bjoernager/rust
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Use cranelift_frontend::Switch for switchInt

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This commit is contained in:
bjorn3 2018-09-25 18:02:37 +02:00
parent c37e5ff96d
commit b11cb572dc
4 changed files with 71 additions and 39 deletions
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21
src/base.rs
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@ -202,21 +202,14 @@ fn codegen_fn_content<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx, impl Backend>)
values,
targets,
} => {
// TODO: prevent panics on large and negative disciminants
if should_codegen(fx.tcx.sess) {
let discr = trans_operand(fx, discr).load_value(fx);
let mut jt_data = JumpTableData::new();
for (i, value) in values.iter().enumerate() {
let ebb = fx.get_ebb(targets[i]);
jt_data.set_entry(*value as usize, ebb);
}
let jump_table = fx.bcx.create_jump_table(jt_data);
fx.bcx.ins().br_table(discr, jump_table);
let otherwise_ebb = fx.get_ebb(targets[targets.len() - 1]);
fx.bcx.ins().jump(otherwise_ebb, &[]);
} else {
fx.bcx.ins().trap(TrapCode::User(0));
let discr = trans_operand(fx, discr).load_value(fx);
let mut switch = ::cranelift::frontend::Switch::new();
for (i, value) in values.iter().enumerate() {
let ebb = fx.get_ebb(targets[i]);
switch.set_entry(*value as u64, ebb);
}
let otherwise_ebb = fx.get_ebb(targets[targets.len() - 1]);
switch.emit(&mut fx.bcx, discr, otherwise_ebb);
}
TerminatorKind::Call {
func,