[cfe-dev] Getting the pointer to an out-of-class VarDecl

[Manuel Klimek]

On Tue Sep 30 2014 at 12:44:02 PM Mihai Draghicioiu <
mihai.draghicioiu at gmail.com> wrote:

> Ah, I've figured out why this happens, it's because I call TraverseDecl
> from ASTConsumer::HandleTopLevelDecl(), so the full AST isn't traversed at
> this point. So now I need to figure out how to traverse the AST only after
> fully parsing it....
>
> class MyASTConsumer : public ASTConsumer {
>   public:
> virtual bool HandleTopLevelDecl(DeclGroupRef d) {
> typedef DeclGroupRef::iterator iter;
> MyRecursiveASTVisitor rv;
> for (iter b = d.begin(), e = d.end(); b != e; ++b) {
> rv.TraverseDecl(*b);
> }
> return true;
> }
> };
>

http://clang.llvm.org/docs/RAVFrontendAction.html
-> use HandleTranslationUnit

Cheers,
/Manuel


>
> On Tue, Sep 30, 2014 at 12:34 PM, Mihai Draghicioiu <
> mihai.draghicioiu at gmail.com> wrote:
>
>> > There is a helper like getDefiningDecl which will get the second
>> vardecl if you've already parsed it.
>>
>> Can you be more specific please? I can't find this helper method in any
>> class.
>>
>>
>> > A redeclaration chain contains all redeclarations, that's the idea, it
>> is a circular singly-linked list.
>> > You should be able to traverse the chain
>> with getFirstDecl(), getMostRecentDecl() and friends from Redeclarable.h.
>> I am able to traverse the chain, but if I traverse it inside
>> VisitVarDecl() or TraverseVarDecl(), upon the first VarDecl, the list only
>> contains itself, and uopn the second VarDecl, the list contains both.
>>
>> The code I used to test is this:
>>
>> void printSourceRange(SourceRange r) {
>> llvm::outs()
>> << r.getBegin().printToString(ci.getSourceManager())
>> << "---"
>> << r.getEnd().printToString(ci.getSourceManager());
>> }
>>
>> bool TraverseVarDecl(VarDecl *d) {
>> llvm::outs() << "VarDecl " << d->getName() << " @";
>> printSourceRange(d->getSourceRange());
>> llvm::outs() << "\n";
>> llvm::outs() << "first decl @";
>> printSourceRange(d->getFirstDecl()->getSourceRange());
>> llvm::outs() << "\n";
>> llvm::outs() << "most recent decl @";
>> printSourceRange(d->getMostRecentDecl()->getSourceRange());
>> llvm::outs() << "\n";
>> for(auto r: d->redecls()) {
>> llvm::outs() << "redecl " << d->getName() << " @";
>> printSourceRange(r->getSourceRange());
>> llvm::outs() << "\n";
>> }
>> return true;
>> }
>>
>> Output looks like this:
>>
>> VarDecl poop @foo.cpp:2:2---foo.cpp:2:13
>> first decl @foo.cpp:2:2---foo.cpp:2:13
>> most recent decl @foo.cpp:2:2---foo.cpp:2:13
>> redecl poop @foo.cpp:2:2---foo.cpp:2:13
>>
>> VarDecl poop @foo.cpp:5:1---foo.cpp:5:17
>> first decl @foo.cpp:2:2---foo.cpp:2:13
>> most recent decl @foo.cpp:5:1---foo.cpp:5:17
>> redecl poop @foo.cpp:5:1---foo.cpp:5:17
>> redecl poop @foo.cpp:2:2---foo.cpp:2:13
>>
>> As you can see, the only reference to the VarDecl at foo.cpp:5:1 i get is
>> upon the second call of TraverseVarDecl, and I want to get it at the first
>> call.
>>
>> Am I misunderstanding something, or doing something wrong? It looks like
>> the two VarDecls have two different lists of redeclarations, which do not
>> correspond.
>>
>> Thanks.
>>
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20140930/c8fcd8f2/attachment.html>