R function implemented within the interpreter. More...

#include <BuiltInFunction.h>

Inheritance diagram for CXXR::BuiltInFunction:

Collaboration diagram for CXXR::BuiltInFunction:

Public Types
enum	Kind { PP_INVALID = 0, PP_ASSIGN = 1, PP_ASSIGN2 = 2, PP_BINARY = 3, PP_BINARY2 = 4, PP_BREAK = 5, PP_CURLY = 6, PP_FOR = 7, PP_FUNCALL = 8, PP_FUNCTION = 9, PP_IF = 10, PP_NEXT = 11, PP_PAREN = 12, PP_RETURN = 13, PP_SUBASS = 14, PP_SUBSET = 15, PP_WHILE = 16, PP_UNARY = 17, PP_DOLLAR = 18, PP_FOREIGN = 19, PP_REPEAT = 20 }
	Kind of function, used mainly in deparsing.
enum	Precedence { PREC_FN = 0, PREC_LEFT = 1, PREC_EQ = 2, PREC_RIGHT = 3, PREC_TILDE = 4, PREC_OR = 5, PREC_AND = 6, PREC_NOT = 7, PREC_COMPARE = 8, PREC_SUM = 9, PREC_PROD = 10, PREC_PERCENT = 11, PREC_COLON = 12, PREC_SIGN = 13, PREC_POWER = 14, PREC_DOLLAR = 15, PREC_NS = 16, PREC_SUBSET = 17 }
	Precedence level of function.

Public Member Functions
int	arity () const
	'Arity' of the function.
void	checkNumArgs (const PairList args, const Expression call) const
	Report error if argument list is wrong length.
CCODE	function () const
	C/C++ function implementing this R function.
Kind	kind () const
	Kind of built-in function.
const char *	name () const
	Name of function.
unsigned int	offset () const
	Get table offset.
Precedence	precedence () const
	Precedence of built-in function.
int	printHandling () const
	(Not for general use.)
bool	rightAssociative () const
	Is a built-in function right-associative?
unsigned int	variant () const
	Index of variant behaviour.
bool	viaDotInternal () const
	Must this function be called via .Internal()?
const char *	typeName () const
	Name within R of this type of object.
RObject *	apply (ArgList arglist, Environment env, const Expression *call) const
	Apply the function.
Public Member Functions inherited from CXXR::FunctionBase
void	maybeTrace (const Expression *call) const
	Produce a tracing report if appropriate.
void	setTracing (bool on)
	Set tracing status.
bool	traced () const
	Is this function being traced?
Public Member Functions inherited from CXXR::RObject
virtual const PairList *	attributes () const
	Get object attributes.
virtual void	clearAttributes ()
	Remove all attributes.
virtual RObject *	clone () const
	Return pointer to a copy of this object.
void	copyAttribute (const Symbol name, const RObject source)
	Copy an attribute from one RObject to another.
void	copyAttributes (const RObject *source, bool copyS4)
	Copy attributes from one RObject to another.
virtual RObject *	evaluate (Environment *env)
	Evaluate object in a specified Environment.
virtual RObject *	getAttribute (const Symbol *name) const
	Get the value a particular attribute.
virtual bool	hasAttributes () const
	Has this object any attributes?
bool	hasClass () const
	Has this object the class attribute?
bool	isS4Object () const
	Is this an S4 object?
void	maybeTraceMemory (const RObject *src)
	Carry out memory tracing.
void	maybeTraceMemory (const RObject src1, const RObject src2)
	Carry out memory tracing.
void	maybeTraceMemory (const RObject src1, const RObject src2, const RObject *src3)
	Carry out memory tracing.
bool	memoryTraced () const
	Is copying etc. of this object being traced?
virtual unsigned int	packGPBits () const
	Reproduce the `gp` bits field used in CR.
virtual void	setAttribute (const Symbol name, RObject value)
	Set or remove an attribute.
void	setAttributes (const PairList *new_attributes)
	Replace the attributes of an object.
void	setMemoryTracing (bool on)
	Enable/disable tracing of copying etc.
void	setS4Object (bool on)
	Set the status of this RObject as an S4 object.
SEXPTYPE	sexptype () const
	Get an object's SEXPTYPE.
virtual void	unpackGPBits (unsigned int gpbits)
	Interpret the `gp` bits field used in CR.
void	detachReferents ()
	Null out all references from this node to other nodes.
void	visitReferents (const_visitor *v) const
	Conduct a visitor to the nodes referred to by this one.
Public Member Functions inherited from CXXR::GCNode
void	expose () const
	Record that construction of a node is complete.
bool	isExposed () const
	Has this node been exposed to garbage collection?
Public Member Functions inherited from CXXR::HeterogeneousListBase::Link
	Link ()
	Default constructor.
	Link (HeterogeneousListBase *list)
	Appending constructor.
void	freeLink ()
	Detach Link from any list.

Static Public Member Functions
static BuiltInFunction *	obtain (const std::string &name)
	Get a pointer to a BuiltInFunction object.
static const char *	staticTypeName ()
	The names by which this type is known in R.
Static Public Member Functions inherited from CXXR::FunctionBase
static void	enableTracing (bool on)
	Enable/disable function tracing.
static bool	isA (const RObject *obj)
	Is an RObject a FunctionBase?
static bool	tracingEnabled ()
	If function tracing currently enabled?
Static Public Member Functions inherited from CXXR::RObject
template<class T >
static T *	clone (const T *pattern)
	Return a pointer to a copy of an object.
Static Public Member Functions inherited from CXXR::GCNode
static void *	operator new (size_t bytes)
	Allocate memory.
static void *	operator new (size_t, void *where)
	Placement new for GCNode.
static void	operator delete (void *p, size_t bytes)
	Deallocate memory.
static bool	check ()
	Integrity check.
template<class T >
static T *	expose (T *node)
	Record that construction of a node is complete.
static void	gc ()
	Initiate a garbage collection.
static void	gclite ()
	Lightweight garbage collection.
static void	maybeCheckExposed (const GCNode *node)
	Subject to configuration, check that a GCNode is exposed.
static size_t	numNodes ()
	Number of GCNode objects in existence.

Friends
class	boost::serialization::access
class	SchwarzCounter< BuiltInFunction >

Additional Inherited Members
Protected Member Functions inherited from CXXR::FunctionBase
	FunctionBase (SEXPTYPE stype)
	FunctionBase (const FunctionBase &pattern)
	Copy constructor.
Protected Member Functions inherited from CXXR::RObject
	RObject (SEXPTYPE stype=CXXSXP)
	RObject (const RObject &pattern)
	Copy constructor.
Protected Member Functions inherited from CXXR::GCNode
virtual	~GCNode ()
Protected Member Functions inherited from CXXR::HeterogeneousListBase::Link
virtual	~Link ()

Detailed Description

R function implemented within the interpreter.

A BuiltInFunction object represents an R function that is implemented within the interpreter by a function in C++ or C. These objects are of two kinds, according to whether the arguments passed to BuiltInFunction::apply() are evaluated before being passed on to the encapsulated C/C++ function (CR's BUILTINSXP), or are passed on unevaluated (SPECIALSXP).

A BuiltInFunction object is implemented essentially as an offset into a table of function information, which in CXXR is a private static member (s_function_table) of this class.

Member Function Documentation

RObject* CXXR::BuiltInFunction::apply	(	ArgList *	arglist,
		Environment *	env,
		const Expression *	call
	)		const

virtual

Apply the function.

Parameters:

arglist	Non-null pointer to the ArgList containing the list of arguments with which the function is to be invoked.
env	Pointer to the Environment in which the function is to be evaluated.
call	Pointer to the Expression calling the function.

Returns:: The result of applying the function.

Implements CXXR::FunctionBase.

int CXXR::BuiltInFunction::arity ( ) const

inline

'Arity' of the function.

Returns:: The number of arguments expected by the function. A return value of -1 signifies that any number of arguments is acceptable.

void CXXR::BuiltInFunction::checkNumArgs	(	const PairList *	args,
		const Expression *	call
	)		const

Report error if argument list is wrong length.

This function raises an error if args is not of a permissible length for all call to this BuiltInFunction.

Parameters:

args	Argument list to be checked, possibly null.
call	The call being processed (for error reporting).

Note:: This would be called checkArity(), except that in code inherited from CR this would get macro-expanded to Rf_checkArityCall.

CCODE CXXR::BuiltInFunction::function ( ) const

inline

C/C++ function implementing this R function.

Returns:: Pointer to the C/C++ function implementing this R function.

Kind CXXR::BuiltInFunction::kind ( ) const

inline

Kind of built-in function.

(Used mainly in deparsing.)

Returns:: The Kind of the function.

const char* CXXR::BuiltInFunction::name ( ) const

inline

Name of function.

Returns:: The textual name of this function.

static BuiltInFunction* CXXR::BuiltInFunction::obtain ( const std::string & name )

static

Get a pointer to a BuiltInFunction object.

If name is not the name of a built-in function this function will raise a warning and return a null pointer. Otherwise the function will return a pointer to the (unique) BuiltInFunction object embodying that function. If no such object already exists, one will be created.

Parameters:

name	The name of the built-in function.

Returns:: a pointer to the BuiltInFunction object representing the function with the specified name, or a null pointer if name is not the name of a built-in function.

Note:: The reason this function raises a warning and not an error if passed an inappropriate name is so that loading an archive will not fail completely simply because it refers to an obsolete built-in function.

unsigned int CXXR::BuiltInFunction::offset ( ) const

inline

Get table offset.

Returns:: The offset into the table of functions.

Precedence CXXR::BuiltInFunction::precedence ( ) const

inline

Precedence of built-in function.

Returns:: The Precedence of the function.

int CXXR::BuiltInFunction::printHandling ( ) const

inline

(Not for general use.)

This function is used to implement PRIMPRINT, and is likely to be removed in future refactorisation.

Returns:: Code for handling R_Visible within the function, as documented in names.cpp for the eval field of the function table.

bool CXXR::BuiltInFunction::rightAssociative ( ) const

inline

Is a built-in function right-associative?

Returns:: true iff the function is right-associative.

static const char* CXXR::BuiltInFunction::staticTypeName ( )

inlinestatic

The names by which this type is known in R.

Returns:: The names by which this type is known in R.

Reimplemented from CXXR::FunctionBase.

const char* CXXR::BuiltInFunction::typeName ( ) const

virtual

Name within R of this type of object.

Returns:: the name by which this type of object is known within R.

Reimplemented from CXXR::RObject.

unsigned int CXXR::BuiltInFunction::variant ( ) const

inline

Index of variant behaviour.

Where a single C/C++ function implements more than one built-in R function, this function provides the C/C++ code with an index indicating which R function is to be implemented.

Returns:: index of the required behaviour; interpretation is up to the C/C++ function called.

bool CXXR::BuiltInFunction::viaDotInternal ( ) const

inline

Must this function be called via .Internal()?

Returns:: true iff this function must be called via .Internal()?

The documentation for this class was generated from the following file:

BuiltInFunction.h ($Id: BuiltInFunction.h 1390 2013-06-11 14:41:41Z arr $)

Public Types

Public Member Functions

Static Public Member Functions

Friends

Additional Inherited Members

Detailed Description

Member Function Documentation