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<H1> 6.3.1 Conformance Rules</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> <A NAME="I2954"></A><A NAME="I2955"></A><A NAME="I2956"></A><A NAME="I2957"></A><A NAME="I2958"></A>When
subprogram profiles are given in more than one place, they are required
to conform in one of four ways: type conformance, mode conformance, subtype
conformance, or full conformance. </DIV>
<H4 ALIGN=CENTER>Static Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>2/1</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> <A NAME="I2959"></A><A NAME="I2960"></A>As
explained in <A HREF="RM-B-1.html">B.1</A>, ``<A HREF="RM-B-1.html">Interfacing
Pragmas</A>'', a <I>convention</I> can be specified for an entity. Unless
this International Standard states otherwise, the default convention
of an entity is Ada. For a callable entity or access-to-subprogram type,
the convention is called the <I>calling convention</I>. The following
conventions are defined by the language: </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC><A NAME="I2961"></A><A NAME="I2962"></A>The default calling
convention for any subprogram not listed below is <I>Ada</I>. A <FONT FACE="Arial, Helvetica">pragma</FONT>
Convention, Import, or Export may be used to override the default calling
convention (see <A HREF="RM-B-1.html">B.1</A>). </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<UL Class="Bulleted" Style="margin-bottom: 0.3em"><LI TYPE=DISC><A NAME="I2963"></A><A NAME="I2964"></A>The <I>Intrinsic</I>
calling convention represents subprograms that are ``built in'' to the
compiler. The default calling convention is Intrinsic for the following:
</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<UL Class="NestedBulleted"><LI TYPE=DISC>an enumeration literal;</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<UL Class="NestedBulleted"><LI TYPE=DISC>a "/=" operator declared implicitly due to the
declaration of "=" (see <A HREF="RM-6-6.html">6.6</A>);</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<UL Class="NestedBulleted"><LI TYPE=DISC>any other implicitly declared subprogram unless it is a
dispatching operation of a tagged type;</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<UL Class="NestedBulleted"><LI TYPE=DISC>an inherited subprogram of a generic formal tagged type
with unknown discriminants; </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>9</FONT></DIV>
<UL Class="NestedBulleted"><LI TYPE=DISC>an attribute that is a subprogram;</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>10</FONT></DIV>
<UL Class="NestedBulleted"><LI TYPE=DISC>a subprogram declared immediately within a <FONT FACE="Arial, Helvetica">protected_body</FONT>.
</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>11</FONT></DIV>
<UL Class="Bulleted">The Access attribute is not allowed for Intrinsic
subprograms. </UL>
<DIV Class="Paranum"><FONT SIZE=-2>12</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC><A NAME="I2965"></A><A NAME="I2966"></A>The default calling
convention is <I>protected</I> for a protected subprogram, and for an
access-to-subprogram type with the reserved word <B>protected</B> in
its definition.</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>13</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC><A NAME="I2967"></A><A NAME="I2968"></A>The default calling
convention is <I>entry</I> for an entry.</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>13.1/1</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>If not specified above as Intrinsic, the calling convention
for any inherited or overriding dispatching operation of a tagged type
is that of the corresponding subprogram of the parent type. The default
calling convention for a new dispatching operation of a tagged type is
the convention of the type. </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>14</FONT></DIV>
<DIV Class="Normal"> Of these four conventions, only Ada and Intrinsic
are allowed as a <I>convention_</I><FONT FACE="Arial, Helvetica">identifier</FONT>
in a <FONT FACE="Arial, Helvetica">pragma</FONT> Convention, Import,
or Export. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>15</FONT></DIV>
<DIV Class="Normal"> <A NAME="I2969"></A><A NAME="I2970"></A>Two profiles
are <I>type conformant</I> if they have the same number of parameters,
and both have a result if either does, and corresponding parameter and
result types are the same, or, for access parameters, corresponding designated
types are the same. <A NAME="I2971"></A></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>16</FONT></DIV>
<DIV Class="Normal"> <A NAME="I2972"></A><A NAME="I2973"></A>Two profiles
are <I>mode conformant</I> if they are type-conformant, and corresponding
parameters have identical modes, and, for access parameters, the designated
subtypes statically match. <A NAME="I2974"></A></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>17</FONT></DIV>
<DIV Class="Normal"> <A NAME="I2975"></A><A NAME="I2976"></A>Two profiles
are <I>subtype conformant</I> if they are mode-conformant, corresponding
subtypes of the profile statically match, and the associated calling
conventions are the same. The profile of a generic formal subprogram
is not subtype-conformant with any other profile. <A NAME="I2977"></A></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>18</FONT></DIV>
<DIV Class="Normal"> <A NAME="I2978"></A><A NAME="I2979"></A>Two profiles
are <I>fully conformant</I> if they are subtype-conformant, and corresponding
parameters have the same names and have <FONT FACE="Arial, Helvetica">default_expression</FONT>s
that are fully conformant with one another. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>19</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> <A NAME="I2980"></A>Two
expressions are <I>fully conformant</I> if, after replacing each use
of an operator with the equivalent <FONT FACE="Arial, Helvetica">function_call</FONT>:
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>20</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>each constituent construct of one corresponds to an instance
of the same syntactic category in the other, except that an expanded
name may correspond to a <FONT FACE="Arial, Helvetica">direct_name</FONT>
(or <FONT FACE="Arial, Helvetica">character_literal</FONT>) or to a different
expanded name in the other; and</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>21</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>each <FONT FACE="Arial, Helvetica">direct_name</FONT>,
<FONT FACE="Arial, Helvetica">character_literal</FONT>, and <FONT FACE="Arial, Helvetica">selector_name</FONT>
that is not part of the <FONT FACE="Arial, Helvetica">prefix</FONT> of
an expanded name in one denotes the same declaration as the corresponding
<FONT FACE="Arial, Helvetica">direct_name</FONT>, <FONT FACE="Arial, Helvetica">character_literal</FONT>,
or <FONT FACE="Arial, Helvetica">selector_name</FONT> in the other; and
</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>21.1/1</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>each <FONT FACE="Arial, Helvetica">attribute_designator</FONT>
in one must be the same as the corresponding <FONT FACE="Arial, Helvetica">attribute_designator</FONT>
in the other; and</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>22</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>each <FONT FACE="Arial, Helvetica">primary</FONT> that
is a literal in one has the same value as the corresponding literal in
the other. </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>23</FONT></DIV>
<DIV Class="Normal"> <A NAME="I2981"></A>Two <FONT FACE="Arial, Helvetica">known_discriminant_part</FONT>s
are <I>fully conformant</I> if they have the same number of discriminants,
and discriminants in the same positions have the same names, statically
matching subtypes, and <FONT FACE="Arial, Helvetica">default_expression</FONT>s
that are fully conformant with one another. <A NAME="I2982"></A></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>24</FONT></DIV>
<DIV Class="Normal"> <A NAME="I2983"></A>Two <FONT FACE="Arial, Helvetica">discrete_subtype_definition</FONT>s
are <I>fully conformant</I> if they are both <FONT FACE="Arial, Helvetica">subtype_indication</FONT>s
or are both <FONT FACE="Arial, Helvetica">range</FONT>s, the <FONT FACE="Arial, Helvetica">subtype_mark</FONT>s
(if any) denote the same subtype, and the corresponding <FONT FACE="Arial, Helvetica">simple_expression</FONT>s
of the <FONT FACE="Arial, Helvetica">range</FONT>s (if any) fully conform.
</DIV>
<H4 ALIGN=CENTER>Implementation Permissions</H4>
<DIV Class="Paranum"><FONT SIZE=-2>25</FONT></DIV>
<DIV Class="Normal"> An implementation may declare an operator declared
in a language-defined library unit to be intrinsic.</DIV>
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