| 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 | // ChooseMutator.cc -- |
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| 8 | // |
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| 9 | // Author : Rodolfo G. Esteves |
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| 10 | // Created On : Mon May 18 07:44:20 2015 |
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| 11 | // Last Modified By : Rob Schluntz |
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| 12 | // Last Modified On : Wed Jun 03 15:30:20 2015 |
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| 13 | // Update Count : 5 |
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| 14 | // |
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| 15 | |
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| 16 | #include <list> |
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| 17 | |
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| 18 | #include "SynTree/Statement.h" |
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| 19 | #include "ChooseMutator.h" |
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| 20 | |
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| 21 | namespace ControlStruct { |
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| 22 | Statement *ChooseMutator::mutate( ChooseStmt *chooseStmt ) { |
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| 23 | bool enclosingChoose = insideChoose; |
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| 24 | insideChoose = true; |
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| 25 | mutateAll( chooseStmt->get_branches(), *this ); |
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| 26 | insideChoose = enclosingChoose; |
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| 27 | return new SwitchStmt( chooseStmt->get_labels(), chooseStmt->get_condition(), chooseStmt->get_branches() ); |
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| 28 | } |
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| 29 | |
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| 30 | Statement *ChooseMutator::mutate( SwitchStmt *switchStmt ) { |
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| 31 | bool enclosingChoose = insideChoose; |
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| 32 | insideChoose = false; |
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| 33 | mutateAll( switchStmt->get_branches(), *this ); |
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| 34 | insideChoose = enclosingChoose; |
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| 35 | return switchStmt; |
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| 36 | } |
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| 37 | |
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| 38 | Statement *ChooseMutator::mutate( FallthruStmt *fallthruStmt ) { |
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| 39 | delete fallthruStmt; |
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| 40 | return new NullStmt(); |
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| 41 | } |
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| 42 | |
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| 43 | Statement* ChooseMutator::mutate( CaseStmt *caseStmt ) { |
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| 44 | std::list< Statement * > &stmts = caseStmt->get_statements(); |
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| 45 | |
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| 46 | // the difference between switch and choose is that switch has an implicit fallthrough |
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| 47 | // to the next case, whereas choose has an implicit break at the end of the current case. |
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| 48 | // thus to transform a choose statement into a switch, we only need to insert breaks at the |
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| 49 | // end of any case that doesn't already end in a break and that doesn't end in a fallthru |
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| 50 | |
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| 51 | if ( insideChoose ) { |
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| 52 | BranchStmt *posBrk; |
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| 53 | if ( (( posBrk = dynamic_cast< BranchStmt * > ( stmts.back() ) ) && |
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| 54 | ( posBrk->get_type() == BranchStmt::Break )) // last statement in the list is a (superfluous) 'break' |
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| 55 | || dynamic_cast< FallthruStmt * > ( stmts.back() ) ) |
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| 56 | ; |
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| 57 | else { |
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| 58 | stmts.push_back( new BranchStmt( std::list< Label >(), "", BranchStmt::Break ) ); |
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| 59 | } // if |
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| 60 | } // if |
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| 61 | |
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| 62 | mutateAll ( stmts, *this ); |
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| 63 | return caseStmt; |
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| 64 | } |
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| 65 | } // namespace ControlStruct |
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| 66 | |
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| 67 | // Local Variables: // |
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| 68 | // tab-width: 4 // |
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| 69 | // mode: c++ // |
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| 70 | // compile-command: "make install" // |
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| 71 | // End: // |
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