179,106 research outputs found
Generating analyzers with PAG
To produce high qualitiy code, modern compilers use global optimization algorithms based on it abstract interpretation. These algorithms are rather complex; their implementation is therfore a non-trivial task and error-prone. However, since thez are based on a common theory, they have large similar parts. We conclude that analyzer writing better should be replaced with analyzer generation. We present the tool sf PAG that has a high level functional input language to specify data flow analyses. It offers th specifications of even recursive data structures and is therfore not limited to bit vector problems. sf PAG generates efficient analyzers wich can be easily integrated in existing compilers. The analyzers are interprocedural, they can handle recursive procedures with local variables and higher order functions. sf PAG has successfully been tested by generating several analyzers (e.g. alias analysis, constant propagation, inerval analysis) for an industrial quality ANSI-C and Fortran90 compiler. This technical report consits of two parts; the first introduces the generation system and the second evaluates generated analyzers with respect to their space and time consumption. bf Keywords: data flow analysis, specification and generation of analyzers, lattice specification, abstract syntax specification, interprocedural analysis, compiler construction
Generation of file processing programs based on JSP
This paper describes the generation of file processing programmes within the TUBA environment. Program structures are derived from data structures according to the JSP method. Expressions describing output data are specified in user-system dialogues. The program specifications are stored in the dictionary. Complete executable programs can be generated from these specifications
E-BioFlow: Different Perspectives on Scientific Workflows
We introduce a new type of workflow design system called\ud
e-BioFlow and illustrate it by means of a simple sequence alignment workflow. E-BioFlow, intended to model advanced scientific workflows, enables the user to model a workflow from three different but strongly coupled perspectives: the control flow perspective, the data flow perspective, and the resource perspective. All three perspectives are of\ud
equal importance, but workflow designers from different domains prefer different perspectives as entry points for their design, and a single workflow designer may prefer different perspectives in different stages of workflow design. Each perspective provides its own type of information, visualisation and support for validation. Combining these three perspectives in a single application provides a new and flexible way of modelling workflows
Generating analyzers with PAG
To produce high qualitiy code, modern compilers use global optimization algorithms based on it abstract interpretation. These algorithms are rather complex; their implementation is therfore a non-trivial task and error-prone. However, since thez are based on a common theory, they have large similar parts. We conclude that analyzer writing better should be replaced with analyzer generation. We present the tool sf PAG that has a high level functional input language to specify data flow analyses. It offers th specifications of even recursive data structures and is therfore not limited to bit vector problems. sf PAG generates efficient analyzers wich can be easily integrated in existing compilers. The analyzers are interprocedural, they can handle recursive procedures with local variables and higher order functions. sf PAG has successfully been tested by generating several analyzers (e.g. alias analysis, constant propagation, inerval analysis) for an industrial quality ANSI-C and Fortran90 compiler. This technical report consits of two parts; the first introduces the generation system and the second evaluates generated analyzers with respect to their space and time consumption. bf Keywords: data flow analysis, specification and generation of analyzers, lattice specification, abstract syntax specification, interprocedural analysis, compiler construction
Automatic Test Generation for Space
The European Space Agency (ESA) uses an engine to perform tests in the Ground
Segment infrastructure, specially the Operational Simulator. This engine uses
many different tools to ensure the development of regression testing
infrastructure and these tests perform black-box testing to the C++ simulator
implementation. VST (VisionSpace Technologies) is one of the companies that
provides these services to ESA and they need a tool to infer automatically
tests from the existing C++ code, instead of writing manually scripts to
perform tests. With this motivation in mind, this paper explores automatic
testing approaches and tools in order to propose a system that satisfies VST
needs
High-speed, in-band performance measurement instrumentation for next generation IP networks
Facilitating always-on instrumentation of Internet traffic for the purposes of performance measurement is crucial in order to enable accountability of resource usage and automated network control, management and optimisation. This has proven infeasible to date due to the lack of native measurement mechanisms that can form an integral part of the networkâs main forwarding operation. However, Internet Protocol version 6 (IPv6) specification enables the efficient encoding and processing of optional per-packet information as a native part of the network layer, and this constitutes a strong reason for IPv6 to be adopted as the ubiquitous next generation Internet transport.
In this paper we present a very high-speed hardware implementation of in-line measurement, a truly native traffic instrumentation mechanism for the next generation Internet, which facilitates performance measurement of the actual data-carrying traffic at small timescales between two points in the network. This system is designed to operate as part of the routers' fast path and to incur an absolutely minimal impact on the network operation even while instrumenting traffic between the edges of very high capacity links. Our results show that the implementation can be easily accommodated by current FPGA technology, and real Internet traffic traces verify that the overhead incurred by instrumenting every packet over a 10 Gb/s operational backbone link carrying a typical workload is indeed negligible
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Silicon compilation
Silicon compilation is a term used for many different purposes. In this paper we define silicon compilation as a mapping from some higher level description into layout. We define the basic issues in structural and behavioral silicon compilation and some possible solutions to those issues. Finally, we define the concept of an intelligent silicon compiler in which the compiler evaluates the quality of the generated design and attempts to improve it if it is not satisfactory
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