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// Copyright (c) 2019-2021 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
// pub fn vsyscall(id int
//
/*
pub const (
sys_write = 1
sys_mkdir = 83
)
const (
stdin_value = 0
stdout_value = 1
stderr_value = 2
)
*/
fn builtin_init() {
// Do nothing
}
fn print_backtrace_skipping_top_frames(xskipframes int) bool {
$if no_backtrace ? {
return false
} $else {
skipframes := xskipframes + 2
$if macos || freebsd || openbsd || netbsd {
return print_backtrace_skipping_top_frames_bsd(skipframes)
} $else $if linux {
return print_backtrace_skipping_top_frames_linux(skipframes)
} $else {
println('print_backtrace_skipping_top_frames is not implemented. skipframes: $skipframes')
}
}
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_bsd(skipframes int) bool {
$if no_backtrace ? {
return false
} $else {
$if macos || freebsd || openbsd || netbsd {
buffer := [100]voidptr{}
nr_ptrs := C.backtrace(&buffer[0], 100)
if nr_ptrs < 2 {
eprintln('C.backtrace returned less than 2 frames')
return false
}
C.backtrace_symbols_fd(&buffer[skipframes], nr_ptrs - skipframes, 2)
}
return true
}
}
fn C.tcc_backtrace(fmt &char) int
fn print_backtrace_skipping_top_frames_linux(skipframes int) bool {
$if android {
eprintln('On Android no backtrace is available.')
return false
}
$if !glibc {
eprintln('backtrace_symbols is missing => printing backtraces is not available.')
eprintln('Some libc implementations like musl simply do not provide it.')
return false
}
$if no_backtrace ? {
return false
} $else {
$if linux && !freestanding {
$if tinyc {
C.tcc_backtrace(c'Backtrace')
return false
}
buffer := [100]voidptr{}
nr_ptrs := C.backtrace(&buffer[0], 100)
if nr_ptrs < 2 {
eprintln('C.backtrace returned less than 2 frames')
return false
}
nr_actual_frames := nr_ptrs - skipframes
mut sframes := []string{}
//////csymbols := backtrace_symbols(*voidptr(&buffer[skipframes]), nr_actual_frames)
csymbols := C.backtrace_symbols(voidptr(&buffer[skipframes]), nr_actual_frames)
for i in 0 .. nr_actual_frames {
sframes << unsafe { tos2(&byte(csymbols[i])) }
}
for sframe in sframes {
executable := sframe.all_before('(')
addr := sframe.all_after('[').all_before(']')
beforeaddr := sframe.all_before('[')
cmd := 'addr2line -e $executable $addr'
// taken from os, to avoid depending on the os module inside builtin.v
f := C.popen(&char(cmd.str), c'r')
if isnil(f) {
eprintln(sframe)
continue
}
buf := [1000]byte{}
mut output := ''
unsafe {
bp := &buf[0]
for C.fgets(&char(bp), 1000, f) != 0 {
output += tos(bp, vstrlen(bp))
}
}
output = output.trim_space() + ':'
if C.pclose(f) != 0 {
eprintln(sframe)
continue
}
if output in ['??:0:', '??:?:'] {
output = ''
}
// See http://wiki.dwarfstd.org/index.php?title=Path_Discriminators
// NB: it is shortened here to just d. , just so that it fits, and so
// that the common error file:lineno: line format is enforced.
output = output.replace(' (discriminator', ': (d.')
eprintln('${output:-55s} | ${addr:14s} | $beforeaddr')
}
}
}
return true
}
fn break_if_debugger_attached() {
unsafe {
mut ptr := &voidptr(0)
*ptr = voidptr(0)
_ = ptr
}
}
// These functions are Windows specific - provide dummys for *nix
pub fn winapi_lasterr_str() string {
return ''
}
[noreturn]
pub fn panic_lasterr() {}
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