[1931bb01] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2018 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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[11df881] | 7 | // ReplaceTypedef.cpp -- Fill in all typedefs with the underlying type. |
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[1931bb01] | 8 | // |
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| 9 | // Author : Andrew Beach |
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| 10 | // Created On : Tue Jun 29 14:59:00 2022 |
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| 11 | // Last Modified By : Andrew Beach |
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[e9e9f56] | 12 | // Last Modified On : Tue Sep 20 17:00:00 2022 |
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| 13 | // Update Count : 2 |
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[1931bb01] | 14 | // |
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| 15 | |
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| 16 | #include "ReplaceTypedef.hpp" |
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| 17 | |
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| 18 | #include "AST/Pass.hpp" |
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| 19 | #include "Common/ScopedMap.h" |
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| 20 | #include "Common/UniqueName.h" |
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| 21 | #include "Common/utility.h" |
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| 22 | #include "ResolvExpr/typeops.h" |
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| 23 | |
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| 24 | namespace Validate { |
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| 25 | |
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| 26 | namespace { |
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| 27 | |
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| 28 | bool isNonParameterAttribute( ast::Attribute const * attr ) { |
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| 29 | static const std::vector<std::string> bad_names = { |
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| 30 | "aligned", "__aligned__", |
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| 31 | }; |
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| 32 | for ( auto name : bad_names ) { |
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| 33 | if ( name == attr->name ) { |
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| 34 | return true; |
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| 35 | } |
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| 36 | } |
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| 37 | return false; |
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| 38 | } |
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| 39 | |
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| 40 | struct ReplaceTypedefCore final : |
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[e9e9f56] | 41 | public ast::WithCodeLocation, |
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| 42 | public ast::WithDeclsToAdd<>, |
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[1931bb01] | 43 | public ast::WithGuards, |
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| 44 | public ast::WithShortCircuiting, |
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[e9e9f56] | 45 | public ast::WithVisitorRef<ReplaceTypedefCore> { |
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[1931bb01] | 46 | |
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| 47 | void previsit( ast::QualifiedType const * ); |
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| 48 | ast::Type const * postvisit( ast::QualifiedType const * ); |
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| 49 | ast::Type const * postvisit( ast::TypeInstType const * ); |
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| 50 | ast::Decl const * postvisit( ast::TypedefDecl const * ); |
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| 51 | void previsit( ast::TypeDecl const * ); |
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| 52 | void previsit( ast::FunctionDecl const * ); |
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| 53 | void previsit( ast::ObjectDecl const * ); |
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| 54 | ast::DeclWithType const * postvisit( ast::ObjectDecl const * ); |
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| 55 | |
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| 56 | void previsit( ast::CastExpr const * ); |
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| 57 | void previsit( ast::CompoundStmt const * ); |
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| 58 | void postvisit( ast::CompoundStmt const * ); |
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| 59 | |
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| 60 | ast::StructDecl const * previsit( ast::StructDecl const * ); |
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| 61 | ast::UnionDecl const * previsit( ast::UnionDecl const * ); |
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| 62 | void previsit( ast::EnumDecl const * ); |
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| 63 | void previsit( ast::TraitDecl const * ); |
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| 64 | |
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| 65 | template<typename AggrDecl> |
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| 66 | void addImplicitTypedef( AggrDecl * aggDecl ); |
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| 67 | template<typename AggrDecl> |
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| 68 | AggrDecl const * handleAggregate( AggrDecl const * aggDecl ); |
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| 69 | |
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| 70 | using TypedefDeclPtr = ast::ptr<ast::TypedefDecl>; |
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| 71 | using TypedefMap = ScopedMap<std::string, std::pair<TypedefDeclPtr, int>>; |
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| 72 | using TypeDeclMap = ScopedMap<std::string, ast::TypeDecl const *>; |
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| 73 | |
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| 74 | TypedefMap typedefNames; |
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| 75 | TypeDeclMap typedeclNames; |
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| 76 | int scopeLevel; |
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[af75a87] | 77 | bool isAtFunctionTop = false; |
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[1931bb01] | 78 | }; |
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| 79 | |
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| 80 | void ReplaceTypedefCore::previsit( ast::QualifiedType const * ) { |
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| 81 | visit_children = false; |
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| 82 | } |
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| 83 | |
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| 84 | ast::Type const * ReplaceTypedefCore::postvisit( |
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| 85 | ast::QualifiedType const * type ) { |
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| 86 | // Replacing typedefs only makes sense for the 'oldest ancestor' |
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| 87 | // of the qualified type. |
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| 88 | return ast::mutate_field( type, &ast::QualifiedType::parent, |
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| 89 | type->parent->accept( *visitor ) ); |
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| 90 | } |
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| 91 | |
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| 92 | ast::Type const * ReplaceTypedefCore::postvisit( |
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| 93 | ast::TypeInstType const * type ) { |
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| 94 | // Instances of typedef types will come here. If it is an instance |
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| 95 | // of a typedef type, link the instance to its actual type. |
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| 96 | TypedefMap::const_iterator def = typedefNames.find( type->name ); |
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| 97 | if ( def != typedefNames.end() ) { |
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| 98 | ast::Type * ret = ast::deepCopy( def->second.first->base ); |
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| 99 | ret->qualifiers |= type->qualifiers; |
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[af75a87] | 100 | // We ignore certain attributes on function parameters if they arrive |
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| 101 | // by typedef. GCC appears to do the same thing. |
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| 102 | if ( isAtFunctionTop ) { |
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[1931bb01] | 103 | erase_if( ret->attributes, isNonParameterAttribute ); |
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| 104 | } |
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| 105 | for ( const auto & attribute : type->attributes ) { |
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| 106 | ret->attributes.push_back( attribute ); |
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| 107 | } |
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| 108 | // Place instance parameters on the typedef'd type. |
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| 109 | if ( !type->params.empty() ) { |
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| 110 | auto rtt = dynamic_cast<ast::BaseInstType *>( ret ); |
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| 111 | if ( !rtt ) { |
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[e9e9f56] | 112 | assert( location ); |
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| 113 | SemanticError( *location, "Cannot apply type parameters to base type of " + type->name ); |
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[1931bb01] | 114 | } |
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| 115 | rtt->params.clear(); |
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| 116 | for ( auto it : type->params ) { |
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| 117 | rtt->params.push_back( ast::deepCopy( it ) ); |
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| 118 | } |
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| 119 | // Recursively fix typedefs on parameters. |
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| 120 | ast::mutate_each( rtt, &ast::BaseInstType::params, *visitor ); |
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| 121 | } |
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| 122 | return ret; |
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| 123 | } else { |
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| 124 | TypeDeclMap::const_iterator base = typedeclNames.find( type->name ); |
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| 125 | if ( base == typedeclNames.end() ) { |
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[e9e9f56] | 126 | assert( location ); |
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| 127 | SemanticError( *location, toString( "Use of undefined type ", type->name ) ); |
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[1931bb01] | 128 | } |
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| 129 | return ast::mutate_field( type, &ast::TypeInstType::base, base->second ); |
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| 130 | } |
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| 131 | } |
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| 132 | |
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| 133 | struct VarLenChecker : public ast::WithShortCircuiting { |
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| 134 | bool result = false; |
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| 135 | void previsit( ast::FunctionType const * ) { visit_children = false; } |
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| 136 | void previsit( ast::ArrayType const * at ) { result |= at->isVarLen; } |
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| 137 | }; |
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| 138 | |
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| 139 | ast::Decl const * ReplaceTypedefCore::postvisit( |
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| 140 | ast::TypedefDecl const * decl ) { |
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| 141 | if ( 1 == typedefNames.count( decl->name ) && |
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| 142 | typedefNames[ decl->name ].second == scopeLevel ) { |
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| 143 | ast::Type const * t0 = decl->base; |
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| 144 | ast::Type const * t1 = typedefNames[ decl->name ].first->base; |
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| 145 | // Cannot redefine VLA typedefs. Note: this is slightly incorrect, |
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| 146 | // because our notion of VLAs at this point in the translator is |
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| 147 | // imprecise. In particular, this will disallow redefining typedefs |
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| 148 | // with arrays whose dimension is an enumerator or a cast of a |
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| 149 | // constant/enumerator. The effort required to fix this corner case |
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| 150 | // likely outweighs the utility of allowing it. |
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| 151 | if ( !ResolvExpr::typesCompatible( t0, t1, ast::SymbolTable() ) |
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| 152 | || ast::Pass<VarLenChecker>::read( t0 ) |
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| 153 | || ast::Pass<VarLenChecker>::read( t1 ) ) { |
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| 154 | SemanticError( decl->location, "Cannot redefine typedef: " + decl->name ); |
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| 155 | } |
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| 156 | } else { |
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| 157 | typedefNames[ decl->name ] = |
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| 158 | std::make_pair( TypedefDeclPtr( decl ), scopeLevel ); |
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| 159 | } |
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| 160 | |
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| 161 | // When a typedef is a forward declaration: |
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| 162 | // > typedef struct screen SCREEN; |
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| 163 | // the declaration portion must be retained: |
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| 164 | // > struct screen; |
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| 165 | // because the expansion of the typedef is: |
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| 166 | // > void func( SCREEN * p ) -> void func( struct screen * p ); |
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| 167 | // hence type name "screen" must be defined. |
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| 168 | // Note: qualifiers on the typedef are not used for the forward declaration. |
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| 169 | |
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| 170 | ast::Type const * designatorType = decl->base->stripDeclarator(); |
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| 171 | if ( auto structType = dynamic_cast<ast::StructInstType const *>( designatorType ) ) { |
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| 172 | declsToAddBefore.push_back( new ast::StructDecl( |
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| 173 | decl->location, structType->name, ast::AggregateDecl::Struct, {}, |
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| 174 | decl->linkage ) ); |
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| 175 | } else if ( auto unionType = dynamic_cast<ast::UnionInstType const *>( designatorType ) ) { |
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| 176 | declsToAddBefore.push_back( new ast::UnionDecl( |
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| 177 | decl->location, unionType->name, {}, decl->linkage ) ); |
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| 178 | } else if ( auto enumType = dynamic_cast<ast::EnumInstType const *>( designatorType ) ) { |
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| 179 | declsToAddBefore.push_back( new ast::EnumDecl( |
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[b0d9ff7] | 180 | decl->location, enumType->name, false, {}, decl->linkage, |
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[1931bb01] | 181 | ( (enumType->base) ? enumType->base->base : nullptr ) |
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| 182 | ) ); |
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| 183 | } |
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| 184 | return ast::deepCopy( decl ); |
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| 185 | } |
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| 186 | |
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| 187 | void ReplaceTypedefCore::previsit( ast::TypeDecl const * decl ) { |
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| 188 | TypedefMap::iterator iter = typedefNames.find( decl->name ); |
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| 189 | if ( iter != typedefNames.end() ) { |
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| 190 | typedefNames.erase( iter ); |
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| 191 | } |
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| 192 | typedeclNames.insert( decl->name, decl ); |
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| 193 | } |
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| 194 | |
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| 195 | void ReplaceTypedefCore::previsit( ast::FunctionDecl const * decl ) { |
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| 196 | GuardScope( typedefNames ); |
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| 197 | GuardScope( typedeclNames ); |
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[af75a87] | 198 | GuardValue( isAtFunctionTop ) = true; |
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[1931bb01] | 199 | } |
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| 200 | |
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| 201 | void ReplaceTypedefCore::previsit( ast::ObjectDecl const * decl ) { |
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| 202 | GuardScope( typedefNames ); |
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| 203 | GuardScope( typedeclNames ); |
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| 204 | } |
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| 205 | |
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| 206 | ast::DeclWithType const * ReplaceTypedefCore::postvisit( |
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| 207 | ast::ObjectDecl const * decl ) { |
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| 208 | if ( ast::FunctionType const * type = decl->type.as<ast::FunctionType>() ) { |
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| 209 | using DWTVector = std::vector<ast::ptr<ast::DeclWithType>>; |
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| 210 | using DeclVector = std::vector<ast::ptr<ast::TypeDecl>>; |
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[e9e9f56] | 211 | CodeLocation const & declLocation = decl->location; |
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[1931bb01] | 212 | UniqueName paramNamer( decl->name + "Param" ); |
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| 213 | |
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| 214 | // Replace the current object declaration with a function declaration. |
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| 215 | ast::FunctionDecl const * newDecl = new ast::FunctionDecl( |
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[e9e9f56] | 216 | declLocation, |
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[1931bb01] | 217 | decl->name, |
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| 218 | map_range<DeclVector>( type->forall, []( const ast::TypeInstType * inst ) { |
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| 219 | return ast::deepCopy( inst->base ); |
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| 220 | } ), |
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| 221 | map_range<DWTVector>( type->assertions, []( const ast::VariableExpr * expr ) { |
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| 222 | return ast::deepCopy( expr->var ); |
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| 223 | } ), |
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[e9e9f56] | 224 | map_range<DWTVector>( type->params, [&declLocation, ¶mNamer]( const ast::Type * type ) { |
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[1931bb01] | 225 | assert( type ); |
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[e9e9f56] | 226 | return new ast::ObjectDecl( declLocation, paramNamer.newName(), ast::deepCopy( type ) ); |
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[1931bb01] | 227 | } ), |
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[e9e9f56] | 228 | map_range<DWTVector>( type->returns, [&declLocation, ¶mNamer]( const ast::Type * type ) { |
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[1931bb01] | 229 | assert( type ); |
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[e9e9f56] | 230 | return new ast::ObjectDecl( declLocation, paramNamer.newName(), ast::deepCopy( type ) ); |
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[1931bb01] | 231 | } ), |
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| 232 | nullptr, |
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| 233 | decl->storage, |
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| 234 | decl->linkage, |
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| 235 | {/* attributes */}, |
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| 236 | decl->funcSpec |
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| 237 | ); |
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| 238 | return newDecl; |
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| 239 | } |
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| 240 | return decl; |
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| 241 | } |
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| 242 | |
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| 243 | void ReplaceTypedefCore::previsit( ast::CastExpr const * expr ) { |
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| 244 | GuardScope( typedefNames ); |
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| 245 | GuardScope( typedeclNames ); |
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| 246 | } |
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| 247 | |
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| 248 | void ReplaceTypedefCore::previsit( ast::CompoundStmt const * expr ) { |
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| 249 | GuardScope( typedefNames ); |
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| 250 | GuardScope( typedeclNames ); |
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[af75a87] | 251 | GuardValue( isAtFunctionTop ) = false; |
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[1931bb01] | 252 | scopeLevel += 1; |
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| 253 | } |
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| 254 | |
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| 255 | void ReplaceTypedefCore::postvisit( ast::CompoundStmt const * ) { |
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| 256 | scopeLevel -= 1; |
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| 257 | } |
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| 258 | |
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| 259 | ast::StructDecl const * ReplaceTypedefCore::previsit( ast::StructDecl const * decl ) { |
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| 260 | visit_children = false; |
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| 261 | addImplicitTypedef( decl ); |
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| 262 | return handleAggregate( decl ); |
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| 263 | } |
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| 264 | |
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| 265 | ast::UnionDecl const * ReplaceTypedefCore::previsit( ast::UnionDecl const * decl ) { |
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| 266 | visit_children = false; |
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| 267 | addImplicitTypedef( decl ); |
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| 268 | return handleAggregate( decl ); |
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| 269 | } |
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| 270 | |
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| 271 | void ReplaceTypedefCore::previsit( ast::EnumDecl const * decl ) { |
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| 272 | addImplicitTypedef( decl ); |
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| 273 | } |
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| 274 | |
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| 275 | void ReplaceTypedefCore::previsit( ast::TraitDecl const * decl ) { |
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| 276 | GuardScope( typedefNames ); |
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| 277 | GuardScope( typedeclNames ); |
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| 278 | } |
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| 279 | |
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| 280 | template<typename AggrDecl> |
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| 281 | void ReplaceTypedefCore::addImplicitTypedef( AggrDecl * aggrDecl ) { |
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| 282 | if ( 0 != typedefNames.count( aggrDecl->name ) ) { |
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| 283 | return; |
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| 284 | } |
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| 285 | ast::Type * type = nullptr; |
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| 286 | if ( auto structDecl = dynamic_cast<const ast::StructDecl *>( aggrDecl ) ) { |
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| 287 | type = new ast::StructInstType( structDecl->name ); |
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| 288 | } else if ( auto unionDecl = dynamic_cast<const ast::UnionDecl *>( aggrDecl ) ) { |
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| 289 | type = new ast::UnionInstType( unionDecl->name ); |
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| 290 | } else if ( auto enumDecl = dynamic_cast<const ast::EnumDecl *>( aggrDecl ) ) { |
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| 291 | type = new ast::EnumInstType( enumDecl->name ); |
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| 292 | } |
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| 293 | assert( type ); |
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| 294 | |
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| 295 | TypedefDeclPtr typeDecl = new ast::TypedefDecl( aggrDecl->location, |
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| 296 | aggrDecl->name, ast::Storage::Classes(), type, aggrDecl->linkage ); |
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| 297 | // Add the implicit typedef to the AST. |
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| 298 | declsToAddBefore.push_back( ast::deepCopy( typeDecl.get() ) ); |
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| 299 | // Shore the name in the map of names. |
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| 300 | typedefNames[ aggrDecl->name ] = |
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| 301 | std::make_pair( std::move( typeDecl ), scopeLevel ); |
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| 302 | } |
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| 303 | |
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| 304 | template<typename AggrDecl> |
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| 305 | AggrDecl const * ReplaceTypedefCore::handleAggregate( AggrDecl const * decl ) { |
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| 306 | SemanticErrorException errors; |
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| 307 | |
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| 308 | ValueGuard<decltype(declsToAddBefore)> oldBeforeDecls( declsToAddBefore ); |
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| 309 | ValueGuard<decltype(declsToAddAfter )> oldAfterDecls( declsToAddAfter ); |
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| 310 | declsToAddBefore.clear(); |
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| 311 | declsToAddAfter.clear(); |
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| 312 | |
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| 313 | GuardScope( typedefNames ); |
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| 314 | GuardScope( typedeclNames ); |
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| 315 | decl = mutate_each( decl, &ast::AggregateDecl::params, *visitor ); |
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| 316 | decl = mutate_each( decl, &ast::AggregateDecl::attributes, *visitor ); |
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| 317 | |
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| 318 | auto mut = ast::mutate( decl ); |
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| 319 | |
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| 320 | std::vector<ast::ptr<ast::Decl>> members; |
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| 321 | // Unroll accept_all for decl->members so that implicit typedefs for |
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| 322 | // nested types are added to the aggregate body. |
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| 323 | for ( ast::ptr<ast::Decl> const & member : mut->members ) { |
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| 324 | assert( declsToAddAfter.empty() ); |
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| 325 | ast::Decl const * newMember = nullptr; |
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| 326 | try { |
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| 327 | newMember = member->accept( *visitor ); |
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| 328 | } catch ( SemanticErrorException & e ) { |
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| 329 | errors.append( e ); |
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| 330 | } |
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| 331 | if ( !declsToAddBefore.empty() ) { |
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| 332 | for ( auto declToAdd : declsToAddBefore ) { |
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| 333 | members.push_back( declToAdd ); |
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| 334 | } |
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| 335 | declsToAddBefore.clear(); |
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| 336 | } |
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| 337 | members.push_back( newMember ); |
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| 338 | } |
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| 339 | assert( declsToAddAfter.empty() ); |
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| 340 | if ( !errors.isEmpty() ) { throw errors; } |
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| 341 | |
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| 342 | mut->members.clear(); |
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| 343 | for ( auto member : members ) { |
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| 344 | mut->members.push_back( member ); |
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| 345 | } |
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| 346 | |
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| 347 | return mut; |
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| 348 | } |
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| 349 | |
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| 350 | } // namespace |
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| 351 | |
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| 352 | void replaceTypedef( ast::TranslationUnit & translationUnit ) { |
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| 353 | ast::Pass<ReplaceTypedefCore> pass; |
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| 354 | ast::accept_all( translationUnit, pass ); |
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| 355 | if ( pass.core.typedefNames.count( "size_t" ) ) { |
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| 356 | translationUnit.global.sizeType = |
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| 357 | ast::deepCopy( pass.core.typedefNames["size_t"].first->base ); |
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| 358 | } else { |
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| 359 | // Missing the global definition, default to long unsigned int. |
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| 360 | // Perhaps this should be a warning instead. |
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| 361 | translationUnit.global.sizeType = |
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| 362 | new ast::BasicType( ast::BasicType::LongUnsignedInt ); |
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| 363 | } |
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| 364 | } |
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| 365 | |
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| 366 | } // namespace Validate |
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| 367 | |
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| 368 | // Local Variables: // |
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| 369 | // tab-width: 4 // |
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| 370 | // mode: c++ // |
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| 371 | // compile-command: "make install" // |
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| 372 | // End: // |
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