diff options
Diffstat (limited to 'utils/TableGen/FileParser.y')
-rw-r--r-- | utils/TableGen/FileParser.y | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/utils/TableGen/FileParser.y b/utils/TableGen/FileParser.y index af8d3d4ff2..d0f88c30c0 100644 --- a/utils/TableGen/FileParser.y +++ b/utils/TableGen/FileParser.y @@ -68,13 +68,20 @@ static void addSuperClass(Record *SC) { static void setValue(const std::string &ValName, std::vector<unsigned> *BitList, Init *V) { - if (!V) return ; + if (!V) return; RecordVal *RV = CurRec->getValue(ValName); if (RV == 0) { err() << "Value '" << ValName << "' unknown!\n"; exit(1); } + + // Do not allow assignments like 'X = X'. This will just cause infinite loops + // in the resolution machinery. + if (!BitList) + if (VarInit *VI = dynamic_cast<VarInit*>(V)) + if (VI->getName() == ValName) + return; // If we are assigning to a subset of the bits in the value... then we must be // assigning to a field of BitsRecTy, which must have a BitsInit @@ -154,10 +161,9 @@ static void addSubClass(Record *SC, const std::vector<Init*> &TemplateArgs) { } } - // Since everything went well, we can now set the "superclass" list for the // current record. - const std::vector<Record*> &SCs = SC->getSuperClasses(); + const std::vector<Record*> &SCs = SC->getSuperClasses(); for (unsigned i = 0, e = SCs.size(); i != e; ++i) addSuperClass(SCs[i]); addSuperClass(SC); |