基于虚拟机日志记录回放的可逆调试方法

传统的调试器调试程序时,仅仅能够让程序正向运行并获取其当前的状态.提出了一种可以让程序逆向运行,回到过去任意时刻的调试方法,来增强调试器的功能.该方法是通过为Xen虚拟机添加完整的日志记录和回放功能以及对GDB调试器作相应修改来实现的;调试对象可以恢复到其运行过程的任意时刻.该可逆调试器,可以解决大型软件和操作系统内核...     

Distributed debugging for mobile networks

Debuggers are an integral part, albeit often neglected, of the development of distributed applications. Ambient-oriented programming (AmOP) is a distributed paradigm for applications running on mobile ad hoc networks. In AmOP the complexity of programming in a distributed setting is married with the network fragility and open topology of mobile applications. To our knowledge, there is no debugging approach that tackles both these issues. In this paper we argue that a novel kind of distributed debugger that we term an ambient-oriented debugger, is required. We present REME-D (read as remedy), an online ambient-oriented debugger that integrates techniques from distributed debugging (event-based debugging, message breakpoints) and proposes facilities to deal with ad hoc, fragile networks – epidemic debugging, and support for frequent disconnections.     

Dynamic Query-Based Debugging of Object-Oriented Programs

Program errors are hard to find because of the cause-effect gap between the instant when an error occurs and when the error becomes apparent to the programmer. Although debugging techniques such as conditional and data breakpoints help in finding errors in simple cases, they fail to effectively bridge the cause-effect gap in many situations. This paper proposes two debuggers that provide programmers with an instant error alert by continuously checking inter-object relationships while the debugged program is running. We call such tool a dynamic query-based debugger. To speed up dynamic query evaluation, our debugger implemented in portable Java uses a combination of program instrumentation, load-time code generation, query optimization, and incremental reevaluation. Experiments and a query cost model show that selection queries are efficient in most cases, while more costly join queries are practical when query evaluations are infrequent or query domains are small. To enable query-based debugging in the middle of program execution in a portable way, our debugger performs efficient Java class file instrumentation. We call such debugger an on-the-fly debugger. Though the on-the-fly debugger has a higher overhead than a dynamic query-based debugger, it offers additional interactive power and flexibility while maintaining complete portability.     

远程调试的设计与实现

一般情况下,调试器与被调试程序（目标程序）运行在同一个计算机系统环境中,但是,在实时系统、内核调试及一些Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ系统等情况下,调试器不能运行在目标程序运行的环境中,此时有效的解决方法就是实施远程调试（Ｒｅｍｏｔｅ ｄｅｂｕｇｇｉｎｇ）。远程调试系统由本地调试器、远程调试服务器以及远程调试通讯协议组成。该文详细讨论这三部分的设计与实现,并介绍一个自行设计的基于远程调试的并行调试器。     

支持多种并行程序设计模式的可移植并行调试器设计与实现

MPDG是为高性能并行巨型机系统设计的调试工具,其设计指导思想是：1．采用Client/Server结构,实现系统的可移植性,具体表现为将用户界面,并行调试管理与调试监控服务分离,调试监控采用目标系统支持的调试器;2．以同一的使用方式支持多种并行程序设计模式应用,针对共享内存的并行目标应用（如OpenMP程序)和基．于水息传递的分布式目标应用（如PVM或MPI程序）,提供风格完全一致的调试手段;3．实现图形用户界面,MPDG的GUI分为3级,即主界面,进程集,单个进程,进程集控制特别适合具有相同执行流和用户视图的并行进程的调试。     

A debugger for a graphical workstation

This paper describes the ups source-level debugger. Ups, which is designed to take advantage of the graphics and mouse available on a workstation, displays the debugged program's current state in the form of a hierarchically structured document in which items of interest can be expanded to show more detail. User interaction is via a system of menus and editable subfields, the intention being to create a debugger which has a lot of functionality but is easy to learn and easy to remember. The paper describes the ups user interface itself and discusses its implementaion, which may be of interest to anyone writing a program with an interface based on menus and editable fields. There is also a discussion of some of the problems that will be encountered by anyone trying to write a new debugger to run in an existing environment.     

HPDV1：高性能并行调试器标准

缺乏调度器标准是难以评估一个调试器优劣的重要原因,本文介绍了旨在解决问题的第一个调度标准－－高性能调试论坛（ＨＰＤＦ）制定的高性能调试器标准版本１（ＨＰＤＶ１）。重点阐述了并行调试概念和调试器的并行行为。     

嵌入式系统软件开发环境中调试器的设计

调试在软件开发流程中是一个比较重要的环节,调试器是衡量一个软件开发环境优劣的重要因素.本文对嵌入式系统软件开发环境、软件调试、调试器设计所遵循的基本原理以及嵌入式系统中软件调试的特点作了一个概述.     

Guard: A Relative Debugger

A significant amount of software development is evolutionary, involving the modification of already existing programs. To a large extent, the modified programs produce the same results as the original program. This similarity between the original program and the development program is utilized by relative debugging. Relative debugging is a new concept that enables the user to compare the execution of two programs by specifying the expected correspondences between their states. A relative debugger concurrently executes the programs, verifies the correspondences, and reports any differences found. We describe our novel debugger, called Guard, and its relative debugging capabilities. Guard is implemented by using our library of debugging routines, called Dynascope, which provides debugging primitives in heterogeneous networked environments. To demonstrate the capacity of Guard for debugging in heterogeneous environments, we describe an experiment in which the execution of two programs is compared across Internet. The programs are written in different programming languages and executing on different computing platforms. © 1997 by John Wiley & Sons, Ltd.     

GDBSERVER原理分析及其应用

GDBSERVER是一个轻量级的运行于目标机上的调试器,在嵌入式Linux系统开发中发挥着重要作用。从源代码层分析了GDBSERVER的实现原理,并介绍了在嵌入式Linux系统开发中使用GDBSERVER进行远程调试的方法。     

一种基于Xscale的嵌入式交叉调试系统(器)的设计

介绍了JTAG交叉调试技术及Xscale芯片,并在此基础上给出一种嵌入式交叉调试软件系统的设计.主机端环境为WINDOWS操作系统,并利用ADW调试软件,目标系统采用Xscale芯片.该系统的特点是纯软件实现,廉价方便.     

一个实用的Ada源级调试器的设计和实现

Ada是美国国家军用标准编程语言。近年来,我国也开展了对Ada及其开发环境的研究工作。本文首先介绍高级语言开发环境中源级符号调试器的基本原理,然后给出了一个实用性的Ada源级调试器的设计和实现关键技术。     

Dynamic Reverse Code Generation for Backward Execution

The need for backward execution in debuggers has been raised a number of times. Backward execution helps a user naturally think backwards and, in turn, easily locate the cause of a bug. Backward execution has been implemented mostly by state-saving or checkpointing, which are inherently not scalable. In this paper, we present a method to generate reverse code, so that backtracking can be performed by executing reverse code. The novelty of our work is that we generate reverse code on-the-fly, while running a debugger, which makes it possible to apply the method even to debugging multi-threaded programs.     

Dbxtool: A window-based symbolic debugger for sun workstations

Dbxtool is a window- and mouse-based debugger for C, Pascal and FORTRAN programs running on Sun workstations. Its use of the mouse as the primary input mechanism eliminates the need to type variables, line numbers, breakpoints and most commands. Its multiple windows provide several qualitatively different perspectives on the debugging problem. Compared to the Unix 4.2 BSD dbx from which it is derived, it has been extended with the abilities to debug multiple-process programs, already-running processes, and the Sun Operating System kernel.     

可配置多核处理器的调试器模块化分层设计

针对可配置处理器特点提出一个基于模块化分层设计的调试器架构。该调试器架构具有较好的可复用性和可扩展性,易于移植到其他处理器。本文提出与具体目标机解耦的调试器设计方法,采用具有统一服务接口的目标调试层与具体目标机交互,使用XML格式文件存储目标机信息,通过目标机信息查询模块获取目标机信息。经工程实践表明,本调试器对可配置处理器支持良好。     

基于JTAG技术的嵌入式交叉调试软件

介绍了JTAG交叉调试技术及Xscale芯片的增强调试功能，并在此基础上给出一种嵌入式交叉调试软件系统的设计及实现。主机端环境为LINUX操作系统，并利用GDB调试软件，目标系统采用Xscale芯片。该系统的特点是纯软件实现，廉价方便。     

一种面向集成开发环境的可扩展并行调试器的设计和实现

并行调试器对于提高并行程序的开发效率至关重要。本文通过对主流并行调试器功能、界面、集成度等方面的分析,提出了一种面向集成开发环境、模块化的可扩展并行调试器模型,并从提高调试效率角度着重讨论了其动态分组通信结构和消息合并机制。     

一种DWARF格式C语言调试信息分析方法

DWARF格式是一种常见的调试信息格式,它以节点作为存储调试信息的基本单元。BWDSP系列芯片的调试系统使用一种自主可控的算法分析C语言的DWARF调试信息。该方法首先读取.debug_abbrev节区,获得节点的缩略信息。然后读取.debug_info节区,获取调试信息节点属性的取值,并把这些调试信息存储为内部数据结构。该算法已经在BWDSP系列芯片的调试系统中得到成功的使用,实践验证了其可行性与正确性。