HP 3000 Manuals HP 3000 Manuals
Impact on Users
Switch is used in the following areas:
* Phased migration of existing applications
* Recompilation into Native Mode of existing source code that contains
calls to user-written CM SL procedures
* New NM applications that call user-written CM SL procedures
Members of the following groups will make use of Switch:
1. Suppliers of application programs and subsystems who
want to migrate that software to Native Mode in a phased
approach
2. Users who choose to recompile existing source code with
MPE XL-based NM compilers (HP Pascal/XL, HP FORTRAN
77/XL, COBOL II/XL) and whose original source contains
calls to user-written CM procedures that remain in CM
SLs and where rewriting these procedures in an NM
language is impractical or impossible
3. Developers of new NM programs that require the services
of non-intrinsic CM procedures
4. Users with performance-sensitive MPE V/E SL procedures
who want to recompile or rewrite those procedures in
Native Mode to get the best performance, but also want
CM programs to continue to call the procedures
5. Suppliers of application software who need to provide
access to their routines from both modes
If you fall into the first category, you should do the following:
* Generate NM--> CM Switch calls (coded in-line or in Switch stubs) to
non-intrinsic CM procedures
* Generate CM--> NM Switch calls (coded in-line or in Switch stubs)
from CM procedures to NM procedures
* Incorporate into an MPE XL Executable Library any new NM procedures
that CM procedures call via Switch
* Understand the performance factors that affect mixed-mode procedure
calls
Members of the second category should do the following:
* Recompile application programs written in Pascal, FORTRAN, or COBOL
with the appropriate NM compiler
* Generate Switch calls (either by means of in-line code or Switch
stubs linked with the converted programs) to user-written CM
procedures that remain in CM SLs
Those in the third category should do the following:
* Generate Switch calls (either via in-line code or Switch stubs linked
with the new NM programs) to CM procedures
Those in the fourth category should do the following:
* Write NM procedures to replace performance-critical CM procedures and
place them in an Executable Library
* Generate CM--> NM Switch calls (through in-line code or Switch stubs)
to these NM procedures
Those in the final category should do the following:
* Generate the appropriate NM--> CM Switch calls (coded in-line or in
Switch stubs)
* Generate the appropriate CM--> NM Switch calls (coded in-line or in
Switch stubs)
* Incorporate into an MPE XL Executable Library any new NM procedures
that CM procedures call via Switch
* Incorporate into a CM SL any new CM procedures that NM procedures
call via Switch
* Understand the performance factors that affect mixed-mode procedure
calls