Data Definition Language (DDL) Reference Manual

Introduction to DDL

Data Definition Language (DDL) Reference Manual—529431-004

1-11

Generating Source Code

TNS and Native Compilers

The native compilers align data for optimal performance on TNS/R and TNS/E systems

by default. This default alignment is different and incompatible with the default

alignment generated by the TNS compilers.

Because of this data alignment incompatibility, the D40 DDL compiler was enhanced to

generate source code that produces the same data alignment, regardless of whether

the TNS compilers or native compilers are used. To ensure the same data alignment,

the D40 DDL compiler emits fieldalign shared2 pragmas for C and FIELDALIGN

SHARED2 directives for TAL and pTAL.

Host-language source code files used by native programs and shared with TNS

programs must be generated using a version D40 or later DDL compiler. Host-

language source code files supplied by HP have already been generated by the correct

version of the DDL compiler.

Figure 1-4. Generating Source Code

15> DDL / IN schema

Generate source code

(entire schema)

16> DDL DICT

!?COBOL cobfile

!OUTPUT RECORD rec1 rec2.

!OUTPUT DEF def1 def2.

!EXIT

Generate source code (selected

records and definitions)

DDL

Source

Schema

COBOL

Source

Code

Dictionary

COBOL

Source

Code

? DICT

? COBOL

cobfile

DEF . . .

RECORD . . .

VST004.vsd