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 VARIANT_SIZE_DIFFERENCES,
  99     Allow,
 100     "detects enums with widely varying variant sizes"
 101 }
 102
 103 declare_lint! {
 104     pub FAT_PTR_TRANSMUTES,
 105     Allow,
 106     "detects transmutes of fat pointers"
 107 }
 108
 109 declare_lint! {
 110     pub TRIVIAL_CASTS,
 111     Allow,
 112     "detects trivial casts which could be removed"
 113 }
 114
 115 declare_lint! {
 116     pub TRIVIAL_NUMERIC_CASTS,
 117     Allow,
 118     "detects trivial casts of numeric types which could be removed"
 119 }
 120
 121 declare_lint! {
 122     pub PRIVATE_IN_PUBLIC,
 123     Warn,
 124     "detect private items in public interfaces not caught by the old implementation"
 125 }
 126
 127 declare_lint! {
 128     pub INACCESSIBLE_EXTERN_CRATE,
 129     Warn,
 130     "use of inaccessible extern crate erroneously allowed"
 131 }
 132
 133 declare_lint! {
 134     pub INVALID_TYPE_PARAM_DEFAULT,
 135     Warn,
 136     "type parameter default erroneously allowed in invalid location"
 137 }
 138
 139 declare_lint! {
 140     pub ILLEGAL_FLOATING_POINT_CONSTANT_PATTERN,
 141     Warn,
 142     "floating-point constants cannot be used in patterns"
 143 }
 144
 145 declare_lint! {
 146     pub ILLEGAL_STRUCT_OR_ENUM_CONSTANT_PATTERN,
 147     Warn,
 148     "constants of struct or enum type can only be used in a pattern if \
 149      the struct or enum has `#[derive(PartialEq, Eq)]`"
 150 }
 151
 152 declare_lint! {
 153     pub MATCH_OF_UNIT_VARIANT_VIA_PAREN_DOTDOT,
 154     Deny,
 155     "unit struct or enum variant erroneously allowed to match via path::ident(..)"
 156 }
 157
 158 declare_lint! {
 159     pub RAW_POINTER_DERIVE,
 160     Warn,
 161     "uses of #[derive] with raw pointers are rarely correct"
 162 }
 163
 164 declare_lint! {
 165     pub TRANSMUTE_FROM_FN_ITEM_TYPES,
 166     Warn,
 167     "transmute from function item type to pointer-sized type erroneously allowed"
 168 }
 169
 170 declare_lint! {
 171     pub OVERLAPPING_INHERENT_IMPLS,
 172     Warn,
 173     "two overlapping inherent impls define an item with the same name were erroneously allowed"
 174 }
 175
 176 declare_lint! {
 177     pub RENAMED_AND_REMOVED_LINTS,
 178     Warn,
 179     "lints that have been renamed or removed"
 180 }
 181
 182 declare_lint! {
 183     pub SUPER_OR_SELF_IN_GLOBAL_PATH,
 184     Warn,
 185     "detects super or self keywords at the beginning of global path"
 186 }
 187
 188 /// Does nothing as a lint pass, but registers some `Lint`s
 189 /// which are used by other parts of the compiler.
 190 #[derive(Copy, Clone)]
 191 pub struct HardwiredLints;
 192
 193 impl LintPass for HardwiredLints {
 194     fn get_lints(&self) -> LintArray {
 195         lint_array!(
 196             UNUSED_IMPORTS,
 197             UNUSED_EXTERN_CRATES,
 198             UNUSED_QUALIFICATIONS,
 199             UNKNOWN_LINTS,
 200             UNUSED_VARIABLES,
 201             UNUSED_ASSIGNMENTS,
 202             DEAD_CODE,
 203             UNREACHABLE_CODE,
 204             WARNINGS,
 205             UNUSED_FEATURES,
 206             STABLE_FEATURES,
 207             UNKNOWN_CRATE_TYPES,
 208             VARIANT_SIZE_DIFFERENCES,
 209             FAT_PTR_TRANSMUTES,
 210             TRIVIAL_CASTS,
 211             TRIVIAL_NUMERIC_CASTS,
 212             PRIVATE_IN_PUBLIC,
 213             INACCESSIBLE_EXTERN_CRATE,
 214             INVALID_TYPE_PARAM_DEFAULT,
 215             ILLEGAL_FLOATING_POINT_CONSTANT_PATTERN,
 216             ILLEGAL_STRUCT_OR_ENUM_CONSTANT_PATTERN,
 217             MATCH_OF_UNIT_VARIANT_VIA_PAREN_DOTDOT,
 218             CONST_ERR,
 219             RAW_POINTER_DERIVE,
 220             TRANSMUTE_FROM_FN_ITEM_TYPES,
 221             OVERLAPPING_INHERENT_IMPLS,
 222             RENAMED_AND_REMOVED_LINTS,
 223             SUPER_OR_SELF_IN_GLOBAL_PATH
 224         )
 225     }
 226 }
 227
 228 impl LateLintPass for HardwiredLints {}