C/C++ Programmer's Guide (G06.27+, H06.08+, J06.03+)

11 Migrating Programs to TNS/R or TNS/E Native Mode
HP NonStop native mode enables you to write programs that are fully optimized for TNS/R or
TNS/E systems such as NonStop servers. The term TNS/R native means the program uses the
process, memory, and instruction set architectures that are native to RISC processors. The term
TNS/E native means the program uses the process, memory, and instruction set architectures that
are native to Intel Itanium processors.
Native compilers and tools are used to generate native programs. Other tools have been enhanced
to support native programs. Native programs can be written in the native Portable Transaction
Application Language, pTAL (a dialect of the Transaction Application Language, TAL), C, C++,
and native COBOL.
Common tasks required to migrate a TNS C or C++ program to native mode include:
• Convert programs to use 32-bit pointers and values of type int (the wide or 32-bit data model
and the large-memory model).
• Replace obsolete keywords and external function declarations.
• Change code that uses _cc_status for return values.
• Change code that relies on arithmetic overflow traps.
• Replace calls to C library functions that cannot be called by native programs.
• Remove obsolete pragmas.
• Specify most pragmas on the command line instead of in source files.
The TNS and native C compilers conform to the ISO/ANSI C language standard. Source code
that compiles without warnings or errors with the TNS C compiler or C++ preprocessor might get
warnings or errors using the native C and C++ compilers. (In most cases, the native compilers are
better than the TNS compilers in detecting violations to the ISO/ANSI C standard.)
The native mode C and C++ migration tool, NMCMT, can help you migrate programs to native
mode. The migration tool scans source files and produces a diagnostic listing. The diagnostic listing
identifies C and C++ language source code changes required to migrate from TNS C and C++
to native C and C++.
The migration tool detects most but not all changes required to migrate a TNS program to a native
program.The migration tool does not detect changes required in areas outside the C and C++
languages, such as the Guardian and CRE application program interface (API), or related to
converting programs to use the 32-bit data model. For conversion details, see Converting Programs
to the ILP32 Data Model (page 326).
You can use the migration tool in either the Guardian or the OSS environment. The migration tool
is also integrated into TDS on the PC.
For more detailed information on:
• Running the migration tool and on migrating TNS programs to TNS/R native mode, see the
TNS/R Native Application Migration Guide.
Migrating TNS/R programs to TNS/E native mode,
See the H-series Application Migration Guide.
152 Migrating Programs to TNS/R or TNS/E Native Mode