1 | |
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2 | include "compiler.ma". |
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3 | |
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4 | include "ASM/Interpret2.ma". |
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5 | |
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6 | include "Clight/Cexec.ma". |
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7 | |
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8 | include "Clight/labelSimulation.ma". |
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9 | |
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10 | theorem correct : |
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11 | ∀input_program. |
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12 | |
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13 | ∀object_code,costlabel_map,labelled,cost_map. |
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14 | compile input_program = OK ? 〈〈object_code,costlabel_map〉,❬labelled,cost_map❭〉 → |
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15 | |
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16 | not_wrong … (exec_inf … clight_fullexec input_program) → |
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17 | |
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18 | sim_with_labels (exec_inf … clight_fullexec input_program) (exec_inf … clight_fullexec labelled) |
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19 | ∧ |
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20 | True (* TODO *). |
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21 | |
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22 | #input_program |
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23 | #object_code #costlabel_map #labelled #cost_map |
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24 | #COMPILE |
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25 | #NOT_WRONG |
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26 | cases (bind_inversion ????? COMPILE) -COMPILE * * #init_cost #labelled' #rtlabs_program * #FRONTEND #COMPILE |
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27 | cases (bind_inversion ????? COMPILE) -COMPILE * #object_code' #costlabel_map' * #ASSEMBLER #COMPILE |
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28 | whd in COMPILE:(??%%); destruct |
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29 | cases (bind_inversion ????? FRONTEND) -FRONTEND #cminor_program * #CMINOR #FRONTEND |
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30 | whd in FRONTEND:(??%%); destruct |
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31 | |
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32 | % |
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33 | [ (* Needs switch removal too, now |
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34 | @labelling_sim @NOT_WRONG |
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35 | *) cases daemon |
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36 | | @I |
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37 | ] qed. |
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38 | |
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39 | |
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40 | include "Clight/Clight_abstract.ma". |
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41 | include "common/Measurable.ma". |
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42 | |
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43 | (* We could restrict this function to identifiers that are function names in the |
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44 | program and lift it (like the lift_cost_map_back_to_front function), but |
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45 | let's go with the easier notion of having a total map and ignore all the |
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46 | extra stuff. *) |
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47 | definition stack_cost_T ≝ ident → nat. |
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48 | |
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49 | axiom Clight_stack_cost : |
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50 | stack_cost_T → |
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51 | ∀s:Clight_state. |
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52 | match Clight_classify s with [ cl_call ⇒ True | cl_return ⇒ True | _ ⇒ False ] → |
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53 | nat. |
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54 | |
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55 | definition Clight_pcs : preclassified_system ≝ |
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56 | mk_preclassified_system |
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57 | clight_fullexec |
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58 | (λ_.Clight_labelled) |
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59 | (λ_.Clight_classify) |
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60 | (λf,g. Clight_stack_cost f). |
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61 | |
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62 | (* From measurable on Clight, we will end up with an RTLabs flat trace where |
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63 | we know that there are some m' and n' such that the prefix in Clight matches |
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64 | the prefix in RTLabs given by m', the next n steps in Clight are equivalent |
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65 | to the n' steps in RTLabs, and we have a suitable "will_return" for RTLabs |
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66 | for those n' steps so that we can build a corresponding structured trace. |
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67 | |
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68 | "Equivalent" here means, in particular, that the observables will be the same, |
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69 | and those observables will include the stack space costs. |
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70 | *) |
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71 | |
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72 | axiom observables_8051 : object_code → nat → nat → option ((list trace) × (list trace)). |
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73 | |
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74 | definition in_execution_prefix : execution_prefix Clight_state → costlabel → Prop ≝ |
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75 | λx,l. Exists … (λtrs. Exists … (λev. ev = EVcost l) (\fst trs)) x. |
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76 | |
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77 | let rec foldl_exists_aux (A,B:Type[0]) (l,l':list B) (f:A → ∀b:B. Exists … (λx.x=b) l → A) (a:A) on l' : (∀b. Exists … (λx.x=b) l' → Exists … (λx.x=b) l) → A ≝ |
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78 | match l' return λl'. (∀b. Exists … (λx.x=b) l' → Exists … (λx.x=b) l) → A with |
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79 | [ nil ⇒ λ_. a |
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80 | | cons h t ⇒ λH. foldl_exists_aux A B l t f (f a h (H …)) ? |
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81 | ]. |
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82 | [ %1 % |
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83 | | #b #H' @H %2 @H' |
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84 | ] qed. |
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85 | |
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86 | definition foldl_exists : ∀A,B:Type[0]. ∀l:list B. (A → ∀b:B. Exists … (λx. x = b ) l → A) → A → A ≝ |
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87 | λA,B,l,f,a. foldl_exists_aux A B l l f a (λb,H. H). |
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88 | |
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89 | lemma Exists_lift : ∀A,P,Q,l. |
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90 | (∀x. P x → Q x) → |
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91 | Exists A P l → |
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92 | Exists A Q l. |
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93 | #A #P #Q #l elim l |
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94 | [ // |
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95 | | #h #t #IH #H * [ #H' %1 @H @H' | #H' %2 @IH /2/ ] |
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96 | ] qed. |
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97 | |
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98 | definition measure_clock : ∀x:execution_prefix Clight_state. ((Σl:costlabel.in_execution_prefix x l)→ℕ) → nat ≝ |
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99 | λx,costmap. foldl_exists … x |
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100 | (λclock,trs,H. |
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101 | foldl_exists … (\fst trs) (λclock,ev. match ev return λev. Exists … (λx. x=ev) ? → nat with [ EVcost l ⇒ λH'. clock + costmap «l,?» | _ ⇒ λ_. clock ]) clock) |
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102 | 0. |
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103 | whd @(Exists_lift … H) * #tr1 #s1 #E destruct @(Exists_lift … H') #ev1 #E @E |
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104 | qed. |
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105 | |
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106 | definition clight_clock_after : ∀p:clight_program. nat → ((Σl:costlabel.in_clight_program p l)→ℕ) → option nat ≝ |
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107 | λp,n,costmap. |
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108 | let x ≝ exec_inf … clight_fullexec p in |
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109 | match split_trace … x n with |
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110 | [ Some traces ⇒ |
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111 | Some ? (measure_clock (\fst traces) (λl.costmap «l,?»)) |
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112 | | None ⇒ None ? |
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113 | ]. |
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114 | cases daemon |
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115 | qed. |
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116 | |
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117 | axiom initial_8051_status : ∀oc. Status oc. |
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118 | |
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119 | definition simulates ≝ |
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120 | λstack_cost : stack_cost_T. λ stack_bound, labelled, object_code, cost_map. |
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121 | let initial_status ≝ initial_8051_status (load_code_memory object_code) in |
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122 | ∀m1,m2. measurable Clight_pcs labelled m1 m2 stack_cost stack_bound → |
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123 | ∀c1,c2. clight_clock_after labelled m1 cost_map = Some ? c1 → clight_clock_after labelled m2 cost_map = Some ? c2 → |
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124 | ∃n1,n2. observables clight_fullexec labelled m1 m2 = observables_8051 object_code n1 n2 ∧ |
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125 | c2 - c1 = clock … (execute n2 ? initial_status) - clock … (execute n1 ? initial_status). |
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126 | |
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127 | axiom compile' : clight_program → res (object_code × costlabel_map × |
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128 | (𝚺labelled:clight_program. ((Σl:costlabel.in_clight_program labelled l)→ℕ)) × stack_cost_T × nat). |
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129 | |
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130 | theorem correct' : |
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131 | ∀input_program. |
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132 | |
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133 | not_wrong … (exec_inf … clight_fullexec input_program) → |
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134 | |
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135 | ∀object_code,costlabel_map,labelled,cost_map,stack_cost,stack_bound. |
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136 | compile' input_program = OK ? 〈〈〈object_code,costlabel_map〉,❬labelled,cost_map❭〉,stack_cost,stack_bound〉 → |
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137 | |
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138 | sim_with_labels (exec_inf … clight_fullexec input_program) (exec_inf … clight_fullexec labelled) |
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139 | ∧ |
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140 | |
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141 | simulates stack_cost stack_bound labelled object_code cost_map. |
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142 | |
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143 | |
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144 | |
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145 | (* start of old simulates |
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146 | |
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147 | (* [nth_state_of_with_stack state stack_cost stack_bound exec n] returns [Some s] iff after |
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148 | [n] steps of [exec] we have reached [s] without exceeding the [stack_bound] |
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149 | according to the [stack_cost] function. *) |
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150 | axiom nth_state_of_with_stack : ∀state. (state → nat) → nat → execution state io_out io_in → nat → option state. |
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151 | axiom nth_state_of : ∀state. execution state io_out io_in → nat → option state. |
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152 | |
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153 | |
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154 | let cl_trace ≝ exec_inf … clight_fullexec labelled in |
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155 | let asm_trace ≝ exec_inf … ASM_fullexec object_code in |
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156 | not_wrong ? cl_trace → |
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157 | ∀n,s. nth_state_of_with_stack ? stack_cost stack_bound cl_trace n = Some ? s → |
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158 | 𝚺m,s'. nth_state_of ? asm_trace m = Some ? s' ∧ s ≃ s' |
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159 | |
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160 | *) |
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161 | |
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162 | (* TODO |
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163 | |
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164 | |
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165 | ∀input_program. |
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166 | ! 〈object_code,costlabel_map,labelled,cost_map〉 ← compile input_program |
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167 | |
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168 | exec_inf … clight_fullexec input_program ≃l exec_inf … clight_fullexec labelled |
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169 | |
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170 | ∧ |
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171 | |
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172 | exec_inf … clight_fullexec labelled ≈ exec_inf … ASM_fullexec object_code |
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173 | (* Should we be lifting labels in some way here? *) |
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174 | |
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175 | ∧ |
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176 | |
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177 | ∀i,f : clight_status. |
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178 | Clight_labelled i → |
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179 | Clight_labelled f → |
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180 | ∀mx,time. |
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181 | let trace ≝ exec_inf_aux … clight_fullexec labelled i in |
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182 | will_return O O mx time f trace → |
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183 | mx < max_allowed_stack → |
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184 | ∃!i',f'. i ≃ i' ∧ f ≃ f' ∧ i' 8051~> f' ∧ |
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185 | time = clock f' - clock i'. |
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186 | |
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187 | |
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188 | ∀s,flat. |
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189 | let ge ≝ (globalenvs … labelled) in |
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190 | subtrace_of (exec_inf … RTLabs_fullexec labelled) flat → |
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191 | RTLabs_cost s = true → |
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192 | ∀WR : will_return ge 0 s flat. |
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193 | let structured_trace_rtlabs ≝ make_label_return' ge 0 s flat ??? WR in |
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194 | let labels_rtlabs ≝ flat_label_trace … flat WR in |
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195 | ∃!initial,final,structured_trace_asm. |
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196 | structured_trace_rtlabs ≈ structured_trace_asm ∧ |
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197 | clock … code_memory … final = clock … code_memory … initial + |
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198 | (Σ_{i < |labels_rtlabs|} (cost_map (match nth i labels_rtlabs with [ Some k ⇒ k | None ⇒ 0 ])). |
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199 | |
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200 | |
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201 | |
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202 | What is ≃l? Must show that "labelled" does everything that |
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203 | "input_program" does, without getting lost in some |
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204 | non-terminating loop part way. |
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205 | |
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206 | *) |
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207 | |
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