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C++ ConstantExpressionPtr::isNull方法代码示例

本文整理汇总了C++中ConstantExpressionPtr::isNull方法的典型用法代码示例。如果您正苦于以下问题：C++ ConstantExpressionPtr::isNull方法的具体用法？C++ ConstantExpressionPtr::isNull怎么用？C++ ConstantExpressionPtr::isNull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ConstantExpressionPtr的用法示例。


在下文中一共展示了ConstantExpressionPtr::isNull方法的4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: outputCPPImpl

void ParameterExpression::outputCPPImpl(CodeGenerator &cg,
                                        AnalysisResultPtr ar) {
  FunctionScopePtr func =
    dynamic_pointer_cast<FunctionScope>(ar->getScope());
  VariableTablePtr variables = func->getVariables();
  TypePtr paramType = func->getParamType(cg.getItemIndex());
  bool isCVarRef = false;
  if (cg.getContext() == CodeGenerator::CppStaticMethodWrapper ||
      (!variables->isLvalParam(m_name) &&
       !variables->getAttribute(VariableTable::ContainsDynamicVariable) &&
       !variables->getAttribute(VariableTable::ContainsExtract) &&
       !m_ref)) {
    if (paramType->is(Type::KindOfVariant) ||
        paramType->is(Type::KindOfSome)) {
      cg_printf("CVarRef");
      isCVarRef = true;
    }
    else if (paramType->is(Type::KindOfArray)) cg_printf("CArrRef");
    else if (paramType->is(Type::KindOfString)) cg_printf("CStrRef");
    else paramType->outputCPPDecl(cg, ar);
  } else {
    paramType->outputCPPDecl(cg, ar);
  }

  cg_printf(" %s%s", Option::VariablePrefix, m_name.c_str());
  if (m_defaultValue) {
    CodeGenerator::Context context = cg.getContext();
    bool comment =  context == CodeGenerator::CppImplementation ||
      (context == CodeGenerator::CppDeclaration && func->isInlined());
    if (comment) {
      cg_printf(" // ");
    }
    cg_printf(" = ");
    ConstantExpressionPtr con =
      dynamic_pointer_cast<ConstantExpression>(m_defaultValue);
    if (isCVarRef && con && con->isNull()) {
      cg_printf("null_variant");
    } else {
      if (comment) {
        cg.setContext(CodeGenerator::CppParameterDefaultValueImpl);
      } else {
        cg.setContext(CodeGenerator::CppParameterDefaultValueDecl);
      }
      m_defaultValue->outputCPP(cg, ar);
      cg.setContext(context);
    }
    if (comment) {
      cg_printf("\n");
    }
  }
}
开发者ID:GunioRobot，项目名称:hiphop-php，代码行数:51，代码来源:parameter_expression.cpp

示例2: outputCPPImpl

void ParameterExpression::outputCPPImpl(CodeGenerator &cg,
                                        AnalysisResultPtr ar) {
  FunctionScopePtr func = getFunctionScope();
  VariableTablePtr variables = func->getVariables();
  Symbol *sym = variables->getSymbol(m_name);
  assert(sym && sym->isParameter());

  bool inHeader = cg.isFileOrClassHeader();
  cg.setFileOrClassHeader(true);
  CodeGenerator::Context context = cg.getContext();
  bool typedWrapper = (context == CodeGenerator::CppTypedParamsWrapperImpl ||
                       context == CodeGenerator::CppTypedParamsWrapperDecl);

  TypePtr paramType =
    typedWrapper && func->getParamTypeSpec(sym->getParameterIndex()) ?
    Type::Variant : func->getParamType(sym->getParameterIndex());
  bool wrapper = typedWrapper ||
    context == CodeGenerator::CppFunctionWrapperImpl ||
    context == CodeGenerator::CppFunctionWrapperDecl;

  bool isCVarRef = false;
  const char *prefix = "";
  if (m_ref) {
    cg_printf("VRefParam");
    if (!wrapper) {
      prefix = "r";
    }
  } else if (wrapper ||
      (!variables->isLvalParam(m_name) &&
       !variables->getAttribute(VariableTable::ContainsDynamicVariable) &&
       !variables->getAttribute(VariableTable::ContainsExtract))) {
    if (paramType->is(Type::KindOfVariant) ||
        paramType->is(Type::KindOfSome)) {
      cg_printf("CVarRef");
      isCVarRef = true;
    }
    else if (paramType->is(Type::KindOfArray))  cg_printf("CArrRef");
    else if (paramType->is(Type::KindOfString)) cg_printf("CStrRef");
    else paramType->outputCPPDecl(cg, ar, getScope());
  } else {
    paramType->outputCPPDecl(cg, ar, getScope());
  }

  cg_printf(" %s%s%s",
            prefix, Option::VariablePrefix,
            CodeGenerator::FormatLabel(m_name).c_str());
  if (m_defaultValue && sym->getParameterIndex() >= func->getMinParamCount()) {
    bool comment = context == CodeGenerator::CppTypedParamsWrapperImpl ||
      context == CodeGenerator::CppFunctionWrapperImpl ||
      context == CodeGenerator::CppImplementation ||
      (context == CodeGenerator::CppDeclaration && func->isInlined());
    if (comment) {
      cg_printf(" // ");
    }
    cg_printf(" = ");
    ConstantExpressionPtr con =
      dynamic_pointer_cast<ConstantExpression>(m_defaultValue);

    bool done = false;
    if (con && con->isNull()) {
      done = true;
      if (isCVarRef) {
        cg_printf("null_variant");
      } else if (paramType->is(Type::KindOfVariant) ||
                 paramType->is(Type::KindOfSome)) {
        cg_printf("null");
      } else if (paramType->is(Type::KindOfObject)) {
        cg_printf("Object()");
      } else if (paramType->is(Type::KindOfArray)) {
        cg_printf("Array()");
      } else if (paramType->is(Type::KindOfString)) {
        cg_printf("String()");
      } else {
        done = false;
      }
    }
    if (!done) {
      if (comment) {
        cg.setContext(CodeGenerator::CppParameterDefaultValueImpl);
      } else {
        cg.setContext(CodeGenerator::CppParameterDefaultValueDecl);
      }
      bool isScalar = m_defaultValue->isScalar();
      if (isCVarRef && isScalar) {
        ASSERT(!cg.hasScalarVariant());
        cg.setScalarVariant();
      }
      m_defaultValue->outputCPP(cg, ar);
      if (isCVarRef && isScalar) cg.clearScalarVariant();
      ASSERT(!cg.hasScalarVariant());
      cg.setContext(context);
    }
    if (comment) {
      cg_printf("\n");
    }
  }
  cg.setFileOrClassHeader(inHeader);
}
开发者ID:hashaash，项目名称:hiphop-php，代码行数:98，代码来源:parameter_expression.cpp

示例3: outputCPPImpl

void AssignmentExpression::outputCPPImpl(CodeGenerator &cg,
                                         AnalysisResultPtr ar) {
  BlockScopePtr scope = ar->getScope();
  bool ref = (m_ref && m_value->isRefable());

  bool setNull = false;
  bool arrayLike = false;

  if (m_variable->is(Expression::KindOfArrayElementExpression)) {
    ArrayElementExpressionPtr exp =
      dynamic_pointer_cast<ArrayElementExpression>(m_variable);
    if (!exp->isSuperGlobal() && !exp->isDynamicGlobal()) {
      exp->getVariable()->outputCPP(cg, ar);
      if (exp->getOffset()) {
        cg_printf(".set(");
        exp->getOffset()->outputCPP(cg, ar);
        cg_printf(", (");
      } else {
        cg_printf(".append((");
      }
      wrapValue(cg, ar, m_value, ref, true);
      cg_printf(")");
      ExpressionPtr off = exp->getOffset();
      if (off) {
        ScalarExpressionPtr sc =
          dynamic_pointer_cast<ScalarExpression>(off);
        if (sc) {
          if (sc->isLiteralString()) {
            String s(sc->getLiteralString());
            int64 n;
            if (!s.get()->isStrictlyInteger(n)) {
              cg_printf(", true"); // skip toKey() at run time
            }
          }
        }
      }
      cg_printf(")");
      return;
    }
  } else if (m_variable->is(Expression::KindOfObjectPropertyExpression)) {
    ObjectPropertyExpressionPtr var(
      dynamic_pointer_cast<ObjectPropertyExpression>(m_variable));
    if (!var->isValid()) {
      var->outputCPPObject(cg, ar);
      cg_printf("o_set(");
      var->outputCPPProperty(cg, ar);
      cg_printf(", %s", ref ? "ref(" : "");
      m_value->outputCPP(cg, ar);
      cg_printf("%s, %s)",
                ref ? ")" : "",
                ar->getClassScope() ? "s_class_name" : "empty_string");
      return;
    }
  } else if (m_variable->is(Expression::KindOfSimpleVariable) &&
      m_value->is(Expression::KindOfConstantExpression)) {
    ConstantExpressionPtr exp =
      dynamic_pointer_cast<ConstantExpression>(m_value);
    if (exp->isNull()) setNull = true;
  }

  bool wrapped = true;
  if (setNull) {
    cg_printf("setNull(");
    m_variable->outputCPP(cg, ar);
  } else {
    if ((wrapped = !isUnused())) {
      cg_printf("(");
    }
    m_variable->outputCPP(cg, ar);
    cg_printf(" = ");

    wrapValue(cg, ar, m_value, ref, arrayLike);
  }
  if (wrapped) {
    cg_printf(")");
  }
}
开发者ID:mukulu，项目名称:hiphop-php，代码行数:77，代码来源:assignment_expression.cpp

示例4: outputCPPImpl

void AssignmentExpression::outputCPPImpl(CodeGenerator &cg,
                                         AnalysisResultPtr ar) {
  BlockScopePtr scope = ar->getScope();
  bool ref = (m_ref && !m_value->is(Expression::KindOfNewObjectExpression));

  bool setElement = false; // turning $a['elem'] = $b into $a.set('elem', $b);
  bool type_cast = false;
  bool setNull = false;
  TypePtr m_actualType;

  if (m_variable->is(Expression::KindOfArrayElementExpression)) {
    ArrayElementExpressionPtr exp =
      dynamic_pointer_cast<ArrayElementExpression>(m_variable);
    m_actualType = m_variable->getActualType();
    if (m_actualType && m_actualType->getKindOf() == Type::KindOfVariant
        && !ref) {
      //type_cast = true;
    }
    if (!exp->isSuperGlobal() && !exp->isDynamicGlobal()) {
      exp->getVariable()->outputCPP(cg, ar);
      if (exp->getOffset()) {
        cg.printf(".set(");
        exp->getOffset()->outputCPP(cg, ar);
        cg.printf(", (");
      } else {
        cg.printf(".append((");
      }
      if (type_cast) {
        m_actualType->outputCPPCast(cg, ar);
        cg.printf("(");
      }
      if (ref && m_value->isRefable()) cg.printf("ref(");
      m_value->outputCPP(cg, ar);
      if (ref && m_value->isRefable()) cg.printf(")");
      if (type_cast) cg.printf(")");
      cg.printf(")");
      ExpressionPtr off = exp->getOffset();
      if (off) {
        ScalarExpressionPtr sc =
          dynamic_pointer_cast<ScalarExpression>(off);
        if (sc) {
          int64 hash = sc->getHash();
          if (hash >= 0) {
            cg.printf(", 0x%016llXLL", hash);
          } else {
            cg.printf(", -1");
          }
          if (sc->isLiteralString()) {
            String s(sc->getLiteralString());
            int64 n;
            if (!s.get()->isStrictlyInteger(n)) {
              cg.printf(", true"); // skip toKey() at run time
            }
          }
        }
      }
      cg.printf(")");
      setElement = true;
    }
  }
  if (m_variable->is(Expression::KindOfSimpleVariable) &&
      m_value->is(Expression::KindOfConstantExpression)) {
    ConstantExpressionPtr exp =
      dynamic_pointer_cast<ConstantExpression>(m_value);
    if (exp->isNull()) setNull = true;
  }

  if (!setElement) {
    if (setNull) {
      cg.printf("setNull(");
      m_variable->outputCPP(cg, ar);
    } else {
      cg.printf("(");
      m_variable->outputCPP(cg, ar);
      cg.printf(" = ");

      if (type_cast) {
        m_actualType->outputCPPCast(cg, ar);
        cg.printf("(");
      }
      if (ref && m_value->isRefable()) cg.printf("ref(");
      m_value->outputCPP(cg, ar);
      if (ref && m_value->isRefable()) cg.printf(")");
      if (type_cast) cg.printf(")");
    }
    cg.printf(")");
  }
}
开发者ID:scottmac，项目名称:hiphop-dev，代码行数:88，代码来源:assignment_expression.cpp


注：本文中的ConstantExpressionPtr::isNull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。