[llvm] [DebugInfo][NVPTX] Adding support for `inlined_at` debug directive in NVPTX backend (PR #170239)

[Jeremy Morse via llvm-commits]

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@@ -1675,6 +1694,57 @@ void MCAsmStreamer::emitDwarfFile0Directive(
     emitRawText(OS1.str());
 }
 
+/// Helper to emit common .loc directive flags, isa, and discriminator
+void MCAsmStreamer::emitDwarfLocDirectiveFlags(unsigned Flags, unsigned Isa,
+                                               unsigned Discriminator) {
+  if (!MAI->supportsExtendedDwarfLocDirective())
+    return;
+
+  if (Flags & DWARF2_FLAG_BASIC_BLOCK)
+    OS << " basic_block";
+  if (Flags & DWARF2_FLAG_PROLOGUE_END)
+    OS << " prologue_end";
+  if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
+    OS << " epilogue_begin";
+
+  const unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
+  if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
+    OS << " is_stmt ";
+    OS << ((Flags & DWARF2_FLAG_IS_STMT) ? "1" : "0");
+  }
+
+  if (Isa)
+    OS << " isa " << Isa;
+  if (Discriminator)
+    OS << " discriminator " << Discriminator;
+}
+
+/// Helper to emit the common suffix of .loc directives
+void MCAsmStreamer::emitDwarfLocDirectiveSuffix(unsigned FileNo, unsigned Line,
+                                                unsigned Column, unsigned Flags,
+                                                unsigned Isa,
+                                                unsigned Discriminator,
+                                                StringRef FileName,
+                                                StringRef Comment) {
+  // Emit flags, isa, and discriminator
+  emitDwarfLocDirectiveFlags(Flags, Isa, Discriminator);
+
+  // Emit verbose comment if enabled
+  if (IsVerboseAsm) {
+    OS.PadToColumn(MAI->getCommentColumn());
+    OS << MAI->getCommentString() << ' ';
+    if (Comment.empty())
+      OS << FileName << ':' << Line << ':' << Column;
+    else
+      OS << Comment;
+  }
+
+  // Emit end of line and update parent state
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jmorse wrote:

Superclass rather than parent?

https://github.com/llvm/llvm-project/pull/170239