From patchwork Tue Dec 6 10:14:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arthur Cohen X-Patchwork-Id: 61518 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 89DA1384C92A for ; Tue, 6 Dec 2022 10:20:27 +0000 (GMT) X-Original-To: gcc-patches@gcc.gnu.org Delivered-To: gcc-patches@gcc.gnu.org Received: from mail-wr1-x42b.google.com (mail-wr1-x42b.google.com [IPv6:2a00:1450:4864:20::42b]) by sourceware.org (Postfix) with ESMTPS id 0666F398241B for ; Tue, 6 Dec 2022 10:12:35 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 0666F398241B Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=embecosm.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=embecosm.com Received: by mail-wr1-x42b.google.com with SMTP id u12so21781541wrr.11 for ; Tue, 06 Dec 2022 02:12:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=embecosm.com; s=google; h=content-transfer-encoding:mime-version:reply-to:references :in-reply-to:message-id:date:subject:cc:to:from:from:to:cc:subject :date:message-id:reply-to; bh=5dqv9VmA0LkRC9pt8vZVytOE1Tu+nwec/GrX+KwA0yY=; b=TXoyIYMhqEHARPLV7ZZ2UAep6rsCqon9WMO6vUPWdKCbUjcw/SFVT0ddjYo5GUGQV+ A7/4c1Uz4r9UXGG2gAPOc6py/s0UN6DCC7MFMnlN8CcTfYVn575zYE45me/6h3/QHD+K lk8J4YI/hXmMXVmRRZgWeDV7rAH2Wzxvoc4iuE7YFN90hZiJxtt2cHCIq28daebYjBW4 elCdHvyGYqQkrK9Mky8fX6VSdjVcnG6UBBvVHROz65Jk/+0ntUlqPHUzY+HXw5M0dkuk qqs74tI+xrSwPkmS/hGkUA/c2mPNf0tznS4DUq2lmquoTjxCi2pNJZNhiF40tiIcmwl6 QvAQ== 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:subject:date:message-id:reply-to; bh=5dqv9VmA0LkRC9pt8vZVytOE1Tu+nwec/GrX+KwA0yY=; b=bjSLUoYYFRDKxAdUtwwCxC6Rh/Rq+kGLdnpYfXF5KM4UM2K169Y7Db8nrvTO0RuJFH XTzTpd19Epksm8JY4cUypKgiowjGipsfh96t+qjeYzqWH0fcteGEpIhG7LGdBTzogywI osY8HfdBckHFX/tbH/uev/nC7ORkE9btEF7axhTPHWfXK1u4Ok7p7wtVtJryMEO11Ai1 iWUNJKss263UJqLo5w9fLNnK1D5Pu40eMlqNWT4KWCM/xTR7Nz88YjFXuMXSyrcq/uje Jzqu//y+RiTSYrJkWJDN21of8nELH3IPJtNdOyp4Mv4NdVf+RsjkVUwufi3y9xUaOOd5 BI+w== X-Gm-Message-State: ANoB5pk8T5OxmrqdZQFmQnmdS9KIkPJSoiSWVaAEoSABjW5a3BQ7sdRF zjgKgBIixBJbI1DCFsep6TfmiBPIUbxn/YDZgA== X-Google-Smtp-Source: AA0mqf4EJ8L31Xcq6bYOpgX9tQG41lycLF9qCv6Nm8DPKeFc+wIhbFieY1RB67Vowb3bh8S9Qh5+CA== X-Received: by 2002:adf:f94f:0:b0:241:f467:f885 with SMTP id q15-20020adff94f000000b00241f467f885mr36984046wrr.482.1670321554018; Tue, 06 Dec 2022 02:12:34 -0800 (PST) Received: from platypus.lan ([2001:861:5e4c:3bb0:6424:328a:1734:3249]) by smtp.googlemail.com with ESMTPSA id r10-20020a05600c458a00b003cfd4a50d5asm27052699wmo.34.2022.12.06.02.12.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Dec 2022 02:12:33 -0800 (PST) From: arthur.cohen@embecosm.com To: gcc-patches@gcc.gnu.org Cc: gcc-rust@gcc.gnu.org, Arthur Cohen Subject: [PATCH Rust front-end v4 31/46] gccrs: Add const checker Date: Tue, 6 Dec 2022 11:14:03 +0100 Message-Id: <20221206101417.778807-32-arthur.cohen@embecosm.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221206101417.778807-1-arthur.cohen@embecosm.com> References: <20221206101417.778807-1-arthur.cohen@embecosm.com> MIME-Version: 1.0 X-Spam-Status: No, score=-18.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP 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: arthur.cohen@embecosm.com 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 */