Package org.apache.bcel.verifier.statics
Class Pass3aVerifier
- java.lang.Object
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- org.apache.bcel.verifier.PassVerifier
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- org.apache.bcel.verifier.statics.Pass3aVerifier
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public final class Pass3aVerifier extends PassVerifier
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.- See Also:
do_verify()
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Nested Class Summary
Nested Classes Modifier and Type Class Description private class
Pass3aVerifier.InstOperandConstraintVisitor
This visitor class does the actual checking for the instruction operand's constraints.
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Field Summary
Fields Modifier and Type Field Description private Code
code
The one and only Code object used by an instance of this class.private InstructionList
instructionList
The one and only InstructionList object used by an instance of this class.private int
methodNo
The method number to verify.private Verifier
verifier
The Verifier that created this.
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Constructor Summary
Constructors Constructor Description Pass3aVerifier(Verifier verifier, int methodNo)
Should only be instantiated by a Verifier.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description private 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
delayedPass2Checks()
These are the checks that could be done in pass 2 but are delayed to pass 3 for performance reasons.VerificationResult
do_verify()
Pass 3a is the verification of static constraints of JVM code (such as legal targets of branch instructions).int
getMethodNo()
Returns the method number as supplied when instantiating.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).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).protected java.lang.String
tostring(java.lang.Object obj)
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 Detail
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verifier
private final Verifier verifier
The Verifier that created this.
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methodNo
private final int methodNo
The method number to verify. This is the index in the array returned by JavaClass.getMethods().
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instructionList
private InstructionList 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.
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code
private Code 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 Detail
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Pass3aVerifier
public Pass3aVerifier(Verifier verifier, int methodNo)
Should only be instantiated by a Verifier.
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Method Detail
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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.
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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
- if the verification fails.- See Also:
do_verify()
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do_verify
public VerificationResult 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.
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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
- if the verification fails.
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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
- if the verification fails.
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tostring
protected java.lang.String tostring(java.lang.Object obj)
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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