1 | include "LTL/LTL.ma". |
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2 | include "ERTLptr/Interference.ma". |
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3 | include "ASM/Arithmetic.ma". |
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4 | include "joint/TranslateUtils.ma". |
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5 | |
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6 | (* Note: translation is complicated by having to preserve the carry bit and |
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7 | wanting to do it with as less boilerplate as possible. It could be somewhat |
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8 | simplified if constant and copy propagation was to be done after this pass: |
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9 | those optimisations would take care of the boilerplate for us.*) |
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10 | |
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11 | coercion Reg_to_dec : ∀r:Register.decision ≝ decision_colour on _r : Register to decision. |
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12 | |
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13 | inductive arg_decision : Type[0] ≝ |
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14 | | arg_decision_colour : Register → arg_decision |
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15 | | arg_decision_spill : ℕ → arg_decision |
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16 | | arg_decision_imm : Byte → arg_decision. |
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17 | |
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18 | coercion Reg_to_arg_dec : ∀r:Register.arg_decision ≝ arg_decision_colour on _r : Register to arg_decision. |
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19 | |
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20 | (* Paolo: I'm changing the following: before, spilled registers were |
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21 | assigned stack addresses going from SP + #frame_size - #stack_params |
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22 | excluded down to SP included. I am turning it upside down, so that |
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23 | the offset does not need the stack size to be computed *) |
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24 | |
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25 | check ltl_lin_seq |
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26 | definition preserve_carry_bit : |
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27 | (λglobals:list ident |
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28 | .λdo_it:bool |
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29 | .λsteps:step_block LTL globals |
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30 | .if do_it |
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31 | then 〈[λ_:code_point LTL.SAVE_CARRY]@ \fst (\fst steps), |
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32 | \snd (\fst steps), |
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33 | \snd steps@[RESTORE_CARRY]〉 |
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34 | else steps ). |
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35 | |
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36 | |
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37 | ∀globals.bool → step_block LTL globals → step_block LTL globals ≝ |
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38 | λglobals,do_it,steps. |
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39 | if do_it then |
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40 | 〈[?] @ (\fst(\fst steps)), |
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41 | \snd(\fst steps), |
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42 | (\snd steps) @ [RESTORE_CARRY]〉 |
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43 | else steps. |
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44 | #_ @SAVE_CARRY |
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45 | qed. |
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46 | check preserve_carry_bit |
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47 | |
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48 | (* for notation *) |
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49 | definition A ≝ it. |
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50 | |
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51 | coercion beval_of_byte : ∀b : Byte.beval ≝ BVByte on _b : Byte to beval. |
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52 | |
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53 | (* spill should be byte-based from the start *) |
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54 | definition set_dp_by_offset : |
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55 | ∀globals.nat → list (joint_seq LTL globals) ≝ |
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56 | λglobals,off. |
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57 | [ A ← byte_of_nat off |
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58 | ; A ← A .Add. RegisterSPL |
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59 | ; RegisterDPL ← A |
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60 | ; A ← zero_byte |
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61 | ; A ← A .Addc. RegisterSPH |
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62 | ; RegisterDPH ← A |
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63 | ]. |
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64 | |
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65 | definition get_stack: |
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66 | ∀globals.nat → Register → nat → list (joint_seq LTL globals) ≝ |
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67 | λglobals,localss,r,off. |
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68 | let off ≝ localss + off in |
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69 | set_dp_by_offset ? off @ |
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70 | [ LOAD … A it it ] @ |
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71 | if eq_Register r RegisterA then [ ] else [ r ← A ]. |
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72 | |
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73 | definition set_stack_not_a : |
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74 | ∀globals.nat → nat → Register → list (joint_seq LTL globals) ≝ |
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75 | λglobals,localss,off,r. |
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76 | let off ≝ localss + off in |
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77 | set_dp_by_offset ? off @ |
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78 | [ A ← r |
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79 | ; STORE … it it A ]. |
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80 | |
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81 | definition set_stack_a : |
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82 | ∀globals.nat → nat → list (joint_seq LTL globals) ≝ |
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83 | λglobals,localss,off. |
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84 | [ RegisterST1 ← A ] @ |
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85 | set_stack_not_a ? localss off RegisterST1. |
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86 | |
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87 | definition set_stack : |
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88 | ∀globals.nat → nat → Register → list (joint_seq LTL globals) ≝ |
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89 | λglobals,localss,off,r. |
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90 | if eq_Register r RegisterA then |
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91 | set_stack_a ? localss off |
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92 | else |
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93 | set_stack_not_a ? localss off r. |
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94 | |
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95 | definition set_stack_int : |
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96 | ∀globals.nat → nat → Byte → list (joint_seq LTL globals) ≝ |
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97 | λglobals,localss,off,int. |
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98 | let off ≝ localss + off in |
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99 | set_dp_by_offset ? off @ |
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100 | [ A ← int |
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101 | ; STORE … it it A ]. |
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102 | |
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103 | definition move : |
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104 | ∀globals.nat → bool → decision → arg_decision → list (joint_seq LTL globals) ≝ |
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105 | λglobals,localss,carry_lives_after,dst,src. |
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106 | match dst with |
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107 | [ decision_colour dstr ⇒ |
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108 | match src with |
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109 | [ arg_decision_colour srcr ⇒ |
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110 | if eq_Register dstr srcr then [ ] else |
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111 | if eq_Register dstr RegisterA then [ A ← srcr ] else |
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112 | if eq_Register srcr RegisterA then [ dstr ← A ] else |
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113 | [ A ← srcr ; dstr ← A] |
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114 | | arg_decision_spill srco ⇒ |
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115 | preserve_carry_bit ? carry_lives_after |
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116 | (get_stack ? localss dstr srco) |
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117 | | arg_decision_imm int ⇒ |
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118 | [ A ← int ] @ |
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119 | if eq_Register dstr RegisterA then [ ] else |
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120 | [ dstr ← A ] |
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121 | ] |
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122 | | decision_spill dsto ⇒ |
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123 | match src with |
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124 | [ arg_decision_colour srcr ⇒ |
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125 | preserve_carry_bit ? carry_lives_after |
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126 | (set_stack ? localss dsto srcr) |
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127 | | arg_decision_spill srco ⇒ |
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128 | if eqb srco dsto then [ ] else |
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129 | preserve_carry_bit ? carry_lives_after |
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130 | (get_stack ? localss RegisterA srco @ |
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131 | set_stack ? localss dsto RegisterA) |
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132 | | arg_decision_imm int ⇒ |
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133 | preserve_carry_bit ? carry_lives_after |
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134 | (set_stack_int ? localss dsto int) |
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135 | ] |
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136 | ]. |
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137 | |
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138 | definition arg_is_spilled : arg_decision → bool ≝ |
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139 | λx.match x with [ arg_decision_spill _ ⇒ true | _ ⇒ false ]. |
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140 | definition is_spilled : decision → bool ≝ |
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141 | λx.match x with [ decision_spill _ ⇒ true | _ ⇒ false ]. |
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142 | |
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143 | definition newframe : |
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144 | ∀globals.ℕ → list (joint_seq LTL globals) ≝ |
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145 | λglobals,stack_sz. |
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146 | [ CLEAR_CARRY … |
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147 | ; A ← RegisterSPL |
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148 | ; A ← A .Sub. byte_of_nat stack_sz |
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149 | ; RegisterSPL ← A |
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150 | ; A ← RegisterSPH |
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151 | ; A ← A .Sub. zero_byte |
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152 | ; RegisterSPH ← A |
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153 | ]. |
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154 | |
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155 | definition delframe : |
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156 | ∀globals.ℕ → list (joint_seq LTL globals) ≝ |
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157 | λglobals,stack_sz. |
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158 | [ A ← RegisterSPL |
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159 | ; A ← A .Add. byte_of_nat stack_sz |
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160 | ; RegisterSPL ← A |
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161 | ; A ← RegisterSPH |
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162 | ; A ← A .Addc. zero_byte |
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163 | ; RegisterSPH ← A |
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164 | ]. |
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165 | |
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166 | definition commutative : Op2 → bool ≝ |
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167 | λop.match op with |
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168 | [ Add ⇒ true |
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169 | | Addc ⇒ true |
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170 | | Or ⇒ true |
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171 | | Xor ⇒ true |
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172 | | And ⇒ true |
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173 | | _ ⇒ false |
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174 | ]. |
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175 | |
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176 | definition uses_carry : Op2 → bool ≝ |
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177 | λop.match op with |
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178 | [ Addc ⇒ true |
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179 | | Sub ⇒ true |
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180 | | _ ⇒ false |
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181 | ]. |
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182 | |
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183 | definition sets_carry : Op2 → bool ≝ |
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184 | λop.match op with |
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185 | [ Add ⇒ true |
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186 | | Addc ⇒ true |
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187 | | Sub ⇒ true |
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188 | | _ ⇒ false |
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189 | ]. |
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190 | |
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191 | definition translate_op2 : |
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192 | ∀globals.nat → bool→ Op2 → decision → arg_decision → arg_decision → list (joint_seq LTL globals) ≝ |
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193 | λglobals,localss,carry_lives_after,op,dst,arg1,arg2. |
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194 | (* this won't preserve the carry bit if op does not set it: left to next function *) |
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195 | (* if op uses carry bit (⇒ it sets it too) it must be preserved before the op *) |
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196 | (preserve_carry_bit ? |
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197 | (uses_carry op ∧ (arg_is_spilled arg1 ∨ arg_is_spilled arg2)) |
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198 | (move ? localss false RegisterB arg2 @ |
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199 | move ? localss false RegisterA arg1) @ |
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200 | [ A ← A .op. RegisterB ] @ |
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201 | (* it op sets the carry bit and it is needed afterwards it must be preserved here *) |
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202 | move ? localss (sets_carry op ∧ carry_lives_after) dst RegisterA). |
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203 | |
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204 | definition translate_op2_smart : |
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205 | ∀globals.nat → bool → Op2 → decision → arg_decision → arg_decision → list (joint_seq LTL globals) ≝ |
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206 | λglobals,localss,carry_lives_after,op,dst,arg1,arg2. |
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207 | (* if op does not set carry bit (⇒ it does not use it either) then it must be |
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208 | preserved *) |
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209 | preserve_carry_bit ? |
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210 | (¬sets_carry op ∧ carry_lives_after ∧ |
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211 | (arg_is_spilled arg1 ∨ arg_is_spilled arg2 ∨ is_spilled dst)) |
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212 | (match arg2 with |
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213 | [ arg_decision_colour arg2r ⇒ |
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214 | move ? localss (uses_carry op) RegisterA arg1 @ |
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215 | [ A ← A .op. arg2r ] @ |
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216 | move ? localss (sets_carry op ∧ carry_lives_after) dst RegisterA |
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217 | | arg_decision_imm arg2i ⇒ |
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218 | move ? localss (uses_carry op) RegisterA arg1 @ |
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219 | [ A ← A .op. arg2i ] @ |
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220 | move ? localss (sets_carry op ∧ carry_lives_after) dst RegisterA |
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221 | | _ ⇒ |
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222 | if commutative op then |
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223 | match arg1 with |
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224 | [ arg_decision_colour arg1r ⇒ |
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225 | move ? localss (uses_carry op) RegisterA arg2 @ |
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226 | [ A ← A .op. arg1r ] @ |
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227 | move ? localss (sets_carry op ∧ carry_lives_after) dst RegisterA |
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228 | | arg_decision_imm arg1i ⇒ |
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229 | move ? localss (uses_carry op) RegisterA arg2 @ |
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230 | [ A ← A .op. arg1i ] @ |
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231 | move ? localss (sets_carry op ∧ carry_lives_after) dst RegisterA |
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232 | | _ ⇒ |
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233 | translate_op2 ? localss carry_lives_after op dst arg1 arg2 |
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234 | ] |
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235 | else |
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236 | translate_op2 ? localss carry_lives_after op dst arg1 arg2 |
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237 | ]). |
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238 | |
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239 | definition dec_to_arg_dec : decision → arg_decision ≝ |
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240 | λd.match d with |
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241 | [ decision_colour r ⇒ arg_decision_colour r |
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242 | | decision_spill n ⇒ arg_decision_spill n |
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243 | ]. |
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244 | |
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245 | coercion dec_arg_dec : ∀d:decision.arg_decision ≝ dec_to_arg_dec on _d : decision to arg_decision. |
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246 | |
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247 | definition translate_op1 : |
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248 | ∀globals.nat → bool → Op1 → decision → decision → list (joint_seq LTL globals) ≝ |
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249 | λglobals,localss,carry_lives_after,op,dst,arg. |
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250 | let preserve_carry ≝ carry_lives_after ∧ (is_spilled dst ∨ is_spilled arg) in |
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251 | preserve_carry_bit ? preserve_carry |
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252 | (move ? localss false RegisterA arg @ |
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253 | OP1 … op it it :: |
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254 | move ? localss false dst RegisterA). |
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255 | |
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256 | definition translate_opaccs : |
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257 | ∀globals.nat → bool → OpAccs → decision → decision → arg_decision → arg_decision → list (joint_seq LTL globals) ≝ |
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258 | λglobals,localss,carry_lives_after,op,dst1,dst2,arg1,arg2. |
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259 | (* OPACCS always has dead carry bit and sets it to zero *) |
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260 | move ? localss false RegisterB arg2 @ |
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261 | move ? localss false RegisterA arg1 @ |
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262 | OPACCS … op it it it it :: |
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263 | move ? localss false dst1 RegisterA @ |
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264 | move ? localss false dst2 RegisterB @ |
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265 | if carry_lives_after ∧ (is_spilled dst1 ∨ is_spilled dst2) then |
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266 | [CLEAR_CARRY ??] |
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267 | else [ ]. |
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268 | |
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269 | (* does not preserve carry bit *) |
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270 | definition move_to_dp : |
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271 | ∀globals.nat → arg_decision → arg_decision → list (joint_seq LTL globals) ≝ |
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272 | λglobals,localss,arg1,arg2. |
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273 | if ¬arg_is_spilled arg1 then |
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274 | move ? localss false RegisterDPH arg2 @ |
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275 | (* does not change dph because arg1 is not spilled *) |
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276 | move ? localss false RegisterDPL arg1 |
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277 | else if ¬arg_is_spilled arg2 then |
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278 | move ? localss false RegisterDPL arg1 @ |
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279 | (* does not change dpl because arg2 is not spilled *) |
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280 | move ? localss false RegisterDPH arg2 |
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281 | else |
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282 | (* using B as temporary, as moving spilled registers tampers with DPTR *) |
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283 | move ? localss false RegisterB arg1 @ |
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284 | move ? localss false RegisterDPH arg2 @ |
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285 | move ? localss false RegisterDPL RegisterB. |
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286 | |
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287 | definition translate_store : |
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288 | ∀globals.nat → bool → arg_decision → arg_decision → arg_decision → list (joint_seq LTL globals) ≝ |
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289 | λglobals,localss,carry_lives_after,addr1,addr2,src. |
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290 | (* requires src != RegisterA and RegisterB *) |
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291 | preserve_carry_bit ? (carry_lives_after ∧ |
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292 | (arg_is_spilled addr1 ∨ arg_is_spilled addr1 ∨ arg_is_spilled src)) |
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293 | (let move_to_dptr ≝ move_to_dp ? localss addr1 addr2 in |
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294 | (if arg_is_spilled src then |
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295 | move ? localss false RegisterST0 src @ |
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296 | move_to_dptr @ |
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297 | [ A ← RegisterST0] |
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298 | else move_to_dptr) @ |
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299 | [STORE … it it A]). |
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300 | |
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301 | definition translate_load : |
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302 | ∀globals.nat → bool → decision → arg_decision → arg_decision → list (joint_seq LTL globals) ≝ |
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303 | λglobals,localss,carry_lives_after,dst,addr1,addr2. |
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304 | preserve_carry_bit ? (carry_lives_after ∧ |
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305 | (is_spilled dst ∨ arg_is_spilled addr1 ∨ arg_is_spilled addr1)) |
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306 | (move_to_dp ? localss addr1 addr2 @ |
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307 | [ LOAD … A it it ] @ |
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308 | move ? localss false dst RegisterA). |
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309 | |
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310 | definition translate_address : |
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311 | ∀globals.nat → bool → ∀i.i ∈ globals → decision → decision → |
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312 | list (joint_seq LTL globals) ≝ |
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313 | λglobals,localss,carry_lives_after,id,prf,addr1,addr2. |
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314 | preserve_carry_bit ? (carry_lives_after ∧ (is_spilled addr1 ∨ is_spilled addr2)) |
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315 | (ADDRESS LTL ? id prf it it :: |
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316 | move ? localss false addr1 RegisterDPL @ |
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317 | move ? localss false addr2 RegisterDPH). |
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318 | |
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319 | definition translate_low_address : |
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320 | ∀globals.nat → bool → decision → label → |
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321 | list (joint_seq LTL globals) ≝ |
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322 | λglobals,localss,carry_lives_after,dst,lbl. |
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323 | match dst return λ_.list (joint_seq LTL globals) with |
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324 | [ decision_colour r ⇒ [LOW_ADDRESS r lbl] |
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325 | | _ ⇒ |
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326 | LOW_ADDRESS RegisterA lbl :: move ? localss carry_lives_after dst RegisterA |
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327 | ]. |
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328 | |
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329 | definition translate_high_address : |
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330 | ∀globals.nat → bool → decision → label → |
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331 | list (joint_seq LTL globals) ≝ |
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332 | λglobals,localss,carry_lives_after,dst,lbl. |
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333 | match dst return λ_.list (joint_seq LTL globals) with |
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334 | [ decision_colour r ⇒ [HIGH_ADDRESS r lbl] |
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335 | | _ ⇒ |
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336 | HIGH_ADDRESS RegisterA lbl :: move ? localss carry_lives_after dst RegisterA |
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337 | ]. |
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338 | |
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339 | definition translate_step: |
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340 | ∀globals.nat → ∀after : valuation register_lattice. |
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341 | coloured_graph after → |
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342 | ℕ → label → joint_step ERTLptr globals → bind_step_block LTL globals ≝ |
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343 | λglobals,localss,after,grph,stack_sz,lbl,s. |
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344 | bret … ( |
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345 | let lookup ≝ λr.colouring … grph (inl … r) in |
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346 | let lookup_arg ≝ λa.match a with |
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347 | [ Reg r ⇒ lookup r |
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348 | | Imm b ⇒ arg_decision_imm b |
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349 | ] in |
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350 | let carry_lives_after ≝ hlives RegisterCarry (after lbl) in |
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351 | let move ≝ move globals localss carry_lives_after in |
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352 | match s with |
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353 | [ step_seq s' ⇒ |
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354 | match s' return λ_.step_block LTL globals with |
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355 | [ COMMENT c ⇒ [COMMENT … c] |
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356 | | POP r ⇒ |
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357 | POP … A :: |
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358 | move (lookup r) RegisterA |
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359 | | PUSH a ⇒ |
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360 | move RegisterA (lookup_arg a) @ |
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361 | [ PUSH … A ] |
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362 | | STORE addr1 addr2 srcr ⇒ |
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363 | translate_store ? localss carry_lives_after |
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364 | (lookup_arg addr1) |
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365 | (lookup_arg addr2) |
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366 | (lookup_arg srcr) |
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367 | | LOAD dstr addr1 addr2 ⇒ |
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368 | translate_load ? localss carry_lives_after |
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369 | (lookup dstr) |
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370 | (lookup_arg addr1) |
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371 | (lookup_arg addr2) |
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372 | | CLEAR_CARRY ⇒ [CLEAR_CARRY ??] |
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373 | | SET_CARRY ⇒ [SET_CARRY ??] |
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374 | | OP2 op dst arg1 arg2 ⇒ |
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375 | translate_op2_smart ? localss carry_lives_after op |
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376 | (lookup dst) |
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377 | (lookup_arg arg1) |
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378 | (lookup_arg arg2) |
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379 | | OP1 op dst arg ⇒ |
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380 | translate_op1 ? localss carry_lives_after op |
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381 | (lookup dst) |
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382 | (lookup arg) |
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383 | | MOVE pair_regs ⇒ |
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384 | let lookup_move_dst ≝ λx.match x return λ_.decision with |
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385 | [ PSD r ⇒ lookup r |
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386 | | HDW r ⇒ r |
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387 | ] in |
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388 | let dst ≝ lookup_move_dst (\fst pair_regs) in |
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389 | let src ≝ |
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390 | match \snd pair_regs return λ_.arg_decision with |
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391 | [ Reg r ⇒ lookup_move_dst r |
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392 | | Imm b ⇒ arg_decision_imm b |
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393 | ] in |
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394 | move dst src |
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395 | | ADDRESS lbl prf dpl dph ⇒ |
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396 | translate_address ? localss carry_lives_after |
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397 | lbl prf (lookup dpl) (lookup dph) |
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398 | | OPACCS op dst1 dst2 arg1 arg2 ⇒ |
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399 | translate_opaccs ? localss carry_lives_after op |
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400 | (lookup dst1) (lookup dst2) |
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401 | (lookup_arg arg1) (lookup_arg arg2) |
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402 | | extension_seq ext ⇒ |
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403 | match ext with |
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404 | [ ertlptr_ertl ext' ⇒ |
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405 | match ext' with |
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406 | [ ertl_new_frame ⇒ newframe ? stack_sz |
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407 | | ertl_del_frame ⇒ delframe ? stack_sz |
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408 | | ertl_frame_size r ⇒ |
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409 | move (lookup r) (arg_decision_imm (byte_of_nat stack_sz)) |
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410 | ] |
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411 | | LOW_ADDRESS r1 l ⇒ |
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412 | translate_low_address ? localss carry_lives_after (lookup r1) l |
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413 | | HIGH_ADDRESS r1 l ⇒ |
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414 | translate_high_address ? localss carry_lives_after (lookup r1) l |
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415 | ] |
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416 | ] |
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417 | | COST_LABEL cost_lbl ⇒ 〈[ ], λ_.COST_LABEL … cost_lbl, [ ]〉 |
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418 | | COND r ltrue ⇒ |
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419 | 〈add_dummy_variance … (move RegisterA (lookup r)),λ_.COND … it ltrue, [ ]〉 |
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420 | | CALL f n_args _ ⇒ |
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421 | match f with |
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422 | [ inl f ⇒ |
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423 | 〈[ ],λ_.CALL LTL ? (inl … f) n_args it, [ ]〉 |
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424 | | inr dp ⇒ |
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425 | let 〈dpl, dph〉 ≝ dp in |
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426 | 〈add_dummy_variance … (move_to_dp ? localss (lookup_arg dpl) (lookup_arg dph)), |
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427 | λ_.CALL LTL ? (inr … 〈it, it〉) n_args it, [ ]〉 |
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428 | ] |
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429 | ]). |
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430 | |
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431 | definition translate_fin_step: |
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432 | ∀globals.label → joint_fin_step ERTLptr → bind_fin_block LTL globals ≝ |
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433 | λglobals,lbl,s. |
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434 | bret … (〈[ ], |
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435 | match s with |
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436 | [ RETURN ⇒ RETURN ? |
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437 | | GOTO l ⇒ GOTO ? l |
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438 | | TAILCALL abs _ _ ⇒ Ⓧabs |
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439 | ]〉). |
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440 | |
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441 | definition translate_data : |
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442 | fixpoint_computer → coloured_graph_computer → |
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443 | ∀globals. |
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444 | joint_closed_internal_function ERTLptr globals → |
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445 | bind_new register (b_graph_translate_data ERTLptr LTL globals) ≝ |
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446 | λthe_fixpoint,build,globals,int_fun. |
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447 | (* colour registers *) |
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448 | let after ≝ analyse_liveness the_fixpoint globals int_fun in |
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449 | let coloured_graph ≝ build … int_fun after in |
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450 | (* compute new stack size *) |
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451 | let stack_sz ≝ spilled_no … coloured_graph + joint_if_stacksize … int_fun in |
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452 | bret … |
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453 | (mk_b_graph_translate_data ERTLptr LTL globals |
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454 | (* init_ret ≝ *) it |
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455 | (* init_params ≝ *) it |
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456 | (* init_stack_size ≝ *) stack_sz |
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457 | (* added_prologue ≝ *) [ ] |
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458 | (* new_regs ≝ *) [ ] |
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459 | (* f_step ≝ *) (translate_step ? (joint_if_local_stacksize ?? int_fun) … coloured_graph stack_sz) |
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460 | (* f_fin ≝ *) (translate_fin_step globals) |
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461 | ????). |
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462 | @hide_prf |
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463 | [ |
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464 | | #l #c % ] |
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465 | cases daemon (* TODO *) |
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466 | qed. |
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467 | |
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468 | (* Paolo: does it really have sense to do here the first stack address computation, |
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469 | when it is an info easily available from any program in the back end? |
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470 | Also, is it really 2^16 - |globals|, or should there also be a -1? *) |
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471 | definition ertlptr_to_ltl: |
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472 | fixpoint_computer → coloured_graph_computer → ertlptr_program → |
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473 | ltl_program × stack_cost_model × nat ≝ |
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474 | λthe_fixpoint,build,pr. |
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475 | let ltlprog ≝ b_graph_transform_program … (translate_data the_fixpoint build) pr in |
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476 | 〈ltlprog, stack_cost … ltlprog, 2^16 - globals_stacksize … ltlprog〉. |
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477 | % |
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478 | qed. |
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