This paper reports on an experimental debugger for concurrent programs. Design objectives include a showing of greatest usefulness when dealing with multiprocess interactions, creation of a simplified more approachable interface for programmers, allowance for the systematic organization (and limitation) of debugging information by programmers, reflection of a natural view of concurrency, and portability. The design responds to a perceived need for debugging techniques applicable in systems of concurrent, communicating, asynchronous processes. During debugging sessions, a user is able to dynamically explore interprocess synchronization points, parallel actions and deadlock situations. The programmer interface is based on a transparent window multiplexer providing a set of windows for each concurrent process. The window manager interactively maps interesting windows to programmer-specified viewscreen locations, while relegating temporarily uninteresting windows to the background. In implementing a debugger for concurrent programs, a principal concern is the probe effect, or the possibility that the debugger itself masks synchronization errors in the program being debugged. For the examples explored, the probe effect was not observed to limit the localization of implanted synchronization errors.

A debugger for concurrent programs

Affix grammars are used to describe the instruction set of a target architecture for purposes of compiler code generation A code generator is obtained automatically for a compiler using attributed parsing techniques A compiler built on this model can automatically perform most popular machine-dependent optimizations, including peephole optimizations Code generators based on this model demonstrate retargetability for the VAX1-11, iAPX2-86, Z-80003, PDP4-11, MC-68000, NS32032, FOM, and IBM-370 architectures

Affix grammar driven code generation

A programming style taxonomy

Event-driven debugging for distributed software

Functional programming style is discussed and seven simple semantic style rules, based on program transformation, are enunciated. An automatic style analyser developed from these rules is then presented.

Automatic analysis of functional program style

Debugging techniques originated with low-level programming languages, where the memory dump and interactive word-by-word examination of memory were the primary tools. "High-level" debugging is often no more than low-level techniques adapted to high-level languages. For example, to examine the execution of an operational specification one state at a time by setting breakpoints, is superior to doing the same thing to a machine-language program, but only because the language level has improved; the debugging remains primitive. This paper attempts a radical definition of debugging level, and illustrates it with a technique for ordering the execution of concurrent processes in a way that follows their design structure.Division of a program into a collection of cooperating processes is a means of controlling the complexity of each process. However, in execution the program--development structure is ignored, with the result that the advantages of decomposition are lost. What the designer has divided and conquered, the debugger sees as an overwhelming monolith. The technique proposed here causes the focus of execution to follow the design structure, in a way that does not require detailed user direction.

Debugging "level": step-wise debugging

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Debugging "level": step-wise debugging