M.2 Implementation-Defined Characteristics
1/2
{implementation defined (summary of characteristics)} The Ada language allows for certain machine dependences in a controlled manner. {documentation (required of an implementation)} Each Ada implementation must document all implementation−defined characteristics:
1.a
Ramification: {unspecified} {specified (not!)} It need not document unspecified characteristics.
1.b
Some of the items in this list require documentation only for implementations that conform to Specialized Needs Annexes.
2/2
- Whether or not each recommendation given in Implementation Advice is followed −− see M.3, "M.3 Implementation Advice" for a listing. See 1.1.2(37).
3
- Capacity limitations of the implementation. See 1.1.3(3).
4
- Variations from the standard that are impractical to avoid given the implementation's execution environment. See 1.1.3(6).
5
- Which code_statements cause external interactions. See 1.1.3(10).
5.1/2
- The semantics of an Ada program whose text is not in Normalization Form KC. See 2.1(4.1/2).
6
- The coded representation for the text of an Ada program. See 2.1(4/2).
7/2
- This paragraph was deleted.
8
- The representation for an end of line. See 2.2(2/2).
9
- Maximum supported line length and lexical element length. See 2.2(14).
10
- Implementation−defined pragmas. See 2.8(14).
11
- Effect of pragma Optimize. See 2.8(27).
11.1/2
- The sequence of characters of the value returned by S'Wide_Image when some of the graphic characters of S'Wide_Wide_Image are not defined in Wide_Character. See 3.5(30/2).
12/2
- The sequence of characters of the value returned by S'Image when some of the graphic characters of S'Wide_Wide_Image are not defined in Character. See 3.5(37/2).
13
- The predefined integer types declared in Standard. See 3.5.4(25).
14
- Any nonstandard integer types and the operators defined for them. See 3.5.4(26).
15
- Any nonstandard real types and the operators defined for them. See 3.5.6(8).
16
- What combinations of requested decimal precision and range are supported for floating point types. See 3.5.7(7).
17
- The predefined floating point types declared in Standard. See 3.5.7(16).
18
- The small of an ordinary fixed point type. See 3.5.9(8/2).
19
- What combinations of small, range, and digits are supported for fixed point types. See 3.5.9(10).
19.1/2
- The sequence of characters of the value returned by Tags.Expanded_Name (respectively, Tags.Wide_Expanded_Name) when some of the graphic characters of Tags.Wide_Wide_Expanded_Name are not defined in Character (respectively, Wide_Character). See 3.9(10.1/2).
20/2
- The result of Tags.Wide_Wide_Expanded_Name for types declared within an unnamed block_statement. See 3.9(10).
21
- Implementation−defined attributes. See 4.1.4(12/1).
21.1/2
- Rounding of real static expressions which are exactly half−way between two machine numbers. See 4.9(38/2).
22
- Any implementation−defined time types. See 9.6(6).
23
- The time base associated with relative delays. See 9.6(20).
24
- The time base of the type Calendar.Time. See 9.6(23).
25/2
- The time zone used for package Calendar operations. See 9.6(24/2).
26
- Any limit on delay_until_statements of select_statements. See 9.6(29).
26.1/2
- The result of Calendar.Formating.Image if its argument represents more than 100 hours. See 9.6.1(86/2).
27
- Whether or not two nonoverlapping parts of a composite object are independently addressable, in the case where packing, record layout, or Component_Size is specified for the object. See 9.10(1).
28
- The representation for a compilation. See 10.1(2).
29
- Any restrictions on compilations that contain multiple compilation_units. See 10.1(4).
29.1/2
- The mechanisms for adding a compilation unit mentioned in a limited_with_clause to an environment. See 10.1.4(3).
30
- The mechanisms for creating an environment and for adding and replacing compilation units. See 10.1.4(3/2).
31
- The implementation−defined means, if any, of specifying which compilation units are needed by a given compilation unit. See 10.2(2).
32
- The manner of explicitly assigning library units to a partition. See 10.2(2).
33
- The manner of designating the main subprogram of a partition. See 10.2(7).
34
- The order of elaboration of library_items. See 10.2(18).
35
- Parameter passing and function return for the main subprogram. See 10.2(21).
36
- The mechanisms for building and running partitions. See 10.2(24).
37
- The details of program execution, including program termination. See 10.2(25).
38
- The semantics of any nonactive partitions supported by the implementation. See 10.2(28).
39
- The information returned by Exception_Message. See 11.4.1(10.1/2).
39.1/2
- The sequence of characters of the value returned by Exceptions.Exception_Name (respectively, Exceptions.Wide_Exception_Name) when some of the graphic characters of Exceptions.Wide_Wide_Exception_Name are not defined in Character (respectively, Wide_Character). See 11.4.1(12.1/2).
40/2
- The result of Exceptions.Wide_Wide_Exception_Name for exceptions declared within an unnamed block_statement. See 11.4.1(12).
41
- The information returned by Exception_Information. See 11.4.1(13/2).
41.1/2
- Implementation−defined policy_identifiers allowed in a pragma Assertion_Policy. See 11.4.2(9/2).
41.2/2
- The default assertion policy. See 11.4.2(10/2).
41.3/2
- Existence and meaning of second parameter of pragma Unsuppress. See 11.5(27.1/2).
42
- Implementation−defined check names. See 11.5(27).
42.1/2
- The cases that cause conflicts between the representation of the ancestors of a type_declaration. See 13.1(13.1/2).
43
- Any restrictions placed upon representation items. See 13.1(20).
44
- The interpretation of each aspect of representation. See 13.1(20).
44.1/2
- The set of machine scalars. See 13.3(8.1/2).
45
- The meaning of Size for indefinite subtypes. See 13.3(48).
46
- The default external representation for a type tag. See 13.3(75/1).
47
- What determines whether a compilation unit is the same in two different partitions. See 13.3(76).
48
- Implementation−defined components. See 13.5.1(15).
49
- If Word_Size = Storage_Unit, the default bit ordering. See 13.5.3(5).
50/2
- The contents of the visible part of package System. See 13.7(2).
50.1/2
- The range of Storage_Elements.Storage_Offset, the modulus of Storage_Elements.Storage_Element, and the declaration of Storage_Elements.Integer_Address.. See 13.7.1(11).
51
- The contents of the visible part of package System.Machine_Code, and the meaning of code_statements. See 13.8(7).
52/2
- The effect of unchecked conversion for instances with nonscalar result types whose effect is not defined by the language. See 13.9(11).
52.1/2
- The result of unchecked conversion for instances with scalar result types whose result is not defined by the language. See 13.9(11).
53
- Whether or not the implementation provides user−accessible names for the standard pool type(s). See 13.11(17).
54/2
- This paragraph was deleted.
55/2
- The meaning of Storage_Size when neither the Storage_Size nor the Storage_Pool is specified for an access type. See 13.11(18).
56/2
- This paragraph was deleted.
57/2
- The set of restrictions allowed in a pragma Restrictions. See 13.12(7/2).
58
- The consequences of violating limitations on Restrictions pragmas. See 13.12(9).
59/2
- The contents of the stream elements read and written by the Read and Write attributes of elementary types. See 13.13.2(9).
60
- The names and characteristics of the numeric subtypes declared in the visible part of package Standard. See A.1(3).
60.1/2
- The values returned by Strings.Hash. See A.4.9(3/2).
61
- The accuracy actually achieved by the elementary functions. See A.5.1(1).
62
- The sign of a zero result from some of the operators or functions in Numerics.Generic_Elementary_Functions, when Float_Type'Signed_Zeros is True. See A.5.1(46).
63
- The value of Numerics.Discrete_Random.Max_Image_Width. See A.5.2(27).
64
- The value of Numerics.Float_Random.Max_Image_Width. See A.5.2(27).
65/2
- This paragraph was deleted.
66
- The string representation of a random number generator's state. See A.5.2(38).
67/2
- This paragraph was deleted.
68
- The values of the Model_Mantissa, Model_Emin, Model_Epsilon, Model, Safe_First, and Safe_Last attributes, if the Numerics Annex is not supported. See A.5.3(72).
69/2
- This paragraph was deleted.
70
- The value of Buffer_Size in Storage_IO. See A.9(10).
71/2
- The external files associated with the standard input, standard output, and standard error files. See A.10(5).
72
- The accuracy of the value produced by Put. See A.10.9(36).
72.1/1
- Current size for a stream file for which positioning is not supported. See A.12.1(1.1/1).
73/2
- The meaning of Argument_Count, Argument, and Command_Name for package Command_Line. The bounds of type Command_Line.Exit_Status. See A.15(1).
73.1/2
- The interpretation of file names and directory names. See A.16(46/2).
73.2/2
- The maximum value for a file size in Directories. See A.16(87/2).
73.3/2
- The result for Directories.Size for a directory or special file See A.16(93/2).
73.4/2
- The result for Directories.Modification_Time for a directory or special file. See A.16(95/2).
73.5/2
- The interpretation of a non−null search pattern in Directories. See A.16(104/2).
73.6/2
- The results of a Directories search if the contents of the directory are altered while a search is in progress. See A.16(110/2).
73.7/2
- The definition and meaning of an environment variable. See A.17(1/2).
73.8/2
- The circumstances where an environment variable cannot be defined. See A.17(16/2).
73.9/2
- Environment names for which Set has the effect of Clear. See A.17(17/2).
73.10/2
- The value of Containers.Hash_Type'Modulus. The value of Containers.Count_Type'Last. See A.18.1(7/2).
74
- Implementation−defined convention names. See B.1(11).
75
- The manner of choosing link names when neither the link name nor the address of an imported or exported entity is specified. See B.1(36).
76
- The meaning of link names. See B.1(36).
77
- The effect of pragma Linker_Options. See B.1(37).
78
- The contents of the visible part of package Interfaces and its language−defined descendants. See B.2(1).
79/2
- Implementation−defined children of package Interfaces. See B.2(11).
79.1/2
- The definitions of certain types and constants in Interfaces.C. See B.3(41).
80/1
- The types Floating, Long_Floating, Binary, Long_Binary, Decimal_Element, and COBOL_Character; and the initializations of the variables Ada_To_COBOL and COBOL_To_Ada, in Interfaces.COBOL. See B.4(50).
80.1/1
- The types Fortran_Integer, Real, Double_Precision, and Character_Set in Interfaces.Fortran. See B.5(17).
81/2
- Implementation−defined intrinsic subprograms. See C.1(1).
82/2
- This paragraph was deleted.
83/2
- This paragraph was deleted.
83.1/2
- Any restrictions on a protected procedure or its containing type when a pragma Attach_handler or Interrupt_Handler applies. See C.3.1(17).
83.2/2
- Any other forms of interrupt handler supported by the Attach_Handler and Interrupt_Handler pragmas. See C.3.1(19).
84/2
- This paragraph was deleted.
85
- The semantics of pragma Discard_Names. See C.5(7).
86
- The result of the Task_Identification.Image attribute. See C.7.1(7).
87/2
- The value of Current_Task when in a protected entry, interrupt handler, or finalization of a task attribute. See C.7.1(17/2).
88/2
- This paragraph was deleted.
88.1/1
- Granularity of locking for Task_Attributes. See C.7.2(16/1).
89/2
- This paragraph was deleted.
90/2
- This paragraph was deleted.
91
- The declarations of Any_Priority and Priority. See D.1(11).
92
- Implementation−defined execution resources. See D.1(15).
93
- Whether, on a multiprocessor, a task that is waiting for access to a protected object keeps its processor busy. See D.2.1(3).
94/2
- The effect of implementation−defined execution resources on task dispatching. See D.2.1(9/2).
95/2
- This paragraph was deleted.
96/2
- This paragraph was deleted.
97/2
- Implementation defined task dispatching policies. See D.2.2(18).
97.1/2
- The value of Default_Quantum in Dispatching.Round_Robin. See D.2.5(4).
98
- Implementation−defined policy_identifiers allowed in a pragma Locking_Policy. See D.3(4).
98.1/2
- The locking policy if no Locking_Policy pragma applies to any unit of a partition. See D.3(6).
99
- Default ceiling priorities. See D.3(10/2).
100
- The ceiling of any protected object used internally by the implementation. See D.3(16).
101
- Implementation−defined queuing policies. See D.4(1/1).
102/2
- This paragraph was deleted.
103
- Any operations that implicitly require heap storage allocation. See D.7(8).
103.1/2
- When restriction No_Task_Termination applies to a partition, what happens when a task terminates. See D.7(15.1/2).
103.2/2
- The behavior when restriction Max_Storage_At_Blocking is violated. See D.7(17/1).
103.3/2
- The behavior when restriction Max_Asynchronous_Select_Nesting is violated. See D.7(18/1).
103.4/2
- The behavior when restriction Max_Tasks is violated. See D.7(19).
104/2
- Whether the use of pragma Restrictions results in a reduction in program code or data size or execution time. See D.7(20).
105/2
- This paragraph was deleted.
106/2
- This paragraph was deleted.
107/2
- This paragraph was deleted.
108
- The means for creating and executing distributed programs. See E(5).
109
- Any events that can result in a partition becoming inaccessible. See E.1(7).
110
- The scheduling policies, treatment of priorities, and management of shared resources between partitions in certain cases. See E.1(11).
111/1
- This paragraph was deleted.
112
- Whether the execution of the remote subprogram is immediately aborted as a result of cancellation. See E.4(13).
112.1/2
- The range of type System.RPC.Partition_Id. See E.5(14).
113/2
- This paragraph was deleted.
114
- Implementation−defined interfaces in the PCS. See E.5(26).
115
- The values of named numbers in the package Decimal. See F.2(7).
116
- The value of Max_Picture_Length in the package Text_IO.Editing See F.3.3(16).
117
- The value of Max_Picture_Length in the package Wide_Text_IO.Editing See F.3.4(5).
117.1/2
- The value of Max_Picture_Length in the package Wide_Wide_Text_IO.Editing See F.3.5(5).
118
- The accuracy actually achieved by the complex elementary functions and by other complex arithmetic operations. See G.1(1).
119
- The sign of a zero result (or a component thereof) from any operator or function in Numerics.Generic_Complex_Types, when Real'Signed_Zeros is True. See G.1.1(53).
120
- The sign of a zero result (or a component thereof) from any operator or function in Numerics.Generic_Complex_Elementary_Functions, when Complex_Types.Real'Signed_Zeros is True. See G.1.2(45).
121
- Whether the strict mode or the relaxed mode is the default. See G.2(2).
122
- The result interval in certain cases of fixed−to−float conversion. See G.2.1(10).
123
- The result of a floating point arithmetic operation in overflow situations, when the Machine_Overflows attribute of the result type is False. See G.2.1(13).
124
- The result interval for division (or exponentiation by a negative exponent), when the floating point hardware implements division as multiplication by a reciprocal. See G.2.1(16).
125
- The definition of close result set, which determines the accuracy of certain fixed point multiplications and divisions. See G.2.3(5).
126
- Conditions on a universal_real operand of a fixed point multiplication or division for which the result shall be in the perfect result set. See G.2.3(22).
127
- The result of a fixed point arithmetic operation in overflow situations, when the Machine_Overflows attribute of the result type is False. See G.2.3(27).
128
- The result of an elementary function reference in overflow situations, when the Machine_Overflows attribute of the result type is False. See G.2.4(4).
129
- The accuracy of certain elementary functions for parameters beyond the angle threshold. See G.2.4(10).
130
- The value of the angle threshold, within which certain elementary functions, complex arithmetic operations, and complex elementary functions yield results conforming to a maximum relative error bound. See G.2.4(10).
131
- The result of a complex arithmetic operation or complex elementary function reference in overflow situations, when the Machine_Overflows attribute of the corresponding real type is False. See G.2.6(5).
132
- The accuracy of certain complex arithmetic operations and certain complex elementary functions for parameters (or components thereof) beyond the angle threshold. See G.2.6(8).
132.1/2
- The accuracy requirements for the subprograms Solve, Inverse, Determinant, Eigenvalues and Eigensystem for type Real_Matrix. See G.3.1(81/2).
132.2/2
- The accuracy requirements for the subprograms Solve, Inverse, Determinant, Eigenvalues and Eigensystem for type Complex_Matrix. See G.3.2(149/2).
133/2
- This paragraph was deleted.
134/2
- This paragraph was deleted.
135/2
- This paragraph was deleted.
136/2
- This paragraph was deleted.
136.1/2
- Implementation−defined policy_identifiers allowed in a pragma Partition_Elaboration_Policy. See H.6(4/2).