Example usage for org.objectweb.asm MethodVisitor visitLabel

Introduction

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

Prototype

public void visitLabel(final Label label) 

Source Link

Document

Visits a label.

Usage

From source file:org.eclipse.golo.compiler.JavaBytecodeStructGenerator.java

License:Open Source License

private void makeSetMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "set",
            "(Ljava/lang/String;Ljava/lang/Object;)L" + owner + ";", null, null);
    visitor.visitCode();/*from w w  w  .  jav  a2s.  c  o  m*/
    insertPrivateElementCheck(struct, visitor);
    Label nextCase = new Label();
    for (Member member : struct.getMembers()) {
        visitor.visitLdcInsn(member.getName());
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
        visitor.visitJumpInsn(IFEQ, nextCase);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitVarInsn(ALOAD, 2);
        visitor.visitMethodInsn(INVOKEVIRTUAL, owner, member.getName(), "(Ljava/lang/Object;)L" + owner + ";",
                false);
        visitor.visitInsn(ARETURN);
        visitor.visitLabel(nextCase);
        nextCase = new Label();
    }
    insertUnknowElementCode(struct, visitor);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

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From source file:org.eclipse.golo.compiler.JavaBytecodeStructGenerator.java

License:Open Source License

private void makeGetMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "get", "(Ljava/lang/String;)Ljava/lang/Object;",
            null, null);/*from w  w  w. ja v  a  2s  . c o  m*/
    visitor.visitCode();
    insertPrivateElementCheck(struct, visitor);
    Label nextCase = new Label();
    for (Member member : struct.getMembers()) {
        visitor.visitLdcInsn(member.getName());
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
        visitor.visitJumpInsn(IFEQ, nextCase);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitMethodInsn(INVOKEVIRTUAL, owner, member.getName(), "()Ljava/lang/Object;", false);
        visitor.visitInsn(ARETURN);
        visitor.visitLabel(nextCase);
        nextCase = new Label();
    }
    insertUnknowElementCode(struct, visitor);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

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From source file:org.eclipse.golo.compiler.JavaBytecodeStructGenerator.java

License:Open Source License

private void insertPrivateElementCheck(Struct struct, MethodVisitor visitor) {
    Label afterPrivateCheck = new Label();
    visitor.visitVarInsn(ALOAD, 1);/* w w w  .j a  v  a 2s  .c  o m*/
    visitor.visitLdcInsn("_");
    visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "startsWith", "(Ljava/lang/String;)Z", false);
    visitor.visitJumpInsn(IFEQ, afterPrivateCheck);
    throwLocalized(visitor, "java/lang/IllegalArgumentException", "struct_private_member",
            struct.getPackageAndClass().toString());
    visitor.visitLabel(afterPrivateCheck);
}

---

From source file:org.eclipse.golo.compiler.JavaBytecodeStructGenerator.java

License:Open Source License

private void makeEquals(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "equals", "(Ljava/lang/Object;)Z", null, null);
    Label notFrozenLabel = new Label();
    Label falseLabel = new Label();
    Label sameTypeLabel = new Label();
    visitor.visitCode();/*w w  w  .  jav  a2 s. c om*/
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFNE, notFrozenLabel);
    // super.equals()
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z", false);
    visitor.visitInsn(IRETURN);
    // The receiver is frozen
    visitor.visitLabel(notFrozenLabel);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitTypeInsn(INSTANCEOF, owner);
    visitor.visitJumpInsn(IFNE, sameTypeLabel);
    visitor.visitJumpInsn(GOTO, falseLabel);
    // The argument is of the same type, too
    visitor.visitLabel(sameTypeLabel);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitTypeInsn(CHECKCAST, owner);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFEQ, falseLabel);
    // The argument is not frozen
    for (Member member : struct.getMembers()) {
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member.getName(), "Ljava/lang/Object;");
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitTypeInsn(CHECKCAST, owner);
        visitor.visitFieldInsn(GETFIELD, owner, member.getName(), "Ljava/lang/Object;");
        visitor.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "equals",
                "(Ljava/lang/Object;Ljava/lang/Object;)Z", false);
        visitor.visitJumpInsn(IFEQ, falseLabel);
    }
    visitor.visitInsn(ICONST_1);
    visitor.visitInsn(IRETURN);
    // False
    visitor.visitLabel(falseLabel);
    visitor.visitInsn(ICONST_0);
    visitor.visitInsn(IRETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

---

From source file:org.eclipse.golo.compiler.JavaBytecodeStructGenerator.java

License:Open Source License

private void makeHashCode(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "hashCode", "()I", null, null);
    Label notFrozenLabel = new Label();
    visitor.visitCode();//from   w w  w  .  java 2 s .c  o m
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFNE, notFrozenLabel);
    // super.hashCode()
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "hashCode", "()I", false);
    visitor.visitInsn(IRETURN);
    // The receiver is frozen
    visitor.visitLabel(notFrozenLabel);
    loadInteger(visitor, struct.getMembers().size());
    visitor.visitTypeInsn(ANEWARRAY, "java/lang/Object");
    int i = 0;
    for (Member member : struct.getMembers()) {
        visitor.visitInsn(DUP);
        loadInteger(visitor, i);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member.getName(), "Ljava/lang/Object;");
        visitor.visitInsn(AASTORE);
        i++;
    }
    visitor.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "hash", "([Ljava/lang/Object;)I", false);
    visitor.visitInsn(IRETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

---

From source file:org.eclipse.golo.compiler.JavaBytecodeStructGenerator.java

License:Open Source License

private void makeSetter(ClassWriter classWriter, String owner, String name, Struct struct) {
    int accessFlag = name.startsWith("_") ? ACC_PRIVATE : ACC_PUBLIC;
    MethodVisitor visitor = classWriter.visitMethod(accessFlag, name,
            "(Ljava/lang/Object;)L" + struct.getPackageAndClass().toJVMType() + ";", null, null);
    visitor.visitCode();/*from   w ww  .j a va  2s  . co m*/
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    Label setLabel = new Label();
    visitor.visitJumpInsn(IFEQ, setLabel);
    throwLocalized(visitor, "java/lang/IllegalStateException", "frozen_struct",
            struct.getPackageAndClass().toString());
    visitor.visitLabel(setLabel);
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitFieldInsn(PUTFIELD, owner, name, "Ljava/lang/Object;");
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitInsn(ARETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

---

From source file:org.eclipse.golo.compiler.JavaBytecodeUnionGenerator.java

License:Open Source License

private void makeMatchlikeTestMethod(ClassWriter classWriter, UnionValue value, boolean result) {
    String methName = "is" + value.getName();
    MethodVisitor mv = classWriter.visitMethod(ACC_PUBLIC, methName, "()Z", null, null);
    mv.visitCode();/*  w  w  w. j  a  va 2s  .c om*/
    mv.visitInsn(result ? ICONST_1 : ICONST_0);
    mv.visitInsn(IRETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();

    if (value.hasMembers()) {
        mv = classWriter.visitMethod(ACC_PUBLIC, methName, argsSignature(value.getMembers().size()) + "Z", null,
                null);
        for (Member member : value.getMembers()) {
            mv.visitParameter(member.getName(), ACC_FINAL);
        }
        mv.visitCode();
        if (!result) {
            mv.visitInsn(ICONST_0);
        } else {
            int i = 1;
            Label allEquals = new Label();
            Label notEqual = new Label();
            String target = value.getPackageAndClass().toJVMType();
            for (Member member : value.getMembers()) {
                mv.visitVarInsn(ALOAD, i);
                mv.visitVarInsn(ALOAD, 0);
                mv.visitFieldInsn(GETFIELD, target, member.getName(), "Ljava/lang/Object;");
                mv.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "equals",
                        "(Ljava/lang/Object;Ljava/lang/Object;)Z", false);
                mv.visitJumpInsn(IFEQ, notEqual);
                i++;
            }
            mv.visitInsn(ICONST_1);
            mv.visitJumpInsn(GOTO, allEquals);
            mv.visitLabel(notEqual);
            mv.visitInsn(ICONST_0);
            mv.visitLabel(allEquals);
        }
        mv.visitInsn(IRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
}

---

From source file:org.eclipse.golo.compiler.JavaBytecodeUnionGenerator.java

License:Open Source License

private void makeEquals(ClassWriter cw, UnionValue value) {
    String target = value.getPackageAndClass().toJVMType();
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "equals", "(Ljava/lang/Object;)Z", null, null);
    Label notSameInstance = new Label();
    Label notNull = new Label();
    Label sameType = new Label();
    Label allAttrsEquals = new Label();
    Label attrNotEqual = new Label();
    mv.visitCode();/*from  www. ja v a 2s .c o  m*/

    // if (other == this) { return true; }
    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitJumpInsn(IF_ACMPNE, notSameInstance);
    mv.visitInsn(ICONST_1);
    mv.visitInsn(IRETURN);
    mv.visitLabel(notSameInstance);

    // if (other == null) { return false; }
    mv.visitVarInsn(ALOAD, 1);
    mv.visitJumpInsn(IFNONNULL, notNull);
    mv.visitInsn(ICONST_0);
    mv.visitInsn(IRETURN);
    mv.visitLabel(notNull);

    // if (!(other instanceof <value>)) { return false; }
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(INSTANCEOF, target);
    mv.visitJumpInsn(IFNE, sameType);
    mv.visitInsn(ICONST_0);
    mv.visitInsn(IRETURN);
    mv.visitLabel(sameType);

    // cast other to <value>
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(CHECKCAST, target);
    mv.visitVarInsn(ASTORE, 2);

    // java.util.Objects.equals(<member>, other.<member>)
    for (Member member : value.getMembers()) {
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, target, member.getName(), "Ljava/lang/Object;");
        mv.visitVarInsn(ALOAD, 2);
        mv.visitFieldInsn(GETFIELD, target, member.getName(), "Ljava/lang/Object;");
        mv.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "equals",
                "(Ljava/lang/Object;Ljava/lang/Object;)Z", false);
        mv.visitJumpInsn(IFEQ, attrNotEqual);
    }
    mv.visitInsn(ICONST_1);
    mv.visitJumpInsn(GOTO, allAttrsEquals);
    mv.visitLabel(attrNotEqual);
    mv.visitInsn(ICONST_0);
    mv.visitLabel(allAttrsEquals);
    mv.visitInsn(IRETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

---

From source file:org.eclipse.golo.compiler.JavaBytecodeUtils.java

License:Open Source License

static Label visitLine(GoloElement<?> element, MethodVisitor visitor) {
    Label label = new Label();
    visitor.visitLabel(label);
    if (element.hasPosition()) {
        visitor.visitLineNumber(element.positionInSourceCode().getStartLine(), label);
    }/*from  w ww  .  j a v a2s  .  c  o m*/
    return label;
}

---

From source file:org.eclipse.m2m.atl.emftvm.jit.CodeBlockJIT.java

License:Open Source License

/**
 * Generates a constructor for the {@link JITCodeBlock}.
 * @param init the constructor visitor/*from w  w  w  .ja  v a  2s  .  c  o m*/
 * @param className the name of the generated class
 */
protected static void generateConstructor(final MethodVisitor init, final String className) {
    init.visitCode();
    // Generate labels
    final Label start = new Label();
    final Label end = new Label();
    // Generate bytecode
    init.visitLabel(start);
    init.visitVarInsn(ALOAD, 0); // this
    init.visitVarInsn(ALOAD, 1); // cb
    init.visitMethodInsn(INVOKESPECIAL, // super(cb) 
            Type.getInternalName(JITCodeBlock.class), "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(CodeBlock.class) }));
    init.visitInsn(RETURN);
    init.visitLabel(end);
    // Create local variable table
    init.visitLocalVariable("this", "L" + className + ";", null, start, end, 0);
    init.visitLocalVariable("cb", Type.getDescriptor(CodeBlock.class), null, start, end, 1);
    // Finalise
    init.visitMaxs(2, 2);
    init.visitEnd();
}

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