[51587aa] | 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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[a08ba92] | 7 | // RemoveInit.cc -- |
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[51587aa] | 8 | // |
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[cf16f94] | 9 | // Author : Rob Schluntz |
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[51587aa] | 10 | // Created On : Mon May 18 07:44:20 2015 |
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[7cd23d5] | 11 | // Last Modified By : Peter A. Buhr |
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[cf16f94] | 12 | // Last Modified On : Tue Dec 15 15:37:26 2015 |
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| 13 | // Update Count : 15 |
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[51587aa] | 14 | // |
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[a08ba92] | 15 | |
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[42e2ad7] | 16 | #include "RemoveInit.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/Mutator.h" |
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| 23 | |
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| 24 | namespace InitTweak { |
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[a08ba92] | 25 | namespace { |
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| 26 | const std::list<Label> noLabels; |
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| 27 | } |
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[cf16f94] | 28 | |
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| 29 | class RemoveInit : public Mutator { |
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| 30 | public: |
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| 31 | RemoveInit(); |
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| 32 | virtual ObjectDecl * mutate(ObjectDecl *objDecl); |
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| 33 | virtual DeclarationWithType * mutate( FunctionDecl *functionDecl ); |
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| 34 | |
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| 35 | virtual Statement * mutate( ReturnStmt * returnStmt ); |
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| 36 | |
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| 37 | virtual CompoundStmt * mutate(CompoundStmt * compoundStmt); |
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| 38 | |
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| 39 | protected: |
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| 40 | std::list< Statement* > stmtsToAddBefore; |
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| 41 | std::list< Statement* > stmtsToAddAfter; |
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| 42 | void mutateStatementList( std::list< Statement* > &statements ); |
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| 43 | |
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| 44 | std::list<DeclarationWithType*> returnVals; |
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| 45 | UniqueName tempNamer; |
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| 46 | std::string funcName; |
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| 47 | }; |
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[42e2ad7] | 48 | |
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[a08ba92] | 49 | void tweak( std::list< Declaration * > translationUnit ) { |
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| 50 | RemoveInit remover; |
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| 51 | mutateAll( translationUnit, remover ); |
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| 52 | } |
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[42e2ad7] | 53 | |
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[cf16f94] | 54 | RemoveInit::RemoveInit() : tempNamer( "_retVal" ) {} |
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| 55 | |
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[a08ba92] | 56 | void RemoveInit::mutateStatementList( std::list< Statement* > &statements ) { |
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| 57 | for ( std::list< Statement* >::iterator i = statements.begin(); i != statements.end(); ++i ) { |
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| 58 | if ( ! stmtsToAddAfter.empty() ) { |
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| 59 | statements.splice( i, stmtsToAddAfter ); |
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| 60 | } // if |
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| 61 | *i = (*i)->acceptMutator( *this ); |
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[cf16f94] | 62 | if ( ! stmtsToAddBefore.empty() ) { |
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| 63 | statements.splice( i, stmtsToAddBefore ); |
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| 64 | } // if |
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[a08ba92] | 65 | } // for |
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| 66 | if ( ! stmtsToAddAfter.empty() ) { |
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| 67 | statements.splice( statements.end(), stmtsToAddAfter ); |
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| 68 | } // if |
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| 69 | } |
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[42e2ad7] | 70 | |
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[a08ba92] | 71 | CompoundStmt *RemoveInit::mutate(CompoundStmt *compoundStmt) { |
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| 72 | mutateStatementList( compoundStmt->get_kids() ); |
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| 73 | return compoundStmt; |
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| 74 | } |
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[42e2ad7] | 75 | |
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[cf16f94] | 76 | // in the case where an object has an initializer and a polymorphic type, insert an assignment immediately after the |
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| 77 | // declaration. This will (seemingly) cause the later phases to do the right thing with the assignment |
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[a08ba92] | 78 | ObjectDecl *RemoveInit::mutate( ObjectDecl *objDecl ) { |
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| 79 | if (objDecl->get_init() && dynamic_cast<TypeInstType*>(objDecl->get_type())) { |
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| 80 | if (SingleInit * single = dynamic_cast<SingleInit*>(objDecl->get_init())) { |
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| 81 | UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) ); |
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| 82 | assign->get_args().push_back( new AddressExpr (new NameExpr( objDecl->get_name() ) ) ); |
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| 83 | assign->get_args().push_back( single->get_value()->clone() ); |
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| 84 | stmtsToAddAfter.push_back(new ExprStmt(noLabels, assign)); |
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| 85 | } // if |
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| 86 | } // if |
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| 87 | return objDecl; |
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| 88 | } |
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[cf16f94] | 89 | |
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| 90 | Statement *RemoveInit::mutate( ReturnStmt *returnStmt ) { |
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| 91 | // update for multiple return values |
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| 92 | assert( returnVals.size() == 0 || returnVals.size() == 1 ); |
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| 93 | // hands off if the function returns an lvalue - we don't want to allocate a temporary if a variable's address |
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| 94 | // is being returned |
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| 95 | if ( returnStmt->get_expr() && returnVals.size() == 1 && funcName != "?=?" && ! returnVals.front()->get_type()->get_isLvalue() ) { |
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| 96 | ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, returnVals.front()->get_type()->clone(), 0 ); |
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| 97 | stmtsToAddBefore.push_back( new DeclStmt( noLabels, newObj ) ); |
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| 98 | |
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| 99 | UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) ); |
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| 100 | assign->get_args().push_back( new AddressExpr (new NameExpr( newObj->get_name() ) ) ); |
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| 101 | assign->get_args().push_back( returnStmt->get_expr() ); |
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| 102 | stmtsToAddBefore.push_back(new ExprStmt(noLabels, assign)); |
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| 103 | |
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| 104 | returnStmt->set_expr( new VariableExpr( newObj ) ); |
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| 105 | } // if |
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| 106 | return returnStmt; |
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| 107 | } |
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| 108 | |
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| 109 | DeclarationWithType* RemoveInit::mutate( FunctionDecl *functionDecl ) { |
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| 110 | std::list<DeclarationWithType*> oldReturnVals = returnVals; |
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| 111 | std::string oldFuncName = funcName; |
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| 112 | |
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| 113 | FunctionType * type = functionDecl->get_functionType(); |
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| 114 | returnVals = type->get_returnVals(); |
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| 115 | funcName = functionDecl->get_name(); |
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| 116 | DeclarationWithType * decl = Mutator::mutate( functionDecl ); |
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| 117 | returnVals = oldReturnVals; |
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| 118 | funcName = oldFuncName; |
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| 119 | return decl; |
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| 120 | } |
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[42e2ad7] | 121 | } // namespace InitTweak |
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| 122 | |
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[51587aa] | 123 | // Local Variables: // |
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| 124 | // tab-width: 4 // |
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| 125 | // mode: c++ // |
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| 126 | // compile-command: "make install" // |
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| 127 | // End: // |
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