Example usage for org.objectweb.asm Label Label

List of usage examples for org.objectweb.asm Label Label

  1. HOME
  2. Java
  3. org.objectweb.asm
  4. org.objectweb.asm.*
  5. Label
  6. 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.sun.fortress.compiler.codegen.CodeGenMethodVisitor.java

License:Open Source License

public void disposeCompilerLocal(int localId) {
    if (localId >= localVariableCount) {
        throw new CompilerError(
                "Trying to dispose of local " + localId + " but current metadata is off\nlocalVariableCount = "
                        + localVariableCount + "\nvarNames = " + varNames);
    }//  ww w.  ja v a 2s.co  m
    String ty = varTypes.get(localId);
    if (ty != null) {
        Label finish = new Label();
        visitLabel(finish);
        visitLocalVariable(varNames.get(localId), ty, null, varFirstUse.get(localId), finish, localId);
    }
    Debug.debug(Debug.Type.CODEGEN, 2, "LOCAL destroy ", localId, " ", varNames.get(localId));
    if (localId == (localVariableCount - 1)) {
        varNames.remove(localId);
        varTypes.remove(localId);
        varFirstUse.remove(localId);
        localVariableCount--;
    } else {
        varNames.set(localId, null);
        varTypes.set(localId, null);
        varFirstUse.set(localId, null);
    }
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

/**
 * Implementing "static reflection" for the method getFooRaw so the
 * interpreter uses a switch instruction for ***GetRaw
 * based on the hash values of String names in this namespace.
 *///from   w w w . j  av  a2  s.com
private static void writeMethodGetRaw(ClassWriter cw, String className, String methodName,
        EnvironmentClass environmentClass, EnvSymbolNames symbolNames) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, methodName,
            "(Ljava/lang/String;)" + environmentClass.descriptor(), null, null);
    mv.visitCode();

    Label beginFunction = new Label();
    mv.visitLabel(beginFunction);

    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I");
    mv.visitVarInsn(Opcodes.ISTORE, 2);
    Label beginLoop = new Label();
    mv.visitLabel(beginLoop);

    Relation<String, Integer> hashCodeRelation = symbolNames.makeHashCodeRelation(environmentClass);
    ArrayList<Integer> sortedCodes = new ArrayList<Integer>(hashCodeRelation.secondSet());
    Collections.sort(sortedCodes);
    Label returnNull = new Label();

    getRawHelper(mv, className, hashCodeRelation, environmentClass, sortedCodes, returnNull);

    mv.visitLabel(returnNull);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);

    Label endFunction = new Label();
    mv.visitLabel(endFunction);
    mv.visitLocalVariable("this", Naming.internalToDesc(className), null, beginFunction, endFunction, 0);
    mv.visitLocalVariable("queryString", "Ljava/lang/String;", null, beginFunction, endFunction, 1);
    mv.visitLocalVariable("queryHashCode", "I", null, beginLoop, endFunction, 2);
    // See comment above on ClassWriter.COMPUTE_FRAMES
    mv.visitMaxs(2, 3);
    mv.visitEnd();
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

private static void getRawHelper(MethodVisitor mv, String className, Relation<String, Integer> hashCodeRelation,
        EnvironmentClass environmentClass, List<Integer> sortedCodes, Label returnNull) {
    int[] codes = new int[sortedCodes.size()];
    Label[] labels = new Label[sortedCodes.size()];
    for (int i = 0; i < codes.length; i++) {
        codes[i] = sortedCodes.get(i);/*from  ww  w  .  j a  v a  2s. co  m*/
        Label label = new Label();
        labels[i] = label;
    }
    mv.visitVarInsn(Opcodes.ILOAD, 2);
    mv.visitLookupSwitchInsn(returnNull, codes, labels);
    for (int i = 0; i < codes.length; i++) {
        mv.visitLabel(labels[i]);
        getRawBaseCase(mv, className, hashCodeRelation, environmentClass, codes[i], returnNull);
    }
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

private static void getRawBaseCase(MethodVisitor mv, String className,
        Relation<String, Integer> hashCodeRelation, EnvironmentClass environmentClass, int code,
        Label returnNull) {/*  w  w  w .  j  av  a 2 s .  c o  m*/

    PredicateSet<String> strings = hashCodeRelation.matchSecond(code);
    for (String testString : strings) {
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitLdcInsn(testString);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z");
        Label afterReturn = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, afterReturn);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        String idString = testString + environmentClass.namespace();
        mv.visitFieldInsn(Opcodes.GETFIELD, className, Naming.mangleIdentifier(idString),
                environmentClass.descriptor());
        mv.visitInsn(Opcodes.ARETURN);
        mv.visitLabel(afterReturn);
    }
    mv.visitJumpInsn(Opcodes.GOTO, returnNull);
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

/**
 * Implementing "static reflection" for the method putRaw so the
 * interpreter uses a switch instruction for ***PutRaw
 * based on the hash values of String names in this namespace.
 *//*from  w  w  w.  j ava 2 s. c o  m*/
private static void writeMethodPutRaw(ClassWriter cw, String className, String methodName,
        EnvironmentClass environmentClass, EnvSymbolNames symbolNames) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, methodName,
            "(" + STRING_DESCRIPTOR + environmentClass.descriptor() + ")V", null, null);
    mv.visitCode();

    Label beginFunction = new Label();
    mv.visitLabel(beginFunction);
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, STRING_INTERNALNAME, "hashCode", "()I");
    mv.visitVarInsn(Opcodes.ISTORE, 3);
    Label beginLoop = new Label();
    mv.visitLabel(beginLoop);

    Relation<String, Integer> hashCodeRelation = symbolNames.makeHashCodeRelation(environmentClass);
    ArrayList<Integer> sortedCodes = new ArrayList<Integer>(hashCodeRelation.secondSet());
    Collections.sort(sortedCodes);
    Label notFound = new Label();
    putRawHelper(mv, className, environmentClass, hashCodeRelation, sortedCodes, notFound);
    mv.visitLabel(notFound);
    mv.visitInsn(Opcodes.RETURN);
    Label endFunction = new Label();
    mv.visitLabel(endFunction);
    mv.visitLocalVariable("this", Naming.internalToDesc(className), null, beginFunction, endFunction, 0);
    mv.visitLocalVariable("queryString", STRING_DESCRIPTOR, null, beginFunction, endFunction, 1);
    mv.visitLocalVariable("value", environmentClass.descriptor(), null, beginFunction, endFunction, 2);
    mv.visitLocalVariable("queryHashCode", "I", null, beginLoop, endFunction, 3);
    // See comment above on ClassWriter.COMPUTE_FRAMES
    mv.visitMaxs(2, 4);
    mv.visitEnd();
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

private static void putRawHelper(MethodVisitor mv, String className, EnvironmentClass environmentClass,
        Relation<String, Integer> hashCodeRelation, List<Integer> sortedCodes, Label notFound) {

    int[] codes = new int[sortedCodes.size()];
    Label[] labels = new Label[sortedCodes.size()];
    for (int i = 0; i < codes.length; i++) {
        codes[i] = sortedCodes.get(i);//w ww  . j a  v a  2  s.  com
        Label label = new Label();
        labels[i] = label;
    }
    mv.visitVarInsn(Opcodes.ILOAD, 3);
    mv.visitLookupSwitchInsn(notFound, codes, labels);
    for (int i = 0; i < codes.length; i++) {
        mv.visitLabel(labels[i]);
        putRawBaseCase(mv, className, hashCodeRelation, environmentClass, codes[i], notFound);
    }

}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

private static void putRawBaseCase(MethodVisitor mv, String className,
        Relation<String, Integer> hashCodeRelation, EnvironmentClass environmentClass, int code,
        Label notFound) {/*ww  w . ja v a  2s. c om*/

    PredicateSet<String> strings = hashCodeRelation.matchSecond(code);
    for (String testString : strings) {
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitLdcInsn(testString);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z");
        Label afterSetValue = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, afterSetValue);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitVarInsn(Opcodes.ALOAD, 2);
        String idString = testString + environmentClass.namespace();
        mv.visitFieldInsn(Opcodes.PUTFIELD, className, Naming.mangleIdentifier(idString),
                environmentClass.descriptor());
        mv.visitInsn(Opcodes.RETURN);
        mv.visitLabel(afterSetValue);
    }
    mv.visitJumpInsn(Opcodes.GOTO, notFound);
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

private static void writeNullGetter(ClassWriter cw, String className, String methodName, String signature) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, methodName, signature, null, null);
    mv.visitCode();/*from  w w w  . j av a 2s  . c  om*/
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable("this", Naming.internalToDesc(className), null, l0, l1, 0);
    mv.visitLocalVariable("str", "Ljava/lang/String;", null, l0, l1, 1);
    // See comment above on ClassWriter.COMPUTE_FRAMES
    mv.visitMaxs(1, 2);
    mv.visitEnd();
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

private static void writeNullSetter(ClassWriter cw, String className, String methodName, String signature) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, methodName, signature, null, null);
    mv.visitCode();//from   w ww .  ja v  a  2  s. c  o  m
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitInsn(Opcodes.RETURN);
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable("this", Naming.internalToDesc(className), null, l0, l1, 0);
    mv.visitLocalVariable("str", "Ljava/lang/String;", null, l0, l1, 1);
    mv.visitLocalVariable("f2", "Ljava/lang/Number;", null, l0, l1, 2);
    // See comment above on ClassWriter.COMPUTE_FRAMES
    mv.visitMaxs(0, 3);
    mv.visitEnd();
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

private static void writeRemoveMethod(ClassWriter cw, String className, String methodName, String invokeMethod,
        EnvironmentClass environmentClass) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, methodName, "(Ljava/lang/String;)V", null, null);
    mv.visitCode();//from w  w  w . ja  v  a  2s  .c o  m
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, className, invokeMethod,
            "(Ljava/lang/String;" + environmentClass.descriptor() + ")V");
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitInsn(Opcodes.RETURN);
    Label l2 = new Label();
    mv.visitLabel(l2);
    mv.visitLocalVariable("this", Naming.internalToDesc(className), null, l0, l2, 0);
    mv.visitLocalVariable("name", "Ljava/lang/String;", null, l0, l2, 1);
    // See comment above on ClassWriter.COMPUTE_FRAMES
    mv.visitMaxs(3, 2);
    mv.visitEnd();
}