<div dir="ltr">On Wed, Apr 6, 2016 at 11:34 AM, Jordan Rose <span dir="ltr"><<a href="mailto:jordan_rose@apple.com" target="_blank">jordan_rose@apple.com</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><span class=""><br><div><blockquote type="cite"><div>On Apr 6, 2016, at 11:31, Saleem Abdulrasool <<a href="mailto:compnerd@compnerd.org" target="_blank">compnerd@compnerd.org</a>> wrote:</div><br><div>On Wed, Apr 6, 2016 at 11:18 AM, Jordan Rose<span> </span><span dir="ltr"><<a href="mailto:jordan_rose@apple.com" target="_blank">jordan_rose@apple.com</a>></span><span> </span>wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hey, Saleem. How do you expect this to differ from normal symbol visibility? It seems to me that in a shared library, any public symbol is either exported or imported, depending on whether it has a definition, and any non-public symbol is default. (Unlike C, we expect to have sensible rules here.) I guess there's the difference between "a public symbol from elsewhere in this library" and "a public symbol from some other library". Is that it?<br></blockquote><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Well, there are four cases to consider:</div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">- externally available: imported<br></div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div>- defined (and available for others): exported</div></div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">- defined (statically): default -- won't even show up, so this is a no-op</div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">- defined (non-statically defined for internal use): default</div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">The thing is that there is no modeling for internal symbols which other shared objects can use. The closest thing you can do is anonymize the symbol (so you don't have a name that you can call it by, but you have an integral ID).</div></div></div></div></blockquote></div><br></span><div>What is an "internal symbol which other shared objects can use"? That sounds like a self-contradiction.</div></div></blockquote><div><br></div><div>This is used for things like providing private hooks across shared objects. These would usually be anonymized (nameless), but you get an integral ID that gives you an index into a table of pointers to the function or variable that you are interested in.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><span class="HOEnZb"><font color="#888888"><div>Jordan</div></font></span></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Saleem Abdulrasool<br>compnerd (at) compnerd (dot) org</div>
</div></div>