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 | // Cost.h -- |
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8 | // |
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9 | // Author : Richard C. Bilson |
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10 | // Created On : Sun May 17 09:39:50 2015 |
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11 | // Last Modified By : Aaron B. Moss |
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12 | // Last Modified On : Fri Oct 05 14:32:00 2018 |
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13 | // Update Count : 7 |
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14 | // |
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15 | |
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16 | #pragma once |
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17 | |
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18 | #include <iostream> |
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19 | |
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20 | namespace ResolvExpr { |
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21 | class Cost { |
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22 | private: |
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23 | Cost( int unsafeCost, int polyCost, int varCost, int specCost, int safeCost, |
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24 | int referenceCost ); |
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25 | |
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26 | public: |
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27 | Cost & incUnsafe( int inc = 1 ); |
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28 | Cost & incPoly( int inc = 1 ); |
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29 | Cost & incVar( int inc = 1 ); |
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30 | Cost & decSpec( int inc = 1 ); |
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31 | Cost & incSafe( int inc = 1 ); |
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32 | Cost & incReference( int inc = 1 ); |
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33 | |
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34 | int get_unsafeCost() const { return unsafeCost; } |
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35 | int get_polyCost() const { return polyCost; } |
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36 | int get_varCost() const { return varCost; } |
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37 | int get_specCost() const { return specCost; } |
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38 | int get_safeCost() const { return safeCost; } |
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39 | int get_referenceCost() const { return referenceCost; } |
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40 | |
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41 | Cost operator+( const Cost &other ) const; |
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42 | Cost operator-( const Cost &other ) const; |
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43 | Cost &operator+=( const Cost &other ); |
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44 | bool operator<( const Cost &other ) const; |
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45 | bool operator==( const Cost &other ) const; |
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46 | bool operator!=( const Cost &other ) const; |
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47 | friend std::ostream &operator<<( std::ostream &os, const Cost &cost ); |
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48 | // returns negative for *this < other, 0 for *this == other, positive for *this > other |
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49 | int compare( const Cost &other ) const; |
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50 | |
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51 | static const Cost zero; |
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52 | static const Cost infinity; |
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53 | |
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54 | static const Cost unsafe; |
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55 | static const Cost poly; |
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56 | static const Cost var; |
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57 | static const Cost spec; |
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58 | static const Cost safe; |
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59 | static const Cost reference; |
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60 | |
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61 | private: |
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62 | int unsafeCost; ///< Unsafe (narrowing) conversions |
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63 | int polyCost; ///< Count of parameters and return values bound to some poly type |
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64 | int varCost; ///< Count of polymorphic type variables |
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65 | int specCost; ///< Polymorphic type specializations (type assertions), negative cost |
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66 | int safeCost; ///< Safe (widening) conversions |
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67 | int referenceCost; ///< reference conversions |
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68 | }; |
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69 | |
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70 | inline Cost::Cost( int unsafeCost, int polyCost, int varCost, int specCost, int safeCost, |
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71 | int referenceCost ) |
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72 | : unsafeCost( unsafeCost ), polyCost( polyCost ), varCost( varCost ), specCost( specCost ), |
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73 | safeCost( safeCost ), referenceCost( referenceCost ) {} |
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74 | |
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75 | inline Cost & Cost::incUnsafe( int inc ) { |
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76 | if ( *this == infinity ) return *this; |
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77 | unsafeCost += inc; |
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78 | return *this; |
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79 | } |
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80 | |
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81 | inline Cost & Cost::incPoly( int inc ) { |
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82 | if ( *this == infinity ) return *this; |
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83 | polyCost += inc; |
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84 | return *this; |
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85 | } |
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86 | |
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87 | inline Cost & Cost::incVar( int inc ) { |
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88 | if ( *this == infinity ) return *this; |
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89 | varCost += inc; |
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90 | return *this; |
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91 | } |
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92 | |
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93 | inline Cost& Cost::decSpec( int dec ) { |
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94 | if ( *this == infinity ) return *this; |
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95 | specCost -= dec; |
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96 | return *this; |
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97 | } |
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98 | |
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99 | inline Cost & Cost::incSafe( int inc ) { |
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100 | if ( *this == infinity ) return *this; |
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101 | safeCost += inc; |
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102 | return *this; |
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103 | } |
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104 | |
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105 | inline Cost & Cost::incReference( int inc ) { |
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106 | if ( *this == infinity ) return *this; |
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107 | referenceCost += inc; |
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108 | return *this; |
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109 | } |
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110 | |
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111 | inline Cost Cost::operator+( const Cost &other ) const { |
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112 | if ( *this == infinity || other == infinity ) return infinity; |
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113 | return Cost{ |
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114 | unsafeCost + other.unsafeCost, polyCost + other.polyCost, |
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115 | varCost + other.varCost, specCost + other.specCost, |
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116 | safeCost + other.safeCost, referenceCost + other.referenceCost }; |
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117 | } |
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118 | |
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119 | inline Cost Cost::operator-( const Cost &other ) const { |
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120 | if ( *this == infinity || other == infinity ) return infinity; |
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121 | return Cost{ |
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122 | unsafeCost - other.unsafeCost, polyCost - other.polyCost, |
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123 | varCost - other.varCost, specCost - other.specCost, |
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124 | safeCost - other.safeCost, referenceCost - other.referenceCost }; |
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125 | } |
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126 | |
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127 | inline Cost &Cost::operator+=( const Cost &other ) { |
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128 | if ( *this == infinity ) return *this; |
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129 | if ( other == infinity ) { |
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130 | *this = infinity; |
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131 | return *this; |
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132 | } |
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133 | unsafeCost += other.unsafeCost; |
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134 | polyCost += other.polyCost; |
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135 | varCost += other.varCost; |
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136 | specCost += other.specCost; |
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137 | safeCost += other.safeCost; |
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138 | referenceCost += other.referenceCost; |
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139 | return *this; |
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140 | } |
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141 | |
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142 | inline bool Cost::operator<( const Cost &other ) const { |
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143 | if ( *this == infinity ) return false; |
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144 | if ( other == infinity ) return true; |
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145 | |
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146 | if ( unsafeCost > other.unsafeCost ) { |
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147 | return false; |
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148 | } else if ( unsafeCost < other.unsafeCost ) { |
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149 | return true; |
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150 | } else if ( polyCost > other.polyCost ) { |
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151 | return false; |
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152 | } else if ( polyCost < other.polyCost ) { |
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153 | return true; |
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154 | } else if ( varCost > other.varCost ) { |
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155 | return false; |
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156 | } else if ( varCost < other.varCost ) { |
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157 | return true; |
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158 | } else if ( specCost > other.specCost ) { |
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159 | return false; |
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160 | } else if ( specCost > other.specCost ) { |
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161 | return true; |
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162 | } else if ( safeCost > other.safeCost ) { |
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163 | return false; |
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164 | } else if ( safeCost < other.safeCost ) { |
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165 | return true; |
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166 | } else if ( referenceCost > other.referenceCost ) { |
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167 | return false; |
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168 | } else if ( referenceCost < other.referenceCost ) { |
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169 | return true; |
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170 | } else { |
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171 | return false; |
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172 | } // if |
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173 | } |
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174 | |
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175 | inline int Cost::compare( const Cost &other ) const { |
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176 | if ( *this == infinity ) return +1; |
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177 | if ( other == infinity ) return -1; |
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178 | |
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179 | int c = unsafeCost - other.unsafeCost; if ( c ) return c; |
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180 | c = polyCost - other.polyCost; if ( c ) return c; |
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181 | c = varCost - other.varCost; if ( c ) return c; |
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182 | c = specCost - other.specCost; if ( c ) return c; |
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183 | c = safeCost - other.safeCost; if ( c ) return c; |
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184 | return referenceCost - other.referenceCost; |
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185 | } |
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186 | |
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187 | inline bool Cost::operator==( const Cost &other ) const { |
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188 | return unsafeCost == other.unsafeCost |
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189 | && polyCost == other.polyCost |
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190 | && varCost == other.varCost |
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191 | && specCost == other.specCost |
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192 | && safeCost == other.safeCost |
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193 | && referenceCost == other.referenceCost; |
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194 | } |
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195 | |
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196 | inline bool Cost::operator!=( const Cost &other ) const { |
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197 | return !( *this == other ); |
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198 | } |
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199 | |
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200 | inline std::ostream &operator<<( std::ostream &os, const Cost &cost ) { |
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201 | return os << "( " << cost.unsafeCost << ", " << cost.polyCost << ", " |
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202 | << cost.varCost << ", " << cost.specCost << ", " |
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203 | << cost.safeCost << ", " << cost.referenceCost << " )"; |
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204 | } |
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205 | } // namespace ResolvExpr |
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206 | |
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207 | // Local Variables: // |
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208 | // tab-width: 4 // |
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209 | // mode: c++ // |
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210 | // compile-command: "make install" // |
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211 | // End: // |
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