Wire up support for the controlling the extended dwarf .file directive. With

r142300 but not this patch, clang -S may emit .s files that assemblers other
than llvm-mc can't parse.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142301 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Driver/CC1Options.td

@@ -117,6 +117,8 @@ def fforbid_guard_variables : Flag<"-fforbid-guard-variables">,
 def g : Flag<"-g">, HelpText<"Generate source level debug information">;
 def fno_dwarf2_cfi_asm : Flag<"-fno-dwarf2-cfi-asm">,
   HelpText<"Don't use the cfi directives">;
+def fno_dwarf_directory_asm : Flag<"-fno-dwarf-directory-asm">,
+  HelpText<"Don't separate directory and filename in .file directives">;
 def fcatch_undefined_behavior : Flag<"-fcatch-undefined-behavior">,
   HelpText<"Generate runtime checks for undefined behavior.">;
 def flimit_debug_info : Flag<"-flimit-debug-info">,

include/clang/Driver/Options.td

@@ -301,6 +301,8 @@ def fdiagnostics_show_category_EQ : Joined<"-fdiagnostics-show-category=">, Grou
 def fdollars_in_identifiers : Flag<"-fdollars-in-identifiers">, Group<f_Group>;
 def fdwarf2_cfi_asm : Flag<"-fdwarf2-cfi-asm">, Group<f_Group>;
 def fno_dwarf2_cfi_asm : Flag<"-fno-dwarf2-cfi-asm">, Group<f_Group>;
+def fdwarf_directory_asm : Flag<"-fdwarf-directory-asm">, Group<f_Group>;
+def fno_dwarf_directory_asm : Flag<"-fno-dwarf-directory-asm">, Group<f_Group>;
 def felide_constructors : Flag<"-felide-constructors">, Group<f_Group>;
 def feliminate_unused_debug_symbols : Flag<"-feliminate-unused-debug-symbols">, Group<f_Group>;
 def femit_all_decls : Flag<"-femit-all-decls">, Group<f_Group>;

include/clang/Frontend/CodeGenOptions.h

@@ -71,6 +71,8 @@ public:
   unsigned MergeAllConstants : 1; /// Merge identical constants.
   unsigned NoCommon          : 1; /// Set when -fno-common or C++ is enabled.
   unsigned NoDwarf2CFIAsm    : 1; /// Set when -fno-dwarf2-cfi-asm is enabled.
+  unsigned NoDwarfDirectoryAsm : 1; /// Set when -fno-dwarf-directory-asm is
+                                    /// enabled.
   unsigned NoExecStack       : 1; /// Set when -Wa,--noexecstack is enabled.
   unsigned NoGlobalMerge     : 1; /// Set when -mno-global-merge is enabled.
   unsigned NoImplicitFloat   : 1; /// Set when -mno-implicit-float is enabled.

lib/CodeGen/BackendUtil.cpp

@@ -305,6 +305,8 @@ bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
     TM->setMCSaveTempLabels(true);
   if (CodeGenOpts.NoDwarf2CFIAsm)
     TM->setMCUseCFI(false);
+  if (CodeGenOpts.NoDwarfDirectoryAsm)
+    TM->setMCUseDwarfDirectory(false);
   if (CodeGenOpts.NoExecStack)
     TM->setMCNoExecStack(true);
 

lib/Driver/Tools.cpp

@@ -1060,6 +1060,18 @@ static bool ShouldDisableCFI(const ArgList &Args,
   return false;
 }
 
+static bool ShouldDisableDwarfDirectory(const ArgList &Args,
+                                        const ToolChain &TC) {
+  bool IsIADefault = TC.IsIntegratedAssemblerDefault();
+  bool UseIntegratedAs = Args.hasFlag(options::OPT_integrated_as,
+                                      options::OPT_no_integrated_as,
+                                      IsIADefault);
+  bool UseDwarfDirectory = Args.hasFlag(options::OPT_fdwarf_directory_asm,
+                                        options::OPT_fno_dwarf_directory_asm,
+                                        UseIntegratedAs);
+  return !UseDwarfDirectory;
+}
+
 /// \brief Check whether the given input tree contains any compilation actions.
 static bool ContainsCompileAction(const Action *A) {
   if (isa<CompileJobAction>(A))
@@ -1614,6 +1626,9 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   if (ShouldDisableCFI(Args, getToolChain()))
     CmdArgs.push_back("-fno-dwarf2-cfi-asm");
 
+  if (ShouldDisableDwarfDirectory(Args, getToolChain()))
+    CmdArgs.push_back("-fno-dwarf-directory-asm");
+
   if (Arg *A = Args.getLastArg(options::OPT_ftemplate_depth_)) {
     CmdArgs.push_back("-ftemplate-depth");
     CmdArgs.push_back(A->getValue(Args));

lib/Frontend/CompilerInvocation.cpp

@@ -231,6 +231,8 @@ static void CodeGenOptsToArgs(const CodeGenOptions &Opts,
     Res.push_back("-msave-temp-labels");
   if (Opts.NoDwarf2CFIAsm)
     Res.push_back("-fno-dwarf2-cfi-asm");
+  if (Opts.NoDwarfDirectoryAsm)
+    Res.push_back("-fno-dwarf-directory-asm");
   if (Opts.SoftFloat)
     Res.push_back("-msoft-float");
   if (Opts.UnwindTables)
@@ -1051,6 +1053,7 @@ static void ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
+  Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
   Opts.UnsafeFPMath = Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
                       Args.hasArg(OPT_cl_fast_relaxed_math);

tools/driver/cc1as_main.cpp

@@ -292,7 +292,9 @@ static bool ExecuteAssembler(AssemblerInvocation &Opts,
     }
     Str.reset(TheTarget->createAsmStreamer(Ctx, *Out, /*asmverbose*/true,
                                            /*useLoc*/ true,
-                                           /*useCFI*/ true, IP, CE, MAB,
+                                           /*useCFI*/ true,
+                                           /*useDwarfDirectory*/ true,
+                                           IP, CE, MAB,
                                            Opts.ShowInst));
   } else if (Opts.OutputType == AssemblerInvocation::FT_Null) {
     Str.reset(createNullStreamer(Ctx));