[cfe-dev] Life time of AST elements.

[Manuel Klimek via cfe-dev]

On Mon, Oct 12, 2015 at 2:37 PM Frank Redeker via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hello all,
>
> I'm writing a tool to analyze the call hierarchy of functions (methods)
> using ClangTool.
>
> My idea is to collect the TranslationUnitDecls given to my own
> ASTCosumer's HandleTranslationUnit method and traverse them later when
> ClangTool.run() has finished.
>
> But it seems that the AST nodes are no longer valid after
> ClangTool.run() has returned. (e.g. If I call getQualifiedNameAsString()
> on a FunctionDecl object retrieved from the TranslationUnitDecl, I get
> `Assertion failed: DC && "This decl is not contained in a translation
> unit!"`)
>
> So I wonder if there is any trick to extend the life time for the AST or
> should I use ClangTool.buildAST() rather then ClangTool.run() to get the
> ASTs ?
>

The idea is to do the reverse:
Store any information about the AST you want later in some data structure
in the callback.


>
>
> Frank
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