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 | // Unify.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 12:27:10 2015 |
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11 | // Last Modified By : Rob Schluntz |
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12 | // Last Modified On : Wed Sep 02 14:43:22 2015 |
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13 | // Update Count : 36 |
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14 | // |
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15 | |
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16 | #include <set> |
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17 | #include <memory> |
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18 | |
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19 | #include "Unify.h" |
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20 | #include "TypeEnvironment.h" |
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21 | #include "typeops.h" |
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22 | #include "FindOpenVars.h" |
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23 | #include "SynTree/Visitor.h" |
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24 | #include "SynTree/Type.h" |
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25 | #include "SynTree/Declaration.h" |
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26 | #include "SymTab/Indexer.h" |
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27 | #include "utility.h" |
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28 | |
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29 | |
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30 | // #define DEBUG |
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31 | |
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32 | namespace ResolvExpr { |
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33 | struct WidenMode { |
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34 | WidenMode( bool widenFirst, bool widenSecond ): widenFirst( widenFirst ), widenSecond( widenSecond ) {} |
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35 | WidenMode &operator|=( const WidenMode &other ) { widenFirst |= other.widenFirst; widenSecond |= other.widenSecond; return *this; } |
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36 | WidenMode &operator&=( const WidenMode &other ) { widenFirst &= other.widenFirst; widenSecond &= other.widenSecond; return *this; } |
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37 | WidenMode operator|( const WidenMode &other ) { WidenMode newWM( *this ); newWM |= other; return newWM; } |
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38 | WidenMode operator&( const WidenMode &other ) { WidenMode newWM( *this ); newWM &= other; return newWM; } |
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39 | operator bool() { return widenFirst && widenSecond; } |
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40 | |
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41 | bool widenFirst : 1, widenSecond : 1; |
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42 | }; |
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43 | |
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44 | class Unify : public Visitor { |
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45 | public: |
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46 | Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ); |
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47 | |
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48 | bool get_result() const { return result; } |
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49 | private: |
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50 | virtual void visit(VoidType *voidType); |
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51 | virtual void visit(BasicType *basicType); |
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52 | virtual void visit(PointerType *pointerType); |
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53 | virtual void visit(ArrayType *arrayType); |
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54 | virtual void visit(FunctionType *functionType); |
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55 | virtual void visit(StructInstType *aggregateUseType); |
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56 | virtual void visit(UnionInstType *aggregateUseType); |
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57 | virtual void visit(EnumInstType *aggregateUseType); |
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58 | virtual void visit(ContextInstType *aggregateUseType); |
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59 | virtual void visit(TypeInstType *aggregateUseType); |
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60 | virtual void visit(TupleType *tupleType); |
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61 | |
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62 | template< typename RefType > void handleRefType( RefType *inst, Type *other ); |
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63 | template< typename RefType > void handleGenericRefType( RefType *inst, Type *other ); |
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64 | |
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65 | bool result; |
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66 | Type *type2; // inherited |
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67 | TypeEnvironment &env; |
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68 | AssertionSet &needAssertions; |
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69 | AssertionSet &haveAssertions; |
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70 | const OpenVarSet &openVars; |
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71 | WidenMode widenMode; |
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72 | Type *commonType; |
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73 | const SymTab::Indexer &indexer; |
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74 | }; |
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75 | |
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76 | /// Attempts an inexact unification of type1 and type2. |
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77 | /// Returns false if no such unification; if the types can be unified, sets common (unless they unify exactly and have identical type qualifiers) |
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78 | bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer, Type *&common ); |
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79 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ); |
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80 | |
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81 | bool typesCompatible( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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82 | TypeEnvironment newEnv; |
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83 | OpenVarSet openVars, closedVars; // added closedVars |
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84 | AssertionSet needAssertions, haveAssertions; |
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85 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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86 | env.apply( newFirst ); |
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87 | env.apply( newSecond ); |
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88 | |
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89 | // do we need to do this? Seems like we do, types should be able to be compatible if they |
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90 | // have free variables that can unify |
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91 | findOpenVars( newFirst, openVars, closedVars, needAssertions, haveAssertions, false ); |
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92 | findOpenVars( newSecond, openVars, closedVars, needAssertions, haveAssertions, true ); |
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93 | |
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94 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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95 | delete newFirst; |
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96 | delete newSecond; |
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97 | return result; |
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98 | } |
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99 | |
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100 | bool typesCompatibleIgnoreQualifiers( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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101 | TypeEnvironment newEnv; |
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102 | OpenVarSet openVars; |
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103 | AssertionSet needAssertions, haveAssertions; |
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104 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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105 | env.apply( newFirst ); |
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106 | env.apply( newSecond ); |
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107 | newFirst->get_qualifiers() = Type::Qualifiers(); |
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108 | newSecond->get_qualifiers() = Type::Qualifiers(); |
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109 | /// std::cout << "first is "; |
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110 | /// first->print( std::cout ); |
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111 | /// std::cout << std::endl << "second is "; |
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112 | /// second->print( std::cout ); |
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113 | /// std::cout << std::endl << "newFirst is "; |
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114 | /// newFirst->print( std::cout ); |
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115 | /// std::cout << std::endl << "newSecond is "; |
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116 | /// newSecond->print( std::cout ); |
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117 | /// std::cout << std::endl; |
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118 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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119 | delete newFirst; |
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120 | delete newSecond; |
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121 | return result; |
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122 | } |
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123 | |
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124 | bool isFtype( Type *type, const SymTab::Indexer &indexer ) { |
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125 | if ( dynamic_cast< FunctionType* >( type ) ) { |
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126 | return true; |
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127 | } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( type ) ) { |
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128 | return typeInst->get_isFtype(); |
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129 | } // if |
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130 | return false; |
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131 | } |
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132 | |
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133 | bool tyVarCompatible( TypeDecl::Kind kind, Type *type, const SymTab::Indexer &indexer ) { |
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134 | switch ( kind ) { |
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135 | case TypeDecl::Any: |
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136 | case TypeDecl::Dtype: |
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137 | return ! isFtype( type, indexer ); |
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138 | |
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139 | case TypeDecl::Ftype: |
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140 | return isFtype( type, indexer ); |
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141 | } // switch |
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142 | assert( false ); |
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143 | return false; |
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144 | } |
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145 | |
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146 | bool bindVar( TypeInstType *typeInst, Type *other, TypeDecl::Kind kind, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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147 | OpenVarSet::const_iterator tyvar = openVars.find( typeInst->get_name() ); |
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148 | assert( tyvar != openVars.end() ); |
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149 | if ( ! tyVarCompatible( tyvar->second, other, indexer ) ) { |
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150 | return false; |
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151 | } // if |
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152 | if ( occurs( other, typeInst->get_name(), env ) ) { |
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153 | return false; |
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154 | } // if |
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155 | EqvClass curClass; |
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156 | if ( env.lookup( typeInst->get_name(), curClass ) ) { |
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157 | if ( curClass.type ) { |
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158 | Type *common = 0; |
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159 | // attempt to unify equivalence class type (which has qualifiers stripped, so they must be restored) with the type to bind to |
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160 | std::auto_ptr< Type > newType( curClass.type->clone() ); |
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161 | newType->get_qualifiers() = typeInst->get_qualifiers(); |
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162 | if ( unifyInexact( newType.get(), other, env, needAssertions, haveAssertions, openVars, widenMode & WidenMode( curClass.allowWidening, true ), indexer, common ) ) { |
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163 | if ( common ) { |
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164 | common->get_qualifiers() = Type::Qualifiers(); |
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165 | delete curClass.type; |
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166 | curClass.type = common; |
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167 | env.add( curClass ); |
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168 | } // if |
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169 | return true; |
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170 | } else { |
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171 | return false; |
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172 | } // if |
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173 | } else { |
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174 | curClass.type = other->clone(); |
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175 | curClass.type->get_qualifiers() = Type::Qualifiers(); |
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176 | curClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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177 | env.add( curClass ); |
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178 | } // if |
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179 | } else { |
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180 | EqvClass newClass; |
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181 | newClass.vars.insert( typeInst->get_name() ); |
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182 | newClass.type = other->clone(); |
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183 | newClass.type->get_qualifiers() = Type::Qualifiers(); |
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184 | newClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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185 | newClass.kind = kind; |
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186 | env.add( newClass ); |
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187 | } // if |
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188 | return true; |
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189 | } |
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190 | |
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191 | bool bindVarToVar( TypeInstType *var1, TypeInstType *var2, TypeDecl::Kind kind, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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192 | bool result = true; |
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193 | EqvClass class1, class2; |
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194 | bool hasClass1 = false, hasClass2 = false; |
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195 | bool widen1 = false, widen2 = false; |
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196 | Type *type1 = 0, *type2 = 0; |
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197 | |
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198 | if ( env.lookup( var1->get_name(), class1 ) ) { |
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199 | hasClass1 = true; |
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200 | if ( class1.type ) { |
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201 | if ( occurs( class1.type, var2->get_name(), env ) ) { |
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202 | return false; |
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203 | } // if |
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204 | type1 = class1.type->clone(); |
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205 | } // if |
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206 | widen1 = widenMode.widenFirst && class1.allowWidening; |
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207 | } // if |
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208 | if ( env.lookup( var2->get_name(), class2 ) ) { |
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209 | hasClass2 = true; |
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210 | if ( class2.type ) { |
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211 | if ( occurs( class2.type, var1->get_name(), env ) ) { |
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212 | return false; |
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213 | } // if |
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214 | type2 = class2.type->clone(); |
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215 | } // if |
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216 | widen2 = widenMode.widenSecond && class2.allowWidening; |
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217 | } // if |
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218 | |
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219 | if ( type1 && type2 ) { |
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220 | // std::cout << "has type1 && type2" << std::endl; |
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221 | WidenMode newWidenMode ( widen1, widen2 ); |
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222 | Type *common = 0; |
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223 | if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, newWidenMode, indexer, common ) ) { |
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224 | class1.vars.insert( class2.vars.begin(), class2.vars.end() ); |
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225 | class1.allowWidening = widen1 && widen2; |
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226 | if ( common ) { |
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227 | common->get_qualifiers() = Type::Qualifiers(); |
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228 | delete class1.type; |
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229 | class1.type = common; |
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230 | } // if |
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231 | env.add( class1 ); |
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232 | } else { |
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233 | result = false; |
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234 | } // if |
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235 | } else if ( hasClass1 && hasClass2 ) { |
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236 | if ( type1 ) { |
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237 | class1.vars.insert( class2.vars.begin(), class2.vars.end() ); |
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238 | class1.allowWidening = widen1; |
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239 | env.add( class1 ); |
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240 | } else { |
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241 | class2.vars.insert( class1.vars.begin(), class1.vars.end() ); |
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242 | class2.allowWidening = widen2; |
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243 | env.add( class2 ); |
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244 | } // if |
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245 | } else if ( hasClass1 ) { |
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246 | class1.vars.insert( var2->get_name() ); |
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247 | class1.allowWidening = widen1; |
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248 | env.add( class1 ); |
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249 | } else if ( hasClass2 ) { |
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250 | class2.vars.insert( var1->get_name() ); |
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251 | class2.allowWidening = widen2; |
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252 | env.add( class2 ); |
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253 | } else { |
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254 | EqvClass newClass; |
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255 | newClass.vars.insert( var1->get_name() ); |
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256 | newClass.vars.insert( var2->get_name() ); |
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257 | newClass.allowWidening = widen1 && widen2; |
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258 | newClass.kind = kind; |
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259 | env.add( newClass ); |
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260 | } // if |
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261 | delete type1; |
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262 | delete type2; |
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263 | return result; |
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264 | } |
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265 | |
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266 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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267 | OpenVarSet closedVars; |
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268 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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269 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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270 | Type *commonType = 0; |
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271 | if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) { |
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272 | if ( commonType ) { |
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273 | delete commonType; |
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274 | } // if |
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275 | return true; |
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276 | } else { |
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277 | return false; |
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278 | } // if |
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279 | } |
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280 | |
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281 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, Type *&commonType ) { |
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282 | OpenVarSet closedVars; |
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283 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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284 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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285 | return unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ); |
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286 | } |
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287 | |
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288 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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289 | #ifdef DEBUG |
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290 | TypeEnvironment debugEnv( env ); |
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291 | #endif |
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292 | if ( type1->get_qualifiers() != type2->get_qualifiers() ) { |
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293 | return false; |
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294 | } |
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295 | |
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296 | bool result; |
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297 | TypeInstType *var1 = dynamic_cast< TypeInstType* >( type1 ); |
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298 | TypeInstType *var2 = dynamic_cast< TypeInstType* >( type2 ); |
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299 | OpenVarSet::const_iterator entry1, entry2; |
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300 | if ( var1 ) { |
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301 | entry1 = openVars.find( var1->get_name() ); |
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302 | } // if |
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303 | if ( var2 ) { |
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304 | entry2 = openVars.find( var2->get_name() ); |
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305 | } // if |
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306 | bool isopen1 = var1 && ( entry1 != openVars.end() ); |
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307 | bool isopen2 = var2 && ( entry2 != openVars.end() ); |
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308 | |
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309 | if ( isopen1 && isopen2 && entry1->second == entry2->second ) { |
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310 | result = bindVarToVar( var1, var2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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311 | } else if ( isopen1 ) { |
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312 | result = bindVar( var1, type2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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313 | } else if ( isopen2 ) { |
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314 | result = bindVar( var2, type1, entry2->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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315 | } else { |
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316 | Unify comparator( type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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317 | type1->accept( comparator ); |
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318 | result = comparator.get_result(); |
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319 | } // if |
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320 | #ifdef DEBUG |
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321 | std::cout << "============ unifyExact" << std::endl; |
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322 | std::cout << "type1 is "; |
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323 | type1->print( std::cout ); |
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324 | std::cout << std::endl << "type2 is "; |
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325 | type2->print( std::cout ); |
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326 | std::cout << std::endl << "openVars are "; |
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327 | printOpenVarSet( openVars, std::cout, 8 ); |
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328 | std::cout << std::endl << "input env is " << std::endl; |
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329 | debugEnv.print( std::cout, 8 ); |
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330 | std::cout << std::endl << "result env is " << std::endl; |
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331 | env.print( std::cout, 8 ); |
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332 | std::cout << "result is " << result << std::endl; |
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333 | #endif |
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334 | return result; |
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335 | } |
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336 | |
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337 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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338 | return unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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339 | } |
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340 | |
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341 | bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer, Type *&common ) { |
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342 | Type::Qualifiers tq1 = type1->get_qualifiers(), tq2 = type2->get_qualifiers(); |
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343 | type1->get_qualifiers() = Type::Qualifiers(); |
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344 | type2->get_qualifiers() = Type::Qualifiers(); |
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345 | bool result; |
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346 | #ifdef DEBUG |
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347 | std::cout << "unifyInexact type 1 is "; |
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348 | type1->print( std::cout ); |
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349 | std::cout << "type 2 is "; |
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350 | type2->print( std::cout ); |
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351 | std::cout << std::endl; |
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352 | #endif |
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353 | if ( ! unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ) ) { |
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354 | #ifdef DEBUG |
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355 | std::cout << "unifyInexact: no exact unification found" << std::endl; |
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356 | #endif |
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357 | if ( ( common = commonType( type1, type2, widenMode.widenFirst, widenMode.widenSecond, indexer, env, openVars ) ) ) { |
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358 | common->get_qualifiers() = tq1 + tq2; |
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359 | #ifdef DEBUG |
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360 | std::cout << "unifyInexact: common type is "; |
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361 | common->print( std::cout ); |
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362 | std::cout << std::endl; |
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363 | #endif |
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364 | result = true; |
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365 | } else { |
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366 | #ifdef DEBUG |
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367 | std::cout << "unifyInexact: no common type found" << std::endl; |
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368 | #endif |
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369 | result = false; |
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370 | } // if |
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371 | } else { |
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372 | if ( tq1 != tq2 ) { |
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373 | if ( ( tq1 > tq2 || widenMode.widenFirst ) && ( tq2 > tq1 || widenMode.widenSecond ) ) { |
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374 | common = type1->clone(); |
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375 | common->get_qualifiers() = tq1 + tq2; |
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376 | result = true; |
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377 | } else { |
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378 | result = false; |
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379 | } // if |
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380 | } else { |
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381 | result = true; |
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382 | } // if |
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383 | } // if |
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384 | type1->get_qualifiers() = tq1; |
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385 | type2->get_qualifiers() = tq2; |
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386 | return result; |
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387 | } |
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388 | |
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389 | Unify::Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) |
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390 | : result( false ), type2( type2 ), env( env ), needAssertions( needAssertions ), haveAssertions( haveAssertions ), openVars( openVars ), widenMode( widenMode ), indexer( indexer ) { |
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391 | } |
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392 | |
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393 | void Unify::visit(VoidType *voidType) { |
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394 | result = dynamic_cast< VoidType* >( type2 ); |
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395 | } |
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396 | |
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397 | void Unify::visit(BasicType *basicType) { |
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398 | if ( BasicType *otherBasic = dynamic_cast< BasicType* >( type2 ) ) { |
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399 | result = basicType->get_kind() == otherBasic->get_kind(); |
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400 | } // if |
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401 | } |
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402 | |
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403 | void markAssertionSet( AssertionSet &assertions, DeclarationWithType *assert ) { |
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404 | /// std::cout << "assertion set is" << std::endl; |
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405 | /// printAssertionSet( assertions, std::cout, 8 ); |
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406 | /// std::cout << "looking for "; |
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407 | /// assert->print( std::cout ); |
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408 | /// std::cout << std::endl; |
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409 | AssertionSet::iterator i = assertions.find( assert ); |
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410 | if ( i != assertions.end() ) { |
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411 | /// std::cout << "found it!" << std::endl; |
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412 | i->second = true; |
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413 | } // if |
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414 | } |
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415 | |
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416 | void markAssertions( AssertionSet &assertion1, AssertionSet &assertion2, Type *type ) { |
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417 | for ( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) { |
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418 | for ( std::list< DeclarationWithType* >::const_iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) { |
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419 | markAssertionSet( assertion1, *assert ); |
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420 | markAssertionSet( assertion2, *assert ); |
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421 | } // for |
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422 | } // for |
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423 | } |
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424 | |
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425 | void Unify::visit(PointerType *pointerType) { |
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426 | if ( PointerType *otherPointer = dynamic_cast< PointerType* >( type2 ) ) { |
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427 | result = unifyExact( pointerType->get_base(), otherPointer->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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428 | markAssertions( haveAssertions, needAssertions, pointerType ); |
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429 | markAssertions( haveAssertions, needAssertions, otherPointer ); |
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430 | } // if |
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431 | } |
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432 | |
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433 | void Unify::visit(ArrayType *arrayType) { |
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434 | ArrayType *otherArray = dynamic_cast< ArrayType* >( type2 ); |
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435 | // to unify, array types must both be VLA or both not VLA |
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436 | // and must both have a dimension expression or not have a dimension |
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437 | if ( otherArray && arrayType->get_isVarLen() == otherArray->get_isVarLen() |
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438 | && ((arrayType->get_dimension() != 0 && otherArray->get_dimension() != 0) |
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439 | || (arrayType->get_dimension() == 0 && otherArray->get_dimension() == 0))) { |
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440 | |
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441 | // not positive this is correct in all cases, but it's needed for typedefs |
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442 | if ( arrayType->get_isVarLen() || otherArray->get_isVarLen() ) { |
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443 | return; |
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444 | } |
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445 | |
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446 | if ( ! arrayType->get_isVarLen() && ! otherArray->get_isVarLen() && |
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447 | arrayType->get_dimension() != 0 && otherArray->get_dimension() != 0 ) { |
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448 | ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() ); |
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449 | ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( otherArray->get_dimension() ); |
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450 | assert(ce1 && ce2); |
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451 | |
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452 | Constant * c1 = ce1->get_constant(); |
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453 | Constant * c2 = ce2->get_constant(); |
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454 | |
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455 | if ( c1->get_value() != c2->get_value() ) { |
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456 | // does not unify if the dimension is different |
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457 | return; |
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458 | } |
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459 | } |
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460 | |
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461 | result = unifyExact( arrayType->get_base(), otherArray->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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462 | } // if |
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463 | } |
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464 | |
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465 | template< typename Iterator1, typename Iterator2 > |
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466 | bool unifyDeclList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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467 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
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468 | // Type * commonType; |
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469 | // if ( ! unifyInexact( (*list1Begin)->get_type(), (*list2Begin)->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) { |
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470 | if ( ! unifyExact( (*list1Begin)->get_type(), (*list2Begin)->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
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471 | return false; |
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472 | } // if |
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473 | } // for |
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474 | if ( list1Begin != list1End || list2Begin != list2End ) { |
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475 | return false; |
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476 | } else { |
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477 | return true; |
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478 | } // if |
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479 | } |
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480 | |
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481 | void Unify::visit(FunctionType *functionType) { |
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482 | FunctionType *otherFunction = dynamic_cast< FunctionType* >( type2 ); |
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483 | if ( otherFunction && functionType->get_isVarArgs() == otherFunction->get_isVarArgs() ) { |
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484 | |
---|
485 | if ( unifyDeclList( functionType->get_parameters().begin(), functionType->get_parameters().end(), otherFunction->get_parameters().begin(), otherFunction->get_parameters().end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
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486 | |
---|
487 | if ( unifyDeclList( functionType->get_returnVals().begin(), functionType->get_returnVals().end(), otherFunction->get_returnVals().begin(), otherFunction->get_returnVals().end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
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488 | |
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489 | markAssertions( haveAssertions, needAssertions, functionType ); |
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490 | markAssertions( haveAssertions, needAssertions, otherFunction ); |
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491 | |
---|
492 | result = true; |
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493 | } // if |
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494 | } // if |
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495 | } // if |
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496 | } |
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497 | |
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498 | template< typename RefType > |
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499 | void Unify::handleRefType( RefType *inst, Type *other ) { |
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500 | // check that other type is compatible and named the same |
---|
501 | RefType *otherStruct = dynamic_cast< RefType* >( other ); |
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502 | result = otherStruct && inst->get_name() == otherStruct->get_name(); |
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503 | } |
---|
504 | |
---|
505 | template< typename RefType > |
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506 | void Unify::handleGenericRefType( RefType *inst, Type *other ) { |
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507 | // Check that other type is compatible and named the same |
---|
508 | handleRefType( inst, other ); |
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509 | if ( ! result ) return; |
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510 | // Check that parameters of types unify, if any |
---|
511 | std::list< Expression* > params = inst->get_parameters(); |
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512 | std::list< Expression* > otherParams = ((RefType*)other)->get_parameters(); |
---|
513 | |
---|
514 | std::list< Expression* >::const_iterator it = params.begin(), jt = otherParams.begin(); |
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515 | for ( ; it != params.end() && jt != otherParams.end(); ++it, ++jt ) { |
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516 | TypeExpr *param = dynamic_cast< TypeExpr* >(*it); |
---|
517 | assert(param && "Aggregate parameters should be type expressions"); |
---|
518 | TypeExpr *otherParam = dynamic_cast< TypeExpr* >(*jt); |
---|
519 | assert(otherParam && "Aggregate parameters should be type expressions"); |
---|
520 | |
---|
521 | if ( ! unifyExact( param->get_type(), otherParam->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode(false, false), indexer ) ) { |
---|
522 | result = false; |
---|
523 | return; |
---|
524 | } |
---|
525 | } |
---|
526 | result = ( it == params.end() && jt == otherParams.end() ); |
---|
527 | } |
---|
528 | |
---|
529 | void Unify::visit(StructInstType *structInst) { |
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530 | handleGenericRefType( structInst, type2 ); |
---|
531 | } |
---|
532 | |
---|
533 | void Unify::visit(UnionInstType *unionInst) { |
---|
534 | handleGenericRefType( unionInst, type2 ); |
---|
535 | } |
---|
536 | |
---|
537 | void Unify::visit(EnumInstType *enumInst) { |
---|
538 | handleRefType( enumInst, type2 ); |
---|
539 | } |
---|
540 | |
---|
541 | void Unify::visit(ContextInstType *contextInst) { |
---|
542 | handleRefType( contextInst, type2 ); |
---|
543 | } |
---|
544 | |
---|
545 | void Unify::visit(TypeInstType *typeInst) { |
---|
546 | assert( openVars.find( typeInst->get_name() ) == openVars.end() ); |
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547 | TypeInstType *otherInst = dynamic_cast< TypeInstType* >( type2 ); |
---|
548 | if ( otherInst && typeInst->get_name() == otherInst->get_name() ) { |
---|
549 | result = true; |
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550 | /// } else { |
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551 | /// NamedTypeDecl *nt = indexer.lookupType( typeInst->get_name() ); |
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552 | /// if ( nt ) { |
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553 | /// TypeDecl *type = dynamic_cast< TypeDecl* >( nt ); |
---|
554 | /// assert( type ); |
---|
555 | /// if ( type->get_base() ) { |
---|
556 | /// result = unifyExact( type->get_base(), typeInst, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
557 | /// } |
---|
558 | /// } |
---|
559 | } // if |
---|
560 | } |
---|
561 | |
---|
562 | template< typename Iterator1, typename Iterator2 > |
---|
563 | bool unifyList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
---|
564 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
---|
565 | Type *commonType = 0; |
---|
566 | if ( ! unifyInexact( *list1Begin, *list2Begin, env, needAssertions, haveAssertions, openVars, widenMode, indexer, commonType ) ) { |
---|
567 | return false; |
---|
568 | } |
---|
569 | delete commonType; |
---|
570 | } // for |
---|
571 | if ( list1Begin != list1End || list2Begin != list2End ) { |
---|
572 | return false; |
---|
573 | } else { |
---|
574 | return true; |
---|
575 | } //if |
---|
576 | } |
---|
577 | |
---|
578 | void Unify::visit(TupleType *tupleType) { |
---|
579 | if ( TupleType *otherTuple = dynamic_cast< TupleType* >( type2 ) ) { |
---|
580 | result = unifyList( tupleType->get_types().begin(), tupleType->get_types().end(), otherTuple->get_types().begin(), otherTuple->get_types().end(), env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
---|
581 | } // if |
---|
582 | } |
---|
583 | |
---|
584 | } // namespace ResolvExpr |
---|
585 | |
---|
586 | // Local Variables: // |
---|
587 | // tab-width: 4 // |
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588 | // mode: c++ // |
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589 | // compile-command: "make install" // |
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590 | // End: // |
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