public void visitExceptionInfo(
Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo) {
int startPC = Math.max(exceptionInfo.u2startPC, clipStart);
int endPC = Math.min(exceptionInfo.u2endPC, clipEnd);
int handlerPC = exceptionInfo.u2handlerPC;
int catchType = exceptionInfo.u2catchType;
// Exclude any subroutine invocations that jump out of the try block,
// by adding a try block before (and later on, after) each invocation.
for (int offset = startPC; offset < endPC; offset++) {
if (branchTargetFinder.isSubroutineInvocation(offset)) {
Instruction instruction = InstructionFactory.create(codeAttribute.code, offset);
int instructionLength = instruction.length(offset);
// Is it a subroutine invocation?
if (!exceptionInfo.isApplicable(offset + ((BranchInstruction) instruction).branchOffset)) {
if (DEBUG) {
System.out.println(
" Appending extra exception [" + startPC + " -> " + offset + "] -> " + handlerPC);
}
// Append a try block that ends before the subroutine invocation.
codeAttributeComposer.appendException(
new ExceptionInfo(startPC, offset, handlerPC, catchType));
// The next try block will start after the subroutine invocation.
startPC = offset + instructionLength;
}
}
}
if (DEBUG) {
System.out.println(
" Appending exception [" + startPC + " -> " + endPC + "] -> " + handlerPC);
}
// Append the exception. Note that exceptions with empty try blocks
// are automatically ignored.
codeAttributeComposer.appendException(new ExceptionInfo(startPC, endPC, handlerPC, catchType));
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) {
// Update the descriptor if it has any unused parameters.
String descriptor = programMethod.getDescriptor(programClass);
String newDescriptor = shrinkDescriptor(programMethod, descriptor);
if (!descriptor.equals(newDescriptor)) {
// Shrink the signature and parameter annotations.
programMethod.attributesAccept(programClass, this);
String name = programMethod.getName(programClass);
String newName = name;
// Append a code, if the method isn't a class instance initializer.
if (!name.equals(ClassConstants.INTERNAL_METHOD_NAME_INIT)) {
newName +=
ClassConstants.SPECIAL_MEMBER_SEPARATOR
+ Long.toHexString(Math.abs((descriptor).hashCode()));
}
if (DEBUG) {
System.out.println("MethodDescriptorShrinker:");
System.out.println(" Class file = " + programClass.getName());
System.out.println(" Method name = " + name);
System.out.println(" -> " + newName);
System.out.println(" Method descriptor = " + descriptor);
System.out.println(" -> " + newDescriptor);
}
ConstantPoolEditor constantPoolEditor = new ConstantPoolEditor(programClass);
// Update the name, if necessary.
if (!newName.equals(name)) {
programMethod.u2nameIndex = constantPoolEditor.addUtf8Constant(newName);
}
// Update the referenced classes.
programMethod.referencedClasses =
shrinkReferencedClasses(programMethod, descriptor, programMethod.referencedClasses);
// Finally, update the descriptor itself.
programMethod.u2descriptorIndex = constantPoolEditor.addUtf8Constant(newDescriptor);
// Visit the method, if required.
if (extraMemberVisitor != null) {
extraMemberVisitor.visitProgramMethod(programClass, programMethod);
}
}
}