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Data-type propagation across RETURN ops

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This commit is contained in:
caheckman 2020-02-10 11:27:33 -05:00
parent 37cc39eaa3
commit 99367e1139
5 changed files with 81 additions and 26 deletions
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27
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_op.cc
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@ -577,37 +577,20 @@ PcodeOp *Funcdata::cloneOp(const PcodeOp *op,const SeqNum &seq)
return newop;
}
/// Return the CPUI_RETURN op with the most specialized data-type, which is not
/// dead and is not a special halt. If HighVariables are not available, just
/// return the first CPUI_RETURN op.
/// \return the representative CPUI_RETURN op or NULL
PcodeOp *Funcdata::canonicalReturnOp(void) const
/// Return the first CPUI_RETURN operation that is not dead or an artificial halt
/// \return a representative CPUI_RETURN op or NULL if there are none
PcodeOp *Funcdata::getFirstReturnOp(void) const
{
bool hasnohigh = !isHighOn();
PcodeOp *res = (PcodeOp *)0;
Datatype *bestdt = (Datatype *)0;
list<PcodeOp *>::const_iterator iter,iterend;
iterend = endOp(CPUI_RETURN);
for(iter=beginOp(CPUI_RETURN);iter!=iterend;++iter) {
PcodeOp *retop = *iter;
if (retop->isDead()) continue;
if (retop->getHaltType()!=0) continue;
if (retop->numInput() > 1) {
if (hasnohigh) return retop;
Varnode *vn = retop->getIn(1);
Datatype *ct = vn->getHigh()->getType();
if (bestdt == (Datatype *)0) {
res = retop;
bestdt = ct;
}
else if (ct->typeOrder(*bestdt) < 0) {
res = retop;
bestdt = ct;
}
}
return retop;
}
return res;
return (PcodeOp *)0;
}
/// \brief Create new PcodeOp with 2 or 3 given operands