v/vlib/builtin/builtin.c.v

277 lines
6.9 KiB
V

module builtin
type FnExitCb = fn ()
fn C.atexit(f FnExitCb) int
// exit terminates execution immediately and returns exit `code` to the shell.
pub fn exit(code int) {
C.exit(code)
}
// panic_debug private function that V uses for panics, -cg/-g is passed
// recent versions of tcc print nicer backtraces automatically
// NB: the duplication here is because tcc_backtrace should be called directly
// inside the panic functions.
fn panic_debug(line_no int, file string, mod string, fn_name string, s string) {
// NB: the order here is important for a stabler test output
// module is less likely to change than function, etc...
// During edits, the line number will change most frequently,
// so it is last
eprintln('================ V panic ================')
eprintln(' module: $mod')
eprintln(' function: ${fn_name}()')
eprintln(' message: $s')
eprintln(' file: $file')
eprintln(' line: ' + line_no.str())
eprintln('=========================================')
$if exit_after_panic_message ? {
C.exit(1)
} $else {
$if no_backtrace ? {
C.exit(1)
} $else {
$if tinyc {
$if panics_break_into_debugger ? {
break_if_debugger_attached()
} $else {
C.tcc_backtrace('Backtrace')
}
C.exit(1)
}
print_backtrace_skipping_top_frames(1)
$if panics_break_into_debugger ? {
break_if_debugger_attached()
}
C.exit(1)
}
}
}
// panic prints a nice error message, then exits the process with exit code of 1.
// It also shows a backtrace on most platforms.
pub fn panic(s string) {
eprintln('V panic: $s')
$if exit_after_panic_message ? {
C.exit(1)
} $else {
$if no_backtrace ? {
C.exit(1)
} $else {
$if tinyc {
$if panics_break_into_debugger ? {
break_if_debugger_attached()
} $else {
C.tcc_backtrace('Backtrace')
}
C.exit(1)
}
print_backtrace_skipping_top_frames(1)
$if panics_break_into_debugger ? {
break_if_debugger_attached()
}
C.exit(1)
}
}
}
// eprintln prints a message with a line end, to stderr. Both stderr and stdout are flushed.
pub fn eprintln(s string) {
C.fflush(C.stdout)
C.fflush(C.stderr)
// eprintln is used in panics, so it should not fail at all
if s.str == 0 {
C.write(2, c'eprintln(NIL)\n', 14)
} else {
C.write(2, s.str, s.len)
C.write(2, c'\n', 1)
}
C.fflush(C.stderr)
}
// eprint prints a message to stderr. Both stderr and stdout are flushed.
pub fn eprint(s string) {
C.fflush(C.stdout)
C.fflush(C.stderr)
if s.str == 0 {
C.write(2, c'eprint(NIL)\n', 12)
} else {
C.write(2, s.str, s.len)
}
C.fflush(C.stderr)
}
// print prints a message to stdout. Unlike `println` stdout is not automatically flushed.
// A call to `flush()` will flush the output buffer to stdout.
pub fn print(s string) {
C.write(1, s.str, s.len)
}
/*
#include "@VROOT/vlib/darwin/darwin.m"
fn C.nsstring2(s string) voidptr
fn C.NSLog(x voidptr)
#include <asl.h>
fn C.asl_log(voidptr, voidptr, int, charptr)
*/
// println prints a message with a line end, to stdout. stdout is flushed.
pub fn println(s string) {
$if windows {
print(s)
print('\n')
} $else {
// For debugging .app applications (no way to read stdout) so that it's printed to macOS Console
/*
$if macos {
C.asl_log(0, 0, C.ASL_LEVEL_ERR, s.str)
}
*/
// TODO: a syscall sys_write on linux works, except for the v repl.
// Probably it is a stdio buffering issue. Needs more testing...
// $if linux {
// $if !android {
// snl := s + '\n'
// C.syscall(/* sys_write */ 1, /* stdout_value */ 1, snl.str, s.len+1)
// return
// }
// }
C.printf('%.*s\n', s.len, s.str)
}
}
// malloc dynamically allocates a `n` bytes block of memory on the heap.
// malloc returns a `byteptr` pointing to the memory address of the allocated space.
// unlike the `calloc` family of functions - malloc will not zero the memory block.
[unsafe]
pub fn malloc(n int) byteptr {
if n <= 0 {
panic('> V malloc(<=0)')
}
$if vplayground ? {
if n > 10000 {
panic('allocating more than 10 KB is not allowed in the playground')
}
}
$if trace_malloc ? {
total_m += n
C.fprintf(C.stderr, c'v_malloc %d total %d\n', n, total_m)
// print_backtrace()
}
mut res := byteptr(0)
$if prealloc {
res = g_m2_ptr
unsafe {
g_m2_ptr += n
}
nr_mallocs++
} $else {
res = unsafe { C.malloc(n) }
if res == 0 {
panic('malloc($n) failed')
}
}
return res
}
/*
#include <malloc/malloc.h>
fn malloc_size(b byteptr) int
*/
// v_realloc resizes the memory block `b` with `n` bytes.
// The `b byteptr` must be a pointer to an existing memory block
// previously allocated with `malloc`, `v_calloc` or `vcalloc`.
[unsafe]
pub fn v_realloc(b byteptr, n int) byteptr {
mut new_ptr := byteptr(0)
$if prealloc {
unsafe {
new_ptr = malloc(n)
C.memcpy(new_ptr, b, n)
}
} $else {
$if debug_realloc ? {
// NB: this is slower, but helps debugging memory problems.
// The main idea is to always force reallocating:
// 1) allocate a new memory block
// 2) copy the old to the new
// 3) fill the old with 0x57 (`W`)
// 4) free the old block
// => if there is still a pointer to the old block somewhere
// it will point to memory that is now filled with 0x57.
unsafe {
new_ptr = malloc(n)
C.memcpy(new_ptr, b, n)
C.memset(b, 0x57, n)
C.free(b)
}
} $else {
new_ptr = unsafe { C.realloc(b, n) }
if new_ptr == 0 {
panic('realloc($n) failed')
}
}
}
return new_ptr
}
// v_calloc dynamically allocates a zeroed `n` bytes block of memory on the heap.
// v_calloc returns a `byteptr` pointing to the memory address of the allocated space.
pub fn v_calloc(n int) byteptr {
return C.calloc(1, n)
}
// vcalloc dynamically allocates a zeroed `n` bytes block of memory on the heap.
// vcalloc returns a `byteptr` pointing to the memory address of the allocated space.
// Unlike `v_calloc` vcalloc checks for negative values given in `n`.
pub fn vcalloc(n int) byteptr {
if n < 0 {
panic('calloc(<=0)')
} else if n == 0 {
return byteptr(0)
}
return C.calloc(1, n)
}
// free allows for manually freeing memory allocated at the address `ptr`.
[unsafe]
pub fn free(ptr voidptr) {
$if prealloc {
return
}
C.free(ptr)
}
// memdup dynamically allocates a `sz` bytes block of memory on the heap
// memdup then copies the contents of `src` into the allocated space and
// returns a pointer to the newly allocated space.
[unsafe]
pub fn memdup(src voidptr, sz int) voidptr {
if sz == 0 {
return vcalloc(1)
}
unsafe {
mem := malloc(sz)
return C.memcpy(mem, src, sz)
}
}
// v_ptr_free is used internally to manually free up memory allocated at the address `ptr`.
fn v_ptr_free(ptr voidptr) {
$if prealloc {
return
}
C.free(ptr)
}
// is_atty returns 1 if the `fd` file descriptor is open and refers to a terminal
pub fn is_atty(fd int) int {
$if windows {
mut mode := u32(0)
osfh := voidptr(C._get_osfhandle(fd))
C.GetConsoleMode(osfh, voidptr(&mode))
return int(mode)
} $else {
return C.isatty(fd)
}
}