examples/OCaml-Kaleidoscope/Chapter4/toy.ml

   1 (*===----------------------------------------------------------------------===
   2  * Main driver code.
   3  *===----------------------------------------------------------------------===*)
   4
   5 open Llvm
   6 open Llvm_executionengine
   7 open Llvm_target
   8 open Llvm_scalar_opts
   9
  10 let main () =
  11   ignore (initialize_native_target ());
  12
  13   (* Install standard binary operators.
  14    * 1 is the lowest precedence. *)
  15   Hashtbl.add Parser.binop_precedence '<' 10;
  16   Hashtbl.add Parser.binop_precedence '+' 20;
  17   Hashtbl.add Parser.binop_precedence '-' 20;
  18   Hashtbl.add Parser.binop_precedence '*' 40;    (* highest. *)
  19
  20   (* Prime the first token. *)
  21   print_string "ready> "; flush stdout;
  22   let stream = Lexer.lex (Stream.of_channel stdin) in
  23
  24   (* Create the JIT. *)
  25   let the_execution_engine = ExecutionEngine.create Codegen.the_module in
  26   let the_fpm = PassManager.create_function Codegen.the_module in
  27
  28   (* Set up the optimizer pipeline.  Start with registering info about how the
  29    * target lays out data structures. *)
  30   DataLayout.add (ExecutionEngine.target_data the_execution_engine) the_fpm;
  31
  32   (* Do simple "peephole" optimizations and bit-twiddling optzn. *)
  33   add_instruction_combination the_fpm;
  34
  35   (* reassociate expressions. *)
  36   add_reassociation the_fpm;
  37
  38   (* Eliminate Common SubExpressions. *)
  39   add_gvn the_fpm;
  40
  41   (* Simplify the control flow graph (deleting unreachable blocks, etc). *)
  42   add_cfg_simplification the_fpm;
  43
  44   ignore (PassManager.initialize the_fpm);
  45
  46   (* Run the main "interpreter loop" now. *)
  47   Toplevel.main_loop the_fpm the_execution_engine stream;
  48
  49   (* Print out all the generated code. *)
  50   dump_module Codegen.the_module
  51 ;;
  52
  53 main ()