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PASCAL Implementation: P4 Compiler Compiler and Assembler by Steven Pemberton, Martin C. Daniels

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By Steven Pemberton, Martin C. Daniels

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Extra info for PASCAL Implementation: P4 Compiler Compiler and Assembler Interpreter (Ellis Horwood Series in Computers and Their Applications)

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Never gets accepted as a substitute for ':='. Does type index=0:9 ever get accepted? How about for labels? a:=0 2. Label 1 is really just a loop while commentskipped do or repeat... until symbolfound. Consider the changes necessary. Another solution would be to replace the goto 1 by a (recursive) call to insymbol. 3. ] that the assignments for ( $ space . ' : < > are all unnecessary, since these single character symbols and operators are dealt with individually elsewhere. ] for < and >. General Notes on the Lexical Analyser 1.

4. In this compiler, if two arrays have equal bounds and compatible element types, their run-time sizes must be equal. Therefore the test at [991] is redundant. 5. When comparing records, when two fields have been found to be incompatible, further comparison is unnecessary. So [996] should start "while comp and". 6. Note that the identifiers of fields play no part in compatibility. max. j 7. The representation of the empty set has elset set to nil (see [2833]), so that the call of comptypes at [986] will always return true if one of the sets is empty (due to line [953]).

570] Insert the new identifier. [572] Set the subtrees of the new identifier to nil. Routine searchid, lines [588-626] This procedure is called to locate an identifier in the identifier table. Pascal's scope rules require that first the local declarations be searched, then in the surrounding block, and so on outwards. To effect this, searchid searches each tree in display from top down to 0 until the identifier is found, or it is discovered that the identifier was not declared, in which case a special 'undeclared' entry is returned.

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