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PTRADD adjustments post ActionRestructureHigh

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This commit is contained in:
caheckman 2019-11-01 16:02:36 -04:00
parent cfc1177ac1
commit 9a3ab38631
4 changed files with 50 additions and 21 deletions
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36
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_op.cc
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@ -521,6 +521,42 @@ Varnode *Funcdata::opStackLoad(AddrSpace *spc,uintb off,uint4 sz,PcodeOp *op,Var
return res;
}
/// Convert the given CPUI_PTRADD into the equivalent CPUI_INT_ADD. This may involve inserting a
/// CPUI_INT_MULT PcodeOp. If finalization is requested and a new PcodeOp is needed, the output
/// Varnode is marked as \e implicit and has its data-type set
/// \param op is the given PTRADD
void Funcdata::opUndoPtradd(PcodeOp *op,bool finalize)
{
Varnode *multVn = op->getIn(2);
int4 multSize = multVn->getOffset(); // Size the PTRADD thinks we are pointing
opRemoveInput(op,2);
opSetOpcode(op,CPUI_INT_ADD);
if (multSize == 1) return; // If no multiplier, we are done
Varnode *offVn = op->getIn(1);
if (offVn->isConstant()) {
uintb newVal = multSize * offVn->getOffset();
newVal &= calc_mask(offVn->getSize());
Varnode *newOffVn = newConstant(offVn->getSize(), newVal);
if (finalize)
newOffVn->updateType(offVn->getType(), false, false);
opSetInput(op,newOffVn,1);
return;
}
PcodeOp *multOp = newOp(2,op->getAddr());
opSetOpcode(multOp,CPUI_INT_MULT);
Varnode *addVn = newUniqueOut(offVn->getSize(),multOp);
if (finalize) {
addVn->updateType(multVn->getType(), false, false);
addVn->setImplied();
}
opSetInput(multOp,offVn,0);
opSetInput(multOp,multVn,1);
opSetInput(op,addVn,1);
opInsertBefore(multOp,op);
}
/// Make a clone of the given PcodeOp, copying control-flow properties as well. The data-type
/// is \e not cloned.
/// \param op is the PcodeOp to clone