================
@@ -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()
+ constexpr uint32_t max_ptr_count = VM_OFFSET_LIST_MAX;
+ constexpr uint32_t tag_shift = 56;
+ constexpr nub_addr_t tag_mask =
+ ((nub_addr_t)0x0f << tag_shift); // Lower half of top byte
----------------
JDevlieghere wrote:
```suggestion
((nub_addr_t)0x0f << tag_shift); // Lower half of top byte.
```
https://github.com/llvm/llvm-project/pull/160952
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