By Darius Blasband (auth.), Ralf Lämmel, João Saraiva, Joost Visser (eds.)
This instructional quantity comprises revised and prolonged lecture notes of six lengthy tutorials, 5 brief tutorials, and one peer-reviewed player contribution held on the 4th overseas summer season college on Generative and Transformational recommendations in software program Engineering, GTTSE 2011. the varsity provides the cutting-edge in software program language engineering and generative and transformational thoughts in software program engineering with assurance of foundations, tools, instruments, and case studies.
Read or Download Generative and Transformational Techniques in Software Engineering IV: International Summer School, GTTSE 2011, Braga, Portugal, July 3-9, 2011. Revised Papers PDF
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Additional resources for Generative and Transformational Techniques in Software Engineering IV: International Summer School, GTTSE 2011, Braga, Portugal, July 3-9, 2011. Revised Papers
Example text
Fig. 21. CoCoLab PL/I parser’s definition of an identifier CoCoLab’s PL/I parser is generated using Lark[41], which can generate a parser and a strongly typed parse tree in a number of languages, including C[30], Modula II[75], Eiffel[58] and Ada[23]. It uses a grammar rule as depicted in figure 21 to deal with lexical ambiguity as presented in the sample in figure 5. It thus allows any of the language’s keywords to be used whenever an identifier is required. The parser then relies on Lark-generated parsers’ ability to backtrack to consider alternate interpretation of the input if needed.
The PL/I STRING builtin function These constructions produce what we’ll refer to as a descriptor (the wording is vague on purpose, as the descriptor can be very different things depending on the language at hand. It can be a pointer – or lvalue – in C, a pointer and a Compilation of Legacy Languages in the 21st Century 27 length in COBOL, a pointer, a length and a bit offset in PL/I, and could very well even contain a type information in some languages, where the target type to use for the assignment can change dynamically as part of the evaluation of the left component).
These builtins are supported by our compiler, mimicking the returned data types as announced in the mainframe PL/I compiler. The compiler even provides a command-line option that allows one to set the precision of some of these builtins, emulating a similar option available for the mainframe compiler. It soon appeared that a number of tests that display values returned by builtins produced different output depending on whether our compiler or the Compilation of Legacy Languages in the 21st Century 41 original mainframe compiler is being used.