Auto merge of #6756 - smoelius:clippy_utils, r=flip1995,obi-obk
Factor out `clippy_utils` crate As discussed in https://github.com/rust-lang/rust-clippy/pull/6746, this PR factors out `clippy_lints::utils` as its own crate, `clippy_utils` . This change will allow `clippy_utils` to be used in lints outside of Clippy. There is no plan to publish this crate on `crates.io` (see https://github.com/rust-lang/rust-clippy/pull/6746#issuecomment-780747522). Dependent crates should obtain it from GitHub. changelog: Factor out `clippy_utils` so it can be used by external tools (not published)
This commit is contained in:
bors
commit
489c4f00f9
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@ -18,6 +18,7 @@ out
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*Cargo.lock
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/target
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/clippy_lints/target
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/clippy_utils/target
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/clippy_workspace_tests/target
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/clippy_dev/target
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/rustc_tools_util/target
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@ -18,6 +18,7 @@ edition = "2018"
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[dependencies]
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cargo_metadata = "0.12"
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clippy_utils = { path = "../clippy_utils" }
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if_chain = "1.0.0"
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itertools = "0.9"
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pulldown-cmark = { version = "0.8", default-features = false }
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@ -38,4 +39,4 @@ syn = { version = "1", features = ["full"] }
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[features]
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deny-warnings = []
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# build clippy with internal lints enabled, off by default
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internal-lints = []
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internal-lints = ["clippy_utils/internal-lints"]
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@ -1,574 +1 @@
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#![allow(clippy::float_cmp)]
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use crate::utils::{clip, sext, unsext};
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use if_chain::if_chain;
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use rustc_ast::ast::{self, LitFloatType, LitKind};
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use rustc_data_structures::sync::Lrc;
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use rustc_hir::def::{DefKind, Res};
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use rustc_hir::{BinOp, BinOpKind, Block, Expr, ExprKind, HirId, QPath, UnOp};
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use rustc_lint::LateContext;
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use rustc_middle::mir::interpret::Scalar;
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use rustc_middle::ty::subst::{Subst, SubstsRef};
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use rustc_middle::ty::{self, FloatTy, ScalarInt, Ty, TyCtxt};
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use rustc_middle::{bug, span_bug};
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use rustc_span::symbol::Symbol;
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use std::cmp::Ordering::{self, Equal};
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use std::convert::TryInto;
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use std::hash::{Hash, Hasher};
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/// A `LitKind`-like enum to fold constant `Expr`s into.
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#[derive(Debug, Clone)]
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pub enum Constant {
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/// A `String` (e.g., "abc").
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Str(String),
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/// A binary string (e.g., `b"abc"`).
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Binary(Lrc<[u8]>),
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/// A single `char` (e.g., `'a'`).
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Char(char),
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/// An integer's bit representation.
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Int(u128),
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/// An `f32`.
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F32(f32),
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/// An `f64`.
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F64(f64),
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/// `true` or `false`.
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Bool(bool),
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/// An array of constants.
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Vec(Vec<Constant>),
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/// Also an array, but with only one constant, repeated N times.
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Repeat(Box<Constant>, u64),
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/// A tuple of constants.
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Tuple(Vec<Constant>),
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/// A raw pointer.
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RawPtr(u128),
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/// A reference
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Ref(Box<Constant>),
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/// A literal with syntax error.
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Err(Symbol),
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}
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impl PartialEq for Constant {
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fn eq(&self, other: &Self) -> bool {
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match (self, other) {
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(&Self::Str(ref ls), &Self::Str(ref rs)) => ls == rs,
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(&Self::Binary(ref l), &Self::Binary(ref r)) => l == r,
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(&Self::Char(l), &Self::Char(r)) => l == r,
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(&Self::Int(l), &Self::Int(r)) => l == r,
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(&Self::F64(l), &Self::F64(r)) => {
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// We want `Fw32 == FwAny` and `FwAny == Fw64`, and by transitivity we must have
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// `Fw32 == Fw64`, so don’t compare them.
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// `to_bits` is required to catch non-matching 0.0, -0.0, and NaNs.
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l.to_bits() == r.to_bits()
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},
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(&Self::F32(l), &Self::F32(r)) => {
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// We want `Fw32 == FwAny` and `FwAny == Fw64`, and by transitivity we must have
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// `Fw32 == Fw64`, so don’t compare them.
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// `to_bits` is required to catch non-matching 0.0, -0.0, and NaNs.
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f64::from(l).to_bits() == f64::from(r).to_bits()
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},
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(&Self::Bool(l), &Self::Bool(r)) => l == r,
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(&Self::Vec(ref l), &Self::Vec(ref r)) | (&Self::Tuple(ref l), &Self::Tuple(ref r)) => l == r,
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(&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => ls == rs && lv == rv,
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(&Self::Ref(ref lb), &Self::Ref(ref rb)) => *lb == *rb,
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// TODO: are there inter-type equalities?
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_ => false,
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}
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}
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}
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impl Hash for Constant {
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fn hash<H>(&self, state: &mut H)
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where
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H: Hasher,
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{
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std::mem::discriminant(self).hash(state);
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match *self {
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Self::Str(ref s) => {
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s.hash(state);
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},
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Self::Binary(ref b) => {
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b.hash(state);
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},
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Self::Char(c) => {
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c.hash(state);
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},
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Self::Int(i) => {
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i.hash(state);
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},
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Self::F32(f) => {
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f64::from(f).to_bits().hash(state);
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},
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Self::F64(f) => {
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f.to_bits().hash(state);
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},
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Self::Bool(b) => {
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b.hash(state);
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},
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Self::Vec(ref v) | Self::Tuple(ref v) => {
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v.hash(state);
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},
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Self::Repeat(ref c, l) => {
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c.hash(state);
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l.hash(state);
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},
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Self::RawPtr(u) => {
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u.hash(state);
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},
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Self::Ref(ref r) => {
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r.hash(state);
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},
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Self::Err(ref s) => {
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s.hash(state);
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},
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}
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}
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}
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impl Constant {
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pub fn partial_cmp(tcx: TyCtxt<'_>, cmp_type: Ty<'_>, left: &Self, right: &Self) -> Option<Ordering> {
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match (left, right) {
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(&Self::Str(ref ls), &Self::Str(ref rs)) => Some(ls.cmp(rs)),
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(&Self::Char(ref l), &Self::Char(ref r)) => Some(l.cmp(r)),
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(&Self::Int(l), &Self::Int(r)) => {
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if let ty::Int(int_ty) = *cmp_type.kind() {
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Some(sext(tcx, l, int_ty).cmp(&sext(tcx, r, int_ty)))
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} else {
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Some(l.cmp(&r))
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}
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},
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(&Self::F64(l), &Self::F64(r)) => l.partial_cmp(&r),
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(&Self::F32(l), &Self::F32(r)) => l.partial_cmp(&r),
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(&Self::Bool(ref l), &Self::Bool(ref r)) => Some(l.cmp(r)),
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(&Self::Tuple(ref l), &Self::Tuple(ref r)) | (&Self::Vec(ref l), &Self::Vec(ref r)) => l
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.iter()
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.zip(r.iter())
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.map(|(li, ri)| Self::partial_cmp(tcx, cmp_type, li, ri))
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.find(|r| r.map_or(true, |o| o != Ordering::Equal))
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.unwrap_or_else(|| Some(l.len().cmp(&r.len()))),
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(&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => {
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match Self::partial_cmp(tcx, cmp_type, lv, rv) {
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Some(Equal) => Some(ls.cmp(rs)),
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x => x,
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}
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},
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(&Self::Ref(ref lb), &Self::Ref(ref rb)) => Self::partial_cmp(tcx, cmp_type, lb, rb),
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// TODO: are there any useful inter-type orderings?
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_ => None,
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}
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}
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}
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/// Parses a `LitKind` to a `Constant`.
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pub fn lit_to_constant(lit: &LitKind, ty: Option<Ty<'_>>) -> Constant {
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match *lit {
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LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
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LitKind::Byte(b) => Constant::Int(u128::from(b)),
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LitKind::ByteStr(ref s) => Constant::Binary(Lrc::clone(s)),
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LitKind::Char(c) => Constant::Char(c),
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LitKind::Int(n, _) => Constant::Int(n),
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LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {
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ast::FloatTy::F32 => Constant::F32(is.as_str().parse().unwrap()),
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ast::FloatTy::F64 => Constant::F64(is.as_str().parse().unwrap()),
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},
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LitKind::Float(ref is, LitFloatType::Unsuffixed) => match ty.expect("type of float is known").kind() {
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ty::Float(FloatTy::F32) => Constant::F32(is.as_str().parse().unwrap()),
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ty::Float(FloatTy::F64) => Constant::F64(is.as_str().parse().unwrap()),
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_ => bug!(),
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},
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LitKind::Bool(b) => Constant::Bool(b),
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LitKind::Err(s) => Constant::Err(s),
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}
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}
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pub fn constant<'tcx>(
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lcx: &LateContext<'tcx>,
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typeck_results: &ty::TypeckResults<'tcx>,
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e: &Expr<'_>,
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) -> Option<(Constant, bool)> {
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let mut cx = ConstEvalLateContext {
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lcx,
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typeck_results,
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param_env: lcx.param_env,
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needed_resolution: false,
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substs: lcx.tcx.intern_substs(&[]),
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};
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cx.expr(e).map(|cst| (cst, cx.needed_resolution))
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}
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pub fn constant_simple<'tcx>(
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lcx: &LateContext<'tcx>,
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typeck_results: &ty::TypeckResults<'tcx>,
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e: &Expr<'_>,
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) -> Option<Constant> {
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constant(lcx, typeck_results, e).and_then(|(cst, res)| if res { None } else { Some(cst) })
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}
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/// Creates a `ConstEvalLateContext` from the given `LateContext` and `TypeckResults`.
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pub fn constant_context<'a, 'tcx>(
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lcx: &'a LateContext<'tcx>,
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typeck_results: &'a ty::TypeckResults<'tcx>,
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) -> ConstEvalLateContext<'a, 'tcx> {
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ConstEvalLateContext {
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lcx,
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typeck_results,
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param_env: lcx.param_env,
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needed_resolution: false,
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substs: lcx.tcx.intern_substs(&[]),
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}
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}
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pub struct ConstEvalLateContext<'a, 'tcx> {
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lcx: &'a LateContext<'tcx>,
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typeck_results: &'a ty::TypeckResults<'tcx>,
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param_env: ty::ParamEnv<'tcx>,
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needed_resolution: bool,
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substs: SubstsRef<'tcx>,
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}
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impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
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/// Simple constant folding: Insert an expression, get a constant or none.
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pub fn expr(&mut self, e: &Expr<'_>) -> Option<Constant> {
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match e.kind {
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ExprKind::Path(ref qpath) => self.fetch_path(qpath, e.hir_id, self.typeck_results.expr_ty(e)),
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ExprKind::Block(ref block, _) => self.block(block),
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ExprKind::Lit(ref lit) => Some(lit_to_constant(&lit.node, self.typeck_results.expr_ty_opt(e))),
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ExprKind::Array(ref vec) => self.multi(vec).map(Constant::Vec),
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ExprKind::Tup(ref tup) => self.multi(tup).map(Constant::Tuple),
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ExprKind::Repeat(ref value, _) => {
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let n = match self.typeck_results.expr_ty(e).kind() {
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ty::Array(_, n) => n.try_eval_usize(self.lcx.tcx, self.lcx.param_env)?,
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_ => span_bug!(e.span, "typeck error"),
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};
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self.expr(value).map(|v| Constant::Repeat(Box::new(v), n))
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},
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ExprKind::Unary(op, ref operand) => self.expr(operand).and_then(|o| match op {
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UnOp::Not => self.constant_not(&o, self.typeck_results.expr_ty(e)),
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UnOp::Neg => self.constant_negate(&o, self.typeck_results.expr_ty(e)),
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UnOp::Deref => Some(if let Constant::Ref(r) = o { *r } else { o }),
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}),
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ExprKind::If(ref cond, ref then, ref otherwise) => self.ifthenelse(cond, then, *otherwise),
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ExprKind::Binary(op, ref left, ref right) => self.binop(op, left, right),
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ExprKind::Call(ref callee, ref args) => {
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// We only handle a few const functions for now.
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if_chain! {
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if args.is_empty();
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if let ExprKind::Path(qpath) = &callee.kind;
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let res = self.typeck_results.qpath_res(qpath, callee.hir_id);
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if let Some(def_id) = res.opt_def_id();
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let def_path: Vec<_> = self.lcx.get_def_path(def_id).into_iter().map(Symbol::as_str).collect();
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let def_path: Vec<&str> = def_path.iter().take(4).map(|s| &**s).collect();
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if let ["core", "num", int_impl, "max_value"] = *def_path;
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then {
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let value = match int_impl {
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"<impl i8>" => i8::MAX as u128,
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"<impl i16>" => i16::MAX as u128,
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"<impl i32>" => i32::MAX as u128,
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"<impl i64>" => i64::MAX as u128,
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"<impl i128>" => i128::MAX as u128,
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_ => return None,
|
||||
};
|
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Some(Constant::Int(value))
|
||||
}
|
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else {
|
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None
|
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}
|
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}
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},
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ExprKind::Index(ref arr, ref index) => self.index(arr, index),
|
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ExprKind::AddrOf(_, _, ref inner) => self.expr(inner).map(|r| Constant::Ref(Box::new(r))),
|
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// TODO: add other expressions.
|
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_ => None,
|
||||
}
|
||||
}
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|
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#[allow(clippy::cast_possible_wrap)]
|
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fn constant_not(&self, o: &Constant, ty: Ty<'_>) -> Option<Constant> {
|
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use self::Constant::{Bool, Int};
|
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match *o {
|
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Bool(b) => Some(Bool(!b)),
|
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Int(value) => {
|
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let value = !value;
|
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match *ty.kind() {
|
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ty::Int(ity) => Some(Int(unsext(self.lcx.tcx, value as i128, ity))),
|
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ty::Uint(ity) => Some(Int(clip(self.lcx.tcx, value, ity))),
|
||||
_ => None,
|
||||
}
|
||||
},
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
fn constant_negate(&self, o: &Constant, ty: Ty<'_>) -> Option<Constant> {
|
||||
use self::Constant::{Int, F32, F64};
|
||||
match *o {
|
||||
Int(value) => {
|
||||
let ity = match *ty.kind() {
|
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ty::Int(ity) => ity,
|
||||
_ => return None,
|
||||
};
|
||||
// sign extend
|
||||
let value = sext(self.lcx.tcx, value, ity);
|
||||
let value = value.checked_neg()?;
|
||||
// clear unused bits
|
||||
Some(Int(unsext(self.lcx.tcx, value, ity)))
|
||||
},
|
||||
F32(f) => Some(F32(-f)),
|
||||
F64(f) => Some(F64(-f)),
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
/// Create `Some(Vec![..])` of all constants, unless there is any
|
||||
/// non-constant part.
|
||||
fn multi(&mut self, vec: &[Expr<'_>]) -> Option<Vec<Constant>> {
|
||||
vec.iter().map(|elem| self.expr(elem)).collect::<Option<_>>()
|
||||
}
|
||||
|
||||
/// Lookup a possibly constant expression from a `ExprKind::Path`.
|
||||
fn fetch_path(&mut self, qpath: &QPath<'_>, id: HirId, ty: Ty<'tcx>) -> Option<Constant> {
|
||||
let res = self.typeck_results.qpath_res(qpath, id);
|
||||
match res {
|
||||
Res::Def(DefKind::Const | DefKind::AssocConst, def_id) => {
|
||||
let substs = self.typeck_results.node_substs(id);
|
||||
let substs = if self.substs.is_empty() {
|
||||
substs
|
||||
} else {
|
||||
substs.subst(self.lcx.tcx, self.substs)
|
||||
};
|
||||
|
||||
let result = self
|
||||
.lcx
|
||||
.tcx
|
||||
.const_eval_resolve(
|
||||
self.param_env,
|
||||
ty::WithOptConstParam::unknown(def_id),
|
||||
substs,
|
||||
None,
|
||||
None,
|
||||
)
|
||||
.ok()
|
||||
.map(|val| rustc_middle::ty::Const::from_value(self.lcx.tcx, val, ty))?;
|
||||
let result = miri_to_const(&result);
|
||||
if result.is_some() {
|
||||
self.needed_resolution = true;
|
||||
}
|
||||
result
|
||||
},
|
||||
// FIXME: cover all usable cases.
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
fn index(&mut self, lhs: &'_ Expr<'_>, index: &'_ Expr<'_>) -> Option<Constant> {
|
||||
let lhs = self.expr(lhs);
|
||||
let index = self.expr(index);
|
||||
|
||||
match (lhs, index) {
|
||||
(Some(Constant::Vec(vec)), Some(Constant::Int(index))) => match vec.get(index as usize) {
|
||||
Some(Constant::F32(x)) => Some(Constant::F32(*x)),
|
||||
Some(Constant::F64(x)) => Some(Constant::F64(*x)),
|
||||
_ => None,
|
||||
},
|
||||
(Some(Constant::Vec(vec)), _) => {
|
||||
if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) {
|
||||
match vec.get(0) {
|
||||
Some(Constant::F32(x)) => Some(Constant::F32(*x)),
|
||||
Some(Constant::F64(x)) => Some(Constant::F64(*x)),
|
||||
_ => None,
|
||||
}
|
||||
} else {
|
||||
None
|
||||
}
|
||||
},
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
/// A block can only yield a constant if it only has one constant expression.
|
||||
fn block(&mut self, block: &Block<'_>) -> Option<Constant> {
|
||||
if block.stmts.is_empty() {
|
||||
block.expr.as_ref().and_then(|b| self.expr(b))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
fn ifthenelse(&mut self, cond: &Expr<'_>, then: &Expr<'_>, otherwise: Option<&Expr<'_>>) -> Option<Constant> {
|
||||
if let Some(Constant::Bool(b)) = self.expr(cond) {
|
||||
if b {
|
||||
self.expr(&*then)
|
||||
} else {
|
||||
otherwise.as_ref().and_then(|expr| self.expr(expr))
|
||||
}
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
fn binop(&mut self, op: BinOp, left: &Expr<'_>, right: &Expr<'_>) -> Option<Constant> {
|
||||
let l = self.expr(left)?;
|
||||
let r = self.expr(right);
|
||||
match (l, r) {
|
||||
(Constant::Int(l), Some(Constant::Int(r))) => match *self.typeck_results.expr_ty_opt(left)?.kind() {
|
||||
ty::Int(ity) => {
|
||||
let l = sext(self.lcx.tcx, l, ity);
|
||||
let r = sext(self.lcx.tcx, r, ity);
|
||||
let zext = |n: i128| Constant::Int(unsext(self.lcx.tcx, n, ity));
|
||||
match op.node {
|
||||
BinOpKind::Add => l.checked_add(r).map(zext),
|
||||
BinOpKind::Sub => l.checked_sub(r).map(zext),
|
||||
BinOpKind::Mul => l.checked_mul(r).map(zext),
|
||||
BinOpKind::Div if r != 0 => l.checked_div(r).map(zext),
|
||||
BinOpKind::Rem if r != 0 => l.checked_rem(r).map(zext),
|
||||
BinOpKind::Shr => l.checked_shr(r.try_into().expect("invalid shift")).map(zext),
|
||||
BinOpKind::Shl => l.checked_shl(r.try_into().expect("invalid shift")).map(zext),
|
||||
BinOpKind::BitXor => Some(zext(l ^ r)),
|
||||
BinOpKind::BitOr => Some(zext(l | r)),
|
||||
BinOpKind::BitAnd => Some(zext(l & r)),
|
||||
BinOpKind::Eq => Some(Constant::Bool(l == r)),
|
||||
BinOpKind::Ne => Some(Constant::Bool(l != r)),
|
||||
BinOpKind::Lt => Some(Constant::Bool(l < r)),
|
||||
BinOpKind::Le => Some(Constant::Bool(l <= r)),
|
||||
BinOpKind::Ge => Some(Constant::Bool(l >= r)),
|
||||
BinOpKind::Gt => Some(Constant::Bool(l > r)),
|
||||
_ => None,
|
||||
}
|
||||
},
|
||||
ty::Uint(_) => match op.node {
|
||||
BinOpKind::Add => l.checked_add(r).map(Constant::Int),
|
||||
BinOpKind::Sub => l.checked_sub(r).map(Constant::Int),
|
||||
BinOpKind::Mul => l.checked_mul(r).map(Constant::Int),
|
||||
BinOpKind::Div => l.checked_div(r).map(Constant::Int),
|
||||
BinOpKind::Rem => l.checked_rem(r).map(Constant::Int),
|
||||
BinOpKind::Shr => l.checked_shr(r.try_into().expect("shift too large")).map(Constant::Int),
|
||||
BinOpKind::Shl => l.checked_shl(r.try_into().expect("shift too large")).map(Constant::Int),
|
||||
BinOpKind::BitXor => Some(Constant::Int(l ^ r)),
|
||||
BinOpKind::BitOr => Some(Constant::Int(l | r)),
|
||||
BinOpKind::BitAnd => Some(Constant::Int(l & r)),
|
||||
BinOpKind::Eq => Some(Constant::Bool(l == r)),
|
||||
BinOpKind::Ne => Some(Constant::Bool(l != r)),
|
||||
BinOpKind::Lt => Some(Constant::Bool(l < r)),
|
||||
BinOpKind::Le => Some(Constant::Bool(l <= r)),
|
||||
BinOpKind::Ge => Some(Constant::Bool(l >= r)),
|
||||
BinOpKind::Gt => Some(Constant::Bool(l > r)),
|
||||
_ => None,
|
||||
},
|
||||
_ => None,
|
||||
},
|
||||
(Constant::F32(l), Some(Constant::F32(r))) => match op.node {
|
||||
BinOpKind::Add => Some(Constant::F32(l + r)),
|
||||
BinOpKind::Sub => Some(Constant::F32(l - r)),
|
||||
BinOpKind::Mul => Some(Constant::F32(l * r)),
|
||||
BinOpKind::Div => Some(Constant::F32(l / r)),
|
||||
BinOpKind::Rem => Some(Constant::F32(l % r)),
|
||||
BinOpKind::Eq => Some(Constant::Bool(l == r)),
|
||||
BinOpKind::Ne => Some(Constant::Bool(l != r)),
|
||||
BinOpKind::Lt => Some(Constant::Bool(l < r)),
|
||||
BinOpKind::Le => Some(Constant::Bool(l <= r)),
|
||||
BinOpKind::Ge => Some(Constant::Bool(l >= r)),
|
||||
BinOpKind::Gt => Some(Constant::Bool(l > r)),
|
||||
_ => None,
|
||||
},
|
||||
(Constant::F64(l), Some(Constant::F64(r))) => match op.node {
|
||||
BinOpKind::Add => Some(Constant::F64(l + r)),
|
||||
BinOpKind::Sub => Some(Constant::F64(l - r)),
|
||||
BinOpKind::Mul => Some(Constant::F64(l * r)),
|
||||
BinOpKind::Div => Some(Constant::F64(l / r)),
|
||||
BinOpKind::Rem => Some(Constant::F64(l % r)),
|
||||
BinOpKind::Eq => Some(Constant::Bool(l == r)),
|
||||
BinOpKind::Ne => Some(Constant::Bool(l != r)),
|
||||
BinOpKind::Lt => Some(Constant::Bool(l < r)),
|
||||
BinOpKind::Le => Some(Constant::Bool(l <= r)),
|
||||
BinOpKind::Ge => Some(Constant::Bool(l >= r)),
|
||||
BinOpKind::Gt => Some(Constant::Bool(l > r)),
|
||||
_ => None,
|
||||
},
|
||||
(l, r) => match (op.node, l, r) {
|
||||
(BinOpKind::And, Constant::Bool(false), _) => Some(Constant::Bool(false)),
|
||||
(BinOpKind::Or, Constant::Bool(true), _) => Some(Constant::Bool(true)),
|
||||
(BinOpKind::And, Constant::Bool(true), Some(r)) | (BinOpKind::Or, Constant::Bool(false), Some(r)) => {
|
||||
Some(r)
|
||||
},
|
||||
(BinOpKind::BitXor, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l ^ r)),
|
||||
(BinOpKind::BitAnd, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l & r)),
|
||||
(BinOpKind::BitOr, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l | r)),
|
||||
_ => None,
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn miri_to_const(result: &ty::Const<'_>) -> Option<Constant> {
|
||||
use rustc_middle::mir::interpret::ConstValue;
|
||||
match result.val {
|
||||
ty::ConstKind::Value(ConstValue::Scalar(Scalar::Int(int))) => {
|
||||
match result.ty.kind() {
|
||||
ty::Bool => Some(Constant::Bool(int == ScalarInt::TRUE)),
|
||||
ty::Uint(_) | ty::Int(_) => Some(Constant::Int(int.assert_bits(int.size()))),
|
||||
ty::Float(FloatTy::F32) => Some(Constant::F32(f32::from_bits(
|
||||
int.try_into().expect("invalid f32 bit representation"),
|
||||
))),
|
||||
ty::Float(FloatTy::F64) => Some(Constant::F64(f64::from_bits(
|
||||
int.try_into().expect("invalid f64 bit representation"),
|
||||
))),
|
||||
ty::RawPtr(type_and_mut) => {
|
||||
if let ty::Uint(_) = type_and_mut.ty.kind() {
|
||||
return Some(Constant::RawPtr(int.assert_bits(int.size())));
|
||||
}
|
||||
None
|
||||
},
|
||||
// FIXME: implement other conversions.
|
||||
_ => None,
|
||||
}
|
||||
},
|
||||
ty::ConstKind::Value(ConstValue::Slice { data, start, end }) => match result.ty.kind() {
|
||||
ty::Ref(_, tam, _) => match tam.kind() {
|
||||
ty::Str => String::from_utf8(
|
||||
data.inspect_with_uninit_and_ptr_outside_interpreter(start..end)
|
||||
.to_owned(),
|
||||
)
|
||||
.ok()
|
||||
.map(Constant::Str),
|
||||
_ => None,
|
||||
},
|
||||
_ => None,
|
||||
},
|
||||
ty::ConstKind::Value(ConstValue::ByRef { alloc, offset: _ }) => match result.ty.kind() {
|
||||
ty::Array(sub_type, len) => match sub_type.kind() {
|
||||
ty::Float(FloatTy::F32) => match miri_to_const(len) {
|
||||
Some(Constant::Int(len)) => alloc
|
||||
.inspect_with_uninit_and_ptr_outside_interpreter(0..(4 * len as usize))
|
||||
.to_owned()
|
||||
.chunks(4)
|
||||
.map(|chunk| {
|
||||
Some(Constant::F32(f32::from_le_bytes(
|
||||
chunk.try_into().expect("this shouldn't happen"),
|
||||
)))
|
||||
})
|
||||
.collect::<Option<Vec<Constant>>>()
|
||||
.map(Constant::Vec),
|
||||
_ => None,
|
||||
},
|
||||
ty::Float(FloatTy::F64) => match miri_to_const(len) {
|
||||
Some(Constant::Int(len)) => alloc
|
||||
.inspect_with_uninit_and_ptr_outside_interpreter(0..(8 * len as usize))
|
||||
.to_owned()
|
||||
.chunks(8)
|
||||
.map(|chunk| {
|
||||
Some(Constant::F64(f64::from_le_bytes(
|
||||
chunk.try_into().expect("this shouldn't happen"),
|
||||
)))
|
||||
})
|
||||
.collect::<Option<Vec<Constant>>>()
|
||||
.map(Constant::Vec),
|
||||
_ => None,
|
||||
},
|
||||
// FIXME: implement other array type conversions.
|
||||
_ => None,
|
||||
},
|
||||
_ => None,
|
||||
},
|
||||
// FIXME: implement other conversions.
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
pub use clippy_utils::consts::*;
|
||||
|
|
|
|||
|
|
@ -1,13 +1,9 @@
|
|||
// error-pattern:cargo-clippy
|
||||
|
||||
#![feature(bindings_after_at)]
|
||||
#![feature(box_patterns)]
|
||||
#![feature(box_syntax)]
|
||||
#![feature(concat_idents)]
|
||||
#![feature(crate_visibility_modifier)]
|
||||
#![feature(drain_filter)]
|
||||
#![feature(in_band_lifetimes)]
|
||||
#![feature(once_cell)]
|
||||
#![feature(or_patterns)]
|
||||
#![feature(rustc_private)]
|
||||
#![feature(stmt_expr_attributes)]
|
||||
|
|
@ -149,6 +145,20 @@ macro_rules! declare_clippy_lint {
|
|||
};
|
||||
}
|
||||
|
||||
#[macro_export]
|
||||
macro_rules! sym {
|
||||
( $($x:tt)* ) => { clippy_utils::sym!($($x)*) }
|
||||
}
|
||||
|
||||
#[macro_export]
|
||||
macro_rules! unwrap_cargo_metadata {
|
||||
( $($x:tt)* ) => { clippy_utils::unwrap_cargo_metadata!($($x)*) }
|
||||
}
|
||||
|
||||
macro_rules! extract_msrv_attr {
|
||||
( $($x:tt)* ) => { clippy_utils::extract_msrv_attr!($($x)*); }
|
||||
}
|
||||
|
||||
mod consts;
|
||||
#[macro_use]
|
||||
mod utils;
|
||||
|
|
|
|||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,19 @@
|
|||
[package]
|
||||
name = "clippy_utils"
|
||||
version = "0.1.52"
|
||||
authors = ["The Rust Clippy Developers"]
|
||||
edition = "2018"
|
||||
publish = false
|
||||
|
||||
[dependencies]
|
||||
if_chain = "1.0.0"
|
||||
itertools = "0.9"
|
||||
regex-syntax = "0.6"
|
||||
serde = { version = "1.0", features = ["derive"] }
|
||||
smallvec = { version = "1", features = ["union"] }
|
||||
toml = "0.5.3"
|
||||
unicode-normalization = "0.1"
|
||||
rustc-semver="1.1.0"
|
||||
|
||||
[features]
|
||||
internal-lints = []
|
||||
|
|
@ -4,7 +4,7 @@
|
|||
|
||||
#![allow(clippy::similar_names, clippy::wildcard_imports, clippy::enum_glob_use)]
|
||||
|
||||
use crate::utils::{both, over};
|
||||
use crate::{both, over};
|
||||
use rustc_ast::ptr::P;
|
||||
use rustc_ast::{self as ast, *};
|
||||
use rustc_span::symbol::Ident;
|
||||
|
|
@ -0,0 +1,574 @@
|
|||
#![allow(clippy::float_cmp)]
|
||||
|
||||
use crate::{clip, sext, unsext};
|
||||
use if_chain::if_chain;
|
||||
use rustc_ast::ast::{self, LitFloatType, LitKind};
|
||||
use rustc_data_structures::sync::Lrc;
|
||||
use rustc_hir::def::{DefKind, Res};
|
||||
use rustc_hir::{BinOp, BinOpKind, Block, Expr, ExprKind, HirId, QPath, UnOp};
|
||||
use rustc_lint::LateContext;
|
||||
use rustc_middle::mir::interpret::Scalar;
|
||||
use rustc_middle::ty::subst::{Subst, SubstsRef};
|
||||
use rustc_middle::ty::{self, FloatTy, ScalarInt, Ty, TyCtxt};
|
||||
use rustc_middle::{bug, span_bug};
|
||||
use rustc_span::symbol::Symbol;
|
||||
use std::cmp::Ordering::{self, Equal};
|
||||
use std::convert::TryInto;
|
||||
use std::hash::{Hash, Hasher};
|
||||
|
||||
/// A `LitKind`-like enum to fold constant `Expr`s into.
|
||||
#[derive(Debug, Clone)]
|
||||
pub enum Constant {
|
||||
/// A `String` (e.g., "abc").
|
||||
Str(String),
|
||||
/// A binary string (e.g., `b"abc"`).
|
||||
Binary(Lrc<[u8]>),
|
||||
/// A single `char` (e.g., `'a'`).
|
||||
Char(char),
|
||||
/// An integer's bit representation.
|
||||
Int(u128),
|
||||
/// An `f32`.
|
||||
F32(f32),
|
||||
/// An `f64`.
|
||||
F64(f64),
|
||||
/// `true` or `false`.
|
||||
Bool(bool),
|
||||
/// An array of constants.
|
||||
Vec(Vec<Constant>),
|
||||
/// Also an array, but with only one constant, repeated N times.
|
||||
Repeat(Box<Constant>, u64),
|
||||
/// A tuple of constants.
|
||||
Tuple(Vec<Constant>),
|
||||
/// A raw pointer.
|
||||
RawPtr(u128),
|
||||
/// A reference
|
||||
Ref(Box<Constant>),
|
||||
/// A literal with syntax error.
|
||||
Err(Symbol),
|
||||
}
|
||||
|
||||
impl PartialEq for Constant {
|
||||
fn eq(&self, other: &Self) -> bool {
|
||||
match (self, other) {
|
||||
(&Self::Str(ref ls), &Self::Str(ref rs)) => ls == rs,
|
||||
(&Self::Binary(ref l), &Self::Binary(ref r)) => l == r,
|
||||
(&Self::Char(l), &Self::Char(r)) => l == r,
|
||||
(&Self::Int(l), &Self::Int(r)) => l == r,
|
||||
(&Self::F64(l), &Self::F64(r)) => {
|
||||
// We want `Fw32 == FwAny` and `FwAny == Fw64`, and by transitivity we must have
|
||||
// `Fw32 == Fw64`, so don’t compare them.
|
||||
// `to_bits` is required to catch non-matching 0.0, -0.0, and NaNs.
|
||||
l.to_bits() == r.to_bits()
|
||||
},
|
||||
(&Self::F32(l), &Self::F32(r)) => {
|
||||
// We want `Fw32 == FwAny` and `FwAny == Fw64`, and by transitivity we must have
|
||||
// `Fw32 == Fw64`, so don’t compare them.
|
||||
// `to_bits` is required to catch non-matching 0.0, -0.0, and NaNs.
|
||||
f64::from(l).to_bits() == f64::from(r).to_bits()
|
||||
},
|
||||
(&Self::Bool(l), &Self::Bool(r)) => l == r,
|
||||
(&Self::Vec(ref l), &Self::Vec(ref r)) | (&Self::Tuple(ref l), &Self::Tuple(ref r)) => l == r,
|
||||
(&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => ls == rs && lv == rv,
|
||||
(&Self::Ref(ref lb), &Self::Ref(ref rb)) => *lb == *rb,
|
||||
// TODO: are there inter-type equalities?
|
||||
_ => false,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Hash for Constant {
|
||||
fn hash<H>(&self, state: &mut H)
|
||||
where
|
||||
H: Hasher,
|
||||
{
|
||||
std::mem::discriminant(self).hash(state);
|
||||
match *self {
|
||||
Self::Str(ref s) => {
|
||||
s.hash(state);
|
||||
},
|
||||
Self::Binary(ref b) => {
|
||||
b.hash(state);
|
||||
},
|
||||
Self::Char(c) => {
|
||||
c.hash(state);
|
||||
},
|
||||
Self::Int(i) => {
|
||||
i.hash(state);
|
||||
},
|
||||
Self::F32(f) => {
|
||||
f64::from(f).to_bits().hash(state);
|
||||
},
|
||||
Self::F64(f) => {
|
||||
f.to_bits().hash(state);
|
||||
},
|
||||
Self::Bool(b) => {
|
||||
b.hash(state);
|
||||
},
|
||||
Self::Vec(ref v) | Self::Tuple(ref v) => {
|
||||
v.hash(state);
|
||||
},
|
||||
Self::Repeat(ref c, l) => {
|
||||
c.hash(state);
|
||||
l.hash(state);
|
||||
},
|
||||
Self::RawPtr(u) => {
|
||||
u.hash(state);
|
||||
},
|
||||
Self::Ref(ref r) => {
|
||||
r.hash(state);
|
||||
},
|
||||
Self::Err(ref s) => {
|
||||
s.hash(state);
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Constant {
|
||||
pub fn partial_cmp(tcx: TyCtxt<'_>, cmp_type: Ty<'_>, left: &Self, right: &Self) -> Option<Ordering> {
|
||||
match (left, right) {
|
||||
(&Self::Str(ref ls), &Self::Str(ref rs)) => Some(ls.cmp(rs)),
|
||||
(&Self::Char(ref l), &Self::Char(ref r)) => Some(l.cmp(r)),
|
||||
(&Self::Int(l), &Self::Int(r)) => {
|
||||
if let ty::Int(int_ty) = *cmp_type.kind() {
|
||||
Some(sext(tcx, l, int_ty).cmp(&sext(tcx, r, int_ty)))
|
||||
} else {
|
||||
Some(l.cmp(&r))
|
||||
}
|
||||
},
|
||||
(&Self::F64(l), &Self::F64(r)) => l.partial_cmp(&r),
|
||||
(&Self::F32(l), &Self::F32(r)) => l.partial_cmp(&r),
|
||||
(&Self::Bool(ref l), &Self::Bool(ref r)) => Some(l.cmp(r)),
|
||||
(&Self::Tuple(ref l), &Self::Tuple(ref r)) | (&Self::Vec(ref l), &Self::Vec(ref r)) => l
|
||||
.iter()
|
||||
.zip(r.iter())
|
||||
.map(|(li, ri)| Self::partial_cmp(tcx, cmp_type, li, ri))
|
||||
.find(|r| r.map_or(true, |o| o != Ordering::Equal))
|
||||
.unwrap_or_else(|| Some(l.len().cmp(&r.len()))),
|
||||
(&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => {
|
||||
match Self::partial_cmp(tcx, cmp_type, lv, rv) {
|
||||
Some(Equal) => Some(ls.cmp(rs)),
|
||||
x => x,
|
||||
}
|
||||
},
|
||||
(&Self::Ref(ref lb), &Self::Ref(ref rb)) => Self::partial_cmp(tcx, cmp_type, lb, rb),
|
||||
// TODO: are there any useful inter-type orderings?
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Parses a `LitKind` to a `Constant`.
|
||||
pub fn lit_to_constant(lit: &LitKind, ty: Option<Ty<'_>>) -> Constant {
|
||||
match *lit {
|
||||
LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
|
||||
LitKind::Byte(b) => Constant::Int(u128::from(b)),
|
||||
LitKind::ByteStr(ref s) => Constant::Binary(Lrc::clone(s)),
|
||||
LitKind::Char(c) => Constant::Char(c),
|
||||
LitKind::Int(n, _) => Constant::Int(n),
|
||||
LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {
|
||||
ast::FloatTy::F32 => Constant::F32(is.as_str().parse().unwrap()),
|
||||
ast::FloatTy::F64 => Constant::F64(is.as_str().parse().unwrap()),
|
||||
},
|
||||
LitKind::Float(ref is, LitFloatType::Unsuffixed) => match ty.expect("type of float is known").kind() {
|
||||
ty::Float(FloatTy::F32) => Constant::F32(is.as_str().parse().unwrap()),
|
||||
ty::Float(FloatTy::F64) => Constant::F64(is.as_str().parse().unwrap()),
|
||||
_ => bug!(),
|
||||
},
|
||||
LitKind::Bool(b) => Constant::Bool(b),
|
||||
LitKind::Err(s) => Constant::Err(s),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn constant<'tcx>(
|
||||
lcx: &LateContext<'tcx>,
|
||||
typeck_results: &ty::TypeckResults<'tcx>,
|
||||
e: &Expr<'_>,
|
||||
) -> Option<(Constant, bool)> {
|
||||
let mut cx = ConstEvalLateContext {
|
||||
lcx,
|
||||
typeck_results,
|
||||
param_env: lcx.param_env,
|
||||
needed_resolution: false,
|
||||
substs: lcx.tcx.intern_substs(&[]),
|
||||
};
|
||||
cx.expr(e).map(|cst| (cst, cx.needed_resolution))
|
||||
}
|
||||
|
||||
pub fn constant_simple<'tcx>(
|
||||
lcx: &LateContext<'tcx>,
|
||||
typeck_results: &ty::TypeckResults<'tcx>,
|
||||
e: &Expr<'_>,
|
||||
) -> Option<Constant> {
|
||||
constant(lcx, typeck_results, e).and_then(|(cst, res)| if res { None } else { Some(cst) })
|
||||
}
|
||||
|
||||
/// Creates a `ConstEvalLateContext` from the given `LateContext` and `TypeckResults`.
|
||||
pub fn constant_context<'a, 'tcx>(
|
||||
lcx: &'a LateContext<'tcx>,
|
||||
typeck_results: &'a ty::TypeckResults<'tcx>,
|
||||
) -> ConstEvalLateContext<'a, 'tcx> {
|
||||
ConstEvalLateContext {
|
||||
lcx,
|
||||
typeck_results,
|
||||
param_env: lcx.param_env,
|
||||
needed_resolution: false,
|
||||
substs: lcx.tcx.intern_substs(&[]),
|
||||
}
|
||||
}
|
||||
|
||||
pub struct ConstEvalLateContext<'a, 'tcx> {
|
||||
lcx: &'a LateContext<'tcx>,
|
||||
typeck_results: &'a ty::TypeckResults<'tcx>,
|
||||
param_env: ty::ParamEnv<'tcx>,
|
||||
needed_resolution: bool,
|
||||
substs: SubstsRef<'tcx>,
|
||||
}
|
||||
|
||||
impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
|
||||
/// Simple constant folding: Insert an expression, get a constant or none.
|
||||
pub fn expr(&mut self, e: &Expr<'_>) -> Option<Constant> {
|
||||
match e.kind {
|
||||
ExprKind::Path(ref qpath) => self.fetch_path(qpath, e.hir_id, self.typeck_results.expr_ty(e)),
|
||||
ExprKind::Block(ref block, _) => self.block(block),
|
||||
ExprKind::Lit(ref lit) => Some(lit_to_constant(&lit.node, self.typeck_results.expr_ty_opt(e))),
|
||||
ExprKind::Array(ref vec) => self.multi(vec).map(Constant::Vec),
|
||||
ExprKind::Tup(ref tup) => self.multi(tup).map(Constant::Tuple),
|
||||
ExprKind::Repeat(ref value, _) => {
|
||||
let n = match self.typeck_results.expr_ty(e).kind() {
|
||||
ty::Array(_, n) => n.try_eval_usize(self.lcx.tcx, self.lcx.param_env)?,
|
||||
_ => span_bug!(e.span, "typeck error"),
|
||||
};
|
||||
self.expr(value).map(|v| Constant::Repeat(Box::new(v), n))
|
||||
},
|
||||
ExprKind::Unary(op, ref operand) => self.expr(operand).and_then(|o| match op {
|
||||
UnOp::Not => self.constant_not(&o, self.typeck_results.expr_ty(e)),
|
||||
UnOp::Neg => self.constant_negate(&o, self.typeck_results.expr_ty(e)),
|
||||
UnOp::Deref => Some(if let Constant::Ref(r) = o { *r } else { o }),
|
||||
}),
|
||||
ExprKind::If(ref cond, ref then, ref otherwise) => self.ifthenelse(cond, then, *otherwise),
|
||||
ExprKind::Binary(op, ref left, ref right) => self.binop(op, left, right),
|
||||
ExprKind::Call(ref callee, ref args) => {
|
||||
// We only handle a few const functions for now.
|
||||
if_chain! {
|
||||
if args.is_empty();
|
||||
if let ExprKind::Path(qpath) = &callee.kind;
|
||||
let res = self.typeck_results.qpath_res(qpath, callee.hir_id);
|
||||
if let Some(def_id) = res.opt_def_id();
|
||||
let def_path: Vec<_> = self.lcx.get_def_path(def_id).into_iter().map(Symbol::as_str).collect();
|
||||
let def_path: Vec<&str> = def_path.iter().take(4).map(|s| &**s).collect();
|
||||
if let ["core", "num", int_impl, "max_value"] = *def_path;
|
||||
then {
|
||||
let value = match int_impl {
|
||||
"<impl i8>" => i8::MAX as u128,
|
||||
"<impl i16>" => i16::MAX as u128,
|
||||
"<impl i32>" => i32::MAX as u128,
|
||||
"<impl i64>" => i64::MAX as u128,
|
||||
"<impl i128>" => i128::MAX as u128,
|
||||
_ => return None,
|
||||
};
|
||||
Some(Constant::Int(value))
|
||||
}
|
||||
else {
|
||||
None
|
||||
}
|
||||
}
|
||||
},
|
||||
ExprKind::Index(ref arr, ref index) => self.index(arr, index),
|
||||
ExprKind::AddrOf(_, _, ref inner) => self.expr(inner).map(|r| Constant::Ref(Box::new(r))),
|
||||
// TODO: add other expressions.
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
#[allow(clippy::cast_possible_wrap)]
|
||||
fn constant_not(&self, o: &Constant, ty: Ty<'_>) -> Option<Constant> {
|
||||
use self::Constant::{Bool, Int};
|
||||
match *o {
|
||||
Bool(b) => Some(Bool(!b)),
|
||||
Int(value) => {
|
||||
let value = !value;
|
||||
match *ty.kind() {
|
||||
ty::Int(ity) => Some(Int(unsext(self.lcx.tcx, value as i128, ity))),
|
||||
ty::Uint(ity) => Some(Int(clip(self.lcx.tcx, value, ity))),
|
||||
_ => None,
|
||||
}
|
||||
},
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
fn constant_negate(&self, o: &Constant, ty: Ty<'_>) -> Option<Constant> {
|
||||
use self::Constant::{Int, F32, F64};
|
||||
match *o {
|
||||
Int(value) => {
|
||||
let ity = match *ty.kind() {
|
||||
ty::Int(ity) => ity,
|
||||
_ => return None,
|
||||
};
|
||||
// sign extend
|
||||
let value = sext(self.lcx.tcx, value, ity);
|
||||
let value = value.checked_neg()?;
|
||||
// clear unused bits
|
||||
Some(Int(unsext(self.lcx.tcx, value, ity)))
|
||||
},
|
||||
F32(f) => Some(F32(-f)),
|
||||
F64(f) => Some(F64(-f)),
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
/// Create `Some(Vec![..])` of all constants, unless there is any
|
||||
/// non-constant part.
|
||||
fn multi(&mut self, vec: &[Expr<'_>]) -> Option<Vec<Constant>> {
|
||||
vec.iter().map(|elem| self.expr(elem)).collect::<Option<_>>()
|
||||
}
|
||||
|
||||
/// Lookup a possibly constant expression from a `ExprKind::Path`.
|
||||
fn fetch_path(&mut self, qpath: &QPath<'_>, id: HirId, ty: Ty<'tcx>) -> Option<Constant> {
|
||||
let res = self.typeck_results.qpath_res(qpath, id);
|
||||
match res {
|
||||
Res::Def(DefKind::Const | DefKind::AssocConst, def_id) => {
|
||||
let substs = self.typeck_results.node_substs(id);
|
||||
let substs = if self.substs.is_empty() {
|
||||
substs
|
||||
} else {
|
||||
substs.subst(self.lcx.tcx, self.substs)
|
||||
};
|
||||
|
||||
let result = self
|
||||
.lcx
|
||||
.tcx
|
||||
.const_eval_resolve(
|
||||
self.param_env,
|
||||
ty::WithOptConstParam::unknown(def_id),
|
||||
substs,
|
||||
None,
|
||||
None,
|
||||
)
|
||||
.ok()
|
||||
.map(|val| rustc_middle::ty::Const::from_value(self.lcx.tcx, val, ty))?;
|
||||
let result = miri_to_const(&result);
|
||||
if result.is_some() {
|
||||
self.needed_resolution = true;
|
||||
}
|
||||
result
|
||||
},
|
||||
// FIXME: cover all usable cases.
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
fn index(&mut self, lhs: &'_ Expr<'_>, index: &'_ Expr<'_>) -> Option<Constant> {
|
||||
let lhs = self.expr(lhs);
|
||||
let index = self.expr(index);
|
||||
|
||||
match (lhs, index) {
|
||||
(Some(Constant::Vec(vec)), Some(Constant::Int(index))) => match vec.get(index as usize) {
|
||||
Some(Constant::F32(x)) => Some(Constant::F32(*x)),
|
||||
Some(Constant::F64(x)) => Some(Constant::F64(*x)),
|
||||
_ => None,
|
||||
},
|
||||
(Some(Constant::Vec(vec)), _) => {
|
||||
if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) {
|
||||
match vec.get(0) {
|
||||
Some(Constant::F32(x)) => Some(Constant::F32(*x)),
|
||||
Some(Constant::F64(x)) => Some(Constant::F64(*x)),
|
||||
_ => None,
|
||||
}
|
||||
} else {
|
||||
None
|
||||
}
|
||||
},
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
/// A block can only yield a constant if it only has one constant expression.
|
||||
fn block(&mut self, block: &Block<'_>) -> Option<Constant> {
|
||||
if block.stmts.is_empty() {
|
||||
block.expr.as_ref().and_then(|b| self.expr(b))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
fn ifthenelse(&mut self, cond: &Expr<'_>, then: &Expr<'_>, otherwise: Option<&Expr<'_>>) -> Option<Constant> {
|
||||
if let Some(Constant::Bool(b)) = self.expr(cond) {
|
||||
if b {
|
||||
self.expr(&*then)
|
||||
} else {
|
||||
otherwise.as_ref().and_then(|expr| self.expr(expr))
|
||||
}
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
fn binop(&mut self, op: BinOp, left: &Expr<'_>, right: &Expr<'_>) -> Option<Constant> {
|
||||
let l = self.expr(left)?;
|
||||
let r = self.expr(right);
|
||||
match (l, r) {
|
||||
(Constant::Int(l), Some(Constant::Int(r))) => match *self.typeck_results.expr_ty_opt(left)?.kind() {
|
||||
ty::Int(ity) => {
|
||||
let l = sext(self.lcx.tcx, l, ity);
|
||||
let r = sext(self.lcx.tcx, r, ity);
|
||||
let zext = |n: i128| Constant::Int(unsext(self.lcx.tcx, n, ity));
|
||||
match op.node {
|
||||
BinOpKind::Add => l.checked_add(r).map(zext),
|
||||
BinOpKind::Sub => l.checked_sub(r).map(zext),
|
||||
BinOpKind::Mul => l.checked_mul(r).map(zext),
|
||||
BinOpKind::Div if r != 0 => l.checked_div(r).map(zext),
|
||||
BinOpKind::Rem if r != 0 => l.checked_rem(r).map(zext),
|
||||
BinOpKind::Shr => l.checked_shr(r.try_into().expect("invalid shift")).map(zext),
|
||||
BinOpKind::Shl => l.checked_shl(r.try_into().expect("invalid shift")).map(zext),
|
||||
BinOpKind::BitXor => Some(zext(l ^ r)),
|
||||
BinOpKind::BitOr => Some(zext(l | r)),
|
||||
BinOpKind::BitAnd => Some(zext(l & r)),
|
||||
BinOpKind::Eq => Some(Constant::Bool(l == r)),
|
||||
BinOpKind::Ne => Some(Constant::Bool(l != r)),
|
||||
BinOpKind::Lt => Some(Constant::Bool(l < r)),
|
||||
BinOpKind::Le => Some(Constant::Bool(l <= r)),
|
||||
BinOpKind::Ge => Some(Constant::Bool(l >= r)),
|
||||
BinOpKind::Gt => Some(Constant::Bool(l > r)),
|
||||
_ => None,
|
||||
}
|
||||
},
|
||||
ty::Uint(_) => match op.node {
|
||||
BinOpKind::Add => l.checked_add(r).map(Constant::Int),
|
||||
BinOpKind::Sub => l.checked_sub(r).map(Constant::Int),
|
||||
BinOpKind::Mul => l.checked_mul(r).map(Constant::Int),
|
||||
BinOpKind::Div => l.checked_div(r).map(Constant::Int),
|
||||
BinOpKind::Rem => l.checked_rem(r).map(Constant::Int),
|
||||
BinOpKind::Shr => l.checked_shr(r.try_into().expect("shift too large")).map(Constant::Int),
|
||||
BinOpKind::Shl => l.checked_shl(r.try_into().expect("shift too large")).map(Constant::Int),
|
||||
BinOpKind::BitXor => Some(Constant::Int(l ^ r)),
|
||||
BinOpKind::BitOr => Some(Constant::Int(l | r)),
|
||||
BinOpKind::BitAnd => Some(Constant::Int(l & r)),
|
||||
BinOpKind::Eq => Some(Constant::Bool(l == r)),
|
||||
BinOpKind::Ne => Some(Constant::Bool(l != r)),
|
||||
BinOpKind::Lt => Some(Constant::Bool(l < r)),
|
||||
BinOpKind::Le => Some(Constant::Bool(l <= r)),
|
||||
BinOpKind::Ge => Some(Constant::Bool(l >= r)),
|
||||
BinOpKind::Gt => Some(Constant::Bool(l > r)),
|
||||
_ => None,
|
||||
},
|
||||
_ => None,
|
||||
},
|
||||
(Constant::F32(l), Some(Constant::F32(r))) => match op.node {
|
||||
BinOpKind::Add => Some(Constant::F32(l + r)),
|
||||
BinOpKind::Sub => Some(Constant::F32(l - r)),
|
||||
BinOpKind::Mul => Some(Constant::F32(l * r)),
|
||||
BinOpKind::Div => Some(Constant::F32(l / r)),
|
||||
BinOpKind::Rem => Some(Constant::F32(l % r)),
|
||||
BinOpKind::Eq => Some(Constant::Bool(l == r)),
|
||||
BinOpKind::Ne => Some(Constant::Bool(l != r)),
|
||||
BinOpKind::Lt => Some(Constant::Bool(l < r)),
|
||||
BinOpKind::Le => Some(Constant::Bool(l <= r)),
|
||||
BinOpKind::Ge => Some(Constant::Bool(l >= r)),
|
||||
BinOpKind::Gt => Some(Constant::Bool(l > r)),
|
||||
_ => None,
|
||||
},
|
||||
(Constant::F64(l), Some(Constant::F64(r))) => match op.node {
|
||||
BinOpKind::Add => Some(Constant::F64(l + r)),
|
||||
BinOpKind::Sub => Some(Constant::F64(l - r)),
|
||||
BinOpKind::Mul => Some(Constant::F64(l * r)),
|
||||
BinOpKind::Div => Some(Constant::F64(l / r)),
|
||||
BinOpKind::Rem => Some(Constant::F64(l % r)),
|
||||
BinOpKind::Eq => Some(Constant::Bool(l == r)),
|
||||
BinOpKind::Ne => Some(Constant::Bool(l != r)),
|
||||
BinOpKind::Lt => Some(Constant::Bool(l < r)),
|
||||
BinOpKind::Le => Some(Constant::Bool(l <= r)),
|
||||
BinOpKind::Ge => Some(Constant::Bool(l >= r)),
|
||||
BinOpKind::Gt => Some(Constant::Bool(l > r)),
|
||||
_ => None,
|
||||
},
|
||||
(l, r) => match (op.node, l, r) {
|
||||
(BinOpKind::And, Constant::Bool(false), _) => Some(Constant::Bool(false)),
|
||||
(BinOpKind::Or, Constant::Bool(true), _) => Some(Constant::Bool(true)),
|
||||
(BinOpKind::And, Constant::Bool(true), Some(r)) | (BinOpKind::Or, Constant::Bool(false), Some(r)) => {
|
||||
Some(r)
|
||||
},
|
||||
(BinOpKind::BitXor, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l ^ r)),
|
||||
(BinOpKind::BitAnd, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l & r)),
|
||||
(BinOpKind::BitOr, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l | r)),
|
||||
_ => None,
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn miri_to_const(result: &ty::Const<'_>) -> Option<Constant> {
|
||||
use rustc_middle::mir::interpret::ConstValue;
|
||||
match result.val {
|
||||
ty::ConstKind::Value(ConstValue::Scalar(Scalar::Int(int))) => {
|
||||
match result.ty.kind() {
|
||||
ty::Bool => Some(Constant::Bool(int == ScalarInt::TRUE)),
|
||||
ty::Uint(_) | ty::Int(_) => Some(Constant::Int(int.assert_bits(int.size()))),
|
||||
ty::Float(FloatTy::F32) => Some(Constant::F32(f32::from_bits(
|
||||
int.try_into().expect("invalid f32 bit representation"),
|
||||
))),
|
||||
ty::Float(FloatTy::F64) => Some(Constant::F64(f64::from_bits(
|
||||
int.try_into().expect("invalid f64 bit representation"),
|
||||
))),
|
||||
ty::RawPtr(type_and_mut) => {
|
||||
if let ty::Uint(_) = type_and_mut.ty.kind() {
|
||||
return Some(Constant::RawPtr(int.assert_bits(int.size())));
|
||||
}
|
||||
None
|
||||
},
|
||||
// FIXME: implement other conversions.
|
||||
_ => None,
|
||||
}
|
||||
},
|
||||
ty::ConstKind::Value(ConstValue::Slice { data, start, end }) => match result.ty.kind() {
|
||||
ty::Ref(_, tam, _) => match tam.kind() {
|
||||
ty::Str => String::from_utf8(
|
||||
data.inspect_with_uninit_and_ptr_outside_interpreter(start..end)
|
||||
.to_owned(),
|
||||
)
|
||||
.ok()
|
||||
.map(Constant::Str),
|
||||
_ => None,
|
||||
},
|
||||
_ => None,
|
||||
},
|
||||
ty::ConstKind::Value(ConstValue::ByRef { alloc, offset: _ }) => match result.ty.kind() {
|
||||
ty::Array(sub_type, len) => match sub_type.kind() {
|
||||
ty::Float(FloatTy::F32) => match miri_to_const(len) {
|
||||
Some(Constant::Int(len)) => alloc
|
||||
.inspect_with_uninit_and_ptr_outside_interpreter(0..(4 * len as usize))
|
||||
.to_owned()
|
||||
.chunks(4)
|
||||
.map(|chunk| {
|
||||
Some(Constant::F32(f32::from_le_bytes(
|
||||
chunk.try_into().expect("this shouldn't happen"),
|
||||
)))
|
||||
})
|
||||
.collect::<Option<Vec<Constant>>>()
|
||||
.map(Constant::Vec),
|
||||
_ => None,
|
||||
},
|
||||
ty::Float(FloatTy::F64) => match miri_to_const(len) {
|
||||
Some(Constant::Int(len)) => alloc
|
||||
.inspect_with_uninit_and_ptr_outside_interpreter(0..(8 * len as usize))
|
||||
.to_owned()
|
||||
.chunks(8)
|
||||
.map(|chunk| {
|
||||
Some(Constant::F64(f64::from_le_bytes(
|
||||
chunk.try_into().expect("this shouldn't happen"),
|
||||
)))
|
||||
})
|
||||
.collect::<Option<Vec<Constant>>>()
|
||||
.map(Constant::Vec),
|
||||
_ => None,
|
||||
},
|
||||
// FIXME: implement other array type conversions.
|
||||
_ => None,
|
||||
},
|
||||
_ => None,
|
||||
},
|
||||
// FIXME: implement other conversions.
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
|
@ -9,7 +9,7 @@
|
|||
//! - or-fun-call
|
||||
//! - option-if-let-else
|
||||
|
||||
use crate::utils::{is_ctor_or_promotable_const_function, is_type_diagnostic_item, match_type, paths};
|
||||
use crate::{is_ctor_or_promotable_const_function, is_type_diagnostic_item, match_type, paths};
|
||||
use rustc_hir::def::{DefKind, Res};
|
||||
|
||||
use rustc_hir::intravisit;
|
||||
|
|
@ -3,7 +3,7 @@
|
|||
|
||||
#![deny(clippy::missing_docs_in_private_items)]
|
||||
|
||||
use crate::utils::{is_expn_of, match_def_path, paths};
|
||||
use crate::{is_expn_of, match_def_path, paths};
|
||||
use if_chain::if_chain;
|
||||
use rustc_ast::ast;
|
||||
use rustc_hir as hir;
|
||||
|
|
@ -1,5 +1,5 @@
|
|||
use crate::consts::{constant_context, constant_simple};
|
||||
use crate::utils::differing_macro_contexts;
|
||||
use crate::differing_macro_contexts;
|
||||
use rustc_ast::ast::InlineAsmTemplatePiece;
|
||||
use rustc_data_structures::fx::FxHashMap;
|
||||
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -1,4 +1,4 @@
|
|||
use crate::utils::{get_pat_name, match_var, snippet};
|
||||
use crate::{get_pat_name, match_var, snippet};
|
||||
use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
|
||||
use rustc_hir::{Body, BodyId, Expr, ExprKind, Param};
|
||||
use rustc_lint::LateContext;
|
||||
|
|
@ -1,7 +1,7 @@
|
|||
//! Contains utility functions to generate suggestions.
|
||||
#![deny(clippy::missing_docs_in_private_items)]
|
||||
|
||||
use crate::utils::{higher, snippet, snippet_opt, snippet_with_macro_callsite};
|
||||
use crate::{higher, snippet, snippet_opt, snippet_with_macro_callsite};
|
||||
use rustc_ast::util::parser::AssocOp;
|
||||
use rustc_ast::{ast, token};
|
||||
use rustc_ast_pretty::pprust::token_kind_to_string;
|
||||
|
|
@ -1,4 +1,4 @@
|
|||
use crate::utils;
|
||||
use crate as utils;
|
||||
use rustc_data_structures::fx::FxHashSet;
|
||||
use rustc_hir as hir;
|
||||
use rustc_hir::def::Res;
|
||||
|
|
@ -1,4 +1,4 @@
|
|||
use crate::utils::path_to_local_id;
|
||||
use crate::path_to_local_id;
|
||||
use rustc_hir as hir;
|
||||
use rustc_hir::intravisit::{self, walk_expr, NestedVisitorMap, Visitor};
|
||||
use rustc_hir::{Arm, Body, Expr, HirId, Stmt};
|
||||
|
|
@ -292,7 +292,7 @@ the next section. Let's worry about the details later and emit our lint for
|
|||
|
||||
Depending on how complex we want our lint message to be, we can choose from a
|
||||
variety of lint emission functions. They can all be found in
|
||||
[`clippy_lints/src/utils/diagnostics.rs`][diagnostics].
|
||||
[`clippy_utils/src/diagnostics.rs`][diagnostics].
|
||||
|
||||
`span_lint_and_help` seems most appropriate in this case. It allows us to
|
||||
provide an extra help message and we can't really suggest a better name
|
||||
|
|
@ -321,7 +321,7 @@ When code or an identifier must appear in a message or label, it should be
|
|||
surrounded with single grave accents \`.
|
||||
|
||||
[check_fn]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html#method.check_fn
|
||||
[diagnostics]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/utils/diagnostics.rs
|
||||
[diagnostics]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_utils/src/diagnostics.rs
|
||||
[the rustc-dev-guide]: https://rustc-dev-guide.rust-lang.org/diagnostics.html
|
||||
|
||||
## Adding the lint logic
|
||||
|
|
@ -537,7 +537,7 @@ directory. Adding a configuration to a lint can be useful for thresholds or to c
|
|||
behavior that can be seen as a false positive for some users. Adding a configuration is done
|
||||
in the following steps:
|
||||
|
||||
1. Adding a new configuration entry to [clippy_lints::utils::conf](/clippy_lints/src/utils/conf.rs)
|
||||
1. Adding a new configuration entry to [clippy_utils::conf](/clippy_utils/src/conf.rs)
|
||||
like this:
|
||||
```rust
|
||||
/// Lint: LINT_NAME. <The configuration field doc comment>
|
||||
|
|
@ -636,7 +636,7 @@ documentation currently. This is unfortunate, but in most cases you can probably
|
|||
get away with copying things from existing similar lints. If you are stuck,
|
||||
don't hesitate to ask on [Zulip] or in the issue/PR.
|
||||
|
||||
[utils]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/utils/mod.rs
|
||||
[utils]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_utils/src/lib.rs
|
||||
[if_chain]: https://docs.rs/if_chain/*/if_chain/
|
||||
[from_expansion]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_span/struct.Span.html#method.from_expansion
|
||||
[in_external_macro]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/lint/fn.in_external_macro.html
|
||||
|
|
|
|||
|
|
@ -78,7 +78,7 @@ impl LateLintPass<'_> for MyStructLint {
|
|||
There are two ways to do this, depending if the target trait is part of lang items.
|
||||
|
||||
```rust
|
||||
use crate::utils::{implements_trait, match_trait_method, paths};
|
||||
use clippy_utils::{implements_trait, match_trait_method, paths};
|
||||
|
||||
impl LateLintPass<'_> for MyStructLint {
|
||||
fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
|
||||
|
|
@ -112,7 +112,7 @@ We access lang items through the type context `tcx`. `tcx` is of type [`TyCtxt`]
|
|||
To check if our type defines a method called `some_method`:
|
||||
|
||||
```rust
|
||||
use crate::utils::{is_type_diagnostic_item, return_ty};
|
||||
use clippy_utils::{is_type_diagnostic_item, return_ty};
|
||||
|
||||
impl<'tcx> LateLintPass<'tcx> for MyTypeImpl {
|
||||
fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx ImplItem<'_>) {
|
||||
|
|
@ -135,7 +135,7 @@ impl<'tcx> LateLintPass<'tcx> for MyTypeImpl {
|
|||
|
||||
# Dealing with macros
|
||||
|
||||
There are several helpers in Clippy's utils to deal with macros:
|
||||
There are several helpers in [`clippy_utils`][utils] to deal with macros:
|
||||
|
||||
- `in_macro()`: detect if the given span is expanded by a macro
|
||||
|
||||
|
|
@ -199,4 +199,5 @@ assert_eq!(differing_macro_contexts(x_is_some_span, x_unwrap_span), true);
|
|||
[LateContext]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LateContext.html
|
||||
[TyCtxt]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TyCtxt.html
|
||||
[pat_ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TypeckResults.html#method.pat_ty
|
||||
[paths]: ../clippy_lints/src/utils/paths.rs
|
||||
[paths]: ../clippy_utils/src/paths.rs
|
||||
[utils]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_utils/src/lib.rs
|
||||
|
|
|
|||
|
|
@ -2,21 +2,24 @@
|
|||
use rustc_tools_util::VersionInfo;
|
||||
|
||||
#[test]
|
||||
fn check_that_clippy_lints_has_the_same_version_as_clippy() {
|
||||
fn check_that_clippy_lints_and_clippy_utils_have_the_same_version_as_clippy() {
|
||||
let clippy_meta = cargo_metadata::MetadataCommand::new()
|
||||
.no_deps()
|
||||
.exec()
|
||||
.expect("could not obtain cargo metadata");
|
||||
std::env::set_current_dir(std::env::current_dir().unwrap().join("clippy_lints")).unwrap();
|
||||
let clippy_lints_meta = cargo_metadata::MetadataCommand::new()
|
||||
.no_deps()
|
||||
.exec()
|
||||
.expect("could not obtain cargo metadata");
|
||||
assert_eq!(clippy_lints_meta.packages[0].version, clippy_meta.packages[0].version);
|
||||
for package in &clippy_meta.packages[0].dependencies {
|
||||
if package.name == "clippy_lints" {
|
||||
assert!(package.req.matches(&clippy_lints_meta.packages[0].version));
|
||||
return;
|
||||
|
||||
for krate in &["clippy_lints", "clippy_utils"] {
|
||||
let krate_meta = clippy_meta
|
||||
.packages
|
||||
.iter()
|
||||
.find(|package| package.name == *krate)
|
||||
.expect("could not obtain cargo metadata");
|
||||
assert_eq!(krate_meta.version, clippy_meta.packages[0].version);
|
||||
for package in &clippy_meta.packages[0].dependencies {
|
||||
if package.name == *krate {
|
||||
assert!(package.req.matches(&krate_meta.version));
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue