Examples of javassist.bytecode.analysis.Analyzer.analyze()

Class javassist.bytecode.analysis.Analyzer

Examples of javassist.bytecode.analysis.Analyzer.analyze()

javassist.bytecode.analysis.Analyzer.analyze()
Performs data-flow analysis on a method and returns an array, indexed by instruction position, containing the starting frame state of all reachable instructions. Non-reachable code, and illegal code offsets are represented as a null in the frame state array. This can be used to detect dead code. If the method does not contain code (it is either native or abstract), null is returned. @param clazz the declaring class of the method @param method the method to analyze @return an array, indexed by instruction position, of the starting frame state,or null if this method doesn't have code @throws BadBytecode if the bytecode does not comply with the JVM specification

        System.out.println("START: " + methodName);
        Analyzer analyzer = new Analyzer();


        long time = System.currentTimeMillis();
        try {
            analyzer.analyze(clazz, method.getMethodInfo2());
            System.out.println("SUCCESS: " + methodName + " - " + (System.currentTimeMillis() - time));
        } catch (Exception e) {
            System.out.println("FAIL: " + methodName + " - " + (e.getMessage() == null ? e.getClass().getName() : e.getMessage()));
        }
    }

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        CtMethod method = ClassPool.getDefault().getMethod(
                getClass().getName() + "$Dummy", "reusedLocalMerge");


        MethodInfo info = method.getMethodInfo2();
        Analyzer analyzer = new Analyzer();
        Frame[] frames = analyzer.analyze(method.getDeclaringClass(), info);
        assertNotNull(frames);
        int pos = findOpcode(info, Opcode.RETURN);
        Frame frame = frames[pos];
        assertEquals("java.lang.Object", frame.getLocal(2).getCtClass().getName());
    }

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            if (iter.byteAt(pos) == Opcode.ARETURN)
                break;
        }


        Analyzer analyzer = new Analyzer();
        Frame[] frames = analyzer.analyze(method.getDeclaringClass(), info);
        assertNotNull(frames);
        Frame frame = frames[pos];
        assertEquals(expected, frame.peek().getCtClass().getName());
    }

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            if (iter.byteAt(pos) == Opcode.AALOAD)
                break;
        }


        Analyzer analyzer = new Analyzer();
        Frame[] frames = analyzer.analyze(clazz, info);
        assertNotNull(frames);
        Frame frame = frames[pos];
        assertNotNull(frame);


        Type type = frame.getStack(frame.getTopIndex() - 1);

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    }


    public void testDeadCode() throws Exception {
        CtMethod method = generateDeadCode(ClassPool.getDefault());
        Analyzer analyzer = new Analyzer();
        Frame[] frames = analyzer.analyze(method.getDeclaringClass(), method.getMethodInfo2());
        assertNotNull(frames);
        assertNull(frames[4]);
        assertNotNull(frames[5]);
        verifyReturn(method, "java.lang.String");
    }

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    public void testInvalidCode() throws Exception {
        CtMethod method = generateInvalidCode(ClassPool.getDefault());
        Analyzer analyzer = new Analyzer();
        try {
            analyzer.analyze(method.getDeclaringClass(), method.getMethodInfo2());
        } catch (BadBytecode e) {
            return;
        }


        fail("Invalid code should have triggered a BadBytecode exception");

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    public void testCodeFalloff() throws Exception {
        CtMethod method = generateCodeFalloff(ClassPool.getDefault());
        Analyzer analyzer = new Analyzer();
        try {
            analyzer.analyze(method.getDeclaringClass(), method.getMethodInfo2());
        } catch (BadBytecode e) {
            return;
        }


        fail("Code falloff should have triggered a BadBytecode exception");

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    }


    public void testJsrMerge() throws Exception {
        CtMethod method = generateJsrMerge(ClassPool.getDefault());
        Analyzer analyzer = new Analyzer();
        analyzer.analyze(method.getDeclaringClass(), method.getMethodInfo2());
        verifyReturn(method, "java.lang.String");
    }


    public void testJsrMerge2() throws Exception {
        CtMethod method = generateJsrMerge2(ClassPool.getDefault());

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    }


    public void testJsrMerge2() throws Exception {
        CtMethod method = generateJsrMerge2(ClassPool.getDefault());
        Analyzer analyzer = new Analyzer();
        analyzer.analyze(method.getDeclaringClass(), method.getMethodInfo2());
        verifyReturn(method, "java.lang.String");
    }


    private CtMethod generateDeadCode(ClassPool pool) throws Exception {
        CtClass clazz = pool.makeClass(getClass().getName() + "$Generated0");

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