TableGen: Handle nontrivial foreach range bounds

This allows using anything that isn't a literal integer as the bounds
for a foreach. Some of the diagnostics aren't perfect, but nobody ever
accused tablegen of having good errors. For example, the existing
wording suggests a bitrange is valid, but as far as I can tell this
has never worked.

Fixes bug 41958.

llvm-svn: 361434

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/TableGen/TGParser.h b/llvm/lib/TableGen/TGParser.h
index 38b782461bd..af2b639f8d5 100644
--- a/llvm/lib/TableGen/TGParser.h
+++ b/llvm/lib/TableGen/TGParser.h
@@ -190,7 +190,8 @@ private:  // Parser methods.
   bool ParseOptionalRangeList(SmallVectorImpl<unsigned> &Ranges);
   bool ParseOptionalBitList(SmallVectorImpl<unsigned> &Ranges);
   void ParseRangeList(SmallVectorImpl<unsigned> &Result);
-  bool ParseRangePiece(SmallVectorImpl<unsigned> &Ranges);
+  bool ParseRangePiece(SmallVectorImpl<unsigned> &Ranges,
+                       TypedInit *FirstItem = nullptr);
   RecTy *ParseType();
   Init *ParseOperation(Record *CurRec, RecTy *ItemType);
   Init *ParseOperationCond(Record *CurRec, RecTy *ItemType);