Package it.unive.lisa.symbolic.heap

Class HeapExpression

java.lang.Object

it.unive.lisa.symbolic.SymbolicExpression

it.unive.lisa.symbolic.heap.HeapExpression

Direct Known Subclasses:

AccessChild, HeapAllocation, HeapDereference, HeapReference

public abstract class HeapExpression
extends SymbolicExpression

A symbolic expression that identifies a location in the program's heap. Instances of this expressions must be rewritten by HeapDomains to a ValueExpression before being evaluated from a ValueDomain.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	HeapExpression(ExternalSet<Type> types, CodeLocation location)	Builds the heap expression.

Method Summary

Modifier and Type	Method	Description
SymbolicExpression	popScope(ScopeToken token)	Pops the scope identified by the given token from the expression.
SymbolicExpression	pushScope(ScopeToken token)	Pushes a new scope, identified by the give token, in the expression.

Methods inherited from class it.unive.lisa.symbolic.SymbolicExpression

accept, equals, getCodeLocation, getDynamicType, getTypes, hashCode, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

HeapExpression

protected HeapExpression(ExternalSet<Type> types,
                         CodeLocation location)

Builds the heap expression.

Parameters:

types - the runtime types of this expression

location - the code location of the statement that has generated this heap expression

Method Detail

pushScope

public final SymbolicExpression pushScope(ScopeToken token)

Description copied from class: SymbolicExpression

Pushes a new scope, identified by the give token, in the expression. This causes all Variables to become OutOfScopeIdentifiers associated with the given token.

Specified by:

pushScope in class SymbolicExpression

Parameters:

token - the token identifying the scope to push

Returns:

a copy of this expression where the local variables have gone out of scope

popScope

public final SymbolicExpression popScope(ScopeToken token)
                                  throws SemanticException

Description copied from class: SymbolicExpression

Pops the scope identified by the given token from the expression. This causes all the invisible variables (i.e. OutOfScopeIdentifiers) mapped to the given scope to become visible (i.e. Variables) again.

Specified by:

popScope in class SymbolicExpression

Parameters:

token - the token of the scope to be restored

Returns:

a copy of this expression where the local variables associated with the given scope are visible again

Throws:

SemanticException - if an error occurs during the computation