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Glossary

TNSVU User’s Guide—528143-003

Glossary-25

TNS compiler

Library (SL). UC and UL exist on a per-process basis. SC and SL exist on a per-node

basis.

TNS compiler. A compiler in the TNS development environment that generates 16-bit TNS

object code following the TNS conventions for memory, stacks, 16-bit registers, and

call linkage. The TNS C compiler is an example of such a compiler. Contrast with

TNS/R native compiler and TNS/E native compiler.

TNS Emulation Library. A public dynamic-link library (DLL) on a TNS/E system containing

the TNS Object Code Interpreter (OCI), millicode routines used only by accelerated

mode, and millicode for switching among interpreted, accelerated, and native

execution modes. See also Shared Millicode Library.

TNS emulation software. The set of tools, libraries, and system services for running TNS

object code on TNS/E systems and TNS/R systems. On a TNS/E system, the TNS

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. See also TNS mode, procedure entry-point (PEP) table,

and external entry-point (XEP) table.

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 Intel® 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 (UL).

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