By Seth D. Bergmann
This is often an introductory point textual content for compiler layout classes, that emphasizes challenge fixing abilities. The techniques are truly offered with sampler difficulties and diagrams to demonstrate the recommendations. The textual content additionally covers lex and yacc compiler producing instruments in UNIX.
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Extra info for Compiler design: theory, tools, and examples
N %% printf printf printf printf printf ; (“alpha\n”); (“numeric\n”); (“alphanumeric\n”); (“white space\n”); (“special char\n”); /* /* /* /* /* /* pattern pattern pattern pattern pattern pattern 1 2 3 4 5 6 */ */ */ */ */ */ The above lex source could be used to classify input strings as alphabetic, numeric, alphanumeric, or special, using white space as delimiters. Note that the action executed when a newline character is read is a null statement. Lex declares global variables char * yytext and int yyleng for your use.
As implied by its name, lexical analysis attempts to isolate the “words” in an input string. We use the word “word” in a technical sense. A word, also known as a lexeme, a lexical item, or a lexical token, is a string of input characters which is taken as a unit and passed on to the next phase of compilation. Examples of words are: (1) keywords - while, if, else, for, ... These are words which may have a particular predefined meaning to the compiler, as opposed to identifiers which have no particular meaning.
00+11)*(01+10)(1(0(11)*0)*1+0(1(00)*1)*0)*1(0(11)*0)* + (00+11)*0 An algorithm for converting a finite state machine to an equivalent regular expression is beyond the scope of this text, but may be found in Hopcroft & Ullman . (a) (d) 3. bca aaa (b) (e) accbab aabbcc Which of the following are examples of languages? (a) L1 from Problem 1 above. (c) Pascal (e) Swahili 4. ε (c) (b) L2 from Problem 2 above. (d) The set of all programming languages Which of the following strings are in the language specified by this finite state machine?
Compiler design: theory, tools, and examples by Seth D. Bergmann