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don't report invalid derivations

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This commit is contained in:
David Rose 2001-06-06 15:14:46 +00:00
parent 7782d86901
commit 21ff872027
1 changed files with 42 additions and 37 deletions
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79
dtool/src/interrogate/interrogateBuilder.cxx
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@ -2040,47 +2040,52 @@ define_struct_type(InterrogateType &itype, CPPStructType *cpptype,
CPPType *base_type = TypeManager::resolve_type(base._base, scope);
TypeIndex base_index = get_type(base_type, true);
InterrogateType::Derivation d;
d._flags = 0;
d._base = base_index;
d._upcast = 0;
d._downcast = 0;
// Do we need to synthesize upcast and downcast functions?
bool generate_casts = false;
if (base._is_virtual) {
// We do in the presence of virtual inheritance.
generate_casts = true;
} else if (bi != cpptype->_derivation.begin()) {
// Or if we're not talking about the leftmost fork of multiple
// inheritance.
generate_casts = true;
} else if (cpptype->_derivation.size() != 1 &&
left_inheritance_requires_upcast) {
// Or even if we are the leftmost fork of multiple
// inheritance, if the flag is set indicating that this
// requires a pointer change. (For most compilers, this does
// not require a pointer change.)
generate_casts = true;
}
if (generate_casts) {
d._upcast = get_cast_function(base_type, cpptype, "upcast");
d._flags |= InterrogateType::DF_upcast;
if (base_index == 0) {
nout << *cpptype << " reports a derivation from an invalid type.\n";
} else {
InterrogateType::Derivation d;
d._flags = 0;
d._base = base_index;
d._upcast = 0;
d._downcast = 0;
// Do we need to synthesize upcast and downcast functions?
bool generate_casts = false;
if (base._is_virtual) {
// If this is a virtual inheritance, we can't write a
// downcast.
d._flags |= InterrogateType::DF_downcast_impossible;
} else {
d._downcast = get_cast_function(cpptype, base_type, "downcast");
d._flags |= InterrogateType::DF_downcast;
// We do in the presence of virtual inheritance.
generate_casts = true;
} else if (bi != cpptype->_derivation.begin()) {
// Or if we're not talking about the leftmost fork of multiple
// inheritance.
generate_casts = true;
} else if (cpptype->_derivation.size() != 1 &&
left_inheritance_requires_upcast) {
// Or even if we are the leftmost fork of multiple
// inheritance, if the flag is set indicating that this
// requires a pointer change. (For most compilers, this does
// not require a pointer change.)
generate_casts = true;
}
if (generate_casts) {
d._upcast = get_cast_function(base_type, cpptype, "upcast");
d._flags |= InterrogateType::DF_upcast;
if (base._is_virtual) {
// If this is a virtual inheritance, we can't write a
// downcast.
d._flags |= InterrogateType::DF_downcast_impossible;
} else {
d._downcast = get_cast_function(cpptype, base_type, "downcast");
d._flags |= InterrogateType::DF_downcast;
}
}
}
itype._derivations.push_back(d);
itype._derivations.push_back(d);
}
}
}