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 | // TupleAssignment.cc -- |
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8 | // |
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9 | // Author : Rodolfo G. Esteves |
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10 | // Created On : Mon May 18 07:44:20 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Mon May 18 15:02:53 2015 |
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13 | // Update Count : 2 |
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14 | // |
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15 | |
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16 | #include <iterator> |
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17 | #include <iostream> |
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18 | #include <cassert> |
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19 | #include "Tuples.h" |
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20 | #include "GenPoly/DeclMutator.h" |
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21 | #include "SynTree/Mutator.h" |
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22 | #include "SynTree/Statement.h" |
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23 | #include "SynTree/Declaration.h" |
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24 | #include "SynTree/Type.h" |
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25 | #include "SynTree/Expression.h" |
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26 | #include "SynTree/Initializer.h" |
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27 | #include "SymTab/Mangler.h" |
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28 | #include "Common/ScopedMap.h" |
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29 | #include "ResolvExpr/typeops.h" |
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30 | #include "InitTweak/GenInit.h" |
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31 | |
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32 | namespace Tuples { |
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33 | namespace { |
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34 | class MemberTupleExpander : public Mutator { |
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35 | public: |
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36 | typedef Mutator Parent; |
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37 | virtual Expression * mutate( UntypedMemberExpr * memberExpr ); |
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38 | }; |
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39 | |
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40 | class UniqueExprExpander : public GenPoly::DeclMutator { |
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41 | public: |
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42 | typedef GenPoly::DeclMutator Parent; |
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43 | virtual Expression * mutate( UniqueExpr * unqExpr ); |
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44 | std::map< int, ObjectDecl * > decls; // not vector, because order added may not be increasing order |
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45 | }; |
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46 | |
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47 | class TupleAssignExpander : public Mutator { |
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48 | public: |
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49 | typedef Mutator Parent; |
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50 | virtual Expression * mutate( TupleAssignExpr * tupleExpr ); |
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51 | }; |
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52 | |
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53 | class TupleTypeReplacer : public GenPoly::DeclMutator { |
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54 | public: |
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55 | typedef GenPoly::DeclMutator Parent; |
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56 | |
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57 | virtual Type * mutate( TupleType * tupleType ); |
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58 | |
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59 | virtual CompoundStmt * mutate( CompoundStmt * stmt ) { |
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60 | typeMap.beginScope(); |
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61 | stmt = Parent::mutate( stmt ); |
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62 | typeMap.endScope(); |
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63 | return stmt; |
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64 | } |
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65 | private: |
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66 | ScopedMap< std::string, StructDecl * > typeMap; |
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67 | }; |
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68 | |
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69 | class TupleIndexExpander : public Mutator { |
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70 | public: |
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71 | typedef Mutator Parent; |
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72 | virtual Expression * mutate( TupleIndexExpr * tupleExpr ); |
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73 | }; |
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74 | |
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75 | class TupleExprExpander : public Mutator { |
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76 | public: |
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77 | typedef Mutator Parent; |
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78 | virtual Expression * mutate( TupleExpr * tupleExpr ); |
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79 | }; |
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80 | } |
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81 | |
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82 | void expandMemberTuples( std::list< Declaration * > & translationUnit ) { |
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83 | MemberTupleExpander expander; |
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84 | mutateAll( translationUnit, expander ); |
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85 | } |
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86 | |
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87 | void expandUniqueExpr( std::list< Declaration * > & translationUnit ) { |
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88 | UniqueExprExpander unqExpander; |
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89 | unqExpander.mutateDeclarationList( translationUnit ); |
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90 | } |
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91 | |
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92 | void expandTuples( std::list< Declaration * > & translationUnit ) { |
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93 | TupleAssignExpander assnExpander; |
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94 | mutateAll( translationUnit, assnExpander ); |
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95 | |
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96 | TupleTypeReplacer replacer; |
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97 | replacer.mutateDeclarationList( translationUnit ); |
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98 | |
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99 | TupleIndexExpander idxExpander; |
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100 | mutateAll( translationUnit, idxExpander ); |
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101 | |
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102 | TupleExprExpander exprExpander; |
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103 | mutateAll( translationUnit, exprExpander ); |
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104 | } |
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105 | |
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106 | namespace { |
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107 | /// given a expression representing the member and an expression representing the aggregate, |
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108 | /// reconstructs a flattened UntypedMemberExpr with the right precedence |
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109 | Expression * reconstructMemberExpr( Expression * member, UniqueExpr * aggr ) { |
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110 | if ( UntypedMemberExpr * memberExpr = dynamic_cast< UntypedMemberExpr * >( member ) ) { |
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111 | // construct a new UntypedMemberExpr with the correct structure , and recursively |
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112 | // expand that member expression. |
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113 | MemberTupleExpander expander; |
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114 | UntypedMemberExpr * newMemberExpr = new UntypedMemberExpr( memberExpr->get_member(), new UntypedMemberExpr( memberExpr->get_aggregate(), aggr->clone() ) ); |
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115 | |
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116 | memberExpr->set_member(nullptr); |
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117 | memberExpr->set_aggregate(nullptr); |
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118 | delete memberExpr; |
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119 | return newMemberExpr->acceptMutator( expander ); |
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120 | } else { |
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121 | // not a member expression, so there is nothing to do but attach and return |
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122 | return new UntypedMemberExpr( member, aggr->clone() ); |
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123 | } |
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124 | } |
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125 | } |
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126 | |
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127 | Expression * MemberTupleExpander::mutate( UntypedMemberExpr * memberExpr ) { |
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128 | if ( TupleExpr * tupleExpr = dynamic_cast< TupleExpr * > ( memberExpr->get_member() ) ) { |
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129 | UniqueExpr * unqExpr = new UniqueExpr( memberExpr->get_aggregate()->clone() ); |
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130 | for ( Expression *& expr : tupleExpr->get_exprs() ) { |
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131 | expr = reconstructMemberExpr( expr, unqExpr ); |
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132 | } |
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133 | delete unqExpr; |
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134 | return tupleExpr; |
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135 | } else { |
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136 | // there may be a tuple expr buried in the aggregate |
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137 | // xxx - this is a memory leak |
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138 | return new UntypedMemberExpr( memberExpr->get_member()->clone(), memberExpr->get_aggregate()->acceptMutator( *this ) ); |
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139 | } |
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140 | } |
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141 | |
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142 | Expression * UniqueExprExpander::mutate( UniqueExpr * unqExpr ) { |
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143 | static UniqueName tempNamer( "_unq_expr_" ); |
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144 | unqExpr = safe_dynamic_cast< UniqueExpr * > ( Parent::mutate( unqExpr ) ); |
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145 | if ( ! decls.count( unqExpr->get_id() ) ) { |
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146 | // xxx - it's possible (likely?) that expressions can appear in the wrong order because of this. Need to ensure they're placed in the correct location. |
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147 | |
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148 | // xxx - this doesn't work, because it would need to be placed after fixInit, but fixInit doesn't know (and shouldn't have to know) about the existance of UniqueExprs - i.e. it will visit them twice |
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149 | // need to construct/destruct unique exprs in general - maybe it's not worth it and fixInit should handle UniqueExpr explicitly? |
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150 | // currently, tmp is being destructed before unqExpr is used, which suggests there should be a separate lifetime for unqExpr from the tmp_ret |
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151 | |
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152 | // if ( CommaExpr * commaExpr = dynamic_cast< CommaExpr * >( unqExpr->get_expr() ) ) { |
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153 | // if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( commaExpr->get_arg2() ) ) { |
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154 | // // steal existing decl from expr |
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155 | // if ( ObjectDecl * decl = dynamic_cast< ObjectDecl * >( varExpr->get_var() ) ) { |
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156 | // decls[unqExpr->get_id()] = decl; |
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157 | // return unqExpr->get_expr()->clone(); |
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158 | // } |
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159 | // } |
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160 | // } |
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161 | |
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162 | // xxx - attach a resolved ConstructorInit node? |
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163 | // xxx - is it possible to make the objDecl's type const? |
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164 | ObjectDecl * objDecl = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, nullptr, unqExpr->get_result()->clone(), nullptr ); |
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165 | // must be done on two lines because genCtorInit accesses objDecl's fields |
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166 | objDecl->set_init( InitTweak::genCtorInit( objDecl ) ); |
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167 | |
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168 | decls[unqExpr->get_id()] = objDecl; |
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169 | addDeclaration( objDecl ); |
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170 | } |
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171 | return new VariableExpr( decls[unqExpr->get_id()] ); |
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172 | } |
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173 | |
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174 | Expression * TupleAssignExpander::mutate( TupleAssignExpr * assnExpr ) { |
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175 | // xxx - Parent::mutate? |
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176 | CompoundStmt * compoundStmt = new CompoundStmt( noLabels ); |
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177 | std::list< Statement * > & stmts = compoundStmt->get_kids(); |
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178 | for ( ObjectDecl * obj : assnExpr->get_tempDecls() ) { |
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179 | stmts.push_back( new DeclStmt( noLabels, obj ) ); |
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180 | } |
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181 | TupleExpr * tupleExpr = new TupleExpr( assnExpr->get_assigns() ); |
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182 | assert( tupleExpr->get_result() ); |
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183 | stmts.push_back( new ExprStmt( noLabels, tupleExpr ) ); |
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184 | assnExpr->get_tempDecls().clear(); |
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185 | assnExpr->get_assigns().clear(); |
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186 | delete assnExpr; |
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187 | return new StmtExpr( compoundStmt ); |
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188 | } |
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189 | |
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190 | Type * TupleTypeReplacer::mutate( TupleType * tupleType ) { |
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191 | std::string mangleName = SymTab::Mangler::mangleType( tupleType ); |
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192 | TupleType * newType = safe_dynamic_cast< TupleType * > ( Parent::mutate( tupleType ) ); |
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193 | if ( ! typeMap.count( mangleName ) ) { |
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194 | // generate struct type to replace tuple type |
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195 | StructDecl * decl = new StructDecl( "_tuple_type_" + mangleName ); |
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196 | decl->set_body( true ); |
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197 | int cnt = 0; |
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198 | for ( Type * t : *newType ) { |
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199 | decl->get_members().push_back( new ObjectDecl( "field_"+std::to_string(++cnt), DeclarationNode::NoStorageClass, LinkageSpec::C, nullptr, t->clone(), nullptr ) ); |
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200 | } |
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201 | typeMap[mangleName] = decl; |
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202 | addDeclaration( decl ); |
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203 | } |
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204 | Type::Qualifiers qualifiers = newType->get_qualifiers(); |
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205 | delete newType; |
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206 | return new StructInstType( qualifiers, typeMap[mangleName] ); |
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207 | } |
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208 | |
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209 | Expression * TupleIndexExpander::mutate( TupleIndexExpr * tupleExpr ) { |
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210 | Expression * tuple = maybeMutate( tupleExpr->get_tuple(), *this ); |
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211 | assert( tuple ); |
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212 | tupleExpr->set_tuple( nullptr ); |
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213 | unsigned int idx = tupleExpr->get_index(); |
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214 | delete tupleExpr; |
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215 | |
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216 | StructInstType * type = safe_dynamic_cast< StructInstType * >( tuple->get_result() ); |
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217 | StructDecl * structDecl = type->get_baseStruct(); |
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218 | assert( structDecl->get_members().size() > idx ); |
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219 | Declaration * member = *std::next(structDecl->get_members().begin(), idx); |
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220 | return new MemberExpr( safe_dynamic_cast< DeclarationWithType * >( member ), tuple ); |
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221 | } |
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222 | |
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223 | Expression * replaceTupleExpr( Type * result, const std::list< Expression * > & exprs ) { |
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224 | if ( result->isVoid() ) { |
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225 | // void result - don't need to produce a value for cascading - just output a chain of comma exprs |
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226 | assert( ! exprs.empty() ); |
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227 | std::list< Expression * >::const_iterator iter = exprs.begin(); |
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228 | Expression * expr = *iter++; |
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229 | for ( ; iter != exprs.end(); ++iter ) { |
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230 | expr = new CommaExpr( expr, *iter ); |
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231 | } |
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232 | return expr; |
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233 | } else { |
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234 | // typed tuple expression - produce a compound literal which performs each of the expressions |
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235 | // as a distinct part of its initializer - the produced compound literal may be used as part of |
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236 | // another expression |
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237 | std::list< Initializer * > inits; |
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238 | for ( Expression * expr : exprs ) { |
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239 | inits.push_back( new SingleInit( expr ) ); |
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240 | } |
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241 | return new CompoundLiteralExpr( result, new ListInit( inits ) ); |
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242 | } |
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243 | } |
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244 | |
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245 | Expression * TupleExprExpander::mutate( TupleExpr * tupleExpr ) { |
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246 | // recursively expand sub-tuple-expressions |
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247 | tupleExpr = safe_dynamic_cast<TupleExpr *>(Parent::mutate(tupleExpr)); |
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248 | Type * result = tupleExpr->get_result(); |
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249 | std::list< Expression * > exprs = tupleExpr->get_exprs(); |
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250 | assert( result ); |
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251 | |
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252 | // remove data from shell and delete it |
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253 | tupleExpr->set_result( nullptr ); |
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254 | tupleExpr->get_exprs().clear(); |
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255 | delete tupleExpr; |
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256 | |
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257 | return replaceTupleExpr( result, exprs ); |
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258 | } |
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259 | |
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260 | Type * makeTupleType( const std::list< Expression * > & exprs ) { |
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261 | // produce the TupleType which aggregates the types of the exprs |
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262 | TupleType *tupleType = new TupleType( Type::Qualifiers(true, true, true, true, true, false) ); |
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263 | Type::Qualifiers &qualifiers = tupleType->get_qualifiers(); |
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264 | for ( Expression * expr : exprs ) { |
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265 | assert( expr->get_result() ); |
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266 | if ( expr->get_result()->isVoid() ) { |
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267 | // if the type of any expr is void, the type of the entire tuple is void |
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268 | delete tupleType; |
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269 | return new VoidType( Type::Qualifiers() ); |
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270 | } |
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271 | Type * type = expr->get_result()->clone(); |
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272 | tupleType->get_types().push_back( type ); |
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273 | // the qualifiers on the tuple type are the qualifiers that exist on all component types |
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274 | qualifiers &= type->get_qualifiers(); |
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275 | } // for |
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276 | return tupleType; |
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277 | } |
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278 | |
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279 | namespace { |
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280 | /// determines if impurity (read: side-effects) may exist in a piece of code. Currently gives a very crude approximation, wherein any function call expression means the code may be impure |
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281 | class ImpurityDetector : public Visitor { |
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282 | public: |
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283 | typedef Visitor Parent; |
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284 | virtual void visit( ApplicationExpr * appExpr ) { maybeImpure = true; } |
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285 | virtual void visit( UntypedExpr * untypedExpr ) { maybeImpure = true; } |
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286 | bool maybeImpure = false; |
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287 | }; |
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288 | } // namespace |
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289 | |
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290 | bool maybeImpure( Expression * expr ) { |
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291 | ImpurityDetector detector; |
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292 | expr->accept( detector ); |
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293 | return detector.maybeImpure; |
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294 | } |
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295 | } // namespace Tuples |
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296 | |
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297 | // Local Variables: // |
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298 | // tab-width: 4 // |
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299 | // mode: c++ // |
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300 | // compile-command: "make install" // |
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301 | // End: // |
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302 | |
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