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POWhat is invalid SourceLocation in clang and how to interact with it?
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  1. POWhat is invalid SourceLocation in clang and how to interact with it?
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    copied!<p> I need to replace some variable declarations with others.</p> <p>For example</p> <pre class="lang-c++ prettyprint-override"><code>int a = 5; </code></pre> <p>becomes </p> <pre class="lang-c++ prettyprint-override"><code>T&lt;int&gt; a = 5; </code></pre> <p>More generic </p> <pre class="lang-c++ prettyprint-override"><code>X a = _const; </code></pre> <p>becomes </p> <pre class="lang-c++ prettyprint-override"><code>T&lt;X&gt; a = _const; </code></pre> <p>I tried to implement an ASTVisitor descendant in clang:</p> <pre class="lang-c++ prettyprint-override"><code>bool VisitVarDecl(Decl *f) { if (VarDecl* VD = dyn_cast_or_null&lt;VarDecl&gt;(f)){ Expr* init = VD-&gt;getInit(); SourceRange definition = VD-&gt;getDefinition()-&gt;getSourceRange(); FullSourceLoc exprLoc = ctx.getFullLoc(init-&gt;getLocStart()); FullSourceLoc vLoc = ctx.getFullLoc(VD-&gt;getLocStart()); ... </code></pre> <p>I want to replace the definition of variable in the next way:</p> <pre class="lang-c++ prettyprint-override"><code>TheRewriter.ReplaceText(VD-&gt;getLocStart(), exprLoc.getSpellingColumnNumber()-vLoc.getSpellingColumnNumber(), someSting); </code></pre> <p>But any call exprLoc.getSpellingColumnNumber() leads to segmentation fault. For example I just try to print exprLoc.getSpellingColumnNumber():</p> <pre class="lang-c++ prettyprint-override"><code>llvm::outs()&lt;&lt; "init start at " &lt;&lt;exprLoc.getSpellingColumnNumber(&amp;isValid) &lt;&lt;" is "&lt;&lt;(isValid?"valid ":"invalid ") &lt;&lt;", decl start at " &lt;&lt;vLoc.getSpellingColumnNumber() &lt;&lt;".\n"; </code></pre> <p>And output is init start at 9 is invalid , decl start at 1. &lt;…> Segmentation fault</p> <p>What does it mean “invalid” SourceLocation and how to interact with it?</p>
 

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