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 | // FixGlobalInit.cc -- |
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8 | // |
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9 | // Author : Rob Schluntz |
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10 | // Created On : Mon May 04 15:14:56 2016 |
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11 | // Last Modified By : Rob Schluntz |
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12 | // Last Modified On : Fri May 06 13:51:00 2016 |
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13 | // Update Count : 2 |
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14 | // |
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15 | |
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16 | #include "FixGlobalInit.h" |
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17 | #include "SynTree/Declaration.h" |
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18 | #include "SynTree/Type.h" |
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19 | #include "SynTree/Expression.h" |
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20 | #include "SynTree/Statement.h" |
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21 | #include "SynTree/Initializer.h" |
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22 | #include "SynTree/Visitor.h" |
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23 | #include <algorithm> |
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24 | |
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25 | namespace InitTweak { |
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26 | namespace { |
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27 | const std::list<Label> noLabels; |
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28 | } |
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29 | |
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30 | class GlobalFixer : public Visitor { |
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31 | public: |
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32 | GlobalFixer(); |
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33 | |
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34 | virtual void visit( ObjectDecl *objDecl ); |
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35 | virtual void visit( FunctionDecl *functionDecl ); |
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36 | virtual void visit( StructDecl *aggregateDecl ); |
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37 | virtual void visit( UnionDecl *aggregateDecl ); |
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38 | virtual void visit( EnumDecl *aggregateDecl ); |
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39 | virtual void visit( TraitDecl *aggregateDecl ); |
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40 | virtual void visit( TypeDecl *typeDecl ); |
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41 | |
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42 | UniqueName tempNamer; |
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43 | CompoundStmt * block; |
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44 | }; |
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45 | |
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46 | class ConstExprChecker : public Visitor { |
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47 | public: |
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48 | ConstExprChecker() : isConstExpr( true ) {} |
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49 | |
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50 | virtual void visit( ApplicationExpr *applicationExpr ) { isConstExpr = false; } |
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51 | virtual void visit( UntypedExpr *untypedExpr ) { isConstExpr = false; } |
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52 | virtual void visit( NameExpr *nameExpr ) { isConstExpr = false; } |
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53 | virtual void visit( CastExpr *castExpr ) { isConstExpr = false; } |
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54 | virtual void visit( LabelAddressExpr *labAddressExpr ) { isConstExpr = false; } |
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55 | virtual void visit( UntypedMemberExpr *memberExpr ) { isConstExpr = false; } |
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56 | virtual void visit( MemberExpr *memberExpr ) { isConstExpr = false; } |
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57 | virtual void visit( VariableExpr *variableExpr ) { isConstExpr = false; } |
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58 | virtual void visit( ConstantExpr *constantExpr ) { /* bottom out */ } |
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59 | // these might be okay? |
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60 | // virtual void visit( SizeofExpr *sizeofExpr ); |
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61 | // virtual void visit( AlignofExpr *alignofExpr ); |
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62 | // virtual void visit( UntypedOffsetofExpr *offsetofExpr ); |
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63 | // virtual void visit( OffsetofExpr *offsetofExpr ); |
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64 | // virtual void visit( OffsetPackExpr *offsetPackExpr ); |
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65 | // virtual void visit( AttrExpr *attrExpr ); |
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66 | // virtual void visit( CommaExpr *commaExpr ); |
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67 | // virtual void visit( LogicalExpr *logicalExpr ); |
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68 | // virtual void visit( ConditionalExpr *conditionalExpr ); |
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69 | virtual void visit( TupleExpr *tupleExpr ) { isConstExpr = false; } |
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70 | virtual void visit( SolvedTupleExpr *tupleExpr ) { isConstExpr = false; } |
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71 | virtual void visit( TypeExpr *typeExpr ) { isConstExpr = false; } |
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72 | virtual void visit( AsmExpr *asmExpr ) { isConstExpr = false; } |
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73 | virtual void visit( UntypedValofExpr *valofExpr ) { isConstExpr = false; } |
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74 | virtual void visit( CompoundLiteralExpr *compLitExpr ) { isConstExpr = false; } |
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75 | |
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76 | bool isConstExpr; |
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77 | }; |
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78 | |
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79 | bool isConstExpr( Initializer * init ) { |
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80 | if ( init ) { |
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81 | ConstExprChecker checker; |
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82 | init->accept( checker ); |
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83 | return checker.isConstExpr; |
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84 | } |
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85 | // for all intents and purposes, no initializer means const expr |
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86 | return true; |
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87 | } |
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88 | |
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89 | void fixGlobalInit( std::list< Declaration * > & translationUnit, const std::string & name ) { |
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90 | GlobalFixer fixer; |
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91 | acceptAll( translationUnit, fixer ); |
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92 | // attribute only appears on the forward declaration, so need to make two function decls: |
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93 | // one with the body, one with the attribute. |
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94 | FunctionDecl * initFunction = new FunctionDecl( initName( name ), DeclarationNode::NoStorageClass, LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), 0, false, false ); |
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95 | FunctionDecl * forward = initFunction->clone(); |
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96 | forward->set_attribute( FunctionDecl::Constructor ); |
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97 | initFunction->set_statements( fixer.block ); |
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98 | translationUnit.push_back( forward ); |
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99 | translationUnit.push_back( initFunction ); |
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100 | } |
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101 | |
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102 | std::string initName( const std::string & name ) { |
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103 | // get basename |
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104 | std::string ret = name.substr( 0, name.find( '.' ) ); |
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105 | // replace invalid characters with _ |
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106 | static std::string invalid = "/-"; |
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107 | replace_if( ret.begin(), ret.end(), []( char c ) { return invalid.find(c) != std::string::npos; }, '_' ); |
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108 | return "_init_" + ret; |
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109 | } |
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110 | |
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111 | GlobalFixer::GlobalFixer() : tempNamer( "_global_init" ), block( new CompoundStmt( noLabels ) ) { |
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112 | } |
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113 | |
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114 | void GlobalFixer::visit( ObjectDecl *objDecl ) { |
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115 | std::list< Statement * > & statements = block->get_kids(); |
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116 | |
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117 | if ( objDecl->get_init() == NULL ) return; |
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118 | if ( objDecl->get_type()->get_isConst() ) return; // temporary: can't assign to a const variable |
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119 | // C allows you to initialize objects with constant expressions |
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120 | // xxx - this is an optimization. Need to first resolve constructors before we decide |
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121 | // to keep C-style initializer. |
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122 | // if ( isConstExpr( objDecl->get_init() ) ) return; |
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123 | |
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124 | // steal initializer from object and attach it to a new temporary |
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125 | ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, objDecl->get_type()->clone(), objDecl->get_init() ); |
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126 | objDecl->set_init( NULL ); |
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127 | statements.push_back( new DeclStmt( noLabels, newObj ) ); |
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128 | |
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129 | // assign (later: copy construct) objDecl using temporary |
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130 | UntypedExpr * init = new UntypedExpr( new NameExpr( "?=?" ) ); |
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131 | init->get_args().push_back( new AddressExpr( new VariableExpr( objDecl ) ) ); |
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132 | init->get_args().push_back( new VariableExpr( newObj ) ); |
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133 | statements.push_back( new ExprStmt( noLabels, init ) ); |
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134 | |
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135 | // xxx- need to destruct objDecl atexit |
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136 | } |
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137 | |
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138 | // only modify global variables |
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139 | void GlobalFixer::visit( FunctionDecl *functionDecl ) {} |
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140 | void GlobalFixer::visit( StructDecl *aggregateDecl ) {} |
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141 | void GlobalFixer::visit( UnionDecl *aggregateDecl ) {} |
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142 | void GlobalFixer::visit( EnumDecl *aggregateDecl ) {} |
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143 | void GlobalFixer::visit( TraitDecl *aggregateDecl ) {} |
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144 | void GlobalFixer::visit( TypeDecl *typeDecl ) {} |
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145 | |
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146 | } // namespace InitTweak |
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147 | |
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148 | // Local Variables: // |
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149 | // tab-width: 4 // |
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150 | // mode: c++ // |
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151 | // compile-command: "make install" // |
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152 | // End: // |
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153 | |
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