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 ForDoubleVisitor implements Opcodes, LoopVisitor {
public Label beforeInit=new Label();
public Label beforeExpr=new Label(),afterExpr=new Label();
public Label beforeBody=new Label(),afterBody=new Label();
public Label beforeUpdate=new Label(),afterUpdate=new Label();
public int i;
public int visitBeforeExpression(GeneratorAdapter adapter, int start, int step, boolean isLocal) {
// init
adapter.visitLabel(beforeInit);
forInit(adapter, start, isLocal);
adapter.goTo(beforeExpr);
// update
adapter.visitLabel(beforeUpdate);
forUpdate(adapter, step, isLocal);
// expression
adapter.visitLabel(beforeExpr);
return i;
}
public void visitAfterExpressionBeginBody(GeneratorAdapter adapter) {
adapter.ifZCmp(Opcodes.IFEQ, afterBody);
}
public void visitEndBody(BytecodeContext bc,Position line) {
bc.getAdapter().goTo(beforeUpdate);
ExpressionUtil.visitLine(bc, line);
bc.getAdapter().visitLabel(afterBody);
//adapter.visitLocalVariable("i", "I", null, beforeInit, afterBody, i);
}
public void forInit(GeneratorAdapter adapter, int start, boolean isLocal) {
i=adapter.newLocal(Types.DOUBLE_VALUE);
if(isLocal)adapter.loadLocal(start,Types.DOUBLE_VALUE);
else adapter.push((double)start);
adapter.visitVarInsn(DSTORE, i);
}
public void forUpdate(GeneratorAdapter adapter, int step, boolean isLocal) {
if(isLocal) {
adapter.visitVarInsn(DLOAD, i);
adapter.loadLocal(step);
adapter.visitInsn(DADD);
adapter.visitVarInsn(DSTORE, i);
}
else adapter.visitIincInsn(i, step);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#visitContinue(org.objectweb.asm.commons.GeneratorAdapter)
*/
public void visitContinue(BytecodeContext bc) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, beforeUpdate);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#visitBreak(org.objectweb.asm.commons.GeneratorAdapter)
*/
public void visitBreak(BytecodeContext bc) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, afterBody);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#getContinueLabel()
*/
public Label getContinueLabel() {
return beforeUpdate;
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#getBreakLabel()
*/
public Label getBreakLabel() {
return afterBody;
}
}