[711eee5] | 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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[4e24610] | 12 | // Last Modified On : Fri May 06 13:51:00 2016 |
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[711eee5] | 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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[4e24610] | 32 | GlobalFixer(); |
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[711eee5] | 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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[4e24610] | 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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[711eee5] | 41 | |
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| 42 | UniqueName tempNamer; |
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[4e24610] | 43 | CompoundStmt * block; |
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[711eee5] | 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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[4e24610] | 90 | GlobalFixer fixer; |
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[711eee5] | 91 | acceptAll( translationUnit, fixer ); |
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[4e24610] | 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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[711eee5] | 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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[4e24610] | 111 | GlobalFixer::GlobalFixer() : tempNamer( "_global_init" ), block( new CompoundStmt( noLabels ) ) { |
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[711eee5] | 112 | } |
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| 113 | |
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| 114 | void GlobalFixer::visit( ObjectDecl *objDecl ) { |
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[4e24610] | 115 | std::list< Statement * > & statements = block->get_kids(); |
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[711eee5] | 116 | |
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[4e24610] | 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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[711eee5] | 119 | // C allows you to initialize objects with constant expressions |
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[4e24610] | 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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[711eee5] | 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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[4e24610] | 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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[711eee5] | 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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