[lldb-dap] Add a -v/--version command line argument

[JDevlieghere]

Add a -v/--version command line argument to print the version of both the lldb-dap binary and the liblldb it's linked against.

This is motivated by me trying to figure out which lldb-dap I had in my PATH.

[llvmbot]

@llvm/pr-subscribers-lldb

Author: Jonas Devlieghere (JDevlieghere)

Changes

Add a -v/--version command line argument to print the version of both the lldb-dap binary and the liblldb it's linked against.

This is motivated by me trying to figure out which lldb-dap I had in my PATH.

---

Full diff: https://github.com/llvm/llvm-project/pull/134114.diff

4 Files Affected:

• (renamed) lldb/test/Shell/DAP/TestHelp.test (+1-1)
• (added) lldb/test/Shell/DAP/TestVersion.test (+3)
• (modified) lldb/tools/lldb-dap/Options.td (+6)
• (modified) lldb/tools/lldb-dap/lldb-dap.cpp (+12)

diff --git a/lldb/test/Shell/DAP/TestOptions.test b/lldb/test/Shell/DAP/TestHelp.test
similarity index 88%
rename from lldb/test/Shell/DAP/TestOptions.test
rename to lldb/test/Shell/DAP/TestHelp.test
index d290cdae590fd..6033cf15e3835 100644
--- a/lldb/test/Shell/DAP/TestOptions.test
+++ b/lldb/test/Shell/DAP/TestHelp.test
@@ -4,5 +4,5 @@
 # CHECK: --help
 # CHECK: -h
 # CHECK: --repl-mode
+# CHECK: --version
 # CHECK: --wait-for-debugger
-
diff --git a/lldb/test/Shell/DAP/TestVersion.test b/lldb/test/Shell/DAP/TestVersion.test
new file mode 100644
index 0000000000000..ad3ff67e45d79
--- /dev/null
+++ b/lldb/test/Shell/DAP/TestVersion.test
@@ -0,0 +1,3 @@
+# RUN: lldb-dap --version | FileCheck %s
+# CHECK: lldb-dap:
+# CHECK: liblldb:
diff --git a/lldb/tools/lldb-dap/Options.td b/lldb/tools/lldb-dap/Options.td
index a1baf2f0370bd..aecf91797ac70 100644
--- a/lldb/tools/lldb-dap/Options.td
+++ b/lldb/tools/lldb-dap/Options.td
@@ -11,6 +11,12 @@ def: Flag<["-"], "h">,
   Alias<help>,
   HelpText<"Alias for --help">;
 
+def version: F<"version">,
+  HelpText<"Prints out the lldb-dap version.">;
+def: Flag<["-"], "v">,
+  Alias<version>,
+  HelpText<"Alias for --version">;
+
 def wait_for_debugger: F<"wait-for-debugger">,
   HelpText<"Pause the program at startup.">;
 def: Flag<["-"], "g">,
diff --git a/lldb/tools/lldb-dap/lldb-dap.cpp b/lldb/tools/lldb-dap/lldb-dap.cpp
index b91c62e921428..ec87db6aab330 100644
--- a/lldb/tools/lldb-dap/lldb-dap.cpp
+++ b/lldb/tools/lldb-dap/lldb-dap.cpp
@@ -31,6 +31,7 @@
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/OptTable.h"
 #include "llvm/Option/Option.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/InitLLVM.h"
@@ -177,6 +178,12 @@ static void PrintHelp(LLDBDAPOptTable &table, llvm::StringRef tool_name) {
 )___";
 }
 
+static void PrintVersion() {
+  llvm::outs() << "lldb-dap: ";
+  llvm::cl::PrintVersionMessage();
+  llvm::outs() << "liblldb: " << lldb::SBDebugger::GetVersionString() << '\n';
+}
+
 // If --launch-target is provided, this instance of lldb-dap becomes a
 // runInTerminal launcher. It will ultimately launch the program specified in
 // the --launch-target argument, which is the original program the user wanted
@@ -421,6 +428,11 @@ int main(int argc, char *argv[]) {
     return EXIT_SUCCESS;
   }
 
+  if (input_args.hasArg(OPT_version)) {
+    PrintVersion();
+    return EXIT_SUCCESS;
+  }
+
   ReplMode default_repl_mode = ReplMode::Auto;
   if (input_args.hasArg(OPT_repl_mode)) {
     llvm::opt::Arg *repl_mode = input_args.getLastArg(OPT_repl_mode);

[JDevlieghere]

ToT output:

❯ ./bin/lldb-dap -v
lldb-dap: LLVM (http://llvm.org/):
  LLVM version 21.0.0git
  Optimized build with assertions.
liblldb: lldb version 21.0.0git (git@github.com:llvm/llvm-project.git revision 90f1e4fc39e4601285538d0df4b6984c27545b41)
  clang revision 90f1e4fc39e4601285538d0df4b6984c27545b41
  llvm revision 90f1e4fc39e4601285538d0df4b6984c27545b41