Package ghidra.app.plugin.assembler.sleigh.expr

Class AbstractUnaryExpressionSolver<T extends UnaryExpression>

java.lang.Object

ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver<T>

ghidra.app.plugin.assembler.sleigh.expr.AbstractUnaryExpressionSolver<T>

Type Parameters:

T - the type of expression solved (the operator)

Direct Known Subclasses:

MinusExpressionSolver, NotExpressionSolver

public abstract class AbstractUnaryExpressionSolver<T extends UnaryExpression>
extends AbstractExpressionSolver<T>

A solver that handles expressions of the form [OP]A

Field Summary

Fields inherited from class ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver

dbg, solver

Constructor Summary

Constructors

Constructor	Description
AbstractUnaryExpressionSolver(Class<T> tcls)

Method Summary

Modifier and Type	Method	Description
abstract MaskedLong	compute(MaskedLong val)	Compute the result of applying the operator to the given value
MaskedLong	computeInverse(MaskedLong goal)	Compute the input value given that the result is known
int	getInstructionLength(T exp)	Determines the length of the subconstructor that would be returned had the expression not depended on an undefined symbol.
MaskedLong	getValue(T exp, Map<String,Long> vals, AssemblyResolvedPatterns cur)	Attempt to get a constant value for the expression
AssemblyResolution	solve(AbstractAssemblyResolutionFactory<?,?> factory, T exp, MaskedLong goal, Map<String,Long> vals, AssemblyResolvedPatterns cur, Set<SolverHint> hints, String description)	Attempt to solve an expression for a given value
MaskedLong	valueForResolution(T exp, Map<String,Long> vals, AssemblyResolvedPatterns rc)	Compute the value of the expression given the (possibly-intermediate) resolution

Methods inherited from class ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver

register

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AbstractUnaryExpressionSolver

public AbstractUnaryExpressionSolver(Class<T> tcls)

Method Details

solve

public AssemblyResolution solve(AbstractAssemblyResolutionFactory<?,?> factory,
 T exp,
 MaskedLong goal,
 Map<String,Long> vals,
 AssemblyResolvedPatterns cur,
 Set<SolverHint> hints,
 String description)
                         throws NeedsBackfillException

Description copied from class: AbstractExpressionSolver

Attempt to solve an expression for a given value

Specified by:

solve in class AbstractExpressionSolver<T extends UnaryExpression>

exp - the expression to solve

goal - the desired value of the expression

vals - values of defined symbols

hints - describes techniques applied by calling solvers

description - the description to give to resolved solutions

Returns:

the resolution

Throws:

NeedsBackfillException - if the expression refers to an undefined symbol

getValue

public MaskedLong getValue(T exp,
 Map<String,Long> vals,
 AssemblyResolvedPatterns cur)
                    throws NeedsBackfillException

Description copied from class: AbstractExpressionSolver

Attempt to get a constant value for the expression

Specified by:

getValue in class AbstractExpressionSolver<T extends UnaryExpression>

Parameters:

exp - the expression

vals - values of defined symbols

Returns:

the constant value, or null if it depends on a variable

Throws:

NeedsBackfillException - if the expression refers to an undefined symbol

computeInverse

public MaskedLong computeInverse(MaskedLong goal)

Compute the input value given that the result is known

NOTE: Assumes an involution by default

Parameters:

goal - the result

Returns:

the input value solution

compute

public abstract MaskedLong compute(MaskedLong val)

Compute the result of applying the operator to the given value

Parameters:

val - the input value

Returns:

the result

getInstructionLength

public int getInstructionLength(T exp)

Description copied from class: AbstractExpressionSolver

Determines the length of the subconstructor that would be returned had the expression not depended on an undefined symbol.

This is used by the backfilling process to ensure values are written to the correct offset

Specified by:

getInstructionLength in class AbstractExpressionSolver<T extends UnaryExpression>

Parameters:

exp - the expression

Returns:

the length of filled in token field(s).

valueForResolution

public MaskedLong valueForResolution(T exp,
 Map<String,Long> vals,
 AssemblyResolvedPatterns rc)

Description copied from class: AbstractExpressionSolver

Compute the value of the expression given the (possibly-intermediate) resolution

Specified by:

valueForResolution in class AbstractExpressionSolver<T extends UnaryExpression>

Parameters:

exp - the expression to evaluate

vals - values of defined symbols

rc - the resolution on which to evaluate it

Returns:

the result