From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1643) id F194F3858C00; Mon, 26 Sep 2022 11:04:10 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F194F3858C00 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1664190250; bh=RKag1OiV1qjPXHFJTaY1TAoFoAmUyMST2/3H9Ghg1Io=; h=From:To:Subject:Date:From; b=VUxePRpRHlwWyuJpvmTXTX/63sGi+5iB8W1+SDZq5nwDDc+Ng0XmyvVtUspdxF7yG 1gshXtpjLIIrmkgUbadtHyCbMha0UARxG8/euXqo7jTU5Df8hLHpBjRcJBkjG8OBse Pg8wPttswEJhpas4W3s/kUK+mX2Gfhb6r6B3QYGQ= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Thomas Schwinge To: gcc-cvs@gcc.gnu.org Subject: [gcc/devel/rust/master] const generics: Forbid default values in Functions, Traits and Impls X-Act-Checkin: gcc X-Git-Author: Arthur Cohen X-Git-Refname: refs/heads/devel/rust/master X-Git-Oldrev: f252b4093666cf1e3d948b22f00fc12bf283a83f X-Git-Newrev: 7ebe6693360dceb044fb4eaf6ae83fbb35eef451 Message-Id: <20220926110410.F194F3858C00@sourceware.org> Date: Mon, 26 Sep 2022 11:04:10 +0000 (GMT) List-Id: https://gcc.gnu.org/g:7ebe6693360dceb044fb4eaf6ae83fbb35eef451 commit 7ebe6693360dceb044fb4eaf6ae83fbb35eef451 Author: Arthur Cohen Date: Mon Sep 12 16:26:46 2022 +0200 const generics: Forbid default values in Functions, Traits and Impls Diff: --- gcc/rust/checks/errors/rust-const-checker.cc | 97 ++++++++++++++++++++++++-- gcc/rust/checks/errors/rust-const-checker.h | 25 +++++++ gcc/testsuite/rust/compile/const_generics_8.rs | 12 ++++ 3 files changed, 128 insertions(+), 6 deletions(-) diff --git a/gcc/rust/checks/errors/rust-const-checker.cc b/gcc/rust/checks/errors/rust-const-checker.cc index 35c61fe03f0..a2a6dc21f26 100644 --- a/gcc/rust/checks/errors/rust-const-checker.cc +++ b/gcc/rust/checks/errors/rust-const-checker.cc @@ -52,6 +52,67 @@ ConstChecker::is_const_extern_fn (HIR::ExternalFunctionItem &fn) }); } +const char * +ConstChecker::ctx_to_str (ConstGenericCtx ctx) +{ + switch (ctx) + { + case ConstGenericCtx::Function: + return "function"; + case ConstGenericCtx::TypeAlias: + return "type alias"; + case ConstGenericCtx::Struct: + return "struct"; + case ConstGenericCtx::Enum: + return "enum"; + case ConstGenericCtx::Union: + return "union"; + case ConstGenericCtx::Trait: + return "trait"; + case ConstGenericCtx::Impl: + return "impl"; + default: + gcc_unreachable (); + } +} + +bool +ConstChecker::ctx_allows_default (ConstGenericCtx ctx) +{ + switch (ctx) + { + case ConstGenericCtx::TypeAlias: + case ConstGenericCtx::Struct: + case ConstGenericCtx::Enum: + case ConstGenericCtx::Trait: + return true; + default: + return false; + } +} + +void +ConstChecker::check_default_const_generics ( + std::vector> ¶ms, ConstGenericCtx context) +{ + if (ctx_allows_default (context)) + return; + + for (auto ¶m : params) + { + if (param->get_kind () == GenericParam::GenericKind::CONST) + { + auto const_param = static_cast (param.get ()); + if (const_param->has_default_expression ()) + rust_error_at ( + param->get_locus (), + "default values for const generic parameters are not " + "allowed in %qs items", + ctx_to_str (context)); + } + } +} + void ConstChecker::visit (Lifetime &lifetime) {} @@ -560,6 +621,9 @@ ConstChecker::visit (Function &function) if (const_fn) const_context.enter (function.get_mappings ().get_hirid ()); + check_default_const_generics (function.get_generic_params (), + ConstGenericCtx::Function); + for (auto ¶m : function.get_function_params ()) param.get_type ()->accept_vis (*this); @@ -571,18 +635,27 @@ ConstChecker::visit (Function &function) void ConstChecker::visit (TypeAlias &type_alias) -{} +{ + check_default_const_generics (type_alias.get_generic_params (), + ConstGenericCtx::TypeAlias); +} void ConstChecker::visit (StructStruct &struct_item) -{} +{ + check_default_const_generics (struct_item.get_generic_params (), + ConstGenericCtx::Struct); +} void ConstChecker::visit (TupleStruct &tuple_struct) -{} +{ + check_default_const_generics (tuple_struct.get_generic_params (), + ConstGenericCtx::Struct); +} void -ConstChecker::visit (EnumItem &item) +ConstChecker::visit (EnumItem &enum_item) {} void @@ -605,11 +678,17 @@ ConstChecker::visit (EnumItemDiscriminant &item) void ConstChecker::visit (Enum &enum_item) -{} +{ + check_default_const_generics (enum_item.get_generic_params (), + ConstGenericCtx::Enum); +} void ConstChecker::visit (Union &union_item) -{} +{ + check_default_const_generics (union_item.get_generic_params (), + ConstGenericCtx::Union); +} void ConstChecker::visit (ConstantItem &const_item) @@ -652,6 +731,9 @@ ConstChecker::visit (TraitItemType &item) void ConstChecker::visit (Trait &trait) { + check_default_const_generics (trait.get_generic_params (), + ConstGenericCtx::Trait); + for (auto &item : trait.get_trait_items ()) item->accept_vis (*this); } @@ -659,6 +741,9 @@ ConstChecker::visit (Trait &trait) void ConstChecker::visit (ImplBlock &impl) { + check_default_const_generics (impl.get_generic_params (), + ConstGenericCtx::Impl); + for (auto &item : impl.get_impl_items ()) item->accept_vis (*this); } diff --git a/gcc/rust/checks/errors/rust-const-checker.h b/gcc/rust/checks/errors/rust-const-checker.h index 50838d18996..90b675b94b8 100644 --- a/gcc/rust/checks/errors/rust-const-checker.h +++ b/gcc/rust/checks/errors/rust-const-checker.h @@ -46,6 +46,31 @@ private: */ void check_function_call (HirId fn_id, Location locus); + /* All possible const contexts */ + enum class ConstGenericCtx + { + Function, + TypeAlias, + Struct, + Enum, + Union, + Trait, + Impl + }; + + /* Get the string representation of a const context */ + const char *ctx_to_str (ConstGenericCtx ctx); + + /* Check if a const context allows default values */ + bool ctx_allows_default (ConstGenericCtx ctx); + + /** + * Check that const generic parameters only contains defaults in allowed + * contexts + */ + void check_default_const_generics ( + std::vector> ¶m, ConstGenericCtx context); + StackedContexts const_context; Resolver::Resolver &resolver; Analysis::Mappings &mappings; diff --git a/gcc/testsuite/rust/compile/const_generics_8.rs b/gcc/testsuite/rust/compile/const_generics_8.rs new file mode 100644 index 00000000000..b0bb2624a2c --- /dev/null +++ b/gcc/testsuite/rust/compile/const_generics_8.rs @@ -0,0 +1,12 @@ +struct Bidule {} +enum Bidoule {} + +// Note - missing generic parameter - needs name resolution on const generics +type Bipboupe = Bidule; +trait Fooable {} + +union Bidoulepe {} // { dg-error "default values for const generic parameters are not allowed in .union. items" } +fn const_default() {} // { dg-error "default values for const generic parameters are not allowed in .function. items" } + +// Note - missing generic parameter - needs name resolution on const generics +impl Bidule {} // { dg-error "default values for const generic parameters are not allowed in .impl. items" }