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 method - a "literate application" that intermingles the textual content with the resource code - offers a close travel of the code that explains the implementation and layout judgements mirrored within the software program. And whereas so much books describe toy compilers or specialise in remoted items of code, the authors have made to be had 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 beneficial to people who paintings in program components utilizing or growing language-based instruments and strategies. positive aspects: discusses the implementation and layout tradeoffs made whereas developing a true ANSI C compiler, illustrating the interplay among conception and perform; covers compiler thought in basic terms as had to comprehend the implementation of Icc, focusing in its place on functional, utilized concerns; encourages a deeper knowing of programming in C, via supplying C programmers with a travel of the language from the viewpoint of compiler authors; contains assurance of code turbines for the MIPS R3000, SPARC, and Intel 386 and its successors; and offers entry to the whole 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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Additional info for A Retargetable C Compiler Design and Implementation
Explain any differences you find. 13 The size of stringn's hash table is a power of two, which is often deprecated. Try a prime and measure the results. Try to design a better hash function and measure the results. 14 stri ngn compares strings with inline code instead of, for example, calling memcmp. Replace the inline code with a call to memcmp and measure the result. Why was our decision to inline justified? 15 lee makes heavy use of circularly linked lists of pointers, and the implementation of the module 1 i st.
For example, the scope of a:6 is lines 6-8, which is the hole in the scope of a:2, whose scope is lines 2-5 and 9-10. The symbol-management functions must accommodate this and similar situations. In most languages, like Pascal, there is one name space for identifiers. That is, there is a single set of identifiers for all purposes and, at any point in the program, there can be only one visible identifier of a given name. The name spaces in ANSI C categorize identifiers according to use: Statement labels, tags, members, and ordinary identifiers.
25 27 2. 3 • ALLOCATING SPACE 27 long l; char *p; double d; int (*f) ARGS((void)); }; Like malloc, allocate must return a pointer suitably aligned to hold values of any type. The size of the union al i gn gives the minimum such alignment on the host machine. Its fields are those that are most likely to have the strictest alignment requirements. The while loop in the code above terminates when the block pointed to by ap has at least n bytes of available space. For most calls to a 11 ocate, this block is the one pointed to by the arena pointer pointed to by a 11 ocate's second argument.
A Retargetable C Compiler Design and Implementation by David R. Hanson