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.cc -- |
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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 : Peter A. Buhr |
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12 | // Last Modified On : Wed Feb 13 18:15:56 2019 |
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13 | // Update Count : 76 |
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14 | // |
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15 | #include "FixInit.h" |
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16 | |
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17 | #include <stddef.h> // for NULL |
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18 | #include <algorithm> // for set_difference, copy_if |
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19 | #include <cassert> // for assert, strict_dynamic_cast |
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20 | #include <iostream> // for operator<<, ostream, basic_ost... |
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21 | #include <iterator> // for insert_iterator, back_inserter |
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22 | #include <list> // for _List_iterator, list, list<>::... |
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23 | #include <map> // for _Rb_tree_iterator, _Rb_tree_co... |
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24 | #include <memory> // for allocator_traits<>::value_type |
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25 | #include <set> // for set, set<>::value_type |
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26 | #include <unordered_map> // for unordered_map, unordered_map<>... |
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27 | #include <unordered_set> // for unordered_set |
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28 | #include <utility> // for pair |
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29 | |
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30 | #include "CodeGen/GenType.h" // for genPrettyType |
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31 | #include "CodeGen/OperatorTable.h" |
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32 | #include "Common/PassVisitor.h" // for PassVisitor, WithStmtsToAdd |
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33 | #include "Common/SemanticError.h" // for SemanticError |
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34 | #include "Common/UniqueName.h" // for UniqueName |
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35 | #include "Common/utility.h" // for CodeLocation, ValueGuard, toSt... |
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36 | #include "FixGlobalInit.h" // for fixGlobalInit |
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37 | #include "GenInit.h" // for genCtorDtor |
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38 | #include "GenPoly/GenPoly.h" // for getFunctionType |
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39 | #include "InitTweak.h" // for getFunctionName, getCallArg |
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40 | #include "Parser/LinkageSpec.h" // for C, Spec, Cforall, isBuiltin |
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41 | #include "ResolvExpr/Resolver.h" // for findVoidExpression |
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42 | #include "ResolvExpr/typeops.h" // for typesCompatible |
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43 | #include "SymTab/Autogen.h" // for genImplicitCall |
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44 | #include "SymTab/Indexer.h" // for Indexer |
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45 | #include "SymTab/Mangler.h" // for Mangler |
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46 | #include "SynTree/Attribute.h" // for Attribute |
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47 | #include "SynTree/Constant.h" // for Constant |
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48 | #include "SynTree/Declaration.h" // for ObjectDecl, FunctionDecl, Decl... |
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49 | #include "SynTree/Expression.h" // for UniqueExpr, VariableExpr, Unty... |
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50 | #include "SynTree/Initializer.h" // for ConstructorInit, SingleInit |
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51 | #include "SynTree/Label.h" // for Label, operator< |
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52 | #include "SynTree/Mutator.h" // for mutateAll, Mutator, maybeMutate |
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53 | #include "SynTree/Statement.h" // for ExprStmt, CompoundStmt, Branch... |
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54 | #include "SynTree/Type.h" // for Type, Type::StorageClasses |
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55 | #include "SynTree/TypeSubstitution.h" // for TypeSubstitution, operator<< |
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56 | #include "SynTree/DeclReplacer.h" // for DeclReplacer |
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57 | #include "SynTree/Visitor.h" // for acceptAll, maybeAccept |
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58 | #include "Validate/FindSpecialDecls.h" // for dtorStmt, dtorStructDestroy |
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59 | |
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60 | bool ctordtorp = false; // print all debug |
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61 | bool ctorp = false; // print ctor debug |
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62 | bool cpctorp = false; // print copy ctor debug |
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63 | bool dtorp = false; // print dtor debug |
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64 | #define PRINT( text ) if ( ctordtorp ) { text } |
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65 | #define CP_CTOR_PRINT( text ) if ( ctordtorp || cpctorp ) { text } |
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66 | #define DTOR_PRINT( text ) if ( ctordtorp || dtorp ) { text } |
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67 | |
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68 | namespace InitTweak { |
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69 | namespace { |
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70 | struct SelfAssignChecker { |
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71 | void previsit( ApplicationExpr * appExpr ); |
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72 | }; |
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73 | |
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74 | struct StmtExprResult { |
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75 | static void link( std::list< Declaration * > & translationUnit ); |
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76 | |
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77 | void previsit( StmtExpr * stmtExpr ); |
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78 | }; |
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79 | |
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80 | struct InsertImplicitCalls : public WithConstTypeSubstitution { |
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81 | /// wrap function application expressions as ImplicitCopyCtorExpr nodes so that it is easy to identify which |
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82 | /// function calls need their parameters to be copy constructed |
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83 | static void insert( std::list< Declaration * > & translationUnit ); |
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84 | |
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85 | Expression * postmutate( ApplicationExpr * appExpr ); |
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86 | }; |
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87 | |
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88 | struct ResolveCopyCtors final : public WithStmtsToAdd, public WithIndexer, public WithShortCircuiting, public WithTypeSubstitution, public WithVisitorRef<ResolveCopyCtors> { |
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89 | /// generate temporary ObjectDecls for each argument and return value of each ImplicitCopyCtorExpr, |
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90 | /// generate/resolve copy construction expressions for each, and generate/resolve destructors for both |
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91 | /// arguments and return value temporaries |
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92 | static void resolveImplicitCalls( std::list< Declaration * > & translationUnit ); |
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93 | |
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94 | Expression * postmutate( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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95 | void premutate( StmtExpr * stmtExpr ); |
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96 | void premutate( UniqueExpr * unqExpr ); |
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97 | |
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98 | /// create and resolve ctor/dtor expression: fname(var, [cpArg]) |
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99 | Expression * makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg = NULL ); |
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100 | /// true if type does not need to be copy constructed to ensure correctness |
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101 | bool skipCopyConstruct( Type * type ); |
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102 | void copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr, Type * formal ); |
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103 | void destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * impCpCtorExpr, Expression *& arg ); |
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104 | }; |
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105 | |
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106 | /// collects constructed object decls - used as a base class |
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107 | struct ObjDeclCollector : public WithGuards, public WithShortCircuiting { |
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108 | // use ordered data structure to maintain ordering for set_difference and for consistent error messages |
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109 | typedef std::list< ObjectDecl * > ObjectSet; |
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110 | void previsit( CompoundStmt *compoundStmt ); |
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111 | void previsit( DeclStmt *stmt ); |
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112 | |
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113 | // don't go into other functions |
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114 | void previsit( FunctionDecl * ) { visit_children = false; } |
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115 | |
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116 | protected: |
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117 | ObjectSet curVars; |
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118 | }; |
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119 | |
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120 | // debug |
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121 | template<typename ObjectSet> |
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122 | struct PrintSet { |
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123 | PrintSet( const ObjectSet & objs ) : objs( objs ) {} |
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124 | const ObjectSet & objs; |
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125 | }; |
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126 | template<typename ObjectSet> |
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127 | PrintSet<ObjectSet> printSet( const ObjectSet & objs ) { return PrintSet<ObjectSet>( objs ); } |
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128 | template<typename ObjectSet> |
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129 | std::ostream & operator<<( std::ostream & out, const PrintSet<ObjectSet> & set) { |
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130 | out << "{ "; |
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131 | for ( ObjectDecl * obj : set.objs ) { |
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132 | out << obj->get_name() << ", " ; |
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133 | } // for |
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134 | out << " }"; |
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135 | return out; |
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136 | } |
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137 | |
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138 | struct LabelFinder final : public ObjDeclCollector { |
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139 | typedef std::map< Label, ObjectSet > LabelMap; |
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140 | // map of Label -> live variables at that label |
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141 | LabelMap vars; |
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142 | |
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143 | typedef ObjDeclCollector Parent; |
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144 | using Parent::previsit; |
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145 | void previsit( Statement * stmt ); |
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146 | |
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147 | void previsit( CompoundStmt *compoundStmt ); |
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148 | void previsit( DeclStmt *stmt ); |
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149 | }; |
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150 | |
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151 | struct InsertDtors final : public ObjDeclCollector, public WithStmtsToAdd { |
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152 | /// insert destructor calls at the appropriate places. must happen before CtorInit nodes are removed |
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153 | /// (currently by FixInit) |
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154 | static void insert( std::list< Declaration * > & translationUnit ); |
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155 | |
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156 | typedef std::list< ObjectDecl * > OrderedDecls; |
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157 | typedef std::list< OrderedDecls > OrderedDeclsStack; |
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158 | |
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159 | InsertDtors( PassVisitor<LabelFinder> & finder ) : finder( finder ), labelVars( finder.pass.vars ) {} |
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160 | |
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161 | typedef ObjDeclCollector Parent; |
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162 | using Parent::previsit; |
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163 | |
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164 | void previsit( FunctionDecl * funcDecl ); |
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165 | |
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166 | void previsit( BranchStmt * stmt ); |
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167 | private: |
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168 | void handleGoto( BranchStmt * stmt ); |
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169 | |
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170 | PassVisitor<LabelFinder> & finder; |
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171 | LabelFinder::LabelMap & labelVars; |
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172 | OrderedDeclsStack reverseDeclOrder; |
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173 | }; |
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174 | |
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175 | class FixInit : public WithStmtsToAdd { |
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176 | public: |
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177 | /// expand each object declaration to use its constructor after it is declared. |
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178 | static void fixInitializers( std::list< Declaration * > &translationUnit ); |
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179 | |
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180 | DeclarationWithType * postmutate( ObjectDecl *objDecl ); |
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181 | |
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182 | std::list< Declaration * > staticDtorDecls; |
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183 | }; |
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184 | |
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185 | struct GenStructMemberCalls final : public WithGuards, public WithShortCircuiting, public WithIndexer, public WithVisitorRef<GenStructMemberCalls> { |
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186 | /// generate default/copy ctor and dtor calls for user-defined struct ctor/dtors |
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187 | /// for any member that is missing a corresponding ctor/dtor call. |
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188 | /// error if a member is used before constructed |
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189 | static void generate( std::list< Declaration * > & translationUnit ); |
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190 | |
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191 | void premutate( FunctionDecl * funcDecl ); |
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192 | DeclarationWithType * postmutate( FunctionDecl * funcDecl ); |
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193 | |
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194 | void premutate( MemberExpr * memberExpr ); |
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195 | void premutate( ApplicationExpr * appExpr ); |
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196 | |
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197 | /// Note: this post mutate used to be in a separate visitor. If this pass breaks, one place to examine is whether it is |
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198 | /// okay for this part of the recursion to occur alongside the rest. |
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199 | Expression * postmutate( UntypedExpr * expr ); |
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200 | |
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201 | SemanticErrorException errors; |
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202 | private: |
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203 | template< typename... Params > |
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204 | void emit( CodeLocation, const Params &... params ); |
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205 | |
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206 | FunctionDecl * function = nullptr; |
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207 | std::set< DeclarationWithType * > unhandled; |
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208 | std::map< DeclarationWithType *, CodeLocation > usedUninit; |
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209 | ObjectDecl * thisParam = nullptr; |
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210 | bool isCtor = false; // true if current function is a constructor |
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211 | StructDecl * structDecl = nullptr; |
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212 | }; |
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213 | |
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214 | struct FixCtorExprs final : public WithDeclsToAdd, public WithIndexer { |
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215 | /// expands ConstructorExpr nodes into comma expressions, using a temporary for the first argument |
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216 | static void fix( std::list< Declaration * > & translationUnit ); |
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217 | |
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218 | Expression * postmutate( ConstructorExpr * ctorExpr ); |
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219 | }; |
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220 | |
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221 | struct SplitExpressions : public WithShortCircuiting, public WithTypeSubstitution, public WithStmtsToAdd { |
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222 | /// add CompoundStmts around top-level expressions so that temporaries are destroyed in the correct places. |
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223 | static void split( std::list< Declaration * > &translationUnit ); |
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224 | |
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225 | Statement * postmutate( ExprStmt * stmt ); |
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226 | void premutate( TupleAssignExpr * expr ); |
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227 | }; |
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228 | } // namespace |
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229 | |
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230 | void fix( std::list< Declaration * > & translationUnit, bool inLibrary ) { |
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231 | PassVisitor<SelfAssignChecker> checker; |
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232 | acceptAll( translationUnit, checker ); |
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233 | |
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234 | // fixes StmtExpr to properly link to their resulting expression |
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235 | StmtExprResult::link( translationUnit ); |
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236 | |
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237 | // fixes ConstructorInit for global variables. should happen before fixInitializers. |
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238 | InitTweak::fixGlobalInit( translationUnit, inLibrary ); |
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239 | |
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240 | // must happen before ResolveCopyCtors because temporaries have to be inserted into the correct scope |
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241 | SplitExpressions::split( translationUnit ); |
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242 | |
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243 | InsertImplicitCalls::insert( translationUnit ); |
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244 | |
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245 | // Needs to happen before ResolveCopyCtors, because argument/return temporaries should not be considered in |
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246 | // error checking branch statements |
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247 | InsertDtors::insert( translationUnit ); |
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248 | |
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249 | ResolveCopyCtors::resolveImplicitCalls( translationUnit ); |
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250 | FixInit::fixInitializers( translationUnit ); |
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251 | GenStructMemberCalls::generate( translationUnit ); |
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252 | |
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253 | // Needs to happen after GenStructMemberCalls, since otherwise member constructors exprs |
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254 | // don't have the correct form, and a member can be constructed more than once. |
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255 | FixCtorExprs::fix( translationUnit ); |
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256 | } |
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257 | |
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258 | namespace { |
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259 | /// find and return the destructor used in `input`. If `input` is not a simple destructor call, generate a thunk |
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260 | /// that wraps the destructor, insert it into `stmtsToAdd` and return the new function declaration |
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261 | DeclarationWithType * getDtorFunc( ObjectDecl * objDecl, Statement * input, std::list< Statement * > & stmtsToAdd ) { |
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262 | // unwrap implicit statement wrapper |
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263 | Statement * dtor = input; |
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264 | assert( dtor ); |
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265 | std::list< Expression * > matches; |
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266 | collectCtorDtorCalls( dtor, matches ); |
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267 | |
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268 | if ( dynamic_cast< ExprStmt * >( dtor ) ) { |
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269 | // only one destructor call in the expression |
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270 | if ( matches.size() == 1 ) { |
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271 | DeclarationWithType * func = getFunction( matches.front() ); |
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272 | assertf( func, "getFunction failed to find function in %s", toString( matches.front() ).c_str() ); |
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273 | |
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274 | // cleanup argument must be a function, not an object (including function pointer) |
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275 | if ( FunctionDecl * dtorFunc = dynamic_cast< FunctionDecl * > ( func ) ) { |
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276 | if ( dtorFunc->type->forall.empty() ) { |
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277 | // simple case where the destructor is a monomorphic function call - can simply |
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278 | // use that function as the cleanup function. |
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279 | delete dtor; |
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280 | return func; |
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281 | } |
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282 | } |
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283 | } |
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284 | } |
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285 | |
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286 | // otherwise the cleanup is more complicated - need to build a single argument cleanup function that |
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287 | // wraps the more complicated code. |
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288 | static UniqueName dtorNamer( "__cleanup_dtor" ); |
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289 | std::string name = dtorNamer.newName(); |
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290 | if(name == "__cleanup_dtor8") { |
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291 | objDecl->print(std::cerr); |
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292 | std::cerr << "-----" << std::endl; |
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293 | dtor->print(std::cerr); |
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294 | } |
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295 | FunctionDecl * dtorFunc = FunctionDecl::newFunction( name, SymTab::genDefaultType( objDecl->type->stripReferences(), false ), new CompoundStmt() ); |
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296 | stmtsToAdd.push_back( new DeclStmt( dtorFunc ) ); |
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297 | |
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298 | // the original code contains uses of objDecl - replace them with the newly generated 'this' parameter. |
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299 | ObjectDecl * thisParam = getParamThis( dtorFunc->type ); |
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300 | Expression * replacement = new VariableExpr( thisParam ); |
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301 | |
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302 | Type * base = replacement->result->stripReferences(); |
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303 | if ( dynamic_cast< ArrayType * >( base ) || dynamic_cast< TupleType * > ( base ) ) { |
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304 | // need to cast away reference for array types, since the destructor is generated without the reference type, |
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305 | // and for tuple types since tuple indexing does not work directly on a reference |
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306 | replacement = new CastExpr( replacement, base->clone() ); |
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307 | } |
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308 | size_t replaced = DeclReplacer::replace( dtor, { std::make_pair( objDecl, replacement ) } ); |
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309 | if(replaced == 0) { |
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310 | std::cerr << "Failed to replace " << objDecl << std::endl; |
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311 | abort(); |
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312 | } |
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313 | dtorFunc->statements->push_back( strict_dynamic_cast<Statement *>( dtor ) ); |
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314 | |
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315 | return dtorFunc; |
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316 | } |
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317 | |
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318 | void StmtExprResult::link( std::list< Declaration * > & translationUnit ) { |
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319 | PassVisitor<StmtExprResult> linker; |
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320 | acceptAll( translationUnit, linker ); |
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321 | } |
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322 | |
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323 | void SplitExpressions::split( std::list< Declaration * > & translationUnit ) { |
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324 | PassVisitor<SplitExpressions> splitter; |
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325 | mutateAll( translationUnit, splitter ); |
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326 | } |
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327 | |
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328 | void InsertImplicitCalls::insert( std::list< Declaration * > & translationUnit ) { |
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329 | PassVisitor<InsertImplicitCalls> inserter; |
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330 | mutateAll( translationUnit, inserter ); |
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331 | } |
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332 | |
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333 | void ResolveCopyCtors::resolveImplicitCalls( std::list< Declaration * > & translationUnit ) { |
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334 | PassVisitor<ResolveCopyCtors> resolver; |
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335 | mutateAll( translationUnit, resolver ); |
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336 | } |
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337 | |
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338 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
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339 | PassVisitor<FixInit> fixer; |
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340 | |
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341 | // can't use mutateAll, because need to insert declarations at top-level |
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342 | // can't use DeclMutator, because sometimes need to insert IfStmt, etc. |
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343 | SemanticErrorException errors; |
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344 | for ( std::list< Declaration * >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) { |
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345 | try { |
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346 | maybeMutate( *i, fixer ); |
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347 | translationUnit.splice( i, fixer.pass.staticDtorDecls ); |
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348 | } catch( SemanticErrorException &e ) { |
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349 | errors.append( e ); |
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350 | } // try |
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351 | } // for |
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352 | if ( ! errors.isEmpty() ) { |
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353 | throw errors; |
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354 | } // if |
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355 | } |
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356 | |
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357 | void InsertDtors::insert( std::list< Declaration * > & translationUnit ) { |
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358 | PassVisitor<LabelFinder> finder; |
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359 | PassVisitor<InsertDtors> inserter( finder ); |
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360 | acceptAll( translationUnit, inserter ); |
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361 | } |
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362 | |
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363 | void GenStructMemberCalls::generate( std::list< Declaration * > & translationUnit ) { |
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364 | PassVisitor<GenStructMemberCalls> warner; |
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365 | mutateAll( translationUnit, warner ); |
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366 | } |
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367 | |
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368 | void FixCtorExprs::fix( std::list< Declaration * > & translationUnit ) { |
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369 | PassVisitor<FixCtorExprs> fixer; |
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370 | mutateAll( translationUnit, fixer ); |
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371 | } |
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372 | |
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373 | void StmtExprResult::previsit( StmtExpr * stmtExpr ) { |
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374 | // we might loose the result expression here so add a pointer to trace back |
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375 | assert( stmtExpr->result ); |
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376 | Type * result = stmtExpr->result; |
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377 | if ( ! result->isVoid() ) { |
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378 | CompoundStmt * body = stmtExpr->statements; |
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379 | assert( ! body->kids.empty() ); |
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380 | stmtExpr->resultExpr = strict_dynamic_cast< ExprStmt * >( body->kids.back() ); |
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381 | } |
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382 | } |
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383 | |
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384 | Statement * SplitExpressions::postmutate( ExprStmt * stmt ) { |
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385 | // wrap each top-level ExprStmt in a block so that destructors for argument and return temporaries are destroyed |
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386 | // in the correct places |
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387 | CompoundStmt * ret = new CompoundStmt( { stmt } ); |
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388 | return ret; |
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389 | } |
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390 | |
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391 | void SplitExpressions::premutate( TupleAssignExpr * ) { |
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392 | // don't do this within TupleAssignExpr, since it is already broken up into multiple expressions |
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393 | visit_children = false; |
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394 | } |
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395 | |
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396 | // Relatively simple structural comparison for expressions, needed to determine |
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397 | // if two expressions are "the same" (used to determine if self assignment occurs) |
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398 | struct StructuralChecker { |
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399 | Expression * stripCasts( Expression * expr ) { |
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400 | // this might be too permissive. It's possible that only particular casts are relevant. |
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401 | while ( CastExpr * cast = dynamic_cast< CastExpr * >( expr ) ) { |
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402 | expr = cast->arg; |
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403 | } |
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404 | return expr; |
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405 | } |
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406 | |
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407 | void previsit( Expression * ) { |
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408 | // anything else does not qualify |
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409 | isSimilar = false; |
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410 | } |
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411 | |
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412 | template<typename T> |
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413 | T * cast( Expression * node ) { |
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414 | // all expressions need to ignore casts, so this bit has been factored out |
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415 | return dynamic_cast< T * >( stripCasts( node ) ); |
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416 | } |
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417 | |
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418 | // ignore casts |
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419 | void previsit( CastExpr * ) {} |
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420 | |
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421 | void previsit( MemberExpr * memExpr ) { |
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422 | if ( MemberExpr * otherMember = cast< MemberExpr >( other ) ) { |
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423 | if ( otherMember->member == memExpr->member ) { |
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424 | other = otherMember->aggregate; |
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425 | return; |
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426 | } |
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427 | } |
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428 | isSimilar = false; |
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429 | } |
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430 | |
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431 | void previsit( VariableExpr * varExpr ) { |
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432 | if ( VariableExpr * otherVar = cast< VariableExpr >( other ) ) { |
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433 | if ( otherVar->var == varExpr->var ) { |
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434 | return; |
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435 | } |
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436 | } |
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437 | isSimilar = false; |
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438 | } |
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439 | |
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440 | void previsit( AddressExpr * ) { |
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441 | if ( AddressExpr * addrExpr = cast< AddressExpr >( other ) ) { |
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442 | other = addrExpr->arg; |
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443 | return; |
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444 | } |
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445 | isSimilar = false; |
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446 | } |
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447 | |
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448 | Expression * other = nullptr; |
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449 | bool isSimilar = true; |
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450 | }; |
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451 | |
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452 | bool structurallySimilar( Expression * e1, Expression * e2 ) { |
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453 | PassVisitor<StructuralChecker> checker; |
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454 | checker.pass.other = e2; |
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455 | e1->accept( checker ); |
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456 | return checker.pass.isSimilar; |
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457 | } |
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458 | |
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459 | void SelfAssignChecker::previsit( ApplicationExpr * appExpr ) { |
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460 | DeclarationWithType * function = getFunction( appExpr ); |
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461 | if ( function->name == "?=?" ) { // doesn't use isAssignment, because ?+=?, etc. should not count as self-assignment |
---|
462 | if ( appExpr->args.size() == 2 ) { |
---|
463 | // check for structural similarity (same variable use, ignore casts, etc. - but does not look too deeply, anything looking like a function is off limits) |
---|
464 | if ( structurallySimilar( appExpr->args.front(), appExpr->args.back() ) ) { |
---|
465 | SemanticWarning( appExpr->location, Warning::SelfAssignment, toCString( appExpr->args.front() ) ); |
---|
466 | } |
---|
467 | } |
---|
468 | } |
---|
469 | } |
---|
470 | |
---|
471 | Expression * InsertImplicitCalls::postmutate( ApplicationExpr * appExpr ) { |
---|
472 | if ( VariableExpr * function = dynamic_cast< VariableExpr * > ( appExpr->get_function() ) ) { |
---|
473 | if ( function->var->linkage.is_builtin ) { |
---|
474 | // optimization: don't need to copy construct in order to call intrinsic functions |
---|
475 | return appExpr; |
---|
476 | } else if ( DeclarationWithType * funcDecl = dynamic_cast< DeclarationWithType * > ( function->get_var() ) ) { |
---|
477 | FunctionType * ftype = dynamic_cast< FunctionType * >( GenPoly::getFunctionType( funcDecl->get_type() ) ); |
---|
478 | assertf( ftype, "Function call without function type: %s", toString( funcDecl ).c_str() ); |
---|
479 | if ( CodeGen::isConstructor( funcDecl->get_name() ) && ftype->parameters.size() == 2 ) { |
---|
480 | Type * t1 = getPointerBase( ftype->parameters.front()->get_type() ); |
---|
481 | Type * t2 = ftype->parameters.back()->get_type(); |
---|
482 | assert( t1 ); |
---|
483 | |
---|
484 | if ( ResolvExpr::typesCompatible( t1, t2, SymTab::Indexer() ) ) { |
---|
485 | // optimization: don't need to copy construct in order to call a copy constructor |
---|
486 | return appExpr; |
---|
487 | } // if |
---|
488 | } else if ( CodeGen::isDestructor( funcDecl->get_name() ) ) { |
---|
489 | // correctness: never copy construct arguments to a destructor |
---|
490 | return appExpr; |
---|
491 | } // if |
---|
492 | } // if |
---|
493 | } // if |
---|
494 | CP_CTOR_PRINT( std::cerr << "InsertImplicitCalls: adding a wrapper " << appExpr << std::endl; ) |
---|
495 | |
---|
496 | // wrap each function call so that it is easy to identify nodes that have to be copy constructed |
---|
497 | ImplicitCopyCtorExpr * expr = new ImplicitCopyCtorExpr( appExpr ); |
---|
498 | // Move the type substitution to the new top-level, if it is attached to the appExpr. |
---|
499 | // Ensure it is not deleted with the ImplicitCopyCtorExpr by removing it before deletion. |
---|
500 | // The substitution is needed to obtain the type of temporary variables so that copy constructor |
---|
501 | // calls can be resolved. |
---|
502 | assert( env ); |
---|
503 | std::swap( expr->env, appExpr->env ); |
---|
504 | return expr; |
---|
505 | } |
---|
506 | |
---|
507 | bool ResolveCopyCtors::skipCopyConstruct( Type * type ) { return ! isConstructable( type ); } |
---|
508 | |
---|
509 | Expression * ResolveCopyCtors::makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg ) { |
---|
510 | assert( var ); |
---|
511 | // arrays are not copy constructed, so this should always be an ExprStmt |
---|
512 | ImplicitCtorDtorStmt * stmt = genCtorDtor( fname, var, cpArg ); |
---|
513 | assertf( stmt, "ResolveCopyCtors: genCtorDtor returned nullptr: %s / %s / %s", fname.c_str(), toString( var ).c_str(), toString( cpArg ).c_str() ); |
---|
514 | ExprStmt * exprStmt = strict_dynamic_cast< ExprStmt * >( stmt->callStmt ); |
---|
515 | Expression * resolved = exprStmt->expr; |
---|
516 | exprStmt->expr = nullptr; // take ownership of expr |
---|
517 | |
---|
518 | // resolve copy constructor |
---|
519 | // should only be one alternative for copy ctor and dtor expressions, since all arguments are fixed |
---|
520 | // (VariableExpr and already resolved expression) |
---|
521 | CP_CTOR_PRINT( std::cerr << "ResolvingCtorDtor " << resolved << std::endl; ) |
---|
522 | ResolvExpr::findVoidExpression( resolved, indexer ); |
---|
523 | assert( resolved ); |
---|
524 | if ( resolved->env ) { |
---|
525 | // Extract useful information and discard new environments. Keeping them causes problems in PolyMutator passes. |
---|
526 | env->add( *resolved->env ); |
---|
527 | delete resolved->env; |
---|
528 | resolved->env = nullptr; |
---|
529 | } // if |
---|
530 | delete stmt; |
---|
531 | if ( TupleAssignExpr * assign = dynamic_cast< TupleAssignExpr * >( resolved ) ) { |
---|
532 | // fix newly generated StmtExpr |
---|
533 | premutate( assign->stmtExpr ); |
---|
534 | } |
---|
535 | return resolved; |
---|
536 | } |
---|
537 | |
---|
538 | void ResolveCopyCtors::copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr, Type * formal ) { |
---|
539 | static UniqueName tempNamer("_tmp_cp"); |
---|
540 | assert( env ); |
---|
541 | CP_CTOR_PRINT( std::cerr << "Type Substitution: " << *env << std::endl; ) |
---|
542 | assert( arg->result ); |
---|
543 | Type * result = arg->result; |
---|
544 | if ( skipCopyConstruct( result ) ) return; // skip certain non-copyable types |
---|
545 | |
---|
546 | // type may involve type variables, so apply type substitution to get temporary variable's actual type, |
---|
547 | // since result type may not be substituted (e.g., if the type does not appear in the parameter list) |
---|
548 | // Use applyFree so that types bound in function pointers are not substituted, e.g. in forall(dtype T) void (*)(T). |
---|
549 | env->applyFree( result ); |
---|
550 | ObjectDecl * tmp = ObjectDecl::newObject( "__tmp", result, nullptr ); |
---|
551 | tmp->get_type()->set_const( false ); |
---|
552 | |
---|
553 | // create and resolve copy constructor |
---|
554 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for an argument" << std::endl; ) |
---|
555 | Expression * cpCtor = makeCtorDtor( "?{}", tmp, arg ); |
---|
556 | |
---|
557 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( cpCtor ) ) { |
---|
558 | // if the chosen constructor is intrinsic, the copy is unnecessary, so |
---|
559 | // don't create the temporary and don't call the copy constructor |
---|
560 | VariableExpr * function = strict_dynamic_cast< VariableExpr * >( appExpr->function ); |
---|
561 | if ( function->var->linkage == LinkageSpec::Intrinsic ) { |
---|
562 | // arguments that need to be boxed need a temporary regardless of whether the copy constructor is intrinsic, |
---|
563 | // so that the object isn't changed inside of the polymorphic function |
---|
564 | if ( ! GenPoly::needsBoxing( formal, result, impCpCtorExpr->callExpr, env ) ) return; |
---|
565 | // xxx - leaking tmp |
---|
566 | } |
---|
567 | } |
---|
568 | |
---|
569 | // set a unique name for the temporary once it's certain the call is necessary |
---|
570 | tmp->name = tempNamer.newName(); |
---|
571 | |
---|
572 | // replace argument to function call with temporary |
---|
573 | stmtsToAddBefore.push_back( new DeclStmt( tmp ) ); |
---|
574 | arg = cpCtor; |
---|
575 | destructRet( tmp, impCpCtorExpr, arg ); |
---|
576 | |
---|
577 | // impCpCtorExpr->dtors.push_front( makeCtorDtor( "^?{}", tmp ) ); |
---|
578 | } |
---|
579 | |
---|
580 | void ResolveCopyCtors::destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * /*impCpCtorExpr*/, Expression *& arg ) { |
---|
581 | // TODO: refactor code for generating cleanup attribute, since it's common and reused in ~3-4 places |
---|
582 | // check for existing cleanup attribute before adding another(?) |
---|
583 | // need to add __Destructor for _tmp_cp variables as well |
---|
584 | |
---|
585 | assertf( Validate::dtorStruct && Validate::dtorStruct->members.size() == 2, "Destructor generation requires __Destructor definition." ); |
---|
586 | assertf( Validate::dtorStructDestroy, "Destructor generation requires __destroy_Destructor." ); |
---|
587 | |
---|
588 | // generate a __Destructor for ret that calls the destructor |
---|
589 | Expression * dtor = makeCtorDtor( "^?{}", ret ); |
---|
590 | |
---|
591 | // if the chosen destructor is intrinsic, elide the generated dtor handler |
---|
592 | if ( arg && isIntrinsicCallExpr( dtor ) ) { |
---|
593 | arg = new CommaExpr( arg, new VariableExpr( ret ) ); |
---|
594 | return; |
---|
595 | } |
---|
596 | |
---|
597 | if ( ! dtor->env ) dtor->env = maybeClone( env ); |
---|
598 | DeclarationWithType * dtorFunc = getDtorFunc( ret, new ExprStmt( dtor ), stmtsToAddBefore ); |
---|
599 | |
---|
600 | StructInstType * dtorStructType = new StructInstType( Type::Qualifiers(), Validate::dtorStruct ); |
---|
601 | dtorStructType->parameters.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) ); |
---|
602 | |
---|
603 | // cast destructor pointer to void (*)(void *), to silence GCC incompatible pointer warnings |
---|
604 | FunctionType * dtorFtype = new FunctionType( Type::Qualifiers(), false ); |
---|
605 | dtorFtype->parameters.push_back( ObjectDecl::newObject( "", new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), nullptr ) ); |
---|
606 | Type * dtorType = new PointerType( Type::Qualifiers(), dtorFtype ); |
---|
607 | |
---|
608 | static UniqueName namer( "_ret_dtor" ); |
---|
609 | ObjectDecl * retDtor = ObjectDecl::newObject( namer.newName(), dtorStructType, new ListInit( { new SingleInit( new ConstantExpr( Constant::null() ) ), new SingleInit( new CastExpr( new VariableExpr( dtorFunc ), dtorType ) ) } ) ); |
---|
610 | retDtor->attributes.push_back( new Attribute( "cleanup", { new VariableExpr( Validate::dtorStructDestroy ) } ) ); |
---|
611 | stmtsToAddBefore.push_back( new DeclStmt( retDtor ) ); |
---|
612 | |
---|
613 | if ( arg ) { |
---|
614 | Expression * member = new MemberExpr( strict_dynamic_cast<DeclarationWithType *>( Validate::dtorStruct->members.front() ), new VariableExpr( retDtor ) ); |
---|
615 | Expression * object = new CastExpr( new AddressExpr( new VariableExpr( ret ) ), new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ) ); |
---|
616 | Expression * assign = createBitwiseAssignment( member, object ); |
---|
617 | arg = new CommaExpr( new CommaExpr( arg, assign ), new VariableExpr( ret ) ); |
---|
618 | } |
---|
619 | |
---|
620 | // impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
---|
621 | } |
---|
622 | |
---|
623 | Expression * ResolveCopyCtors::postmutate( ImplicitCopyCtorExpr *impCpCtorExpr ) { |
---|
624 | CP_CTOR_PRINT( std::cerr << "ResolveCopyCtors: " << impCpCtorExpr << std::endl; ) |
---|
625 | |
---|
626 | ApplicationExpr * appExpr = impCpCtorExpr->callExpr; |
---|
627 | ObjectDecl * returnDecl = nullptr; |
---|
628 | |
---|
629 | // take each argument and attempt to copy construct it. |
---|
630 | FunctionType * ftype = GenPoly::getFunctionType( appExpr->function->result ); |
---|
631 | assert( ftype ); |
---|
632 | auto & params = ftype->parameters; |
---|
633 | auto iter = params.begin(); |
---|
634 | for ( Expression * & arg : appExpr->args ) { |
---|
635 | Type * formal = nullptr; |
---|
636 | if ( iter != params.end() ) { // does not copy construct C-style variadic arguments |
---|
637 | DeclarationWithType * param = *iter++; |
---|
638 | formal = param->get_type(); |
---|
639 | } |
---|
640 | |
---|
641 | copyConstructArg( arg, impCpCtorExpr, formal ); |
---|
642 | } // for |
---|
643 | |
---|
644 | // each return value from the call needs to be connected with an ObjectDecl at the call site, which is |
---|
645 | // initialized with the return value and is destructed later |
---|
646 | // xxx - handle named return values? |
---|
647 | Type * result = appExpr->result; |
---|
648 | if ( ! result->isVoid() ) { |
---|
649 | static UniqueName retNamer("_tmp_cp_ret"); |
---|
650 | result = result->clone(); |
---|
651 | env->apply( result ); |
---|
652 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
---|
653 | ret->type->set_const( false ); |
---|
654 | returnDecl = ret; |
---|
655 | stmtsToAddBefore.push_back( new DeclStmt( ret ) ); |
---|
656 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for a return" << std::endl; ) |
---|
657 | } // for |
---|
658 | CP_CTOR_PRINT( std::cerr << "after Resolving: " << impCpCtorExpr << std::endl; ) |
---|
659 | // ------------------------------------------------------ |
---|
660 | |
---|
661 | CP_CTOR_PRINT( std::cerr << "Coming out the back..." << impCpCtorExpr << std::endl; ) |
---|
662 | |
---|
663 | // detach fields from wrapper node so that it can be deleted without deleting too much |
---|
664 | impCpCtorExpr->callExpr = nullptr; |
---|
665 | std::swap( impCpCtorExpr->env, appExpr->env ); |
---|
666 | assert( impCpCtorExpr->env == nullptr ); |
---|
667 | delete impCpCtorExpr; |
---|
668 | |
---|
669 | if ( returnDecl ) { |
---|
670 | Expression * assign = createBitwiseAssignment( new VariableExpr( returnDecl ), appExpr ); |
---|
671 | if ( ! dynamic_cast< ReferenceType * >( result ) ) { |
---|
672 | // destructing reference returns is bad because it can cause multiple destructor calls to the same object - the returned object is not a temporary |
---|
673 | destructRet( returnDecl, impCpCtorExpr, assign ); |
---|
674 | } else { |
---|
675 | assign = new CommaExpr( assign, new VariableExpr( returnDecl ) ); |
---|
676 | } |
---|
677 | // move env from appExpr to retExpr |
---|
678 | std::swap( assign->env, appExpr->env ); |
---|
679 | return assign; |
---|
680 | } else { |
---|
681 | return appExpr; |
---|
682 | } // if |
---|
683 | } |
---|
684 | |
---|
685 | void ResolveCopyCtors::premutate( StmtExpr * stmtExpr ) { |
---|
686 | // function call temporaries should be placed at statement-level, rather than nested inside of a new statement expression, |
---|
687 | // since temporaries can be shared across sub-expressions, e.g. |
---|
688 | // [A, A] f(); // decl |
---|
689 | // g([A] x, [A] y); // decl |
---|
690 | // g(f()); // call |
---|
691 | // f is executed once, so the return temporary is shared across the tuple constructors for x and y. |
---|
692 | // Explicitly mutating children instead of mutating the inner compound statement forces the temporaries to be added |
---|
693 | // to the outer context, rather than inside of the statement expression. |
---|
694 | visit_children = false; |
---|
695 | |
---|
696 | assert( env ); |
---|
697 | |
---|
698 | indexer.enterScope(); |
---|
699 | // visit all statements |
---|
700 | std::list< Statement * > & stmts = stmtExpr->statements->get_kids(); |
---|
701 | for ( Statement *& stmt : stmts ) { |
---|
702 | stmt = stmt->acceptMutator( *visitor ); |
---|
703 | } // for |
---|
704 | indexer.leaveScope(); |
---|
705 | |
---|
706 | assert( stmtExpr->result ); |
---|
707 | Type * result = stmtExpr->result; |
---|
708 | if ( ! result->isVoid() ) { |
---|
709 | static UniqueName retNamer("_tmp_stmtexpr_ret"); |
---|
710 | |
---|
711 | result = result->clone(); |
---|
712 | env->apply( result ); |
---|
713 | if ( ! InitTweak::isConstructable( result ) ) { |
---|
714 | delete result; |
---|
715 | return; |
---|
716 | } |
---|
717 | |
---|
718 | // create variable that will hold the result of the stmt expr |
---|
719 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
---|
720 | ret->type->set_const( false ); |
---|
721 | stmtsToAddBefore.push_back( new DeclStmt( ret ) ); |
---|
722 | |
---|
723 | assertf( |
---|
724 | stmtExpr->resultExpr, |
---|
725 | "Statement-Expression should have a resulting expression at %s:%d", |
---|
726 | stmtExpr->location.filename.c_str(), |
---|
727 | stmtExpr->location.first_line |
---|
728 | ); |
---|
729 | |
---|
730 | ExprStmt * last = stmtExpr->resultExpr; |
---|
731 | try { |
---|
732 | last->expr = makeCtorDtor( "?{}", ret, last->expr ); |
---|
733 | } catch(...) { |
---|
734 | std::cerr << "*CFA internal error: "; |
---|
735 | std::cerr << "can't resolve implicit constructor"; |
---|
736 | std::cerr << " at " << stmtExpr->location.filename; |
---|
737 | std::cerr << ":" << stmtExpr->location.first_line << std::endl; |
---|
738 | |
---|
739 | abort(); |
---|
740 | } |
---|
741 | |
---|
742 | // add destructors after current statement |
---|
743 | stmtsToAddAfter.push_back( new ExprStmt( makeCtorDtor( "^?{}", ret ) ) ); |
---|
744 | |
---|
745 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
746 | assert( ! stmts.empty() ); |
---|
747 | |
---|
748 | // if there is a return decl, add a use as the last statement; will not have return decl on non-constructable returns |
---|
749 | stmts.push_back( new ExprStmt( new VariableExpr( ret ) ) ); |
---|
750 | } // if |
---|
751 | |
---|
752 | assert( stmtExpr->returnDecls.empty() ); |
---|
753 | assert( stmtExpr->dtors.empty() ); |
---|
754 | } |
---|
755 | |
---|
756 | // to prevent warnings (‘_unq0’ may be used uninitialized in this function), |
---|
757 | // insert an appropriate zero initializer for UniqueExpr temporaries. |
---|
758 | Initializer * makeInit( Type * t ) { |
---|
759 | if ( StructInstType * inst = dynamic_cast< StructInstType * >( t ) ) { |
---|
760 | // initizer for empty struct must be empty |
---|
761 | if ( inst->baseStruct->members.empty() ) return new ListInit({}); |
---|
762 | } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( t ) ) { |
---|
763 | // initizer for empty union must be empty |
---|
764 | if ( inst->baseUnion->members.empty() ) return new ListInit({}); |
---|
765 | } |
---|
766 | |
---|
767 | return new ListInit( { new SingleInit( new ConstantExpr( Constant::from_int( 0 ) ) ) } ); |
---|
768 | } |
---|
769 | |
---|
770 | void ResolveCopyCtors::premutate( UniqueExpr * unqExpr ) { |
---|
771 | visit_children = false; |
---|
772 | // xxx - hack to prevent double-handling of unique exprs, otherwise too many temporary variables and destructors are generated |
---|
773 | static std::unordered_map< int, UniqueExpr * > unqMap; |
---|
774 | if ( ! unqMap.count( unqExpr->get_id() ) ) { |
---|
775 | // resolve expr and find its |
---|
776 | |
---|
777 | ImplicitCopyCtorExpr * impCpCtorExpr = dynamic_cast< ImplicitCopyCtorExpr * >( unqExpr->expr ); |
---|
778 | // PassVisitor<ResolveCopyCtors> fixer; |
---|
779 | unqExpr->expr = unqExpr->expr->acceptMutator( *visitor ); |
---|
780 | |
---|
781 | // it should never be necessary to wrap a void-returning expression in a UniqueExpr - if this assumption changes, this needs to be rethought |
---|
782 | assert( unqExpr->result ); |
---|
783 | if ( impCpCtorExpr ) { |
---|
784 | CommaExpr * comma = strict_dynamic_cast< CommaExpr * >( unqExpr->expr ); |
---|
785 | VariableExpr * var = strict_dynamic_cast<VariableExpr *>( comma->arg2 ); |
---|
786 | // note the variable used as the result from the call |
---|
787 | unqExpr->var = var->clone(); |
---|
788 | } else { |
---|
789 | // expr isn't a call expr, so create a new temporary variable to use to hold the value of the unique expression |
---|
790 | unqExpr->object = ObjectDecl::newObject( toString("_unq", unqExpr->get_id()), unqExpr->result->clone(), makeInit( unqExpr->result ) ); |
---|
791 | unqExpr->var = new VariableExpr( unqExpr->object ); |
---|
792 | } |
---|
793 | |
---|
794 | // stmtsToAddBefore.splice( stmtsToAddBefore.end(), fixer.pass.stmtsToAddBefore ); |
---|
795 | // stmtsToAddAfter.splice( stmtsToAddAfter.end(), fixer.pass.stmtsToAddAfter ); |
---|
796 | unqMap[unqExpr->get_id()] = unqExpr; |
---|
797 | } else { |
---|
798 | // take data from other UniqueExpr to ensure consistency |
---|
799 | delete unqExpr->get_expr(); |
---|
800 | unqExpr->expr = unqMap[unqExpr->get_id()]->expr->clone(); |
---|
801 | delete unqExpr->result; |
---|
802 | unqExpr->result = maybeClone( unqExpr->expr->result ); |
---|
803 | } |
---|
804 | } |
---|
805 | |
---|
806 | DeclarationWithType * FixInit::postmutate( ObjectDecl *objDecl ) { |
---|
807 | // since this removes the init field from objDecl, it must occur after children are mutated (i.e. postmutate) |
---|
808 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
809 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
810 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
811 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
---|
812 | if ( objDecl->get_storageClasses().is_static ) { |
---|
813 | // originally wanted to take advantage of gcc nested functions, but |
---|
814 | // we get memory errors with this approach. To remedy this, the static |
---|
815 | // variable is hoisted when the destructor needs to be called. |
---|
816 | // |
---|
817 | // generate: |
---|
818 | // static T __objName_static_varN; |
---|
819 | // void __objName_dtor_atexitN() { |
---|
820 | // __dtor__...; |
---|
821 | // } |
---|
822 | // int f(...) { |
---|
823 | // ... |
---|
824 | // static bool __objName_uninitialized = true; |
---|
825 | // if (__objName_uninitialized) { |
---|
826 | // __ctor(__objName); |
---|
827 | // __objName_uninitialized = false; |
---|
828 | // atexit(__objName_dtor_atexitN); |
---|
829 | // } |
---|
830 | // ... |
---|
831 | // } |
---|
832 | |
---|
833 | static UniqueName dtorCallerNamer( "_dtor_atexit" ); |
---|
834 | |
---|
835 | // static bool __objName_uninitialized = true |
---|
836 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
---|
837 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant::from_int( 1 ) ) ); |
---|
838 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", Type::StorageClasses( Type::Static ), LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
---|
839 | isUninitializedVar->fixUniqueId(); |
---|
840 | |
---|
841 | // __objName_uninitialized = false; |
---|
842 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
843 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
---|
844 | setTrue->get_args().push_back( new ConstantExpr( Constant::from_int( 0 ) ) ); |
---|
845 | |
---|
846 | // generate body of if |
---|
847 | CompoundStmt * initStmts = new CompoundStmt(); |
---|
848 | std::list< Statement * > & body = initStmts->get_kids(); |
---|
849 | body.push_back( ctor ); |
---|
850 | body.push_back( new ExprStmt( setTrue ) ); |
---|
851 | |
---|
852 | // put it all together |
---|
853 | IfStmt * ifStmt = new IfStmt( new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
---|
854 | stmtsToAddAfter.push_back( new DeclStmt( isUninitializedVar ) ); |
---|
855 | stmtsToAddAfter.push_back( ifStmt ); |
---|
856 | |
---|
857 | Statement * dtor = ctorInit->get_dtor(); |
---|
858 | objDecl->set_init( nullptr ); |
---|
859 | ctorInit->set_ctor( nullptr ); |
---|
860 | ctorInit->set_dtor( nullptr ); |
---|
861 | if ( dtor ) { |
---|
862 | // if the object has a non-trivial destructor, have to |
---|
863 | // hoist it and the object into the global space and |
---|
864 | // call the destructor function with atexit. |
---|
865 | |
---|
866 | Statement * dtorStmt = dtor->clone(); |
---|
867 | |
---|
868 | // void __objName_dtor_atexitN(...) {...} |
---|
869 | FunctionDecl * dtorCaller = new FunctionDecl( objDecl->get_mangleName() + dtorCallerNamer.newName(), Type::StorageClasses( Type::Static ), LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), new CompoundStmt() ); |
---|
870 | dtorCaller->fixUniqueId(); |
---|
871 | dtorCaller->get_statements()->push_back( dtorStmt ); |
---|
872 | |
---|
873 | // atexit(dtor_atexit); |
---|
874 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
---|
875 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
---|
876 | |
---|
877 | body.push_back( new ExprStmt( callAtexit ) ); |
---|
878 | |
---|
879 | // hoist variable and dtor caller decls to list of decls that will be added into global scope |
---|
880 | staticDtorDecls.push_back( objDecl ); |
---|
881 | staticDtorDecls.push_back( dtorCaller ); |
---|
882 | |
---|
883 | // need to rename object uniquely since it now appears |
---|
884 | // at global scope and there could be multiple function-scoped |
---|
885 | // static variables with the same name in different functions. |
---|
886 | // Note: it isn't sufficient to modify only the mangleName, because |
---|
887 | // then subsequent Indexer passes can choke on seeing the object's name |
---|
888 | // if another object has the same name and type. An unfortunate side-effect |
---|
889 | // of renaming the object is that subsequent NameExprs may fail to resolve, |
---|
890 | // but there shouldn't be any remaining past this point. |
---|
891 | static UniqueName staticNamer( "_static_var" ); |
---|
892 | objDecl->set_name( objDecl->get_name() + staticNamer.newName() ); |
---|
893 | objDecl->set_mangleName( SymTab::Mangler::mangle( objDecl ) ); |
---|
894 | |
---|
895 | // xxx - temporary hack: need to return a declaration, but want to hoist the current object out of this scope |
---|
896 | // create a new object which is never used |
---|
897 | static UniqueName dummyNamer( "_dummy" ); |
---|
898 | ObjectDecl * dummy = new ObjectDecl( dummyNamer.newName(), Type::StorageClasses( Type::Static ), LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), 0, std::list< Attribute * >{ new Attribute("unused") } ); |
---|
899 | delete ctorInit; |
---|
900 | return dummy; |
---|
901 | } |
---|
902 | } else { |
---|
903 | ImplicitCtorDtorStmt * implicit = strict_dynamic_cast< ImplicitCtorDtorStmt * > ( ctor ); |
---|
904 | ExprStmt * ctorStmt = dynamic_cast< ExprStmt * >( implicit->callStmt ); |
---|
905 | ApplicationExpr * ctorCall = nullptr; |
---|
906 | if ( ctorStmt && (ctorCall = isIntrinsicCallExpr( ctorStmt->expr )) && ctorCall->get_args().size() == 2 ) { |
---|
907 | // clean up intrinsic copy constructor calls by making them into SingleInits |
---|
908 | Expression * ctorArg = ctorCall->args.back(); |
---|
909 | std::swap( ctorArg->env, ctorCall->env ); |
---|
910 | objDecl->init = new SingleInit( ctorArg ); |
---|
911 | |
---|
912 | ctorCall->args.pop_back(); |
---|
913 | } else { |
---|
914 | stmtsToAddAfter.push_back( ctor ); |
---|
915 | objDecl->init = nullptr; |
---|
916 | ctorInit->ctor = nullptr; |
---|
917 | } |
---|
918 | |
---|
919 | Statement * dtor = ctorInit->dtor; |
---|
920 | if ( dtor ) { |
---|
921 | ImplicitCtorDtorStmt * implicit = strict_dynamic_cast< ImplicitCtorDtorStmt * >( dtor ); |
---|
922 | Statement * dtorStmt = implicit->callStmt; |
---|
923 | |
---|
924 | // don't need to call intrinsic dtor, because it does nothing, but |
---|
925 | // non-intrinsic dtors must be called |
---|
926 | if ( ! isIntrinsicSingleArgCallStmt( dtorStmt ) ) { |
---|
927 | // set dtor location to the object's location for error messages |
---|
928 | DeclarationWithType * dtorFunc = getDtorFunc( objDecl, dtorStmt, stmtsToAddBefore ); |
---|
929 | objDecl->attributes.push_back( new Attribute( "cleanup", { new VariableExpr( dtorFunc ) } ) ); |
---|
930 | ctorInit->dtor = nullptr; |
---|
931 | } // if |
---|
932 | } |
---|
933 | } // if |
---|
934 | } else if ( Initializer * init = ctorInit->init ) { |
---|
935 | objDecl->init = init; |
---|
936 | ctorInit->init = nullptr; |
---|
937 | } else { |
---|
938 | // no constructor and no initializer, which is okay |
---|
939 | objDecl->init = nullptr; |
---|
940 | } // if |
---|
941 | delete ctorInit; |
---|
942 | } // if |
---|
943 | return objDecl; |
---|
944 | } |
---|
945 | |
---|
946 | void ObjDeclCollector::previsit( CompoundStmt * ) { |
---|
947 | GuardValue( curVars ); |
---|
948 | } |
---|
949 | |
---|
950 | void ObjDeclCollector::previsit( DeclStmt * stmt ) { |
---|
951 | // keep track of all variables currently in scope |
---|
952 | if ( ObjectDecl * objDecl = dynamic_cast< ObjectDecl * > ( stmt->get_decl() ) ) { |
---|
953 | curVars.push_back( objDecl ); |
---|
954 | } // if |
---|
955 | } |
---|
956 | |
---|
957 | void LabelFinder::previsit( Statement * stmt ) { |
---|
958 | // for each label, remember the variables in scope at that label. |
---|
959 | for ( Label l : stmt->get_labels() ) { |
---|
960 | vars[l] = curVars; |
---|
961 | } // for |
---|
962 | } |
---|
963 | |
---|
964 | void LabelFinder::previsit( CompoundStmt * stmt ) { |
---|
965 | previsit( (Statement *)stmt ); |
---|
966 | Parent::previsit( stmt ); |
---|
967 | } |
---|
968 | |
---|
969 | void LabelFinder::previsit( DeclStmt * stmt ) { |
---|
970 | previsit( (Statement *)stmt ); |
---|
971 | Parent::previsit( stmt ); |
---|
972 | } |
---|
973 | |
---|
974 | |
---|
975 | void InsertDtors::previsit( FunctionDecl * funcDecl ) { |
---|
976 | // each function needs to have its own set of labels |
---|
977 | GuardValue( labelVars ); |
---|
978 | labelVars.clear(); |
---|
979 | // LabelFinder does not recurse into FunctionDecl, so need to visit |
---|
980 | // its children manually. |
---|
981 | maybeAccept( funcDecl->type, finder ); |
---|
982 | maybeAccept( funcDecl->statements, finder ); |
---|
983 | |
---|
984 | // all labels for this function have been collected, insert destructors as appropriate via implicit recursion. |
---|
985 | } |
---|
986 | |
---|
987 | // Handle break/continue/goto in the same manner as C++. Basic idea: any objects that are in scope at the |
---|
988 | // BranchStmt but not at the labelled (target) statement must be destructed. If there are any objects in scope |
---|
989 | // at the target location but not at the BranchStmt then those objects would be uninitialized so notify the user |
---|
990 | // of the error. See C++ Reference 6.6 Jump Statements for details. |
---|
991 | void InsertDtors::handleGoto( BranchStmt * stmt ) { |
---|
992 | // can't do anything for computed goto |
---|
993 | if ( stmt->computedTarget ) return; |
---|
994 | |
---|
995 | assertf( stmt->get_target() != "", "BranchStmt missing a label: %s", toString( stmt ).c_str() ); |
---|
996 | // S_L = lvars = set of objects in scope at label definition |
---|
997 | // S_G = curVars = set of objects in scope at goto statement |
---|
998 | ObjectSet & lvars = labelVars[ stmt->get_target() ]; |
---|
999 | |
---|
1000 | DTOR_PRINT( |
---|
1001 | std::cerr << "at goto label: " << stmt->get_target().get_name() << std::endl; |
---|
1002 | std::cerr << "S_G = " << printSet( curVars ) << std::endl; |
---|
1003 | std::cerr << "S_L = " << printSet( lvars ) << std::endl; |
---|
1004 | ) |
---|
1005 | |
---|
1006 | ObjectSet diff; |
---|
1007 | // S_L-S_G results in set of objects whose construction is skipped - it's an error if this set is non-empty |
---|
1008 | std::set_difference( lvars.begin(), lvars.end(), curVars.begin(), curVars.end(), std::inserter( diff, diff.begin() ) ); |
---|
1009 | DTOR_PRINT( |
---|
1010 | std::cerr << "S_L-S_G = " << printSet( diff ) << std::endl; |
---|
1011 | ) |
---|
1012 | if ( ! diff.empty() ) { |
---|
1013 | SemanticError( stmt, std::string("jump to label '") + stmt->get_target().get_name() + "' crosses initialization of " + (*diff.begin())->get_name() + " " ); |
---|
1014 | } // if |
---|
1015 | } |
---|
1016 | |
---|
1017 | void InsertDtors::previsit( BranchStmt * stmt ) { |
---|
1018 | switch( stmt->get_type() ) { |
---|
1019 | case BranchStmt::Continue: |
---|
1020 | case BranchStmt::Break: |
---|
1021 | // could optimize the break/continue case, because the S_L-S_G check is unnecessary (this set should |
---|
1022 | // always be empty), but it serves as a small sanity check. |
---|
1023 | case BranchStmt::Goto: |
---|
1024 | handleGoto( stmt ); |
---|
1025 | break; |
---|
1026 | default: |
---|
1027 | assert( false ); |
---|
1028 | } // switch |
---|
1029 | } |
---|
1030 | |
---|
1031 | bool checkWarnings( FunctionDecl * funcDecl ) { |
---|
1032 | // only check for warnings if the current function is a user-defined |
---|
1033 | // constructor or destructor |
---|
1034 | if ( ! funcDecl ) return false; |
---|
1035 | if ( ! funcDecl->get_statements() ) return false; |
---|
1036 | return CodeGen::isCtorDtor( funcDecl->get_name() ) && ! LinkageSpec::isOverridable( funcDecl->get_linkage() ); |
---|
1037 | } |
---|
1038 | |
---|
1039 | void GenStructMemberCalls::premutate( FunctionDecl * funcDecl ) { |
---|
1040 | GuardValue( function ); |
---|
1041 | GuardValue( unhandled ); |
---|
1042 | GuardValue( usedUninit ); |
---|
1043 | GuardValue( thisParam ); |
---|
1044 | GuardValue( isCtor ); |
---|
1045 | GuardValue( structDecl ); |
---|
1046 | errors = SemanticErrorException(); // clear previous errors |
---|
1047 | |
---|
1048 | // need to start with fresh sets |
---|
1049 | unhandled.clear(); |
---|
1050 | usedUninit.clear(); |
---|
1051 | |
---|
1052 | function = funcDecl; |
---|
1053 | isCtor = CodeGen::isConstructor( function->get_name() ); |
---|
1054 | if ( checkWarnings( function ) ) { |
---|
1055 | FunctionType * type = function->get_functionType(); |
---|
1056 | assert( ! type->get_parameters().empty() ); |
---|
1057 | thisParam = strict_dynamic_cast< ObjectDecl * >( type->get_parameters().front() ); |
---|
1058 | Type * thisType = getPointerBase( thisParam->get_type() ); |
---|
1059 | StructInstType * structType = dynamic_cast< StructInstType * >( thisType ); |
---|
1060 | if ( structType ) { |
---|
1061 | structDecl = structType->get_baseStruct(); |
---|
1062 | for ( Declaration * member : structDecl->get_members() ) { |
---|
1063 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
---|
1064 | // record all of the struct type's members that need to be constructed or |
---|
1065 | // destructed by the end of the function |
---|
1066 | unhandled.insert( field ); |
---|
1067 | } |
---|
1068 | } |
---|
1069 | } |
---|
1070 | } |
---|
1071 | } |
---|
1072 | |
---|
1073 | DeclarationWithType * GenStructMemberCalls::postmutate( FunctionDecl * funcDecl ) { |
---|
1074 | // remove the unhandled objects from usedUninit, because a call is inserted |
---|
1075 | // to handle them - only objects that are later constructed are used uninitialized. |
---|
1076 | std::map< DeclarationWithType *, CodeLocation > diff; |
---|
1077 | // need the comparator since usedUninit and unhandled have different types |
---|
1078 | struct comp_t { |
---|
1079 | typedef decltype(usedUninit)::value_type usedUninit_t; |
---|
1080 | typedef decltype(unhandled)::value_type unhandled_t; |
---|
1081 | bool operator()(usedUninit_t x, unhandled_t y) { return x.first < y; } |
---|
1082 | bool operator()(unhandled_t x, usedUninit_t y) { return x < y.first; } |
---|
1083 | } comp; |
---|
1084 | std::set_difference( usedUninit.begin(), usedUninit.end(), unhandled.begin(), unhandled.end(), std::inserter( diff, diff.begin() ), comp ); |
---|
1085 | for ( auto p : diff ) { |
---|
1086 | DeclarationWithType * member = p.first; |
---|
1087 | CodeLocation loc = p.second; |
---|
1088 | // xxx - make error message better by also tracking the location that the object is constructed at? |
---|
1089 | emit( loc, "in ", CodeGen::genPrettyType( function->get_functionType(), function->get_name() ), ", field ", member->get_name(), " used before being constructed" ); |
---|
1090 | } |
---|
1091 | |
---|
1092 | if ( ! unhandled.empty() ) { |
---|
1093 | // need to explicitly re-add function parameters to the indexer in order to resolve copy constructors |
---|
1094 | auto guard = makeFuncGuard( [this]() { indexer.enterScope(); }, [this]() { indexer.leaveScope(); } ); |
---|
1095 | indexer.addFunctionType( function->type ); |
---|
1096 | |
---|
1097 | // need to iterate through members in reverse in order for |
---|
1098 | // ctor/dtor statements to come out in the right order |
---|
1099 | for ( Declaration * member : reverseIterate( structDecl->get_members() ) ) { |
---|
1100 | DeclarationWithType * field = dynamic_cast< DeclarationWithType * >( member ); |
---|
1101 | // skip non-DWT members |
---|
1102 | if ( ! field ) continue; |
---|
1103 | // skip non-constructable members |
---|
1104 | if ( ! tryConstruct( field ) ) continue; |
---|
1105 | // skip handled members |
---|
1106 | if ( ! unhandled.count( field ) ) continue; |
---|
1107 | |
---|
1108 | // insert and resolve default/copy constructor call for each field that's unhandled |
---|
1109 | std::list< Statement * > stmt; |
---|
1110 | Expression * arg2 = nullptr; |
---|
1111 | if ( isCopyConstructor( function ) ) { |
---|
1112 | // if copy ctor, need to pass second-param-of-this-function.field |
---|
1113 | std::list< DeclarationWithType * > & params = function->get_functionType()->get_parameters(); |
---|
1114 | assert( params.size() == 2 ); |
---|
1115 | arg2 = new MemberExpr( field, new VariableExpr( params.back() ) ); |
---|
1116 | } |
---|
1117 | InitExpander srcParam( arg2 ); |
---|
1118 | // cast away reference type and construct field. |
---|
1119 | Expression * thisExpr = new CastExpr( new VariableExpr( thisParam ), thisParam->get_type()->stripReferences()->clone() ); |
---|
1120 | Expression * memberDest = new MemberExpr( field, thisExpr ); |
---|
1121 | SymTab::genImplicitCall( srcParam, memberDest, function->get_name(), back_inserter( stmt ), field, isCtor ); |
---|
1122 | |
---|
1123 | assert( stmt.size() <= 1 ); |
---|
1124 | if ( stmt.size() == 1 ) { |
---|
1125 | Statement * callStmt = stmt.front(); |
---|
1126 | |
---|
1127 | try { |
---|
1128 | callStmt->acceptMutator( *visitor ); |
---|
1129 | if ( isCtor ) { |
---|
1130 | function->statements->push_front( callStmt ); |
---|
1131 | } else { // TODO: don't generate destructor function/object for intrinsic calls |
---|
1132 | // destructor statements should be added at the end |
---|
1133 | // function->get_statements()->push_back( callStmt ); |
---|
1134 | |
---|
1135 | // Optimization: do not need to call intrinsic destructors on members |
---|
1136 | if ( isIntrinsicSingleArgCallStmt( callStmt ) ) continue;; |
---|
1137 | |
---|
1138 | // __Destructor _dtor0 = { (void *)&b.a1, (void (*)(void *)_destroy_A }; |
---|
1139 | std::list< Statement * > stmtsToAdd; |
---|
1140 | |
---|
1141 | static UniqueName memberDtorNamer = { "__memberDtor" }; |
---|
1142 | assertf( Validate::dtorStruct, "builtin __Destructor not found." ); |
---|
1143 | assertf( Validate::dtorStructDestroy, "builtin __destroy_Destructor not found." ); |
---|
1144 | |
---|
1145 | Expression * thisExpr = new CastExpr( new AddressExpr( new VariableExpr( thisParam ) ), new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ) ); |
---|
1146 | Expression * dtorExpr = new VariableExpr( getDtorFunc( thisParam, callStmt, stmtsToAdd ) ); |
---|
1147 | |
---|
1148 | // cast destructor pointer to void (*)(void *), to silence GCC incompatible pointer warnings |
---|
1149 | FunctionType * dtorFtype = new FunctionType( Type::Qualifiers(), false ); |
---|
1150 | dtorFtype->parameters.push_back( ObjectDecl::newObject( "", new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), nullptr ) ); |
---|
1151 | Type * dtorType = new PointerType( Type::Qualifiers(), dtorFtype ); |
---|
1152 | |
---|
1153 | ObjectDecl * destructor = ObjectDecl::newObject( memberDtorNamer.newName(), new StructInstType( Type::Qualifiers(), Validate::dtorStruct ), new ListInit( { new SingleInit( thisExpr ), new SingleInit( new CastExpr( dtorExpr, dtorType ) ) } ) ); |
---|
1154 | function->statements->push_front( new DeclStmt( destructor ) ); |
---|
1155 | destructor->attributes.push_back( new Attribute( "cleanup", { new VariableExpr( Validate::dtorStructDestroy ) } ) ); |
---|
1156 | |
---|
1157 | function->statements->kids.splice( function->statements->kids.begin(), stmtsToAdd ); |
---|
1158 | } |
---|
1159 | } catch ( SemanticErrorException & error ) { |
---|
1160 | emit( funcDecl->location, "in ", CodeGen::genPrettyType( function->get_functionType(), function->get_name() ), ", field ", field->get_name(), " not explicitly ", isCtor ? "constructed" : "destructed", " and no ", isCtor ? "default constructor" : "destructor", " found" ); |
---|
1161 | } |
---|
1162 | } |
---|
1163 | } |
---|
1164 | } |
---|
1165 | if (! errors.isEmpty()) { |
---|
1166 | throw errors; |
---|
1167 | } |
---|
1168 | return funcDecl; |
---|
1169 | } |
---|
1170 | |
---|
1171 | /// true if expr is effectively just the 'this' parameter |
---|
1172 | bool isThisExpression( Expression * expr, DeclarationWithType * thisParam ) { |
---|
1173 | // TODO: there are more complicated ways to pass 'this' to a constructor, e.g. &*, *&, etc. |
---|
1174 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) { |
---|
1175 | return varExpr->get_var() == thisParam; |
---|
1176 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * > ( expr ) ) { |
---|
1177 | return isThisExpression( castExpr->get_arg(), thisParam ); |
---|
1178 | } |
---|
1179 | return false; |
---|
1180 | } |
---|
1181 | |
---|
1182 | /// returns a MemberExpr if expr is effectively just member access on the 'this' parameter, else nullptr |
---|
1183 | MemberExpr * isThisMemberExpr( Expression * expr, DeclarationWithType * thisParam ) { |
---|
1184 | if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) { |
---|
1185 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
1186 | return memberExpr; |
---|
1187 | } |
---|
1188 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) { |
---|
1189 | return isThisMemberExpr( castExpr->get_arg(), thisParam ); |
---|
1190 | } |
---|
1191 | return nullptr; |
---|
1192 | } |
---|
1193 | |
---|
1194 | void GenStructMemberCalls::premutate( ApplicationExpr * appExpr ) { |
---|
1195 | if ( ! checkWarnings( function ) ) { |
---|
1196 | visit_children = false; |
---|
1197 | return; |
---|
1198 | } |
---|
1199 | |
---|
1200 | std::string fname = getFunctionName( appExpr ); |
---|
1201 | if ( fname == function->name ) { |
---|
1202 | // call to same kind of function |
---|
1203 | Expression * firstParam = appExpr->args.front(); |
---|
1204 | |
---|
1205 | if ( isThisExpression( firstParam, thisParam ) ) { |
---|
1206 | // if calling another constructor on thisParam, assume that function handles |
---|
1207 | // all members - if it doesn't a warning will appear in that function. |
---|
1208 | unhandled.clear(); |
---|
1209 | } else if ( MemberExpr * memberExpr = isThisMemberExpr( firstParam, thisParam ) ) { |
---|
1210 | // if first parameter is a member expression on the this parameter, |
---|
1211 | // then remove the member from unhandled set. |
---|
1212 | if ( isThisExpression( memberExpr->aggregate, thisParam ) ) { |
---|
1213 | unhandled.erase( memberExpr->member ); |
---|
1214 | } |
---|
1215 | } |
---|
1216 | } |
---|
1217 | } |
---|
1218 | |
---|
1219 | void GenStructMemberCalls::premutate( MemberExpr * memberExpr ) { |
---|
1220 | if ( ! checkWarnings( function ) || ! isCtor ) { |
---|
1221 | visit_children = false; |
---|
1222 | return; |
---|
1223 | } |
---|
1224 | |
---|
1225 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
1226 | if ( unhandled.count( memberExpr->get_member() ) ) { |
---|
1227 | // emit a warning because a member was used before it was constructed |
---|
1228 | usedUninit.insert( { memberExpr->get_member(), memberExpr->location } ); |
---|
1229 | } |
---|
1230 | } |
---|
1231 | } |
---|
1232 | |
---|
1233 | template< typename Visitor, typename... Params > |
---|
1234 | void error( Visitor & v, CodeLocation loc, const Params &... params ) { |
---|
1235 | SemanticErrorException err( loc, toString( params... ) ); |
---|
1236 | v.errors.append( err ); |
---|
1237 | } |
---|
1238 | |
---|
1239 | template< typename... Params > |
---|
1240 | void GenStructMemberCalls::emit( CodeLocation loc, const Params &... params ) { |
---|
1241 | // toggle warnings vs. errors here. |
---|
1242 | // warn( params... ); |
---|
1243 | error( *this, loc, params... ); |
---|
1244 | } |
---|
1245 | |
---|
1246 | Expression * GenStructMemberCalls::postmutate( UntypedExpr * untypedExpr ) { |
---|
1247 | Expression * newExpr = untypedExpr; |
---|
1248 | ResolvExpr::findVoidExpression( newExpr, indexer ); |
---|
1249 | return newExpr; |
---|
1250 | } |
---|
1251 | |
---|
1252 | Expression * FixCtorExprs::postmutate( ConstructorExpr * ctorExpr ) { |
---|
1253 | static UniqueName tempNamer( "_tmp_ctor_expr" ); |
---|
1254 | // xxx - is the size check necessary? |
---|
1255 | assert( ctorExpr->result && ctorExpr->get_result()->size() == 1 ); |
---|
1256 | |
---|
1257 | // xxx - this can be TupleAssignExpr now. Need to properly handle this case. |
---|
1258 | ApplicationExpr * callExpr = strict_dynamic_cast< ApplicationExpr * > ( ctorExpr->get_callExpr() ); |
---|
1259 | TypeSubstitution * env = ctorExpr->get_env(); |
---|
1260 | ctorExpr->set_callExpr( nullptr ); |
---|
1261 | ctorExpr->set_env( nullptr ); |
---|
1262 | |
---|
1263 | // xxx - ideally we would reuse the temporary generated from the copy constructor passes from within firstArg if it exists and not generate a temporary if it's unnecessary. |
---|
1264 | ObjectDecl * tmp = ObjectDecl::newObject( tempNamer.newName(), callExpr->args.front()->result->clone(), nullptr ); |
---|
1265 | declsToAddBefore.push_back( tmp ); |
---|
1266 | delete ctorExpr; |
---|
1267 | |
---|
1268 | // build assignment and replace constructor's first argument with new temporary |
---|
1269 | Expression *& firstArg = callExpr->get_args().front(); |
---|
1270 | Expression * assign = new UntypedExpr( new NameExpr( "?=?" ), { new AddressExpr( new VariableExpr( tmp ) ), new AddressExpr( firstArg ) } ); |
---|
1271 | firstArg = new VariableExpr( tmp ); |
---|
1272 | |
---|
1273 | // resolve assignment and dispose of new env |
---|
1274 | ResolvExpr::findVoidExpression( assign, indexer ); |
---|
1275 | delete assign->env; |
---|
1276 | assign->env = nullptr; |
---|
1277 | |
---|
1278 | // for constructor expr: |
---|
1279 | // T x; |
---|
1280 | // x{}; |
---|
1281 | // results in: |
---|
1282 | // T x; |
---|
1283 | // T & tmp; |
---|
1284 | // &tmp = &x, ?{}(tmp), tmp |
---|
1285 | CommaExpr * commaExpr = new CommaExpr( assign, new CommaExpr( callExpr, new VariableExpr( tmp ) ) ); |
---|
1286 | commaExpr->set_env( env ); |
---|
1287 | return commaExpr; |
---|
1288 | } |
---|
1289 | } // namespace |
---|
1290 | } // namespace InitTweak |
---|
1291 | |
---|
1292 | // Local Variables: // |
---|
1293 | // tab-width: 4 // |
---|
1294 | // mode: c++ // |
---|
1295 | // compile-command: "make install" // |
---|
1296 | // End: // |
---|