IR: Add helper to split debug info flags bitfield

Split debug info 'flags' bitfield over a vector so the current flags can
be iterated over.  This API (in combination with r230107) will be used
for assembly support for symbolic constants.

llvm-svn: 230108

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index ad75fbae80d..6590661311a 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -55,6 +55,30 @@ const char *DIDescriptor::getFlagString(unsigned Flag) {
   }
 }
 
+unsigned DIDescriptor::splitFlags(unsigned Flags,
+                                  SmallVectorImpl<unsigned> &SplitFlags) {
+  // Accessibility flags need to be specially handled, since they're packed
+  // together.
+  if (unsigned A = Flags & FlagAccessibility) {
+    if (A == FlagPrivate)
+      SplitFlags.push_back(FlagPrivate);
+    else if (A == FlagProtected)
+      SplitFlags.push_back(FlagProtected);
+    else
+      SplitFlags.push_back(FlagPublic);
+    Flags &= ~A;
+  }
+
+#define HANDLE_DI_FLAG(ID, NAME)                                               \
+  if (unsigned Bit = Flags & ID) {                                             \
+    SplitFlags.push_back(Bit);                                                 \
+    Flags &= ~Bit;                                                             \
+  }
+#include "llvm/IR/DebugInfoFlags.def"
+
+  return Flags;
+}
+
 bool DIDescriptor::Verify() const {
   return DbgNode &&
          (DIDerivedType(DbgNode).Verify() ||