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 | // FixInit.h -- |
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8 | // |
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9 | // Author : Rob Schluntz |
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10 | // Created On : Wed Jan 13 16:29:30 2016 |
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11 | // Last Modified By : Rob Schluntz |
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12 | // Last Modified On : Thu Mar 31 13:54:58 2016 |
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13 | // Update Count : 30 |
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14 | // |
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15 | |
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16 | #include <stack> |
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17 | #include <list> |
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18 | #include "RemoveInit.h" |
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19 | #include "SynTree/Declaration.h" |
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20 | #include "SynTree/Type.h" |
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21 | #include "SynTree/Expression.h" |
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22 | #include "SynTree/Statement.h" |
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23 | #include "SynTree/Initializer.h" |
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24 | #include "SynTree/Mutator.h" |
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25 | #include "GenPoly/PolyMutator.h" |
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26 | |
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27 | namespace InitTweak { |
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28 | namespace { |
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29 | const std::list<Label> noLabels; |
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30 | const std::list<Expression*> noDesignators; |
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31 | } |
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32 | |
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33 | class FixInit : public GenPoly::PolyMutator { |
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34 | public: |
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35 | static void fixInitializers( std::list< Declaration * > &translationUnit ); |
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36 | |
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37 | virtual ObjectDecl * mutate( ObjectDecl *objDecl ); |
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38 | |
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39 | virtual CompoundStmt * mutate( CompoundStmt * compoundStmt ); |
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40 | virtual Statement * mutate( ReturnStmt * returnStmt ); |
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41 | virtual Statement * mutate( BranchStmt * branchStmt ); |
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42 | |
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43 | private: |
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44 | // stack of list of statements - used to differentiate scopes |
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45 | std::list< std::list< Statement * > > dtorStmts; |
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46 | }; |
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47 | |
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48 | void fix( std::list< Declaration * > & translationUnit ) { |
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49 | FixInit::fixInitializers( translationUnit ); |
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50 | } |
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51 | |
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52 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
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53 | FixInit fixer; |
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54 | mutateAll( translationUnit, fixer ); |
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55 | } |
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56 | |
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57 | ObjectDecl *FixInit::mutate( ObjectDecl *objDecl ) { |
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58 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
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59 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
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60 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
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61 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
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62 | if ( objDecl->get_storageClass() == DeclarationNode::Static ) { |
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63 | // generate: |
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64 | // static bool __objName_uninitialized = true; |
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65 | // if (__objName_uninitialized) { |
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66 | // __ctor(__objName); |
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67 | // void dtor_atexit() { |
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68 | // __dtor(__objName); |
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69 | // } |
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70 | // on_exit(dtorOnExit, &__objName); |
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71 | // __objName_uninitialized = false; |
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72 | // } |
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73 | |
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74 | // generate first line |
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75 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
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76 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant( boolType->clone(), "1" ) ), noDesignators ); |
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77 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", DeclarationNode::Static, LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
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78 | isUninitializedVar->fixUniqueId(); |
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79 | |
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80 | // void dtor_atexit(...) {...} |
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81 | FunctionDecl * dtorCaller = new FunctionDecl( objDecl->get_mangleName() + "_dtor_atexit", DeclarationNode::NoStorageClass, LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), new CompoundStmt( noLabels ), false, false ); |
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82 | dtorCaller->fixUniqueId(); |
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83 | dtorCaller->get_statements()->get_kids().push_back( ctorInit->get_dtor() ); |
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84 | |
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85 | // on_exit(dtor_atexit); |
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86 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
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87 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
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88 | |
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89 | // __objName_uninitialized = false; |
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90 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
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91 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
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92 | setTrue->get_args().push_back( new ConstantExpr( Constant( boolType->clone(), "0" ) ) ); |
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93 | |
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94 | // generate body of if |
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95 | CompoundStmt * initStmts = new CompoundStmt( noLabels ); |
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96 | std::list< Statement * > & body = initStmts->get_kids(); |
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97 | body.push_back( ctor ); |
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98 | body.push_back( new DeclStmt( noLabels, dtorCaller ) ); |
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99 | body.push_back( new ExprStmt( noLabels, callAtexit ) ); |
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100 | body.push_back( new ExprStmt( noLabels, setTrue ) ); |
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101 | |
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102 | // put it all together |
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103 | IfStmt * ifStmt = new IfStmt( noLabels, new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
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104 | stmtsToAddAfter.push_back( new DeclStmt( noLabels, isUninitializedVar ) ); |
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105 | stmtsToAddAfter.push_back( ifStmt ); |
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106 | } else { |
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107 | stmtsToAddAfter.push_back( ctor ); |
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108 | dtorStmts.back().push_front( ctorInit->get_dtor() ); |
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109 | } |
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110 | objDecl->set_init( NULL ); |
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111 | ctorInit->set_ctor( NULL ); |
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112 | ctorInit->set_dtor( NULL ); // xxx - only destruct when constructing? Probably not? |
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113 | } else if ( Initializer * init = ctorInit->get_init() ) { |
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114 | objDecl->set_init( init ); |
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115 | ctorInit->set_init( NULL ); |
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116 | } else { |
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117 | // no constructor and no initializer, which is okay |
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118 | objDecl->set_init( NULL ); |
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119 | } |
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120 | delete ctorInit; |
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121 | } |
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122 | return objDecl; |
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123 | } |
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124 | |
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125 | template<typename Iterator, typename OutputIterator> |
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126 | void insertDtors( Iterator begin, Iterator end, OutputIterator out ) { |
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127 | for ( Iterator it = begin ; it != end ; ++it ) { |
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128 | // remove if instrinsic destructor statement |
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129 | // xxx - test user manually calling intrinsic functions - what happens? |
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130 | if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( *it ) ) { |
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131 | ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( exprStmt->get_expr() ); |
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132 | assert( appExpr ); |
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133 | VariableExpr * function = dynamic_cast< VariableExpr * >( appExpr->get_function() ); |
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134 | assert( function ); |
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135 | // check for Intrinsic only - don't want to remove all overridable dtors because autogenerated dtor |
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136 | // will call all member dtors, and some members may have a user defined dtor. |
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137 | if ( function->get_var()->get_linkage() == LinkageSpec::Intrinsic ) { |
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138 | // don't need to call intrinsic dtor, because it does nothing |
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139 | } else { |
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140 | // non-intrinsic dtors must be called |
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141 | *out++ = (*it)->clone(); |
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142 | } |
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143 | } else { |
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144 | // could also be a compound statement with a loop, in the case of an array |
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145 | *out++ = (*it)->clone(); |
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146 | } |
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147 | } |
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148 | } |
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149 | |
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150 | |
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151 | CompoundStmt * FixInit::mutate( CompoundStmt * compoundStmt ) { |
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152 | // mutate statements - this will also populate dtorStmts list. |
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153 | // don't want to dump all destructors when block is left, |
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154 | // just the destructors associated with variables defined in this block, |
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155 | // so push a new list to the top of the stack so that we can differentiate scopes |
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156 | dtorStmts.push_back( std::list<Statement *>() ); |
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157 | |
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158 | compoundStmt = PolyMutator::mutate( compoundStmt ); |
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159 | std::list< Statement * > & statements = compoundStmt->get_kids(); |
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160 | |
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161 | insertDtors( dtorStmts.back().begin(), dtorStmts.back().end(), back_inserter( statements ) ); |
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162 | |
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163 | deleteAll( dtorStmts.back() ); |
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164 | dtorStmts.pop_back(); |
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165 | return compoundStmt; |
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166 | } |
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167 | |
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168 | Statement * FixInit::mutate( ReturnStmt * returnStmt ) { |
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169 | for ( std::list< std::list< Statement * > >::reverse_iterator list = dtorStmts.rbegin(); list != dtorStmts.rend(); ++list ) { |
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170 | insertDtors( list->begin(), list->end(), back_inserter( stmtsToAdd ) ); |
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171 | } |
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172 | return returnStmt; |
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173 | } |
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174 | |
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175 | Statement * FixInit::mutate( BranchStmt * branchStmt ) { |
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176 | // TODO: adding to the end of a block isn't sufficient, since |
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177 | // return/break/goto should trigger destructor when block is left. |
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178 | switch( branchStmt->get_type() ) { |
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179 | case BranchStmt::Continue: |
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180 | case BranchStmt::Break: |
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181 | insertDtors( dtorStmts.back().begin(), dtorStmts.back().end(), back_inserter( stmtsToAdd ) ); |
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182 | break; |
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183 | case BranchStmt::Goto: |
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184 | // xxx |
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185 | // if goto leaves a block, generate dtors for every block it leaves |
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186 | // if goto is in same block but earlier statement, destruct every object that was defined after the statement |
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187 | break; |
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188 | default: |
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189 | assert( false ); |
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190 | } |
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191 | return branchStmt; |
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192 | } |
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193 | |
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194 | |
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195 | } // namespace InitTweak |
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196 | |
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197 | // Local Variables: // |
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198 | // tab-width: 4 // |
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199 | // mode: c++ // |
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200 | // compile-command: "make install" // |
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201 | // End: // |
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