Examples of org.mvel2.asm.Label

org.mvel2.asm.Label
A label represents a position in the bytecode of a method. Labels are used for jump, goto, and switch instructions, and for try catch blocks. A label designates the instruction that is just after. Note however that there can be other elements between a label and the instruction it designates (such as other labels, stack map frames, line numbers, etc.). @author Eric Bruneton

            if (isDeclarationExpression(right) && right.getType().isPrimitive()) {
                castFromPrimitive(right.getType());
            }
            store(RIGHT_OPERAND, rightType);


            Label shortcutEvaluation = new Label();
            BooleanOperator operation = singleCondition.getOperation();
            prepareLeftOperand(operation, type, leftType, rightType, shortcutEvaluation);
            prepareRightOperand(right, type, rightType, shortcutEvaluation);


            load(LEFT_OPERAND);

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                    castOrCoercePrimitive(LEFT_OPERAND, leftType, type);
                }
                return;
            }


            Label notNullLabel = jitLeftIsNull(type == null || leftType == type ?
                    jitNullSafeOperationStart() :
                    jitNullSafeCoercion(leftType, type));


            if (operation.isEquality() && !rightType.isPrimitive()) {
                // if (left == null) return right == null

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                    castOrCoercePrimitive(RIGHT_OPERAND, rightType, type);
                }
                return;
            }


            Label nullLabel = new Label();
            Label notNullLabel = new Label();
            load(RIGHT_OPERAND);
            mv.visitJumpInsn(IFNULL, nullLabel);
            if (type != null && !isFixed(right) && rightType != type) {
                castOrCoerceTo(RIGHT_OPERAND, rightType, type, nullLabel);
            }

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            mv.visitJumpInsn(GOTO, shortcutEvaluation);
            mv.visitLabel(notNullLabel);
        }


        private void checkNullEquality() {
            Label rightNullLabel = new Label();
            Label rightNotNullLabel = new Label();
            load(RIGHT_OPERAND);
            mv.visitJumpInsn(IFNULL, rightNullLabel);
            mv.visitInsn(ICONST_0);
            mv.visitJumpInsn(GOTO, rightNotNullLabel);
            mv.visitLabel(rightNullLabel);

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            mv.visitInsn(ICONST_1);
            mv.visitLabel(rightNotNullLabel);
        }


        private Label jitNullSafeOperationStart() {
            Label nullLabel = new Label();
            load(LEFT_OPERAND);
            mv.visitJumpInsn(IFNULL, nullLabel);
            return nullLabel;
        }

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            mv.visitJumpInsn(IFNULL, nullLabel);
            return nullLabel;
        }


        private Label jitNullSafeCoercion(Class<?> fromType, Class<?> toType) {
            Label nullLabel = new Label();
            load(LEFT_OPERAND);
            mv.visitJumpInsn(IFNULL, nullLabel);
            castOrCoerceTo(LEFT_OPERAND, fromType, toType, nullLabel);
            return nullLabel;
        }

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            castOrCoerceTo(LEFT_OPERAND, fromType, toType, nullLabel);
            return nullLabel;
        }


        private Label jitLeftIsNull(Label nullLabel) {
            Label notNullLabel = new Label();
            mv.visitJumpInsn(GOTO, notNullLabel);
            mv.visitLabel(nullLabel);
            return notNullLabel;
        }

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            mv.visitLabel(nullLabel);
            return notNullLabel;
        }


        private void castOrCoerceTo(int regNr, Class<?> fromType, Class<?> toType, Label nullLabel) {
            Label nonInstanceOfLabel = new Label();
            Label endOfCoercionLabel = new Label();
            load(regNr);
            instanceOf(toType);
            mv.visitJumpInsn(IFEQ, nonInstanceOfLabel);
            load(regNr);
            cast(toType);
            store(regNr, toType);
            mv.visitJumpInsn(GOTO, endOfCoercionLabel);


            mv.visitLabel(nonInstanceOfLabel);


            boolean isNumber = Number.class.isAssignableFrom(toType);


            Label tryOk = null;
            Label inCatch = null;
            if (isNumber) {
                Label beforeTry = new Label();
                tryOk = new Label();
                inCatch = new Label();
                mv.visitTryCatchBlock(beforeTry, tryOk, inCatch, "java/lang/NumberFormatException");
                mv.visitLabel(beforeTry);
            }


            mv.visitTypeInsn(NEW, internalName(toType));
            mv.visitInsn(DUP);
            load(regNr);
            coerceByConstructor(fromType, toType);
            store(regNr, toType);


            if (isNumber) {
                Label afterCatch = new Label();
                mv.visitLabel(tryOk);
                mv.visitJumpInsn(GOTO, afterCatch);
                mv.visitLabel(inCatch);
                mv.visitInsn(POP);
                mv.visitInsn(ACONST_NULL);

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        }


        private void jitPrimitiveOperation(BooleanOperator op, Class<?> type) {
            int opCode = toOpCode(op, type);


            Label trueBranchLabel = new Label();
            Label returnLabel = new Label();
            if (type == double.class) {
                mv.visitInsn(DCMPL);
            } else if (type == long.class) {
                mv.visitInsn(LCMP);
            } else if (type == float.class) {

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            mv.visitInsn(ICONST_1);
            mv.visitLabel(returnLabel);
        }


        private void jitNegation() {
            Label trueBranch = new Label();
            Label falseBranch = new Label();
            mv.visitJumpInsn(IFNE, trueBranch);
            mv.visitInsn(ICONST_1);
            mv.visitJumpInsn(GOTO, falseBranch);
            mv.visitLabel(trueBranch);
            mv.visitInsn(ICONST_0);

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