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 '=' 2; 16 Hashtbl.add Parser.binop_precedence '<' 10; 17 Hashtbl.add Parser.binop_precedence '+' 20; 18 Hashtbl.add Parser.binop_precedence '-' 20; 19 Hashtbl.add Parser.binop_precedence '*' 40; (* highest. *) 20 21 (* Prime the first token. *) 22 print_string "ready> "; flush stdout; 23 let stream = Lexer.lex (Stream.of_channel stdin) in 24 25 (* Create the JIT. *) 26 let the_execution_engine = ExecutionEngine.create Codegen.the_module in 27 let the_fpm = PassManager.create_function Codegen.the_module in 28 29 (* Set up the optimizer pipeline. Start with registering info about how the 30 * target lays out data structures. *) 31 TargetData.add (ExecutionEngine.target_data the_execution_engine) the_fpm; 32 33 (* Promote allocas to registers. *) 34 add_memory_to_register_promotion the_fpm; 35 36 (* Do simple "peephole" optimizations and bit-twiddling optzn. *) 37 add_instruction_combination the_fpm; 38 39 (* reassociate expressions. *) 40 add_reassociation the_fpm; 41 42 (* Eliminate Common SubExpressions. *) 43 add_gvn the_fpm; 44 45 (* Simplify the control flow graph (deleting unreachable blocks, etc). *) 46 add_cfg_simplification the_fpm; 47 48 ignore (PassManager.initialize the_fpm); 49 50 (* Run the main "interpreter loop" now. *) 51 Toplevel.main_loop the_fpm the_execution_engine stream; 52 53 (* Print out all the generated code. *) 54 dump_module Codegen.the_module 55 ;; 56 57 main () 58
