M-Labs/nac3
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basic check for use-before-def

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This commit is contained in:
pca006132 2021-07-22 17:07:49 +08:00
parent c315227a28
commit 88c45172b2
3 changed files with 179 additions and 26 deletions
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175
nac3core/src/typecheck/function_check.rs
View File

@ -1,20 +1,41 @@
use super::type_inferencer::Inferencer;
use super::typedef::Type;
use rustpython_parser::ast::{self, Expr, ExprKind, StmtKind};
use rustpython_parser::ast::{self, Expr, ExprKind, Stmt, StmtKind};
use std::iter::once;
impl<'a> Inferencer<'a> {
fn check_pattern(
&mut self,
pattern: &Expr<Option<Type>>,
defined_identifiers: &mut Vec<String>,
) {
match &pattern.node {
ExprKind::Name { id, .. } => {
if !defined_identifiers.contains(id) {
defined_identifiers.push(id.clone());
}
}
ExprKind::Tuple { elts, .. } => {
for elt in elts.iter() {
self.check_pattern(elt, defined_identifiers);
}
}
_ => unimplemented!(),
}
}
fn check_expr(
&mut self,
expr: &Expr<Option<Type>>,
defined_identifiers: &[String],
) -> Result<(), String> {
// there are some cases where the custom field is None
if let Some(ty) = &expr.custom {
let ty = self.unifier.get_ty(*ty);
let ty = ty.as_ref().borrow();
if ty.is_concrete() {
if !ty.is_concrete() {
return Err(format!(
"expected concrete type at {:?} but got {}",
"expected concrete type at {} but got {}",
expr.location,
ty.get_type_name()
));
@ -23,7 +44,7 @@ impl<'a> Inferencer<'a> {
match &expr.node {
ExprKind::Name { id, .. } => {
if !defined_identifiers.contains(id) {
return Err(format!("unknown identifier {} (use before def?)", id));
return Err(format!("unknown identifier {} (use before def?) at {}", id, expr.location));
}
}
ExprKind::List { elts, .. }
@ -34,14 +55,14 @@ impl<'a> Inferencer<'a> {
}
}
ExprKind::Attribute { value, .. } => {
self.check_expr(value.as_ref(), defined_identifiers)?;
self.check_expr(value, defined_identifiers)?;
}
ExprKind::BinOp { left, right, .. } => {
self.check_expr(left.as_ref(), defined_identifiers)?;
self.check_expr(right.as_ref(), defined_identifiers)?;
self.check_expr(left, defined_identifiers)?;
self.check_expr(right, defined_identifiers)?;
}
ExprKind::UnaryOp { operand, .. } => {
self.check_expr(operand.as_ref(), defined_identifiers)?;
self.check_expr(operand, defined_identifiers)?;
}
ExprKind::Compare {
left, comparators, ..
@ -51,13 +72,13 @@ impl<'a> Inferencer<'a> {
}
}
ExprKind::Subscript { value, slice, .. } => {
self.check_expr(value.as_ref(), defined_identifiers)?;
self.check_expr(slice.as_ref(), defined_identifiers)?;
self.check_expr(value, defined_identifiers)?;
self.check_expr(slice, defined_identifiers)?;
}
ExprKind::IfExp { test, body, orelse } => {
self.check_expr(test.as_ref(), defined_identifiers)?;
self.check_expr(body.as_ref(), defined_identifiers)?;
self.check_expr(orelse.as_ref(), defined_identifiers)?;
self.check_expr(test, defined_identifiers)?;
self.check_expr(body, defined_identifiers)?;
self.check_expr(orelse, defined_identifiers)?;
}
ExprKind::Slice { lower, upper, step } => {
for elt in [lower.as_ref(), upper.as_ref(), step.as_ref()]
@ -67,10 +88,132 @@ impl<'a> Inferencer<'a> {
self.check_expr(elt, defined_identifiers)?;
}
}
ExprKind::ListComp { .. } => unimplemented!(),
ExprKind::Lambda { .. } => unimplemented!(),
_ => {}
ExprKind::Lambda { args, body } => {
let mut defined_identifiers = defined_identifiers.to_vec();
for arg in args.args.iter() {
if !defined_identifiers.contains(&arg.node.arg) {
defined_identifiers.push(arg.node.arg.clone());
}
}
self.check_expr(body, &defined_identifiers)?;
}
ExprKind::ListComp {
elt, generators, ..
} => {
// in our type inference stage, we already make sure that there is only 1 generator
let ast::Comprehension {
target, iter, ifs, ..
} = &generators[0];
self.check_expr(iter, defined_identifiers)?;
let mut defined_identifiers = defined_identifiers.to_vec();
self.check_pattern(target, &mut defined_identifiers);
for term in once(elt.as_ref()).chain(ifs.iter()) {
self.check_expr(term, &defined_identifiers)?;
}
}
ExprKind::Call {
func,
args,
keywords,
} => {
for expr in once(func.as_ref())
.chain(args.iter())
.chain(keywords.iter().map(|v| v.node.value.as_ref()))
{
self.check_expr(expr, defined_identifiers)?;
}
}
ExprKind::Constant { .. } => {}
_ => {
println!("{:?}", expr.node);
unimplemented!()
}
}
Ok(())
}
fn check_stmt(
&mut self,
stmt: &Stmt<Option<Type>>,
defined_identifiers: &mut Vec<String>,
) -> Result<bool, String> {
match &stmt.node {
StmtKind::For {
target,
iter,
body,
orelse,
..
} => {
self.check_expr(iter, defined_identifiers)?;
for stmt in orelse.iter() {
self.check_stmt(stmt, defined_identifiers)?;
}
let mut defined_identifiers = defined_identifiers.clone();
self.check_pattern(target, &mut defined_identifiers);
for stmt in body.iter() {
self.check_stmt(stmt, &mut defined_identifiers)?;
}
Ok(false)
}
StmtKind::If { test, body, orelse } => {
self.check_expr(test, defined_identifiers)?;
let mut body_identifiers = defined_identifiers.clone();
let mut orelse_identifiers = defined_identifiers.clone();
let body_returned = self.check_block(body, &mut body_identifiers)?;
let orelse_returned = self.check_block(orelse, &mut orelse_identifiers)?;
for ident in body_identifiers.iter() {
if !defined_identifiers.contains(ident) && orelse_identifiers.contains(ident) {
defined_identifiers.push(ident.clone())
}
}
Ok(body_returned && orelse_returned)
}
StmtKind::While { test, body, orelse } => {
self.check_expr(test, defined_identifiers)?;
let mut defined_identifiers = defined_identifiers.clone();
self.check_block(body, &mut defined_identifiers)?;
self.check_block(orelse, &mut defined_identifiers)?;
Ok(false)
}
StmtKind::Expr { value } => {
self.check_expr(value, defined_identifiers)?;
Ok(false)
}
StmtKind::Assign { targets, value, .. } => {
self.check_expr(value, defined_identifiers)?;
for target in targets {
self.check_pattern(target, defined_identifiers);
}
Ok(false)
}
StmtKind::AnnAssign { target, value, .. } => {
if let Some(value) = value {
self.check_expr(value, defined_identifiers)?;
self.check_pattern(target, defined_identifiers);
}
Ok(false)
}
// break, return, raise, etc.
_ => Ok(false),
}
}
pub fn check_block(
&mut self,
block: &[Stmt<Option<Type>>],
defined_identifiers: &mut Vec<String>,
) -> Result<bool, String> {
let mut ret = false;
for stmt in block {
if ret {
return Err(format!("dead code at {:?}", stmt.location));
}
if self.check_stmt(stmt, defined_identifiers)? {
ret = true;
}
}
Ok(ret)
}
}

9
nac3core/src/typecheck/type_inferencer/mod.rs
View File

@ -107,6 +107,7 @@ impl<'a> fold::Fold<()> for Inferencer<'a> {
}
}
ast::StmtKind::AnnAssign { .. } | ast::StmtKind::Expr { .. } => {}
ast::StmtKind::Break | ast::StmtKind::Continue => {}
ast::StmtKind::Return { value } => match (value, self.return_type) {
(Some(v), Some(v1)) => {
self.unifier.unify(v.custom.unwrap(), v1)?;
@ -130,12 +131,14 @@ impl<'a> fold::Fold<()> for Inferencer<'a> {
func,
args,
keywords,
} => self.fold_call(node.location, *func, args, keywords)?,
} => {
return self.fold_call(node.location, *func, args, keywords);
}
ast::ExprKind::Lambda { args, body } => {
self.fold_lambda(node.location, *args, *body)?
return self.fold_lambda(node.location, *args, *body);
}
ast::ExprKind::ListComp { elt, generators } => {
self.fold_listcomp(node.location, *elt, generators)?
return self.fold_listcomp(node.location, *elt, generators);
}
_ => fold::fold_expr(self, node)?,
};

21
nac3core/src/typecheck/type_inferencer/test.rs
View File

@ -8,12 +8,12 @@ use rustpython_parser::parser::parse_program;
use test_case::test_case;
struct Resolver {
type_mapping: HashMap<String, Type>,
identifier_mapping: HashMap<String, Type>,
}
impl SymbolResolver for Resolver {
fn get_symbol_type(&mut self, str: &str) -> Option<Type> {
self.type_mapping.get(str).cloned()
self.identifier_mapping.get(str).cloned()
}
fn parse_type_name(&mut self, _: &ast::Expr<()>) -> Option<Type> {
@ -35,12 +35,13 @@ struct TestEnvironment {
pub calls: Vec<Rc<Call>>,
pub primitives: PrimitiveStore,
pub id_to_name: HashMap<usize, String>,
pub identifier_mapping: HashMap<String, Type>,
}
impl TestEnvironment {
fn new() -> TestEnvironment {
let mut unifier = Unifier::new();
let mut type_mapping = HashMap::new();
let mut identifier_mapping = HashMap::new();
let int32 = unifier.add_ty(TypeEnum::TObj {
obj_id: 0,
fields: HashMap::new(),
@ -66,7 +67,7 @@ impl TestEnvironment {
fields: HashMap::new(),
params: HashMap::new(),
});
type_mapping.insert("None".into(), none);
identifier_mapping.insert("None".into(), none);
let primitives = PrimitiveStore {
int32,
@ -84,7 +85,7 @@ impl TestEnvironment {
params: [(id, v0)].iter().cloned().collect(),
});
type_mapping.insert(
identifier_mapping.insert(
"Foo".into(),
unifier.add_ty(TypeEnum::TFunc(FunSignature {
args: vec![],
@ -105,13 +106,14 @@ impl TestEnvironment {
.cloned()
.collect();
let resolver = Box::new(Resolver { type_mapping }) as Box<dyn SymbolResolver>;
let resolver = Box::new(Resolver { identifier_mapping: identifier_mapping.clone() }) as Box<dyn SymbolResolver>;
TestEnvironment {
unifier,
resolver,
primitives,
id_to_name,
identifier_mapping,
calls: Vec::new(),
}
}
@ -168,15 +170,20 @@ impl TestEnvironment {
[("a", "list[int32]"), ("b", "list[bool]"), ("f", "fn[[x=int32], bool]")].iter().cloned().collect()
; "listcomp test")]
fn test_basic(source: &str, mapping: HashMap<&str, &str>) {
println!("source:\n{}", source);
let mut env = TestEnvironment::new();
let id_to_name = std::mem::take(&mut env.id_to_name);
let mut defined_identifiers = env.identifier_mapping.keys().cloned().collect();
let mut inferencer = env.get_inferencer();
let statements = parse_program(source).unwrap();
statements
let statements = statements
.into_iter()
.map(|v| inferencer.fold_stmt(v))
.collect::<Result<Vec<_>, _>>()
.unwrap();
inferencer.check_block(&statements, &mut defined_identifiers).unwrap();
for (k, v) in inferencer.variable_mapping.iter() {
let name = inferencer.unifier.stringify(
*v,