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#![allow(bad_style)]
use std::ffi::{CStr, OsStr};
use std::mem;
use std::os::raw::{c_void, c_char, c_int};
use std::os::unix::prelude::*;
use std::path::Path;
use std::ptr;
use std::sync::atomic::ATOMIC_USIZE_INIT;
use libc::{self, Dl_info};
use SymbolName;
use dylib::Dylib;
use dylib::Symbol as DylibSymbol;
#[repr(C)]
#[derive(Copy, Clone, PartialEq)]
pub struct CSTypeRef {
cpp_data: *const c_void,
cpp_obj: *const c_void
}
const CS_NOW: u64 = 0x80000000;
const CSREF_NULL: CSTypeRef = CSTypeRef {
cpp_data: 0 as *const c_void,
cpp_obj: 0 as *const c_void,
};
pub enum Symbol {
Core {
path: *const c_char,
lineno: u32,
name: *const c_char,
addr: *mut c_void,
},
Dladdr(Dl_info),
}
impl Symbol {
pub fn name(&self) -> Option<SymbolName> {
let name = match *self {
Symbol::Core { name, .. } => name,
Symbol::Dladdr(ref info) => info.dli_sname,
};
if name.is_null() {
None
} else {
Some(SymbolName::new(unsafe {
CStr::from_ptr(name).to_bytes()
}))
}
}
pub fn addr(&self) -> Option<*mut c_void> {
match *self {
Symbol::Core { addr, .. } => Some(addr),
Symbol::Dladdr(ref info) => Some(info.dli_saddr as *mut _),
}
}
pub fn filename(&self) -> Option<&Path> {
match *self {
Symbol::Core { path, .. } => {
if path.is_null() {
None
} else {
Some(Path::new(OsStr::from_bytes(unsafe {
CStr::from_ptr(path).to_bytes()
})))
}
}
Symbol::Dladdr(_) => None,
}
}
pub fn lineno(&self) -> Option<u32> {
match *self {
Symbol::Core { lineno: 0, .. } => None,
Symbol::Core { lineno, .. } => Some(lineno),
Symbol::Dladdr(_) => None,
}
}
}
static CORESYMBOLICATION: Dylib = Dylib { init: ATOMIC_USIZE_INIT };
macro_rules! dlsym {
(extern {
$(fn $name:ident($($arg:ident: $t:ty),*) -> $ret:ty;)*
}) => ($(
static $name: ::dylib::Symbol<unsafe extern fn($($t),*) -> $ret> =
::dylib::Symbol {
name: concat!(stringify!($name), "\0"),
addr: ::std::sync::atomic::ATOMIC_USIZE_INIT,
_marker: ::std::marker::PhantomData,
};
)*)
}
dlsym! {
extern {
fn CSSymbolicatorCreateWithPid(pid: c_int) -> CSTypeRef;
fn CSRelease(rf: CSTypeRef) -> c_void;
fn CSSymbolicatorGetSymbolWithAddressAtTime(
cs: CSTypeRef, addr: *const c_void, time: u64) -> CSTypeRef;
fn CSSymbolicatorGetSourceInfoWithAddressAtTime(
cs: CSTypeRef, addr: *const c_void, time: u64) -> CSTypeRef;
fn CSSourceInfoGetLineNumber(info: CSTypeRef) -> c_int;
fn CSSourceInfoGetPath(info: CSTypeRef) -> *const c_char;
fn CSSourceInfoGetSymbol(info: CSTypeRef) -> CSTypeRef;
fn CSSymbolGetMangledName(sym: CSTypeRef) -> *const c_char;
fn CSSymbolGetSymbolOwner(sym: CSTypeRef) -> CSTypeRef;
fn CSSymbolOwnerGetBaseAddress(symowner: CSTypeRef) -> *mut c_void;
}
}
unsafe fn get<T>(sym: &DylibSymbol<T>) -> &T {
CORESYMBOLICATION.get(sym).unwrap()
}
unsafe fn try_resolve(addr: *mut c_void, cb: &mut FnMut(&super::Symbol)) -> bool {
let path = "/System/Library/PrivateFrameworks/CoreSymbolication.framework\
/Versions/A/CoreSymbolication";
if !CORESYMBOLICATION.init(path) {
return false;
}
let cs = get(&CSSymbolicatorCreateWithPid)(libc::getpid());
if cs == CSREF_NULL {
return false
}
let info = get(&CSSymbolicatorGetSourceInfoWithAddressAtTime)(
cs, addr, CS_NOW);
let sym = if info == CSREF_NULL {
get(&CSSymbolicatorGetSymbolWithAddressAtTime)(cs, addr, CS_NOW)
} else {
get(&CSSourceInfoGetSymbol)(info)
};
let mut rv = false;
if sym != CSREF_NULL {
let owner = get(&CSSymbolGetSymbolOwner)(sym);
if owner != CSREF_NULL {
cb(&super::Symbol {
inner: Symbol::Core {
path: if info != CSREF_NULL {
get(&CSSourceInfoGetPath)(info)
} else {
ptr::null()
},
lineno: if info != CSREF_NULL {
get(&CSSourceInfoGetLineNumber)(info) as u32
} else {
0
},
name: get(&CSSymbolGetMangledName)(sym),
addr: get(&CSSymbolOwnerGetBaseAddress)(owner),
},
});
rv = true;
}
}
get(&CSRelease)(cs);
rv
}
pub fn resolve(addr: *mut c_void, cb: &mut FnMut(&super::Symbol)) {
unsafe {
if try_resolve(addr, cb) {
return
}
let mut info: Dl_info = mem::zeroed();
if libc::dladdr(addr as *mut _, &mut info) != 0 {
cb(&super::Symbol {
inner: Symbol::Dladdr(info),
});
}
}
}