package frama-c

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package frama-c
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CIL main API.

CIL original API documentation is available as an html version at http://manju.cs.berkeley.edu/cil.

val initCIL : initLogicBuiltins:(unit -> unit) -> Cil_types.mach -> unit

Call this function to perform some initialization, and only after you have set Cil.msvcMode. initLogicBuiltins is the function to call to init logic builtins. The Machdeps argument is a description of the hardware platform and of the compiler used.

Customization

type theMachine = private {
  1. mutable useLogicalOperators : bool;
    (*

    Whether to use the logical operands LAnd and LOr. By default, do not use them because they are unlike other expressions and do not evaluate both of their operands

    *)
  2. mutable theMachine : Cil_types.mach;
  3. mutable lowerConstants : bool;
    (*

    Do lower constants (default true)

    *)
  4. mutable insertImplicitCasts : bool;
    (*

    Do insert implicit casts (default true)

    *)
  5. mutable stringLiteralType : Cil_types.typ;
  6. mutable upointKind : Cil_types.ikind;
    (*

    An unsigned integer type that fits pointers.

    *)
  7. mutable upointType : Cil_types.typ;
  8. mutable wcharKind : Cil_types.ikind;
    (*

    An integer type that fits wchar_t.

    *)
  9. mutable wcharType : Cil_types.typ;
  10. mutable ptrdiffKind : Cil_types.ikind;
    (*

    An integer type that fits ptrdiff_t.

    *)
  11. mutable ptrdiffType : Cil_types.typ;
  12. mutable typeOfSizeOf : Cil_types.typ;
    (*

    An integer type that is the type of sizeof.

    *)
  13. mutable kindOfSizeOf : Cil_types.ikind;
    (*

    The integer kind of Cil.theMachine.typeOfSizeOf.

    *)
}
val theMachine : theMachine

Current machine description

val selfMachine : State.t
val selfMachine_is_computed : ?project:Project.project -> unit -> bool

whether current project has set its machine description.

val msvcMode : unit -> bool
val gccMode : unit -> bool
val set_acceptEmptyCompinfo : unit -> unit

After a call to this function, empty compinfos are allowed by the kernel, this must be used as a configuration step equivalent to a machdep, except that it is not a user configuration.

Note that if the selected machdep is GCC or MSVC, this call has no effect as these modes already allow empty compinfos.

  • since 23.0-Vanadium
val acceptEmptyCompinfo : unit -> bool

whether we accept empty struct. Implied by Cil.msvcMode and Cil.gccMode, and can be forced by Cil.set_acceptEmptyCompinfo otherwise.

  • since 23.0-Vanadium
val allowed_machdep : string -> string

allowed_machdep "machdep family" provides a standard message for features only allowed for a particular machdep.

  • since 25.0-Manganese

Values for manipulating globals

val emptyFunctionFromVI : Cil_types.varinfo -> Cil_types.fundec

Make an empty function from an existing global varinfo.

  • since Nitrogen-20111001
val emptyFunction : string -> Cil_types.fundec

Make an empty function

val setFormals : Cil_types.fundec -> Cil_types.varinfo list -> unit

Update the formals of a fundec and make sure that the function type has the same information. Will copy the name as well into the type.

val getReturnType : Cil_types.typ -> Cil_types.typ

Takes as input a function type (or a typename on it) and return its return type.

val setReturnTypeVI : Cil_types.varinfo -> Cil_types.typ -> unit

Change the return type of the function passed as 1st argument to be the type passed as 2nd argument.

val setReturnType : Cil_types.fundec -> Cil_types.typ -> unit
val setFunctionType : Cil_types.fundec -> Cil_types.typ -> unit

Set the types of arguments and results as given by the function type * passed as the second argument. Will not copy the names from the function * type to the formals

val setFunctionTypeMakeFormals : Cil_types.fundec -> Cil_types.typ -> unit

Set the type of the function and make formal arguments for them

val setMaxId : Cil_types.fundec -> unit

Update the smaxid after you have populated with locals and formals * (unless you constructed those using Cil.makeLocalVar or * Cil.makeTempVar.

val selfFormalsDecl : State.t

state of the table associating formals to each prototype.

val makeFormalsVarDecl : ?ghost:bool -> (string * Cil_types.typ * Cil_types.attributes) -> Cil_types.varinfo

creates a new varinfo for the parameter of a prototype. By default, this formal variable is not ghost.

val setFormalsDecl : Cil_types.varinfo -> Cil_types.typ -> unit

Update the formals of a function declaration from its identifier and its type. For a function definition, use Cil.setFormals. Do nothing if the type is not a function type or if the list of argument is empty.

val removeFormalsDecl : Cil_types.varinfo -> unit

remove a binding from the table.

  • since Oxygen-20120901
val unsafeSetFormalsDecl : Cil_types.varinfo -> Cil_types.varinfo list -> unit

replace formals of a function declaration with the given list of varinfo.

val iterFormalsDecl : (Cil_types.varinfo -> Cil_types.varinfo list -> unit) -> unit

iterate the given function on declared prototypes.

  • since Oxygen-20120901
val getFormalsDecl : Cil_types.varinfo -> Cil_types.varinfo list

Get the formals of a function declaration registered with Cil.setFormalsDecl.

  • raises Not_found

    if the function is not registered (this is in particular the case for prototypes with an empty list of arguments. See Cil.setFormalsDecl)

val dummyFile : Cil_types.file

A dummy file

val iterGlobals : Cil_types.file -> (Cil_types.global -> unit) -> unit

Iterate over all globals, including the global initializer

val foldGlobals : Cil_types.file -> ('a -> Cil_types.global -> 'a) -> 'a -> 'a

Fold over all globals, including the global initializer

val mapGlobals : Cil_types.file -> (Cil_types.global -> Cil_types.global) -> unit

Map over all globals, including the global initializer and change things in place

val findOrCreateFunc : Cil_types.file -> string -> Cil_types.typ -> Cil_types.varinfo

Find a function or function prototype with the given name in the file. * If it does not exist, create a prototype with the given type, and return * the new varinfo. This is useful when you need to call a libc function * whose prototype may or may not already exist in the file. * * Because the new prototype is added to the start of the file, you shouldn't * refer to any struct or union types in the function type.

creates an expression with a fresh id

val copy_exp : Cil_types.exp -> Cil_types.exp

performs a deep copy of an expression (especially, avoid eid sharing).

  • since Nitrogen-20111001

creates an expression with a dummy id. Use with caution, i.e. not on expressions that may be put in the AST.

val is_case_label : Cil_types.label -> bool

Return true on case and default labels, false otherwise.

val pushGlobal : Cil_types.global -> types:Cil_types.global list ref -> variables:Cil_types.global list ref -> unit

CIL keeps the types at the beginning of the file and the variables at the * end of the file. This function will take a global and add it to the * corresponding stack. Its operation is actually more complicated because if * the global declares a type that contains references to variables (e.g. in * sizeof in an array length) then it will also add declarations for the * variables to the types stack

val invalidStmt : Cil_types.stmt

An empty statement. Used in pretty printing

Returns a location that ranges over the two locations in arguments.

Values for manipulating initializers

val makeZeroInit : loc:Cil_types.location -> Cil_types.typ -> Cil_types.init

Make a initializer for zero-ing a data type

val foldLeftCompound : implicit:bool -> doinit:(Cil_types.offset -> Cil_types.init -> Cil_types.typ -> 'a -> 'a) -> ct:Cil_types.typ -> initl:(Cil_types.offset * Cil_types.init) list -> acc:'a -> 'a

Fold over the list of initializers in a Compound (not also the nested * ones). doinit is called on every present initializer, even if it is of * compound type. The parameters of doinit are: the offset in the compound * (this is Field(f,NoOffset) or Index(i,NoOffset)), the initializer * value, expected type of the initializer value, accumulator. In the case of * arrays there might be missing zero-initializers at the end of the list. * These are scanned only if implicit is true. This is much like * List.fold_left except we also pass the type of the initializer.

* This is a good way to use it to scan even nested initializers :

  let rec myInit (lv: lval) (i: init) (acc: 'a) : 'a =
    match i with
      | SingleInit e -> (* ... do something with [lv] and [e] and [acc] ... *)
      | CompoundInit (ct, initl) ->
         foldLeftCompound ~implicit:false
           ~doinit:(fun off' i' _typ acc' ->
                      myInit (addOffsetLval off' lv) i' acc')
           ~ct
           ~initl
           ~acc

Values for manipulating types

val voidType : Cil_types.typ

void

val isVoidType : Cil_types.typ -> bool

is the given type "void"?

val isVoidPtrType : Cil_types.typ -> bool

is the given type "void *"?

val intType : Cil_types.typ

int

val uintType : Cil_types.typ

unsigned int

val shortType : Cil_types.typ

short

val ushortType : Cil_types.typ

unsigned short

val longType : Cil_types.typ

long

val longLongType : Cil_types.typ

long long

val ulongType : Cil_types.typ

unsigned long

val ulongLongType : Cil_types.typ

unsigned long long

val int16_t : unit -> Cil_types.typ

Any signed integer type of size 16 bits. It is equivalent to the ISO C int16_t type but without using the corresponding header. Must only be called if such type exists in the current architecture.

  • since 23.0-Vanadium
val int32_t : unit -> Cil_types.typ

Any signed integer type of size 32 bits. It is equivalent to the ISO C int32_t type but without using the corresponding header. Must only be called if such type exists in the current architecture.

  • since 23.0-Vanadium
val int64_t : unit -> Cil_types.typ

Any signed integer type of size 64 bits. It is equivalent to the ISO C int64_t type but without using the corresponding header. Must only be called if such type exists in the current architecture.

  • since 23.0-Vanadium
val uint16_t : unit -> Cil_types.typ

Any unsigned integer type of size 16 bits. It is equivalent to the ISO C uint16_t type but without using the corresponding header. Must only be called if such type exists in the current architecture.

  • since Nitrogen-20111001
val uint32_t : unit -> Cil_types.typ

Any unsigned integer type of size 32 bits. It is equivalent to the ISO C uint32_t type but without using the corresponding header. Must only be called if such type exists in the current architecture.

  • since Nitrogen-20111001
val uint64_t : unit -> Cil_types.typ

Any unsigned integer type of size 64 bits. It is equivalent to the ISO C uint64_t type but without using the corresponding header. Must only be called if such type exists in the current architecture.

  • since Nitrogen-20111001
val charType : Cil_types.typ

char

val scharType : Cil_types.typ
val ucharType : Cil_types.typ
val charPtrType : Cil_types.typ

char *

val scharPtrType : Cil_types.typ
val ucharPtrType : Cil_types.typ
val charConstPtrType : Cil_types.typ

char const *

val voidPtrType : Cil_types.typ

void *

val voidConstPtrType : Cil_types.typ

void const *

val intPtrType : Cil_types.typ

int *

val uintPtrType : Cil_types.typ

unsigned int *

val floatType : Cil_types.typ

float

val doubleType : Cil_types.typ

double

val longDoubleType : Cil_types.typ

long double

val isSignedInteger : Cil_types.typ -> bool
  • returns

    true if and only if the given type is a signed integer type.

val isUnsignedInteger : Cil_types.typ -> bool
  • returns

    true if and only if the given type is an unsigned integer type.

  • since Oxygen-20120901
val missingFieldName : string

This is a constant used as the name of an unnamed bitfield. These fields do not participate in initialization and their name is not printed.

val compFullName : Cil_types.compinfo -> string

Get the full name of a comp, including the 'struct' or 'union' prefix

val isCompleteType : ?allowZeroSizeArrays:bool -> Cil_types.typ -> bool

Returns true if this is a complete type. This means that sizeof(t) makes sense. Incomplete types are not yet defined structures and empty arrays.

  • parameter allowZeroSizeArrays

    indicates whether arrays of size 0 (a gcc extension) are considered as complete. Default value depends on the current machdep.

val lvalue_conversion : Cil_types.typ -> (Cil_types.typ, string) result

Performs lvalue-conversion on the type and returns the converted type, or Error if the type is incomplete and not an array type.

  • since 27.0-Cobalt
val is_variably_modified_type : Cil_types.typ -> bool

true iff the given type is variably modified, i.e., an array with variable size (VLA), or a composite type containing such an array.

val has_flexible_array_member : Cil_types.typ -> bool

true iff the given type is a struct whose last field is a flexible array member. When in gcc mode, a zero-sized array is identified with a FAM for this purpose.

  • since 18.0-Argon

true iff the given type has flexible array member, in GCC/MSVC mode, this function mode recursively searches in the type of the last field.

  • before 24.0-Chromium

    this function didn't take in account the GCC/MSVC mode

val unrollType : Cil_types.typ -> Cil_types.typ

Unroll a type until it exposes a non * TNamed. Will collect all attributes appearing in TNamed!!!

val unrollTypeDeep : Cil_types.typ -> Cil_types.typ

Unroll all the TNamed in a type (even under type constructors such as * TPtr, TFun or TArray. Does not unroll the types of fields in TComp * types. Will collect all attributes

val separateStorageModifiers : Cil_types.attribute list -> Cil_types.attribute list * Cil_types.attribute list

Separate out the storage-modifier name attributes

val arithmeticConversion : Cil_types.typ -> Cil_types.typ -> Cil_types.typ

returns the type of the result of an arithmetic operator applied to values of the corresponding input types.

  • since Nitrogen-20111001 (moved from Cabs2cil)
val integralPromotion : Cil_types.typ -> Cil_types.typ

performs the usual integral promotions mentioned in C reference manual.

  • since Nitrogen-20111001 (moved from Cabs2cil)
val isAnyCharType : Cil_types.typ -> bool

True if the argument is a character type (i.e. plain, signed or unsigned)

  • since Chlorine-20180501
val isCharType : Cil_types.typ -> bool

True if the argument is a plain character type (but neither signed char nor unsigned char).

val isShortType : Cil_types.typ -> bool

True if the argument is a short type (i.e. signed or unsigned)

val isAnyCharPtrType : Cil_types.typ -> bool

True if the argument is a pointer to a character type (i.e. plain, signed or unsigned).

  • since Chlorine-20180501
val isCharPtrType : Cil_types.typ -> bool

True if the argument is a pointer to a plain character type (but neither signed char nor unsigned char).

val isCharConstPtrType : Cil_types.typ -> bool

True if the argument is a pointer to a constant character type, e.g. a string literal.

  • since Chlorine-20180501
val isAnyCharArrayType : Cil_types.typ -> bool

True if the argument is an array of a character type (i.e. plain, signed or unsigned)

  • since Chlorine-20180501
val isCharArrayType : Cil_types.typ -> bool

True if the argument is an array of a character type (i.e. plain, signed or unsigned)

val isIntegralType : Cil_types.typ -> bool

True if the argument is an integral type (i.e. integer or enum)

val isBoolType : Cil_types.typ -> bool

True if the argument is _Bool

  • since 19.0-Potassium
val isLogicPureBooleanType : Cil_types.logic_type -> bool

True if the argument is _Bool or boolean.

  • since 19.0-Potassium
val isIntegralOrPointerType : Cil_types.typ -> bool

True if the argument is an integral or pointer type.

val isLogicIntegralType : Cil_types.logic_type -> bool

True if the argument is an integral type (i.e. integer or enum), either C or mathematical one.

val isLogicBooleanType : Cil_types.logic_type -> bool

True if the argument is a boolean type, either integral C type or mathematical boolean one.

val isFloatingType : Cil_types.typ -> bool

True if the argument is a floating point type.

val isLogicFloatType : Cil_types.logic_type -> bool

True if the argument is a floating point type.

val isLogicRealOrFloatType : Cil_types.logic_type -> bool

True if the argument is a C floating point type or logic 'real' type.

val isLogicRealType : Cil_types.logic_type -> bool

True if the argument is the logic 'real' type.

val isArithmeticType : Cil_types.typ -> bool

True if the argument is an arithmetic type (i.e. integer, enum or floating point

val isScalarType : Cil_types.typ -> bool

True if the argument is a scalar type (i.e. integral, enum, floating point or pointer

  • since 22.0-Titanium
val isArithmeticOrPointerType : Cil_types.typ -> bool

alias of isScalarType.

  • deprecated

    22.0-Titanium use isScalarType instead

val isLogicArithmeticType : Cil_types.logic_type -> bool

True if the argument is a logic arithmetic type (i.e. integer, enum or floating point, either C or mathematical one.

val isFunctionType : Cil_types.typ -> bool

True if the argument is a function type

val isLogicFunctionType : Cil_types.logic_type -> bool

True if the argument is the logic function type. Expands the logic type definition if necessary.

  • since 18.0-Argon
val isPointerType : Cil_types.typ -> bool

True if the argument is a pointer type.

val isFunPtrType : Cil_types.typ -> bool

True if the argument is a function pointer type.

  • since 18.0-Argon
val isLogicFunPtrType : Cil_types.logic_type -> bool

True if the argument is the logic function pointer type. Expands the logic type definition if necessary.

  • since 18.0-Argon
val isTransparentUnion : Cil_types.typ -> Cil_types.fieldinfo option

Check if a type is a transparent union, and return the first field

  • since 28.0-Nickel
val isTypeTagType : Cil_types.logic_type -> bool

True if the argument is the type for reified C types.

val isVariadicListType : Cil_types.typ -> bool

True if the argument denotes the type of ... in a variadic function.

  • since Nitrogen-20111001 moved from cabs2cil
val argsToList : (string * Cil_types.typ * Cil_types.attributes) list option -> (string * Cil_types.typ * Cil_types.attributes) list

Obtain the argument list ( if None).

  • since 20.0-Calcium Beware that it contains the ghost arguments.
val argsToPairOfLists : (string * Cil_types.typ * Cil_types.attributes) list option -> (string * Cil_types.typ * Cil_types.attributes) list * (string * Cil_types.typ * Cil_types.attributes) list

Obtain the argument lists (non-ghost, ghosts) (, if None)

  • since 20.0-Calcium
val isArrayType : Cil_types.typ -> bool

True if the argument is an array type

val isUnsizedArrayType : Cil_types.typ -> bool

True if the argument is an array type without size

  • since 28.0-Nickel
val isSizedArrayType : Cil_types.typ -> bool

True if the argument is a sized array type

  • since 28.0-Nickel
val isStructType : Cil_types.typ -> bool

True if the argument is a struct

  • since 28.0-Nickel
val isUnionType : Cil_types.typ -> bool

True if the argument is a union type

  • since 28.0-Nickel
val isStructOrUnionType : Cil_types.typ -> bool

True if the argument is a struct or union type

type incorrect_array_length =
  1. | Not_constant
  2. | Not_integer
  3. | Negative
  4. | Too_big

possible causes for raising Cil.LenOfArray

val pp_incorrect_array_length : Format.formatter -> incorrect_array_length -> unit
exception LenOfArray of incorrect_array_length

Raised when Cil.lenOfArray fails either because the length is None, * because it is a non-constant expression, or because it overflows an int.

val lenOfArray : Cil_types.exp option -> int

Call to compute the array length as present in the array type, to an * integer. Raises Cil.LenOfArray if not able to compute the length, such * as when there is no length or the length is not a constant.

val lenOfArray64 : Cil_types.exp option -> Integer.t
val getCompField : Cil_types.compinfo -> string -> Cil_types.fieldinfo

Return a named fieldinfo in compinfo, or raise Not_found

type existsAction =
  1. | ExistsTrue
    (*

    We have found it

    *)
  2. | ExistsFalse
    (*

    Stop processing this branch

    *)
  3. | ExistsMaybe
    (*

    This node is not what we are * looking for but maybe its * successors are

    *)

A datatype to be used in conjunction with existsType

val existsType : (Cil_types.typ -> existsAction) -> Cil_types.typ -> bool

Scans a type by applying the function on all elements. When the function returns ExistsTrue, the scan stops with true. When the function returns ExistsFalse then the current branch is not scanned anymore. Care is taken to apply the function only once on each composite type, thus avoiding circularity. When the function returns ExistsMaybe then the types that construct the current type are scanned (e.g. the base type for TPtr and TArray, the type of fields for a TComp, etc).

val splitFunctionType : Cil_types.typ -> Cil_types.typ * (string * Cil_types.typ * Cil_types.attributes) list option * bool * Cil_types.attributes

Given a function type split it into return type, * arguments, is_vararg and attributes. An error is raised if the type is not * a function type

val splitFunctionTypeVI : Cil_types.varinfo -> Cil_types.typ * (string * Cil_types.typ * Cil_types.attributes) list option * bool * Cil_types.attributes

Same as Cil.splitFunctionType but takes a varinfo. Prints a nicer * error message if the varinfo is not for a function

exception Cannot_combine of string
type combineWhat =
  1. | CombineFundef of bool
    (*

    The new definition is for a function definition. The old is for a prototype. arg is true for an old-style declaration.

    *)
  2. | CombineFunarg of bool
    (*

    Comparing a function argument type with an old prototype argument. arg is true for an old-style declaration, which triggers some ad hoc treatment in GCC mode.

    *)
  3. | CombineFunret
    (*

    Comparing the return of a function with that from an old prototype

    *)
  4. | CombineOther

Used in combineTypes and combineTypesGen to indicate what we want to combine.

  • since 28.0-Nickel

combineAttributes what olda a combines the attributes in olda and a according to what:

  • if what == CombineFunarg, then override old attributes; this is used to ensure that attributes from formal argument types in a function definition are not mixed with attributes from arguments in other (compatible, but with different qualifiers) declarations;
  • else, perform the union of old and new attributes.
  • since 28.0-Nickel
type combineFunction = {
  1. typ_combine : combineFunction -> bool -> combineWhat -> Cil_types.typ -> Cil_types.typ -> Cil_types.typ;
    (*

    bool is about strictness in return context. See StrictReturnTypes in combineTypeGen

    *)
  2. enum_combine : combineFunction -> Cil_types.enuminfo -> Cil_types.enuminfo -> Cil_types.enuminfo;
  3. comp_combine : combineFunction -> Cil_types.compinfo -> Cil_types.compinfo -> Cil_types.compinfo;
  4. name_combine : combineFunction -> combineWhat -> Cil_types.typeinfo -> Cil_types.typeinfo -> Cil_types.typeinfo;
}

combineFunction contains information on how enum, struct/union and typedef are to be handled when combining with combineTypes and combineTypesGen. In pratice, the first argument of each field is a recursive definition.

  • since 28.0-Nickel
val combineTypesGen : ?emitwith:(Log.event -> unit) -> combineFunction -> ?strictInteger:bool -> ?strictReturnTypes:bool -> combineWhat -> Cil_types.typ -> Cil_types.typ -> Cil_types.typ

combineTypesGen combF combW oldt newt Combine oldt and newt accordingly to combF, combW indicates what we are combinining.

Warning : this is not commutative. Indeed, excluding enum, struct/union and typedef which depend on combF, the resulting type is as close as possible to newt.

strictInteger is true (default) if two integers with same size and sign but with different types cannot be combined. A warning is sent if it is false and the compatibility is machine-dependent.

strictReturnTypes is false (default) if a non-void type is compatible with void in a return case.

Notice that the ~emitwith action is called iff a warning is logged.

  • raises Cannot_combine

    with an explanation when the type cannot be combined.

  • since 28.0-Nickel
val combineTypes : ?strictReturnTypes:bool -> combineWhat -> Cil_types.typ -> Cil_types.typ -> Cil_types.typ

Specialized verison of combineTypesGen, we suppore here that if two global symbols are equal, then they are the same object.

  • since 28.0-Nickel
type qualifier_check_context =
  1. | Identical
    (*

    Identical qualifiers.

    *)
  2. | IdenticalToplevel
    (*

    Ignore at toplevel, use Identical when going under a pointer.

    *)
  3. | Covariant
    (*

    First type can have const-qualifications the second doesn't have.

    *)
  4. | CovariantToplevel
    (*

    Accepts everything for current type, use Covariant when going under a pointer.

    *)
  5. | Contravariant
    (*

    Second type can have const-qualifications the first doesn't have.

    *)
  6. | ContravariantToplevel
    (*

    Accepts everything for current type, use Contravariant when going under a pointer.

    *)

How type qualifiers must be checked when checking for types compatibility with areCompatibleTypes and compatibleTypes.

  • since 28.0-Nickel
val areCompatibleTypes : ?strictReturnTypes:bool -> ?context:qualifier_check_context -> Cil_types.typ -> Cil_types.typ -> bool

areCompatibleTypes returns true if two types are compatible. context indicates how check the compatibility of qualifiers. Other arguments are the same than combineTypes.

  • since 28.0-Nickel
val compatibleTypes : ?strictReturnTypes:bool -> ?context:qualifier_check_context -> Cil_types.typ -> Cil_types.typ -> Cil_types.typ

Same as areCompatibleTypes old newt but combine oldt and newt. context does not impact the qualifiers of the result.

  • since 28.0-Nickel

LVALUES

val makeVarinfo : ?source:bool -> ?temp:bool -> ?referenced:bool -> ?ghost:bool -> ?loc:Cil_datatype.Location.t -> bool -> bool -> string -> Cil_types.typ -> Cil_types.varinfo

Make a varinfo. Use this (rarely) to make a raw varinfo. Use other functions to make locals (Cil.makeLocalVar or Cil.makeFormalVar or Cil.makeTempVar) and globals (Cil.makeGlobalVar). Note that this function will assign a new identifier. The temp argument defaults to false, and corresponds to the vtemp field in type Cil_types.varinfo. The source argument defaults to true, and corresponds to the field vsource . The referenced argument defaults to false, and corresponds to the field vreferenced . The ghost argument defaults to false, and corresponds to the field vghost . The loc argument defaults to Location.unknown, and corresponds to the field vdecl . The first unnamed argument specifies whether the varinfo is for a global and the second is for formals.

val makeFormalVar : Cil_types.fundec -> ?ghost:bool -> ?where:string -> ?loc:Cil_datatype.Location.t -> string -> Cil_types.typ -> Cil_types.varinfo

Make a formal variable for a function declaration. Insert it in both the sformals and the type of the function. You can optionally specify where to insert this one. If where = "^" then it is inserted first. If where = "$" then it is inserted last. Otherwise where must be the name of a formal after which to insert this. By default it is inserted at the end.

The ghost parameter indicates if the variable should be inserted in the list of formals or ghost formals. By default, it takes the ghost status of the function where the formal is inserted. Note that:

  • specifying ghost to false if the function is ghost leads to an error
  • when where is specified, its status must be the same as the formal to insert (else, it cannot be found in the list of ghost or non ghost formals)
val makeLocalVar : Cil_types.fundec -> ?scope:Cil_types.block -> ?temp:bool -> ?referenced:bool -> ?insert:bool -> ?ghost:bool -> ?loc:Cil_datatype.Location.t -> string -> Cil_types.typ -> Cil_types.varinfo

Make a local variable and add it to a function's slocals and to the given block (only if insert = true, which is the default). Make sure you know what you are doing if you set insert=false. temp is passed to Cil.makeVarinfo. The variable is attached to the toplevel block if scope is not specified. If the name passed as argument already exists within the function, a fresh name will be generated for the varinfo.

val refresh_local_name : Cil_types.fundec -> Cil_types.varinfo -> unit

if needed, rename the given varinfo so that its vname does not clash with the one of a local or formal variable of the given function.

  • since Chlorine-20180501
val makeTempVar : Cil_types.fundec -> ?insert:bool -> ?ghost:bool -> ?name:string -> ?descr:string -> ?descrpure:bool -> ?loc:Cil_datatype.Location.t -> Cil_types.typ -> Cil_types.varinfo

Make a temporary variable and add it to a function's slocals. The name of the temporary variable will be generated based on the given name hint so that to avoid conflicts with other locals. Optionally, you can give the variable a description of its contents and its location. Temporary variables are always considered as generated variables. If insert is true (the default), the variable will be inserted among other locals of the function. The value for insert should only be changed if you are completely sure this is not useful.

val makeGlobalVar : ?source:bool -> ?temp:bool -> ?referenced:bool -> ?ghost:bool -> ?loc:Cil_datatype.Location.t -> string -> Cil_types.typ -> Cil_types.varinfo

Make a global variable. Your responsibility to make sure that the name is unique. source defaults to true. temp defaults to false.

val copyVarinfo : Cil_types.varinfo -> string -> Cil_types.varinfo

Make a shallow copy of a varinfo and assign a new identifier. If the original varinfo has an associated logic var, it is copied too and associated to the copied varinfo

val update_var_type : Cil_types.varinfo -> Cil_types.typ -> unit

Changes the type of a varinfo and of its associated logic var if any.

  • since Neon-20140301
val isBitfield : Cil_types.lval -> bool

Is an lvalue a bitfield?

Returns the last offset in the chain.

Add an offset at the end of an lvalue. Make sure the type of the lvalue * and the offset are compatible.

addOffset o1 o2 adds o1 to the end of o2.

val removeOffsetLval : Cil_types.lval -> Cil_types.lval * Cil_types.offset

Remove ONE offset from the end of an lvalue. Returns the lvalue with the * trimmed offset and the final offset. If the final offset is NoOffset * then the original lval did not have an offset.

Remove ONE offset from the end of an offset sequence. Returns the * trimmed offset and the final offset. If the final offset is NoOffset * then the original lval did not have an offset.

val typeOfLval : Cil_types.lval -> Cil_types.typ

Compute the type of an lvalue

val typeOfLhost : Cil_types.lhost -> Cil_types.typ

Compute the type of an lhost (with no offset)

Equivalent to typeOfLval for terms.

Compute the type of an offset from a base type

Equivalent to typeOffset for terms.

val typeOfInit : Cil_types.init -> Cil_types.typ

Compute the type of an initializer

val is_modifiable_lval : Cil_types.lval -> bool

indicates whether the given lval is a modifiable lvalue in the sense of the C standard 6.3.2.1§1.

Values for manipulating expressions

0

1

-1

val kinteger64 : loc:Cil_types.location -> ?repr:string -> ?kind:Cil_types.ikind -> Integer.t -> Cil_types.exp

Construct an integer of a given kind without literal representation. Truncate the integer if kind is given, and the integer does not fit inside the type. The integer can have an optional literal representation repr.

  • raises Not_representable

    if no ikind is provided and the integer is not representable.

val kinteger : loc:Cil_types.location -> Cil_types.ikind -> int -> Cil_types.exp

Construct an integer of a given kind. Converts the integer to int64 and * then uses kinteger64. This might truncate the value if you use a kind * that cannot represent the given integer. This can only happen for one of * the Char or Short kinds

val integer : loc:Cil_types.location -> int -> Cil_types.exp

Construct an integer of kind IInt. You can use this always since the OCaml integers are 31 bits and are guaranteed to fit in an IInt

val kfloat : loc:Cil_types.location -> Cil_types.fkind -> float -> Cil_types.exp

Constructs a floating point constant.

  • since Oxygen-20120901
val isInteger : Cil_types.exp -> Integer.t option

True if the given expression is a (possibly cast'ed) character or an integer constant

val isConstant : ?is_varinfo_cst:(Cil_types.varinfo -> bool) -> Cil_types.exp -> bool

True if the expression is a compile-time constant. is_varinfo_cst indicates whether a variable should be considered as having a constant content. Defaults to false.

  • before 28.0-Nickel

    is_varinfo_cst does not exist

val isIntegerConstant : ?is_varinfo_cst:(Cil_types.varinfo -> bool) -> Cil_types.exp -> bool

True if the expression is a compile-time integer constant

  • before 28.0-Nickel

    is_varinfo_cst does not exist

val isConstantOffset : ?is_varinfo_cst:(Cil_types.varinfo -> bool) -> Cil_types.offset -> bool

True if the given offset contains only field names or constant indices.

  • before 28.0-Nickel

    is_varinfo_cst does not exist

val isZero : Cil_types.exp -> bool

True if the given expression is a (possibly cast'ed) integer or character constant with value zero

val is_nullptr : Cil_types.exp -> bool

True if the given expression is a null pointer, i.e. 0, (void * )0, which are the two null pointer constants in the standard, or the cast of a null pointer (constant or not) into a pointer type.

  • since 28.0-Nickel
val isLogicZero : Cil_types.term -> bool

True if the term is the constant 0

val isLogicNull : Cil_types.term -> bool

True if the given term is \null or a constant null pointer

val no_op_coerce : Cil_types.logic_type -> Cil_types.term -> bool

no_op_coerce typ term is true iff converting term to typ does not modify its value.

  • since 19.0-Potassium
val reduce_multichar : Cil_types.typ -> int64 list -> int64

gives the value of a wide char literal.

val interpret_character_constant : int64 list -> Cil_types.constant * Cil_types.typ

gives the value of a char literal.

val charConstToInt : char -> Integer.t

Given the character c in a (CChr c), sign-extend it to 32 bits. (This is the official way of interpreting character constants, according to ISO C 6.4.4.4.10, which says that character constants are chars cast to ints) Returns CInt64(sign-extended c, IInt, None)

val charConstToIntConstant : char -> Cil_types.constant
val constFold : bool -> Cil_types.exp -> Cil_types.exp

Do constant folding on an expression. If the first argument is true then will also compute compiler-dependent expressions such as sizeof. See also Cil.constFoldVisitor, which will run constFold on all expressions in a given AST node.

val constFoldToInt : ?machdep:bool -> Cil_types.exp -> Integer.t option

Do constant folding on the given expression, just as constFold would. The resulting integer value, if the const-folding was complete, is returned. The machdep optional parameter, which is set to true by default, forces the simplification of architecture-dependent expressions.

val constFoldTermNodeAtTop : Cil_types.term_node -> Cil_types.term_node

Do constant folding on an term at toplevel only. This uses compiler-dependent informations and will remove all sizeof and alignof.

val constFoldTerm : bool -> Cil_types.term -> Cil_types.term

Do constant folding on an term. If the first argument is true then will also compute compiler-dependent expressions such as sizeof and alignof.

val constFoldOffset : bool -> Cil_types.offset -> Cil_types.offset

Do constant folding on a Cil_types.offset. If the second argument is true then will also compute compiler-dependent expressions such as sizeof.

Do constant folding on a binary operation. The bulk of the work done by constFold is done here. If the second argument is true then will also compute compiler-dependent expressions such as sizeof.

val compareConstant : Cil_types.constant -> Cil_types.constant -> bool

true if the two constant are equal.

  • since Nitrogen-20111001
val sameSizeInt : ?machdep:bool -> Cil_types.ikind -> Cil_types.ikind -> bool

true if two kinds have the same size independently of the machine.

val same_int64 : ?machdep:bool -> Cil_types.exp -> Cil_types.exp -> bool

true if the result of two expressions are two equal integers.

val increm : Cil_types.exp -> int -> Cil_types.exp

Increment an expression. Can be arithmetic or pointer type

Increment an expression. Can be arithmetic or pointer type

Makes an lvalue out of a given variable

Creates an expr representing the variable.

  • since Nitrogen-20111001

Make an AddrOf. Given an lvalue of type T will give back an expression of type ptr(T). It optimizes somewhat expressions like "& v" and "& v0"

val mkAddrOfVi : Cil_types.varinfo -> Cil_types.exp

Creates an expression corresponding to "&v".

  • since Oxygen-20120901
val mkAddrOrStartOf : loc:Cil_types.location -> Cil_types.lval -> Cil_types.exp

Like mkAddrOf except if the type of lval is an array then it uses StartOf. This is the right operation for getting a pointer to the start of the storage denoted by lval.

val mkMem : addr:Cil_types.exp -> off:Cil_types.offset -> Cil_types.lval

Make a Mem, while optimizing AddrOf. The type of the addr must be TPtr(t) and the type of the resulting lval is t. Note that in CIL the implicit conversion between an array and the pointer to the first element does not apply. You must do the conversion yourself using StartOf

makes a binary operation and performs const folding. Inserts casts between arithmetic types as needed, or between pointer types, but do not attempt to cast pointer to int or vice-versa. Use appropriate binop (PlusPI & friends) for that.

same as mkBinOp, but performs a systematic cast (unless one of the arguments is 0) of pointers into uintptr_t during comparisons, making such operation defined even if the pointers do not share the same base. This was the behavior of mkBinOp prior to the introduction of this function.

  • since Chlorine-20180501

Equivalent to mkMem for terms.

val mkString : loc:Cil_types.location -> string -> Cil_types.exp

Make an expression that is a string constant (of pointer type)

val need_cast : ?force:bool -> Cil_types.typ -> Cil_types.typ -> bool

true if both types are not equivalent. if force is true, returns true whenever both types are not equal (modulo typedefs). If force is false (the default), other equivalences are considered, in particular between an enum and its representative integer type.

val typeForInsertedCast : (Cil_types.exp -> Cil_types.typ -> Cil_types.typ -> Cil_types.typ) ref

typeForInsertedCast expr original_type destination_type returns the type into which expr, which has type original_type and whose type must be converted into destination_type, must be casted.

By default, returns destination_type.

This applies only to implicit casts. Casts already present in the source code are exempt from this hook.

  • since 28.0-Nickel
val checkCast : ?context:qualifier_check_context -> ?nullptr_cast:bool -> ?fromsource:bool -> Cil_types.typ -> Cil_types.typ -> unit

checkCast context fromsource nullptr_cast oldt newt emits a warning or an error if the cast from oldt to newt is invalid (does nothing otherwise). nullptr_cast is true iff the expression being casted is a null pointer. Default is false. fromsource is false (default) if the cast is not present in the source code. Check areCompatibleTypes documentation for context.

Suspicious cases that only emit a warning:

  • Implicit cast from a pointer to an integer.
  • Cast from a pointer to a function type to another pointer to a function type when the function types are not compatible.
  • Cast from an array to a pointer/array when types are not compatible.
  • Cast, in both directions, between pointer to an object type and pointer to a function type.
  • since 28.0-Nickel
val mkCastTGen : ?check:bool -> ?context:qualifier_check_context -> ?fromsource:bool -> ?force:bool -> oldt:Cil_types.typ -> newt:Cil_types.typ -> Cil_types.exp -> Cil_types.typ * Cil_types.exp

Generic version of Cil.mkCastT. Construct a cast when having the old type of the expression. fromsource is false (default) if the cast is not present in the source code. If check is true (default), we check that the cast is valid, emitting an error or warning if the cast is invalid. If the new type is the same as the old type, then no cast is added, unless force is true (default is false). Cast from oldt to newt, returning the new type and the new expression.

  • since 28.0-Nickel
val mkCastT : ?check:bool -> ?force:bool -> oldt:Cil_types.typ -> newt:Cil_types.typ -> Cil_types.exp -> Cil_types.exp

Construct a cast when having the old type of the expression. If the new type is the same as the old type, then no cast is added, unless force is true (default is false). Emit an error or warning if check is true and the cast is invalid.

  • before 23.0-Vanadium

    different order of arguments.

  • before 28.0-Nickel

    no check argument, it was always false.

val mkCast : ?check:bool -> ?force:bool -> newt:Cil_types.typ -> Cil_types.exp -> Cil_types.exp

Like Cil.mkCastT, but uses typeOf to get oldt.

  • before 23.0-Vanadium

    different order of arguments.

  • before 28.0-Nickel

    no check argument, it was always false.

val stripTermCasts : Cil_types.term -> Cil_types.term

Equivalent to stripCasts for terms.

val stripCasts : Cil_types.exp -> Cil_types.exp

Removes casts from this expression, but ignores casts within other expression constructs. So we delete the (A) and (B) casts from "(A)(B)(x + (C)y)", but leave the (C) cast.

Compute the type of an expression.

val typeOf_pointed : Cil_types.typ -> Cil_types.typ

Returns the type pointed by the given type. Asserts it is a pointer type.

val typeOf_array_elem : Cil_types.typ -> Cil_types.typ

Returns the type of the array elements of the given type. Asserts it is an array type.

val is_fully_arithmetic : Cil_types.typ -> bool

Returns true whenever the type contains only arithmetic types

val parseInt : string -> Integer.t

Convert a string representing a C integer literal to an Integer. Handles the prefixes 0x and 0 and the suffixes L, U, UL, LL, ULL.

val parseIntRes : string -> (Integer.t, string) result

Like parseInt, but returns Error message in case of failure, instead of aborting Frama-C.

  • since 24.0-Chromium
val parseIntExp : loc:Cil_types.location -> string -> Cil_types.exp

Like parseInt, but converts to an expression.

val parseIntExpRes : loc:Cil_types.location -> string -> (Cil_types.exp, string) result

Like parseIntExp, but returns Error message in case of failure, instead of aborting Frama-C.

  • since 24.0-Chromium
val parseIntLogic : loc:Cil_types.location -> string -> Cil_types.term

Like parseInt, but converts to a logic term.

val appears_in_expr : Cil_types.varinfo -> Cil_types.exp -> bool
  • returns

    true if the given variable appears in the expression.

Values for manipulating statements

val mkStmt : ?ghost:bool -> ?valid_sid:bool -> ?sattr:Cil_types.attributes -> Cil_types.stmtkind -> Cil_types.stmt

Construct a statement, given its kind. Initialize the sid field to -1 if valid_sid is false (the default), or to a valid sid if valid_sid is true, and labels, succs and preds to the empty list

val mkStmtCfg : before:bool -> new_stmtkind:Cil_types.stmtkind -> ref_stmt:Cil_types.stmt -> Cil_types.stmt
val mkBlock : Cil_types.stmt list -> Cil_types.block

Construct a block with no attributes, given a list of statements

val mkBlockNonScoping : Cil_types.stmt list -> Cil_types.block

Construct a non-scoping block, i.e. a block that is not used to determine the end of scope of local variables. Hence, the blocals of such a block must always be empty.

  • since Phosphorus-20170501-beta1
val mkStmtCfgBlock : Cil_types.stmt list -> Cil_types.stmt

Construct a block with no attributes, given a list of statements and wrap it into the Cfg.

val mkStmtOneInstr : ?ghost:bool -> ?valid_sid:bool -> ?sattr:Cil_types.attributes -> Cil_types.instr -> Cil_types.stmt

Construct a statement consisting of just one instruction See Cil.mkStmt for the signification of the optional args.

Try to compress statements so as to get maximal basic blocks. * use this instead of List.@ because you get fewer basic blocks

val mkEmptyStmt : ?ghost:bool -> ?valid_sid:bool -> ?sattr:Cil_types.attributes -> ?loc:Cil_types.location -> unit -> Cil_types.stmt

Returns an empty statement (of kind Instr). See mkStmt for ghost and valid_sid arguments.

val dummyInstr : Cil_types.instr

A instr to serve as a placeholder

val dummyStmt : Cil_types.stmt

A statement consisting of just dummyInstr.

val mkPureExprInstr : fundec:Cil_types.fundec -> scope:Cil_types.block -> ?loc:Cil_types.location -> Cil_types.exp -> Cil_types.instr

Create an instruction equivalent to a pure expression. The new instruction corresponds to the initialization of a new fresh variable, i.e. int tmp = exp. The scope of this fresh variable is determined by the block given in argument, that is the instruction must be placed directly (modulo non-scoping blocks) inside this block.

val mkPureExpr : ?ghost:bool -> ?valid_sid:bool -> fundec:Cil_types.fundec -> ?loc:Cil_types.location -> Cil_types.exp -> Cil_types.stmt

Create an instruction as above, enclosed in a block of a single (Instr) statement, which will be the scope of the fresh variable holding the value of the expression.

See Cil.mkStmt for information about ghost and valid_sid, and Cil.mkPureExprInstr for information about loc.

val mkLoop : ?sattr:Cil_types.attributes -> guard:Cil_types.exp -> body:Cil_types.stmt list -> unit -> Cil_types.stmt list

Make a loop. Can contain Break or Continue. The kind of loop (while, for, dowhile) is given by sattr (none by default). Use Cil.mkWhile for a While loop.

  • before 23.0-Vanadium

    no unit argument, and default type was While (for while loops, there is now Cil.mkWhile).

val mkForIncr : ?sattr:Cil_types.attributes -> iter:Cil_types.varinfo -> first:Cil_types.exp -> stopat:Cil_types.exp -> incr:Cil_types.exp -> body:Cil_types.stmt list -> unit -> Cil_types.stmt list

Make a for loop for(i=start; i<past; i += incr) { ... }. The body can contain Break but not Continue. Can be used with i a pointer or an integer. Start and done must have the same type but incr must be an integer

  • before 23.0-Vanadium

    did not have unit argument.

val mkFor : ?sattr:Cil_types.attributes -> start:Cil_types.stmt list -> guard:Cil_types.exp -> next:Cil_types.stmt list -> body:Cil_types.stmt list -> unit -> Cil_types.stmt list

Make a for loop for(start; guard; next) { ... }. The body can contain Break but not Continue !!!

  • before 23.0-Vanadium

    did not have unit argument.

val mkWhile : ?sattr:Cil_types.attributes -> guard:Cil_types.exp -> body:Cil_types.stmt list -> unit -> Cil_types.stmt list

Make a while loop.

  • since 23.0-Vanadium
val mkDoWhile : ?sattr:Cil_types.attributes -> body:Cil_types.stmt list -> guard:Cil_types.exp -> unit -> Cil_types.stmt list

Make a do ... while loop.

  • since 23.0-Vanadium
val block_from_unspecified_sequence : (Cil_types.stmt * Cil_types.lval list * Cil_types.lval list * Cil_types.lval list * Cil_types.stmt ref list) list -> Cil_types.block

creates a block with empty attributes from an unspecified sequence.

treat_constructor_as_func action v f args kind loc calls action with the parameters corresponding to the call to f, of kind kind, initializing v with arguments args.

  • since Phosphorus-20170501-beta1

find_def_stmt b v returns the Local_init instruction within b that initializes v. v must have its vdefined field set to true, and be among b.blocals.

  • raises Fatal

    error if v is not a local variable of b with an initializer.

  • since Phosphorus-20170501-beta1
val has_extern_local_init : Cil_types.block -> bool

returns true iff the given non-scoping block contains local init statements (thus of locals belonging to an outer block), either directly or within a non-scoping block or undefined sequence.labels

  • since Phosphorus-20170501-beta1
val is_ghost_else : Cil_types.block -> bool

returns true iff the given block is a ghost else block.

  • since 21.0-Scandium

Values for manipulating attributes

type attributeClass =
  1. | AttrName of bool
    (*

    Attribute of a name. If argument is true and we are on MSVC then the attribute is printed using __declspec as part of the storage specifier

    *)
  2. | AttrFunType of bool
    (*

    Attribute of a function type. If argument is true and we are on MSVC then the attribute is printed just before the function name

    *)
  3. | AttrType
    (*

    Attribute of a type

    *)

Various classes of attributes

val registerAttribute : string -> attributeClass -> unit

Add a new attribute with a specified class

val removeAttribute : string -> unit

Remove an attribute previously registered.

val attributeClass : string -> attributeClass

Return the class of an attributes.

val partitionAttributes : default:attributeClass -> Cil_types.attributes -> Cil_types.attribute list * Cil_types.attribute list * Cil_types.attribute list

Partition the attributes into classes:name attributes, function type, and type attributes

Add an attribute. Maintains the attributes in sorted order of the second argument. The attribute is not added if it is already there.

Add a list of attributes. Maintains the attributes in sorted order. The second argument must be sorted, but not necessarily the first

val dropAttribute : string -> Cil_types.attributes -> Cil_types.attributes

Remove all attributes with the given name. Maintains the attributes in sorted order.

val dropAttributes : string list -> Cil_types.attributes -> Cil_types.attributes

Remove all attributes with names appearing in the string list. * Maintains the attributes in sorted order

val frama_c_ghost_else : string

A block marked with this attribute is known to be a ghost else.

  • since 21.0-Scandium
val frama_c_ghost_formal : string

A varinfo marked with this attribute is known to be a ghost formal.

  • since 20.0-Calcium
val frama_c_init_obj : string

a formal marked with this attribute is known to be a pointer to an object being initialized by the current function, which can thus assign any sub-object regardless of const status.

  • since 18.0-Argon
val frama_c_mutable : string

a field struct marked with this attribute is known to be mutable, i.e. it can be modified even on a const object.

  • since 18.0-Argon
val frama_c_inlined : string

A block marked with this attribute is known to be inlined, i.e. it replaces a call to an inline function.

val is_initialized : Cil_types.exp -> bool

true if the underlying left-value of the given expression is allowed to be assigned to thanks to a frama_c_init_obj attribute.

val is_mutable_or_initialized : Cil_types.lval -> bool

true if the given lval is allowed to be assigned to thanks to a frama_c_init_obj or a frama_c_mutable attribute.

val isGhostFormalVarinfo : Cil_types.varinfo -> bool

true if the given varinfo is a ghost formal variable.

  • since 20.0-Calcium
val isGhostFormalVarDecl : (string * Cil_types.typ * Cil_types.attributes) -> bool

true if the given formal declaration corresponds to a ghost formal variable.

  • since 20.0-Calcium
val isGlobalInitConst : Cil_types.varinfo -> bool

true iff the given variable is a const global variable with non extern storage.

  • since 25.0-Manganese
val typeDeepDropAllAttributes : Cil_types.typ -> Cil_types.typ

Remove any attribute appearing somewhere in the fully expanded version of the type.

  • since Oxygen-20120901
val filterAttributes : string -> Cil_types.attributes -> Cil_types.attributes

Retains attributes with the given name

val hasAttribute : string -> Cil_types.attributes -> bool

True if the named attribute appears in the attribute list. The list of attributes must be sorted.

val attributeName : Cil_types.attribute -> string

Returns the name of an attribute.

val findAttribute : string -> Cil_types.attribute list -> Cil_types.attrparam list

Returns the list of parameters associated to an attribute. The list is empty if there is no such attribute or it has no parameters at all.

val typeAttrs : Cil_types.typ -> Cil_types.attribute list

Returns all the attributes contained in a type. This requires a traversal of the type structure, in case of composite, enumeration and named types

val typeAttr : Cil_types.typ -> Cil_types.attribute list

Returns the attributes of a type.

Sets the attributes of the type to the given list. Previous attributes are discarded.

Add some attributes to a type. combine explains how to combine attributes. Default is addAttributes.

  • before 28.0-Nickel

    combine does not exist

val typeRemoveAttributes : string list -> Cil_types.typ -> Cil_types.typ

Remove all attributes with the given names from a type. Note that this does not remove attributes from typedef and tag definitions, just from their uses (unfolding the type definition when needed). It only removes attributes of topmost type, i.e. does not recurse under pointers, arrays, ...

val typeRemoveAllAttributes : Cil_types.typ -> Cil_types.typ

same as above, but remove any existing attribute from the type.

  • since Magnesium-20151001
val typeRemoveAttributesDeep : string list -> Cil_types.typ -> Cil_types.typ

Same as typeRemoveAttributes, but recursively removes the given attributes from inner types as well. Mainly useful to check whether two types are equal modulo some attributes. See also typeDeepDropAllAttributes, which will strip every single attribute from a type.

val typeHasAttribute : string -> Cil_types.typ -> bool

Does the type have the given attribute. Does not recurse through pointer types, nor inside function prototypes.

  • since Sodium-20150201
val typeHasQualifier : string -> Cil_types.typ -> bool

Does the type have the given qualifier. Handles the case of arrays, for which the qualifiers are actually carried by the type of the elements. It is always correct to call this function instead of typeHasAttribute. For l-values, both functions return the same results, as l-values cannot have array type.

  • since Sodium-20150201
val typeHasAttributeMemoryBlock : string -> Cil_types.typ -> bool

typeHasAttributeMemoryBlock attr t is true iff at least one component of an object of type t has attribute attr. In other words, it searches for attr under aggregates, but not under pointers.

  • since Chlorine-20180501 replaces typeHasAttributeDeep (name too ambiguous)
val type_remove_qualifier_attributes : Cil_types.typ -> Cil_types.typ

Remove all attributes relative to const, volatile and restrict attributes

  • since Nitrogen-20111001
val type_remove_qualifier_attributes_deep : Cil_types.typ -> Cil_types.typ

remove also qualifiers under Ptr and Arrays

  • since Sodium-20150201
val type_remove_attributes_for_c_cast : Cil_types.typ -> Cil_types.typ

Remove all attributes relative to const, volatile and restrict attributes when building a C cast

  • since Oxygen-20120901
val type_remove_attributes_for_logic_type : Cil_types.typ -> Cil_types.typ

Remove all attributes relative to const, volatile and restrict attributes when building a logic cast

  • since Oxygen-20120901
val filter_qualifier_attributes : Cil_types.attributes -> Cil_types.attributes

retains attributes corresponding to type qualifiers (6.7.3)

given some attributes on an array type, split them into those that belong to the type of the elements of the array (currently, qualifiers such as const and volatile), and those that must remain on the array, in that order

  • since Oxygen-20120901
val bitfield_attribute_name : string

Name of the attribute that is automatically inserted (with an AINT size argument when querying the type of a field that is a bitfield

val anonymous_attribute_name : string

Name of the attribute that is inserted when generating a name for a varinfo representing an anonymous function parameter.

  • since 24.0-Chromium
val anonymous_attribute : Cil_types.attribute

attribute identifying anonymous function parameters

  • since 24.0-Chromium
val expToAttrParam : Cil_types.exp -> Cil_types.attrparam

Convert an expression into an attrparam, if possible. Otherwise raise NotAnAttrParam with the offending subexpression

val global_annotation_attributes : Cil_types.global_annotation -> Cil_types.attributes

Return the attributes of the global annotation, if any.

  • since 20.0-Calcium
val global_attributes : Cil_types.global -> Cil_types.attributes

Return the attributes of the global, if any.

  • since 20.0-Calcium
val is_in_libc : Cil_types.attributes -> bool

Whether the given attributes contain libc indicators.

  • since 23.0-Vanadium
val global_is_in_libc : Cil_types.global -> bool

Whether the given global contains libc indicators.

  • since 23.0-Vanadium
exception NotAnAttrParam of Cil_types.exp

Const Attribute

val isConstType : Cil_types.typ -> bool

Check for "const" qualifier from the type of an l-value (do not follow pointer)

  • returns

    true iff a part of the related l-value has "const" qualifier

  • since Chlorine-20180501

Volatile Attribute

val isVolatileType : Cil_types.typ -> bool

Check for "volatile" qualifier from the type of an l-value (do not follow pointer)

  • returns

    true iff a part of the related l-value has "volatile" qualifier

  • since Sulfur-20171101
val isVolatileLogicType : Cil_types.logic_type -> bool

Check for "volatile" qualifier from a logic type

  • since Sulfur-20171101
val isVolatileLval : Cil_types.lval -> bool

Check if the l-value has a volatile part

  • since Sulfur-20171101
val isVolatileTermLval : Cil_types.term_lval -> bool

Check if the l-value has a volatile part

  • since Sulfur-20171101

Ghost Attribute

val isGhostType : Cil_types.typ -> bool

Check for "ghost" qualifier from the type of an l-value (do not follow pointer)

  • returns

    true iff a part of the related l-value has "ghost" qualifier

  • since 21.0-Scandium
val isWFGhostType : Cil_types.typ -> bool

Check if the received type is well-formed according to \ghost semantics, that is once the type is not ghost anymore, \ghost cannot appear again.

  • returns

    true iff the type is well formed

  • since 21.0-Scandium
val typeAddGhost : Cil_types.typ -> Cil_types.typ

Add the ghost attribute to a type (does nothing if the type is alreay ghost)

  • returns

    the ghost qualified original type

  • since 26.0-Iron

The visitor

type 'a visitAction =
  1. | SkipChildren
    (*

    Do not visit the children. Return the node as it is.

    *)
  2. | DoChildren
    (*

    Continue with the children of this node. Rebuild the node on return if any of the children changes (use == test).

    *)
  3. | DoChildrenPost of 'a -> 'a
    (*

    visit the children, and apply the given function to the result.

    *)
  4. | JustCopy
    (*

    visit the children, but only to make the necessary copies (only useful for copy visitor).

    *)
  5. | JustCopyPost of 'a -> 'a
    (*

    same as JustCopy + applies the given function to the result.

    *)
  6. | ChangeTo of 'a
    (*

    Replace the expression with the given one.

    *)
  7. | ChangeToPost of 'a * 'a -> 'a
    (*

    applies the expression to the function and gives back the result. Useful to insert some actions in an inheritance chain.

    *)
  8. | ChangeDoChildrenPost of 'a * 'a -> 'a
    (*

    First consider that the entire exp is replaced by the first parameter. Then continue with the children. On return rebuild the node if any of the children has changed and then apply the function on the node.

    *)

Different visiting actions. 'a will be instantiated with exp, instr, etc.

val mk_behavior : ?name:string -> ?assumes:Cil_types.identified_predicate list -> ?requires:Cil_types.identified_predicate list -> ?post_cond:(Cil_types.termination_kind * Cil_types.identified_predicate) list -> ?assigns:Cil_types.assigns -> ?allocation:Cil_types.allocation -> ?extended:Cil_types.acsl_extension list -> unit -> Cil_types.behavior

returns a dummy behavior with the default name Cil.default_behavior_name. invariant: b_assumes must always be empty for behavior named Cil.default_behavior_name

  • since Carbon-20101201
val default_behavior_name : string
  • since Carbon-20101201
val is_default_behavior : Cil_types.behavior -> bool
val find_default_behavior : Cil_types.funspec -> Cil_types.funbehavior option
  • since Carbon-20101201
val find_default_requires : Cil_types.behavior list -> Cil_types.identified_predicate list
  • since Carbon-20101201

Visitor mechanism

Visitor class

class type cilVisitor = object ... end

A visitor interface for traversing CIL trees. Create instantiations of this type by specializing the class nopCilVisitor. Each of the specialized visiting functions can also call the queueInstr to specify that some instructions should be inserted before the current statement. Use syntax like self#queueInstr to call a method associated with the current object.

generic visitor, parameterized by its copying behavior. Traverses the CIL tree without modifying anything

Default in place visitor doing nothing and operating on current project.

Generic visit functions

val doVisit : 'visitor -> 'visitor -> ('a -> 'a) -> ('a -> 'a visitAction) -> ('visitor -> 'a -> 'a) -> 'a -> 'a

doVisit vis deepCopyVisitor copy action children node visits a node (or its copy according to the result of copy) and if needed its children. Do not use it if you don't understand Cil visitor mechanism

  • parameter vis

    the visitor performing the needed transformations. The open type allows for extensions to Cil to be visited by the same mechanisms.

  • parameter deepCopyVisitor

    a generator for a visitor of the same type of the current one that performs a deep copy of the AST. Needed when the visitAction is SkipChildren or ChangeTo and vis is a copy visitor (we need to finish the copy anyway)

  • parameter copy

    function that may return a copy of the actual node.

  • parameter action

    the visiting function for the current node

  • parameter children

    what to do on the children of the current node

  • parameter node

    the current node

val doVisitList : 'visitor -> 'visitor -> ('a -> 'a) -> ('a -> 'a list visitAction) -> ('visitor -> 'a -> 'a) -> 'a -> 'a list

same as above, but can return a list of nodes

Visitor's entry points

val visitCilFileCopy : cilVisitor -> Cil_types.file -> Cil_types.file

Visit a file. This will re-cons all globals TWICE (so that it is * tail-recursive). Use Cil.visitCilFileSameGlobals if your visitor will * not change the list of globals.

val visitCilFile : cilVisitor -> Cil_types.file -> unit

Same thing, but the result is ignored. The given visitor must thus be an inplace visitor. Nothing is done if the visitor is a copy visitor.

val visitCilFileSameGlobals : cilVisitor -> Cil_types.file -> unit

A visitor for the whole file that does not *physically* change the globals (but maybe changes things inside the globals through side-effects). Use this function instead of Cil.visitCilFile whenever appropriate because it is more efficient for long files.

val visitCilFileFunctions : cilVisitor -> Cil_types.file -> unit

Same as Cil.visitCilFileSameGlobals, but only visits function definitions (i.e. behaves as if all globals but GFun return SkipChildren).

  • since 25.0-Manganese
val visitCilGlobal : cilVisitor -> Cil_types.global -> Cil_types.global list

Visit a global

val visitCilFunction : cilVisitor -> Cil_types.fundec -> Cil_types.fundec

Visit a function definition

val visitCilExpr : cilVisitor -> Cil_types.exp -> Cil_types.exp
val visitCilEnumInfo : cilVisitor -> Cil_types.enuminfo -> Cil_types.enuminfo
val visitCilLval : cilVisitor -> Cil_types.lval -> Cil_types.lval

Visit an lvalue

val visitCilOffset : cilVisitor -> Cil_types.offset -> Cil_types.offset

Visit an lvalue or recursive offset

val visitCilInitOffset : cilVisitor -> Cil_types.offset -> Cil_types.offset

Visit an initializer offset

Visit a local initializer (with the local being initialized).

val visitCilInstr : cilVisitor -> Cil_types.instr -> Cil_types.instr list

Visit an instruction

val visitCilStmt : cilVisitor -> Cil_types.stmt -> Cil_types.stmt

Visit a statement

val visitCilBlock : cilVisitor -> Cil_types.block -> Cil_types.block

Visit a block

val transient_block : Cil_types.block -> Cil_types.block

Mark the given block as candidate to be flattened into its parent block, after returning from its visit. This is not systematic, as the environment might prevent it (e.g. if the preceding statement is a statement contract or a slicing/pragma annotation, or if there are labels involved). Use that whenever you're creating a block in order to hold multiple statements as a result of visiting a single statement. If the block contains local variables, it will not be marked as transient, since removing it will change the scope of those variables.

  • raises Fatal

    error if the given block attempts to declare local variables and contain definitions of local variables that are not part of the block.

  • since Phosphorus-20170501-beta1
val is_transient_block : Cil_types.block -> bool

tells whether the block has been marked as transient

  • since Phosphorus-20170501-beta1.
val flatten_transient_sub_blocks : Cil_types.block -> Cil_types.block

flatten_transient_sub_blocks b flattens all direct sub-blocks of b that have been marked as cleanable, whenever possible

  • since Phosphorus-20170501-beta1
val visitCilType : cilVisitor -> Cil_types.typ -> Cil_types.typ

Visit a type

val visitCilVarDecl : cilVisitor -> Cil_types.varinfo -> Cil_types.varinfo

Visit a variable declaration

Visit an initializer, pass also the global to which this belongs and the * offset.

val visitCilAttributes : cilVisitor -> Cil_types.attribute list -> Cil_types.attribute list

Visit a list of attributes

val visitCilDeps : cilVisitor -> Cil_types.deps -> Cil_types.deps
val visitCilFrom : cilVisitor -> Cil_types.from -> Cil_types.from
val visitCilAssigns : cilVisitor -> Cil_types.assigns -> Cil_types.assigns
  • since Oxygen-20120901
val visitCilAllocates : cilVisitor -> Cil_types.identified_term list -> Cil_types.identified_term list
  • since Oxygen-20120901
  • since Oxygen-20120901
val visitCilFunspec : cilVisitor -> Cil_types.funspec -> Cil_types.funspec
val visitCilBehaviors : cilVisitor -> Cil_types.funbehavior list -> Cil_types.funbehavior list

visit an extended clause of a behavior.

  • since Nitrogen-20111001
val visitCilPredicate : cilVisitor -> Cil_types.predicate -> Cil_types.predicate
val visitCilTerm : cilVisitor -> Cil_types.term -> Cil_types.term

visit identified_term.

  • since Oxygen-20120901

visit term_lval.

  • since Nitrogen-20111001
val visitCilLogicVarUse : cilVisitor -> Cil_types.logic_var -> Cil_types.logic_var
val visitCilLogicVarDecl : cilVisitor -> Cil_types.logic_var -> Cil_types.logic_var

Visiting children of a node

Utility functions

val is_skip : Cil_types.stmtkind -> bool
val constFoldVisitor : bool -> cilVisitor

A visitor that does constant folding. Pass as argument whether you want machine specific simplifications to be done, or not.

Debugging support

A reference to the current location. If you are careful to set this to * the current location then you can use some built-in logging functions that * will print the location.

val pp_thisloc : Format.formatter -> unit

Pretty-print (Cil.CurrentLoc.get ())

val empty_funspec : unit -> Cil_types.funspec
  • returns

    a dummy specification

val is_empty_funspec : Cil_types.funspec -> bool
  • returns

    true if the given spec is empty.

val is_empty_behavior : Cil_types.funbehavior -> bool
  • returns

    true if the given behavior is empty.

Renaming

See also the Alpha module for other renaming operations.

val uniqueVarNames : Cil_types.file -> unit

Assign unique names to local variables. This might be necessary after you transformed the code and added or renamed some new variables. Names are not used by CIL internally, but once you print the file out the compiler downstream might be confused. You might have added a new global that happens to have the same name as a local in some function. Rename the local to ensure that there would never be confusion. Or, viceversa, you might have added a local with a name that conflicts with a global

Optimization Passes

val peepHole2 : aggressive:bool -> ((Cil_types.stmt * Cil_types.stmt) -> Cil_types.stmt list option) -> Cil_types.stmt list -> Cil_types.stmt list

A peephole optimizer that processes two adjacent statements and possibly replaces them both. If some replacement happens and aggressive is true, then the new statements are themselves subject to optimization. Each statement in the list is optimized independently.

val peepHole1 : (Cil_types.instr -> Cil_types.instr list option) -> Cil_types.stmt list -> unit

Similar to peepHole2 except that the optimization window consists of one statement, not two

Machine dependency

exception SizeOfError of string * Cil_types.typ

Raised when one of the SizeOf/AlignOf functions cannot compute the size of a type. This can happen because the type contains array-length expressions that we don't know how to compute or because it is a type whose size is not defined (e.g. TFun or an undefined compinfo). The string is an explanation of the error

val unsignedVersionOf : Cil_types.ikind -> Cil_types.ikind

Give the unsigned kind corresponding to any integer kind

val intKindForSize : int -> bool -> Cil_types.ikind

The signed integer kind for a given size (unsigned if second argument * is true). Raises Not_found if no such kind exists

val floatKindForSize : int -> Cil_types.fkind

The float kind for a given size. Raises Not_found * if no such kind exists

val bitsSizeOf : Cil_types.typ -> int

The size of a type, in bits. Trailing padding is added for structs and * arrays. Raises Cil.SizeOfError when it cannot compute the size. This * function is architecture dependent, so you should only call this after you * call Cil.initCIL. Remember that on GCC sizeof(void) is 1!

val bytesSizeOf : Cil_types.typ -> int

The size of a type, in bytes. Raises Cil.SizeOfError when it cannot compute the size.

val bytesSizeOfInt : Cil_types.ikind -> int

Returns the number of bytes (resp. bits) to represent the given integer kind depending on the current machdep.

val bitsSizeOfInt : Cil_types.ikind -> int
val isSigned : Cil_types.ikind -> bool

Returns the signedness of the given integer kind depending on the current machdep.

val bitsSizeOfBitfield : Cil_types.typ -> int

Returns the size of the given type, in bits. If this is the type of an lvalue which is a bitfield, the size of the bitfield is returned.

val selfTypSize : State.t

Cache for sizeof

val rank : Cil_types.ikind -> int

Returns a unique number representing the integer conversion rank.

val intTypeIncluded : Cil_types.ikind -> Cil_types.ikind -> bool

intTypeIncluded i1 i2 returns true iff the range of values representable in i1 is included in the one of i2

val frank : Cil_types.fkind -> int

Returns a unique number representing the floating-point conversion rank.

  • since Oxygen-20120901
val truncateInteger64 : Cil_types.ikind -> Integer.t -> Integer.t * bool

Represents an integer as for a given kind. * Returns a flag saying whether the value was changed * during truncation (because it was too large to fit in k).

val max_signed_number : int -> Integer.t

Returns the maximal value representable in a signed integer type of the given size (in bits)

val min_signed_number : int -> Integer.t

Returns the smallest value representable in a signed integer type of the given size (in bits)

val max_unsigned_number : int -> Integer.t

Returns the maximal value representable in a unsigned integer type of the given size (in bits)

val fitsInInt : Cil_types.ikind -> Integer.t -> bool

True if the integer fits within the kind's range

val isFiniteFloat : Cil_types.fkind -> float -> bool

True if the float is finite for the kind's range

val isExactFloat : Cil_types.fkind -> Cil_types.logic_real -> bool

True if the real constant is an exact float for the given type

exception Not_representable

raised by intKindForValue.

val intKindForValue : Integer.t -> bool -> Cil_types.ikind
  • returns

    the smallest kind that will hold the integer's value. The kind will be unsigned if the 2nd argument is true.

The size of a type, in bytes. Returns a constant expression or a "sizeof" * expression if it cannot compute the size. This function is architecture * dependent, so you should only call this after you call Cil.initCIL.

val bytesAlignOf : Cil_types.typ -> int

The minimum alignment (in bytes) for a type. This function is * architecture dependent, so you should only call this after you call * Cil.initCIL. * Raises SizeOfError when it cannot compute the alignment.

val intOfAttrparam : Cil_types.attrparam -> int option

intOfAttrparam a tries to const-fold a into a numeric value. Returns Some n if it succeeds, None otherwise.

  • since Silicium-20161101
val bitsOffset : Cil_types.typ -> Cil_types.offset -> int * int

Give a type of a base and an offset, returns the number of bits from the * base address and the width (also expressed in bits) for the subobject * denoted by the offset. Raises Cil.SizeOfError when it cannot compute * the size. This function is architecture dependent, so you should only call * this after you call Cil.initCIL.

val fieldBitsOffset : Cil_types.fieldinfo -> int * int

Give a field, returns the number of bits from the structure or union * containing the field and the width (also expressed in bits) for the subobject * denoted by the field. Raises Cil.SizeOfError when it cannot compute * the size. This function is architecture dependent, so you should only call * this after you call Cil.initCIL.

val mapNoCopy : ('a -> 'a) -> 'a list -> 'a list

Like map but try not to make a copy of the list

val optMapNoCopy : ('a -> 'a) -> 'a option -> 'a option

same as mapNoCopy for options

val mapNoCopyList : ('a -> 'a list) -> 'a list -> 'a list

Like map but each call can return a list. Try not to make a copy of the list

val startsWith : string -> string -> bool

sm: return true if the first is a prefix of the second string

An Interpreter for constructing CIL constructs

type formatArg =
  1. | Fe of Cil_types.exp
  2. | Feo of Cil_types.exp option
    (*

    For array lengths

    *)
  3. | Fu of Cil_types.unop
  4. | Fb of Cil_types.binop
  5. | Fk of Cil_types.ikind
  6. | FE of Cil_types.exp list
    (*

    For arguments in a function call

    *)
  7. | Ff of string * Cil_types.typ * Cil_types.attributes
    (*

    For a formal argument

    *)
  8. | FF of (string * Cil_types.typ * Cil_types.attributes) list
    (*

    For formal argument lists

    *)
  9. | Fva of bool
    (*

    For the ellipsis in a function type

    *)
  10. | Fv of Cil_types.varinfo
  11. | Fl of Cil_types.lval
  12. | Flo of Cil_types.lval option
  13. | Fo of Cil_types.offset
  14. | Fc of Cil_types.compinfo
  15. | Fi of Cil_types.instr
  16. | FI of Cil_types.instr list
  17. | Ft of Cil_types.typ
  18. | Fd of int
  19. | Fg of string
  20. | Fs of Cil_types.stmt
  21. | FS of Cil_types.stmt list
  22. | FA of Cil_types.attributes
  23. | Fp of Cil_types.attrparam
  24. | FP of Cil_types.attrparam list
  25. | FX of string

The type of argument for the interpreter

val d_formatarg : Format.formatter -> formatArg -> unit

Misc

val stmt_of_instr_list : ?loc:Cil_types.location -> Cil_types.instr list -> Cil_types.stmtkind

if the list has 2 elements or more, it will return a block with bscoping=false

Convert a C variable into the corresponding logic variable. The returned logic variable is unique for a given C variable.

Convert a C variable into a logic term.

  • since 24.0-Chromium
val make_temp_logic_var : Cil_types.logic_type -> Cil_types.logic_var

Make a temporary variable to use in annotations

val lzero : ?loc:Cil_types.location -> unit -> Cil_types.term

The constant logic term zero.

val lone : ?loc:Cil_types.location -> unit -> Cil_types.term

The constant logic term 1.

val lmone : ?loc:Cil_types.location -> unit -> Cil_types.term

The constant logic term -1.

val lconstant : ?loc:Cil_types.location -> Integer.t -> Cil_types.term

The given constant logic term

val close_predicate : Cil_types.predicate -> Cil_types.predicate

Bind all free variables with an universal quantifier

val extract_varinfos_from_exp : Cil_types.exp -> Cil_datatype.Varinfo.Set.t

extract varinfo elements from an exp

val extract_varinfos_from_lval : Cil_types.lval -> Cil_datatype.Varinfo.Set.t

extract varinfo elements from an lval

val extract_free_logicvars_from_term : Cil_types.term -> Cil_datatype.Logic_var.Set.t

extract logic_var elements from a term

val extract_free_logicvars_from_predicate : Cil_types.predicate -> Cil_datatype.Logic_var.Set.t

extract logic_var elements from a predicate

extract logic_label elements from a code_annotation

val extract_labels_from_term : Cil_types.term -> Cil_datatype.Logic_label.Set.t

extract logic_label elements from a term

val extract_labels_from_pred : Cil_types.predicate -> Cil_datatype.Logic_label.Set.t

extract logic_label elements from a pred

val extract_stmts_from_labels : Cil_datatype.Logic_label.Set.t -> Cil_datatype.Stmt.Set.t

extract stmt elements from logic_label elements

val create_alpha_renaming : Cil_types.varinfo list -> Cil_types.varinfo list -> cilVisitor

creates a visitor that will replace in place uses of var in the first list by their counterpart in the second list.

val separate_switch_succs : Cil_types.stmt -> Cil_types.stmt list * Cil_types.stmt

Provided s is a switch, separate_switch_succs s returns the subset of s.succs that correspond to the Case labels of s, and a "default statement" that either corresponds to the Default label, or to the syntactic successor of s if there is no default label. Note that this "default statement" can thus appear in the returned list.

val separate_if_succs : Cil_types.stmt -> Cil_types.stmt * Cil_types.stmt

Provided s is a if, separate_if_succs s splits the successors of s according to the truth value of the condition. The first element of the pair is the successor statement if the condition is true, and the second if the condition is false.

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