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## Package org.apache.bcel.verifier.structurals

Provides a PassVerifier class mostly used internally by JustIce, yielding a control flow graph for public use as a nice side effect.

See:
Description

Interface Summary
InstructionContext | An InstructionContext offers convenient access to information like control flow successors and such.
Subroutine | This interface defines properties of JVM bytecode subroutines.

Class Summary
ControlFlowGraph | This class represents a control flow graph of a method.
ExceptionHandler | This class represents an exception handler; that is, an ObjectType representing a subclass of java.lang.Throwable and the instruction the handler starts off (represented by an InstructionContext).
ExceptionHandlers | This class allows easy access to ExceptionHandler objects.
ExecutionVisitor | This Visitor class may be used for a type-based Java Virtual Machine simulation.
Frame | This class represents a JVM execution frame; that means, a local variable array and an operand stack.
GenericArray | A placeholder class that can be used to create an ObjectType of which has some of the properties arrays have.
InstConstraintVisitor | A Visitor class testing for valid preconditions of JVM instructions.
LocalVariables | This class implements an array of local variables used for symbolic JVM simulation.
OperandStack | This class implements a stack used for symbolic JVM stack simulation.
Pass3bVerifier | This PassVerifier verifies a method of class file according to pass 3, so-called structural verification as described in The Java Virtual Machine Specification, 2nd edition.
Subroutines | Instances of this class contain information about the subroutines found in a code array of a method.
UninitializedObjectType | This class represents an uninitialized object type; see The Java Virtual Machine Specification, Second Edition, page 147: 4.9.4 for more details.

## Package org.apache.bcel.verifier.structurals Description

Provides a PassVerifier class mostly used internally by JustIce, yielding a control flow graph for public use as a nice side effect.

## Package Specification

Contained in this package is a PassVerifier class for use with the JustIce verifier and its utility classes. Only the pass performing what Sun calls "Structural Constraints on Java Virtual Machine Code" has a PassVerifier class here. JustIce calls this pass "Pass 3b".

## Related Documentation

For a simple demonstration of JustIce working, please see:

- A WWW front-end for JustIce.

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