Class TrivialMethodEscape

java.lang.Object

com.ibm.wala.escape.TrivialMethodEscape

All Implemented Interfaces:

IMethodEscapeAnalysis, INodeEscapeAnalysis

public class TrivialMethodEscape
extends Object
implements IMethodEscapeAnalysis, INodeEscapeAnalysis

Trivial method-level escape analysis.

An instance does not escape from method m if the following hold:

1. the instance is only ever pointed to by locals (it is never stored in the heap)
2. the method m does NOT return (either normally or exceptionally) a pointer to the instance

Constructor Summary

Constructors

Constructor	Description
TrivialMethodEscape(CallGraph cg, HeapGraph<InstanceKey> hg)

Method Summary

Modifier and Type	Method	Description
boolean	mayEscape(CGNode allocNode, int allocPC, CGNode node)
boolean	mayEscape(MethodReference allocMethod, int allocPC, MethodReference m)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

TrivialMethodEscape

public TrivialMethodEscape(CallGraph cg,
 HeapGraph<InstanceKey> hg)

Parameters:

cg - governing call graph

hg - Heap graph representation of pointer analysis

Method Details

mayEscape

public boolean mayEscape(MethodReference allocMethod,
 int allocPC,
 MethodReference m)
                  throws WalaException

Specified by:

mayEscape in interface IMethodEscapeAnalysis

Parameters:

allocMethod - a method which holds an allocation site

allocPC - bytecode index of allocation site

m - method in question

Returns:

true if an object allocated at the allocation site <allocMethod,allocPC> may escape from an activation of method m, false otherwise

Throws:

WalaException

mayEscape

public boolean mayEscape(CGNode allocNode,
 int allocPC,
 CGNode node)
                  throws WalaException

Specified by:

mayEscape in interface INodeEscapeAnalysis

Parameters:

allocNode - a CGNode which holds an allocation site

allocPC - bytecode index of allocation site

node - method in question

Returns:

true if an object allocated at the allocation site <allocMethod,allocPC> may escape from an activation of node m, false otherwise

Throws:

WalaException