爱特每羊队
46 lines
1.5 KiB
Rust
46 lines
1.5 KiB
Rust
use super::*;
|
|
|
|
impl Compiler {
|
|
fn count_switch_statement(&self, stmt: &oxide_parser::SwitchStatement<'_>, ctx: &mut CompileCtx) {
|
|
let id = ctx.next_label_id();
|
|
let end_label = Label::SwitchEnd(id);
|
|
ctx.push_switch(end_label);
|
|
|
|
self.count_expression(&stmt.discriminant, ctx);
|
|
let compare_reg_checkpoint = ctx.reg_checkpoint();
|
|
|
|
let cases = &stmt.cases;
|
|
for case in cases.iter() {
|
|
if let Some(test) = &case.test {
|
|
self.count_expression(test, ctx);
|
|
ctx.projected_pc += 1; // EQ
|
|
ctx.alloc_reg(); // eq result
|
|
ctx.projected_pc += 1; // JMP_IF_TRUE
|
|
ctx.restore_reg_checkpoint(compare_reg_checkpoint);
|
|
}
|
|
}
|
|
|
|
let has_default = cases.iter().any(|c| c.test.is_none());
|
|
if !has_default {
|
|
ctx.projected_pc += 1; // JMP to SwitchEnd (no match)
|
|
}
|
|
|
|
for (case_idx, case) in cases.iter().enumerate() {
|
|
let case_label = Label::SwitchCase(id, case_idx as u32);
|
|
ctx.labels.label_map.insert(case_label, ctx.projected_pc);
|
|
for s in &case.consequent {
|
|
self.count_statement(s, ctx);
|
|
}
|
|
}
|
|
|
|
ctx.labels.label_map.insert(end_label, ctx.projected_pc);
|
|
ctx.pop_switch();
|
|
}
|
|
|
|
pub(in crate::counter) fn count_switch_domain(&self, stmt: &Statement, ctx: &mut CompileCtx) {
|
|
if let Statement::SwitchStatement(sw) = stmt {
|
|
self.count_switch_statement(sw, ctx);
|
|
}
|
|
}
|
|
}
|