[71f4e4f] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // FixInit.h -- |
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| 8 | // |
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| 9 | // Author : Rob Schluntz |
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| 10 | // Created On : Wed Jan 13 16:29:30 2016 |
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| 11 | // Last Modified By : Rob Schluntz |
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[7b3f66b] | 12 | // Last Modified On : Fri May 13 11:44:26 2016 |
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[ca1c11f] | 13 | // Update Count : 30 |
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[71f4e4f] | 14 | // |
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| 15 | |
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| 16 | #include <stack> |
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| 17 | #include <list> |
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[a0fdbd5] | 18 | #include "FixInit.h" |
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[7b3f66b] | 19 | #include "InitTweak.h" |
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[db4ecc5] | 20 | #include "ResolvExpr/Resolver.h" |
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[845cedc] | 21 | #include "ResolvExpr/typeops.h" |
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[71f4e4f] | 22 | #include "SynTree/Declaration.h" |
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| 23 | #include "SynTree/Type.h" |
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| 24 | #include "SynTree/Expression.h" |
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| 25 | #include "SynTree/Statement.h" |
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| 26 | #include "SynTree/Initializer.h" |
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| 27 | #include "SynTree/Mutator.h" |
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[db4ecc5] | 28 | #include "SymTab/Indexer.h" |
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[71f4e4f] | 29 | #include "GenPoly/PolyMutator.h" |
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| 30 | |
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[845cedc] | 31 | bool ctordtorp = false; |
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| 32 | #define PRINT( text ) if ( ctordtorp ) { text } |
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| 33 | |
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[71f4e4f] | 34 | namespace InitTweak { |
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| 35 | namespace { |
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| 36 | const std::list<Label> noLabels; |
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[e0323a2] | 37 | const std::list<Expression*> noDesignators; |
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[71f4e4f] | 38 | } |
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| 39 | |
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[5382492] | 40 | class InsertImplicitCalls : public GenPoly::PolyMutator { |
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[db4ecc5] | 41 | public: |
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| 42 | /// wrap function application expressions as ImplicitCopyCtorExpr nodes |
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| 43 | /// so that it is easy to identify which function calls need their parameters |
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| 44 | /// to be copy constructed |
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| 45 | static void insert( std::list< Declaration * > & translationUnit ); |
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| 46 | |
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| 47 | virtual Expression * mutate( ApplicationExpr * appExpr ); |
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| 48 | }; |
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| 49 | |
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| 50 | class ResolveCopyCtors : public SymTab::Indexer { |
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| 51 | public: |
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| 52 | /// generate temporary ObjectDecls for each argument and return value of each |
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| 53 | /// ImplicitCopyCtorExpr, generate/resolve copy construction expressions for each, |
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| 54 | /// and generate/resolve destructors for both arguments and return value temporaries |
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| 55 | static void resolveImplicitCalls( std::list< Declaration * > & translationUnit ); |
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| 56 | |
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| 57 | virtual void visit( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 58 | |
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| 59 | /// create and resolve ctor/dtor expression: fname(var, [cpArg]) |
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| 60 | ApplicationExpr * makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg = NULL ); |
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[cf18eea] | 61 | /// true if type does not need to be copy constructed to ensure correctness |
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| 62 | bool skipCopyConstruct( Type * ); |
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[540de412] | 63 | private: |
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| 64 | TypeSubstitution * env; |
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[db4ecc5] | 65 | }; |
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| 66 | |
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[71f4e4f] | 67 | class FixInit : public GenPoly::PolyMutator { |
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| 68 | public: |
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[db4ecc5] | 69 | /// expand each object declaration to use its constructor after it is declared. |
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| 70 | /// insert destructor calls at the appropriate places |
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[71f4e4f] | 71 | static void fixInitializers( std::list< Declaration * > &translationUnit ); |
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| 72 | |
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[db4ecc5] | 73 | virtual DeclarationWithType * mutate( ObjectDecl *objDecl ); |
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[f1e012b] | 74 | |
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| 75 | virtual CompoundStmt * mutate( CompoundStmt * compoundStmt ); |
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[39786813] | 76 | virtual Statement * mutate( ReturnStmt * returnStmt ); |
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| 77 | virtual Statement * mutate( BranchStmt * branchStmt ); |
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[5b2f5bb] | 78 | |
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| 79 | private: |
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[39786813] | 80 | // stack of list of statements - used to differentiate scopes |
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| 81 | std::list< std::list< Statement * > > dtorStmts; |
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[71f4e4f] | 82 | }; |
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| 83 | |
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[db4ecc5] | 84 | class FixCopyCtors : public GenPoly::PolyMutator { |
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| 85 | public: |
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| 86 | /// expand ImplicitCopyCtorExpr nodes into the temporary declarations, copy constructors, |
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| 87 | /// call expression, and destructors |
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| 88 | static void fixCopyCtors( std::list< Declaration * > &translationUnit ); |
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| 89 | |
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| 90 | virtual Expression * mutate( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 91 | |
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| 92 | private: |
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| 93 | // stack of list of statements - used to differentiate scopes |
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| 94 | std::list< std::list< Statement * > > dtorStmts; |
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| 95 | }; |
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| 96 | |
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[71f4e4f] | 97 | void fix( std::list< Declaration * > & translationUnit ) { |
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[db4ecc5] | 98 | InsertImplicitCalls::insert( translationUnit ); |
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| 99 | ResolveCopyCtors::resolveImplicitCalls( translationUnit ); |
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[71f4e4f] | 100 | FixInit::fixInitializers( translationUnit ); |
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[db4ecc5] | 101 | // FixCopyCtors must happen after FixInit, so that destructors are placed correctly |
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| 102 | FixCopyCtors::fixCopyCtors( translationUnit ); |
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| 103 | } |
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| 104 | |
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| 105 | void InsertImplicitCalls::insert( std::list< Declaration * > & translationUnit ) { |
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| 106 | InsertImplicitCalls inserter; |
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| 107 | mutateAll( translationUnit, inserter ); |
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| 108 | } |
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| 109 | |
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| 110 | void ResolveCopyCtors::resolveImplicitCalls( std::list< Declaration * > & translationUnit ) { |
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| 111 | ResolveCopyCtors resolver; |
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| 112 | acceptAll( translationUnit, resolver ); |
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[71f4e4f] | 113 | } |
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| 114 | |
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| 115 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
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| 116 | FixInit fixer; |
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| 117 | mutateAll( translationUnit, fixer ); |
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| 118 | } |
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| 119 | |
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[db4ecc5] | 120 | void FixCopyCtors::fixCopyCtors( std::list< Declaration * > & translationUnit ) { |
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| 121 | FixCopyCtors fixer; |
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| 122 | mutateAll( translationUnit, fixer ); |
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| 123 | } |
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| 124 | |
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| 125 | Expression * InsertImplicitCalls::mutate( ApplicationExpr * appExpr ) { |
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[845cedc] | 126 | appExpr = dynamic_cast< ApplicationExpr * >( Mutator::mutate( appExpr ) ); |
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| 127 | assert( appExpr ); |
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| 128 | |
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[db4ecc5] | 129 | if ( VariableExpr * function = dynamic_cast< VariableExpr * > ( appExpr->get_function() ) ) { |
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| 130 | if ( function->get_var()->get_linkage() == LinkageSpec::Intrinsic ) { |
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| 131 | // optimization: don't need to copy construct in order to call intrinsic functions |
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| 132 | return appExpr; |
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[9554d9b] | 133 | } else if ( DeclarationWithType * funcDecl = dynamic_cast< DeclarationWithType * > ( function->get_var() ) ) { |
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| 134 | // FunctionType * ftype = funcDecl->get_functionType(); |
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| 135 | FunctionType * ftype = dynamic_cast< FunctionType * >( GenPoly::getFunctionType( funcDecl->get_type() ) ); |
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| 136 | assert( ftype ); |
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[845cedc] | 137 | if ( (funcDecl->get_name() == "?{}" || funcDecl->get_name() == "?=?") && ftype->get_parameters().size() == 2 ) { |
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| 138 | Type * t1 = ftype->get_parameters().front()->get_type(); |
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| 139 | Type * t2 = ftype->get_parameters().back()->get_type(); |
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| 140 | PointerType * ptrType = dynamic_cast< PointerType * > ( t1 ); |
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| 141 | assert( ptrType ); |
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[9554d9b] | 142 | |
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[845cedc] | 143 | if ( ResolvExpr::typesCompatible( ptrType->get_base(), t2, SymTab::Indexer() ) ) { |
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| 144 | // optimization: don't need to copy construct in order to call a copy constructor or |
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| 145 | // assignment operator |
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| 146 | return appExpr; |
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| 147 | } |
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| 148 | } else if ( funcDecl->get_name() == "^?{}" ) { |
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| 149 | // correctness: never copy construct arguments to a destructor |
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| 150 | return appExpr; |
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| 151 | } |
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[db4ecc5] | 152 | } |
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| 153 | } |
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[845cedc] | 154 | PRINT( std::cerr << "InsertImplicitCalls: adding a wrapper " << appExpr << std::endl; ) |
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| 155 | |
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[db4ecc5] | 156 | // wrap each function call so that it is easy to identify nodes that have to be copy constructed |
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[5382492] | 157 | ImplicitCopyCtorExpr * expr = new ImplicitCopyCtorExpr( appExpr ); |
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[540de412] | 158 | // save the type substitution onto the new node so that it is easy to find. |
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| 159 | // Ensure it is not deleted with the ImplicitCopyCtorExpr by removing it before deletion. |
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[5382492] | 160 | // The substitution is needed to obtain the type of temporary variables so that copy constructor |
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| 161 | // calls can be resolved. Normally this is what PolyMutator is for, but the pass that resolves |
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| 162 | // copy constructor calls must be an Indexer. We could alternatively make a PolyIndexer which |
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[540de412] | 163 | // saves the environment, or compute the types of temporaries here, but it's much simpler to |
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[5382492] | 164 | // save the environment here, and more cohesive to compute temporary variables and resolve copy |
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| 165 | // constructor calls together. |
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| 166 | assert( env ); |
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[540de412] | 167 | expr->set_env( env ); |
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[5382492] | 168 | return expr; |
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[db4ecc5] | 169 | } |
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| 170 | |
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[cf18eea] | 171 | bool ResolveCopyCtors::skipCopyConstruct( Type * type ) { |
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| 172 | return dynamic_cast< VarArgsType * >( type ) || GenPoly::getFunctionType( type ); |
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| 173 | } |
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| 174 | |
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[db4ecc5] | 175 | ApplicationExpr * ResolveCopyCtors::makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg ) { |
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| 176 | assert( var ); |
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| 177 | UntypedExpr * untyped = new UntypedExpr( new NameExpr( fname ) ); |
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| 178 | untyped->get_args().push_back( new AddressExpr( new VariableExpr( var ) ) ); |
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| 179 | if (cpArg) untyped->get_args().push_back( cpArg ); |
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| 180 | |
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| 181 | // resolve copy constructor |
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| 182 | // should only be one alternative for copy ctor and dtor expressions, since |
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| 183 | // all arguments are fixed (VariableExpr and already resolved expression) |
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[845cedc] | 184 | PRINT( std::cerr << "ResolvingCtorDtor " << untyped << std::endl; ) |
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[db4ecc5] | 185 | ApplicationExpr * resolved = dynamic_cast< ApplicationExpr * >( ResolvExpr::findVoidExpression( untyped, *this ) ); |
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[540de412] | 186 | if ( resolved->get_env() ) { |
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| 187 | env->add( *resolved->get_env() ); |
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| 188 | } |
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[db4ecc5] | 189 | |
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| 190 | assert( resolved ); |
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| 191 | delete untyped; |
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| 192 | return resolved; |
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| 193 | } |
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| 194 | |
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| 195 | void ResolveCopyCtors::visit( ImplicitCopyCtorExpr *impCpCtorExpr ) { |
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| 196 | static UniqueName tempNamer("_tmp_cp"); |
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| 197 | static UniqueName retNamer("_tmp_cp_ret"); |
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| 198 | |
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[845cedc] | 199 | PRINT( std::cerr << "ResolveCopyCtors: " << impCpCtorExpr << std::endl; ) |
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| 200 | Visitor::visit( impCpCtorExpr ); |
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[540de412] | 201 | env = impCpCtorExpr->get_env(); // xxx - maybe we really should just have a PolyIndexer... |
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[db4ecc5] | 202 | |
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[845cedc] | 203 | ApplicationExpr * appExpr = impCpCtorExpr->get_callExpr(); |
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[b617e4b] | 204 | |
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[db4ecc5] | 205 | // take each argument and attempt to copy construct it. |
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| 206 | for ( Expression * & arg : appExpr->get_args() ) { |
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[5382492] | 207 | PRINT( std::cerr << "Type Substitution: " << *impCpCtorExpr->get_env() << std::endl; ) |
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[db4ecc5] | 208 | // xxx - need to handle tuple arguments |
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| 209 | assert( ! arg->get_results().empty() ); |
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[cf18eea] | 210 | Type * result = arg->get_results().front(); |
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| 211 | if ( skipCopyConstruct( result ) ) continue; // skip certain non-copyable types |
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[5382492] | 212 | // type may involve type variables, so apply type substitution to get temporary variable's actual type |
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| 213 | result = result->clone(); |
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| 214 | impCpCtorExpr->get_env()->apply( result ); |
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| 215 | ObjectDecl * tmp = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, result, 0 ); |
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[b617e4b] | 216 | tmp->get_type()->set_isConst( false ); |
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[db4ecc5] | 217 | |
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| 218 | // create and resolve copy constructor |
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[845cedc] | 219 | PRINT( std::cerr << "makeCtorDtor for an argument" << std::endl; ) |
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[db4ecc5] | 220 | ApplicationExpr * cpCtor = makeCtorDtor( "?{}", tmp, arg ); |
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| 221 | |
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| 222 | // if the chosen constructor is intrinsic, the copy is unnecessary, so |
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| 223 | // don't create the temporary and don't call the copy constructor |
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| 224 | VariableExpr * function = dynamic_cast< VariableExpr * >( cpCtor->get_function() ); |
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| 225 | assert( function ); |
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| 226 | if ( function->get_var()->get_linkage() != LinkageSpec::Intrinsic ) { |
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| 227 | // replace argument to function call with temporary |
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[4ffdd63] | 228 | arg = new CommaExpr( cpCtor, new VariableExpr( tmp ) ); |
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[db4ecc5] | 229 | impCpCtorExpr->get_tempDecls().push_back( tmp ); |
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| 230 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", tmp ) ); |
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| 231 | } |
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| 232 | } |
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| 233 | |
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| 234 | // each return value from the call needs to be connected with an ObjectDecl |
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| 235 | // at the call site, which is initialized with the return value and is destructed |
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| 236 | // later |
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| 237 | // xxx - handle multiple return values |
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[845cedc] | 238 | ApplicationExpr * callExpr = impCpCtorExpr->get_callExpr(); |
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[1b31345] | 239 | // xxx - is this right? callExpr may not have the right environment, because it was attached |
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| 240 | // at a higher level. Trying to pass that environment along. |
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| 241 | callExpr->set_env( impCpCtorExpr->get_env()->clone() ); |
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[db4ecc5] | 242 | for ( Type * result : appExpr->get_results() ) { |
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[fea7ca7] | 243 | result = result->clone(); |
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| 244 | impCpCtorExpr->get_env()->apply( result ); |
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| 245 | ObjectDecl * ret = new ObjectDecl( retNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, result, 0 ); |
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[b617e4b] | 246 | ret->get_type()->set_isConst( false ); |
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[db4ecc5] | 247 | impCpCtorExpr->get_returnDecls().push_back( ret ); |
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[845cedc] | 248 | PRINT( std::cerr << "makeCtorDtor for a return" << std::endl; ) |
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[db4ecc5] | 249 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
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| 250 | } |
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[845cedc] | 251 | PRINT( std::cerr << "after Resolving: " << impCpCtorExpr << std::endl; ) |
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[db4ecc5] | 252 | } |
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| 253 | |
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| 254 | |
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| 255 | Expression * FixCopyCtors::mutate( ImplicitCopyCtorExpr * impCpCtorExpr ) { |
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[845cedc] | 256 | PRINT( std::cerr << "FixCopyCtors: " << impCpCtorExpr << std::endl; ) |
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| 257 | |
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[db4ecc5] | 258 | impCpCtorExpr = dynamic_cast< ImplicitCopyCtorExpr * >( Mutator::mutate( impCpCtorExpr ) ); |
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| 259 | assert( impCpCtorExpr ); |
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| 260 | |
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| 261 | std::list< ObjectDecl * > & tempDecls = impCpCtorExpr->get_tempDecls(); |
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| 262 | std::list< ObjectDecl * > & returnDecls = impCpCtorExpr->get_returnDecls(); |
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| 263 | std::list< Expression * > & dtors = impCpCtorExpr->get_dtors(); |
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| 264 | |
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| 265 | // add all temporary declarations and their constructors |
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| 266 | for ( ObjectDecl * obj : tempDecls ) { |
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| 267 | stmtsToAdd.push_back( new DeclStmt( noLabels, obj ) ); |
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[4ffdd63] | 268 | } |
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| 269 | for ( ObjectDecl * obj : returnDecls ) { |
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| 270 | stmtsToAdd.push_back( new DeclStmt( noLabels, obj ) ); |
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[db4ecc5] | 271 | } |
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| 272 | |
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| 273 | // add destructors after current statement |
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| 274 | for ( Expression * dtor : dtors ) { |
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| 275 | stmtsToAddAfter.push_back( new ExprStmt( noLabels, dtor ) ); |
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| 276 | } |
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| 277 | |
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| 278 | // xxx - update to work with multiple return values |
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| 279 | ObjectDecl * returnDecl = returnDecls.empty() ? NULL : returnDecls.front(); |
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[845cedc] | 280 | Expression * callExpr = impCpCtorExpr->get_callExpr(); |
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| 281 | |
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| 282 | PRINT( std::cerr << "Coming out the back..." << impCpCtorExpr << std::endl; ) |
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[db4ecc5] | 283 | |
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| 284 | // xxx - some of these aren't necessary, and can be removed once this is stable |
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| 285 | dtors.clear(); |
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| 286 | tempDecls.clear(); |
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| 287 | returnDecls.clear(); |
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[845cedc] | 288 | impCpCtorExpr->set_callExpr( NULL ); |
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[540de412] | 289 | impCpCtorExpr->set_env( NULL ); |
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[845cedc] | 290 | delete impCpCtorExpr; |
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[db4ecc5] | 291 | |
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| 292 | if ( returnDecl ) { |
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[4ffdd63] | 293 | UntypedExpr * assign = new UntypedExpr( new NameExpr( "?=?" ) ); |
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| 294 | assign->get_args().push_back( new VariableExpr( returnDecl ) ); |
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| 295 | assign->get_args().push_back( callExpr ); |
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| 296 | // know the result type of the assignment is the type of the LHS (minus the pointer), so |
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| 297 | // add that onto the assignment expression so that later steps have the necessary information |
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| 298 | assign->add_result( returnDecl->get_type()->clone() ); |
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[fea7ca7] | 299 | |
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| 300 | Expression * retExpr = new CommaExpr( assign, new VariableExpr( returnDecl ) ); |
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| 301 | if ( callExpr->get_results().front()->get_isLvalue() ) { |
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| 302 | // lvalue returning functions are funny. Lvalue.cc inserts a *? in front of any |
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| 303 | // lvalue returning non-intrinsic function. Add an AddressExpr to the call to negate |
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| 304 | // the derefence and change the type of the return temporary from T to T* to properly |
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| 305 | // capture the return value. Then dereference the result of the comma expression, since |
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| 306 | // the lvalue returning call was originally wrapped with an AddressExpr. |
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| 307 | // Effectively, this turns |
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| 308 | // lvalue T f(); |
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| 309 | // &*f() |
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| 310 | // into |
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| 311 | // T * tmp_cp_retN; |
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| 312 | // tmp_cp_ret_N = &*(tmp_cp_ret_N = &*f(), tmp_cp_ret); |
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| 313 | // which work out in terms of types, but is pretty messy. It would be nice to find a better way. |
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| 314 | assign->get_args().back() = new AddressExpr( assign->get_args().back() ); |
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| 315 | |
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| 316 | Type * resultType = returnDecl->get_type()->clone(); |
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| 317 | returnDecl->set_type( new PointerType( Type::Qualifiers(), returnDecl->get_type() ) ); |
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| 318 | UntypedExpr * deref = new UntypedExpr( new NameExpr( "*?" ) ); |
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| 319 | deref->get_args().push_back( retExpr ); |
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| 320 | deref->add_result( resultType ); |
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| 321 | retExpr = deref; |
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| 322 | } |
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[540de412] | 323 | // xxx - might need to set env on retExpr... |
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| 324 | // retExpr->set_env( env->clone() ); |
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[fea7ca7] | 325 | return retExpr; |
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[db4ecc5] | 326 | } else { |
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[845cedc] | 327 | return callExpr; |
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[db4ecc5] | 328 | } |
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| 329 | } |
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| 330 | |
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| 331 | DeclarationWithType *FixInit::mutate( ObjectDecl *objDecl ) { |
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| 332 | // first recursively handle pieces of ObjectDecl so that they aren't missed by other visitors |
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| 333 | // when the init is removed from the ObjectDecl |
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| 334 | objDecl = dynamic_cast< ObjectDecl * >( Mutator::mutate( objDecl ) ); |
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| 335 | |
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[71f4e4f] | 336 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
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[f1e012b] | 337 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
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[71f4e4f] | 338 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
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[5b2f5bb] | 339 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
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[e0323a2] | 340 | if ( objDecl->get_storageClass() == DeclarationNode::Static ) { |
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| 341 | // generate: |
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| 342 | // static bool __objName_uninitialized = true; |
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| 343 | // if (__objName_uninitialized) { |
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| 344 | // __ctor(__objName); |
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| 345 | // void dtor_atexit() { |
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| 346 | // __dtor(__objName); |
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| 347 | // } |
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| 348 | // on_exit(dtorOnExit, &__objName); |
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| 349 | // __objName_uninitialized = false; |
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| 350 | // } |
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| 351 | |
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| 352 | // generate first line |
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| 353 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
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| 354 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant( boolType->clone(), "1" ) ), noDesignators ); |
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| 355 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", DeclarationNode::Static, LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
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| 356 | isUninitializedVar->fixUniqueId(); |
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| 357 | |
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| 358 | // void dtor_atexit(...) {...} |
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| 359 | FunctionDecl * dtorCaller = new FunctionDecl( objDecl->get_mangleName() + "_dtor_atexit", DeclarationNode::NoStorageClass, LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), new CompoundStmt( noLabels ), false, false ); |
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| 360 | dtorCaller->fixUniqueId(); |
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| 361 | dtorCaller->get_statements()->get_kids().push_back( ctorInit->get_dtor() ); |
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| 362 | |
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| 363 | // on_exit(dtor_atexit); |
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| 364 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
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| 365 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
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| 366 | |
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| 367 | // __objName_uninitialized = false; |
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| 368 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
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| 369 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
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| 370 | setTrue->get_args().push_back( new ConstantExpr( Constant( boolType->clone(), "0" ) ) ); |
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| 371 | |
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| 372 | // generate body of if |
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| 373 | CompoundStmt * initStmts = new CompoundStmt( noLabels ); |
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| 374 | std::list< Statement * > & body = initStmts->get_kids(); |
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| 375 | body.push_back( ctor ); |
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| 376 | body.push_back( new DeclStmt( noLabels, dtorCaller ) ); |
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| 377 | body.push_back( new ExprStmt( noLabels, callAtexit ) ); |
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| 378 | body.push_back( new ExprStmt( noLabels, setTrue ) ); |
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| 379 | |
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| 380 | // put it all together |
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| 381 | IfStmt * ifStmt = new IfStmt( noLabels, new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
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| 382 | stmtsToAddAfter.push_back( new DeclStmt( noLabels, isUninitializedVar ) ); |
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| 383 | stmtsToAddAfter.push_back( ifStmt ); |
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| 384 | } else { |
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| 385 | stmtsToAddAfter.push_back( ctor ); |
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[39786813] | 386 | dtorStmts.back().push_front( ctorInit->get_dtor() ); |
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[e0323a2] | 387 | } |
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[71f4e4f] | 388 | objDecl->set_init( NULL ); |
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| 389 | ctorInit->set_ctor( NULL ); |
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[5b2f5bb] | 390 | ctorInit->set_dtor( NULL ); // xxx - only destruct when constructing? Probably not? |
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[71f4e4f] | 391 | } else if ( Initializer * init = ctorInit->get_init() ) { |
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| 392 | objDecl->set_init( init ); |
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| 393 | ctorInit->set_init( NULL ); |
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| 394 | } else { |
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[f1e012b] | 395 | // no constructor and no initializer, which is okay |
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| 396 | objDecl->set_init( NULL ); |
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[71f4e4f] | 397 | } |
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| 398 | delete ctorInit; |
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| 399 | } |
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| 400 | return objDecl; |
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| 401 | } |
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[f1e012b] | 402 | |
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[ec79847] | 403 | namespace { |
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| 404 | template<typename Iterator, typename OutputIterator> |
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| 405 | void insertDtors( Iterator begin, Iterator end, OutputIterator out ) { |
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| 406 | for ( Iterator it = begin ; it != end ; ++it ) { |
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| 407 | // remove if instrinsic destructor statement. Note that this is only called |
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| 408 | // on lists of implicit dtors, so if the user manually calls an intrinsic |
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[7b3f66b] | 409 | // dtor then the call must (and will) still be generated since the argument |
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| 410 | // may contain side effects. |
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[ec79847] | 411 | if ( ! isInstrinsicSingleArgCallStmt( *it ) ) { |
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| 412 | // don't need to call intrinsic dtor, because it does nothing, but |
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[5b2f5bb] | 413 | // non-intrinsic dtors must be called |
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[39786813] | 414 | *out++ = (*it)->clone(); |
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[f1e012b] | 415 | } |
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| 416 | } |
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| 417 | } |
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[39786813] | 418 | } |
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| 419 | |
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| 420 | CompoundStmt * FixInit::mutate( CompoundStmt * compoundStmt ) { |
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| 421 | // mutate statements - this will also populate dtorStmts list. |
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| 422 | // don't want to dump all destructors when block is left, |
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| 423 | // just the destructors associated with variables defined in this block, |
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| 424 | // so push a new list to the top of the stack so that we can differentiate scopes |
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| 425 | dtorStmts.push_back( std::list<Statement *>() ); |
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| 426 | |
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| 427 | compoundStmt = PolyMutator::mutate( compoundStmt ); |
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| 428 | std::list< Statement * > & statements = compoundStmt->get_kids(); |
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| 429 | |
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| 430 | insertDtors( dtorStmts.back().begin(), dtorStmts.back().end(), back_inserter( statements ) ); |
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| 431 | |
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| 432 | deleteAll( dtorStmts.back() ); |
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| 433 | dtorStmts.pop_back(); |
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| 434 | return compoundStmt; |
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| 435 | } |
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| 436 | |
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| 437 | Statement * FixInit::mutate( ReturnStmt * returnStmt ) { |
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| 438 | for ( std::list< std::list< Statement * > >::reverse_iterator list = dtorStmts.rbegin(); list != dtorStmts.rend(); ++list ) { |
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| 439 | insertDtors( list->begin(), list->end(), back_inserter( stmtsToAdd ) ); |
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| 440 | } |
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[db4ecc5] | 441 | return Mutator::mutate( returnStmt ); |
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[39786813] | 442 | } |
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| 443 | |
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| 444 | Statement * FixInit::mutate( BranchStmt * branchStmt ) { |
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[5b2f5bb] | 445 | // TODO: adding to the end of a block isn't sufficient, since |
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| 446 | // return/break/goto should trigger destructor when block is left. |
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[39786813] | 447 | switch( branchStmt->get_type() ) { |
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| 448 | case BranchStmt::Continue: |
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| 449 | case BranchStmt::Break: |
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| 450 | insertDtors( dtorStmts.back().begin(), dtorStmts.back().end(), back_inserter( stmtsToAdd ) ); |
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| 451 | break; |
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| 452 | case BranchStmt::Goto: |
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| 453 | // xxx |
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| 454 | // if goto leaves a block, generate dtors for every block it leaves |
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| 455 | // if goto is in same block but earlier statement, destruct every object that was defined after the statement |
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| 456 | break; |
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| 457 | default: |
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| 458 | assert( false ); |
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| 459 | } |
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[db4ecc5] | 460 | return Mutator::mutate( branchStmt ); |
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[f1e012b] | 461 | } |
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| 462 | |
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[39786813] | 463 | |
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[71f4e4f] | 464 | } // namespace InitTweak |
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| 465 | |
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| 466 | // Local Variables: // |
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| 467 | // tab-width: 4 // |
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| 468 | // mode: c++ // |
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| 469 | // compile-command: "make install" // |
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| 470 | // End: // |
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