ROSE  0.11.145.0
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Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue Class Reference

Description

Semantic values for generating static semantic ASTs.

Each SValue has a pointer to a partly-constructed AST. In general, the parent pointers in these AST nodes are not initialized because many of these nodes are being shared across multiple subtrees. ROSE's instruction semantics framework relies very heavily on node sharing, but the AST was not designed for this. Do not expect AST traversals and analysis to work correctly for ASTs pointed to by an SValue. But never fear, the SValue's AST will be fixed when it's actually attached to an instruction node.

Definition at line 75 of file StaticSemantics.h.

#include <Rose/BinaryAnalysis/InstructionSemantics/StaticSemantics.h>

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Public Types

using Super = BaseSemantics::SValue
 Base type. More...
 
using Ptr = SValuePtr
 Shared-ownership pointer. More...
 
- Public Types inherited from Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::SValue
using Ptr = SValuePtr
 Shared-ownership pointer. More...
 

Public Member Functions

virtual BaseSemantics::SValuePtr bottom_ (size_t nbits) const override
 Data-flow bottom value. More...
 
virtual BaseSemantics::SValuePtr undefined_ (size_t nbits) const override
 Create a new undefined semantic value. More...
 
virtual BaseSemantics::SValuePtr unspecified_ (size_t nbits) const override
 Create a new unspecified semantic value. More...
 
virtual BaseSemantics::SValuePtr number_ (size_t nbits, uint64_t value) const override
 Create a new concrete semantic value. More...
 
virtual BaseSemantics::SValuePtr boolean_ (bool value) const override
 Create a new, Boolean value. More...
 
virtual BaseSemantics::SValuePtr copy (size_t new_width=0) const 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 &, const BaseSemantics::MergerPtr &, const SmtSolverPtr &) const override
 Possibly create a new value by merging two existing values. More...
 
virtual bool may_equal (const BaseSemantics::SValuePtr &, const SmtSolverPtr &=SmtSolverPtr()) const override
 Virtual API. More...
 
virtual bool must_equal (const BaseSemantics::SValuePtr &, const SmtSolverPtr &=SmtSolverPtr()) const override
 Virtual API. More...
 
virtual void set_width (size_t) override
 Virtual API. More...
 
virtual bool isBottom () const override
 Determines whether a value is a data-flow bottom. More...
 
virtual bool is_number () const override
 Virtual API. More...
 
virtual uint64_t get_number () const override
 Virtual API. More...
 
virtual void hash (Combinatorics::Hasher &) const override
 Hash this semantic value. More...
 
virtual void print (std::ostream &, BaseSemantics::Formatter &) const override
 Print a value to a stream using default format. More...
 
virtual SgAsmExpressionast ()
 Property: Abstract syntax tree.
 
virtual void ast (SgAsmExpression *x)
 Property: Abstract syntax tree.
 
- Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::SValue
SValuePtr createMerged (const SValuePtr &other, const MergerPtr &merger, const SmtSolverPtr &solver) const
 Create a new value by merging two existing values. More...
 
size_t nBits () const
 Property: value width. More...
 
bool isConcrete () const
 Determines if the value is a concrete number. More...
 
Sawyer::Optional< uint64_t > toUnsigned () const
 Converts a concrete value to a native unsigned integer. More...
 
Sawyer::Optional< int64_t > toSigned () const
 Converts a concrete value to a native signed integer. More...
 
bool mustEqual (const SValuePtr &other, const SmtSolverPtr &solver=SmtSolverPtr()) const
 Tests two values for equality. More...
 
bool mayEqual (const SValuePtr &other, const SmtSolverPtr &solver=SmtSolverPtr()) const
 Tests two values for possible equality. More...
 
bool isTrue () const
 Returns true if concrete non-zero. More...
 
bool isFalse () const
 Returns true if concrete zero. More...
 
std::string toString () const
 Render this symbolic expression as a string. More...
 
std::string comment () const
 Property: Comment. More...
 
void comment (const std::string &) const
 Property: Comment. More...
 
void print (std::ostream &) 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...
 
WithFormatter operator+ (const std::string &linePrefix)
 Used for printing values with formatting. More...
 
virtual size_t get_width () const
 Virtual API. 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 prototypical SValue. More...
 
static SValuePtr instance_bottom (size_t nbits)
 Instantiate a data-flow bottom value. More...
 
static SValuePtr instance_undefined (size_t nbits)
 Instantiate an undefined value. More...
 
static SValuePtr instance_unspecified (size_t nbits)
 Instantiate an unspecified value. More...
 
static SValuePtr instance_integer (size_t nbits, uint64_t value)
 Instantiate an integer constant. More...
 
static SValuePtr promote (const BaseSemantics::SValuePtr &v)
 Promote a base value to a static semantics value. More...
 
- Static Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::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, SgAsmRiscOperation::RiscOperator op)
 
 SValue (size_t nbits, uint64_t number)
 
 SValue (const SValue &other)
 
- Protected Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::SValue
 SValue (size_t nbits)
 
 SValue (const SValue &other)
 

Protected Attributes

SgAsmExpressionast_
 
- Protected Attributes inherited from Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::SValue
size_t width
 

Member Typedef Documentation

Base type.

Definition at line 78 of file StaticSemantics.h.

Shared-ownership pointer.

Definition at line 81 of file StaticSemantics.h.

Member Function Documentation

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::instance ( )
inlinestatic

Instantiate a prototypical SValue.

This SValue will be used only for its virtual constructors and will never appear in an expression.

Definition at line 109 of file StaticSemantics.h.

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::instance_bottom ( size_t  nbits)
inlinestatic

Instantiate a data-flow bottom value.

Definition at line 114 of file StaticSemantics.h.

Referenced by bottom_().

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::instance_undefined ( size_t  nbits)
inlinestatic

Instantiate an undefined value.

Undefined values end up being a SgAsmRiscOperation of type OP_undefined which has a single child which is an integer identification number. This allows two such nodes in the AST to be resolved to the same or different undefined value by virtue of their ID number.

Definition at line 123 of file StaticSemantics.h.

Referenced by undefined_().

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::instance_unspecified ( size_t  nbits)
inlinestatic

Instantiate an unspecified value.

Unspecified values end up being a SgAsmRiscOperation of type OP_unspecified which has a single child which is an integer identification number. This allows two such nodes in the AST to be resolved to the same or different unspecified value by virtue of their ID number.

Definition at line 132 of file StaticSemantics.h.

Referenced by unspecified_().

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::instance_integer ( size_t  nbits,
uint64_t  value 
)
inlinestatic

Instantiate an integer constant.

Definition at line 137 of file StaticSemantics.h.

Referenced by boolean_(), and number_().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::bottom_ ( size_t  nBits) const
inlineoverridevirtual

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::InstructionSemantics::BaseSemantics::SValue.

Definition at line 142 of file StaticSemantics.h.

References instance_bottom().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::undefined_ ( size_t  nbits) const
inlineoverridevirtual

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::InstructionSemantics::BaseSemantics::SValue.

Definition at line 145 of file StaticSemantics.h.

References instance_undefined().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::unspecified_ ( size_t  nbits) const
inlineoverridevirtual

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::InstructionSemantics::BaseSemantics::SValue.

Definition at line 148 of file StaticSemantics.h.

References instance_unspecified().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::number_ ( size_t  nbits,
uint64_t  number 
) const
inlineoverridevirtual

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::InstructionSemantics::BaseSemantics::SValue.

Definition at line 151 of file StaticSemantics.h.

References instance_integer().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::boolean_ ( bool  value) const
inlineoverridevirtual

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::InstructionSemantics::BaseSemantics::SValue.

Definition at line 154 of file StaticSemantics.h.

References instance_integer().

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::copy ( size_t  new_width = 0) const
inlineoverridevirtual

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::InstructionSemantics::BaseSemantics::SValue.

Definition at line 157 of file StaticSemantics.h.

virtual Sawyer::Optional<BaseSemantics::SValuePtr> Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::createOptionalMerge ( const BaseSemantics::SValuePtr other,
const BaseSemantics::MergerPtr merger,
const SmtSolverPtr solver 
) const
inlineoverridevirtual

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::InstructionSemantics::BaseSemantics::SValue.

Definition at line 164 of file StaticSemantics.h.

static SValuePtr Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::promote ( const BaseSemantics::SValuePtr v)
inlinestatic

Promote a base value to a static semantics value.

Definition at line 171 of file StaticSemantics.h.

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

virtual bool Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::may_equal ( const BaseSemantics::SValuePtr other,
const SmtSolverPtr solver = SmtSolverPtr() 
) const
inlineoverridevirtual

Virtual API.

See mayEqual.

Implements Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::SValue.

Definition at line 179 of file StaticSemantics.h.

virtual bool Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::must_equal ( const BaseSemantics::SValuePtr other,
const SmtSolverPtr solver = SmtSolverPtr() 
) const
inlineoverridevirtual

Virtual API.

See mustEqual.

Implements Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::SValue.

Definition at line 184 of file StaticSemantics.h.

virtual void Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::set_width ( size_t  nbits)
inlineoverridevirtual

Virtual API.

See nBits.

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

Definition at line 189 of file StaticSemantics.h.

virtual bool Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::isBottom ( ) const
inlineoverridevirtual

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::InstructionSemantics::BaseSemantics::SValue.

Definition at line 193 of file StaticSemantics.h.

virtual bool Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::is_number ( ) const
inlineoverridevirtual
virtual uint64_t Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::get_number ( ) const
inlineoverridevirtual
virtual void Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::hash ( Combinatorics::Hasher ) const
inlineoverridevirtual

Hash this semantic value.

Hashes the value by appending it to the specified hasher.

Implements Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::SValue.

Definition at line 205 of file StaticSemantics.h.

virtual void Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics::SValue::print ( std::ostream &  ,
BaseSemantics::Formatter  
) const
overridevirtual

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::InstructionSemantics::BaseSemantics::SValue.


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