[Lldb-commits] [lldb] [debugserver] Support for `qMemTags` packet (PR #160952)

[Jonas Devlieghere via lldb-commits]

================
@@ -150,6 +152,63 @@ nub_bool_t MachVMMemory::GetMemoryRegionInfo(task_t task, nub_addr_t address,
   return true;
 }
 
+// API availability:
+//  mach_vm_update_pointers_with_remote_tags() - 26.0
+//  VM_OFFSET_LIST_MAX macro - 26.1
+#ifndef VM_OFFSET_LIST_MAX
+#define VM_OFFSET_LIST_MAX 512
+#endif
+using mach_vm_offset_list_t = mach_vm_offset_t *;
+using mach_vm_update_pointers_with_remote_tags_t = kern_return_t(
+    mach_port_name_t target, mach_vm_offset_list_t in_pointer_list,
+    mach_msg_type_number_t in_pointer_listCnt,
+    mach_vm_offset_list_t out_pointer_list,
+    mach_msg_type_number_t *out_pointer_listCnt);
+
+nub_bool_t MachVMMemory::GetMemoryTags(task_t task, nub_addr_t address,
+                                       nub_size_t size,
+                                       std::vector<uint8_t> &tags) {
+  static auto mach_vm_update_pointers_with_remote_tags =
+      (mach_vm_update_pointers_with_remote_tags_t *)dlsym(
+          RTLD_DEFAULT, "mach_vm_update_pointers_with_remote_tags");
+  assert(mach_vm_update_pointers_with_remote_tags);
+
+  // Max batch size supported by mach_vm_update_pointers_with_remote_tags()
----------------
JDevlieghere wrote:

```suggestion
  // Max batch size supported by mach_vm_update_pointers_with_remote_tags.
```

https://github.com/llvm/llvm-project/pull/160952