By Mads Tofte
The starting place of this monograph is a direction entitled "Semantics directed Compiler iteration" which Professor Neil D. Jones gave in 1982 at Copenhagen collage, the place i used to be a pupil on the time. during this path, he defined a compiler generator, referred to as CERES, which he was once constructing. I instantly felt drawn to the bizarre blend of mathematical reasoning approximately com pilers and the small tricky construction blocks that made up the working approach. As I got here to appreciate the procedure i found that in the latest mathematical framework one can show compiler iteration as a distinct case of compilation; this resulted in a specification of a compiler generator which used to be bootstrapped on itself leading to a machine-generated compiler generator. the aim of this monograph is to explain the CERES procedure we produced in 1983-84 and evaluate it with different structures, includ ing newer ones. additionally, it really is as appropriate this day because it used to be then to debate the function of compiler turbines as an relief within the layout and implementation of programming languages; this I do in Chap. five. This monograph is a strongly revised model of the cando scient.
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Additional info for Compiler Generators: What They Can Do, What They Might Do, and What They Will Probably Never Do
From this point of view, a language definition describes a tree-to-tree transformation mapping source program trees to trees in S which (by definition) are equivalent to the source trees. 1) The other possibility is to view the rules as describing how Ld-terms are to be executed. In order to execute a definition we would then need an interpretation for LOOP so that we could actually execute read, mul, and all the other elementary actions. From this point of view a definition takes two inputs: a source program and its input.
This implication can be proved in a mathematical sense, assuming suitable definitions of the concepts involved. We shan do this in Chap. 3. 3 Compilers Written as Object Programs A "compiling definition" can be translated into an object program in a fairly straightforward way; all we really need to "execute" a compiling definition is elementary actions to handle the recursive calls and the comparison between the actual node of the syntax tree and the left-hand sides of the rules. As an example, Fig.
In order to execute a definition we would then need an interpretation for LOOP so that we could actually execute read, mul, and all the other elementary actions. From this point of view a definition takes two inputs: a source program and its input. ) Notice that D and DS have the same syntax (both languages have language definitions as programs) but different semantics. I hope, however, that the reader will agree that a language definition does not look like a compiler from the defined language to a language of linear code.