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 UNREACHABLE_PATTERNS,
  75     Warn,
  76     "detects unreachable patterns"
  77 }
  78
  79 declare_lint! {
  80     pub UNUSED_MACROS,
  81     Warn,
  82     "detects macros that were not used"
  83 }
  84
  85 declare_lint! {
  86     pub WARNINGS,
  87     Warn,
  88     "mass-change the level for lints which produce warnings"
  89 }
  90
  91 declare_lint! {
  92     pub UNUSED_FEATURES,
  93     Warn,
  94     "unused or unknown features found in crate-level #[feature] directives"
  95 }
  96
  97 declare_lint! {
  98     pub STABLE_FEATURES,
  99     Warn,
 100     "stable features found in #[feature] directive"
 101 }
 102
 103 declare_lint! {
 104     pub UNKNOWN_CRATE_TYPES,
 105     Deny,
 106     "unknown crate type found in #[crate_type] directive"
 107 }
 108
 109 declare_lint! {
 110     pub FAT_PTR_TRANSMUTES,
 111     Allow,
 112     "detects transmutes of fat pointers"
 113 }
 114
 115 declare_lint! {
 116     pub TRIVIAL_CASTS,
 117     Allow,
 118     "detects trivial casts which could be removed"
 119 }
 120
 121 declare_lint! {
 122     pub TRIVIAL_NUMERIC_CASTS,
 123     Allow,
 124     "detects trivial casts of numeric types which could be removed"
 125 }
 126
 127 declare_lint! {
 128     pub PRIVATE_IN_PUBLIC,
 129     Warn,
 130     "detect private items in public interfaces not caught by the old implementation"
 131 }
 132
 133 declare_lint! {
 134     pub PUB_USE_OF_PRIVATE_EXTERN_CRATE,
 135     Deny,
 136     "detect public reexports of private extern crates"
 137 }
 138
 139 declare_lint! {
 140     pub INVALID_TYPE_PARAM_DEFAULT,
 141     Deny,
 142     "type parameter default erroneously allowed in invalid location"
 143 }
 144
 145 declare_lint! {
 146     pub RENAMED_AND_REMOVED_LINTS,
 147     Warn,
 148     "lints that have been renamed or removed"
 149 }
 150
 151 declare_lint! {
 152     pub RESOLVE_TRAIT_ON_DEFAULTED_UNIT,
 153     Deny,
 154     "attempt to resolve a trait on an expression whose type cannot be inferred but which \
 155      currently defaults to ()"
 156 }
 157
 158 declare_lint! {
 159     pub SAFE_EXTERN_STATICS,
 160     Deny,
 161     "safe access to extern statics was erroneously allowed"
 162 }
 163
 164 declare_lint! {
 165     pub PATTERNS_IN_FNS_WITHOUT_BODY,
 166     Warn,
 167     "patterns in functions without body were erroneously allowed"
 168 }
 169
 170 declare_lint! {
 171     pub EXTRA_REQUIREMENT_IN_IMPL,
 172     Deny,
 173     "detects extra requirements in impls that were erroneously allowed"
 174 }
 175
 176 declare_lint! {
 177     pub LEGACY_DIRECTORY_OWNERSHIP,
 178     Deny,
 179     "non-inline, non-`#[path]` modules (e.g. `mod foo;`) were erroneously allowed in some files \
 180      not named `mod.rs`"
 181 }
 182
 183 declare_lint! {
 184     pub LEGACY_IMPORTS,
 185     Deny,
 186     "detects names that resolve to ambiguous glob imports with RFC 1560"
 187 }
 188
 189 declare_lint! {
 190     pub LEGACY_CONSTRUCTOR_VISIBILITY,
 191     Deny,
 192     "detects use of struct constructors that would be invisible with new visibility rules"
 193 }
 194
 195 declare_lint! {
 196     pub MISSING_FRAGMENT_SPECIFIER,
 197     Deny,
 198     "detects missing fragment specifiers in unused `macro_rules!` patterns"
 199 }
 200
 201 declare_lint! {
 202     pub PARENTHESIZED_PARAMS_IN_TYPES_AND_MODULES,
 203     Deny,
 204     "detects parenthesized generic parameters in type and module names"
 205 }
 206
 207 declare_lint! {
 208     pub DEPRECATED,
 209     Warn,
 210     "detects use of deprecated items"
 211 }
 212
 213 /// Does nothing as a lint pass, but registers some `Lint`s
 214 /// which are used by other parts of the compiler.
 215 #[derive(Copy, Clone)]
 216 pub struct HardwiredLints;
 217
 218 impl LintPass for HardwiredLints {
 219     fn get_lints(&self) -> LintArray {
 220         lint_array!(
 221             UNUSED_IMPORTS,
 222             UNUSED_EXTERN_CRATES,
 223             UNUSED_QUALIFICATIONS,
 224             UNKNOWN_LINTS,
 225             UNUSED_VARIABLES,
 226             UNUSED_ASSIGNMENTS,
 227             DEAD_CODE,
 228             UNREACHABLE_CODE,
 229             UNREACHABLE_PATTERNS,
 230             UNUSED_MACROS,
 231             WARNINGS,
 232             UNUSED_FEATURES,
 233             STABLE_FEATURES,
 234             UNKNOWN_CRATE_TYPES,
 235             FAT_PTR_TRANSMUTES,
 236             TRIVIAL_CASTS,
 237             TRIVIAL_NUMERIC_CASTS,
 238             PRIVATE_IN_PUBLIC,
 239             PUB_USE_OF_PRIVATE_EXTERN_CRATE,
 240             INVALID_TYPE_PARAM_DEFAULT,
 241             CONST_ERR,
 242             RENAMED_AND_REMOVED_LINTS,
 243             RESOLVE_TRAIT_ON_DEFAULTED_UNIT,
 244             SAFE_EXTERN_STATICS,
 245             PATTERNS_IN_FNS_WITHOUT_BODY,
 246             EXTRA_REQUIREMENT_IN_IMPL,
 247             LEGACY_DIRECTORY_OWNERSHIP,
 248             LEGACY_IMPORTS,
 249             LEGACY_CONSTRUCTOR_VISIBILITY,
 250             MISSING_FRAGMENT_SPECIFIER,
 251             PARENTHESIZED_PARAMS_IN_TYPES_AND_MODULES,
 252             DEPRECATED
 253         )
 254     }
 255 }
 256
 257 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for HardwiredLints {}