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v/vlib/builtin/builtin_nix.v

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