C++ TIntermSequence::front方法代码示例

void TLValueTrackingTraverser::traverseAggregate(TIntermAggregate *node)
{
    bool visit = true;

    TIntermSequence *sequence = node->getSequence();
    switch (node->getOp())
    {
        case EOpFunction:
        {
            TIntermAggregate *params = sequence->front()->getAsAggregate();
            ASSERT(params != nullptr);
            ASSERT(params->getOp() == EOpParameters);
            addToFunctionMap(node->getNameObj(), params->getSequence());
            break;
        }
        case EOpPrototype:
            addToFunctionMap(node->getNameObj(), sequence);
            break;
        default:
            break;
    }

    if (preVisit)
        visit = visitAggregate(PreVisit, node);

    if (visit)
    {
        bool inFunctionMap = false;
        if (node->getOp() == EOpFunctionCall)
        {
            inFunctionMap = isInFunctionMap(node);
            if (!inFunctionMap)
            {
                // The function is not user-defined - it is likely built-in texture function.
                // Assume that those do not have out parameters.
                setInFunctionCallOutParameter(false);
            }
        }

        incrementDepth(node);

        if (inFunctionMap)
        {
            TIntermSequence *params             = getFunctionParameters(node);
            TIntermSequence::iterator paramIter = params->begin();
            for (auto *child : *sequence)
            {
                ASSERT(paramIter != params->end());
                TQualifier qualifier = (*paramIter)->getAsTyped()->getQualifier();
                setInFunctionCallOutParameter(qualifier == EvqOut || qualifier == EvqInOut);

                child->traverse(this);
                if (visit && inVisit)
                {
                    if (child != sequence->back())
                        visit = visitAggregate(InVisit, node);
                }

                ++paramIter;
            }

            setInFunctionCallOutParameter(false);
        }
        else
        {
            if (node->getOp() == EOpSequence)
                pushParentBlock(node);
            else if (node->getOp() == EOpFunction)
                mInGlobalScope = false;

            // Find the built-in function corresponding to this op so that we can determine the
            // in/out qualifiers of its parameters.
            TFunction *builtInFunc = nullptr;
            TString opString = GetOperatorString(node->getOp());
            if (!node->isConstructor() && !opString.empty())
            {
                // The return type doesn't affect the mangled name of the function, which is used
                // to look it up from the symbol table.
                TType dummyReturnType;
                TFunction call(&opString, &dummyReturnType, node->getOp());
                for (auto *child : *sequence)
                {
                    TType *paramType = child->getAsTyped()->getTypePointer();
                    TConstParameter p(paramType);
                    call.addParameter(p);
                }

                TSymbol *sym = mSymbolTable.findBuiltIn(call.getMangledName(), mShaderVersion);
                if (sym != nullptr && sym->isFunction())
                {
                    builtInFunc = static_cast<TFunction *>(sym);
                    ASSERT(builtInFunc->getParamCount() == sequence->size());
                }
            }

            size_t paramIndex = 0;

            for (auto *child : *sequence)
            {
                TQualifier qualifier = EvqIn;
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