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v/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
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() {
return
$if mac {
buffer := [100]voidptr
nr_ptrs := C.backtrace(buffer, 100)
C.backtrace_symbols_fd(buffer, nr_ptrs, 1)
}
}
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)')
}
C.printf('%.*s\n', s.len, s.str)
}
pub fn eprintln(s string) {
if isnil(s.str) {
panic('eprintln(NIL)')
}
$if mac {
C.fprintf(stderr, '%.*s\n', s.len, s.str)
}
// TODO issues with stderr and cross compiling for Linux
$else {
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println(s)
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}
}
pub fn print(s string) {
C.printf('%.*s', s.len, s.str)
}
pub fn malloc(n int) byteptr {
if n < 0 {
panic('malloc(<0)')
}
#ifdef VPLAY
if n > 10000 {
panic('allocating more than 10 KB is not allowed in the playground')
}
#endif
#ifdef DEBUG_ALLOC
total := i64(0)
# total_m += n;
# total = total_m;
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println('\n\n\nmalloc($n) total=$total')
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print_backtrace()
#endif
ptr := C.malloc(n)
if isnil(ptr) {
panic('malloc($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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}
fn _strlen(s byteptr) int {
// TODO don't call a C function, implement it in V
return C.strlen(s)
}
// `fn foo() ?Foo { return foo }` => `fn foo() ?Foo { return opt_ok(foo); }`
fn opt_ok(data voidptr) Option {
return Option {
data: data
ok: true
}
}
fn memdup(src voidptr, sz int) voidptr {
mem := malloc(sz)
return C.memcpy(mem, src, sz)
}
pub fn error(s string) Option {
return Option {
error: s
}
}
// TODO this is not used anymore
fn range_int(start, end int) []int {
len := end - start
mut res := [0; len]
for i := 0; i < len; i++ {
res[i] = start + i
}
return res
}