bindings/ocaml/executionengine/llvm_executionengine.mli

   1 (*===-- llvm_executionengine.mli - LLVM Ocaml Interface ---------*- C++ -*-===*
   2  *
   3  *                     The LLVM Compiler Infrastructure
   4  *
   5  * This file is distributed under the University of Illinois Open Source
   6  * License. See LICENSE.TXT for details.
   7  *
   8  *===----------------------------------------------------------------------===*)
   9
  10 (** JIT Interpreter.
  11
  12     This interface provides an ocaml API for LLVM execution engine (JIT/
  13     interpreter), the classes in the ExecutionEngine library. *)
  14
  15 exception Error of string
  16
  17 module GenericValue: sig
  18   (** [GenericValue.t] is a boxed union type used to portably pass arguments to
  19       and receive values from the execution engine. It supports only a limited
  20       selection of types; for more complex argument types, it is necessary to
  21       generate a stub function by hand or to pass parameters by reference.
  22       See the struct [llvm::GenericValue]. *)
  23   type t
  24
  25   (** [of_float fpty n] boxes the float [n] in a float-valued generic value
  26       according to the floating point type [fpty]. See the fields
  27       [llvm::GenericValue::DoubleVal] and [llvm::GenericValue::FloatVal]. *)
  28   val of_float : Llvm.lltype -> float -> t
  29
  30   (** [of_pointer v] boxes the pointer value [v] in a generic value. See the
  31       field [llvm::GenericValue::PointerVal]. *)
  32   val of_pointer : 'a -> t
  33
  34   (** [of_int32 n w] boxes the int32 [i] in a generic value with the bitwidth
  35       [w]. See the field [llvm::GenericValue::IntVal]. *)
  36   val of_int32 : Llvm.lltype -> int32 -> t
  37
  38   (** [of_int n w] boxes the int [i] in a generic value with the bitwidth
  39       [w]. See the field [llvm::GenericValue::IntVal]. *)
  40   val of_int : Llvm.lltype -> int -> t
  41
  42   (** [of_natint n w] boxes the native int [i] in a generic value with the
  43       bitwidth [w]. See the field [llvm::GenericValue::IntVal]. *)
  44   val of_nativeint : Llvm.lltype -> nativeint -> t
  45
  46
  47   (** [of_int64 n w] boxes the int64 [i] in a generic value with the bitwidth
  48       [w]. See the field [llvm::GenericValue::IntVal]. *)
  49   val of_int64 : Llvm.lltype -> int64 -> t
  50
  51   (** [as_float fpty gv] unboxes the floating point-valued generic value [gv] of
  52       floating point type [fpty]. See the fields [llvm::GenericValue::DoubleVal]
  53       and [llvm::GenericValue::FloatVal]. *)
  54   val as_float : Llvm.lltype -> t -> float
  55
  56   (** [as_pointer gv] unboxes the pointer-valued generic value [gv]. See the
  57       field [llvm::GenericValue::PointerVal]. *)
  58   val as_pointer : t -> 'a
  59
  60   (** [as_int32 gv] unboxes the integer-valued generic value [gv] as an [int32].
  61       Is invalid if [gv] has a bitwidth greater than 32 bits. See the field
  62       [llvm::GenericValue::IntVal]. *)
  63   val as_int32 : t -> int32
  64
  65   (** [as_int gv] unboxes the integer-valued generic value [gv] as an [int].
  66       Is invalid if [gv] has a bitwidth greater than the host bit width (but the
  67       most significant bit may be lost). See the field
  68       [llvm::GenericValue::IntVal]. *)
  69   val as_int : t -> int
  70
  71   (** [as_natint gv] unboxes the integer-valued generic value [gv] as a
  72       [nativeint]. Is invalid if [gv] has a bitwidth greater than
  73       [nativeint]. See the field [llvm::GenericValue::IntVal]. *)
  74   val as_nativeint : t -> nativeint
  75
  76   (** [as_int64 gv] returns the integer-valued generic value [gv] as an [int64].
  77       Is invalid if [gv] has a bitwidth greater than [int64]. See the field
  78       [llvm::GenericValue::IntVal]. *)
  79   val as_int64 : t -> int64
  80 end
  81
  82
  83 module ExecutionEngine: sig
  84   (** An execution engine is either a JIT compiler or an interpreter, capable of
  85       directly loading an LLVM module and executing its functions without first
  86       invoking a static compiler and generating a native executable. *)
  87   type t
  88
  89   (** [create m] creates a new execution engine, taking ownership of the
  90       module [m] if successful. Creates a JIT if possible, else falls back to an
  91       interpreter. Raises [Error msg] if an error occurrs. The execution engine
  92       is not garbage collected and must be destroyed with [dispose ee].
  93       See the function [llvm::EngineBuilder::create]. *)
  94   val create : Llvm.llmodule -> t
  95
  96   (** [create_interpreter m] creates a new interpreter, taking ownership of the
  97       module [m] if successful. Raises [Error msg] if an error occurrs. The
  98       execution engine is not garbage collected and must be destroyed with
  99       [dispose ee].
 100       See the function [llvm::EngineBuilder::create]. *)
 101   val create_interpreter : Llvm.llmodule -> t
 102
 103   (** [create_jit m optlevel] creates a new JIT (just-in-time compiler), taking
 104       ownership of the module [m] if successful with the desired optimization
 105       level [optlevel]. Raises [Error msg] if an error occurrs. The execution
 106       engine is not garbage collected and must be destroyed with [dispose ee].
 107       See the function [llvm::EngineBuilder::create]. *)
 108   val create_jit : Llvm.llmodule -> int -> t
 109
 110   (** [dispose ee] releases the memory used by the execution engine and must be
 111       invoked to avoid memory leaks. *)
 112   val dispose : t -> unit
 113
 114   (** [add_module m ee] adds the module [m] to the execution engine [ee]. *)
 115   val add_module : Llvm.llmodule -> t -> unit
 116
 117   (** [remove_module m ee] removes the module [m] from the execution engine
 118       [ee], disposing of [m] and the module referenced by [mp]. Raises
 119       [Error msg] if an error occurs. *)
 120   val remove_module : Llvm.llmodule -> t -> Llvm.llmodule
 121
 122
 123   (** [find_function n ee] finds the function named [n] defined in any of the
 124       modules owned by the execution engine [ee]. Returns [None] if the function
 125       is not found and [Some f] otherwise. *)
 126   val find_function : string -> t -> Llvm.llvalue option
 127
 128
 129   (** [run_function f args ee] synchronously executes the function [f] with the
 130       arguments [args], which must be compatible with the parameter types. *)
 131   val run_function : Llvm.llvalue -> GenericValue.t array -> t ->
 132                      GenericValue.t
 133
 134
 135   (** [run_static_ctors ee] executes the static constructors of each module in
 136       the execution engine [ee]. *)
 137   val run_static_ctors : t -> unit
 138
 139   (** [run_static_dtors ee] executes the static destructors of each module in
 140       the execution engine [ee]. *)
 141   val run_static_dtors : t -> unit
 142
 143   (** [run_function_as_main f args env ee] executes the function [f] as a main
 144       function, passing it [argv] and [argc] according to the string array
 145       [args], and [envp] as specified by the array [env]. Returns the integer
 146       return value of the function. *)
 147   val run_function_as_main : Llvm.llvalue -> string array ->
 148                                   (string * string) array -> t -> int
 149
 150
 151   (** [free_machine_code f ee] releases the memory in the execution engine [ee]
 152       used to store the machine code for the function [f]. *)
 153   val free_machine_code : Llvm.llvalue -> t -> unit
 154
 155
 156   (** [target_data ee] is the target data owned by the execution engine
 157       [ee]. *)
 158   val target_data : t -> Llvm_target.TargetData.t
 159
 160 end
 161
 162 val initialize_native_target : unit -> bool
 163