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67 lines
2.0 KiB
67 lines
2.0 KiB
8 years ago
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(*
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* Copyright (c) 2009 - 2013 Monoidics ltd.
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* Copyright (c) 2013 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*)
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(** The Smallfoot Intermediate Language: Binary Operators *)
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open! IStd
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module L = Logging
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module F = Format
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(** Binary operations *)
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type t =
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| PlusA (** arithmetic + *)
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| PlusPI (** pointer + integer *)
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| MinusA (** arithmetic - *)
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| MinusPI (** pointer - integer *)
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| MinusPP (** pointer - pointer *)
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| Mult (** * *)
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| Div (** / *)
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| Mod (** % *)
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| Shiftlt (** shift left *)
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| Shiftrt (** shift right *)
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| Lt (** < (arithmetic comparison) *)
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| Gt (** > (arithmetic comparison) *)
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| Le (** <= (arithmetic comparison) *)
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| Ge (** >= (arithmetic comparison) *)
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| Eq (** == (arithmetic comparison) *)
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| Ne (** != (arithmetic comparison) *)
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| BAnd (** bitwise and *)
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| BXor (** exclusive-or *)
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| BOr (** inclusive-or *)
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| LAnd (** logical and. Does not always evaluate both operands. *)
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| LOr (** logical or. Does not always evaluate both operands. *)
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[@@deriving compare]
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val equal : t -> t -> bool
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(** This function returns true if the operation is injective
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wrt. each argument: op(e,-) and op(-, e) is injective for all e.
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The return value false means "don't know". *)
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val injective : t -> bool
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(** This function returns true if the operation can be inverted. *)
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val invertible : t -> bool
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(** This function inverts an invertible injective binary operator.
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If the [binop] operation is not invertible, the function raises Assert_failure. *)
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val invert : t -> t
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(** This function returns true if 0 is the right unit of [binop].
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The return value false means "don't know". *)
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val is_zero_runit : t -> bool
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(** String representation of a binary operator. *)
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val str : Pp.env -> t -> string
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