forked from M-Labs/nac3
escape analysis implementation
buggy for now
This commit is contained in:
parent
c93f79f94a
commit
1257a80ed1
7
Cargo.lock
generated
7
Cargo.lock
generated
@ -524,6 +524,7 @@ dependencies = [
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"parking_lot 0.11.2",
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"rayon",
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"regex",
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"slab",
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"test-case",
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]
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@ -1003,6 +1004,12 @@ version = "0.3.10"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7bd3e3206899af3f8b12af284fafc038cc1dc2b41d1b89dd17297221c5d225de"
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[[package]]
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name = "slab"
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version = "0.4.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "eb703cfe953bccee95685111adeedb76fabe4e97549a58d16f03ea7b9367bb32"
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[[package]]
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name = "smallvec"
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version = "1.8.0"
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@ -9,6 +9,7 @@ itertools = "0.10.1"
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crossbeam = "0.8.1"
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parking_lot = "0.11.1"
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rayon = "1.5.1"
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slab = "0.4.6"
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nac3parser = { path = "../nac3parser" }
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[dependencies.inkwell]
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@ -4,7 +4,7 @@ use std::rc::Rc;
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use crate::{
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codegen::{expr::get_subst_key, stmt::exn_constructor},
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symbol_resolver::SymbolValue,
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typecheck::type_inferencer::{FunctionData, Inferencer},
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typecheck::{type_inferencer::{FunctionData, Inferencer}, escape_analysis::EscapeAnalyzer},
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};
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use super::*;
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@ -1792,6 +1792,7 @@ impl TopLevelComposer {
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result
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};
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let mut calls: HashMap<CodeLocation, CallId> = HashMap::new();
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let mut args = vec![];
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let mut inferencer = Inferencer {
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top_level: ctx.as_ref(),
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defined_identifiers: identifiers.clone(),
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@ -1812,6 +1813,7 @@ impl TopLevelComposer {
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result.insert("self".into(), self_ty);
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}
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result.extend(inst_args.iter().map(|x| (x.name, x.ty)));
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args.extend(result.iter().map(|(&a, &b)| (a, b)));
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result
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},
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primitives: primitives_ty,
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@ -1917,6 +1919,18 @@ impl TopLevelComposer {
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));
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}
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if simple_name.to_string() != "__init__" {
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EscapeAnalyzer::check_function_lifetime(
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unifier,
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&primitives_ty,
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resolver.as_ref().unwrap().clone(),
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ctx.as_ref(),
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&args,
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&fun_body,
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ast.as_ref().unwrap().location,
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).map_err(|e| format!("Escape analysis error: {}\n in function {}", e, name))?;
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}
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instance_to_stmt.insert(
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get_subst_key(unifier, self_type, &subst, Some(&vars.keys().cloned().collect())),
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FunInstance {
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@ -1,276 +1,496 @@
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use std::cell::RefCell;
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use slab::Slab;
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use std::borrow::Cow;
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use std::collections::{HashMap, HashSet};
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use std::rc::Rc;
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use crate::typecheck::unification_table::{UnificationKey, UnificationTable};
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use nac3parser::ast::{Location, StrRef};
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use itertools::Itertools;
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use nac3parser::ast::StrRef;
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// change this to enum, only local needs unification key
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pub type Lifetime = UnificationKey;
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#[derive(Copy, Debug, Clone, PartialEq, Eq, Hash)]
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum LifetimeKind {
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// can be assigned to fields of anything
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// can be returned
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// lifetime of static values
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Global,
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// can only be assigned to fields of objects with local lifetime
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// can be returned
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// lifetime of parameters
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Static,
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NonLocal,
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// can only be assigned to fields of objects with local lifetime
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// cannot be returned
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// lifetime of constructor return values
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Local,
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// can only be assigned to fields of objects with local lifetime
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// cannot be returned
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// lifetime of function return values
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Unknown,
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PreciseLocal,
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ImpreciseLocal,
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}
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impl std::ops::BitAnd for LifetimeKind {
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type Output = Self;
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fn bitand(self, other: Self) -> Self {
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fn bitand(self, rhs: Self) -> Self::Output {
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use LifetimeKind::*;
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match (self, other) {
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match (self, rhs) {
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(x, y) if x == y => x,
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(Global, NonLocal) | (NonLocal, Global) => NonLocal,
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(PreciseLocal, ImpreciseLocal) | (ImpreciseLocal, PreciseLocal) => ImpreciseLocal,
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(Static, NonLocal) | (NonLocal, Static) => NonLocal,
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_ => Unknown,
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}
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}
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}
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impl std::cmp::PartialOrd for LifetimeKind {
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fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
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use LifetimeKind::*;
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match (*self, *other) {
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(x, y) if x == y => Some(std::cmp::Ordering::Equal),
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(Local, _) | (_, Global) => Some(std::cmp::Ordering::Less),
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(_, Local) | (Global, _) => Some(std::cmp::Ordering::Greater),
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_ => None,
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub struct LifetimeId(usize);
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub struct BasicBlockId(usize);
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#[derive(Debug, Clone)]
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pub enum LifetimeIR {
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VarAssign { var: StrRef, lifetime: LifetimeId },
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VarAccess { var: StrRef },
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FieldAssign { obj: LifetimeId, field: StrRef, new: LifetimeId },
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FieldAccess { obj: LifetimeId, field: StrRef },
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CreateLifetime { kind: LifetimeKind },
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PassedToFunc { param_lifetimes: Vec<LifetimeId> },
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UnifyLifetimes { lifetimes: Vec<LifetimeId> },
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Branch { targets: Vec<BasicBlockId> },
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Return { val: Option<LifetimeId> },
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}
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pub struct LifetimeIRBuilder {
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irs: Vec<Option<(LifetimeIR, Location)>>,
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basic_blocks: Vec<Vec<usize>>,
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current_block: BasicBlockId,
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}
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impl LifetimeIRBuilder {
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pub fn new() -> Self {
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LifetimeIRBuilder {
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irs: vec![None],
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basic_blocks: vec![vec![]],
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current_block: BasicBlockId(0),
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}
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}
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}
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pub struct BlockLifetimeContext {
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mapping: Vec<(Option<Lifetime>, Lifetime)>,
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}
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impl BlockLifetimeContext {
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pub fn new() -> Self {
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BlockLifetimeContext { mapping: Vec::new() }
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pub fn print_ir(&self) -> String {
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let mut lines = vec![];
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for (i, bb) in self.basic_blocks.iter().enumerate() {
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if bb.is_empty() {
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continue;
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}
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lines.push(format!("{}:", i));
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for ir in bb.iter() {
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if let Some((inst, loc)) = &self.irs[*ir] {
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lines.push(format!(" {}: {:?} ({})", *ir, inst, loc));
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}
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}
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}
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lines.join("\n")
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}
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pub fn add_fresh(&mut self, lifetime: Lifetime) {
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self.mapping.push((None, lifetime));
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pub fn append_ir(&mut self, inst: LifetimeIR, loc: Location) -> LifetimeId {
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let id = self.irs.len();
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self.irs.push(Some((inst, loc)));
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self.basic_blocks[self.current_block.0].push(id);
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LifetimeId(id)
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}
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pub fn append_block(&mut self) -> BasicBlockId {
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let id = self.basic_blocks.len();
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self.basic_blocks.push(vec![]);
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BasicBlockId(id)
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}
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pub fn get_current_block(&self) -> BasicBlockId {
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self.current_block
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}
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pub fn position_at_end(&mut self, id: BasicBlockId) {
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self.current_block = id;
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}
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pub fn is_terminated(&self, id: BasicBlockId) -> bool {
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let bb = &self.basic_blocks[id.0];
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if bb.is_empty() {
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false
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} else {
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matches!(
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self.irs[*bb.last().unwrap()],
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Some((LifetimeIR::Return { .. }, _)) | Some((LifetimeIR::Branch { .. }, _))
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)
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}
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}
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pub fn remove_empty_bb(&mut self) {
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let mut destination_mapping = HashMap::new();
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let basic_blocks = &mut self.basic_blocks;
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let irs = &mut self.irs;
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for (i, bb) in basic_blocks.iter_mut().enumerate() {
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bb.retain(|&id| irs[id].is_some());
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if bb.len() == 1 {
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let id = bb.pop().unwrap();
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let ir = irs[id].take().unwrap();
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match ir.0 {
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LifetimeIR::Branch { targets } => {
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destination_mapping.insert(i, targets);
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}
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_ => unreachable!(),
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}
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}
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}
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let mut buffer = HashSet::new();
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for bb in basic_blocks.iter_mut() {
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if bb.is_empty() {
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continue;
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}
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if let LifetimeIR::Branch { targets } =
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&mut irs[*bb.last().unwrap()].as_mut().unwrap().0
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{
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buffer.clear();
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let mut updated = false;
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for target in targets.iter() {
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if let Some(dest) = destination_mapping.get(&target.0) {
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buffer.extend(dest.iter().cloned());
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updated = true;
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} else {
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buffer.insert(*target);
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}
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}
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if updated {
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targets.clear();
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targets.extend(buffer.iter().cloned());
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}
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}
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}
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}
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pub fn analyze(&self) -> Result<(), String> {
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let mut analyzers = HashMap::new();
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analyzers.insert(0, LifetimeAnalyzer::new());
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let mut worklist = vec![0];
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let mut counter = 0;
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while let Some(bb) = worklist.pop() {
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counter += 1;
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if counter > 100 {
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return Err(format!("escape analyzer stuck in infinite loop?"));
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}
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let mut analyzer = analyzers.get(&bb).unwrap().clone();
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let block = &self.basic_blocks[bb];
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let ir_iter = block.iter().filter_map(|&id| {
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self.irs[id].as_ref().map(|(ir, loc)| (LifetimeId(id), ir, *loc))
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});
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if let Some(branch) = analyzer.analyze_basic_block(ir_iter)? {
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for &target in branch.iter() {
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if let Some(successor) = analyzers.get_mut(&target.0) {
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if successor.merge(&analyzer) {
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// changed
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worklist.push(target.0);
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}
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} else {
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analyzers.insert(target.0, analyzer.clone());
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worklist.push(target.0);
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}
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}
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}
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}
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Ok(())
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}
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}
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struct LifetimeEntry {
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#[derive(Debug, Clone, PartialEq, Eq)]
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struct LifetimeStore {
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kind: LifetimeKind,
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fields: RefCell<HashMap<StrRef, Lifetime>>,
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fields: HashMap<StrRef, LifetimeId>,
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lifetimes: HashSet<LifetimeId>,
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}
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pub struct LifetimeTable {
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table: UnificationTable<Rc<LifetimeEntry>>,
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cache: HashSet<(Lifetime, Lifetime)>,
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#[derive(Debug, Clone)]
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pub struct LifetimeAnalyzer<'a> {
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lifetime_to_id: HashMap<LifetimeId, usize>,
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lifetime_stores: Slab<Cow<'a, LifetimeStore>>,
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variable_assignment: HashMap<StrRef, LifetimeId>,
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}
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impl LifetimeTable {
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impl<'a> LifetimeAnalyzer<'a> {
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pub fn new() -> Self {
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let mut zelf = Self { table: UnificationTable::new(), cache: Default::default() };
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zelf.table.new_key(Rc::new(LifetimeEntry {
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kind: LifetimeKind::Unknown,
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fields: Default::default(),
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}));
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let mut zelf = LifetimeAnalyzer {
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lifetime_to_id: HashMap::new(),
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lifetime_stores: Default::default(),
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variable_assignment: HashMap::new(),
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};
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zelf.add_lifetime(LifetimeId(0), LifetimeKind::Unknown);
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zelf
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}
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pub fn add_lifetime(&mut self, kind: LifetimeKind) -> Lifetime {
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self.table.new_key(Rc::new(LifetimeEntry { kind, fields: Default::default() }))
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}
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pub fn merge(&mut self, other: &LifetimeAnalyzer) -> bool {
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let mut to_be_merged = other.lifetime_to_id.keys().cloned().collect::<Vec<_>>();
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let mut updated = false;
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pub fn unify(&mut self, a: Lifetime, b: Lifetime, ctx: &mut BlockLifetimeContext) {
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self.cache.clear();
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self.unify_impl(a, b, ctx);
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}
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fn get_scoped<const N: usize>(
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&mut self,
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mut lifetimes: [Lifetime; N],
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ctx: &mut BlockLifetimeContext,
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) -> [Lifetime; N] {
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for l in lifetimes.iter_mut() {
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let mut result = None;
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for (k, v) in ctx.mapping.iter() {
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if self.table.unioned(*v, *l) || k.map_or(false, |k| self.table.unioned(k, *l)) {
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// already fresh
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result = Some(*v);
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break;
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let mut lifetime_merge_list = vec![];
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for (&var_name, &lifetime) in other.variable_assignment.iter() {
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if let Some(&our_lifetime) = self.variable_assignment.get(&var_name) {
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if our_lifetime != lifetime {
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lifetime_merge_list.push((our_lifetime, lifetime));
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}
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}
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if let Some(result) = result {
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*l = result;
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} else {
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let lifetime = self.table.probe_value(*l).clone();
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*l = if lifetime.kind == LifetimeKind::Unknown {
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UnificationKey(0)
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} else {
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let k = self.table.new_key(lifetime);
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ctx.mapping.push((Some(*l), k));
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k
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}
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self.variable_assignment.insert(var_name, lifetime);
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updated = true;
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}
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}
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lifetimes
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}
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fn unify_impl(&mut self, a: Lifetime, b: Lifetime, ctx: &mut BlockLifetimeContext) {
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use LifetimeKind::*;
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let [a, b] = self.get_scoped([a, b], ctx);
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let a = self.table.get_representative(a);
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let b = self.table.get_representative(b);
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if a == b || self.cache.contains(&(a, b)) || self.cache.contains(&(b, a)) {
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return;
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}
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self.cache.insert((a, b));
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let v_a = self.table.probe_value(a).clone();
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let v_b = self.table.probe_value(b).clone();
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let result_kind = v_a.kind & v_b.kind;
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let fields = if result_kind == Local {
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// we only need to track fields lifetime for objects with local lifetime
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let fields = v_a.fields.clone();
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{
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let mut fields_ref = fields.borrow_mut();
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for (k, v) in v_b.fields.borrow().iter() {
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if let Some(old) = fields_ref.insert(k.clone(), *v) {
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self.unify_impl(old, *v, ctx);
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while let Some(lifetime) = to_be_merged.pop() {
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let other_store_id = *other.lifetime_to_id.get(&lifetime).unwrap();
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if let Some(&self_store_id) = self.lifetime_to_id.get(&lifetime) {
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let self_store = self.lifetime_stores.get_mut(self_store_id).unwrap();
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let other_store = other.lifetime_stores.get(other_store_id).unwrap();
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let self_store = self_store.to_mut();
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// merge them
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for (&field, &other_lifetime) in other_store.fields.iter() {
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if let Some(&self_lifetime) = self_store.fields.get(&field) {
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if self_lifetime != other_lifetime {
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lifetime_merge_list.push((self_lifetime, other_lifetime));
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}
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} else {
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self_store.fields.insert(field, other_lifetime);
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updated = true;
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}
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}
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let zelf_lifetimes = &mut self_store.lifetimes;
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for &other_lifetime in other_store.lifetimes.iter() {
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if zelf_lifetimes.insert(other_lifetime) {
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lifetime_merge_list.push((lifetime, other_lifetime));
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}
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}
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let result_kind = self_store.kind & other_store.kind;
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if self_store.kind != result_kind {
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self_store.kind = result_kind;
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}
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} else {
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let store = other.lifetime_stores.get(other_store_id).unwrap().as_ref().clone();
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let store = self.lifetime_stores.insert(Cow::Owned(store));
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self.lifetime_to_id.insert(lifetime, store);
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updated = true;
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}
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}
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for (a, b) in lifetime_merge_list.into_iter() {
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self.unify(a, b);
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}
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updated
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}
|
||||
|
||||
pub fn add_lifetime(&mut self, lifetime: LifetimeId, kind: LifetimeKind) {
|
||||
let id = self.lifetime_stores.insert(Cow::Owned(LifetimeStore {
|
||||
kind,
|
||||
fields: HashMap::new(),
|
||||
lifetimes: [lifetime].iter().cloned().collect(),
|
||||
}));
|
||||
let old_store_id = self.lifetime_to_id.insert(lifetime, id);
|
||||
if let Some(old_store_id) = old_store_id {
|
||||
let old_lifetime_store = self.lifetime_stores.get_mut(old_store_id).unwrap().to_mut();
|
||||
old_lifetime_store.lifetimes.remove(&lifetime);
|
||||
if old_lifetime_store.lifetimes.is_empty() {
|
||||
self.lifetime_stores.remove(old_store_id);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn set_lifetime(&mut self, lifetime: LifetimeId, to: LifetimeId) {
|
||||
let id = *self.lifetime_to_id.get(&to).unwrap();
|
||||
let store = self.lifetime_stores.get_mut(id).unwrap();
|
||||
store.to_mut().lifetimes.insert(lifetime);
|
||||
let old_store_id = self.lifetime_to_id.insert(lifetime, id);
|
||||
if let Some(old_store_id) = old_store_id {
|
||||
let old_lifetime_store = self.lifetime_stores.get_mut(old_store_id).unwrap().to_mut();
|
||||
old_lifetime_store.lifetimes.remove(&lifetime);
|
||||
if old_lifetime_store.lifetimes.is_empty() {
|
||||
self.lifetime_stores.remove(old_store_id);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn unify(&mut self, lhs: LifetimeId, rhs: LifetimeId) {
|
||||
use LifetimeKind::{ImpreciseLocal, PreciseLocal};
|
||||
let lhs_id = *self.lifetime_to_id.get(&lhs).unwrap();
|
||||
let rhs_id = *self.lifetime_to_id.get(&rhs).unwrap();
|
||||
if lhs_id == rhs_id {
|
||||
return;
|
||||
}
|
||||
let lhs_store = self.lifetime_stores.get(lhs_id).unwrap();
|
||||
let rhs_store = self.lifetime_stores.get(rhs_id).unwrap();
|
||||
let all_lifetimes: HashSet<_> =
|
||||
lhs_store.lifetimes.union(&rhs_store.lifetimes).cloned().collect();
|
||||
let result_kind = lhs_store.kind & rhs_store.kind;
|
||||
let fields = if matches!(result_kind, PreciseLocal | ImpreciseLocal) {
|
||||
let mut need_union = vec![];
|
||||
let mut fields = lhs_store.fields.clone();
|
||||
for (k, v) in rhs_store.fields.iter() {
|
||||
if let Some(old) = fields.insert(*k, *v) {
|
||||
need_union.push((old, *v));
|
||||
}
|
||||
}
|
||||
drop(lhs_store);
|
||||
drop(rhs_store);
|
||||
for (lhs, rhs) in need_union {
|
||||
self.unify(lhs, rhs);
|
||||
}
|
||||
fields
|
||||
} else {
|
||||
Default::default()
|
||||
};
|
||||
|
||||
self.table.unify(a, b);
|
||||
self.table.set_value(a, Rc::new(LifetimeEntry { kind: result_kind, fields }));
|
||||
// unify them, slow
|
||||
for lifetime in all_lifetimes.iter() {
|
||||
self.lifetime_to_id.insert(*lifetime, lhs_id);
|
||||
}
|
||||
*self.lifetime_stores.get_mut(lhs_id).unwrap() =
|
||||
Cow::Owned(LifetimeStore { kind: result_kind, fields, lifetimes: all_lifetimes });
|
||||
self.lifetime_stores.remove(rhs_id);
|
||||
}
|
||||
|
||||
pub fn get_field_lifetime(
|
||||
&mut self,
|
||||
lifetime: Lifetime,
|
||||
field: StrRef,
|
||||
ctx: &mut BlockLifetimeContext,
|
||||
) -> Lifetime {
|
||||
fn get_field_lifetime(&self, obj: LifetimeId, field: StrRef) -> LifetimeId {
|
||||
use LifetimeKind::*;
|
||||
let [lifetime] = self.get_scoped([lifetime], ctx);
|
||||
if let LifetimeEntry { kind: Local, fields } = &*self.table.probe_value(lifetime).clone() {
|
||||
if let Some(lifetime) = fields.borrow().get(&field) {
|
||||
*lifetime
|
||||
} else {
|
||||
// unknown lifetime
|
||||
// we can reuse this lifetime because it will never be unified to something else
|
||||
UnificationKey(0)
|
||||
}
|
||||
let id = *self.lifetime_to_id.get(&obj).unwrap();
|
||||
let store = &self.lifetime_stores.get(id).unwrap();
|
||||
if let Some(lifetime) = store.fields.get(&field) {
|
||||
*lifetime
|
||||
} else if matches!(store.kind, PreciseLocal | ImpreciseLocal) {
|
||||
LifetimeId(0)
|
||||
} else {
|
||||
lifetime
|
||||
obj
|
||||
}
|
||||
}
|
||||
|
||||
pub fn set_field_lifetime(
|
||||
fn set_field_lifetime(
|
||||
&mut self,
|
||||
obj: Lifetime,
|
||||
obj: LifetimeId,
|
||||
field: StrRef,
|
||||
lifetime: Lifetime,
|
||||
is_strong_update: bool,
|
||||
ctx: &mut BlockLifetimeContext,
|
||||
field_lifetime: LifetimeId,
|
||||
) -> Result<(), String> {
|
||||
let [obj, lifetime] = self.get_scoped([obj, lifetime], ctx);
|
||||
let obj_lifetime = self.table.probe_value(obj).clone();
|
||||
let field_lifetime = self.table.probe_value(lifetime).clone();
|
||||
if !(obj_lifetime.kind <= field_lifetime.kind) {
|
||||
return Err("lifetime error".to_string());
|
||||
use LifetimeKind::*;
|
||||
let obj_id = *self.lifetime_to_id.get(&obj).unwrap();
|
||||
let field_id = *self.lifetime_to_id.get(&field_lifetime).unwrap();
|
||||
let field_lifetime_kind = self.lifetime_stores.get(field_id).unwrap().kind;
|
||||
let obj_store = self.lifetime_stores.get_mut(obj_id).unwrap();
|
||||
if !matches!(
|
||||
(obj_store.kind, field_lifetime_kind),
|
||||
(PreciseLocal, _) | (ImpreciseLocal, _) | (_, Static)
|
||||
) {
|
||||
return Err("field lifetime error".into());
|
||||
}
|
||||
let mut fields = obj_lifetime.fields.borrow_mut();
|
||||
if is_strong_update {
|
||||
fields.insert(field, lifetime);
|
||||
} else {
|
||||
if let Some(old) = fields.insert(field, lifetime) {
|
||||
self.unify(old, lifetime, ctx);
|
||||
match obj_store.kind {
|
||||
// $elem means list elements
|
||||
PreciseLocal if field != "$elem".into() => {
|
||||
// strong update
|
||||
obj_store.to_mut().fields.insert(field, field_lifetime);
|
||||
}
|
||||
PreciseLocal | ImpreciseLocal => {
|
||||
// weak update
|
||||
let old_lifetime = obj_store
|
||||
.to_mut()
|
||||
.fields
|
||||
.get(&field)
|
||||
.copied();
|
||||
if let Some(old_lifetime) = old_lifetime {
|
||||
self.unify(old_lifetime, field_lifetime);
|
||||
} else {
|
||||
obj_store.to_mut().fields.insert(field, field_lifetime);
|
||||
}
|
||||
}
|
||||
_ => (),
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn get_lifetime_kind(
|
||||
&mut self,
|
||||
lifetime: Lifetime,
|
||||
ctx: &mut BlockLifetimeContext,
|
||||
) -> LifetimeKind {
|
||||
let [lifetime] = self.get_scoped([lifetime], ctx);
|
||||
self.table.probe_value(lifetime).kind
|
||||
fn get_lifetime_kind(&self, lifetime: LifetimeId) -> LifetimeKind {
|
||||
self.lifetime_stores.get(*self.lifetime_to_id.get(&lifetime).unwrap()).unwrap().kind
|
||||
}
|
||||
|
||||
pub fn set_function_params(&mut self, lifetime: Lifetime, ctx: &mut BlockLifetimeContext) {
|
||||
fn pass_function_params(&mut self, lifetimes: &[LifetimeId]) {
|
||||
use LifetimeKind::*;
|
||||
// unify each field with global
|
||||
let [lifetime] = self.get_scoped([lifetime], ctx);
|
||||
let lifetime = self.table.probe_value(lifetime).clone();
|
||||
let mut worklist = lifetime.fields.borrow().values().copied().collect_vec();
|
||||
while let Some(item) = worklist.pop() {
|
||||
let [item] = self.get_scoped([item], ctx);
|
||||
let lifetime = self.table.probe_value(item).clone();
|
||||
if lifetime.kind == Unknown || lifetime.kind == Global {
|
||||
continue;
|
||||
}
|
||||
let fields = lifetime.fields.borrow().clone();
|
||||
for (_, v) in fields.iter() {
|
||||
worklist.push(*v);
|
||||
}
|
||||
self.table.set_value(
|
||||
item,
|
||||
Rc::new(LifetimeEntry {
|
||||
kind: lifetime.kind & Global,
|
||||
fields: RefCell::new(fields),
|
||||
}),
|
||||
);
|
||||
}
|
||||
}
|
||||
let mut visited = HashSet::new();
|
||||
let mut worklist = vec![];
|
||||
|
||||
pub fn get_unknown_lifetime(&self) -> Lifetime {
|
||||
UnificationKey(0)
|
||||
}
|
||||
|
||||
pub fn equiv(&mut self, a: Lifetime, b: Lifetime, ctx: &mut BlockLifetimeContext) -> bool {
|
||||
use LifetimeKind::Local;
|
||||
let [a, b] = self.get_scoped([a, b], ctx);
|
||||
if self.table.unioned(a, b) {
|
||||
return true;
|
||||
}
|
||||
let lifetime_a = self.table.probe_value(a).clone();
|
||||
let lifetime_b = self.table.probe_value(b).clone();
|
||||
if lifetime_a.kind == Local && lifetime_b.kind == Local {
|
||||
let fields_a = lifetime_a.fields.borrow();
|
||||
let fields_b = lifetime_b.fields.borrow();
|
||||
for (k, v) in fields_a.iter() {
|
||||
if fields_b.get(k).map(|v1| self.equiv(*v, *v1, ctx)) != Some(true) {
|
||||
return false;
|
||||
fn add_fields_to_worklist(
|
||||
visited: &mut HashSet<LifetimeId>,
|
||||
worklist: &mut Vec<(LifetimeId, bool)>,
|
||||
fields: &HashMap<StrRef, LifetimeId>,
|
||||
) {
|
||||
for (&name, &field) in fields.iter() {
|
||||
if visited.insert(field) {
|
||||
// not visited previously
|
||||
let name = name.to_string();
|
||||
let mutable = !(name.starts_with("$elem") && name.len() != "$elem".len());
|
||||
worklist.push((field, mutable));
|
||||
}
|
||||
}
|
||||
// they are just equivalent
|
||||
// this can avoid infinite recursion
|
||||
self.table.unify(a, b);
|
||||
true
|
||||
} else {
|
||||
lifetime_a.kind == lifetime_b.kind
|
||||
}
|
||||
|
||||
for lifetime in lifetimes.iter() {
|
||||
let lifetime =
|
||||
self.lifetime_stores.get_mut(*self.lifetime_to_id.get(lifetime).unwrap()).unwrap();
|
||||
add_fields_to_worklist(&mut visited, &mut worklist, &lifetime.fields);
|
||||
}
|
||||
while let Some((item, mutable)) = worklist.pop() {
|
||||
let lifetime =
|
||||
self.lifetime_stores.get_mut(*self.lifetime_to_id.get(&item).unwrap()).unwrap();
|
||||
if matches!(lifetime.kind, Unknown | Static) {
|
||||
continue;
|
||||
}
|
||||
add_fields_to_worklist(&mut visited, &mut worklist, &lifetime.fields);
|
||||
if mutable {
|
||||
// we may assign values with static lifetime to function params
|
||||
lifetime.to_mut().kind = lifetime.kind & Static;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn analyze_basic_block<'b, I: Iterator<Item = (LifetimeId, &'b LifetimeIR, Location)>>(
|
||||
&mut self,
|
||||
instructions: I,
|
||||
) -> Result<Option<&'b [BasicBlockId]>, String> {
|
||||
use LifetimeIR::*;
|
||||
for (id, inst, loc) in instructions {
|
||||
match inst {
|
||||
VarAssign { var, lifetime } => {
|
||||
self.variable_assignment.insert(*var, *lifetime);
|
||||
}
|
||||
VarAccess { var } => {
|
||||
let lifetime = self.variable_assignment.get(var).cloned();
|
||||
if let Some(lifetime) = lifetime {
|
||||
self.set_lifetime(id, lifetime);
|
||||
} else {
|
||||
// should be static lifetime
|
||||
self.add_lifetime(id, LifetimeKind::Static)
|
||||
}
|
||||
}
|
||||
FieldAssign { obj, field, new } => {
|
||||
self.set_field_lifetime(*obj, *field, *new)
|
||||
.map_err(|e| format!("{} in {}", e, loc))?;
|
||||
}
|
||||
FieldAccess { obj, field } => {
|
||||
let lifetime = self.get_field_lifetime(*obj, *field);
|
||||
self.set_lifetime(id, lifetime);
|
||||
}
|
||||
CreateLifetime { kind } => {
|
||||
if *kind == LifetimeKind::Unknown {
|
||||
self.set_lifetime(id, LifetimeId(0));
|
||||
} else {
|
||||
self.add_lifetime(id, *kind);
|
||||
}
|
||||
}
|
||||
PassedToFunc { param_lifetimes } => {
|
||||
self.pass_function_params(param_lifetimes);
|
||||
}
|
||||
UnifyLifetimes { lifetimes } => {
|
||||
assert!(!lifetimes.is_empty());
|
||||
let lhs = lifetimes[0];
|
||||
for rhs in lifetimes[1..].iter() {
|
||||
self.unify(lhs, *rhs);
|
||||
}
|
||||
self.set_lifetime(id, lhs);
|
||||
}
|
||||
Return { val } => {
|
||||
if let Some(val) = val {
|
||||
let kind = self.get_lifetime_kind(*val);
|
||||
if !matches!(kind, LifetimeKind::Static | LifetimeKind::NonLocal) {
|
||||
return Err(format!("return value lifetime error in {}", loc));
|
||||
}
|
||||
}
|
||||
return Ok(None);
|
||||
}
|
||||
Branch { targets } => return Ok(Some(targets))
|
||||
}
|
||||
}
|
||||
Ok(None)
|
||||
}
|
||||
}
|
||||
|
||||
@ -1,45 +1,46 @@
|
||||
use std::{collections::HashMap, sync::Arc};
|
||||
use std::sync::Arc;
|
||||
|
||||
use nac3parser::ast::{Constant, Expr, ExprKind, Stmt, StmtKind, StrRef};
|
||||
use itertools::chain;
|
||||
use nac3parser::ast::{Comprehension, Constant, Expr, ExprKind, Location, Stmt, StmtKind, StrRef};
|
||||
|
||||
use lifetime::{BasicBlockId, LifetimeIR, LifetimeIRBuilder, LifetimeId, LifetimeKind};
|
||||
|
||||
use crate::{
|
||||
symbol_resolver::SymbolResolver,
|
||||
toplevel::{TopLevelContext, TopLevelDef},
|
||||
};
|
||||
|
||||
use self::lifetime::{BlockLifetimeContext, Lifetime, LifetimeTable};
|
||||
|
||||
use super::{
|
||||
type_inferencer::PrimitiveStore,
|
||||
typedef::{Type, TypeEnum, Unifier},
|
||||
};
|
||||
|
||||
pub mod lifetime;
|
||||
|
||||
#[cfg(test)]
|
||||
mod test;
|
||||
|
||||
struct LifetimeContext<'a> {
|
||||
variable_mapping: HashMap<StrRef, (Lifetime, bool)>,
|
||||
scope_ctx: BlockLifetimeContext,
|
||||
lifetime_table: LifetimeTable,
|
||||
primitive_store: &'a PrimitiveStore,
|
||||
mod lifetime;
|
||||
|
||||
pub struct EscapeAnalyzer<'a> {
|
||||
builder: LifetimeIRBuilder,
|
||||
loop_head: Option<BasicBlockId>,
|
||||
loop_tail: Option<BasicBlockId>,
|
||||
unifier: &'a mut Unifier,
|
||||
primitive_store: &'a PrimitiveStore,
|
||||
resolver: Arc<dyn SymbolResolver + Send + Sync>,
|
||||
top_level: &'a TopLevelContext,
|
||||
}
|
||||
|
||||
impl<'a> LifetimeContext<'a> {
|
||||
impl<'a> EscapeAnalyzer<'a> {
|
||||
pub fn new(
|
||||
unifier: &'a mut Unifier,
|
||||
primitive_store: &'a PrimitiveStore,
|
||||
resolver: Arc<dyn SymbolResolver + Send + Sync>,
|
||||
top_level: &'a TopLevelContext,
|
||||
) -> LifetimeContext<'a> {
|
||||
LifetimeContext {
|
||||
variable_mapping: HashMap::new(),
|
||||
scope_ctx: BlockLifetimeContext::new(),
|
||||
lifetime_table: LifetimeTable::new(),
|
||||
) -> Self {
|
||||
Self {
|
||||
builder: LifetimeIRBuilder::new(),
|
||||
loop_head: None,
|
||||
loop_tail: None,
|
||||
primitive_store,
|
||||
unifier,
|
||||
resolver,
|
||||
@ -47,272 +48,305 @@ impl<'a> LifetimeContext<'a> {
|
||||
}
|
||||
}
|
||||
|
||||
fn get_expr_lifetime(
|
||||
&mut self,
|
||||
expr: &Expr<Option<Type>>,
|
||||
) -> Result<Option<(Lifetime, bool)>, String> {
|
||||
let ty = expr.custom.unwrap();
|
||||
let is_primitive = self.unifier.unioned(ty, self.primitive_store.int32)
|
||||
pub fn check_function_lifetime(
|
||||
unifier: &'a mut Unifier,
|
||||
primitive_store: &'a PrimitiveStore,
|
||||
resolver: Arc<dyn SymbolResolver + Send + Sync>,
|
||||
top_level: &'a TopLevelContext,
|
||||
args: &[(StrRef, Type)],
|
||||
body: &[Stmt<Option<Type>>],
|
||||
loc: Location,
|
||||
) -> Result<(), String> {
|
||||
use LifetimeIR::{CreateLifetime, VarAssign};
|
||||
let mut zelf = Self::new(unifier, primitive_store, resolver, top_level);
|
||||
let nonlocal_lifetime =
|
||||
zelf.builder.append_ir(CreateLifetime { kind: LifetimeKind::NonLocal }, loc);
|
||||
for (name, ty) in args.iter().copied() {
|
||||
if zelf.need_alloca(ty) {
|
||||
zelf.builder.append_ir(VarAssign { var: name, lifetime: nonlocal_lifetime }, loc);
|
||||
}
|
||||
}
|
||||
zelf.handle_statements(body)?;
|
||||
zelf.builder.analyze()
|
||||
}
|
||||
|
||||
fn need_alloca(&mut self, ty: Type) -> bool {
|
||||
!(self.unifier.unioned(ty, self.primitive_store.int32)
|
||||
|| self.unifier.unioned(ty, self.primitive_store.int64)
|
||||
|| self.unifier.unioned(ty, self.primitive_store.uint32)
|
||||
|| self.unifier.unioned(ty, self.primitive_store.uint64)
|
||||
|| self.unifier.unioned(ty, self.primitive_store.float)
|
||||
|| self.unifier.unioned(ty, self.primitive_store.bool)
|
||||
|| self.unifier.unioned(ty, self.primitive_store.none)
|
||||
|| self.unifier.unioned(ty, self.primitive_store.range);
|
||||
|| self.unifier.unioned(ty, self.primitive_store.range))
|
||||
}
|
||||
|
||||
fn is_terminated(&self) -> bool {
|
||||
self.builder.is_terminated(self.builder.get_current_block())
|
||||
}
|
||||
|
||||
fn handle_unknown_function_call<P: std::borrow::Borrow<Expr<Option<Type>>>>(
|
||||
&mut self,
|
||||
params: &[P],
|
||||
ret_need_alloca: bool,
|
||||
loc: Location,
|
||||
) -> Result<Option<LifetimeId>, String> {
|
||||
let param_lifetimes = params
|
||||
.iter()
|
||||
.filter_map(|p| self.handle_expr(p.borrow()).transpose())
|
||||
.collect::<Result<Vec<_>, _>>()?;
|
||||
self.builder.append_ir(LifetimeIR::PassedToFunc { param_lifetimes }, loc);
|
||||
if ret_need_alloca {
|
||||
Ok(Some(
|
||||
self.builder
|
||||
.append_ir(LifetimeIR::CreateLifetime { kind: LifetimeKind::Unknown }, loc),
|
||||
))
|
||||
} else {
|
||||
Ok(None)
|
||||
}
|
||||
}
|
||||
|
||||
fn handle_expr(&mut self, expr: &Expr<Option<Type>>) -> Result<Option<LifetimeId>, String> {
|
||||
use LifetimeIR::*;
|
||||
use LifetimeKind::*;
|
||||
let need_alloca = self.need_alloca(expr.custom.unwrap());
|
||||
let loc = expr.location;
|
||||
Ok(match &expr.node {
|
||||
ExprKind::Name { id, .. } => {
|
||||
if let Some(lifetime) = self.variable_mapping.get(id) {
|
||||
Some(*lifetime)
|
||||
if need_alloca {
|
||||
Some(self.builder.append_ir(VarAccess { var: *id }, loc))
|
||||
} else {
|
||||
if is_primitive {
|
||||
None
|
||||
} else {
|
||||
let lifetime =
|
||||
self.lifetime_table.add_lifetime(lifetime::LifetimeKind::Global);
|
||||
self.variable_mapping.insert(id.clone(), (lifetime, false));
|
||||
Some((lifetime, false))
|
||||
}
|
||||
None
|
||||
}
|
||||
}
|
||||
ExprKind::Attribute { value, attr, .. } => {
|
||||
if is_primitive {
|
||||
self.get_expr_lifetime(value)?;
|
||||
None
|
||||
if need_alloca {
|
||||
let val = self.handle_expr(value)?.unwrap();
|
||||
Some(self.builder.append_ir(FieldAccess { obj: val, field: *attr }, loc))
|
||||
} else {
|
||||
self.get_expr_lifetime(value)?.map(|lifetime| {
|
||||
(
|
||||
self.lifetime_table.get_field_lifetime(
|
||||
lifetime.0,
|
||||
*attr,
|
||||
&mut self.scope_ctx,
|
||||
),
|
||||
false, // not sure if it is strong update for now...
|
||||
)
|
||||
})
|
||||
self.handle_expr(value)?;
|
||||
None
|
||||
}
|
||||
}
|
||||
ExprKind::Constant { .. } => {
|
||||
if is_primitive {
|
||||
None
|
||||
if need_alloca {
|
||||
Some(self.builder.append_ir(CreateLifetime { kind: Static }, loc))
|
||||
} else {
|
||||
Some((self.lifetime_table.add_lifetime(lifetime::LifetimeKind::Global), false))
|
||||
None
|
||||
}
|
||||
}
|
||||
ExprKind::List { elts, .. } => {
|
||||
let elems =
|
||||
elts.iter()
|
||||
.map(|expr| self.get_expr_lifetime(expr))
|
||||
.collect::<Result<Vec<_>, _>>()?;
|
||||
let elem = elems.into_iter().reduce(|prev, next| {
|
||||
if prev.is_some() {
|
||||
self.lifetime_table.unify(
|
||||
prev.unwrap().0,
|
||||
next.unwrap().0,
|
||||
&mut self.scope_ctx,
|
||||
elts.iter().map(|e| self.handle_expr(e)).collect::<Result<Vec<_>, _>>()?;
|
||||
let list_lifetime =
|
||||
self.builder.append_ir(CreateLifetime { kind: PreciseLocal }, loc);
|
||||
if !elems.is_empty() {
|
||||
if elems[0].is_some() {
|
||||
let elems = elems.into_iter().map(|e| e.unwrap()).collect::<Vec<_>>();
|
||||
let elem_lifetime =
|
||||
self.builder.append_ir(UnifyLifetimes { lifetimes: elems }, loc);
|
||||
self.builder.append_ir(
|
||||
FieldAssign {
|
||||
obj: list_lifetime,
|
||||
field: "$elem".into(),
|
||||
new: elem_lifetime,
|
||||
},
|
||||
loc,
|
||||
);
|
||||
}
|
||||
prev
|
||||
});
|
||||
let list_lifetime = self.lifetime_table.add_lifetime(lifetime::LifetimeKind::Local);
|
||||
|
||||
if let Some(Some(elem)) = elem {
|
||||
self.lifetime_table
|
||||
.set_field_lifetime(
|
||||
list_lifetime,
|
||||
"elem".into(),
|
||||
elem.0,
|
||||
true,
|
||||
&mut self.scope_ctx,
|
||||
)
|
||||
.unwrap();
|
||||
}
|
||||
Some((list_lifetime, true))
|
||||
}
|
||||
ExprKind::Subscript { value, slice, .. } => {
|
||||
// value must be a list, so lifetime cannot be None
|
||||
let (value_lifetime, _) = self.get_expr_lifetime(value)?.unwrap();
|
||||
match &slice.node {
|
||||
ExprKind::Slice { lower, upper, step } => {
|
||||
for expr in [lower, upper, step].iter().filter_map(|x| x.as_ref()) {
|
||||
// account for side effects when computing the slice
|
||||
self.get_expr_lifetime(expr)?;
|
||||
}
|
||||
Some((
|
||||
self.lifetime_table.add_lifetime(lifetime::LifetimeKind::Local),
|
||||
true,
|
||||
))
|
||||
}
|
||||
ExprKind::Constant { value: Constant::Int(v), .. } => {
|
||||
if is_primitive {
|
||||
None
|
||||
} else if let TypeEnum::TList { .. } =
|
||||
&*self.unifier.get_ty(value.custom.unwrap())
|
||||
{
|
||||
Some((
|
||||
self.lifetime_table.get_field_lifetime(
|
||||
value_lifetime,
|
||||
"elem".into(),
|
||||
&mut self.scope_ctx,
|
||||
),
|
||||
false,
|
||||
))
|
||||
} else {
|
||||
// tuple
|
||||
Some((
|
||||
self.lifetime_table.get_field_lifetime(
|
||||
value_lifetime,
|
||||
format!("elem{}", v).into(),
|
||||
&mut self.scope_ctx,
|
||||
),
|
||||
false,
|
||||
))
|
||||
}
|
||||
}
|
||||
_ => {
|
||||
// account for side effects when computing the index
|
||||
self.get_expr_lifetime(slice)?;
|
||||
if is_primitive {
|
||||
None
|
||||
} else {
|
||||
Some((
|
||||
self.lifetime_table.get_field_lifetime(
|
||||
value_lifetime,
|
||||
"elem".into(),
|
||||
&mut self.scope_ctx,
|
||||
),
|
||||
false,
|
||||
))
|
||||
}
|
||||
}
|
||||
} else {
|
||||
let elem_lifetime =
|
||||
self.builder.append_ir(CreateLifetime { kind: PreciseLocal }, loc);
|
||||
self.builder.append_ir(
|
||||
FieldAssign {
|
||||
obj: list_lifetime,
|
||||
field: "$elem".into(),
|
||||
new: elem_lifetime,
|
||||
},
|
||||
loc,
|
||||
);
|
||||
}
|
||||
Some(list_lifetime)
|
||||
}
|
||||
ExprKind::Tuple { elts, .. } => {
|
||||
let elems =
|
||||
elts.iter()
|
||||
.map(|expr| self.get_expr_lifetime(expr))
|
||||
.collect::<Result<Vec<_>, _>>()?;
|
||||
elts.iter().map(|e| self.handle_expr(e)).collect::<Result<Vec<_>, _>>()?;
|
||||
let tuple_lifetime =
|
||||
self.lifetime_table.add_lifetime(lifetime::LifetimeKind::Local);
|
||||
self.builder.append_ir(CreateLifetime { kind: PreciseLocal }, loc);
|
||||
for (i, lifetime) in elems.into_iter().enumerate() {
|
||||
if let Some((lifetime, _)) = lifetime {
|
||||
self.lifetime_table
|
||||
.set_field_lifetime(
|
||||
tuple_lifetime,
|
||||
format!("elem{}", i).into(),
|
||||
lifetime,
|
||||
true,
|
||||
&mut self.scope_ctx,
|
||||
)
|
||||
.unwrap();
|
||||
if let Some(lifetime) = lifetime {
|
||||
self.builder.append_ir(
|
||||
FieldAssign {
|
||||
obj: tuple_lifetime,
|
||||
field: format!("$elem{}", i).into(),
|
||||
new: lifetime,
|
||||
},
|
||||
loc,
|
||||
);
|
||||
}
|
||||
}
|
||||
Some(tuple_lifetime)
|
||||
}
|
||||
ExprKind::Subscript { value, slice, .. } => {
|
||||
let value_lifetime = self.handle_expr(value)?.unwrap();
|
||||
match &slice.node {
|
||||
ExprKind::Slice { lower, upper, step } => {
|
||||
for expr in [lower, upper, step].iter().filter_map(|x| x.as_ref()) {
|
||||
self.handle_expr(expr)?;
|
||||
}
|
||||
let slice_lifetime =
|
||||
self.builder.append_ir(CreateLifetime { kind: PreciseLocal }, loc);
|
||||
let slice_elem = self.builder.append_ir(
|
||||
FieldAccess { obj: value_lifetime, field: "$elem".into() },
|
||||
loc,
|
||||
);
|
||||
self.builder.append_ir(
|
||||
FieldAssign {
|
||||
obj: slice_lifetime,
|
||||
field: "$elem".into(),
|
||||
new: slice_elem,
|
||||
},
|
||||
loc,
|
||||
);
|
||||
Some(slice_lifetime)
|
||||
}
|
||||
ExprKind::Constant { value: Constant::Int(v), .. }
|
||||
if matches!(
|
||||
&*self.unifier.get_ty(value.custom.unwrap()),
|
||||
TypeEnum::TTuple { .. }
|
||||
) =>
|
||||
{
|
||||
Some(self.builder.append_ir(
|
||||
FieldAccess {
|
||||
obj: value_lifetime,
|
||||
field: format!("$elem{}", v).into(),
|
||||
},
|
||||
loc,
|
||||
))
|
||||
}
|
||||
_ => {
|
||||
self.handle_expr(slice)?;
|
||||
if need_alloca {
|
||||
Some(self.builder.append_ir(
|
||||
FieldAccess { obj: value_lifetime, field: "$elem".into() },
|
||||
loc,
|
||||
))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
Some((tuple_lifetime, true))
|
||||
}
|
||||
ExprKind::Call { func, args, keywords } => {
|
||||
let mut lifetimes = Vec::new();
|
||||
for arg in args.iter() {
|
||||
if let Some(lifetime) = self.get_expr_lifetime(arg)? {
|
||||
lifetimes.push(lifetime.0);
|
||||
}
|
||||
}
|
||||
for keyword in keywords.iter() {
|
||||
if let Some(lifetime) = self.get_expr_lifetime(&keyword.node.value)? {
|
||||
lifetimes.push(lifetime.0);
|
||||
let mut lifetimes = vec![];
|
||||
for arg in chain!(args.iter(), keywords.iter().map(|k| k.node.value.as_ref())) {
|
||||
if let Some(lifetime) = self.handle_expr(arg)? {
|
||||
lifetimes.push(lifetime);
|
||||
}
|
||||
}
|
||||
match &func.node {
|
||||
ExprKind::Name { id, .. } => {
|
||||
for lifetime in lifetimes.into_iter() {
|
||||
self.lifetime_table.set_function_params(lifetime, &mut self.scope_ctx);
|
||||
}
|
||||
if is_primitive {
|
||||
None
|
||||
} else {
|
||||
self.builder.append_ir(PassedToFunc { param_lifetimes: lifetimes }, loc);
|
||||
if need_alloca {
|
||||
let id = self
|
||||
.resolver
|
||||
.get_identifier_def(*id)
|
||||
.map_err(|e| format!("{} (at {})", e, func.location))?;
|
||||
// constructors
|
||||
if let TopLevelDef::Class { .. } =
|
||||
&*self.top_level.definitions.read()[id.0].read()
|
||||
{
|
||||
Some((
|
||||
self.lifetime_table.add_lifetime(lifetime::LifetimeKind::Local),
|
||||
true,
|
||||
))
|
||||
Some(
|
||||
self.builder
|
||||
.append_ir(CreateLifetime { kind: PreciseLocal }, loc),
|
||||
)
|
||||
} else {
|
||||
Some((self.lifetime_table.get_unknown_lifetime(), false))
|
||||
Some(self.builder.append_ir(CreateLifetime { kind: Unknown }, loc))
|
||||
}
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
ExprKind::Attribute { value, .. } => {
|
||||
if let Some(lifetime) = self.get_expr_lifetime(value)? {
|
||||
lifetimes.push(lifetime.0);
|
||||
}
|
||||
for lifetime in lifetimes.into_iter() {
|
||||
self.lifetime_table.set_function_params(lifetime, &mut self.scope_ctx);
|
||||
}
|
||||
if is_primitive {
|
||||
None
|
||||
let obj_lifetime = self.handle_expr(value)?.unwrap();
|
||||
lifetimes.push(obj_lifetime);
|
||||
self.builder.append_ir(PassedToFunc { param_lifetimes: lifetimes }, loc);
|
||||
if need_alloca {
|
||||
Some(self.builder.append_ir(CreateLifetime { kind: Unknown }, loc))
|
||||
} else {
|
||||
Some((self.lifetime_table.get_unknown_lifetime(), false))
|
||||
None
|
||||
}
|
||||
}
|
||||
_ => unimplemented!(),
|
||||
}
|
||||
}
|
||||
ExprKind::BinOp { left, right, .. } => {
|
||||
let mut lifetimes = Vec::new();
|
||||
if let Some(l) = self.get_expr_lifetime(left)? {
|
||||
lifetimes.push(l.0);
|
||||
}
|
||||
if let Some(l) = self.get_expr_lifetime(right)? {
|
||||
lifetimes.push(l.0);
|
||||
}
|
||||
for lifetime in lifetimes.into_iter() {
|
||||
self.lifetime_table.set_function_params(lifetime, &mut self.scope_ctx);
|
||||
}
|
||||
if is_primitive {
|
||||
None
|
||||
} else {
|
||||
Some((self.lifetime_table.get_unknown_lifetime(), false))
|
||||
}
|
||||
}
|
||||
ExprKind::BinOp { left, right, .. } => self.handle_unknown_function_call(
|
||||
&[left.as_ref(), right.as_ref()],
|
||||
need_alloca,
|
||||
loc,
|
||||
)?,
|
||||
ExprKind::BoolOp { values, .. } => {
|
||||
for v in values {
|
||||
self.get_expr_lifetime(v)?;
|
||||
}
|
||||
None
|
||||
self.handle_unknown_function_call(&values, need_alloca, loc)?
|
||||
}
|
||||
ExprKind::UnaryOp { operand, .. } => {
|
||||
if let Some(l) = self.get_expr_lifetime(operand)? {
|
||||
self.lifetime_table.set_function_params(l.0, &mut self.scope_ctx);
|
||||
}
|
||||
if is_primitive {
|
||||
None
|
||||
} else {
|
||||
Some((self.lifetime_table.get_unknown_lifetime(), false))
|
||||
}
|
||||
self.handle_unknown_function_call(&[operand.as_ref()], need_alloca, loc)?
|
||||
}
|
||||
ExprKind::Compare { left, comparators, .. } => {
|
||||
let mut lifetimes = Vec::new();
|
||||
if let Some(l) = self.get_expr_lifetime(left)? {
|
||||
lifetimes.push(l.0);
|
||||
}
|
||||
for c in comparators {
|
||||
if let Some(l) = self.get_expr_lifetime(c)? {
|
||||
lifetimes.push(l.0);
|
||||
}
|
||||
}
|
||||
for lifetime in lifetimes.into_iter() {
|
||||
self.lifetime_table.set_function_params(lifetime, &mut self.scope_ctx);
|
||||
}
|
||||
// compare should give bool output, which does not have lifetime
|
||||
None
|
||||
self.handle_unknown_function_call(&[left.as_ref()], false, loc)?;
|
||||
self.handle_unknown_function_call(&comparators, need_alloca, loc)?
|
||||
}
|
||||
ExprKind::IfExp { test, body, orelse } => {
|
||||
self.handle_expr(test)?;
|
||||
let body_bb = self.builder.append_block();
|
||||
let else_bb = self.builder.append_block();
|
||||
let tail_bb = self.builder.append_block();
|
||||
self.builder.append_ir(Branch { targets: vec![body_bb, else_bb] }, test.location);
|
||||
self.builder.position_at_end(body_bb);
|
||||
let body_lifetime = self.handle_expr(body)?;
|
||||
self.builder.append_ir(Branch { targets: vec![tail_bb] }, body.location);
|
||||
self.builder.position_at_end(else_bb);
|
||||
let else_lifetime = self.handle_expr(body)?;
|
||||
self.builder.append_ir(Branch { targets: vec![tail_bb] }, orelse.location);
|
||||
self.builder.position_at_end(tail_bb);
|
||||
if let (Some(body_lifetime), Some(else_lifetime)) = (body_lifetime, else_lifetime) {
|
||||
Some(self.builder.append_ir(
|
||||
UnifyLifetimes { lifetimes: vec![body_lifetime, else_lifetime] },
|
||||
loc,
|
||||
))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
ExprKind::ListComp { elt, generators } => {
|
||||
let Comprehension { target, iter, ifs, .. } = &generators[0];
|
||||
let list_lifetime =
|
||||
self.builder.append_ir(CreateLifetime { kind: PreciseLocal }, loc);
|
||||
let iter_elem_lifetime = self.handle_expr(iter)?.map(|obj| {
|
||||
self.builder
|
||||
.append_ir(FieldAccess { obj, field: "$elem".into() }, iter.location)
|
||||
});
|
||||
let loop_body = self.builder.append_block();
|
||||
let loop_tail = self.builder.append_block();
|
||||
self.builder.append_ir(Branch { targets: vec![loop_body] }, loc);
|
||||
self.builder.position_at_end(loop_body);
|
||||
self.handle_assignment(target, iter_elem_lifetime)?;
|
||||
for ifexpr in ifs.iter() {
|
||||
self.handle_expr(ifexpr)?;
|
||||
}
|
||||
let elem_lifetime = self.handle_expr(elt)?;
|
||||
if let Some(elem_lifetime) = elem_lifetime {
|
||||
self.builder.append_ir(
|
||||
FieldAssign {
|
||||
obj: list_lifetime,
|
||||
field: "$elem".into(),
|
||||
new: elem_lifetime,
|
||||
},
|
||||
elt.location,
|
||||
);
|
||||
}
|
||||
self.builder.append_ir(Branch { targets: vec![loop_body, loop_tail] }, loc);
|
||||
self.builder.position_at_end(loop_tail);
|
||||
Some(list_lifetime)
|
||||
}
|
||||
// TODO: listcomp, ifexpr
|
||||
_ => unimplemented!(),
|
||||
})
|
||||
}
|
||||
@ -320,65 +354,63 @@ impl<'a> LifetimeContext<'a> {
|
||||
fn handle_assignment(
|
||||
&mut self,
|
||||
lhs: &Expr<Option<Type>>,
|
||||
rhs_lifetime: Option<(Lifetime, bool)>,
|
||||
rhs_lifetime: Option<LifetimeId>,
|
||||
) -> Result<(), String> {
|
||||
use LifetimeIR::*;
|
||||
match &lhs.node {
|
||||
ExprKind::Attribute { value, attr, .. } => {
|
||||
let (lhs_lifetime, is_strong_update) = self.get_expr_lifetime(value)?.unwrap();
|
||||
if let Some((lifetime, _)) = rhs_lifetime {
|
||||
self.lifetime_table
|
||||
.set_field_lifetime(
|
||||
lhs_lifetime,
|
||||
*attr,
|
||||
lifetime,
|
||||
is_strong_update,
|
||||
&mut self.scope_ctx,
|
||||
)
|
||||
.map_err(|_| format!("illegal field assignment in {}", lhs.location))?;
|
||||
let value_lifetime = self.handle_expr(value)?.unwrap();
|
||||
if let Some(field_lifetime) = rhs_lifetime {
|
||||
self.builder.append_ir(
|
||||
FieldAssign { obj: value_lifetime, field: *attr, new: field_lifetime },
|
||||
lhs.location,
|
||||
);
|
||||
}
|
||||
}
|
||||
ExprKind::Subscript { value, slice, .. } => {
|
||||
let (list_lifetime, _) = self.get_expr_lifetime(value)?.unwrap();
|
||||
let value_lifetime = self.handle_expr(value)?.unwrap();
|
||||
let elem_lifetime = if let ExprKind::Slice { lower, upper, step } = &slice.node {
|
||||
// compute side effects
|
||||
for expr in [lower, upper, step].iter().filter_map(|x| x.as_ref()) {
|
||||
// account for side effects when computing the slice
|
||||
self.get_expr_lifetime(expr)?;
|
||||
self.handle_expr(expr)?;
|
||||
}
|
||||
if let Some(rhs_lifetime) = rhs_lifetime {
|
||||
// must be a list
|
||||
Some(self.builder.append_ir(
|
||||
FieldAccess { obj: rhs_lifetime, field: "$elem".into() },
|
||||
lhs.location,
|
||||
))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
// slice assignment will copy elements from rhs to lhs
|
||||
self.lifetime_table.get_field_lifetime(
|
||||
rhs_lifetime.unwrap().0,
|
||||
"elem".into(),
|
||||
&mut self.scope_ctx,
|
||||
)
|
||||
} else {
|
||||
// must be list element, as assignment to tuple element is prohibited
|
||||
self.get_expr_lifetime(slice)?;
|
||||
rhs_lifetime.unwrap().0
|
||||
self.handle_expr(slice)?;
|
||||
rhs_lifetime
|
||||
};
|
||||
self.lifetime_table
|
||||
.set_field_lifetime(
|
||||
list_lifetime,
|
||||
"elem".into(),
|
||||
elem_lifetime,
|
||||
false,
|
||||
&mut self.scope_ctx,
|
||||
)
|
||||
.map_err(|_| format!("illegal element assignment in {}", lhs.location))?;
|
||||
// must be a list
|
||||
if let Some(elem_lifetime) = elem_lifetime {
|
||||
self.builder.append_ir(
|
||||
FieldAssign {
|
||||
obj: value_lifetime,
|
||||
field: "$elem".into(),
|
||||
new: elem_lifetime,
|
||||
},
|
||||
lhs.location,
|
||||
);
|
||||
}
|
||||
}
|
||||
ExprKind::Name { id, .. } => {
|
||||
if let Some(lifetime) = rhs_lifetime {
|
||||
self.variable_mapping.insert(*id, lifetime);
|
||||
self.builder.append_ir(VarAssign { var: *id, lifetime }, lhs.location);
|
||||
}
|
||||
}
|
||||
ExprKind::Tuple { elts, .. } => {
|
||||
let rhs_lifetime = rhs_lifetime.unwrap();
|
||||
for (i, e) in elts.iter().enumerate() {
|
||||
let elem_lifetime = self.lifetime_table.get_field_lifetime(
|
||||
rhs_lifetime.unwrap().0,
|
||||
format!("elem{}", i).into(),
|
||||
&mut self.scope_ctx,
|
||||
let elem_lifetime = self.builder.append_ir(
|
||||
FieldAccess { obj: rhs_lifetime, field: format!("$elem{}", i).into() },
|
||||
e.location,
|
||||
);
|
||||
self.handle_assignment(e, Some((elem_lifetime, false)))?;
|
||||
self.handle_assignment(e, Some(elem_lifetime))?;
|
||||
}
|
||||
}
|
||||
_ => unreachable!(),
|
||||
@ -386,18 +418,151 @@ impl<'a> LifetimeContext<'a> {
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn handle_statement(&mut self, stmt: &Stmt<Option<Type>>) -> Result<(), String> {
|
||||
fn handle_statement(&mut self, stmt: &Stmt<Option<Type>>) -> Result<(), String> {
|
||||
use LifetimeIR::*;
|
||||
match &stmt.node {
|
||||
StmtKind::Expr { value, .. } => {
|
||||
self.get_expr_lifetime(value)?;
|
||||
self.handle_expr(value)?;
|
||||
}
|
||||
StmtKind::Assign { targets, value, .. } => {
|
||||
let rhs_lifetime = self.get_expr_lifetime(value)?;
|
||||
for target in targets.iter() {
|
||||
let rhs_lifetime = self.handle_expr(value)?;
|
||||
for target in targets {
|
||||
self.handle_assignment(target, rhs_lifetime)?;
|
||||
}
|
||||
}
|
||||
_ => unimplemented!(),
|
||||
StmtKind::If { test, body, orelse, .. } => {
|
||||
// test should return bool
|
||||
self.handle_expr(test)?;
|
||||
let body_bb = self.builder.append_block();
|
||||
let else_bb = self.builder.append_block();
|
||||
self.builder.append_ir(Branch { targets: vec![body_bb, else_bb] }, stmt.location);
|
||||
self.builder.position_at_end(body_bb);
|
||||
self.handle_statements(&body)?;
|
||||
let body_terminated = self.is_terminated();
|
||||
if orelse.is_empty() {
|
||||
if !body_terminated {
|
||||
// else_bb is the basic block after this if statement
|
||||
self.builder.append_ir(Branch { targets: vec![else_bb] }, stmt.location);
|
||||
self.builder.position_at_end(else_bb);
|
||||
}
|
||||
} else {
|
||||
let tail_bb = self.builder.append_block();
|
||||
if !body_terminated {
|
||||
self.builder.append_ir(Branch { targets: vec![tail_bb] }, stmt.location);
|
||||
}
|
||||
self.builder.position_at_end(else_bb);
|
||||
self.handle_statements(&orelse)?;
|
||||
if !self.is_terminated() {
|
||||
self.builder.append_ir(Branch { targets: vec![tail_bb] }, stmt.location);
|
||||
}
|
||||
self.builder.position_at_end(tail_bb);
|
||||
}
|
||||
}
|
||||
StmtKind::While { test, body, orelse, .. } => {
|
||||
let old_loop_head = self.loop_head;
|
||||
let old_loop_tail = self.loop_tail;
|
||||
let loop_head = self.builder.append_block();
|
||||
let loop_body = self.builder.append_block();
|
||||
let loop_else =
|
||||
if orelse.is_empty() { None } else { Some(self.builder.append_block()) };
|
||||
let loop_tail = self.builder.append_block();
|
||||
self.loop_head = Some(loop_head);
|
||||
self.loop_tail = Some(loop_tail);
|
||||
self.builder.append_ir(Branch { targets: vec![loop_head] }, stmt.location);
|
||||
self.builder.position_at_end(loop_head);
|
||||
self.handle_expr(test)?;
|
||||
self.builder.append_ir(
|
||||
Branch { targets: vec![loop_body, loop_else.unwrap_or(loop_tail)] },
|
||||
stmt.location,
|
||||
);
|
||||
self.builder.position_at_end(loop_body);
|
||||
self.handle_statements(&body)?;
|
||||
if !self.is_terminated() {
|
||||
self.builder.append_ir(Branch { targets: vec![loop_head] }, stmt.location);
|
||||
}
|
||||
|
||||
self.loop_head = old_loop_head;
|
||||
self.loop_tail = old_loop_tail;
|
||||
if let Some(loop_else) = loop_else {
|
||||
self.builder.position_at_end(loop_else);
|
||||
self.handle_statements(&orelse)?;
|
||||
if !self.is_terminated() {
|
||||
self.builder.append_ir(Branch { targets: vec![loop_tail] }, stmt.location);
|
||||
}
|
||||
}
|
||||
self.builder.position_at_end(loop_tail);
|
||||
}
|
||||
StmtKind::For { target, iter, body, orelse, .. } => {
|
||||
let old_loop_head = self.loop_head;
|
||||
let old_loop_tail = self.loop_tail;
|
||||
let loop_head = self.builder.append_block();
|
||||
let loop_body = self.builder.append_block();
|
||||
let loop_else =
|
||||
if orelse.is_empty() { None } else { Some(self.builder.append_block()) };
|
||||
let loop_tail = self.builder.append_block();
|
||||
self.loop_head = Some(loop_head);
|
||||
self.loop_tail = Some(loop_tail);
|
||||
let iter_lifetime = self.handle_expr(iter)?.map(|obj| {
|
||||
self.builder
|
||||
.append_ir(FieldAccess { obj, field: "$elem".into() }, iter.location)
|
||||
});
|
||||
self.builder.append_ir(Branch { targets: vec![loop_head] }, stmt.location);
|
||||
self.builder.position_at_end(loop_head);
|
||||
if let Some(iter_lifetime) = iter_lifetime {
|
||||
self.handle_assignment(target, Some(iter_lifetime))?;
|
||||
}
|
||||
self.builder.append_ir(
|
||||
Branch { targets: vec![loop_body, loop_else.unwrap_or(loop_tail)] },
|
||||
stmt.location,
|
||||
);
|
||||
self.builder.position_at_end(loop_body);
|
||||
self.handle_statements(&body)?;
|
||||
if !self.is_terminated() {
|
||||
self.builder.append_ir(Branch { targets: vec![loop_head] }, stmt.location);
|
||||
}
|
||||
|
||||
self.loop_head = old_loop_head;
|
||||
self.loop_tail = old_loop_tail;
|
||||
if let Some(loop_else) = loop_else {
|
||||
self.builder.position_at_end(loop_else);
|
||||
self.handle_statements(&orelse)?;
|
||||
if !self.is_terminated() {
|
||||
self.builder.append_ir(Branch { targets: vec![loop_tail] }, stmt.location);
|
||||
}
|
||||
}
|
||||
self.builder.position_at_end(loop_tail);
|
||||
}
|
||||
|
||||
StmtKind::Continue { .. } => {
|
||||
if let Some(loop_head) = self.loop_head {
|
||||
self.builder.append_ir(Branch { targets: vec![loop_head] }, stmt.location);
|
||||
} else {
|
||||
return Err(format!("break outside loop"));
|
||||
}
|
||||
}
|
||||
StmtKind::Break { .. } => {
|
||||
if let Some(loop_tail) = self.loop_tail {
|
||||
self.builder.append_ir(Branch { targets: vec![loop_tail] }, stmt.location);
|
||||
} else {
|
||||
return Err(format!("break outside loop"));
|
||||
}
|
||||
}
|
||||
StmtKind::Return { value, .. } => {
|
||||
let val = if let Some(value) = value { self.handle_expr(value)? } else { None };
|
||||
self.builder.append_ir(Return { val }, stmt.location);
|
||||
}
|
||||
StmtKind::Pass { .. } => {}
|
||||
_ => unimplemented!("{:?}", stmt.node),
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn handle_statements(&mut self, stmts: &[Stmt<Option<Type>>]) -> Result<(), String> {
|
||||
for stmt in stmts.iter() {
|
||||
if self.builder.is_terminated(self.builder.get_current_block()) {
|
||||
break;
|
||||
}
|
||||
self.handle_statement(stmt)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
60
nac3core/src/typecheck/escape_analysis/test.rs
Normal file
60
nac3core/src/typecheck/escape_analysis/test.rs
Normal file
@ -0,0 +1,60 @@
|
||||
use super::EscapeAnalyzer;
|
||||
use crate::typecheck::{type_inferencer::test::TestEnvironment, typedef::TypeEnum};
|
||||
use indoc::indoc;
|
||||
use nac3parser::ast::fold::Fold;
|
||||
use std::collections::hash_set::HashSet;
|
||||
use test_case::test_case;
|
||||
|
||||
use nac3parser::parser::parse_program;
|
||||
|
||||
#[test_case(indoc! {"
|
||||
# a: list[list[int32]]
|
||||
b = [1]
|
||||
a[0] = b
|
||||
"}, Err("field lifetime error in unknown: line 3 column 2".into())
|
||||
; "assign global elem")]
|
||||
#[test_case(indoc! {"
|
||||
# a: list[list[int32]]
|
||||
b = [[], []]
|
||||
b[1] = a
|
||||
b[0][0] = [0]
|
||||
"}, Err("field lifetime error in unknown: line 4 column 5".into())
|
||||
; "global unify")]
|
||||
#[test_case(indoc! {"
|
||||
b = [1, 2, 3]
|
||||
c = [a]
|
||||
c[0][0] = b
|
||||
"}, Err("field lifetime error in unknown: line 3 column 5".into())
|
||||
; "global unify 2")]
|
||||
fn test_simple(source: &str, expected_result: Result<(), String>) {
|
||||
let mut env = TestEnvironment::basic_test_env();
|
||||
let mut defined_identifiers: HashSet<_> = env.identifier_mapping.keys().cloned().collect();
|
||||
defined_identifiers.insert("a".into());
|
||||
let mut inferencer = env.get_inferencer();
|
||||
inferencer.defined_identifiers = defined_identifiers.clone();
|
||||
|
||||
let list_int = inferencer.unifier.add_ty(TypeEnum::TList { ty: inferencer.primitives.int32 });
|
||||
let list_list_int = inferencer.unifier.add_ty(TypeEnum::TList { ty: list_int });
|
||||
|
||||
inferencer.variable_mapping.insert("a".into(), list_list_int);
|
||||
let statements = parse_program(source, Default::default()).unwrap();
|
||||
let statements = statements
|
||||
.into_iter()
|
||||
.map(|v| inferencer.fold_stmt(v))
|
||||
.collect::<Result<Vec<_>, _>>()
|
||||
.unwrap();
|
||||
|
||||
inferencer.check_block(&statements, &mut defined_identifiers).unwrap();
|
||||
|
||||
let mut lifetime_ctx = EscapeAnalyzer::new(
|
||||
&mut inferencer.unifier,
|
||||
&mut inferencer.primitives,
|
||||
inferencer.function_data.resolver.clone(),
|
||||
&inferencer.top_level,
|
||||
);
|
||||
lifetime_ctx.handle_statements(&statements).unwrap();
|
||||
lifetime_ctx.builder.remove_empty_bb();
|
||||
let result = lifetime_ctx.builder.analyze();
|
||||
assert_eq!(result, expected_result);
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user