From patchwork Wed Aug 24 11:59:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: herron.philip@googlemail.com X-Patchwork-Id: 57001 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 4F79A3989FF8 for ; Wed, 24 Aug 2022 12:07:20 +0000 (GMT) X-Original-To: gcc-patches@gcc.gnu.org Delivered-To: gcc-patches@gcc.gnu.org Received: from mail-wm1-x32d.google.com (mail-wm1-x32d.google.com [IPv6:2a00:1450:4864:20::32d]) by sourceware.org (Postfix) with ESMTPS id B50F5380DFA2; Wed, 24 Aug 2022 12:01:06 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org B50F5380DFA2 Authentication-Results: sourceware.org; dmarc=pass (p=quarantine dis=none) header.from=googlemail.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=googlemail.com Received: by mail-wm1-x32d.google.com with SMTP id k17so8662568wmr.2; Wed, 24 Aug 2022 05:01:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20210112; h=content-transfer-encoding:mime-version:reply-to:references :in-reply-to:message-id:date:subject:cc:to:from:from:to:cc; bh=yRBPc9YdpJc/UbKOxruyWWT3R50qmn9olUn7RiM9JYw=; b=Fyi04gwq2A/fIQPlRNli4KSiDaOknOnPk1NcyWWWk0lVd4JFVyDue66nBcny0/ufuR SrG8sfo0nwRdH88Z0goJR/LiE5tBWmKQWI4LK7HnFV9S7PuiyABDgG/dskH5PEjOuLSC AVr0M0oR6G1QiJfJ0TuldaeH/oTbC3LexmVVbfv66NuiKsoXOYLmHVASbQDvAIAJa+QS H3gZyQFm/LkOlpYYT602uQsqpECIpXDMxSAuJfi8W2JM8mM+hjN3FjipkQ+8JEKi11p+ SwV3R/CQCSEwwhjNGr7nqSafdy6Rp9oAnESMMe79C/zjX/STCyxyu2SrHkSeoIsKan8g q++g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:reply-to:references :in-reply-to:message-id:date:subject:cc:to:from:x-gm-message-state :from:to:cc; bh=yRBPc9YdpJc/UbKOxruyWWT3R50qmn9olUn7RiM9JYw=; b=dCQZN2D8hitUpKM7/MjGrE65fM0yMPb73rcPIUk6yDwOKWTYDxzwRXWxJptbe2E3ey wWY0ENGEnkCZiaf+itKbanz6yCNiGCK64KtlC2c2ICpZ8fJWiVUM1K/6Zmvx6qQLrFbC VDh1BY6ENhHEXiGIL1IGx3JssoNh/Cae+DJbfxz+OaTFF+xbup911Qu1ihIPrGytPxM+ m7w8C8Hq3Y1w9QhPIw76NJWw33LC/jQ5KYQx63tYvR4k6ElRF7JSLqWo3LJhkNPbhzVs S9wCRGS3YkTBdW1vyrjR+PJEpcOF3zlSw/DM8IuZHr5KfGGJCoVEuCfVf7AtSgSzKsf/ M1KA== X-Gm-Message-State: ACgBeo3NuCNkqk1jRxGHT2+Mn2lnCvRfdC73zwp9dzRHcEmi77ohfuAo sSdn3cEqwGL9pcKygJIrvuK7LM23Nw8= X-Google-Smtp-Source: AA6agR5lbpPnJmmgWWHcjdPle4wb9/qE8iWenaQPJB4kvxlonDERme2lQSI1qZKxLCjx3/7eyUZEvg== X-Received: by 2002:a05:600c:4e92:b0:3a5:fd90:24e3 with SMTP id f18-20020a05600c4e9200b003a5fd9024e3mr5200587wmq.59.1661342465029; Wed, 24 Aug 2022 05:01:05 -0700 (PDT) Received: from localhost.localdomain ([86.14.124.218]) by smtp.gmail.com with ESMTPSA id cc19-20020a5d5c13000000b0022571d43d32sm1697676wrb.21.2022.08.24.05.01.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Aug 2022 05:01:03 -0700 (PDT) From: herron.philip@googlemail.com X-Google-Original-From: philip.herron@embecosm.com To: gcc-patches@gcc.gnu.org Subject: [PATCH Rust front-end v2 24/37] gccrs: Add const checker Date: Wed, 24 Aug 2022 12:59:43 +0100 Message-Id: <20220824115956.737931-25-philip.herron@embecosm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220824115956.737931-1-philip.herron@embecosm.com> References: <20220824115956.737931-1-philip.herron@embecosm.com> MIME-Version: 1.0 X-Spam-Status: No, score=-11.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: philip.herron@embecosm.com Cc: Arthur Cohen , gcc-rust@gcc.gnu.org Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org Sender: "Gcc-patches" From: Arthur Cohen Similarly to the unsafe checker, constant evaluation can only be performed in a few contexts and include restrictions on the Rust language. Should the user fail to uphold those conditions, errors will be reported and the compilation pipeline interrupted. These contexts are as follow: - Array type length expressions - Array repeat length expressions - Constants - Statics - Enum discriminants - Const generic arguments In these contexts, the user is restricted to calling only functions marked as `const` or perform arithmetic operations only on certain types, among other restrictions. --- gcc/rust/checks/errors/rust-const-checker.cc | 844 +++++++++++++++++++ gcc/rust/checks/errors/rust-const-checker.h | 189 +++++ 2 files changed, 1033 insertions(+) create mode 100644 gcc/rust/checks/errors/rust-const-checker.cc create mode 100644 gcc/rust/checks/errors/rust-const-checker.h diff --git a/gcc/rust/checks/errors/rust-const-checker.cc b/gcc/rust/checks/errors/rust-const-checker.cc new file mode 100644 index 00000000000..35c61fe03f0 --- /dev/null +++ b/gcc/rust/checks/errors/rust-const-checker.cc @@ -0,0 +1,844 @@ +// Copyright (C) 2020-2022 Free Software Foundation, Inc. + +// This file is part of GCC. + +// GCC is free software; you can redistribute it and/or modify it under +// the terms of the GNU General Public License as published by the Free +// Software Foundation; either version 3, or (at your option) any later +// version. + +// GCC is distributed in the hope that it will be useful, but WITHOUT ANY +// WARRANTY; without even the implied warranty of MERCHANTABILITY or +// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +// for more details. + +// You should have received a copy of the GNU General Public License +// along with GCC; see the file COPYING3. If not see +// . + +#include "rust-const-checker.h" +#include "rust-hir.h" +#include "rust-hir-expr.h" +#include "rust-hir-stmt.h" +#include "rust-hir-item.h" + +namespace Rust { +namespace HIR { + +ConstChecker::ConstChecker () + : resolver (*Resolver::Resolver::get ()), + mappings (*Analysis::Mappings::get ()) +{} + +void +ConstChecker::go (HIR::Crate &crate) +{ + for (auto &item : crate.items) + item->accept_vis (*this); +} + +bool +ConstChecker::is_const_extern_fn (HIR::ExternalFunctionItem &fn) +{ + // FIXME: Is it really how we want to handle `rustc_const_stable` + // and `rustc_const_unstable`? + // TODO: Add these attributes to the attribute check and handle + // `stable` and `unstable` as well + return std::any_of ( + fn.get_outer_attrs ().begin (), fn.get_outer_attrs ().end (), + [] (const AST::Attribute &attr) { + // `starts_with` in C++11... + return attr.get_path ().as_string ().rfind ("rustc_const_", 0) == 0; + }); +} + +void +ConstChecker::visit (Lifetime &lifetime) +{} + +void +ConstChecker::visit (LifetimeParam &lifetime_param) +{} + +void +ConstChecker::visit (PathInExpression &path) +{} + +void +ConstChecker::visit (TypePathSegment &segment) +{} + +void +ConstChecker::visit (TypePathSegmentGeneric &segment) +{} + +void +ConstChecker::visit (TypePathSegmentFunction &segment) +{} + +void +ConstChecker::visit (TypePath &path) +{} + +void +ConstChecker::visit (QualifiedPathInExpression &path) +{} + +void +ConstChecker::visit (QualifiedPathInType &path) +{} + +void +ConstChecker::visit (LiteralExpr &expr) +{} + +void +ConstChecker::visit (BorrowExpr &expr) +{ + expr.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (DereferenceExpr &expr) +{ + expr.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (ErrorPropagationExpr &expr) +{ + expr.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (NegationExpr &expr) +{ + expr.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (ArithmeticOrLogicalExpr &expr) +{ + expr.get_lhs ()->accept_vis (*this); + expr.get_rhs ()->accept_vis (*this); +} + +void +ConstChecker::visit (ComparisonExpr &expr) +{ + expr.get_lhs ()->accept_vis (*this); + expr.get_rhs ()->accept_vis (*this); +} + +void +ConstChecker::visit (LazyBooleanExpr &expr) +{ + expr.get_lhs ()->accept_vis (*this); + expr.get_rhs ()->accept_vis (*this); +} + +void +ConstChecker::visit (TypeCastExpr &expr) +{ + expr.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (AssignmentExpr &expr) +{ + expr.get_lhs ()->accept_vis (*this); + expr.get_rhs ()->accept_vis (*this); +} + +void +ConstChecker::visit (CompoundAssignmentExpr &expr) +{ + expr.get_left_expr ()->accept_vis (*this); + expr.get_right_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (GroupedExpr &expr) +{ + expr.get_expr_in_parens ()->accept_vis (*this); +} + +void +ConstChecker::visit (ArrayElemsValues &elems) +{ + for (auto &elem : elems.get_values ()) + elem->accept_vis (*this); +} + +void +ConstChecker::visit (ArrayElemsCopied &elems) +{ + elems.get_elem_to_copy ()->accept_vis (*this); + + const_context.enter (elems.get_mappings ().get_hirid ()); + + elems.get_num_copies_expr ()->accept_vis (*this); + + const_context.exit (); +} + +void +ConstChecker::visit (ArrayExpr &expr) +{ + expr.get_internal_elements ()->accept_vis (*this); +} + +void +ConstChecker::visit (ArrayIndexExpr &expr) +{ + expr.get_array_expr ()->accept_vis (*this); + expr.get_index_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (TupleExpr &expr) +{ + for (auto &elem : expr.get_tuple_elems ()) + elem->accept_vis (*this); +} + +void +ConstChecker::visit (TupleIndexExpr &expr) +{ + expr.get_tuple_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (StructExprStruct &expr) +{} + +void +ConstChecker::visit (StructExprFieldIdentifier &field) +{} + +void +ConstChecker::visit (StructExprFieldIdentifierValue &field) +{ + field.get_value ()->accept_vis (*this); +} + +void +ConstChecker::visit (StructExprFieldIndexValue &field) +{ + field.get_value ()->accept_vis (*this); +} + +void +ConstChecker::visit (StructExprStructFields &expr) +{ + for (auto &field : expr.get_fields ()) + field->accept_vis (*this); +} + +void +ConstChecker::visit (StructExprStructBase &expr) +{} + +void +ConstChecker::check_function_call (HirId fn_id, Location locus) +{ + if (!const_context.is_in_context ()) + return; + + auto maybe_fn = mappings.lookup_hir_item (fn_id); + if (maybe_fn && maybe_fn->get_item_kind () != Item::ItemKind::Function) + return; + + // There are const extern functions (intrinsics) + // TODO: Should we check the ABI is only "rust intrinsics"? Is that handled + // elsewhere? + HirId parent_block; + auto maybe_extern_item + = mappings.lookup_hir_extern_item (fn_id, &parent_block); + if (maybe_extern_item + && maybe_extern_item->get_extern_kind () + != ExternalItem::ExternKind::Function) + return; + + auto is_error = false; + if (maybe_fn) + { + auto fn = static_cast (maybe_fn); + if (!fn->get_qualifiers ().is_const ()) + is_error = true; + } + + if (maybe_extern_item) + { + { + auto fn = static_cast (maybe_extern_item); + if (!is_const_extern_fn (*fn)) + is_error = true; + } + } + + if (is_error) + rust_error_at (locus, "only functions marked as % are allowed to " + "be called from constant contexts"); +} + +void +ConstChecker::visit (CallExpr &expr) +{ + auto fn = expr.get_fnexpr (); + if (!fn) + return; + + NodeId ast_node_id = fn->get_mappings ().get_nodeid (); + NodeId ref_node_id; + HirId definition_id; + + // We don't care about types here + if (!resolver.lookup_resolved_name (ast_node_id, &ref_node_id)) + return; + + rust_assert (mappings.lookup_node_to_hir (ref_node_id, &definition_id)); + + check_function_call (definition_id, expr.get_locus ()); + + for (auto &arg : expr.get_arguments ()) + arg->accept_vis (*this); +} + +void +ConstChecker::visit (MethodCallExpr &expr) +{ + expr.get_receiver ()->accept_vis (*this); + + for (auto &arg : expr.get_arguments ()) + arg->accept_vis (*this); +} + +void +ConstChecker::visit (FieldAccessExpr &expr) +{ + expr.get_receiver_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (ClosureExprInner &expr) +{} + +void +ConstChecker::visit (BlockExpr &expr) +{ + for (auto &stmt : expr.get_statements ()) + stmt->accept_vis (*this); + + if (expr.has_expr ()) + expr.get_final_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (ClosureExprInnerTyped &expr) +{} + +void +ConstChecker::visit (ContinueExpr &expr) +{} + +void +ConstChecker::visit (BreakExpr &expr) +{ + if (expr.has_break_expr ()) + expr.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (RangeFromToExpr &expr) +{ + expr.get_from_expr ()->accept_vis (*this); + expr.get_to_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (RangeFromExpr &expr) +{ + expr.get_from_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (RangeToExpr &expr) +{ + expr.get_to_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (RangeFullExpr &expr) +{} + +void +ConstChecker::visit (RangeFromToInclExpr &expr) +{ + expr.get_from_expr ()->accept_vis (*this); + expr.get_to_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (RangeToInclExpr &expr) +{ + // FIXME: Visit to_expr +} + +void +ConstChecker::visit (ReturnExpr &expr) +{ + if (expr.has_return_expr ()) + expr.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (UnsafeBlockExpr &expr) +{ + expr.get_block_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (LoopExpr &expr) +{ + expr.get_loop_block ()->accept_vis (*this); +} + +void +ConstChecker::visit (WhileLoopExpr &expr) +{ + expr.get_predicate_expr ()->accept_vis (*this); + expr.get_loop_block ()->accept_vis (*this); +} + +void +ConstChecker::visit (WhileLetLoopExpr &expr) +{ + expr.get_cond ()->accept_vis (*this); + expr.get_loop_block ()->accept_vis (*this); +} + +void +ConstChecker::visit (ForLoopExpr &expr) +{ + expr.get_iterator_expr ()->accept_vis (*this); + expr.get_loop_block ()->accept_vis (*this); +} + +void +ConstChecker::visit (IfExpr &expr) +{ + expr.get_if_condition ()->accept_vis (*this); + expr.get_if_block ()->accept_vis (*this); +} + +void +ConstChecker::visit (IfExprConseqElse &expr) +{ + expr.get_if_condition ()->accept_vis (*this); + expr.get_if_block ()->accept_vis (*this); + expr.get_else_block ()->accept_vis (*this); +} + +void +ConstChecker::visit (IfExprConseqIf &expr) +{ + expr.get_if_condition ()->accept_vis (*this); + expr.get_if_block ()->accept_vis (*this); + expr.get_conseq_if_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (IfExprConseqIfLet &expr) +{ + expr.get_if_condition ()->accept_vis (*this); + expr.get_if_block ()->accept_vis (*this); + + // TODO: Visit conseq if let expression +} + +void +ConstChecker::visit (IfLetExpr &expr) +{ + expr.get_scrutinee_expr ()->accept_vis (*this); + expr.get_if_block ()->accept_vis (*this); +} + +void +ConstChecker::visit (IfLetExprConseqElse &expr) +{ + expr.get_scrutinee_expr ()->accept_vis (*this); + expr.get_if_block ()->accept_vis (*this); + + // TODO: Visit else expression +} + +void +ConstChecker::visit (IfLetExprConseqIf &expr) +{ + expr.get_scrutinee_expr ()->accept_vis (*this); + expr.get_if_block ()->accept_vis (*this); +} + +void +ConstChecker::visit (IfLetExprConseqIfLet &expr) +{ + expr.get_scrutinee_expr ()->accept_vis (*this); + expr.get_if_block ()->accept_vis (*this); + + // TODO: Visit conseq if let expression +} + +void +ConstChecker::visit (MatchExpr &expr) +{ + expr.get_scrutinee_expr ()->accept_vis (*this); + + for (auto &match_arm : expr.get_match_cases ()) + match_arm.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (AwaitExpr &expr) +{ + // TODO: Visit expression +} + +void +ConstChecker::visit (AsyncBlockExpr &expr) +{ + // TODO: Visit block expression +} + +void +ConstChecker::visit (TypeParam ¶m) +{} + +void +ConstChecker::visit (ConstGenericParam ¶m) +{} + +void +ConstChecker::visit (LifetimeWhereClauseItem &item) +{} + +void +ConstChecker::visit (TypeBoundWhereClauseItem &item) +{} + +void +ConstChecker::visit (Module &module) +{ + for (auto &item : module.get_items ()) + item->accept_vis (*this); +} + +void +ConstChecker::visit (ExternCrate &crate) +{} + +void +ConstChecker::visit (UseTreeGlob &use_tree) +{} + +void +ConstChecker::visit (UseTreeList &use_tree) +{} + +void +ConstChecker::visit (UseTreeRebind &use_tree) +{} + +void +ConstChecker::visit (UseDeclaration &use_decl) +{} + +void +ConstChecker::visit (Function &function) +{ + auto const_fn = function.get_qualifiers ().is_const (); + if (const_fn) + const_context.enter (function.get_mappings ().get_hirid ()); + + for (auto ¶m : function.get_function_params ()) + param.get_type ()->accept_vis (*this); + + function.get_definition ()->accept_vis (*this); + + if (const_fn) + const_context.exit (); +} + +void +ConstChecker::visit (TypeAlias &type_alias) +{} + +void +ConstChecker::visit (StructStruct &struct_item) +{} + +void +ConstChecker::visit (TupleStruct &tuple_struct) +{} + +void +ConstChecker::visit (EnumItem &item) +{} + +void +ConstChecker::visit (EnumItemTuple &item) +{} + +void +ConstChecker::visit (EnumItemStruct &item) +{} + +void +ConstChecker::visit (EnumItemDiscriminant &item) +{ + const_context.enter (item.get_mappings ().get_hirid ()); + + item.get_discriminant_expression ()->accept_vis (*this); + + const_context.exit (); +} + +void +ConstChecker::visit (Enum &enum_item) +{} + +void +ConstChecker::visit (Union &union_item) +{} + +void +ConstChecker::visit (ConstantItem &const_item) +{ + const_context.enter (const_item.get_mappings ().get_hirid ()); + + const_item.get_expr ()->accept_vis (*this); + + const_context.exit (); +} + +void +ConstChecker::visit (StaticItem &static_item) +{ + const_context.enter (static_item.get_mappings ().get_hirid ()); + + static_item.get_expr ()->accept_vis (*this); + + const_context.exit (); +} + +void +ConstChecker::visit (TraitItemFunc &item) +{ + if (item.has_block_defined ()) + item.get_block_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (TraitItemConst &item) +{ + if (item.has_expr ()) + item.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (TraitItemType &item) +{} + +void +ConstChecker::visit (Trait &trait) +{ + for (auto &item : trait.get_trait_items ()) + item->accept_vis (*this); +} + +void +ConstChecker::visit (ImplBlock &impl) +{ + for (auto &item : impl.get_impl_items ()) + item->accept_vis (*this); +} + +void +ConstChecker::visit (ExternalStaticItem &item) +{} + +void +ConstChecker::visit (ExternalFunctionItem &item) +{} + +void +ConstChecker::visit (ExternBlock &block) +{ + // FIXME: Do we need to do this? + for (auto &item : block.get_extern_items ()) + item->accept_vis (*this); +} + +void +ConstChecker::visit (LiteralPattern &pattern) +{} + +void +ConstChecker::visit (IdentifierPattern &pattern) +{} + +void +ConstChecker::visit (WildcardPattern &pattern) +{} + +void +ConstChecker::visit (RangePatternBoundLiteral &bound) +{} + +void +ConstChecker::visit (RangePatternBoundPath &bound) +{} + +void +ConstChecker::visit (RangePatternBoundQualPath &bound) +{} + +void +ConstChecker::visit (RangePattern &pattern) +{} + +void +ConstChecker::visit (ReferencePattern &pattern) +{} + +void +ConstChecker::visit (StructPatternFieldTuplePat &field) +{} + +void +ConstChecker::visit (StructPatternFieldIdentPat &field) +{} + +void +ConstChecker::visit (StructPatternFieldIdent &field) +{} + +void +ConstChecker::visit (StructPattern &pattern) +{} + +void +ConstChecker::visit (TupleStructItemsNoRange &tuple_items) +{} + +void +ConstChecker::visit (TupleStructItemsRange &tuple_items) +{} + +void +ConstChecker::visit (TupleStructPattern &pattern) +{} + +void +ConstChecker::visit (TuplePatternItemsMultiple &tuple_items) +{} + +void +ConstChecker::visit (TuplePatternItemsRanged &tuple_items) +{} + +void +ConstChecker::visit (TuplePattern &pattern) +{} + +void +ConstChecker::visit (GroupedPattern &pattern) +{} + +void +ConstChecker::visit (SlicePattern &pattern) +{} + +void +ConstChecker::visit (EmptyStmt &stmt) +{} + +void +ConstChecker::visit (LetStmt &stmt) +{ + if (stmt.has_init_expr ()) + stmt.get_init_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (ExprStmtWithoutBlock &stmt) +{ + stmt.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (ExprStmtWithBlock &stmt) +{ + stmt.get_expr ()->accept_vis (*this); +} + +void +ConstChecker::visit (TraitBound &bound) +{} + +void +ConstChecker::visit (ImplTraitType &type) +{} + +void +ConstChecker::visit (TraitObjectType &type) +{} + +void +ConstChecker::visit (ParenthesisedType &type) +{} + +void +ConstChecker::visit (ImplTraitTypeOneBound &type) +{} + +void +ConstChecker::visit (TupleType &type) +{} + +void +ConstChecker::visit (NeverType &type) +{} + +void +ConstChecker::visit (RawPointerType &type) +{} + +void +ConstChecker::visit (ReferenceType &type) +{} + +void +ConstChecker::visit (ArrayType &type) +{ + const_context.enter (type.get_mappings ().get_hirid ()); + + type.get_size_expr ()->accept_vis (*this); + + const_context.exit (); +} + +void +ConstChecker::visit (SliceType &type) +{} + +void +ConstChecker::visit (InferredType &type) +{} + +void +ConstChecker::visit (BareFunctionType &type) +{} + +} // namespace HIR +} // namespace Rust diff --git a/gcc/rust/checks/errors/rust-const-checker.h b/gcc/rust/checks/errors/rust-const-checker.h new file mode 100644 index 00000000000..50838d18996 --- /dev/null +++ b/gcc/rust/checks/errors/rust-const-checker.h @@ -0,0 +1,189 @@ +// Copyright (C) 2020-2022 Free Software Foundation, Inc. + +// This file is part of GCC. + +// GCC is free software; you can redistribute it and/or modify it under +// the terms of the GNU General Public License as published by the Free +// Software Foundation; either version 3, or (at your option) any later +// version. + +// GCC is distributed in the hope that it will be useful, but WITHOUT ANY +// WARRANTY; without even the implied warranty of MERCHANTABILITY or +// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +// for more details. + +// You should have received a copy of the GNU General Public License +// along with GCC; see the file COPYING3. If not see +// . + +#ifndef RUST_CONST_CHECKER_H +#define RUST_CONST_CHECKER_H + +#include "rust-hir-visitor.h" +#include "rust-hir-type-check.h" +#include "rust-stacked-contexts.h" +#include "rust-name-resolver.h" + +namespace Rust { +namespace HIR { +class ConstChecker : public HIRFullVisitor +{ +public: + ConstChecker (); + + void go (HIR::Crate &crate); + + /** + * Check if an item is a const extern item or not + * TODO: Move this to a const compilation context class or an attribute + * checking class + */ + static bool is_const_extern_fn (HIR::ExternalFunctionItem &fn); + +private: + /** + * Check that only const functions are called in const contexts + */ + void check_function_call (HirId fn_id, Location locus); + + StackedContexts const_context; + Resolver::Resolver &resolver; + Analysis::Mappings &mappings; + + virtual void visit (Lifetime &lifetime) override; + virtual void visit (LifetimeParam &lifetime_param) override; + virtual void visit (PathInExpression &path) override; + virtual void visit (TypePathSegment &segment) override; + virtual void visit (TypePathSegmentGeneric &segment) override; + virtual void visit (TypePathSegmentFunction &segment) override; + virtual void visit (TypePath &path) override; + virtual void visit (QualifiedPathInExpression &path) override; + virtual void visit (QualifiedPathInType &path) override; + virtual void visit (LiteralExpr &expr) override; + virtual void visit (BorrowExpr &expr) override; + virtual void visit (DereferenceExpr &expr) override; + virtual void visit (ErrorPropagationExpr &expr) override; + virtual void visit (NegationExpr &expr) override; + virtual void visit (ArithmeticOrLogicalExpr &expr) override; + virtual void visit (ComparisonExpr &expr) override; + virtual void visit (LazyBooleanExpr &expr) override; + virtual void visit (TypeCastExpr &expr) override; + virtual void visit (AssignmentExpr &expr) override; + virtual void visit (CompoundAssignmentExpr &expr) override; + virtual void visit (GroupedExpr &expr) override; + virtual void visit (ArrayElemsValues &elems) override; + virtual void visit (ArrayElemsCopied &elems) override; + virtual void visit (ArrayExpr &expr) override; + virtual void visit (ArrayIndexExpr &expr) override; + virtual void visit (TupleExpr &expr) override; + virtual void visit (TupleIndexExpr &expr) override; + virtual void visit (StructExprStruct &expr) override; + virtual void visit (StructExprFieldIdentifier &field) override; + virtual void visit (StructExprFieldIdentifierValue &field) override; + virtual void visit (StructExprFieldIndexValue &field) override; + virtual void visit (StructExprStructFields &expr) override; + virtual void visit (StructExprStructBase &expr) override; + virtual void visit (CallExpr &expr) override; + virtual void visit (MethodCallExpr &expr) override; + virtual void visit (FieldAccessExpr &expr) override; + virtual void visit (ClosureExprInner &expr) override; + virtual void visit (BlockExpr &expr) override; + virtual void visit (ClosureExprInnerTyped &expr) override; + virtual void visit (ContinueExpr &expr) override; + virtual void visit (BreakExpr &expr) override; + virtual void visit (RangeFromToExpr &expr) override; + virtual void visit (RangeFromExpr &expr) override; + virtual void visit (RangeToExpr &expr) override; + virtual void visit (RangeFullExpr &expr) override; + virtual void visit (RangeFromToInclExpr &expr) override; + virtual void visit (RangeToInclExpr &expr) override; + virtual void visit (ReturnExpr &expr) override; + virtual void visit (UnsafeBlockExpr &expr) override; + virtual void visit (LoopExpr &expr) override; + virtual void visit (WhileLoopExpr &expr) override; + virtual void visit (WhileLetLoopExpr &expr) override; + virtual void visit (ForLoopExpr &expr) override; + virtual void visit (IfExpr &expr) override; + virtual void visit (IfExprConseqElse &expr) override; + virtual void visit (IfExprConseqIf &expr) override; + virtual void visit (IfExprConseqIfLet &expr) override; + virtual void visit (IfLetExpr &expr) override; + virtual void visit (IfLetExprConseqElse &expr) override; + virtual void visit (IfLetExprConseqIf &expr) override; + virtual void visit (IfLetExprConseqIfLet &expr) override; + virtual void visit (MatchExpr &expr) override; + virtual void visit (AwaitExpr &expr) override; + virtual void visit (AsyncBlockExpr &expr) override; + virtual void visit (TypeParam ¶m) override; + virtual void visit (ConstGenericParam ¶m) override; + virtual void visit (LifetimeWhereClauseItem &item) override; + virtual void visit (TypeBoundWhereClauseItem &item) override; + virtual void visit (Module &module) override; + virtual void visit (ExternCrate &crate) override; + virtual void visit (UseTreeGlob &use_tree) override; + virtual void visit (UseTreeList &use_tree) override; + virtual void visit (UseTreeRebind &use_tree) override; + virtual void visit (UseDeclaration &use_decl) override; + virtual void visit (Function &function) override; + virtual void visit (TypeAlias &type_alias) override; + virtual void visit (StructStruct &struct_item) override; + virtual void visit (TupleStruct &tuple_struct) override; + virtual void visit (EnumItem &item) override; + virtual void visit (EnumItemTuple &item) override; + virtual void visit (EnumItemStruct &item) override; + virtual void visit (EnumItemDiscriminant &item) override; + virtual void visit (Enum &enum_item) override; + virtual void visit (Union &union_item) override; + virtual void visit (ConstantItem &const_item) override; + virtual void visit (StaticItem &static_item) override; + virtual void visit (TraitItemFunc &item) override; + virtual void visit (TraitItemConst &item) override; + virtual void visit (TraitItemType &item) override; + virtual void visit (Trait &trait) override; + virtual void visit (ImplBlock &impl) override; + virtual void visit (ExternalStaticItem &item) override; + virtual void visit (ExternalFunctionItem &item) override; + virtual void visit (ExternBlock &block) override; + virtual void visit (LiteralPattern &pattern) override; + virtual void visit (IdentifierPattern &pattern) override; + virtual void visit (WildcardPattern &pattern) override; + virtual void visit (RangePatternBoundLiteral &bound) override; + virtual void visit (RangePatternBoundPath &bound) override; + virtual void visit (RangePatternBoundQualPath &bound) override; + virtual void visit (RangePattern &pattern) override; + virtual void visit (ReferencePattern &pattern) override; + virtual void visit (StructPatternFieldTuplePat &field) override; + virtual void visit (StructPatternFieldIdentPat &field) override; + virtual void visit (StructPatternFieldIdent &field) override; + virtual void visit (StructPattern &pattern) override; + virtual void visit (TupleStructItemsNoRange &tuple_items) override; + virtual void visit (TupleStructItemsRange &tuple_items) override; + virtual void visit (TupleStructPattern &pattern) override; + virtual void visit (TuplePatternItemsMultiple &tuple_items) override; + virtual void visit (TuplePatternItemsRanged &tuple_items) override; + virtual void visit (TuplePattern &pattern) override; + virtual void visit (GroupedPattern &pattern) override; + virtual void visit (SlicePattern &pattern) override; + virtual void visit (EmptyStmt &stmt) override; + virtual void visit (LetStmt &stmt) override; + virtual void visit (ExprStmtWithoutBlock &stmt) override; + virtual void visit (ExprStmtWithBlock &stmt) override; + virtual void visit (TraitBound &bound) override; + virtual void visit (ImplTraitType &type) override; + virtual void visit (TraitObjectType &type) override; + virtual void visit (ParenthesisedType &type) override; + virtual void visit (ImplTraitTypeOneBound &type) override; + virtual void visit (TupleType &type) override; + virtual void visit (NeverType &type) override; + virtual void visit (RawPointerType &type) override; + virtual void visit (ReferenceType &type) override; + virtual void visit (ArrayType &type) override; + virtual void visit (SliceType &type) override; + virtual void visit (InferredType &type) override; + virtual void visit (BareFunctionType &type) override; +}; + +} // namespace HIR +} // namespace Rust + +#endif /* !RUST_CONST_CHECKER_H */