[llvm] [SandboxVec] Implement Pass class (PR #107617)

[via llvm-commits]

================
@@ -0,0 +1,83 @@
+//===- Pass.h ---------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_VECTORIZE_SANDBOXVECTORIZER_PASS_H
+#define LLVM_TRANSFORMS_VECTORIZE_SANDBOXVECTORIZER_PASS_H
+
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include <string>
+
+namespace llvm::sandboxir {
+
+class Function;
+
+/// The base class of a Sandbox IR Pass.
+class Pass {
+public:
+  enum class ClassID : unsigned {
+    FunctionPass,
+  };
+  static const char *getSubclassIDStr(ClassID ID) {
+    switch (ID) {
+    case ClassID::FunctionPass:
+      return "FunctionPass";
+    }
+    llvm_unreachable("Unimplemented ID");
+  }
+
+protected:
+  /// The pass name.
+  const std::string Name;
+  /// The command-line flag used to specify that this pass should run.
+  const std::string Flag;
----------------
vporpo wrote:

The user could give arbitrarily large names/flags so isn't an std::string better? I mean, what size should I use?

https://github.com/llvm/llvm-project/pull/107617