95 lines
3.1 KiB
V
95 lines
3.1 KiB
V
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module builtin
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pub fn println(s string) {
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C.printf('%.*s\n', s.len, s.str)
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}
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fn print_backtrace_skipping_top_frames_msvc(skipframes int) bool {
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println('not implemented, see builtin_windows.v')
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return false
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}
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fn print_backtrace_skipping_top_frames_mingw(skipframes int) bool {
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println('not implemented, see builtin_windows.v')
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return false
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}
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fn print_backtrace_skipping_top_frames_nix(xskipframes int) bool {
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skipframes := xskipframes + 2
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$if macos { return print_backtrace_skipping_top_frames_mac(skipframes) }
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$if linux { return print_backtrace_skipping_top_frames_linux(skipframes) }
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$if freebsd { return print_backtrace_skipping_top_frames_freebsd(skipframes) }
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return false
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}
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// the functions below are not called outside this file,
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// so there is no need to have their twins in builtin_windows.v
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fn print_backtrace_skipping_top_frames_mac(skipframes int) bool {
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$if macos {
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buffer := [100]byteptr
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nr_ptrs := C.backtrace(*voidptr(buffer), 100)
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C.backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_ptrs-skipframes, 1)
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}
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return true
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}
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fn print_backtrace_skipping_top_frames_freebsd(skipframes int) bool {
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$if freebsd {
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buffer := [100]byteptr
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nr_ptrs := C.backtrace(*voidptr(buffer), 100)
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C.backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_ptrs-skipframes, 1)
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}
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return true
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}
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fn print_backtrace_skipping_top_frames_linux(skipframes int) bool {
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$if tinyc {
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println('TODO: print_backtrace_skipping_top_frames_linux $skipframes with tcc fails tests with "stack smashing detected" .')
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return false
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}
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$if !android { // backtrace is not available on Android.
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$if glibc {
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buffer := [100]byteptr
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nr_ptrs := C.backtrace(*voidptr(buffer), 100)
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nr_actual_frames := nr_ptrs-skipframes
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mut sframes := []string
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csymbols := C.backtrace_symbols(*voidptr(&buffer[skipframes]),
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nr_actual_frames)
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for i in 0..nr_actual_frames { sframes << tos2(csymbols[i]) }
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for sframe in sframes {
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executable := sframe.all_before('(')
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addr := sframe.all_after('[').all_before(']')
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beforeaddr := sframe.all_before('[')
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cmd := 'addr2line -e $executable $addr'
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// taken from os, to avoid depending on the os module inside builtin.v
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f := C.popen(cmd.str, 'r')
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if isnil(f) {
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println(sframe) continue
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}
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buf := [1000]byte
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mut output := ''
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for C.fgets(voidptr(buf), 1000, f) != 0 {
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output += tos(buf, vstrlen(buf))
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}
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output = output.trim_space()+':'
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if 0 != C.pclose(f) {
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println(sframe) continue
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}
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if output in ['??:0:','??:?:'] { output = '' }
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println( '${output:-46s} | ${addr:14s} | $beforeaddr')
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}
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//C.backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_actual_frames, 1)
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return true
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}$else{
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C.printf('backtrace_symbols_fd is missing, so printing backtraces is not available.\n')
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C.printf('Some libc implementations like musl simply do not provide it.\n')
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}
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}
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return false
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}
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