std\backtrace\src\symbolize\gimli/
mmap_windows.rs1use super::super::super::windows_sys::*;
2
3use super::mystd::fs::File;
4use super::mystd::os::windows::prelude::*;
5use core::ffi::c_void;
6use core::ops::Deref;
7use core::ptr;
8use core::slice;
9
10pub struct Mmap {
11 _file: File,
14 ptr: *mut c_void,
15 len: usize,
16}
17
18impl Mmap {
19 pub unsafe fn map(file: &File, len: usize, offset: u64) -> Option<Mmap> {
20 unsafe {
21 let file = file.try_clone().ok()?;
22 let mapping = CreateFileMappingA(
23 file.as_raw_handle(),
24 ptr::null_mut(),
25 PAGE_READONLY,
26 0,
27 0,
28 ptr::null(),
29 );
30 if mapping.is_null() {
31 return None;
32 }
33 let ptr = MapViewOfFile(
34 mapping,
35 FILE_MAP_READ,
36 (offset >> 32) as u32,
37 offset as u32,
38 len,
39 );
40 CloseHandle(mapping);
41 if ptr.Value.is_null() {
42 return None;
43 }
44 Some(Mmap {
45 _file: file,
46 ptr: ptr.Value,
47 len,
48 })
49 }
50 }
51}
52impl Deref for Mmap {
53 type Target = [u8];
54
55 fn deref(&self) -> &[u8] {
56 unsafe { slice::from_raw_parts(self.ptr.cast_const().cast::<u8>(), self.len) }
57 }
58}
59
60impl Drop for Mmap {
61 fn drop(&mut self) {
62 unsafe {
63 let r = UnmapViewOfFile(MEMORY_MAPPED_VIEW_ADDRESS { Value: self.ptr });
64 debug_assert!(r != 0);
65 }
66 }
67}