本文整理汇总了C++中ConstraintInfo::isReadWrite方法的典型用法代码示例。如果您正苦于以下问题：C++ ConstraintInfo::isReadWrite方法的具体用法？C++ ConstraintInfo::isReadWrite怎么用？C++ ConstraintInfo::isReadWrite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ConstraintInfo的用法示例。
在下文中一共展示了ConstraintInfo::isReadWrite方法的1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: validateOutputConstraint
bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const {
const char *Name = Info.getConstraintStr().c_str();
// An output constraint must start with '=' or '+'
if (*Name != '=' && *Name != '+')
return false;
if (*Name == '+')
Info.setIsReadWrite();
Name++;
while (*Name) {
switch (*Name) {
default:
if (!validateAsmConstraint(Name, Info)) {
// FIXME: We temporarily return false
// so we can add more constraints as we hit it.
// Eventually, an unknown constraint should just be treated as 'g'.
return false;
}
break;
case '&': // early clobber.
Info.setEarlyClobber();
break;
case '%': // commutative.
// FIXME: Check that there is a another register after this one.
break;
case 'r': // general register.
Info.setAllowsRegister();
break;
case 'm': // memory operand.
case 'o': // offsetable memory operand.
case 'V': // non-offsetable memory operand.
case '<': // autodecrement memory operand.
case '>': // autoincrement memory operand.
Info.setAllowsMemory();
break;
case 'g': // general register, memory operand or immediate integer.
case 'X': // any operand.
Info.setAllowsRegister();
Info.setAllowsMemory();
break;
case ',': // multiple alternative constraint. Pass it.
// Handle additional optional '=' or '+' modifiers.
if (Name[1] == '=' || Name[1] == '+')
Name++;
break;
case '#': // Ignore as constraint.
while (Name[1] && Name[1] != ',')
Name++;
break;
case '?': // Disparage slightly code.
case '!': // Disparage severely.
case '*': // Ignore for choosing register preferences.
break; // Pass them.
}
Name++;
}
// Early clobber with a read-write constraint which doesn't permit registers
// is invalid.
if (Info.earlyClobber() && Info.isReadWrite() && !Info.allowsRegister())
return false;
// If a constraint allows neither memory nor register operands it contains
// only modifiers. Reject it.
return Info.allowsMemory() || Info.allowsRegister();
}