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GNU Prolog

GNU Prolog

GNU Prolog

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Book Details:

Pages:238 pages
Size:867 KB
License:Pending review


GNU Prolog is a free Prolog compiler with constraint solving over finite domains developed by Daniel Diaz. For recent information about GNU Prolog please consult the GNU Prolog page.

GNU Prolog is a Prolog compiler based on the Warren Abstract Machine (WAM). It first compiles a Prolog program to a WAM file which is then translated to a low-level machine independent language called mini-assembly specifically designed for GNU Prolog. The resulting file is then translated to the assembly language of the target machine (from which an object is obtained). This allows GNU Prolog to produce a native stand alone executable from a Prolog source (similarly to what does a C compiler from a C program). The main advantage of this compilation scheme is to produce native code and to be fast. Another interesting feature is that executables are small. Indeed, the code of most unused built-in predicates is not included in the executables at link-time.

A lot of work has been devoted to the ISO compatibility. Indeed, GNU Prolog is very close to the ISO standard for Prolog.

GNU Prolog also offers various extensions very useful in practice (global variables, OS interface, sockets,...). In particular, GNU Prolog contains an efficient constraint solver over Finite Domains (FD). This opens constraint logic programming to the user combining the power of constraint programming to the declarativity of logic programming. The key feature of the GNU Prolog solver is the use of a single (lowlevel) primitive to define all (high-level) FD constraints. There are many advantages of this approach: constraints can be compiled, the user can define his own constraints (in terms of the primitive), the solver is open and extensible (as opposed to black-box solvers like CHIP). Moreover, the GNU Prolog solver is rather efficient, often more than commercial solvers.



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