diff options
| -rw-r--r-- | compiler/rustc_hir_typeck/messages.ftl | 5 | ||||
| -rw-r--r-- | compiler/rustc_hir_typeck/src/cast.rs | 68 | ||||
| -rw-r--r-- | compiler/rustc_hir_typeck/src/errors.rs | 46 |
3 files changed, 77 insertions, 42 deletions
diff --git a/compiler/rustc_hir_typeck/messages.ftl b/compiler/rustc_hir_typeck/messages.ftl index 4be3ea890dc..d3689ff08a9 100644 --- a/compiler/rustc_hir_typeck/messages.ftl +++ b/compiler/rustc_hir_typeck/messages.ftl @@ -69,6 +69,11 @@ hir_typeck_lang_start_incorrect_param = parameter {$param_num} of the `start` la hir_typeck_lang_start_incorrect_ret_ty = the return type of the `start` lang item is incorrect .suggestion = change the type from `{$found_ty}` to `{$expected_ty}` +hir_typeck_lossy_provenance_ptr2int = + under strict provenance it is considered bad style to cast pointer `{$expr_ty}` to integer `{$cast_ty}` + .suggestion = use `.addr()` to obtain the address of a pointer + .help = if you can't comply with strict provenance and need to expose the pointer provenance you can use `.expose_addr()` instead + hir_typeck_method_call_on_unknown_raw_pointee = cannot call a method on a raw pointer with an unknown pointee type diff --git a/compiler/rustc_hir_typeck/src/cast.rs b/compiler/rustc_hir_typeck/src/cast.rs index e8d4e6b447f..c8c25eb3c83 100644 --- a/compiler/rustc_hir_typeck/src/cast.rs +++ b/compiler/rustc_hir_typeck/src/cast.rs @@ -30,6 +30,7 @@ use super::FnCtxt; +use crate::errors; use crate::type_error_struct; use hir::ExprKind; use rustc_errors::{ @@ -1007,50 +1008,35 @@ impl<'a, 'tcx> CastCheck<'tcx> { } fn lossy_provenance_ptr2int_lint(&self, fcx: &FnCtxt<'a, 'tcx>, t_c: ty::cast::IntTy) { - fcx.tcx.struct_span_lint_hir( + let expr_prec = self.expr.precedence().order(); + let needs_parens = expr_prec < rustc_ast::util::parser::PREC_POSTFIX; + + let needs_cast = !matches!(t_c, ty::cast::IntTy::U(ty::UintTy::Usize)); + let cast_span = self.expr_span.shrink_to_hi().to(self.cast_span); + let expr_ty = fcx.resolve_vars_if_possible(self.expr_ty); + let cast_ty = fcx.resolve_vars_if_possible(self.cast_ty); + let expr_span = self.expr_span.shrink_to_lo(); + let sugg = match (needs_parens, needs_cast) { + (true, true) => errors::LossyProvenancePtr2IntSuggestion::NeedsParensCast { + expr_span, + cast_span, + cast_ty, + }, + (true, false) => { + errors::LossyProvenancePtr2IntSuggestion::NeedsParens { expr_span, cast_span } + } + (false, true) => { + errors::LossyProvenancePtr2IntSuggestion::NeedsCast { cast_span, cast_ty } + } + (false, false) => errors::LossyProvenancePtr2IntSuggestion::Other { cast_span }, + }; + + let lint = errors::LossyProvenancePtr2Int { expr_ty, cast_ty, sugg }; + fcx.tcx.emit_spanned_lint( lint::builtin::LOSSY_PROVENANCE_CASTS, self.expr.hir_id, self.span, - DelayDm(|| format!( - "under strict provenance it is considered bad style to cast pointer `{}` to integer `{}`", - self.expr_ty, self.cast_ty - )), - |lint| { - let msg = "use `.addr()` to obtain the address of a pointer"; - - let expr_prec = self.expr.precedence().order(); - let needs_parens = expr_prec < rustc_ast::util::parser::PREC_POSTFIX; - - let scalar_cast = match t_c { - ty::cast::IntTy::U(ty::UintTy::Usize) => String::new(), - _ => format!(" as {}", self.cast_ty), - }; - - let cast_span = self.expr_span.shrink_to_hi().to(self.cast_span); - - if needs_parens { - let suggestions = vec![ - (self.expr_span.shrink_to_lo(), String::from("(")), - (cast_span, format!(").addr(){scalar_cast}")), - ]; - - lint.multipart_suggestion(msg, suggestions, Applicability::MaybeIncorrect); - } else { - lint.span_suggestion( - cast_span, - msg, - format!(".addr(){scalar_cast}"), - Applicability::MaybeIncorrect, - ); - } - - lint.help( - "if you can't comply with strict provenance and need to expose the pointer \ - provenance you can use `.expose_addr()` instead" - ); - - lint - }, + lint, ); } diff --git a/compiler/rustc_hir_typeck/src/errors.rs b/compiler/rustc_hir_typeck/src/errors.rs index c1d7056b1a0..8798ff176ec 100644 --- a/compiler/rustc_hir_typeck/src/errors.rs +++ b/compiler/rustc_hir_typeck/src/errors.rs @@ -6,7 +6,7 @@ use rustc_errors::{ AddToDiagnostic, Applicability, Diagnostic, DiagnosticArgValue, IntoDiagnosticArg, MultiSpan, SubdiagnosticMessage, }; -use rustc_macros::{Diagnostic, Subdiagnostic}; +use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic}; use rustc_middle::ty::Ty; use rustc_span::{ edition::{Edition, LATEST_STABLE_EDITION}, @@ -269,6 +269,50 @@ pub struct LangStartIncorrectRetTy<'tcx> { pub found_ty: Ty<'tcx>, } +#[derive(LintDiagnostic)] +#[diag(hir_typeck_lossy_provenance_ptr2int)] +#[help] +pub struct LossyProvenancePtr2Int<'tcx> { + pub expr_ty: Ty<'tcx>, + pub cast_ty: Ty<'tcx>, + #[subdiagnostic] + pub sugg: LossyProvenancePtr2IntSuggestion<'tcx>, +} + +#[derive(Subdiagnostic)] +pub enum LossyProvenancePtr2IntSuggestion<'tcx> { + #[multipart_suggestion(hir_typeck_suggestion, applicability = "maybe-incorrect")] + NeedsParensCast { + #[suggestion_part(code = "(")] + expr_span: Span, + #[suggestion_part(code = ").addr() as {cast_ty}")] + cast_span: Span, + cast_ty: Ty<'tcx>, + }, + #[multipart_suggestion(hir_typeck_suggestion, applicability = "maybe-incorrect")] + NeedsParens { + #[suggestion_part(code = "(")] + expr_span: Span, + #[suggestion_part(code = ").addr()")] + cast_span: Span, + }, + #[suggestion( + hir_typeck_suggestion, + code = ".addr() as {cast_ty}", + applicability = "maybe-incorrect" + )] + NeedsCast { + #[primary_span] + cast_span: Span, + cast_ty: Ty<'tcx>, + }, + #[suggestion(hir_typeck_suggestion, code = ".addr()", applicability = "maybe-incorrect")] + Other { + #[primary_span] + cast_span: Span, + }, +} + #[derive(Subdiagnostic)] pub enum HelpUseLatestEdition { #[help(hir_typeck_help_set_edition_cargo)] |