com.sun.org.apache.bcel.internal.generic.ClassGen Java Examples
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com.sun.org.apache.bcel.internal.generic.ClassGen.
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Example #1
Source File: Bug8003147Test.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
@Test public void test() throws Exception { // Note: com.sun.org.apache.bcel.internal.classfile.JavaClass doesn't // support InvokeDynamic, so can't use lambda, also can't use string1 + // string2, because javac will generate a dynamic call where invoking // string1.concat(string2), so create a separate Bug8003147TestClass JAXPTestUtilities.tryRunWithTmpPermission(() -> { String classfile = getSystemProperty("test.classes") + "/parsers/Bug8003147TestClass.class"; JavaClass jc = new ClassParser(classfile).parse(); // rename class ConstantPool cp = jc.getConstantPool(); int cpIndex = ((ConstantClass) cp.getConstant(jc.getClassNameIndex())).getNameIndex(); cp.setConstant(cpIndex, new ConstantUtf8("parsers/Bug8003147TestClassPrime")); ClassGen gen = new ClassGen(jc); Method[] methods = jc.getMethods(); int index; for (index = 0; index < methods.length; index++) { if (methods[index].getName().equals("doSomething")) { break; } } Method m = methods[index]; MethodGen mg = new MethodGen(m, gen.getClassName(), gen.getConstantPool()); gen.replaceMethod(m, mg.getMethod()); String path = classfile.replace("Bug8003147TestClass", "Bug8003147TestClassPrime"); gen.getJavaClass().dump(new FileOutputStream(path)); try { Class.forName("parsers.Bug8003147TestClassPrime"); } catch (ClassFormatError cfe) { cfe.printStackTrace(); Assert.fail("modified version of class does not pass verification"); } }, new FilePermission(getSystemProperty("test.classes") + "/-", "read,write")); }