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

Example 109 EXTADDR, EXT32ADDR, and EXT64ADDR Declarations

INT .EXT i;

STRING .EXT s;

INT .EXT g = 'SG' + 0;

REAL .EXT r;

INT .EXT32 i32;

STRING .EXT32 s32;

INT .EXT32 g32 = 'SG' + 0;

REAL .EXT32 r32;

INT .EXT64 i64;

STRING .EXT64 s64;

INT .EXT64 g64 = 'SG' + 0;

REAL .EXT64 r64;

Declaring Simple Pointers

A simple pointer declaration associates an identifier with a memory location that contains the

user-initialized address of a simple variable or array.

VOLATILE

specifies that the value of this variable must be maintained in memory, not in a register. Each

reference to a VOLATILE data item causes the data item to be read or written to memory even

when code is optimized. Based on the order of reads and writes in the source code, VOLATILE

also causes that precise order of memory references to be preserved, again, when code is

optimized.

type

is one of the following data types:

• BADDR

• CBADDR

• CWADDR

• EXTADDR

• EXT32ADDR

• EXT64ADDR

170 Pointers