Example usage for org.objectweb.asm Label Label

Introduction

In this page you can find the example usage for org.objectweb.asm Label Label.

Prototype

public Label()

Source Link

Document

Constructs a new label.

Usage

From source file:com.yahoo.yqlplus.engine.internal.generate.StructGenerator.java

private void generatePutMethod() {
    final MethodGenerator setGenerator = createMethod("set");
    final BytecodeExpression propertyNameExpr = setGenerator.addArgument("propertyName", BaseTypeAdapter.STRING)
            .read();/* www  . ja  va2 s.c  o  m*/
    final BytecodeExpression valueExpr = setGenerator.addArgument("value", AnyTypeWidget.getInstance()).read();
    setGenerator.add(new BytecodeSequence() {
        @Override
        public void generate(CodeEmitter code) {
            Map<String, Label> labelMap = Maps.newLinkedHashMap();
            Label done = new Label();
            for (Map.Entry<String, FieldProperty> field : fields.entrySet()) {
                labelMap.put(field.getKey(), new Label());
            }
            propertyNameExpr.generate(code);
            code.emitStringSwitch(labelMap, done, true);
            MethodVisitor mv = code.getMethodVisitor();
            for (Map.Entry<String, FieldProperty> field : fields.entrySet()) {
                mv.visitLabel(labelMap.get(field.getKey()));
                BytecodeExpression castValue = new BytecodeCastExpression(field.getValue().property.type,
                        valueExpr);
                field.getValue().property(setGenerator.getLocal("this").read()).write(castValue).generate(code);
                mv.visitJumpInsn(Opcodes.GOTO, done);
            }
            mv.visitLabel(done);
            mv.visitInsn(Opcodes.RETURN);
        }
    });
}

From source file:com.yahoo.yqlplus.engine.internal.generate.StructGenerator.java

private void generateGetMethod() {
    final MethodGenerator getGenerator = createMethod("get");
    getGenerator.setReturnType(AnyTypeWidget.getInstance());
    final BytecodeExpression propertyNameExpr = getGenerator.addArgument("propertyName", BaseTypeAdapter.STRING)
            .read();/*w  ww .j  a va 2 s . c o  m*/
    getGenerator.add(new BytecodeSequence() {
        @Override
        public void generate(CodeEmitter code) {
            Map<String, Label> labelMap = Maps.newLinkedHashMap();
            Label defaultCase = new Label();
            Label done = new Label();
            for (Map.Entry<String, FieldProperty> field : fields.entrySet()) {
                labelMap.put(field.getKey(), new Label());
            }
            propertyNameExpr.generate(code);
            code.emitStringSwitch(labelMap, defaultCase, true);
            MethodVisitor mv = code.getMethodVisitor();
            for (Map.Entry<String, FieldProperty> field : fields.entrySet()) {
                mv.visitLabel(labelMap.get(field.getKey()));
                field.getValue().property(getGenerator.getLocal("this").read()).read().generate(code);
                code.box(field.getValue().property.type);
                mv.visitJumpInsn(Opcodes.GOTO, done);
            }
            mv.visitLabel(defaultCase);
            new NullExpr(AnyTypeWidget.getInstance()).generate(code);
            mv.visitLabel(done);
            mv.visitInsn(Opcodes.ARETURN);
        }
    });
}

From source file:com.yahoo.yqlplus.engine.internal.plan.types.base.AnyTypeWidget.java

@Override
public ComparisonAdapter getComparisionAdapter() {
    Preconditions.checkState(!isPrimitive(), "BaseTypeWidget should not be handling a primitive type");
    return new ComparisonAdapter() {
        @Override//from  w w  w.j  a  va2 s  .c  o m
        public void coerceBoolean(CodeEmitter scope, Label isTrue, Label isFalse, Label isNull) {
            // null or true
            scope.nullTest(AnyTypeWidget.getInstance(), isNull);
            Label popTrue = new Label();
            scope.emitInstanceOf(AnyTypeWidget.getInstance(), Boolean.class, popTrue);
            final MethodVisitor mv = scope.getMethodVisitor();
            mv.visitMethodInsn(Opcodes.GETSTATIC, Type.getInternalName(Boolean.class), "TRUE",
                    Type.getMethodDescriptor(Type.getType(Boolean.class)), false);
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(Boolean.class), "equals",
                    Type.getMethodDescriptor(Type.BOOLEAN_TYPE, Type.getType(Object.class)), false);
            mv.visitJumpInsn(Opcodes.IFEQ, isFalse);
            mv.visitJumpInsn(Opcodes.GOTO, isTrue);
            mv.visitLabel(popTrue);
            scope.pop(AnyTypeWidget.getInstance());
            mv.visitJumpInsn(Opcodes.GOTO, isTrue);
        }
    };
}

From source file:com.yahoo.yqlplus.engine.internal.plan.types.base.ArrayIndexAdapter.java

@Override
public BytecodeExpression length(final BytecodeExpression inputExpr) {
    return new BaseTypeExpression(BaseTypeAdapter.INT32) {
        @Override/*w w w . j a  v a2  s  .c om*/
        public void generate(CodeEmitter code) {
            Label done = new Label();
            Label isNull = new Label();
            MethodVisitor mv = code.getMethodVisitor();
            code.exec(inputExpr);
            boolean nullable = code.nullTest(inputExpr.getType(), isNull);
            mv.visitInsn(Opcodes.ARRAYLENGTH);
            if (nullable) {
                mv.visitJumpInsn(Opcodes.GOTO, done);
                mv.visitLabel(isNull);
                mv.visitInsn(Opcodes.ICONST_0);
                mv.visitLabel(done);
            }
        }
    };
}

From source file:com.yahoo.yqlplus.engine.internal.plan.types.base.ArrayIndexAdapter.java

@Override
public BytecodeSequence iterate(final BytecodeExpression target, final AssignableValue item,
        final IterateLoop loop) {
    return new BytecodeSequence() {
        @Override//from ww w.j  a  v  a  2  s .c  o  m
        public void generate(CodeEmitter start) {
            CodeEmitter code = start.createScope();
            final AssignableValue count = code.allocate(BaseTypeAdapter.INT32);
            final AssignableValue idx = code.allocate(BaseTypeAdapter.INT32);
            Label done = new Label();
            Label next = new Label();
            MethodVisitor mv = code.getMethodVisitor();
            BytecodeExpression tgt = code.evaluateOnce(target);
            code.exec(tgt);
            code.nullTest(tgt.getType(), done);
            mv.visitInsn(Opcodes.ARRAYLENGTH);
            code.exec(count.write(BaseTypeAdapter.INT32));
            code.emitIntConstant(0);
            code.exec(idx.write(BaseTypeAdapter.INT32));
            mv.visitLabel(next);
            code.exec(count.read());
            mv.visitJumpInsn(Opcodes.IFEQ, done);
            code.inc(count, -1);
            code.exec(tgt);
            code.exec(idx.read());
            code.getMethodVisitor().visitInsn(ownerType.getJVMType().getOpcode(Opcodes.IALOAD));
            code.inc(idx, 1);
            code.nullTest(valueType, next);
            code.exec(item.write(item.getType()));
            loop.item(code, item.read(), done, next);
            mv.visitJumpInsn(Opcodes.GOTO, next);
            mv.visitLabel(done);
            code.endScope();
        }
    };
}

From source file:com.yahoo.yqlplus.engine.internal.plan.types.base.ArrayIndexAdapter.java

@Override
public BytecodeExpression first(final BytecodeExpression target) {
    // what should this return if the array is of length 0?
    return new BaseTypeExpression(NullableTypeWidget.create(valueType.boxed())) {
        @Override//from   ww  w .  ja va 2 s  .  c o m
        public void generate(CodeEmitter start) {
            CodeEmitter code = start.createScope();
            Label done = new Label();
            Label isNull = new Label();
            MethodVisitor mv = code.getMethodVisitor();
            BytecodeExpression tgt = code.evaluateOnce(target);
            code.exec(tgt);
            code.nullTest(tgt.getType(), isNull);
            mv.visitInsn(Opcodes.ARRAYLENGTH);
            mv.visitJumpInsn(Opcodes.IFEQ, isNull);
            code.exec(tgt);
            code.emitIntConstant(0);
            mv.visitInsn(ownerType.getJVMType().getOpcode(Opcodes.IALOAD));
            code.cast(valueType.boxed(), valueType, isNull);
            mv.visitJumpInsn(Opcodes.GOTO, done);
            mv.visitLabel(isNull);
            mv.visitInsn(Opcodes.ACONST_NULL);
            mv.visitLabel(done);
            code.endScope();
        }
    };
}

From source file:com.yahoo.yqlplus.engine.internal.plan.types.base.BasePropertyAdapter.java

@Override
public final BytecodeExpression construct(final Map<String, BytecodeExpression> fields) {
    return new BaseTypeExpression(type) {
        @Override//from   w  w  w . j a  v a 2s  .  co m
        public void generate(CodeEmitter top) {
            CodeEmitter code = top.createScope();
            BytecodeExpression input = code.evaluateOnce(type.construct());
            for (Map.Entry<String, BytecodeExpression> e : fields.entrySet()) {
                AssignableValue out = property(input, e.getKey());
                BytecodeExpression value = e.getValue();
                if (value.getType().isNullable()) {
                    Label nextItem = new Label();
                    value = code.evaluateOnce(value);
                    code.gotoIfNull(value, nextItem);
                    code.exec(out.write(
                            new BytecodeCastExpression(NotNullableTypeWidget.create(out.getType()), value)));
                    code.getMethodVisitor().visitLabel(nextItem);
                } else {
                    code.exec(out.write(e.getValue()));
                }
            }
            code.exec(input);
            code.endScope();
        }
    };
}

From source file:com.yahoo.yqlplus.engine.internal.plan.types.base.ClosedPropertyAdapter.java

@Override
public final BytecodeSequence visitProperties(final BytecodeExpression target, final PropertyVisit loop) {
    return new BytecodeSequence() {
        @Override/*from   ww  w.  j a  v a 2  s . co  m*/
        public void generate(CodeEmitter code) {
            Label done = new Label();
            MethodVisitor mv = code.getMethodVisitor();
            for (Property property : getProperties()) {
                Label nextProperty = new Label();
                BytecodeExpression propertyValue = code.evaluateOnce(property(target, property.name));
                boolean maybeNull = code.gotoIfNull(propertyValue, nextProperty);
                if (maybeNull) {

                    propertyValue = new NullCheckedEvaluatedExpression(propertyValue);
                }
                loop.item(code, new StringConstantExpression(property.name), propertyValue, done, nextProperty);
                if (maybeNull) {
                    mv.visitLabel(nextProperty);
                }
            }
            mv.visitLabel(done);

        }
    };
}

From source file:com.yahoo.yqlplus.engine.internal.plan.types.base.CollectionSizeExpression.java

@Override
public void generate(CodeEmitter code) {
    Label done = new Label();
    Label isNull = new Label();
    MethodVisitor mv = code.getMethodVisitor();
    code.exec(target);//from w w w.  jav  a  2  s  .  c om
    boolean nullable = code.nullTest(target.getType(), isNull);
    code.getMethodVisitor().visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(Collection.class),
            "size", Type.getMethodDescriptor(Type.INT_TYPE), true);
    if (nullable) {
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(isNull);
        mv.visitInsn(Opcodes.ICONST_0);
        mv.visitLabel(done);
    }
}

From source file:com.yahoo.yqlplus.engine.internal.plan.types.base.IntegerSwitchSequence.java

@Override
public void generate(CodeEmitter code) {
    Map<Integer, Label> labelMap = Maps.newHashMapWithExpectedSize(sequenceMap.size());
    for (Integer key : sequenceMap.keySet()) {
        labelMap.put(key, new Label());
    }//from   ww  w  . j  a va  2 s . c  o m
    Label done = new Label();
    Label defaultCase = defaultSequence == BytecodeSequence.NOOP ? done : new Label();
    code.emitIntegerSwitch(labelMap, defaultCase);
    MethodVisitor mv = code.getMethodVisitor();
    for (Map.Entry<Integer, BytecodeSequence> e : sequenceMap.entrySet()) {
        mv.visitLabel(labelMap.get(e.getKey()));
        code.exec(e.getValue());
        mv.visitJumpInsn(Opcodes.GOTO, done);
    }
    if (defaultCase != done) {
        mv.visitLabel(defaultCase);
        code.exec(defaultSequence);
    }
    mv.visitLabel(done);

}