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

Class Next2InstructionValueSolver

java.lang.Object

ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver<Next2InstructionValue>

ghidra.app.plugin.assembler.sleigh.expr.Next2InstructionValueSolver

public class Next2InstructionValueSolver
extends AbstractExpressionSolver<Next2InstructionValue>

"Solves" expressions of inst_next2

Works like the constant solver, but takes the value of inst_next, which is given by the assembly address and the resulting instruction length.

NOTE: This solver requires backfill, since the value of inst_next2 is not known until possible prefixes have been considered.

Field Summary

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

dbg, solver

Constructor Summary

Constructors

Constructor	Description
Next2InstructionValueSolver()

Method Summary

Modifier and Type	Method	Description
int	getInstructionLength(Next2InstructionValue iv)	Determines the length of the subconstructor that would be returned had the expression not depended on an undefined symbol.
MaskedLong	getValue(Next2InstructionValue iv, Map<String,Long> vals, AssemblyResolvedPatterns cur)	Attempt to get a constant value for the expression
AssemblyResolution	solve(AbstractAssemblyResolutionFactory<?,?> factory, Next2InstructionValue 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(Next2InstructionValue 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

Next2InstructionValueSolver

public Next2InstructionValueSolver()

Method Details

solve

public AssemblyResolution solve(AbstractAssemblyResolutionFactory<?,?> factory,
 Next2InstructionValue 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<Next2InstructionValue>

Parameters:

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(Next2InstructionValue iv,
 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<Next2InstructionValue>

Parameters:

iv - 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

getInstructionLength

public int getInstructionLength(Next2InstructionValue iv)

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<Next2InstructionValue>

Parameters:

iv - the expression

Returns:

the length of filled in token field(s).

valueForResolution

public MaskedLong valueForResolution(Next2InstructionValue 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<Next2InstructionValue>

Parameters:

exp - the expression to evaluate

vals - values of defined symbols

rc - the resolution on which to evaluate it

Returns:

the result