DebugInfo: Emit relocation to debug_line section when emitting asm for asm

I don't think this is reachable by any frontend (why would you transform
asm to asm+debug info?) but it helps tidy up some of this code, avoid
the weird special case of "emit the first CU, store the label, then emit
the rest" in MCDwarfLineTable::Emit by instead having the
DWARF-for-assembly case use the same codepath as DwarfDebug.cpp, by
registering the label of the debug_line section, thus causing it to be
emitted. (with a special case in asm output to just emit the label since
asm output uses the .loc directives, etc, rather than the debug_loc
directly)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205286 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 5 deletions

diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index ac6ebbde7b..910a424ce8 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -661,11 +661,15 @@ bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
     return TokError("unmatched .ifs or .elses");
 
   // Check to see there are no empty DwarfFile slots.
-  const SmallVectorImpl<MCDwarfFile> &MCDwarfFiles =
-      getContext().getMCDwarfFiles();
-  for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
-    if (MCDwarfFiles[i].Name.empty())
-      TokError("unassigned file number: " + Twine(i) + " for .file directives");
+  const auto &LineTables = getContext().getMCDwarfLineTables();
+  if (!LineTables.empty()) {
+    unsigned Index = 0;
+    for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) {
+      if (File.Name.empty() && Index != 0)
+        TokError("unassigned file number: " + Twine(Index) +
+                 " for .file directives");
+      ++Index;
+    }
   }
 
   // Check to see that all assembler local symbols were actually defined.