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(*===-- llvm_target.mli - LLVM OCaml Interface -----------------*- OCaml -*-===*
 *
 *                     The LLVM Compiler Infrastructure
 *
 * This file is distributed under the University of Illinois Open Source
 * License. See LICENSE.TXT for details.
 *
 *===----------------------------------------------------------------------===*)

(** Target Information.

    This interface provides an OCaml API for LLVM target information,
    the classes in the Target library. *)

module Endian : sig
  type t =
  | Big
  | Little
end

module CodeGenOptLevel : sig
  type t =
  | None
  | Less
  | Default
  | Aggressive
end

module RelocMode : sig
  type t =
  | Default
  | Static
  | PIC
  | DynamicNoPIC
end

module CodeModel : sig
  type t =
  | Default
  | JITDefault
  | Small
  | Kernel
  | Medium
  | Large
end

module CodeGenFileType : sig
  type t =
  | AssemblyFile
  | ObjectFile
end

(** {6 Exceptions} *)

exception Error of string

(** {6 Data Layout} *)

module DataLayout : sig
  type t

  (** [of_string rep] parses the data layout string representation [rep].
      See the constructor [llvm::DataLayout::DataLayout]. *)
  val of_string : string -> t

  (** [as_string dl] is the string representation of the data layout [dl].
      See the method [llvm::DataLayout::getStringRepresentation]. *)
  val as_string : t -> string

  (** [add_to_pass_manager dl pm] adds the target data [dl] to
      the pass manager [pm].
      See the method [llvm::PassManagerBase::add]. *)
  val add_to_pass_manager : [<Llvm.PassManager.any] Llvm.PassManager.t ->
                            t -> unit

  (** Returns the byte order of a target, either [Endian.Big] or
      [Endian.Little].
      See the method [llvm::DataLayout::isLittleEndian]. *)
  val byte_order : t -> Endian.t

  (** Returns the pointer size in bytes for a target.
      See the method [llvm::DataLayout::getPointerSize]. *)
  val pointer_size : t -> int

  (** Returns the integer type that is the same size as a pointer on a target.
      See the method [llvm::DataLayout::getIntPtrType]. *)
  val intptr_type : Llvm.llcontext -> t -> Llvm.lltype

  (** Returns the pointer size in bytes for a target in a given address space.
      See the method [llvm::DataLayout::getPointerSize]. *)
  val qualified_pointer_size : int -> t -> int

  (** Returns the integer type that is the same size as a pointer on a target
      in a given address space.
      See the method [llvm::DataLayout::getIntPtrType]. *)
  val qualified_intptr_type : Llvm.llcontext -> int -> t -> Llvm.lltype

  (** Computes the size of a type in bits for a target.
      See the method [llvm::DataLayout::getTypeSizeInBits]. *)
  val size_in_bits : Llvm.lltype -> t -> Int64.t

  (** Computes the storage size of a type in bytes for a target.
      See the method [llvm::DataLayout::getTypeStoreSize]. *)
  val store_size : Llvm.lltype -> t -> Int64.t

  (** Computes the ABI size of a type in bytes for a target.
      See the method [llvm::DataLayout::getTypeAllocSize]. *)
  val abi_size : Llvm.lltype -> t -> Int64.t

  (** Computes the ABI alignment of a type in bytes for a target.
      See the method [llvm::DataLayout::getTypeABISize]. *)
  val abi_align : Llvm.lltype -> t -> int

  (** Computes the call frame alignment of a type in bytes for a target.
      See the method [llvm::DataLayout::getTypeABISize]. *)
  val stack_align : Llvm.lltype -> t -> int

  (** Computes the preferred alignment of a type in bytes for a target.
      See the method [llvm::DataLayout::getTypeABISize]. *)
  val preferred_align : Llvm.lltype -> t -> int

  (** Computes the preferred alignment of a global variable in bytes for
      a target. See the method [llvm::DataLayout::getPreferredAlignment]. *)
  val preferred_align_of_global : Llvm.llvalue -> t -> int

  (** Computes the structure element that contains the byte offset for a target.
      See the method [llvm::StructLayout::getElementContainingOffset]. *)
  val element_at_offset : Llvm.lltype -> Int64.t -> t -> int

  (** Computes the byte offset of the indexed struct element for a target.
      See the method [llvm::StructLayout::getElementContainingOffset]. *)
  val offset_of_element : Llvm.lltype -> int -> t -> Int64.t
end

(** {6 Target} *)

module Target : sig
  type t

  (** [default_triple ()] returns the default target triple for current
      platform. *)
  val default_triple : unit -> string

  (** [first ()] returns the first target in the registered targets
      list, or [None]. *)
  val first : unit -> t option

  (** [succ t] returns the next target after [t], or [None]
      if [t] was the last target. *)
  val succ : t -> t option

  (** [all ()] returns a list of known targets. *)
  val all : unit -> t list

  (** [by_name name] returns [Some t] if a target [t] named [name] is
      registered, or [None] otherwise. *)
  val by_name : string -> t option

  (** [by_triple triple] returns a target for a triple [triple], or raises
      [Error] if [triple] does not correspond to a registered target. *)
  val by_triple : string -> t

  (** Returns the name of a target. See [llvm::Target::getName]. *)
  val name : t -> string

  (** Returns the description of a target.
      See [llvm::Target::getDescription]. *)
  val description : t -> string

  (** Returns [true] if the target has a JIT. *)
  val has_jit : t -> bool

  (** Returns [true] if the target has a target machine associated. *)
  val has_target_machine : t -> bool

  (** Returns [true] if the target has an ASM backend (required for
      emitting output). *)
  val has_asm_backend : t -> bool
end

(** {6 Target Machine} *)

module TargetMachine : sig
  type t

  (** Creates a new target machine.
      See [llvm::Target::createTargetMachine]. *)
  val create : triple:string -> ?cpu:string -> ?features:string ->
               ?level:CodeGenOptLevel.t -> ?reloc_mode:RelocMode.t ->
               ?code_model:CodeModel.t -> Target.t -> t

  (** Returns the Target used in a TargetMachine *)
  val target : t -> Target.t

  (** Returns the triple used while creating this target machine. See
      [llvm::TargetMachine::getTriple]. *)
  val triple : t -> string

  (** Returns the CPU used while creating this target machine. See
      [llvm::TargetMachine::getCPU]. *)
  val cpu : t -> string

  (** Returns the feature string used while creating this target machine. See
      [llvm::TargetMachine::getFeatureString]. *)
  val features : t -> string

  (** Returns the data layout of this target machine. *)
  val data_layout : t -> DataLayout.t

  (** Sets the assembly verbosity of this target machine.
      See [llvm::TargetMachine::setAsmVerbosity]. *)
  val set_verbose_asm : bool -> t -> unit

  (** Emits assembly or object data for the given module to the given
      file or raise [Error]. *)
  val emit_to_file : Llvm.llmodule -> CodeGenFileType.t -> string -> t -> unit

  (** Emits assembly or object data for the given module to a fresh memory
      buffer or raise [Error]. *)
  val emit_to_memory_buffer : Llvm.llmodule -> CodeGenFileType.t -> t ->
                              Llvm.llmemorybuffer
end