1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2020 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 | // list -- lets a user-defined stuct form intrusive linked lists |
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8 | // |
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9 | // Author : Michael Brooks |
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10 | // Created On : Wed Apr 22 18:00:00 2020 |
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11 | // Last Modified By : Michael Brooks |
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12 | // Last Modified On : Wed Apr 22 18:00:00 2020 |
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13 | // Update Count : 1 |
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14 | // |
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15 | |
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16 | #include <assert.h> |
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17 | |
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18 | #define __DLISTED_MGD_COMMON(ELEM, NODE, LINKS_FLD) \ |
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19 | static inline ELEM& $tempcv_n2e(NODE &node) { \ |
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20 | return node; \ |
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21 | } \ |
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22 | \ |
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23 | static inline NODE& $tempcv_e2n(ELEM &node) { \ |
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24 | return node; \ |
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25 | } \ |
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26 | \ |
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27 | static inline ELEM & ?`prev(NODE &node) { \ |
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28 | $dlinks(ELEM) & ls = node.LINKS_FLD; \ |
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29 | $mgd_link(ELEM) * l = &ls.prev; \ |
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30 | ELEM * e = l->elem; \ |
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31 | return *e; \ |
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32 | } \ |
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33 | \ |
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34 | static inline ELEM & ?`next(NODE &node) { \ |
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35 | $dlinks(ELEM) & ls = node.LINKS_FLD; \ |
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36 | $mgd_link(ELEM) * l = &ls.next; \ |
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37 | ELEM * e = l->elem; \ |
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38 | return *e; \ |
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39 | } \ |
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40 | \ |
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41 | static inline $mgd_link(ELEM) & $prev_link(NODE &node) { \ |
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42 | $dlinks(ELEM) & ls = node.LINKS_FLD; \ |
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43 | $mgd_link(ELEM) * l = &ls.prev; \ |
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44 | return *l; \ |
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45 | } \ |
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46 | \ |
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47 | static inline $mgd_link(ELEM) & $next_link(NODE &node) { \ |
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48 | $dlinks(ELEM) & ls = node.LINKS_FLD; \ |
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49 | $mgd_link(ELEM) * l = &ls.next; \ |
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50 | return *l; \ |
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51 | } |
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52 | |
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53 | #define __DLISTED_MGD_JUSTEXPL(STRUCT, IN_THELIST, STRUCT_IN_THELIST) \ |
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54 | struct STRUCT_IN_THELIST { \ |
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55 | inline STRUCT; \ |
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56 | }; \ |
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57 | \ |
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58 | void ?{}(STRUCT_IN_THELIST &) = void; \ |
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59 | \ |
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60 | static inline STRUCT_IN_THELIST& ?`IN_THELIST(STRUCT &this) { \ |
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61 | return (STRUCT_IN_THELIST&)this; \ |
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62 | } |
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63 | |
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64 | #define __DLISTED_MGD_JUSTIMPL(STRUCT) |
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65 | |
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66 | forall( dtype tE ) { |
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67 | struct $mgd_link { |
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68 | tE *elem; |
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69 | void *terminator; |
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70 | _Bool is_terminator; |
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71 | // will collapse to single pointer with tag bit |
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72 | }; |
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73 | static inline void ?{}( $mgd_link(tE) &this, tE* elem ) { |
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74 | (this.elem){ elem }; |
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75 | (this.terminator){ 0p }; |
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76 | (this.is_terminator){ 0 }; |
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77 | } |
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78 | static inline void ?{}( $mgd_link(tE) &this, void * terminator ) { |
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79 | (this.elem){ 0p }; |
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80 | (this.terminator){ terminator }; |
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81 | (this.is_terminator){ 1 }; |
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82 | } |
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83 | forall ( otype tInit | { void ?{}( $mgd_link(tE) &, tInit); } ) |
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84 | static inline void ?=?( $mgd_link(tE) &this, tInit i ) { |
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85 | ^?{}( this ); |
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86 | ?{}( this, i ); |
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87 | } |
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88 | struct $dlinks { |
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89 | // containing item is not listed |
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90 | // iff |
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91 | // links have (elem == 0p && terminator == 0p) |
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92 | $mgd_link(tE) next; |
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93 | $mgd_link(tE) prev; |
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94 | }; |
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95 | static inline void ?{}( $dlinks(tE) &this ) { |
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96 | (this.next){ (tE *)0p }; |
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97 | (this.prev){ (tE *)0p }; |
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98 | } |
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99 | } |
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100 | |
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101 | #define DLISTED_MGD_EXPL_IN(STRUCT, LIST_SUF) \ |
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102 | $dlinks(STRUCT) $links_ ## LIST_SUF; |
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103 | |
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104 | #define DLISTED_MGD_EXPL_OUT(STRUCT, LIST_SUF) \ |
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105 | __DLISTED_MGD_JUSTEXPL(STRUCT, in_##LIST_SUF, STRUCT ## _in_ ## LIST_SUF) \ |
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106 | __DLISTED_MGD_COMMON(STRUCT, STRUCT##_in_##LIST_SUF, $links_ ## LIST_SUF) |
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107 | |
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108 | #define DLISTED_MGD_IMPL_IN(STRUCT) \ |
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109 | $dlinks(STRUCT) $links; |
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110 | |
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111 | #define DLISTED_MGD_IMPL_OUT(STRUCT) \ |
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112 | __DLISTED_MGD_JUSTIMPL(STRUCT) \ |
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113 | __DLISTED_MGD_COMMON(STRUCT, STRUCT, $links) |
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114 | |
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115 | trait $dlistable(dtype Tnode, dtype Telem) { |
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116 | $mgd_link(Telem) & $prev_link(Tnode &); |
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117 | $mgd_link(Telem) & $next_link(Tnode &); |
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118 | Telem& $tempcv_n2e(Tnode &); |
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119 | Tnode& $tempcv_e2n(Telem &); |
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120 | }; |
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121 | |
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122 | forall (dtype Tnode, dtype Telem | $dlistable(Tnode, Telem)) { |
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123 | |
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124 | // implemented as a sentinel item in an underlying cicrular list |
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125 | // theList.$links.next is first |
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126 | // theList.$links.prev is last |
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127 | // note this allocation preserves prev-next composition as an identity |
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128 | struct dlist { |
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129 | $dlinks(Telem) $links; |
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130 | }; |
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131 | |
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132 | // an empty dlist |
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133 | // links refer to self, making a tight circle |
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134 | static inline void ?{}( dlist(Tnode, Telem) & this ) { |
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135 | $mgd_link(Telem) selfRef = (void *) &this; |
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136 | ( this.$links ) { selfRef, selfRef }; |
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137 | } |
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138 | |
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139 | static inline Telem & ?`first( dlist(Tnode, Telem) &l ) { |
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140 | return * l.$links.next.elem; |
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141 | } |
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142 | |
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143 | static inline Telem & ?`last( dlist(Tnode, Telem) &l ) { |
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144 | return * l.$links.prev.elem; |
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145 | } |
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146 | |
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147 | #if !defined(NDEBUG) && (defined(__CFA_DEBUG__) || defined(__CFA_VERIFY__)) |
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148 | static bool $validate_fwd( dlist(Tnode, Telem) & this ) { |
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149 | Tnode * it = & $tempcv_e2n( this`first ); |
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150 | if (!it) return (& this`last == 0p); |
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151 | |
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152 | while( $next_link(*it).elem ) { |
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153 | it = & $tempcv_e2n( * $next_link(*it).elem ); |
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154 | } |
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155 | |
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156 | return ( it == & $tempcv_e2n( this`last ) ) && |
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157 | ( $next_link(*it).is_terminator ) && |
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158 | ( ((dlist(Tnode, Telem)*)$next_link(*it).terminator) == &this ); |
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159 | } |
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160 | static bool $validate_rev( dlist(Tnode, Telem) & this ) { |
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161 | Tnode * it = & $tempcv_e2n( this`last ); |
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162 | if (!it) return (& this`first == 0p); |
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163 | |
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164 | while( $prev_link(*it).elem ) { |
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165 | it = & $tempcv_e2n( * $prev_link(*it).elem ); |
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166 | } |
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167 | |
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168 | return ( it == & $tempcv_e2n( this`first ) ) && |
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169 | ( $prev_link(*it).is_terminator ) && |
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170 | ( ((dlist(Tnode, Telem)*)$prev_link(*it).terminator) == &this ); |
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171 | } |
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172 | static bool validate( dlist(Tnode, Telem) & this ) { |
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173 | return $validate_fwd(this) && $validate_rev(this); |
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174 | } |
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175 | #endif |
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176 | |
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177 | static inline void insert_after(Tnode &list_pos, Telem &to_insert) { |
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178 | assert (&list_pos != 0p); |
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179 | assert (&to_insert != 0p); |
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180 | Tnode &singleton_to_insert = $tempcv_e2n(to_insert); |
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181 | assert($prev_link(singleton_to_insert).elem == 0p); |
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182 | assert($next_link(singleton_to_insert).elem == 0p); |
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183 | $prev_link(singleton_to_insert) = & $tempcv_n2e(list_pos); |
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184 | $next_link(singleton_to_insert) = $next_link(list_pos); |
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185 | if ($next_link(list_pos).is_terminator) { |
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186 | dlist(Tnode, Telem) *list = $next_link(list_pos).terminator; |
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187 | $dlinks(Telem) *list_links = & list->$links; |
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188 | $mgd_link(Telem) *list_last = & list_links->prev; |
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189 | *list_last = &to_insert; |
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190 | } else { |
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191 | Telem *list_pos_next = $next_link(list_pos).elem; |
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192 | if (list_pos_next) { |
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193 | Tnode & lpn_inlist = $tempcv_e2n(*list_pos_next); |
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194 | $prev_link(lpn_inlist) = &to_insert; |
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195 | } |
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196 | } |
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197 | $next_link(list_pos) = &to_insert; |
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198 | } |
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199 | |
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200 | static inline void insert_before(Tnode &list_pos, Telem &to_insert) { |
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201 | assert (&list_pos != 0p); |
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202 | assert (&to_insert != 0p); |
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203 | Tnode &singleton_to_insert = $tempcv_e2n(to_insert); |
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204 | assert($prev_link(singleton_to_insert).elem == 0p); |
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205 | assert($next_link(singleton_to_insert).elem == 0p); |
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206 | $next_link(singleton_to_insert) = & $tempcv_n2e(list_pos); |
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207 | $prev_link(singleton_to_insert) = $prev_link(list_pos); |
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208 | if ($prev_link(list_pos).is_terminator) { |
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209 | dlist(Tnode, Telem) *list = $prev_link(list_pos).terminator; |
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210 | $dlinks(Telem) *list_links = & list->$links; |
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211 | $mgd_link(Telem) *list_first = & list_links->next; |
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212 | *list_first = &to_insert; |
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213 | } else { |
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214 | Telem *list_pos_prev = $prev_link(list_pos).elem; |
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215 | if (list_pos_prev) { |
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216 | Tnode & lpp_inlist = $tempcv_e2n(*list_pos_prev); |
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217 | $next_link(lpp_inlist) = &to_insert; |
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218 | } |
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219 | } |
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220 | $prev_link(list_pos) = &to_insert; |
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221 | } |
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222 | |
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223 | static inline void insert_first(dlist(Tnode, Telem) &list, Telem &to_insert) { |
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224 | assert (&list != 0p); |
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225 | assert (&to_insert != 0p); |
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226 | Tnode &singleton_to_insert = $tempcv_e2n(to_insert); |
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227 | assert($prev_link(singleton_to_insert).elem == 0p); |
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228 | assert($next_link(singleton_to_insert).elem == 0p); |
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229 | |
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230 | $prev_link(singleton_to_insert) = (void*) &list; |
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231 | $next_link(singleton_to_insert) = list.$links.next; |
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232 | |
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233 | $dlinks(Telem) *listLinks = & list.$links; |
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234 | if (listLinks->next.is_terminator) { |
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235 | $mgd_link(Telem) * listPrevReference = & listLinks->prev; |
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236 | *listPrevReference = &to_insert; |
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237 | } else { |
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238 | Tnode & next_inlist = $tempcv_e2n(*list.$links.next.elem); |
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239 | $prev_link(next_inlist) = &to_insert; |
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240 | } |
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241 | $mgd_link(Telem) * listNextReference = & listLinks->next; |
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242 | *listNextReference = &to_insert; |
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243 | } |
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244 | |
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245 | static inline void insert_last(dlist(Tnode, Telem) &list, Telem &to_insert) { |
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246 | assert (&list != 0p); |
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247 | assert (&to_insert != 0p); |
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248 | Tnode &singleton_to_insert = $tempcv_e2n(to_insert); |
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249 | assert($next_link(singleton_to_insert).elem == 0p); |
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250 | assert($prev_link(singleton_to_insert).elem == 0p); |
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251 | |
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252 | $next_link(singleton_to_insert) = (void*) &list; |
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253 | $prev_link(singleton_to_insert) = list.$links.prev; |
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254 | |
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255 | $dlinks(Telem) *listLinks = & list.$links; |
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256 | if (listLinks->prev.is_terminator) { |
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257 | $mgd_link(Telem) * listNextReference = & listLinks->next; |
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258 | *listNextReference = &to_insert; |
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259 | } else { |
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260 | Tnode & prev_inlist = $tempcv_e2n(*list.$links.prev.elem); |
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261 | $next_link(prev_inlist) = &to_insert; |
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262 | } |
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263 | $mgd_link(Telem) * listPrevReference = & listLinks->prev; |
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264 | *listPrevReference = &to_insert; |
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265 | } |
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266 | |
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267 | static inline void remove(Tnode &list_pos) { |
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268 | assert( &list_pos != 0p ); |
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269 | |
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270 | $mgd_link(Telem) &incoming_from_prev = *0p; |
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271 | $mgd_link(Telem) &incoming_from_next = *0p; |
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272 | |
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273 | if ( $prev_link(list_pos).is_terminator ) { |
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274 | dlist(Tnode, Telem) * tgt_before = $prev_link(list_pos).terminator; |
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275 | $dlinks(Telem) * links_before = & tgt_before->$links; |
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276 | &incoming_from_prev = & links_before->next; |
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277 | } else if ($prev_link(list_pos).elem) { |
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278 | Telem * tgt_before = $prev_link(list_pos).elem; |
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279 | Tnode & list_pos_before = $tempcv_e2n(*tgt_before); |
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280 | &incoming_from_prev = & $next_link(list_pos_before); |
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281 | } |
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282 | |
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283 | if ( $next_link(list_pos).is_terminator ) { |
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284 | dlist(Tnode, Telem) * tgt_after = $next_link(list_pos).terminator; |
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285 | $dlinks(Telem) * links_after = & tgt_after->$links; |
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286 | &incoming_from_next = & links_after->prev; |
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287 | } else if ($next_link(list_pos).elem) { |
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288 | Telem * tgt_after = $next_link(list_pos).elem; |
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289 | Tnode & list_pos_after = $tempcv_e2n(*tgt_after ); |
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290 | &incoming_from_next = & $prev_link(list_pos_after ); |
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291 | } |
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292 | |
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293 | if (& incoming_from_prev) { |
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294 | incoming_from_prev = $next_link(list_pos); |
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295 | } |
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296 | if (& incoming_from_next) { |
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297 | incoming_from_next = $prev_link(list_pos); |
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298 | } |
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299 | |
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300 | $next_link(list_pos) = (Telem*) 0p; |
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301 | $prev_link(list_pos) = (Telem*) 0p; |
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302 | } |
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303 | } |
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304 | |
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