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

本文整理汇总了C++中ExpressionPtr::isLiteralNull方法的典型用法代码示例。如果您正苦于以下问题：C++ ExpressionPtr::isLiteralNull方法的具体用法？C++ ExpressionPtr::isLiteralNull怎么用？C++ ExpressionPtr::isLiteralNull使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ExpressionPtr的用法示例。

在下文中一共展示了ExpressionPtr::isLiteralNull方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: getCtorAndInitInfo

void ClassVariable::getCtorAndInitInfo(
    ExpressionPtr exp,
    bool &needsCppCtor,
    bool &needsInit,
    SimpleVariablePtr &var,
    TypePtr &type,
    Symbol *&sym,
    ExpressionPtr &value) {

  ClassScopePtr scope = getClassScope();
  bool derivFromRedec = scope->derivesFromRedeclaring() &&
    !m_modifiers->isPrivate();
  AssignmentExpressionPtr assignment;
  bool isAssign = exp->is(Expression::KindOfAssignmentExpression);
  if (isAssign) {
    assignment = static_pointer_cast<AssignmentExpression>(exp);
    var = dynamic_pointer_cast<SimpleVariable>(assignment->getVariable());
    ASSERT(var);
    value = assignment->getValue();
    ASSERT(value);
  } else {
    var = dynamic_pointer_cast<SimpleVariable>(exp);
    ASSERT(var);
  }
  sym = scope->getVariables()->getSymbol(var->getName());
  ASSERT(sym);
  type = scope->getVariables()->getFinalType(var->getName());
  ASSERT(type);

  bool isValueNull = isAssign ? value->isLiteralNull() : false;
  bool typeIsInitable = type->is(Type::KindOfVariant) ||
                        type->getCPPInitializer();
  if (!derivFromRedec &&
      !sym->isOverride() &&
      (isAssign ?
        (isValueNull ||
         (value->is(Expression::KindOfScalarExpression) &&
          type->isPrimitive())) :
        typeIsInitable)) {
    needsCppCtor = true;
  } else if (isAssign || typeIsInitable) {
    // if we aren't an assignment and the type is not a variant
    // w/ no CPP initializer, then we currently don't bother
    // to initialize it in init().
    needsInit = true;
  }
}

开发者ID:ArPharazon，项目名称:hiphop-php，代码行数:47，代码来源:class_variable.cpp

示例2: outputCPPImpl

void ClassVariable::outputCPPImpl(CodeGenerator &cg, AnalysisResultPtr ar) {

  // bail out early if possible
  switch (cg.getContext()) {
  case CodeGenerator::CppConstructor:
  case CodeGenerator::CppInitializer:
    if (m_modifiers->isStatic()) return;
    break;
  default:
    return;
  }

  ClassScopePtr scope = getClassScope();
  bool derivFromRedec = scope->derivesFromRedeclaring() &&
    !m_modifiers->isPrivate();

  for (int i = 0; i < m_declaration->getCount(); i++) {
    ExpressionPtr exp = (*m_declaration)[i];
    SimpleVariablePtr var;
    TypePtr type;
    Symbol *sym;
    ExpressionPtr value;

    bool initInCtor = false;
    bool initInInit = false;
    getCtorAndInitInfo(exp, initInCtor, initInInit, var, type, sym, value);

    bool isAssign = exp->is(Expression::KindOfAssignmentExpression);
    bool isValueNull = isAssign ? value->isLiteralNull() : false;

    switch (cg.getContext()) {
    case CodeGenerator::CppConstructor:
      if (initInCtor) {
        if (!cg.hasInitListFirstElem()) {
          cg.setInitListFirstElem();
        } else {
          cg_printf(", ");
        }
        if (isAssign) {
          if (isValueNull) {
            cg_printf("%s%s(Variant::nullInit)",
                      Option::PropertyPrefix,
                      var->getName().c_str());
          } else {
            ASSERT(value);
            ASSERT(value->is(Expression::KindOfScalarExpression));
            cg_printf("%s%s(",
                      Option::PropertyPrefix,
                      var->getName().c_str());
            value->outputCPP(cg, ar);
            cg_printf(")");
          }
        } else {
          if (type->is(Type::KindOfVariant)) {
            cg_printf("%s%s(Variant::nullInit)",
                      Option::PropertyPrefix,
                      var->getName().c_str());
          } else {
            const char *initializer = type->getCPPInitializer();
            ASSERT(initializer);
            cg_printf("%s%s(%s)",
                      Option::PropertyPrefix,
                      var->getName().c_str(),
                      initializer);
          }
        }
      }
      break;
    case CodeGenerator::CppInitializer:
      if (initInInit) {
        if (isAssign) {
          value->outputCPPBegin(cg, ar);
          if (derivFromRedec) {
            cg_printf("%sset(", Option::ObjectPrefix);
            cg_printString(var->getName(), ar, shared_from_this());
            cg_printf(", ");
            value->outputCPP(cg, ar);
            cg_printf(")");
          } else if (isValueNull) {
            cg_printf("setNull(%s%s)", Option::PropertyPrefix,
                      var->getName().c_str());
          } else {
            cg_printf("%s%s = ", Option::PropertyPrefix, var->getName().c_str());
            value->outputCPP(cg, ar);
          }
          cg_printf(";\n");
          value->outputCPPEnd(cg, ar);
        } else {
          if (derivFromRedec) {
            cg_printf("%sset(", Option::ObjectPrefix);
            cg_printString(var->getName(), ar, shared_from_this());
            cg_printf(", null_variant);\n");
          } else {
            if (type->is(Type::KindOfVariant)) {
              cg_printf("setNull(%s%s);\n", Option::PropertyPrefix,
                        var->getName().c_str());
            } else {
              const char *initializer = type->getCPPInitializer();
              ASSERT(initializer);
              cg_printf("%s%s = %s;\n", Option::PropertyPrefix,
//.........这里部分代码省略.........

开发者ID:ArPharazon，项目名称:hiphop-php，代码行数:101，代码来源:class_variable.cpp

示例3: outputCPPImpl

void ClassVariable::outputCPPImpl(CodeGenerator &cg, AnalysisResultPtr ar) {
  ClassScopePtr scope = getClassScope();
  bool derivFromRedec = scope->derivesFromRedeclaring() &&
    !m_modifiers->isPrivate();
  for (int i = 0; i < m_declaration->getCount(); i++) {
    ExpressionPtr exp = (*m_declaration)[i];

    SimpleVariablePtr var;
    TypePtr type;

    switch (cg.getContext()) {
    case CodeGenerator::CppConstructor:
      if (m_modifiers->isStatic()) continue;

      if (exp->is(Expression::KindOfAssignmentExpression)) {
        AssignmentExpressionPtr assignment =
          dynamic_pointer_cast<AssignmentExpression>(exp);

        var = dynamic_pointer_cast<SimpleVariable>(assignment->getVariable());
        ExpressionPtr value = assignment->getValue();
        value->outputCPPBegin(cg, ar);
        if (derivFromRedec) {
          cg_printf("%sset(", Option::ObjectPrefix);
          cg_printString(var->getName(), ar, shared_from_this());
          cg_printf(", ");
          value->outputCPP(cg, ar);
          cg_printf(")");
        } else if (value->isLiteralNull()) {
          cg_printf("setNull(%s%s)", Option::PropertyPrefix,
                    var->getName().c_str());
        } else {
          cg_printf("%s%s = ", Option::PropertyPrefix, var->getName().c_str());
          value->outputCPP(cg, ar);
        }
        cg_printf(";\n");
        value->outputCPPEnd(cg, ar);
      } else {
        var = dynamic_pointer_cast<SimpleVariable>(exp);
        if (derivFromRedec) {
          cg_printf("%sset(", Option::ObjectPrefix);
          cg_printString(var->getName(), ar, shared_from_this());
          cg_printf(", null_variant);\n");
        } else {
          type = scope->getVariables()->getFinalType(var->getName());
          if (type->is(Type::KindOfVariant)) {
            cg_printf("setNull(%s%s);\n", Option::PropertyPrefix,
                      var->getName().c_str());
          } else {
            const char *initializer = type->is(Type::KindOfVariant) ? "null" :
              type->getCPPInitializer();
            if (initializer) {
              cg_printf("%s%s = %s;\n", Option::PropertyPrefix,
                        var->getName().c_str(), initializer);
            }
          }
        }
      }
      break;

    case CodeGenerator::CppStaticInitializer:
      {
        if (!m_modifiers->isStatic()) continue;

        VariableTablePtr variables = scope->getVariables();
        if (exp->is(Expression::KindOfAssignmentExpression)) {
          AssignmentExpressionPtr assignment =
            dynamic_pointer_cast<AssignmentExpression>(exp);

          var = dynamic_pointer_cast<SimpleVariable>
            (assignment->getVariable());
          ExpressionPtr value = assignment->getValue();
          if (value->containsDynamicConstant(ar)) continue;
          Symbol *sym = scope->getVariables()->getSymbol(var->getName());
          if (sym->isOverride()) continue;
          if (value->isLiteralNull()) {
            cg_printf("setNull(g->%s%s%s%s)",
                      Option::StaticPropertyPrefix, scope->getId(cg).c_str(),
                      Option::IdPrefix.c_str(), var->getName().c_str());
          } else {
            cg_printf("g->%s%s%s%s = ",
                      Option::StaticPropertyPrefix, scope->getId(cg).c_str(),
                      Option::IdPrefix.c_str(), var->getName().c_str());
            value->outputCPP(cg, ar);
          }
        } else {
          var = dynamic_pointer_cast<SimpleVariable>(exp);
          type = scope->getVariables()->getFinalType(var->getName());
          const char *initializer = type->getCPPInitializer();
          if (initializer) {
            cg_printf("g->%s%s%s%s = %s",
                      Option::StaticPropertyPrefix, scope->getId(cg).c_str(),
                      Option::IdPrefix.c_str(), var->getName().c_str(),
                      initializer);
          }
        }
        cg_printf(";\n");
      }
      break;
    case CodeGenerator::CppLazyStaticInitializer:
      {
//.........这里部分代码省略.........

开发者ID:HyeongKyu，项目名称:hiphop-php，代码行数:101，代码来源:class_variable.cpp

注：本文中的ExpressionPtr::isLiteralNull方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。