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


    public void undefMethod(String name) {
        loadThreadContext();
        invokeThreadContext("getRubyClass", sig(RubyModule.class));


        Label notNull = new Label();
        method.dup();
        method.ifnonnull(notNull);
        method.pop();
        loadRuntime();
        method.ldc("No class to undef method '" + name + "'.");

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                classBody.invokeThreadContext("preCompiledClass", sig(Void.TYPE, params(RubyModule.class, String[].class)));
            }
        };


        // Here starts the logic for the class definition
        Label start = new Label();
        Label end = new Label();
        Label after = new Label();
        Label noException = new Label();
        classBody.method.trycatch(start, end, after, null);


        classBody.beginMethod(bodyPrep, staticScope);


        classBody.method.label(start);

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                classBody.invokeThreadContext("preCompiledClass", sig(Void.TYPE, params(RubyModule.class, String[].class)));
            }
        };


        // Here starts the logic for the class definition
        Label start = new Label();
        Label end = new Label();
        Label after = new Label();
        Label noException = new Label();
        classBody.method.trycatch(start, end, after, null);


        classBody.beginMethod(bodyPrep, staticScope);


        classBody.method.label(start);

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        method.ldc("SystemExit");
        method.invokevirtual(p(Ruby.class), "fastGetClass", sig(RubyClass.class, String.class));
        method.swap();
        method.invokevirtual(p(RubyModule.class), "isInstance", sig(boolean.class, params(IRubyObject.class)));
        method.iconst_0();
        Label ifEnd = new Label();
        method.if_icmpeq(ifEnd);
        loadException();
        method.athrow();
        method.label(ifEnd);
    }

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        method.invokevirtual(p(RubyFixnum.class), "getLongValue", sig(long.class));
        method.l2i();


        Label[] labels = new Label[cases.length];
        for (int i = 0; i < labels.length; i++) {
            labels[i] = new Label();
        }
        Label defaultLabel = new Label();
        Label endLabel = new Label();


        method.lookupswitch(defaultLabel, cases, labels);
        for (int i = 0; i < cases.length; i++) {
            method.label(labels[i]);
            arrayCallback.nextValue(this, bodies, i);

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        defaultCallback.call(this);
        method.label(endLabel);
    }


    public void typeCheckBranch(Class type, BranchCallback trueCallback, BranchCallback falseCallback) {
        Label elseLabel = new Label();
        Label done = new Label();


        method.dup();
        method.instance_of(p(type));
        method.ifeq(elseLabel);

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        methodCompiler.loadThreadContext();
        methodCompiler.getScriptCompiler().getCacheCompiler().cacheCallSite(methodCompiler, attrName, CallType.FUNCTIONAL);
        
        methodCompiler.invokeUtilityMethod("preOpAsgnWithOrAnd", sig(IRubyObject.class, IRubyObject.class, ThreadContext.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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    @Override
    public void endBody() {
        // return last value from execution
        method.areturn();
        Label end = new Label();
        method.label(end);


        method.end();
    }

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            // the load method is used for loading as a top-level script, and prepares appropriate scoping around the code
            SkinnyMethodAdapter method = new SkinnyMethodAdapter(getClassVisitor().visitMethod(ACC_PUBLIC, "load", METHOD_SIGNATURES[4], null, null));
            method.start();


            // invoke __file__ with threadcontext, self, args (null), and block (null)
            Label tryBegin = new Label();
            Label tryFinally = new Label();


            method.label(tryBegin);
            method.aload(THREADCONTEXT_INDEX);
            buildStaticScopeNames(method, topLevelScope);
            method.invokestatic(p(RuntimeHelpers.class), "preLoad", sig(void.class, ThreadContext.class, String[].class));

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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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