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Add an EntityMap::get_or_default() method.

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This covers a common pattern for secondary entity maps: Get the value in
the map or the default value for out-of-range keys.
This commit is contained in:
Jakob Stoklund Olesen
2017-04-25 15:50:59 -07:00
parent 440add86e7
commit d078c546e5
5 changed files with 10 additions and 18 deletions
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7
cranelift/src/filetest/binemit.rs
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@@ -106,10 +106,7 @@ impl SubTest for TestBinEmit {
// Give an encoding to any instruction that doesn't already have one.
for ebb in func.layout.ebbs() {
for inst in func.layout.ebb_insts(ebb) {
if !func.encodings
.get(inst)
.map(|e| e.is_legal())
.unwrap_or(false) {
if !func.encodings.get_or_default(inst).is_legal() {
if let Ok(enc) = isa.encode(&func.dfg,
&func.dfg[inst],
func.dfg.ctrl_typevar(inst)) {
@@ -157,7 +154,7 @@ impl SubTest for TestBinEmit {
ebb);
for inst in func.layout.ebb_insts(ebb) {
sink.text.clear();
let enc = func.encodings.get(inst).cloned().unwrap_or_default();
let enc = func.encodings.get_or_default(inst);
// Send legal encodings into the emitter.
if enc.is_legal() {