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GNAT IMPLEMENTED FEATURES LIST
Current as of 01/26/95
Here is the list of implemented and not implemented features. A more precise
description of the GNAT system is provided in the file 'gnatinfo.txt', which
is part of the GNAT distribution.
Latest features in GNAT version 2.02
====================================
Extension aggregates are implemented (not much tested so far)
The Storage_Pool mechanism is in place
Functions returning unconstrained values shouldn't leak anymore
Enumeration representation clauses are fully implemented
Record representation clauses are implemented (currently there is
a restriction that all fields must be given a position and tagged
records cannot yet be given representation clauses)
The constrained attribute is implemented
Conformance checking is fully implemented
Shared variables (pragmas Shared, Atomic, Atomic_Components,
Volatile, and Volatile_Components) are implemented
User-defined Initialize/Adjust/Finalize is now almost complete for
controlled types as well as for types containing controlled components.
(aggregates involving controlled types and functions returning objects
with controlled components may still cause trouble).
Alignment attribute and attribute definition clause are implemented
Pred and Succ for fixed-point types are implemented
Discard_Names pragma is implemented
Arrays are passed properly to convention C routines
Pragma Inspection_Point is implemented
Pragma Locking_Policy is implemented
Pragma Task_Dispatching_Policy is implemented
Pragma Memory_Size is implemented (it is ignored anyway)
Derived types from private types are impelmented
Floating-point attribute functions are implemented:
Adjacent, Ceiling, Compose, Copy_Sign, Exponent, Floor, Fraction,
Leading_Part, Machine, Model, Pred, Remainder, Rounding, Scaling, Succ,
Truncation, Unbiased_Rounding
Pragma Optimize is implemented (checks that GCC optimization level is
consistent)
Pragma Reviewable is implemented (checks that GCC debug option "-g" is set)
Pragma Controlled is implemented (but ignored so far)
The attributes Version and Body_Version are implemented
Pragma Linker_Options is implemented
Attribute Max_Size_In_Storage_Elements is implemented
The attribute Valid is implemented
Requeue without abort is implemented
Delay statement on OS/2 is now working correctly.
The attribute Bit_Order is implemented
Range checking for modular types
Length checks are now implemented
Pragma Import Fortran and COBOL are implemented
Pragma Convention is now fully implemented (for C, Fortran, COBOL),
Pragma Convention for Fortran correctly maps multi-dimensional arrays
=======================================================================
Status of Features
============================================================================
= All of Ada 83 is implemented EXCEPT the following unimplemented features =
============================================================================
The following language-defined checks are not implemented:
Discriminant Checks
Elaboration Checks
Range Checks on the elaboration of a subtype_indication
Stack overflow checking
Language-Defined Pragmas
Pack for arrays
Input-Output for Integer for type Long_Long_Integer.
(only Put currently supported for Long_Long_Integer not Get)
Delay is not yet fixed-point as required (the current temporary
implementation uses floating-point to represent Delay).
Tasking is currently implemented only on the following platforms
SGI IRIX 5.2, Sun Sparc (SunOS 4.1), i386 running IBM OS/2
=========================================================================
= All of Ada 95 implemented EXCEPT the following unimplemented features =
=========================================================================
CORE
Protected entry families
Protected subprogram pointers
Condition protected entry calls
Requeue Statement involving task entries
Delay until
Input-Output for Modular Types
(Only Put is supported currently, Get not yet supported)
Input-Output for Decimal Types
Input-Output for Wide Text
Objects of type with unknown discriminants
Unimplemented subprograms in package Ada.Text_IO
Flush
Look_Ahead
Get_Immediate
Accessibility checks
Stream-Oriented Attributes of Specific Types
Stream-Oriented Attributes of Class-Wide Types
ANNEX A. PREDEFINED LANGUAGE ENVIRONMENT
Ada.Exceptions
Ada.Interrupts
Ada.Streams.Stream_IO
Ada.Wide_Text_IO
Ada.Wide_Text_IO.Complex_IO
ANNEX B. INTERFACING TO OTHER LANGUAGES
The body of Interfaces.COBOL is not yet implemented
ANNEX C. SYSTEMS PROGRAMMING
Machine intrinsic subprograms
Interrupt support
The body of package Interrupts is not implemented
Preelaboration requirements are not fully met
ANNEX D. REAL-TIME SYSTEMS
Tasking restrictions
Synchronous task control
ANNEX E. DISTRIBUTED SYSTEMS
The distribution annex is under active development. Stub generation
is not yet implemented, and there is no configuration control program.
All pragmas are fully implemented.
ANNEX F. INFORMATION SYSTEMS
Ada.Text_IO.Editing
Ada.Wide_Text_IO.Editing
ANNEX G. NUMERICS
Accuracy requirements for floating-point and complex not fully met
ANNEX H. SAFETY AND SECURITY
pragma Normalize_Scalars
Safety and security restrictions
ANNEX I. OBSOLESCENT FEATURES
Interrupt entries
ANNEX J. LANGUAGE-DEFINED ATTRIBUTES
Caller
Definite
External_Tag
Identity
Input
Output
Read
Storage_Pool
Write
ANNEX K. LANGUAGE DEFINED PRAGMAS
Attach_Handler
Export
Interrupt_Handler
Normalize_Scalars
Queuing_Policy
Restrictions
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