[clang][Driver] Basic -gdwarf-6 support

Author: Michael137

clang/include/clang/Driver/Options.td

@@ -4715,6 +4715,10 @@ def gdwarf_4 : Flag<["-"], "gdwarf-4">, Group<g_Group>,
   HelpText<"Generate source-level debug information with dwarf version 4">;
 def gdwarf_5 : Flag<["-"], "gdwarf-5">, Group<g_Group>,
   HelpText<"Generate source-level debug information with dwarf version 5">;
+def gdwarf_6
+    : Flag<["-"], "gdwarf-6">,
+      Group<g_Group>,
+      HelpText<"Generate source-level debug information with dwarf version 6">;
 }
 def gdwarf64 : Flag<["-"], "gdwarf64">, Group<g_Group>,
   Visibility<[ClangOption, CC1Option, CC1AsOption]>,

clang/lib/Driver/ToolChains/CommonArgs.cpp

@@ -2231,7 +2231,7 @@ static unsigned ParseDebugDefaultVersion(const ToolChain &TC,
     return 0;
 
   unsigned Value = 0;
-  if (StringRef(A->getValue()).getAsInteger(10, Value) || Value > 5 ||
+  if (StringRef(A->getValue()).getAsInteger(10, Value) || Value > 6 ||
       Value < 2)
     TC.getDriver().Diag(diag::err_drv_invalid_int_value)
         << A->getAsString(Args) << A->getValue();
@@ -2244,13 +2244,14 @@ unsigned tools::DwarfVersionNum(StringRef ArgValue) {
       .Case("-gdwarf-3", 3)
       .Case("-gdwarf-4", 4)
       .Case("-gdwarf-5", 5)
+      .Case("-gdwarf-6", 6)
       .Default(0);
 }
 
 const Arg *tools::getDwarfNArg(const ArgList &Args) {
   return Args.getLastArg(options::OPT_gdwarf_2, options::OPT_gdwarf_3,
                          options::OPT_gdwarf_4, options::OPT_gdwarf_5,
-                         options::OPT_gdwarf);
+                         options::OPT_gdwarf_6, options::OPT_gdwarf);
 }
 
 unsigned tools::getDwarfVersion(const ToolChain &TC,

llvm/include/llvm/DebugInfo/DWARF/DWARFContext.h

@@ -402,7 +402,7 @@ class LLVM_ABI DWARFContext : public DIContext {
   getLocalsForAddress(object::SectionedAddress Address) override;
 
   bool isLittleEndian() const { return DObj->isLittleEndian(); }
-  static unsigned getMaxSupportedVersion() { return 5; }
+  static unsigned getMaxSupportedVersion() { return 6; }
   static bool isSupportedVersion(unsigned version) {
     return version >= 2 && version <= getMaxSupportedVersion();
   }

llvm/lib/DebugInfo/DWARF/DWARFDebugAddr.cpp

@@ -80,7 +80,7 @@ Error DWARFDebugAddrTable::extractV5(const DWARFDataExtractor &Data,
   SegSize = Data.getU8(OffsetPtr);
 
   // Perform a basic validation of the header fields.
-  if (Version != 5)
+  if (Version < 5)
     return createStringError(errc::not_supported,
                              "address table at offset 0x%" PRIx64
                              " has unsupported version %" PRIu16,