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

Example 16 with BadBytecode

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

the class NewArray method replace2.

private void replace2(String statement) throws CompileError, NotFoundException, BadBytecode, CannotCompileException {
    // to call checkModify().
    thisClass.getClassFile();
    ConstPool constPool = getConstPool();
    int pos = currentPos;
    CtClass retType;
    int codeLength;
    int index = 0;
    int dim = 1;
    String desc;
    if (opcode == Opcode.NEWARRAY) {
        // atype
        index = iterator.byteAt(currentPos + 1);
        CtPrimitiveType cpt = (CtPrimitiveType) getPrimitiveType(index);
        desc = "[" + cpt.getDescriptor();
        codeLength = 2;
    } else if (opcode == Opcode.ANEWARRAY) {
        index = iterator.u16bitAt(pos + 1);
        desc = constPool.getClassInfo(index);
        if (desc.startsWith("["))
            desc = "[" + desc;
        else
            desc = "[L" + desc + ";";
        codeLength = 3;
    } else if (opcode == Opcode.MULTIANEWARRAY) {
        index = iterator.u16bitAt(currentPos + 1);
        desc = constPool.getClassInfo(index);
        dim = iterator.byteAt(currentPos + 3);
        codeLength = 4;
    } else
        throw new RuntimeException("bad opcode: " + opcode);
    retType = Descriptor.toCtClass(desc, thisClass.getClassPool());
    Javac jc = new Javac(thisClass);
    CodeAttribute ca = iterator.get();
    CtClass[] params = new CtClass[dim];
    for (int i = 0; i < dim; ++i) params[i] = CtClass.intType;
    int paramVar = ca.getMaxLocals();
    jc.recordParams(javaLangObject, params, true, paramVar, withinStatic());
    /* Is $_ included in the source code?
         */
    checkResultValue(retType, statement);
    int retVar = jc.recordReturnType(retType, true);
    jc.recordProceed(new ProceedForArray(retType, opcode, index, dim));
    Bytecode bytecode = jc.getBytecode();
    storeStack(params, true, paramVar, bytecode);
    jc.recordLocalVariables(ca, pos);
    // initialize $_
    bytecode.addOpcode(ACONST_NULL);
    bytecode.addAstore(retVar);
    jc.compileStmnt(statement);
    bytecode.addAload(retVar);
    replace0(pos, bytecode, codeLength);
}

Example 17 with BadBytecode

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

the class ExprEditor method doit.

/**
 * Undocumented method.  Do not use; internal-use only.
 */
public boolean doit(CtClass clazz, MethodInfo minfo) throws CannotCompileException {
    CodeAttribute codeAttr = minfo.getCodeAttribute();
    if (codeAttr == null)
        return false;
    CodeIterator iterator = codeAttr.iterator();
    boolean edited = false;
    LoopContext context = new LoopContext(codeAttr.getMaxLocals());
    while (iterator.hasNext()) if (loopBody(iterator, clazz, minfo, context))
        edited = true;
    ExceptionTable et = codeAttr.getExceptionTable();
    int n = et.size();
    for (int i = 0; i < n; ++i) {
        Handler h = new Handler(et, i, iterator, clazz, minfo);
        edit(h);
        if (h.edited()) {
            edited = true;
            context.updateMax(h.locals(), h.stack());
        }
    }
    // so I check the current value of max-locals.
    if (codeAttr.getMaxLocals() < context.maxLocals)
        codeAttr.setMaxLocals(context.maxLocals);
    codeAttr.setMaxStack(codeAttr.getMaxStack() + context.maxStack);
    try {
        if (edited)
            minfo.rebuildStackMapIf6(clazz.getClassPool(), clazz.getClassFile2());
    } catch (BadBytecode b) {
        throw new CannotCompileException(b.getMessage(), b);
    }
    return edited;
}

Example 18 with BadBytecode

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

the class NewExpr method replace.

/**
 * Replaces the <code>new</code> expression with the bytecode derived from
 * the given source text.
 *
 * <p>$0 is available but the value is null.
 *
 * @param statement         a Java statement except try-catch.
 */
@Override
public void replace(String statement) throws CannotCompileException {
    // to call checkModify().
    thisClass.getClassFile();
    final int bytecodeSize = 3;
    int pos = newPos;
    int newIndex = iterator.u16bitAt(pos + 1);
    /* delete the preceding NEW and DUP (or DUP_X1, SWAP) instructions.
         */
    int codeSize = canReplace();
    int end = pos + codeSize;
    for (int i = pos; i < end; ++i) iterator.writeByte(NOP, i);
    ConstPool constPool = getConstPool();
    pos = currentPos;
    // constructor
    int methodIndex = iterator.u16bitAt(pos + 1);
    String signature = constPool.getMethodrefType(methodIndex);
    Javac jc = new Javac(thisClass);
    ClassPool cp = thisClass.getClassPool();
    CodeAttribute ca = iterator.get();
    try {
        CtClass[] params = Descriptor.getParameterTypes(signature, cp);
        CtClass newType = cp.get(newTypeName);
        int paramVar = ca.getMaxLocals();
        jc.recordParams(newTypeName, params, true, paramVar, withinStatic());
        int retVar = jc.recordReturnType(newType, true);
        jc.recordProceed(new ProceedForNew(newType, newIndex, methodIndex));
        /* Is $_ included in the source code?
             */
        checkResultValue(newType, statement);
        Bytecode bytecode = jc.getBytecode();
        storeStack(params, true, paramVar, bytecode);
        jc.recordLocalVariables(ca, pos);
        bytecode.addConstZero(newType);
        // initialize $_
        bytecode.addStore(retVar, newType);
        jc.compileStmnt(statement);
        if (// if the original code includes DUP.
        codeSize > 3)
            bytecode.addAload(retVar);
        replace0(pos, bytecode, bytecodeSize);
    } catch (CompileError e) {
        throw new CannotCompileException(e);
    } catch (NotFoundException e) {
        throw new CannotCompileException(e);
    } catch (BadBytecode e) {
        throw new CannotCompileException("broken method");
    }
}

Example 19 with BadBytecode

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

the class Cast method replace.

/**
 * Replaces the explicit cast operator with the bytecode derived from
 * the given source text.
 *
 * <p>$0 is available but the value is <code>null</code>.
 *
 * @param statement         a Java statement except try-catch.
 */
@Override
public void replace(String statement) throws CannotCompileException {
    // to call checkModify().
    thisClass.getClassFile();
    @SuppressWarnings("unused") ConstPool constPool = getConstPool();
    int pos = currentPos;
    int index = iterator.u16bitAt(pos + 1);
    Javac jc = new Javac(thisClass);
    ClassPool cp = thisClass.getClassPool();
    CodeAttribute ca = iterator.get();
    try {
        CtClass[] params = new CtClass[] { cp.get(javaLangObject) };
        CtClass retType = getType();
        int paramVar = ca.getMaxLocals();
        jc.recordParams(javaLangObject, params, true, paramVar, withinStatic());
        int retVar = jc.recordReturnType(retType, true);
        jc.recordProceed(new ProceedForCast(index, retType));
        /* Is $_ included in the source code?
             */
        checkResultValue(retType, statement);
        Bytecode bytecode = jc.getBytecode();
        storeStack(params, true, paramVar, bytecode);
        jc.recordLocalVariables(ca, pos);
        bytecode.addConstZero(retType);
        // initialize $_
        bytecode.addStore(retVar, retType);
        jc.compileStmnt(statement);
        bytecode.addLoad(retVar, retType);
        replace0(pos, bytecode, 3);
    } catch (CompileError e) {
        throw new CannotCompileException(e);
    } catch (NotFoundException e) {
        throw new CannotCompileException(e);
    } catch (BadBytecode e) {
        throw new CannotCompileException("broken method");
    }
}

Example 20 with BadBytecode

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

the class Javac method compile.

/**
 * Compiles a method, constructor, or field declaration
 * to a class.
 * A field declaration can declare only one field.
 *
 * <p>In a method or constructor body, $0, $1, ... and $_
 * are not available.
 *
 * @return          a <code>CtMethod</code>, <code>CtConstructor</code>,
 *                  or <code>CtField</code> object.
 * @see #recordProceed(String,String)
 */
public CtMember compile(String src) throws CompileError {
    Parser p = new Parser(new Lex(src));
    ASTList mem = p.parseMember1(stable);
    try {
        if (mem instanceof FieldDecl)
            return compileField((FieldDecl) mem);
        CtBehavior cb = compileMethod(p, (MethodDecl) mem);
        CtClass decl = cb.getDeclaringClass();
        cb.getMethodInfo2().rebuildStackMapIf6(decl.getClassPool(), decl.getClassFile2());
        return cb;
    } catch (BadBytecode bb) {
        throw new CompileError(bb.getMessage());
    } catch (CannotCompileException e) {
        throw new CompileError(e.getMessage());
    }
}