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Fix combinatorial explosion in ancestorOpUse

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This commit is contained in:
caheckman 2020-10-07 15:27:13 -04:00
parent e7b63fdab5
commit e8b7a61197
1 changed files with 11 additions and 4 deletions
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15
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_varnode.cc
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@ -1584,13 +1584,20 @@ bool Funcdata::ancestorOpUse(int4 maxlevel,const Varnode *invn,
// as an "only use"
if (def->isIndirectCreation())
return false;
// fallthru
return ancestorOpUse(maxlevel-1,def->getIn(0),op,trial);
case CPUI_MULTIEQUAL:
// Check if there is any ancestor whose only
// use is in this op
for(i=0;i<def->numInput();++i)
if (ancestorOpUse(maxlevel-1,def->getIn(i),op,trial)) return true;
if (def->isMark()) return false; // Trim the loop
def->setMark(); // Mark that this MULTIEQUAL is on the path
// Note: onlyOpUse is using Varnode::setMark
for(i=0;i<def->numInput();++i) {
if (ancestorOpUse(maxlevel-1,def->getIn(i),op,trial)) {
def->clearMark();
return true;
}
}
def->clearMark();
return false;
case CPUI_COPY:
if ((invn->getSpace()->getType()==IPTR_INTERNAL)||def->isIncidentalCopy()||def->getIn(0)->isIncidentalCopy()) {