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Return null from a static class to interface cast if the class reference was

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null. Fixes #237.
This commit is contained in:
Frits van Bommel
2009-03-20 15:50:01 +01:00
parent e242f81475
commit d0a8ee9573
1 changed files with 10 additions and 2 deletions
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12
gen/classes.cpp
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@@ -1067,13 +1067,21 @@ DValue* DtoCastClass(DValue* val, Type* _to)
IrInterface* iri = iriter->second;
// offset pointer
LLValue* v = val->getRVal();
LLValue* orig = v;
v = DtoGEPi(v, 0, iri->index);
const LLType* ifType = DtoType(_to);
if (Logger::enabled())
{
Logger::cout() << "V = " << *v << std::endl;
Logger::cout() << "T = " << *DtoType(_to) << std::endl;
Logger::cout() << "T = " << *ifType << std::endl;
}
v = DtoBitCast(v, DtoType(_to));
v = DtoBitCast(v, ifType);
// Check whether the original value was null, and return null if so.
// Sure we could have jumped over the code above in this case, but
// it's just a GEP and (maybe) a pointer-to-pointer BitCast, so it
// should be pretty cheap and perfectly safe even if the original was null.
LLValue* isNull = gIR->ir->CreateICmpEQ(orig, LLConstant::getNullValue(orig->getType()), ".nullcheck");
v = gIR->ir->CreateSelect(isNull, LLConstant::getNullValue(ifType), v, ".interface");
// return r-value
return new DImValue(_to, v);
}