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C & C++ for Coverage and Operations

Overview
This course is designed to give Coverage and Operations staff a detailed introduction to C & C++ in the z/TPF Environment. Staff are often required to work with and debug newer programs written in C or C++ without having taken any formal programming training in these languages. Students will be taken through the layout of C and C++ programs, the structure of the language, compilation units and linkage, header files and Dump Analysis. This course is not designed to teach programming itself, but enable staff to understand and interpret existing programs. It is a practical 5 day course with lectures, interspersed with exercises to consolidate the knowledge gained.

Pre-requisites
Prior Mainframe Assembler and z/TPF knowledge is required.

Audience
Any staff who are required to work with exisiting programs written in C or C++ for the z/TPF Platform..

Objectives
By the end of the course, the delegates will be able, with the aid of course notes to:

 

        Understand the layout and structure of C & C++ programs in z/TPF.

        Identify header files used within compilation units.

        Understand the use of the .mak file for building CSOs.

        Use the .mak output and listing to identify the source code instruction in error.

        Use the listing to identify variables held in registers vs the stack.

        Locate function stacks within a dump and identify variable values within the stack.

Course Outline

Introduction

Objectives
Terminology

Program Structure

Data Types, variables, enums, typedefs
Decision Making
Loops
Functions
Compilation Units
The CSO (program and Library)
C vs C++
C++ - Classes and Methods overview

Listings

Interpreting Pseudo Assembler
Optimisation and its uses
Function Prologs and Epilogs
Understanding the Stack

DLM & DLL

Components
Build Scripts (makefile)
Understanding the output from Build Process

PreProcessor

#pragma options
Understanding Conditional Compilations

Header Files

Standard z/TPF Header Files
DSect vs Header File
Packing structures
Pitfalls

Optimisation

Register vs Stack Usage
Inlining

Assembler

Interfacing with existing programs
TPF_regs structure

Linkages

Identify different linkage types
Function and Variable descriptors
Static Storage in depth

Program Interfaces

C to C/C++
C to Assembler
Assembler to C
Parameter List

Dump Analysis

Review existing knowledge
Example Ctl3 and Ctl75
C/C++ Dump Tags
Function stacks and their layout
Identifying variable and parameter values
Heap Storage and its Layout
Program and Library Dump Analysis

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