60 lines
1.8 KiB
Rust
60 lines
1.8 KiB
Rust
use prolog::ast::*;
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use prolog::fixtures::*;
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use prolog::targets::*;
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use std::cell::Cell;
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pub trait Allocator<'a>
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{
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fn new() -> Self;
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fn mark_anon_var<Target>(&mut self, Level, &mut Vec<Target>)
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where Target: CompilationTarget<'a>;
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fn mark_non_var<Target>(&mut self, Level, GenContext, &'a Cell<RegType>, &mut Vec<Target>)
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where Target: CompilationTarget<'a>;
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fn mark_var<Target>(&mut self, &'a Var, Level, &'a Cell<VarReg>, GenContext, &mut Vec<Target>)
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where Target: CompilationTarget<'a>;
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fn reset(&mut self);
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fn reset_contents(&mut self) {}
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fn reset_arg(&mut self, usize);
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fn reset_arg_at_head(&mut self, &Term);
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fn advance_arg(&mut self);
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fn bindings(&self) -> &AllocVarDict<'a>;
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fn bindings_mut(&mut self) -> &mut AllocVarDict<'a>;
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fn take_bindings(self) -> AllocVarDict<'a>;
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fn drain_var_data(&mut self, vs: VariableFixtures<'a>) -> VariableFixtures<'a>
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{
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let mut perm_vs = VariableFixtures::new();
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for (var, (var_status, cells)) in vs.into_iter() {
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match var_status {
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VarStatus::Temp(chunk_num, tvd) => {
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self.bindings_mut().insert(var, VarData::Temp(chunk_num, 0, tvd));
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},
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VarStatus::Perm(_) => {
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self.bindings_mut().insert(var, VarData::Perm(0));
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perm_vs.insert(var, (var_status, cells));
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}
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};
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}
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perm_vs
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}
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fn get(&self, var: &'a Var) -> RegType {
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self.bindings().get(var).unwrap().as_reg_type()
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}
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fn record_register(&mut self, var: &'a Var, r: RegType) {
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match self.bindings_mut().get_mut(var).unwrap() {
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&mut VarData::Temp(_, ref mut s, _) => *s = r.reg_num(),
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&mut VarData::Perm(ref mut s) => *s = r.reg_num()
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}
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}
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}
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