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author mir3636
date Wed, 06 Dec 2017 14:37:17 +0900
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1 (*===----------------------------------------------------------------------===
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2 * Code Generation
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3 *===----------------------------------------------------------------------===*)
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4
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5 open Llvm
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6
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7 exception Error of string
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8
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9 let context = global_context ()
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10 let the_module = create_module context "my cool jit"
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11 let builder = builder context
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12 let named_values:(string, llvalue) Hashtbl.t = Hashtbl.create 10
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13 let double_type = double_type context
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14
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15 let rec codegen_expr = function
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16 | Ast.Number n -> const_float double_type n
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17 | Ast.Variable name ->
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18 (try Hashtbl.find named_values name with
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19 | Not_found -> raise (Error "unknown variable name"))
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20 | Ast.Binary (op, lhs, rhs) ->
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21 let lhs_val = codegen_expr lhs in
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22 let rhs_val = codegen_expr rhs in
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23 begin
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24 match op with
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25 | '+' -> build_fadd lhs_val rhs_val "addtmp" builder
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26 | '-' -> build_fsub lhs_val rhs_val "subtmp" builder
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27 | '*' -> build_fmul lhs_val rhs_val "multmp" builder
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28 | '<' ->
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29 (* Convert bool 0/1 to double 0.0 or 1.0 *)
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30 let i = build_fcmp Fcmp.Ult lhs_val rhs_val "cmptmp" builder in
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31 build_uitofp i double_type "booltmp" builder
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32 | _ -> raise (Error "invalid binary operator")
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33 end
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34 | Ast.Call (callee, args) ->
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35 (* Look up the name in the module table. *)
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36 let callee =
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37 match lookup_function callee the_module with
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38 | Some callee -> callee
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39 | None -> raise (Error "unknown function referenced")
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40 in
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41 let params = params callee in
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42
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43 (* If argument mismatch error. *)
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44 if Array.length params == Array.length args then () else
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45 raise (Error "incorrect # arguments passed");
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46 let args = Array.map codegen_expr args in
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47 build_call callee args "calltmp" builder
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48
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49 let codegen_proto = function
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50 | Ast.Prototype (name, args) ->
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51 (* Make the function type: double(double,double) etc. *)
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52 let doubles = Array.make (Array.length args) double_type in
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53 let ft = function_type double_type doubles in
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54 let f =
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55 match lookup_function name the_module with
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56 | None -> declare_function name ft the_module
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57
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58 (* If 'f' conflicted, there was already something named 'name'. If it
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59 * has a body, don't allow redefinition or reextern. *)
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60 | Some f ->
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61 (* If 'f' already has a body, reject this. *)
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62 if block_begin f <> At_end f then
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63 raise (Error "redefinition of function");
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64
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65 (* If 'f' took a different number of arguments, reject. *)
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66 if element_type (type_of f) <> ft then
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67 raise (Error "redefinition of function with different # args");
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68 f
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69 in
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70
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71 (* Set names for all arguments. *)
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72 Array.iteri (fun i a ->
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73 let n = args.(i) in
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74 set_value_name n a;
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75 Hashtbl.add named_values n a;
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76 ) (params f);
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77 f
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78
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79 let codegen_func the_fpm = function
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80 | Ast.Function (proto, body) ->
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81 Hashtbl.clear named_values;
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82 let the_function = codegen_proto proto in
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83
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84 (* Create a new basic block to start insertion into. *)
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85 let bb = append_block context "entry" the_function in
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86 position_at_end bb builder;
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87
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88 try
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89 let ret_val = codegen_expr body in
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90
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91 (* Finish off the function. *)
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92 let _ = build_ret ret_val builder in
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93
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94 (* Validate the generated code, checking for consistency. *)
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95 Llvm_analysis.assert_valid_function the_function;
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96
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97 (* Optimize the function. *)
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98 let _ = PassManager.run_function the_function the_fpm in
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99
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100 the_function
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101 with e ->
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102 delete_function the_function;
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103 raise e