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DEC Ada
Technical Overview and Comparison on DIGITAL Platforms
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Contents (summary)
Preface Preface
Chapter 1 An Introduction to DEC Ada
Chapter 2 Types and Objects
Chapter 3 Pragmas
Chapter 4 Tasking and Task-Related Features
Chapter 5 Input-Output Facilities
Chapter 6 Library of Predefined Units
Chapter 7 Compiler and Program Management
Chapter 8 DEC Ada to GNAT Report Mapper
Chapter 9 Debugging Facilities
Chapter 10 Other Compiler Features and Issues
Chapter 11 Comparison Summaries
Appendix A For More Information
Appendix B Extended Float Package for OpenVMS Alpha Systems
Appendix C A Comparison of Rational's VADS for DIGITAL UNIX with DEC Ada for DIGITAL UNIX Systems
Appendix D A Comparison of Rational's Apex and DEC Ada for DIGITAL UNIX Systems
Appendix E A Comparison of DEC Ada for OpenVMS and GNAT for OpenVMS Alpha Systems
Appendix F Sample Listings
  Index
  Examples
  Tables

Contents

Preface
Preface Preface
Chapter 1
1 An Introduction to DEC Ada
     1.1     DEC Ada Components
     1.2     Environments
     1.3     DEC Ada Features
Chapter 2
2 Types and Objects
     2.1     Integer Types
     2.2     Floating-Point Types
         2.2.1         Pragma FLOAT_REPRESENTATION
         2.2.2         Pragma LONG_FLOAT (OpenVMS Systems Only)
         2.2.3         Representation Attributes for Floating-Point Types
         2.2.4         Model Numbers for Floating-Point Types
         2.2.5         Safe Numbers for Floating-Point Types
         2.2.6         Floating-Point Computations
     2.3     Fixed-Point Types
     2.4     Array Types
     2.5     Record Types
     2.6     Access Types
     2.7     Address Types
     2.8     STARLET Bindings Restriction
     2.9     Task Types
     2.10     Component Alignment
     2.11     Representation Clauses
         2.11.1         Length Clauses
         2.11.2         Address Clauses
         2.11.3         Storage Representation Pragmas
     2.12     Storage Allocation and Deallocation
Chapter 3
3 Pragmas
     3.1     Language-Defined Pragmas
     3.2     Implementation-Defined Pragmas
     3.3     Pragmas Supplied on Other Ada Implementations
Chapter 4
4 Tasking and Task-Related Features
     4.1     Threads and DECthreads
         4.1.1         Assigning Task IDs
         4.1.2         Terminating Tasks
     4.2     Task Storage Allocation
         4.2.1         Task Control Block
         4.2.2         Task Stack
         4.2.3         Stack Overflow
         4.2.4         Task-Related Storage Pragmas
     4.3     Task Scheduling
         4.3.1         Scheduling Strategies
         4.3.2         Controlling Task Scheduling
         4.3.3         Controlling Task Priorities
     4.4     External Interrupts (OpenVMS Systems)
     4.5     External Interrupts (DIGITAL UNIX and ULTRIX Systems)
     4.6     Special Tasking Considerations
         4.6.1         Passive Tasks
         4.6.2         Delay Statements and Related Issues
         4.6.3         Shared Variables
         4.6.4         Abort Statements
Chapter 5
5 Input-Output Facilities
     5.1     File Elements
     5.2     The FORM Parameter in DEC Ada
         5.2.1         The FORM Parameter on OpenVMS Systems
         5.2.2         The FORM Parameter on DIGITAL UNIX Systems
         5.2.3         The FORM Parameter on ULTRIX Systems
     5.3     Relative and Indexed Files (OpenVMS Only)
     5.4     Mixed-Type Input-Output
     5.5     Text Input-Output
     5.6     Input-Output in Tasking Programs
     5.7     Exceptions in Input-Output
Chapter 6
6 Library of Predefined Units
     6.1     Standard Units
     6.2     Implementation-Defined DEC Ada Packages
         6.2.1         Implementation-Defined DEC Ada Packages Common to All Platforms
             6.2.1.1             DEC Ada Packages That Aid Migration to the Ada 95 Standard
         6.2.2         Packages Available on OpenVMS Systems Only
         6.2.3         Packages Available on DIGITAL UNIX Systems Only
     6.3     DEC Ada Predefined Instantiations
     6.4     Bindings
Chapter 7
7 Compiler and Program Management
     7.1     Program Library Management
         7.1.1         Program Library Units
         7.1.2         Compilation Management
         7.1.3         Working with Multiple Program Libraries
     7.2     Program Library Management Commands
     7.3     Compilation Options
     7.4     Exceptions
     7.5     Compiler Messages
Chapter 8
8 DEC Ada to GNAT Report Mapper
     8.1     Report Mapper Description
     8.2     ADAMAP Operation
     8.3     Qualifiers
     8.4     ADAMAP Output
     8.5     Sample Command Input
         8.5.1         Sample ADAMAP Output
     8.6     DEC Ada to GNAT Mapper on the Web
Chapter 9
9 Debugging Facilities
     9.1     Debugging on OpenVMS Systems
     9.2     Debugging on DIGITAL UNIX and ULTRIX Systems
Chapter 10
10 Other Compiler Features and Issues
     10.1     Lexical Elements
     10.2     Run-Time System Issues
         10.2.1         Inclusion of the Run-Time Library with the Product Kit
         10.2.2         Storage Management
         10.2.3         Subprogam Call Parameter Handling
     10.3     Mixed-Language Programming
     10.4     User Interface
     10.5     Compiler Performance
         10.5.1         Compiler Optimizations
         10.5.2         Improving Performance with Pragma INLINE
         10.5.3         Improving Performance of Programs Using Generics
         10.5.4         Other Performance Considerations
     10.6     Implementation-Dependent Characteristics
Chapter 11
11 Comparison Summaries
     11.1     Determining DEC Ada Program Portability
     11.2     Factors Affecting Portability
     11.3     Features Listed in the Portability Summary
     11.4     Porting Between Specific Platforms: Comparison Tables
         11.4.1         Porting from DEC Ada for OpenVMS VAX Systems to OpenVMS Alpha Systems
         11.4.2         Porting from DEC Ada for OpenVMS VAX Systems to DIGITAL UNIX Systems
         11.4.3         Porting from DEC Ada for ULTRIX Systems to DIGITAL UNIX Systems
Appendix A
Appendix A For More Information
Appendix B
Appendix B Extended Float Package for OpenVMS Alpha Systems
Appendix C
Appendix C A Comparison of Rational's VADS for DIGITAL UNIX with DEC Ada for DIGITAL UNIX Systems
     C.1     Language-Related Features
         C.1.1         Integer Types
         C.1.2         Floating-Point Numbers and Representations
         C.1.3         Record Representation Clause Maximum Alignment
         C.1.4         Record and Array Component Alignment
         C.1.5         Type DURATION
         C.1.6         Other VADS-Specific Type Information
     C.2     Representation Clauses
         C.2.1         ADDRESS Attribute---VADS Implementations
         C.2.2         Restrictions on Unchecked Type Conversions
         C.2.3         Additional Representation Clause Information---VADS Implementations
         C.2.4         Restrictions on Representation Clauses---DEC Ada Implementations
     C.3     Dope Vectors
     C.4     Parameter Passing
     C.5     Package STANDARD
     C.6     Package SYSTEM
     C.7     Tasking and Task-Related Features
         C.7.1         Implementation of Tasks in DEC Ada for DIGITAL UNIX Systems
         C.7.2         Task-Related Pragmas
         C.7.3         Scheduling and Task Priority
         C.7.4         External Interrupts
     C.8     Pragmas and Pragma-Related Features
         C.8.1         Pragma-Related Restrictions
     C.9     Library of Predefined Units
         C.9.1         Implementation-Defined Packages
     C.10     Bindings
         C.10.1         Interfaces to C
         C.10.2         Other Features and Restrictions
     C.11     Implementation-Defined Attributes
     C.12     Compiler and Run-Time Interfacing
     C.13     User Interface
     C.14     Input-Output
     C.15     Implementation Limits

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