| // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| //! Common support for resolving with `dladdr`, often used as a fallback if |
| //! other strategies don't work. |
| |
| #![allow(dead_code)] |
| |
| cfg_if::cfg_if! { |
| if #[cfg(all(unix, not(target_os = "emscripten"), feature = "dladdr"))] { |
| use core::ffi::c_void; |
| use core::marker; |
| use core::{mem, slice}; |
| use crate::SymbolName; |
| use crate::types::BytesOrWideString; |
| use libc::{self, Dl_info}; |
| |
| pub struct Symbol<'a> { |
| inner: Dl_info, |
| _marker: marker::PhantomData<&'a i32>, |
| } |
| |
| impl Symbol<'_> { |
| pub fn name(&self) -> Option<SymbolName> { |
| if self.inner.dli_sname.is_null() { |
| None |
| } else { |
| let ptr = self.inner.dli_sname as *const u8; |
| unsafe { |
| let len = libc::strlen(self.inner.dli_sname); |
| Some(SymbolName::new(slice::from_raw_parts(ptr, len))) |
| } |
| } |
| } |
| |
| pub fn addr(&self) -> Option<*mut c_void> { |
| Some(self.inner.dli_saddr as *mut _) |
| } |
| |
| pub fn filename_raw(&self) -> Option<BytesOrWideString> { |
| None |
| } |
| |
| #[cfg(feature = "std")] |
| pub fn filename(&self) -> Option<&::std::path::Path> { |
| None |
| } |
| |
| pub fn lineno(&self) -> Option<u32> { |
| None |
| } |
| } |
| |
| pub unsafe fn resolve(addr: *mut c_void, cb: &mut FnMut(Symbol<'static>)) { |
| let mut info = Symbol { |
| inner: mem::zeroed(), |
| _marker: marker::PhantomData, |
| }; |
| // Skip null addresses to avoid calling into libc and having it do |
| // things with the dynamic symbol table for no reason. |
| if !addr.is_null() && libc::dladdr(addr as *mut _, &mut info.inner) != 0 { |
| cb(info) |
| } |
| } |
| } else { |
| use core::ffi::c_void; |
| use core::marker; |
| use crate::symbolize::SymbolName; |
| use crate::types::BytesOrWideString; |
| |
| pub struct Symbol<'a> { |
| a: Void, |
| _b: marker::PhantomData<&'a i32>, |
| } |
| |
| enum Void {} |
| |
| impl Symbol<'_> { |
| pub fn name(&self) -> Option<SymbolName> { |
| match self.a {} |
| } |
| |
| pub fn addr(&self) -> Option<*mut c_void> { |
| match self.a {} |
| } |
| |
| pub fn filename_raw(&self) -> Option<BytesOrWideString> { |
| match self.a {} |
| } |
| |
| #[cfg(feature = "std")] |
| pub fn filename(&self) -> Option<&::std::path::Path> { |
| match self.a {} |
| } |
| |
| pub fn lineno(&self) -> Option<u32> { |
| match self.a {} |
| } |
| } |
| |
| pub unsafe fn resolve(addr: *mut c_void, cb: &mut FnMut(Symbol<'static>)) { |
| drop((addr, cb)); |
| } |
| } |
| } |