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support more than 6 function args, x11 example

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This commit is contained in:
Antoni Piasecki
2025-11-13 21:22:27 +01:00
parent 852c463532
commit 552a404d73
3 changed files with 67 additions and 7 deletions
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34
src/codegen_x86_64.rs
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@@ -466,12 +466,28 @@ _builtin_set64:
emit!(&mut self.output, " push rax");
}
for i in (0..args.len()).rev() {
let reg = match REGISTERS.get(i) {
Some(x) => x,
None => return error!(&paren.loc, "only up to 6 args allowed"),
};
emit!(&mut self.output, " pop {}", reg);
let arg_count = args.len();
if arg_count <= 6 {
for i in (0..arg_count).rev() {
emit!(&mut self.output, " pop {}", REGISTERS[i]);
}
} else {
for (i, reg) in REGISTERS.iter().enumerate() {
let offset = 8 * (arg_count - 1 - i);
emit!(
&mut self.output,
" mov {}, QWORD [rsp + {}]",
reg,
offset
);
}
let num_stack = arg_count - 6;
for i in 0..num_stack {
let arg_idx = arg_count - 1 - i;
let offset = 8 * (arg_count - 1 - arg_idx);
emit!(&mut self.output, " mov rax, QWORD [rsp + {}]", offset);
emit!(&mut self.output, " push rax");
}
}
match env.get_var(&callee) {
@@ -487,6 +503,12 @@ _builtin_set64:
emit!(&mut self.output, " call {}", callee);
}
};
if arg_count > 6 {
let num_stack = arg_count - 6;
emit!(&mut self.output, " add rsp, {}", 8 * num_stack);
emit!(&mut self.output, " add rsp, {}", 8 * arg_count);
}
}
Expr::ArrayLiteral(exprs) => {
emit!(&mut self.output, " call array.new");