gecko/xpcom/analysis/must-override.js

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/*
* Detect classes that should have overridden members of their parent
* classes but didn't.
*
* Example:
*
* struct S {
* virtual NS_MUST_OVERRIDE void f();
* virtual void g();
* };
*
* struct A : S { virtual void f(); }; // ok
* struct B : S { virtual NS_MUST_OVERRIDE void f(); }; // also ok
*
* struct C : S { virtual void g(); }; // ERROR: must override f()
* struct D : S { virtual void f(int); }; // ERROR: different overload
* struct E : A { }; // ok: A's definition of f() is good for subclasses
* struct F : B { }; // ERROR: B's definition of f() is still must-override
*
* We don't care if you define the method or not.
*/
function get_must_overrides(cls)
{
let mos = {};
for each (let base in cls.bases)
for each (let m in base.type.members)
if (hasAttribute(m, 'NS_must_override'))
mos[m.shortName] = m;
return mos;
}
function process_type(t)
{
if (t.isIncomplete || (t.kind != 'class' && t.kind != 'struct'))
return;
let mos = get_must_overrides(t);
for each (let m in t.members) {
let mos_m = mos[m.shortName]
if (mos_m && signaturesMatch(mos_m, m))
delete mos[m.shortName];
}
for each (let u in mos)
error(t.kind + " " + t.name + " must override " + u.name, t.loc);
}