1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 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 | // InstantiateGenericNew.cpp -- |
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8 | // |
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9 | // Author : Andrew Beach |
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10 | // Created On : Tue Aug 16 10:51:00 2022 |
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11 | // Last Modified By : Andrew Beach |
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12 | // Last Modified On : Tue Sep 13 16:03:00 2022 |
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13 | // Update Count : 0 |
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14 | // |
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15 | |
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16 | #include "InstantiateGeneric.h" |
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17 | |
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18 | #include <cassert> // for assertf, assert |
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19 | #include <set> // for set |
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20 | #include <utility> // for move, pair |
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21 | #include <vector> // for vector |
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22 | |
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23 | #include "AST/Copy.hpp" // for deepCopy |
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24 | #include "AST/Pass.hpp" // for Pass, WithGuard, WithShortCi... |
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25 | #include "AST/TranslationUnit.hpp" // for TranslationUnit |
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26 | #include "CodeGen/OperatorTable.h" // for isAssignment |
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27 | #include "Common/ScopedMap.h" // for ScopedMap |
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28 | #include "Common/UniqueName.h" // for UniqueName |
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29 | #include "GenPoly/GenPoly.h" // for isPolyType, typesPolyCompatible |
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30 | #include "GenPoly/ScrubTyVars.h" // for scrubAll |
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31 | #include "InitTweak/InitTweak.h" // for getFunction |
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32 | #include "ResolvExpr/typeops.h" // for typesCompatible |
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33 | |
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34 | namespace GenPoly { |
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35 | |
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36 | namespace { |
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37 | |
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38 | // Utilities: |
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39 | |
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40 | using type_vector = std::vector< ast::ptr< ast::TypeExpr > >; |
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41 | |
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42 | /// Abstracts type equality for a list of parameter types. |
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43 | struct TypeList { |
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44 | TypeList() : params() {} |
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45 | TypeList( std::vector< ast::ptr< ast::Type > > const & params ) : |
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46 | params( params ) {} |
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47 | TypeList( std::vector< ast::ptr< ast::Type > > && params ) : |
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48 | params( std::move( params ) ) {} |
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49 | TypeList( TypeList const & that ) : params( that.params ) {} |
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50 | TypeList( TypeList && that ) : params( std::move( that.params ) ) {} |
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51 | |
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52 | TypeList( std::vector< ast::ptr< ast::TypeExpr > > const & exprs ) : |
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53 | params() { |
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54 | for ( auto expr : exprs ) { |
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55 | params.emplace_back( ast::deepCopy( expr->type ) ); |
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56 | } |
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57 | } |
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58 | |
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59 | TypeList & operator=( TypeList const & that ) { |
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60 | params = that.params; |
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61 | return *this; |
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62 | } |
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63 | |
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64 | TypeList & operator=( TypeList && that ) { |
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65 | params = std::move( that.params ); |
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66 | return *this; |
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67 | } |
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68 | |
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69 | bool operator==( TypeList const & that ) const { |
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70 | if ( params.size() != that.params.size() ) { |
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71 | return false; |
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72 | } |
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73 | |
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74 | for ( auto it = params.begin(), jt = that.params.begin() ; |
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75 | it != params.end() ; ++it, ++jt ) { |
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76 | if ( !typesPolyCompatible( it->get(), jt->get() ) ) { |
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77 | return false; |
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78 | } |
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79 | } |
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80 | return true; |
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81 | } |
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82 | |
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83 | std::vector<ast::ptr<ast::Type>> params; |
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84 | }; |
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85 | |
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86 | /// Maps a key and a TypeList to a valuue. Also supports scoping. |
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87 | class InstantiationMap final { |
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88 | /// Wraps value for a specific (AggregateDecl, TypeList) combination. |
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89 | using Instantiation = std::pair<TypeList, ast::ptr<ast::AggregateDecl>>; |
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90 | /// List of TypeLists paired with the appropriate values. |
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91 | using ValueList = std::vector<Instantiation>; |
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92 | /// Underlying map type; maps keys to a linear list of corresponding |
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93 | /// TypeLists and values. |
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94 | using InnerMap = ScopedMap<ast::ptr<ast::AggregateDecl>, ValueList>; |
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95 | |
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96 | InnerMap data; |
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97 | public: |
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98 | void beginScope() { data.beginScope(); } |
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99 | void endScope() { data.endScope(); } |
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100 | |
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101 | /// Gets the value for the (declaration, type list) pair, |
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102 | /// returns null if no such value exists. |
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103 | ast::AggregateDecl const * lookup( |
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104 | ast::AggregateDecl const * key, type_vector const & params ) const { |
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105 | // This type repackaging is used for the helpers. |
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106 | ast::ptr<ast::AggregateDecl> ptr = key; |
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107 | TypeList typeList( params ); |
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108 | |
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109 | // Scan scopes for matches to the key. |
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110 | for ( auto insts = data.find( key ) ; |
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111 | insts != data.end() ; insts = data.findNext( insts, ptr )) { |
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112 | for ( auto inst = insts->second.rbegin() ; |
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113 | inst != insts->second.rend() ; ++inst ) { |
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114 | if ( inst->first == typeList ) { |
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115 | return inst->second; |
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116 | } |
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117 | } |
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118 | } |
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119 | return nullptr; |
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120 | } |
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121 | |
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122 | /// Adds a value for a (key, type list) pair to the current scope. |
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123 | void insert( ast::AggregateDecl const * key, type_vector const & params, |
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124 | ast::AggregateDecl const * value ) { |
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125 | auto it = data.findAt( data.currentScope(), key ); |
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126 | if ( it == data.end() ) { |
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127 | data.insert( key, ValueList( 1, |
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128 | Instantiation( TypeList( params ), value ) ) ); |
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129 | } else { |
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130 | it->second.emplace_back( |
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131 | Instantiation( TypeList( params ), value ) ); |
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132 | } |
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133 | } |
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134 | }; |
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135 | |
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136 | /// Possible options for a given specialization of a generic type. |
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137 | enum class GenericType { |
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138 | /// Concrete instatiation based solely on {d,f}type-to-void conversions. |
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139 | dtypeStatic, |
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140 | /// Concrete instatiation requiring at least one parameters type. |
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141 | concrete, |
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142 | /// No concrete instantiation. |
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143 | dynamic |
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144 | }; |
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145 | |
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146 | GenericType & operator|=( GenericType & gt, const GenericType & ht ) { |
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147 | if ( gt < ht ) gt = ht; |
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148 | return gt; |
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149 | } |
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150 | |
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151 | bool isDtypeStatic( std::vector<ast::ptr<ast::TypeDecl>> const & baseParams ) { |
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152 | return std::all_of( baseParams.begin(), baseParams.end(), |
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153 | []( ast::TypeDecl const * td ){ return !td->isComplete(); } |
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154 | ); |
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155 | } |
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156 | |
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157 | /// Makes substitutions of params into baseParams; returns dtypeStatic if |
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158 | /// there is a concrete instantiation based only on {d,f}type-to-void |
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159 | /// conversions, concrete if there is a concrete instantiation requiring at |
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160 | /// least one parameter type, and dynamic if there is no concrete instantiation. |
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161 | GenericType makeSubstitutions( |
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162 | std::vector<ast::ptr<ast::TypeExpr>> & out, |
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163 | std::vector<ast::ptr<ast::TypeDecl>> const & baseParams, |
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164 | std::vector<ast::ptr<ast::Expr>> const & params ) { |
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165 | GenericType gt = GenericType::dtypeStatic; |
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166 | |
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167 | // Substitute concrete types for given parameters, |
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168 | // using incomplete types for placeholders. |
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169 | auto baseParam = baseParams.begin(); |
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170 | auto param = params.begin(); |
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171 | for ( ; baseParam != baseParams.end() && param != params.end() ; |
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172 | ++baseParam, ++param ) { |
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173 | ast::TypeExpr const * paramExpr = param->as<ast::TypeExpr>(); |
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174 | assertf( paramExpr, "Aggregate parameters should be type expressions." ); |
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175 | |
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176 | if ( (*baseParam)->isComplete() ) { |
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177 | // Substitute parameter for complete (otype or sized dtype) type. |
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178 | if ( isPolyType( paramExpr->type ) ) { |
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179 | // Substitute polymorphic parameter type in to generic type. |
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180 | out.push_back( ast::deepCopy( paramExpr ) ); |
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181 | gt = GenericType::dynamic; |
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182 | } else { |
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183 | // Normalize possibly dtype-static parameter type. |
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184 | out.emplace_back( new ast::TypeExpr( paramExpr->location, |
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185 | scrubAllTypeVars( ast::deepCopy( paramExpr->type ) ) ) ); |
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186 | gt |= GenericType::concrete; |
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187 | } |
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188 | } else switch ( (*baseParam)->kind ) { |
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189 | case ast::TypeDecl::Dtype: |
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190 | // Here, pretend that any incomplete dtype is `void`. |
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191 | out.emplace_back( new ast::TypeExpr( paramExpr->location, |
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192 | new ast::VoidType() ) ); |
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193 | break; |
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194 | case ast::TypeDecl::Ftype: |
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195 | // Here, pretend that any ftype is `void (*)(void)`. |
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196 | out.emplace_back( new ast::TypeExpr( paramExpr->location, |
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197 | new ast::FunctionType() ) ); |
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198 | break; |
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199 | case ast::TypeDecl::Ttype: |
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200 | assertf( false, "Ttype parameters are not currently allowed as parameters to generic types." ); |
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201 | break; |
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202 | default: |
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203 | assertf( false, "Unhandled type parameter kind" ); |
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204 | break; |
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205 | } |
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206 | } |
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207 | |
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208 | assertf( baseParam == baseParams.end(), "Base Parameters not exausted." ); |
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209 | assertf( param == params.end(), "Type parameters not exausted." ); |
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210 | return gt; |
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211 | } |
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212 | |
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213 | /// Substitutes types of members according to baseParams => typeSubs, |
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214 | /// returning the result in a new vector. |
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215 | std::vector<ast::ptr<ast::Decl>> substituteMembers( |
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216 | std::vector<ast::ptr<ast::Decl>> const & members, |
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217 | std::vector<ast::ptr<ast::TypeDecl>> const & baseParams, |
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218 | std::vector<ast::ptr<ast::TypeExpr>> const & typeSubs ) { |
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219 | std::vector<ast::ptr<ast::Decl>> out; |
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220 | ast::TypeSubstitution subs( baseParams, typeSubs ); |
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221 | for ( ast::ptr<ast::Decl> const & member : members ) { |
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222 | // Create a manual copy to avoid in-place mutation. |
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223 | // If being a PureVisitor is decided to be part of apply's interface, |
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224 | // then we can actually skip this step as it will never mutate in- |
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225 | // place. (Then we don't need the extra guard to free temp value.) |
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226 | ast::ptr<ast::Decl> copy = ast::deepCopy( member.get() ); |
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227 | auto result = subs.apply( copy.get() ); |
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228 | out.emplace_back( result.node ); |
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229 | } |
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230 | return out; |
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231 | } |
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232 | |
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233 | /// Substitutes types of members according to baseParams => typeSubs, |
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234 | /// modifying them in-place. |
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235 | void substituteMembersHere( |
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236 | std::vector<ast::ptr<ast::Decl>> & members, |
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237 | std::vector<ast::ptr<ast::TypeDecl>> const & baseParams, |
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238 | std::vector<ast::ptr<ast::TypeExpr>> const & typeSubs ) { |
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239 | ast::TypeSubstitution subs( baseParams, typeSubs ); |
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240 | for ( ast::ptr<ast::Decl> & member : members ) { |
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241 | // The member must be mutated in place to avoid breaking |
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242 | assert( member->unique() ); |
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243 | |
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244 | auto field = member.strict_as<ast::ObjectDecl>(); |
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245 | auto result = subs.apply( field->type.get() ); |
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246 | auto copy = ast::mutate_field( |
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247 | field, &ast::ObjectDecl::type, result.node ); |
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248 | |
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249 | // I'm not kidding, it is very important. |
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250 | assert( copy == member.get() ); |
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251 | } |
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252 | } |
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253 | |
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254 | /// Strips the instances' type parameters. |
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255 | void stripInstParams( ast::BaseInstType * inst ) { |
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256 | inst->params.clear(); |
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257 | } |
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258 | |
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259 | // TODO: I think this should become a generic helper. |
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260 | template<typename Aggr> |
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261 | Aggr * asForward( Aggr const * decl ) { |
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262 | if ( !decl->body ) { |
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263 | return nullptr; |
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264 | } |
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265 | Aggr * mut = ast::deepCopy( decl ); |
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266 | mut->body = false; |
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267 | mut->members.clear(); |
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268 | return mut; |
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269 | } |
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270 | |
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271 | bool isGenericType( ast::Type const * type ) { |
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272 | if ( auto inst = dynamic_cast<ast::StructInstType const *>( type ) ) { |
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273 | return !inst->params.empty(); |
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274 | } else if ( auto inst = dynamic_cast<ast::UnionInstType const *>( type ) ) { |
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275 | return !inst->params.empty(); |
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276 | } else { |
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277 | return false; |
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278 | } |
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279 | } |
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280 | |
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281 | // The Passes: |
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282 | |
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283 | struct FixDtypeStatic final : |
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284 | public ast::WithGuards, |
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285 | public ast::WithVisitorRef<FixDtypeStatic>, |
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286 | public ast::WithShortCircuiting, |
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287 | public ast::WithStmtsToAdd<> { |
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288 | ast::ApplicationExpr const * previsit( ast::ApplicationExpr const * expr ); |
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289 | void previsit( ast::AddressExpr const * expr ); |
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290 | |
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291 | ast::Expr const * postvisit( ast::MemberExpr const * expr ); |
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292 | private: |
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293 | template<typename Aggr> |
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294 | ast::Expr const * fixMemberExpr( |
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295 | Aggr const * inst, ast::MemberExpr const * memberExpr ); |
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296 | |
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297 | ast::Expr const * fixMemberExpr( |
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298 | std::vector<ast::ptr<ast::TypeDecl>> const & baseParams, |
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299 | ast::MemberExpr const * memberExpr ); |
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300 | |
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301 | bool isLValueArg = false; |
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302 | }; |
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303 | |
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304 | ast::ApplicationExpr const * FixDtypeStatic::previsit( |
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305 | ast::ApplicationExpr const * expr ) { |
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306 | GuardValue( isLValueArg ) = false; |
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307 | ast::Decl const * function = InitTweak::getFunction( expr ); |
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308 | if ( ast::Linkage::Intrinsic != function->linkage |
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309 | || !CodeGen::isAssignment( function->name ) ) { |
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310 | return expr; |
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311 | } |
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312 | |
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313 | // Explicity visit children because only the first element must be a |
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314 | // C lvalue (normally, it can only send info to both or neither). |
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315 | visit_children = false; |
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316 | expr = mutate_field( expr, &ast::ApplicationExpr::env, |
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317 | maybe_accept( expr->env.get(), *visitor ) ); |
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318 | expr = mutate_field( expr, &ast::ApplicationExpr::result, |
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319 | maybe_accept( expr->result.get(), *visitor ) ); |
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320 | expr = mutate_field( expr, &ast::ApplicationExpr::func, |
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321 | maybe_accept( expr->func.get(), *visitor ) ); |
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322 | isLValueArg = true; |
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323 | for ( unsigned i = 0; i < expr->args.size(); ++i ) { |
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324 | ast::Expr const * newExpr = expr->args[i]->accept( *visitor ); |
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325 | // This is declared here for lifetime reasons. |
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326 | ast::ptr<ast::CastExpr> cast; |
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327 | if ( newExpr != expr->args[i].get() && |
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328 | (cast = dynamic_cast<ast::CastExpr const *>( newExpr )) ) { |
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329 | newExpr = cast->arg.get(); |
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330 | } |
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331 | expr = mutate_field_index( expr, &ast::ApplicationExpr::args, |
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332 | i, newExpr ); |
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333 | isLValueArg = false; |
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334 | } |
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335 | return expr; |
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336 | } |
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337 | |
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338 | void FixDtypeStatic::previsit( ast::AddressExpr const * ) { |
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339 | // The argument of an address expression (`&`) must be a C lvalue. |
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340 | GuardValue( isLValueArg ) = true; |
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341 | } |
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342 | |
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343 | ast::Expr const * FixDtypeStatic::postvisit( ast::MemberExpr const * expr ) { |
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344 | ast::ptr<ast::Type> const & type = expr->aggregate->result; |
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345 | if ( !isGenericType( type ) ) { |
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346 | return expr; |
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347 | } else if ( auto inst = type.as<ast::StructInstType>() ) { |
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348 | return fixMemberExpr( inst, expr ); |
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349 | } else if ( auto inst = type.as<ast::UnionInstType>() ) { |
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350 | return fixMemberExpr( inst, expr ); |
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351 | } |
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352 | return expr; |
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353 | } |
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354 | |
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355 | template<typename Aggr> |
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356 | ast::Expr const * FixDtypeStatic::fixMemberExpr( |
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357 | Aggr const * inst, ast::MemberExpr const * memberExpr ) { |
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358 | return fixMemberExpr( inst->base->params, memberExpr ); |
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359 | } |
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360 | |
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361 | ast::Expr const * FixDtypeStatic::fixMemberExpr( |
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362 | std::vector<ast::ptr<ast::TypeDecl>> const & baseParams, |
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363 | ast::MemberExpr const * memberExpr ) { |
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364 | // Need to cast dtype-static member expressions to their actual type |
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365 | // before the actual type type is erased. |
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366 | // NOTE: The casts here have the third argument (isGenerated) set to |
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367 | // ExplicitCast so that they casts persist until Box, where they are needed. |
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368 | |
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369 | if ( !isDtypeStatic( baseParams ) || |
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370 | ResolvExpr::typesCompatible( |
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371 | memberExpr->result, |
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372 | memberExpr->member->get_type(), ast::SymbolTable() ) ) { |
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373 | return memberExpr; |
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374 | } |
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375 | |
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376 | // Type of member and type of expression differ. |
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377 | ast::Type const * concType = ast::deepCopy( memberExpr->result ); |
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378 | CodeLocation const & location = memberExpr->location; |
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379 | if ( isLValueArg ) { |
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380 | // The result must be a C lvalue expression. So make a new reference |
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381 | // variable with the correct actual type to replace the |
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382 | // member expression. |
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383 | // forall(T &) |
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384 | // struct Ptr { |
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385 | // T * x; |
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386 | // }; |
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387 | // Ptr(int) p; |
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388 | // int i; |
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389 | // p.x = &i; |
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390 | // becomes |
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391 | // int *& _dtype_static_member_0 = (int **)&p.x; |
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392 | // _dtype_static_member_0 = &i; |
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393 | static UniqueName tmpNamer( "_dtype_static_member_" ); |
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394 | ast::Expr * init = new ast::CastExpr( location, |
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395 | new ast::AddressExpr( location, memberExpr ), |
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396 | new ast::PointerType( ast::deepCopy( concType ) ), |
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397 | ast::ExplicitCast |
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398 | ); |
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399 | ast::ObjectDecl * tmp = new ast::ObjectDecl( location, |
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400 | tmpNamer.newName(), |
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401 | new ast::ReferenceType( concType ), |
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402 | new ast::SingleInit( location, init ), |
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403 | ast::Storage::Classes(), |
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404 | ast::Linkage::C |
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405 | ); |
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406 | stmtsToAddBefore.push_back( new ast::DeclStmt( location, tmp ) ); |
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407 | return new ast::VariableExpr( location, tmp ); |
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408 | } else { |
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409 | // Here, it can simply add a cast to actual types. |
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410 | return new ast::CastExpr( location, |
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411 | memberExpr, |
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412 | concType, |
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413 | ast::ExplicitCast |
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414 | ); |
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415 | } |
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416 | } |
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417 | |
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418 | struct GenericInstantiator final : |
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419 | public ast::WithCodeLocation, |
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420 | public ast::WithConstTypeSubstitution, |
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421 | public ast::WithDeclsToAdd<>, |
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422 | public ast::WithGuards, |
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423 | public ast::WithVisitorRef<GenericInstantiator> |
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424 | { |
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425 | /// Map of (generic type, parameter list) pairs |
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426 | /// to concrete type instantiations. |
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427 | InstantiationMap instantiations; |
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428 | /// Set of types which are dtype-only generic |
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429 | /// (and therefore have static layout). |
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430 | std::set<ast::AggregateDecl const *> dtypeStatics; |
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431 | /// Namer for concrete types. |
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432 | UniqueName typeNamer; |
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433 | /// Should not make use of type environment to replace types of function |
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434 | /// parameter and return values. |
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435 | bool inFunctionType = false; |
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436 | /// Index of current member, used to recreate MemberExprs with the |
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437 | /// member from an instantiation. |
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438 | int memberIndex = -1; |
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439 | |
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440 | GenericInstantiator() : |
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441 | instantiations(), dtypeStatics(), typeNamer("_conc_") {} |
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442 | |
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443 | ast::Type const * postvisit( ast::StructInstType const * inst ); |
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444 | ast::Type const * postvisit( ast::UnionInstType const * inst ); |
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445 | |
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446 | void previsit( ast::MemberExpr const * expr ); |
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447 | ast::Expr const * postvisit( ast::MemberExpr const * expr ); |
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448 | ast::Expr const * postvisit( ast::Expr const * expr ); |
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449 | void previsit( ast::ParseNode const * node ); |
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450 | |
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451 | void previsit( ast::FunctionType const * ) { |
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452 | GuardValue( inFunctionType ) = true; |
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453 | } |
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454 | void beginScope() { |
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455 | instantiations.beginScope(); |
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456 | } |
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457 | void endScope() { |
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458 | instantiations.endScope(); |
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459 | } |
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460 | private: |
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461 | /// Wrap instantiation lookup for structures. |
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462 | ast::StructDecl const * lookup( |
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463 | ast::StructInstType const * inst, type_vector const & typeSubs ) const; |
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464 | /// Wrap instantiation lookup for unions. |
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465 | ast::UnionDecl const * lookup( |
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466 | ast::UnionInstType const * inst, type_vector const & typeSubs ) const; |
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467 | /// Wrap instantiation insertion for structures. |
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468 | void insert( ast::StructInstType const * inst, |
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469 | type_vector const & typeSubs, ast::StructDecl const * decl ); |
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470 | /// Wrap instantiation insertion for unions. |
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471 | void insert( ast::UnionInstType const * inst, |
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472 | type_vector const & typeSubs, ast::UnionDecl const * decl ); |
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473 | |
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474 | void replaceParametersWithConcrete( std::vector<ast::ptr<ast::Expr>> & params ); |
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475 | ast::Type const * replaceWithConcrete( ast::Type const * type, bool doClone ); |
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476 | |
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477 | template<typename AggrDecl> |
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478 | ast::Type const * fixInstType( ast::SueInstType<AggrDecl> const * inst ); |
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479 | |
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480 | /// Strips a dtype-static aggregate decl of its type parameters, |
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481 | /// marks it as stripped. |
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482 | void stripDtypeParams( ast::AggregateDecl * base, |
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483 | std::vector<ast::ptr<ast::TypeDecl>> & baseParams, |
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484 | std::vector<ast::ptr<ast::TypeExpr>> const & typeSubs ); |
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485 | }; |
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486 | |
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487 | // I think this and the UnionInstType can be made into a template function. |
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488 | ast::Type const * GenericInstantiator::postvisit( |
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489 | ast::StructInstType const * inst ) { |
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490 | return fixInstType( inst ); |
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491 | } |
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492 | |
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493 | ast::Type const * GenericInstantiator::postvisit( |
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494 | ast::UnionInstType const * inst ) { |
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495 | return fixInstType( inst ); |
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496 | } |
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497 | |
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498 | template<typename AggrDecl> |
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499 | ast::Type const * GenericInstantiator::fixInstType( |
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500 | ast::SueInstType<AggrDecl> const * inst ) { |
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501 | assert( location ); |
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502 | |
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503 | // There is nothing to mutate if the params are empty. |
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504 | if ( inst->params.empty() ) return inst; |
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505 | |
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506 | // Need to replace type variables to ensure that generic types are |
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507 | // instantiated for the return values of polymorphic functions (in |
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508 | // particular, for thunks, because they are not [currently] copy |
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509 | // constructed). |
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510 | // (This used to be run only on structures, but I believe both need it.) |
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511 | inst = strict_dynamic_cast<ast::SueInstType<AggrDecl> const *>( |
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512 | replaceWithConcrete( inst, false ) ); |
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513 | |
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514 | // Check for an already-instantiatiated dtype-static type. |
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515 | if ( dtypeStatics.find( inst->base ) != dtypeStatics.end() ) { |
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516 | auto mutInst = ast::mutate( inst ); |
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517 | stripInstParams( mutInst ); |
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518 | return mutInst; |
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519 | } |
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520 | |
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521 | // Check if the type can be concretely instantiated; |
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522 | // and put substitutions in typeSubs. |
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523 | assertf( inst->base, "Base data-type has parameters." ); |
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524 | std::vector<ast::ptr<ast::TypeExpr>> typeSubs; |
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525 | GenericType gt = makeSubstitutions( typeSubs, inst->base->params, inst->params ); |
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526 | switch ( gt ) { |
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527 | case GenericType::dtypeStatic: |
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528 | { |
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529 | auto mutInst = ast::mutate( inst ); |
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530 | assert( mutInst->base->unique() ); |
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531 | auto mutBase = mutInst->base.get_and_mutate(); |
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532 | stripDtypeParams( mutBase, mutBase->params, typeSubs ); |
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533 | stripInstParams( mutInst ); |
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534 | return mutInst; |
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535 | } |
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536 | case GenericType::concrete: |
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537 | { |
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538 | // Make concrete instantiation of generic type. |
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539 | AggrDecl const * concDecl = lookup( inst, typeSubs ); |
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540 | if ( !concDecl ) { |
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541 | // Set concDecl to new type, insert type declaration |
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542 | // into statements to add. |
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543 | AggrDecl * newDecl = new AggrDecl( *location, |
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544 | typeNamer.newName( inst->name ) |
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545 | ); |
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546 | newDecl->body = inst->base->body; |
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547 | newDecl->members = substituteMembers( |
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548 | inst->base->members, |
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549 | inst->base->params, |
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550 | typeSubs |
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551 | ); |
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552 | |
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553 | // Forward declare before recursion. (TODO: Only when needed, #199.) |
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554 | insert( inst, typeSubs, newDecl ); |
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555 | if ( AggrDecl const * forwardDecl = asForward( newDecl ) ) { |
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556 | declsToAddBefore.push_back( forwardDecl ); |
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557 | } |
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558 | // Recursively instantiate members: |
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559 | concDecl = strict_dynamic_cast<AggrDecl const *>( |
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560 | newDecl->accept( *visitor ) ); |
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561 | // Must occur before declaration is added so |
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562 | // that member instantiation appear first. |
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563 | declsToAddBefore.push_back( concDecl ); |
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564 | } |
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565 | return new ast::SueInstType<AggrDecl>( concDecl, inst->qualifiers ); |
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566 | } |
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567 | case GenericType::dynamic: |
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568 | // Do nothing. |
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569 | default: |
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570 | // Should never happen. |
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571 | return inst; |
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572 | } |
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573 | } |
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574 | |
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575 | void GenericInstantiator::previsit( ast::MemberExpr const * expr ) { |
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576 | GuardValue( location ) = &expr->location; |
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577 | GuardValue( memberIndex ) = -1; |
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578 | // Only run on expressions where the field being accessed is generic. |
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579 | if ( isGenericType( expr->aggregate->result ) ) { |
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580 | // Find the location of the member: |
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581 | ast::AggregateDecl const * aggr = |
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582 | expr->aggregate->result.strict_as<ast::BaseInstType>()->aggr(); |
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583 | std::vector<ast::ptr<ast::Decl>> const & members = aggr->members; |
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584 | auto it = std::find( members.begin(), members.end(), expr->member ); |
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585 | memberIndex = std::distance( members.begin(), it ); |
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586 | assertf( memberIndex < (int)members.size(), "Could not find member %s in generic type %s.", toString( expr->member ).c_str(), toString( expr->aggregate ).c_str() ); |
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587 | } |
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588 | } |
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589 | |
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590 | ast::Expr const * GenericInstantiator::postvisit( |
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591 | ast::MemberExpr const * expr ) { |
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592 | if ( memberIndex == -1 ) { |
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593 | return expr; |
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594 | } |
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595 | |
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596 | // Using the location from the generic type, find the member |
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597 | // in the instantiation and rebuild the member expression. |
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598 | ast::AggregateDecl const * aggr = |
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599 | expr->aggregate->result.strict_as<ast::BaseInstType>()->aggr(); |
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600 | assertf( memberIndex < (int)aggr->members.size(), "Instantiation somehow has fewer members than the generic type." ); |
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601 | ast::Decl const * member = *std::next( aggr->members.begin(), memberIndex ); |
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602 | assertf( member->name == expr->member->name, "Instantiation has different member order than the generic type. %s / %s", toString( member ).c_str(), toString( expr->member ).c_str() ); |
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603 | auto field = strict_dynamic_cast< ast::DeclWithType const * >( member ); |
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604 | ast::MemberExpr * ret = new ast::MemberExpr( expr->location, |
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605 | field, |
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606 | ast::deepCopy( expr->aggregate ) |
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607 | ); |
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608 | // For pointer decay: |
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609 | ret->result = ResolvExpr::adjustExprType( |
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610 | ret->result, |
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611 | ast::TypeEnvironment(), |
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612 | ast::SymbolTable() |
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613 | ); |
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614 | ret->env = expr->env; |
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615 | return ret; |
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616 | } |
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617 | |
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618 | ast::Expr const * GenericInstantiator::postvisit( ast::Expr const * expr ) { |
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619 | // We are not modifying env on MemberExpr, but that seems to work. |
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620 | if ( expr->env ) { |
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621 | auto newEnv = expr->env->accept( *visitor ); |
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622 | expr = ast::mutate_field( expr, &ast::Expr::env, newEnv ); |
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623 | } |
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624 | return expr; |
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625 | } |
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626 | |
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627 | void GenericInstantiator::previsit( ast::ParseNode const * node ) { |
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628 | GuardValue( location ) = &node->location; |
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629 | } |
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630 | |
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631 | ast::StructDecl const * GenericInstantiator::lookup( |
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632 | ast::StructInstType const * inst, |
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633 | type_vector const & typeSubs ) const { |
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634 | auto ret = instantiations.lookup( inst->base, typeSubs ); |
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635 | return strict_dynamic_cast<ast::StructDecl const *, nullptr>( ret ); |
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636 | } |
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637 | |
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638 | ast::UnionDecl const * GenericInstantiator::lookup( |
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639 | ast::UnionInstType const * inst, |
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640 | type_vector const & typeSubs ) const { |
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641 | auto ret = instantiations.lookup( inst->base, typeSubs ); |
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642 | return strict_dynamic_cast<ast::UnionDecl const *, nullptr>( ret ); |
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643 | } |
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644 | |
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645 | void GenericInstantiator::insert( ast::StructInstType const * inst, |
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646 | type_vector const & typeSubs, ast::StructDecl const * decl ) { |
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647 | instantiations.insert( inst->base, typeSubs, decl ); |
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648 | } |
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649 | |
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650 | void GenericInstantiator::insert( ast::UnionInstType const * inst, |
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651 | type_vector const & typeSubs, ast::UnionDecl const * decl ) { |
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652 | instantiations.insert( inst->base, typeSubs, decl ); |
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653 | } |
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654 | |
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655 | void GenericInstantiator::replaceParametersWithConcrete( |
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656 | std::vector<ast::ptr<ast::Expr>> & params ) { |
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657 | for ( ast::ptr<ast::Expr> & param : params ) { |
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658 | auto paramType = param.as<ast::TypeExpr>(); |
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659 | assertf( paramType, "Aggregate parameters should be type expressions." ); |
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660 | auto type = replaceWithConcrete( paramType->type, false ); |
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661 | param = ast::mutate_field( paramType, &ast::TypeExpr::type, type ); |
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662 | } |
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663 | } |
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664 | |
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665 | ast::Type const * GenericInstantiator::replaceWithConcrete( |
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666 | ast::Type const * type, bool doClone ) { |
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667 | if ( auto inst = dynamic_cast<ast::TypeInstType const *>( type ) ) { |
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668 | if ( typeSubs && !inFunctionType ) { |
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669 | ast::Type const * concType = typeSubs->lookup( inst ); |
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670 | return ast::deepCopy( ( concType ) ? concType : inst ); |
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671 | } |
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672 | } else if ( auto inst = dynamic_cast<ast::StructInstType const *>( type ) ) { |
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673 | auto mut = ( doClone ) ? ast::deepCopy( inst ) : ast::mutate( inst ); |
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674 | replaceParametersWithConcrete( mut->params ); |
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675 | return mut; |
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676 | } else if ( auto inst = dynamic_cast<ast::UnionInstType const *>( type ) ) { |
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677 | auto mut = ( doClone ) ? ast::deepCopy( inst ) : ast::mutate( inst ); |
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678 | replaceParametersWithConcrete( mut->params ); |
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679 | return mut; |
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680 | } |
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681 | return type; |
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682 | } |
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683 | |
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684 | void GenericInstantiator::stripDtypeParams( |
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685 | ast::AggregateDecl * base, |
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686 | std::vector<ast::ptr<ast::TypeDecl>> & baseParams, |
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687 | std::vector<ast::ptr<ast::TypeExpr>> const & typeSubs ) { |
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688 | substituteMembersHere( base->members, baseParams, typeSubs ); |
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689 | |
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690 | baseParams.clear(); |
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691 | |
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692 | dtypeStatics.insert( base ); |
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693 | } |
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694 | |
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695 | } // namespace |
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696 | |
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697 | void instantiateGeneric( ast::TranslationUnit & translationUnit ) { |
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698 | ast::Pass<FixDtypeStatic>::run( translationUnit ); |
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699 | ast::Pass<GenericInstantiator>::run( translationUnit ); |
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700 | } |
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701 | |
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702 | } // namespace GenPoly |
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703 | |
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704 | // Local Variables: // |
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705 | // tab-width: 4 // |
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706 | // mode: c++ // |
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707 | // compile-command: "make install" // |
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708 | // End: // |
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