compiler/rustc_session/src/errors.rs

   1 use std::num::NonZeroU32;
   2
   3 use crate::cgu_reuse_tracker::CguReuse;
   4 use crate::parse::ParseSess;
   5 use rustc_ast::token;
   6 use rustc_ast::util::literal::LitError;
   7 use rustc_errors::MultiSpan;
   8 use rustc_macros::Diagnostic;
   9 use rustc_span::{Span, Symbol};
  10 use rustc_target::spec::{SplitDebuginfo, StackProtector, TargetTriple};
  11
  12 #[derive(Diagnostic)]
  13 #[diag(session_incorrect_cgu_reuse_type)]
  14 pub struct IncorrectCguReuseType<'a> {
  15     #[primary_span]
  16     pub span: Span,
  17     pub cgu_user_name: &'a str,
  18     pub actual_reuse: CguReuse,
  19     pub expected_reuse: CguReuse,
  20     pub at_least: u8,
  21 }
  22
  23 #[derive(Diagnostic)]
  24 #[diag(session_cgu_not_recorded)]
  25 pub struct CguNotRecorded<'a> {
  26     pub cgu_user_name: &'a str,
  27     pub cgu_name: &'a str,
  28 }
  29
  30 #[derive(Diagnostic)]
  31 #[diag(session_feature_gate_error, code = "E0658")]
  32 pub struct FeatureGateError<'a> {
  33     #[primary_span]
  34     pub span: MultiSpan,
  35     pub explain: &'a str,
  36 }
  37
  38 #[derive(Subdiagnostic)]
  39 #[note(session_feature_diagnostic_for_issue)]
  40 pub struct FeatureDiagnosticForIssue {
  41     pub n: NonZeroU32,
  42 }
  43
  44 #[derive(Subdiagnostic)]
  45 #[help(session_feature_diagnostic_help)]
  46 pub struct FeatureDiagnosticHelp {
  47     pub feature: Symbol,
  48 }
  49
  50 #[derive(Diagnostic)]
  51 #[diag(session_not_circumvent_feature)]
  52 pub struct NotCircumventFeature;
  53
  54 #[derive(Diagnostic)]
  55 #[diag(session_linker_plugin_lto_windows_not_supported)]
  56 pub struct LinkerPluginToWindowsNotSupported;
  57
  58 #[derive(Diagnostic)]
  59 #[diag(session_profile_use_file_does_not_exist)]
  60 pub struct ProfileUseFileDoesNotExist<'a> {
  61     pub path: &'a std::path::Path,
  62 }
  63
  64 #[derive(Diagnostic)]
  65 #[diag(session_profile_sample_use_file_does_not_exist)]
  66 pub struct ProfileSampleUseFileDoesNotExist<'a> {
  67     pub path: &'a std::path::Path,
  68 }
  69
  70 #[derive(Diagnostic)]
  71 #[diag(session_target_requires_unwind_tables)]
  72 pub struct TargetRequiresUnwindTables;
  73
  74 #[derive(Diagnostic)]
  75 #[diag(session_sanitizer_not_supported)]
  76 pub struct SanitizerNotSupported {
  77     pub us: String,
  78 }
  79
  80 #[derive(Diagnostic)]
  81 #[diag(session_sanitizers_not_supported)]
  82 pub struct SanitizersNotSupported {
  83     pub us: String,
  84 }
  85
  86 #[derive(Diagnostic)]
  87 #[diag(session_cannot_mix_and_match_sanitizers)]
  88 pub struct CannotMixAndMatchSanitizers {
  89     pub first: String,
  90     pub second: String,
  91 }
  92
  93 #[derive(Diagnostic)]
  94 #[diag(session_cannot_enable_crt_static_linux)]
  95 pub struct CannotEnableCrtStaticLinux;
  96
  97 #[derive(Diagnostic)]
  98 #[diag(session_sanitizer_cfi_enabled)]
  99 pub struct SanitizerCfiEnabled;
 100
 101 #[derive(Diagnostic)]
 102 #[diag(session_unstable_virtual_function_elimination)]
 103 pub struct UnstableVirtualFunctionElimination;
 104
 105 #[derive(Diagnostic)]
 106 #[diag(session_unsupported_dwarf_version)]
 107 pub struct UnsupportedDwarfVersion {
 108     pub dwarf_version: u32,
 109 }
 110
 111 #[derive(Diagnostic)]
 112 #[diag(session_target_stack_protector_not_supported)]
 113 pub struct StackProtectorNotSupportedForTarget<'a> {
 114     pub stack_protector: StackProtector,
 115     pub target_triple: &'a TargetTriple,
 116 }
 117
 118 #[derive(Diagnostic)]
 119 #[diag(session_branch_protection_requires_aarch64)]
 120 pub(crate) struct BranchProtectionRequiresAArch64;
 121
 122 #[derive(Diagnostic)]
 123 #[diag(session_split_debuginfo_unstable_platform)]
 124 pub struct SplitDebugInfoUnstablePlatform {
 125     pub debuginfo: SplitDebuginfo,
 126 }
 127
 128 #[derive(Diagnostic)]
 129 #[diag(session_file_is_not_writeable)]
 130 pub struct FileIsNotWriteable<'a> {
 131     pub file: &'a std::path::Path,
 132 }
 133
 134 #[derive(Diagnostic)]
 135 #[diag(session_crate_name_does_not_match)]
 136 pub struct CrateNameDoesNotMatch {
 137     #[primary_span]
 138     pub span: Span,
 139     pub s: Symbol,
 140     pub name: Symbol,
 141 }
 142
 143 #[derive(Diagnostic)]
 144 #[diag(session_crate_name_invalid)]
 145 pub struct CrateNameInvalid<'a> {
 146     pub s: &'a str,
 147 }
 148
 149 #[derive(Diagnostic)]
 150 #[diag(session_crate_name_empty)]
 151 pub struct CrateNameEmpty {
 152     #[primary_span]
 153     pub span: Option<Span>,
 154 }
 155
 156 #[derive(Diagnostic)]
 157 #[diag(session_invalid_character_in_create_name)]
 158 pub struct InvalidCharacterInCrateName {
 159     #[primary_span]
 160     pub span: Option<Span>,
 161     pub character: char,
 162     pub crate_name: Symbol,
 163 }
 164
 165 #[derive(Subdiagnostic)]
 166 #[multipart_suggestion(session_expr_parentheses_needed, applicability = "machine-applicable")]
 167 pub struct ExprParenthesesNeeded {
 168     #[suggestion_part(code = "(")]
 169     pub left: Span,
 170     #[suggestion_part(code = ")")]
 171     pub right: Span,
 172 }
 173
 174 impl ExprParenthesesNeeded {
 175     pub fn surrounding(s: Span) -> Self {
 176         ExprParenthesesNeeded { left: s.shrink_to_lo(), right: s.shrink_to_hi() }
 177     }
 178 }
 179
 180 #[derive(Diagnostic)]
 181 #[diag(session_skipping_const_checks)]
 182 pub struct SkippingConstChecks {
 183     #[subdiagnostic]
 184     pub unleashed_features: Vec<UnleashedFeatureHelp>,
 185 }
 186
 187 #[derive(Subdiagnostic)]
 188 pub enum UnleashedFeatureHelp {
 189     #[help(session_unleashed_feature_help_named)]
 190     Named {
 191         #[primary_span]
 192         span: Span,
 193         gate: Symbol,
 194     },
 195     #[help(session_unleashed_feature_help_unnamed)]
 196     Unnamed {
 197         #[primary_span]
 198         span: Span,
 199     },
 200 }
 201
 202 #[derive(Diagnostic)]
 203 #[diag(session_invalid_literal_suffix)]
 204 pub(crate) struct InvalidLiteralSuffix<'a> {
 205     #[primary_span]
 206     #[label]
 207     pub span: Span,
 208     // FIXME(#100717)
 209     pub kind: &'a str,
 210     pub suffix: Symbol,
 211 }
 212
 213 #[derive(Diagnostic)]
 214 #[diag(session_invalid_int_literal_width)]
 215 #[help]
 216 pub(crate) struct InvalidIntLiteralWidth {
 217     #[primary_span]
 218     pub span: Span,
 219     pub width: String,
 220 }
 221
 222 #[derive(Diagnostic)]
 223 #[diag(session_invalid_num_literal_base_prefix)]
 224 #[note]
 225 pub(crate) struct InvalidNumLiteralBasePrefix {
 226     #[primary_span]
 227     #[suggestion(applicability = "maybe-incorrect", code = "{fixed}")]
 228     pub span: Span,
 229     pub fixed: String,
 230 }
 231
 232 #[derive(Diagnostic)]
 233 #[diag(session_invalid_num_literal_suffix)]
 234 #[help]
 235 pub(crate) struct InvalidNumLiteralSuffix {
 236     #[primary_span]
 237     #[label]
 238     pub span: Span,
 239     pub suffix: String,
 240 }
 241
 242 #[derive(Diagnostic)]
 243 #[diag(session_invalid_float_literal_width)]
 244 #[help]
 245 pub(crate) struct InvalidFloatLiteralWidth {
 246     #[primary_span]
 247     pub span: Span,
 248     pub width: String,
 249 }
 250
 251 #[derive(Diagnostic)]
 252 #[diag(session_invalid_float_literal_suffix)]
 253 #[help]
 254 pub(crate) struct InvalidFloatLiteralSuffix {
 255     #[primary_span]
 256     #[label]
 257     pub span: Span,
 258     pub suffix: String,
 259 }
 260
 261 #[derive(Diagnostic)]
 262 #[diag(session_int_literal_too_large)]
 263 pub(crate) struct IntLiteralTooLarge {
 264     #[primary_span]
 265     pub span: Span,
 266 }
 267
 268 #[derive(Diagnostic)]
 269 #[diag(session_hexadecimal_float_literal_not_supported)]
 270 pub(crate) struct HexadecimalFloatLiteralNotSupported {
 271     #[primary_span]
 272     #[label(session_not_supported)]
 273     pub span: Span,
 274 }
 275
 276 #[derive(Diagnostic)]
 277 #[diag(session_octal_float_literal_not_supported)]
 278 pub(crate) struct OctalFloatLiteralNotSupported {
 279     #[primary_span]
 280     #[label(session_not_supported)]
 281     pub span: Span,
 282 }
 283
 284 #[derive(Diagnostic)]
 285 #[diag(session_binary_float_literal_not_supported)]
 286 pub(crate) struct BinaryFloatLiteralNotSupported {
 287     #[primary_span]
 288     #[label(session_not_supported)]
 289     pub span: Span,
 290 }
 291
 292 pub fn report_lit_error(sess: &ParseSess, err: LitError, lit: token::Lit, span: Span) {
 293     // Checks if `s` looks like i32 or u1234 etc.
 294     fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
 295         s.len() > 1 && s.starts_with(first_chars) && s[1..].chars().all(|c| c.is_ascii_digit())
 296     }
 297
 298     // Try to lowercase the prefix if the prefix and suffix are valid.
 299     fn fix_base_capitalisation(prefix: &str, suffix: &str) -> Option<String> {
 300         let mut chars = suffix.chars();
 301
 302         let base_char = chars.next().unwrap();
 303         let base = match base_char {
 304             'B' => 2,
 305             'O' => 8,
 306             'X' => 16,
 307             _ => return None,
 308         };
 309
 310         // check that the suffix contains only base-appropriate characters
 311         let valid = prefix == "0"
 312             && chars
 313                 .filter(|c| *c != '_')
 314                 .take_while(|c| *c != 'i' && *c != 'u')
 315                 .all(|c| c.to_digit(base).is_some());
 316
 317         if valid {
 318             Some(format!("0{}{}", base_char.to_ascii_lowercase(), &suffix[1..]))
 319         } else {
 320             None
 321         }
 322     }
 323
 324     let token::Lit { kind, symbol, suffix, .. } = lit;
 325     match err {
 326         // `LexerError` is an error, but it was already reported
 327         // by lexer, so here we don't report it the second time.
 328         LitError::LexerError => {}
 329         LitError::InvalidSuffix => {
 330             if let Some(suffix) = suffix {
 331                 sess.emit_err(InvalidLiteralSuffix { span, kind: kind.descr(), suffix });
 332             }
 333         }
 334         LitError::InvalidIntSuffix => {
 335             let suf = suffix.expect("suffix error with no suffix");
 336             let suf = suf.as_str();
 337             if looks_like_width_suffix(&['i', 'u'], suf) {
 338                 // If it looks like a width, try to be helpful.
 339                 sess.emit_err(InvalidIntLiteralWidth { span, width: suf[1..].into() });
 340             } else if let Some(fixed) = fix_base_capitalisation(symbol.as_str(), suf) {
 341                 sess.emit_err(InvalidNumLiteralBasePrefix { span, fixed });
 342             } else {
 343                 sess.emit_err(InvalidNumLiteralSuffix { span, suffix: suf.to_string() });
 344             }
 345         }
 346         LitError::InvalidFloatSuffix => {
 347             let suf = suffix.expect("suffix error with no suffix");
 348             let suf = suf.as_str();
 349             if looks_like_width_suffix(&['f'], suf) {
 350                 // If it looks like a width, try to be helpful.
 351                 sess.emit_err(InvalidFloatLiteralWidth { span, width: suf[1..].to_string() });
 352             } else {
 353                 sess.emit_err(InvalidFloatLiteralSuffix { span, suffix: suf.to_string() });
 354             }
 355         }
 356         LitError::NonDecimalFloat(base) => {
 357             match base {
 358                 16 => sess.emit_err(HexadecimalFloatLiteralNotSupported { span }),
 359                 8 => sess.emit_err(OctalFloatLiteralNotSupported { span }),
 360                 2 => sess.emit_err(BinaryFloatLiteralNotSupported { span }),
 361                 _ => unreachable!(),
 362             };
 363         }
 364         LitError::IntTooLarge => {
 365             sess.emit_err(IntLiteralTooLarge { span });
 366         }
 367     }
 368 }