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Code Issues Releases Wiki Activity

added RuleOrConsume

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This commit is contained in:
caheckman 2019-10-29 09:27:42 -04:00
parent 992d32dd87
commit 40d840085f
3 changed files with 40 additions and 0 deletions
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29
Ghidra/Features/Decompiler/src/decompile/cpp/ruleaction.cc
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@ -390,6 +390,35 @@ int4 RuleAndMask::applyOp(PcodeOp *op,Funcdata &data)
return 1;
}
/// \class RuleOrConsume
/// \brief Simply OR with unconsumed input: `V = A | B => V = B if nzm(A) & consume(V) == 0
void RuleOrConsume::getOpList(vector<uint4> &oplist) const
{
oplist.push_back(CPUI_INT_OR);
oplist.push_back(CPUI_INT_XOR);
}
int4 RuleOrConsume::applyOp(PcodeOp *op,Funcdata &data)
{
Varnode *outvn = op->getOut();
int4 size = outvn->getSize();
if (size > sizeof(uintb)) return 0; // FIXME: uintb should be arbitrary precision
uintb consume = outvn->getConsume();
if ((consume & op->getIn(0)->getNZMask()) == 0) {
data.opRemoveInput(op,0);
data.opSetOpcode(op, CPUI_COPY);
return 1;
}
else if ((consume & op->getIn(1)->getNZMask()) == 0) {
data.opRemoveInput(op,1);
data.opSetOpcode(op, CPUI_COPY);
return 1;
}
return 0;
}
/// \class RuleOrCollapse
/// \brief Collapse unnecessary INT_OR
///