Description

Dataflow RISC operators.

This is a MultiSemantics domain that contains a user-specified domain and a dataflow inner domain. The user-specified domain is used to calculate memory addresses, and the dataflow inner domain tracks dataflow across RISC operators (like the fact that if C = A + B then the definers for C are the union of the definers for A and B; or that if E = D xor D then E has no definers since it is a constant). State-accessing operations (reading and writing registers and memory) are handled above these two subdomains: read operations instantiate a value with a given set of definers, and write operations insert information into the final data flow graph.

Definition at line 65 of file DataFlowSemantics.h.

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

Inheritance diagram for Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators:

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Collaboration diagram for Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators:

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Public Types
using	Super = MultiSemantics::RiscOperators
	Base type.

using	Ptr = RiscOperatorsPtr
	Shared-ownership pointer.

Public Types inherited from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators
using	Super = BaseSemantics::RiscOperators
	Base type.

using	Ptr = RiscOperatorsPtr
	Shared-ownership pointer.

Public Types inherited from Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::RiscOperators
enum class	IteStatus { NEITHER , A , B , BOTH }
	Status for iteWithStatus operation. More...

using	Ptr = RiscOperatorsPtr
	Shared-ownership pointer.

Public Member Functions
void	clearGraph ()
	Clear dataflow graph.

const DataFlowGraph &	getGraph () const
	Return the dataflow graph.

virtual BaseSemantics::SValuePtr	readRegister (RegisterDescriptor reg, const BaseSemantics::SValuePtr &dflt) override
	Reads a value from a register.

virtual BaseSemantics::SValuePtr	peekRegister (RegisterDescriptor reg, const BaseSemantics::SValuePtr &dflt) override
	Obtain a register value without side effects.

virtual void	writeRegister (RegisterDescriptor reg, const BaseSemantics::SValuePtr &a_) override
	Writes a value to a register.

virtual BaseSemantics::SValuePtr	readMemory (RegisterDescriptor segreg, const BaseSemantics::SValuePtr &addr_, const BaseSemantics::SValuePtr &dflt_, const BaseSemantics::SValuePtr &cond) override
	Reads a value from memory.

virtual BaseSemantics::SValuePtr	peekMemory (RegisterDescriptor segreg, const BaseSemantics::SValuePtr &addr_, const BaseSemantics::SValuePtr &dflt_) override
	Read memory without side effects.

virtual void	writeMemory (RegisterDescriptor segreg, const BaseSemantics::SValuePtr &addr_, const BaseSemantics::SValuePtr &data_, const BaseSemantics::SValuePtr &cond) override
	Writes a value to memory.

Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators
virtual size_t	add_subdomain (const BaseSemantics::RiscOperatorsPtr &subdomain, const std::string &name, bool activate=true)
	Add a subdomain to this MultiSemantics domain.

virtual Formatter &	get_formatter ()
	Returns a formatter containing the names of the subdomains.

virtual size_t	nsubdomains () const
	Returns the number of subdomains added to this MultiDomain.

virtual BaseSemantics::RiscOperatorsPtr	get_subdomain (size_t idx) const
	Returns the RiscOperators for a subdomain.

virtual bool	is_active (size_t idx) const
	Returns true if a subdomain is active.

virtual void	clear_active (size_t idx)
	Makes a subdomain inactive.

virtual void	set_active (size_t idx, bool status)
	Makes a subdomain active or inactive.

virtual void	before (size_t)
	Called before each subdomain RISC operation.

virtual void	after (size_t)
	Called after each subdomain RISC operation.

virtual SValuePtr	svalue_empty (size_t nbits)
	Convenience function for SValue::create_empty().

virtual void	print (std::ostream &o, BaseSemantics::Formatter &) const override
	Print multi-line output for this object.

virtual void	startInstruction (SgAsmInstruction *insn) override
	Called at the beginning of every instruction.

virtual void	finishInstruction (SgAsmInstruction *insn) override
	Called at the end of every instruction.

virtual BaseSemantics::SValuePtr	undefined_ (size_t nbits) override
	Returns a new undefined value.

virtual BaseSemantics::SValuePtr	unspecified_ (size_t nbits) override
	Returns a new undefined value.

virtual BaseSemantics::SValuePtr	number_ (size_t nbits, uint64_t value) override
	Returns a number of the specified bit width.

virtual BaseSemantics::SValuePtr	boolean_ (bool) override
	Returns a Boolean value.

virtual BaseSemantics::SValuePtr	bottom_ (size_t nbits) override
	Returns a data-flow bottom value.

virtual BaseSemantics::SValuePtr	filterCallTarget (const BaseSemantics::SValuePtr &) override
	Invoked to filter call targets.

virtual BaseSemantics::SValuePtr	filterReturnTarget (const BaseSemantics::SValuePtr &) override
	Invoked to filter return targets.

virtual BaseSemantics::SValuePtr	filterIndirectJumpTarget (const BaseSemantics::SValuePtr &) override
	Invoked to filter indirect jumps.

virtual BaseSemantics::SValuePtr	and_ (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Computes bit-wise AND of two values.

virtual BaseSemantics::SValuePtr	or_ (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Computes bit-wise OR of two values.

virtual BaseSemantics::SValuePtr	xor_ (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Computes bit-wise XOR of two values.

virtual BaseSemantics::SValuePtr	invert (const BaseSemantics::SValuePtr &a) override
	One's complement.

virtual BaseSemantics::SValuePtr	extract (const BaseSemantics::SValuePtr &a, size_t begin_bit, size_t end_bit) override
	Extracts bits from a value.

virtual BaseSemantics::SValuePtr	concat (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Concatenates the bits of two values.

virtual BaseSemantics::SValuePtr	leastSignificantSetBit (const BaseSemantics::SValuePtr &a) override
	Returns position of least significant set bit; zero when no bits are set.

virtual BaseSemantics::SValuePtr	mostSignificantSetBit (const BaseSemantics::SValuePtr &a) override
	Returns position of most significant set bit; zero when no bits are set.

virtual BaseSemantics::SValuePtr	rotateLeft (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &nbits) override
	Rotate bits to the left.

virtual BaseSemantics::SValuePtr	rotateRight (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &nbits) override
	Rotate bits to the right.

virtual BaseSemantics::SValuePtr	shiftLeft (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &nbits) override
	Returns arg shifted left.

virtual BaseSemantics::SValuePtr	shiftRight (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &nbits) override
	Returns arg shifted right logically (no sign bit).

virtual BaseSemantics::SValuePtr	shiftRightArithmetic (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &nbits) override
	Returns arg shifted right arithmetically (with sign bit).

virtual BaseSemantics::SValuePtr	equalToZero (const BaseSemantics::SValuePtr &a) override
	Determines whether a value is equal to zero.

virtual BaseSemantics::SValuePtr	iteWithStatus (const BaseSemantics::SValuePtr &cond, const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b, IteStatus &) override
	If-then-else with status.

virtual BaseSemantics::SValuePtr	unsignedExtend (const BaseSemantics::SValuePtr &a, size_t new_width) override
	Extend (or shrink) operand `a` so it is `nbits` wide by adding or removing high-order bits.

virtual BaseSemantics::SValuePtr	signExtend (const BaseSemantics::SValuePtr &a, size_t new_width) override
	Sign extends a value.

virtual BaseSemantics::SValuePtr	add (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Adds two integers of equal size.

virtual BaseSemantics::SValuePtr	addWithCarries (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b, const BaseSemantics::SValuePtr &c, BaseSemantics::SValuePtr &carry_out) override
	Add two values of equal size and a carry bit.

virtual BaseSemantics::SValuePtr	negate (const BaseSemantics::SValuePtr &a) override
	Two's complement.

virtual BaseSemantics::SValuePtr	signedDivide (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Divides two signed values.

virtual BaseSemantics::SValuePtr	signedModulo (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Calculates modulo with signed values.

virtual BaseSemantics::SValuePtr	signedMultiply (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Multiplies two signed values.

virtual BaseSemantics::SValuePtr	unsignedDivide (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Divides two unsigned values.

virtual BaseSemantics::SValuePtr	unsignedModulo (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Calculates modulo with unsigned values.

virtual BaseSemantics::SValuePtr	unsignedMultiply (const BaseSemantics::SValuePtr &a, const BaseSemantics::SValuePtr &b) override
	Multiply two unsigned values.

virtual BaseSemantics::SValuePtr	fpFromInteger (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Construct a floating-point value from an integer value.

virtual BaseSemantics::SValuePtr	fpToInteger (const BaseSemantics::SValuePtr &, SgAsmFloatType *, const BaseSemantics::SValuePtr &) override
	Construct an integer value from a floating-point value.

virtual BaseSemantics::SValuePtr	fpConvert (const BaseSemantics::SValuePtr &, SgAsmFloatType , SgAsmFloatType ) override
	Convert from one floating-point type to another.

virtual BaseSemantics::SValuePtr	fpIsNan (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Whether a floating-point value is a special not-a-number bit pattern.

virtual BaseSemantics::SValuePtr	fpIsDenormalized (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Whether a floating-point value is denormalized.

virtual BaseSemantics::SValuePtr	fpIsZero (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Whether a floating-point value is equal to zero.

virtual BaseSemantics::SValuePtr	fpIsInfinity (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Whether a floating-point value is infinity.

virtual BaseSemantics::SValuePtr	fpSign (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Sign of floating-point value.

virtual BaseSemantics::SValuePtr	fpEffectiveExponent (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Exponent of floating-point value.

virtual BaseSemantics::SValuePtr	fpAdd (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Add two floating-point values.

virtual BaseSemantics::SValuePtr	fpSubtract (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Subtract one floating-point value from another.

virtual BaseSemantics::SValuePtr	fpMultiply (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Multiply two floating-point values.

virtual BaseSemantics::SValuePtr	fpDivide (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Divide one floating-point value by another.

virtual BaseSemantics::SValuePtr	fpSquareRoot (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Square root.

virtual BaseSemantics::SValuePtr	fpRoundTowardZero (const BaseSemantics::SValuePtr &, SgAsmFloatType *) override
	Round toward zero.

virtual BaseSemantics::SValuePtr	reinterpret (const BaseSemantics::SValuePtr &, SgAsmType *) override
	Reinterpret an expression as a different type.

Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::RiscOperators
virtual SValuePtr	protoval () const
	Property: Prototypical semantic value.

virtual void	hash (Combinatorics::Hasher &)
	Compute hash of current state.

virtual void	comment (const std::string &)
	Inject a line comment into debugging streams.

virtual void	hlt ()
	Invoked for the x86 HLT instruction.

virtual void	cpuid ()
	Invoked for the x86 CPUID instruction.

virtual SValuePtr	rdtsc ()
	Invoked for the x86 RDTSC instruction.

virtual std::pair< SValuePtr, SValuePtr >	split (const SValuePtr &a, size_t splitPoint)
	Split a value into two narrower values.

virtual SValuePtr	countLeadingZeros (const SValuePtr &a)
	Count leading zero bits.

virtual SValuePtr	countLeadingOnes (const SValuePtr &a)
	Count leading one bits.

virtual SValuePtr	reverseElmts (const SValuePtr &a, size_t elmtNBits)
	Reverse parts of a value.

virtual SValuePtr	ite (const SValuePtr &cond, const SValuePtr &a, const SValuePtr &b) final
	If-then-else.

virtual SValuePtr	addCarry (const SValuePtr &a, const SValuePtr &b, SValuePtr &carryOut, SValuePtr &overflowed)
	Adds two integers of equal size and carry.

virtual SValuePtr	subtract (const SValuePtr &minuend, const SValuePtr &subtrahend)
	Subtract one value from another.

virtual SValuePtr	subtractCarry (const SValuePtr &minuend, const SValuePtr &subtrahend, SValuePtr &carryOut, SValuePtr &overflowed)
	Subtract one value from another and carry.

virtual void	interrupt (int majorNumber, int minorNumber)
	Unconditionally raise an interrupt.

virtual void	interrupt (const SValuePtr &majr, const SValuePtr &minr, const SValuePtr &raise)
	Invoked for instructions that cause an interrupt.

virtual void	raiseInterrupt (unsigned majorNumber, unsigned minorNumber, const SValuePtr &raise)
	Conditionally raise an interrupt.

virtual SValuePtr	convert (const SValuePtr &a, SgAsmType srcType, SgAsmType dstType)
	Convert value from one type to another.

virtual SmtSolverPtr	solver () const
	Property: Satisfiability module theory (SMT) solver.

virtual void	solver (const SmtSolverPtr &s)
	Property: Satisfiability module theory (SMT) solver.

const HotPatch &	hotPatch () const
	Property: Post-instruction hot patches.

HotPatch &	hotPatch ()
	Property: Post-instruction hot patches.

void	hotPatch (const HotPatch &hp)
	Property: Post-instruction hot patches.

virtual StatePtr	currentState () const
	Property: Current semantic state.

virtual void	currentState (const StatePtr &s)
	Property: Current semantic state.

virtual StatePtr	initialState () const
	Property: Optional lazily updated initial state.

virtual void	initialState (const StatePtr &s)
	Property: Optional lazily updated initial state.

virtual const std::string &	name () const
	Property: Name used for debugging.

virtual void	name (const std::string &s)
	Property: Name used for debugging.

void	print (std::ostream &stream, const std::string prefix="") const
	Print multi-line output for this object.

WithFormatter	with_format (Formatter &fmt)
	Used for printing RISC operators with formatting.

WithFormatter	operator+ (Formatter &fmt)
	Used for printing RISC operators with formatting.

WithFormatter	operator+ (const std::string &linePrefix)
	Used for printing RISC operators with formatting.

virtual size_t	nInsns () const
	Property: Number of instructions processed.

virtual void	nInsns (size_t n)
	Property: Number of instructions processed.

virtual SgAsmInstruction *	currentInstruction () const
	Property: Current instruction.

virtual void	currentInstruction (SgAsmInstruction *insn)
	Property: Current instruction.

virtual bool	isNoopRead () const
	Property: No-op read.

virtual void	isNoopRead (bool b)
	Property: No-op read.

virtual SValuePtr	concatLoHi (const SValuePtr &lowBits, const SValuePtr &highBits)
	Aliases for concatenation.

virtual SValuePtr	concatHiLo (const SValuePtr &highBits, const SValuePtr &lowBits)
	Aliases for concatenation.

virtual SValuePtr	isEqual (const SValuePtr &a, const SValuePtr &b)
	Equality comparison.

virtual SValuePtr	isNotEqual (const SValuePtr &a, const SValuePtr &b)
	Equality comparison.

virtual SValuePtr	isUnsignedLessThan (const SValuePtr &a, const SValuePtr &b)
	Comparison for unsigned values.

virtual SValuePtr	isUnsignedLessThanOrEqual (const SValuePtr &a, const SValuePtr &b)
	Comparison for unsigned values.

virtual SValuePtr	isUnsignedGreaterThan (const SValuePtr &a, const SValuePtr &b)
	Comparison for unsigned values.

virtual SValuePtr	isUnsignedGreaterThanOrEqual (const SValuePtr &a, const SValuePtr &b)
	Comparison for unsigned values.

virtual SValuePtr	isSignedLessThan (const SValuePtr &a, const SValuePtr &b)
	Comparison for signed values.

virtual SValuePtr	isSignedLessThanOrEqual (const SValuePtr &a, const SValuePtr &b)
	Comparison for signed values.

virtual SValuePtr	isSignedGreaterThan (const SValuePtr &a, const SValuePtr &b)
	Comparison for signed values.

virtual SValuePtr	isSignedGreaterThanOrEqual (const SValuePtr &a, const SValuePtr &b)
	Comparison for signed values.

virtual SValuePtr	readRegister (RegisterDescriptor reg)
	Reads a value from a register.

SValuePtr	peekRegister (RegisterDescriptor reg)
	Obtain a register value without side effects.

Static Public Member Functions
static RiscOperatorsPtr	instance (const BaseSemantics::RiscOperatorsPtr &childOps)
	Static allocating constructor.

static RiscOperatorsPtr	promote (const BaseSemantics::RiscOperatorsPtr &x)
	Run-time promotion of a base RiscOperators pointer to operators for this domain.

Static Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators
static RiscOperatorsPtr	instanceFromRegisters (const RegisterDictionaryPtr &)
	Static allocating constructor.

static RiscOperatorsPtr	instanceFromProtoval (const BaseSemantics::SValuePtr &protoval, const SmtSolverPtr &solver=SmtSolverPtr())

static RiscOperatorsPtr	instanceFromState (const BaseSemantics::StatePtr &, const SmtSolverPtr &solver=SmtSolverPtr())

static RiscOperatorsPtr	promote (const BaseSemantics::RiscOperatorsPtr &ops)

Static Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::RiscOperators
static RiscOperatorsPtr	promote (const RiscOperatorsPtr &x)

Protected Member Functions
	RiscOperators (const BaseSemantics::RiscOperatorsPtr &userDomain)

BaseSemantics::SValuePtr	readOrPeekMemory (RegisterDescriptor segreg, const BaseSemantics::SValuePtr &addr, const BaseSemantics::SValuePtr &dflt, const BaseSemantics::SValuePtr &cond, bool allowSideEffects)

Protected Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators
	RiscOperators (const BaseSemantics::SValuePtr &protoval, const SmtSolverPtr &)

	RiscOperators (const BaseSemantics::StatePtr &, const SmtSolverPtr &)

Protected Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics::BaseSemantics::RiscOperators
	RiscOperators (const SValuePtr &protoval, const SmtSolverPtr &solver=SmtSolverPtr())

	RiscOperators (const StatePtr &state, const SmtSolverPtr &solver=SmtSolverPtr())

Additional Inherited Members
Protected Types inherited from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators
typedef std::vector< BaseSemantics::RiscOperatorsPtr >	Subdomains

Protected Attributes inherited from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators
Subdomains	subdomains

std::vector< bool >	active

Formatter	formatter

Member Typedef Documentation

◆ Super

using Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::Super = MultiSemantics::RiscOperators

Base type.

Definition at line 68 of file DataFlowSemantics.h.

◆ Ptr

using Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::Ptr = RiscOperatorsPtr

Shared-ownership pointer.

Definition at line 71 of file DataFlowSemantics.h.

Constructor & Destructor Documentation

◆ RiscOperators()

Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::RiscOperators ( const BaseSemantics::RiscOperatorsPtr & userDomain )

inlineexplicitprotected

Definition at line 83 of file DataFlowSemantics.h.

Member Function Documentation

◆ instance()

static RiscOperatorsPtr Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::instance ( const BaseSemantics::RiscOperatorsPtr & childOps )

inlinestatic

Static allocating constructor.

Constructs a semantic framework for discovering data flow. The caller provides a semantic domain that is used to identify memory locations. Any domain can be used, but usually a SymbolicSemantics domain works best.

Definition at line 93 of file DataFlowSemantics.h.

◆ promote()

static RiscOperatorsPtr Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::promote ( const BaseSemantics::RiscOperatorsPtr & x )

inlinestatic

Run-time promotion of a base RiscOperators pointer to operators for this domain.

This is a checked conversion–it will fail if x does not point to an object with appropriate dynamic type.

Definition at line 120 of file DataFlowSemantics.h.

◆ clearGraph()

void Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::clearGraph ( )

inline

Clear dataflow graph.

Clears the dataflow graph without affecting the user-supplied virtual machine state.

Definition at line 130 of file DataFlowSemantics.h.

References Sawyer::Container::Graph< V, E, VKey, EKey, Alloc >::clear().

◆ getGraph()

const DataFlowGraph & Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::getGraph ( ) const

inline

Return the dataflow graph.

Definition at line 133 of file DataFlowSemantics.h.

◆ readRegister()

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::readRegister	(	RegisterDescriptor	reg,
		const BaseSemantics::SValuePtr &	dflt
	)

overridevirtual

Reads a value from a register.

The base implementation simply delegates to the current semantic State, which probably delegates to a register state, but subclasses are welcome to override this behavior at any level.

A register state will typically implement storage for hardware registers, but higher layers (the State, RiscOperators, Dispatcher, ...) should not be concerned about the size of the register they're trying to read. For example, a register state for a 32-bit x86 architecture will likely have a storage location for the 32-bit EAX register, but it should be possible to ask readRegister to return the value of AX (the low-order 16-bits). In order to accomplish this, some level of the readRegister delegations needs to invoke extract to obtain the low 16 bits. The RiscOperators object is passed along the delegation path for this purpose. The inverse concat operation will be needed at some level when we ask readRegister to return a value that comes from multiple storage locations in the register state (such as can happen if an x86 register state holds individual status flags and we ask for the 32-bit EFLAGS register).

If the register state can distinguish between a register that has never been accessed and a register that has only been read, then the dflt value is stored into the register the first time it's read. This ensures that reading the register a second time with no intervening write will return the same value as the first read. If a dflt is not provided then one is constructed by invoking undefined_.

There needs to be a certain level of cooperation between the RiscOperators, State, and register state classes to decide which layer should invoke the extract or concat (or whatever other RISC operations might be necessary).

Reimplemented from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators.

◆ peekRegister()

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::peekRegister	(	RegisterDescriptor	,
		const BaseSemantics::SValuePtr &	dflt
	)

overridevirtual

Obtain a register value without side effects.

This is a lower-level operation than readRegister in that it doesn't cause the register to be marked as having been read. It is typically used in situations where the register is being accessed for analysis purposes rather than as part of an instruction emulation.

Reimplemented from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators.

◆ writeRegister()

virtual void Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::writeRegister	(	RegisterDescriptor	reg,
		const BaseSemantics::SValuePtr &	a
	)

overridevirtual

Writes a value to a register.

The base implementation simply delegates to the current semantic State, which probably delegates to a register state, but subclasses are welcome to override this behavior at any level.

As with readRegister, writeRegister may need to perform various RISC operations in order to accomplish the task of writing a value to the specified register when the underlying register state doesn't actually store a value for that specific register. The RiscOperations object is passed along for that purpose. See readRegister for more details.

Reimplemented from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators.

◆ readMemory()

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::readMemory	(	RegisterDescriptor	segreg,
		const BaseSemantics::SValuePtr &	addr,
		const BaseSemantics::SValuePtr &	dflt,
		const BaseSemantics::SValuePtr &	cond
	)

overridevirtual

Reads a value from memory.

The implementation (in subclasses) will typically delegate much of the work to the current state's readMemory method.

A MemoryState will implement storage for memory locations and might impose certain restrictions, such as "all memory values must be eight bits". However, the readMemory should not have these constraints so that it can be called from a variety of Dispatcher subclass (e.g., the DispatcherX86 class assumes that readMemory is capable of reading 32-bit values from little-endian memory). The designers of the MemoryState, State, and RiscOperators should collaborate to decide which layer (RiscOperators, State, or MemoryState) is reponsible for combining individual memory locations into larger values. A RiscOperators object is passed along the chain of delegations for this purpose. The RiscOperators might also contain other data that's important during the process, such as an SMT solver.

The segreg argument is an optional segment register. Most architectures have a flat virtual address space and will pass a default-constructed register descriptor whose is_valid() method returns false.

The cond argument is a Boolean value that indicates whether this is a true read operation. If cond can be proven to be false then the read is a no-op and returns an arbitrary value.

The dflt argument determines the size of the value to be read. This argument is also passed along to the lower layers so that they can, if they desire, use it to initialize memory that has never been read or written before.

Reimplemented from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators.

◆ peekMemory()

virtual BaseSemantics::SValuePtr Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::peekMemory	(	RegisterDescriptor	segreg,
		const BaseSemantics::SValuePtr &	addr,
		const BaseSemantics::SValuePtr &	dflt
	)

overridevirtual

Read memory without side effects.

This is a lower-level operation than readMemory in that it doesn't cause any side effects in the memory state. In all other respects, it's similar to readMemory.

Reimplemented from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators.

◆ writeMemory()

virtual void Rose::BinaryAnalysis::InstructionSemantics::DataFlowSemantics::RiscOperators::writeMemory	(	RegisterDescriptor	segreg,
		const BaseSemantics::SValuePtr &	addr,
		const BaseSemantics::SValuePtr &	data,
		const BaseSemantics::SValuePtr &	cond
	)

overridevirtual

Writes a value to memory.

The implementation (in subclasses) will typically delegate much of the work to the current state's writeMemory method.

The segreg argument is an optional segment register. Most architectures have a flat virtual address space and will pass a default-constructed register descriptor whose is_valid() method returns false.

The cond argument is a Boolean value that indicates whether this is a true write operation. If cond can be proved to be false then writeMemory is a no-op.

Reimplemented from Rose::BinaryAnalysis::InstructionSemantics::MultiSemantics::RiscOperators.

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

DataFlowSemantics.h

Description

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Member Typedef Documentation

◆ Super

◆ Ptr

Constructor & Destructor Documentation

◆ RiscOperators()

Member Function Documentation

◆ instance()

◆ promote()

◆ clearGraph()

◆ getGraph()

◆ readRegister()

◆ peekRegister()

◆ writeRegister()

◆ readMemory()

◆ peekMemory()

◆ writeMemory()