107 lines
2.8 KiB
Rust
107 lines
2.8 KiB
Rust
use crate::parser::ast::*;
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use crate::temp_v;
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use crate::fixtures::*;
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use crate::forms::*;
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use crate::instructions::*;
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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(crate) trait Allocator {
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fn new() -> Self;
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fn mark_anon_var<'a, Target: CompilationTarget<'a>>(
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&mut self,
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lvl: Level,
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context: GenContext,
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code: &mut Code,
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);
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fn mark_non_var<'a, Target: CompilationTarget<'a>>(
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&mut self,
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lvl: Level,
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context: GenContext,
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cell: &'a Cell<RegType>,
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code: &mut Code,
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);
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fn mark_reserved_var<'a, Target: CompilationTarget<'a>>(
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&mut self,
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var_name: Rc<String>,
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lvl: Level,
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cell: &'a Cell<VarReg>,
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term_loc: GenContext,
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code: &mut Code,
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r: RegType,
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is_new_var: bool,
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);
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fn mark_var<'a, Target: CompilationTarget<'a>>(
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&mut self,
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var_name: Rc<String>,
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lvl: Level,
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cell: &'a Cell<VarReg>,
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context: GenContext,
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code: &mut Code,
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);
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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, arg_num: usize);
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fn reset_at_head(&mut self, args: &Vec<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<'a>(
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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<String>) -> 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<String>) -> 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<String>, 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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