reverse-enginnering tools

[Eitan Froumine]

Can anybody recommend C and PASCAL Reverse Engineering tools for
for UNIX and MSDOS environment?

   For example, tools which generate:

   1. Trees of static relationships between function/procedures calls.

   2. Cross references which show relationships between global variables
      and the functions/procedures that access them.

Are there any such Public Domain tools (besides of grep)?

Thanks 

Eitan

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