1 #![feature(rustc_private)]
3 extern crate clippy_lints;
5 extern crate rustc_const_eval;
6 extern crate rustc_const_math;
9 use clippy_lints::consts::{constant_simple, Constant, FloatWidth};
10 use rustc_const_math::ConstInt;
12 use syntax::ast::{LitIntType, LitKind, NodeId, StrStyle};
13 use syntax::codemap::{Spanned, COMMAND_LINE_SP};
14 use syntax::symbol::Symbol;
16 use syntax::util::ThinVec;
18 fn spanned<T>(t: T) -> Spanned<T> {
21 span: COMMAND_LINE_SP,
25 fn expr(n: Expr_) -> Expr {
29 span: COMMAND_LINE_SP,
30 attrs: ThinVec::new(),
34 fn lit(l: LitKind) -> Expr {
35 expr(ExprLit(P(spanned(l))))
38 fn binop(op: BinOp_, l: Expr, r: Expr) -> Expr {
39 expr(ExprBinary(spanned(op), P(l), P(r)))
42 fn check(expect: Constant, expr: &Expr) {
43 assert_eq!(Some(expect), constant_simple(expr))
46 const TRUE: Constant = Constant::Bool(true);
47 const FALSE: Constant = Constant::Bool(false);
48 const ZERO: Constant = Constant::Int(ConstInt::Infer(0));
49 const ONE: Constant = Constant::Int(ConstInt::Infer(1));
50 const TWO: Constant = Constant::Int(ConstInt::Infer(2));
54 check(TRUE, &lit(LitKind::Bool(true)));
55 check(FALSE, &lit(LitKind::Bool(false)));
56 check(ZERO, &lit(LitKind::Int(0, LitIntType::Unsuffixed)));
57 check(Constant::Str("cool!".into(), StrStyle::Cooked),
58 &lit(LitKind::Str(Symbol::intern("cool!"), StrStyle::Cooked)));
63 check(TRUE, &binop(BiOr, lit(LitKind::Bool(false)), lit(LitKind::Bool(true))));
64 check(FALSE, &binop(BiAnd, lit(LitKind::Bool(false)), lit(LitKind::Bool(true))));
66 let litzero = lit(LitKind::Int(0, LitIntType::Unsuffixed));
67 let litone = lit(LitKind::Int(1, LitIntType::Unsuffixed));
68 check(TRUE, &binop(BiEq, litzero.clone(), litzero.clone()));
69 check(TRUE, &binop(BiGe, litzero.clone(), litzero.clone()));
70 check(TRUE, &binop(BiLe, litzero.clone(), litzero.clone()));
71 check(FALSE, &binop(BiNe, litzero.clone(), litzero.clone()));
72 check(FALSE, &binop(BiGt, litzero.clone(), litzero.clone()));
73 check(FALSE, &binop(BiLt, litzero.clone(), litzero.clone()));
75 check(ZERO, &binop(BiAdd, litzero.clone(), litzero.clone()));
76 check(TWO, &binop(BiAdd, litone.clone(), litone.clone()));
77 check(ONE, &binop(BiSub, litone.clone(), litzero.clone()));
78 check(ONE, &binop(BiMul, litone.clone(), litone.clone()));
79 check(ONE, &binop(BiDiv, litone.clone(), litone.clone()));
81 let half_any = Constant::Float("0.5".into(), FloatWidth::Any);
82 let half32 = Constant::Float("0.5".into(), FloatWidth::F32);
83 let half64 = Constant::Float("0.5".into(), FloatWidth::F64);
84 let pos_zero = Constant::Float("0.0".into(), FloatWidth::F64);
85 let neg_zero = Constant::Float("-0.0".into(), FloatWidth::F64);
87 assert_eq!(pos_zero, pos_zero);
88 assert_eq!(neg_zero, neg_zero);
89 assert_eq!(None, pos_zero.partial_cmp(&neg_zero));
91 assert_eq!(half_any, half32);
92 assert_eq!(half_any, half64);
93 assert_eq!(half32, half64); // for transitivity
95 assert_eq!(Constant::Int(ConstInt::Infer(0)), Constant::Int(ConstInt::U8(0)));
96 assert_eq!(Constant::Int(ConstInt::Infer(0)), Constant::Int(ConstInt::I8(0)));
97 assert_eq!(Constant::Int(ConstInt::InferSigned(-1)), Constant::Int(ConstInt::I8(-1)));