[clang] [clang][Interp] Enhance CodePtr (PR #101787)

[Timm Baeder via cfe-commits]

https://github.com/tbaederr created https://github.com/llvm/llvm-project/pull/101787

Add more relational operators.

>From 02ba0cd327c91d65ac6d4ee7699a590cea6a92ec Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbaeder at redhat.com>
Date: Fri, 2 Aug 2024 17:45:19 +0200
Subject: [PATCH] [clang][Interp] Enhance CodePtr

Add more relational operators.
---
 clang/lib/AST/Interp/Source.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/clang/lib/AST/Interp/Source.h b/clang/lib/AST/Interp/Source.h
index c28b488ff554d..88b5ec7740df5 100644
--- a/clang/lib/AST/Interp/Source.h
+++ b/clang/lib/AST/Interp/Source.h
@@ -29,7 +29,7 @@ class Function;
 /// Pointer into the code segment.
 class CodePtr final {
 public:
-  CodePtr() : Ptr(nullptr) {}
+  CodePtr() = default;
 
   CodePtr &operator+=(int32_t Offset) {
     Ptr += Offset;
@@ -45,11 +45,16 @@ class CodePtr final {
     assert(Ptr != nullptr && "Invalid code pointer");
     return CodePtr(Ptr - RHS);
   }
+  CodePtr operator+(ssize_t RHS) const {
+    assert(Ptr != nullptr && "Invalid code pointer");
+    return CodePtr(Ptr + RHS);
+  }
 
   bool operator!=(const CodePtr &RHS) const { return Ptr != RHS.Ptr; }
   const std::byte *operator*() const { return Ptr; }
-
-  operator bool() const { return Ptr; }
+  explicit operator bool() const { return Ptr; }
+  bool operator<=(const CodePtr &RHS) const { return Ptr <= RHS.Ptr; }
+  bool operator>=(const CodePtr &RHS) const { return Ptr >= RHS.Ptr; }
 
   /// Reads data and advances the pointer.
   template <typename T> std::enable_if_t<!std::is_pointer<T>::value, T> read() {
@@ -65,7 +70,7 @@ class CodePtr final {
   /// Constructor used by Function to generate pointers.
   CodePtr(const std::byte *Ptr) : Ptr(Ptr) {}
   /// Pointer into the code owned by a function.
-  const std::byte *Ptr;
+  const std::byte *Ptr = nullptr;
 };
 
 /// Describes the statement/declaration an opcode was generated from.