v/vlib/builtin/builtin.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.
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module builtin
fn init() {
$if windows {
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if is_atty(0) > 0 {
C._setmode(C._fileno(C.stdin), C._O_U16TEXT)
} else {
C._setmode(C._fileno(C.stdin), C._O_U8TEXT)
}
C._setmode(C._fileno(C.stdout), C._O_U8TEXT)
C.SetConsoleMode(C.GetStdHandle(C.STD_OUTPUT_HANDLE), C.ENABLE_PROCESSED_OUTPUT | 0x0004) // ENABLE_VIRTUAL_TERMINAL_PROCESSING
C.setbuf(C.stdout,0)
}
}
pub fn exit(code int) {
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C.exit(code)
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}
// isnil returns true if an object is nil (only for C objects).
pub fn isnil(v voidptr) bool {
return v == 0
}
fn on_panic(f fn (int) int) {
// TODO
}
pub fn print_backtrace_skipping_top_frames(skipframes int) {
$if mac {
buffer := [100]byteptr
nr_ptrs := C.backtrace(*voidptr(buffer), 100)
C.backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_ptrs-skipframes, 1)
return
}
$if linux {
$if !android {
$if glibc {
// backtrace is not available on Android.
//if C.backtrace_symbols_fd != 0 {
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(']')
cmd := 'addr2line -e $executable $addr'
// taken from os, to avoid depending on the os module inside builtin.v
f := C.popen(cmd.str, 'r')
if isnil(f) {
println(sframe) continue
}
buf := [1000]byte
mut output := ''
for C.fgets(voidptr(buf), 1000, f) != 0 {
output += tos(buf, vstrlen(buf))
}
output = output.trim_space()+':'
if 0 != int(C.pclose(f)) {
println(sframe) continue
}
println( '${output:-45s} | $sframe')
}
//C.backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_actual_frames, 1)
return
}$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')
}
}
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}
println('print_backtrace_skipping_top_frames is not implemented on this platform for now...\n')
}
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pub fn print_backtrace(){
// at the time of backtrace_symbols_fd call, the C stack would look something like this:
// 1 frame for print_backtrace_skipping_top_frames
// 1 frame for print_backtrace itself
// ... print the rest of the backtrace frames ...
// => top 2 frames should be skipped, since they will not be informative to the developer
print_backtrace_skipping_top_frames(2)
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}
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// replaces panic when -debug arg is passed
fn panic_debug(line_no int, file, mod, fn_name, s string) {
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println('================ V panic ================')
println(' module: $mod')
println(' function: ${fn_name}()')
println(' file: $file')
println(' line: ' + line_no.str())
println(' message: $s')
println('=========================================')
print_backtrace_skipping_top_frames(1)
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C.exit(1)
}
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pub fn panic(s string) {
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println('V panic: $s')
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print_backtrace()
C.exit(1)
}
pub fn println(s string) {
// Should never happen
if isnil(s.str) {
panic('println(NIL)')
}
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$if windows {
C._putws(s.to_wide())
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} $else {
C.printf('%.*s\n', s.len, s.str)
}
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}
pub fn eprintln(s string) {
if isnil(s.str) {
panic('eprintln(NIL)')
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}
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$if mac {
C.fprintf(stderr, '%.*s\n', s.len, s.str)
C.fflush(stderr)
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return
}
$if linux {
C.fprintf(stderr, '%.*s\n', s.len, s.str)
C.fflush(stderr)
return
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}
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// TODO issues with stderr and cross compiling for Linux
println(s)
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}
pub fn print(s string) {
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$if windows {
C.wprintf(s.to_wide())
} $else {
C.printf('%.*s', s.len, s.str)
}
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}
__global total_m i64 = 0
//__global nr_mallocs int = 0
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[unsafe_fn]
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pub fn malloc(n int) byteptr {
if n < 0 {
panic('malloc(<0)')
}
//nr_mallocs++
/*
TODO
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#ifdef VPLAY
if n > 10000 {
panic('allocating more than 10 KB is not allowed in the playground')
}
#endif
#ifdef DEBUG_ALLOC
total_m += n
println('\n\n\nmalloc($n) total=$total_m')
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print_backtrace()
#endif
*/
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ptr := C.malloc(n)
if isnil(ptr) {
panic('malloc($n) failed')
}
return ptr
}
pub fn calloc(n int) byteptr {
if n < 0 {
panic('calloc(<0)')
}
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return C.calloc(n, 1)
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}
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[unsafe_fn]
pub fn free(ptr voidptr) {
C.free(ptr)
}
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pub fn memdup(src voidptr, sz int) voidptr {
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mem := malloc(sz)
return C.memcpy(mem, src, sz)
}
fn v_ptr_free(ptr voidptr) {
C.free(ptr)
}
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pub fn is_atty(fd int) int {
$if windows {
mut mode := 0
C.GetConsoleMode(C._get_osfhandle(fd), &mode)
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return mode
} $else {
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return C.isatty(fd)
}
}
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