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 void visitIndexMethodLastPart(String categoryOfStringCase, Label firstLabel) {
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);/*  ww  w.  j a va 2 s  . c  o  m*/
    mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
    mv.visitInsn(DUP);
    mv.visitLdcInsn("No " + categoryOfStringCase + " with name: ");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/String;)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("name", "Ljava/lang/String;", null, firstLabel, lastLabel, 1);
    mv.visitMaxs(5, 3);
    mv.visitEnd();
}

---

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

License:Apache License

private void visitMethodAccessBridge(int parameterCount) {
    mv = cw.visitMethod(ACC_PUBLIC + ACC_BRIDGE + ACC_SYNTHETIC, "call",
            getMethodAccessMethodDescriptor(parameterCount, "Ljava/lang/Object;"), null, null);
    mv.visitCode();//from  w w w .j  a 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);
    for (int i = 0; i < parameterCount; i++) {
        mv.visitVarInsn(ALOAD, 3 + i);
    }
    mv.visitMethodInsn(INVOKEVIRTUAL, classAccessInternalName, "call",
            getMethodAccessMethodDescriptor(parameterCount), false);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(3 + parameterCount, 3 + parameterCount);
    mv.visitEnd();
}

---

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

License:Apache License

private void visitMethodAccessInvokeBridge() {
    mv = cw.visitMethod(ACC_PUBLIC + ACC_BRIDGE + ACC_VARARGS + ACC_SYNTHETIC, "invoke",
            "(Ljava/lang/Object;I[Ljava/lang/Object;)Ljava/lang/Object;", null, null);
    mv.visitCode();// ww w. j  av a 2 s  .  c om
    mv.visitLabel(new Label());
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(CHECKCAST, internalName);
    mv.visitVarInsn(ILOAD, 2);
    mv.visitVarInsn(ALOAD, 3);
    mv.visitMethodInsn(INVOKEVIRTUAL, classAccessInternalName, "invoke",
            "(" + classTypeDescriptor + "I[Ljava/lang/Object;)Ljava/lang/Object;", false);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(4, 4);
    mv.visitEnd();
}

---

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

License:Apache License

private void visitMethodAccessInvokeMethod() {
    mv = cw.visitMethod(ACC_PUBLIC + ACC_VARARGS, "invoke",
            "(" + classTypeDescriptor + "I[Ljava/lang/Object;)Ljava/lang/Object;", null, null);
    mv.visitCode();//from   www  . j a  va2  s .c o m
    Label firstLabel = new Label();
    mv.visitLabel(firstLabel);
    mv.visitVarInsn(ILOAD, 2);

    Label defaultCaseLabel = new Label();

    if (methodInfoList == null || methodInfoList.isEmpty()) {
        mv.visitInsn(POP);
        mv.visitLabel(defaultCaseLabel);
        visitMethodAccessInvokeMethodLastPart(firstLabel);
        return;
    }

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

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

    for (int i = 0; i < methodInfoList.size(); i++) {
        MethodInfo methodInfo = methodInfoList.get(i);

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

        List<ParameterInfo> parameters = methodInfo.parameters;
        for (int j = 0; j < parameters.size(); j++) {
            ParameterInfo parameter = parameters.get(j);

            mv.visitVarInsn(ALOAD, 3);
            AsmUtils.visitZeroOperandInt(mv, j);
            mv.visitInsn(AALOAD);

            checkCast(parameter);
        }

        mv.visitMethodInsn(methodInfo.invokeOpcode, internalName, methodInfo.name, methodInfo.descriptor, true);
        if (methodInfo.method.getReturnType() == Void.TYPE) {
            mv.visitLabel(new Label());
            mv.visitInsn(ACONST_NULL);
        }
        mv.visitInsn(ARETURN);
    }

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

    visitMethodAccessInvokeMethodLastPart(firstLabel);
}

---

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

License:Apache License

private void visitMethodAccessInvokeMethodLastPart(Label firstLabel) {
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);/* w w  w  . j  a va 2  s. c  om*/
    mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
    mv.visitInsn(DUP);
    mv.visitLdcInsn("No method 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("methodIndex", "I", null, firstLabel, lastLabel, 2);
    mv.visitLocalVariable("args", "[Ljava/lang/Object;", null, firstLabel, lastLabel, 3);
    mv.visitMaxs(5, 4);
    mv.visitEnd();
}

---

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

License:Apache License

private void visitMethodAccessLastPart(Label firstLabel, int parameterCount) {
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);/*from  w  ww  .  ja v  a2s  .  c o m*/
    mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
    mv.visitInsn(DUP);
    mv.visitLdcInsn("No method with index ");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false);
    mv.visitLabel(new Label());
    mv.visitVarInsn(ILOAD, 2);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(I)Ljava/lang/StringBuilder;",
            false);
    mv.visitLdcInsn(" with " + parameterCount + " parameter(s)");
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
    mv.visitLabel(new Label());
    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("methodIndex", "I", null, firstLabel, lastLabel, 2);

    for (int i = 0; i < parameterCount; i++) {
        mv.visitLocalVariable("arg" + i, "Ljava/lang/Object;", null, firstLabel, lastLabel, 3 + i);
    }

    mv.visitMaxs(5, 3 + parameterCount);
    mv.visitEnd();
}

---

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

License:Apache License

private void visitMethodAccessMethod(int parameterCount) {
    List<MethodInfo> methodsWithParamCount = paramCountMethodsMap.get(parameterCount);

    mv = cw.visitMethod(ACC_PUBLIC, "call", getMethodAccessMethodDescriptor(parameterCount), null, null);
    mv.visitCode();/*from   www.java  2  s.  c  om*/
    Label firstLabel = new Label();
    mv.visitLabel(firstLabel);
    mv.visitVarInsn(ILOAD, 2);

    Label defaultCaseLabel = new Label();

    if (methodsWithParamCount == null || methodsWithParamCount.isEmpty()) {
        mv.visitInsn(POP);
        mv.visitLabel(defaultCaseLabel);
        visitMethodAccessLastPart(firstLabel, parameterCount);
        return;
    }

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

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

    for (int i = 0; i < methodsWithParamCount.size(); i++) {
        MethodInfo methodInfo = methodsWithParamCount.get(i);

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

        List<ParameterInfo> parameters = methodInfo.parameters;
        for (int j = 0; j < parameters.size(); j++) {
            ParameterInfo parameter = parameters.get(j);

            mv.visitVarInsn(ALOAD, 3 + j);

            checkCast(parameter);
        }

        mv.visitMethodInsn(methodInfo.invokeOpcode, internalName, methodInfo.name, methodInfo.descriptor, true);
        if (methodInfo.method.getReturnType() == Void.TYPE) {
            mv.visitLabel(new Label());
            mv.visitInsn(ACONST_NULL);
        }
        mv.visitInsn(ARETURN);
    }

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

    visitMethodAccessLastPart(firstLabel, parameterCount);
}

---

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

License:Apache License

private void visitMethodIndexMethod() {
    mv = cw.visitMethod(ACC_PUBLIC + ACC_VARARGS, "methodIndex", "(Ljava/lang/String;[Ljava/lang/Class;)I",
            "(Ljava/lang/String;[Ljava/lang/Class<*>;)I", null);
    mv.visitCode();//  w  w  w. ja  v  a2s  .  c o  m
    final Label firstLabel = new Label();
    mv.visitLabel(firstLabel);

    List<MethodNameReturnIndex> methodIndices = getMethodIndexSwitchCases();

    if (methodIndices.isEmpty()) {
        visitMethodIndexMethodLastPart(firstLabel, methodIndices);
        return;
    }

    mv.visitVarInsn(ALOAD, 1);
    mv.visitInsn(DUP);
    mv.visitVarInsn(ASTORE, 3);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);

    final Label defaultCaseLabel = new Label();

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

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

    mv.visitLookupSwitchInsn(defaultCaseLabel, methodNameHashCodes, caseLabels);

    for (int i = 0; i < methodIndices.size(); i++) {
        MethodNameReturnIndex methodIndex = methodIndices.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, 3);
        mv.visitLdcInsn(methodIndex.name);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
        mv.visitJumpInsn(IFNE, methodIndex.returnIndexLabel);
        mv.visitJumpInsn(GOTO, defaultCaseLabel);
    }

    Collections.sort(methodIndices, StringCaseReturnIndex::compareIndex);
    for (int i = 0; i < methodIndices.size(); i++) {
        visitMethodIndexReturnStatements(methodIndices.get(i), defaultCaseLabel);
    }

    mv.visitLabel(defaultCaseLabel);
    mv.visitFrame(F_CHOP, 1, null, 0, null);

    visitMethodIndexMethodLastPart(firstLabel, methodIndices);
}

---

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

License:Apache License

private void visitMethodIndexMethodLastPart(Label firstLabel, List<MethodNameReturnIndex> methodIndices) {
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);/*w ww .j  a  va 2  s  . c  o m*/
    mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
    mv.visitInsn(DUP);
    mv.visitLdcInsn("No method called ");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
    mv.visitLabel(new Label());
    mv.visitLdcInsn(" with parameters ");
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitMethodInsn(INVOKESTATIC, "java/util/Arrays", "stream",
            "([Ljava/lang/Object;)Ljava/util/stream/Stream;", false);
    mv.visitLabel(new Label());
    mv.visitInvokeDynamicInsn("apply", "()Ljava/util/function/Function;", new Handle(H_INVOKESTATIC,
            "java/lang/invoke/LambdaMetafactory", "metafactory",
            "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;",
            false),
            new Object[] { Type.getType("(Ljava/lang/Object;)Ljava/lang/Object;"),
                    new Handle(H_INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;", false),
                    Type.getType("(Ljava/lang/Class;)Ljava/lang/String;") });
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/stream/Stream", "map",
            "(Ljava/util/function/Function;)Ljava/util/stream/Stream;", true);
    mv.visitLabel(new Label());
    mv.visitMethodInsn(INVOKESTATIC, "java/util/stream/Collectors", "toList", "()Ljava/util/stream/Collector;",
            false);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/stream/Stream", "collect",
            "(Ljava/util/stream/Collector;)Ljava/lang/Object;", true);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/Object;)Ljava/lang/StringBuilder;", false);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
    mv.visitLabel(new Label());
    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("name", "Ljava/lang/String;", null, firstLabel, lastLabel, 1);
    mv.visitLocalVariable("parameterTypes", "[Ljava/lang/Class;", null, firstLabel, lastLabel, 2);
    mv.visitMaxs(5, methodIndices.isEmpty() ? 3 : 4);
    mv.visitEnd();
}

---

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

License:Apache License

private void visitMethodIndexReturnStatements(MethodNameReturnIndex methodIndex, Label defaultCaseLabel) {
    Label jumpLabel = methodIndex.returnIndexLabel;

    List<MethodInfo> methods = methodIndex.methods;
    for (int i = 0; i < methods.size(); i++) {
        MethodInfo methodInfo = methods.get(i);
        Class<?>[] parameterTypes = methodInfo.method.getParameterTypes();

        mv.visitLabel(jumpLabel);/*w  w w. j a  va 2 s .c  o  m*/
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 2);
        AsmUtils.visitZeroOperandInt(mv, parameterTypes.length);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Class");

        for (int j = 0; j < parameterTypes.length; j++) {
            mv.visitInsn(DUP);
            AsmUtils.visitZeroOperandInt(mv, j);

            Class<?> parameterType = parameterTypes[j];
            if (parameterType.isPrimitive()) {
                mv.visitFieldInsn(GETSTATIC, Type.getInternalName(ClassUtils.primitiveToWrapper(parameterType)),
                        "TYPE", "Ljava/lang/Class;");
            } else {
                mv.visitLdcInsn(Type.getType(parameterType));
            }

            mv.visitInsn(AASTORE);
        }

        mv.visitMethodInsn(INVOKESTATIC, "java/util/Arrays", "equals",
                "([Ljava/lang/Object;[Ljava/lang/Object;)Z", false);

        jumpLabel = i + 1 >= methods.size() ? defaultCaseLabel : new Label();
        mv.visitJumpInsn(IFEQ, jumpLabel);

        mv.visitLabel(new Label());
        AsmUtils.visitZeroOperandInt(mv, methodInfo.memberIndex);
        mv.visitInsn(IRETURN);
    }
}

---

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