Package it.unive.lisa.program.language.parameterassignment

Interface ParameterAssigningStrategy

All Known Implementing Classes:

OrderPreservingAssigningStrategy, PythonLikeAssigningStrategy

public interface ParameterAssigningStrategy

A strategy for assigning parameters at call sites. Depending on the language, assignments from actual to formal parameters might happen in the same order as they are evaluated, or they might happen with a by-name semantics, where the name of a parameter is prefixed to the expression representing the value to be assigned to it. The latter semantics enables parameter shuffling. Each strategy comes with a different prepare(Call, AnalysisState, InterproceduralAnalysis, StatementStore, Parameter[], ExpressionSet[]) implementation that can automatically perform the assignments.

Method Summary

Modifier and Type	Method	Description
<A extends AbstractState<A>> org.apache.commons.lang3.tuple.Pair<AnalysisState<A>,ExpressionSet[]>	prepare(Call call, AnalysisState<A> callState, InterproceduralAnalysis<A> interprocedural, StatementStore<A> expressions, Parameter[] formals, ExpressionSet[] actuals)	Prepares the entryState for the targets of the given Call, assuming that the state when the call is executed (after the evaluation of the parameters) is callState, and each parameter to the call is represented by an element of parameters.

Method Detail

prepare

<A extends AbstractState<A>> org.apache.commons.lang3.tuple.Pair<AnalysisState<A>,ExpressionSet[]> prepare(Call call,
                                                                                                                 AnalysisState<A> callState,
                                                                                                                 InterproceduralAnalysis<A> interprocedural,
                                                                                                                 StatementStore<A> expressions,
                                                                                                                 Parameter[] formals,
                                                                                                                 ExpressionSet[] actuals)
                                                                                                          throws SemanticException

Prepares the entryState for the targets of the given Call, assuming that the state when the call is executed (after the evaluation of the parameters) is callState, and each parameter to the call is represented by an element of parameters. Here, no restrictions on the order of the parameters is made: they can be passed as-is, preserving their evaluation order (Java-like), or they may be passed by-name (Python-like).

Type Parameters:

A - the type of AbstractState

Parameters:

call - the call to be prepared

callState - the analysis state where the call is to be executed

interprocedural - the interprocedural analysis of the program to analyze

expressions - the cache where analysis states of intermediate expressions must be stored

formals - the expressions representing the formal parameters of the call

actuals - the expressions representing the actual parameters of the call

Returns:

the prepared state, ready to be used as entry-state for the targets, and the expressions to use as parameters of the call

Throws:

SemanticException - if something goes wrong while preparing the entry-state