72 lines
1.5 KiB
Zig
72 lines
1.5 KiB
Zig
pub const SYS_write = 1;
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pub const SYS_exit = 60;
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pub const stdout_fileno = 1;
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// normal comment
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/// this is a documentation comment
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/// doc comment line 2
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fn emptyFunctionWithComments() {
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}
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export fn disabledExternFn() {
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@setFnVisible(this, false);
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}
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fn inlinedLoop() {
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inline var i = 0;
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inline var sum = 0;
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inline while (i <= 5; i += 1)
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sum += i;
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assert(sum == 15);
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}
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fn assert(ok: bool) {
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if (!ok)
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@unreachable();
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}
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fn runAllTests() {
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emptyFunctionWithComments();
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disabledExternFn();
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inlinedLoop();
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}
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export nakedcc fn _start() -> unreachable {
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myMain();
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}
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fn myMain() -> unreachable {
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runAllTests();
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const text = "OK\n";
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write(stdout_fileno, &text[0], text.len);
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exit(0);
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}
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pub inline fn syscall1(number: usize, arg1: usize) -> usize {
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asm volatile ("syscall"
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: [ret] "={rax}" (-> usize)
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: [number] "{rax}" (number),
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[arg1] "{rdi}" (arg1)
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: "rcx", "r11")
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}
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pub inline fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) -> usize {
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asm volatile ("syscall"
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: [ret] "={rax}" (-> usize)
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: [number] "{rax}" (number),
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[arg1] "{rdi}" (arg1),
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[arg2] "{rsi}" (arg2),
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[arg3] "{rdx}" (arg3)
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: "rcx", "r11")
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}
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pub fn write(fd: i32, buf: &const u8, count: usize) -> usize {
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syscall3(SYS_write, usize(fd), usize(buf), count)
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}
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pub fn exit(status: i32) -> unreachable {
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syscall1(SYS_exit, usize(status));
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@unreachable()
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}
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