137 lines
3.7 KiB
V
137 lines
3.7 KiB
V
// Copyright (c) 2019-2020 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 vsyscall(id int
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//
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/*
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pub const (
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sys_write = 1
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sys_mkdir = 83
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)
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const (
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stdin_value = 0
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stdout_value = 1
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stderr_value = 2
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)
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fn C.puts(charptr)
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*/
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fn builtin_init() {
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// Do nothing
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}
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pub fn println(s string) {
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// TODO: a syscall sys_write on linux works, except for the v repl.
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// Probably it is a stdio buffering issue. Needs more testing...
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// $if linux {
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// $if !android {
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// snl := s + '\n'
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// C.syscall(/* sys_write */ 1, /* stdout_value */ 1, snl.str, s.len+1)
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// return
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// }
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// }
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C.printf('%.*s\n', s.len, s.str)
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}
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fn print_backtrace_skipping_top_frames(xskipframes int) bool {
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skipframes := xskipframes + 2
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$if macos {
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return print_backtrace_skipping_top_frames_mac(skipframes)
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}
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$if linux {
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return print_backtrace_skipping_top_frames_linux(skipframes)
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}
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$if freebsd {
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return print_backtrace_skipping_top_frames_freebsd(skipframes)
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}
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$if netbsd {
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return print_backtrace_skipping_top_frames_freebsd(skipframes)
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}
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$if openbsd {
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return print_backtrace_skipping_top_frames_freebsd(skipframes)
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}
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println('print_backtrace_skipping_top_frames is not implemented. skipframes: $skipframes')
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return false
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}
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// the functions below are not called outside this file,
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// so there is no need to have their twins in builtin_windows.v
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fn print_backtrace_skipping_top_frames_mac(skipframes int) bool {
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$if macos {
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buffer := [100]byteptr
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nr_ptrs := C.backtrace(buffer, 100)
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C.backtrace_symbols_fd(&buffer[skipframes], nr_ptrs - skipframes, 2)
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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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$if freebsd {
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buffer := [100]byteptr
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nr_ptrs := C.backtrace(buffer, 100)
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C.backtrace_symbols_fd(&buffer[skipframes], nr_ptrs - skipframes, 2)
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}
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return true
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}
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fn print_backtrace_skipping_top_frames_linux(skipframes int) bool {
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$if android {
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eprintln('On Android no backtrace is available.')
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return false
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}
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$if !glibc {
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eprintln('backtrace_symbols is missing => printing backtraces is not available.')
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eprintln('Some libc implementations like musl simply do not provide it.')
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return false
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}
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$if tinyc {
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eprintln('TODO: print_backtrace_skipping_top_frames_linux $skipframes')
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eprintln('with tcc fails tests with "stack smashing detected" .')
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return false
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}
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buffer := [100]byteptr
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nr_ptrs := C.backtrace(buffer, 100)
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nr_actual_frames := nr_ptrs - skipframes
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mut sframes := []string{}
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//////csymbols := backtrace_symbols(*voidptr(&buffer[skipframes]), nr_actual_frames)
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csymbols := C.backtrace_symbols(&buffer[skipframes], nr_actual_frames)
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for i in 0 .. nr_actual_frames {
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sframes << tos2( byteptr(csymbols[i]) )
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}
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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 $addr'
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// taken from os, to avoid depending on the os module inside builtin.v
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f := C.popen(cmd.str, 'r')
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if isnil(f) {
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eprintln(sframe)
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continue
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}
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buf := [1000]byte
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mut output := ''
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for C.fgets(charptr(buf), 1000, f) != 0 {
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output += tos(buf, vstrlen(buf))
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}
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output = output.trim_space() + ':'
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if C.pclose(f) != 0 {
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eprintln(sframe)
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continue
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}
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if output in ['??:0:', '??:?:'] {
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output = ''
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}
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// See http://wiki.dwarfstd.org/index.php?title=Path_Discriminators
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// NB: it is shortened here to just d. , just so that it fits, and so
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// that the common error file:lineno: line format is enforced.
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output = output.replace(' (discriminator', ': (d.')
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eprintln('${output:-46s} | ${addr:14s} | $beforeaddr')
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}
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return true
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}
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