https://issues.apache.org/bugzilla/show_bug.cgi?id=52441
Bug #: 52441
Summary: InstructionTargeters not being properly cleaned up.
Product: BCEL
Version: 5.3
Platform: PC
OS/Version: Linux
Status: NEW
Severity: minor
Priority: P2
Component: Main
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Created attachment 28127
--> https://issues.apache.org/bugzilla/attachment.cgi?id=28127
New method to InstructionTargeter for target cleanup.
It seems that InstructionTargeters are not being properly cleaned up when they
are not used anymore. That is, when a targeter is replaced or removed (e.g., a
LocalVariableGen is removed from a method), the targeter remains in the
targeters list of its targets.
For example, MethodGen's constructor which receives a Method uses its other
constructor to initialize the object:
public MethodGen(Method m, String class_name, ConstantPoolGen cp) {
this(
m.getAccessFlags(),
Type.getReturnType(m.getSignature()),
Type.getArgumentTypes(m.getSignature()),
null /* may be overridden anyway */,
m.getName(),
class_name,
((m.getAccessFlags() & (Constants.ACC_ABSTRACT | Constants.ACC_NATIVE))
== 0) ? new InstructionList(m.getCode().getCode()) : null, cp);
...
}
Because this call passes null as its 4th argument, the constructor will create
placeholder LocalVariableGen for the arguments (like arg0, arg1, etc). Later in
this constructor the arguments will be overridden (as indicated by the
comment). However, the LocalVariableGens of the placeholder arguments (as well
as the LocalVariableGen for the "this" variable) will remain in the targeter
lists of the first and last instructions of the instruction list.
To avoid this problem I am submitting a patch in attachment. It adds a new
method to InstructionTargeter:
/**
* Removes all targets of this targeter.
*/
void removeTargets();
and implements it to remove the targeter from the target's lists. The patch
also calls removeTargets() when discarding targeters in MethodGen.
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