Examples of org.objectweb.asm.MethodVisitor.visitFieldInsn()

org.objectweb.asm.MethodVisitor.visitFieldInsn()
Visits a field instruction. A field instruction is an instruction that loads or stores the value of a field of an object. @param opcode the opcode of the type instruction to be visited. Thisopcode is either GETSTATIC, PUTSTATIC, GETFIELD or PUTFIELD. @param owner the internal name of the field's owner class (see {@link Type#getInternalName() getInternalName}). @param name the field's name. @param desc the field's descriptor (see {@link Type Type}).

    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(opcodes.tLOAD(), 1);
    mv.visitFieldInsn(PUTFIELD, meta.type.getInternalName(), f.name, f.desc);
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitInsn(RETURN);
    Label l2 = new Label();
    mv.visitLabel(l2);

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    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, f.name, "()" + f.desc, null, null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, meta.type.getInternalName(), f.name, f.desc);
    mv.visitInsn(opcodes.tRETURN());
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable("this", meta.type.getDescriptor(), null, l0, l1, 0);
    mv.visitEnd();

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  private void injectDispose(String owner) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "free", "(Lcom/artemis/World;)V", null, null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitFieldInsn(GETSTATIC, owner, "$store", "Ljava/util/Map;");
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "remove", "(Ljava/lang/Object;)Ljava/lang/Object;");
    mv.visitInsn(POP);
    Label l1 = new Label();
    mv.visitLabel(l1);

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    mv.visitInsn(ICONST_0);
    mv.visitVarInsn(ISTORE, 3);
    Label l2 = new Label();
    mv.visitLabel(l2);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, owner, "$data", "Ljava/nio/ByteBuffer;");
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/nio/ByteBuffer", "capacity", "()I");
    mv.visitVarInsn(ISTORE, 4);
    Label l3 = new Label();
    mv.visitLabel(l3);
    Label l4 = new Label();

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    mv.visitLabel(l5);
    mv.visitFrame(Opcodes.F_APPEND,3, new Object[] {"java/nio/ByteBuffer", Opcodes.INTEGER, Opcodes.INTEGER}, 0, null);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitVarInsn(ILOAD, 3);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, owner, "$data", "Ljava/nio/ByteBuffer;");
    mv.visitVarInsn(ILOAD, 3);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/nio/ByteBuffer", "get", "(I)B");
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/nio/ByteBuffer", "put", "(IB)Ljava/nio/ByteBuffer;");
    mv.visitInsn(POP);
    Label l6 = new Label();

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    mv.visitVarInsn(ILOAD, 4);
    mv.visitVarInsn(ILOAD, 3);
    mv.visitJumpInsn(IF_ICMPGT, l5);
    Label l7 = new Label();
    mv.visitLabel(l7);
    mv.visitFieldInsn(GETSTATIC, owner, "$store", "Ljava/util/Map;");
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, owner, "$world", "Lcom/artemis/World;");
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get", "(Ljava/lang/Object;)Ljava/lang/Object;");
    mv.visitTypeInsn(CHECKCAST, "com/artemis/utils/Bag");
    mv.visitMethodInsn(INVOKEVIRTUAL, "com/artemis/utils/Bag", "iterator", "()Ljava/util/Iterator;");

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    mv.visitJumpInsn(IF_ICMPGT, l5);
    Label l7 = new Label();
    mv.visitLabel(l7);
    mv.visitFieldInsn(GETSTATIC, owner, "$store", "Ljava/util/Map;");
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, owner, "$world", "Lcom/artemis/World;");
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get", "(Ljava/lang/Object;)Ljava/lang/Object;");
    mv.visitTypeInsn(CHECKCAST, "com/artemis/utils/Bag");
    mv.visitMethodInsn(INVOKEVIRTUAL, "com/artemis/utils/Bag", "iterator", "()Ljava/util/Iterator;");
    mv.visitVarInsn(ASTORE, 4);
    Label l8 = new Label();

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    mv.visitVarInsn(ASTORE, 3);
    Label l10 = new Label();
    mv.visitLabel(l10);
    mv.visitVarInsn(ALOAD, 3);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitFieldInsn(PUTFIELD, owner, "$data", "Ljava/nio/ByteBuffer;");
    mv.visitLabel(l8);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ALOAD, 4);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Iterator", "hasNext", "()Z");
    mv.visitJumpInsn(IFNE, l9);

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    mv.visitInsn(Opcodes.DUP);
    mv.visitInsn(Opcodes.DUP);
    mv.visitInsn(Opcodes.DUP);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitFieldInsn(Opcodes.PUTFIELD, name, names[0], "Lnet/minecraft/world/storage/ISaveHandler;");
    mv.visitTypeInsn(Opcodes.NEW, "net/minecraft/world/storage/WorldInfo");
    mv.visitInsn(Opcodes.DUP);
    mv.visitVarInsn(Opcodes.ALOAD, 4);
    mv.visitVarInsn(Opcodes.ALOAD, 2);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "net/minecraft/world/storage/WorldInfo", "<init>", "(Lnet/minecraft/world/WorldSettings;Ljava/lang/String;)V");

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    mv.visitTypeInsn(Opcodes.NEW, "net/minecraft/world/storage/WorldInfo");
    mv.visitInsn(Opcodes.DUP);
    mv.visitVarInsn(Opcodes.ALOAD, 4);
    mv.visitVarInsn(Opcodes.ALOAD, 2);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "net/minecraft/world/storage/WorldInfo", "<init>", "(Lnet/minecraft/world/WorldSettings;Ljava/lang/String;)V");
    mv.visitFieldInsn(Opcodes.PUTFIELD, name, names[1], "Lnet/minecraft/world/storage/WorldInfo;");
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitFieldInsn(Opcodes.PUTFIELD, name, names[2], "Lnet/minecraft/world/WorldProvider;");
    mv.visitVarInsn(Opcodes.ALOAD, 5);
    mv.visitFieldInsn(Opcodes.PUTFIELD, name, names[3], "Lnet/minecraft/profiler/Profiler;");
    mv.visitVarInsn(Opcodes.ALOAD, 6);

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