pTAL Reference Manual (G06.24+, H06.09+, J06.03+)

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procptr

is a procedure pointer identifier.

param-type

is any data type described in the data-type parameter of this syntax description.

Indirection

., .EXT, .EXT32, .EXT64, .SG, and .SGX are indirection symbols (see Table 14

(page 41)).

NOTE: The “Indirection Symbols” (page 41), .EXT32 and .EXT64 are 64-bit addressing

functionality added to the EpTAL compiler starting with SPR T0561H01^AAP. For more

information, see Appendix E, “64-bit Addressing Functionality” (page 531).

identifier

is an identifier (as described in Identifiers (page 42)).

referral

is the name of a previously declared structure or structure pointer. You must include

referral if the formal parameter identifier is the name of a structure.

Topics:

• Declaring Procedure Pointer Variables (page 266)

• Declaring Procedure Pointers in Structures (page 267)

• Declaring PROCPTRs as Formal Parameters (page 268)

• Assignments to Procedure Pointers (page 269)

• Dynamically Selected Procedure Calls (page 271)

Declaring Procedure Pointer Variables

procptr

is a procedure pointer identifier.

prev-identifier

is the identifier of a previously declared variable. On TNS architecture, prev-identifier

must be 16 bits. On TNS/R and TNS/E architecture, prev-identifier must be 32 bits or

more.

procaddr

is a constant or dynamic expression of type PROCADDR, PROC32ADDR, or PROC64ADDR.

procaddr must be the name of a procedure, procedure pointer, or PROCADDR,

PROC32ADDR, or PROC64ADDR variable. If procaddr is a procedure or procedure pointer,

the parameters of procptr and procaddr must match and the following procedure attributes

must match: EXTENSIBLE, VARIABLE, RETURNSCC, MAIN, and INTERRUPT; the following

procedure attributes do not have to match: OVERFLOW_TRAPS, CALLABLE, PRIV, and RESIDENT.

You can declare a procedure pointer anywhere a data declaration is valid. For purposes of

declarations, procedure pointers are treated as data, not as procedures.

The address type of a PROCPTR, PROC32PTR, and PROC64PTR is PROCADDR, PROC32ADDR,

and PROC64ADDR, respectively.

The address type of a procedure pointer variable is WADDR.

266 Procedures, Subprocedures, and Procedure Pointers