[DEBUG] Initial adaptation of NVPTX target for debug info emission.

Summary:
Patch adds initial emission of the debug info for NVPTX target.
Currently, only .file and .loc directives are emitted, everything else is
commented out to not break the compilation of Cuda.

Reviewers: echristo, jlebar, tra, jholewinski

Subscribers: mgorny, aprantl, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D41827

llvm-svn: 330271

1 files changed, 15 insertions, 7 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index a8e36ec66e5..c8740d72b00 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -312,7 +312,11 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
   } else
     TheAccelTableKind = AccelTables;
 
-  UseInlineStrings = DwarfInlinedStrings == Enable;
+  if (DwarfInlinedStrings == Default)
+    UseInlineStrings = TT.isNVPTX();
+  else
+    UseInlineStrings = DwarfInlinedStrings == Enable;
+
   HasAppleExtensionAttributes = tuneForLLDB();
 
   // Handle split DWARF.
@@ -327,14 +331,18 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
   unsigned DwarfVersionNumber = Asm->TM.Options.MCOptions.DwarfVersion;
   unsigned DwarfVersion = DwarfVersionNumber ? DwarfVersionNumber
                                     : MMI->getModule()->getDwarfVersion();
-  // Use dwarf 4 by default if nothing is requested.
-  DwarfVersion = DwarfVersion ? DwarfVersion : dwarf::DWARF_VERSION;
+  // Use dwarf 4 by default if nothing is requested. For NVPTX, use dwarf 2.
+  DwarfVersion =
+      TT.isNVPTX() ? 2 : (DwarfVersion ? DwarfVersion : dwarf::DWARF_VERSION);
 
-  UsePubSections = !NoDwarfPubSections;
-  UseRangesSection = !NoDwarfRangesSection;
+  UsePubSections = !NoDwarfPubSections && !TT.isNVPTX();
+  UseRangesSection = !NoDwarfRangesSection && !TT.isNVPTX();
 
-  // Use sections as references.
-  UseSectionsAsReferences = DwarfSectionsAsReferences == Enable;
+  // Use sections as references. Force for NVPTX.
+  if (DwarfSectionsAsReferences == Default)
+    UseSectionsAsReferences = TT.isNVPTX();
+  else
+    UseSectionsAsReferences = DwarfSectionsAsReferences == Enable;
 
   // Work around a GDB bug. GDB doesn't support the standard opcode;
   // SCE doesn't support GNU's; LLDB prefers the standard opcode, which