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   (** [of_int64 n w] boxes the int64 [i] in a generic value with the bitwidth
  47       [w]. See the field [llvm::GenericValue::IntVal]. *)
  48   val of_int64: Llvm.lltype -> int64 -> t
  49
  50   (** [as_float fpty gv] unboxes the floating point-valued generic value [gv] of
  51       floating point type [fpty]. See the fields [llvm::GenericValue::DoubleVal]
  52       and [llvm::GenericValue::FloatVal]. *)
  53   val as_float: Llvm.lltype -> t -> float
  54
  55   (** [as_pointer gv] unboxes the pointer-valued generic value [gv]. See the
  56       field [llvm::GenericValue::PointerVal]. *)
  57   val as_pointer: t -> 'a
  58
  59   (** [as_int32 gv] unboxes the integer-valued generic value [gv] as an [int32].
  60       Is invalid if [gv] has a bitwidth greater than 32 bits. See the field
  61       [llvm::GenericValue::IntVal]. *)
  62   val as_int32: t -> int32
  63
  64   (** [as_int gv] unboxes the integer-valued generic value [gv] as an [int].
  65       Is invalid if [gv] has a bitwidth greater than the host bit width (but the
  66       most significant bit may be lost). See the field
  67       [llvm::GenericValue::IntVal]. *)
  68   val as_int: t -> int
  69
  70   (** [as_natint gv] unboxes the integer-valued generic value [gv] as a
  71       [nativeint]. Is invalid if [gv] has a bitwidth greater than
  72       [nativeint]. See the field [llvm::GenericValue::IntVal]. *)
  73   val as_nativeint: t -> nativeint
  74
  75   (** [as_int64 gv] returns the integer-valued generic value [gv] as an [int64].
  76       Is invalid if [gv] has a bitwidth greater than [int64]. See the field
  77       [llvm::GenericValue::IntVal]. *)
  78   val as_int64: t -> int64
  79 end
  80
  81
  82 module ExecutionEngine: sig
  83   (** An execution engine is either a JIT compiler or an interpreter, capable of
  84       directly loading an LLVM module and executing its functions without first
  85       invoking a static compiler and generating a native executable. *)
  86   type t
  87
  88   (** [create mp] creates a new execution engine, taking ownership of the
  89       module provider [mp] if successful. Creates a JIT if possible, else falls
  90       back to an interpreter. Raises [Error msg] if an error occurrs. The
  91       execution engine is not garbage collected and must be destroyed with
  92       [dispose ee]. See the function [llvm::ExecutionEngine::create]. *)
  93   val create: Llvm.llmoduleprovider -> t
  94
  95   (** [create_interpreter mp] creates a new interpreter, taking ownership of the
  96       module provider [mp] if successful. Raises [Error msg] if an error
  97       occurrs. The execution engine is not garbage collected and must be
  98       destroyed with [dispose ee].
  99       See the function [llvm::ExecutionEngine::create]. *)
 100   val create_interpreter: Llvm.llmoduleprovider -> t
 101
 102   (** [create_jit mp] creates a new JIT (just-in-time compiler), taking
 103       ownership of the module provider [mp] if successful. This function creates
 104       a JIT which favors code quality over compilation speed. Raises [Error msg]
 105       if an error occurrs. The execution engine is not garbage collected and
 106       must be destroyed with [dispose ee].
 107       See the function [llvm::ExecutionEngine::create]. *)
 108   val create_jit: Llvm.llmoduleprovider -> t
 109
 110   (** [create_fast_jit mp] creates a new JIT (just-in-time compiler) which
 111       favors compilation speed over code quality. It takes ownership of the
 112       module provider [mp] if successful. Raises [Error msg] if an error
 113       occurrs. The execution engine is not garbage collected and must be
 114       destroyed with [dispose ee].
 115       See the function [llvm::ExecutionEngine::create]. *)
 116   val create_fast_jit: Llvm.llmoduleprovider -> t
 117
 118   (** [dispose ee] releases the memory used by the execution engine and must be
 119       invoked to avoid memory leaks. *)
 120   val dispose: t -> unit
 121
 122   (** [add_module_provider mp ee] adds the module provider [mp] to the execution
 123       engine [ee]. *)
 124   val add_module_provider: Llvm.llmoduleprovider -> t -> unit
 125
 126   (** [remove_module_provider mp ee] removes the module provider [mp] from the
 127       execution engine [ee], disposing of [mp] and the module referenced by
 128       [mp]. Raises [Error msg] if an error occurs. *)
 129   val remove_module_provider: Llvm.llmoduleprovider -> t -> Llvm.llmodule
 130
 131   (** [find_function n ee] finds the function named [n] defined in any of the
 132       modules owned by the execution engine [ee]. Returns [None] if the function
 133       is not found and [Some f] otherwise. *)
 134   val find_function: string -> t -> Llvm.llvalue option
 135
 136   (** [run_function f args ee] synchronously executes the function [f] with the
 137       arguments [args], which must be compatible with the parameter types. *)
 138   val run_function: Llvm.llvalue -> GenericValue.t array -> t ->
 139                     GenericValue.t
 140
 141   (** [run_static_ctors ee] executes the static constructors of each module in
 142       the execution engine [ee]. *)
 143   val run_static_ctors: t -> unit
 144
 145   (** [run_static_dtors ee] executes the static destructors of each module in
 146       the execution engine [ee]. *)
 147   val run_static_dtors: t -> unit
 148
 149   (** [run_function_as_main f args env ee] executes the function [f] as a main
 150       function, passing it [argv] and [argc] according to the string array
 151       [args], and [envp] as specified by the array [env]. Returns the integer
 152       return value of the function. *)
 153   val run_function_as_main: Llvm.llvalue -> string array ->
 154                             (string * string) array -> t -> int
 155
 156   (** [free_machine_code f ee] releases the memory in the execution engine [ee]
 157       used to store the machine code for the function [f]. *)
 158   val free_machine_code: Llvm.llvalue -> t -> unit
 159
 160   (** [target_data ee] is the target data owned by the execution engine
 161       [ee]. *)
 162   val target_data: t -> Llvm_target.TargetData.t
 163 end