[codeview] Flush labels before S_DEFRANGE* fragments

This was a pre-existing bug that could be triggered with assembly like
this:
  .p2align 2
  .LtmpN:
  .cv_def_range "..."

I noticed this when attempting to change clang to emit aligned symbol
records.

llvm-svn: 349403

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/lib/MC/MCObjectStreamer.cpp b/llvm/lib/MC/MCObjectStreamer.cpp
index 248c5a1fe35..6ec705bdddb 100644
--- a/llvm/lib/MC/MCObjectStreamer.cpp
+++ b/llvm/lib/MC/MCObjectStreamer.cpp
@@ -497,7 +497,11 @@ void MCObjectStreamer::EmitCVInlineLinetableDirective(
 void MCObjectStreamer::EmitCVDefRangeDirective(
     ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
     StringRef FixedSizePortion) {
-  getContext().getCVContext().emitDefRange(*this, Ranges, FixedSizePortion);
+  MCFragment *Frag =
+      getContext().getCVContext().emitDefRange(*this, Ranges, FixedSizePortion);
+  // Attach labels that were pending before we created the defrange fragment to
+  // the beginning of the new fragment.
+  flushPendingLabels(Frag, 0);
   this->MCStreamer::EmitCVDefRangeDirective(Ranges, FixedSizePortion);
 }