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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/backtrace/src/symbolize/gimli/libs_macos.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip
Deleted vendor folder
Diffstat (limited to 'vendor/backtrace/src/symbolize/gimli/libs_macos.rs')
-rw-r--r--vendor/backtrace/src/symbolize/gimli/libs_macos.rs146
1 files changed, 0 insertions, 146 deletions
diff --git a/vendor/backtrace/src/symbolize/gimli/libs_macos.rs b/vendor/backtrace/src/symbolize/gimli/libs_macos.rs
deleted file mode 100644
index 438bbff..0000000
--- a/vendor/backtrace/src/symbolize/gimli/libs_macos.rs
+++ /dev/null
@@ -1,146 +0,0 @@
-#![allow(deprecated)]
-
-use super::mystd::ffi::{CStr, OsStr};
-use super::mystd::os::unix::prelude::*;
-use super::mystd::prelude::v1::*;
-use super::{Library, LibrarySegment};
-use core::convert::TryInto;
-use core::mem;
-
-pub(super) fn native_libraries() -> Vec<Library> {
- let mut ret = Vec::new();
- let images = unsafe { libc::_dyld_image_count() };
- for i in 0..images {
- ret.extend(native_library(i));
- }
- return ret;
-}
-
-fn native_library(i: u32) -> Option<Library> {
- use object::macho;
- use object::read::macho::{MachHeader, Segment};
- use object::NativeEndian;
-
- // Fetch the name of this library which corresponds to the path of
- // where to load it as well.
- let name = unsafe {
- let name = libc::_dyld_get_image_name(i);
- if name.is_null() {
- return None;
- }
- CStr::from_ptr(name)
- };
-
- // Load the image header of this library and delegate to `object` to
- // parse all the load commands so we can figure out all the segments
- // involved here.
- let (mut load_commands, endian) = unsafe {
- let header = libc::_dyld_get_image_header(i);
- if header.is_null() {
- return None;
- }
- match (*header).magic {
- macho::MH_MAGIC => {
- let endian = NativeEndian;
- let header = &*(header as *const macho::MachHeader32<NativeEndian>);
- let data = core::slice::from_raw_parts(
- header as *const _ as *const u8,
- mem::size_of_val(header) + header.sizeofcmds.get(endian) as usize,
- );
- (header.load_commands(endian, data, 0).ok()?, endian)
- }
- macho::MH_MAGIC_64 => {
- let endian = NativeEndian;
- let header = &*(header as *const macho::MachHeader64<NativeEndian>);
- let data = core::slice::from_raw_parts(
- header as *const _ as *const u8,
- mem::size_of_val(header) + header.sizeofcmds.get(endian) as usize,
- );
- (header.load_commands(endian, data, 0).ok()?, endian)
- }
- _ => return None,
- }
- };
-
- // Iterate over the segments and register known regions for segments
- // that we find. Additionally record information bout text segments
- // for processing later, see comments below.
- let mut segments = Vec::new();
- let mut first_text = 0;
- let mut text_fileoff_zero = false;
- while let Some(cmd) = load_commands.next().ok()? {
- if let Some((seg, _)) = cmd.segment_32().ok()? {
- if seg.name() == b"__TEXT" {
- first_text = segments.len();
- if seg.fileoff(endian) == 0 && seg.filesize(endian) > 0 {
- text_fileoff_zero = true;
- }
- }
- segments.push(LibrarySegment {
- len: seg.vmsize(endian).try_into().ok()?,
- stated_virtual_memory_address: seg.vmaddr(endian).try_into().ok()?,
- });
- }
- if let Some((seg, _)) = cmd.segment_64().ok()? {
- if seg.name() == b"__TEXT" {
- first_text = segments.len();
- if seg.fileoff(endian) == 0 && seg.filesize(endian) > 0 {
- text_fileoff_zero = true;
- }
- }
- segments.push(LibrarySegment {
- len: seg.vmsize(endian).try_into().ok()?,
- stated_virtual_memory_address: seg.vmaddr(endian).try_into().ok()?,
- });
- }
- }
-
- // Determine the "slide" for this library which ends up being the
- // bias we use to figure out where in memory objects are loaded.
- // This is a bit of a weird computation though and is the result of
- // trying a few things in the wild and seeing what sticks.
- //
- // The general idea is that the `bias` plus a segment's
- // `stated_virtual_memory_address` is going to be where in the
- // actual address space the segment resides. The other thing we rely
- // on though is that a real address minus the `bias` is the index to
- // look up in the symbol table and debuginfo.
- //
- // It turns out, though, that for system loaded libraries these
- // calculations are incorrect. For native executables, however, it
- // appears correct. Lifting some logic from LLDB's source it has
- // some special-casing for the first `__TEXT` section loaded from
- // file offset 0 with a nonzero size. For whatever reason when this
- // is present it appears to mean that the symbol table is relative
- // to just the vmaddr slide for the library. If it's *not* present
- // then the symbol table is relative to the vmaddr slide plus the
- // segment's stated address.
- //
- // To handle this situation if we *don't* find a text section at
- // file offset zero then we increase the bias by the first text
- // sections's stated address and decrease all stated addresses by
- // that amount as well. That way the symbol table is always appears
- // relative to the library's bias amount. This appears to have the
- // right results for symbolizing via the symbol table.
- //
- // Honestly I'm not entirely sure whether this is right or if
- // there's something else that should indicate how to do this. For
- // now though this seems to work well enough (?) and we should
- // always be able to tweak this over time if necessary.
- //
- // For some more information see #318
- let mut slide = unsafe { libc::_dyld_get_image_vmaddr_slide(i) as usize };
- if !text_fileoff_zero {
- let adjust = segments[first_text].stated_virtual_memory_address;
- for segment in segments.iter_mut() {
- segment.stated_virtual_memory_address -= adjust;
- }
- slide += adjust;
- }
-
- Some(Library {
- name: OsStr::from_bytes(name.to_bytes()).to_owned(),
- segments,
- bias: slide,
- })
-}