50 lines
1.8 KiB
OCaml
50 lines
1.8 KiB
OCaml
(*===----------------------------------------------------------------------===
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* Top-Level parsing and JIT Driver
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*===----------------------------------------------------------------------===*)
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open Llvm
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open Llvm_executionengine
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(* top ::= definition | external | expression | ';' *)
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let rec main_loop the_fpm the_execution_engine stream =
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match Stream.peek stream with
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| None -> ()
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(* ignore top-level semicolons. *)
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| Some (Token.Kwd ';') ->
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Stream.junk stream;
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main_loop the_fpm the_execution_engine stream
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| Some token ->
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begin
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try match token with
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| Token.Def ->
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let e = Parser.parse_definition stream in
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print_endline "parsed a function definition.";
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dump_value (Codegen.codegen_func the_fpm e);
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| Token.Extern ->
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let e = Parser.parse_extern stream in
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print_endline "parsed an extern.";
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dump_value (Codegen.codegen_proto e);
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| _ ->
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(* Evaluate a top-level expression into an anonymous function. *)
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let e = Parser.parse_toplevel stream in
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print_endline "parsed a top-level expr";
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let the_function = Codegen.codegen_func the_fpm e in
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dump_value the_function;
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(* JIT the function, returning a function pointer. *)
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let result = ExecutionEngine.run_function the_function [||]
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the_execution_engine in
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print_string "Evaluated to ";
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print_float (GenericValue.as_float Codegen.double_type result);
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print_newline ();
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with Stream.Error s | Codegen.Error s ->
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(* Skip token for error recovery. *)
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Stream.junk stream;
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print_endline s;
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end;
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print_string "ready> "; flush stdout;
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main_loop the_fpm the_execution_engine stream
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