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v/vlib/builtin/builtin_d_use_libbacktrace.c.v

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[has_globals]
module builtin
#flag -I@VEXEROOT/thirdparty/libbacktrace
#flag @VEXEROOT/thirdparty/libbacktrace/backtrace.o
#include <backtrace.h>
// NOTE: Don't mark this as a [typedef] or it may cause compiler errors!
struct C.backtrace_state {
// filename &char
}
type BacktraceErrorCallback = fn (data voidptr, msg &char, errnum int) voidptr
type BacktraceFullCallback = fn (data voidptr, pc voidptr, filename &char, lineno int, func &char) &int
fn C.backtrace_create_state(filename &char, threaded int, error_callback BacktraceErrorCallback, data voidptr) &C.backtrace_state
fn C.backtrace_full(state &C.backtrace_state, skip int, cb BacktraceFullCallback, err_cb BacktraceErrorCallback, data voidptr) int
__global bt_state = init_bt_state()
fn init_bt_state() &C.backtrace_state {
$if !tinyc {
mut filename := &char(0)
$if windows {
filename = unsafe { string_from_wide(&&u16(g_main_argv)[0]).str }
} $else {
filename = unsafe { &&char(g_main_argv)[0] }
}
return C.backtrace_create_state(filename, 1, bt_error_handler, 0)
}
return &C.backtrace_state(0)
}
// for bt_error_callback
// struct BacktraceData {
// state &C.backtrace_state
// }
fn bt_print_callback(data voidptr, pc voidptr, filename_ptr &char, line int, fn_name_ptr &char) int {
filename := if isnil(filename_ptr) { '???' } else { unsafe { filename_ptr.vstring() } }
fn_name := if isnil(fn_name_ptr) {
'???'
} else {
(unsafe { fn_name_ptr.vstring() }).replace('__', '.')
}
// keep it for later
// pc_64 := u64(pc)
println('$filename:$line: by $fn_name')
return 0
}
fn bt_error_callback(data voidptr, msg_ptr &char, errnum int) {
// if !isnil(data) && !isnil(data.state) && !isnil(data.state.filename) {
// filename := unsafe{ data.state.filename.vstring() }
// eprint('$filename: ')
// }
msg := unsafe { msg_ptr.vstring() }
eprint('libbacktrace: $msg')
if errnum > 0 {
eprint(': ${C.strerror(errnum)}')
}
eprintln('')
}
// for backtrace_create_state only
fn bt_error_handler(data voidptr, msg &char, errnum int) {
eprint('libbacktrace: ')
eprint(unsafe { msg.vstring() })
if errnum > 0 {
eprint(': ${C.strerror(errnum)}')
}
eprintln('')
exit(1)
}
[noinline]
fn print_libbacktrace(frames_to_skip int) {
$if no_backtrace ? {
return
}
// data := &BacktraceData{bt_state}
C.backtrace_full(bt_state, frames_to_skip, bt_print_callback, bt_error_callback, 0)
}