| use alloc::boxed::Box; |
| use core::ffi::c_void; |
| |
| extern "Rust" { |
| fn miri_get_backtrace(flags: u64) -> Box<[*mut ()]>; |
| fn miri_resolve_frame(ptr: *mut (), flags: u64) -> MiriFrame; |
| } |
| |
| #[derive(Clone, Debug)] |
| #[repr(C)] |
| pub struct MiriFrame { |
| pub name: Box<[u8]>, |
| pub filename: Box<[u8]>, |
| pub lineno: u32, |
| pub colno: u32, |
| pub fn_ptr: *mut c_void, |
| } |
| |
| #[derive(Debug, Clone)] |
| pub struct Frame { |
| pub addr: *mut c_void, |
| pub inner: MiriFrame, |
| } |
| |
| // SAFETY: Miri guarantees that the returned pointer |
| // can be used from any thread. |
| unsafe impl Send for Frame {} |
| unsafe impl Sync for Frame {} |
| |
| impl Frame { |
| pub fn ip(&self) -> *mut c_void { |
| self.addr |
| } |
| |
| pub fn sp(&self) -> *mut c_void { |
| core::ptr::null_mut() |
| } |
| |
| pub fn symbol_address(&self) -> *mut c_void { |
| self.inner.fn_ptr |
| } |
| |
| pub fn module_base_address(&self) -> Option<*mut c_void> { |
| None |
| } |
| } |
| |
| pub fn trace<F: FnMut(&super::Frame) -> bool>(cb: F) { |
| // SAFETY: Miri guarantees that the backtrace API functions |
| // can be called from any thread. |
| unsafe { trace_unsynchronized(cb) }; |
| } |
| |
| pub fn resolve_addr(ptr: *mut c_void) -> Frame { |
| // SAFETY: Miri will stop execution with an error if this pointer |
| // is invalid. |
| let frame: MiriFrame = unsafe { miri_resolve_frame(ptr as *mut (), 0) }; |
| Frame { |
| addr: ptr, |
| inner: frame, |
| } |
| } |
| |
| pub unsafe fn trace_unsynchronized<F: FnMut(&super::Frame) -> bool>(mut cb: F) { |
| let frames = miri_get_backtrace(0); |
| for ptr in frames.iter() { |
| let frame = resolve_addr(*ptr as *mut c_void); |
| cb(&super::Frame { inner: frame }); |
| } |
| } |