Package it.unive.lisa.program.cfg.statement

Class BinaryExpression

java.lang.Object

it.unive.lisa.program.cfg.statement.Statement

it.unive.lisa.program.cfg.statement.Expression

it.unive.lisa.program.cfg.statement.NaryExpression

it.unive.lisa.program.cfg.statement.BinaryExpression

All Implemented Interfaces:

ProgramPoint, CodeElement, CodeNode<CFG,Statement,Edge>, Node<CFG,Statement,Edge>, java.lang.Comparable<Statement>

Direct Known Subclasses:

Assignment

public abstract class BinaryExpression
extends NaryExpression

An NaryExpression with exactly two sub-expressions.

Field Summary

Fields inherited from class it.unive.lisa.program.cfg.statement.Statement

offset

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BinaryExpression(CFG cfg, CodeLocation location, java.lang.String constructName, EvaluationOrder order, Expression left, Expression right)	Builds the untyped expression, happening at the given location in the program.
protected	BinaryExpression(CFG cfg, CodeLocation location, java.lang.String constructName, EvaluationOrder order, Type staticType, Expression left, Expression right)	Builds the expression, happening at the given location in the program.
protected	BinaryExpression(CFG cfg, CodeLocation location, java.lang.String constructName, Expression left, Expression right)	Builds the untyped expression, happening at the given location in the program.
protected	BinaryExpression(CFG cfg, CodeLocation location, java.lang.String constructName, Type staticType, Expression left, Expression right)	Builds the expression, happening at the given location in the program.

Method Summary

Modifier and Type	Method	Description
<A extends AbstractState<A>> AnalysisState<A>	backwardSemanticsAux(InterproceduralAnalysis<A> interprocedural, AnalysisState<A> state, ExpressionSet[] params, StatementStore<A> expressions)	Computes the backward semantics of the expression, after the semantics of all sub-expressions have been computed.
<A extends AbstractState<A>> AnalysisState<A>	bwdBinarySemantics(InterproceduralAnalysis<A> interprocedural, AnalysisState<A> state, SymbolicExpression left, SymbolicExpression right, StatementStore<A> expressions)	Computes the backward semantics of the expression, after the semantics of the sub-expressions have been computed.
<A extends AbstractState<A>> AnalysisState<A>	forwardSemanticsAux(InterproceduralAnalysis<A> interprocedural, AnalysisState<A> state, ExpressionSet[] params, StatementStore<A> expressions)	Computes the forward semantics of the expression, after the semantics of all sub-expressions have been computed.
abstract <A extends AbstractState<A>> AnalysisState<A>	fwdBinarySemantics(InterproceduralAnalysis<A> interprocedural, AnalysisState<A> state, SymbolicExpression left, SymbolicExpression right, StatementStore<A> expressions)	Computes the forward semantics of the expression, after the semantics of the sub-expressions have been computed.
Expression	getLeft()	Yields the left-most (first) sub-expression of this expression.
Expression	getRight()	Yields the right-most (second) sub-expression of this expression.

Methods inherited from class it.unive.lisa.program.cfg.statement.NaryExpression

accept, backwardSemantics, equals, forwardSemantics, getConstructName, getOrder, getStatementEvaluatedAfter, getStatementEvaluatedBefore, getSubExpressions, hashCode, setOffset, toString

Methods inherited from class it.unive.lisa.program.cfg.statement.Expression

getMetaVariables, getParentStatement, getRootStatement, getStaticType, setParentStatement

Methods inherited from class it.unive.lisa.program.cfg.statement.Statement

compareTo, getCFG, getEvaluationPredecessor, getEvaluationSuccessor, getLocation, getOffset, stopsExecution, throwsError

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unive.lisa.program.cfg.ProgramPoint

getProgram

Constructor Detail

BinaryExpression

protected BinaryExpression(CFG cfg,
                           CodeLocation location,
                           java.lang.String constructName,
                           Expression left,
                           Expression right)

Builds the untyped expression, happening at the given location in the program. The static type of this expression is Untyped. The EvaluationOrder is LeftToRightEvaluation.

Parameters:

cfg - the cfg that this expression belongs to

location - the location where the expression is defined within the program

constructName - the name of the construct represented by this expression

left - the first sub-expression of this expression

right - the second sub-expression of this expression

BinaryExpression

protected BinaryExpression(CFG cfg,
                           CodeLocation location,
                           java.lang.String constructName,
                           Type staticType,
                           Expression left,
                           Expression right)

Builds the expression, happening at the given location in the program. The EvaluationOrder is LeftToRightEvaluation.

Parameters:

cfg - the cfg that this expression belongs to

location - the location where this expression is defined within the program

constructName - the name of the construct invoked by this expression

staticType - the static type of this expression

left - the first sub-expression of this expression

right - the second sub-expression of this expression

BinaryExpression

protected BinaryExpression(CFG cfg,
                           CodeLocation location,
                           java.lang.String constructName,
                           EvaluationOrder order,
                           Expression left,
                           Expression right)

Builds the untyped expression, happening at the given location in the program. The static type of this expression is Untyped.

Parameters:

cfg - the cfg that this expression belongs to

location - the location where the expression is defined within the program

constructName - the name of the construct represented by this expression

order - the evaluation order of the sub-expressions

left - the first sub-expression of this expression

right - the second sub-expression of this expression

BinaryExpression

protected BinaryExpression(CFG cfg,
                           CodeLocation location,
                           java.lang.String constructName,
                           EvaluationOrder order,
                           Type staticType,
                           Expression left,
                           Expression right)

Builds the expression, happening at the given location in the program.

Parameters:

cfg - the cfg that this expression belongs to

location - the location where this expression is defined within the program

constructName - the name of the construct invoked by this expression

order - the evaluation order of the sub-expressions

staticType - the static type of this expression

left - the first sub-expression of this expression

right - the second sub-expression of this expression

Method Detail

getLeft

public Expression getLeft()

Yields the left-most (first) sub-expression of this expression.

Returns:

the left-most sub-expression

getRight

public Expression getRight()

Yields the right-most (second) sub-expression of this expression.

Returns:

the right-most sub-expression

forwardSemanticsAux

public <A extends AbstractState<A>> AnalysisState<A> forwardSemanticsAux(InterproceduralAnalysis<A> interprocedural,
                                                                         AnalysisState<A> state,
                                                                         ExpressionSet[] params,
                                                                         StatementStore<A> expressions)
                                                                  throws SemanticException

Description copied from class: NaryExpression

Computes the forward semantics of the expression, after the semantics of all sub-expressions have been computed. Meta variables from the sub-expressions will be forgotten after this call returns.

Specified by:

forwardSemanticsAux in class NaryExpression

Type Parameters:

A - the type of AbstractState

Parameters:

interprocedural - the interprocedural analysis of the program to analyze

state - the state where the expression is to be evaluated

params - the symbolic expressions representing the computed values of the sub-expressions of this expression

expressions - the cache where analysis states of intermediate expressions are stored and that can be accessed to query for post-states of parameters expressions

Returns:

the AnalysisState representing the abstract result of the execution of this expression

Throws:

SemanticException - if something goes wrong during the computation

fwdBinarySemantics

public abstract <A extends AbstractState<A>> AnalysisState<A> fwdBinarySemantics(InterproceduralAnalysis<A> interprocedural,
                                                                                 AnalysisState<A> state,
                                                                                 SymbolicExpression left,
                                                                                 SymbolicExpression right,
                                                                                 StatementStore<A> expressions)
                                                                          throws SemanticException

Computes the forward semantics of the expression, after the semantics of the sub-expressions have been computed. Meta variables from the sub-expressions will be forgotten after this expression returns.

Type Parameters:

A - the type of AbstractState

Parameters:

interprocedural - the interprocedural analysis of the program to analyze

state - the state where the expression is to be evaluated

left - the symbolic expression representing the computed value of the first sub-expression of this expression

right - the symbolic expression representing the computed value of the second sub-expression of this expression

expressions - the cache where analysis states of intermediate expressions are stored and that can be accessed to query for post-states of parameters expressions

Returns:

the AnalysisState representing the abstract result of the execution of this expression

Throws:

SemanticException - if something goes wrong during the computation

backwardSemanticsAux

public <A extends AbstractState<A>> AnalysisState<A> backwardSemanticsAux(InterproceduralAnalysis<A> interprocedural,
                                                                          AnalysisState<A> state,
                                                                          ExpressionSet[] params,
                                                                          StatementStore<A> expressions)
                                                                   throws SemanticException

Description copied from class: NaryExpression

Computes the backward semantics of the expression, after the semantics of all sub-expressions have been computed. Meta variables from the sub-expressions will be forgotten after this call returns. By default, this method delegates to NaryExpression.forwardSemanticsAux(InterproceduralAnalysis, AnalysisState, ExpressionSet[], StatementStore), as it is fine for most atomic statements. One should redefine this method if a statement's semantics is composed of a series of smaller operations.

Overrides:

backwardSemanticsAux in class NaryExpression

Type Parameters:

A - the type of AbstractState

Parameters:

interprocedural - the interprocedural analysis of the program to analyze

state - the state where the expression is to be evaluated

params - the symbolic expressions representing the computed values of the sub-expressions of this expression

expressions - the cache where analysis states of intermediate expressions are stored and that can be accessed to query for post-states of parameters expressions

Returns:

the AnalysisState representing the abstract result of the execution of this expression

Throws:

SemanticException - if something goes wrong during the computation

bwdBinarySemantics

public <A extends AbstractState<A>> AnalysisState<A> bwdBinarySemantics(InterproceduralAnalysis<A> interprocedural,
                                                                        AnalysisState<A> state,
                                                                        SymbolicExpression left,
                                                                        SymbolicExpression right,
                                                                        StatementStore<A> expressions)
                                                                 throws SemanticException

Computes the backward semantics of the expression, after the semantics of the sub-expressions have been computed. Meta variables from the sub-expressions will be forgotten after this expression returns. By default, this method delegates to fwdBinarySemantics(InterproceduralAnalysis, AnalysisState, SymbolicExpression, SymbolicExpression, StatementStore), as it is fine for most atomic statements. One should redefine this method if a statement's semantics is composed of a series of smaller operations.

Type Parameters:

A - the type of AbstractState

Parameters:

interprocedural - the interprocedural analysis of the program to analyze

state - the state where the expression is to be evaluated

left - the symbolic expression representing the computed value of the first sub-expression of this expression

right - the symbolic expression representing the computed value of the second sub-expression of this expression

expressions - the cache where analysis states of intermediate expressions are stored and that can be accessed to query for post-states of parameters expressions

Returns:

the AnalysisState representing the abstract result of the execution of this expression

Throws:

SemanticException - if something goes wrong during the computation