Programming Language Pragmatics, Fourth Edition
Programming Language Pragmatics, Fourth Edition
4th Edition
ISBN: 9780124104099
Author: Michael L. Scott
Publisher: Elsevier Science
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Chapter 4, Problem 25E

Explanation of Solution

Modified pseudo-code of Figure 4.14:

macro declare_name (id, cur_item, next_item : syntax_tree_node; t : type)

if (id.name, ?) ε cur_item.symtab

next_item.errors_in := cur_item.errors_in

+ ["redefinition of" id.name "at" cur_item.location]

next_item.symtab := prepend ((id.name, error), cur_item.symtab)

else

next_item.errors_in := cur_item.errors_in

next_item.symtab := prepend (id.name, t), cur_item.symtab)

Explanation:

  • The key idea is to represent the symbol table as a stack particularly, a linked list onto which the programmer push new elements at the front...

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Programming Language Pragmatics, Fourth Edition

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