(*===-- llvm_executionengine.mli - LLVM OCaml Interface -------*- OCaml -*-===*
*
* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
* See https://llvm.org/LICENSE.txt for license information.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*
*===----------------------------------------------------------------------===*)
(** JIT Interpreter.
This interface provides an OCaml API for LLVM execution engine (JIT/
interpreter), the classes in the [ExecutionEngine] library. *)
exception Error of string
(** [initialize ()] initializes the backend corresponding to the host.
Returns [true] if initialization is successful; [false] indicates
that there is no such backend or it is unable to emit object code
via MCJIT. *)
val initialize : unit -> bool
(** An execution engine is either a JIT compiler or an interpreter, capable of
directly loading an LLVM module and executing its functions without first
invoking a static compiler and generating a native executable. *)
type llexecutionengine
(** MCJIT compiler options. See [llvm::TargetOptions]. *)
type llcompileroptions = {
opt_level: int;
code_model: Llvm_target.CodeModel.t;
no_framepointer_elim: bool;
enable_fast_isel: bool;
}
(** Default MCJIT compiler options:
[{ opt_level = 0; code_model = CodeModel.JIT_default;
no_framepointer_elim = false; enable_fast_isel = false }] *)
val default_compiler_options : llcompileroptions
(** [create m optlevel] creates a new MCJIT just-in-time compiler, taking
ownership of the module [m] if successful with the desired optimization
level [optlevel]. Raises [Error msg] if an error occurrs. The execution
engine is not garbage collected and must be destroyed with [dispose ee].
Run {!initialize} before using this function.
See the function [llvm::EngineBuilder::create]. *)
val create : ?options:llcompileroptions -> Llvm.llmodule -> llexecutionengine
(** [dispose ee] releases the memory used by the execution engine and must be
invoked to avoid memory leaks. *)
val dispose : llexecutionengine -> unit
(** [add_module m ee] adds the module [m] to the execution engine [ee]. *)
val add_module : Llvm.llmodule -> llexecutionengine -> unit
(** [remove_module m ee] removes the module [m] from the execution engine
[ee]. Raises [Error msg] if an error occurs. *)
val remove_module : Llvm.llmodule -> llexecutionengine -> unit
(** [run_static_ctors ee] executes the static constructors of each module in
the execution engine [ee]. *)
val run_static_ctors : llexecutionengine -> unit
(** [run_static_dtors ee] executes the static destructors of each module in
the execution engine [ee]. *)
val run_static_dtors : llexecutionengine -> unit
(** [data_layout ee] is the data layout of the execution engine [ee]. *)
val data_layout : llexecutionengine -> Llvm_target.DataLayout.t
(** [add_global_mapping gv ptr ee] tells the execution engine [ee] that
the global [gv] is at the specified location [ptr], which must outlive
[gv] and [ee].
All uses of [gv] in the compiled code will refer to [ptr]. *)
val add_global_mapping : Llvm.llvalue -> 'a Ctypes.ptr -> llexecutionengine -> unit
(** [get_global_value_address id typ ee] returns a pointer to the
identifier [id] as type [typ], which will be a pointer type for a
value, and which will be live as long as [id] and [ee]
are. Caution: this function finalizes, i.e. forces code
generation, all loaded modules. Further modifications to the
modules will not have any effect. *)
val get_global_value_address : string -> 'a Ctypes.typ -> llexecutionengine -> 'a
(** [get_function_address fn typ ee] returns a pointer to the function
[fn] as type [typ], which will be a pointer type for a function
(e.g. [(int -> int) typ]), and which will be live as long as [fn]
and [ee] are. Caution: this function finalizes, i.e. forces code
generation, all loaded modules. Further modifications to the
modules will not have any effect. *)
val get_function_address : string -> 'a Ctypes.typ -> llexecutionengine -> 'a
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