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 procedure - a "literate application" that intermingles the textual content with the resource code - provides an in depth travel 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 total resource code for a true compiler. established as a self-study consultant that describes the real-world tradeoffs encountered in development a production-quality compiler, A Retargetable C Compiler can be worthy to people who paintings in program components utilizing or growing language-based instruments and methods. positive aspects: discusses the implementation and layout tradeoffs made whereas developing a true ANSI C compiler, illustrating the interplay among idea and perform; covers compiler conception merely as had to comprehend the implementation of Icc, focusing as a substitute on sensible, utilized concerns; encourages a deeper figuring out of programming in C, through offering C programmers with a journey of the language from the viewpoint of compiler authors; comprises insurance of code turbines for the MIPS R3000, SPARC, and Intel 386 and its successors; and offers entry to the total 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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It takes a conservative approach: Anything that looks like a pointer is taken to be one. As a result, the collector identifies some inaccessible memory as accessible and thus busy, but that's better than making the opposite decision. Storing all strings in a string table and using hashing to keep only one copy of any string is a scheme that's been used for years in compilers and related programming-language implementations, but it's rarely documented. It's used in SNOBOL4 (Griswold 1972), for example, to make comparison fast and to make it easy to use strings as keys in associative tables.

Also, the search key is a field in the union u that is specific to labels or constants. Compiler-generated labels and the internal counterparts of sourcelanguage labels are named by integers. c functions)+= int genlabel(n) int n; { static int label = 1; label += n; return label - n; } ... 45 46 ..... 40 HASHSIZE 44 install 39 Table CHAPTER 3 • SYMBOL MANAGEMENT 46 gen 1abe 1 is also used whenever a unique, anonymous name is needed, such as for generated identifiers like temporaries. A symbol is allocated for each label, and u .

Locus appends tp->all and cp to symbols and 1oci. tp->a 11 points to the symbol most recently added to the table *tp, and is thus the current tail of the list of visible symbols. Implement use and 1ocus; both take fewer than five lines. Coordinate List Symbol Table use 38 34 37 39 51 4 Types Types abound in C programs. These include the types given explicitly in declarations and those derived as intermediate types in expressions. For example, the assignment in int *p, x; *p = x; involves three different types.

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