A Concurrent Pascal Compiler for Minicomputers by A. C. Hartmann

By A. C. Hartmann

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Extra info for A Concurrent Pascal Compiler for Minicomputers

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Are lon 9 constants. They w i l l integers, reals, Real, s t r i n g , and set constants appear in a separate constants t a b l e . constant e x i s t s , the empty set. The empty set is the f i r s t Only one set e n t r y in the constants table. Named constants are given values or constants t a b l e displacements in name a n a l y s i s , the t h i r d pass. Name analysis replaces short named constants by t h e i r values and long named constants by t h e i r displacements. ibility of name a n a l y s i s .

Routine names appearing in an interface l i s t are not placed on the operand stack. Instead they are added to a chain of names associated with the program declar- ation. This chain is maintained by the same mechanisms used to maintain q u a l i f i c a t i o n lists. Routines referenced in the body are placed on the operand stack. The name of the routine and the name of i t s f i r s t parameter are included in the operand entry. As each argument appears in the input code, the parameter chain is followed to the next parameter.

At each phase o f the t e s t i n g a l l t e s t programs are used, not j u s t the t e s t programs f o r the new pass. a new pass is f i r s t will As each pass This allows a l l t e s t programs to be in source added, a l l t e s t programs w i l l fail. Generally when Several o f these f a i l u r e s p o i n t out d i f f e r e n t bugs, and these may be discovered and corrected simultan- eously. As t e s t i n g progresses, more and more t e s t programs w i l l failure, until finally be compiled w i t h o u t a l l t e s t programs compile s u c c e s s f u l l y .

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