Download GAG: A Practical Compiler Generator by Uwe Kastens, Brigitte Hutt, Erich Zimmermann (auth.) PDF

By Uwe Kastens, Brigitte Hutt, Erich Zimmermann (auth.)

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Extra resources for GAG: A Practical Compiler Generator

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All arithmetic operators are defined over the type INT. Operands of type "subrange of INT" are implicitly widened to INT; the result always has type INT. For integer division, the magnitude of the result is the largest integer not larger than the quotient of the magnitudes of the operands. The sign of the result is the sign of the product of the operands. The result of a MOD b is r, such that a=m*b+r for some integer m and 0 <= r < (magnitude of b). The values of the operands of relational operators (=, =/, <, >, <=, >=) will be balanced (see Sect.

It describes the type of the construct determined by its derivation, without considering type requirements imposed by the context it is embedded in. In the next example the type of a binary formula is determined by overloading resolution for the operator (described in the function f_dyadic_operatot). at_value := c_a_value END; The function f reduce converts the types of parameterless procedures to their result type, subrange types to their base types, and set types to a "canonical" set type. The attribute at kind specifies variable, a packed, unpacked, or a (compile time or runtime over that attribute are stated whether an expression stands for a or a tag field, a procedure identifier, computed) value.

With that assumption attribute evaluation is safe for any input and the minimum requirements for error handling are fulfilled a u t o m a t i c a l l y for any specification in ALADIN. The quality of the error handling is improved by a careful design of the context conditions according to the following general rules: a) Messages will be more specific where possible: C O N D I T I O N A MESSAGE CONDITION B MESSAGE if conjunctive conditions are split "A does not hold"; "B does not hold" instead of CONDITION A AND B MESSAGE "A or B does not hold", cf.

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