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GP-5240 Simplify late expressions where a SUBPIECE is taken of a PIECE

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This commit is contained in:
caheckman 2025-01-06 21:51:28 +00:00
parent acf5ac688a
commit 53d8d182e3
15 changed files with 215 additions and 88 deletions
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25
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_op.cc
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@ -221,6 +221,31 @@ void Funcdata::opDestroy(PcodeOp *op)
}
}
/// The given PcodeOp is always removed. PcodeOps are recursively removed, if the only data-flow
/// path of their output is to the given op, and they are not a CALL or are otherwise special.
/// \param op is the given PcodeOp to remove
/// \param scratch is scratch space for holding PcodeOps being examined
void Funcdata::opDestroyRecursive(PcodeOp *op,vector<PcodeOp *> &scratch)
{
scratch.clear();
scratch.push_back(op);
int4 pos = 0;
while(pos < scratch.size()) {
op = scratch[pos];
pos += 1;
for(int4 i=0;i<op->numInput();++i) {
Varnode *vn = op->getIn(i);
if (!vn->isWritten() || vn->isAutoLive()) continue;
if (vn->loneDescend() == (PcodeOp *)0) continue;
PcodeOp *defOp = vn->getDef();
if (defOp->isCall() || defOp->isIndirectSource()) continue;
scratch.push_back(defOp);
}
opDestroy(op);
}
}
/// This is a specialized routine for deleting an op during flow generation that has
/// been replaced by something else. The op is expected to be \e dead with none of its inputs
/// or outputs linked to anything else. Both the PcodeOp and all the input/output Varnodes are destroyed.