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.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private static Label[] newLabelArray(int size) {
    Label[] labels = new Label[size];
    for (int i = 0; i < size; i++) {
        labels[i] = new Label();
    }/*from   w  ww . j  ava  2s  . c o m*/
    return labels;
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitAccessGetter(List<? extends AssignableInfo> memberInfoList, AccessInfo accessInfo) {
    mv = cw.visitMethod(ACC_PUBLIC, accessInfo.getMethodName,
            "(" + classTypeDescriptor + "I)" + accessInfo.descriptor, null, null);
    mv.visitCode();//from  w w w . j  av a  2  s  .  c om
    Label firstLabel = new Label();
    mv.visitLabel(firstLabel);
    mv.visitVarInsn(ILOAD, 2);

    Label defaultCaseLabel = new Label();

    if (memberInfoList == null || memberInfoList.isEmpty()) {
        mv.visitInsn(POP);
        mv.visitLabel(defaultCaseLabel);
        visitAccessGetterLastPart(accessInfo.memberType, firstLabel);
        return;
    }

    boolean useTableSwitch = useTableSwitch(memberInfoList);
    Label[] labels = useTableSwitch ? getTableSwitchLabelsForAccess(defaultCaseLabel, memberInfoList)
            : newLabelArray(memberInfoList.size());

    if (useTableSwitch) {
        mv.visitTableSwitchInsn(memberInfoList.get(0).memberIndex,
                memberInfoList.get(memberInfoList.size() - 1).memberIndex, defaultCaseLabel, labels);
    } else {
        mv.visitLookupSwitchInsn(defaultCaseLabel,
                memberInfoList.stream().mapToInt(f -> f.memberIndex).toArray(), labels);
    }

    for (int i = 0; i < memberInfoList.size(); i++) {
        MemberInfo memberInfo = memberInfoList.get(i);

        mv.visitLabel(labels[i]);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 1);

        switch (accessInfo.memberType) {
        case MEMBER_TYPE_FIELD:
            mv.visitFieldInsn(((FieldInfo) memberInfo).getFieldOpcode, internalName, memberInfo.name,
                    accessInfo.descriptor);
            break;
        case MEMBER_TYPE_PROPERTY:
            mv.visitMethodInsn(INVOKEVIRTUAL, internalName, ((PropertyInfo) memberInfo).readMethodName,
                    "()" + accessInfo.descriptor, false);
            break;
        }

        mv.visitInsn(accessInfo.returnOpcode);
    }

    mv.visitLabel(defaultCaseLabel);
    mv.visitFrame(F_SAME, 0, null, 0, null);

    visitAccessGetterLastPart(accessInfo.memberType, firstLabel);
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitAccessGetterBridge(String methodName, String returnTypeDescriptor, int returnOpcode) {
    mv = cw.visitMethod(ACC_PUBLIC + ACC_BRIDGE + ACC_SYNTHETIC, methodName,
            "(Ljava/lang/Object;I)" + returnTypeDescriptor, null, null);
    mv.visitCode();//from w w  w  .ja  v a 2 s  . c o m
    mv.visitLabel(new Label());
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(CHECKCAST, internalName);
    mv.visitVarInsn(ILOAD, 2);
    mv.visitMethodInsn(INVOKEVIRTUAL, classAccessInternalName, methodName,
            "(" + classTypeDescriptor + "I)" + returnTypeDescriptor, false);
    mv.visitInsn(returnOpcode);
    mv.visitMaxs(3, 3);
    mv.visitEnd();
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitAccessGetterLastPart(String memberType, Label firstLabel) {
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);/*from w w w.  jav a2s  .c o m*/
    mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
    mv.visitInsn(DUP);
    mv.visitLdcInsn("No " + memberType + " with index: ");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false);
    mv.visitVarInsn(ILOAD, 2);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(I)Ljava/lang/StringBuilder;",
            false);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalArgumentException", "<init>", "(Ljava/lang/String;)V",
            false);
    mv.visitInsn(ATHROW);
    Label lastLabel = new Label();
    mv.visitLabel(lastLabel);
    mv.visitLocalVariable("this", classAccessTypeDescriptor, null, firstLabel, lastLabel, 0);
    mv.visitLocalVariable("obj", classTypeDescriptor, null, firstLabel, lastLabel, 1);
    mv.visitLocalVariable(memberType + "Index", "I", null, firstLabel, lastLabel, 2);
    mv.visitMaxs(5, 3);
    mv.visitEnd();
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitAccessSetter(List<? extends AssignableInfo> memberInfoList, AccessInfo accessInfo) {
    mv = cw.visitMethod(ACC_PUBLIC, accessInfo.setMethodName,
            "(" + classTypeDescriptor + "I" + accessInfo.descriptor + ")V", null, null);
    mv.visitCode();/*  ww w.  ja v a  2  s  . co m*/
    Label firstLabel = new Label();
    mv.visitLabel(firstLabel);
    mv.visitVarInsn(ILOAD, 2);

    Label defaultCaseLabel = new Label();

    if (memberInfoList == null || memberInfoList.isEmpty()) {
        mv.visitInsn(POP);
        mv.visitLabel(defaultCaseLabel);
        visitAccessSetterLastPart(accessInfo.memberType, accessInfo.descriptor, firstLabel, null);
        return;
    }

    boolean useTableSwitch = useTableSwitch(memberInfoList);
    Label[] labels = useTableSwitch ? getTableSwitchLabelsForAccess(defaultCaseLabel, memberInfoList)
            : newLabelArray(memberInfoList.size());

    if (useTableSwitch) {
        mv.visitTableSwitchInsn(memberInfoList.get(0).memberIndex,
                memberInfoList.get(memberInfoList.size() - 1).memberIndex, defaultCaseLabel, labels);
    } else {
        mv.visitLookupSwitchInsn(defaultCaseLabel,
                memberInfoList.stream().mapToInt(f -> f.memberIndex).toArray(), labels);
    }

    Label breakLabel = new Label();

    for (int i = 0; i < memberInfoList.size(); i++) {
        MemberInfo memberInfo = memberInfoList.get(i);

        mv.visitLabel(labels[i]);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitVarInsn(accessInfo.loadOpcode, 3);

        switch (accessInfo.memberType) {
        case MEMBER_TYPE_FIELD:
            mv.visitFieldInsn(((FieldInfo) memberInfo).setFieldOpcode, internalName, memberInfo.name,
                    accessInfo.descriptor);
            break;
        case MEMBER_TYPE_PROPERTY:
            mv.visitMethodInsn(INVOKEVIRTUAL, internalName, ((PropertyInfo) memberInfo).writeMethodName,
                    "(" + accessInfo.descriptor + ")V", false);
            break;
        }

        mv.visitLabel(new Label());
        mv.visitJumpInsn(GOTO, breakLabel);
    }

    mv.visitLabel(defaultCaseLabel);
    mv.visitFrame(F_SAME, 0, null, 0, null);

    visitAccessSetterLastPart(accessInfo.memberType, accessInfo.descriptor, firstLabel, breakLabel);
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitAccessSetterBridge(String methodName, int loadOpcode, String descriptor) {
    mv = cw.visitMethod(ACC_PUBLIC + ACC_BRIDGE + ACC_SYNTHETIC, methodName,
            "(Ljava/lang/Object;I" + descriptor + ")V", null, null);
    mv.visitCode();//w  w w .j av  a2s. c o m
    mv.visitLabel(new Label());
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(CHECKCAST, internalName);
    mv.visitVarInsn(ILOAD, 2);
    mv.visitVarInsn(loadOpcode, 3);
    mv.visitMethodInsn(INVOKEVIRTUAL, classAccessInternalName, methodName,
            "(" + classTypeDescriptor + "I" + descriptor + ")V", false);
    mv.visitInsn(RETURN);
    if (isDescriptorDoubleOrLong(descriptor)) {
        mv.visitMaxs(5, 5);
    } else {
        mv.visitMaxs(4, 4);
    }
    mv.visitEnd();
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitAccessSetterLastPart(String memberType, String fieldDescriptor, Label firstLabel,
        Label breakLabel) {/*from w  w  w .  j  a  v  a2s . com*/
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);
    mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
    mv.visitInsn(DUP);
    mv.visitLdcInsn("No " + memberType + " with index: ");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false);
    mv.visitVarInsn(ILOAD, 2);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(I)Ljava/lang/StringBuilder;",
            false);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalArgumentException", "<init>", "(Ljava/lang/String;)V",
            false);
    mv.visitInsn(ATHROW);

    if (breakLabel != null) {
        mv.visitLabel(breakLabel);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitInsn(RETURN);
    }

    Label lastLabel = new Label();
    mv.visitLabel(lastLabel);
    mv.visitLocalVariable("this", classAccessTypeDescriptor, null, firstLabel, lastLabel, 0);
    mv.visitLocalVariable("obj", classTypeDescriptor, null, firstLabel, lastLabel, 1);
    mv.visitLocalVariable(memberType + "Index", "I", null, firstLabel, lastLabel, 2);
    mv.visitLocalVariable("x", fieldDescriptor, null, firstLabel, lastLabel, 3);
    mv.visitMaxs(5, isDescriptorDoubleOrLong(fieldDescriptor) ? 5 : 4);
    mv.visitEnd();
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitGeneralAccessGetter(String methodName, String memberType,
        List<? extends AssignableInfo> memberInfoList) {
    mv = cw.visitMethod(ACC_PUBLIC, methodName, "(" + classTypeDescriptor + "I)Ljava/lang/Object;", null, null);
    mv.visitCode();/* w w w .ja v a  2s .c  om*/
    Label firstLabel = new Label();
    mv.visitLabel(firstLabel);
    mv.visitVarInsn(ILOAD, 2);

    Label defaultCaseLabel = new Label();

    if (memberInfoList == null || memberInfoList.isEmpty()) {
        mv.visitInsn(POP);
        mv.visitLabel(defaultCaseLabel);
        visitAccessGetterLastPart(memberType, firstLabel);
        return;
    }

    Label[] labels = getTableSwitchLabelsForAccess(defaultCaseLabel, memberInfoList);

    // Always use a table switch because there are no gaps between member indices
    mv.visitTableSwitchInsn(memberInfoList.get(0).memberIndex,
            memberInfoList.get(memberInfoList.size() - 1).memberIndex, defaultCaseLabel, labels);

    for (int i = 0; i < memberInfoList.size(); i++) {
        AssignableInfo member = memberInfoList.get(i);

        mv.visitLabel(labels[i]);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 1);

        switch (memberType) {
        case MEMBER_TYPE_FIELD:
            mv.visitFieldInsn(((FieldInfo) member).getFieldOpcode, internalName, member.name,
                    member.descriptor);
            break;
        case MEMBER_TYPE_PROPERTY:
            mv.visitMethodInsn(INVOKEVIRTUAL, internalName, ((PropertyInfo) member).readMethodName,
                    "()" + member.descriptor, false);
            break;
        }

        if (member.type.isPrimitive()) {
            Class<?> wrapperType = ClassUtils.primitiveToWrapper(member.type);
            mv.visitMethodInsn(INVOKESTATIC, Type.getInternalName(wrapperType), "valueOf",
                    "(" + member.descriptor + ")" + Type.getDescriptor(wrapperType), false);
        }

        mv.visitInsn(ARETURN);
    }

    mv.visitLabel(defaultCaseLabel);
    mv.visitFrame(F_SAME, 0, null, 0, null);

    visitAccessGetterLastPart(memberType, firstLabel);
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitGeneralAccessSetter(String methodName, String memberType,
        List<? extends AssignableInfo> memberInfoList) {
    mv = cw.visitMethod(ACC_PUBLIC, methodName, "(" + classTypeDescriptor + "ILjava/lang/Object;)V", null,
            null);/*  www  .j a v  a 2 s .co  m*/
    mv.visitCode();
    Label firstLabel = new Label();
    mv.visitLabel(firstLabel);
    mv.visitVarInsn(ILOAD, 2);

    Label defaultCaseLabel = new Label();

    if (memberInfoList == null || memberInfoList.isEmpty()) {
        mv.visitInsn(POP);
        mv.visitLabel(defaultCaseLabel);
        visitAccessSetterLastPart(memberType, "Ljava/lang/Object;", firstLabel, null);
        return;
    }

    Label[] labels = getTableSwitchLabelsForAccess(defaultCaseLabel, memberInfoList);

    // Always use a table switch because there are no gaps between member indices
    mv.visitTableSwitchInsn(memberInfoList.get(0).memberIndex,
            memberInfoList.get(memberInfoList.size() - 1).memberIndex, defaultCaseLabel, labels);

    Label breakLabel = new Label();

    for (int i = 0; i < memberInfoList.size(); i++) {
        AssignableInfo member = memberInfoList.get(i);

        mv.visitLabel(labels[i]);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitVarInsn(ALOAD, 3);

        checkCast(member);

        switch (memberType) {
        case MEMBER_TYPE_FIELD:
            mv.visitFieldInsn(((FieldInfo) member).setFieldOpcode, internalName, member.name,
                    member.descriptor);
            break;
        case MEMBER_TYPE_PROPERTY:
            mv.visitMethodInsn(INVOKEVIRTUAL, internalName, ((PropertyInfo) member).writeMethodName,
                    "(" + member.descriptor + ")V", false);
            break;
        }

        mv.visitLabel(new Label());
        mv.visitJumpInsn(GOTO, breakLabel);
    }

    mv.visitLabel(defaultCaseLabel);
    mv.visitFrame(F_SAME, 0, null, 0, null);

    visitAccessSetterLastPart(memberType, "Ljava/lang/Object;", firstLabel, breakLabel);
}

---

From source file:com.github.javalbert.reflection.ClassAccessFactory.java

License:Apache License

private void visitIndexMethod(String categoryOfStringCase,
        List<StringCaseReturnIndex> stringCaseReturnIndices) {
    mv = cw.visitMethod(ACC_PUBLIC, categoryOfStringCase + "Index", "(Ljava/lang/String;)I", null, null);
    mv.visitCode();//from  ww w. j  a v  a2s.co  m
    final Label firstLabel = new Label();
    mv.visitLabel(firstLabel);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitInsn(DUP);
    mv.visitVarInsn(ASTORE, 2);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);

    final Label defaultCaseLabel = new Label();

    if (stringCaseReturnIndices.isEmpty()) {
        mv.visitInsn(POP);
        mv.visitLabel(defaultCaseLabel);
        visitIndexMethodLastPart(categoryOfStringCase, firstLabel);
        return;
    }

    Collections.sort(stringCaseReturnIndices, StringCaseReturnIndex::compareHashCode);

    int[] stringHashCodes = new int[stringCaseReturnIndices.size()];
    Label[] caseLabels = new Label[stringCaseReturnIndices.size()];
    for (int i = 0; i < stringCaseReturnIndices.size(); i++) {
        stringHashCodes[i] = stringCaseReturnIndices.get(i).hashCode;
        caseLabels[i] = new Label();
    }

    mv.visitLookupSwitchInsn(defaultCaseLabel, stringHashCodes, caseLabels);

    for (int i = 0; i < stringCaseReturnIndices.size(); i++) {
        StringCaseReturnIndex stringCaseReturnIndex = stringCaseReturnIndices.get(i);

        mv.visitLabel(caseLabels[i]);

        if (i > 0) {
            mv.visitFrame(F_SAME, 0, null, 0, null);
        } else {
            mv.visitFrame(F_APPEND, 1, new Object[] { "java/lang/String" }, 0, null);
        }

        mv.visitVarInsn(ALOAD, 2);
        mv.visitLdcInsn(stringCaseReturnIndex.name);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
        mv.visitJumpInsn(IFNE, stringCaseReturnIndex.returnIndexLabel);
        mv.visitJumpInsn(GOTO, defaultCaseLabel);
    }

    Collections.sort(stringCaseReturnIndices, StringCaseReturnIndex::compareIndex);
    for (int i = 0; i < stringCaseReturnIndices.size(); i++) {
        StringCaseReturnIndex stringCaseReturnIndex = stringCaseReturnIndices.get(i);

        mv.visitLabel(stringCaseReturnIndex.returnIndexLabel);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        AsmUtils.visitZeroOperandInt(mv, stringCaseReturnIndex.index);
        mv.visitInsn(IRETURN);
    }

    mv.visitLabel(defaultCaseLabel);
    mv.visitFrame(F_SAME, 0, null, 0, null);

    visitIndexMethodLastPart(categoryOfStringCase, firstLabel);
}

---

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