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emitbinaryoperatorlvalue
2014 Dec 15
4
[LLVMdev] ubsan - active member check for unions
...s[42];
double d;
};
};
void f() {
S s;
s.d = 42.0;
if (s.l > 100) // fire here
;
}
My current implementation is naïve (also possibly wrong), and doesn't
care about "special guarantee" that allows inspecting common initial
sequence. Briefly;
1. in EmitBinaryOperatorLValue, if we are storing value of a union
member, we call a ubsan runtime function (not a handler) that maps
pointer value (of the union) to a tuple/struct (of TypeDescr, active
field index, expression location that has changed the active member,
and array of field names)
2. When a union member is being...