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Optimize away one state in enums

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This commit is contained in:
Erick Tryzelaar
2014-05-24 14:11:25 -07:00
parent cb1b006b0f
commit ec32fc9a78
2 changed files with 12 additions and 29 deletions
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bench_enum.rs
+4 -14
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@@ -2,7 +2,7 @@ use test::Bencher;
use serialize::{Decoder, Decodable};
use de::{Deserializer, Deserializable, Token, End};
use de::{Deserializer, Deserializable, Token};
//////////////////////////////////////////////////////////////////////////////
@@ -194,12 +194,10 @@ mod deserializer {
use super::{Animal, Dog, Frog, Error, EndOfStream, SyntaxError};
use de::Deserializer;
use de::{Token, Int, StrBuf, EnumStart, EnumVariant, End};
use de::{Token, Int, StrBuf, EnumStart, End};
enum State {
AnimalState(Animal),
DogState,
FrogState,
IntState(int),
StrState(StrBuf),
EndState,
@@ -225,21 +223,13 @@ mod deserializer {
match self.stack.pop() {
Some(AnimalState(Dog)) => {
self.stack.push(EndState);
self.stack.push(DogState);
Some(Ok(EnumStart("Animal")))
Some(Ok(EnumStart("Animal", "Dog")))
}
Some(AnimalState(Frog(x0, x1))) => {
self.stack.push(EndState);
self.stack.push(IntState(x1));
self.stack.push(StrState(x0));
self.stack.push(FrogState);
Some(Ok(EnumStart("Animal")))
}
Some(DogState) => {
Some(Ok(EnumVariant("Dog")))
}
Some(FrogState) => {
Some(Ok(EnumVariant("Frog")))
Some(Ok(EnumStart("Animal", "Frog")))
}
Some(IntState(x)) => {
Some(Ok(Int(x)))