Compilers: Principles and Practice by Pearson

454 Appendix C

ESD

Provide the information necessary to build the External Symbols Dictionary or the symbol table.

There are three types of external symbols:

Module Definition, MD Name of the module;

Local Definition, LD Label of a locally defined area;

External Reference, ER A symbol which is an MD or LD in exactly one place in some other module.

Each MD and ER is identified by an integer (ID) used for reference in an rld record.

RLD

Records have the following information:

1. The location and size of each address constant that will change due to relocation or linking.

2. The external symbol by which the address constant should be modified.

3.