May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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Run-Time Environment 209
7.1.8 Block-structured Languages
The concept of blocks is related to the scope rules in a language. Though different languages have
different scope rules, two most common rules are:
Declaration before use rule: It requires that an identifier be declared before it is used for any
purpose. This allows the Symbol Table being constructed as the program scanning proceeds and
references to a particular identifier, and updation of its attributes is possible during later phases of
compilation. As declaration also normally includes the type of the identifier, the type checking is
possible by the compiler, which reduces the programmer ...
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