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By Aaby A.A.

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Expressions are translated as follows: constant LD_INT constant variable LD variable e1 op e2 code for e1 code for e2 code for op 28 The Code Generator Module The data segment begins with an offset of zero and space is reserved, in the data segment, by calling the function data location which returns the address of the reserved location. int data_offset = 0; int data_location() { return data_offset++; } The code segment begins with an offset of zero. Space is reserved, in the code segment, by calling the function reserve loc which returns the address of the reserved location.

Overloading (25 points total) i. Subprogram identifier (18 points) ii. Operators (7 points) Packages (55 points total). i. Combined packages (containing both declaration and body parts); qualified access to visible part (20 points) ii. Split packages (with distinct declaration and body parts) (5 points) iii. Private types (10 points) iv. Separate compilation of package bodies (20 points) Use statements (11 points) Exceptions (including exception declarations, raise statements, exception handlers, predefined exceptions) (20 points).

7 Sample program: test simple let integer n,x. in 57 read n; if n < 10 then x := 1; else skip; fi; while n < 10 do x := 5*x; n := n+1; end; skip; write n; write x; end 58 Appendix B Lex/Flex In order for Lex/Flex to recognize patterns in text, the pattern must be described by a regular expression. The input to Lex/Flex is a machine readable set of regular expressions. The input is in the form of pairs of regular expressions and C code, called rules. c, which defines a routine yylex(). This file is compiled and linked with the -lfl library to produce an executable.

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Compiler construction using Flex and Bison by Aaby A.A.


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