1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2015 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 | // Expr.hpp -- |
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8 | // |
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9 | // Author : Aaron B. Moss |
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10 | // Created On : Fri May 10 10:30:00 2019 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Created On : Fri May 10 10:30:00 2019 |
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13 | // Update Count : 7 |
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14 | // |
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15 | |
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16 | #pragma once |
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17 | |
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18 | #include <cassert> |
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19 | #include <deque> |
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20 | #include <map> |
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21 | #include <string> |
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22 | #include <utility> // for move |
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23 | #include <vector> |
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24 | #include <optional> |
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25 | |
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26 | #include "Fwd.hpp" // for UniqueId |
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27 | #include "Label.hpp" |
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28 | #include "Decl.hpp" |
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29 | #include "ParseNode.hpp" |
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30 | #include "Visitor.hpp" |
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31 | |
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32 | // Must be included in *all* AST classes; should be #undef'd at the end of the file |
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33 | #define MUTATE_FRIEND \ |
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34 | template<typename node_t> friend node_t * mutate(const node_t * node); \ |
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35 | template<typename node_t> friend node_t * shallowCopy(const node_t * node); |
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36 | |
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37 | |
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38 | class ConverterOldToNew; |
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39 | class ConverterNewToOld; |
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40 | |
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41 | namespace ast { |
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42 | |
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43 | /// Contains the ID of a declaration and a type that is derived from that declaration, |
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44 | /// but subject to decay-to-pointer and type parameter renaming |
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45 | struct ParamEntry { |
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46 | UniqueId decl; |
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47 | readonly<Decl> declptr; |
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48 | ptr<Type> actualType; |
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49 | ptr<Type> formalType; |
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50 | ptr<Expr> expr; |
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51 | |
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52 | ParamEntry() : decl( 0 ), declptr( nullptr ), actualType( nullptr ), formalType( nullptr ), expr( nullptr ) {} |
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53 | ParamEntry( |
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54 | UniqueId id, const Decl * declptr, const Type * actual, const Type * formal, |
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55 | const Expr * e ) |
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56 | : decl( id ), declptr( declptr ), actualType( actual ), formalType( formal ), expr( e ) {} |
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57 | }; |
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58 | |
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59 | /// Pre-resolution list of parameters to infer |
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60 | using ResnSlots = std::vector<UniqueId>; |
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61 | /// Post-resolution map of inferred parameters |
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62 | using InferredParams = std::map< UniqueId, ParamEntry >; |
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63 | |
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64 | /// Base node for expressions |
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65 | class Expr : public ParseNode { |
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66 | public: |
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67 | /* |
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68 | * NOTE: the union approach is incorrect until the case of |
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69 | * partial resolution in InferMatcher is eliminated. |
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70 | * it is reverted to allow unresolved and resolved parameters |
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71 | * to coexist in an expression node. |
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72 | */ |
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73 | struct InferUnion { |
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74 | // mode is now unused |
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75 | enum { Empty, Slots, Params } mode; |
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76 | struct data_t { |
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77 | // char def; |
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78 | ResnSlots * resnSlots; |
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79 | InferredParams * inferParams; |
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80 | |
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81 | data_t(): resnSlots(nullptr), inferParams(nullptr) {} |
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82 | data_t(const data_t &other) = delete; |
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83 | ~data_t() { |
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84 | delete resnSlots; |
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85 | delete inferParams; |
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86 | } |
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87 | } data; |
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88 | |
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89 | /// initializes from other InferUnion |
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90 | void init_from( const InferUnion& o ) { |
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91 | if (o.data.resnSlots) { |
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92 | data.resnSlots = new ResnSlots(*o.data.resnSlots); |
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93 | } |
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94 | if (o.data.inferParams) { |
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95 | data.inferParams = new InferredParams(*o.data.inferParams); |
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96 | } |
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97 | } |
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98 | |
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99 | /// initializes from other InferUnion (move semantics) |
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100 | void init_from( InferUnion&& o ) { |
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101 | data.resnSlots = o.data.resnSlots; |
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102 | data.inferParams = o.data.inferParams; |
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103 | o.data.resnSlots = nullptr; |
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104 | o.data.inferParams = nullptr; |
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105 | } |
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106 | |
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107 | InferUnion() : mode(Empty), data() {} |
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108 | InferUnion( const InferUnion& o ) : mode( o.mode ), data() { init_from( o ); } |
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109 | InferUnion( InferUnion&& o ) : mode( o.mode ), data() { init_from( std::move(o) ); } |
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110 | InferUnion& operator= ( const InferUnion& ) = delete; |
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111 | InferUnion& operator= ( InferUnion&& ) = delete; |
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112 | |
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113 | bool hasSlots() const { return data.resnSlots; } |
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114 | |
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115 | ResnSlots& resnSlots() { |
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116 | if (!data.resnSlots) { |
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117 | data.resnSlots = new ResnSlots(); |
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118 | } |
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119 | return *data.resnSlots; |
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120 | } |
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121 | |
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122 | const ResnSlots& resnSlots() const { |
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123 | if (data.resnSlots) { |
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124 | return *data.resnSlots; |
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125 | } |
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126 | assertf(false, "Mode was not already resnSlots"); |
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127 | abort(); |
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128 | } |
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129 | |
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130 | InferredParams& inferParams() { |
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131 | if (!data.inferParams) { |
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132 | data.inferParams = new InferredParams(); |
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133 | } |
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134 | return *data.inferParams; |
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135 | } |
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136 | |
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137 | const InferredParams& inferParams() const { |
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138 | if (data.inferParams) { |
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139 | return *data.inferParams; |
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140 | } |
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141 | assertf(false, "Mode was not already Params"); |
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142 | abort(); |
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143 | } |
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144 | |
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145 | void set_inferParams( InferredParams * ps ) { |
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146 | delete data.resnSlots; |
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147 | data.resnSlots = nullptr; |
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148 | delete data.inferParams; |
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149 | data.inferParams = ps; |
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150 | } |
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151 | |
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152 | /// splices other InferUnion into this one. Will fail if one union is in `Slots` mode |
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153 | /// and the other is in `Params`. |
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154 | void splice( InferUnion && o ) { |
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155 | if (o.data.resnSlots) { |
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156 | if (data.resnSlots) { |
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157 | data.resnSlots->insert( |
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158 | data.resnSlots->end(), o.data.resnSlots->begin(), o.data.resnSlots->end() ); |
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159 | delete o.data.resnSlots; |
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160 | } |
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161 | else { |
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162 | data.resnSlots = o.data.resnSlots; |
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163 | } |
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164 | o.data.resnSlots = nullptr; |
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165 | } |
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166 | |
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167 | if (o.data.inferParams) { |
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168 | if (data.inferParams) { |
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169 | for ( const auto & p : *o.data.inferParams ) { |
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170 | (*data.inferParams)[p.first] = std::move(p.second); |
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171 | } |
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172 | delete o.data.inferParams; |
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173 | } |
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174 | else { |
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175 | data.inferParams = o.data.inferParams; |
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176 | } |
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177 | o.data.inferParams = nullptr; |
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178 | } |
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179 | } |
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180 | }; |
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181 | |
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182 | ptr<Type> result; |
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183 | ptr<TypeSubstitution> env; |
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184 | InferUnion inferred; |
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185 | bool extension = false; |
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186 | |
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187 | Expr( const CodeLocation & loc, const Type * res = nullptr ) |
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188 | : ParseNode( loc ), result( res ), env(), inferred() {} |
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189 | |
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190 | Expr * set_extension( bool ex ) { extension = ex; return this; } |
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191 | virtual bool get_lvalue() const; |
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192 | |
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193 | virtual const Expr * accept( Visitor & v ) const override = 0; |
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194 | private: |
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195 | Expr * clone() const override = 0; |
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196 | MUTATE_FRIEND |
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197 | }; |
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198 | |
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199 | /// The application of a function to a set of parameters. |
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200 | /// Post-resolver form of `UntypedExpr` |
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201 | class ApplicationExpr final : public Expr { |
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202 | public: |
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203 | ptr<Expr> func; |
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204 | std::vector<ptr<Expr>> args; |
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205 | |
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206 | ApplicationExpr( const CodeLocation & loc, const Expr * f, std::vector<ptr<Expr>> && as = {} ); |
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207 | |
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208 | bool get_lvalue() const final; |
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209 | |
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210 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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211 | private: |
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212 | ApplicationExpr * clone() const override { return new ApplicationExpr{ *this }; } |
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213 | MUTATE_FRIEND |
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214 | }; |
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215 | |
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216 | /// The application of a function to a set of parameters, pre-overload resolution. |
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217 | class UntypedExpr final : public Expr { |
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218 | public: |
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219 | ptr<Expr> func; |
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220 | std::vector<ptr<Expr>> args; |
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221 | |
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222 | UntypedExpr( const CodeLocation & loc, const Expr * f, std::vector<ptr<Expr>> && as = {} ) |
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223 | : Expr( loc ), func( f ), args( std::move(as) ) {} |
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224 | |
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225 | bool get_lvalue() const final; |
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226 | |
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227 | /// Creates a new dereference expression |
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228 | static UntypedExpr * createDeref( const CodeLocation & loc, const Expr * arg ); |
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229 | /// Creates a new assignment expression |
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230 | static UntypedExpr * createAssign( const CodeLocation & loc, const Expr * lhs, const Expr * rhs ); |
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231 | |
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232 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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233 | private: |
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234 | UntypedExpr * clone() const override { return new UntypedExpr{ *this }; } |
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235 | MUTATE_FRIEND |
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236 | }; |
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237 | |
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238 | /// A name whose name is as-yet undetermined. |
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239 | /// May also be used to avoid name mangling in codegen phase. |
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240 | class NameExpr final : public Expr { |
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241 | public: |
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242 | std::string name; |
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243 | |
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244 | NameExpr( const CodeLocation & loc, const std::string & n ) : Expr( loc ), name( n ) {} |
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245 | |
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246 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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247 | private: |
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248 | NameExpr * clone() const override { return new NameExpr{ *this }; } |
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249 | MUTATE_FRIEND |
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250 | }; |
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251 | |
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252 | /// A reference to a named variable. |
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253 | class VariableExpr final : public Expr { |
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254 | public: |
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255 | readonly<DeclWithType> var; |
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256 | |
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257 | VariableExpr( const CodeLocation & loc ); |
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258 | VariableExpr( const CodeLocation & loc, const DeclWithType * v ); |
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259 | |
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260 | bool get_lvalue() const final; |
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261 | |
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262 | /// generates a function pointer for a given function |
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263 | static VariableExpr * functionPointer( const CodeLocation & loc, const FunctionDecl * decl ); |
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264 | |
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265 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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266 | private: |
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267 | VariableExpr * clone() const override { return new VariableExpr{ *this }; } |
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268 | MUTATE_FRIEND |
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269 | }; |
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270 | |
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271 | /// Address-of expression `&e` |
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272 | class AddressExpr final : public Expr { |
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273 | public: |
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274 | ptr<Expr> arg; |
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275 | |
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276 | AddressExpr( const CodeLocation & loc, const Expr * a ); |
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277 | |
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278 | /// Generate AddressExpr wrapping given expression at same location |
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279 | AddressExpr( const Expr * a ) : AddressExpr( a->location, a ) {} |
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280 | |
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281 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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282 | private: |
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283 | AddressExpr * clone() const override { return new AddressExpr{ *this }; } |
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284 | MUTATE_FRIEND |
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285 | }; |
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286 | |
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287 | /// GCC &&label |
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288 | /// https://gcc.gnu.org/onlinedocs/gcc-3.4.2/gcc/Labels-as-Values.html |
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289 | class LabelAddressExpr final : public Expr { |
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290 | public: |
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291 | Label arg; |
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292 | |
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293 | LabelAddressExpr( const CodeLocation & loc, Label && a ); |
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294 | |
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295 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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296 | private: |
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297 | LabelAddressExpr * clone() const override { return new LabelAddressExpr{ *this }; } |
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298 | MUTATE_FRIEND |
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299 | }; |
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300 | |
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301 | /// Inidicates whether the cast is introduced by the CFA type system. |
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302 | /// GeneratedCast for casts that the resolver introduces to force a return type |
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303 | /// ExplicitCast for casts from user code |
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304 | /// ExplicitCast for casts from desugaring advanced CFA features into simpler CFA |
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305 | /// example |
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306 | /// int * p; // declaration |
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307 | /// (float *) p; // use, with subject cast |
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308 | /// subject cast being GeneratedCast means we are considering an interpretation with a type mismatch |
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309 | /// subject cast being ExplicitCast means someone in charge wants it that way |
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310 | enum GeneratedFlag { ExplicitCast, GeneratedCast }; |
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311 | |
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312 | /// A type cast, e.g. `(int)e` |
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313 | class CastExpr final : public Expr { |
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314 | public: |
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315 | ptr<Expr> arg; |
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316 | GeneratedFlag isGenerated; |
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317 | |
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318 | CastExpr( const CodeLocation & loc, const Expr * a, const Type * to, |
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319 | GeneratedFlag g = GeneratedCast ) : Expr( loc, to ), arg( a ), isGenerated( g ) {} |
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320 | /// Cast-to-void |
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321 | CastExpr( const CodeLocation & loc, const Expr * a, GeneratedFlag g = GeneratedCast ); |
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322 | |
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323 | /// Wrap a cast expression around an existing expression (always generated) |
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324 | CastExpr( const Expr * a, const Type * to ) : CastExpr( a->location, a, to, GeneratedCast ) {} |
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325 | |
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326 | /// Wrap a cast-to-void expression around an existing expression (always generated) |
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327 | CastExpr( const Expr * a ) : CastExpr( a->location, a, GeneratedCast ) {} |
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328 | |
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329 | bool get_lvalue() const final; |
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330 | |
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331 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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332 | private: |
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333 | CastExpr * clone() const override { return new CastExpr{ *this }; } |
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334 | MUTATE_FRIEND |
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335 | }; |
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336 | |
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337 | /// A cast to "keyword types", e.g. `(thread &)t` |
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338 | class KeywordCastExpr final : public Expr { |
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339 | public: |
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340 | ptr<Expr> arg; |
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341 | struct Concrete { |
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342 | std::string field; |
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343 | std::string getter; |
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344 | |
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345 | Concrete() = default; |
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346 | Concrete(const Concrete &) = default; |
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347 | }; |
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348 | ast::AggregateDecl::Aggregate target; |
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349 | Concrete concrete_target; |
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350 | |
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351 | |
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352 | KeywordCastExpr( const CodeLocation & loc, const Expr * a, ast::AggregateDecl::Aggregate t ) |
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353 | : Expr( loc ), arg( a ), target( t ) {} |
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354 | |
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355 | KeywordCastExpr( const CodeLocation & loc, const Expr * a, ast::AggregateDecl::Aggregate t, const Concrete & ct ) |
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356 | : Expr( loc ), arg( a ), target( t ), concrete_target( ct ) {} |
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357 | |
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358 | /// Get a name for the target type |
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359 | const char * targetString() const; |
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360 | |
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361 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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362 | private: |
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363 | KeywordCastExpr * clone() const override { return new KeywordCastExpr{ *this }; } |
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364 | MUTATE_FRIEND |
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365 | }; |
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366 | |
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367 | /// A virtual dynamic cast, e.g. `(virtual exception)e` |
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368 | class VirtualCastExpr final : public Expr { |
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369 | public: |
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370 | ptr<Expr> arg; |
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371 | |
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372 | VirtualCastExpr( const CodeLocation & loc, const Expr * a, const Type * to ) |
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373 | : Expr( loc, to ), arg( a ) {} |
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374 | |
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375 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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376 | private: |
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377 | VirtualCastExpr * clone() const override { return new VirtualCastExpr{ *this }; } |
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378 | MUTATE_FRIEND |
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379 | }; |
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380 | |
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381 | /// A member selection operation before expression resolution, e.g. `q.p` |
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382 | class UntypedMemberExpr final : public Expr { |
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383 | public: |
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384 | ptr<Expr> member; |
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385 | ptr<Expr> aggregate; |
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386 | |
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387 | UntypedMemberExpr( const CodeLocation & loc, const Expr * mem, const Expr * agg ) |
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388 | : Expr( loc ), member( mem ), aggregate( agg ) { assert( aggregate ); } |
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389 | |
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390 | bool get_lvalue() const final; |
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391 | |
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392 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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393 | private: |
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394 | UntypedMemberExpr * clone() const override { return new UntypedMemberExpr{ *this }; } |
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395 | MUTATE_FRIEND |
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396 | }; |
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397 | |
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398 | /// A member selection operation after expression resolution, e.g. `q.p` |
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399 | class MemberExpr final : public Expr { |
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400 | public: |
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401 | readonly<DeclWithType> member; |
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402 | ptr<Expr> aggregate; |
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403 | |
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404 | MemberExpr( const CodeLocation & loc, const DeclWithType * mem, const Expr * agg ); |
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405 | |
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406 | bool get_lvalue() const final; |
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407 | |
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408 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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409 | private: |
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410 | MemberExpr * clone() const override { return new MemberExpr{ *this }; } |
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411 | MUTATE_FRIEND |
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412 | |
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413 | // Custructor overload meant only for AST conversion |
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414 | enum NoOpConstruction { NoOpConstructionChosen }; |
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415 | MemberExpr( const CodeLocation & loc, const DeclWithType * mem, const Expr * agg, |
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416 | NoOpConstruction overloadSelector ); |
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417 | friend class ::ConverterOldToNew; |
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418 | friend class ::ConverterNewToOld; |
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419 | }; |
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420 | |
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421 | /// A compile-time constant. |
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422 | /// Mostly carries C-source text from parse to code-gen, without interpretation. E.g. strings keep their outer quotes and never have backslashes interpreted. |
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423 | /// Integer constants get special treatment, e.g. for verifying array operations, when an integer constant occurs as the length of an array. |
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424 | class ConstantExpr final : public Expr { |
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425 | public: |
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426 | // Representation of this constant, as it occurs in .cfa source and .cfa.cc result. |
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427 | std::string rep; |
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428 | |
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429 | ConstantExpr( |
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430 | const CodeLocation & loc, const Type * ty, const std::string & r, |
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431 | std::optional<unsigned long long> i ) |
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432 | : Expr( loc, ty ), rep( r ), ival( i ), underlyer(ty) {} |
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433 | |
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434 | /// Gets the integer value of this constant, if one is appropriate to its type. |
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435 | /// Throws a SemanticError if the type is not appropriate for value-as-integer. |
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436 | /// Suffers an assertion failure the type is appropriate but no integer value was supplied to the constructor. |
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437 | long long int intValue() const; |
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438 | |
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439 | /// generates a boolean constant of the given bool |
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440 | static ConstantExpr * from_bool( const CodeLocation & loc, bool b ); |
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441 | /// generates an integer constant of the given int |
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442 | static ConstantExpr * from_int( const CodeLocation & loc, int i ); |
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443 | /// generates an integer constant of the given unsigned long int |
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444 | static ConstantExpr * from_ulong( const CodeLocation & loc, unsigned long i ); |
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445 | /// generates a null pointer value for the given type. void * if omitted. |
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446 | static ConstantExpr * null( const CodeLocation & loc, const Type * ptrType = nullptr ); |
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447 | |
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448 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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449 | private: |
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450 | ConstantExpr * clone() const override { return new ConstantExpr{ *this }; } |
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451 | MUTATE_FRIEND |
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452 | |
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453 | std::optional<unsigned long long> ival; |
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454 | |
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455 | // Intended only for legacy support of roundtripping the old AST. |
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456 | // Captures the very-locally inferred type, before the resolver modifies the type of this ConstantExpression. |
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457 | // In the old AST it's constExpr->constant.type |
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458 | ptr<Type> underlyer; |
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459 | friend class ::ConverterOldToNew; |
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460 | friend class ::ConverterNewToOld; |
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461 | }; |
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462 | |
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463 | /// sizeof expression, e.g. `sizeof(int)`, `sizeof 3+4` |
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464 | class SizeofExpr final : public Expr { |
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465 | public: |
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466 | ptr<Expr> expr; |
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467 | ptr<Type> type; |
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468 | |
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469 | SizeofExpr( const CodeLocation & loc, const Expr * e ); |
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470 | SizeofExpr( const CodeLocation & loc, const Type * t ); |
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471 | // deliberately no disambiguating overload for nullptr_t |
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472 | |
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473 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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474 | private: |
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475 | SizeofExpr * clone() const override { return new SizeofExpr{ *this }; } |
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476 | MUTATE_FRIEND |
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477 | }; |
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478 | |
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479 | /// alignof expression, e.g. `alignof(int)`, `alignof 3+4` |
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480 | class AlignofExpr final : public Expr { |
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481 | public: |
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482 | ptr<Expr> expr; |
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483 | ptr<Type> type; |
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484 | |
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485 | AlignofExpr( const CodeLocation & loc, const Expr * e ); |
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486 | AlignofExpr( const CodeLocation & loc, const Type * t ); |
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487 | // deliberately no disambiguating overload for nullptr_t |
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488 | |
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489 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
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490 | private: |
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491 | AlignofExpr * clone() const override { return new AlignofExpr{ *this }; } |
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492 | MUTATE_FRIEND |
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493 | }; |
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494 | |
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495 | /// offsetof expression before resolver determines field, e.g. `offsetof(MyStruct, myfield)` |
---|
496 | class UntypedOffsetofExpr final : public Expr { |
---|
497 | public: |
---|
498 | ptr<Type> type; |
---|
499 | std::string member; |
---|
500 | |
---|
501 | UntypedOffsetofExpr( const CodeLocation & loc, const Type * ty, const std::string & mem ) |
---|
502 | : Expr( loc ), type( ty ), member( mem ) {} |
---|
503 | |
---|
504 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
505 | private: |
---|
506 | UntypedOffsetofExpr * clone() const override { return new UntypedOffsetofExpr{ *this }; } |
---|
507 | MUTATE_FRIEND |
---|
508 | }; |
---|
509 | |
---|
510 | /// offsetof expression after resolver determines field, e.g. `offsetof(MyStruct, myfield)` |
---|
511 | class OffsetofExpr final : public Expr { |
---|
512 | public: |
---|
513 | ptr<Type> type; |
---|
514 | readonly<DeclWithType> member; |
---|
515 | |
---|
516 | OffsetofExpr( const CodeLocation & loc, const Type * ty, const DeclWithType * mem ); |
---|
517 | |
---|
518 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
519 | private: |
---|
520 | OffsetofExpr * clone() const override { return new OffsetofExpr{ *this }; } |
---|
521 | MUTATE_FRIEND |
---|
522 | }; |
---|
523 | |
---|
524 | /// a pack of field-offsets for a generic type |
---|
525 | class OffsetPackExpr final : public Expr { |
---|
526 | public: |
---|
527 | ptr<StructInstType> type; |
---|
528 | |
---|
529 | OffsetPackExpr( const CodeLocation & loc, const StructInstType * ty ); |
---|
530 | |
---|
531 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
532 | private: |
---|
533 | OffsetPackExpr * clone() const override { return new OffsetPackExpr{ *this }; } |
---|
534 | MUTATE_FRIEND |
---|
535 | }; |
---|
536 | |
---|
537 | /// Variants of short-circuiting logical expression |
---|
538 | enum LogicalFlag { OrExpr, AndExpr }; |
---|
539 | |
---|
540 | /// Short-circuiting boolean expression (`&&` or `||`) |
---|
541 | class LogicalExpr final : public Expr { |
---|
542 | public: |
---|
543 | ptr<Expr> arg1; |
---|
544 | ptr<Expr> arg2; |
---|
545 | LogicalFlag isAnd; |
---|
546 | |
---|
547 | LogicalExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2, LogicalFlag ia ); |
---|
548 | |
---|
549 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
550 | private: |
---|
551 | LogicalExpr * clone() const override { return new LogicalExpr{ *this }; } |
---|
552 | MUTATE_FRIEND |
---|
553 | }; |
---|
554 | |
---|
555 | /// Three-argument conditional e.g. `p ? a : b` |
---|
556 | class ConditionalExpr final : public Expr { |
---|
557 | public: |
---|
558 | ptr<Expr> arg1; |
---|
559 | ptr<Expr> arg2; |
---|
560 | ptr<Expr> arg3; |
---|
561 | |
---|
562 | ConditionalExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2, const Expr * a3 ) |
---|
563 | : Expr( loc ), arg1( a1 ), arg2( a2 ), arg3( a3 ) {} |
---|
564 | |
---|
565 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
566 | private: |
---|
567 | ConditionalExpr * clone() const override { return new ConditionalExpr{ *this }; } |
---|
568 | MUTATE_FRIEND |
---|
569 | }; |
---|
570 | |
---|
571 | /// Comma expression e.g. `( a , b )` |
---|
572 | class CommaExpr final : public Expr { |
---|
573 | public: |
---|
574 | ptr<Expr> arg1; |
---|
575 | ptr<Expr> arg2; |
---|
576 | |
---|
577 | CommaExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2 ) |
---|
578 | : Expr( loc ), arg1( a1 ), arg2( a2 ) { |
---|
579 | this->result = a2->result; |
---|
580 | } |
---|
581 | |
---|
582 | bool get_lvalue() const final; |
---|
583 | |
---|
584 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
585 | private: |
---|
586 | CommaExpr * clone() const override { return new CommaExpr{ *this }; } |
---|
587 | MUTATE_FRIEND |
---|
588 | }; |
---|
589 | |
---|
590 | /// A type used as an expression (e.g. a type generator parameter) |
---|
591 | class TypeExpr final : public Expr { |
---|
592 | public: |
---|
593 | ptr<Type> type; |
---|
594 | |
---|
595 | TypeExpr( const CodeLocation & loc, const Type * t ) : Expr(loc), type(t) {} |
---|
596 | |
---|
597 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
598 | private: |
---|
599 | TypeExpr * clone() const override { return new TypeExpr{ *this }; } |
---|
600 | MUTATE_FRIEND |
---|
601 | }; |
---|
602 | |
---|
603 | /// A GCC "asm constraint operand" used in an asm statement, e.g. `[output] "=f" (result)`. |
---|
604 | /// https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/Machine-Constraints.html#Machine-Constraints |
---|
605 | class AsmExpr final : public Expr { |
---|
606 | public: |
---|
607 | std::string inout; |
---|
608 | ptr<Expr> constraint; |
---|
609 | ptr<Expr> operand; |
---|
610 | |
---|
611 | AsmExpr( const CodeLocation & loc, const std::string & io, const Expr * con, const Expr * op ) |
---|
612 | : Expr( loc ), inout( io ), constraint( con ), operand( op ) {} |
---|
613 | |
---|
614 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
615 | private: |
---|
616 | AsmExpr * clone() const override { return new AsmExpr{ *this }; } |
---|
617 | MUTATE_FRIEND |
---|
618 | }; |
---|
619 | |
---|
620 | /// The application of a function to a set of parameters, along with a set of copy constructor |
---|
621 | /// calls, one for each argument |
---|
622 | class ImplicitCopyCtorExpr final : public Expr { |
---|
623 | public: |
---|
624 | ptr<ApplicationExpr> callExpr; |
---|
625 | |
---|
626 | ImplicitCopyCtorExpr( const CodeLocation& loc, const ApplicationExpr * call ) |
---|
627 | : Expr( loc, call->result ), callExpr(call) { assert( call ); assert(call->result); } |
---|
628 | |
---|
629 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
630 | private: |
---|
631 | ImplicitCopyCtorExpr * clone() const override { return new ImplicitCopyCtorExpr{ *this }; } |
---|
632 | MUTATE_FRIEND |
---|
633 | }; |
---|
634 | |
---|
635 | /// Constructor in expression context, e.g. `int * x = alloc() { 42 };` |
---|
636 | class ConstructorExpr final : public Expr { |
---|
637 | public: |
---|
638 | ptr<Expr> callExpr; |
---|
639 | |
---|
640 | ConstructorExpr( const CodeLocation & loc, const Expr * call ); |
---|
641 | |
---|
642 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
643 | private: |
---|
644 | ConstructorExpr * clone() const override { return new ConstructorExpr{ *this }; } |
---|
645 | MUTATE_FRIEND |
---|
646 | }; |
---|
647 | |
---|
648 | /// A C99 compound literal, e.g. `(MyType){ a, b, c }` |
---|
649 | class CompoundLiteralExpr final : public Expr { |
---|
650 | public: |
---|
651 | ptr<Init> init; |
---|
652 | |
---|
653 | CompoundLiteralExpr( const CodeLocation & loc, const Type * t, const Init * i ); |
---|
654 | |
---|
655 | bool get_lvalue() const final; |
---|
656 | |
---|
657 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
658 | private: |
---|
659 | CompoundLiteralExpr * clone() const override { return new CompoundLiteralExpr{ *this }; } |
---|
660 | MUTATE_FRIEND |
---|
661 | }; |
---|
662 | |
---|
663 | /// A range, e.g. `3 ... 5` or `1~10` |
---|
664 | class RangeExpr final : public Expr { |
---|
665 | public: |
---|
666 | ptr<Expr> low; |
---|
667 | ptr<Expr> high; |
---|
668 | |
---|
669 | RangeExpr( const CodeLocation & loc, const Expr * l, const Expr * h ) |
---|
670 | : Expr( loc ), low( l ), high( h ) {} |
---|
671 | |
---|
672 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
673 | private: |
---|
674 | RangeExpr * clone() const override { return new RangeExpr{ *this }; } |
---|
675 | MUTATE_FRIEND |
---|
676 | }; |
---|
677 | |
---|
678 | /// A tuple expression before resolution, e.g. `[a, b, c]` |
---|
679 | class UntypedTupleExpr final : public Expr { |
---|
680 | public: |
---|
681 | std::vector<ptr<Expr>> exprs; |
---|
682 | |
---|
683 | UntypedTupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs ) |
---|
684 | : Expr( loc ), exprs( std::move(xs) ) {} |
---|
685 | |
---|
686 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
687 | private: |
---|
688 | UntypedTupleExpr * clone() const override { return new UntypedTupleExpr{ *this }; } |
---|
689 | MUTATE_FRIEND |
---|
690 | }; |
---|
691 | |
---|
692 | /// A tuple expression after resolution, e.g. `[a, b, c]` |
---|
693 | class TupleExpr final : public Expr { |
---|
694 | public: |
---|
695 | std::vector<ptr<Expr>> exprs; |
---|
696 | |
---|
697 | TupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs ); |
---|
698 | |
---|
699 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
700 | private: |
---|
701 | TupleExpr * clone() const override { return new TupleExpr{ *this }; } |
---|
702 | MUTATE_FRIEND |
---|
703 | }; |
---|
704 | |
---|
705 | /// An element selection operation on a tuple value, e.g. `t.3` after analysis |
---|
706 | class TupleIndexExpr final : public Expr { |
---|
707 | public: |
---|
708 | ptr<Expr> tuple; |
---|
709 | unsigned index; |
---|
710 | |
---|
711 | TupleIndexExpr( const CodeLocation & loc, const Expr * t, unsigned i ); |
---|
712 | |
---|
713 | bool get_lvalue() const final; |
---|
714 | |
---|
715 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
716 | private: |
---|
717 | TupleIndexExpr * clone() const override { return new TupleIndexExpr{ *this }; } |
---|
718 | MUTATE_FRIEND |
---|
719 | }; |
---|
720 | |
---|
721 | /// A multiple- or mass-assignment operation, or a tuple ctor/dtor expression. |
---|
722 | /// multiple-assignment: both sides of the assignment have tuple type, |
---|
723 | /// e.g. `[a, b, c] = [d, e, f];` |
---|
724 | /// mass-assignment: left-hand side has tuple type and right-hand side does not: |
---|
725 | /// e.g. `[a, b, c] = 42;` |
---|
726 | class TupleAssignExpr final : public Expr { |
---|
727 | public: |
---|
728 | ptr<StmtExpr> stmtExpr; |
---|
729 | |
---|
730 | TupleAssignExpr( |
---|
731 | const CodeLocation & loc, std::vector<ptr<Expr>> && assigns, |
---|
732 | std::vector<ptr<ObjectDecl>> && tempDecls ); |
---|
733 | |
---|
734 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
735 | |
---|
736 | friend class ::ConverterOldToNew; |
---|
737 | |
---|
738 | private: |
---|
739 | TupleAssignExpr * clone() const override { return new TupleAssignExpr{ *this }; } |
---|
740 | TupleAssignExpr( const CodeLocation & loc, const Type * result, const StmtExpr * s ); |
---|
741 | |
---|
742 | MUTATE_FRIEND |
---|
743 | }; |
---|
744 | |
---|
745 | /// A GCC "statement expression", e.g. `({ int x = 5; x })` |
---|
746 | class StmtExpr final : public Expr { |
---|
747 | public: |
---|
748 | ptr<CompoundStmt> stmts; |
---|
749 | std::vector<ptr<ObjectDecl>> returnDecls; ///< return variable(s) for statement expression |
---|
750 | std::vector<ptr<Expr>> dtors; ///< destructor(s) for return variable(s) |
---|
751 | |
---|
752 | readonly<ExprStmt> resultExpr; |
---|
753 | |
---|
754 | StmtExpr( const CodeLocation & loc, const CompoundStmt * ss ); |
---|
755 | |
---|
756 | /// Set the result type of this StmtExpr based on its body |
---|
757 | void computeResult(); |
---|
758 | |
---|
759 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
760 | private: |
---|
761 | StmtExpr * clone() const override { return new StmtExpr{ *this }; } |
---|
762 | MUTATE_FRIEND |
---|
763 | }; |
---|
764 | |
---|
765 | /// An expression which must only be evaluated once |
---|
766 | class UniqueExpr final : public Expr { |
---|
767 | static unsigned long long nextId; |
---|
768 | public: |
---|
769 | ptr<Expr> expr; |
---|
770 | ptr<ObjectDecl> object; |
---|
771 | ptr<VariableExpr> var; |
---|
772 | unsigned long long id; |
---|
773 | |
---|
774 | UniqueExpr( const CodeLocation & loc, const Expr * e, unsigned long long i = -1ull ); |
---|
775 | |
---|
776 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
777 | private: |
---|
778 | UniqueExpr * clone() const override { return new UniqueExpr{ *this }; } |
---|
779 | MUTATE_FRIEND |
---|
780 | }; |
---|
781 | |
---|
782 | /// One option for resolving an initializer expression |
---|
783 | struct InitAlternative { |
---|
784 | ptr<Type> type; |
---|
785 | ptr<Designation> designation; |
---|
786 | |
---|
787 | InitAlternative() = default; |
---|
788 | InitAlternative( const Type * ty, const Designation * des ) : type( ty ), designation( des ) {} |
---|
789 | }; |
---|
790 | |
---|
791 | /// Pre-resolution initializer expression |
---|
792 | class UntypedInitExpr final : public Expr { |
---|
793 | public: |
---|
794 | ptr<Expr> expr; |
---|
795 | std::deque<InitAlternative> initAlts; |
---|
796 | |
---|
797 | UntypedInitExpr( const CodeLocation & loc, const Expr * e, std::deque<InitAlternative> && as ) |
---|
798 | : Expr( loc ), expr( e ), initAlts( std::move(as) ) {} |
---|
799 | |
---|
800 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
801 | private: |
---|
802 | UntypedInitExpr * clone() const override { return new UntypedInitExpr{ *this }; } |
---|
803 | MUTATE_FRIEND |
---|
804 | }; |
---|
805 | |
---|
806 | /// Post-resolution initializer expression |
---|
807 | class InitExpr final : public Expr { |
---|
808 | public: |
---|
809 | ptr<Expr> expr; |
---|
810 | ptr<Designation> designation; |
---|
811 | |
---|
812 | InitExpr( const CodeLocation & loc, const Expr * e, const Designation * des ) |
---|
813 | : Expr( loc, e->result ), expr( e ), designation( des ) {} |
---|
814 | |
---|
815 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
816 | private: |
---|
817 | InitExpr * clone() const override { return new InitExpr{ *this }; } |
---|
818 | MUTATE_FRIEND |
---|
819 | }; |
---|
820 | |
---|
821 | /// Expression containing a deleted identifier. |
---|
822 | /// Internal to resolver. |
---|
823 | class DeletedExpr final : public Expr { |
---|
824 | public: |
---|
825 | ptr<Expr> expr; |
---|
826 | readonly<Decl> deleteStmt; |
---|
827 | |
---|
828 | DeletedExpr( const CodeLocation & loc, const Expr * e, const Decl * del ) |
---|
829 | : Expr( loc, e->result ), expr( e ), deleteStmt( del ) { assert( expr->result ); } |
---|
830 | |
---|
831 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
832 | private: |
---|
833 | DeletedExpr * clone() const override { return new DeletedExpr{ *this }; } |
---|
834 | MUTATE_FRIEND |
---|
835 | }; |
---|
836 | |
---|
837 | /// Use of a default argument. |
---|
838 | /// Internal to resolver. |
---|
839 | class DefaultArgExpr final : public Expr { |
---|
840 | public: |
---|
841 | ptr<Expr> expr; |
---|
842 | |
---|
843 | DefaultArgExpr( const CodeLocation & loc, const Expr * e ) |
---|
844 | : Expr( loc, e->result ), expr( e ) { assert( e->result ); } |
---|
845 | |
---|
846 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
847 | private: |
---|
848 | DefaultArgExpr * clone() const override { return new DefaultArgExpr{ *this }; } |
---|
849 | MUTATE_FRIEND |
---|
850 | }; |
---|
851 | |
---|
852 | /// C11 _Generic expression |
---|
853 | class GenericExpr final : public Expr { |
---|
854 | public: |
---|
855 | /// One arm of the _Generic expr |
---|
856 | struct Association { |
---|
857 | ptr<Type> type; |
---|
858 | ptr<Expr> expr; |
---|
859 | |
---|
860 | Association() = default; |
---|
861 | // default case |
---|
862 | Association( const Expr * e ) : type(), expr( e ) {} |
---|
863 | // non-default case |
---|
864 | Association( const Type * t, const Expr * e ) : type( t ), expr( e ) {} |
---|
865 | }; |
---|
866 | |
---|
867 | ptr<Expr> control; |
---|
868 | std::vector<Association> associations; |
---|
869 | |
---|
870 | GenericExpr( const CodeLocation & loc, const Expr * ctrl, std::vector<Association> && assns ) |
---|
871 | : Expr( loc ), control( ctrl ), associations( std::move(assns) ) {} |
---|
872 | |
---|
873 | const Expr * accept( Visitor & v ) const override { return v.visit( this ); } |
---|
874 | private: |
---|
875 | GenericExpr * clone() const override { return new GenericExpr{ *this }; } |
---|
876 | MUTATE_FRIEND |
---|
877 | }; |
---|
878 | |
---|
879 | |
---|
880 | } |
---|
881 | |
---|
882 | #undef MUTATE_FRIEND |
---|
883 | |
---|
884 | // Local Variables: // |
---|
885 | // tab-width: 4 // |
---|
886 | // mode: c++ // |
---|
887 | // compile-command: "make install" // |
---|
888 | // End: // |
---|