| 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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