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

        }
        
        // 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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        methodCompiler.loadSelf();
        methodCompiler.getScriptCompiler().getCacheCompiler().cacheCallSite(methodCompiler, attrName, CallType.FUNCTIONAL);
        
        methodCompiler.invokeUtilityMethod("preOpAsgnWithOrAnd", sig(IRubyObject.class, IRubyObject.class, ThreadContext.class, IRubyObject.class, CallSite.class));
        
        Label done = new Label();
        Label isTrue = new Label();
        
        method.dup();
        methodCompiler.invokeIRubyObject("isTrue", sig(boolean.class));
        method.ifne(isTrue);

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        methodCompiler.loadSelf();
        methodCompiler.getScriptCompiler().getCacheCompiler().cacheCallSite(methodCompiler, attrName, CallType.FUNCTIONAL);
        
        methodCompiler.invokeUtilityMethod("preOpAsgnWithOrAnd", sig(IRubyObject.class, IRubyObject.class, ThreadContext.class, IRubyObject.class, CallSite.class));
        
        Label done = new Label();
        Label isFalse = new Label();
        
        method.dup();
        methodCompiler.invokeIRubyObject("isTrue", sig(boolean.class));
        method.ifeq(isFalse);

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                            sig(BlockBody.class, ThreadContext.class), null, null));


            closureGetter.aload(0);
            closureGetter.getfield(scriptCompiler.getClassname(), closureFieldName, ci(BlockBody.class));
            closureGetter.dup();
            Label alreadyCreated = new Label();
            closureGetter.ifnonnull(alreadyCreated);


            // no callback, construct and cache it
            closureGetter.pop();
            closureGetter.aload(0); // [this]

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                            sig(CompiledBlockCallback.class, Ruby.class), null, null));


            closureGetter.aload(0);
            closureGetter.getfield(scriptCompiler.getClassname(), closureFieldName, ci(CompiledBlockCallback.class));
            closureGetter.dup();
            Label alreadyCreated = new Label();
            closureGetter.ifnonnull(alreadyCreated);


            // no callback, construct and cache it
            closureGetter.pop();
            closureGetter.aload(0); // [this]

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    @Override
    public void endBody() {
        // return last value from execution
        method.areturn();
        Label end = new Label();
        method.label(end);


        method.end();
    }

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        method.invokestatic(p(RuntimeHelpers.class), "getBackref", sig(IRubyObject.class, Ruby.class, ThreadContext.class));
    }


    public void checkMethodArity(int requiredArgs, int optArgs, int restArg) {
        // check arity
        Label arityError = new Label();
        Label noArityError = new Label();


        if (specificArity) {
            // do nothing; arity check is done before call
            // FIXME: arity check is not yet done before call :)
        } else {

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                                   String arg3) {
        getMethodVisitor().visitTryCatchBlock(arg0, arg1, arg2, arg3);
    }
    
    public void trycatch(String type, Runnable body, Runnable catchBody) {
        Label before = new Label();
        Label after = new Label();
        Label catchStart = new Label();
        Label done = new Label();


        trycatch(before, after, catchStart, type);
        label(before);
        body.run();
        label(after);

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        // grab nil for local variables
        invokeIRuby("getNil", sig(IRubyObject.class));
        method.astore(getNilIndex());


        variableCompiler.beginClosure(args, scope);
        redoJump = new Label();
        method.label(scopeStart);
    }

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