mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
339 lines
8.7 KiB
V
339 lines
8.7 KiB
V
module builtin
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type FnExitCb = fn ()
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fn C.atexit(f FnExitCb) int
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// exit terminates execution immediately and returns exit `code` to the shell.
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pub fn exit(code int) {
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C.exit(code)
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}
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// panic_debug private function that V uses for panics, -cg/-g is passed
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// recent versions of tcc print nicer backtraces automatically
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// NB: the duplication here is because tcc_backtrace should be called directly
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// inside the panic functions.
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fn panic_debug(line_no int, file string, mod string, fn_name string, s string) {
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// NB: the order here is important for a stabler test output
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// module is less likely to change than function, etc...
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// During edits, the line number will change most frequently,
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// so it is last
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eprintln('================ V panic ================')
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eprintln(' module: $mod')
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eprintln(' function: ${fn_name}()')
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eprintln(' message: $s')
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eprintln(' file: $file:$line_no')
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eprintln('=========================================')
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$if exit_after_panic_message ? {
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C.exit(1)
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} $else {
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$if no_backtrace ? {
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C.exit(1)
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} $else {
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$if tinyc {
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$if panics_break_into_debugger ? {
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break_if_debugger_attached()
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} $else {
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C.tcc_backtrace('Backtrace')
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}
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C.exit(1)
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}
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print_backtrace_skipping_top_frames(1)
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$if panics_break_into_debugger ? {
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break_if_debugger_attached()
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}
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C.exit(1)
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}
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}
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}
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// panic prints a nice error message, then exits the process with exit code of 1.
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// It also shows a backtrace on most platforms.
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pub fn panic(s string) {
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eprintln('V panic: $s')
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$if exit_after_panic_message ? {
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C.exit(1)
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} $else {
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$if no_backtrace ? {
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C.exit(1)
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} $else {
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$if tinyc {
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$if panics_break_into_debugger ? {
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break_if_debugger_attached()
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} $else {
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C.tcc_backtrace('Backtrace')
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}
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C.exit(1)
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}
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print_backtrace_skipping_top_frames(1)
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$if panics_break_into_debugger ? {
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break_if_debugger_attached()
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}
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C.exit(1)
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}
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}
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}
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// eprintln prints a message with a line end, to stderr. Both stderr and stdout are flushed.
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pub fn eprintln(s string) {
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C.fflush(C.stdout)
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C.fflush(C.stderr)
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// eprintln is used in panics, so it should not fail at all
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$if android {
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if s.str == 0 {
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C.fprintf(C.stderr, c'eprintln(NIL)\n')
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} else {
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C.fprintf(C.stderr, c'%.*s\n', s.len, s.str)
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}
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} $else {
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if s.str == 0 {
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C.write(2, c'eprintln(NIL)\n', 14)
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} else {
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C.write(2, s.str, s.len)
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C.write(2, c'\n', 1)
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}
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}
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C.fflush(C.stderr)
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}
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// eprint prints a message to stderr. Both stderr and stdout are flushed.
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pub fn eprint(s string) {
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C.fflush(C.stdout)
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C.fflush(C.stderr)
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$if android {
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if s.str == 0 {
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C.fprintf(C.stderr, c'eprint(NIL)')
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} else {
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C.fprintf(C.stderr, c'%.*s', s.len, s.str)
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}
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} $else {
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if s.str == 0 {
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C.write(2, c'eprint(NIL)', 11)
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} else {
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C.write(2, s.str, s.len)
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}
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}
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C.fflush(C.stderr)
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}
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// print prints a message to stdout. Unlike `println` stdout is not automatically flushed.
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// A call to `flush()` will flush the output buffer to stdout.
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pub fn print(s string) {
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$if android {
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C.fprintf(C.stdout, c'%.*s', s.len, s.str)
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} $else {
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C.write(1, s.str, s.len)
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}
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}
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/*
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#include "@VROOT/vlib/darwin/darwin.m"
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fn C.nsstring2(s string) voidptr
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fn C.NSLog(x voidptr)
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#include <asl.h>
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fn C.asl_log(voidptr, voidptr, int, charptr)
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*/
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// println prints a message with a line end, to stdout. stdout is flushed.
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pub fn println(s string) {
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$if windows {
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print(s)
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print('\n')
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} $else {
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// For debugging .app applications (no way to read stdout) so that it's printed to macOS Console
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/*
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$if macos {
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C.asl_log(0, 0, C.ASL_LEVEL_ERR, s.str)
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}
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*/
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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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// $if !android {
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// snl := s + '\n'
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// C.syscall(/* sys_write */ 1, /* stdout_value */ 1, snl.str, s.len+1)
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// return
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// }
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// }
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C.printf('%.*s\n', s.len, s.str)
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}
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}
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// malloc dynamically allocates a `n` bytes block of memory on the heap.
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// malloc returns a `byteptr` pointing to the memory address of the allocated space.
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// unlike the `calloc` family of functions - malloc will not zero the memory block.
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[unsafe]
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pub fn malloc(n int) byteptr {
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if n <= 0 {
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panic('> V malloc(<=0)')
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}
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$if vplayground ? {
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if n > 10000 {
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panic('allocating more than 10 KB is not allowed in the playground')
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}
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}
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$if trace_malloc ? {
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total_m += n
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C.fprintf(C.stderr, c'v_malloc %d total %d\n', n, total_m)
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// print_backtrace()
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}
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mut res := byteptr(0)
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$if prealloc {
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res = g_m2_ptr
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unsafe {
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g_m2_ptr += n
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}
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nr_mallocs++
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} $else {
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res = unsafe { C.malloc(n) }
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if res == 0 {
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panic('malloc($n) failed')
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}
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}
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$if debug_malloc ? {
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// Fill in the memory with something != 0, so it is easier to spot
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// when the calling code wrongly relies on it being zeroed.
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unsafe { C.memset(res, 0x88, n) }
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}
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return res
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}
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/*
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#include <malloc/malloc.h>
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fn malloc_size(b byteptr) int
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*/
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// v_realloc resizes the memory block `b` with `n` bytes.
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// The `b byteptr` must be a pointer to an existing memory block
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// previously allocated with `malloc`, `v_calloc` or `vcalloc`.
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// Please, see also realloc_data, and use it instead if possible.
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[unsafe]
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pub fn v_realloc(b byteptr, n int) byteptr {
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mut new_ptr := byteptr(0)
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$if prealloc {
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unsafe {
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new_ptr = malloc(n)
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C.memcpy(new_ptr, b, n)
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}
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} $else {
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new_ptr = unsafe { C.realloc(b, n) }
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if new_ptr == 0 {
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panic('realloc($n) failed')
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}
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}
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return new_ptr
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}
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// realloc_data resizes the memory block pointed by `old_data` to `new_size`
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// bytes. `old_data` must be a pointer to an existing memory block, previously
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// allocated with `malloc`, `v_calloc` or `vcalloc`, of size `old_data`.
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// realloc_data returns a pointer to the new location of the block.
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// NB: if you know the old data size, it is preferable to call `realloc_data`,
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// instead of `v_realloc`, at least during development, because `realloc_data`
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// can make debugging easier, when you compile your program with
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// `-d debug_realloc`.
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[unsafe]
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pub fn realloc_data(old_data byteptr, old_size int, new_size int) byteptr {
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$if prealloc {
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unsafe {
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new_ptr := malloc(new_size)
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min_size := if old_size < new_size { old_size } else { new_size }
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C.memcpy(new_ptr, old_data, min_size)
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return new_ptr
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}
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}
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$if debug_realloc ? {
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// NB: this is slower, but helps debugging memory problems.
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// The main idea is to always force reallocating:
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// 1) allocate a new memory block
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// 2) copy the old to the new
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// 3) fill the old with 0x57 (`W`)
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// 4) free the old block
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// => if there is still a pointer to the old block somewhere
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// it will point to memory that is now filled with 0x57.
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unsafe {
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new_ptr := malloc(new_size)
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min_size := if old_size < new_size { old_size } else { new_size }
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C.memcpy(new_ptr, old_data, min_size)
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C.memset(old_data, 0x57, old_size)
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C.free(old_data)
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return new_ptr
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}
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}
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nptr := unsafe { C.realloc(old_data, new_size) }
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if nptr == 0 {
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panic('realloc_data($old_data, $old_size, $new_size) failed')
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}
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return nptr
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}
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// v_calloc dynamically allocates a zeroed `n` bytes block of memory on the heap.
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// v_calloc returns a `byteptr` pointing to the memory address of the allocated space.
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pub fn v_calloc(n int) byteptr {
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return C.calloc(1, n)
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}
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// vcalloc dynamically allocates a zeroed `n` bytes block of memory on the heap.
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// vcalloc returns a `byteptr` pointing to the memory address of the allocated space.
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// Unlike `v_calloc` vcalloc checks for negative values given in `n`.
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pub fn vcalloc(n int) byteptr {
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if n < 0 {
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panic('calloc(<=0)')
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} else if n == 0 {
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return byteptr(0)
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}
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return C.calloc(1, n)
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}
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// free allows for manually freeing memory allocated at the address `ptr`.
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[unsafe]
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pub fn free(ptr voidptr) {
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$if prealloc {
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return
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}
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C.free(ptr)
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}
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// memdup dynamically allocates a `sz` bytes block of memory on the heap
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// memdup then copies the contents of `src` into the allocated space and
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// returns a pointer to the newly allocated space.
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[unsafe]
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pub fn memdup(src voidptr, sz int) voidptr {
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if sz == 0 {
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return vcalloc(1)
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}
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unsafe {
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mem := malloc(sz)
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return C.memcpy(mem, src, sz)
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}
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}
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// v_ptr_free is used internally to manually free up memory allocated at the address `ptr`.
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fn v_ptr_free(ptr voidptr) {
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$if prealloc {
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return
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}
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C.free(ptr)
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}
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// is_atty returns 1 if the `fd` file descriptor is open and refers to a terminal
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pub fn is_atty(fd int) int {
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$if windows {
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mut mode := u32(0)
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osfh := voidptr(C._get_osfhandle(fd))
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C.GetConsoleMode(osfh, voidptr(&mode))
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return int(mode)
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} $else {
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return C.isatty(fd)
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}
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}
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[inline]
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fn v_fixed_index(i int, len int) int {
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$if !no_bounds_checking ? {
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if i < 0 || i >= len {
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s := 'fixed array index out of range (index: $i, len: $len)'
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panic(s)
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}
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}
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return i
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}
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