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 May 19 13:00:28 2015 |
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13 | // Update Count : 3 |
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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 "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( ChooseStmt *chooseStmt ) { |
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31 | // There shouldn't be any `choose' statements by now, throw an exception or something. |
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32 | throw( 0 ) ; /* FIXME */ |
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33 | } |
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34 | |
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35 | Statement *CaseRangeMutator::mutate( SwitchStmt *switchStmt ) { |
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36 | std::list< Statement * > &cases = switchStmt->get_branches(); |
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37 | |
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38 | // a `for' would be more natural... all this contortions are because `replace' invalidates the iterator |
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39 | std::list< Statement * >::iterator i = cases.begin(); |
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40 | while ( i != cases.end() ) { |
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41 | (*i )->acceptMutator( *this ); |
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42 | |
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43 | if ( ! newCaseLabels.empty() ) { |
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44 | std::list< Statement * > newCases; |
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45 | |
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46 | // transform( newCaseLabels.begin(), newCaseLabels.end(), bnd1st( ptr_fun( ctor< CaseStmt, Label, Expression * > ) ) ); |
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47 | |
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48 | for ( std::list< Expression * >::iterator j = newCaseLabels.begin(); |
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49 | j != newCaseLabels.end(); j++ ) { |
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50 | std::list<Label> emptyLabels; |
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51 | std::list< Statement *> emptyStmts; |
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52 | newCases.push_back( new CaseStmt( emptyLabels, *j, emptyStmts ) ); |
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53 | } // for |
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54 | |
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55 | if ( CaseStmt *currentCase = dynamic_cast< CaseStmt * > ( *i ) ) |
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56 | if ( ! currentCase->get_statements().empty() ) { |
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57 | CaseStmt *lastCase = dynamic_cast< CaseStmt * > ( newCases.back() ); |
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58 | if ( lastCase == 0 ) { throw ( 0 ); /* FIXME */ } // something is very wrong, as I just made these, and they were all cases |
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59 | // transfer the statement block ( if any ) to the new list: |
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60 | lastCase->set_statements( currentCase->get_statements() ); |
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61 | } // if |
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62 | std::list< Statement * >::iterator j = i; advance( j, 1 ); |
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63 | replace ( cases, i, newCases ); |
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64 | i = j; |
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65 | newCaseLabels.clear(); |
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66 | } else |
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67 | i++; |
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68 | } // while |
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69 | |
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70 | return switchStmt; |
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71 | } |
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72 | |
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73 | Statement *CaseRangeMutator::mutate( FallthruStmt *fallthruStmt ) { |
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74 | //delete fallthruStmt; |
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75 | return new NullStmt(); |
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76 | } |
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77 | |
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78 | Statement *CaseRangeMutator::mutate( CaseStmt *caseStmt ) { |
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79 | UntypedExpr *cond; |
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80 | if ( ( cond = dynamic_cast< UntypedExpr * >( caseStmt->get_condition() )) != 0 ) { |
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81 | NameExpr *nmfunc; |
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82 | if ( ( nmfunc = dynamic_cast< NameExpr *>( cond->get_function() )) != 0 ) { |
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83 | if ( nmfunc->get_name() == std::string("Range") ) { |
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84 | assert( cond->get_args().size() == 2 ); |
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85 | std::list<Expression *>::iterator i = cond->get_args().begin(); |
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86 | Expression *lo = *i, *hi = *(++i ); // "unnecessary" temporaries |
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87 | fillRange( lo, hi ); |
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88 | } // if |
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89 | } // if |
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90 | } else if ( TupleExpr *tcond = dynamic_cast< TupleExpr * >( caseStmt->get_condition() ) ) { |
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91 | // case list |
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92 | assert( ! tcond->get_exprs().empty() ); |
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93 | for ( std::list< Expression * >::iterator i = tcond->get_exprs().begin(); i != tcond->get_exprs().end(); i++ ) |
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94 | newCaseLabels.push_back( *i ); // do I need to clone them? |
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95 | } // if |
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96 | |
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97 | std::list< Statement * > &stmts = caseStmt->get_statements(); |
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98 | mutateAll ( stmts, *this ); |
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99 | |
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100 | return caseStmt; |
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101 | } |
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102 | |
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103 | void CaseRangeMutator::fillRange( Expression *lo, Expression *hi ) { |
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104 | // generate the actual range ( and check for consistency ) |
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105 | Constant *c_lo, *c_hi; |
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106 | ConstantExpr *ce_lo, *ce_hi; |
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107 | ce_lo = dynamic_cast< ConstantExpr * >( lo ); |
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108 | ce_hi = dynamic_cast< ConstantExpr * >( hi ); |
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109 | |
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110 | if ( ce_lo && ce_hi ) { |
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111 | c_lo = ce_lo->get_constant(); c_hi = ce_hi->get_constant(); |
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112 | } /* else { |
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113 | if ( ! ce_lo ) ; |
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114 | if ( ! ce_hi ) ; |
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115 | } */ |
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116 | BasicType *ty_lo = dynamic_cast< BasicType * >( c_lo->get_type() ), |
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117 | *ty_hi = dynamic_cast< BasicType * >( c_hi->get_type() ); |
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118 | |
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119 | if ( ! ty_lo || ! ty_hi ) |
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120 | return; // one of them is not a constant |
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121 | |
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122 | switch ( ty_lo->get_kind() ) { |
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123 | case BasicType::Char: |
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124 | case BasicType::UnsignedChar: |
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125 | switch ( ty_hi->get_kind() ) { |
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126 | case BasicType::Char: |
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127 | case BasicType::UnsignedChar: |
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128 | // first case, they are both printable ASCII characters represented as 'x' |
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129 | if ( c_lo->get_value().size() == 3 && c_hi->get_value().size() == 3 ) { |
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130 | char ch_lo = ( c_lo->get_value())[1], ch_hi = ( c_hi->get_value())[1]; |
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131 | |
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132 | if ( ch_lo > ch_hi ) { char t=ch_lo; ch_lo=ch_hi; ch_hi=t; } |
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133 | |
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134 | for ( char c = ch_lo; c <= ch_hi; c++ ) { |
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135 | Type::Qualifiers q; |
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136 | Constant cnst( new BasicType( q, BasicType::Char ), |
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137 | std::string("'") + c + std::string("'") ); |
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138 | newCaseLabels.push_back( new ConstantExpr( cnst ) ); |
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139 | } // for |
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140 | |
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141 | return; |
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142 | } // if |
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143 | break; |
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144 | default: |
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145 | // error: incompatible constants |
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146 | break; |
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147 | } // switch |
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148 | break; |
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149 | case BasicType::ShortSignedInt: |
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150 | case BasicType::ShortUnsignedInt: |
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151 | case BasicType::SignedInt: |
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152 | case BasicType::UnsignedInt: |
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153 | case BasicType::LongSignedInt: |
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154 | case BasicType::LongUnsignedInt: |
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155 | case BasicType::LongLongSignedInt: |
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156 | case BasicType::LongLongUnsignedInt: |
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157 | switch ( ty_hi->get_kind() ) { |
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158 | case BasicType::ShortSignedInt: |
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159 | case BasicType::ShortUnsignedInt: |
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160 | case BasicType::SignedInt: |
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161 | case BasicType::UnsignedInt: |
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162 | case BasicType::LongSignedInt: |
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163 | case BasicType::LongUnsignedInt: |
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164 | case BasicType::LongLongSignedInt: |
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165 | case BasicType::LongLongUnsignedInt: { |
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166 | int i_lo = atoi( c_lo->get_value().c_str()), |
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167 | i_hi = atoi( c_hi->get_value().c_str()); |
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168 | |
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169 | if ( i_lo > i_hi ) { int t=i_lo; i_lo=i_hi; i_hi=t; } |
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170 | |
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171 | for ( int c = i_lo; c <= i_hi; c++ ) { |
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172 | Type::Qualifiers q; |
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173 | Constant cnst( new BasicType( q, ty_hi->get_kind()), // figure can't hurt (used to think in positives) |
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174 | toString< int >( c ) ); |
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175 | newCaseLabels.push_back( new ConstantExpr( cnst ) ); |
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176 | } |
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177 | |
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178 | return; |
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179 | } |
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180 | default: |
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181 | // error: incompatible constants |
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182 | break; |
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183 | } |
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184 | break; |
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185 | default: |
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186 | break; |
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187 | } // switch |
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188 | |
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189 | /* End: */{ |
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190 | // invalid range, signal a warning (it still generates the two case labels) |
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191 | newCaseLabels.push_back( lo ); |
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192 | newCaseLabels.push_back( hi ); |
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193 | return; |
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194 | } |
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195 | } |
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196 | } // namespace ControlStruct |
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197 | |
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198 | // Local Variables: // |
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199 | // tab-width: 4 // |
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200 | // mode: c++ // |
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201 | // compile-command: "make install" // |
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202 | // End: // |
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