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 | // Mangler.cc -- |
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8 | // |
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9 | // Author : Richard C. Bilson |
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10 | // Created On : Sun May 17 21:40:29 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Mon Sep 25 15:49:26 2017 |
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13 | // Update Count : 23 |
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14 | // |
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15 | #include "Mangler.h" |
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16 | |
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17 | #include <algorithm> // for copy, transform |
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18 | #include <cassert> // for assert, assertf |
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19 | #include <functional> // for const_mem_fun_t, mem_fun |
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20 | #include <iterator> // for ostream_iterator, back_insert_ite... |
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21 | #include <list> // for _List_iterator, list, _List_const... |
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22 | #include <string> // for string, char_traits, operator<< |
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23 | |
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24 | #include "CodeGen/OperatorTable.h" // for OperatorInfo, operatorLookup |
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25 | #include "Common/PassVisitor.h" |
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26 | #include "Common/SemanticError.h" // for SemanticError |
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27 | #include "Common/utility.h" // for toString |
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28 | #include "Parser/LinkageSpec.h" // for Spec, isOverridable, AutoGen, Int... |
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29 | #include "ResolvExpr/TypeEnvironment.h" // for TypeEnvironment |
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30 | #include "SynTree/Declaration.h" // for TypeDecl, DeclarationWithType |
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31 | #include "SynTree/Expression.h" // for TypeExpr, Expression, operator<< |
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32 | #include "SynTree/Type.h" // for Type, ReferenceToType, Type::Fora... |
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33 | |
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34 | namespace SymTab { |
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35 | namespace Mangler { |
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36 | namespace { |
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37 | /// Mangles names to a unique C identifier |
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38 | struct Mangler : public WithShortCircuiting, public WithVisitorRef<Mangler>, public WithGuards { |
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39 | Mangler( bool mangleOverridable, bool typeMode, bool mangleGenericParams ); |
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40 | Mangler( const ResolvExpr::TypeEnvironment& env ); |
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41 | Mangler( const Mangler & ) = delete; |
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42 | |
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43 | void previsit( BaseSyntaxNode * ) { visit_children = false; } |
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44 | |
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45 | void postvisit( ObjectDecl * declaration ); |
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46 | void postvisit( FunctionDecl * declaration ); |
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47 | void postvisit( TypeDecl * declaration ); |
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48 | |
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49 | void postvisit( VoidType * voidType ); |
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50 | void postvisit( BasicType * basicType ); |
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51 | void postvisit( PointerType * pointerType ); |
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52 | void postvisit( ArrayType * arrayType ); |
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53 | void postvisit( ReferenceType * refType ); |
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54 | void postvisit( FunctionType * functionType ); |
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55 | void postvisit( StructInstType * aggregateUseType ); |
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56 | void postvisit( UnionInstType * aggregateUseType ); |
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57 | void postvisit( EnumInstType * aggregateUseType ); |
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58 | void postvisit( TypeInstType * aggregateUseType ); |
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59 | void postvisit( TraitInstType * inst ); |
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60 | void postvisit( TupleType * tupleType ); |
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61 | void postvisit( VarArgsType * varArgsType ); |
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62 | void postvisit( ZeroType * zeroType ); |
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63 | void postvisit( OneType * oneType ); |
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64 | void postvisit( QualifiedType * qualType ); |
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65 | |
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66 | std::string get_mangleName() { return mangleName.str(); } |
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67 | private: |
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68 | std::ostringstream mangleName; ///< Mangled name being constructed |
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69 | typedef std::map< std::string, std::pair< std::string, int > > VarMapType; |
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70 | VarMapType varNums; ///< Map of type variables to indices |
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71 | int nextVarNum; ///< Next type variable index |
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72 | const ResolvExpr::TypeEnvironment* env; ///< optional environment for substitutions |
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73 | bool isTopLevel; ///< Is the Mangler at the top level |
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74 | bool mangleOverridable; ///< Specially mangle overridable built-in methods |
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75 | bool typeMode; ///< Produce a unique mangled name for a type |
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76 | bool mangleGenericParams; ///< Include generic parameters in name mangling if true |
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77 | bool inFunctionType = false; ///< Include type qualifiers if false. |
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78 | bool inQualifiedType = false; ///< Add start/end delimiters around qualified type |
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79 | |
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80 | public: |
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81 | Mangler( bool mangleOverridable, bool typeMode, bool mangleGenericParams, |
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82 | int nextVarNum, const ResolvExpr::TypeEnvironment* env, |
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83 | const VarMapType& varNums ); |
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84 | |
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85 | private: |
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86 | void mangleDecl( DeclarationWithType *declaration ); |
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87 | void mangleRef( ReferenceToType *refType, std::string prefix ); |
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88 | |
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89 | void printQualifiers( Type *type ); |
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90 | }; // Mangler |
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91 | } // namespace |
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92 | |
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93 | std::string mangle( BaseSyntaxNode * decl, bool mangleOverridable, bool typeMode, bool mangleGenericParams ) { |
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94 | PassVisitor<Mangler> mangler( mangleOverridable, typeMode, mangleGenericParams ); |
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95 | maybeAccept( decl, mangler ); |
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96 | return mangler.pass.get_mangleName(); |
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97 | } |
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98 | |
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99 | std::string mangleType( Type * ty ) { |
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100 | PassVisitor<Mangler> mangler( false, true, true ); |
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101 | maybeAccept( ty, mangler ); |
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102 | return mangler.pass.get_mangleName(); |
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103 | } |
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104 | |
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105 | std::string mangleConcrete( Type * ty ) { |
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106 | PassVisitor<Mangler> mangler( false, false, false ); |
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107 | maybeAccept( ty, mangler ); |
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108 | return mangler.pass.get_mangleName(); |
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109 | } |
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110 | |
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111 | std::string mangleAssnKey( DeclarationWithType* decl, |
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112 | const ResolvExpr::TypeEnvironment& env ) { |
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113 | PassVisitor<Mangler> mangler( env ); |
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114 | maybeAccept( decl, mangler ); |
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115 | return mangler.pass.get_mangleName(); |
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116 | } |
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117 | |
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118 | namespace { |
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119 | Mangler::Mangler( bool mangleOverridable, bool typeMode, bool mangleGenericParams ) |
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120 | : nextVarNum( 0 ), env(nullptr), isTopLevel( true ), |
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121 | mangleOverridable( mangleOverridable ), typeMode( typeMode ), |
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122 | mangleGenericParams( mangleGenericParams ) {} |
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123 | |
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124 | Mangler::Mangler( const ResolvExpr::TypeEnvironment& env ) |
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125 | : nextVarNum( 0 ), env( &env ), isTopLevel( true ), mangleOverridable( false ), |
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126 | typeMode( false ), mangleGenericParams( true ) {} |
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127 | |
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128 | Mangler::Mangler( bool mangleOverridable, bool typeMode, bool mangleGenericParams, |
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129 | int nextVarNum, const ResolvExpr::TypeEnvironment* env, |
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130 | const VarMapType& varNums ) |
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131 | : varNums( varNums ), nextVarNum( nextVarNum ), env( env ), isTopLevel( false ), |
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132 | mangleOverridable( mangleOverridable ), typeMode( typeMode ), |
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133 | mangleGenericParams( mangleGenericParams ) {} |
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134 | |
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135 | void Mangler::mangleDecl( DeclarationWithType * declaration ) { |
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136 | bool wasTopLevel = isTopLevel; |
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137 | if ( isTopLevel ) { |
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138 | varNums.clear(); |
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139 | nextVarNum = 0; |
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140 | isTopLevel = false; |
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141 | } // if |
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142 | mangleName << Encoding::manglePrefix; |
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143 | CodeGen::OperatorInfo opInfo; |
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144 | if ( operatorLookup( declaration->get_name(), opInfo ) ) { |
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145 | mangleName << opInfo.outputName.size() << opInfo.outputName; |
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146 | } else { |
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147 | mangleName << declaration->name.size() << declaration->name; |
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148 | } // if |
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149 | maybeAccept( declaration->get_type(), *visitor ); |
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150 | if ( mangleOverridable && LinkageSpec::isOverridable( declaration->get_linkage() ) ) { |
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151 | // want to be able to override autogenerated and intrinsic routines, |
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152 | // so they need a different name mangling |
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153 | if ( declaration->get_linkage() == LinkageSpec::AutoGen ) { |
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154 | mangleName << Encoding::autogen; |
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155 | } else if ( declaration->get_linkage() == LinkageSpec::Intrinsic ) { |
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156 | mangleName << Encoding::intrinsic; |
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157 | } else { |
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158 | // if we add another kind of overridable function, this has to change |
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159 | assert( false && "unknown overrideable linkage" ); |
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160 | } // if |
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161 | } |
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162 | isTopLevel = wasTopLevel; |
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163 | } |
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164 | |
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165 | void Mangler::postvisit( ObjectDecl * declaration ) { |
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166 | mangleDecl( declaration ); |
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167 | } |
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168 | |
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169 | void Mangler::postvisit( FunctionDecl * declaration ) { |
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170 | mangleDecl( declaration ); |
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171 | } |
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172 | |
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173 | void Mangler::postvisit( VoidType * voidType ) { |
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174 | printQualifiers( voidType ); |
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175 | mangleName << Encoding::void_t; |
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176 | } |
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177 | |
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178 | void Mangler::postvisit( BasicType * basicType ) { |
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179 | printQualifiers( basicType ); |
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180 | assertf( basicType->get_kind() < BasicType::NUMBER_OF_BASIC_TYPES, "Unhandled basic type: %d", basicType->get_kind() ); |
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181 | mangleName << Encoding::basicTypes[ basicType->get_kind() ]; |
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182 | } |
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183 | |
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184 | void Mangler::postvisit( PointerType * pointerType ) { |
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185 | printQualifiers( pointerType ); |
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186 | // mangle void (*f)() and void f() to the same name to prevent overloading on functions and function pointers |
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187 | if ( ! dynamic_cast<FunctionType *>( pointerType->base ) ) mangleName << Encoding::pointer; |
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188 | maybeAccept( pointerType->base, *visitor ); |
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189 | } |
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190 | |
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191 | void Mangler::postvisit( ArrayType * arrayType ) { |
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192 | // TODO: encode dimension |
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193 | printQualifiers( arrayType ); |
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194 | mangleName << Encoding::array << "0"; |
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195 | maybeAccept( arrayType->base, *visitor ); |
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196 | } |
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197 | |
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198 | void Mangler::postvisit( ReferenceType * refType ) { |
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199 | // don't print prefix (e.g. 'R') for reference types so that references and non-references do not overload. |
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200 | // Further, do not print the qualifiers for a reference type (but do run printQualifers because of TypeDecls, etc.), |
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201 | // by pretending every reference type is a function parameter. |
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202 | GuardValue( inFunctionType ); |
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203 | inFunctionType = true; |
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204 | printQualifiers( refType ); |
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205 | maybeAccept( refType->base, *visitor ); |
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206 | } |
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207 | |
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208 | namespace { |
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209 | inline std::list< Type* > getTypes( const std::list< DeclarationWithType* > decls ) { |
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210 | std::list< Type* > ret; |
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211 | std::transform( decls.begin(), decls.end(), std::back_inserter( ret ), |
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212 | std::mem_fun( &DeclarationWithType::get_type ) ); |
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213 | return ret; |
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214 | } |
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215 | } |
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216 | |
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217 | void Mangler::postvisit( FunctionType * functionType ) { |
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218 | printQualifiers( functionType ); |
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219 | mangleName << Encoding::function; |
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220 | // turn on inFunctionType so that printQualifiers does not print most qualifiers for function parameters, |
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221 | // since qualifiers on outermost parameter type do not differentiate function types, e.g., |
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222 | // void (*)(const int) and void (*)(int) are the same type, but void (*)(const int *) and void (*)(int *) are different |
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223 | GuardValue( inFunctionType ); |
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224 | inFunctionType = true; |
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225 | std::list< Type* > returnTypes = getTypes( functionType->returnVals ); |
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226 | if (returnTypes.empty()) mangleName << Encoding::void_t; |
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227 | else acceptAll( returnTypes, *visitor ); |
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228 | mangleName << "_"; |
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229 | std::list< Type* > paramTypes = getTypes( functionType->parameters ); |
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230 | acceptAll( paramTypes, *visitor ); |
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231 | mangleName << "_"; |
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232 | } |
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233 | |
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234 | void Mangler::mangleRef( ReferenceToType * refType, std::string prefix ) { |
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235 | printQualifiers( refType ); |
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236 | |
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237 | mangleName << prefix << refType->name.length() << refType->name; |
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238 | |
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239 | if ( mangleGenericParams ) { |
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240 | std::list< Expression* >& params = refType->parameters; |
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241 | if ( ! params.empty() ) { |
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242 | mangleName << "_"; |
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243 | for ( std::list< Expression* >::const_iterator param = params.begin(); param != params.end(); ++param ) { |
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244 | TypeExpr *paramType = dynamic_cast< TypeExpr* >( *param ); |
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245 | assertf(paramType, "Aggregate parameters should be type expressions: %s", toCString(*param)); |
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246 | maybeAccept( paramType->type, *visitor ); |
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247 | } |
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248 | mangleName << "_"; |
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249 | } |
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250 | } |
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251 | } |
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252 | |
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253 | void Mangler::postvisit( StructInstType * aggregateUseType ) { |
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254 | mangleRef( aggregateUseType, Encoding::struct_t ); |
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255 | } |
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256 | |
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257 | void Mangler::postvisit( UnionInstType * aggregateUseType ) { |
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258 | mangleRef( aggregateUseType, Encoding::union_t ); |
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259 | } |
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260 | |
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261 | void Mangler::postvisit( EnumInstType * aggregateUseType ) { |
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262 | mangleRef( aggregateUseType, Encoding::enum_t ); |
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263 | } |
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264 | |
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265 | void Mangler::postvisit( TypeInstType * typeInst ) { |
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266 | VarMapType::iterator varNum = varNums.find( typeInst->get_name() ); |
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267 | if ( varNum == varNums.end() ) { |
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268 | mangleRef( typeInst, Encoding::type ); |
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269 | } else { |
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270 | printQualifiers( typeInst ); |
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271 | // Note: Can't use name here, since type variable names do not actually disambiguate a function, e.g. |
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272 | // forall(dtype T) void f(T); |
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273 | // forall(dtype S) void f(S); |
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274 | // are equivalent and should mangle the same way. This is accomplished by numbering the type variables when they |
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275 | // are first found and prefixing with the appropriate encoding for the type class. |
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276 | assertf( varNum->second.second < TypeDecl::NUMBER_OF_KINDS, "Unhandled type variable kind: %d", varNum->second.second ); |
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277 | mangleName << Encoding::typeVariables[varNum->second.second] << varNum->second.first; |
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278 | } // if |
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279 | } |
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280 | |
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281 | void Mangler::postvisit( TraitInstType * inst ) { |
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282 | printQualifiers( inst ); |
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283 | mangleName << inst->name.size() << inst->name; |
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284 | } |
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285 | |
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286 | void Mangler::postvisit( TupleType * tupleType ) { |
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287 | printQualifiers( tupleType ); |
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288 | mangleName << Encoding::tuple << tupleType->types.size(); |
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289 | acceptAll( tupleType->types, *visitor ); |
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290 | } |
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291 | |
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292 | void Mangler::postvisit( VarArgsType * varArgsType ) { |
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293 | printQualifiers( varArgsType ); |
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294 | static const std::string vargs = "__builtin_va_list"; |
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295 | mangleName << Encoding::type << vargs.size() << vargs; |
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296 | } |
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297 | |
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298 | void Mangler::postvisit( ZeroType * ) { |
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299 | mangleName << Encoding::zero; |
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300 | } |
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301 | |
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302 | void Mangler::postvisit( OneType * ) { |
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303 | mangleName << Encoding::one; |
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304 | } |
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305 | |
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306 | void Mangler::postvisit( QualifiedType * qualType ) { |
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307 | bool inqual = inQualifiedType; |
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308 | if (! inqual ) { |
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309 | // N marks the start of a qualified type |
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310 | inQualifiedType = true; |
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311 | mangleName << Encoding::qualifiedTypeStart; |
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312 | } |
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313 | maybeAccept( qualType->parent, *visitor ); |
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314 | maybeAccept( qualType->child, *visitor ); |
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315 | if ( ! inqual ) { |
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316 | // E marks the end of a qualified type |
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317 | inQualifiedType = false; |
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318 | mangleName << Encoding::qualifiedTypeEnd; |
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319 | } |
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320 | } |
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321 | |
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322 | void Mangler::postvisit( TypeDecl * decl ) { |
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323 | // TODO: is there any case where mangling a TypeDecl makes sense? If so, this code needs to be |
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324 | // fixed to ensure that two TypeDecls mangle to the same name when they are the same type and vice versa. |
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325 | // Note: The current scheme may already work correctly for this case, I have not thought about this deeply |
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326 | // and the case has not yet come up in practice. Alternatively, if not then this code can be removed |
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327 | // aside from the assert false. |
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328 | assertf(false, "Mangler should not visit typedecl: %s", toCString(decl)); |
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329 | assertf( decl->get_kind() < TypeDecl::NUMBER_OF_KINDS, "Unhandled type variable kind: %d", decl->get_kind() ); |
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330 | mangleName << Encoding::typeVariables[ decl->get_kind() ] << ( decl->name.length() ) << decl->name; |
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331 | } |
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332 | |
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333 | __attribute__((unused)) void printVarMap( const std::map< std::string, std::pair< int, int > > &varMap, std::ostream &os ) { |
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334 | for ( std::map< std::string, std::pair< int, int > >::const_iterator i = varMap.begin(); i != varMap.end(); ++i ) { |
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335 | os << i->first << "(" << i->second.first << "/" << i->second.second << ")" << std::endl; |
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336 | } // for |
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337 | } |
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338 | |
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339 | void Mangler::printQualifiers( Type * type ) { |
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340 | // skip if not including qualifiers |
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341 | if ( typeMode ) return; |
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342 | if ( ! type->get_forall().empty() ) { |
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343 | std::list< std::string > assertionNames; |
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344 | int dcount = 0, fcount = 0, vcount = 0, acount = 0; |
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345 | mangleName << Encoding::forall; |
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346 | for ( Type::ForallList::iterator i = type->forall.begin(); i != type->forall.end(); ++i ) { |
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347 | switch ( (*i)->get_kind() ) { |
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348 | case TypeDecl::Dtype: |
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349 | dcount++; |
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350 | break; |
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351 | case TypeDecl::Ftype: |
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352 | fcount++; |
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353 | break; |
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354 | case TypeDecl::Ttype: |
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355 | vcount++; |
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356 | break; |
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357 | default: |
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358 | assert( false ); |
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359 | } // switch |
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360 | std::string varName; |
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361 | // replace type with substitution name if environment is available and bound |
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362 | if ( env ) { |
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363 | const ResolvExpr::EqvClass* varClass = env->lookup( (*i)->name ); |
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364 | if ( varClass && varClass->type ) { |
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365 | PassVisitor<Mangler> sub_mangler( |
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366 | mangleOverridable, typeMode, mangleGenericParams, nextVarNum, |
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367 | env, varNums ); |
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368 | varClass->type->accept( sub_mangler ); |
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369 | varName = std::string{"%"} + sub_mangler.pass.get_mangleName(); |
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370 | } |
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371 | } |
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372 | // otherwise just give type numeric name |
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373 | if ( varName.empty() ) { |
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374 | varName = std::to_string( nextVarNum++ ); |
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375 | } |
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376 | varNums[ (*i)->name ] = std::make_pair( varName, (int)(*i)->get_kind() ); |
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377 | for ( std::list< DeclarationWithType* >::iterator assert = (*i)->assertions.begin(); assert != (*i)->assertions.end(); ++assert ) { |
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378 | PassVisitor<Mangler> sub_mangler( |
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379 | mangleOverridable, typeMode, mangleGenericParams, nextVarNum, env, |
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380 | varNums ); |
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381 | (*assert)->accept( sub_mangler ); |
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382 | assertionNames.push_back( sub_mangler.pass.get_mangleName() ); |
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383 | acount++; |
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384 | } // for |
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385 | } // for |
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386 | mangleName << dcount << "_" << fcount << "_" << vcount << "_" << acount << "_"; |
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387 | std::copy( assertionNames.begin(), assertionNames.end(), std::ostream_iterator< std::string >( mangleName, "" ) ); |
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388 | mangleName << "_"; |
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389 | } // if |
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390 | if ( ! inFunctionType ) { |
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391 | // these qualifiers do not distinguish the outermost type of a function parameter |
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392 | if ( type->get_const() ) { |
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393 | mangleName << Encoding::qualifiers.at(Type::Const); |
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394 | } // if |
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395 | if ( type->get_volatile() ) { |
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396 | mangleName << Encoding::qualifiers.at(Type::Volatile); |
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397 | } // if |
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398 | // Removed due to restrict not affecting function compatibility in GCC |
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399 | // if ( type->get_isRestrict() ) { |
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400 | // mangleName << "E"; |
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401 | // } // if |
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402 | if ( type->get_atomic() ) { |
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403 | mangleName << Encoding::qualifiers.at(Type::Atomic); |
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404 | } // if |
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405 | } |
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406 | if ( type->get_mutex() ) { |
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407 | mangleName << Encoding::qualifiers.at(Type::Mutex); |
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408 | } // if |
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409 | if ( type->get_lvalue() ) { |
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410 | // mangle based on whether the type is lvalue, so that the resolver can differentiate lvalues and rvalues |
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411 | mangleName << Encoding::qualifiers.at(Type::Lvalue); |
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412 | } |
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413 | |
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414 | if ( inFunctionType ) { |
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415 | // turn off inFunctionType so that types can be differentiated for nested qualifiers |
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416 | GuardValue( inFunctionType ); |
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417 | inFunctionType = false; |
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418 | } |
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419 | } |
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420 | } // namespace |
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421 | } // namespace Mangler |
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422 | } // namespace SymTab |
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423 | |
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424 | // Local Variables: // |
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425 | // tab-width: 4 // |
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426 | // mode: c++ // |
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427 | // compile-command: "make install" // |
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428 | // End: // |
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