Teach TableGen to automatically generate missing SubRegIndex instances.

The RegisterInfo.td file should only specify the indexes that sources need to
refer to. The rest is inferred.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131058 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 3 deletions

diff --git a/utils/TableGen/CodeGenTarget.cpp b/utils/TableGen/CodeGenTarget.cpp
index 57f7fdc4dc..0328c9ac91 100644
--- a/utils/TableGen/CodeGenTarget.cpp
+++ b/utils/TableGen/CodeGenTarget.cpp
@@ -98,14 +98,14 @@ std::string llvm::getEnumName(MVT::SimpleValueType T) {
 /// namespace qualifier if the record contains one.
 ///
 std::string llvm::getQualifiedName(const Record *R) {
-  std::string Namespace = R->getValueAsString("Namespace");
+  std::string Namespace;
+  if (R->getValue("Namespace"))
+     Namespace = R->getValueAsString("Namespace");
   if (Namespace.empty()) return R->getName();
   return Namespace + "::" + R->getName();
 }
 
 
-
-
 /// getTarget - Return the current instance of the Target class.
 ///
 CodeGenTarget::CodeGenTarget(RecordKeeper &records) : Records(records) {
@@ -182,6 +182,13 @@ void CodeGenTarget::ReadSubRegIndices() const {
   std::sort(SubRegIndices.begin(), SubRegIndices.end(), LessRecord());
 }
 
+Record *CodeGenTarget::createSubRegIndex(const std::string &Name) {
+  Record *R = new Record(Name, SMLoc(), Records);
+  Records.addDef(R);
+  SubRegIndices.push_back(R);
+  return R;
+}
+
 void CodeGenTarget::ReadRegisterClasses() const {
   std::vector<Record*> RegClasses =
     Records.getAllDerivedDefinitions("RegisterClass");