C++ ExpressionPtr::getImplementedType方法代码示例

static void outputStringExpr(CodeGenerator &cg, AnalysisResultPtr ar,
                             ExpressionPtr exp, bool asLitStr) {
  if (asLitStr && exp->isLiteralString()) {
    const std::string &s = exp->getLiteralString();
    char *enc = string_cplus_escape(s.c_str(), s.size());
    cg_printf("\"%s\", %d", enc, s.size());
    free(enc);
    return;
  }

  bool close = false;
  if ((exp->hasContext(Expression::LValue) &&
       (!exp->getActualType()->is(Type::KindOfString) ||
        (exp->getImplementedType() &&
         !exp->getImplementedType()->is(Type::KindOfString))))
      ||
      !exp->getType()->is(Type::KindOfString)) {
    cg_printf("toString(");
    close = true;
  }
  exp->outputCPP(cg, ar);
  if (close) cg_printf(")");
}

void UnaryOpExpression::SetExpTypeForExistsContext(AnalysisResultPtr ar,
                                                   ExpressionPtr e,
                                                   bool allowPrimitives) {
  if (!e) return;
  TypePtr at(e->getActualType());
  if (!allowPrimitives && at &&
      at->isExactType() && at->isPrimitive()) {
    at = e->inferAndCheck(ar, Type::Variant, true);
  }
  TypePtr it(e->getImplementedType());
  TypePtr et(e->getExpectedType());
  if (et && et->is(Type::KindOfVoid)) e->setExpectedType(TypePtr());
  if (at && (!it || Type::IsMappedToVariant(it)) &&
      ((allowPrimitives && Type::HasFastCastMethod(at)) ||
       (!allowPrimitives &&
        (at->is(Type::KindOfObject) ||
         at->is(Type::KindOfArray) ||
         at->is(Type::KindOfString))))) {
    e->setExpectedType(it ? at : TypePtr());
  }
}

static bool checkCopyElision(FunctionScopePtr func, ExpressionPtr exp) {
  if (!exp->getType()->is(Type::KindOfVariant) || func->isRefReturn()) {
    return false;
  }

  TypePtr imp = exp->getImplementedType();
  if (!imp) imp = exp->getActualType();
  if (!imp || !imp->is(Type::KindOfVariant)) return false;

  if (func->getNRVOFix() && exp->is(Expression::KindOfSimpleVariable)) {
    return true;
  }

  if (FunctionCallPtr fc = dynamic_pointer_cast<FunctionCall>(exp)) {
    FunctionScopePtr fs = fc->getFuncScope();
    if (!fs || fs->isRefReturn()) {
      return true;
    }
  }

  return false;
}

//.........这里部分代码省略.........
        Compiler::Error(Compiler::TooManyArgument, exp, m_stmt);
      }
      valid = false;
      if (!Option::AllDynamic) setDynamic();
    }
  }

  bool canSetParamType = isUserFunction() && !m_overriding && !m_perfectVirtual;
  for (int i = 0; i < params->getCount(); i++) {
    ExpressionPtr param = (*params)[i];
    if (i < m_maxParam && param->hasContext(Expression::RefParameter)) {
      /**
       * This should be very un-likely, since call time pass by ref is a
       * deprecated, not very widely used (at least in FB codebase) feature.
       */
      TRY_LOCK_THIS();
      Symbol *sym = getVariables()->addSymbol(m_paramNames[i]);
      sym->setLvalParam();
      sym->setCallTimeRef();
    }
    if (valid && param->hasContext(Expression::InvokeArgument)) {
      param->clearContext(Expression::InvokeArgument);
      param->clearContext(Expression::RefValue);
      param->clearContext(Expression::NoRefWrapper);
    }
    bool isRefVararg = (i >= m_maxParam && isReferenceVariableArgument());
    if ((i < m_maxParam && isRefParam(i)) || isRefVararg) {
      param->setContext(Expression::LValue);
      param->setContext(Expression::RefValue);
      param->inferAndCheck(ar, Type::Variant, true);
    } else if (!(param->getContext() & Expression::RefParameter)) {
      param->clearContext(Expression::LValue);
      param->clearContext(Expression::RefValue);
      param->clearContext(Expression::InvokeArgument);
      param->clearContext(Expression::NoRefWrapper);
    }
    TypePtr expType;
    /**
     * Duplicate the logic of getParamType(i), w/o the mutation
     */
    TypePtr paramType(i < m_maxParam && !isZendParamMode() ?
                      m_paramTypes[i] : TypePtr());
    if (!paramType) paramType = Type::Some;
    if (valid && !canSetParamType && i < m_maxParam &&
        (!Option::HardTypeHints || !m_paramTypeSpecs[i])) {
      /**
       * What is this magic, you might ask?
       *
       * Here, we take advantage of implicit conversion from every type to
       * Variant. Essentially, we don't really care what type comes out of this
       * expression since it'll just get converted anyways. Doing it this way
       * allows us to generate less temporaries along the way.
       */
      TypePtr optParamType(paramType->is(Type::KindOfVariant) ?
                           Type::Some : paramType);
      expType = param->inferAndCheck(ar, optParamType, false);
    } else {
      expType = param->inferAndCheck(ar, Type::Some, false);
    }
    if (i < m_maxParam) {
      if (!Option::HardTypeHints || !m_paramTypeSpecs[i]) {
        if (canSetParamType) {
          if (!Type::SameType(paramType, expType) &&
              !paramType->is(Type::KindOfVariant)) {
            TRY_LOCK_THIS();
            paramType = setParamType(ar, i, expType);
          } else {
            // do nothing - how is this safe?  well, if we ever observe
            // paramType == expType, then this means at some point in the past,
            // somebody called setParamType() with expType.  thus, by calling
            // setParamType() again with expType, we contribute no "new"
            // information. this argument also still applies in the face of
            // concurrency
          }
        }
        // See note above. If we have an implemented type, however, we
        // should set the paramType to the implemented type to avoid an
        // un-necessary cast
        if (paramType->is(Type::KindOfVariant)) {
          TypePtr it(param->getImplementedType());
          paramType = it ? it : expType;
        }
        if (valid) {
          if (!Type::IsLegalCast(ar, expType, paramType) &&
              paramType->isNonConvertibleType()) {
            param->inferAndCheck(ar, paramType, true);
          }
          param->setExpectedType(paramType);
        }
      }
    }
    // we do a best-effort check for bad pass-by-reference and do not report
    // error for some vararg case (e.g., array_multisort can have either ref
    // or value for the same vararg).
    if (!isRefVararg || !isMixedVariableArgument()) {
      Expression::CheckPassByReference(ar, param);
    }
  }
  return ret;
}