By David R. Hanson

ISBN-10: 0805316701

ISBN-13: 9780805316704

This new textual content examines the layout and implementation of Icc, a production-quality, retargetable compiler, designed at AT&T Bell Laboratories and Princeton college for the ANSI interval. The authors' leading edge procedure - a "literate software" that intermingles the textual content with the resource code - offers 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 concentrate on remoted items of code, the authors have made on hand the total resource code for a true compiler. based as a self-study consultant that describes the real-world tradeoffs encountered in development a production-quality compiler, A Retargetable C Compiler can also be necessary to people who paintings in program parts utilizing or developing 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 concept and perform; covers compiler concept basically as had to comprehend the implementation of Icc, focusing as a substitute on useful, utilized concerns; encourages a deeper realizing 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 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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Extra resources for A Retargetable C Compiler Design and Implementation

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For variables and labels, the ref field is an approximation of the number of times that variable is referenced. 3 explains how this approximation is computed. The u field is a union that supplies additional data for labels, structure and union types, enumeration identifiers, enumeration types, constants, functions, global and static variables, and temporary variables. The (symbol flags) are one-bit attribute flags for each symbol. The x field and the (debugger extension) collect fields that are manipulated only by back ends, such as the register assigned to a variable or the information necessary to generate data for a debugger.

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.

PERM identifies the permanent storage arena. (install new string str 31)= 30 { static char *next, *strlimit; if (next + len + 1 >= strlimit) { int n = len + 4*1024; next= allocate(n, PERM); strlimit = next + n; } NEW(p, PERM); p->len = len; for (p->str = next; str < end; ) *next++ = *str++; *next++ = O; p->link = buckets[h]; buckets[h] = p; return p->str; } The static variable next points to the next free byte in the current chunk, and strlimit points one past the end of the chunk. The code allocates a new chunk, if necessary, and a new table entry.

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

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