_domain) { + // Check for special boot-strapping/vm-thread handling + if (special_exception(thread, file, line, name, message)) return; + // Create and throw exception + Handle h_cause(thread, NULL); + Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); + _throw(thread, file, line, h_exception, message); +} + +void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause, + Handle h_loader, Handle h_protection_domain) { + // Check for special boot-strapping/vm-thread handling + if (special_exception(thread, file, line, name, message)) return; + // Create and throw exception and init cause + Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); + _throw(thread, file, line, h_exception, message); +} + +void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause, + Handle h_loader, Handle h_protection_domain) { + // Check for special boot-strapping/vm-thread handling + if (special_exception(thread, file, line, h_cause)) return; + // Create and throw exception + Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain); + _throw(thread, file, line, h_exception, NULL); +} + +void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) { + // Check for special boot-strapping/vm-thread handling + if (special_exception(thread, file, line, name, NULL)) return; + // Create and throw exception + Handle h_loader(thread, NULL); + Handle h_prot(thread, NULL); + Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot); + _throw(thread, file, line, exception); +} + + +// Methods for default parameters. +// NOTE: These must be here (and not in the header file) because of include circularities. +void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) { + _throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL)); +} +void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) { + _throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL)); +} +void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) { + _throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL)); +} + + +void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, const methodHandle& method) { + Handle exception; + if (!THREAD->has_pending_exception()) { + Klass* k = SystemDictionary::StackOverflowError_klass(); + oop e = InstanceKlass::cast(k)->allocate_instance(CHECK); + exception = Handle(THREAD, e); // fill_in_stack trace does gc + assert(InstanceKlass::cast(k)->is_initialized(), "need to increase java_thread_min_stack_allowed calculation"); + if (StackTraceInThrowable) { + java_lang_Throwable::fill_in_stack_trace(exception, method()); + } + // Increment counter for hs_err file reporting + Atomic::inc(&Exceptions::_stack_overflow_errors); + } else { + // if prior exception, throw that one instead + exception = Handle(THREAD, THREAD->pending_exception()); + } + _throw(THREAD, file, line, exception); +} + +void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) { + const int max_msg_size = 1024; + va_list ap; + va_start(ap, format); + char msg[max_msg_size]; + vsnprintf(msg, max_msg_size, format, ap); + msg[max_msg_size-1] = '\0'; + va_end(ap); + _throw_msg(thread, file, line, h_name, msg); +} + + +// Creates an exception oop, calls the method with the given signature. +// and returns a Handle +Handle Exceptions::new_exception(Thread *thread, Symbol* name, + Symbol* signature, JavaCallArguments *args, + Handle h_loader, Handle h_protection_domain) { + assert(Universe::is_fully_initialized(), + "cannot be called during initialization"); + assert(thread->is_Java_thread(), "can only be called by a Java thread"); + assert(!thread->has_pending_exception(), "already has exception"); + + Handle h_exception; + + // Resolve exception klass + InstanceKlass* klass = InstanceKlass::cast(SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread)); + + if (!thread->has_pending_exception()) { + assert(klass != NULL, "klass must exist"); + // We are about to create an instance - so make sure that klass is initialized + klass->initialize(thread); + if (!thread->has_pending_exception()) { + // Allocate new exception + h_exception = klass->allocate_instance_handle(thread); + if (!thread->has_pending_exception()) { + JavaValue result(T_VOID); + args->set_receiver(h_exception); + // Call constructor + JavaCalls::call_special(&result, klass, + vmSymbols::object_initializer_name(), + signature, + args, + thread); + } + } + } + + // Check if another exception was thrown in the process, if so rethrow that one + if (thread->has_pending_exception()) { + h_exception = Handle(thread, thread->pending_exception()); + thread->clear_pending_exception(); + } + return h_exception; +} + +// Creates an exception oop, calls the method with the given signature. +// and returns a Handle +// Initializes the cause if cause non-null +Handle Exceptions::new_exception(Thread *thread, Symbol* name, + Symbol* signature, JavaCallArguments *args, + Handle h_cause, + Handle h_loader, Handle h_protection_domain) { + Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain); + + // Future: object initializer should take a cause argument + if (h_cause.not_null()) { + assert(h_cause->is_a(SystemDictionary::Throwable_klass()), + "exception cause is not a subclass of java/lang/Throwable"); + JavaValue result1(T_OBJECT); + JavaCallArguments args1; + args1.set_receiver(h_exception); + args1.push_oop(h_cause); + JavaCalls::call_virtual(&result1, h_exception->klass(), + vmSymbols::initCause_name(), + vmSymbols::throwable_throwable_signature(), + &args1, + thread); + } + + // Check if another exception was thrown in the process, if so rethrow that one + if (thread->has_pending_exception()) { + h_exception = Handle(thread, thread->pending_exception()); + thread->clear_pending_exception(); + } + return h_exception; +} + +// Convenience method. Calls either the () or (Throwable) method when +// creating a new exception +Handle Exceptions::new_exception(Thread* thread, Symbol* name, + Handle h_cause, + Handle h_loader, Handle h_protection_domain, + ExceptionMsgToUtf8Mode to_utf8_safe) { + JavaCallArguments args; + Symbol* signature = NULL; + if (h_cause.is_null()) { + signature = vmSymbols::void_method_signature(); + } else { + signature = vmSymbols::throwable_void_signature(); + args.push_oop(h_cause); + } + return new_exception(thread, name, signature, &args, h_loader, h_protection_domain); +} + +// Convenience method. Calls either the () or (String) method when +// creating a new exception +Handle Exceptions::new_exception(Thread* thread, Symbol* name, + const char* message, Handle h_cause, + Handle h_loader, Handle h_protection_domain, + ExceptionMsgToUtf8Mode to_utf8_safe) { + JavaCallArguments args; + Symbol* signature = NULL; + if (message == NULL) { + signature = vmSymbols::void_method_signature(); + } else { + // We want to allocate storage, but we can't do that if there's + // a pending exception, so we preserve any pending exception + // around the allocation. + // If we get an exception from the allocation, prefer that to + // the exception we are trying to build, or the pending exception. + // This is sort of like what PRESERVE_EXCEPTION_MARK does, except + // for the preferencing and the early returns. + Handle incoming_exception(thread, NULL); + if (thread->has_pending_exception()) { + incoming_exception = Handle(thread, thread->pending_exception()); + thread->clear_pending_exception(); + } + Handle msg; + if (to_utf8_safe == safe_to_utf8) { + // Make a java UTF8 string. + msg = java_lang_String::create_from_str(message, thread); + } else { + // Make a java string keeping the encoding scheme of the original string. + msg = java_lang_String::create_from_platform_dependent_str(message, thread); + } + if (thread->has_pending_exception()) { + Handle exception(thread, thread->pending_exception()); + thread->clear_pending_exception(); + return exception; + } + if (incoming_exception.not_null()) { + return incoming_exception; + } + args.push_oop(msg); + signature = vmSymbols::string_void_signature(); + } + return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain); +} + +// Another convenience method that creates handles for null class loaders and +// protection domains and null causes. +// If the last parameter 'to_utf8_mode' is safe_to_utf8, +// it means we can safely ignore the encoding scheme of the message string and +// convert it directly to a java UTF8 string. Otherwise, we need to take the +// encoding scheme of the string into account. One thing we should do at some +// point is to push this flag down to class java_lang_String since other +// classes may need similar functionalities. +Handle Exceptions::new_exception(Thread* thread, Symbol* name, + const char* message, + ExceptionMsgToUtf8Mode to_utf8_safe) { + + Handle h_loader(thread, NULL); + Handle h_prot(thread, NULL); + Handle h_cause(thread, NULL); + return Exceptions::new_exception(thread, name, message, h_cause, h_loader, + h_prot, to_utf8_safe); +} + + +// Exception counting for hs_err file +volatile int Exceptions::_stack_overflow_errors = 0; +volatile int Exceptions::_out_of_memory_error_java_heap_errors = 0; +volatile int Exceptions::_out_of_memory_error_metaspace_errors = 0; +volatile int Exceptions::_out_of_memory_error_class_metaspace_errors = 0; + +void Exceptions::count_out_of_memory_exceptions(Handle exception) { + if (exception() == Universe::out_of_memory_error_metaspace()) { + Atomic::inc(&_out_of_memory_error_metaspace_errors); + } else if (exception() == Universe::out_of_memory_error_class_metaspace()) { + Atomic::inc(&_out_of_memory_error_class_metaspace_errors); + } else { + // everything else reported as java heap OOM + Atomic::inc(&_out_of_memory_error_java_heap_errors); + } +} + +void print_oom_count(outputStream* st, const char *err, int count) { + if (count > 0) { + st->print_cr("OutOfMemoryError %s=%d", err, count); + } +} + +bool Exceptions::has_exception_counts() { + return (_stack_overflow_errors + _out_of_memory_error_java_heap_errors + + _out_of_memory_error_metaspace_errors + _out_of_memory_error_class_metaspace_errors) > 0; +} + +void Exceptions::print_exception_counts_on_error(outputStream* st) { + print_oom_count(st, "java_heap_errors", _out_of_memory_error_java_heap_errors); + print_oom_count(st, "metaspace_errors", _out_of_memory_error_metaspace_errors); + print_oom_count(st, "class_metaspace_errors", _out_of_memory_error_class_metaspace_errors); + if (_stack_overflow_errors > 0) { + st->print_cr("StackOverflowErrors=%d", _stack_overflow_errors); + } +} + +// Implementation of ExceptionMark + +ExceptionMark::ExceptionMark(Thread*& thread) { + thread = Thread::current(); + _thread = thread; + if (_thread->has_pending_exception()) { + oop exception = _thread->pending_exception(); + _thread->clear_pending_exception(); // Needed to avoid infinite recursion + exception->print(); + fatal("ExceptionMark constructor expects no pending exceptions"); + } +} + + +ExceptionMark::~ExceptionMark() { + if (_thread->has_pending_exception()) { + Handle exception(_thread, _thread->pending_exception()); + _thread->clear_pending_exception(); // Needed to avoid infinite recursion + if (is_init_completed()) { + exception->print(); + fatal("ExceptionMark destructor expects no pending exceptions"); + } else { + vm_exit_during_initialization(exception); + } + } +} + +// ---------------------------------------------------------------------------------------- + +// caller frees value_string if necessary +void Exceptions::debug_check_abort(const char *value_string, const char* message) { + if (AbortVMOnException != NULL && value_string != NULL && + strstr(value_string, AbortVMOnException)) { + if (AbortVMOnExceptionMessage == NULL || (message != NULL && + strstr(message, AbortVMOnExceptionMessage))) { + fatal("Saw %s, aborting", value_string); + } + } +} + +void Exceptions::debug_check_abort(Handle exception, const char* message) { + if (AbortVMOnException != NULL) { + debug_check_abort_helper(exception, message); + } +} + +void Exceptions::debug_check_abort_helper(Handle exception, const char* message) { + ResourceMark rm; + if (message == NULL && exception->is_a(SystemDictionary::Throwable_klass())) { + oop msg = java_lang_Throwable::message(exception()); + if (msg != NULL) { + message = java_lang_String::as_utf8_string(msg); + } + } + debug_check_abort(exception()->klass()->external_name(), message); +} + +// for logging exceptions +void Exceptions::log_exception(Handle exception, stringStream tempst) { + ResourceMark rm; + Symbol* message = java_lang_Throwable::detail_message(exception()); + if (message != NULL) { + log_info(exceptions)("Exception <%s: %s>\n thrown in %s", + exception->print_value_string(), + message->as_C_string(), + tempst.as_string()); + } else { + log_info(exceptions)("Exception <%s>\n thrown in %s", + exception->print_value_string(), + tempst.as_string()); + } +}