forked from M-Labs/nac3
1246 lines
52 KiB
Rust
1246 lines
52 KiB
Rust
use std::collections::{HashMap, HashSet};
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use std::convert::{From, TryInto};
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use std::iter::once;
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use std::{cell::RefCell, sync::Arc};
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use super::typedef::{Call, FunSignature, FuncArg, RecordField, Type, TypeEnum, Unifier};
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use super::{magic_methods::*, typedef::CallId};
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use crate::{symbol_resolver::SymbolResolver, toplevel::TopLevelContext};
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use itertools::izip;
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use nac3parser::ast::{
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self,
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fold::{self, Fold},
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Arguments, Comprehension, ExprContext, ExprKind, Located, Location, StrRef,
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};
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#[cfg(test)]
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mod test;
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#[derive(PartialEq, Eq, Hash, Copy, Clone, Debug)]
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pub struct CodeLocation {
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row: usize,
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col: usize,
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}
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impl From<Location> for CodeLocation {
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fn from(loc: Location) -> CodeLocation {
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CodeLocation { row: loc.row(), col: loc.column() }
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}
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}
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#[derive(Clone, Copy)]
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pub struct PrimitiveStore {
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pub int32: Type,
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pub int64: Type,
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pub uint32: Type,
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pub uint64: Type,
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pub float: Type,
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pub bool: Type,
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pub none: Type,
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pub range: Type,
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pub str: Type,
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pub exception: Type,
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pub option: Type,
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}
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pub struct FunctionData {
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pub resolver: Arc<dyn SymbolResolver + Send + Sync>,
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pub return_type: Option<Type>,
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pub bound_variables: Vec<Type>,
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}
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pub struct Inferencer<'a> {
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pub top_level: &'a TopLevelContext,
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pub defined_identifiers: HashSet<StrRef>,
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pub function_data: &'a mut FunctionData,
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pub unifier: &'a mut Unifier,
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pub primitives: &'a PrimitiveStore,
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pub virtual_checks: &'a mut Vec<(Type, Type, Location)>,
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pub variable_mapping: HashMap<StrRef, Type>,
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pub calls: &'a mut HashMap<CodeLocation, CallId>,
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pub in_handler: bool,
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}
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struct NaiveFolder();
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impl fold::Fold<()> for NaiveFolder {
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type TargetU = Option<Type>;
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type Error = String;
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fn map_user(&mut self, _: ()) -> Result<Self::TargetU, Self::Error> {
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Ok(None)
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}
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}
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fn report_error<T>(msg: &str, location: Location) -> Result<T, String> {
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Err(format!("{} at {}", msg, location))
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}
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impl<'a> fold::Fold<()> for Inferencer<'a> {
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type TargetU = Option<Type>;
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type Error = String;
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fn map_user(&mut self, _: ()) -> Result<Self::TargetU, Self::Error> {
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Ok(None)
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}
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fn fold_stmt(
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&mut self,
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mut node: ast::Stmt<()>,
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) -> Result<ast::Stmt<Self::TargetU>, Self::Error> {
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let stmt = match node.node {
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// we don't want fold over type annotation
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ast::StmtKind::AnnAssign { mut target, annotation, value, simple, config_comment } => {
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self.infer_pattern(&target)?;
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// fix parser problem...
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if let ExprKind::Attribute { ctx, .. } = &mut target.node {
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*ctx = ExprContext::Store;
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}
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let target = Box::new(self.fold_expr(*target)?);
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let value = if let Some(v) = value {
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let ty = Box::new(self.fold_expr(*v)?);
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self.unify(target.custom.unwrap(), ty.custom.unwrap(), &node.location)?;
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Some(ty)
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} else {
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return report_error(
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"declaration without definition is not yet supported",
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node.location,
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);
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};
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let top_level_defs = self.top_level.definitions.read();
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let annotation_type = self.function_data.resolver.parse_type_annotation(
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top_level_defs.as_slice(),
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self.unifier,
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self.primitives,
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annotation.as_ref(),
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)?;
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self.unify(annotation_type, target.custom.unwrap(), &node.location)?;
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let annotation = Box::new(NaiveFolder().fold_expr(*annotation)?);
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Located {
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location: node.location,
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custom: None,
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node: ast::StmtKind::AnnAssign {
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target,
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annotation,
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value,
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simple,
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config_comment,
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},
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}
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}
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ast::StmtKind::Try { body, handlers, orelse, finalbody, config_comment } => {
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let body = body
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.into_iter()
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.map(|stmt| self.fold_stmt(stmt))
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.collect::<Result<Vec<_>, _>>()?;
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let outer_in_handler = self.in_handler;
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let mut exception_handlers = Vec::with_capacity(handlers.len());
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self.in_handler = true;
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{
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let top_level_defs = self.top_level.definitions.read();
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let mut naive_folder = NaiveFolder();
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for handler in handlers.into_iter() {
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let ast::ExcepthandlerKind::ExceptHandler { type_, name, body } =
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handler.node;
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let type_ = if let Some(type_) = type_ {
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let typ = self.function_data.resolver.parse_type_annotation(
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top_level_defs.as_slice(),
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self.unifier,
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self.primitives,
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&type_,
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)?;
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self.virtual_checks.push((
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typ,
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self.primitives.exception,
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handler.location,
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));
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if let Some(name) = name {
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if !self.defined_identifiers.contains(&name) {
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self.defined_identifiers.insert(name);
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}
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if let Some(old_typ) = self.variable_mapping.insert(name, typ) {
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let loc = handler.location;
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self.unifier.unify(old_typ, typ).map_err(|e| {
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e.at(Some(loc)).to_display(self.unifier).to_string()
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})?;
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}
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}
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let mut type_ = naive_folder.fold_expr(*type_)?;
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type_.custom = Some(typ);
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Some(Box::new(type_))
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} else {
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None
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};
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let body = body
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.into_iter()
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.map(|stmt| self.fold_stmt(stmt))
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.collect::<Result<Vec<_>, _>>()?;
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exception_handlers.push(Located {
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location: handler.location,
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node: ast::ExcepthandlerKind::ExceptHandler { type_, name, body },
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custom: None,
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});
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}
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}
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self.in_handler = outer_in_handler;
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let handlers = exception_handlers;
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let orelse = orelse.into_iter().map(|stmt| self.fold_stmt(stmt)).collect::<Result<
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Vec<_>,
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_,
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>>(
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)?;
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let finalbody = finalbody
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.into_iter()
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.map(|stmt| self.fold_stmt(stmt))
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.collect::<Result<Vec<_>, _>>()?;
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Located {
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location: node.location,
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node: ast::StmtKind::Try { body, handlers, orelse, finalbody, config_comment },
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custom: None,
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}
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}
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ast::StmtKind::For { target, iter, body, orelse, config_comment, type_comment } => {
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self.infer_pattern(&target)?;
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let target = self.fold_expr(*target)?;
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let iter = self.fold_expr(*iter)?;
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if self.unifier.unioned(iter.custom.unwrap(), self.primitives.range) {
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self.unify(self.primitives.int32, target.custom.unwrap(), &target.location)?;
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} else {
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let list = self.unifier.add_ty(TypeEnum::TList { ty: target.custom.unwrap() });
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self.unify(list, iter.custom.unwrap(), &iter.location)?;
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}
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let body =
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body.into_iter().map(|b| self.fold_stmt(b)).collect::<Result<Vec<_>, _>>()?;
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let orelse =
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orelse.into_iter().map(|o| self.fold_stmt(o)).collect::<Result<Vec<_>, _>>()?;
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Located {
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location: node.location,
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node: ast::StmtKind::For {
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target: Box::new(target),
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iter: Box::new(iter),
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body,
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orelse,
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config_comment,
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type_comment,
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},
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custom: None,
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}
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}
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ast::StmtKind::Assign { ref mut targets, ref config_comment, .. } => {
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for target in targets.iter_mut() {
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if let ExprKind::Attribute { ctx, .. } = &mut target.node {
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*ctx = ExprContext::Store;
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}
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}
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if targets.iter().all(|t| matches!(t.node, ast::ExprKind::Name { .. })) {
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if let ast::StmtKind::Assign { targets, value, .. } = node.node {
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let value = self.fold_expr(*value)?;
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let value_ty = value.custom.unwrap();
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let targets: Result<Vec<_>, _> = targets
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.into_iter()
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.map(|target| {
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if let ast::ExprKind::Name { id, ctx } = target.node {
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self.defined_identifiers.insert(id);
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let target_ty = if let Some(ty) = self.variable_mapping.get(&id)
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{
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*ty
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} else {
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let unifier = &mut self.unifier;
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self.function_data
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.resolver
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.get_symbol_type(
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unifier,
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&self.top_level.definitions.read(),
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self.primitives,
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id,
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)
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.unwrap_or_else(|_| {
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self.variable_mapping.insert(id, value_ty);
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value_ty
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})
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};
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let location = target.location;
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self.unifier.unify(value_ty, target_ty).map(|_| Located {
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location,
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node: ast::ExprKind::Name { id, ctx },
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custom: Some(target_ty),
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})
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} else {
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unreachable!()
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}
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})
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.collect();
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let loc = node.location;
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let targets = targets
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.map_err(|e| e.at(Some(loc)).to_display(self.unifier).to_string())?;
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return Ok(Located {
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location: node.location,
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node: ast::StmtKind::Assign {
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targets,
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value: Box::new(value),
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type_comment: None,
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config_comment: config_comment.clone(),
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},
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custom: None,
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});
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} else {
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unreachable!()
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}
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}
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for target in targets {
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self.infer_pattern(target)?;
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}
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fold::fold_stmt(self, node)?
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}
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ast::StmtKind::With { ref items, .. } => {
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for item in items.iter() {
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if let Some(var) = &item.optional_vars {
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self.infer_pattern(var)?;
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}
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}
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fold::fold_stmt(self, node)?
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}
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_ => fold::fold_stmt(self, node)?,
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};
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match &stmt.node {
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ast::StmtKind::For { .. } => {}
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ast::StmtKind::Try { .. } => {}
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ast::StmtKind::If { test, .. } | ast::StmtKind::While { test, .. } => {
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self.unify(test.custom.unwrap(), self.primitives.bool, &test.location)?;
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}
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ast::StmtKind::Assign { targets, value, .. } => {
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for target in targets.iter() {
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self.unify(target.custom.unwrap(), value.custom.unwrap(), &target.location)?;
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}
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}
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ast::StmtKind::AnnAssign { .. } | ast::StmtKind::Expr { .. } => {}
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ast::StmtKind::Break { .. }
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| ast::StmtKind::Continue { .. }
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| ast::StmtKind::Pass { .. } => {}
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ast::StmtKind::Raise { exc, cause, .. } => {
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if let Some(cause) = cause {
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return report_error("raise ... from cause is not supported", cause.location);
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}
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if let Some(exc) = exc {
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self.virtual_checks.push((
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exc.custom.unwrap(),
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self.primitives.exception,
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exc.location,
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));
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} else if !self.in_handler {
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return report_error(
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"cannot reraise outside exception handlers",
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stmt.location,
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);
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}
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}
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ast::StmtKind::With { items, .. } => {
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for item in items.iter() {
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let ty = item.context_expr.custom.unwrap();
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// if we can simply unify without creating new types...
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let mut fast_path = false;
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if let TypeEnum::TObj { fields, .. } = &*self.unifier.get_ty(ty) {
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fast_path = true;
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if let Some(enter) = fields.get(&"__enter__".into()).cloned() {
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if let TypeEnum::TFunc(signature) = &*self.unifier.get_ty(enter.0) {
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if !signature.args.is_empty() {
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return report_error(
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"__enter__ method should take no argument other than self",
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stmt.location,
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);
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}
|
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if let Some(var) = &item.optional_vars {
|
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if signature.vars.is_empty() {
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self.unify(
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signature.ret,
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var.custom.unwrap(),
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&stmt.location,
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)?;
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} else {
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fast_path = false;
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}
|
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}
|
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} else {
|
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fast_path = false;
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}
|
|
} else {
|
|
return report_error(
|
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"__enter__ method is required for context manager",
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stmt.location,
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);
|
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}
|
|
if let Some(exit) = fields.get(&"__exit__".into()).cloned() {
|
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if let TypeEnum::TFunc(signature) = &*self.unifier.get_ty(exit.0) {
|
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if !signature.args.is_empty() {
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return report_error(
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"__exit__ method should take no argument other than self",
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stmt.location,
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);
|
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}
|
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} else {
|
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fast_path = false;
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}
|
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} else {
|
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return report_error(
|
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"__exit__ method is required for context manager",
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stmt.location,
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);
|
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}
|
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}
|
|
if !fast_path {
|
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let enter = TypeEnum::TFunc(FunSignature {
|
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args: vec![],
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ret: item.optional_vars.as_ref().map_or_else(
|
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|| self.unifier.get_dummy_var().0,
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|var| var.custom.unwrap(),
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),
|
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vars: Default::default(),
|
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});
|
|
let enter = self.unifier.add_ty(enter);
|
|
let exit = TypeEnum::TFunc(FunSignature {
|
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args: vec![],
|
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ret: self.unifier.get_dummy_var().0,
|
|
vars: Default::default(),
|
|
});
|
|
let exit = self.unifier.add_ty(exit);
|
|
let mut fields = HashMap::new();
|
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fields.insert("__enter__".into(), RecordField::new(enter, false, None));
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fields.insert("__exit__".into(), RecordField::new(exit, false, None));
|
|
let record = self.unifier.add_record(fields);
|
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self.unify(ty, record, &stmt.location)?;
|
|
}
|
|
}
|
|
}
|
|
ast::StmtKind::Return { value, .. } => match (value, self.function_data.return_type) {
|
|
(Some(v), Some(v1)) => {
|
|
self.unify(v.custom.unwrap(), v1, &v.location)?;
|
|
}
|
|
(Some(_), None) => {
|
|
return report_error("Unexpected return value", stmt.location);
|
|
}
|
|
(None, Some(_)) => {
|
|
return report_error("Expected return value", stmt.location);
|
|
}
|
|
(None, None) => {}
|
|
},
|
|
ast::StmtKind::AugAssign { target, op, value, .. } => {
|
|
let res_ty = self.infer_bin_ops(stmt.location, target, op, value, true)?;
|
|
self.unify(res_ty, target.custom.unwrap(), &stmt.location)?;
|
|
}
|
|
ast::StmtKind::Assert { test, msg, .. } => {
|
|
self.unify(test.custom.unwrap(), self.primitives.bool, &test.location)?;
|
|
match msg {
|
|
Some(m) => self.unify(m.custom.unwrap(), self.primitives.str, &m.location)?,
|
|
None => (),
|
|
}
|
|
}
|
|
_ => return report_error("Unsupported statement type", stmt.location),
|
|
};
|
|
Ok(stmt)
|
|
}
|
|
|
|
fn fold_expr(&mut self, node: ast::Expr<()>) -> Result<ast::Expr<Self::TargetU>, Self::Error> {
|
|
let expr = match node.node {
|
|
ast::ExprKind::Call { func, args, keywords } => {
|
|
return self.fold_call(node.location, *func, args, keywords);
|
|
}
|
|
ast::ExprKind::Lambda { args, body } => {
|
|
return self.fold_lambda(node.location, *args, *body);
|
|
}
|
|
ast::ExprKind::ListComp { elt, generators } => {
|
|
return self.fold_listcomp(node.location, *elt, generators);
|
|
}
|
|
_ => fold::fold_expr(self, node)?,
|
|
};
|
|
let custom = match &expr.node {
|
|
ast::ExprKind::Constant { value, .. } => {
|
|
Some(self.infer_constant(value, &expr.location)?)
|
|
}
|
|
ast::ExprKind::Name { id, .. } => {
|
|
// the name `none` is special since it may have different types
|
|
if id == &"none".into() {
|
|
if let TypeEnum::TObj { params, .. } =
|
|
self.unifier.get_ty_immutable(self.primitives.option).as_ref()
|
|
{
|
|
let var_map = params
|
|
.iter()
|
|
.map(|(id_var, ty)| {
|
|
if let TypeEnum::TVar { id, range, name, loc, .. } =
|
|
&*self.unifier.get_ty(*ty)
|
|
{
|
|
assert_eq!(*id, *id_var);
|
|
(
|
|
*id,
|
|
self.unifier.get_fresh_var_with_range(range, *name, *loc).0,
|
|
)
|
|
} else {
|
|
unreachable!()
|
|
}
|
|
})
|
|
.collect::<HashMap<_, _>>();
|
|
Some(self.unifier.subst(self.primitives.option, &var_map).unwrap())
|
|
} else {
|
|
unreachable!("must be tobj")
|
|
}
|
|
} else {
|
|
if !self.defined_identifiers.contains(id) {
|
|
match self.function_data.resolver.get_symbol_type(
|
|
self.unifier,
|
|
&self.top_level.definitions.read(),
|
|
self.primitives,
|
|
*id,
|
|
) {
|
|
Ok(_) => {
|
|
self.defined_identifiers.insert(*id);
|
|
}
|
|
Err(e) => {
|
|
return report_error(
|
|
&format!("type error at identifier `{}` ({})", id, e),
|
|
expr.location,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
Some(self.infer_identifier(*id)?)
|
|
}
|
|
}
|
|
ast::ExprKind::List { elts, .. } => Some(self.infer_list(elts)?),
|
|
ast::ExprKind::Tuple { elts, .. } => Some(self.infer_tuple(elts)?),
|
|
ast::ExprKind::Attribute { value, attr, ctx } => {
|
|
Some(self.infer_attribute(value, *attr, ctx)?)
|
|
}
|
|
ast::ExprKind::BoolOp { values, .. } => Some(self.infer_bool_ops(values)?),
|
|
ast::ExprKind::BinOp { left, op, right } => {
|
|
Some(self.infer_bin_ops(expr.location, left, op, right, false)?)
|
|
}
|
|
ast::ExprKind::UnaryOp { op, operand } => Some(self.infer_unary_ops(op, operand)?),
|
|
ast::ExprKind::Compare { left, ops, comparators } => {
|
|
Some(self.infer_compare(left, ops, comparators)?)
|
|
}
|
|
ast::ExprKind::Subscript { value, slice, ctx, .. } => {
|
|
Some(self.infer_subscript(value.as_ref(), slice.as_ref(), ctx)?)
|
|
}
|
|
ast::ExprKind::IfExp { test, body, orelse } => {
|
|
Some(self.infer_if_expr(test, body.as_ref(), orelse.as_ref())?)
|
|
}
|
|
ast::ExprKind::ListComp { .. }
|
|
| ast::ExprKind::Lambda { .. }
|
|
| ast::ExprKind::Call { .. } => expr.custom, // already computed
|
|
ast::ExprKind::Slice { .. } => None, // we don't need it for slice
|
|
_ => return report_error("not supported", expr.location),
|
|
};
|
|
Ok(ast::Expr { custom, location: expr.location, node: expr.node })
|
|
}
|
|
}
|
|
|
|
type InferenceResult = Result<Type, String>;
|
|
|
|
impl<'a> Inferencer<'a> {
|
|
/// Constrain a <: b
|
|
/// Currently implemented as unification
|
|
fn constrain(&mut self, a: Type, b: Type, location: &Location) -> Result<(), String> {
|
|
self.unify(a, b, location)
|
|
}
|
|
|
|
fn unify(&mut self, a: Type, b: Type, location: &Location) -> Result<(), String> {
|
|
self.unifier
|
|
.unify(a, b)
|
|
.map_err(|e| e.at(Some(*location)).to_display(self.unifier).to_string())
|
|
}
|
|
|
|
fn infer_pattern(&mut self, pattern: &ast::Expr<()>) -> Result<(), String> {
|
|
match &pattern.node {
|
|
ExprKind::Name { id, .. } => {
|
|
if !self.defined_identifiers.contains(id) {
|
|
self.defined_identifiers.insert(*id);
|
|
}
|
|
Ok(())
|
|
}
|
|
ExprKind::Tuple { elts, .. } => {
|
|
for elt in elts.iter() {
|
|
self.infer_pattern(elt)?;
|
|
}
|
|
Ok(())
|
|
}
|
|
_ => Ok(()),
|
|
}
|
|
}
|
|
|
|
fn build_method_call(
|
|
&mut self,
|
|
location: Location,
|
|
method: StrRef,
|
|
obj: Type,
|
|
params: Vec<Type>,
|
|
ret: Option<Type>,
|
|
) -> InferenceResult {
|
|
if let TypeEnum::TObj { params: class_params, fields, .. } = &*self.unifier.get_ty(obj) {
|
|
if class_params.is_empty() {
|
|
if let Some(ty) = fields.get(&method) {
|
|
let ty = ty.0;
|
|
if let TypeEnum::TFunc(sign) = &*self.unifier.get_ty(ty) {
|
|
if sign.vars.is_empty() {
|
|
let call = Call {
|
|
posargs: params,
|
|
kwargs: HashMap::new(),
|
|
ret: sign.ret,
|
|
fun: RefCell::new(None),
|
|
loc: Some(location),
|
|
};
|
|
if let Some(ret) = ret {
|
|
self.unifier.unify(sign.ret, ret).unwrap();
|
|
}
|
|
let required: Vec<_> = sign
|
|
.args
|
|
.iter()
|
|
.filter(|v| v.default_value.is_none())
|
|
.map(|v| v.name)
|
|
.rev()
|
|
.collect();
|
|
self.unifier.unify_call(&call, ty, sign, &required).map_err(|e| {
|
|
e.at(Some(location)).to_display(self.unifier).to_string()
|
|
})?;
|
|
return Ok(sign.ret);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
let ret = ret.unwrap_or_else(|| self.unifier.get_dummy_var().0);
|
|
|
|
let call = self.unifier.add_call(Call {
|
|
posargs: params,
|
|
kwargs: HashMap::new(),
|
|
ret,
|
|
fun: RefCell::new(None),
|
|
loc: Some(location),
|
|
});
|
|
self.calls.insert(location.into(), call);
|
|
let call = self.unifier.add_ty(TypeEnum::TCall(vec![call]));
|
|
let fields = once((method.into(), RecordField::new(call, false, Some(location)))).collect();
|
|
let record = self.unifier.add_record(fields);
|
|
self.constrain(obj, record, &location)?;
|
|
Ok(ret)
|
|
}
|
|
|
|
fn fold_lambda(
|
|
&mut self,
|
|
location: Location,
|
|
args: Arguments,
|
|
body: ast::Expr<()>,
|
|
) -> Result<ast::Expr<Option<Type>>, String> {
|
|
if !args.posonlyargs.is_empty()
|
|
|| args.vararg.is_some()
|
|
|| !args.kwonlyargs.is_empty()
|
|
|| args.kwarg.is_some()
|
|
|| !args.defaults.is_empty()
|
|
{
|
|
// actually I'm not sure whether programs violating this is a valid python program.
|
|
return report_error(
|
|
"We only support positional or keyword arguments without defaults for lambdas",
|
|
if args.args.is_empty() { body.location } else { args.args[0].location },
|
|
);
|
|
}
|
|
|
|
let mut defined_identifiers = self.defined_identifiers.clone();
|
|
for arg in args.args.iter() {
|
|
let name = &arg.node.arg;
|
|
if !defined_identifiers.contains(name) {
|
|
defined_identifiers.insert(*name);
|
|
}
|
|
}
|
|
let fn_args: Vec<_> = args
|
|
.args
|
|
.iter()
|
|
.map(|v| (v.node.arg, self.unifier.get_fresh_var(Some(v.node.arg), Some(v.location)).0))
|
|
.collect();
|
|
let mut variable_mapping = self.variable_mapping.clone();
|
|
variable_mapping.extend(fn_args.iter().cloned());
|
|
let ret = self.unifier.get_dummy_var().0;
|
|
|
|
let mut new_context = Inferencer {
|
|
function_data: self.function_data,
|
|
unifier: self.unifier,
|
|
primitives: self.primitives,
|
|
virtual_checks: self.virtual_checks,
|
|
calls: self.calls,
|
|
top_level: self.top_level,
|
|
defined_identifiers,
|
|
variable_mapping,
|
|
// lambda should not be considered in exception handler
|
|
in_handler: false,
|
|
};
|
|
let fun = FunSignature {
|
|
args: fn_args
|
|
.iter()
|
|
.map(|(k, ty)| FuncArg { name: *k, ty: *ty, default_value: None })
|
|
.collect(),
|
|
ret,
|
|
vars: Default::default(),
|
|
};
|
|
let body = new_context.fold_expr(body)?;
|
|
new_context.unify(fun.ret, body.custom.unwrap(), &location)?;
|
|
let mut args = new_context.fold_arguments(args)?;
|
|
for (arg, (name, ty)) in args.args.iter_mut().zip(fn_args.iter()) {
|
|
assert_eq!(&arg.node.arg, name);
|
|
arg.custom = Some(*ty);
|
|
}
|
|
Ok(Located {
|
|
location,
|
|
node: ExprKind::Lambda { args: args.into(), body: body.into() },
|
|
custom: Some(self.unifier.add_ty(TypeEnum::TFunc(fun))),
|
|
})
|
|
}
|
|
|
|
fn fold_listcomp(
|
|
&mut self,
|
|
location: Location,
|
|
elt: ast::Expr<()>,
|
|
mut generators: Vec<Comprehension>,
|
|
) -> Result<ast::Expr<Option<Type>>, String> {
|
|
if generators.len() != 1 {
|
|
return report_error(
|
|
"Only 1 generator statement for list comprehension is supported",
|
|
generators[0].target.location,
|
|
);
|
|
}
|
|
let variable_mapping = self.variable_mapping.clone();
|
|
let defined_identifiers = self.defined_identifiers.clone();
|
|
let mut new_context = Inferencer {
|
|
function_data: self.function_data,
|
|
unifier: self.unifier,
|
|
virtual_checks: self.virtual_checks,
|
|
top_level: self.top_level,
|
|
variable_mapping,
|
|
primitives: self.primitives,
|
|
calls: self.calls,
|
|
defined_identifiers,
|
|
// listcomp expr should not be considered as inside an exception handler...
|
|
in_handler: false,
|
|
};
|
|
let generator = generators.pop().unwrap();
|
|
if generator.is_async {
|
|
return report_error("Async iterator not supported", generator.target.location);
|
|
}
|
|
new_context.infer_pattern(&generator.target)?;
|
|
let target = new_context.fold_expr(*generator.target)?;
|
|
let iter = new_context.fold_expr(*generator.iter)?;
|
|
if new_context.unifier.unioned(iter.custom.unwrap(), new_context.primitives.range) {
|
|
new_context.unify(
|
|
target.custom.unwrap(),
|
|
new_context.primitives.int32,
|
|
&target.location,
|
|
)?;
|
|
} else {
|
|
let list = new_context.unifier.add_ty(TypeEnum::TList { ty: target.custom.unwrap() });
|
|
new_context.unify(iter.custom.unwrap(), list, &iter.location)?;
|
|
}
|
|
let ifs: Vec<_> = generator
|
|
.ifs
|
|
.into_iter()
|
|
.map(|v| new_context.fold_expr(v))
|
|
.collect::<Result<_, _>>()?;
|
|
|
|
let elt = new_context.fold_expr(elt)?;
|
|
// iter should be a list of targets...
|
|
// actually it should be an iterator of targets, but we don't have iter type for now
|
|
// if conditions should be bool
|
|
for v in ifs.iter() {
|
|
new_context.unify(v.custom.unwrap(), new_context.primitives.bool, &v.location)?;
|
|
}
|
|
|
|
Ok(Located {
|
|
location,
|
|
custom: Some(new_context.unifier.add_ty(TypeEnum::TList { ty: elt.custom.unwrap() })),
|
|
node: ExprKind::ListComp {
|
|
elt: Box::new(elt),
|
|
generators: vec![ast::Comprehension {
|
|
target: Box::new(target),
|
|
iter: Box::new(iter),
|
|
ifs,
|
|
is_async: false,
|
|
}],
|
|
},
|
|
})
|
|
}
|
|
|
|
fn fold_call(
|
|
&mut self,
|
|
location: Location,
|
|
func: ast::Expr<()>,
|
|
mut args: Vec<ast::Expr<()>>,
|
|
keywords: Vec<Located<ast::KeywordData>>,
|
|
) -> Result<ast::Expr<Option<Type>>, String> {
|
|
let func =
|
|
if let Located { location: func_location, custom, node: ExprKind::Name { id, ctx } } =
|
|
func
|
|
{
|
|
// handle special functions that cannot be typed in the usual way...
|
|
if id == "virtual".into() {
|
|
if args.is_empty() || args.len() > 2 || !keywords.is_empty() {
|
|
return report_error(
|
|
"`virtual` can only accept 1/2 positional arguments",
|
|
func_location,
|
|
);
|
|
}
|
|
let arg0 = self.fold_expr(args.remove(0))?;
|
|
let ty = if let Some(arg) = args.pop() {
|
|
let top_level_defs = self.top_level.definitions.read();
|
|
self.function_data.resolver.parse_type_annotation(
|
|
top_level_defs.as_slice(),
|
|
self.unifier,
|
|
self.primitives,
|
|
&arg,
|
|
)?
|
|
} else {
|
|
self.unifier.get_dummy_var().0
|
|
};
|
|
self.virtual_checks.push((arg0.custom.unwrap(), ty, func_location));
|
|
let custom = Some(self.unifier.add_ty(TypeEnum::TVirtual { ty }));
|
|
return Ok(Located {
|
|
location,
|
|
custom,
|
|
node: ExprKind::Call {
|
|
func: Box::new(Located {
|
|
custom: None,
|
|
location: func.location,
|
|
node: ExprKind::Name { id, ctx },
|
|
}),
|
|
args: vec![arg0],
|
|
keywords: vec![],
|
|
},
|
|
});
|
|
}
|
|
// int64 is special because its argument can be a constant larger than int32
|
|
if id == "int64".into() && args.len() == 1 {
|
|
if let ExprKind::Constant { value: ast::Constant::Int(val), kind } =
|
|
&args[0].node
|
|
{
|
|
let custom = Some(self.primitives.int64);
|
|
let v: Result<i64, _> = (*val).try_into();
|
|
if v.is_ok() {
|
|
return Ok(Located {
|
|
location: args[0].location,
|
|
custom,
|
|
node: ExprKind::Constant {
|
|
value: ast::Constant::Int(*val),
|
|
kind: kind.clone(),
|
|
},
|
|
});
|
|
} else {
|
|
return report_error("Integer out of bound", args[0].location);
|
|
}
|
|
}
|
|
}
|
|
if id == "uint32".into() && args.len() == 1 {
|
|
if let ExprKind::Constant { value: ast::Constant::Int(val), kind } =
|
|
&args[0].node
|
|
{
|
|
let custom = Some(self.primitives.uint32);
|
|
let v: Result<u32, _> = (*val).try_into();
|
|
if v.is_ok() {
|
|
return Ok(Located {
|
|
location: args[0].location,
|
|
custom,
|
|
node: ExprKind::Constant {
|
|
value: ast::Constant::Int(*val),
|
|
kind: kind.clone(),
|
|
},
|
|
});
|
|
} else {
|
|
return report_error("Integer out of bound", args[0].location);
|
|
}
|
|
}
|
|
}
|
|
if id == "uint64".into() && args.len() == 1 {
|
|
if let ExprKind::Constant { value: ast::Constant::Int(val), kind } =
|
|
&args[0].node
|
|
{
|
|
let custom = Some(self.primitives.uint64);
|
|
let v: Result<u64, _> = (*val).try_into();
|
|
if v.is_ok() {
|
|
return Ok(Located {
|
|
location: args[0].location,
|
|
custom,
|
|
node: ExprKind::Constant {
|
|
value: ast::Constant::Int(*val),
|
|
kind: kind.clone(),
|
|
},
|
|
});
|
|
} else {
|
|
return report_error("Integer out of bound", args[0].location);
|
|
}
|
|
}
|
|
}
|
|
// array() is a "magic" function call that determines the number of
|
|
// dimensions in the result from the nesting of the array argument type,
|
|
// to match the host Python NumPy API.
|
|
if id == "array".into() {
|
|
if args.is_empty() {
|
|
return report_error(
|
|
"`array()` expects at least one argument (contents in list form)",
|
|
func_location,
|
|
);
|
|
}
|
|
|
|
if args.len() > 2 || !keywords.is_empty() {
|
|
return report_error(
|
|
"Additional `array()` arguments not yet implemented",
|
|
func_location,
|
|
);
|
|
// TODO: Implement `dtype=` kwarg.
|
|
}
|
|
|
|
let list_arg = self.fold_expr(args.remove(0))?;
|
|
// TODO: Implement special case for emtpy arrays (e.g. `array([[]]))`)
|
|
// to match NumPy.
|
|
|
|
let mut num_dims = 0;
|
|
let mut elem_type = list_arg.custom.unwrap();
|
|
while let TypeEnum::TList { ty } = &*self.unifier.get_ty(elem_type) {
|
|
elem_type = *ty;
|
|
num_dims += 1;
|
|
}
|
|
if num_dims == 0 {
|
|
return report_error(
|
|
"expected list argument to array(), not xxx",
|
|
func_location,
|
|
);
|
|
}
|
|
|
|
let custom =
|
|
Some(self.unifier.add_ty(TypeEnum::TNDArray { ty: elem_type, num_dims }));
|
|
return Ok(Located {
|
|
location,
|
|
custom,
|
|
node: ExprKind::Call {
|
|
func: Box::new(Located {
|
|
custom: None,
|
|
location: func.location,
|
|
node: ExprKind::Name { id, ctx },
|
|
}),
|
|
args: vec![list_arg],
|
|
keywords: vec![],
|
|
},
|
|
});
|
|
}
|
|
Located { location: func_location, custom, node: ExprKind::Name { id, ctx } }
|
|
} else {
|
|
func
|
|
};
|
|
let func = Box::new(self.fold_expr(func)?);
|
|
let args = args.into_iter().map(|v| self.fold_expr(v)).collect::<Result<Vec<_>, _>>()?;
|
|
let keywords = keywords
|
|
.into_iter()
|
|
.map(|v| fold::fold_keyword(self, v))
|
|
.collect::<Result<Vec<_>, _>>()?;
|
|
|
|
if let TypeEnum::TFunc(sign) = &*self.unifier.get_ty(func.custom.unwrap()) {
|
|
if sign.vars.is_empty() {
|
|
let call = Call {
|
|
posargs: args.iter().map(|v| v.custom.unwrap()).collect(),
|
|
kwargs: keywords
|
|
.iter()
|
|
.map(|v| (*v.node.arg.as_ref().unwrap(), v.node.value.custom.unwrap()))
|
|
.collect(),
|
|
fun: RefCell::new(None),
|
|
ret: sign.ret,
|
|
loc: Some(location),
|
|
};
|
|
let required: Vec<_> = sign
|
|
.args
|
|
.iter()
|
|
.filter(|v| v.default_value.is_none())
|
|
.map(|v| v.name)
|
|
.rev()
|
|
.collect();
|
|
self.unifier
|
|
.unify_call(&call, func.custom.unwrap(), sign, &required)
|
|
.map_err(|e| e.at(Some(location)).to_display(self.unifier).to_string())?;
|
|
return Ok(Located {
|
|
location,
|
|
custom: Some(sign.ret),
|
|
node: ExprKind::Call { func, args, keywords },
|
|
});
|
|
}
|
|
}
|
|
|
|
let ret = self.unifier.get_dummy_var().0;
|
|
let call = self.unifier.add_call(Call {
|
|
posargs: args.iter().map(|v| v.custom.unwrap()).collect(),
|
|
kwargs: keywords
|
|
.iter()
|
|
.map(|v| (*v.node.arg.as_ref().unwrap(), v.custom.unwrap()))
|
|
.collect(),
|
|
fun: RefCell::new(None),
|
|
ret,
|
|
loc: Some(location),
|
|
});
|
|
self.calls.insert(location.into(), call);
|
|
let call = self.unifier.add_ty(TypeEnum::TCall(vec![call]));
|
|
self.unify(func.custom.unwrap(), call, &func.location)?;
|
|
|
|
Ok(Located { location, custom: Some(ret), node: ExprKind::Call { func, args, keywords } })
|
|
}
|
|
|
|
fn infer_identifier(&mut self, id: StrRef) -> InferenceResult {
|
|
if let Some(ty) = self.variable_mapping.get(&id) {
|
|
Ok(*ty)
|
|
} else {
|
|
let variable_mapping = &mut self.variable_mapping;
|
|
let unifier = &mut self.unifier;
|
|
Ok(self
|
|
.function_data
|
|
.resolver
|
|
.get_symbol_type(unifier, &self.top_level.definitions.read(), self.primitives, id)
|
|
.unwrap_or_else(|_| {
|
|
let ty = unifier.get_dummy_var().0;
|
|
variable_mapping.insert(id, ty);
|
|
ty
|
|
}))
|
|
}
|
|
}
|
|
|
|
fn infer_constant(&mut self, constant: &ast::Constant, loc: &Location) -> InferenceResult {
|
|
match constant {
|
|
ast::Constant::Bool(_) => Ok(self.primitives.bool),
|
|
ast::Constant::Int(val) => {
|
|
let int32: Result<i32, _> = (*val).try_into();
|
|
// int64 and unsigned integers are handled separately in functions
|
|
if int32.is_ok() {
|
|
Ok(self.primitives.int32)
|
|
} else {
|
|
report_error("Integer out of bound", *loc)
|
|
}
|
|
}
|
|
ast::Constant::Float(_) => Ok(self.primitives.float),
|
|
ast::Constant::Tuple(vals) => {
|
|
let ty: Result<Vec<_>, _> =
|
|
vals.iter().map(|x| self.infer_constant(x, loc)).collect();
|
|
Ok(self.unifier.add_ty(TypeEnum::TTuple { ty: ty? }))
|
|
}
|
|
ast::Constant::Str(_) => Ok(self.primitives.str),
|
|
ast::Constant::None => {
|
|
report_error("CPython `None` not supported (nac3 uses `none` instead)", *loc)
|
|
}
|
|
_ => report_error("not supported", *loc),
|
|
}
|
|
}
|
|
|
|
fn infer_list(&mut self, elts: &[ast::Expr<Option<Type>>]) -> InferenceResult {
|
|
let ty = self.unifier.get_dummy_var().0;
|
|
for t in elts.iter() {
|
|
self.unify(ty, t.custom.unwrap(), &t.location)?;
|
|
}
|
|
Ok(self.unifier.add_ty(TypeEnum::TList { ty }))
|
|
}
|
|
|
|
fn infer_tuple(&mut self, elts: &[ast::Expr<Option<Type>>]) -> InferenceResult {
|
|
let ty = elts.iter().map(|x| x.custom.unwrap()).collect();
|
|
Ok(self.unifier.add_ty(TypeEnum::TTuple { ty }))
|
|
}
|
|
|
|
fn infer_attribute(
|
|
&mut self,
|
|
value: &ast::Expr<Option<Type>>,
|
|
attr: StrRef,
|
|
ctx: &ExprContext,
|
|
) -> InferenceResult {
|
|
let ty = value.custom.unwrap();
|
|
if let TypeEnum::TObj { fields, .. } = &*self.unifier.get_ty(ty) {
|
|
// just a fast path
|
|
match (fields.get(&attr), ctx == &ExprContext::Store) {
|
|
(Some((ty, true)), _) => Ok(*ty),
|
|
(Some((ty, false)), false) => Ok(*ty),
|
|
(Some((_, false)), true) => {
|
|
report_error(&format!("Field `{}` is immutable", attr), value.location)
|
|
}
|
|
(None, _) => {
|
|
let t = self.unifier.stringify(ty);
|
|
report_error(
|
|
&format!("`{}::{}` field/method does not exist", t, attr),
|
|
value.location,
|
|
)
|
|
}
|
|
}
|
|
} else {
|
|
let attr_ty = self.unifier.get_dummy_var().0;
|
|
let fields = once((
|
|
attr.into(),
|
|
RecordField::new(attr_ty, ctx == &ExprContext::Store, Some(value.location)),
|
|
))
|
|
.collect();
|
|
let record = self.unifier.add_record(fields);
|
|
self.constrain(value.custom.unwrap(), record, &value.location)?;
|
|
Ok(attr_ty)
|
|
}
|
|
}
|
|
|
|
fn infer_bool_ops(&mut self, values: &[ast::Expr<Option<Type>>]) -> InferenceResult {
|
|
let b = self.primitives.bool;
|
|
for v in values {
|
|
self.constrain(v.custom.unwrap(), b, &v.location)?;
|
|
}
|
|
Ok(b)
|
|
}
|
|
|
|
fn infer_bin_ops(
|
|
&mut self,
|
|
location: Location,
|
|
left: &ast::Expr<Option<Type>>,
|
|
op: &ast::Operator,
|
|
right: &ast::Expr<Option<Type>>,
|
|
is_aug_assign: bool,
|
|
) -> InferenceResult {
|
|
let method = if let TypeEnum::TObj { fields, .. } =
|
|
self.unifier.get_ty_immutable(left.custom.unwrap()).as_ref()
|
|
{
|
|
let (binop_name, binop_assign_name) =
|
|
(binop_name(op).into(), binop_assign_name(op).into());
|
|
// if is aug_assign, try aug_assign operator first
|
|
if is_aug_assign && fields.contains_key(&binop_assign_name) {
|
|
binop_assign_name
|
|
} else {
|
|
binop_name
|
|
}
|
|
} else {
|
|
binop_name(op).into()
|
|
};
|
|
self.build_method_call(
|
|
location,
|
|
method,
|
|
left.custom.unwrap(),
|
|
vec![right.custom.unwrap()],
|
|
None,
|
|
)
|
|
}
|
|
|
|
fn infer_unary_ops(
|
|
&mut self,
|
|
op: &ast::Unaryop,
|
|
operand: &ast::Expr<Option<Type>>,
|
|
) -> InferenceResult {
|
|
let method = unaryop_name(op).into();
|
|
self.build_method_call(operand.location, method, operand.custom.unwrap(), vec![], None)
|
|
}
|
|
|
|
fn infer_compare(
|
|
&mut self,
|
|
left: &ast::Expr<Option<Type>>,
|
|
ops: &[ast::Cmpop],
|
|
comparators: &[ast::Expr<Option<Type>>],
|
|
) -> InferenceResult {
|
|
let boolean = self.primitives.bool;
|
|
for (a, b, c) in izip!(once(left).chain(comparators), comparators, ops) {
|
|
let method =
|
|
comparison_name(c).ok_or_else(|| "unsupported comparator".to_string())?.into();
|
|
self.build_method_call(
|
|
a.location,
|
|
method,
|
|
a.custom.unwrap(),
|
|
vec![b.custom.unwrap()],
|
|
Some(boolean),
|
|
)?;
|
|
}
|
|
Ok(boolean)
|
|
}
|
|
|
|
fn infer_subscript(
|
|
&mut self,
|
|
value: &ast::Expr<Option<Type>>,
|
|
slice: &ast::Expr<Option<Type>>,
|
|
ctx: &ExprContext,
|
|
) -> InferenceResult {
|
|
let ty = self.unifier.get_dummy_var().0;
|
|
match &slice.node {
|
|
ast::ExprKind::Slice { lower, upper, step } => {
|
|
for v in [lower.as_ref(), upper.as_ref(), step.as_ref()].iter().flatten() {
|
|
self.constrain(v.custom.unwrap(), self.primitives.int32, &v.location)?;
|
|
}
|
|
// xxx: Support TNDArray.
|
|
let list = self.unifier.add_ty(TypeEnum::TList { ty });
|
|
self.constrain(value.custom.unwrap(), list, &value.location)?;
|
|
Ok(list)
|
|
}
|
|
ast::ExprKind::Constant { value: ast::Constant::Int(val), .. } => {
|
|
// the index is a constant, so value can be a sequence.
|
|
let ind: Option<i32> = (*val).try_into().ok();
|
|
let ind = ind.ok_or_else(|| "Index must be int32".to_string())?;
|
|
let map = once((
|
|
ind.into(),
|
|
RecordField::new(ty, ctx == &ExprContext::Store, Some(value.location)),
|
|
))
|
|
.collect();
|
|
let seq = self.unifier.add_record(map);
|
|
self.constrain(value.custom.unwrap(), seq, &value.location)?;
|
|
Ok(ty)
|
|
}
|
|
_ => {
|
|
match &*self.unifier.get_ty(value.custom.unwrap()) {
|
|
TypeEnum::TTuple { .. } => return report_error(
|
|
"Tuple index must be a constant (KernelInvariant is also not supported)",
|
|
slice.location,
|
|
),
|
|
TypeEnum::TNDArray { ty: elem_ty, num_dims } => {
|
|
let num_idxs = if let TypeEnum::TTuple { ty: idx_tys } =
|
|
&*self.unifier.get_ty(slice.custom.unwrap())
|
|
{
|
|
for idx_ty in idx_tys.iter() {
|
|
self.constrain(*idx_ty, self.primitives.int32, &slice.location)?;
|
|
}
|
|
idx_tys.len()
|
|
} else {
|
|
// xxx: Could lead to suboptimal error message, as higher-dimensional indexing is not mentioned?!
|
|
self.constrain(
|
|
slice.custom.unwrap(),
|
|
self.primitives.int32,
|
|
&slice.location,
|
|
)?;
|
|
1
|
|
};
|
|
|
|
if *num_dims < num_idxs {
|
|
report_error(
|
|
&format!(
|
|
"ndarray has dimension {}, but {} indices supplied",
|
|
num_dims, num_idxs
|
|
),
|
|
slice.location,
|
|
)
|
|
} else if *num_dims == num_idxs {
|
|
Ok(*elem_ty)
|
|
} else {
|
|
Ok(self.unifier.add_ty(TypeEnum::TNDArray {
|
|
ty: *elem_ty,
|
|
num_dims: *num_dims - num_idxs,
|
|
}))
|
|
}
|
|
}
|
|
_ => {
|
|
// the index is not a constant, so value can only be a list
|
|
// xxx: Or an ndarray now, so remove the constraint?
|
|
self.constrain(
|
|
slice.custom.unwrap(),
|
|
self.primitives.int32,
|
|
&slice.location,
|
|
)?;
|
|
let list = self.unifier.add_ty(TypeEnum::TList { ty });
|
|
self.constrain(value.custom.unwrap(), list, &value.location)?;
|
|
Ok(ty)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn infer_if_expr(
|
|
&mut self,
|
|
test: &ast::Expr<Option<Type>>,
|
|
body: &ast::Expr<Option<Type>>,
|
|
orelse: &ast::Expr<Option<Type>>,
|
|
) -> InferenceResult {
|
|
self.constrain(test.custom.unwrap(), self.primitives.bool, &test.location)?;
|
|
self.constrain(body.custom.unwrap(), orelse.custom.unwrap(), &body.location)?;
|
|
Ok(body.custom.unwrap())
|
|
}
|
|
}
|