[PATCH] D100826: [Debug-Info][NFC] add -gstrict-dwarf support in backend

[ChenZheng via Phabricator via cfe-commits]

shchenz created this revision.
shchenz added reviewers: dblaikie, probinson, aprantl, jsji, Esme, echristo, PowerPC.
shchenz added a project: debug-info.
Herald added a subscriber: hiraditya.
shchenz requested review of this revision.
Herald added projects: clang, LLVM.
Herald added subscribers: llvm-commits, cfe-commits.

we add `-gstrict-dwarf` support in FE in D100809 <https://reviews.llvm.org/D100809>, this patch is to add the same support in BE, it contains:
1: supporting passing the strict dwarf flags to `TargetOptions`;
2: adding a debug option `-strict-dwarf` to backend components, like llc.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100826

Files:
  clang/lib/CodeGen/BackendUtil.cpp
  llvm/include/llvm/CodeGen/CommandFlags.h
  llvm/include/llvm/Target/TargetOptions.h
  llvm/lib/CodeGen/CommandFlags.cpp


Index: llvm/lib/CodeGen/CommandFlags.cpp
===================================================================
--- llvm/lib/CodeGen/CommandFlags.cpp
+++ llvm/lib/CodeGen/CommandFlags.cpp
@@ -96,6 +96,7 @@
 CGOPT(bool, ValueTrackingVariableLocations)
 CGOPT(bool, ForceDwarfFrameSection)
 CGOPT(bool, XRayOmitFunctionIndex)
+CGOPT(bool, DebugStrictDwarf)
 
 codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
 #define CGBINDOPT(NAME)                                                        \
@@ -470,6 +471,11 @@
       cl::init(false));
   CGBINDOPT(XRayOmitFunctionIndex);
 
+  static cl::opt<bool> DebugStrictDwarf(
+      "strict-dwarf", cl::desc("use strict dwarf"),
+      cl::init(false));
+  CGBINDOPT(DebugStrictDwarf);
+
 #undef CGBINDOPT
 
   mc::RegisterMCTargetOptionsFlags();
@@ -566,6 +572,7 @@
   Options.ValueTrackingVariableLocations = getValueTrackingVariableLocations();
   Options.ForceDwarfFrameSection = getForceDwarfFrameSection();
   Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex();
+  Options.DebugStrictDwarf = getDebugStrictDwarf();
 
   Options.MCOptions = mc::InitMCTargetOptionsFromFlags();
 
Index: llvm/include/llvm/Target/TargetOptions.h
===================================================================
--- llvm/include/llvm/Target/TargetOptions.h
+++ llvm/include/llvm/Target/TargetOptions.h
@@ -141,6 +141,7 @@
           SupportsDebugEntryValues(false), EnableDebugEntryValues(false),
           PseudoProbeForProfiling(false), ValueTrackingVariableLocations(false),
           ForceDwarfFrameSection(false), XRayOmitFunctionIndex(false),
+          DebugStrictDwarf(false),
           FPDenormalMode(DenormalMode::IEEE, DenormalMode::IEEE) {}
 
     /// DisableFramePointerElim - This returns true if frame pointer elimination
@@ -331,6 +332,10 @@
     /// Emit XRay Function Index section
     unsigned XRayOmitFunctionIndex : 1;
 
+    /// When set to true, don't use DWARF extensions in later DWARF versions.
+    /// By default, it is set to false.
+    unsigned DebugStrictDwarf : 1;
+
     /// Stack protector guard offset to use.
     unsigned StackProtectorGuardOffset = -1U;
 
Index: llvm/include/llvm/CodeGen/CommandFlags.h
===================================================================
--- llvm/include/llvm/CodeGen/CommandFlags.h
+++ llvm/include/llvm/CodeGen/CommandFlags.h
@@ -140,6 +140,8 @@
 
 bool getXRayOmitFunctionIndex();
 
+bool getDebugStrictDwarf();
+
 /// Create this object with static storage to register codegen-related command
 /// line options.
 struct RegisterCodeGenFlags {
Index: clang/lib/CodeGen/BackendUtil.cpp
===================================================================
--- clang/lib/CodeGen/BackendUtil.cpp
+++ clang/lib/CodeGen/BackendUtil.cpp
@@ -598,6 +598,7 @@
           Entry.IgnoreSysRoot ? Entry.Path : HSOpts.Sysroot + Entry.Path);
   Options.MCOptions.Argv0 = CodeGenOpts.Argv0;
   Options.MCOptions.CommandLineArgs = CodeGenOpts.CommandLineArgs;
+  Options.DebugStrictDwarf = CodeGenOpts.DebugStrictDwarf;
 
   return true;
 }


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