82 lines
5.1 KiB
HTML
82 lines
5.1 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Machine interface instructions" />
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<meta name="abstract" content="Programs and procedures are the two basic units of execution on iSeries." />
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<meta name="description" content="Programs and procedures are the two basic units of execution on iSeries." />
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<meta name="DC.Relation" scheme="URI" content="MIpgmg.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/qprcrtpg.htm" />
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<meta name="DC.Relation" scheme="URI" content="../rzatk/mitoc.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="MIintro" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Machine interface instructions</title>
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</head>
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<body id="MIintro"><a name="MIintro"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Machine interface instructions</h1>
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<div><p>Programs and procedures are the two basic units of execution on iSeries™.</p>
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<p>Programs come in two flavors: the original program model (OPM) and the Integrated
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Language Environment<sup>®</sup> (ILE). MI programs can be created only for the OPM
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environment. If you require ILE support in the development of your applications,
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use ILE C, ILE COBOL, or ILE RPG and the languages' built-in MI support.</p>
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<p>In the OPM environment, a program is comprised of two basic components:
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the object definition table (ODT) and an instruction stream. In the case of
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MI programs, the program is created using the Create Program (QPRCRTPG) API.</p>
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<p>The ODT is the means for defining all objects (program data elements) that
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are referred to by the MI instruction stream. An ODT definition of an object
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does not actually allocate storage for the object. It does, however, define
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when and how much storage is to be allocated and also the attributes of the
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storage (for example, the data type of the object). The ODT is built from
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the declare (DCL) statements found in the source used to create a program.
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Because DCL statements are actually instructions to the QPRCRTPG API and not
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MI instructions, they are defined in the QPRCRTPG API.</p>
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<p>The types of objects that can be declared are:</p>
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<p>The instruction stream defines the set of operations to be performed by
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the program. The instruction stream is built from the MI instructions found
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in the source used to create a program. The various MI instructions that you
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can use are defined in the iSeries Machine Interface instructions.</p>
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<p>Within the source used to create a program, there is a type of statement
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called a directive. Directive statements can be found in the QPRCRTPG API
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and are used to do the following:</p>
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<ul><li>Control the formatting of the output listing, such as the title, page
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ejection, and so on.</li>
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<li>Define entry points within the program for external and internal calls.</li>
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<li>Define breakpoints within the program to associate a breakpoint name to
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a particular MI instruction.</li>
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<li>Specify the end of the program source.</li>
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</ul>
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<p>The program end (PEND) directive must be the last statement in the source,
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and it functions as a return external (RTX) MI instruction if logically processed
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as part of the instruction stream.</p>
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<p>Noncomment source statements (declares, instructions, and directives) are
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always ended by a semicolon (<samp class="codeph">;</samp>). Comments always begin with
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a slash and asterisk (<samp class="codeph">/*</samp>) and end with an asterisk and slash
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(<samp class="codeph">*/</samp>).</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="MIpgmg.htm" title="Provides information about creating machine interface (MI) programs.">Machine interface programming</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../apis/qprcrtpg.htm">Create Program (QPRCRTPG) API</a></div>
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<div><a href="../rzatk/mitoc.htm">iSeries Machine Interface instructions</a></div>
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</div>
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</div>
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</body>
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</html>
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