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use ffi::CStr;
use io;
use libc::{c_char, c_ulong};
use mem;
use sys::backtrace::BacktraceContext;
use sys::backtrace::StackWalkVariant;
use sys::c;
use sys::dynamic_lib::DynamicLibrary;
use sys_common::backtrace::Frame;
pub struct PrintingFnsEx {
resolve_symname: SymFromInlineContextFn,
sym_get_line: SymGetLineFromInlineContextFn,
}
pub struct PrintingFns64 {
resolve_symname: SymFromAddrFn,
sym_get_line: SymGetLineFromAddr64Fn,
}
pub fn load_printing_fns_ex(dbghelp: &DynamicLibrary) -> io::Result<PrintingFnsEx> {
Ok(PrintingFnsEx {
resolve_symname: sym!(dbghelp, "SymFromInlineContext", SymFromInlineContextFn)?,
sym_get_line: sym!(
dbghelp,
"SymGetLineFromInlineContext",
SymGetLineFromInlineContextFn
)?,
})
}
pub fn load_printing_fns_64(dbghelp: &DynamicLibrary) -> io::Result<PrintingFns64> {
Ok(PrintingFns64 {
resolve_symname: sym!(dbghelp, "SymFromAddr", SymFromAddrFn)?,
sym_get_line: sym!(dbghelp, "SymGetLineFromAddr64", SymGetLineFromAddr64Fn)?,
})
}
type SymFromAddrFn =
unsafe extern "system" fn(c::HANDLE, u64, *mut u64, *mut c::SYMBOL_INFO) -> c::BOOL;
type SymFromInlineContextFn =
unsafe extern "system" fn(c::HANDLE, u64, c::ULONG, *mut u64, *mut c::SYMBOL_INFO) -> c::BOOL;
type SymGetLineFromAddr64Fn =
unsafe extern "system" fn(c::HANDLE, u64, *mut u32, *mut c::IMAGEHLP_LINE64) -> c::BOOL;
type SymGetLineFromInlineContextFn = unsafe extern "system" fn(
c::HANDLE,
u64,
c::ULONG,
u64,
*mut c::DWORD,
*mut c::IMAGEHLP_LINE64,
) -> c::BOOL;
pub fn resolve_symname<F>(frame: Frame, callback: F, context: &BacktraceContext) -> io::Result<()>
where
F: FnOnce(Option<&str>) -> io::Result<()>,
{
match context.StackWalkVariant {
StackWalkVariant::StackWalkEx(_, ref fns) => resolve_symname_internal(
|process: c::HANDLE,
symbol_address: u64,
inline_context: c::ULONG,
info: *mut c::SYMBOL_INFO| unsafe {
let mut displacement = 0u64;
(fns.resolve_symname)(
process,
symbol_address,
inline_context,
&mut displacement,
info,
)
},
frame,
callback,
context,
),
StackWalkVariant::StackWalk64(_, ref fns) => resolve_symname_internal(
|process: c::HANDLE,
symbol_address: u64,
_inline_context: c::ULONG,
info: *mut c::SYMBOL_INFO| unsafe {
let mut displacement = 0u64;
(fns.resolve_symname)(process, symbol_address, &mut displacement, info)
},
frame,
callback,
context,
),
}
}
fn resolve_symname_internal<F, R>(
mut symbol_resolver: R,
frame: Frame,
callback: F,
context: &BacktraceContext,
) -> io::Result<()>
where
F: FnOnce(Option<&str>) -> io::Result<()>,
R: FnMut(c::HANDLE, u64, c::ULONG, *mut c::SYMBOL_INFO) -> c::BOOL,
{
unsafe {
let mut info: c::SYMBOL_INFO = mem::zeroed();
info.MaxNameLen = c::MAX_SYM_NAME as c_ulong;
info.SizeOfStruct = 88;
let ret = symbol_resolver(
context.handle,
frame.symbol_addr as u64,
frame.inline_context,
&mut info,
);
let valid_range = if ret == c::TRUE && frame.symbol_addr as usize >= info.Address as usize {
if info.Size != 0 {
(frame.symbol_addr as usize) < info.Address as usize + info.Size as usize
} else {
true
}
} else {
false
};
let symname = if valid_range {
let ptr = info.Name.as_ptr() as *const c_char;
CStr::from_ptr(ptr).to_str().ok()
} else {
None
};
callback(symname)
}
}
pub fn foreach_symbol_fileline<F>(
frame: Frame,
callback: F,
context: &BacktraceContext,
) -> io::Result<bool>
where
F: FnMut(&[u8], u32) -> io::Result<()>,
{
match context.StackWalkVariant {
StackWalkVariant::StackWalkEx(_, ref fns) => foreach_symbol_fileline_iternal(
|process: c::HANDLE,
frame_address: u64,
inline_context: c::ULONG,
line: *mut c::IMAGEHLP_LINE64| unsafe {
let mut displacement = 0u32;
(fns.sym_get_line)(
process,
frame_address,
inline_context,
0,
&mut displacement,
line,
)
},
frame,
callback,
context,
),
StackWalkVariant::StackWalk64(_, ref fns) => foreach_symbol_fileline_iternal(
|process: c::HANDLE,
frame_address: u64,
_inline_context: c::ULONG,
line: *mut c::IMAGEHLP_LINE64| unsafe {
let mut displacement = 0u32;
(fns.sym_get_line)(process, frame_address, &mut displacement, line)
},
frame,
callback,
context,
),
}
}
fn foreach_symbol_fileline_iternal<F, G>(
mut line_getter: G,
frame: Frame,
mut callback: F,
context: &BacktraceContext,
) -> io::Result<bool>
where
F: FnMut(&[u8], u32) -> io::Result<()>,
G: FnMut(c::HANDLE, u64, c::ULONG, *mut c::IMAGEHLP_LINE64) -> c::BOOL,
{
unsafe {
let mut line: c::IMAGEHLP_LINE64 = mem::zeroed();
line.SizeOfStruct = ::mem::size_of::<c::IMAGEHLP_LINE64>() as u32;
let ret = line_getter(
context.handle,
frame.exact_position as u64,
frame.inline_context,
&mut line,
);
if ret == c::TRUE {
let name = CStr::from_ptr(line.Filename).to_bytes();
callback(name, line.LineNumber as u32)?;
}
Ok(false)
}
}