| warning: sharing memory with a native function called via FFI |
| --> tests/native-lib/pass/ptr_read_access.rs:LL:CC |
| | |
| LL | unsafe { print_pointer(&x) }; |
| | ^^^^^^^^^^^^^^^^^ sharing memory with a native function |
| | |
| = help: when memory is shared with a native function call, Miri can only track initialisation and provenance on a best-effort basis |
| = help: in particular, Miri assumes that the native call initializes all memory it has written to |
| = help: Miri also assumes that any part of this memory may be a pointer that is permitted to point to arbitrary exposed memory |
| = help: what this means is that Miri will easily miss Undefined Behavior related to incorrect usage of this shared memory, so you should not take a clean Miri run as a signal that your FFI code is UB-free |
| = help: tracing memory accesses in native code is not yet fully implemented, so there can be further imprecisions beyond what is documented here |
| = note: BACKTRACE: |
| = note: inside `test_access_pointer` at tests/native-lib/pass/ptr_read_access.rs:LL:CC |
| note: inside `main` |
| --> tests/native-lib/pass/ptr_read_access.rs:LL:CC |
| | |
| LL | test_access_pointer(); |
| | ^^^^^^^^^^^^^^^^^^^^^ |
| |
