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5.11 Function Types

Various types can be defined for function variables. These types are not used in defining functions (see section 2.5 Procedures); they are used for things like pointers to functions.

The simple, traditional, type is type descriptor `f' is followed by type information for the return type of the function, followed by a semicolon.

This does not deal with functions for which the number and types of the parameters are part of the type, as in Modula-2 or ANSI C. AIX provides extensions to specify these, using the `f', `F', `p', and `R' type descriptors.

First comes the type descriptor. If it is `f' or `F', this type involves a function rather than a procedure, and the type information for the return type of the function follows, followed by a comma. Then comes the number of parameters to the function and a semicolon. Then, for each parameter, there is the name of the parameter followed by a colon (this is only present for type descriptors `R' and `F' which represent Pascal function or procedure parameters), type information for the parameter, a comma, 0 if passed by reference or 1 if passed by value, and a semicolon. The type definition ends with a semicolon.

For example, this variable definition:

 
int (*g_pf)();

generates the following code:

 
.stabs "g_pf:G24=*25=f1",32,0,0,0
    .common _g_pf,4,"bss"

The variable defines a new type, 24, which is a pointer to another new type, 25, which is a function returning int.


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