Ignore X = X assignments that was causing Alkis's rewrite of X86.td to crash
tblgen.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11948 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/FileParser.y b/utils/TableGen/FileParser.y
index af8d3d4..d0f88c3 100644
--- a/utils/TableGen/FileParser.y
+++ b/utils/TableGen/FileParser.y
@@ -68,13 +68,20 @@
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 @@
}
}
-
// 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);