91 lines
2.6 KiB
Rust
91 lines
2.6 KiB
Rust
use crate::prolog_parser::ast::*;
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use crate::fixtures::*;
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use crate::forms::*;
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use crate::machine::machine_indices::*;
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use crate::targets::*;
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use std::cell::Cell;
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use std::rc::Rc;
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pub trait Allocator<'a> {
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fn new() -> Self;
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fn mark_anon_var<Target>(&mut self, _: Level, _: GenContext, _: &mut Vec<Target>)
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where
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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
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Target: CompilationTarget<'a>;
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fn mark_reserved_var<Target>(
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&mut self,
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_: Rc<Var>,
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_: Level,
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_: &'a Cell<VarReg>,
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_: GenContext,
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_: &mut Vec<Target>,
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_: RegType,
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_: bool,
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) where
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Target: CompilationTarget<'a>;
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fn mark_var<Target>(&mut self, _: Rc<Var>, _: Level, _: &'a Cell<VarReg>, _: GenContext, _: &mut Vec<Target>)
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where
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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_at_head(&mut self, _: &Vec<Box<Term>>);
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fn advance_arg(&mut self);
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fn bindings(&self) -> &AllocVarDict;
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fn bindings_mut(&mut self) -> &mut AllocVarDict;
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fn take_bindings(self) -> AllocVarDict;
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fn drain_var_data(
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&mut self,
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vs: VariableFixtures<'a>,
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num_of_chunks: usize
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) -> VariableFixtures<'a> {
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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()
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.insert(var.clone(), VarData::Temp(chunk_num, 0, tvd));
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if chunk_num + 1 == num_of_chunks {
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perm_vs.insert_last_chunk_temp_var(var);
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}
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}
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VarStatus::Perm(_) => {
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self.bindings_mut().insert(var.clone(), 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: Rc<Var>) -> RegType {
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self.bindings()
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.get(&var)
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.map_or(temp_v!(0), |v| v.as_reg_type())
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}
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fn is_unbound(&self, var: Rc<Var>) -> bool {
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self.get(var).reg_num() == 0
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}
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fn record_register(&mut self, var: Rc<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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