Package org.apache.bcel.verifier.statics
Class Pass3aVerifier
java.lang.Object
org.apache.bcel.verifier.PassVerifier
org.apache.bcel.verifier.statics.Pass3aVerifier
This PassVerifier verifies a class file according to pass 3, static part as described in The Java Virtual Machine
Specification, 2nd edition. More detailed information is to be found at the do_verify() method's documentation.
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprivate final class
This visitor class does the actual checking for the instruction operand's constraints. -
Field Summary
FieldsModifier and TypeFieldDescriptionprivate Code
The one and only Code object used by an instance of this class.private InstructionList
The one and only InstructionList object used by an instance of this class.private final int
The method number to verify.private final Verifier
The Verifier that created this. -
Constructor Summary
ConstructorsConstructorDescriptionPass3aVerifier
(Verifier verifier, int methodNo) Should only be instantiated by a Verifier. -
Method Summary
Modifier and TypeMethodDescriptionprivate static boolean
contains
(int[] ints, int i) A small utility method returning if a given int i is in the given int[] ints.private void
These are the checks that could be done in pass 2 but are delayed to pass 3 for performance reasons.Pass 3a is the verification of static constraints of JVM code (such as legal targets of branch instructions).int
Returns the method number as supplied when instantiating.private void
These are the checks if constraints are satisfied which are described in the Java Virtual Machine Specification, Second Edition as Static Constraints on the instructions of Java Virtual Machine Code (chapter 4.8.1).private void
These are the checks for the satisfaction of constraints which are described in the Java Virtual Machine Specification, Second Edition as Static Constraints on the operands of instructions of Java Virtual Machine Code (chapter 4.8.1).protected String
This method is a slightly modified version of verifier.statics.StringRepresentation.toString(final Node obj) that accepts any Object, not just a Node.Methods inherited from class org.apache.bcel.verifier.PassVerifier
addMessage, getMessages, getMessagesList, verify
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Field Details
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verifier
The Verifier that created this. -
methodNo
private final int methodNoThe method number to verify. This is the index in the array returned by JavaClass.getMethods(). -
instructionList
The one and only InstructionList object used by an instance of this class. It's here for performance reasons by do_verify() and its callees. -
code
The one and only Code object used by an instance of this class. It's here for performance reasons by do_verify() and its callees.
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Constructor Details
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Pass3aVerifier
Should only be instantiated by a Verifier.
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Method Details
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contains
private static boolean contains(int[] ints, int i) A small utility method returning if a given int i is in the given int[] ints. -
delayedPass2Checks
private void delayedPass2Checks()These are the checks that could be done in pass 2 but are delayed to pass 3 for performance reasons. Also, these checks need access to the code array of the Code attribute of a Method so it's okay to perform them here. Also see the description of the do_verify() method.- Throws:
ClassConstraintException
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do_verify
Pass 3a is the verification of static constraints of JVM code (such as legal targets of branch instructions). This is the part of pass 3 where you do not need data flow analysis. JustIce also delays the checks for a correct exception table of a Code attribute and correct line number entries in a LineNumberTable attribute of a Code attribute (which conceptually belong to pass 2) to this pass. Also, most of the check for valid local variable entries in a LocalVariableTable attribute of a Code attribute is delayed until this pass. All these checks need access to the code array of the Code attribute.- Specified by:
do_verify
in classPassVerifier
- Returns:
- The VerificationResult
- Throws:
InvalidMethodException
- if the method to verify does not exist.
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getMethodNo
public int getMethodNo()Returns the method number as supplied when instantiating. -
pass3StaticInstructionChecks
private void pass3StaticInstructionChecks()These are the checks if constraints are satisfied which are described in the Java Virtual Machine Specification, Second Edition as Static Constraints on the instructions of Java Virtual Machine Code (chapter 4.8.1).- Throws:
StaticCodeConstraintException
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pass3StaticInstructionOperandsChecks
private void pass3StaticInstructionOperandsChecks()These are the checks for the satisfaction of constraints which are described in the Java Virtual Machine Specification, Second Edition as Static Constraints on the operands of instructions of Java Virtual Machine Code (chapter 4.8.1). BCEL parses the code array to create an InstructionList and therefore has to check some of these constraints. Additional checks are also implemented here.- Throws:
StaticCodeConstraintException
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tostring
This method is a slightly modified version of verifier.statics.StringRepresentation.toString(final Node obj) that accepts any Object, not just a Node. Returns the String representation of the Object obj; this is obj.toString() if it does not throw any RuntimeException, or else it is a string derived only from obj's class name.
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