[cfe-dev] Iterate over struct's fields

[Hayrapetyan, Anahit via cfe-dev]

Hi Miklos,

Yes, I tried getUnderlyingType(). Here is the code I have:


void iterateTypeFields(const clang::Type* type)
{
    clang::RecordDecl* recordDecl;
    if (auto* typedefType = llvm::dyn_cast<clang::TypedefType>(type)) {
        typedefType->getDecl()->getUnderlyingType()->dump();
        iterateTypeFields(&*typedefType->getDecl()->getUnderlyingType());
    } else if (auto* elaboratedType = llvm::dyn_cast<clang::ElaboratedType>(type)) {
        elaboratedType->getNamedType()->dump();
        iterateTypeFields(&*elaboratedType->getNamedType());

    } else if (auto* recordType = llvm::dyn_cast<clang::RecordType>(type)) {
        recordType->dump();
        recordDecl = recordType->getDecl()->getDefinition();
    } else if (type->isStructureType()) {
        recordDecl = type->getAsStructureType()->getDecl();
    } else {
        return;
    }
    int i  = 0;
    for (auto it = recordDecl->field_begin(); it != recordDecl->field_end(); ++it) {
          // Do stuff

    }
}

When this code is ran on the example I posted, first I get TypedefType, then its' underlying type is ElaboratedType which getNamedType is the RecordType. So this function is called with TypedefType, then ElaboratedType then RecordType. However when I try to call field_begin function on RecordDecl obtained from RecordType it crashes in clang sources. That's why I'm assuming that I'm doing something wrong here.


Thanks!


________________________________
From: Miklos Vajna <vmiklos at vmiklos.hu>
Sent: Wednesday, February 6, 2019 9:46 AM
To: Hayrapetyan, Anahit
Cc: cfe-dev at lists.llvm.org
Subject: Re: [cfe-dev] Iterate over struct's fields

Hi,

On Tue, Feb 05, 2019 at 08:38:36PM +0000, "Hayrapetyan, Anahit via cfe-dev" <cfe-dev at lists.llvm.org> wrote:
>  How can I get the real RecordDecl, the one that also has FieldDecls for struct?

Did you try getUnderlyingType()? See
<http://clang.llvm.org/doxygen/classclang_1_1TypedefNameDecl.html>.

Regards,

Miklos
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