1 | include "RTL/RTL.ma". |
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2 | |
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3 | definition simplify_stmt ≝ |
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4 | λglobals. |
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5 | λexit: label. |
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6 | λlbl: label. |
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7 | λstmt: rtl_statement globals. |
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8 | λgraph: codeT … (rtlntc_params globals). |
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9 | match stmt with |
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10 | [ sequential seq DUMMY ⇒ |
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11 | match seq with |
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12 | [ extension ext ⇒ |
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13 | match ext with |
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14 | [ rtl_st_ext_tailcall_id f args ⇒ |
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15 | add ? ? graph lbl (sequential … (CALL_ID … f args [ ]) exit) |
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16 | | rtl_st_ext_tailcall_ptr f1 f2 args ⇒ |
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17 | add ? ? graph lbl (sequential … (extension … (rtlntc_st_ext_call_ptr f1 f2 args [ ])) exit) |
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18 | | _ ⇒ graph ] |
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19 | | _ ⇒ graph ] |
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20 | | _ ⇒ graph ]. |
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21 | |
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22 | definition simplify_graph ≝ |
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23 | λglobals. |
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24 | λexit: label. |
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25 | λgraph: codeT … (rtl_params globals). |
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26 | foldi ? ? ? (simplify_stmt globals exit) graph (empty_map …). |
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27 | |
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28 | axiom simplify_graph_preserves_labels: |
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29 | ∀globals. |
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30 | ∀g: codeT … (rtl_params globals). |
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31 | ∀l: label. |
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32 | ∀exit: label. |
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33 | lookup ? ? g l ≠ None ? → lookup ? ? (simplify_graph globals exit g) l ≠ None ?. |
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34 | |
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35 | definition simplify_internal : |
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36 | ∀globals. |
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37 | joint_internal_function … (rtl_params globals) → |
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38 | joint_internal_function … (rtlntc_params globals) |
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39 | ≝ |
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40 | λglobals,def. |
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41 | let graph ≝ simplify_graph … (joint_if_exit … def) (joint_if_code … def) in |
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42 | mk_joint_internal_function … |
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43 | (joint_if_luniverse … def) (joint_if_runiverse … def) |
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44 | (joint_if_result … def) (joint_if_params … def) (joint_if_locals … def) |
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45 | (joint_if_stacksize … def) graph |
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46 | (pi1 … (joint_if_entry … def)) (pi1 … (joint_if_exit … def)). |
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47 | [ cases (joint_if_entry … def) | cases (joint_if_exit … def) ] |
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48 | #l #IH @simplify_graph_preserves_labels @IH |
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49 | qed. |
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50 | |
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51 | definition tailcall_simplify : rtl_program → rtlntc_program ≝ |
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52 | λp. transform_program … p (λvarnames. transf_fundef … (simplify_internal varnames)). |
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