Examples of org.objectweb.asm.Label

org.objectweb.asm.Label
A label represents a position in the bytecode of a method. Labels are used for jump, goto, and switch instructions, and for try catch blocks. @author Eric Bruneton

    @Deprecated
    private MethodVisitor startCallFast(ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "call", FAST_CALL_SIG, null, null);
        
        mv.visitCode();
        Label line = new Label();
        mv.visitLineNumber(0, line);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, typePath);
        return mv;
    }

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    private MethodVisitor startDispatcher(ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "callMethod", sig(IRubyObject.class, params(ThreadContext.class, IRubyObject.class, RubyClass.class, Integer.TYPE, String.class,
                IRubyObject[].class, CallType.class, Block.class)), null, null);
        
        mv.visitCode();
        Label line = new Label();
        mv.visitLineNumber(0, line);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitTypeInsn(CHECKCAST, typePath);
        return mv;
    }

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    @Deprecated
    private MethodVisitor startCallSFast(ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "call", FAST_CALL_SIG, null, null);
        
        mv.visitCode();
        Label line = new Label();
        mv.visitLineNumber(0, line);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, IRUB);
        return mv;
    }

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    private SkinnyMethodAdapter startBlockCall(ClassWriter cw) {
        SkinnyMethodAdapter mv = new SkinnyMethodAdapter(cw.visitMethod(ACC_PUBLIC | ACC_SYNTHETIC | ACC_FINAL, "call", BLOCK_CALL_SIG, null, null));
        
        mv.visitCode();
        Label line = new Label();
        mv.visitLineNumber(0, line);
        return mv;
    }

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        // retrieve method
        mv.aload(DISPATCHER_RUBYMODULE_INDEX); // module
        mv.aload(DISPATCHER_NAME_INDEX); // name
        mv.invokevirtual(p(RubyModule.class), "searchMethod", sig(DynamicMethod.class, params(String.class)));


        Label okCall = new Label();
        
        callMethodMissingIfNecessary(mv, afterCall, okCall);


        // call is ok, punch it!
        mv.label(okCall);

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                params(ThreadContext.class, IRubyObject.class, RubyModule.class, String.class, IRubyObject[].class, Block.class)));
    }
    
    @Deprecated
    public void callMethodMissingIfNecessary(SkinnyMethodAdapter mv, Label afterCall, Label okCall) {
        Label methodMissing = new Label();


        // if undefined, branch to method_missing
        mv.dup();
        mv.invokevirtual(p(DynamicMethod.class), "isUndefined", sig(boolean.class));
        mv.ifne(methodMissing);

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    }


    @Deprecated
    private void checkArity(SkinnyMethodAdapter mv, Arity arity) {
        if (arity.getValue() >= 0) {
            Label arityOk = new Label();
            // check arity
            mv.aload(6);
            mv.arraylength();
            
            // load arity for check

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        methodCompiler.invokeUtilityMethod("doAttrAsgn", signature);
    }


    public void invokeAttrAssign(String name, CompilerCallback receiverCallback, ArgumentsCallback argsCallback) {
        Label variableCallType = new Label();
        Label readyForCall = new Label();
        
        // receiver first, so we know which call site to use
        receiverCallback.call(methodCompiler);
        
        // select appropriate call site

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        }
        
        // check if it's true, ending if so
        method.dup();
        methodCompiler.invokeIRubyObject("isTrue", sig(boolean.class));
        Label done = new Label();
        method.ifne(done);
        
        // not true, eval value and assign
        method.pop();
        // thread context, receiver and original args

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        }
        
        // check if it's true, ending if not
        method.dup();
        methodCompiler.invokeIRubyObject("isTrue", sig(boolean.class));
        Label done = new Label();
        method.ifeq(done);
        
        // not true, eval value and assign
        method.pop();
        // thread context, receiver and original args

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