package railo.transformer.bytecode.visitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.GeneratorAdapter;
import railo.transformer.bytecode.BytecodeContext;
import railo.transformer.bytecode.Position;
import railo.transformer.bytecode.util.ExpressionUtil;
import railo.transformer.bytecode.util.Types;
public final class ForVisitor implements Opcodes,LoopVisitor {
private Label l0= new Label();
private Label l1= new Label();
private Label l2= new Label();
private Label l3= new Label();
private int i;
private Label lend= new Label();
private Label lbegin= new Label();
public int visitBegin(GeneratorAdapter adapter, int start, boolean isLocal) {
adapter.visitLabel(l0);
forInit(adapter, start, isLocal);
adapter.visitLabel(l1);
adapter.visitJumpInsn(GOTO, l2);
adapter.visitLabel(l3);
return i;
}
public void visitEnd(BytecodeContext bc, int end, boolean isLocal,Position startline) {
GeneratorAdapter adapter=bc.getAdapter();
adapter.visitLabel(lbegin);
forUpdate(adapter);
ExpressionUtil.visitLine(bc, startline);
adapter.visitLabel(l2);
adapter.visitVarInsn(ILOAD, i);
if(isLocal)adapter.loadLocal(end);
else adapter.push(end);
adapter.visitJumpInsn(IF_ICMPLE, l3);
adapter.visitLabel(lend);
//adapter.visitLocalVariable("i", "I", null, l1, lend, i);
}
private void forUpdate(GeneratorAdapter adapter) {
adapter.visitIincInsn(i, 1);
}
private void forInit(GeneratorAdapter adapter, int start, boolean isLocal) {
i=adapter.newLocal(Types.INT_VALUE);
if(isLocal)adapter.loadLocal(start);
else adapter.push(start);
adapter.visitVarInsn(ISTORE, i);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#visitContinue(org.objectweb.asm.commons.GeneratorAdapter)
*/
public void visitContinue(BytecodeContext bc) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, lbegin);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#visitBreak(org.objectweb.asm.commons.GeneratorAdapter)
*/
public void visitBreak(BytecodeContext bc) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, lend);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#getContinueLabel()
*/
public Label getContinueLabel() {
return lbegin;
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#getBreakLabel()
*/
public Label getBreakLabel() {
return lend;
}
}