ROSE  0.9.9.109
Public Member Functions | Static Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::SValue Class Reference

Description

Type of values manipulated by the concrete domain.

Values of type type are used whenever a value needs to be stored, such as memory addresses, the values stored at those addresses, the values stored in registers, the operands for RISC operations, and the results of those operations. Each value has a known size and known bits. All RISC operations on these values will produce a new known value. This type is not capable of storing an undefined value, and any attempt to create an undefined value will create a value with all bits cleared instead.

Definition at line 41 of file ConcreteSemantics2.h.

#include <ConcreteSemantics2.h>

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Public Member Functions

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 bottom_ (size_t nbits) const ROSE_OVERRIDE
 Data-flow bottom value. More...
 
virtual BaseSemantics::SValuePtr number_ (size_t nbits, uint64_t value) const ROSE_OVERRIDE
 Create a new concrete semantic value. More...
 
virtual BaseSemantics::SValuePtr boolean_ (bool value) const ROSE_OVERRIDE
 Create a new, Boolean 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::SValuePtrcreateOptionalMerge (const BaseSemantics::SValuePtr &other, const BaseSemantics::MergerPtr &, SMTSolver *) const ROSE_OVERRIDE
 Possibly create a new value by merging two existing values. More...
 
virtual bool may_equal (const BaseSemantics::SValuePtr &other, SMTSolver *solver=NULL) const ROSE_OVERRIDE
 Returns true if two values could be equal. More...
 
virtual bool must_equal (const BaseSemantics::SValuePtr &other, SMTSolver *solver=NULL) const ROSE_OVERRIDE
 Returns true if two values must be equal. More...
 
virtual void set_width (size_t nbits) ROSE_OVERRIDE
 Accessor for value width.
 
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 void print (std::ostream &, BaseSemantics::Formatter &) const ROSE_OVERRIDE
 Print a value to a stream using default format. More...
 
virtual const Sawyer::Container::BitVectorbits () const
 Returns the bit vector storing the concrete value.
 
virtual void bits (const Sawyer::Container::BitVector &)
 Returns the bit vector storing the concrete value.
 
- Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue
SValuePtr createMerged (const SValuePtr &other, const MergerPtr &merger, SMTSolver *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.
 
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...
 
SharedObjectoperator= (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 value. More...
 
static SValuePtr instance (size_t nbits)
 Instantiate a new undefined value of specified width. More...
 
static SValuePtr instance (size_t nbits, uint64_t value)
 Instantiate a new concrete value. More...
 
static SValuePtr promote (const BaseSemantics::SValuePtr &v)
 Promote a base value to a SymbolicSemantics 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 SynchronizedPoolAllocatorpoolAllocator ()
 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)
 
 SValue (size_t nbits, uint64_t number)
 
- 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)
 

Protected Attributes

Sawyer::Container::BitVector bits_
 
- Protected Attributes inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue
size_t width
 

Additional Inherited Members

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

Member Function Documentation

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::SValue::instance ( )
inlinestatic

Instantiate a new prototypical value.

Prototypical values are only used for their virtual constructors.

Definition at line 59 of file ConcreteSemantics2.h.

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

Referenced by boolean_(), bottom_(), Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::RiscOperators::instance(), number_(), undefined_(), and unspecified_().

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

Instantiate a new undefined value of specified width.

This semantic domain has no representation for an undefined values–all values are defined. Therefore any attempt to create an undefined value will result in all bits being set to zero instead.

Definition at line 67 of file ConcreteSemantics2.h.

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

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::SValue::instance ( size_t  nbits,
uint64_t  value 
)
inlinestatic

Instantiate a new concrete value.

Definition at line 72 of file ConcreteSemantics2.h.

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

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::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 79 of file ConcreteSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::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 82 of file ConcreteSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::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 85 of file ConcreteSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::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 88 of file ConcreteSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::SValue::boolean_ ( bool  value) const
inlinevirtual

Create a new, Boolean value.

The new semantic value will have the same dynamic type as the value on which this virtual method is called. This is how 1-bit flag register values (among others) are created. The base implementation uses number_() to construct a 1-bit value whose bit is zero (false) or one (true).

Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::SValue.

Definition at line 91 of file ConcreteSemantics2.h.

References instance().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::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 94 of file ConcreteSemantics2.h.

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

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

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.

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::SValue::promote ( const BaseSemantics::SValuePtr v)
inlinestatic

Promote a base value to a SymbolicSemantics value.

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

Definition at line 107 of file ConcreteSemantics2.h.

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

virtual bool Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::SValue::may_equal ( const BaseSemantics::SValuePtr other,
SMTSolver solver = NULL 
) const
virtual

Returns true if two values could be equal.

The SMT solver is optional for many subclasses.

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

virtual bool Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::SValue::must_equal ( const BaseSemantics::SValuePtr other,
SMTSolver solver = NULL 
) const
virtual

Returns true if two values must be equal.

The SMT solver is optional for many subclasses.

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

virtual bool Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::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 121 of file ConcreteSemantics2.h.

virtual bool Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::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 125 of file ConcreteSemantics2.h.

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

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.

virtual void Rose::BinaryAnalysis::InstructionSemantics2::ConcreteSemantics::SValue::print ( std::ostream &  ,
BaseSemantics::Formatter  
) const
virtual

Print a value to a stream using default format.

The value will normally occupy a single line and not contain leading space or line termination. See also, with_format().

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


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