CRE Programmer's Guide

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Glossary

Common Run-Time Environment (CRE) Programmer’s Guide—528146-004

Glossary-11

TNS fixup

emulation software includes the TNS Object Code Interpreter (OCI), the TNS Object

Code Accelerator (OCA), and various millicode libraries. On a TNS/R system, the TNS

emulation software includes the TNS Object Code Interpreter (OCI), the Accelerator,

and various millicode libraries.

TNS fixup. A task performed at process startup time when executing a TNS object file. This

task involves building the procedure entry point (PEP) table and external entry point

(XEP) table and patching PCAL and XCAL instructions in a TNS object file before

loading the file into memory.

TNS instructions. Stack-oriented, 16-bit machine instructions that are directly executed on

TNS systems by hardware and microcode. TNS instructions can be emulated on

TNS/E and TNS/R systems by using millicode, an interpreter, and either translation or

acceleration.

Contrast with MIPS RISC instructions and Intel Itanium instructions.

TNS interpreted mode. A TNS emulation environment on a TNS/R or TNS/E system in

which individual TNS instructions in a TNS object file are directly executed by

interpretation rather than permanently translated into MIPS or Itanium instructions.

TNS interpreted mode runs slower than TNS accelerated mode. Each TNS instruction

is decoded each time it is executed, and no optimizations between TNS instructions

are possible. TNS interpreted mode is used when a TNS object file has not been

accelerated for that hardware system, and it is also sometimes used for brief periods

within accelerated object files. Accelerated or interpreted TNS object code cannot be

mixed with or called by native-mode object code. See also TNS Object Code

Interpreter (OCI). Contrast with TNS accelerated mode, TNS/R native mode, and

TNS/E native mode

TNS library. A single, optional, TNS-compiled loadfile associated with one or more

application loadfiles. If a user library has its own global or static variables, it is called a

TNS shared run-time library (TNS SRL)

. Otherwise it is called a user library.

TNS mode. Synonym for TNS interpreted mode.

TNS object code. The TNS instructions that result from processing program source code

with a TNS compiler. TNS object code executes on TNS, TNS/E, and TNS/R systems.

TNS Object Code Accelerator (OCA). A program optimization tool that processes a TNS

object file and produces an accelerated file for a TNS/E system. OCA augments a TNS

object file with equivalent Itanium instructions. TNS object code that is accelerated

runs faster on TNS/E systems than TNS object code that is not accelerated.