Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 71 insertions, 0 deletions

diff --git a/vendor/backtrace/src/symbolize/gimli/libs_dl_iterate_phdr.rs b/vendor/backtrace/src/symbolize/gimli/libs_dl_iterate_phdr.rs
new file mode 100644
index 0000000..9f0304c
--- /dev/null
+++ b/vendor/backtrace/src/symbolize/gimli/libs_dl_iterate_phdr.rs
@@ -0,0 +1,71 @@
+// Other Unix (e.g. Linux) platforms use ELF as an object file format
+// and typically implement an API called `dl_iterate_phdr` to load
+// native libraries.
+
+use super::mystd::borrow::ToOwned;
+use super::mystd::env;
+use super::mystd::ffi::{CStr, OsStr};
+use super::mystd::os::unix::prelude::*;
+use super::{Library, LibrarySegment, OsString, Vec};
+use core::slice;
+
+pub(super) fn native_libraries() -> Vec<Library> {
+    let mut ret = Vec::new();
+    unsafe {
+        libc::dl_iterate_phdr(Some(callback), &mut ret as *mut Vec<_> as *mut _);
+    }
+    return ret;
+}
+
+fn infer_current_exe(base_addr: usize) -> OsString {
+    if let Ok(entries) = super::parse_running_mmaps::parse_maps() {
+        let opt_path = entries
+            .iter()
+            .find(|e| e.ip_matches(base_addr) && e.pathname().len() > 0)
+            .map(|e| e.pathname())
+            .cloned();
+        if let Some(path) = opt_path {
+            return path;
+        }
+    }
+    env::current_exe().map(|e| e.into()).unwrap_or_default()
+}
+
+// `info` should be a valid pointers.
+// `vec` should be a valid pointer to a `std::Vec`.
+unsafe extern "C" fn callback(
+    info: *mut libc::dl_phdr_info,
+    _size: libc::size_t,
+    vec: *mut libc::c_void,
+) -> libc::c_int {
+    let info = &*info;
+    let libs = &mut *(vec as *mut Vec<Library>);
+    let is_main_prog = info.dlpi_name.is_null() || *info.dlpi_name == 0;
+    let name = if is_main_prog {
+        // The man page for dl_iterate_phdr says that the first object visited by
+        // callback is the main program; so the first time we encounter a
+        // nameless entry, we can assume its the main program and try to infer its path.
+        // After that, we cannot continue that assumption, and we use an empty string.
+        if libs.is_empty() {
+            infer_current_exe(info.dlpi_addr as usize)
+        } else {
+            OsString::new()
+        }
+    } else {
+        let bytes = CStr::from_ptr(info.dlpi_name).to_bytes();
+        OsStr::from_bytes(bytes).to_owned()
+    };
+    let headers = slice::from_raw_parts(info.dlpi_phdr, info.dlpi_phnum as usize);
+    libs.push(Library {
+        name,
+        segments: headers
+            .iter()
+            .map(|header| LibrarySegment {
+                len: (*header).p_memsz as usize,
+                stated_virtual_memory_address: (*header).p_vaddr as usize,
+            })
+            .collect(),
+        bias: info.dlpi_addr as usize,
+    });
+    0
+}