C++ TSymbol::isFunction方法代码示例

bool ValidateLimitations::validateFunctionCall(TIntermAggregate *node)
{
    ASSERT(node->getOp() == EOpFunctionCall);

    // If not within loop body, there is nothing to check.
    if (!withinLoopBody())
        return true;

    // List of param indices for which loop indices are used as argument.
    typedef std::vector<size_t> ParamIndex;
    ParamIndex pIndex;
    TIntermSequence *params = node->getSequence();
    for (TIntermSequence::size_type i = 0; i < params->size(); ++i)
    {
        TIntermSymbol *symbol = (*params)[i]->getAsSymbolNode();
        if (symbol && isLoopIndex(symbol))
            pIndex.push_back(i);
    }
    // If none of the loop indices are used as arguments,
    // there is nothing to check.
    if (pIndex.empty())
        return true;

    bool valid = true;
    TSymbolTable& symbolTable = GetGlobalParseContext()->symbolTable;
    TSymbol *symbol           = symbolTable.find(node->getFunctionSymbolInfo()->getName(),
                                       GetGlobalParseContext()->getShaderVersion());
    ASSERT(symbol && symbol->isFunction());
    TFunction *function = static_cast<TFunction *>(symbol);
    for (ParamIndex::const_iterator i = pIndex.begin();
         i != pIndex.end(); ++i)
    {
        const TConstParameter &param = function->getParam(*i);
        TQualifier qual = param.type->getQualifier();
        if ((qual == EvqOut) || (qual == EvqInOut))
        {
            error((*params)[*i]->getLine(),
                  "Loop index cannot be used as argument to a function out or inout parameter",
                  (*params)[*i]->getAsSymbolNode()->getSymbol().c_str());
            valid = false;
        }
    }

    return valid;
}

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

    TIntermSequence *sequence = node->getSequence();
    if (node->getOp() == EOpPrototype)
    {
        addToFunctionMap(node->getFunctionSymbolInfo()->getNameObj(), sequence);
    }

    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
        {
            // 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;
                if (builtInFunc != nullptr)
                    qualifier = builtInFunc->getParam(paramIndex).type->getQualifier();
                setInFunctionCallOutParameter(qualifier == EvqOut || qualifier == EvqInOut);
                child->traverse(this);

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

                ++paramIndex;
            }

            setInFunctionCallOutParameter(false);
        }

//.........这里部分代码省略.........