Language Environment-conforming assembler invoking an HLL main routine
When a C, C++, or PL/I main routine is called from Language Environment-conforming assembler, the actions in Table 1 take place.
Note: Unlike C, C++, and PL/I, COBOL
has no mechanism to statically declare a program “main”; rather, a
"main" program is determined dynamically when a COBOL program is the
first program in an enclave. Therefore, it is meaningful to call a
COBOL "main", only in the context of creating a new enclave in which
a COBOL program is the first to run. Only parts of the following tables
apply to a COBOL main.
| Type of assembler invocation | Language Environment is up |
|---|---|
| CEELOAD macro | CEE393 is signaled. CEELOAD cannot load a main routine. |
| CEEFETCH macro | Nested enclave is not created. The COBOL program could be a main in this case. |
| EXEC CICS® LINK and EXEC CICS XCTL | Nested enclave is created. The COBOL program could be a main in this case. |
| EXEC CICS LOAD and BALR | This is not supported. |
| LINK | Nested enclave is created. The COBOL program could be a main in this case. |
| LOAD and BALR | CEE393 is signaled. You cannot LOAD
and BALR a main routine under Language Environment. This is supported in COBOL because the COBOL program would be a subroutine, not a main. |
| Note: See z/OS Language Environment Programming Guide
for information about nested enclaves.
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