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|
(* *********************************************************************)
(* *)
(* The Compcert verified compiler *)
(* *)
(* Xavier Leroy, INRIA Paris-Rocquencourt *)
(* *)
(* Copyright Institut National de Recherche en Informatique et en *)
(* Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU General Public License as published by *)
(* the Free Software Foundation, either version 2 of the License, or *)
(* (at your option) any later version. This file is also distributed *)
(* under the terms of the INRIA Non-Commercial License Agreement. *)
(* *)
(* *********************************************************************)
(* C abstract syntax after elaboration *)
(* Locations *)
type location = string * int (* filename, line number *)
(* Identifiers *)
type ident =
{ name: string; (* name as in the source *)
stamp: int } (* unique ID *)
(* Kinds of integers *)
type ikind =
| IBool (** [_Bool] *)
| IChar (** [char] *)
| ISChar (** [signed char] *)
| IUChar (** [unsigned char] *)
| IInt (** [int] *)
| IUInt (** [unsigned int] *)
| IShort (** [short] *)
| IUShort (** [unsigned short] *)
| ILong (** [long] *)
| IULong (** [unsigned long] *)
| ILongLong (** [long long] (or [_int64] on Microsoft Visual C) *)
| IULongLong (** [unsigned long long] (or [unsigned _int64] on Microsoft
Visual C) *)
(** Kinds of floating-point numbers*)
type fkind =
FFloat (** [float] *)
| FDouble (** [double] *)
| FLongDouble (** [long double] *)
(** Constants *)
type float_cst = {
hex : bool;
intPart : string;
fracPart : string;
exp : string;
}
type constant =
| CInt of int64 * ikind * string (* as it appeared in the source *)
| CFloat of float_cst * fkind
| CStr of string
| CWStr of int64 list
| CEnum of ident * int64 (* enum tag, integer value *)
(** Attributes *)
type attr_arg =
| AIdent of string
| AInt of int64
| AString of string
type attribute =
| AConst
| AVolatile
| ARestrict
| AAlignas of int (* always a power of 2 *)
| Attr of string * attr_arg list
type attributes = attribute list
(** Storage classes *)
type storage =
| Storage_default
| Storage_extern
| Storage_static
| Storage_register
(** Unary operators *)
type unary_operator =
| Ominus (* unary "-" *)
| Oplus (* unary "+" *)
| Olognot (* "!" *)
| Onot (* "~" *)
| Oderef (* unary "*" *)
| Oaddrof (* "&" *)
| Opreincr (* "++" prefix *)
| Opredecr (* "--" prefix *)
| Opostincr (* "++" postfix *)
| Opostdecr (* "--" postfix *)
| Odot of string (* ".field" *)
| Oarrow of string (* "->field" *)
type binary_operator =
| Oadd (* binary "+" *)
| Osub (* binary "-" *)
| Omul (* binary "*" *)
| Odiv (* "/" *)
| Omod (* "%" *)
| Oand (* "&" *)
| Oor (* "|" *)
| Oxor (* "^" *)
| Oshl (* "<<" *)
| Oshr (* ">>" *)
| Oeq (* "==" *)
| One (* "!=" *)
| Olt (* "<" *)
| Ogt (* ">" *)
| Ole (* "<=" *)
| Oge (* ">=" *)
| Oindex (* "a[i]" *)
| Oassign (* "=" *)
| Oadd_assign (* "+=" *)
| Osub_assign (* "-=" *)
| Omul_assign (* "*=" *)
| Odiv_assign (* "/=" *)
| Omod_assign (* "%=" *)
| Oand_assign (* "&=" *)
| Oor_assign (* "|=" *)
| Oxor_assign (* "^=" *)
| Oshl_assign (* "<<=" *)
| Oshr_assign (* ">>=" *)
| Ocomma (* "," *)
| Ologand (* "&&" *)
| Ologor (* "||" *)
(** Types *)
type typ =
| TVoid of attributes
| TInt of ikind * attributes
| TFloat of fkind * attributes
| TPtr of typ * attributes
| TArray of typ * int64 option * attributes
| TFun of typ * (ident * typ) list option * bool * attributes
| TNamed of ident * attributes
| TStruct of ident * attributes
| TUnion of ident * attributes
| TEnum of ident * attributes
(** Struct or union field *)
type field = {
fld_name: string;
fld_typ: typ;
fld_bitfield: int option
}
type struct_or_union =
| Struct
| Union
(** Expressions *)
type exp = { edesc: exp_desc; etyp: typ }
and exp_desc =
| EConst of constant
| ESizeof of typ
| EAlignof of typ
| EVar of ident
| EUnop of unary_operator * exp
| EBinop of binary_operator * exp * exp * typ
(* the type at which the operation is performed *)
| EConditional of exp * exp * exp
| ECast of typ * exp
| ECompound of typ * init
| ECall of exp * exp list
(** Initializers *)
and init =
| Init_single of exp
| Init_array of init list
| Init_struct of ident * (field * init) list
| Init_union of ident * field * init
(** Statements *)
type stmt = { sdesc: stmt_desc; sloc: location }
and stmt_desc =
| Sskip
| Sdo of exp
| Sseq of stmt * stmt
| Sif of exp * stmt * stmt
| Swhile of exp * stmt
| Sdowhile of stmt * exp
| Sfor of stmt * exp * stmt * stmt
| Sbreak
| Scontinue
| Sswitch of exp * stmt
| Slabeled of slabel * stmt
| Sgoto of string
| Sreturn of exp option
| Sblock of stmt list
| Sdecl of decl
| Sasm of string
and slabel =
| Slabel of string
| Scase of exp
| Sdefault
(** Declarations *)
and decl =
storage * ident * typ * init option
(** Function definitions *)
type fundef = {
fd_storage: storage;
fd_inline: bool;
fd_name: ident;
fd_attrib: attributes;
fd_ret: typ; (* return type *)
fd_params: (ident * typ) list; (* formal parameters *)
fd_vararg: bool; (* variable arguments? *)
fd_locals: decl list; (* local variables *)
fd_body: stmt
}
(** Element of an enumeration *)
type enumerator = ident * int64 * exp option
(** Global declarations *)
type globdecl =
{ gdesc: globdecl_desc; gloc: location }
and globdecl_desc =
| Gdecl of decl (* variable declaration, function prototype *)
| Gfundef of fundef (* function definition *)
| Gcompositedecl of struct_or_union * ident * attributes
(* struct/union declaration *)
| Gcompositedef of struct_or_union * ident * attributes * field list
(* struct/union definition *)
| Gtypedef of ident * typ (* typedef *)
| Genumdef of ident * attributes * enumerator list
(* enum definition *)
| Gpragma of string (* #pragma directive *)
type program = globdecl list
|
