1 | #include "InitTweak.h" |
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2 | #include "SynTree/Visitor.h" |
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3 | #include "SynTree/Statement.h" |
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4 | #include "SynTree/Initializer.h" |
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5 | #include "SynTree/Expression.h" |
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6 | #include "GenPoly/GenPoly.h" |
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7 | |
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8 | namespace InitTweak { |
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9 | namespace { |
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10 | class HasDesignations : public Visitor { |
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11 | public: |
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12 | bool hasDesignations = false; |
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13 | template<typename Init> |
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14 | void handleInit( Init * init ) { |
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15 | if ( ! init->get_designators().empty() ) hasDesignations = true; |
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16 | else Visitor::visit( init ); |
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17 | } |
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18 | virtual void visit( SingleInit * singleInit ) { handleInit( singleInit); } |
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19 | virtual void visit( ListInit * listInit ) { handleInit( listInit); } |
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20 | }; |
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21 | |
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22 | class InitExpander_OLD : public Visitor { |
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23 | public: |
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24 | virtual void visit( SingleInit * singleInit ); |
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25 | virtual void visit( ListInit * listInit ); |
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26 | std::list< Expression * > argList; |
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27 | }; |
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28 | |
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29 | void InitExpander_OLD::visit( SingleInit * singleInit ) { |
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30 | argList.push_back( singleInit->get_value()->clone() ); |
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31 | } |
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32 | |
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33 | void InitExpander_OLD::visit( ListInit * listInit ) { |
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34 | // xxx - for now, assume no nested list inits |
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35 | std::list<Initializer*>::iterator it = listInit->begin_initializers(); |
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36 | for ( ; it != listInit->end_initializers(); ++it ) { |
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37 | (*it)->accept( *this ); |
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38 | } |
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39 | } |
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40 | } |
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41 | |
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42 | std::list< Expression * > makeInitList( Initializer * init ) { |
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43 | InitExpander_OLD expander; |
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44 | maybeAccept( init, expander ); |
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45 | return expander.argList; |
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46 | } |
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47 | |
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48 | bool isDesignated( Initializer * init ) { |
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49 | HasDesignations finder; |
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50 | maybeAccept( init, finder ); |
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51 | return finder.hasDesignations; |
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52 | } |
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53 | |
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54 | class InitExpander::ExpanderImpl { |
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55 | public: |
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56 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0; |
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57 | }; |
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58 | |
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59 | class InitImpl : public InitExpander::ExpanderImpl { |
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60 | public: |
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61 | InitImpl( Initializer * init ) { |
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62 | if ( init ) inits.push_back( init ); |
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63 | } |
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64 | |
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65 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) { |
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66 | // this is wrong, but just a placeholder for now |
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67 | return ! inits.empty() ? makeInitList( inits.front() ) : std::list< Expression * >(); |
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68 | } |
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69 | private: |
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70 | std::list< Initializer * > inits; |
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71 | }; |
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72 | |
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73 | class ExprImpl : public InitExpander::ExpanderImpl { |
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74 | public: |
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75 | ExprImpl( Expression * expr ) : arg( expr ) {} |
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76 | |
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77 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) { |
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78 | std::list< Expression * > ret; |
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79 | Expression * expr = maybeClone( arg ); |
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80 | if ( expr ) { |
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81 | for ( std::list< Expression * >::reverse_iterator it = indices.rbegin(); it != indices.rend(); ++it ) { |
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82 | // go through indices and layer on subscript exprs ?[?] |
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83 | ++it; |
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84 | UntypedExpr * subscriptExpr = new UntypedExpr( new NameExpr( "?[?]") ); |
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85 | subscriptExpr->get_args().push_back( expr ); |
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86 | subscriptExpr->get_args().push_back( (*it)->clone() ); |
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87 | expr = subscriptExpr; |
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88 | } |
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89 | ret.push_back( expr ); |
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90 | } |
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91 | return ret; |
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92 | } |
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93 | private: |
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94 | Expression * arg; |
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95 | }; |
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96 | |
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97 | InitExpander::InitExpander( Initializer * init ) : expander( new InitImpl( init ) ) {} |
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98 | |
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99 | InitExpander::InitExpander( Expression * expr ) : expander( new ExprImpl( expr ) ) {} |
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100 | |
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101 | std::list< Expression * > InitExpander::operator*() { |
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102 | return cur; |
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103 | } |
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104 | |
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105 | InitExpander & InitExpander::operator++() { |
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106 | cur = expander->next( indices ); |
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107 | return *this; |
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108 | } |
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109 | |
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110 | // use array indices list to build switch statement |
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111 | void InitExpander::addArrayIndex( Expression * index, Expression * dimension ) { |
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112 | indices.push_back( index ); |
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113 | indices.push_back( dimension ); |
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114 | } |
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115 | |
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116 | template< typename OutIterator > |
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117 | void build( UntypedExpr * callExpr, InitExpander::IndexList::iterator idx, InitExpander::IndexList::iterator end, OutIterator out ) { |
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118 | if ( idx == end ) return; |
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119 | Expression * index = *idx++; |
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120 | assert( idx != end ); |
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121 | Expression * dimension = *idx++; |
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122 | |
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123 | // if ( idx == end ) { |
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124 | // // loop through list of expressions belonging to the current initializer |
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125 | // UntypedExpr * cond = new UntypedExpr( new NameExpr( "?<?") ); |
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126 | // cond->get_args().push_back( index->clone() ); |
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127 | // cond->get_args().push_back( dimension->clone() ); |
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128 | |
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129 | // UntypedExpr * call = callExpr->clone(); |
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130 | // std::list< Expression * > args = *++expander; // xxx - need a way to indentify the end of an init list |
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131 | // call->get_args().splice( args ); |
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132 | |
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133 | // *out++ = new IfStmt( noLabels, cond, new ExprStmt( call ), NULL ); |
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134 | |
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135 | // UntypedExpr * increment = new UntypedExpr( new NameExpr( "++?" ) ); |
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136 | // increment->get_args().push_back( index->clone() ); |
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137 | // *out++ = new ExprStmt( increment ); |
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138 | // } else { |
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139 | // std::list< Statement * > branches; |
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140 | // for (...) { // loop over conditions? |
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141 | // std::list< Statement * > stmts; |
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142 | // build( idx, end, back_inserter( stmts ) ); |
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143 | // CaseStmt * caseStmt = new CaseStmt( noLabels, condition, stmts ); |
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144 | // branches.push_back( caseStmt ); |
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145 | // } |
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146 | // *out++ = new SwitchStmt( noLabels, index->clone(), branches ); |
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147 | // } |
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148 | } |
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149 | |
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150 | // generate switch statement, consuming all of expander's elements |
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151 | Statement * InitExpander::buildListInit( UntypedExpr * dst ) { |
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152 | std::list< Statement * > results; |
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153 | build( dst, indices.begin(), indices.end(), back_inserter( results ) ); |
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154 | assert( results.size() <= 1 ); |
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155 | return ! results.empty() ? results.front() : NULL; |
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156 | } |
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157 | |
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158 | bool tryConstruct( ObjectDecl * objDecl ) { |
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159 | return ! LinkageSpec::isBuiltin( objDecl->get_linkage() ) && |
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160 | (objDecl->get_init() == NULL || |
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161 | ( objDecl->get_init() != NULL && objDecl->get_init()->get_maybeConstructed() )) && |
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162 | ! isDesignated( objDecl->get_init() ) |
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163 | && objDecl->get_storageClass() != DeclarationNode::Extern; |
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164 | } |
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165 | |
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166 | Expression * getCtorDtorCall( Statement * stmt ) { |
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167 | if ( stmt == NULL ) return NULL; |
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168 | if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) { |
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169 | return exprStmt->get_expr(); |
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170 | } else if ( CompoundStmt * compoundStmt = dynamic_cast< CompoundStmt * >( stmt ) ) { |
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171 | // could also be a compound statement with a loop, in the case of an array |
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172 | if( compoundStmt->get_kids().size() == 2 ) { |
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173 | // loop variable and loop |
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174 | ForStmt * forStmt = dynamic_cast< ForStmt * >( compoundStmt->get_kids().back() ); |
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175 | assert( forStmt && forStmt->get_body() ); |
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176 | return getCtorDtorCall( forStmt->get_body() ); |
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177 | } else if ( compoundStmt->get_kids().size() == 1 ) { |
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178 | // should be the call statement, but in any case there's only one option |
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179 | return getCtorDtorCall( compoundStmt->get_kids().front() ); |
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180 | } else { |
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181 | assert( false && "too many statements in compoundStmt for getCtorDtorCall" ); |
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182 | } |
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183 | } if ( ImplicitCtorDtorStmt * impCtorDtorStmt = dynamic_cast< ImplicitCtorDtorStmt * > ( stmt ) ) { |
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184 | return getCtorDtorCall( impCtorDtorStmt->get_callStmt() ); |
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185 | } else { |
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186 | // should never get here |
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187 | assert( false && "encountered unknown call statement" ); |
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188 | } |
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189 | } |
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190 | namespace { |
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191 | VariableExpr * getCalledFunction( ApplicationExpr * appExpr ) { |
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192 | assert( appExpr ); |
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193 | return dynamic_cast< VariableExpr * >( appExpr->get_function() ); |
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194 | } |
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195 | } |
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196 | |
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197 | ApplicationExpr * isIntrinsicCallExpr( Expression * expr ) { |
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198 | ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ); |
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199 | if ( ! appExpr ) return NULL; |
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200 | VariableExpr * function = getCalledFunction( appExpr ); |
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201 | assert( function ); |
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202 | // check for Intrinsic only - don't want to remove all overridable ctor/dtors because autogenerated ctor/dtor |
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203 | // will call all member dtors, and some members may have a user defined dtor. |
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204 | return function->get_var()->get_linkage() == LinkageSpec::Intrinsic ? appExpr : NULL; |
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205 | } |
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206 | |
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207 | bool isInstrinsicSingleArgCallStmt( Statement * stmt ) { |
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208 | Expression * callExpr = getCtorDtorCall( stmt ); |
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209 | if ( ! callExpr ) return false; |
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210 | if ( ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) { |
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211 | assert( ! appExpr->get_function()->get_results().empty() ); |
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212 | FunctionType *funcType = GenPoly::getFunctionType( appExpr->get_function()->get_results().front() ); |
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213 | assert( funcType ); |
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214 | return funcType->get_parameters().size() == 1; |
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215 | } |
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216 | return false; |
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217 | } |
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218 | |
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219 | namespace { |
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220 | template<typename CallExpr> |
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221 | Expression *& callArg( CallExpr * callExpr, unsigned int pos ) { |
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222 | if ( pos >= callExpr->get_args().size() ) assert( false && "asking for argument that doesn't exist. Return NULL/throw exception?" ); |
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223 | for ( Expression *& arg : callExpr->get_args() ) { |
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224 | if ( pos == 0 ) return arg; |
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225 | pos--; |
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226 | } |
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227 | assert( false ); |
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228 | } |
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229 | } |
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230 | |
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231 | Expression *& getCallArg( Expression * callExpr, unsigned int pos ) { |
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232 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( callExpr ) ) { |
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233 | return callArg( appExpr, pos ); |
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234 | } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( callExpr ) ) { |
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235 | return callArg( untypedExpr, pos ); |
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236 | } else { |
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237 | assert( false && "Unexpected expression type passed to getCallArg" ); |
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238 | } |
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239 | } |
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240 | |
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241 | namespace { |
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242 | std::string funcName( Expression * func ) { |
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243 | if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( func ) ) { |
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244 | return nameExpr->get_name(); |
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245 | } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( func ) ) { |
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246 | return varExpr->get_var()->get_name(); |
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247 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( func ) ) { |
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248 | return funcName( castExpr->get_arg() ); |
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249 | } else { |
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250 | assert( false && "Unexpected expression type being called as a function in call expression" ); |
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251 | } |
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252 | } |
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253 | } |
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254 | |
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255 | std::string getFunctionName( Expression * expr ) { |
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256 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) { |
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257 | return funcName( appExpr->get_function() ); |
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258 | } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * > ( expr ) ) { |
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259 | return funcName( untypedExpr->get_function() ); |
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260 | } else { |
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261 | std::cerr << expr << std::endl; |
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262 | assert( false && "Unexpected expression type passed to getFunctionName" ); |
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263 | } |
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264 | } |
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265 | |
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266 | Type * getPointerBase( Type * type ) { |
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267 | if ( PointerType * ptrType = dynamic_cast< PointerType * >( type ) ) { |
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268 | return ptrType->get_base(); |
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269 | } else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) { |
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270 | return arrayType->get_base(); |
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271 | } else { |
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272 | return NULL; |
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273 | } |
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274 | } |
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275 | |
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276 | Type * isPointerType( Type * type ) { |
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277 | if ( getPointerBase( type ) ) return type; |
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278 | else return NULL; |
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279 | } |
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280 | |
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281 | class ConstExprChecker : public Visitor { |
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282 | public: |
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283 | ConstExprChecker() : isConstExpr( true ) {} |
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284 | |
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285 | virtual void visit( ApplicationExpr *applicationExpr ) { isConstExpr = false; } |
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286 | virtual void visit( UntypedExpr *untypedExpr ) { isConstExpr = false; } |
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287 | virtual void visit( NameExpr *nameExpr ) { isConstExpr = false; } |
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288 | virtual void visit( CastExpr *castExpr ) { isConstExpr = false; } |
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289 | virtual void visit( LabelAddressExpr *labAddressExpr ) { isConstExpr = false; } |
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290 | virtual void visit( UntypedMemberExpr *memberExpr ) { isConstExpr = false; } |
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291 | virtual void visit( MemberExpr *memberExpr ) { isConstExpr = false; } |
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292 | virtual void visit( VariableExpr *variableExpr ) { isConstExpr = false; } |
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293 | virtual void visit( ConstantExpr *constantExpr ) { /* bottom out */ } |
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294 | // these might be okay? |
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295 | // virtual void visit( SizeofExpr *sizeofExpr ); |
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296 | // virtual void visit( AlignofExpr *alignofExpr ); |
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297 | // virtual void visit( UntypedOffsetofExpr *offsetofExpr ); |
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298 | // virtual void visit( OffsetofExpr *offsetofExpr ); |
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299 | // virtual void visit( OffsetPackExpr *offsetPackExpr ); |
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300 | // virtual void visit( AttrExpr *attrExpr ); |
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301 | // virtual void visit( CommaExpr *commaExpr ); |
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302 | // virtual void visit( LogicalExpr *logicalExpr ); |
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303 | // virtual void visit( ConditionalExpr *conditionalExpr ); |
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304 | virtual void visit( TupleExpr *tupleExpr ) { isConstExpr = false; } |
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305 | virtual void visit( SolvedTupleExpr *tupleExpr ) { isConstExpr = false; } |
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306 | virtual void visit( TypeExpr *typeExpr ) { isConstExpr = false; } |
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307 | virtual void visit( AsmExpr *asmExpr ) { isConstExpr = false; } |
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308 | virtual void visit( UntypedValofExpr *valofExpr ) { isConstExpr = false; } |
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309 | virtual void visit( CompoundLiteralExpr *compLitExpr ) { isConstExpr = false; } |
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310 | |
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311 | bool isConstExpr; |
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312 | }; |
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313 | |
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314 | bool isConstExpr( Expression * expr ) { |
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315 | if ( expr ) { |
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316 | ConstExprChecker checker; |
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317 | expr->accept( checker ); |
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318 | return checker.isConstExpr; |
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319 | } |
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320 | return true; |
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321 | } |
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322 | |
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323 | bool isConstExpr( Initializer * init ) { |
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324 | if ( init ) { |
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325 | ConstExprChecker checker; |
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326 | init->accept( checker ); |
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327 | return checker.isConstExpr; |
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328 | } // if |
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329 | // for all intents and purposes, no initializer means const expr |
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330 | return true; |
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331 | } |
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332 | |
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333 | } |
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