DebugInfo: Avoid creating unnecessary/empty line tables and remove the special case of '0' in DwarfCompileUnit::initStmtList by just always using a label difference

This moves one case of raw text checking down into the MCStreamer
interfaces in the form of a virtual function, even if we ultimately end
up consolidating on the one-or-many line tables issue one day, this is
nicer in the interim. This just generally streamlines a bunch of use
cases into a common code path.

llvm-svn: 205287

1 files changed, 2 insertions, 11 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index eaf0a17f052..dc3917b5857 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -2070,13 +2070,7 @@ void DwarfUnit::addRange(RangeSpan Range) {
 void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
   // Define start line table label for each Compile Unit.
   MCSymbol *LineTableStartSym =
-      Asm->GetTempSymbol("line_table_start", getUniqueID());
-  Asm->OutStreamer.getContext().setMCLineTableSymbol(LineTableStartSym,
-                                                     getUniqueID());
-
-  // Use a single line table if we are generating assembly.
-  bool UseTheFirstCU =
-      Asm->OutStreamer.hasRawTextSupport() || (getUniqueID() == 0);
+      Asm->OutStreamer.getDwarfLineTableSymbol(getUniqueID());
 
   stmtListIndex = UnitDie->getValues().size();
 
@@ -2086,10 +2080,7 @@ void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
   // The line table entries are not always emitted in assembly, so it
   // is not okay to use line_table_start here.
   if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
-    addSectionLabel(UnitDie.get(), dwarf::DW_AT_stmt_list,
-                    UseTheFirstCU ? DwarfLineSectionSym : LineTableStartSym);
-  else if (UseTheFirstCU)
-    addSectionOffset(UnitDie.get(), dwarf::DW_AT_stmt_list, 0);
+    addSectionLabel(UnitDie.get(), dwarf::DW_AT_stmt_list, LineTableStartSym);
   else
     addSectionDelta(UnitDie.get(), dwarf::DW_AT_stmt_list, LineTableStartSym,
                     DwarfLineSectionSym);