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| <title>STABS: Cross-References</title> |
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| <a name="Cross_002dReferences"></a> |
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| Next: <a href="Subranges.html#Subranges" accesskey="n" rel="next">Subranges</a>, Previous: <a href="Miscellaneous-Types.html#Miscellaneous-Types" accesskey="p" rel="prev">Miscellaneous Types</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Cross_002dReferences-to-Other-Types"></a> |
| <h3 class="section">5.3 Cross-References to Other Types</h3> |
| |
| <p>A type can be used before it is defined; one common way to deal with |
| that situation is just to use a type reference to a type which has not |
| yet been defined. |
| </p> |
| <p>Another way is with the ‘<samp>x</samp>’ type descriptor, which is followed by |
| ‘<samp>s</samp>’ for a structure tag, ‘<samp>u</samp>’ for a union tag, or ‘<samp>e</samp>’ for |
| a enumerator tag, followed by the name of the tag, followed by ‘<samp>:</samp>’. |
| If the name contains ‘<samp>::</samp>’ between a ‘<samp><</samp>’ and ‘<samp>></samp>’ pair (for |
| C<tt>++</tt> templates), such a ‘<samp>::</samp>’ does not end the name—only a single |
| ‘<samp>:</samp>’ ends the name; see <a href="Nested-Symbols.html#Nested-Symbols">Nested Symbols</a>. |
| </p> |
| <p>For example, the following C declarations: |
| </p> |
| <div class="example"> |
| <pre class="example">struct foo; |
| struct foo *bar; |
| </pre></div> |
| |
| <p>produce: |
| </p> |
| <div class="example"> |
| <pre class="example">.stabs "bar:G16=*17=xsfoo:",32,0,0,0 |
| </pre></div> |
| |
| <p>Not all debuggers support the ‘<samp>x</samp>’ type descriptor, so on some |
| machines GCC does not use it. I believe that for the above example it |
| would just emit a reference to type 17 and never define it, but I |
| haven’t verified that. |
| </p> |
| <p>Modula-2 imported types, at least on AIX, use the ‘<samp>i</samp>’ type |
| descriptor, which is followed by the name of the module from which the |
| type is imported, followed by ‘<samp>:</samp>’, followed by the name of the |
| type. There is then optionally a comma followed by type information for |
| the type. This differs from merely naming the type (see <a href="Typedefs.html#Typedefs">Typedefs</a>) in |
| that it identifies the module; I don’t understand whether the name of |
| the type given here is always just the same as the name we are giving |
| it, or whether this type descriptor is used with a nameless stab |
| (see <a href="String-Field.html#String-Field">String Field</a>), or what. The symbol ends with ‘<samp>;</samp>’. |
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