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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7 | // LinkReferenceToTypes.cpp -- Connect instance types to declarations.
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8 | //
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9 | // Author : Andrew Beach
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10 | // Created On : Thr Apr 21 11:41:00 2022
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11 | // Last Modified By : Andrew Beach
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12 | // Last Modified On : Tue Sep 20 16:17:00 2022
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13 | // Update Count : 2
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14 | //
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15 |
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16 | #include "Validate/LinkReferenceToTypes.hpp"
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17 |
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18 | #include "AST/Pass.hpp"
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19 | #include "AST/TranslationUnit.hpp"
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20 | #include "Validate/ForallPointerDecay.hpp"
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21 | #include "Validate/NoIdSymbolTable.hpp"
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22 |
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23 | namespace Validate {
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24 |
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25 | namespace {
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26 |
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27 | struct LinkTypesCore : public WithNoIdSymbolTable,
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28 | public ast::WithCodeLocation,
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29 | public ast::WithGuards,
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30 | public ast::WithShortCircuiting,
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31 | public ast::WithVisitorRef<LinkTypesCore> {
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32 | ast::TypeInstType const * postvisit( ast::TypeInstType const * type );
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33 | ast::EnumInstType const * postvisit( ast::EnumInstType const * type );
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34 | ast::StructInstType const * postvisit( ast::StructInstType const * type );
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35 | ast::UnionInstType const * postvisit( ast::UnionInstType const * type );
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36 | ast::TraitInstType const * postvisit( ast::TraitInstType const * type );
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37 | void previsit( ast::QualifiedType const * type );
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38 | void postvisit( ast::QualifiedType const * type );
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39 |
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40 | ast::EnumDecl const * postvisit( ast::EnumDecl const * decl );
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41 | ast::StructDecl const * previsit( ast::StructDecl const * decl );
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42 | void postvisit( ast::StructDecl const * decl );
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43 | ast::UnionDecl const * previsit( ast::UnionDecl const * decl );
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44 | void postvisit( ast::UnionDecl const * decl );
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45 | ast::TraitDecl const * postvisit( ast::TraitDecl const * decl );
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46 |
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47 | private:
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48 | using ForwardStructsType =
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49 | std::map< std::string, std::list< ast::StructInstType * > >;
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50 | using ForwardUnionsType =
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51 | std::map< std::string, std::list< ast::UnionInstType * > >;
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52 | using ForwardEnumsType =
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53 | std::map< std::string, std::list< ast::EnumInstType * > >;
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54 |
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55 | ForwardStructsType forwardStructs;
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56 | ForwardUnionsType forwardUnions;
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57 | ForwardEnumsType forwardEnums;
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58 |
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59 | /// true if currently in a generic type body,
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60 | /// so that type parameter instances can be renamed appropriately
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61 | bool inGeneric = false;
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62 |
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63 | template<typename AggrDecl>
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64 | AggrDecl const * renameGenericParams( AggrDecl const * decl );
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65 | };
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66 |
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67 | ast::TypeInstType const * LinkTypesCore::postvisit( ast::TypeInstType const * type ) {
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68 | auto mut = ast::mutate( type );
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69 | if ( inGeneric && mut->base ) {
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70 | mut->name = mut->base->name;
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71 | }
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72 | if ( auto namedTypeDecl = symtab.lookupType( mut->name ) ) {
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73 | if ( auto typeDecl = dynamic_cast<ast::TypeDecl const *>( namedTypeDecl ) ) {
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74 | mut->kind = typeDecl->kind;
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75 | }
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76 | }
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77 | return mut;
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78 | }
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79 |
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80 | ast::EnumInstType const * LinkTypesCore::postvisit( ast::EnumInstType const * type ) {
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81 | ast::EnumDecl const * decl = symtab.lookupEnum( type->name );
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82 | // It's not a semantic error if the enum is not found, just an implicit forward declaration.
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83 | if ( decl ) {
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84 | // Just linking in the node.
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85 | auto mut = ast::mutate( type );
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86 | mut->base = const_cast<ast::EnumDecl *>( decl );
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87 | type = mut;
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88 | }
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89 | if ( !decl || !decl->body ) {
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90 | auto mut = ast::mutate( type );
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91 | forwardEnums[ mut->name ].push_back( mut );
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92 | type = mut;
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93 | }
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94 | return type;
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95 | }
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96 |
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97 | ast::StructInstType const * LinkTypesCore::postvisit( ast::StructInstType const * type ) {
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98 | ast::StructDecl const * decl = symtab.lookupStruct( type->name );
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99 | // It's not a semantic error if the struct is not found, just an implicit forward declaration.
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100 | if ( decl ) {
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101 | // Just linking in the node.
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102 | auto mut = ast::mutate( type );
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103 | mut->base = const_cast<ast::StructDecl *>( decl );
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104 | type = mut;
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105 | }
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106 | if ( !decl || !decl->body ) {
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107 | auto mut = ast::mutate( type );
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108 | forwardStructs[ mut->name ].push_back( mut );
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109 | type = mut;
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110 | }
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111 | return type;
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112 | }
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113 |
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114 | ast::UnionInstType const * LinkTypesCore::postvisit( ast::UnionInstType const * type ) {
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115 | ast::UnionDecl const * decl = symtab.lookupUnion( type->name );
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116 | // It's not a semantic error if the union is not found, just an implicit forward declaration.
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117 | if ( decl ) {
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118 | // Just linking in the node.
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119 | auto mut = ast::mutate( type );
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120 | mut->base = const_cast<ast::UnionDecl *>( decl );
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121 | type = mut;
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122 | }
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123 | if ( !decl || !decl->body ) {
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124 | auto mut = ast::mutate( type );
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125 | forwardUnions[ mut->name ].push_back( mut );
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126 | type = mut;
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127 | }
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128 | return type;
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129 | }
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130 |
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131 | ast::TraitInstType const * LinkTypesCore::postvisit( ast::TraitInstType const * type ) {
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132 | assert( location );
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133 |
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134 | ast::TraitDecl const * decl = symtab.lookupTrait( type->name );
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135 | if ( !decl ) {
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136 | SemanticError( *location, "use of undeclared trait " + type->name );
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137 | } else if ( decl->params.size() != type->params.size() ) {
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138 | SemanticError( *location, "incorrect number of trait parameters: " );
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139 | }
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140 | auto mut = ast::mutate( type );
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141 |
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142 | // Just linking in the node.
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143 | mut->base = const_cast<ast::TraitDecl *>( decl );
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144 |
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145 | // Need to carry over the 'sized' status of each decl in the instance.
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146 | for ( auto p : group_iterate( decl->params, type->params ) ) {
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147 | ast::TypeExpr const * expr = std::get<1>(p).as<ast::TypeExpr>();
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148 | if ( !expr ) {
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149 | SemanticError( std::get<1>(p).get(), "Expression parameters for trait instances are currently unsupported: " );
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150 | }
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151 | if ( auto inst = expr->type.as<ast::TypeInstType>() ) {
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152 | ast::ptr<ast::TypeDecl> const & formalDecl = std::get<0>(p);
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153 | if ( !formalDecl->sized ) {
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154 | continue;
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155 | }
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156 | // To do this modification we need to reach through a readonly
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157 | // pointer. The Pass doesn't quite work in that way, so we just
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158 | // ensure it mutates in-place so it should work out.
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159 | ast::TypeDecl const * base = inst->base.get();
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160 | assert( base->unique() );
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161 | ast::TypeDecl * mutBase = ast::mutate( base );
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162 | mutBase->sized = true;
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163 | }
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164 | }
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165 | return mut;
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166 | }
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167 |
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168 | void LinkTypesCore::previsit( ast::QualifiedType const * ) {
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169 | visit_children = false;
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170 | }
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171 |
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172 | void LinkTypesCore::postvisit( ast::QualifiedType const * type ) {
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173 | // Linking only makes sense for the 'oldest ancestor' of the qualified type.
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174 | type->parent->accept( *visitor );
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175 | }
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176 |
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177 | ast::EnumDecl const * LinkTypesCore::postvisit( ast::EnumDecl const * decl ) {
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178 | // After visiting enum members for self-referencing members,
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179 | // we replace the enum base. Right now it only works for StructDecl.
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180 | if ( decl->base ) {
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181 | if ( auto base = decl->base.as<ast::TypeInstType>() ) {
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182 | if ( auto structDecl = symtab.lookupStruct( base->name ) ) {
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183 | auto mut = ast::mutate( decl );
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184 | mut->base = new ast::StructInstType( structDecl );
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185 | decl = mut;
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186 | }
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187 | // visit the base
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188 | } else if ( auto ptr = decl->base.as<ast::PointerType>() ) {
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189 | if ( auto base = ptr->base.as<ast::TypeInstType>() ) {
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190 | if ( auto structDecl = symtab.lookupStruct( base->name ) ) {
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191 | auto mut = ast::mutate( decl );
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192 | mut->base = new ast::PointerType(
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193 | new ast::StructInstType( structDecl ) );
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194 | decl = mut;
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195 | }
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196 | }
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197 | }
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198 | }
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199 |
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200 | // This section is common with struct/union, except for the return value.
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201 | if ( !decl->body ) {
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202 | return decl;
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203 | }
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204 |
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205 | // The following section
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206 |
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207 | ForwardEnumsType::iterator fwds = forwardEnums.find( decl->name );
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208 | if ( fwds != forwardEnums.end() ) {
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209 | for ( auto inst : fwds->second ) {
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210 | inst->base = decl;
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211 | }
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212 | forwardEnums.erase( fwds );
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213 | }
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214 |
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215 | return decl;
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216 | }
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217 |
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218 | template<typename AggrDecl>
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219 | AggrDecl const * LinkTypesCore::renameGenericParams( AggrDecl const * decl ) {
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220 | GuardValue( inGeneric ) = !decl->params.empty();
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221 | if ( !inGeneric ) {
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222 | return decl;
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223 | }
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224 | auto mut = ast::mutate( decl );
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225 | for ( ast::ptr<ast::TypeDecl> & typeDecl : mut->params ) {
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226 | typeDecl.get_and_mutate()->name = "__" + typeDecl->name + "_generic_";
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227 | }
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228 | return mut;
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229 | }
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230 |
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231 | ast::StructDecl const * LinkTypesCore::previsit( ast::StructDecl const * decl ) {
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232 | return renameGenericParams( decl );
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233 | }
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234 |
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235 | void LinkTypesCore::postvisit( ast::StructDecl const * decl ) {
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236 | if ( !decl->body ) {
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237 | return;
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238 | }
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239 |
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240 | ForwardStructsType::iterator fwds = forwardStructs.find( decl->name );
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241 | if ( fwds != forwardStructs.end() ) {
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242 | for ( auto inst : fwds->second ) {
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243 | inst->base = decl;
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244 | }
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245 | forwardStructs.erase( fwds );
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246 | }
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247 | }
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248 |
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249 | ast::UnionDecl const * LinkTypesCore::previsit( ast::UnionDecl const * decl ) {
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250 | return renameGenericParams( decl );
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251 | }
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252 |
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253 | void LinkTypesCore::postvisit( ast::UnionDecl const * decl ) {
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254 | if ( !decl->body ) {
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255 | return;
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256 | }
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257 |
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258 | ForwardUnionsType::iterator fwds = forwardUnions.find( decl->name );
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259 | if ( fwds != forwardUnions.end() ) {
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260 | for ( auto inst : fwds->second ) {
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261 | inst->base = decl;
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262 | }
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263 | forwardUnions.erase( fwds );
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264 | }
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265 | }
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266 |
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267 | ast::TraitDecl const * LinkTypesCore::postvisit( ast::TraitDecl const * decl ) {
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268 | auto mut = ast::mutate( decl );
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269 | if ( mut->name == "sized" ) {
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270 | // "sized" is a special trait - flick the sized status on for the type variable.
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271 | assertf( mut->params.size() == 1, "Built-in trait 'sized' has incorrect number of parameters: %zd", decl->params.size() );
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272 | ast::TypeDecl * td = mut->params.front().get_and_mutate();
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273 | td->sized = true;
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274 | }
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275 |
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276 | // There is some overlap with code from decayForallPointers,
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277 | // perhaps reorganization or shared helper functions are called for.
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278 | // Move assertions from type parameters into the body of the trait.
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279 | for ( ast::ptr<ast::TypeDecl> const & td : decl->params ) {
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280 | auto expanded = expandAssertions( td->assertions );
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281 | for ( auto declWithType : expanded ) {
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282 | mut->members.emplace_back( declWithType.release() );
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283 | }
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284 | }
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285 | return mut;
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286 | }
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287 |
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288 | } // namespace
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289 |
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290 | void linkReferenceToTypes( ast::TranslationUnit & translationUnit ) {
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291 | ast::Pass<LinkTypesCore>::run( translationUnit );
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292 | }
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293 |
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294 | } // namespace Validate
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295 |
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296 | // Local Variables: //
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297 | // tab-width: 4 //
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298 | // mode: c++ //
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299 | // compile-command: "make install" //
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300 | // End: //
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