Examples with BadBytecode javassist.bytecode.BadBytecode used on opensource projects

Example 6 with BadBytecode

use of javassist.bytecode.BadBytecode in project javassist by jboss-javassist.

the class FieldInitLink method modifyClassConstructor.

private void modifyClassConstructor(ClassFile cf, Bytecode code, int stacksize, int localsize) throws CannotCompileException {
    MethodInfo m = cf.getStaticInitializer();
    if (m == null) {
        code.add(Bytecode.RETURN);
        code.setMaxStack(stacksize);
        code.setMaxLocals(localsize);
        m = new MethodInfo(cf.getConstPool(), "<clinit>", "()V");
        m.setAccessFlags(AccessFlag.STATIC);
        m.setCodeAttribute(code.toCodeAttribute());
        cf.addMethod(m);
        CtMember.Cache cache = hasMemberCache();
        if (cache != null)
            cache.addConstructor(new CtConstructor(m, this));
    } else {
        CodeAttribute codeAttr = m.getCodeAttribute();
        if (codeAttr == null)
            throw new CannotCompileException("empty <clinit>");
        try {
            CodeIterator it = codeAttr.iterator();
            int pos = it.insertEx(code.get());
            it.insert(code.getExceptionTable(), pos);
            int maxstack = codeAttr.getMaxStack();
            if (maxstack < stacksize)
                codeAttr.setMaxStack(stacksize);
            int maxlocals = codeAttr.getMaxLocals();
            if (maxlocals < localsize)
                codeAttr.setMaxLocals(localsize);
        } catch (BadBytecode e) {
            throw new CannotCompileException(e);
        }
    }
    try {
        m.rebuildStackMapIf6(classPool, cf);
    } catch (BadBytecode e) {
        throw new CannotCompileException(e);
    }
}

Example 7 with BadBytecode

use of javassist.bytecode.BadBytecode in project javassist by jboss-javassist.

the class FieldInitLink method modifyConstructors.

private void modifyConstructors(ClassFile cf) throws CannotCompileException, NotFoundException {
    if (fieldInitializers == null)
        return;
    ConstPool cp = cf.getConstPool();
    List<MethodInfo> methods = cf.getMethods();
    for (MethodInfo minfo : methods) {
        if (minfo.isConstructor()) {
            CodeAttribute codeAttr = minfo.getCodeAttribute();
            if (codeAttr != null)
                try {
                    Bytecode init = new Bytecode(cp, 0, codeAttr.getMaxLocals());
                    CtClass[] params = Descriptor.getParameterTypes(minfo.getDescriptor(), classPool);
                    int stacksize = makeFieldInitializer(init, params);
                    insertAuxInitializer(codeAttr, init, stacksize);
                    minfo.rebuildStackMapIf6(classPool, cf);
                } catch (BadBytecode e) {
                    throw new CannotCompileException(e);
                }
        }
    }
}

Example 8 with BadBytecode

use of javassist.bytecode.BadBytecode in project javassist by jboss-javassist.

the class CtConstructor method insertBeforeBody.

/**
 * Inserts bytecode just after another constructor in the super class
 * or this class is called.
 * It does not work if this object represents a class initializer.
 *
 * @param src       the source code representing the inserted bytecode.
 *                  It must be a single statement or block.
 */
public void insertBeforeBody(String src) throws CannotCompileException {
    CtClass cc = declaringClass;
    cc.checkModify();
    if (isClassInitializer())
        throw new CannotCompileException("class initializer");
    CodeAttribute ca = methodInfo.getCodeAttribute();
    CodeIterator iterator = ca.iterator();
    Bytecode b = new Bytecode(methodInfo.getConstPool(), ca.getMaxStack(), ca.getMaxLocals());
    b.setStackDepth(ca.getMaxStack());
    Javac jv = new Javac(b, cc);
    try {
        jv.recordParams(getParameterTypes(), false);
        jv.compileStmnt(src);
        ca.setMaxStack(b.getMaxStack());
        ca.setMaxLocals(b.getMaxLocals());
        iterator.skipConstructor();
        int pos = iterator.insertEx(b.get());
        iterator.insert(b.getExceptionTable(), pos);
        methodInfo.rebuildStackMapIf6(cc.getClassPool(), cc.getClassFile2());
    } catch (NotFoundException e) {
        throw new CannotCompileException(e);
    } catch (CompileError e) {
        throw new CannotCompileException(e);
    } catch (BadBytecode e) {
        throw new CannotCompileException(e);
    }
}

Example 9 with BadBytecode

use of javassist.bytecode.BadBytecode in project javassist by jboss-javassist.

the class CtBehavior method setBody.

/**
 * Sets a method/constructor body.
 *
 * @param src       the source code representing the body.
 *                  It must be a single statement or block.
 *                  If it is <code>null</code>, the substituted
 *                  body does nothing except returning zero or null.
 * @param delegateObj       the source text specifying the object
 *                          that is called on by <code>$proceed()</code>.
 * @param delegateMethod    the name of the method
 *                          that is called by <code>$proceed()</code>.
 */
public void setBody(String src, String delegateObj, String delegateMethod) throws CannotCompileException {
    CtClass cc = declaringClass;
    cc.checkModify();
    try {
        Javac jv = new Javac(cc);
        if (delegateMethod != null)
            jv.recordProceed(delegateObj, delegateMethod);
        Bytecode b = jv.compileBody(this, src);
        methodInfo.setCodeAttribute(b.toCodeAttribute());
        methodInfo.setAccessFlags(methodInfo.getAccessFlags() & ~AccessFlag.ABSTRACT);
        methodInfo.rebuildStackMapIf6(cc.getClassPool(), cc.getClassFile2());
        declaringClass.rebuildClassFile();
    } catch (CompileError e) {
        throw new CannotCompileException(e);
    } catch (BadBytecode e) {
        throw new CannotCompileException(e);
    }
}

Example 10 with BadBytecode

use of javassist.bytecode.BadBytecode in project javassist by jboss-javassist.

the class CtBehavior method insertBefore.

private void insertBefore(String src, boolean rebuild) throws CannotCompileException {
    CtClass cc = declaringClass;
    cc.checkModify();
    CodeAttribute ca = methodInfo.getCodeAttribute();
    if (ca == null)
        throw new CannotCompileException("no method body");
    CodeIterator iterator = ca.iterator();
    Javac jv = new Javac(cc);
    try {
        int nvars = jv.recordParams(getParameterTypes(), Modifier.isStatic(getModifiers()));
        jv.recordParamNames(ca, nvars);
        jv.recordLocalVariables(ca, 0);
        jv.recordReturnType(getReturnType0(), false);
        jv.compileStmnt(src);
        Bytecode b = jv.getBytecode();
        int stack = b.getMaxStack();
        int locals = b.getMaxLocals();
        if (stack > ca.getMaxStack())
            ca.setMaxStack(stack);
        if (locals > ca.getMaxLocals())
            ca.setMaxLocals(locals);
        int pos = iterator.insertEx(b.get());
        iterator.insert(b.getExceptionTable(), pos);
        if (rebuild)
            methodInfo.rebuildStackMapIf6(cc.getClassPool(), cc.getClassFile2());
    } catch (NotFoundException e) {
        throw new CannotCompileException(e);
    } catch (CompileError e) {
        throw new CannotCompileException(e);
    } catch (BadBytecode e) {
        throw new CannotCompileException(e);
    }
}