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.cpp -- |
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8 | // |
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9 | // Author : Aaron B. Moss |
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10 | // Created On : Wed May 15 17:00:00 2019 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Created On : Wed May 18 13:56:00 2022 |
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13 | // Update Count : 12 |
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14 | // |
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15 | |
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16 | #include "Expr.hpp" |
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17 | |
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18 | #include <cassert> // for strict_dynamic_cast |
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19 | #include <string> // for to_string |
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20 | #include <vector> |
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21 | |
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22 | #include "Copy.hpp" // for shallowCopy |
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23 | #include "GenericSubstitution.hpp" |
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24 | #include "Inspect.hpp" |
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25 | #include "LinkageSpec.hpp" |
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26 | #include "Stmt.hpp" |
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27 | #include "Type.hpp" |
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28 | #include "TypeSubstitution.hpp" |
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29 | #include "Common/Utility.hpp" |
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30 | #include "Common/SemanticError.hpp" |
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31 | #include "GenPoly/Lvalue.hpp" // for referencesPermissable |
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32 | #include "ResolvExpr/Unify.hpp" // for extractResultType |
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33 | #include "Tuples/Tuples.hpp" // for makeTupleType |
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34 | |
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35 | namespace ast { |
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36 | |
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37 | namespace { |
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38 | std::set<std::string> const lvalueFunctionNames = {"*?", "?[?]"}; |
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39 | } |
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40 | |
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41 | // --- Expr |
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42 | bool Expr::get_lvalue() const { |
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43 | return false; |
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44 | } |
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45 | |
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46 | // --- ApplicationExpr |
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47 | |
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48 | ApplicationExpr::ApplicationExpr( const CodeLocation & loc, const Expr * f, |
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49 | std::vector<ptr<Expr>> && as ) |
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50 | : Expr( loc ), func( f ), args( std::move(as) ) { |
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51 | // ensure that `ApplicationExpr` result type is `FuncExpr` |
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52 | const PointerType * pt = strict_dynamic_cast< const PointerType * >( f->result.get() ); |
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53 | const FunctionType * fn = strict_dynamic_cast< const FunctionType * >( pt->base.get() ); |
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54 | |
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55 | result = ResolvExpr::extractResultType( fn ); |
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56 | assert( result ); |
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57 | } |
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58 | |
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59 | bool ApplicationExpr::get_lvalue() const { |
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60 | if ( const DeclWithType * func = getFunction( this ) ) { |
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61 | return func->linkage == Linkage::Intrinsic && lvalueFunctionNames.count( func->name ); |
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62 | } |
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63 | return false; |
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64 | } |
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65 | |
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66 | // --- UntypedExpr |
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67 | |
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68 | bool UntypedExpr::get_lvalue() const { |
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69 | std::string fname = getFunctionName( this ); |
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70 | return lvalueFunctionNames.count( fname ); |
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71 | } |
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72 | |
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73 | UntypedExpr * UntypedExpr::createDeref( const CodeLocation & loc, const Expr * arg ) { |
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74 | assert( arg ); |
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75 | |
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76 | UntypedExpr * ret = createCall( loc, "*?", { arg } ); |
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77 | if ( const Type * ty = arg->result ) { |
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78 | const Type * base = getPointerBase( ty ); |
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79 | assertf( base, "expected pointer type in dereference (type was %s)", toString( ty ).c_str() ); |
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80 | |
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81 | if ( GenPoly::referencesPermissable() ) { |
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82 | // if references are still allowed in the AST, dereference returns a reference |
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83 | ret->result = new ReferenceType{ base }; |
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84 | } else { |
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85 | // references have been removed, in which case dereference returns an lvalue of the |
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86 | // base type |
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87 | ret->result = base; |
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88 | } |
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89 | } |
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90 | return ret; |
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91 | } |
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92 | |
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93 | UntypedExpr * UntypedExpr::createAssign( const CodeLocation & loc, const Expr * lhs, const Expr * rhs ) { |
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94 | assert( lhs && rhs ); |
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95 | |
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96 | UntypedExpr * ret = createCall( loc, "?=?", { lhs, rhs } ); |
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97 | if ( lhs->result && rhs->result ) { |
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98 | // if both expressions are typed, assumes that this assignment is a C bitwise assignment, |
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99 | // so the result is the type of the RHS |
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100 | ret->result = rhs->result; |
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101 | } |
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102 | return ret; |
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103 | } |
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104 | |
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105 | UntypedExpr * UntypedExpr::createCall( const CodeLocation & loc, |
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106 | const std::string & name, std::vector<ptr<Expr>> && args ) { |
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107 | return new UntypedExpr( loc, |
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108 | new NameExpr( loc, name ), std::move( args ) ); |
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109 | } |
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110 | |
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111 | // --- VariableExpr |
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112 | |
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113 | VariableExpr::VariableExpr( const CodeLocation & loc ) |
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114 | : Expr( loc ), var( nullptr ) {} |
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115 | |
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116 | VariableExpr::VariableExpr( const CodeLocation & loc, const DeclWithType * v ) |
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117 | : Expr( loc ), var( v ) { |
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118 | assert( var ); |
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119 | assert( var->get_type() ); |
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120 | result = shallowCopy( var->get_type() ); |
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121 | } |
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122 | |
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123 | bool VariableExpr::get_lvalue() const { |
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124 | // It isn't always an lvalue, but it is never an rvalue. |
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125 | return true; |
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126 | } |
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127 | |
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128 | VariableExpr * VariableExpr::functionPointer( |
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129 | const CodeLocation & loc, const FunctionDecl * decl ) { |
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130 | // wrap usually-determined result type in a pointer |
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131 | VariableExpr * funcExpr = new VariableExpr{ loc, decl }; |
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132 | funcExpr->result = new PointerType{ funcExpr->result }; |
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133 | return funcExpr; |
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134 | } |
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135 | |
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136 | // --- AddressExpr |
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137 | |
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138 | // Address expressions are typed based on the following inference rules: |
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139 | // E : lvalue T &..& (n references) |
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140 | // &E : T *&..& (n references) |
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141 | // |
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142 | // E : T &..& (m references) |
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143 | // &E : T *&..& (m-1 references) |
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144 | |
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145 | namespace { |
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146 | /// The type of the address of a type. |
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147 | /// Caller is responsible for managing returned memory |
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148 | Type * addrType( const ptr<Type> & type ) { |
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149 | if ( auto refType = type.as< ReferenceType >() ) { |
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150 | return new ReferenceType( addrType( refType->base ), refType->qualifiers ); |
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151 | } else { |
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152 | return new PointerType( type ); |
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153 | } |
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154 | } |
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155 | |
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156 | /// The type of the address of an expression. |
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157 | /// Caller is responsible for managing returned memory |
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158 | Type * addrExprType( const CodeLocation & loc, const Expr * arg ) { |
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159 | assert( arg ); |
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160 | // If the expression's type is unknown, the address type is unknown. |
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161 | if ( nullptr == arg->result ) { |
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162 | return nullptr; |
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163 | // An lvalue is transformed directly. |
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164 | } else if ( arg->get_lvalue() ) { |
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165 | return addrType( arg->result ); |
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166 | // Strip a layer of reference to "create" an lvalue expression. |
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167 | } else if ( auto refType = arg->result.as< ReferenceType >() ) { |
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168 | return addrType( refType->base ); |
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169 | } else { |
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170 | SemanticError( loc, "Attempt to take address of non-lvalue expression %s", |
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171 | toString( arg->result.get() ).c_str() ); |
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172 | } |
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173 | } |
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174 | } |
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175 | |
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176 | AddressExpr::AddressExpr( const CodeLocation & loc, const Expr * a ) : |
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177 | Expr( loc, addrExprType( loc, a ) ), arg( a ) |
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178 | {} |
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179 | |
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180 | // --- LabelAddressExpr |
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181 | |
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182 | // label address always has type `void*` |
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183 | LabelAddressExpr::LabelAddressExpr( const CodeLocation & loc, Label && a ) |
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184 | : Expr( loc, new PointerType{ new VoidType{} } ), arg( a ) {} |
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185 | |
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186 | // --- CastExpr |
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187 | |
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188 | CastExpr::CastExpr( const CodeLocation & loc, const Expr * a, GeneratedFlag g, CastKind kind ) |
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189 | : Expr( loc, new VoidType{} ), arg( a ), isGenerated( g ), kind( kind ) {} |
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190 | |
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191 | bool CastExpr::get_lvalue() const { |
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192 | // This is actually wrong by C, but it works with our current set-up. |
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193 | return arg->get_lvalue(); |
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194 | } |
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195 | |
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196 | // --- KeywordCastExpr |
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197 | |
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198 | const char * KeywordCastExpr::targetString() const { |
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199 | return AggregateDecl::aggrString( target ); |
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200 | } |
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201 | |
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202 | // --- UntypedMemberExpr |
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203 | |
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204 | bool UntypedMemberExpr::get_lvalue() const { |
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205 | return aggregate->get_lvalue(); |
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206 | } |
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207 | |
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208 | // --- MemberExpr |
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209 | |
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210 | MemberExpr::MemberExpr( const CodeLocation & loc, const DeclWithType * mem, const Expr * agg ) |
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211 | : Expr( loc ), member( mem ), aggregate( agg ) { |
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212 | assert( member ); |
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213 | assert( aggregate ); |
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214 | assert( aggregate->result ); |
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215 | |
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216 | result = mem->get_type(); |
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217 | |
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218 | // substitute aggregate generic parameters into member type |
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219 | genericSubstitution( aggregate->result ).apply( result ); |
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220 | // ensure appropriate restrictions from aggregate type |
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221 | add_qualifiers( result, aggregate->result->qualifiers ); |
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222 | } |
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223 | |
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224 | bool MemberExpr::get_lvalue() const { |
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225 | // This is actually wrong by C, but it works with our current set-up. |
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226 | return true; |
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227 | } |
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228 | |
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229 | // --- ConstantExpr |
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230 | |
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231 | long long int ConstantExpr::intValue() const { |
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232 | if ( const BasicType * bty = result.as< BasicType >() ) { |
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233 | if ( bty->isInteger() ) { |
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234 | assert(ival); |
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235 | return ival.value(); |
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236 | } |
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237 | } else if ( result.as< ZeroType >() ) { |
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238 | return 0; |
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239 | } else if ( result.as< OneType >() ) { |
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240 | return 1; |
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241 | } |
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242 | SemanticError( this->location, "Constant expression of non-integral type %s", |
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243 | toString( this ).c_str() ); |
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244 | } |
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245 | |
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246 | ConstantExpr * ConstantExpr::from_bool( const CodeLocation & loc, bool b ) { |
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247 | return new ConstantExpr{ |
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248 | loc, new BasicType{ BasicKind::Bool }, b ? "1" : "0", (unsigned long long)b }; |
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249 | } |
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250 | |
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251 | ConstantExpr * ConstantExpr::from_int( const CodeLocation & loc, int i ) { |
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252 | return new ConstantExpr{ |
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253 | loc, new BasicType{ BasicKind::SignedInt }, std::to_string( i ), (unsigned long long)i }; |
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254 | } |
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255 | |
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256 | ConstantExpr * ConstantExpr::from_ulong( const CodeLocation & loc, unsigned long i ) { |
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257 | return new ConstantExpr{ |
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258 | loc, new BasicType{ BasicKind::LongUnsignedInt }, std::to_string( i ), |
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259 | (unsigned long long)i }; |
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260 | } |
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261 | |
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262 | ConstantExpr * ConstantExpr::from_string( const CodeLocation & loc, const std::string & str ) { |
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263 | const Type * charType = new BasicType( BasicKind::Char, ast::CV::Const ); |
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264 | // Adjust the length of the string for the terminator. |
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265 | const Expr * strSize = from_ulong( loc, str.size() + 1 ); |
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266 | const Type * strType = new ArrayType( charType, strSize, FixedLen, DynamicDim ); |
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267 | const std::string strValue = "\"" + str + "\""; |
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268 | return new ConstantExpr( loc, strType, strValue, std::nullopt ); |
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269 | } |
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270 | |
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271 | ConstantExpr * ConstantExpr::null( const CodeLocation & loc, const Type * ptrType ) { |
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272 | return new ConstantExpr{ |
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273 | loc, ptrType ? ptrType : new PointerType{ new VoidType{} }, "0", (unsigned long long)0 }; |
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274 | } |
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275 | |
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276 | // --- SizeofExpr |
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277 | |
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278 | SizeofExpr::SizeofExpr( const CodeLocation & loc, const Expr * e ) |
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279 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), expr( e ), type( nullptr ) {} |
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280 | |
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281 | SizeofExpr::SizeofExpr( const CodeLocation & loc, const Type * t ) |
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282 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), expr( nullptr ), type( t ) {} |
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283 | |
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284 | // --- CountExpr |
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285 | |
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286 | CountExpr::CountExpr( const CodeLocation & loc, const Type * t ) |
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287 | : Expr( loc, new BasicType( BasicKind::LongUnsignedInt) ), type( t ) {} |
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288 | |
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289 | // --- AlignofExpr |
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290 | |
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291 | AlignofExpr::AlignofExpr( const CodeLocation & loc, const Expr * e ) |
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292 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), expr( e ), type( nullptr ) {} |
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293 | |
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294 | AlignofExpr::AlignofExpr( const CodeLocation & loc, const Type * t ) |
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295 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), expr( nullptr ), type( t ) {} |
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296 | |
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297 | // --- OffsetofExpr |
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298 | |
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299 | OffsetofExpr::OffsetofExpr( const CodeLocation & loc, const Type * ty, const DeclWithType * mem ) |
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300 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), type( ty ), member( mem ) { |
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301 | assert( type ); |
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302 | assert( member ); |
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303 | } |
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304 | |
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305 | // --- OffsetPackExpr |
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306 | |
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307 | OffsetPackExpr::OffsetPackExpr( const CodeLocation & loc, const StructInstType * ty ) |
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308 | : Expr( loc, new ArrayType{ |
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309 | new BasicType{ BasicKind::LongUnsignedInt }, nullptr, FixedLen, DynamicDim } |
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310 | ), type( ty ) { |
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311 | assert( type ); |
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312 | } |
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313 | |
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314 | // --- LogicalExpr |
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315 | |
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316 | LogicalExpr::LogicalExpr( |
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317 | const CodeLocation & loc, const Expr * a1, const Expr * a2, LogicalFlag ia ) |
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318 | : Expr( loc, new BasicType{ BasicKind::SignedInt } ), arg1( a1 ), arg2( a2 ), isAnd( ia ) {} |
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319 | |
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320 | // --- CommaExpr |
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321 | bool CommaExpr::get_lvalue() const { |
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322 | // This is wrong by C, but the current implementation uses it. |
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323 | // (ex: Specialize, Lvalue and Box) |
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324 | return arg2->get_lvalue(); |
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325 | } |
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326 | |
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327 | // --- ConstructorExpr |
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328 | |
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329 | ConstructorExpr::ConstructorExpr( const CodeLocation & loc, const Expr * call ) |
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330 | : Expr( loc ), callExpr( call ) { |
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331 | // allow resolver to type a constructor used as an expression if it has the same type as its |
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332 | // first argument |
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333 | assert( callExpr ); |
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334 | const Expr * arg = getCallArg( callExpr, 0 ); |
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335 | assert( arg ); |
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336 | result = arg->result; |
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337 | } |
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338 | |
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339 | // --- CompoundLiteralExpr |
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340 | |
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341 | CompoundLiteralExpr::CompoundLiteralExpr( const CodeLocation & loc, const Type * t, const Init * i ) |
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342 | : Expr( loc ), init( i ) { |
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343 | assert( t && i ); |
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344 | result = t; |
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345 | } |
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346 | |
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347 | bool CompoundLiteralExpr::get_lvalue() const { |
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348 | return true; |
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349 | } |
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350 | |
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351 | // --- TupleExpr |
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352 | |
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353 | TupleExpr::TupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs ) |
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354 | : Expr( loc, Tuples::makeTupleType( xs ) ), exprs( xs ) {} |
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355 | |
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356 | // --- TupleIndexExpr |
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357 | |
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358 | TupleIndexExpr::TupleIndexExpr( const CodeLocation & loc, const Expr * t, unsigned i ) |
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359 | : Expr( loc ), tuple( t ), index( i ) { |
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360 | const TupleType * type = strict_dynamic_cast< const TupleType * >( tuple->result.get() ); |
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361 | assertf( type->size() > index, "TupleIndexExpr index out of bounds: tuple size %d, requested " |
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362 | "index %d in expr %s", type->size(), index, toString( tuple ).c_str() ); |
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363 | // like MemberExpr, TupleIndexExpr is always an lvalue |
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364 | result = type->types[ index ]; |
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365 | } |
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366 | |
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367 | bool TupleIndexExpr::get_lvalue() const { |
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368 | return tuple->get_lvalue(); |
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369 | } |
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370 | |
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371 | // --- TupleAssignExpr |
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372 | |
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373 | TupleAssignExpr::TupleAssignExpr( |
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374 | const CodeLocation & loc, std::vector<ptr<Expr>> && assigns, |
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375 | std::vector<ptr<ObjectDecl>> && tempDecls ) |
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376 | : Expr( loc, Tuples::makeTupleType( assigns ) ), stmtExpr() { |
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377 | // convert internally into a StmtExpr which contains the declarations and produces the tuple of |
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378 | // the assignments |
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379 | std::list<ptr<Stmt>> stmts; |
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380 | for ( const ObjectDecl * obj : tempDecls ) { |
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381 | stmts.emplace_back( new DeclStmt{ loc, obj } ); |
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382 | } |
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383 | TupleExpr * tupleExpr = new TupleExpr{ loc, std::move(assigns) }; |
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384 | assert( tupleExpr->result ); |
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385 | stmts.emplace_back( new ExprStmt{ loc, tupleExpr } ); |
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386 | stmtExpr = new StmtExpr{ loc, new CompoundStmt{ loc, std::move(stmts) } }; |
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387 | } |
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388 | |
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389 | // --- StmtExpr |
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390 | |
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391 | StmtExpr::StmtExpr( const CodeLocation & loc, const CompoundStmt * ss ) |
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392 | : Expr( loc ), stmts( ss ), returnDecls(), dtors() { computeResult(); } |
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393 | |
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394 | void StmtExpr::computeResult() { |
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395 | assert( stmts ); |
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396 | const std::list<ptr<Stmt>> & body = stmts->kids; |
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397 | if ( ! returnDecls.empty() ) { |
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398 | // prioritize return decl for result type, since if a return decl exists, then the StmtExpr |
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399 | // is currently in an intermediate state where the body will always give a void result type |
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400 | result = returnDecls.front()->get_type(); |
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401 | } else if ( ! body.empty() ) { |
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402 | if ( const ExprStmt * exprStmt = body.back().as< ExprStmt >() ) { |
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403 | result = exprStmt->expr->result; |
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404 | } |
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405 | } |
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406 | // ensure a result type exists |
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407 | if ( ! result ) { result = new VoidType{}; } |
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408 | } |
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409 | |
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410 | // --- UniqueExpr |
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411 | |
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412 | unsigned long long UniqueExpr::nextId = 0; |
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413 | |
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414 | UniqueExpr::UniqueExpr( const CodeLocation & loc, const Expr * e, unsigned long long i ) |
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415 | : Expr( loc, e->result ), expr( e ), id( i ) { |
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416 | assert( expr ); |
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417 | if ( id == -1ull ) { |
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418 | assert( nextId != -1ull ); |
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419 | id = nextId++; |
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420 | } |
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421 | } |
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422 | |
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423 | } |
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424 | |
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425 | // Local Variables: // |
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426 | // tab-width: 4 // |
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427 | // mode: c++ // |
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428 | // compile-command: "make install" // |
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429 | // End: // |
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