Method and apparatus for cross calling programs of different lex

Details Method and apparatus for cross calling programs of different lex Method and apparatus for cross calling programs of different lex

1995-10-02

1998-10-20

Voeltz, Emanuel T.

395685, G06F 945

Patent

active

058260870

ABSTRACT:
A method for enabling a computer program written in one scope to call a program written in another scope. The calling program may be statically or dynamically scoped and may call programs that are of a different scope. In a preferred embodiment of the invention, the method includes providing a call stack for programs called in the program, the call stack storing the names of the programs via a pointer and the dynamic or static scope of the called programs. The name pointer of a called program and its scope are pushed onto the call stack. For each non-local variable referenced in the called program, a lookup routine is followed. If the called program is dynamically scoped, the value associated with the variable's latest entry in its attribute stack is provided. If the called program is statically scoped, the value associated with the variable's latest active entry in the attribute stack is provided. In this way the scope of the called program is maintained even though the scope of the calling environment may differ.

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