1 | include "Clight/Csyntax.ma". |
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2 | |
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3 | definition add_cost_before : statement → universe CostTag → statement × (universe CostTag) ≝ |
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4 | λs,gen. |
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5 | let 〈l,gen〉 ≝ fresh … gen in |
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6 | 〈Scost l s, gen〉. |
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7 | |
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8 | definition add_cost_after : statement → universe CostTag → statement × (universe CostTag) ≝ |
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9 | λs,gen. |
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10 | let 〈l,gen〉 ≝ fresh … gen in |
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11 | 〈Ssequence s (Scost l Sskip), gen〉. |
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12 | |
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13 | definition add_cost_expr : expr → universe CostTag → expr × (universe CostTag) ≝ |
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14 | λe,gen. |
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15 | let 〈l,gen〉 ≝ fresh … gen in |
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16 | 〈Expr (Ecost l e) (typeof e), gen〉. |
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17 | |
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18 | definition const_int : nat → expr ≝ |
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19 | λn. Expr (Econst_int ? (repr I32 n)) (Tint I32 Signed). |
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20 | |
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21 | let rec label_expr (e:expr) (costgen:universe CostTag) |
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22 | on e : expr × (universe CostTag) ≝ |
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23 | match e with |
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24 | [ Expr ed ty ⇒ let 〈ed,costgen〉 ≝ label_expr_descr ed costgen ty in |
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25 | 〈Expr ed ty, costgen〉 |
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26 | ] |
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27 | and label_expr_descr (e:expr_descr) (costgen:universe CostTag) (ty:type) |
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28 | on e : expr_descr × (universe CostTag) ≝ |
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29 | match e with |
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30 | [ Ederef e' ⇒ |
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31 | let 〈e',costgen〉 ≝ label_expr e' costgen in |
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32 | 〈Ederef e', costgen〉 |
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33 | | Eaddrof e' ⇒ |
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34 | let 〈e',costgen〉 ≝ label_expr e' costgen in |
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35 | 〈Eaddrof e', costgen〉 |
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36 | | Eunop op e' ⇒ |
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37 | let 〈e',costgen〉 ≝ label_expr e' costgen in |
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38 | 〈Eunop op e', costgen〉 |
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39 | | Ebinop op e1 e2 ⇒ |
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40 | let 〈e1,costgen〉 ≝ label_expr e1 costgen in |
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41 | let 〈e2,costgen〉 ≝ label_expr e2 costgen in |
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42 | 〈Ebinop op e1 e2, costgen〉 |
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43 | | Ecast ty e' ⇒ |
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44 | let 〈e',costgen〉 ≝ label_expr e' costgen in |
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45 | 〈Ecast ty e', costgen〉 |
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46 | | Econdition e' e1 e2 ⇒ |
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47 | let 〈e',costgen〉 ≝ label_expr e' costgen in |
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48 | let 〈e1,costgen〉 ≝ label_expr e1 costgen in |
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49 | let 〈e1,costgen〉 ≝ add_cost_expr e1 costgen in |
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50 | let 〈e2,costgen〉 ≝ label_expr e2 costgen in |
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51 | let 〈e2,costgen〉 ≝ add_cost_expr e2 costgen in |
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52 | 〈Econdition e' e1 e2, costgen〉 |
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53 | (* andbool and orbool are changed to conditionals to capture their |
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54 | short-circuiting cost difference; note that we have to return 0 or 1 *) |
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55 | | Eandbool e1 e2 ⇒ |
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56 | let 〈e1,costgen〉 ≝ label_expr e1 costgen in |
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57 | let 〈e2,costgen〉 ≝ label_expr e2 costgen in |
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58 | let 〈e2,costgen〉 ≝ add_cost_expr (Expr (Econdition e2 (const_int 1) (const_int 0)) ty) costgen in |
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59 | let 〈ef,costgen〉 ≝ add_cost_expr (const_int 0) costgen in |
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60 | 〈Econdition e1 e2 ef, costgen〉 |
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61 | | Eorbool e1 e2 ⇒ |
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62 | let 〈e1,costgen〉 ≝ label_expr e1 costgen in |
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63 | let 〈et,costgen〉 ≝ add_cost_expr (const_int 1) costgen in |
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64 | let 〈e2,costgen〉 ≝ label_expr e2 costgen in |
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65 | let 〈e2,costgen〉 ≝ add_cost_expr (Expr (Econdition e2 (const_int 1) (const_int 0)) ty) costgen in |
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66 | 〈Econdition e1 et e2, costgen〉 |
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67 | |
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68 | | Efield e' id ⇒ |
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69 | let 〈e',costgen〉 ≝ label_expr e' costgen in |
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70 | 〈Efield e' id, costgen〉 |
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71 | (* The prototype asserts on preexisting cost labels, but I'd quite like to |
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72 | keep them. *) |
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73 | | Ecost l e' ⇒ |
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74 | let 〈e',costgen〉 ≝ label_expr e' costgen in |
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75 | 〈Ecost l e', costgen〉 |
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76 | |
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77 | (* The remaining expressions don't have subexpressions. *) |
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78 | | _ ⇒ 〈e,costgen〉 |
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79 | ]. |
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80 | |
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81 | let rec label_exprs (l:list expr) (costgen:universe CostTag) |
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82 | on l : list expr × (universe CostTag) ≝ |
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83 | match l with |
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84 | [ nil ⇒ 〈nil ?,costgen〉 |
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85 | | cons e es ⇒ |
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86 | let 〈e,costgen〉 ≝ label_expr e costgen in |
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87 | let 〈es,costgen〉 ≝ label_exprs es costgen in |
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88 | 〈e::es,costgen〉 |
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89 | ]. |
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90 | |
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91 | definition label_opt_expr ≝ |
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92 | λoe,costgen. match oe with |
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93 | [ None ⇒ 〈None ?, costgen〉 |
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94 | | Some e ⇒ let 〈e,costgen〉 ≝ label_expr e costgen in 〈Some ? e,costgen〉 |
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95 | ]. |
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96 | |
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97 | |
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98 | let rec label_statement (s:statement) (costgen:universe CostTag) |
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99 | on s : statement × (universe CostTag) ≝ |
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100 | match s with |
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101 | [ Sskip ⇒ 〈Sskip,costgen〉 |
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102 | | Sassign e1 e2 ⇒ |
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103 | let 〈e1,costgen〉 ≝ label_expr e1 costgen in |
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104 | let 〈e2,costgen〉 ≝ label_expr e2 costgen in |
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105 | 〈Sassign e1 e2, costgen〉 |
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106 | | Scall e_ret e_fn e_args ⇒ |
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107 | let 〈e_ret,costgen〉 ≝ label_opt_expr e_ret costgen in |
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108 | let 〈e_fn,costgen〉 ≝ label_expr e_fn costgen in |
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109 | let 〈e_args,costgen〉 ≝ label_exprs e_args costgen in |
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110 | 〈Scall e_ret e_fn e_args, costgen〉 |
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111 | | Ssequence s1 s2 ⇒ |
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112 | let 〈s1,costgen〉 ≝ label_statement s1 costgen in |
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113 | let 〈s2,costgen〉 ≝ label_statement s2 costgen in |
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114 | 〈Ssequence s1 s2, costgen〉 |
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115 | | Sifthenelse e s1 s2 ⇒ |
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116 | let 〈e,costgen〉 ≝ label_expr e costgen in |
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117 | let 〈s1,costgen〉 ≝ label_statement s1 costgen in |
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118 | let 〈s1,costgen〉 ≝ add_cost_before s1 costgen in |
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119 | let 〈s2,costgen〉 ≝ label_statement s2 costgen in |
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120 | let 〈s2,costgen〉 ≝ add_cost_before s2 costgen in |
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121 | 〈Sifthenelse e s1 s2, costgen〉 |
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122 | | Swhile e s' ⇒ |
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123 | let 〈e,costgen〉 ≝ label_expr e costgen in |
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124 | let 〈s',costgen〉 ≝ label_statement s' costgen in |
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125 | let 〈s',costgen〉 ≝ add_cost_before s' costgen in |
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126 | let 〈s,costgen〉 ≝ add_cost_after (Swhile e s') costgen in |
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127 | 〈s,costgen〉 |
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128 | | Sdowhile e s' ⇒ |
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129 | let 〈e,costgen〉 ≝ label_expr e costgen in |
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130 | let 〈s',costgen〉 ≝ label_statement s' costgen in |
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131 | let 〈s',costgen〉 ≝ add_cost_before s' costgen in |
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132 | let 〈s,costgen〉 ≝ add_cost_after (Sdowhile e s') costgen in |
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133 | 〈s,costgen〉 |
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134 | | Sfor s1 e s2 s3 ⇒ |
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135 | let 〈e,costgen〉 ≝ label_expr e costgen in |
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136 | let 〈s1,costgen〉 ≝ label_statement s1 costgen in |
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137 | let 〈s2,costgen〉 ≝ label_statement s2 costgen in |
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138 | let 〈s3,costgen〉 ≝ label_statement s3 costgen in |
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139 | let 〈s3,costgen〉 ≝ add_cost_before s3 costgen in |
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140 | let 〈s,costgen〉 ≝ add_cost_after (Sfor s1 e s2 s3) costgen in |
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141 | 〈s,costgen〉 |
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142 | | Sbreak ⇒ 〈Sbreak,costgen〉 |
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143 | | Scontinue ⇒ 〈Scontinue,costgen〉 |
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144 | | Sreturn opt_e ⇒ |
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145 | let 〈opt_e,costgen〉 ≝ label_opt_expr opt_e costgen in |
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146 | 〈Sreturn opt_e,costgen〉 |
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147 | | Sswitch e ls ⇒ |
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148 | let 〈e,costgen〉 ≝ label_expr e costgen in |
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149 | let 〈ls,costgen〉 ≝ label_lstatements ls costgen in |
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150 | 〈Sswitch e ls, costgen〉 |
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151 | | Slabel l s' ⇒ |
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152 | let 〈s',costgen〉 ≝ label_statement s' costgen in |
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153 | let 〈s',costgen〉 ≝ add_cost_before s' costgen in |
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154 | 〈Slabel l s', costgen〉 |
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155 | | Sgoto l ⇒ 〈Sgoto l, costgen〉 |
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156 | |
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157 | (* The prototype asserts on preexisting cost labels, but I'd quite like to |
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158 | keep them. *) |
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159 | | Scost l s' ⇒ |
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160 | let 〈s',costgen〉 ≝ label_statement s' costgen in |
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161 | 〈Scost l s', costgen〉 |
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162 | ] |
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163 | and label_lstatements (ls:labeled_statements) (costgen:universe CostTag) |
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164 | on ls : labeled_statements × (universe CostTag) ≝ |
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165 | match ls with |
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166 | [ LSdefault s ⇒ |
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167 | let 〈s,costgen〉 ≝ label_statement s costgen in |
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168 | let 〈s,costgen〉 ≝ add_cost_before s costgen in |
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169 | 〈LSdefault s, costgen〉 |
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170 | | LScase sz i s ls' ⇒ |
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171 | let 〈s,costgen〉 ≝ label_statement s costgen in |
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172 | let 〈s,costgen〉 ≝ add_cost_before s costgen in |
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173 | let 〈ls',costgen〉 ≝ label_lstatements ls' costgen in |
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174 | 〈LScase sz i s ls', costgen〉 |
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175 | ]. |
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176 | |
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177 | definition label_function : function → function ≝ |
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178 | λf. |
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179 | let costgen ≝ new_universe CostTag in |
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180 | let 〈body,costgen〉 ≝ label_statement (fn_body f) costgen in |
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181 | let 〈body,costgen〉 ≝ add_cost_before body costgen in |
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182 | mk_function (fn_return f) (fn_params f) (fn_vars f) body. |
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183 | |
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184 | definition label_fundef : clight_fundef → clight_fundef ≝ |
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185 | λf. match f with |
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186 | [ CL_Internal f ⇒ CL_Internal (label_function f) |
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187 | | CL_External id args ty ⇒ CL_External id args ty |
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188 | ]. |
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189 | |
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190 | definition clight_label : clight_program → clight_program ≝ |
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191 | λp. transform_program … p label_fundef. |
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