[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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[b617e4b] | 12 | // Last Modified On : Thu Apr 14 17:29:21 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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| 18 | #include "RemoveInit.h" |
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[db4ecc5] | 19 | #include "ResolvExpr/Resolver.h" |
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[71f4e4f] | 20 | #include "SynTree/Declaration.h" |
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| 21 | #include "SynTree/Type.h" |
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| 22 | #include "SynTree/Expression.h" |
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| 23 | #include "SynTree/Statement.h" |
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| 24 | #include "SynTree/Initializer.h" |
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| 25 | #include "SynTree/Mutator.h" |
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[db4ecc5] | 26 | #include "SymTab/Indexer.h" |
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[71f4e4f] | 27 | #include "GenPoly/PolyMutator.h" |
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| 28 | |
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| 29 | namespace InitTweak { |
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| 30 | namespace { |
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| 31 | const std::list<Label> noLabels; |
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[e0323a2] | 32 | const std::list<Expression*> noDesignators; |
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[71f4e4f] | 33 | } |
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| 34 | |
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[db4ecc5] | 35 | class InsertImplicitCalls : public Mutator { |
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| 36 | public: |
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| 37 | /// wrap function application expressions as ImplicitCopyCtorExpr nodes |
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| 38 | /// so that it is easy to identify which function calls need their parameters |
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| 39 | /// to be copy constructed |
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| 40 | static void insert( std::list< Declaration * > & translationUnit ); |
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| 41 | |
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| 42 | virtual Expression * mutate( ApplicationExpr * appExpr ); |
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| 43 | }; |
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| 44 | |
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| 45 | class ResolveCopyCtors : public SymTab::Indexer { |
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| 46 | public: |
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| 47 | /// generate temporary ObjectDecls for each argument and return value of each |
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| 48 | /// ImplicitCopyCtorExpr, generate/resolve copy construction expressions for each, |
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| 49 | /// and generate/resolve destructors for both arguments and return value temporaries |
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| 50 | static void resolveImplicitCalls( std::list< Declaration * > & translationUnit ); |
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| 51 | |
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| 52 | virtual void visit( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 53 | |
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| 54 | /// create and resolve ctor/dtor expression: fname(var, [cpArg]) |
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| 55 | ApplicationExpr * makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg = NULL ); |
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| 56 | }; |
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| 57 | |
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[71f4e4f] | 58 | class FixInit : public GenPoly::PolyMutator { |
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| 59 | public: |
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[db4ecc5] | 60 | /// expand each object declaration to use its constructor after it is declared. |
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| 61 | /// insert destructor calls at the appropriate places |
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[71f4e4f] | 62 | static void fixInitializers( std::list< Declaration * > &translationUnit ); |
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| 63 | |
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[db4ecc5] | 64 | virtual DeclarationWithType * mutate( ObjectDecl *objDecl ); |
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[f1e012b] | 65 | |
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| 66 | virtual CompoundStmt * mutate( CompoundStmt * compoundStmt ); |
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[39786813] | 67 | virtual Statement * mutate( ReturnStmt * returnStmt ); |
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| 68 | virtual Statement * mutate( BranchStmt * branchStmt ); |
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[5b2f5bb] | 69 | |
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| 70 | private: |
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[39786813] | 71 | // stack of list of statements - used to differentiate scopes |
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| 72 | std::list< std::list< Statement * > > dtorStmts; |
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[71f4e4f] | 73 | }; |
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| 74 | |
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[db4ecc5] | 75 | class FixCopyCtors : public GenPoly::PolyMutator { |
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| 76 | public: |
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| 77 | /// expand ImplicitCopyCtorExpr nodes into the temporary declarations, copy constructors, |
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| 78 | /// call expression, and destructors |
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| 79 | static void fixCopyCtors( std::list< Declaration * > &translationUnit ); |
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| 80 | |
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| 81 | virtual Expression * mutate( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 82 | |
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| 83 | private: |
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| 84 | // stack of list of statements - used to differentiate scopes |
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| 85 | std::list< std::list< Statement * > > dtorStmts; |
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| 86 | }; |
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| 87 | |
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[71f4e4f] | 88 | void fix( std::list< Declaration * > & translationUnit ) { |
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[db4ecc5] | 89 | InsertImplicitCalls::insert( translationUnit ); |
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| 90 | ResolveCopyCtors::resolveImplicitCalls( translationUnit ); |
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[71f4e4f] | 91 | FixInit::fixInitializers( translationUnit ); |
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[db4ecc5] | 92 | // FixCopyCtors must happen after FixInit, so that destructors are placed correctly |
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| 93 | FixCopyCtors::fixCopyCtors( translationUnit ); |
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| 94 | } |
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| 95 | |
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| 96 | void InsertImplicitCalls::insert( std::list< Declaration * > & translationUnit ) { |
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| 97 | InsertImplicitCalls inserter; |
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| 98 | mutateAll( translationUnit, inserter ); |
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| 99 | } |
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| 100 | |
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| 101 | void ResolveCopyCtors::resolveImplicitCalls( std::list< Declaration * > & translationUnit ) { |
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| 102 | ResolveCopyCtors resolver; |
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| 103 | acceptAll( translationUnit, resolver ); |
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[71f4e4f] | 104 | } |
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| 105 | |
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| 106 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
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| 107 | FixInit fixer; |
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| 108 | mutateAll( translationUnit, fixer ); |
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| 109 | } |
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| 110 | |
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[db4ecc5] | 111 | void FixCopyCtors::fixCopyCtors( std::list< Declaration * > & translationUnit ) { |
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| 112 | FixCopyCtors fixer; |
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| 113 | mutateAll( translationUnit, fixer ); |
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| 114 | } |
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| 115 | |
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| 116 | Expression * InsertImplicitCalls::mutate( ApplicationExpr * appExpr ) { |
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| 117 | if ( VariableExpr * function = dynamic_cast< VariableExpr * > ( appExpr->get_function() ) ) { |
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| 118 | if ( function->get_var()->get_linkage() == LinkageSpec::Intrinsic ) { |
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| 119 | // optimization: don't need to copy construct in order to call intrinsic functions |
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| 120 | return appExpr; |
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| 121 | } else if ( FunctionDecl * func = dynamic_cast< FunctionDecl * > ( function->get_var() ) ) { |
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| 122 | // if ( ) |
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| 123 | // // optimization: don't need to copy construct in order to call a copy constructor |
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| 124 | // return appExpr; |
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| 125 | } |
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| 126 | } |
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| 127 | // wrap each function call so that it is easy to identify nodes that have to be copy constructed |
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| 128 | appExpr = dynamic_cast< ApplicationExpr * >( Mutator::mutate( appExpr ) ); |
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| 129 | assert( appExpr ); |
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| 130 | return new ImplicitCopyCtorExpr( appExpr ); |
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| 131 | } |
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| 132 | |
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| 133 | ApplicationExpr * ResolveCopyCtors::makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg ) { |
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| 134 | assert( var ); |
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| 135 | UntypedExpr * untyped = new UntypedExpr( new NameExpr( fname ) ); |
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| 136 | untyped->get_args().push_back( new AddressExpr( new VariableExpr( var ) ) ); |
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| 137 | if (cpArg) untyped->get_args().push_back( cpArg ); |
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| 138 | |
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| 139 | // resolve copy constructor |
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| 140 | // should only be one alternative for copy ctor and dtor expressions, since |
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| 141 | // all arguments are fixed (VariableExpr and already resolved expression) |
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| 142 | ApplicationExpr * resolved = dynamic_cast< ApplicationExpr * >( ResolvExpr::findVoidExpression( untyped, *this ) ); |
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| 143 | |
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| 144 | assert( resolved ); |
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| 145 | delete untyped; |
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| 146 | return resolved; |
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| 147 | } |
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| 148 | |
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| 149 | void ResolveCopyCtors::visit( ImplicitCopyCtorExpr *impCpCtorExpr ) { |
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| 150 | static UniqueName tempNamer("_tmp_cp"); |
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| 151 | static UniqueName retNamer("_tmp_cp_ret"); |
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| 152 | |
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| 153 | // resolve function call |
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[b617e4b] | 154 | ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( ResolvExpr::findVoidExpression( impCpCtorExpr->get_callExpr(), *this ) ); |
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[db4ecc5] | 155 | assert( appExpr ); |
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[b617e4b] | 156 | delete impCpCtorExpr->get_callExpr(); |
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[db4ecc5] | 157 | impCpCtorExpr->set_callExpr( appExpr ); |
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| 158 | |
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[b617e4b] | 159 | // Visitor::visit( impCpCtorExpr ); |
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| 160 | |
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[db4ecc5] | 161 | // take each argument and attempt to copy construct it. |
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| 162 | for ( Expression * & arg : appExpr->get_args() ) { |
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| 163 | // xxx - need to handle tuple arguments |
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| 164 | assert( ! arg->get_results().empty() ); |
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| 165 | ObjectDecl * tmp = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, arg->get_results().front()->clone(), 0 ); |
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[b617e4b] | 166 | tmp->get_type()->set_isConst( false ); |
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[db4ecc5] | 167 | |
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| 168 | // create and resolve copy constructor |
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| 169 | ApplicationExpr * cpCtor = makeCtorDtor( "?{}", tmp, arg ); |
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| 170 | |
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| 171 | // if the chosen constructor is intrinsic, the copy is unnecessary, so |
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| 172 | // don't create the temporary and don't call the copy constructor |
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| 173 | VariableExpr * function = dynamic_cast< VariableExpr * >( cpCtor->get_function() ); |
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| 174 | assert( function ); |
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| 175 | if ( function->get_var()->get_linkage() != LinkageSpec::Intrinsic ) { |
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| 176 | // replace argument to function call with temporary |
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| 177 | arg = new VariableExpr( tmp ); |
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| 178 | impCpCtorExpr->get_tempDecls().push_back( tmp ); |
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| 179 | impCpCtorExpr->get_copyCtors().push_back( cpCtor ); |
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| 180 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", tmp ) ); |
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| 181 | } |
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| 182 | } |
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| 183 | |
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| 184 | // each return value from the call needs to be connected with an ObjectDecl |
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| 185 | // at the call site, which is initialized with the return value and is destructed |
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| 186 | // later |
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| 187 | // xxx - handle multiple return values |
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| 188 | for ( Type * result : appExpr->get_results() ) { |
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| 189 | ObjectDecl * ret = new ObjectDecl( retNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, result->clone(), new SingleInit( impCpCtorExpr->get_callExpr() ) ); |
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[b617e4b] | 190 | ret->get_type()->set_isConst( false ); |
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[db4ecc5] | 191 | impCpCtorExpr->get_returnDecls().push_back( ret ); |
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| 192 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
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| 193 | } |
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| 194 | } |
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| 195 | |
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| 196 | |
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| 197 | Expression * FixCopyCtors::mutate( ImplicitCopyCtorExpr * impCpCtorExpr ) { |
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| 198 | impCpCtorExpr = dynamic_cast< ImplicitCopyCtorExpr * >( Mutator::mutate( impCpCtorExpr ) ); |
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| 199 | assert( impCpCtorExpr ); |
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| 200 | |
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| 201 | std::list< Expression * > & copyCtors = impCpCtorExpr->get_copyCtors(); |
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| 202 | std::list< ObjectDecl * > & tempDecls = impCpCtorExpr->get_tempDecls(); |
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| 203 | std::list< ObjectDecl * > & returnDecls = impCpCtorExpr->get_returnDecls(); |
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| 204 | std::list< Expression * > & dtors = impCpCtorExpr->get_dtors(); |
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| 205 | |
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| 206 | // add all temporary declarations and their constructors |
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| 207 | for ( ObjectDecl * obj : tempDecls ) { |
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| 208 | assert( ! copyCtors.empty() ); |
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| 209 | stmtsToAdd.push_back( new DeclStmt( noLabels, obj ) ); |
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| 210 | stmtsToAdd.push_back( new ExprStmt( noLabels, copyCtors.front() ) ); |
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| 211 | copyCtors.pop_front(); |
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| 212 | } |
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| 213 | |
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| 214 | // add destructors after current statement |
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| 215 | for ( Expression * dtor : dtors ) { |
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| 216 | stmtsToAddAfter.push_back( new ExprStmt( noLabels, dtor ) ); |
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| 217 | } |
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| 218 | |
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| 219 | // xxx - update to work with multiple return values |
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| 220 | ObjectDecl * returnDecl = returnDecls.empty() ? NULL : returnDecls.front(); |
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| 221 | |
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| 222 | // xxx - some of these aren't necessary, and can be removed once this is stable |
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| 223 | copyCtors.clear(); |
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| 224 | dtors.clear(); |
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| 225 | tempDecls.clear(); |
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| 226 | returnDecls.clear(); |
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| 227 | |
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| 228 | if ( returnDecl ) { |
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| 229 | // call is currently attached to first returnDecl |
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| 230 | stmtsToAdd.push_back( new DeclStmt( noLabels, returnDecl ) ); |
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| 231 | return new VariableExpr( returnDecl ); |
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| 232 | } else { |
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| 233 | // add call expression - if no return values, can call directly |
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| 234 | return impCpCtorExpr->get_callExpr(); |
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| 235 | } |
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| 236 | } |
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| 237 | |
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| 238 | DeclarationWithType *FixInit::mutate( ObjectDecl *objDecl ) { |
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| 239 | // first recursively handle pieces of ObjectDecl so that they aren't missed by other visitors |
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| 240 | // when the init is removed from the ObjectDecl |
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| 241 | objDecl = dynamic_cast< ObjectDecl * >( Mutator::mutate( objDecl ) ); |
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| 242 | |
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[71f4e4f] | 243 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
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[f1e012b] | 244 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
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[71f4e4f] | 245 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
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[5b2f5bb] | 246 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
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[e0323a2] | 247 | if ( objDecl->get_storageClass() == DeclarationNode::Static ) { |
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| 248 | // generate: |
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| 249 | // static bool __objName_uninitialized = true; |
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| 250 | // if (__objName_uninitialized) { |
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| 251 | // __ctor(__objName); |
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| 252 | // void dtor_atexit() { |
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| 253 | // __dtor(__objName); |
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| 254 | // } |
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| 255 | // on_exit(dtorOnExit, &__objName); |
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| 256 | // __objName_uninitialized = false; |
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| 257 | // } |
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| 258 | |
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| 259 | // generate first line |
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| 260 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
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| 261 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant( boolType->clone(), "1" ) ), noDesignators ); |
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| 262 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", DeclarationNode::Static, LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
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| 263 | isUninitializedVar->fixUniqueId(); |
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| 264 | |
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| 265 | // void dtor_atexit(...) {...} |
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| 266 | 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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| 267 | dtorCaller->fixUniqueId(); |
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| 268 | dtorCaller->get_statements()->get_kids().push_back( ctorInit->get_dtor() ); |
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| 269 | |
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| 270 | // on_exit(dtor_atexit); |
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| 271 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
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| 272 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
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| 273 | |
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| 274 | // __objName_uninitialized = false; |
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| 275 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
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| 276 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
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| 277 | setTrue->get_args().push_back( new ConstantExpr( Constant( boolType->clone(), "0" ) ) ); |
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| 278 | |
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| 279 | // generate body of if |
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| 280 | CompoundStmt * initStmts = new CompoundStmt( noLabels ); |
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| 281 | std::list< Statement * > & body = initStmts->get_kids(); |
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| 282 | body.push_back( ctor ); |
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| 283 | body.push_back( new DeclStmt( noLabels, dtorCaller ) ); |
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| 284 | body.push_back( new ExprStmt( noLabels, callAtexit ) ); |
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| 285 | body.push_back( new ExprStmt( noLabels, setTrue ) ); |
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| 286 | |
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| 287 | // put it all together |
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| 288 | IfStmt * ifStmt = new IfStmt( noLabels, new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
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| 289 | stmtsToAddAfter.push_back( new DeclStmt( noLabels, isUninitializedVar ) ); |
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| 290 | stmtsToAddAfter.push_back( ifStmt ); |
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| 291 | } else { |
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| 292 | stmtsToAddAfter.push_back( ctor ); |
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[39786813] | 293 | dtorStmts.back().push_front( ctorInit->get_dtor() ); |
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[e0323a2] | 294 | } |
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[71f4e4f] | 295 | objDecl->set_init( NULL ); |
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| 296 | ctorInit->set_ctor( NULL ); |
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[5b2f5bb] | 297 | ctorInit->set_dtor( NULL ); // xxx - only destruct when constructing? Probably not? |
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[71f4e4f] | 298 | } else if ( Initializer * init = ctorInit->get_init() ) { |
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| 299 | objDecl->set_init( init ); |
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| 300 | ctorInit->set_init( NULL ); |
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| 301 | } else { |
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[f1e012b] | 302 | // no constructor and no initializer, which is okay |
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| 303 | objDecl->set_init( NULL ); |
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[71f4e4f] | 304 | } |
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| 305 | delete ctorInit; |
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| 306 | } |
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| 307 | return objDecl; |
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| 308 | } |
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[f1e012b] | 309 | |
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[39786813] | 310 | template<typename Iterator, typename OutputIterator> |
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| 311 | void insertDtors( Iterator begin, Iterator end, OutputIterator out ) { |
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| 312 | for ( Iterator it = begin ; it != end ; ++it ) { |
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[f1e012b] | 313 | // remove if instrinsic destructor statement |
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| 314 | // xxx - test user manually calling intrinsic functions - what happens? |
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| 315 | if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( *it ) ) { |
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[5b2f5bb] | 316 | ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( exprStmt->get_expr() ); |
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| 317 | assert( appExpr ); |
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| 318 | VariableExpr * function = dynamic_cast< VariableExpr * >( appExpr->get_function() ); |
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| 319 | assert( function ); |
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| 320 | // check for Intrinsic only - don't want to remove all overridable dtors because autogenerated dtor |
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| 321 | // will call all member dtors, and some members may have a user defined dtor. |
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| 322 | if ( function->get_var()->get_linkage() == LinkageSpec::Intrinsic ) { |
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[39786813] | 323 | // don't need to call intrinsic dtor, because it does nothing |
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[5b2f5bb] | 324 | } else { |
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| 325 | // non-intrinsic dtors must be called |
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[39786813] | 326 | *out++ = (*it)->clone(); |
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[f1e012b] | 327 | } |
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[5b2f5bb] | 328 | } else { |
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| 329 | // could also be a compound statement with a loop, in the case of an array |
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[39786813] | 330 | *out++ = (*it)->clone(); |
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[f1e012b] | 331 | } |
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| 332 | } |
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[39786813] | 333 | } |
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| 334 | |
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| 335 | |
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| 336 | CompoundStmt * FixInit::mutate( CompoundStmt * compoundStmt ) { |
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| 337 | // mutate statements - this will also populate dtorStmts list. |
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| 338 | // don't want to dump all destructors when block is left, |
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| 339 | // just the destructors associated with variables defined in this block, |
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| 340 | // so push a new list to the top of the stack so that we can differentiate scopes |
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| 341 | dtorStmts.push_back( std::list<Statement *>() ); |
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| 342 | |
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| 343 | compoundStmt = PolyMutator::mutate( compoundStmt ); |
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| 344 | std::list< Statement * > & statements = compoundStmt->get_kids(); |
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| 345 | |
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| 346 | insertDtors( dtorStmts.back().begin(), dtorStmts.back().end(), back_inserter( statements ) ); |
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| 347 | |
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| 348 | deleteAll( dtorStmts.back() ); |
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| 349 | dtorStmts.pop_back(); |
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| 350 | return compoundStmt; |
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| 351 | } |
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| 352 | |
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| 353 | Statement * FixInit::mutate( ReturnStmt * returnStmt ) { |
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| 354 | for ( std::list< std::list< Statement * > >::reverse_iterator list = dtorStmts.rbegin(); list != dtorStmts.rend(); ++list ) { |
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| 355 | insertDtors( list->begin(), list->end(), back_inserter( stmtsToAdd ) ); |
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| 356 | } |
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[db4ecc5] | 357 | return Mutator::mutate( returnStmt ); |
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[39786813] | 358 | } |
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| 359 | |
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| 360 | Statement * FixInit::mutate( BranchStmt * branchStmt ) { |
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[5b2f5bb] | 361 | // TODO: adding to the end of a block isn't sufficient, since |
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| 362 | // return/break/goto should trigger destructor when block is left. |
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[39786813] | 363 | switch( branchStmt->get_type() ) { |
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| 364 | case BranchStmt::Continue: |
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| 365 | case BranchStmt::Break: |
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| 366 | insertDtors( dtorStmts.back().begin(), dtorStmts.back().end(), back_inserter( stmtsToAdd ) ); |
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| 367 | break; |
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| 368 | case BranchStmt::Goto: |
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| 369 | // xxx |
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| 370 | // if goto leaves a block, generate dtors for every block it leaves |
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| 371 | // if goto is in same block but earlier statement, destruct every object that was defined after the statement |
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| 372 | break; |
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| 373 | default: |
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| 374 | assert( false ); |
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| 375 | } |
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[db4ecc5] | 376 | return Mutator::mutate( branchStmt ); |
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[f1e012b] | 377 | } |
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| 378 | |
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[39786813] | 379 | |
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[71f4e4f] | 380 | } // namespace InitTweak |
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| 381 | |
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| 382 | // Local Variables: // |
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| 383 | // tab-width: 4 // |
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| 384 | // mode: c++ // |
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| 385 | // compile-command: "make install" // |
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| 386 | // End: // |
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