Class OperandValueSolver
java.lang.Object
ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver<OperandValue>
ghidra.app.plugin.assembler.sleigh.expr.OperandValueSolver
Solves expressions of an operand value
These are a sort of named sub-expression, but they may also specify a shift in encoding.
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Field Summary
Fields inherited from class ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver
dbg, solver
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionstatic PatternExpression
Obtains the "defining expression"int
Determines the length of the subconstructor that would be returned had the expression not depended on an undefined symbol.getValue
(OperandValue ov, Map<String, Long> vals, AssemblyResolvedPatterns cur) Attempt to get a constant value for the expressionsolve
(AbstractAssemblyResolutionFactory<?, ?> factory, OperandValue ov, MaskedLong goal, Map<String, Long> vals, AssemblyResolvedPatterns cur, Set<SolverHint> hints, String description) Attempt to solve an expression for a given valuevalueForResolution
(OperandValue ov, Map<String, Long> vals, AssemblyResolvedPatterns rc) Compute the value of the expression given the (possibly-intermediate) resolutionMethods inherited from class ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver
register
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Constructor Details
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OperandValueSolver
public OperandValueSolver()
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Method Details
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getDefiningExpression
Obtains the "defining expression"This is either the symbol's assigned defining expression, or the expression associated with its defining symbol.
- Returns:
- the defining expression, or null if neither is available
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solve
public AssemblyResolution solve(AbstractAssemblyResolutionFactory<?, ?> factory, OperandValue ov, MaskedLong goal, Map<String, throws NeedsBackfillExceptionLong> vals, AssemblyResolvedPatterns cur, Set<SolverHint> hints, String description) Description copied from class:AbstractExpressionSolver
Attempt to solve an expression for a given value- Specified by:
solve
in classAbstractExpressionSolver<OperandValue>
- Parameters:
ov
- the expression to solvegoal
- the desired value of the expressionvals
- values of defined symbolshints
- describes techniques applied by calling solversdescription
- the description to give to resolved solutions- Returns:
- the resolution
- Throws:
NeedsBackfillException
- if the expression refers to an undefined symbol
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getValue
public MaskedLong getValue(OperandValue ov, Map<String, Long> vals, AssemblyResolvedPatterns cur) throws NeedsBackfillExceptionDescription copied from class:AbstractExpressionSolver
Attempt to get a constant value for the expression- Specified by:
getValue
in classAbstractExpressionSolver<OperandValue>
- Parameters:
ov
- the expressionvals
- 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
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getInstructionLength
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 classAbstractExpressionSolver<OperandValue>
- Parameters:
ov
- the expression- Returns:
- the length of filled in token field(s).
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valueForResolution
public MaskedLong valueForResolution(OperandValue ov, 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 classAbstractExpressionSolver<OperandValue>
- Parameters:
ov
- the expression to evaluatevals
- values of defined symbolsrc
- the resolution on which to evaluate it- Returns:
- the result
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