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Ignore X = X assignments that was causing Alkis's rewrite of X86.td to crash

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tblgen.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11948 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-28 17:31:28 +00:00
parent 7b6ee7d8f1
commit 81d50adfaf
1 changed files with 9 additions and 3 deletions
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8
utils/TableGen/FileParser.y
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@ -76,6 +76,13 @@ static void setValue(const std::string &ValName,
exit(1); 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 // 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 // assigning to a field of BitsRecTy, which must have a BitsInit
// initializer... // initializer...
@ -154,7 +161,6 @@ static void addSubClass(Record *SC, const std::vector<Init*> &TemplateArgs) {
} }
} }
// Since everything went well, we can now set the "superclass" list for the // Since everything went well, we can now set the "superclass" list for the
// current record. // current record.
const std::vector<Record*> &SCs = SC->getSuperClasses(); const std::vector<Record*> &SCs = SC->getSuperClasses();