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builtin: print libbacktrace output to stderr, on panics/segfault crash (#14434)
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@ -55,7 +55,7 @@ fn panic_debug(line_no int, file string, mod string, fn_name string, s string) {
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C.exit(1)
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C.exit(1)
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}
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}
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$if use_libbacktrace ? {
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$if use_libbacktrace ? {
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print_libbacktrace(1)
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eprint_libbacktrace(1)
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} $else {
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} $else {
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print_backtrace_skipping_top_frames(1)
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print_backtrace_skipping_top_frames(1)
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}
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}
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@ -106,7 +106,7 @@ pub fn panic(s string) {
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C.exit(1)
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C.exit(1)
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}
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}
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$if use_libbacktrace ? {
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$if use_libbacktrace ? {
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print_libbacktrace(1)
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eprint_libbacktrace(1)
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} $else {
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} $else {
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print_backtrace_skipping_top_frames(1)
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print_backtrace_skipping_top_frames(1)
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}
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}
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@ -130,6 +130,10 @@ pub:
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[markused]
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[markused]
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fn v_segmentation_fault_handler(signal int) {
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fn v_segmentation_fault_handler(signal int) {
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eprintln('signal 11: segmentation fault')
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eprintln('signal 11: segmentation fault')
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print_backtrace()
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$if use_libbacktrace ? {
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eprint_libbacktrace(1)
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} $else {
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print_backtrace()
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}
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exit(128 + 11)
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exit(128 + 11)
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}
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}
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@ -33,11 +33,11 @@ fn init_bt_state() &C.backtrace_state {
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}
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}
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// for bt_error_callback
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// for bt_error_callback
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// struct BacktraceData {
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struct BacktraceOptions {
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// state &C.backtrace_state
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stdin bool = true
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// }
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}
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fn bt_print_callback(data voidptr, pc voidptr, filename_ptr &char, line int, fn_name_ptr &char) int {
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fn bt_print_callback(data &BacktraceOptions, pc voidptr, filename_ptr &char, line int, fn_name_ptr &char) int {
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filename := if isnil(filename_ptr) { '???' } else { unsafe { filename_ptr.vstring() } }
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filename := if isnil(filename_ptr) { '???' } else { unsafe { filename_ptr.vstring() } }
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fn_name := if isnil(fn_name_ptr) {
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fn_name := if isnil(fn_name_ptr) {
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'???'
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'???'
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@ -46,7 +46,12 @@ fn bt_print_callback(data voidptr, pc voidptr, filename_ptr &char, line int, fn_
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}
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}
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// keep it for later
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// keep it for later
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// pc_64 := u64(pc)
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// pc_64 := u64(pc)
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println('$filename:$line: by $fn_name')
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bt_str := '$filename:$line: by $fn_name'
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if data.stdin {
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println(bt_str)
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} else {
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eprintln(bt_str)
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}
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return 0
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return 0
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}
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}
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@ -81,6 +86,15 @@ fn print_libbacktrace(frames_to_skip int) {
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$if no_backtrace ? {
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$if no_backtrace ? {
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return
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return
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}
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}
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// data := &BacktraceData{bt_state}
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data := &BacktraceOptions{}
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C.backtrace_full(bt_state, frames_to_skip, bt_print_callback, bt_error_callback, 0)
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C.backtrace_full(bt_state, frames_to_skip, bt_print_callback, bt_error_callback, data)
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}
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[noinline]
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fn eprint_libbacktrace(frames_to_skip int) {
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$if no_backtrace ? {
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return
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}
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data := &BacktraceOptions{stdin: false}
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C.backtrace_full(bt_state, frames_to_skip, bt_print_callback, bt_error_callback, data)
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}
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}
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@ -2,3 +2,7 @@ module builtin
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fn print_libbacktrace(frames_to_skip int) {
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fn print_libbacktrace(frames_to_skip int) {
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}
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}
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[noinline]
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fn eprint_libbacktrace(frames_to_skip int) {
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}
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