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 CONST_ERR,
  21     Warn,
  22     "constant evaluation detected erroneous expression"
  23 }
  24
  25 declare_lint! {
  26     pub UNUSED_IMPORTS,
  27     Warn,
  28     "imports that are never used"
  29 }
  30
  31 declare_lint! {
  32     pub UNUSED_EXTERN_CRATES,
  33     Allow,
  34     "extern crates that are never used"
  35 }
  36
  37 declare_lint! {
  38     pub UNUSED_QUALIFICATIONS,
  39     Allow,
  40     "detects unnecessarily qualified names"
  41 }
  42
  43 declare_lint! {
  44     pub UNKNOWN_LINTS,
  45     Warn,
  46     "unrecognized lint attribute"
  47 }
  48
  49 declare_lint! {
  50     pub UNUSED_VARIABLES,
  51     Warn,
  52     "detect variables which are not used in any way"
  53 }
  54
  55 declare_lint! {
  56     pub UNUSED_ASSIGNMENTS,
  57     Warn,
  58     "detect assignments that will never be read"
  59 }
  60
  61 declare_lint! {
  62     pub DEAD_CODE,
  63     Warn,
  64     "detect unused, unexported items"
  65 }
  66
  67 declare_lint! {
  68     pub UNREACHABLE_CODE,
  69     Warn,
  70     "detects unreachable code paths"
  71 }
  72
  73 declare_lint! {
  74     pub WARNINGS,
  75     Warn,
  76     "mass-change the level for lints which produce warnings"
  77 }
  78
  79 declare_lint! {
  80     pub UNUSED_FEATURES,
  81     Warn,
  82     "unused or unknown features found in crate-level #[feature] directives"
  83 }
  84
  85 declare_lint! {
  86     pub STABLE_FEATURES,
  87     Warn,
  88     "stable features found in #[feature] directive"
  89 }
  90
  91 declare_lint! {
  92     pub UNKNOWN_CRATE_TYPES,
  93     Deny,
  94     "unknown crate type found in #[crate_type] directive"
  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
 115 declare_lint! {
 116     pub PRIVATE_IN_PUBLIC,
 117     Warn,
 118     "detect private items in public interfaces not caught by the old implementation"
 119 }
 120
 121 declare_lint! {
 122     pub INACCESSIBLE_EXTERN_CRATE,
 123     Deny,
 124     "use of inaccessible extern crate erroneously allowed"
 125 }
 126
 127 declare_lint! {
 128     pub INVALID_TYPE_PARAM_DEFAULT,
 129     Deny,
 130     "type parameter default erroneously allowed in invalid location"
 131 }
 132
 133 declare_lint! {
 134     pub ILLEGAL_FLOATING_POINT_CONSTANT_PATTERN,
 135     Deny,
 136     "floating-point constants cannot be used in patterns"
 137 }
 138
 139 declare_lint! {
 140     pub ILLEGAL_STRUCT_OR_ENUM_CONSTANT_PATTERN,
 141     Deny,
 142     "constants of struct or enum type can only be used in a pattern if \
 143      the struct or enum has `#[derive(PartialEq, Eq)]`"
 144 }
 145
 146 declare_lint! {
 147     pub RAW_POINTER_DERIVE,
 148     Warn,
 149     "uses of #[derive] with raw pointers are rarely correct"
 150 }
 151
 152 declare_lint! {
 153     pub TRANSMUTE_FROM_FN_ITEM_TYPES,
 154     Deny,
 155     "transmute from function item type to pointer-sized type erroneously allowed"
 156 }
 157
 158 declare_lint! {
 159     pub HR_LIFETIME_IN_ASSOC_TYPE,
 160     Warn,
 161     "binding for associated type references higher-ranked lifetime \
 162      that does not appear in the trait input types"
 163 }
 164
 165 declare_lint! {
 166     pub OVERLAPPING_INHERENT_IMPLS,
 167     Deny,
 168     "two overlapping inherent impls define an item with the same name were erroneously allowed"
 169 }
 170
 171 declare_lint! {
 172     pub RENAMED_AND_REMOVED_LINTS,
 173     Warn,
 174     "lints that have been renamed or removed"
 175 }
 176
 177 declare_lint! {
 178     pub SUPER_OR_SELF_IN_GLOBAL_PATH,
 179     Deny,
 180     "detects super or self keywords at the beginning of global path"
 181 }
 182
 183 declare_lint! {
 184     pub LIFETIME_UNDERSCORE,
 185     Deny,
 186     "lifetimes or labels named `'_` were erroneously allowed"
 187 }
 188
 189 declare_lint! {
 190     pub SAFE_EXTERN_STATICS,
 191     Warn,
 192     "safe access to extern statics was erroneously allowed"
 193 }
 194
 195 declare_lint! {
 196     pub PATTERNS_IN_FNS_WITHOUT_BODY,
 197     Warn,
 198     "patterns in functions without body were erroneously allowed"
 199 }
 200
 201 declare_lint! {
 202     pub EXTRA_REQUIREMENT_IN_IMPL,
 203     Warn,
 204     "detects extra requirements in impls that were erroneously allowed"
 205 }
 206
 207 /// Does nothing as a lint pass, but registers some `Lint`s
 208 /// which are used by other parts of the compiler.
 209 #[derive(Copy, Clone)]
 210 pub struct HardwiredLints;
 211
 212 impl LintPass for HardwiredLints {
 213     fn get_lints(&self) -> LintArray {
 214         lint_array!(
 215             UNUSED_IMPORTS,
 216             UNUSED_EXTERN_CRATES,
 217             UNUSED_QUALIFICATIONS,
 218             UNKNOWN_LINTS,
 219             UNUSED_VARIABLES,
 220             UNUSED_ASSIGNMENTS,
 221             DEAD_CODE,
 222             UNREACHABLE_CODE,
 223             WARNINGS,
 224             UNUSED_FEATURES,
 225             STABLE_FEATURES,
 226             UNKNOWN_CRATE_TYPES,
 227             FAT_PTR_TRANSMUTES,
 228             TRIVIAL_CASTS,
 229             TRIVIAL_NUMERIC_CASTS,
 230             PRIVATE_IN_PUBLIC,
 231             INACCESSIBLE_EXTERN_CRATE,
 232             INVALID_TYPE_PARAM_DEFAULT,
 233             ILLEGAL_FLOATING_POINT_CONSTANT_PATTERN,
 234             ILLEGAL_STRUCT_OR_ENUM_CONSTANT_PATTERN,
 235             CONST_ERR,
 236             RAW_POINTER_DERIVE,
 237             TRANSMUTE_FROM_FN_ITEM_TYPES,
 238             OVERLAPPING_INHERENT_IMPLS,
 239             RENAMED_AND_REMOVED_LINTS,
 240             SUPER_OR_SELF_IN_GLOBAL_PATH,
 241             HR_LIFETIME_IN_ASSOC_TYPE,
 242             LIFETIME_UNDERSCORE,
 243             SAFE_EXTERN_STATICS,
 244             PATTERNS_IN_FNS_WITHOUT_BODY,
 245             EXTRA_REQUIREMENT_IN_IMPL
 246         )
 247     }
 248 }
 249
 250 impl LateLintPass for HardwiredLints {}