source: src/compiler.ma @ 2700

Last change on this file since 2700 was 2700, checked in by sacerdot, 7 years ago
  1. exponential function dropped in favour of standard library
  2. fixpoint computation and graph colouring abstracted in the back-end, axiomatized in the compiler
  3. minor speedups in Policy.ma
File size: 3.3 KB
Line 
1include "Clight/label.ma".
2include "Clight/SimplifyCasts.ma".
3include "Clight/switchRemoval.ma".
4include "Clight/toCminor.ma".
5include "Cminor/initialisation.ma".
6include "Cminor/toRTLabs.ma".
7
8definition front_end : clight_program → res (costlabel × clight_program × RTLabs_program) ≝
9λp.
10  let p ≝ program_switch_removal p in
11  let 〈p',init_cost〉 ≝ clight_label p in
12  let p ≝ simplify_program p' in
13  ! p ← clight_to_cminor p;
14  let p ≝ cminor_to_rtlabs init_cost p in
15  return 〈init_cost,p',p〉.
16
17include "RTLabs/RTLabsToRTL.ma".
18include "RTL/RTLToERTL.ma".
19include "ERTL/ERTLToERTLptr.ma".
20include "ERTLptr/ERTLptrToLTL.ma".
21(*
22include "LTL/LTLToLIN.ma".
23include "LIN/LINToASM.ma".
24*) include "ASM/ASM.ma". include "LIN/LIN.ma".
25   axiom ltl_to_lin: ltl_program → lin_program.
26   axiom lin_to_asm: lin_program → pseudo_assembly_program.
27
28axiom compute_fixpoint : fixpoint_computer.
29axiom colour_graph : coloured_graph_computer.
30
31definition back_end : RTLabs_program → pseudo_assembly_program ≝
32λp.
33  let p ≝ rtlabs_to_rtl p in
34  let p ≝ rtl_to_ertl p in
35  let p ≝ ertl_to_ertlptr p in
36  let p ≝ ertlptr_to_ltl compute_fixpoint colour_graph p in (* TODO: abstract over colouring *)
37  let p ≝ ltl_to_lin p in
38          lin_to_asm p.
39
40(* JHM: minimum needed for assembler axiom to typecheck *)
41(* JHM: moved from ASMCostsSplit.ma                     *)
42(* JHM: should move elsewhere in ASM/                   *)
43definition object_code ≝ list Byte.
44definition costlabel_map ≝ BitVectorTrie costlabel 16.
45
46axiom assembler : pseudo_assembly_program → res (object_code × costlabel_map).
47
48(* Only sloow include "ASM/Policy.ma".
49*)include "ASM/PolicyStep.ma". include "arithmetics/nat.ma". axiom jump_expansion': ∀program:preamble × (Σl:list labelled_instruction.S (|l|) < 2^16 ∧ is_well_labelled_p l).
50 option (Σsigma_policy:(Word → Word) × (Word → bool).
51   let 〈sigma,policy〉≝ sigma_policy in
52   sigma_policy_specification 〈\fst program,\snd program〉 sigma policy).
53
54definition assembler : pseudo_assembly_program → res (object_code × costlabel_map) ≝
55λp.
56  let 〈preamble, list_instr〉 ≝ p in
57  (* TODO: fail if p is too large. *)
58  let p' ≝ 〈preamble, list_instr〉 in
59  ! sigma_pol ← opt_to_res ? (msg Jump_expansion_failed) (jump_expansion' p');
60  let sigma ≝ λppc. \fst (sigma_pol ppc) in
61  let pol ≝ λppc. \snd (sigma_pol ppc) in
62  OK ? (assembly p sigma pol).
63cases daemon
64qed.
65
66include "ASM/ASMCosts.ma".
67
68definition lift_cost_map_back_to_front :
69  ∀clight, code_memory, lbls.
70    let abstat ≝ ASM_abstract_status code_memory lbls in
71   (∀l. (as_cost_labelled abstat l) + ¬(as_cost_labelled abstat l)) →
72  as_cost_map abstat → clight_cost_map clight ≝
73  λclight,code_memory,lbls,dec,k,asm_cost_map.
74  lift_sigma_map_id … 0 (* labels not present in out code get 0 *)
75    dec k asm_cost_map.
76
77include "ASM/ASMCostsSplit.ma".
78
79definition compile : clight_program →
80  res (object_code × costlabel_map × (𝚺labelled:clight_program. clight_cost_map labelled)) ≝
81λp.
82  ! 〈init_cost,p',p〉 ← front_end p;
83  let p ≝ back_end p in
84    ! p ← assembler p;
85  let k ≝ ASM_cost_map p ? in
86  let k' ≝ lift_cost_map_back_to_front
87    p'
88    (load_code_memory (\fst p))
89    (\snd p)
90    ? k
91    in
92  return 〈p, ❬p', k'❭〉.
93  cases daemon
94  qed.
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