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clean up codegen.rs

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This commit is contained in:
Mark Thom
2018-01-31 19:49:48 -07:00
parent b761575f7f
commit d1c281ac0a
1 changed files with 7 additions and 12 deletions
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11
src/prolog/codegen.rs
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@@ -8,7 +8,6 @@ use prolog::targets::*;
use std::cell::Cell;
use std::collections::HashMap;
use std::mem::swap;
use std::vec::Vec;
pub struct CodeGenerator<'a, TermMarker> {
@@ -286,11 +285,8 @@ impl<'a, TermMarker: Allocator<'a>> CodeGenerator<'a, TermMarker>
let mut dealloc_index = code.len() - 1;
match code.last_mut() {
Some(&mut Line::Control(ref mut ctrl)) => {
let mut instr = ControlInstruction::Proceed;
swap(ctrl, &mut instr);
match instr {
Some(&mut Line::Control(ref mut ctrl)) =>
match ctrl.clone() {
ControlInstruction::ArgCall =>
*ctrl = ControlInstruction::ArgExecute,
ControlInstruction::Call(name, arity, _) =>
@@ -313,8 +309,7 @@ impl<'a, TermMarker: Allocator<'a>> CodeGenerator<'a, TermMarker>
*ctrl = ControlInstruction::IsExecute(r, at),
ControlInstruction::Proceed => {},
_ => dealloc_index += 1 // = code.len()
}
},
},
Some(&mut Line::Cut(CutInstruction::Cut)) =>
dealloc_index += 1,
_ => {}