public void visitVariableInstruction(
Clazz clazz,
Method method,
CodeAttribute codeAttribute,
int offset,
VariableInstruction variableInstruction) {
int variableSize = variableInstruction.variableIndex + 1;
if (variableInstruction.isCategory2()) {
variableSize++;
}
if (codeAttribute.u2maxLocals < variableSize) {
codeAttribute.u2maxLocals = variableSize;
if (DEBUG) {
System.out.println(
" Max locals: "
+ codeAttribute.u2maxLocals
+ " <- "
+ variableInstruction.toString(offset));
}
}
}
public void visitVariableInstruction(
Clazz clazz,
Method method,
CodeAttribute codeAttribute,
int offset,
VariableInstruction variableInstruction) {
byte opcode = variableInstruction.opcode;
if (opcode == InstructionConstants.OP_RET) {
// Is the return instruction the last instruction of the subroutine?
if (branchTargetFinder.subroutineEnd(offset) == offset + variableInstruction.length(offset)) {
if (DEBUG) {
System.out.println(" Replacing subroutine return at [" + offset + "] by a label");
}
// Append a label at this offset instead of the subroutine return.
codeAttributeComposer.appendLabel(offset);
} else {
if (DEBUG) {
System.out.println(
" Replacing subroutine return at [" + offset + "] by a simple branch");
}
// Replace the instruction by a branch.
Instruction replacementInstruction =
new BranchInstruction(
InstructionConstants.OP_GOTO, branchTargetFinder.subroutineEnd(offset) - offset)
.shrink();
codeAttributeComposer.appendInstruction(offset, replacementInstruction);
}
} else if (branchTargetFinder.isSubroutineStart(offset)) {
if (DEBUG) {
System.out.println(
" Replacing first subroutine instruction at [" + offset + "] by a label");
}
// Append a label at this offset instead of saving the subroutine
// return address.
codeAttributeComposer.appendLabel(offset);
} else {
// Append the instruction.
codeAttributeComposer.appendInstruction(offset, variableInstruction);
}
}
