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treat macros as terminals to prevent cfg! from giving platform specific hints

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This commit is contained in:
Oliver Schneider 2016-03-24 09:37:16 +01:00
parent 0a78a795ab
commit 288ea79963
2 changed files with 23 additions and 17 deletions
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37
src/booleans.rs
View File

@ -54,23 +54,26 @@ impl<'a, 'tcx, 'v> Hir2Qmm<'a, 'tcx, 'v> {
}
fn run(&mut self, e: &'v Expr) -> Result<Bool, String> {
match e.node {
ExprUnary(UnNot, ref inner) => return Ok(Bool::Not(box self.run(inner)?)),
ExprBinary(binop, ref lhs, ref rhs) => {
match binop.node {
BiOr => return Ok(Bool::Or(self.extract(BiOr, &[lhs, rhs], Vec::new())?)),
BiAnd => return Ok(Bool::And(self.extract(BiAnd, &[lhs, rhs], Vec::new())?)),
_ => {},
}
},
ExprLit(ref lit) => {
match lit.node {
LitKind::Bool(true) => return Ok(Bool::True),
LitKind::Bool(false) => return Ok(Bool::False),
_ => {},
}
},
_ => {},
// prevent folding of `cfg!` macros and the like
if !in_macro(self.cx, e.span) {
match e.node {
ExprUnary(UnNot, ref inner) => return Ok(Bool::Not(box self.run(inner)?)),
ExprBinary(binop, ref lhs, ref rhs) => {
match binop.node {
BiOr => return Ok(Bool::Or(self.extract(BiOr, &[lhs, rhs], Vec::new())?)),
BiAnd => return Ok(Bool::And(self.extract(BiAnd, &[lhs, rhs], Vec::new())?)),
_ => {},
}
},
ExprLit(ref lit) => {
match lit.node {
LitKind::Bool(true) => return Ok(Bool::True),
LitKind::Bool(false) => return Ok(Bool::False),
_ => {},
}
},
_ => {},
}
}
if let Some((n, _)) = self.terminals
.iter()

3
tests/compile-fail/booleans.rs
View File

@ -29,4 +29,7 @@ fn main() {
let _ = false || a; //~ ERROR this boolean expression can be simplified
//|~ HELP for further information visit
//|~ SUGGESTION let _ = a;
// don't lint on cfgs
let _ = cfg!(you_shall_not_not_pass) && a;
}