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93 lines
3.1 KiB
Rust
93 lines
3.1 KiB
Rust
#![allow(plugin_as_library)]
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#![feature(rustc_private)]
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extern crate clippy;
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extern crate rustc;
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extern crate rustc_const_eval;
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extern crate rustc_const_math;
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extern crate syntax;
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use clippy::consts::{constant_simple, Constant, FloatWidth};
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use rustc_const_math::ConstInt;
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use rustc::hir::*;
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use syntax::ast::{LitIntType, LitKind, StrStyle};
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use syntax::codemap::{Spanned, COMMAND_LINE_SP};
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use syntax::parse::token::InternedString;
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use syntax::ptr::P;
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fn spanned<T>(t: T) -> Spanned<T> {
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Spanned {
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node: t,
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span: COMMAND_LINE_SP,
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}
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}
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fn expr(n: Expr_) -> Expr {
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Expr {
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id: 1,
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node: n,
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span: COMMAND_LINE_SP,
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attrs: None,
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}
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}
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fn lit(l: LitKind) -> Expr {
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expr(ExprLit(P(spanned(l))))
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}
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fn binop(op: BinOp_, l: Expr, r: Expr) -> Expr {
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expr(ExprBinary(spanned(op), P(l), P(r)))
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}
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fn check(expect: Constant, expr: &Expr) {
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assert_eq!(Some(expect), constant_simple(expr))
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}
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const TRUE: Constant = Constant::Bool(true);
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const FALSE: Constant = Constant::Bool(false);
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const ZERO: Constant = Constant::Int(ConstInt::Infer(0));
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const ONE: Constant = Constant::Int(ConstInt::Infer(1));
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const TWO: Constant = Constant::Int(ConstInt::Infer(2));
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#[test]
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fn test_lit() {
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check(TRUE, &lit(LitKind::Bool(true)));
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check(FALSE, &lit(LitKind::Bool(false)));
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check(ZERO, &lit(LitKind::Int(0, LitIntType::Unsuffixed)));
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check(Constant::Str("cool!".into(), StrStyle::Cooked),
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&lit(LitKind::Str(InternedString::new("cool!"), StrStyle::Cooked)));
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}
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#[test]
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fn test_ops() {
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check(TRUE, &binop(BiOr, lit(LitKind::Bool(false)), lit(LitKind::Bool(true))));
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check(FALSE, &binop(BiAnd, lit(LitKind::Bool(false)), lit(LitKind::Bool(true))));
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let litzero = lit(LitKind::Int(0, LitIntType::Unsuffixed));
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let litone = lit(LitKind::Int(1, LitIntType::Unsuffixed));
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check(TRUE, &binop(BiEq, litzero.clone(), litzero.clone()));
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check(TRUE, &binop(BiGe, litzero.clone(), litzero.clone()));
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check(TRUE, &binop(BiLe, litzero.clone(), litzero.clone()));
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check(FALSE, &binop(BiNe, litzero.clone(), litzero.clone()));
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check(FALSE, &binop(BiGt, litzero.clone(), litzero.clone()));
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check(FALSE, &binop(BiLt, litzero.clone(), litzero.clone()));
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check(ZERO, &binop(BiAdd, litzero.clone(), litzero.clone()));
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check(TWO, &binop(BiAdd, litone.clone(), litone.clone()));
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check(ONE, &binop(BiSub, litone.clone(), litzero.clone()));
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check(ONE, &binop(BiMul, litone.clone(), litone.clone()));
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check(ONE, &binop(BiDiv, litone.clone(), litone.clone()));
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let half_any = Constant::Float("0.5".into(), FloatWidth::Any);
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let half32 = Constant::Float("0.5".into(), FloatWidth::F32);
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let half64 = Constant::Float("0.5".into(), FloatWidth::F64);
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assert_eq!(half_any, half32);
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assert_eq!(half_any, half64);
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assert_eq!(half32, half64); // for transitivity
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assert_eq!(Constant::Int(ConstInt::Infer(0)), Constant::Int(ConstInt::U8(0)));
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assert_eq!(Constant::Int(ConstInt::Infer(0)), Constant::Int(ConstInt::I8(0)));
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assert_eq!(Constant::Int(ConstInt::InferSigned(-1)), Constant::Int(ConstInt::I8(-1)));
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}
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