| 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 | // CaseRangeMutator.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 : Peter A. Buhr
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| 12 | // Last Modified On : Tue Jul 12 17:35:13 2016
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| 13 | // Update Count : 9
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| 14 | //
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| 15 |
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| 16 | #include <list>
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| 17 | #include <cassert>
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| 18 | #include <cstdlib>
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| 19 | #include <iterator>
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| 20 |
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| 21 | #include "Common/utility.h"
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| 22 |
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| 23 | #include "SynTree/Statement.h"
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| 24 | #include "SynTree/Expression.h"
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| 25 | #include "SynTree/Constant.h"
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| 26 | #include "SynTree/Type.h"
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| 27 | #include "CaseRangeMutator.h"
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| 28 |
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| 29 | namespace ControlStruct {
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| 30 | Statement *CaseRangeMutator::mutate( SwitchStmt *switchStmt ) {
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| 31 | std::list< Statement * > &cases = switchStmt->get_branches();
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| 32 |
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| 33 | // a `for' would be more natural... all this contortions are because `replace' invalidates the iterator
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| 34 | std::list< Statement * >::iterator i = cases.begin();
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| 35 | while ( i != cases.end() ) {
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| 36 | (*i )->acceptMutator( *this );
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| 37 |
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| 38 | if ( ! newCaseLabels.empty() ) {
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| 39 | std::list< Statement * > newCases;
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| 40 |
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| 41 | // transform( newCaseLabels.begin(), newCaseLabels.end(), bnd1st( ptr_fun( ctor< CaseStmt, Label, Expression * > ) ) );
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| 42 |
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| 43 | for ( std::list< Expression * >::iterator j = newCaseLabels.begin();
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| 44 | j != newCaseLabels.end(); j++ ) {
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| 45 | std::list<Label> emptyLabels;
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| 46 | std::list< Statement *> emptyStmts;
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| 47 | newCases.push_back( new CaseStmt( emptyLabels, *j, emptyStmts ) );
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| 48 | } // for
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| 49 |
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| 50 | if ( CaseStmt *currentCase = dynamic_cast< CaseStmt * > ( *i ) )
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| 51 | if ( ! currentCase->get_statements().empty() ) {
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| 52 | CaseStmt *lastCase = dynamic_cast< CaseStmt * > ( newCases.back() );
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| 53 | if ( lastCase == 0 ) { throw ( 0 ); /* FIXME */ } // something is very wrong, as I just made these, and they were all cases
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| 54 | // transfer the statement block ( if any ) to the new list:
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| 55 | lastCase->set_statements( currentCase->get_statements() );
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| 56 | } // if
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| 57 | std::list< Statement * >::iterator j = i; advance( j, 1 );
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| 58 | replace ( cases, i, newCases );
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| 59 | i = j;
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| 60 | newCaseLabels.clear();
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| 61 | } else
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| 62 | i++;
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| 63 | } // while
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| 64 |
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| 65 | return switchStmt;
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| 66 | }
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| 67 |
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| 68 | Statement *CaseRangeMutator::mutate( CaseStmt *caseStmt ) {
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| 69 | UntypedExpr *cond;
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| 70 | if ( ( cond = dynamic_cast< UntypedExpr * >( caseStmt->get_condition() )) != 0 ) {
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| 71 | NameExpr *nmfunc;
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| 72 | if ( ( nmfunc = dynamic_cast< NameExpr *>( cond->get_function() )) != 0 ) {
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| 73 | if ( nmfunc->get_name() == std::string("Range") ) {
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| 74 | assert( cond->get_args().size() == 2 );
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| 75 | std::list<Expression *>::iterator i = cond->get_args().begin();
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| 76 | Expression *lo = *i, *hi = *(++i ); // "unnecessary" temporaries
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| 77 | fillRange( lo, hi );
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| 78 | } // if
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| 79 | } // if
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| 80 | } else if ( TupleExpr *tcond = dynamic_cast< TupleExpr * >( caseStmt->get_condition() ) ) {
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| 81 | // case list
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| 82 | assert( ! tcond->get_exprs().empty() );
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| 83 | for ( std::list< Expression * >::iterator i = tcond->get_exprs().begin(); i != tcond->get_exprs().end(); i++ )
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| 84 | newCaseLabels.push_back( *i ); // do I need to clone them?
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| 85 | } // if
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| 86 |
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| 87 | std::list< Statement * > &stmts = caseStmt->get_statements();
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| 88 | mutateAll ( stmts, *this );
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| 89 |
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| 90 | return caseStmt;
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| 91 | }
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| 92 |
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| 93 | void CaseRangeMutator::fillRange( Expression *lo, Expression *hi ) {
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| 94 | // generate the actual range ( and check for consistency )
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| 95 | Constant *c_lo, *c_hi;
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| 96 | ConstantExpr *ce_lo, *ce_hi;
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| 97 | ce_lo = dynamic_cast< ConstantExpr * >( lo );
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| 98 | ce_hi = dynamic_cast< ConstantExpr * >( hi );
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| 99 |
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| 100 | if ( ce_lo && ce_hi ) {
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| 101 | c_lo = ce_lo->get_constant(); c_hi = ce_hi->get_constant();
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| 102 | } /* else {
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| 103 | if ( ! ce_lo ) ;
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| 104 | if ( ! ce_hi ) ;
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| 105 | } */
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| 106 | BasicType *ty_lo = dynamic_cast< BasicType * >( c_lo->get_type() ),
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| 107 | *ty_hi = dynamic_cast< BasicType * >( c_hi->get_type() );
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| 108 |
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| 109 | if ( ! ty_lo || ! ty_hi )
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| 110 | return; // one of them is not a constant
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| 111 |
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| 112 | switch ( ty_lo->get_kind() ) {
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| 113 | case BasicType::Char:
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| 114 | case BasicType::UnsignedChar:
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| 115 | switch ( ty_hi->get_kind() ) {
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| 116 | case BasicType::Char:
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| 117 | case BasicType::UnsignedChar:
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| 118 | // first case, they are both printable ASCII characters represented as 'x'
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| 119 | if ( c_lo->get_value().size() == 3 && c_hi->get_value().size() == 3 ) {
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| 120 | char ch_lo = ( c_lo->get_value())[1], ch_hi = ( c_hi->get_value())[1];
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| 121 |
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| 122 | if ( ch_lo > ch_hi ) { char t=ch_lo; ch_lo=ch_hi; ch_hi=t; }
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| 123 |
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| 124 | for ( char c = ch_lo; c <= ch_hi; c++ ) {
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| 125 | Type::Qualifiers q;
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| 126 | Constant cnst( new BasicType( q, BasicType::Char ),
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| 127 | std::string("'") + c + std::string("'") );
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| 128 | newCaseLabels.push_back( new ConstantExpr( cnst ) );
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| 129 | } // for
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| 130 |
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| 131 | return;
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| 132 | } // if
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| 133 | break;
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| 134 | default:
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| 135 | // error: incompatible constants
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| 136 | break;
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| 137 | } // switch
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| 138 | break;
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| 139 | case BasicType::ShortSignedInt:
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| 140 | case BasicType::ShortUnsignedInt:
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| 141 | case BasicType::SignedInt:
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| 142 | case BasicType::UnsignedInt:
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| 143 | case BasicType::LongSignedInt:
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| 144 | case BasicType::LongUnsignedInt:
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| 145 | case BasicType::LongLongSignedInt:
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| 146 | case BasicType::LongLongUnsignedInt:
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| 147 | switch ( ty_hi->get_kind() ) {
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| 148 | case BasicType::ShortSignedInt:
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| 149 | case BasicType::ShortUnsignedInt:
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| 150 | case BasicType::SignedInt:
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| 151 | case BasicType::UnsignedInt:
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| 152 | case BasicType::LongSignedInt:
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| 153 | case BasicType::LongUnsignedInt:
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| 154 | case BasicType::LongLongSignedInt:
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| 155 | case BasicType::LongLongUnsignedInt: {
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| 156 | int i_lo = atoi( c_lo->get_value().c_str()),
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| 157 | i_hi = atoi( c_hi->get_value().c_str());
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| 158 |
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| 159 | if ( i_lo > i_hi ) { int t=i_lo; i_lo=i_hi; i_hi=t; }
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| 160 |
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| 161 | for ( int c = i_lo; c <= i_hi; c++ ) {
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| 162 | Type::Qualifiers q;
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| 163 | Constant cnst( new BasicType( q, ty_hi->get_kind()), // figure can't hurt (used to think in positives)
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| 164 | toString< int >( c ) );
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| 165 | newCaseLabels.push_back( new ConstantExpr( cnst ) );
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| 166 | }
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| 167 |
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| 168 | return;
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| 169 | }
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| 170 | default:
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| 171 | // error: incompatible constants
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| 172 | break;
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| 173 | }
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| 174 | break;
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| 175 | default:
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| 176 | break;
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| 177 | } // switch
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| 178 |
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| 179 | /* End: */{
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| 180 | // invalid range, signal a warning (it still generates the two case labels)
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| 181 | newCaseLabels.push_back( lo );
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| 182 | newCaseLabels.push_back( hi );
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| 183 | return;
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| 184 | }
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| 185 | }
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| 186 | } // namespace ControlStruct
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| 187 |
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| 188 | // Local Variables: //
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| 189 | // tab-width: 4 //
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| 190 | // mode: c++ //
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| 191 | // compile-command: "make install" //
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| 192 | // End: //
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