DATA
The DATA option affects whether storage
for dynamic data areas and other dynamic runtime storage is obtained
from above or below the 16 MB line.
Default is: DATA(31)
Abbreviations are: None
For reentrant programs, the DATA compiler
option and the HEAP runtime option control whether
storage for dynamic data areas (such as WORKING-STORAGE and FD record
areas) is obtained from below the 16 MB line (DATA(24))
or from unrestricted storage (DATA(31)). (DATA does
not affect the location of LOCAL-STORAGE data; the STACK runtime
option controls that location instead, along with the AMODE of
the program.)
Specify DATA(24) for
programs that run in 31-bit addressing mode and that pass data arguments
to programs in 24-bit addressing mode. Doing so ensures that the data
will be addressable by the called program.
External data
and QSAM buffers: The DATA option interacts with
other compiler options and runtime options that affect storage and
its addressability. See the related information for details.
DATA compiler
option setting influences how ALLOCATE acquires storage: - If
DATA(24)is in effect and theLOC 31phrase of theALLOCATEstatement is not specified,ALLOCATEacquires storage from below the 16 MB line. - If
DATA(31)is in effect and theLOC 24phrase of theALLOCATEstatement is not specified,ALLOCATEwill attempt to acquire storage from above the 16 MB line.
AMODE 64 considerations: The DATA(24) compiler
option is not supported when LP(64) is in effect.
If the DATA(24) option is specified explicitly, a
warning message is issued and the setting is discarded.
The LOCAL-STORAGE section is allocated from stack storage, which is managed by Language Environment®. LE allocates stack storage above the 2 GB bar in a 64-bit enclave.
Making programs reentrant
Language Environment Programming Guide (Using runtime options)
Allocation of buffers for QSAM files
RENT
ALLOCATE statement (Enterprise COBOL for z/OS Language Reference)