1 | #include <algorithm> |
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2 | #include "InitTweak.h" |
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3 | #include "SynTree/Visitor.h" |
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4 | #include "SynTree/Statement.h" |
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5 | #include "SynTree/Initializer.h" |
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6 | #include "SynTree/Expression.h" |
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7 | #include "SynTree/Attribute.h" |
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8 | #include "GenPoly/GenPoly.h" |
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9 | #include "ResolvExpr/typeops.h" |
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10 | |
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11 | namespace InitTweak { |
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12 | namespace { |
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13 | class HasDesignations : public Visitor { |
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14 | public: |
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15 | bool hasDesignations = false; |
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16 | template<typename Init> |
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17 | void handleInit( Init * init ) { |
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18 | if ( ! init->get_designators().empty() ) hasDesignations = true; |
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19 | else Visitor::visit( init ); |
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20 | } |
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21 | virtual void visit( SingleInit * singleInit ) { handleInit( singleInit); } |
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22 | virtual void visit( ListInit * listInit ) { handleInit( listInit); } |
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23 | }; |
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24 | |
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25 | class InitDepthChecker : public Visitor { |
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26 | public: |
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27 | bool depthOkay = true; |
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28 | Type * type; |
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29 | int curDepth = 0, maxDepth = 0; |
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30 | InitDepthChecker( Type * type ) : type( type ) { |
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31 | Type * t = type; |
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32 | while ( ArrayType * at = dynamic_cast< ArrayType * >( t ) ) { |
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33 | maxDepth++; |
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34 | t = at->get_base(); |
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35 | } |
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36 | maxDepth++; |
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37 | } |
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38 | virtual void visit( ListInit * listInit ) { |
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39 | curDepth++; |
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40 | if ( curDepth > maxDepth ) depthOkay = false; |
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41 | Visitor::visit( listInit ); |
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42 | curDepth--; |
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43 | } |
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44 | }; |
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45 | |
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46 | class InitFlattener : public Visitor { |
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47 | public: |
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48 | virtual void visit( SingleInit * singleInit ); |
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49 | virtual void visit( ListInit * listInit ); |
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50 | std::list< Expression * > argList; |
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51 | }; |
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52 | |
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53 | void InitFlattener::visit( SingleInit * singleInit ) { |
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54 | argList.push_back( singleInit->get_value()->clone() ); |
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55 | } |
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56 | |
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57 | void InitFlattener::visit( ListInit * listInit ) { |
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58 | // flatten nested list inits |
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59 | std::list<Initializer*>::iterator it = listInit->begin(); |
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60 | for ( ; it != listInit->end(); ++it ) { |
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61 | (*it)->accept( *this ); |
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62 | } |
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63 | } |
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64 | } |
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65 | |
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66 | std::list< Expression * > makeInitList( Initializer * init ) { |
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67 | InitFlattener flattener; |
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68 | maybeAccept( init, flattener ); |
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69 | return flattener.argList; |
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70 | } |
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71 | |
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72 | bool isDesignated( Initializer * init ) { |
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73 | HasDesignations finder; |
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74 | maybeAccept( init, finder ); |
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75 | return finder.hasDesignations; |
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76 | } |
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77 | |
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78 | bool checkInitDepth( ObjectDecl * objDecl ) { |
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79 | InitDepthChecker checker( objDecl->get_type() ); |
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80 | maybeAccept( objDecl->get_init(), checker ); |
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81 | return checker.depthOkay; |
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82 | } |
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83 | |
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84 | class InitExpander::ExpanderImpl { |
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85 | public: |
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86 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0; |
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87 | virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ) = 0; |
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88 | }; |
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89 | |
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90 | class InitImpl : public InitExpander::ExpanderImpl { |
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91 | public: |
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92 | InitImpl( Initializer * init ) : init( init ) {} |
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93 | |
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94 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) { |
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95 | // this is wrong, but just a placeholder for now |
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96 | // if ( ! flattened ) flatten( indices ); |
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97 | // return ! inits.empty() ? makeInitList( inits.front() ) : std::list< Expression * >(); |
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98 | return makeInitList( init ); |
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99 | } |
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100 | |
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101 | virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ); |
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102 | private: |
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103 | Initializer * init; |
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104 | }; |
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105 | |
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106 | class ExprImpl : public InitExpander::ExpanderImpl { |
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107 | public: |
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108 | ExprImpl( Expression * expr ) : arg( expr ) {} |
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109 | |
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110 | ~ExprImpl() { delete arg; } |
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111 | |
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112 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) { |
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113 | std::list< Expression * > ret; |
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114 | Expression * expr = maybeClone( arg ); |
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115 | if ( expr ) { |
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116 | for ( std::list< Expression * >::reverse_iterator it = indices.rbegin(); it != indices.rend(); ++it ) { |
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117 | // go through indices and layer on subscript exprs ?[?] |
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118 | ++it; |
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119 | UntypedExpr * subscriptExpr = new UntypedExpr( new NameExpr( "?[?]") ); |
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120 | subscriptExpr->get_args().push_back( expr ); |
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121 | subscriptExpr->get_args().push_back( (*it)->clone() ); |
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122 | expr = subscriptExpr; |
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123 | } |
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124 | ret.push_back( expr ); |
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125 | } |
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126 | return ret; |
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127 | } |
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128 | |
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129 | virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ); |
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130 | private: |
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131 | Expression * arg; |
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132 | }; |
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133 | |
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134 | InitExpander::InitExpander( Initializer * init ) : expander( new InitImpl( init ) ) {} |
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135 | |
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136 | InitExpander::InitExpander( Expression * expr ) : expander( new ExprImpl( expr ) ) {} |
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137 | |
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138 | std::list< Expression * > InitExpander::operator*() { |
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139 | return cur; |
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140 | } |
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141 | |
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142 | InitExpander & InitExpander::operator++() { |
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143 | cur = expander->next( indices ); |
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144 | return *this; |
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145 | } |
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146 | |
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147 | // use array indices list to build switch statement |
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148 | void InitExpander::addArrayIndex( Expression * index, Expression * dimension ) { |
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149 | indices.push_back( index ); |
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150 | indices.push_back( dimension ); |
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151 | } |
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152 | |
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153 | void InitExpander::clearArrayIndices() { |
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154 | deleteAll( indices ); |
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155 | indices.clear(); |
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156 | } |
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157 | |
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158 | namespace { |
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159 | /// given index i, dimension d, initializer init, and callExpr f, generates |
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160 | /// if (i < d) f(..., init) |
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161 | /// ++i; |
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162 | /// so that only elements within the range of the array are constructed |
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163 | template< typename OutIterator > |
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164 | void buildCallExpr( UntypedExpr * callExpr, Expression * index, Expression * dimension, Initializer * init, OutIterator out ) { |
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165 | UntypedExpr * cond = new UntypedExpr( new NameExpr( "?<?") ); |
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166 | cond->get_args().push_back( index->clone() ); |
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167 | cond->get_args().push_back( dimension->clone() ); |
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168 | |
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169 | std::list< Expression * > args = makeInitList( init ); |
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170 | callExpr->get_args().splice( callExpr->get_args().end(), args ); |
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171 | |
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172 | *out++ = new IfStmt( noLabels, cond, new ExprStmt( noLabels, callExpr ), NULL ); |
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173 | |
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174 | UntypedExpr * increment = new UntypedExpr( new NameExpr( "++?" ) ); |
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175 | increment->get_args().push_back( new AddressExpr( index->clone() ) ); |
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176 | *out++ = new ExprStmt( noLabels, increment ); |
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177 | } |
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178 | |
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179 | template< typename OutIterator > |
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180 | void build( UntypedExpr * callExpr, InitExpander::IndexList::iterator idx, InitExpander::IndexList::iterator idxEnd, Initializer * init, OutIterator out ) { |
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181 | if ( idx == idxEnd ) return; |
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182 | Expression * index = *idx++; |
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183 | assert( idx != idxEnd ); |
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184 | Expression * dimension = *idx++; |
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185 | |
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186 | // xxx - may want to eventually issue a warning here if we can detect |
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187 | // that the number of elements exceeds to dimension of the array |
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188 | if ( idx == idxEnd ) { |
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189 | if ( ListInit * listInit = dynamic_cast< ListInit * >( init ) ) { |
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190 | for ( Initializer * init : *listInit ) { |
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191 | buildCallExpr( callExpr->clone(), index, dimension, init, out ); |
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192 | } |
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193 | } else { |
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194 | buildCallExpr( callExpr->clone(), index, dimension, init, out ); |
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195 | } |
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196 | } else { |
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197 | std::list< Statement * > branches; |
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198 | |
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199 | unsigned long cond = 0; |
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200 | ListInit * listInit = dynamic_cast< ListInit * >( init ); |
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201 | if ( ! listInit ) { |
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202 | // xxx - this shouldn't be an error, but need a way to |
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203 | // terminate without creating output, so should catch this error |
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204 | throw SemanticError( "unbalanced list initializers" ); |
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205 | } |
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206 | |
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207 | static UniqueName targetLabel( "L__autogen__" ); |
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208 | Label switchLabel( targetLabel.newName(), 0, std::list< Attribute * >{ new Attribute("unused") } ); |
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209 | for ( Initializer * init : *listInit ) { |
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210 | Expression * condition; |
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211 | // check for designations |
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212 | // if ( init-> ) { |
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213 | condition = new ConstantExpr( Constant::from_ulong( cond ) ); |
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214 | ++cond; |
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215 | // } else { |
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216 | // condition = // ... take designation |
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217 | // cond = // ... take designation+1 |
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218 | // } |
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219 | std::list< Statement * > stmts; |
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220 | build( callExpr, idx, idxEnd, init, back_inserter( stmts ) ); |
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221 | stmts.push_back( new BranchStmt( noLabels, switchLabel, BranchStmt::Break ) ); |
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222 | CaseStmt * caseStmt = new CaseStmt( noLabels, condition, stmts ); |
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223 | branches.push_back( caseStmt ); |
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224 | } |
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225 | *out++ = new SwitchStmt( noLabels, index->clone(), branches ); |
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226 | *out++ = new NullStmt( std::list<Label>{ switchLabel } ); |
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227 | } |
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228 | } |
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229 | } |
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230 | |
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231 | // if array came with an initializer list: initialize each element |
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232 | // may have more initializers than elements in the array - need to check at each index that |
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233 | // we haven't exceeded size. |
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234 | // may have fewer initializers than elements in the array - need to default construct |
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235 | // remaining elements. |
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236 | // To accomplish this, generate switch statement, consuming all of expander's elements |
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237 | Statement * InitImpl::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) { |
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238 | if ( ! init ) return NULL; |
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239 | CompoundStmt * block = new CompoundStmt( noLabels ); |
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240 | build( dst, indices.begin(), indices.end(), init, back_inserter( block->get_kids() ) ); |
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241 | if ( block->get_kids().empty() ) { |
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242 | delete block; |
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243 | return NULL; |
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244 | } else { |
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245 | init = NULL; // init was consumed in creating the list init |
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246 | return block; |
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247 | } |
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248 | } |
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249 | |
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250 | Statement * ExprImpl::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) { |
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251 | return NULL; |
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252 | } |
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253 | |
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254 | Statement * InitExpander::buildListInit( UntypedExpr * dst ) { |
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255 | return expander->buildListInit( dst, indices ); |
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256 | } |
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257 | |
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258 | bool tryConstruct( ObjectDecl * objDecl ) { |
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259 | return ! LinkageSpec::isBuiltin( objDecl->get_linkage() ) && |
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260 | (objDecl->get_init() == NULL || |
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261 | ( objDecl->get_init() != NULL && objDecl->get_init()->get_maybeConstructed() )) |
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262 | && objDecl->get_storageClass() != DeclarationNode::Extern; |
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263 | } |
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264 | |
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265 | class CallFinder : public Visitor { |
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266 | public: |
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267 | typedef Visitor Parent; |
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268 | CallFinder( const std::list< std::string > & names ) : names( names ) {} |
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269 | |
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270 | virtual void visit( ApplicationExpr * appExpr ) { |
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271 | handleCallExpr( appExpr ); |
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272 | } |
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273 | |
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274 | virtual void visit( UntypedExpr * untypedExpr ) { |
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275 | handleCallExpr( untypedExpr ); |
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276 | } |
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277 | |
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278 | std::list< Expression * > * matches; |
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279 | private: |
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280 | const std::list< std::string > names; |
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281 | |
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282 | template< typename CallExpr > |
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283 | void handleCallExpr( CallExpr * expr ) { |
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284 | Parent::visit( expr ); |
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285 | std::string fname = getFunctionName( expr ); |
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286 | if ( std::find( names.begin(), names.end(), fname ) != names.end() ) { |
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287 | matches->push_back( expr ); |
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288 | } |
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289 | } |
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290 | }; |
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291 | |
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292 | void collectCtorDtorCalls( Statement * stmt, std::list< Expression * > & matches ) { |
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293 | static CallFinder finder( std::list< std::string >{ "?{}", "^?{}" } ); |
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294 | finder.matches = &matches; |
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295 | maybeAccept( stmt, finder ); |
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296 | } |
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297 | |
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298 | Expression * getCtorDtorCall( Statement * stmt ) { |
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299 | std::list< Expression * > matches; |
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300 | collectCtorDtorCalls( stmt, matches ); |
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301 | assert( matches.size() <= 1 ); |
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302 | return matches.size() == 1 ? matches.front() : NULL; |
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303 | } |
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304 | |
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305 | namespace { |
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306 | DeclarationWithType * getCalledFunction( Expression * expr ) { |
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307 | assert( expr ); |
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308 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) { |
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309 | return varExpr->get_var(); |
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310 | } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) { |
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311 | return memberExpr->get_member(); |
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312 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) { |
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313 | return getCalledFunction( castExpr->get_arg() ); |
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314 | } |
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315 | return nullptr; |
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316 | } |
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317 | } |
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318 | |
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319 | ApplicationExpr * isIntrinsicCallExpr( Expression * expr ) { |
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320 | ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ); |
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321 | if ( ! appExpr ) return NULL; |
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322 | DeclarationWithType * function = getCalledFunction( appExpr->get_function() ); |
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323 | assert( function ); |
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324 | // check for Intrinsic only - don't want to remove all overridable ctor/dtors because autogenerated ctor/dtor |
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325 | // will call all member dtors, and some members may have a user defined dtor. |
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326 | return function->get_linkage() == LinkageSpec::Intrinsic ? appExpr : NULL; |
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327 | } |
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328 | |
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329 | namespace { |
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330 | template <typename Predicate> |
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331 | bool allofCtorDtor( Statement * stmt, const Predicate & pred ) { |
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332 | std::list< Expression * > callExprs; |
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333 | collectCtorDtorCalls( stmt, callExprs ); |
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334 | // if ( callExprs.empty() ) return false; // xxx - do I still need this check? |
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335 | return std::all_of( callExprs.begin(), callExprs.end(), pred); |
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336 | } |
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337 | } |
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338 | |
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339 | bool isIntrinsicSingleArgCallStmt( Statement * stmt ) { |
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340 | return allofCtorDtor( stmt, []( Expression * callExpr ){ |
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341 | if ( ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) { |
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342 | assert( ! appExpr->get_function()->get_results().empty() ); |
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343 | FunctionType *funcType = GenPoly::getFunctionType( appExpr->get_function()->get_results().front() ); |
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344 | assert( funcType ); |
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345 | return funcType->get_parameters().size() == 1; |
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346 | } |
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347 | return false; |
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348 | }); |
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349 | } |
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350 | |
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351 | bool isIntrinsicCallStmt( Statement * stmt ) { |
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352 | return allofCtorDtor( stmt, []( Expression * callExpr ) { |
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353 | return isIntrinsicCallExpr( callExpr ); |
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354 | }); |
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355 | } |
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356 | |
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357 | namespace { |
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358 | template<typename CallExpr> |
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359 | Expression *& callArg( CallExpr * callExpr, unsigned int pos ) { |
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360 | if ( pos >= callExpr->get_args().size() ) assertf( false, "asking for argument that doesn't exist. Return NULL/throw exception?" ); |
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361 | for ( Expression *& arg : callExpr->get_args() ) { |
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362 | if ( pos == 0 ) return arg; |
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363 | pos--; |
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364 | } |
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365 | assert( false ); |
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366 | } |
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367 | } |
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368 | |
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369 | Expression *& getCallArg( Expression * callExpr, unsigned int pos ) { |
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370 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( callExpr ) ) { |
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371 | return callArg( appExpr, pos ); |
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372 | } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( callExpr ) ) { |
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373 | return callArg( untypedExpr, pos ); |
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374 | } else { |
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375 | assertf( false, "Unexpected expression type passed to getCallArg" ); |
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376 | } |
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377 | } |
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378 | |
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379 | namespace { |
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380 | std::string funcName( Expression * func ) { |
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381 | if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( func ) ) { |
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382 | return nameExpr->get_name(); |
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383 | } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( func ) ) { |
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384 | return varExpr->get_var()->get_name(); |
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385 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( func ) ) { |
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386 | return funcName( castExpr->get_arg() ); |
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387 | } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( func ) ) { |
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388 | return memberExpr->get_member()->get_name(); |
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389 | } else { |
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390 | assertf( false, "Unexpected expression type being called as a function in call expression" ); |
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391 | } |
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392 | } |
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393 | } |
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394 | |
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395 | std::string getFunctionName( Expression * expr ) { |
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396 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) { |
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397 | return funcName( appExpr->get_function() ); |
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398 | } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * > ( expr ) ) { |
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399 | return funcName( untypedExpr->get_function() ); |
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400 | } else { |
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401 | std::cerr << expr << std::endl; |
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402 | assertf( false, "Unexpected expression type passed to getFunctionName" ); |
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403 | } |
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404 | } |
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405 | |
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406 | Type * getPointerBase( Type * type ) { |
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407 | if ( PointerType * ptrType = dynamic_cast< PointerType * >( type ) ) { |
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408 | return ptrType->get_base(); |
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409 | } else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) { |
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410 | return arrayType->get_base(); |
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411 | } else { |
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412 | return NULL; |
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413 | } |
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414 | } |
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415 | |
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416 | Type * isPointerType( Type * type ) { |
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417 | if ( getPointerBase( type ) ) return type; |
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418 | else return NULL; |
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419 | } |
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420 | |
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421 | class ConstExprChecker : public Visitor { |
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422 | public: |
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423 | ConstExprChecker() : isConstExpr( true ) {} |
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424 | |
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425 | virtual void visit( ApplicationExpr *applicationExpr ) { isConstExpr = false; } |
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426 | virtual void visit( UntypedExpr *untypedExpr ) { isConstExpr = false; } |
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427 | virtual void visit( NameExpr *nameExpr ) { |
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428 | // xxx - temporary hack, because 0 and 1 really should be constexprs, even though they technically aren't in Cforall today |
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429 | if ( nameExpr->get_name() != "0" && nameExpr->get_name() != "1" ) isConstExpr = false; |
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430 | } |
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431 | // virtual void visit( CastExpr *castExpr ) { isConstExpr = false; } |
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432 | virtual void visit( AddressExpr *addressExpr ) { |
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433 | // address of a variable or member expression is constexpr |
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434 | Expression * arg = addressExpr->get_arg(); |
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435 | if ( ! dynamic_cast< NameExpr * >( arg) && ! dynamic_cast< VariableExpr * >( arg ) && ! dynamic_cast< MemberExpr * >( arg ) && ! dynamic_cast< UntypedMemberExpr * >( arg ) ) isConstExpr = false; |
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436 | } |
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437 | virtual void visit( LabelAddressExpr *labAddressExpr ) { isConstExpr = false; } |
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438 | virtual void visit( UntypedMemberExpr *memberExpr ) { isConstExpr = false; } |
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439 | virtual void visit( MemberExpr *memberExpr ) { isConstExpr = false; } |
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440 | virtual void visit( VariableExpr *variableExpr ) { isConstExpr = false; } |
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441 | // these might be okay? |
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442 | // virtual void visit( SizeofExpr *sizeofExpr ); |
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443 | // virtual void visit( AlignofExpr *alignofExpr ); |
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444 | // virtual void visit( UntypedOffsetofExpr *offsetofExpr ); |
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445 | // virtual void visit( OffsetofExpr *offsetofExpr ); |
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446 | // virtual void visit( OffsetPackExpr *offsetPackExpr ); |
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447 | // virtual void visit( AttrExpr *attrExpr ); |
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448 | // virtual void visit( CommaExpr *commaExpr ); |
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449 | // virtual void visit( LogicalExpr *logicalExpr ); |
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450 | // virtual void visit( ConditionalExpr *conditionalExpr ); |
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451 | virtual void visit( TupleExpr *tupleExpr ) { isConstExpr = false; } |
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452 | virtual void visit( SolvedTupleExpr *tupleExpr ) { isConstExpr = false; } |
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453 | virtual void visit( TypeExpr *typeExpr ) { isConstExpr = false; } |
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454 | virtual void visit( AsmExpr *asmExpr ) { isConstExpr = false; } |
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455 | virtual void visit( UntypedValofExpr *valofExpr ) { isConstExpr = false; } |
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456 | virtual void visit( CompoundLiteralExpr *compLitExpr ) { isConstExpr = false; } |
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457 | |
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458 | bool isConstExpr; |
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459 | }; |
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460 | |
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461 | bool isConstExpr( Expression * expr ) { |
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462 | if ( expr ) { |
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463 | ConstExprChecker checker; |
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464 | expr->accept( checker ); |
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465 | return checker.isConstExpr; |
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466 | } |
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467 | return true; |
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468 | } |
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469 | |
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470 | bool isConstExpr( Initializer * init ) { |
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471 | if ( init ) { |
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472 | ConstExprChecker checker; |
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473 | init->accept( checker ); |
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474 | return checker.isConstExpr; |
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475 | } // if |
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476 | // for all intents and purposes, no initializer means const expr |
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477 | return true; |
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478 | } |
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479 | |
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480 | bool isConstructor( const std::string & str ) { return str == "?{}"; } |
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481 | bool isDestructor( const std::string & str ) { return str == "^?{}"; } |
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482 | bool isAssignment( const std::string & str ) { return str == "?=?"; } |
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483 | bool isCtorDtor( const std::string & str ) { return isConstructor( str ) || isDestructor( str ); } |
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484 | bool isCtorDtorAssign( const std::string & str ) { return isCtorDtor( str ) || isAssignment( str ); } |
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485 | |
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486 | FunctionDecl * isCopyFunction( Declaration * decl, const std::string & fname ) { |
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487 | FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl ); |
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488 | if ( ! function ) return 0; |
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489 | if ( function->get_name() != fname ) return 0; |
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490 | FunctionType * ftype = function->get_functionType(); |
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491 | if ( ftype->get_parameters().size() != 2 ) return 0; |
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492 | |
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493 | Type * t1 = ftype->get_parameters().front()->get_type(); |
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494 | Type * t2 = ftype->get_parameters().back()->get_type(); |
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495 | PointerType * ptrType = dynamic_cast< PointerType * > ( t1 ); |
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496 | assert( ptrType ); |
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497 | |
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498 | if ( ResolvExpr::typesCompatibleIgnoreQualifiers( ptrType->get_base(), t2, SymTab::Indexer() ) ) { |
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499 | return function; |
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500 | } else { |
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501 | return nullptr; |
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502 | } |
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503 | } |
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504 | |
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505 | FunctionDecl * isCopyConstructor( Declaration * decl ) { |
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506 | return isCopyFunction( decl, "?{}" ); |
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507 | } |
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508 | } |
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