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TableGen: Allow use of #NAME# outside of 'def' names.

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Previously, def NAME values were only populated, and references to NAME
resolved, when NAME was referenced in the 'def' entry of the multiclass
sub-entry. e.g.,
multiclass foo<...> {
  def prefix_#NAME : ...
}

It's useful, however, to be able to reference NAME even when the default
def name is used. For example, when a multiclass has 'def : Pat<...>'
or 'def : InstAlias<...>' entries which refer to earlier instruction
definitions in the same multiclass. e.g.,
multiclass myMulti<RegisterClass rc> {
  def _r : myI<(outs rc:$d), (ins rc:$r), "r $d, $r", []>;

  def : InstAlias<\"wilma $r\", (!cast<Instruction>(NAME#\"_r\") rc:$r, rc:$r)>;
}

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2012-08-02 18:46:42 +00:00
parent 79a20ce6f0
commit cfbda4a04d
1 changed files with 21 additions and 11 deletions
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18
lib/TableGen/TGParser.cpp
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@ -2284,8 +2284,9 @@ InstantiateMulticlassDef(MultiClass &MC,
Ref.Rec = DefProto;
AddSubClass(CurRec, Ref);
if (DefNameString == 0) {
// We must resolve references to NAME.
// Set the value for NAME. We don't resolve references to it 'til later,
// though, so that uses in nested multiclass names don't get
// confused.
if (SetValue(CurRec, Ref.RefLoc, "NAME", std::vector<unsigned>(),
DefmPrefix)) {
Error(DefmPrefixLoc, "Could not resolve "
@ -2294,13 +2295,22 @@ InstantiateMulticlassDef(MultiClass &MC,
return 0;
}
// If the DefNameString didn't resolve, we probably have a reference to
// NAME and need to replace it. We need to do at least this much greedily,
// otherwise nested multiclasses will end up with incorrect NAME expansions.
if (DefNameString == 0) {
RecordVal *DefNameRV = CurRec->getValue("NAME");
CurRec->resolveReferencesTo(DefNameRV);
}
if (!CurMultiClass) {
// We do this after resolving NAME because before resolution, many
// multiclass defs will have the same name expression. If we are
// Now that we're at the top level, resolve all NAME references
// in the resultant defs that weren't in the def names themselves.
RecordVal *DefNameRV = CurRec->getValue("NAME");
CurRec->resolveReferencesTo(DefNameRV);
// Now that NAME references are resolved and we're at the top level of
// any multiclass expansions, add the record to the RecordKeeper. If we are
// currently in a multiclass, it means this defm appears inside a
// multiclass and its name won't be fully resolvable until we see
// the top-level defm. Therefore, we don't add this to the