PassVerifierpublic abstract class PassVerifier extends Object | A PassVerifier actually verifies a class file; it is instantiated
by a Verifier.
The verification should conform with a certain pass as described
in The Java Virtual Machine Specification, 2nd edition.
This book describes four passes. Pass one means loading the
class and verifying a few static constraints. Pass two actually
verifies some other constraints that could enforce loading in
referenced class files. Pass three is the first pass that actually
checks constraints in the code array of a method in the class file;
it has two parts with the first verifying static constraints and
the second part verifying structural constraints (where a data flow
analysis is used for). The fourth pass, finally, performs checks
that can only be done at run-time.
JustIce does not have a run-time pass, but certain constraints that
are usually delayed until run-time for performance reasons are also
checked during the second part of pass three.
PassVerifier instances perform caching.
That means, if you really want a new verification run of a certain
pass you must use a new instance of a given PassVerifier. |
| Fields Summary |
|---|
| private ArrayList | messagesThe (warning) messages. | | private VerificationResult | verificationResultThe VerificationResult cache. |
| Methods Summary |
|---|
| public void | addMessage(java.lang.String message)This method adds a (warning) message to the message pool of this
PassVerifier. This method is normally only internally used by
BCEL's class file verifier "JustIce" and should not be used from
the outside.
messages.add(message);
| | public abstract VerificationResult | do_verify()Does the real verification work, uncached.
| | public java.lang.String[] | getMessages()Returns the (warning) messages that this PassVerifier accumulated
during its do_verify()ing work.
verify(); // create messages if not already done (cached!)
String[] ret = new String[messages.size()];
for (int i=0; i<messages.size(); i++){
ret[i] = (String) messages.get(i);
}
return ret;
| | public VerificationResult | verify()This method runs a verification pass conforming to the
Java Virtual Machine Specification, 2nd edition, on a
class file.
PassVerifier instances perform caching;
i.e. if the verify() method once determined a VerificationResult,
then this result may be returned after every invocation of this
method instead of running the verification pass anew; likewise with
the result of getMessages().
if (verificationResult == null){
verificationResult = do_verify();
}
return verificationResult;
|
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