A pointer type contains only one hany bit of information: the base type
A pointer type contains only one hany bit of information: the base type. can also have a modifier like BIT_CONST BIT_GLOBAL. see SgDescriptType. variant == T_POINTER
SgPointerType(SgType *base_type)
SgType* baseType()
int indirection()
void setIndirection(int)
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