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9 Representation Clauses and Pragmas

This section describes the representation clauses accepted by GNAT, and their effect on the representation of corresponding data objects.

GNAT fully implements Annex C (Systems Programming). This means that all the implementation advice sections in chapter 13 are fully implemented. However, these sections only require a minimal level of support for representation clauses. GNAT provides much more extensive capabilities, and this section describes the additional capabilities provided.

• Alignment Clauses:  
• Size Clauses:  
• Storage_Size Clauses:  
• Size of Variant Record Objects:  
• Biased Representation:  
• Value_Size and Object_Size Clauses:  
• Component_Size Clauses:  
• Bit_Order Clauses:  
• Effect of Bit_Order on Byte Ordering:  
• Pragma Pack for Arrays:  
• Pragma Pack for Records:  
• Record Representation Clauses:  
• Handling of Records with Holes:  
• Enumeration Clauses:  
• Address Clauses:  
• Use of Address Clauses for Memory-Mapped I/O:  
• Effect of Convention on Representation:  
• Conventions and Anonymous Access Types:  
• Determining the Representations chosen by GNAT:  

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