Description

Values in the NullSemantics domain.

Values are essentially void.

Definition at line 25 of file NullSemantics2.h.

#include <NullSemantics2.h>

Inheritance diagram for Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue:

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Collaboration diagram for Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue:

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Public Member Functions
virtual BaseSemantics::SValuePtr	bottom_ (size_t nBits) const ROSE_OVERRIDE
	Data-flow bottom value. More...

virtual BaseSemantics::SValuePtr	undefined_ (size_t nBits) const ROSE_OVERRIDE
	Create a new undefined semantic value. More...

virtual BaseSemantics::SValuePtr	unspecified_ (size_t nBits) const ROSE_OVERRIDE
	Create a new unspecified semantic value. More...

virtual BaseSemantics::SValuePtr	number_ (size_t nBits, uint64_t number) const ROSE_OVERRIDE
	Create a new concrete semantic value. More...

virtual BaseSemantics::SValuePtr	copy (size_t new_width=0) const ROSE_OVERRIDE
	Create a new value from an existing value, changing the width if `new_width` is non-zero. More...

virtual Sawyer::Optional< BaseSemantics::SValuePtr >	createOptionalMerge (const BaseSemantics::SValuePtr &other, const BaseSemantics::MergerPtr &, const SmtSolverPtr &) const ROSE_OVERRIDE
	Possibly create a new value by merging two existing values. More...

virtual bool	isBottom () const ROSE_OVERRIDE
	Determines whether a value is a data-flow bottom. More...

virtual bool	is_number () const ROSE_OVERRIDE
	Determines if the value is a concrete number. More...

virtual uint64_t	get_number () const ROSE_OVERRIDE
	Return the concrete number for this value. More...

virtual bool	may_equal (const BaseSemantics::SValuePtr &other, const SmtSolverPtr &solver=SmtSolverPtr()) const ROSE_OVERRIDE
	Returns true if two values could be equal. More...

virtual bool	must_equal (const BaseSemantics::SValuePtr &other, const SmtSolverPtr &solver=SmtSolverPtr()) const ROSE_OVERRIDE
	Returns true if two values must be equal. More...

virtual void	print (std::ostream &stream, BaseSemantics::Formatter &) const ROSE_OVERRIDE
	Print a value to a stream using default format. More...

Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue
virtual SValuePtr	boolean_ (bool value) const
	Create a new, Boolean value. More...

SValuePtr	createMerged (const SValuePtr &other, const MergerPtr &merger, const SmtSolverPtr &solver) const
	Create a new value by merging two existing values. More...

bool	isTrue () const
	Returns true if concrete non-zero. More...

bool	isFalse () const
	Returns true if concrete zero. More...

virtual size_t	get_width () const
	Accessor for value width.

virtual void	set_width (size_t nbits)
	Accessor for value width.

void	print (std::ostream &stream) const
	Print a value to a stream using default format. More...

WithFormatter	with_format (Formatter &fmt)
	Used for printing values with formatting. More...

WithFormatter	operator+ (Formatter &fmt)
	Used for printing values with formatting. More...

virtual std::string	get_comment () const
	Some subclasses support the ability to add comments to values. More...

virtual void	set_comment (const std::string &) const
	Some subclasses support the ability to add comments to values. More...

Public Member Functions inherited from Sawyer::SharedObject
	SharedObject ()
	Default constructor. More...

	SharedObject (const SharedObject &)
	Copy constructor. More...

virtual	~SharedObject ()
	Virtual destructor. More...

SharedObject &	operator= (const SharedObject &)
	Assignment. More...

Public Member Functions inherited from Sawyer::SharedFromThis< SValue >
SharedPointer< SValue >	sharedFromThis ()
	Create a shared pointer from `this`. More...

SharedPointer< const SValue >	sharedFromThis () const
	Create a shared pointer from `this`. More...

Static Public Member Functions
static SValuePtr	instance ()
	Instantiate a new prototypical values. More...

static SValuePtr	instance (size_t nbits)
	Instantiate a new undefined value. More...

static SValuePtr	instance (size_t nbits, uint64_t number)
	Instantiate a new concrete value. More...

static SValuePtr	instance (const SValuePtr &other)
	Instantiate a new copy of an existing value. More...

static SValuePtr	promote (const BaseSemantics::SValuePtr &v)
	Promote a base value to a NullSemantics value. More...

Static Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue
static SValuePtr	promote (const SValuePtr &x)

Static Public Member Functions inherited from Sawyer::SmallObject
static SynchronizedPoolAllocator &	poolAllocator ()
	Return the pool allocator for this class. More...

static void *	operator new (size_t size)

static void	operator delete (void *ptr, size_t size)

Protected Member Functions
	SValue (size_t nbits)

Protected Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue
	SValue ()
	Width of the value in bits. More...

	SValue (size_t nbits)

	SValue (const SValue &other)

Additional Inherited Members
Public Types inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue
typedef SValuePtr	Ptr
	Shared-ownership pointer for an SValue object. More...

Protected Attributes inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue
size_t	width

Member Function Documentation

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::instance ( )

inlinestatic

Instantiate a new prototypical values.

Prototypical values are only used for their virtual constructors.

Definition at line 36 of file NullSemantics2.h.

References Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue::SValue().

Referenced by bottom_(), number_(), undefined_(), and unspecified_().

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::instance ( size_t nbits )

inlinestatic

Instantiate a new undefined value.

Definition at line 41 of file NullSemantics2.h.

References Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue::SValue().

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::instance	(	size_t	nbits,
		uint64_t	number
	)

inlinestatic

Instantiate a new concrete value.

Definition at line 46 of file NullSemantics2.h.

References Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue::SValue().

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::instance ( const SValuePtr & other )

inlinestatic

Instantiate a new copy of an existing value.

Definition at line 51 of file NullSemantics2.h.

References Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue::SValue().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::bottom_ ( size_t nBits ) const

inlinevirtual

Data-flow bottom value.

Returns a new value that represents bottom in a data-flow analysis. If a semantic domain can represent a bottom value then the isBottom predicate is true when invoked on this method's return value. If a semantic domain cannot support a bottom value, then it may return some other value.

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 58 of file NullSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::undefined_ ( size_t nbits ) const

inlinevirtual

Create a new undefined semantic value.

The new semantic value will have the same dynamic type as the value on which this virtual method is called. This is the most common way that a new value is created. The unspecified_ method is closely related.

See also: unspecified_

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 61 of file NullSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::unspecified_ ( size_t nbits ) const

inlinevirtual

Create a new unspecified semantic value.

The new semantic value will have the same dynamic type as the value on which this virtual method is called. Undefined (undefined_) and unspecified are closely related. Unspecified values are the same as undefined values except they're instantiated as the result of some machine instruction where the ISA documentation indicates that the value is unspecified (e.g., status flags for x86 shift and rotate instructions).

Most semantic domains make no distinction between undefined and unspecified.

See also: undefined_

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 64 of file NullSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::number_	(	size_t	nbits,
		uint64_t	number
	)		const

inlinevirtual

Create a new concrete semantic value.

The new value will represent the specified concrete value and have the same dynamic type as the value on which this virtual method is called. This is the most common way that a new constant is created. The number is truncated to contain nbits bits (higher order bits are cleared).

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 67 of file NullSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::copy ( size_t new_width = 0 ) const

inlinevirtual

Create a new value from an existing value, changing the width if new_width is non-zero.

Increasing the width logically adds zero bits to the most significant side of the value; decreasing the width logically removes bits from the most significant side of the value.

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 70 of file NullSemantics2.h.

References Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue::SValue().

virtual Sawyer::Optional<BaseSemantics::SValuePtr> Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::createOptionalMerge	(	const BaseSemantics::SValuePtr &	other,
		const BaseSemantics::MergerPtr &	merger,
		const SmtSolverPtr &	solver
	)		const

inlinevirtual

Possibly create a new value by merging two existing values.

This method optionally returns a new semantic value as the data-flow merge of this and other. If the two inputs are "equal" in some sense of the dataflow implementation then nothing is returned, otherwise a new value is returned. Typical usage is like this:

 if (SValuePtr merged = v1->createOptionalMerge(v2).orDefault()) {
     std::cout <<"v1 and v2 were merged to " <<*merged <<"\n";
 } else {
     std::cout <<"no merge is necessary\n";
 }
 or
@code
 SValuePtr merge;
 if (v1->createOptionalMerge(v2).assignTo(merged)) {
     std::cout <<"v1 and v2 were merged to " <<*merged <<"\n";
 } else {
     std::cout <<"v1 and v2 are equal in some sense (no merge necessary)\n";
 }

If you always want a copy regardless of whether the merge is necessary, then use the createMerged convenience function instead.

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 77 of file NullSemantics2.h.

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::promote ( const BaseSemantics::SValuePtr & v )

inlinestatic

Promote a base value to a NullSemantics value.

The value v must have a NullSemantics::SValue dynamic type.

Definition at line 86 of file NullSemantics2.h.

References Sawyer::SharedPointer< T >::dynamicCast().

virtual bool Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::isBottom ( ) const

inlinevirtual

Determines whether a value is a data-flow bottom.

Returns true if this value represents a bottom value for data-flow analysis. Any RiscOperation performed on an operand whose isBottom predicate returns true will itself return a bottom value. This includes operations like "xor x x" which would normally return zero.

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 95 of file NullSemantics2.h.

virtual bool Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::is_number ( ) const

inlinevirtual

Determines if the value is a concrete number.

Concrete numbers can be created with the number_(), boolean_() virtual constructors, or by other means.

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 99 of file NullSemantics2.h.

virtual uint64_t Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::get_number ( ) const

inlinevirtual

Return the concrete number for this value.

Only values for which is_number() returns true are able to return a concrete value by this method.

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 103 of file NullSemantics2.h.

virtual bool Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::may_equal	(	const BaseSemantics::SValuePtr &	other,
		const SmtSolverPtr &	solver = `SmtSolverPtr()`
	)		const

inlinevirtual

Returns true if two values could be equal.

The SMT solver is optional for many subclasses.

Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 109 of file NullSemantics2.h.

virtual bool Rose::BinaryAnalysis::InstructionSemantics2::NullSemantics::SValue::must_equal	(	const BaseSemantics::SValuePtr &	other,
		const SmtSolverPtr &	solver = `SmtSolverPtr()`
	)		const