1 | |
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2 | (* Replace initialisation of global variables with equivalent Cminor code. *) |
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3 | |
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4 | include "Cminor/syntax.ma". |
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5 | include "common/Globalenvs.ma". |
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6 | |
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7 | definition init_expr : init_data → option (memory_chunk × expr) ≝ |
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8 | λinit. |
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9 | match init with |
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10 | [ Init_int8 i ⇒ Some ? 〈Mint8unsigned, Cst (Ointconst i)〉 |
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11 | | Init_int16 i ⇒ Some ? 〈Mint16unsigned, Cst (Ointconst i)〉 |
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12 | | Init_int32 i ⇒ Some ? 〈Mint32, Cst (Ointconst i)〉 |
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13 | | Init_float32 f ⇒ Some ? 〈Mfloat32, Cst (Ofloatconst f)〉 |
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14 | | Init_float64 f ⇒ Some ? 〈Mfloat64, Cst (Ofloatconst f)〉 |
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15 | | Init_space n ⇒ None ? |
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16 | | Init_null r ⇒ Some ? 〈Mpointer r, Op1 (Optrofint r) (Cst (Ointconst zero))〉 |
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17 | | Init_addrof r id off ⇒ Some ? 〈Mpointer r, Cst (Oaddrsymbol id off)〉 |
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18 | ]. |
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19 | |
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20 | (* Produces a few extra skips - hopefully the compiler will optimise these |
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21 | away. *) |
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22 | |
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23 | definition init_datum : ident → init_data → int (*offset?*) → stmt ≝ |
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24 | λid,init,off. |
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25 | match init_expr init with |
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26 | [ None ⇒ St_skip |
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27 | | Some x ⇒ |
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28 | let 〈chunk, e〉 ≝ x in |
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29 | St_store chunk (Cst (Oaddrsymbol id off)) e |
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30 | ]. |
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31 | |
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32 | definition init_var : ident → list init_data → stmt ≝ |
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33 | λid,init. |
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34 | \snd (foldr ?? |
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35 | (λdatum,os. |
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36 | let 〈off,s〉 ≝ os in |
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37 | 〈addition_n ? off (repr (size_init_data datum)), St_seq (init_datum id datum off) s〉) |
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38 | 〈zero, St_skip〉 init). |
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39 | |
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40 | definition init_vars : list (ident × (list init_data) × region × unit) → stmt ≝ |
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41 | λvars. foldr ?? |
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42 | (λvar,s. St_seq s (init_var (\fst (\fst (\fst var))) (\snd (\fst (\fst var))))) St_skip vars. |
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43 | |
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44 | definition add_statement : ident → stmt → |
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45 | list (ident × (fundef internal_function)) → |
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46 | list (ident × (fundef internal_function)) ≝ |
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47 | λid,s. |
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48 | map ?? |
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49 | (λidf. |
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50 | let 〈id',f'〉 ≝ idf in |
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51 | match ident_eq id id' with |
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52 | [ inl _ ⇒ |
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53 | match f' with |
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54 | [ Internal f ⇒ 〈id, Internal ? (mk_internal_function |
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55 | (f_sig f) |
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56 | (f_params f) |
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57 | (f_vars f) |
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58 | (f_ptrs f) |
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59 | (f_stacksize f) |
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60 | (St_seq s (f_body f)))〉 |
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61 | | External f ⇒ 〈id, External ? f〉 (* Error ? *) |
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62 | ] |
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63 | | inr _ ⇒ 〈id',f'〉 ]). |
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64 | |
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65 | definition empty_vars : list (ident × (list init_data) × region × unit) → |
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66 | list (ident × (list init_data) × region × unit) ≝ |
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67 | map ?? (λv. 〈〈〈\fst (\fst (\fst v)), |
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68 | [Init_space (size_init_data_list (\snd (\fst (\fst v))))]〉, |
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69 | \snd (\fst v)〉, |
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70 | \snd v〉). |
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71 | |
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72 | definition replace_init : Cminor_program → Cminor_program ≝ |
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73 | λp. |
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74 | mk_program ?? |
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75 | (add_statement (prog_main ?? p) (init_vars (prog_vars ?? p)) (prog_funct ?? p)) |
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76 | (prog_main ?? p) |
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77 | (empty_vars (prog_vars ?? p)). |
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78 | |
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