oxiz-core

Core data structures and utilities for OxiZ SMT solver.

Status (v0.2.1)

Overview

This crate provides the foundational components used across all OxiZ crates:

• AST - Term representation with hash-consing for memory efficiency
• Sorts - Type system for SMT sorts (Bool, Int, Real, BitVec, etc.)
• SMT-LIB2 - Lexer, parser, and printer for the standard SMT format
• Tactics - Framework for solver strategies and term transformations

Modules

ast

Hash-consed term representation using arena allocation:

use oxiz_core::ast::TermManager;

let mut tm = TermManager::new();
let x = tm.mk_var("x", sort_bool);
let y = tm.mk_var("y", sort_bool);
let and_xy = tm.mk_and([x, y]);

Key types:

• TermId - Lightweight handle to a term
• Term - Term data (kind, sort, children)
• TermKind - Enum of all term kinds (And, Or, Not, Eq, etc.)
• TermManager - Creates and interns terms

sort

Sort (type) system:

use oxiz_core::sort::SortManager;

let mut sm = SortManager::new();
let bool_sort = sm.bool();
let int_sort = sm.int();
let bv32 = sm.bitvec(32);
let array_sort = sm.array(int_sort, bool_sort);

smtlib

SMT-LIB2 parsing and printing:

use oxiz_core::smtlib::{Lexer, Parser};

let input = "(declare-const x Int) (assert (> x 0)) (check-sat)";
let mut parser = Parser::new(input, &mut term_manager, &mut sort_manager);
let commands = parser.parse_script()?;

tactic

Tactic framework for solver strategies:

use oxiz_core::tactic::{Goal, SimplifyTactic, Tactic};

let mut tactic = SimplifyTactic::new();
let result = tactic.apply(goal)?;

Dependencies

• rustc-hash - Fast hash maps
• smallvec - Stack-allocated vectors
• thiserror - Error handling

License

Apache-2.0