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https://github.com/c64scene-ar/llvm-6502.git
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58 lines
1.7 KiB
OCaml
58 lines
1.7 KiB
OCaml
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(*===----------------------------------------------------------------------===
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* Main driver code.
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*===----------------------------------------------------------------------===*)
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open Llvm
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open Llvm_executionengine
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open Llvm_target
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open Llvm_scalar_opts
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let main () =
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ignore (initialize_native_target ());
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(* Install standard binary operators.
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* 1 is the lowest precedence. *)
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Hashtbl.add Parser.binop_precedence '=' 2;
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Hashtbl.add Parser.binop_precedence '<' 10;
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Hashtbl.add Parser.binop_precedence '+' 20;
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Hashtbl.add Parser.binop_precedence '-' 20;
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Hashtbl.add Parser.binop_precedence '*' 40; (* highest. *)
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(* Prime the first token. *)
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print_string "ready> "; flush stdout;
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let stream = Lexer.lex (Stream.of_channel stdin) in
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(* Create the JIT. *)
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let the_execution_engine = ExecutionEngine.create Codegen.the_module in
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let the_fpm = PassManager.create_function Codegen.the_module in
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(* Set up the optimizer pipeline. Start with registering info about how the
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* target lays out data structures. *)
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TargetData.add (ExecutionEngine.target_data the_execution_engine) the_fpm;
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(* Promote allocas to registers. *)
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add_memory_to_register_promotion the_fpm;
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(* Do simple "peephole" optimizations and bit-twiddling optzn. *)
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add_instruction_combination the_fpm;
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(* reassociate expressions. *)
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add_reassociation the_fpm;
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(* Eliminate Common SubExpressions. *)
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add_gvn the_fpm;
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(* Simplify the control flow graph (deleting unreachable blocks, etc). *)
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add_cfg_simplification the_fpm;
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ignore (PassManager.initialize the_fpm);
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(* Run the main "interpreter loop" now. *)
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Toplevel.main_loop the_fpm the_execution_engine stream;
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(* Print out all the generated code. *)
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dump_module Codegen.the_module
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;;
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main ()
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