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Code Issues Releases Wiki Activity

Extending incidental copy

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This commit is contained in:
caheckman 2019-11-26 11:53:43 -05:00
parent 4fc507f711
commit 00ac31c788
8 changed files with 39 additions and 12 deletions
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16
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_varnode.cc
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@ -1341,13 +1341,7 @@ bool Funcdata::ancestorOpUse(int4 maxlevel,const Varnode *invn,
return false;
case CPUI_COPY:
if ((invn->getSpace()->getType()==IPTR_INTERNAL)||(invn->isAddrForce())) {
// Bit of a kludge to take into account
// uniq <- LOAD uniq=stackX
// <->
// call( uniq ) call( uniq )
//
// We follow copys into uniques
if ((invn->getSpace()->getType()==IPTR_INTERNAL)||def->isIncidentalCopy()||def->getIn(0)->isIncidentalCopy()) {
if (!ancestorOpUse(maxlevel-1,def->getIn(0),op,trial)) return false;
return true;
}
@ -1442,7 +1436,8 @@ int4 AncestorRealistic::enterNode(State &state)
case CPUI_SUBPIECE:
// Extracting to a temporary, or to the same storage location, or otherwise incidental
// are viewed as just another node on the path to traverse
if (op->getOut()->getSpace()->getType()==IPTR_INTERNAL||op->getIn(0)->isIncidentalCopy()
if (op->getOut()->getSpace()->getType()==IPTR_INTERNAL
|| op->isIncidentalCopy() || op->getIn(0)->isIncidentalCopy()
|| (op->getOut()->overlap(*op->getIn(0)) == (int4)op->getIn(1)->getOffset())) {
stateStack.push_back(State(op,0));
return enter_node; // Push into the new node
@ -1461,7 +1456,8 @@ int4 AncestorRealistic::enterNode(State &state)
case CPUI_COPY:
// Copies to a temporary, or between varnodes with same storage location, or otherwise incidental
// are viewed as just another node on the path to traverse
if (op->getOut()->getSpace()->getType()==IPTR_INTERNAL||op->getIn(0)->isIncidentalCopy()
if (op->getOut()->getSpace()->getType()==IPTR_INTERNAL
|| op->isIncidentalCopy() || op->getIn(0)->isIncidentalCopy()
|| (op->getOut()->getAddr() == op->getIn(0)->getAddr())) {
stateStack.push_back(State(op,0));
return enter_node; // Push into the new node
@ -1471,7 +1467,7 @@ int4 AncestorRealistic::enterNode(State &state)
do {
Varnode *vn = op->getIn(0);
if ((!vn->isMark())&&(vn->isInput())) {
if (vn->isUnaffected()||(!vn->isDirectWrite()))
if (!vn->isDirectWrite())
return pop_fail;
}
op = vn->getDef();