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Java Source Code / Java Documentation » Byte Code » PROSE » ch.ethz.prose.jvmai.jikesrvm.advice_weaver

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Class Diagram

Java Document (Java Doc)

java.lang .Object

ch.ethz.prose.jvmai.jikesrvm.advice_weaver .MethodWeaver

MethodWeaver
public class MethodWeaver (Code)
	Modifies a given method to support advice execution. For each activated join point an advice is woven into the bytecode of the method and then installed in the VM using the services of VM_ClassEvolution. version: $Revision$ author: Johann Gyger author: Angela Nicoara

Field Summary
final public static String	JVMAI_CLASS String representation of the JVMAI class.
protected ConstantPoolGen	cpGen BCEL constant pool generator used during the weaving process.
protected Map	fieldAccessors Watched field accesses.
protected Map	fieldModifiers Watched field modifications.
protected InstructionFactory	instructionFactory BCEL instruction factory used during the weaving process.
protected InstructionList	instructions BCEL instructions that make up the method body (used during weaving process).
protected boolean	methodEntryEnabled
protected boolean	methodExitEnabled
protected MethodGen	methodGen BCEL method generator used during the weaving process.
protected boolean	modified
protected byte[]	originalCode Original bytecode of `target'.
protected Method	redefineAdvice Redefine advice method.
protected Method	target Method bound to this weaver.
protected Class	targetClass Declaring class of `target'.
protected int	targetId
final protected static boolean	verifyBytecodes
protected static Map	weavers Collection of all method weavers.
protected boolean	woven

Constructor Summary
protected	MethodWeaver(Method target) Create a new method weaver.

Method Summary
public void	addFieldAccessor(java.lang.reflect.Field f) Add a field for which a callback should be woven (for each access).
public void	addFieldModifier(java.lang.reflect.Field f) Add a field for which a callback should be woven (for each modification).
protected void	checkVerificationResult(VerificationResult vr, String pass) Check bytecode verification result.
public static synchronized void	commit() Re-weave all modified methods and activate them in the VM.
protected InstructionList	createFieldAdviceCallback(String callbackMethod, VM_Field field) Create a field advice callback that can be woven.
protected InstructionList	createMethodAdviceCallback(String callbackMethod) Create a method advice callback that can be woven.
public String	debugString()
protected void	finishWeaving() Clean up weaving process.
public static synchronized MethodWeaver	getWeaver(Method target) Get a unique method weaver for `target'.
protected void	initWeaving() Prepare for weaving by initializing the corresponding fields.
protected void	installBytecode() Install bytecode of woven method into the VM.
protected void	loadArg(InstructionList il, Type type, int index) Load argument at `index' of type `type'.
protected void	loadArgs(InstructionList il) Load all arguments.
public void	removeFieldAccessor(java.lang.reflect.Field f) Remove a field for which a callback was woven (for each access).
public void	removeFieldModifier(java.lang.reflect.Field f) Remove a field for which a callback was woven (for each modification).
public static synchronized void	resetAll() Reset all woven methods.
public void	setMethodEntryEnabled(boolean flag) Enable method entry join point.
public void	setMethodExitEnabled(boolean flag) Enable method entry join point.
public void	setRedefineAdvice(Method advice) Redefine the method in this weaver.
protected void	verify(ConstantPool cp, org.apache.bcel.classfile.Method bm) Verify bytecodes with the BCEL verifier.
protected void	weave() Weave advice that are associated with the method in this weaver.
protected void	weaveFieldAdvice() Weave all registered field accesses/modifications.
protected void	weaveMethodEntryAdvice() Weave method entry advice callback into method body.
protected void	weaveMethodExitAdvice() Weave method exit advice callback into method body.
protected void	weaveRedefineAdvice() Weave method redefine advice callback into method body and remove original code.

Field Detail

JVMAI_CLASS
final public static String JVMAI_CLASS(Code)
	String representation of the JVMAI class.

cpGen
protected ConstantPoolGen cpGen(Code)
	BCEL constant pool generator used during the weaving process.

fieldAccessors
protected Map fieldAccessors(Code)
	Watched field accesses.

fieldModifiers
protected Map fieldModifiers(Code)
	Watched field modifications.

instructionFactory
protected InstructionFactory instructionFactory(Code)
	BCEL instruction factory used during the weaving process.

instructions
protected InstructionList instructions(Code)
	BCEL instructions that make up the method body (used during weaving process).

methodEntryEnabled
protected boolean methodEntryEnabled(Code)
	Is method entry join point activated?

methodExitEnabled
protected boolean methodExitEnabled(Code)
	Is method exit join point activated?

methodGen
protected MethodGen methodGen(Code)
	BCEL method generator used during the weaving process.

modified
protected boolean modified(Code)
	Is a re-weaving of the method in this weaver necessary?

originalCode
protected byte[] originalCode(Code)
	Original bytecode of `target'.

redefineAdvice
protected Method redefineAdvice(Code)
	Redefine advice method.

target
protected Method target(Code)
	Method bound to this weaver.

targetClass
protected Class targetClass(Code)
	Declaring class of `target'.

targetId
protected int targetId(Code)
	Method identifier;

verifyBytecodes
final protected static boolean verifyBytecodes(Code)
	Should the bytecodes be verified before installing them into the VM?

weavers
protected static Map weavers(Code)
	Collection of all method weavers. For each method there exists exactly one method weaver in the system.

woven
protected boolean woven(Code)
	Was the method in this weaver woven at least once?

Constructor Detail

MethodWeaver
protected MethodWeaver(Method target)(Code)
	Create a new method weaver. Use the static method MethodWeaver.getWeaver(Method) to obtain a weaver. Parameters: target - method that will be woven

Method Detail

addFieldAccessor
public void addFieldAccessor(java.lang.reflect.Field f)(Code)
	Add a field for which a callback should be woven (for each access). Parameters: f - watched field

addFieldModifier
public void addFieldModifier(java.lang.reflect.Field f)(Code)
	Add a field for which a callback should be woven (for each modification). Parameters: f - watched field

checkVerificationResult
protected void checkVerificationResult(VerificationResult vr, String pass)(Code)
	Check bytecode verification result. Parameters: vr - verification result which must be checked Parameters: pass - verification pass

commit
public static synchronized void commit()(Code)
	Re-weave all modified methods and activate them in the VM.

createFieldAdviceCallback
protected InstructionList createFieldAdviceCallback(String callbackMethod, VM_Field field)(Code)
	Create a field advice callback that can be woven. Parameters: callbackMethod - method that will be called Parameters: fieldId - id of field instructions that make up the callback

createMethodAdviceCallback
protected InstructionList createMethodAdviceCallback(String callbackMethod)(Code)
	Create a method advice callback that can be woven. Parameters: callbackMethod - method that will be called instructions that make up the callback

debugString
public String debugString()(Code)

finishWeaving
protected void finishWeaving()(Code)
	Clean up weaving process.

getWeaver
public static synchronized MethodWeaver getWeaver(Method target)(Code)
	Get a unique method weaver for `target'. Parameters: target - method that will be woven

initWeaving
protected void initWeaving()(Code)
	Prepare for weaving by initializing the corresponding fields.

installBytecode
protected void installBytecode()(Code)
	Install bytecode of woven method into the VM.

loadArg
protected void loadArg(InstructionList il, Type type, int index)(Code)
	Load argument at `index' of type `type'. Basic types are wrapped. Parameters: il - list where instructions are appended Parameters: type - argument type Parameters: index - argument index

loadArgs
protected void loadArgs(InstructionList il)(Code)
	Load all arguments. Parameters: il - list where instructions are appended

removeFieldAccessor
public void removeFieldAccessor(java.lang.reflect.Field f)(Code)
	Remove a field for which a callback was woven (for each access). Parameters: f - watched field

removeFieldModifier
public void removeFieldModifier(java.lang.reflect.Field f)(Code)
	Remove a field for which a callback was woven (for each modification). Parameters: f - watched field

resetAll
public static synchronized void resetAll()(Code)
	Reset all woven methods.

setMethodEntryEnabled
public void setMethodEntryEnabled(boolean flag)(Code)
	Enable method entry join point. Parameters: flag - enable/disable

setMethodExitEnabled
public void setMethodExitEnabled(boolean flag)(Code)
	Enable method entry join point. Parameters: flag - enable/disable

setRedefineAdvice
public void setRedefineAdvice(Method advice)(Code)
	Redefine the method in this weaver. Parameters: advice - method that will be called instead

verify
protected void verify(ConstantPool cp, org.apache.bcel.classfile.Method bm)(Code)
	Verify bytecodes with the BCEL verifier. NOTE: Can't be used since even `normal' classes are rejected with Jikes RVM 2.3.0.1. Parameters: cp - constant pool that is used for verification Parameters: bm - method that is verified

weave
protected void weave()(Code)
	Weave advice that are associated with the method in this weaver.

weaveFieldAdvice
protected void weaveFieldAdvice()(Code)
	Weave all registered field accesses/modifications.

weaveMethodEntryAdvice
protected void weaveMethodEntryAdvice()(Code)
	Weave method entry advice callback into method body.

weaveMethodExitAdvice
protected void weaveMethodExitAdvice()(Code)
	Weave method exit advice callback into method body.

weaveRedefineAdvice
protected void weaveRedefineAdvice()(Code)
	Weave method redefine advice callback into method body and remove original code.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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