src/librustc/lint/builtin.rs

   1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! Some lints that are built in to the compiler.
  12 //!
  13 //! These are the built-in lints that are emitted direct in the main
  14 //! compiler code, rather than using their own custom pass. Those
  15 //! lints are all available in `rustc_lint::builtin`.
  16
  17 use lint::{LintPass, LateLintPass, LintArray};
  18
  19 declare_lint! {
  20     pub UNUSED_IMPORTS,
  21     Warn,
  22     "imports that are never used"
  23 }
  24
  25 declare_lint! {
  26     pub UNUSED_EXTERN_CRATES,
  27     Allow,
  28     "extern crates that are never used"
  29 }
  30
  31 declare_lint! {
  32     pub UNUSED_QUALIFICATIONS,
  33     Allow,
  34     "detects unnecessarily qualified names"
  35 }
  36
  37 declare_lint! {
  38     pub UNKNOWN_LINTS,
  39     Warn,
  40     "unrecognized lint attribute"
  41 }
  42
  43 declare_lint! {
  44     pub UNUSED_VARIABLES,
  45     Warn,
  46     "detect variables which are not used in any way"
  47 }
  48
  49 declare_lint! {
  50     pub UNUSED_ASSIGNMENTS,
  51     Warn,
  52     "detect assignments that will never be read"
  53 }
  54
  55 declare_lint! {
  56     pub DEAD_CODE,
  57     Warn,
  58     "detect unused, unexported items"
  59 }
  60
  61 declare_lint! {
  62     pub UNREACHABLE_CODE,
  63     Warn,
  64     "detects unreachable code paths"
  65 }
  66
  67 declare_lint! {
  68     pub WARNINGS,
  69     Warn,
  70     "mass-change the level for lints which produce warnings"
  71 }
  72
  73 declare_lint! {
  74     pub UNUSED_FEATURES,
  75     Warn,
  76     "unused or unknown features found in crate-level #[feature] directives"
  77 }
  78
  79 declare_lint! {
  80     pub STABLE_FEATURES,
  81     Warn,
  82     "stable features found in #[feature] directive"
  83 }
  84
  85 declare_lint! {
  86     pub UNKNOWN_CRATE_TYPES,
  87     Deny,
  88     "unknown crate type found in #[crate_type] directive"
  89 }
  90
  91 declare_lint! {
  92     pub VARIANT_SIZE_DIFFERENCES,
  93     Allow,
  94     "detects enums with widely varying variant sizes"
  95 }
  96
  97 declare_lint! {
  98     pub FAT_PTR_TRANSMUTES,
  99     Allow,
 100     "detects transmutes of fat pointers"
 101 }
 102
 103 declare_lint! {
 104     pub TRIVIAL_CASTS,
 105     Allow,
 106     "detects trivial casts which could be removed"
 107 }
 108
 109 declare_lint! {
 110     pub TRIVIAL_NUMERIC_CASTS,
 111     Allow,
 112     "detects trivial casts of numeric types which could be removed"
 113 }
 114 /// Does nothing as a lint pass, but registers some `Lint`s
 115 /// which are used by other parts of the compiler.
 116 #[derive(Copy, Clone)]
 117 pub struct HardwiredLints;
 118
 119 impl LintPass for HardwiredLints {
 120     fn get_lints(&self) -> LintArray {
 121         lint_array!(
 122             UNUSED_IMPORTS,
 123             UNUSED_EXTERN_CRATES,
 124             UNUSED_QUALIFICATIONS,
 125             UNKNOWN_LINTS,
 126             UNUSED_VARIABLES,
 127             UNUSED_ASSIGNMENTS,
 128             DEAD_CODE,
 129             UNREACHABLE_CODE,
 130             WARNINGS,
 131             UNUSED_FEATURES,
 132             STABLE_FEATURES,
 133             UNKNOWN_CRATE_TYPES,
 134             VARIANT_SIZE_DIFFERENCES,
 135             FAT_PTR_TRANSMUTES,
 136             TRIVIAL_CASTS,
 137             TRIVIAL_NUMERIC_CASTS
 138         )
 139     }
 140 }
 141
 142 impl LateLintPass for HardwiredLints {}