Method handleSignalOrSlot

generator/qtsupport.cpp:72–256

* \a obj is an expression to a type of an QObject (or pointer to) that is the sender or the receiver * \a method is an expression like SIGNAL(....) or SLOT(....) * * This function try to find the matching signal or slot declaration, and register its use. */

 * This function try to find the matching signal or slot declaration, and register its use.
 */
void QtSupport::handleSignalOrSlot(clang::Expr* obj, clang::Expr* method)
{
    if (!obj || !method) return;
    obj = obj->IgnoreImpCasts();
    method = method->IgnoreImpCasts();
    auto objType = obj->getType().getTypePtrOrNull();
    if (!objType) return;

    const clang::CXXRecordDecl* objClass = objType->getPointeeCXXRecordDecl();
    if (!objClass) {
        // It can be a non-pointer if called like:  foo.connect(....);
        objClass = objType->getAsCXXRecordDecl();
        if (!objClass) return;
    }

    const clang::StringLiteral *methodLiteral = clang::dyn_cast<clang::StringLiteral>(method);
    if (!methodLiteral) {
        // try qFlagLocation
        clang::CallExpr *flagLoc = clang::dyn_cast<clang::CallExpr>(method);

        if (!flagLoc || flagLoc->getNumArgs() != 1 || !flagLoc->getDirectCallee()
            || flagLoc->getDirectCallee()->getName() != "qFlagLocation") return;


        methodLiteral = clang::dyn_cast<clang::StringLiteral>(flagLoc->getArg(0)->IgnoreImpCasts());
        if (!methodLiteral) return;
    }
    if (methodLiteral->getCharByteWidth() != 1) return;


    auto signature = methodLiteral->getString().trim();
    if (signature.size() < 4)
        return;

    if (signature.find('\0') != signature.npos) {
        signature = signature.substr(0, signature.find('\0')).trim();
    }

    auto lParenPos = signature.find('(');
    auto rParenPos = signature.find(')');
    if (rParenPos == std::string::npos || rParenPos < lParenPos || lParenPos < 2)
        return;

    llvm::StringRef methodName = signature.slice(1 , lParenPos).trim();

    // Try to find the method which match this name in the given class or bases.
    auto candidates = lookUpCandidates(objClass, methodName);

    clang::LangOptions lo;
    lo.CPlusPlus = true;
    lo.Bool = true;
    clang::PrintingPolicy policy(lo);
    policy.SuppressScope = true;

    auto argPos = lParenPos + 1;
    unsigned int arg = 0;
    while (argPos < signature.size() && !candidates.empty()) {