Add more DWARF 5 language constants.

[echristo]

Hi Bruce,

The DWARF5 standard hasn't been released yet and so the numbers aren't
technically final yet so I've been avoiding making those changes if
possible. Mind holding off a couple weeks until (I hope) the preliminary
review copy is released?

Thanks!

-eric

[echristo]

After discussion on the lldb bug I've been convinced that we can label these as "subject to change" but allow people to get testing going.

LGTM.

-eric

[brucem]

Update for recent changes on HEAD.

[echristo]

LGTM still. Thanks!

-eric

llvm/trunk/include/llvm/Support/Dwarf.def

 HANDLE_DW_LANG(0x0014, Python)
 HANDLE_DW_LANG(0x0015, OpenCL)
 HANDLE_DW_LANG(0x0016, Go)
 HANDLE_DW_LANG(0x0017, Modula3)
 HANDLE_DW_LANG(0x0018, Haskell)
 HANDLE_DW_LANG(0x0019, C_plus_plus_03)
 HANDLE_DW_LANG(0x001a, C_plus_plus_11)
 HANDLE_DW_LANG(0x001b, OCaml)
+HANDLE_DW_LANG(0x001c, Rust)
+HANDLE_DW_LANG(0x001d, C11)
+HANDLE_DW_LANG(0x001e, Swift)
+HANDLE_DW_LANG(0x001f, Julia)
+HANDLE_DW_LANG(0x0020, Dylan)
+HANDLE_DW_LANG(0x0021, C_plus_plus_14)
+HANDLE_DW_LANG(0x0022, Fortran03)
+HANDLE_DW_LANG(0x0023, Fortran08)
 HANDLE_DW_LANG(0x8001, Mips_Assembler)
 
 // DWARF attribute type encodings.
 HANDLE_DW_ATE(0x01, address)
 HANDLE_DW_ATE(0x02, boolean)
 HANDLE_DW_ATE(0x03, complex_float)
 HANDLE_DW_ATE(0x04, float)
 HANDLE_DW_ATE(0x05, signed)

llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp

int64_t DwarfUnit::getDefaultLowerBound() const {
   case dwarf::DW_LANG_Cobol74:
   case dwarf::DW_LANG_Cobol85:
   case dwarf::DW_LANG_Modula2:
   case dwarf::DW_LANG_Pascal83:
   case dwarf::DW_LANG_PLI:
     if (dwarf::DWARF_VERSION >= 4)
       return 1;
     break;
+
+  // The languages below have valid values only if the DWARF version >= 5.
+  case dwarf::DW_LANG_OpenCL:
+  case dwarf::DW_LANG_Go:
+  case dwarf::DW_LANG_Haskell:
+  case dwarf::DW_LANG_C_plus_plus_03:
+  case dwarf::DW_LANG_C_plus_plus_11:
+  case dwarf::DW_LANG_OCaml:
+  case dwarf::DW_LANG_Rust:
+  case dwarf::DW_LANG_C11:
+  case dwarf::DW_LANG_Swift:
+  case dwarf::DW_LANG_Dylan:
+  case dwarf::DW_LANG_C_plus_plus_14:
+    if (dwarf::DWARF_VERSION >= 5)
+      return 0;
+    break;
+
+  case dwarf::DW_LANG_Modula3:
+  case dwarf::DW_LANG_Julia:
+  case dwarf::DW_LANG_Fortran03:
+  case dwarf::DW_LANG_Fortran08:
+    if (dwarf::DWARF_VERSION >= 5)
+      return 1;
+    break;
   }
 
   return -1;
 }
 
 /// Check whether the DIE for this MDNode can be shared across CUs.
 static bool isShareableAcrossCUs(DIDescriptor D) {
   // When the MDNode can be part of the type system, the DIE can be shared

llvm/trunk/lib/IR/DIBuilder.cpp

 DICompileUnit DIBuilder::createCompileUnit(unsigned Lang, StringRef Filename,
                                            StringRef Directory,
                                            StringRef Producer, bool isOptimized,
                                            StringRef Flags, unsigned RunTimeVer,
                                            StringRef SplitName,
                                            DebugEmissionKind Kind,
                                            bool EmitDebugInfo) {
 
-  assert(((Lang <= dwarf::DW_LANG_OCaml && Lang >= dwarf::DW_LANG_C89) ||
+  assert(((Lang <= dwarf::DW_LANG_Fortran08 && Lang >= dwarf::DW_LANG_C89) ||
           (Lang <= dwarf::DW_LANG_hi_user && Lang >= dwarf::DW_LANG_lo_user)) &&
          "Invalid Language tag");
   assert(!Filename.empty() &&
          "Unable to create compile unit without filename");
   Metadata *TElts[] = {HeaderBuilder::get(DW_TAG_base_type).get(VMContext)};
   TempEnumTypes = MDNode::getTemporary(VMContext, TElts).release();
 
   TempRetainTypes = MDNode::getTemporary(VMContext, TElts).release();