By Tan Yang Meng
Software is tough to advance, retain, and reuse. components that give a contribution to this hassle are the inability of modular layout and reliable software documentation. the 1st makes software program adjustments tougher to enforce. the second one makes courses more challenging to appreciate and to take care of.
Formal Specification innovations for Engineering Modular C Programs describes a singular method of selling software modularity. The publication offers a proper specification language that promotes software program modularity by utilizing summary facts forms, even supposing the underlying programming language won't have such aid. This language is established to permit invaluable info to be extracted from a specification, that's then used to accomplish consistency exams among the specification and its implementation.
Formal Specification strategies for Engineering Modular C Programs additionally describes a specification-driven, software program re-engineering technique version for bettering present courses. the purpose of this technique is to make current courses more straightforward to keep up and reuse whereas conserving their crucial functionalities unchanged.
Audience: compatible as a secondary textual content for graduate point classes in software program engineering, and as a reference for researchers and practitioners in industry.
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Extra resources for Formal Specification Techniques for Engineering Modular C Programs
It does not define a new type; it is only a shorthand for associating a constraint with an exposed type. The LSL operator nullTerminated is defined in the cstring trait; nullTerminated(s) is true when the character string s contains a null character. Hence, the specification codifies the c convention of treating character arrays as strings. The cstring type provides a compact way of specifying operations involving C strings. 6, the specification of the date_parse function shows that two of its formal parameters (indate and inputStr) have the cstring type.
For example, each parameter to a macro implementing a specified function must be used exactly once in the body of the macro. This ensures that side-effects on its arguments behave as expected. While the syntax of a C macro definition does not allow the types of macro parameters to be included, LCLint can obtain the necessary information from the specifications of the function being implemented by the macro. Global Variable Checking: LCL requires that each global variable a function accesses be listed in the specification of the function.
Since C function calls pass parameters by value, the formal parameters of a C function denote values. An exception to this rule is C arrays: they can be viewed as pass by reference. As such, LCL models c arrays as objects so that any change to an array is visible outside the function. Since changes to global and spec variables contain values that persist across function invocations, they always denote objects. 1 are used without state decorations whereas count and hidden need state decorations to extract their values from the pre or post state.