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interpreter: while & do-while loops

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This commit is contained in:
Guillem L. Jara
2026-05-24 01:56:16 +02:00
parent c039db632b
commit 135fbaeb0a
1 changed files with 32 additions and 1 deletions
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interpreter/src/ir/lower.rs
+32 -1
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@@ -55,15 +55,46 @@ impl Code<'_> {
.emit(Instruction::branch(condition.reg(), label_then, Label(0)));
self.free_reg(condition);
self.lower_body(then_body);
self.bc.nth(if_label).args.branch.2 = self.following_instr(1);
self.bc.nth(if_label).args.branch.2 = self.following_instr(0);
if let Some(else_body) = else_body {
state.reg_pointer += 1;
unsafe { self.bc.nth(if_label).args.branch.2.0 += 1 };
let end_label = self.bc.emit(Instruction::jump(Label(0)));
state.scope_hwm(self, |c| c.lower_body(else_body));
self.bc.nth(end_label).args.jump = self.following_instr(0);
}
}
Statement::While {
condition,
then_body,
} => {
let cond_label = self.following_instr(0);
let condition = self.lower_expr(condition);
let while_label = self.bc.emit(Instruction::branch(
condition.reg(),
self.following_instr(1),
Label(0),
));
self.free_reg(condition);
self.lower_body(then_body);
self.bc.emit(Instruction::jump(cond_label));
self.bc.nth(while_label).args.branch.2 = self.following_instr(0);
}
Statement::DoWhile {
then_body,
condition,
} => {
let do_label = self.following_instr(0);
self.lower_body(then_body);
let condition = self.lower_expr(condition);
self.bc.emit(Instruction::branch(
condition.reg(),
do_label,
self.following_instr(1),
));
self.free_reg(condition);
}
Statement::Simple(SimpleStatement::Expression(expr)) => {
let reg = self.lower_expr(expr);
self.free_reg(reg);