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annotate examples/OCaml-Kaleidoscope/Chapter4/toplevel.ml @ 0:95c75e76d11b

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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1 (*===----------------------------------------------------------------------===
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2 * Top-Level parsing and JIT Driver
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3 *===----------------------------------------------------------------------===*)
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4
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5 open Llvm
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6 open Llvm_executionengine
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7
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8 (* top ::= definition | external | expression | ';' *)
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9 let rec main_loop the_fpm the_execution_engine stream =
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10 match Stream.peek stream with
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11 | None -> ()
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12
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13 (* ignore top-level semicolons. *)
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14 | Some (Token.Kwd ';') ->
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15 Stream.junk stream;
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16 main_loop the_fpm the_execution_engine stream
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17
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18 | Some token ->
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19 begin
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20 try match token with
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21 | Token.Def ->
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22 let e = Parser.parse_definition stream in
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23 print_endline "parsed a function definition.";
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24 dump_value (Codegen.codegen_func the_fpm e);
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25 | Token.Extern ->
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26 let e = Parser.parse_extern stream in
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27 print_endline "parsed an extern.";
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28 dump_value (Codegen.codegen_proto e);
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29 | _ ->
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30 (* Evaluate a top-level expression into an anonymous function. *)
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31 let e = Parser.parse_toplevel stream in
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32 print_endline "parsed a top-level expr";
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33 let the_function = Codegen.codegen_func the_fpm e in
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34 dump_value the_function;
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35
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36 (* JIT the function, returning a function pointer. *)
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37 let result = ExecutionEngine.run_function the_function [||]
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38 the_execution_engine in
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39
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40 print_string "Evaluated to ";
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41 print_float (GenericValue.as_float Codegen.double_type result);
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42 print_newline ();
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43 with Stream.Error s | Codegen.Error s ->
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44 (* Skip token for error recovery. *)
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45 Stream.junk stream;
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46 print_endline s;
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47 end;
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48 print_string "ready> "; flush stdout;
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49 main_loop the_fpm the_execution_engine stream