[clang] [clang][Interp] Member Pointers (PR #91303)

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Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>,
Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>,
Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/91303 at github.com>


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@@ -0,0 +1,112 @@
+//===------------------------- MemberPointer.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_CLANG_AST_INTERP_MEMBER_POINTER_H
+#define LLVM_CLANG_AST_INTERP_MEMBER_POINTER_H
+
+#include "Pointer.h"
+#include <optional>
+
+namespace clang {
+class ASTContext;
+namespace interp {
+
+class Context;
+class FunctionPointer;
+
+class MemberPointer final {
+private:
+  Pointer Base;
+  const Decl *Dcl = nullptr;
+  int32_t PtrOffset = 0;
+
+  MemberPointer(Pointer Base, const Decl *Dcl, int32_t PtrOffset)
+      : Base(Base), Dcl(Dcl), PtrOffset(PtrOffset) {}
+
+public:
+  MemberPointer() = default;
+  MemberPointer(Pointer Base, const Decl *Dcl) : Base(Base), Dcl(Dcl) {}
+  MemberPointer(uint32_t Address, const Descriptor *D) {
+    // This should be impossible to hit, at least I've been unable
+    // to write a test for it.
+  }
+
+  MemberPointer(const Decl *D) : Dcl(D) {
+    assert(isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) ||
+           isa<CXXMethodDecl>(D));
----------------
cor3ntin wrote:

`assert((isa<FieldDecl, IndirectFieldDecl, CXXMethodDecl>(D)))` should

https://github.com/llvm/llvm-project/pull/91303