Compiler Construction for Digital Computers
Compiler Construction for Digital Computers
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During the compiling process certain name resolutions must be made to ascertain whether a particular name has been used previously. If it has been used previously, the attributes this particular name possesses must be noted for use during the execution process. If the name has not been used previously we assign default attributes. In some block structured languages, such as the procedural languages PL/I and ALGOL, a declaration of a name is made and there is a certain well defined region of the program over which the declaration is applicable.1 This region is called the scope of the name established by the declaration. In general, distinct declarations of the same identifier imply distinct names with non-overlapping scopes. In some internal blocks names are used without being explicitly declared. As a result, situations arise in which a resolution is required to establish the scope of a particular name.