We have logic in there to emit a default debugging label at the beginning of a

function. Emitting another label after the prologue messes up the debugging. We
are doing that because the first DebugLoc object it sees is different from the
previous, which was nothing. Check for this situation, and don't emit one if
it's the first.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65180 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/TableGen/AsmWriterEmitter.cpp b/utils/TableGen/AsmWriterEmitter.cpp
index 4736cca77bd28810bf1f4541498e0cb1446a433b..06495d883414e0003f24fb80e723c59cbedbbc9d 100644 (file)
--- a/utils/TableGen/AsmWriterEmitter.cpp
+++ b/utils/TableGen/AsmWriterEmitter.cpp
@@ -647,11 +647,10 @@ void AsmWriterEmitter::run(std::ostream &O) {
     << "    if (!CurDL.isUnknown()) {\n"
     << "      static DebugLocTuple PrevDLT(~0U, ~0U, ~0U);\n"
     << "      DebugLocTuple CurDLT = MF->getDebugLocTuple(CurDL);\n\n"
-    << "      if (PrevDLT != CurDLT) {\n"
+    << "      if (PrevDLT.Src != ~0U && PrevDLT != CurDLT)\n"
     << "        printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,\n"
-    << "                                        CurDLT.Src));\n"
-    << "        PrevDLT = CurDLT;\n"
-    << "      }\n"
+    << "                                        CurDLT.Src));\n\n"
+    << "      PrevDLT = CurDLT;\n"
     << "    }\n"
     << "  }\n\n";