[cfe-dev] RecursiveAstVisitor: How to find the open brace of the corresponding function declaration within a VisitCallExpr?

[Marcel Schaible via cfe-dev]

Thanks for your hint, which solved my problem.

Cheers

Marcel


Am 17.08.2017 um 17:02 schrieb Johannes Altmanninger:
> Marcel Schaible via cfe-dev <cfe-dev at lists.llvm.org> writes:
>
>> Hi,
>>
>> I want to retrieve in my RecursiveAstVisitor inside a VisitCallExpr
>> method the open brace of the corresponding function declaration.
>>
>> The code below does not find anything..
>>
>> Any idea what I am doing wrong and is there a more elegant way to
>> generate a variable declaration with a Rewriter?
> To find the opening brace of the enclosing function can store the
> current FunctionDecl as class member.
>
> class MyVisitor : RecursiveASTVisitor<MyVisitor> {
>
> FunctionDecl *Func = nullptr;
>
> bool VisitFunctionDecl(FunctionDecl *FD) {
>      Func = FD;
>      RecursiveASTVisitor<MyVisitor>::VisitFuncionDecl(FD);
> }
>
> };
>
> However, if you want the one of the called function, then just use
>
> FunctionDecl *FD = CallExpression->getDirectCallee();
> if (FD) {
>     ...
> }
>
>> Thanx
>>
>> Marcel
>>
>> bool VisitCallExpr(CallExpr *CallExpression) {
>> ...
>>           if (CallExpression != NULL) {
>>               const auto& parents = TheContext->getParents(CallExpression);
>>
>>               if (parents.empty()) {
>>                   llvm::errs() << "**** Can not find parent\n";
>>                   return false;
>>               }
>>
>>               auto parent = parents[0].get<DeclStmt>();
>>
>>               if (parent != NULL) {
>>                   llvm::errs() << "**** FOUND DECL STATEMENT ****\n";
>>                   SourceLocation l1 = parent->getLocStart();
>>                   TheRewriter.InsertText(l1, "/** found decl**/");
>>               }
>>               else
>>                   llvm::errs() << "**** DECL STATEMENT NOT FOUND ****\n";
>>
>> ...
>>
>> }
>>
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