[llvm][tblgen] Add `Source Filename` for `emitSourceFileHeader` (#65744)

I think this is very helpful for reading generated `.inc` files.

1 files changed, 9 insertions, 1 deletions

diff --git a/llvm/lib/TableGen/TableGenBackend.cpp b/llvm/lib/TableGen/TableGenBackend.cpp
index 705c3a1..035abe9 100644
--- a/llvm/lib/TableGen/TableGenBackend.cpp
+++ b/llvm/lib/TableGen/TableGenBackend.cpp
@@ -12,6 +12,7 @@
 
 #include "llvm/TableGen/TableGenBackend.h"
 #include "llvm/ADT/Twine.h"
+#include "llvm/Support/Path.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>
@@ -40,7 +41,8 @@ static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
   OS << Suffix << '\n';
 }
 
-void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
+void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS,
+                                const RecordKeeper &Record) {
   printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\");
   StringRef Prefix("|* ");
   StringRef Suffix(" *|");
@@ -56,6 +58,12 @@ void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
   printLine(OS, Prefix, ' ', Suffix);
   printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ',
             Suffix);
+
+  // Print the filename of source file
+  if (!Record.getInputFilename().empty())
+    printLine(
+        OS, Prefix + "From: " + sys::path::filename(Record.getInputFilename()),
+        ' ', Suffix);
   printLine(OS, Prefix, ' ', Suffix);
   printLine(OS, "\\*===", '-', "===*/");
   OS << '\n';