New PDF release: A Concurrent Pascal Compiler for Minicomputers

By A. C. Hartmann

ISBN-10: 3540082409

ISBN-13: 9783540082408

ISBN-10: 3540373748

ISBN-13: 9783540373742

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Extra resources for A Concurrent Pascal Compiler for Minicomputers

Example text

For example in a routine with two integer variables, the f i r s t variable's displacement is minus one word and the second variable's displacement is minus two words. Parameters have positive backwards displacement with an offset of one word. Backwardsmeans their displacements are assigned in order from last declaration to f i r s t declaration. For example in a routine with two integer parameters, the last parameter's displacement is one word and the f i r s t parameter's displacement is two words.

Explicitly It introduces a declaration of the with temporary, and i t q u a l i f i e s entry or f i e l d names with the newly created temporary. Declaration analysis processes the declaration of the with temporary. This is an ex- ample of a declaration inside the body. Declaration analysis assigns a displacement to the with temporary. This displacement is the stack displacement where the with variable address is evaluated. At the end of the with statement, the temporary is popped from the stack.

This i n - formation includes: the name index the type length the active attributes the type "kind" information particular to individual kinds The name index of the type is retained. I t is transmitted in the intermediate code for use in type checking by body analysis. The length of the type is used for assign- ing displacements and may be incorporated in the final code. * the active attributes * The active attributes are a set of attributes associated with the type. whether the type contains an instance of an active type.

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


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