aver/interpreter/
exec.rs

1use super::*;
2
3impl Interpreter {
4    pub fn exec_items(&mut self, items: &[TopLevel]) -> Result<Value, RuntimeError> {
5        for item in items {
6            match item {
7                TopLevel::FnDef(fd) => self.exec_fn_def(fd)?,
8                TopLevel::Module(_) => {}
9                TopLevel::Verify(_) => {}
10                TopLevel::Decision(_) => {}
11                TopLevel::TypeDef(td) => self.register_type_def(td),
12                TopLevel::Stmt(s) => {
13                    self.exec_stmt(s)?;
14                }
15            }
16        }
17        Ok(Value::Unit)
18    }
19
20    /// Register a user-defined type: sum type variants and record constructors.
21    pub fn register_type_def(&mut self, td: &TypeDef) {
22        match td {
23            TypeDef::Sum {
24                name: type_name,
25                variants,
26                ..
27            } => {
28                let mut members = HashMap::new();
29                for variant in variants {
30                    if variant.fields.is_empty() {
31                        // Zero-arg variant: stored directly as a Value
32                        members.insert(
33                            variant.name.clone(),
34                            Value::Variant {
35                                type_name: type_name.clone(),
36                                variant: variant.name.clone(),
37                                fields: vec![].into(),
38                            },
39                        );
40                    } else {
41                        // Constructor function
42                        members.insert(
43                            variant.name.clone(),
44                            Value::Builtin(format!("__ctor:{}:{}", type_name, variant.name)),
45                        );
46                    }
47                }
48                self.define(
49                    type_name.clone(),
50                    Value::Namespace {
51                        name: type_name.clone(),
52                        members,
53                    },
54                );
55            }
56            TypeDef::Product { name, fields, .. } => {
57                // Product types are constructed via Expr::RecordCreate.
58                // Keep declaration field order so runtime records are canonicalized
59                // and positional record matches stay stable.
60                let schema = fields.iter().map(|(field, _)| field.clone()).collect();
61                self.record_schemas.insert(name.clone(), schema);
62            }
63        }
64    }
65
66    pub fn exec_fn_def(&mut self, fd: &FnDef) -> Result<(), RuntimeError> {
67        let val = Value::Fn(Rc::new(crate::value::FunctionValue {
68            name: Rc::new(fd.name.clone()),
69            params: Rc::new(fd.params.clone()),
70            return_type: Rc::new(fd.return_type.clone()),
71            effects: Rc::new(fd.effects.clone()),
72            body: Rc::clone(&fd.body),
73            lowered_body: super::lowered::lower_fn_body(fd.body.as_ref()),
74            resolution: fd.resolution.clone(),
75            memo_eligible: self.memo_fns.contains(&fd.name),
76            home_globals: None,
77        }));
78        self.define(fd.name.clone(), val);
79        Ok(())
80    }
81
82    pub fn exec_stmt(&mut self, stmt: &Stmt) -> Result<Value, RuntimeError> {
83        match stmt {
84            Stmt::Binding(name, _, expr) => {
85                let val = self.eval_expr(expr)?;
86                self.define(name.clone(), val);
87                Ok(Value::Unit)
88            }
89            Stmt::Expr(expr) => self.eval_expr(expr),
90        }
91    }
92
93    pub fn exec_body(&mut self, stmts: &[Stmt]) -> Result<Value, RuntimeError> {
94        let mut last = Value::Unit;
95        for stmt in stmts {
96            last = self.exec_stmt(stmt)?;
97        }
98        Ok(last)
99    }
100
101    pub fn run_file(&mut self, source: &str) -> Result<Value, RuntimeError> {
102        let mut items = parse_source(source).map_err(RuntimeError::Error)?;
103        crate::resolver::resolve_program(&mut items);
104
105        // First pass: register all top-level definitions
106        for item in &items {
107            match item {
108                TopLevel::FnDef(fd) => self.exec_fn_def(fd)?,
109                TopLevel::Stmt(s) => {
110                    self.exec_stmt(s)?;
111                }
112                _ => {}
113            }
114        }
115
116        // Second pass: run main() if it exists
117        let main_fn = self.lookup("main");
118        if let Ok(fn_val) = main_fn {
119            let allowed = Self::callable_declared_effects(&fn_val);
120            self.call_value_with_effects_pub(fn_val, vec![], "<main>", allowed)?;
121        }
122
123        Ok(Value::Unit)
124    }
125}
aver/interpreter/exec.rs

aver/interpreter/
exec.rs
