A Retargetable C Compiler Design and Implementation by David R. Hanson

By David R. Hanson

This new textual content examines the layout and implementation of Icc, a production-quality, retargetable compiler, designed at AT&T Bell Laboratories and Princeton collage for the ANSI c language. The authors' cutting edge strategy - a "literate application" that intermingles the textual content with the resource code - provides an in depth journey of the code that explains the implementation and layout judgements mirrored within the software program. And whereas such a lot books describe toy compilers or specialise in remoted items of code, the authors have made on hand the full resource code for a true compiler. established as a self-study consultant that describes the real-world tradeoffs encountered in construction a production-quality compiler, A Retargetable C Compiler is additionally worthwhile to people who paintings in software parts utilizing or growing language-based instruments and methods. positive factors: discusses the implementation and layout tradeoffs made whereas developing a true ANSI C compiler, illustrating the interplay among concept and perform; covers compiler conception simply as had to comprehend the implementation of Icc, focusing as a substitute on sensible, utilized matters; encourages a deeper figuring out of programming in C, through supplying C programmers with a travel of the language from the viewpoint of compiler authors; contains insurance of code turbines for the MIPS R3000, SPARC, and Intel 386 and its successors; and gives entry to the entire resource code for the Icc compiler, the 3 again ends, and the code-generator generator, both on disk or through FTP.

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1. c functions)+= .... ,.. 4 Deallocating Space An arena is deallocated by adding its blocks to the free-blocks list and reinitializing it to point to the appropriate one-element list that holds a zero-length block. c functions)+= .... 5 Strings Strings are created for identifiers, constants, registers, and so on. Strings are compared often; for example, when a symbol table is searched for an identifier. The most common uses of strings are provided by the functions exported by string. c exported functions)= extern char* string ARGS((char *str)); extern char *stringn ARGS((char *str, int len)); extern char *stringd ARGS((int n)); Each of these functions returns a pointer to a permanently allocated string.

2 Storage Management Complex programs allocate memory dynamically, and 1cc is no exception. In C, ma11 oc allocates memory and free releases it. lee could use ma11 oc and free, but there is a superior alternative that is more efficient, easier to program, and better suited for use in compilers, and it is easily understood in isolation. Calling ma11 oc incurs the obligation of a subsequent call to free. The cost of this explicit deallocation can be significant. More important, it's easy to forget it or, worse, deallocate something that's still referenced.

The code allocates a new chunk, if necessary, and a new table entry. It copies str, which incidentally allocates space for it as it is copied by incrementing next, and links the new entry into the appropriate hash chain. 5 in Knuth (1973a) is the definitive reference. There is a long list of techniques that 26 allocate 19 NELEMS 24 NEW 97 PERM 30 stringn CHAPTER 2 • STORAGE MANAGEMENT 32 allocate 26 deallocate 28 are designed both for general-purpose use and for specific application areas, including the design described in this chapter (Hanson 1990).

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