1 | include "ASM/Util.ma". |
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2 | include "ERTLptr/ERTLptr.ma". |
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3 | include "utilities/adt/set_adt.ma". |
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4 | include "utilities/fixpoints.ma". |
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5 | |
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6 | definition register_lattice : property_lattice ≝ |
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7 | mk_property_lattice |
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8 | ((set register) × (set Register)) |
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9 | 〈set_empty …, set_empty …〉 |
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10 | (λleft. |
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11 | λright. |
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12 | set_equal … (eq_identifier ?) (\fst left) (\fst right) ∧ |
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13 | set_equal … eq_Register (\snd left) (\snd right)) |
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14 | (λleft. |
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15 | λright. |
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16 | set_subset … (eq_identifier ?) (\fst left) (\fst right) ∧ |
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17 | set_subset … eq_Register (\snd left) (\snd right)) |
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18 | (λ_.false). |
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19 | |
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20 | definition rl_bottom ≝ l_bottom register_lattice. |
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21 | definition rl_psingleton: register → register_lattice ≝ |
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22 | λr. |
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23 | 〈set_singleton … r, set_empty …〉. |
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24 | definition rl_hsingleton: Register → register_lattice ≝ |
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25 | λr. |
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26 | 〈set_empty …, set_singleton … r〉. |
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27 | |
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28 | definition rl_join: register_lattice → register_lattice → register_lattice ≝ |
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29 | λleft. |
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30 | λright. |
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31 | let 〈lp, lh〉 ≝ left in |
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32 | let 〈rp, rh〉 ≝ right in |
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33 | 〈set_union … lp rp, set_union … lh rh〉. |
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34 | |
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35 | definition rl_diff: register_lattice → register_lattice → register_lattice ≝ |
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36 | λleft. |
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37 | λright. |
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38 | let 〈lp, lh〉 ≝ left in |
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39 | let 〈rp, rh〉 ≝ right in |
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40 | 〈set_diff … lp rp, set_diff … lh rh〉. |
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41 | |
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42 | definition defined ≝ |
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43 | λglobals: list ident. |
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44 | λs: joint_statement ERTLptr globals. |
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45 | match s with |
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46 | [ sequential seq l ⇒ |
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47 | match seq with |
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48 | [ step_seq s ⇒ |
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49 | match s with |
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50 | [ OP2 op2 r1 r2 _ ⇒ |
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51 | match op2 with |
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52 | [ Add ⇒ rl_join (rl_hsingleton RegisterCarry) (rl_psingleton r1) |
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53 | | Addc ⇒ rl_join (rl_hsingleton RegisterCarry) (rl_psingleton r1) |
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54 | | Sub ⇒ rl_join (rl_hsingleton RegisterCarry) (rl_psingleton r1) |
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55 | | _ ⇒ rl_psingleton r1 |
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56 | ] |
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57 | | CLEAR_CARRY ⇒ rl_hsingleton RegisterCarry |
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58 | | SET_CARRY ⇒ rl_hsingleton RegisterCarry |
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59 | | OPACCS opaccs dr1 dr2 sr1 sr2 ⇒ |
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60 | rl_join (rl_join (rl_psingleton dr1) |
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61 | (rl_psingleton dr2)) |
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62 | (rl_hsingleton RegisterCarry) |
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63 | | OP1 op1 r1 r2 ⇒ rl_psingleton r1 |
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64 | | POP r ⇒ rl_psingleton r |
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65 | | ADDRESS _ _ r1 r2 ⇒ rl_join (rl_psingleton r1) (rl_psingleton r2) |
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66 | | LOAD r _ _ ⇒ rl_psingleton r |
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67 | | COMMENT c ⇒ rl_bottom |
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68 | | STORE acc_a dpl dph ⇒ rl_bottom |
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69 | | PUSH r ⇒ rl_bottom |
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70 | | MOVE pair_reg ⇒ |
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71 | (* first register relevant only *) |
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72 | match \fst pair_reg with |
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73 | [ PSD p ⇒ rl_psingleton p |
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74 | | HDW h ⇒ rl_hsingleton h |
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75 | ] |
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76 | | extension_seq ext ⇒ |
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77 | match ext with |
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78 | [ ertlptr_ertl ext' ⇒ |
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79 | match ext' with |
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80 | [ ertl_new_frame ⇒ rl_join (rl_hsingleton RegisterSPL) (rl_hsingleton RegisterSPH) |
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81 | | ertl_del_frame ⇒ rl_join (rl_hsingleton RegisterSPL) (rl_hsingleton RegisterSPH) |
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82 | | ertl_frame_size r ⇒ rl_psingleton r |
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83 | ] |
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84 | | LOW_ADDRESS r1 l ⇒ rl_psingleton r1 |
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85 | | HIGH_ADDRESS r1 l ⇒ rl_psingleton r1 |
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86 | ] |
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87 | (* Potentially destroys all caller-save hardware registers. *) |
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88 | ] |
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89 | | CALL _ _ _ ⇒ 〈set_empty …, set_from_list … RegisterCallerSaved〉 |
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90 | | COND r lbl_true ⇒ rl_bottom |
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91 | | COST_LABEL clabel ⇒ rl_bottom |
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92 | ] |
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93 | | final _ ⇒ rl_bottom |
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94 | | FCOND abs _ _ _ ⇒ Ⓧabs |
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95 | ]. |
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96 | |
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97 | definition ret_regs ≝ set_from_list … RegisterRets. |
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98 | |
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99 | definition rl_arg : psd_argument → register_lattice ≝ |
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100 | λarg.match arg with |
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101 | [ Imm _ ⇒ rl_bottom |
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102 | | Reg r ⇒ rl_psingleton r |
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103 | ]. |
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104 | |
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105 | definition used ≝ |
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106 | λglobals: list ident. |
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107 | λs: joint_statement ERTLptr globals. |
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108 | match s with |
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109 | [ sequential seq l ⇒ |
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110 | match seq with |
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111 | [ step_seq s ⇒ |
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112 | match s with |
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113 | [ OP2 op2 acc_a r1 r2 ⇒ |
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114 | rl_join (rl_join (rl_arg r1) (rl_arg r2)) |
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115 | (match op2 with |
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116 | [ Addc ⇒ rl_hsingleton RegisterCarry |
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117 | | Sub ⇒ rl_hsingleton RegisterCarry |
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118 | | _ ⇒ rl_bottom |
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119 | ]) |
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120 | (* acc_a and acc_b *) |
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121 | | OPACCS opaccs dr1 dr2 sr1 sr2 ⇒ |
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122 | rl_join (rl_arg sr1) (rl_arg sr2) |
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123 | | OP1 op1 r1 r2 ⇒ rl_psingleton r2 |
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124 | | LOAD acc_a dpl dph ⇒ rl_join (rl_arg dpl) (rl_arg dph) |
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125 | | STORE acc_a dpl dph ⇒ |
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126 | rl_join (rl_join (rl_arg acc_a) (rl_arg dpl)) (rl_arg dph) |
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127 | | PUSH r ⇒ rl_arg r |
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128 | | MOVE pair_reg ⇒ |
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129 | let r2 ≝ \snd pair_reg in |
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130 | match r2 with |
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131 | [ Reg p ⇒ |
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132 | match p with |
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133 | [ PSD r ⇒ rl_psingleton r |
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134 | | HDW r ⇒ rl_hsingleton r |
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135 | ] |
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136 | | Imm _ ⇒ rl_bottom |
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137 | ] |
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138 | | extension_seq ext ⇒ |
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139 | match ext with |
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140 | [ ertlptr_ertl ext' ⇒ |
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141 | match ext' with |
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142 | [ ertl_new_frame ⇒ rl_join (rl_hsingleton RegisterSPL) (rl_hsingleton RegisterSPH) |
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143 | | ertl_del_frame ⇒ rl_join (rl_hsingleton RegisterSPL) (rl_hsingleton RegisterSPH) |
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144 | | ertl_frame_size r ⇒ rl_bottom ] |
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145 | | LOW_ADDRESS r1 l ⇒ rl_bottom |
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146 | | HIGH_ADDRESS r1 l ⇒ rl_bottom |
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147 | ] |
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148 | (* Reads the hardware registers that are used to pass parameters. *) |
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149 | | _ ⇒ rl_bottom |
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150 | ] |
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151 | | COST_LABEL clabel ⇒ rl_bottom |
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152 | | CALL _ nparams _ ⇒ 〈set_empty …, set_from_list … (prefix ? nparams RegisterParams)〉 |
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153 | | COND r lbl_true ⇒ rl_psingleton r |
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154 | ] |
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155 | | final fin ⇒ |
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156 | match fin with |
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157 | [ RETURN ⇒ 〈set_empty …, set_union … (set_from_list … RegisterCalleeSaved) ret_regs〉 |
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158 | | GOTO l ⇒ rl_bottom |
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159 | | TAILCALL abs _ _ ⇒ match abs in False with [ ] |
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160 | ] |
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161 | | FCOND abs _ _ _ ⇒ Ⓧabs |
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162 | ]. |
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163 | |
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164 | definition eliminable ≝ |
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165 | λglobals: list ident. |
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166 | λl: register_lattice. |
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167 | λs: joint_statement ERTLptr globals. |
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168 | let pliveafter ≝ \fst l in |
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169 | let hliveafter ≝ \snd l in |
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170 | match s with |
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171 | [ sequential seq l ⇒ |
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172 | match seq with |
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173 | [ step_seq s ⇒ |
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174 | match s with |
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175 | [ OP2 op2 r1 r2 r3 ⇒ |
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176 | if match op2 with |
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177 | [ Add ⇒ set_member … eq_Register RegisterCarry hliveafter |
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178 | | Addc ⇒ set_member … eq_Register RegisterCarry hliveafter |
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179 | | Sub ⇒ set_member … eq_Register RegisterCarry hliveafter |
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180 | | _ ⇒ false |
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181 | ] ∨ set_member … (eq_identifier …) r1 pliveafter |
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182 | then |
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183 | None ? |
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184 | else |
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185 | Some ? l |
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186 | | OPACCS opaccs dr1 dr2 sr1 sr2 ⇒ |
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187 | if set_member … (eq_identifier …) dr1 pliveafter ∨ |
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188 | set_member … (eq_identifier …) dr2 pliveafter ∨ |
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189 | set_member … eq_Register RegisterCarry hliveafter then |
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190 | None ? |
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191 | else |
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192 | Some ? l |
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193 | | OP1 op1 r1 r2 ⇒ |
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194 | if set_member … (eq_identifier …) r1 pliveafter then |
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195 | None ? |
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196 | else |
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197 | Some ? l |
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198 | | ADDRESS _ _ r1 r2 ⇒ |
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199 | if set_member … (eq_identifier …) r1 pliveafter ∨ |
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200 | set_member … (eq_identifier …) r2 pliveafter then |
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201 | None ? |
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202 | else |
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203 | Some ? l |
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204 | | LOAD acc_a dpl dph ⇒ |
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205 | if set_member ? (eq_identifier …) acc_a pliveafter then |
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206 | None ? |
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207 | else |
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208 | Some ? l |
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209 | | MOVE pair_reg ⇒ |
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210 | if match \fst pair_reg with |
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211 | [ PSD p1 ⇒ |
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212 | set_member … (eq_identifier …) p1 pliveafter |
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213 | | HDW h1 ⇒ |
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214 | set_member … eq_Register h1 hliveafter |
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215 | ] then |
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216 | None ? |
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217 | else |
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218 | Some ? l |
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219 | | extension_seq ext ⇒ |
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220 | match ext with |
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221 | [ ertlptr_ertl ext' ⇒ |
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222 | match ext' with |
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223 | [ ertl_new_frame ⇒ None ? |
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224 | | ertl_del_frame ⇒ None ? |
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225 | | ertl_frame_size r ⇒ |
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226 | if set_member ? (eq_identifier RegisterTag) r pliveafter then |
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227 | None ? |
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228 | else |
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229 | Some ? l] |
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230 | | LOW_ADDRESS r1 l' ⇒ |
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231 | if set_member ? (eq_identifier RegisterTag) r1 pliveafter then |
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232 | None ? |
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233 | else |
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234 | Some ? l |
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235 | | HIGH_ADDRESS r1 l' ⇒ |
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236 | if set_member ? (eq_identifier RegisterTag) r1 pliveafter then |
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237 | None ? |
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238 | else |
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239 | Some ? l |
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240 | ] |
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241 | | _ ⇒ None ? |
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242 | ] |
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243 | | _ ⇒ None ? |
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244 | ] |
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245 | | _ ⇒ None ? |
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246 | ]. |
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247 | |
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248 | definition statement_semantics: ∀globals: list ident. |
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249 | joint_statement ERTLptr globals → register_lattice → register_lattice ≝ |
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250 | λglobals. |
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251 | λstmt. |
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252 | λliveafter. |
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253 | match eliminable globals liveafter stmt with |
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254 | [ None ⇒ rl_join (rl_diff liveafter (defined globals stmt)) (used globals stmt) |
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255 | | Some l ⇒ liveafter |
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256 | ]. |
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257 | |
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258 | definition livebefore ≝ |
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259 | λglobals: list ident. |
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260 | λint_fun: joint_internal_function ERTLptr globals. |
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261 | λlabel. |
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262 | λliveafter: valuation register_lattice. |
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263 | match lookup ?? (joint_if_code … int_fun) label with |
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264 | [ None ⇒ rl_bottom |
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265 | | Some stmt ⇒ statement_semantics globals stmt (liveafter label) |
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266 | ]. |
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267 | |
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268 | definition liveafter ≝ |
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269 | λglobals: list ident. |
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270 | λint_fun: joint_internal_function ERTLptr globals. |
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271 | λlabel. |
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272 | λliveafter: valuation register_lattice. |
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273 | match lookup ?? (joint_if_code … int_fun) label with |
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274 | [ None ⇒ rl_bottom |
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275 | | Some stmt ⇒ |
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276 | \fold[rl_join,rl_bottom]_{successor ∈ stmt_labels … stmt} |
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277 | (livebefore globals int_fun successor liveafter) |
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278 | ]. |
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279 | |
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280 | definition analyse_liveness ≝ |
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281 | λthe_fixpoint: fixpoint_computer. λglobals,int_fun. |
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282 | the_fixpoint ? (liveafter globals int_fun). |
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283 | |
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284 | definition vertex ≝ register + Register. |
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285 | |
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286 | definition plives : register → register_lattice → bool ≝ |
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287 | λvertex.λprop.set_member ? (eq_identifier RegisterTag) vertex (\fst prop). |
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288 | definition hlives : Register → register_lattice → bool ≝ |
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289 | λvertex.λprop.set_member ? eq_Register vertex (\snd prop). |
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290 | |
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291 | definition lives : vertex → register_lattice → bool ≝ |
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292 | λvertex. |
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293 | match vertex with |
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294 | [ inl v ⇒ plives v |
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295 | | inr v ⇒ hlives v |
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296 | ]. |
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